staging: octeon-usb: merge cvmx-usb into octeon-hcd
authorAaro Koskinen <aaro.koskinen@iki.fi>
Sun, 6 Oct 2013 19:22:24 +0000 (22:22 +0300)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 7 Oct 2013 05:02:21 +0000 (22:02 -0700)
cvmx-usb module provided Cavium "OS abstraction layer" for USB
functionality. To make this driver a proper Linux driver, we need to
refactor this layer out. By making all the code internal to the HCD
driver makes this task easier.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/staging/octeon-usb/Makefile
drivers/staging/octeon-usb/cvmx-usb.c [deleted file]
drivers/staging/octeon-usb/cvmx-usb.h [deleted file]
drivers/staging/octeon-usb/octeon-hcd.c

index 89df1ad8be308bfc7376f5a919f64a0f52d6fa9b..5588be395f2a7a967192d7f8ea478085865809a7 100644 (file)
@@ -1,3 +1 @@
-obj-${CONFIG_OCTEON_USB} := octeon-usb.o
-octeon-usb-y := octeon-hcd.o
-octeon-usb-y += cvmx-usb.o
+obj-${CONFIG_OCTEON_USB} := octeon-hcd.o
diff --git a/drivers/staging/octeon-usb/cvmx-usb.c b/drivers/staging/octeon-usb/cvmx-usb.c
deleted file mode 100644 (file)
index 910a657..0000000
+++ /dev/null
@@ -1,3186 +0,0 @@
-/***********************license start***************
- * Copyright (c) 2003-2010  Cavium Networks (support@cavium.com). All rights
- * reserved.
- *
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *   * Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer.
- *
- *   * Redistributions in binary form must reproduce the above
- *     copyright notice, this list of conditions and the following
- *     disclaimer in the documentation and/or other materials provided
- *     with the distribution.
-
- *   * Neither the name of Cavium Networks nor the names of
- *     its contributors may be used to endorse or promote products
- *     derived from this software without specific prior written
- *     permission.
-
- * This Software, including technical data, may be subject to U.S. export
- * control laws, including the U.S. Export Administration Act and its associated
- * regulations, and may be subject to export or import  regulations in other
- * countries.
-
- * TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
- * AND WITH ALL FAULTS AND CAVIUM NETWORKS MAKES NO PROMISES, REPRESENTATIONS OR
- * WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT TO
- * THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY REPRESENTATION
- * OR DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT DEFECTS, AND CAVIUM
- * SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES OF TITLE,
- * MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR PURPOSE, LACK OF
- * VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET POSSESSION OR
- * CORRESPONDENCE TO DESCRIPTION. THE ENTIRE  RISK ARISING OUT OF USE OR
- * PERFORMANCE OF THE SOFTWARE LIES WITH YOU.
- ***********************license end**************************************/
-
-
-/**
- * @file
- *
- * "cvmx-usb.c" defines a set of low level USB functions to help
- * developers create Octeon USB drivers for various operating
- * systems. These functions provide a generic API to the Octeon
- * USB blocks, hiding the internal hardware specific
- * operations.
- */
-#include <linux/delay.h>
-#include <asm/octeon/cvmx.h>
-#include <asm/octeon/octeon.h>
-#include <asm/octeon/cvmx-sysinfo.h>
-#include "cvmx-usbnx-defs.h"
-#include "cvmx-usbcx-defs.h"
-#include "cvmx-usb.h"
-#include <asm/octeon/cvmx-helper.h>
-#include <asm/octeon/cvmx-helper-board.h>
-
-/* Normal prefetch that use the pref instruction. */
-#define CVMX_PREFETCH(address, offset) asm volatile ("pref %[type], %[off](%[rbase])" : : [rbase] "d" (address), [off] "I" (offset), [type] "n" (0))
-
-/* Maximum number of times to retry failed transactions */
-#define MAX_RETRIES            3
-
-/* Maximum number of pipes that can be open at once */
-#define MAX_PIPES              32
-
-/* Maximum number of outstanding transactions across all pipes */
-#define MAX_TRANSACTIONS       256
-
-/* Maximum number of hardware channels supported by the USB block */
-#define MAX_CHANNELS           8
-
-/* The highest valid USB device address */
-#define MAX_USB_ADDRESS                127
-
-/* The highest valid USB endpoint number */
-#define MAX_USB_ENDPOINT       15
-
-/* The highest valid port number on a hub */
-#define MAX_USB_HUB_PORT       15
-
-/*
- * The low level hardware can transfer a maximum of this number of bytes in each
- * transfer. The field is 19 bits wide
- */
-#define MAX_TRANSFER_BYTES     ((1<<19)-1)
-
-/*
- * The low level hardware can transfer a maximum of this number of packets in
- * each transfer. The field is 10 bits wide
- */
-#define MAX_TRANSFER_PACKETS   ((1<<10)-1)
-
-enum cvmx_usb_transaction_flags {
-       __CVMX_USB_TRANSACTION_FLAGS_IN_USE = 1<<16,
-};
-
-enum {
-       USB_CLOCK_TYPE_REF_12,
-       USB_CLOCK_TYPE_REF_24,
-       USB_CLOCK_TYPE_REF_48,
-       USB_CLOCK_TYPE_CRYSTAL_12,
-};
-
-/**
- * Logical transactions may take numerous low level
- * transactions, especially when splits are concerned. This
- * enum represents all of the possible stages a transaction can
- * be in. Note that split completes are always even. This is so
- * the NAK handler can backup to the previous low level
- * transaction with a simple clearing of bit 0.
- */
-enum cvmx_usb_stage {
-       CVMX_USB_STAGE_NON_CONTROL,
-       CVMX_USB_STAGE_NON_CONTROL_SPLIT_COMPLETE,
-       CVMX_USB_STAGE_SETUP,
-       CVMX_USB_STAGE_SETUP_SPLIT_COMPLETE,
-       CVMX_USB_STAGE_DATA,
-       CVMX_USB_STAGE_DATA_SPLIT_COMPLETE,
-       CVMX_USB_STAGE_STATUS,
-       CVMX_USB_STAGE_STATUS_SPLIT_COMPLETE,
-};
-
-/**
- * struct cvmx_usb_transaction - describes each pending USB transaction
- *                              regardless of type. These are linked together
- *                              to form a list of pending requests for a pipe.
- *
- * @prev:              Transaction before this one in the pipe.
- * @next:              Transaction after this one in the pipe.
- * @type:              Type of transaction, duplicated of the pipe.
- * @flags:             State flags for this transaction.
- * @buffer:            User's physical buffer address to read/write.
- * @buffer_length:     Size of the user's buffer in bytes.
- * @control_header:    For control transactions, physical address of the 8
- *                     byte standard header.
- * @iso_start_frame:   For ISO transactions, the starting frame number.
- * @iso_number_packets:        For ISO transactions, the number of packets in the
- *                     request.
- * @iso_packets:       For ISO transactions, the sub packets in the request.
- * @actual_bytes:      Actual bytes transfer for this transaction.
- * @stage:             For control transactions, the current stage.
- * @callback:          User's callback function when complete.
- * @callback_data:     User's data.
- */
-struct cvmx_usb_transaction {
-       struct cvmx_usb_transaction *prev;
-       struct cvmx_usb_transaction *next;
-       enum cvmx_usb_transfer type;
-       enum cvmx_usb_transaction_flags flags;
-       uint64_t buffer;
-       int buffer_length;
-       uint64_t control_header;
-       int iso_start_frame;
-       int iso_number_packets;
-       struct cvmx_usb_iso_packet *iso_packets;
-       int xfersize;
-       int pktcnt;
-       int retries;
-       int actual_bytes;
-       enum cvmx_usb_stage stage;
-       cvmx_usb_callback_func_t callback;
-       void *callback_data;
-};
-
-/**
- * struct cvmx_usb_pipe - a pipe represents a virtual connection between Octeon
- *                       and some USB device. It contains a list of pending
- *                       request to the device.
- *
- * @prev:              Pipe before this one in the list
- * @next:              Pipe after this one in the list
- * @head:              The first pending transaction
- * @tail:              The last pending transaction
- * @interval:          For periodic pipes, the interval between packets in
- *                     frames
- * @next_tx_frame:     The next frame this pipe is allowed to transmit on
- * @flags:             State flags for this pipe
- * @device_speed:      Speed of device connected to this pipe
- * @transfer_type:     Type of transaction supported by this pipe
- * @transfer_dir:      IN or OUT. Ignored for Control
- * @multi_count:       Max packet in a row for the device
- * @max_packet:                The device's maximum packet size in bytes
- * @device_addr:       USB device address at other end of pipe
- * @endpoint_num:      USB endpoint number at other end of pipe
- * @hub_device_addr:   Hub address this device is connected to
- * @hub_port:          Hub port this device is connected to
- * @pid_toggle:                This toggles between 0/1 on every packet send to track
- *                     the data pid needed
- * @channel:           Hardware DMA channel for this pipe
- * @split_sc_frame:    The low order bits of the frame number the split
- *                     complete should be sent on
- */
-struct cvmx_usb_pipe {
-       struct cvmx_usb_pipe *prev;
-       struct cvmx_usb_pipe *next;
-       struct cvmx_usb_transaction *head;
-       struct cvmx_usb_transaction *tail;
-       uint64_t interval;
-       uint64_t next_tx_frame;
-       enum cvmx_usb_pipe_flags flags;
-       enum cvmx_usb_speed device_speed;
-       enum cvmx_usb_transfer transfer_type;
-       enum cvmx_usb_direction transfer_dir;
-       int multi_count;
-       uint16_t max_packet;
-       uint8_t device_addr;
-       uint8_t endpoint_num;
-       uint8_t hub_device_addr;
-       uint8_t hub_port;
-       uint8_t pid_toggle;
-       uint8_t channel;
-       int8_t split_sc_frame;
-};
-
-/**
- * struct cvmx_usb_pipe_list
- *
- * @head: Head of the list, or NULL if empty.
- * @tail: Tail if the list, or NULL if empty.
- */
-struct cvmx_usb_pipe_list {
-       struct cvmx_usb_pipe *head;
-       struct cvmx_usb_pipe *tail;
-};
-
-struct cvmx_usb_tx_fifo {
-       struct {
-               int channel;
-               int size;
-               uint64_t address;
-       } entry[MAX_CHANNELS+1];
-       int head;
-       int tail;
-};
-
-/**
- * struct cvmx_usb_internal_state - the state of the USB block
- *
- * init_flags:            Flags passed to initialize.
- * index:                 Which USB block this is for.
- * idle_hardware_channels: Bit set for every idle hardware channel.
- * usbcx_hprt:            Stored port status so we don't need to read a CSR to
- *                        determine splits.
- * pipe_for_channel:      Map channels to pipes.
- * free_transaction_head:  List of free transactions head.
- * free_transaction_tail:  List of free transactions tail.
- * pipe:                  Storage for pipes.
- * transaction:                   Storage for transactions.
- * callback:              User global callbacks.
- * callback_data:         User data for each callback.
- * indent:                Used by debug output to indent functions.
- * port_status:                   Last port status used for change notification.
- * free_pipes:            List of all pipes that are currently closed.
- * idle_pipes:            List of open pipes that have no transactions.
- * active_pipes:          Active pipes indexed by transfer type.
- * frame_number:          Increments every SOF interrupt for time keeping.
- * active_split:          Points to the current active split, or NULL.
- */
-struct cvmx_usb_internal_state {
-       int init_flags;
-       int index;
-       int idle_hardware_channels;
-       union cvmx_usbcx_hprt usbcx_hprt;
-       struct cvmx_usb_pipe *pipe_for_channel[MAX_CHANNELS];
-       struct cvmx_usb_transaction *free_transaction_head;
-       struct cvmx_usb_transaction *free_transaction_tail;
-       struct cvmx_usb_pipe pipe[MAX_PIPES];
-       struct cvmx_usb_transaction transaction[MAX_TRANSACTIONS];
-       cvmx_usb_callback_func_t callback[__CVMX_USB_CALLBACK_END];
-       void *callback_data[__CVMX_USB_CALLBACK_END];
-       int indent;
-       struct cvmx_usb_port_status port_status;
-       struct cvmx_usb_pipe_list free_pipes;
-       struct cvmx_usb_pipe_list idle_pipes;
-       struct cvmx_usb_pipe_list active_pipes[4];
-       uint64_t frame_number;
-       struct cvmx_usb_transaction *active_split;
-       struct cvmx_usb_tx_fifo periodic;
-       struct cvmx_usb_tx_fifo nonperiodic;
-};
-
-/* This macro spins on a field waiting for it to reach a value */
-#define CVMX_WAIT_FOR_FIELD32(address, type, field, op, value, timeout_usec)\
-       ({int result;                                                       \
-       do {                                                                \
-               uint64_t done = cvmx_get_cycle() + (uint64_t)timeout_usec * \
-                       octeon_get_clock_rate() / 1000000;                  \
-               type c;                                                     \
-               while (1) {                                                 \
-                       c.u32 = __cvmx_usb_read_csr32(usb, address);        \
-                       if (c.s.field op (value)) {                         \
-                               result = 0;                                 \
-                               break;                                      \
-                       } else if (cvmx_get_cycle() > done) {               \
-                               result = -1;                                \
-                               break;                                      \
-                       } else                                              \
-                               cvmx_wait(100);                             \
-               }                                                           \
-       } while (0);                                                        \
-       result; })
-
-/*
- * This macro logically sets a single field in a CSR. It does the sequence
- * read, modify, and write
- */
-#define USB_SET_FIELD32(address, type, field, value)           \
-       do {                                                    \
-               type c;                                         \
-               c.u32 = __cvmx_usb_read_csr32(usb, address);    \
-               c.s.field = value;                              \
-               __cvmx_usb_write_csr32(usb, address, c.u32);    \
-       } while (0)
-
-/* Returns the IO address to push/pop stuff data from the FIFOs */
-#define USB_FIFO_ADDRESS(channel, usb_index) (CVMX_USBCX_GOTGCTL(usb_index) + ((channel)+1)*0x1000)
-
-static int octeon_usb_get_clock_type(void)
-{
-       switch (cvmx_sysinfo_get()->board_type) {
-       case CVMX_BOARD_TYPE_BBGW_REF:
-       case CVMX_BOARD_TYPE_LANAI2_A:
-       case CVMX_BOARD_TYPE_LANAI2_U:
-       case CVMX_BOARD_TYPE_LANAI2_G:
-       case CVMX_BOARD_TYPE_UBNT_E100:
-               return USB_CLOCK_TYPE_CRYSTAL_12;
-       }
-       return USB_CLOCK_TYPE_REF_48;
-}
-
-/**
- * Read a USB 32bit CSR. It performs the necessary address swizzle
- * for 32bit CSRs and logs the value in a readable format if
- * debugging is on.
- *
- * @usb:     USB block this access is for
- * @address: 64bit address to read
- *
- * Returns: Result of the read
- */
-static inline uint32_t __cvmx_usb_read_csr32(struct cvmx_usb_internal_state *usb,
-                                            uint64_t address)
-{
-       uint32_t result = cvmx_read64_uint32(address ^ 4);
-       return result;
-}
-
-
-/**
- * Write a USB 32bit CSR. It performs the necessary address
- * swizzle for 32bit CSRs and logs the value in a readable format
- * if debugging is on.
- *
- * @usb:     USB block this access is for
- * @address: 64bit address to write
- * @value:   Value to write
- */
-static inline void __cvmx_usb_write_csr32(struct cvmx_usb_internal_state *usb,
-                                         uint64_t address, uint32_t value)
-{
-       cvmx_write64_uint32(address ^ 4, value);
-       cvmx_read64_uint64(CVMX_USBNX_DMA0_INB_CHN0(usb->index));
-}
-
-
-/**
- * Read a USB 64bit CSR. It logs the value in a readable format if
- * debugging is on.
- *
- * @usb:     USB block this access is for
- * @address: 64bit address to read
- *
- * Returns: Result of the read
- */
-static inline uint64_t __cvmx_usb_read_csr64(struct cvmx_usb_internal_state *usb,
-                                            uint64_t address)
-{
-       uint64_t result = cvmx_read64_uint64(address);
-       return result;
-}
-
-
-/**
- * Write a USB 64bit CSR. It logs the value in a readable format
- * if debugging is on.
- *
- * @usb:     USB block this access is for
- * @address: 64bit address to write
- * @value:   Value to write
- */
-static inline void __cvmx_usb_write_csr64(struct cvmx_usb_internal_state *usb,
-                                         uint64_t address, uint64_t value)
-{
-       cvmx_write64_uint64(address, value);
-}
-
-/**
- * Return non zero if this pipe connects to a non HIGH speed
- * device through a high speed hub.
- *
- * @usb:    USB block this access is for
- * @pipe:   Pipe to check
- *
- * Returns: Non zero if we need to do split transactions
- */
-static inline int __cvmx_usb_pipe_needs_split(struct cvmx_usb_internal_state *usb, struct cvmx_usb_pipe *pipe)
-{
-       return ((pipe->device_speed != CVMX_USB_SPEED_HIGH) && (usb->usbcx_hprt.s.prtspd == CVMX_USB_SPEED_HIGH));
-}
-
-
-/**
- * Trivial utility function to return the correct PID for a pipe
- *
- * @pipe:   pipe to check
- *
- * Returns: PID for pipe
- */
-static inline int __cvmx_usb_get_data_pid(struct cvmx_usb_pipe *pipe)
-{
-       if (pipe->pid_toggle)
-               return 2; /* Data1 */
-       else
-               return 0; /* Data0 */
-}
-
-
-/**
- * Return the number of USB ports supported by this Octeon
- * chip. If the chip doesn't support USB, or is not supported
- * by this API, a zero will be returned. Most Octeon chips
- * support one usb port, but some support two ports.
- * cvmx_usb_initialize() must be called on independent
- * struct cvmx_usb_state.
- *
- * Returns: Number of port, zero if usb isn't supported
- */
-int cvmx_usb_get_num_ports(void)
-{
-       int arch_ports = 0;
-
-       if (OCTEON_IS_MODEL(OCTEON_CN56XX))
-               arch_ports = 1;
-       else if (OCTEON_IS_MODEL(OCTEON_CN52XX))
-               arch_ports = 2;
-       else if (OCTEON_IS_MODEL(OCTEON_CN50XX))
-               arch_ports = 1;
-       else if (OCTEON_IS_MODEL(OCTEON_CN31XX))
-               arch_ports = 1;
-       else if (OCTEON_IS_MODEL(OCTEON_CN30XX))
-               arch_ports = 1;
-       else
-               arch_ports = 0;
-
-       return arch_ports;
-}
-
-
-/**
- * Allocate a usb transaction for use
- *
- * @usb:        USB device state populated by
- *              cvmx_usb_initialize().
- *
- * Returns: Transaction or NULL
- */
-static inline struct cvmx_usb_transaction *__cvmx_usb_alloc_transaction(struct cvmx_usb_internal_state *usb)
-{
-       struct cvmx_usb_transaction *t;
-       t = usb->free_transaction_head;
-       if (t) {
-               usb->free_transaction_head = t->next;
-               if (!usb->free_transaction_head)
-                       usb->free_transaction_tail = NULL;
-       }
-       if (t) {
-               memset(t, 0, sizeof(*t));
-               t->flags = __CVMX_USB_TRANSACTION_FLAGS_IN_USE;
-       }
-       return t;
-}
-
-
-/**
- * Free a usb transaction
- *
- * @usb:        USB device state populated by
- *              cvmx_usb_initialize().
- * @transaction:
- *              Transaction to free
- */
-static inline void __cvmx_usb_free_transaction(struct cvmx_usb_internal_state *usb,
-                                              struct cvmx_usb_transaction *transaction)
-{
-       transaction->flags = 0;
-       transaction->prev = NULL;
-       transaction->next = NULL;
-       if (usb->free_transaction_tail)
-               usb->free_transaction_tail->next = transaction;
-       else
-               usb->free_transaction_head = transaction;
-       usb->free_transaction_tail = transaction;
-}
-
-
-/**
- * Add a pipe to the tail of a list
- * @list:   List to add pipe to
- * @pipe:   Pipe to add
- */
-static inline void __cvmx_usb_append_pipe(struct cvmx_usb_pipe_list *list, struct cvmx_usb_pipe *pipe)
-{
-       pipe->next = NULL;
-       pipe->prev = list->tail;
-       if (list->tail)
-               list->tail->next = pipe;
-       else
-               list->head = pipe;
-       list->tail = pipe;
-}
-
-
-/**
- * Remove a pipe from a list
- * @list:   List to remove pipe from
- * @pipe:   Pipe to remove
- */
-static inline void __cvmx_usb_remove_pipe(struct cvmx_usb_pipe_list *list, struct cvmx_usb_pipe *pipe)
-{
-       if (list->head == pipe) {
-               list->head = pipe->next;
-               pipe->next = NULL;
-               if (list->head)
-                       list->head->prev = NULL;
-               else
-                       list->tail = NULL;
-       } else if (list->tail == pipe) {
-               list->tail = pipe->prev;
-               list->tail->next = NULL;
-               pipe->prev = NULL;
-       } else {
-               pipe->prev->next = pipe->next;
-               pipe->next->prev = pipe->prev;
-               pipe->prev = NULL;
-               pipe->next = NULL;
-       }
-}
-
-
-/**
- * Initialize a USB port for use. This must be called before any
- * other access to the Octeon USB port is made. The port starts
- * off in the disabled state.
- *
- * @state:      Pointer to an empty struct cvmx_usb_state
- *              that will be populated by the initialize call.
- *              This structure is then passed to all other USB
- *              functions.
- * @usb_port_number:
- *              Which Octeon USB port to initialize.
- *
- * Returns: 0 or a negative error code.
- */
-int cvmx_usb_initialize(struct cvmx_usb_state *state, int usb_port_number)
-{
-       union cvmx_usbnx_clk_ctl usbn_clk_ctl;
-       union cvmx_usbnx_usbp_ctl_status usbn_usbp_ctl_status;
-       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
-       enum cvmx_usb_initialize_flags flags = 0;
-
-       /* Make sure that state is large enough to store the internal state */
-       if (sizeof(*state) < sizeof(*usb))
-               return -EINVAL;
-       /* At first allow 0-1 for the usb port number */
-       if ((usb_port_number < 0) || (usb_port_number > 1))
-               return -EINVAL;
-       /* For all chips except 52XX there is only one port */
-       if (!OCTEON_IS_MODEL(OCTEON_CN52XX) && (usb_port_number > 0))
-               return -EINVAL;
-       /* Try to determine clock type automatically */
-       if (octeon_usb_get_clock_type() == USB_CLOCK_TYPE_CRYSTAL_12) {
-               /* Only 12 MHZ crystals are supported */
-               flags |= CVMX_USB_INITIALIZE_FLAGS_CLOCK_XO_XI;
-       } else {
-               flags |= CVMX_USB_INITIALIZE_FLAGS_CLOCK_XO_GND;
-
-               switch (octeon_usb_get_clock_type()) {
-               case USB_CLOCK_TYPE_REF_12:
-                       flags |= CVMX_USB_INITIALIZE_FLAGS_CLOCK_12MHZ;
-                       break;
-               case USB_CLOCK_TYPE_REF_24:
-                       flags |= CVMX_USB_INITIALIZE_FLAGS_CLOCK_24MHZ;
-                       break;
-               case USB_CLOCK_TYPE_REF_48:
-                       flags |= CVMX_USB_INITIALIZE_FLAGS_CLOCK_48MHZ;
-                       break;
-               default:
-                       return -EINVAL;
-                       break;
-               }
-       }
-
-       memset(usb, 0, sizeof(*usb));
-       usb->init_flags = flags;
-
-       /* Initialize the USB state structure */
-       {
-               int i;
-               usb->index = usb_port_number;
-
-               /* Initialize the transaction double linked list */
-               usb->free_transaction_head = NULL;
-               usb->free_transaction_tail = NULL;
-               for (i = 0; i < MAX_TRANSACTIONS; i++)
-                       __cvmx_usb_free_transaction(usb, usb->transaction + i);
-               for (i = 0; i < MAX_PIPES; i++)
-                       __cvmx_usb_append_pipe(&usb->free_pipes, usb->pipe + i);
-       }
-
-       /*
-        * Power On Reset and PHY Initialization
-        *
-        * 1. Wait for DCOK to assert (nothing to do)
-        *
-        * 2a. Write USBN0/1_CLK_CTL[POR] = 1 and
-        *     USBN0/1_CLK_CTL[HRST,PRST,HCLK_RST] = 0
-        */
-       usbn_clk_ctl.u64 = __cvmx_usb_read_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index));
-       usbn_clk_ctl.s.por = 1;
-       usbn_clk_ctl.s.hrst = 0;
-       usbn_clk_ctl.s.prst = 0;
-       usbn_clk_ctl.s.hclk_rst = 0;
-       usbn_clk_ctl.s.enable = 0;
-       /*
-        * 2b. Select the USB reference clock/crystal parameters by writing
-        *     appropriate values to USBN0/1_CLK_CTL[P_C_SEL, P_RTYPE, P_COM_ON]
-        */
-       if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_CLOCK_XO_GND) {
-               /*
-                * The USB port uses 12/24/48MHz 2.5V board clock
-                * source at USB_XO. USB_XI should be tied to GND.
-                * Most Octeon evaluation boards require this setting
-                */
-               if (OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
-                       /* From CN31XX,CN30XX manual */
-                       usbn_clk_ctl.cn31xx.p_rclk  = 1;
-                       usbn_clk_ctl.cn31xx.p_xenbn = 0;
-               } else if (OCTEON_IS_MODEL(OCTEON_CN56XX) || OCTEON_IS_MODEL(OCTEON_CN50XX))
-                       /* From CN56XX,CN50XX manual */
-                       usbn_clk_ctl.cn56xx.p_rtype = 2;
-               else
-                       /* From CN52XX manual */
-                       usbn_clk_ctl.cn52xx.p_rtype = 1;
-
-               switch (flags & CVMX_USB_INITIALIZE_FLAGS_CLOCK_MHZ_MASK) {
-               case CVMX_USB_INITIALIZE_FLAGS_CLOCK_12MHZ:
-                       usbn_clk_ctl.s.p_c_sel = 0;
-                       break;
-               case CVMX_USB_INITIALIZE_FLAGS_CLOCK_24MHZ:
-                       usbn_clk_ctl.s.p_c_sel = 1;
-                       break;
-               case CVMX_USB_INITIALIZE_FLAGS_CLOCK_48MHZ:
-                       usbn_clk_ctl.s.p_c_sel = 2;
-                       break;
-               }
-       } else {
-               /*
-                * The USB port uses a 12MHz crystal as clock source
-                * at USB_XO and USB_XI
-                */
-               if (OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
-                       /* From CN31XX,CN30XX manual */
-                       usbn_clk_ctl.cn31xx.p_rclk  = 1;
-                       usbn_clk_ctl.cn31xx.p_xenbn = 1;
-               } else if (OCTEON_IS_MODEL(OCTEON_CN56XX) || OCTEON_IS_MODEL(OCTEON_CN50XX))
-                       /* From CN56XX,CN50XX manual */
-                       usbn_clk_ctl.cn56xx.p_rtype = 0;
-               else
-                       /* From CN52XX manual */
-                       usbn_clk_ctl.cn52xx.p_rtype = 0;
-
-               usbn_clk_ctl.s.p_c_sel = 0;
-       }
-       /*
-        * 2c. Select the HCLK via writing USBN0/1_CLK_CTL[DIVIDE, DIVIDE2] and
-        *     setting USBN0/1_CLK_CTL[ENABLE] = 1. Divide the core clock down
-        *     such that USB is as close as possible to 125Mhz
-        */
-       {
-               int divisor = (octeon_get_clock_rate()+125000000-1)/125000000;
-               /* Lower than 4 doesn't seem to work properly */
-               if (divisor < 4)
-                       divisor = 4;
-               usbn_clk_ctl.s.divide = divisor;
-               usbn_clk_ctl.s.divide2 = 0;
-       }
-       __cvmx_usb_write_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index),
-                              usbn_clk_ctl.u64);
-       /* 2d. Write USBN0/1_CLK_CTL[HCLK_RST] = 1 */
-       usbn_clk_ctl.s.hclk_rst = 1;
-       __cvmx_usb_write_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index),
-                              usbn_clk_ctl.u64);
-       /* 2e.  Wait 64 core-clock cycles for HCLK to stabilize */
-       cvmx_wait(64);
-       /*
-        * 3. Program the power-on reset field in the USBN clock-control
-        *    register:
-        *    USBN_CLK_CTL[POR] = 0
-        */
-       usbn_clk_ctl.s.por = 0;
-       __cvmx_usb_write_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index),
-                              usbn_clk_ctl.u64);
-       /* 4. Wait 1 ms for PHY clock to start */
-       mdelay(1);
-       /*
-        * 5. Program the Reset input from automatic test equipment field in the
-        *    USBP control and status register:
-        *    USBN_USBP_CTL_STATUS[ATE_RESET] = 1
-        */
-       usbn_usbp_ctl_status.u64 = __cvmx_usb_read_csr64(usb, CVMX_USBNX_USBP_CTL_STATUS(usb->index));
-       usbn_usbp_ctl_status.s.ate_reset = 1;
-       __cvmx_usb_write_csr64(usb, CVMX_USBNX_USBP_CTL_STATUS(usb->index),
-                              usbn_usbp_ctl_status.u64);
-       /* 6. Wait 10 cycles */
-       cvmx_wait(10);
-       /*
-        * 7. Clear ATE_RESET field in the USBN clock-control register:
-        *    USBN_USBP_CTL_STATUS[ATE_RESET] = 0
-        */
-       usbn_usbp_ctl_status.s.ate_reset = 0;
-       __cvmx_usb_write_csr64(usb, CVMX_USBNX_USBP_CTL_STATUS(usb->index),
-                              usbn_usbp_ctl_status.u64);
-       /*
-        * 8. Program the PHY reset field in the USBN clock-control register:
-        *    USBN_CLK_CTL[PRST] = 1
-        */
-       usbn_clk_ctl.s.prst = 1;
-       __cvmx_usb_write_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index),
-                              usbn_clk_ctl.u64);
-       /*
-        * 9. Program the USBP control and status register to select host or
-        *    device mode. USBN_USBP_CTL_STATUS[HST_MODE] = 0 for host, = 1 for
-        *    device
-        */
-       usbn_usbp_ctl_status.s.hst_mode = 0;
-       __cvmx_usb_write_csr64(usb, CVMX_USBNX_USBP_CTL_STATUS(usb->index),
-                              usbn_usbp_ctl_status.u64);
-       /* 10. Wait 1 us */
-       udelay(1);
-       /*
-        * 11. Program the hreset_n field in the USBN clock-control register:
-        *     USBN_CLK_CTL[HRST] = 1
-        */
-       usbn_clk_ctl.s.hrst = 1;
-       __cvmx_usb_write_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index),
-                              usbn_clk_ctl.u64);
-       /* 12. Proceed to USB core initialization */
-       usbn_clk_ctl.s.enable = 1;
-       __cvmx_usb_write_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index),
-                              usbn_clk_ctl.u64);
-       udelay(1);
-
-       /*
-        * USB Core Initialization
-        *
-        * 1. Read USBC_GHWCFG1, USBC_GHWCFG2, USBC_GHWCFG3, USBC_GHWCFG4 to
-        *    determine USB core configuration parameters.
-        *
-        *    Nothing needed
-        *
-        * 2. Program the following fields in the global AHB configuration
-        *    register (USBC_GAHBCFG)
-        *    DMA mode, USBC_GAHBCFG[DMAEn]: 1 = DMA mode, 0 = slave mode
-        *    Burst length, USBC_GAHBCFG[HBSTLEN] = 0
-        *    Nonperiodic TxFIFO empty level (slave mode only),
-        *    USBC_GAHBCFG[NPTXFEMPLVL]
-        *    Periodic TxFIFO empty level (slave mode only),
-        *    USBC_GAHBCFG[PTXFEMPLVL]
-        *    Global interrupt mask, USBC_GAHBCFG[GLBLINTRMSK] = 1
-        */
-       {
-               union cvmx_usbcx_gahbcfg usbcx_gahbcfg;
-               /* Due to an errata, CN31XX doesn't support DMA */
-               if (OCTEON_IS_MODEL(OCTEON_CN31XX))
-                       usb->init_flags |= CVMX_USB_INITIALIZE_FLAGS_NO_DMA;
-               usbcx_gahbcfg.u32 = 0;
-               usbcx_gahbcfg.s.dmaen = !(usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA);
-               if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA)
-                       /* Only use one channel with non DMA */
-                       usb->idle_hardware_channels = 0x1;
-               else if (OCTEON_IS_MODEL(OCTEON_CN5XXX))
-                       /* CN5XXX have an errata with channel 3 */
-                       usb->idle_hardware_channels = 0xf7;
-               else
-                       usb->idle_hardware_channels = 0xff;
-               usbcx_gahbcfg.s.hbstlen = 0;
-               usbcx_gahbcfg.s.nptxfemplvl = 1;
-               usbcx_gahbcfg.s.ptxfemplvl = 1;
-               usbcx_gahbcfg.s.glblintrmsk = 1;
-               __cvmx_usb_write_csr32(usb, CVMX_USBCX_GAHBCFG(usb->index),
-                                      usbcx_gahbcfg.u32);
-       }
-       /*
-        * 3. Program the following fields in USBC_GUSBCFG register.
-        *    HS/FS timeout calibration, USBC_GUSBCFG[TOUTCAL] = 0
-        *    ULPI DDR select, USBC_GUSBCFG[DDRSEL] = 0
-        *    USB turnaround time, USBC_GUSBCFG[USBTRDTIM] = 0x5
-        *    PHY low-power clock select, USBC_GUSBCFG[PHYLPWRCLKSEL] = 0
-        */
-       {
-               union cvmx_usbcx_gusbcfg usbcx_gusbcfg;
-               usbcx_gusbcfg.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_GUSBCFG(usb->index));
-               usbcx_gusbcfg.s.toutcal = 0;
-               usbcx_gusbcfg.s.ddrsel = 0;
-               usbcx_gusbcfg.s.usbtrdtim = 0x5;
-               usbcx_gusbcfg.s.phylpwrclksel = 0;
-               __cvmx_usb_write_csr32(usb, CVMX_USBCX_GUSBCFG(usb->index),
-                                      usbcx_gusbcfg.u32);
-       }
-       /*
-        * 4. The software must unmask the following bits in the USBC_GINTMSK
-        *    register.
-        *    OTG interrupt mask, USBC_GINTMSK[OTGINTMSK] = 1
-        *    Mode mismatch interrupt mask, USBC_GINTMSK[MODEMISMSK] = 1
-        */
-       {
-               union cvmx_usbcx_gintmsk usbcx_gintmsk;
-               int channel;
-
-               usbcx_gintmsk.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_GINTMSK(usb->index));
-               usbcx_gintmsk.s.otgintmsk = 1;
-               usbcx_gintmsk.s.modemismsk = 1;
-               usbcx_gintmsk.s.hchintmsk = 1;
-               usbcx_gintmsk.s.sofmsk = 0;
-               /* We need RX FIFO interrupts if we don't have DMA */
-               if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA)
-                       usbcx_gintmsk.s.rxflvlmsk = 1;
-               __cvmx_usb_write_csr32(usb, CVMX_USBCX_GINTMSK(usb->index),
-                                      usbcx_gintmsk.u32);
-
-               /*
-                * Disable all channel interrupts. We'll enable them per channel
-                * later.
-                */
-               for (channel = 0; channel < 8; channel++)
-                       __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCINTMSKX(channel, usb->index), 0);
-       }
-
-       {
-               /*
-                * Host Port Initialization
-                *
-                * 1. Program the host-port interrupt-mask field to unmask,
-                *    USBC_GINTMSK[PRTINT] = 1
-                */
-               USB_SET_FIELD32(CVMX_USBCX_GINTMSK(usb->index), union cvmx_usbcx_gintmsk,
-                               prtintmsk, 1);
-               USB_SET_FIELD32(CVMX_USBCX_GINTMSK(usb->index), union cvmx_usbcx_gintmsk,
-                               disconnintmsk, 1);
-               /*
-                * 2. Program the USBC_HCFG register to select full-speed host
-                *    or high-speed host.
-                */
-               {
-                       union cvmx_usbcx_hcfg usbcx_hcfg;
-                       usbcx_hcfg.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCFG(usb->index));
-                       usbcx_hcfg.s.fslssupp = 0;
-                       usbcx_hcfg.s.fslspclksel = 0;
-                       __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCFG(usb->index), usbcx_hcfg.u32);
-               }
-               /*
-                * 3. Program the port power bit to drive VBUS on the USB,
-                *    USBC_HPRT[PRTPWR] = 1
-                */
-               USB_SET_FIELD32(CVMX_USBCX_HPRT(usb->index), union cvmx_usbcx_hprt, prtpwr, 1);
-
-               /*
-                * Steps 4-15 from the manual are done later in the port enable
-                */
-       }
-
-       return 0;
-}
-
-
-/**
- * Shutdown a USB port after a call to cvmx_usb_initialize().
- * The port should be disabled with all pipes closed when this
- * function is called.
- *
- * @state: USB device state populated by
- *        cvmx_usb_initialize().
- *
- * Returns: 0 or a negative error code.
- */
-int cvmx_usb_shutdown(struct cvmx_usb_state *state)
-{
-       union cvmx_usbnx_clk_ctl usbn_clk_ctl;
-       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
-
-       /* Make sure all pipes are closed */
-       if (usb->idle_pipes.head ||
-               usb->active_pipes[CVMX_USB_TRANSFER_ISOCHRONOUS].head ||
-               usb->active_pipes[CVMX_USB_TRANSFER_INTERRUPT].head ||
-               usb->active_pipes[CVMX_USB_TRANSFER_CONTROL].head ||
-               usb->active_pipes[CVMX_USB_TRANSFER_BULK].head)
-               return -EBUSY;
-
-       /* Disable the clocks and put them in power on reset */
-       usbn_clk_ctl.u64 = __cvmx_usb_read_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index));
-       usbn_clk_ctl.s.enable = 1;
-       usbn_clk_ctl.s.por = 1;
-       usbn_clk_ctl.s.hclk_rst = 1;
-       usbn_clk_ctl.s.prst = 0;
-       usbn_clk_ctl.s.hrst = 0;
-       __cvmx_usb_write_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index),
-                              usbn_clk_ctl.u64);
-       return 0;
-}
-
-
-/**
- * Enable a USB port. After this call succeeds, the USB port is
- * online and servicing requests.
- *
- * @state: USB device state populated by
- *        cvmx_usb_initialize().
- *
- * Returns: 0 or a negative error code.
- */
-int cvmx_usb_enable(struct cvmx_usb_state *state)
-{
-       union cvmx_usbcx_ghwcfg3 usbcx_ghwcfg3;
-       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
-
-       usb->usbcx_hprt.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HPRT(usb->index));
-
-       /*
-        * If the port is already enabled the just return. We don't need to do
-        * anything
-        */
-       if (usb->usbcx_hprt.s.prtena)
-               return 0;
-
-       /* If there is nothing plugged into the port then fail immediately */
-       if (!usb->usbcx_hprt.s.prtconnsts) {
-               return -ETIMEDOUT;
-       }
-
-       /* Program the port reset bit to start the reset process */
-       USB_SET_FIELD32(CVMX_USBCX_HPRT(usb->index), union cvmx_usbcx_hprt, prtrst, 1);
-
-       /*
-        * Wait at least 50ms (high speed), or 10ms (full speed) for the reset
-        * process to complete.
-        */
-       mdelay(50);
-
-       /* Program the port reset bit to 0, USBC_HPRT[PRTRST] = 0 */
-       USB_SET_FIELD32(CVMX_USBCX_HPRT(usb->index), union cvmx_usbcx_hprt, prtrst, 0);
-
-       /* Wait for the USBC_HPRT[PRTENA]. */
-       if (CVMX_WAIT_FOR_FIELD32(CVMX_USBCX_HPRT(usb->index), union cvmx_usbcx_hprt,
-                                 prtena, ==, 1, 100000))
-               return -ETIMEDOUT;
-
-       /*
-        * Read the port speed field to get the enumerated speed,
-        * USBC_HPRT[PRTSPD].
-        */
-       usb->usbcx_hprt.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HPRT(usb->index));
-       usbcx_ghwcfg3.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_GHWCFG3(usb->index));
-
-       /*
-        * 13. Program the USBC_GRXFSIZ register to select the size of the
-        *     receive FIFO (25%).
-        */
-       USB_SET_FIELD32(CVMX_USBCX_GRXFSIZ(usb->index), union cvmx_usbcx_grxfsiz,
-                       rxfdep, usbcx_ghwcfg3.s.dfifodepth / 4);
-       /*
-        * 14. Program the USBC_GNPTXFSIZ register to select the size and the
-        *     start address of the non- periodic transmit FIFO for nonperiodic
-        *     transactions (50%).
-        */
-       {
-               union cvmx_usbcx_gnptxfsiz siz;
-               siz.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_GNPTXFSIZ(usb->index));
-               siz.s.nptxfdep = usbcx_ghwcfg3.s.dfifodepth / 2;
-               siz.s.nptxfstaddr = usbcx_ghwcfg3.s.dfifodepth / 4;
-               __cvmx_usb_write_csr32(usb, CVMX_USBCX_GNPTXFSIZ(usb->index), siz.u32);
-       }
-       /*
-        * 15. Program the USBC_HPTXFSIZ register to select the size and start
-        *     address of the periodic transmit FIFO for periodic transactions
-        *     (25%).
-        */
-       {
-               union cvmx_usbcx_hptxfsiz siz;
-               siz.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HPTXFSIZ(usb->index));
-               siz.s.ptxfsize = usbcx_ghwcfg3.s.dfifodepth / 4;
-               siz.s.ptxfstaddr = 3 * usbcx_ghwcfg3.s.dfifodepth / 4;
-               __cvmx_usb_write_csr32(usb, CVMX_USBCX_HPTXFSIZ(usb->index), siz.u32);
-       }
-       /* Flush all FIFOs */
-       USB_SET_FIELD32(CVMX_USBCX_GRSTCTL(usb->index), union cvmx_usbcx_grstctl, txfnum, 0x10);
-       USB_SET_FIELD32(CVMX_USBCX_GRSTCTL(usb->index), union cvmx_usbcx_grstctl, txfflsh, 1);
-       CVMX_WAIT_FOR_FIELD32(CVMX_USBCX_GRSTCTL(usb->index), union cvmx_usbcx_grstctl,
-                             txfflsh, ==, 0, 100);
-       USB_SET_FIELD32(CVMX_USBCX_GRSTCTL(usb->index), union cvmx_usbcx_grstctl, rxfflsh, 1);
-       CVMX_WAIT_FOR_FIELD32(CVMX_USBCX_GRSTCTL(usb->index), union cvmx_usbcx_grstctl,
-                             rxfflsh, ==, 0, 100);
-
-       return 0;
-}
-
-
-/**
- * Disable a USB port. After this call the USB port will not
- * generate data transfers and will not generate events.
- * Transactions in process will fail and call their
- * associated callbacks.
- *
- * @state: USB device state populated by
- *        cvmx_usb_initialize().
- *
- * Returns: 0 or a negative error code.
- */
-int cvmx_usb_disable(struct cvmx_usb_state *state)
-{
-       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
-
-       /* Disable the port */
-       USB_SET_FIELD32(CVMX_USBCX_HPRT(usb->index), union cvmx_usbcx_hprt, prtena, 1);
-       return 0;
-}
-
-
-/**
- * Get the current state of the USB port. Use this call to
- * determine if the usb port has anything connected, is enabled,
- * or has some sort of error condition. The return value of this
- * call has "changed" bits to signal of the value of some fields
- * have changed between calls. These "changed" fields are based
- * on the last call to cvmx_usb_set_status(). In order to clear
- * them, you must update the status through cvmx_usb_set_status().
- *
- * @state: USB device state populated by
- *        cvmx_usb_initialize().
- *
- * Returns: Port status information
- */
-struct cvmx_usb_port_status cvmx_usb_get_status(struct cvmx_usb_state *state)
-{
-       union cvmx_usbcx_hprt usbc_hprt;
-       struct cvmx_usb_port_status result;
-       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
-
-       memset(&result, 0, sizeof(result));
-
-       usbc_hprt.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HPRT(usb->index));
-       result.port_enabled = usbc_hprt.s.prtena;
-       result.port_over_current = usbc_hprt.s.prtovrcurract;
-       result.port_powered = usbc_hprt.s.prtpwr;
-       result.port_speed = usbc_hprt.s.prtspd;
-       result.connected = usbc_hprt.s.prtconnsts;
-       result.connect_change = (result.connected != usb->port_status.connected);
-
-       return result;
-}
-
-
-/**
- * Set the current state of the USB port. The status is used as
- * a reference for the "changed" bits returned by
- * cvmx_usb_get_status(). Other than serving as a reference, the
- * status passed to this function is not used. No fields can be
- * changed through this call.
- *
- * @state:      USB device state populated by
- *              cvmx_usb_initialize().
- * @port_status:
- *              Port status to set, most like returned by cvmx_usb_get_status()
- */
-void cvmx_usb_set_status(struct cvmx_usb_state *state, struct cvmx_usb_port_status port_status)
-{
-       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
-       usb->port_status = port_status;
-       return;
-}
-
-
-/**
- * Convert a USB transaction into a handle
- *
- * @usb:        USB device state populated by
- *              cvmx_usb_initialize().
- * @transaction:
- *              Transaction to get handle for
- *
- * Returns: Handle
- */
-static inline int __cvmx_usb_get_submit_handle(struct cvmx_usb_internal_state *usb,
-                                              struct cvmx_usb_transaction *transaction)
-{
-       return ((unsigned long)transaction - (unsigned long)usb->transaction) /
-                       sizeof(*transaction);
-}
-
-
-/**
- * Convert a USB pipe into a handle
- *
- * @usb:        USB device state populated by
- *              cvmx_usb_initialize().
- * @pipe:       Pipe to get handle for
- *
- * Returns: Handle
- */
-static inline int __cvmx_usb_get_pipe_handle(struct cvmx_usb_internal_state *usb,
-                                            struct cvmx_usb_pipe *pipe)
-{
-       return ((unsigned long)pipe - (unsigned long)usb->pipe) / sizeof(*pipe);
-}
-
-
-/**
- * Open a virtual pipe between the host and a USB device. A pipe
- * must be opened before data can be transferred between a device
- * and Octeon.
- *
- * @state:          USB device state populated by
- *                  cvmx_usb_initialize().
- * @device_addr:
- *                  USB device address to open the pipe to
- *                  (0-127).
- * @endpoint_num:
- *                  USB endpoint number to open the pipe to
- *                  (0-15).
- * @device_speed:
- *                  The speed of the device the pipe is going
- *                  to. This must match the device's speed,
- *                  which may be different than the port speed.
- * @max_packet:             The maximum packet length the device can
- *                  transmit/receive (low speed=0-8, full
- *                  speed=0-1023, high speed=0-1024). This value
- *                  comes from the standard endpoint descriptor
- *                  field wMaxPacketSize bits <10:0>.
- * @transfer_type:
- *                  The type of transfer this pipe is for.
- * @transfer_dir:
- *                  The direction the pipe is in. This is not
- *                  used for control pipes.
- * @interval:       For ISOCHRONOUS and INTERRUPT transfers,
- *                  this is how often the transfer is scheduled
- *                  for. All other transfers should specify
- *                  zero. The units are in frames (8000/sec at
- *                  high speed, 1000/sec for full speed).
- * @multi_count:
- *                  For high speed devices, this is the maximum
- *                  allowed number of packet per microframe.
- *                  Specify zero for non high speed devices. This
- *                  value comes from the standard endpoint descriptor
- *                  field wMaxPacketSize bits <12:11>.
- * @hub_device_addr:
- *                  Hub device address this device is connected
- *                  to. Devices connected directly to Octeon
- *                  use zero. This is only used when the device
- *                  is full/low speed behind a high speed hub.
- *                  The address will be of the high speed hub,
- *                  not and full speed hubs after it.
- * @hub_port:       Which port on the hub the device is
- *                  connected. Use zero for devices connected
- *                  directly to Octeon. Like hub_device_addr,
- *                  this is only used for full/low speed
- *                  devices behind a high speed hub.
- *
- * Returns: A non negative value is a pipe handle. Negative
- *         values are error codes.
- */
-int cvmx_usb_open_pipe(struct cvmx_usb_state *state,
-                      int device_addr, int endpoint_num,
-                      enum cvmx_usb_speed device_speed, int max_packet,
-                      enum cvmx_usb_transfer transfer_type,
-                      enum cvmx_usb_direction transfer_dir, int interval,
-                      int multi_count, int hub_device_addr, int hub_port)
-{
-       struct cvmx_usb_pipe *pipe;
-       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
-
-       if (unlikely((device_addr < 0) || (device_addr > MAX_USB_ADDRESS)))
-               return -EINVAL;
-       if (unlikely((endpoint_num < 0) || (endpoint_num > MAX_USB_ENDPOINT)))
-               return -EINVAL;
-       if (unlikely(device_speed > CVMX_USB_SPEED_LOW))
-               return -EINVAL;
-       if (unlikely((max_packet <= 0) || (max_packet > 1024)))
-               return -EINVAL;
-       if (unlikely(transfer_type > CVMX_USB_TRANSFER_INTERRUPT))
-               return -EINVAL;
-       if (unlikely((transfer_dir != CVMX_USB_DIRECTION_OUT) &&
-               (transfer_dir != CVMX_USB_DIRECTION_IN)))
-               return -EINVAL;
-       if (unlikely(interval < 0))
-               return -EINVAL;
-       if (unlikely((transfer_type == CVMX_USB_TRANSFER_CONTROL) && interval))
-               return -EINVAL;
-       if (unlikely(multi_count < 0))
-               return -EINVAL;
-       if (unlikely((device_speed != CVMX_USB_SPEED_HIGH) &&
-               (multi_count != 0)))
-               return -EINVAL;
-       if (unlikely((hub_device_addr < 0) || (hub_device_addr > MAX_USB_ADDRESS)))
-               return -EINVAL;
-       if (unlikely((hub_port < 0) || (hub_port > MAX_USB_HUB_PORT)))
-               return -EINVAL;
-
-       /* Find a free pipe */
-       pipe = usb->free_pipes.head;
-       if (!pipe)
-               return -ENOMEM;
-       __cvmx_usb_remove_pipe(&usb->free_pipes, pipe);
-       pipe->flags = __CVMX_USB_PIPE_FLAGS_OPEN;
-       if ((device_speed == CVMX_USB_SPEED_HIGH) &&
-               (transfer_dir == CVMX_USB_DIRECTION_OUT) &&
-               (transfer_type == CVMX_USB_TRANSFER_BULK))
-               pipe->flags |= __CVMX_USB_PIPE_FLAGS_NEED_PING;
-       pipe->device_addr = device_addr;
-       pipe->endpoint_num = endpoint_num;
-       pipe->device_speed = device_speed;
-       pipe->max_packet = max_packet;
-       pipe->transfer_type = transfer_type;
-       pipe->transfer_dir = transfer_dir;
-       /*
-        * All pipes use interval to rate limit NAK processing. Force an
-        * interval if one wasn't supplied
-        */
-       if (!interval)
-               interval = 1;
-       if (__cvmx_usb_pipe_needs_split(usb, pipe)) {
-               pipe->interval = interval*8;
-               /* Force start splits to be schedule on uFrame 0 */
-               pipe->next_tx_frame = ((usb->frame_number+7)&~7) + pipe->interval;
-       } else {
-               pipe->interval = interval;
-               pipe->next_tx_frame = usb->frame_number + pipe->interval;
-       }
-       pipe->multi_count = multi_count;
-       pipe->hub_device_addr = hub_device_addr;
-       pipe->hub_port = hub_port;
-       pipe->pid_toggle = 0;
-       pipe->split_sc_frame = -1;
-       __cvmx_usb_append_pipe(&usb->idle_pipes, pipe);
-
-       /*
-        * We don't need to tell the hardware about this pipe yet since
-        * it doesn't have any submitted requests
-        */
-
-       return __cvmx_usb_get_pipe_handle(usb, pipe);
-}
-
-
-/**
- * Poll the RX FIFOs and remove data as needed. This function is only used
- * in non DMA mode. It is very important that this function be called quickly
- * enough to prevent FIFO overflow.
- *
- * @usb:       USB device state populated by
- *             cvmx_usb_initialize().
- */
-static void __cvmx_usb_poll_rx_fifo(struct cvmx_usb_internal_state *usb)
-{
-       union cvmx_usbcx_grxstsph rx_status;
-       int channel;
-       int bytes;
-       uint64_t address;
-       uint32_t *ptr;
-
-       rx_status.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_GRXSTSPH(usb->index));
-       /* Only read data if IN data is there */
-       if (rx_status.s.pktsts != 2)
-               return;
-       /* Check if no data is available */
-       if (!rx_status.s.bcnt)
-               return;
-
-       channel = rx_status.s.chnum;
-       bytes = rx_status.s.bcnt;
-       if (!bytes)
-               return;
-
-       /* Get where the DMA engine would have written this data */
-       address = __cvmx_usb_read_csr64(usb, CVMX_USBNX_DMA0_INB_CHN0(usb->index) + channel*8);
-       ptr = cvmx_phys_to_ptr(address);
-       __cvmx_usb_write_csr64(usb, CVMX_USBNX_DMA0_INB_CHN0(usb->index) + channel*8, address + bytes);
-
-       /* Loop writing the FIFO data for this packet into memory */
-       while (bytes > 0) {
-               *ptr++ = __cvmx_usb_read_csr32(usb, USB_FIFO_ADDRESS(channel, usb->index));
-               bytes -= 4;
-       }
-       CVMX_SYNCW;
-
-       return;
-}
-
-
-/**
- * Fill the TX hardware fifo with data out of the software
- * fifos
- *
- * @usb:           USB device state populated by
- *                 cvmx_usb_initialize().
- * @fifo:          Software fifo to use
- * @available:     Amount of space in the hardware fifo
- *
- * Returns: Non zero if the hardware fifo was too small and needs
- *         to be serviced again.
- */
-static int __cvmx_usb_fill_tx_hw(struct cvmx_usb_internal_state *usb, struct cvmx_usb_tx_fifo *fifo, int available)
-{
-       /*
-        * We're done either when there isn't anymore space or the software FIFO
-        * is empty
-        */
-       while (available && (fifo->head != fifo->tail)) {
-               int i = fifo->tail;
-               const uint32_t *ptr = cvmx_phys_to_ptr(fifo->entry[i].address);
-               uint64_t csr_address = USB_FIFO_ADDRESS(fifo->entry[i].channel, usb->index) ^ 4;
-               int words = available;
-
-               /* Limit the amount of data to waht the SW fifo has */
-               if (fifo->entry[i].size <= available) {
-                       words = fifo->entry[i].size;
-                       fifo->tail++;
-                       if (fifo->tail > MAX_CHANNELS)
-                               fifo->tail = 0;
-               }
-
-               /* Update the next locations and counts */
-               available -= words;
-               fifo->entry[i].address += words * 4;
-               fifo->entry[i].size -= words;
-
-               /*
-                * Write the HW fifo data. The read every three writes is due
-                * to an errata on CN3XXX chips
-                */
-               while (words > 3) {
-                       cvmx_write64_uint32(csr_address, *ptr++);
-                       cvmx_write64_uint32(csr_address, *ptr++);
-                       cvmx_write64_uint32(csr_address, *ptr++);
-                       cvmx_read64_uint64(CVMX_USBNX_DMA0_INB_CHN0(usb->index));
-                       words -= 3;
-               }
-               cvmx_write64_uint32(csr_address, *ptr++);
-               if (--words) {
-                       cvmx_write64_uint32(csr_address, *ptr++);
-                       if (--words)
-                               cvmx_write64_uint32(csr_address, *ptr++);
-               }
-               cvmx_read64_uint64(CVMX_USBNX_DMA0_INB_CHN0(usb->index));
-       }
-       return fifo->head != fifo->tail;
-}
-
-
-/**
- * Check the hardware FIFOs and fill them as needed
- *
- * @usb:       USB device state populated by
- *             cvmx_usb_initialize().
- */
-static void __cvmx_usb_poll_tx_fifo(struct cvmx_usb_internal_state *usb)
-{
-       if (usb->periodic.head != usb->periodic.tail) {
-               union cvmx_usbcx_hptxsts tx_status;
-               tx_status.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HPTXSTS(usb->index));
-               if (__cvmx_usb_fill_tx_hw(usb, &usb->periodic, tx_status.s.ptxfspcavail))
-                       USB_SET_FIELD32(CVMX_USBCX_GINTMSK(usb->index), union cvmx_usbcx_gintmsk, ptxfempmsk, 1);
-               else
-                       USB_SET_FIELD32(CVMX_USBCX_GINTMSK(usb->index), union cvmx_usbcx_gintmsk, ptxfempmsk, 0);
-       }
-
-       if (usb->nonperiodic.head != usb->nonperiodic.tail) {
-               union cvmx_usbcx_gnptxsts tx_status;
-               tx_status.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_GNPTXSTS(usb->index));
-               if (__cvmx_usb_fill_tx_hw(usb, &usb->nonperiodic, tx_status.s.nptxfspcavail))
-                       USB_SET_FIELD32(CVMX_USBCX_GINTMSK(usb->index), union cvmx_usbcx_gintmsk, nptxfempmsk, 1);
-               else
-                       USB_SET_FIELD32(CVMX_USBCX_GINTMSK(usb->index), union cvmx_usbcx_gintmsk, nptxfempmsk, 0);
-       }
-
-       return;
-}
-
-
-/**
- * Fill the TX FIFO with an outgoing packet
- *
- * @usb:         USB device state populated by
- *               cvmx_usb_initialize().
- * @channel:     Channel number to get packet from
- */
-static void __cvmx_usb_fill_tx_fifo(struct cvmx_usb_internal_state *usb, int channel)
-{
-       union cvmx_usbcx_hccharx hcchar;
-       union cvmx_usbcx_hcspltx usbc_hcsplt;
-       union cvmx_usbcx_hctsizx usbc_hctsiz;
-       struct cvmx_usb_tx_fifo *fifo;
-
-       /* We only need to fill data on outbound channels */
-       hcchar.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCCHARX(channel, usb->index));
-       if (hcchar.s.epdir != CVMX_USB_DIRECTION_OUT)
-               return;
-
-       /* OUT Splits only have data on the start and not the complete */
-       usbc_hcsplt.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCSPLTX(channel, usb->index));
-       if (usbc_hcsplt.s.spltena && usbc_hcsplt.s.compsplt)
-               return;
-
-       /*
-        * Find out how many bytes we need to fill and convert it into 32bit
-        * words.
-        */
-       usbc_hctsiz.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCTSIZX(channel, usb->index));
-       if (!usbc_hctsiz.s.xfersize)
-               return;
-
-       if ((hcchar.s.eptype == CVMX_USB_TRANSFER_INTERRUPT) ||
-               (hcchar.s.eptype == CVMX_USB_TRANSFER_ISOCHRONOUS))
-               fifo = &usb->periodic;
-       else
-               fifo = &usb->nonperiodic;
-
-       fifo->entry[fifo->head].channel = channel;
-       fifo->entry[fifo->head].address = __cvmx_usb_read_csr64(usb, CVMX_USBNX_DMA0_OUTB_CHN0(usb->index) + channel*8);
-       fifo->entry[fifo->head].size = (usbc_hctsiz.s.xfersize+3)>>2;
-       fifo->head++;
-       if (fifo->head > MAX_CHANNELS)
-               fifo->head = 0;
-
-       __cvmx_usb_poll_tx_fifo(usb);
-
-       return;
-}
-
-/**
- * Perform channel specific setup for Control transactions. All
- * the generic stuff will already have been done in
- * __cvmx_usb_start_channel()
- *
- * @usb:         USB device state populated by
- *               cvmx_usb_initialize().
- * @channel:     Channel to setup
- * @pipe:        Pipe for control transaction
- */
-static void __cvmx_usb_start_channel_control(struct cvmx_usb_internal_state *usb,
-                                            int channel,
-                                            struct cvmx_usb_pipe *pipe)
-{
-       struct cvmx_usb_transaction *transaction = pipe->head;
-       union cvmx_usb_control_header *header =
-               cvmx_phys_to_ptr(transaction->control_header);
-       int bytes_to_transfer = transaction->buffer_length - transaction->actual_bytes;
-       int packets_to_transfer;
-       union cvmx_usbcx_hctsizx usbc_hctsiz;
-
-       usbc_hctsiz.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCTSIZX(channel, usb->index));
-
-       switch (transaction->stage) {
-       case CVMX_USB_STAGE_NON_CONTROL:
-       case CVMX_USB_STAGE_NON_CONTROL_SPLIT_COMPLETE:
-               cvmx_dprintf("%s: ERROR - Non control stage\n", __FUNCTION__);
-               break;
-       case CVMX_USB_STAGE_SETUP:
-               usbc_hctsiz.s.pid = 3; /* Setup */
-               bytes_to_transfer = sizeof(*header);
-               /* All Control operations start with a setup going OUT */
-               USB_SET_FIELD32(CVMX_USBCX_HCCHARX(channel, usb->index), union cvmx_usbcx_hccharx, epdir, CVMX_USB_DIRECTION_OUT);
-               /*
-                * Setup send the control header instead of the buffer data. The
-                * buffer data will be used in the next stage
-                */
-               __cvmx_usb_write_csr64(usb, CVMX_USBNX_DMA0_OUTB_CHN0(usb->index) + channel*8, transaction->control_header);
-               break;
-       case CVMX_USB_STAGE_SETUP_SPLIT_COMPLETE:
-               usbc_hctsiz.s.pid = 3; /* Setup */
-               bytes_to_transfer = 0;
-               /* All Control operations start with a setup going OUT */
-               USB_SET_FIELD32(CVMX_USBCX_HCCHARX(channel, usb->index), union cvmx_usbcx_hccharx, epdir, CVMX_USB_DIRECTION_OUT);
-               USB_SET_FIELD32(CVMX_USBCX_HCSPLTX(channel, usb->index), union cvmx_usbcx_hcspltx, compsplt, 1);
-               break;
-       case CVMX_USB_STAGE_DATA:
-               usbc_hctsiz.s.pid = __cvmx_usb_get_data_pid(pipe);
-               if (__cvmx_usb_pipe_needs_split(usb, pipe)) {
-                       if (header->s.request_type & 0x80)
-                               bytes_to_transfer = 0;
-                       else if (bytes_to_transfer > pipe->max_packet)
-                               bytes_to_transfer = pipe->max_packet;
-               }
-               USB_SET_FIELD32(CVMX_USBCX_HCCHARX(channel, usb->index),
-                               union cvmx_usbcx_hccharx, epdir,
-                               ((header->s.request_type & 0x80) ?
-                                       CVMX_USB_DIRECTION_IN :
-                                       CVMX_USB_DIRECTION_OUT));
-               break;
-       case CVMX_USB_STAGE_DATA_SPLIT_COMPLETE:
-               usbc_hctsiz.s.pid = __cvmx_usb_get_data_pid(pipe);
-               if (!(header->s.request_type & 0x80))
-                       bytes_to_transfer = 0;
-               USB_SET_FIELD32(CVMX_USBCX_HCCHARX(channel, usb->index),
-                               union cvmx_usbcx_hccharx, epdir,
-                               ((header->s.request_type & 0x80) ?
-                                       CVMX_USB_DIRECTION_IN :
-                                       CVMX_USB_DIRECTION_OUT));
-               USB_SET_FIELD32(CVMX_USBCX_HCSPLTX(channel, usb->index), union cvmx_usbcx_hcspltx, compsplt, 1);
-               break;
-       case CVMX_USB_STAGE_STATUS:
-               usbc_hctsiz.s.pid = __cvmx_usb_get_data_pid(pipe);
-               bytes_to_transfer = 0;
-               USB_SET_FIELD32(CVMX_USBCX_HCCHARX(channel, usb->index), union cvmx_usbcx_hccharx, epdir,
-                               ((header->s.request_type & 0x80) ?
-                                       CVMX_USB_DIRECTION_OUT :
-                                       CVMX_USB_DIRECTION_IN));
-               break;
-       case CVMX_USB_STAGE_STATUS_SPLIT_COMPLETE:
-               usbc_hctsiz.s.pid = __cvmx_usb_get_data_pid(pipe);
-               bytes_to_transfer = 0;
-               USB_SET_FIELD32(CVMX_USBCX_HCCHARX(channel, usb->index), union cvmx_usbcx_hccharx, epdir,
-                               ((header->s.request_type & 0x80) ?
-                                       CVMX_USB_DIRECTION_OUT :
-                                       CVMX_USB_DIRECTION_IN));
-               USB_SET_FIELD32(CVMX_USBCX_HCSPLTX(channel, usb->index), union cvmx_usbcx_hcspltx, compsplt, 1);
-               break;
-       }
-
-       /*
-        * Make sure the transfer never exceeds the byte limit of the hardware.
-        * Further bytes will be sent as continued transactions
-        */
-       if (bytes_to_transfer > MAX_TRANSFER_BYTES) {
-               /* Round MAX_TRANSFER_BYTES to a multiple of out packet size */
-               bytes_to_transfer = MAX_TRANSFER_BYTES / pipe->max_packet;
-               bytes_to_transfer *= pipe->max_packet;
-       }
-
-       /*
-        * Calculate the number of packets to transfer. If the length is zero
-        * we still need to transfer one packet
-        */
-       packets_to_transfer = (bytes_to_transfer + pipe->max_packet - 1) / pipe->max_packet;
-       if (packets_to_transfer == 0)
-               packets_to_transfer = 1;
-       else if ((packets_to_transfer > 1) && (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA)) {
-               /*
-                * Limit to one packet when not using DMA. Channels must be
-                * restarted between every packet for IN transactions, so there
-                * is no reason to do multiple packets in a row
-                */
-               packets_to_transfer = 1;
-               bytes_to_transfer = packets_to_transfer * pipe->max_packet;
-       } else if (packets_to_transfer > MAX_TRANSFER_PACKETS) {
-               /*
-                * Limit the number of packet and data transferred to what the
-                * hardware can handle
-                */
-               packets_to_transfer = MAX_TRANSFER_PACKETS;
-               bytes_to_transfer = packets_to_transfer * pipe->max_packet;
-       }
-
-       usbc_hctsiz.s.xfersize = bytes_to_transfer;
-       usbc_hctsiz.s.pktcnt = packets_to_transfer;
-
-       __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCTSIZX(channel, usb->index), usbc_hctsiz.u32);
-       return;
-}
-
-
-/**
- * Start a channel to perform the pipe's head transaction
- *
- * @usb:         USB device state populated by
- *               cvmx_usb_initialize().
- * @channel:     Channel to setup
- * @pipe:        Pipe to start
- */
-static void __cvmx_usb_start_channel(struct cvmx_usb_internal_state *usb,
-                                    int channel,
-                                    struct cvmx_usb_pipe *pipe)
-{
-       struct cvmx_usb_transaction *transaction = pipe->head;
-
-       /* Make sure all writes to the DMA region get flushed */
-       CVMX_SYNCW;
-
-       /* Attach the channel to the pipe */
-       usb->pipe_for_channel[channel] = pipe;
-       pipe->channel = channel;
-       pipe->flags |= __CVMX_USB_PIPE_FLAGS_SCHEDULED;
-
-       /* Mark this channel as in use */
-       usb->idle_hardware_channels &= ~(1<<channel);
-
-       /* Enable the channel interrupt bits */
-       {
-               union cvmx_usbcx_hcintx usbc_hcint;
-               union cvmx_usbcx_hcintmskx usbc_hcintmsk;
-               union cvmx_usbcx_haintmsk usbc_haintmsk;
-
-               /* Clear all channel status bits */
-               usbc_hcint.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCINTX(channel, usb->index));
-               __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCINTX(channel, usb->index), usbc_hcint.u32);
-
-               usbc_hcintmsk.u32 = 0;
-               usbc_hcintmsk.s.chhltdmsk = 1;
-               if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA) {
-                       /*
-                        * Channels need these extra interrupts when we aren't
-                        * in DMA mode.
-                        */
-                       usbc_hcintmsk.s.datatglerrmsk = 1;
-                       usbc_hcintmsk.s.frmovrunmsk = 1;
-                       usbc_hcintmsk.s.bblerrmsk = 1;
-                       usbc_hcintmsk.s.xacterrmsk = 1;
-                       if (__cvmx_usb_pipe_needs_split(usb, pipe)) {
-                               /*
-                                * Splits don't generate xfercompl, so we need
-                                * ACK and NYET.
-                                */
-                               usbc_hcintmsk.s.nyetmsk = 1;
-                               usbc_hcintmsk.s.ackmsk = 1;
-                       }
-                       usbc_hcintmsk.s.nakmsk = 1;
-                       usbc_hcintmsk.s.stallmsk = 1;
-                       usbc_hcintmsk.s.xfercomplmsk = 1;
-               }
-               __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCINTMSKX(channel, usb->index), usbc_hcintmsk.u32);
-
-               /* Enable the channel interrupt to propagate */
-               usbc_haintmsk.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HAINTMSK(usb->index));
-               usbc_haintmsk.s.haintmsk |= 1<<channel;
-               __cvmx_usb_write_csr32(usb, CVMX_USBCX_HAINTMSK(usb->index), usbc_haintmsk.u32);
-       }
-
-       /* Setup the locations the DMA engines use  */
-       {
-               uint64_t dma_address = transaction->buffer + transaction->actual_bytes;
-               if (transaction->type == CVMX_USB_TRANSFER_ISOCHRONOUS)
-                       dma_address = transaction->buffer + transaction->iso_packets[0].offset + transaction->actual_bytes;
-               __cvmx_usb_write_csr64(usb, CVMX_USBNX_DMA0_OUTB_CHN0(usb->index) + channel*8, dma_address);
-               __cvmx_usb_write_csr64(usb, CVMX_USBNX_DMA0_INB_CHN0(usb->index) + channel*8, dma_address);
-       }
-
-       /* Setup both the size of the transfer and the SPLIT characteristics */
-       {
-               union cvmx_usbcx_hcspltx usbc_hcsplt = {.u32 = 0};
-               union cvmx_usbcx_hctsizx usbc_hctsiz = {.u32 = 0};
-               int packets_to_transfer;
-               int bytes_to_transfer = transaction->buffer_length - transaction->actual_bytes;
-
-               /*
-                * ISOCHRONOUS transactions store each individual transfer size
-                * in the packet structure, not the global buffer_length
-                */
-               if (transaction->type == CVMX_USB_TRANSFER_ISOCHRONOUS)
-                       bytes_to_transfer = transaction->iso_packets[0].length - transaction->actual_bytes;
-
-               /*
-                * We need to do split transactions when we are talking to non
-                * high speed devices that are behind a high speed hub
-                */
-               if (__cvmx_usb_pipe_needs_split(usb, pipe)) {
-                       /*
-                        * On the start split phase (stage is even) record the
-                        * frame number we will need to send the split complete.
-                        * We only store the lower two bits since the time ahead
-                        * can only be two frames
-                        */
-                       if ((transaction->stage&1) == 0) {
-                               if (transaction->type == CVMX_USB_TRANSFER_BULK)
-                                       pipe->split_sc_frame = (usb->frame_number + 1) & 0x7f;
-                               else
-                                       pipe->split_sc_frame = (usb->frame_number + 2) & 0x7f;
-                       } else
-                               pipe->split_sc_frame = -1;
-
-                       usbc_hcsplt.s.spltena = 1;
-                       usbc_hcsplt.s.hubaddr = pipe->hub_device_addr;
-                       usbc_hcsplt.s.prtaddr = pipe->hub_port;
-                       usbc_hcsplt.s.compsplt = (transaction->stage == CVMX_USB_STAGE_NON_CONTROL_SPLIT_COMPLETE);
-
-                       /*
-                        * SPLIT transactions can only ever transmit one data
-                        * packet so limit the transfer size to the max packet
-                        * size
-                        */
-                       if (bytes_to_transfer > pipe->max_packet)
-                               bytes_to_transfer = pipe->max_packet;
-
-                       /*
-                        * ISOCHRONOUS OUT splits are unique in that they limit
-                        * data transfers to 188 byte chunks representing the
-                        * begin/middle/end of the data or all
-                        */
-                       if (!usbc_hcsplt.s.compsplt &&
-                               (pipe->transfer_dir == CVMX_USB_DIRECTION_OUT) &&
-                               (pipe->transfer_type == CVMX_USB_TRANSFER_ISOCHRONOUS)) {
-                               /*
-                                * Clear the split complete frame number as
-                                * there isn't going to be a split complete
-                                */
-                               pipe->split_sc_frame = -1;
-                               /*
-                                * See if we've started this transfer and sent
-                                * data
-                                */
-                               if (transaction->actual_bytes == 0) {
-                                       /*
-                                        * Nothing sent yet, this is either a
-                                        * begin or the entire payload
-                                        */
-                                       if (bytes_to_transfer <= 188)
-                                               /* Entire payload in one go */
-                                               usbc_hcsplt.s.xactpos = 3;
-                                       else
-                                               /* First part of payload */
-                                               usbc_hcsplt.s.xactpos = 2;
-                               } else {
-                                       /*
-                                        * Continuing the previous data, we must
-                                        * either be in the middle or at the end
-                                        */
-                                       if (bytes_to_transfer <= 188)
-                                               /* End of payload */
-                                               usbc_hcsplt.s.xactpos = 1;
-                                       else
-                                               /* Middle of payload */
-                                               usbc_hcsplt.s.xactpos = 0;
-                               }
-                               /*
-                                * Again, the transfer size is limited to 188
-                                * bytes
-                                */
-                               if (bytes_to_transfer > 188)
-                                       bytes_to_transfer = 188;
-                       }
-               }
-
-               /*
-                * Make sure the transfer never exceeds the byte limit of the
-                * hardware. Further bytes will be sent as continued
-                * transactions
-                */
-               if (bytes_to_transfer > MAX_TRANSFER_BYTES) {
-                       /*
-                        * Round MAX_TRANSFER_BYTES to a multiple of out packet
-                        * size
-                        */
-                       bytes_to_transfer = MAX_TRANSFER_BYTES / pipe->max_packet;
-                       bytes_to_transfer *= pipe->max_packet;
-               }
-
-               /*
-                * Calculate the number of packets to transfer. If the length is
-                * zero we still need to transfer one packet
-                */
-               packets_to_transfer = (bytes_to_transfer + pipe->max_packet - 1) / pipe->max_packet;
-               if (packets_to_transfer == 0)
-                       packets_to_transfer = 1;
-               else if ((packets_to_transfer > 1) && (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA)) {
-                       /*
-                        * Limit to one packet when not using DMA. Channels must
-                        * be restarted between every packet for IN
-                        * transactions, so there is no reason to do multiple
-                        * packets in a row
-                        */
-                       packets_to_transfer = 1;
-                       bytes_to_transfer = packets_to_transfer * pipe->max_packet;
-               } else if (packets_to_transfer > MAX_TRANSFER_PACKETS) {
-                       /*
-                        * Limit the number of packet and data transferred to
-                        * what the hardware can handle
-                        */
-                       packets_to_transfer = MAX_TRANSFER_PACKETS;
-                       bytes_to_transfer = packets_to_transfer * pipe->max_packet;
-               }
-
-               usbc_hctsiz.s.xfersize = bytes_to_transfer;
-               usbc_hctsiz.s.pktcnt = packets_to_transfer;
-
-               /* Update the DATA0/DATA1 toggle */
-               usbc_hctsiz.s.pid = __cvmx_usb_get_data_pid(pipe);
-               /*
-                * High speed pipes may need a hardware ping before they start
-                */
-               if (pipe->flags & __CVMX_USB_PIPE_FLAGS_NEED_PING)
-                       usbc_hctsiz.s.dopng = 1;
-
-               __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCSPLTX(channel, usb->index), usbc_hcsplt.u32);
-               __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCTSIZX(channel, usb->index), usbc_hctsiz.u32);
-       }
-
-       /* Setup the Host Channel Characteristics Register */
-       {
-               union cvmx_usbcx_hccharx usbc_hcchar = {.u32 = 0};
-
-               /*
-                * Set the startframe odd/even properly. This is only used for
-                * periodic
-                */
-               usbc_hcchar.s.oddfrm = usb->frame_number&1;
-
-               /*
-                * Set the number of back to back packets allowed by this
-                * endpoint. Split transactions interpret "ec" as the number of
-                * immediate retries of failure. These retries happen too
-                * quickly, so we disable these entirely for splits
-                */
-               if (__cvmx_usb_pipe_needs_split(usb, pipe))
-                       usbc_hcchar.s.ec = 1;
-               else if (pipe->multi_count < 1)
-                       usbc_hcchar.s.ec = 1;
-               else if (pipe->multi_count > 3)
-                       usbc_hcchar.s.ec = 3;
-               else
-                       usbc_hcchar.s.ec = pipe->multi_count;
-
-               /* Set the rest of the endpoint specific settings */
-               usbc_hcchar.s.devaddr = pipe->device_addr;
-               usbc_hcchar.s.eptype = transaction->type;
-               usbc_hcchar.s.lspddev = (pipe->device_speed == CVMX_USB_SPEED_LOW);
-               usbc_hcchar.s.epdir = pipe->transfer_dir;
-               usbc_hcchar.s.epnum = pipe->endpoint_num;
-               usbc_hcchar.s.mps = pipe->max_packet;
-               __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCCHARX(channel, usb->index), usbc_hcchar.u32);
-       }
-
-       /* Do transaction type specific fixups as needed */
-       switch (transaction->type) {
-       case CVMX_USB_TRANSFER_CONTROL:
-               __cvmx_usb_start_channel_control(usb, channel, pipe);
-               break;
-       case CVMX_USB_TRANSFER_BULK:
-       case CVMX_USB_TRANSFER_INTERRUPT:
-               break;
-       case CVMX_USB_TRANSFER_ISOCHRONOUS:
-               if (!__cvmx_usb_pipe_needs_split(usb, pipe)) {
-                       /*
-                        * ISO transactions require different PIDs depending on
-                        * direction and how many packets are needed
-                        */
-                       if (pipe->transfer_dir == CVMX_USB_DIRECTION_OUT) {
-                               if (pipe->multi_count < 2) /* Need DATA0 */
-                                       USB_SET_FIELD32(CVMX_USBCX_HCTSIZX(channel, usb->index), union cvmx_usbcx_hctsizx, pid, 0);
-                               else /* Need MDATA */
-                                       USB_SET_FIELD32(CVMX_USBCX_HCTSIZX(channel, usb->index), union cvmx_usbcx_hctsizx, pid, 3);
-                       }
-               }
-               break;
-       }
-       {
-               union cvmx_usbcx_hctsizx usbc_hctsiz = {.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCTSIZX(channel, usb->index))};
-               transaction->xfersize = usbc_hctsiz.s.xfersize;
-               transaction->pktcnt = usbc_hctsiz.s.pktcnt;
-       }
-       /* Remeber when we start a split transaction */
-       if (__cvmx_usb_pipe_needs_split(usb, pipe))
-               usb->active_split = transaction;
-       USB_SET_FIELD32(CVMX_USBCX_HCCHARX(channel, usb->index), union cvmx_usbcx_hccharx, chena, 1);
-       if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA)
-               __cvmx_usb_fill_tx_fifo(usb, channel);
-       return;
-}
-
-
-/**
- * Find a pipe that is ready to be scheduled to hardware.
- * @usb:        USB device state populated by
- *              cvmx_usb_initialize().
- * @list:       Pipe list to search
- * @current_frame:
- *              Frame counter to use as a time reference.
- *
- * Returns: Pipe or NULL if none are ready
- */
-static struct cvmx_usb_pipe *__cvmx_usb_find_ready_pipe(struct cvmx_usb_internal_state *usb, struct cvmx_usb_pipe_list *list, uint64_t current_frame)
-{
-       struct cvmx_usb_pipe *pipe = list->head;
-       while (pipe) {
-               if (!(pipe->flags & __CVMX_USB_PIPE_FLAGS_SCHEDULED) && pipe->head &&
-                       (pipe->next_tx_frame <= current_frame) &&
-                       ((pipe->split_sc_frame == -1) || ((((int)current_frame - (int)pipe->split_sc_frame) & 0x7f) < 0x40)) &&
-                       (!usb->active_split || (usb->active_split == pipe->head))) {
-                       CVMX_PREFETCH(pipe, 128);
-                       CVMX_PREFETCH(pipe->head, 0);
-                       return pipe;
-               }
-               pipe = pipe->next;
-       }
-       return NULL;
-}
-
-
-/**
- * Called whenever a pipe might need to be scheduled to the
- * hardware.
- *
- * @usb:        USB device state populated by
- *              cvmx_usb_initialize().
- * @is_sof:     True if this schedule was called on a SOF interrupt.
- */
-static void __cvmx_usb_schedule(struct cvmx_usb_internal_state *usb, int is_sof)
-{
-       int channel;
-       struct cvmx_usb_pipe *pipe;
-       int need_sof;
-       enum cvmx_usb_transfer ttype;
-
-       if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA) {
-               /*
-                * Without DMA we need to be careful to not schedule something
-                * at the end of a frame and cause an overrun.
-                */
-               union cvmx_usbcx_hfnum hfnum = {.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HFNUM(usb->index))};
-               union cvmx_usbcx_hfir hfir = {.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HFIR(usb->index))};
-               if (hfnum.s.frrem < hfir.s.frint/4)
-                       goto done;
-       }
-
-       while (usb->idle_hardware_channels) {
-               /* Find an idle channel */
-               channel = __fls(usb->idle_hardware_channels);
-               if (unlikely(channel > 7))
-                       break;
-
-               /* Find a pipe needing service */
-               pipe = NULL;
-               if (is_sof) {
-                       /*
-                        * Only process periodic pipes on SOF interrupts. This
-                        * way we are sure that the periodic data is sent in the
-                        * beginning of the frame
-                        */
-                       pipe = __cvmx_usb_find_ready_pipe(usb, usb->active_pipes + CVMX_USB_TRANSFER_ISOCHRONOUS, usb->frame_number);
-                       if (likely(!pipe))
-                               pipe = __cvmx_usb_find_ready_pipe(usb, usb->active_pipes + CVMX_USB_TRANSFER_INTERRUPT, usb->frame_number);
-               }
-               if (likely(!pipe)) {
-                       pipe = __cvmx_usb_find_ready_pipe(usb, usb->active_pipes + CVMX_USB_TRANSFER_CONTROL, usb->frame_number);
-                       if (likely(!pipe))
-                               pipe = __cvmx_usb_find_ready_pipe(usb, usb->active_pipes + CVMX_USB_TRANSFER_BULK, usb->frame_number);
-               }
-               if (!pipe)
-                       break;
-
-               __cvmx_usb_start_channel(usb, channel, pipe);
-       }
-
-done:
-       /*
-        * Only enable SOF interrupts when we have transactions pending in the
-        * future that might need to be scheduled
-        */
-       need_sof = 0;
-       for (ttype = CVMX_USB_TRANSFER_CONTROL; ttype <= CVMX_USB_TRANSFER_INTERRUPT; ttype++) {
-               pipe = usb->active_pipes[ttype].head;
-               while (pipe) {
-                       if (pipe->next_tx_frame > usb->frame_number) {
-                               need_sof = 1;
-                               break;
-                       }
-                       pipe = pipe->next;
-               }
-       }
-       USB_SET_FIELD32(CVMX_USBCX_GINTMSK(usb->index), union cvmx_usbcx_gintmsk, sofmsk, need_sof);
-       return;
-}
-
-
-/**
- * Call a user's callback for a specific reason.
- *
- * @usb:        USB device state populated by
- *              cvmx_usb_initialize().
- * @pipe:       Pipe the callback is for or NULL
- * @transaction:
- *              Transaction the callback is for or NULL
- * @reason:     Reason this callback is being called
- * @complete_code:
- *              Completion code for the transaction, if any
- */
-static void __cvmx_usb_perform_callback(struct cvmx_usb_internal_state *usb,
-                                       struct cvmx_usb_pipe *pipe,
-                                       struct cvmx_usb_transaction *transaction,
-                                       enum cvmx_usb_callback reason,
-                                       enum cvmx_usb_complete complete_code)
-{
-       cvmx_usb_callback_func_t callback = usb->callback[reason];
-       void *user_data = usb->callback_data[reason];
-       int submit_handle = -1;
-       int pipe_handle = -1;
-       int bytes_transferred = 0;
-
-       if (pipe)
-               pipe_handle = __cvmx_usb_get_pipe_handle(usb, pipe);
-
-       if (transaction) {
-               submit_handle = __cvmx_usb_get_submit_handle(usb, transaction);
-               bytes_transferred = transaction->actual_bytes;
-               /* Transactions are allowed to override the default callback */
-               if ((reason == CVMX_USB_CALLBACK_TRANSFER_COMPLETE) && transaction->callback) {
-                       callback = transaction->callback;
-                       user_data = transaction->callback_data;
-               }
-       }
-
-       if (!callback)
-               return;
-
-       callback((struct cvmx_usb_state *)usb, reason, complete_code, pipe_handle, submit_handle,
-                bytes_transferred, user_data);
-}
-
-
-/**
- * Signal the completion of a transaction and free it. The
- * transaction will be removed from the pipe transaction list.
- *
- * @usb:        USB device state populated by
- *              cvmx_usb_initialize().
- * @pipe:       Pipe the transaction is on
- * @transaction:
- *              Transaction that completed
- * @complete_code:
- *              Completion code
- */
-static void __cvmx_usb_perform_complete(struct cvmx_usb_internal_state *usb,
-                                       struct cvmx_usb_pipe *pipe,
-                                       struct cvmx_usb_transaction *transaction,
-                                       enum cvmx_usb_complete complete_code)
-{
-       /* If this was a split then clear our split in progress marker */
-       if (usb->active_split == transaction)
-               usb->active_split = NULL;
-
-       /*
-        * Isochronous transactions need extra processing as they might not be
-        * done after a single data transfer
-        */
-       if (unlikely(transaction->type == CVMX_USB_TRANSFER_ISOCHRONOUS)) {
-               /* Update the number of bytes transferred in this ISO packet */
-               transaction->iso_packets[0].length = transaction->actual_bytes;
-               transaction->iso_packets[0].status = complete_code;
-
-               /*
-                * If there are more ISOs pending and we succeeded, schedule the
-                * next one
-                */
-               if ((transaction->iso_number_packets > 1) && (complete_code == CVMX_USB_COMPLETE_SUCCESS)) {
-                       /* No bytes transferred for this packet as of yet */
-                       transaction->actual_bytes = 0;
-                       /* One less ISO waiting to transfer */
-                       transaction->iso_number_packets--;
-                       /* Increment to the next location in our packet array */
-                       transaction->iso_packets++;
-                       transaction->stage = CVMX_USB_STAGE_NON_CONTROL;
-                       goto done;
-               }
-       }
-
-       /* Remove the transaction from the pipe list */
-       if (transaction->next)
-               transaction->next->prev = transaction->prev;
-       else
-               pipe->tail = transaction->prev;
-       if (transaction->prev)
-               transaction->prev->next = transaction->next;
-       else
-               pipe->head = transaction->next;
-       if (!pipe->head) {
-               __cvmx_usb_remove_pipe(usb->active_pipes + pipe->transfer_type, pipe);
-               __cvmx_usb_append_pipe(&usb->idle_pipes, pipe);
-
-       }
-       __cvmx_usb_perform_callback(usb, pipe, transaction,
-                                   CVMX_USB_CALLBACK_TRANSFER_COMPLETE,
-                                   complete_code);
-       __cvmx_usb_free_transaction(usb, transaction);
-done:
-       return;
-}
-
-
-/**
- * Submit a usb transaction to a pipe. Called for all types
- * of transactions.
- *
- * @usb:
- * @pipe_handle:
- *                 Which pipe to submit to. Will be validated in this function.
- * @type:          Transaction type
- * @buffer:        User buffer for the transaction
- * @buffer_length:
- *                 User buffer's length in bytes
- * @control_header:
- *                 For control transactions, the 8 byte standard header
- * @iso_start_frame:
- *                 For ISO transactions, the start frame
- * @iso_number_packets:
- *                 For ISO, the number of packet in the transaction.
- * @iso_packets:
- *                 A description of each ISO packet
- * @callback:      User callback to call when the transaction completes
- * @user_data:     User's data for the callback
- *
- * Returns: Submit handle or negative on failure. Matches the result
- *         in the external API.
- */
-static int __cvmx_usb_submit_transaction(struct cvmx_usb_internal_state *usb,
-                                        int pipe_handle,
-                                        enum cvmx_usb_transfer type,
-                                        uint64_t buffer,
-                                        int buffer_length,
-                                        uint64_t control_header,
-                                        int iso_start_frame,
-                                        int iso_number_packets,
-                                        struct cvmx_usb_iso_packet *iso_packets,
-                                        cvmx_usb_callback_func_t callback,
-                                        void *user_data)
-{
-       int submit_handle;
-       struct cvmx_usb_transaction *transaction;
-       struct cvmx_usb_pipe *pipe = usb->pipe + pipe_handle;
-
-       if (unlikely((pipe_handle < 0) || (pipe_handle >= MAX_PIPES)))
-               return -EINVAL;
-       /* Fail if the pipe isn't open */
-       if (unlikely((pipe->flags & __CVMX_USB_PIPE_FLAGS_OPEN) == 0))
-               return -EINVAL;
-       if (unlikely(pipe->transfer_type != type))
-               return -EINVAL;
-
-       transaction = __cvmx_usb_alloc_transaction(usb);
-       if (unlikely(!transaction))
-               return -ENOMEM;
-
-       transaction->type = type;
-       transaction->buffer = buffer;
-       transaction->buffer_length = buffer_length;
-       transaction->control_header = control_header;
-       /* FIXME: This is not used, implement it. */
-       transaction->iso_start_frame = iso_start_frame;
-       transaction->iso_number_packets = iso_number_packets;
-       transaction->iso_packets = iso_packets;
-       transaction->callback = callback;
-       transaction->callback_data = user_data;
-       if (transaction->type == CVMX_USB_TRANSFER_CONTROL)
-               transaction->stage = CVMX_USB_STAGE_SETUP;
-       else
-               transaction->stage = CVMX_USB_STAGE_NON_CONTROL;
-
-       transaction->next = NULL;
-       if (pipe->tail) {
-               transaction->prev = pipe->tail;
-               transaction->prev->next = transaction;
-       } else {
-               if (pipe->next_tx_frame < usb->frame_number)
-                       pipe->next_tx_frame = usb->frame_number + pipe->interval -
-                               (usb->frame_number - pipe->next_tx_frame) % pipe->interval;
-               transaction->prev = NULL;
-               pipe->head = transaction;
-               __cvmx_usb_remove_pipe(&usb->idle_pipes, pipe);
-               __cvmx_usb_append_pipe(usb->active_pipes + pipe->transfer_type, pipe);
-       }
-       pipe->tail = transaction;
-
-       submit_handle = __cvmx_usb_get_submit_handle(usb, transaction);
-
-       /* We may need to schedule the pipe if this was the head of the pipe */
-       if (!transaction->prev)
-               __cvmx_usb_schedule(usb, 0);
-
-       return submit_handle;
-}
-
-
-/**
- * Call to submit a USB Bulk transfer to a pipe.
- *
- * @state:         USB device state populated by
- *                 cvmx_usb_initialize().
- * @pipe_handle:
- *                 Handle to the pipe for the transfer.
- * @buffer:        Physical address of the data buffer in
- *                 memory. Note that this is NOT A POINTER, but
- *                 the full 64bit physical address of the
- *                 buffer. This may be zero if buffer_length is
- *                 zero.
- * @buffer_length:
- *                 Length of buffer in bytes.
- * @callback:      Function to call when this transaction
- *                 completes. If the return value of this
- *                 function isn't an error, then this function
- *                 is guaranteed to be called when the
- *                 transaction completes. If this parameter is
- *                 NULL, then the generic callback registered
- *                 through cvmx_usb_register_callback is
- *                 called. If both are NULL, then there is no
- *                 way to know when a transaction completes.
- * @user_data:     User supplied data returned when the
- *                 callback is called. This is only used if
- *                 callback in not NULL.
- *
- * Returns: A submitted transaction handle or negative on
- *         failure. Negative values are error codes.
- */
-int cvmx_usb_submit_bulk(struct cvmx_usb_state *state, int pipe_handle,
-                        uint64_t buffer, int buffer_length,
-                        cvmx_usb_callback_func_t callback,
-                        void *user_data)
-{
-       int submit_handle;
-       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
-
-       /* Pipe handle checking is done later in a common place */
-       if (unlikely(!buffer))
-               return -EINVAL;
-       if (unlikely(buffer_length < 0))
-               return -EINVAL;
-
-       submit_handle = __cvmx_usb_submit_transaction(usb, pipe_handle,
-                                                     CVMX_USB_TRANSFER_BULK,
-                                                     buffer,
-                                                     buffer_length,
-                                                     0, /* control_header */
-                                                     0, /* iso_start_frame */
-                                                     0, /* iso_number_packets */
-                                                     NULL, /* iso_packets */
-                                                     callback,
-                                                     user_data);
-       return submit_handle;
-}
-
-
-/**
- * Call to submit a USB Interrupt transfer to a pipe.
- *
- * @state:         USB device state populated by
- *                 cvmx_usb_initialize().
- * @pipe_handle:
- *                 Handle to the pipe for the transfer.
- * @buffer:        Physical address of the data buffer in
- *                 memory. Note that this is NOT A POINTER, but
- *                 the full 64bit physical address of the
- *                 buffer. This may be zero if buffer_length is
- *                 zero.
- * @buffer_length:
- *                 Length of buffer in bytes.
- * @callback:      Function to call when this transaction
- *                 completes. If the return value of this
- *                 function isn't an error, then this function
- *                 is guaranteed to be called when the
- *                 transaction completes. If this parameter is
- *                 NULL, then the generic callback registered
- *                 through cvmx_usb_register_callback is
- *                 called. If both are NULL, then there is no
- *                 way to know when a transaction completes.
- * @user_data:     User supplied data returned when the
- *                 callback is called. This is only used if
- *                 callback in not NULL.
- *
- * Returns: A submitted transaction handle or negative on
- *         failure. Negative values are error codes.
- */
-int cvmx_usb_submit_interrupt(struct cvmx_usb_state *state, int pipe_handle,
-                             uint64_t buffer, int buffer_length,
-                             cvmx_usb_callback_func_t callback,
-                             void *user_data)
-{
-       int submit_handle;
-       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
-
-       /* Pipe handle checking is done later in a common place */
-       if (unlikely(!buffer))
-               return -EINVAL;
-       if (unlikely(buffer_length < 0))
-               return -EINVAL;
-
-       submit_handle = __cvmx_usb_submit_transaction(usb, pipe_handle,
-                                                     CVMX_USB_TRANSFER_INTERRUPT,
-                                                     buffer,
-                                                     buffer_length,
-                                                     0, /* control_header */
-                                                     0, /* iso_start_frame */
-                                                     0, /* iso_number_packets */
-                                                     NULL, /* iso_packets */
-                                                     callback,
-                                                     user_data);
-       return submit_handle;
-}
-
-
-/**
- * Call to submit a USB Control transfer to a pipe.
- *
- * @state:         USB device state populated by
- *                 cvmx_usb_initialize().
- * @pipe_handle:
- *                 Handle to the pipe for the transfer.
- * @control_header:
- *                 USB 8 byte control header physical address.
- *                 Note that this is NOT A POINTER, but the
- *                 full 64bit physical address of the buffer.
- * @buffer:        Physical address of the data buffer in
- *                 memory. Note that this is NOT A POINTER, but
- *                 the full 64bit physical address of the
- *                 buffer. This may be zero if buffer_length is
- *                 zero.
- * @buffer_length:
- *                 Length of buffer in bytes.
- * @callback:      Function to call when this transaction
- *                 completes. If the return value of this
- *                 function isn't an error, then this function
- *                 is guaranteed to be called when the
- *                 transaction completes. If this parameter is
- *                 NULL, then the generic callback registered
- *                 through cvmx_usb_register_callback is
- *                 called. If both are NULL, then there is no
- *                 way to know when a transaction completes.
- * @user_data:     User supplied data returned when the
- *                 callback is called. This is only used if
- *                 callback in not NULL.
- *
- * Returns: A submitted transaction handle or negative on
- *         failure. Negative values are error codes.
- */
-int cvmx_usb_submit_control(struct cvmx_usb_state *state, int pipe_handle,
-                           uint64_t control_header,
-                           uint64_t buffer, int buffer_length,
-                           cvmx_usb_callback_func_t callback,
-                           void *user_data)
-{
-       int submit_handle;
-       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
-       union cvmx_usb_control_header *header =
-               cvmx_phys_to_ptr(control_header);
-
-       /* Pipe handle checking is done later in a common place */
-       if (unlikely(!control_header))
-               return -EINVAL;
-       /* Some drivers send a buffer with a zero length. God only knows why */
-       if (unlikely(buffer && (buffer_length < 0)))
-               return -EINVAL;
-       if (unlikely(!buffer && (buffer_length != 0)))
-               return -EINVAL;
-       if ((header->s.request_type & 0x80) == 0)
-               buffer_length = le16_to_cpu(header->s.length);
-
-       submit_handle = __cvmx_usb_submit_transaction(usb, pipe_handle,
-                                                     CVMX_USB_TRANSFER_CONTROL,
-                                                     buffer,
-                                                     buffer_length,
-                                                     control_header,
-                                                     0, /* iso_start_frame */
-                                                     0, /* iso_number_packets */
-                                                     NULL, /* iso_packets */
-                                                     callback,
-                                                     user_data);
-       return submit_handle;
-}
-
-
-/**
- * Call to submit a USB Isochronous transfer to a pipe.
- *
- * @state:         USB device state populated by
- *                 cvmx_usb_initialize().
- * @pipe_handle:
- *                 Handle to the pipe for the transfer.
- * @start_frame:
- *                 Number of frames into the future to schedule
- *                 this transaction.
- * @number_packets:
- *                 Number of sequential packets to transfer.
- *                 "packets" is a pointer to an array of this
- *                 many packet structures.
- * @packets:       Description of each transfer packet as
- *                 defined by struct cvmx_usb_iso_packet. The array
- *                 pointed to here must stay valid until the
- *                 complete callback is called.
- * @buffer:        Physical address of the data buffer in
- *                 memory. Note that this is NOT A POINTER, but
- *                 the full 64bit physical address of the
- *                 buffer. This may be zero if buffer_length is
- *                 zero.
- * @buffer_length:
- *                 Length of buffer in bytes.
- * @callback:      Function to call when this transaction
- *                 completes. If the return value of this
- *                 function isn't an error, then this function
- *                 is guaranteed to be called when the
- *                 transaction completes. If this parameter is
- *                 NULL, then the generic callback registered
- *                 through cvmx_usb_register_callback is
- *                 called. If both are NULL, then there is no
- *                 way to know when a transaction completes.
- * @user_data:     User supplied data returned when the
- *                 callback is called. This is only used if
- *                 callback in not NULL.
- *
- * Returns: A submitted transaction handle or negative on
- *         failure. Negative values are error codes.
- */
-int cvmx_usb_submit_isochronous(struct cvmx_usb_state *state, int pipe_handle,
-                               int start_frame,
-                               int number_packets,
-                               struct cvmx_usb_iso_packet packets[],
-                               uint64_t buffer, int buffer_length,
-                               cvmx_usb_callback_func_t callback,
-                               void *user_data)
-{
-       int submit_handle;
-       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
-
-       /* Pipe handle checking is done later in a common place */
-       if (unlikely(start_frame < 0))
-               return -EINVAL;
-       if (unlikely(number_packets < 1))
-               return -EINVAL;
-       if (unlikely(!packets))
-               return -EINVAL;
-       if (unlikely(!buffer))
-               return -EINVAL;
-       if (unlikely(buffer_length < 0))
-               return -EINVAL;
-
-       submit_handle = __cvmx_usb_submit_transaction(usb, pipe_handle,
-                                                     CVMX_USB_TRANSFER_ISOCHRONOUS,
-                                                     buffer,
-                                                     buffer_length,
-                                                     0, /* control_header */
-                                                     start_frame,
-                                                     number_packets,
-                                                     packets,
-                                                     callback,
-                                                     user_data);
-       return submit_handle;
-}
-
-
-/**
- * Cancel one outstanding request in a pipe. Canceling a request
- * can fail if the transaction has already completed before cancel
- * is called. Even after a successful cancel call, it may take
- * a frame or two for the cvmx_usb_poll() function to call the
- * associated callback.
- *
- * @state:      USB device state populated by
- *              cvmx_usb_initialize().
- * @pipe_handle:
- *              Pipe handle to cancel requests in.
- * @submit_handle:
- *              Handle to transaction to cancel, returned by the submit
- *              function.
- *
- * Returns: 0 or a negative error code.
- */
-int cvmx_usb_cancel(struct cvmx_usb_state *state, int pipe_handle, int submit_handle)
-{
-       struct cvmx_usb_transaction *transaction;
-       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
-       struct cvmx_usb_pipe *pipe = usb->pipe + pipe_handle;
-
-       if (unlikely((pipe_handle < 0) || (pipe_handle >= MAX_PIPES)))
-               return -EINVAL;
-       if (unlikely((submit_handle < 0) || (submit_handle >= MAX_TRANSACTIONS)))
-               return -EINVAL;
-
-       /* Fail if the pipe isn't open */
-       if (unlikely((pipe->flags & __CVMX_USB_PIPE_FLAGS_OPEN) == 0))
-               return -EINVAL;
-
-       transaction = usb->transaction + submit_handle;
-
-       /* Fail if this transaction already completed */
-       if (unlikely((transaction->flags & __CVMX_USB_TRANSACTION_FLAGS_IN_USE) == 0))
-               return -EINVAL;
-
-       /*
-        * If the transaction is the HEAD of the queue and scheduled. We need to
-        * treat it special
-        */
-       if ((pipe->head == transaction) &&
-               (pipe->flags & __CVMX_USB_PIPE_FLAGS_SCHEDULED)) {
-               union cvmx_usbcx_hccharx usbc_hcchar;
-
-               usb->pipe_for_channel[pipe->channel] = NULL;
-               pipe->flags &= ~__CVMX_USB_PIPE_FLAGS_SCHEDULED;
-
-               CVMX_SYNCW;
-
-               usbc_hcchar.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCCHARX(pipe->channel, usb->index));
-               /*
-                * If the channel isn't enabled then the transaction already
-                * completed.
-                */
-               if (usbc_hcchar.s.chena) {
-                       usbc_hcchar.s.chdis = 1;
-                       __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCCHARX(pipe->channel, usb->index), usbc_hcchar.u32);
-               }
-       }
-       __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_CANCEL);
-       return 0;
-}
-
-
-/**
- * Cancel all outstanding requests in a pipe. Logically all this
- * does is call cvmx_usb_cancel() in a loop.
- *
- * @state:      USB device state populated by
- *              cvmx_usb_initialize().
- * @pipe_handle:
- *              Pipe handle to cancel requests in.
- *
- * Returns: 0 or a negative error code.
- */
-int cvmx_usb_cancel_all(struct cvmx_usb_state *state, int pipe_handle)
-{
-       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
-       struct cvmx_usb_pipe *pipe = usb->pipe + pipe_handle;
-
-       if (unlikely((pipe_handle < 0) || (pipe_handle >= MAX_PIPES)))
-               return -EINVAL;
-
-       /* Fail if the pipe isn't open */
-       if (unlikely((pipe->flags & __CVMX_USB_PIPE_FLAGS_OPEN) == 0))
-               return -EINVAL;
-
-       /* Simply loop through and attempt to cancel each transaction */
-       while (pipe->head) {
-               int result = cvmx_usb_cancel(state, pipe_handle,
-                       __cvmx_usb_get_submit_handle(usb, pipe->head));
-               if (unlikely(result != 0))
-                       return result;
-       }
-       return 0;
-}
-
-
-/**
- * Close a pipe created with cvmx_usb_open_pipe().
- *
- * @state:      USB device state populated by
- *              cvmx_usb_initialize().
- * @pipe_handle:
- *              Pipe handle to close.
- *
- * Returns: 0 or a negative error code. EBUSY is returned if the pipe has
- *         outstanding transfers.
- */
-int cvmx_usb_close_pipe(struct cvmx_usb_state *state, int pipe_handle)
-{
-       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
-       struct cvmx_usb_pipe *pipe = usb->pipe + pipe_handle;
-
-       if (unlikely((pipe_handle < 0) || (pipe_handle >= MAX_PIPES)))
-               return -EINVAL;
-
-       /* Fail if the pipe isn't open */
-       if (unlikely((pipe->flags & __CVMX_USB_PIPE_FLAGS_OPEN) == 0))
-               return -EINVAL;
-
-       /* Fail if the pipe has pending transactions */
-       if (unlikely(pipe->head))
-               return -EBUSY;
-
-       pipe->flags = 0;
-       __cvmx_usb_remove_pipe(&usb->idle_pipes, pipe);
-       __cvmx_usb_append_pipe(&usb->free_pipes, pipe);
-
-       return 0;
-}
-
-
-/**
- * Register a function to be called when various USB events occur.
- *
- * @state:     USB device state populated by
- *            cvmx_usb_initialize().
- * @reason:    Which event to register for.
- * @callback:  Function to call when the event occurs.
- * @user_data: User data parameter to the function.
- *
- * Returns: 0 or a negative error code.
- */
-int cvmx_usb_register_callback(struct cvmx_usb_state *state,
-                              enum cvmx_usb_callback reason,
-                              cvmx_usb_callback_func_t callback,
-                              void *user_data)
-{
-       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
-
-       if (unlikely(reason >= __CVMX_USB_CALLBACK_END))
-               return -EINVAL;
-       if (unlikely(!callback))
-               return -EINVAL;
-
-       usb->callback[reason] = callback;
-       usb->callback_data[reason] = user_data;
-
-       return 0;
-}
-
-
-/**
- * Get the current USB protocol level frame number. The frame
- * number is always in the range of 0-0x7ff.
- *
- * @state: USB device state populated by
- *        cvmx_usb_initialize().
- *
- * Returns: USB frame number
- */
-int cvmx_usb_get_frame_number(struct cvmx_usb_state *state)
-{
-       int frame_number;
-       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
-       union cvmx_usbcx_hfnum usbc_hfnum;
-
-       usbc_hfnum.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HFNUM(usb->index));
-       frame_number = usbc_hfnum.s.frnum;
-
-       return frame_number;
-}
-
-
-/**
- * Poll a channel for status
- *
- * @usb:     USB device
- * @channel: Channel to poll
- *
- * Returns: Zero on success
- */
-static int __cvmx_usb_poll_channel(struct cvmx_usb_internal_state *usb, int channel)
-{
-       union cvmx_usbcx_hcintx usbc_hcint;
-       union cvmx_usbcx_hctsizx usbc_hctsiz;
-       union cvmx_usbcx_hccharx usbc_hcchar;
-       struct cvmx_usb_pipe *pipe;
-       struct cvmx_usb_transaction *transaction;
-       int bytes_this_transfer;
-       int bytes_in_last_packet;
-       int packets_processed;
-       int buffer_space_left;
-
-       /* Read the interrupt status bits for the channel */
-       usbc_hcint.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCINTX(channel, usb->index));
-
-       if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA) {
-               usbc_hcchar.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCCHARX(channel, usb->index));
-
-               if (usbc_hcchar.s.chena && usbc_hcchar.s.chdis) {
-                       /*
-                        * There seems to be a bug in CN31XX which can cause
-                        * interrupt IN transfers to get stuck until we do a
-                        * write of HCCHARX without changing things
-                        */
-                       __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCCHARX(channel, usb->index), usbc_hcchar.u32);
-                       return 0;
-               }
-
-               /*
-                * In non DMA mode the channels don't halt themselves. We need
-                * to manually disable channels that are left running
-                */
-               if (!usbc_hcint.s.chhltd) {
-                       if (usbc_hcchar.s.chena) {
-                               union cvmx_usbcx_hcintmskx hcintmsk;
-                               /* Disable all interrupts except CHHLTD */
-                               hcintmsk.u32 = 0;
-                               hcintmsk.s.chhltdmsk = 1;
-                               __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCINTMSKX(channel, usb->index), hcintmsk.u32);
-                               usbc_hcchar.s.chdis = 1;
-                               __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCCHARX(channel, usb->index), usbc_hcchar.u32);
-                               return 0;
-                       } else if (usbc_hcint.s.xfercompl) {
-                               /*
-                                * Successful IN/OUT with transfer complete.
-                                * Channel halt isn't needed.
-                                */
-                       } else {
-                               cvmx_dprintf("USB%d: Channel %d interrupt without halt\n", usb->index, channel);
-                               return 0;
-                       }
-               }
-       } else {
-               /*
-                * There is are no interrupts that we need to process when the
-                * channel is still running
-                */
-               if (!usbc_hcint.s.chhltd)
-                       return 0;
-       }
-
-       /* Disable the channel interrupts now that it is done */
-       __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCINTMSKX(channel, usb->index), 0);
-       usb->idle_hardware_channels |= (1<<channel);
-
-       /* Make sure this channel is tied to a valid pipe */
-       pipe = usb->pipe_for_channel[channel];
-       CVMX_PREFETCH(pipe, 0);
-       CVMX_PREFETCH(pipe, 128);
-       if (!pipe)
-               return 0;
-       transaction = pipe->head;
-       CVMX_PREFETCH(transaction, 0);
-
-       /*
-        * Disconnect this pipe from the HW channel. Later the schedule
-        * function will figure out which pipe needs to go
-        */
-       usb->pipe_for_channel[channel] = NULL;
-       pipe->flags &= ~__CVMX_USB_PIPE_FLAGS_SCHEDULED;
-
-       /*
-        * Read the channel config info so we can figure out how much data
-        * transfered
-        */
-       usbc_hcchar.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCCHARX(channel, usb->index));
-       usbc_hctsiz.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCTSIZX(channel, usb->index));
-
-       /*
-        * Calculating the number of bytes successfully transferred is dependent
-        * on the transfer direction
-        */
-       packets_processed = transaction->pktcnt - usbc_hctsiz.s.pktcnt;
-       if (usbc_hcchar.s.epdir) {
-               /*
-                * IN transactions are easy. For every byte received the
-                * hardware decrements xfersize. All we need to do is subtract
-                * the current value of xfersize from its starting value and we
-                * know how many bytes were written to the buffer
-                */
-               bytes_this_transfer = transaction->xfersize - usbc_hctsiz.s.xfersize;
-       } else {
-               /*
-                * OUT transaction don't decrement xfersize. Instead pktcnt is
-                * decremented on every successful packet send. The hardware
-                * does this when it receives an ACK, or NYET. If it doesn't
-                * receive one of these responses pktcnt doesn't change
-                */
-               bytes_this_transfer = packets_processed * usbc_hcchar.s.mps;
-               /*
-                * The last packet may not be a full transfer if we didn't have
-                * enough data
-                */
-               if (bytes_this_transfer > transaction->xfersize)
-                       bytes_this_transfer = transaction->xfersize;
-       }
-       /* Figure out how many bytes were in the last packet of the transfer */
-       if (packets_processed)
-               bytes_in_last_packet = bytes_this_transfer - (packets_processed-1) * usbc_hcchar.s.mps;
-       else
-               bytes_in_last_packet = bytes_this_transfer;
-
-       /*
-        * As a special case, setup transactions output the setup header, not
-        * the user's data. For this reason we don't count setup data as bytes
-        * transferred
-        */
-       if ((transaction->stage == CVMX_USB_STAGE_SETUP) ||
-               (transaction->stage == CVMX_USB_STAGE_SETUP_SPLIT_COMPLETE))
-               bytes_this_transfer = 0;
-
-       /*
-        * Add the bytes transferred to the running total. It is important that
-        * bytes_this_transfer doesn't count any data that needs to be
-        * retransmitted
-        */
-       transaction->actual_bytes += bytes_this_transfer;
-       if (transaction->type == CVMX_USB_TRANSFER_ISOCHRONOUS)
-               buffer_space_left = transaction->iso_packets[0].length - transaction->actual_bytes;
-       else
-               buffer_space_left = transaction->buffer_length - transaction->actual_bytes;
-
-       /*
-        * We need to remember the PID toggle state for the next transaction.
-        * The hardware already updated it for the next transaction
-        */
-       pipe->pid_toggle = !(usbc_hctsiz.s.pid == 0);
-
-       /*
-        * For high speed bulk out, assume the next transaction will need to do
-        * a ping before proceeding. If this isn't true the ACK processing below
-        * will clear this flag
-        */
-       if ((pipe->device_speed == CVMX_USB_SPEED_HIGH) &&
-               (pipe->transfer_type == CVMX_USB_TRANSFER_BULK) &&
-               (pipe->transfer_dir == CVMX_USB_DIRECTION_OUT))
-               pipe->flags |= __CVMX_USB_PIPE_FLAGS_NEED_PING;
-
-       if (usbc_hcint.s.stall) {
-               /*
-                * STALL as a response means this transaction cannot be
-                * completed because the device can't process transactions. Tell
-                * the user. Any data that was transferred will be counted on
-                * the actual bytes transferred
-                */
-               pipe->pid_toggle = 0;
-               __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_STALL);
-       } else if (usbc_hcint.s.xacterr) {
-               /*
-                * We know at least one packet worked if we get a ACK or NAK.
-                * Reset the retry counter
-                */
-               if (usbc_hcint.s.nak || usbc_hcint.s.ack)
-                       transaction->retries = 0;
-               transaction->retries++;
-               if (transaction->retries > MAX_RETRIES) {
-                       /*
-                        * XactErr as a response means the device signaled
-                        * something wrong with the transfer. For example, PID
-                        * toggle errors cause these
-                        */
-                       __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_XACTERR);
-               } else {
-                       /*
-                        * If this was a split then clear our split in progress
-                        * marker
-                        */
-                       if (usb->active_split == transaction)
-                               usb->active_split = NULL;
-                       /*
-                        * Rewind to the beginning of the transaction by anding
-                        * off the split complete bit
-                        */
-                       transaction->stage &= ~1;
-                       pipe->split_sc_frame = -1;
-                       pipe->next_tx_frame += pipe->interval;
-                       if (pipe->next_tx_frame < usb->frame_number)
-                               pipe->next_tx_frame = usb->frame_number + pipe->interval -
-                                                     (usb->frame_number - pipe->next_tx_frame) % pipe->interval;
-               }
-       } else if (usbc_hcint.s.bblerr) {
-               /* Babble Error (BblErr) */
-               __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_BABBLEERR);
-       } else if (usbc_hcint.s.datatglerr) {
-               /* We'll retry the exact same transaction again */
-               transaction->retries++;
-       } else if (usbc_hcint.s.nyet) {
-               /*
-                * NYET as a response is only allowed in three cases: as a
-                * response to a ping, as a response to a split transaction, and
-                * as a response to a bulk out. The ping case is handled by
-                * hardware, so we only have splits and bulk out
-                */
-               if (!__cvmx_usb_pipe_needs_split(usb, pipe)) {
-                       transaction->retries = 0;
-                       /*
-                        * If there is more data to go then we need to try
-                        * again. Otherwise this transaction is complete
-                        */
-                       if ((buffer_space_left == 0) || (bytes_in_last_packet < pipe->max_packet))
-                               __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_SUCCESS);
-               } else {
-                       /*
-                        * Split transactions retry the split complete 4 times
-                        * then rewind to the start split and do the entire
-                        * transactions again
-                        */
-                       transaction->retries++;
-                       if ((transaction->retries & 0x3) == 0) {
-                               /*
-                                * Rewind to the beginning of the transaction by
-                                * anding off the split complete bit
-                                */
-                               transaction->stage &= ~1;
-                               pipe->split_sc_frame = -1;
-                       }
-               }
-       } else if (usbc_hcint.s.ack) {
-               transaction->retries = 0;
-               /*
-                * The ACK bit can only be checked after the other error bits.
-                * This is because a multi packet transfer may succeed in a
-                * number of packets and then get a different response on the
-                * last packet. In this case both ACK and the last response bit
-                * will be set. If none of the other response bits is set, then
-                * the last packet must have been an ACK
-                *
-                * Since we got an ACK, we know we don't need to do a ping on
-                * this pipe
-                */
-               pipe->flags &= ~__CVMX_USB_PIPE_FLAGS_NEED_PING;
-
-               switch (transaction->type) {
-               case CVMX_USB_TRANSFER_CONTROL:
-                       switch (transaction->stage) {
-                       case CVMX_USB_STAGE_NON_CONTROL:
-                       case CVMX_USB_STAGE_NON_CONTROL_SPLIT_COMPLETE:
-                               /* This should be impossible */
-                               __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_ERROR);
-                               break;
-                       case CVMX_USB_STAGE_SETUP:
-                               pipe->pid_toggle = 1;
-                               if (__cvmx_usb_pipe_needs_split(usb, pipe))
-                                       transaction->stage = CVMX_USB_STAGE_SETUP_SPLIT_COMPLETE;
-                               else {
-                                       union cvmx_usb_control_header *header =
-                                               cvmx_phys_to_ptr(transaction->control_header);
-                                       if (header->s.length)
-                                               transaction->stage = CVMX_USB_STAGE_DATA;
-                                       else
-                                               transaction->stage = CVMX_USB_STAGE_STATUS;
-                               }
-                               break;
-                       case CVMX_USB_STAGE_SETUP_SPLIT_COMPLETE:
-                               {
-                                       union cvmx_usb_control_header *header =
-                                               cvmx_phys_to_ptr(transaction->control_header);
-                                       if (header->s.length)
-                                               transaction->stage = CVMX_USB_STAGE_DATA;
-                                       else
-                                               transaction->stage = CVMX_USB_STAGE_STATUS;
-                               }
-                               break;
-                       case CVMX_USB_STAGE_DATA:
-                               if (__cvmx_usb_pipe_needs_split(usb, pipe)) {
-                                       transaction->stage = CVMX_USB_STAGE_DATA_SPLIT_COMPLETE;
-                                       /*
-                                        * For setup OUT data that are splits,
-                                        * the hardware doesn't appear to count
-                                        * transferred data. Here we manually
-                                        * update the data transferred
-                                        */
-                                       if (!usbc_hcchar.s.epdir) {
-                                               if (buffer_space_left < pipe->max_packet)
-                                                       transaction->actual_bytes += buffer_space_left;
-                                               else
-                                                       transaction->actual_bytes += pipe->max_packet;
-                                       }
-                               } else if ((buffer_space_left == 0) || (bytes_in_last_packet < pipe->max_packet)) {
-                                       pipe->pid_toggle = 1;
-                                       transaction->stage = CVMX_USB_STAGE_STATUS;
-                               }
-                               break;
-                       case CVMX_USB_STAGE_DATA_SPLIT_COMPLETE:
-                               if ((buffer_space_left == 0) || (bytes_in_last_packet < pipe->max_packet)) {
-                                       pipe->pid_toggle = 1;
-                                       transaction->stage = CVMX_USB_STAGE_STATUS;
-                               } else {
-                                       transaction->stage = CVMX_USB_STAGE_DATA;
-                               }
-                               break;
-                       case CVMX_USB_STAGE_STATUS:
-                               if (__cvmx_usb_pipe_needs_split(usb, pipe))
-                                       transaction->stage = CVMX_USB_STAGE_STATUS_SPLIT_COMPLETE;
-                               else
-                                       __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_SUCCESS);
-                               break;
-                       case CVMX_USB_STAGE_STATUS_SPLIT_COMPLETE:
-                               __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_SUCCESS);
-                               break;
-                       }
-                       break;
-               case CVMX_USB_TRANSFER_BULK:
-               case CVMX_USB_TRANSFER_INTERRUPT:
-                       /*
-                        * The only time a bulk transfer isn't complete when it
-                        * finishes with an ACK is during a split transaction.
-                        * For splits we need to continue the transfer if more
-                        * data is needed
-                        */
-                       if (__cvmx_usb_pipe_needs_split(usb, pipe)) {
-                               if (transaction->stage == CVMX_USB_STAGE_NON_CONTROL)
-                                       transaction->stage = CVMX_USB_STAGE_NON_CONTROL_SPLIT_COMPLETE;
-                               else {
-                                       if (buffer_space_left && (bytes_in_last_packet == pipe->max_packet))
-                                               transaction->stage = CVMX_USB_STAGE_NON_CONTROL;
-                                       else {
-                                               if (transaction->type == CVMX_USB_TRANSFER_INTERRUPT)
-                                                       pipe->next_tx_frame += pipe->interval;
-                                                       __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_SUCCESS);
-                                       }
-                               }
-                       } else {
-                               if ((pipe->device_speed == CVMX_USB_SPEED_HIGH) &&
-                                   (pipe->transfer_type == CVMX_USB_TRANSFER_BULK) &&
-                                   (pipe->transfer_dir == CVMX_USB_DIRECTION_OUT) &&
-                                   (usbc_hcint.s.nak))
-                                       pipe->flags |= __CVMX_USB_PIPE_FLAGS_NEED_PING;
-                               if (!buffer_space_left || (bytes_in_last_packet < pipe->max_packet)) {
-                                       if (transaction->type == CVMX_USB_TRANSFER_INTERRUPT)
-                                               pipe->next_tx_frame += pipe->interval;
-                                       __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_SUCCESS);
-                               }
-                       }
-                       break;
-               case CVMX_USB_TRANSFER_ISOCHRONOUS:
-                       if (__cvmx_usb_pipe_needs_split(usb, pipe)) {
-                               /*
-                                * ISOCHRONOUS OUT splits don't require a
-                                * complete split stage. Instead they use a
-                                * sequence of begin OUT splits to transfer the
-                                * data 188 bytes at a time. Once the transfer
-                                * is complete, the pipe sleeps until the next
-                                * schedule interval
-                                */
-                               if (pipe->transfer_dir == CVMX_USB_DIRECTION_OUT) {
-                                       /*
-                                        * If no space left or this wasn't a max
-                                        * size packet then this transfer is
-                                        * complete. Otherwise start it again to
-                                        * send the next 188 bytes
-                                        */
-                                       if (!buffer_space_left || (bytes_this_transfer < 188)) {
-                                               pipe->next_tx_frame += pipe->interval;
-                                               __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_SUCCESS);
-                                       }
-                               } else {
-                                       if (transaction->stage == CVMX_USB_STAGE_NON_CONTROL_SPLIT_COMPLETE) {
-                                               /*
-                                                * We are in the incoming data
-                                                * phase. Keep getting data
-                                                * until we run out of space or
-                                                * get a small packet
-                                                */
-                                               if ((buffer_space_left == 0) || (bytes_in_last_packet < pipe->max_packet)) {
-                                                       pipe->next_tx_frame += pipe->interval;
-                                                       __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_SUCCESS);
-                                               }
-                                       } else
-                                               transaction->stage = CVMX_USB_STAGE_NON_CONTROL_SPLIT_COMPLETE;
-                               }
-                       } else {
-                               pipe->next_tx_frame += pipe->interval;
-                               __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_SUCCESS);
-                       }
-                       break;
-               }
-       } else if (usbc_hcint.s.nak) {
-               /*
-                * If this was a split then clear our split in progress marker.
-                */
-               if (usb->active_split == transaction)
-                       usb->active_split = NULL;
-               /*
-                * NAK as a response means the device couldn't accept the
-                * transaction, but it should be retried in the future. Rewind
-                * to the beginning of the transaction by anding off the split
-                * complete bit. Retry in the next interval
-                */
-               transaction->retries = 0;
-               transaction->stage &= ~1;
-               pipe->next_tx_frame += pipe->interval;
-               if (pipe->next_tx_frame < usb->frame_number)
-                       pipe->next_tx_frame = usb->frame_number + pipe->interval -
-                               (usb->frame_number - pipe->next_tx_frame) % pipe->interval;
-       } else {
-               struct cvmx_usb_port_status port;
-               port = cvmx_usb_get_status((struct cvmx_usb_state *)usb);
-               if (port.port_enabled) {
-                       /* We'll retry the exact same transaction again */
-                       transaction->retries++;
-               } else {
-                       /*
-                        * We get channel halted interrupts with no result bits
-                        * sets when the cable is unplugged
-                        */
-                       __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_ERROR);
-               }
-       }
-       return 0;
-}
-
-
-/**
- * Poll the USB block for status and call all needed callback
- * handlers. This function is meant to be called in the interrupt
- * handler for the USB controller. It can also be called
- * periodically in a loop for non-interrupt based operation.
- *
- * @state:     USB device state populated by
- *             cvmx_usb_initialize().
- *
- * Returns: 0 or a negative error code.
- */
-int cvmx_usb_poll(struct cvmx_usb_state *state)
-{
-       union cvmx_usbcx_hfnum usbc_hfnum;
-       union cvmx_usbcx_gintsts usbc_gintsts;
-       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
-
-       CVMX_PREFETCH(usb, 0);
-       CVMX_PREFETCH(usb, 1*128);
-       CVMX_PREFETCH(usb, 2*128);
-       CVMX_PREFETCH(usb, 3*128);
-       CVMX_PREFETCH(usb, 4*128);
-
-       /* Update the frame counter */
-       usbc_hfnum.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HFNUM(usb->index));
-       if ((usb->frame_number&0x3fff) > usbc_hfnum.s.frnum)
-               usb->frame_number += 0x4000;
-       usb->frame_number &= ~0x3fffull;
-       usb->frame_number |= usbc_hfnum.s.frnum;
-
-       /* Read the pending interrupts */
-       usbc_gintsts.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_GINTSTS(usb->index));
-
-       /* Clear the interrupts now that we know about them */
-       __cvmx_usb_write_csr32(usb, CVMX_USBCX_GINTSTS(usb->index), usbc_gintsts.u32);
-
-       if (usbc_gintsts.s.rxflvl) {
-               /*
-                * RxFIFO Non-Empty (RxFLvl)
-                * Indicates that there is at least one packet pending to be
-                * read from the RxFIFO.
-                *
-                * In DMA mode this is handled by hardware
-                */
-               if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA)
-                       __cvmx_usb_poll_rx_fifo(usb);
-       }
-       if (usbc_gintsts.s.ptxfemp || usbc_gintsts.s.nptxfemp) {
-               /* Fill the Tx FIFOs when not in DMA mode */
-               if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA)
-                       __cvmx_usb_poll_tx_fifo(usb);
-       }
-       if (usbc_gintsts.s.disconnint || usbc_gintsts.s.prtint) {
-               union cvmx_usbcx_hprt usbc_hprt;
-               /*
-                * Disconnect Detected Interrupt (DisconnInt)
-                * Asserted when a device disconnect is detected.
-                *
-                * Host Port Interrupt (PrtInt)
-                * The core sets this bit to indicate a change in port status of
-                * one of the O2P USB core ports in Host mode. The application
-                * must read the Host Port Control and Status (HPRT) register to
-                * determine the exact event that caused this interrupt. The
-                * application must clear the appropriate status bit in the Host
-                * Port Control and Status register to clear this bit.
-                *
-                * Call the user's port callback
-                */
-               __cvmx_usb_perform_callback(usb, NULL, NULL,
-                                           CVMX_USB_CALLBACK_PORT_CHANGED,
-                                           CVMX_USB_COMPLETE_SUCCESS);
-               /* Clear the port change bits */
-               usbc_hprt.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HPRT(usb->index));
-               usbc_hprt.s.prtena = 0;
-               __cvmx_usb_write_csr32(usb, CVMX_USBCX_HPRT(usb->index), usbc_hprt.u32);
-       }
-       if (usbc_gintsts.s.hchint) {
-               /*
-                * Host Channels Interrupt (HChInt)
-                * The core sets this bit to indicate that an interrupt is
-                * pending on one of the channels of the core (in Host mode).
-                * The application must read the Host All Channels Interrupt
-                * (HAINT) register to determine the exact number of the channel
-                * on which the interrupt occurred, and then read the
-                * corresponding Host Channel-n Interrupt (HCINTn) register to
-                * determine the exact cause of the interrupt. The application
-                * must clear the appropriate status bit in the HCINTn register
-                * to clear this bit.
-                */
-               union cvmx_usbcx_haint usbc_haint;
-               usbc_haint.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HAINT(usb->index));
-               while (usbc_haint.u32) {
-                       int channel;
-
-                       channel = __fls(usbc_haint.u32);
-                       __cvmx_usb_poll_channel(usb, channel);
-                       usbc_haint.u32 ^= 1<<channel;
-               }
-       }
-
-       __cvmx_usb_schedule(usb, usbc_gintsts.s.sof);
-
-       return 0;
-}
diff --git a/drivers/staging/octeon-usb/cvmx-usb.h b/drivers/staging/octeon-usb/cvmx-usb.h
deleted file mode 100644 (file)
index 7b7a542..0000000
+++ /dev/null
@@ -1,521 +0,0 @@
-/***********************license start***************
- * Copyright (c) 2003-2010  Cavium Networks (support@cavium.com). All rights
- * reserved.
- *
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *   * Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer.
- *
- *   * Redistributions in binary form must reproduce the above
- *     copyright notice, this list of conditions and the following
- *     disclaimer in the documentation and/or other materials provided
- *     with the distribution.
-
- *   * Neither the name of Cavium Networks nor the names of
- *     its contributors may be used to endorse or promote products
- *     derived from this software without specific prior written
- *     permission.
-
- * This Software, including technical data, may be subject to U.S. export
- * control laws, including the U.S. Export Administration Act and its associated
- * regulations, and may be subject to export or import  regulations in other
- * countries.
-
- * TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
- * AND WITH ALL FAULTS AND CAVIUM NETWORKS MAKES NO PROMISES, REPRESENTATIONS OR
- * WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT TO
- * THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY REPRESENTATION
- * OR DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT DEFECTS, AND CAVIUM
- * SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES OF TITLE,
- * MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR PURPOSE, LACK OF
- * VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET POSSESSION OR
- * CORRESPONDENCE TO DESCRIPTION. THE ENTIRE  RISK ARISING OUT OF USE OR
- * PERFORMANCE OF THE SOFTWARE LIES WITH YOU.
- ***********************license end**************************************/
-
-
-/**
- * "cvmx-usb.h" defines a set of low level USB functions to help
- * developers create Octeon USB drivers for various operating
- * systems. These functions provide a generic API to the Octeon
- * USB blocks, hiding the internal hardware specific
- * operations.
- *
- * At a high level the device driver needs to:
- *
- * - Call cvmx_usb_get_num_ports() to get the number of
- *   supported ports.
- * - Call cvmx_usb_initialize() for each Octeon USB port.
- * - Enable the port using cvmx_usb_enable().
- * - Either periodically, or in an interrupt handler, call
- *   cvmx_usb_poll() to service USB events.
- * - Manage pipes using cvmx_usb_open_pipe() and
- *   cvmx_usb_close_pipe().
- * - Manage transfers using cvmx_usb_submit_*() and
- *   cvmx_usb_cancel*().
- * - Shutdown USB on unload using cvmx_usb_shutdown().
- *
- * To monitor USB status changes, the device driver must use
- * cvmx_usb_register_callback() to register for events that it
- * is interested in. Below are a few hints on successfully
- * implementing a driver on top of this API.
- *
- * == Initialization ==
- *
- * When a driver is first loaded, it is normally not necessary
- * to bring up the USB port completely. Most operating systems
- * expect to initialize and enable the port in two independent
- * steps. Normally an operating system will probe hardware,
- * initialize anything found, and then enable the hardware.
- *
- * In the probe phase you should:
- * - Use cvmx_usb_get_num_ports() to determine the number of
- *   USB port to be supported.
- * - Allocate space for a struct cvmx_usb_state for each
- *   port.
- * - Tell the operating system about each port
- *
- * In the initialization phase you should:
- * - Use cvmx_usb_initialize() on each port.
- * - Do not call cvmx_usb_enable(). This leaves the USB port in
- *   the disabled state until the operating system is ready.
- *
- * Finally, in the enable phase you should:
- * - Call cvmx_usb_enable() on the appropriate port.
- * - Note that some operating system use a RESET instead of an
- *   enable call. To implement RESET, you should call
- *   cvmx_usb_disable() followed by cvmx_usb_enable().
- *
- * == Locking ==
- *
- * All of the functions in the cvmx-usb API assume exclusive
- * access to the USB hardware and internal data structures. This
- * means that the driver must provide locking as necessary.
- *
- * In the single CPU state it is normally enough to disable
- * interrupts before every call to cvmx_usb*() and enable them
- * again after the call is complete. Keep in mind that it is
- * very common for the callback handlers to make additional
- * calls into cvmx-usb, so the disable/enable must be protected
- * against recursion. As an example, the Linux kernel
- * local_irq_save() and local_irq_restore() are perfect for this
- * in the non SMP case.
- *
- * In the SMP case, locking is more complicated. For SMP you not
- * only need to disable interrupts on the local core, but also
- * take a lock to make sure that another core cannot call
- * cvmx-usb.
- *
- * == Port callback ==
- *
- * The port callback prototype needs to look as follows:
- *
- * void port_callback(struct cvmx_usb_state *usb,
- *                    enum cvmx_usb_callback reason,
- *                    enum cvmx_usb_complete status,
- *                    int pipe_handle,
- *                    int submit_handle,
- *                    int bytes_transferred,
- *                    void *user_data);
- * - "usb" is the struct cvmx_usb_state for the port.
- * - "reason" will always be CVMX_USB_CALLBACK_PORT_CHANGED.
- * - "status" will always be CVMX_USB_COMPLETE_SUCCESS.
- * - "pipe_handle" will always be -1.
- * - "submit_handle" will always be -1.
- * - "bytes_transferred" will always be 0.
- * - "user_data" is the void pointer originally passed along
- *   with the callback. Use this for any state information you
- *   need.
- *
- * The port callback will be called whenever the user plugs /
- * unplugs a device from the port. It will not be called when a
- * device is plugged / unplugged from a hub connected to the
- * root port. Normally all the callback needs to do is tell the
- * operating system to poll the root hub for status. Under
- * Linux, this is performed by calling usb_hcd_poll_rh_status().
- * In the Linux driver we use "user_data". to pass around the
- * Linux "hcd" structure. Once the port callback completes,
- * Linux automatically calls octeon_usb_hub_status_data() which
- * uses cvmx_usb_get_status() to determine the root port status.
- *
- * == Complete callback ==
- *
- * The completion callback prototype needs to look as follows:
- *
- * void complete_callback(struct cvmx_usb_state *usb,
- *                        enum cvmx_usb_callback reason,
- *                        enum cvmx_usb_complete status,
- *                        int pipe_handle,
- *                        int submit_handle,
- *                        int bytes_transferred,
- *                        void *user_data);
- * - "usb" is the struct cvmx_usb_state for the port.
- * - "reason" will always be CVMX_USB_CALLBACK_TRANSFER_COMPLETE.
- * - "status" will be one of the cvmx_usb_complete enumerations.
- * - "pipe_handle" is the handle to the pipe the transaction
- *   was originally submitted on.
- * - "submit_handle" is the handle returned by the original
- *   cvmx_usb_submit_* call.
- * - "bytes_transferred" is the number of bytes successfully
- *   transferred in the transaction. This will be zero on most
- *   error conditions.
- * - "user_data" is the void pointer originally passed along
- *   with the callback. Use this for any state information you
- *   need. For example, the Linux "urb" is stored in here in the
- *   Linux driver.
- *
- * In general your callback handler should use "status" and
- * "bytes_transferred" to tell the operating system the how the
- * transaction completed. Normally the pipe is not changed in
- * this callback.
- *
- * == Canceling transactions ==
- *
- * When a transaction is cancelled using cvmx_usb_cancel*(), the
- * actual length of time until the complete callback is called
- * can vary greatly. It may be called before cvmx_usb_cancel*()
- * returns, or it may be called a number of usb frames in the
- * future once the hardware frees the transaction. In either of
- * these cases, the complete handler will receive
- * CVMX_USB_COMPLETE_CANCEL.
- *
- * == Handling pipes ==
- *
- * USB "pipes" is a software construct created by this API to
- * enable the ordering of usb transactions to a device endpoint.
- * Octeon's underlying hardware doesn't have any concept
- * equivalent to "pipes". The hardware instead has eight
- * channels that can be used simultaneously to have up to eight
- * transaction in process at the same time. In order to maintain
- * ordering in a pipe, the transactions for a pipe will only be
- * active in one hardware channel at a time. From an API user's
- * perspective, this doesn't matter but it can be helpful to
- * keep this in mind when you are probing hardware while
- * debugging.
- *
- * Also keep in mind that usb transactions contain state
- * information about the previous transaction to the same
- * endpoint. Each transaction has a PID toggle that changes 0/1
- * between each sub packet. This is maintained in the pipe data
- * structures. For this reason, you generally cannot create and
- * destroy a pipe for every transaction. A sequence of
- * transaction to the same endpoint must use the same pipe.
- *
- * == Root Hub ==
- *
- * Some operating systems view the usb root port as a normal usb
- * hub. These systems attempt to control the root hub with
- * messages similar to the usb 2.0 spec for hub control and
- * status. For these systems it may be necessary to write
- * function to decode standard usb control messages into
- * equivalent cvmx-usb API calls.
- *
- * == Interrupts ==
- *
- * If you plan on using usb interrupts, cvmx_usb_poll() must be
- * called on every usb interrupt. It will read the usb state,
- * call any needed callbacks, and schedule transactions as
- * needed. Your device driver needs only to hookup an interrupt
- * handler and call cvmx_usb_poll(). Octeon's usb port 0 causes
- * CIU bit CIU_INT*_SUM0[USB] to be set (bit 56). For port 1,
- * CIU bit CIU_INT_SUM1[USB1] is set (bit 17). How these bits
- * are turned into interrupt numbers is operating system
- * specific. For Linux, there are the convenient defines
- * OCTEON_IRQ_USB0 and OCTEON_IRQ_USB1 for the IRQ numbers.
- *
- * If you aren't using interrupts, simple call cvmx_usb_poll()
- * in your main processing loop.
- */
-
-#ifndef __CVMX_USB_H__
-#define __CVMX_USB_H__
-
-/**
- * enum cvmx_usb_speed - the possible USB device speeds
- *
- * @CVMX_USB_SPEED_HIGH: Device is operation at 480Mbps
- * @CVMX_USB_SPEED_FULL: Device is operation at 12Mbps
- * @CVMX_USB_SPEED_LOW:  Device is operation at 1.5Mbps
- */
-enum cvmx_usb_speed {
-       CVMX_USB_SPEED_HIGH = 0,
-       CVMX_USB_SPEED_FULL = 1,
-       CVMX_USB_SPEED_LOW = 2,
-};
-
-/**
- * enum cvmx_usb_transfer - the possible USB transfer types
- *
- * @CVMX_USB_TRANSFER_CONTROL:    USB transfer type control for hub and status
- *                                transfers
- * @CVMX_USB_TRANSFER_ISOCHRONOUS: USB transfer type isochronous for low
- *                                priority periodic transfers
- * @CVMX_USB_TRANSFER_BULK:       USB transfer type bulk for large low priority
- *                                transfers
- * @CVMX_USB_TRANSFER_INTERRUPT:   USB transfer type interrupt for high priority
- *                                periodic transfers
- */
-enum cvmx_usb_transfer {
-       CVMX_USB_TRANSFER_CONTROL = 0,
-       CVMX_USB_TRANSFER_ISOCHRONOUS = 1,
-       CVMX_USB_TRANSFER_BULK = 2,
-       CVMX_USB_TRANSFER_INTERRUPT = 3,
-};
-
-/**
- * enum cvmx_usb_direction - the transfer directions
- *
- * @CVMX_USB_DIRECTION_OUT: Data is transferring from Octeon to the device/host
- * @CVMX_USB_DIRECTION_IN:  Data is transferring from the device/host to Octeon
- */
-enum cvmx_usb_direction {
-       CVMX_USB_DIRECTION_OUT,
-       CVMX_USB_DIRECTION_IN,
-};
-
-/**
- * enum cvmx_usb_complete - possible callback function status codes
- *
- * @CVMX_USB_COMPLETE_SUCCESS:   The transaction / operation finished without
- *                               any errors
- * @CVMX_USB_COMPLETE_SHORT:     FIXME: This is currently not implemented
- * @CVMX_USB_COMPLETE_CANCEL:    The transaction was canceled while in flight
- *                               by a user call to cvmx_usb_cancel
- * @CVMX_USB_COMPLETE_ERROR:     The transaction aborted with an unexpected
- *                               error status
- * @CVMX_USB_COMPLETE_STALL:     The transaction received a USB STALL response
- *                               from the device
- * @CVMX_USB_COMPLETE_XACTERR:   The transaction failed with an error from the
- *                               device even after a number of retries
- * @CVMX_USB_COMPLETE_DATATGLERR: The transaction failed with a data toggle
- *                               error even after a number of retries
- * @CVMX_USB_COMPLETE_BABBLEERR:  The transaction failed with a babble error
- * @CVMX_USB_COMPLETE_FRAMEERR:          The transaction failed with a frame error
- *                               even after a number of retries
- */
-enum cvmx_usb_complete {
-       CVMX_USB_COMPLETE_SUCCESS,
-       CVMX_USB_COMPLETE_SHORT,
-       CVMX_USB_COMPLETE_CANCEL,
-       CVMX_USB_COMPLETE_ERROR,
-       CVMX_USB_COMPLETE_STALL,
-       CVMX_USB_COMPLETE_XACTERR,
-       CVMX_USB_COMPLETE_DATATGLERR,
-       CVMX_USB_COMPLETE_BABBLEERR,
-       CVMX_USB_COMPLETE_FRAMEERR,
-};
-
-/**
- * struct cvmx_usb_port_status - the USB port status information
- *
- * @port_enabled:      1 = Usb port is enabled, 0 = disabled
- * @port_over_current: 1 = Over current detected, 0 = Over current not
- *                     detected. Octeon doesn't support over current detection.
- * @port_powered:      1 = Port power is being supplied to the device, 0 =
- *                     power is off. Octeon doesn't support turning port power
- *                     off.
- * @port_speed:                Current port speed.
- * @connected:         1 = A device is connected to the port, 0 = No device is
- *                     connected.
- * @connect_change:    1 = Device connected state changed since the last set
- *                     status call.
- */
-struct cvmx_usb_port_status {
-       uint32_t reserved               : 25;
-       uint32_t port_enabled           : 1;
-       uint32_t port_over_current      : 1;
-       uint32_t port_powered           : 1;
-       enum cvmx_usb_speed port_speed  : 2;
-       uint32_t connected              : 1;
-       uint32_t connect_change         : 1;
-};
-
-/**
- * union cvmx_usb_control_header - the structure of a Control packet header
- *
- * @s.request_type:    Bit 7 tells the direction: 1=IN, 0=OUT
- * @s.request          The standard usb request to make
- * @s.value            Value parameter for the request in little endian format
- * @s.index            Index for the request in little endian format
- * @s.length           Length of the data associated with this request in
- *                     little endian format
- */
-union cvmx_usb_control_header {
-       uint64_t u64;
-       struct {
-               uint64_t request_type   : 8;
-               uint64_t request        : 8;
-               uint64_t value          : 16;
-               uint64_t index          : 16;
-               uint64_t length         : 16;
-       } s;
-};
-
-/**
- * struct cvmx_usb_iso_packet - descriptor for Isochronous packets
- *
- * @offset:    This is the offset in bytes into the main buffer where this data
- *             is stored.
- * @length:    This is the length in bytes of the data.
- * @status:    This is the status of this individual packet transfer.
- */
-struct cvmx_usb_iso_packet {
-       int offset;
-       int length;
-       enum cvmx_usb_complete status;
-};
-
-/**
- * enum cvmx_usb_callback - possible callback reasons for the USB API
- *
- * @CVMX_USB_CALLBACK_TRANSFER_COMPLETE: A callback of this type is called when
- *                                      a submitted transfer completes. The
- *                                      completion callback will be called even
- *                                      if the transfer fails or is canceled.
- *                                      The status parameter will contain
- *                                      details of why he callback was called.
- * @CVMX_USB_CALLBACK_PORT_CHANGED:     The status of the port changed. For
- *                                      example, someone may have plugged a
- *                                      device in. The status parameter
- *                                      contains CVMX_USB_COMPLETE_SUCCESS. Use
- *                                      cvmx_usb_get_status() to get the new
- *                                      port status.
- * @__CVMX_USB_CALLBACK_END:            Do not use. Used internally for array
- *                                      bounds.
- */
-enum cvmx_usb_callback {
-       CVMX_USB_CALLBACK_TRANSFER_COMPLETE,
-       CVMX_USB_CALLBACK_PORT_CHANGED,
-       __CVMX_USB_CALLBACK_END
-};
-
-/**
- * USB state internal data. The contents of this structure
- * may change in future SDKs. No data in it should be referenced
- * by user's of this API.
- */
-struct cvmx_usb_state {
-       char data[65536];
-};
-
-/**
- * USB callback functions are always of the following type.
- * The parameters are as follows:
- *      - state = USB device state populated by
- *        cvmx_usb_initialize().
- *      - reason = The enum cvmx_usb_callback used to register
- *        the callback.
- *      - status = The enum cvmx_usb_complete representing the
- *        status code of a transaction.
- *      - pipe_handle = The Pipe that caused this callback, or
- *        -1 if this callback wasn't associated with a pipe.
- *      - submit_handle = Transfer submit handle causing this
- *        callback, or -1 if this callback wasn't associated
- *        with a transfer.
- *      - Actual number of bytes transfer.
- *      - user_data = The user pointer supplied to the
- *        function cvmx_usb_submit() or
- *        cvmx_usb_register_callback() */
-typedef void (*cvmx_usb_callback_func_t)(struct cvmx_usb_state *state,
-                                         enum cvmx_usb_callback reason,
-                                         enum cvmx_usb_complete status,
-                                         int pipe_handle, int submit_handle,
-                                         int bytes_transferred, void *user_data);
-
-/**
- * enum cvmx_usb_initialize_flags - flags used by the initialization function
- *
- * @CVMX_USB_INITIALIZE_FLAGS_CLOCK_XO_XI:    The USB port uses a 12MHz crystal
- *                                           as clock source at USB_XO and
- *                                           USB_XI.
- * @CVMX_USB_INITIALIZE_FLAGS_CLOCK_XO_GND:   The USB port uses 12/24/48MHz 2.5V
- *                                           board clock source at USB_XO.
- *                                           USB_XI should be tied to GND.
- * @CVMX_USB_INITIALIZE_FLAGS_CLOCK_MHZ_MASK: Mask for clock speed field
- * @CVMX_USB_INITIALIZE_FLAGS_CLOCK_12MHZ:    Speed of reference clock or
- *                                           crystal
- * @CVMX_USB_INITIALIZE_FLAGS_CLOCK_24MHZ:    Speed of reference clock
- * @CVMX_USB_INITIALIZE_FLAGS_CLOCK_48MHZ:    Speed of reference clock
- * @CVMX_USB_INITIALIZE_FLAGS_NO_DMA:        Disable DMA and used polled IO for
- *                                           data transfer use for the USB
- */
-enum cvmx_usb_initialize_flags {
-       CVMX_USB_INITIALIZE_FLAGS_CLOCK_XO_XI           = 1 << 0,
-       CVMX_USB_INITIALIZE_FLAGS_CLOCK_XO_GND          = 1 << 1,
-       CVMX_USB_INITIALIZE_FLAGS_CLOCK_MHZ_MASK        = 3 << 3,
-       CVMX_USB_INITIALIZE_FLAGS_CLOCK_12MHZ           = 1 << 3,
-       CVMX_USB_INITIALIZE_FLAGS_CLOCK_24MHZ           = 2 << 3,
-       CVMX_USB_INITIALIZE_FLAGS_CLOCK_48MHZ           = 3 << 3,
-       /* Bits 3-4 used to encode the clock frequency */
-       CVMX_USB_INITIALIZE_FLAGS_NO_DMA                = 1 << 5,
-};
-
-/**
- * enum cvmx_usb_pipe_flags - internal flags for a pipe.
- *
- * @__CVMX_USB_PIPE_FLAGS_OPEN:             Used internally to determine if a pipe is
- *                                  open. Do not use.
- * @__CVMX_USB_PIPE_FLAGS_SCHEDULED: Used internally to determine if a pipe is
- *                                  actively using hardware. Do not use.
- * @__CVMX_USB_PIPE_FLAGS_NEED_PING: Used internally to determine if a high
- *                                  speed pipe is in the ping state. Do not
- *                                  use.
- */
-enum cvmx_usb_pipe_flags {
-       __CVMX_USB_PIPE_FLAGS_OPEN      = 1 << 16,
-       __CVMX_USB_PIPE_FLAGS_SCHEDULED = 1 << 17,
-       __CVMX_USB_PIPE_FLAGS_NEED_PING = 1 << 18,
-};
-
-extern int cvmx_usb_get_num_ports(void);
-extern int cvmx_usb_initialize(struct cvmx_usb_state *state,
-                              int usb_port_number);
-extern int cvmx_usb_shutdown(struct cvmx_usb_state *state);
-extern int cvmx_usb_enable(struct cvmx_usb_state *state);
-extern int cvmx_usb_disable(struct cvmx_usb_state *state);
-extern struct cvmx_usb_port_status cvmx_usb_get_status(struct cvmx_usb_state *state);
-extern void cvmx_usb_set_status(struct cvmx_usb_state *state, struct cvmx_usb_port_status port_status);
-extern int cvmx_usb_open_pipe(struct cvmx_usb_state *state,
-                              int device_addr, int endpoint_num,
-                              enum cvmx_usb_speed device_speed, int max_packet,
-                              enum cvmx_usb_transfer transfer_type,
-                              enum cvmx_usb_direction transfer_dir, int interval,
-                              int multi_count, int hub_device_addr,
-                              int hub_port);
-extern int cvmx_usb_submit_bulk(struct cvmx_usb_state *state, int pipe_handle,
-                                uint64_t buffer, int buffer_length,
-                                cvmx_usb_callback_func_t callback,
-                                void *user_data);
-extern int cvmx_usb_submit_interrupt(struct cvmx_usb_state *state, int pipe_handle,
-                                     uint64_t buffer, int buffer_length,
-                                     cvmx_usb_callback_func_t callback,
-                                     void *user_data);
-extern int cvmx_usb_submit_control(struct cvmx_usb_state *state, int pipe_handle,
-                                   uint64_t control_header,
-                                   uint64_t buffer, int buffer_length,
-                                   cvmx_usb_callback_func_t callback,
-                                   void *user_data);
-
-extern int cvmx_usb_submit_isochronous(struct cvmx_usb_state *state, int pipe_handle,
-                                      int start_frame,
-                                       int number_packets,
-                                       struct cvmx_usb_iso_packet packets[],
-                                       uint64_t buffer, int buffer_length,
-                                       cvmx_usb_callback_func_t callback,
-                                       void *user_data);
-extern int cvmx_usb_cancel(struct cvmx_usb_state *state, int pipe_handle,
-                          int submit_handle);
-extern int cvmx_usb_cancel_all(struct cvmx_usb_state *state, int pipe_handle);
-extern int cvmx_usb_close_pipe(struct cvmx_usb_state *state, int pipe_handle);
-extern int cvmx_usb_register_callback(struct cvmx_usb_state *state,
-                                     enum cvmx_usb_callback reason,
-                                     cvmx_usb_callback_func_t callback,
-                                     void *user_data);
-extern int cvmx_usb_get_frame_number(struct cvmx_usb_state *state);
-extern int cvmx_usb_poll(struct cvmx_usb_state *state);
-
-#endif  /* __CVMX_USB_H__ */
index 764a8df0a16e8d317681e96b39e60e4a0e9b7c9b..478a903f2bce505a92ee10b4d61a39f41403ed6e 100644 (file)
@@ -4,6 +4,44 @@
  * for more details.
  *
  * Copyright (C) 2008 Cavium Networks
+ *
+ * Some parts of the code were originally released under BSD license:
+ *
+ * Copyright (c) 2003-2010 Cavium Networks (support@cavium.com). All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *
+ *   * Redistributions in binary form must reproduce the above
+ *     copyright notice, this list of conditions and the following
+ *     disclaimer in the documentation and/or other materials provided
+ *     with the distribution.
+ *
+ *   * Neither the name of Cavium Networks nor the names of
+ *     its contributors may be used to endorse or promote products
+ *     derived from this software without specific prior written
+ *     permission.
+ *
+ * This Software, including technical data, may be subject to U.S. export
+ * control laws, including the U.S. Export Administration Act and its associated
+ * regulations, and may be subject to export or import regulations in other
+ * countries.
+ *
+ * TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
+ * AND WITH ALL FAULTS AND CAVIUM NETWORKS MAKES NO PROMISES, REPRESENTATIONS OR
+ * WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT TO
+ * THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY REPRESENTATION
+ * OR DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT DEFECTS, AND CAVIUM
+ * SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES OF TITLE,
+ * MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR PURPOSE, LACK OF
+ * VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET POSSESSION OR
+ * CORRESPONDENCE TO DESCRIPTION. THE ENTIRE RISK ARISING OUT OF USE OR
+ * PERFORMANCE OF THE SOFTWARE LIES WITH YOU.
  */
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/delay.h>
 
 #include <asm/octeon/cvmx.h>
-#include "cvmx-usb.h"
 #include <asm/octeon/cvmx-iob-defs.h>
 
 #include <linux/usb/hcd.h>
 
 #include <linux/err.h>
 
+#include <asm/octeon/octeon.h>
+#include <asm/octeon/cvmx-helper.h>
+#include <asm/octeon/cvmx-sysinfo.h>
+#include <asm/octeon/cvmx-helper-board.h>
+
+#include "cvmx-usbcx-defs.h"
+#include "cvmx-usbnx-defs.h"
+
+/**
+ * enum cvmx_usb_speed - the possible USB device speeds
+ *
+ * @CVMX_USB_SPEED_HIGH: Device is operation at 480Mbps
+ * @CVMX_USB_SPEED_FULL: Device is operation at 12Mbps
+ * @CVMX_USB_SPEED_LOW:  Device is operation at 1.5Mbps
+ */
+enum cvmx_usb_speed {
+       CVMX_USB_SPEED_HIGH = 0,
+       CVMX_USB_SPEED_FULL = 1,
+       CVMX_USB_SPEED_LOW = 2,
+};
+
+/**
+ * enum cvmx_usb_transfer - the possible USB transfer types
+ *
+ * @CVMX_USB_TRANSFER_CONTROL:    USB transfer type control for hub and status
+ *                                transfers
+ * @CVMX_USB_TRANSFER_ISOCHRONOUS: USB transfer type isochronous for low
+ *                                priority periodic transfers
+ * @CVMX_USB_TRANSFER_BULK:       USB transfer type bulk for large low priority
+ *                                transfers
+ * @CVMX_USB_TRANSFER_INTERRUPT:   USB transfer type interrupt for high priority
+ *                                periodic transfers
+ */
+enum cvmx_usb_transfer {
+       CVMX_USB_TRANSFER_CONTROL = 0,
+       CVMX_USB_TRANSFER_ISOCHRONOUS = 1,
+       CVMX_USB_TRANSFER_BULK = 2,
+       CVMX_USB_TRANSFER_INTERRUPT = 3,
+};
+
+/**
+ * enum cvmx_usb_direction - the transfer directions
+ *
+ * @CVMX_USB_DIRECTION_OUT: Data is transferring from Octeon to the device/host
+ * @CVMX_USB_DIRECTION_IN:  Data is transferring from the device/host to Octeon
+ */
+enum cvmx_usb_direction {
+       CVMX_USB_DIRECTION_OUT,
+       CVMX_USB_DIRECTION_IN,
+};
+
+/**
+ * enum cvmx_usb_complete - possible callback function status codes
+ *
+ * @CVMX_USB_COMPLETE_SUCCESS:   The transaction / operation finished without
+ *                               any errors
+ * @CVMX_USB_COMPLETE_SHORT:     FIXME: This is currently not implemented
+ * @CVMX_USB_COMPLETE_CANCEL:    The transaction was canceled while in flight
+ *                               by a user call to cvmx_usb_cancel
+ * @CVMX_USB_COMPLETE_ERROR:     The transaction aborted with an unexpected
+ *                               error status
+ * @CVMX_USB_COMPLETE_STALL:     The transaction received a USB STALL response
+ *                               from the device
+ * @CVMX_USB_COMPLETE_XACTERR:   The transaction failed with an error from the
+ *                               device even after a number of retries
+ * @CVMX_USB_COMPLETE_DATATGLERR: The transaction failed with a data toggle
+ *                               error even after a number of retries
+ * @CVMX_USB_COMPLETE_BABBLEERR:  The transaction failed with a babble error
+ * @CVMX_USB_COMPLETE_FRAMEERR:          The transaction failed with a frame error
+ *                               even after a number of retries
+ */
+enum cvmx_usb_complete {
+       CVMX_USB_COMPLETE_SUCCESS,
+       CVMX_USB_COMPLETE_SHORT,
+       CVMX_USB_COMPLETE_CANCEL,
+       CVMX_USB_COMPLETE_ERROR,
+       CVMX_USB_COMPLETE_STALL,
+       CVMX_USB_COMPLETE_XACTERR,
+       CVMX_USB_COMPLETE_DATATGLERR,
+       CVMX_USB_COMPLETE_BABBLEERR,
+       CVMX_USB_COMPLETE_FRAMEERR,
+};
+
+/**
+ * struct cvmx_usb_port_status - the USB port status information
+ *
+ * @port_enabled:      1 = Usb port is enabled, 0 = disabled
+ * @port_over_current: 1 = Over current detected, 0 = Over current not
+ *                     detected. Octeon doesn't support over current detection.
+ * @port_powered:      1 = Port power is being supplied to the device, 0 =
+ *                     power is off. Octeon doesn't support turning port power
+ *                     off.
+ * @port_speed:                Current port speed.
+ * @connected:         1 = A device is connected to the port, 0 = No device is
+ *                     connected.
+ * @connect_change:    1 = Device connected state changed since the last set
+ *                     status call.
+ */
+struct cvmx_usb_port_status {
+       uint32_t reserved               : 25;
+       uint32_t port_enabled           : 1;
+       uint32_t port_over_current      : 1;
+       uint32_t port_powered           : 1;
+       enum cvmx_usb_speed port_speed  : 2;
+       uint32_t connected              : 1;
+       uint32_t connect_change         : 1;
+};
+
+/**
+ * union cvmx_usb_control_header - the structure of a Control packet header
+ *
+ * @s.request_type:    Bit 7 tells the direction: 1=IN, 0=OUT
+ * @s.request          The standard usb request to make
+ * @s.value            Value parameter for the request in little endian format
+ * @s.index            Index for the request in little endian format
+ * @s.length           Length of the data associated with this request in
+ *                     little endian format
+ */
+union cvmx_usb_control_header {
+       uint64_t u64;
+       struct {
+               uint64_t request_type   : 8;
+               uint64_t request        : 8;
+               uint64_t value          : 16;
+               uint64_t index          : 16;
+               uint64_t length         : 16;
+       } s;
+};
+
+/**
+ * struct cvmx_usb_iso_packet - descriptor for Isochronous packets
+ *
+ * @offset:    This is the offset in bytes into the main buffer where this data
+ *             is stored.
+ * @length:    This is the length in bytes of the data.
+ * @status:    This is the status of this individual packet transfer.
+ */
+struct cvmx_usb_iso_packet {
+       int offset;
+       int length;
+       enum cvmx_usb_complete status;
+};
+
+/**
+ * enum cvmx_usb_callback - possible callback reasons for the USB API
+ *
+ * @CVMX_USB_CALLBACK_TRANSFER_COMPLETE: A callback of this type is called when
+ *                                      a submitted transfer completes. The
+ *                                      completion callback will be called even
+ *                                      if the transfer fails or is canceled.
+ *                                      The status parameter will contain
+ *                                      details of why he callback was called.
+ * @CVMX_USB_CALLBACK_PORT_CHANGED:     The status of the port changed. For
+ *                                      example, someone may have plugged a
+ *                                      device in. The status parameter
+ *                                      contains CVMX_USB_COMPLETE_SUCCESS. Use
+ *                                      cvmx_usb_get_status() to get the new
+ *                                      port status.
+ * @__CVMX_USB_CALLBACK_END:            Do not use. Used internally for array
+ *                                      bounds.
+ */
+enum cvmx_usb_callback {
+       CVMX_USB_CALLBACK_TRANSFER_COMPLETE,
+       CVMX_USB_CALLBACK_PORT_CHANGED,
+       __CVMX_USB_CALLBACK_END
+};
+
+/**
+ * USB state internal data. The contents of this structure
+ * may change in future SDKs. No data in it should be referenced
+ * by user's of this API.
+ */
+struct cvmx_usb_state {
+       char data[65536];
+};
+
+/**
+ * USB callback functions are always of the following type.
+ * The parameters are as follows:
+ *      - state = USB device state populated by
+ *        cvmx_usb_initialize().
+ *      - reason = The enum cvmx_usb_callback used to register
+ *        the callback.
+ *      - status = The enum cvmx_usb_complete representing the
+ *        status code of a transaction.
+ *      - pipe_handle = The Pipe that caused this callback, or
+ *        -1 if this callback wasn't associated with a pipe.
+ *      - submit_handle = Transfer submit handle causing this
+ *        callback, or -1 if this callback wasn't associated
+ *        with a transfer.
+ *      - Actual number of bytes transfer.
+ *      - user_data = The user pointer supplied to the
+ *        function cvmx_usb_submit() or
+ *        cvmx_usb_register_callback() */
+typedef void (*cvmx_usb_callback_func_t)(struct cvmx_usb_state *state,
+                                         enum cvmx_usb_callback reason,
+                                         enum cvmx_usb_complete status,
+                                         int pipe_handle, int submit_handle,
+                                         int bytes_transferred, void *user_data);
+
+/**
+ * enum cvmx_usb_initialize_flags - flags used by the initialization function
+ *
+ * @CVMX_USB_INITIALIZE_FLAGS_CLOCK_XO_XI:    The USB port uses a 12MHz crystal
+ *                                           as clock source at USB_XO and
+ *                                           USB_XI.
+ * @CVMX_USB_INITIALIZE_FLAGS_CLOCK_XO_GND:   The USB port uses 12/24/48MHz 2.5V
+ *                                           board clock source at USB_XO.
+ *                                           USB_XI should be tied to GND.
+ * @CVMX_USB_INITIALIZE_FLAGS_CLOCK_MHZ_MASK: Mask for clock speed field
+ * @CVMX_USB_INITIALIZE_FLAGS_CLOCK_12MHZ:    Speed of reference clock or
+ *                                           crystal
+ * @CVMX_USB_INITIALIZE_FLAGS_CLOCK_24MHZ:    Speed of reference clock
+ * @CVMX_USB_INITIALIZE_FLAGS_CLOCK_48MHZ:    Speed of reference clock
+ * @CVMX_USB_INITIALIZE_FLAGS_NO_DMA:        Disable DMA and used polled IO for
+ *                                           data transfer use for the USB
+ */
+enum cvmx_usb_initialize_flags {
+       CVMX_USB_INITIALIZE_FLAGS_CLOCK_XO_XI           = 1 << 0,
+       CVMX_USB_INITIALIZE_FLAGS_CLOCK_XO_GND          = 1 << 1,
+       CVMX_USB_INITIALIZE_FLAGS_CLOCK_MHZ_MASK        = 3 << 3,
+       CVMX_USB_INITIALIZE_FLAGS_CLOCK_12MHZ           = 1 << 3,
+       CVMX_USB_INITIALIZE_FLAGS_CLOCK_24MHZ           = 2 << 3,
+       CVMX_USB_INITIALIZE_FLAGS_CLOCK_48MHZ           = 3 << 3,
+       /* Bits 3-4 used to encode the clock frequency */
+       CVMX_USB_INITIALIZE_FLAGS_NO_DMA                = 1 << 5,
+};
+
+/**
+ * enum cvmx_usb_pipe_flags - internal flags for a pipe.
+ *
+ * @__CVMX_USB_PIPE_FLAGS_OPEN:             Used internally to determine if a pipe is
+ *                                  open. Do not use.
+ * @__CVMX_USB_PIPE_FLAGS_SCHEDULED: Used internally to determine if a pipe is
+ *                                  actively using hardware. Do not use.
+ * @__CVMX_USB_PIPE_FLAGS_NEED_PING: Used internally to determine if a high
+ *                                  speed pipe is in the ping state. Do not
+ *                                  use.
+ */
+enum cvmx_usb_pipe_flags {
+       __CVMX_USB_PIPE_FLAGS_OPEN      = 1 << 16,
+       __CVMX_USB_PIPE_FLAGS_SCHEDULED = 1 << 17,
+       __CVMX_USB_PIPE_FLAGS_NEED_PING = 1 << 18,
+};
+
+/* Normal prefetch that use the pref instruction. */
+#define CVMX_PREFETCH(address, offset) asm volatile ("pref %[type], %[off](%[rbase])" : : [rbase] "d" (address), [off] "I" (offset), [type] "n" (0))
+
+/* Maximum number of times to retry failed transactions */
+#define MAX_RETRIES            3
+
+/* Maximum number of pipes that can be open at once */
+#define MAX_PIPES              32
+
+/* Maximum number of outstanding transactions across all pipes */
+#define MAX_TRANSACTIONS       256
+
+/* Maximum number of hardware channels supported by the USB block */
+#define MAX_CHANNELS           8
+
+/* The highest valid USB device address */
+#define MAX_USB_ADDRESS                127
+
+/* The highest valid USB endpoint number */
+#define MAX_USB_ENDPOINT       15
+
+/* The highest valid port number on a hub */
+#define MAX_USB_HUB_PORT       15
+
+/*
+ * The low level hardware can transfer a maximum of this number of bytes in each
+ * transfer. The field is 19 bits wide
+ */
+#define MAX_TRANSFER_BYTES     ((1<<19)-1)
+
+/*
+ * The low level hardware can transfer a maximum of this number of packets in
+ * each transfer. The field is 10 bits wide
+ */
+#define MAX_TRANSFER_PACKETS   ((1<<10)-1)
+
+enum cvmx_usb_transaction_flags {
+       __CVMX_USB_TRANSACTION_FLAGS_IN_USE = 1<<16,
+};
+
+enum {
+       USB_CLOCK_TYPE_REF_12,
+       USB_CLOCK_TYPE_REF_24,
+       USB_CLOCK_TYPE_REF_48,
+       USB_CLOCK_TYPE_CRYSTAL_12,
+};
+
+/**
+ * Logical transactions may take numerous low level
+ * transactions, especially when splits are concerned. This
+ * enum represents all of the possible stages a transaction can
+ * be in. Note that split completes are always even. This is so
+ * the NAK handler can backup to the previous low level
+ * transaction with a simple clearing of bit 0.
+ */
+enum cvmx_usb_stage {
+       CVMX_USB_STAGE_NON_CONTROL,
+       CVMX_USB_STAGE_NON_CONTROL_SPLIT_COMPLETE,
+       CVMX_USB_STAGE_SETUP,
+       CVMX_USB_STAGE_SETUP_SPLIT_COMPLETE,
+       CVMX_USB_STAGE_DATA,
+       CVMX_USB_STAGE_DATA_SPLIT_COMPLETE,
+       CVMX_USB_STAGE_STATUS,
+       CVMX_USB_STAGE_STATUS_SPLIT_COMPLETE,
+};
+
+/**
+ * struct cvmx_usb_transaction - describes each pending USB transaction
+ *                              regardless of type. These are linked together
+ *                              to form a list of pending requests for a pipe.
+ *
+ * @prev:              Transaction before this one in the pipe.
+ * @next:              Transaction after this one in the pipe.
+ * @type:              Type of transaction, duplicated of the pipe.
+ * @flags:             State flags for this transaction.
+ * @buffer:            User's physical buffer address to read/write.
+ * @buffer_length:     Size of the user's buffer in bytes.
+ * @control_header:    For control transactions, physical address of the 8
+ *                     byte standard header.
+ * @iso_start_frame:   For ISO transactions, the starting frame number.
+ * @iso_number_packets:        For ISO transactions, the number of packets in the
+ *                     request.
+ * @iso_packets:       For ISO transactions, the sub packets in the request.
+ * @actual_bytes:      Actual bytes transfer for this transaction.
+ * @stage:             For control transactions, the current stage.
+ * @callback:          User's callback function when complete.
+ * @callback_data:     User's data.
+ */
+struct cvmx_usb_transaction {
+       struct cvmx_usb_transaction *prev;
+       struct cvmx_usb_transaction *next;
+       enum cvmx_usb_transfer type;
+       enum cvmx_usb_transaction_flags flags;
+       uint64_t buffer;
+       int buffer_length;
+       uint64_t control_header;
+       int iso_start_frame;
+       int iso_number_packets;
+       struct cvmx_usb_iso_packet *iso_packets;
+       int xfersize;
+       int pktcnt;
+       int retries;
+       int actual_bytes;
+       enum cvmx_usb_stage stage;
+       cvmx_usb_callback_func_t callback;
+       void *callback_data;
+};
+
+/**
+ * struct cvmx_usb_pipe - a pipe represents a virtual connection between Octeon
+ *                       and some USB device. It contains a list of pending
+ *                       request to the device.
+ *
+ * @prev:              Pipe before this one in the list
+ * @next:              Pipe after this one in the list
+ * @head:              The first pending transaction
+ * @tail:              The last pending transaction
+ * @interval:          For periodic pipes, the interval between packets in
+ *                     frames
+ * @next_tx_frame:     The next frame this pipe is allowed to transmit on
+ * @flags:             State flags for this pipe
+ * @device_speed:      Speed of device connected to this pipe
+ * @transfer_type:     Type of transaction supported by this pipe
+ * @transfer_dir:      IN or OUT. Ignored for Control
+ * @multi_count:       Max packet in a row for the device
+ * @max_packet:                The device's maximum packet size in bytes
+ * @device_addr:       USB device address at other end of pipe
+ * @endpoint_num:      USB endpoint number at other end of pipe
+ * @hub_device_addr:   Hub address this device is connected to
+ * @hub_port:          Hub port this device is connected to
+ * @pid_toggle:                This toggles between 0/1 on every packet send to track
+ *                     the data pid needed
+ * @channel:           Hardware DMA channel for this pipe
+ * @split_sc_frame:    The low order bits of the frame number the split
+ *                     complete should be sent on
+ */
+struct cvmx_usb_pipe {
+       struct cvmx_usb_pipe *prev;
+       struct cvmx_usb_pipe *next;
+       struct cvmx_usb_transaction *head;
+       struct cvmx_usb_transaction *tail;
+       uint64_t interval;
+       uint64_t next_tx_frame;
+       enum cvmx_usb_pipe_flags flags;
+       enum cvmx_usb_speed device_speed;
+       enum cvmx_usb_transfer transfer_type;
+       enum cvmx_usb_direction transfer_dir;
+       int multi_count;
+       uint16_t max_packet;
+       uint8_t device_addr;
+       uint8_t endpoint_num;
+       uint8_t hub_device_addr;
+       uint8_t hub_port;
+       uint8_t pid_toggle;
+       uint8_t channel;
+       int8_t split_sc_frame;
+};
+
+/**
+ * struct cvmx_usb_pipe_list
+ *
+ * @head: Head of the list, or NULL if empty.
+ * @tail: Tail if the list, or NULL if empty.
+ */
+struct cvmx_usb_pipe_list {
+       struct cvmx_usb_pipe *head;
+       struct cvmx_usb_pipe *tail;
+};
+
+struct cvmx_usb_tx_fifo {
+       struct {
+               int channel;
+               int size;
+               uint64_t address;
+       } entry[MAX_CHANNELS+1];
+       int head;
+       int tail;
+};
+
+/**
+ * struct cvmx_usb_internal_state - the state of the USB block
+ *
+ * init_flags:            Flags passed to initialize.
+ * index:                 Which USB block this is for.
+ * idle_hardware_channels: Bit set for every idle hardware channel.
+ * usbcx_hprt:            Stored port status so we don't need to read a CSR to
+ *                        determine splits.
+ * pipe_for_channel:      Map channels to pipes.
+ * free_transaction_head:  List of free transactions head.
+ * free_transaction_tail:  List of free transactions tail.
+ * pipe:                  Storage for pipes.
+ * transaction:                   Storage for transactions.
+ * callback:              User global callbacks.
+ * callback_data:         User data for each callback.
+ * indent:                Used by debug output to indent functions.
+ * port_status:                   Last port status used for change notification.
+ * free_pipes:            List of all pipes that are currently closed.
+ * idle_pipes:            List of open pipes that have no transactions.
+ * active_pipes:          Active pipes indexed by transfer type.
+ * frame_number:          Increments every SOF interrupt for time keeping.
+ * active_split:          Points to the current active split, or NULL.
+ */
+struct cvmx_usb_internal_state {
+       int init_flags;
+       int index;
+       int idle_hardware_channels;
+       union cvmx_usbcx_hprt usbcx_hprt;
+       struct cvmx_usb_pipe *pipe_for_channel[MAX_CHANNELS];
+       struct cvmx_usb_transaction *free_transaction_head;
+       struct cvmx_usb_transaction *free_transaction_tail;
+       struct cvmx_usb_pipe pipe[MAX_PIPES];
+       struct cvmx_usb_transaction transaction[MAX_TRANSACTIONS];
+       cvmx_usb_callback_func_t callback[__CVMX_USB_CALLBACK_END];
+       void *callback_data[__CVMX_USB_CALLBACK_END];
+       int indent;
+       struct cvmx_usb_port_status port_status;
+       struct cvmx_usb_pipe_list free_pipes;
+       struct cvmx_usb_pipe_list idle_pipes;
+       struct cvmx_usb_pipe_list active_pipes[4];
+       uint64_t frame_number;
+       struct cvmx_usb_transaction *active_split;
+       struct cvmx_usb_tx_fifo periodic;
+       struct cvmx_usb_tx_fifo nonperiodic;
+};
+
 struct octeon_hcd {
        spinlock_t lock;
        struct cvmx_usb_state usb;
@@ -31,6 +538,2914 @@ struct octeon_hcd {
        struct list_head dequeue_list;
 };
 
+/* This macro spins on a field waiting for it to reach a value */
+#define CVMX_WAIT_FOR_FIELD32(address, type, field, op, value, timeout_usec)\
+       ({int result;                                                       \
+       do {                                                                \
+               uint64_t done = cvmx_get_cycle() + (uint64_t)timeout_usec * \
+                       octeon_get_clock_rate() / 1000000;                  \
+               type c;                                                     \
+               while (1) {                                                 \
+                       c.u32 = __cvmx_usb_read_csr32(usb, address);        \
+                       if (c.s.field op (value)) {                         \
+                               result = 0;                                 \
+                               break;                                      \
+                       } else if (cvmx_get_cycle() > done) {               \
+                               result = -1;                                \
+                               break;                                      \
+                       } else                                              \
+                               cvmx_wait(100);                             \
+               }                                                           \
+       } while (0);                                                        \
+       result; })
+
+/*
+ * This macro logically sets a single field in a CSR. It does the sequence
+ * read, modify, and write
+ */
+#define USB_SET_FIELD32(address, type, field, value)           \
+       do {                                                    \
+               type c;                                         \
+               c.u32 = __cvmx_usb_read_csr32(usb, address);    \
+               c.s.field = value;                              \
+               __cvmx_usb_write_csr32(usb, address, c.u32);    \
+       } while (0)
+
+/* Returns the IO address to push/pop stuff data from the FIFOs */
+#define USB_FIFO_ADDRESS(channel, usb_index) (CVMX_USBCX_GOTGCTL(usb_index) + ((channel)+1)*0x1000)
+
+static int octeon_usb_get_clock_type(void)
+{
+       switch (cvmx_sysinfo_get()->board_type) {
+       case CVMX_BOARD_TYPE_BBGW_REF:
+       case CVMX_BOARD_TYPE_LANAI2_A:
+       case CVMX_BOARD_TYPE_LANAI2_U:
+       case CVMX_BOARD_TYPE_LANAI2_G:
+       case CVMX_BOARD_TYPE_UBNT_E100:
+               return USB_CLOCK_TYPE_CRYSTAL_12;
+       }
+       return USB_CLOCK_TYPE_REF_48;
+}
+
+/**
+ * Read a USB 32bit CSR. It performs the necessary address swizzle
+ * for 32bit CSRs and logs the value in a readable format if
+ * debugging is on.
+ *
+ * @usb:     USB block this access is for
+ * @address: 64bit address to read
+ *
+ * Returns: Result of the read
+ */
+static inline uint32_t __cvmx_usb_read_csr32(struct cvmx_usb_internal_state *usb,
+                                            uint64_t address)
+{
+       uint32_t result = cvmx_read64_uint32(address ^ 4);
+       return result;
+}
+
+
+/**
+ * Write a USB 32bit CSR. It performs the necessary address
+ * swizzle for 32bit CSRs and logs the value in a readable format
+ * if debugging is on.
+ *
+ * @usb:     USB block this access is for
+ * @address: 64bit address to write
+ * @value:   Value to write
+ */
+static inline void __cvmx_usb_write_csr32(struct cvmx_usb_internal_state *usb,
+                                         uint64_t address, uint32_t value)
+{
+       cvmx_write64_uint32(address ^ 4, value);
+       cvmx_read64_uint64(CVMX_USBNX_DMA0_INB_CHN0(usb->index));
+}
+
+
+/**
+ * Read a USB 64bit CSR. It logs the value in a readable format if
+ * debugging is on.
+ *
+ * @usb:     USB block this access is for
+ * @address: 64bit address to read
+ *
+ * Returns: Result of the read
+ */
+static inline uint64_t __cvmx_usb_read_csr64(struct cvmx_usb_internal_state *usb,
+                                            uint64_t address)
+{
+       uint64_t result = cvmx_read64_uint64(address);
+       return result;
+}
+
+
+/**
+ * Write a USB 64bit CSR. It logs the value in a readable format
+ * if debugging is on.
+ *
+ * @usb:     USB block this access is for
+ * @address: 64bit address to write
+ * @value:   Value to write
+ */
+static inline void __cvmx_usb_write_csr64(struct cvmx_usb_internal_state *usb,
+                                         uint64_t address, uint64_t value)
+{
+       cvmx_write64_uint64(address, value);
+}
+
+/**
+ * Return non zero if this pipe connects to a non HIGH speed
+ * device through a high speed hub.
+ *
+ * @usb:    USB block this access is for
+ * @pipe:   Pipe to check
+ *
+ * Returns: Non zero if we need to do split transactions
+ */
+static inline int __cvmx_usb_pipe_needs_split(struct cvmx_usb_internal_state *usb, struct cvmx_usb_pipe *pipe)
+{
+       return ((pipe->device_speed != CVMX_USB_SPEED_HIGH) && (usb->usbcx_hprt.s.prtspd == CVMX_USB_SPEED_HIGH));
+}
+
+
+/**
+ * Trivial utility function to return the correct PID for a pipe
+ *
+ * @pipe:   pipe to check
+ *
+ * Returns: PID for pipe
+ */
+static inline int __cvmx_usb_get_data_pid(struct cvmx_usb_pipe *pipe)
+{
+       if (pipe->pid_toggle)
+               return 2; /* Data1 */
+       else
+               return 0; /* Data0 */
+}
+
+
+/**
+ * Return the number of USB ports supported by this Octeon
+ * chip. If the chip doesn't support USB, or is not supported
+ * by this API, a zero will be returned. Most Octeon chips
+ * support one usb port, but some support two ports.
+ * cvmx_usb_initialize() must be called on independent
+ * struct cvmx_usb_state.
+ *
+ * Returns: Number of port, zero if usb isn't supported
+ */
+static int cvmx_usb_get_num_ports(void)
+{
+       int arch_ports = 0;
+
+       if (OCTEON_IS_MODEL(OCTEON_CN56XX))
+               arch_ports = 1;
+       else if (OCTEON_IS_MODEL(OCTEON_CN52XX))
+               arch_ports = 2;
+       else if (OCTEON_IS_MODEL(OCTEON_CN50XX))
+               arch_ports = 1;
+       else if (OCTEON_IS_MODEL(OCTEON_CN31XX))
+               arch_ports = 1;
+       else if (OCTEON_IS_MODEL(OCTEON_CN30XX))
+               arch_ports = 1;
+       else
+               arch_ports = 0;
+
+       return arch_ports;
+}
+
+
+/**
+ * Allocate a usb transaction for use
+ *
+ * @usb:        USB device state populated by
+ *              cvmx_usb_initialize().
+ *
+ * Returns: Transaction or NULL
+ */
+static inline struct cvmx_usb_transaction *__cvmx_usb_alloc_transaction(struct cvmx_usb_internal_state *usb)
+{
+       struct cvmx_usb_transaction *t;
+       t = usb->free_transaction_head;
+       if (t) {
+               usb->free_transaction_head = t->next;
+               if (!usb->free_transaction_head)
+                       usb->free_transaction_tail = NULL;
+       }
+       if (t) {
+               memset(t, 0, sizeof(*t));
+               t->flags = __CVMX_USB_TRANSACTION_FLAGS_IN_USE;
+       }
+       return t;
+}
+
+
+/**
+ * Free a usb transaction
+ *
+ * @usb:        USB device state populated by
+ *              cvmx_usb_initialize().
+ * @transaction:
+ *              Transaction to free
+ */
+static inline void __cvmx_usb_free_transaction(struct cvmx_usb_internal_state *usb,
+                                              struct cvmx_usb_transaction *transaction)
+{
+       transaction->flags = 0;
+       transaction->prev = NULL;
+       transaction->next = NULL;
+       if (usb->free_transaction_tail)
+               usb->free_transaction_tail->next = transaction;
+       else
+               usb->free_transaction_head = transaction;
+       usb->free_transaction_tail = transaction;
+}
+
+
+/**
+ * Add a pipe to the tail of a list
+ * @list:   List to add pipe to
+ * @pipe:   Pipe to add
+ */
+static inline void __cvmx_usb_append_pipe(struct cvmx_usb_pipe_list *list, struct cvmx_usb_pipe *pipe)
+{
+       pipe->next = NULL;
+       pipe->prev = list->tail;
+       if (list->tail)
+               list->tail->next = pipe;
+       else
+               list->head = pipe;
+       list->tail = pipe;
+}
+
+
+/**
+ * Remove a pipe from a list
+ * @list:   List to remove pipe from
+ * @pipe:   Pipe to remove
+ */
+static inline void __cvmx_usb_remove_pipe(struct cvmx_usb_pipe_list *list, struct cvmx_usb_pipe *pipe)
+{
+       if (list->head == pipe) {
+               list->head = pipe->next;
+               pipe->next = NULL;
+               if (list->head)
+                       list->head->prev = NULL;
+               else
+                       list->tail = NULL;
+       } else if (list->tail == pipe) {
+               list->tail = pipe->prev;
+               list->tail->next = NULL;
+               pipe->prev = NULL;
+       } else {
+               pipe->prev->next = pipe->next;
+               pipe->next->prev = pipe->prev;
+               pipe->prev = NULL;
+               pipe->next = NULL;
+       }
+}
+
+
+/**
+ * Initialize a USB port for use. This must be called before any
+ * other access to the Octeon USB port is made. The port starts
+ * off in the disabled state.
+ *
+ * @state:      Pointer to an empty struct cvmx_usb_state
+ *              that will be populated by the initialize call.
+ *              This structure is then passed to all other USB
+ *              functions.
+ * @usb_port_number:
+ *              Which Octeon USB port to initialize.
+ *
+ * Returns: 0 or a negative error code.
+ */
+static int cvmx_usb_initialize(struct cvmx_usb_state *state,
+                              int usb_port_number)
+{
+       union cvmx_usbnx_clk_ctl usbn_clk_ctl;
+       union cvmx_usbnx_usbp_ctl_status usbn_usbp_ctl_status;
+       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
+       enum cvmx_usb_initialize_flags flags = 0;
+
+       /* Make sure that state is large enough to store the internal state */
+       if (sizeof(*state) < sizeof(*usb))
+               return -EINVAL;
+       /* At first allow 0-1 for the usb port number */
+       if ((usb_port_number < 0) || (usb_port_number > 1))
+               return -EINVAL;
+       /* For all chips except 52XX there is only one port */
+       if (!OCTEON_IS_MODEL(OCTEON_CN52XX) && (usb_port_number > 0))
+               return -EINVAL;
+       /* Try to determine clock type automatically */
+       if (octeon_usb_get_clock_type() == USB_CLOCK_TYPE_CRYSTAL_12) {
+               /* Only 12 MHZ crystals are supported */
+               flags |= CVMX_USB_INITIALIZE_FLAGS_CLOCK_XO_XI;
+       } else {
+               flags |= CVMX_USB_INITIALIZE_FLAGS_CLOCK_XO_GND;
+
+               switch (octeon_usb_get_clock_type()) {
+               case USB_CLOCK_TYPE_REF_12:
+                       flags |= CVMX_USB_INITIALIZE_FLAGS_CLOCK_12MHZ;
+                       break;
+               case USB_CLOCK_TYPE_REF_24:
+                       flags |= CVMX_USB_INITIALIZE_FLAGS_CLOCK_24MHZ;
+                       break;
+               case USB_CLOCK_TYPE_REF_48:
+                       flags |= CVMX_USB_INITIALIZE_FLAGS_CLOCK_48MHZ;
+                       break;
+               default:
+                       return -EINVAL;
+                       break;
+               }
+       }
+
+       memset(usb, 0, sizeof(*usb));
+       usb->init_flags = flags;
+
+       /* Initialize the USB state structure */
+       {
+               int i;
+               usb->index = usb_port_number;
+
+               /* Initialize the transaction double linked list */
+               usb->free_transaction_head = NULL;
+               usb->free_transaction_tail = NULL;
+               for (i = 0; i < MAX_TRANSACTIONS; i++)
+                       __cvmx_usb_free_transaction(usb, usb->transaction + i);
+               for (i = 0; i < MAX_PIPES; i++)
+                       __cvmx_usb_append_pipe(&usb->free_pipes, usb->pipe + i);
+       }
+
+       /*
+        * Power On Reset and PHY Initialization
+        *
+        * 1. Wait for DCOK to assert (nothing to do)
+        *
+        * 2a. Write USBN0/1_CLK_CTL[POR] = 1 and
+        *     USBN0/1_CLK_CTL[HRST,PRST,HCLK_RST] = 0
+        */
+       usbn_clk_ctl.u64 = __cvmx_usb_read_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index));
+       usbn_clk_ctl.s.por = 1;
+       usbn_clk_ctl.s.hrst = 0;
+       usbn_clk_ctl.s.prst = 0;
+       usbn_clk_ctl.s.hclk_rst = 0;
+       usbn_clk_ctl.s.enable = 0;
+       /*
+        * 2b. Select the USB reference clock/crystal parameters by writing
+        *     appropriate values to USBN0/1_CLK_CTL[P_C_SEL, P_RTYPE, P_COM_ON]
+        */
+       if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_CLOCK_XO_GND) {
+               /*
+                * The USB port uses 12/24/48MHz 2.5V board clock
+                * source at USB_XO. USB_XI should be tied to GND.
+                * Most Octeon evaluation boards require this setting
+                */
+               if (OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
+                       /* From CN31XX,CN30XX manual */
+                       usbn_clk_ctl.cn31xx.p_rclk  = 1;
+                       usbn_clk_ctl.cn31xx.p_xenbn = 0;
+               } else if (OCTEON_IS_MODEL(OCTEON_CN56XX) || OCTEON_IS_MODEL(OCTEON_CN50XX))
+                       /* From CN56XX,CN50XX manual */
+                       usbn_clk_ctl.cn56xx.p_rtype = 2;
+               else
+                       /* From CN52XX manual */
+                       usbn_clk_ctl.cn52xx.p_rtype = 1;
+
+               switch (flags & CVMX_USB_INITIALIZE_FLAGS_CLOCK_MHZ_MASK) {
+               case CVMX_USB_INITIALIZE_FLAGS_CLOCK_12MHZ:
+                       usbn_clk_ctl.s.p_c_sel = 0;
+                       break;
+               case CVMX_USB_INITIALIZE_FLAGS_CLOCK_24MHZ:
+                       usbn_clk_ctl.s.p_c_sel = 1;
+                       break;
+               case CVMX_USB_INITIALIZE_FLAGS_CLOCK_48MHZ:
+                       usbn_clk_ctl.s.p_c_sel = 2;
+                       break;
+               }
+       } else {
+               /*
+                * The USB port uses a 12MHz crystal as clock source
+                * at USB_XO and USB_XI
+                */
+               if (OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
+                       /* From CN31XX,CN30XX manual */
+                       usbn_clk_ctl.cn31xx.p_rclk  = 1;
+                       usbn_clk_ctl.cn31xx.p_xenbn = 1;
+               } else if (OCTEON_IS_MODEL(OCTEON_CN56XX) || OCTEON_IS_MODEL(OCTEON_CN50XX))
+                       /* From CN56XX,CN50XX manual */
+                       usbn_clk_ctl.cn56xx.p_rtype = 0;
+               else
+                       /* From CN52XX manual */
+                       usbn_clk_ctl.cn52xx.p_rtype = 0;
+
+               usbn_clk_ctl.s.p_c_sel = 0;
+       }
+       /*
+        * 2c. Select the HCLK via writing USBN0/1_CLK_CTL[DIVIDE, DIVIDE2] and
+        *     setting USBN0/1_CLK_CTL[ENABLE] = 1. Divide the core clock down
+        *     such that USB is as close as possible to 125Mhz
+        */
+       {
+               int divisor = (octeon_get_clock_rate()+125000000-1)/125000000;
+               /* Lower than 4 doesn't seem to work properly */
+               if (divisor < 4)
+                       divisor = 4;
+               usbn_clk_ctl.s.divide = divisor;
+               usbn_clk_ctl.s.divide2 = 0;
+       }
+       __cvmx_usb_write_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index),
+                              usbn_clk_ctl.u64);
+       /* 2d. Write USBN0/1_CLK_CTL[HCLK_RST] = 1 */
+       usbn_clk_ctl.s.hclk_rst = 1;
+       __cvmx_usb_write_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index),
+                              usbn_clk_ctl.u64);
+       /* 2e.  Wait 64 core-clock cycles for HCLK to stabilize */
+       cvmx_wait(64);
+       /*
+        * 3. Program the power-on reset field in the USBN clock-control
+        *    register:
+        *    USBN_CLK_CTL[POR] = 0
+        */
+       usbn_clk_ctl.s.por = 0;
+       __cvmx_usb_write_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index),
+                              usbn_clk_ctl.u64);
+       /* 4. Wait 1 ms for PHY clock to start */
+       mdelay(1);
+       /*
+        * 5. Program the Reset input from automatic test equipment field in the
+        *    USBP control and status register:
+        *    USBN_USBP_CTL_STATUS[ATE_RESET] = 1
+        */
+       usbn_usbp_ctl_status.u64 = __cvmx_usb_read_csr64(usb, CVMX_USBNX_USBP_CTL_STATUS(usb->index));
+       usbn_usbp_ctl_status.s.ate_reset = 1;
+       __cvmx_usb_write_csr64(usb, CVMX_USBNX_USBP_CTL_STATUS(usb->index),
+                              usbn_usbp_ctl_status.u64);
+       /* 6. Wait 10 cycles */
+       cvmx_wait(10);
+       /*
+        * 7. Clear ATE_RESET field in the USBN clock-control register:
+        *    USBN_USBP_CTL_STATUS[ATE_RESET] = 0
+        */
+       usbn_usbp_ctl_status.s.ate_reset = 0;
+       __cvmx_usb_write_csr64(usb, CVMX_USBNX_USBP_CTL_STATUS(usb->index),
+                              usbn_usbp_ctl_status.u64);
+       /*
+        * 8. Program the PHY reset field in the USBN clock-control register:
+        *    USBN_CLK_CTL[PRST] = 1
+        */
+       usbn_clk_ctl.s.prst = 1;
+       __cvmx_usb_write_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index),
+                              usbn_clk_ctl.u64);
+       /*
+        * 9. Program the USBP control and status register to select host or
+        *    device mode. USBN_USBP_CTL_STATUS[HST_MODE] = 0 for host, = 1 for
+        *    device
+        */
+       usbn_usbp_ctl_status.s.hst_mode = 0;
+       __cvmx_usb_write_csr64(usb, CVMX_USBNX_USBP_CTL_STATUS(usb->index),
+                              usbn_usbp_ctl_status.u64);
+       /* 10. Wait 1 us */
+       udelay(1);
+       /*
+        * 11. Program the hreset_n field in the USBN clock-control register:
+        *     USBN_CLK_CTL[HRST] = 1
+        */
+       usbn_clk_ctl.s.hrst = 1;
+       __cvmx_usb_write_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index),
+                              usbn_clk_ctl.u64);
+       /* 12. Proceed to USB core initialization */
+       usbn_clk_ctl.s.enable = 1;
+       __cvmx_usb_write_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index),
+                              usbn_clk_ctl.u64);
+       udelay(1);
+
+       /*
+        * USB Core Initialization
+        *
+        * 1. Read USBC_GHWCFG1, USBC_GHWCFG2, USBC_GHWCFG3, USBC_GHWCFG4 to
+        *    determine USB core configuration parameters.
+        *
+        *    Nothing needed
+        *
+        * 2. Program the following fields in the global AHB configuration
+        *    register (USBC_GAHBCFG)
+        *    DMA mode, USBC_GAHBCFG[DMAEn]: 1 = DMA mode, 0 = slave mode
+        *    Burst length, USBC_GAHBCFG[HBSTLEN] = 0
+        *    Nonperiodic TxFIFO empty level (slave mode only),
+        *    USBC_GAHBCFG[NPTXFEMPLVL]
+        *    Periodic TxFIFO empty level (slave mode only),
+        *    USBC_GAHBCFG[PTXFEMPLVL]
+        *    Global interrupt mask, USBC_GAHBCFG[GLBLINTRMSK] = 1
+        */
+       {
+               union cvmx_usbcx_gahbcfg usbcx_gahbcfg;
+               /* Due to an errata, CN31XX doesn't support DMA */
+               if (OCTEON_IS_MODEL(OCTEON_CN31XX))
+                       usb->init_flags |= CVMX_USB_INITIALIZE_FLAGS_NO_DMA;
+               usbcx_gahbcfg.u32 = 0;
+               usbcx_gahbcfg.s.dmaen = !(usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA);
+               if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA)
+                       /* Only use one channel with non DMA */
+                       usb->idle_hardware_channels = 0x1;
+               else if (OCTEON_IS_MODEL(OCTEON_CN5XXX))
+                       /* CN5XXX have an errata with channel 3 */
+                       usb->idle_hardware_channels = 0xf7;
+               else
+                       usb->idle_hardware_channels = 0xff;
+               usbcx_gahbcfg.s.hbstlen = 0;
+               usbcx_gahbcfg.s.nptxfemplvl = 1;
+               usbcx_gahbcfg.s.ptxfemplvl = 1;
+               usbcx_gahbcfg.s.glblintrmsk = 1;
+               __cvmx_usb_write_csr32(usb, CVMX_USBCX_GAHBCFG(usb->index),
+                                      usbcx_gahbcfg.u32);
+       }
+       /*
+        * 3. Program the following fields in USBC_GUSBCFG register.
+        *    HS/FS timeout calibration, USBC_GUSBCFG[TOUTCAL] = 0
+        *    ULPI DDR select, USBC_GUSBCFG[DDRSEL] = 0
+        *    USB turnaround time, USBC_GUSBCFG[USBTRDTIM] = 0x5
+        *    PHY low-power clock select, USBC_GUSBCFG[PHYLPWRCLKSEL] = 0
+        */
+       {
+               union cvmx_usbcx_gusbcfg usbcx_gusbcfg;
+               usbcx_gusbcfg.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_GUSBCFG(usb->index));
+               usbcx_gusbcfg.s.toutcal = 0;
+               usbcx_gusbcfg.s.ddrsel = 0;
+               usbcx_gusbcfg.s.usbtrdtim = 0x5;
+               usbcx_gusbcfg.s.phylpwrclksel = 0;
+               __cvmx_usb_write_csr32(usb, CVMX_USBCX_GUSBCFG(usb->index),
+                                      usbcx_gusbcfg.u32);
+       }
+       /*
+        * 4. The software must unmask the following bits in the USBC_GINTMSK
+        *    register.
+        *    OTG interrupt mask, USBC_GINTMSK[OTGINTMSK] = 1
+        *    Mode mismatch interrupt mask, USBC_GINTMSK[MODEMISMSK] = 1
+        */
+       {
+               union cvmx_usbcx_gintmsk usbcx_gintmsk;
+               int channel;
+
+               usbcx_gintmsk.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_GINTMSK(usb->index));
+               usbcx_gintmsk.s.otgintmsk = 1;
+               usbcx_gintmsk.s.modemismsk = 1;
+               usbcx_gintmsk.s.hchintmsk = 1;
+               usbcx_gintmsk.s.sofmsk = 0;
+               /* We need RX FIFO interrupts if we don't have DMA */
+               if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA)
+                       usbcx_gintmsk.s.rxflvlmsk = 1;
+               __cvmx_usb_write_csr32(usb, CVMX_USBCX_GINTMSK(usb->index),
+                                      usbcx_gintmsk.u32);
+
+               /*
+                * Disable all channel interrupts. We'll enable them per channel
+                * later.
+                */
+               for (channel = 0; channel < 8; channel++)
+                       __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCINTMSKX(channel, usb->index), 0);
+       }
+
+       {
+               /*
+                * Host Port Initialization
+                *
+                * 1. Program the host-port interrupt-mask field to unmask,
+                *    USBC_GINTMSK[PRTINT] = 1
+                */
+               USB_SET_FIELD32(CVMX_USBCX_GINTMSK(usb->index), union cvmx_usbcx_gintmsk,
+                               prtintmsk, 1);
+               USB_SET_FIELD32(CVMX_USBCX_GINTMSK(usb->index), union cvmx_usbcx_gintmsk,
+                               disconnintmsk, 1);
+               /*
+                * 2. Program the USBC_HCFG register to select full-speed host
+                *    or high-speed host.
+                */
+               {
+                       union cvmx_usbcx_hcfg usbcx_hcfg;
+                       usbcx_hcfg.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCFG(usb->index));
+                       usbcx_hcfg.s.fslssupp = 0;
+                       usbcx_hcfg.s.fslspclksel = 0;
+                       __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCFG(usb->index), usbcx_hcfg.u32);
+               }
+               /*
+                * 3. Program the port power bit to drive VBUS on the USB,
+                *    USBC_HPRT[PRTPWR] = 1
+                */
+               USB_SET_FIELD32(CVMX_USBCX_HPRT(usb->index), union cvmx_usbcx_hprt, prtpwr, 1);
+
+               /*
+                * Steps 4-15 from the manual are done later in the port enable
+                */
+       }
+
+       return 0;
+}
+
+
+/**
+ * Shutdown a USB port after a call to cvmx_usb_initialize().
+ * The port should be disabled with all pipes closed when this
+ * function is called.
+ *
+ * @state: USB device state populated by
+ *        cvmx_usb_initialize().
+ *
+ * Returns: 0 or a negative error code.
+ */
+static int cvmx_usb_shutdown(struct cvmx_usb_state *state)
+{
+       union cvmx_usbnx_clk_ctl usbn_clk_ctl;
+       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
+
+       /* Make sure all pipes are closed */
+       if (usb->idle_pipes.head ||
+               usb->active_pipes[CVMX_USB_TRANSFER_ISOCHRONOUS].head ||
+               usb->active_pipes[CVMX_USB_TRANSFER_INTERRUPT].head ||
+               usb->active_pipes[CVMX_USB_TRANSFER_CONTROL].head ||
+               usb->active_pipes[CVMX_USB_TRANSFER_BULK].head)
+               return -EBUSY;
+
+       /* Disable the clocks and put them in power on reset */
+       usbn_clk_ctl.u64 = __cvmx_usb_read_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index));
+       usbn_clk_ctl.s.enable = 1;
+       usbn_clk_ctl.s.por = 1;
+       usbn_clk_ctl.s.hclk_rst = 1;
+       usbn_clk_ctl.s.prst = 0;
+       usbn_clk_ctl.s.hrst = 0;
+       __cvmx_usb_write_csr64(usb, CVMX_USBNX_CLK_CTL(usb->index),
+                              usbn_clk_ctl.u64);
+       return 0;
+}
+
+
+/**
+ * Enable a USB port. After this call succeeds, the USB port is
+ * online and servicing requests.
+ *
+ * @state: USB device state populated by
+ *        cvmx_usb_initialize().
+ *
+ * Returns: 0 or a negative error code.
+ */
+static int cvmx_usb_enable(struct cvmx_usb_state *state)
+{
+       union cvmx_usbcx_ghwcfg3 usbcx_ghwcfg3;
+       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
+
+       usb->usbcx_hprt.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HPRT(usb->index));
+
+       /*
+        * If the port is already enabled the just return. We don't need to do
+        * anything
+        */
+       if (usb->usbcx_hprt.s.prtena)
+               return 0;
+
+       /* If there is nothing plugged into the port then fail immediately */
+       if (!usb->usbcx_hprt.s.prtconnsts) {
+               return -ETIMEDOUT;
+       }
+
+       /* Program the port reset bit to start the reset process */
+       USB_SET_FIELD32(CVMX_USBCX_HPRT(usb->index), union cvmx_usbcx_hprt, prtrst, 1);
+
+       /*
+        * Wait at least 50ms (high speed), or 10ms (full speed) for the reset
+        * process to complete.
+        */
+       mdelay(50);
+
+       /* Program the port reset bit to 0, USBC_HPRT[PRTRST] = 0 */
+       USB_SET_FIELD32(CVMX_USBCX_HPRT(usb->index), union cvmx_usbcx_hprt, prtrst, 0);
+
+       /* Wait for the USBC_HPRT[PRTENA]. */
+       if (CVMX_WAIT_FOR_FIELD32(CVMX_USBCX_HPRT(usb->index), union cvmx_usbcx_hprt,
+                                 prtena, ==, 1, 100000))
+               return -ETIMEDOUT;
+
+       /*
+        * Read the port speed field to get the enumerated speed,
+        * USBC_HPRT[PRTSPD].
+        */
+       usb->usbcx_hprt.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HPRT(usb->index));
+       usbcx_ghwcfg3.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_GHWCFG3(usb->index));
+
+       /*
+        * 13. Program the USBC_GRXFSIZ register to select the size of the
+        *     receive FIFO (25%).
+        */
+       USB_SET_FIELD32(CVMX_USBCX_GRXFSIZ(usb->index), union cvmx_usbcx_grxfsiz,
+                       rxfdep, usbcx_ghwcfg3.s.dfifodepth / 4);
+       /*
+        * 14. Program the USBC_GNPTXFSIZ register to select the size and the
+        *     start address of the non- periodic transmit FIFO for nonperiodic
+        *     transactions (50%).
+        */
+       {
+               union cvmx_usbcx_gnptxfsiz siz;
+               siz.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_GNPTXFSIZ(usb->index));
+               siz.s.nptxfdep = usbcx_ghwcfg3.s.dfifodepth / 2;
+               siz.s.nptxfstaddr = usbcx_ghwcfg3.s.dfifodepth / 4;
+               __cvmx_usb_write_csr32(usb, CVMX_USBCX_GNPTXFSIZ(usb->index), siz.u32);
+       }
+       /*
+        * 15. Program the USBC_HPTXFSIZ register to select the size and start
+        *     address of the periodic transmit FIFO for periodic transactions
+        *     (25%).
+        */
+       {
+               union cvmx_usbcx_hptxfsiz siz;
+               siz.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HPTXFSIZ(usb->index));
+               siz.s.ptxfsize = usbcx_ghwcfg3.s.dfifodepth / 4;
+               siz.s.ptxfstaddr = 3 * usbcx_ghwcfg3.s.dfifodepth / 4;
+               __cvmx_usb_write_csr32(usb, CVMX_USBCX_HPTXFSIZ(usb->index), siz.u32);
+       }
+       /* Flush all FIFOs */
+       USB_SET_FIELD32(CVMX_USBCX_GRSTCTL(usb->index), union cvmx_usbcx_grstctl, txfnum, 0x10);
+       USB_SET_FIELD32(CVMX_USBCX_GRSTCTL(usb->index), union cvmx_usbcx_grstctl, txfflsh, 1);
+       CVMX_WAIT_FOR_FIELD32(CVMX_USBCX_GRSTCTL(usb->index), union cvmx_usbcx_grstctl,
+                             txfflsh, ==, 0, 100);
+       USB_SET_FIELD32(CVMX_USBCX_GRSTCTL(usb->index), union cvmx_usbcx_grstctl, rxfflsh, 1);
+       CVMX_WAIT_FOR_FIELD32(CVMX_USBCX_GRSTCTL(usb->index), union cvmx_usbcx_grstctl,
+                             rxfflsh, ==, 0, 100);
+
+       return 0;
+}
+
+
+/**
+ * Disable a USB port. After this call the USB port will not
+ * generate data transfers and will not generate events.
+ * Transactions in process will fail and call their
+ * associated callbacks.
+ *
+ * @state: USB device state populated by
+ *        cvmx_usb_initialize().
+ *
+ * Returns: 0 or a negative error code.
+ */
+static int cvmx_usb_disable(struct cvmx_usb_state *state)
+{
+       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
+
+       /* Disable the port */
+       USB_SET_FIELD32(CVMX_USBCX_HPRT(usb->index), union cvmx_usbcx_hprt, prtena, 1);
+       return 0;
+}
+
+
+/**
+ * Get the current state of the USB port. Use this call to
+ * determine if the usb port has anything connected, is enabled,
+ * or has some sort of error condition. The return value of this
+ * call has "changed" bits to signal of the value of some fields
+ * have changed between calls. These "changed" fields are based
+ * on the last call to cvmx_usb_set_status(). In order to clear
+ * them, you must update the status through cvmx_usb_set_status().
+ *
+ * @state: USB device state populated by
+ *        cvmx_usb_initialize().
+ *
+ * Returns: Port status information
+ */
+static struct cvmx_usb_port_status cvmx_usb_get_status(struct cvmx_usb_state *state)
+{
+       union cvmx_usbcx_hprt usbc_hprt;
+       struct cvmx_usb_port_status result;
+       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
+
+       memset(&result, 0, sizeof(result));
+
+       usbc_hprt.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HPRT(usb->index));
+       result.port_enabled = usbc_hprt.s.prtena;
+       result.port_over_current = usbc_hprt.s.prtovrcurract;
+       result.port_powered = usbc_hprt.s.prtpwr;
+       result.port_speed = usbc_hprt.s.prtspd;
+       result.connected = usbc_hprt.s.prtconnsts;
+       result.connect_change = (result.connected != usb->port_status.connected);
+
+       return result;
+}
+
+
+/**
+ * Set the current state of the USB port. The status is used as
+ * a reference for the "changed" bits returned by
+ * cvmx_usb_get_status(). Other than serving as a reference, the
+ * status passed to this function is not used. No fields can be
+ * changed through this call.
+ *
+ * @state:      USB device state populated by
+ *              cvmx_usb_initialize().
+ * @port_status:
+ *              Port status to set, most like returned by cvmx_usb_get_status()
+ */
+static void cvmx_usb_set_status(struct cvmx_usb_state *state,
+                               struct cvmx_usb_port_status port_status)
+{
+       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
+       usb->port_status = port_status;
+       return;
+}
+
+
+/**
+ * Convert a USB transaction into a handle
+ *
+ * @usb:        USB device state populated by
+ *              cvmx_usb_initialize().
+ * @transaction:
+ *              Transaction to get handle for
+ *
+ * Returns: Handle
+ */
+static inline int __cvmx_usb_get_submit_handle(struct cvmx_usb_internal_state *usb,
+                                              struct cvmx_usb_transaction *transaction)
+{
+       return ((unsigned long)transaction - (unsigned long)usb->transaction) /
+                       sizeof(*transaction);
+}
+
+
+/**
+ * Convert a USB pipe into a handle
+ *
+ * @usb:        USB device state populated by
+ *              cvmx_usb_initialize().
+ * @pipe:       Pipe to get handle for
+ *
+ * Returns: Handle
+ */
+static inline int __cvmx_usb_get_pipe_handle(struct cvmx_usb_internal_state *usb,
+                                            struct cvmx_usb_pipe *pipe)
+{
+       return ((unsigned long)pipe - (unsigned long)usb->pipe) / sizeof(*pipe);
+}
+
+
+/**
+ * Open a virtual pipe between the host and a USB device. A pipe
+ * must be opened before data can be transferred between a device
+ * and Octeon.
+ *
+ * @state:          USB device state populated by
+ *                  cvmx_usb_initialize().
+ * @device_addr:
+ *                  USB device address to open the pipe to
+ *                  (0-127).
+ * @endpoint_num:
+ *                  USB endpoint number to open the pipe to
+ *                  (0-15).
+ * @device_speed:
+ *                  The speed of the device the pipe is going
+ *                  to. This must match the device's speed,
+ *                  which may be different than the port speed.
+ * @max_packet:             The maximum packet length the device can
+ *                  transmit/receive (low speed=0-8, full
+ *                  speed=0-1023, high speed=0-1024). This value
+ *                  comes from the standard endpoint descriptor
+ *                  field wMaxPacketSize bits <10:0>.
+ * @transfer_type:
+ *                  The type of transfer this pipe is for.
+ * @transfer_dir:
+ *                  The direction the pipe is in. This is not
+ *                  used for control pipes.
+ * @interval:       For ISOCHRONOUS and INTERRUPT transfers,
+ *                  this is how often the transfer is scheduled
+ *                  for. All other transfers should specify
+ *                  zero. The units are in frames (8000/sec at
+ *                  high speed, 1000/sec for full speed).
+ * @multi_count:
+ *                  For high speed devices, this is the maximum
+ *                  allowed number of packet per microframe.
+ *                  Specify zero for non high speed devices. This
+ *                  value comes from the standard endpoint descriptor
+ *                  field wMaxPacketSize bits <12:11>.
+ * @hub_device_addr:
+ *                  Hub device address this device is connected
+ *                  to. Devices connected directly to Octeon
+ *                  use zero. This is only used when the device
+ *                  is full/low speed behind a high speed hub.
+ *                  The address will be of the high speed hub,
+ *                  not and full speed hubs after it.
+ * @hub_port:       Which port on the hub the device is
+ *                  connected. Use zero for devices connected
+ *                  directly to Octeon. Like hub_device_addr,
+ *                  this is only used for full/low speed
+ *                  devices behind a high speed hub.
+ *
+ * Returns: A non negative value is a pipe handle. Negative
+ *         values are error codes.
+ */
+static int cvmx_usb_open_pipe(struct cvmx_usb_state *state,
+                             int device_addr, int endpoint_num,
+                             enum cvmx_usb_speed device_speed, int max_packet,
+                             enum cvmx_usb_transfer transfer_type,
+                             enum cvmx_usb_direction transfer_dir,
+                             int interval, int multi_count,
+                             int hub_device_addr, int hub_port)
+{
+       struct cvmx_usb_pipe *pipe;
+       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
+
+       if (unlikely((device_addr < 0) || (device_addr > MAX_USB_ADDRESS)))
+               return -EINVAL;
+       if (unlikely((endpoint_num < 0) || (endpoint_num > MAX_USB_ENDPOINT)))
+               return -EINVAL;
+       if (unlikely(device_speed > CVMX_USB_SPEED_LOW))
+               return -EINVAL;
+       if (unlikely((max_packet <= 0) || (max_packet > 1024)))
+               return -EINVAL;
+       if (unlikely(transfer_type > CVMX_USB_TRANSFER_INTERRUPT))
+               return -EINVAL;
+       if (unlikely((transfer_dir != CVMX_USB_DIRECTION_OUT) &&
+               (transfer_dir != CVMX_USB_DIRECTION_IN)))
+               return -EINVAL;
+       if (unlikely(interval < 0))
+               return -EINVAL;
+       if (unlikely((transfer_type == CVMX_USB_TRANSFER_CONTROL) && interval))
+               return -EINVAL;
+       if (unlikely(multi_count < 0))
+               return -EINVAL;
+       if (unlikely((device_speed != CVMX_USB_SPEED_HIGH) &&
+               (multi_count != 0)))
+               return -EINVAL;
+       if (unlikely((hub_device_addr < 0) || (hub_device_addr > MAX_USB_ADDRESS)))
+               return -EINVAL;
+       if (unlikely((hub_port < 0) || (hub_port > MAX_USB_HUB_PORT)))
+               return -EINVAL;
+
+       /* Find a free pipe */
+       pipe = usb->free_pipes.head;
+       if (!pipe)
+               return -ENOMEM;
+       __cvmx_usb_remove_pipe(&usb->free_pipes, pipe);
+       pipe->flags = __CVMX_USB_PIPE_FLAGS_OPEN;
+       if ((device_speed == CVMX_USB_SPEED_HIGH) &&
+               (transfer_dir == CVMX_USB_DIRECTION_OUT) &&
+               (transfer_type == CVMX_USB_TRANSFER_BULK))
+               pipe->flags |= __CVMX_USB_PIPE_FLAGS_NEED_PING;
+       pipe->device_addr = device_addr;
+       pipe->endpoint_num = endpoint_num;
+       pipe->device_speed = device_speed;
+       pipe->max_packet = max_packet;
+       pipe->transfer_type = transfer_type;
+       pipe->transfer_dir = transfer_dir;
+       /*
+        * All pipes use interval to rate limit NAK processing. Force an
+        * interval if one wasn't supplied
+        */
+       if (!interval)
+               interval = 1;
+       if (__cvmx_usb_pipe_needs_split(usb, pipe)) {
+               pipe->interval = interval*8;
+               /* Force start splits to be schedule on uFrame 0 */
+               pipe->next_tx_frame = ((usb->frame_number+7)&~7) + pipe->interval;
+       } else {
+               pipe->interval = interval;
+               pipe->next_tx_frame = usb->frame_number + pipe->interval;
+       }
+       pipe->multi_count = multi_count;
+       pipe->hub_device_addr = hub_device_addr;
+       pipe->hub_port = hub_port;
+       pipe->pid_toggle = 0;
+       pipe->split_sc_frame = -1;
+       __cvmx_usb_append_pipe(&usb->idle_pipes, pipe);
+
+       /*
+        * We don't need to tell the hardware about this pipe yet since
+        * it doesn't have any submitted requests
+        */
+
+       return __cvmx_usb_get_pipe_handle(usb, pipe);
+}
+
+
+/**
+ * Poll the RX FIFOs and remove data as needed. This function is only used
+ * in non DMA mode. It is very important that this function be called quickly
+ * enough to prevent FIFO overflow.
+ *
+ * @usb:       USB device state populated by
+ *             cvmx_usb_initialize().
+ */
+static void __cvmx_usb_poll_rx_fifo(struct cvmx_usb_internal_state *usb)
+{
+       union cvmx_usbcx_grxstsph rx_status;
+       int channel;
+       int bytes;
+       uint64_t address;
+       uint32_t *ptr;
+
+       rx_status.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_GRXSTSPH(usb->index));
+       /* Only read data if IN data is there */
+       if (rx_status.s.pktsts != 2)
+               return;
+       /* Check if no data is available */
+       if (!rx_status.s.bcnt)
+               return;
+
+       channel = rx_status.s.chnum;
+       bytes = rx_status.s.bcnt;
+       if (!bytes)
+               return;
+
+       /* Get where the DMA engine would have written this data */
+       address = __cvmx_usb_read_csr64(usb, CVMX_USBNX_DMA0_INB_CHN0(usb->index) + channel*8);
+       ptr = cvmx_phys_to_ptr(address);
+       __cvmx_usb_write_csr64(usb, CVMX_USBNX_DMA0_INB_CHN0(usb->index) + channel*8, address + bytes);
+
+       /* Loop writing the FIFO data for this packet into memory */
+       while (bytes > 0) {
+               *ptr++ = __cvmx_usb_read_csr32(usb, USB_FIFO_ADDRESS(channel, usb->index));
+               bytes -= 4;
+       }
+       CVMX_SYNCW;
+
+       return;
+}
+
+
+/**
+ * Fill the TX hardware fifo with data out of the software
+ * fifos
+ *
+ * @usb:           USB device state populated by
+ *                 cvmx_usb_initialize().
+ * @fifo:          Software fifo to use
+ * @available:     Amount of space in the hardware fifo
+ *
+ * Returns: Non zero if the hardware fifo was too small and needs
+ *         to be serviced again.
+ */
+static int __cvmx_usb_fill_tx_hw(struct cvmx_usb_internal_state *usb, struct cvmx_usb_tx_fifo *fifo, int available)
+{
+       /*
+        * We're done either when there isn't anymore space or the software FIFO
+        * is empty
+        */
+       while (available && (fifo->head != fifo->tail)) {
+               int i = fifo->tail;
+               const uint32_t *ptr = cvmx_phys_to_ptr(fifo->entry[i].address);
+               uint64_t csr_address = USB_FIFO_ADDRESS(fifo->entry[i].channel, usb->index) ^ 4;
+               int words = available;
+
+               /* Limit the amount of data to waht the SW fifo has */
+               if (fifo->entry[i].size <= available) {
+                       words = fifo->entry[i].size;
+                       fifo->tail++;
+                       if (fifo->tail > MAX_CHANNELS)
+                               fifo->tail = 0;
+               }
+
+               /* Update the next locations and counts */
+               available -= words;
+               fifo->entry[i].address += words * 4;
+               fifo->entry[i].size -= words;
+
+               /*
+                * Write the HW fifo data. The read every three writes is due
+                * to an errata on CN3XXX chips
+                */
+               while (words > 3) {
+                       cvmx_write64_uint32(csr_address, *ptr++);
+                       cvmx_write64_uint32(csr_address, *ptr++);
+                       cvmx_write64_uint32(csr_address, *ptr++);
+                       cvmx_read64_uint64(CVMX_USBNX_DMA0_INB_CHN0(usb->index));
+                       words -= 3;
+               }
+               cvmx_write64_uint32(csr_address, *ptr++);
+               if (--words) {
+                       cvmx_write64_uint32(csr_address, *ptr++);
+                       if (--words)
+                               cvmx_write64_uint32(csr_address, *ptr++);
+               }
+               cvmx_read64_uint64(CVMX_USBNX_DMA0_INB_CHN0(usb->index));
+       }
+       return fifo->head != fifo->tail;
+}
+
+
+/**
+ * Check the hardware FIFOs and fill them as needed
+ *
+ * @usb:       USB device state populated by
+ *             cvmx_usb_initialize().
+ */
+static void __cvmx_usb_poll_tx_fifo(struct cvmx_usb_internal_state *usb)
+{
+       if (usb->periodic.head != usb->periodic.tail) {
+               union cvmx_usbcx_hptxsts tx_status;
+               tx_status.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HPTXSTS(usb->index));
+               if (__cvmx_usb_fill_tx_hw(usb, &usb->periodic, tx_status.s.ptxfspcavail))
+                       USB_SET_FIELD32(CVMX_USBCX_GINTMSK(usb->index), union cvmx_usbcx_gintmsk, ptxfempmsk, 1);
+               else
+                       USB_SET_FIELD32(CVMX_USBCX_GINTMSK(usb->index), union cvmx_usbcx_gintmsk, ptxfempmsk, 0);
+       }
+
+       if (usb->nonperiodic.head != usb->nonperiodic.tail) {
+               union cvmx_usbcx_gnptxsts tx_status;
+               tx_status.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_GNPTXSTS(usb->index));
+               if (__cvmx_usb_fill_tx_hw(usb, &usb->nonperiodic, tx_status.s.nptxfspcavail))
+                       USB_SET_FIELD32(CVMX_USBCX_GINTMSK(usb->index), union cvmx_usbcx_gintmsk, nptxfempmsk, 1);
+               else
+                       USB_SET_FIELD32(CVMX_USBCX_GINTMSK(usb->index), union cvmx_usbcx_gintmsk, nptxfempmsk, 0);
+       }
+
+       return;
+}
+
+
+/**
+ * Fill the TX FIFO with an outgoing packet
+ *
+ * @usb:         USB device state populated by
+ *               cvmx_usb_initialize().
+ * @channel:     Channel number to get packet from
+ */
+static void __cvmx_usb_fill_tx_fifo(struct cvmx_usb_internal_state *usb, int channel)
+{
+       union cvmx_usbcx_hccharx hcchar;
+       union cvmx_usbcx_hcspltx usbc_hcsplt;
+       union cvmx_usbcx_hctsizx usbc_hctsiz;
+       struct cvmx_usb_tx_fifo *fifo;
+
+       /* We only need to fill data on outbound channels */
+       hcchar.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCCHARX(channel, usb->index));
+       if (hcchar.s.epdir != CVMX_USB_DIRECTION_OUT)
+               return;
+
+       /* OUT Splits only have data on the start and not the complete */
+       usbc_hcsplt.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCSPLTX(channel, usb->index));
+       if (usbc_hcsplt.s.spltena && usbc_hcsplt.s.compsplt)
+               return;
+
+       /*
+        * Find out how many bytes we need to fill and convert it into 32bit
+        * words.
+        */
+       usbc_hctsiz.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCTSIZX(channel, usb->index));
+       if (!usbc_hctsiz.s.xfersize)
+               return;
+
+       if ((hcchar.s.eptype == CVMX_USB_TRANSFER_INTERRUPT) ||
+               (hcchar.s.eptype == CVMX_USB_TRANSFER_ISOCHRONOUS))
+               fifo = &usb->periodic;
+       else
+               fifo = &usb->nonperiodic;
+
+       fifo->entry[fifo->head].channel = channel;
+       fifo->entry[fifo->head].address = __cvmx_usb_read_csr64(usb, CVMX_USBNX_DMA0_OUTB_CHN0(usb->index) + channel*8);
+       fifo->entry[fifo->head].size = (usbc_hctsiz.s.xfersize+3)>>2;
+       fifo->head++;
+       if (fifo->head > MAX_CHANNELS)
+               fifo->head = 0;
+
+       __cvmx_usb_poll_tx_fifo(usb);
+
+       return;
+}
+
+/**
+ * Perform channel specific setup for Control transactions. All
+ * the generic stuff will already have been done in
+ * __cvmx_usb_start_channel()
+ *
+ * @usb:         USB device state populated by
+ *               cvmx_usb_initialize().
+ * @channel:     Channel to setup
+ * @pipe:        Pipe for control transaction
+ */
+static void __cvmx_usb_start_channel_control(struct cvmx_usb_internal_state *usb,
+                                            int channel,
+                                            struct cvmx_usb_pipe *pipe)
+{
+       struct cvmx_usb_transaction *transaction = pipe->head;
+       union cvmx_usb_control_header *header =
+               cvmx_phys_to_ptr(transaction->control_header);
+       int bytes_to_transfer = transaction->buffer_length - transaction->actual_bytes;
+       int packets_to_transfer;
+       union cvmx_usbcx_hctsizx usbc_hctsiz;
+
+       usbc_hctsiz.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCTSIZX(channel, usb->index));
+
+       switch (transaction->stage) {
+       case CVMX_USB_STAGE_NON_CONTROL:
+       case CVMX_USB_STAGE_NON_CONTROL_SPLIT_COMPLETE:
+               cvmx_dprintf("%s: ERROR - Non control stage\n", __FUNCTION__);
+               break;
+       case CVMX_USB_STAGE_SETUP:
+               usbc_hctsiz.s.pid = 3; /* Setup */
+               bytes_to_transfer = sizeof(*header);
+               /* All Control operations start with a setup going OUT */
+               USB_SET_FIELD32(CVMX_USBCX_HCCHARX(channel, usb->index), union cvmx_usbcx_hccharx, epdir, CVMX_USB_DIRECTION_OUT);
+               /*
+                * Setup send the control header instead of the buffer data. The
+                * buffer data will be used in the next stage
+                */
+               __cvmx_usb_write_csr64(usb, CVMX_USBNX_DMA0_OUTB_CHN0(usb->index) + channel*8, transaction->control_header);
+               break;
+       case CVMX_USB_STAGE_SETUP_SPLIT_COMPLETE:
+               usbc_hctsiz.s.pid = 3; /* Setup */
+               bytes_to_transfer = 0;
+               /* All Control operations start with a setup going OUT */
+               USB_SET_FIELD32(CVMX_USBCX_HCCHARX(channel, usb->index), union cvmx_usbcx_hccharx, epdir, CVMX_USB_DIRECTION_OUT);
+               USB_SET_FIELD32(CVMX_USBCX_HCSPLTX(channel, usb->index), union cvmx_usbcx_hcspltx, compsplt, 1);
+               break;
+       case CVMX_USB_STAGE_DATA:
+               usbc_hctsiz.s.pid = __cvmx_usb_get_data_pid(pipe);
+               if (__cvmx_usb_pipe_needs_split(usb, pipe)) {
+                       if (header->s.request_type & 0x80)
+                               bytes_to_transfer = 0;
+                       else if (bytes_to_transfer > pipe->max_packet)
+                               bytes_to_transfer = pipe->max_packet;
+               }
+               USB_SET_FIELD32(CVMX_USBCX_HCCHARX(channel, usb->index),
+                               union cvmx_usbcx_hccharx, epdir,
+                               ((header->s.request_type & 0x80) ?
+                                       CVMX_USB_DIRECTION_IN :
+                                       CVMX_USB_DIRECTION_OUT));
+               break;
+       case CVMX_USB_STAGE_DATA_SPLIT_COMPLETE:
+               usbc_hctsiz.s.pid = __cvmx_usb_get_data_pid(pipe);
+               if (!(header->s.request_type & 0x80))
+                       bytes_to_transfer = 0;
+               USB_SET_FIELD32(CVMX_USBCX_HCCHARX(channel, usb->index),
+                               union cvmx_usbcx_hccharx, epdir,
+                               ((header->s.request_type & 0x80) ?
+                                       CVMX_USB_DIRECTION_IN :
+                                       CVMX_USB_DIRECTION_OUT));
+               USB_SET_FIELD32(CVMX_USBCX_HCSPLTX(channel, usb->index), union cvmx_usbcx_hcspltx, compsplt, 1);
+               break;
+       case CVMX_USB_STAGE_STATUS:
+               usbc_hctsiz.s.pid = __cvmx_usb_get_data_pid(pipe);
+               bytes_to_transfer = 0;
+               USB_SET_FIELD32(CVMX_USBCX_HCCHARX(channel, usb->index), union cvmx_usbcx_hccharx, epdir,
+                               ((header->s.request_type & 0x80) ?
+                                       CVMX_USB_DIRECTION_OUT :
+                                       CVMX_USB_DIRECTION_IN));
+               break;
+       case CVMX_USB_STAGE_STATUS_SPLIT_COMPLETE:
+               usbc_hctsiz.s.pid = __cvmx_usb_get_data_pid(pipe);
+               bytes_to_transfer = 0;
+               USB_SET_FIELD32(CVMX_USBCX_HCCHARX(channel, usb->index), union cvmx_usbcx_hccharx, epdir,
+                               ((header->s.request_type & 0x80) ?
+                                       CVMX_USB_DIRECTION_OUT :
+                                       CVMX_USB_DIRECTION_IN));
+               USB_SET_FIELD32(CVMX_USBCX_HCSPLTX(channel, usb->index), union cvmx_usbcx_hcspltx, compsplt, 1);
+               break;
+       }
+
+       /*
+        * Make sure the transfer never exceeds the byte limit of the hardware.
+        * Further bytes will be sent as continued transactions
+        */
+       if (bytes_to_transfer > MAX_TRANSFER_BYTES) {
+               /* Round MAX_TRANSFER_BYTES to a multiple of out packet size */
+               bytes_to_transfer = MAX_TRANSFER_BYTES / pipe->max_packet;
+               bytes_to_transfer *= pipe->max_packet;
+       }
+
+       /*
+        * Calculate the number of packets to transfer. If the length is zero
+        * we still need to transfer one packet
+        */
+       packets_to_transfer = (bytes_to_transfer + pipe->max_packet - 1) / pipe->max_packet;
+       if (packets_to_transfer == 0)
+               packets_to_transfer = 1;
+       else if ((packets_to_transfer > 1) && (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA)) {
+               /*
+                * Limit to one packet when not using DMA. Channels must be
+                * restarted between every packet for IN transactions, so there
+                * is no reason to do multiple packets in a row
+                */
+               packets_to_transfer = 1;
+               bytes_to_transfer = packets_to_transfer * pipe->max_packet;
+       } else if (packets_to_transfer > MAX_TRANSFER_PACKETS) {
+               /*
+                * Limit the number of packet and data transferred to what the
+                * hardware can handle
+                */
+               packets_to_transfer = MAX_TRANSFER_PACKETS;
+               bytes_to_transfer = packets_to_transfer * pipe->max_packet;
+       }
+
+       usbc_hctsiz.s.xfersize = bytes_to_transfer;
+       usbc_hctsiz.s.pktcnt = packets_to_transfer;
+
+       __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCTSIZX(channel, usb->index), usbc_hctsiz.u32);
+       return;
+}
+
+
+/**
+ * Start a channel to perform the pipe's head transaction
+ *
+ * @usb:         USB device state populated by
+ *               cvmx_usb_initialize().
+ * @channel:     Channel to setup
+ * @pipe:        Pipe to start
+ */
+static void __cvmx_usb_start_channel(struct cvmx_usb_internal_state *usb,
+                                    int channel,
+                                    struct cvmx_usb_pipe *pipe)
+{
+       struct cvmx_usb_transaction *transaction = pipe->head;
+
+       /* Make sure all writes to the DMA region get flushed */
+       CVMX_SYNCW;
+
+       /* Attach the channel to the pipe */
+       usb->pipe_for_channel[channel] = pipe;
+       pipe->channel = channel;
+       pipe->flags |= __CVMX_USB_PIPE_FLAGS_SCHEDULED;
+
+       /* Mark this channel as in use */
+       usb->idle_hardware_channels &= ~(1<<channel);
+
+       /* Enable the channel interrupt bits */
+       {
+               union cvmx_usbcx_hcintx usbc_hcint;
+               union cvmx_usbcx_hcintmskx usbc_hcintmsk;
+               union cvmx_usbcx_haintmsk usbc_haintmsk;
+
+               /* Clear all channel status bits */
+               usbc_hcint.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCINTX(channel, usb->index));
+               __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCINTX(channel, usb->index), usbc_hcint.u32);
+
+               usbc_hcintmsk.u32 = 0;
+               usbc_hcintmsk.s.chhltdmsk = 1;
+               if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA) {
+                       /*
+                        * Channels need these extra interrupts when we aren't
+                        * in DMA mode.
+                        */
+                       usbc_hcintmsk.s.datatglerrmsk = 1;
+                       usbc_hcintmsk.s.frmovrunmsk = 1;
+                       usbc_hcintmsk.s.bblerrmsk = 1;
+                       usbc_hcintmsk.s.xacterrmsk = 1;
+                       if (__cvmx_usb_pipe_needs_split(usb, pipe)) {
+                               /*
+                                * Splits don't generate xfercompl, so we need
+                                * ACK and NYET.
+                                */
+                               usbc_hcintmsk.s.nyetmsk = 1;
+                               usbc_hcintmsk.s.ackmsk = 1;
+                       }
+                       usbc_hcintmsk.s.nakmsk = 1;
+                       usbc_hcintmsk.s.stallmsk = 1;
+                       usbc_hcintmsk.s.xfercomplmsk = 1;
+               }
+               __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCINTMSKX(channel, usb->index), usbc_hcintmsk.u32);
+
+               /* Enable the channel interrupt to propagate */
+               usbc_haintmsk.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HAINTMSK(usb->index));
+               usbc_haintmsk.s.haintmsk |= 1<<channel;
+               __cvmx_usb_write_csr32(usb, CVMX_USBCX_HAINTMSK(usb->index), usbc_haintmsk.u32);
+       }
+
+       /* Setup the locations the DMA engines use  */
+       {
+               uint64_t dma_address = transaction->buffer + transaction->actual_bytes;
+               if (transaction->type == CVMX_USB_TRANSFER_ISOCHRONOUS)
+                       dma_address = transaction->buffer + transaction->iso_packets[0].offset + transaction->actual_bytes;
+               __cvmx_usb_write_csr64(usb, CVMX_USBNX_DMA0_OUTB_CHN0(usb->index) + channel*8, dma_address);
+               __cvmx_usb_write_csr64(usb, CVMX_USBNX_DMA0_INB_CHN0(usb->index) + channel*8, dma_address);
+       }
+
+       /* Setup both the size of the transfer and the SPLIT characteristics */
+       {
+               union cvmx_usbcx_hcspltx usbc_hcsplt = {.u32 = 0};
+               union cvmx_usbcx_hctsizx usbc_hctsiz = {.u32 = 0};
+               int packets_to_transfer;
+               int bytes_to_transfer = transaction->buffer_length - transaction->actual_bytes;
+
+               /*
+                * ISOCHRONOUS transactions store each individual transfer size
+                * in the packet structure, not the global buffer_length
+                */
+               if (transaction->type == CVMX_USB_TRANSFER_ISOCHRONOUS)
+                       bytes_to_transfer = transaction->iso_packets[0].length - transaction->actual_bytes;
+
+               /*
+                * We need to do split transactions when we are talking to non
+                * high speed devices that are behind a high speed hub
+                */
+               if (__cvmx_usb_pipe_needs_split(usb, pipe)) {
+                       /*
+                        * On the start split phase (stage is even) record the
+                        * frame number we will need to send the split complete.
+                        * We only store the lower two bits since the time ahead
+                        * can only be two frames
+                        */
+                       if ((transaction->stage&1) == 0) {
+                               if (transaction->type == CVMX_USB_TRANSFER_BULK)
+                                       pipe->split_sc_frame = (usb->frame_number + 1) & 0x7f;
+                               else
+                                       pipe->split_sc_frame = (usb->frame_number + 2) & 0x7f;
+                       } else
+                               pipe->split_sc_frame = -1;
+
+                       usbc_hcsplt.s.spltena = 1;
+                       usbc_hcsplt.s.hubaddr = pipe->hub_device_addr;
+                       usbc_hcsplt.s.prtaddr = pipe->hub_port;
+                       usbc_hcsplt.s.compsplt = (transaction->stage == CVMX_USB_STAGE_NON_CONTROL_SPLIT_COMPLETE);
+
+                       /*
+                        * SPLIT transactions can only ever transmit one data
+                        * packet so limit the transfer size to the max packet
+                        * size
+                        */
+                       if (bytes_to_transfer > pipe->max_packet)
+                               bytes_to_transfer = pipe->max_packet;
+
+                       /*
+                        * ISOCHRONOUS OUT splits are unique in that they limit
+                        * data transfers to 188 byte chunks representing the
+                        * begin/middle/end of the data or all
+                        */
+                       if (!usbc_hcsplt.s.compsplt &&
+                               (pipe->transfer_dir == CVMX_USB_DIRECTION_OUT) &&
+                               (pipe->transfer_type == CVMX_USB_TRANSFER_ISOCHRONOUS)) {
+                               /*
+                                * Clear the split complete frame number as
+                                * there isn't going to be a split complete
+                                */
+                               pipe->split_sc_frame = -1;
+                               /*
+                                * See if we've started this transfer and sent
+                                * data
+                                */
+                               if (transaction->actual_bytes == 0) {
+                                       /*
+                                        * Nothing sent yet, this is either a
+                                        * begin or the entire payload
+                                        */
+                                       if (bytes_to_transfer <= 188)
+                                               /* Entire payload in one go */
+                                               usbc_hcsplt.s.xactpos = 3;
+                                       else
+                                               /* First part of payload */
+                                               usbc_hcsplt.s.xactpos = 2;
+                               } else {
+                                       /*
+                                        * Continuing the previous data, we must
+                                        * either be in the middle or at the end
+                                        */
+                                       if (bytes_to_transfer <= 188)
+                                               /* End of payload */
+                                               usbc_hcsplt.s.xactpos = 1;
+                                       else
+                                               /* Middle of payload */
+                                               usbc_hcsplt.s.xactpos = 0;
+                               }
+                               /*
+                                * Again, the transfer size is limited to 188
+                                * bytes
+                                */
+                               if (bytes_to_transfer > 188)
+                                       bytes_to_transfer = 188;
+                       }
+               }
+
+               /*
+                * Make sure the transfer never exceeds the byte limit of the
+                * hardware. Further bytes will be sent as continued
+                * transactions
+                */
+               if (bytes_to_transfer > MAX_TRANSFER_BYTES) {
+                       /*
+                        * Round MAX_TRANSFER_BYTES to a multiple of out packet
+                        * size
+                        */
+                       bytes_to_transfer = MAX_TRANSFER_BYTES / pipe->max_packet;
+                       bytes_to_transfer *= pipe->max_packet;
+               }
+
+               /*
+                * Calculate the number of packets to transfer. If the length is
+                * zero we still need to transfer one packet
+                */
+               packets_to_transfer = (bytes_to_transfer + pipe->max_packet - 1) / pipe->max_packet;
+               if (packets_to_transfer == 0)
+                       packets_to_transfer = 1;
+               else if ((packets_to_transfer > 1) && (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA)) {
+                       /*
+                        * Limit to one packet when not using DMA. Channels must
+                        * be restarted between every packet for IN
+                        * transactions, so there is no reason to do multiple
+                        * packets in a row
+                        */
+                       packets_to_transfer = 1;
+                       bytes_to_transfer = packets_to_transfer * pipe->max_packet;
+               } else if (packets_to_transfer > MAX_TRANSFER_PACKETS) {
+                       /*
+                        * Limit the number of packet and data transferred to
+                        * what the hardware can handle
+                        */
+                       packets_to_transfer = MAX_TRANSFER_PACKETS;
+                       bytes_to_transfer = packets_to_transfer * pipe->max_packet;
+               }
+
+               usbc_hctsiz.s.xfersize = bytes_to_transfer;
+               usbc_hctsiz.s.pktcnt = packets_to_transfer;
+
+               /* Update the DATA0/DATA1 toggle */
+               usbc_hctsiz.s.pid = __cvmx_usb_get_data_pid(pipe);
+               /*
+                * High speed pipes may need a hardware ping before they start
+                */
+               if (pipe->flags & __CVMX_USB_PIPE_FLAGS_NEED_PING)
+                       usbc_hctsiz.s.dopng = 1;
+
+               __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCSPLTX(channel, usb->index), usbc_hcsplt.u32);
+               __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCTSIZX(channel, usb->index), usbc_hctsiz.u32);
+       }
+
+       /* Setup the Host Channel Characteristics Register */
+       {
+               union cvmx_usbcx_hccharx usbc_hcchar = {.u32 = 0};
+
+               /*
+                * Set the startframe odd/even properly. This is only used for
+                * periodic
+                */
+               usbc_hcchar.s.oddfrm = usb->frame_number&1;
+
+               /*
+                * Set the number of back to back packets allowed by this
+                * endpoint. Split transactions interpret "ec" as the number of
+                * immediate retries of failure. These retries happen too
+                * quickly, so we disable these entirely for splits
+                */
+               if (__cvmx_usb_pipe_needs_split(usb, pipe))
+                       usbc_hcchar.s.ec = 1;
+               else if (pipe->multi_count < 1)
+                       usbc_hcchar.s.ec = 1;
+               else if (pipe->multi_count > 3)
+                       usbc_hcchar.s.ec = 3;
+               else
+                       usbc_hcchar.s.ec = pipe->multi_count;
+
+               /* Set the rest of the endpoint specific settings */
+               usbc_hcchar.s.devaddr = pipe->device_addr;
+               usbc_hcchar.s.eptype = transaction->type;
+               usbc_hcchar.s.lspddev = (pipe->device_speed == CVMX_USB_SPEED_LOW);
+               usbc_hcchar.s.epdir = pipe->transfer_dir;
+               usbc_hcchar.s.epnum = pipe->endpoint_num;
+               usbc_hcchar.s.mps = pipe->max_packet;
+               __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCCHARX(channel, usb->index), usbc_hcchar.u32);
+       }
+
+       /* Do transaction type specific fixups as needed */
+       switch (transaction->type) {
+       case CVMX_USB_TRANSFER_CONTROL:
+               __cvmx_usb_start_channel_control(usb, channel, pipe);
+               break;
+       case CVMX_USB_TRANSFER_BULK:
+       case CVMX_USB_TRANSFER_INTERRUPT:
+               break;
+       case CVMX_USB_TRANSFER_ISOCHRONOUS:
+               if (!__cvmx_usb_pipe_needs_split(usb, pipe)) {
+                       /*
+                        * ISO transactions require different PIDs depending on
+                        * direction and how many packets are needed
+                        */
+                       if (pipe->transfer_dir == CVMX_USB_DIRECTION_OUT) {
+                               if (pipe->multi_count < 2) /* Need DATA0 */
+                                       USB_SET_FIELD32(CVMX_USBCX_HCTSIZX(channel, usb->index), union cvmx_usbcx_hctsizx, pid, 0);
+                               else /* Need MDATA */
+                                       USB_SET_FIELD32(CVMX_USBCX_HCTSIZX(channel, usb->index), union cvmx_usbcx_hctsizx, pid, 3);
+                       }
+               }
+               break;
+       }
+       {
+               union cvmx_usbcx_hctsizx usbc_hctsiz = {.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCTSIZX(channel, usb->index))};
+               transaction->xfersize = usbc_hctsiz.s.xfersize;
+               transaction->pktcnt = usbc_hctsiz.s.pktcnt;
+       }
+       /* Remeber when we start a split transaction */
+       if (__cvmx_usb_pipe_needs_split(usb, pipe))
+               usb->active_split = transaction;
+       USB_SET_FIELD32(CVMX_USBCX_HCCHARX(channel, usb->index), union cvmx_usbcx_hccharx, chena, 1);
+       if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA)
+               __cvmx_usb_fill_tx_fifo(usb, channel);
+       return;
+}
+
+
+/**
+ * Find a pipe that is ready to be scheduled to hardware.
+ * @usb:        USB device state populated by
+ *              cvmx_usb_initialize().
+ * @list:       Pipe list to search
+ * @current_frame:
+ *              Frame counter to use as a time reference.
+ *
+ * Returns: Pipe or NULL if none are ready
+ */
+static struct cvmx_usb_pipe *__cvmx_usb_find_ready_pipe(struct cvmx_usb_internal_state *usb, struct cvmx_usb_pipe_list *list, uint64_t current_frame)
+{
+       struct cvmx_usb_pipe *pipe = list->head;
+       while (pipe) {
+               if (!(pipe->flags & __CVMX_USB_PIPE_FLAGS_SCHEDULED) && pipe->head &&
+                       (pipe->next_tx_frame <= current_frame) &&
+                       ((pipe->split_sc_frame == -1) || ((((int)current_frame - (int)pipe->split_sc_frame) & 0x7f) < 0x40)) &&
+                       (!usb->active_split || (usb->active_split == pipe->head))) {
+                       CVMX_PREFETCH(pipe, 128);
+                       CVMX_PREFETCH(pipe->head, 0);
+                       return pipe;
+               }
+               pipe = pipe->next;
+       }
+       return NULL;
+}
+
+
+/**
+ * Called whenever a pipe might need to be scheduled to the
+ * hardware.
+ *
+ * @usb:        USB device state populated by
+ *              cvmx_usb_initialize().
+ * @is_sof:     True if this schedule was called on a SOF interrupt.
+ */
+static void __cvmx_usb_schedule(struct cvmx_usb_internal_state *usb, int is_sof)
+{
+       int channel;
+       struct cvmx_usb_pipe *pipe;
+       int need_sof;
+       enum cvmx_usb_transfer ttype;
+
+       if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA) {
+               /*
+                * Without DMA we need to be careful to not schedule something
+                * at the end of a frame and cause an overrun.
+                */
+               union cvmx_usbcx_hfnum hfnum = {.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HFNUM(usb->index))};
+               union cvmx_usbcx_hfir hfir = {.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HFIR(usb->index))};
+               if (hfnum.s.frrem < hfir.s.frint/4)
+                       goto done;
+       }
+
+       while (usb->idle_hardware_channels) {
+               /* Find an idle channel */
+               channel = __fls(usb->idle_hardware_channels);
+               if (unlikely(channel > 7))
+                       break;
+
+               /* Find a pipe needing service */
+               pipe = NULL;
+               if (is_sof) {
+                       /*
+                        * Only process periodic pipes on SOF interrupts. This
+                        * way we are sure that the periodic data is sent in the
+                        * beginning of the frame
+                        */
+                       pipe = __cvmx_usb_find_ready_pipe(usb, usb->active_pipes + CVMX_USB_TRANSFER_ISOCHRONOUS, usb->frame_number);
+                       if (likely(!pipe))
+                               pipe = __cvmx_usb_find_ready_pipe(usb, usb->active_pipes + CVMX_USB_TRANSFER_INTERRUPT, usb->frame_number);
+               }
+               if (likely(!pipe)) {
+                       pipe = __cvmx_usb_find_ready_pipe(usb, usb->active_pipes + CVMX_USB_TRANSFER_CONTROL, usb->frame_number);
+                       if (likely(!pipe))
+                               pipe = __cvmx_usb_find_ready_pipe(usb, usb->active_pipes + CVMX_USB_TRANSFER_BULK, usb->frame_number);
+               }
+               if (!pipe)
+                       break;
+
+               __cvmx_usb_start_channel(usb, channel, pipe);
+       }
+
+done:
+       /*
+        * Only enable SOF interrupts when we have transactions pending in the
+        * future that might need to be scheduled
+        */
+       need_sof = 0;
+       for (ttype = CVMX_USB_TRANSFER_CONTROL; ttype <= CVMX_USB_TRANSFER_INTERRUPT; ttype++) {
+               pipe = usb->active_pipes[ttype].head;
+               while (pipe) {
+                       if (pipe->next_tx_frame > usb->frame_number) {
+                               need_sof = 1;
+                               break;
+                       }
+                       pipe = pipe->next;
+               }
+       }
+       USB_SET_FIELD32(CVMX_USBCX_GINTMSK(usb->index), union cvmx_usbcx_gintmsk, sofmsk, need_sof);
+       return;
+}
+
+
+/**
+ * Call a user's callback for a specific reason.
+ *
+ * @usb:        USB device state populated by
+ *              cvmx_usb_initialize().
+ * @pipe:       Pipe the callback is for or NULL
+ * @transaction:
+ *              Transaction the callback is for or NULL
+ * @reason:     Reason this callback is being called
+ * @complete_code:
+ *              Completion code for the transaction, if any
+ */
+static void __cvmx_usb_perform_callback(struct cvmx_usb_internal_state *usb,
+                                       struct cvmx_usb_pipe *pipe,
+                                       struct cvmx_usb_transaction *transaction,
+                                       enum cvmx_usb_callback reason,
+                                       enum cvmx_usb_complete complete_code)
+{
+       cvmx_usb_callback_func_t callback = usb->callback[reason];
+       void *user_data = usb->callback_data[reason];
+       int submit_handle = -1;
+       int pipe_handle = -1;
+       int bytes_transferred = 0;
+
+       if (pipe)
+               pipe_handle = __cvmx_usb_get_pipe_handle(usb, pipe);
+
+       if (transaction) {
+               submit_handle = __cvmx_usb_get_submit_handle(usb, transaction);
+               bytes_transferred = transaction->actual_bytes;
+               /* Transactions are allowed to override the default callback */
+               if ((reason == CVMX_USB_CALLBACK_TRANSFER_COMPLETE) && transaction->callback) {
+                       callback = transaction->callback;
+                       user_data = transaction->callback_data;
+               }
+       }
+
+       if (!callback)
+               return;
+
+       callback((struct cvmx_usb_state *)usb, reason, complete_code, pipe_handle, submit_handle,
+                bytes_transferred, user_data);
+}
+
+
+/**
+ * Signal the completion of a transaction and free it. The
+ * transaction will be removed from the pipe transaction list.
+ *
+ * @usb:        USB device state populated by
+ *              cvmx_usb_initialize().
+ * @pipe:       Pipe the transaction is on
+ * @transaction:
+ *              Transaction that completed
+ * @complete_code:
+ *              Completion code
+ */
+static void __cvmx_usb_perform_complete(struct cvmx_usb_internal_state *usb,
+                                       struct cvmx_usb_pipe *pipe,
+                                       struct cvmx_usb_transaction *transaction,
+                                       enum cvmx_usb_complete complete_code)
+{
+       /* If this was a split then clear our split in progress marker */
+       if (usb->active_split == transaction)
+               usb->active_split = NULL;
+
+       /*
+        * Isochronous transactions need extra processing as they might not be
+        * done after a single data transfer
+        */
+       if (unlikely(transaction->type == CVMX_USB_TRANSFER_ISOCHRONOUS)) {
+               /* Update the number of bytes transferred in this ISO packet */
+               transaction->iso_packets[0].length = transaction->actual_bytes;
+               transaction->iso_packets[0].status = complete_code;
+
+               /*
+                * If there are more ISOs pending and we succeeded, schedule the
+                * next one
+                */
+               if ((transaction->iso_number_packets > 1) && (complete_code == CVMX_USB_COMPLETE_SUCCESS)) {
+                       /* No bytes transferred for this packet as of yet */
+                       transaction->actual_bytes = 0;
+                       /* One less ISO waiting to transfer */
+                       transaction->iso_number_packets--;
+                       /* Increment to the next location in our packet array */
+                       transaction->iso_packets++;
+                       transaction->stage = CVMX_USB_STAGE_NON_CONTROL;
+                       goto done;
+               }
+       }
+
+       /* Remove the transaction from the pipe list */
+       if (transaction->next)
+               transaction->next->prev = transaction->prev;
+       else
+               pipe->tail = transaction->prev;
+       if (transaction->prev)
+               transaction->prev->next = transaction->next;
+       else
+               pipe->head = transaction->next;
+       if (!pipe->head) {
+               __cvmx_usb_remove_pipe(usb->active_pipes + pipe->transfer_type, pipe);
+               __cvmx_usb_append_pipe(&usb->idle_pipes, pipe);
+
+       }
+       __cvmx_usb_perform_callback(usb, pipe, transaction,
+                                   CVMX_USB_CALLBACK_TRANSFER_COMPLETE,
+                                   complete_code);
+       __cvmx_usb_free_transaction(usb, transaction);
+done:
+       return;
+}
+
+
+/**
+ * Submit a usb transaction to a pipe. Called for all types
+ * of transactions.
+ *
+ * @usb:
+ * @pipe_handle:
+ *                 Which pipe to submit to. Will be validated in this function.
+ * @type:          Transaction type
+ * @buffer:        User buffer for the transaction
+ * @buffer_length:
+ *                 User buffer's length in bytes
+ * @control_header:
+ *                 For control transactions, the 8 byte standard header
+ * @iso_start_frame:
+ *                 For ISO transactions, the start frame
+ * @iso_number_packets:
+ *                 For ISO, the number of packet in the transaction.
+ * @iso_packets:
+ *                 A description of each ISO packet
+ * @callback:      User callback to call when the transaction completes
+ * @user_data:     User's data for the callback
+ *
+ * Returns: Submit handle or negative on failure. Matches the result
+ *         in the external API.
+ */
+static int __cvmx_usb_submit_transaction(struct cvmx_usb_internal_state *usb,
+                                        int pipe_handle,
+                                        enum cvmx_usb_transfer type,
+                                        uint64_t buffer,
+                                        int buffer_length,
+                                        uint64_t control_header,
+                                        int iso_start_frame,
+                                        int iso_number_packets,
+                                        struct cvmx_usb_iso_packet *iso_packets,
+                                        cvmx_usb_callback_func_t callback,
+                                        void *user_data)
+{
+       int submit_handle;
+       struct cvmx_usb_transaction *transaction;
+       struct cvmx_usb_pipe *pipe = usb->pipe + pipe_handle;
+
+       if (unlikely((pipe_handle < 0) || (pipe_handle >= MAX_PIPES)))
+               return -EINVAL;
+       /* Fail if the pipe isn't open */
+       if (unlikely((pipe->flags & __CVMX_USB_PIPE_FLAGS_OPEN) == 0))
+               return -EINVAL;
+       if (unlikely(pipe->transfer_type != type))
+               return -EINVAL;
+
+       transaction = __cvmx_usb_alloc_transaction(usb);
+       if (unlikely(!transaction))
+               return -ENOMEM;
+
+       transaction->type = type;
+       transaction->buffer = buffer;
+       transaction->buffer_length = buffer_length;
+       transaction->control_header = control_header;
+       /* FIXME: This is not used, implement it. */
+       transaction->iso_start_frame = iso_start_frame;
+       transaction->iso_number_packets = iso_number_packets;
+       transaction->iso_packets = iso_packets;
+       transaction->callback = callback;
+       transaction->callback_data = user_data;
+       if (transaction->type == CVMX_USB_TRANSFER_CONTROL)
+               transaction->stage = CVMX_USB_STAGE_SETUP;
+       else
+               transaction->stage = CVMX_USB_STAGE_NON_CONTROL;
+
+       transaction->next = NULL;
+       if (pipe->tail) {
+               transaction->prev = pipe->tail;
+               transaction->prev->next = transaction;
+       } else {
+               if (pipe->next_tx_frame < usb->frame_number)
+                       pipe->next_tx_frame = usb->frame_number + pipe->interval -
+                               (usb->frame_number - pipe->next_tx_frame) % pipe->interval;
+               transaction->prev = NULL;
+               pipe->head = transaction;
+               __cvmx_usb_remove_pipe(&usb->idle_pipes, pipe);
+               __cvmx_usb_append_pipe(usb->active_pipes + pipe->transfer_type, pipe);
+       }
+       pipe->tail = transaction;
+
+       submit_handle = __cvmx_usb_get_submit_handle(usb, transaction);
+
+       /* We may need to schedule the pipe if this was the head of the pipe */
+       if (!transaction->prev)
+               __cvmx_usb_schedule(usb, 0);
+
+       return submit_handle;
+}
+
+
+/**
+ * Call to submit a USB Bulk transfer to a pipe.
+ *
+ * @state:         USB device state populated by
+ *                 cvmx_usb_initialize().
+ * @pipe_handle:
+ *                 Handle to the pipe for the transfer.
+ * @buffer:        Physical address of the data buffer in
+ *                 memory. Note that this is NOT A POINTER, but
+ *                 the full 64bit physical address of the
+ *                 buffer. This may be zero if buffer_length is
+ *                 zero.
+ * @buffer_length:
+ *                 Length of buffer in bytes.
+ * @callback:      Function to call when this transaction
+ *                 completes. If the return value of this
+ *                 function isn't an error, then this function
+ *                 is guaranteed to be called when the
+ *                 transaction completes. If this parameter is
+ *                 NULL, then the generic callback registered
+ *                 through cvmx_usb_register_callback is
+ *                 called. If both are NULL, then there is no
+ *                 way to know when a transaction completes.
+ * @user_data:     User supplied data returned when the
+ *                 callback is called. This is only used if
+ *                 callback in not NULL.
+ *
+ * Returns: A submitted transaction handle or negative on
+ *         failure. Negative values are error codes.
+ */
+static int cvmx_usb_submit_bulk(struct cvmx_usb_state *state, int pipe_handle,
+                               uint64_t buffer, int buffer_length,
+                               cvmx_usb_callback_func_t callback,
+                               void *user_data)
+{
+       int submit_handle;
+       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
+
+       /* Pipe handle checking is done later in a common place */
+       if (unlikely(!buffer))
+               return -EINVAL;
+       if (unlikely(buffer_length < 0))
+               return -EINVAL;
+
+       submit_handle = __cvmx_usb_submit_transaction(usb, pipe_handle,
+                                                     CVMX_USB_TRANSFER_BULK,
+                                                     buffer,
+                                                     buffer_length,
+                                                     0, /* control_header */
+                                                     0, /* iso_start_frame */
+                                                     0, /* iso_number_packets */
+                                                     NULL, /* iso_packets */
+                                                     callback,
+                                                     user_data);
+       return submit_handle;
+}
+
+
+/**
+ * Call to submit a USB Interrupt transfer to a pipe.
+ *
+ * @state:         USB device state populated by
+ *                 cvmx_usb_initialize().
+ * @pipe_handle:
+ *                 Handle to the pipe for the transfer.
+ * @buffer:        Physical address of the data buffer in
+ *                 memory. Note that this is NOT A POINTER, but
+ *                 the full 64bit physical address of the
+ *                 buffer. This may be zero if buffer_length is
+ *                 zero.
+ * @buffer_length:
+ *                 Length of buffer in bytes.
+ * @callback:      Function to call when this transaction
+ *                 completes. If the return value of this
+ *                 function isn't an error, then this function
+ *                 is guaranteed to be called when the
+ *                 transaction completes. If this parameter is
+ *                 NULL, then the generic callback registered
+ *                 through cvmx_usb_register_callback is
+ *                 called. If both are NULL, then there is no
+ *                 way to know when a transaction completes.
+ * @user_data:     User supplied data returned when the
+ *                 callback is called. This is only used if
+ *                 callback in not NULL.
+ *
+ * Returns: A submitted transaction handle or negative on
+ *         failure. Negative values are error codes.
+ */
+static int cvmx_usb_submit_interrupt(struct cvmx_usb_state *state,
+                                    int pipe_handle, uint64_t buffer,
+                                    int buffer_length,
+                                    cvmx_usb_callback_func_t callback,
+                                    void *user_data)
+{
+       int submit_handle;
+       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
+
+       /* Pipe handle checking is done later in a common place */
+       if (unlikely(!buffer))
+               return -EINVAL;
+       if (unlikely(buffer_length < 0))
+               return -EINVAL;
+
+       submit_handle = __cvmx_usb_submit_transaction(usb, pipe_handle,
+                                                     CVMX_USB_TRANSFER_INTERRUPT,
+                                                     buffer,
+                                                     buffer_length,
+                                                     0, /* control_header */
+                                                     0, /* iso_start_frame */
+                                                     0, /* iso_number_packets */
+                                                     NULL, /* iso_packets */
+                                                     callback,
+                                                     user_data);
+       return submit_handle;
+}
+
+
+/**
+ * Call to submit a USB Control transfer to a pipe.
+ *
+ * @state:         USB device state populated by
+ *                 cvmx_usb_initialize().
+ * @pipe_handle:
+ *                 Handle to the pipe for the transfer.
+ * @control_header:
+ *                 USB 8 byte control header physical address.
+ *                 Note that this is NOT A POINTER, but the
+ *                 full 64bit physical address of the buffer.
+ * @buffer:        Physical address of the data buffer in
+ *                 memory. Note that this is NOT A POINTER, but
+ *                 the full 64bit physical address of the
+ *                 buffer. This may be zero if buffer_length is
+ *                 zero.
+ * @buffer_length:
+ *                 Length of buffer in bytes.
+ * @callback:      Function to call when this transaction
+ *                 completes. If the return value of this
+ *                 function isn't an error, then this function
+ *                 is guaranteed to be called when the
+ *                 transaction completes. If this parameter is
+ *                 NULL, then the generic callback registered
+ *                 through cvmx_usb_register_callback is
+ *                 called. If both are NULL, then there is no
+ *                 way to know when a transaction completes.
+ * @user_data:     User supplied data returned when the
+ *                 callback is called. This is only used if
+ *                 callback in not NULL.
+ *
+ * Returns: A submitted transaction handle or negative on
+ *         failure. Negative values are error codes.
+ */
+static int cvmx_usb_submit_control(struct cvmx_usb_state *state,
+                                  int pipe_handle, uint64_t control_header,
+                                  uint64_t buffer, int buffer_length,
+                                  cvmx_usb_callback_func_t callback,
+                                  void *user_data)
+{
+       int submit_handle;
+       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
+       union cvmx_usb_control_header *header =
+               cvmx_phys_to_ptr(control_header);
+
+       /* Pipe handle checking is done later in a common place */
+       if (unlikely(!control_header))
+               return -EINVAL;
+       /* Some drivers send a buffer with a zero length. God only knows why */
+       if (unlikely(buffer && (buffer_length < 0)))
+               return -EINVAL;
+       if (unlikely(!buffer && (buffer_length != 0)))
+               return -EINVAL;
+       if ((header->s.request_type & 0x80) == 0)
+               buffer_length = le16_to_cpu(header->s.length);
+
+       submit_handle = __cvmx_usb_submit_transaction(usb, pipe_handle,
+                                                     CVMX_USB_TRANSFER_CONTROL,
+                                                     buffer,
+                                                     buffer_length,
+                                                     control_header,
+                                                     0, /* iso_start_frame */
+                                                     0, /* iso_number_packets */
+                                                     NULL, /* iso_packets */
+                                                     callback,
+                                                     user_data);
+       return submit_handle;
+}
+
+
+/**
+ * Call to submit a USB Isochronous transfer to a pipe.
+ *
+ * @state:         USB device state populated by
+ *                 cvmx_usb_initialize().
+ * @pipe_handle:
+ *                 Handle to the pipe for the transfer.
+ * @start_frame:
+ *                 Number of frames into the future to schedule
+ *                 this transaction.
+ * @number_packets:
+ *                 Number of sequential packets to transfer.
+ *                 "packets" is a pointer to an array of this
+ *                 many packet structures.
+ * @packets:       Description of each transfer packet as
+ *                 defined by struct cvmx_usb_iso_packet. The array
+ *                 pointed to here must stay valid until the
+ *                 complete callback is called.
+ * @buffer:        Physical address of the data buffer in
+ *                 memory. Note that this is NOT A POINTER, but
+ *                 the full 64bit physical address of the
+ *                 buffer. This may be zero if buffer_length is
+ *                 zero.
+ * @buffer_length:
+ *                 Length of buffer in bytes.
+ * @callback:      Function to call when this transaction
+ *                 completes. If the return value of this
+ *                 function isn't an error, then this function
+ *                 is guaranteed to be called when the
+ *                 transaction completes. If this parameter is
+ *                 NULL, then the generic callback registered
+ *                 through cvmx_usb_register_callback is
+ *                 called. If both are NULL, then there is no
+ *                 way to know when a transaction completes.
+ * @user_data:     User supplied data returned when the
+ *                 callback is called. This is only used if
+ *                 callback in not NULL.
+ *
+ * Returns: A submitted transaction handle or negative on
+ *         failure. Negative values are error codes.
+ */
+static int cvmx_usb_submit_isochronous(struct cvmx_usb_state *state,
+                                      int pipe_handle, int start_frame,
+                                      int number_packets, struct
+                                      cvmx_usb_iso_packet packets[],
+                                      uint64_t buffer, int buffer_length,
+                                      cvmx_usb_callback_func_t callback,
+                                      void *user_data)
+{
+       int submit_handle;
+       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
+
+       /* Pipe handle checking is done later in a common place */
+       if (unlikely(start_frame < 0))
+               return -EINVAL;
+       if (unlikely(number_packets < 1))
+               return -EINVAL;
+       if (unlikely(!packets))
+               return -EINVAL;
+       if (unlikely(!buffer))
+               return -EINVAL;
+       if (unlikely(buffer_length < 0))
+               return -EINVAL;
+
+       submit_handle = __cvmx_usb_submit_transaction(usb, pipe_handle,
+                                                     CVMX_USB_TRANSFER_ISOCHRONOUS,
+                                                     buffer,
+                                                     buffer_length,
+                                                     0, /* control_header */
+                                                     start_frame,
+                                                     number_packets,
+                                                     packets,
+                                                     callback,
+                                                     user_data);
+       return submit_handle;
+}
+
+
+/**
+ * Cancel one outstanding request in a pipe. Canceling a request
+ * can fail if the transaction has already completed before cancel
+ * is called. Even after a successful cancel call, it may take
+ * a frame or two for the cvmx_usb_poll() function to call the
+ * associated callback.
+ *
+ * @state:      USB device state populated by
+ *              cvmx_usb_initialize().
+ * @pipe_handle:
+ *              Pipe handle to cancel requests in.
+ * @submit_handle:
+ *              Handle to transaction to cancel, returned by the submit
+ *              function.
+ *
+ * Returns: 0 or a negative error code.
+ */
+static int cvmx_usb_cancel(struct cvmx_usb_state *state, int pipe_handle,
+                          int submit_handle)
+{
+       struct cvmx_usb_transaction *transaction;
+       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
+       struct cvmx_usb_pipe *pipe = usb->pipe + pipe_handle;
+
+       if (unlikely((pipe_handle < 0) || (pipe_handle >= MAX_PIPES)))
+               return -EINVAL;
+       if (unlikely((submit_handle < 0) || (submit_handle >= MAX_TRANSACTIONS)))
+               return -EINVAL;
+
+       /* Fail if the pipe isn't open */
+       if (unlikely((pipe->flags & __CVMX_USB_PIPE_FLAGS_OPEN) == 0))
+               return -EINVAL;
+
+       transaction = usb->transaction + submit_handle;
+
+       /* Fail if this transaction already completed */
+       if (unlikely((transaction->flags & __CVMX_USB_TRANSACTION_FLAGS_IN_USE) == 0))
+               return -EINVAL;
+
+       /*
+        * If the transaction is the HEAD of the queue and scheduled. We need to
+        * treat it special
+        */
+       if ((pipe->head == transaction) &&
+               (pipe->flags & __CVMX_USB_PIPE_FLAGS_SCHEDULED)) {
+               union cvmx_usbcx_hccharx usbc_hcchar;
+
+               usb->pipe_for_channel[pipe->channel] = NULL;
+               pipe->flags &= ~__CVMX_USB_PIPE_FLAGS_SCHEDULED;
+
+               CVMX_SYNCW;
+
+               usbc_hcchar.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCCHARX(pipe->channel, usb->index));
+               /*
+                * If the channel isn't enabled then the transaction already
+                * completed.
+                */
+               if (usbc_hcchar.s.chena) {
+                       usbc_hcchar.s.chdis = 1;
+                       __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCCHARX(pipe->channel, usb->index), usbc_hcchar.u32);
+               }
+       }
+       __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_CANCEL);
+       return 0;
+}
+
+
+/**
+ * Cancel all outstanding requests in a pipe. Logically all this
+ * does is call cvmx_usb_cancel() in a loop.
+ *
+ * @state:      USB device state populated by
+ *              cvmx_usb_initialize().
+ * @pipe_handle:
+ *              Pipe handle to cancel requests in.
+ *
+ * Returns: 0 or a negative error code.
+ */
+static int cvmx_usb_cancel_all(struct cvmx_usb_state *state, int pipe_handle)
+{
+       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
+       struct cvmx_usb_pipe *pipe = usb->pipe + pipe_handle;
+
+       if (unlikely((pipe_handle < 0) || (pipe_handle >= MAX_PIPES)))
+               return -EINVAL;
+
+       /* Fail if the pipe isn't open */
+       if (unlikely((pipe->flags & __CVMX_USB_PIPE_FLAGS_OPEN) == 0))
+               return -EINVAL;
+
+       /* Simply loop through and attempt to cancel each transaction */
+       while (pipe->head) {
+               int result = cvmx_usb_cancel(state, pipe_handle,
+                       __cvmx_usb_get_submit_handle(usb, pipe->head));
+               if (unlikely(result != 0))
+                       return result;
+       }
+       return 0;
+}
+
+
+/**
+ * Close a pipe created with cvmx_usb_open_pipe().
+ *
+ * @state:      USB device state populated by
+ *              cvmx_usb_initialize().
+ * @pipe_handle:
+ *              Pipe handle to close.
+ *
+ * Returns: 0 or a negative error code. EBUSY is returned if the pipe has
+ *         outstanding transfers.
+ */
+static int cvmx_usb_close_pipe(struct cvmx_usb_state *state, int pipe_handle)
+{
+       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
+       struct cvmx_usb_pipe *pipe = usb->pipe + pipe_handle;
+
+       if (unlikely((pipe_handle < 0) || (pipe_handle >= MAX_PIPES)))
+               return -EINVAL;
+
+       /* Fail if the pipe isn't open */
+       if (unlikely((pipe->flags & __CVMX_USB_PIPE_FLAGS_OPEN) == 0))
+               return -EINVAL;
+
+       /* Fail if the pipe has pending transactions */
+       if (unlikely(pipe->head))
+               return -EBUSY;
+
+       pipe->flags = 0;
+       __cvmx_usb_remove_pipe(&usb->idle_pipes, pipe);
+       __cvmx_usb_append_pipe(&usb->free_pipes, pipe);
+
+       return 0;
+}
+
+
+/**
+ * Register a function to be called when various USB events occur.
+ *
+ * @state:     USB device state populated by
+ *            cvmx_usb_initialize().
+ * @reason:    Which event to register for.
+ * @callback:  Function to call when the event occurs.
+ * @user_data: User data parameter to the function.
+ *
+ * Returns: 0 or a negative error code.
+ */
+static int cvmx_usb_register_callback(struct cvmx_usb_state *state,
+                                     enum cvmx_usb_callback reason,
+                                     cvmx_usb_callback_func_t callback,
+                                     void *user_data)
+{
+       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
+
+       if (unlikely(reason >= __CVMX_USB_CALLBACK_END))
+               return -EINVAL;
+       if (unlikely(!callback))
+               return -EINVAL;
+
+       usb->callback[reason] = callback;
+       usb->callback_data[reason] = user_data;
+
+       return 0;
+}
+
+
+/**
+ * Get the current USB protocol level frame number. The frame
+ * number is always in the range of 0-0x7ff.
+ *
+ * @state: USB device state populated by
+ *        cvmx_usb_initialize().
+ *
+ * Returns: USB frame number
+ */
+static int cvmx_usb_get_frame_number(struct cvmx_usb_state *state)
+{
+       int frame_number;
+       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
+       union cvmx_usbcx_hfnum usbc_hfnum;
+
+       usbc_hfnum.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HFNUM(usb->index));
+       frame_number = usbc_hfnum.s.frnum;
+
+       return frame_number;
+}
+
+
+/**
+ * Poll a channel for status
+ *
+ * @usb:     USB device
+ * @channel: Channel to poll
+ *
+ * Returns: Zero on success
+ */
+static int __cvmx_usb_poll_channel(struct cvmx_usb_internal_state *usb, int channel)
+{
+       union cvmx_usbcx_hcintx usbc_hcint;
+       union cvmx_usbcx_hctsizx usbc_hctsiz;
+       union cvmx_usbcx_hccharx usbc_hcchar;
+       struct cvmx_usb_pipe *pipe;
+       struct cvmx_usb_transaction *transaction;
+       int bytes_this_transfer;
+       int bytes_in_last_packet;
+       int packets_processed;
+       int buffer_space_left;
+
+       /* Read the interrupt status bits for the channel */
+       usbc_hcint.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCINTX(channel, usb->index));
+
+       if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA) {
+               usbc_hcchar.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCCHARX(channel, usb->index));
+
+               if (usbc_hcchar.s.chena && usbc_hcchar.s.chdis) {
+                       /*
+                        * There seems to be a bug in CN31XX which can cause
+                        * interrupt IN transfers to get stuck until we do a
+                        * write of HCCHARX without changing things
+                        */
+                       __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCCHARX(channel, usb->index), usbc_hcchar.u32);
+                       return 0;
+               }
+
+               /*
+                * In non DMA mode the channels don't halt themselves. We need
+                * to manually disable channels that are left running
+                */
+               if (!usbc_hcint.s.chhltd) {
+                       if (usbc_hcchar.s.chena) {
+                               union cvmx_usbcx_hcintmskx hcintmsk;
+                               /* Disable all interrupts except CHHLTD */
+                               hcintmsk.u32 = 0;
+                               hcintmsk.s.chhltdmsk = 1;
+                               __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCINTMSKX(channel, usb->index), hcintmsk.u32);
+                               usbc_hcchar.s.chdis = 1;
+                               __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCCHARX(channel, usb->index), usbc_hcchar.u32);
+                               return 0;
+                       } else if (usbc_hcint.s.xfercompl) {
+                               /*
+                                * Successful IN/OUT with transfer complete.
+                                * Channel halt isn't needed.
+                                */
+                       } else {
+                               cvmx_dprintf("USB%d: Channel %d interrupt without halt\n", usb->index, channel);
+                               return 0;
+                       }
+               }
+       } else {
+               /*
+                * There is are no interrupts that we need to process when the
+                * channel is still running
+                */
+               if (!usbc_hcint.s.chhltd)
+                       return 0;
+       }
+
+       /* Disable the channel interrupts now that it is done */
+       __cvmx_usb_write_csr32(usb, CVMX_USBCX_HCINTMSKX(channel, usb->index), 0);
+       usb->idle_hardware_channels |= (1<<channel);
+
+       /* Make sure this channel is tied to a valid pipe */
+       pipe = usb->pipe_for_channel[channel];
+       CVMX_PREFETCH(pipe, 0);
+       CVMX_PREFETCH(pipe, 128);
+       if (!pipe)
+               return 0;
+       transaction = pipe->head;
+       CVMX_PREFETCH(transaction, 0);
+
+       /*
+        * Disconnect this pipe from the HW channel. Later the schedule
+        * function will figure out which pipe needs to go
+        */
+       usb->pipe_for_channel[channel] = NULL;
+       pipe->flags &= ~__CVMX_USB_PIPE_FLAGS_SCHEDULED;
+
+       /*
+        * Read the channel config info so we can figure out how much data
+        * transfered
+        */
+       usbc_hcchar.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCCHARX(channel, usb->index));
+       usbc_hctsiz.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HCTSIZX(channel, usb->index));
+
+       /*
+        * Calculating the number of bytes successfully transferred is dependent
+        * on the transfer direction
+        */
+       packets_processed = transaction->pktcnt - usbc_hctsiz.s.pktcnt;
+       if (usbc_hcchar.s.epdir) {
+               /*
+                * IN transactions are easy. For every byte received the
+                * hardware decrements xfersize. All we need to do is subtract
+                * the current value of xfersize from its starting value and we
+                * know how many bytes were written to the buffer
+                */
+               bytes_this_transfer = transaction->xfersize - usbc_hctsiz.s.xfersize;
+       } else {
+               /*
+                * OUT transaction don't decrement xfersize. Instead pktcnt is
+                * decremented on every successful packet send. The hardware
+                * does this when it receives an ACK, or NYET. If it doesn't
+                * receive one of these responses pktcnt doesn't change
+                */
+               bytes_this_transfer = packets_processed * usbc_hcchar.s.mps;
+               /*
+                * The last packet may not be a full transfer if we didn't have
+                * enough data
+                */
+               if (bytes_this_transfer > transaction->xfersize)
+                       bytes_this_transfer = transaction->xfersize;
+       }
+       /* Figure out how many bytes were in the last packet of the transfer */
+       if (packets_processed)
+               bytes_in_last_packet = bytes_this_transfer - (packets_processed-1) * usbc_hcchar.s.mps;
+       else
+               bytes_in_last_packet = bytes_this_transfer;
+
+       /*
+        * As a special case, setup transactions output the setup header, not
+        * the user's data. For this reason we don't count setup data as bytes
+        * transferred
+        */
+       if ((transaction->stage == CVMX_USB_STAGE_SETUP) ||
+               (transaction->stage == CVMX_USB_STAGE_SETUP_SPLIT_COMPLETE))
+               bytes_this_transfer = 0;
+
+       /*
+        * Add the bytes transferred to the running total. It is important that
+        * bytes_this_transfer doesn't count any data that needs to be
+        * retransmitted
+        */
+       transaction->actual_bytes += bytes_this_transfer;
+       if (transaction->type == CVMX_USB_TRANSFER_ISOCHRONOUS)
+               buffer_space_left = transaction->iso_packets[0].length - transaction->actual_bytes;
+       else
+               buffer_space_left = transaction->buffer_length - transaction->actual_bytes;
+
+       /*
+        * We need to remember the PID toggle state for the next transaction.
+        * The hardware already updated it for the next transaction
+        */
+       pipe->pid_toggle = !(usbc_hctsiz.s.pid == 0);
+
+       /*
+        * For high speed bulk out, assume the next transaction will need to do
+        * a ping before proceeding. If this isn't true the ACK processing below
+        * will clear this flag
+        */
+       if ((pipe->device_speed == CVMX_USB_SPEED_HIGH) &&
+               (pipe->transfer_type == CVMX_USB_TRANSFER_BULK) &&
+               (pipe->transfer_dir == CVMX_USB_DIRECTION_OUT))
+               pipe->flags |= __CVMX_USB_PIPE_FLAGS_NEED_PING;
+
+       if (usbc_hcint.s.stall) {
+               /*
+                * STALL as a response means this transaction cannot be
+                * completed because the device can't process transactions. Tell
+                * the user. Any data that was transferred will be counted on
+                * the actual bytes transferred
+                */
+               pipe->pid_toggle = 0;
+               __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_STALL);
+       } else if (usbc_hcint.s.xacterr) {
+               /*
+                * We know at least one packet worked if we get a ACK or NAK.
+                * Reset the retry counter
+                */
+               if (usbc_hcint.s.nak || usbc_hcint.s.ack)
+                       transaction->retries = 0;
+               transaction->retries++;
+               if (transaction->retries > MAX_RETRIES) {
+                       /*
+                        * XactErr as a response means the device signaled
+                        * something wrong with the transfer. For example, PID
+                        * toggle errors cause these
+                        */
+                       __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_XACTERR);
+               } else {
+                       /*
+                        * If this was a split then clear our split in progress
+                        * marker
+                        */
+                       if (usb->active_split == transaction)
+                               usb->active_split = NULL;
+                       /*
+                        * Rewind to the beginning of the transaction by anding
+                        * off the split complete bit
+                        */
+                       transaction->stage &= ~1;
+                       pipe->split_sc_frame = -1;
+                       pipe->next_tx_frame += pipe->interval;
+                       if (pipe->next_tx_frame < usb->frame_number)
+                               pipe->next_tx_frame = usb->frame_number + pipe->interval -
+                                                     (usb->frame_number - pipe->next_tx_frame) % pipe->interval;
+               }
+       } else if (usbc_hcint.s.bblerr) {
+               /* Babble Error (BblErr) */
+               __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_BABBLEERR);
+       } else if (usbc_hcint.s.datatglerr) {
+               /* We'll retry the exact same transaction again */
+               transaction->retries++;
+       } else if (usbc_hcint.s.nyet) {
+               /*
+                * NYET as a response is only allowed in three cases: as a
+                * response to a ping, as a response to a split transaction, and
+                * as a response to a bulk out. The ping case is handled by
+                * hardware, so we only have splits and bulk out
+                */
+               if (!__cvmx_usb_pipe_needs_split(usb, pipe)) {
+                       transaction->retries = 0;
+                       /*
+                        * If there is more data to go then we need to try
+                        * again. Otherwise this transaction is complete
+                        */
+                       if ((buffer_space_left == 0) || (bytes_in_last_packet < pipe->max_packet))
+                               __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_SUCCESS);
+               } else {
+                       /*
+                        * Split transactions retry the split complete 4 times
+                        * then rewind to the start split and do the entire
+                        * transactions again
+                        */
+                       transaction->retries++;
+                       if ((transaction->retries & 0x3) == 0) {
+                               /*
+                                * Rewind to the beginning of the transaction by
+                                * anding off the split complete bit
+                                */
+                               transaction->stage &= ~1;
+                               pipe->split_sc_frame = -1;
+                       }
+               }
+       } else if (usbc_hcint.s.ack) {
+               transaction->retries = 0;
+               /*
+                * The ACK bit can only be checked after the other error bits.
+                * This is because a multi packet transfer may succeed in a
+                * number of packets and then get a different response on the
+                * last packet. In this case both ACK and the last response bit
+                * will be set. If none of the other response bits is set, then
+                * the last packet must have been an ACK
+                *
+                * Since we got an ACK, we know we don't need to do a ping on
+                * this pipe
+                */
+               pipe->flags &= ~__CVMX_USB_PIPE_FLAGS_NEED_PING;
+
+               switch (transaction->type) {
+               case CVMX_USB_TRANSFER_CONTROL:
+                       switch (transaction->stage) {
+                       case CVMX_USB_STAGE_NON_CONTROL:
+                       case CVMX_USB_STAGE_NON_CONTROL_SPLIT_COMPLETE:
+                               /* This should be impossible */
+                               __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_ERROR);
+                               break;
+                       case CVMX_USB_STAGE_SETUP:
+                               pipe->pid_toggle = 1;
+                               if (__cvmx_usb_pipe_needs_split(usb, pipe))
+                                       transaction->stage = CVMX_USB_STAGE_SETUP_SPLIT_COMPLETE;
+                               else {
+                                       union cvmx_usb_control_header *header =
+                                               cvmx_phys_to_ptr(transaction->control_header);
+                                       if (header->s.length)
+                                               transaction->stage = CVMX_USB_STAGE_DATA;
+                                       else
+                                               transaction->stage = CVMX_USB_STAGE_STATUS;
+                               }
+                               break;
+                       case CVMX_USB_STAGE_SETUP_SPLIT_COMPLETE:
+                               {
+                                       union cvmx_usb_control_header *header =
+                                               cvmx_phys_to_ptr(transaction->control_header);
+                                       if (header->s.length)
+                                               transaction->stage = CVMX_USB_STAGE_DATA;
+                                       else
+                                               transaction->stage = CVMX_USB_STAGE_STATUS;
+                               }
+                               break;
+                       case CVMX_USB_STAGE_DATA:
+                               if (__cvmx_usb_pipe_needs_split(usb, pipe)) {
+                                       transaction->stage = CVMX_USB_STAGE_DATA_SPLIT_COMPLETE;
+                                       /*
+                                        * For setup OUT data that are splits,
+                                        * the hardware doesn't appear to count
+                                        * transferred data. Here we manually
+                                        * update the data transferred
+                                        */
+                                       if (!usbc_hcchar.s.epdir) {
+                                               if (buffer_space_left < pipe->max_packet)
+                                                       transaction->actual_bytes += buffer_space_left;
+                                               else
+                                                       transaction->actual_bytes += pipe->max_packet;
+                                       }
+                               } else if ((buffer_space_left == 0) || (bytes_in_last_packet < pipe->max_packet)) {
+                                       pipe->pid_toggle = 1;
+                                       transaction->stage = CVMX_USB_STAGE_STATUS;
+                               }
+                               break;
+                       case CVMX_USB_STAGE_DATA_SPLIT_COMPLETE:
+                               if ((buffer_space_left == 0) || (bytes_in_last_packet < pipe->max_packet)) {
+                                       pipe->pid_toggle = 1;
+                                       transaction->stage = CVMX_USB_STAGE_STATUS;
+                               } else {
+                                       transaction->stage = CVMX_USB_STAGE_DATA;
+                               }
+                               break;
+                       case CVMX_USB_STAGE_STATUS:
+                               if (__cvmx_usb_pipe_needs_split(usb, pipe))
+                                       transaction->stage = CVMX_USB_STAGE_STATUS_SPLIT_COMPLETE;
+                               else
+                                       __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_SUCCESS);
+                               break;
+                       case CVMX_USB_STAGE_STATUS_SPLIT_COMPLETE:
+                               __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_SUCCESS);
+                               break;
+                       }
+                       break;
+               case CVMX_USB_TRANSFER_BULK:
+               case CVMX_USB_TRANSFER_INTERRUPT:
+                       /*
+                        * The only time a bulk transfer isn't complete when it
+                        * finishes with an ACK is during a split transaction.
+                        * For splits we need to continue the transfer if more
+                        * data is needed
+                        */
+                       if (__cvmx_usb_pipe_needs_split(usb, pipe)) {
+                               if (transaction->stage == CVMX_USB_STAGE_NON_CONTROL)
+                                       transaction->stage = CVMX_USB_STAGE_NON_CONTROL_SPLIT_COMPLETE;
+                               else {
+                                       if (buffer_space_left && (bytes_in_last_packet == pipe->max_packet))
+                                               transaction->stage = CVMX_USB_STAGE_NON_CONTROL;
+                                       else {
+                                               if (transaction->type == CVMX_USB_TRANSFER_INTERRUPT)
+                                                       pipe->next_tx_frame += pipe->interval;
+                                                       __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_SUCCESS);
+                                       }
+                               }
+                       } else {
+                               if ((pipe->device_speed == CVMX_USB_SPEED_HIGH) &&
+                                   (pipe->transfer_type == CVMX_USB_TRANSFER_BULK) &&
+                                   (pipe->transfer_dir == CVMX_USB_DIRECTION_OUT) &&
+                                   (usbc_hcint.s.nak))
+                                       pipe->flags |= __CVMX_USB_PIPE_FLAGS_NEED_PING;
+                               if (!buffer_space_left || (bytes_in_last_packet < pipe->max_packet)) {
+                                       if (transaction->type == CVMX_USB_TRANSFER_INTERRUPT)
+                                               pipe->next_tx_frame += pipe->interval;
+                                       __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_SUCCESS);
+                               }
+                       }
+                       break;
+               case CVMX_USB_TRANSFER_ISOCHRONOUS:
+                       if (__cvmx_usb_pipe_needs_split(usb, pipe)) {
+                               /*
+                                * ISOCHRONOUS OUT splits don't require a
+                                * complete split stage. Instead they use a
+                                * sequence of begin OUT splits to transfer the
+                                * data 188 bytes at a time. Once the transfer
+                                * is complete, the pipe sleeps until the next
+                                * schedule interval
+                                */
+                               if (pipe->transfer_dir == CVMX_USB_DIRECTION_OUT) {
+                                       /*
+                                        * If no space left or this wasn't a max
+                                        * size packet then this transfer is
+                                        * complete. Otherwise start it again to
+                                        * send the next 188 bytes
+                                        */
+                                       if (!buffer_space_left || (bytes_this_transfer < 188)) {
+                                               pipe->next_tx_frame += pipe->interval;
+                                               __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_SUCCESS);
+                                       }
+                               } else {
+                                       if (transaction->stage == CVMX_USB_STAGE_NON_CONTROL_SPLIT_COMPLETE) {
+                                               /*
+                                                * We are in the incoming data
+                                                * phase. Keep getting data
+                                                * until we run out of space or
+                                                * get a small packet
+                                                */
+                                               if ((buffer_space_left == 0) || (bytes_in_last_packet < pipe->max_packet)) {
+                                                       pipe->next_tx_frame += pipe->interval;
+                                                       __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_SUCCESS);
+                                               }
+                                       } else
+                                               transaction->stage = CVMX_USB_STAGE_NON_CONTROL_SPLIT_COMPLETE;
+                               }
+                       } else {
+                               pipe->next_tx_frame += pipe->interval;
+                               __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_SUCCESS);
+                       }
+                       break;
+               }
+       } else if (usbc_hcint.s.nak) {
+               /*
+                * If this was a split then clear our split in progress marker.
+                */
+               if (usb->active_split == transaction)
+                       usb->active_split = NULL;
+               /*
+                * NAK as a response means the device couldn't accept the
+                * transaction, but it should be retried in the future. Rewind
+                * to the beginning of the transaction by anding off the split
+                * complete bit. Retry in the next interval
+                */
+               transaction->retries = 0;
+               transaction->stage &= ~1;
+               pipe->next_tx_frame += pipe->interval;
+               if (pipe->next_tx_frame < usb->frame_number)
+                       pipe->next_tx_frame = usb->frame_number + pipe->interval -
+                               (usb->frame_number - pipe->next_tx_frame) % pipe->interval;
+       } else {
+               struct cvmx_usb_port_status port;
+               port = cvmx_usb_get_status((struct cvmx_usb_state *)usb);
+               if (port.port_enabled) {
+                       /* We'll retry the exact same transaction again */
+                       transaction->retries++;
+               } else {
+                       /*
+                        * We get channel halted interrupts with no result bits
+                        * sets when the cable is unplugged
+                        */
+                       __cvmx_usb_perform_complete(usb, pipe, transaction, CVMX_USB_COMPLETE_ERROR);
+               }
+       }
+       return 0;
+}
+
+
+/**
+ * Poll the USB block for status and call all needed callback
+ * handlers. This function is meant to be called in the interrupt
+ * handler for the USB controller. It can also be called
+ * periodically in a loop for non-interrupt based operation.
+ *
+ * @state:     USB device state populated by
+ *             cvmx_usb_initialize().
+ *
+ * Returns: 0 or a negative error code.
+ */
+static int cvmx_usb_poll(struct cvmx_usb_state *state)
+{
+       union cvmx_usbcx_hfnum usbc_hfnum;
+       union cvmx_usbcx_gintsts usbc_gintsts;
+       struct cvmx_usb_internal_state *usb = (struct cvmx_usb_internal_state *)state;
+
+       CVMX_PREFETCH(usb, 0);
+       CVMX_PREFETCH(usb, 1*128);
+       CVMX_PREFETCH(usb, 2*128);
+       CVMX_PREFETCH(usb, 3*128);
+       CVMX_PREFETCH(usb, 4*128);
+
+       /* Update the frame counter */
+       usbc_hfnum.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HFNUM(usb->index));
+       if ((usb->frame_number&0x3fff) > usbc_hfnum.s.frnum)
+               usb->frame_number += 0x4000;
+       usb->frame_number &= ~0x3fffull;
+       usb->frame_number |= usbc_hfnum.s.frnum;
+
+       /* Read the pending interrupts */
+       usbc_gintsts.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_GINTSTS(usb->index));
+
+       /* Clear the interrupts now that we know about them */
+       __cvmx_usb_write_csr32(usb, CVMX_USBCX_GINTSTS(usb->index), usbc_gintsts.u32);
+
+       if (usbc_gintsts.s.rxflvl) {
+               /*
+                * RxFIFO Non-Empty (RxFLvl)
+                * Indicates that there is at least one packet pending to be
+                * read from the RxFIFO.
+                *
+                * In DMA mode this is handled by hardware
+                */
+               if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA)
+                       __cvmx_usb_poll_rx_fifo(usb);
+       }
+       if (usbc_gintsts.s.ptxfemp || usbc_gintsts.s.nptxfemp) {
+               /* Fill the Tx FIFOs when not in DMA mode */
+               if (usb->init_flags & CVMX_USB_INITIALIZE_FLAGS_NO_DMA)
+                       __cvmx_usb_poll_tx_fifo(usb);
+       }
+       if (usbc_gintsts.s.disconnint || usbc_gintsts.s.prtint) {
+               union cvmx_usbcx_hprt usbc_hprt;
+               /*
+                * Disconnect Detected Interrupt (DisconnInt)
+                * Asserted when a device disconnect is detected.
+                *
+                * Host Port Interrupt (PrtInt)
+                * The core sets this bit to indicate a change in port status of
+                * one of the O2P USB core ports in Host mode. The application
+                * must read the Host Port Control and Status (HPRT) register to
+                * determine the exact event that caused this interrupt. The
+                * application must clear the appropriate status bit in the Host
+                * Port Control and Status register to clear this bit.
+                *
+                * Call the user's port callback
+                */
+               __cvmx_usb_perform_callback(usb, NULL, NULL,
+                                           CVMX_USB_CALLBACK_PORT_CHANGED,
+                                           CVMX_USB_COMPLETE_SUCCESS);
+               /* Clear the port change bits */
+               usbc_hprt.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HPRT(usb->index));
+               usbc_hprt.s.prtena = 0;
+               __cvmx_usb_write_csr32(usb, CVMX_USBCX_HPRT(usb->index), usbc_hprt.u32);
+       }
+       if (usbc_gintsts.s.hchint) {
+               /*
+                * Host Channels Interrupt (HChInt)
+                * The core sets this bit to indicate that an interrupt is
+                * pending on one of the channels of the core (in Host mode).
+                * The application must read the Host All Channels Interrupt
+                * (HAINT) register to determine the exact number of the channel
+                * on which the interrupt occurred, and then read the
+                * corresponding Host Channel-n Interrupt (HCINTn) register to
+                * determine the exact cause of the interrupt. The application
+                * must clear the appropriate status bit in the HCINTn register
+                * to clear this bit.
+                */
+               union cvmx_usbcx_haint usbc_haint;
+               usbc_haint.u32 = __cvmx_usb_read_csr32(usb, CVMX_USBCX_HAINT(usb->index));
+               while (usbc_haint.u32) {
+                       int channel;
+
+                       channel = __fls(usbc_haint.u32);
+                       __cvmx_usb_poll_channel(usb, channel);
+                       usbc_haint.u32 ^= 1<<channel;
+               }
+       }
+
+       __cvmx_usb_schedule(usb, usbc_gintsts.s.sof);
+
+       return 0;
+}
+
 /* convert between an HCD pointer and the corresponding struct octeon_hcd */
 static inline struct octeon_hcd *hcd_to_octeon(struct usb_hcd *hcd)
 {