--- /dev/null
+/*
+ * Copyright (c) 2008 Rodolfo Giometti <giometti@linux.it>
+ * Copyright (c) 2008 Eurotech S.p.A. <info@eurtech.it>
+ *
+ * This code is *strongly* based on EHCI-HCD code by David Brownell since
+ * the chip is a quasi-EHCI compatible.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/dmapool.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/reboot.h>
+#include <linux/usb.h>
+#include <linux/moduleparam.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+
+#include "../core/hcd.h"
+
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/unaligned.h>
+
+#include <linux/irq.h>
+#include <linux/platform_device.h>
+
+#include "oxu210hp.h"
+
+#define DRIVER_VERSION "0.0.50"
+
+/*
+ * Main defines
+ */
+
+#define oxu_dbg(oxu, fmt, args...) \
+ dev_dbg(oxu_to_hcd(oxu)->self.controller , fmt , ## args)
+#define oxu_err(oxu, fmt, args...) \
+ dev_err(oxu_to_hcd(oxu)->self.controller , fmt , ## args)
+#define oxu_info(oxu, fmt, args...) \
+ dev_info(oxu_to_hcd(oxu)->self.controller , fmt , ## args)
+
+static inline struct usb_hcd *oxu_to_hcd(struct oxu_hcd *oxu)
+{
+ return container_of((void *) oxu, struct usb_hcd, hcd_priv);
+}
+
+static inline struct oxu_hcd *hcd_to_oxu(struct usb_hcd *hcd)
+{
+ return (struct oxu_hcd *) (hcd->hcd_priv);
+}
+
+/*
+ * Debug stuff
+ */
+
+#undef OXU_URB_TRACE
+#undef OXU_VERBOSE_DEBUG
+
+#ifdef OXU_VERBOSE_DEBUG
+#define oxu_vdbg oxu_dbg
+#else
+#define oxu_vdbg(oxu, fmt, args...) /* Nop */
+#endif
+
+#ifdef DEBUG
+
+static int __attribute__((__unused__))
+dbg_status_buf(char *buf, unsigned len, const char *label, u32 status)
+{
+ return scnprintf(buf, len, "%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s",
+ label, label[0] ? " " : "", status,
+ (status & STS_ASS) ? " Async" : "",
+ (status & STS_PSS) ? " Periodic" : "",
+ (status & STS_RECL) ? " Recl" : "",
+ (status & STS_HALT) ? " Halt" : "",
+ (status & STS_IAA) ? " IAA" : "",
+ (status & STS_FATAL) ? " FATAL" : "",
+ (status & STS_FLR) ? " FLR" : "",
+ (status & STS_PCD) ? " PCD" : "",
+ (status & STS_ERR) ? " ERR" : "",
+ (status & STS_INT) ? " INT" : ""
+ );
+}
+
+static int __attribute__((__unused__))
+dbg_intr_buf(char *buf, unsigned len, const char *label, u32 enable)
+{
+ return scnprintf(buf, len, "%s%sintrenable %02x%s%s%s%s%s%s",
+ label, label[0] ? " " : "", enable,
+ (enable & STS_IAA) ? " IAA" : "",
+ (enable & STS_FATAL) ? " FATAL" : "",
+ (enable & STS_FLR) ? " FLR" : "",
+ (enable & STS_PCD) ? " PCD" : "",
+ (enable & STS_ERR) ? " ERR" : "",
+ (enable & STS_INT) ? " INT" : ""
+ );
+}
+
+static const char *const fls_strings[] =
+ { "1024", "512", "256", "??" };
+
+static int dbg_command_buf(char *buf, unsigned len,
+ const char *label, u32 command)
+{
+ return scnprintf(buf, len,
+ "%s%scommand %06x %s=%d ithresh=%d%s%s%s%s period=%s%s %s",
+ label, label[0] ? " " : "", command,
+ (command & CMD_PARK) ? "park" : "(park)",
+ CMD_PARK_CNT(command),
+ (command >> 16) & 0x3f,
+ (command & CMD_LRESET) ? " LReset" : "",
+ (command & CMD_IAAD) ? " IAAD" : "",
+ (command & CMD_ASE) ? " Async" : "",
+ (command & CMD_PSE) ? " Periodic" : "",
+ fls_strings[(command >> 2) & 0x3],
+ (command & CMD_RESET) ? " Reset" : "",
+ (command & CMD_RUN) ? "RUN" : "HALT"
+ );
+}
+
+static int dbg_port_buf(char *buf, unsigned len, const char *label,
+ int port, u32 status)
+{
+ char *sig;
+
+ /* signaling state */
+ switch (status & (3 << 10)) {
+ case 0 << 10:
+ sig = "se0";
+ break;
+ case 1 << 10:
+ sig = "k"; /* low speed */
+ break;
+ case 2 << 10:
+ sig = "j";
+ break;
+ default:
+ sig = "?";
+ break;
+ }
+
+ return scnprintf(buf, len,
+ "%s%sport %d status %06x%s%s sig=%s%s%s%s%s%s%s%s%s%s",
+ label, label[0] ? " " : "", port, status,
+ (status & PORT_POWER) ? " POWER" : "",
+ (status & PORT_OWNER) ? " OWNER" : "",
+ sig,
+ (status & PORT_RESET) ? " RESET" : "",
+ (status & PORT_SUSPEND) ? " SUSPEND" : "",
+ (status & PORT_RESUME) ? " RESUME" : "",
+ (status & PORT_OCC) ? " OCC" : "",
+ (status & PORT_OC) ? " OC" : "",
+ (status & PORT_PEC) ? " PEC" : "",
+ (status & PORT_PE) ? " PE" : "",
+ (status & PORT_CSC) ? " CSC" : "",
+ (status & PORT_CONNECT) ? " CONNECT" : ""
+ );
+}
+
+#else
+
+static inline int __attribute__((__unused__))
+dbg_status_buf(char *buf, unsigned len, const char *label, u32 status)
+{ return 0; }
+
+static inline int __attribute__((__unused__))
+dbg_command_buf(char *buf, unsigned len, const char *label, u32 command)
+{ return 0; }
+
+static inline int __attribute__((__unused__))
+dbg_intr_buf(char *buf, unsigned len, const char *label, u32 enable)
+{ return 0; }
+
+static inline int __attribute__((__unused__))
+dbg_port_buf(char *buf, unsigned len, const char *label, int port, u32 status)
+{ return 0; }
+
+#endif /* DEBUG */
+
+/* functions have the "wrong" filename when they're output... */
+#define dbg_status(oxu, label, status) { \
+ char _buf[80]; \
+ dbg_status_buf(_buf, sizeof _buf, label, status); \
+ oxu_dbg(oxu, "%s\n", _buf); \
+}
+
+#define dbg_cmd(oxu, label, command) { \
+ char _buf[80]; \
+ dbg_command_buf(_buf, sizeof _buf, label, command); \
+ oxu_dbg(oxu, "%s\n", _buf); \
+}
+
+#define dbg_port(oxu, label, port, status) { \
+ char _buf[80]; \
+ dbg_port_buf(_buf, sizeof _buf, label, port, status); \
+ oxu_dbg(oxu, "%s\n", _buf); \
+}
+
+/*
+ * Module parameters
+ */
+
+/* Initial IRQ latency: faster than hw default */
+static int log2_irq_thresh; /* 0 to 6 */
+module_param(log2_irq_thresh, int, S_IRUGO);
+MODULE_PARM_DESC(log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
+
+/* Initial park setting: slower than hw default */
+static unsigned park;
+module_param(park, uint, S_IRUGO);
+MODULE_PARM_DESC(park, "park setting; 1-3 back-to-back async packets");
+
+/* For flakey hardware, ignore overcurrent indicators */
+static int ignore_oc;
+module_param(ignore_oc, bool, S_IRUGO);
+MODULE_PARM_DESC(ignore_oc, "ignore bogus hardware overcurrent indications");
+
+
+static void ehci_work(struct oxu_hcd *oxu);
+static int oxu_hub_control(struct usb_hcd *hcd,
+ u16 typeReq, u16 wValue, u16 wIndex,
+ char *buf, u16 wLength);
+
+/*
+ * Local functions
+ */
+
+/* Low level read/write registers functions */
+static inline u32 oxu_readl(void *base, u32 reg)
+{
+ return readl(base + reg);
+}
+
+static inline void oxu_writel(void *base, u32 reg, u32 val)
+{
+ writel(val, base + reg);
+}
+
+static inline void timer_action_done(struct oxu_hcd *oxu,
+ enum ehci_timer_action action)
+{
+ clear_bit(action, &oxu->actions);
+}
+
+static inline void timer_action(struct oxu_hcd *oxu,
+ enum ehci_timer_action action)
+{
+ if (!test_and_set_bit(action, &oxu->actions)) {
+ unsigned long t;
+
+ switch (action) {
+ case TIMER_IAA_WATCHDOG:
+ t = EHCI_IAA_JIFFIES;
+ break;
+ case TIMER_IO_WATCHDOG:
+ t = EHCI_IO_JIFFIES;
+ break;
+ case TIMER_ASYNC_OFF:
+ t = EHCI_ASYNC_JIFFIES;
+ break;
+ case TIMER_ASYNC_SHRINK:
+ default:
+ t = EHCI_SHRINK_JIFFIES;
+ break;
+ }
+ t += jiffies;
+ /* all timings except IAA watchdog can be overridden.
+ * async queue SHRINK often precedes IAA. while it's ready
+ * to go OFF neither can matter, and afterwards the IO
+ * watchdog stops unless there's still periodic traffic.
+ */
+ if (action != TIMER_IAA_WATCHDOG
+ && t > oxu->watchdog.expires
+ && timer_pending(&oxu->watchdog))
+ return;
+ mod_timer(&oxu->watchdog, t);
+ }
+}
+
+/*
+ * handshake - spin reading hc until handshake completes or fails
+ * @ptr: address of hc register to be read
+ * @mask: bits to look at in result of read
+ * @done: value of those bits when handshake succeeds
+ * @usec: timeout in microseconds
+ *
+ * Returns negative errno, or zero on success
+ *
+ * Success happens when the "mask" bits have the specified value (hardware
+ * handshake done). There are two failure modes: "usec" have passed (major
+ * hardware flakeout), or the register reads as all-ones (hardware removed).
+ *
+ * That last failure should_only happen in cases like physical cardbus eject
+ * before driver shutdown. But it also seems to be caused by bugs in cardbus
+ * bridge shutdown: shutting down the bridge before the devices using it.
+ */
+static int handshake(struct oxu_hcd *oxu, void __iomem *ptr,
+ u32 mask, u32 done, int usec)
+{
+ u32 result;
+
+ do {
+ result = readl(ptr);
+ if (result == ~(u32)0) /* card removed */
+ return -ENODEV;
+ result &= mask;
+ if (result == done)
+ return 0;
+ udelay(1);
+ usec--;
+ } while (usec > 0);
+ return -ETIMEDOUT;
+}
+
+/* Force HC to halt state from unknown (EHCI spec section 2.3) */
+static int ehci_halt(struct oxu_hcd *oxu)
+{
+ u32 temp = readl(&oxu->regs->status);
+
+ /* disable any irqs left enabled by previous code */
+ writel(0, &oxu->regs->intr_enable);
+
+ if ((temp & STS_HALT) != 0)
+ return 0;
+
+ temp = readl(&oxu->regs->command);
+ temp &= ~CMD_RUN;
+ writel(temp, &oxu->regs->command);
+ return handshake(oxu, &oxu->regs->status,
+ STS_HALT, STS_HALT, 16 * 125);
+}
+
+/* Put TDI/ARC silicon into EHCI mode */
+static void tdi_reset(struct oxu_hcd *oxu)
+{
+ u32 __iomem *reg_ptr;
+ u32 tmp;
+
+ reg_ptr = (u32 __iomem *)(((u8 __iomem *)oxu->regs) + 0x68);
+ tmp = readl(reg_ptr);
+ tmp |= 0x3;
+ writel(tmp, reg_ptr);
+}
+
+/* Reset a non-running (STS_HALT == 1) controller */
+static int ehci_reset(struct oxu_hcd *oxu)
+{
+ int retval;
+ u32 command = readl(&oxu->regs->command);
+
+ command |= CMD_RESET;
+ dbg_cmd(oxu, "reset", command);
+ writel(command, &oxu->regs->command);
+ oxu_to_hcd(oxu)->state = HC_STATE_HALT;
+ oxu->next_statechange = jiffies;
+ retval = handshake(oxu, &oxu->regs->command,
+ CMD_RESET, 0, 250 * 1000);
+
+ if (retval)
+ return retval;
+
+ tdi_reset(oxu);
+
+ return retval;
+}
+
+/* Idle the controller (from running) */
+static void ehci_quiesce(struct oxu_hcd *oxu)
+{
+ u32 temp;
+
+#ifdef DEBUG
+ if (!HC_IS_RUNNING(oxu_to_hcd(oxu)->state))
+ BUG();
+#endif
+
+ /* wait for any schedule enables/disables to take effect */
+ temp = readl(&oxu->regs->command) << 10;
+ temp &= STS_ASS | STS_PSS;
+ if (handshake(oxu, &oxu->regs->status, STS_ASS | STS_PSS,
+ temp, 16 * 125) != 0) {
+ oxu_to_hcd(oxu)->state = HC_STATE_HALT;
+ return;
+ }
+
+ /* then disable anything that's still active */
+ temp = readl(&oxu->regs->command);
+ temp &= ~(CMD_ASE | CMD_IAAD | CMD_PSE);
+ writel(temp, &oxu->regs->command);
+
+ /* hardware can take 16 microframes to turn off ... */
+ if (handshake(oxu, &oxu->regs->status, STS_ASS | STS_PSS,
+ 0, 16 * 125) != 0) {
+ oxu_to_hcd(oxu)->state = HC_STATE_HALT;
+ return;
+ }
+}
+
+static int check_reset_complete(struct oxu_hcd *oxu, int index,
+ u32 __iomem *status_reg, int port_status)
+{
+ if (!(port_status & PORT_CONNECT)) {
+ oxu->reset_done[index] = 0;
+ return port_status;
+ }
+
+ /* if reset finished and it's still not enabled -- handoff */
+ if (!(port_status & PORT_PE)) {
+ oxu_dbg(oxu, "Failed to enable port %d on root hub TT\n",
+ index+1);
+ return port_status;
+ } else
+ oxu_dbg(oxu, "port %d high speed\n", index + 1);
+
+ return port_status;
+}
+
+static void ehci_hub_descriptor(struct oxu_hcd *oxu,
+ struct usb_hub_descriptor *desc)
+{
+ int ports = HCS_N_PORTS(oxu->hcs_params);
+ u16 temp;
+
+ desc->bDescriptorType = 0x29;
+ desc->bPwrOn2PwrGood = 10; /* oxu 1.0, 2.3.9 says 20ms max */
+ desc->bHubContrCurrent = 0;
+
+ desc->bNbrPorts = ports;
+ temp = 1 + (ports / 8);
+ desc->bDescLength = 7 + 2 * temp;
+
+ /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
+ memset(&desc->bitmap[0], 0, temp);
+ memset(&desc->bitmap[temp], 0xff, temp);
+
+ temp = 0x0008; /* per-port overcurrent reporting */
+ if (HCS_PPC(oxu->hcs_params))
+ temp |= 0x0001; /* per-port power control */
+ else
+ temp |= 0x0002; /* no power switching */
+ desc->wHubCharacteristics = (__force __u16)cpu_to_le16(temp);
+}
+
+
+/* Allocate an OXU210HP on-chip memory data buffer
+ *
+ * An on-chip memory data buffer is required for each OXU210HP USB transfer.
+ * Each transfer descriptor has one or more on-chip memory data buffers.
+ *
+ * Data buffers are allocated from a fix sized pool of data blocks.
+ * To minimise fragmentation and give reasonable memory utlisation,
+ * data buffers are allocated with sizes the power of 2 multiples of
+ * the block size, starting on an address a multiple of the allocated size.
+ *
+ * FIXME: callers of this function require a buffer to be allocated for
+ * len=0. This is a waste of on-chip memory and should be fix. Then this
+ * function should be changed to not allocate a buffer for len=0.
+ */
+static int oxu_buf_alloc(struct oxu_hcd *oxu, struct ehci_qtd *qtd, int len)
+{
+ int n_blocks; /* minium blocks needed to hold len */
+ int a_blocks; /* blocks allocated */
+ int i, j;
+
+ /* Don't allocte bigger than supported */
+ if (len > BUFFER_SIZE * BUFFER_NUM) {
+ oxu_err(oxu, "buffer too big (%d)\n", len);
+ return -ENOMEM;
+ }
+
+ spin_lock(&oxu->mem_lock);
+
+ /* Number of blocks needed to hold len */
+ n_blocks = (len + BUFFER_SIZE - 1) / BUFFER_SIZE;
+
+ /* Round the number of blocks up to the power of 2 */
+ for (a_blocks = 1; a_blocks < n_blocks; a_blocks <<= 1)
+ ;
+
+ /* Find a suitable available data buffer */
+ for (i = 0; i < BUFFER_NUM;
+ i += max(a_blocks, (int)oxu->db_used[i])) {
+
+ /* Check all the required blocks are available */
+ for (j = 0; j < a_blocks; j++)
+ if (oxu->db_used[i + j])
+ break;
+
+ if (j != a_blocks)
+ continue;
+
+ /* Allocate blocks found! */
+ qtd->buffer = (void *) &oxu->mem->db_pool[i];
+ qtd->buffer_dma = virt_to_phys(qtd->buffer);
+
+ qtd->qtd_buffer_len = BUFFER_SIZE * a_blocks;
+ oxu->db_used[i] = a_blocks;
+
+ spin_unlock(&oxu->mem_lock);
+
+ return 0;
+ }
+
+ /* Failed */
+
+ spin_unlock(&oxu->mem_lock);
+
+ return -ENOMEM;
+}
+
+static void oxu_buf_free(struct oxu_hcd *oxu, struct ehci_qtd *qtd)
+{
+ int index;
+
+ spin_lock(&oxu->mem_lock);
+
+ index = (qtd->buffer - (void *) &oxu->mem->db_pool[0])
+ / BUFFER_SIZE;
+ oxu->db_used[index] = 0;
+ qtd->qtd_buffer_len = 0;
+ qtd->buffer_dma = 0;
+ qtd->buffer = NULL;
+
+ spin_unlock(&oxu->mem_lock);
+
+ return;
+}
+
+static inline void ehci_qtd_init(struct ehci_qtd *qtd, dma_addr_t dma)
+{
+ memset(qtd, 0, sizeof *qtd);
+ qtd->qtd_dma = dma;
+ qtd->hw_token = cpu_to_le32(QTD_STS_HALT);
+ qtd->hw_next = EHCI_LIST_END;
+ qtd->hw_alt_next = EHCI_LIST_END;
+ INIT_LIST_HEAD(&qtd->qtd_list);
+}
+
+static inline void oxu_qtd_free(struct oxu_hcd *oxu, struct ehci_qtd *qtd)
+{
+ int index;
+
+ if (qtd->buffer)
+ oxu_buf_free(oxu, qtd);
+
+ spin_lock(&oxu->mem_lock);
+
+ index = qtd - &oxu->mem->qtd_pool[0];
+ oxu->qtd_used[index] = 0;
+
+ spin_unlock(&oxu->mem_lock);
+
+ return;
+}
+
+static struct ehci_qtd *ehci_qtd_alloc(struct oxu_hcd *oxu)
+{
+ int i;
+ struct ehci_qtd *qtd = NULL;
+
+ spin_lock(&oxu->mem_lock);
+
+ for (i = 0; i < QTD_NUM; i++)
+ if (!oxu->qtd_used[i])
+ break;
+
+ if (i < QTD_NUM) {
+ qtd = (struct ehci_qtd *) &oxu->mem->qtd_pool[i];
+ memset(qtd, 0, sizeof *qtd);
+
+ qtd->hw_token = cpu_to_le32(QTD_STS_HALT);
+ qtd->hw_next = EHCI_LIST_END;
+ qtd->hw_alt_next = EHCI_LIST_END;
+ INIT_LIST_HEAD(&qtd->qtd_list);
+
+ qtd->qtd_dma = virt_to_phys(qtd);
+
+ oxu->qtd_used[i] = 1;
+ }
+
+ spin_unlock(&oxu->mem_lock);
+
+ return qtd;
+}
+
+static void oxu_qh_free(struct oxu_hcd *oxu, struct ehci_qh *qh)
+{
+ int index;
+
+ spin_lock(&oxu->mem_lock);
+
+ index = qh - &oxu->mem->qh_pool[0];
+ oxu->qh_used[index] = 0;
+
+ spin_unlock(&oxu->mem_lock);
+
+ return;
+}
+
+static void qh_destroy(struct kref *kref)
+{
+ struct ehci_qh *qh = container_of(kref, struct ehci_qh, kref);
+ struct oxu_hcd *oxu = qh->oxu;
+
+ /* clean qtds first, and know this is not linked */
+ if (!list_empty(&qh->qtd_list) || qh->qh_next.ptr) {
+ oxu_dbg(oxu, "unused qh not empty!\n");
+ BUG();
+ }
+ if (qh->dummy)
+ oxu_qtd_free(oxu, qh->dummy);
+ oxu_qh_free(oxu, qh);
+}
+
+static struct ehci_qh *oxu_qh_alloc(struct oxu_hcd *oxu)
+{
+ int i;
+ struct ehci_qh *qh = NULL;
+
+ spin_lock(&oxu->mem_lock);
+
+ for (i = 0; i < QHEAD_NUM; i++)
+ if (!oxu->qh_used[i])
+ break;
+
+ if (i < QHEAD_NUM) {
+ qh = (struct ehci_qh *) &oxu->mem->qh_pool[i];
+ memset(qh, 0, sizeof *qh);
+
+ kref_init(&qh->kref);
+ qh->oxu = oxu;
+ qh->qh_dma = virt_to_phys(qh);
+ INIT_LIST_HEAD(&qh->qtd_list);
+
+ /* dummy td enables safe urb queuing */
+ qh->dummy = ehci_qtd_alloc(oxu);
+ if (qh->dummy == NULL) {
+ oxu_dbg(oxu, "no dummy td\n");
+ oxu->qh_used[i] = 0;
+
+ return NULL;
+ }
+
+ oxu->qh_used[i] = 1;
+ }
+
+ spin_unlock(&oxu->mem_lock);
+
+ return qh;
+}
+
+/* to share a qh (cpu threads, or hc) */
+static inline struct ehci_qh *qh_get(struct ehci_qh *qh)
+{
+ kref_get(&qh->kref);
+ return qh;
+}
+
+static inline void qh_put(struct ehci_qh *qh)
+{
+ kref_put(&qh->kref, qh_destroy);
+}
+
+static void oxu_murb_free(struct oxu_hcd *oxu, struct oxu_murb *murb)
+{
+ int index;
+
+ spin_lock(&oxu->mem_lock);
+
+ index = murb - &oxu->murb_pool[0];
+ oxu->murb_used[index] = 0;
+
+ spin_unlock(&oxu->mem_lock);
+
+ return;
+}
+
+static struct oxu_murb *oxu_murb_alloc(struct oxu_hcd *oxu)
+
+{
+ int i;
+ struct oxu_murb *murb = NULL;
+
+ spin_lock(&oxu->mem_lock);
+
+ for (i = 0; i < MURB_NUM; i++)
+ if (!oxu->murb_used[i])
+ break;
+
+ if (i < MURB_NUM) {
+ murb = &(oxu->murb_pool)[i];
+
+ oxu->murb_used[i] = 1;
+ }
+
+ spin_unlock(&oxu->mem_lock);
+
+ return murb;
+}
+
+/* The queue heads and transfer descriptors are managed from pools tied
+ * to each of the "per device" structures.
+ * This is the initialisation and cleanup code.
+ */
+static void ehci_mem_cleanup(struct oxu_hcd *oxu)
+{
+ kfree(oxu->murb_pool);
+ oxu->murb_pool = NULL;
+
+ if (oxu->async)
+ qh_put(oxu->async);
+ oxu->async = NULL;
+
+ del_timer(&oxu->urb_timer);
+
+ oxu->periodic = NULL;
+
+ /* shadow periodic table */
+ kfree(oxu->pshadow);
+ oxu->pshadow = NULL;
+}
+
+/* Remember to add cleanup code (above) if you add anything here.
+ */
+static int ehci_mem_init(struct oxu_hcd *oxu, gfp_t flags)
+{
+ int i;
+
+ for (i = 0; i < oxu->periodic_size; i++)
+ oxu->mem->frame_list[i] = EHCI_LIST_END;
+ for (i = 0; i < QHEAD_NUM; i++)
+ oxu->qh_used[i] = 0;
+ for (i = 0; i < QTD_NUM; i++)
+ oxu->qtd_used[i] = 0;
+
+ oxu->murb_pool = kcalloc(MURB_NUM, sizeof(struct oxu_murb), flags);
+ if (!oxu->murb_pool)
+ goto fail;
+
+ for (i = 0; i < MURB_NUM; i++)
+ oxu->murb_used[i] = 0;
+
+ oxu->async = oxu_qh_alloc(oxu);
+ if (!oxu->async)
+ goto fail;
+
+ oxu->periodic = (__le32 *) &oxu->mem->frame_list;
+ oxu->periodic_dma = virt_to_phys(oxu->periodic);
+
+ for (i = 0; i < oxu->periodic_size; i++)
+ oxu->periodic[i] = EHCI_LIST_END;
+
+ /* software shadow of hardware table */
+ oxu->pshadow = kcalloc(oxu->periodic_size, sizeof(void *), flags);
+ if (oxu->pshadow != NULL)
+ return 0;
+
+fail:
+ oxu_dbg(oxu, "couldn't init memory\n");
+ ehci_mem_cleanup(oxu);
+ return -ENOMEM;
+}
+
+/* Fill a qtd, returning how much of the buffer we were able to queue up.
+ */
+static int qtd_fill(struct ehci_qtd *qtd, dma_addr_t buf, size_t len,
+ int token, int maxpacket)
+{
+ int i, count;
+ u64 addr = buf;
+
+ /* one buffer entry per 4K ... first might be short or unaligned */
+ qtd->hw_buf[0] = cpu_to_le32((u32)addr);
+ qtd->hw_buf_hi[0] = cpu_to_le32((u32)(addr >> 32));
+ count = 0x1000 - (buf & 0x0fff); /* rest of that page */
+ if (likely(len < count)) /* ... iff needed */
+ count = len;
+ else {
+ buf += 0x1000;
+ buf &= ~0x0fff;
+
+ /* per-qtd limit: from 16K to 20K (best alignment) */
+ for (i = 1; count < len && i < 5; i++) {
+ addr = buf;
+ qtd->hw_buf[i] = cpu_to_le32((u32)addr);
+ qtd->hw_buf_hi[i] = cpu_to_le32((u32)(addr >> 32));
+ buf += 0x1000;
+ if ((count + 0x1000) < len)
+ count += 0x1000;
+ else
+ count = len;
+ }
+
+ /* short packets may only terminate transfers */
+ if (count != len)
+ count -= (count % maxpacket);
+ }
+ qtd->hw_token = cpu_to_le32((count << 16) | token);
+ qtd->length = count;
+
+ return count;
+}
+
+static inline void qh_update(struct oxu_hcd *oxu,
+ struct ehci_qh *qh, struct ehci_qtd *qtd)
+{
+ /* writes to an active overlay are unsafe */
+ BUG_ON(qh->qh_state != QH_STATE_IDLE);
+
+ qh->hw_qtd_next = QTD_NEXT(qtd->qtd_dma);
+ qh->hw_alt_next = EHCI_LIST_END;
+
+ /* Except for control endpoints, we make hardware maintain data
+ * toggle (like OHCI) ... here (re)initialize the toggle in the QH,
+ * and set the pseudo-toggle in udev. Only usb_clear_halt() will
+ * ever clear it.
+ */
+ if (!(qh->hw_info1 & cpu_to_le32(1 << 14))) {
+ unsigned is_out, epnum;
+
+ is_out = !(qtd->hw_token & cpu_to_le32(1 << 8));
+ epnum = (le32_to_cpup(&qh->hw_info1) >> 8) & 0x0f;
+ if (unlikely(!usb_gettoggle(qh->dev, epnum, is_out))) {
+ qh->hw_token &= ~__constant_cpu_to_le32(QTD_TOGGLE);
+ usb_settoggle(qh->dev, epnum, is_out, 1);
+ }
+ }
+
+ /* HC must see latest qtd and qh data before we clear ACTIVE+HALT */
+ wmb();
+ qh->hw_token &= __constant_cpu_to_le32(QTD_TOGGLE | QTD_STS_PING);
+}
+
+/* If it weren't for a common silicon quirk (writing the dummy into the qh
+ * overlay, so qh->hw_token wrongly becomes inactive/halted), only fault
+ * recovery (including urb dequeue) would need software changes to a QH...
+ */
+static void qh_refresh(struct oxu_hcd *oxu, struct ehci_qh *qh)
+{
+ struct ehci_qtd *qtd;
+
+ if (list_empty(&qh->qtd_list))
+ qtd = qh->dummy;
+ else {
+ qtd = list_entry(qh->qtd_list.next,
+ struct ehci_qtd, qtd_list);
+ /* first qtd may already be partially processed */
+ if (cpu_to_le32(qtd->qtd_dma) == qh->hw_current)
+ qtd = NULL;
+ }
+
+ if (qtd)
+ qh_update(oxu, qh, qtd);
+}
+
+static void qtd_copy_status(struct oxu_hcd *oxu, struct urb *urb,
+ size_t length, u32 token)
+{
+ /* count IN/OUT bytes, not SETUP (even short packets) */
+ if (likely(QTD_PID(token) != 2))
+ urb->actual_length += length - QTD_LENGTH(token);
+
+ /* don't modify error codes */
+ if (unlikely(urb->status != -EINPROGRESS))
+ return;
+
+ /* force cleanup after short read; not always an error */
+ if (unlikely(IS_SHORT_READ(token)))
+ urb->status = -EREMOTEIO;
+
+ /* serious "can't proceed" faults reported by the hardware */
+ if (token & QTD_STS_HALT) {
+ if (token & QTD_STS_BABBLE) {
+ /* FIXME "must" disable babbling device's port too */
+ urb->status = -EOVERFLOW;
+ } else if (token & QTD_STS_MMF) {
+ /* fs/ls interrupt xfer missed the complete-split */
+ urb->status = -EPROTO;
+ } else if (token & QTD_STS_DBE) {
+ urb->status = (QTD_PID(token) == 1) /* IN ? */
+ ? -ENOSR /* hc couldn't read data */
+ : -ECOMM; /* hc couldn't write data */
+ } else if (token & QTD_STS_XACT) {
+ /* timeout, bad crc, wrong PID, etc; retried */
+ if (QTD_CERR(token))
+ urb->status = -EPIPE;
+ else {
+ oxu_dbg(oxu, "devpath %s ep%d%s 3strikes\n",
+ urb->dev->devpath,
+ usb_pipeendpoint(urb->pipe),
+ usb_pipein(urb->pipe) ? "in" : "out");
+ urb->status = -EPROTO;
+ }
+ /* CERR nonzero + no errors + halt --> stall */
+ } else if (QTD_CERR(token))
+ urb->status = -EPIPE;
+ else /* unknown */
+ urb->status = -EPROTO;
+
+ oxu_vdbg(oxu, "dev%d ep%d%s qtd token %08x --> status %d\n",
+ usb_pipedevice(urb->pipe),
+ usb_pipeendpoint(urb->pipe),
+ usb_pipein(urb->pipe) ? "in" : "out",
+ token, urb->status);
+ }
+}
+
+static void ehci_urb_done(struct oxu_hcd *oxu, struct urb *urb)
+__releases(oxu->lock)
+__acquires(oxu->lock)
+{
+ if (likely(urb->hcpriv != NULL)) {
+ struct ehci_qh *qh = (struct ehci_qh *) urb->hcpriv;
+
+ /* S-mask in a QH means it's an interrupt urb */
+ if ((qh->hw_info2 & __constant_cpu_to_le32(QH_SMASK)) != 0) {
+
+ /* ... update hc-wide periodic stats (for usbfs) */
+ oxu_to_hcd(oxu)->self.bandwidth_int_reqs--;
+ }
+ qh_put(qh);
+ }
+
+ urb->hcpriv = NULL;
+ switch (urb->status) {
+ case -EINPROGRESS: /* success */
+ urb->status = 0;
+ default: /* fault */
+ break;
+ case -EREMOTEIO: /* fault or normal */
+ if (!(urb->transfer_flags & URB_SHORT_NOT_OK))
+ urb->status = 0;
+ break;
+ case -ECONNRESET: /* canceled */
+ case -ENOENT:
+ break;
+ }
+
+#ifdef OXU_URB_TRACE
+ oxu_dbg(oxu, "%s %s urb %p ep%d%s status %d len %d/%d\n",
+ __func__, urb->dev->devpath, urb,
+ usb_pipeendpoint(urb->pipe),
+ usb_pipein(urb->pipe) ? "in" : "out",
+ urb->status,
+ urb->actual_length, urb->transfer_buffer_length);
+#endif
+
+ /* complete() can reenter this HCD */
+ spin_unlock(&oxu->lock);
+ usb_hcd_giveback_urb(oxu_to_hcd(oxu), urb, urb->status);
+ spin_lock(&oxu->lock);
+}
+
+static void start_unlink_async(struct oxu_hcd *oxu, struct ehci_qh *qh);
+static void unlink_async(struct oxu_hcd *oxu, struct ehci_qh *qh);
+
+static void intr_deschedule(struct oxu_hcd *oxu, struct ehci_qh *qh);
+static int qh_schedule(struct oxu_hcd *oxu, struct ehci_qh *qh);
+
+#define HALT_BIT __constant_cpu_to_le32(QTD_STS_HALT)
+
+/* Process and free completed qtds for a qh, returning URBs to drivers.
+ * Chases up to qh->hw_current. Returns number of completions called,
+ * indicating how much "real" work we did.
+ */
+static unsigned qh_completions(struct oxu_hcd *oxu, struct ehci_qh *qh)
+{
+ struct ehci_qtd *last = NULL, *end = qh->dummy;
+ struct list_head *entry, *tmp;
+ int stopped;
+ unsigned count = 0;
+ int do_status = 0;
+ u8 state;
+ struct oxu_murb *murb = NULL;
+
+ if (unlikely(list_empty(&qh->qtd_list)))
+ return count;
+
+ /* completions (or tasks on other cpus) must never clobber HALT
+ * till we've gone through and cleaned everything up, even when
+ * they add urbs to this qh's queue or mark them for unlinking.
+ *
+ * NOTE: unlinking expects to be done in queue order.
+ */
+ state = qh->qh_state;
+ qh->qh_state = QH_STATE_COMPLETING;
+ stopped = (state == QH_STATE_IDLE);
+
+ /* remove de-activated QTDs from front of queue.
+ * after faults (including short reads), cleanup this urb
+ * then let the queue advance.
+ * if queue is stopped, handles unlinks.
+ */
+ list_for_each_safe(entry, tmp, &qh->qtd_list) {
+ struct ehci_qtd *qtd;
+ struct urb *urb;
+ u32 token = 0;
+
+ qtd = list_entry(entry, struct ehci_qtd, qtd_list);
+ urb = qtd->urb;
+
+ /* Clean up any state from previous QTD ...*/
+ if (last) {
+ if (likely(last->urb != urb)) {
+ if (last->urb->complete == NULL) {
+ murb = (struct oxu_murb *) last->urb;
+ last->urb = murb->main;
+ if (murb->last) {
+ ehci_urb_done(oxu, last->urb);
+ count++;
+ }
+ oxu_murb_free(oxu, murb);
+ } else {
+ ehci_urb_done(oxu, last->urb);
+ count++;
+ }
+ }
+ oxu_qtd_free(oxu, last);
+ last = NULL;
+ }
+
+ /* ignore urbs submitted during completions we reported */
+ if (qtd == end)
+ break;
+
+ /* hardware copies qtd out of qh overlay */
+ rmb();
+ token = le32_to_cpu(qtd->hw_token);
+
+ /* always clean up qtds the hc de-activated */
+ if ((token & QTD_STS_ACTIVE) == 0) {
+
+ if ((token & QTD_STS_HALT) != 0) {
+ stopped = 1;
+
+ /* magic dummy for some short reads; qh won't advance.
+ * that silicon quirk can kick in with this dummy too.
+ */
+ } else if (IS_SHORT_READ(token) &&
+ !(qtd->hw_alt_next & EHCI_LIST_END)) {
+ stopped = 1;
+ goto halt;
+ }
+
+ /* stop scanning when we reach qtds the hc is using */
+ } else if (likely(!stopped &&
+ HC_IS_RUNNING(oxu_to_hcd(oxu)->state))) {
+ break;
+
+ } else {
+ stopped = 1;
+
+ if (unlikely(!HC_IS_RUNNING(oxu_to_hcd(oxu)->state)))
+ urb->status = -ESHUTDOWN;
+
+ /* ignore active urbs unless some previous qtd
+ * for the urb faulted (including short read) or
+ * its urb was canceled. we may patch qh or qtds.
+ */
+ if (likely(urb->status == -EINPROGRESS))
+ continue;
+
+ /* issue status after short control reads */
+ if (unlikely(do_status != 0)
+ && QTD_PID(token) == 0 /* OUT */) {
+ do_status = 0;
+ continue;
+ }
+
+ /* token in overlay may be most current */
+ if (state == QH_STATE_IDLE
+ && cpu_to_le32(qtd->qtd_dma)
+ == qh->hw_current)
+ token = le32_to_cpu(qh->hw_token);
+
+ /* force halt for unlinked or blocked qh, so we'll
+ * patch the qh later and so that completions can't
+ * activate it while we "know" it's stopped.
+ */
+ if ((HALT_BIT & qh->hw_token) == 0) {
+halt:
+ qh->hw_token |= HALT_BIT;
+ wmb();
+ }
+ }
+
+ /* Remove it from the queue */
+ qtd_copy_status(oxu, urb->complete ?
+ urb : ((struct oxu_murb *) urb)->main,
+ qtd->length, token);
+ if ((usb_pipein(qtd->urb->pipe)) &&
+ (NULL != qtd->transfer_buffer))
+ memcpy(qtd->transfer_buffer, qtd->buffer, qtd->length);
+ do_status = (urb->status == -EREMOTEIO)
+ && usb_pipecontrol(urb->pipe);
+
+ if (stopped && qtd->qtd_list.prev != &qh->qtd_list) {
+ last = list_entry(qtd->qtd_list.prev,
+ struct ehci_qtd, qtd_list);
+ last->hw_next = qtd->hw_next;
+ }
+ list_del(&qtd->qtd_list);
+ last = qtd;
+ }
+
+ /* last urb's completion might still need calling */
+ if (likely(last != NULL)) {
+ if (last->urb->complete == NULL) {
+ murb = (struct oxu_murb *) last->urb;
+ last->urb = murb->main;
+ if (murb->last) {
+ ehci_urb_done(oxu, last->urb);
+ count++;
+ }
+ oxu_murb_free(oxu, murb);
+ } else {
+ ehci_urb_done(oxu, last->urb);
+ count++;
+ }
+ oxu_qtd_free(oxu, last);
+ }
+
+ /* restore original state; caller must unlink or relink */
+ qh->qh_state = state;
+
+ /* be sure the hardware's done with the qh before refreshing
+ * it after fault cleanup, or recovering from silicon wrongly
+ * overlaying the dummy qtd (which reduces DMA chatter).
+ */
+ if (stopped != 0 || qh->hw_qtd_next == EHCI_LIST_END) {
+ switch (state) {
+ case QH_STATE_IDLE:
+ qh_refresh(oxu, qh);
+ break;
+ case QH_STATE_LINKED:
+ /* should be rare for periodic transfers,
+ * except maybe high bandwidth ...
+ */
+ if ((__constant_cpu_to_le32(QH_SMASK)
+ & qh->hw_info2) != 0) {
+ intr_deschedule(oxu, qh);
+ (void) qh_schedule(oxu, qh);
+ } else
+ unlink_async(oxu, qh);
+ break;
+ /* otherwise, unlink already started */
+ }
+ }
+
+ return count;
+}
+
+/* High bandwidth multiplier, as encoded in highspeed endpoint descriptors */
+#define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03))
+/* ... and packet size, for any kind of endpoint descriptor */
+#define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff)
+
+/* Reverse of qh_urb_transaction: free a list of TDs.
+ * used for cleanup after errors, before HC sees an URB's TDs.
+ */
+static void qtd_list_free(struct oxu_hcd *oxu,
+ struct urb *urb, struct list_head *qtd_list)
+{
+ struct list_head *entry, *temp;
+
+ list_for_each_safe(entry, temp, qtd_list) {
+ struct ehci_qtd *qtd;
+
+ qtd = list_entry(entry, struct ehci_qtd, qtd_list);
+ list_del(&qtd->qtd_list);
+ oxu_qtd_free(oxu, qtd);
+ }
+}
+
+/* Create a list of filled qtds for this URB; won't link into qh.
+ */
+static struct list_head *qh_urb_transaction(struct oxu_hcd *oxu,
+ struct urb *urb,
+ struct list_head *head,
+ gfp_t flags)
+{
+ struct ehci_qtd *qtd, *qtd_prev;
+ dma_addr_t buf;
+ int len, maxpacket;
+ int is_input;
+ u32 token;
+ void *transfer_buf = NULL;
+ int ret;
+
+ /*
+ * URBs map to sequences of QTDs: one logical transaction
+ */
+ qtd = ehci_qtd_alloc(oxu);
+ if (unlikely(!qtd))
+ return NULL;
+ list_add_tail(&qtd->qtd_list, head);
+ qtd->urb = urb;
+
+ token = QTD_STS_ACTIVE;
+ token |= (EHCI_TUNE_CERR << 10);
+ /* for split transactions, SplitXState initialized to zero */
+
+ len = urb->transfer_buffer_length;
+ is_input = usb_pipein(urb->pipe);
+ if (!urb->transfer_buffer && urb->transfer_buffer_length && is_input)
+ urb->transfer_buffer = phys_to_virt(urb->transfer_dma);
+
+ if (usb_pipecontrol(urb->pipe)) {
+ /* SETUP pid */
+ ret = oxu_buf_alloc(oxu, qtd, sizeof(struct usb_ctrlrequest));
+ if (ret)
+ goto cleanup;
+
+ qtd_fill(qtd, qtd->buffer_dma, sizeof(struct usb_ctrlrequest),
+ token | (2 /* "setup" */ << 8), 8);
+ memcpy(qtd->buffer, qtd->urb->setup_packet,
+ sizeof(struct usb_ctrlrequest));
+
+ /* ... and always at least one more pid */
+ token ^= QTD_TOGGLE;
+ qtd_prev = qtd;
+ qtd = ehci_qtd_alloc(oxu);
+ if (unlikely(!qtd))
+ goto cleanup;
+ qtd->urb = urb;
+ qtd_prev->hw_next = QTD_NEXT(qtd->qtd_dma);
+ list_add_tail(&qtd->qtd_list, head);
+
+ /* for zero length DATA stages, STATUS is always IN */
+ if (len == 0)
+ token |= (1 /* "in" */ << 8);
+ }
+
+ /*
+ * Data transfer stage: buffer setup
+ */
+
+ ret = oxu_buf_alloc(oxu, qtd, len);
+ if (ret)
+ goto cleanup;
+
+ buf = qtd->buffer_dma;
+ transfer_buf = urb->transfer_buffer;
+
+ if (!is_input)
+ memcpy(qtd->buffer, qtd->urb->transfer_buffer, len);
+
+ if (is_input)
+ token |= (1 /* "in" */ << 8);
+ /* else it's already initted to "out" pid (0 << 8) */
+
+ maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input));
+
+ /*
+ * buffer gets wrapped in one or more qtds;
+ * last one may be "short" (including zero len)
+ * and may serve as a control status ack
+ */
+ for (;;) {
+ int this_qtd_len;
+
+ this_qtd_len = qtd_fill(qtd, buf, len, token, maxpacket);
+ qtd->transfer_buffer = transfer_buf;
+ len -= this_qtd_len;
+ buf += this_qtd_len;
+ transfer_buf += this_qtd_len;
+ if (is_input)
+ qtd->hw_alt_next = oxu->async->hw_alt_next;
+
+ /* qh makes control packets use qtd toggle; maybe switch it */
+ if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0)
+ token ^= QTD_TOGGLE;
+
+ if (likely(len <= 0))
+ break;
+
+ qtd_prev = qtd;
+ qtd = ehci_qtd_alloc(oxu);
+ if (unlikely(!qtd))
+ goto cleanup;
+ if (likely(len > 0)) {
+ ret = oxu_buf_alloc(oxu, qtd, len);
+ if (ret)
+ goto cleanup;
+ }
+ qtd->urb = urb;
+ qtd_prev->hw_next = QTD_NEXT(qtd->qtd_dma);
+ list_add_tail(&qtd->qtd_list, head);
+ }
+
+ /* unless the bulk/interrupt caller wants a chance to clean
+ * up after short reads, hc should advance qh past this urb
+ */
+ if (likely((urb->transfer_flags & URB_SHORT_NOT_OK) == 0
+ || usb_pipecontrol(urb->pipe)))
+ qtd->hw_alt_next = EHCI_LIST_END;
+
+ /*
+ * control requests may need a terminating data "status" ack;
+ * bulk ones may need a terminating short packet (zero length).
+ */
+ if (likely(urb->transfer_buffer_length != 0)) {
+ int one_more = 0;
+
+ if (usb_pipecontrol(urb->pipe)) {
+ one_more = 1;
+ token ^= 0x0100; /* "in" <--> "out" */
+ token |= QTD_TOGGLE; /* force DATA1 */
+ } else if (usb_pipebulk(urb->pipe)
+ && (urb->transfer_flags & URB_ZERO_PACKET)
+ && !(urb->transfer_buffer_length % maxpacket)) {
+ one_more = 1;
+ }
+ if (one_more) {
+ qtd_prev = qtd;
+ qtd = ehci_qtd_alloc(oxu);
+ if (unlikely(!qtd))
+ goto cleanup;
+ qtd->urb = urb;
+ qtd_prev->hw_next = QTD_NEXT(qtd->qtd_dma);
+ list_add_tail(&qtd->qtd_list, head);
+
+ /* never any data in such packets */
+ qtd_fill(qtd, 0, 0, token, 0);
+ }
+ }
+
+ /* by default, enable interrupt on urb completion */
+ qtd->hw_token |= __constant_cpu_to_le32(QTD_IOC);
+ return head;
+
+cleanup:
+ qtd_list_free(oxu, urb, head);
+ return NULL;
+}
+
+/* Each QH holds a qtd list; a QH is used for everything except iso.
+ *
+ * For interrupt urbs, the scheduler must set the microframe scheduling
+ * mask(s) each time the QH gets scheduled. For highspeed, that's
+ * just one microframe in the s-mask. For split interrupt transactions
+ * there are additional complications: c-mask, maybe FSTNs.
+ */
+static struct ehci_qh *qh_make(struct oxu_hcd *oxu,
+ struct urb *urb, gfp_t flags)
+{
+ struct ehci_qh *qh = oxu_qh_alloc(oxu);
+ u32 info1 = 0, info2 = 0;
+ int is_input, type;
+ int maxp = 0;
+
+ if (!qh)
+ return qh;
+
+ /*
+ * init endpoint/device data for this QH
+ */
+ info1 |= usb_pipeendpoint(urb->pipe) << 8;
+ info1 |= usb_pipedevice(urb->pipe) << 0;
+
+ is_input = usb_pipein(urb->pipe);
+ type = usb_pipetype(urb->pipe);
+ maxp = usb_maxpacket(urb->dev, urb->pipe, !is_input);
+
+ /* Compute interrupt scheduling parameters just once, and save.
+ * - allowing for high bandwidth, how many nsec/uframe are used?
+ * - split transactions need a second CSPLIT uframe; same question
+ * - splits also need a schedule gap (for full/low speed I/O)
+ * - qh has a polling interval
+ *
+ * For control/bulk requests, the HC or TT handles these.
+ */
+ if (type == PIPE_INTERRUPT) {
+ qh->usecs = NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH,
+ is_input, 0,
+ hb_mult(maxp) * max_packet(maxp)));
+ qh->start = NO_FRAME;
+
+ if (urb->dev->speed == USB_SPEED_HIGH) {
+ qh->c_usecs = 0;
+ qh->gap_uf = 0;
+
+ qh->period = urb->interval >> 3;
+ if (qh->period == 0 && urb->interval != 1) {
+ /* NOTE interval 2 or 4 uframes could work.
+ * But interval 1 scheduling is simpler, and
+ * includes high bandwidth.
+ */
+ dbg("intr period %d uframes, NYET!",
+ urb->interval);
+ goto done;
+ }
+ } else {
+ struct usb_tt *tt = urb->dev->tt;
+ int think_time;
+
+ /* gap is f(FS/LS transfer times) */
+ qh->gap_uf = 1 + usb_calc_bus_time(urb->dev->speed,
+ is_input, 0, maxp) / (125 * 1000);
+
+ /* FIXME this just approximates SPLIT/CSPLIT times */
+ if (is_input) { /* SPLIT, gap, CSPLIT+DATA */
+ qh->c_usecs = qh->usecs + HS_USECS(0);
+ qh->usecs = HS_USECS(1);
+ } else { /* SPLIT+DATA, gap, CSPLIT */
+ qh->usecs += HS_USECS(1);
+ qh->c_usecs = HS_USECS(0);
+ }
+
+ think_time = tt ? tt->think_time : 0;
+ qh->tt_usecs = NS_TO_US(think_time +
+ usb_calc_bus_time(urb->dev->speed,
+ is_input, 0, max_packet(maxp)));
+ qh->period = urb->interval;
+ }
+ }
+
+ /* support for tt scheduling, and access to toggles */
+ qh->dev = urb->dev;
+
+ /* using TT? */
+ switch (urb->dev->speed) {
+ case USB_SPEED_LOW:
+ info1 |= (1 << 12); /* EPS "low" */
+ /* FALL THROUGH */
+
+ case USB_SPEED_FULL:
+ /* EPS 0 means "full" */
+ if (type != PIPE_INTERRUPT)
+ info1 |= (EHCI_TUNE_RL_TT << 28);
+ if (type == PIPE_CONTROL) {
+ info1 |= (1 << 27); /* for TT */
+ info1 |= 1 << 14; /* toggle from qtd */
+ }
+ info1 |= maxp << 16;
+
+ info2 |= (EHCI_TUNE_MULT_TT << 30);
+ info2 |= urb->dev->ttport << 23;
+
+ /* NOTE: if (PIPE_INTERRUPT) { scheduler sets c-mask } */
+
+ break;
+
+ case USB_SPEED_HIGH: /* no TT involved */
+ info1 |= (2 << 12); /* EPS "high" */
+ if (type == PIPE_CONTROL) {
+ info1 |= (EHCI_TUNE_RL_HS << 28);
+ info1 |= 64 << 16; /* usb2 fixed maxpacket */
+ info1 |= 1 << 14; /* toggle from qtd */
+ info2 |= (EHCI_TUNE_MULT_HS << 30);
+ } else if (type == PIPE_BULK) {
+ info1 |= (EHCI_TUNE_RL_HS << 28);
+ info1 |= 512 << 16; /* usb2 fixed maxpacket */
+ info2 |= (EHCI_TUNE_MULT_HS << 30);
+ } else { /* PIPE_INTERRUPT */
+ info1 |= max_packet(maxp) << 16;
+ info2 |= hb_mult(maxp) << 30;
+ }
+ break;
+ default:
+ dbg("bogus dev %p speed %d", urb->dev, urb->dev->speed);
+done:
+ qh_put(qh);
+ return NULL;
+ }
+
+ /* NOTE: if (PIPE_INTERRUPT) { scheduler sets s-mask } */
+
+ /* init as live, toggle clear, advance to dummy */
+ qh->qh_state = QH_STATE_IDLE;
+ qh->hw_info1 = cpu_to_le32(info1);
+ qh->hw_info2 = cpu_to_le32(info2);
+ usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), !is_input, 1);
+ qh_refresh(oxu, qh);
+ return qh;
+}
+
+/* Move qh (and its qtds) onto async queue; maybe enable queue.
+ */
+static void qh_link_async(struct oxu_hcd *oxu, struct ehci_qh *qh)
+{
+ __le32 dma = QH_NEXT(qh->qh_dma);
+ struct ehci_qh *head;
+
+ /* (re)start the async schedule? */
+ head = oxu->async;
+ timer_action_done(oxu, TIMER_ASYNC_OFF);
+ if (!head->qh_next.qh) {
+ u32 cmd = readl(&oxu->regs->command);
+
+ if (!(cmd & CMD_ASE)) {
+ /* in case a clear of CMD_ASE didn't take yet */
+ (void)handshake(oxu, &oxu->regs->status,
+ STS_ASS, 0, 150);
+ cmd |= CMD_ASE | CMD_RUN;
+ writel(cmd, &oxu->regs->command);
+ oxu_to_hcd(oxu)->state = HC_STATE_RUNNING;
+ /* posted write need not be known to HC yet ... */
+ }
+ }
+
+ /* clear halt and/or toggle; and maybe recover from silicon quirk */
+ if (qh->qh_state == QH_STATE_IDLE)
+ qh_refresh(oxu, qh);
+
+ /* splice right after start */
+ qh->qh_next = head->qh_next;
+ qh->hw_next = head->hw_next;
+ wmb();
+
+ head->qh_next.qh = qh;
+ head->hw_next = dma;
+
+ qh->qh_state = QH_STATE_LINKED;
+ /* qtd completions reported later by interrupt */
+}
+
+#define QH_ADDR_MASK __constant_cpu_to_le32(0x7f)
+
+/*
+ * For control/bulk/interrupt, return QH with these TDs appended.
+ * Allocates and initializes the QH if necessary.
+ * Returns null if it can't allocate a QH it needs to.
+ * If the QH has TDs (urbs) already, that's great.
+ */
+static struct ehci_qh *qh_append_tds(struct oxu_hcd *oxu,
+ struct urb *urb, struct list_head *qtd_list,
+ int epnum, void **ptr)
+{
+ struct ehci_qh *qh = NULL;
+
+ qh = (struct ehci_qh *) *ptr;
+ if (unlikely(qh == NULL)) {
+ /* can't sleep here, we have oxu->lock... */
+ qh = qh_make(oxu, urb, GFP_ATOMIC);
+ *ptr = qh;
+ }
+ if (likely(qh != NULL)) {
+ struct ehci_qtd *qtd;
+
+ if (unlikely(list_empty(qtd_list)))
+ qtd = NULL;
+ else
+ qtd = list_entry(qtd_list->next, struct ehci_qtd,
+ qtd_list);
+
+ /* control qh may need patching ... */
+ if (unlikely(epnum == 0)) {
+
+ /* usb_reset_device() briefly reverts to address 0 */
+ if (usb_pipedevice(urb->pipe) == 0)
+ qh->hw_info1 &= ~QH_ADDR_MASK;
+ }
+
+ /* just one way to queue requests: swap with the dummy qtd.
+ * only hc or qh_refresh() ever modify the overlay.
+ */
+ if (likely(qtd != NULL)) {
+ struct ehci_qtd *dummy;
+ dma_addr_t dma;
+ __le32 token;
+
+ /* to avoid racing the HC, use the dummy td instead of
+ * the first td of our list (becomes new dummy). both
+ * tds stay deactivated until we're done, when the
+ * HC is allowed to fetch the old dummy (4.10.2).
+ */
+ token = qtd->hw_token;
+ qtd->hw_token = HALT_BIT;
+ wmb();
+ dummy = qh->dummy;
+
+ dma = dummy->qtd_dma;
+ *dummy = *qtd;
+ dummy->qtd_dma = dma;
+
+ list_del(&qtd->qtd_list);
+ list_add(&dummy->qtd_list, qtd_list);
+ list_splice(qtd_list, qh->qtd_list.prev);
+
+ ehci_qtd_init(qtd, qtd->qtd_dma);
+ qh->dummy = qtd;
+
+ /* hc must see the new dummy at list end */
+ dma = qtd->qtd_dma;
+ qtd = list_entry(qh->qtd_list.prev,
+ struct ehci_qtd, qtd_list);
+ qtd->hw_next = QTD_NEXT(dma);
+
+ /* let the hc process these next qtds */
+ dummy->hw_token = (token & ~(0x80));
+ wmb();
+ dummy->hw_token = token;
+
+ urb->hcpriv = qh_get(qh);
+ }
+ }
+ return qh;
+}
+
+static int submit_async(struct oxu_hcd *oxu, struct urb *urb,
+ struct list_head *qtd_list, gfp_t mem_flags)
+{
+ struct ehci_qtd *qtd;
+ int epnum;
+ unsigned long flags;
+ struct ehci_qh *qh = NULL;
+ int rc = 0;
+
+ qtd = list_entry(qtd_list->next, struct ehci_qtd, qtd_list);
+ epnum = urb->ep->desc.bEndpointAddress;
+
+#ifdef OXU_URB_TRACE
+ oxu_dbg(oxu, "%s %s urb %p ep%d%s len %d, qtd %p [qh %p]\n",
+ __func__, urb->dev->devpath, urb,
+ epnum & 0x0f, (epnum & USB_DIR_IN) ? "in" : "out",
+ urb->transfer_buffer_length,
+ qtd, urb->ep->hcpriv);
+#endif
+
+ spin_lock_irqsave(&oxu->lock, flags);
+ if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE,
+ &oxu_to_hcd(oxu)->flags))) {
+ rc = -ESHUTDOWN;
+ goto done;
+ }
+
+ qh = qh_append_tds(oxu, urb, qtd_list, epnum, &urb->ep->hcpriv);
+ if (unlikely(qh == NULL)) {
+ rc = -ENOMEM;
+ goto done;
+ }
+
+ /* Control/bulk operations through TTs don't need scheduling,
+ * the HC and TT handle it when the TT has a buffer ready.
+ */
+ if (likely(qh->qh_state == QH_STATE_IDLE))
+ qh_link_async(oxu, qh_get(qh));
+done:
+ spin_unlock_irqrestore(&oxu->lock, flags);
+ if (unlikely(qh == NULL))
+ qtd_list_free(oxu, urb, qtd_list);
+ return rc;
+}
+
+/* The async qh for the qtds being reclaimed are now unlinked from the HC */
+
+static void end_unlink_async(struct oxu_hcd *oxu)
+{
+ struct ehci_qh *qh = oxu->reclaim;
+ struct ehci_qh *next;
+
+ timer_action_done(oxu, TIMER_IAA_WATCHDOG);
+
+ qh->qh_state = QH_STATE_IDLE;
+ qh->qh_next.qh = NULL;
+ qh_put(qh); /* refcount from reclaim */
+
+ /* other unlink(s) may be pending (in QH_STATE_UNLINK_WAIT) */
+ next = qh->reclaim;
+ oxu->reclaim = next;
+ oxu->reclaim_ready = 0;
+ qh->reclaim = NULL;
+
+ qh_completions(oxu, qh);
+
+ if (!list_empty(&qh->qtd_list)
+ && HC_IS_RUNNING(oxu_to_hcd(oxu)->state))
+ qh_link_async(oxu, qh);
+ else {
+ qh_put(qh); /* refcount from async list */
+
+ /* it's not free to turn the async schedule on/off; leave it
+ * active but idle for a while once it empties.
+ */
+ if (HC_IS_RUNNING(oxu_to_hcd(oxu)->state)
+ && oxu->async->qh_next.qh == NULL)
+ timer_action(oxu, TIMER_ASYNC_OFF);
+ }
+
+ if (next) {
+ oxu->reclaim = NULL;
+ start_unlink_async(oxu, next);
+ }
+}
+
+/* makes sure the async qh will become idle */
+/* caller must own oxu->lock */
+
+static void start_unlink_async(struct oxu_hcd *oxu, struct ehci_qh *qh)
+{
+ int cmd = readl(&oxu->regs->command);
+ struct ehci_qh *prev;
+
+#ifdef DEBUG
+ assert_spin_locked(&oxu->lock);
+ if (oxu->reclaim || (qh->qh_state != QH_STATE_LINKED
+ && qh->qh_state != QH_STATE_UNLINK_WAIT))
+ BUG();
+#endif
+
+ /* stop async schedule right now? */
+ if (unlikely(qh == oxu->async)) {
+ /* can't get here without STS_ASS set */
+ if (oxu_to_hcd(oxu)->state != HC_STATE_HALT
+ && !oxu->reclaim) {
+ /* ... and CMD_IAAD clear */
+ writel(cmd & ~CMD_ASE, &oxu->regs->command);
+ wmb();
+ /* handshake later, if we need to */
+ timer_action_done(oxu, TIMER_ASYNC_OFF);
+ }
+ return;
+ }
+
+ qh->qh_state = QH_STATE_UNLINK;
+ oxu->reclaim = qh = qh_get(qh);
+
+ prev = oxu->async;
+ while (prev->qh_next.qh != qh)
+ prev = prev->qh_next.qh;
+
+ prev->hw_next = qh->hw_next;
+ prev->qh_next = qh->qh_next;
+ wmb();
+
+ if (unlikely(oxu_to_hcd(oxu)->state == HC_STATE_HALT)) {
+ /* if (unlikely(qh->reclaim != 0))
+ * this will recurse, probably not much
+ */
+ end_unlink_async(oxu);
+ return;
+ }
+
+ oxu->reclaim_ready = 0;
+ cmd |= CMD_IAAD;
+ writel(cmd, &oxu->regs->command);
+ (void) readl(&oxu->regs->command);
+ timer_action(oxu, TIMER_IAA_WATCHDOG);
+}
+
+static void scan_async(struct oxu_hcd *oxu)
+{
+ struct ehci_qh *qh;
+ enum ehci_timer_action action = TIMER_IO_WATCHDOG;
+
+ if (!++(oxu->stamp))
+ oxu->stamp++;
+ timer_action_done(oxu, TIMER_ASYNC_SHRINK);
+rescan:
+ qh = oxu->async->qh_next.qh;
+ if (likely(qh != NULL)) {
+ do {
+ /* clean any finished work for this qh */
+ if (!list_empty(&qh->qtd_list)
+ && qh->stamp != oxu->stamp) {
+ int temp;
+
+ /* unlinks could happen here; completion
+ * reporting drops the lock. rescan using
+ * the latest schedule, but don't rescan
+ * qhs we already finished (no looping).
+ */
+ qh = qh_get(qh);
+ qh->stamp = oxu->stamp;
+ temp = qh_completions(oxu, qh);
+ qh_put(qh);
+ if (temp != 0)
+ goto rescan;
+ }
+
+ /* unlink idle entries, reducing HC PCI usage as well
+ * as HCD schedule-scanning costs. delay for any qh
+ * we just scanned, there's a not-unusual case that it
+ * doesn't stay idle for long.
+ * (plus, avoids some kind of re-activation race.)
+ */
+ if (list_empty(&qh->qtd_list)) {
+ if (qh->stamp == oxu->stamp)
+ action = TIMER_ASYNC_SHRINK;
+ else if (!oxu->reclaim
+ && qh->qh_state == QH_STATE_LINKED)
+ start_unlink_async(oxu, qh);
+ }
+
+ qh = qh->qh_next.qh;
+ } while (qh);
+ }
+ if (action == TIMER_ASYNC_SHRINK)
+ timer_action(oxu, TIMER_ASYNC_SHRINK);
+}
+
+/*
+ * periodic_next_shadow - return "next" pointer on shadow list
+ * @periodic: host pointer to qh/itd/sitd
+ * @tag: hardware tag for type of this record
+ */
+static union ehci_shadow *periodic_next_shadow(union ehci_shadow *periodic,
+ __le32 tag)
+{
+ switch (tag) {
+ default:
+ case Q_TYPE_QH:
+ return &periodic->qh->qh_next;
+ }
+}
+
+/* caller must hold oxu->lock */
+static void periodic_unlink(struct oxu_hcd *oxu, unsigned frame, void *ptr)
+{
+ union ehci_shadow *prev_p = &oxu->pshadow[frame];
+ __le32 *hw_p = &oxu->periodic[frame];
+ union ehci_shadow here = *prev_p;
+
+ /* find predecessor of "ptr"; hw and shadow lists are in sync */
+ while (here.ptr && here.ptr != ptr) {
+ prev_p = periodic_next_shadow(prev_p, Q_NEXT_TYPE(*hw_p));
+ hw_p = here.hw_next;
+ here = *prev_p;
+ }
+ /* an interrupt entry (at list end) could have been shared */
+ if (!here.ptr)
+ return;
+
+ /* update shadow and hardware lists ... the old "next" pointers
+ * from ptr may still be in use, the caller updates them.
+ */
+ *prev_p = *periodic_next_shadow(&here, Q_NEXT_TYPE(*hw_p));
+ *hw_p = *here.hw_next;
+}
+
+/* how many of the uframe's 125 usecs are allocated? */
+static unsigned short periodic_usecs(struct oxu_hcd *oxu,
+ unsigned frame, unsigned uframe)
+{
+ __le32 *hw_p = &oxu->periodic[frame];
+ union ehci_shadow *q = &oxu->pshadow[frame];
+ unsigned usecs = 0;
+
+ while (q->ptr) {
+ switch (Q_NEXT_TYPE(*hw_p)) {
+ case Q_TYPE_QH:
+ default:
+ /* is it in the S-mask? */
+ if (q->qh->hw_info2 & cpu_to_le32(1 << uframe))
+ usecs += q->qh->usecs;
+ /* ... or C-mask? */
+ if (q->qh->hw_info2 & cpu_to_le32(1 << (8 + uframe)))
+ usecs += q->qh->c_usecs;
+ hw_p = &q->qh->hw_next;
+ q = &q->qh->qh_next;
+ break;
+ }
+ }
+#ifdef DEBUG
+ if (usecs > 100)
+ oxu_err(oxu, "uframe %d sched overrun: %d usecs\n",
+ frame * 8 + uframe, usecs);
+#endif
+ return usecs;
+}
+
+static int enable_periodic(struct oxu_hcd *oxu)
+{
+ u32 cmd;
+ int status;
+
+ /* did clearing PSE did take effect yet?
+ * takes effect only at frame boundaries...
+ */
+ status = handshake(oxu, &oxu->regs->status, STS_PSS, 0, 9 * 125);
+ if (status != 0) {
+ oxu_to_hcd(oxu)->state = HC_STATE_HALT;
+ return status;
+ }
+
+ cmd = readl(&oxu->regs->command) | CMD_PSE;
+ writel(cmd, &oxu->regs->command);
+ /* posted write ... PSS happens later */
+ oxu_to_hcd(oxu)->state = HC_STATE_RUNNING;
+
+ /* make sure ehci_work scans these */
+ oxu->next_uframe = readl(&oxu->regs->frame_index)
+ % (oxu->periodic_size << 3);
+ return 0;
+}
+
+static int disable_periodic(struct oxu_hcd *oxu)
+{
+ u32 cmd;
+ int status;
+
+ /* did setting PSE not take effect yet?
+ * takes effect only at frame boundaries...
+ */
+ status = handshake(oxu, &oxu->regs->status, STS_PSS, STS_PSS, 9 * 125);
+ if (status != 0) {
+ oxu_to_hcd(oxu)->state = HC_STATE_HALT;
+ return status;
+ }
+
+ cmd = readl(&oxu->regs->command) & ~CMD_PSE;
+ writel(cmd, &oxu->regs->command);
+ /* posted write ... */
+
+ oxu->next_uframe = -1;
+ return 0;
+}
+
+/* periodic schedule slots have iso tds (normal or split) first, then a
+ * sparse tree for active interrupt transfers.
+ *
+ * this just links in a qh; caller guarantees uframe masks are set right.
+ * no FSTN support (yet; oxu 0.96+)
+ */
+static int qh_link_periodic(struct oxu_hcd *oxu, struct ehci_qh *qh)
+{
+ unsigned i;
+ unsigned period = qh->period;
+
+ dev_dbg(&qh->dev->dev,
+ "link qh%d-%04x/%p start %d [%d/%d us]\n",
+ period, le32_to_cpup(&qh->hw_info2) & (QH_CMASK | QH_SMASK),
+ qh, qh->start, qh->usecs, qh->c_usecs);
+
+ /* high bandwidth, or otherwise every microframe */
+ if (period == 0)
+ period = 1;
+
+ for (i = qh->start; i < oxu->periodic_size; i += period) {
+ union ehci_shadow *prev = &oxu->pshadow[i];
+ __le32 *hw_p = &oxu->periodic[i];
+ union ehci_shadow here = *prev;
+ __le32 type = 0;
+
+ /* skip the iso nodes at list head */
+ while (here.ptr) {
+ type = Q_NEXT_TYPE(*hw_p);
+ if (type == Q_TYPE_QH)
+ break;
+ prev = periodic_next_shadow(prev, type);
+ hw_p = &here.qh->hw_next;
+ here = *prev;
+ }
+
+ /* sorting each branch by period (slow-->fast)
+ * enables sharing interior tree nodes
+ */
+ while (here.ptr && qh != here.qh) {
+ if (qh->period > here.qh->period)
+ break;
+ prev = &here.qh->qh_next;
+ hw_p = &here.qh->hw_next;
+ here = *prev;
+ }
+ /* link in this qh, unless some earlier pass did that */
+ if (qh != here.qh) {
+ qh->qh_next = here;
+ if (here.qh)
+ qh->hw_next = *hw_p;
+ wmb();
+ prev->qh = qh;
+ *hw_p = QH_NEXT(qh->qh_dma);
+ }
+ }
+ qh->qh_state = QH_STATE_LINKED;
+ qh_get(qh);
+
+ /* update per-qh bandwidth for usbfs */
+ oxu_to_hcd(oxu)->self.bandwidth_allocated += qh->period
+ ? ((qh->usecs + qh->c_usecs) / qh->period)
+ : (qh->usecs * 8);
+
+ /* maybe enable periodic schedule processing */
+ if (!oxu->periodic_sched++)
+ return enable_periodic(oxu);
+
+ return 0;
+}
+
+static void qh_unlink_periodic(struct oxu_hcd *oxu, struct ehci_qh *qh)
+{
+ unsigned i;
+ unsigned period;
+
+ /* FIXME:
+ * IF this isn't high speed
+ * and this qh is active in the current uframe
+ * (and overlay token SplitXstate is false?)
+ * THEN
+ * qh->hw_info1 |= __constant_cpu_to_le32(1 << 7 "ignore");
+ */
+
+ /* high bandwidth, or otherwise part of every microframe */
+ period = qh->period;
+ if (period == 0)
+ period = 1;
+
+ for (i = qh->start; i < oxu->periodic_size; i += period)
+ periodic_unlink(oxu, i, qh);
+
+ /* update per-qh bandwidth for usbfs */
+ oxu_to_hcd(oxu)->self.bandwidth_allocated -= qh->period
+ ? ((qh->usecs + qh->c_usecs) / qh->period)
+ : (qh->usecs * 8);
+
+ dev_dbg(&qh->dev->dev,
+ "unlink qh%d-%04x/%p start %d [%d/%d us]\n",
+ qh->period,
+ le32_to_cpup(&qh->hw_info2) & (QH_CMASK | QH_SMASK),
+ qh, qh->start, qh->usecs, qh->c_usecs);
+
+ /* qh->qh_next still "live" to HC */
+ qh->qh_state = QH_STATE_UNLINK;
+ qh->qh_next.ptr = NULL;
+ qh_put(qh);
+
+ /* maybe turn off periodic schedule */
+ oxu->periodic_sched--;
+ if (!oxu->periodic_sched)
+ (void) disable_periodic(oxu);
+}
+
+static void intr_deschedule(struct oxu_hcd *oxu, struct ehci_qh *qh)
+{
+ unsigned wait;
+
+ qh_unlink_periodic(oxu, qh);
+
+ /* simple/paranoid: always delay, expecting the HC needs to read
+ * qh->hw_next or finish a writeback after SPLIT/CSPLIT ... and
+ * expect khubd to clean up after any CSPLITs we won't issue.
+ * active high speed queues may need bigger delays...
+ */
+ if (list_empty(&qh->qtd_list)
+ || (__constant_cpu_to_le32(QH_CMASK) & qh->hw_info2) != 0)
+ wait = 2;
+ else
+ wait = 55; /* worst case: 3 * 1024 */
+
+ udelay(wait);
+ qh->qh_state = QH_STATE_IDLE;
+ qh->hw_next = EHCI_LIST_END;
+ wmb();
+}
+
+static int check_period(struct oxu_hcd *oxu,
+ unsigned frame, unsigned uframe,
+ unsigned period, unsigned usecs)
+{
+ int claimed;
+
+ /* complete split running into next frame?
+ * given FSTN support, we could sometimes check...
+ */
+ if (uframe >= 8)
+ return 0;
+
+ /*
+ * 80% periodic == 100 usec/uframe available
+ * convert "usecs we need" to "max already claimed"
+ */
+ usecs = 100 - usecs;
+
+ /* we "know" 2 and 4 uframe intervals were rejected; so
+ * for period 0, check _every_ microframe in the schedule.
+ */
+ if (unlikely(period == 0)) {
+ do {
+ for (uframe = 0; uframe < 7; uframe++) {
+ claimed = periodic_usecs(oxu, frame, uframe);
+ if (claimed > usecs)
+ return 0;
+ }
+ } while ((frame += 1) < oxu->periodic_size);
+
+ /* just check the specified uframe, at that period */
+ } else {
+ do {
+ claimed = periodic_usecs(oxu, frame, uframe);
+ if (claimed > usecs)
+ return 0;
+ } while ((frame += period) < oxu->periodic_size);
+ }
+
+ return 1;
+}
+
+static int check_intr_schedule(struct oxu_hcd *oxu,
+ unsigned frame, unsigned uframe,
+ const struct ehci_qh *qh, __le32 *c_maskp)
+{
+ int retval = -ENOSPC;
+
+ if (qh->c_usecs && uframe >= 6) /* FSTN territory? */
+ goto done;
+
+ if (!check_period(oxu, frame, uframe, qh->period, qh->usecs))
+ goto done;
+ if (!qh->c_usecs) {
+ retval = 0;
+ *c_maskp = 0;
+ goto done;
+ }
+
+done:
+ return retval;
+}
+
+/* "first fit" scheduling policy used the first time through,
+ * or when the previous schedule slot can't be re-used.
+ */
+static int qh_schedule(struct oxu_hcd *oxu, struct ehci_qh *qh)
+{
+ int status;
+ unsigned uframe;
+ __le32 c_mask;
+ unsigned frame; /* 0..(qh->period - 1), or NO_FRAME */
+
+ qh_refresh(oxu, qh);
+ qh->hw_next = EHCI_LIST_END;
+ frame = qh->start;
+
+ /* reuse the previous schedule slots, if we can */
+ if (frame < qh->period) {
+ uframe = ffs(le32_to_cpup(&qh->hw_info2) & QH_SMASK);
+ status = check_intr_schedule(oxu, frame, --uframe,
+ qh, &c_mask);
+ } else {
+ uframe = 0;
+ c_mask = 0;
+ status = -ENOSPC;
+ }
+
+ /* else scan the schedule to find a group of slots such that all
+ * uframes have enough periodic bandwidth available.
+ */
+ if (status) {
+ /* "normal" case, uframing flexible except with splits */
+ if (qh->period) {
+ frame = qh->period - 1;
+ do {
+ for (uframe = 0; uframe < 8; uframe++) {
+ status = check_intr_schedule(oxu,
+ frame, uframe, qh,
+ &c_mask);
+ if (status == 0)
+ break;
+ }
+ } while (status && frame--);
+
+ /* qh->period == 0 means every uframe */
+ } else {
+ frame = 0;
+ status = check_intr_schedule(oxu, 0, 0, qh, &c_mask);
+ }
+ if (status)
+ goto done;
+ qh->start = frame;
+
+ /* reset S-frame and (maybe) C-frame masks */
+ qh->hw_info2 &= __constant_cpu_to_le32(~(QH_CMASK | QH_SMASK));
+ qh->hw_info2 |= qh->period
+ ? cpu_to_le32(1 << uframe)
+ : __constant_cpu_to_le32(QH_SMASK);
+ qh->hw_info2 |= c_mask;
+ } else
+ oxu_dbg(oxu, "reused qh %p schedule\n", qh);
+
+ /* stuff into the periodic schedule */
+ status = qh_link_periodic(oxu, qh);
+done:
+ return status;
+}
+
+static int intr_submit(struct oxu_hcd *oxu, struct urb *urb,
+ struct list_head *qtd_list, gfp_t mem_flags)
+{
+ unsigned epnum;
+ unsigned long flags;
+ struct ehci_qh *qh;
+ int status = 0;
+ struct list_head empty;
+
+ /* get endpoint and transfer/schedule data */
+ epnum = urb->ep->desc.bEndpointAddress;
+
+ spin_lock_irqsave(&oxu->lock, flags);
+
+ if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE,
+ &oxu_to_hcd(oxu)->flags))) {
+ status = -ESHUTDOWN;
+ goto done;
+ }
+
+ /* get qh and force any scheduling errors */
+ INIT_LIST_HEAD(&empty);
+ qh = qh_append_tds(oxu, urb, &empty, epnum, &urb->ep->hcpriv);
+ if (qh == NULL) {
+ status = -ENOMEM;
+ goto done;
+ }
+ if (qh->qh_state == QH_STATE_IDLE) {
+ status = qh_schedule(oxu, qh);
+ if (status != 0)
+ goto done;
+ }
+
+ /* then queue the urb's tds to the qh */
+ qh = qh_append_tds(oxu, urb, qtd_list, epnum, &urb->ep->hcpriv);
+ BUG_ON(qh == NULL);
+
+ /* ... update usbfs periodic stats */
+ oxu_to_hcd(oxu)->self.bandwidth_int_reqs++;
+
+done:
+ spin_unlock_irqrestore(&oxu->lock, flags);
+ if (status)
+ qtd_list_free(oxu, urb, qtd_list);
+
+ return status;
+}
+
+static inline int itd_submit(struct oxu_hcd *oxu, struct urb *urb,
+ gfp_t mem_flags)
+{
+ oxu_dbg(oxu, "iso support is missing!\n");
+ return -ENOSYS;
+}
+
+static inline int sitd_submit(struct oxu_hcd *oxu, struct urb *urb,
+ gfp_t mem_flags)
+{
+ oxu_dbg(oxu, "split iso support is missing!\n");
+ return -ENOSYS;
+}
+
+static void scan_periodic(struct oxu_hcd *oxu)
+{
+ unsigned frame, clock, now_uframe, mod;
+ unsigned modified;
+
+ mod = oxu->periodic_size << 3;
+
+ /*
+ * When running, scan from last scan point up to "now"
+ * else clean up by scanning everything that's left.
+ * Touches as few pages as possible: cache-friendly.
+ */
+ now_uframe = oxu->next_uframe;
+ if (HC_IS_RUNNING(oxu_to_hcd(oxu)->state))
+ clock = readl(&oxu->regs->frame_index);
+ else
+ clock = now_uframe + mod - 1;
+ clock %= mod;
+
+ for (;;) {
+ union ehci_shadow q, *q_p;
+ __le32 type, *hw_p;
+ unsigned uframes;
+
+ /* don't scan past the live uframe */
+ frame = now_uframe >> 3;
+ if (frame == (clock >> 3))
+ uframes = now_uframe & 0x07;
+ else {
+ /* safe to scan the whole frame at once */
+ now_uframe |= 0x07;
+ uframes = 8;
+ }
+
+restart:
+ /* scan each element in frame's queue for completions */
+ q_p = &oxu->pshadow[frame];
+ hw_p = &oxu->periodic[frame];
+ q.ptr = q_p->ptr;
+ type = Q_NEXT_TYPE(*hw_p);
+ modified = 0;
+
+ while (q.ptr != NULL) {
+ union ehci_shadow temp;
+ int live;
+
+ live = HC_IS_RUNNING(oxu_to_hcd(oxu)->state);
+ switch (type) {
+ case Q_TYPE_QH:
+ /* handle any completions */
+ temp.qh = qh_get(q.qh);
+ type = Q_NEXT_TYPE(q.qh->hw_next);
+ q = q.qh->qh_next;
+ modified = qh_completions(oxu, temp.qh);
+ if (unlikely(list_empty(&temp.qh->qtd_list)))
+ intr_deschedule(oxu, temp.qh);
+ qh_put(temp.qh);
+ break;
+ default:
+ dbg("corrupt type %d frame %d shadow %p",
+ type, frame, q.ptr);
+ q.ptr = NULL;
+ }
+
+ /* assume completion callbacks modify the queue */
+ if (unlikely(modified))
+ goto restart;
+ }
+
+ /* Stop when we catch up to the HC */
+
+ /* FIXME: this assumes we won't get lapped when
+ * latencies climb; that should be rare, but...
+ * detect it, and just go all the way around.
+ * FLR might help detect this case, so long as latencies
+ * don't exceed periodic_size msec (default 1.024 sec).
+ */
+
+ /* FIXME: likewise assumes HC doesn't halt mid-scan */
+
+ if (now_uframe == clock) {
+ unsigned now;
+
+ if (!HC_IS_RUNNING(oxu_to_hcd(oxu)->state))
+ break;
+ oxu->next_uframe = now_uframe;
+ now = readl(&oxu->regs->frame_index) % mod;
+ if (now_uframe == now)
+ break;
+
+ /* rescan the rest of this frame, then ... */
+ clock = now;
+ } else {
+ now_uframe++;
+ now_uframe %= mod;
+ }
+ }
+}
+
+/* On some systems, leaving remote wakeup enabled prevents system shutdown.
+ * The firmware seems to think that powering off is a wakeup event!
+ * This routine turns off remote wakeup and everything else, on all ports.
+ */
+static void ehci_turn_off_all_ports(struct oxu_hcd *oxu)
+{
+ int port = HCS_N_PORTS(oxu->hcs_params);
+
+ while (port--)
+ writel(PORT_RWC_BITS, &oxu->regs->port_status[port]);
+}
+
+static void ehci_port_power(struct oxu_hcd *oxu, int is_on)
+{
+ unsigned port;
+
+ if (!HCS_PPC(oxu->hcs_params))
+ return;
+
+ oxu_dbg(oxu, "...power%s ports...\n", is_on ? "up" : "down");
+ for (port = HCS_N_PORTS(oxu->hcs_params); port > 0; )
+ (void) oxu_hub_control(oxu_to_hcd(oxu),
+ is_on ? SetPortFeature : ClearPortFeature,
+ USB_PORT_FEAT_POWER,
+ port--, NULL, 0);
+ msleep(20);
+}
+
+/* Called from some interrupts, timers, and so on.
+ * It calls driver completion functions, after dropping oxu->lock.
+ */
+static void ehci_work(struct oxu_hcd *oxu)
+{
+ timer_action_done(oxu, TIMER_IO_WATCHDOG);
+ if (oxu->reclaim_ready)
+ end_unlink_async(oxu);
+
+ /* another CPU may drop oxu->lock during a schedule scan while
+ * it reports urb completions. this flag guards against bogus
+ * attempts at re-entrant schedule scanning.
+ */
+ if (oxu->scanning)
+ return;
+ oxu->scanning = 1;
+ scan_async(oxu);
+ if (oxu->next_uframe != -1)
+ scan_periodic(oxu);
+ oxu->scanning = 0;
+
+ /* the IO watchdog guards against hardware or driver bugs that
+ * misplace IRQs, and should let us run completely without IRQs.
+ * such lossage has been observed on both VT6202 and VT8235.
+ */
+ if (HC_IS_RUNNING(oxu_to_hcd(oxu)->state) &&
+ (oxu->async->qh_next.ptr != NULL ||
+ oxu->periodic_sched != 0))
+ timer_action(oxu, TIMER_IO_WATCHDOG);
+}
+
+static void unlink_async(struct oxu_hcd *oxu, struct ehci_qh *qh)
+{
+ /* if we need to use IAA and it's busy, defer */
+ if (qh->qh_state == QH_STATE_LINKED
+ && oxu->reclaim
+ && HC_IS_RUNNING(oxu_to_hcd(oxu)->state)) {
+ struct ehci_qh *last;
+
+ for (last = oxu->reclaim;
+ last->reclaim;
+ last = last->reclaim)
+ continue;
+ qh->qh_state = QH_STATE_UNLINK_WAIT;
+ last->reclaim = qh;
+
+ /* bypass IAA if the hc can't care */
+ } else if (!HC_IS_RUNNING(oxu_to_hcd(oxu)->state) && oxu->reclaim)
+ end_unlink_async(oxu);
+
+ /* something else might have unlinked the qh by now */
+ if (qh->qh_state == QH_STATE_LINKED)
+ start_unlink_async(oxu, qh);
+}
+
+/*
+ * USB host controller methods
+ */
+
+static irqreturn_t oxu210_hcd_irq(struct usb_hcd *hcd)
+{
+ struct oxu_hcd *oxu = hcd_to_oxu(hcd);
+ u32 status, pcd_status = 0;
+ int bh;
+
+ spin_lock(&oxu->lock);
+
+ status = readl(&oxu->regs->status);
+
+ /* e.g. cardbus physical eject */
+ if (status == ~(u32) 0) {
+ oxu_dbg(oxu, "device removed\n");
+ goto dead;
+ }
+
+ status &= INTR_MASK;
+ if (!status) { /* irq sharing? */
+ spin_unlock(&oxu->lock);
+ return IRQ_NONE;
+ }
+
+ /* clear (just) interrupts */
+ writel(status, &oxu->regs->status);
+ readl(&oxu->regs->command); /* unblock posted write */
+ bh = 0;
+
+#ifdef OXU_VERBOSE_DEBUG
+ /* unrequested/ignored: Frame List Rollover */
+ dbg_status(oxu, "irq", status);
+#endif
+
+ /* INT, ERR, and IAA interrupt rates can be throttled */
+
+ /* normal [4.15.1.2] or error [4.15.1.1] completion */
+ if (likely((status & (STS_INT|STS_ERR)) != 0))
+ bh = 1;
+
+ /* complete the unlinking of some qh [4.15.2.3] */
+ if (status & STS_IAA) {
+ oxu->reclaim_ready = 1;
+ bh = 1;
+ }
+
+ /* remote wakeup [4.3.1] */
+ if (status & STS_PCD) {
+ unsigned i = HCS_N_PORTS(oxu->hcs_params);
+ pcd_status = status;
+
+ /* resume root hub? */
+ if (!(readl(&oxu->regs->command) & CMD_RUN))
+ usb_hcd_resume_root_hub(hcd);
+
+ while (i--) {
+ int pstatus = readl(&oxu->regs->port_status[i]);
+
+ if (pstatus & PORT_OWNER)
+ continue;
+ if (!(pstatus & PORT_RESUME)
+ || oxu->reset_done[i] != 0)
+ continue;
+
+ /* start 20 msec resume signaling from this port,
+ * and make khubd collect PORT_STAT_C_SUSPEND to
+ * stop that signaling.
+ */
+ oxu->reset_done[i] = jiffies + msecs_to_jiffies(20);
+ oxu_dbg(oxu, "port %d remote wakeup\n", i + 1);
+ mod_timer(&hcd->rh_timer, oxu->reset_done[i]);
+ }
+ }
+
+ /* PCI errors [4.15.2.4] */
+ if (unlikely((status & STS_FATAL) != 0)) {
+ /* bogus "fatal" IRQs appear on some chips... why? */
+ status = readl(&oxu->regs->status);
+ dbg_cmd(oxu, "fatal", readl(&oxu->regs->command));
+ dbg_status(oxu, "fatal", status);
+ if (status & STS_HALT) {
+ oxu_err(oxu, "fatal error\n");
+dead:
+ ehci_reset(oxu);
+ writel(0, &oxu->regs->configured_flag);
+ /* generic layer kills/unlinks all urbs, then
+ * uses oxu_stop to clean up the rest
+ */
+ bh = 1;
+ }
+ }
+
+ if (bh)
+ ehci_work(oxu);
+ spin_unlock(&oxu->lock);
+ if (pcd_status & STS_PCD)
+ usb_hcd_poll_rh_status(hcd);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t oxu_irq(struct usb_hcd *hcd)
+{
+ struct oxu_hcd *oxu = hcd_to_oxu(hcd);
+ int ret = IRQ_HANDLED;
+
+ u32 status = oxu_readl(hcd->regs, OXU_CHIPIRQSTATUS);
+ u32 enable = oxu_readl(hcd->regs, OXU_CHIPIRQEN_SET);
+
+ /* Disable all interrupt */
+ oxu_writel(hcd->regs, OXU_CHIPIRQEN_CLR, enable);
+
+ if ((oxu->is_otg && (status & OXU_USBOTGI)) ||
+ (!oxu->is_otg && (status & OXU_USBSPHI)))
+ oxu210_hcd_irq(hcd);
+ else
+ ret = IRQ_NONE;
+
+ /* Enable all interrupt back */
+ oxu_writel(hcd->regs, OXU_CHIPIRQEN_SET, enable);
+
+ return ret;
+}
+
+static void oxu_watchdog(unsigned long param)
+{
+ struct oxu_hcd *oxu = (struct oxu_hcd *) param;
+ unsigned long flags;
+
+ spin_lock_irqsave(&oxu->lock, flags);
+
+ /* lost IAA irqs wedge things badly; seen with a vt8235 */
+ if (oxu->reclaim) {
+ u32 status = readl(&oxu->regs->status);
+ if (status & STS_IAA) {
+ oxu_vdbg(oxu, "lost IAA\n");
+ writel(STS_IAA, &oxu->regs->status);
+ oxu->reclaim_ready = 1;
+ }
+ }
+
+ /* stop async processing after it's idled a bit */
+ if (test_bit(TIMER_ASYNC_OFF, &oxu->actions))
+ start_unlink_async(oxu, oxu->async);
+
+ /* oxu could run by timer, without IRQs ... */
+ ehci_work(oxu);
+
+ spin_unlock_irqrestore(&oxu->lock, flags);
+}
+
+/* One-time init, only for memory state.
+ */
+static int oxu_hcd_init(struct usb_hcd *hcd)
+{
+ struct oxu_hcd *oxu = hcd_to_oxu(hcd);
+ u32 temp;
+ int retval;
+ u32 hcc_params;
+
+ spin_lock_init(&oxu->lock);
+
+ init_timer(&oxu->watchdog);
+ oxu->watchdog.function = oxu_watchdog;
+ oxu->watchdog.data = (unsigned long) oxu;
+
+ /*
+ * hw default: 1K periodic list heads, one per frame.
+ * periodic_size can shrink by USBCMD update if hcc_params allows.
+ */
+ oxu->periodic_size = DEFAULT_I_TDPS;
+ retval = ehci_mem_init(oxu, GFP_KERNEL);
+ if (retval < 0)
+ return retval;
+
+ /* controllers may cache some of the periodic schedule ... */
+ hcc_params = readl(&oxu->caps->hcc_params);
+ if (HCC_ISOC_CACHE(hcc_params)) /* full frame cache */
+ oxu->i_thresh = 8;
+ else /* N microframes cached */
+ oxu->i_thresh = 2 + HCC_ISOC_THRES(hcc_params);
+
+ oxu->reclaim = NULL;
+ oxu->reclaim_ready = 0;
+ oxu->next_uframe = -1;
+
+ /*
+ * dedicate a qh for the async ring head, since we couldn't unlink
+ * a 'real' qh without stopping the async schedule [4.8]. use it
+ * as the 'reclamation list head' too.
+ * its dummy is used in hw_alt_next of many tds, to prevent the qh
+ * from automatically advancing to the next td after short reads.
+ */
+ oxu->async->qh_next.qh = NULL;
+ oxu->async->hw_next = QH_NEXT(oxu->async->qh_dma);
+ oxu->async->hw_info1 = cpu_to_le32(QH_HEAD);
+ oxu->async->hw_token = cpu_to_le32(QTD_STS_HALT);
+ oxu->async->hw_qtd_next = EHCI_LIST_END;
+ oxu->async->qh_state = QH_STATE_LINKED;
+ oxu->async->hw_alt_next = QTD_NEXT(oxu->async->dummy->qtd_dma);
+
+ /* clear interrupt enables, set irq latency */
+ if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
+ log2_irq_thresh = 0;
+ temp = 1 << (16 + log2_irq_thresh);
+ if (HCC_CANPARK(hcc_params)) {
+ /* HW default park == 3, on hardware that supports it (like
+ * NVidia and ALI silicon), maximizes throughput on the async
+ * schedule by avoiding QH fetches between transfers.
+ *
+ * With fast usb storage devices and NForce2, "park" seems to
+ * make problems: throughput reduction (!), data errors...
+ */
+ if (park) {
+ park = min(park, (unsigned) 3);
+ temp |= CMD_PARK;
+ temp |= park << 8;
+ }
+ oxu_dbg(oxu, "park %d\n", park);
+ }
+ if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
+ /* periodic schedule size can be smaller than default */
+ temp &= ~(3 << 2);
+ temp |= (EHCI_TUNE_FLS << 2);
+ }
+ oxu->command = temp;
+
+ return 0;
+}
+
+/* Called during probe() after chip reset completes.
+ */
+static int oxu_reset(struct usb_hcd *hcd)
+{
+ struct oxu_hcd *oxu = hcd_to_oxu(hcd);
+ int ret;
+
+ spin_lock_init(&oxu->mem_lock);
+ INIT_LIST_HEAD(&oxu->urb_list);
+ oxu->urb_len = 0;
+
+ /* FIMXE */
+ hcd->self.controller->dma_mask = 0UL;
+
+ if (oxu->is_otg) {
+ oxu->caps = hcd->regs + OXU_OTG_CAP_OFFSET;
+ oxu->regs = hcd->regs + OXU_OTG_CAP_OFFSET + \
+ HC_LENGTH(readl(&oxu->caps->hc_capbase));
+
+ oxu->mem = hcd->regs + OXU_SPH_MEM;
+ } else {
+ oxu->caps = hcd->regs + OXU_SPH_CAP_OFFSET;
+ oxu->regs = hcd->regs + OXU_SPH_CAP_OFFSET + \
+ HC_LENGTH(readl(&oxu->caps->hc_capbase));
+
+ oxu->mem = hcd->regs + OXU_OTG_MEM;
+ }
+
+ oxu->hcs_params = readl(&oxu->caps->hcs_params);
+ oxu->sbrn = 0x20;
+
+ ret = oxu_hcd_init(hcd);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int oxu_run(struct usb_hcd *hcd)
+{
+ struct oxu_hcd *oxu = hcd_to_oxu(hcd);
+ int retval;
+ u32 temp, hcc_params;
+
+ hcd->uses_new_polling = 1;
+ hcd->poll_rh = 0;
+
+ /* EHCI spec section 4.1 */
+ retval = ehci_reset(oxu);
+ if (retval != 0) {
+ ehci_mem_cleanup(oxu);
+ return retval;
+ }
+ writel(oxu->periodic_dma, &oxu->regs->frame_list);
+ writel((u32) oxu->async->qh_dma, &oxu->regs->async_next);
+
+ /* hcc_params controls whether oxu->regs->segment must (!!!)
+ * be used; it constrains QH/ITD/SITD and QTD locations.
+ * pci_pool consistent memory always uses segment zero.
+ * streaming mappings for I/O buffers, like pci_map_single(),
+ * can return segments above 4GB, if the device allows.
+ *
+ * NOTE: the dma mask is visible through dma_supported(), so
+ * drivers can pass this info along ... like NETIF_F_HIGHDMA,
+ * Scsi_Host.highmem_io, and so forth. It's readonly to all
+ * host side drivers though.
+ */
+ hcc_params = readl(&oxu->caps->hcc_params);
+ if (HCC_64BIT_ADDR(hcc_params))
+ writel(0, &oxu->regs->segment);
+
+ oxu->command &= ~(CMD_LRESET | CMD_IAAD | CMD_PSE |
+ CMD_ASE | CMD_RESET);
+ oxu->command |= CMD_RUN;
+ writel(oxu->command, &oxu->regs->command);
+ dbg_cmd(oxu, "init", oxu->command);
+
+ /*
+ * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
+ * are explicitly handed to companion controller(s), so no TT is
+ * involved with the root hub. (Except where one is integrated,
+ * and there's no companion controller unless maybe for USB OTG.)
+ */
+ hcd->state = HC_STATE_RUNNING;
+ writel(FLAG_CF, &oxu->regs->configured_flag);
+ readl(&oxu->regs->command); /* unblock posted writes */
+
+ temp = HC_VERSION(readl(&oxu->caps->hc_capbase));
+ oxu_info(oxu, "USB %x.%x started, quasi-EHCI %x.%02x, driver %s%s\n",
+ ((oxu->sbrn & 0xf0)>>4), (oxu->sbrn & 0x0f),
+ temp >> 8, temp & 0xff, DRIVER_VERSION,
+ ignore_oc ? ", overcurrent ignored" : "");
+
+ writel(INTR_MASK, &oxu->regs->intr_enable); /* Turn On Interrupts */
+
+ return 0;
+}
+
+static void oxu_stop(struct usb_hcd *hcd)
+{
+ struct oxu_hcd *oxu = hcd_to_oxu(hcd);
+
+ /* Turn off port power on all root hub ports. */
+ ehci_port_power(oxu, 0);
+
+ /* no more interrupts ... */
+ del_timer_sync(&oxu->watchdog);
+
+ spin_lock_irq(&oxu->lock);
+ if (HC_IS_RUNNING(hcd->state))
+ ehci_quiesce(oxu);
+
+ ehci_reset(oxu);
+ writel(0, &oxu->regs->intr_enable);
+ spin_unlock_irq(&oxu->lock);
+
+ /* let companion controllers work when we aren't */
+ writel(0, &oxu->regs->configured_flag);
+
+ /* root hub is shut down separately (first, when possible) */
+ spin_lock_irq(&oxu->lock);
+ if (oxu->async)
+ ehci_work(oxu);
+ spin_unlock_irq(&oxu->lock);
+ ehci_mem_cleanup(oxu);
+
+ dbg_status(oxu, "oxu_stop completed", readl(&oxu->regs->status));
+}
+
+/* Kick in for silicon on any bus (not just pci, etc).
+ * This forcibly disables dma and IRQs, helping kexec and other cases
+ * where the next system software may expect clean state.
+ */
+static void oxu_shutdown(struct usb_hcd *hcd)
+{
+ struct oxu_hcd *oxu = hcd_to_oxu(hcd);
+
+ (void) ehci_halt(oxu);
+ ehci_turn_off_all_ports(oxu);
+
+ /* make BIOS/etc use companion controller during reboot */
+ writel(0, &oxu->regs->configured_flag);
+
+ /* unblock posted writes */
+ readl(&oxu->regs->configured_flag);
+}
+
+/* Non-error returns are a promise to giveback() the urb later
+ * we drop ownership so next owner (or urb unlink) can get it
+ *
+ * urb + dev is in hcd.self.controller.urb_list
+ * we're queueing TDs onto software and hardware lists
+ *
+ * hcd-specific init for hcpriv hasn't been done yet
+ *
+ * NOTE: control, bulk, and interrupt share the same code to append TDs
+ * to a (possibly active) QH, and the same QH scanning code.
+ */
+static int __oxu_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
+ gfp_t mem_flags)
+{
+ struct oxu_hcd *oxu = hcd_to_oxu(hcd);
+ struct list_head qtd_list;
+
+ INIT_LIST_HEAD(&qtd_list);
+
+ switch (usb_pipetype(urb->pipe)) {
+ case PIPE_CONTROL:
+ case PIPE_BULK:
+ default:
+ if (!qh_urb_transaction(oxu, urb, &qtd_list, mem_flags))
+ return -ENOMEM;
+ return submit_async(oxu, urb, &qtd_list, mem_flags);
+
+ case PIPE_INTERRUPT:
+ if (!qh_urb_transaction(oxu, urb, &qtd_list, mem_flags))
+ return -ENOMEM;
+ return intr_submit(oxu, urb, &qtd_list, mem_flags);
+
+ case PIPE_ISOCHRONOUS:
+ if (urb->dev->speed == USB_SPEED_HIGH)
+ return itd_submit(oxu, urb, mem_flags);
+ else
+ return sitd_submit(oxu, urb, mem_flags);
+ }
+}
+
+/* This function is responsible for breaking URBs with big data size
+ * into smaller size and processing small urbs in sequence.
+ */
+static int oxu_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
+ gfp_t mem_flags)
+{
+ struct oxu_hcd *oxu = hcd_to_oxu(hcd);
+ int num, rem;
+ int transfer_buffer_length;
+ void *transfer_buffer;
+ struct urb *murb;
+ int i, ret;
+
+ /* If not bulk pipe just enqueue the URB */
+ if (!usb_pipebulk(urb->pipe))
+ return __oxu_urb_enqueue(hcd, urb, mem_flags);
+
+ /* Otherwise we should verify the USB transfer buffer size! */
+ transfer_buffer = urb->transfer_buffer;
+ transfer_buffer_length = urb->transfer_buffer_length;
+
+ num = urb->transfer_buffer_length / 4096;
+ rem = urb->transfer_buffer_length % 4096;
+ if (rem != 0)
+ num++;
+
+ /* If URB is smaller than 4096 bytes just enqueue it! */
+ if (num == 1)
+ return __oxu_urb_enqueue(hcd, urb, mem_flags);
+
+ /* Ok, we have more job to do! :) */
+
+ for (i = 0; i < num - 1; i++) {
+ /* Get free micro URB poll till a free urb is recieved */
+
+ do {
+ murb = (struct urb *) oxu_murb_alloc(oxu);
+ if (!murb)
+ schedule();
+ } while (!murb);
+
+ /* Coping the urb */
+ memcpy(murb, urb, sizeof(struct urb));
+
+ murb->transfer_buffer_length = 4096;
+ murb->transfer_buffer = transfer_buffer + i * 4096;
+
+ /* Null pointer for the encodes that this is a micro urb */
+ murb->complete = NULL;
+
+ ((struct oxu_murb *) murb)->main = urb;
+ ((struct oxu_murb *) murb)->last = 0;
+
+ /* This loop is to guarantee urb to be processed when there's
+ * not enough resources at a particular time by retrying.
+ */
+ do {
+ ret = __oxu_urb_enqueue(hcd, murb, mem_flags);
+ if (ret)
+ schedule();
+ } while (ret);
+ }
+
+ /* Last urb requires special handling */
+
+ /* Get free micro URB poll till a free urb is recieved */
+ do {
+ murb = (struct urb *) oxu_murb_alloc(oxu);
+ if (!murb)
+ schedule();
+ } while (!murb);
+
+ /* Coping the urb */
+ memcpy(murb, urb, sizeof(struct urb));
+
+ murb->transfer_buffer_length = rem > 0 ? rem : 4096;
+ murb->transfer_buffer = transfer_buffer + (num - 1) * 4096;
+
+ /* Null pointer for the encodes that this is a micro urb */
+ murb->complete = NULL;
+
+ ((struct oxu_murb *) murb)->main = urb;
+ ((struct oxu_murb *) murb)->last = 1;
+
+ do {
+ ret = __oxu_urb_enqueue(hcd, murb, mem_flags);
+ if (ret)
+ schedule();
+ } while (ret);
+
+ return ret;
+}
+
+/* Remove from hardware lists.
+ * Completions normally happen asynchronously
+ */
+static int oxu_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
+{
+ struct oxu_hcd *oxu = hcd_to_oxu(hcd);
+ struct ehci_qh *qh;
+ unsigned long flags;
+
+ spin_lock_irqsave(&oxu->lock, flags);
+ switch (usb_pipetype(urb->pipe)) {
+ case PIPE_CONTROL:
+ case PIPE_BULK:
+ default:
+ qh = (struct ehci_qh *) urb->hcpriv;
+ if (!qh)
+ break;
+ unlink_async(oxu, qh);
+ break;
+
+ case PIPE_INTERRUPT:
+ qh = (struct ehci_qh *) urb->hcpriv;
+ if (!qh)
+ break;
+ switch (qh->qh_state) {
+ case QH_STATE_LINKED:
+ intr_deschedule(oxu, qh);
+ /* FALL THROUGH */
+ case QH_STATE_IDLE:
+ qh_completions(oxu, qh);
+ break;
+ default:
+ oxu_dbg(oxu, "bogus qh %p state %d\n",
+ qh, qh->qh_state);
+ goto done;
+ }
+
+ /* reschedule QH iff another request is queued */
+ if (!list_empty(&qh->qtd_list)
+ && HC_IS_RUNNING(hcd->state)) {
+ int status;
+
+ status = qh_schedule(oxu, qh);
+ spin_unlock_irqrestore(&oxu->lock, flags);
+
+ if (status != 0) {
+ /* shouldn't happen often, but ...
+ * FIXME kill those tds' urbs
+ */
+ err("can't reschedule qh %p, err %d",
+ qh, status);
+ }
+ return status;
+ }
+ break;
+ }
+done:
+ spin_unlock_irqrestore(&oxu->lock, flags);
+ return 0;
+}
+
+/* Bulk qh holds the data toggle */
+static void oxu_endpoint_disable(struct usb_hcd *hcd,
+ struct usb_host_endpoint *ep)
+{
+ struct oxu_hcd *oxu = hcd_to_oxu(hcd);
+ unsigned long flags;
+ struct ehci_qh *qh, *tmp;
+
+ /* ASSERT: any requests/urbs are being unlinked */
+ /* ASSERT: nobody can be submitting urbs for this any more */
+
+rescan:
+ spin_lock_irqsave(&oxu->lock, flags);
+ qh = ep->hcpriv;
+ if (!qh)
+ goto done;
+
+ /* endpoints can be iso streams. for now, we don't
+ * accelerate iso completions ... so spin a while.
+ */
+ if (qh->hw_info1 == 0) {
+ oxu_vdbg(oxu, "iso delay\n");
+ goto idle_timeout;
+ }
+
+ if (!HC_IS_RUNNING(hcd->state))
+ qh->qh_state = QH_STATE_IDLE;
+ switch (qh->qh_state) {
+ case QH_STATE_LINKED:
+ for (tmp = oxu->async->qh_next.qh;
+ tmp && tmp != qh;
+ tmp = tmp->qh_next.qh)
+ continue;
+ /* periodic qh self-unlinks on empty */
+ if (!tmp)
+ goto nogood;
+ unlink_async(oxu, qh);
+ /* FALL THROUGH */
+ case QH_STATE_UNLINK: /* wait for hw to finish? */
+idle_timeout:
+ spin_unlock_irqrestore(&oxu->lock, flags);
+ schedule_timeout_uninterruptible(1);
+ goto rescan;
+ case QH_STATE_IDLE: /* fully unlinked */
+ if (list_empty(&qh->qtd_list)) {
+ qh_put(qh);
+ break;
+ }
+ /* else FALL THROUGH */
+ default:
+nogood:
+ /* caller was supposed to have unlinked any requests;
+ * that's not our job. just leak this memory.
+ */
+ oxu_err(oxu, "qh %p (#%02x) state %d%s\n",
+ qh, ep->desc.bEndpointAddress, qh->qh_state,
+ list_empty(&qh->qtd_list) ? "" : "(has tds)");
+ break;
+ }
+ ep->hcpriv = NULL;
+done:
+ spin_unlock_irqrestore(&oxu->lock, flags);
+ return;
+}
+
+static int oxu_get_frame(struct usb_hcd *hcd)
+{
+ struct oxu_hcd *oxu = hcd_to_oxu(hcd);
+
+ return (readl(&oxu->regs->frame_index) >> 3) %
+ oxu->periodic_size;
+}
+
+/* Build "status change" packet (one or two bytes) from HC registers */
+static int oxu_hub_status_data(struct usb_hcd *hcd, char *buf)
+{
+ struct oxu_hcd *oxu = hcd_to_oxu(hcd);
+ u32 temp, mask, status = 0;
+ int ports, i, retval = 1;
+ unsigned long flags;
+
+ /* if !USB_SUSPEND, root hub timers won't get shut down ... */
+ if (!HC_IS_RUNNING(hcd->state))
+ return 0;
+
+ /* init status to no-changes */
+ buf[0] = 0;
+ ports = HCS_N_PORTS(oxu->hcs_params);
+ if (ports > 7) {
+ buf[1] = 0;
+ retval++;
+ }
+
+ /* Some boards (mostly VIA?) report bogus overcurrent indications,
+ * causing massive log spam unless we completely ignore them. It
+ * may be relevant that VIA VT8235 controlers, where PORT_POWER is
+ * always set, seem to clear PORT_OCC and PORT_CSC when writing to
+ * PORT_POWER; that's surprising, but maybe within-spec.
+ */
+ if (!ignore_oc)
+ mask = PORT_CSC | PORT_PEC | PORT_OCC;
+ else
+ mask = PORT_CSC | PORT_PEC;
+
+ /* no hub change reports (bit 0) for now (power, ...) */
+
+ /* port N changes (bit N)? */
+ spin_lock_irqsave(&oxu->lock, flags);
+ for (i = 0; i < ports; i++) {
+ temp = readl(&oxu->regs->port_status[i]);
+
+ /*
+ * Return status information even for ports with OWNER set.
+ * Otherwise khubd wouldn't see the disconnect event when a
+ * high-speed device is switched over to the companion
+ * controller by the user.
+ */
+
+ if (!(temp & PORT_CONNECT))
+ oxu->reset_done[i] = 0;
+ if ((temp & mask) != 0 || ((temp & PORT_RESUME) != 0 &&
+ time_after_eq(jiffies, oxu->reset_done[i]))) {
+ if (i < 7)
+ buf[0] |= 1 << (i + 1);
+ else
+ buf[1] |= 1 << (i - 7);
+ status = STS_PCD;
+ }
+ }
+ /* FIXME autosuspend idle root hubs */
+ spin_unlock_irqrestore(&oxu->lock, flags);
+ return status ? retval : 0;
+}
+
+/* Returns the speed of a device attached to a port on the root hub. */
+static inline unsigned int oxu_port_speed(struct oxu_hcd *oxu,
+ unsigned int portsc)
+{
+ switch ((portsc >> 26) & 3) {
+ case 0:
+ return 0;
+ case 1:
+ return 1 << USB_PORT_FEAT_LOWSPEED;
+ case 2:
+ default:
+ return 1 << USB_PORT_FEAT_HIGHSPEED;
+ }
+}
+
+#define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
+static int oxu_hub_control(struct usb_hcd *hcd, u16 typeReq,
+ u16 wValue, u16 wIndex, char *buf, u16 wLength)
+{
+ struct oxu_hcd *oxu = hcd_to_oxu(hcd);
+ int ports = HCS_N_PORTS(oxu->hcs_params);
+ u32 __iomem *status_reg = &oxu->regs->port_status[wIndex - 1];
+ u32 temp, status;
+ unsigned long flags;
+ int retval = 0;
+ unsigned selector;
+
+ /*
+ * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
+ * HCS_INDICATOR may say we can change LEDs to off/amber/green.
+ * (track current state ourselves) ... blink for diagnostics,
+ * power, "this is the one", etc. EHCI spec supports this.
+ */
+
+ spin_lock_irqsave(&oxu->lock, flags);
+ switch (typeReq) {
+ case ClearHubFeature:
+ switch (wValue) {
+ case C_HUB_LOCAL_POWER:
+ case C_HUB_OVER_CURRENT:
+ /* no hub-wide feature/status flags */
+ break;
+ default:
+ goto error;
+ }
+ break;
+ case ClearPortFeature:
+ if (!wIndex || wIndex > ports)
+ goto error;
+ wIndex--;
+ temp = readl(status_reg);
+
+ /*
+ * Even if OWNER is set, so the port is owned by the
+ * companion controller, khubd needs to be able to clear
+ * the port-change status bits (especially
+ * USB_PORT_FEAT_C_CONNECTION).
+ */
+
+ switch (wValue) {
+ case USB_PORT_FEAT_ENABLE:
+ writel(temp & ~PORT_PE, status_reg);
+ break;
+ case USB_PORT_FEAT_C_ENABLE:
+ writel((temp & ~PORT_RWC_BITS) | PORT_PEC, status_reg);
+ break;
+ case USB_PORT_FEAT_SUSPEND:
+ if (temp & PORT_RESET)
+ goto error;
+ if (temp & PORT_SUSPEND) {
+ if ((temp & PORT_PE) == 0)
+ goto error;
+ /* resume signaling for 20 msec */
+ temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
+ writel(temp | PORT_RESUME, status_reg);
+ oxu->reset_done[wIndex] = jiffies
+ + msecs_to_jiffies(20);
+ }
+ break;
+ case USB_PORT_FEAT_C_SUSPEND:
+ /* we auto-clear this feature */
+ break;
+ case USB_PORT_FEAT_POWER:
+ if (HCS_PPC(oxu->hcs_params))
+ writel(temp & ~(PORT_RWC_BITS | PORT_POWER),
+ status_reg);
+ break;
+ case USB_PORT_FEAT_C_CONNECTION:
+ writel((temp & ~PORT_RWC_BITS) | PORT_CSC, status_reg);
+ break;
+ case USB_PORT_FEAT_C_OVER_CURRENT:
+ writel((temp & ~PORT_RWC_BITS) | PORT_OCC, status_reg);
+ break;
+ case USB_PORT_FEAT_C_RESET:
+ /* GetPortStatus clears reset */
+ break;
+ default:
+ goto error;
+ }
+ readl(&oxu->regs->command); /* unblock posted write */
+ break;
+ case GetHubDescriptor:
+ ehci_hub_descriptor(oxu, (struct usb_hub_descriptor *)
+ buf);
+ break;
+ case GetHubStatus:
+ /* no hub-wide feature/status flags */
+ memset(buf, 0, 4);
+ break;
+ case GetPortStatus:
+ if (!wIndex || wIndex > ports)
+ goto error;
+ wIndex--;
+ status = 0;
+ temp = readl(status_reg);
+
+ /* wPortChange bits */
+ if (temp & PORT_CSC)
+ status |= 1 << USB_PORT_FEAT_C_CONNECTION;
+ if (temp & PORT_PEC)
+ status |= 1 << USB_PORT_FEAT_C_ENABLE;
+ if ((temp & PORT_OCC) && !ignore_oc)
+ status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
+
+ /* whoever resumes must GetPortStatus to complete it!! */
+ if (temp & PORT_RESUME) {
+
+ /* Remote Wakeup received? */
+ if (!oxu->reset_done[wIndex]) {
+ /* resume signaling for 20 msec */
+ oxu->reset_done[wIndex] = jiffies
+ + msecs_to_jiffies(20);
+ /* check the port again */
+ mod_timer(&oxu_to_hcd(oxu)->rh_timer,
+ oxu->reset_done[wIndex]);
+ }
+
+ /* resume completed? */
+ else if (time_after_eq(jiffies,
+ oxu->reset_done[wIndex])) {
+ status |= 1 << USB_PORT_FEAT_C_SUSPEND;
+ oxu->reset_done[wIndex] = 0;
+
+ /* stop resume signaling */
+ temp = readl(status_reg);
+ writel(temp & ~(PORT_RWC_BITS | PORT_RESUME),
+ status_reg);
+ retval = handshake(oxu, status_reg,
+ PORT_RESUME, 0, 2000 /* 2msec */);
+ if (retval != 0) {
+ oxu_err(oxu,
+ "port %d resume error %d\n",
+ wIndex + 1, retval);
+ goto error;
+ }
+ temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
+ }
+ }
+
+ /* whoever resets must GetPortStatus to complete it!! */
+ if ((temp & PORT_RESET)
+ && time_after_eq(jiffies,
+ oxu->reset_done[wIndex])) {
+ status |= 1 << USB_PORT_FEAT_C_RESET;
+ oxu->reset_done[wIndex] = 0;
+
+ /* force reset to complete */
+ writel(temp & ~(PORT_RWC_BITS | PORT_RESET),
+ status_reg);
+ /* REVISIT: some hardware needs 550+ usec to clear
+ * this bit; seems too long to spin routinely...
+ */
+ retval = handshake(oxu, status_reg,
+ PORT_RESET, 0, 750);
+ if (retval != 0) {
+ oxu_err(oxu, "port %d reset error %d\n",
+ wIndex + 1, retval);
+ goto error;
+ }
+
+ /* see what we found out */
+ temp = check_reset_complete(oxu, wIndex, status_reg,
+ readl(status_reg));
+ }
+
+ /* transfer dedicated ports to the companion hc */
+ if ((temp & PORT_CONNECT) &&
+ test_bit(wIndex, &oxu->companion_ports)) {
+ temp &= ~PORT_RWC_BITS;
+ temp |= PORT_OWNER;
+ writel(temp, status_reg);
+ oxu_dbg(oxu, "port %d --> companion\n", wIndex + 1);
+ temp = readl(status_reg);
+ }
+
+ /*
+ * Even if OWNER is set, there's no harm letting khubd
+ * see the wPortStatus values (they should all be 0 except
+ * for PORT_POWER anyway).
+ */
+
+ if (temp & PORT_CONNECT) {
+ status |= 1 << USB_PORT_FEAT_CONNECTION;
+ /* status may be from integrated TT */
+ status |= oxu_port_speed(oxu, temp);
+ }
+ if (temp & PORT_PE)
+ status |= 1 << USB_PORT_FEAT_ENABLE;
+ if (temp & (PORT_SUSPEND|PORT_RESUME))
+ status |= 1 << USB_PORT_FEAT_SUSPEND;
+ if (temp & PORT_OC)
+ status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
+ if (temp & PORT_RESET)
+ status |= 1 << USB_PORT_FEAT_RESET;
+ if (temp & PORT_POWER)
+ status |= 1 << USB_PORT_FEAT_POWER;
+
+#ifndef OXU_VERBOSE_DEBUG
+ if (status & ~0xffff) /* only if wPortChange is interesting */
+#endif
+ dbg_port(oxu, "GetStatus", wIndex + 1, temp);
+ put_unaligned(cpu_to_le32(status), (__le32 *) buf);
+ break;
+ case SetHubFeature:
+ switch (wValue) {
+ case C_HUB_LOCAL_POWER:
+ case C_HUB_OVER_CURRENT:
+ /* no hub-wide feature/status flags */
+ break;
+ default:
+ goto error;
+ }
+ break;
+ case SetPortFeature:
+ selector = wIndex >> 8;
+ wIndex &= 0xff;
+ if (!wIndex || wIndex > ports)
+ goto error;
+ wIndex--;
+ temp = readl(status_reg);
+ if (temp & PORT_OWNER)
+ break;
+
+ temp &= ~PORT_RWC_BITS;
+ switch (wValue) {
+ case USB_PORT_FEAT_SUSPEND:
+ if ((temp & PORT_PE) == 0
+ || (temp & PORT_RESET) != 0)
+ goto error;
+ if (device_may_wakeup(&hcd->self.root_hub->dev))
+ temp |= PORT_WAKE_BITS;
+ writel(temp | PORT_SUSPEND, status_reg);
+ break;
+ case USB_PORT_FEAT_POWER:
+ if (HCS_PPC(oxu->hcs_params))
+ writel(temp | PORT_POWER, status_reg);
+ break;
+ case USB_PORT_FEAT_RESET:
+ if (temp & PORT_RESUME)
+ goto error;
+ /* line status bits may report this as low speed,
+ * which can be fine if this root hub has a
+ * transaction translator built in.
+ */
+ oxu_vdbg(oxu, "port %d reset\n", wIndex + 1);
+ temp |= PORT_RESET;
+ temp &= ~PORT_PE;
+
+ /*
+ * caller must wait, then call GetPortStatus
+ * usb 2.0 spec says 50 ms resets on root
+ */
+ oxu->reset_done[wIndex] = jiffies
+ + msecs_to_jiffies(50);
+ writel(temp, status_reg);
+ break;
+
+ /* For downstream facing ports (these): one hub port is put
+ * into test mode according to USB2 11.24.2.13, then the hub
+ * must be reset (which for root hub now means rmmod+modprobe,
+ * or else system reboot). See EHCI 2.3.9 and 4.14 for info
+ * about the EHCI-specific stuff.
+ */
+ case USB_PORT_FEAT_TEST:
+ if (!selector || selector > 5)
+ goto error;
+ ehci_quiesce(oxu);
+ ehci_halt(oxu);
+ temp |= selector << 16;
+ writel(temp, status_reg);
+ break;
+
+ default:
+ goto error;
+ }
+ readl(&oxu->regs->command); /* unblock posted writes */
+ break;
+
+ default:
+error:
+ /* "stall" on error */
+ retval = -EPIPE;
+ }
+ spin_unlock_irqrestore(&oxu->lock, flags);
+ return retval;
+}
+
+#ifdef CONFIG_PM
+
+static int oxu_bus_suspend(struct usb_hcd *hcd)
+{
+ struct oxu_hcd *oxu = hcd_to_oxu(hcd);
+ int port;
+ int mask;
+
+ oxu_dbg(oxu, "suspend root hub\n");
+
+ if (time_before(jiffies, oxu->next_statechange))
+ msleep(5);
+
+ port = HCS_N_PORTS(oxu->hcs_params);
+ spin_lock_irq(&oxu->lock);
+
+ /* stop schedules, clean any completed work */
+ if (HC_IS_RUNNING(hcd->state)) {
+ ehci_quiesce(oxu);
+ hcd->state = HC_STATE_QUIESCING;
+ }
+ oxu->command = readl(&oxu->regs->command);
+ if (oxu->reclaim)
+ oxu->reclaim_ready = 1;
+ ehci_work(oxu);
+
+ /* Unlike other USB host controller types, EHCI doesn't have
+ * any notion of "global" or bus-wide suspend. The driver has
+ * to manually suspend all the active unsuspended ports, and
+ * then manually resume them in the bus_resume() routine.
+ */
+ oxu->bus_suspended = 0;
+ while (port--) {
+ u32 __iomem *reg = &oxu->regs->port_status[port];
+ u32 t1 = readl(reg) & ~PORT_RWC_BITS;
+ u32 t2 = t1;
+
+ /* keep track of which ports we suspend */
+ if ((t1 & PORT_PE) && !(t1 & PORT_OWNER) &&
+ !(t1 & PORT_SUSPEND)) {
+ t2 |= PORT_SUSPEND;
+ set_bit(port, &oxu->bus_suspended);
+ }
+
+ /* enable remote wakeup on all ports */
+ if (device_may_wakeup(&hcd->self.root_hub->dev))
+ t2 |= PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E;
+ else
+ t2 &= ~(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E);
+
+ if (t1 != t2) {
+ oxu_vdbg(oxu, "port %d, %08x -> %08x\n",
+ port + 1, t1, t2);
+ writel(t2, reg);
+ }
+ }
+
+ /* turn off now-idle HC */
+ del_timer_sync(&oxu->watchdog);
+ ehci_halt(oxu);
+ hcd->state = HC_STATE_SUSPENDED;
+
+ /* allow remote wakeup */
+ mask = INTR_MASK;
+ if (!device_may_wakeup(&hcd->self.root_hub->dev))
+ mask &= ~STS_PCD;
+ writel(mask, &oxu->regs->intr_enable);
+ readl(&oxu->regs->intr_enable);
+
+ oxu->next_statechange = jiffies + msecs_to_jiffies(10);
+ spin_unlock_irq(&oxu->lock);
+ return 0;
+}
+
+/* Caller has locked the root hub, and should reset/reinit on error */
+static int oxu_bus_resume(struct usb_hcd *hcd)
+{
+ struct oxu_hcd *oxu = hcd_to_oxu(hcd);
+ u32 temp;
+ int i;
+
+ if (time_before(jiffies, oxu->next_statechange))
+ msleep(5);
+ spin_lock_irq(&oxu->lock);
+
+ /* Ideally and we've got a real resume here, and no port's power
+ * was lost. (For PCI, that means Vaux was maintained.) But we
+ * could instead be restoring a swsusp snapshot -- so that BIOS was
+ * the last user of the controller, not reset/pm hardware keeping
+ * state we gave to it.
+ */
+ temp = readl(&oxu->regs->intr_enable);
+ oxu_dbg(oxu, "resume root hub%s\n", temp ? "" : " after power loss");
+
+ /* at least some APM implementations will try to deliver
+ * IRQs right away, so delay them until we're ready.
+ */
+ writel(0, &oxu->regs->intr_enable);
+
+ /* re-init operational registers */
+ writel(0, &oxu->regs->segment);
+ writel(oxu->periodic_dma, &oxu->regs->frame_list);
+ writel((u32) oxu->async->qh_dma, &oxu->regs->async_next);
+
+ /* restore CMD_RUN, framelist size, and irq threshold */
+ writel(oxu->command, &oxu->regs->command);
+
+ /* Some controller/firmware combinations need a delay during which
+ * they set up the port statuses. See Bugzilla #8190. */
+ mdelay(8);
+
+ /* manually resume the ports we suspended during bus_suspend() */
+ i = HCS_N_PORTS(oxu->hcs_params);
+ while (i--) {
+ temp = readl(&oxu->regs->port_status[i]);
+ temp &= ~(PORT_RWC_BITS
+ | PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E);
+ if (test_bit(i, &oxu->bus_suspended) && (temp & PORT_SUSPEND)) {
+ oxu->reset_done[i] = jiffies + msecs_to_jiffies(20);
+ temp |= PORT_RESUME;
+ }
+ writel(temp, &oxu->regs->port_status[i]);
+ }
+ i = HCS_N_PORTS(oxu->hcs_params);
+ mdelay(20);
+ while (i--) {
+ temp = readl(&oxu->regs->port_status[i]);
+ if (test_bit(i, &oxu->bus_suspended) && (temp & PORT_SUSPEND)) {
+ temp &= ~(PORT_RWC_BITS | PORT_RESUME);
+ writel(temp, &oxu->regs->port_status[i]);
+ oxu_vdbg(oxu, "resumed port %d\n", i + 1);
+ }
+ }
+ (void) readl(&oxu->regs->command);
+
+ /* maybe re-activate the schedule(s) */
+ temp = 0;
+ if (oxu->async->qh_next.qh)
+ temp |= CMD_ASE;
+ if (oxu->periodic_sched)
+ temp |= CMD_PSE;
+ if (temp) {
+ oxu->command |= temp;
+ writel(oxu->command, &oxu->regs->command);
+ }
+
+ oxu->next_statechange = jiffies + msecs_to_jiffies(5);
+ hcd->state = HC_STATE_RUNNING;
+
+ /* Now we can safely re-enable irqs */
+ writel(INTR_MASK, &oxu->regs->intr_enable);
+
+ spin_unlock_irq(&oxu->lock);
+ return 0;
+}
+
+#else
+
+static int oxu_bus_suspend(struct usb_hcd *hcd)
+{
+ return 0;
+}
+
+static int oxu_bus_resume(struct usb_hcd *hcd)
+{
+ return 0;
+}
+
+#endif /* CONFIG_PM */
+
+static const struct hc_driver oxu_hc_driver = {
+ .description = "oxu210hp_hcd",
+ .product_desc = "oxu210hp HCD",
+ .hcd_priv_size = sizeof(struct oxu_hcd),
+
+ /*
+ * Generic hardware linkage
+ */
+ .irq = oxu_irq,
+ .flags = HCD_MEMORY | HCD_USB2,
+
+ /*
+ * Basic lifecycle operations
+ */
+ .reset = oxu_reset,
+ .start = oxu_run,
+ .stop = oxu_stop,
+ .shutdown = oxu_shutdown,
+
+ /*
+ * Managing i/o requests and associated device resources
+ */
+ .urb_enqueue = oxu_urb_enqueue,
+ .urb_dequeue = oxu_urb_dequeue,
+ .endpoint_disable = oxu_endpoint_disable,
+
+ /*
+ * Scheduling support
+ */
+ .get_frame_number = oxu_get_frame,
+
+ /*
+ * Root hub support
+ */
+ .hub_status_data = oxu_hub_status_data,
+ .hub_control = oxu_hub_control,
+ .bus_suspend = oxu_bus_suspend,
+ .bus_resume = oxu_bus_resume,
+};
+
+/*
+ * Module stuff
+ */
+
+static void oxu_configuration(struct platform_device *pdev, void *base)
+{
+ u32 tmp;
+
+ /* Initialize top level registers.
+ * First write ever
+ */
+ oxu_writel(base, OXU_HOSTIFCONFIG, 0x0000037D);
+ oxu_writel(base, OXU_SOFTRESET, OXU_SRESET);
+ oxu_writel(base, OXU_HOSTIFCONFIG, 0x0000037D);
+
+ tmp = oxu_readl(base, OXU_PIOBURSTREADCTRL);
+ oxu_writel(base, OXU_PIOBURSTREADCTRL, tmp | 0x0040);
+
+ oxu_writel(base, OXU_ASO, OXU_SPHPOEN | OXU_OVRCCURPUPDEN |
+ OXU_COMPARATOR | OXU_ASO_OP);
+
+ tmp = oxu_readl(base, OXU_CLKCTRL_SET);
+ oxu_writel(base, OXU_CLKCTRL_SET, tmp | OXU_SYSCLKEN | OXU_USBOTGCLKEN);
+
+ /* Clear all top interrupt enable */
+ oxu_writel(base, OXU_CHIPIRQEN_CLR, 0xff);
+
+ /* Clear all top interrupt status */
+ oxu_writel(base, OXU_CHIPIRQSTATUS, 0xff);
+
+ /* Enable all needed top interrupt except OTG SPH core */
+ oxu_writel(base, OXU_CHIPIRQEN_SET, OXU_USBSPHLPWUI | OXU_USBOTGLPWUI);
+}
+
+static int oxu_verify_id(struct platform_device *pdev, void *base)
+{
+ u32 id;
+ char *bo[] = {
+ "reserved",
+ "128-pin LQFP",
+ "84-pin TFBGA",
+ "reserved",
+ };
+
+ /* Read controller signature register to find a match */
+ id = oxu_readl(base, OXU_DEVICEID);
+ dev_info(&pdev->dev, "device ID %x\n", id);
+ if ((id & OXU_REV_MASK) != (OXU_REV_2100 << OXU_REV_SHIFT))
+ return -1;
+
+ dev_info(&pdev->dev, "found device %x %s (%04x:%04x)\n",
+ id >> OXU_REV_SHIFT,
+ bo[(id & OXU_BO_MASK) >> OXU_BO_SHIFT],
+ (id & OXU_MAJ_REV_MASK) >> OXU_MAJ_REV_SHIFT,
+ (id & OXU_MIN_REV_MASK) >> OXU_MIN_REV_SHIFT);
+
+ return 0;
+}
+
+static const struct hc_driver oxu_hc_driver;
+static struct usb_hcd *oxu_create(struct platform_device *pdev,
+ unsigned long memstart, unsigned long memlen,
+ void *base, int irq, int otg)
+{
+ struct device *dev = &pdev->dev;
+
+ struct usb_hcd *hcd;
+ struct oxu_hcd *oxu;
+ int ret;
+
+ /* Set endian mode and host mode */
+ oxu_writel(base + (otg ? OXU_OTG_CORE_OFFSET : OXU_SPH_CORE_OFFSET),
+ OXU_USBMODE,
+ OXU_CM_HOST_ONLY | OXU_ES_LITTLE | OXU_VBPS);
+
+ hcd = usb_create_hcd(&oxu_hc_driver, dev,
+ otg ? "oxu210hp_otg" : "oxu210hp_sph");
+ if (!hcd)
+ return ERR_PTR(-ENOMEM);
+
+ hcd->rsrc_start = memstart;
+ hcd->rsrc_len = memlen;
+ hcd->regs = base;
+ hcd->irq = irq;
+ hcd->state = HC_STATE_HALT;
+
+ oxu = hcd_to_oxu(hcd);
+ oxu->is_otg = otg;
+
+ ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ return hcd;
+}
+
+static int oxu_init(struct platform_device *pdev,
+ unsigned long memstart, unsigned long memlen,
+ void *base, int irq)
+{
+ struct oxu_info *info = platform_get_drvdata(pdev);
+ struct usb_hcd *hcd;
+ int ret;
+
+ /* First time configuration at start up */
+ oxu_configuration(pdev, base);
+
+ ret = oxu_verify_id(pdev, base);
+ if (ret) {
+ dev_err(&pdev->dev, "no devices found!\n");
+ return -ENODEV;
+ }
+
+ /* Create the OTG controller */
+ hcd = oxu_create(pdev, memstart, memlen, base, irq, 1);
+ if (IS_ERR(hcd)) {
+ dev_err(&pdev->dev, "cannot create OTG controller!\n");
+ ret = PTR_ERR(hcd);
+ goto error_create_otg;
+ }
+ info->hcd[0] = hcd;
+
+ /* Create the SPH host controller */
+ hcd = oxu_create(pdev, memstart, memlen, base, irq, 0);
+ if (IS_ERR(hcd)) {
+ dev_err(&pdev->dev, "cannot create SPH controller!\n");
+ ret = PTR_ERR(hcd);
+ goto error_create_sph;
+ }
+ info->hcd[1] = hcd;
+
+ oxu_writel(base, OXU_CHIPIRQEN_SET,
+ oxu_readl(base, OXU_CHIPIRQEN_SET) | 3);
+
+ return 0;
+
+error_create_sph:
+ usb_remove_hcd(info->hcd[0]);
+ usb_put_hcd(info->hcd[0]);
+
+error_create_otg:
+ return ret;
+}
+
+static int oxu_drv_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ void *base;
+ unsigned long memstart, memlen;
+ int irq, ret;
+ struct oxu_info *info;
+
+ if (usb_disabled())
+ return -ENODEV;
+
+ /*
+ * Get the platform resources
+ */
+ res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (!res) {
+ dev_err(&pdev->dev,
+ "no IRQ! Check %s setup!\n", pdev->dev.bus_id);
+ return -ENODEV;
+ }
+ irq = res->start;
+ dev_dbg(&pdev->dev, "IRQ resource %d\n", irq);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "no registers address! Check %s setup!\n",
+ pdev->dev.bus_id);
+ return -ENODEV;
+ }
+ memstart = res->start;
+ memlen = res->end - res->start + 1;
+ dev_dbg(&pdev->dev, "MEM resource %lx-%lx\n", memstart, memlen);
+ if (!request_mem_region(memstart, memlen,
+ oxu_hc_driver.description)) {
+ dev_dbg(&pdev->dev, "memory area already in use\n");
+ return -EBUSY;
+ }
+
+ ret = set_irq_type(irq, IRQF_TRIGGER_FALLING);
+ if (ret) {
+ dev_err(&pdev->dev, "error setting irq type\n");
+ ret = -EFAULT;
+ goto error_set_irq_type;
+ }
+
+ base = ioremap(memstart, memlen);
+ if (!base) {
+ dev_dbg(&pdev->dev, "error mapping memory\n");
+ ret = -EFAULT;
+ goto error_ioremap;
+ }
+
+ /* Allocate a driver data struct to hold useful info for both
+ * SPH & OTG devices
+ */
+ info = kzalloc(sizeof(struct oxu_info), GFP_KERNEL);
+ if (!info) {
+ dev_dbg(&pdev->dev, "error allocating memory\n");
+ ret = -EFAULT;
+ goto error_alloc;
+ }
+ platform_set_drvdata(pdev, info);
+
+ ret = oxu_init(pdev, memstart, memlen, base, irq);
+ if (ret < 0) {
+ dev_dbg(&pdev->dev, "cannot init USB devices\n");
+ goto error_init;
+ }
+
+ dev_info(&pdev->dev, "devices enabled and running\n");
+ platform_set_drvdata(pdev, info);
+
+ return 0;
+
+error_init:
+ kfree(info);
+ platform_set_drvdata(pdev, NULL);
+
+error_alloc:
+ iounmap(base);
+
+error_set_irq_type:
+error_ioremap:
+ release_mem_region(memstart, memlen);
+
+ dev_err(&pdev->dev, "init %s fail, %d\n", pdev->dev.bus_id, ret);
+ return ret;
+}
+
+static void oxu_remove(struct platform_device *pdev, struct usb_hcd *hcd)
+{
+ usb_remove_hcd(hcd);
+ usb_put_hcd(hcd);
+}
+
+static int oxu_drv_remove(struct platform_device *pdev)
+{
+ struct oxu_info *info = platform_get_drvdata(pdev);
+ unsigned long memstart = info->hcd[0]->rsrc_start,
+ memlen = info->hcd[0]->rsrc_len;
+ void *base = info->hcd[0]->regs;
+
+ oxu_remove(pdev, info->hcd[0]);
+ oxu_remove(pdev, info->hcd[1]);
+
+ iounmap(base);
+ release_mem_region(memstart, memlen);
+
+ kfree(info);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static void oxu_drv_shutdown(struct platform_device *pdev)
+{
+ oxu_drv_remove(pdev);
+}
+
+#if 0
+/* FIXME: TODO */
+static int oxu_drv_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+
+ return 0;
+}
+
+static int oxu_drv_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+
+ return 0;
+}
+#else
+#define oxu_drv_suspend NULL
+#define oxu_drv_resume NULL
+#endif
+
+static struct platform_driver oxu_driver = {
+ .probe = oxu_drv_probe,
+ .remove = oxu_drv_remove,
+ .shutdown = oxu_drv_shutdown,
+ .suspend = oxu_drv_suspend,
+ .resume = oxu_drv_resume,
+ .driver = {
+ .name = "oxu210hp-hcd",
+ .bus = &platform_bus_type
+ }
+};
+
+static int __init oxu_module_init(void)
+{
+ int retval = 0;
+
+ retval = platform_driver_register(&oxu_driver);
+ if (retval < 0)
+ return retval;
+
+ return retval;
+}
+
+static void __exit oxu_module_cleanup(void)
+{
+ platform_driver_unregister(&oxu_driver);
+}
+
+module_init(oxu_module_init);
+module_exit(oxu_module_cleanup);
+
+MODULE_DESCRIPTION("Oxford OXU210HP HCD driver - ver. " DRIVER_VERSION);
+MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
+MODULE_LICENSE("GPL");
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff