+++ /dev/null
-/*
- * esp.c - driver for Hayes ESP serial cards
- *
- * --- Notices from serial.c, upon which this driver is based ---
- *
- * Copyright (C) 1991, 1992 Linus Torvalds
- *
- * Extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92. Now
- * much more extensible to support other serial cards based on the
- * 16450/16550A UART's. Added support for the AST FourPort and the
- * Accent Async board.
- *
- * set_serial_info fixed to set the flags, custom divisor, and uart
- * type fields. Fix suggested by Michael K. Johnson 12/12/92.
- *
- * 11/95: TIOCMIWAIT, TIOCGICOUNT by Angelo Haritsis <ah@doc.ic.ac.uk>
- *
- * 03/96: Modularised by Angelo Haritsis <ah@doc.ic.ac.uk>
- *
- * rs_set_termios fixed to look also for changes of the input
- * flags INPCK, BRKINT, PARMRK, IGNPAR and IGNBRK.
- * Bernd Anhäupl 05/17/96.
- *
- * --- End of notices from serial.c ---
- *
- * Support for the ESP serial card by Andrew J. Robinson
- * <arobinso@nyx.net> (Card detection routine taken from a patch
- * by Dennis J. Boylan). Patches to allow use with 2.1.x contributed
- * by Chris Faylor.
- *
- * Most recent changes: (Andrew J. Robinson)
- * Support for PIO mode. This allows the driver to work properly with
- * multiport cards.
- *
- * Arnaldo Carvalho de Melo <acme@conectiva.com.br> -
- * several cleanups, use module_init/module_exit, etc
- *
- * This module exports the following rs232 io functions:
- *
- * int espserial_init(void);
- */
-
-#include <linux/module.h>
-#include <linux/errno.h>
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/interrupt.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/serial.h>
-#include <linux/serialP.h>
-#include <linux/serial_reg.h>
-#include <linux/major.h>
-#include <linux/string.h>
-#include <linux/fcntl.h>
-#include <linux/ptrace.h>
-#include <linux/ioport.h>
-#include <linux/mm.h>
-#include <linux/init.h>
-#include <linux/delay.h>
-#include <linux/bitops.h>
-
-#include <asm/system.h>
-#include <linux/io.h>
-
-#include <asm/dma.h>
-#include <linux/slab.h>
-#include <linux/uaccess.h>
-
-#include <linux/hayesesp.h>
-
-#define NR_PORTS 64 /* maximum number of ports */
-#define NR_PRIMARY 8 /* maximum number of primary ports */
-#define REGION_SIZE 8 /* size of io region to request */
-
-/* The following variables can be set by giving module options */
-static int irq[NR_PRIMARY]; /* IRQ for each base port */
-static unsigned int divisor[NR_PRIMARY]; /* custom divisor for each port */
-static unsigned int dma = ESP_DMA_CHANNEL; /* DMA channel */
-static unsigned int rx_trigger = ESP_RX_TRIGGER;
-static unsigned int tx_trigger = ESP_TX_TRIGGER;
-static unsigned int flow_off = ESP_FLOW_OFF;
-static unsigned int flow_on = ESP_FLOW_ON;
-static unsigned int rx_timeout = ESP_RX_TMOUT;
-static unsigned int pio_threshold = ESP_PIO_THRESHOLD;
-
-MODULE_LICENSE("GPL");
-
-module_param_array(irq, int, NULL, 0);
-module_param_array(divisor, uint, NULL, 0);
-module_param(dma, uint, 0);
-module_param(rx_trigger, uint, 0);
-module_param(tx_trigger, uint, 0);
-module_param(flow_off, uint, 0);
-module_param(flow_on, uint, 0);
-module_param(rx_timeout, uint, 0);
-module_param(pio_threshold, uint, 0);
-
-/* END */
-
-static char *dma_buffer;
-static int dma_bytes;
-static struct esp_pio_buffer *free_pio_buf;
-
-#define DMA_BUFFER_SZ 1024
-
-#define WAKEUP_CHARS 1024
-
-static char serial_name[] __initdata = "ESP serial driver";
-static char serial_version[] __initdata = "2.2";
-
-static struct tty_driver *esp_driver;
-
-/*
- * Serial driver configuration section. Here are the various options:
- *
- * SERIAL_PARANOIA_CHECK
- * Check the magic number for the esp_structure where
- * ever possible.
- */
-
-#undef SERIAL_PARANOIA_CHECK
-#define SERIAL_DO_RESTART
-
-#undef SERIAL_DEBUG_INTR
-#undef SERIAL_DEBUG_OPEN
-#undef SERIAL_DEBUG_FLOW
-
-#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
-#define DBG_CNT(s) printk(KERN_DEBUG "(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
- tty->name, info->port.flags, \
- serial_driver.refcount, \
- info->port.count, tty->count, s)
-#else
-#define DBG_CNT(s)
-#endif
-
-static struct esp_struct *ports;
-
-static void change_speed(struct esp_struct *info);
-static void rs_wait_until_sent(struct tty_struct *, int);
-
-/*
- * The ESP card has a clock rate of 14.7456 MHz (that is, 2**ESPC_SCALE
- * times the normal 1.8432 Mhz clock of most serial boards).
- */
-#define BASE_BAUD ((1843200 / 16) * (1 << ESPC_SCALE))
-
-/* Standard COM flags (except for COM4, because of the 8514 problem) */
-#define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
-
-static inline int serial_paranoia_check(struct esp_struct *info,
- char *name, const char *routine)
-{
-#ifdef SERIAL_PARANOIA_CHECK
- static const char badmagic[] = KERN_WARNING
- "Warning: bad magic number for serial struct (%s) in %s\n";
- static const char badinfo[] = KERN_WARNING
- "Warning: null esp_struct for (%s) in %s\n";
-
- if (!info) {
- printk(badinfo, name, routine);
- return 1;
- }
- if (info->magic != ESP_MAGIC) {
- printk(badmagic, name, routine);
- return 1;
- }
-#endif
- return 0;
-}
-
-static inline unsigned int serial_in(struct esp_struct *info, int offset)
-{
- return inb(info->io_port + offset);
-}
-
-static inline void serial_out(struct esp_struct *info, int offset,
- unsigned char value)
-{
- outb(value, info->io_port+offset);
-}
-
-/*
- * ------------------------------------------------------------
- * rs_stop() and rs_start()
- *
- * This routines are called before setting or resetting tty->stopped.
- * They enable or disable transmitter interrupts, as necessary.
- * ------------------------------------------------------------
- */
-static void rs_stop(struct tty_struct *tty)
-{
- struct esp_struct *info = tty->driver_data;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->name, "rs_stop"))
- return;
-
- spin_lock_irqsave(&info->lock, flags);
- if (info->IER & UART_IER_THRI) {
- info->IER &= ~UART_IER_THRI;
- serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
- serial_out(info, UART_ESI_CMD2, info->IER);
- }
- spin_unlock_irqrestore(&info->lock, flags);
-}
-
-static void rs_start(struct tty_struct *tty)
-{
- struct esp_struct *info = tty->driver_data;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->name, "rs_start"))
- return;
-
- spin_lock_irqsave(&info->lock, flags);
- if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) {
- info->IER |= UART_IER_THRI;
- serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
- serial_out(info, UART_ESI_CMD2, info->IER);
- }
- spin_unlock_irqrestore(&info->lock, flags);
-}
-
-/*
- * ----------------------------------------------------------------------
- *
- * Here starts the interrupt handling routines. All of the following
- * subroutines are declared as inline and are folded into
- * rs_interrupt(). They were separated out for readability's sake.
- *
- * Note: rs_interrupt() is a "fast" interrupt, which means that it
- * runs with interrupts turned off. People who may want to modify
- * rs_interrupt() should try to keep the interrupt handler as fast as
- * possible. After you are done making modifications, it is not a bad
- * idea to do:
- *
- * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
- *
- * and look at the resulting assemble code in serial.s.
- *
- * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
- * -----------------------------------------------------------------------
- */
-
-static DEFINE_SPINLOCK(pio_lock);
-
-static inline struct esp_pio_buffer *get_pio_buffer(void)
-{
- struct esp_pio_buffer *buf;
- unsigned long flags;
-
- spin_lock_irqsave(&pio_lock, flags);
- if (free_pio_buf) {
- buf = free_pio_buf;
- free_pio_buf = buf->next;
- } else {
- buf = kmalloc(sizeof(struct esp_pio_buffer), GFP_ATOMIC);
- }
- spin_unlock_irqrestore(&pio_lock, flags);
- return buf;
-}
-
-static inline void release_pio_buffer(struct esp_pio_buffer *buf)
-{
- unsigned long flags;
- spin_lock_irqsave(&pio_lock, flags);
- buf->next = free_pio_buf;
- free_pio_buf = buf;
- spin_unlock_irqrestore(&pio_lock, flags);
-}
-
-static inline void receive_chars_pio(struct esp_struct *info, int num_bytes)
-{
- struct tty_struct *tty = info->port.tty;
- int i;
- struct esp_pio_buffer *pio_buf;
- struct esp_pio_buffer *err_buf;
- unsigned char status_mask;
-
- pio_buf = get_pio_buffer();
-
- if (!pio_buf)
- return;
-
- err_buf = get_pio_buffer();
-
- if (!err_buf) {
- release_pio_buffer(pio_buf);
- return;
- }
-
- status_mask = (info->read_status_mask >> 2) & 0x07;
-
- for (i = 0; i < num_bytes - 1; i += 2) {
- *((unsigned short *)(pio_buf->data + i)) =
- inw(info->io_port + UART_ESI_RX);
- err_buf->data[i] = serial_in(info, UART_ESI_RWS);
- err_buf->data[i + 1] = (err_buf->data[i] >> 3) & status_mask;
- err_buf->data[i] &= status_mask;
- }
-
- if (num_bytes & 0x0001) {
- pio_buf->data[num_bytes - 1] = serial_in(info, UART_ESI_RX);
- err_buf->data[num_bytes - 1] =
- (serial_in(info, UART_ESI_RWS) >> 3) & status_mask;
- }
-
- /* make sure everything is still ok since interrupts were enabled */
- tty = info->port.tty;
-
- if (!tty) {
- release_pio_buffer(pio_buf);
- release_pio_buffer(err_buf);
- info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
- return;
- }
-
- status_mask = (info->ignore_status_mask >> 2) & 0x07;
-
- for (i = 0; i < num_bytes; i++) {
- if (!(err_buf->data[i] & status_mask)) {
- int flag = 0;
-
- if (err_buf->data[i] & 0x04) {
- flag = TTY_BREAK;
- if (info->port.flags & ASYNC_SAK)
- do_SAK(tty);
- } else if (err_buf->data[i] & 0x02)
- flag = TTY_FRAME;
- else if (err_buf->data[i] & 0x01)
- flag = TTY_PARITY;
- tty_insert_flip_char(tty, pio_buf->data[i], flag);
- }
- }
-
- tty_schedule_flip(tty);
-
- info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
- release_pio_buffer(pio_buf);
- release_pio_buffer(err_buf);
-}
-
-static void program_isa_dma(int dma, int dir, unsigned long addr, int len)
-{
- unsigned long flags;
-
- flags = claim_dma_lock();
- disable_dma(dma);
- clear_dma_ff(dma);
- set_dma_mode(dma, dir);
- set_dma_addr(dma, addr);
- set_dma_count(dma, len);
- enable_dma(dma);
- release_dma_lock(flags);
-}
-
-static void receive_chars_dma(struct esp_struct *info, int num_bytes)
-{
- info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
- dma_bytes = num_bytes;
- info->stat_flags |= ESP_STAT_DMA_RX;
-
- program_isa_dma(dma, DMA_MODE_READ, isa_virt_to_bus(dma_buffer),
- dma_bytes);
- serial_out(info, UART_ESI_CMD1, ESI_START_DMA_RX);
-}
-
-static inline void receive_chars_dma_done(struct esp_struct *info,
- int status)
-{
- struct tty_struct *tty = info->port.tty;
- int num_bytes;
- unsigned long flags;
-
- flags = claim_dma_lock();
- disable_dma(dma);
- clear_dma_ff(dma);
-
- info->stat_flags &= ~ESP_STAT_DMA_RX;
- num_bytes = dma_bytes - get_dma_residue(dma);
- release_dma_lock(flags);
-
- info->icount.rx += num_bytes;
-
- if (num_bytes > 0) {
- tty_insert_flip_string(tty, dma_buffer, num_bytes - 1);
-
- status &= (0x1c & info->read_status_mask);
-
- /* Is the status significant or do we throw the last byte ? */
- if (!(status & info->ignore_status_mask)) {
- int statflag = 0;
-
- if (status & 0x10) {
- statflag = TTY_BREAK;
- (info->icount.brk)++;
- if (info->port.flags & ASYNC_SAK)
- do_SAK(tty);
- } else if (status & 0x08) {
- statflag = TTY_FRAME;
- info->icount.frame++;
- } else if (status & 0x04) {
- statflag = TTY_PARITY;
- info->icount.parity++;
- }
- tty_insert_flip_char(tty, dma_buffer[num_bytes - 1],
- statflag);
- }
- tty_schedule_flip(tty);
- }
-
- if (dma_bytes != num_bytes) {
- num_bytes = dma_bytes - num_bytes;
- dma_bytes = 0;
- receive_chars_dma(info, num_bytes);
- } else
- dma_bytes = 0;
-}
-
-/* Caller must hold info->lock */
-
-static inline void transmit_chars_pio(struct esp_struct *info,
- int space_avail)
-{
- int i;
- struct esp_pio_buffer *pio_buf;
-
- pio_buf = get_pio_buffer();
-
- if (!pio_buf)
- return;
-
- while (space_avail && info->xmit_cnt) {
- if (info->xmit_tail + space_avail <= ESP_XMIT_SIZE) {
- memcpy(pio_buf->data,
- &(info->xmit_buf[info->xmit_tail]),
- space_avail);
- } else {
- i = ESP_XMIT_SIZE - info->xmit_tail;
- memcpy(pio_buf->data,
- &(info->xmit_buf[info->xmit_tail]), i);
- memcpy(&(pio_buf->data[i]), info->xmit_buf,
- space_avail - i);
- }
-
- info->xmit_cnt -= space_avail;
- info->xmit_tail = (info->xmit_tail + space_avail) &
- (ESP_XMIT_SIZE - 1);
-
- for (i = 0; i < space_avail - 1; i += 2) {
- outw(*((unsigned short *)(pio_buf->data + i)),
- info->io_port + UART_ESI_TX);
- }
-
- if (space_avail & 0x0001)
- serial_out(info, UART_ESI_TX,
- pio_buf->data[space_avail - 1]);
-
- if (info->xmit_cnt) {
- serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
- serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
- space_avail = serial_in(info, UART_ESI_STAT1) << 8;
- space_avail |= serial_in(info, UART_ESI_STAT2);
-
- if (space_avail > info->xmit_cnt)
- space_avail = info->xmit_cnt;
- }
- }
-
- if (info->xmit_cnt < WAKEUP_CHARS) {
- if (info->port.tty)
- tty_wakeup(info->port.tty);
-
-#ifdef SERIAL_DEBUG_INTR
- printk("THRE...");
-#endif
-
- if (info->xmit_cnt <= 0) {
- info->IER &= ~UART_IER_THRI;
- serial_out(info, UART_ESI_CMD1,
- ESI_SET_SRV_MASK);
- serial_out(info, UART_ESI_CMD2, info->IER);
- }
- }
-
- release_pio_buffer(pio_buf);
-}
-
-/* Caller must hold info->lock */
-static inline void transmit_chars_dma(struct esp_struct *info, int num_bytes)
-{
- dma_bytes = num_bytes;
-
- if (info->xmit_tail + dma_bytes <= ESP_XMIT_SIZE) {
- memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
- dma_bytes);
- } else {
- int i = ESP_XMIT_SIZE - info->xmit_tail;
- memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
- i);
- memcpy(&(dma_buffer[i]), info->xmit_buf, dma_bytes - i);
- }
-
- info->xmit_cnt -= dma_bytes;
- info->xmit_tail = (info->xmit_tail + dma_bytes) & (ESP_XMIT_SIZE - 1);
-
- if (info->xmit_cnt < WAKEUP_CHARS) {
- if (info->port.tty)
- tty_wakeup(info->port.tty);
-
-#ifdef SERIAL_DEBUG_INTR
- printk("THRE...");
-#endif
-
- if (info->xmit_cnt <= 0) {
- info->IER &= ~UART_IER_THRI;
- serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
- serial_out(info, UART_ESI_CMD2, info->IER);
- }
- }
-
- info->stat_flags |= ESP_STAT_DMA_TX;
-
- program_isa_dma(dma, DMA_MODE_WRITE, isa_virt_to_bus(dma_buffer),
- dma_bytes);
- serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
-}
-
-static inline void transmit_chars_dma_done(struct esp_struct *info)
-{
- int num_bytes;
- unsigned long flags;
-
- flags = claim_dma_lock();
- disable_dma(dma);
- clear_dma_ff(dma);
-
- num_bytes = dma_bytes - get_dma_residue(dma);
- info->icount.tx += dma_bytes;
- release_dma_lock(flags);
-
- if (dma_bytes != num_bytes) {
- dma_bytes -= num_bytes;
- memmove(dma_buffer, dma_buffer + num_bytes, dma_bytes);
-
- program_isa_dma(dma, DMA_MODE_WRITE,
- isa_virt_to_bus(dma_buffer), dma_bytes);
-
- serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
- } else {
- dma_bytes = 0;
- info->stat_flags &= ~ESP_STAT_DMA_TX;
- }
-}
-
-static void check_modem_status(struct esp_struct *info)
-{
- int status;
-
- serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
- status = serial_in(info, UART_ESI_STAT2);
-
- if (status & UART_MSR_ANY_DELTA) {
- /* update input line counters */
- if (status & UART_MSR_TERI)
- info->icount.rng++;
- if (status & UART_MSR_DDSR)
- info->icount.dsr++;
- if (status & UART_MSR_DDCD)
- info->icount.dcd++;
- if (status & UART_MSR_DCTS)
- info->icount.cts++;
- wake_up_interruptible(&info->port.delta_msr_wait);
- }
-
- if ((info->port.flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
-#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
- printk("ttys%d CD now %s...", info->line,
- (status & UART_MSR_DCD) ? "on" : "off");
-#endif
- if (status & UART_MSR_DCD)
- wake_up_interruptible(&info->port.open_wait);
- else {
-#ifdef SERIAL_DEBUG_OPEN
- printk("scheduling hangup...");
-#endif
- tty_hangup(info->port.tty);
- }
- }
-}
-
-/*
- * This is the serial driver's interrupt routine
- */
-static irqreturn_t rs_interrupt_single(int irq, void *dev_id)
-{
- struct esp_struct *info;
- unsigned err_status;
- unsigned int scratch;
-
-#ifdef SERIAL_DEBUG_INTR
- printk("rs_interrupt_single(%d)...", irq);
-#endif
- info = (struct esp_struct *)dev_id;
- err_status = 0;
- scratch = serial_in(info, UART_ESI_SID);
-
- spin_lock(&info->lock);
-
- if (!info->port.tty) {
- spin_unlock(&info->lock);
- return IRQ_NONE;
- }
-
- if (scratch & 0x04) { /* error */
- serial_out(info, UART_ESI_CMD1, ESI_GET_ERR_STAT);
- err_status = serial_in(info, UART_ESI_STAT1);
- serial_in(info, UART_ESI_STAT2);
-
- if (err_status & 0x01)
- info->stat_flags |= ESP_STAT_RX_TIMEOUT;
-
- if (err_status & 0x20) /* UART status */
- check_modem_status(info);
-
- if (err_status & 0x80) /* Start break */
- wake_up_interruptible(&info->break_wait);
- }
-
- if ((scratch & 0x88) || /* DMA completed or timed out */
- (err_status & 0x1c) /* receive error */) {
- if (info->stat_flags & ESP_STAT_DMA_RX)
- receive_chars_dma_done(info, err_status);
- else if (info->stat_flags & ESP_STAT_DMA_TX)
- transmit_chars_dma_done(info);
- }
-
- if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
- ((scratch & 0x01) || (info->stat_flags & ESP_STAT_RX_TIMEOUT)) &&
- (info->IER & UART_IER_RDI)) {
- int num_bytes;
-
- serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
- serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
- num_bytes = serial_in(info, UART_ESI_STAT1) << 8;
- num_bytes |= serial_in(info, UART_ESI_STAT2);
-
- num_bytes = tty_buffer_request_room(info->port.tty, num_bytes);
-
- if (num_bytes) {
- if (dma_bytes ||
- (info->stat_flags & ESP_STAT_USE_PIO) ||
- (num_bytes <= info->config.pio_threshold))
- receive_chars_pio(info, num_bytes);
- else
- receive_chars_dma(info, num_bytes);
- }
- }
-
- if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
- (scratch & 0x02) && (info->IER & UART_IER_THRI)) {
- if ((info->xmit_cnt <= 0) || info->port.tty->stopped) {
- info->IER &= ~UART_IER_THRI;
- serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
- serial_out(info, UART_ESI_CMD2, info->IER);
- } else {
- int num_bytes;
-
- serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
- serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
- num_bytes = serial_in(info, UART_ESI_STAT1) << 8;
- num_bytes |= serial_in(info, UART_ESI_STAT2);
-
- if (num_bytes > info->xmit_cnt)
- num_bytes = info->xmit_cnt;
-
- if (num_bytes) {
- if (dma_bytes ||
- (info->stat_flags & ESP_STAT_USE_PIO) ||
- (num_bytes <= info->config.pio_threshold))
- transmit_chars_pio(info, num_bytes);
- else
- transmit_chars_dma(info, num_bytes);
- }
- }
- }
-
- info->last_active = jiffies;
-
-#ifdef SERIAL_DEBUG_INTR
- printk("end.\n");
-#endif
- spin_unlock(&info->lock);
- return IRQ_HANDLED;
-}
-
-/*
- * -------------------------------------------------------------------
- * Here ends the serial interrupt routines.
- * -------------------------------------------------------------------
- */
-
-/*
- * ---------------------------------------------------------------
- * Low level utility subroutines for the serial driver: routines to
- * figure out the appropriate timeout for an interrupt chain, routines
- * to initialize and startup a serial port, and routines to shutdown a
- * serial port. Useful stuff like that.
- *
- * Caller should hold lock
- * ---------------------------------------------------------------
- */
-
-static void esp_basic_init(struct esp_struct *info)
-{
- /* put ESPC in enhanced mode */
- serial_out(info, UART_ESI_CMD1, ESI_SET_MODE);
-
- if (info->stat_flags & ESP_STAT_NEVER_DMA)
- serial_out(info, UART_ESI_CMD2, 0x01);
- else
- serial_out(info, UART_ESI_CMD2, 0x31);
-
- /* disable interrupts for now */
- serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
- serial_out(info, UART_ESI_CMD2, 0x00);
-
- /* set interrupt and DMA channel */
- serial_out(info, UART_ESI_CMD1, ESI_SET_IRQ);
-
- if (info->stat_flags & ESP_STAT_NEVER_DMA)
- serial_out(info, UART_ESI_CMD2, 0x01);
- else
- serial_out(info, UART_ESI_CMD2, (dma << 4) | 0x01);
-
- serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
-
- if (info->line % 8) /* secondary port */
- serial_out(info, UART_ESI_CMD2, 0x0d); /* shared */
- else if (info->irq == 9)
- serial_out(info, UART_ESI_CMD2, 0x02);
- else
- serial_out(info, UART_ESI_CMD2, info->irq);
-
- /* set error status mask (check this) */
- serial_out(info, UART_ESI_CMD1, ESI_SET_ERR_MASK);
-
- if (info->stat_flags & ESP_STAT_NEVER_DMA)
- serial_out(info, UART_ESI_CMD2, 0xa1);
- else
- serial_out(info, UART_ESI_CMD2, 0xbd);
-
- serial_out(info, UART_ESI_CMD2, 0x00);
-
- /* set DMA timeout */
- serial_out(info, UART_ESI_CMD1, ESI_SET_DMA_TMOUT);
- serial_out(info, UART_ESI_CMD2, 0xff);
-
- /* set FIFO trigger levels */
- serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
- serial_out(info, UART_ESI_CMD2, info->config.rx_trigger >> 8);
- serial_out(info, UART_ESI_CMD2, info->config.rx_trigger);
- serial_out(info, UART_ESI_CMD2, info->config.tx_trigger >> 8);
- serial_out(info, UART_ESI_CMD2, info->config.tx_trigger);
-
- /* Set clock scaling and wait states */
- serial_out(info, UART_ESI_CMD1, ESI_SET_PRESCALAR);
- serial_out(info, UART_ESI_CMD2, 0x04 | ESPC_SCALE);
-
- /* set reinterrupt pacing */
- serial_out(info, UART_ESI_CMD1, ESI_SET_REINTR);
- serial_out(info, UART_ESI_CMD2, 0xff);
-}
-
-static int startup(struct esp_struct *info)
-{
- unsigned long flags;
- int retval = 0;
- unsigned int num_chars;
-
- spin_lock_irqsave(&info->lock, flags);
-
- if (info->port.flags & ASYNC_INITIALIZED)
- goto out;
-
- if (!info->xmit_buf) {
- info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_ATOMIC);
- retval = -ENOMEM;
- if (!info->xmit_buf)
- goto out;
- }
-
-#ifdef SERIAL_DEBUG_OPEN
- printk(KERN_DEBUG "starting up ttys%d (irq %d)...",
- info->line, info->irq);
-#endif
-
- /* Flush the RX buffer. Using the ESI flush command may cause */
- /* wild interrupts, so read all the data instead. */
-
- serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
- serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
- num_chars = serial_in(info, UART_ESI_STAT1) << 8;
- num_chars |= serial_in(info, UART_ESI_STAT2);
-
- while (num_chars > 1) {
- inw(info->io_port + UART_ESI_RX);
- num_chars -= 2;
- }
-
- if (num_chars)
- serial_in(info, UART_ESI_RX);
-
- /* set receive character timeout */
- serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
- serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
-
- /* clear all flags except the "never DMA" flag */
- info->stat_flags &= ESP_STAT_NEVER_DMA;
-
- if (info->stat_flags & ESP_STAT_NEVER_DMA)
- info->stat_flags |= ESP_STAT_USE_PIO;
-
- spin_unlock_irqrestore(&info->lock, flags);
-
- /*
- * Allocate the IRQ
- */
-
- retval = request_irq(info->irq, rs_interrupt_single, IRQF_SHARED,
- "esp serial", info);
-
- if (retval) {
- if (capable(CAP_SYS_ADMIN)) {
- if (info->port.tty)
- set_bit(TTY_IO_ERROR,
- &info->port.tty->flags);
- retval = 0;
- }
- goto out_unlocked;
- }
-
- if (!(info->stat_flags & ESP_STAT_USE_PIO) && !dma_buffer) {
- dma_buffer = (char *)__get_dma_pages(
- GFP_KERNEL, get_order(DMA_BUFFER_SZ));
-
- /* use PIO mode if DMA buf/chan cannot be allocated */
- if (!dma_buffer)
- info->stat_flags |= ESP_STAT_USE_PIO;
- else if (request_dma(dma, "esp serial")) {
- free_pages((unsigned long)dma_buffer,
- get_order(DMA_BUFFER_SZ));
- dma_buffer = NULL;
- info->stat_flags |= ESP_STAT_USE_PIO;
- }
-
- }
-
- info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
-
- spin_lock_irqsave(&info->lock, flags);
- serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
- serial_out(info, UART_ESI_CMD2, UART_MCR);
- serial_out(info, UART_ESI_CMD2, info->MCR);
-
- /*
- * Finally, enable interrupts
- */
- /* info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; */
- info->IER = UART_IER_RLSI | UART_IER_RDI | UART_IER_DMA_TMOUT |
- UART_IER_DMA_TC;
- serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
- serial_out(info, UART_ESI_CMD2, info->IER);
-
- if (info->port.tty)
- clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
- info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
- spin_unlock_irqrestore(&info->lock, flags);
-
- /*
- * Set up the tty->alt_speed kludge
- */
- if (info->port.tty) {
- if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
- info->port.tty->alt_speed = 57600;
- if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
- info->port.tty->alt_speed = 115200;
- if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
- info->port.tty->alt_speed = 230400;
- if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
- info->port.tty->alt_speed = 460800;
- }
-
- /*
- * set the speed of the serial port
- */
- change_speed(info);
- info->port.flags |= ASYNC_INITIALIZED;
- return 0;
-
-out:
- spin_unlock_irqrestore(&info->lock, flags);
-out_unlocked:
- return retval;
-}
-
-/*
- * This routine will shutdown a serial port; interrupts are disabled, and
- * DTR is dropped if the hangup on close termio flag is on.
- */
-static void shutdown(struct esp_struct *info)
-{
- unsigned long flags, f;
-
- if (!(info->port.flags & ASYNC_INITIALIZED))
- return;
-
-#ifdef SERIAL_DEBUG_OPEN
- printk("Shutting down serial port %d (irq %d)....", info->line,
- info->irq);
-#endif
-
- spin_lock_irqsave(&info->lock, flags);
- /*
- * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
- * here so the queue might never be waken up
- */
- wake_up_interruptible(&info->port.delta_msr_wait);
- wake_up_interruptible(&info->break_wait);
-
- /* stop a DMA transfer on the port being closed */
- /* DMA lock is higher priority always */
- if (info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) {
- f = claim_dma_lock();
- disable_dma(dma);
- clear_dma_ff(dma);
- release_dma_lock(f);
-
- dma_bytes = 0;
- }
-
- /*
- * Free the IRQ
- */
- free_irq(info->irq, info);
-
- if (dma_buffer) {
- struct esp_struct *current_port = ports;
-
- while (current_port) {
- if ((current_port != info) &&
- (current_port->port.flags & ASYNC_INITIALIZED))
- break;
-
- current_port = current_port->next_port;
- }
-
- if (!current_port) {
- free_dma(dma);
- free_pages((unsigned long)dma_buffer,
- get_order(DMA_BUFFER_SZ));
- dma_buffer = NULL;
- }
- }
-
- if (info->xmit_buf) {
- free_page((unsigned long) info->xmit_buf);
- info->xmit_buf = NULL;
- }
-
- info->IER = 0;
- serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
- serial_out(info, UART_ESI_CMD2, 0x00);
-
- if (!info->port.tty || (info->port.tty->termios->c_cflag & HUPCL))
- info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
-
- info->MCR &= ~UART_MCR_OUT2;
- serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
- serial_out(info, UART_ESI_CMD2, UART_MCR);
- serial_out(info, UART_ESI_CMD2, info->MCR);
-
- if (info->port.tty)
- set_bit(TTY_IO_ERROR, &info->port.tty->flags);
-
- info->port.flags &= ~ASYNC_INITIALIZED;
- spin_unlock_irqrestore(&info->lock, flags);
-}
-
-/*
- * This routine is called to set the UART divisor registers to match
- * the specified baud rate for a serial port.
- */
-static void change_speed(struct esp_struct *info)
-{
- unsigned short port;
- int quot = 0;
- unsigned cflag, cval;
- int baud, bits;
- unsigned char flow1 = 0, flow2 = 0;
- unsigned long flags;
-
- if (!info->port.tty || !info->port.tty->termios)
- return;
- cflag = info->port.tty->termios->c_cflag;
- port = info->io_port;
-
- /* byte size and parity */
- switch (cflag & CSIZE) {
- case CS5: cval = 0x00; bits = 7; break;
- case CS6: cval = 0x01; bits = 8; break;
- case CS7: cval = 0x02; bits = 9; break;
- case CS8: cval = 0x03; bits = 10; break;
- default: cval = 0x00; bits = 7; break;
- }
- if (cflag & CSTOPB) {
- cval |= 0x04;
- bits++;
- }
- if (cflag & PARENB) {
- cval |= UART_LCR_PARITY;
- bits++;
- }
- if (!(cflag & PARODD))
- cval |= UART_LCR_EPAR;
-#ifdef CMSPAR
- if (cflag & CMSPAR)
- cval |= UART_LCR_SPAR;
-#endif
- baud = tty_get_baud_rate(info->port.tty);
- if (baud == 38400 &&
- ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
- quot = info->custom_divisor;
- else {
- if (baud == 134) /* Special case since 134 is really 134.5 */
- quot = (2*BASE_BAUD / 269);
- else if (baud)
- quot = BASE_BAUD / baud;
- }
- /* If the quotient is ever zero, default to 9600 bps */
- if (!quot)
- quot = BASE_BAUD / 9600;
-
- if (baud) {
- /* Actual rate */
- baud = BASE_BAUD/quot;
- tty_encode_baud_rate(info->port.tty, baud, baud);
- }
- info->timeout = ((1024 * HZ * bits * quot) / BASE_BAUD) + (HZ / 50);
-
- /* CTS flow control flag and modem status interrupts */
- /* info->IER &= ~UART_IER_MSI; */
- if (cflag & CRTSCTS) {
- info->port.flags |= ASYNC_CTS_FLOW;
- /* info->IER |= UART_IER_MSI; */
- flow1 = 0x04;
- flow2 = 0x10;
- } else
- info->port.flags &= ~ASYNC_CTS_FLOW;
- if (cflag & CLOCAL)
- info->port.flags &= ~ASYNC_CHECK_CD;
- else
- info->port.flags |= ASYNC_CHECK_CD;
-
- /*
- * Set up parity check flag
- */
- info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
- if (I_INPCK(info->port.tty))
- info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
- if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
- info->read_status_mask |= UART_LSR_BI;
-
- info->ignore_status_mask = 0;
-#if 0
- /* This should be safe, but for some broken bits of hardware... */
- if (I_IGNPAR(info->port.tty)) {
- info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
- info->read_status_mask |= UART_LSR_PE | UART_LSR_FE;
- }
-#endif
- if (I_IGNBRK(info->port.tty)) {
- info->ignore_status_mask |= UART_LSR_BI;
- info->read_status_mask |= UART_LSR_BI;
- /*
- * If we're ignore parity and break indicators, ignore
- * overruns too. (For real raw support).
- */
- if (I_IGNPAR(info->port.tty)) {
- info->ignore_status_mask |= UART_LSR_OE | \
- UART_LSR_PE | UART_LSR_FE;
- info->read_status_mask |= UART_LSR_OE | \
- UART_LSR_PE | UART_LSR_FE;
- }
- }
-
- if (I_IXOFF(info->port.tty))
- flow1 |= 0x81;
-
- spin_lock_irqsave(&info->lock, flags);
- /* set baud */
- serial_out(info, UART_ESI_CMD1, ESI_SET_BAUD);
- serial_out(info, UART_ESI_CMD2, quot >> 8);
- serial_out(info, UART_ESI_CMD2, quot & 0xff);
-
- /* set data bits, parity, etc. */
- serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
- serial_out(info, UART_ESI_CMD2, UART_LCR);
- serial_out(info, UART_ESI_CMD2, cval);
-
- /* Enable flow control */
- serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CNTL);
- serial_out(info, UART_ESI_CMD2, flow1);
- serial_out(info, UART_ESI_CMD2, flow2);
-
- /* set flow control characters (XON/XOFF only) */
- if (I_IXOFF(info->port.tty)) {
- serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CHARS);
- serial_out(info, UART_ESI_CMD2, START_CHAR(info->port.tty));
- serial_out(info, UART_ESI_CMD2, STOP_CHAR(info->port.tty));
- serial_out(info, UART_ESI_CMD2, 0x10);
- serial_out(info, UART_ESI_CMD2, 0x21);
- switch (cflag & CSIZE) {
- case CS5:
- serial_out(info, UART_ESI_CMD2, 0x1f);
- break;
- case CS6:
- serial_out(info, UART_ESI_CMD2, 0x3f);
- break;
- case CS7:
- case CS8:
- serial_out(info, UART_ESI_CMD2, 0x7f);
- break;
- default:
- serial_out(info, UART_ESI_CMD2, 0xff);
- break;
- }
- }
-
- /* Set high/low water */
- serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
- serial_out(info, UART_ESI_CMD2, info->config.flow_off >> 8);
- serial_out(info, UART_ESI_CMD2, info->config.flow_off);
- serial_out(info, UART_ESI_CMD2, info->config.flow_on >> 8);
- serial_out(info, UART_ESI_CMD2, info->config.flow_on);
-
- spin_unlock_irqrestore(&info->lock, flags);
-}
-
-static int rs_put_char(struct tty_struct *tty, unsigned char ch)
-{
- struct esp_struct *info = tty->driver_data;
- unsigned long flags;
- int ret = 0;
-
- if (serial_paranoia_check(info, tty->name, "rs_put_char"))
- return 0;
-
- if (!info->xmit_buf)
- return 0;
-
- spin_lock_irqsave(&info->lock, flags);
- if (info->xmit_cnt < ESP_XMIT_SIZE - 1) {
- info->xmit_buf[info->xmit_head++] = ch;
- info->xmit_head &= ESP_XMIT_SIZE-1;
- info->xmit_cnt++;
- ret = 1;
- }
- spin_unlock_irqrestore(&info->lock, flags);
- return ret;
-}
-
-static void rs_flush_chars(struct tty_struct *tty)
-{
- struct esp_struct *info = tty->driver_data;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
- return;
-
- spin_lock_irqsave(&info->lock, flags);
-
- if (info->xmit_cnt <= 0 || tty->stopped || !info->xmit_buf)
- goto out;
-
- if (!(info->IER & UART_IER_THRI)) {
- info->IER |= UART_IER_THRI;
- serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
- serial_out(info, UART_ESI_CMD2, info->IER);
- }
-out:
- spin_unlock_irqrestore(&info->lock, flags);
-}
-
-static int rs_write(struct tty_struct *tty,
- const unsigned char *buf, int count)
-{
- int c, t, ret = 0;
- struct esp_struct *info = tty->driver_data;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->name, "rs_write"))
- return 0;
-
- if (!info->xmit_buf)
- return 0;
-
- while (1) {
- /* Thanks to R. Wolff for suggesting how to do this with */
- /* interrupts enabled */
-
- c = count;
- t = ESP_XMIT_SIZE - info->xmit_cnt - 1;
-
- if (t < c)
- c = t;
-
- t = ESP_XMIT_SIZE - info->xmit_head;
-
- if (t < c)
- c = t;
-
- if (c <= 0)
- break;
-
- memcpy(info->xmit_buf + info->xmit_head, buf, c);
-
- info->xmit_head = (info->xmit_head + c) & (ESP_XMIT_SIZE-1);
- info->xmit_cnt += c;
- buf += c;
- count -= c;
- ret += c;
- }
-
- spin_lock_irqsave(&info->lock, flags);
-
- if (info->xmit_cnt && !tty->stopped && !(info->IER & UART_IER_THRI)) {
- info->IER |= UART_IER_THRI;
- serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
- serial_out(info, UART_ESI_CMD2, info->IER);
- }
-
- spin_unlock_irqrestore(&info->lock, flags);
- return ret;
-}
-
-static int rs_write_room(struct tty_struct *tty)
-{
- struct esp_struct *info = tty->driver_data;
- int ret;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->name, "rs_write_room"))
- return 0;
-
- spin_lock_irqsave(&info->lock, flags);
-
- ret = ESP_XMIT_SIZE - info->xmit_cnt - 1;
- if (ret < 0)
- ret = 0;
- spin_unlock_irqrestore(&info->lock, flags);
- return ret;
-}
-
-static int rs_chars_in_buffer(struct tty_struct *tty)
-{
- struct esp_struct *info = tty->driver_data;
-
- if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
- return 0;
- return info->xmit_cnt;
-}
-
-static void rs_flush_buffer(struct tty_struct *tty)
-{
- struct esp_struct *info = tty->driver_data;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
- return;
- spin_lock_irqsave(&info->lock, flags);
- info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
- spin_unlock_irqrestore(&info->lock, flags);
- tty_wakeup(tty);
-}
-
-/*
- * ------------------------------------------------------------
- * rs_throttle()
- *
- * This routine is called by the upper-layer tty layer to signal that
- * incoming characters should be throttled.
- * ------------------------------------------------------------
- */
-static void rs_throttle(struct tty_struct *tty)
-{
- struct esp_struct *info = tty->driver_data;
- unsigned long flags;
-#ifdef SERIAL_DEBUG_THROTTLE
- char buf[64];
-
- printk("throttle %s: %d....\n", tty_name(tty, buf),
- tty_chars_in_buffer(tty));
-#endif
-
- if (serial_paranoia_check(info, tty->name, "rs_throttle"))
- return;
-
- spin_lock_irqsave(&info->lock, flags);
- info->IER &= ~UART_IER_RDI;
- serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
- serial_out(info, UART_ESI_CMD2, info->IER);
- serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
- serial_out(info, UART_ESI_CMD2, 0x00);
- spin_unlock_irqrestore(&info->lock, flags);
-}
-
-static void rs_unthrottle(struct tty_struct *tty)
-{
- struct esp_struct *info = tty->driver_data;
- unsigned long flags;
-#ifdef SERIAL_DEBUG_THROTTLE
- char buf[64];
-
- printk(KERN_DEBUG "unthrottle %s: %d....\n", tty_name(tty, buf),
- tty_chars_in_buffer(tty));
-#endif
-
- if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
- return;
-
- spin_lock_irqsave(&info->lock, flags);
- info->IER |= UART_IER_RDI;
- serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
- serial_out(info, UART_ESI_CMD2, info->IER);
- serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
- serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
- spin_unlock_irqrestore(&info->lock, flags);
-}
-
-/*
- * ------------------------------------------------------------
- * rs_ioctl() and friends
- * ------------------------------------------------------------
- */
-
-static int get_serial_info(struct esp_struct *info,
- struct serial_struct __user *retinfo)
-{
- struct serial_struct tmp;
-
- lock_kernel();
- memset(&tmp, 0, sizeof(tmp));
- tmp.type = PORT_16550A;
- tmp.line = info->line;
- tmp.port = info->io_port;
- tmp.irq = info->irq;
- tmp.flags = info->port.flags;
- tmp.xmit_fifo_size = 1024;
- tmp.baud_base = BASE_BAUD;
- tmp.close_delay = info->close_delay;
- tmp.closing_wait = info->closing_wait;
- tmp.custom_divisor = info->custom_divisor;
- tmp.hub6 = 0;
- unlock_kernel();
- if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
- return -EFAULT;
- return 0;
-}
-
-static int get_esp_config(struct esp_struct *info,
- struct hayes_esp_config __user *retinfo)
-{
- struct hayes_esp_config tmp;
-
- if (!retinfo)
- return -EFAULT;
-
- memset(&tmp, 0, sizeof(tmp));
- lock_kernel();
- tmp.rx_timeout = info->config.rx_timeout;
- tmp.rx_trigger = info->config.rx_trigger;
- tmp.tx_trigger = info->config.tx_trigger;
- tmp.flow_off = info->config.flow_off;
- tmp.flow_on = info->config.flow_on;
- tmp.pio_threshold = info->config.pio_threshold;
- tmp.dma_channel = (info->stat_flags & ESP_STAT_NEVER_DMA ? 0 : dma);
- unlock_kernel();
-
- return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
-}
-
-static int set_serial_info(struct esp_struct *info,
- struct serial_struct __user *new_info)
-{
- struct serial_struct new_serial;
- struct esp_struct old_info;
- unsigned int change_irq;
- int retval = 0;
- struct esp_struct *current_async;
-
- if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
- return -EFAULT;
- old_info = *info;
-
- if ((new_serial.type != PORT_16550A) ||
- (new_serial.hub6) ||
- (info->io_port != new_serial.port) ||
- (new_serial.baud_base != BASE_BAUD) ||
- (new_serial.irq > 15) ||
- (new_serial.irq < 2) ||
- (new_serial.irq == 6) ||
- (new_serial.irq == 8) ||
- (new_serial.irq == 13))
- return -EINVAL;
-
- change_irq = new_serial.irq != info->irq;
-
- if (change_irq && (info->line % 8))
- return -EINVAL;
-
- if (!capable(CAP_SYS_ADMIN)) {
- if (change_irq ||
- (new_serial.close_delay != info->close_delay) ||
- ((new_serial.flags & ~ASYNC_USR_MASK) !=
- (info->port.flags & ~ASYNC_USR_MASK)))
- return -EPERM;
- info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
- (new_serial.flags & ASYNC_USR_MASK));
- info->custom_divisor = new_serial.custom_divisor;
- } else {
- if (new_serial.irq == 2)
- new_serial.irq = 9;
-
- if (change_irq) {
- current_async = ports;
-
- while (current_async) {
- if ((current_async->line >= info->line) &&
- (current_async->line < (info->line + 8))) {
- if (current_async == info) {
- if (current_async->port.count > 1)
- return -EBUSY;
- } else if (current_async->port.count)
- return -EBUSY;
- }
-
- current_async = current_async->next_port;
- }
- }
-
- /*
- * OK, past this point, all the error checking has been done.
- * At this point, we start making changes.....
- */
-
- info->port.flags = ((info->port.flags & ~ASYNC_FLAGS) |
- (new_serial.flags & ASYNC_FLAGS));
- info->custom_divisor = new_serial.custom_divisor;
- info->close_delay = new_serial.close_delay * HZ/100;
- info->closing_wait = new_serial.closing_wait * HZ/100;
-
- if (change_irq) {
- /*
- * We need to shutdown the serial port at the old
- * port/irq combination.
- */
- shutdown(info);
-
- current_async = ports;
-
- while (current_async) {
- if ((current_async->line >= info->line) &&
- (current_async->line < (info->line + 8)))
- current_async->irq = new_serial.irq;
-
- current_async = current_async->next_port;
- }
-
- serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
- if (info->irq == 9)
- serial_out(info, UART_ESI_CMD2, 0x02);
- else
- serial_out(info, UART_ESI_CMD2, info->irq);
- }
- }
-
- if (info->port.flags & ASYNC_INITIALIZED) {
- if (((old_info.port.flags & ASYNC_SPD_MASK) !=
- (info->port.flags & ASYNC_SPD_MASK)) ||
- (old_info.custom_divisor != info->custom_divisor)) {
- if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
- info->port.tty->alt_speed = 57600;
- if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
- info->port.tty->alt_speed = 115200;
- if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
- info->port.tty->alt_speed = 230400;
- if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
- info->port.tty->alt_speed = 460800;
- change_speed(info);
- }
- } else
- retval = startup(info);
-
- return retval;
-}
-
-static int set_esp_config(struct esp_struct *info,
- struct hayes_esp_config __user *new_info)
-{
- struct hayes_esp_config new_config;
- unsigned int change_dma;
- int retval = 0;
- struct esp_struct *current_async;
- unsigned long flags;
-
- /* Perhaps a non-sysadmin user should be able to do some of these */
- /* operations. I haven't decided yet. */
-
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- if (copy_from_user(&new_config, new_info, sizeof(new_config)))
- return -EFAULT;
-
- if ((new_config.flow_on >= new_config.flow_off) ||
- (new_config.rx_trigger < 1) ||
- (new_config.tx_trigger < 1) ||
- (new_config.flow_off < 1) ||
- (new_config.flow_on < 1) ||
- (new_config.rx_trigger > 1023) ||
- (new_config.tx_trigger > 1023) ||
- (new_config.flow_off > 1023) ||
- (new_config.flow_on > 1023) ||
- (new_config.pio_threshold < 0) ||
- (new_config.pio_threshold > 1024))
- return -EINVAL;
-
- if ((new_config.dma_channel != 1) && (new_config.dma_channel != 3))
- new_config.dma_channel = 0;
-
- if (info->stat_flags & ESP_STAT_NEVER_DMA)
- change_dma = new_config.dma_channel;
- else
- change_dma = (new_config.dma_channel != dma);
-
- if (change_dma) {
- if (new_config.dma_channel) {
- /* PIO mode to DMA mode transition OR */
- /* change current DMA channel */
- current_async = ports;
-
- while (current_async) {
- if (current_async == info) {
- if (current_async->port.count > 1)
- return -EBUSY;
- } else if (current_async->port.count)
- return -EBUSY;
-
- current_async = current_async->next_port;
- }
-
- shutdown(info);
- dma = new_config.dma_channel;
- info->stat_flags &= ~ESP_STAT_NEVER_DMA;
-
- /* all ports must use the same DMA channel */
-
- spin_lock_irqsave(&info->lock, flags);
- current_async = ports;
-
- while (current_async) {
- esp_basic_init(current_async);
- current_async = current_async->next_port;
- }
- spin_unlock_irqrestore(&info->lock, flags);
- } else {
- /* DMA mode to PIO mode only */
- if (info->port.count > 1)
- return -EBUSY;
-
- shutdown(info);
- spin_lock_irqsave(&info->lock, flags);
- info->stat_flags |= ESP_STAT_NEVER_DMA;
- esp_basic_init(info);
- spin_unlock_irqrestore(&info->lock, flags);
- }
- }
-
- info->config.pio_threshold = new_config.pio_threshold;
-
- if ((new_config.flow_off != info->config.flow_off) ||
- (new_config.flow_on != info->config.flow_on)) {
- info->config.flow_off = new_config.flow_off;
- info->config.flow_on = new_config.flow_on;
-
- spin_lock_irqsave(&info->lock, flags);
- serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
- serial_out(info, UART_ESI_CMD2, new_config.flow_off >> 8);
- serial_out(info, UART_ESI_CMD2, new_config.flow_off);
- serial_out(info, UART_ESI_CMD2, new_config.flow_on >> 8);
- serial_out(info, UART_ESI_CMD2, new_config.flow_on);
- spin_unlock_irqrestore(&info->lock, flags);
- }
-
- if ((new_config.rx_trigger != info->config.rx_trigger) ||
- (new_config.tx_trigger != info->config.tx_trigger)) {
- info->config.rx_trigger = new_config.rx_trigger;
- info->config.tx_trigger = new_config.tx_trigger;
- spin_lock_irqsave(&info->lock, flags);
- serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
- serial_out(info, UART_ESI_CMD2,
- new_config.rx_trigger >> 8);
- serial_out(info, UART_ESI_CMD2, new_config.rx_trigger);
- serial_out(info, UART_ESI_CMD2,
- new_config.tx_trigger >> 8);
- serial_out(info, UART_ESI_CMD2, new_config.tx_trigger);
- spin_unlock_irqrestore(&info->lock, flags);
- }
-
- if (new_config.rx_timeout != info->config.rx_timeout) {
- info->config.rx_timeout = new_config.rx_timeout;
- spin_lock_irqsave(&info->lock, flags);
-
- if (info->IER & UART_IER_RDI) {
- serial_out(info, UART_ESI_CMD1,
- ESI_SET_RX_TIMEOUT);
- serial_out(info, UART_ESI_CMD2,
- new_config.rx_timeout);
- }
-
- spin_unlock_irqrestore(&info->lock, flags);
- }
-
- if (!(info->port.flags & ASYNC_INITIALIZED))
- retval = startup(info);
-
- return retval;
-}
-
-/*
- * get_lsr_info - get line status register info
- *
- * Purpose: Let user call ioctl() to get info when the UART physically
- * is emptied. On bus types like RS485, the transmitter must
- * release the bus after transmitting. This must be done when
- * the transmit shift register is empty, not be done when the
- * transmit holding register is empty. This functionality
- * allows an RS485 driver to be written in user space.
- */
-static int get_lsr_info(struct esp_struct *info, unsigned int __user *value)
-{
- unsigned char status;
- unsigned int result;
- unsigned long flags;
-
- spin_lock_irqsave(&info->lock, flags);
- serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
- status = serial_in(info, UART_ESI_STAT1);
- spin_unlock_irqrestore(&info->lock, flags);
- result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
- return put_user(result, value);
-}
-
-
-static int esp_tiocmget(struct tty_struct *tty, struct file *file)
-{
- struct esp_struct *info = tty->driver_data;
- unsigned char control, status;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->name, __func__))
- return -ENODEV;
- if (tty->flags & (1 << TTY_IO_ERROR))
- return -EIO;
-
- control = info->MCR;
-
- spin_lock_irqsave(&info->lock, flags);
- serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
- status = serial_in(info, UART_ESI_STAT2);
- spin_unlock_irqrestore(&info->lock, flags);
-
- return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
- | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
- | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0)
- | ((status & UART_MSR_RI) ? TIOCM_RNG : 0)
- | ((status & UART_MSR_DSR) ? TIOCM_DSR : 0)
- | ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
-}
-
-static int esp_tiocmset(struct tty_struct *tty, struct file *file,
- unsigned int set, unsigned int clear)
-{
- struct esp_struct *info = tty->driver_data;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->name, __func__))
- return -ENODEV;
- if (tty->flags & (1 << TTY_IO_ERROR))
- return -EIO;
-
- spin_lock_irqsave(&info->lock, flags);
-
- if (set & TIOCM_RTS)
- info->MCR |= UART_MCR_RTS;
- if (set & TIOCM_DTR)
- info->MCR |= UART_MCR_DTR;
-
- if (clear & TIOCM_RTS)
- info->MCR &= ~UART_MCR_RTS;
- if (clear & TIOCM_DTR)
- info->MCR &= ~UART_MCR_DTR;
-
- serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
- serial_out(info, UART_ESI_CMD2, UART_MCR);
- serial_out(info, UART_ESI_CMD2, info->MCR);
-
- spin_unlock_irqrestore(&info->lock, flags);
- return 0;
-}
-
-/*
- * rs_break() --- routine which turns the break handling on or off
- */
-static int esp_break(struct tty_struct *tty, int break_state)
-{
- struct esp_struct *info = tty->driver_data;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->name, "esp_break"))
- return -EINVAL;
-
- if (break_state == -1) {
- spin_lock_irqsave(&info->lock, flags);
- serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
- serial_out(info, UART_ESI_CMD2, 0x01);
- spin_unlock_irqrestore(&info->lock, flags);
-
- /* FIXME - new style wait needed here */
- interruptible_sleep_on(&info->break_wait);
- } else {
- spin_lock_irqsave(&info->lock, flags);
- serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
- serial_out(info, UART_ESI_CMD2, 0x00);
- spin_unlock_irqrestore(&info->lock, flags);
- }
- return 0;
-}
-
-static int rs_ioctl(struct tty_struct *tty, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- struct esp_struct *info = tty->driver_data;
- struct async_icount cprev, cnow; /* kernel counter temps */
- struct serial_icounter_struct __user *p_cuser; /* user space */
- void __user *argp = (void __user *)arg;
- unsigned long flags;
- int ret;
-
- if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
- return -ENODEV;
-
- if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
- (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
- (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT) &&
- (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT) &&
- (cmd != TIOCGHAYESESP) && (cmd != TIOCSHAYESESP)) {
- if (tty->flags & (1 << TTY_IO_ERROR))
- return -EIO;
- }
-
- switch (cmd) {
- case TIOCGSERIAL:
- return get_serial_info(info, argp);
- case TIOCSSERIAL:
- lock_kernel();
- ret = set_serial_info(info, argp);
- unlock_kernel();
- return ret;
- case TIOCSERGWILD:
- return put_user(0L, (unsigned long __user *)argp);
- case TIOCSERGETLSR: /* Get line status register */
- return get_lsr_info(info, argp);
- case TIOCSERSWILD:
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
- return 0;
- /*
- * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
- * - mask passed in arg for lines of interest
- * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
- * Caller should use TIOCGICOUNT to see which one it was
- */
- case TIOCMIWAIT:
- spin_lock_irqsave(&info->lock, flags);
- cprev = info->icount; /* note the counters on entry */
- spin_unlock_irqrestore(&info->lock, flags);
- while (1) {
- /* FIXME: convert to new style wakeup */
- interruptible_sleep_on(&info->port.delta_msr_wait);
- /* see if a signal did it */
- if (signal_pending(current))
- return -ERESTARTSYS;
- spin_lock_irqsave(&info->lock, flags);
- cnow = info->icount; /* atomic copy */
- spin_unlock_irqrestore(&info->lock, flags);
- if (cnow.rng == cprev.rng &&
- cnow.dsr == cprev.dsr &&
- cnow.dcd == cprev.dcd &&
- cnow.cts == cprev.cts)
- return -EIO; /* no change => error */
- if (((arg & TIOCM_RNG) &&
- (cnow.rng != cprev.rng)) ||
- ((arg & TIOCM_DSR) &&
- (cnow.dsr != cprev.dsr)) ||
- ((arg & TIOCM_CD) &&
- (cnow.dcd != cprev.dcd)) ||
- ((arg & TIOCM_CTS) &&
- (cnow.cts != cprev.cts))) {
- return 0;
- }
- cprev = cnow;
- }
- /* NOTREACHED */
- /*
- * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
- * Return: write counters to the user passed counter struct
- * NB: both 1->0 and 0->1 transitions are counted except for
- * RI where only 0->1 is counted.
- */
- case TIOCGICOUNT:
- spin_lock_irqsave(&info->lock, flags);
- cnow = info->icount;
- spin_unlock_irqrestore(&info->lock, flags);
- p_cuser = argp;
- if (put_user(cnow.cts, &p_cuser->cts) ||
- put_user(cnow.dsr, &p_cuser->dsr) ||
- put_user(cnow.rng, &p_cuser->rng) ||
- put_user(cnow.dcd, &p_cuser->dcd))
- return -EFAULT;
- return 0;
- case TIOCGHAYESESP:
- return get_esp_config(info, argp);
- case TIOCSHAYESESP:
- lock_kernel();
- ret = set_esp_config(info, argp);
- unlock_kernel();
- return ret;
- default:
- return -ENOIOCTLCMD;
- }
- return 0;
-}
-
-static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
-{
- struct esp_struct *info = tty->driver_data;
- unsigned long flags;
-
- change_speed(info);
-
- spin_lock_irqsave(&info->lock, flags);
-
- /* Handle transition to B0 status */
- if ((old_termios->c_cflag & CBAUD) &&
- !(tty->termios->c_cflag & CBAUD)) {
- info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
- serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
- serial_out(info, UART_ESI_CMD2, UART_MCR);
- serial_out(info, UART_ESI_CMD2, info->MCR);
- }
-
- /* Handle transition away from B0 status */
- if (!(old_termios->c_cflag & CBAUD) &&
- (tty->termios->c_cflag & CBAUD)) {
- info->MCR |= (UART_MCR_DTR | UART_MCR_RTS);
- serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
- serial_out(info, UART_ESI_CMD2, UART_MCR);
- serial_out(info, UART_ESI_CMD2, info->MCR);
- }
-
- spin_unlock_irqrestore(&info->lock, flags);
-
- /* Handle turning of CRTSCTS */
- if ((old_termios->c_cflag & CRTSCTS) &&
- !(tty->termios->c_cflag & CRTSCTS)) {
- rs_start(tty);
- }
-}
-
-/*
- * ------------------------------------------------------------
- * rs_close()
- *
- * This routine is called when the serial port gets closed. First, we
- * wait for the last remaining data to be sent. Then, we unlink its
- * async structure from the interrupt chain if necessary, and we free
- * that IRQ if nothing is left in the chain.
- * ------------------------------------------------------------
- */
-static void rs_close(struct tty_struct *tty, struct file *filp)
-{
- struct esp_struct *info = tty->driver_data;
- unsigned long flags;
-
- if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
- return;
-
- spin_lock_irqsave(&info->lock, flags);
-
- if (tty_hung_up_p(filp)) {
- DBG_CNT("before DEC-hung");
- goto out;
- }
-
-#ifdef SERIAL_DEBUG_OPEN
- printk(KERN_DEBUG "rs_close ttys%d, count = %d\n",
- info->line, info->port.count);
-#endif
- if (tty->count == 1 && info->port.count != 1) {
- /*
- * Uh, oh. tty->count is 1, which means that the tty
- * structure will be freed. Info->count should always
- * be one in these conditions. If it's greater than
- * one, we've got real problems, since it means the
- * serial port won't be shutdown.
- */
- printk(KERN_DEBUG "rs_close: bad serial port count; tty->count is 1, info->port.count is %d\n", info->port.count);
- info->port.count = 1;
- }
- if (--info->port.count < 0) {
- printk(KERN_ERR "rs_close: bad serial port count for ttys%d: %d\n",
- info->line, info->port.count);
- info->port.count = 0;
- }
- if (info->port.count) {
- DBG_CNT("before DEC-2");
- goto out;
- }
- info->port.flags |= ASYNC_CLOSING;
-
- spin_unlock_irqrestore(&info->lock, flags);
- /*
- * Now we wait for the transmit buffer to clear; and we notify
- * the line discipline to only process XON/XOFF characters.
- */
- tty->closing = 1;
- if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
- tty_wait_until_sent(tty, info->closing_wait);
- /*
- * At this point we stop accepting input. To do this, we
- * disable the receive line status interrupts, and tell the
- * interrupt driver to stop checking the data ready bit in the
- * line status register.
- */
- /* info->IER &= ~UART_IER_RLSI; */
- info->IER &= ~UART_IER_RDI;
- info->read_status_mask &= ~UART_LSR_DR;
- if (info->port.flags & ASYNC_INITIALIZED) {
-
- spin_lock_irqsave(&info->lock, flags);
- serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
- serial_out(info, UART_ESI_CMD2, info->IER);
-
- /* disable receive timeout */
- serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
- serial_out(info, UART_ESI_CMD2, 0x00);
-
- spin_unlock_irqrestore(&info->lock, flags);
-
- /*
- * Before we drop DTR, make sure the UART transmitter
- * has completely drained; this is especially
- * important if there is a transmit FIFO!
- */
- rs_wait_until_sent(tty, info->timeout);
- }
- shutdown(info);
- rs_flush_buffer(tty);
- tty_ldisc_flush(tty);
- tty->closing = 0;
- info->port.tty = NULL;
-
- if (info->port.blocked_open) {
- if (info->close_delay)
- msleep_interruptible(jiffies_to_msecs(info->close_delay));
- wake_up_interruptible(&info->port.open_wait);
- }
- info->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
- wake_up_interruptible(&info->port.close_wait);
- return;
-
-out:
- spin_unlock_irqrestore(&info->lock, flags);
-}
-
-static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
-{
- struct esp_struct *info = tty->driver_data;
- unsigned long orig_jiffies, char_time;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
- return;
-
- orig_jiffies = jiffies;
- char_time = ((info->timeout - HZ / 50) / 1024) / 5;
-
- if (!char_time)
- char_time = 1;
-
- spin_lock_irqsave(&info->lock, flags);
- serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
- serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
-
- while ((serial_in(info, UART_ESI_STAT1) != 0x03) ||
- (serial_in(info, UART_ESI_STAT2) != 0xff)) {
-
- spin_unlock_irqrestore(&info->lock, flags);
- msleep_interruptible(jiffies_to_msecs(char_time));
-
- if (signal_pending(current))
- return;
-
- if (timeout && time_after(jiffies, orig_jiffies + timeout))
- return;
-
- spin_lock_irqsave(&info->lock, flags);
- serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
- serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
- }
- spin_unlock_irqrestore(&info->lock, flags);
- set_current_state(TASK_RUNNING);
-}
-
-/*
- * esp_hangup() --- called by tty_hangup() when a hangup is signaled.
- */
-static void esp_hangup(struct tty_struct *tty)
-{
- struct esp_struct *info = tty->driver_data;
-
- if (serial_paranoia_check(info, tty->name, "esp_hangup"))
- return;
-
- rs_flush_buffer(tty);
- shutdown(info);
- info->port.count = 0;
- info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
- info->port.tty = NULL;
- wake_up_interruptible(&info->port.open_wait);
-}
-
-static int esp_carrier_raised(struct tty_port *port)
-{
- struct esp_struct *info = container_of(port, struct esp_struct, port);
- serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
- if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD)
- return 1;
- return 0;
-}
-
-/*
- * ------------------------------------------------------------
- * esp_open() and friends
- * ------------------------------------------------------------
- */
-static int block_til_ready(struct tty_struct *tty, struct file *filp,
- struct esp_struct *info)
-{
- DECLARE_WAITQUEUE(wait, current);
- int retval;
- int do_clocal = 0;
- unsigned long flags;
- int cd;
- struct tty_port *port = &info->port;
-
- /*
- * If the device is in the middle of being closed, then block
- * until it's done, and then try again.
- */
- if (tty_hung_up_p(filp) ||
- (port->flags & ASYNC_CLOSING)) {
- if (port->flags & ASYNC_CLOSING)
- interruptible_sleep_on(&port->close_wait);
-#ifdef SERIAL_DO_RESTART
- if (port->flags & ASYNC_HUP_NOTIFY)
- return -EAGAIN;
- else
- return -ERESTARTSYS;
-#else
- return -EAGAIN;
-#endif
- }
-
- /*
- * If non-blocking mode is set, or the port is not enabled,
- * then make the check up front and then exit.
- */
- if ((filp->f_flags & O_NONBLOCK) ||
- (tty->flags & (1 << TTY_IO_ERROR))) {
- port->flags |= ASYNC_NORMAL_ACTIVE;
- return 0;
- }
-
- if (tty->termios->c_cflag & CLOCAL)
- do_clocal = 1;
-
- /*
- * Block waiting for the carrier detect and the line to become
- * free (i.e., not in use by the callout). While we are in
- * this loop, port->count is dropped by one, so that
- * rs_close() knows when to free things. We restore it upon
- * exit, either normal or abnormal.
- */
- retval = 0;
- add_wait_queue(&port->open_wait, &wait);
-#ifdef SERIAL_DEBUG_OPEN
- printk(KERN_DEBUG "block_til_ready before block: ttys%d, count = %d\n",
- info->line, port->count);
-#endif
- spin_lock_irqsave(&info->lock, flags);
- if (!tty_hung_up_p(filp))
- port->count--;
- port->blocked_open++;
- while (1) {
- if ((tty->termios->c_cflag & CBAUD)) {
- unsigned int scratch;
-
- serial_out(info, UART_ESI_CMD1, ESI_READ_UART);
- serial_out(info, UART_ESI_CMD2, UART_MCR);
- scratch = serial_in(info, UART_ESI_STAT1);
- serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
- serial_out(info, UART_ESI_CMD2, UART_MCR);
- serial_out(info, UART_ESI_CMD2,
- scratch | UART_MCR_DTR | UART_MCR_RTS);
- }
- set_current_state(TASK_INTERRUPTIBLE);
- if (tty_hung_up_p(filp) ||
- !(port->flags & ASYNC_INITIALIZED)) {
-#ifdef SERIAL_DO_RESTART
- if (port->flags & ASYNC_HUP_NOTIFY)
- retval = -EAGAIN;
- else
- retval = -ERESTARTSYS;
-#else
- retval = -EAGAIN;
-#endif
- break;
- }
-
- cd = tty_port_carrier_raised(port);
-
- if (!(port->flags & ASYNC_CLOSING) &&
- (do_clocal))
- break;
- if (signal_pending(current)) {
- retval = -ERESTARTSYS;
- break;
- }
-#ifdef SERIAL_DEBUG_OPEN
- printk(KERN_DEBUG "block_til_ready blocking: ttys%d, count = %d\n",
- info->line, port->count);
-#endif
- spin_unlock_irqrestore(&info->lock, flags);
- schedule();
- spin_lock_irqsave(&info->lock, flags);
- }
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&port->open_wait, &wait);
- if (!tty_hung_up_p(filp))
- port->count++;
- port->blocked_open--;
- spin_unlock_irqrestore(&info->lock, flags);
-#ifdef SERIAL_DEBUG_OPEN
- printk(KERN_DEBUG "block_til_ready after blocking: ttys%d, count = %d\n",
- info->line, port->count);
-#endif
- if (retval)
- return retval;
- port->flags |= ASYNC_NORMAL_ACTIVE;
- return 0;
-}
-
-/*
- * This routine is called whenever a serial port is opened. It
- * enables interrupts for a serial port, linking in its async structure into
- * the IRQ chain. It also performs the serial-specific
- * initialization for the tty structure.
- */
-static int esp_open(struct tty_struct *tty, struct file *filp)
-{
- struct esp_struct *info;
- int retval, line;
- unsigned long flags;
-
- line = tty->index;
- if ((line < 0) || (line >= NR_PORTS))
- return -ENODEV;
-
- /* find the port in the chain */
-
- info = ports;
-
- while (info && (info->line != line))
- info = info->next_port;
-
- if (!info) {
- serial_paranoia_check(info, tty->name, "esp_open");
- return -ENODEV;
- }
-
-#ifdef SERIAL_DEBUG_OPEN
- printk(KERN_DEBUG "esp_open %s, count = %d\n", tty->name, info->port.count);
-#endif
- spin_lock_irqsave(&info->lock, flags);
- info->port.count++;
- tty->driver_data = info;
- info->port.tty = tty;
-
- spin_unlock_irqrestore(&info->lock, flags);
-
- /*
- * Start up serial port
- */
- retval = startup(info);
- if (retval)
- return retval;
-
- retval = block_til_ready(tty, filp, info);
- if (retval) {
-#ifdef SERIAL_DEBUG_OPEN
- printk(KERN_DEBUG "esp_open returning after block_til_ready with %d\n",
- retval);
-#endif
- return retval;
- }
-#ifdef SERIAL_DEBUG_OPEN
- printk(KERN_DEBUG "esp_open %s successful...", tty->name);
-#endif
- return 0;
-}
-
-/*
- * ---------------------------------------------------------------------
- * espserial_init() and friends
- *
- * espserial_init() is called at boot-time to initialize the serial driver.
- * ---------------------------------------------------------------------
- */
-
-/*
- * This routine prints out the appropriate serial driver version
- * number, and identifies which options were configured into this
- * driver.
- */
-
-static void __init show_serial_version(void)
-{
- printk(KERN_INFO "%s version %s (DMA %u)\n",
- serial_name, serial_version, dma);
-}
-
-/*
- * This routine is called by espserial_init() to initialize a specific serial
- * port.
- */
-static int autoconfig(struct esp_struct *info)
-{
- int port_detected = 0;
- unsigned long flags;
-
- if (!request_region(info->io_port, REGION_SIZE, "esp serial"))
- return -EIO;
-
- spin_lock_irqsave(&info->lock, flags);
- /*
- * Check for ESP card
- */
-
- if (serial_in(info, UART_ESI_BASE) == 0xf3) {
- serial_out(info, UART_ESI_CMD1, 0x00);
- serial_out(info, UART_ESI_CMD1, 0x01);
-
- if ((serial_in(info, UART_ESI_STAT2) & 0x70) == 0x20) {
- port_detected = 1;
-
- if (!(info->irq)) {
- serial_out(info, UART_ESI_CMD1, 0x02);
-
- if (serial_in(info, UART_ESI_STAT1) & 0x01)
- info->irq = 3;
- else
- info->irq = 4;
- }
-
-
- /* put card in enhanced mode */
- /* this prevents access through */
- /* the "old" IO ports */
- esp_basic_init(info);
-
- /* clear out MCR */
- serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
- serial_out(info, UART_ESI_CMD2, UART_MCR);
- serial_out(info, UART_ESI_CMD2, 0x00);
- }
- }
- if (!port_detected)
- release_region(info->io_port, REGION_SIZE);
-
- spin_unlock_irqrestore(&info->lock, flags);
- return (port_detected);
-}
-
-static const struct tty_operations esp_ops = {
- .open = esp_open,
- .close = rs_close,
- .write = rs_write,
- .put_char = rs_put_char,
- .flush_chars = rs_flush_chars,
- .write_room = rs_write_room,
- .chars_in_buffer = rs_chars_in_buffer,
- .flush_buffer = rs_flush_buffer,
- .ioctl = rs_ioctl,
- .throttle = rs_throttle,
- .unthrottle = rs_unthrottle,
- .set_termios = rs_set_termios,
- .stop = rs_stop,
- .start = rs_start,
- .hangup = esp_hangup,
- .break_ctl = esp_break,
- .wait_until_sent = rs_wait_until_sent,
- .tiocmget = esp_tiocmget,
- .tiocmset = esp_tiocmset,
-};
-
-static const struct tty_port_operations esp_port_ops = {
- .esp_carrier_raised,
-};
-
-/*
- * The serial driver boot-time initialization code!
- */
-static int __init espserial_init(void)
-{
- int i, offset;
- struct esp_struct *info;
- struct esp_struct *last_primary = NULL;
- int esp[] = { 0x100, 0x140, 0x180, 0x200, 0x240, 0x280, 0x300, 0x380 };
-
- esp_driver = alloc_tty_driver(NR_PORTS);
- if (!esp_driver)
- return -ENOMEM;
-
- for (i = 0; i < NR_PRIMARY; i++) {
- if (irq[i] != 0) {
- if ((irq[i] < 2) || (irq[i] > 15) || (irq[i] == 6) ||
- (irq[i] == 8) || (irq[i] == 13))
- irq[i] = 0;
- else if (irq[i] == 2)
- irq[i] = 9;
- }
- }
-
- if ((dma != 1) && (dma != 3))
- dma = 0;
-
- if ((rx_trigger < 1) || (rx_trigger > 1023))
- rx_trigger = 768;
-
- if ((tx_trigger < 1) || (tx_trigger > 1023))
- tx_trigger = 768;
-
- if ((flow_off < 1) || (flow_off > 1023))
- flow_off = 1016;
-
- if ((flow_on < 1) || (flow_on > 1023))
- flow_on = 944;
-
- if ((rx_timeout < 0) || (rx_timeout > 255))
- rx_timeout = 128;
-
- if (flow_on >= flow_off)
- flow_on = flow_off - 1;
-
- show_serial_version();
-
- /* Initialize the tty_driver structure */
-
- esp_driver->owner = THIS_MODULE;
- esp_driver->name = "ttyP";
- esp_driver->major = ESP_IN_MAJOR;
- esp_driver->minor_start = 0;
- esp_driver->type = TTY_DRIVER_TYPE_SERIAL;
- esp_driver->subtype = SERIAL_TYPE_NORMAL;
- esp_driver->init_termios = tty_std_termios;
- esp_driver->init_termios.c_cflag =
- B9600 | CS8 | CREAD | HUPCL | CLOCAL;
- esp_driver->init_termios.c_ispeed = 9600;
- esp_driver->init_termios.c_ospeed = 9600;
- esp_driver->flags = TTY_DRIVER_REAL_RAW;
- tty_set_operations(esp_driver, &esp_ops);
- if (tty_register_driver(esp_driver)) {
- printk(KERN_ERR "Couldn't register esp serial driver");
- put_tty_driver(esp_driver);
- return 1;
- }
-
- info = kzalloc(sizeof(struct esp_struct), GFP_KERNEL);
-
- if (!info) {
- printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
- tty_unregister_driver(esp_driver);
- put_tty_driver(esp_driver);
- return 1;
- }
-
- spin_lock_init(&info->lock);
- /* rx_trigger, tx_trigger are needed by autoconfig */
- info->config.rx_trigger = rx_trigger;
- info->config.tx_trigger = tx_trigger;
-
- i = 0;
- offset = 0;
-
- do {
- tty_port_init(&info->port);
- info->port.ops = &esp_port_ops;
- info->io_port = esp[i] + offset;
- info->irq = irq[i];
- info->line = (i * 8) + (offset / 8);
-
- if (!autoconfig(info)) {
- i++;
- offset = 0;
- continue;
- }
-
- info->custom_divisor = (divisor[i] >> (offset / 2)) & 0xf;
- info->port.flags = STD_COM_FLAGS;
- if (info->custom_divisor)
- info->port.flags |= ASYNC_SPD_CUST;
- info->magic = ESP_MAGIC;
- info->close_delay = 5*HZ/10;
- info->closing_wait = 30*HZ;
- info->config.rx_timeout = rx_timeout;
- info->config.flow_on = flow_on;
- info->config.flow_off = flow_off;
- info->config.pio_threshold = pio_threshold;
- info->next_port = ports;
- init_waitqueue_head(&info->break_wait);
- ports = info;
- printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ",
- info->line, info->io_port, info->irq);
-
- if (info->line % 8) {
- printk("secondary port\n");
- /* 8 port cards can't do DMA */
- info->stat_flags |= ESP_STAT_NEVER_DMA;
-
- if (last_primary)
- last_primary->stat_flags |= ESP_STAT_NEVER_DMA;
- } else {
- printk("primary port\n");
- last_primary = info;
- irq[i] = info->irq;
- }
-
- if (!dma)
- info->stat_flags |= ESP_STAT_NEVER_DMA;
-
- info = kzalloc(sizeof(struct esp_struct), GFP_KERNEL);
- if (!info) {
- printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
- /* allow use of the already detected ports */
- return 0;
- }
-
- spin_lock_init(&info->lock);
- /* rx_trigger, tx_trigger are needed by autoconfig */
- info->config.rx_trigger = rx_trigger;
- info->config.tx_trigger = tx_trigger;
-
- if (offset == 56) {
- i++;
- offset = 0;
- } else {
- offset += 8;
- }
- } while (i < NR_PRIMARY);
-
- /* free the last port memory allocation */
- kfree(info);
-
- return 0;
-}
-
-static void __exit espserial_exit(void)
-{
- int e1;
- struct esp_struct *temp_async;
- struct esp_pio_buffer *pio_buf;
-
- e1 = tty_unregister_driver(esp_driver);
- if (e1)
- printk(KERN_ERR "esp: failed to unregister driver (%d)\n", e1);
- put_tty_driver(esp_driver);
-
- while (ports) {
- if (ports->io_port)
- release_region(ports->io_port, REGION_SIZE);
- temp_async = ports->next_port;
- kfree(ports);
- ports = temp_async;
- }
-
- if (dma_buffer)
- free_pages((unsigned long)dma_buffer,
- get_order(DMA_BUFFER_SZ));
-
- while (free_pio_buf) {
- pio_buf = free_pio_buf->next;
- kfree(free_pio_buf);
- free_pio_buf = pio_buf;
- }
-}
-
-module_init(espserial_init);
-module_exit(espserial_exit);
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff