Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-16 09:02:00 +00:00
Code Issues Packages Projects Releases Wiki Activity
9a6f70bbed
linux/drivers/char/esp.c
Ingo Molnar 80d38f9a78 drivers/char/esp.c: fix bootup lockup 
randconfig testing found a bootup lockup in drivers/char/esp.c because
of a spinlock that wasn't correctly initialized.

I'm not sure why it became more prominent in 2.6.25-rc4, the bug seems
rather old and i've been doing allyesconfig bootups for ages with
CONFIG_ESP enabled.

This fixes this bootup lockup:

 PM: Adding info for No Bus:ttyP63
 ttyP32 at 0x0240 (irq = 0) is an ESP primary port
 BUG: spinlock lockup on CPU#0, swapper/1, f56dd004
 Pid: 1, comm: swapper Not tainted 2.6.25-rc4-sched-devel.git-x86-latest.git #402 [<c03ac6f4>] _raw_spin_lock+0x134/0x140
  [<c08649be>] _spin_lock_irqsave+0x5e/0x80
  [<c0b9fbfe>] ? espserial_init+0x2be/0x6e0
  [<c0b9fbfe>] espserial_init+0x2be/0x6e0
  [<c0b877a3>] kernel_init+0x83/0x260
  [<c0b9f940>] ? espserial_init+0x0/0x6e0
  [<c010416a>] ? restore_nocheck_notrace+0x0/0xe
  [<c0b87720>] ? kernel_init+0x0/0x260
  [<c0b87720>] ? kernel_init+0x0/0x260
  [<c0104507>] kernel_thread_helper+0x7/0x10
  =======================

kzalloc() is not the way to initialize spinlocks anymore.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-03-07 10:05:13 -08:00

2540 lines
66 KiB
C
Raw Blame History

/*
* 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 <asm/io.h>
#include <asm/dma.h>
#include <linux/slab.h>
#include <asm/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("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
tty->name, (info->flags), serial_driver.refcount,info->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->port + offset);
}
static inline void serial_out(struct esp_struct *info, int offset,
unsigned char value)
{
outb(value, info->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 = (struct esp_struct *)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 = (struct esp_struct *)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->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->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->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->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 inline void receive_chars_dma(struct esp_struct *info, int num_bytes)
{
unsigned long flags;
info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
dma_bytes = num_bytes;
info->stat_flags |= ESP_STAT_DMA_RX;
flags=claim_dma_lock();
disable_dma(dma);
clear_dma_ff(dma);
set_dma_mode(dma, DMA_MODE_READ);
set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
set_dma_count(dma, dma_bytes);
enable_dma(dma);
release_dma_lock(flags);
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->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->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->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->tty)
tty_wakeup(info->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)
{
unsigned long flags;
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->tty)
tty_wakeup(info->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;
flags=claim_dma_lock();
disable_dma(dma);
clear_dma_ff(dma);
set_dma_mode(dma, DMA_MODE_WRITE);
set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
set_dma_count(dma, dma_bytes);
enable_dma(dma);
release_dma_lock(flags);
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);
flags=claim_dma_lock();
disable_dma(dma);
clear_dma_ff(dma);
set_dma_mode(dma, DMA_MODE_WRITE);
set_dma_addr(dma, isa_virt_to_bus(dma_buffer));
set_dma_count(dma, dma_bytes);
enable_dma(dma);
release_dma_lock(flags);
serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
} else {
dma_bytes = 0;
info->stat_flags &= ~ESP_STAT_DMA_TX;
}
}
static inline 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->delta_msr_wait);
}
if ((info->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->open_wait);
else {
#ifdef SERIAL_DEBUG_OPEN
printk("scheduling hangup...");
#endif
tty_hangup(info->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->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->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->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 inline 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->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("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->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->tty)
set_bit(TTY_IO_ERROR,
&info->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->tty)
clear_bit(TTY_IO_ERROR, &info->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->tty) {
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
info->tty->alt_speed = 57600;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
info->tty->alt_speed = 115200;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
info->tty->alt_speed = 230400;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
info->tty->alt_speed = 460800;
}
/*
* set the speed of the serial port
*/
change_speed(info);
info->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->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->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->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->tty || (info->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->tty)
set_bit(TTY_IO_ERROR, &info->tty->flags);
info->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->tty || !info->tty->termios)
return;
cflag = info->tty->termios->c_cflag;
port = info->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->tty);
if (baud == 38400 &&
((info->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;
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->flags |= ASYNC_CTS_FLOW;
/* info->IER |= UART_IER_MSI; */
flow1 = 0x04;
flow2 = 0x10;
} else
info->flags &= ~ASYNC_CTS_FLOW;
if (cflag & CLOCAL)
info->flags &= ~ASYNC_CHECK_CD;
else {
info->flags |= ASYNC_CHECK_CD;
/* info->IER |= UART_IER_MSI; */
}
/*
* Set up parity check flag
*/
info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
if (I_INPCK(info->tty))
info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
if (I_BRKINT(info->tty) || I_PARMRK(info->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->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->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->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->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->tty)) {
serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CHARS);
serial_out(info, UART_ESI_CMD2, START_CHAR(info->tty));
serial_out(info, UART_ESI_CMD2, STOP_CHAR(info->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 void rs_put_char(struct tty_struct *tty, unsigned char ch)
{
struct esp_struct *info = (struct esp_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->name, "rs_put_char"))
return;
if (!info->xmit_buf)
return;
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++;
}
spin_unlock_irqrestore(&info->lock, flags);
}
static void rs_flush_chars(struct tty_struct *tty)
{
struct esp_struct *info = (struct esp_struct *)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 = (struct esp_struct *)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 = (struct esp_struct *)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 = (struct esp_struct *)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 = (struct esp_struct *)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 = (struct esp_struct *)tty->driver_data;
unsigned long flags;
#ifdef SERIAL_DEBUG_THROTTLE
char buf[64];
printk("throttle %s: %d....\n", tty_name(tty, buf),
tty->ldisc.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 = (struct esp_struct *)tty->driver_data;
unsigned long flags;
#ifdef SERIAL_DEBUG_THROTTLE
char buf[64];
printk("unthrottle %s: %d....\n", tty_name(tty, buf),
tty->ldisc.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;
memset(&tmp, 0, sizeof(tmp));
tmp.type = PORT_16550A;
tmp.line = info->line;
tmp.port = info->port;
tmp.irq = info->irq;
tmp.flags = info->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;
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));
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);
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->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->flags & ~ASYNC_USR_MASK)))
return -EPERM;
info->flags = ((info->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->count > 1)
return -EBUSY;
} else if (current_async->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->flags = ((info->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->flags & ASYNC_INITIALIZED) {
if (((old_info.flags & ASYNC_SPD_MASK) !=
(info->flags & ASYNC_SPD_MASK)) ||
(old_info.custom_divisor != info->custom_divisor)) {
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
info->tty->alt_speed = 57600;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
info->tty->alt_speed = 115200;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
info->tty->alt_speed = 230400;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
info->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->count > 1)
return -EBUSY;
} else if (current_async->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->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)) {
unsigned long flags;
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)) {
unsigned long flags;
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) {
unsigned long flags;
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->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 = (struct esp_struct *)tty->driver_data;
unsigned char control, status;
unsigned long flags;
if (serial_paranoia_check(info, tty->name, __FUNCTION__))
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 = (struct esp_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->name, __FUNCTION__))
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 void esp_break(struct tty_struct *tty, int break_state)
{
struct esp_struct * info = (struct esp_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->name, "esp_break"))
return;
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);
}
}
static int rs_ioctl(struct tty_struct *tty, struct file * file,
unsigned int cmd, unsigned long arg)
{
struct esp_struct * info = (struct esp_struct *)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;
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:
return set_serial_info(info, argp);
case TIOCSERCONFIG:
/* do not reconfigure after initial configuration */
return 0;
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->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:
return set_esp_config(info, argp);
default:
return -ENOIOCTLCMD;
}
return 0;
}
static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
{
struct esp_struct *info = (struct esp_struct *)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 = (struct esp_struct *)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("rs_close ttys%d, count = %d\n", info->line, info->count);
#endif
if ((tty->count == 1) && (info->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("rs_close: bad serial port count; tty->count is 1, "
"info->count is %d\n", info->count);
info->count = 1;
}
if (--info->count < 0) {
printk("rs_close: bad serial port count for ttys%d: %d\n",
info->line, info->count);
info->count = 0;
}
if (info->count) {
DBG_CNT("before DEC-2");
goto out;
}
info->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->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);
if (tty->driver->flush_buffer)
tty->driver->flush_buffer(tty);
tty_ldisc_flush(tty);
tty->closing = 0;
info->tty = NULL;
if (info->blocked_open) {
if (info->close_delay) {
msleep_interruptible(jiffies_to_msecs(info->close_delay));
}
wake_up_interruptible(&info->open_wait);
}
info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
wake_up_interruptible(&info->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 = (struct esp_struct *)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))
break;
if (timeout && time_after(jiffies, orig_jiffies + timeout))
break;
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 = (struct esp_struct *)tty->driver_data;
if (serial_paranoia_check(info, tty->name, "esp_hangup"))
return;
rs_flush_buffer(tty);
shutdown(info);
info->count = 0;
info->flags &= ~ASYNC_NORMAL_ACTIVE;
info->tty = NULL;
wake_up_interruptible(&info->open_wait);
}
/*
* ------------------------------------------------------------
* 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;
/*
* 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) ||
(info->flags & ASYNC_CLOSING)) {
if (info->flags & ASYNC_CLOSING)
interruptible_sleep_on(&info->close_wait);
#ifdef SERIAL_DO_RESTART
if (info->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))) {
info->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, info->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(&info->open_wait, &wait);
#ifdef SERIAL_DEBUG_OPEN
printk("block_til_ready before block: ttys%d, count = %d\n",
info->line, info->count);
#endif
spin_lock_irqsave(&info->lock, flags);
if (!tty_hung_up_p(filp))
info->count--;
info->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) ||
!(info->flags & ASYNC_INITIALIZED)) {
#ifdef SERIAL_DO_RESTART
if (info->flags & ASYNC_HUP_NOTIFY)
retval = -EAGAIN;
else
retval = -ERESTARTSYS;
#else
retval = -EAGAIN;
#endif
break;
}
serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD)
do_clocal = 1;
if (!(info->flags & ASYNC_CLOSING) &&
(do_clocal))
break;
if (signal_pending(current)) {
retval = -ERESTARTSYS;
break;
}
#ifdef SERIAL_DEBUG_OPEN
printk("block_til_ready blocking: ttys%d, count = %d\n",
info->line, info->count);
#endif
spin_unlock_irqrestore(&info->lock, flags);
schedule();
spin_lock_irqsave(&info->lock, flags);
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&info->open_wait, &wait);
if (!tty_hung_up_p(filp))
info->count++;
info->blocked_open--;
spin_unlock_irqrestore(&info->lock, flags);
#ifdef SERIAL_DEBUG_OPEN
printk("block_til_ready after blocking: ttys%d, count = %d\n",
info->line, info->count);
#endif
if (retval)
return retval;
info->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("esp_open %s, count = %d\n", tty->name, info->count);
#endif
spin_lock_irqsave(&info->lock, flags);
info->count++;
tty->driver_data = info;
info->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("esp_open returning after block_til_ready with %d\n",
retval);
#endif
return retval;
}
#ifdef SERIAL_DEBUG_OPEN
printk("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 inline void 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 inline int autoconfig(struct esp_struct * info)
{
int port_detected = 0;
unsigned long flags;
if (!request_region(info->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->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,
};
/*
* 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->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 {
info->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->flags = STD_COM_FLAGS;
if (info->custom_divisor)
info->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->open_wait);
init_waitqueue_head(&info->close_wait);
init_waitqueue_head(&info->delta_msr_wait);
init_waitqueue_head(&info->break_wait);
ports = info;
printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ",
info->line, info->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;
/* printk("Unloading %s: version %s\n", serial_name, serial_version); */
if ((e1 = tty_unregister_driver(esp_driver)))
printk("SERIAL: failed to unregister serial driver (%d)\n",
e1);
put_tty_driver(esp_driver);
while (ports) {
if (ports->port) {
release_region(ports->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);
Reference in New Issue View Git Blame Copy Permalink