isdn_hybrid.c
/*
* linux/drivers/char/serial.c
*
* 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.
*
* 1/97: Extended dumb serial ports are a config option now.
* Saves 4k. Michael A. Griffith <grif@acm.org>
*
* 8/97: Fix bug in rs_set_termios with RTS
* Stanislav V. Voronyi <stas@uanet.kharkov.ua>
*
* This module exports the following rs232 io functions:
*
* int rs_init(void);
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.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/malloc.h>
#include <linux/init.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/bitops.h>
static char *serial_name = "Serial driver";
static char *serial_version = "4.24";
static DECLARE_TASK_QUEUE(tq_serial);
static struct tty_driver serial_driver, callout_driver;
static int serial_refcount;
/* number of characters left in xmit buffer before we ask for more */
#define WAKEUP_CHARS 256
#define SERIAL_PARANOIA_CHECK
#define CONFIG_SERIAL_NOPAUSE_IO
#define SERIAL_DO_RESTART
/* Sanity checks */
/* Set of debugging defines */
#undef SERIAL_DEBUG_INTR
#undef SERIAL_DEBUG_OPEN
#undef SERIAL_DEBUG_FLOW
#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
#define RS_STROBE_TIME (10*HZ)
#define RS_ISR_PASS_LIMIT 256
#define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? SA_SHIRQ : SA_INTERRUPT)
#define _INLINE_ inline
#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
kdevname(tty->device), (info->flags), serial_refcount,info->count,tty->count,s)
#else
#define DBG_CNT(s)
#endif
/*
* IRQ_timeout - How long the timeout should be for each IRQ
* should be after the IRQ has been active.
*/
static struct async_struct *IRQ_ports[16];
static int IRQ_timeout[16];
static volatile int rs_irq_triggered;
static volatile int rs_triggered;
static int rs_wild_int_mask;
static void autoconfig(struct serial_state * info);
static void change_speed(struct async_struct *info);
static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
/*
* Here we define the default xmit fifo size used for each type of
* UART
*/
static struct serial_uart_config uart_config[] = {
{ "unknown", 1, 0 },
{ "8250", 1, 0 },
{ "16450", 1, 0 },
{ "16550", 1, 0 },
{ "16550A", 16, UART_CLEAR_FIFO | UART_USE_FIFO },
{ "cirrus", 1, 0 },
{ "ST16650", 1, UART_CLEAR_FIFO |UART_STARTECH },
{ "ST16650V2", 32, UART_CLEAR_FIFO | UART_USE_FIFO |
UART_STARTECH },
{ "TI16750", 64, UART_CLEAR_FIFO | UART_USE_FIFO},
{ 0, 0}
};
/*
* This assumes you have a 1.8432 MHz clock for your UART.
*
* It'd be nice if someone built a serial card with a 24.576 MHz
* clock, since the 16550A is capable of handling a top speed of 1.5
* megabits/second; but this requires the faster clock.
*/
#define BASE_BAUD ( 1843200 / 16 )
/* Standard COM flags (except for COM4, because of the 8514 problem) */
#define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST )
#define STD_COM4_FLAGS ASYNC_BOOT_AUTOCONF
#define C_P(card,port) (((card)<<6|(port)<<3) + 1)
static struct serial_state rs_table[] = {
/* UART CLK PORT IRQ FLAGS */
{ 0, BASE_BAUD, 0x3F8, 4, STD_COM_FLAGS }, /* ttyS0 */
{ 0, BASE_BAUD, 0x2F8, 3, STD_COM_FLAGS }, /* ttyS1 */
{ 0, BASE_BAUD, 0x3E8, 4, STD_COM_FLAGS }, /* ttyS2 */
{ 0, BASE_BAUD, 0x2E8, 3, STD_COM4_FLAGS }, /* ttyS3 */
};
#define NR_PORTS (sizeof(rs_table)/sizeof(struct serial_state))
static struct tty_struct *serial_table[NR_PORTS];
static struct termios *serial_termios[NR_PORTS];
static struct termios *serial_termios_locked[NR_PORTS];
#ifndef MIN
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#endif
/*
* tmp_buf is used as a temporary buffer by serial_write. We need to
* lock it in case the copy_from_user blocks while swapping in a page,
* and some other program tries to do a serial write at the same time.
* Since the lock will only come under contention when the system is
* swapping and available memory is low, it makes sense to share one
* buffer across all the serial ports, since it significantly saves
* memory if large numbers of serial ports are open.
*/
static unsigned char *tmp_buf = 0;
static struct semaphore tmp_buf_sem = MUTEX;
static inline int serial_paranoia_check(struct async_struct *info,
kdev_t device, const char *routine)
{
#ifdef SERIAL_PARANOIA_CHECK
static const char *badmagic =
"Warning: bad magic number for serial struct (%s) in %s\n";
static const char *badinfo =
"Warning: null async_struct for (%s) in %s\n";
if (!info) {
printk(badinfo, kdevname(device), routine);
return 1;
}
if (info->magic != SERIAL_MAGIC) {
printk(badmagic, kdevname(device), routine);
return 1;
}
#endif
return 0;
}
static inline unsigned int serial_in(struct async_struct *info, int offset)
{
return inb(info->port + offset);
}
static inline unsigned int serial_inp(struct async_struct *info, int offset)
{
#ifdef CONFIG_SERIAL_NOPAUSE_IO
return inb(info->port + offset);
#else
return inb_p(info->port + offset);
#endif
}
static inline void serial_out(struct async_struct *info, int offset, int value)
{
outb(value, info->port+offset);
}
static inline void serial_outp(struct async_struct *info, int offset,
int value)
{
#ifdef CONFIG_SERIAL_NOPAUSE_IO
outb(value, info->port+offset);
#else
outb_p(value, info->port+offset);
#endif
}
/*
* ------------------------------------------------------------
* 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 async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_stop"))
return;
save_flags(flags); cli();
if (info->IER & UART_IER_THRI) {
info->IER &= ~UART_IER_THRI;
serial_out(info, UART_IER, info->IER);
}
restore_flags(flags);
}
static void rs_start(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_start"))
return;
save_flags(flags); cli();
if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) {
info->IER |= UART_IER_THRI;
serial_out(info, UART_IER, info->IER);
}
restore_flags(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
* -----------------------------------------------------------------------
*/
/*
* This routine is used by the interrupt handler to schedule
* processing in the software interrupt portion of the driver.
*/
static _INLINE_ void rs_sched_event(struct async_struct *info,
int event)
{
info->event |= 1 << event;
queue_task(&info->tqueue, &tq_serial);
mark_bh(SERIAL_BH);
}
static _INLINE_ void receive_chars(struct async_struct *info,
int *status)
{
struct tty_struct *tty = info->tty;
unsigned char ch;
int ignored = 0;
struct async_icount *icount;
icount = &info->state->icount;
do {
ch = serial_inp(info, UART_RX);
if (tty->flip.count >= TTY_FLIPBUF_SIZE)
break;
*tty->flip.char_buf_ptr = ch;
icount->rx++;
#ifdef SERIAL_DEBUG_INTR
printk("DR%02x:%02x...", ch, *status);
#endif
*tty->flip.flag_buf_ptr = 0;
if (*status & (UART_LSR_BI | UART_LSR_PE |
UART_LSR_FE | UART_LSR_OE)) {
/*
* For statistics only
*/
if (*status & UART_LSR_BI) {
*status &= ~(UART_LSR_FE | UART_LSR_PE);
icount->brk++;
} else if (*status & UART_LSR_PE)
icount->parity++;
else if (*status & UART_LSR_FE)
icount->frame++;
if (*status & UART_LSR_OE)
icount->overrun++;
/*
* Now check to see if character should be
* ignored, and mask off conditions which
* should be ignored.
*/
if (*status & info->ignore_status_mask) {
if (++ignored > 100)
break;
goto ignore_char;
}
*status &= info->read_status_mask;
if (*status & (UART_LSR_BI)) {
#ifdef SERIAL_DEBUG_INTR
printk("handling break....");
#endif
*tty->flip.flag_buf_ptr = TTY_BREAK;
if (info->flags & ASYNC_SAK)
do_SAK(tty);
} else if (*status & UART_LSR_PE)
*tty->flip.flag_buf_ptr = TTY_PARITY;
else if (*status & UART_LSR_FE)
*tty->flip.flag_buf_ptr = TTY_FRAME;
if (*status & UART_LSR_OE) {
/*
* Overrun is special, since it's
* reported immediately, and doesn't
* affect the current character
*/
if (tty->flip.count < TTY_FLIPBUF_SIZE) {
tty->flip.count++;
tty->flip.flag_buf_ptr++;
tty->flip.char_buf_ptr++;
*tty->flip.flag_buf_ptr = TTY_OVERRUN;
}
}
}
tty->flip.flag_buf_ptr++;
tty->flip.char_buf_ptr++;
tty->flip.count++;
ignore_char:
*status = serial_inp(info, UART_LSR);
} while (*status & UART_LSR_DR);
isdn_hybrid_flip_buffer_push(tty);
}
static _INLINE_ void transmit_chars(struct async_struct *info, int *intr_done)
{
int count;
if (info->x_char) {
serial_outp(info, UART_TX, info->x_char);
info->state->icount.tx++;
info->x_char = 0;
if (intr_done)
*intr_done = 0;
return;
}
if ((info->xmit_cnt <= 0) || info->tty->stopped ||
info->tty->hw_stopped) {
info->IER &= ~UART_IER_THRI;
serial_out(info, UART_IER, info->IER);
return;
}
count = info->xmit_fifo_size;
do {
serial_out(info, UART_TX, info->xmit_buf[info->xmit_tail++]);
info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
info->state->icount.tx++;
if (--info->xmit_cnt <= 0)
break;
} while (--count > 0);
if (info->xmit_cnt < WAKEUP_CHARS)
rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
#ifdef SERIAL_DEBUG_INTR
printk("THRE...");
#endif
if (intr_done)
*intr_done = 0;
if (info->xmit_cnt <= 0) {
info->IER &= ~UART_IER_THRI;
serial_out(info, UART_IER, info->IER);
}
}
static _INLINE_ void check_modem_status(struct async_struct *info)
{
int status;
struct async_icount *icount;
status = serial_in(info, UART_MSR);
if (status & UART_MSR_ANY_DELTA) {
icount = &info->state->icount;
/* update input line counters */
if (status & UART_MSR_TERI)
icount->rng++;
if (status & UART_MSR_DDSR)
icount->dsr++;
if (status & UART_MSR_DDCD) {
icount->dcd++;
#ifdef CONFIG_HARD_PPS
if ((info->flags & ASYNC_HARDPPS_CD) &&
(status & UART_MSR_DCD))
hardpps();
#endif
}
if (status & UART_MSR_DCTS)
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 if (!((info->flags & ASYNC_CALLOUT_ACTIVE) &&
(info->flags & ASYNC_CALLOUT_NOHUP))) {
#ifdef SERIAL_DEBUG_OPEN
printk("doing serial hangup...");
#endif
if (info->tty)
tty_hangup(info->tty);
}
}
if (info->flags & ASYNC_CTS_FLOW) {
if (info->tty->hw_stopped) {
if (status & UART_MSR_CTS) {
#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
printk("CTS tx start...");
#endif
info->tty->hw_stopped = 0;
info->IER |= UART_IER_THRI;
serial_out(info, UART_IER, info->IER);
rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
return;
}
} else {
if (!(status & UART_MSR_CTS)) {
#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
printk("CTS tx stop...");
#endif
info->tty->hw_stopped = 1;
info->IER &= ~UART_IER_THRI;
serial_out(info, UART_IER, info->IER);
}
}
}
}
/*
* This is the serial driver's interrupt routine for a single port
*/
static void rs_interrupt_single(int irq, void *dev_id, struct pt_regs * regs)
{
int status;
int pass_counter = 0;
struct async_struct * info;
#ifdef SERIAL_DEBUG_INTR
printk("rs_interrupt_single(%d)...", irq);
#endif
info = IRQ_ports[irq];
if (!info || !info->tty)
return;
do {
status = serial_inp(info, UART_LSR);
#ifdef SERIAL_DEBUG_INTR
printk("status = %x...", status);
#endif
if (status & UART_LSR_DR)
receive_chars(info, &status);
check_modem_status(info);
if (status & UART_LSR_THRE)
transmit_chars(info, 0);
if (pass_counter++ > RS_ISR_PASS_LIMIT) {
#if 0
printk("rs_single loop break.\n");
#endif
break;
}
} while (!(serial_in(info, UART_IIR) & UART_IIR_NO_INT));
info->last_active = jiffies;
#ifdef SERIAL_DEBUG_INTR
printk("end.\n");
#endif
}
/*
* -------------------------------------------------------------------
* Here ends the serial interrupt routines.
* -------------------------------------------------------------------
*/
/*
* This routine is used to handle the "bottom half" processing for the
* serial driver, known also the "software interrupt" processing.
* This processing is done at the kernel interrupt level, after the
* rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
* is where time-consuming activities which can not be done in the
* interrupt driver proper are done; the interrupt driver schedules
* them using rs_sched_event(), and they get done here.
*/
static void do_serial_bh(void)
{
run_task_queue(&tq_serial);
}
static void do_softint(void *private_)
{
struct async_struct *info = (struct async_struct *) private_;
struct tty_struct *tty;
tty = info->tty;
if (!tty)
return;
if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
tty->ldisc.write_wakeup)
(tty->ldisc.write_wakeup)(tty);
wake_up_interruptible(&tty->write_wait);
}
}
/*
* This subroutine is called when the RS_TIMER goes off. It is used
* by the serial driver to handle ports that do not have an interrupt
* (irq=0). This doesn't work very well for 16450's, but gives barely
* passable results for a 16550A. (Although at the expense of much
* CPU overhead).
*/
static void rs_timer(void)
{
static unsigned long last_strobe = 0;
struct async_struct *info;
unsigned int i;
if ((jiffies - last_strobe) >= RS_STROBE_TIME) {
for (i=1; i < 16; i++) {
info = IRQ_ports[i];
if (!info)
continue;
cli();
#ifdef CONFIG_SERIAL_SHARE_IRQ
if (info->next_port) {
do {
serial_out(info, UART_IER, 0);
info->IER |= UART_IER_THRI;
serial_out(info, UART_IER, info->IER);
info = info->next_port;
} while (info);
#ifdef CONFIG_SERIAL_MULTIPORT
if (rs_multiport[i].port1)
rs_interrupt_multi(i, NULL, NULL);
else
#endif
rs_interrupt(i, NULL, NULL);
} else
#endif /* CONFIG_SERIAL_SHARE_IRQ */
rs_interrupt_single(i, NULL, NULL);
sti();
}
}
last_strobe = jiffies;
timer_table[RS_TIMER].expires = jiffies + RS_STROBE_TIME;
timer_active |= 1 << RS_TIMER;
if (IRQ_ports[0]) {
cli();
#ifdef CONFIG_SERIAL_SHARE_IRQ
rs_interrupt(0, NULL, NULL);
#else
rs_interrupt_single(0, NULL, NULL);
#endif
sti();
timer_table[RS_TIMER].expires = jiffies + IRQ_timeout[0] - 2;
}
}
/*
* ---------------------------------------------------------------
* 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.
* ---------------------------------------------------------------
*/
static int startup(struct async_struct * info)
{
unsigned long flags;
int retval=0;
void (*handler)(int, void *, struct pt_regs *);
struct serial_state *state= info->state;
unsigned long page;
page = get_free_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
save_flags(flags); cli();
if (info->flags & ASYNC_INITIALIZED) {
free_page(page);
goto errout;
}
if (!state->port || !state->type) {
if (info->tty)
set_bit(TTY_IO_ERROR, &info->tty->flags);
free_page(page);
goto errout;
}
if (info->xmit_buf)
free_page(page);
else
info->xmit_buf = (unsigned char *) page;
#ifdef SERIAL_DEBUG_OPEN
printk("starting up ttys%d (irq %d)...", info->line, state->irq);
#endif
if (uart_config[info->state->type].flags & UART_STARTECH) {
/* Wake up UART */
serial_outp(info, UART_LCR, 0xBF);
serial_outp(info, UART_EFR, UART_EFR_ECB);
serial_outp(info, UART_IER, 0);
serial_outp(info, UART_EFR, 0);
serial_outp(info, UART_LCR, 0);
}
if (info->state->type == PORT_16750) {
/* Wake up UART */
serial_outp(info, UART_IER, 0);
}
/*
* Clear the FIFO buffers and disable them
* (they will be reenabled in change_speed())
*/
if (uart_config[state->type].flags & UART_CLEAR_FIFO)
serial_outp(info, UART_FCR, (UART_FCR_CLEAR_RCVR |
UART_FCR_CLEAR_XMIT));
/*
* At this point there's no way the LSR could still be 0xFF;
* if it is, then bail out, because there's likely no UART
* here.
*/
if (serial_inp(info, UART_LSR) == 0xff) {
if (suser()) {
if (info->tty)
set_bit(TTY_IO_ERROR, &info->tty->flags);
} else
retval = -ENODEV;
goto errout;
}
/*
* Allocate the IRQ if necessary
*/
if (state->irq && (!IRQ_ports[state->irq] ||
!IRQ_ports[state->irq]->next_port)) {
if (IRQ_ports[state->irq]) {
retval = -EBUSY;
goto errout;
} else
handler = rs_interrupt_single;
retval = request_irq(state->irq, handler, IRQ_T(info),
"serial", NULL);
if (retval) {
if (suser()) {
if (info->tty)
set_bit(TTY_IO_ERROR,
&info->tty->flags);
retval = 0;
}
goto errout;
}
}
/*
* Insert serial port into IRQ chain.
*/
info->prev_port = 0;
info->next_port = IRQ_ports[state->irq];
if (info->next_port)
info->next_port->prev_port = info;
IRQ_ports[state->irq] = info;
figure_IRQ_timeout(state->irq);
/*
* Clear the interrupt registers.
*/
/* (void) serial_inp(info, UART_LSR); */ /* (see above) */
(void) serial_inp(info, UART_RX);
(void) serial_inp(info, UART_IIR);
(void) serial_inp(info, UART_MSR);
/*
* Now, initialize the UART
*/
serial_outp(info, UART_LCR, UART_LCR_WLEN8); /* reset DLAB */
info->MCR = 0;
if (info->tty->termios->c_cflag & CBAUD)
info->MCR = UART_MCR_DTR | UART_MCR_RTS;
{
if (state->irq != 0)
info->MCR |= UART_MCR_OUT2;
}
#if defined(__alpha__) && !defined(CONFIG_PCI)
/*
* DEC did something gratutiously wrong....
*/
info->MCR |= UART_MCR_OUT1 | UART_MCR_OUT2;
#endif
serial_outp(info, UART_MCR, info->MCR);
/*
* Finally, enable interrupts
*/
info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
serial_outp(info, UART_IER, info->IER); /* enable interrupts */
/*
* And clear the interrupt registers again for luck.
*/
(void)serial_inp(info, UART_LSR);
(void)serial_inp(info, UART_RX);
(void)serial_inp(info, UART_IIR);
(void)serial_inp(info, UART_MSR);
if (info->tty)
clear_bit(TTY_IO_ERROR, &info->tty->flags);
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
/*
* Set up serial timers...
*/
timer_table[RS_TIMER].expires = jiffies + 2*HZ/100;
timer_active |= 1 << RS_TIMER;
/*
* 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;
}
/*
* and set the speed of the serial port
*/
change_speed(info);
info->flags |= ASYNC_INITIALIZED;
restore_flags(flags);
return 0;
errout:
restore_flags(flags);
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 async_struct * info)
{
unsigned long flags;
struct serial_state *state;
int retval;
if (!(info->flags & ASYNC_INITIALIZED))
return;
state = info->state;
#ifdef SERIAL_DEBUG_OPEN
printk("Shutting down serial port %d (irq %d)....", info->line,
state->irq);
#endif
save_flags(flags); cli(); /* Disable interrupts */
/*
* 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);
/*
* First unlink the serial port from the IRQ chain...
*/
if (info->next_port)
info->next_port->prev_port = info->prev_port;
if (info->prev_port)
info->prev_port->next_port = info->next_port;
else
IRQ_ports[state->irq] = info->next_port;
figure_IRQ_timeout(state->irq);
if (info->xmit_buf) {
free_page((unsigned long) info->xmit_buf);
info->xmit_buf = 0;
}
info->IER = 0;
serial_outp(info, UART_IER, 0x00); /* disable all intrs */
info->MCR &= ~UART_MCR_OUT2;
#if defined(__alpha__) && !defined(CONFIG_PCI)
/*
* DEC did something gratutiously wrong....
*/
info->MCR |= UART_MCR_OUT1 | UART_MCR_OUT2;
#endif
/* disable break condition */
serial_out(info, UART_LCR, serial_inp(info, UART_LCR) & ~UART_LCR_SBC);
if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
serial_outp(info, UART_MCR, info->MCR);
/* disable FIFO's */
serial_outp(info, UART_FCR, (UART_FCR_CLEAR_RCVR |
UART_FCR_CLEAR_XMIT));
(void)serial_in(info, UART_RX); /* read data port to reset things */
if (info->tty)
set_bit(TTY_IO_ERROR, &info->tty->flags);
if (uart_config[info->state->type].flags & UART_STARTECH) {
/* Arrange to enter sleep mode */
serial_outp(info, UART_LCR, 0xBF);
serial_outp(info, UART_EFR, UART_EFR_ECB);
serial_outp(info, UART_IER, UART_IERX_SLEEP);
serial_outp(info, UART_LCR, 0);
}
if (info->state->type == PORT_16750) {
/* Arrange to enter sleep mode */
serial_outp(info, UART_IER, UART_IERX_SLEEP);
}
info->flags &= ~ASYNC_INITIALIZED;
restore_flags(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 async_struct *info)
{
unsigned short port;
int quot = 0, baud_base, baud;
unsigned cflag, cval, fcr = 0;
int bits;
unsigned long flags;
if (!info->tty || !info->tty->termios)
return;
cflag = info->tty->termios->c_cflag;
if (!(port = info->port))
return;
/* 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;
/* Never happens, but GCC is too dumb to figure it out */
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
/* Determine divisor based on baud rate */
baud = tty_get_baud_rate(info->tty);
baud_base = info->state->baud_base;
if (baud == 38400 &&
((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
quot = info->state->custom_divisor;
else {
if (baud == 134)
/* Special case since 134 is really 134.5 */
quot = (2*baud_base / 269);
else if (baud)
quot = baud_base / baud;
}
/* If the quotient is ever zero, default to 9600 bps */
if (!quot)
quot = baud_base / 9600;
info->quot = quot;
info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
info->timeout += HZ/50; /* Add .02 seconds of slop */
/* Set up FIFO's */
if (uart_config[info->state->type].flags & UART_USE_FIFO) {
if ((info->state->baud_base / quot) < 2400)
fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
else
fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8;
}
if (info->state->type == PORT_16750)
fcr |= UART_FCR7_64BYTE;
/* CTS flow control flag and modem status interrupts */
info->IER &= ~UART_IER_MSI;
if (info->flags & ASYNC_HARDPPS_CD)
info->IER |= UART_IER_MSI;
if (cflag & CRTSCTS) {
info->flags |= ASYNC_CTS_FLOW;
info->IER |= UART_IER_MSI;
} 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;
}
serial_out(info, UART_IER, info->IER);
/*
* Set up parity check flag
*/
#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
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;
/*
* Characters to ignore
*/
info->ignore_status_mask = 0;
if (I_IGNPAR(info->tty))
info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
if (I_IGNBRK(info->tty)) {
info->ignore_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;
}
/*
* !!! ignore all characters if CREAD is not set
*/
if ((cflag & CREAD) == 0)
info->ignore_status_mask |= UART_LSR_DR;
save_flags(flags); cli();
if (uart_config[info->state->type].flags & UART_STARTECH) {
serial_outp(info, UART_LCR, 0xBF);
serial_outp(info, UART_EFR,
(cflag & CRTSCTS) ? UART_EFR_CTS : 0);
}
serial_outp(info, UART_LCR, cval | UART_LCR_DLAB); /* set DLAB */
serial_outp(info, UART_DLL, quot & 0xff); /* LS of divisor */
serial_outp(info, UART_DLM, quot >> 8); /* MS of divisor */
if (info->state->type == PORT_16750)
serial_outp(info, UART_FCR, fcr); /* set fcr */
serial_outp(info, UART_LCR, cval); /* reset DLAB */
if (info->state->type != PORT_16750)
serial_outp(info, UART_FCR, fcr); /* set fcr */
restore_flags(flags);
}
static void rs_put_char(struct tty_struct *tty, unsigned char ch)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_put_char"))
return;
if (!tty || !info->xmit_buf)
return;
save_flags(flags); cli();
if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1) {
restore_flags(flags);
return;
}
info->xmit_buf[info->xmit_head++] = ch;
info->xmit_head &= SERIAL_XMIT_SIZE-1;
info->xmit_cnt++;
restore_flags(flags);
}
static void rs_flush_chars(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_flush_chars"))
return;
if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
!info->xmit_buf)
return;
save_flags(flags); cli();
info->IER |= UART_IER_THRI;
serial_out(info, UART_IER, info->IER);
restore_flags(flags);
}
static int rs_write(struct tty_struct * tty, int from_user,
const unsigned char *buf, int count)
{
int c, ret = 0;
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_write"))
return 0;
if (!tty || !info->xmit_buf || !tmp_buf)
return 0;
if (from_user)
down(&tmp_buf_sem);
save_flags(flags);
while (1) {
cli();
c = MIN(count, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
SERIAL_XMIT_SIZE - info->xmit_head));
if (c <= 0)
break;
if (from_user) {
c -= copy_from_user(tmp_buf, buf, c);
if (!c) {
if (!ret)
ret = -EFAULT;
break;
}
c = MIN(c, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
SERIAL_XMIT_SIZE - info->xmit_head));
memcpy(info->xmit_buf + info->xmit_head, tmp_buf, c);
} else
memcpy(info->xmit_buf + info->xmit_head, buf, c);
info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
info->xmit_cnt += c;
restore_flags(flags);
buf += c;
count -= c;
ret += c;
}
if (from_user)
up(&tmp_buf_sem);
if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped &&
!(info->IER & UART_IER_THRI)) {
info->IER |= UART_IER_THRI;
serial_out(info, UART_IER, info->IER);
}
restore_flags(flags);
return ret;
}
static int rs_write_room(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
int ret;
if (serial_paranoia_check(info, tty->device, "rs_write_room"))
return 0;
ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
if (ret < 0)
ret = 0;
return ret;
}
static int rs_chars_in_buffer(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer"))
return 0;
return info->xmit_cnt;
}
static void rs_flush_buffer(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
if (serial_paranoia_check(info, tty->device, "rs_flush_buffer"))
return;
cli();
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
sti();
wake_up_interruptible(&tty->write_wait);
if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
tty->ldisc.write_wakeup)
(tty->ldisc.write_wakeup)(tty);
}
/*
* This function is used to send a high-priority XON/XOFF character to
* the device
*/
static void rs_send_xchar(struct tty_struct *tty, char ch)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
if (serial_paranoia_check(info, tty->device, "rs_send_char"))
return;
info->x_char = ch;
if (ch) {
/* Make sure transmit interrupts are on */
info->IER |= UART_IER_THRI;
serial_out(info, UART_IER, info->IER);
}
}
/*
* ------------------------------------------------------------
* 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 async_struct *info = (struct async_struct *)tty->driver_data;
#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->device, "rs_throttle"))
return;
if (I_IXOFF(tty))
rs_send_xchar(tty, STOP_CHAR(tty));
if (tty->termios->c_cflag & CRTSCTS)
info->MCR &= ~UART_MCR_RTS;
cli();
serial_out(info, UART_MCR, info->MCR);
sti();
}
static void rs_unthrottle(struct tty_struct * tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
#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->device, "rs_unthrottle"))
return;
if (I_IXOFF(tty)) {
if (info->x_char)
info->x_char = 0;
else
rs_send_xchar(tty, START_CHAR(tty));
}
if (tty->termios->c_cflag & CRTSCTS)
info->MCR |= UART_MCR_RTS;
cli();
serial_out(info, UART_MCR, info->MCR);
sti();
}
/*
* ------------------------------------------------------------
* rs_ioctl() and friends
* ------------------------------------------------------------
*/
static int get_serial_info(struct async_struct * info,
struct serial_struct * retinfo)
{
struct serial_struct tmp;
struct serial_state *state = info->state;
if (!retinfo)
return -EFAULT;
memset(&tmp, 0, sizeof(tmp));
tmp.type = state->type;
tmp.line = state->line;
tmp.port = state->port;
tmp.irq = state->irq;
tmp.flags = state->flags;
tmp.xmit_fifo_size = state->xmit_fifo_size;
tmp.baud_base = state->baud_base;
tmp.close_delay = state->close_delay;
tmp.closing_wait = state->closing_wait;
tmp.custom_divisor = state->custom_divisor;
tmp.hub6 = state->hub6;
if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
return -EFAULT;
return 0;
}
static int set_serial_info(struct async_struct * info,
struct serial_struct * new_info)
{
struct serial_struct new_serial;
struct serial_state old_state, *state;
unsigned int i,change_irq,change_port;
int retval = 0;
if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
return -EFAULT;
state = info->state;
old_state = *state;
change_irq = new_serial.irq != state->irq;
change_port = (new_serial.port != state->port) ||
(new_serial.hub6 != state->hub6);
if (!suser()) {
if (change_irq || change_port ||
(new_serial.baud_base != state->baud_base) ||
(new_serial.type != state->type) ||
(new_serial.close_delay != state->close_delay) ||
(new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
((new_serial.flags & ~ASYNC_USR_MASK) !=
(state->flags & ~ASYNC_USR_MASK)))
return -EPERM;
state->flags = ((state->flags & ~ASYNC_USR_MASK) |
(new_serial.flags & ASYNC_USR_MASK));
state->custom_divisor = new_serial.custom_divisor;
goto check_and_exit;
}
if (new_serial.irq == 2)
new_serial.irq = 9;
if ((new_serial.irq > 15) || (new_serial.port > 0xffff) ||
(new_serial.type < PORT_UNKNOWN) || (new_serial.type > PORT_MAX)) {
return -EINVAL;
}
/* Make sure address is not already in use */
if (new_serial.type) {
for (i = 0 ; i < NR_PORTS; i++)
if ((state != &rs_table[i]) &&
(rs_table[i].port == new_serial.port) &&
rs_table[i].type)
return -EADDRINUSE;
}
if ((change_port || change_irq) && (state->count > 1))
return -EBUSY;
/*
* OK, past this point, all the error checking has been done.
* At this point, we start making changes.....
*/
state->baud_base = new_serial.baud_base;
state->flags = ((state->flags & ~ASYNC_FLAGS) |
(new_serial.flags & ASYNC_FLAGS));
info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
(info->flags & ASYNC_INTERNAL_FLAGS));
state->custom_divisor = new_serial.custom_divisor;
state->type = new_serial.type;
state->close_delay = new_serial.close_delay * HZ/100;
state->closing_wait = new_serial.closing_wait * HZ/100;
info->xmit_fifo_size = state->xmit_fifo_size =
new_serial.xmit_fifo_size;
release_region(state->port,8);
if (change_port || change_irq) {
/*
* We need to shutdown the serial port at the old
* port/irq combination.
*/
shutdown(info);
state->irq = new_serial.irq;
info->port = state->port = new_serial.port;
info->hub6 = state->hub6 = new_serial.hub6;
}
if (state->type != PORT_UNKNOWN)
request_region(state->port,8,"serial(set)");
check_and_exit:
if (!state->port || !state->type)
return 0;
if (state->type != old_state.type)
info->xmit_fifo_size = state->xmit_fifo_size =
uart_config[state->type].dfl_xmit_fifo_size;
if (state->flags & ASYNC_INITIALIZED) {
if (((old_state.flags & ASYNC_SPD_MASK) !=
(state->flags & ASYNC_SPD_MASK)) ||
(old_state.custom_divisor != state->custom_divisor)) {
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
info->tty->alt_speed = 57600;
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
info->tty->alt_speed = 115200;
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
info->tty->alt_speed = 230400;
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
info->tty->alt_speed = 460800;
change_speed(info);
}
} else
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 async_struct * info, unsigned int *value)
{
unsigned char status;
unsigned int result;
cli();
status = serial_in(info, UART_LSR);
sti();
result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
return put_user(result,value);
}
static int get_modem_info(struct async_struct * info, unsigned int *value)
{
unsigned char control, status;
unsigned int result;
control = info->MCR;
cli();
status = serial_in(info, UART_MSR);
sti();
result = ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
| ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
#ifdef TIOCM_OUT1
| ((control & UART_MCR_OUT1) ? TIOCM_OUT1 : 0)
| ((control & UART_MCR_OUT2) ? TIOCM_OUT2 : 0)
#endif
| ((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);
return put_user(result,value);
}
static int set_modem_info(struct async_struct * info, unsigned int cmd,
unsigned int *value)
{
int error;
unsigned int arg;
error = get_user(arg, value);
if (error)
return error;
switch (cmd) {
case TIOCMBIS:
if (arg & TIOCM_RTS)
info->MCR |= UART_MCR_RTS;
if (arg & TIOCM_DTR)
info->MCR |= UART_MCR_DTR;
#ifdef TIOCM_OUT1
if (arg & TIOCM_OUT1)
info->MCR |= UART_MCR_OUT1;
if (arg & TIOCM_OUT2)
info->MCR |= UART_MCR_OUT2;
#endif
break;
case TIOCMBIC:
if (arg & TIOCM_RTS)
info->MCR &= ~UART_MCR_RTS;
if (arg & TIOCM_DTR)
info->MCR &= ~UART_MCR_DTR;
#ifdef TIOCM_OUT1
if (arg & TIOCM_OUT1)
info->MCR &= ~UART_MCR_OUT1;
if (arg & TIOCM_OUT2)
info->MCR &= ~UART_MCR_OUT2;
#endif
break;
case TIOCMSET:
info->MCR = ((info->MCR & ~(UART_MCR_RTS |
#ifdef TIOCM_OUT1
UART_MCR_OUT1 |
UART_MCR_OUT2 |
#endif
UART_MCR_DTR))
| ((arg & TIOCM_RTS) ? UART_MCR_RTS : 0)
#ifdef TIOCM_OUT1
| ((arg & TIOCM_OUT1) ? UART_MCR_OUT1 : 0)
| ((arg & TIOCM_OUT2) ? UART_MCR_OUT2 : 0)
#endif
| ((arg & TIOCM_DTR) ? UART_MCR_DTR : 0));
break;
default:
return -EINVAL;
}
cli();
serial_out(info, UART_MCR, info->MCR);
sti();
return 0;
}
/*
* rs_break() --- routine which turns the break handling on or off
*/
static void rs_break(struct tty_struct *tty, int break_state)
{
struct async_struct * info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_break"))
return;
if (!info->port)
return;
save_flags(flags); cli();
if (break_state == -1)
serial_out(info, UART_LCR,
serial_inp(info, UART_LCR) | UART_LCR_SBC);
else
serial_out(info, UART_LCR,
serial_inp(info, UART_LCR) & ~UART_LCR_SBC);
restore_flags(flags);
}
static int rs_ioctl(struct tty_struct *tty, struct file * file,
unsigned int cmd, unsigned long arg)
{
int error;
struct async_struct * info = (struct async_struct *)tty->driver_data;
struct async_icount cprev, cnow; /* kernel counter temps */
struct serial_icounter_struct *p_cuser; /* user space */
if (serial_paranoia_check(info, tty->device, "rs_ioctl"))
return -ENODEV;
if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
(cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
(cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT) &&
(cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
if (tty->flags & (1 << TTY_IO_ERROR))
return -EIO;
}
switch (cmd) {
case TIOCMGET:
return get_modem_info(info, (unsigned int *) arg);
case TIOCMBIS:
case TIOCMBIC:
case TIOCMSET:
return set_modem_info(info, cmd, (unsigned int *) arg);
case TIOCGSERIAL:
return get_serial_info(info,
(struct serial_struct *) arg);
case TIOCSSERIAL:
return set_serial_info(info,
(struct serial_struct *) arg);
case TIOCSERCONFIG:
return do_autoconfig(info);
case TIOCSERGWILD:
return put_user(rs_wild_int_mask,
(unsigned int *) arg);
case TIOCSERGETLSR: /* Get line status register */
return get_lsr_info(info, (unsigned int *) arg);
case TIOCSERSWILD:
if (!suser())
return -EPERM;
error = get_user(rs_wild_int_mask,
(unsigned int *) arg);
if (error)
return error;
if (rs_wild_int_mask < 0)
rs_wild_int_mask = check_wild_interrupts(0);
return 0;
case TIOCSERGSTRUCT:
if (copy_to_user((struct async_struct *) arg,
info, sizeof(struct async_struct)))
return -EFAULT;
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:
cli();
/* note the counters on entry */
cprev = info->state->icount;
sti();
while (1) {
interruptible_sleep_on(&info->delta_msr_wait);
/* see if a signal did it */
if (signal_pending(current))
return -ERESTARTSYS;
cli();
cnow = info->state->icount; /* atomic copy */
sti();
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:
cli();
cnow = info->state->icount;
sti();
p_cuser = (struct serial_icounter_struct *) arg;
error = put_user(cnow.cts, &p_cuser->cts);
if (error) return error;
error = put_user(cnow.dsr, &p_cuser->dsr);
if (error) return error;
error = put_user(cnow.rng, &p_cuser->rng);
if (error) return error;
error = put_user(cnow.dcd, &p_cuser->dcd);
if (error) return error;
return 0;
default:
return -ENOIOCTLCMD;
}
return 0;
}
static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
if ( (tty->termios->c_cflag == old_termios->c_cflag)
&& ( RELEVANT_IFLAG(tty->termios->c_iflag)
== RELEVANT_IFLAG(old_termios->c_iflag)))
return;
change_speed(info);
/* Handle transition to B0 status */
if ((old_termios->c_cflag & CBAUD) &&
!(tty->termios->c_cflag & CBAUD)) {
info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
cli();
serial_out(info, UART_MCR, info->MCR);
sti();
}
/* Handle transition away from B0 status */
if (!(old_termios->c_cflag & CBAUD) &&
(tty->termios->c_cflag & CBAUD)) {
info->MCR |= UART_MCR_DTR;
if (!(tty->termios->c_cflag & CRTSCTS) ||
!test_bit(TTY_THROTTLED, &tty->flags)) {
info->MCR |= UART_MCR_RTS;
}
cli();
serial_out(info, UART_MCR, info->MCR);
sti();
}
/* Handle turning off CRTSCTS */
if ((old_termios->c_cflag & CRTSCTS) &&
!(tty->termios->c_cflag & CRTSCTS)) {
tty->hw_stopped = 0;
rs_start(tty);
}
#if 0
/*
* No need to wake up processes in open wait, since they
* sample the CLOCAL flag once, and don't recheck it.
* XXX It's not clear whether the current behavior is correct
* or not. Hence, this may change.....
*/
if (!(old_termios->c_cflag & CLOCAL) &&
(tty->termios->c_cflag & CLOCAL))
wake_up_interruptible(&info->open_wait);
#endif
}
/*
* ------------------------------------------------------------
* 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 async_struct * info = (struct async_struct *)tty->driver_data;
struct serial_state *state;
unsigned long flags;
if (!info || serial_paranoia_check(info, tty->device, "rs_close"))
return;
state = info->state;
save_flags(flags); cli();
if (tty_hung_up_p(filp)) {
DBG_CNT("before DEC-hung");
MOD_DEC_USE_COUNT;
restore_flags(flags);
return;
}
#ifdef SERIAL_DEBUG_OPEN
printk("rs_close ttys%d, count = %d\n", info->line, state->count);
#endif
if ((tty->count == 1) && (state->count != 1)) {
/*
* Uh, oh. tty->count is 1, which means that the tty
* structure will be freed. state->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, "
"state->count is %d\n", state->count);
state->count = 1;
}
if (--state->count < 0) {
printk("rs_close: bad serial port count for ttys%d: %d\n",
info->line, state->count);
state->count = 0;
}
if (state->count) {
DBG_CNT("before DEC-2");
MOD_DEC_USE_COUNT;
restore_flags(flags);
return;
}
info->flags |= ASYNC_CLOSING;
/*
* Save the termios structure, since this port may have
* separate termios for callout and dialin.
*/
if (info->flags & ASYNC_NORMAL_ACTIVE)
info->state->normal_termios = *tty->termios;
if (info->flags & ASYNC_CALLOUT_ACTIVE)
info->state->callout_termios = *tty->termios;
/*
* 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->read_status_mask &= ~UART_LSR_DR;
if (info->flags & ASYNC_INITIALIZED) {
serial_out(info, UART_IER, info->IER);
/*
* 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);
if (tty->ldisc.flush_buffer)
tty->ldisc.flush_buffer(tty);
tty->closing = 0;
info->event = 0;
info->tty = 0;
if (info->blocked_open) {
if (info->close_delay) {
current->state = TASK_INTERRUPTIBLE;
current->timeout = jiffies + info->close_delay;
schedule();
}
wake_up_interruptible(&info->open_wait);
}
info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
ASYNC_CLOSING);
wake_up_interruptible(&info->close_wait);
MOD_DEC_USE_COUNT;
restore_flags(flags);
}
/*
* rs_wait_until_sent() --- wait until the transmitter is empty
*/
static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
{
struct async_struct * info = (struct async_struct *)tty->driver_data;
unsigned long orig_jiffies, char_time;
int lsr;
if (serial_paranoia_check(info, tty->device, "rs_wait_until_sent"))
return;
if (info->state->type == PORT_UNKNOWN)
return;
orig_jiffies = jiffies;
/*
* Set the check interval to be 1/5 of the estimated time to
* send a single character, and make it at least 1. The check
* interval should also be less than the timeout.
*
* Note: we have to use pretty tight timings here to satisfy
* the NIST-PCTS.
*/
char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
char_time = char_time / 5;
if (char_time == 0)
char_time = 1;
if (timeout)
char_time = MIN(char_time, timeout);
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
printk("jiff=%lu...", jiffies);
#endif
while (!((lsr = serial_inp(info, UART_LSR)) & UART_LSR_TEMT)) {
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
#endif
current->state = TASK_INTERRUPTIBLE;
current->counter = 0; /* make us low-priority */
current->timeout = jiffies + char_time;
schedule();
if (signal_pending(current))
break;
if (timeout && ((orig_jiffies + timeout) < jiffies))
break;
}
current->state = TASK_RUNNING;
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
#endif
}
/*
* rs_hangup() --- called by tty_hangup() when a hangup is signaled.
*/
static void rs_hangup(struct tty_struct *tty)
{
struct async_struct * info = (struct async_struct *)tty->driver_data;
struct serial_state *state = info->state;
if (serial_paranoia_check(info, tty->device, "rs_hangup"))
return;
state = info->state;
rs_flush_buffer(tty);
shutdown(info);
info->event = 0;
state->count = 0;
info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
info->tty = 0;
wake_up_interruptible(&info->open_wait);
}
/*
* ------------------------------------------------------------
* rs_open() and friends
* ------------------------------------------------------------
*/
static int block_til_ready(struct tty_struct *tty, struct file * filp,
struct async_struct *info)
{
struct wait_queue wait = { current, NULL };
struct serial_state *state = info->state;
int retval;
int do_clocal = 0;
/*
* 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
return ((info->flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS);
#else
return -EAGAIN;
#endif
}
/*
* If this is a callout device, then just make sure the normal
* device isn't being used.
*/
if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
if (info->flags & ASYNC_NORMAL_ACTIVE)
return -EBUSY;
if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
(info->flags & ASYNC_SESSION_LOCKOUT) &&
(info->session != current->session))
return -EBUSY;
if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
(info->flags & ASYNC_PGRP_LOCKOUT) &&
(info->pgrp != current->pgrp))
return -EBUSY;
info->flags |= ASYNC_CALLOUT_ACTIVE;
return 0;
}
/*
* 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))) {
if (info->flags & ASYNC_CALLOUT_ACTIVE)
return -EBUSY;
info->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
if (info->flags & ASYNC_CALLOUT_ACTIVE) {
if (state->normal_termios.c_cflag & CLOCAL)
do_clocal = 1;
} else {
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, state->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",
state->line, state->count);
#endif
cli();
if (!tty_hung_up_p(filp))
state->count--;
sti();
info->blocked_open++;
while (1) {
cli();
if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
(tty->termios->c_cflag & CBAUD))
serial_out(info, UART_MCR,
serial_inp(info, UART_MCR) |
(UART_MCR_DTR | UART_MCR_RTS));
sti();
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;
}
if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
!(info->flags & ASYNC_CLOSING) &&
(do_clocal || (serial_in(info, UART_MSR) &
UART_MSR_DCD)))
break;
if (signal_pending(current)) {
retval = -ERESTARTSYS;
break;
}
#ifdef SERIAL_DEBUG_OPEN
printk("block_til_ready blocking: ttys%d, count = %d\n",
info->line, state->count);
#endif
schedule();
}
current->state = TASK_RUNNING;
remove_wait_queue(&info->open_wait, &wait);
if (!tty_hung_up_p(filp))
state->count++;
info->blocked_open--;
#ifdef SERIAL_DEBUG_OPEN
printk("block_til_ready after blocking: ttys%d, count = %d\n",
info->line, state->count);
#endif
if (retval)
return retval;
info->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
static int get_async_struct(int line, struct async_struct **ret_info)
{
struct async_struct *info;
struct serial_state *sstate;
sstate = rs_table + line;
sstate->count++;
if (sstate->info) {
*ret_info = sstate->info;
return 0;
}
info = kmalloc(sizeof(struct async_struct), GFP_KERNEL);
if (!info) {
sstate->count--;
return -ENOMEM;
}
memset(info, 0, sizeof(struct async_struct));
info->magic = SERIAL_MAGIC;
info->port = sstate->port;
info->flags = sstate->flags;
info->xmit_fifo_size = sstate->xmit_fifo_size;
info->line = line;
info->tqueue.routine = do_softint;
info->tqueue.data = info;
info->state = sstate;
if (sstate->info) {
kfree_s(info, sizeof(struct async_struct));
*ret_info = sstate->info;
return 0;
}
*ret_info = sstate->info = info;
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 rs_open(struct tty_struct *tty, struct file * filp)
{
struct async_struct *info;
int retval, line;
unsigned long page;
line = MINOR(tty->device) - tty->driver.minor_start;
if ((line < 0) || (line >= NR_PORTS))
return -ENODEV;
retval = get_async_struct(line, &info);
if (retval)
return retval;
if (serial_paranoia_check(info, tty->device, "rs_open"))
return -ENODEV;
#ifdef SERIAL_DEBUG_OPEN
printk("rs_open %s%d, count = %d\n", tty->driver.name, info->line,
info->state->count);
#endif
tty->driver_data = info;
info->tty = tty;
if (!tmp_buf) {
page = get_free_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
if (tmp_buf)
free_page(page);
else
tmp_buf = (unsigned char *) page;
}
/*
* If the port is the middle of closing, bail out now
*/
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
return ((info->flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS);
#else
return -EAGAIN;
#endif
}
/*
* Start up serial port
*/
retval = startup(info);
if (retval)
return retval;
MOD_INC_USE_COUNT;
retval = block_til_ready(tty, filp, info);
if (retval) {
#ifdef SERIAL_DEBUG_OPEN
printk("rs_open returning after block_til_ready with %d\n",
retval);
#endif
return retval;
}
if ((info->state->count == 1) &&
(info->flags & ASYNC_SPLIT_TERMIOS)) {
if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
*tty->termios = info->state->normal_termios;
else
*tty->termios = info->state->callout_termios;
change_speed(info);
}
info->session = current->session;
info->pgrp = current->pgrp;
#ifdef SERIAL_DEBUG_OPEN
printk("rs_open ttys%d successful...", info->line);
#endif
return 0;
}
/*
* /proc fs routines....
*/
static int inline line_info(char *buf, struct serial_state *state)
{
struct async_struct *info = state->info, scr_info;
char stat_buf[30], control, status;
int ret;
ret = sprintf(buf, "%d: uart:%s port:%X irq:%d",
state->line, uart_config[state->type].name,
state->port, state->irq);
if (!state->port || (state->type == PORT_UNKNOWN)) {
ret += sprintf(buf+ret, "\n");
return ret;
}
/*
* Figure out the current RS-232 lines
*/
if (!info) {
info = &scr_info; /* This is just for serial_{in,out} */
info->magic = SERIAL_MAGIC;
info->port = state->port;
info->flags = state->flags;
info->quot = 0;
info->tty = 0;
}
cli();
status = serial_in(info, UART_MSR);
control = info ? info->MCR : serial_in(info, UART_MCR);
sti();
stat_buf[0] = 0;
stat_buf[1] = 0;
if (control & UART_MCR_RTS)
strcat(stat_buf, "|RTS");
if (status & UART_MSR_CTS)
strcat(stat_buf, "|CTS");
if (control & UART_MCR_DTR)
strcat(stat_buf, "|DTR");
if (status & UART_MSR_DSR)
strcat(stat_buf, "|DSR");
if (status & UART_MSR_DCD)
strcat(stat_buf, "|CD");
if (status & UART_MSR_RI)
strcat(stat_buf, "|RI");
if (info->quot) {
ret += sprintf(buf+ret, " baud:%d",
state->baud_base / info->quot);
}
ret += sprintf(buf+ret, " tx:%d rx:%d",
state->icount.tx, state->icount.rx);
if (state->icount.frame)
ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
if (state->icount.parity)
ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
if (state->icount.brk)
ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
if (state->icount.overrun)
ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
/*
* Last thing is the RS-232 status lines
*/
ret += sprintf(buf+ret, " %s\n", stat_buf+1);
return ret;
}
int rs_read_proc(char *page, char **start, off_t off, int count,
int *eof, void *data)
{
int i, len = 0;
off_t begin = 0;
len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
for (i = 0; i < NR_PORTS && len < 4000; i++) {
len += line_info(page + len, &rs_table[i]);
if (len+begin > off+count)
goto done;
if (len+begin < off) {
begin += len;
len = 0;
}
}
*eof = 1;
done:
if (off >= len+begin)
return 0;
*start = page + (begin-off);
return ((count < begin+len-off) ? count : begin+len-off);
}
/*
* ---------------------------------------------------------------------
* rs_init() and friends
*
* rs_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 "ISDN %s version %s enabled", serial_name, serial_version);
}
/*
* This routine is called by rs_init() to initialize a specific serial
* port. It determines what type of UART chip this serial port is
* using: 8250, 16450, 16550, 16550A. The important question is
* whether or not this UART is a 16550A or not, since this will
* determine whether or not we can use its FIFO features or not.
*/
static void autoconfig(struct serial_state * state)
{
unsigned char status1, status2, scratch, scratch2;
struct async_struct *info, scr_info;
unsigned long flags;
state->type = PORT_UNKNOWN;
if (!state->port)
return;
info = &scr_info; /* This is just for serial_{in,out} */
info->magic = SERIAL_MAGIC;
info->port = state->port;
info->flags = state->flags;
save_flags(flags); cli();
/*
* Do a simple existence test first; if we fail this, there's
* no point trying anything else.
*
* 0x80 is used as a nonsense port to prevent against false
* positives due to ISA bus float. The assumption is that
* 0x80 is a non-existent port; which should be safe since
* include/asm/io.h also makes this assumption.
*/
scratch = serial_inp(info, UART_IER);
serial_outp(info, UART_IER, 0);
outb(0xff, 0x080);
scratch2 = serial_inp(info, UART_IER);
serial_outp(info, UART_IER, scratch);
if (scratch2) {
restore_flags(flags);
return; /* We failed; there's nothing here */
}
/*
* Check to see if a UART is really there. Certain broken
* internal modems based on the Rockwell chipset fail this
* test, because they apparently don't implement the loopback
* test mode. So this test is skipped on the COM 1 through
* COM 4 ports. This *should* be safe, since no board
* manufacturer would be stupid enough to design a board
* that conflicts with COM 1-4 --- we hope!
*/
if (!(state->flags & ASYNC_SKIP_TEST)) {
scratch = serial_inp(info, UART_MCR);
serial_outp(info, UART_MCR, UART_MCR_LOOP | scratch);
scratch2 = serial_inp(info, UART_MSR);
serial_outp(info, UART_MCR, UART_MCR_LOOP | 0x0A);
status1 = serial_inp(info, UART_MSR) & 0xF0;
serial_outp(info, UART_MCR, scratch);
serial_outp(info, UART_MSR, scratch2);
if (status1 != 0x90) {
restore_flags(flags);
return;
}
}
/*
* If the AUTO_IRQ flag is set, try to do the automatic IRQ
* detection.
*/
if (state->flags & ASYNC_AUTO_IRQ)
state->irq = do_auto_irq(info);
scratch2 = serial_in(info, UART_LCR);
serial_outp(info, UART_LCR, 0xBF); /* set up for StarTech test */
serial_outp(info, UART_EFR, 0); /* EFR is the same as FCR */
serial_outp(info, UART_LCR, 0);
serial_outp(info, UART_FCR, UART_FCR_ENABLE_FIFO);
scratch = serial_in(info, UART_IIR) >> 6;
switch (scratch) {
case 0:
state->type = PORT_16450;
break;
case 1:
state->type = PORT_UNKNOWN;
break;
case 2:
state->type = PORT_16550;
break;
case 3:
state->type = PORT_16550A;
break;
}
if (state->type == PORT_16550A) {
/* Check for Startech UART's */
serial_outp(info, UART_LCR, scratch2 | UART_LCR_DLAB);
if (serial_in(info, UART_EFR) == 0) {
state->type = PORT_16650;
} else {
serial_outp(info, UART_LCR, 0xBF);
if (serial_in(info, UART_EFR) == 0)
state->type = PORT_16650V2;
}
}
if (state->type == PORT_16550A) {
/* Check for TI 16750 */
serial_outp(info, UART_LCR, scratch2 | UART_LCR_DLAB);
serial_outp(info, UART_FCR,
UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
scratch = serial_in(info, UART_IIR) >> 5;
if (scratch == 7) {
serial_outp(info, UART_LCR, 0);
scratch = serial_in(info, UART_IIR) >> 5;
if (scratch == 6)
state->type = PORT_16750;
}
serial_outp(info, UART_FCR, UART_FCR_ENABLE_FIFO);
}
serial_outp(info, UART_LCR, scratch2);
if (state->type == PORT_16450) {
scratch = serial_in(info, UART_SCR);
serial_outp(info, UART_SCR, 0xa5);
status1 = serial_in(info, UART_SCR);
serial_outp(info, UART_SCR, 0x5a);
status2 = serial_in(info, UART_SCR);
serial_outp(info, UART_SCR, scratch);
if ((status1 != 0xa5) || (status2 != 0x5a))
state->type = PORT_8250;
}
state->xmit_fifo_size = uart_config[state->type].dfl_xmit_fifo_size;
if (state->type == PORT_UNKNOWN) {
restore_flags(flags);
return;
}
request_region(info->port,8,"serial(auto)");
/*
* Reset the UART.
*/
#if defined(__alpha__) && !defined(CONFIG_PCI)
/*
* I wonder what DEC did to the OUT1 and OUT2 lines?
* clearing them results in endless interrupts.
*/
serial_outp(info, UART_MCR, 0x0c);
#else
serial_outp(info, UART_MCR, 0x00);
#endif
serial_outp(info, UART_FCR, (UART_FCR_CLEAR_RCVR |
UART_FCR_CLEAR_XMIT));
(void)serial_in(info, UART_RX);
restore_flags(flags);
}
/*
* The serial driver boot-time initialization code!
*/
__initfunc(int rs_init(void))
{
int i;
struct serial_state * state;
init_bh(SERIAL_BH, do_serial_bh);
timer_table[RS_TIMER].fn = rs_timer;
timer_table[RS_TIMER].expires = 0;
#ifdef CONFIG_AUTO_IRQ
rs_wild_int_mask = check_wild_interrupts(1);
#endif
for (i = 0; i < 16; i++) {
IRQ_ports[i] = 0;
IRQ_timeout[i] = 0;
#ifdef CONFIG_SERIAL_MULTIPORT
memset(&rs_multiport[i], 0,
sizeof(struct rs_multiport_struct));
#endif
}
#ifdef CONFIG_SERIAL_CONSOLE
/*
* The interrupt of the serial console port
* can't be shared.
*/
if (sercons.flags & CON_FIRST) {
for(i = 0; i < NR_PORTS; i++)
if (i != sercons.index &&
rs_table[i].irq == rs_table[sercons.index].irq)
rs_table[i].irq = 0;
}
#endif
show_serial_version();
/* Initialize the tty_driver structure */
memset(&serial_driver, 0, sizeof(struct tty_driver));
serial_driver.magic = TTY_DRIVER_MAGIC;
serial_driver.driver_name = "serial";
serial_driver.name = "ttyS";
serial_driver.major = TTY_MAJOR;
serial_driver.minor_start = 64;
serial_driver.num = NR_PORTS;
serial_driver.type = TTY_DRIVER_TYPE_SERIAL;
serial_driver.subtype = SERIAL_TYPE_NORMAL;
serial_driver.init_termios = tty_std_termios;
serial_driver.init_termios.c_cflag =
B9600 | CS8 | CREAD | HUPCL | CLOCAL;
serial_driver.flags = TTY_DRIVER_REAL_RAW;
serial_driver.refcount = &serial_refcount;
serial_driver.table = serial_table;
serial_driver.termios = serial_termios;
serial_driver.termios_locked = serial_termios_locked;
serial_driver.open = rs_open;
serial_driver.close = rs_close;
serial_driver.write = rs_write;
serial_driver.put_char = rs_put_char;
serial_driver.flush_chars = rs_flush_chars;
serial_driver.write_room = rs_write_room;
serial_driver.chars_in_buffer = rs_chars_in_buffer;
serial_driver.flush_buffer = rs_flush_buffer;
serial_driver.ioctl = rs_ioctl;
serial_driver.throttle = rs_throttle;
serial_driver.unthrottle = rs_unthrottle;
serial_driver.send_xchar = rs_send_xchar;
serial_driver.set_termios = rs_set_termios;
serial_driver.stop = rs_stop;
serial_driver.start = rs_start;
serial_driver.hangup = rs_hangup;
serial_driver.break_ctl = rs_break;
serial_driver.wait_until_sent = rs_wait_until_sent;
serial_driver.read_proc = rs_read_proc;
/*
* The callout device is just like normal device except for
* major number and the subtype code.
*/
callout_driver = serial_driver;
callout_driver.name = "cua";
callout_driver.major = TTYAUX_MAJOR;
callout_driver.subtype = SERIAL_TYPE_CALLOUT;
callout_driver.read_proc = 0;
callout_driver.proc_entry = 0;
if (tty_register_driver(&serial_driver))
panic("Couldn't register serial driver\n");
if (tty_register_driver(&callout_driver))
panic("Couldn't register callout driver\n");
for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
state->magic = SSTATE_MAGIC;
state->line = i;
state->type = PORT_UNKNOWN;
state->custom_divisor = 0;
state->close_delay = 5*HZ/10;
state->closing_wait = 30*HZ;
state->callout_termios = callout_driver.init_termios;
state->normal_termios = serial_driver.init_termios;
state->icount.cts = state->icount.dsr =
state->icount.rng = state->icount.dcd = 0;
state->icount.rx = state->icount.tx = 0;
state->icount.frame = state->icount.parity = 0;
state->icount.overrun = state->icount.brk = 0;
if (state->irq == 2)
state->irq = 9;
if (state->type == PORT_UNKNOWN) {
if (!(state->flags & ASYNC_BOOT_AUTOCONF))
continue;
if (check_region(state->port,8))
continue;
autoconfig(state);
if (state->type == PORT_UNKNOWN)
continue;
}
printk(KERN_INFO "ttyS%02d%s at 0x%04x (irq = %d) is a %s\n",
state->line,
(state->flags & ASYNC_FOURPORT) ? " FourPort" : "",
state->port, state->irq,
uart_config[state->type].name);
}
return 0;
}
#ifdef MODULE
int init_module(void)
{
return rs_init();
}
void cleanup_module(void)
{
unsigned long flags;
int e1, e2;
int i;
/* printk("Unloading %s: version %s\n", serial_name, serial_version); */
save_flags(flags);
cli();
timer_active &= ~(1 << RS_TIMER);
timer_table[RS_TIMER].fn = NULL;
timer_table[RS_TIMER].expires = 0;
remove_bh(SERIAL_BH);
if ((e1 = tty_unregister_driver(&serial_driver)))
printk("SERIAL: failed to unregister serial driver (%d)\n",
e1);
if ((e2 = tty_unregister_driver(&callout_driver)))
printk("SERIAL: failed to unregister callout driver (%d)\n",
e2);
restore_flags(flags);
for (i = 0; i < NR_PORTS; i++) {
if (rs_table[i].type != PORT_UNKNOWN)
release_region(rs_table[i].port, 8);
}
if (tmp_buf) {
free_page((unsigned long) tmp_buf);
tmp_buf = NULL;
}
}
#endif /* MODULE */
