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mcfserial.c
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mcfserial.c
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/*
* mcfserial.c -- serial driver for ColdFire internal UARTS.
*
* Copyright (C) 1999-2003 Greg Ungerer <gerg@snapgear.com>
* Copyright (c) 2000-2001 Lineo, Inc. <www.lineo.com>
* Copyright (C) 2001-2002 SnapGear Inc. <www.snapgear.com>
*
* Based on code from 68332serial.c which was:
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1998 TSHG
* Copyright (c) 1999 Rt-Control Inc. <jeff@uclinux.org>
*
* Changes:
* 08/07/2003 Daniele Bellucci <bellucda@tiscali.it>
* some cleanups in mcfrs_write.
*
*/
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/wait.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/kernel.h>
#include <linux/serial.h>
#include <linux/serialP.h>
#include <linux/console.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/semaphore.h>
#include <asm/delay.h>
#include <asm/coldfire.h>
#include <asm/mcfsim.h>
#include <asm/mcfuart.h>
#include <asm/nettel.h>
#include <asm/uaccess.h>
#include "mcfserial.h"
struct timer_list mcfrs_timer_struct;
/*
* Default console baud rate, we use this as the default
* for all ports so init can just open /dev/console and
* keep going. Perhaps one day the cflag settings for the
* console can be used instead.
*/
#if defined(CONFIG_HW_FEITH)
#define CONSOLE_BAUD_RATE 38400
#define DEFAULT_CBAUD B38400
#elif defined(CONFIG_MOD5272) || defined(CONFIG_M5208EVB) || \
defined(CONFIG_M5329EVB) || defined(CONFIG_GILBARCO)
#define CONSOLE_BAUD_RATE 115200
#define DEFAULT_CBAUD B115200
#elif defined(CONFIG_ARNEWSH) || defined(CONFIG_FREESCALE) || \
defined(CONFIG_senTec) || defined(CONFIG_SNEHA) || defined(CONFIG_AVNET)
#define CONSOLE_BAUD_RATE 19200
#define DEFAULT_CBAUD B19200
#endif
#ifndef CONSOLE_BAUD_RATE
#define CONSOLE_BAUD_RATE 9600
#define DEFAULT_CBAUD B9600
#endif
int mcfrs_console_inited = 0;
int mcfrs_console_port = -1;
int mcfrs_console_baud = CONSOLE_BAUD_RATE;
int mcfrs_console_cbaud = DEFAULT_CBAUD;
/*
* Driver data structures.
*/
static struct tty_driver *mcfrs_serial_driver;
/* number of characters left in xmit buffer before we ask for more */
#define WAKEUP_CHARS 256
/* Debugging...
*/
#undef SERIAL_DEBUG_OPEN
#undef SERIAL_DEBUG_FLOW
#if defined(CONFIG_M523x) || defined(CONFIG_M527x) || defined(CONFIG_M528x) || \
defined(CONFIG_M520x) || defined(CONFIG_M532x)
#define IRQBASE (MCFINT_VECBASE+MCFINT_UART0)
#else
#define IRQBASE 73
#endif
/*
* Configuration table, UARTs to look for at startup.
*/
static struct mcf_serial mcfrs_table[] = {
{ /* ttyS0 */
.magic = 0,
.addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE1),
.irq = IRQBASE,
.flags = ASYNC_BOOT_AUTOCONF,
},
#ifdef MCFUART_BASE2
{ /* ttyS1 */
.magic = 0,
.addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE2),
.irq = IRQBASE+1,
.flags = ASYNC_BOOT_AUTOCONF,
},
#endif
#ifdef MCFUART_BASE3
{ /* ttyS2 */
.magic = 0,
.addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE3),
.irq = IRQBASE+2,
.flags = ASYNC_BOOT_AUTOCONF,
},
#endif
#ifdef MCFUART_BASE4
{ /* ttyS3 */
.magic = 0,
.addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE4),
.irq = IRQBASE+3,
.flags = ASYNC_BOOT_AUTOCONF,
},
#endif
};
#define NR_PORTS (sizeof(mcfrs_table) / sizeof(struct mcf_serial))
/*
* This is used to figure out the divisor speeds and the timeouts.
*/
static int mcfrs_baud_table[] = {
0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
9600, 19200, 38400, 57600, 115200, 230400, 460800, 0
};
#define MCFRS_BAUD_TABLE_SIZE \
(sizeof(mcfrs_baud_table)/sizeof(mcfrs_baud_table[0]))
#ifdef CONFIG_MAGIC_SYSRQ
/*
* Magic system request keys. Used for debugging...
*/
extern int magic_sysrq_key(int ch);
#endif
/*
* Forware declarations...
*/
static void mcfrs_change_speed(struct mcf_serial *info);
static void mcfrs_wait_until_sent(struct tty_struct *tty, int timeout);
static inline int serial_paranoia_check(struct mcf_serial *info,
char *name, const char *routine)
{
#ifdef SERIAL_PARANOIA_CHECK
static const char badmagic[] =
"MCFRS(warning): bad magic number for serial struct %s in %s\n";
static const char badinfo[] =
"MCFRS(warning): null mcf_serial for %s in %s\n";
if (!info) {
printk(badinfo, name, routine);
return 1;
}
if (info->magic != SERIAL_MAGIC) {
printk(badmagic, name, routine);
return 1;
}
#endif
return 0;
}
/*
* Sets or clears DTR and RTS on the requested line.
*/
static void mcfrs_setsignals(struct mcf_serial *info, int dtr, int rts)
{
volatile unsigned char *uartp;
unsigned long flags;
#if 0
printk("%s(%d): mcfrs_setsignals(info=%x,dtr=%d,rts=%d)\n",
__FILE__, __LINE__, info, dtr, rts);
#endif
local_irq_save(flags);
if (dtr >= 0) {
#ifdef MCFPP_DTR0
if (info->line)
mcf_setppdata(MCFPP_DTR1, (dtr ? 0 : MCFPP_DTR1));
else
mcf_setppdata(MCFPP_DTR0, (dtr ? 0 : MCFPP_DTR0));
#endif
}
if (rts >= 0) {
uartp = info->addr;
if (rts) {
info->sigs |= TIOCM_RTS;
uartp[MCFUART_UOP1] = MCFUART_UOP_RTS;
} else {
info->sigs &= ~TIOCM_RTS;
uartp[MCFUART_UOP0] = MCFUART_UOP_RTS;
}
}
local_irq_restore(flags);
return;
}
/*
* Gets values of serial signals.
*/
static int mcfrs_getsignals(struct mcf_serial *info)
{
volatile unsigned char *uartp;
unsigned long flags;
int sigs;
#if defined(CONFIG_NETtel) && defined(CONFIG_M5307)
unsigned short ppdata;
#endif
#if 0
printk("%s(%d): mcfrs_getsignals(info=%x)\n", __FILE__, __LINE__);
#endif
local_irq_save(flags);
uartp = info->addr;
sigs = (uartp[MCFUART_UIPR] & MCFUART_UIPR_CTS) ? 0 : TIOCM_CTS;
sigs |= (info->sigs & TIOCM_RTS);
#ifdef MCFPP_DCD0
{
unsigned int ppdata;
ppdata = mcf_getppdata();
if (info->line == 0) {
sigs |= (ppdata & MCFPP_DCD0) ? 0 : TIOCM_CD;
sigs |= (ppdata & MCFPP_DTR0) ? 0 : TIOCM_DTR;
} else if (info->line == 1) {
sigs |= (ppdata & MCFPP_DCD1) ? 0 : TIOCM_CD;
sigs |= (ppdata & MCFPP_DTR1) ? 0 : TIOCM_DTR;
}
}
#endif
local_irq_restore(flags);
return(sigs);
}
/*
* ------------------------------------------------------------
* mcfrs_stop() and mcfrs_start()
*
* This routines are called before setting or resetting tty->stopped.
* They enable or disable transmitter interrupts, as necessary.
* ------------------------------------------------------------
*/
static void mcfrs_stop(struct tty_struct *tty)
{
volatile unsigned char *uartp;
struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->name, "mcfrs_stop"))
return;
local_irq_save(flags);
uartp = info->addr;
info->imr &= ~MCFUART_UIR_TXREADY;
uartp[MCFUART_UIMR] = info->imr;
local_irq_restore(flags);
}
static void mcfrs_start(struct tty_struct *tty)
{
volatile unsigned char *uartp;
struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->name, "mcfrs_start"))
return;
local_irq_save(flags);
if (info->xmit_cnt && info->xmit_buf) {
uartp = info->addr;
info->imr |= MCFUART_UIR_TXREADY;
uartp[MCFUART_UIMR] = info->imr;
}
local_irq_restore(flags);
}
/*
* ----------------------------------------------------------------------
*
* Here starts the interrupt handling routines. All of the following
* subroutines are declared as inline and are folded into
* mcfrs_interrupt(). They were separated out for readability's sake.
*
* Note: mcfrs_interrupt() is a "fast" interrupt, which means that it
* runs with interrupts turned off. People who may want to modify
* mcfrs_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 inline void receive_chars(struct mcf_serial *info)
{
volatile unsigned char *uartp;
struct tty_struct *tty = info->tty;
unsigned char status, ch, flag;
if (!tty)
return;
uartp = info->addr;
while ((status = uartp[MCFUART_USR]) & MCFUART_USR_RXREADY) {
ch = uartp[MCFUART_URB];
info->stats.rx++;
#ifdef CONFIG_MAGIC_SYSRQ
if (mcfrs_console_inited && (info->line == mcfrs_console_port)) {
if (magic_sysrq_key(ch))
continue;
}
#endif
flag = TTY_NORMAL;
if (status & MCFUART_USR_RXERR) {
uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETERR;
if (status & MCFUART_USR_RXBREAK) {
info->stats.rxbreak++;
flag = TTY_BREAK;
} else if (status & MCFUART_USR_RXPARITY) {
info->stats.rxparity++;
flag = TTY_PARITY;
} else if (status & MCFUART_USR_RXOVERRUN) {
info->stats.rxoverrun++;
flag = TTY_OVERRUN;
} else if (status & MCFUART_USR_RXFRAMING) {
info->stats.rxframing++;
flag = TTY_FRAME;
}
}
tty_insert_flip_char(tty, ch, flag);
}
tty_schedule_flip(tty);
return;
}
static inline void transmit_chars(struct mcf_serial *info)
{
volatile unsigned char *uartp;
uartp = info->addr;
if (info->x_char) {
/* Send special char - probably flow control */
uartp[MCFUART_UTB] = info->x_char;
info->x_char = 0;
info->stats.tx++;
}
if ((info->xmit_cnt <= 0) || info->tty->stopped) {
info->imr &= ~MCFUART_UIR_TXREADY;
uartp[MCFUART_UIMR] = info->imr;
return;
}
while (uartp[MCFUART_USR] & MCFUART_USR_TXREADY) {
uartp[MCFUART_UTB] = info->xmit_buf[info->xmit_tail++];
info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
info->stats.tx++;
if (--info->xmit_cnt <= 0)
break;
}
if (info->xmit_cnt < WAKEUP_CHARS)
schedule_work(&info->tqueue);
return;
}
/*
* This is the serial driver's generic interrupt routine
*/
irqreturn_t mcfrs_interrupt(int irq, void *dev_id)
{
struct mcf_serial *info;
unsigned char isr;
info = &mcfrs_table[(irq - IRQBASE)];
isr = info->addr[MCFUART_UISR] & info->imr;
if (isr & MCFUART_UIR_RXREADY)
receive_chars(info);
if (isr & MCFUART_UIR_TXREADY)
transmit_chars(info);
return IRQ_HANDLED;
}
/*
* -------------------------------------------------------------------
* Here ends the serial interrupt routines.
* -------------------------------------------------------------------
*/
static void mcfrs_offintr(struct work_struct *work)
{
struct mcf_serial *info = container_of(work, struct mcf_serial, tqueue);
struct tty_struct *tty = info->tty;
if (tty)
tty_wakeup(tty);
}
/*
* Change of state on a DCD line.
*/
void mcfrs_modem_change(struct mcf_serial *info, int dcd)
{
if (info->count == 0)
return;
if (info->flags & ASYNC_CHECK_CD) {
if (dcd)
wake_up_interruptible(&info->open_wait);
else
schedule_work(&info->tqueue_hangup);
}
}
#ifdef MCFPP_DCD0
unsigned short mcfrs_ppstatus;
/*
* This subroutine is called when the RS_TIMER goes off. It is used
* to monitor the state of the DCD lines - since they have no edge
* sensors and interrupt generators.
*/
static void mcfrs_timer(void)
{
unsigned int ppstatus, dcdval, i;
ppstatus = mcf_getppdata() & (MCFPP_DCD0 | MCFPP_DCD1);
if (ppstatus != mcfrs_ppstatus) {
for (i = 0; (i < 2); i++) {
dcdval = (i ? MCFPP_DCD1 : MCFPP_DCD0);
if ((ppstatus & dcdval) != (mcfrs_ppstatus & dcdval)) {
mcfrs_modem_change(&mcfrs_table[i],
((ppstatus & dcdval) ? 0 : 1));
}
}
}
mcfrs_ppstatus = ppstatus;
/* Re-arm timer */
mcfrs_timer_struct.expires = jiffies + HZ/25;
add_timer(&mcfrs_timer_struct);
}
#endif /* MCFPP_DCD0 */
/*
* This routine is called from the scheduler tqueue when the interrupt
* routine has signalled that a hangup has occurred. The path of
* hangup processing is:
*
* serial interrupt routine -> (scheduler tqueue) ->
* do_serial_hangup() -> tty->hangup() -> mcfrs_hangup()
*
*/
static void do_serial_hangup(struct work_struct *work)
{
struct mcf_serial *info = container_of(work, struct mcf_serial, tqueue_hangup);
struct tty_struct *tty = info->tty;
if (tty)
tty_hangup(tty);
}
static int startup(struct mcf_serial * info)
{
volatile unsigned char *uartp;
unsigned long flags;
if (info->flags & ASYNC_INITIALIZED)
return 0;
if (!info->xmit_buf) {
info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
if (!info->xmit_buf)
return -ENOMEM;
}
local_irq_save(flags);
#ifdef SERIAL_DEBUG_OPEN
printk("starting up ttyS%d (irq %d)...\n", info->line, info->irq);
#endif
/*
* Reset UART, get it into known state...
*/
uartp = info->addr;
uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */
uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */
mcfrs_setsignals(info, 1, 1);
if (info->tty)
clear_bit(TTY_IO_ERROR, &info->tty->flags);
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
/*
* and set the speed of the serial port
*/
mcfrs_change_speed(info);
/*
* Lastly enable the UART transmitter and receiver, and
* interrupt enables.
*/
info->imr = MCFUART_UIR_RXREADY;
uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE;
uartp[MCFUART_UIMR] = info->imr;
info->flags |= ASYNC_INITIALIZED;
local_irq_restore(flags);
return 0;
}
/*
* 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 mcf_serial * info)
{
volatile unsigned char *uartp;
unsigned long flags;
if (!(info->flags & ASYNC_INITIALIZED))
return;
#ifdef SERIAL_DEBUG_OPEN
printk("Shutting down serial port %d (irq %d)....\n", info->line,
info->irq);
#endif
local_irq_save(flags);
uartp = info->addr;
uartp[MCFUART_UIMR] = 0; /* mask all interrupts */
uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */
uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */
if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
mcfrs_setsignals(info, 0, 0);
if (info->xmit_buf) {
free_page((unsigned long) info->xmit_buf);
info->xmit_buf = 0;
}
if (info->tty)
set_bit(TTY_IO_ERROR, &info->tty->flags);
info->flags &= ~ASYNC_INITIALIZED;
local_irq_restore(flags);
}
/*
* This routine is called to set the UART divisor registers to match
* the specified baud rate for a serial port.
*/
static void mcfrs_change_speed(struct mcf_serial *info)
{
volatile unsigned char *uartp;
unsigned int baudclk, cflag;
unsigned long flags;
unsigned char mr1, mr2;
int i;
#ifdef CONFIG_M5272
unsigned int fraction;
#endif
if (!info->tty || !info->tty->termios)
return;
cflag = info->tty->termios->c_cflag;
if (info->addr == 0)
return;
#if 0
printk("%s(%d): mcfrs_change_speed()\n", __FILE__, __LINE__);
#endif
i = cflag & CBAUD;
if (i & CBAUDEX) {
i &= ~CBAUDEX;
if (i < 1 || i > 4)
info->tty->termios->c_cflag &= ~CBAUDEX;
else
i += 15;
}
if (i == 0) {
mcfrs_setsignals(info, 0, -1);
return;
}
/* compute the baudrate clock */
#ifdef CONFIG_M5272
/*
* For the MCF5272, also compute the baudrate fraction.
*/
baudclk = (MCF_BUSCLK / mcfrs_baud_table[i]) / 32;
fraction = MCF_BUSCLK - (baudclk * 32 * mcfrs_baud_table[i]);
fraction *= 16;
fraction /= (32 * mcfrs_baud_table[i]);
#else
baudclk = ((MCF_BUSCLK / mcfrs_baud_table[i]) + 16) / 32;
#endif
info->baud = mcfrs_baud_table[i];
mr1 = MCFUART_MR1_RXIRQRDY | MCFUART_MR1_RXERRCHAR;
mr2 = 0;
switch (cflag & CSIZE) {
case CS5: mr1 |= MCFUART_MR1_CS5; break;
case CS6: mr1 |= MCFUART_MR1_CS6; break;
case CS7: mr1 |= MCFUART_MR1_CS7; break;
case CS8:
default: mr1 |= MCFUART_MR1_CS8; break;
}
if (cflag & PARENB) {
if (cflag & CMSPAR) {
if (cflag & PARODD)
mr1 |= MCFUART_MR1_PARITYMARK;
else
mr1 |= MCFUART_MR1_PARITYSPACE;
} else {
if (cflag & PARODD)
mr1 |= MCFUART_MR1_PARITYODD;
else
mr1 |= MCFUART_MR1_PARITYEVEN;
}
} else {
mr1 |= MCFUART_MR1_PARITYNONE;
}
if (cflag & CSTOPB)
mr2 |= MCFUART_MR2_STOP2;
else
mr2 |= MCFUART_MR2_STOP1;
if (cflag & CRTSCTS) {
mr1 |= MCFUART_MR1_RXRTS;
mr2 |= MCFUART_MR2_TXCTS;
}
if (cflag & CLOCAL)
info->flags &= ~ASYNC_CHECK_CD;
else
info->flags |= ASYNC_CHECK_CD;
uartp = info->addr;
local_irq_save(flags);
#if 0
printk("%s(%d): mr1=%x mr2=%x baudclk=%x\n", __FILE__, __LINE__,
mr1, mr2, baudclk);
#endif
/*
Note: pg 12-16 of MCF5206e User's Manual states that a
software reset should be performed prior to changing
UMR1,2, UCSR, UACR, bit 7
*/
uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */
uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */
uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETMRPTR; /* reset MR pointer */
uartp[MCFUART_UMR] = mr1;
uartp[MCFUART_UMR] = mr2;
uartp[MCFUART_UBG1] = (baudclk & 0xff00) >> 8; /* set msb byte */
uartp[MCFUART_UBG2] = (baudclk & 0xff); /* set lsb byte */
#ifdef CONFIG_M5272
uartp[MCFUART_UFPD] = (fraction & 0xf); /* set fraction */
#endif
uartp[MCFUART_UCSR] = MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER;
uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE;
mcfrs_setsignals(info, 1, -1);
local_irq_restore(flags);
return;
}
static void mcfrs_flush_chars(struct tty_struct *tty)
{
volatile unsigned char *uartp;
struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->name, "mcfrs_flush_chars"))
return;
uartp = (volatile unsigned char *) info->addr;
/*
* re-enable receiver interrupt
*/
local_irq_save(flags);
if ((!(info->imr & MCFUART_UIR_RXREADY)) &&
(info->flags & ASYNC_INITIALIZED) ) {
info->imr |= MCFUART_UIR_RXREADY;
uartp[MCFUART_UIMR] = info->imr;
}
local_irq_restore(flags);
if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
!info->xmit_buf)
return;
/* Enable transmitter */
local_irq_save(flags);
info->imr |= MCFUART_UIR_TXREADY;
uartp[MCFUART_UIMR] = info->imr;
local_irq_restore(flags);
}
static int mcfrs_write(struct tty_struct * tty,
const unsigned char *buf, int count)
{
volatile unsigned char *uartp;
struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
unsigned long flags;
int c, total = 0;
#if 0
printk("%s(%d): mcfrs_write(tty=%x,buf=%x,count=%d)\n",
__FILE__, __LINE__, (int)tty, (int)buf, count);
#endif
if (serial_paranoia_check(info, tty->name, "mcfrs_write"))
return 0;
if (!tty || !info->xmit_buf)
return 0;
local_save_flags(flags);
while (1) {
local_irq_disable();
c = min(count, (int) min(((int)SERIAL_XMIT_SIZE) - info->xmit_cnt - 1,
((int)SERIAL_XMIT_SIZE) - info->xmit_head));
local_irq_restore(flags);
if (c <= 0)
break;
memcpy(info->xmit_buf + info->xmit_head, buf, c);
local_irq_disable();
info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
info->xmit_cnt += c;
local_irq_restore(flags);
buf += c;
count -= c;
total += c;
}
local_irq_disable();
uartp = info->addr;
info->imr |= MCFUART_UIR_TXREADY;
uartp[MCFUART_UIMR] = info->imr;
local_irq_restore(flags);
return total;
}
static int mcfrs_write_room(struct tty_struct *tty)
{
struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
int ret;
if (serial_paranoia_check(info, tty->name, "mcfrs_write_room"))
return 0;
ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
if (ret < 0)
ret = 0;
return ret;
}
static int mcfrs_chars_in_buffer(struct tty_struct *tty)
{
struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
if (serial_paranoia_check(info, tty->name, "mcfrs_chars_in_buffer"))
return 0;
return info->xmit_cnt;
}
static void mcfrs_flush_buffer(struct tty_struct *tty)
{
struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->name, "mcfrs_flush_buffer"))
return;
local_irq_save(flags);
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
local_irq_restore(flags);
tty_wakeup(tty);
}
/*
* ------------------------------------------------------------
* mcfrs_throttle()
*
* This routine is called by the upper-layer tty layer to signal that
* incoming characters should be throttled.
* ------------------------------------------------------------
*/
static void mcfrs_throttle(struct tty_struct * tty)
{
struct mcf_serial *info = (struct mcf_serial *)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->name, "mcfrs_throttle"))
return;
if (I_IXOFF(tty))
info->x_char = STOP_CHAR(tty);
/* Turn off RTS line (do this atomic) */
}
static void mcfrs_unthrottle(struct tty_struct * tty)
{
struct mcf_serial *info = (struct mcf_serial *)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->name, "mcfrs_unthrottle"))
return;
if (I_IXOFF(tty)) {
if (info->x_char)
info->x_char = 0;
else
info->x_char = START_CHAR(tty);
}
/* Assert RTS line (do this atomic) */
}
/*
* ------------------------------------------------------------
* mcfrs_ioctl() and friends
* ------------------------------------------------------------
*/
static int get_serial_info(struct mcf_serial * info,
struct serial_struct * retinfo)
{
struct serial_struct tmp;
if (!retinfo)
return -EFAULT;
memset(&tmp, 0, sizeof(tmp));
tmp.type = info->type;
tmp.line = info->line;
tmp.port = (unsigned int) info->addr;
tmp.irq = info->irq;
tmp.flags = info->flags;
tmp.baud_base = info->baud_base;
tmp.close_delay = info->close_delay;
tmp.closing_wait = info->closing_wait;
tmp.custom_divisor = info->custom_divisor;
return copy_to_user(retinfo,&tmp,sizeof(*retinfo)) ? -EFAULT : 0;
}
static int set_serial_info(struct mcf_serial * info,
struct serial_struct * new_info)
{
struct serial_struct new_serial;
struct mcf_serial old_info;
int retval = 0;
if (!new_info)
return -EFAULT;
if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
return -EFAULT;
old_info = *info;
if (!capable(CAP_SYS_ADMIN)) {
if ((new_serial.baud_base != info->baud_base) ||
(new_serial.type != info->type) ||
(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;
goto check_and_exit;
}
if (info->count > 1)
return -EBUSY;
/*
* OK, past this point, all the error checking has been done.
* At this point, we start making changes.....
*/
info->baud_base = new_serial.baud_base;
info->flags = ((info->flags & ~ASYNC_FLAGS) |
(new_serial.flags & ASYNC_FLAGS));
info->type = new_serial.type;
info->close_delay = new_serial.close_delay;
info->closing_wait = new_serial.closing_wait;
check_and_exit:
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 mcf_serial * info, unsigned int *value)
{
volatile unsigned char *uartp;
unsigned long flags;
unsigned char status;
local_irq_save(flags);
uartp = info->addr;
status = (uartp[MCFUART_USR] & MCFUART_USR_TXEMPTY) ? TIOCSER_TEMT : 0;
local_irq_restore(flags);
return put_user(status,value);
}
/*
* This routine sends a break character out the serial port.
*/
static void send_break( struct mcf_serial * info, int duration)
{
volatile unsigned char *uartp;
unsigned long flags;
if (!info->addr)
return;
set_current_state(TASK_INTERRUPTIBLE);
uartp = info->addr;
local_irq_save(flags);