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linux-next/drivers/serial/mcfserial.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

1884 lines
46 KiB
C
Raw Blame History

/*
* 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/segment.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_ARNEWSH) || defined(CONFIG_MOTOROLA) || defined(CONFIG_senTec) || defined(CONFIG_SNEHA)
#define CONSOLE_BAUD_RATE 19200
#define DEFAULT_CBAUD B19200
#endif
#if defined(CONFIG_HW_FEITH)
#define CONSOLE_BAUD_RATE 38400
#define DEFAULT_CBAUD B38400
#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_M527x) || defined(CONFIG_M528x)
#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,
},
{ /* ttyS1 */
.magic = 0,
.addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE2),
.irq = IRQBASE+1,
.flags = ASYNC_BOOT_AUTOCONF,
},
};
#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;
if (!tty)
return;
uartp = info->addr;
while ((status = uartp[MCFUART_USR]) & MCFUART_USR_RXREADY) {
if (tty->flip.count >= TTY_FLIPBUF_SIZE)
break;
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
tty->flip.count++;
if (status & MCFUART_USR_RXERR) {
uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETERR;
if (status & MCFUART_USR_RXBREAK) {
info->stats.rxbreak++;
*tty->flip.flag_buf_ptr++ = TTY_BREAK;
} else if (status & MCFUART_USR_RXPARITY) {
info->stats.rxparity++;
*tty->flip.flag_buf_ptr++ = TTY_PARITY;
} else if (status & MCFUART_USR_RXOVERRUN) {
info->stats.rxoverrun++;
*tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
} else if (status & MCFUART_USR_RXFRAMING) {
info->stats.rxframing++;
*tty->flip.flag_buf_ptr++ = TTY_FRAME;
} else {
/* This should never happen... */
*tty->flip.flag_buf_ptr++ = 0;
}
} else {
*tty->flip.flag_buf_ptr++ = 0;
}
*tty->flip.char_buf_ptr++ = ch;
}
schedule_work(&tty->flip.work);
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 pt_regs *regs)
{
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(void *private)
{
struct mcf_serial *info = (struct mcf_serial *) private;
struct tty_struct *tty;
tty = info->tty;
if (!tty)
return;
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(void *private)
{
struct mcf_serial *info = (struct mcf_serial *) private;
struct tty_struct *tty;
tty = info->tty;
if (!tty)
return;
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);
uartp[MCFUART_UCR] = MCFUART_UCR_CMDBREAKSTART;
schedule_timeout(duration);
uartp[MCFUART_UCR] = MCFUART_UCR_CMDBREAKSTOP;
local_irq_restore(flags);
}
static int mcfrs_tiocmget(struct tty_struct *tty, struct file *file)
{
struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl"))
return -ENODEV;
if (tty->flags & (1 << TTY_IO_ERROR))
return -EIO;
return mcfrs_getsignals(info);
}
static int mcfrs_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear)
{
struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
int rts = -1, dtr = -1;
if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl"))
return -ENODEV;
if (tty->flags & (1 << TTY_IO_ERROR))
return -EIO;
if (set & TIOCM_RTS)
rts = 1;
if (set & TIOCM_DTR)
dtr = 1;
if (clear & TIOCM_RTS)
rts = 0;
if (clear & TIOCM_DTR)
dtr = 0;
mcfrs_setsignals(info, dtr, rts);
return 0;
}
static int mcfrs_ioctl(struct tty_struct *tty, struct file * file,
unsigned int cmd, unsigned long arg)
{
struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
int retval, error;
if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl"))
return -ENODEV;
if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
(cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
(cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
if (tty->flags & (1 << TTY_IO_ERROR))
return -EIO;
}
switch (cmd) {
case TCSBRK: /* SVID version: non-zero arg --> no break */
retval = tty_check_change(tty);
if (retval)
return retval;
tty_wait_until_sent(tty, 0);
if (!arg)
send_break(info, HZ/4); /* 1/4 second */
return 0;
case TCSBRKP: /* support for POSIX tcsendbreak() */
retval = tty_check_change(tty);
if (retval)
return retval;
tty_wait_until_sent(tty, 0);
send_break(info, arg ? arg*(HZ/10) : HZ/4);
return 0;
case TIOCGSOFTCAR:
error = put_user(C_CLOCAL(tty) ? 1 : 0,
(unsigned long *) arg);
if (error)
return error;
return 0;
case TIOCSSOFTCAR:
get_user(arg, (unsigned long *) arg);
tty->termios->c_cflag =
((tty->termios->c_cflag & ~CLOCAL) |
(arg ? CLOCAL : 0));
return 0;
case TIOCGSERIAL:
if (access_ok(VERIFY_WRITE, (void *) arg,
sizeof(struct serial_struct)))
return get_serial_info(info,
(struct serial_struct *) arg);
return -EFAULT;
case TIOCSSERIAL:
return set_serial_info(info,
(struct serial_struct *) arg);
case TIOCSERGETLSR: /* Get line status register */
if (access_ok(VERIFY_WRITE, (void *) arg,
sizeof(unsigned int)))
return get_lsr_info(info, (unsigned int *) arg);
return -EFAULT;
case TIOCSERGSTRUCT:
error = copy_to_user((struct mcf_serial *) arg,
info, sizeof(struct mcf_serial));
if (error)
return -EFAULT;
return 0;
#ifdef TIOCSET422
case TIOCSET422: {
unsigned int val;
get_user(val, (unsigned int *) arg);
mcf_setpa(MCFPP_PA11, (val ? 0 : MCFPP_PA11));
break;
}
case TIOCGET422: {
unsigned int val;
val = (mcf_getpa() & MCFPP_PA11) ? 0 : 1;
put_user(val, (unsigned int *) arg);
break;
}
#endif
default:
return -ENOIOCTLCMD;
}
return 0;
}
static void mcfrs_set_termios(struct tty_struct *tty, struct termios *old_termios)
{
struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
if (tty->termios->c_cflag == old_termios->c_cflag)
return;
mcfrs_change_speed(info);
if ((old_termios->c_cflag & CRTSCTS) &&
!(tty->termios->c_cflag & CRTSCTS)) {
tty->hw_stopped = 0;
mcfrs_setsignals(info, -1, 1);
#if 0
mcfrs_start(tty);
#endif
}
}
/*
* ------------------------------------------------------------
* mcfrs_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
* S structure from the interrupt chain if necessary, and we free
* that IRQ if nothing is left in the chain.
* ------------------------------------------------------------
*/
static void mcfrs_close(struct tty_struct *tty, struct file * filp)
{
volatile unsigned char *uartp;
struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
unsigned long flags;
if (!info || serial_paranoia_check(info, tty->name, "mcfrs_close"))
return;
local_irq_save(flags);
if (tty_hung_up_p(filp)) {
local_irq_restore(flags);
return;
}
#ifdef SERIAL_DEBUG_OPEN
printk("mcfrs_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("MCFRS: bad serial port count; tty->count is 1, "
"info->count is %d\n", info->count);
info->count = 1;
}
if (--info->count < 0) {
printk("MCFRS: bad serial port count for ttyS%d: %d\n",
info->line, info->count);
info->count = 0;
}
if (info->count) {
local_irq_restore(flags);
return;
}
info->flags |= ASYNC_CLOSING;
/*
* 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->imr &= ~MCFUART_UIR_RXREADY;
uartp = info->addr;
uartp[MCFUART_UIMR] = info->imr;
#if 0
/* FIXME: do we need to keep this enabled for console?? */
if (mcfrs_console_inited && (mcfrs_console_port == info->line)) {
/* Do not disable the UART */ ;
} else
#endif
shutdown(info);
if (tty->driver->flush_buffer)
tty->driver->flush_buffer(tty);
tty_ldisc_flush(tty);
tty->closing = 0;
info->event = 0;
info->tty = 0;
#if 0
if (tty->ldisc.num != ldiscs[N_TTY].num) {
if (tty->ldisc.close)
(tty->ldisc.close)(tty);
tty->ldisc = ldiscs[N_TTY];
tty->termios->c_line = N_TTY;
if (tty->ldisc.open)
(tty->ldisc.open)(tty);
}
#endif
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);
local_irq_restore(flags);
}
/*
* mcfrs_wait_until_sent() --- wait until the transmitter is empty
*/
static void
mcfrs_wait_until_sent(struct tty_struct *tty, int timeout)
{
#ifdef CONFIG_M5272
#define MCF5272_FIFO_SIZE 25 /* fifo size + shift reg */
struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
volatile unsigned char *uartp;
unsigned long orig_jiffies, fifo_time, char_time, fifo_cnt;
if (serial_paranoia_check(info, tty->name, "mcfrs_wait_until_sent"))
return;
orig_jiffies = jiffies;
/*
* Set the check interval to be 1/5 of the approximate time
* to send the entire fifo, 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.
*/
fifo_time = (MCF5272_FIFO_SIZE * HZ * 10) / info->baud;
char_time = fifo_time / 5;
if (char_time == 0)
char_time = 1;
if (timeout && timeout < char_time)
char_time = timeout;
/*
* Clamp the timeout period at 2 * the time to empty the
* fifo. Just to be safe, set the minimum at .5 seconds.
*/
fifo_time *= 2;
if (fifo_time < (HZ/2))
fifo_time = HZ/2;
if (!timeout || timeout > fifo_time)
timeout = fifo_time;
/*
* Account for the number of bytes in the UART
* transmitter FIFO plus any byte being shifted out.
*/
uartp = (volatile unsigned char *) info->addr;
for (;;) {
fifo_cnt = (uartp[MCFUART_UTF] & MCFUART_UTF_TXB);
if ((uartp[MCFUART_USR] & (MCFUART_USR_TXREADY|
MCFUART_USR_TXEMPTY)) ==
MCFUART_USR_TXREADY)
fifo_cnt++;
if (fifo_cnt == 0)
break;
msleep_interruptible(jiffies_to_msecs(char_time));
if (signal_pending(current))
break;
if (timeout && time_after(jiffies, orig_jiffies + timeout))
break;
}
#else
/*
* For the other coldfire models, assume all data has been sent
*/
#endif
}
/*
* mcfrs_hangup() --- called by tty_hangup() when a hangup is signaled.
*/
void mcfrs_hangup(struct tty_struct *tty)
{
struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
if (serial_paranoia_check(info, tty->name, "mcfrs_hangup"))
return;
mcfrs_flush_buffer(tty);
shutdown(info);
info->event = 0;
info->count = 0;
info->flags &= ~ASYNC_NORMAL_ACTIVE;
info->tty = 0;
wake_up_interruptible(&info->open_wait);
}
/*
* ------------------------------------------------------------
* mcfrs_open() and friends
* ------------------------------------------------------------
*/
static int block_til_ready(struct tty_struct *tty, struct file * filp,
struct mcf_serial *info)
{
DECLARE_WAITQUEUE(wait, current);
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 (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
* mcfrs_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
info->count--;
info->blocked_open++;
while (1) {
local_irq_disable();
mcfrs_setsignals(info, 1, 1);
local_irq_enable();
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_CLOSING) &&
(do_clocal || (mcfrs_getsignals(info) & TIOCM_CD)))
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
schedule();
}
current->state = TASK_RUNNING;
remove_wait_queue(&info->open_wait, &wait);
if (!tty_hung_up_p(filp))
info->count++;
info->blocked_open--;
#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 structure into
* the IRQ chain. It also performs the serial-specific
* initialization for the tty structure.
*/
int mcfrs_open(struct tty_struct *tty, struct file * filp)
{
struct mcf_serial *info;
int retval, line;
line = tty->index;
if ((line < 0) || (line >= NR_PORTS))
return -ENODEV;
info = mcfrs_table + line;
if (serial_paranoia_check(info, tty->name, "mcfrs_open"))
return -ENODEV;
#ifdef SERIAL_DEBUG_OPEN
printk("mcfrs_open %s, count = %d\n", tty->name, info->count);
#endif
info->count++;
tty->driver_data = info;
info->tty = tty;
/*
* 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("mcfrs_open returning after block_til_ready with %d\n",
retval);
#endif
return retval;
}
#ifdef SERIAL_DEBUG_OPEN
printk("mcfrs_open %s successful...\n", tty->name);
#endif
return 0;
}
/*
* Based on the line number set up the internal interrupt stuff.
*/
static void mcfrs_irqinit(struct mcf_serial *info)
{
#if defined(CONFIG_M5272)
volatile unsigned long *icrp;
volatile unsigned long *portp;
volatile unsigned char *uartp;
uartp = info->addr;
icrp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_ICR2);
switch (info->line) {
case 0:
*icrp = 0xe0000000;
break;
case 1:
*icrp = 0x0e000000;
break;
default:
printk("MCFRS: don't know how to handle UART %d interrupt?\n",
info->line);
return;
}
/* Enable the output lines for the serial ports */
portp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_PBCNT);
*portp = (*portp & ~0x000000ff) | 0x00000055;
portp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_PDCNT);
*portp = (*portp & ~0x000003fc) | 0x000002a8;
#elif defined(CONFIG_M527x) || defined(CONFIG_M528x)
volatile unsigned char *icrp, *uartp;
volatile unsigned long *imrp;
uartp = info->addr;
icrp = (volatile unsigned char *) (MCF_MBAR + MCFICM_INTC0 +
MCFINTC_ICR0 + MCFINT_UART0 + info->line);
*icrp = 0x33; /* UART0 with level 6, priority 3 */
imrp = (volatile unsigned long *) (MCF_MBAR + MCFICM_INTC0 +
MCFINTC_IMRL);
*imrp &= ~((1 << (info->irq - MCFINT_VECBASE)) | 1);
#else
volatile unsigned char *icrp, *uartp;
switch (info->line) {
case 0:
icrp = (volatile unsigned char *) (MCF_MBAR + MCFSIM_UART1ICR);
*icrp = /*MCFSIM_ICR_AUTOVEC |*/ MCFSIM_ICR_LEVEL6 |
MCFSIM_ICR_PRI1;
mcf_setimr(mcf_getimr() & ~MCFSIM_IMR_UART1);
break;
case 1:
icrp = (volatile unsigned char *) (MCF_MBAR + MCFSIM_UART2ICR);
*icrp = /*MCFSIM_ICR_AUTOVEC |*/ MCFSIM_ICR_LEVEL6 |
MCFSIM_ICR_PRI2;
mcf_setimr(mcf_getimr() & ~MCFSIM_IMR_UART2);
break;
default:
printk("MCFRS: don't know how to handle UART %d interrupt?\n",
info->line);
return;
}
uartp = info->addr;
uartp[MCFUART_UIVR] = info->irq;
#endif
/* Clear mask, so no surprise interrupts. */
uartp[MCFUART_UIMR] = 0;
if (request_irq(info->irq, mcfrs_interrupt, SA_INTERRUPT,
"ColdFire UART", NULL)) {
printk("MCFRS: Unable to attach ColdFire UART %d interrupt "
"vector=%d\n", info->line, info->irq);
}
return;
}
char *mcfrs_drivername = "ColdFire internal UART serial driver version 1.00\n";
/*
* Serial stats reporting...
*/
int mcfrs_readproc(char *page, char **start, off_t off, int count,
int *eof, void *data)
{
struct mcf_serial *info;
char str[20];
int len, sigs, i;
len = sprintf(page, mcfrs_drivername);
for (i = 0; (i < NR_PORTS); i++) {
info = &mcfrs_table[i];
len += sprintf((page + len), "%d: port:%x irq=%d baud:%d ",
i, (unsigned int) info->addr, info->irq, info->baud);
if (info->stats.rx || info->stats.tx)
len += sprintf((page + len), "tx:%d rx:%d ",
info->stats.tx, info->stats.rx);
if (info->stats.rxframing)
len += sprintf((page + len), "fe:%d ",
info->stats.rxframing);
if (info->stats.rxparity)
len += sprintf((page + len), "pe:%d ",
info->stats.rxparity);
if (info->stats.rxbreak)
len += sprintf((page + len), "brk:%d ",
info->stats.rxbreak);
if (info->stats.rxoverrun)
len += sprintf((page + len), "oe:%d ",
info->stats.rxoverrun);
str[0] = str[1] = 0;
if ((sigs = mcfrs_getsignals(info))) {
if (sigs & TIOCM_RTS)
strcat(str, "|RTS");
if (sigs & TIOCM_CTS)
strcat(str, "|CTS");
if (sigs & TIOCM_DTR)
strcat(str, "|DTR");
if (sigs & TIOCM_CD)
strcat(str, "|CD");
}
len += sprintf((page + len), "%s\n", &str[1]);
}
return(len);
}
/* Finally, routines used to initialize the serial driver. */
static void show_serial_version(void)
{
printk(mcfrs_drivername);
}
static struct tty_operations mcfrs_ops = {
.open = mcfrs_open,
.close = mcfrs_close,
.write = mcfrs_write,
.flush_chars = mcfrs_flush_chars,
.write_room = mcfrs_write_room,
.chars_in_buffer = mcfrs_chars_in_buffer,
.flush_buffer = mcfrs_flush_buffer,
.ioctl = mcfrs_ioctl,
.throttle = mcfrs_throttle,
.unthrottle = mcfrs_unthrottle,
.set_termios = mcfrs_set_termios,
.stop = mcfrs_stop,
.start = mcfrs_start,
.hangup = mcfrs_hangup,
.read_proc = mcfrs_readproc,
.wait_until_sent = mcfrs_wait_until_sent,
.tiocmget = mcfrs_tiocmget,
.tiocmset = mcfrs_tiocmset,
};
/* mcfrs_init inits the driver */
static int __init
mcfrs_init(void)
{
struct mcf_serial *info;
unsigned long flags;
int i;
/* Setup base handler, and timer table. */
#ifdef MCFPP_DCD0
init_timer(&mcfrs_timer_struct);
mcfrs_timer_struct.function = mcfrs_timer;
mcfrs_timer_struct.data = 0;
mcfrs_timer_struct.expires = jiffies + HZ/25;
add_timer(&mcfrs_timer_struct);
mcfrs_ppstatus = mcf_getppdata() & (MCFPP_DCD0 | MCFPP_DCD1);
#endif
mcfrs_serial_driver = alloc_tty_driver(NR_PORTS);
if (!mcfrs_serial_driver)
return -ENOMEM;
show_serial_version();
/* Initialize the tty_driver structure */
mcfrs_serial_driver->owner = THIS_MODULE;
mcfrs_serial_driver->name = "ttyS";
mcfrs_serial_driver->devfs_name = "ttys/";
mcfrs_serial_driver->driver_name = "serial";
mcfrs_serial_driver->major = TTY_MAJOR;
mcfrs_serial_driver->minor_start = 64;
mcfrs_serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
mcfrs_serial_driver->subtype = SERIAL_TYPE_NORMAL;
mcfrs_serial_driver->init_termios = tty_std_termios;
mcfrs_serial_driver->init_termios.c_cflag =
mcfrs_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
mcfrs_serial_driver->flags = TTY_DRIVER_REAL_RAW;
tty_set_operations(mcfrs_serial_driver, &mcfrs_ops);
if (tty_register_driver(mcfrs_serial_driver)) {
printk("MCFRS: Couldn't register serial driver\n");
put_tty_driver(mcfrs_serial_driver);
return(-EBUSY);
}
local_irq_save(flags);
/*
* Configure all the attached serial ports.
*/
for (i = 0, info = mcfrs_table; (i < NR_PORTS); i++, info++) {
info->magic = SERIAL_MAGIC;
info->line = i;
info->tty = 0;
info->custom_divisor = 16;
info->close_delay = 50;
info->closing_wait = 3000;
info->x_char = 0;
info->event = 0;
info->count = 0;
info->blocked_open = 0;
INIT_WORK(&info->tqueue, mcfrs_offintr, info);
INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info);
init_waitqueue_head(&info->open_wait);
init_waitqueue_head(&info->close_wait);
info->imr = 0;
mcfrs_setsignals(info, 0, 0);
mcfrs_irqinit(info);
printk("ttyS%d at 0x%04x (irq = %d)", info->line,
(unsigned int) info->addr, info->irq);
printk(" is a builtin ColdFire UART\n");
}
local_irq_restore(flags);
return 0;
}
module_init(mcfrs_init);
/****************************************************************************/
/* Serial Console */
/****************************************************************************/
/*
* Quick and dirty UART initialization, for console output.
*/
void mcfrs_init_console(void)
{
volatile unsigned char *uartp;
unsigned int clk;
/*
* Reset UART, get it into known state...
*/
uartp = (volatile unsigned char *) (MCF_MBAR +
(mcfrs_console_port ? MCFUART_BASE2 : MCFUART_BASE1));
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 */
/*
* Set port for defined baud , 8 data bits, 1 stop bit, no parity.
*/
uartp[MCFUART_UMR] = MCFUART_MR1_PARITYNONE | MCFUART_MR1_CS8;
uartp[MCFUART_UMR] = MCFUART_MR2_STOP1;
clk = ((MCF_BUSCLK / mcfrs_console_baud) + 16) / 32; /* set baud */
uartp[MCFUART_UBG1] = (clk & 0xff00) >> 8; /* set msb baud */
uartp[MCFUART_UBG2] = (clk & 0xff); /* set lsb baud */
uartp[MCFUART_UCSR] = MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER;
uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE;
mcfrs_console_inited++;
return;
}
/*
* Setup for console. Argument comes from the boot command line.
*/
int mcfrs_console_setup(struct console *cp, char *arg)
{
int i, n = CONSOLE_BAUD_RATE;
if (!cp)
return(-1);
if (!strncmp(cp->name, "ttyS", 4))
mcfrs_console_port = cp->index;
else if (!strncmp(cp->name, "cua", 3))
mcfrs_console_port = cp->index;
else
return(-1);
if (arg)
n = simple_strtoul(arg,NULL,0);
for (i = 0; i < MCFRS_BAUD_TABLE_SIZE; i++)
if (mcfrs_baud_table[i] == n)
break;
if (i < MCFRS_BAUD_TABLE_SIZE) {
mcfrs_console_baud = n;
mcfrs_console_cbaud = 0;
if (i > 15) {
mcfrs_console_cbaud |= CBAUDEX;
i -= 15;
}
mcfrs_console_cbaud |= i;
}
mcfrs_init_console(); /* make sure baud rate changes */
return(0);
}
static struct tty_driver *mcfrs_console_device(struct console *c, int *index)
{
*index = c->index;
return mcfrs_serial_driver;
}
/*
* Output a single character, using UART polled mode.
* This is used for console output.
*/
void mcfrs_put_char(char ch)
{
volatile unsigned char *uartp;
unsigned long flags;
int i;
uartp = (volatile unsigned char *) (MCF_MBAR +
(mcfrs_console_port ? MCFUART_BASE2 : MCFUART_BASE1));
local_irq_save(flags);
for (i = 0; (i < 0x10000); i++) {
if (uartp[MCFUART_USR] & MCFUART_USR_TXREADY)
break;
}
if (i < 0x10000) {
uartp[MCFUART_UTB] = ch;
for (i = 0; (i < 0x10000); i++)
if (uartp[MCFUART_USR] & MCFUART_USR_TXEMPTY)
break;
}
if (i >= 0x10000)
mcfrs_init_console(); /* try and get it back */
local_irq_restore(flags);
return;
}
/*
* rs_console_write is registered for printk output.
*/
void mcfrs_console_write(struct console *cp, const char *p, unsigned len)
{
if (!mcfrs_console_inited)
mcfrs_init_console();
while (len-- > 0) {
if (*p == '\n')
mcfrs_put_char('\r');
mcfrs_put_char(*p++);
}
}
/*
* declare our consoles
*/
struct console mcfrs_console = {
.name = "ttyS",
.write = mcfrs_console_write,
.device = mcfrs_console_device,
.setup = mcfrs_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
};
static int __init mcfrs_console_init(void)
{
register_console(&mcfrs_console);
return 0;
}
console_initcall(mcfrs_console_init);
/****************************************************************************/
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