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linux/drivers/serial/mcfserial.c
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

1926 lines
47 KiB
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)
#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,
},
{ /* 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, 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(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_M523x) || 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 = 0x30 + info->line; /* level 6, line based priority */
imrp = (volatile unsigned long *) (MCF_MBAR + MCFICM_INTC0 +
MCFINTC_IMRL);
*imrp &= ~((1 << (info->irq - MCFINT_VECBASE)) | 1);
#elif defined(CONFIG_M520x)
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 = 0x03;
imrp = (volatile unsigned long *) (MCF_MBAR + MCFICM_INTC0 +
MCFINTC_IMRL);
*imrp &= ~((1 << (info->irq - MCFINT_VECBASE)) | 1);
if (info->line < 2) {
unsigned short *uart_par;
uart_par = (unsigned short *)(MCF_IPSBAR + MCF_GPIO_PAR_UART);
if (info->line == 0)
*uart_par |= MCF_GPIO_PAR_UART_PAR_UTXD0
| MCF_GPIO_PAR_UART_PAR_URXD0;
else if (info->line == 1)
*uart_par |= MCF_GPIO_PAR_UART_PAR_UTXD1
| MCF_GPIO_PAR_UART_PAR_URXD1;
} else if (info->line == 2) {
unsigned char *feci2c_par;
feci2c_par = (unsigned char *)(MCF_IPSBAR + MCF_GPIO_PAR_FECI2C);
*feci2c_par &= ~0x0F;
*feci2c_par |= MCF_GPIO_PAR_FECI2C_PAR_SCL_UTXD2
| MCF_GPIO_PAR_FECI2C_PAR_SDA_URXD2;
}
#elif defined(CONFIG_M532x)
volatile unsigned char *uartp;
uartp = info->addr;
switch (info->line) {
case 0:
MCF_INTC0_ICR26 = 0x3;
MCF_INTC0_CIMR = 26;
/* GPIO initialization */
MCF_GPIO_PAR_UART |= 0x000F;
break;
case 1:
MCF_INTC0_ICR27 = 0x3;
MCF_INTC0_CIMR = 27;
/* GPIO initialization */
MCF_GPIO_PAR_UART |= 0x0FF0;
break;
case 2:
MCF_INTC0_ICR28 = 0x3;
MCF_INTC0_CIMR = 28;
/* GPIOs also must be initalized, depends on board */
break;
}
#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, IRQF_DISABLED,
"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 const 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->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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