Viewing file:  serial_tx3912.c (27.3 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* drivers/char/serial_tx3912.c
*
* Copyright (C) 1999 Harald Koerfgen
* Copyright (C) 2000 Jim Pick <jim@jimpick.com>
* Copyright (C) 2001 Steven J. Hill (sjhill@realitydiluted.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Serial driver for TMPR3912/05 and PR31700 processors
*/
#include <linux/init.h>
#include <linux/config.h>
#include <linux/tty.h>
#include <linux/major.h>
#include <linux/ptrace.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/delay.h>
#include <asm/wbflush.h>
#include <asm/tx3912.h>
#include "serial_tx3912.h"
/*
* Forward declarations for serial routines
*/
static void rs_disable_tx_interrupts (void * ptr);
static void rs_enable_tx_interrupts (void * ptr);
static void rs_disable_rx_interrupts (void * ptr);
static void rs_enable_rx_interrupts (void * ptr);
static int rs_get_CD (void * ptr);
static void rs_shutdown_port (void * ptr);
static int rs_set_real_termios (void *ptr);
static int rs_chars_in_buffer (void * ptr);
static void rs_hungup (void *ptr);
static void rs_close (void *ptr);
/*
* Used by generic serial driver to access hardware
*/
static struct real_driver rs_real_driver = {
disable_tx_interrupts: rs_disable_tx_interrupts,
enable_tx_interrupts: rs_enable_tx_interrupts,
disable_rx_interrupts: rs_disable_rx_interrupts,
enable_rx_interrupts: rs_enable_rx_interrupts,
get_CD: rs_get_CD,
shutdown_port: rs_shutdown_port,
set_real_termios: rs_set_real_termios,
chars_in_buffer: rs_chars_in_buffer,
close: rs_close,
hungup: rs_hungup,
};
/*
* Structures and such for TTY sessions and usage counts
*/
static struct tty_driver rs_driver, rs_callout_driver;
static struct tty_struct * rs_table[TX3912_UART_NPORTS] = { NULL, };
static struct termios ** rs_termios;
static struct termios ** rs_termios_locked;
struct rs_port *rs_ports;
int rs_refcount;
int rs_initialized = 0;
/*
* ----------------------------------------------------------------------
*
* Here starts the interrupt handling routines. All of the following
* subroutines are declared as inline and are folded into
* rs_interrupt(). They were separated out for readability's sake.
*
* Note: rs_interrupt() is a "fast" interrupt, which means that it
* runs with interrupts turned off. People who may want to modify
* rs_interrupt() should try to keep the interrupt handler as fast as
* possible. After you are done making modifications, it is not a bad
* idea to do:
*
* gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
*
* and look at the resulting assemble code in serial.s.
*
* - Ted Ts'o (tytso@mit.edu), 7-Mar-93
* -----------------------------------------------------------------------
*/
static inline void receive_char_pio(struct rs_port *port)
{
struct tty_struct *tty = port->gs.tty;
unsigned char ch;
int counter = 2048;
/* While there are characters, get them ... */
while (counter>0) {
if (!(inl(port->base + TX3912_UART_CTRL1) & UART_RX_HOLD_FULL))
break;
ch = inb(port->base + TX3912_UART_DATA);
if (tty->flip.count < TTY_FLIPBUF_SIZE) {
*tty->flip.char_buf_ptr++ = ch;
*tty->flip.flag_buf_ptr++ = 0;
tty->flip.count++;
}
udelay(1); /* Allow things to happen - it take a while */
counter--;
}
if (!counter)
printk( "Ugh, looped in receive_char_pio!\n" );
tty_flip_buffer_push(tty);
#if 0
/* Now handle error conditions */
if (*status & (INTTYPE(UART_RXOVERRUN_INT) |
INTTYPE(UART_FRAMEERR_INT) |
INTTYPE(UART_PARITYERR_INT) |
INTTYPE(UART_BREAK_INT))) {
/*
* Now check to see if character should be
* ignored, and mask off conditions which
* should be ignored.
*/
if (*status & port->ignore_status_mask) {
goto ignore_char;
}
*status &= port->read_status_mask;
if (*status & INTTYPE(UART_BREAK_INT)) {
rs_dprintk(TX3912_UART_DEBUG_INTERRUPTS, "handling break....");
*tty->flip.flag_buf_ptr = TTY_BREAK;
}
else if (*status & INTTYPE(UART_PARITYERR_INT)) {
*tty->flip.flag_buf_ptr = TTY_PARITY;
}
else if (*status & INTTYPE(UART_FRAMEERR_INT)) {
*tty->flip.flag_buf_ptr = TTY_FRAME;
}
if (*status & INTTYPE(UART_RXOVERRUN_INT)) {
/*
* Overrun is special, since it's
* reported immediately, and doesn't
* affect the current character
*/
if (tty->flip.count < TTY_FLIPBUF_SIZE) {
tty->flip.count++;
tty->flip.flag_buf_ptr++;
tty->flip.char_buf_ptr++;
*tty->flip.flag_buf_ptr = TTY_OVERRUN;
}
}
}
tty->flip.flag_buf_ptr++;
tty->flip.char_buf_ptr++;
tty->flip.count++;
ignore_char:
tty_flip_buffer_push(tty);
#endif
}
static inline void transmit_char_pio(struct rs_port *port)
{
/* While I'm able to transmit ... */
for (;;) {
if (!(inl(port->base + TX3912_UART_CTRL1) & UART_TX_EMPTY))
break;
else if (port->x_char) {
outb(port->x_char, port->base + TX3912_UART_DATA);
port->icount.tx++;
port->x_char = 0;
}
else if (port->gs.xmit_cnt <= 0 || port->gs.tty->stopped ||
port->gs.tty->hw_stopped) {
break;
}
else {
outb(port->gs.xmit_buf[port->gs.xmit_tail++],
port->base + TX3912_UART_DATA);
port->icount.tx++;
port->gs.xmit_tail &= SERIAL_XMIT_SIZE-1;
if (--port->gs.xmit_cnt <= 0) {
break;
}
}
udelay(10); /* Allow things to happen - it take a while */
}
if (port->gs.xmit_cnt <= 0 || port->gs.tty->stopped ||
port->gs.tty->hw_stopped) {
rs_disable_tx_interrupts(port);
}
if (port->gs.xmit_cnt <= port->gs.wakeup_chars) {
if ((port->gs.tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
port->gs.tty->ldisc.write_wakeup)
(port->gs.tty->ldisc.write_wakeup)(port->gs.tty);
rs_dprintk (TX3912_UART_DEBUG_TRANSMIT, "Waking up.... ldisc (%d)....\n",
port->gs.wakeup_chars);
wake_up_interruptible(&port->gs.tty->write_wait);
}
}
static inline void check_modem_status(struct rs_port *port)
{
/* We don't have a carrier detect line - but just respond
like we had one anyways so that open() becomes unblocked */
wake_up_interruptible(&port->gs.open_wait);
}
int count = 0;
/*
* This is the serial driver's interrupt routine (inlined, because
* there are two different versions of this, one for each serial port,
* differing only by the bits used in interrupt status 2 register)
*/
static inline void rs_rx_interrupt(int irq, void *dev_id,
struct pt_regs * regs, int intshift)
{
struct rs_port * port;
unsigned long int2status;
unsigned long flags;
unsigned long ints;
save_and_cli(flags);
port = (struct rs_port *)dev_id;
rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "rs_interrupt (port %p, shift %d)...", port, intshift);
/* Get the interrrupts we have enabled */
int2status = IntStatus2 & IntEnable2;
/* Get interrupts in easy to use form */
ints = int2status >> intshift;
/* Clear any interrupts we might be about to handle */
IntClear2 = int2status & (
(INTTYPE(UART_RXOVERRUN_INT) |
INTTYPE(UART_FRAMEERR_INT) |
INTTYPE(UART_BREAK_INT) |
INTTYPE(UART_PARITYERR_INT) |
INTTYPE(UART_RX_INT)) << intshift);
if (!port || !port->gs.tty) {
restore_flags(flags);
return;
}
/* RX Receiver Holding Register Overrun */
if (ints & INTTYPE(UART_RXOVERRUN_INT)) {
rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "overrun");
port->icount.overrun++;
}
/* RX Frame Error */
if (ints & INTTYPE(UART_FRAMEERR_INT)) {
rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "frame error");
port->icount.frame++;
}
/* Break signal received */
if (ints & INTTYPE(UART_BREAK_INT)) {
rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "break");
port->icount.brk++;
}
/* RX Parity Error */
if (ints & INTTYPE(UART_PARITYERR_INT)) {
rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "parity error");
port->icount.parity++;
}
/* Receive byte (non-DMA) */
if (ints & INTTYPE(UART_RX_INT)) {
receive_char_pio(port);
}
restore_flags(flags);
rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "end.\n");
}
static inline void rs_tx_interrupt(int irq, void *dev_id,
struct pt_regs * regs, int intshift)
{
struct rs_port * port;
unsigned long int2status;
unsigned long flags;
unsigned long ints;
save_and_cli(flags);
port = (struct rs_port *)dev_id;
rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "rs_interrupt (port %p, shift %d)...", port, intshift);
/* Get the interrrupts we have enabled */
int2status = IntStatus2 & IntEnable2;
if (!port || !port->gs.tty) {
restore_flags(flags);
return;
}
/* Get interrupts in easy to use form */
ints = int2status >> intshift;
/* Clear any interrupts we might be about to handle */
IntClear2 = int2status & (
(INTTYPE(UART_TX_INT) |
INTTYPE(UART_EMPTY_INT) |
INTTYPE(UART_TXOVERRUN_INT)) << intshift);
/* TX holding register empty, so transmit byte (non-DMA) */
if (ints & (INTTYPE(UART_TX_INT) | INTTYPE(UART_EMPTY_INT))) {
transmit_char_pio(port);
}
/* TX Transmit Holding Register Overrun (shouldn't happen) */
if (ints & INTTYPE(UART_TXOVERRUN_INT)) {
printk ( "rs: TX overrun\n");
}
/*
check_modem_status();
*/
restore_flags(flags);
rs_dprintk (TX3912_UART_DEBUG_INTERRUPTS, "end.\n");
}
static void rs_rx_interrupt_uarta(int irq, void *dev_id,
struct pt_regs * regs)
{
rs_rx_interrupt(irq, dev_id, regs, UARTA_SHIFT);
}
static void rs_tx_interrupt_uarta(int irq, void *dev_id,
struct pt_regs * regs)
{
rs_tx_interrupt(irq, dev_id, regs, UARTA_SHIFT);
}
/*
***********************************************************************
* Here are the routines that actually *
* interface with the generic_serial driver *
***********************************************************************
*/
static void rs_disable_tx_interrupts (void * ptr)
{
struct rs_port *port = ptr;
unsigned long flags;
save_and_cli(flags);
port->gs.flags &= ~GS_TX_INTEN;
IntEnable2 &= ~((INTTYPE(UART_TX_INT) |
INTTYPE(UART_EMPTY_INT) |
INTTYPE(UART_TXOVERRUN_INT)) << port->intshift);
IntClear2 = (INTTYPE(UART_TX_INT) |
INTTYPE(UART_EMPTY_INT) |
INTTYPE(UART_TXOVERRUN_INT)) << port->intshift;
restore_flags(flags);
}
static void rs_enable_tx_interrupts (void * ptr)
{
struct rs_port *port = ptr;
unsigned long flags;
save_and_cli(flags);
IntClear2 = (INTTYPE(UART_TX_INT) |
INTTYPE(UART_EMPTY_INT) |
INTTYPE(UART_TXOVERRUN_INT)) << port->intshift;
IntEnable2 |= (INTTYPE(UART_TX_INT) |
INTTYPE(UART_EMPTY_INT) |
INTTYPE(UART_TXOVERRUN_INT)) << port->intshift;
/* Send a char to start TX interrupts happening */
transmit_char_pio(port);
restore_flags(flags);
}
static void rs_disable_rx_interrupts (void * ptr)
{
struct rs_port *port = ptr;
unsigned long flags;
save_and_cli(flags);
IntEnable2 &= ~((INTTYPE(UART_RX_INT) |
INTTYPE(UART_RXOVERRUN_INT) |
INTTYPE(UART_FRAMEERR_INT) |
INTTYPE(UART_BREAK_INT) |
INTTYPE(UART_PARITYERR_INT)) << port->intshift);
IntClear2 = (INTTYPE(UART_RX_INT) |
INTTYPE(UART_RXOVERRUN_INT) |
INTTYPE(UART_FRAMEERR_INT) |
INTTYPE(UART_BREAK_INT) |
INTTYPE(UART_PARITYERR_INT)) << port->intshift;
restore_flags(flags);
}
static void rs_enable_rx_interrupts (void * ptr)
{
struct rs_port *port = ptr;
unsigned long flags;
save_and_cli(flags);
IntEnable2 |= (INTTYPE(UART_RX_INT) |
INTTYPE(UART_RXOVERRUN_INT) |
INTTYPE(UART_FRAMEERR_INT) |
INTTYPE(UART_BREAK_INT) |
INTTYPE(UART_PARITYERR_INT)) << port->intshift;
/* Empty the input buffer - apparently this is *vital* */
while (inl(port->base + TX3912_UART_CTRL1) & UART_RX_HOLD_FULL) {
inb(port->base + TX3912_UART_DATA);
}
IntClear2 = (INTTYPE(UART_RX_INT) |
INTTYPE(UART_RXOVERRUN_INT) |
INTTYPE(UART_FRAMEERR_INT) |
INTTYPE(UART_BREAK_INT) |
INTTYPE(UART_PARITYERR_INT)) << port->intshift;
restore_flags(flags);
}
static int rs_get_CD (void * ptr)
{
/* No Carried Detect in Hardware - just return true */
func_exit();
return (1);
}
static void rs_shutdown_port (void * ptr)
{
struct rs_port *port = ptr;
func_enter();
port->gs.flags &= ~GS_ACTIVE;
func_exit();
}
static int rs_set_real_termios (void *ptr)
{
struct rs_port *port = ptr;
int t;
switch (port->gs.baud) {
/* Save some typing work... */
#define e(x) case x:t= TX3912_UART_CTRL2_B ## x ; break
e(300);e(600);e(1200);e(2400);e(4800);e(9600);
e(19200);e(38400);e(57600);e(76800);e(115200);e(230400);
case 0 :t = -1;
break;
default:
/* Can I return "invalid"? */
t = TX3912_UART_CTRL2_B9600;
printk (KERN_INFO "rs: unsupported baud rate: %d.\n", port->gs.baud);
break;
}
#undef e
if (t >= 0) {
/* Jim: Set Hardware Baud rate - there is some good
code in drivers/char/serial.c */
/* Program hardware for parity, data bits, stop bits (note: these are hardcoded to 8N1 */
UartA_Ctrl1 &= 0xf000000f;
UartA_Ctrl1 &= ~(UART_DIS_TXD | SER_SEVEN_BIT | SER_EVEN_PARITY | SER_TWO_STOP);
#define CFLAG port->gs.tty->termios->c_cflag
if (C_PARENB(port->gs.tty)) {
if (!C_PARODD(port->gs.tty))
UartA_Ctrl1 |= SER_EVEN_PARITY;
else
UartA_Ctrl1 |= SER_ODD_PARITY;
}
if ((CFLAG & CSIZE)==CS6)
printk(KERN_ERR "6 bits not supported\n");
if ((CFLAG & CSIZE)==CS5)
printk(KERN_ERR "5 bits not supported\n");
if ((CFLAG & CSIZE)==CS7)
UartA_Ctrl1 |= SER_SEVEN_BIT;
if (C_CSTOPB(port->gs.tty))
UartA_Ctrl1 |= SER_TWO_STOP;
outl(t, port->base + TX3912_UART_CTRL2);
outl(0, port->base + TX3912_UART_DMA_CTRL1);
outl(0, port->base + TX3912_UART_DMA_CTRL2);
UartA_Ctrl1 |= TX3912_UART_CTRL1_UARTON;
/* wait until UARTA is stable */
while (~UartA_Ctrl1 & TX3912_UART_CTRL1_UARTON);
}
func_exit ();
return 0;
}
static int rs_chars_in_buffer (void * ptr)
{
struct rs_port *port = ptr;
int scratch;
scratch = inl(port->base + TX3912_UART_CTRL1);
return ((scratch & UART_TX_EMPTY) ? 0 : 1);
}
/* ********************************************************************** *
* Here are the routines that actually *
* interface with the rest of the system *
* ********************************************************************** */
static int rs_open (struct tty_struct * tty, struct file * filp)
{
struct rs_port *port;
int retval, line;
func_enter();
if (!rs_initialized) {
return -EIO;
}
line = MINOR(tty->device) - tty->driver.minor_start;
rs_dprintk (TX3912_UART_DEBUG_OPEN, "%d: opening line %d. tty=%p ctty=%p)\n",
(int) current->pid, line, tty, current->tty);
if ((line < 0) || (line >= TX3912_UART_NPORTS))
return -ENODEV;
/* Pre-initialized already */
port = & rs_ports[line];
rs_dprintk (TX3912_UART_DEBUG_OPEN, "port = %p\n", port);
tty->driver_data = port;
port->gs.tty = tty;
port->gs.count++;
rs_dprintk (TX3912_UART_DEBUG_OPEN, "starting port\n");
/*
* Start up serial port
*/
retval = gs_init_port(&port->gs);
rs_dprintk (TX3912_UART_DEBUG_OPEN, "done gs_init\n");
if (retval) {
port->gs.count--;
return retval;
}
port->gs.flags |= GS_ACTIVE;
rs_dprintk (TX3912_UART_DEBUG_OPEN, "before inc_use_count (count=%d.\n",
port->gs.count);
if (port->gs.count == 1) {
MOD_INC_USE_COUNT;
}
rs_dprintk (TX3912_UART_DEBUG_OPEN, "after inc_use_count\n");
/* Jim: Initialize port hardware here */
/* Enable high-priority interrupts for UARTA */
IntEnable6 |= INT6_UARTARXINT;
rs_enable_rx_interrupts(&rs_ports[0]);
retval = gs_block_til_ready(&port->gs, filp);
rs_dprintk (TX3912_UART_DEBUG_OPEN, "Block til ready returned %d. Count=%d\n",
retval, port->gs.count);
if (retval) {
MOD_DEC_USE_COUNT;
port->gs.count--;
return retval;
}
/* tty->low_latency = 1; */
if ((port->gs.count == 1) && (port->gs.flags & ASYNC_SPLIT_TERMIOS)) {
if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
*tty->termios = port->gs.normal_termios;
else
*tty->termios = port->gs.callout_termios;
rs_set_real_termios (port);
}
port->gs.session = current->session;
port->gs.pgrp = current->pgrp;
func_exit();
/* Jim */
/* cli(); */
return 0;
}
static void rs_close (void *ptr)
{
func_enter ();
/* Anything to do here? */
MOD_DEC_USE_COUNT;
func_exit ();
}
/* I haven't the foggiest why the decrement use count has to happen
here. The whole linux serial drivers stuff needs to be redesigned.
My guess is that this is a hack to minimize the impact of a bug
elsewhere. Thinking about it some more. (try it sometime) Try
running minicom on a serial port that is driven by a modularized
driver. Have the modem hangup. Then remove the driver module. Then
exit minicom. I expect an "oops". -- REW */
static void rs_hungup (void *ptr)
{
func_enter ();
MOD_DEC_USE_COUNT;
func_exit ();
}
static int rs_ioctl (struct tty_struct * tty, struct file * filp,
unsigned int cmd, unsigned long arg)
{
int rc;
struct rs_port *port = tty->driver_data;
int ival;
rc = 0;
switch (cmd) {
case TIOCGSOFTCAR:
rc = put_user(((tty->termios->c_cflag & CLOCAL) ? 1 : 0),
(unsigned int *) arg);
break;
case TIOCSSOFTCAR:
if ((rc = verify_area(VERIFY_READ, (void *) arg,
sizeof(int))) == 0) {
get_user(ival, (unsigned int *) arg);
tty->termios->c_cflag =
(tty->termios->c_cflag & ~CLOCAL) |
(ival ? CLOCAL : 0);
}
break;
case TIOCGSERIAL:
if ((rc = verify_area(VERIFY_WRITE, (void *) arg,
sizeof(struct serial_struct))) == 0)
rc = gs_getserial(&port->gs, (struct serial_struct *) arg);
break;
case TIOCSSERIAL:
if ((rc = verify_area(VERIFY_READ, (void *) arg,
sizeof(struct serial_struct))) == 0)
rc = gs_setserial(&port->gs, (struct serial_struct *) arg);
break;
default:
rc = -ENOIOCTLCMD;
break;
}
/* func_exit(); */
return rc;
}
/*
* This function is used to send a high-priority XON/XOFF character to
* the device
*/
static void rs_send_xchar(struct tty_struct * tty, char ch)
{
struct rs_port *port = (struct rs_port *)tty->driver_data;
func_enter ();
port->x_char = ch;
if (ch) {
/* Make sure transmit interrupts are on */
rs_enable_tx_interrupts(tty);
}
func_exit();
}
/*
* ------------------------------------------------------------
* rs_throttle()
*
* This routine is called by the upper-layer tty layer to signal that
* incoming characters should be throttled.
* ------------------------------------------------------------
*/
static void rs_throttle(struct tty_struct * tty)
{
#ifdef TX3912_UART_DEBUG_THROTTLE
char buf[64];
printk("throttle %s: %d....\n", tty_name(tty, buf),
tty->ldisc.chars_in_buffer(tty));
#endif
func_enter ();
if (I_IXOFF(tty))
rs_send_xchar(tty, STOP_CHAR(tty));
func_exit ();
}
static void rs_unthrottle(struct tty_struct * tty)
{
struct rs_port *port = (struct rs_port *)tty->driver_data;
#ifdef TX3912_UART_DEBUG_THROTTLE
char buf[64];
printk("unthrottle %s: %d....\n", tty_name(tty, buf),
tty->ldisc.chars_in_buffer(tty));
#endif
func_enter();
if (I_IXOFF(tty)) {
if (port->x_char)
port->x_char = 0;
else
rs_send_xchar(tty, START_CHAR(tty));
}
func_exit();
}
/* ********************************************************************** *
* Here are the initialization routines. *
* ********************************************************************** */
void * ckmalloc (int size)
{
void *p;
p = kmalloc(size, GFP_KERNEL);
if (p)
memset(p, 0, size);
return p;
}
static int rs_init_portstructs(void)
{
struct rs_port *port;
int i;
/* Debugging */
func_enter();
rs_ports = ckmalloc(TX3912_UART_NPORTS * sizeof (struct rs_port));
if (!rs_ports)
return -ENOMEM;
rs_termios = ckmalloc(TX3912_UART_NPORTS * sizeof (struct termios *));
if (!rs_termios) {
kfree (rs_ports);
return -ENOMEM;
}
rs_termios_locked = ckmalloc(TX3912_UART_NPORTS * sizeof (struct termios *));
if (!rs_termios_locked) {
kfree (rs_ports);
kfree (rs_termios);
return -ENOMEM;
}
/* Adjust the values in the "driver" */
rs_driver.termios = rs_termios;
rs_driver.termios_locked = rs_termios_locked;
port = rs_ports;
for (i=0; i < TX3912_UART_NPORTS;i++) {
rs_dprintk (TX3912_UART_DEBUG_INIT, "initing port %d\n", i);
port->gs.callout_termios = tty_std_termios;
port->gs.normal_termios = tty_std_termios;
port->gs.magic = SERIAL_MAGIC;
port->gs.close_delay = HZ/2;
port->gs.closing_wait = 30 * HZ;
port->gs.rd = &rs_real_driver;
#ifdef NEW_WRITE_LOCKING
port->gs.port_write_sem = MUTEX;
#endif
#ifdef DECLARE_WAITQUEUE
init_waitqueue_head(&port->gs.open_wait);
init_waitqueue_head(&port->gs.close_wait);
#endif
port->base = (i == 0) ? TX3912_UARTA_BASE : TX3912_UARTB_BASE;
port->intshift = (i == 0) ? UARTA_SHIFT : UARTB_SHIFT;
rs_dprintk (TX3912_UART_DEBUG_INIT, "base 0x%08lx intshift %d\n",
port->base, port->intshift);
port++;
}
func_exit();
return 0;
}
static int rs_init_drivers(void)
{
int error;
func_enter();
memset(&rs_driver, 0, sizeof(rs_driver));
rs_driver.magic = TTY_DRIVER_MAGIC;
rs_driver.driver_name = "serial";
rs_driver.name = "ttyS";
rs_driver.major = TTY_MAJOR;
rs_driver.minor_start = 64;
rs_driver.num = TX3912_UART_NPORTS;
rs_driver.type = TTY_DRIVER_TYPE_SERIAL;
rs_driver.subtype = SERIAL_TYPE_NORMAL;
rs_driver.init_termios = tty_std_termios;
rs_driver.init_termios.c_cflag =
B115200 | CS8 | CREAD | HUPCL | CLOCAL;
rs_driver.refcount = &rs_refcount;
rs_driver.table = rs_table;
rs_driver.termios = rs_termios;
rs_driver.termios_locked = rs_termios_locked;
rs_driver.open = rs_open;
rs_driver.close = gs_close;
rs_driver.write = gs_write;
rs_driver.put_char = gs_put_char;
rs_driver.flush_chars = gs_flush_chars;
rs_driver.write_room = gs_write_room;
rs_driver.chars_in_buffer = gs_chars_in_buffer;
rs_driver.flush_buffer = gs_flush_buffer;
rs_driver.ioctl = rs_ioctl;
rs_driver.throttle = rs_throttle;
rs_driver.unthrottle = rs_unthrottle;
rs_driver.set_termios = gs_set_termios;
rs_driver.stop = gs_stop;
rs_driver.start = gs_start;
rs_driver.hangup = gs_hangup;
rs_callout_driver = rs_driver;
rs_callout_driver.name = "cua";
rs_callout_driver.major = TTYAUX_MAJOR;
rs_callout_driver.subtype = SERIAL_TYPE_CALLOUT;
if ((error = tty_register_driver(&rs_driver))) {
printk(KERN_ERR "Couldn't register serial driver, error = %d\n",
error);
return 1;
}
if ((error = tty_register_driver(&rs_callout_driver))) {
tty_unregister_driver(&rs_driver);
printk(KERN_ERR "Couldn't register callout driver, error = %d\n",
error);
return 1;
}
func_exit();
return 0;
}
void __init tx3912_rs_init(void)
{
int rc;
func_enter();
rs_dprintk (TX3912_UART_DEBUG_INIT, "Initing serial module... (rs_debug=%d)\n", rs_debug);
rc = rs_init_portstructs ();
rs_init_drivers ();
if (request_irq(2, rs_tx_interrupt_uarta, SA_SHIRQ | SA_INTERRUPT,
"serial", &rs_ports[0])) {
printk(KERN_ERR "rs: Cannot allocate irq for UARTA.\n");
rc = 0;
}
if (request_irq(3, rs_rx_interrupt_uarta, SA_SHIRQ | SA_INTERRUPT,
"serial", &rs_ports[0])) {
printk(KERN_ERR "rs: Cannot allocate irq for UARTA.\n");
rc = 0;
}
IntEnable6 |= INT6_UARTARXINT;
rs_enable_rx_interrupts(&rs_ports[0]);
#ifndef CONFIG_SERIAL_TX3912_CONSOLE
{
unsigned int scratch = 0;
/* Setup master clock for UART */
scratch = inl(TX3912_CLK_CTRL_BASE);
scratch &= ~TX3912_CLK_CTRL_SIBMCLKDIV_MASK;
scratch |= ((0x2 << TX3912_CLK_CTRL_SIBMCLKDIV_SHIFT) &
TX3912_CLK_CTRL_SIBMCLKDIV_MASK)
| TX3912_CLK_CTRL_SIBMCLKDIR
| TX3912_CLK_CTRL_ENSIBMCLK
| TX3912_CLK_CTRL_CSERSEL;
outl(scratch, TX3912_CLK_CTRL_BASE);
/* Configure UARTA clock */
scratch = inl(TX3912_CLK_CTRL_BASE);
scratch |= ((0x3 << TX3912_CLK_CTRL_CSERDIV_SHIFT) &
TX3912_CLK_CTRL_CSERDIV_MASK)
| TX3912_CLK_CTRL_ENCSERCLK
| TX3912_CLK_CTRL_ENUARTACLK;
outl(scratch, TX3912_CLK_CTRL_BASE);
/* Setup UARTA for 115200,8N1 */
outl(0, TX3912_UARTA_BASE + TX3912_UART_CTRL1);
outl(TX3912_UART_CTRL2_B115200, TX3912_UARTA_BASE + TX3912_UART_CTRL2);
outl(0, TX3912_UARTA_BASE + TX3912_UART_DMA_CTRL1);
outl(0, TX3912_UARTA_BASE + TX3912_UART_DMA_CTRL2);
/* Enable UARTA */
outl(TX3912_UART_CTRL1_ENUART, TX3912_UARTA_BASE + TX3912_UART_CTRL1);
while (~inl(TX3912_UARTA_BASE + TX3912_UART_CTRL1) &
TX3912_UART_CTRL1_UARTON);
}
#endif
/* Note: I didn't do anything to enable the second UART */
if (rc >= 0)
rs_initialized++;
func_exit();
}
/*
* Begin serial console routines
*/
#ifdef CONFIG_SERIAL_TX3912_CONSOLE
void serial_outc(unsigned char c)
{
int i;
unsigned long int2;
#define BUSY_WAIT 10000
/*
* Turn UARTA interrupts off
*/
int2 = IntEnable2;
IntEnable2 &=
~(INT2_UARTATXINT | INT2_UARTATXOVERRUN | INT2_UARTAEMPTY);
/*
* The UART_TX_EMPTY bit in UartA_Ctrl1 seems
* not to be very reliable :-(
*
* Wait for the Tx register to become empty
*/
for (i = 0; !(IntStatus2 & INT2_UARTATXINT) && (i < BUSY_WAIT); i++);
IntClear2 = INT2_UARTATXINT | INT2_UARTATXOVERRUN | INT2_UARTAEMPTY;
UartA_Data = c;
for (i = 0; !(IntStatus2 & INT2_UARTATXINT) && (i < BUSY_WAIT); i++);
IntClear2 = INT2_UARTATXINT | INT2_UARTATXOVERRUN | INT2_UARTAEMPTY;
IntEnable2 = int2;
}
static int serial_console_wait_key(struct console *co)
{
unsigned int int2, res;
int2 = IntEnable2;
IntEnable2 = 0;
while (!(UartA_Ctrl1 & UART_RX_HOLD_FULL));
res = UartA_Data;
udelay(10);
IntEnable2 = int2;
return res;
}
static void serial_console_write(struct console *co, const char *s,
unsigned count)
{
unsigned int i;
for (i = 0; i < count; i++) {
if (*s == '\n')
serial_outc('\r');
serial_outc(*s++);
}
}
static kdev_t serial_console_device(struct console *c)
{
return MKDEV(TTY_MAJOR, 64 + c->index);
}
static __init int serial_console_setup(struct console *co, char *options)
{
unsigned int scratch = 0;
/* Setup master clock for UART */
scratch = inl(TX3912_CLK_CTRL_BASE);
scratch &= ~TX3912_CLK_CTRL_SIBMCLKDIV_MASK;
scratch |= ((0x2 << TX3912_CLK_CTRL_SIBMCLKDIV_SHIFT) &
TX3912_CLK_CTRL_SIBMCLKDIV_MASK)
| TX3912_CLK_CTRL_SIBMCLKDIR
| TX3912_CLK_CTRL_ENSIBMCLK
| TX3912_CLK_CTRL_CSERSEL;
outl(scratch, TX3912_CLK_CTRL_BASE);
/* Configure UARTA clock */
scratch = inl(TX3912_CLK_CTRL_BASE);
scratch |= ((0x3 << TX3912_CLK_CTRL_CSERDIV_SHIFT) &
TX3912_CLK_CTRL_CSERDIV_MASK)
| TX3912_CLK_CTRL_ENCSERCLK
| TX3912_CLK_CTRL_ENUARTACLK;
outl(scratch, TX3912_CLK_CTRL_BASE);
/* Setup UARTA for 115200,8N1 */
outl(0, TX3912_UARTA_BASE + TX3912_UART_CTRL1);
outl(TX3912_UART_CTRL2_B115200, TX3912_UARTA_BASE + TX3912_UART_CTRL2);
outl(0, TX3912_UARTA_BASE + TX3912_UART_DMA_CTRL1);
outl(0, TX3912_UARTA_BASE + TX3912_UART_DMA_CTRL2);
/* Enable UARTA */
outl(TX3912_UART_CTRL1_ENUART, TX3912_UARTA_BASE + TX3912_UART_CTRL1);
while (~inl(TX3912_UARTA_BASE + TX3912_UART_CTRL1) &
TX3912_UART_CTRL1_UARTON);
return 0;
}
static struct console sercons = {
name: "ttyS",
write: serial_console_write,
device: serial_console_device,
wait_key: serial_console_wait_key,
setup: serial_console_setup,
flags: CON_PRINTBUFFER,
index: -1
};
void __init tx3912_console_init(void)
{
register_console(&sercons);
}
#endif
|