www.pudn.com > 44b0-232-ucLINUX-driver.rar > 44b0232-uclinux-driver.c, change:2004-12-13,size:98096b
/*
* linux/drivers/char/serial_44b0.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
* Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
* 1998, 1999 Theodore Ts'o
*
* Extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92. Now
* much more extensible to support other serial cards based on the
* 16450/16550A UART's. Added support for the AST FourPort and the
* Accent Async board.
*
* set_serial_info fixed to set the flags, custom divisor, and uart
* type fields. Fix suggested by Michael K. Johnson 12/12/92.
*
* 11/95: TIOCMIWAIT, TIOCGICOUNT by Angelo Haritsis
*
* 03/96: Modularised by Angelo Haritsis
*
* rs_set_termios fixed to look also for changes of the input
* flags INPCK, BRKINT, PARMRK, IGNPAR and IGNBRK.
* Bernd Anh鋟pl 05/17/96.
*
* 1/97: Extended dumb serial ports are a config option now.
* Saves 4k. Michael A. Griffith
*
* 8/97: Fix bug in rs_set_termios with RTS
* Stanislav V. Voronyi
*
* 3/98: Change the IRQ detection, use of probe_irq_o*(),
* suppress TIOCSERGWILD and TIOCSERSWILD
* Etienne Lorrain
*
* 4/98: Added changes to support the ARM architecture proposed by
* Russell King
*
* 5/99: Updated to include support for the XR16C850 and ST16C654
* uarts. Stuart MacDonald
*
* 8/99: Generalized PCI support added. Theodore Ts'o
*
* 3/00: Rid circular buffer of redundant xmit_cnt. Fix a
* few races on freeing buffers too.
* Alan Modra
*
* 5/00: Support for the RSA-DV II/S card added.
* Kiyokazu SUTO
*
* 6/00: Remove old-style timer, use timer_list
* Andrew Morton
*
* 7/00: Support Timedia/Sunix/Exsys PCI cards
*
* 7/00: fix some returns on failure not using MOD_DEC_USE_COUNT.
* Arnaldo Carvalho de Melo
*
* 10/00: add in optional software flow control for serial console.
* Kanoj Sarcar (Modified by Theodore Ts'o)
*
* 09/02: modify by wesley king for s3c44b0's serial console.
* Qin Wei
*
* 01/03: modify by wesley king for s3c44b0's serial console, support ev44b0ii.
* Qin Wei
*
*/
static char *serial_version = "1.10";
static char *serial_revdate = "2003-01-15";
/*
* Serial driver configuration section. Here are the various options:
*
* CONFIG_HUB6
* Enables support for the venerable Bell Technologies
* HUB6 card.
*
* CONFIG_SERIAL_MANY_PORTS
* Enables support for ports beyond the standard, stupid
* COM 1/2/3/4.
*
* CONFIG_SERIAL_MULTIPORT
* Enables support for special multiport board support.
*
* CONFIG_SERIAL_SHARE_IRQ
* Enables support for multiple serial ports on one IRQ
*
* CONFIG_SERIAL_DETECT_IRQ
* Enable the autodetection of IRQ on standart ports
*
* SERIAL_PARANOIA_CHECK
* Check the magic number for the async_structure where
* ever possible.
*/
#include
#include
#undef SERIAL_PARANOIA_CHECK
#define CONFIG_SERIAL_NOPAUSE_IO
#define SERIAL_DO_RESTART
/* Set of debugging defines */
#undef SERIAL_DEBUG_INTR
#undef SERIAL_DEBUG_OPEN
#undef SERIAL_DEBUG_FLOW
#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
#undef SERIAL_DEBUG_PCI
#undef SERIAL_DEBUG_AUTOCONF
/* Sanity checks */
// Qinwei : for using polling mode to send char on serial port
//#define UARTPOLLING
#undef UARTPOLLING
#ifdef UARTPOLLING
#define RS_STROBE_TIME 10*HZ
#else
#define RS_STROBE_TIME 10
#endif
#define RS_ISR_PASS_LIMIT 256
#if defined(__i386__) && (defined(CONFIG_M386) || defined(CONFIG_M486))
#define SERIAL_INLINE
#endif
/*
* End of serial driver configuration section.
*/
#include
#include
#include
#include
#ifdef LOCAL_HEADERS
#include "serial_local.h"
#else
#include
#include
//#include
#include
#define LOCAL_VERSTRING ""
#endif
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#if (LINUX_VERSION_CODE >= 131343)
#include
#endif
#if (LINUX_VERSION_CODE >= 131336)
#include
#endif
#include
#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
#include
#endif
#ifdef CONFIG_MAGIC_SYSRQ
#include
#endif
#ifdef CONFIG_LEDMAN
#include
#endif
/*
* All of the compatibilty code so we can compile serial.c against
* older kernels is hidden in serial_compat.h
*/
#if defined(LOCAL_HEADERS) || (LINUX_VERSION_CODE < 0x020317) /* 2.3.23 */
#include "serial_compat.h"
#endif
#include
#include
#include
#include
#ifdef CONFIG_MAC_SERIAL
#define SERIAL_DEV_OFFSET 2
#else
#define SERIAL_DEV_OFFSET 0
#endif
#ifdef SERIAL_INLINE
#define _INLINE_ inline
#else
#define _INLINE_
#endif
#define RdURXH2() (*(volatile unsigned char *)ADDR_SERIAL_A)
#define RdURXH3() (*(volatile unsigned char *)ADDR_SERIAL_B)
#define WrUTXH2(ch) (*(volatile unsigned char *)ADDR_SERIAL_A)=(unsigned char)(ch)
#define WrUTXH3(ch) (*(volatile unsigned char *)ADDR_SERIAL_B)=(unsigned char)(ch)
#define rEXTINTPND (0x01D20054)
#define EX_UART_GCR_RX_INT 0x01
#define EX_UART_GCR_TX_INT 0x04
#define EX_UART_LCR 3
#define EX_UART_LSR 5
#define EX_UART_BDR 0
#define EX_UART_GCR 1
#define EX_UART_TX 0
#define EX_UART_RX 0
static char *serial_name = "EV44B0II Serial driver";
extern unsigned int dwCpuClk;
extern unsigned int dwTestBaud;
static DECLARE_TASK_QUEUE(tq_serial);
static struct tty_driver serial_driver, callout_driver;
static int serial_refcount;
static struct timer_list serial_timer;
_INLINE_ void disable_uart_tx_interrupt(int line);
_INLINE_ void disable_uart_rx_interrupt(int line);
_INLINE_ void enable_uart_tx_interrupt(int line);
_INLINE_ void enable_uart_rx_interrupt(int line);
static _INLINE_ void wait_for_xmitr(struct async_struct *info);
static _INLINE_ void transmit_chars(struct async_struct *info, int *intr_done);
/* serial subtype definitions */
#ifndef SERIAL_TYPE_NORMAL
#define SERIAL_TYPE_NORMAL 1
#define SERIAL_TYPE_CALLOUT 2
#endif
/* number of characters left in xmit buffer before we ask for more */
#define WAKEUP_CHARS 256
/*
* IRQ_timeout - How long the timeout should be for each IRQ
* should be after the IRQ has been active.
*/
static struct async_struct *IRQ_ports[NR_IRQS];
static int IRQ_timeout[NR_IRQS];
#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
static struct console sercons;
static int lsr_break_flag;
#endif
#if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
static unsigned long break_pressed; /* break, really ... */
#endif
static unsigned detect_uart_irq (struct serial_state * state);
static void autoconfig(struct serial_state * state);
static void change_speed(struct async_struct *info, struct termios *old);
static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
/*
* Here we define the default xmit fifo size used for each type of
* UART
*/
static struct serial_uart_config uart_config[] = {
{ "unknown", 1, 0 },
{ "8250", 1, 0 },
{ "16450", 1, 0 },
{ "16550", 1, 0 },
{ "16550A", 16, UART_CLEAR_FIFO | UART_USE_FIFO },
{ "cirrus", 1, 0 }, // usurped by cyclades.c
{ "ST16650", 1, UART_CLEAR_FIFO | UART_STARTECH },
{ "ST16650V2", 32, UART_CLEAR_FIFO | UART_USE_FIFO |
UART_STARTECH },
{ "TI16750", 64, UART_CLEAR_FIFO | UART_USE_FIFO},
{ "Startech", 1, 0}, // usurped by cyclades.c
{ "16C950/954", 128, UART_CLEAR_FIFO | UART_USE_FIFO},
{ "ST16654", 64, UART_CLEAR_FIFO | UART_USE_FIFO |
UART_STARTECH },
{ "XR16850", 128, UART_CLEAR_FIFO | UART_USE_FIFO |
UART_STARTECH },
{ "RSA", 2048, UART_CLEAR_FIFO | UART_USE_FIFO },
{ "S3C44B0", 1, 0}, /* Samsung S3C44B0 uart support */
{ 0, 0}
};
static struct serial_state rs_table[RS_TABLE_SIZE] = {
SERIAL_PORT_DFNS // Defined in serial.h
};
#define NR_PORTS (sizeof(rs_table)/sizeof(struct serial_state))
#ifndef PREPARE_FUNC
#define PREPARE_FUNC(dev) (dev->prepare)
#define ACTIVATE_FUNC(dev) (dev->activate)
#define DEACTIVATE_FUNC(dev) (dev->deactivate)
#endif
#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
static struct tty_struct *serial_table[NR_PORTS];
static struct termios *serial_termios[NR_PORTS];
static struct termios *serial_termios_locked[NR_PORTS];
#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
kdevname(tty->device), (info->flags), serial_refcount,info->count,tty->count,s)
#else
#define DBG_CNT(s)
#endif
/*
* tmp_buf is used as a temporary buffer by serial_write. We need to
* lock it in case the copy_from_user blocks while swapping in a page,
* and some other program tries to do a serial write at the same time.
* Since the lock will only come under contention when the system is
* swapping and available memory is low, it makes sense to share one
* buffer across all the serial ports, since it significantly saves
* memory if large numbers of serial ports are open.
*/
static unsigned char *tmp_buf;
#ifdef DECLARE_MUTEX
static DECLARE_MUTEX(tmp_buf_sem);
#else
static struct semaphore tmp_buf_sem = MUTEX;
#endif
static _INLINE_ int serial_paranoia_check(struct async_struct *info,
kdev_t device, const char *routine)
{
#ifdef SERIAL_PARANOIA_CHECK
static const char *badmagic =
"Warning: bad magic number for serial struct (%s) in %s\n";
static const char *badinfo =
"Warning: null async_struct for (%s) in %s\n";
if (!info) {
printk(badinfo, kdevname(device), routine);
return 1;
}
if (info->magic != SERIAL_MAGIC) {
printk(badmagic, kdevname(device), routine);
return 1;
}
#endif
return 0;
}
static _INLINE_ unsigned int serial_in(struct async_struct *info, int offset)
{
// return CSR_READ(info->port + offset);
if(info->line==0||info->line==1)
{
return CSR_READ(info->port + offset);
}
/*else */
/*{ */
/*return (CSR_READ(GetOutAddr(GetInterAddr(info->port)+offset)));*/
/*} */
}
static _INLINE_ void serial_out(struct async_struct *info, int offset,
int value)
{
if(info->line==0||info->line==1)
{
CSR_WRITE(info->port+offset, value);
}
/*else */
/*{ */
/*CSR_WRITE(GetOutAddr(GetInterAddr(info->port)+offset),value);*/
/*} */
}
static _INLINE_ unsigned int uart_in(struct async_struct *info, int offset)
{
switch(info->line)
{
case 0:
return RdURXH0();
case 1:
return RdURXH1();
case 2:
return RdURXH2();
default:
return RdURXH3();
}
}
static _INLINE_ void uart_out(struct async_struct *info, int offset,
int value)
{
switch(info->line)
{
case 0:
WrUTXH0(value);
break;
case 1:
WrUTXH1(value);
break;
default:
break;
/*case 2: */
/*WrUTXH2(value);*/
/*break; */
/*default: */
/*WrUTXH3(value);*/
}
}
/*
* We used to support using pause I/O for certain machines. We
* haven't supported this for a while, but just in case it's badly
* needed for certain old 386 machines, I've left these #define's
* in....
*/
#define serial_inp(info, offset) serial_in(info, offset)
#define serial_outp(info, offset, value) serial_out(info, offset, value)
unsigned int baudrate_div(unsigned int baudrate)
{
dwTestBaud=((unsigned int)((float)dwCpuClk/16/baudrate + 0.5)) -1 ;
return dwTestBaud;
}
/*
* ------------------------------------------------------------
* rs_stop() and rs_start()
*
* This routines are called before setting or resetting tty->stopped.
* They enable or disable transmitter interrupts, as necessary.
* ------------------------------------------------------------
*/
static void rs_stop(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_stop"))
return;
save_flags(flags); cli();
disable_uart_tx_interrupt(info->line);
restore_flags(flags);
}
_INLINE_ void disable_uart_tx_interrupt(int line)
{
unsigned int tmp;
unsigned int addr;
switch(line)
{
case 0:
INT_DISABLE(INT_UTXD0);
CLEAR_PEND_INT(INT_UTXD0);
break;
case 1:
INT_DISABLE(INT_UTXD1);
CLEAR_PEND_INT(INT_UTXD1);
break;
/*case 2: */
/*addr=GetOutAddr(GetInterAddr(ADDR_SERIAL_A)+1);*/
/*tmp=CSR_READ(addr); */
/*tmp&=~0x02; */
/*CSR_WRITE(addr,tmp); */
/*break; */
/*case 3: */
/*addr=GetOutAddr(GetInterAddr(ADDR_SERIAL_B)+1);*/
/*tmp=CSR_READ(addr); */
/*tmp&=~0x02; */
/*CSR_WRITE(addr,tmp); */
/*break; */
default:
break;
}
}
_INLINE_ void disable_uart_rx_interrupt(int line)
{
unsigned int tmp;
unsigned int addr;
switch(line)
{
case 0:
INT_DISABLE(INT_URXD0);
CLEAR_PEND_INT(INT_URXD0);
break;
case 1:
INT_DISABLE(INT_URXD1);
CLEAR_PEND_INT(INT_URXD1);
break;
/*case 2: */
/*addr=GetOutAddr(GetInterAddr(ADDR_SERIAL_A)+1);*/
/*tmp=CSR_READ(addr); */
/*tmp&=~0x01; */
/*CSR_WRITE(addr,tmp); */
/*break; */
/*case 3: */
/*addr=GetOutAddr(GetInterAddr(ADDR_SERIAL_B)+1);*/
/*tmp=CSR_READ(addr); */
/*tmp&=~0x01; */
/*CSR_WRITE(addr,tmp); */
/*break; */
default:
break;
}
}
_INLINE_ void enable_uart_tx_interrupt(int line)
{
unsigned int tmp;
unsigned int addr;
switch(line)
{
case 0:
INT_ENABLE(INT_UTXD0);
break;
case 1:
INT_ENABLE(INT_UTXD1);
break;
/*case 2: */
/*addr=GetOutAddr(GetInterAddr(ADDR_SERIAL_A)+1);*/
/*tmp=CSR_READ(addr); */
/*tmp|=0x02; */
/*CSR_WRITE(addr,tmp); */
/*break; */
/*case 3: */
/*addr=GetOutAddr(GetInterAddr(ADDR_SERIAL_B)+1);*/
/*tmp=CSR_READ(addr); */
/*tmp|=0x02; */
/*CSR_WRITE(addr,tmp); */
/*break; */
default:
break;
}
}
_INLINE_ void enable_uart_rx_interrupt(int line)
{
unsigned int tmp;
unsigned int addr;
switch(line)
{
case 0:
INT_ENABLE(INT_URXD0);
break;
case 1:
INT_ENABLE(INT_URXD1);
break;
/*case 2: */
/*addr=GetOutAddr(GetInterAddr(ADDR_SERIAL_A)+1);*/
/*tmp=CSR_READ(addr); */
/*tmp|=0x01; */
/*CSR_WRITE(addr,tmp); */
/*break; */
/*case 3: */
/*addr=GetOutAddr(GetInterAddr(ADDR_SERIAL_B)+1);*/
/*tmp=CSR_READ(addr); */
/*tmp|=0x01; */
/*CSR_WRITE(addr,tmp); */
/*break; */
default:
break;
}
}
static void rs_start(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_start"))
return;
save_flags(flags); cli();
if (info->xmit.head != info->xmit.tail
&& info->xmit.buf) {
enable_uart_tx_interrupt(info->line);
}
restore_flags(flags);
}
/*
* ----------------------------------------------------------------------
*
* Here starts the interrupt handling routines. All of the following
* subroutines are declared as inline and are folded into
* rs_interrupt(). They were separated out for readability's sake.
*
* Note: rs_interrupt() is a "fast" interrupt, which means that it
* runs with interrupts turned off. People who may want to modify
* rs_interrupt() should try to keep the interrupt handler as fast as
* possible. After you are done making modifications, it is not a bad
* idea to do:
*
* gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
*
* and look at the resulting assemble code in serial.s.
*
* - Ted Ts'o (tytso@mit.edu), 7-Mar-93
* -----------------------------------------------------------------------
*/
/*
* This routine is used by the interrupt handler to schedule
* processing in the software interrupt portion of the driver.
*/
static _INLINE_ void rs_sched_event(struct async_struct *info,
int event)
{
info->event |= 1 << event;
queue_task(&info->tqueue, &tq_serial);
mark_bh(SERIAL_BH);
}
static _INLINE_ void receive_chars(struct async_struct *info,
int *status, struct pt_regs * regs)
{
struct tty_struct *tty = info->tty;
unsigned char ch;
struct async_icount *icount;
int max_count = 256;
#ifdef CONFIG_LEDMAN
ledman_cmd(LEDMAN_CMD_SET,
(info->line == 0) ? LEDMAN_COM1_RX : LEDMAN_COM2_RX);
#endif
icount = &info->state->icount;
do {
if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
tty->flip.tqueue.routine((void *) tty);
if (tty->flip.count >= TTY_FLIPBUF_SIZE)
return; // if TTY_DONT_FLIP is set
}
if(info->line==0||info->line==1)
ch = uart_in(info, UART_RX);
/* */
/*else */
/* ch = uart_in(info, EX_UART_RX);*/
*tty->flip.char_buf_ptr = ch;
icount->rx++;
#ifdef SERIAL_DEBUG_INTR
printk("DR%02x:%02x...", ch, *status);
#endif
*tty->flip.flag_buf_ptr = 0;
/*
if (*status & (UART_LSR_BI | UART_LSR_PE |
UART_LSR_FE | UART_LSR_OE)) {
//
// For statistics only
//
if (*status & UART_LSR_BI) {
*status &= ~(UART_LSR_FE | UART_LSR_PE);
icount->brk++;
//
// We do the SysRQ and SAK checking
// here because otherwise the break
// may get masked by ignore_status_mask
// or read_status_mask.
//
#if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
if (info->line == sercons.index) {
if (!break_pressed) {
break_pressed = jiffies;
goto ignore_char;
}
break_pressed = 0;
}
#endif
if (info->flags & ASYNC_SAK)
do_SAK(tty);
} else if (*status & UART_LSR_PE)
icount->parity++;
else if (*status & UART_LSR_FE)
icount->frame++;
if (*status & UART_LSR_OE)
icount->overrun++;
*/
//
// Mask off conditions which should be ignored.
//
*status &= info->read_status_mask;
#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
if (info->line == sercons.index) {
// Recover the break flag from console xmit
*status |= lsr_break_flag;
lsr_break_flag = 0;
}
#endif
/* if (*status & (UART_LSR_BI)) {
#ifdef SERIAL_DEBUG_INTR
printk("handling break....");
#endif
*tty->flip.flag_buf_ptr = TTY_BREAK;
} else if (*status & UART_LSR_PE)
*tty->flip.flag_buf_ptr = TTY_PARITY;
else if (*status & UART_LSR_FE)
*tty->flip.flag_buf_ptr = TTY_FRAME;
}*/
#if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
if (break_pressed && info->line == sercons.index) {
if (ch != 0 &&
time_before(jiffies, break_pressed + HZ*5)) {
handle_sysrq(ch, regs, NULL, NULL);
break_pressed = 0;
goto ignore_char;
}
break_pressed = 0;
}
#endif
if ((*status & info->ignore_status_mask) == 0) {
tty->flip.flag_buf_ptr++;
tty->flip.char_buf_ptr++;
tty->flip.count++;
}
/* if ((*status & UART_LSR_OE) &&
(tty->flip.count < TTY_FLIPBUF_SIZE)) {
//
// Overrun is special, since it's reported
// immediately, and doesn't affect the current
// character
//
*tty->flip.flag_buf_ptr = TTY_OVERRUN;
tty->flip.count++;
tty->flip.flag_buf_ptr++;
tty->flip.char_buf_ptr++;
}*/
#if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
ignore_char:
#endif
if(info->line==0||info->line==1)
*status = serial_inp(info, UART_LSR);
else
*status = serial_inp(info, EX_UART_LSR);
} while ((*status & UART_LSR_DR) && (max_count-- > 0));
#if (LINUX_VERSION_CODE > 131394) // 2.1.66
tty_flip_buffer_push(tty);
#else
queue_task_irq_off(&tty->flip.tqueue, &tq_timer);
#endif
}
static _INLINE_ void transmit_chars(struct async_struct *info, int *intr_done)
{
int count;
unsigned int status;
#ifdef CONFIG_LEDMAN
ledman_cmd(LEDMAN_CMD_SET,
(info->line == 0) ? LEDMAN_COM1_TX : LEDMAN_COM2_TX);
#endif
/*if(info->line==2) */
/*printk("串口2发送\n"); */
/*else */
/*if(info->line==3) */
/*printk("串口3发送\n");*/
if (info->x_char) {
if(info->line==0||info->line==1)
uart_out(info, UART_TX, info->x_char);
/*else */
/*uart_out(info, EX_UART_TX, info->x_char);*/
info->state->icount.tx++;
info->x_char = 0;
if (intr_done)
*intr_done = 0;
return;
}
if (info->xmit.head == info->xmit.tail
|| info->tty->stopped
|| info->tty->hw_stopped) {
disable_uart_tx_interrupt(info->line);
return;
}
count = info->xmit_fifo_size;
do {
if(info->line==0||info->line==1)
uart_out(info, UART_TX, info->xmit.buf[info->xmit.tail]);
/*else */
/*uart_out(info, EX_UART_TX, info->xmit.buf[info->xmit.tail]);*/
info->xmit.tail = (info->xmit.tail + 1) & (SERIAL_XMIT_SIZE-1);
info->state->icount.tx++;
if (info->xmit.head == info->xmit.tail)
break;
wait_for_xmitr(info);
status&=(~(UART_LSR_TEMT | UART_LSR_THRE));
if(info->line==0||info->line==1)
serial_out(info,UART_LSR,status);
/*else */
/*serial_out(info,EX_UART_LSR,status);*/
} while (--count > 0);
if (CIRC_CNT(info->xmit.head,
info->xmit.tail,
SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
#ifdef SERIAL_DEBUG_INTR
printk("THRE...");
#endif
if (intr_done)
*intr_done = 0;
if (info->xmit.head == info->xmit.tail) {
disable_uart_tx_interrupt(info->line);
}
}
/*
* This is the serial driver's interrupt routine for a single port
*/
static void rs_interrupt_single(int irq, void *dev_id, struct pt_regs * regs)
{
int status;
int pass_counter = 0;
struct async_struct * info;
info = IRQ_ports[irq];
if (!info || !info->tty)
return;
if ((irq == INT_URXD1) || (irq == INT_URXD0)){ // Qinwei 2002.09.16 if (status & UART_LSR_THRE)
do {
if(info->line==0||info->line==1)
status = serial_inp(info, UART_LSR);
else
status = serial_inp(info, EX_UART_LSR);
if (status & UART_LSR_DR)
receive_chars(info, &status, regs);
if (pass_counter++ > RS_ISR_PASS_LIMIT) {
break;
}
} while (status & UART_LSR_DR );
info->last_active = jiffies;
return;
}
if ((irq == INT_UTXD1) || (irq == INT_UTXD0)){ // Qinwei 2002.09.16 if (status & UART_LSR_THRE)
transmit_chars(info, 0);
info->last_active = jiffies;
return;
}
}
/******************************************************************************
* 功能： 83977串行中断程序
******************************************************************************/
/*inline void do_com_interrupt(struct async_struct * info,int * status,struct pt_regs * regs)*/
/*{ */
/* unsigned char bInterruptNo; */
/* //bInterruptNo=0x07&inb(GetOutAddr(wInterAddr+2)); */
/* bInterruptNo=0x07&serial_in(info,2); */
/* switch(bInterruptNo) */
/* { */
/* case 0: */
/* //modem_status */
/* serial_in(info,6); */
/* break; */
/* case 2: */
/* //write_char */
/* transmit_chars(info, 0); */
/* break; */
/* case 4: */
/* //read_char */
/* receive_chars(info, status, regs); */
/* break; */
/* case 6: */
/* //line_status */
/* serial_in(info,5); */
/* break; */
/* default: */
/* break; */
/* } */
/*} */
/*
static void rs_83977_interrupt(int irq, void *dev_id, struct pt_regs * regs)
{
unsigned int tmp;
int status;
struct async_struct * info;
info = IRQ_ports[irq];
if (!info || !info->tty)
return;
tmp=CSR_READ(rEXTINTPND);
if(tmp&0x01)
{
//串口3中断
printk("串口3中断\n");
do_com_interrupt(info,&status,regs);
CSR_WRITE(rEXTINTPND,tmp&(~0x01));
}
if(tmp&0x02)
{
//串口4中断
printk("串口4中断\n");
do_com_interrupt(info,&status,regs);
CSR_WRITE(rEXTINTPND,tmp&(~0x02));
}
}
*/
/*
* -------------------------------------------------------------------
* Here ends the serial interrupt routines.
* -------------------------------------------------------------------
*/
/*
* This routine is used to handle the "bottom half" processing for the
* serial driver, known also the "software interrupt" processing.
* This processing is done at the kernel interrupt level, after the
* rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
* is where time-consuming activities which can not be done in the
* interrupt driver proper are done; the interrupt driver schedules
* them using rs_sched_event(), and they get done here.
*/
static void do_serial_bh(void)
{
run_task_queue(&tq_serial);
}
static void do_softint(void *private_)
{
struct async_struct *info = (struct async_struct *) private_;
struct tty_struct *tty;
tty = info->tty;
if (!tty)
return;
if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
tty->ldisc.write_wakeup)
(tty->ldisc.write_wakeup)(tty);
wake_up_interruptible(&tty->write_wait);
#ifdef SERIAL_HAVE_POLL_WAIT
wake_up_interruptible(&tty->poll_wait);
#endif
}
}
/*
* This subroutine is called when the RS_TIMER goes off. It is used
* by the serial driver to handle ports that do not have an interrupt
* (irq=0). This doesn't work very well for 16450's, but gives barely
* passable results for a 16550A. (Although at the expense of much
* CPU overhead).
*/
static void rs_timer(unsigned long dummy)
{
#ifndef UARTPOLLING
static unsigned long last_strobe;
struct async_struct *info;
unsigned int i;
unsigned long flags;
if ((jiffies - last_strobe) >= RS_STROBE_TIME) {
for (i=0; i < NR_IRQS; i++) {
info = IRQ_ports[i];
if (!info)
continue;
save_flags(flags); cli();
rs_interrupt_single(i, NULL, NULL);
restore_flags(flags);
}
}
last_strobe = jiffies;
mod_timer(&serial_timer, jiffies + RS_STROBE_TIME);
if (IRQ_ports[0]) {
save_flags(flags); cli();
rs_interrupt_single(0, NULL, NULL);
restore_flags(flags);
mod_timer(&serial_timer, jiffies + IRQ_timeout[0]);
}
#endif
}
/*
* ---------------------------------------------------------------
* Low level utility subroutines for the serial driver: routines to
* figure out the appropriate timeout for an interrupt chain, routines
* to initialize and startup a serial port, and routines to shutdown a
* serial port. Useful stuff like that.
* ---------------------------------------------------------------
*/
/*
* This routine figures out the correct timeout for a particular IRQ.
* It uses the smallest timeout of all of the serial ports in a
* particular interrupt chain. Now only used for IRQ 0....
*/
static void figure_IRQ_timeout(int irq)
{
struct async_struct *info;
int timeout = 60*HZ; // 60 seconds === a long time :-)
info = IRQ_ports[irq];
if (!info) {
IRQ_timeout[irq] = 60*HZ;
return;
}
while (info) {
if (info->timeout < timeout)
timeout = info->timeout;
info = info->next_port;
}
if (!irq)
timeout = timeout / 2;
IRQ_timeout[irq] = (timeout > 3) ? timeout-2 : 1;
}
static int startup(struct async_struct * info)
{
unsigned long flags;
int retval=0;
void (*handler)(int, void *, struct pt_regs *);
struct serial_state *state= info->state;
unsigned long page;
page = get_zeroed_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
save_flags(flags); cli();
if (info->flags & ASYNC_INITIALIZED) {
free_page(page);
goto errout;
}
if (!CONFIGURED_SERIAL_PORT(state) || !state->type) {
if (info->tty)
set_bit(TTY_IO_ERROR, &info->tty->flags);
free_page(page);
goto errout;
}
if (info->xmit.buf)
free_page(page);
else
info->xmit.buf = (unsigned char *) page;
#ifdef SERIAL_DEBUG_OPEN
printk("starting up ttys%d (irq %d)...", info->line, state->irq);
#endif
switch(info->line)
{
case 0:
case 1:
CLEAR_PEND_INT(state->irq); /* clear serial UART rx interrupt */
CLEAR_PEND_INT(state->irq-4); /* clear serial UART tx interrupt */
break;
/**/
/*case 2: */
/*case 3: */
/*disable_uart_tx_interrupt(info->line);*/
/*enable_uart_tx_interrupt(info->line); */
/*disable_uart_rx_interrupt(info->line);*/
/*enable_uart_rx_interrupt(info->line); */
/*break; */
default:
break;
}
//
// Allocate the IRQ if necessary
//
if (state->irq && (!IRQ_ports[state->irq] ||
!IRQ_ports[state->irq]->next_port)) {
if (IRQ_ports[state->irq]) {
retval = -EBUSY;
goto errout;
} else
{
if(info->line==0||info->line==1)
{
handler = rs_interrupt_single;
// Mac Wang register rx and tx seperatly
retval = request_irq(state->irq, handler, SA_SHIRQ,
"serial Rx", &IRQ_ports[state->irq]);
retval = request_irq(state->irq - 4, handler, SA_SHIRQ,
"serial Tx", &IRQ_ports[state->irq-4]);
}
/*
else
{
handler = rs_83977_interrupt;
printk("rs_83977_interrupt:%d\n",state->irq);
retval = request_irq(state->irq, handler, SA_SHIRQ,
"83977 serial Tx && Rx", &IRQ_ports[state->irq]);
}
*/
}
if (retval) {
if (capable(CAP_SYS_ADMIN)) {
if (info->tty)
set_bit(TTY_IO_ERROR,
&info->tty->flags);
retval = 0;
}
goto errout;
}
}
//
// Insert serial port into IRQ chain.
//
info->prev_port = 0;
info->next_port = IRQ_ports[state->irq];
if (info->next_port)
info->next_port->prev_port = info;
if(info->line==0||info->line==1)
{
IRQ_ports[state->irq] = info;
figure_IRQ_timeout(state->irq);
IRQ_ports[state->irq - 4] = info;
figure_IRQ_timeout(state->irq - 4);
}
/*
else
{
IRQ_ports[state->irq] = info;
figure_IRQ_timeout(state->irq);
}
*/
//
// Now, initialize the UART
//
/*
serial_outp(info, UART_LCR, UART_LCR_WLEN8); // reset DLAB
info->MCR = 0;
if (info->tty->termios->c_cflag & CBAUD)
info->MCR = UART_MCR_DTR | UART_MCR_RTS;
{
if (state->irq != 0)
info->MCR |= UART_MCR_OUT2;
}
info->MCR |= ALPHA_KLUDGE_MCR; // Don't ask
serial_outp(info, UART_MCR, info->MCR);
*/
#ifdef CONFIG_SERIAL_SAMSUNG_IRDA
if (info->line == 1){
serial_outp(info, UART_LCR, UART_LCR_WLEN8|UART_LCR_IRDA);
}
else
serial_outp(info, UART_LCR, UART_LCR_WLEN8); // UART0 don't support IRDA mode
#else
if(info->line==0||info->line==1)
serial_outp(info, UART_LCR, UART_LCR_WLEN8);
/*else */
/* serial_outp(info, EX_UART_LCR, UART_LCR_WLEN8);*/
#endif
/* Enable the I/O pins*/
if (info->line == 1)
{
CSR_WRITE(rPCONC,((3 << 20)|(3 << 22)|(3 << 24)| (3 << 26) | (3<<28)|(3 <<30))); // Enable UART1's Pin
CSR_WRITE(rPUPC,CSR_READ(rPUPC)|0xfc00); // set pull up
#ifdef CONFIG_SERIAL_SAMSUNG_IRDA
CSR_WRITE(rPCONE,CSR_READ(rPCONE)|1); // Enable UART0's Pin
CSR_WRITE(rPDATE,CSR_READ(rPDATE)&0xFE); // select enable IRDA
#endif
}
else
{
if(info->line==0)
{
CSR_WRITE(rPCONE,CSR_READ(rPCONE)|(2 << 2) | (2 << 4)); // Enable UART0's Pin
}
}
// serial_outp(info, UART_GCR, UART_GCR_RX_INT|UART_GCR_TX_INT|UART_GCR_RX_STAT_INT);
if(info->line==0||info->line==1)
{
serial_outp(info, UART_GCR, UART_GCR_RX_INT|UART_GCR_TX_INT);
}
/*else */
/*{ */
/*serial_outp(info, EX_UART_GCR, EX_UART_GCR_RX_INT|EX_UART_GCR_TX_INT);*/
/*} */
//
// Finally, enable interrupts
//
/*
info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
serial_outp(info, UART_IER, info->IER); // enable interrupts
*/
enable_uart_rx_interrupt(info->line) ;
//
// And clear the interrupt registers again for luck.
//
CLEAR_PEND_INT(state->irq); /* clear serial UART rx interrupt */
if(info->line==0||info->line==1)
{
CLEAR_PEND_INT(state->irq-4); /* clear serial UART tx interrupt */
}
if (info->tty)
clear_bit(TTY_IO_ERROR, &info->tty->flags);
info->xmit.head = info->xmit.tail = 0;
//
// Set up serial timers...
//
mod_timer(&serial_timer, jiffies + 2*HZ/100);
//
// Set up the tty->alt_speed kludge
//
#if (LINUX_VERSION_CODE >= 131394) // Linux 2.1.66
if (info->tty) {
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
info->tty->alt_speed = 57600;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
info->tty->alt_speed = 115200;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
info->tty->alt_speed = 230400;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
info->tty->alt_speed = 460800;
}
#endif
//
// and set the speed of the serial port
//
change_speed(info, 0);
info->flags |= ASYNC_INITIALIZED;
restore_flags(flags);
return 0;
errout:
restore_flags(flags);
return retval;
}
/*
* This routine will shutdown a serial port; interrupts are disabled, and
* DTR is dropped if the hangup on close termio flag is on.
*/
static void shutdown(struct async_struct * info)
{
unsigned long flags;
struct serial_state *state;
int retval;
if (!(info->flags & ASYNC_INITIALIZED))
return;
state = info->state;
#ifdef SERIAL_DEBUG_OPEN
printk("Shutting down serial port %d (irq %d)....", info->line,
state->irq);
#endif
save_flags(flags); cli(); // Disable interrupts
//
// clear delta_msr_wait queue to avoid mem leaks: we may free the irq
// here so the queue might never be waken up
//
wake_up_interruptible(&info->delta_msr_wait);
//
// First unlink the serial port from the IRQ chain...
//
if (info->next_port)
info->next_port->prev_port = info->prev_port;
if (info->prev_port)
info->prev_port->next_port = info->next_port;
else
IRQ_ports[state->irq] = info->next_port;
figure_IRQ_timeout(state->irq);
//
// Free the IRQ, if necessary
//
// rx
if (state->irq && (!IRQ_ports[state->irq] ||
!IRQ_ports[state->irq]->next_port)) {
if (IRQ_ports[state->irq]) {
free_irq(state->irq, &IRQ_ports[state->irq]);
retval = request_irq(state->irq, rs_interrupt_single,
SA_SHIRQ, "serial",
&IRQ_ports[state->irq]);
if (retval)
printk("serial shutdown: request_irq: error %d"
" Couldn't reacquire IRQ.\n", retval);
} else
free_irq(state->irq, &IRQ_ports[state->irq]);
}
// tx
if (state->irq - 4 && (!IRQ_ports[state->irq - 4] ||
!IRQ_ports[state->irq - 4]->next_port)) {
free_irq(state->irq-4, &IRQ_ports[state->irq-4]);
}
if (info->xmit.buf) {
unsigned long pg = (unsigned long) info->xmit.buf;
info->xmit.buf = 0;
free_page(pg);
}
/*
info->IER = 0;
serial_outp(info, UART_IER, 0x00); // disable all intrs
*/
disable_uart_rx_interrupt(info->line);
disable_uart_tx_interrupt(info->line);
if(info->line==0||info->line==1)
(void)uart_in(info, UART_RX); // read data port to reset things
/*else */
/*(void)uart_in(info, EX_UART_RX); // read data port to reset things*/
if (info->tty)
set_bit(TTY_IO_ERROR, &info->tty->flags);
info->flags &= ~ASYNC_INITIALIZED;
restore_flags(flags);
}
#if (LINUX_VERSION_CODE < 131394) /* Linux 2.1.66 */
static int baud_table[] = {
0, 50, 75, 110, 134, 150, 200, 300,
600, 1200, 1800, 2400, 4800, 9600, 19200,
38400, 57600, 115200, 230400, 460800, 0 };
#endif
/*
* This routine is called to set the UART divisor registers to match
* the specified baud rate for a serial port.
*/
static void change_speed(struct async_struct *info,
struct termios *old_termios)
{
int quot = 0, baud_base, baud;
// unsigned cflag, cval, fcr = 0;
unsigned cflag, cval;
int bits;
unsigned long flags;
if (!info->tty || !info->tty->termios)
return;
cflag = info->tty->termios->c_cflag;
if (!CONFIGURED_SERIAL_PORT(info))
return;
// byte size and parity
switch (cflag & CSIZE) {
case CS5: cval = 0x00; bits = 7; break;
case CS6: cval = 0x01; bits = 8; break;
case CS7: cval = 0x02; bits = 9; break;
case CS8: cval = 0x03; bits = 10; break;
// Never happens, but GCC is too dumb to figure it out
default: cval = 0x00; bits = 7; break;
}
if (cflag & CSTOPB) {
cval |= 0x04;
bits++;
}
if (cflag & PARENB) {
bits++;
}
if (cflag & PARODD)
cval |= UART_LCR_OPAR;
else if (cflag & PARENB)
cval |= UART_LCR_EPAR;
else
cval |= UART_LCR_NPAR;
#ifdef CONFIG_SERIAL_SAMSUNG_IRDA
if (info->line == 1){
cval |= UART_LCR_IRDA;
}
#endif
// Determine divisor based on baud rate
baud = tty_get_baud_rate(info->tty);
if (!baud)
baud = 9600; // B0 transition handled in rs_set_termios
baud_base = info->state->baud_base;
quot = 1; //tricky
// If the quotient is zero refuse the change
if (!quot && old_termios) {
info->tty->termios->c_cflag &= ~CBAUD;
info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
baud = tty_get_baud_rate(info->tty);
if (!baud)
baud = 9600;
}
// As a last resort, if the quotient is zero, default to 9600 bps
if (!quot)
quot = baud_base / 9600;
//
// Work around a bug in the Oxford Semiconductor 952 rev B
// chip which causes it to seriously miscalculate baud rates
// when DLL is 0.
//
info->quot = quot;
info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
info->timeout += HZ/50; // Add .02 seconds of slop
//
// Set up parity check flag
//
#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
if (I_INPCK(info->tty))
info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
info->read_status_mask |= UART_LSR_BI;
//
// Characters to ignore
//
info->ignore_status_mask = 0;
if (I_IGNPAR(info->tty))
info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
if (I_IGNBRK(info->tty)) {
info->ignore_status_mask |= UART_LSR_BI;
//
// If we're ignore parity and break indicators, ignore
// overruns too. (For real raw support).
//
if (I_IGNPAR(info->tty))
info->ignore_status_mask |= UART_LSR_OE;
}
save_flags(flags); cli();
info->LCR = cval; // Save LCR
if(info->line==0||info->line==1)
{
serial_outp(info, UART_BDR, baudrate_div(baud));
serial_outp(info, UART_LCR, cval);
}
/*else */
/*{ */
/*serial_outp(info, EX_UART_LCR, 0x80); //set line ctrol */
/*serial_outp(info, EX_UART_BDR, 115200%baud); */
/*serial_outp(info, EX_UART_BDR+1, 115200/baud); */
/*serial_outp(info, EX_UART_LCR, cval); //re set line ctrol*/
/*} */
restore_flags(flags);
}
static void rs_put_char(struct tty_struct *tty, unsigned char ch)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_put_char"))
return;
if (!tty || !info->xmit.buf)
return;
save_flags(flags); cli();
if (CIRC_SPACE(info->xmit.head,
info->xmit.tail,
SERIAL_XMIT_SIZE) == 0) {
restore_flags(flags);
return;
}
#ifdef UARTPOLLING
wait_for_xmitr(info);
/* Send the character out. */
if(info->line==0||info->line==1)
uart_out(info, UART_TX, ch);
/*else */
/*uart_out(info, EX_UART_TX, ch);*/
#else
info->xmit.buf[info->xmit.head] = ch;
info->xmit.head = (info->xmit.head + 1) & (SERIAL_XMIT_SIZE-1);
#endif
restore_flags(flags);
}
static void rs_flush_chars(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_flush_chars"))
return;
if (info->xmit.head == info->xmit.tail
|| tty->stopped
|| tty->hw_stopped
|| !info->xmit.buf)
return;
save_flags(flags); cli();
enable_uart_tx_interrupt(info->line);
restore_flags(flags);
}
static int rs_write(struct tty_struct * tty, int from_user,
const unsigned char *buf, int count)
{
int c, ret = 0;
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_write"))
return 0;
if (!tty || !info->xmit.buf || !tmp_buf)
return 0;
save_flags(flags);
if (from_user) {
down(&tmp_buf_sem);
while (1) {
int c1;
c = CIRC_SPACE_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
if (count < c)
c = count;
if (c <= 0)
break;
c -= copy_from_user(tmp_buf, buf, c);
if (!c) {
if (!ret)
ret = -EFAULT;
break;
}
cli();
c1 = CIRC_SPACE_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
if (c1 < c)
c = c1;
memcpy(info->xmit.buf + info->xmit.head, tmp_buf, c);
info->xmit.head = ((info->xmit.head + c) & (SERIAL_XMIT_SIZE-1));
restore_flags(flags);
buf += c;
count -= c;
ret += c;
}
up(&tmp_buf_sem);
} else {
cli();
while (1) {
c = CIRC_SPACE_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
if (count < c)
c = count;
if (c <= 0) {
break;
}
memcpy(info->xmit.buf + info->xmit.head, buf, c);
info->xmit.head = ((info->xmit.head + c) & (SERIAL_XMIT_SIZE-1));
buf += c;
count -= c;
ret += c;
}
restore_flags(flags);
}
if (info->xmit.head != info->xmit.tail && !tty->stopped && !tty->hw_stopped)
{
#ifdef UARTPOLLING
cli();
count = ret;
do {
wait_for_xmitr(info);
/* Send the character out. */
if(info->line==0||info->line==1)
uart_out(info, UART_TX, info->xmit.buf[info->xmit.tail]);
/*else */
/*uart_out(info, EX_UART_TX, info->xmit.buf[info->xmit.tail]);*/
info->xmit.tail = (info->xmit.tail + 1) & (SERIAL_XMIT_SIZE-1);
info->state->icount.tx++;
if (info->xmit.head == info->xmit.tail)
break;
} while (--count > 0);
restore_flags(flags);
#else
enable_uart_tx_interrupt(info->line);
#endif
}
return ret;
}
static int rs_write_room(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
if (serial_paranoia_check(info, tty->device, "rs_write_room"))
return 0;
return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
}
static int rs_chars_in_buffer(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer"))
return 0;
return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
}
static void rs_flush_buffer(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_flush_buffer"))
return;
save_flags(flags); cli();
info->xmit.head = info->xmit.tail = 0;
restore_flags(flags);
wake_up_interruptible(&tty->write_wait);
#ifdef SERIAL_HAVE_POLL_WAIT
wake_up_interruptible(&tty->poll_wait);
#endif
if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
tty->ldisc.write_wakeup)
(tty->ldisc.write_wakeup)(tty);
}
/*
* This function is used to send a high-priority XON/XOFF character to
* the device
*/
static void rs_send_xchar(struct tty_struct *tty, char ch)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
if (serial_paranoia_check(info, tty->device, "rs_send_char"))
return;
info->x_char = ch;
if (ch) {
// Make sure transmit interrupts are on
enable_uart_tx_interrupt(info->line);
}
}
/*
* ------------------------------------------------------------
* rs_throttle()
*
* This routine is called by the upper-layer tty layer to signal that
* incoming characters should be throttled.
* ------------------------------------------------------------
*/
static void rs_throttle(struct tty_struct * tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
#ifdef SERIAL_DEBUG_THROTTLE
char buf[64];
printk("throttle %s: %d....\n", tty_name(tty, buf),
tty->ldisc.chars_in_buffer(tty));
#endif
if (serial_paranoia_check(info, tty->device, "rs_throttle"))
return;
if (I_IXOFF(tty))
rs_send_xchar(tty, STOP_CHAR(tty));
/*
if (tty->termios->c_cflag & CRTSCTS)
info->MCR &= ~UART_MCR_RTS;
*/
save_flags(flags); cli();
restore_flags(flags);
}
static void rs_unthrottle(struct tty_struct * tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
#ifdef SERIAL_DEBUG_THROTTLE
char buf[64];
printk("unthrottle %s: %d....\n", tty_name(tty, buf),
tty->ldisc.chars_in_buffer(tty));
#endif
if (serial_paranoia_check(info, tty->device, "rs_unthrottle"))
return;
if (I_IXOFF(tty)) {
if (info->x_char)
info->x_char = 0;
else
rs_send_xchar(tty, START_CHAR(tty));
}
save_flags(flags); cli();
restore_flags(flags);
}
/*
* ------------------------------------------------------------
* rs_ioctl() and friends
* ------------------------------------------------------------
*/
static int get_serial_info(struct async_struct * info,
struct serial_struct * retinfo)
{
struct serial_struct tmp;
struct serial_state *state = info->state;
if (!retinfo)
return -EFAULT;
memset(&tmp, 0, sizeof(tmp));
tmp.type = state->type;
tmp.line = state->line;
tmp.port = state->port;
if (HIGH_BITS_OFFSET)
tmp.port_high = state->port >> HIGH_BITS_OFFSET;
else
tmp.port_high = 0;
tmp.irq = state->irq;
tmp.flags = state->flags;
tmp.xmit_fifo_size = state->xmit_fifo_size;
tmp.baud_base = state->baud_base;
tmp.close_delay = state->close_delay;
tmp.closing_wait = state->closing_wait;
tmp.custom_divisor = state->custom_divisor;
tmp.hub6 = state->hub6;
tmp.io_type = state->io_type;
if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
return -EFAULT;
return 0;
}
static int set_serial_info(struct async_struct * info,
struct serial_struct * new_info)
{
struct serial_struct new_serial;
struct serial_state old_state, *state;
unsigned int i,change_irq,change_port;
int retval = 0;
unsigned long new_port;
if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
return -EFAULT;
state = info->state;
old_state = *state;
new_port = new_serial.port;
if (HIGH_BITS_OFFSET)
new_port += (unsigned long) new_serial.port_high << HIGH_BITS_OFFSET;
change_irq = new_serial.irq != state->irq;
change_port = (new_port != ((int) state->port)) ||
(new_serial.hub6 != state->hub6);
if (!capable(CAP_SYS_ADMIN)) {
if (change_irq || change_port ||
(new_serial.baud_base != state->baud_base) ||
(new_serial.type != state->type) ||
(new_serial.close_delay != state->close_delay) ||
(new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
((new_serial.flags & ~ASYNC_USR_MASK) !=
(state->flags & ~ASYNC_USR_MASK)))
return -EPERM;
state->flags = ((state->flags & ~ASYNC_USR_MASK) |
(new_serial.flags & ASYNC_USR_MASK));
info->flags = ((info->flags & ~ASYNC_USR_MASK) |
(new_serial.flags & ASYNC_USR_MASK));
state->custom_divisor = new_serial.custom_divisor;
goto check_and_exit;
}
new_serial.irq = irq_cannonicalize(new_serial.irq);
if ((new_serial.irq >= NR_IRQS) || (new_serial.irq < 0) ||
(new_serial.baud_base < 9600)|| (new_serial.type < PORT_UNKNOWN) ||
(new_serial.type > PORT_MAX) || (new_serial.type == PORT_CIRRUS) ||
(new_serial.type == PORT_STARTECH)) {
return -EINVAL;
}
if ((new_serial.type != state->type) ||
(new_serial.xmit_fifo_size <= 0))
new_serial.xmit_fifo_size =
uart_config[new_serial.type].dfl_xmit_fifo_size;
// Make sure address is not already in use
if (new_serial.type) {
for (i = 0 ; i < NR_PORTS; i++)
if ((state != &rs_table[i]) &&
(rs_table[i].port == new_port) &&
rs_table[i].type)
return -EADDRINUSE;
}
if ((change_port || change_irq) && (state->count > 1))
return -EBUSY;
//
// OK, past this point, all the error checking has been done.
// At this point, we start making changes.....
//
state->baud_base = new_serial.baud_base;
state->flags = ((state->flags & ~ASYNC_FLAGS) |
(new_serial.flags & ASYNC_FLAGS));
info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
(info->flags & ASYNC_INTERNAL_FLAGS));
state->custom_divisor = new_serial.custom_divisor;
state->close_delay = new_serial.close_delay * HZ/100;
state->closing_wait = new_serial.closing_wait * HZ/100;
#if (LINUX_VERSION_CODE > 0x20100)
info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
#endif
info->xmit_fifo_size = state->xmit_fifo_size =
new_serial.xmit_fifo_size;
if ((state->type != PORT_UNKNOWN) && state->port) {
release_region(state->port,8);
}
state->type = new_serial.type;
if (change_port || change_irq) {
//
// We need to shutdown the serial port at the old
// port/irq combination.
//
shutdown(info);
state->irq = new_serial.irq;
info->port = state->port = new_port;
info->hub6 = state->hub6 = new_serial.hub6;
if (info->hub6)
info->io_type = state->io_type = SERIAL_IO_HUB6;
else if (info->io_type == SERIAL_IO_HUB6)
info->io_type = state->io_type = SERIAL_IO_PORT;
}
if ((state->type != PORT_UNKNOWN) && state->port) {
request_region(state->port,8,"serial(set)");
}
check_and_exit:
if (!state->port || !state->type)
return 0;
if (info->flags & ASYNC_INITIALIZED) {
if (((old_state.flags & ASYNC_SPD_MASK) !=
(state->flags & ASYNC_SPD_MASK)) ||
(old_state.custom_divisor != state->custom_divisor)) {
#if (LINUX_VERSION_CODE >= 131394) // Linux 2.1.66
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
info->tty->alt_speed = 57600;
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
info->tty->alt_speed = 115200;
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
info->tty->alt_speed = 230400;
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
info->tty->alt_speed = 460800;
#endif
change_speed(info, 0);
}
} else
retval = startup(info);
return retval;
}
/*
* get_lsr_info - get line status register info
*
* Purpose: Let user call ioctl() to get info when the UART physically
* is emptied. On bus types like RS485, the transmitter must
* release the bus after transmitting. This must be done when
* the transmit shift register is empty, not be done when the
* transmit holding register is empty. This functionality
* allows an RS485 driver to be written in user space.
*/
static int get_lsr_info(struct async_struct * info, unsigned int *value)
{
unsigned char status;
unsigned int result;
unsigned long flags;
save_flags(flags); cli();
if(info->line==0||info->line==1)
status = serial_in(info, UART_LSR);
/*else */
/*status = serial_in(info, EX_UART_LSR);*/
restore_flags(flags);
result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
//
// If we're about to load something into the transmit
// register, we'll pretend the transmitter isn't empty to
// avoid a race condition (depending on when the transmit
// interrupt happens).
//
if (info->x_char ||
((CIRC_CNT(info->xmit.head, info->xmit.tail,
SERIAL_XMIT_SIZE) > 0) &&
!info->tty->stopped && !info->tty->hw_stopped))
result &= TIOCSER_TEMT;
if (copy_to_user(value, &result, sizeof(int)))
return -EFAULT;
return 0;
}
static int do_autoconfig(struct async_struct * info)
{
int irq, retval;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (info->state->count > 1)
return -EBUSY;
shutdown(info);
autoconfig(info->state);
if ((info->state->flags & ASYNC_AUTO_IRQ) &&
(info->state->port != 0) &&
(info->state->type != PORT_UNKNOWN)) {
irq = detect_uart_irq(info->state);
if (irq > 0)
info->state->irq = irq;
}
retval = startup(info);
if (retval)
return retval;
return 0;
}
/*
* rs_break() --- routine which turns the break handling on or off
*/
#if (LINUX_VERSION_CODE < 131394) /* Linux 2.1.66 */
#else
static void rs_break(struct tty_struct *tty, int break_state)
{
struct async_struct * info = (struct async_struct *)tty->driver_data;
unsigned long flags, tmp;
if (serial_paranoia_check(info, tty->device, "rs_break"))
return;
if (!CONFIGURED_SERIAL_PORT(info))
return;
save_flags(flags); cli();
/*
if (break_state == -1)
info->LCR |= UART_LCR_SBC;
else
info->LCR &= ~UART_LCR_SBC;
serial_out(info, UART_LCR, info->LCR);
*/
if(info->line==0||info->line==1)
tmp = serial_in(info, UART_GCR);
/*else */
/*tmp = serial_in(info,EX_UART_GCR);*/
if (break_state == -1)
tmp |= UART_LCR_SBC;
else
tmp &= ~UART_LCR_SBC;
if(info->line==0||info->line==1)
serial_out(info, UART_GCR, tmp);
restore_flags(flags);
}
#endif
static int rs_ioctl(struct tty_struct *tty, struct file * file,
unsigned int cmd, unsigned long arg)
{
struct async_struct * info = (struct async_struct *)tty->driver_data;
struct async_icount cprev, cnow; // kernel counter temps
struct serial_icounter_struct icount;
unsigned long flags;
#if (LINUX_VERSION_CODE < 131394) // Linux 2.1.66
int retval, tmp;
#endif
if (serial_paranoia_check(info, tty->device, "rs_ioctl"))
return -ENODEV;
if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
(cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
(cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
if (tty->flags & (1 << TTY_IO_ERROR))
return -EIO;
}
switch (cmd) {
#if (LINUX_VERSION_CODE < 131394) // Linux 2.1.66
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 (signal_pending(current))
return -EINTR;
if (!arg) {
send_break(info, HZ/4); // 1/4 second
if (signal_pending(current))
return -EINTR;
}
return 0;
case TCSBRKP: // support for POSIX tcsendbreak()
retval = tty_check_change(tty);
if (retval)
return retval;
tty_wait_until_sent(tty, 0);
if (signal_pending(current))
return -EINTR;
send_break(info, arg ? arg*(HZ/10) : HZ/4);
if (signal_pending(current))
return -EINTR;
return 0;
case TIOCGSOFTCAR:
tmp = C_CLOCAL(tty) ? 1 : 0;
if (copy_to_user((void *)arg, &tmp, sizeof(int)))
return -EFAULT;
return 0;
case TIOCSSOFTCAR:
if (copy_from_user(&tmp, (void *)arg, sizeof(int)))
return -EFAULT;
tty->termios->c_cflag =
((tty->termios->c_cflag & ~CLOCAL) |
(tmp ? CLOCAL : 0));
return 0;
#endif
case TIOCGSERIAL:
return get_serial_info(info,
(struct serial_struct *) arg);
case TIOCSSERIAL:
return set_serial_info(info,
(struct serial_struct *) arg);
case TIOCSERCONFIG:
return do_autoconfig(info);
case TIOCSERGETLSR: // Get line status register
return get_lsr_info(info, (unsigned int *) arg);
case TIOCSERGSTRUCT:
if (copy_to_user((struct async_struct *) arg,
info, sizeof(struct async_struct)))
return -EFAULT;
return 0;
//
// Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
// - mask passed in arg for lines of interest
// (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
// Caller should use TIOCGICOUNT to see which one it was
//
case TIOCMIWAIT:
save_flags(flags); cli();
// note the counters on entry
cprev = info->state->icount;
restore_flags(flags);
// Force modem status interrupts on
while (1) {
interruptible_sleep_on(&info->delta_msr_wait);
// see if a signal did it
if (signal_pending(current))
return -ERESTARTSYS;
save_flags(flags); cli();
cnow = info->state->icount; // atomic copy
restore_flags(flags);
if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
return -EIO; // no change => error
if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
return 0;
}
cprev = cnow;
}
// NOTREACHED
//
// Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
// Return: write counters to the user passed counter struct
// NB: both 1->0 and 0->1 transitions are counted except for
// RI where only 0->1 is counted.
//
case TIOCGICOUNT:
save_flags(flags); cli();
cnow = info->state->icount;
restore_flags(flags);
icount.cts = cnow.cts;
icount.dsr = cnow.dsr;
icount.rng = cnow.rng;
icount.dcd = cnow.dcd;
icount.rx = cnow.rx;
icount.tx = cnow.tx;
icount.frame = cnow.frame;
icount.overrun = cnow.overrun;
icount.parity = cnow.parity;
icount.brk = cnow.brk;
icount.buf_overrun = cnow.buf_overrun;
if (copy_to_user((void *)arg, &icount, sizeof(icount)))
return -EFAULT;
return 0;
case TIOCSERGWILD:
case TIOCSERSWILD:
// "setserial -W" is called in Debian boot
printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
return 0;
default:
return -ENOIOCTLCMD;
}
return 0;
}
static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
// unsigned long flags;
unsigned int cflag = tty->termios->c_cflag;
if ( (cflag == old_termios->c_cflag)
&& ( RELEVANT_IFLAG(tty->termios->c_iflag)
== RELEVANT_IFLAG(old_termios->c_iflag)))
return;
change_speed(info, old_termios);
// Handle turning off CRTSCTS
if ((old_termios->c_cflag & CRTSCTS) &&
!(tty->termios->c_cflag & CRTSCTS)) {
tty->hw_stopped = 0;
rs_start(tty);
}
}
/*
* ------------------------------------------------------------
* rs_close()
*
* This routine is called when the serial port gets closed. First, we
* wait for the last remaining data to be sent. Then, we unlink its
* async structure from the interrupt chain if necessary, and we free
* that IRQ if nothing is left in the chain.
* ------------------------------------------------------------
*/
static void rs_close(struct tty_struct *tty, struct file * filp)
{
struct async_struct * info = (struct async_struct *)tty->driver_data;
struct serial_state *state;
unsigned long flags;
if (!info || serial_paranoia_check(info, tty->device, "rs_close"))
return;
state = info->state;
save_flags(flags); cli();
if (tty_hung_up_p(filp)) {
DBG_CNT("before DEC-hung");
MOD_DEC_USE_COUNT;
restore_flags(flags);
return;
}
#ifdef SERIAL_DEBUG_OPEN
printk("rs_close ttys%d, count = %d\n", info->line, state->count);
#endif
if ((tty->count == 1) && (state->count != 1)) {
//
// Uh, oh. tty->count is 1, which means that the tty
// structure will be freed. state->count should always
// be one in these conditions. If it's greater than
// one, we've got real problems, since it means the
// serial port won't be shutdown.
//
printk("rs_close: bad serial port count; tty->count is 1, "
"state->count is %d\n", state->count);
state->count = 1;
}
if (--state->count < 0) {
printk("rs_close: bad serial port count for ttys%d: %d\n",
info->line, state->count);
state->count = 0;
}
if (state->count) {
DBG_CNT("before DEC-2");
MOD_DEC_USE_COUNT;
restore_flags(flags);
return;
}
info->flags |= ASYNC_CLOSING;
restore_flags(flags);
//
// Save the termios structure, since this port may have
// separate termios for callout and dialin.
//
if (info->flags & ASYNC_NORMAL_ACTIVE)
info->state->normal_termios = *tty->termios;
if (info->flags & ASYNC_CALLOUT_ACTIVE)
info->state->callout_termios = *tty->termios;
//
// Now we wait for the transmit buffer to clear; and we notify
// the line discipline to only process XON/XOFF characters.
//
tty->closing = 1;
if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
tty_wait_until_sent(tty, info->closing_wait);
//
// At this point we stop accepting input. To do this, we
// disable the receive line status interrupts, and tell the
// interrupt driver to stop checking the data ready bit in the
// line status register.
//
//info->IER &= ~UART_IER_RLSI;
info->read_status_mask &= ~UART_LSR_DR;
if (info->flags & ASYNC_INITIALIZED) {
//serial_out(info, UART_IER, info->IER);
enable_uart_rx_interrupt(info->line);
//
// Before we drop DTR, make sure the UART transmitter
// has completely drained; this is especially
// important if there is a transmit FIFO!
//
rs_wait_until_sent(tty, info->timeout);
}
shutdown(info);
if (tty->driver.flush_buffer)
tty->driver.flush_buffer(tty);
if (tty->ldisc.flush_buffer)
tty->ldisc.flush_buffer(tty);
tty->closing = 0;
info->event = 0;
info->tty = 0;
if (info->blocked_open) {
if (info->close_delay) {
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(info->close_delay);
}
wake_up_interruptible(&info->open_wait);
}
info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
ASYNC_CLOSING);
wake_up_interruptible(&info->close_wait);
MOD_DEC_USE_COUNT;
}
/*
* rs_wait_until_sent() --- wait until the transmitter is empty
*/
static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
{
struct async_struct * info = (struct async_struct *)tty->driver_data;
unsigned long orig_jiffies, char_time;
int tmp;
int lsr;
if (serial_paranoia_check(info, tty->device, "rs_wait_until_sent"))
return;
if (info->state->type == PORT_UNKNOWN)
return;
if (info->xmit_fifo_size == 0)
return; // Just in case....
orig_jiffies = jiffies;
//
// Set the check interval to be 1/5 of the estimated time to
// send a single character, and make it at least 1. The check
// interval should also be less than the timeout.
//
// Note: we have to use pretty tight timings here to satisfy
// the NIST-PCTS.
//
char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
char_time = char_time / 5;
if (char_time == 0)
char_time = 1;
if (timeout && timeout < char_time)
char_time = timeout;
//
// If the transmitter hasn't cleared in twice the approximate
// amount of time to send the entire FIFO, it probably won't
// ever clear. This assumes the UART isn't doing flow
// control, which is currently the case. Hence, if it ever
// takes longer than info->timeout, this is probably due to a
// UART bug of some kind. So, we clamp the timeout parameter at
// 2*info->timeout.
//
if (!timeout || timeout > 2*info->timeout)
timeout = 2*info->timeout;
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
printk("jiff=%lu...", jiffies);
#endif
if(info->line==0||info->line==1)
{
tmp=UART_LSR;
}
/*else */
/*{ */
/*tmp=EX_UART_LSR;*/
/*} */
while (!((lsr = serial_inp(info, tmp)) & UART_LSR_TEMT)) {
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
#endif
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(char_time);
if (signal_pending(current))
break;
if (timeout && time_after(jiffies, orig_jiffies + timeout))
break;
}
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
#endif
}
/*
* rs_hangup() --- called by tty_hangup() when a hangup is signaled.
*/
static void rs_hangup(struct tty_struct *tty)
{
struct async_struct * info = (struct async_struct *)tty->driver_data;
struct serial_state *state = info->state;
if (serial_paranoia_check(info, tty->device, "rs_hangup"))
return;
state = info->state;
rs_flush_buffer(tty);
if (info->flags & ASYNC_CLOSING)
return;
shutdown(info);
info->event = 0;
state->count = 0;
info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
info->tty = 0;
wake_up_interruptible(&info->open_wait);
}
/*
* ------------------------------------------------------------
* rs_open() and friends
* ------------------------------------------------------------
*/
static int block_til_ready(struct tty_struct *tty, struct file * filp,
struct async_struct *info)
{
DECLARE_WAITQUEUE(wait, current);
struct serial_state *state = info->state;
int retval;
int do_clocal = 0, extra_count = 0;
unsigned long flags;
//
// If the device is in the middle of being closed, then block
// until it's done, and then try again.
//
if (tty_hung_up_p(filp) ||
(info->flags & ASYNC_CLOSING)) {
if (info->flags & ASYNC_CLOSING)
interruptible_sleep_on(&info->close_wait);
#ifdef SERIAL_DO_RESTART
return ((info->flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS);
#else
return -EAGAIN;
#endif
}
//
// If this is a callout device, then just make sure the normal
// device isn't being used.
//
if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
if (info->flags & ASYNC_NORMAL_ACTIVE)
return -EBUSY;
if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
(info->flags & ASYNC_SESSION_LOCKOUT) &&
(info->session != current->session))
return -EBUSY;
if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
(info->flags & ASYNC_PGRP_LOCKOUT) &&
(info->pgrp != current->pgrp))
return -EBUSY;
info->flags |= ASYNC_CALLOUT_ACTIVE;
return 0;
}
//
// If non-blocking mode is set, or the port is not enabled,
// then make the check up front and then exit.
//
if ((filp->f_flags & O_NONBLOCK) ||
(tty->flags & (1 << TTY_IO_ERROR))) {
if (info->flags & ASYNC_CALLOUT_ACTIVE)
return -EBUSY;
info->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
if (info->flags & ASYNC_CALLOUT_ACTIVE) {
if (state->normal_termios.c_cflag & CLOCAL)
do_clocal = 1;
} else {
if (tty->termios->c_cflag & CLOCAL)
do_clocal = 1;
}
//
// Block waiting for the carrier detect and the line to become
// free (i.e., not in use by the callout). While we are in
// this loop, state->count is dropped by one, so that
// rs_close() knows when to free things. We restore it upon
// exit, either normal or abnormal.
//
retval = 0;
add_wait_queue(&info->open_wait, &wait);
#ifdef SERIAL_DEBUG_OPEN
printk("block_til_ready before block: ttys%d, count = %d\n",
state->line, state->count);
#endif
save_flags(flags); cli();
if (!tty_hung_up_p(filp)) {
extra_count = 1;
state->count--;
}
restore_flags(flags);
info->blocked_open++;
while (1) {
save_flags(flags); cli();
/*
if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
(tty->termios->c_cflag & CBAUD))
serial_out(info, UART_MCR,
serial_inp(info, UART_MCR) |
(UART_MCR_DTR | UART_MCR_RTS));
*/
restore_flags(flags);
set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp) ||
!(info->flags & ASYNC_INITIALIZED)) {
#ifdef SERIAL_DO_RESTART
if (info->flags & ASYNC_HUP_NOTIFY)
retval = -EAGAIN;
else
retval = -ERESTARTSYS;
#else
retval = -EAGAIN;
#endif
break;
}
/*
if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
!(info->flags & ASYNC_CLOSING) &&
(do_clocal || (serial_in(info, UART_MSR) &
UART_MSR_DCD)))
break;
*/
break;
if (signal_pending(current)) {
retval = -ERESTARTSYS;
break;
}
#ifdef SERIAL_DEBUG_OPEN
printk("block_til_ready blocking: ttys%d, count = %d\n",
info->line, state->count);
#endif
schedule();
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&info->open_wait, &wait);
if (extra_count)
state->count++;
info->blocked_open--;
#ifdef SERIAL_DEBUG_OPEN
printk("block_til_ready after blocking: ttys%d, count = %d\n",
info->line, state->count);
#endif
if (retval)
return retval;
info->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
static int get_async_struct(int line, struct async_struct **ret_info)
{
struct async_struct *info;
struct serial_state *sstate;
sstate = rs_table + line;
sstate->count++;
if (sstate->info) {
*ret_info = sstate->info;
return 0;
}
info = kmalloc(sizeof(struct async_struct), GFP_KERNEL);
if (!info) {
sstate->count--;
return -ENOMEM;
}
memset(info, 0, sizeof(struct async_struct));
init_waitqueue_head(&info->open_wait);
init_waitqueue_head(&info->close_wait);
init_waitqueue_head(&info->delta_msr_wait);
info->magic = SERIAL_MAGIC;
info->port = sstate->port;
info->flags = sstate->flags;
info->io_type = sstate->io_type;
info->iomem_base = sstate->iomem_base;
info->iomem_reg_shift = sstate->iomem_reg_shift;
info->xmit_fifo_size = sstate->xmit_fifo_size;
info->line = line;
info->tqueue.routine = do_softint;
info->tqueue.data = info;
info->state = sstate;
if (sstate->info) {
kfree(info);
*ret_info = sstate->info;
return 0;
}
*ret_info = sstate->info = info;
return 0;
}
/*
* This routine is called whenever a serial port is opened. It
* enables interrupts for a serial port, linking in its async structure into
* the IRQ chain. It also performs the serial-specific
* initialization for the tty structure.
*/
static int rs_open(struct tty_struct *tty, struct file * filp)
{
struct async_struct *info;
int retval, line;
unsigned long page;
MOD_INC_USE_COUNT;
line = MINOR(tty->device) - tty->driver.minor_start;
if ((line < 0) || (line >= NR_PORTS)) {
MOD_DEC_USE_COUNT;
return -ENODEV;
}
retval = get_async_struct(line, &info);
if (retval) {
MOD_DEC_USE_COUNT;
return retval;
}
tty->driver_data = info;
info->tty = tty;
if (serial_paranoia_check(info, tty->device, "rs_open")) {
MOD_DEC_USE_COUNT;
return -ENODEV;
}
#ifdef SERIAL_DEBUG_OPEN
printk("rs_open %s%d, count = %d\n", tty->driver.name, info->line,
info->state->count);
#endif
#if (LINUX_VERSION_CODE > 0x20100)
info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
#endif
//
// This relies on lock_kernel() stuff so wants tidying for 2.5
//
if (!tmp_buf) {
page = get_zeroed_page(GFP_KERNEL);
if (!page) {
MOD_DEC_USE_COUNT;
return -ENOMEM;
}
if (tmp_buf)
free_page(page);
else
tmp_buf = (unsigned char *) page;
}
//
// If the port is the middle of closing, bail out now
//
if (tty_hung_up_p(filp) ||
(info->flags & ASYNC_CLOSING)) {
if (info->flags & ASYNC_CLOSING)
interruptible_sleep_on(&info->close_wait);
MOD_DEC_USE_COUNT;
#ifdef SERIAL_DO_RESTART
return ((info->flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS);
#else
return -EAGAIN;
#endif
}
//
// Start up serial port
//
retval = startup(info);
if (retval) {
MOD_DEC_USE_COUNT;
return retval;
}
retval = block_til_ready(tty, filp, info);
if (retval) {
#ifdef SERIAL_DEBUG_OPEN
printk("rs_open returning after block_til_ready with %d\n",
retval);
#endif
MOD_DEC_USE_COUNT;
return retval;
}
if ((info->state->count == 1) &&
(info->flags & ASYNC_SPLIT_TERMIOS)) {
if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
*tty->termios = info->state->normal_termios;
else
*tty->termios = info->state->callout_termios;
change_speed(info, 0);
}
#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
if (sercons.cflag && sercons.index == line) {
tty->termios->c_cflag = sercons.cflag;
sercons.cflag = 0;
change_speed(info, 0);
}
#endif
info->session = current->session;
info->pgrp = current->pgrp;
#ifdef SERIAL_DEBUG_OPEN
printk("rs_open ttys%d successful...", info->line);
#endif
return 0;
}
/*
* /proc fs routines....
*/
static _INLINE_ int line_info(char *buf, struct serial_state *state)
{
struct async_struct *info = state->info, scr_info;
// char stat_buf[30], control, status;
char stat_buf[30];
int ret;
//unsigned long flags;
ret = sprintf(buf, "%d: uart:%s port:%lX irq:%d",
state->line, uart_config[state->type].name,
state->port, state->irq);
if (!state->port || (state->type == PORT_UNKNOWN)) {
ret += sprintf(buf+ret, "\n");
return ret;
}
//
// Figure out the current RS-232 lines
//
if (!info) {
info = &scr_info; // This is just for serial_{in,out}
info->magic = SERIAL_MAGIC;
info->port = state->port;
info->flags = state->flags;
info->hub6 = state->hub6;
info->io_type = state->io_type;
info->iomem_base = state->iomem_base;
info->iomem_reg_shift = state->iomem_reg_shift;
info->quot = 0;
info->tty = 0;
}
stat_buf[0] = 0;
stat_buf[1] = 0;
if (info->quot) {
ret += sprintf(buf+ret, " baud:%d",
state->baud_base / info->quot);
}
ret += sprintf(buf+ret, " tx:%d rx:%d",
state->icount.tx, state->icount.rx);
if (state->icount.frame)
ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
if (state->icount.parity)
ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
if (state->icount.brk)
ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
if (state->icount.overrun)
ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
//
// Last thing is the RS-232 status lines
//
ret += sprintf(buf+ret, " %s\n", stat_buf+1);
return ret;
}
int rs_read_proc(char *page, char **start, off_t off, int count,
int *eof, void *data)
{
int i, len = 0, l;
off_t begin = 0;
len += sprintf(page, "serinfo:1.0 driver:%s%s revision:%s\n",
serial_version, LOCAL_VERSTRING, serial_revdate);
for (i = 0; i < NR_PORTS && len < 4000; i++) {
l = line_info(page + len, &rs_table[i]);
len += l;
if (len+begin > off+count)
goto done;
if (len+begin < off) {
begin += len;
len = 0;
}
}
*eof = 1;
done:
if (off >= len+begin)
return 0;
*start = page + (off-begin);
return ((count < begin+len-off) ? count : begin+len-off);
}
/*
* This routine prints out the appropriate serial driver version
* number, and identifies which options were configured into this
* driver.
*/
static char serial_options[] __initdata =
#ifdef CONFIG_SERIAL_DETECT_IRQ
" DETECT_IRQ"
#define SERIAL_OPT
#endif
#ifdef SERIAL_OPT
" enabled\n";
#else
" no serial options enabled\n";
#endif
#undef SERIAL_OPT
static _INLINE_ void show_serial_version(void)
{
printk(KERN_INFO "%s version %s%s (%s) with%s", serial_name,
serial_version, LOCAL_VERSTRING, serial_revdate,
serial_options);
}
/*
* This routine detect the IRQ of a serial port by clearing OUT2 when
* no UART interrupt are requested (IER = 0) (*GPL*). This seems to work at
* each time, as long as no other device permanently request the IRQ.
* If no IRQ is detected, or multiple IRQ appear, this function returns 0.
* The variable "state" and the field "state->port" should not be null.
*/
static unsigned detect_uart_irq (struct serial_state * state)
{
return 0;
}
/*
* This routine is called by rs_init() to initialize a specific serial
* port. It determines what type of UART chip this serial port is
* using: 8250, 16450, 16550, 16550A. The important question is
* whether or not this UART is a 16550A or not, since this will
* determine whether or not we can use its FIFO features or not.
*/
static void autoconfig(struct serial_state * state)
{
struct async_struct *info, scr_info;
unsigned long flags;
state->type = PORT_UNKNOWN;
#ifdef SERIAL_DEBUG_AUTOCONF
printk("Testing ttyS%d (0x%04lx, 0x%04x)...\n", state->line,
state->port, (unsigned) state->iomem_base);
#endif
if (!CONFIGURED_SERIAL_PORT(state))
return;
info = &scr_info; // This is just for serial_{in,out}
info->magic = SERIAL_MAGIC;
info->state = state;
info->line = state->line; // Qinwei 02.09.17
info->port = state->port;
info->flags = state->flags;
info->io_type = state->io_type;
info->iomem_base = state->iomem_base;
info->iomem_reg_shift = state->iomem_reg_shift;
save_flags(flags); cli();
state->type = PORT_S3C4510B;
state->xmit_fifo_size = uart_config[state->type].dfl_xmit_fifo_size;
if (state->type == PORT_UNKNOWN) {
restore_flags(flags);
return;
}
if (info->port) {
request_region(info->port,8,"serial(auto)");
}
//
// Reset the UART.
//
#ifdef CONFIG_SERIAL_SAMSUNG_IRDA
if (info->line == 1){
serial_outp(info, UART_LCR, UART_LCR_WLEN8|UART_LCR_IRDA);
CSR_WRITE(rPCONC,((3 << 20)| (3 << 22)|(3 << 24)| (3 << 26) | (3<<28)|(3 <<30))); // Enable UART1's Pin
CSR_WRITE(rPUPC,CSR_READ(rPUPC)|0xfc00); // set pull up
CSR_WRITE(rPCONE,CSR_READ(rPCONE)|1); // Enable UART0's Pin
CSR_WRITE(rPDATE,CSR_READ(rPDATE)&0xFE); // select enable IRDA
}
else
serial_outp(info, UART_LCR, UART_LCR_WLEN8); // UART0 don't support IRDA mode
#else
if(info->line==0||info->line==1)
{
serial_outp(info, UART_LCR, UART_LCR_WLEN8);
}
/*else */
/*{ */
/*serial_outp(info, EX_UART_LCR, UART_LCR_WLEN8);*/
/*} */
#endif
if(info->line==0||info->line==1)
{
serial_outp(info, UART_GCR, UART_GCR_RX_INT|UART_GCR_TX_INT);
}
/*else */
/*{ */
/*serial_outp(info, EX_UART_GCR, EX_UART_GCR_RX_INT|EX_UART_GCR_TX_INT);*/
/*} */
if(info->line==0||info->line==1)
(void)uart_in(info, UART_RX);
/*else */
/*(void)uart_in(info, EX_UART_RX);*/
restore_flags(flags);
}
int register_serial(struct serial_struct *req);
void unregister_serial(int line);
#if (LINUX_VERSION_CODE > 0x20100)
EXPORT_SYMBOL(register_serial);
EXPORT_SYMBOL(unregister_serial);
#else
static struct symbol_table serial_syms = {
#include
X(register_serial),
X(unregister_serial),
#include
};
#endif
/*
* The serial driver boot-time initialization code!
*/
static int __init rs_init(void)
{
int i;
struct serial_state * state;
init_bh(SERIAL_BH, do_serial_bh);
init_timer(&serial_timer);
serial_timer.function = rs_timer;
mod_timer(&serial_timer, jiffies + RS_STROBE_TIME);
for (i = 0; i < NR_IRQS; i++) {
IRQ_ports[i] = 0;
IRQ_timeout[i] = 0;
}
#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
//
// The interrupt of the serial console port
// can't be shared.
//
if (sercons.flags & CON_CONSDEV) {
for(i = 0; i < NR_PORTS; i++)
if (i != sercons.index &&
rs_table[i].irq == rs_table[sercons.index].irq)
rs_table[i].irq = 0;
}
#endif
show_serial_version();
// Initialize the tty_driver structure
memset(&serial_driver, 0, sizeof(struct tty_driver));
/*serial_driver.magic = TTY_DRIVE_MAGIC;*/
serial_driver.magic = SERIAL_MAGIC;
#if (LINUX_VERSION_CODE > 0x20100)
serial_driver.driver_name = "serial";
#endif
#if (LINUX_VERSION_CODE > 0x2032D && defined(CONFIG_DEVFS_FS))
serial_driver.name = "tts/%d";
#else
serial_driver.name = "ttyS";
#endif
serial_driver.major = TTY_MAJOR;
serial_driver.minor_start = 64 + SERIAL_DEV_OFFSET;
serial_driver.num = NR_PORTS;
serial_driver.type = TTY_DRIVER_TYPE_SERIAL;
serial_driver.subtype = SERIAL_TYPE_NORMAL;
serial_driver.init_termios = tty_std_termios;
serial_driver.init_termios.c_cflag =
B115200 | CS8 | CREAD | HUPCL | CLOCAL;
serial_driver.flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS;
serial_driver.refcount = &serial_refcount;
serial_driver.table = serial_table;
serial_driver.termios = serial_termios;
serial_driver.termios_locked = serial_termios_locked;
serial_driver.open = rs_open;
serial_driver.close = rs_close;
serial_driver.write = rs_write;
serial_driver.put_char = rs_put_char;
serial_driver.flush_chars = rs_flush_chars;
serial_driver.write_room = rs_write_room;
serial_driver.chars_in_buffer = rs_chars_in_buffer;
serial_driver.flush_buffer = rs_flush_buffer;
serial_driver.ioctl = rs_ioctl;
serial_driver.throttle = rs_throttle;
serial_driver.unthrottle = rs_unthrottle;
serial_driver.set_termios = rs_set_termios;
serial_driver.stop = rs_stop;
serial_driver.start = rs_start;
serial_driver.hangup = rs_hangup;
#if (LINUX_VERSION_CODE >= 131394) // Linux 2.1.66
serial_driver.break_ctl = rs_break;
#endif
#if (LINUX_VERSION_CODE >= 131343)
serial_driver.send_xchar = rs_send_xchar;
serial_driver.wait_until_sent = rs_wait_until_sent;
serial_driver.read_proc = rs_read_proc;
#endif
//
// The callout device is just like normal device except for
// major number and the subtype code.
//
callout_driver = serial_driver;
#if (LINUX_VERSION_CODE > 0x2032D && defined(CONFIG_DEVFS_FS))
callout_driver.name = "cua/%d";
#else
callout_driver.name = "cua";
#endif
callout_driver.major = TTYAUX_MAJOR;
callout_driver.subtype = SERIAL_TYPE_CALLOUT;
#if (LINUX_VERSION_CODE >= 131343)
callout_driver.read_proc = 0;
callout_driver.proc_entry = 0;
#endif
if (tty_register_driver(&serial_driver))
panic("Couldn't register serial driver\n");
if (tty_register_driver(&callout_driver))
panic("Couldn't register callout driver\n");
for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
state->magic = SSTATE_MAGIC;
state->line = i;
state->type = PORT_UNKNOWN;
state->custom_divisor = 0;
state->close_delay = 5*HZ/10;
state->closing_wait = 30*HZ;
state->callout_termios = callout_driver.init_termios;
state->normal_termios = serial_driver.init_termios;
state->icount.cts = state->icount.dsr =
state->icount.rng = state->icount.dcd = 0;
state->icount.rx = state->icount.tx = 0;
state->icount.frame = state->icount.parity = 0;
state->icount.overrun = state->icount.brk = 0;
state->irq = irq_cannonicalize(state->irq);
if (state->hub6)
state->io_type = SERIAL_IO_HUB6;
if (state->port && check_region(state->port,8))
continue;
#ifdef CONFIG_MCA
if ((state->flags & ASYNC_BOOT_ONLYMCA) && !MCA_bus)
continue;
#endif
if (state->flags & ASYNC_BOOT_AUTOCONF)
autoconfig(state);
}
for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
if (state->type == PORT_UNKNOWN)
continue;
if ( (state->flags & ASYNC_BOOT_AUTOCONF)
&& (state->flags & ASYNC_AUTO_IRQ)
&& (state->port != 0))
state->irq = detect_uart_irq(state);
printk(KERN_INFO "ttyS%02d%s at 0x%04lx (irq = %d) is a %s\n",
state->line + SERIAL_DEV_OFFSET,
(state->flags & ASYNC_FOURPORT) ? " FourPort" : "",
state->port, state->irq,
uart_config[state->type].name);
tty_register_devfs(&serial_driver, 0,
serial_driver.minor_start + state->line);
tty_register_devfs(&callout_driver, 0,
callout_driver.minor_start + state->line);
}
return 0;
}
static void __exit rs_fini(void)
{
unsigned long flags;
int e1, e2;
int i;
struct async_struct *info;
// printk("Unloading %s: version %s\n", serial_name, serial_version);
del_timer_sync(&serial_timer);
save_flags(flags); cli();
remove_bh(SERIAL_BH);
if ((e1 = tty_unregister_driver(&serial_driver)))
printk("serial: failed to unregister serial driver (%d)\n",
e1);
if ((e2 = tty_unregister_driver(&callout_driver)))
printk("serial: failed to unregister callout driver (%d)\n",
e2);
restore_flags(flags);
for (i = 0; i < NR_PORTS; i++) {
if ((info = rs_table[i].info)) {
rs_table[i].info = NULL;
kfree(info);
}
if ((rs_table[i].type != PORT_UNKNOWN) && rs_table[i].port) {
release_region(rs_table[i].port, 8);
}
}
if (tmp_buf) {
unsigned long pg = (unsigned long) tmp_buf;
tmp_buf = NULL;
free_page(pg);
}
}
module_init(rs_init);
module_exit(rs_fini);
MODULE_DESCRIPTION("Standard/generic (dumb) serial driver");
MODULE_AUTHOR("Theodore Ts'o ");
MODULE_LICENSE("GPL");
#ifndef CONFIG_SERIAL_SAMSUNG_CONSOLE
#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
/*
* Wait for transmitter & holding register to empty
*/
static _INLINE_ void wait_for_xmitr(struct async_struct *info)
{
unsigned int status, tmout = 1000000;
do {
if(info->line==0||info->line==1)
status = serial_in(info, UART_LSR);
else
status = serial_in(info, EX_UART_LSR);
if (--tmout == 0)
break;
} while((status & BOTH_EMPTY) != BOTH_EMPTY);
}
#endif
/*
* ------------------------------------------------------------
* Serial console driver
* ------------------------------------------------------------
*/
#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
static struct async_struct async_sercons;
/*
* Wait for transmitter & holding register to empty
*/
static _INLINE_ void wait_for_xmitr(struct async_struct *info)
{
unsigned int status, tmout = 1000000;
do {
if(info->line==0||info->line==1)
status = serial_in(info, UART_LSR);
else
status = serial_in(info, EX_UART_LSR);
if (status & UART_LSR_BI)
lsr_break_flag = UART_LSR_BI;
if (--tmout == 0)
break;
} while((status & BOTH_EMPTY) != BOTH_EMPTY);
}
/*
* Print a string to the serial port trying not to disturb
* any possible real use of the port...
*
* The console must be locked when we get here.
*/
static void serial_console_write(struct console *co, const char *s,
unsigned count)
{
static struct async_struct *info = &async_sercons;
unsigned i;
/*
* First save the IER then disable the interrupts
*/
/*
* Now, do each character
*/
for (i = 0; i < count; i++, s++) {
wait_for_xmitr(info);
/*
* Send the character out.
* If a LF, also do CR...
*/
if(info->line==0||info->line==1)
uart_out(info, UART_TX, *s);
/*else */
/*uart_out(info, EX_UART_TX, *s);*/
if (*s == 10) {
wait_for_xmitr(info);
if(info->line==0||info->line==1)
uart_out(info, UART_TX, 13);
/*else */
/*uart_out(info, EX_UART_TX, 13);*/
}
}
/*
* Finally, Wait for transmitter & holding register to empty
* and restore the IER
*/
wait_for_xmitr(info);
}
/*
* Receive character from the serial port
*/
static int serial_console_wait_key(struct console *co)
{
static struct async_struct *info;
int c;
int tmp;
info = &async_sercons;
/*
* First save the IER then disable the interrupts so
* that the real driver for the port does not get the
* character.
*/
if(info->line==0||info->line==1)
tmp=UART_LSR;
/*else */
/*tmp=EX_UART_LSR;*/
while ((serial_in(info, tmp) & UART_LSR_DR) == 0);
if(info->line==0||info->line==1)
c = uart_in(info, UART_RX);
/*else */
/*c = uart_in(info, EX_UART_RX);*/
return c;
}
static kdev_t serial_console_device(struct console *c)
{
return MKDEV(TTY_MAJOR, 64 + c->index);
}
/*
* Setup initial baud/bits/parity/flow control. We do two things here:
* - construct a cflag setting for the first rs_open()
* - initialize the serial port
* Return non-zero if we didn't find a serial port.
*/
static int __init serial_console_setup(struct console *co, char *options)
{
static struct async_struct *info;
struct serial_state *state;
unsigned cval;
int baud = 115200;
int bits = 8;
int parity = 'n';
int doflow = 0;
int cflag = CREAD | HUPCL | CLOCAL;
int quot = 0;
char *s;
if (options) {
baud = simple_strtoul(options, NULL, 10);
s = options;
while(*s >= '0' && *s <= '9')
s++;
if (*s) parity = *s++;
if (*s) bits = *s++ - '0';
if (*s) doflow = (*s++ == 'r');
}
/*
* Now construct a cflag setting.
*/
switch(baud) {
case 1200:
cflag |= B1200;
break;
case 2400:
cflag |= B2400;
break;
case 4800:
cflag |= B4800;
break;
case 19200:
cflag |= B19200;
break;
case 38400:
cflag |= B38400;
break;
case 57600:
cflag |= B57600;
break;
case 115200:
cflag |= B115200;
break;
case 9600:
default:
cflag |= B9600;
/*
* Set this to a sane value to prevent a divide error
*/
baud = 9600;
break;
}
switch(bits) {
case 7:
cflag |= CS7;
break;
default:
case 8:
cflag |= CS8;
break;
}
switch(parity) {
case 'o': case 'O':
cflag |= PARODD;
break;
case 'e': case 'E':
cflag |= PARENB;
break;
}
co->cflag = cflag;
/*
* Divisor, bytesize and parity
*/
state = rs_table + co->index;
if (doflow)
state->flags |= ASYNC_CONS_FLOW;
info = &async_sercons;
info->magic = SERIAL_MAGIC;
info->state = state;
info->port = state->port;
info->flags = state->flags;
info->io_type = state->io_type;
info->iomem_base = state->iomem_base;
info->iomem_reg_shift = state->iomem_reg_shift;
quot = state->baud_base / baud;
cval = cflag & (CSIZE | CSTOPB);
cval >>= 4;
if (cflag & PARENB)
{
cval |= UART_LCR_PARITY;
if (!(cflag & PARODD))
cval |= UART_LCR_EPAR;
}
/* set up uart's IO Pins*/
if (info->line){
CSR_WRITE(rPCONC,((3 << 20)| (3 << 22)|(3 << 24)| (3 << 26) | (3<<28)|(3 <<30))); // Enable UART1's Pin
CSR_WRITE(rPUPC,CSR_READ(rPUPC)|0xfc00); // set pull up
#ifdef CONFIG_SERIAL_SAMSUNG_IRDA
CSR_WRITE(rPCONE,CSR_READ(rPCONE)|1); // Enable UART0's Pin
CSR_WRITE(rPDATE,CSR_READ(rPDATE)&0xFE); // select enable IRDA
#endif
}
else{
CSR_WRITE(rPCONE,CSR_READ(rPCONE)|(2 << 2) | (2 << 4));
}
/*
* Disable UART interrupts, set DTR and RTS high
* and set speed.
*/
if(info->line==0||info->line==1)
{
serial_out(info, UART_BDR, baudrate_div(baud));
serial_out(info, UART_LCR, cval);
serial_out(info, UART_GCR, UART_GCR_RX_INT|UART_GCR_TX_INT);
}
/*else */
/*{ */
/*serial_outp(info, EX_UART_LCR, 0x80); //set line ctrol */
/*serial_outp(info, EX_UART_BDR, 115200%baud); */
/*serial_outp(info, EX_UART_BDR+1, 115200/baud); */
/*serial_outp(info, EX_UART_LCR, cval); //re set line ctrol */
/*serial_outp(info, EX_UART_GCR, EX_UART_GCR_RX_INT|EX_UART_GCR_TX_INT);*/
/**/
/*} */
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,
};
/*
* Register console.
*/
void __init samsung_console_init(void)
{
register_console(&sercons);
}
#endif
/*
Local variables:
compile-command: "gcc -D__KERNEL__ -I../../include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -fno-strict-aliasing -pipe -fno-strength-reduce -march=i586 -DMODULE -DMODVERSIONS -include ../../include/linux/modversions.h -DEXPORT_SYMTAB -c serial.c"
End:
*/