patch-2.4.22 linux-2.4.22/arch/mips/baget/vacserial.c
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- Lines: 2906
- Date:
1969-12-31 16:00:00.000000000 -0800
- Orig file:
linux-2.4.21/arch/mips/baget/vacserial.c
- Orig date:
2002-08-02 17:39:43.000000000 -0700
diff -urN linux-2.4.21/arch/mips/baget/vacserial.c linux-2.4.22/arch/mips/baget/vacserial.c
@@ -1,2905 +0,0 @@
-/*
- * vacserial.c: VAC UART serial driver
- * This code stealed and adopted from linux/drivers/char/serial.c
- * See that for author info
- *
- * Copyright (C) 1998 Gleb Raiko & Vladimir Roganov
- */
-
-#undef SERIAL_PARANOIA_CHECK
-#define CONFIG_SERIAL_NOPAUSE_IO
-#define SERIAL_DO_RESTART
-
-#define CONFIG_SERIAL_SHARE_IRQ
-
-/* Set of debugging defines */
-
-#undef SERIAL_DEBUG_INTR
-#undef SERIAL_DEBUG_OPEN
-#undef SERIAL_DEBUG_FLOW
-#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
-
-#define RS_STROBE_TIME (10*HZ)
-#define RS_ISR_PASS_LIMIT 2 /* Beget is not a super-computer (old=256) */
-
-#define IRQ_T(state) \
- ((state->flags & ASYNC_SHARE_IRQ) ? SA_SHIRQ : SA_INTERRUPT)
-
-#define SERIAL_INLINE
-
-#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
-#define DBG_CNT(s) baget_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
-
-#define QUAD_UART_SPEED /* Useful for Baget */
-
-/*
- * End of serial driver configuration section.
- */
-
-#include <linux/config.h>
-#include <linux/module.h>
-#include <linux/errno.h>
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/timer.h>
-#include <linux/interrupt.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/serial.h>
-#include <linux/major.h>
-#include <linux/string.h>
-#include <linux/fcntl.h>
-#include <linux/ptrace.h>
-#include <linux/ioport.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/delay.h>
-#ifdef CONFIG_SERIAL_CONSOLE
-#include <linux/console.h>
-#endif
-
-#include <asm/system.h>
-#include <asm/io.h>
-#include <asm/irq.h>
-#include <asm/uaccess.h>
-#include <asm/bitops.h>
-#include <asm/serial.h>
-#include <asm/baget/baget.h>
-
-#define BAGET_VAC_UART_IRQ 0x35
-
-/*
- * Implementation note:
- * It was descovered by means of advanced electronic tools,
- * if the driver works via TX_READY interrupts then VIC generates
- * strange self-eliminating traps. Thus, the driver is rewritten to work
- * via TX_EMPTY
- */
-
-/* VAC-specific check/debug switches */
-
-#undef CHECK_REG_INDEX
-#undef DEBUG_IO_PORT_A
-
-#ifdef SERIAL_INLINE
-#define _INLINE_ inline
-#endif
-
-static char *serial_name = "VAC Serial driver";
-static char *serial_version = "4.26";
-
-static DECLARE_TASK_QUEUE(tq_serial);
-
-static struct tty_driver serial_driver, callout_driver;
-static int serial_refcount;
-
-/* 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_CONSOLE
-static struct console sercons;
-#endif
-
-static void autoconfig(struct serial_state * info);
-static void change_speed(struct async_struct *info);
-static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
-static void rs_timer(unsigned long dummy);
-
-static struct timer_list vacs_timer;
-
-/*
- * Here we define the default xmit fifo size used for each type of
- * UART
- */
-static struct serial_uart_config uart_config[] = {
- { "unknown", 1, 0 }, /* Must go first -- used as unasigned */
- { "VAC UART", 1, 0 }
-};
-#define VAC_UART_TYPE 1 /* Just index in above array */
-
-static struct serial_state rs_table[] = {
-/*
- * VAC has tricky layout for pair of his SIO registers,
- * so we need special function to access ones.
- * To identify port we use their TX offset
- */
- { 0, 9600, VAC_UART_B_TX, BAGET_VAC_UART_IRQ,
- STD_COM_FLAGS }, /* VAC UART B */
- { 0, 9600, VAC_UART_A_TX, BAGET_VAC_UART_IRQ,
- STD_COM_FLAGS } /* VAC UART A */
-};
-
-#define NR_PORTS (sizeof(rs_table)/sizeof(struct serial_state))
-
-static struct tty_struct *serial_table[NR_PORTS];
-static struct termios *serial_termios[NR_PORTS];
-static struct termios *serial_termios_locked[NR_PORTS];
-
-#ifndef MIN
-#define MIN(a,b) ((a) < (b) ? (a) : (b))
-#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;
-static DECLARE_MUTEX(tmp_buf_sem);
-
-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;
-}
-
-/*
- To unify UART A/B access we will use following function
- to compute register offsets by register index.
- */
-
-#define VAC_UART_MODE 0
-#define VAC_UART_TX 1
-#define VAC_UART_RX 2
-#define VAC_UART_INT_MASK 3
-#define VAC_UART_INT_STATUS 4
-
-#define VAC_UART_REG_NR 5
-
-static inline int uart_offset_map(unsigned long port, int reg_index)
-{
- static const unsigned int ind_to_reg[VAC_UART_REG_NR][NR_PORTS] = {
- { VAC_UART_B_MODE, VAC_UART_A_MODE },
- { VAC_UART_B_TX, VAC_UART_A_TX },
- { VAC_UART_B_RX, VAC_UART_A_RX },
- { VAC_UART_B_INT_MASK, VAC_UART_A_INT_MASK },
- { VAC_UART_B_INT_STATUS, VAC_UART_A_INT_STATUS }
- };
-#ifdef CHECK_REG_INDEX
- if (reg_index > VAC_UART_REG_NR) panic("vacserial: bad reg_index");
-#endif
- return ind_to_reg[reg_index][port == VAC_UART_B_TX ? 0 : 1];
-}
-
-static inline unsigned int serial_inw(struct async_struct *info, int offset)
-{
- int val = vac_inw(uart_offset_map(info->port,offset));
-#ifdef DEBUG_IO_PORT_A
- if (info->port == VAC_UART_A_TX)
- printk("UART_A_IN: reg = 0x%04x, val = 0x%04x\n",
- uart_offset_map(info->port,offset), val);
-#endif
- return val;
-}
-
-static inline unsigned int serial_inp(struct async_struct *info, int offset)
-{
- return serial_inw(info, offset);
-}
-
-static inline unsigned int serial_in(struct async_struct *info, int offset)
-{
- return serial_inw(info, offset);
-}
-
-static inline void serial_outw(struct async_struct *info,int offset, int value)
-{
-#ifdef DEBUG_IO_PORT_A
- if (info->port == VAC_UART_A_TX)
- printk("UART_A_OUT: offset = 0x%04x, val = 0x%04x\n",
- uart_offset_map(info->port,offset), value);
-#endif
- vac_outw(value, uart_offset_map(info->port,offset));
-}
-
-static inline void serial_outp(struct async_struct *info,int offset, int value)
-{
- serial_outw(info,offset,value);
-}
-
-static inline void serial_out(struct async_struct *info,int offset, int value)
-{
- serial_outw(info,offset,value);
-}
-
-/*
- * ------------------------------------------------------------
- * 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();
- if (info->IER & VAC_UART_INT_TX_EMPTY) {
- info->IER &= ~VAC_UART_INT_TX_EMPTY;
- serial_out(info, VAC_UART_INT_MASK, info->IER);
- }
- restore_flags(flags);
-}
-
-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_cnt && info->xmit_buf
- && !(info->IER & VAC_UART_INT_TX_EMPTY)) {
- info->IER |= VAC_UART_INT_TX_EMPTY;
- serial_out(info, VAC_UART_INT_MASK, info->IER);
- }
- 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 tty_struct *tty = info->tty;
- unsigned short rx;
- unsigned char ch;
- int ignored = 0;
- struct async_icount *icount;
-
- icount = &info->state->icount;
- do {
- rx = serial_inw(info, VAC_UART_RX);
- ch = VAC_UART_RX_DATA_MASK & rx;
-
- if (tty->flip.count >= TTY_FLIPBUF_SIZE)
- break;
- *tty->flip.char_buf_ptr = ch;
- icount->rx++;
-
-#ifdef SERIAL_DEBUG_INTR
- baget_printk("DR%02x:%02x...", rx, *status);
-#endif
- *tty->flip.flag_buf_ptr = 0;
- if (*status & (VAC_UART_STATUS_RX_BREAK_CHANGE
- | VAC_UART_STATUS_RX_ERR_PARITY
- | VAC_UART_STATUS_RX_ERR_FRAME
- | VAC_UART_STATUS_RX_ERR_OVERRUN)) {
- /*
- * For statistics only
- */
- if (*status & VAC_UART_STATUS_RX_BREAK_CHANGE) {
- *status &= ~(VAC_UART_STATUS_RX_ERR_FRAME
- | VAC_UART_STATUS_RX_ERR_PARITY);
- icount->brk++;
- } else if (*status & VAC_UART_STATUS_RX_ERR_PARITY)
- icount->parity++;
- else if (*status & VAC_UART_STATUS_RX_ERR_FRAME)
- icount->frame++;
- if (*status & VAC_UART_STATUS_RX_ERR_OVERRUN)
- icount->overrun++;
-
- /*
- * Now check to see if character should be
- * ignored, and mask off conditions which
- * should be ignored.
- */
- if (*status & info->ignore_status_mask) {
- if (++ignored > 100)
- break;
- goto ignore_char;
- }
- *status &= info->read_status_mask;
-
- if (*status & (VAC_UART_STATUS_RX_BREAK_CHANGE)) {
-#ifdef SERIAL_DEBUG_INTR
- baget_printk("handling break....");
-#endif
- *tty->flip.flag_buf_ptr = TTY_BREAK;
- if (info->flags & ASYNC_SAK)
- do_SAK(tty);
- } else if (*status & VAC_UART_STATUS_RX_ERR_PARITY)
- *tty->flip.flag_buf_ptr = TTY_PARITY;
- else if (*status & VAC_UART_STATUS_RX_ERR_FRAME)
- *tty->flip.flag_buf_ptr = TTY_FRAME;
- if (*status & VAC_UART_STATUS_RX_ERR_OVERRUN) {
- /*
- * 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:
- *status = serial_inw(info, VAC_UART_INT_STATUS);
- } while ((*status & VAC_UART_STATUS_RX_READY));
- tty_flip_buffer_push(tty);
-}
-
-static _INLINE_ void transmit_chars(struct async_struct *info, int *intr_done)
-{
- int count;
-
- if (info->x_char) {
- serial_outw(info, VAC_UART_TX,
- (((unsigned short)info->x_char)<<8));
- info->state->icount.tx++;
- info->x_char = 0;
- if (intr_done)
- *intr_done = 0;
- return;
- }
- if ((info->xmit_cnt <= 0) || info->tty->stopped ||
- info->tty->hw_stopped) {
- info->IER &= ~VAC_UART_INT_TX_EMPTY;
- serial_outw(info, VAC_UART_INT_MASK, info->IER);
- return;
- }
- count = info->xmit_fifo_size;
- do {
- serial_out(info, VAC_UART_TX,
- (unsigned short)info->xmit_buf[info->xmit_tail++] \
- << 8);
- info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
- info->state->icount.tx++;
- if (--info->xmit_cnt <= 0)
- break;
- } while (--count > 0);
-
- if (info->xmit_cnt < WAKEUP_CHARS)
- rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
-
-#ifdef SERIAL_DEBUG_INTR
- baget_printk("THRE...");
-#endif
- if (intr_done)
- *intr_done = 0;
-
- if (info->xmit_cnt <= 0) {
- info->IER &= ~VAC_UART_INT_TX_EMPTY;
- serial_outw(info, VAC_UART_INT_MASK, info->IER);
- }
-}
-
-static _INLINE_ void check_modem_status(struct async_struct *info)
-{
-#if 0 /* VAC hasn't modem control */
- wake_up_interruptible(&info->open_wait);
- rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
-#endif
-}
-
-#ifdef CONFIG_SERIAL_SHARE_IRQ
-
-
-/*
- * Specific functions needed for VAC UART interrupt enter/leave
- */
-
-#define VAC_INT_CTRL_UART_ENABLE \
- (VAC_INT_CTRL_TIMER_PIO10|VAC_INT_CTRL_UART_B_PIO7|VAC_INT_CTRL_UART_A_PIO7)
-
-#define VAC_INT_CTRL_UART_DISABLE(info) \
- (VAC_INT_CTRL_TIMER_PIO10 | \
- ((info->port == VAC_UART_A_TX) ? \
- (VAC_INT_CTRL_UART_A_DISABLE|VAC_INT_CTRL_UART_B_PIO7) : \
- (VAC_INT_CTRL_UART_A_PIO7|VAC_INT_CTRL_UART_B_DISABLE)))
-
-/*
- * Following two functions were proposed by Pavel Osipenko
- * to make VAC/VIC behaviour more regular.
- */
-static void intr_begin(struct async_struct* info)
-{
- serial_outw(info, VAC_UART_INT_MASK, 0);
-}
-
-static void intr_end(struct async_struct* info)
-{
- vac_outw(VAC_INT_CTRL_UART_DISABLE(info), VAC_INT_CTRL);
- vac_outw(VAC_INT_CTRL_UART_ENABLE, VAC_INT_CTRL);
-
- serial_outw(info, VAC_UART_INT_MASK, info->IER);
-}
-
-/*
- * This is the serial driver's generic interrupt routine
- */
-static void rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
-{
- int status;
- struct async_struct * info;
- int pass_counter = 0;
- struct async_struct *end_mark = 0;
-
-#ifdef SERIAL_DEBUG_INTR
- baget_printk("rs_interrupt(%d)...", irq);
-#endif
-
- info = IRQ_ports[irq];
- if (!info)
- return;
-
- do {
- intr_begin(info); /* Mark we begin port handling */
-
- if (!info->tty ||
- (serial_inw (info, VAC_UART_INT_STATUS)
- & VAC_UART_STATUS_INTS) == 0)
- {
- if (!end_mark)
- end_mark = info;
- goto next;
- }
- end_mark = 0;
-
- info->last_active = jiffies;
-
- status = serial_inw(info, VAC_UART_INT_STATUS);
-#ifdef SERIAL_DEBUG_INTR
- baget_printk("status = %x...", status);
-#endif
- if (status & VAC_UART_STATUS_RX_READY) {
- receive_chars(info, &status);
- }
- check_modem_status(info);
- if (status & VAC_UART_STATUS_TX_EMPTY)
- transmit_chars(info, 0);
-
- next:
- intr_end(info); /* Mark this port handled */
-
- info = info->next_port;
- if (!info) {
- info = IRQ_ports[irq];
- if (pass_counter++ > RS_ISR_PASS_LIMIT) {
- break; /* Prevent infinite loops */
- }
- continue;
- }
- } while (end_mark != info);
-#ifdef SERIAL_DEBUG_INTR
- baget_printk("end.\n");
-#endif
-
-
-}
-#endif /* #ifdef CONFIG_SERIAL_SHARE_IRQ */
-
-
-/* The original driver was simplified here:
- two functions were joined to reduce code */
-
-#define rs_interrupt_single rs_interrupt
-
-
-/*
- * -------------------------------------------------------------------
- * 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);
- }
-}
-
-/*
- * ---------------------------------------------------------------
- * 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 ? timeout : 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_free_page(GFP_KERNEL);
- if (!page)
- return -ENOMEM;
-
- save_flags(flags); cli();
-
- if (info->flags & ASYNC_INITIALIZED) {
- free_page(page);
- goto errout;
- }
- if (!state->port || !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
- baget_printk("starting up ttys%d (irq %d)...", info->line, state->irq);
-#endif
-
- if (uart_config[info->state->type].flags & UART_STARTECH) {
- /* Wake up UART */
- serial_outp(info, VAC_UART_MODE, 0);
- serial_outp(info, VAC_UART_INT_MASK, 0);
- }
-
- /*
- * Allocate the IRQ if necessary
- */
- if (state->irq && (!IRQ_ports[state->irq] ||
- !IRQ_ports[state->irq]->next_port)) {
-
- if (IRQ_ports[state->irq]) {
-#ifdef CONFIG_SERIAL_SHARE_IRQ
- free_irq(state->irq, NULL);
- handler = rs_interrupt;
-#else
- retval = -EBUSY;
- goto errout;
-#endif /* CONFIG_SERIAL_SHARE_IRQ */
- } else
- handler = rs_interrupt_single;
-
-
- retval = request_irq(state->irq, handler, IRQ_T(state),
- "serial", NULL);
- 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;
- IRQ_ports[state->irq] = info;
- figure_IRQ_timeout(state->irq);
-
- /*
- * Clear the interrupt registers.
- */
- /* (void) serial_inw(info, VAC_UART_INT_STATUS); */ /* (see above) */
- (void) serial_inw(info, VAC_UART_RX);
-
- /*
- * Now, initialize the UART
- */
- serial_outp(info, VAC_UART_MODE, VAC_UART_MODE_INITIAL); /*reset DLAB*/
-
- /*
- * Finally, enable interrupts
- */
- info->IER = VAC_UART_INT_RX_BREAK_CHANGE | VAC_UART_INT_RX_ERRS | \
- VAC_UART_INT_RX_READY;
- serial_outp(info, VAC_UART_INT_MASK, info->IER); /*enable interrupts*/
-
- /*
- * And clear the interrupt registers again for luck.
- */
- (void)serial_inp(info, VAC_UART_INT_STATUS);
- (void)serial_inp(info, VAC_UART_RX);
-
- if (info->tty)
- clear_bit(TTY_IO_ERROR, &info->tty->flags);
- info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
-
- /*
- * Set up serial timers...
- */
- mod_timer(&vacs_timer, jiffies + 2*HZ/100);
-
- /*
- * and set the speed of the serial port
- */
- change_speed(info);
-
- 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
- baget_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
- */
- if (state->irq && (!IRQ_ports[state->irq] ||
- !IRQ_ports[state->irq]->next_port)) {
- if (IRQ_ports[state->irq]) {
- free_irq(state->irq, NULL);
- retval = request_irq(state->irq, rs_interrupt_single,
- IRQ_T(state), "serial", NULL);
-
- if (retval)
- printk("serial shutdown: request_irq: error %d"
- " Couldn't reacquire IRQ.\n", retval);
- } else
- free_irq(state->irq, NULL);
- }
-
- if (info->xmit_buf) {
- free_page((unsigned long) info->xmit_buf);
- info->xmit_buf = 0;
- }
-
- info->IER = 0;
- serial_outp(info, VAC_UART_INT_MASK, 0x00); /* disable all intrs */
-
- /* disable break condition */
- serial_out(info, VAC_UART_MODE, serial_inp(info, VAC_UART_MODE) & \
- ~VAC_UART_MODE_SEND_BREAK);
-
- if (info->tty)
- set_bit(TTY_IO_ERROR, &info->tty->flags);
-
- info->flags &= ~ASYNC_INITIALIZED;
- restore_flags(flags);
-}
-
-/*
- * When we set line mode, we call this function
- * for Baget-specific adjustments.
- */
-
-static inline unsigned short vac_uart_mode_fixup (unsigned short cval)
-{
-#ifdef QUAD_UART_SPEED
- /*
- * When we are using 4-x advantage in speed:
- *
- * Disadvantage : can't support 75, 150 bauds
- * Advantage : can support 19200, 38400 bauds
- */
- char speed = 7 & (cval >> 10);
- cval &= ~(7 << 10);
- cval |= VAC_UART_MODE_BAUD(speed-2);
-#endif
-
- /*
- * In general, we have Tx and Rx ON all time
- * and use int mask flag for their disabling.
- */
- cval |= VAC_UART_MODE_RX_ENABLE;
- cval |= VAC_UART_MODE_TX_ENABLE;
- cval |= VAC_UART_MODE_CHAR_RX_ENABLE;
- cval |= VAC_UART_MODE_CHAR_TX_ENABLE;
-
- /* Low 4 bits are not used in UART */
- cval &= ~0xf;
-
- return cval;
-}
-
-/*
- * 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)
-{
- unsigned short port;
- int quot = 0, baud_base, baud;
- unsigned cflag, cval;
- int bits;
- unsigned long flags;
-
- if (!info->tty || !info->tty->termios)
- return;
- cflag = info->tty->termios->c_cflag;
- if (!(port = info->port))
- return;
-
- /* byte size and parity */
- switch (cflag & CSIZE) {
- case CS7: cval = 0x0; bits = 9; break;
- case CS8: cval = VAC_UART_MODE_8BIT_CHAR; bits = 10; break;
- /* Never happens, but GCC is too dumb to figure it out */
- case CS5:
- case CS6:
- default: cval = 0x0; bits = 9; break;
- }
- cval &= ~VAC_UART_MODE_PARITY_ENABLE;
- if (cflag & PARENB) {
- cval |= VAC_UART_MODE_PARITY_ENABLE;
- bits++;
- }
- if (cflag & PARODD)
- cval |= VAC_UART_MODE_PARITY_ODD;
-
- /* 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;
- if (baud == 38400 &&
- ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
- quot = info->state->custom_divisor;
- else {
- if (baud == 134)
- /* Special case since 134 is really 134.5 */
- quot = (2*baud_base / 269);
- else if (baud)
- quot = baud_base / baud;
- }
- /* If the quotient is ever zero, default to 9600 bps */
- if (!quot)
- quot = baud_base / 9600;
- info->quot = quot;
- info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
- info->timeout += HZ/50; /* Add .02 seconds of slop */
-
- serial_out(info, VAC_UART_INT_MASK, info->IER);
-
- /*
- * Set up parity check flag
- */
-#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
-
- info->read_status_mask = VAC_UART_STATUS_RX_ERR_OVERRUN | \
- VAC_UART_STATUS_TX_EMPTY | VAC_UART_STATUS_RX_READY;
- if (I_INPCK(info->tty))
- info->read_status_mask |= VAC_UART_STATUS_RX_ERR_FRAME | \
- VAC_UART_STATUS_RX_ERR_PARITY;
- if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
- info->read_status_mask |= VAC_UART_STATUS_RX_BREAK_CHANGE;
-
- /*
- * Characters to ignore
- */
- info->ignore_status_mask = 0;
- if (I_IGNPAR(info->tty))
- info->ignore_status_mask |= VAC_UART_STATUS_RX_ERR_PARITY | \
- VAC_UART_STATUS_RX_ERR_FRAME;
- if (I_IGNBRK(info->tty)) {
- info->ignore_status_mask |= VAC_UART_STATUS_RX_BREAK_CHANGE;
- /*
- * If we're ignore parity and break indicators, ignore
- * overruns too. (For real raw support).
- */
- if (I_IGNPAR(info->tty))
- info->ignore_status_mask |= \
- VAC_UART_STATUS_RX_ERR_OVERRUN;
- }
- /*
- * !!! ignore all characters if CREAD is not set
- */
- if ((cflag & CREAD) == 0)
- info->ignore_status_mask |= VAC_UART_STATUS_RX_READY;
- save_flags(flags); cli();
-
-
- switch (baud) {
- default:
- case 9600:
- cval |= VAC_UART_MODE_BAUD(7);
- break;
- case 4800:
- cval |= VAC_UART_MODE_BAUD(6);
- break;
- case 2400:
- cval |= VAC_UART_MODE_BAUD(5);
- break;
- case 1200:
- cval |= VAC_UART_MODE_BAUD(4);
- break;
- case 600:
- cval |= VAC_UART_MODE_BAUD(3);
- break;
- case 300:
- cval |= VAC_UART_MODE_BAUD(2);
- break;
-#ifndef QUAD_UART_SPEED
- case 150:
-#else
- case 38400:
-#endif
- cval |= VAC_UART_MODE_BAUD(1);
- break;
-#ifndef QUAD_UART_SPEED
- case 75:
-#else
- case 19200:
-#endif
- cval |= VAC_UART_MODE_BAUD(0);
- break;
- }
-
- /* Baget VAC need some adjustments for computed value */
- cval = vac_uart_mode_fixup(cval);
-
- serial_outp(info, VAC_UART_MODE, cval);
- 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 (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1) {
- restore_flags(flags);
- return;
- }
-
- info->xmit_buf[info->xmit_head++] = ch;
- info->xmit_head &= SERIAL_XMIT_SIZE-1;
- info->xmit_cnt++;
- 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_cnt <= 0 || tty->stopped || tty->hw_stopped ||
- !info->xmit_buf)
- return;
-
- save_flags(flags); cli();
- info->IER |= VAC_UART_INT_TX_EMPTY;
- serial_out(info, VAC_UART_INT_MASK, info->IER);
- 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) {
- c = MIN(count,
- MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
- SERIAL_XMIT_SIZE - info->xmit_head));
- if (c <= 0)
- break;
-
- c -= copy_from_user(tmp_buf, buf, c);
- if (!c) {
- if (!ret)
- ret = -EFAULT;
- break;
- }
- cli();
- c = MIN(c, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
- SERIAL_XMIT_SIZE - info->xmit_head));
- memcpy(info->xmit_buf + info->xmit_head, tmp_buf, c);
- info->xmit_head = ((info->xmit_head + c) &
- (SERIAL_XMIT_SIZE-1));
- info->xmit_cnt += c;
- restore_flags(flags);
- buf += c;
- count -= c;
- ret += c;
- }
- up(&tmp_buf_sem);
- } else {
- while (1) {
- cli();
- c = MIN(count,
- MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
- SERIAL_XMIT_SIZE - info->xmit_head));
- if (c <= 0) {
- restore_flags(flags);
- break;
- }
- memcpy(info->xmit_buf + info->xmit_head, buf, c);
- info->xmit_head = ((info->xmit_head + c) &
- (SERIAL_XMIT_SIZE-1));
- info->xmit_cnt += c;
- restore_flags(flags);
- buf += c;
- count -= c;
- ret += c;
- }
- }
- if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped &&
- !(info->IER & VAC_UART_INT_TX_EMPTY)) {
- info->IER |= VAC_UART_INT_TX_EMPTY;
- serial_out(info, VAC_UART_INT_MASK, info->IER);
- }
- return ret;
-}
-
-static int rs_write_room(struct tty_struct *tty)
-{
- struct async_struct *info = (struct async_struct *)tty->driver_data;
- int ret;
-
- if (serial_paranoia_check(info, tty->device, "rs_write_room"))
- return 0;
- ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
- if (ret < 0)
- ret = 0;
- return ret;
-}
-
-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 info->xmit_cnt;
-}
-
-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_cnt = info->xmit_head = info->xmit_tail = 0;
- restore_flags(flags);
-
- wake_up_interruptible(&tty->write_wait);
- 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 */
- info->IER |= VAC_UART_INT_TX_EMPTY;
- serial_out(info, VAC_UART_INT_MASK, info->IER);
- }
-}
-
-/*
- * ------------------------------------------------------------
- * 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;
-
-#ifdef SERIAL_DEBUG_THROTTLE
- char buf[64];
-
- baget_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));
-}
-
-static void rs_unthrottle(struct tty_struct * tty)
-{
- struct async_struct *info = (struct async_struct *)tty->driver_data;
-#ifdef SERIAL_DEBUG_THROTTLE
- char buf[64];
-
- baget_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));
- }
-}
-
-/*
- * ------------------------------------------------------------
- * 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;
- 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;
- 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;
-
- if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
- return -EFAULT;
- state = info->state;
- old_state = *state;
-
- change_irq = new_serial.irq != state->irq;
- change_port = (new_serial.port != 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 = ((state->flags & ~ASYNC_USR_MASK) |
- (info->flags & ASYNC_USR_MASK));
- state->custom_divisor = new_serial.custom_divisor;
- goto check_and_exit;
- }
-
- new_serial.irq = new_serial.irq;
-
- if ((new_serial.irq >= NR_IRQS) || (new_serial.port > 0xffff) ||
- (new_serial.baud_base == 0) || (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[state->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_serial.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->type = new_serial.type;
- state->close_delay = new_serial.close_delay * HZ/100;
- state->closing_wait = new_serial.closing_wait * HZ/100;
- info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
- info->xmit_fifo_size = state->xmit_fifo_size =
- new_serial.xmit_fifo_size;
-
- release_region(state->port,8);
- 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_serial.port;
- info->hub6 = state->hub6 = new_serial.hub6;
- }
- if (state->type != PORT_UNKNOWN)
- 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 ((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;
- change_speed(info);
- }
- } 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 short status;
- unsigned int result;
- unsigned long flags;
-
- save_flags(flags); cli();
- status = serial_inw(info, VAC_UART_INT_STATUS);
- restore_flags(flags);
- result = ((status & VAC_UART_STATUS_TX_EMPTY) ? TIOCSER_TEMT : 0);
- return put_user(result,value);
-}
-
-
-static int get_modem_info(struct async_struct * info, unsigned int *value)
-{
- unsigned int result;
-
- result = TIOCM_CAR | TIOCM_DSR;
- return put_user(result,value);
-}
-
-static int set_modem_info(struct async_struct * info, unsigned int cmd,
- unsigned int *value)
-{
- unsigned int arg;
-
- if (get_user(arg, value))
- return -EFAULT;
- switch (cmd) {
- default:
- return -EINVAL;
- }
- return 0;
-}
-
-static int do_autoconfig(struct async_struct * info)
-{
- int retval;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- if (info->state->count > 1)
- return -EBUSY;
-
- shutdown(info);
-
- autoconfig(info->state);
-
- retval = startup(info);
- if (retval)
- return retval;
- return 0;
-}
-
-/*
- * rs_break() --- routine which turns the break handling on or off
- */
-static void rs_break(struct tty_struct *tty, int break_state)
-{
- struct async_struct * info = (struct async_struct *)tty->driver_data;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->device, "rs_break"))
- return;
-
- if (!info->port)
- return;
- save_flags(flags); cli();
- if (break_state == -1)
- serial_outp(info, VAC_UART_MODE,
- serial_inp(info, VAC_UART_MODE) | \
- VAC_UART_MODE_SEND_BREAK);
- else
- serial_outp(info, VAC_UART_MODE,
- serial_inp(info, VAC_UART_MODE) & \
- ~VAC_UART_MODE_SEND_BREAK);
- restore_flags(flags);
-}
-
-static int rs_ioctl(struct tty_struct *tty, struct file * file,
- unsigned int cmd, unsigned long arg)
-{
- int error;
- struct async_struct * info = (struct async_struct *)tty->driver_data;
- struct async_icount cprev, cnow; /* kernel counter temps */
- struct serial_icounter_struct *p_cuser; /* user space */
- unsigned long flags;
-
- 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) {
- case TIOCMGET:
- return get_modem_info(info, (unsigned int *) arg);
- case TIOCMBIS:
- case TIOCMBIC:
- case TIOCMSET:
- return set_modem_info(info, cmd, (unsigned int *) arg);
- 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);
- 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);
- p_cuser = (struct serial_icounter_struct *) arg;
- error = put_user(cnow.cts, &p_cuser->cts);
- if (error) return error;
- error = put_user(cnow.dsr, &p_cuser->dsr);
- if (error) return error;
- error = put_user(cnow.rng, &p_cuser->rng);
- if (error) return error;
- error = put_user(cnow.dcd, &p_cuser->dcd);
- if (error) return error;
- error = put_user(cnow.rx, &p_cuser->rx);
- if (error) return error;
- error = put_user(cnow.tx, &p_cuser->tx);
- if (error) return error;
- error = put_user(cnow.frame, &p_cuser->frame);
- if (error) return error;
- error = put_user(cnow.overrun, &p_cuser->overrun);
- if (error) return error;
- error = put_user(cnow.parity, &p_cuser->parity);
- if (error) return error;
- error = put_user(cnow.brk, &p_cuser->brk);
- if (error) return error;
- error = put_user(cnow.buf_overrun, &p_cuser->buf_overrun);
-
- if (error) return error;
- 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 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);
-
- /* Handle turning off CRTSCTS */
- if ((old_termios->c_cflag & CRTSCTS) &&
- !(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
- baget_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.
- */
- baget_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) {
- baget_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;
- /*
- * 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 &= ~(VAC_UART_INT_RX_BREAK_CHANGE | VAC_UART_INT_RX_ERRS);
- info->read_status_mask &= ~VAC_UART_STATUS_RX_READY;
- if (info->flags & ASYNC_INITIALIZED) {
- serial_outw(info, VAC_UART_INT_MASK, info->IER);
- /*
- * 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) {
- 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;
- restore_flags(flags);
-}
-
-/*
- * 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 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)
- char_time = MIN(char_time, timeout);
-#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
- baget_printk("In rs_wait_until_sent(%d) check=%lu...",
- timeout, char_time);
- baget_printk("jiff=%lu...", jiffies);
-#endif
- while (!((lsr = serial_inp(info, VAC_UART_INT_STATUS)) & \
- VAC_UART_STATUS_TX_EMPTY)) {
-#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
- baget_printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
-#endif
- current->state = TASK_INTERRUPTIBLE;
- schedule_timeout(char_time);
- if (signal_pending(current))
- break;
- if (timeout && time_after(jiffies, orig_jiffies + timeout))
- break;
- }
- current->state = TASK_RUNNING;
-#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
- baget_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);
- 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
- baget_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) {
- 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))
- break;
- if (signal_pending(current)) {
- retval = -ERESTARTSYS;
- break;
- }
-#ifdef SERIAL_DEBUG_OPEN
- baget_printk("block_til_ready blocking: ttys%d, count = %d\n",
- info->line, state->count);
-#endif
- schedule();
- }
- current->state = TASK_RUNNING;
- remove_wait_queue(&info->open_wait, &wait);
- if (extra_count)
- state->count++;
- info->blocked_open--;
-#ifdef SERIAL_DEBUG_OPEN
- baget_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->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; "info->tty" will cause this */
- return -ENODEV;
- }
-
-#ifdef SERIAL_DEBUG_OPEN
- baget_printk("rs_open %s%d, count = %d\n",
- tty->driver.name, info->line,
- info->state->count);
-#endif
- info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
-
- if (!tmp_buf) {
- page = get_free_page(GFP_KERNEL);
- if (!page) {
- /* MOD_DEC_USE_COUNT; "info->tty" will cause this */
- 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; "info->tty" will cause this */
-#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; "info->tty" will cause this */
- return retval;
- }
-
- retval = block_til_ready(tty, filp, info);
- if (retval) {
- /* MOD_DEC_USE_COUNT; "info->tty" will cause this */
-#ifdef SERIAL_DEBUG_OPEN
- baget_printk("rs_open returning after block_til_ready "
- "with %d\n",
- retval);
-#endif
- 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);
- }
-#ifdef CONFIG_SERIAL_CONSOLE
- if (sercons.cflag && sercons.index == line) {
- tty->termios->c_cflag = sercons.cflag;
- sercons.cflag = 0;
- change_speed(info);
- }
-#endif
- info->session = current->session;
- info->pgrp = current->pgrp;
-
-#ifdef SERIAL_DEBUG_OPEN
- baget_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;
- int ret;
-
- ret = sprintf(buf, "%d: uart:%s port:%X 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->quot = 0;
- info->tty = 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);
-
- 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\n", serial_version);
- 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);
-}
-
-/*
- * ---------------------------------------------------------------------
- * rs_init() and friends
- *
- * rs_init() is called at boot-time to initialize the serial driver.
- * ---------------------------------------------------------------------
- */
-
-/*
- * This routine prints out the appropriate serial driver version
- * number, and identifies which options were configured into this
- * driver.
- */
-static _INLINE_ void show_serial_version(void)
-{
- printk(KERN_INFO "%s version %s with", serial_name, serial_version);
-#ifdef CONFIG_SERIAL_SHARE_IRQ
- printk(" SHARE_IRQ");
-#endif
-#define SERIAL_OPT
-#ifdef CONFIG_SERIAL_DETECT_IRQ
- printk(" DETECT_IRQ");
-#endif
-#ifdef SERIAL_OPT
- printk(" enabled\n");
-#else
- printk(" no serial options enabled\n");
-#endif
-#undef SERIAL_OPT
-}
-
-
-/*
- * 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.
- */
-
-/*
- * Functionality of this function is reduced: we already know we have a VAC,
- * but still need to perform some important actions (see code :-).
- */
-static void autoconfig(struct serial_state * state)
-{
- struct async_struct *info, scr_info;
- unsigned long flags;
-
- /* Setting up important parameters */
- state->type = VAC_UART_TYPE;
- state->xmit_fifo_size = uart_config[state->type].dfl_xmit_fifo_size;
-
- info = &scr_info; /* This is just for serial_{in,out} */
-
- info->magic = SERIAL_MAGIC;
- info->port = state->port;
- info->flags = state->flags;
-
- save_flags(flags); cli();
-
- /* + Flush VAC input fifo */
- (void)serial_in(info, VAC_UART_RX);
- (void)serial_in(info, VAC_UART_RX);
- (void)serial_in(info, VAC_UART_RX);
- (void)serial_in(info, VAC_UART_RX);
-
- /* Disable interrupts */
- serial_outp(info, VAC_UART_INT_MASK, 0);
-
- restore_flags(flags);
-}
-
-int register_serial(struct serial_struct *req);
-void unregister_serial(int line);
-
-EXPORT_SYMBOL(register_serial);
-EXPORT_SYMBOL(unregister_serial);
-
-/*
- * Important function for VAC UART check and reanimation.
- */
-
-static void rs_timer(unsigned long dummy)
-{
- static unsigned long last_strobe = 0;
- struct async_struct *info;
- unsigned int i;
- unsigned long flags;
-
- if ((jiffies - last_strobe) >= RS_STROBE_TIME) {
- for (i=1; i < NR_IRQS; i++) {
- info = IRQ_ports[i];
- if (!info)
- continue;
- save_flags(flags); cli();
-#ifdef CONFIG_SERIAL_SHARE_IRQ
- if (info->next_port) {
- do {
- serial_out(info, VAC_UART_INT_MASK, 0);
- info->IER |= VAC_UART_INT_TX_EMPTY;
- serial_out(info, VAC_UART_INT_MASK,
- info->IER);
- info = info->next_port;
- } while (info);
- rs_interrupt(i, NULL, NULL);
- } else
-#endif /* CONFIG_SERIAL_SHARE_IRQ */
- rs_interrupt_single(i, NULL, NULL);
- restore_flags(flags);
- }
- }
- last_strobe = jiffies;
- mod_timer(&vacs_timer, jiffies + RS_STROBE_TIME);
-
- /*
- * It looks this code for case we share IRQ with console...
- */
-
- if (IRQ_ports[0]) {
- save_flags(flags); cli();
-#ifdef CONFIG_SERIAL_SHARE_IRQ
- rs_interrupt(0, NULL, NULL);
-#else
- rs_interrupt_single(0, NULL, NULL);
-#endif
- restore_flags(flags);
-
- mod_timer(&vacs_timer, jiffies + IRQ_timeout[0] - 2);
- }
-}
-
-/*
- * The serial driver boot-time initialization code!
- */
-int __init rs_init(void)
-{
- int i;
- struct serial_state * state;
- extern void atomwide_serial_init (void);
- extern void dualsp_serial_init (void);
-
-#ifdef CONFIG_ATOMWIDE_SERIAL
- atomwide_serial_init ();
-#endif
-#ifdef CONFIG_DUALSP_SERIAL
- dualsp_serial_init ();
-#endif
-
- init_bh(SERIAL_BH, do_serial_bh);
- init_timer(&vacs_timer);
- vacs_timer.function = rs_timer;
- vacs_timer.expires = 0;
-
- for (i = 0; i < NR_IRQS; i++) {
- IRQ_ports[i] = 0;
- IRQ_timeout[i] = 0;
- }
-
-
-/*
- * It is not a good idea to share interrupts with console,
- * but it looks we cannot avoid it.
- */
-#if 0
-
-#ifdef CONFIG_SERIAL_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
-
-#endif
- show_serial_version();
-
- /* Initialize the tty_driver structure */
-
- memset(&serial_driver, 0, sizeof(struct tty_driver));
- serial_driver.magic = TTY_DRIVER_MAGIC;
- serial_driver.driver_name = "serial";
- serial_driver.name = "ttyS";
- serial_driver.major = TTY_MAJOR;
- serial_driver.minor_start = 64;
- 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 =
- B9600 | CS8 | CREAD | HUPCL | CLOCAL;
- serial_driver.flags = TTY_DRIVER_REAL_RAW;
- 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.send_xchar = rs_send_xchar;
- serial_driver.set_termios = rs_set_termios;
- serial_driver.stop = rs_stop;
- serial_driver.start = rs_start;
- serial_driver.hangup = rs_hangup;
- serial_driver.break_ctl = rs_break;
- serial_driver.wait_until_sent = rs_wait_until_sent;
- serial_driver.read_proc = rs_read_proc;
-
- /*
- * The callout device is just like normal device except for
- * major number and the subtype code.
- */
- callout_driver = serial_driver;
- callout_driver.name = "cua";
- callout_driver.major = TTYAUX_MAJOR;
- callout_driver.subtype = SERIAL_TYPE_CALLOUT;
- callout_driver.read_proc = 0;
- callout_driver.proc_entry = 0;
-
- if (tty_register_driver(&serial_driver))
- panic("Couldn't register serial driver");
- if (tty_register_driver(&callout_driver))
- panic("Couldn't register callout driver");
-
- 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 = state->irq;
- if (check_region(state->port,8))
- continue;
- if (state->flags & ASYNC_BOOT_AUTOCONF)
- autoconfig(state);
- }
-
- /*
- * Detect the IRQ only once every port is initialised,
- * because some 16450 do not reset to 0 the MCR register.
- */
- for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
- if (state->type == PORT_UNKNOWN)
- continue;
- printk(KERN_INFO "ttyS%02d%s at 0x%04x (irq = %d) is a %s\n",
- state->line,
- (state->flags & ASYNC_FOURPORT) ? " FourPort" : "",
- state->port, state->irq,
- uart_config[state->type].name);
- }
- return 0;
-}
-
-/*
- * register_serial and unregister_serial allows for serial ports to be
- * configured at run-time, to support PCMCIA modems.
- */
-int register_serial(struct serial_struct *req)
-{
- int i;
- unsigned long flags;
- struct serial_state *state;
-
- save_flags(flags);
- cli();
- for (i = 0; i < NR_PORTS; i++) {
- if (rs_table[i].port == req->port)
- break;
- }
- if (i == NR_PORTS) {
- for (i = 0; i < NR_PORTS; i++)
- if ((rs_table[i].type == PORT_UNKNOWN) &&
- (rs_table[i].count == 0))
- break;
- }
- if (i == NR_PORTS) {
- restore_flags(flags);
- return -1;
- }
- state = &rs_table[i];
- if (rs_table[i].count) {
- restore_flags(flags);
- printk("Couldn't configure serial #%d (port=%d,irq=%d): "
- "device already open\n", i, req->port, req->irq);
- return -1;
- }
- state->irq = req->irq;
- state->port = req->port;
- state->flags = req->flags;
-
- autoconfig(state);
- if (state->type == PORT_UNKNOWN) {
- restore_flags(flags);
- printk("register_serial(): autoconfig failed\n");
- return -1;
- }
- restore_flags(flags);
-
- printk(KERN_INFO "tty%02d at 0x%04x (irq = %d) is a %s\n",
- state->line, state->port, state->irq,
- uart_config[state->type].name);
- return state->line;
-}
-
-void unregister_serial(int line)
-{
- unsigned long flags;
- struct serial_state *state = &rs_table[line];
-
- save_flags(flags);
- cli();
- if (state->info && state->info->tty)
- tty_hangup(state->info->tty);
- state->type = PORT_UNKNOWN;
- printk(KERN_INFO "tty%02d unloaded\n", state->line);
- restore_flags(flags);
-}
-
-#ifdef MODULE
-int init_module(void)
-{
- return rs_init();
-}
-
-void cleanup_module(void)
-{
- unsigned long flags;
- int e1, e2;
- int i;
-
- printk("Unloading %s: version %s\n", serial_name, serial_version);
- save_flags(flags);
- cli();
-
- del_timer_sync(&vacs_timer);
- 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 (rs_table[i].type != PORT_UNKNOWN)
- release_region(rs_table[i].port, 8);
- }
- if (tmp_buf) {
- free_page((unsigned long) tmp_buf);
- tmp_buf = NULL;
- }
-}
-#endif /* MODULE */
-
-
-/*
- * ------------------------------------------------------------
- * Serial console driver
- * ------------------------------------------------------------
- */
-#ifdef CONFIG_SERIAL_CONSOLE
-
-#define BOTH_EMPTY (VAC_UART_STATUS_TX_EMPTY | VAC_UART_STATUS_TX_EMPTY)
-
-/*
- * Wait for transmitter & holding register to empty
- */
-static inline void wait_for_xmitr(struct async_struct *info)
-{
- int lsr;
- unsigned int tmout = 1000000;
-
- do {
- lsr = serial_inp(info, VAC_UART_INT_STATUS);
- if (--tmout == 0) break;
- } while ((lsr & BOTH_EMPTY) != BOTH_EMPTY);
-}
-
-/*
- * Print a string to the serial port trying not to disturb
- * any possible real use of the port...
- */
-static void serial_console_write(struct console *co, const char *s,
- unsigned count)
-{
- struct serial_state *ser;
- int ier;
- unsigned i;
- struct async_struct scr_info; /* serial_{in,out} because HUB6 */
-
- ser = rs_table + co->index;
- scr_info.magic = SERIAL_MAGIC;
- scr_info.port = ser->port;
- scr_info.flags = ser->flags;
-
- /*
- * First save the IER then disable the interrupts
- */
- ier = serial_inp(&scr_info, VAC_UART_INT_MASK);
- serial_outw(&scr_info, VAC_UART_INT_MASK, 0x00);
-
- /*
- * Now, do each character
- */
- for (i = 0; i < count; i++, s++) {
- wait_for_xmitr(&scr_info);
-
- /*
- * Send the character out.
- * If a LF, also do CR...
- */
- serial_outp(&scr_info, VAC_UART_TX, (unsigned short)*s << 8);
- if (*s == 10) {
- wait_for_xmitr(&scr_info);
- serial_outp(&scr_info, VAC_UART_TX, 13 << 8);
- }
- }
-
- /*
- * Finally, Wait for transmitter & holding register to empty
- * and restore the IER
- */
- wait_for_xmitr(&scr_info);
- serial_outp(&scr_info, VAC_UART_INT_MASK, ier);
-}
-
-static kdev_t serial_console_device(struct console *c)
-{
- return MKDEV(TTY_MAJOR, 64 + c->index);
-}
-
-/*
- * Setup initial baud/bits/parity. 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)
-{
- struct serial_state *ser;
- unsigned cval;
- int baud = 9600;
- int bits = 8;
- int parity = 'n';
- int cflag = CREAD | HUPCL | CLOCAL;
- int quot = 0;
- char *s;
- struct async_struct scr_info; /* serial_{in,out} because HUB6 */
-
- 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';
- }
-
- /*
- * 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;
- 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
- */
- ser = rs_table + co->index;
- scr_info.magic = SERIAL_MAGIC;
- scr_info.port = ser->port;
- scr_info.flags = ser->flags;
-
- quot = ser->baud_base / baud;
- cval = cflag & (CSIZE | CSTOPB);
-
- cval >>= 4;
-
- cval &= ~VAC_UART_MODE_PARITY_ENABLE;
- if (cflag & PARENB)
- cval |= VAC_UART_MODE_PARITY_ENABLE;
- if (cflag & PARODD)
- cval |= VAC_UART_MODE_PARITY_ODD;
-
- /*
- * Disable UART interrupts, set DTR and RTS high
- * and set speed.
- */
- switch (baud) {
- default:
- case 9600:
- cval |= VAC_UART_MODE_BAUD(7);
- break;
- case 4800:
- cval |= VAC_UART_MODE_BAUD(6);
- break;
- case 2400:
- cval |= VAC_UART_MODE_BAUD(5);
- break;
- case 1200:
- cval |= VAC_UART_MODE_BAUD(4);
- break;
- case 600:
- cval |= VAC_UART_MODE_BAUD(3);
- break;
- case 300:
- cval |= VAC_UART_MODE_BAUD(2);
- break;
-#ifndef QUAD_UART_SPEED
- case 150:
-#else
- case 38400:
-#endif
- cval |= VAC_UART_MODE_BAUD(1);
- break;
-#ifndef QUAD_UART_SPEED
- case 75:
-#else
- case 19200:
-#endif
- cval |= VAC_UART_MODE_BAUD(0);
- break;
- }
-
- /* Baget VAC need some adjustments for computed value */
- cval = vac_uart_mode_fixup(cval);
-
- serial_outp(&scr_info, VAC_UART_MODE, cval);
- serial_outp(&scr_info, VAC_UART_INT_MASK, 0);
-
- return 0;
-}
-
-static struct console sercons = {
- name: "ttyS",
- write: serial_console_write,
- device: serial_console_device,
- setup: serial_console_setup,
- flags: CON_PRINTBUFFER,
- index: -1,
-};
-
-/*
- * Register console.
- */
-long __init serial_console_init(long kmem_start, long kmem_end)
-{
- register_console(&sercons);
- return kmem_start;
-}
-#endif
-
-#ifdef CONFIG_REMOTE_DEBUG
-#undef PRINT_DEBUG_PORT_INFO
-
-/*
- * This is the interface to the remote debugger stub.
- * I've put that here to be able to control the serial
- * device more directly.
- */
-
-static int initialized;
-
-static int rs_debug_init(struct async_struct *info)
-{
- int quot;
-
- autoconfig(info); /* autoconfigure ttyS0, whatever that is */
-
-#ifdef PRINT_DEBUG_PORT_INFO
- baget_printk("kgdb debug interface:: tty%02d at 0x%04x",
- info->line, info->port);
- switch (info->type) {
- case PORT_8250:
- baget_printk(" is a 8250\n");
- break;
- case PORT_16450:
- baget_printk(" is a 16450\n");
- break;
- case PORT_16550:
- baget_printk(" is a 16550\n");
- break;
- case PORT_16550A:
- baget_printk(" is a 16550A\n");
- break;
- case PORT_16650:
- baget_printk(" is a 16650\n");
- break;
- default:
- baget_printk(" is of unknown type -- unusable\n");
- break;
- }
-#endif
-
- if (info->port == PORT_UNKNOWN)
- return -1;
-
- /*
- * Clear all interrupts
- */
-
- (void)serial_inp(info, VAC_UART_INT_STATUS);
- (void)serial_inp(info, VAC_UART_RX);
-
- /*
- * Now, initialize the UART
- */
- serial_outp(info,VAC_UART_MODE,VAC_UART_MODE_INITIAL); /* reset DLAB */
- if (info->flags & ASYNC_FOURPORT) {
- info->MCR = UART_MCR_DTR | UART_MCR_RTS;
- info->MCR_noint = UART_MCR_DTR | UART_MCR_OUT1;
- } else {
- info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
- info->MCR_noint = UART_MCR_DTR | UART_MCR_RTS;
- }
-
- info->MCR = info->MCR_noint; /* no interrupts, please */
- /*
- * and set the speed of the serial port
- * (currently hardwired to 9600 8N1
- */
-
- quot = info->baud_base / 9600; /* baud rate is fixed to 9600 */
- /* FIXME: if rs_debug interface is needed, we need to set speed here */
-
- return 0;
-}
-
-int putDebugChar(char c)
-{
- struct async_struct *info = rs_table;
-
- if (!initialized) { /* need to init device first */
- if (rs_debug_init(info) == 0)
- initialized = 1;
- else
- return 0;
- }
-
- while ((serial_inw(info, VAC_UART_INT_STATUS) & \
- VAC_UART_STATUS_TX_EMPTY) == 0)
- ;
- serial_out(info, VAC_UART_TX, (unsigned short)c << 8);
-
- return 1;
-}
-
-char getDebugChar(void)
-{
- struct async_struct *info = rs_table;
-
- if (!initialized) { /* need to init device first */
- if (rs_debug_init(info) == 0)
- initialized = 1;
- else
- return 0;
- }
- while (!(serial_inw(info, VAC_UART_INT_STATUS) & \
- VAC_UART_STATUS_RX_READY))
- ;
-
- return(serial_inp(info, VAC_UART_RX));
-}
-
-#endif /* CONFIG_REMOTE_DEBUG */
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)