patch-2.1.127 linux/drivers/sbus/char/su32.c
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- Lines: 3566
- Date:
Wed Dec 31 16:00:00 1969
- Orig file:
v2.1.126/linux/drivers/sbus/char/su32.c
- Orig date:
Mon Oct 5 13:13:40 1998
diff -u --recursive --new-file v2.1.126/linux/drivers/sbus/char/su32.c linux/drivers/sbus/char/su32.c
@@ -1,3565 +0,0 @@
-/* $Id: su32.c,v 1.1 1998/09/18 10:45:32 jj Exp $
- * su.c: Small serial driver for keyboard/mouse interface on sparc32/PCI
- *
- * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
- * Coypright (C) 1998 Pete Zaitcev (zaitcev@metabyte.com)
- *
- * This is mainly a variation of drivers/char/serial.c,
- * credits go to authors mentioned therein.
- */
-
-/*
- * Configuration section.
- */
-#define SERIAL_PARANOIA_CHECK
-#define CONFIG_SERIAL_NOPAUSE_IO /* Unused on sparc */
-#define SERIAL_DO_RESTART
-
-#if 1
-/* Normally these defines are controlled by the autoconf.h */
-
-#undef CONFIG_SERIAL_MANY_PORTS
-#define CONFIG_SERIAL_SHARE_IRQ /* Must be enabled for MrCoffee. */
-#undef CONFIG_SERIAL_DETECT_IRQ /* code is removed from su.c */
-#undef CONFIG_SERIAL_MULTIPORT
-#endif
-
-/* Sanity checks */
-
-#ifdef CONFIG_SERIAL_MULTIPORT
-#ifndef CONFIG_SERIAL_SHARE_IRQ
-#define CONFIG_SERIAL_SHARE_IRQ
-#endif
-#endif
-
-/* 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_THROTTLE
-
-/* */
-
-#define RS_STROBE_TIME (10*HZ)
-#define RS_ISR_PASS_LIMIT 256
-
-#ifdef __sparc_v9__
-#define IRQ_4M(n) (n)
-#define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? SA_SHIRQ : SA_INTERRUPT)
-#else
-/* 0x20 is sun4m thing, Dave Redman heritage. See arch/sparc/kernel/irq.c. */
-#define IRQ_4M(n) ((n)|0x20)
-/* Interrupts must be shared on MrCoffee. */
-#define IRQ_T(info) SA_SHIRQ
-#endif
-
-#define SERIAL_INLINE
-
-#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
-
-/*
- * 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/serial_reg.h>
-#include <linux/string.h>
-#include <linux/fcntl.h>
-#include <linux/ptrace.h>
-#include <linux/ioport.h>
-#include <linux/mm.h>
-#include <linux/malloc.h>
-#include <linux/init.h>
-#include <linux/delay.h>
-#ifdef CONFIG_SERIAL_CONSOLE
-#include <linux/console.h>
-#include <linux/major.h>
-#endif
-#include <linux/sysrq.h>
-
-#include <asm/system.h>
-#include <asm/oplib.h>
-#include <asm/io.h>
-#include <asm/ebus.h>
-#include <asm/irq.h>
-#include <asm/uaccess.h>
-#include <asm/bitops.h>
-#if 0 /* P3: Needed if we to support /sbin/setserial. */
-#include <asm/serial.h>
-#endif
-
-#include "sunserial.h"
-#include "sunkbd.h"
-#include "sunmouse.h"
-
-/* We are on a NS PC87303 clocked with 24.0 MHz, which results
- * in a UART clock of 1.8462 MHz.
- */
-#define BAUD_BASE (1846200 / 16)
-
-#ifdef CONFIG_SERIAL_CONSOLE
-extern int serial_console;
-static struct console sercons;
-int su_serial_console_init(void);
-#endif
-
-/*
- * serial.c saves memory when it allocates async_info upon first open.
- * We have parts of state structure together because we do call startup
- * for keyboard and mouse.
- */
-struct su_struct {
- int magic;
- unsigned long port;
- int baud_base;
- int type; /* Hardware type: e.g. 16550 */
- int irq;
- int flags;
- int line;
- int cflag;
-
- /* XXX Unify. */
- int kbd_node;
- int ms_node;
- int port_node;
-
- char name[16];
-
- int xmit_fifo_size;
- int custom_divisor;
- unsigned short close_delay;
- unsigned short closing_wait; /* time to wait before closing */
- unsigned short closing_wait2; /* no longer used... */
-
- struct tty_struct *tty;
- int read_status_mask;
- int ignore_status_mask;
- int timeout;
- int quot;
- int x_char; /* xon/xoff character */
- int IER; /* Interrupt Enable Register */
- int MCR; /* Modem control register */
- unsigned long event;
- int blocked_open; /* # of blocked opens */
- long session; /* Session of opening process */
- long pgrp; /* pgrp of opening process */
- unsigned char *xmit_buf;
- int xmit_head;
- int xmit_tail;
- int xmit_cnt;
- struct tq_struct tqueue;
- struct wait_queue *open_wait;
- struct wait_queue *close_wait;
- struct wait_queue *delta_msr_wait;
-
- struct su_struct *next_port;
- struct su_struct *prev_port;
-
- int count;
- struct async_icount icount;
- struct termios normal_termios, callout_termios;
- unsigned long last_active; /* For async_struct, to be */
-};
-
-#if 0 /* P3: became unused after surgery. */
-/*
- * This is used to figure out the divisor speeds and the timeouts
- */
-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
-
-#ifdef SERIAL_INLINE
-#define _INLINE_ inline
-#endif
-
-static char *serial_name = "Serial driver";
-static char *serial_version = "4.25.s1";
-
-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 su_struct *IRQ_ports[NR_IRQS];
-#ifdef CONFIG_SERIAL_MULTIPORT
-static struct rs_multiport_struct rs_multiport[NR_IRQS];
-#endif
-static int IRQ_timeout[NR_IRQS];
-
-static void autoconfig(struct su_struct *info);
-static void change_speed(struct su_struct *info);
-static void su_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 },
- { "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},
- { 0, 0}
-};
-
-
-#define NR_PORTS 4
-
-static struct su_struct su_table[NR_PORTS];
-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 struct semaphore tmp_buf_sem = MUTEX;
-
-static inline int serial_paranoia_check(struct su_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 su_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;
-}
-
-#ifdef __sparc_v9__
-
-static inline
-unsigned int su_inb(struct su_struct *info, unsigned long offset)
-{
- return inb(info->port + offset);
-}
-
-static inline void
-su_outb(struct su_struct *info, unsigned long offset, int value)
-{
- outb(value, info->port + offset);
-}
-
-#else
-
-static inline
-unsigned int su_inb(struct su_struct *info, unsigned long offset)
-{
- return (unsigned int)(*(volatile unsigned char *)(info->port + offset));
-}
-
-static inline void
-su_outb(struct su_struct *info, unsigned long offset, int value)
-{
- /*
- * MrCoffee has weird schematics: IRQ4 & P10(?) pins of SuperIO are
- * connected with a gate then go to SlavIO. When IRQ4 goes tristated
- * gate gives logical one. Since we use level triggered interrupts
- * we have lockup and watchdog reset. We cannot mask IRQ because
- * keyboard shares IRQ with us (Bob Smelik: I would not hire you).
- * P3: Assure that OUT2 never goes down.
- */
- if (offset == UART_MCR) value |= UART_MCR_OUT2;
- *(volatile unsigned char *)(info->port + offset) = value;
-}
-
-#endif
-
-#define serial_in(info, off) su_inb(info, off)
-#define serial_inp(info, off) su_inb(info, off)
-#define serial_out(info, off, val) su_outb(info, off, val)
-#define serial_outp(info, off, val) su_outb(info, off, val)
-
-/*
- * ------------------------------------------------------------
- * su_stop() and su_start()
- *
- * This routines are called before setting or resetting tty->stopped.
- * They enable or disable transmitter interrupts, as necessary.
- * ------------------------------------------------------------
- */
-static void su_stop(struct tty_struct *tty)
-{
- struct su_struct *info = (struct su_struct *)tty->driver_data;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->device, "su_stop"))
- return;
-
- save_flags(flags); cli();
- if (info->IER & UART_IER_THRI) {
- info->IER &= ~UART_IER_THRI;
- serial_out(info, UART_IER, info->IER);
- }
- restore_flags(flags);
-}
-
-static void su_start(struct tty_struct *tty)
-{
- struct su_struct *info = (struct su_struct *)tty->driver_data;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->device, "su_start"))
- return;
-
- save_flags(flags); cli();
- if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) {
- info->IER |= UART_IER_THRI;
- serial_out(info, UART_IER, info->IER);
- }
- restore_flags(flags);
-}
-
-/*
- * ----------------------------------------------------------------------
- *
- * Here starts the interrupt handling routines. All of the following
- * subroutines are declared as inline and are folded into
- * su_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 su_sched_event(struct su_struct *info, int event)
-{
- info->event |= 1 << event;
- queue_task(&info->tqueue, &tq_serial);
- mark_bh(SERIAL_BH);
-}
-
-static _INLINE_ void receive_chars(struct su_struct *info, int *status,
- struct pt_regs *regs)
-{
- struct tty_struct *tty = info->tty;
- unsigned char ch;
- int ignored = 0;
- struct async_icount *icount;
-
- icount = &info->icount;
- do {
- ch = serial_inp(info, UART_RX);
- if (info->kbd_node) {
- if(ch == SUNKBD_RESET) {
- l1a_state.kbd_id = 1;
- l1a_state.l1_down = 0;
- } else if(l1a_state.kbd_id) {
- l1a_state.kbd_id = 0;
- } else if(ch == SUNKBD_L1) {
- l1a_state.l1_down = 1;
- } else if(ch == (SUNKBD_L1|SUNKBD_UP)) {
- l1a_state.l1_down = 0;
- } else if(ch == SUNKBD_A && l1a_state.l1_down) {
- /* whee... */
- batten_down_hatches();
- /* Continue execution... */
- l1a_state.l1_down = 0;
- l1a_state.kbd_id = 0;
- return;
- }
- sunkbd_inchar(ch, regs);
- } else {
- sun_mouse_inbyte(ch);
- }
- if (tty->flip.count >= TTY_FLIPBUF_SIZE)
- break;
- *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++;
- } else if (*status & UART_LSR_PE)
- icount->parity++;
- else if (*status & UART_LSR_FE)
- icount->frame++;
- if (*status & UART_LSR_OE)
- 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 & (UART_LSR_BI)) {
-#ifdef SERIAL_DEBUG_INTR
- printk("handling break....");
-#endif
- *tty->flip.flag_buf_ptr = TTY_BREAK;
- if (info->flags & ASYNC_SAK)
- do_SAK(tty);
- } 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 (*status & UART_LSR_OE) {
- /*
- * 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_inp(info, UART_LSR);
- } while (*status & UART_LSR_DR);
- tty_flip_buffer_push(tty);
-}
-
-static _INLINE_ void transmit_chars(struct su_struct *info, int *intr_done)
-{
- int count;
-
- if (info->x_char) {
- serial_outp(info, UART_TX, info->x_char);
- info->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 &= ~UART_IER_THRI;
- serial_out(info, UART_IER, info->IER);
- return;
- }
-
- count = info->xmit_fifo_size;
- do {
- serial_out(info, UART_TX, info->xmit_buf[info->xmit_tail++]);
- info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
- info->icount.tx++;
- if (--info->xmit_cnt <= 0)
- break;
- } while (--count > 0);
-
- if (info->xmit_cnt < WAKEUP_CHARS)
- su_sched_event(info, RS_EVENT_WRITE_WAKEUP);
-
-#ifdef SERIAL_DEBUG_INTR
- printk("THRE...");
-#endif
- if (intr_done)
- *intr_done = 0;
-
- if (info->xmit_cnt <= 0) {
- info->IER &= ~UART_IER_THRI;
- serial_out(info, UART_IER, info->IER);
- }
-}
-
-static _INLINE_ void check_modem_status(struct su_struct *info)
-{
- int status;
- struct async_icount *icount;
-
- status = serial_in(info, UART_MSR);
-
- if (status & UART_MSR_ANY_DELTA) {
- icount = &info->icount;
- /* update input line counters */
- if (status & UART_MSR_TERI)
- icount->rng++;
- if (status & UART_MSR_DDSR)
- icount->dsr++;
- if (status & UART_MSR_DDCD) {
- icount->dcd++;
-#ifdef CONFIG_HARD_PPS
- if ((info->flags & ASYNC_HARDPPS_CD) &&
- (status & UART_MSR_DCD))
- hardpps();
-#endif
- }
- if (status & UART_MSR_DCTS)
- icount->cts++;
- wake_up_interruptible(&info->delta_msr_wait);
- }
-
- if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
-#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
- printk("ttys%d CD now %s...", info->line,
- (status & UART_MSR_DCD) ? "on" : "off");
-#endif
- if (status & UART_MSR_DCD)
- wake_up_interruptible(&info->open_wait);
- else if (!((info->flags & ASYNC_CALLOUT_ACTIVE) &&
- (info->flags & ASYNC_CALLOUT_NOHUP))) {
-#ifdef SERIAL_DEBUG_OPEN
- printk("doing serial hangup...");
-#endif
- if (info->tty)
- tty_hangup(info->tty);
- }
- }
- if (info->flags & ASYNC_CTS_FLOW) {
- if (info->tty->hw_stopped) {
- if (status & UART_MSR_CTS) {
-#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
- printk("CTS tx start...");
-#endif
- info->tty->hw_stopped = 0;
- info->IER |= UART_IER_THRI;
- serial_out(info, UART_IER, info->IER);
- su_sched_event(info, RS_EVENT_WRITE_WAKEUP);
- return;
- }
- } else {
- if (!(status & UART_MSR_CTS)) {
-#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
- printk("CTS tx stop...");
-#endif
- info->tty->hw_stopped = 1;
- info->IER &= ~UART_IER_THRI;
- serial_out(info, UART_IER, info->IER);
- }
- }
- }
-}
-
-#ifdef CONFIG_SERIAL_SHARE_IRQ
-/*
- * This is the serial driver's generic interrupt routine
- */
-static void su_interrupt(int irq, void *dev_id, struct pt_regs * regs)
-{
- int status;
- struct su_struct *info;
- int pass_counter = 0;
- struct su_struct *end_mark = 0;
-#ifdef CONFIG_SERIAL_MULTIPORT
- int first_multi = 0;
- struct su_multiport_struct *multi;
-#endif
-
-#ifdef SERIAL_DEBUG_INTR
- printk("su_interrupt(%s)...", __irq_itoa(irq));
-#endif
-
- info = IRQ_ports[irq];
- if (!info)
- return;
-
-#ifdef CONFIG_SERIAL_MULTIPORT
- multi = &rs_multiport[irq];
- if (multi->port_monitor)
- first_multi = inb(multi->port_monitor);
-#endif
-
- do {
- if (!info->tty ||
- (serial_in(info, UART_IIR) & UART_IIR_NO_INT)) {
- if (!end_mark)
- end_mark = info;
- goto next;
- }
- end_mark = 0;
-
- info->last_active = jiffies;
-
- status = serial_inp(info, UART_LSR);
-#ifdef SERIAL_DEBUG_INTR
- printk("status = %x...", status);
-#endif
- if (status & UART_LSR_DR)
- receive_chars(info, &status, regs);
- check_modem_status(info);
- if (status & UART_LSR_THRE)
- transmit_chars(info, 0);
-
- next:
- info = info->next_port;
- if (!info) {
- info = IRQ_ports[irq];
- if (pass_counter++ > RS_ISR_PASS_LIMIT) {
-#if 0
- printk("rs loop break\n");
-#endif
- break; /* Prevent infinite loops */
- }
- continue;
- }
- } while (end_mark != info);
-#ifdef CONFIG_SERIAL_MULTIPORT
- if (multi->port_monitor)
- printk("rs port monitor (normal) irq %d: 0x%x, 0x%x\n",
- info->irq, first_multi,
- inb(multi->port_monitor));
-#endif
-#ifdef SERIAL_DEBUG_INTR
- printk("end.\n");
-#endif
-}
-#endif /* #ifdef CONFIG_SERIAL_SHARE_IRQ */
-
-
-/*
- * This is the serial driver's interrupt routine for a single port
- */
-static void su_interrupt_single(int irq, void *dev_id, struct pt_regs * regs)
-{
- int status;
- int pass_counter = 0;
- struct su_struct * info;
-#ifdef CONFIG_SERIAL_MULTIPORT
- int first_multi = 0;
- struct rs_multiport_struct *multi;
-#endif
-
-#ifdef SERIAL_DEBUG_INTR
- printk("su_interrupt_single(%d) int=%x ...", irq,
- serial_inp(&su_table[0], UART_IIR));
-#endif
-
- info = IRQ_ports[irq];
- if (!info || !info->tty)
- return;
-
-#ifdef CONFIG_SERIAL_MULTIPORT
- multi = &rs_multiport[irq];
- if (multi->port_monitor)
- first_multi = inb(multi->port_monitor);
-#endif
-
- do {
- status = serial_inp(info, UART_LSR);
-#ifdef SERIAL_DEBUG_INTR
- printk("status = %x...", status);
-#endif
- if (status & UART_LSR_DR)
- receive_chars(info, &status, regs);
- check_modem_status(info);
- if (status & UART_LSR_THRE)
- transmit_chars(info, 0);
- if (pass_counter++ > RS_ISR_PASS_LIMIT) {
-#if 0
- printk("su_single loop break.\n");
-#endif
- break;
- }
- } while (!(serial_in(info, UART_IIR) & UART_IIR_NO_INT));
- info->last_active = jiffies;
-#ifdef CONFIG_SERIAL_MULTIPORT
- if (multi->port_monitor)
- printk("rs port monitor (single) irq %s: 0x%x, 0x%x\n",
- __irq_itoa(info->irq), first_multi,
- inb(multi->port_monitor));
-#endif
-#ifdef SERIAL_DEBUG_INTR
- printk("end.\n");
-#endif
-}
-
-#ifdef CONFIG_SERIAL_MULTIPORT
-/*
- * This is the serial driver's for multiport boards
- */
-static void su_interrupt_multi(int irq, void *dev_id, struct pt_regs * regs)
-{
- int status;
- struct su_struct * info;
- int pass_counter = 0;
- int first_multi= 0;
- struct rs_multiport_struct *multi;
-
-#ifdef SERIAL_DEBUG_INTR
- printk("rs_interrupt_multi(%d)...", irq);
-#endif
-
- info = IRQ_ports[irq];
- if (!info)
- return;
- multi = &rs_multiport[irq];
- if (!multi->port1) {
- /* Should never happen */
- printk("rs_interrupt_multi: NULL port1!\n");
- return;
- }
- if (multi->port_monitor)
- first_multi = inb(multi->port_monitor);
-
- while (1) {
- if (!info->tty ||
- (serial_in(info, UART_IIR) & UART_IIR_NO_INT))
- goto next;
-
- info->last_active = jiffies;
-
- status = serial_inp(info, UART_LSR);
-#ifdef SERIAL_DEBUG_INTR
- printk("status = %x...", status);
-#endif
- if (status & UART_LSR_DR)
- receive_chars(info, &status, regs);
- check_modem_status(info);
- if (status & UART_LSR_THRE)
- transmit_chars(info, 0);
-
- next:
- info = info->next_port;
- if (info)
- continue;
-
- info = IRQ_ports[irq];
- if (pass_counter++ > RS_ISR_PASS_LIMIT) {
-#if 1
- printk("rs_multi loop break\n");
-#endif
- break; /* Prevent infinite loops */
- }
- if (multi->port_monitor)
- printk("rs port monitor irq %d: 0x%x, 0x%x\n",
- info->irq, first_multi,
- inb(multi->port_monitor));
- if ((inb(multi->port1) & multi->mask1) != multi->match1)
- continue;
- if (!multi->port2)
- break;
- if ((inb(multi->port2) & multi->mask2) != multi->match2)
- continue;
- if (!multi->port3)
- break;
- if ((inb(multi->port3) & multi->mask3) != multi->match3)
- continue;
- if (!multi->port4)
- break;
- if ((inb(multi->port4) & multi->mask4) == multi->match4)
- continue;
- break;
- }
-#ifdef SERIAL_DEBUG_INTR
- printk("end.\n");
-#endif
-}
-#endif
-
-/*
- * -------------------------------------------------------------------
- * 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
- * su_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 su_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 su_struct *info = (struct su_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);
- }
-}
-
-/*
- * 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 su_timer(void)
-{
- static unsigned long last_strobe = 0;
- struct su_struct *info;
- unsigned int i;
-
- if ((jiffies - last_strobe) >= RS_STROBE_TIME) {
- for (i=1; i < NR_IRQS; i++) {
- info = IRQ_ports[i];
- if (!info)
- continue;
- cli();
-#ifdef CONFIG_SERIAL_SHARE_IRQ
- if (info->next_port) {
- do {
- serial_out(info, UART_IER, 0);
- info->IER |= UART_IER_THRI;
- serial_out(info, UART_IER, info->IER);
- info = info->next_port;
- } while (info);
-#ifdef CONFIG_SERIAL_MULTIPORT
- if (rs_multiport[i].port1)
- rs_interrupt_multi(i, NULL, NULL);
- else
-#endif
- su_interrupt(i, NULL, NULL);
- } else
-#endif /* CONFIG_SERIAL_SHARE_IRQ */
- su_interrupt_single(i, NULL, NULL);
- sti();
- }
- }
- last_strobe = jiffies;
- timer_table[RS_TIMER].expires = jiffies + RS_STROBE_TIME;
- timer_active |= 1 << RS_TIMER;
-
- if (IRQ_ports[0]) {
- cli();
-#ifdef CONFIG_SERIAL_SHARE_IRQ
- su_interrupt(0, NULL, NULL);
-#else
- su_interrupt_single(0, NULL, NULL);
-#endif
- sti();
-
- timer_table[RS_TIMER].expires = jiffies + IRQ_timeout[0] - 2;
- }
-}
-
-/*
- * ---------------------------------------------------------------
- * 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 su_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 su_struct *info)
-{
- unsigned long flags;
- int retval=0;
- void (*handler)(int, void *, struct pt_regs *);
- unsigned long page;
-#ifdef CONFIG_SERIAL_MANY_PORTS
- unsigned short ICP;
-#endif
-
- 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 (info->port == 0 || info->type == PORT_UNKNOWN) {
- 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;
-
- if (uart_config[info->type].flags & UART_STARTECH) {
- /* Wake up UART */
- serial_outp(info, UART_LCR, 0xBF);
- serial_outp(info, UART_EFR, UART_EFR_ECB);
- serial_outp(info, UART_IER, 0);
- serial_outp(info, UART_EFR, 0);
- serial_outp(info, UART_LCR, 0);
- }
-
- if (info->type == PORT_16750) {
- /* Wake up UART */
- serial_outp(info, UART_IER, 0);
- }
-
- /*
- * Clear the FIFO buffers and disable them
- * (they will be reenabled in change_speed())
- */
- if (uart_config[info->type].flags & UART_CLEAR_FIFO)
- serial_outp(info, UART_FCR, (UART_FCR_CLEAR_RCVR |
- UART_FCR_CLEAR_XMIT));
-
- /*
- * At this point there's no way the LSR could still be 0xFF;
- * if it is, then bail out, because there's likely no UART
- * here.
- */
- if (serial_inp(info, UART_LSR) == 0xff) {
- if (capable(CAP_SYS_ADMIN)) {
- if (info->tty)
- set_bit(TTY_IO_ERROR, &info->tty->flags);
- } else
- retval = -ENODEV;
- goto errout;
- }
-
- /*
- * Allocate the IRQ if necessary
- */
- if (info->irq && (!IRQ_ports[info->irq] ||
- !IRQ_ports[info->irq]->next_port)) {
- if (IRQ_ports[info->irq]) {
-#ifdef CONFIG_SERIAL_SHARE_IRQ
- free_irq(IRQ_4M(info->irq), info);
-#ifdef CONFIG_SERIAL_MULTIPORT
- if (rs_multiport[info->irq].port1)
- handler = rs_interrupt_multi;
- else
-#endif
- handler = su_interrupt;
-#else
- retval = -EBUSY;
- goto errout;
-#endif /* CONFIG_SERIAL_SHARE_IRQ */
- } else
- handler = su_interrupt_single;
-
- retval = request_irq(IRQ_4M(info->irq), handler, IRQ_T(info),
- "serial", info);
- 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[info->irq];
- if (info->next_port)
- info->next_port->prev_port = info;
- IRQ_ports[info->irq] = info;
- figure_IRQ_timeout(info->irq);
-
- /*
- * Clear the interrupt registers.
- */
- /* (void) serial_inp(info, UART_LSR); */ /* (see above) */
- (void) serial_inp(info, UART_RX);
- (void) serial_inp(info, UART_IIR);
- (void) serial_inp(info, UART_MSR);
-
- /*
- * 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;
-#ifdef CONFIG_SERIAL_MANY_PORTS
- if (info->flags & ASYNC_FOURPORT) {
- if (info->irq == 0)
- info->MCR |= UART_MCR_OUT1;
- } else
-#endif
- {
- if (info->irq != 0)
- info->MCR |= UART_MCR_OUT2;
- }
-#if defined(__alpha__) && !defined(CONFIG_PCI)
- /*
- * DEC did something gratutiously wrong....
- */
- info->MCR |= UART_MCR_OUT1 | UART_MCR_OUT2;
-#endif
- serial_outp(info, UART_MCR, info->MCR);
-
- /*
- * Finally, enable interrupts
- */
- info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
- serial_outp(info, UART_IER, info->IER); /* enable interrupts */
-
-#ifdef CONFIG_SERIAL_MANY_PORTS
- if (info->flags & ASYNC_FOURPORT) {
- /* Enable interrupts on the AST Fourport board */
- ICP = (info->port & 0xFE0) | 0x01F;
- outb_p(0x80, ICP);
- (void) inb_p(ICP);
- }
-#endif
-
- /*
- * And clear the interrupt registers again for luck.
- */
- (void)serial_inp(info, UART_LSR);
- (void)serial_inp(info, UART_RX);
- (void)serial_inp(info, UART_IIR);
- (void)serial_inp(info, UART_MSR);
-
- 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...
- */
- timer_table[RS_TIMER].expires = jiffies + 2*HZ/100;
- timer_active |= 1 << RS_TIMER;
-
- /*
- * Set up the tty->alt_speed kludge
- */
- 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;
- }
-
- /*
- * 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 su_struct *info)
-{
- unsigned long flags;
- int retval;
-
- if (!(info->flags & ASYNC_INITIALIZED))
- return;
-
- 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[info->irq] = info->next_port;
- figure_IRQ_timeout(info->irq);
-
- /*
- * Free the IRQ, if necessary
- */
- if (info->irq && (!IRQ_ports[info->irq] ||
- !IRQ_ports[info->irq]->next_port)) {
- if (IRQ_ports[info->irq]) {
- free_irq(IRQ_4M(info->irq), info);
- retval = request_irq(IRQ_4M(info->irq),
- su_interrupt_single, IRQ_T(info), "serial", info);
-
- if (retval)
- printk("serial shutdown: request_irq: error %d"
- " Couldn't reacquire IRQ.\n", retval);
- } else
- free_irq(IRQ_4M(info->irq), info);
- }
-
- if (info->xmit_buf) {
- free_page((unsigned long) info->xmit_buf);
- info->xmit_buf = 0;
- }
-
- info->IER = 0;
- serial_outp(info, UART_IER, 0x00); /* disable all intrs */
-#ifdef CONFIG_SERIAL_MANY_PORTS
- if (info->flags & ASYNC_FOURPORT) {
- /* reset interrupts on the AST Fourport board */
- (void) inb((info->port & 0xFE0) | 0x01F);
- info->MCR |= UART_MCR_OUT1;
- } else
-#endif
- info->MCR &= ~UART_MCR_OUT2;
-#if defined(__alpha__) && !defined(CONFIG_PCI)
- /*
- * DEC did something gratutiously wrong....
- */
- info->MCR |= UART_MCR_OUT1 | UART_MCR_OUT2;
-#endif
-
- /* disable break condition */
- serial_out(info, UART_LCR, serial_inp(info, UART_LCR) & ~UART_LCR_SBC);
-
- if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
- info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
- serial_outp(info, UART_MCR, info->MCR);
-
- /* disable FIFO's */
- serial_outp(info, UART_FCR, (UART_FCR_CLEAR_RCVR |
- UART_FCR_CLEAR_XMIT));
- (void)serial_in(info, UART_RX); /* read data port to reset things */
-
- if (info->tty)
- set_bit(TTY_IO_ERROR, &info->tty->flags);
-
- if (uart_config[info->type].flags & UART_STARTECH) {
- /* Arrange to enter sleep mode */
- serial_outp(info, UART_LCR, 0xBF);
- serial_outp(info, UART_EFR, UART_EFR_ECB);
- serial_outp(info, UART_IER, UART_IERX_SLEEP);
- serial_outp(info, UART_LCR, 0);
- }
- if (info->type == PORT_16750) {
- /* Arrange to enter sleep mode */
- serial_outp(info, UART_IER, UART_IERX_SLEEP);
- }
- info->flags &= ~ASYNC_INITIALIZED;
- restore_flags(flags);
-}
-
-/*
- * 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 su_struct *info)
-{
- unsigned short port;
- int quot = 0, baud_base, baud;
- unsigned cflag, cval, fcr = 0;
- 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 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) {
- cval |= UART_LCR_PARITY;
- bits++;
- }
- if (!(cflag & PARODD))
- cval |= UART_LCR_EPAR;
-#ifdef CMSPAR
- if (cflag & CMSPAR)
- cval |= UART_LCR_SPAR;
-#endif
-
- /* Determine divisor based on baud rate */
- baud = tty_get_baud_rate(info->tty);
- baud_base = info->baud_base;
- if (baud == 38400 &&
- ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
- quot = info->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 */
-
- /* Set up FIFO's */
- if (uart_config[info->type].flags & UART_USE_FIFO) {
- if ((info->baud_base / quot) < 2400)
- fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
- else
- fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8;
- }
- if (info->type == PORT_16750)
- fcr |= UART_FCR7_64BYTE;
-
- /* CTS flow control flag and modem status interrupts */
- info->IER &= ~UART_IER_MSI;
- if (info->flags & ASYNC_HARDPPS_CD)
- info->IER |= UART_IER_MSI;
- if (cflag & CRTSCTS) {
- info->flags |= ASYNC_CTS_FLOW;
- info->IER |= UART_IER_MSI;
- } else
- info->flags &= ~ASYNC_CTS_FLOW;
- if (cflag & CLOCAL)
- info->flags &= ~ASYNC_CHECK_CD;
- else {
- info->flags |= ASYNC_CHECK_CD;
- info->IER |= UART_IER_MSI;
- }
- serial_out(info, UART_IER, info->IER);
-
- /*
- * 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;
- }
- /*
- * !!! ignore all characters if CREAD is not set
- */
- if ((cflag & CREAD) == 0)
- info->ignore_status_mask |= UART_LSR_DR;
- save_flags(flags); cli();
- if (uart_config[info->type].flags & UART_STARTECH) {
- serial_outp(info, UART_LCR, 0xBF);
- serial_outp(info, UART_EFR,
- (cflag & CRTSCTS) ? UART_EFR_CTS : 0);
- }
- serial_outp(info, UART_LCR, cval | UART_LCR_DLAB); /* set DLAB */
- serial_outp(info, UART_DLL, quot & 0xff); /* LS of divisor */
- serial_outp(info, UART_DLM, quot >> 8); /* MS of divisor */
- if (info->type == PORT_16750)
- serial_outp(info, UART_FCR, fcr); /* set fcr */
- serial_outp(info, UART_LCR, cval); /* reset DLAB */
- if (info->type != PORT_16750)
- serial_outp(info, UART_FCR, fcr); /* set fcr */
- restore_flags(flags);
- info->quot = quot;
-}
-
-static void su_put_char(struct tty_struct *tty, unsigned char ch)
-{
- struct su_struct *info = (struct su_struct *)tty->driver_data;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->device, "su_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 su_put_char_kbd(unsigned char c)
-{
- struct su_struct *info;
- int i;
- int lsr;
-
- for (i = 0, info = su_table; i < NR_PORTS; i++, info++) {
- if (info->kbd_node != 0)
- break;
- }
- if (i >= NR_PORTS) {
- /* XXX P3: I would put a printk here but it may flood. */
- return;
- }
-
- do {
- lsr = serial_in(info, UART_LSR);
- } while (!(lsr & UART_LSR_THRE));
-
- /* Send the character out. */
- su_outb(info, UART_TX, c);
-}
-
-static void su_change_mouse_baud(int baud)
-{
- struct su_struct *info = su_table;
- int i;
-
- for (i = 0, info = su_table; i < NR_PORTS; i++, info++)
- if (info->kbd_node != 0) break;
- if (i >= NR_PORTS) return;
-
- info->cflag &= ~(CBAUDEX | CBAUD);
- switch(baud) {
- case 1200:
- info->cflag |= B1200;
- break;
- case 2400:
- info->cflag |= B2400;
- break;
- case 4800:
- info->cflag |= B4800;
- break;
- case 9600:
- info->cflag |= B9600;
- break;
- default:
- printk("su_change_mouse_baud: unknown baud rate %d, "
- "defaulting to 1200\n", baud);
- info->cflag |= 1200;
- break;
- }
- change_speed(info);
-}
-
-static void su_flush_chars(struct tty_struct *tty)
-{
- struct su_struct *info = (struct su_struct *)tty->driver_data;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->device, "su_flush_chars"))
- return;
-
- if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
- !info->xmit_buf)
- return;
-
- save_flags(flags); cli();
- info->IER |= UART_IER_THRI;
- serial_out(info, UART_IER, info->IER);
- restore_flags(flags);
-}
-
-static int su_write(struct tty_struct * tty, int from_user,
- const unsigned char *buf, int count)
-{
- int c, ret = 0;
- struct su_struct *info = (struct su_struct *)tty->driver_data;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->device, "su_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 & UART_IER_THRI)) {
- info->IER |= UART_IER_THRI;
- serial_out(info, UART_IER, info->IER);
- }
- return ret;
-}
-
-static int su_write_room(struct tty_struct *tty)
-{
- struct su_struct *info = (struct su_struct *)tty->driver_data;
- int ret;
-
- if (serial_paranoia_check(info, tty->device, "su_write_room"))
- return 0;
- ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
- if (ret < 0)
- ret = 0;
- return ret;
-}
-
-static int su_chars_in_buffer(struct tty_struct *tty)
-{
- struct su_struct *info = (struct su_struct *)tty->driver_data;
-
- if (serial_paranoia_check(info, tty->device, "su_chars_in_buffer"))
- return 0;
- return info->xmit_cnt;
-}
-
-static void su_flush_buffer(struct tty_struct *tty)
-{
- struct su_struct *info = (struct su_struct *)tty->driver_data;
-
- if (serial_paranoia_check(info, tty->device, "su_flush_buffer"))
- return;
- cli();
- info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
- sti();
- 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 su_send_xchar(struct tty_struct *tty, char ch)
-{
- struct su_struct *info = (struct su_struct *)tty->driver_data;
-
- if (serial_paranoia_check(info, tty->device, "su_send_char"))
- return;
-
- info->x_char = ch;
- if (ch) {
- /* Make sure transmit interrupts are on */
- info->IER |= UART_IER_THRI;
- serial_out(info, UART_IER, info->IER);
- }
-}
-
-/*
- * ------------------------------------------------------------
- * su_throttle()
- *
- * This routine is called by the upper-layer tty layer to signal that
- * incoming characters should be throttled.
- * ------------------------------------------------------------
- */
-static void su_throttle(struct tty_struct * tty)
-{
- struct su_struct *info = (struct su_struct *)tty->driver_data;
-#ifdef SERIAL_DEBUG_THROTTLE
- char buf[64];
-
- printk("throttle %s: %d....\n", tty_name(tty, buf),
- tty->ldisc.chars_in_buffer(tty));
-#endif
-
- if (serial_paranoia_check(info, tty->device, "su_throttle"))
- return;
-
- if (I_IXOFF(tty))
- su_send_xchar(tty, STOP_CHAR(tty));
-
- if (tty->termios->c_cflag & CRTSCTS)
- info->MCR &= ~UART_MCR_RTS;
-
- cli();
- serial_out(info, UART_MCR, info->MCR);
- sti();
-}
-
-static void su_unthrottle(struct tty_struct * tty)
-{
- struct su_struct *info = (struct su_struct *)tty->driver_data;
-#ifdef SERIAL_DEBUG_THROTTLE
- char buf[64];
-
- printk("unthrottle %s: %d....\n", tty_name(tty, buf),
- tty->ldisc.chars_in_buffer(tty));
-#endif
-
- if (serial_paranoia_check(info, tty->device, "su_unthrottle"))
- return;
-
- if (I_IXOFF(tty)) {
- if (info->x_char)
- info->x_char = 0;
- else
- su_send_xchar(tty, START_CHAR(tty));
- }
- if (tty->termios->c_cflag & CRTSCTS)
- info->MCR |= UART_MCR_RTS;
- cli();
- serial_out(info, UART_MCR, info->MCR);
- sti();
-}
-
-/*
- * ------------------------------------------------------------
- * su_ioctl() and friends
- * ------------------------------------------------------------
- */
-
-#if 0
-static int get_serial_info(struct su_struct * info,
- struct serial_struct * retinfo)
-{
- struct serial_struct tmp;
-
- if (!retinfo)
- return -EFAULT;
- memset(&tmp, 0, sizeof(tmp));
- tmp.type = info->type;
- tmp.line = info->line;
- tmp.port = info->port;
- tmp.irq = info->irq;
- tmp.flags = info->flags;
- tmp.xmit_fifo_size = info->xmit_fifo_size;
- tmp.baud_base = info->baud_base;
- tmp.close_delay = info->close_delay;
- tmp.closing_wait = info->closing_wait;
- tmp.custom_divisor = info->custom_divisor;
- tmp.hub6 = 0;
- if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
- return -EFAULT;
- return 0;
-}
-
-static int set_serial_info(struct su_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;
- old_state = *state;
-
- change_irq = new_serial.irq != state->irq;
- change_port = (new_serial.port != state->port);
-
- 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));
- 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.port > 0xffff) ||
- (new_serial.type < PORT_UNKNOWN) || (new_serial.type > PORT_MAX)) {
- return -EINVAL;
- }
-
- /* Make sure address is not already in use */
- if (new_serial.type) {
- for (i = 0 ; i < NR_PORTS; i++)
- if ((state != &su_table[i]) &&
- (su_table[i].port == new_serial.port) &&
- su_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 (state->type != old_state.type)
- info->xmit_fifo_size = state->xmit_fifo_size =
- uart_config[state->type].dfl_xmit_fifo_size;
- if (state->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;
-}
-#endif
-
-
-/*
- * 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 su_struct * info, unsigned int *value)
-{
- unsigned char status;
- unsigned int result;
-
- cli();
- status = serial_in(info, UART_LSR);
- sti();
- result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
- return put_user(result,value);
-}
-
-
-static int get_modem_info(struct su_struct * info, unsigned int *value)
-{
- unsigned char control, status;
- unsigned int result;
-
- control = info->MCR;
- cli();
- status = serial_in(info, UART_MSR);
- sti();
- result = ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
- | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
-#ifdef TIOCM_OUT1
- | ((control & UART_MCR_OUT1) ? TIOCM_OUT1 : 0)
- | ((control & UART_MCR_OUT2) ? TIOCM_OUT2 : 0)
-#endif
- | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0)
- | ((status & UART_MSR_RI) ? TIOCM_RNG : 0)
- | ((status & UART_MSR_DSR) ? TIOCM_DSR : 0)
- | ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
- return put_user(result,value);
-}
-
-static int set_modem_info(struct su_struct * info, unsigned int cmd,
- unsigned int *value)
-{
- int error;
- unsigned int arg;
-
- error = get_user(arg, value);
- if (error)
- return error;
- switch (cmd) {
- case TIOCMBIS:
- if (arg & TIOCM_RTS)
- info->MCR |= UART_MCR_RTS;
- if (arg & TIOCM_DTR)
- info->MCR |= UART_MCR_DTR;
-#ifdef TIOCM_OUT1
- if (arg & TIOCM_OUT1)
- info->MCR |= UART_MCR_OUT1;
- if (arg & TIOCM_OUT2)
- info->MCR |= UART_MCR_OUT2;
-#endif
- break;
- case TIOCMBIC:
- if (arg & TIOCM_RTS)
- info->MCR &= ~UART_MCR_RTS;
- if (arg & TIOCM_DTR)
- info->MCR &= ~UART_MCR_DTR;
-#ifdef TIOCM_OUT1
- if (arg & TIOCM_OUT1)
- info->MCR &= ~UART_MCR_OUT1;
- if (arg & TIOCM_OUT2)
- info->MCR &= ~UART_MCR_OUT2;
-#endif
- break;
- case TIOCMSET:
- info->MCR = ((info->MCR & ~(UART_MCR_RTS |
-#ifdef TIOCM_OUT1
- UART_MCR_OUT1 |
- UART_MCR_OUT2 |
-#endif
- UART_MCR_DTR))
- | ((arg & TIOCM_RTS) ? UART_MCR_RTS : 0)
-#ifdef TIOCM_OUT1
- | ((arg & TIOCM_OUT1) ? UART_MCR_OUT1 : 0)
- | ((arg & TIOCM_OUT2) ? UART_MCR_OUT2 : 0)
-#endif
- | ((arg & TIOCM_DTR) ? UART_MCR_DTR : 0));
- break;
- default:
- return -EINVAL;
- }
- cli();
- serial_out(info, UART_MCR, info->MCR);
- sti();
- return 0;
-}
-
-#if 0
-static int do_autoconfig(struct su_struct * info)
-{
- int 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->irq = detect_uart_irq(info->state);
-
- retval = startup(info);
- if (retval)
- return retval;
- return 0;
-}
-#endif
-
-/*
- * su_break() --- routine which turns the break handling on or off
- */
-static void su_break(struct tty_struct *tty, int break_state)
-{
- struct su_struct * info = (struct su_struct *)tty->driver_data;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->device, "su_break"))
- return;
-
- if (!info->port)
- return;
- save_flags(flags); cli();
- if (break_state == -1)
- serial_out(info, UART_LCR,
- serial_inp(info, UART_LCR) | UART_LCR_SBC);
- else
- serial_out(info, UART_LCR,
- serial_inp(info, UART_LCR) & ~UART_LCR_SBC);
- restore_flags(flags);
-}
-
-#ifdef CONFIG_SERIAL_MULTIPORT
-static int get_multiport_struct(struct su_struct * info,
- struct serial_multiport_struct *retinfo)
-{
- struct serial_multiport_struct ret;
- struct rs_multiport_struct *multi;
-
- multi = &rs_multiport[info->state->irq];
-
- ret.port_monitor = multi->port_monitor;
-
- ret.port1 = multi->port1;
- ret.mask1 = multi->mask1;
- ret.match1 = multi->match1;
-
- ret.port2 = multi->port2;
- ret.mask2 = multi->mask2;
- ret.match2 = multi->match2;
-
- ret.port3 = multi->port3;
- ret.mask3 = multi->mask3;
- ret.match3 = multi->match3;
-
- ret.port4 = multi->port4;
- ret.mask4 = multi->mask4;
- ret.match4 = multi->match4;
-
- ret.irq = info->state->irq;
-
- if (copy_to_user(retinfo,&ret,sizeof(*retinfo)))
- return -EFAULT;
- return 0;
-}
-
-static int set_multiport_struct(struct su_struct * info,
- struct serial_multiport_struct *in_multi)
-{
- struct serial_multiport_struct new_multi;
- struct rs_multiport_struct *multi;
- struct serial_state *state;
- int was_multi, now_multi;
- int retval;
- void (*handler)(int, void *, struct pt_regs *);
-
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
- state = info->state;
-
- if (copy_from_user(&new_multi, in_multi,
- sizeof(struct serial_multiport_struct)))
- return -EFAULT;
-
- if (new_multi.irq != state->irq || state->irq == 0 ||
- !IRQ_ports[state->irq])
- return -EINVAL;
-
- multi = &rs_multiport[state->irq];
- was_multi = (multi->port1 != 0);
-
- multi->port_monitor = new_multi.port_monitor;
-
- if (multi->port1)
- release_region(multi->port1,1);
- multi->port1 = new_multi.port1;
- multi->mask1 = new_multi.mask1;
- multi->match1 = new_multi.match1;
- if (multi->port1)
- request_region(multi->port1,1,"serial(multiport1)");
-
- if (multi->port2)
- release_region(multi->port2,1);
- multi->port2 = new_multi.port2;
- multi->mask2 = new_multi.mask2;
- multi->match2 = new_multi.match2;
- if (multi->port2)
- request_region(multi->port2,1,"serial(multiport2)");
-
- if (multi->port3)
- release_region(multi->port3,1);
- multi->port3 = new_multi.port3;
- multi->mask3 = new_multi.mask3;
- multi->match3 = new_multi.match3;
- if (multi->port3)
- request_region(multi->port3,1,"serial(multiport3)");
-
- if (multi->port4)
- release_region(multi->port4,1);
- multi->port4 = new_multi.port4;
- multi->mask4 = new_multi.mask4;
- multi->match4 = new_multi.match4;
- if (multi->port4)
- request_region(multi->port4,1,"serial(multiport4)");
-
- now_multi = (multi->port1 != 0);
-
- if (IRQ_ports[state->irq]->next_port &&
- (was_multi != now_multi)) {
- free_irq(IRQ_4M(state->irq), info);
- if (now_multi)
- handler = rs_interrupt_multi;
- else
- handler = su_interrupt;
-
- retval = request_irq(IRQ_4M(state->irq), handler, IRQ_T(info),
- "serial", info);
- if (retval) {
- printk("Couldn't reallocate serial interrupt "
- "driver!!\n");
- }
- }
-
- return 0;
-}
-#endif
-
-static int su_ioctl(struct tty_struct *tty, struct file * file,
- unsigned int cmd, unsigned long arg)
-{
- int error;
- struct su_struct * info = (struct su_struct *)tty->driver_data;
- struct async_icount cprev, cnow; /* kernel counter temps */
- struct serial_icounter_struct *p_cuser; /* user space */
-
- if (serial_paranoia_check(info, tty->device, "su_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);
-#if 0
- 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);
-#endif
-
- case TIOCSERGETLSR: /* Get line status register */
- return get_lsr_info(info, (unsigned int *) arg);
-
-#if 0
- case TIOCSERGSTRUCT:
- if (copy_to_user((struct async_struct *) arg,
- info, sizeof(struct async_struct)))
- return -EFAULT;
- return 0;
-#endif
-
-#ifdef CONFIG_SERIAL_MULTIPORT
- case TIOCSERGETMULTI:
- return get_multiport_struct(info,
- (struct serial_multiport_struct *) arg);
- case TIOCSERSETMULTI:
- return set_multiport_struct(info,
- (struct serial_multiport_struct *) arg);
-#endif
-
- /*
- * 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:
- cli();
- /* note the counters on entry */
- cprev = info->icount;
- sti();
- while (1) {
- interruptible_sleep_on(&info->delta_msr_wait);
- /* see if a signal did it */
- if (signal_pending(current))
- return -ERESTARTSYS;
- cli();
- cnow = info->icount; /* atomic copy */
- sti();
- 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:
- cli();
- cnow = info->icount;
- sti();
- 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;
- return 0;
-
- default:
- return -ENOIOCTLCMD;
- }
- /* return 0; */ /* Trigger warnings is fall through by a chance. */
-}
-
-static void su_set_termios(struct tty_struct *tty, struct termios *old_termios)
-{
- struct su_struct *info = (struct su_struct *)tty->driver_data;
-
- if ( (tty->termios->c_cflag == old_termios->c_cflag)
- && ( RELEVANT_IFLAG(tty->termios->c_iflag)
- == RELEVANT_IFLAG(old_termios->c_iflag)))
- return;
-
- change_speed(info);
-
- /* Handle transition to B0 status */
- if ((old_termios->c_cflag & CBAUD) &&
- !(tty->termios->c_cflag & CBAUD)) {
- info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
- cli();
- serial_out(info, UART_MCR, info->MCR);
- sti();
- }
-
- /* Handle transition away from B0 status */
- if (!(old_termios->c_cflag & CBAUD) &&
- (tty->termios->c_cflag & CBAUD)) {
- info->MCR |= UART_MCR_DTR;
- if (!(tty->termios->c_cflag & CRTSCTS) ||
- !test_bit(TTY_THROTTLED, &tty->flags)) {
- info->MCR |= UART_MCR_RTS;
- }
- cli();
- serial_out(info, UART_MCR, info->MCR);
- sti();
- }
-
- /* Handle turning off CRTSCTS */
- if ((old_termios->c_cflag & CRTSCTS) &&
- !(tty->termios->c_cflag & CRTSCTS)) {
- tty->hw_stopped = 0;
- su_start(tty);
- }
-
-#if 0
- /*
- * No need to wake up processes in open wait, since they
- * sample the CLOCAL flag once, and don't recheck it.
- * XXX It's not clear whether the current behavior is correct
- * or not. Hence, this may change.....
- */
- if (!(old_termios->c_cflag & CLOCAL) &&
- (tty->termios->c_cflag & CLOCAL))
- wake_up_interruptible(&info->open_wait);
-#endif
-}
-
-/*
- * ------------------------------------------------------------
- * su_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 su_close(struct tty_struct *tty, struct file * filp)
-{
- struct su_struct *info = (struct su_struct *)tty->driver_data;
- unsigned long flags;
-
- if (!info || serial_paranoia_check(info, tty->device, "su_close"))
- return;
-
- 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("su_close ttys%d, count = %d\n", info->line, info->count);
-#endif
- if ((tty->count == 1) && (info->count != 1)) {
- /*
- * Uh, oh. tty->count is 1, which means that the tty
- * structure will be freed. info->count should always
- * be one in these conditions. If it's greater than
- * one, we've got real problems, since it means the
- * serial port won't be shutdown.
- */
- printk("su_close: bad serial port count; tty->count is 1, "
- "info->count is %d\n", info->count);
- info->count = 1;
- }
- if (--info->count < 0) {
- printk("su_close: bad serial port count for ttys%d: %d\n",
- info->line, info->count);
- info->count = 0;
- }
- if (info->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->normal_termios = *tty->termios;
- if (info->flags & ASYNC_CALLOUT_ACTIVE)
- info->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);
- /*
- * Before we drop DTR, make sure the UART transmitter
- * has completely drained; this is especially
- * important if there is a transmit FIFO!
- */
- su_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;
- current->timeout = jiffies + info->close_delay;
- schedule();
- }
- 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);
-}
-
-/*
- * su_wait_until_sent() --- wait until the transmitter is empty
- */
-static void su_wait_until_sent(struct tty_struct *tty, int timeout)
-{
- struct su_struct * info = (struct su_struct *)tty->driver_data;
- unsigned long orig_jiffies, char_time;
- int lsr;
-
- if (serial_paranoia_check(info, tty->device, "su_wait_until_sent"))
- return;
-
- if (info->type == PORT_UNKNOWN)
- return;
-
- 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
- printk("In su_wait_until_sent(%d) check=%lu...", timeout, char_time);
- printk("jiff=%lu...", jiffies);
-#endif
- while (!((lsr = serial_inp(info, UART_LSR)) & UART_LSR_TEMT)) {
-#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
- printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
-#endif
- current->state = TASK_INTERRUPTIBLE;
- current->counter = 0; /* make us low-priority */
- current->timeout = jiffies + char_time;
- schedule();
- if (signal_pending(current))
- break;
- if (timeout && ((orig_jiffies + timeout) < jiffies))
- break;
- }
- current->state = TASK_RUNNING;
-#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
- printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
-#endif
-}
-
-/*
- * su_hangup() --- called by tty_hangup() when a hangup is signaled.
- */
-static void su_hangup(struct tty_struct *tty)
-{
- struct su_struct * info = (struct su_struct *)tty->driver_data;
-
- if (serial_paranoia_check(info, tty->device, "su_hangup"))
- return;
-
- su_flush_buffer(tty);
- shutdown(info);
- info->event = 0;
- info->count = 0;
- info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
- info->tty = 0;
- wake_up_interruptible(&info->open_wait);
-}
-
-/*
- * ------------------------------------------------------------
- * su_open() and friends
- * ------------------------------------------------------------
- */
-static int block_til_ready(struct tty_struct *tty, struct file * filp,
- struct su_struct *info)
-{
- struct wait_queue wait = { current, NULL };
- int retval;
- int do_clocal = 0;
-
- /*
- * If the device is in the middle of being closed, then block
- * until it's done, and then try again.
- */
- if (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 (info->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, info->count is dropped by one, so that
- * su_close() knows when to free things. We restore it upon
- * exit, either normal or abnormal.
- */
- retval = 0;
- add_wait_queue(&info->open_wait, &wait);
-#ifdef SERIAL_DEBUG_OPEN
- printk("block_til_ready before block: ttys%d, count = %d\n",
- info->line, info->count);
-#endif
- cli();
- if (!tty_hung_up_p(filp))
- info->count--;
- sti();
- info->blocked_open++;
- while (1) {
- 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));
- sti();
- 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;
- if (signal_pending(current)) {
- retval = -ERESTARTSYS;
- break;
- }
-#ifdef SERIAL_DEBUG_OPEN
- printk("block_til_ready blocking: ttys%d, count = %d\n",
- info->line, info->count);
-#endif
- schedule();
- }
- current->state = TASK_RUNNING;
- remove_wait_queue(&info->open_wait, &wait);
- if (!tty_hung_up_p(filp))
- info->count++;
- info->blocked_open--;
-#ifdef SERIAL_DEBUG_OPEN
- printk("block_til_ready after blocking: ttys%d, count = %d\n",
- info->line, info->count);
-#endif
- if (retval)
- return retval;
- info->flags |= ASYNC_NORMAL_ACTIVE;
- return 0;
-}
-
-/*
- * This routine is called whenever a serial port is opened. It
- * enables interrupts for a serial port, linking in its async structure into
- * the IRQ chain. It also performs the serial-specific
- * initialization for the tty structure.
- */
-static int su_open(struct tty_struct *tty, struct file * filp)
-{
- struct su_struct *info;
- int retval, line;
- unsigned long page;
-
- line = MINOR(tty->device) - tty->driver.minor_start;
- if ((line < 0) || (line >= NR_PORTS))
- return -ENODEV;
- info = su_table + line;
- if (serial_paranoia_check(info, tty->device, "su_open"))
- return -ENODEV;
- info->count++;
-
-#ifdef SERIAL_DEBUG_OPEN
- printk("su_open %s%d, count = %d\n", tty->driver.name, info->line,
- info->count);
-#endif
- tty->driver_data = info;
- info->tty = tty;
- info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
-
- if (!tmp_buf) {
- page = get_free_page(GFP_KERNEL);
- if (!page)
- 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);
-#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)
- return retval;
-
- MOD_INC_USE_COUNT;
- retval = block_til_ready(tty, filp, info);
- if (retval) {
-#ifdef SERIAL_DEBUG_OPEN
- printk("su_open returning after block_til_ready with %d\n",
- retval);
-#endif
- return retval;
- }
-
- if ((info->count == 1) &&
- (info->flags & ASYNC_SPLIT_TERMIOS)) {
- if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
- *tty->termios = info->normal_termios;
- else
- *tty->termios = info->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
- printk("su_open ttys%d successful...", info->line);
-#endif
- return 0;
-}
-
-/*
- * /proc fs routines....
- */
-
-static inline int line_info(char *buf, struct su_struct *info)
-{
- char stat_buf[30], control, status;
- int ret;
-
- ret = sprintf(buf, "%d: uart:%s port:%X irq:%d",
- info->line, uart_config[info->type].name,
- (int)info->port, info->irq);
-
- if (info->port == 0 || info->type == PORT_UNKNOWN) {
- ret += sprintf(buf+ret, "\n");
- return ret;
- }
-
- /*
- * Figure out the current RS-232 lines
- */
- cli();
- status = serial_in(info, UART_MSR);
- control = info ? info->MCR : serial_in(info, UART_MCR);
- sti();
-
- stat_buf[0] = 0;
- stat_buf[1] = 0;
- if (control & UART_MCR_RTS)
- strcat(stat_buf, "|RTS");
- if (status & UART_MSR_CTS)
- strcat(stat_buf, "|CTS");
- if (control & UART_MCR_DTR)
- strcat(stat_buf, "|DTR");
- if (status & UART_MSR_DSR)
- strcat(stat_buf, "|DSR");
- if (status & UART_MSR_DCD)
- strcat(stat_buf, "|CD");
- if (status & UART_MSR_RI)
- strcat(stat_buf, "|RI");
-
- if (info->quot) {
- ret += sprintf(buf+ret, " baud:%d",
- info->baud_base / info->quot);
- }
-
- ret += sprintf(buf+ret, " tx:%d rx:%d",
- info->icount.tx, info->icount.rx);
-
- if (info->icount.frame)
- ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
-
- if (info->icount.parity)
- ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
-
- if (info->icount.brk)
- ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
-
- if (info->icount.overrun)
- ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
-
- /*
- * Last thing is the RS-232 status lines
- */
- ret += sprintf(buf+ret, " %s\n", stat_buf+1);
- return ret;
-}
-
-int su_read_proc(char *page, char **start, off_t off, int count,
- int *eof, void *data)
-{
- int i, len = 0;
- off_t begin = 0;
-
- len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
- for (i = 0; i < NR_PORTS && len < 4000; i++) {
- len += line_info(page + len, &su_table[i]);
- 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 + (begin-off);
- return ((count < begin+len-off) ? count : begin+len-off);
-}
-
-/*
- * ---------------------------------------------------------------------
- * su_init() and friends
- *
- * su_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_su_version(void)
-{
- printk(KERN_INFO "%s version %s with", serial_name, serial_version);
-#ifdef CONFIG_SERIAL_MANY_PORTS
- printk(" MANY_PORTS");
-#define SERIAL_OPT
-#endif
-#ifdef CONFIG_SERIAL_MULTIPORT
- printk(" MULTIPORT");
-#define SERIAL_OPT
-#endif
-#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 su_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 su_struct *info)
-{
- unsigned char status1, status2, scratch, scratch2;
-#ifdef __sparc_v9__
- struct linux_ebus_device *dev = 0;
- struct linux_ebus *ebus;
-#else
- struct linux_prom_registers reg0;
-#endif
- unsigned long flags;
-
-#ifdef __sparc_v9__
- for_each_ebus(ebus) {
- for_each_ebusdev(dev, ebus) {
- if (!strncmp(dev->prom_name, "su", 2)) {
- if (dev->prom_node == info->kbd_node)
- goto ebus_done;
- if (dev->prom_node == info->ms_node)
- goto ebus_done;
- }
- }
- }
-ebus_done:
- if (!dev)
- return;
-
- info->port = dev->base_address[0];
- if (check_region(info->port, 8))
- return;
-
- info->irq = dev->irqs[0];
-
-#ifdef DEBUG_SERIAL_OPEN
- printk("Found 'su' at %016lx IRQ %s\n", dev->base_address[0],
- __irq_itoa(dev->irqs[0]));
-#endif
-
-#else
- if (info->port_node == 0) {
- return;
- }
- if (prom_getproperty(info->port_node, "reg",
- (char *)®0, sizeof(reg0)) == -1) {
- prom_printf("su: no \"reg\" property\n");
- return;
- }
- prom_apply_obio_ranges(®0, 1);
- if ((info->port = (unsigned long) sparc_alloc_io(reg0.phys_addr,
- 0, reg0.reg_size, "su-regs", reg0.which_io, 0)) == 0) {
- prom_printf("su: cannot map\n");
- return;
- }
- /*
- * There is no intr property on MrCoffee, so hardwire it. Krups?
- */
- info->irq = 13;
-#endif
-
- info->magic = SERIAL_MAGIC;
-
- save_flags(flags); cli();
-
- /*
- * Do a simple existence test first; if we fail this, there's
- * no point trying anything else.
- *
- * 0x80 is used as a nonsense port to prevent against false
- * positives due to ISA bus float. The assumption is that
- * 0x80 is a non-existent port; which should be safe since
- * include/asm/io.h also makes this assumption.
- */
- scratch = serial_in(info, UART_IER);
- su_outb(info, UART_IER, 0);
- scratch2 = serial_in(info, UART_IER);
- su_outb(info, UART_IER, scratch);
- if (scratch2) {
- restore_flags(flags);
- return; /* We failed; there's nothing here */
- }
-
-#if 0 /* P3 You will never beleive but SuperIO fails this test in MrCoffee. */
- scratch = serial_in(info, UART_MCR);
- su_outb(info, UART_MCR, UART_MCR_LOOP | scratch);
- scratch2 = serial_in(info, UART_MSR);
- su_outb(info, UART_MCR, UART_MCR_LOOP | 0x0A);
- status1 = serial_in(info, UART_MSR) & 0xF0;
- su_outb(info, UART_MCR, scratch);
- su_outb(info, UART_MSR, scratch2);
- if (status1 != 0x90) {
- restore_flags(flags);
- return;
- }
-#endif
-
- scratch2 = serial_in(info, UART_LCR);
- su_outb(info, UART_LCR, 0xBF); /* set up for StarTech test */
- su_outb(info, UART_EFR, 0); /* EFR is the same as FCR */
- su_outb(info, UART_LCR, 0);
- su_outb(info, UART_FCR, UART_FCR_ENABLE_FIFO);
- scratch = serial_in(info, UART_IIR) >> 6;
- switch (scratch) {
- case 0:
- info->type = PORT_16450;
- break;
- case 1:
- info->type = PORT_UNKNOWN;
- break;
- case 2:
- info->type = PORT_16550;
- break;
- case 3:
- info->type = PORT_16550A;
- break;
- }
- if (info->type == PORT_16550A) {
- /* Check for Startech UART's */
- su_outb(info, UART_LCR, scratch2 | UART_LCR_DLAB);
- if (su_inb(info, UART_EFR) == 0) {
- info->type = PORT_16650;
- } else {
- su_outb(info, UART_LCR, 0xBF);
- if (su_inb(info, UART_EFR) == 0)
- info->type = PORT_16650V2;
- }
- }
- if (info->type == PORT_16550A) {
- /* Check for TI 16750 */
- su_outb(info, UART_LCR, scratch2 | UART_LCR_DLAB);
- su_outb(info, UART_FCR,
- UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
- scratch = su_inb(info, UART_IIR) >> 5;
- if (scratch == 7) {
- su_outb(info, UART_LCR, 0);
- su_outb(info, UART_FCR, UART_FCR_ENABLE_FIFO);
- scratch = su_inb(info, UART_IIR) >> 5;
- if (scratch == 6)
- info->type = PORT_16750;
- }
- su_outb(info, UART_FCR, UART_FCR_ENABLE_FIFO);
- }
- su_outb(info, UART_LCR, scratch2);
- if (info->type == PORT_16450) {
- scratch = su_inb(info, UART_SCR);
- su_outb(info, UART_SCR, 0xa5);
- status1 = su_inb(info, UART_SCR);
- su_outb(info, UART_SCR, 0x5a);
- status2 = su_inb(info, UART_SCR);
- su_outb(info, UART_SCR, scratch);
-
- if ((status1 != 0xa5) || (status2 != 0x5a))
- info->type = PORT_8250;
- }
- info->xmit_fifo_size = uart_config[info->type].dfl_xmit_fifo_size;
-
- if (info->type == PORT_UNKNOWN) {
- restore_flags(flags);
- return;
- }
-
-#ifdef __sparc_v9__
- sprintf(info->name, "su(%s)", info->ms_node ? "mouse" : "kbd");
- request_region(info->port, 8, info->name);
-#else
- strcpy(info->name, "su(serial)");
-#endif
-
- /*
- * Reset the UART.
- */
- su_outb(info, UART_MCR, 0x00);
- su_outb(info, UART_FCR, (UART_FCR_CLEAR_RCVR |
- UART_FCR_CLEAR_XMIT));
- su_inb(info, UART_RX);
-
- restore_flags(flags);
-}
-
-/*
- * The serial driver boot-time initialization code!
- */
-__initfunc(int su_init(void))
-{
- int i;
- struct su_struct *info;
- 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);
- timer_table[RS_TIMER].fn = su_timer;
- timer_table[RS_TIMER].expires = 0;
-
- for (i = 0; i < NR_IRQS; i++) {
- IRQ_ports[i] = 0;
- IRQ_timeout[i] = 0;
-#ifdef CONFIG_SERIAL_MULTIPORT
- memset(&rs_multiport[i], 0,
- sizeof(struct rs_multiport_struct));
-#endif
- }
-#if 0 /* Must be shared with keyboard on MrCoffee. */
-#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 &&
- su_table[i].irq == su_table[sercons.index].irq)
- su_table[i].irq = 0;
- }
-#endif
-#endif
- show_su_version();
-
- /* Initialize the tty_driver structure */
-
- memset(&serial_driver, 0, sizeof(struct tty_driver));
- serial_driver.magic = TTY_DRIVER_MAGIC;
- serial_driver.driver_name = "su";
- 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 = su_open;
- serial_driver.close = su_close;
- serial_driver.write = su_write;
- serial_driver.put_char = su_put_char;
- serial_driver.flush_chars = su_flush_chars;
- serial_driver.write_room = su_write_room;
- serial_driver.chars_in_buffer = su_chars_in_buffer;
- serial_driver.flush_buffer = su_flush_buffer;
- serial_driver.ioctl = su_ioctl;
- serial_driver.throttle = su_throttle;
- serial_driver.unthrottle = su_unthrottle;
- serial_driver.send_xchar = su_send_xchar;
- serial_driver.set_termios = su_set_termios;
- serial_driver.stop = su_stop;
- serial_driver.start = su_start;
- serial_driver.hangup = su_hangup;
- serial_driver.break_ctl = su_break;
- serial_driver.wait_until_sent = su_wait_until_sent;
- serial_driver.read_proc = su_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 regular su\n");
- if (tty_register_driver(&callout_driver))
- panic("Couldn't register callout su\n");
-
- for (i = 0, info = su_table; i < NR_PORTS; i++, info++) {
- info->magic = SSTATE_MAGIC;
- info->line = i;
- info->type = PORT_UNKNOWN;
- info->baud_base = BAUD_BASE;
- /* info->flags = 0; */
- info->custom_divisor = 0;
- info->close_delay = 5*HZ/10;
- info->closing_wait = 30*HZ;
- info->callout_termios = callout_driver.init_termios;
- info->normal_termios = serial_driver.init_termios;
- info->icount.cts = info->icount.dsr =
- info->icount.rng = info->icount.dcd = 0;
- info->icount.rx = info->icount.tx = 0;
- info->icount.frame = info->icount.parity = 0;
- info->icount.overrun = info->icount.brk = 0;
- info->tqueue.routine = do_softint;
- info->tqueue.data = info;
-
- if (info->kbd_node)
- info->cflag = B1200 | CS8 | CREAD;
- else if (info->ms_node)
- info->cflag = B4800 | CS8 | CREAD;
- else
- info->cflag = B9600 | CS8 | CREAD;
-
- autoconfig(info);
- if (info->type == PORT_UNKNOWN)
- continue;
-
- printk(KERN_INFO "%s at %16lx (irq = %s) is a %s\n",
- info->name, info->port, __irq_itoa(info->irq),
- uart_config[info->type].name);
-
- /*
- * We want startup here because we want mouse and keyboard
- * working without opening. On SPARC console will work
- * without startup.
- */
- if (info->kbd_node) {
- startup(info);
- keyboard_zsinit(su_put_char_kbd);
- } else if (info->ms_node) {
- startup(info);
- sun_mouse_zsinit();
- }
- }
-
- return 0;
-}
-
-__initfunc(int su_probe (unsigned long *memory_start))
-{
- struct su_struct *info = su_table;
- int node, enode, tnode, sunode;
- int kbnode = 0, msnode = 0;
- int devices = 0;
- char prop[128];
- int len;
-
- /*
- * Find su on MrCoffee. We return OK code if find any.
- * Then su_init finds every one and initializes them.
- * We do this early because MrCoffee got no aliases.
- */
- node = prom_getchild(prom_root_node);
- if ((node = prom_searchsiblings(node, "obio")) != 0) {
- if ((sunode = prom_getchild(node)) != 0) {
- if ((sunode = prom_searchsiblings(sunode, "su")) != 0) {
- info->port_node = sunode;
-#ifdef CONFIG_SERIAL_CONSOLE
- /*
- * Console must be initiated after the generic initialization.
- * sunserial_setinitfunc inverts order, so call this before next one.
- */
- sunserial_setinitfunc(memory_start, su_serial_console_init);
-#endif
- sunserial_setinitfunc(memory_start, su_init);
- return 0;
- }
- }
- }
-
- /*
- * Get the nodes for keyboard and mouse from 'aliases'...
- */
- node = prom_getchild(prom_root_node);
- node = prom_searchsiblings(node, "aliases");
- if (!node)
- return -ENODEV;
-
- len = prom_getproperty(node, "keyboard", prop, sizeof(prop));
- if (len > 0) {
- prop[len] = 0;
- kbnode = prom_finddevice(prop);
- }
- if (!kbnode)
- return -ENODEV;
-
- len = prom_getproperty(node, "mouse", prop, sizeof(prop));
- if (len > 0) {
- prop[len] = 0;
- msnode = prom_finddevice(prop);
- }
- if (!msnode)
- return -ENODEV;
-
- /*
- * Find matching EBus nodes...
- */
- node = prom_getchild(prom_root_node);
- if ((node = prom_searchsiblings(node, "pci")) == 0) {
- return -ENODEV; /* Plain sparc */
- }
-
- /*
- * Check for SUNW,sabre on Ultra 5/10/AXi.
- */
- len = prom_getproperty(node, "model", prop, sizeof(prop));
- if ((len > 0) && !strncmp(prop, "SUNW,sabre", len)) {
- node = prom_getchild(node);
- node = prom_searchsiblings(node, "pci");
- }
-
- /*
- * For each PCI bus...
- */
- while (node) {
- enode = prom_getchild(node);
- enode = prom_searchsiblings(enode, "ebus");
-
- /*
- * For each EBus on this PCI...
- */
- while (enode) {
- sunode = prom_getchild(enode);
- tnode = prom_searchsiblings(sunode, "su");
- if (!tnode)
- tnode = prom_searchsiblings(sunode, "su_pnp");
- sunode = tnode;
-
- /*
- * For each 'su' on this EBus...
- */
- while (sunode) {
- /*
- * Does it match?
- */
- if (sunode == kbnode) {
- info->kbd_node = sunode;
- ++info;
- ++devices;
- }
- if (sunode == msnode) {
- info->ms_node = sunode;
- ++info;
- ++devices;
- }
-
- /*
- * Found everything we need?
- */
- if (devices == NR_PORTS)
- goto found;
-
- sunode = prom_getsibling(sunode);
- tnode = prom_searchsiblings(sunode, "su");
- if (!tnode)
- tnode = prom_searchsiblings(sunode,
- "su_pnp");
- sunode = tnode;
- }
- enode = prom_getsibling(enode);
- enode = prom_searchsiblings(enode, "ebus");
- }
- node = prom_getsibling(node);
- node = prom_searchsiblings(node, "pci");
- }
- return -ENODEV;
-
-found:
- sunserial_setinitfunc(memory_start, su_init);
- rs_ops.rs_change_mouse_baud = su_change_mouse_baud;
- sunkbd_setinitfunc(memory_start, sun_kbd_init);
- kbd_ops.compute_shiftstate = sun_compute_shiftstate;
- kbd_ops.setledstate = sun_setledstate;
- kbd_ops.getledstate = sun_getledstate;
- kbd_ops.setkeycode = sun_setkeycode;
- kbd_ops.getkeycode = sun_getkeycode;
-#ifdef CONFIG_PCI
- sunkbd_install_keymaps(memory_start, sun_key_maps, sun_keymap_count,
- sun_func_buf, sun_func_table,
- sun_funcbufsize, sun_funcbufleft,
- sun_accent_table, sun_accent_table_size);
-#endif
- return 0;
-}
-
-#if 0
-#ifdef MODULE
-int init_module(void)
-{
- return su_init(); /* rs_init? su_probe? XXX */
-}
-
-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();
- timer_active &= ~(1 << RS_TIMER);
- timer_table[RS_TIMER].fn = NULL;
- timer_table[RS_TIMER].expires = 0;
- 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 (su_table[i].type != PORT_UNKNOWN)
- release_region(su_table[i].port, 8);
- }
- if (tmp_buf) {
- free_page((unsigned long) tmp_buf);
- tmp_buf = NULL;
- }
-}
-#endif /* MODULE */
-#endif /* deadwood */
-
-/*
- * ------------------------------------------------------------
- * Serial console driver
- * ------------------------------------------------------------
- */
-#ifdef CONFIG_SERIAL_CONSOLE
-
-#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
-
-/*
- * Wait for transmitter & holding register to empty
- */
-static inline void wait_for_xmitr(struct su_struct *info)
-{
- int lsr;
- unsigned int tmout = 1000000;
-
- do {
- lsr = su_inb(info, UART_LSR);
- 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 su_struct *info;
- int ier;
- unsigned i;
-
- info = su_table + co->index;
- /*
- * First save the IER then disable the interrupts
- */
- ier = su_inb(info, UART_IER);
- su_outb(info, UART_IER, 0x00);
-
- /*
- * 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...
- */
- su_outb(info, UART_TX, *s);
- if (*s == 10) {
- wait_for_xmitr(info);
- su_outb(info, UART_TX, 13);
- }
- }
-
- /*
- * Finally, Wait for transmitter & holding register to empty
- * and restore the IER
- */
- wait_for_xmitr(info);
- su_outb(info, UART_IER, ier);
-}
-
-/*
- * Receive character from the serial port
- */
-static int serial_console_wait_key(struct console *co)
-{
- struct su_struct *info;
- int ier;
- int lsr;
- int c;
-
- info = su_table + co->index;
-
- /*
- * First save the IER then disable the interrupts so
- * that the real driver for the port does not get the
- * character.
- */
- ier = su_inb(info, UART_IER);
- su_outb(info, UART_IER, 0x00);
-
- do {
- lsr = su_inb(info, UART_LSR);
- } while (!(lsr & UART_LSR_DR));
- c = su_inb(info, UART_RX);
-
- /*
- * Restore the interrupts
- */
- su_outb(info, UART_IER, ier);
-
- return c;
-}
-
-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 su_open()
- * - initialize the serial port
- * Return non-zero if we didn't find a serial port.
- */
-__initfunc(static int serial_console_setup(struct console *co, char *options))
-{
- struct su_struct *info;
- unsigned cval;
- int baud = 9600;
- int bits = 8;
- int parity = 'n';
- 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';
- }
-
- /*
- * 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
- */
- info = su_table + co->index;
- quot = BAUD_BASE / baud;
- cval = cflag & (CSIZE | CSTOPB);
-#if defined(__powerpc__) || defined(__alpha__)
- cval >>= 8;
-#else /* !__powerpc__ && !__alpha__ */
- cval >>= 4;
-#endif /* !__powerpc__ && !__alpha__ */
- if (cflag & PARENB)
- cval |= UART_LCR_PARITY;
- if (!(cflag & PARODD))
- cval |= UART_LCR_EPAR;
-
- /*
- * Disable UART interrupts, set DTR and RTS high
- * and set speed.
- */
- su_outb(info, UART_IER, 0);
- su_outb(info, UART_MCR, UART_MCR_DTR | UART_MCR_RTS);
- su_outb(info, UART_LCR, cval | UART_LCR_DLAB); /* set DLAB */
- su_outb(info, UART_DLL, quot & 0xff); /* LS of divisor */
- su_outb(info, UART_DLM, quot >> 8); /* MS of divisor */
- su_outb(info, UART_LCR, cval); /* reset DLAB */
- info->quot = quot;
-
- /*
- * If we read 0xff from the LSR, there is no UART here.
- */
- if (su_inb(info, UART_LSR) == 0xff)
- return -1;
-
- return 0;
-}
-
-static struct console sercons = {
- "ttyS",
- serial_console_write,
- NULL,
- serial_console_device,
- serial_console_wait_key,
- NULL,
- serial_console_setup,
- CON_PRINTBUFFER,
- -1,
- 0,
- NULL
-};
-
-/*
- * Register console.
- */
-__initfunc(int su_serial_console_init(void))
-{
- extern int con_is_present(void);
-
- if (con_is_present())
- return 0;
- if (serial_console == 0)
- return 0;
- if (su_table[0].port == 0 || su_table[0].port_node == 0)
- return 0;
- sercons.index = 0;
- register_console(&sercons);
- return 0;
-}
-
-#endif /* CONFIG_SERIAL_CONSOLE */
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TCL-scripts by Sam Shen, slshen@lbl.gov