patch-2.1.124 linux/drivers/sbus/char/su32.c
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- Lines: 3566
- Date:
Sun Oct 4 10:22:44 1998
- Orig file:
v2.1.123/linux/drivers/sbus/char/su32.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.1.123/linux/drivers/sbus/char/su32.c linux/drivers/sbus/char/su32.c
@@ -0,0 +1,3565 @@
+/* $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 */
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen, slshen@lbl.gov