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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [drivers/] [char/] [serial.c] - Blame information for rev 1262

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/*
 *  linux/drivers/char/serial.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  Extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92.  Now
 *  much more extensible to support other serial cards based on the
 *  16450/16550A UART's.  Added support for the AST FourPort and the
 *  Accent Async board.
 *
 *  set_serial_info fixed to set the flags, custom divisor, and uart
 *      type fields.  Fix suggested by Michael K. Johnson 12/12/92.
 *
 *  11/95: TIOCMIWAIT, TIOCGICOUNT by Angelo Haritsis <ah@doc.ic.ac.uk>
 *
 *  03/96: Modularised by Angelo Haritsis <ah@doc.ic.ac.uk>
 *
 *  rs_set_termios fixed to look also for changes of the input
 *      flags INPCK, BRKINT, PARMRK, IGNPAR and IGNBRK.
 *                                            Bernd Anh�upl 05/17/96.
 *
 * Added Support for PCI serial boards which contain 16x50 Chips
 * 31.10.1998 Henning P. Schmiedehausen <hps@tanstaafl.de>
 *
 * This module exports the following rs232 io functions:
 *
 *      int rs_init(void);
 *      int rs_open(struct tty_struct * tty, struct file * filp)
 */
 
#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/config.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/mm.h>
 
#ifdef CONFIG_SERIAL_PCI
#include <linux/pci.h>
#include <linux/bios32.h>
#endif
 
#include <asm/system.h>
 
#if defined(CONFIG_eLIA) && defined(CONFIG_PCI)
#include <asm/mcfpci.h>
#else
#include <asm/io.h>
#endif
 
#ifdef CONFIG_OR32
#include <asm/irq.h>
#include <asm/board.h>
#endif
 
#include <asm/segment.h>
#include <asm/bitops.h>
 
static char *serial_name = "Serial driver";
static char *serial_version = "4.13p1";
 
DECLARE_TASK_QUEUE(tq_serial);
 
struct tty_driver serial_driver, callout_driver;
static int serial_refcount;
 
/* serial subtype definitions */
#define SERIAL_TYPE_NORMAL      1
#define SERIAL_TYPE_CALLOUT     2
 
/* number of characters left in xmit buffer before we ask for more */
#define WAKEUP_CHARS 256
 
#ifdef CONFIG_COLDFIRE
#undef  TTY_MAJOR
#define TTY_MAJOR       24
#undef  TTYAUX_MAJOR
#define TTYAUX_MAJOR    25
#endif
 
/*
 * Serial driver configuration section.  Here are the various options:
 *
 * CONFIG_HUB6
 *              Enables support for the venerable Bell Technologies
 *              HUB6 card.
 *
 * SERIAL_PARANOIA_CHECK
 *              Check the magic number for the async_structure where
 *              ever possible.
 */
 
#define SERIAL_PARANOIA_CHECK
#define CONFIG_SERIAL_NOPAUSE_IO
#define SERIAL_DO_RESTART
 
#undef SERIAL_DEBUG_INTR
#undef SERIAL_DEBUG_OPEN
#undef SERIAL_DEBUG_FLOW
 
#if 0
#define SERIAL_DEBUG_INTR       1
#endif
 
#ifdef CONFIG_SERIAL_PCI
# undef SERIAL_DEBUG_PCI
#endif
 
#define RS_STROBE_TIME (10*HZ)
#define RS_ISR_PASS_LIMIT 256
 
#define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? SA_SHIRQ : SA_INTERRUPT)
 
#define _INLINE_ 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
 
/*
 * IRQ_timeout          - How long the timeout should be for each IRQ
 *                              should be after the IRQ has been active.
 */
#ifdef CONFIG_OR32
static struct async_struct *IRQ_ports[32];
static struct rs_multiport_struct rs_multiport[32];
static int IRQ_timeout[32];
#else
static struct async_struct *IRQ_ports[16];
static struct rs_multiport_struct rs_multiport[16];
static int IRQ_timeout[16];
#endif
static volatile int rs_irq_triggered;
static volatile int rs_triggered;
static int rs_wild_int_mask;
 
#ifdef CONFIG_COLDFIRE
#define IRQMASK(i)      ((i) & 0x0f)
#endif
 
#ifdef CONFIG_OR32
#define IRQMASK(i)      ((i) & 0x1f)
#endif
 
static void autoconfig(struct async_struct * info);
static void change_speed(struct async_struct *info);
 
/*
 * This assumes you have a 1.8432 MHz clock for your UART.
 *
 * It'd be nice if someone built a serial card with a 24.576 MHz
 * clock, since the 16550A is capable of handling a top speed of 1.5
 * megabits/second; but this requires the faster clock.
 */
#define BASE_BAUD ( 1843200 / 16 )
 
/* Base boud for or1k */
#define BASE_BAUD_OR1K ( SYS_CLK / 16 )
 
/*
 * Well, it is not a 24,756 MHz clock but it is at least a start.
 * This PCI board here has a 14,7456 MHz crystal oscillator which is
 * eight times as fast as the standard serial clock...
 */
 
#define PCI_BAUD  ( 14745600 / 16 )
 
/* Standard COM flags (except for COM4, because of the 8514 problem) */
#define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST )
#define STD_COM4_FLAGS ASYNC_BOOT_AUTOCONF
 
#define FOURPORT_FLAGS ASYNC_FOURPORT
#define ACCENT_FLAGS 0
#define BOCA_FLAGS 0
#define HUB6_FLAGS 0
 
#ifdef CONFIG_SERIAL_PCI
 
#define PCI_FLAGS (ASYNC_PCI|ASYNC_BOOT_AUTOCONF)
 
#ifndef PCI_DEVICE_ID_PLX_SPCOM200
#define PCI_DEVICE_ID_PLX_SPCOM200 0x1103
#endif
 
/*
 * The chips we know about
 */
 
#define PCISER_PLX9050  0    /* PLX 9050 local bus bridge as serial card */
#define PCISER_PCCOM4   1    /* "PC COM PCI Bus 4 port serial Adapter" -- from Alvin Sim <alvin@alloycp.com.au> */
 
struct pci_serial_boards pci_serial_tbl[] = {
  { PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_SPCOM200, "SPCom 200", PCISER_PLX9050, pci_space_0|pci_space_1, 1, 0, 128, PCI_BAUD },
  { PCI_VENDOR_ID_DCI, PCI_DEVICE_ID_DCI_PCCOM4,   "PC COM 4",  PCISER_PCCOM4,  pci_space_0,             4, 8, 128, BASE_BAUD },
  {     0, 0, 0, 0, 0, 0, 0, 0, 0 }
};
 
#endif
 
/*
 * The following define the access methods for the HUB6 card. All
 * access is through two ports for all 24 possible chips. The card is
 * selected through the high 2 bits, the port on that card with the
 * "middle" 3 bits, and the register on that port with the bottom
 * 3 bits.
 *
 * While the access port and interrupt is configurable, the default
 * port locations are 0x302 for the port control register, and 0x303
 * for the data read/write register. Normally, the interrupt is at irq3
 * but can be anything from 3 to 7 inclusive. Note that using 3 will
 * require disabling com2.
 */
 
#define C_P(card,port) (((card)<<6|(port)<<3) + 1)
 
struct async_struct rs_table[] = {
        /* UART CLK   PORT IRQ     FLAGS        */
#if defined(CONFIG_NETtel) && defined(CONFIG_M5206e)
        { 0, BASE_BAUD, 0x40000000, 28, STD_COM_FLAGS },/* ttyS0 */
#elif defined(CONFIG_eLIA) && defined(CONFIG_PCI)
        { 0, BASE_BAUD, 0x200, 25, STD_COM_FLAGS },      /* ttyS0 */
        { 0, BASE_BAUD, 0x208, 25, STD_COM_FLAGS },      /* ttyS1 */
        { 0, BASE_BAUD, 0x210, 25, STD_COM_FLAGS },      /* ttyS2 */
        { 0, BASE_BAUD, 0x218, 25, STD_COM_FLAGS },      /* ttyS3 */
#elif defined(CONFIG_OR32)
        { 0, BASE_BAUD_OR1K, UART_BASE_ADD, IRQ_UART_0, STD_COM_FLAGS }, /* ttyS0 */
#else
        { 0, BASE_BAUD, 0x3F8, 4, STD_COM_FLAGS },       /* ttyS0 */
        { 0, BASE_BAUD, 0x2F8, 3, STD_COM_FLAGS },       /* ttyS1 */
        { 0, BASE_BAUD, 0x3E8, 4, STD_COM_FLAGS },       /* ttyS2 */
        { 0, BASE_BAUD, 0x2E8, 3, STD_COM4_FLAGS },      /* ttyS3 */
 
        { 0, BASE_BAUD, 0x1A0, 9, FOURPORT_FLAGS },      /* ttyS4 */
        { 0, BASE_BAUD, 0x1A8, 9, FOURPORT_FLAGS },      /* ttyS5 */
        { 0, BASE_BAUD, 0x1B0, 9, FOURPORT_FLAGS },      /* ttyS6 */
        { 0, BASE_BAUD, 0x1B8, 9, FOURPORT_FLAGS },      /* ttyS7 */
 
        { 0, BASE_BAUD, 0x2A0, 5, FOURPORT_FLAGS },      /* ttyS8 */
        { 0, BASE_BAUD, 0x2A8, 5, FOURPORT_FLAGS },      /* ttyS9 */
        { 0, BASE_BAUD, 0x2B0, 5, FOURPORT_FLAGS },      /* ttyS10 */
        { 0, BASE_BAUD, 0x2B8, 5, FOURPORT_FLAGS },      /* ttyS11 */
 
        { 0, BASE_BAUD, 0x330, 4, ACCENT_FLAGS },        /* ttyS12 */
        { 0, BASE_BAUD, 0x338, 4, ACCENT_FLAGS },        /* ttyS13 */
        { 0, BASE_BAUD, 0x000, 0, 0 },     /* ttyS14 (spare; user configurable) */
        { 0, BASE_BAUD, 0x000, 0, 0 },     /* ttyS15 (spare; user configurable) */
 
        { 0, BASE_BAUD, 0x100, 12, BOCA_FLAGS }, /* ttyS16 */
        { 0, BASE_BAUD, 0x108, 12, BOCA_FLAGS }, /* ttyS17 */
        { 0, BASE_BAUD, 0x110, 12, BOCA_FLAGS }, /* ttyS18 */
        { 0, BASE_BAUD, 0x118, 12, BOCA_FLAGS }, /* ttyS19 */
        { 0, BASE_BAUD, 0x120, 12, BOCA_FLAGS }, /* ttyS20 */
        { 0, BASE_BAUD, 0x128, 12, BOCA_FLAGS }, /* ttyS21 */
        { 0, BASE_BAUD, 0x130, 12, BOCA_FLAGS }, /* ttyS22 */
        { 0, BASE_BAUD, 0x138, 12, BOCA_FLAGS }, /* ttyS23 */
        { 0, BASE_BAUD, 0x140, 12, BOCA_FLAGS }, /* ttyS24 */
        { 0, BASE_BAUD, 0x148, 12, BOCA_FLAGS }, /* ttyS25 */
        { 0, BASE_BAUD, 0x150, 12, BOCA_FLAGS }, /* ttyS26 */
        { 0, BASE_BAUD, 0x158, 12, BOCA_FLAGS }, /* ttyS27 */
        { 0, BASE_BAUD, 0x160, 12, BOCA_FLAGS }, /* ttyS28 */
        { 0, BASE_BAUD, 0x168, 12, BOCA_FLAGS }, /* ttyS29 */
        { 0, BASE_BAUD, 0x170, 12, BOCA_FLAGS }, /* ttyS30 */
        { 0, BASE_BAUD, 0x178, 12, BOCA_FLAGS }, /* ttyS31 */
 
/* You can have up to four HUB6's in the system, but I've only
 * included two cards here for a total of twelve ports.
 */
#ifdef CONFIG_HUB6
        { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,0) },  /* ttyS32 */
        { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,1) }, /* ttyS33 */
        { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,2) }, /* ttyS34 */
        { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,3) }, /* ttyS35 */
        { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,4) }, /* ttyS36 */
        { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(0,5) }, /* ttyS37 */
        { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,0) }, /* ttyS38 */
        { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,1) },        /* ttyS39 */
        { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,2) },        /* ttyS40 */
        { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,3) },        /* ttyS41 */
        { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,4) },        /* ttyS42 */
        { 0, BASE_BAUD, 0x302, 3, HUB6_FLAGS, C_P(1,5) },        /* ttyS43 */
#endif
 
#ifdef CONFIG_SERIAL_PCI
                { 0, BASE_BAUD, 0x0, 0, 0 },       /* ttyS32 or bigger... */
                { 0, BASE_BAUD, 0x0, 0, 0 },       /* ttyS33 */
                { 0, BASE_BAUD, 0x0, 0, 0 },       /* ttyS34 */
                { 0, BASE_BAUD, 0x0, 0, 0 },       /* ttyS35 */
                { 0, BASE_BAUD, 0x0, 0, 0 },       /* ttyS36 */
                { 0, BASE_BAUD, 0x0, 0, 0 },       /* ttyS37 */
                { 0, BASE_BAUD, 0x0, 0, 0 },       /* ttyS38 */
                { 0, BASE_BAUD, 0x0, 0, 0 },       /* ttyS39 */
#endif
#endif /* CONFIG_COLDFIRE */
};
 
 
 
#define NR_PORTS        (sizeof(rs_table)/sizeof(struct async_struct))
 
#ifdef CONFIG_SERIAL_PCI
 
/*
 * currently you can have up to four PCI serial boards in your
 * system. Increase the size of this structure to have more
 */
 
struct pci_struct pci_rs_chips[] = {
  {0, 0,},
  {0, 0,},
  {0, 0,},
  {0, 0,},
};
 
#define PCI_NR_BOARDS   (sizeof(pci_rs_chips)/sizeof(struct pci_struct))
#define PCI_NR_PORTS    8
 
#define PCI_PORT_START (NR_PORTS - PCI_NR_PORTS)
 
#endif
 
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
 
#ifdef CONFIG_OR32
#define REG8(x) (*(volatile unsigned char *)(x))
#define IN_CLK  20000000
 
#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
#define WAIT_FOR_XMITR \
 do { \
       lsr = REG8(UART_BASE_ADD + UART_LSR); \
 } while ((lsr & BOTH_EMPTY) != BOTH_EMPTY)
 
int rs_console_inited = 0;
int rs_console_port = 0;
#ifdef CONFIG_OR32
int rs_console_baud = OR32_CONSOLE_BAUD;
#else
int rs_console_baud = 9600;
#endif
 
/*
 * or32_console_print is registered for printk.
 */
void console_print_or32(const char *p)
{
        char c;
        return;
}
 
void rs_console_init(void)
{
 
  int devisor;
 
  if(rs_console_port != 0)
          return;
 
   /* Reset receiver and transmiter */
  REG8(UART_BASE_ADD + UART_FCR) = UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT;
 
  /* Disable all interrupts */
  REG8(UART_BASE_ADD + UART_IER) = 0x00;
 
  /* Set 8 bit char, 1 stop bit, no parity */
  REG8(UART_BASE_ADD + UART_LCR) = UART_LCR_WLEN8 & ~(UART_LCR_STOP | UART_LCR_PARITY);
 
  /* Set baud rate */
  devisor = BASE_BAUD_OR1K/rs_console_baud;
  REG8(UART_BASE_ADD + UART_LCR) |= UART_LCR_DLAB;
  REG8(UART_BASE_ADD + UART_DLL) = devisor & 0x000000ff;
  REG8(UART_BASE_ADD + UART_DLM) = (devisor >> 8) & 0x000000ff;
  REG8(UART_BASE_ADD + UART_LCR) &= ~(UART_LCR_DLAB);
 
        rs_console_inited++;
        return;
}
 
/*
 * rs_console_print is registered for printk output.
 */
 
void rs_console_print(const char *p)
{
 
  char c;
  unsigned char ier, lsr;
 
extern void putc(char);
#if 1
  ier = REG8(UART_BASE_ADD + UART_IER);
  REG8(UART_BASE_ADD + UART_IER) = 0x00;
#endif
 
  while ((c = *(p++)) != 0) {
#if 1
    WAIT_FOR_XMITR;
    REG8(UART_BASE_ADD + UART_TX) = c;
 
    if (c == '\n') {
      WAIT_FOR_XMITR;
      REG8(UART_BASE_ADD + UART_TX) = '\r';
    }
#else
    putc(c);
#endif
  }
 
#if 1
  WAIT_FOR_XMITR;
  REG8(UART_BASE_ADD + UART_IER) = ier;
 
  /* Dummy read to clear all pending interrupt */
  REG8(UART_BASE_ADD + UART_IIR);
  REG8(UART_BASE_ADD + UART_LSR);
#endif 
 
        return;
}
 
/*
 *      Setup for console. Argument comes from the boot command line.
 */
int rs_console_setup(char *arg)
{
        int     rc = 0;
 
        if (!strncmp(arg, "/dev/ttyS", 9)) {
                rs_console_port = arg[9] - '0';
                arg += 10;
                rc = 1;
        } else if (!strncmp(arg, "/dev/cua", 8)) {
                rs_console_port = arg[8] - '0';
                arg += 9;
                rc = 1;
        }
        if (*arg == ',')
                rs_console_baud = simple_strtoul(arg+1,NULL,0);
        return(rc);
}
#endif
 
/*
 * tmp_buf is used as a temporary buffer by serial_write.  We need to
 * lock it in case the memcpy_fromfs 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 = 0;
static struct semaphore tmp_buf_sem = MUTEX;
 
static inline int serial_paranoia_check(struct async_struct *info,
                                        kdev_t device, const char *routine)
{
#ifdef SERIAL_PARANOIA_CHECK
        static const char *badmagic =
                "Warning: bad magic number for serial struct (%s) in %s\n";
        static const char *badinfo =
                "Warning: null async_struct for (%s) in %s\n";
 
        if (!info) {
                printk(badinfo, kdevname(device), routine);
                return 1;
        }
        if (info->magic != SERIAL_MAGIC) {
                printk(badmagic, kdevname(device), routine);
                return 1;
        }
#endif
        return 0;
}
 
/*
 * 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, 0 };
 
static inline unsigned int serial_in(struct async_struct *info, int offset)
{
#ifdef CONFIG_HUB6
    if (info->hub6) {
        outb(info->hub6 - 1 + offset, info->port);
        return inb(info->port+1);
    } else
#endif
        return inb(info->port + offset);
}
 
static inline unsigned int serial_inp(struct async_struct *info, int offset)
{
#ifdef CONFIG_HUB6
    if (info->hub6) {
        outb(info->hub6 - 1 + offset, info->port);
        return inb_p(info->port+1);
    } else
#endif
#ifdef CONFIG_SERIAL_NOPAUSE_IO
        return inb(info->port + offset);
#else
        return inb_p(info->port + offset);
#endif
}
 
static inline void serial_out(struct async_struct *info, int offset, int value)
{
#ifdef CONFIG_HUB6
    if (info->hub6) {
        outb(info->hub6 - 1 + offset, info->port);
        outb(value, info->port+1);
    } else
#endif
        outb(value, info->port+offset);
}
 
static inline void serial_outp(struct async_struct *info, int offset,
                               int value)
{
#ifdef CONFIG_HUB6
    if (info->hub6) {
        outb(info->hub6 - 1 + offset, info->port);
        outb_p(value, info->port+1);
    } else
#endif
#ifdef CONFIG_SERIAL_NOPAUSE_IO
        outb(value, info->port+offset);
#else
        outb_p(value, info->port+offset);
#endif
}
 
/*
 * ------------------------------------------------------------
 * rs_stop() and rs_start()
 *
 * This routines are called before setting or resetting tty->stopped.
 * They enable or disable transmitter interrupts, as necessary.
 * ------------------------------------------------------------
 */
static void rs_stop(struct tty_struct *tty)
{
        struct async_struct *info = (struct async_struct *)tty->driver_data;
        unsigned long flags;
 
        if (serial_paranoia_check(info, tty->device, "rs_stop"))
                return;
 
        save_flags(flags); cli();
        if (info->IER & UART_IER_THRI) {
                info->IER &= ~UART_IER_THRI;
                serial_out(info, UART_IER, info->IER);
        }
        restore_flags(flags);
}
 
static void rs_start(struct tty_struct *tty)
{
        struct async_struct *info = (struct async_struct *)tty->driver_data;
        unsigned long flags;
 
        if (serial_paranoia_check(info, tty->device, "rs_start"))
                return;
 
        save_flags(flags); cli();
        if (info->xmit_cnt && info->xmit_buf && !(info->IER & 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
 * rs_interrupt().  They were separated out for readability's sake.
 *
 * Note: rs_interrupt() is a "fast" interrupt, which means that it
 * runs with interrupts turned off.  People who may want to modify
 * rs_interrupt() should try to keep the interrupt handler as fast as
 * possible.  After you are done making modifications, it is not a bad
 * idea to do:
 *
 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
 *
 * and look at the resulting assemble code in serial.s.
 *
 *                              - Ted Ts'o (tytso@mit.edu), 7-Mar-93
 * -----------------------------------------------------------------------
 */
 
/*
 * This is the serial driver's interrupt routine while we are probing
 * for submarines.
 */
static void rs_probe(int irq, void *dev_id, struct pt_regs * regs)
{
        rs_irq_triggered = IRQMASK(irq);
        rs_triggered |= 1 << IRQMASK(irq);
        return;
}
 
/*
 * This routine is used by the interrupt handler to schedule
 * processing in the software interrupt portion of the driver.
 */
static _INLINE_ void rs_sched_event(struct async_struct *info,
                                  int event)
{
        info->event |= 1 << event;
        queue_task_irq_off(&info->tqueue, &tq_serial);
        mark_bh(SERIAL_BH);
}
 
static _INLINE_ void receive_chars(struct async_struct *info,
                                 int *status)
{
        struct tty_struct *tty = info->tty;
        unsigned char ch;
        int ignored = 0;
 
        do {
                ch = serial_inp(info, UART_RX);
                if (*status & info->ignore_status_mask) {
                        if (++ignored > 100)
                                break;
                        goto ignore_char;
                }
                if (tty->flip.count >= TTY_FLIPBUF_SIZE)
                        break;
                tty->flip.count++;
                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;
                else if (*status & UART_LSR_OE)
                        *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
                else
                        *tty->flip.flag_buf_ptr++ = 0;
                *tty->flip.char_buf_ptr++ = ch;
        ignore_char:
                *status = serial_inp(info, UART_LSR) & info->read_status_mask;
        } while (*status & UART_LSR_DR);
        queue_task_irq_off(&tty->flip.tqueue, &tq_timer);
#ifdef SERIAL_DEBUG_INTR
        printk("DR...");
#endif
}
 
static _INLINE_ void transmit_chars(struct async_struct *info, int *intr_done)
{
        int count;
 
        if (info->x_char) {
                serial_outp(info, UART_TX, info->x_char);
                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);
                if (--info->xmit_cnt <= 0)
                        break;
        } while (--count > 0);
 
        if (info->xmit_cnt < WAKEUP_CHARS)
                rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
 
#ifdef SERIAL_DEBUG_INTR
        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 async_struct *info)
{
        int     status;
 
        status = serial_in(info, UART_MSR);
 
        if (status & UART_MSR_ANY_DELTA) {
                /* update input line counters */
                if (status & UART_MSR_TERI)
                        info->icount.rng++;
                if (status & UART_MSR_DDSR)
                        info->icount.dsr++;
                if (status & UART_MSR_DDCD)
                        info->icount.dcd++;
                if (status & UART_MSR_DCTS)
                        info->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("scheduling hangup...");
#endif
                        queue_task_irq_off(&info->tqueue_hangup,
                                           &tq_scheduler);
                }
        }
        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);
                                rs_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);
                        }
                }
        }
}
 
/*
 * This is the serial driver's generic interrupt routine
 */
static void rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
{
        int status;
        struct async_struct * info;
        int pass_counter = 0;
        struct async_struct *end_mark = 0;
        int first_multi = 0;
        struct rs_multiport_struct *multi;
 
#ifdef SERIAL_DEBUG_INTR
        printk("rs_interrupt(%d)...", irq);
#endif
 
        info = IRQ_ports[IRQMASK(irq)];
        if (!info)
                return;
 
        multi = &rs_multiport[IRQMASK(irq)];
        if (multi->port_monitor)
                first_multi = inb(multi->port_monitor);
 
        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) & info->read_status_mask;
#ifdef SERIAL_DEBUG_INTR
                printk("status = %x...", status);
#endif
                if (status & UART_LSR_DR)
                        receive_chars(info, &status);
                check_modem_status(info);
                if (status & UART_LSR_THRE)
                        transmit_chars(info, 0);
 
        next:
                info = info->next_port;
                if (!info) {
                        info = IRQ_ports[IRQMASK(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);
        if (multi->port_monitor)
                printk("rs port monitor (normal) irq %d: 0x%x, 0x%x\n",
                       info->irq, first_multi, inb(multi->port_monitor));
#ifdef SERIAL_DEBUG_INTR
        printk("end.\n");
#endif
}
 
/*
 * This is the serial driver's interrupt routine for a single port
 */
static void rs_interrupt_single(int irq, void *dev_id, struct pt_regs * regs)
{
        int status;
        int pass_counter = 0;
        int first_multi = 0;
        struct async_struct * info;
        struct rs_multiport_struct *multi;
 
#ifdef SERIAL_DEBUG_INTR
        printk("rs_interrupt_single(%d)...", irq);
#endif
 
        info = IRQ_ports[IRQMASK(irq)];
        if (!info || !info->tty)
                return;
 
        multi = &rs_multiport[IRQMASK(irq)];
        if (multi->port_monitor)
                first_multi = inb(multi->port_monitor);
 
        do {
                status = serial_inp(info, UART_LSR) & info->read_status_mask;
#ifdef SERIAL_DEBUG_INTR
                printk("status = %x...", status);
#endif
                if (status & UART_LSR_DR)
                        receive_chars(info, &status);
                check_modem_status(info);
                if (status & UART_LSR_THRE)
                        transmit_chars(info, 0);
                if (pass_counter++ > RS_ISR_PASS_LIMIT) {
#if 0
                        printk("rs_single loop break.\n");
#endif
                        break;
                }
        } while (!(serial_in(info, UART_IIR) & UART_IIR_NO_INT));
        info->last_active = jiffies;
        if (multi->port_monitor)
                printk("rs port monitor (single) irq %d: 0x%x, 0x%x\n",
                       info->irq, first_multi, inb(multi->port_monitor));
#ifdef SERIAL_DEBUG_INTR
        printk("end.\n");
#endif
}
 
/*
 * This is the serial driver's for multiport boards
 */
static void rs_interrupt_multi(int irq, void *dev_id, struct pt_regs * regs)
{
        int status;
        struct async_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[IRQMASK(irq)];
        if (!info)
                return;
        multi = &rs_multiport[IRQMASK(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) & info->read_status_mask;
#ifdef SERIAL_DEBUG_INTR
                printk("status = %x...", status);
#endif
                if (status & UART_LSR_DR)
                        receive_chars(info, &status);
                check_modem_status(info);
                if (status & UART_LSR_THRE)
                        transmit_chars(info, 0);
 
        next:
                info = info->next_port;
                if (info)
                        continue;
 
                info = IRQ_ports[IRQMASK(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
}
 
 
/*
 * -------------------------------------------------------------------
 * Here ends the serial interrupt routines.
 * -------------------------------------------------------------------
 */
 
/*
 * This routine is used to handle the "bottom half" processing for the
 * serial driver, known also the "software interrupt" processing.
 * This processing is done at the kernel interrupt level, after the
 * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON.  This
 * is where time-consuming activities which can not be done in the
 * interrupt driver proper are done; the interrupt driver schedules
 * them using rs_sched_event(), and they get done here.
 */
static void do_serial_bh(void)
{
        run_task_queue(&tq_serial);
}
 
static void do_softint(void *private_)
{
        struct async_struct     *info = (struct async_struct *) private_;
        struct tty_struct       *tty;
 
        tty = info->tty;
        if (!tty)
                return;
 
        if (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 routine is called from the scheduler tqueue when the interrupt
 * routine has signalled that a hangup has occurred.  The path of
 * hangup processing is:
 *
 *      serial interrupt routine -> (scheduler tqueue) ->
 *      do_serial_hangup() -> tty->hangup() -> rs_hangup()
 *
 */
static void do_serial_hangup(void *private_)
{
        struct async_struct     *info = (struct async_struct *) private_;
        struct tty_struct       *tty;
 
        tty = info->tty;
        if (!tty)
                return;
 
        tty_hangup(tty);
}
 
 
/*
 * This subroutine is called when the RS_TIMER goes off.  It is used
 * by the serial driver to handle ports that do not have an interrupt
 * (irq=0).  This doesn't work very well for 16450's, but gives barely
 * passable results for a 16550A.  (Although at the expense of much
 * CPU overhead).
 */
static void rs_timer(void)
{
        static unsigned long last_strobe = 0;
        struct async_struct *info;
        unsigned int    i;
 
        if ((jiffies - last_strobe) >= RS_STROBE_TIME) {
                for (i=1; i < 16; i++) {
                        info = IRQ_ports[IRQMASK(i)];
                        if (!info)
                                continue;
                        cli();
                        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);
                                if (rs_multiport[IRQMASK(i)].port1)
                                        rs_interrupt_multi(i, NULL, NULL);
                                else
                                        rs_interrupt(i, NULL, NULL);
                        } else
                                rs_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[IRQMASK(0)]) {
                cli();
                rs_interrupt(0, NULL, NULL);
                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.
 * ---------------------------------------------------------------
 */
 
#ifndef CONFIG_COLDFIRE
/*
 * Grab all interrupts in preparation for doing an automatic irq
 * detection.  dontgrab is a mask of irq's _not_ to grab.  Returns a
 * mask of irq's which were grabbed and should therefore be freed
 * using free_all_interrupts().
 */
static int grab_all_interrupts(int dontgrab)
{
        int                     irq_lines = 0;
        int                     i, mask;
 
        for (i = 0, mask = 1; i < 16; i++, mask <<= 1) {
                if (!(mask & dontgrab) && !request_irq(i, rs_probe, SA_INTERRUPT, "serial probe", NULL)) {
                        irq_lines |= mask;
                }
        }
        return irq_lines;
}
 
/*
 * Release all interrupts grabbed by grab_all_interrupts
 */
static void free_all_interrupts(int irq_lines)
{
        int     i;
 
        for (i = 0; i < 16; i++) {
                if (irq_lines & (1 << i))
                        free_irq(i, NULL);
        }
}
#endif /* CONFIG_COLDFIRE */
 
/*
 * This routine figures out the correct timeout for a particular IRQ.
 * It uses the smallest timeout of all of the serial ports in a
 * particular interrupt chain.  Now only used for IRQ 0....
 */
static void figure_IRQ_timeout(int irq)
{
        struct  async_struct    *info;
        int     timeout = 60*HZ;        /* 60 seconds === a long time :-) */
 
        info = IRQ_ports[IRQMASK(irq)];
        if (!info) {
                IRQ_timeout[IRQMASK(irq)] = 60*HZ;
                return;
        }
        while (info) {
                if (info->timeout < timeout)
                        timeout = info->timeout;
                info = info->next_port;
        }
        if (!irq)
                timeout = timeout / 2;
        IRQ_timeout[IRQMASK(irq)] = timeout ? timeout : 1;
}
 
static int startup(struct async_struct * info)
{
        unsigned int ICP;
        unsigned long flags;
        int     retval;
        void (*handler)(int, void *, struct pt_regs *);
        unsigned long page;
 
        page = get_free_page(GFP_KERNEL);
        if (!page)
                return -ENOMEM;
 
 
        save_flags(flags); cli();
 
        if (info->flags & ASYNC_INITIALIZED) {
                free_page(page);
                restore_flags(flags);
                return 0;
        }
 
        if (!info->port || !info->type) {
                if (info->tty)
                        set_bit(TTY_IO_ERROR, &info->tty->flags);
                free_page(page);
                restore_flags(flags);
                return 0;
        }
        if (info->xmit_buf)
                free_page(page);
        else
                info->xmit_buf = (unsigned char *) page;
 
#ifdef SERIAL_DEBUG_OPEN
        printk("starting up ttys%d (irq %d)...", info->line, info->irq);
#endif
 
        /*
         * Clear the FIFO buffers and disable them
         * (they will be reenabled in change_speed())
         */
        if (info->type == PORT_16650) {
                serial_outp(info, UART_FCR, (UART_FCR_CLEAR_RCVR |
                                             UART_FCR_CLEAR_XMIT));
                info->xmit_fifo_size = 1; /* disabled for now */
        } else if (info->type == PORT_16550A) {
                serial_outp(info, UART_FCR, (UART_FCR_CLEAR_RCVR |
                                             UART_FCR_CLEAR_XMIT));
                info->xmit_fifo_size = 16;
        } else
                info->xmit_fifo_size = 1;
 
        /*
         * 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) {
                restore_flags(flags);
                if (suser()) {
                        if (info->tty)
                                set_bit(TTY_IO_ERROR, &info->tty->flags);
                        return 0;
                } else
                        return -ENODEV;
        }
 
#ifndef CONFIG_COLDFIRE
        /*
         * Allocate the IRQ if necessary
         */
        if (info->irq && (!IRQ_ports[IRQMASK(info->irq)] ||
                          !IRQ_ports[IRQMASK(info->irq)]->next_port)) {
                if (IRQ_ports[IRQMASK(info->irq)]) {
                        free_irq(info->irq, NULL);
                        if (rs_multiport[IRQMASK(info->irq)].port1)
                                handler = rs_interrupt_multi;
                        else
                                handler = rs_interrupt;
                } else
                        handler = rs_interrupt_single;
 
                retval = request_irq(info->irq, handler, IRQ_T(info),
                                     "serial", NULL);
                if (retval) {
                        restore_flags(flags);
                        if (suser()) {
                                if (info->tty)
                                        set_bit(TTY_IO_ERROR,
                                                &info->tty->flags);
                                return 0;
                        } else
                                return retval;
                }
        }
#endif
 
        /*
         * 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 */
        if (info->flags & ASYNC_FOURPORT) {
                info->MCR = UART_MCR_DTR | UART_MCR_RTS;
                info->MCR_noint = UART_MCR_DTR | UART_MCR_OUT1;
        } else {
                info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
                info->MCR_noint = UART_MCR_DTR | UART_MCR_RTS;
        }
#if defined(__alpha__) && !defined(CONFIG_PCI)
        info->MCR |= UART_MCR_OUT1 | UART_MCR_OUT2;
        info->MCR_noint |= UART_MCR_OUT1 | UART_MCR_OUT2;
#endif
        if (info->irq == 0)
                info->MCR = info->MCR_noint;
        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 */
 
        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);
        }
 
        /*
         * 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;
 
        /*
         * Insert serial port into IRQ chain.
         */
        info->prev_port = 0;
        info->next_port = IRQ_ports[IRQMASK(info->irq)];
        if (info->next_port)
                info->next_port->prev_port = info;
        IRQ_ports[IRQMASK(info->irq)] = info;
        figure_IRQ_timeout(info->irq);
 
        /*
         * Set up serial timers...
         */
        timer_table[RS_TIMER].expires = jiffies + 2*HZ/100;
        timer_active |= 1 << RS_TIMER;
 
        /*
         * and set the speed of the serial port
         */
        change_speed(info);
 
        info->flags |= ASYNC_INITIALIZED;
        restore_flags(flags);
        return 0;
}
 
/*
 * This routine will shutdown a serial port; interrupts are disabled, and
 * DTR is dropped if the hangup on close termio flag is on.
 */
static void shutdown(struct async_struct * info)
{
        unsigned long   flags;
        int             retval;
 
        if (!(info->flags & ASYNC_INITIALIZED))
                return;
 
#ifdef SERIAL_DEBUG_OPEN
        printk("Shutting down serial port %d (irq %d)....", info->line,
               info->irq);
#endif
 
        save_flags(flags); cli(); /* Disable interrupts */
 
        /*
         * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
         * here so the queue might never be waken up
         */
        wake_up_interruptible(&info->delta_msr_wait);
 
        /*
         * First unlink the serial port from the IRQ chain...
         */
        if (info->next_port)
                info->next_port->prev_port = info->prev_port;
        if (info->prev_port)
                info->prev_port->next_port = info->next_port;
        else
                IRQ_ports[IRQMASK(info->irq)] = info->next_port;
        figure_IRQ_timeout(info->irq);
 
#ifndef CONFIG_COLDFIRE
        /*
         * Free the IRQ, if necessary
         */
        if (info->irq && (!IRQ_ports[IRQMASK(info->irq)] ||
                          !IRQ_ports[IRQMASK(info->irq)]->next_port)) {
                if (IRQ_ports[IRQMASK(info->irq)]) {
                        free_irq(info->irq, NULL);
                        retval = request_irq(info->irq, rs_interrupt_single,
                                             IRQ_T(info), "serial", NULL);
 
                        if (retval)
                                printk("serial shutdown: request_irq: error %d"
                                       "  Couldn't reacquire IRQ.\n", retval);
                } else
                        free_irq(info->irq, NULL);
        }
#endif /* CONFIG_COLDFIRE */
 
        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 */
        if (info->flags & ASYNC_FOURPORT) {
                /* reset interrupts on the AST Fourport board */
                (void) inb((info->port & 0xFE0) | 0x01F);
        }
 
        if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) {
                info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
                info->MCR_noint &= ~(UART_MCR_DTR|UART_MCR_RTS);
        }
        serial_outp(info, UART_MCR, info->MCR_noint);
 
        /* 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);
 
        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 async_struct *info)
{
        unsigned int port;
        int     quot = 0;
        unsigned cflag,cval,fcr;
        int     i;
        unsigned long flags;
 
        if (!info->tty || !info->tty->termios)
                return;
        cflag = info->tty->termios->c_cflag;
        if (!(port = info->port))
                return;
        i = cflag & CBAUD;
        if (i & CBAUDEX) {
                i &= ~CBAUDEX;
                if (i < 1 || i > 2)
                        info->tty->termios->c_cflag &= ~CBAUDEX;
                else
                        i += 15;
        }
        if (i == 15) {
                if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
                        i += 1;
                if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
                        i += 2;
                if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
                        quot = info->custom_divisor;
        }
        if (quot) {
                info->timeout = ((info->xmit_fifo_size*HZ*15*quot) /
                                 info->baud_base) + 2;
        } else if (baud_table[i] == 134) {
                quot = (2*info->baud_base / 269);
                info->timeout = (info->xmit_fifo_size*HZ*30/269) + 2;
        } else if (baud_table[i]) {
                quot = info->baud_base / baud_table[i];
                info->timeout = (info->xmit_fifo_size*HZ*15/baud_table[i]) + 2;
        } else {
                quot = 0;
                info->timeout = 0;
        }
        if (quot) {
                info->MCR |= UART_MCR_DTR;
                info->MCR_noint |= UART_MCR_DTR;
                save_flags(flags); cli();
                serial_out(info, UART_MCR, info->MCR);
                restore_flags(flags);
        } else {
                info->MCR &= ~UART_MCR_DTR;
                info->MCR_noint &= ~UART_MCR_DTR;
                save_flags(flags); cli();
                serial_out(info, UART_MCR, info->MCR);
                restore_flags(flags);
                return;
        }
        /* byte size and parity */
        switch (cflag & CSIZE) {
              case CS5: cval = 0x00; break;
              case CS6: cval = 0x01; break;
              case CS7: cval = 0x02; break;
              case CS8: cval = 0x03; break;
              default:  cval = 0x00; break;     /* too keep GCC shut... */
        }
        if (cflag & CSTOPB) {
                cval |= 0x04;
        }
        if (cflag & PARENB)
                cval |= UART_LCR_PARITY;
        if (!(cflag & PARODD))
                cval |= UART_LCR_EPAR;
        if (info->type == PORT_16550A) {
                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;
        } else if (info->type == PORT_16650) {
                /*
                 * On the 16650, we disable the FIFOs altogether
                 * because of a design bug in how the implement
                 * things.  We could support it by completely changing
                 * how we handle the interrupt driver, but not today....
                 *
                 * N.B.  Because there's no way to set a FIFO trigger
                 * at 1 char, we'd probably disable at speed below
                 * 2400 baud anyway...
                 */
                fcr = 0;
        } else
                fcr = 0;
 
        /* CTS flow control flag and modem status interrupts */
        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;
 
        info->ignore_status_mask = 0;
#if 0
        /* This should be safe, but for some broken bits of hardware... */
        if (I_IGNPAR(info->tty)) {
                info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
                info->read_status_mask |= UART_LSR_PE | UART_LSR_FE;
        }
#endif
        if (I_IGNBRK(info->tty)) {
                info->ignore_status_mask |= UART_LSR_BI;
                info->read_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 | \
                                UART_LSR_PE | UART_LSR_FE;
                        info->read_status_mask |= UART_LSR_OE | \
                                UART_LSR_PE | UART_LSR_FE;
                }
        }
        save_flags(flags); cli();
        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 */
        serial_outp(info, UART_LCR, cval);              /* reset DLAB */
        serial_outp(info, UART_FCR, fcr);       /* set fcr */
        restore_flags(flags);
}
 
static void rs_put_char(struct tty_struct *tty, unsigned char ch)
{
        struct async_struct *info = (struct async_struct *)tty->driver_data;
        unsigned long flags;
 
        if (serial_paranoia_check(info, tty->device, "rs_put_char"))
                return;
 
        if (!tty || !info->xmit_buf)
                return;
 
        save_flags(flags); cli();
        if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1) {
                restore_flags(flags);
                return;
        }
 
        info->xmit_buf[info->xmit_head++] = ch;
        info->xmit_head &= SERIAL_XMIT_SIZE-1;
        info->xmit_cnt++;
        restore_flags(flags);
}
 
static void rs_flush_chars(struct tty_struct *tty)
{
        struct async_struct *info = (struct async_struct *)tty->driver_data;
        unsigned long flags;
 
        if (serial_paranoia_check(info, tty->device, "rs_flush_chars"))
                return;
 
        if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
            !info->xmit_buf)
                return;
 
        save_flags(flags); cli();
        info->IER |= UART_IER_THRI;
        serial_out(info, UART_IER, info->IER);
        restore_flags(flags);
}
 
static int rs_write(struct tty_struct * tty, int from_user,
                    const unsigned char *buf, int count)
{
        int     c, total = 0;
        struct async_struct *info = (struct async_struct *)tty->driver_data;
        unsigned long flags;
 
        if (serial_paranoia_check(info, tty->device, "rs_write"))
                return 0;
 
        if (!tty || !info->xmit_buf || !tmp_buf)
                return 0;
 
        if (from_user)
                down(&tmp_buf_sem);
        save_flags(flags);
        while (1) {
                cli();
                c = MIN(count, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
                                   SERIAL_XMIT_SIZE - info->xmit_head));
                if (c <= 0)
                        break;
 
                if (from_user) {
                        memcpy_fromfs(tmp_buf, buf, c);
                        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);
                } else
                        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;
                total += c;
        }
        if (from_user)
                up(&tmp_buf_sem);
        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);
        }
        restore_flags(flags);
        return total;
}
 
static int rs_write_room(struct tty_struct *tty)
{
        struct async_struct *info = (struct async_struct *)tty->driver_data;
        int     ret;
 
        if (serial_paranoia_check(info, tty->device, "rs_write_room"))
                return 0;
        ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
        if (ret < 0)
                ret = 0;
        return ret;
}
 
static int rs_chars_in_buffer(struct tty_struct *tty)
{
        struct async_struct *info = (struct async_struct *)tty->driver_data;
 
        if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer"))
                return 0;
        return info->xmit_cnt;
}
 
static void rs_flush_buffer(struct tty_struct *tty)
{
        struct async_struct *info = (struct async_struct *)tty->driver_data;
 
        if (serial_paranoia_check(info, tty->device, "rs_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);
}
 
/*
 * ------------------------------------------------------------
 * rs_throttle()
 *
 * This routine is called by the upper-layer tty layer to signal that
 * incoming characters should be throttled.
 * ------------------------------------------------------------
 */
static void rs_throttle(struct tty_struct * tty)
{
        struct async_struct *info = (struct async_struct *)tty->driver_data;
#ifdef SERIAL_DEBUG_THROTTLE
        char    buf[64];
 
        printk("throttle %s: %d....\n", _tty_name(tty, buf),
               tty->ldisc.chars_in_buffer(tty));
#endif
 
        if (serial_paranoia_check(info, tty->device, "rs_throttle"))
                return;
 
        if (I_IXOFF(tty))
                info->x_char = STOP_CHAR(tty);
 
        info->MCR &= ~UART_MCR_RTS;
        info->MCR_noint &= ~UART_MCR_RTS;
        cli();
        serial_out(info, UART_MCR, info->MCR);
        sti();
}
 
static void rs_unthrottle(struct tty_struct * tty)
{
        struct async_struct *info = (struct async_struct *)tty->driver_data;
#ifdef SERIAL_DEBUG_THROTTLE
        char    buf[64];
 
        printk("unthrottle %s: %d....\n", _tty_name(tty, buf),
               tty->ldisc.chars_in_buffer(tty));
#endif
 
        if (serial_paranoia_check(info, tty->device, "rs_unthrottle"))
                return;
 
        if (I_IXOFF(tty)) {
                if (info->x_char)
                        info->x_char = 0;
                else
                        info->x_char = START_CHAR(tty);
        }
        info->MCR |= UART_MCR_RTS;
        info->MCR_noint |= UART_MCR_RTS;
        cli();
        serial_out(info, UART_MCR, info->MCR);
        sti();
}
 
/*
 * ------------------------------------------------------------
 * rs_ioctl() and friends
 * ------------------------------------------------------------
 */
 
static int get_serial_info(struct async_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.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 = info->hub6;
        memcpy_tofs(retinfo,&tmp,sizeof(*retinfo));
        return 0;
}
 
static int set_serial_info(struct async_struct * info,
                           struct serial_struct * new_info)
{
        struct serial_struct new_serial;
        struct async_struct old_info;
        unsigned int            i,change_irq,change_port;
        int                     retval = 0;
 
        if (!new_info)
                return -EFAULT;
        memcpy_fromfs(&new_serial,new_info,sizeof(new_serial));
        old_info = *info;
 
        change_irq = new_serial.irq != info->irq;
        change_port = (new_serial.port != info->port) || (new_serial.hub6 != info->hub6);
 
        if (!suser()) {
                if (change_irq || change_port ||
                    (new_serial.baud_base != info->baud_base) ||
                    (new_serial.type != info->type) ||
                    (new_serial.close_delay != info->close_delay) ||
                    ((new_serial.flags & ~ASYNC_USR_MASK) !=
                     (info->flags & ~ASYNC_USR_MASK)))
                        return -EPERM;
                info->flags = ((info->flags & ~ASYNC_USR_MASK) |
                               (new_serial.flags & ASYNC_USR_MASK));
                info->custom_divisor = new_serial.custom_divisor;
                goto check_and_exit;
        }
/* SIMON */
#if 0
#ifndef CONFIG_COLDFIRE
        if (new_serial.irq == 2)
                new_serial.irq = 9;
 
        if ((new_serial.irq > 15) || (new_serial.port > 0xffff) ||
            (new_serial.type < PORT_UNKNOWN) || (new_serial.type > PORT_MAX)) {
                return -EINVAL;
        }
#endif
#endif
 
        /* Make sure address is not already in use */
        if (new_serial.type) {
                for (i = 0 ; i < NR_PORTS; i++)
                        if ((info != &rs_table[i]) &&
                            (rs_table[i].port == new_serial.port) &&
                            rs_table[i].type)
                                return -EADDRINUSE;
        }
 
        if ((change_port || change_irq) && (info->count > 1))
                return -EBUSY;
 
        /*
         * OK, past this point, all the error checking has been done.
         * At this point, we start making changes.....
         */
 
        info->baud_base = new_serial.baud_base;
        info->flags = ((info->flags & ~ASYNC_FLAGS) |
                        (new_serial.flags & ASYNC_FLAGS));
        info->custom_divisor = new_serial.custom_divisor;
        info->type = new_serial.type;
        info->close_delay = new_serial.close_delay * HZ/100;
        info->closing_wait = new_serial.closing_wait * HZ/100;
 
        release_region(info->port,8);
        if (change_port || change_irq) {
                /*
                 * We need to shutdown the serial port at the old
                 * port/irq combination.
                 */
                shutdown(info);
                info->irq = new_serial.irq;
                info->port = new_serial.port;
                info->hub6 = new_serial.hub6;
        }
        if(info->type != PORT_UNKNOWN)
                request_region(info->port,8,"serial(set)");
 
 
check_and_exit:
        if (!info->port || !info->type)
                return 0;
        if (info->flags & ASYNC_INITIALIZED) {
                if (((old_info.flags & ASYNC_SPD_MASK) !=
                     (info->flags & ASYNC_SPD_MASK)) ||
                    (old_info.custom_divisor != info->custom_divisor))
                        change_speed(info);
        } else
                retval = startup(info);
        return retval;
}
 
 
/*
 * get_lsr_info - get line status register info
 *
 * Purpose: Let user call ioctl() to get info when the UART physically
 *          is emptied.  On bus types like RS485, the transmitter must
 *          release the bus after transmitting. This must be done when
 *          the transmit shift register is empty, not be done when the
 *          transmit holding register is empty.  This functionality
 *          allows an RS485 driver to be written in user space.
 */
static int get_lsr_info(struct async_struct * info, unsigned int *value)
{
        unsigned char status;
        unsigned int result;
 
        cli();
        status = serial_in(info, UART_LSR);
        sti();
        result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
        put_user(result,value);
        return 0;
}
 
 
static int get_modem_info(struct async_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)
                | ((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);
        put_user(result,value);
        return 0;
}
 
static int set_modem_info(struct async_struct * info, unsigned int cmd,
                          unsigned int *value)
{
        int error;
        unsigned int arg;
 
        error = verify_area(VERIFY_READ, value, sizeof(int));
        if (error)
                return error;
        arg = get_user(value);
        switch (cmd) {
        case TIOCMBIS:
                if (arg & TIOCM_RTS) {
                        info->MCR |= UART_MCR_RTS;
                        info->MCR_noint |= UART_MCR_RTS;
                }
                if (arg & TIOCM_DTR) {
                        info->MCR |= UART_MCR_DTR;
                        info->MCR_noint |= UART_MCR_DTR;
                }
                break;
        case TIOCMBIC:
                if (arg & TIOCM_RTS) {
                        info->MCR &= ~UART_MCR_RTS;
                        info->MCR_noint &= ~UART_MCR_RTS;
                }
                if (arg & TIOCM_DTR) {
                        info->MCR &= ~UART_MCR_DTR;
                        info->MCR_noint &= ~UART_MCR_DTR;
                }
                break;
        case TIOCMSET:
                info->MCR = ((info->MCR & ~(UART_MCR_RTS | UART_MCR_DTR))
                             | ((arg & TIOCM_RTS) ? UART_MCR_RTS : 0)
                             | ((arg & TIOCM_DTR) ? UART_MCR_DTR : 0));
                info->MCR_noint = ((info->MCR_noint
                                    & ~(UART_MCR_RTS | UART_MCR_DTR))
                                   | ((arg & TIOCM_RTS) ? UART_MCR_RTS : 0)
                                   | ((arg & TIOCM_DTR) ? UART_MCR_DTR : 0));
                break;
        default:
                return -EINVAL;
        }
        cli();
        serial_out(info, UART_MCR, info->MCR);
        sti();
        return 0;
}
 
static int do_autoconfig(struct async_struct * info)
{
        int                     retval;
 
        if (!suser())
                return -EPERM;
 
        if (info->count > 1)
                return -EBUSY;
 
        shutdown(info);
 
        cli();
        autoconfig(info);
        sti();
 
        retval = startup(info);
        if (retval)
                return retval;
        return 0;
}
 
 
/*
 * rs_break() --- routine which turns the break handling on or off
 * adapted from 2.1.124
 */
static void rs_break(struct async_struct * info, int break_state)
{
        unsigned long flags;
 
        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);
}
 
/*
 * This routine sends a break character out the serial port.
 */
static void send_break( struct async_struct * info, int duration)
{
        if (!info->port)
                return;
        current->state = TASK_INTERRUPTIBLE;
        current->timeout = jiffies + duration;
        cli();
        serial_out(info, UART_LCR, serial_inp(info, UART_LCR) | UART_LCR_SBC);
        schedule();
        serial_out(info, UART_LCR, serial_inp(info, UART_LCR) & ~UART_LCR_SBC);
        sti();
}
 
#ifndef CONFIG_COLDFIRE
/*
 * This routine returns a bitfield of "wild interrupts".  Basically,
 * any unclaimed interrupts which is flapping around.
 */
static int check_wild_interrupts(int doprint)
{
        int     i, mask;
        int     wild_interrupts = 0;
        int     irq_lines;
        unsigned long timeout;
        unsigned long flags;
 
        /* Turn on interrupts (they may be off) */
        save_flags(flags); sti();
 
        irq_lines = grab_all_interrupts(0);
 
        /*
         * Delay for 0.1 seconds -- we use a busy loop since this may
         * occur during the bootup sequence
         */
        timeout = jiffies+HZ/10;
        while (timeout >= jiffies)
                ;
 
        rs_triggered = 0;        /* Reset after letting things settle */
 
        timeout = jiffies+HZ/10;
        while (timeout >= jiffies)
                ;
 
        for (i = 0, mask = 1; i < 16; i++, mask <<= 1) {
                if ((rs_triggered & (1 << i)) &&
                    (irq_lines & (1 << i))) {
                        wild_interrupts |= mask;
                        if (doprint)
                                printk("Wild interrupt?  (IRQ %d)\n", i);
                }
        }
        free_all_interrupts(irq_lines);
        restore_flags(flags);
        return wild_interrupts;
}
 
static int get_multiport_struct(struct async_struct * info,
                                struct serial_multiport_struct *retinfo)
{
        struct serial_multiport_struct ret;
        struct rs_multiport_struct *multi;
 
        multi = &rs_multiport[IRQMASK(info->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->irq;
 
        memcpy_tofs(retinfo,&ret,sizeof(*retinfo));
        return 0;
 
}
 
static int set_multiport_struct(struct async_struct * info,
                                struct serial_multiport_struct *in_multi)
{
        struct serial_multiport_struct new_multi;
        struct rs_multiport_struct *multi;
        int     was_multi, now_multi;
        int     retval;
        void (*handler)(int, void *, struct pt_regs *);
 
        if (!suser())
                return -EPERM;
        if (!in_multi)
                return -EFAULT;
        memcpy_fromfs(&new_multi, in_multi,
                      sizeof(struct serial_multiport_struct));
 
        if (new_multi.irq != info->irq || info->irq == 0 ||
            !IRQ_ports[IRQMASK(info->irq)])
                return -EINVAL;
 
        multi = &rs_multiport[IRQMASK(info->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[IRQMASK(info->irq)]->next_port &&
            (was_multi != now_multi)) {
                free_irq(info->irq, NULL);
                if (now_multi)
                        handler = rs_interrupt_multi;
                else
                        handler = rs_interrupt;
 
                retval = request_irq(info->irq, handler, IRQ_T(info),
                                     "serial", NULL);
                if (retval) {
                        printk("Couldn't reallocate serial interrupt "
                               "driver!!\n");
                }
        }
 
        return 0;
}
#endif /* CONFIG_COLDFIRE */
 
static int rs_ioctl(struct tty_struct *tty, struct file * file,
                    unsigned int cmd, unsigned long arg)
{
        int error;
        struct async_struct * info = (struct async_struct *)tty->driver_data;
        int retval;
        struct async_icount cprev, cnow;        /* kernel counter temps */
        struct serial_icounter_struct *p_cuser; /* user space */
 
        if (serial_paranoia_check(info, tty->device, "rs_ioctl"))
                return -ENODEV;
 
        if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
            (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD)  &&
            (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT) &&
            (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
                if (tty->flags & (1 << TTY_IO_ERROR))
                    return -EIO;
        }
 
        switch (cmd) {
                case TIOCSBRK:  /* Turn break on, unconditionally */
                        retval = tty_check_change(tty);
                        if (retval)
                                return retval;
                        tty_wait_until_sent(tty, 0);
                        rs_break(info,-1);
                        return 0;
                case TIOCCBRK:  /* Turn break off, unconditionally */
                        retval = tty_check_change(tty);
                        if (retval)
                                return retval;
                        tty_wait_until_sent(tty, 0);
                        rs_break(info,0);
                        return 0;
                case TCSBRK:    /* SVID version: non-zero arg --> no break */
                        retval = tty_check_change(tty);
                        if (retval)
                                return retval;
                        tty_wait_until_sent(tty, 0);
                        if (!arg)
                                send_break(info, HZ/4); /* 1/4 second */
                        return 0;
                case TCSBRKP:   /* support for POSIX tcsendbreak() */
                        retval = tty_check_change(tty);
                        if (retval)
                                return retval;
                        tty_wait_until_sent(tty, 0);
                        send_break(info, arg ? arg*(HZ/10) : HZ/4);
                        return 0;
                case TIOCGSOFTCAR:
                        error = verify_area(VERIFY_WRITE, (void *) arg,sizeof(long));
                        if (error)
                                return error;
                        put_fs_long(C_CLOCAL(tty) ? 1 : 0,
                                    (unsigned long *) arg);
                        return 0;
                case TIOCSSOFTCAR:
                        error = verify_area(VERIFY_READ, (void *) arg,sizeof(long));
                        if (error)
                                return error;
                        arg = get_fs_long((unsigned long *) arg);
                        tty->termios->c_cflag =
                                ((tty->termios->c_cflag & ~CLOCAL) |
                                 (arg ? CLOCAL : 0));
                        return 0;
                case TIOCMGET:
                        error = verify_area(VERIFY_WRITE, (void *) arg,
                                sizeof(unsigned int));
                        if (error)
                                return error;
                        return get_modem_info(info, (unsigned int *) arg);
                case TIOCMBIS:
                case TIOCMBIC:
                case TIOCMSET:
                        return set_modem_info(info, cmd, (unsigned int *) arg);
                case TIOCGSERIAL:
                        error = verify_area(VERIFY_WRITE, (void *) arg,
                                                sizeof(struct serial_struct));
                        if (error)
                                return error;
                        return get_serial_info(info,
                                               (struct serial_struct *) arg);
                case TIOCSSERIAL:
                        error = verify_area(VERIFY_READ, (void *) arg,
                                                sizeof(struct serial_struct));
                        if (error)
                                return error;
                        return set_serial_info(info,
                                               (struct serial_struct *) arg);
                case TIOCSERCONFIG:
                        return do_autoconfig(info);
 
#ifndef CONFIG_COLDFIRE
                case TIOCSERGWILD:
                        error = verify_area(VERIFY_WRITE, (void *) arg,
                                            sizeof(int));
                        if (error)
                                return error;
                        put_fs_long(rs_wild_int_mask, (unsigned long *) arg);
                        return 0;
#endif /* CONFIG_COLDFIRE */
                case TIOCSERGETLSR: /* Get line status register */
                        error = verify_area(VERIFY_WRITE, (void *) arg,
                                sizeof(unsigned int));
                        if (error)
                                return error;
                        else
                            return get_lsr_info(info, (unsigned int *) arg);
#ifndef CONFIG_COLDFIRE
                case TIOCSERSWILD:
                        if (!suser())
                                return -EPERM;
                        error = verify_area(VERIFY_READ, (void *) arg,sizeof(long));
                        if (error)
                                return error;
                        rs_wild_int_mask = get_fs_long((unsigned long *) arg);
                        if (rs_wild_int_mask < 0)
                                rs_wild_int_mask = check_wild_interrupts(0);
#endif /* CONFIG_COLDFIRE */
                        return 0;
 
                case TIOCSERGSTRUCT:
                        error = verify_area(VERIFY_WRITE, (void *) arg,
                                                sizeof(struct async_struct));
                        if (error)
                                return error;
                        memcpy_tofs((struct async_struct *) arg,
                                    info, sizeof(struct async_struct));
                        return 0;
 
#ifndef CONFIG_COLDFIRE
                case TIOCSERGETMULTI:
                        error = verify_area(VERIFY_WRITE, (void *) arg,
                                    sizeof(struct serial_multiport_struct));
                        if (error)
                                return error;
                        return get_multiport_struct(info,
                                       (struct serial_multiport_struct *) arg);
                case TIOCSERSETMULTI:
                        error = verify_area(VERIFY_READ, (void *) arg,
                                    sizeof(struct serial_multiport_struct));
                        if (error)
                                return error;
                        return set_multiport_struct(info,
                                       (struct serial_multiport_struct *) arg);
#endif /* CONFIG_COLDFIRE */
                /*
                 * 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();
                        cprev = info->icount;   /* note the counters on entry */
                        sti();
                        while (1) {
                                interruptible_sleep_on(&info->delta_msr_wait);
                                /* see if a signal did it */
                                if (current->signal & ~current->blocked)
                                        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:
                        error = verify_area(VERIFY_WRITE, (void *) arg,
                                sizeof(struct serial_icounter_struct));
                        if (error)
                                return error;
                        cli();
                        cnow = info->icount;
                        sti();
                        p_cuser = (struct serial_icounter_struct *) arg;
                        put_user(cnow.cts, &p_cuser->cts);
                        put_user(cnow.dsr, &p_cuser->dsr);
                        put_user(cnow.rng, &p_cuser->rng);
                        put_user(cnow.dcd, &p_cuser->dcd);
                        return 0;
 
                default:
                        return -ENOIOCTLCMD;
                }
        return 0;
}
 
static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
{
        struct async_struct *info = (struct async_struct *)tty->driver_data;
 
        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);
 
        if ((old_termios->c_cflag & CRTSCTS) &&
            !(tty->termios->c_cflag & CRTSCTS)) {
                tty->hw_stopped = 0;
                rs_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
}
 
/*
 * ------------------------------------------------------------
 * rs_close()
 *
 * This routine is called when the serial port gets closed.  First, we
 * wait for the last remaining data to be sent.  Then, we unlink its
 * async structure from the interrupt chain if necessary, and we free
 * that IRQ if nothing is left in the chain.
 * ------------------------------------------------------------
 */
static void rs_close(struct tty_struct *tty, struct file * filp)
{
        struct async_struct * info = (struct async_struct *)tty->driver_data;
        unsigned long flags;
        unsigned long timeout;
 
        if (!info || serial_paranoia_check(info, tty->device, "rs_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("rs_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("rs_close: bad serial port count; tty->count is 1, "
                       "info->count is %d\n", info->count);
                info->count = 1;
        }
        if (--info->count < 0) {
                printk("rs_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!
                 */
                timeout = jiffies+HZ;
                while (!(serial_inp(info, UART_LSR) & UART_LSR_TEMT)) {
                        current->state = TASK_INTERRUPTIBLE;
                        current->timeout = jiffies + info->timeout;
                        schedule();
                        if (jiffies > timeout)
                                break;
                }
        }
        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);
}
 
/*
 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
 */
void rs_hangup(struct tty_struct *tty)
{
        struct async_struct * info = (struct async_struct *)tty->driver_data;
 
        if (serial_paranoia_check(info, tty->device, "rs_hangup"))
                return;
 
        rs_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);
}
 
/*
 * ------------------------------------------------------------
 * rs_open() and friends
 * ------------------------------------------------------------
 */
static int block_til_ready(struct tty_struct *tty, struct file * filp,
                           struct async_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
                if (info->flags & ASYNC_HUP_NOTIFY)
                        return -EAGAIN;
                else
                        return -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
         * rs_close() knows when to free things.  We restore it upon
         * exit, either normal or abnormal.
         */
        retval = 0;
        add_wait_queue(&info->open_wait, &wait);
#ifdef SERIAL_DEBUG_OPEN
        printk("block_til_ready before block: ttys%d, count = %d\n",
               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))
                        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 (current->signal & ~current->blocked) {
                        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.
 */
int rs_open(struct tty_struct *tty, struct file * filp)
{
        struct async_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 = rs_table + line;
        if (serial_paranoia_check(info, tty->device, "rs_open"))
                return -ENODEV;
 
#ifdef SERIAL_DEBUG_OPEN
        printk("rs_open %s%d, count = %d\n", tty->driver.name, info->line,
               info->count);
#endif
        info->count++;
        tty->driver_data = info;
        info->tty = tty;
 
        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;
        }
 
        /*
         * 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("rs_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);
        }
 
        info->session = current->session;
        info->pgrp = current->pgrp;
 
#ifdef SERIAL_DEBUG_OPEN
        printk("rs_open ttys%d successful...", info->line);
#endif
        return 0;
}
 
/*
 * ---------------------------------------------------------------------
 * rs_init() and friends
 *
 * rs_init() is called at boot-time to initialize the serial driver.
 * ---------------------------------------------------------------------
 */
 
/*
 * This routine prints out the appropriate serial driver version
 * number, and identifies which options were configured into this
 * driver.
 */
static void show_serial_version(void)
{
        printk(KERN_INFO "%s version %s with", serial_name, serial_version);
#ifdef CONFIG_SERIAL_PCI
  printk(" PCI");
#define SERIAL_OPT
#endif
#ifdef CONFIG_HUB6
        printk(" HUB-6");
#define SERIAL_OPT
#endif
#ifdef SERIAL_OPT
        printk(" enabled\n");
#else
        printk(" no serial options enabled\n");
#endif
#undef SERIAL_OPT
}
 
#ifndef CONFIG_COLDFIRE
/*
 * This routine is called by do_auto_irq(); it attempts to determine
 * which interrupt a serial port is configured to use.  It is not
 * fool-proof, but it works a large part of the time.
 */
static int get_auto_irq(struct async_struct *info)
{
        unsigned char save_MCR, save_IER, save_ICP=0;
        unsigned int ICP=0, port = info->port;
        unsigned long timeout;
 
        /*
         * Enable interrupts and see who answers
         */
        rs_irq_triggered = 0;
        cli();
        save_IER = serial_inp(info, UART_IER);
        save_MCR = serial_inp(info, UART_MCR);
        if (info->flags & ASYNC_FOURPORT)  {
                serial_outp(info, UART_MCR, UART_MCR_DTR | UART_MCR_RTS);
                serial_outp(info, UART_IER, 0x0f);      /* enable all intrs */
                ICP = (port & 0xFE0) | 0x01F;
                save_ICP = inb_p(ICP);
                outb_p(0x80, ICP);
                (void) inb_p(ICP);
        } else {
                serial_outp(info, UART_MCR,
                            UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2);
                serial_outp(info, UART_IER, 0x0f);      /* enable all intrs */
        }
        sti();
        /*
         * Next, clear the interrupt registers.
         */
        (void)serial_inp(info, UART_LSR);
        (void)serial_inp(info, UART_RX);
        (void)serial_inp(info, UART_IIR);
        (void)serial_inp(info, UART_MSR);
 
        timeout = jiffies+2*HZ/100;
        while (timeout >= jiffies) {
                if (rs_irq_triggered)
                        break;
        }
        /*
         * Now check to see if we got any business, and clean up.
         */
        cli();
        serial_outp(info, UART_IER, save_IER);
        serial_outp(info, UART_MCR, save_MCR);
        if (info->flags & ASYNC_FOURPORT)
                outb_p(save_ICP, ICP);
        sti();
        return(rs_irq_triggered);
}
 
/*
 * Calls get_auto_irq() multiple times, to make sure we don't get
 * faked out by random interrupts
 */
static int do_auto_irq(struct async_struct * info)
{
        unsigned                port = info->port;
        int                     irq_lines = 0;
        int                     irq_try_1 = 0, irq_try_2 = 0;
        int                     retries;
        unsigned long flags;
 
        if (!port)
                return 0;
 
        /* Turn on interrupts (they may be off) */
        save_flags(flags); sti();
 
        irq_lines = grab_all_interrupts(rs_wild_int_mask);
 
        for (retries = 0; retries < 5; retries++) {
                if (!irq_try_1)
                        irq_try_1 = get_auto_irq(info);
                if (!irq_try_2)
                        irq_try_2 = get_auto_irq(info);
                if (irq_try_1 && irq_try_2) {
                        if (irq_try_1 == irq_try_2)
                                break;
                        irq_try_1 = irq_try_2 = 0;
                }
        }
        restore_flags(flags);
        free_all_interrupts(irq_lines);
        return (irq_try_1 == irq_try_2) ? irq_try_1 : 0;
}
#endif /* CONFIG_COLDFIRE */
 
/*
 * This routine is called by rs_init() to initialize a specific serial
 * port.  It determines what type of UART chip this serial port is
 * using: 8250, 16450, 16550, 16550A.  The important question is
 * whether or not this UART is a 16550A or not, since this will
 * determine whether or not we can use its FIFO features or not.
 */
static void autoconfig(struct async_struct * info)
{
        unsigned char status1, status2, scratch, scratch2;
        unsigned port = info->port;
        unsigned long flags;
 
        info->type = PORT_UNKNOWN;
 
        if (!port)
                return;
 
        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_inp(info, UART_IER);
        serial_outp(info, UART_IER, 0);
#ifndef CONFIG_COLDFIRE
        outb(0xff, 0x080);
#endif
        scratch2 = serial_inp(info, UART_IER);
        serial_outp(info, UART_IER, scratch);
        if (scratch2) {
                restore_flags(flags);
                return;         /* We failed; there's nothing here */
        }
 
        /*
         * Check to see if a UART is really there.  Certain broken
         * internal modems based on the Rockwell chipset fail this
         * test, because they apparently don't implement the loopback
         * test mode.  So this test is skipped on the COM 1 through
         * COM 4 ports.  This *should* be safe, since no board
         * manufacturer would be stupid enough to design a board
         * that conflicts with COM 1-4 --- we hope!
         */
        if (!(info->flags & ASYNC_SKIP_TEST)) {
                scratch = serial_inp(info, UART_MCR);
                serial_outp(info, UART_MCR, UART_MCR_LOOP | scratch);
                scratch2 = serial_inp(info, UART_MSR);
                serial_outp(info, UART_MCR, UART_MCR_LOOP | 0x0A);
                status1 = serial_inp(info, UART_MSR) & 0xF0;
                serial_outp(info, UART_MCR, scratch);
                serial_outp(info, UART_MSR, scratch2);
                if (status1 != 0x90) {
                        restore_flags(flags);
                        return;
                }
        }
 
        /*
         * If the AUTO_IRQ flag is set, try to do the automatic IRQ
         * detection.
         */
        if (info->flags & ASYNC_AUTO_IRQ)
#ifdef CONFIG_COLDFIRE
                printk("SERIAL: auto-irq not supported\n");
#else
                info->irq = do_auto_irq(info);
#endif
 
        scratch2 = serial_in(info, UART_LCR);
        serial_outp(info, UART_LCR, scratch2 | UART_LCR_DLAB);
        serial_outp(info, UART_EFR, 0);  /* EFR is the same as FCR */
        serial_outp(info, UART_LCR, scratch2);
        serial_outp(info, UART_FCR, UART_FCR_ENABLE_FIFO);
        scratch = serial_in(info, UART_IIR) >> 6;
        info->xmit_fifo_size = 1;
        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:
                        serial_outp(info, UART_LCR, scratch2 | UART_LCR_DLAB);
                        if (serial_in(info, UART_EFR) == 0) {
                                info->type = PORT_16650;
                                info->xmit_fifo_size = 32;
                        } else {
                                info->type = PORT_16550A;
                                info->xmit_fifo_size = 16;
                        }
                        serial_outp(info, UART_LCR, scratch2);
                        break;
        }
        if (info->type == PORT_16450) {
                scratch = serial_in(info, UART_SCR);
                serial_outp(info, UART_SCR, 0xa5);
                status1 = serial_in(info, UART_SCR);
                serial_outp(info, UART_SCR, 0x5a);
                status2 = serial_in(info, UART_SCR);
                serial_outp(info, UART_SCR, scratch);
 
                if ((status1 != 0xa5) || (status2 != 0x5a)) {
                        info->type = PORT_8250;
                }
        }
        request_region(info->port,8,"serial(auto)");
 
        /*
         * Reset the UART.
         */
#if defined(__alpha__) && !defined(CONFIG_PCI)
        /*
         * I wonder what DEC did to the OUT1 and OUT2 lines?
         * clearing them results in endless interrupts.
         */
        serial_outp(info, UART_MCR, 0x0c);
#else
        serial_outp(info, UART_MCR, 0x00);
#endif
        serial_outp(info, UART_FCR, (UART_FCR_CLEAR_RCVR |
                                     UART_FCR_CLEAR_XMIT));
        (void)serial_in(info, UART_RX);
 
        restore_flags(flags);
}
 
void display_uart_type(int type)
{
  switch (type) {
        case PORT_8250:
          printk(" is a 8250\n");
          break;
        case PORT_16450:
          printk(" is a 16450\n");
          break;
        case PORT_16550:
          printk(" is a 16550\n");
          break;
        case PORT_16550A:
          printk(" is a 16550A\n");
          break;
        case PORT_16650:
          printk(" is a 16650\n");
          break;
        default:
          printk("\n");
          break;
  }
}
 
void init_port(struct async_struct *info, int num)
{
  info->magic = SERIAL_MAGIC;
  info->line = num;
  info->tty = 0;
  info->type = PORT_UNKNOWN;
  info->custom_divisor = 0;
  info->close_delay = 5*HZ/10;
  info->closing_wait = 30*HZ;
  info->x_char = 0;
  info->event = 0;
  info->count = 0;
  info->blocked_open = 0;
  info->tqueue.routine = do_softint;
  info->tqueue.data = info;
  info->tqueue_hangup.routine = do_serial_hangup;
  info->tqueue_hangup.data = info;
  info->callout_termios =callout_driver.init_termios;
  info->normal_termios = serial_driver.init_termios;
  info->open_wait = 0;
  info->close_wait = 0;
  info->delta_msr_wait = 0;
  info->icount.cts = info->icount.dsr =
        info->icount.rng = info->icount.dcd = 0;
  info->next_port = 0;
  info->prev_port = 0;
#ifdef CONFIG_COLDFIRE
{
  int retval;
#if defined(CONFIG_NETtel)
  mcf_autovector(info->irq);
#endif
  retval = request_irq(info->irq, rs_interrupt, IRQ_T(info), "serial", NULL);
  if (retval)
    printk("SERIAL: failed to register interrup %d\n", info->irq);
}
#else
/* SIMON */
/*  if (info->irq == 2)
        info->irq = 9;
*/
#endif
 
  if (info->type == PORT_UNKNOWN) {
        if (!(info->flags & ASYNC_BOOT_AUTOCONF))
          return;
        autoconfig(info);
        if (info->type == PORT_UNKNOWN)
          return;
  }
  printk(KERN_INFO "ttyS%02d%s%s at 0x%04x (irq = %d)", info->line,
                 (info->flags & ASYNC_FOURPORT) ? " FourPort" : "",
                 (info->flags & ASYNC_PCI)      ? " PCI" : "",
                 info->port, info->irq);
  display_uart_type(info->type);
}
 
int register_serial(struct serial_struct *req);
void unregister_serial(int line);
 
static struct symbol_table serial_syms = {
#include <linux/symtab_begin.h>
        X(register_serial),
        X(unregister_serial),
#include <linux/symtab_end.h>
};
 
#ifdef CONFIG_SERIAL_PCI
 
/*
 * Query PCI space for known serial boards
 * If found, add them to the PCI device space in rs_table[]
 *
 * Accept a maximum of eight boards
 *
 */
 
static void probe_serial_pci(void)
{
  u16 vendor, device;
  static int pci_index  = 0;
  unsigned char pci_bus, pci_device_fn;
  struct async_struct *pci_boards = &rs_table[PCI_PORT_START];
  unsigned int port_num = 0;
  unsigned int card_num = 0;
 
  u32 device_ioaddr;
  u8  device_irq;
 
  enum pci_spc pci_space        = pci_space_0;
  unsigned int pci_space_offset = 0;
 
 
#ifdef SERIAL_DEBUG_PCI
  printk(KERN_DEBUG "Entered probe_serial_pci()\n");
#endif
 
  if (! pcibios_present()) {
#ifdef SERIAL_DEBUG_PCI
        printk(KERN_DEBUG "Leaving probe_serial_pci() (no pcibios)\n");
#endif
        return;
  }
 
/*
 * Start scanning the PCI bus for serial controllers ...
 *
 */
 
  for (;pci_index < 0xff; pci_index++) {
        int i = 0;
 
        if (pcibios_find_class(PCI_CLASS_COMMUNICATION_SERIAL << 8,
                                                   pci_index,
                                                   &pci_bus,
                                                   &pci_device_fn) != PCIBIOS_SUCCESSFUL)
          break; /* for (; pci_index ... */
 
        pcibios_read_config_word(pci_bus, pci_device_fn, PCI_VENDOR_ID, &vendor);
        pcibios_read_config_word(pci_bus, pci_device_fn, PCI_DEVICE_ID, &device);
 
        for (i = 0; pci_serial_tbl[i].board_name; i++) {
          if (vendor == pci_serial_tbl[i].vendor_id  &&
                  device == pci_serial_tbl[i].device_id)
                break; /* for(i=0... */
        }
 
        if (pci_serial_tbl[i].board_name == 0) {
#ifdef SERIAL_DEBUG_PCI
          printk(KERN_DEBUG "Found Board (%x/%x) (not one of us)\n", vendor, device);
#endif
          continue;        /* Found a serial communication controller but not one we know */
        }
 
/*
 * At this point we found a serial board which we know
 */
 
        if(card_num >= PCI_NR_BOARDS) {
          printk(KERN_ERR "Already %d boards configured, skipping\n", PCI_NR_BOARDS);
          continue; /* for (;pci_index < 0xff */
        }
 
        pcibios_read_config_byte(pci_bus, pci_device_fn,
                                                         PCI_INTERRUPT_LINE, &device_irq);
        pcibios_read_config_dword(pci_bus, pci_device_fn,
                                                          PCI_BASE_ADDRESS_1, &device_ioaddr);
 
#ifdef SERIAL_DEBUG_PCI
                printk(KERN_DEBUG "Device %s at #%x found\n", pci_serial_tbl[i].board_name, device_ioaddr);
#endif
 
        if (check_region(device_ioaddr, pci_serial_tbl[i].io_size)) {
          printk(KERN_ERR "Could not reserve %d bytes of I/O Space at %x\n", pci_serial_tbl[i].io_size, device_ioaddr);
          continue; /* for (;pci_index < 0xff */
        }
 
/*
 * Every PCI device brings 128 bytes (at least) of IO-Space with it
 * reserve a region for it. It is not exactly necessary as PCI will
 * ensure that no other device will be mapped onto this space (LOL)
 * but we do it nevertheless so it will show up nicely on
 * /proc/ioports -- hps
 */
 
          if((device_ioaddr & 1) == 0) {
#ifdef SERIAL_DEBUG_PCI
                device_ioaddr &= ~0x7f;
                printk(KERN_DEBUG "%s has its config registers memory-mapped at #%x (ignoring)\n",
                           pci_serial_tbl[i].board_name, device_ioaddr);
#endif
                continue; /* for (;pci_index < 0xff */
          }
 
        device_ioaddr &= ~0x7f;         /* Mask out the flag bits
                                                                         * from this register. At least on the PLX9050
                                                                         * they're always 0 but this is here nevertheless
                                                                         * for sanity's sake
                                                                         */
 
        request_region(device_ioaddr, pci_serial_tbl[i].io_size, "serial (PCI Controller)");
 
        pci_rs_chips[card_num].start = device_ioaddr;
        pci_rs_chips[card_num].type  = &pci_serial_tbl[i];
 
 
/*
 * Every PCI device can bring up to four PCI memory or IO spaces (at
 * least according to the documentation I have. So we will now check
 * with our config whether this device has one of these spaces and we
 * should configure UARTs inside -- hps
 */
 
        for(; pci_space <= pci_space_3; pci_space <<= 1, pci_space_offset+= 4) {
          u32 uart_chip_base;
          u32 uart_chip_count;
 
          if((pci_serial_tbl[i].pci_space & pci_space) == 0)
                continue; /* for(;pci_space... */
 
          pcibios_read_config_dword(pci_bus, pci_device_fn,
                                                                PCI_BASE_ADDRESS_2+pci_space_offset, &uart_chip_base);
 
          if((uart_chip_base & 1) == 0) {
#ifdef SERIAL_DEBUG_PCI
                chip_base &= ~0x0f;
                printk(KERN_DEBUG "%s has a memory-mapped IO Chip at #%x (ignoring)\n",
                           pci_serial_tbl[i].board_name, chip_base);
#endif
                continue; /* for(;pci_space... */
          }
 
          uart_chip_base &= ~0x0f;
 
/*
 * uart_chip_base now points to the IO-Space.
 *
 * Alvin Sim <alvin@alloycp.com.au> told me the following thing:
 *
 * UARTS can be "setserial"d by kernel 2.0.35, but ports needed to be
 * manually specified. 4 ports start at 0x6100, in increments of 8
 * addresses.
 *
 * so there is at least one board out there which can do more than one
 * UART in a single PCI config space. My trustworthy SPCom 200 PCI has
 * just one UART in one config space. So I added a check for more than
 * one chip in a config space -- hps
 *
 */
 
          for(uart_chip_count=0;uart_chip_count < pci_serial_tbl[i].dev_per_space; uart_chip_count++) {
#ifdef SERIAL_DEBUG_PCI
                printk(KERN_DEBUG "%s has an IO Chip at #%x\n",
                           pci_serial_tbl[i].board_name, uart_chip_base);
#endif
 
                if(port_num >= PCI_NR_PORTS) {
                  printk(KERN_ERR "Already %d ports configured, skipping\n", PCI_NR_PORTS);
                  break; /* for(;uart_chip_count... */
                }
 
                if (check_region(uart_chip_base, 8)) {
                  printk(KERN_ERR "Could not reserve %d bytes of I/O Space at %x\n", 8, uart_chip_base);
                  break; /* for(;uart_chip_count... */
                }
 
                request_region(uart_chip_base, 8, "serial (PCI)");
                pci_boards[port_num].port  = uart_chip_base;
                pci_boards[port_num].irq   = device_irq;
                pci_boards[port_num].flags = PCI_FLAGS;
                pci_boards[port_num].baud_base = pci_serial_tbl[i].baud_base;
 
                port_num++;
                uart_chip_base += pci_serial_tbl[i].dev_spacing;
 
          }  /* for(uart_chip_count... */
        } /* for(pci_space ... */
 
        card_num++;
  }  /* for */
 
#ifdef SERIAL_DEBUG_PCI
  printk(KERN_DEBUG "Leaving probe_serial_pci() (probe finished)\n");
#endif
  return;
}
 
#endif /* CONFIG_SERIAL_PCI */
 
/*
 * The serial driver boot-time initialization code!
 */
 
int rs_init(void)
{
        int i;
        struct async_struct * info;
 
        init_bh(SERIAL_BH, do_serial_bh);
        timer_table[RS_TIMER].fn = rs_timer;
        timer_table[RS_TIMER].expires = 0;
#ifdef CONFIG_AUTO_IRQ
        rs_wild_int_mask = check_wild_interrupts(1);
#endif
 
        for (i = 0; i < 16; i++) {
                IRQ_ports[IRQMASK(i)] = 0;
                IRQ_timeout[IRQMASK(i)] = 0;
                memset(&rs_multiport[IRQMASK(i)], 0, sizeof(struct rs_multiport_struct));
        }
 
        show_serial_version();
#ifdef CONFIG_SERIAL_PCI
                probe_serial_pci();
#endif  
 
        /* Initialize the tty_driver structure */
 
        memset(&serial_driver, 0, sizeof(struct tty_driver));
        serial_driver.magic = TTY_DRIVER_MAGIC;
        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 =
                B115200 | CS8 | CREAD | HUPCL | CLOCAL;
        serial_driver.flags = TTY_DRIVER_REAL_RAW;
        serial_driver.refcount = &serial_refcount;
        serial_driver.table = serial_table;
        serial_driver.termios = serial_termios;
        serial_driver.termios_locked = serial_termios_locked;
 
        serial_driver.open = rs_open;
        serial_driver.close = rs_close;
        serial_driver.write = rs_write;
        serial_driver.put_char = rs_put_char;
        serial_driver.flush_chars = rs_flush_chars;
        serial_driver.write_room = rs_write_room;
        serial_driver.chars_in_buffer = rs_chars_in_buffer;
        serial_driver.flush_buffer = rs_flush_buffer;
        serial_driver.ioctl = rs_ioctl;
        serial_driver.throttle = rs_throttle;
        serial_driver.unthrottle = rs_unthrottle;
        serial_driver.set_termios = rs_set_termios;
        serial_driver.stop = rs_stop;
        serial_driver.start = rs_start;
        serial_driver.hangup = rs_hangup;
 
        /*
         * 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;
 
        if (tty_register_driver(&serial_driver))
                panic("Couldn't register serial driver\n");
        if (tty_register_driver(&callout_driver))
                panic("Couldn't register callout driver\n");
 
        for (i = 0, info = rs_table; i < NR_PORTS; i++,info++) {
                                init_port(info, i);
                };
 
        register_symtab(&serial_syms);
        return 0;
}
 
 
 
/*
 * register_serial and unregister_serial allows for serial ports to be
 * configured at run-time, to support PCMCIA modems.
 */
int register_serial(struct serial_struct *req)
{
        int i;
        unsigned long flags;
        struct async_struct *info;
 
        save_flags(flags);
        cli();
        for (i = 0; i < NR_PORTS; i++) {
                if (rs_table[i].port == req->port)
                        break;
        }
        if (i == NR_PORTS) {
                for (i = 0; i < NR_PORTS; i++)
                        if ((rs_table[i].type == PORT_UNKNOWN) &&
                            (rs_table[i].count == 0))
                                break;
        }
        if (i == NR_PORTS) {
                restore_flags(flags);
                return -1;
        }
        info = &rs_table[i];
        if (rs_table[i].count) {
                restore_flags(flags);
                printk("Couldn't configure serial #%d (port=%d,irq=%d): "
                       "device already open\n", i, req->port, req->irq);
                return -1;
        }
        info->irq = req->irq;
        info->port = req->port;
        info->flags = req->flags;
        autoconfig(info);
        if (info->type == PORT_UNKNOWN) {
                restore_flags(flags);
                printk("register_serial(): autoconfig failed\n");
                return -1;
        }
                printk(KERN_INFO "ttyS%02d at 0x%04x (irq = %d)", info->line,
               info->port, info->irq);
                display_uart_type(info->type);
        restore_flags(flags);
        return info->line;
}
 
void unregister_serial(int line)
{
        unsigned long flags;
        struct async_struct *info = &rs_table[line];
 
        save_flags(flags);
        cli();
        if (info->tty)
                tty_hangup(info->tty);
        info->type = PORT_UNKNOWN;
                printk(KERN_INFO "ttyS%02d unloaded\n", info->line);
        restore_flags(flags);
}
 
#ifdef MODULE
int init_module(void)
{
        return rs_init();
}
 
void cleanup_module(void)
{
        unsigned long flags;
        int e1, e2;
        int i;
 
        /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
        save_flags(flags);
        cli();
        timer_active &= ~(1 << RS_TIMER);
        timer_table[RS_TIMER].fn = NULL;
        timer_table[RS_TIMER].expires = 0;
        if ((e1 = tty_unregister_driver(&serial_driver)))
                printk("SERIAL: failed to unregister serial driver (%d)\n",
                       e1);
        if ((e2 = tty_unregister_driver(&callout_driver)))
                printk("SERIAL: failed to unregister callout driver (%d)\n",
                       e2);
        restore_flags(flags);
 
        for (i = 0; i < NR_PORTS; i++) {
                if (rs_table[i].type != PORT_UNKNOWN)
                        release_region(rs_table[i].port, 8);
        }
 
#ifdef CONFIG_SERIAL_PCI
                for (i = 0; i < PCI_NR_BOARDS; i++) {
                  if (pci_rs_chips[i].start != 0x0) {
#ifdef SERIAL_DEBUG_PCI
                        printk(KERN_DEBUG "Releasing %d Bytes at #%x\n", pci_rs_chips[i].type->io_size, pci_rs_chips[i].start);
#endif
                        release_region(pci_rs_chips[i].start, pci_rs_chips[i].type->io_size);
                  }
                }
#endif
 
        if (tmp_buf) {
                free_page((unsigned long) tmp_buf);
                tmp_buf = NULL;
        }
}
#endif /* MODULE */
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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [drivers/] [char/] [serial.c] - Blame information for rev 1262

Line No.	Rev	Author	Line
1	199	simons	`/*`
2			`* linux/drivers/char/serial.c`
3			`*`
4			`* Copyright (C) 1991, 1992 Linus Torvalds`
5			`*`
6			`* Extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92. Now`
7			`* much more extensible to support other serial cards based on the`
8			`* 16450/16550A UART's. Added support for the AST FourPort and the`
9			`* Accent Async board.`
10			`*`
11			`* set_serial_info fixed to set the flags, custom divisor, and uart`
12			`* type fields. Fix suggested by Michael K. Johnson 12/12/92.`
13			`*`
14			`* 11/95: TIOCMIWAIT, TIOCGICOUNT by Angelo Haritsis <ah@doc.ic.ac.uk>`
15			`*`
16			`* 03/96: Modularised by Angelo Haritsis <ah@doc.ic.ac.uk>`
17			`*`
18			`* rs_set_termios fixed to look also for changes of the input`
19			`* flags INPCK, BRKINT, PARMRK, IGNPAR and IGNBRK.`
20			`* Bernd Anh�upl 05/17/96.`
21			`*`
22			`* Added Support for PCI serial boards which contain 16x50 Chips`
23			`* 31.10.1998 Henning P. Schmiedehausen <hps@tanstaafl.de>`
24			`*`
25			`* This module exports the following rs232 io functions:`
26			`*`
27			`* int rs_init(void);`
28			`* int rs_open(struct tty_struct * tty, struct file * filp)`
29			`*/`
30
31			`#include <linux/module.h>`
32			`#include <linux/errno.h>`
33			`#include <linux/signal.h>`
34			`#include <linux/sched.h>`
35			`#include <linux/timer.h>`
36			`#include <linux/interrupt.h>`
37			`#include <linux/tty.h>`
38			`#include <linux/tty_flip.h>`
39			`#include <linux/serial.h>`
40			`#include <linux/serial_reg.h>`