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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [char/] [serial.c] - Blame information for rev 1774

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/*
 *  linux/drivers/char/serial.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *  Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
 *              1998, 1999  Theodore Ts'o
 *
 *  Extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92.  Now
 *  much more extensible to support other serial cards based on the
 *  16450/16550A UART's.  Added support for the AST FourPort and the
 *  Accent Async board.
 *
 *  set_serial_info fixed to set the flags, custom divisor, and uart
 *      type fields.  Fix suggested by Michael K. Johnson 12/12/92.
 *
 *  11/95: TIOCMIWAIT, TIOCGICOUNT by Angelo Haritsis <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.
 *
 *  1/97:  Extended dumb serial ports are a config option now.
 *         Saves 4k.   Michael A. Griffith <grif@acm.org>
 *
 *  8/97: Fix bug in rs_set_termios with RTS
 *        Stanislav V. Voronyi <stas@uanet.kharkov.ua>
 *
 *  3/98: Change the IRQ detection, use of probe_irq_o*(),
 *        suppress TIOCSERGWILD and TIOCSERSWILD
 *        Etienne Lorrain <etienne.lorrain@ibm.net>
 *
 *  4/98: Added changes to support the ARM architecture proposed by
 *        Russell King
 *
 *  5/99: Updated to include support for the XR16C850 and ST16C654
 *        uarts.  Stuart MacDonald <stuartm@connecttech.com>
 *
 *  8/99: Generalized PCI support added.  Theodore Ts'o
 *
 *  3/00: Rid circular buffer of redundant xmit_cnt.  Fix a
 *        few races on freeing buffers too.
 *        Alan Modra <alan@linuxcare.com>
 *
 *  5/00: Support for the RSA-DV II/S card added.
 *        Kiyokazu SUTO <suto@ks-and-ks.ne.jp>
 *
 *  6/00: Remove old-style timer, use timer_list
 *        Andrew Morton <andrewm@uow.edu.au>
 *
 *  7/00: Support Timedia/Sunix/Exsys PCI cards
 *
 *  7/00: fix some returns on failure not using MOD_DEC_USE_COUNT.
 *        Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 *
 * 10/00: add in optional software flow control for serial console.
 *        Kanoj Sarcar <kanoj@sgi.com>  (Modified by Theodore Ts'o)
 *
 * 02/02: Fix for AMD Elan bug in transmit irq routine, by
 *        Christer Weinigel <wingel@hog.ctrl-c.liu.se>,
 *        Robert Schwebel <robert@schwebel.de>,
 *        Juergen Beisert <jbeisert@eurodsn.de>,
 *        Theodore Ts'o <tytso@mit.edu>
 */
 
static char *serial_version = "5.05c";
static char *serial_revdate = "2001-07-08";
 
/*
 * Serial driver configuration section.  Here are the various options:
 *
 * CONFIG_HUB6
 *              Enables support for the venerable Bell Technologies
 *              HUB6 card.
 *
 * CONFIG_SERIAL_MANY_PORTS
 *              Enables support for ports beyond the standard, stupid
 *              COM 1/2/3/4.
 *
 * CONFIG_SERIAL_MULTIPORT
 *              Enables support for special multiport board support.
 *
 * CONFIG_SERIAL_SHARE_IRQ
 *              Enables support for multiple serial ports on one IRQ
 *
 * CONFIG_SERIAL_DETECT_IRQ
 *              Enable the autodetection of IRQ on standart ports
 *
 * SERIAL_PARANOIA_CHECK
 *              Check the magic number for the async_structure where
 *              ever possible.
 *
 * CONFIG_SERIAL_ACPI
 *              Enable support for serial console port and serial
 *              debug port as defined by the SPCR and DBGP tables in
 *              ACPI 2.0.
 */
 
#include <linux/config.h>
#include <linux/version.h>
 
#undef SERIAL_PARANOIA_CHECK
#define CONFIG_SERIAL_NOPAUSE_IO
#define SERIAL_DO_RESTART
 
#if 0
/* These defines are normally controlled by the autoconf.h */
#define CONFIG_SERIAL_MANY_PORTS
#define CONFIG_SERIAL_SHARE_IRQ
#define CONFIG_SERIAL_DETECT_IRQ
#define CONFIG_SERIAL_MULTIPORT
#define CONFIG_HUB6
#endif
 
#ifdef CONFIG_PCI
#define ENABLE_SERIAL_PCI
#ifndef CONFIG_SERIAL_SHARE_IRQ
#define CONFIG_SERIAL_SHARE_IRQ
#endif
#ifndef CONFIG_SERIAL_MANY_PORTS
#define CONFIG_SERIAL_MANY_PORTS
#endif
#endif
 
#ifdef CONFIG_SERIAL_ACPI
#define ENABLE_SERIAL_ACPI
#endif
 
#if defined(CONFIG_ISAPNP)|| (defined(CONFIG_ISAPNP_MODULE) && defined(MODULE))
#ifndef ENABLE_SERIAL_PNP
#define ENABLE_SERIAL_PNP
#endif
#endif
 
/* Set of debugging defines */
 
#undef SERIAL_DEBUG_INTR
#undef SERIAL_DEBUG_OPEN
#undef SERIAL_DEBUG_FLOW
#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
#undef SERIAL_DEBUG_PCI
#undef SERIAL_DEBUG_AUTOCONF
 
/* Sanity checks */
 
#ifdef CONFIG_SERIAL_MULTIPORT
#ifndef CONFIG_SERIAL_SHARE_IRQ
#define CONFIG_SERIAL_SHARE_IRQ
#endif
#endif
 
#ifdef CONFIG_HUB6
#ifndef CONFIG_SERIAL_MANY_PORTS
#define CONFIG_SERIAL_MANY_PORTS
#endif
#ifndef CONFIG_SERIAL_SHARE_IRQ
#define CONFIG_SERIAL_SHARE_IRQ
#endif
#endif
 
#ifdef MODULE
#undef CONFIG_SERIAL_CONSOLE
#endif
 
#define CONFIG_SERIAL_RSA
 
#define RS_STROBE_TIME (10*HZ)
#define RS_ISR_PASS_LIMIT 256
 
#if defined(__i386__) && (defined(CONFIG_M386) || defined(CONFIG_M486))
#define SERIAL_INLINE
#endif
 
/*
 * End of serial driver configuration section.
 */
 
#include <linux/module.h>
 
#include <linux/types.h>
#ifdef LOCAL_HEADERS
#include "serial_local.h"
#else
#include <linux/serial.h>
#include <linux/serialP.h>
#include <linux/serial_reg.h>
#include <asm/serial.h>
#define LOCAL_VERSTRING ""
#endif
 
#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/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/slab.h>
#if (LINUX_VERSION_CODE >= 131343)
#include <linux/init.h>
#endif
#if (LINUX_VERSION_CODE >= 131336)
#include <asm/uaccess.h>
#endif
#include <linux/delay.h>
#ifdef CONFIG_SERIAL_CONSOLE
#include <linux/console.h>
#endif
#ifdef ENABLE_SERIAL_PCI
#include <linux/pci.h>
#endif
#ifdef ENABLE_SERIAL_PNP
#include <linux/isapnp.h>
#endif
#ifdef CONFIG_MAGIC_SYSRQ
#include <linux/sysrq.h>
#endif
 
/*
 * All of the compatibilty code so we can compile serial.c against
 * older kernels is hidden in serial_compat.h
 */
#if defined(LOCAL_HEADERS) || (LINUX_VERSION_CODE < 0x020317) /* 2.3.23 */
#include "serial_compat.h"
#endif
 
#include <asm/system.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/bitops.h>
 
#if defined(CONFIG_MAC_SERIAL)
#define SERIAL_DEV_OFFSET       ((_machine == _MACH_prep || _machine == _MACH_chrp) ? 0 : 2)
#else
#define SERIAL_DEV_OFFSET       0
#endif
 
#ifdef SERIAL_INLINE
#define _INLINE_ inline
#else
#define _INLINE_
#endif
 
static char *serial_name = "Serial driver";
 
static DECLARE_TASK_QUEUE(tq_serial);
 
static struct tty_driver serial_driver, callout_driver;
static int serial_refcount;
 
static struct timer_list serial_timer;
 
/* serial subtype definitions */
#ifndef SERIAL_TYPE_NORMAL
#define SERIAL_TYPE_NORMAL      1
#define SERIAL_TYPE_CALLOUT     2
#endif
 
/* number of characters left in xmit buffer before we ask for more */
#define WAKEUP_CHARS 256
 
/*
 * IRQ_timeout          - How long the timeout should be for each IRQ
 *                              should be after the IRQ has been active.
 */
 
static struct async_struct *IRQ_ports[NR_IRQS];
#ifdef CONFIG_SERIAL_MULTIPORT
static struct rs_multiport_struct rs_multiport[NR_IRQS];
#endif
static int IRQ_timeout[NR_IRQS];
#ifdef CONFIG_SERIAL_CONSOLE
static struct console sercons;
static int lsr_break_flag;
#endif
#if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
static unsigned long break_pressed; /* break, really ... */
#endif
 
static unsigned detect_uart_irq (struct serial_state * state);
static void autoconfig(struct serial_state * state);
static void change_speed(struct async_struct *info, struct termios *old);
static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
 
/*
 * Here we define the default xmit fifo size used for each type of
 * UART
 */
static struct serial_uart_config uart_config[] = {
        { "unknown", 1, 0 },
        { "8250", 1, 0 },
        { "16450", 1, 0 },
        { "16550", 1, 0 },
        { "16550A", 16, UART_CLEAR_FIFO | UART_USE_FIFO },
        { "cirrus", 1, 0 },      /* usurped by cyclades.c */
        { "ST16650", 1, UART_CLEAR_FIFO | UART_STARTECH },
        { "ST16650V2", 32, UART_CLEAR_FIFO | UART_USE_FIFO |
                  UART_STARTECH },
        { "TI16750", 64, UART_CLEAR_FIFO | UART_USE_FIFO},
        { "Startech", 1, 0},     /* usurped by cyclades.c */
        { "16C950/954", 128, UART_CLEAR_FIFO | UART_USE_FIFO},
        { "ST16654", 64, UART_CLEAR_FIFO | UART_USE_FIFO |
                  UART_STARTECH },
        { "XR16850", 128, UART_CLEAR_FIFO | UART_USE_FIFO |
                  UART_STARTECH },
        { "RSA", 2048, UART_CLEAR_FIFO | UART_USE_FIFO },
        { 0, 0}
};
 
#if defined(CONFIG_SERIAL_RSA) && defined(MODULE)
 
#define PORT_RSA_MAX 4
static int probe_rsa[PORT_RSA_MAX];
static int force_rsa[PORT_RSA_MAX];
 
MODULE_PARM(probe_rsa, "1-" __MODULE_STRING(PORT_RSA_MAX) "i");
MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA");
MODULE_PARM(force_rsa, "1-" __MODULE_STRING(PORT_RSA_MAX) "i");
MODULE_PARM_DESC(force_rsa, "Force I/O ports for RSA");
#endif /* CONFIG_SERIAL_RSA  */
 
struct serial_state rs_table[RS_TABLE_SIZE] = {
        SERIAL_PORT_DFNS        /* Defined in serial.h */
};
 
#define NR_PORTS        (sizeof(rs_table)/sizeof(struct serial_state))
int serial_nr_ports = NR_PORTS;
 
#if (defined(ENABLE_SERIAL_PCI) || defined(ENABLE_SERIAL_PNP))
#define NR_PCI_BOARDS   8
 
static struct pci_board_inst    serial_pci_board[NR_PCI_BOARDS];
 
#ifndef IS_PCI_REGION_IOPORT
#define IS_PCI_REGION_IOPORT(dev, r) (pci_resource_flags((dev), (r)) & \
                                      IORESOURCE_IO)
#endif
#ifndef IS_PCI_REGION_IOMEM
#define IS_PCI_REGION_IOMEM(dev, r) (pci_resource_flags((dev), (r)) & \
                                      IORESOURCE_MEM)
#endif
#ifndef PCI_IRQ_RESOURCE
#define PCI_IRQ_RESOURCE(dev, r) ((dev)->irq_resource[r].start)
#endif
#ifndef pci_get_subvendor
#define pci_get_subvendor(dev) ((dev)->subsystem_vendor)
#define pci_get_subdevice(dev)  ((dev)->subsystem_device)
#endif
#endif  /* ENABLE_SERIAL_PCI || ENABLE_SERIAL_PNP  */
 
#ifndef PREPARE_FUNC
#define PREPARE_FUNC(dev)  (dev->prepare)
#define ACTIVATE_FUNC(dev)  (dev->activate)
#define DEACTIVATE_FUNC(dev)  (dev->deactivate)
#endif
 
#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
 
static struct tty_struct *serial_table[NR_PORTS];
static struct termios *serial_termios[NR_PORTS];
static struct termios *serial_termios_locked[NR_PORTS];
 
 
#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
 kdevname(tty->device), (info->flags), serial_refcount,info->count,tty->count,s)
#else
#define DBG_CNT(s)
#endif
 
/*
 * tmp_buf is used as a temporary buffer by serial_write.  We need to
 * lock it in case the copy_from_user blocks while swapping in a page,
 * and some other program tries to do a serial write at the same time.
 * Since the lock will only come under contention when the system is
 * swapping and available memory is low, it makes sense to share one
 * buffer across all the serial ports, since it significantly saves
 * memory if large numbers of serial ports are open.
 */
static unsigned char *tmp_buf;
#ifdef DECLARE_MUTEX
static DECLARE_MUTEX(tmp_buf_sem);
#else
static struct semaphore tmp_buf_sem = MUTEX;
#endif
 
 
static inline int serial_paranoia_check(struct async_struct *info,
                                        kdev_t device, const char *routine)
{
#ifdef SERIAL_PARANOIA_CHECK
        static const char *badmagic =
                "Warning: bad magic number for serial struct (%s) in %s\n";
        static const char *badinfo =
                "Warning: null async_struct for (%s) in %s\n";
 
        if (!info) {
                printk(badinfo, kdevname(device), routine);
                return 1;
        }
        if (info->magic != SERIAL_MAGIC) {
                printk(badmagic, kdevname(device), routine);
                return 1;
        }
#endif
        return 0;
}
 
static _INLINE_ unsigned int serial_in(struct async_struct *info, int offset)
{
        switch (info->io_type) {
#ifdef CONFIG_HUB6
        case SERIAL_IO_HUB6:
                outb(info->hub6 - 1 + offset, info->port);
                return inb(info->port+1);
#endif
        case SERIAL_IO_MEM:
                return readb((unsigned long) info->iomem_base +
                             (offset<<info->iomem_reg_shift));
        default:
                return inb(info->port + offset);
        }
}
 
static _INLINE_ void serial_out(struct async_struct *info, int offset,
                                int value)
{
        switch (info->io_type) {
#ifdef CONFIG_HUB6
        case SERIAL_IO_HUB6:
                outb(info->hub6 - 1 + offset, info->port);
                outb(value, info->port+1);
                break;
#endif
        case SERIAL_IO_MEM:
                writeb(value, (unsigned long) info->iomem_base +
                              (offset<<info->iomem_reg_shift));
                break;
        default:
                outb(value, info->port+offset);
        }
}
 
/*
 * We used to support using pause I/O for certain machines.  We
 * haven't supported this for a while, but just in case it's badly
 * needed for certain old 386 machines, I've left these #define's
 * in....
 */
#define serial_inp(info, offset)                serial_in(info, offset)
#define serial_outp(info, offset, value)        serial_out(info, offset, value)
 
 
/*
 * For the 16C950
 */
void serial_icr_write(struct async_struct *info, int offset, int  value)
{
        serial_out(info, UART_SCR, offset);
        serial_out(info, UART_ICR, value);
}
 
unsigned int serial_icr_read(struct async_struct *info, int offset)
{
        int     value;
 
        serial_icr_write(info, UART_ACR, info->ACR | UART_ACR_ICRRD);
        serial_out(info, UART_SCR, offset);
        value = serial_in(info, UART_ICR);
        serial_icr_write(info, UART_ACR, info->ACR);
        return value;
}
 
/*
 * ------------------------------------------------------------
 * rs_stop() and rs_start()
 *
 * This routines are called before setting or resetting tty->stopped.
 * They enable or disable transmitter interrupts, as necessary.
 * ------------------------------------------------------------
 */
static void rs_stop(struct tty_struct *tty)
{
        struct async_struct *info = (struct async_struct *)tty->driver_data;
        unsigned long flags;
 
        if (serial_paranoia_check(info, tty->device, "rs_stop"))
                return;
 
        save_flags(flags); cli();
        if (info->IER & UART_IER_THRI) {
                info->IER &= ~UART_IER_THRI;
                serial_out(info, UART_IER, info->IER);
        }
        if (info->state->type == PORT_16C950) {
                info->ACR |= UART_ACR_TXDIS;
                serial_icr_write(info, UART_ACR, info->ACR);
        }
        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.head != info->xmit.tail
            && info->xmit.buf
            && !(info->IER & UART_IER_THRI)) {
                info->IER |= UART_IER_THRI;
                serial_out(info, UART_IER, info->IER);
        }
        if (info->state->type == PORT_16C950) {
                info->ACR &= ~UART_ACR_TXDIS;
                serial_icr_write(info, UART_ACR, info->ACR);
        }
        restore_flags(flags);
}
 
/*
 * ----------------------------------------------------------------------
 *
 * Here starts the interrupt handling routines.  All of the following
 * subroutines are declared as inline and are folded into
 * rs_interrupt().  They were separated out for readability's sake.
 *
 * Note: rs_interrupt() is a "fast" interrupt, which means that it
 * runs with interrupts turned off.  People who may want to modify
 * rs_interrupt() should try to keep the interrupt handler as fast as
 * possible.  After you are done making modifications, it is not a bad
 * idea to do:
 *
 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
 *
 * and look at the resulting assemble code in serial.s.
 *
 *                              - Ted Ts'o (tytso@mit.edu), 7-Mar-93
 * -----------------------------------------------------------------------
 */
 
/*
 * This routine is used by the interrupt handler to schedule
 * processing in the software interrupt portion of the driver.
 */
static _INLINE_ void rs_sched_event(struct async_struct *info,
                                  int event)
{
        info->event |= 1 << event;
        queue_task(&info->tqueue, &tq_serial);
        mark_bh(SERIAL_BH);
}
 
static _INLINE_ void receive_chars(struct async_struct *info,
                                 int *status, struct pt_regs * regs)
{
        struct tty_struct *tty = info->tty;
        unsigned char ch;
        struct  async_icount *icount;
        int     max_count = 256;
 
        icount = &info->state->icount;
        do {
                if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
                        tty->flip.tqueue.routine((void *) tty);
                        if (tty->flip.count >= TTY_FLIPBUF_SIZE)
                                return;         // if TTY_DONT_FLIP is set
                }
                ch = serial_inp(info, UART_RX);
                *tty->flip.char_buf_ptr = ch;
                icount->rx++;
 
#ifdef SERIAL_DEBUG_INTR
                printk("DR%02x:%02x...", ch, *status);
#endif
                *tty->flip.flag_buf_ptr = 0;
                if (*status & (UART_LSR_BI | UART_LSR_PE |
                               UART_LSR_FE | UART_LSR_OE)) {
                        /*
                         * For statistics only
                         */
                        if (*status & UART_LSR_BI) {
                                *status &= ~(UART_LSR_FE | UART_LSR_PE);
                                icount->brk++;
                                /*
                                 * We do the SysRQ and SAK checking
                                 * here because otherwise the break
                                 * may get masked by ignore_status_mask
                                 * or read_status_mask.
                                 */
#if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
                                if (info->line == sercons.index) {
                                        if (!break_pressed) {
                                                break_pressed = jiffies;
                                                goto ignore_char;
                                        }
                                        break_pressed = 0;
                                }
#endif
                                if (info->flags & ASYNC_SAK)
                                        do_SAK(tty);
                        } else if (*status & UART_LSR_PE)
                                icount->parity++;
                        else if (*status & UART_LSR_FE)
                                icount->frame++;
                        if (*status & UART_LSR_OE)
                                icount->overrun++;
 
                        /*
                         * Mask off conditions which should be ignored.
                         */
                        *status &= info->read_status_mask;
 
#ifdef CONFIG_SERIAL_CONSOLE
                        if (info->line == sercons.index) {
                                /* Recover the break flag from console xmit */
                                *status |= lsr_break_flag;
                                lsr_break_flag = 0;
                        }
#endif
                        if (*status & (UART_LSR_BI)) {
#ifdef SERIAL_DEBUG_INTR
                                printk("handling break....");
#endif
                                *tty->flip.flag_buf_ptr = TTY_BREAK;
                        } else if (*status & UART_LSR_PE)
                                *tty->flip.flag_buf_ptr = TTY_PARITY;
                        else if (*status & UART_LSR_FE)
                                *tty->flip.flag_buf_ptr = TTY_FRAME;
                }
#if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
                if (break_pressed && info->line == sercons.index) {
                        if (ch != 0 &&
                            time_before(jiffies, break_pressed + HZ*5)) {
                                handle_sysrq(ch, regs, NULL, NULL);
                                break_pressed = 0;
                                goto ignore_char;
                        }
                        break_pressed = 0;
                }
#endif
                if ((*status & info->ignore_status_mask) == 0) {
                        tty->flip.flag_buf_ptr++;
                        tty->flip.char_buf_ptr++;
                        tty->flip.count++;
                }
                if ((*status & UART_LSR_OE) &&
                    (tty->flip.count < TTY_FLIPBUF_SIZE)) {
                        /*
                         * Overrun is special, since it's reported
                         * immediately, and doesn't affect the current
                         * character
                         */
                        *tty->flip.flag_buf_ptr = TTY_OVERRUN;
                        tty->flip.count++;
                        tty->flip.flag_buf_ptr++;
                        tty->flip.char_buf_ptr++;
                }
#if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
        ignore_char:
#endif
                *status = serial_inp(info, UART_LSR);
        } while ((*status & UART_LSR_DR) && (max_count-- > 0));
#if (LINUX_VERSION_CODE > 131394) /* 2.1.66 */
        tty_flip_buffer_push(tty);
#else
        queue_task_irq_off(&tty->flip.tqueue, &tq_timer);
#endif  
}
 
static _INLINE_ void transmit_chars(struct async_struct *info, int *intr_done)
{
        int count;
 
        if (info->x_char) {
                serial_outp(info, UART_TX, info->x_char);
                info->state->icount.tx++;
                info->x_char = 0;
                if (intr_done)
                        *intr_done = 0;
                return;
        }
        if (info->xmit.head == info->xmit.tail
            || info->tty->stopped
            || info->tty->hw_stopped) {
                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 + 1) & (SERIAL_XMIT_SIZE-1);
                info->state->icount.tx++;
                if (info->xmit.head == info->xmit.tail)
                        break;
        } while (--count > 0);
 
        if (CIRC_CNT(info->xmit.head,
                     info->xmit.tail,
                     SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
                rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
 
#ifdef SERIAL_DEBUG_INTR
        printk("THRE...");
#endif
        if (intr_done)
                *intr_done = 0;
 
        if (info->xmit.head == info->xmit.tail) {
                info->IER &= ~UART_IER_THRI;
                serial_out(info, UART_IER, info->IER);
        }
}
 
static _INLINE_ void check_modem_status(struct async_struct *info)
{
        int     status;
        struct  async_icount *icount;
 
        status = serial_in(info, UART_MSR);
 
        if (status & UART_MSR_ANY_DELTA) {
                icount = &info->state->icount;
                /* update input line counters */
                if (status & UART_MSR_TERI)
                        icount->rng++;
                if (status & UART_MSR_DDSR)
                        icount->dsr++;
                if (status & UART_MSR_DDCD) {
                        icount->dcd++;
#ifdef CONFIG_HARD_PPS
                        if ((info->flags & ASYNC_HARDPPS_CD) &&
                            (status & UART_MSR_DCD))
                                hardpps();
#endif
                }
                if (status & UART_MSR_DCTS)
                        icount->cts++;
                wake_up_interruptible(&info->delta_msr_wait);
        }
 
        if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
                printk("ttys%d CD now %s...", info->line,
                       (status & UART_MSR_DCD) ? "on" : "off");
#endif          
                if (status & UART_MSR_DCD)
                        wake_up_interruptible(&info->open_wait);
                else if (!((info->flags & ASYNC_CALLOUT_ACTIVE) &&
                           (info->flags & ASYNC_CALLOUT_NOHUP))) {
#ifdef SERIAL_DEBUG_OPEN
                        printk("doing serial hangup...");
#endif
                        if (info->tty)
                                tty_hangup(info->tty);
                }
        }
        if (info->flags & ASYNC_CTS_FLOW) {
                if (info->tty->hw_stopped) {
                        if (status & UART_MSR_CTS) {
#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
                                printk("CTS tx start...");
#endif
                                info->tty->hw_stopped = 0;
                                info->IER |= UART_IER_THRI;
                                serial_out(info, UART_IER, info->IER);
                                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);
                        }
                }
        }
}
 
#ifdef CONFIG_SERIAL_SHARE_IRQ
/*
 * This is the serial driver's generic interrupt routine
 */
static void rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
{
        int status, iir;
        struct async_struct * info;
        int pass_counter = 0;
        struct async_struct *end_mark = 0;
#ifdef CONFIG_SERIAL_MULTIPORT  
        int first_multi = 0;
        struct rs_multiport_struct *multi;
#endif
 
#ifdef SERIAL_DEBUG_INTR
        printk("rs_interrupt(%d)...", irq);
#endif
 
        info = IRQ_ports[irq];
        if (!info)
                return;
 
#ifdef CONFIG_SERIAL_MULTIPORT  
        multi = &rs_multiport[irq];
        if (multi->port_monitor)
                first_multi = inb(multi->port_monitor);
#endif
 
        do {
                if (!info->tty ||
                    ((iir=serial_in(info, UART_IIR)) & UART_IIR_NO_INT)) {
                        if (!end_mark)
                                end_mark = info;
                        goto next;
                }
#ifdef SERIAL_DEBUG_INTR
                printk("IIR = %x...", serial_in(info, UART_IIR));
#endif
                end_mark = 0;
 
                info->last_active = jiffies;
 
                status = serial_inp(info, UART_LSR);
#ifdef SERIAL_DEBUG_INTR
                printk("status = %x...", status);
#endif
                if (status & UART_LSR_DR)
                        receive_chars(info, &status, regs);
                check_modem_status(info);
#ifdef CONFIG_MELAN
                if ((status & UART_LSR_THRE) ||
                        /* for buggy ELAN processors */
                        ((iir & UART_IIR_ID) == UART_IIR_THRI))
                        transmit_chars(info, 0);
#else
                if (status & UART_LSR_THRE)
                        transmit_chars(info, 0);
#endif
 
        next:
                info = info->next_port;
                if (!info) {
                        info = IRQ_ports[irq];
                        if (pass_counter++ > RS_ISR_PASS_LIMIT) {
#if 0
                                printk("rs loop break\n");
#endif
                                break;  /* Prevent infinite loops */
                        }
                        continue;
                }
        } while (end_mark != info);
#ifdef CONFIG_SERIAL_MULTIPORT  
        if (multi->port_monitor)
                printk("rs port monitor (normal) irq %d: 0x%x, 0x%x\n",
                       info->state->irq, first_multi,
                       inb(multi->port_monitor));
#endif
#ifdef SERIAL_DEBUG_INTR
        printk("end.\n");
#endif
}
#endif /* #ifdef CONFIG_SERIAL_SHARE_IRQ */
 
 
/*
 * This is the serial driver's interrupt routine for a single port
 */
static void rs_interrupt_single(int irq, void *dev_id, struct pt_regs * regs)
{
        int status, iir;
        int pass_counter = 0;
        struct async_struct * info;
#ifdef CONFIG_SERIAL_MULTIPORT  
        int first_multi = 0;
        struct rs_multiport_struct *multi;
#endif
 
#ifdef SERIAL_DEBUG_INTR
        printk("rs_interrupt_single(%d)...", irq);
#endif
 
        info = IRQ_ports[irq];
        if (!info || !info->tty)
                return;
 
#ifdef CONFIG_SERIAL_MULTIPORT  
        multi = &rs_multiport[irq];
        if (multi->port_monitor)
                first_multi = inb(multi->port_monitor);
#endif
 
        iir = serial_in(info, UART_IIR);
        do {
                status = serial_inp(info, UART_LSR);
#ifdef SERIAL_DEBUG_INTR
                printk("status = %x...", status);
#endif
                if (status & UART_LSR_DR)
                        receive_chars(info, &status, regs);
                check_modem_status(info);
#ifdef CONFIG_MELAN
                if ((status & UART_LSR_THRE) ||
                    /* For buggy ELAN processors */
                    ((iir & UART_IIR_ID) == UART_IIR_THRI))
                        transmit_chars(info, 0);
#else
                if (status & UART_LSR_THRE)
                        transmit_chars(info, 0);
#endif
                if (pass_counter++ > RS_ISR_PASS_LIMIT) {
#if SERIAL_DEBUG_INTR
                        printk("rs_single loop break.\n");
#endif
                        break;
                }
                iir = serial_in(info, UART_IIR);
#ifdef SERIAL_DEBUG_INTR
                printk("IIR = %x...", iir);
#endif
        } while ((iir & UART_IIR_NO_INT) == 0);
        info->last_active = jiffies;
#ifdef CONFIG_SERIAL_MULTIPORT  
        if (multi->port_monitor)
                printk("rs port monitor (single) irq %d: 0x%x, 0x%x\n",
                       info->state->irq, first_multi,
                       inb(multi->port_monitor));
#endif
#ifdef SERIAL_DEBUG_INTR
        printk("end.\n");
#endif
}
 
#ifdef CONFIG_SERIAL_MULTIPORT  
/*
 * This is the serial driver's for multiport boards
 */
static void 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[irq];
        if (!info)
                return;
        multi = &rs_multiport[irq];
        if (!multi->port1) {
                /* Should never happen */
                printk("rs_interrupt_multi: NULL port1!\n");
                return;
        }
        if (multi->port_monitor)
                first_multi = inb(multi->port_monitor);
 
        while (1) {
                if (!info->tty ||
                    (serial_in(info, UART_IIR) & UART_IIR_NO_INT))
                        goto next;
 
                info->last_active = jiffies;
 
                status = serial_inp(info, UART_LSR);
#ifdef SERIAL_DEBUG_INTR
                printk("status = %x...", status);
#endif
                if (status & UART_LSR_DR)
                        receive_chars(info, &status, regs);
                check_modem_status(info);
                if (status & UART_LSR_THRE)
                        transmit_chars(info, 0);
 
        next:
                info = info->next_port;
                if (info)
                        continue;
 
                info = IRQ_ports[irq];
                /*
                 * The user was a bonehead, and misconfigured their
                 * multiport info.  Rather than lock up the kernel
                 * in an infinite loop, if we loop too many times,
                 * print a message and break out of the loop.
                 */
                if (pass_counter++ > RS_ISR_PASS_LIMIT) {
                        printk("Misconfigured multiport serial info "
                               "for irq %d.  Breaking out irq loop\n", irq);
                        break;
                }
                if (multi->port_monitor)
                        printk("rs port monitor irq %d: 0x%x, 0x%x\n",
                               info->state->irq, first_multi,
                               inb(multi->port_monitor));
                if ((inb(multi->port1) & multi->mask1) != multi->match1)
                        continue;
                if (!multi->port2)
                        break;
                if ((inb(multi->port2) & multi->mask2) != multi->match2)
                        continue;
                if (!multi->port3)
                        break;
                if ((inb(multi->port3) & multi->mask3) != multi->match3)
                        continue;
                if (!multi->port4)
                        break;
                if ((inb(multi->port4) & multi->mask4) != multi->match4)
                        continue;
                break;
        }
#ifdef SERIAL_DEBUG_INTR
        printk("end.\n");
#endif
}
#endif
 
/*
 * -------------------------------------------------------------------
 * Here ends the serial interrupt routines.
 * -------------------------------------------------------------------
 */
 
/*
 * This routine is used to handle the "bottom half" processing for the
 * serial driver, known also the "software interrupt" processing.
 * This processing is done at the kernel interrupt level, after the
 * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON.  This
 * is where time-consuming activities which can not be done in the
 * interrupt driver proper are done; the interrupt driver schedules
 * them using rs_sched_event(), and they get done here.
 */
static void do_serial_bh(void)
{
        run_task_queue(&tq_serial);
}
 
static void do_softint(void *private_)
{
        struct async_struct     *info = (struct async_struct *) private_;
        struct tty_struct       *tty;
 
        tty = info->tty;
        if (!tty)
                return;
 
        if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
                if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
                    tty->ldisc.write_wakeup)
                        (tty->ldisc.write_wakeup)(tty);
                wake_up_interruptible(&tty->write_wait);
#ifdef SERIAL_HAVE_POLL_WAIT
                wake_up_interruptible(&tty->poll_wait);
#endif
        }
}
 
/*
 * This subroutine is called when the RS_TIMER goes off.  It is used
 * by the serial driver to handle ports that do not have an interrupt
 * (irq=0).  This doesn't work very well for 16450's, but gives barely
 * passable results for a 16550A.  (Although at the expense of much
 * CPU overhead).
 */
static void rs_timer(unsigned long dummy)
{
        static unsigned long last_strobe;
        struct async_struct *info;
        unsigned int    i;
        unsigned long flags;
 
        if ((jiffies - last_strobe) >= RS_STROBE_TIME) {
                for (i=0; i < NR_IRQS; i++) {
                        info = IRQ_ports[i];
                        if (!info)
                                continue;
                        save_flags(flags); cli();
#ifdef CONFIG_SERIAL_SHARE_IRQ
                        if (info->next_port) {
                                do {
                                        serial_out(info, UART_IER, 0);
                                        info->IER |= UART_IER_THRI;
                                        serial_out(info, UART_IER, info->IER);
                                        info = info->next_port;
                                } while (info);
#ifdef CONFIG_SERIAL_MULTIPORT
                                if (rs_multiport[i].port1)
                                        rs_interrupt_multi(i, NULL, NULL);
                                else
#endif
                                        rs_interrupt(i, NULL, NULL);
                        } else
#endif /* CONFIG_SERIAL_SHARE_IRQ */
                                rs_interrupt_single(i, NULL, NULL);
                        restore_flags(flags);
                }
        }
        last_strobe = jiffies;
        mod_timer(&serial_timer, jiffies + RS_STROBE_TIME);
 
        if (IRQ_ports[0]) {
                save_flags(flags); cli();
#ifdef CONFIG_SERIAL_SHARE_IRQ
                rs_interrupt(0, NULL, NULL);
#else
                rs_interrupt_single(0, NULL, NULL);
#endif
                restore_flags(flags);
 
                mod_timer(&serial_timer, jiffies + IRQ_timeout[0]);
        }
}
 
/*
 * ---------------------------------------------------------------
 * Low level utility subroutines for the serial driver:  routines to
 * figure out the appropriate timeout for an interrupt chain, routines
 * to initialize and startup a serial port, and routines to shutdown a
 * serial port.  Useful stuff like that.
 * ---------------------------------------------------------------
 */
 
/*
 * This routine figures out the correct timeout for a particular IRQ.
 * It uses the smallest timeout of all of the serial ports in a
 * particular interrupt chain.  Now only used for IRQ 0....
 */
static void figure_IRQ_timeout(int irq)
{
        struct  async_struct    *info;
        int     timeout = 60*HZ;        /* 60 seconds === a long time :-) */
 
        info = IRQ_ports[irq];
        if (!info) {
                IRQ_timeout[irq] = 60*HZ;
                return;
        }
        while (info) {
                if (info->timeout < timeout)
                        timeout = info->timeout;
                info = info->next_port;
        }
        if (!irq)
                timeout = timeout / 2;
        IRQ_timeout[irq] = (timeout > 3) ? timeout-2 : 1;
}
 
#ifdef CONFIG_SERIAL_RSA
/* Attempts to turn on the RSA FIFO.  Returns zero on failure */
static int enable_rsa(struct async_struct *info)
{
        unsigned char mode;
        int result;
        unsigned long flags;
 
        save_flags(flags); cli();
        mode = serial_inp(info, UART_RSA_MSR);
        result = mode & UART_RSA_MSR_FIFO;
 
        if (!result) {
                serial_outp(info, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO);
                mode = serial_inp(info, UART_RSA_MSR);
                result = mode & UART_RSA_MSR_FIFO;
        }
 
        restore_flags(flags);
        return result;
}
 
/* Attempts to turn off the RSA FIFO.  Returns zero on failure */
static int disable_rsa(struct async_struct *info)
{
        unsigned char mode;
        int result;
        unsigned long flags;
 
        save_flags(flags); cli();
        mode = serial_inp(info, UART_RSA_MSR);
        result = !(mode & UART_RSA_MSR_FIFO);
 
        if (!result) {
                serial_outp(info, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO);
                mode = serial_inp(info, UART_RSA_MSR);
                result = !(mode & UART_RSA_MSR_FIFO);
        }
 
        restore_flags(flags);
        return result;
}
#endif /* CONFIG_SERIAL_RSA */
 
static int startup(struct async_struct * info)
{
        unsigned long flags;
        int     retval=0;
        void (*handler)(int, void *, struct pt_regs *);
        struct serial_state *state= info->state;
        unsigned long page;
#ifdef CONFIG_SERIAL_MANY_PORTS
        unsigned short ICP;
#endif
 
        page = get_zeroed_page(GFP_KERNEL);
        if (!page)
                return -ENOMEM;
 
        save_flags(flags); cli();
 
        if (info->flags & ASYNC_INITIALIZED) {
                free_page(page);
                goto errout;
        }
 
        if (!CONFIGURED_SERIAL_PORT(state) || !state->type) {
                if (info->tty)
                        set_bit(TTY_IO_ERROR, &info->tty->flags);
                free_page(page);
                goto errout;
        }
        if (info->xmit.buf)
                free_page(page);
        else
                info->xmit.buf = (unsigned char *) page;
 
#ifdef SERIAL_DEBUG_OPEN
        printk("starting up ttys%d (irq %d)...", info->line, state->irq);
#endif
 
        if (uart_config[state->type].flags & UART_STARTECH) {
                /* Wake up UART */
                serial_outp(info, UART_LCR, 0xBF);
                serial_outp(info, UART_EFR, UART_EFR_ECB);
                /*
                 * Turn off LCR == 0xBF so we actually set the IER
                 * register on the XR16C850
                 */
                serial_outp(info, UART_LCR, 0);
                serial_outp(info, UART_IER, 0);
                /*
                 * Now reset LCR so we can turn off the ECB bit
                 */
                serial_outp(info, UART_LCR, 0xBF);
                serial_outp(info, UART_EFR, 0);
                /*
                 * For a XR16C850, we need to set the trigger levels
                 */
                if (state->type == PORT_16850) {
                        serial_outp(info, UART_FCTR, UART_FCTR_TRGD |
                                        UART_FCTR_RX);
                        serial_outp(info, UART_TRG, UART_TRG_96);
                        serial_outp(info, UART_FCTR, UART_FCTR_TRGD |
                                        UART_FCTR_TX);
                        serial_outp(info, UART_TRG, UART_TRG_96);
                }
                serial_outp(info, UART_LCR, 0);
        }
 
        if (state->type == PORT_16750) {
                /* Wake up UART */
                serial_outp(info, UART_IER, 0);
        }
 
        if (state->type == PORT_16C950) {
                /* Wake up and initialize UART */
                info->ACR = 0;
                serial_outp(info, UART_LCR, 0xBF);
                serial_outp(info, UART_EFR, UART_EFR_ECB);
                serial_outp(info, UART_IER, 0);
                serial_outp(info, UART_LCR, 0);
                serial_icr_write(info, UART_CSR, 0); /* Reset the UART */
                serial_outp(info, UART_LCR, 0xBF);
                serial_outp(info, UART_EFR, UART_EFR_ECB);
                serial_outp(info, UART_LCR, 0);
        }
 
#ifdef CONFIG_SERIAL_RSA
        /*
         * If this is an RSA port, see if we can kick it up to the
         * higher speed clock.
         */
        if (state->type == PORT_RSA) {
                if (state->baud_base != SERIAL_RSA_BAUD_BASE &&
                    enable_rsa(info))
                        state->baud_base = SERIAL_RSA_BAUD_BASE;
                if (state->baud_base == SERIAL_RSA_BAUD_BASE)
                        serial_outp(info, UART_RSA_FRR, 0);
        }
#endif
 
        /*
         * Clear the FIFO buffers and disable them
         * (they will be reenabled in change_speed())
         */
        if (uart_config[state->type].flags & UART_CLEAR_FIFO) {
                serial_outp(info, UART_FCR, UART_FCR_ENABLE_FIFO);
                serial_outp(info, UART_FCR, (UART_FCR_ENABLE_FIFO |
                                             UART_FCR_CLEAR_RCVR |
                                             UART_FCR_CLEAR_XMIT));
                serial_outp(info, UART_FCR, 0);
        }
 
        /*
         * 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);
 
        /*
         * 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 (!(info->flags & ASYNC_BUGGY_UART) &&
            (serial_inp(info, UART_LSR) == 0xff)) {
                printk("ttyS%d: LSR safety check engaged!\n", state->line);
                if (capable(CAP_SYS_ADMIN)) {
                        if (info->tty)
                                set_bit(TTY_IO_ERROR, &info->tty->flags);
                } else
                        retval = -ENODEV;
                goto errout;
        }
 
        /*
         * Allocate the IRQ if necessary
         */
        if (state->irq && (!IRQ_ports[state->irq] ||
                          !IRQ_ports[state->irq]->next_port)) {
                if (IRQ_ports[state->irq]) {
#ifdef CONFIG_SERIAL_SHARE_IRQ
                        free_irq(state->irq, &IRQ_ports[state->irq]);
#ifdef CONFIG_SERIAL_MULTIPORT                          
                        if (rs_multiport[state->irq].port1)
                                handler = rs_interrupt_multi;
                        else
#endif
                                handler = rs_interrupt;
#else
                        retval = -EBUSY;
                        goto errout;
#endif /* CONFIG_SERIAL_SHARE_IRQ */
                } else
                        handler = rs_interrupt_single;
 
                retval = request_irq(state->irq, handler, SA_SHIRQ,
                                     "serial", &IRQ_ports[state->irq]);
                if (retval) {
                        if (capable(CAP_SYS_ADMIN)) {
                                if (info->tty)
                                        set_bit(TTY_IO_ERROR,
                                                &info->tty->flags);
                                retval = 0;
                        }
                        goto errout;
                }
        }
 
        /*
         * Insert serial port into IRQ chain.
         */
        info->prev_port = 0;
        info->next_port = IRQ_ports[state->irq];
        if (info->next_port)
                info->next_port->prev_port = info;
        IRQ_ports[state->irq] = info;
        figure_IRQ_timeout(state->irq);
 
        /*
         * Now, initialize the UART
         */
        serial_outp(info, UART_LCR, UART_LCR_WLEN8);    /* reset DLAB */
 
        info->MCR = 0;
        if (info->tty->termios->c_cflag & CBAUD)
                info->MCR = UART_MCR_DTR | UART_MCR_RTS;
#ifdef CONFIG_SERIAL_MANY_PORTS
        if (info->flags & ASYNC_FOURPORT) {
                if (state->irq == 0)
                        info->MCR |= UART_MCR_OUT1;
        } else
#endif
        {
                if (state->irq != 0)
                        info->MCR |= UART_MCR_OUT2;
        }
        info->MCR |= ALPHA_KLUDGE_MCR;          /* Don't ask */
        serial_outp(info, UART_MCR, info->MCR);
 
        /*
         * Finally, enable interrupts
         */
        info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
        serial_outp(info, UART_IER, info->IER); /* enable interrupts */
 
#ifdef CONFIG_SERIAL_MANY_PORTS
        if (info->flags & ASYNC_FOURPORT) {
                /* Enable interrupts on the AST Fourport board */
                ICP = (info->port & 0xFE0) | 0x01F;
                outb_p(0x80, ICP);
                (void) inb_p(ICP);
        }
#endif
 
        /*
         * And clear the interrupt registers again for luck.
         */
        (void)serial_inp(info, UART_LSR);
        (void)serial_inp(info, UART_RX);
        (void)serial_inp(info, UART_IIR);
        (void)serial_inp(info, UART_MSR);
 
        if (info->tty)
                clear_bit(TTY_IO_ERROR, &info->tty->flags);
        info->xmit.head = info->xmit.tail = 0;
 
        /*
         * Set up serial timers...
         */
        mod_timer(&serial_timer, jiffies + 2*HZ/100);
 
        /*
         * Set up the tty->alt_speed kludge
         */
#if (LINUX_VERSION_CODE >= 131394) /* Linux 2.1.66 */
        if (info->tty) {
                if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
                        info->tty->alt_speed = 57600;
                if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
                        info->tty->alt_speed = 115200;
                if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
                        info->tty->alt_speed = 230400;
                if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
                        info->tty->alt_speed = 460800;
        }
#endif
 
        /*
         * and set the speed of the serial port
         */
        change_speed(info, 0);
 
        info->flags |= ASYNC_INITIALIZED;
        restore_flags(flags);
        return 0;
 
errout:
        restore_flags(flags);
        return retval;
}
 
/*
 * This routine will shutdown a serial port; interrupts are disabled, and
 * DTR is dropped if the hangup on close termio flag is on.
 */
static void shutdown(struct async_struct * info)
{
        unsigned long   flags;
        struct serial_state *state;
        int             retval;
 
        if (!(info->flags & ASYNC_INITIALIZED))
                return;
 
        state = info->state;
 
#ifdef SERIAL_DEBUG_OPEN
        printk("Shutting down serial port %d (irq %d)....", info->line,
               state->irq);
#endif
 
        save_flags(flags); cli(); /* Disable interrupts */
 
        /*
         * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
         * here so the queue might never be waken up
         */
        wake_up_interruptible(&info->delta_msr_wait);
 
        /*
         * First unlink the serial port from the IRQ chain...
         */
        if (info->next_port)
                info->next_port->prev_port = info->prev_port;
        if (info->prev_port)
                info->prev_port->next_port = info->next_port;
        else
                IRQ_ports[state->irq] = info->next_port;
        figure_IRQ_timeout(state->irq);
 
        /*
         * Free the IRQ, if necessary
         */
        if (state->irq && (!IRQ_ports[state->irq] ||
                          !IRQ_ports[state->irq]->next_port)) {
                if (IRQ_ports[state->irq]) {
                        free_irq(state->irq, &IRQ_ports[state->irq]);
                        retval = request_irq(state->irq, rs_interrupt_single,
                                             SA_SHIRQ, "serial",
                                             &IRQ_ports[state->irq]);
 
                        if (retval)
                                printk("serial shutdown: request_irq: error %d"
                                       "  Couldn't reacquire IRQ.\n", retval);
                } else
                        free_irq(state->irq, &IRQ_ports[state->irq]);
        }
 
        if (info->xmit.buf) {
                unsigned long pg = (unsigned long) info->xmit.buf;
                info->xmit.buf = 0;
                free_page(pg);
        }
 
        info->IER = 0;
        serial_outp(info, UART_IER, 0x00);      /* disable all intrs */
#ifdef CONFIG_SERIAL_MANY_PORTS
        if (info->flags & ASYNC_FOURPORT) {
                /* reset interrupts on the AST Fourport board */
                (void) inb((info->port & 0xFE0) | 0x01F);
                info->MCR |= UART_MCR_OUT1;
        } else
#endif
                info->MCR &= ~UART_MCR_OUT2;
        info->MCR |= ALPHA_KLUDGE_MCR;          /* Don't ask */
 
        /* disable break condition */
        serial_out(info, UART_LCR, serial_inp(info, UART_LCR) & ~UART_LCR_SBC);
 
        if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
                info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
        serial_outp(info, UART_MCR, info->MCR);
 
        /* disable FIFO's */
        serial_outp(info, UART_FCR, (UART_FCR_ENABLE_FIFO |
                                     UART_FCR_CLEAR_RCVR |
                                     UART_FCR_CLEAR_XMIT));
        serial_outp(info, UART_FCR, 0);
 
#ifdef CONFIG_SERIAL_RSA
        /*
         * Reset the RSA board back to 115kbps compat mode.
         */
        if ((state->type == PORT_RSA) &&
            (state->baud_base == SERIAL_RSA_BAUD_BASE &&
             disable_rsa(info)))
                state->baud_base = SERIAL_RSA_BAUD_BASE_LO;
#endif
 
 
        (void)serial_in(info, UART_RX);    /* read data port to reset things */
 
        if (info->tty)
                set_bit(TTY_IO_ERROR, &info->tty->flags);
 
        if (uart_config[info->state->type].flags & UART_STARTECH) {
                /* Arrange to enter sleep mode */
                serial_outp(info, UART_LCR, 0xBF);
                serial_outp(info, UART_EFR, UART_EFR_ECB);
                serial_outp(info, UART_LCR, 0);
                serial_outp(info, UART_IER, UART_IERX_SLEEP);
                serial_outp(info, UART_LCR, 0xBF);
                serial_outp(info, UART_EFR, 0);
                serial_outp(info, UART_LCR, 0);
        }
        if (info->state->type == PORT_16750) {
                /* Arrange to enter sleep mode */
                serial_outp(info, UART_IER, UART_IERX_SLEEP);
        }
        info->flags &= ~ASYNC_INITIALIZED;
        restore_flags(flags);
}
 
#if (LINUX_VERSION_CODE < 131394) /* Linux 2.1.66 */
static int baud_table[] = {
        0, 50, 75, 110, 134, 150, 200, 300,
        600, 1200, 1800, 2400, 4800, 9600, 19200,
        38400, 57600, 115200, 230400, 460800, 0 };
 
static int tty_get_baud_rate(struct tty_struct *tty)
{
        struct async_struct * info = (struct async_struct *)tty->driver_data;
        unsigned int cflag, i;
 
        cflag = tty->termios->c_cflag;
 
        i = cflag & CBAUD;
        if (i & CBAUDEX) {
                i &= ~CBAUDEX;
                if (i < 1 || i > 2)
                        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;
        }
        return baud_table[i];
}
#endif
 
/*
 * This routine is called to set the UART divisor registers to match
 * the specified baud rate for a serial port.
 */
static void change_speed(struct async_struct *info,
                         struct termios *old_termios)
{
        int     quot = 0, baud_base, baud;
        unsigned cflag, cval, fcr = 0;
        int     bits;
        unsigned long   flags;
 
        if (!info->tty || !info->tty->termios)
                return;
        cflag = info->tty->termios->c_cflag;
        if (!CONFIGURED_SERIAL_PORT(info))
                return;
 
        /* byte size and parity */
        switch (cflag & CSIZE) {
              case CS5: cval = 0x00; bits = 7; break;
              case CS6: cval = 0x01; bits = 8; break;
              case CS7: cval = 0x02; bits = 9; break;
              case CS8: cval = 0x03; bits = 10; break;
              /* Never happens, but GCC is too dumb to figure it out */
              default:  cval = 0x00; bits = 7; break;
              }
        if (cflag & CSTOPB) {
                cval |= 0x04;
                bits++;
        }
        if (cflag & PARENB) {
                cval |= UART_LCR_PARITY;
                bits++;
        }
        if (!(cflag & PARODD))
                cval |= UART_LCR_EPAR;
#ifdef CMSPAR
        if (cflag & CMSPAR)
                cval |= UART_LCR_SPAR;
#endif
 
        /* Determine divisor based on baud rate */
        baud = tty_get_baud_rate(info->tty);
        if (!baud)
                baud = 9600;    /* B0 transition handled in rs_set_termios */
#ifdef CONFIG_SERIAL_RSA
        if ((info->state->type == PORT_RSA) &&
            (info->state->baud_base != SERIAL_RSA_BAUD_BASE) &&
            enable_rsa(info))
                info->state->baud_base = SERIAL_RSA_BAUD_BASE;
#endif
        baud_base = info->state->baud_base;
        if (info->state->type == PORT_16C950) {
                if (baud <= baud_base)
                        serial_icr_write(info, UART_TCR, 0);
                else if (baud <= 2*baud_base) {
                        serial_icr_write(info, UART_TCR, 0x8);
                        baud_base = baud_base * 2;
                } else if (baud <= 4*baud_base) {
                        serial_icr_write(info, UART_TCR, 0x4);
                        baud_base = baud_base * 4;
                } else
                        serial_icr_write(info, UART_TCR, 0);
        }
        if (baud == 38400 &&
            ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
                quot = info->state->custom_divisor;
        else {
                if (baud == 134)
                        /* Special case since 134 is really 134.5 */
                        quot = (2*baud_base / 269);
                else if (baud)
                        quot = baud_base / baud;
        }
        /* If the quotient is zero refuse the change */
        if (!quot && old_termios) {
                info->tty->termios->c_cflag &= ~CBAUD;
                info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
                baud = tty_get_baud_rate(info->tty);
                if (!baud)
                        baud = 9600;
                if (baud == 38400 &&
                    ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
                        quot = info->state->custom_divisor;
                else {
                        if (baud == 134)
                                /* Special case since 134 is really 134.5 */
                                quot = (2*baud_base / 269);
                        else if (baud)
                                quot = baud_base / baud;
                }
        }
        /* As a last resort, if the quotient is zero, default to 9600 bps */
        if (!quot)
                quot = baud_base / 9600;
        /*
         * Work around a bug in the Oxford Semiconductor 952 rev B
         * chip which causes it to seriously miscalculate baud rates
         * when DLL is 0.
         */
        if (((quot & 0xFF) == 0) && (info->state->type == PORT_16C950) &&
            (info->state->revision == 0x5201))
                quot++;
 
        info->quot = quot;
        info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
        info->timeout += HZ/50;         /* Add .02 seconds of slop */
 
        /* Set up FIFO's */
        if (uart_config[info->state->type].flags & UART_USE_FIFO) {
                if ((info->state->baud_base / quot) < 2400)
                        fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
#ifdef CONFIG_SERIAL_RSA
                else if (info->state->type == PORT_RSA)
                        fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_14;
#endif
                else
                        fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8;
        }
        if (info->state->type == PORT_16750)
                fcr |= UART_FCR7_64BYTE;
 
        /* CTS flow control flag and modem status interrupts */
        info->IER &= ~UART_IER_MSI;
        if (info->flags & ASYNC_HARDPPS_CD)
                info->IER |= UART_IER_MSI;
        if (cflag & CRTSCTS) {
                info->flags |= ASYNC_CTS_FLOW;
                info->IER |= UART_IER_MSI;
        } else
                info->flags &= ~ASYNC_CTS_FLOW;
        if (cflag & CLOCAL)
                info->flags &= ~ASYNC_CHECK_CD;
        else {
                info->flags |= ASYNC_CHECK_CD;
                info->IER |= UART_IER_MSI;
        }
        serial_out(info, UART_IER, info->IER);
 
        /*
         * Set up parity check flag
         */
#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
 
        info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
        if (I_INPCK(info->tty))
                info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
        if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
                info->read_status_mask |= UART_LSR_BI;
 
        /*
         * Characters to ignore
         */
        info->ignore_status_mask = 0;
        if (I_IGNPAR(info->tty))
                info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
        if (I_IGNBRK(info->tty)) {
                info->ignore_status_mask |= UART_LSR_BI;
                /*
                 * If we're ignore parity and break indicators, ignore
                 * overruns too.  (For real raw support).
                 */
                if (I_IGNPAR(info->tty))
                        info->ignore_status_mask |= UART_LSR_OE;
        }
        /*
         * !!! ignore all characters if CREAD is not set
         */
        if ((cflag & CREAD) == 0)
                info->ignore_status_mask |= UART_LSR_DR;
        save_flags(flags); cli();
        if (uart_config[info->state->type].flags & UART_STARTECH) {
                serial_outp(info, UART_LCR, 0xBF);
                serial_outp(info, UART_EFR,
                            (cflag & CRTSCTS) ? UART_EFR_CTS : 0);
        }
        serial_outp(info, UART_LCR, cval | UART_LCR_DLAB);      /* set DLAB */
        serial_outp(info, UART_DLL, quot & 0xff);       /* LS of divisor */
        serial_outp(info, UART_DLM, quot >> 8);         /* MS of divisor */
        if (info->state->type == PORT_16750)
                serial_outp(info, UART_FCR, fcr);       /* set fcr */
        serial_outp(info, UART_LCR, cval);              /* reset DLAB */
        info->LCR = cval;                               /* Save LCR */
        if (info->state->type != PORT_16750) {
                if (fcr & UART_FCR_ENABLE_FIFO) {
                        /* emulated UARTs (Lucent Venus 167x) need two steps */
                        serial_outp(info, UART_FCR, UART_FCR_ENABLE_FIFO);
                }
                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 (CIRC_SPACE(info->xmit.head,
                       info->xmit.tail,
                       SERIAL_XMIT_SIZE) == 0) {
                restore_flags(flags);
                return;
        }
 
        info->xmit.buf[info->xmit.head] = ch;
        info->xmit.head = (info->xmit.head + 1) & (SERIAL_XMIT_SIZE-1);
        restore_flags(flags);
}
 
static void rs_flush_chars(struct tty_struct *tty)
{
        struct async_struct *info = (struct async_struct *)tty->driver_data;
        unsigned long flags;
 
        if (serial_paranoia_check(info, tty->device, "rs_flush_chars"))
                return;
 
        if (info->xmit.head == info->xmit.tail
            || tty->stopped
            || tty->hw_stopped
            || !info->xmit.buf)
                return;
 
        save_flags(flags); cli();
        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, ret = 0;
        struct async_struct *info = (struct async_struct *)tty->driver_data;
        unsigned long flags;
 
        if (serial_paranoia_check(info, tty->device, "rs_write"))
                return 0;
 
        if (!tty || !info->xmit.buf || !tmp_buf)
                return 0;
 
        save_flags(flags);
        if (from_user) {
                down(&tmp_buf_sem);
                while (1) {
                        int c1;
                        c = CIRC_SPACE_TO_END(info->xmit.head,
                                              info->xmit.tail,
                                              SERIAL_XMIT_SIZE);
                        if (count < c)
                                c = count;
                        if (c <= 0)
                                break;
 
                        c -= copy_from_user(tmp_buf, buf, c);
                        if (!c) {
                                if (!ret)
                                        ret = -EFAULT;
                                break;
                        }
                        cli();
                        c1 = CIRC_SPACE_TO_END(info->xmit.head,
                                               info->xmit.tail,
                                               SERIAL_XMIT_SIZE);
                        if (c1 < c)
                                c = c1;
                        memcpy(info->xmit.buf + info->xmit.head, tmp_buf, c);
                        info->xmit.head = ((info->xmit.head + c) &
                                           (SERIAL_XMIT_SIZE-1));
                        restore_flags(flags);
                        buf += c;
                        count -= c;
                        ret += c;
                }
                up(&tmp_buf_sem);
        } else {
                cli();
                while (1) {
                        c = CIRC_SPACE_TO_END(info->xmit.head,
                                              info->xmit.tail,
                                              SERIAL_XMIT_SIZE);
                        if (count < c)
                                c = count;
                        if (c <= 0) {
                                break;
                        }
                        memcpy(info->xmit.buf + info->xmit.head, buf, c);
                        info->xmit.head = ((info->xmit.head + c) &
                                           (SERIAL_XMIT_SIZE-1));
                        buf += c;
                        count -= c;
                        ret += c;
                }
                restore_flags(flags);
        }
        if (info->xmit.head != info->xmit.tail
            && !tty->stopped
            && !tty->hw_stopped
            && !(info->IER & UART_IER_THRI)) {
                info->IER |= UART_IER_THRI;
                serial_out(info, UART_IER, info->IER);
        }
        return ret;
}
 
static int rs_write_room(struct tty_struct *tty)
{
        struct async_struct *info = (struct async_struct *)tty->driver_data;
 
        if (serial_paranoia_check(info, tty->device, "rs_write_room"))
                return 0;
        return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
}
 
static int rs_chars_in_buffer(struct tty_struct *tty)
{
        struct async_struct *info = (struct async_struct *)tty->driver_data;
 
        if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer"))
                return 0;
        return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
}
 
static void rs_flush_buffer(struct tty_struct *tty)
{
        struct async_struct *info = (struct async_struct *)tty->driver_data;
        unsigned long flags;
 
        if (serial_paranoia_check(info, tty->device, "rs_flush_buffer"))
                return;
        save_flags(flags); cli();
        info->xmit.head = info->xmit.tail = 0;
        restore_flags(flags);
        wake_up_interruptible(&tty->write_wait);
#ifdef SERIAL_HAVE_POLL_WAIT
        wake_up_interruptible(&tty->poll_wait);
#endif
        if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
            tty->ldisc.write_wakeup)
                (tty->ldisc.write_wakeup)(tty);
}
 
/*
 * This function is used to send a high-priority XON/XOFF character to
 * the device
 */
static void rs_send_xchar(struct tty_struct *tty, char ch)
{
        struct async_struct *info = (struct async_struct *)tty->driver_data;
 
        if (serial_paranoia_check(info, tty->device, "rs_send_char"))
                return;
 
        info->x_char = ch;
        if (ch) {
                /* Make sure transmit interrupts are on */
                info->IER |= UART_IER_THRI;
                serial_out(info, UART_IER, info->IER);
        }
}
 
/*
 * ------------------------------------------------------------
 * rs_throttle()
 *
 * This routine is called by the upper-layer tty layer to signal that
 * incoming characters should be throttled.
 * ------------------------------------------------------------
 */
static void rs_throttle(struct tty_struct * tty)
{
        struct async_struct *info = (struct async_struct *)tty->driver_data;
        unsigned long flags;
#ifdef SERIAL_DEBUG_THROTTLE
        char    buf[64];
 
        printk("throttle %s: %d....\n", tty_name(tty, buf),
               tty->ldisc.chars_in_buffer(tty));
#endif
 
        if (serial_paranoia_check(info, tty->device, "rs_throttle"))
                return;
 
        if (I_IXOFF(tty))
                rs_send_xchar(tty, STOP_CHAR(tty));
 
        if (tty->termios->c_cflag & CRTSCTS)
                info->MCR &= ~UART_MCR_RTS;
 
        save_flags(flags); cli();
        serial_out(info, UART_MCR, info->MCR);
        restore_flags(flags);
}
 
static void rs_unthrottle(struct tty_struct * tty)
{
        struct async_struct *info = (struct async_struct *)tty->driver_data;
        unsigned long flags;
#ifdef SERIAL_DEBUG_THROTTLE
        char    buf[64];
 
        printk("unthrottle %s: %d....\n", tty_name(tty, buf),
               tty->ldisc.chars_in_buffer(tty));
#endif
 
        if (serial_paranoia_check(info, tty->device, "rs_unthrottle"))
                return;
 
        if (I_IXOFF(tty)) {
                if (info->x_char)
                        info->x_char = 0;
                else
                        rs_send_xchar(tty, START_CHAR(tty));
        }
        if (tty->termios->c_cflag & CRTSCTS)
                info->MCR |= UART_MCR_RTS;
        save_flags(flags); cli();
        serial_out(info, UART_MCR, info->MCR);
        restore_flags(flags);
}
 
/*
 * ------------------------------------------------------------
 * rs_ioctl() and friends
 * ------------------------------------------------------------
 */
 
static int get_serial_info(struct async_struct * info,
                           struct serial_struct * retinfo)
{
        struct serial_struct tmp;
        struct serial_state *state = info->state;
 
        if (!retinfo)
                return -EFAULT;
        memset(&tmp, 0, sizeof(tmp));
        tmp.type = state->type;
        tmp.line = state->line;
        tmp.port = state->port;
        if (HIGH_BITS_OFFSET)
                tmp.port_high = state->port >> HIGH_BITS_OFFSET;
        else
                tmp.port_high = 0;
        tmp.irq = state->irq;
        tmp.flags = state->flags;
        tmp.xmit_fifo_size = state->xmit_fifo_size;
        tmp.baud_base = state->baud_base;
        tmp.close_delay = state->close_delay;
        tmp.closing_wait = state->closing_wait;
        tmp.custom_divisor = state->custom_divisor;
        tmp.hub6 = state->hub6;
        tmp.io_type = state->io_type;
        if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
                return -EFAULT;
        return 0;
}
 
static int set_serial_info(struct async_struct * info,
                           struct serial_struct * new_info)
{
        struct serial_struct new_serial;
        struct serial_state old_state, *state;
        unsigned int            i,change_irq,change_port;
        int                     retval = 0;
        unsigned long           new_port;
 
        if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
                return -EFAULT;
        state = info->state;
        old_state = *state;
 
        new_port = new_serial.port;
        if (HIGH_BITS_OFFSET)
                new_port += (unsigned long) new_serial.port_high << HIGH_BITS_OFFSET;
 
        change_irq = new_serial.irq != state->irq;
        change_port = (new_port != ((int) state->port)) ||
                (new_serial.hub6 != state->hub6);
 
        if (!capable(CAP_SYS_ADMIN)) {
                if (change_irq || change_port ||
                    (new_serial.baud_base != state->baud_base) ||
                    (new_serial.type != state->type) ||
                    (new_serial.close_delay != state->close_delay) ||
                    (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
                    ((new_serial.flags & ~ASYNC_USR_MASK) !=
                     (state->flags & ~ASYNC_USR_MASK)))
                        return -EPERM;
                state->flags = ((state->flags & ~ASYNC_USR_MASK) |
                               (new_serial.flags & ASYNC_USR_MASK));
                info->flags = ((info->flags & ~ASYNC_USR_MASK) |
                               (new_serial.flags & ASYNC_USR_MASK));
                state->custom_divisor = new_serial.custom_divisor;
                goto check_and_exit;
        }
 
        new_serial.irq = irq_cannonicalize(new_serial.irq);
 
        if ((new_serial.irq >= NR_IRQS) || (new_serial.irq < 0) ||
            (new_serial.baud_base < 9600)|| (new_serial.type < PORT_UNKNOWN) ||
            (new_serial.type > PORT_MAX) || (new_serial.type == PORT_CIRRUS) ||
            (new_serial.type == PORT_STARTECH)) {
                return -EINVAL;
        }
 
        if ((new_serial.type != state->type) ||
            (new_serial.xmit_fifo_size <= 0))
                new_serial.xmit_fifo_size =
                        uart_config[new_serial.type].dfl_xmit_fifo_size;
 
        /* Make sure address is not already in use */
        if (new_serial.type) {
                for (i = 0 ; i < NR_PORTS; i++)
                        if ((state != &rs_table[i]) &&
                            (rs_table[i].io_type == SERIAL_IO_PORT) &&
                            (rs_table[i].port == new_port) &&
                            rs_table[i].type)
                                return -EADDRINUSE;
        }
 
        if ((change_port || change_irq) && (state->count > 1))
                return -EBUSY;
 
        /*
         * OK, past this point, all the error checking has been done.
         * At this point, we start making changes.....
         */
 
        state->baud_base = new_serial.baud_base;
        state->flags = ((state->flags & ~ASYNC_FLAGS) |
                        (new_serial.flags & ASYNC_FLAGS));
        info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
                       (info->flags & ASYNC_INTERNAL_FLAGS));
        state->custom_divisor = new_serial.custom_divisor;
        state->close_delay = new_serial.close_delay * HZ/100;
        state->closing_wait = new_serial.closing_wait * HZ/100;
#if (LINUX_VERSION_CODE > 0x20100)
        info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
#endif
        info->xmit_fifo_size = state->xmit_fifo_size =
                new_serial.xmit_fifo_size;
 
        if ((state->type != PORT_UNKNOWN) && state->port) {
#ifdef CONFIG_SERIAL_RSA
                if (old_state.type == PORT_RSA)
                        release_region(state->port + UART_RSA_BASE, 16);
                else
#endif
                release_region(state->port,8);
        }
        state->type = new_serial.type;
        if (change_port || change_irq) {
                /*
                 * We need to shutdown the serial port at the old
                 * port/irq combination.
                 */
                shutdown(info);
                state->irq = new_serial.irq;
                info->port = state->port = new_port;
                info->hub6 = state->hub6 = new_serial.hub6;
                if (info->hub6)
                        info->io_type = state->io_type = SERIAL_IO_HUB6;
                else if (info->io_type == SERIAL_IO_HUB6)
                        info->io_type = state->io_type = SERIAL_IO_PORT;
        }
        if ((state->type != PORT_UNKNOWN) && state->port) {
#ifdef CONFIG_SERIAL_RSA
                if (state->type == PORT_RSA)
                        request_region(state->port + UART_RSA_BASE,
                                       16, "serial_rsa(set)");
                else
#endif
                        request_region(state->port,8,"serial(set)");
        }
 
 
check_and_exit:
        if ((!state->port && !state->iomem_base) || !state->type)
                return 0;
        if (info->flags & ASYNC_INITIALIZED) {
                if (((old_state.flags & ASYNC_SPD_MASK) !=
                     (state->flags & ASYNC_SPD_MASK)) ||
                    (old_state.custom_divisor != state->custom_divisor)) {
#if (LINUX_VERSION_CODE >= 131394) /* Linux 2.1.66 */
                        if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
                                info->tty->alt_speed = 57600;
                        if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
                                info->tty->alt_speed = 115200;
                        if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
                                info->tty->alt_speed = 230400;
                        if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
                                info->tty->alt_speed = 460800;
#endif
                        change_speed(info, 0);
                }
        } else
                retval = startup(info);
        return retval;
}
 
 
/*
 * get_lsr_info - get line status register info
 *
 * Purpose: Let user call ioctl() to get info when the UART physically
 *          is emptied.  On bus types like RS485, the transmitter must
 *          release the bus after transmitting. This must be done when
 *          the transmit shift register is empty, not be done when the
 *          transmit holding register is empty.  This functionality
 *          allows an RS485 driver to be written in user space.
 */
static int get_lsr_info(struct async_struct * info, unsigned int *value)
{
        unsigned char status;
        unsigned int result;
        unsigned long flags;
 
        save_flags(flags); cli();
        status = serial_in(info, UART_LSR);
        restore_flags(flags);
        result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
 
        /*
         * If we're about to load something into the transmit
         * register, we'll pretend the transmitter isn't empty to
         * avoid a race condition (depending on when the transmit
         * interrupt happens).
         */
        if (info->x_char ||
            ((CIRC_CNT(info->xmit.head, info->xmit.tail,
                       SERIAL_XMIT_SIZE) > 0) &&
             !info->tty->stopped && !info->tty->hw_stopped))
                result &= ~TIOCSER_TEMT;
 
        if (copy_to_user(value, &result, sizeof(int)))
                return -EFAULT;
        return 0;
}
 
 
static int get_modem_info(struct async_struct * info, unsigned int *value)
{
        unsigned char control, status;
        unsigned int result;
        unsigned long flags;
 
        control = info->MCR;
        save_flags(flags); cli();
        status = serial_in(info, UART_MSR);
        restore_flags(flags);
        result =  ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
                | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
#ifdef TIOCM_OUT1
                | ((control & UART_MCR_OUT1) ? TIOCM_OUT1 : 0)
                | ((control & UART_MCR_OUT2) ? TIOCM_OUT2 : 0)
#endif
                | ((status  & UART_MSR_DCD) ? TIOCM_CAR : 0)
                | ((status  & UART_MSR_RI) ? TIOCM_RNG : 0)
                | ((status  & UART_MSR_DSR) ? TIOCM_DSR : 0)
                | ((status  & UART_MSR_CTS) ? TIOCM_CTS : 0);
 
        if (copy_to_user(value, &result, sizeof(int)))
                return -EFAULT;
        return 0;
}
 
static int set_modem_info(struct async_struct * info, unsigned int cmd,
                          unsigned int *value)
{
        unsigned int arg;
        unsigned long flags;
 
        if (copy_from_user(&arg, value, sizeof(int)))
                return -EFAULT;
 
        switch (cmd) {
        case TIOCMBIS:
                if (arg & TIOCM_RTS)
                        info->MCR |= UART_MCR_RTS;
                if (arg & TIOCM_DTR)
                        info->MCR |= UART_MCR_DTR;
#ifdef TIOCM_OUT1
                if (arg & TIOCM_OUT1)
                        info->MCR |= UART_MCR_OUT1;
                if (arg & TIOCM_OUT2)
                        info->MCR |= UART_MCR_OUT2;
#endif
                if (arg & TIOCM_LOOP)
                        info->MCR |= UART_MCR_LOOP;
                break;
        case TIOCMBIC:
                if (arg & TIOCM_RTS)
                        info->MCR &= ~UART_MCR_RTS;
                if (arg & TIOCM_DTR)
                        info->MCR &= ~UART_MCR_DTR;
#ifdef TIOCM_OUT1
                if (arg & TIOCM_OUT1)
                        info->MCR &= ~UART_MCR_OUT1;
                if (arg & TIOCM_OUT2)
                        info->MCR &= ~UART_MCR_OUT2;
#endif
                if (arg & TIOCM_LOOP)
                        info->MCR &= ~UART_MCR_LOOP;
                break;
        case TIOCMSET:
                info->MCR = ((info->MCR & ~(UART_MCR_RTS |
#ifdef TIOCM_OUT1
                                            UART_MCR_OUT1 |
                                            UART_MCR_OUT2 |
#endif
                                            UART_MCR_LOOP |
                                            UART_MCR_DTR))
                             | ((arg & TIOCM_RTS) ? UART_MCR_RTS : 0)
#ifdef TIOCM_OUT1
                             | ((arg & TIOCM_OUT1) ? UART_MCR_OUT1 : 0)
                             | ((arg & TIOCM_OUT2) ? UART_MCR_OUT2 : 0)
#endif
                             | ((arg & TIOCM_LOOP) ? UART_MCR_LOOP : 0)
                             | ((arg & TIOCM_DTR) ? UART_MCR_DTR : 0));
                break;
        default:
                return -EINVAL;
        }
        save_flags(flags); cli();
        info->MCR |= ALPHA_KLUDGE_MCR;          /* Don't ask */
        serial_out(info, UART_MCR, info->MCR);
        restore_flags(flags);
        return 0;
}
 
static int do_autoconfig(struct async_struct * info)
{
        int irq, retval;
 
        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;
 
        if (info->state->count > 1)
                return -EBUSY;
 
        shutdown(info);
 
        autoconfig(info->state);
        if ((info->state->flags & ASYNC_AUTO_IRQ) &&
            (info->state->port != 0  || info->state->iomem_base != 0) &&
            (info->state->type != PORT_UNKNOWN)) {
                irq = detect_uart_irq(info->state);
                if (irq > 0)
                        info->state->irq = irq;
        }
 
        retval = startup(info);
        if (retval)
                return retval;
        return 0;
}
 
/*
 * rs_break() --- routine which turns the break handling on or off
 */
#if (LINUX_VERSION_CODE < 131394) /* Linux 2.1.66 */
static void send_break( struct async_struct * info, int duration)
{
        if (!CONFIGURED_SERIAL_PORT(info))
                return;
        current->state = TASK_INTERRUPTIBLE;
        current->timeout = jiffies + duration;
        cli();
        info->LCR |= UART_LCR_SBC;
        serial_out(info, UART_LCR, info->LCR);
        schedule();
        info->LCR &= ~UART_LCR_SBC;
        serial_out(info, UART_LCR, info->LCR);
        sti();
}
#else
static void rs_break(struct tty_struct *tty, int break_state)
{
        struct async_struct * info = (struct async_struct *)tty->driver_data;
        unsigned long flags;
 
        if (serial_paranoia_check(info, tty->device, "rs_break"))
                return;
 
        if (!CONFIGURED_SERIAL_PORT(info))
                return;
        save_flags(flags); cli();
        if (break_state == -1)
                info->LCR |= UART_LCR_SBC;
        else
                info->LCR &= ~UART_LCR_SBC;
        serial_out(info, UART_LCR, info->LCR);
        restore_flags(flags);
}
#endif
 
#ifdef CONFIG_SERIAL_MULTIPORT
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[info->state->irq];
 
        ret.port_monitor = multi->port_monitor;
 
        ret.port1 = multi->port1;
        ret.mask1 = multi->mask1;
        ret.match1 = multi->match1;
 
        ret.port2 = multi->port2;
        ret.mask2 = multi->mask2;
        ret.match2 = multi->match2;
 
        ret.port3 = multi->port3;
        ret.mask3 = multi->mask3;
        ret.match3 = multi->match3;
 
        ret.port4 = multi->port4;
        ret.mask4 = multi->mask4;
        ret.match4 = multi->match4;
 
        ret.irq = info->state->irq;
 
        if (copy_to_user(retinfo,&ret,sizeof(*retinfo)))
                return -EFAULT;
        return 0;
}
 
static int set_multiport_struct(struct async_struct * info,
                                struct serial_multiport_struct *in_multi)
{
        struct serial_multiport_struct new_multi;
        struct rs_multiport_struct *multi;
        struct serial_state *state;
        int     was_multi, now_multi;
        int     retval;
        void (*handler)(int, void *, struct pt_regs *);
 
        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;
        state = info->state;
 
        if (copy_from_user(&new_multi, in_multi,
                           sizeof(struct serial_multiport_struct)))
                return -EFAULT;
 
        if (new_multi.irq != state->irq || state->irq == 0 ||
            !IRQ_ports[state->irq])
                return -EINVAL;
 
        multi = &rs_multiport[state->irq];
        was_multi = (multi->port1 != 0);
 
        multi->port_monitor = new_multi.port_monitor;
 
        if (multi->port1)
                release_region(multi->port1,1);
        multi->port1 = new_multi.port1;
        multi->mask1 = new_multi.mask1;
        multi->match1 = new_multi.match1;
        if (multi->port1)
                request_region(multi->port1,1,"serial(multiport1)");
 
        if (multi->port2)
                release_region(multi->port2,1);
        multi->port2 = new_multi.port2;
        multi->mask2 = new_multi.mask2;
        multi->match2 = new_multi.match2;
        if (multi->port2)
                request_region(multi->port2,1,"serial(multiport2)");
 
        if (multi->port3)
                release_region(multi->port3,1);
        multi->port3 = new_multi.port3;
        multi->mask3 = new_multi.mask3;
        multi->match3 = new_multi.match3;
        if (multi->port3)
                request_region(multi->port3,1,"serial(multiport3)");
 
        if (multi->port4)
                release_region(multi->port4,1);
        multi->port4 = new_multi.port4;
        multi->mask4 = new_multi.mask4;
        multi->match4 = new_multi.match4;
        if (multi->port4)
                request_region(multi->port4,1,"serial(multiport4)");
 
        now_multi = (multi->port1 != 0);
 
        if (IRQ_ports[state->irq]->next_port &&
            (was_multi != now_multi)) {
                free_irq(state->irq, &IRQ_ports[state->irq]);
                if (now_multi)
                        handler = rs_interrupt_multi;
                else
                        handler = rs_interrupt;
 
                retval = request_irq(state->irq, handler, SA_SHIRQ,
                                     "serial", &IRQ_ports[state->irq]);
                if (retval) {
                        printk("Couldn't reallocate serial interrupt "
                               "driver!!\n");
                }
        }
        return 0;
}
#endif
 
static int rs_ioctl(struct tty_struct *tty, struct file * file,
                    unsigned int cmd, unsigned long arg)
{
        struct async_struct * info = (struct async_struct *)tty->driver_data;
        struct async_icount cprev, cnow;        /* kernel counter temps */
        struct serial_icounter_struct icount;
        unsigned long flags;
#if (LINUX_VERSION_CODE < 131394) /* Linux 2.1.66 */
        int retval, tmp;
#endif
 
        if (serial_paranoia_check(info, tty->device, "rs_ioctl"))
                return -ENODEV;
 
        if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
            (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
            (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
                if (tty->flags & (1 << TTY_IO_ERROR))
                    return -EIO;
        }
 
        switch (cmd) {
#if (LINUX_VERSION_CODE < 131394) /* Linux 2.1.66 */
                case TCSBRK:    /* SVID version: non-zero arg --> no break */
                        retval = tty_check_change(tty);
                        if (retval)
                                return retval;
                        tty_wait_until_sent(tty, 0);
                        if (signal_pending(current))
                                return -EINTR;
                        if (!arg) {
                                send_break(info, HZ/4); /* 1/4 second */
                                if (signal_pending(current))
                                        return -EINTR;
                        }
                        return 0;
                case TCSBRKP:   /* support for POSIX tcsendbreak() */
                        retval = tty_check_change(tty);
                        if (retval)
                                return retval;
                        tty_wait_until_sent(tty, 0);
                        if (signal_pending(current))
                                return -EINTR;
                        send_break(info, arg ? arg*(HZ/10) : HZ/4);
                        if (signal_pending(current))
                                return -EINTR;
                        return 0;
                case TIOCGSOFTCAR:
                        tmp = C_CLOCAL(tty) ? 1 : 0;
                        if (copy_to_user((void *)arg, &tmp, sizeof(int)))
                                return -EFAULT;
                        return 0;
                case TIOCSSOFTCAR:
                        if (copy_from_user(&tmp, (void *)arg, sizeof(int)))
                                return -EFAULT;
 
                        tty->termios->c_cflag =
                                ((tty->termios->c_cflag & ~CLOCAL) |
                                 (tmp ? CLOCAL : 0));
                        return 0;
#endif
                case TIOCMGET:
                        return get_modem_info(info, (unsigned int *) arg);
                case TIOCMBIS:
                case TIOCMBIC:
                case TIOCMSET:
                        return set_modem_info(info, cmd, (unsigned int *) arg);
                case TIOCGSERIAL:
                        return get_serial_info(info,
                                               (struct serial_struct *) arg);
                case TIOCSSERIAL:
                        return set_serial_info(info,
                                               (struct serial_struct *) arg);
                case TIOCSERCONFIG:
                        return do_autoconfig(info);
 
                case TIOCSERGETLSR: /* Get line status register */
                        return get_lsr_info(info, (unsigned int *) arg);
 
                case TIOCSERGSTRUCT:
                        if (copy_to_user((struct async_struct *) arg,
                                         info, sizeof(struct async_struct)))
                                return -EFAULT;
                        return 0;
 
#ifdef CONFIG_SERIAL_MULTIPORT
                case TIOCSERGETMULTI:
                        return get_multiport_struct(info,
                                       (struct serial_multiport_struct *) arg);
                case TIOCSERSETMULTI:
                        return set_multiport_struct(info,
                                       (struct serial_multiport_struct *) arg);
#endif
 
                /*
                 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
                 * - mask passed in arg for lines of interest
                 *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
                 * Caller should use TIOCGICOUNT to see which one it was
                 */
                case TIOCMIWAIT:
                        save_flags(flags); cli();
                        /* note the counters on entry */
                        cprev = info->state->icount;
                        restore_flags(flags);
                        /* Force modem status interrupts on */
                        info->IER |= UART_IER_MSI;
                        serial_out(info, UART_IER, info->IER);
                        while (1) {
                                interruptible_sleep_on(&info->delta_msr_wait);
                                /* see if a signal did it */
                                if (signal_pending(current))
                                        return -ERESTARTSYS;
                                save_flags(flags); cli();
                                cnow = info->state->icount; /* atomic copy */
                                restore_flags(flags);
                                if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
                                    cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
                                        return -EIO; /* no change => error */
                                if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
                                     ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
                                     ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
                                     ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
                                        return 0;
                                }
                                cprev = cnow;
                        }
                        /* NOTREACHED */
 
                /*
                 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
                 * Return: write counters to the user passed counter struct
                 * NB: both 1->0 and 0->1 transitions are counted except for
                 *     RI where only 0->1 is counted.
                 */
                case TIOCGICOUNT:
                        save_flags(flags); cli();
                        cnow = info->state->icount;
                        restore_flags(flags);
                        icount.cts = cnow.cts;
                        icount.dsr = cnow.dsr;
                        icount.rng = cnow.rng;
                        icount.dcd = cnow.dcd;
                        icount.rx = cnow.rx;
                        icount.tx = cnow.tx;
                        icount.frame = cnow.frame;
                        icount.overrun = cnow.overrun;
                        icount.parity = cnow.parity;
                        icount.brk = cnow.brk;
                        icount.buf_overrun = cnow.buf_overrun;
 
                        if (copy_to_user((void *)arg, &icount, sizeof(icount)))
                                return -EFAULT;
                        return 0;
                case TIOCSERGWILD:
                case TIOCSERSWILD:
                        /* "setserial -W" is called in Debian boot */
                        printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
                        return 0;
 
                default:
                        return -ENOIOCTLCMD;
                }
        return 0;
}
 
static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
{
        struct async_struct *info = (struct async_struct *)tty->driver_data;
        unsigned long flags;
        unsigned int cflag = tty->termios->c_cflag;
 
        if (   (cflag == old_termios->c_cflag)
            && (   RELEVANT_IFLAG(tty->termios->c_iflag)
                == RELEVANT_IFLAG(old_termios->c_iflag)))
          return;
 
        change_speed(info, old_termios);
 
        /* Handle transition to B0 status */
        if ((old_termios->c_cflag & CBAUD) &&
            !(cflag & CBAUD)) {
                info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
                save_flags(flags); cli();
                serial_out(info, UART_MCR, info->MCR);
                restore_flags(flags);
        }
 
        /* Handle transition away from B0 status */
        if (!(old_termios->c_cflag & CBAUD) &&
            (cflag & CBAUD)) {
                info->MCR |= UART_MCR_DTR;
                if (!(tty->termios->c_cflag & CRTSCTS) ||
                    !test_bit(TTY_THROTTLED, &tty->flags)) {
                        info->MCR |= UART_MCR_RTS;
                }
                save_flags(flags); cli();
                serial_out(info, UART_MCR, info->MCR);
                restore_flags(flags);
        }
 
        /* Handle turning off CRTSCTS */
        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;
        struct serial_state *state;
        unsigned long flags;
 
        if (!info || serial_paranoia_check(info, tty->device, "rs_close"))
                return;
 
        state = info->state;
 
        save_flags(flags); cli();
 
        if (tty_hung_up_p(filp)) {
                DBG_CNT("before DEC-hung");
                MOD_DEC_USE_COUNT;
                restore_flags(flags);
                return;
        }
 
#ifdef SERIAL_DEBUG_OPEN
        printk("rs_close ttys%d, count = %d\n", info->line, state->count);
#endif
        if ((tty->count == 1) && (state->count != 1)) {
                /*
                 * Uh, oh.  tty->count is 1, which means that the tty
                 * structure will be freed.  state->count should always
                 * be one in these conditions.  If it's greater than
                 * one, we've got real problems, since it means the
                 * serial port won't be shutdown.
                 */
                printk("rs_close: bad serial port count; tty->count is 1, "
                       "state->count is %d\n", state->count);
                state->count = 1;
        }
        if (--state->count < 0) {
                printk("rs_close: bad serial port count for ttys%d: %d\n",
                       info->line, state->count);
                state->count = 0;
        }
        if (state->count) {
                DBG_CNT("before DEC-2");
                MOD_DEC_USE_COUNT;
                restore_flags(flags);
                return;
        }
        info->flags |= ASYNC_CLOSING;
        restore_flags(flags);
        /*
         * Save the termios structure, since this port may have
         * separate termios for callout and dialin.
         */
        if (info->flags & ASYNC_NORMAL_ACTIVE)
                info->state->normal_termios = *tty->termios;
        if (info->flags & ASYNC_CALLOUT_ACTIVE)
                info->state->callout_termios = *tty->termios;
        /*
         * Now we wait for the transmit buffer to clear; and we notify
         * the line discipline to only process XON/XOFF characters.
         */
        tty->closing = 1;
        if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
                tty_wait_until_sent(tty, info->closing_wait);
        /*
         * At this point we stop accepting input.  To do this, we
         * disable the receive line status interrupts, and tell the
         * interrupt driver to stop checking the data ready bit in the
         * line status register.
         */
        info->IER &= ~UART_IER_RLSI;
        info->read_status_mask &= ~UART_LSR_DR;
        if (info->flags & ASYNC_INITIALIZED) {
                serial_out(info, UART_IER, info->IER);
                /*
                 * Before we drop DTR, make sure the UART transmitter
                 * has completely drained; this is especially
                 * important if there is a transmit FIFO!
                 */
                rs_wait_until_sent(tty, info->timeout);
        }
        shutdown(info);
        if (tty->driver.flush_buffer)
                tty->driver.flush_buffer(tty);
        if (tty->ldisc.flush_buffer)
                tty->ldisc.flush_buffer(tty);
        tty->closing = 0;
        info->event = 0;
        info->tty = 0;
        if (info->blocked_open) {
                if (info->close_delay) {
                        set_current_state(TASK_INTERRUPTIBLE);
                        schedule_timeout(info->close_delay);
                }
                wake_up_interruptible(&info->open_wait);
        }
        info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
                         ASYNC_CLOSING);
        wake_up_interruptible(&info->close_wait);
        MOD_DEC_USE_COUNT;
}
 
/*
 * rs_wait_until_sent() --- wait until the transmitter is empty
 */
static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
{
        struct async_struct * info = (struct async_struct *)tty->driver_data;
        unsigned long orig_jiffies, char_time;
        int lsr;
 
        if (serial_paranoia_check(info, tty->device, "rs_wait_until_sent"))
                return;
 
        if (info->state->type == PORT_UNKNOWN)
                return;
 
        if (info->xmit_fifo_size == 0)
                return; /* Just in case.... */
 
        orig_jiffies = jiffies;
        /*
         * Set the check interval to be 1/5 of the estimated time to
         * send a single character, and make it at least 1.  The check
         * interval should also be less than the timeout.
         *
         * Note: we have to use pretty tight timings here to satisfy
         * the NIST-PCTS.
         */
        char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
        char_time = char_time / 5;
        if (char_time == 0)
                char_time = 1;
        if (timeout && timeout < char_time)
                char_time = timeout;
        /*
         * If the transmitter hasn't cleared in twice the approximate
         * amount of time to send the entire FIFO, it probably won't
         * ever clear.  This assumes the UART isn't doing flow
         * control, which is currently the case.  Hence, if it ever
         * takes longer than info->timeout, this is probably due to a
         * UART bug of some kind.  So, we clamp the timeout parameter at
         * 2*info->timeout.
         */
        if (!timeout || timeout > 2*info->timeout)
                timeout = 2*info->timeout;
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
        printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
        printk("jiff=%lu...", jiffies);
#endif
        while (!((lsr = serial_inp(info, UART_LSR)) & UART_LSR_TEMT)) {
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
                printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
#endif
                set_current_state(TASK_INTERRUPTIBLE);
                schedule_timeout(char_time);
                if (signal_pending(current))
                        break;
                if (timeout && time_after(jiffies, orig_jiffies + timeout))
                        break;
        }
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
        printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
#endif
}
 
/*
 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
 */
static void rs_hangup(struct tty_struct *tty)
{
        struct async_struct * info = (struct async_struct *)tty->driver_data;
        struct serial_state *state = info->state;
 
        if (serial_paranoia_check(info, tty->device, "rs_hangup"))
                return;
 
        state = info->state;
 
        rs_flush_buffer(tty);
        if (info->flags & ASYNC_CLOSING)
                return;
        shutdown(info);
        info->event = 0;
        state->count = 0;
        info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
        info->tty = 0;
        wake_up_interruptible(&info->open_wait);
}
 
/*
 * ------------------------------------------------------------
 * rs_open() and friends
 * ------------------------------------------------------------
 */
static int block_til_ready(struct tty_struct *tty, struct file * filp,
                           struct async_struct *info)
{
        DECLARE_WAITQUEUE(wait, current);
        struct serial_state *state = info->state;
        int             retval;
        int             do_clocal = 0, extra_count = 0;
        unsigned long   flags;
 
        /*
         * If the device is in the middle of being closed, then block
         * until it's done, and then try again.
         */
        if (tty_hung_up_p(filp) ||
            (info->flags & ASYNC_CLOSING)) {
                if (info->flags & ASYNC_CLOSING)
                        interruptible_sleep_on(&info->close_wait);
#ifdef SERIAL_DO_RESTART
                return ((info->flags & ASYNC_HUP_NOTIFY) ?
                        -EAGAIN : -ERESTARTSYS);
#else
                return -EAGAIN;
#endif
        }
 
        /*
         * If this is a callout device, then just make sure the normal
         * device isn't being used.
         */
        if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
                if (info->flags & ASYNC_NORMAL_ACTIVE)
                        return -EBUSY;
                if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
                    (info->flags & ASYNC_SESSION_LOCKOUT) &&
                    (info->session != current->session))
                    return -EBUSY;
                if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
                    (info->flags & ASYNC_PGRP_LOCKOUT) &&
                    (info->pgrp != current->pgrp))
                    return -EBUSY;
                info->flags |= ASYNC_CALLOUT_ACTIVE;
                return 0;
        }
 
        /*
         * If non-blocking mode is set, or the port is not enabled,
         * then make the check up front and then exit.
         */
        if ((filp->f_flags & O_NONBLOCK) ||
            (tty->flags & (1 << TTY_IO_ERROR))) {
                if (info->flags & ASYNC_CALLOUT_ACTIVE)
                        return -EBUSY;
                info->flags |= ASYNC_NORMAL_ACTIVE;
                return 0;
        }
 
        if (info->flags & ASYNC_CALLOUT_ACTIVE) {
                if (state->normal_termios.c_cflag & CLOCAL)
                        do_clocal = 1;
        } else {
                if (tty->termios->c_cflag & CLOCAL)
                        do_clocal = 1;
        }
 
        /*
         * Block waiting for the carrier detect and the line to become
         * free (i.e., not in use by the callout).  While we are in
         * this loop, state->count is dropped by one, so that
         * rs_close() knows when to free things.  We restore it upon
         * exit, either normal or abnormal.
         */
        retval = 0;
        add_wait_queue(&info->open_wait, &wait);
#ifdef SERIAL_DEBUG_OPEN
        printk("block_til_ready before block: ttys%d, count = %d\n",
               state->line, state->count);
#endif
        save_flags(flags); cli();
        if (!tty_hung_up_p(filp)) {
                extra_count = 1;
                state->count--;
        }
        restore_flags(flags);
        info->blocked_open++;
        while (1) {
                save_flags(flags); cli();
                if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
                    (tty->termios->c_cflag & CBAUD))
                        serial_out(info, UART_MCR,
                                   serial_inp(info, UART_MCR) |
                                   (UART_MCR_DTR | UART_MCR_RTS));
                restore_flags(flags);
                set_current_state(TASK_INTERRUPTIBLE);
                if (tty_hung_up_p(filp) ||
                    !(info->flags & ASYNC_INITIALIZED)) {
#ifdef SERIAL_DO_RESTART
                        if (info->flags & ASYNC_HUP_NOTIFY)
                                retval = -EAGAIN;
                        else
                                retval = -ERESTARTSYS;
#else
                        retval = -EAGAIN;
#endif
                        break;
                }
                if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
                    !(info->flags & ASYNC_CLOSING) &&
                    (do_clocal || (serial_in(info, UART_MSR) &
                                   UART_MSR_DCD)))
                        break;
                if (signal_pending(current)) {
                        retval = -ERESTARTSYS;
                        break;
                }
#ifdef SERIAL_DEBUG_OPEN
                printk("block_til_ready blocking: ttys%d, count = %d\n",
                       info->line, state->count);
#endif
                schedule();
        }
        set_current_state(TASK_RUNNING);
        remove_wait_queue(&info->open_wait, &wait);
        if (extra_count)
                state->count++;
        info->blocked_open--;
#ifdef SERIAL_DEBUG_OPEN
        printk("block_til_ready after blocking: ttys%d, count = %d\n",
               info->line, state->count);
#endif
        if (retval)
                return retval;
        info->flags |= ASYNC_NORMAL_ACTIVE;
        return 0;
}
 
static int get_async_struct(int line, struct async_struct **ret_info)
{
        struct async_struct *info;
        struct serial_state *sstate;
 
        sstate = rs_table + line;
        sstate->count++;
        if (sstate->info) {
                *ret_info = sstate->info;
                return 0;
        }
        info = kmalloc(sizeof(struct async_struct), GFP_KERNEL);
        if (!info) {
                sstate->count--;
                return -ENOMEM;
        }
        memset(info, 0, sizeof(struct async_struct));
        init_waitqueue_head(&info->open_wait);
        init_waitqueue_head(&info->close_wait);
        init_waitqueue_head(&info->delta_msr_wait);
        info->magic = SERIAL_MAGIC;
        info->port = sstate->port;
        info->flags = sstate->flags;
        info->io_type = sstate->io_type;
        info->iomem_base = sstate->iomem_base;
        info->iomem_reg_shift = sstate->iomem_reg_shift;
        info->xmit_fifo_size = sstate->xmit_fifo_size;
        info->line = line;
        info->tqueue.routine = do_softint;
        info->tqueue.data = info;
        info->state = sstate;
        if (sstate->info) {
                kfree(info);
                *ret_info = sstate->info;
                return 0;
        }
        *ret_info = sstate->info = info;
        return 0;
}
 
/*
 * This routine is called whenever a serial port is opened.  It
 * enables interrupts for a serial port, linking in its async structure into
 * the IRQ chain.   It also performs the serial-specific
 * initialization for the tty structure.
 *
 * Note that on failure, we don't decrement the module use count - the tty
 * later will call rs_close, which will decrement it for us as long as
 * tty->driver_data is set non-NULL. --rmk
 */
static int rs_open(struct tty_struct *tty, struct file * filp)
{
        struct async_struct     *info;
        int                     retval, line;
        unsigned long           page;
 
        MOD_INC_USE_COUNT;
        line = MINOR(tty->device) - tty->driver.minor_start;
        if ((line < 0) || (line >= NR_PORTS)) {
                MOD_DEC_USE_COUNT;
                return -ENODEV;
        }
        retval = get_async_struct(line, &info);
        if (retval) {
                MOD_DEC_USE_COUNT;
                return retval;
        }
        tty->driver_data = info;
        info->tty = tty;
        if (serial_paranoia_check(info, tty->device, "rs_open"))
                return -ENODEV;
 
#ifdef SERIAL_DEBUG_OPEN
        printk("rs_open %s%d, count = %d\n", tty->driver.name, info->line,
               info->state->count);
#endif
#if (LINUX_VERSION_CODE > 0x20100)
        info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
#endif
 
        /*
         *      This relies on lock_kernel() stuff so wants tidying for 2.5
         */
        if (!tmp_buf) {
                page = get_zeroed_page(GFP_KERNEL);
                if (!page)
                        return -ENOMEM;
                if (tmp_buf)
                        free_page(page);
                else
                        tmp_buf = (unsigned char *) page;
        }
 
        /*
         * If the port is the middle of closing, bail out now
         */
        if (tty_hung_up_p(filp) ||
            (info->flags & ASYNC_CLOSING)) {
                if (info->flags & ASYNC_CLOSING)
                        interruptible_sleep_on(&info->close_wait);
#ifdef SERIAL_DO_RESTART
                return ((info->flags & ASYNC_HUP_NOTIFY) ?
                        -EAGAIN : -ERESTARTSYS);
#else
                return -EAGAIN;
#endif
        }
 
        /*
         * Start up serial port
         */
        retval = startup(info);
        if (retval)
                return retval;
 
        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->state->count == 1) &&
            (info->flags & ASYNC_SPLIT_TERMIOS)) {
                if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
                        *tty->termios = info->state->normal_termios;
                else
                        *tty->termios = info->state->callout_termios;
                change_speed(info, 0);
        }
#ifdef CONFIG_SERIAL_CONSOLE
        if (sercons.cflag && sercons.index == line) {
                tty->termios->c_cflag = sercons.cflag;
                sercons.cflag = 0;
                change_speed(info, 0);
        }
#endif
        info->session = current->session;
        info->pgrp = current->pgrp;
 
#ifdef SERIAL_DEBUG_OPEN
        printk("rs_open ttys%d successful...", info->line);
#endif
        return 0;
}
 
/*
 * /proc fs routines....
 */
 
static inline int line_info(char *buf, struct serial_state *state)
{
        struct async_struct *info = state->info, scr_info;
        char    stat_buf[30], control, status;
        int     ret;
        unsigned long flags;
 
        /*
         * Return zero characters for ports not claimed by driver.
         */
        if (state->type == PORT_UNKNOWN) {
                return 0;        /* ignore unused ports */
        }
 
        ret = sprintf(buf, "%d: uart:%s port:%lX irq:%d",
                      state->line, uart_config[state->type].name,
                      (state->port ? state->port : (long)state->iomem_base),
                      state->irq);
 
        /*
         * Figure out the current RS-232 lines
         */
        if (!info) {
                info = &scr_info;       /* This is just for serial_{in,out} */
 
                info->magic = SERIAL_MAGIC;
                info->port = state->port;
                info->flags = state->flags;
                info->hub6 = state->hub6;
                info->io_type = state->io_type;
                info->iomem_base = state->iomem_base;
                info->iomem_reg_shift = state->iomem_reg_shift;
                info->quot = 0;
                info->tty = 0;
        }
        save_flags(flags); cli();
        status = serial_in(info, UART_MSR);
        control = info != &scr_info ? info->MCR : serial_in(info, UART_MCR);
        restore_flags(flags);
 
        stat_buf[0] = 0;
        stat_buf[1] = 0;
        if (control & UART_MCR_RTS)
                strcat(stat_buf, "|RTS");
        if (status & UART_MSR_CTS)
                strcat(stat_buf, "|CTS");
        if (control & UART_MCR_DTR)
                strcat(stat_buf, "|DTR");
        if (status & UART_MSR_DSR)
                strcat(stat_buf, "|DSR");
        if (status & UART_MSR_DCD)
                strcat(stat_buf, "|CD");
        if (status & UART_MSR_RI)
                strcat(stat_buf, "|RI");
 
        if (info->quot) {
                ret += sprintf(buf+ret, " baud:%d",
                               state->baud_base / info->quot);
        }
 
        ret += sprintf(buf+ret, " tx:%d rx:%d",
                      state->icount.tx, state->icount.rx);
 
        if (state->icount.frame)
                ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
 
        if (state->icount.parity)
                ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
 
        if (state->icount.brk)
                ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
 
        if (state->icount.overrun)
                ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
 
        /*
         * Last thing is the RS-232 status lines
         */
        ret += sprintf(buf+ret, " %s\n", stat_buf+1);
        return ret;
}
 
static int rs_read_proc(char *page, char **start, off_t off, int count,
                        int *eof, void *data)
{
        int i, len = 0, l;
        off_t   begin = 0;
 
        len += sprintf(page, "serinfo:1.0 driver:%s%s revision:%s\n",
                       serial_version, LOCAL_VERSTRING, serial_revdate);
        for (i = 0; i < NR_PORTS && len < 4000; i++) {
                l = line_info(page + len, &rs_table[i]);
                len += l;
                if (len+begin > off+count)
                        goto done;
                if (len+begin < off) {
                        begin += len;
                        len = 0;
                }
        }
        *eof = 1;
done:
        if (off >= len+begin)
                return 0;
        *start = page + (off-begin);
        return ((count < begin+len-off) ? count : begin+len-off);
}
 
/*
 * ---------------------------------------------------------------------
 * 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 char serial_options[] __initdata =
#ifdef CONFIG_HUB6
       " HUB-6"
#define SERIAL_OPT
#endif
#ifdef CONFIG_SERIAL_MANY_PORTS
       " MANY_PORTS"
#define SERIAL_OPT
#endif
#ifdef CONFIG_SERIAL_MULTIPORT
       " MULTIPORT"
#define SERIAL_OPT
#endif
#ifdef CONFIG_SERIAL_SHARE_IRQ
       " SHARE_IRQ"
#define SERIAL_OPT
#endif
#ifdef CONFIG_SERIAL_DETECT_IRQ
       " DETECT_IRQ"
#define SERIAL_OPT
#endif
#ifdef ENABLE_SERIAL_PCI
       " SERIAL_PCI"
#define SERIAL_OPT
#endif
#ifdef ENABLE_SERIAL_PNP
       " ISAPNP"
#define SERIAL_OPT
#endif
#ifdef ENABLE_SERIAL_ACPI
       " SERIAL_ACPI"
#define SERIAL_OPT
#endif
#ifdef SERIAL_OPT
       " enabled\n";
#else
       " no serial options enabled\n";
#endif
#undef SERIAL_OPT
 
static _INLINE_ void show_serial_version(void)
{
        printk(KERN_INFO "%s version %s%s (%s) with%s", serial_name,
               serial_version, LOCAL_VERSTRING, serial_revdate,
               serial_options);
}
 
/*
 * This routine detect the IRQ of a serial port by clearing OUT2 when
 * no UART interrupt are requested (IER = 0) (*GPL*). This seems to work at
 * each time, as long as no other device permanently request the IRQ.
 * If no IRQ is detected, or multiple IRQ appear, this function returns 0.
 * The variable "state" and the field "state->port" should not be null.
 */
static unsigned detect_uart_irq (struct serial_state * state)
{
        int irq;
        unsigned long irqs;
        unsigned char save_mcr, save_ier;
        struct async_struct scr_info; /* serial_{in,out} because HUB6 */
 
#ifdef CONFIG_SERIAL_MANY_PORTS
        unsigned char save_ICP=0; /* no warning */
        unsigned short ICP=0;
 
        if (state->flags & ASYNC_FOURPORT)  {
                ICP = (state->port & 0xFE0) | 0x01F;
                save_ICP = inb_p(ICP);
                outb_p(0x80, ICP);
                (void) inb_p(ICP);
        }
#endif
        scr_info.magic = SERIAL_MAGIC;
        scr_info.state = state;
        scr_info.port = state->port;
        scr_info.flags = state->flags;
#ifdef CONFIG_HUB6
        scr_info.hub6 = state->hub6;
#endif
        scr_info.io_type = state->io_type;
        scr_info.iomem_base = state->iomem_base;
        scr_info.iomem_reg_shift = state->iomem_reg_shift;
 
        /* forget possible initially masked and pending IRQ */
        probe_irq_off(probe_irq_on());
        save_mcr = serial_inp(&scr_info, UART_MCR);
        save_ier = serial_inp(&scr_info, UART_IER);
        serial_outp(&scr_info, UART_MCR, UART_MCR_OUT1 | UART_MCR_OUT2);
 
        irqs = probe_irq_on();
        serial_outp(&scr_info, UART_MCR, 0);
        udelay (10);
        if (state->flags & ASYNC_FOURPORT)  {
                serial_outp(&scr_info, UART_MCR,
                            UART_MCR_DTR | UART_MCR_RTS);
        } else {
                serial_outp(&scr_info, UART_MCR,
                            UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2);
        }
        serial_outp(&scr_info, UART_IER, 0x0f); /* enable all intrs */
        (void)serial_inp(&scr_info, UART_LSR);
        (void)serial_inp(&scr_info, UART_RX);
        (void)serial_inp(&scr_info, UART_IIR);
        (void)serial_inp(&scr_info, UART_MSR);
        serial_outp(&scr_info, UART_TX, 0xFF);
        udelay (20);
        irq = probe_irq_off(irqs);
 
        serial_outp(&scr_info, UART_MCR, save_mcr);
        serial_outp(&scr_info, UART_IER, save_ier);
#ifdef CONFIG_SERIAL_MANY_PORTS
        if (state->flags & ASYNC_FOURPORT)
                outb_p(save_ICP, ICP);
#endif
        return (irq > 0)? irq : 0;
}
 
/*
 * This is a quickie test to see how big the FIFO is.
 * It doesn't work at all the time, more's the pity.
 */
static int size_fifo(struct async_struct *info)
{
        unsigned char old_fcr, old_mcr, old_dll, old_dlm;
        int count;
 
        old_fcr = serial_inp(info, UART_FCR);
        old_mcr = serial_inp(info, UART_MCR);
        serial_outp(info, UART_FCR, UART_FCR_ENABLE_FIFO |
                    UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
        serial_outp(info, UART_MCR, UART_MCR_LOOP);
        serial_outp(info, UART_LCR, UART_LCR_DLAB);
        old_dll = serial_inp(info, UART_DLL);
        old_dlm = serial_inp(info, UART_DLM);
        serial_outp(info, UART_DLL, 0x01);
        serial_outp(info, UART_DLM, 0x00);
        serial_outp(info, UART_LCR, 0x03);
        for (count = 0; count < 256; count++)
                serial_outp(info, UART_TX, count);
        mdelay(20);
        for (count = 0; (serial_inp(info, UART_LSR) & UART_LSR_DR) &&
             (count < 256); count++)
                serial_inp(info, UART_RX);
        serial_outp(info, UART_FCR, old_fcr);
        serial_outp(info, UART_MCR, old_mcr);
        serial_outp(info, UART_LCR, UART_LCR_DLAB);
        serial_outp(info, UART_DLL, old_dll);
        serial_outp(info, UART_DLM, old_dlm);
 
        return count;
}
 
/*
 * This is a helper routine to autodetect StarTech/Exar/Oxsemi UART's.
 * When this function is called we know it is at least a StarTech
 * 16650 V2, but it might be one of several StarTech UARTs, or one of
 * its clones.  (We treat the broken original StarTech 16650 V1 as a
 * 16550, and why not?  Startech doesn't seem to even acknowledge its
 * existence.)
 *
 * What evil have men's minds wrought...
 */
static void autoconfig_startech_uarts(struct async_struct *info,
                                      struct serial_state *state,
                                      unsigned long flags)
{
        unsigned char scratch, scratch2, scratch3, scratch4;
 
        /*
         * First we check to see if it's an Oxford Semiconductor UART.
         *
         * If we have to do this here because some non-National
         * Semiconductor clone chips lock up if you try writing to the
         * LSR register (which serial_icr_read does)
         */
        if (state->type == PORT_16550A) {
                /*
                 * EFR [4] must be set else this test fails
                 *
                 * This shouldn't be necessary, but Mike Hudson
                 * (Exoray@isys.ca) claims that it's needed for 952
                 * dual UART's (which are not recommended for new designs).
                 */
                info->ACR = 0;
                serial_out(info, UART_LCR, 0xBF);
                serial_out(info, UART_EFR, 0x10);
                serial_out(info, UART_LCR, 0x00);
                /* Check for Oxford Semiconductor 16C950 */
                scratch = serial_icr_read(info, UART_ID1);
                scratch2 = serial_icr_read(info, UART_ID2);
                scratch3 = serial_icr_read(info, UART_ID3);
 
                if (scratch == 0x16 && scratch2 == 0xC9 &&
                    (scratch3 == 0x50 || scratch3 == 0x52 ||
                     scratch3 == 0x54)) {
                        state->type = PORT_16C950;
                        state->revision = serial_icr_read(info, UART_REV) |
                                (scratch3 << 8);
                        return;
                }
        }
 
        /*
         * We check for a XR16C850 by setting DLL and DLM to 0, and
         * then reading back DLL and DLM.  If DLM reads back 0x10,
         * then the UART is a XR16C850 and the DLL contains the chip
         * revision.  If DLM reads back 0x14, then the UART is a
         * XR16C854.
         *
         */
 
        /* Save the DLL and DLM */
 
        serial_outp(info, UART_LCR, UART_LCR_DLAB);
        scratch3 = serial_inp(info, UART_DLL);
        scratch4 = serial_inp(info, UART_DLM);
 
        serial_outp(info, UART_DLL, 0);
        serial_outp(info, UART_DLM, 0);
        scratch2 = serial_inp(info, UART_DLL);
        scratch = serial_inp(info, UART_DLM);
        serial_outp(info, UART_LCR, 0);
 
        if (scratch == 0x10 || scratch == 0x14) {
                if (scratch == 0x10)
                        state->revision = scratch2;
                state->type = PORT_16850;
                return;
        }
 
        /* Restore the DLL and DLM */
 
        serial_outp(info, UART_LCR, UART_LCR_DLAB);
        serial_outp(info, UART_DLL, scratch3);
        serial_outp(info, UART_DLM, scratch4);
        serial_outp(info, UART_LCR, 0);
        /*
         * We distinguish between the '654 and the '650 by counting
         * how many bytes are in the FIFO.  I'm using this for now,
         * since that's the technique that was sent to me in the
         * serial driver update, but I'm not convinced this works.
         * I've had problems doing this in the past.  -TYT
         */
        if (size_fifo(info) == 64)
                state->type = PORT_16654;
        else
                state->type = PORT_16650V2;
}
 
/*
 * This routine is called by rs_init() to initialize a specific serial
 * port.  It determines what type of UART chip this serial port is
 * using: 8250, 16450, 16550, 16550A.  The important question is
 * whether or not this UART is a 16550A or not, since this will
 * determine whether or not we can use its FIFO features or not.
 */
static void autoconfig(struct serial_state * state)
{
        unsigned char status1, status2, scratch, scratch2, scratch3;
        unsigned char save_lcr, save_mcr;
        struct async_struct *info, scr_info;
        unsigned long flags;
 
        state->type = PORT_UNKNOWN;
 
#ifdef SERIAL_DEBUG_AUTOCONF
        printk("Testing ttyS%d (0x%04lx, 0x%04x)...\n", state->line,
               state->port, (unsigned) state->iomem_base);
#endif
 
        if (!CONFIGURED_SERIAL_PORT(state))
                return;
 
        info = &scr_info;       /* This is just for serial_{in,out} */
 
        info->magic = SERIAL_MAGIC;
        info->state = state;
        info->port = state->port;
        info->flags = state->flags;
#ifdef CONFIG_HUB6
        info->hub6 = state->hub6;
#endif
        info->io_type = state->io_type;
        info->iomem_base = state->iomem_base;
        info->iomem_reg_shift = state->iomem_reg_shift;
 
        save_flags(flags); cli();
 
        if (!(state->flags & ASYNC_BUGGY_UART) &&
            !state->iomem_base) {
                /*
                 * 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);
#ifdef __i386__
                outb(0xff, 0x080);
#endif
                scratch2 = serial_inp(info, UART_IER);
                serial_outp(info, UART_IER, 0x0F);
#ifdef __i386__
                outb(0, 0x080);
#endif
                scratch3 = serial_inp(info, UART_IER);
                serial_outp(info, UART_IER, scratch);
                if (scratch2 || scratch3 != 0x0F) {
#ifdef SERIAL_DEBUG_AUTOCONF
                        printk("serial: ttyS%d: simple autoconfig failed "
                               "(%02x, %02x)\n", state->line,
                               scratch2, scratch3);
#endif
                        restore_flags(flags);
                        return;         /* We failed; there's nothing here */
                }
        }
 
        save_mcr = serial_in(info, UART_MCR);
        save_lcr = serial_in(info, UART_LCR);
 
        /*
         * 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 (!(state->flags & ASYNC_SKIP_TEST)) {
                serial_outp(info, UART_MCR, UART_MCR_LOOP | 0x0A);
                status1 = serial_inp(info, UART_MSR) & 0xF0;
                serial_outp(info, UART_MCR, save_mcr);
                if (status1 != 0x90) {
#ifdef SERIAL_DEBUG_AUTOCONF
                        printk("serial: ttyS%d: no UART loopback failed\n",
                               state->line);
#endif
                        restore_flags(flags);
                        return;
                }
        }
        serial_outp(info, UART_LCR, 0xBF); /* set up for StarTech test */
        serial_outp(info, UART_EFR, 0);  /* EFR is the same as FCR */
        serial_outp(info, UART_LCR, 0);
        serial_outp(info, UART_FCR, UART_FCR_ENABLE_FIFO);
        scratch = serial_in(info, UART_IIR) >> 6;
        switch (scratch) {
                case 0:
                        state->type = PORT_16450;
                        break;
                case 1:
                        state->type = PORT_UNKNOWN;
                        break;
                case 2:
                        state->type = PORT_16550;
                        break;
                case 3:
                        state->type = PORT_16550A;
                        break;
        }
        if (state->type == PORT_16550A) {
                /* Check for Startech UART's */
                serial_outp(info, UART_LCR, UART_LCR_DLAB);
                if (serial_in(info, UART_EFR) == 0) {
                        serial_outp(info, UART_EFR, 0xA8);
                        if (serial_in(info, UART_EFR) == 0) {
                                /* We are a NS16552D/Motorola
                                 * 8xxx DUART, stop. */
                                goto out;
                        }
                        state->type = PORT_16650;
                        serial_outp(info, UART_EFR, 0);
                } else {
                        serial_outp(info, UART_LCR, 0xBF);
                        if (serial_in(info, UART_EFR) == 0)
                                autoconfig_startech_uarts(info, state, flags);
                }
        }
        if (state->type == PORT_16550A) {
                /* Check for TI 16750 */
                serial_outp(info, UART_LCR, save_lcr | UART_LCR_DLAB);
                serial_outp(info, UART_FCR,
                            UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
                scratch = serial_in(info, UART_IIR) >> 5;
                if (scratch == 7) {
                        /*
                         * If this is a 16750, and not a cheap UART
                         * clone, then it should only go into 64 byte
                         * mode if the UART_FCR7_64BYTE bit was set
                         * while UART_LCR_DLAB was latched.
                         */
                        serial_outp(info, UART_FCR, UART_FCR_ENABLE_FIFO);
                        serial_outp(info, UART_LCR, 0);
                        serial_outp(info, UART_FCR,
                                    UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
                        scratch = serial_in(info, UART_IIR) >> 5;
                        if (scratch == 6)
                                state->type = PORT_16750;
                }
                serial_outp(info, UART_FCR, UART_FCR_ENABLE_FIFO);
        }
#if defined(CONFIG_SERIAL_RSA) && defined(MODULE)
        if (state->type == PORT_16550A) {
                int i;
 
                for (i = 0 ; i < PORT_RSA_MAX ; ++i) {
                        if (!probe_rsa[i] && !force_rsa[i])
                                break;
                        if (((probe_rsa[i] != state->port) ||
                             check_region(state->port + UART_RSA_BASE, 16)) &&
                            (force_rsa[i] != state->port))
                                continue;
                        if (!enable_rsa(info))
                                continue;
                        state->type = PORT_RSA;
                        state->baud_base = SERIAL_RSA_BAUD_BASE;
                        break;
                }
        }
#endif
out:
        serial_outp(info, UART_LCR, save_lcr);
        if (state->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))
                        state->type = PORT_8250;
        }
        state->xmit_fifo_size = uart_config[state->type].dfl_xmit_fifo_size;
 
        if (state->type == PORT_UNKNOWN) {
                restore_flags(flags);
                return;
        }
 
        if (info->port) {
#ifdef CONFIG_SERIAL_RSA
                if (state->type == PORT_RSA)
                        request_region(info->port + UART_RSA_BASE, 16,
                                       "serial_rsa(auto)");
                else
#endif
                        request_region(info->port,8,"serial(auto)");
        }
 
        /*
         * Reset the UART.
         */
#ifdef CONFIG_SERIAL_RSA
        if (state->type == PORT_RSA)
                serial_outp(info, UART_RSA_FRR, 0);
#endif
        serial_outp(info, UART_MCR, save_mcr);
        serial_outp(info, UART_FCR, (UART_FCR_ENABLE_FIFO |
                                     UART_FCR_CLEAR_RCVR |
                                     UART_FCR_CLEAR_XMIT));
        serial_outp(info, UART_FCR, 0);
        (void)serial_in(info, UART_RX);
        serial_outp(info, UART_IER, 0);
 
        restore_flags(flags);
}
 
int register_serial(struct serial_struct *req);
void unregister_serial(int line);
 
#if (LINUX_VERSION_CODE > 0x20100)
EXPORT_SYMBOL(register_serial);
EXPORT_SYMBOL(unregister_serial);
#else
static struct symbol_table serial_syms = {
#include <linux/symtab_begin.h>
        X(register_serial),
        X(unregister_serial),
#include <linux/symtab_end.h>
};
#endif
 
 
#if defined(ENABLE_SERIAL_PCI) || defined(ENABLE_SERIAL_PNP) 
 
static void __devinit printk_pnp_dev_id(unsigned short vendor,
                                     unsigned short device)
{
        printk("%c%c%c%x%x%x%x",
               'A' + ((vendor >> 2) & 0x3f) - 1,
               'A' + (((vendor & 3) << 3) | ((vendor >> 13) & 7)) - 1,
               'A' + ((vendor >> 8) & 0x1f) - 1,
               (device >> 4) & 0x0f,
               device & 0x0f,
               (device >> 12) & 0x0f,
               (device >> 8) & 0x0f);
}
 
static _INLINE_ int get_pci_port(struct pci_dev *dev,
                                  struct pci_board *board,
                                  struct serial_struct *req,
                                  int idx)
{
        unsigned long port;
        int base_idx;
        int max_port;
        int offset;
 
        base_idx = SPCI_FL_GET_BASE(board->flags);
        if (board->flags & SPCI_FL_BASE_TABLE)
                base_idx += idx;
 
        if (board->flags & SPCI_FL_REGION_SZ_CAP) {
                max_port = pci_resource_len(dev, base_idx) / 8;
                if (idx >= max_port)
                        return 1;
        }
 
        offset = board->first_uart_offset;
 
        /* Timedia/SUNIX uses a mixture of BARs and offsets */
        /* Ugh, this is ugly as all hell --- TYT */
        if(dev->vendor == PCI_VENDOR_ID_TIMEDIA )  /* 0x1409 */
                switch(idx) {
                        case 0: base_idx=0;
                                break;
                        case 1: base_idx=0; offset=8;
                                break;
                        case 2: base_idx=1;
                                break;
                        case 3: base_idx=1; offset=8;
                                break;
                        case 4: /* BAR 2*/
                        case 5: /* BAR 3 */
                        case 6: /* BAR 4*/
                        case 7: base_idx=idx-2; /* BAR 5*/
                }
 
        /* Some Titan cards are also a little weird */
        if (dev->vendor == PCI_VENDOR_ID_TITAN &&
            (dev->device == PCI_DEVICE_ID_TITAN_400L ||
             dev->device == PCI_DEVICE_ID_TITAN_800L)) {
                switch (idx) {
                case 0: base_idx = 1;
                        break;
                case 1: base_idx = 2;
                        break;
                default:
                        base_idx = 4;
                        offset = 8 * (idx - 2);
                }
 
        }
 
        /* HP's Diva chip puts the 4th/5th serial port further out, and
         * some serial ports are supposed to be hidden on certain models.
         */
        if (dev->vendor == PCI_VENDOR_ID_HP &&
                        dev->device == PCI_DEVICE_ID_HP_SAS) {
                switch (dev->subsystem_device) {
                case 0x104B: /* Maestro */
                        if (idx == 3) idx++;
                        break;
                case 0x1282: /* Everest / Longs Peak */
                        if (idx > 0) idx++;
                        if (idx > 2) idx++;
                        break;
                }
                if (idx > 2) {
                        offset = 0x18;
                }
        }
 
        port =  pci_resource_start(dev, base_idx) + offset;
 
        if ((board->flags & SPCI_FL_BASE_TABLE) == 0)
                port += idx * (board->uart_offset ? board->uart_offset : 8);
 
        if (IS_PCI_REGION_IOPORT(dev, base_idx)) {
                req->port = port;
                if (HIGH_BITS_OFFSET)
                        req->port_high = port >> HIGH_BITS_OFFSET;
                else
                        req->port_high = 0;
                return 0;
        }
        req->io_type = SERIAL_IO_MEM;
        req->iomem_base = ioremap(port, board->uart_offset);
        req->iomem_reg_shift = board->reg_shift;
        req->port = 0;
        return 0;
}
 
static _INLINE_ int get_pci_irq(struct pci_dev *dev,
                                struct pci_board *board,
                                int idx)
{
        int base_idx;
 
        if ((board->flags & SPCI_FL_IRQRESOURCE) == 0)
                return dev->irq;
 
        base_idx = SPCI_FL_GET_IRQBASE(board->flags);
        if (board->flags & SPCI_FL_IRQ_TABLE)
                base_idx += idx;
 
        return PCI_IRQ_RESOURCE(dev, base_idx);
}
 
/*
 * Common enabler code shared by both PCI and ISAPNP probes
 */
static void __devinit start_pci_pnp_board(struct pci_dev *dev,
                                       struct pci_board *board)
{
        int k, line;
        struct serial_struct serial_req;
        int base_baud;
 
       if (PREPARE_FUNC(dev) && (PREPARE_FUNC(dev))(dev) < 0) {
               printk("serial: PNP device '");
               printk_pnp_dev_id(dev->vendor, dev->device);
               printk("' prepare failed\n");
               return;
       }
 
       if (ACTIVATE_FUNC(dev) && (ACTIVATE_FUNC(dev))(dev) < 0) {
               printk("serial: PNP device '");
               printk_pnp_dev_id(dev->vendor, dev->device);
               printk("' activate failed\n");
               return;
       }
 
        /*
         * Run the initialization function, if any
         */
        if (board->init_fn && ((board->init_fn)(dev, board, 1) != 0))
                return;
 
        /*
         * Register the serial board in the array if we need to
         * shutdown the board on a module unload or card removal
         */
        if (DEACTIVATE_FUNC(dev) || board->init_fn) {
                for (k=0; k < NR_PCI_BOARDS; k++)
                        if (serial_pci_board[k].dev == 0)
                                break;
                if (k >= NR_PCI_BOARDS)
                        return;
                serial_pci_board[k].board = *board;
                serial_pci_board[k].dev = dev;
        }
 
        base_baud = board->base_baud;
        if (!base_baud)
                base_baud = BASE_BAUD;
        memset(&serial_req, 0, sizeof(serial_req));
 
        for (k=0; k < board->num_ports; k++) {
                serial_req.irq = get_pci_irq(dev, board, k);
                if (get_pci_port(dev, board, &serial_req, k))
                        break;
                serial_req.flags = ASYNC_SKIP_TEST | ASYNC_AUTOPROBE;
#ifdef SERIAL_DEBUG_PCI
                printk("Setup PCI/PNP port: port %x, irq %d, type %d\n",
                       serial_req.port, serial_req.irq, serial_req.io_type);
#endif
                line = register_serial(&serial_req);
                if (line < 0)
                        break;
                rs_table[line].baud_base = base_baud;
                rs_table[line].dev = dev;
        }
}
#endif  /* ENABLE_SERIAL_PCI || ENABLE_SERIAL_PNP */
 
#ifdef ENABLE_SERIAL_PCI
/*
 * Some PCI serial cards using the PLX 9050 PCI interface chip require
 * that the card interrupt be explicitly enabled or disabled.  This
 * seems to be mainly needed on card using the PLX which also use I/O
 * mapped memory.
 */
static int __devinit
pci_plx9050_fn(struct pci_dev *dev, struct pci_board *board, int enable)
{
        u8 data, *p, irq_config;
        int pci_config;
 
        irq_config = 0x41;
        pci_config = PCI_COMMAND_MEMORY;
        if (dev->vendor == PCI_VENDOR_ID_PANACOM)
                irq_config = 0x43;
        if ((dev->vendor == PCI_VENDOR_ID_PLX) &&
            (dev->device == PCI_DEVICE_ID_PLX_ROMULUS)) {
                /*
                 * As the megawolf cards have the int pins active
                 * high, and have 2 UART chips, both ints must be
                 * enabled on the 9050. Also, the UARTS are set in
                 * 16450 mode by default, so we have to enable the
                 * 16C950 'enhanced' mode so that we can use the deep
                 * FIFOs
                 */
                irq_config = 0x5b;
                pci_config = PCI_COMMAND_MEMORY | PCI_COMMAND_IO;
        }
 
        pci_read_config_byte(dev, PCI_COMMAND, &data);
 
        if (enable)
                pci_write_config_byte(dev, PCI_COMMAND,
                                      data | pci_config);
 
        /* enable/disable interrupts */
        p = ioremap(pci_resource_start(dev, 0), 0x80);
        writel(enable ? irq_config : 0x00, (unsigned long)p + 0x4c);
        iounmap(p);
 
        if (!enable)
                pci_write_config_byte(dev, PCI_COMMAND,
                                      data & ~pci_config);
        return 0;
}
 
 
/*
 * SIIG serial cards have an PCI interface chip which also controls
 * the UART clocking frequency. Each UART can be clocked independently
 * (except cards equiped with 4 UARTs) and initial clocking settings
 * are stored in the EEPROM chip. It can cause problems because this
 * version of serial driver doesn't support differently clocked UART's
 * on single PCI card. To prevent this, initialization functions set
 * high frequency clocking for all UART's on given card. It is safe (I
 * hope) because it doesn't touch EEPROM settings to prevent conflicts
 * with other OSes (like M$ DOS).
 *
 *  SIIG support added by Andrey Panin <pazke@mail.tp.ru>, 10/1999
 *
 * There is two family of SIIG serial cards with different PCI
 * interface chip and different configuration methods:
 *     - 10x cards have control registers in IO and/or memory space;
 *     - 20x cards have control registers in standard PCI configuration space.
 *
 * SIIG initialization functions exported for use by parport_serial.c module.
 */
 
#define PCI_DEVICE_ID_SIIG_1S_10x (PCI_DEVICE_ID_SIIG_1S_10x_550 & 0xfffc)
#define PCI_DEVICE_ID_SIIG_2S_10x (PCI_DEVICE_ID_SIIG_2S_10x_550 & 0xfff8)
 
int __devinit
pci_siig10x_fn(struct pci_dev *dev, struct pci_board *board, int enable)
{
       u16 data, *p;
 
       if (!enable) return 0;
 
       p = ioremap(pci_resource_start(dev, 0), 0x80);
 
       switch (dev->device & 0xfff8) {
               case PCI_DEVICE_ID_SIIG_1S_10x:         /* 1S */
                       data = 0xffdf;
                       break;
               case PCI_DEVICE_ID_SIIG_2S_10x:         /* 2S, 2S1P */
                       data = 0xf7ff;
                       break;
               default:                                /* 1S1P, 4S */
                       data = 0xfffb;
                       break;
       }
 
       writew(readw((unsigned long) p + 0x28) & data, (unsigned long) p + 0x28);
       iounmap(p);
       return 0;
}
EXPORT_SYMBOL(pci_siig10x_fn);
 
#define PCI_DEVICE_ID_SIIG_2S_20x (PCI_DEVICE_ID_SIIG_2S_20x_550 & 0xfffc)
#define PCI_DEVICE_ID_SIIG_2S1P_20x (PCI_DEVICE_ID_SIIG_2S1P_20x_550 & 0xfffc)
 
int __devinit
pci_siig20x_fn(struct pci_dev *dev, struct pci_board *board, int enable)
{
       u8 data;
 
       if (!enable) return 0;
 
       /* Change clock frequency for the first UART. */
       pci_read_config_byte(dev, 0x6f, &data);
       pci_write_config_byte(dev, 0x6f, data & 0xef);
 
       /* If this card has 2 UART, we have to do the same with second UART. */
       if (((dev->device & 0xfffc) == PCI_DEVICE_ID_SIIG_2S_20x) ||
           ((dev->device & 0xfffc) == PCI_DEVICE_ID_SIIG_2S1P_20x)) {
               pci_read_config_byte(dev, 0x73, &data);
               pci_write_config_byte(dev, 0x73, data & 0xef);
       }
       return 0;
}
EXPORT_SYMBOL(pci_siig20x_fn);
 
/* Added for EKF Intel i960 serial boards */
static int __devinit
pci_inteli960ni_fn(struct pci_dev *dev,
                   struct pci_board *board,
                   int enable)
{
        unsigned long oldval;
 
        if (!(pci_get_subdevice(dev) & 0x1000))
                return(-1);
 
        if (!enable) /* is there something to deinit? */
                return(0);
 
#ifdef SERIAL_DEBUG_PCI
        printk(KERN_DEBUG " Subsystem ID %lx (intel 960)\n",
               (unsigned long) board->subdevice);
#endif
        /* is firmware started? */
        pci_read_config_dword(dev, 0x44, (void*) &oldval);
        if (oldval == 0x00001000L) { /* RESET value */
                printk(KERN_DEBUG "Local i960 firmware missing");
                return(-1);
        }
        return(0);
}
 
/*
 * Timedia has an explosion of boards, and to avoid the PCI table from
 * growing *huge*, we use this function to collapse some 70 entries
 * in the PCI table into one, for sanity's and compactness's sake.
 */
static unsigned short timedia_single_port[] = {
        0x4025, 0x4027, 0x4028, 0x5025, 0x5027, 0 };
static unsigned short timedia_dual_port[] = {
        0x0002, 0x4036, 0x4037, 0x4038, 0x4078, 0x4079, 0x4085,
        0x4088, 0x4089, 0x5037, 0x5078, 0x5079, 0x5085, 0x6079,
        0x7079, 0x8079, 0x8137, 0x8138, 0x8237, 0x8238, 0x9079,
        0x9137, 0x9138, 0x9237, 0x9238, 0xA079, 0xB079, 0xC079,
        0xD079, 0 };
static unsigned short timedia_quad_port[] = {
        0x4055, 0x4056, 0x4095, 0x4096, 0x5056, 0x8156, 0x8157,
        0x8256, 0x8257, 0x9056, 0x9156, 0x9157, 0x9158, 0x9159,
        0x9256, 0x9257, 0xA056, 0xA157, 0xA158, 0xA159, 0xB056,
        0xB157, 0 };
static unsigned short timedia_eight_port[] = {
        0x4065, 0x4066, 0x5065, 0x5066, 0x8166, 0x9066, 0x9166,
        0x9167, 0x9168, 0xA066, 0xA167, 0xA168, 0 };
static struct timedia_struct {
        int num;
        unsigned short *ids;
} timedia_data[] = {
        { 1, timedia_single_port },
        { 2, timedia_dual_port },
        { 4, timedia_quad_port },
        { 8, timedia_eight_port },
        { 0, 0 }
};
 
static int __devinit
pci_timedia_fn(struct pci_dev *dev, struct pci_board *board, int enable)
{
        int     i, j;
        unsigned short *ids;
 
        if (!enable)
                return 0;
 
        for (i=0; timedia_data[i].num; i++) {
                ids = timedia_data[i].ids;
                for (j=0; ids[j]; j++) {
                        if (pci_get_subdevice(dev) == ids[j]) {
                                board->num_ports = timedia_data[i].num;
                                return 0;
                        }
                }
        }
        return 0;
}
 
/*
 * HP's Remote Management Console.  The Diva chip came in several
 * different versions.  N-class, L2000 and A500 have two Diva chips, each
 * with 3 UARTs (the third UART on the second chip is unused).  Superdome
 * and Keystone have one Diva chip with 3 UARTs.  Some later machines have
 * one Diva chip, but it has been expanded to 5 UARTs.
 */
static int __devinit
pci_hp_diva(struct pci_dev *dev, struct pci_board *board, int enable)
{
        if (!enable)
                return 0;
 
        switch (dev->subsystem_device) {
        case 0x1049: /* Prelude Diva 1 */
        case 0x1223: /* Superdome */
        case 0x1226: /* Keystone */
        case 0x1282: /* Everest / Longs Peak */
                board->num_ports = 3;
                break;
        case 0x104A: /* Prelude Diva 2 */
                board->num_ports = 2;
                break;
        case 0x104B: /* Maestro */
                board->num_ports = 4;
                break;
        case 0x1227: /* Powerbar */
                board->num_ports = 1;
                break;
        }
 
        return 0;
}
 
static int __devinit
pci_xircom_fn(struct pci_dev *dev, struct pci_board *board, int enable)
{
        __set_current_state(TASK_UNINTERRUPTIBLE);
        schedule_timeout(HZ/10);
        return 0;
}
 
/*
 * This is the configuration table for all of the PCI serial boards
 * which we support.  It is directly indexed by the pci_board_num_t enum
 * value, which is encoded in the pci_device_id PCI probe table's
 * driver_data member.
 */
enum pci_board_num_t {
        pbn_b0_1_115200,
        pbn_default = 0,
 
        pbn_b0_2_115200,
        pbn_b0_4_115200,
 
        pbn_b0_1_921600,
        pbn_b0_2_921600,
        pbn_b0_4_921600,
 
        pbn_b0_bt_1_115200,
        pbn_b0_bt_2_115200,
        pbn_b0_bt_1_460800,
        pbn_b0_bt_2_460800,
        pbn_b0_bt_2_921600,
 
        pbn_b1_1_115200,
        pbn_b1_2_115200,
        pbn_b1_4_115200,
        pbn_b1_8_115200,
 
        pbn_b1_2_921600,
        pbn_b1_4_921600,
        pbn_b1_8_921600,
 
        pbn_b1_2_1382400,
        pbn_b1_4_1382400,
        pbn_b1_8_1382400,
 
        pbn_b2_1_115200,
        pbn_b2_8_115200,
        pbn_b2_4_460800,
        pbn_b2_8_460800,
        pbn_b2_16_460800,
        pbn_b2_4_921600,
        pbn_b2_8_921600,
 
        pbn_b2_bt_1_115200,
        pbn_b2_bt_2_115200,
        pbn_b2_bt_4_115200,
        pbn_b2_bt_2_921600,
 
        pbn_panacom,
        pbn_panacom2,
        pbn_panacom4,
        pbn_plx_romulus,
        pbn_oxsemi,
        pbn_timedia,
        pbn_intel_i960,
        pbn_sgi_ioc3,
        pbn_hp_diva,
#ifdef CONFIG_DDB5074
        pbn_nec_nile4,
#endif
 
        pbn_dci_pccom4,
        pbn_dci_pccom8,
 
        pbn_xircom_combo,
 
        pbn_siig10x_0,
        pbn_siig10x_1,
        pbn_siig10x_2,
        pbn_siig10x_4,
        pbn_siig20x_0,
        pbn_siig20x_2,
        pbn_siig20x_4,
 
        pbn_computone_4,
        pbn_computone_6,
        pbn_computone_8,
};
 
static struct pci_board pci_boards[] __devinitdata = {
        /*
         * PCI Flags, Number of Ports, Base (Maximum) Baud Rate,
         * Offset to get to next UART's registers,
         * Register shift to use for memory-mapped I/O,
         * Initialization function, first UART offset
         */
 
        /* Generic serial board, pbn_b0_1_115200, pbn_default */
        { SPCI_FL_BASE0, 1, 115200 },           /* pbn_b0_1_115200,
                                                   pbn_default */
 
        { SPCI_FL_BASE0, 2, 115200 },           /* pbn_b0_2_115200 */
        { SPCI_FL_BASE0, 4, 115200 },           /* pbn_b0_4_115200 */
 
        { SPCI_FL_BASE0, 1, 921600 },           /* pbn_b0_1_921600 */
        { SPCI_FL_BASE0, 2, 921600 },           /* pbn_b0_2_921600 */
        { SPCI_FL_BASE0, 4, 921600 },           /* pbn_b0_4_921600 */
 
        { SPCI_FL_BASE0 | SPCI_FL_BASE_TABLE, 1, 115200 }, /* pbn_b0_bt_1_115200 */
        { SPCI_FL_BASE0 | SPCI_FL_BASE_TABLE, 2, 115200 }, /* pbn_b0_bt_2_115200 */
        { SPCI_FL_BASE0 | SPCI_FL_BASE_TABLE, 1, 460800 }, /* pbn_b0_bt_1_460800 */
        { SPCI_FL_BASE0 | SPCI_FL_BASE_TABLE, 2, 460800 }, /* pbn_b0_bt_2_460800 */
        { SPCI_FL_BASE0 | SPCI_FL_BASE_TABLE, 2, 921600 }, /* pbn_b0_bt_2_921600 */
 
        { SPCI_FL_BASE1, 1, 115200 },           /* pbn_b1_1_115200 */
        { SPCI_FL_BASE1, 2, 115200 },           /* pbn_b1_2_115200 */
        { SPCI_FL_BASE1, 4, 115200 },           /* pbn_b1_4_115200 */
        { SPCI_FL_BASE1, 8, 115200 },           /* pbn_b1_8_115200 */
 
        { SPCI_FL_BASE1, 2, 921600 },           /* pbn_b1_2_921600 */
        { SPCI_FL_BASE1, 4, 921600 },           /* pbn_b1_4_921600 */
        { SPCI_FL_BASE1, 8, 921600 },           /* pbn_b1_8_921600 */
 
        { SPCI_FL_BASE1, 2, 1382400 },          /* pbn_b1_2_1382400 */
        { SPCI_FL_BASE1, 4, 1382400 },          /* pbn_b1_4_1382400 */
        { SPCI_FL_BASE1, 8, 1382400 },          /* pbn_b1_8_1382400 */
 
        { SPCI_FL_BASE2, 1, 115200 },           /* pbn_b2_1_115200 */
        { SPCI_FL_BASE2, 8, 115200 },           /* pbn_b2_8_115200 */
        { SPCI_FL_BASE2, 4, 460800 },           /* pbn_b2_4_460800 */
        { SPCI_FL_BASE2, 8, 460800 },           /* pbn_b2_8_460800 */
        { SPCI_FL_BASE2, 16, 460800 },          /* pbn_b2_16_460800 */
        { SPCI_FL_BASE2, 4, 921600 },           /* pbn_b2_4_921600 */
        { SPCI_FL_BASE2, 8, 921600 },           /* pbn_b2_8_921600 */
 
        { SPCI_FL_BASE2 | SPCI_FL_BASE_TABLE, 1, 115200 }, /* pbn_b2_bt_1_115200 */
        { SPCI_FL_BASE2 | SPCI_FL_BASE_TABLE, 2, 115200 }, /* pbn_b2_bt_2_115200 */
        { SPCI_FL_BASE2 | SPCI_FL_BASE_TABLE, 4, 115200 }, /* pbn_b2_bt_4_115200 */
        { SPCI_FL_BASE2 | SPCI_FL_BASE_TABLE, 2, 921600 }, /* pbn_b2_bt_2_921600 */
 
        { SPCI_FL_BASE2, 2, 921600, /* IOMEM */            /* pbn_panacom */
                0x400, 7, pci_plx9050_fn },
        { SPCI_FL_BASE2 | SPCI_FL_BASE_TABLE, 2, 921600,   /* pbn_panacom2 */
                0x400, 7, pci_plx9050_fn },
        { SPCI_FL_BASE2 | SPCI_FL_BASE_TABLE, 4, 921600,   /* pbn_panacom4 */
                0x400, 7, pci_plx9050_fn },
        { SPCI_FL_BASE2, 4, 921600,                        /* pbn_plx_romulus */
                0x20, 2, pci_plx9050_fn, 0x03 },
                /* This board uses the size of PCI Base region 0 to
                 * signal now many ports are available */
        { SPCI_FL_BASE0 | SPCI_FL_REGION_SZ_CAP, 32, 115200 }, /* pbn_oxsemi */
        { SPCI_FL_BASE_TABLE, 1, 921600,                   /* pbn_timedia */
                0, 0, pci_timedia_fn },
        /* EKF addition for i960 Boards form EKF with serial port */
        { SPCI_FL_BASE0, 32, 921600, /* max 256 ports */   /* pbn_intel_i960 */
                8<<2, 2, pci_inteli960ni_fn, 0x10000},
        { SPCI_FL_BASE0 | SPCI_FL_IRQRESOURCE,             /* pbn_sgi_ioc3 */
                1, 458333, 0, 0, 0, 0x20178 },
        { SPCI_FL_BASE0, 5, 115200, 8, 0, pci_hp_diva, 0},   /* pbn_hp_diva */
#ifdef CONFIG_DDB5074
        /*
         * NEC Vrc-5074 (Nile 4) builtin UART.
         * Conditionally compiled in since this is a motherboard device.
         */
        { SPCI_FL_BASE0, 1, 520833,                        /* pbn_nec_nile4 */
                64, 3, NULL, 0x300 },
#endif
 
        {SPCI_FL_BASE3, 4, 115200, 8},                     /* pbn_dci_pccom4 */
        {SPCI_FL_BASE3, 8, 115200, 8},                     /* pbn_dci_pccom8 */
 
        { SPCI_FL_BASE0, 1, 115200,                       /* pbn_xircom_combo */
                0, 0, pci_xircom_fn },
 
        { SPCI_FL_BASE2, 1, 460800,                        /* pbn_siig10x_0 */
                0, 0, pci_siig10x_fn },
        { SPCI_FL_BASE2, 1, 921600,                        /* pbn_siig10x_1 */
                0, 0, pci_siig10x_fn },
        { SPCI_FL_BASE2 | SPCI_FL_BASE_TABLE, 2, 921600,   /* pbn_siig10x_2 */
                0, 0, pci_siig10x_fn },
        { SPCI_FL_BASE2 | SPCI_FL_BASE_TABLE, 4, 921600,   /* pbn_siig10x_4 */
                0, 0, pci_siig10x_fn },
        { SPCI_FL_BASE0, 1, 921600,                        /* pbn_siix20x_0 */
                0, 0, pci_siig20x_fn },
        { SPCI_FL_BASE0 | SPCI_FL_BASE_TABLE, 2, 921600,   /* pbn_siix20x_2 */
                0, 0, pci_siig20x_fn },
        { SPCI_FL_BASE0 | SPCI_FL_BASE_TABLE, 4, 921600,   /* pbn_siix20x_4 */
                0, 0, pci_siig20x_fn },
 
        { SPCI_FL_BASE0, 4, 921600, /* IOMEM */            /* pbn_computone_4 */
                0x40, 2, NULL, 0x200 },
        { SPCI_FL_BASE0, 6, 921600, /* IOMEM */            /* pbn_computone_6 */
                0x40, 2, NULL, 0x200 },
        { SPCI_FL_BASE0, 8, 921600, /* IOMEM */            /* pbn_computone_8 */
                0x40, 2, NULL, 0x200 },
};
 
/*
 * Given a complete unknown PCI device, try to use some heuristics to
 * guess what the configuration might be, based on the pitiful PCI
 * serial specs.  Returns 0 on success, 1 on failure.
 */
static int __devinit serial_pci_guess_board(struct pci_dev *dev,
                                           struct pci_board *board)
{
        int     num_iomem = 0, num_port = 0, first_port = -1;
        int     i;
 
        /*
         * If it is not a communications device or the programming
         * interface is greater than 6, give up.
         *
         * (Should we try to make guesses for multiport serial devices
         * later?)
         */
        if ((((dev->class >> 8) != PCI_CLASS_COMMUNICATION_SERIAL) &&
            ((dev->class >> 8) != PCI_CLASS_COMMUNICATION_MODEM)) ||
            (dev->class & 0xff) > 6)
                return 1;
 
        for (i=0; i < 6; i++) {
                if (IS_PCI_REGION_IOPORT(dev, i)) {
                        num_port++;
                        if (first_port == -1)
                                first_port = i;
                }
                if (IS_PCI_REGION_IOMEM(dev, i))
                        num_iomem++;
        }
 
        /*
         * If there is 1 or 0 iomem regions, and exactly one port, use
         * it.
         */
        if (num_iomem <= 1 && num_port == 1) {
                board->flags = first_port;
                return 0;
        }
        return 1;
}
 
static int __devinit serial_init_one(struct pci_dev *dev,
                                     const struct pci_device_id *ent)
{
        struct pci_board *board, tmp;
        int rc;
 
        board = &pci_boards[ent->driver_data];
 
        rc = pci_enable_device(dev);
        if (rc) return rc;
 
        if (ent->driver_data == pbn_default &&
            serial_pci_guess_board(dev, board))
                return -ENODEV;
        else if (serial_pci_guess_board(dev, &tmp) == 0) {
                printk(KERN_INFO "Redundant entry in serial pci_table.  "
                       "Please send the output of\n"
                       "lspci -vv, this message (%04x,%04x,%04x,%04x)\n"
                       "and the manufacturer and name of "
                       "serial board or modem board\n"
                       "to serial-pci-info@lists.sourceforge.net.\n",
                       dev->vendor, dev->device,
                       pci_get_subvendor(dev), pci_get_subdevice(dev));
        }
 
        start_pci_pnp_board(dev, board);
 
        return 0;
}
 
static void __devexit serial_remove_one(struct pci_dev *dev)
{
        int     i;
 
        /*
         * Iterate through all of the ports finding those that belong
         * to this PCI device.
         */
        for(i = 0; i < NR_PORTS; i++) {
                if (rs_table[i].dev != dev)
                        continue;
                unregister_serial(i);
                rs_table[i].dev = 0;
        }
        /*
         * Now execute any board-specific shutdown procedure
         */
        for (i=0; i < NR_PCI_BOARDS; i++) {
                struct pci_board_inst *brd = &serial_pci_board[i];
 
                if (serial_pci_board[i].dev != dev)
                        continue;
                if (brd->board.init_fn)
                        (brd->board.init_fn)(brd->dev, &brd->board, 0);
                if (DEACTIVATE_FUNC(brd->dev))
                        (DEACTIVATE_FUNC(brd->dev))(brd->dev);
                serial_pci_board[i].dev = 0;
        }
}
 
 
static struct pci_device_id serial_pci_tbl[] __devinitdata = {
        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V960,
                PCI_SUBVENDOR_ID_CONNECT_TECH,
                PCI_SUBDEVICE_ID_CONNECT_TECH_BH8_232, 0, 0,
                pbn_b1_8_1382400 },
        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V960,
                PCI_SUBVENDOR_ID_CONNECT_TECH,
                PCI_SUBDEVICE_ID_CONNECT_TECH_BH4_232, 0, 0,
                pbn_b1_4_1382400 },
        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V960,
                PCI_SUBVENDOR_ID_CONNECT_TECH,
                PCI_SUBDEVICE_ID_CONNECT_TECH_BH2_232, 0, 0,
                pbn_b1_2_1382400 },
        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
                PCI_SUBVENDOR_ID_CONNECT_TECH,
                PCI_SUBDEVICE_ID_CONNECT_TECH_BH8_232, 0, 0,
                pbn_b1_8_1382400 },
        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
                PCI_SUBVENDOR_ID_CONNECT_TECH,
                PCI_SUBDEVICE_ID_CONNECT_TECH_BH4_232, 0, 0,
                pbn_b1_4_1382400 },
        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
                PCI_SUBVENDOR_ID_CONNECT_TECH,
                PCI_SUBDEVICE_ID_CONNECT_TECH_BH2_232, 0, 0,
                pbn_b1_2_1382400 },
        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
                PCI_SUBVENDOR_ID_CONNECT_TECH,
                PCI_SUBDEVICE_ID_CONNECT_TECH_BH8_485, 0, 0,
                pbn_b1_8_921600 },
        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
                PCI_SUBVENDOR_ID_CONNECT_TECH,
                PCI_SUBDEVICE_ID_CONNECT_TECH_BH8_485_4_4, 0, 0,
                pbn_b1_8_921600 },
        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
                PCI_SUBVENDOR_ID_CONNECT_TECH,
                PCI_SUBDEVICE_ID_CONNECT_TECH_BH4_485, 0, 0,
                pbn_b1_4_921600 },
        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
                PCI_SUBVENDOR_ID_CONNECT_TECH,
                PCI_SUBDEVICE_ID_CONNECT_TECH_BH4_485_2_2, 0, 0,
                pbn_b1_4_921600 },
        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
                PCI_SUBVENDOR_ID_CONNECT_TECH,
                PCI_SUBDEVICE_ID_CONNECT_TECH_BH2_485, 0, 0,
                pbn_b1_2_921600 },
        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
                PCI_SUBVENDOR_ID_CONNECT_TECH,
                PCI_SUBDEVICE_ID_CONNECT_TECH_BH8_485_2_6, 0, 0,
                pbn_b1_8_921600 },
        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
                PCI_SUBVENDOR_ID_CONNECT_TECH,
                PCI_SUBDEVICE_ID_CONNECT_TECH_BH081101V1, 0, 0,
                pbn_b1_8_921600 },
        {       PCI_VENDOR_ID_V3, PCI_DEVICE_ID_V3_V351,
                PCI_SUBVENDOR_ID_CONNECT_TECH,
                PCI_SUBDEVICE_ID_CONNECT_TECH_BH041101V1, 0, 0,
                pbn_b1_4_921600 },
 
        {       PCI_VENDOR_ID_SEALEVEL, PCI_DEVICE_ID_SEALEVEL_U530,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b2_bt_1_115200 },
        {       PCI_VENDOR_ID_SEALEVEL, PCI_DEVICE_ID_SEALEVEL_UCOMM2,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b2_bt_2_115200 },
        {       PCI_VENDOR_ID_SEALEVEL, PCI_DEVICE_ID_SEALEVEL_UCOMM422,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b2_bt_4_115200 },
        {       PCI_VENDOR_ID_SEALEVEL, PCI_DEVICE_ID_SEALEVEL_UCOMM232,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b2_bt_2_115200 },
        {       PCI_VENDOR_ID_SEALEVEL, PCI_DEVICE_ID_SEALEVEL_COMM4,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b2_bt_4_115200 },
        {       PCI_VENDOR_ID_SEALEVEL, PCI_DEVICE_ID_SEALEVEL_COMM8,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b2_8_115200 },
 
        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_GTEK_SERIAL2,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b2_bt_2_115200 },
        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_SPCOM200,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b2_bt_2_921600 },
        /* VScom SPCOM800, from sl@s.pl */
        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_SPCOM800,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b2_8_921600 },
        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_1077,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b2_4_921600 },
        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050,
                PCI_SUBVENDOR_ID_KEYSPAN,
                PCI_SUBDEVICE_ID_KEYSPAN_SX2, 0, 0,
                pbn_panacom },
        {       PCI_VENDOR_ID_PANACOM, PCI_DEVICE_ID_PANACOM_QUADMODEM,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_panacom4 },
        {       PCI_VENDOR_ID_PANACOM, PCI_DEVICE_ID_PANACOM_DUALMODEM,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_panacom2 },
        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050,
                PCI_SUBVENDOR_ID_CHASE_PCIFAST,
                PCI_SUBDEVICE_ID_CHASE_PCIFAST4, 0, 0,
                pbn_b2_4_460800 },
        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050,
                PCI_SUBVENDOR_ID_CHASE_PCIFAST,
                PCI_SUBDEVICE_ID_CHASE_PCIFAST8, 0, 0,
                pbn_b2_8_460800 },
        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050,
                PCI_SUBVENDOR_ID_CHASE_PCIFAST,
                PCI_SUBDEVICE_ID_CHASE_PCIFAST16, 0, 0,
                pbn_b2_16_460800 },
        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050,
                PCI_SUBVENDOR_ID_CHASE_PCIFAST,
                PCI_SUBDEVICE_ID_CHASE_PCIFAST16FMC, 0, 0,
                pbn_b2_16_460800 },
        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050,
                PCI_SUBVENDOR_ID_CHASE_PCIRAS,
                PCI_SUBDEVICE_ID_CHASE_PCIRAS4, 0, 0,
                pbn_b2_4_460800 },
        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050,
                PCI_SUBVENDOR_ID_CHASE_PCIRAS,
                PCI_SUBDEVICE_ID_CHASE_PCIRAS8, 0, 0,
                pbn_b2_8_460800 },
        /* Megawolf Romulus PCI Serial Card, from Mike Hudson */
        /* (Exoray@isys.ca) */
        {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_ROMULUS,
                0x10b5, 0x106a, 0, 0,
                pbn_plx_romulus },
        {       PCI_VENDOR_ID_QUATECH, PCI_DEVICE_ID_QUATECH_QSC100,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b1_4_115200 },
        {       PCI_VENDOR_ID_QUATECH, PCI_DEVICE_ID_QUATECH_DSC100,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b1_2_115200 },
        {       PCI_VENDOR_ID_QUATECH, PCI_DEVICE_ID_QUATECH_ESC100D,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b1_8_115200 },
        {       PCI_VENDOR_ID_QUATECH, PCI_DEVICE_ID_QUATECH_ESC100M,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b1_8_115200 },
        {       PCI_VENDOR_ID_SPECIALIX, PCI_DEVICE_ID_OXSEMI_16PCI954,
                PCI_VENDOR_ID_SPECIALIX, PCI_SUBDEVICE_ID_SPECIALIX_SPEED4, 0, 0,
                pbn_b0_4_921600 },
        {       PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_16PCI954,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b0_4_115200 },
        {       PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_16PCI952,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b0_bt_2_921600 },
 
        /* Digitan DS560-558, from jimd@esoft.com */
        {       PCI_VENDOR_ID_ATT, PCI_DEVICE_ID_ATT_VENUS_MODEM,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b1_1_115200 },
 
        /* 3Com US Robotics 56k Voice Internal PCI model 5610 */
        {       PCI_VENDOR_ID_USR, 0x1008,
                PCI_ANY_ID, PCI_ANY_ID, },
 
        /* Titan Electronic cards */
        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_100,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b0_1_921600 },
        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_200,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b0_2_921600 },
        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_400,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b0_4_921600 },
        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_800B,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b0_4_921600 },
        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_100L,
                PCI_ANY_ID, PCI_ANY_ID,
                SPCI_FL_BASE1, 1, 921600 },
        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_200L,
                PCI_ANY_ID, PCI_ANY_ID,
                SPCI_FL_BASE1 | SPCI_FL_BASE_TABLE, 2, 921600 },
        /* The 400L and 800L have a custom hack in get_pci_port */
        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_400L,
                PCI_ANY_ID, PCI_ANY_ID,
                SPCI_FL_BASE_TABLE, 4, 921600 },
        {       PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_800L,
                PCI_ANY_ID, PCI_ANY_ID,
                SPCI_FL_BASE_TABLE, 8, 921600 },
 
        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_1S_10x_550,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_siig10x_0 },
        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_1S_10x_650,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_siig10x_0 },
        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_1S_10x_850,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_siig10x_0 },
        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2S_10x_550,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_siig10x_2 },
        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2S_10x_650,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_siig10x_2 },
        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2S_10x_850,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_siig10x_2 },
        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_4S_10x_550,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_siig10x_4 },
        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_4S_10x_650,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_siig10x_4 },
        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_4S_10x_850,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_siig10x_4 },
        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_1S_20x_550,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_siig20x_0 },
        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_1S_20x_650,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_siig20x_0 },
        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_1S_20x_850,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_siig20x_0 },
        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2S_20x_550,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_siig20x_2 },
        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2S_20x_650,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_siig20x_2 },
        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2S_20x_850,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_siig20x_2 },
        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_4S_20x_550,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_siig20x_4 },
        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_4S_20x_650,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_siig20x_4 },
        {       PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_4S_20x_850,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_siig20x_4 },
 
        /* Computone devices submitted by Doug McNash dmcnash@computone.com */
        {       PCI_VENDOR_ID_COMPUTONE, PCI_DEVICE_ID_COMPUTONE_PG,
                PCI_SUBVENDOR_ID_COMPUTONE, PCI_SUBDEVICE_ID_COMPUTONE_PG4,
                0, 0, pbn_computone_4 },
        {       PCI_VENDOR_ID_COMPUTONE, PCI_DEVICE_ID_COMPUTONE_PG,
                PCI_SUBVENDOR_ID_COMPUTONE, PCI_SUBDEVICE_ID_COMPUTONE_PG8,
                0, 0, pbn_computone_8 },
        {       PCI_VENDOR_ID_COMPUTONE, PCI_DEVICE_ID_COMPUTONE_PG,
                PCI_SUBVENDOR_ID_COMPUTONE, PCI_SUBDEVICE_ID_COMPUTONE_PG6,
                0, 0, pbn_computone_6 },
 
        {       PCI_VENDOR_ID_OXSEMI, PCI_DEVICE_ID_OXSEMI_16PCI95N,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0, pbn_oxsemi },
        {       PCI_VENDOR_ID_TIMEDIA, PCI_DEVICE_ID_TIMEDIA_1889,
                PCI_VENDOR_ID_TIMEDIA, PCI_ANY_ID, 0, 0, pbn_timedia },
 
        {       PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_DSERIAL,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b0_bt_2_115200 },
        {       PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_QUATRO_A,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b0_bt_2_115200 },
        {       PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_QUATRO_B,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b0_bt_2_115200 },
        {       PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_PORT_PLUS,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b0_bt_2_460800 },
        {       PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_QUAD_A,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b0_bt_2_460800 },
        {       PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_QUAD_B,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b0_bt_2_460800 },
        {       PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_SSERIAL,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b0_bt_1_115200 },
        {       PCI_VENDOR_ID_LAVA, PCI_DEVICE_ID_LAVA_PORT_650,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b0_bt_1_460800 },
 
        /* RAStel 2 port modem, gerg@moreton.com.au */
        {       PCI_VENDOR_ID_MORETON, PCI_DEVICE_ID_RASTEL_2PORT,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b2_bt_2_115200 },
 
        /* EKF addition for i960 Boards form EKF with serial port */
        {       PCI_VENDOR_ID_INTEL, 0x1960,
                0xE4BF, PCI_ANY_ID, 0, 0,
                pbn_intel_i960 },
 
        /* Xircom Cardbus/Ethernet combos */
        {       PCI_VENDOR_ID_XIRCOM, PCI_DEVICE_ID_XIRCOM_X3201_MDM,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_xircom_combo },
 
        /*
         * Untested PCI modems, sent in from various folks...
         */
 
        /* Elsa Model 56K PCI Modem, from Andreas Rath <arh@01019freenet.de> */
        {       PCI_VENDOR_ID_ROCKWELL, 0x1004,
                0x1048, 0x1500, 0, 0,
                pbn_b1_1_115200 },
 
        {       PCI_VENDOR_ID_SGI, PCI_DEVICE_ID_SGI_IOC3,
                0xFF00, 0, 0, 0,
                pbn_sgi_ioc3 },
 
        /* HP Diva card */
        {       PCI_VENDOR_ID_HP, PCI_DEVICE_ID_HP_SAS,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_hp_diva },
        {       PCI_VENDOR_ID_HP, 0x1290,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_b2_1_115200 },
 
#ifdef CONFIG_DDB5074
        /*
         * NEC Vrc-5074 (Nile 4) builtin UART.
         * Conditionally compiled in since this is a motherboard device.
         */
        {       PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_NILE4,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_nec_nile4 },
#endif
 
        {       PCI_VENDOR_ID_DCI, PCI_DEVICE_ID_DCI_PCCOM4,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_dci_pccom4 },
        {       PCI_VENDOR_ID_DCI, PCI_DEVICE_ID_DCI_PCCOM8,
                PCI_ANY_ID, PCI_ANY_ID, 0, 0,
                pbn_dci_pccom8 },
 
       { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
         PCI_CLASS_COMMUNICATION_SERIAL << 8, 0xffff00, },
       { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
         PCI_CLASS_COMMUNICATION_MODEM << 8, 0xffff00, },
       { 0, }
};
 
MODULE_DEVICE_TABLE(pci, serial_pci_tbl);
 
static struct pci_driver serial_pci_driver = {
       name:           "serial",
       probe:          serial_init_one,
       remove:         __devexit_p(serial_remove_one),
       id_table:       serial_pci_tbl,
};
 
 
/*
 * 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 __devinit probe_serial_pci(void)
{
#ifdef SERIAL_DEBUG_PCI
        printk(KERN_DEBUG "Entered probe_serial_pci()\n");
#endif
 
        /* Register call PCI serial devices.  Null out
         * the driver name upon failure, as a signal
         * not to attempt to unregister the driver later
         */
        if (pci_module_init (&serial_pci_driver) != 0)
                serial_pci_driver.name = "";
 
#ifdef SERIAL_DEBUG_PCI
        printk(KERN_DEBUG "Leaving probe_serial_pci() (probe finished)\n");
#endif
        return;
}
 
#endif /* ENABLE_SERIAL_PCI */
 
#ifdef ENABLE_SERIAL_PNP
 
struct pnp_board {
        unsigned short vendor;
        unsigned short device;
};
 
static struct pnp_board pnp_devices[] __devinitdata = {
        /* Archtek America Corp. */
        /* Archtek SmartLink Modem 3334BT Plug & Play */
        {       ISAPNP_VENDOR('A', 'A', 'C'), ISAPNP_DEVICE(0x000F) },
        /* Anchor Datacomm BV */
        /* SXPro 144 External Data Fax Modem Plug & Play */
        {       ISAPNP_VENDOR('A', 'D', 'C'), ISAPNP_DEVICE(0x0001) },
        /* SXPro 288 External Data Fax Modem Plug & Play */
        {       ISAPNP_VENDOR('A', 'D', 'C'), ISAPNP_DEVICE(0x0002) },
        /* Rockwell 56K ACF II Fax+Data+Voice Modem */
        {       ISAPNP_VENDOR('A', 'K', 'Y'), ISAPNP_DEVICE(0x1021) },
        /* AZT3005 PnP SOUND DEVICE */
        {       ISAPNP_VENDOR('A', 'Z', 'T'), ISAPNP_DEVICE(0x4001) },
        /* Best Data Products Inc. Smart One 336F PnP Modem */
        {       ISAPNP_VENDOR('B', 'D', 'P'), ISAPNP_DEVICE(0x3336) },
        /*  Boca Research */
        /* Boca Complete Ofc Communicator 14.4 Data-FAX */
        {       ISAPNP_VENDOR('B', 'R', 'I'), ISAPNP_DEVICE(0x0A49) },
        /* Boca Research 33,600 ACF Modem */
        {       ISAPNP_VENDOR('B', 'R', 'I'), ISAPNP_DEVICE(0x1400) },
        /* Boca 33.6 Kbps Internal FD34FSVD */
        {       ISAPNP_VENDOR('B', 'R', 'I'), ISAPNP_DEVICE(0x3400) },
        /* Boca 33.6 Kbps Internal FD34FSVD */
        {       ISAPNP_VENDOR('B', 'R', 'I'), ISAPNP_DEVICE(0x0A49) },
        /* Best Data Products Inc. Smart One 336F PnP Modem */
        {       ISAPNP_VENDOR('B', 'D', 'P'), ISAPNP_DEVICE(0x3336) },
        /* Computer Peripherals Inc */
        /* EuroViVa CommCenter-33.6 SP PnP */
        {       ISAPNP_VENDOR('C', 'P', 'I'), ISAPNP_DEVICE(0x4050) },
        /* Creative Labs */
        /* Creative Labs Phone Blaster 28.8 DSVD PnP Voice */
        {       ISAPNP_VENDOR('C', 'T', 'L'), ISAPNP_DEVICE(0x3001) },
        /* Creative Labs Modem Blaster 28.8 DSVD PnP Voice */
        {       ISAPNP_VENDOR('C', 'T', 'L'), ISAPNP_DEVICE(0x3011) },
        /* Creative */
        /* Creative Modem Blaster Flash56 DI5601-1 */
        {       ISAPNP_VENDOR('D', 'M', 'B'), ISAPNP_DEVICE(0x1032) },
        /* Creative Modem Blaster V.90 DI5660 */
        {       ISAPNP_VENDOR('D', 'M', 'B'), ISAPNP_DEVICE(0x2001) },
        /* FUJITSU */
        /* Fujitsu 33600 PnP-I2 R Plug & Play */
        {       ISAPNP_VENDOR('F', 'U', 'J'), ISAPNP_DEVICE(0x0202) },
        /* Fujitsu FMV-FX431 Plug & Play */
        {       ISAPNP_VENDOR('F', 'U', 'J'), ISAPNP_DEVICE(0x0205) },
        /* Fujitsu 33600 PnP-I4 R Plug & Play */
        {       ISAPNP_VENDOR('F', 'U', 'J'), ISAPNP_DEVICE(0x0206) },
        /* Fujitsu Fax Voice 33600 PNP-I5 R Plug & Play */
        {       ISAPNP_VENDOR('F', 'U', 'J'), ISAPNP_DEVICE(0x0209) },
        /* Archtek America Corp. */
        /* Archtek SmartLink Modem 3334BT Plug & Play */
        {       ISAPNP_VENDOR('G', 'V', 'C'), ISAPNP_DEVICE(0x000F) },
        /* Hayes */
        /* Hayes Optima 288 V.34-V.FC + FAX + Voice Plug & Play */
        {       ISAPNP_VENDOR('H', 'A', 'Y'), ISAPNP_DEVICE(0x0001) },
        /* Hayes Optima 336 V.34 + FAX + Voice PnP */
        {       ISAPNP_VENDOR('H', 'A', 'Y'), ISAPNP_DEVICE(0x000C) },
        /* Hayes Optima 336B V.34 + FAX + Voice PnP */
        {       ISAPNP_VENDOR('H', 'A', 'Y'), ISAPNP_DEVICE(0x000D) },
        /* Hayes Accura 56K Ext Fax Modem PnP */
        {       ISAPNP_VENDOR('H', 'A', 'Y'), ISAPNP_DEVICE(0x5670) },
        /* Hayes Accura 56K Ext Fax Modem PnP */
        {       ISAPNP_VENDOR('H', 'A', 'Y'), ISAPNP_DEVICE(0x5674) },
        /* Hayes Accura 56K Fax Modem PnP */
        {       ISAPNP_VENDOR('H', 'A', 'Y'), ISAPNP_DEVICE(0x5675) },
        /* Hayes 288, V.34 + FAX */
        {       ISAPNP_VENDOR('H', 'A', 'Y'), ISAPNP_DEVICE(0xF000) },
        /* Hayes Optima 288 V.34 + FAX + Voice, Plug & Play */
        {       ISAPNP_VENDOR('H', 'A', 'Y'), ISAPNP_DEVICE(0xF001) },
        /* IBM */
        /* IBM Thinkpad 701 Internal Modem Voice */
        {       ISAPNP_VENDOR('I', 'B', 'M'), ISAPNP_DEVICE(0x0033) },
        /* Intertex */
        /* Intertex 28k8 33k6 Voice EXT PnP */
        {       ISAPNP_VENDOR('I', 'X', 'D'), ISAPNP_DEVICE(0xC801) },
        /* Intertex 33k6 56k Voice EXT PnP */
        {       ISAPNP_VENDOR('I', 'X', 'D'), ISAPNP_DEVICE(0xC901) },
        /* Intertex 28k8 33k6 Voice SP EXT PnP */
        {       ISAPNP_VENDOR('I', 'X', 'D'), ISAPNP_DEVICE(0xD801) },
        /* Intertex 33k6 56k Voice SP EXT PnP */
        {       ISAPNP_VENDOR('I', 'X', 'D'), ISAPNP_DEVICE(0xD901) },
        /* Intertex 28k8 33k6 Voice SP INT PnP */
        {       ISAPNP_VENDOR('I', 'X', 'D'), ISAPNP_DEVICE(0xF401) },
        /* Intertex 28k8 33k6 Voice SP EXT PnP */
        {       ISAPNP_VENDOR('I', 'X', 'D'), ISAPNP_DEVICE(0xF801) },
        /* Intertex 33k6 56k Voice SP EXT PnP */
        {       ISAPNP_VENDOR('I', 'X', 'D'), ISAPNP_DEVICE(0xF901) },
        /* Kortex International */
        /* KORTEX 28800 Externe PnP */
        {       ISAPNP_VENDOR('K', 'O', 'R'), ISAPNP_DEVICE(0x4522) },
        /* KXPro 33.6 Vocal ASVD PnP */
        {       ISAPNP_VENDOR('K', 'O', 'R'), ISAPNP_DEVICE(0xF661) },
        /* Lasat */
        /* LASAT Internet 33600 PnP */
        {       ISAPNP_VENDOR('L', 'A', 'S'), ISAPNP_DEVICE(0x4040) },
        /* Lasat Safire 560 PnP */
        {       ISAPNP_VENDOR('L', 'A', 'S'), ISAPNP_DEVICE(0x4540) },
        /* Lasat Safire 336  PnP */
        {       ISAPNP_VENDOR('L', 'A', 'S'), ISAPNP_DEVICE(0x5440) },
        /* Microcom, Inc. */
        /* Microcom TravelPorte FAST V.34 Plug & Play */
        {       ISAPNP_VENDOR('M', 'N', 'P'), ISAPNP_DEVICE(0x281) },
        /* Microcom DeskPorte V.34 FAST or FAST+ Plug & Play */
        {       ISAPNP_VENDOR('M', 'N', 'P'), ISAPNP_DEVICE(0x0336) },
        /* Microcom DeskPorte FAST EP 28.8 Plug & Play */
        {       ISAPNP_VENDOR('M', 'N', 'P'), ISAPNP_DEVICE(0x0339) },
        /* Microcom DeskPorte 28.8P Plug & Play */
        {       ISAPNP_VENDOR('M', 'N', 'P'), ISAPNP_DEVICE(0x0342) },
        /* Microcom DeskPorte FAST ES 28.8 Plug & Play */
        {       ISAPNP_VENDOR('M', 'N', 'P'), ISAPNP_DEVICE(0x0500) },
        /* Microcom DeskPorte FAST ES 28.8 Plug & Play */
        {       ISAPNP_VENDOR('M', 'N', 'P'), ISAPNP_DEVICE(0x0501) },
        /* Microcom DeskPorte 28.8S Internal Plug & Play */
        {       ISAPNP_VENDOR('M', 'N', 'P'), ISAPNP_DEVICE(0x0502) },
        /* Motorola */
        /* Motorola BitSURFR Plug & Play */
        {       ISAPNP_VENDOR('M', 'O', 'T'), ISAPNP_DEVICE(0x1105) },
        /* Motorola TA210 Plug & Play */
        {       ISAPNP_VENDOR('M', 'O', 'T'), ISAPNP_DEVICE(0x1111) },
        /* Motorola HMTA 200 (ISDN) Plug & Play */
        {       ISAPNP_VENDOR('M', 'O', 'T'), ISAPNP_DEVICE(0x1114) },
        /* Motorola BitSURFR Plug & Play */
        {       ISAPNP_VENDOR('M', 'O', 'T'), ISAPNP_DEVICE(0x1115) },
        /* Motorola Lifestyle 28.8 Internal */
        {       ISAPNP_VENDOR('M', 'O', 'T'), ISAPNP_DEVICE(0x1190) },
        /* Motorola V.3400 Plug & Play */
        {       ISAPNP_VENDOR('M', 'O', 'T'), ISAPNP_DEVICE(0x1501) },
        /* Motorola Lifestyle 28.8 V.34 Plug & Play */
        {       ISAPNP_VENDOR('M', 'O', 'T'), ISAPNP_DEVICE(0x1502) },
        /* Motorola Power 28.8 V.34 Plug & Play */
        {       ISAPNP_VENDOR('M', 'O', 'T'), ISAPNP_DEVICE(0x1505) },
        /* Motorola ModemSURFR External 28.8 Plug & Play */
        {       ISAPNP_VENDOR('M', 'O', 'T'), ISAPNP_DEVICE(0x1509) },
        /* Motorola Premier 33.6 Desktop Plug & Play */
        {       ISAPNP_VENDOR('M', 'O', 'T'), ISAPNP_DEVICE(0x150A) },
        /* Motorola VoiceSURFR 56K External PnP */
        {       ISAPNP_VENDOR('M', 'O', 'T'), ISAPNP_DEVICE(0x150F) },
        /* Motorola ModemSURFR 56K External PnP */
        {       ISAPNP_VENDOR('M', 'O', 'T'), ISAPNP_DEVICE(0x1510) },
        /* Motorola ModemSURFR 56K Internal PnP */
        {       ISAPNP_VENDOR('M', 'O', 'T'), ISAPNP_DEVICE(0x1550) },
        /* Motorola ModemSURFR Internal 28.8 Plug & Play */
        {       ISAPNP_VENDOR('M', 'O', 'T'), ISAPNP_DEVICE(0x1560) },
        /* Motorola Premier 33.6 Internal Plug & Play */
        {       ISAPNP_VENDOR('M', 'O', 'T'), ISAPNP_DEVICE(0x1580) },
        /* Motorola OnlineSURFR 28.8 Internal Plug & Play */
        {       ISAPNP_VENDOR('M', 'O', 'T'), ISAPNP_DEVICE(0x15B0) },
        /* Motorola VoiceSURFR 56K Internal PnP */
        {       ISAPNP_VENDOR('M', 'O', 'T'), ISAPNP_DEVICE(0x15F0) },
        /* Com 1 */
        /*  Deskline K56 Phone System PnP */
        {       ISAPNP_VENDOR('M', 'V', 'X'), ISAPNP_DEVICE(0x00A1) },
        /* PC Rider K56 Phone System PnP */
        {       ISAPNP_VENDOR('M', 'V', 'X'), ISAPNP_DEVICE(0x00F2) },
        /* Pace 56 Voice Internal Plug & Play Modem */
        {       ISAPNP_VENDOR('P', 'M', 'C'), ISAPNP_DEVICE(0x2430) },
        /* Generic */
        /* Generic standard PC COM port  */
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0x0500) },
        /* Generic 16550A-compatible COM port */
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0x0501) },
        /* Compaq 14400 Modem */
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0xC000) },
        /* Compaq 2400/9600 Modem */
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0xC001) },
        /* Dial-Up Networking Serial Cable between 2 PCs */
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0xC031) },
        /* Dial-Up Networking Parallel Cable between 2 PCs */
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0xC032) },
        /* Standard 9600 bps Modem */
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0xC100) },
        /* Standard 14400 bps Modem */
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0xC101) },
        /*  Standard 28800 bps Modem*/
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0xC102) },
        /*  Standard Modem*/
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0xC103) },
        /*  Standard 9600 bps Modem*/
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0xC104) },
        /*  Standard 14400 bps Modem*/
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0xC105) },
        /*  Standard 28800 bps Modem*/
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0xC106) },
        /*  Standard Modem */
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0xC107) },
        /* Standard 9600 bps Modem */
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0xC108) },
        /* Standard 14400 bps Modem */
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0xC109) },
        /* Standard 28800 bps Modem */
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0xC10A) },
        /* Standard Modem */
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0xC10B) },
        /* Standard 9600 bps Modem */
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0xC10C) },
        /* Standard 14400 bps Modem */
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0xC10D) },
        /* Standard 28800 bps Modem */
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0xC10E) },
        /* Standard Modem */
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0xC10F) },
        /* Standard PCMCIA Card Modem */
        {       ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0x2000) },
        /* Rockwell */
        /* Modular Technology */
        /* Rockwell 33.6 DPF Internal PnP */
        /* Modular Technology 33.6 Internal PnP */
        {       ISAPNP_VENDOR('R', 'O', 'K'), ISAPNP_DEVICE(0x0030) },
        /* Kortex International */
        /* KORTEX 14400 Externe PnP */
        {       ISAPNP_VENDOR('R', 'O', 'K'), ISAPNP_DEVICE(0x0100) },
        /* Viking Components, Inc */
        /* Viking 28.8 INTERNAL Fax+Data+Voice PnP */
        {       ISAPNP_VENDOR('R', 'O', 'K'), ISAPNP_DEVICE(0x4920) },
        /* Rockwell */
        /* British Telecom */
        /* Modular Technology */
        /* Rockwell 33.6 DPF External PnP */
        /* BT Prologue 33.6 External PnP */
        /* Modular Technology 33.6 External PnP */
        {       ISAPNP_VENDOR('R', 'S', 'S'), ISAPNP_DEVICE(0x00A0) },
        /* Viking 56K FAX INT */
        {       ISAPNP_VENDOR('R', 'S', 'S'), ISAPNP_DEVICE(0x0262) },
        /* SupraExpress 28.8 Data/Fax PnP modem */
        {       ISAPNP_VENDOR('S', 'U', 'P'), ISAPNP_DEVICE(0x1310) },
        /* SupraExpress 33.6 Data/Fax PnP modem */
        {       ISAPNP_VENDOR('S', 'U', 'P'), ISAPNP_DEVICE(0x1421) },
        /* SupraExpress 33.6 Data/Fax PnP modem */
        {       ISAPNP_VENDOR('S', 'U', 'P'), ISAPNP_DEVICE(0x1590) },
        /* SupraExpress 33.6 Data/Fax PnP modem */
        {       ISAPNP_VENDOR('S', 'U', 'P'), ISAPNP_DEVICE(0x1760) },
        /* Phoebe Micro */
        /* Phoebe Micro 33.6 Data Fax 1433VQH Plug & Play */
        {       ISAPNP_VENDOR('T', 'E', 'X'), ISAPNP_DEVICE(0x0011) },
        /* Archtek America Corp. */
        /* Archtek SmartLink Modem 3334BT Plug & Play */
        {       ISAPNP_VENDOR('U', 'A', 'C'), ISAPNP_DEVICE(0x000F) },
        /* 3Com Corp. */
        /* Gateway Telepath IIvi 33.6 */
        {       ISAPNP_VENDOR('U', 'S', 'R'), ISAPNP_DEVICE(0x0000) },
        /*  Sportster Vi 14.4 PnP FAX Voicemail */
        {       ISAPNP_VENDOR('U', 'S', 'R'), ISAPNP_DEVICE(0x0004) },
        /* U.S. Robotics 33.6K Voice INT PnP */
        {       ISAPNP_VENDOR('U', 'S', 'R'), ISAPNP_DEVICE(0x0006) },
        /* U.S. Robotics 33.6K Voice EXT PnP */
        {       ISAPNP_VENDOR('U', 'S', 'R'), ISAPNP_DEVICE(0x0007) },
        /* U.S. Robotics 33.6K Voice INT PnP */
        {       ISAPNP_VENDOR('U', 'S', 'R'), ISAPNP_DEVICE(0x2002) },
        /* U.S. Robotics 56K Voice INT PnP */
        {       ISAPNP_VENDOR('U', 'S', 'R'), ISAPNP_DEVICE(0x2070) },
        /* U.S. Robotics 56K Voice EXT PnP */
        {       ISAPNP_VENDOR('U', 'S', 'R'), ISAPNP_DEVICE(0x2080) },
        /* U.S. Robotics 56K FAX INT */
        {       ISAPNP_VENDOR('U', 'S', 'R'), ISAPNP_DEVICE(0x3031) },
        /* U.S. Robotics 56K Voice INT PnP */
        {       ISAPNP_VENDOR('U', 'S', 'R'), ISAPNP_DEVICE(0x3070) },
        /* U.S. Robotics 56K Voice EXT PnP */
        {       ISAPNP_VENDOR('U', 'S', 'R'), ISAPNP_DEVICE(0x3080) },
        /* U.S. Robotics 56K Voice INT PnP */
        {       ISAPNP_VENDOR('U', 'S', 'R'), ISAPNP_DEVICE(0x3090) },
        /* U.S. Robotics 56K Message  */
        {       ISAPNP_VENDOR('U', 'S', 'R'), ISAPNP_DEVICE(0x9100) },
        /*  U.S. Robotics 56K FAX EXT PnP*/
        {       ISAPNP_VENDOR('U', 'S', 'R'), ISAPNP_DEVICE(0x9160) },
        /*  U.S. Robotics 56K FAX INT PnP*/
        {       ISAPNP_VENDOR('U', 'S', 'R'), ISAPNP_DEVICE(0x9170) },
        /*  U.S. Robotics 56K Voice EXT PnP*/
        {       ISAPNP_VENDOR('U', 'S', 'R'), ISAPNP_DEVICE(0x9180) },
        /*  U.S. Robotics 56K Voice INT PnP*/
        {       ISAPNP_VENDOR('U', 'S', 'R'), ISAPNP_DEVICE(0x9190) },
        {       0, }
};
 
static inline void avoid_irq_share(struct pci_dev *dev)
{
        int i, map = 0x1FF8;
        struct serial_state *state = rs_table;
        struct isapnp_irq *irq;
        struct isapnp_resources *res = dev->sysdata;
 
        for (i = 0; i < NR_PORTS; i++) {
                if (state->type != PORT_UNKNOWN)
                        clear_bit(state->irq, &map);
                state++;
        }
 
        for ( ; res; res = res->alt)
                for(irq = res->irq; irq; irq = irq->next)
                        irq->map = map;
}
 
static char *modem_names[] __devinitdata = {
       "MODEM", "Modem", "modem", "FAX", "Fax", "fax",
       "56K", "56k", "K56", "33.6", "28.8", "14.4",
       "33,600", "28,800", "14,400", "33.600", "28.800", "14.400",
       "33600", "28800", "14400", "V.90", "V.34", "V.32", 0
};
 
static int __devinit check_name(char *name)
{
       char **tmp = modem_names;
 
       while (*tmp) {
               if (strstr(name, *tmp))
                       return 1;
               tmp++;
       }
       return 0;
}
 
static inline int check_compatible_id(struct pci_dev *dev)
{
       int i;
       for (i = 0; i < DEVICE_COUNT_COMPATIBLE; i++)
               if ((dev->vendor_compatible[i] ==
                    ISAPNP_VENDOR('P', 'N', 'P')) &&
                   (swab16(dev->device_compatible[i]) >= 0xc000) &&
                   (swab16(dev->device_compatible[i]) <= 0xdfff))
                       return 0;
       return 1;
}
 
/*
 * Given a complete unknown ISA PnP device, try to use some heuristics to
 * detect modems. Currently use such heuristic set:
 *     - dev->name or dev->bus->name must contain "modem" substring;
 *     - device must have only one IO region (8 byte long) with base adress
 *       0x2e8, 0x3e8, 0x2f8 or 0x3f8.
 *
 * Such detection looks very ugly, but can detect at least some of numerous
 * ISA PnP modems, alternatively we must hardcode all modems in pnp_devices[]
 * table.
 */
static int _INLINE_ serial_pnp_guess_board(struct pci_dev *dev,
                                          struct pci_board *board)
{
       struct isapnp_resources *res = (struct isapnp_resources *)dev->sysdata;
       struct isapnp_resources *resa;
 
       if (!(check_name(dev->name) || check_name(dev->bus->name)) &&
           !(check_compatible_id(dev)))
               return 1;
 
       if (!res || res->next)
               return 1;
 
       for (resa = res->alt; resa; resa = resa->alt) {
               struct isapnp_port *port;
               for (port = res->port; port; port = port->next)
                       if ((port->size == 8) &&
                           ((port->min == 0x2f8) ||
                            (port->min == 0x3f8) ||
                            (port->min == 0x2e8) ||
                            (port->min == 0x3e8)))
                               return 0;
       }
 
       return 1;
}
 
static void __devinit probe_serial_pnp(void)
{
       struct pci_dev *dev = NULL;
       struct pnp_board *pnp_board;
       struct pci_board board;
 
#ifdef SERIAL_DEBUG_PNP
       printk("Entered probe_serial_pnp()\n");
#endif
       if (!isapnp_present()) {
#ifdef SERIAL_DEBUG_PNP
               printk("Leaving probe_serial_pnp() (no isapnp)\n");
#endif
               return;
       }
 
       isapnp_for_each_dev(dev) {
               if (dev->active)
                       continue;
 
               memset(&board, 0, sizeof(board));
               board.flags = SPCI_FL_BASE0 | SPCI_FL_PNPDEFAULT;
               board.num_ports = 1;
               board.base_baud = 115200;
 
               for (pnp_board = pnp_devices; pnp_board->vendor; pnp_board++)
                       if ((dev->vendor == pnp_board->vendor) &&
                           (dev->device == pnp_board->device))
                               break;
 
               if (pnp_board->vendor) {
                       /* Special case that's more efficient to hardcode */
                       if ((pnp_board->vendor == ISAPNP_VENDOR('A', 'K', 'Y') &&
                            pnp_board->device == ISAPNP_DEVICE(0x1021)))
                               board.flags |= SPCI_FL_NO_SHIRQ;
               } else {
                       if (serial_pnp_guess_board(dev, &board))
                               continue;
               }
 
               if (board.flags & SPCI_FL_NO_SHIRQ)
                       avoid_irq_share(dev);
               start_pci_pnp_board(dev, &board);
       }
 
#ifdef SERIAL_DEBUG_PNP
       printk("Leaving probe_serial_pnp() (probe finished)\n");
#endif
       return;
}
 
#endif /* ENABLE_SERIAL_PNP */
 
/*
 * The serial driver boot-time initialization code!
 */
static int __init rs_init(void)
{
        int i;
        struct serial_state * state;
 
        init_bh(SERIAL_BH, do_serial_bh);
        init_timer(&serial_timer);
        serial_timer.function = rs_timer;
        mod_timer(&serial_timer, jiffies + RS_STROBE_TIME);
 
        for (i = 0; i < NR_IRQS; i++) {
                IRQ_ports[i] = 0;
                IRQ_timeout[i] = 0;
#ifdef CONFIG_SERIAL_MULTIPORT
                memset(&rs_multiport[i], 0,
                       sizeof(struct rs_multiport_struct));
#endif
        }
#ifdef CONFIG_SERIAL_CONSOLE
        /*
         *      The interrupt of the serial console port
         *      can't be shared.
         */
        if (sercons.flags & CON_CONSDEV) {
                for(i = 0; i < NR_PORTS; i++)
                        if (i != sercons.index &&
                            rs_table[i].irq == rs_table[sercons.index].irq)
                                rs_table[i].irq = 0;
        }
#endif
        show_serial_version();
 
        /* Initialize the tty_driver structure */
 
        memset(&serial_driver, 0, sizeof(struct tty_driver));
        serial_driver.magic = TTY_DRIVER_MAGIC;
#if (LINUX_VERSION_CODE > 0x20100)
        serial_driver.driver_name = "serial";
#endif
#if (LINUX_VERSION_CODE > 0x2032D && defined(CONFIG_DEVFS_FS))
        serial_driver.name = "tts/%d";
#else
        serial_driver.name = "ttyS";
#endif
        serial_driver.major = TTY_MAJOR;
        serial_driver.minor_start = 64 + SERIAL_DEV_OFFSET;
        serial_driver.name_base = SERIAL_DEV_OFFSET;
        serial_driver.num = NR_PORTS;
        serial_driver.type = TTY_DRIVER_TYPE_SERIAL;
        serial_driver.subtype = SERIAL_TYPE_NORMAL;
        serial_driver.init_termios = tty_std_termios;
        serial_driver.init_termios.c_cflag =
                B9600 | CS8 | CREAD | HUPCL | CLOCAL;
        serial_driver.flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS;
        serial_driver.refcount = &serial_refcount;
        serial_driver.table = serial_table;
        serial_driver.termios = serial_termios;
        serial_driver.termios_locked = serial_termios_locked;
 
        serial_driver.open = rs_open;
        serial_driver.close = rs_close;
        serial_driver.write = rs_write;
        serial_driver.put_char = rs_put_char;
        serial_driver.flush_chars = rs_flush_chars;
        serial_driver.write_room = rs_write_room;
        serial_driver.chars_in_buffer = rs_chars_in_buffer;
        serial_driver.flush_buffer = rs_flush_buffer;
        serial_driver.ioctl = rs_ioctl;
        serial_driver.throttle = rs_throttle;
        serial_driver.unthrottle = rs_unthrottle;
        serial_driver.set_termios = rs_set_termios;
        serial_driver.stop = rs_stop;
        serial_driver.start = rs_start;
        serial_driver.hangup = rs_hangup;
#if (LINUX_VERSION_CODE >= 131394) /* Linux 2.1.66 */
        serial_driver.break_ctl = rs_break;
#endif
#if (LINUX_VERSION_CODE >= 131343)
        serial_driver.send_xchar = rs_send_xchar;
        serial_driver.wait_until_sent = rs_wait_until_sent;
        serial_driver.read_proc = rs_read_proc;
#endif
 
        /*
         * The callout device is just like normal device except for
         * major number and the subtype code.
         */
        callout_driver = serial_driver;
#if (LINUX_VERSION_CODE > 0x2032D && defined(CONFIG_DEVFS_FS))
        callout_driver.name = "cua/%d";
#else
        callout_driver.name = "cua";
#endif
        callout_driver.major = TTYAUX_MAJOR;
        callout_driver.subtype = SERIAL_TYPE_CALLOUT;
#if (LINUX_VERSION_CODE >= 131343)
        callout_driver.read_proc = 0;
        callout_driver.proc_entry = 0;
#endif
 
        if (tty_register_driver(&serial_driver))
                panic("Couldn't register serial driver\n");
        if (tty_register_driver(&callout_driver))
                panic("Couldn't register callout driver\n");
 
        for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
                state->magic = SSTATE_MAGIC;
                state->line = i;
                state->type = PORT_UNKNOWN;
                state->custom_divisor = 0;
                state->close_delay = 5*HZ/10;
                state->closing_wait = 30*HZ;
                state->callout_termios = callout_driver.init_termios;
                state->normal_termios = serial_driver.init_termios;
                state->icount.cts = state->icount.dsr =
                        state->icount.rng = state->icount.dcd = 0;
                state->icount.rx = state->icount.tx = 0;
                state->icount.frame = state->icount.parity = 0;
                state->icount.overrun = state->icount.brk = 0;
                state->irq = irq_cannonicalize(state->irq);
                if (state->hub6)
                        state->io_type = SERIAL_IO_HUB6;
                if (state->port && check_region(state->port,8))
                        continue;
#ifdef CONFIG_MCA                       
                if ((state->flags & ASYNC_BOOT_ONLYMCA) && !MCA_bus)
                        continue;
#endif                  
                if (state->flags & ASYNC_BOOT_AUTOCONF)
                        autoconfig(state);
        }
        for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
                if (state->type == PORT_UNKNOWN)
                        continue;
                if (   (state->flags & ASYNC_BOOT_AUTOCONF)
                    && (state->flags & ASYNC_AUTO_IRQ)
                    && (state->port != 0 || state->iomem_base != 0))
                        state->irq = detect_uart_irq(state);
                if (state->io_type == SERIAL_IO_MEM) {
                        printk(KERN_INFO"ttyS%02d%s at 0x%p (irq = %d) is a %s\n",
                               state->line + SERIAL_DEV_OFFSET,
                               (state->flags & ASYNC_FOURPORT) ? " FourPort" : "",
                               state->iomem_base, state->irq,
                               uart_config[state->type].name);
                }
                else {
                        printk(KERN_INFO "ttyS%02d%s at 0x%04lx (irq = %d) is a %s\n",
                               state->line + SERIAL_DEV_OFFSET,
                               (state->flags & ASYNC_FOURPORT) ? " FourPort" : "",
                               state->port, state->irq,
                               uart_config[state->type].name);
                }
                tty_register_devfs(&serial_driver, 0,
                                   serial_driver.minor_start + state->line);
                tty_register_devfs(&callout_driver, 0,
                                   callout_driver.minor_start + state->line);
        }
#ifdef ENABLE_SERIAL_PCI
        probe_serial_pci();
#endif
#ifdef ENABLE_SERIAL_PNP
       probe_serial_pnp();
#endif
        return 0;
}
 
/*
 * This is for use by architectures that know their serial console
 * attributes only at run time. Not to be invoked after rs_init().
 */
int __init early_serial_setup(struct serial_struct *req)
{
        int i = req->line;
 
        if (i >= NR_IRQS)
                return(-ENOENT);
        rs_table[i].magic = 0;
        rs_table[i].baud_base = req->baud_base;
        rs_table[i].port = req->port;
        if (HIGH_BITS_OFFSET)
                rs_table[i].port += (unsigned long) req->port_high <<
                                                        HIGH_BITS_OFFSET;
        rs_table[i].irq = req->irq;
        rs_table[i].flags = req->flags;
        rs_table[i].close_delay = req->close_delay;
        rs_table[i].io_type = req->io_type;
        rs_table[i].hub6 = req->hub6;
        rs_table[i].iomem_base = req->iomem_base;
        rs_table[i].iomem_reg_shift = req->iomem_reg_shift;
        rs_table[i].type = req->type;
        rs_table[i].xmit_fifo_size = req->xmit_fifo_size;
        rs_table[i].custom_divisor = req->custom_divisor;
        rs_table[i].closing_wait = req->closing_wait;
        return(0);
}
 
/*
 * register_serial and unregister_serial allows for 16x50 serial ports to be
 * configured at run-time, to support PCMCIA modems.
 */
 
/**
 *      register_serial - configure a 16x50 serial port at runtime
 *      @req: request structure
 *
 *      Configure the serial port specified by the request. If the
 *      port exists and is in use an error is returned. If the port
 *      is not currently in the table it is added.
 *
 *      The port is then probed and if neccessary the IRQ is autodetected
 *      If this fails an error is returned.
 *
 *      On success the port is ready to use and the line number is returned.
 */
 
int register_serial(struct serial_struct *req)
{
        int i;
        unsigned long flags;
        struct serial_state *state;
        struct async_struct *info;
        unsigned long port;
 
        port = req->port;
        if (HIGH_BITS_OFFSET)
                port += (unsigned long) req->port_high << HIGH_BITS_OFFSET;
 
        save_flags(flags); cli();
        for (i = 0; i < NR_PORTS; i++) {
                if ((rs_table[i].port == port) &&
                    (rs_table[i].iomem_base == req->iomem_base))
                        break;
        }
#ifdef __i386__
        if (i == NR_PORTS) {
                for (i = 4; i < NR_PORTS; i++)
                        if ((rs_table[i].type == PORT_UNKNOWN) &&
                            (rs_table[i].count == 0))
                                break;
        }
#endif
        if (i == NR_PORTS) {
                for (i = 0; i < NR_PORTS; i++)
                        if ((rs_table[i].type == PORT_UNKNOWN) &&
                            (rs_table[i].count == 0))
                                break;
        }
        if (i == NR_PORTS) {
                restore_flags(flags);
                return -1;
        }
        state = &rs_table[i];
        if (rs_table[i].count) {
                restore_flags(flags);
                printk("Couldn't configure serial #%d (port=%ld,irq=%d): "
                       "device already open\n", i, port, req->irq);
                return -1;
        }
        state->irq = req->irq;
        state->port = port;
        state->flags = req->flags;
        state->io_type = req->io_type;
        state->iomem_base = req->iomem_base;
        state->iomem_reg_shift = req->iomem_reg_shift;
        if (req->baud_base)
                state->baud_base = req->baud_base;
        if ((info = state->info) != NULL) {
                info->port = port;
                info->flags = req->flags;
                info->io_type = req->io_type;
                info->iomem_base = req->iomem_base;
                info->iomem_reg_shift = req->iomem_reg_shift;
        }
        autoconfig(state);
        if (state->type == PORT_UNKNOWN) {
                restore_flags(flags);
                printk("register_serial(): autoconfig failed\n");
                return -1;
        }
        restore_flags(flags);
 
        if ((state->flags & ASYNC_AUTO_IRQ) && CONFIGURED_SERIAL_PORT(state))
                state->irq = detect_uart_irq(state);
 
       printk(KERN_INFO "ttyS%02d at %s 0x%04lx (irq = %d) is a %s\n",
              state->line + SERIAL_DEV_OFFSET,
              state->iomem_base ? "iomem" : "port",
              state->iomem_base ? (unsigned long)state->iomem_base :
              state->port, state->irq, uart_config[state->type].name);
        tty_register_devfs(&serial_driver, 0,
                           serial_driver.minor_start + state->line);
        tty_register_devfs(&callout_driver, 0,
                           callout_driver.minor_start + state->line);
        return state->line + SERIAL_DEV_OFFSET;
}
 
/**
 *      unregister_serial - deconfigure a 16x50 serial port
 *      @line: line to deconfigure
 *
 *      The port specified is deconfigured and its resources are freed. Any
 *      user of the port is disconnected as if carrier was dropped. Line is
 *      the port number returned by register_serial().
 */
 
void unregister_serial(int line)
{
        unsigned long flags;
        struct serial_state *state = &rs_table[line];
 
        save_flags(flags); cli();
        if (state->info && state->info->tty)
                tty_hangup(state->info->tty);
        state->type = PORT_UNKNOWN;
        printk(KERN_INFO "ttyS%02d unloaded\n", state->line);
        /* These will be hidden, because they are devices that will no longer
         * be available to the system. (ie, PCMCIA modems, once ejected)
         */
        tty_unregister_devfs(&serial_driver,
                             serial_driver.minor_start + state->line);
        tty_unregister_devfs(&callout_driver,
                             callout_driver.minor_start + state->line);
        restore_flags(flags);
}
 
static void __exit rs_fini(void)
{
        unsigned long flags;
        int e1, e2;
        int i;
        struct async_struct *info;
 
        /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
        del_timer_sync(&serial_timer);
        save_flags(flags); cli();
        remove_bh(SERIAL_BH);
        if ((e1 = tty_unregister_driver(&serial_driver)))
                printk("serial: failed to unregister serial driver (%d)\n",
                       e1);
        if ((e2 = tty_unregister_driver(&callout_driver)))
                printk("serial: failed to unregister callout driver (%d)\n",
                       e2);
        restore_flags(flags);
 
        for (i = 0; i < NR_PORTS; i++) {
                if ((info = rs_table[i].info)) {
                        rs_table[i].info = NULL;
                        kfree(info);
                }
                if ((rs_table[i].type != PORT_UNKNOWN) && rs_table[i].port) {
#ifdef CONFIG_SERIAL_RSA
                        if (rs_table[i].type == PORT_RSA)
                                release_region(rs_table[i].port +
                                               UART_RSA_BASE, 16);
                        else
#endif
                                release_region(rs_table[i].port, 8);
                }
#if defined(ENABLE_SERIAL_PCI) || defined(ENABLE_SERIAL_PNP)
                if (rs_table[i].iomem_base)
                        iounmap(rs_table[i].iomem_base);
#endif
        }
#if defined(ENABLE_SERIAL_PCI) || defined(ENABLE_SERIAL_PNP)
        for (i=0; i < NR_PCI_BOARDS; i++) {
                struct pci_board_inst *brd = &serial_pci_board[i];
 
                if (serial_pci_board[i].dev == 0)
                        continue;
                if (brd->board.init_fn)
                        (brd->board.init_fn)(brd->dev, &brd->board, 0);
                if (DEACTIVATE_FUNC(brd->dev))
                        (DEACTIVATE_FUNC(brd->dev))(brd->dev);
        }
#endif  
        if (tmp_buf) {
                unsigned long pg = (unsigned long) tmp_buf;
                tmp_buf = NULL;
                free_page(pg);
        }
 
#ifdef ENABLE_SERIAL_PCI
        if (serial_pci_driver.name[0])
                pci_unregister_driver (&serial_pci_driver);
#endif
}
 
module_init(rs_init);
module_exit(rs_fini);
MODULE_DESCRIPTION("Standard/generic (dumb) serial driver");
MODULE_AUTHOR("Theodore Ts'o <tytso@mit.edu>");
MODULE_LICENSE("GPL");
 
 
/*
 * ------------------------------------------------------------
 * Serial console driver
 * ------------------------------------------------------------
 */
#ifdef CONFIG_SERIAL_CONSOLE
 
#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
 
static struct async_struct async_sercons;
 
/*
 *      Wait for transmitter & holding register to empty
 */
static inline void wait_for_xmitr(struct async_struct *info)
{
        unsigned int status, tmout = 1000000;
 
        do {
                status = serial_in(info, UART_LSR);
 
                if (status & UART_LSR_BI)
                        lsr_break_flag = UART_LSR_BI;
 
                if (--tmout == 0)
                        break;
        } while((status & BOTH_EMPTY) != BOTH_EMPTY);
 
        /* Wait for flow control if necessary */
        if (info->flags & ASYNC_CONS_FLOW) {
                tmout = 1000000;
                while (--tmout &&
                       ((serial_in(info, UART_MSR) & UART_MSR_CTS) == 0));
        }
}
 
 
/*
 *      Print a string to the serial port trying not to disturb
 *      any possible real use of the port...
 *
 *      The console must be locked when we get here.
 */
static void serial_console_write(struct console *co, const char *s,
                                unsigned count)
{
        static struct async_struct *info = &async_sercons;
        int ier;
        unsigned i;
 
        /*
         *      First save the IER then disable the interrupts
         */
        ier = serial_in(info, UART_IER);
        serial_out(info, UART_IER, 0x00);
 
        /*
         *      Now, do each character
         */
        for (i = 0; i < count; i++, s++) {
                wait_for_xmitr(info);
 
                /*
                 *      Send the character out.
                 *      If a LF, also do CR...
                 */
                serial_out(info, UART_TX, *s);
                if (*s == 10) {
                        wait_for_xmitr(info);
                        serial_out(info, UART_TX, 13);
                }
        }
 
        /*
         *      Finally, Wait for transmitter & holding register to empty
         *      and restore the IER
         */
        wait_for_xmitr(info);
        serial_out(info, UART_IER, ier);
}
 
static kdev_t serial_console_device(struct console *c)
{
        return MKDEV(TTY_MAJOR, 64 + c->index);
}
 
/*
 *      Setup initial baud/bits/parity/flow control. We do two things here:
 *      - construct a cflag setting for the first rs_open()
 *      - initialize the serial port
 *      Return non-zero if we didn't find a serial port.
 */
static int __init serial_console_setup(struct console *co, char *options)
{
        static struct async_struct *info;
        struct serial_state *state;
        unsigned cval;
        int     baud = 9600;
        int     bits = 8;
        int     parity = 'n';
        int     doflow = 0;
        int     cflag = CREAD | HUPCL | CLOCAL;
        int     quot = 0;
        char    *s;
 
        if (options) {
                baud = simple_strtoul(options, NULL, 10);
                s = options;
                while(*s >= '0' && *s <= '9')
                        s++;
                if (*s) parity = *s++;
                if (*s) bits   = *s++ - '0';
                if (*s) doflow = (*s++ == 'r');
        }
 
        /*
         *      Now construct a cflag setting.
         */
        switch(baud) {
                case 1200:
                        cflag |= B1200;
                        break;
                case 2400:
                        cflag |= B2400;
                        break;
                case 4800:
                        cflag |= B4800;
                        break;
                case 19200:
                        cflag |= B19200;
                        break;
                case 38400:
                        cflag |= B38400;
                        break;
                case 57600:
                        cflag |= B57600;
                        break;
                case 115200:
                        cflag |= B115200;
                        break;
                case 9600:
                default:
                        cflag |= B9600;
                        /*
                         * Set this to a sane value to prevent a divide error
                         */
                        baud  = 9600;
                        break;
        }
        switch(bits) {
                case 7:
                        cflag |= CS7;
                        break;
                default:
                case 8:
                        cflag |= CS8;
                        break;
        }
        switch(parity) {
                case 'o': case 'O':
                        cflag |= PARODD;
                        break;
                case 'e': case 'E':
                        cflag |= PARENB;
                        break;
        }
        co->cflag = cflag;
 
        /*
         *      Divisor, bytesize and parity
         */
        state = rs_table + co->index;
        if (doflow)
                state->flags |= ASYNC_CONS_FLOW;
        info = &async_sercons;
        info->magic = SERIAL_MAGIC;
        info->state = state;
        info->port = state->port;
        info->flags = state->flags;
#ifdef CONFIG_HUB6
        info->hub6 = state->hub6;
#endif
        info->io_type = state->io_type;
        info->iomem_base = state->iomem_base;
        info->iomem_reg_shift = state->iomem_reg_shift;
        quot = state->baud_base / baud;
        cval = cflag & (CSIZE | CSTOPB);
#if defined(__powerpc__) || defined(__alpha__)
        cval >>= 8;
#else /* !__powerpc__ && !__alpha__ */
        cval >>= 4;
#endif /* !__powerpc__ && !__alpha__ */
        if (cflag & PARENB)
                cval |= UART_LCR_PARITY;
        if (!(cflag & PARODD))
                cval |= UART_LCR_EPAR;
 
        /*
         *      Disable UART interrupts, set DTR and RTS high
         *      and set speed.
         */
        serial_out(info, UART_LCR, cval | UART_LCR_DLAB);       /* set DLAB */
        serial_out(info, UART_DLL, quot & 0xff);        /* LS of divisor */
        serial_out(info, UART_DLM, quot >> 8);          /* MS of divisor */
        serial_out(info, UART_LCR, cval);               /* reset DLAB */
        serial_out(info, UART_IER, 0);
        serial_out(info, UART_MCR, UART_MCR_DTR | UART_MCR_RTS);
 
        /*
         *      If we read 0xff from the LSR, there is no UART here.
         */
        if (serial_in(info, UART_LSR) == 0xff)
                return -1;
 
        return 0;
}
 
static struct console sercons = {
        name:           "ttyS",
        write:          serial_console_write,
        device:         serial_console_device,
        setup:          serial_console_setup,
        flags:          CON_PRINTBUFFER,
        index:          -1,
};
 
/*
 *      Register console.
 */
void __init serial_console_init(void)
{
        register_console(&sercons);
}
#endif
 
/*
  Local variables:
  compile-command: "gcc -D__KERNEL__ -I../../include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -fno-strict-aliasing -pipe -fno-strength-reduce -march=i586 -DMODULE -DMODVERSIONS -include ../../include/linux/modversions.h   -DEXPORT_SYMTAB -c serial.c"
  End:
*/
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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [char/] [serial.c] - Blame information for rev 1774

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* linux/drivers/char/serial.c`
3			`*`
4			`* Copyright (C) 1991, 1992 Linus Torvalds`
5			`* Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,`
6			`* 1998, 1999 Theodore Ts'o`
7			`*`
8			`* Extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92. Now`
9			`* much more extensible to support other serial cards based on the`
10			`* 16450/16550A UART's. Added support for the AST FourPort and the`
11			`* Accent Async board.`
12			`*`
13			`* set_serial_info fixed to set the flags, custom divisor, and uart`
14			`* type fields. Fix suggested by Michael K. Johnson 12/12/92.`
15			`*`
16			`* 11/95: TIOCMIWAIT, TIOCGICOUNT by Angelo Haritsis <ah@doc.ic.ac.uk>`
17			`*`
18			`* 03/96: Modularised by Angelo Haritsis <ah@doc.ic.ac.uk>`
19			`*`
20			`* rs_set_termios fixed to look also for changes of the input`
21			`* flags INPCK, BRKINT, PARMRK, IGNPAR and IGNBRK.`
22			`* Bernd Anh�upl 05/17/96.`
23			`*`
24			`* 1/97: Extended dumb serial ports are a config option now.`
25			`* Saves 4k. Michael A. Griffith <grif@acm.org>`
26			`*`
27			`* 8/97: Fix bug in rs_set_termios with RTS`
28			`* Stanislav V. Voronyi <stas@uanet.kharkov.ua>`
29			`*`
30			`* 3/98: Change the IRQ detection, use of probe_irq_o*(),`
31			`* suppress TIOCSERGWILD and TIOCSERSWILD`
32			`* Etienne Lorrain <etienne.lorrain@ibm.net>`
33			`*`
34			`* 4/98: Added changes to support the ARM architecture proposed by`
35			`* Russell King`
36			`*`
37			`* 5/99: Updated to include support for the XR16C850 and ST16C654`
38			`* uarts. Stuart MacDonald <stuartm@connecttech.com>`
39			`*`
40			`* 8/99: Generalized PCI support added. Theodore Ts'o`