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mxser_new.c

/*
 *          mxser.c  -- MOXA Smartio/Industio family multiport serial driver.
 *
 *      Copyright (C) 1999-2006  Moxa Technologies (support@moxa.com.tw).
 *    Copyright (C) 2006-2007  Jiri Slaby <jirislaby@gmail.com>
 *
 *      This code is loosely based on the 1.8 moxa driver which is based on
 *    Linux serial driver, written by Linus Torvalds, Theodore T'so and
 *    others.
 *
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *      (at your option) any later version.
 *
 *    Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
 *    <alan@redhat.com>. The original 1.8 code is available on www.moxa.com.
 *    - Fixed x86_64 cleanness
 *    - Fixed sleep with spinlock held in mxser_send_break
 */

#include <linux/module.h>
#include <linux/autoconf.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/serial_reg.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/gfp.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/bitops.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>

#include "mxser_new.h"

#define     MXSER_VERSION     "2.0.2"           /* 1.10 */
#define     MXSERMAJOR   174
#define     MXSERCUMAJOR       175

#define MXSER_BOARDS          4     /* Max. boards */
#define MXSER_PORTS_PER_BOARD 8     /* Max. ports per board */
#define MXSER_PORTS           (MXSER_BOARDS * MXSER_PORTS_PER_BOARD)
#define MXSER_ISR_PASS_LIMIT  100

#define     MXSER_ERR_IOADDR  -1
#define     MXSER_ERR_IRQ           -2
#define     MXSER_ERR_IRQ_CONFLIT   -3
#define     MXSER_ERR_VECTOR  -4

/*CheckIsMoxaMust return value*/
#define MOXA_OTHER_UART       0x00
#define MOXA_MUST_MU150_HWID  0x01
#define MOXA_MUST_MU860_HWID  0x02

#define WAKEUP_CHARS          256

#define UART_MCR_AFE          0x20
#define UART_LSR_SPECIAL      0x1E

#define PCI_DEVICE_ID_CB108   0x1080
#define PCI_DEVICE_ID_CB114   0x1142
#define PCI_DEVICE_ID_CB134I  0x1341
#define PCI_DEVICE_ID_CP138U  0x1380
#define PCI_DEVICE_ID_POS104UL      0x1044


#define C168_ASIC_ID    1
#define C104_ASIC_ID    2
#define C102_ASIC_ID    0xB
#define CI132_ASIC_ID   4
#define CI134_ASIC_ID   3
#define CI104J_ASIC_ID  5

#define MXSER_HIGHBAUD  1
#define MXSER_HAS2      2

/* This is only for PCI */
static const struct {
      int type;
      int tx_fifo;
      int rx_fifo;
      int xmit_fifo_size;
      int rx_high_water;
      int rx_trigger;
      int rx_low_water;
      long max_baud;
} Gpci_uart_info[] = {
      {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
      {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
      {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
};
#define UART_INFO_NUM   ARRAY_SIZE(Gpci_uart_info)

struct mxser_cardinfo {
      unsigned int nports;
      char *name;
      unsigned int flags;
};

static const struct mxser_cardinfo mxser_cards[] = {
/* 0*/      { 8, "C168 series", },
      { 4, "C104 series", },
      { 4, "CI-104J series", },
      { 8, "C168H/PCI series", },
      { 4, "C104H/PCI series", },
/* 5*/      { 4, "C102 series", MXSER_HAS2 },   /* C102-ISA */
      { 4, "CI-132 series", MXSER_HAS2 },
      { 4, "CI-134 series", },
      { 2, "CP-132 series", },
      { 4, "CP-114 series", },
/*10*/      { 4, "CT-114 series", },
      { 2, "CP-102 series", MXSER_HIGHBAUD },
      { 4, "CP-104U series", },
      { 8, "CP-168U series", },
      { 2, "CP-132U series", },
/*15*/      { 4, "CP-134U series", },
      { 4, "CP-104JU series", },
      { 8, "Moxa UC7000 Serial", },       /* RC7000 */
      { 8, "CP-118U series", },
      { 2, "CP-102UL series", },
/*20*/      { 2, "CP-102U series", },
      { 8, "CP-118EL series", },
      { 8, "CP-168EL series", },
      { 4, "CP-104EL series", },
      { 8, "CB-108 series", },
/*25*/      { 4, "CB-114 series", },
      { 4, "CB-134I series", },
      { 8, "CP-138U series", },
      { 4, "POS-104UL series", }
};

/* driver_data correspond to the lines in the structure above
   see also ISA probe function before you change something */
static struct pci_device_id mxser_pcibrds[] = {
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168),   .driver_data = 3 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104),   .driver_data = 4 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132),  .driver_data = 8 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114),  .driver_data = 9 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114),  .driver_data = 10 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102),  .driver_data = 11 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U), .driver_data = 12 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U), .driver_data = 13 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U), .driver_data = 14 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U), .driver_data = 15 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 16 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000), .driver_data = 17 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U), .driver_data = 18 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 19 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U), .driver_data = 20 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 21 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 22 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 23 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108), .driver_data = 24 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114), .driver_data = 25 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I),      .driver_data = 26 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U),      .driver_data = 27 },
      { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL),    .driver_data = 28 },
      { }
};
MODULE_DEVICE_TABLE(pci, mxser_pcibrds);

static int mxvar_baud_table[] = {
      0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400,
      4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600
};
static unsigned int mxvar_baud_table1[] = {
      0, B50, B75, B110, B134, B150, B200, B300, B600, B1200, B1800, B2400,
      B4800, B9600, B19200, B38400, B57600, B115200, B230400, B460800, B921600
};
#define BAUD_TABLE_NO ARRAY_SIZE(mxvar_baud_table)

#define B_SPEC    B2000000

static int ioaddr[MXSER_BOARDS] = { 0, 0, 0, 0 };
static int ttymajor = MXSERMAJOR;
static int calloutmajor = MXSERCUMAJOR;

/* Variables for insmod */

MODULE_AUTHOR("Casper Yang");
MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
module_param_array(ioaddr, int, NULL, 0);
module_param(ttymajor, int, 0);
MODULE_LICENSE("GPL");

struct mxser_log {
      int tick;
      unsigned long rxcnt[MXSER_PORTS];
      unsigned long txcnt[MXSER_PORTS];
};


struct mxser_mon {
      unsigned long rxcnt;
      unsigned long txcnt;
      unsigned long up_rxcnt;
      unsigned long up_txcnt;
      int modem_status;
      unsigned char hold_reason;
};

struct mxser_mon_ext {
      unsigned long rx_cnt[32];
      unsigned long tx_cnt[32];
      unsigned long up_rxcnt[32];
      unsigned long up_txcnt[32];
      int modem_status[32];

      long baudrate[32];
      int databits[32];
      int stopbits[32];
      int parity[32];
      int flowctrl[32];
      int fifo[32];
      int iftype[32];
};

struct mxser_board;

struct mxser_port {
      struct mxser_board *board;
      struct tty_struct *tty;

      unsigned long ioaddr;
      unsigned long opmode_ioaddr;
      int max_baud;

      int rx_high_water;
      int rx_trigger;         /* Rx fifo trigger level */
      int rx_low_water;
      int baud_base;          /* max. speed */
      long realbaud;
      int type;         /* UART type */
      int flags;        /* defined in tty.h */
      int speed;

      int x_char;       /* xon/xoff character */
      int IER;          /* Interrupt Enable Register */
      int MCR;          /* Modem control register */

      unsigned char stop_rx;
      unsigned char ldisc_stop_rx;

      int custom_divisor;
      int close_delay;
      unsigned short closing_wait;
      unsigned char err_shadow;
      unsigned long event;

      int count;        /* # of fd on device */
      int blocked_open; /* # of blocked opens */
      struct async_icount icount; /* kernel counters for 4 input interrupts */
      int timeout;

      int read_status_mask;
      int ignore_status_mask;
      int xmit_fifo_size;
      unsigned char *xmit_buf;
      int xmit_head;
      int xmit_tail;
      int xmit_cnt;

      struct ktermios normal_termios;

      struct mxser_mon mon_data;

      spinlock_t slock;
      wait_queue_head_t open_wait;
      wait_queue_head_t delta_msr_wait;
};

struct mxser_board {
      unsigned int idx;
      int irq;
      const struct mxser_cardinfo *info;
      unsigned long vector;
      unsigned long vector_mask;

      int chip_flag;
      int uart_type;

      struct mxser_port ports[MXSER_PORTS_PER_BOARD];
};

struct mxser_mstatus {
      tcflag_t cflag;
      int cts;
      int dsr;
      int ri;
      int dcd;
};

static struct mxser_mstatus GMStatus[MXSER_PORTS];

static int mxserBoardCAP[MXSER_BOARDS] = {
      0, 0, 0, 0
      /*  0x180, 0x280, 0x200, 0x320 */
};

static struct mxser_board mxser_boards[MXSER_BOARDS];
static struct tty_driver *mxvar_sdriver;
static struct mxser_log mxvar_log;
static int mxvar_diagflag;
static unsigned char mxser_msr[MXSER_PORTS + 1];
static struct mxser_mon_ext mon_data_ext;
static int mxser_set_baud_method[MXSER_PORTS + 1];

#ifdef CONFIG_PCI
static int __devinit CheckIsMoxaMust(int io)
{
      u8 oldmcr, hwid;
      int i;

      outb(0, io + UART_LCR);
      DISABLE_MOXA_MUST_ENCHANCE_MODE(io);
      oldmcr = inb(io + UART_MCR);
      outb(0, io + UART_MCR);
      SET_MOXA_MUST_XON1_VALUE(io, 0x11);
      if ((hwid = inb(io + UART_MCR)) != 0) {
            outb(oldmcr, io + UART_MCR);
            return MOXA_OTHER_UART;
      }

      GET_MOXA_MUST_HARDWARE_ID(io, &hwid);
      for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
            if (hwid == Gpci_uart_info[i].type)
                  return (int)hwid;
      }
      return MOXA_OTHER_UART;
}
#endif

static void process_txrx_fifo(struct mxser_port *info)
{
      int i;

      if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
            info->rx_trigger = 1;
            info->rx_high_water = 1;
            info->rx_low_water = 1;
            info->xmit_fifo_size = 1;
      } else
            for (i = 0; i < UART_INFO_NUM; i++)
                  if (info->board->chip_flag == Gpci_uart_info[i].type) {
                        info->rx_trigger = Gpci_uart_info[i].rx_trigger;
                        info->rx_low_water = Gpci_uart_info[i].rx_low_water;
                        info->rx_high_water = Gpci_uart_info[i].rx_high_water;
                        info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
                        break;
                  }
}

static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
{
      unsigned char status = 0;

      status = inb(baseaddr + UART_MSR);

      mxser_msr[port] &= 0x0F;
      mxser_msr[port] |= status;
      status = mxser_msr[port];
      if (mode)
            mxser_msr[port] = 0;

      return status;
}

static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
            struct mxser_port *port)
{
      DECLARE_WAITQUEUE(wait, current);
      int retval;
      int do_clocal = 0;
      unsigned long flags;

      /*
       * 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) ||
                  test_bit(TTY_IO_ERROR, &tty->flags)) {
            port->flags |= ASYNC_NORMAL_ACTIVE;
            return 0;
      }

      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, port->count is dropped by one, so that
       * mxser_close() knows when to free things.  We restore it upon
       * exit, either normal or abnormal.
       */
      retval = 0;
      add_wait_queue(&port->open_wait, &wait);

      spin_lock_irqsave(&port->slock, flags);
      if (!tty_hung_up_p(filp))
            port->count--;
      spin_unlock_irqrestore(&port->slock, flags);
      port->blocked_open++;
      while (1) {
            spin_lock_irqsave(&port->slock, flags);
            outb(inb(port->ioaddr + UART_MCR) |
                  UART_MCR_DTR | UART_MCR_RTS, port->ioaddr + UART_MCR);
            spin_unlock_irqrestore(&port->slock, flags);
            set_current_state(TASK_INTERRUPTIBLE);
            if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) {
                  if (port->flags & ASYNC_HUP_NOTIFY)
                        retval = -EAGAIN;
                  else
                        retval = -ERESTARTSYS;
                  break;
            }
            if (!(port->flags & ASYNC_CLOSING) &&
                        (do_clocal ||
                        (inb(port->ioaddr + UART_MSR) & UART_MSR_DCD)))
                  break;
            if (signal_pending(current)) {
                  retval = -ERESTARTSYS;
                  break;
            }
            schedule();
      }
      set_current_state(TASK_RUNNING);
      remove_wait_queue(&port->open_wait, &wait);
      if (!tty_hung_up_p(filp))
            port->count++;
      port->blocked_open--;
      if (retval)
            return retval;
      port->flags |= ASYNC_NORMAL_ACTIVE;
      return 0;
}

static int mxser_set_baud(struct mxser_port *info, long newspd)
{
      unsigned int i;
      int quot = 0;
      unsigned char cval;
      int ret = 0;

      if (!info->tty || !info->tty->termios)
            return ret;

      if (!(info->ioaddr))
            return ret;

      if (newspd > info->max_baud)
            return 0;

      info->realbaud = newspd;
      for (i = 0; i < BAUD_TABLE_NO; i++)
             if (newspd == mxvar_baud_table[i])
                   break;
      if (i == BAUD_TABLE_NO) {
            quot = info->baud_base / info->speed;
            if (info->speed <= 0 || info->speed > info->max_baud)
                  quot = 0;
      } else {
            if (newspd == 134) {
                  quot = (2 * info->baud_base / 269);
            } else if (newspd) {
                  quot = info->baud_base / newspd;
                  if (quot == 0)
                        quot = 1;
            } else {
                  quot = 0;
            }
      }

      info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
      info->timeout += HZ / 50;     /* Add .02 seconds of slop */

      if (quot) {
            info->MCR |= UART_MCR_DTR;
            outb(info->MCR, info->ioaddr + UART_MCR);
      } else {
            info->MCR &= ~UART_MCR_DTR;
            outb(info->MCR, info->ioaddr + UART_MCR);
            return ret;
      }

      cval = inb(info->ioaddr + UART_LCR);

      outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);  /* set DLAB */

      outb(quot & 0xff, info->ioaddr + UART_DLL);     /* LS of divisor */
      outb(quot >> 8, info->ioaddr + UART_DLM); /* MS of divisor */
      outb(cval, info->ioaddr + UART_LCR);      /* reset DLAB */

      if (i == BAUD_TABLE_NO) {
            quot = info->baud_base % info->speed;
            quot *= 8;
            if ((quot % info->speed) > (info->speed / 2)) {
                  quot /= info->speed;
                  quot++;
            } else {
                  quot /= info->speed;
            }
            SET_MOXA_MUST_ENUM_VALUE(info->ioaddr, quot);
      } else
            SET_MOXA_MUST_ENUM_VALUE(info->ioaddr, 0);

      return ret;
}

/*
 * This routine is called to set the UART divisor registers to match
 * the specified baud rate for a serial port.
 */
static int mxser_change_speed(struct mxser_port *info,
            struct ktermios *old_termios)
{
      unsigned cflag, cval, fcr;
      int ret = 0;
      unsigned char status;
      long baud;

      if (!info->tty || !info->tty->termios)
            return ret;
      cflag = info->tty->termios->c_cflag;
      if (!(info->ioaddr))
            return ret;

      if (mxser_set_baud_method[info->tty->index] == 0) {
            if ((cflag & CBAUD) == B_SPEC)
                  baud = info->speed;
            else
                  baud = tty_get_baud_rate(info->tty);
            mxser_set_baud(info, baud);
      }

      /* byte size and parity */
      switch (cflag & CSIZE) {
      case CS5:
            cval = 0x00;
            break;
      case CS6:
            cval = 0x01;
            break;
      case CS7:
            cval = 0x02;
            break;
      case CS8:
            cval = 0x03;
            break;
      default:
            cval = 0x00;
            break;            /* too keep GCC shut... */
      }
      if (cflag & CSTOPB)
            cval |= 0x04;
      if (cflag & PARENB)
            cval |= UART_LCR_PARITY;
      if (!(cflag & PARODD))
            cval |= UART_LCR_EPAR;
      if (cflag & CMSPAR)
            cval |= UART_LCR_SPAR;

      if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
            if (info->board->chip_flag) {
                  fcr = UART_FCR_ENABLE_FIFO;
                  fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
                  SET_MOXA_MUST_FIFO_VALUE(info);
            } else
                  fcr = 0;
      } else {
            fcr = UART_FCR_ENABLE_FIFO;
            if (info->board->chip_flag) {
                  fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
                  SET_MOXA_MUST_FIFO_VALUE(info);
            } else {
                  switch (info->rx_trigger) {
                  case 1:
                        fcr |= UART_FCR_TRIGGER_1;
                        break;
                  case 4:
                        fcr |= UART_FCR_TRIGGER_4;
                        break;
                  case 8:
                        fcr |= UART_FCR_TRIGGER_8;
                        break;
                  default:
                        fcr |= UART_FCR_TRIGGER_14;
                        break;
                  }
            }
      }

      /* CTS flow control flag and modem status interrupts */
      info->IER &= ~UART_IER_MSI;
      info->MCR &= ~UART_MCR_AFE;
      if (cflag & CRTSCTS) {
            info->flags |= ASYNC_CTS_FLOW;
            info->IER |= UART_IER_MSI;
            if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
                  info->MCR |= UART_MCR_AFE;
            } else {
                  status = inb(info->ioaddr + UART_MSR);
                  if (info->tty->hw_stopped) {
                        if (status & UART_MSR_CTS) {
                              info->tty->hw_stopped = 0;
                              if (info->type != PORT_16550A &&
                                          !info->board->chip_flag) {
                                    outb(info->IER & ~UART_IER_THRI,
                                          info->ioaddr +
                                          UART_IER);
                                    info->IER |= UART_IER_THRI;
                                    outb(info->IER, info->ioaddr +
                                                UART_IER);
                              }
                              tty_wakeup(info->tty);
                        }
                  } else {
                        if (!(status & UART_MSR_CTS)) {
                              info->tty->hw_stopped = 1;
                              if ((info->type != PORT_16550A) &&
                                          (!info->board->chip_flag)) {
                                    info->IER &= ~UART_IER_THRI;
                                    outb(info->IER, info->ioaddr +
                                                UART_IER);
                              }
                        }
                  }
            }
      } else {
            info->flags &= ~ASYNC_CTS_FLOW;
      }
      outb(info->MCR, info->ioaddr + UART_MCR);
      if (cflag & CLOCAL) {
            info->flags &= ~ASYNC_CHECK_CD;
      } else {
            info->flags |= ASYNC_CHECK_CD;
            info->IER |= UART_IER_MSI;
      }
      outb(info->IER, info->ioaddr + UART_IER);

      /*
       * Set up parity check flag
       */
      info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
      if (I_INPCK(info->tty))
            info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
      if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
            info->read_status_mask |= UART_LSR_BI;

      info->ignore_status_mask = 0;

      if (I_IGNBRK(info->tty)) {
            info->ignore_status_mask |= UART_LSR_BI;
            info->read_status_mask |= UART_LSR_BI;
            /*
             * If we're ignore parity and break indicators, ignore
             * overruns too.  (For real raw support).
             */
            if (I_IGNPAR(info->tty)) {
                  info->ignore_status_mask |=
                                    UART_LSR_OE |
                                    UART_LSR_PE |
                                    UART_LSR_FE;
                  info->read_status_mask |=
                                    UART_LSR_OE |
                                    UART_LSR_PE |
                                    UART_LSR_FE;
            }
      }
      if (info->board->chip_flag) {
            SET_MOXA_MUST_XON1_VALUE(info->ioaddr, START_CHAR(info->tty));
            SET_MOXA_MUST_XOFF1_VALUE(info->ioaddr, STOP_CHAR(info->tty));
            if (I_IXON(info->tty)) {
                  ENABLE_MOXA_MUST_RX_SOFTWARE_FLOW_CONTROL(info->ioaddr);
            } else {
                  DISABLE_MOXA_MUST_RX_SOFTWARE_FLOW_CONTROL(info->ioaddr);
            }
            if (I_IXOFF(info->tty)) {
                  ENABLE_MOXA_MUST_TX_SOFTWARE_FLOW_CONTROL(info->ioaddr);
            } else {
                  DISABLE_MOXA_MUST_TX_SOFTWARE_FLOW_CONTROL(info->ioaddr);
            }
      }


      outb(fcr, info->ioaddr + UART_FCR); /* set fcr */
      outb(cval, info->ioaddr + UART_LCR);

      return ret;
}

static void mxser_check_modem_status(struct mxser_port *port, int status)
{
      /* update input line counters */
      if (status & UART_MSR_TERI)
            port->icount.rng++;
      if (status & UART_MSR_DDSR)
            port->icount.dsr++;
      if (status & UART_MSR_DDCD)
            port->icount.dcd++;
      if (status & UART_MSR_DCTS)
            port->icount.cts++;
      port->mon_data.modem_status = status;
      wake_up_interruptible(&port->delta_msr_wait);

      if ((port->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
            if (status & UART_MSR_DCD)
                  wake_up_interruptible(&port->open_wait);
      }

      if (port->flags & ASYNC_CTS_FLOW) {
            if (port->tty->hw_stopped) {
                  if (status & UART_MSR_CTS) {
                        port->tty->hw_stopped = 0;

                        if ((port->type != PORT_16550A) &&
                                    (!port->board->chip_flag)) {
                              outb(port->IER & ~UART_IER_THRI,
                                    port->ioaddr + UART_IER);
                              port->IER |= UART_IER_THRI;
                              outb(port->IER, port->ioaddr +
                                          UART_IER);
                        }
                        tty_wakeup(port->tty);
                  }
            } else {
                  if (!(status & UART_MSR_CTS)) {
                        port->tty->hw_stopped = 1;
                        if (port->type != PORT_16550A &&
                                    !port->board->chip_flag) {
                              port->IER &= ~UART_IER_THRI;
                              outb(port->IER, port->ioaddr +
                                          UART_IER);
                        }
                  }
            }
      }
}

static int mxser_startup(struct mxser_port *info)
{
      unsigned long page;
      unsigned long flags;

      page = __get_free_page(GFP_KERNEL);
      if (!page)
            return -ENOMEM;

      spin_lock_irqsave(&info->slock, flags);

      if (info->flags & ASYNC_INITIALIZED) {
            free_page(page);
            spin_unlock_irqrestore(&info->slock, flags);
            return 0;
      }

      if (!info->ioaddr || !info->type) {
            if (info->tty)
                  set_bit(TTY_IO_ERROR, &info->tty->flags);
            free_page(page);
            spin_unlock_irqrestore(&info->slock, flags);
            return 0;
      }
      if (info->xmit_buf)
            free_page(page);
      else
            info->xmit_buf = (unsigned char *) page;

      /*
       * Clear the FIFO buffers and disable them
       * (they will be reenabled in mxser_change_speed())
       */
      if (info->board->chip_flag)
            outb((UART_FCR_CLEAR_RCVR |
                  UART_FCR_CLEAR_XMIT |
                  MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
      else
            outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
                  info->ioaddr + UART_FCR);

      /*
       * 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 (inb(info->ioaddr + UART_LSR) == 0xff) {
            spin_unlock_irqrestore(&info->slock, flags);
            if (capable(CAP_SYS_ADMIN)) {
                  if (info->tty)
                        set_bit(TTY_IO_ERROR, &info->tty->flags);
                  return 0;
            } else
                  return -ENODEV;
      }

      /*
       * Clear the interrupt registers.
       */
      (void) inb(info->ioaddr + UART_LSR);
      (void) inb(info->ioaddr + UART_RX);
      (void) inb(info->ioaddr + UART_IIR);
      (void) inb(info->ioaddr + UART_MSR);

      /*
       * Now, initialize the UART
       */
      outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
      info->MCR = UART_MCR_DTR | UART_MCR_RTS;
      outb(info->MCR, info->ioaddr + UART_MCR);

      /*
       * Finally, enable interrupts
       */
      info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;

      if (info->board->chip_flag)
            info->IER |= MOXA_MUST_IER_EGDAI;
      outb(info->IER, info->ioaddr + UART_IER); /* enable interrupts */

      /*
       * And clear the interrupt registers again for luck.
       */
      (void) inb(info->ioaddr + UART_LSR);
      (void) inb(info->ioaddr + UART_RX);
      (void) inb(info->ioaddr + UART_IIR);
      (void) inb(info->ioaddr + UART_MSR);

      if (info->tty)
            clear_bit(TTY_IO_ERROR, &info->tty->flags);
      info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;

      /*
       * and set the speed of the serial port
       */
      mxser_change_speed(info, NULL);
      info->flags |= ASYNC_INITIALIZED;
      spin_unlock_irqrestore(&info->slock, flags);

      return 0;
}

/*
 * This routine will shutdown a serial port; interrupts maybe disabled, and
 * DTR is dropped if the hangup on close termio flag is on.
 */
static void mxser_shutdown(struct mxser_port *info)
{
      unsigned long flags;

      if (!(info->flags & ASYNC_INITIALIZED))
            return;

      spin_lock_irqsave(&info->slock, flags);

      /*
       * 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);

      /*
       * Free the IRQ, if necessary
       */
      if (info->xmit_buf) {
            free_page((unsigned long) info->xmit_buf);
            info->xmit_buf = NULL;
      }

      info->IER = 0;
      outb(0x00, info->ioaddr + UART_IER);

      if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
            info->MCR &= ~(UART_MCR_DTR | UART_MCR_RTS);
      outb(info->MCR, info->ioaddr + UART_MCR);

      /* clear Rx/Tx FIFO's */
      if (info->board->chip_flag)
            outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
                        MOXA_MUST_FCR_GDA_MODE_ENABLE,
                        info->ioaddr + UART_FCR);
      else
            outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
                  info->ioaddr + UART_FCR);

      /* read data port to reset things */
      (void) inb(info->ioaddr + UART_RX);

      if (info->tty)
            set_bit(TTY_IO_ERROR, &info->tty->flags);

      info->flags &= ~ASYNC_INITIALIZED;

      if (info->board->chip_flag)
            SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);

      spin_unlock_irqrestore(&info->slock, flags);
}

/*
 * This routine is called whenever a serial port is opened.  It
 * enables interrupts for a serial port, linking in its async structure into
 * the IRQ chain.   It also performs the serial-specific
 * initialization for the tty structure.
 */
static int mxser_open(struct tty_struct *tty, struct file *filp)
{
      struct mxser_port *info;
      unsigned long flags;
      int retval, line;

      line = tty->index;
      if (line == MXSER_PORTS)
            return 0;
      if (line < 0 || line > MXSER_PORTS)
            return -ENODEV;
      info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
      if (!info->ioaddr)
            return -ENODEV;

      tty->driver_data = info;
      info->tty = tty;
      /*
       * Start up serial port
       */
      spin_lock_irqsave(&info->slock, flags);
      info->count++;
      spin_unlock_irqrestore(&info->slock, flags);
      retval = mxser_startup(info);
      if (retval)
            return retval;

      retval = mxser_block_til_ready(tty, filp, info);
      if (retval)
            return retval;

      /* unmark here for very high baud rate (ex. 921600 bps) used */
      tty->low_latency = 1;
      return 0;
}

/*
 * 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 mxser_close(struct tty_struct *tty, struct file *filp)
{
      struct mxser_port *info = tty->driver_data;

      unsigned long timeout;
      unsigned long flags;

      if (tty->index == MXSER_PORTS)
            return;
      if (!info)
            return;

      spin_lock_irqsave(&info->slock, flags);

      if (tty_hung_up_p(filp)) {
            spin_unlock_irqrestore(&info->slock, flags);
            return;
      }
      if ((tty->count == 1) && (info->count != 1)) {
            /*
             * Uh, oh.  tty->count is 1, which means that the tty
             * structure will be freed.  Info->count should always
             * be one in these conditions.  If it's greater than
             * one, we've got real problems, since it means the
             * serial port won't be shutdown.
             */
            printk(KERN_ERR "mxser_close: bad serial port count; "
                  "tty->count is 1, info->count is %d\n", info->count);
            info->count = 1;
      }
      if (--info->count < 0) {
            printk(KERN_ERR "mxser_close: bad serial port count for "
                  "ttys%d: %d\n", tty->index, info->count);
            info->count = 0;
      }
      if (info->count) {
            spin_unlock_irqrestore(&info->slock, flags);
            return;
      }
      info->flags |= ASYNC_CLOSING;
      spin_unlock_irqrestore(&info->slock, flags);
      /*
       * Save the termios structure, since this port may have
       * separate termios for callout and dialin.
       */
      if (info->flags & ASYNC_NORMAL_ACTIVE)
            info->normal_termios = *tty->termios;
      /*
       * 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;
      if (info->board->chip_flag)
            info->IER &= ~MOXA_MUST_RECV_ISR;

      if (info->flags & ASYNC_INITIALIZED) {
            outb(info->IER, info->ioaddr + UART_IER);
            /*
             * Before we drop DTR, make sure the UART transmitter
             * has completely drained; this is especially
             * important if there is a transmit FIFO!
             */
            timeout = jiffies + HZ;
            while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
                  schedule_timeout_interruptible(5);
                  if (time_after(jiffies, timeout))
                        break;
            }
      }
      mxser_shutdown(info);

      if (tty->driver->flush_buffer)
            tty->driver->flush_buffer(tty);

      tty_ldisc_flush(tty);

      tty->closing = 0;
      info->event = 0;
      info->tty = NULL;
      if (info->blocked_open) {
            if (info->close_delay)
                  schedule_timeout_interruptible(info->close_delay);
            wake_up_interruptible(&info->open_wait);
      }

      info->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
}

static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
      int c, total = 0;
      struct mxser_port *info = tty->driver_data;
      unsigned long flags;

      if (!info->xmit_buf)
            return 0;

      while (1) {
            c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
                                SERIAL_XMIT_SIZE - info->xmit_head));
            if (c <= 0)
                  break;

            memcpy(info->xmit_buf + info->xmit_head, buf, c);
            spin_lock_irqsave(&info->slock, flags);
            info->xmit_head = (info->xmit_head + c) &
                          (SERIAL_XMIT_SIZE - 1);
            info->xmit_cnt += c;
            spin_unlock_irqrestore(&info->slock, flags);

            buf += c;
            count -= c;
            total += c;
      }

      if (info->xmit_cnt && !tty->stopped) {
            if (!tty->hw_stopped ||
                        (info->type == PORT_16550A) ||
                        (info->board->chip_flag)) {
                  spin_lock_irqsave(&info->slock, flags);
                  outb(info->IER & ~UART_IER_THRI, info->ioaddr +
                              UART_IER);
                  info->IER |= UART_IER_THRI;
                  outb(info->IER, info->ioaddr + UART_IER);
                  spin_unlock_irqrestore(&info->slock, flags);
            }
      }
      return total;
}

static void mxser_put_char(struct tty_struct *tty, unsigned char ch)
{
      struct mxser_port *info = tty->driver_data;
      unsigned long flags;

      if (!info->xmit_buf)
            return;

      if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
            return;

      spin_lock_irqsave(&info->slock, flags);
      info->xmit_buf[info->xmit_head++] = ch;
      info->xmit_head &= SERIAL_XMIT_SIZE - 1;
      info->xmit_cnt++;
      spin_unlock_irqrestore(&info->slock, flags);
      if (!tty->stopped) {
            if (!tty->hw_stopped ||
                        (info->type == PORT_16550A) ||
                        info->board->chip_flag) {
                  spin_lock_irqsave(&info->slock, flags);
                  outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
                  info->IER |= UART_IER_THRI;
                  outb(info->IER, info->ioaddr + UART_IER);
                  spin_unlock_irqrestore(&info->slock, flags);
            }
      }
}


static void mxser_flush_chars(struct tty_struct *tty)
{
      struct mxser_port *info = tty->driver_data;
      unsigned long flags;

      if (info->xmit_cnt <= 0 ||
                  tty->stopped ||
                  !info->xmit_buf ||
                  (tty->hw_stopped &&
                   (info->type != PORT_16550A) &&
                   (!info->board->chip_flag)
                  ))
            return;

      spin_lock_irqsave(&info->slock, flags);

      outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
      info->IER |= UART_IER_THRI;
      outb(info->IER, info->ioaddr + UART_IER);

      spin_unlock_irqrestore(&info->slock, flags);
}

static int mxser_write_room(struct tty_struct *tty)
{
      struct mxser_port *info = tty->driver_data;
      int ret;

      ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
      if (ret < 0)
            ret = 0;
      return ret;
}

static int mxser_chars_in_buffer(struct tty_struct *tty)
{
      struct mxser_port *info = tty->driver_data;
      return info->xmit_cnt;
}

static void mxser_flush_buffer(struct tty_struct *tty)
{
      struct mxser_port *info = tty->driver_data;
      char fcr;
      unsigned long flags;


      spin_lock_irqsave(&info->slock, flags);
      info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;

      fcr = inb(info->ioaddr + UART_FCR);
      outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
            info->ioaddr + UART_FCR);
      outb(fcr, info->ioaddr + UART_FCR);

      spin_unlock_irqrestore(&info->slock, flags);

      tty_wakeup(tty);
}

/*
 * ------------------------------------------------------------
 * friends of mxser_ioctl()
 * ------------------------------------------------------------
 */
static int mxser_get_serial_info(struct mxser_port *info,
            struct serial_struct __user *retinfo)
{
      struct serial_struct tmp;

      if (!retinfo)
            return -EFAULT;
      memset(&tmp, 0, sizeof(tmp));
      tmp.type = info->type;
      tmp.line = info->tty->index;
      tmp.port = info->ioaddr;
      tmp.irq = info->board->irq;
      tmp.flags = info->flags;
      tmp.baud_base = info->baud_base;
      tmp.close_delay = info->close_delay;
      tmp.closing_wait = info->closing_wait;
      tmp.custom_divisor = info->custom_divisor;
      tmp.hub6 = 0;
      if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
            return -EFAULT;
      return 0;
}

static int mxser_set_serial_info(struct mxser_port *info,
            struct serial_struct __user *new_info)
{
      struct serial_struct new_serial;
      unsigned long sl_flags;
      unsigned int flags;
      int retval = 0;

      if (!new_info || !info->ioaddr)
            return -EFAULT;
      if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
            return -EFAULT;

      if ((new_serial.irq != info->board->irq) ||
                  (new_serial.port != info->ioaddr) ||
                  (new_serial.custom_divisor != info->custom_divisor) ||
                  (new_serial.baud_base != info->baud_base))
            return -EPERM;

      flags = info->flags & ASYNC_SPD_MASK;

      if (!capable(CAP_SYS_ADMIN)) {
            if ((new_serial.baud_base != info->baud_base) ||
                        (new_serial.close_delay != info->close_delay) ||
                        ((new_serial.flags & ~ASYNC_USR_MASK) != (info->flags & ~ASYNC_USR_MASK)))
                  return -EPERM;
            info->flags = ((info->flags & ~ASYNC_USR_MASK) |
                        (new_serial.flags & ASYNC_USR_MASK));
      } else {
            /*
             * OK, past this point, all the error checking has been done.
             * At this point, we start making changes.....
             */
            info->flags = ((info->flags & ~ASYNC_FLAGS) |
                        (new_serial.flags & ASYNC_FLAGS));
            info->close_delay = new_serial.close_delay * HZ / 100;
            info->closing_wait = new_serial.closing_wait * HZ / 100;
            info->tty->low_latency =
                        (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
            info->tty->low_latency = 0;
      }

      info->type = new_serial.type;

      process_txrx_fifo(info);

      if (info->flags & ASYNC_INITIALIZED) {
            if (flags != (info->flags & ASYNC_SPD_MASK)) {
                  spin_lock_irqsave(&info->slock, sl_flags);
                  mxser_change_speed(info, NULL);
                  spin_unlock_irqrestore(&info->slock, sl_flags);
            }
      } else
            retval = mxser_startup(info);

      return retval;
}

/*
 * mxser_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 mxser_get_lsr_info(struct mxser_port *info,
            unsigned int __user *value)
{
      unsigned char status;
      unsigned int result;
      unsigned long flags;

      spin_lock_irqsave(&info->slock, flags);
      status = inb(info->ioaddr + UART_LSR);
      spin_unlock_irqrestore(&info->slock, flags);
      result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
      return put_user(result, value);
}

/*
 * This routine sends a break character out the serial port.
 */
static void mxser_send_break(struct mxser_port *info, int duration)
{
      unsigned long flags;

      if (!info->ioaddr)
            return;
      set_current_state(TASK_INTERRUPTIBLE);
      spin_lock_irqsave(&info->slock, flags);
      outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
            info->ioaddr + UART_LCR);
      spin_unlock_irqrestore(&info->slock, flags);
      schedule_timeout(duration);
      spin_lock_irqsave(&info->slock, flags);
      outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
            info->ioaddr + UART_LCR);
      spin_unlock_irqrestore(&info->slock, flags);
}

static int mxser_tiocmget(struct tty_struct *tty, struct file *file)
{
      struct mxser_port *info = tty->driver_data;
      unsigned char control, status;
      unsigned long flags;


      if (tty->index == MXSER_PORTS)
            return -ENOIOCTLCMD;
      if (test_bit(TTY_IO_ERROR, &tty->flags))
            return -EIO;

      control = info->MCR;

      spin_lock_irqsave(&info->slock, flags);
      status = inb(info->ioaddr + UART_MSR);
      if (status & UART_MSR_ANY_DELTA)
            mxser_check_modem_status(info, status);
      spin_unlock_irqrestore(&info->slock, flags);
      return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
                ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
                ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
                ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
                ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
                ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
}

static int mxser_tiocmset(struct tty_struct *tty, struct file *file,
            unsigned int set, unsigned int clear)
{
      struct mxser_port *info = tty->driver_data;
      unsigned long flags;


      if (tty->index == MXSER_PORTS)
            return -ENOIOCTLCMD;
      if (test_bit(TTY_IO_ERROR, &tty->flags))
            return -EIO;

      spin_lock_irqsave(&info->slock, flags);

      if (set & TIOCM_RTS)
            info->MCR |= UART_MCR_RTS;
      if (set & TIOCM_DTR)
            info->MCR |= UART_MCR_DTR;

      if (clear & TIOCM_RTS)
            info->MCR &= ~UART_MCR_RTS;
      if (clear & TIOCM_DTR)
            info->MCR &= ~UART_MCR_DTR;

      outb(info->MCR, info->ioaddr + UART_MCR);
      spin_unlock_irqrestore(&info->slock, flags);
      return 0;
}

static int __init mxser_program_mode(int port)
{
      int id, i, j, n;

      outb(0, port);
      outb(0, port);
      outb(0, port);
      (void)inb(port);
      (void)inb(port);
      outb(0, port);
      (void)inb(port);

      id = inb(port + 1) & 0x1F;
      if ((id != C168_ASIC_ID) &&
                  (id != C104_ASIC_ID) &&
                  (id != C102_ASIC_ID) &&
                  (id != CI132_ASIC_ID) &&
                  (id != CI134_ASIC_ID) &&
                  (id != CI104J_ASIC_ID))
            return -1;
      for (i = 0, j = 0; i < 4; i++) {
            n = inb(port + 2);
            if (n == 'M') {
                  j = 1;
            } else if ((j == 1) && (n == 1)) {
                  j = 2;
                  break;
            } else
                  j = 0;
      }
      if (j != 2)
            id = -2;
      return id;
}

static void __init mxser_normal_mode(int port)
{
      int i, n;

      outb(0xA5, port + 1);
      outb(0x80, port + 3);
      outb(12, port + 0);     /* 9600 bps */
      outb(0, port + 1);
      outb(0x03, port + 3);   /* 8 data bits */
      outb(0x13, port + 4);   /* loop back mode */
      for (i = 0; i < 16; i++) {
            n = inb(port + 5);
            if ((n & 0x61) == 0x60)
                  break;
            if ((n & 1) == 1)
                  (void)inb(port);
      }
      outb(0x00, port + 4);
}

#define CHIP_SK   0x01  /* Serial Data Clock  in Eprom */
#define CHIP_DO   0x02  /* Serial Data Output in Eprom */
#define CHIP_CS   0x04  /* Serial Chip Select in Eprom */
#define CHIP_DI   0x08  /* Serial Data Input  in Eprom */
#define EN_CCMD   0x000 /* Chip's command register     */
#define EN0_RSARLO      0x008 /* Remote start address reg 0  */
#define EN0_RSARHI      0x009 /* Remote start address reg 1  */
#define EN0_RCNTLO      0x00A /* Remote byte count reg WR    */
#define EN0_RCNTHI      0x00B /* Remote byte count reg WR    */
#define EN0_DCFG  0x00E /* Data configuration reg WR   */
#define EN0_PORT  0x010 /* Rcv missed frame error counter RD */
#define ENC_PAGE0 0x000 /* Select page 0 of chip registers   */
#define ENC_PAGE3 0x0C0 /* Select page 3 of chip registers   */
static int __init mxser_read_register(int port, unsigned short *regs)
{
      int i, k, value, id;
      unsigned int j;

      id = mxser_program_mode(port);
      if (id < 0)
            return id;
      for (i = 0; i < 14; i++) {
            k = (i & 0x3F) | 0x180;
            for (j = 0x100; j > 0; j >>= 1) {
                  outb(CHIP_CS, port);
                  if (k & j) {
                        outb(CHIP_CS | CHIP_DO, port);
                        outb(CHIP_CS | CHIP_DO | CHIP_SK, port);  /* A? bit of read */
                  } else {
                        outb(CHIP_CS, port);
                        outb(CHIP_CS | CHIP_SK, port);      /* A? bit of read */
                  }
            }
            (void)inb(port);
            value = 0;
            for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
                  outb(CHIP_CS, port);
                  outb(CHIP_CS | CHIP_SK, port);
                  if (inb(port) & CHIP_DI)
                        value |= j;
            }
            regs[i] = value;
            outb(0, port);
      }
      mxser_normal_mode(port);
      return id;
}

static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
{
      struct mxser_port *port;
      int result, status;
      unsigned int i, j;

      switch (cmd) {
      case MOXA_GET_CONF:
/*          if (copy_to_user(argp, mxsercfg,
                        sizeof(struct mxser_hwconf) * 4))
                  return -EFAULT;
            return 0;*/
            return -ENXIO;
      case MOXA_GET_MAJOR:
            if (copy_to_user(argp, &ttymajor, sizeof(int)))
                  return -EFAULT;
            return 0;

      case MOXA_GET_CUMAJOR:
            if (copy_to_user(argp, &calloutmajor, sizeof(int)))
                  return -EFAULT;
            return 0;

      case MOXA_CHKPORTENABLE:
            result = 0;

            for (i = 0; i < MXSER_BOARDS; i++)
                  for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
                        if (mxser_boards[i].ports[j].ioaddr)
                              result |= (1 << i);

            return put_user(result, (unsigned long __user *)argp);
      case MOXA_GETDATACOUNT:
            if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
                  return -EFAULT;
            return 0;
      case MOXA_GETMSTATUS:
            for (i = 0; i < MXSER_BOARDS; i++)
                  for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
                        port = &mxser_boards[i].ports[j];

                        GMStatus[i].ri = 0;
                        if (!port->ioaddr) {
                              GMStatus[i].dcd = 0;
                              GMStatus[i].dsr = 0;
                              GMStatus[i].cts = 0;
                              continue;
                        }

                        if (!port->tty || !port->tty->termios)
                              GMStatus[i].cflag =
                                    port->normal_termios.c_cflag;
                        else
                              GMStatus[i].cflag =
                                    port->tty->termios->c_cflag;

                        status = inb(port->ioaddr + UART_MSR);
                        if (status & 0x80 /*UART_MSR_DCD */ )
                              GMStatus[i].dcd = 1;
                        else
                              GMStatus[i].dcd = 0;

                        if (status & 0x20 /*UART_MSR_DSR */ )
                              GMStatus[i].dsr = 1;
                        else
                              GMStatus[i].dsr = 0;


                        if (status & 0x10 /*UART_MSR_CTS */ )
                              GMStatus[i].cts = 1;
                        else
                              GMStatus[i].cts = 0;
                  }
            if (copy_to_user(argp, GMStatus,
                        sizeof(struct mxser_mstatus) * MXSER_PORTS))
                  return -EFAULT;
            return 0;
      case MOXA_ASPP_MON_EXT: {
            int p, shiftbit;
            unsigned long opmode;
            unsigned cflag, iflag;

            for (i = 0; i < MXSER_BOARDS; i++)
                  for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
                        port = &mxser_boards[i].ports[j];
                        if (!port->ioaddr)
                              continue;

                        status = mxser_get_msr(port->ioaddr, 0, i);

                        if (status & UART_MSR_TERI)
                              port->icount.rng++;
                        if (status & UART_MSR_DDSR)
                              port->icount.dsr++;
                        if (status & UART_MSR_DDCD)
                              port->icount.dcd++;
                        if (status & UART_MSR_DCTS)
                              port->icount.cts++;

                        port->mon_data.modem_status = status;
                        mon_data_ext.rx_cnt[i] = port->mon_data.rxcnt;
                        mon_data_ext.tx_cnt[i] = port->mon_data.txcnt;
                        mon_data_ext.up_rxcnt[i] =
                              port->mon_data.up_rxcnt;
                        mon_data_ext.up_txcnt[i] =
                              port->mon_data.up_txcnt;
                        mon_data_ext.modem_status[i] =
                              port->mon_data.modem_status;
                        mon_data_ext.baudrate[i] = port->realbaud;

                        if (!port->tty || !port->tty->termios) {
                              cflag = port->normal_termios.c_cflag;
                              iflag = port->normal_termios.c_iflag;
                        } else {
                              cflag = port->tty->termios->c_cflag;
                              iflag = port->tty->termios->c_iflag;
                        }

                        mon_data_ext.databits[i] = cflag & CSIZE;

                        mon_data_ext.stopbits[i] = cflag & CSTOPB;

                        mon_data_ext.parity[i] =
                              cflag & (PARENB | PARODD | CMSPAR);

                        mon_data_ext.flowctrl[i] = 0x00;

                        if (cflag & CRTSCTS)
                              mon_data_ext.flowctrl[i] |= 0x03;

                        if (iflag & (IXON | IXOFF))
                              mon_data_ext.flowctrl[i] |= 0x0C;

                        if (port->type == PORT_16550A)
                              mon_data_ext.fifo[i] = 1;
                        else
                              mon_data_ext.fifo[i] = 0;

                        p = i % 4;
                        shiftbit = p * 2;
                        opmode = inb(port->opmode_ioaddr) >> shiftbit;
                        opmode &= OP_MODE_MASK;

                        mon_data_ext.iftype[i] = opmode;

                  }
                  if (copy_to_user(argp, &mon_data_ext,
                                    sizeof(mon_data_ext)))
                        return -EFAULT;

                  return 0;

      } default:
            return -ENOIOCTLCMD;
      }
      return 0;
}

static int mxser_ioctl(struct tty_struct *tty, struct file *file,
            unsigned int cmd, unsigned long arg)
{
      struct mxser_port *info = tty->driver_data;
      struct async_icount cprev, cnow;    /* kernel counter temps */
      struct serial_icounter_struct __user *p_cuser;
      unsigned long templ;
      unsigned long flags;
      unsigned int i;
      void __user *argp = (void __user *)arg;
      int retval;

      if (tty->index == MXSER_PORTS)
            return mxser_ioctl_special(cmd, argp);

      if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
            int p;
            unsigned long opmode;
            static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
            int shiftbit;
            unsigned char val, mask;

            p = tty->index % 4;
            if (cmd == MOXA_SET_OP_MODE) {
                  if (get_user(opmode, (int __user *) argp))
                        return -EFAULT;
                  if (opmode != RS232_MODE &&
                              opmode != RS485_2WIRE_MODE &&
                              opmode != RS422_MODE &&
                              opmode != RS485_4WIRE_MODE)
                        return -EFAULT;
                  mask = ModeMask[p];
                  shiftbit = p * 2;
                  val = inb(info->opmode_ioaddr);
                  val &= mask;
                  val |= (opmode << shiftbit);
                  outb(val, info->opmode_ioaddr);
            } else {
                  shiftbit = p * 2;
                  opmode = inb(info->opmode_ioaddr) >> shiftbit;
                  opmode &= OP_MODE_MASK;
                  if (copy_to_user(argp, &opmode, sizeof(int)))
                        return -EFAULT;
            }
            return 0;
      }

      if (cmd == MOXA_SET_SPECIAL_BAUD_RATE) {
            int speed;

            if (get_user(speed, (int __user *)argp))
                  return -EFAULT;
            if (speed <= 0 || speed > info->max_baud)
                  return -EFAULT;
            if (!info->tty || !info->tty->termios || !info->ioaddr)
                  return 0;
            info->tty->termios->c_cflag &= ~(CBAUD | CBAUDEX);
            for (i = 0; i < BAUD_TABLE_NO; i++)
                  if (speed == mxvar_baud_table[i])
                        break;
            if (i == BAUD_TABLE_NO) {
                  info->tty->termios->c_cflag |= B_SPEC;
            } else if (speed != 0)
                  info->tty->termios->c_cflag |= mxvar_baud_table1[i];

            info->speed = speed;
            spin_lock_irqsave(&info->slock, flags);
            mxser_change_speed(info, NULL);
            spin_unlock_irqrestore(&info->slock, flags);

            return 0;
      } else if (cmd == MOXA_GET_SPECIAL_BAUD_RATE) {
            if (copy_to_user(argp, &info->speed, sizeof(int)))
                 return -EFAULT;
            return 0;
      }

      if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT && cmd != TIOCGICOUNT &&
                  test_bit(TTY_IO_ERROR, &tty->flags))
            return -EIO;

      switch (cmd) {
      case TCSBRK:            /* SVID version: non-zero arg --> no break */
            retval = tty_check_change(tty);
            if (retval)
                  return retval;
            tty_wait_until_sent(tty, 0);
            if (!arg)
                  mxser_send_break(info, HZ / 4);     /* 1/4 second */
            return 0;
      case TCSBRKP:           /* support for POSIX tcsendbreak() */
            retval = tty_check_change(tty);
            if (retval)
                  return retval;
            tty_wait_until_sent(tty, 0);
            mxser_send_break(info, arg ? arg * (HZ / 10) : HZ / 4);
            return 0;
      case TIOCGSOFTCAR:
            return put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long __user *)argp);
      case TIOCSSOFTCAR:
            if (get_user(templ, (unsigned long __user *) argp))
                  return -EFAULT;
            arg = templ;
            tty->termios->c_cflag = ((tty->termios->c_cflag & ~CLOCAL) | (arg ? CLOCAL : 0));
            return 0;
      case TIOCGSERIAL:
            return mxser_get_serial_info(info, argp);
      case TIOCSSERIAL:
            return mxser_set_serial_info(info, argp);
      case TIOCSERGETLSR:     /* Get line status register */
            return mxser_get_lsr_info(info, argp);
            /*
             * 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:
            spin_lock_irqsave(&info->slock, flags);
            cnow = info->icount;    /* note the counters on entry */
            spin_unlock_irqrestore(&info->slock, flags);

            wait_event_interruptible(info->delta_msr_wait, ({
                  cprev = cnow;
                  spin_lock_irqsave(&info->slock, flags);
                  cnow = info->icount;    /* atomic copy */
                  spin_unlock_irqrestore(&info->slock, flags);

                  ((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));
            }));
            break;
      /*
       * 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:
            spin_lock_irqsave(&info->slock, flags);
            cnow = info->icount;
            spin_unlock_irqrestore(&info->slock, flags);
            p_cuser = argp;
            if (put_user(cnow.frame, &p_cuser->frame))
                  return -EFAULT;
            if (put_user(cnow.brk, &p_cuser->brk))
                  return -EFAULT;
            if (put_user(cnow.overrun, &p_cuser->overrun))
                  return -EFAULT;
            if (put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
                  return -EFAULT;
            if (put_user(cnow.parity, &p_cuser->parity))
                  return -EFAULT;
            if (put_user(cnow.rx, &p_cuser->rx))
                  return -EFAULT;
            if (put_user(cnow.tx, &p_cuser->tx))
                  return -EFAULT;
            put_user(cnow.cts, &p_cuser->cts);
            put_user(cnow.dsr, &p_cuser->dsr);
            put_user(cnow.rng, &p_cuser->rng);
            put_user(cnow.dcd, &p_cuser->dcd);
            return 0;
      case MOXA_HighSpeedOn:
            return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
      case MOXA_SDS_RSTICOUNTER:
            info->mon_data.rxcnt = 0;
            info->mon_data.txcnt = 0;
            return 0;
      case MOXA_ASPP_SETBAUD:{
            long baud;
            if (get_user(baud, (long __user *)argp))
                  return -EFAULT;
            spin_lock_irqsave(&info->slock, flags);
            mxser_set_baud(info, baud);
            spin_unlock_irqrestore(&info->slock, flags);
            return 0;
      }
      case MOXA_ASPP_GETBAUD:
            if (copy_to_user(argp, &info->realbaud, sizeof(long)))
                  return -EFAULT;

            return 0;

      case MOXA_ASPP_OQUEUE:{
            int len, lsr;

            len = mxser_chars_in_buffer(tty);

            lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT;

            len += (lsr ? 0 : 1);

            if (copy_to_user(argp, &len, sizeof(int)))
                  return -EFAULT;

            return 0;
      }
      case MOXA_ASPP_MON: {
            int mcr, status;

            status = mxser_get_msr(info->ioaddr, 1, tty->index);
            mxser_check_modem_status(info, status);

            mcr = inb(info->ioaddr + UART_MCR);
            if (mcr & MOXA_MUST_MCR_XON_FLAG)
                  info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
            else
                  info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;

            if (mcr & MOXA_MUST_MCR_TX_XON)
                  info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
            else
                  info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;

            if (info->tty->hw_stopped)
                  info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
            else
                  info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;

            if (copy_to_user(argp, &info->mon_data,
                        sizeof(struct mxser_mon)))
                  return -EFAULT;

            return 0;
      }
      case MOXA_ASPP_LSTATUS: {
            if (copy_to_user(argp, &info->err_shadow,
                        sizeof(unsigned char)))
                  return -EFAULT;

            info->err_shadow = 0;
            return 0;
      }
      case MOXA_SET_BAUD_METHOD: {
            int method;

            if (get_user(method, (int __user *)argp))
                  return -EFAULT;
            mxser_set_baud_method[tty->index] = method;
            if (copy_to_user(argp, &method, sizeof(int)))
                  return -EFAULT;

            return 0;
      }
      default:
            return -ENOIOCTLCMD;
      }
      return 0;
}

static void mxser_stoprx(struct tty_struct *tty)
{
      struct mxser_port *info = tty->driver_data;

      info->ldisc_stop_rx = 1;
      if (I_IXOFF(tty)) {
            if (info->board->chip_flag) {
                  info->IER &= ~MOXA_MUST_RECV_ISR;
                  outb(info->IER, info->ioaddr + UART_IER);
            } else {
                  info->x_char = STOP_CHAR(tty);
                  outb(0, info->ioaddr + UART_IER);
                  info->IER |= UART_IER_THRI;
                  outb(info->IER, info->ioaddr + UART_IER);
            }
      }

      if (info->tty->termios->c_cflag & CRTSCTS) {
            info->MCR &= ~UART_MCR_RTS;
            outb(info->MCR, info->ioaddr + UART_MCR);
      }
}

/*
 * This routine is called by the upper-layer tty layer to signal that
 * incoming characters should be throttled.
 */
static void mxser_throttle(struct tty_struct *tty)
{
      mxser_stoprx(tty);
}

static void mxser_unthrottle(struct tty_struct *tty)
{
      struct mxser_port *info = tty->driver_data;

      /* startrx */
      info->ldisc_stop_rx = 0;
      if (I_IXOFF(tty)) {
            if (info->x_char)
                  info->x_char = 0;
            else {
                  if (info->board->chip_flag) {
                        info->IER |= MOXA_MUST_RECV_ISR;
                        outb(info->IER, info->ioaddr + UART_IER);
                  } else {
                        info->x_char = START_CHAR(tty);
                        outb(0, info->ioaddr + UART_IER);
                        info->IER |= UART_IER_THRI;
                        outb(info->IER, info->ioaddr + UART_IER);
                  }
            }
      }

      if (info->tty->termios->c_cflag & CRTSCTS) {
            info->MCR |= UART_MCR_RTS;
            outb(info->MCR, info->ioaddr + UART_MCR);
      }
}

/*
 * mxser_stop() and mxser_start()
 *
 * This routines are called before setting or resetting tty->stopped.
 * They enable or disable transmitter interrupts, as necessary.
 */
static void mxser_stop(struct tty_struct *tty)
{
      struct mxser_port *info = tty->driver_data;
      unsigned long flags;

      spin_lock_irqsave(&info->slock, flags);
      if (info->IER & UART_IER_THRI) {
            info->IER &= ~UART_IER_THRI;
            outb(info->IER, info->ioaddr + UART_IER);
      }
      spin_unlock_irqrestore(&info->slock, flags);
}

static void mxser_start(struct tty_struct *tty)
{
      struct mxser_port *info = tty->driver_data;
      unsigned long flags;

      spin_lock_irqsave(&info->slock, flags);
      if (info->xmit_cnt && info->xmit_buf) {
            outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
            info->IER |= UART_IER_THRI;
            outb(info->IER, info->ioaddr + UART_IER);
      }
      spin_unlock_irqrestore(&info->slock, flags);
}

static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
{
      struct mxser_port *info = tty->driver_data;
      unsigned long flags;

      spin_lock_irqsave(&info->slock, flags);
      mxser_change_speed(info, old_termios);
      spin_unlock_irqrestore(&info->slock, flags);

      if ((old_termios->c_cflag & CRTSCTS) &&
                  !(tty->termios->c_cflag & CRTSCTS)) {
            tty->hw_stopped = 0;
            mxser_start(tty);
      }

      /* Handle sw stopped */
      if ((old_termios->c_iflag & IXON) &&
                  !(tty->termios->c_iflag & IXON)) {
            tty->stopped = 0;

            if (info->board->chip_flag) {
                  spin_lock_irqsave(&info->slock, flags);
                  DISABLE_MOXA_MUST_RX_SOFTWARE_FLOW_CONTROL(info->ioaddr);
                  spin_unlock_irqrestore(&info->slock, flags);
            }

            mxser_start(tty);
      }
}

/*
 * mxser_wait_until_sent() --- wait until the transmitter is empty
 */
static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
{
      struct mxser_port *info = tty->driver_data;
      unsigned long orig_jiffies, char_time;
      int lsr;

      if (info->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(KERN_DEBUG "In rs_wait_until_sent(%d) check=%lu...",
            timeout, char_time);
      printk("jiff=%lu...", jiffies);
#endif
      while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
            printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
#endif
            schedule_timeout_interruptible(char_time);
            if (signal_pending(current))
                  break;
            if (timeout && time_after(jiffies, orig_jiffies + timeout))
                  break;
      }
      set_current_state(TASK_RUNNING);

#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
      printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
#endif
}

/*
 * This routine is called by tty_hangup() when a hangup is signaled.
 */
static void mxser_hangup(struct tty_struct *tty)
{
      struct mxser_port *info = tty->driver_data;

      mxser_flush_buffer(tty);
      mxser_shutdown(info);
      info->event = 0;
      info->count = 0;
      info->flags &= ~ASYNC_NORMAL_ACTIVE;
      info->tty = NULL;
      wake_up_interruptible(&info->open_wait);
}

/*
 * mxser_rs_break() --- routine which turns the break handling on or off
 */
static void mxser_rs_break(struct tty_struct *tty, int break_state)
{
      struct mxser_port *info = tty->driver_data;
      unsigned long flags;

      spin_lock_irqsave(&info->slock, flags);
      if (break_state == -1)
            outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
                  info->ioaddr + UART_LCR);
      else
            outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
                  info->ioaddr + UART_LCR);
      spin_unlock_irqrestore(&info->slock, flags);
}

static void mxser_receive_chars(struct mxser_port *port, int *status)
{
      struct tty_struct *tty = port->tty;
      unsigned char ch, gdl;
      int ignored = 0;
      int cnt = 0;
      int recv_room;
      int max = 256;

      recv_room = tty->receive_room;
      if ((recv_room == 0) && (!port->ldisc_stop_rx))
            mxser_stoprx(tty);

      if (port->board->chip_flag != MOXA_OTHER_UART) {

            if (*status & UART_LSR_SPECIAL)
                  goto intr_old;
            if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
                        (*status & MOXA_MUST_LSR_RERR))
                  goto intr_old;
            if (*status & MOXA_MUST_LSR_RERR)
                  goto intr_old;

            gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);

            if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
                  gdl &= MOXA_MUST_GDL_MASK;
            if (gdl >= recv_room) {
                  if (!port->ldisc_stop_rx)
                        mxser_stoprx(tty);
            }
            while (gdl--) {
                  ch = inb(port->ioaddr + UART_RX);
                  tty_insert_flip_char(tty, ch, 0);
                  cnt++;
            }
            goto end_intr;
      }
intr_old:

      do {
            if (max-- < 0)
                  break;

            ch = inb(port->ioaddr + UART_RX);
            if (port->board->chip_flag && (*status & UART_LSR_OE))
                  outb(0x23, port->ioaddr + UART_FCR);
            *status &= port->read_status_mask;
            if (*status & port->ignore_status_mask) {
                  if (++ignored > 100)
                        break;
            } else {
                  char flag = 0;
                  if (*status & UART_LSR_SPECIAL) {
                        if (*status & UART_LSR_BI) {
                              flag = TTY_BREAK;
                              port->icount.brk++;

                              if (port->flags & ASYNC_SAK)
                                    do_SAK(tty);
                        } else if (*status & UART_LSR_PE) {
                              flag = TTY_PARITY;
                              port->icount.parity++;
                        } else if (*status & UART_LSR_FE) {
                              flag = TTY_FRAME;
                              port->icount.frame++;
                        } else if (*status & UART_LSR_OE) {
                              flag = TTY_OVERRUN;
                              port->icount.overrun++;
                        } else
                              flag = TTY_BREAK;
                  }
                  tty_insert_flip_char(tty, ch, flag);
                  cnt++;
                  if (cnt >= recv_room) {
                        if (!port->ldisc_stop_rx)
                              mxser_stoprx(tty);
                        break;
                  }

            }

            if (port->board->chip_flag)
                  break;

            *status = inb(port->ioaddr + UART_LSR);
      } while (*status & UART_LSR_DR);

end_intr:
      mxvar_log.rxcnt[port->tty->index] += cnt;
      port->mon_data.rxcnt += cnt;
      port->mon_data.up_rxcnt += cnt;

      /*
       * We are called from an interrupt context with &port->slock
       * being held. Drop it temporarily in order to prevent
       * recursive locking.
       */
      spin_unlock(&port->slock);
      tty_flip_buffer_push(tty);
      spin_lock(&port->slock);
}

static void mxser_transmit_chars(struct mxser_port *port)
{
      int count, cnt;

      if (port->x_char) {
            outb(port->x_char, port->ioaddr + UART_TX);
            port->x_char = 0;
            mxvar_log.txcnt[port->tty->index]++;
            port->mon_data.txcnt++;
            port->mon_data.up_txcnt++;
            port->icount.tx++;
            return;
      }

      if (port->xmit_buf == 0)
            return;

      if ((port->xmit_cnt <= 0) || port->tty->stopped ||
                  (port->tty->hw_stopped &&
                  (port->type != PORT_16550A) &&
                  (!port->board->chip_flag))) {
            port->IER &= ~UART_IER_THRI;
            outb(port->IER, port->ioaddr + UART_IER);
            return;
      }

      cnt = port->xmit_cnt;
      count = port->xmit_fifo_size;
      do {
            outb(port->xmit_buf[port->xmit_tail++],
                  port->ioaddr + UART_TX);
            port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
            if (--port->xmit_cnt <= 0)
                  break;
      } while (--count > 0);
      mxvar_log.txcnt[port->tty->index] += (cnt - port->xmit_cnt);

      port->mon_data.txcnt += (cnt - port->xmit_cnt);
      port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
      port->icount.tx += (cnt - port->xmit_cnt);

      if (port->xmit_cnt < WAKEUP_CHARS)
            tty_wakeup(port->tty);

      if (port->xmit_cnt <= 0) {
            port->IER &= ~UART_IER_THRI;
            outb(port->IER, port->ioaddr + UART_IER);
      }
}

/*
 * This is the serial driver's generic interrupt routine
 */
static irqreturn_t mxser_interrupt(int irq, void *dev_id)
{
      int status, iir, i;
      struct mxser_board *brd = NULL;
      struct mxser_port *port;
      int max, irqbits, bits, msr;
      unsigned int int_cnt, pass_counter = 0;
      int handled = IRQ_NONE;

      for (i = 0; i < MXSER_BOARDS; i++)
            if (dev_id == &mxser_boards[i]) {
                  brd = dev_id;
                  break;
            }

      if (i == MXSER_BOARDS)
            goto irq_stop;
      if (brd == NULL)
            goto irq_stop;
      max = brd->info->nports;
      while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
            irqbits = inb(brd->vector) & brd->vector_mask;
            if (irqbits == brd->vector_mask)
                  break;

            handled = IRQ_HANDLED;
            for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
                  if (irqbits == brd->vector_mask)
                        break;
                  if (bits & irqbits)
                        continue;
                  port = &brd->ports[i];

                  int_cnt = 0;
                  spin_lock(&port->slock);
                  do {
                        iir = inb(port->ioaddr + UART_IIR);
                        if (iir & UART_IIR_NO_INT)
                              break;
                        iir &= MOXA_MUST_IIR_MASK;
                        if (!port->tty ||
                                    (port->flags & ASYNC_CLOSING) ||
                                    !(port->flags &
                                          ASYNC_INITIALIZED)) {
                              status = inb(port->ioaddr + UART_LSR);
                              outb(0x27, port->ioaddr + UART_FCR);
                              inb(port->ioaddr + UART_MSR);
                              break;
                        }

                        status = inb(port->ioaddr + UART_LSR);

                        if (status & UART_LSR_PE)
                              port->err_shadow |= NPPI_NOTIFY_PARITY;
                        if (status & UART_LSR_FE)
                              port->err_shadow |= NPPI_NOTIFY_FRAMING;
                        if (status & UART_LSR_OE)
                              port->err_shadow |=
                                    NPPI_NOTIFY_HW_OVERRUN;
                        if (status & UART_LSR_BI)
                              port->err_shadow |= NPPI_NOTIFY_BREAK;

                        if (port->board->chip_flag) {
                              if (iir == MOXA_MUST_IIR_GDA ||
                                  iir == MOXA_MUST_IIR_RDA ||
                                  iir == MOXA_MUST_IIR_RTO ||
                                  iir == MOXA_MUST_IIR_LSR)
                                    mxser_receive_chars(port,
                                                &status);

                        } else {
                              status &= port->read_status_mask;
                              if (status & UART_LSR_DR)
                                    mxser_receive_chars(port,
                                                &status);
                        }
                        msr = inb(port->ioaddr + UART_MSR);
                        if (msr & UART_MSR_ANY_DELTA)
                              mxser_check_modem_status(port, msr);

                        if (port->board->chip_flag) {
                              if (iir == 0x02 && (status &
                                                UART_LSR_THRE))
                                    mxser_transmit_chars(port);
                        } else {
                              if (status & UART_LSR_THRE)
                                    mxser_transmit_chars(port);
                        }
                  } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
                  spin_unlock(&port->slock);
            }
      }

irq_stop:
      return handled;
}

static const struct tty_operations mxser_ops = {
      .open = mxser_open,
      .close = mxser_close,
      .write = mxser_write,
      .put_char = mxser_put_char,
      .flush_chars = mxser_flush_chars,
      .write_room = mxser_write_room,
      .chars_in_buffer = mxser_chars_in_buffer,
      .flush_buffer = mxser_flush_buffer,
      .ioctl = mxser_ioctl,
      .throttle = mxser_throttle,
      .unthrottle = mxser_unthrottle,
      .set_termios = mxser_set_termios,
      .stop = mxser_stop,
      .start = mxser_start,
      .hangup = mxser_hangup,
      .break_ctl = mxser_rs_break,
      .wait_until_sent = mxser_wait_until_sent,
      .tiocmget = mxser_tiocmget,
      .tiocmset = mxser_tiocmset,
};

/*
 * The MOXA Smartio/Industio serial driver boot-time initialization code!
 */

static void mxser_release_res(struct mxser_board *brd, struct pci_dev *pdev,
            unsigned int irq)
{
      if (irq)
            free_irq(brd->irq, brd);
      if (pdev != NULL) {     /* PCI */
#ifdef CONFIG_PCI
            pci_release_region(pdev, 2);
            pci_release_region(pdev, 3);
#endif
      } else {
            release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
            release_region(brd->vector, 1);
      }
}

static int __devinit mxser_initbrd(struct mxser_board *brd,
            struct pci_dev *pdev)
{
      struct mxser_port *info;
      unsigned int i;
      int retval;

      printk(KERN_INFO "max. baud rate = %d bps.\n", brd->ports[0].max_baud);

      for (i = 0; i < brd->info->nports; i++) {
            info = &brd->ports[i];
            info->board = brd;
            info->stop_rx = 0;
            info->ldisc_stop_rx = 0;

            /* Enhance mode enabled here */
            if (brd->chip_flag != MOXA_OTHER_UART)
                  ENABLE_MOXA_MUST_ENCHANCE_MODE(info->ioaddr);

            info->flags = ASYNC_SHARE_IRQ;
            info->type = brd->uart_type;

            process_txrx_fifo(info);

            info->custom_divisor = info->baud_base * 16;
            info->close_delay = 5 * HZ / 10;
            info->closing_wait = 30 * HZ;
            info->normal_termios = mxvar_sdriver->init_termios;
            init_waitqueue_head(&info->open_wait);
            init_waitqueue_head(&info->delta_msr_wait);
            info->speed = 9600;
            memset(&info->mon_data, 0, sizeof(struct mxser_mon));
            info->err_shadow = 0;
            spin_lock_init(&info->slock);

            /* before set INT ISR, disable all int */
            outb(inb(info->ioaddr + UART_IER) & 0xf0,
                  info->ioaddr + UART_IER);
      }

      retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
                  brd);
      if (retval) {
            printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
                  "conflict with another device.\n",
                  brd->info->name, brd->irq);
            /* We hold resources, we need to release them. */
            mxser_release_res(brd, pdev, 0);
      }
      return retval;
}

static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
{
      int id, i, bits;
      unsigned short regs[16], irq;
      unsigned char scratch, scratch2;

      brd->chip_flag = MOXA_OTHER_UART;

      id = mxser_read_register(cap, regs);
      switch (id) {
      case C168_ASIC_ID:
            brd->info = &mxser_cards[0];
            break;
      case C104_ASIC_ID:
            brd->info = &mxser_cards[1];
            break;
      case CI104J_ASIC_ID:
            brd->info = &mxser_cards[2];
            break;
      case C102_ASIC_ID:
            brd->info = &mxser_cards[5];
            break;
      case CI132_ASIC_ID:
            brd->info = &mxser_cards[6];
            break;
      case CI134_ASIC_ID:
            brd->info = &mxser_cards[7];
            break;
      default:
            return 0;
      }

      irq = 0;
      /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
         Flag-hack checks if configuration should be read as 2-port here. */
      if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
            irq = regs[9] & 0xF000;
            irq = irq | (irq >> 4);
            if (irq != (regs[9] & 0xFF00))
                  return MXSER_ERR_IRQ_CONFLIT;
      } else if (brd->info->nports == 4) {
            irq = regs[9] & 0xF000;
            irq = irq | (irq >> 4);
            irq = irq | (irq >> 8);
            if (irq != regs[9])
                  return MXSER_ERR_IRQ_CONFLIT;
      } else if (brd->info->nports == 8) {
            irq = regs[9] & 0xF000;
            irq = irq | (irq >> 4);
            irq = irq | (irq >> 8);
            if ((irq != regs[9]) || (irq != regs[10]))
                  return MXSER_ERR_IRQ_CONFLIT;
      }

      if (!irq)
            return MXSER_ERR_IRQ;
      brd->irq = ((int)(irq & 0xF000) >> 12);
      for (i = 0; i < 8; i++)
            brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
      if ((regs[12] & 0x80) == 0)
            return MXSER_ERR_VECTOR;
      brd->vector = (int)regs[11];  /* interrupt vector */
      if (id == 1)
            brd->vector_mask = 0x00FF;
      else
            brd->vector_mask = 0x000F;
      for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
            if (regs[12] & bits) {
                  brd->ports[i].baud_base = 921600;
                  brd->ports[i].max_baud = 921600;
            } else {
                  brd->ports[i].baud_base = 115200;
                  brd->ports[i].max_baud = 115200;
            }
      }
      scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
      outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
      outb(0, cap + UART_EFR);      /* EFR is the same as FCR */
      outb(scratch2, cap + UART_LCR);
      outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
      scratch = inb(cap + UART_IIR);

      if (scratch & 0xC0)
            brd->uart_type = PORT_16550A;
      else
            brd->uart_type = PORT_16450;
      if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
                  "mxser(IO)"))
            return MXSER_ERR_IOADDR;
      if (!request_region(brd->vector, 1, "mxser(vector)")) {
            release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
            return MXSER_ERR_VECTOR;
      }
      return brd->info->nports;
}

static int __devinit mxser_probe(struct pci_dev *pdev,
            const struct pci_device_id *ent)
{
#ifdef CONFIG_PCI
      struct mxser_board *brd;
      unsigned int i, j;
      unsigned long ioaddress;
      int retval = -EINVAL;

      for (i = 0; i < MXSER_BOARDS; i++)
            if (mxser_boards[i].info == NULL)
                  break;

      if (i >= MXSER_BOARDS) {
            printk(KERN_ERR "Too many Smartio/Industio family boards found "
                  "(maximum %d), board not configured\n", MXSER_BOARDS);
            goto err;
      }

      brd = &mxser_boards[i];
      brd->idx = i * MXSER_PORTS_PER_BOARD;
      printk(KERN_INFO "Found MOXA %s board (BusNo=%d, DevNo=%d)\n",
            mxser_cards[ent->driver_data].name,
            pdev->bus->number, PCI_SLOT(pdev->devfn));

      retval = pci_enable_device(pdev);
      if (retval) {
            printk(KERN_ERR "Moxa SmartI/O PCI enable fail !\n");
            goto err;
      }

      /* io address */
      ioaddress = pci_resource_start(pdev, 2);
      retval = pci_request_region(pdev, 2, "mxser(IO)");
      if (retval)
            goto err;

      brd->info = &mxser_cards[ent->driver_data];
      for (i = 0; i < brd->info->nports; i++)
            brd->ports[i].ioaddr = ioaddress + 8 * i;

      /* vector */
      ioaddress = pci_resource_start(pdev, 3);
      retval = pci_request_region(pdev, 3, "mxser(vector)");
      if (retval)
            goto err_relio;
      brd->vector = ioaddress;

      /* irq */
      brd->irq = pdev->irq;

      brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
      brd->uart_type = PORT_16550A;
      brd->vector_mask = 0;

      for (i = 0; i < brd->info->nports; i++) {
            for (j = 0; j < UART_INFO_NUM; j++) {
                  if (Gpci_uart_info[j].type == brd->chip_flag) {
                        brd->ports[i].max_baud =
                              Gpci_uart_info[j].max_baud;

                        /* exception....CP-102 */
                        if (brd->info->flags & MXSER_HIGHBAUD)
                              brd->ports[i].max_baud = 921600;
                        break;
                  }
            }
      }

      if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
            for (i = 0; i < brd->info->nports; i++) {
                  if (i < 4)
                        brd->ports[i].opmode_ioaddr = ioaddress + 4;
                  else
                        brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
            }
            outb(0, ioaddress + 4); /* default set to RS232 mode */
            outb(0, ioaddress + 0x0c);    /* default set to RS232 mode */
      }

      for (i = 0; i < brd->info->nports; i++) {
            brd->vector_mask |= (1 << i);
            brd->ports[i].baud_base = 921600;
      }

      /* mxser_initbrd will hook ISR. */
      retval = mxser_initbrd(brd, pdev);
      if (retval)
            goto err_null;

      for (i = 0; i < brd->info->nports; i++)
            tty_register_device(mxvar_sdriver, brd->idx + i, &pdev->dev);

      pci_set_drvdata(pdev, brd);

      return 0;
err_relio:
      pci_release_region(pdev, 2);
err_null:
      brd->info = NULL;
err:
      return retval;
#else
      return -ENODEV;
#endif
}

static void __devexit mxser_remove(struct pci_dev *pdev)
{
      struct mxser_board *brd = pci_get_drvdata(pdev);
      unsigned int i;

      for (i = 0; i < brd->info->nports; i++)
            tty_unregister_device(mxvar_sdriver, brd->idx + i);

      mxser_release_res(brd, pdev, 1);
      brd->info = NULL;
}

static struct pci_driver mxser_driver = {
      .name = "mxser",
      .id_table = mxser_pcibrds,
      .probe = mxser_probe,
      .remove = __devexit_p(mxser_remove)
};

static int __init mxser_module_init(void)
{
      struct mxser_board *brd;
      unsigned long cap;
      unsigned int i, m, isaloop;
      int retval, b;

      pr_debug("Loading module mxser ...\n");

      mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
      if (!mxvar_sdriver)
            return -ENOMEM;

      printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
            MXSER_VERSION);

      /* Initialize the tty_driver structure */
      mxvar_sdriver->owner = THIS_MODULE;
      mxvar_sdriver->magic = TTY_DRIVER_MAGIC;
      mxvar_sdriver->name = "ttyMI";
      mxvar_sdriver->major = ttymajor;
      mxvar_sdriver->minor_start = 0;
      mxvar_sdriver->num = MXSER_PORTS + 1;
      mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
      mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
      mxvar_sdriver->init_termios = tty_std_termios;
      mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
      mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
      tty_set_operations(mxvar_sdriver, &mxser_ops);

      retval = tty_register_driver(mxvar_sdriver);
      if (retval) {
            printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
                        "tty driver !\n");
            goto err_put;
      }

      mxvar_diagflag = 0;

      m = 0;
      /* Start finding ISA boards here */
      for (isaloop = 0; isaloop < 2; isaloop++)
            for (b = 0; b < MXSER_BOARDS && m < MXSER_BOARDS; b++) {
                  if (!isaloop)
                        cap = mxserBoardCAP[b]; /* predefined */
                  else
                        cap = ioaddr[b]; /* module param */

                  if (!cap)
                        continue;

                  brd = &mxser_boards[m];
                  retval = mxser_get_ISA_conf(cap, brd);

                  if (retval != 0)
                        printk(KERN_INFO "Found MOXA %s board "
                              "(CAP=0x%x)\n",
                              brd->info->name, ioaddr[b]);

                  if (retval <= 0) {
                        if (retval == MXSER_ERR_IRQ)
                              printk(KERN_ERR "Invalid interrupt "
                                    "number, board not "
                                    "configured\n");
                        else if (retval == MXSER_ERR_IRQ_CONFLIT)
                              printk(KERN_ERR "Invalid interrupt "
                                    "number, board not "
                                    "configured\n");
                        else if (retval == MXSER_ERR_VECTOR)
                              printk(KERN_ERR "Invalid interrupt "
                                    "vector, board not "
                                    "configured\n");
                        else if (retval == MXSER_ERR_IOADDR)
                              printk(KERN_ERR "Invalid I/O address, "
                                    "board not configured\n");

                        brd->info = NULL;
                        continue;
                  }

                  /* mxser_initbrd will hook ISR. */
                  if (mxser_initbrd(brd, NULL) < 0) {
                        brd->info = NULL;
                        continue;
                  }

                  brd->idx = m * MXSER_PORTS_PER_BOARD;
                  for (i = 0; i < brd->info->nports; i++)
                        tty_register_device(mxvar_sdriver, brd->idx + i,
                                    NULL);

                  m++;
            }

      retval = pci_register_driver(&mxser_driver);
      if (retval) {
            printk(KERN_ERR "Can't register pci driver\n");
            if (!m) {
                  retval = -ENODEV;
                  goto err_unr;
            } /* else: we have some ISA cards under control */
      }

      pr_debug("Done.\n");

      return 0;
err_unr:
      tty_unregister_driver(mxvar_sdriver);
err_put:
      put_tty_driver(mxvar_sdriver);
      return retval;
}

static void __exit mxser_module_exit(void)
{
      unsigned int i, j;

      pr_debug("Unloading module mxser ...\n");

      pci_unregister_driver(&mxser_driver);

      for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
            if (mxser_boards[i].info != NULL)
                  for (j = 0; j < mxser_boards[i].info->nports; j++)
                        tty_unregister_device(mxvar_sdriver,
                                    mxser_boards[i].idx + j);
      tty_unregister_driver(mxvar_sdriver);
      put_tty_driver(mxvar_sdriver);

      for (i = 0; i < MXSER_BOARDS; i++)
            if (mxser_boards[i].info != NULL)
                  mxser_release_res(&mxser_boards[i], NULL, 1);

      pr_debug("Done.\n");
}

module_init(mxser_module_init);
module_exit(mxser_module_exit);

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