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moxa.c

/*****************************************************************************/
/*
 *           moxa.c  -- MOXA Intellio family multiport serial driver.
 *
 *      Copyright (C) 1999-2000  Moxa Technologies (support@moxa.com.tw).
 *
 *      This code is loosely based on the 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.
 *
 *      This program is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU General Public License for more details.
 *
 *      You should have received a copy of the GNU General Public License
 *      along with this program; if not, write to the Free Software
 *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 *    MOXA Intellio Series Driver
 *      for             : LINUX
 *      date            : 1999/1/7
 *      version         : 5.1
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/ioport.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/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/serial.h>
#include <linux/tty_driver.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/bitops.h>

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

#define           MOXA_VERSION            "5.1k"

#define MOXAMAJOR       172
#define MOXACUMAJOR     173

#define put_to_user(arg1, arg2) put_user(arg1, (unsigned long *)arg2)
#define get_from_user(arg1, arg2) get_user(arg1, (unsigned int *)arg2)

#define MAX_BOARDS            4     /* Don't change this value */
#define MAX_PORTS_PER_BOARD   32    /* Don't change this value */
#define MAX_PORTS             128   /* Don't change this value */

/*
 *    Define the Moxa PCI vendor and device IDs.
 */
#define MOXA_BUS_TYPE_ISA           0
#define MOXA_BUS_TYPE_PCI           1

#ifndef     PCI_VENDOR_ID_MOXA
#define     PCI_VENDOR_ID_MOXA      0x1393
#endif
#ifndef PCI_DEVICE_ID_CP204J
#define PCI_DEVICE_ID_CP204J  0x2040
#endif
#ifndef PCI_DEVICE_ID_C218
#define PCI_DEVICE_ID_C218    0x2180
#endif
#ifndef PCI_DEVICE_ID_C320
#define PCI_DEVICE_ID_C320    0x3200
#endif

enum {
      MOXA_BOARD_C218_PCI = 1,
      MOXA_BOARD_C218_ISA,
      MOXA_BOARD_C320_PCI,
      MOXA_BOARD_C320_ISA,
      MOXA_BOARD_CP204J,
};

static char *moxa_brdname[] =
{
      "C218 Turbo PCI series",
      "C218 Turbo ISA series",
      "C320 Turbo PCI series",
      "C320 Turbo ISA series",
      "CP-204J series",
};

#ifdef CONFIG_PCI
static struct pci_device_id moxa_pcibrds[] = {
      { PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_C218, PCI_ANY_ID, PCI_ANY_ID, 
        0, 0, MOXA_BOARD_C218_PCI },
      { PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_C320, PCI_ANY_ID, PCI_ANY_ID, 
        0, 0, MOXA_BOARD_C320_PCI },
      { PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_CP204J, PCI_ANY_ID, PCI_ANY_ID, 
        0, 0, MOXA_BOARD_CP204J },
      { 0 }
};
MODULE_DEVICE_TABLE(pci, moxa_pcibrds);
#endif /* CONFIG_PCI */

typedef struct _moxa_isa_board_conf {
      int boardType;
      int numPorts;
      unsigned long baseAddr;
} moxa_isa_board_conf;

static moxa_isa_board_conf moxa_isa_boards[] =
{
/*       {MOXA_BOARD_C218_ISA,8,0xDC000}, */
};

typedef struct _moxa_pci_devinfo {
      ushort busNum;
      ushort devNum;
} moxa_pci_devinfo;

typedef struct _moxa_board_conf {
      int boardType;
      int numPorts;
      unsigned long baseAddr;
      int busType;
      moxa_pci_devinfo pciInfo;
} moxa_board_conf;

static moxa_board_conf moxa_boards[MAX_BOARDS];
static void __iomem *moxaBaseAddr[MAX_BOARDS];
static int loadstat[MAX_BOARDS];

struct moxa_str {
      int type;
      int port;
      int close_delay;
      unsigned short closing_wait;
      int count;
      int blocked_open;
      long event; /* long req'd for set_bit --RR */
      int asyncflags;
      unsigned long statusflags;
      struct tty_struct *tty;
      int cflag;
      wait_queue_head_t open_wait;
      wait_queue_head_t close_wait;
      struct work_struct tqueue;
};

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

static struct mxser_mstatus GMStatus[MAX_PORTS];

/* statusflags */
#define TXSTOPPED 0x1
#define LOWWAIT   0x2
#define EMPTYWAIT 0x4
#define THROTTLE  0x8

/* event */
#define MOXA_EVENT_HANGUP     1

#define SERIAL_DO_RESTART


#define SERIAL_TYPE_NORMAL    1

#define WAKEUP_CHARS          256

#define PORTNO(x)       ((x)->index)

static int verbose = 0;
static int ttymajor = MOXAMAJOR;
/* Variables for insmod */
#ifdef MODULE
static int baseaddr[]   =     {0, 0, 0, 0};
static int type[] =     {0, 0, 0, 0};
static int numports[]   =     {0, 0, 0, 0};
#endif

MODULE_AUTHOR("William Chen");
MODULE_DESCRIPTION("MOXA Intellio Family Multiport Board Device Driver");
MODULE_LICENSE("GPL");
#ifdef MODULE
module_param_array(type, int, NULL, 0);
module_param_array(baseaddr, int, NULL, 0);
module_param_array(numports, int, NULL, 0);
#endif
module_param(ttymajor, int, 0);
module_param(verbose, bool, 0644);

static struct tty_driver *moxaDriver;
static struct moxa_str moxaChannels[MAX_PORTS];
static unsigned char *moxaXmitBuff;
static int moxaTimer_on;
static struct timer_list moxaTimer;
static int moxaEmptyTimer_on[MAX_PORTS];
static struct timer_list moxaEmptyTimer[MAX_PORTS];
static struct semaphore moxaBuffSem;

/*
 * static functions:
 */
static void do_moxa_softint(void *);
static int moxa_open(struct tty_struct *, struct file *);
static void moxa_close(struct tty_struct *, struct file *);
static int moxa_write(struct tty_struct *, const unsigned char *, int);
static int moxa_write_room(struct tty_struct *);
static void moxa_flush_buffer(struct tty_struct *);
static int moxa_chars_in_buffer(struct tty_struct *);
static void moxa_flush_chars(struct tty_struct *);
static void moxa_put_char(struct tty_struct *, unsigned char);
static int moxa_ioctl(struct tty_struct *, struct file *, unsigned int, unsigned long);
static void moxa_throttle(struct tty_struct *);
static void moxa_unthrottle(struct tty_struct *);
static void moxa_set_termios(struct tty_struct *, struct termios *);
static void moxa_stop(struct tty_struct *);
static void moxa_start(struct tty_struct *);
static void moxa_hangup(struct tty_struct *);
static int moxa_tiocmget(struct tty_struct *tty, struct file *file);
static int moxa_tiocmset(struct tty_struct *tty, struct file *file,
                   unsigned int set, unsigned int clear);
static void moxa_poll(unsigned long);
static void set_tty_param(struct tty_struct *);
static int block_till_ready(struct tty_struct *, struct file *,
                      struct moxa_str *);
static void setup_empty_event(struct tty_struct *);
static void check_xmit_empty(unsigned long);
static void shut_down(struct moxa_str *);
static void receive_data(struct moxa_str *);
/*
 * moxa board interface functions:
 */
static void MoxaDriverInit(void);
static int MoxaDriverIoctl(unsigned int, unsigned long, int);
static int MoxaDriverPoll(void);
static int MoxaPortsOfCard(int);
static int MoxaPortIsValid(int);
static void MoxaPortEnable(int);
static void MoxaPortDisable(int);
static long MoxaPortGetMaxBaud(int);
static long MoxaPortSetBaud(int, long);
static int MoxaPortSetTermio(int, struct termios *);
static int MoxaPortGetLineOut(int, int *, int *);
static void MoxaPortLineCtrl(int, int, int);
static void MoxaPortFlowCtrl(int, int, int, int, int, int);
static int MoxaPortLineStatus(int);
static int MoxaPortDCDChange(int);
static int MoxaPortDCDON(int);
static void MoxaPortFlushData(int, int);
static int MoxaPortWriteData(int, unsigned char *, int);
static int MoxaPortReadData(int, struct tty_struct *tty);
static int MoxaPortTxQueue(int);
static int MoxaPortRxQueue(int);
static int MoxaPortTxFree(int);
static void MoxaPortTxDisable(int);
static void MoxaPortTxEnable(int);
static int MoxaPortResetBrkCnt(int);
static void MoxaPortSendBreak(int, int);
static int moxa_get_serial_info(struct moxa_str *, struct serial_struct __user *);
static int moxa_set_serial_info(struct moxa_str *, struct serial_struct __user *);
static void MoxaSetFifo(int port, int enable);

static struct tty_operations moxa_ops = {
      .open = moxa_open,
      .close = moxa_close,
      .write = moxa_write,
      .write_room = moxa_write_room,
      .flush_buffer = moxa_flush_buffer,
      .chars_in_buffer = moxa_chars_in_buffer,
      .flush_chars = moxa_flush_chars,
      .put_char = moxa_put_char,
      .ioctl = moxa_ioctl,
      .throttle = moxa_throttle,
      .unthrottle = moxa_unthrottle,
      .set_termios = moxa_set_termios,
      .stop = moxa_stop,
      .start = moxa_start,
      .hangup = moxa_hangup,
      .tiocmget = moxa_tiocmget,
      .tiocmset = moxa_tiocmset,
};

static DEFINE_SPINLOCK(moxa_lock);

#ifdef CONFIG_PCI
static int moxa_get_PCI_conf(struct pci_dev *p, int board_type, moxa_board_conf * board)
{
      board->baseAddr = pci_resource_start (p, 2);
      board->boardType = board_type;
      switch (board_type) {
      case MOXA_BOARD_C218_ISA:
      case MOXA_BOARD_C218_PCI:
            board->numPorts = 8;
            break;

      case MOXA_BOARD_CP204J:
            board->numPorts = 4;
            break;
      default:
            board->numPorts = 0;
            break;
      }
      board->busType = MOXA_BUS_TYPE_PCI;
      board->pciInfo.busNum = p->bus->number;
      board->pciInfo.devNum = p->devfn >> 3;

      return (0);
}
#endif /* CONFIG_PCI */

static int __init moxa_init(void)
{
      int i, numBoards;
      struct moxa_str *ch;

      printk(KERN_INFO "MOXA Intellio family driver version %s\n", MOXA_VERSION);
      moxaDriver = alloc_tty_driver(MAX_PORTS + 1);
      if (!moxaDriver)
            return -ENOMEM;

      init_MUTEX(&moxaBuffSem);
      moxaDriver->owner = THIS_MODULE;
      moxaDriver->name = "ttyMX";
      moxaDriver->major = ttymajor;
      moxaDriver->minor_start = 0;
      moxaDriver->type = TTY_DRIVER_TYPE_SERIAL;
      moxaDriver->subtype = SERIAL_TYPE_NORMAL;
      moxaDriver->init_termios = tty_std_termios;
      moxaDriver->init_termios.c_iflag = 0;
      moxaDriver->init_termios.c_oflag = 0;
      moxaDriver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
      moxaDriver->init_termios.c_lflag = 0;
      moxaDriver->flags = TTY_DRIVER_REAL_RAW;
      tty_set_operations(moxaDriver, &moxa_ops);

      moxaXmitBuff = NULL;

      for (i = 0, ch = moxaChannels; i < MAX_PORTS; i++, ch++) {
            ch->type = PORT_16550A;
            ch->port = i;
            INIT_WORK(&ch->tqueue, do_moxa_softint, ch);
            ch->tty = NULL;
            ch->close_delay = 5 * HZ / 10;
            ch->closing_wait = 30 * HZ;
            ch->count = 0;
            ch->blocked_open = 0;
            ch->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
            init_waitqueue_head(&ch->open_wait);
            init_waitqueue_head(&ch->close_wait);
      }

      for (i = 0; i < MAX_BOARDS; i++) {
            moxa_boards[i].boardType = 0;
            moxa_boards[i].numPorts = 0;
            moxa_boards[i].baseAddr = 0;
            moxa_boards[i].busType = 0;
            moxa_boards[i].pciInfo.busNum = 0;
            moxa_boards[i].pciInfo.devNum = 0;
      }
      MoxaDriverInit();
      printk("Tty devices major number = %d\n", ttymajor);

      if (tty_register_driver(moxaDriver)) {
            printk(KERN_ERR "Couldn't install MOXA Smartio family driver !\n");
            put_tty_driver(moxaDriver);
            return -1;
      }
      for (i = 0; i < MAX_PORTS; i++) {
            init_timer(&moxaEmptyTimer[i]);
            moxaEmptyTimer[i].function = check_xmit_empty;
            moxaEmptyTimer[i].data = (unsigned long) & moxaChannels[i];
            moxaEmptyTimer_on[i] = 0;
      }

      init_timer(&moxaTimer);
      moxaTimer.function = moxa_poll;
      moxaTimer.expires = jiffies + (HZ / 50);
      moxaTimer_on = 1;
      add_timer(&moxaTimer);

      /* Find the boards defined in source code */
      numBoards = 0;
      for (i = 0; i < MAX_BOARDS; i++) {
            if ((moxa_isa_boards[i].boardType == MOXA_BOARD_C218_ISA) ||
             (moxa_isa_boards[i].boardType == MOXA_BOARD_C320_ISA)) {
                  moxa_boards[numBoards].boardType = moxa_isa_boards[i].boardType;
                  if (moxa_isa_boards[i].boardType == MOXA_BOARD_C218_ISA)
                        moxa_boards[numBoards].numPorts = 8;
                  else
                        moxa_boards[numBoards].numPorts = moxa_isa_boards[i].numPorts;
                  moxa_boards[numBoards].busType = MOXA_BUS_TYPE_ISA;
                  moxa_boards[numBoards].baseAddr = moxa_isa_boards[i].baseAddr;
                  if (verbose)
                        printk("Board %2d: %s board(baseAddr=%lx)\n",
                               numBoards + 1,
                               moxa_brdname[moxa_boards[numBoards].boardType - 1],
                               moxa_boards[numBoards].baseAddr);
                  numBoards++;
            }
      }
      /* Find the boards defined form module args. */
#ifdef MODULE
      for (i = 0; i < MAX_BOARDS; i++) {
            if ((type[i] == MOXA_BOARD_C218_ISA) ||
                (type[i] == MOXA_BOARD_C320_ISA)) {
                  if (verbose)
                        printk("Board %2d: %s board(baseAddr=%lx)\n",
                               numBoards + 1,
                               moxa_brdname[type[i] - 1],
                               (unsigned long) baseaddr[i]);
                  if (numBoards >= MAX_BOARDS) {
                        if (verbose)
                              printk("More than %d MOXA Intellio family boards found. Board is ignored.", MAX_BOARDS);
                        continue;
                  }
                  moxa_boards[numBoards].boardType = type[i];
                  if (moxa_isa_boards[i].boardType == MOXA_BOARD_C218_ISA)
                        moxa_boards[numBoards].numPorts = 8;
                  else
                        moxa_boards[numBoards].numPorts = numports[i];
                  moxa_boards[numBoards].busType = MOXA_BUS_TYPE_ISA;
                  moxa_boards[numBoards].baseAddr = baseaddr[i];
                  numBoards++;
            }
      }
#endif
      /* Find PCI boards here */
#ifdef CONFIG_PCI
      {
            struct pci_dev *p = NULL;
            int n = ARRAY_SIZE(moxa_pcibrds) - 1;
            i = 0;
            while (i < n) {
                  while ((p = pci_get_device(moxa_pcibrds[i].vendor, moxa_pcibrds[i].device, p))!=NULL)
                  {
                        if (pci_enable_device(p))
                              continue;
                        if (numBoards >= MAX_BOARDS) {
                              if (verbose)
                                    printk("More than %d MOXA Intellio family boards found. Board is ignored.", MAX_BOARDS);
                        } else {
                              moxa_get_PCI_conf(p, moxa_pcibrds[i].driver_data,
                                    &moxa_boards[numBoards]);
                              numBoards++;
                        }
                  }
                  i++;
            }
      }
#endif
      for (i = 0; i < numBoards; i++) {
            moxaBaseAddr[i] = ioremap((unsigned long) moxa_boards[i].baseAddr, 0x4000);
      }

      return (0);
}

static void __exit moxa_exit(void)
{
      int i;

      if (verbose)
            printk("Unloading module moxa ...\n");

      if (moxaTimer_on)
            del_timer(&moxaTimer);

      for (i = 0; i < MAX_PORTS; i++)
            if (moxaEmptyTimer_on[i])
                  del_timer(&moxaEmptyTimer[i]);

      if (tty_unregister_driver(moxaDriver))
            printk("Couldn't unregister MOXA Intellio family serial driver\n");
      put_tty_driver(moxaDriver);
      if (verbose)
            printk("Done\n");
}

module_init(moxa_init);
module_exit(moxa_exit);

static void do_moxa_softint(void *private_)
{
      struct moxa_str *ch = (struct moxa_str *) private_;
      struct tty_struct *tty;

      if (ch && (tty = ch->tty)) {
            if (test_and_clear_bit(MOXA_EVENT_HANGUP, &ch->event)) {
                  tty_hangup(tty);  /* FIXME: module removal race here - AKPM */
                  wake_up_interruptible(&ch->open_wait);
                  ch->asyncflags &= ~ASYNC_NORMAL_ACTIVE;
            }
      }
}

static int moxa_open(struct tty_struct *tty, struct file *filp)
{
      struct moxa_str *ch;
      int port;
      int retval;
      unsigned long page;

      port = PORTNO(tty);
      if (port == MAX_PORTS) {
            return (0);
      }
      if (!MoxaPortIsValid(port)) {
            tty->driver_data = NULL;
            return (-ENODEV);
      }
      down(&moxaBuffSem);
      if (!moxaXmitBuff) {
            page = get_zeroed_page(GFP_KERNEL);
            if (!page) {
                  up(&moxaBuffSem);
                  return (-ENOMEM);
            }
            /* This test is guarded by the BuffSem so no longer needed
               delete me in 2.5 */
            if (moxaXmitBuff)
                  free_page(page);
            else
                  moxaXmitBuff = (unsigned char *) page;
      }
      up(&moxaBuffSem);

      ch = &moxaChannels[port];
      ch->count++;
      tty->driver_data = ch;
      ch->tty = tty;
      if (!(ch->asyncflags & ASYNC_INITIALIZED)) {
            ch->statusflags = 0;
            set_tty_param(tty);
            MoxaPortLineCtrl(ch->port, 1, 1);
            MoxaPortEnable(ch->port);
            ch->asyncflags |= ASYNC_INITIALIZED;
      }
      retval = block_till_ready(tty, filp, ch);

      moxa_unthrottle(tty);

      if (ch->type == PORT_16550A) {
            MoxaSetFifo(ch->port, 1);
      } else {
            MoxaSetFifo(ch->port, 0);
      }

      return (retval);
}

static void moxa_close(struct tty_struct *tty, struct file *filp)
{
      struct moxa_str *ch;
      int port;

      port = PORTNO(tty);
      if (port == MAX_PORTS) {
            return;
      }
      if (!MoxaPortIsValid(port)) {
#ifdef SERIAL_DEBUG_CLOSE
            printk("Invalid portno in moxa_close\n");
#endif
            tty->driver_data = NULL;
            return;
      }
      if (tty->driver_data == NULL) {
            return;
      }
      if (tty_hung_up_p(filp)) {
            return;
      }
      ch = (struct moxa_str *) tty->driver_data;

      if ((tty->count == 1) && (ch->count != 1)) {
            printk("moxa_close: bad serial port count; tty->count is 1, "
                   "ch->count is %d\n", ch->count);
            ch->count = 1;
      }
      if (--ch->count < 0) {
            printk("moxa_close: bad serial port count, device=%s\n",
                   tty->name);
            ch->count = 0;
      }
      if (ch->count) {
            return;
      }
      ch->asyncflags |= ASYNC_CLOSING;

      ch->cflag = tty->termios->c_cflag;
      if (ch->asyncflags & ASYNC_INITIALIZED) {
            setup_empty_event(tty);
            tty_wait_until_sent(tty, 30 * HZ);  /* 30 seconds timeout */
            moxaEmptyTimer_on[ch->port] = 0;
            del_timer(&moxaEmptyTimer[ch->port]);
      }
      shut_down(ch);
      MoxaPortFlushData(port, 2);

      if (tty->driver->flush_buffer)
            tty->driver->flush_buffer(tty);
      tty_ldisc_flush(tty);
                  
      tty->closing = 0;
      ch->event = 0;
      ch->tty = NULL;
      if (ch->blocked_open) {
            if (ch->close_delay) {
                  msleep_interruptible(jiffies_to_msecs(ch->close_delay));
            }
            wake_up_interruptible(&ch->open_wait);
      }
      ch->asyncflags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
      wake_up_interruptible(&ch->close_wait);
}

static int moxa_write(struct tty_struct *tty,
                  const unsigned char *buf, int count)
{
      struct moxa_str *ch;
      int len, port;
      unsigned long flags;

      ch = (struct moxa_str *) tty->driver_data;
      if (ch == NULL)
            return (0);
      port = ch->port;

      spin_lock_irqsave(&moxa_lock, flags);
      len = MoxaPortWriteData(port, (unsigned char *) buf, count);
      spin_unlock_irqrestore(&moxa_lock, flags);

      /*********************************************
      if ( !(ch->statusflags & LOWWAIT) &&
           ((len != count) || (MoxaPortTxFree(port) <= 100)) )
      ************************************************/
      ch->statusflags |= LOWWAIT;
      return (len);
}

static int moxa_write_room(struct tty_struct *tty)
{
      struct moxa_str *ch;

      if (tty->stopped)
            return (0);
      ch = (struct moxa_str *) tty->driver_data;
      if (ch == NULL)
            return (0);
      return (MoxaPortTxFree(ch->port));
}

static void moxa_flush_buffer(struct tty_struct *tty)
{
      struct moxa_str *ch = (struct moxa_str *) tty->driver_data;

      if (ch == NULL)
            return;
      MoxaPortFlushData(ch->port, 1);
      tty_wakeup(tty);
}

static int moxa_chars_in_buffer(struct tty_struct *tty)
{
      int chars;
      struct moxa_str *ch = (struct moxa_str *) tty->driver_data;

      /*
       * Sigh...I have to check if driver_data is NULL here, because
       * if an open() fails, the TTY subsystem eventually calls
       * tty_wait_until_sent(), which calls the driver's chars_in_buffer()
       * routine.  And since the open() failed, we return 0 here.  TDJ
       */
      if (ch == NULL)
            return (0);
      chars = MoxaPortTxQueue(ch->port);
      if (chars) {
            /*
             * Make it possible to wakeup anything waiting for output
             * in tty_ioctl.c, etc.
             */
            if (!(ch->statusflags & EMPTYWAIT))
                  setup_empty_event(tty);
      }
      return (chars);
}

static void moxa_flush_chars(struct tty_struct *tty)
{
      /*
       * Don't think I need this, because this is called to empty the TX
       * buffer for the 16450, 16550, etc.
       */
}

static void moxa_put_char(struct tty_struct *tty, unsigned char c)
{
      struct moxa_str *ch;
      int port;
      unsigned long flags;

      ch = (struct moxa_str *) tty->driver_data;
      if (ch == NULL)
            return;
      port = ch->port;
      spin_lock_irqsave(&moxa_lock, flags);
      moxaXmitBuff[0] = c;
      MoxaPortWriteData(port, moxaXmitBuff, 1);
      spin_unlock_irqrestore(&moxa_lock, flags);
      /************************************************
      if ( !(ch->statusflags & LOWWAIT) && (MoxaPortTxFree(port) <= 100) )
      *************************************************/
      ch->statusflags |= LOWWAIT;
}

static int moxa_tiocmget(struct tty_struct *tty, struct file *file)
{
      struct moxa_str *ch = (struct moxa_str *) tty->driver_data;
      int port;
      int flag = 0, dtr, rts;

      port = PORTNO(tty);
      if ((port != MAX_PORTS) && (!ch))
            return (-EINVAL);

      MoxaPortGetLineOut(ch->port, &dtr, &rts);
      if (dtr)
            flag |= TIOCM_DTR;
      if (rts)
            flag |= TIOCM_RTS;
      dtr = MoxaPortLineStatus(ch->port);
      if (dtr & 1)
            flag |= TIOCM_CTS;
      if (dtr & 2)
            flag |= TIOCM_DSR;
      if (dtr & 4)
            flag |= TIOCM_CD;
      return flag;
}

static int moxa_tiocmset(struct tty_struct *tty, struct file *file,
                   unsigned int set, unsigned int clear)
{
      struct moxa_str *ch = (struct moxa_str *) tty->driver_data;
      int port;
      int dtr, rts;

      port = PORTNO(tty);
      if ((port != MAX_PORTS) && (!ch))
            return (-EINVAL);

      MoxaPortGetLineOut(ch->port, &dtr, &rts);
      if (set & TIOCM_RTS)
            rts = 1;
      if (set & TIOCM_DTR)
            dtr = 1;
      if (clear & TIOCM_RTS)
            rts = 0;
      if (clear & TIOCM_DTR)
            dtr = 0;
      MoxaPortLineCtrl(ch->port, dtr, rts);
      return 0;
}

static int moxa_ioctl(struct tty_struct *tty, struct file *file,
                  unsigned int cmd, unsigned long arg)
{
      struct moxa_str *ch = (struct moxa_str *) tty->driver_data;
      register int port;
      void __user *argp = (void __user *)arg;
      int retval;

      port = PORTNO(tty);
      if ((port != MAX_PORTS) && (!ch))
            return (-EINVAL);

      switch (cmd) {
      case TCSBRK:            /* SVID version: non-zero arg --> no break */
            retval = tty_check_change(tty);
            if (retval)
                  return (retval);
            setup_empty_event(tty);
            tty_wait_until_sent(tty, 0);
            if (!arg)
                  MoxaPortSendBreak(ch->port, 0);
            return (0);
      case TCSBRKP:           /* support for POSIX tcsendbreak() */
            retval = tty_check_change(tty);
            if (retval)
                  return (retval);
            setup_empty_event(tty);
            tty_wait_until_sent(tty, 0);
            MoxaPortSendBreak(ch->port, arg);
            return (0);
      case TIOCGSOFTCAR:
            return put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long __user *) argp);
      case TIOCSSOFTCAR:
            if(get_user(retval, (unsigned long __user *) argp))
                  return -EFAULT;
            arg = retval;
            tty->termios->c_cflag = ((tty->termios->c_cflag & ~CLOCAL) |
                               (arg ? CLOCAL : 0));
            if (C_CLOCAL(tty))
                  ch->asyncflags &= ~ASYNC_CHECK_CD;
            else
                  ch->asyncflags |= ASYNC_CHECK_CD;
            return (0);
      case TIOCGSERIAL:
            return moxa_get_serial_info(ch, argp);

      case TIOCSSERIAL:
            return moxa_set_serial_info(ch, argp);
      default:
            retval = MoxaDriverIoctl(cmd, arg, port);
      }
      return (retval);
}

static void moxa_throttle(struct tty_struct *tty)
{
      struct moxa_str *ch = (struct moxa_str *) tty->driver_data;

      ch->statusflags |= THROTTLE;
}

static void moxa_unthrottle(struct tty_struct *tty)
{
      struct moxa_str *ch = (struct moxa_str *) tty->driver_data;

      ch->statusflags &= ~THROTTLE;
}

static void moxa_set_termios(struct tty_struct *tty,
                       struct termios *old_termios)
{
      struct moxa_str *ch = (struct moxa_str *) tty->driver_data;

      if (ch == NULL)
            return;
      set_tty_param(tty);
      if (!(old_termios->c_cflag & CLOCAL) &&
          (tty->termios->c_cflag & CLOCAL))
            wake_up_interruptible(&ch->open_wait);
}

static void moxa_stop(struct tty_struct *tty)
{
      struct moxa_str *ch = (struct moxa_str *) tty->driver_data;

      if (ch == NULL)
            return;
      MoxaPortTxDisable(ch->port);
      ch->statusflags |= TXSTOPPED;
}


static void moxa_start(struct tty_struct *tty)
{
      struct moxa_str *ch = (struct moxa_str *) tty->driver_data;

      if (ch == NULL)
            return;

      if (!(ch->statusflags & TXSTOPPED))
            return;

      MoxaPortTxEnable(ch->port);
      ch->statusflags &= ~TXSTOPPED;
}

static void moxa_hangup(struct tty_struct *tty)
{
      struct moxa_str *ch = (struct moxa_str *) tty->driver_data;

      moxa_flush_buffer(tty);
      shut_down(ch);
      ch->event = 0;
      ch->count = 0;
      ch->asyncflags &= ~ASYNC_NORMAL_ACTIVE;
      ch->tty = NULL;
      wake_up_interruptible(&ch->open_wait);
}

static void moxa_poll(unsigned long ignored)
{
      register int card;
      struct moxa_str *ch;
      struct tty_struct *tp;
      int i, ports;

      moxaTimer_on = 0;
      del_timer(&moxaTimer);

      if (MoxaDriverPoll() < 0) {
            moxaTimer.function = moxa_poll;
            moxaTimer.expires = jiffies + (HZ / 50);
            moxaTimer_on = 1;
            add_timer(&moxaTimer);
            return;
      }
      for (card = 0; card < MAX_BOARDS; card++) {
            if ((ports = MoxaPortsOfCard(card)) <= 0)
                  continue;
            ch = &moxaChannels[card * MAX_PORTS_PER_BOARD];
            for (i = 0; i < ports; i++, ch++) {
                  if ((ch->asyncflags & ASYNC_INITIALIZED) == 0)
                        continue;
                  if (!(ch->statusflags & THROTTLE) &&
                      (MoxaPortRxQueue(ch->port) > 0))
                        receive_data(ch);
                  if ((tp = ch->tty) == 0)
                        continue;
                  if (ch->statusflags & LOWWAIT) {
                        if (MoxaPortTxQueue(ch->port) <= WAKEUP_CHARS) {
                              if (!tp->stopped) {
                                    ch->statusflags &= ~LOWWAIT;
                                    tty_wakeup(tp);
                              }
                        }
                  }
                  if (!I_IGNBRK(tp) && (MoxaPortResetBrkCnt(ch->port) > 0)) {
                        tty_insert_flip_char(tp, 0, TTY_BREAK);
                        tty_schedule_flip(tp);
                  }
                  if (MoxaPortDCDChange(ch->port)) {
                        if (ch->asyncflags & ASYNC_CHECK_CD) {
                              if (MoxaPortDCDON(ch->port))
                                    wake_up_interruptible(&ch->open_wait);
                              else {
                                    set_bit(MOXA_EVENT_HANGUP, &ch->event);
                                    schedule_work(&ch->tqueue);
                              }
                        }
                  }
            }
      }

      moxaTimer.function = moxa_poll;
      moxaTimer.expires = jiffies + (HZ / 50);
      moxaTimer_on = 1;
      add_timer(&moxaTimer);
}

/******************************************************************************/

static void set_tty_param(struct tty_struct *tty)
{
      register struct termios *ts;
      struct moxa_str *ch;
      int rts, cts, txflow, rxflow, xany;

      ch = (struct moxa_str *) tty->driver_data;
      ts = tty->termios;
      if (ts->c_cflag & CLOCAL)
            ch->asyncflags &= ~ASYNC_CHECK_CD;
      else
            ch->asyncflags |= ASYNC_CHECK_CD;
      rts = cts = txflow = rxflow = xany = 0;
      if (ts->c_cflag & CRTSCTS)
            rts = cts = 1;
      if (ts->c_iflag & IXON)
            txflow = 1;
      if (ts->c_iflag & IXOFF)
            rxflow = 1;
      if (ts->c_iflag & IXANY)
            xany = 1;
      MoxaPortFlowCtrl(ch->port, rts, cts, txflow, rxflow, xany);
      MoxaPortSetTermio(ch->port, ts);
}

static int block_till_ready(struct tty_struct *tty, struct file *filp,
                      struct moxa_str *ch)
{
      DECLARE_WAITQUEUE(wait,current);
      unsigned long flags;
      int retval;
      int do_clocal = C_CLOCAL(tty);

      /*
       * If the device is in the middle of being closed, then block
       * until it's done, and then try again.
       */
      if (tty_hung_up_p(filp) || (ch->asyncflags & ASYNC_CLOSING)) {
            if (ch->asyncflags & ASYNC_CLOSING)
                  interruptible_sleep_on(&ch->close_wait);
#ifdef SERIAL_DO_RESTART
            if (ch->asyncflags & ASYNC_HUP_NOTIFY)
                  return (-EAGAIN);
            else
                  return (-ERESTARTSYS);
#else
            return (-EAGAIN);
#endif
      }
      /*
       * If non-blocking mode is set, then make the check up front
       * and then exit.
       */
      if (filp->f_flags & O_NONBLOCK) {
            ch->asyncflags |= ASYNC_NORMAL_ACTIVE;
            return (0);
      }
      /*
       * Block waiting for the carrier detect and the line to become free
       */
      retval = 0;
      add_wait_queue(&ch->open_wait, &wait);
#ifdef SERIAL_DEBUG_OPEN
      printk("block_til_ready before block: ttys%d, count = %d\n",
             ch->line, ch->count);
#endif
      spin_lock_irqsave(&moxa_lock, flags);
      if (!tty_hung_up_p(filp))
            ch->count--;
      ch->blocked_open++;
      spin_unlock_irqrestore(&moxa_lock, flags);

      while (1) {
            set_current_state(TASK_INTERRUPTIBLE);
            if (tty_hung_up_p(filp) ||
                !(ch->asyncflags & ASYNC_INITIALIZED)) {
#ifdef SERIAL_DO_RESTART
                  if (ch->asyncflags & ASYNC_HUP_NOTIFY)
                        retval = -EAGAIN;
                  else
                        retval = -ERESTARTSYS;
#else
                  retval = -EAGAIN;
#endif
                  break;
            }
            if (!(ch->asyncflags & ASYNC_CLOSING) && (do_clocal ||
                                    MoxaPortDCDON(ch->port)))
                  break;

            if (signal_pending(current)) {
                  retval = -ERESTARTSYS;
                  break;
            }
            schedule();
      }
      set_current_state(TASK_RUNNING);
      remove_wait_queue(&ch->open_wait, &wait);

      spin_lock_irqsave(&moxa_lock, flags);
      if (!tty_hung_up_p(filp))
            ch->count++;
      ch->blocked_open--;
      spin_unlock_irqrestore(&moxa_lock, flags);
#ifdef SERIAL_DEBUG_OPEN
      printk("block_til_ready after blocking: ttys%d, count = %d\n",
             ch->line, ch->count);
#endif
      if (retval)
            return (retval);
      /* FIXME: review to see if we need to use set_bit on these */
      ch->asyncflags |= ASYNC_NORMAL_ACTIVE;
      return 0;
}

static void setup_empty_event(struct tty_struct *tty)
{
      struct moxa_str *ch = tty->driver_data;
      unsigned long flags;

      spin_lock_irqsave(&moxa_lock, flags);
      ch->statusflags |= EMPTYWAIT;
      moxaEmptyTimer_on[ch->port] = 0;
      del_timer(&moxaEmptyTimer[ch->port]);
      moxaEmptyTimer[ch->port].expires = jiffies + HZ;
      moxaEmptyTimer_on[ch->port] = 1;
      add_timer(&moxaEmptyTimer[ch->port]);
      spin_unlock_irqrestore(&moxa_lock, flags);
}

static void check_xmit_empty(unsigned long data)
{
      struct moxa_str *ch;

      ch = (struct moxa_str *) data;
      moxaEmptyTimer_on[ch->port] = 0;
      del_timer(&moxaEmptyTimer[ch->port]);
      if (ch->tty && (ch->statusflags & EMPTYWAIT)) {
            if (MoxaPortTxQueue(ch->port) == 0) {
                  ch->statusflags &= ~EMPTYWAIT;
                  tty_wakeup(ch->tty);
                  return;
            }
            moxaEmptyTimer[ch->port].expires = jiffies + HZ;
            moxaEmptyTimer_on[ch->port] = 1;
            add_timer(&moxaEmptyTimer[ch->port]);
      } else
            ch->statusflags &= ~EMPTYWAIT;
}

static void shut_down(struct moxa_str *ch)
{
      struct tty_struct *tp;

      if (!(ch->asyncflags & ASYNC_INITIALIZED))
            return;

      tp = ch->tty;

      MoxaPortDisable(ch->port);

      /*
       * If we're a modem control device and HUPCL is on, drop RTS & DTR.
       */
      if (tp->termios->c_cflag & HUPCL)
            MoxaPortLineCtrl(ch->port, 0, 0);

      ch->asyncflags &= ~ASYNC_INITIALIZED;
}

static void receive_data(struct moxa_str *ch)
{
      struct tty_struct *tp;
      struct termios *ts;
      unsigned long flags;

      ts = NULL;
      tp = ch->tty;
      if (tp)
            ts = tp->termios;
      /**************************************************
      if ( !tp || !ts || !(ts->c_cflag & CREAD) ) {
      *****************************************************/
      if (!tp || !ts) {
            MoxaPortFlushData(ch->port, 0);
            return;
      }
      spin_lock_irqsave(&moxa_lock, flags);
      MoxaPortReadData(ch->port, tp);
      spin_unlock_irqrestore(&moxa_lock, flags);
      tty_schedule_flip(tp);
}

#define Magic_code      0x404

/*
 *    System Configuration
 */
/*
 *    for C218 BIOS initialization
 */
#define C218_ConfBase   0x800
#define C218_status     (C218_ConfBase + 0)     /* BIOS running status    */
#define C218_diag (C218_ConfBase + 2)     /* diagnostic status      */
#define C218_key  (C218_ConfBase + 4)     /* WORD (0x218 for C218) */
#define C218DLoad_len   (C218_ConfBase + 6)     /* WORD           */
#define C218check_sum   (C218_ConfBase + 8)     /* BYTE           */
#define C218chksum_ok   (C218_ConfBase + 0x0a)  /* BYTE (1:ok)            */
#define C218_TestRx     (C218_ConfBase + 0x10)  /* 8 bytes for 8 ports    */
#define C218_TestTx     (C218_ConfBase + 0x18)  /* 8 bytes for 8 ports    */
#define C218_RXerr      (C218_ConfBase + 0x20)  /* 8 bytes for 8 ports    */
#define C218_ErrFlag    (C218_ConfBase + 0x28)  /* 8 bytes for 8 ports    */

#define C218_LoadBuf    0x0F00
#define C218_KeyCode    0x218
#define CP204J_KeyCode  0x204

/*
 *    for C320 BIOS initialization
 */
#define C320_ConfBase   0x800
#define C320_LoadBuf    0x0f00
#define STS_init  0x05  /* for C320_status        */

#define C320_status     C320_ConfBase + 0 /* BIOS running status    */
#define C320_diag C320_ConfBase + 2 /* diagnostic status      */
#define C320_key  C320_ConfBase + 4 /* WORD (0320H for C320) */
#define C320DLoad_len   C320_ConfBase + 6 /* WORD           */
#define C320check_sum   C320_ConfBase + 8 /* WORD           */
#define C320chksum_ok   C320_ConfBase + 0x0a    /* WORD (1:ok)            */
#define C320bapi_len    C320_ConfBase + 0x0c    /* WORD           */
#define C320UART_no     C320_ConfBase + 0x0e    /* WORD           */

#define C320_KeyCode    0x320

#define FixPage_addr    0x0000      /* starting addr of static page  */
#define DynPage_addr    0x2000      /* starting addr of dynamic page */
#define C218_start      0x3000      /* starting addr of C218 BIOS prg */
#define Control_reg     0x1ff0      /* select page and reset control */
#define HW_reset  0x80

/*
 *    Function Codes
 */
#define FC_CardReset    0x80
#define FC_ChannelReset 1     /* C320 firmware not supported */
#define FC_EnableCH     2
#define FC_DisableCH    3
#define FC_SetParam     4
#define FC_SetMode      5
#define FC_SetRate      6
#define FC_LineControl  7
#define FC_LineStatus   8
#define FC_XmitControl  9
#define FC_FlushQueue   10
#define FC_SendBreak    11
#define FC_StopBreak    12
#define FC_LoopbackON   13
#define FC_LoopbackOFF  14
#define FC_ClrIrqTable  15
#define FC_SendXon      16
#define FC_SetTermIrq   17    /* C320 firmware not supported */
#define FC_SetCntIrq    18    /* C320 firmware not supported */
#define FC_SetBreakIrq  19
#define FC_SetLineIrq   20
#define FC_SetFlowCtl   21
#define FC_GenIrq 22
#define FC_InCD180      23
#define FC_OutCD180     24
#define FC_InUARTreg    23
#define FC_OutUARTreg   24
#define FC_SetXonXoff   25
#define FC_OutCD180CCR  26
#define FC_ExtIQueue    27
#define FC_ExtOQueue    28
#define FC_ClrLineIrq   29
#define FC_HWFlowCtl    30
#define FC_GetClockRate 35
#define FC_SetBaud      36
#define FC_SetDataMode  41
#define FC_GetCCSR      43
#define FC_GetDataError 45
#define FC_RxControl    50
#define FC_ImmSend      51
#define FC_SetXonState  52
#define FC_SetXoffState 53
#define FC_SetRxFIFOTrig 54
#define FC_SetTxFIFOCnt 55
#define FC_UnixRate     56
#define FC_UnixResetTimer 57

#define     RxFIFOTrig1 0
#define     RxFIFOTrig4 1
#define     RxFIFOTrig8 2
#define     RxFIFOTrig14      3

/*
 *    Dual-Ported RAM
 */
#define DRAM_global     0
#define INT_data  (DRAM_global + 0)
#define Config_base     (DRAM_global + 0x108)

#define IRQindex  (INT_data + 0)
#define IRQpending      (INT_data + 4)
#define IRQtable  (INT_data + 8)

/*
 *    Interrupt Status
 */
#define IntrRx          0x01  /* receiver data O.K.             */
#define IntrTx          0x02  /* transmit buffer empty  */
#define IntrFunc  0x04  /* function complete              */
#define IntrBreak 0x08  /* received break         */
#define IntrLine  0x10  /* line status change
                           for transmitter                */
#define IntrIntr  0x20  /* received INTR code             */
#define IntrQuit  0x40  /* received QUIT code             */
#define IntrEOF   0x80  /* received EOF code              */

#define IntrRxTrigger   0x100 /* rx data count reach tigger value */
#define IntrTxTrigger   0x200 /* tx data count below trigger value */

#define Magic_no  (Config_base + 0)
#define Card_model_no   (Config_base + 2)
#define Total_ports     (Config_base + 4)
#define Module_cnt      (Config_base + 8)
#define Module_no (Config_base + 10)
#define Timer_10ms      (Config_base + 14)
#define Disable_IRQ     (Config_base + 20)
#define TMS320_PORT1    (Config_base + 22)
#define TMS320_PORT2    (Config_base + 24)
#define TMS320_CLOCK    (Config_base + 26)

/*
 *    DATA BUFFER in DRAM
 */
#define Extern_table    0x400 /* Base address of the external table
                           (24 words *    64) total 3K bytes
                           (24 words * 128) total 6K bytes */
#define Extern_size     0x60  /* 96 bytes                       */
#define RXrptr          0x00  /* read pointer for RX buffer     */
#define RXwptr          0x02  /* write pointer for RX buffer    */
#define TXrptr          0x04  /* read pointer for TX buffer     */
#define TXwptr          0x06  /* write pointer for TX buffer    */
#define HostStat  0x08  /* IRQ flag and general flag      */
#define FlagStat  0x0A
#define FlowControl     0x0C  /* B7 B6 B5 B4 B3 B2 B1 B0              */
                              /*  x  x  x  x  |  |  |  |            */
                              /*              |  |  |  + CTS flow   */
                              /*              |  |  +--- RTS flow   */
                              /*              |  +------ TX Xon/Xoff */
                              /*              +--------- RX Xon/Xoff */
#define Break_cnt 0x0E  /* received break count   */
#define CD180TXirq      0x10  /* if non-0: enable TX irq        */
#define RX_mask   0x12
#define TX_mask   0x14
#define Ofs_rxb   0x16
#define Ofs_txb   0x18
#define Page_rxb  0x1A
#define Page_txb  0x1C
#define EndPage_rxb     0x1E
#define EndPage_txb     0x20
#define Data_error      0x22
#define RxTrigger 0x28
#define TxTrigger 0x2a

#define rRXwptr   0x34
#define Low_water 0x36

#define FuncCode  0x40
#define FuncArg   0x42
#define FuncArg1  0x44

#define C218rx_size     0x2000      /* 8K bytes */
#define C218tx_size     0x8000      /* 32K bytes */

#define C218rx_mask     (C218rx_size - 1)
#define C218tx_mask     (C218tx_size - 1)

#define C320p8rx_size   0x2000
#define C320p8tx_size   0x8000
#define C320p8rx_mask   (C320p8rx_size - 1)
#define C320p8tx_mask   (C320p8tx_size - 1)

#define C320p16rx_size  0x2000
#define C320p16tx_size  0x4000
#define C320p16rx_mask  (C320p16rx_size - 1)
#define C320p16tx_mask  (C320p16tx_size - 1)

#define C320p24rx_size  0x2000
#define C320p24tx_size  0x2000
#define C320p24rx_mask  (C320p24rx_size - 1)
#define C320p24tx_mask  (C320p24tx_size - 1)

#define C320p32rx_size  0x1000
#define C320p32tx_size  0x1000
#define C320p32rx_mask  (C320p32rx_size - 1)
#define C320p32tx_mask  (C320p32tx_size - 1)

#define Page_size 0x2000
#define Page_mask (Page_size - 1)
#define C218rx_spage    3
#define C218tx_spage    4
#define C218rx_pageno   1
#define C218tx_pageno   4
#define C218buf_pageno  5

#define C320p8rx_spage  3
#define C320p8tx_spage  4
#define C320p8rx_pgno   1
#define C320p8tx_pgno   4
#define C320p8buf_pgno  5

#define C320p16rx_spage 3
#define C320p16tx_spage 4
#define C320p16rx_pgno  1
#define C320p16tx_pgno  2
#define C320p16buf_pgno 3

#define C320p24rx_spage 3
#define C320p24tx_spage 4
#define C320p24rx_pgno  1
#define C320p24tx_pgno  1
#define C320p24buf_pgno 2

#define C320p32rx_spage 3
#define C320p32tx_ofs   C320p32rx_size
#define C320p32tx_spage 3
#define C320p32buf_pgno 1

/*
 *    Host Status
 */
#define WakeupRx  0x01
#define WakeupTx  0x02
#define WakeupBreak     0x08
#define WakeupLine      0x10
#define WakeupIntr      0x20
#define WakeupQuit      0x40
#define WakeupEOF 0x80  /* used in VTIME control */
#define WakeupRxTrigger 0x100
#define WakeupTxTrigger 0x200
/*
 *    Flag status
 */
#define Rx_over         0x01
#define Xoff_state      0x02
#define Tx_flowOff      0x04
#define Tx_enable 0x08
#define CTS_state 0x10
#define DSR_state 0x20
#define DCD_state 0x80
/*
 *    FlowControl
 */
#define CTS_FlowCtl     1
#define RTS_FlowCtl     2
#define Tx_FlowCtl      4
#define Rx_FlowCtl      8
#define IXM_IXANY 0x10

#define LowWater  128

#define DTR_ON          1
#define RTS_ON          2
#define CTS_ON          1
#define DSR_ON          2
#define DCD_ON          8

/* mode definition */
#define     MX_CS8            0x03
#define     MX_CS7            0x02
#define     MX_CS6            0x01
#define     MX_CS5            0x00

#define     MX_STOP1    0x00
#define     MX_STOP15   0x04
#define     MX_STOP2    0x08

#define     MX_PARNONE  0x00
#define     MX_PAREVEN  0x40
#define     MX_PARODD   0xC0

/*
 *    Query
 */
#define QueryPort MAX_PORTS



struct mon_str {
      int tick;
      int rxcnt[MAX_PORTS];
      int txcnt[MAX_PORTS];
};
typedef struct mon_str mon_st;

#define     DCD_changed 0x01
#define     DCD_oldstate      0x80

static unsigned char moxaBuff[10240];
static void __iomem *moxaIntNdx[MAX_BOARDS];
static void __iomem *moxaIntPend[MAX_BOARDS];
static void __iomem *moxaIntTable[MAX_BOARDS];
static char moxaChkPort[MAX_PORTS];
static char moxaLineCtrl[MAX_PORTS];
static void __iomem *moxaTableAddr[MAX_PORTS];
static long moxaCurBaud[MAX_PORTS];
static char moxaDCDState[MAX_PORTS];
static char moxaLowChkFlag[MAX_PORTS];
static int moxaLowWaterChk;
static int moxaCard;
static mon_st moxaLog;
static int moxaFuncTout;
static ushort moxaBreakCnt[MAX_PORTS];

static void moxadelay(int);
static void moxafunc(void __iomem *, int, ushort);
static void wait_finish(void __iomem *);
static void low_water_check(void __iomem *);
static int moxaloadbios(int, unsigned char __user *, int);
static int moxafindcard(int);
static int moxaload320b(int, unsigned char __user *, int);
static int moxaloadcode(int, unsigned char __user *, int);
static int moxaloadc218(int, void __iomem *, int);
static int moxaloadc320(int, void __iomem *, int, int *);

/*****************************************************************************
 *    Driver level functions:                                    *
 *    1. MoxaDriverInit(void);                                   *
 *    2. MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port);   *
 *    3. MoxaDriverPoll(void);                                   *
 *****************************************************************************/
void MoxaDriverInit(void)
{
      int i;

      moxaFuncTout = HZ / 2;  /* 500 mini-seconds */
      moxaCard = 0;
      moxaLog.tick = 0;
      moxaLowWaterChk = 0;
      for (i = 0; i < MAX_PORTS; i++) {
            moxaChkPort[i] = 0;
            moxaLowChkFlag[i] = 0;
            moxaLineCtrl[i] = 0;
            moxaLog.rxcnt[i] = 0;
            moxaLog.txcnt[i] = 0;
      }
}

#define     MOXA        0x400
#define MOXA_GET_IQUEUE       (MOXA + 1)  /* get input buffered count */
#define MOXA_GET_OQUEUE       (MOXA + 2)  /* get output buffered count */
#define MOXA_INIT_DRIVER      (MOXA + 6)  /* moxaCard=0 */
#define MOXA_LOAD_BIOS        (MOXA + 9)  /* download BIOS */
#define MOXA_FIND_BOARD       (MOXA + 10) /* Check if MOXA card exist? */
#define MOXA_LOAD_C320B       (MOXA + 11) /* download 320B firmware */
#define MOXA_LOAD_CODE        (MOXA + 12) /* download firmware */
#define MOXA_GETDATACOUNT       (MOXA + 23)
#define MOXA_GET_IOQUEUE      (MOXA + 27)
#define MOXA_FLUSH_QUEUE      (MOXA + 28)
#define MOXA_GET_CONF         (MOXA + 35) /* configuration */
#define MOXA_GET_MAJOR          (MOXA + 63)
#define MOXA_GET_CUMAJOR        (MOXA + 64)
#define MOXA_GETMSTATUS         (MOXA + 65)


struct moxaq_str {
      int inq;
      int outq;
};

struct dl_str {
      char __user *buf;
      int len;
      int cardno;
};

static struct moxaq_str temp_queue[MAX_PORTS];
static struct dl_str dltmp;

void MoxaPortFlushData(int port, int mode)
{
      void __iomem *ofsAddr;
      if ((mode < 0) || (mode > 2))
            return;
      ofsAddr = moxaTableAddr[port];
      moxafunc(ofsAddr, FC_FlushQueue, mode);
      if (mode != 1) {
            moxaLowChkFlag[port] = 0;
            low_water_check(ofsAddr);
      }
}

int MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port)
{
      int i;
      int status;
      int MoxaPortTxQueue(int), MoxaPortRxQueue(int);
      void __user *argp = (void __user *)arg;

      if (port == QueryPort) {
            if ((cmd != MOXA_GET_CONF) && (cmd != MOXA_INIT_DRIVER) &&
                (cmd != MOXA_LOAD_BIOS) && (cmd != MOXA_FIND_BOARD) && (cmd != MOXA_LOAD_C320B) &&
             (cmd != MOXA_LOAD_CODE) && (cmd != MOXA_GETDATACOUNT) &&
              (cmd != MOXA_GET_IOQUEUE) && (cmd != MOXA_GET_MAJOR) &&
                (cmd != MOXA_GET_CUMAJOR) && (cmd != MOXA_GETMSTATUS))
                  return (-EINVAL);
      }
      switch (cmd) {
      case MOXA_GET_CONF:
            if(copy_to_user(argp, &moxa_boards, MAX_BOARDS * sizeof(moxa_board_conf)))
                  return -EFAULT;
            return (0);
      case MOXA_INIT_DRIVER:
            if ((int) arg == 0x404)
                  MoxaDriverInit();
            return (0);
      case MOXA_GETDATACOUNT:
            moxaLog.tick = jiffies;
            if(copy_to_user(argp, &moxaLog, sizeof(mon_st)))
                  return -EFAULT;
            return (0);
      case MOXA_FLUSH_QUEUE:
            MoxaPortFlushData(port, arg);
            return (0);
      case MOXA_GET_IOQUEUE:
            for (i = 0; i < MAX_PORTS; i++) {
                  if (moxaChkPort[i]) {
                        temp_queue[i].inq = MoxaPortRxQueue(i);
                        temp_queue[i].outq = MoxaPortTxQueue(i);
                  }
            }
            if(copy_to_user(argp, temp_queue, sizeof(struct moxaq_str) * MAX_PORTS))
                  return -EFAULT;
            return (0);
      case MOXA_GET_OQUEUE:
            i = MoxaPortTxQueue(port);
            return put_user(i, (unsigned long __user *)argp);
      case MOXA_GET_IQUEUE:
            i = MoxaPortRxQueue(port);
            return put_user(i, (unsigned long __user *)argp);
      case MOXA_GET_MAJOR:
            if(copy_to_user(argp, &ttymajor, sizeof(int)))
                  return -EFAULT;
            return 0;
      case MOXA_GET_CUMAJOR:
            i = 0;
            if(copy_to_user(argp, &i, sizeof(int)))
                  return -EFAULT;
            return 0;
      case MOXA_GETMSTATUS:
            for (i = 0; i < MAX_PORTS; i++) {
                  GMStatus[i].ri = 0;
                  GMStatus[i].dcd = 0;
                  GMStatus[i].dsr = 0;
                  GMStatus[i].cts = 0;
                  if (!moxaChkPort[i]) {
                        continue;
                  } else {
                        status = MoxaPortLineStatus(moxaChannels[i].port);
                        if (status & 1)
                              GMStatus[i].cts = 1;
                        if (status & 2)
                              GMStatus[i].dsr = 1;
                        if (status & 4)
                              GMStatus[i].dcd = 1;
                  }

                  if (!moxaChannels[i].tty || !moxaChannels[i].tty->termios)
                        GMStatus[i].cflag = moxaChannels[i].cflag;
                  else
                        GMStatus[i].cflag = moxaChannels[i].tty->termios->c_cflag;
            }
            if(copy_to_user(argp, GMStatus, sizeof(struct mxser_mstatus) * MAX_PORTS))
                  return -EFAULT;
            return 0;
      default:
            return (-ENOIOCTLCMD);
      case MOXA_LOAD_BIOS:
      case MOXA_FIND_BOARD:
      case MOXA_LOAD_C320B:
      case MOXA_LOAD_CODE:
            if (!capable(CAP_SYS_RAWIO))
                  return -EPERM;
            break;
      }

      if(copy_from_user(&dltmp, argp, sizeof(struct dl_str)))
            return -EFAULT;
      if(dltmp.cardno < 0 || dltmp.cardno >= MAX_BOARDS)
            return -EINVAL;

      switch(cmd)
      {
      case MOXA_LOAD_BIOS:
            i = moxaloadbios(dltmp.cardno, dltmp.buf, dltmp.len);
            return (i);
      case MOXA_FIND_BOARD:
            return moxafindcard(dltmp.cardno);
      case MOXA_LOAD_C320B:
            moxaload320b(dltmp.cardno, dltmp.buf, dltmp.len);
      default: /* to keep gcc happy */
            return (0);
      case MOXA_LOAD_CODE:
            i = moxaloadcode(dltmp.cardno, dltmp.buf, dltmp.len);
            if (i == -1)
                  return (-EFAULT);
            return (i);

      }
}

int MoxaDriverPoll(void)
{
      register ushort temp;
      register int card;
      void __iomem *ofsAddr;
      void __iomem *ip;
      int port, p, ports;

      if (moxaCard == 0)
            return (-1);
      for (card = 0; card < MAX_BOARDS; card++) {
              if (loadstat[card] == 0)
                  continue;
            if ((ports = moxa_boards[card].numPorts) == 0)
                  continue;
            if (readb(moxaIntPend[card]) == 0xff) {
                  ip = moxaIntTable[card] + readb(moxaIntNdx[card]);
                  p = card * MAX_PORTS_PER_BOARD;
                  ports <<= 1;
                  for (port = 0; port < ports; port += 2, p++) {
                        if ((temp = readw(ip + port)) != 0) {
                              writew(0, ip + port);
                              ofsAddr = moxaTableAddr[p];
                              if (temp & IntrTx)
                                    writew(readw(ofsAddr + HostStat) & ~WakeupTx, ofsAddr + HostStat);
                              if (temp & IntrBreak) {
                                    moxaBreakCnt[p]++;
                              }
                              if (temp & IntrLine) {
                                    if (readb(ofsAddr + FlagStat) & DCD_state) {
                                          if ((moxaDCDState[p] & DCD_oldstate) == 0)
                                                moxaDCDState[p] = (DCD_oldstate |
                                                               DCD_changed);
                                    } else {
                                          if (moxaDCDState[p] & DCD_oldstate)
                                                moxaDCDState[p] = DCD_changed;
                                    }
                              }
                        }
                  }
                  writeb(0, moxaIntPend[card]);
            }
            if (moxaLowWaterChk) {
                  p = card * MAX_PORTS_PER_BOARD;
                  for (port = 0; port < ports; port++, p++) {
                        if (moxaLowChkFlag[p]) {
                              moxaLowChkFlag[p] = 0;
                              ofsAddr = moxaTableAddr[p];
                              low_water_check(ofsAddr);
                        }
                  }
            }
      }
      moxaLowWaterChk = 0;
      return (0);
}

/*****************************************************************************
 *    Card level function:                                       *
 *    1. MoxaPortsOfCard(int cardno);                            *
 *****************************************************************************/
int MoxaPortsOfCard(int cardno)
{

      if (moxa_boards[cardno].boardType == 0)
            return (0);
      return (moxa_boards[cardno].numPorts);
}

/*****************************************************************************
 *    Port level functions:                                      *
 *    1.  MoxaPortIsValid(int port);                                   *
 *    2.  MoxaPortEnable(int port);                              *
 *    3.  MoxaPortDisable(int port);                                   *
 *    4.  MoxaPortGetMaxBaud(int port);                          *
 *    5.  MoxaPortGetCurBaud(int port);                          *
 *    6.  MoxaPortSetBaud(int port, long baud);                  *
 *    7.  MoxaPortSetMode(int port, int databit, int stopbit, int parity); *
 *    8.  MoxaPortSetTermio(int port, unsigned char *termio);          *
 *    9.  MoxaPortGetLineOut(int port, int *dtrState, int *rtsState);      *
 *    10. MoxaPortLineCtrl(int port, int dtrState, int rtsState);      *
 *    11. MoxaPortFlowCtrl(int port, int rts, int cts, int rx, int tx,int xany);    *
 *    12. MoxaPortLineStatus(int port);                          *
 *    13. MoxaPortDCDChange(int port);                           *
 *    14. MoxaPortDCDON(int port);                               *
 *    15. MoxaPortFlushData(int port, int mode);                           *
 *    16. MoxaPortWriteData(int port, unsigned char * buffer, int length); *
 *    17. MoxaPortReadData(int port, struct tty_struct *tty);          *
 *    18. MoxaPortTxBufSize(int port);                           *
 *    19. MoxaPortRxBufSize(int port);                           *
 *    20. MoxaPortTxQueue(int port);                                   *
 *    21. MoxaPortTxFree(int port);                              *
 *    22. MoxaPortRxQueue(int port);                                   *
 *    23. MoxaPortRxFree(int port);                              *
 *    24. MoxaPortTxDisable(int port);                           *
 *    25. MoxaPortTxEnable(int port);                            *
 *    26. MoxaPortGetBrkCnt(int port);                           *
 *    27. MoxaPortResetBrkCnt(int port);                         *
 *    28. MoxaPortSetXonXoff(int port, int xonValue, int xoffValue);         *
 *    29. MoxaPortIsTxHold(int port);                            *
 *    30. MoxaPortSendBreak(int port, int ticks);                      *
 *****************************************************************************/
/*
 *    Moxa Port Number Description:
 *
 *      MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And,
 *      the port number using in MOXA driver functions will be 0 to 31 for
 *      first MOXA board, 32 to 63 for second, 64 to 95 for third and 96
 *      to 127 for fourth. For example, if you setup three MOXA boards,
 *      first board is C218, second board is C320-16 and third board is
 *      C320-32. The port number of first board (C218 - 8 ports) is from
 *      0 to 7. The port number of second board (C320 - 16 ports) is form
 *      32 to 47. The port number of third board (C320 - 32 ports) is from
 *      64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to
 *      127 will be invalid.
 *
 *
 *      Moxa Functions Description:
 *
 *      Function 1:     Driver initialization routine, this routine must be
 *                      called when initialized driver.
 *      Syntax:
 *      void MoxaDriverInit();
 *
 *
 *      Function 2:     Moxa driver private IOCTL command processing.
 *      Syntax:
 *      int  MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port);
 *
 *           unsigned int cmd   : IOCTL command
 *           unsigned long arg  : IOCTL argument
 *           int port           : port number (0 - 127)
 *
 *           return:    0  (OK)
 *                      -EINVAL
 *                      -ENOIOCTLCMD
 *
 *
 *      Function 3:     Moxa driver polling process routine.
 *      Syntax:
 *      int  MoxaDriverPoll(void);
 *
 *           return:    0       ; polling O.K.
 *                      -1      : no any Moxa card.             
 *
 *
 *      Function 4:     Get the ports of this card.
 *      Syntax:
 *      int  MoxaPortsOfCard(int cardno);
 *
 *           int cardno         : card number (0 - 3)
 *
 *           return:    0       : this card is invalid
 *                      8/16/24/32
 *
 *
 *      Function 5:     Check this port is valid or invalid
 *      Syntax:
 *      int  MoxaPortIsValid(int port);
 *           int port           : port number (0 - 127, ref port description)
 *
 *           return:    0       : this port is invalid
 *                      1       : this port is valid
 *
 *
 *      Function 6:     Enable this port to start Tx/Rx data.
 *      Syntax:
 *      void MoxaPortEnable(int port);
 *           int port           : port number (0 - 127)
 *
 *
 *      Function 7:     Disable this port
 *      Syntax:
 *      void MoxaPortDisable(int port);
 *           int port           : port number (0 - 127)
 *
 *
 *      Function 8:     Get the maximun available baud rate of this port.
 *      Syntax:
 *      long MoxaPortGetMaxBaud(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    0       : this port is invalid
 *                      38400/57600/115200 bps
 *
 *
 *      Function 9:     Get the current baud rate of this port.
 *      Syntax:
 *      long MoxaPortGetCurBaud(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    0       : this port is invalid
 *                      50 - 115200 bps
 *
 *
 *      Function 10:    Setting baud rate of this port.
 *      Syntax:
 *      long MoxaPortSetBaud(int port, long baud);
 *           int port           : port number (0 - 127)
 *           long baud          : baud rate (50 - 115200)
 *
 *           return:    0       : this port is invalid or baud < 50
 *                      50 - 115200 : the real baud rate set to the port, if
 *                                    the argument baud is large than maximun
 *                                    available baud rate, the real setting
 *                                    baud rate will be the maximun baud rate.
 *
 *
 *      Function 11:    Setting the data-bits/stop-bits/parity of this port
 *      Syntax:
 *      int  MoxaPortSetMode(int port, int databits, int stopbits, int parity);
 *           int port           : port number (0 - 127)
 *           int databits       : data bits (8/7/6/5)
 *           int stopbits       : stop bits (2/1/0, 0 show 1.5 stop bits)
 int parity     : parity (0:None,1:Odd,2:Even,3:Mark,4:Space)
 *
 *           return:    -1      : invalid parameter
 *                      0       : setting O.K.
 *
 *
 *      Function 12:    Configure the port.
 *      Syntax:
 *      int  MoxaPortSetTermio(int port, struct termios *termio);
 *           int port           : port number (0 - 127)
 *           struct termios * termio : termio structure pointer
 *
 *           return:    -1      : this port is invalid or termio == NULL
 *                      0       : setting O.K.
 *
 *
 *      Function 13:    Get the DTR/RTS state of this port.
 *      Syntax:
 *      int  MoxaPortGetLineOut(int port, int *dtrState, int *rtsState);
 *           int port           : port number (0 - 127)
 *           int * dtrState     : pointer to INT to receive the current DTR
 *                                state. (if NULL, this function will not
 *                                write to this address)
 *           int * rtsState     : pointer to INT to receive the current RTS
 *                                state. (if NULL, this function will not
 *                                write to this address)
 *
 *           return:    -1      : this port is invalid
 *                      0       : O.K.
 *
 *
 *      Function 14:    Setting the DTR/RTS output state of this port.
 *      Syntax:
 *      void MoxaPortLineCtrl(int port, int dtrState, int rtsState);
 *           int port           : port number (0 - 127)
 *           int dtrState       : DTR output state (0: off, 1: on)
 *           int rtsState       : RTS output state (0: off, 1: on)
 *
 *
 *      Function 15:    Setting the flow control of this port.
 *      Syntax:
 *      void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow,
 *                            int txFlow,int xany);
 *           int port           : port number (0 - 127)
 *           int rtsFlow        : H/W RTS flow control (0: no, 1: yes)
 *           int ctsFlow        : H/W CTS flow control (0: no, 1: yes)
 *           int rxFlow         : S/W Rx XON/XOFF flow control (0: no, 1: yes)
 *           int txFlow         : S/W Tx XON/XOFF flow control (0: no, 1: yes)
 *           int xany           : S/W XANY flow control (0: no, 1: yes)
 *
 *
 *      Function 16:    Get ths line status of this port
 *      Syntax:
 *      int  MoxaPortLineStatus(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    Bit 0 - CTS state (0: off, 1: on)
 *                      Bit 1 - DSR state (0: off, 1: on)
 *                      Bit 2 - DCD state (0: off, 1: on)
 *
 *
 *      Function 17:    Check the DCD state has changed since the last read
 *                      of this function.
 *      Syntax:
 *      int  MoxaPortDCDChange(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    0       : no changed
 *                      1       : DCD has changed
 *
 *
 *      Function 18:    Check ths current DCD state is ON or not.
 *      Syntax:
 *      int  MoxaPortDCDON(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    0       : DCD off
 *                      1       : DCD on
 *
 *
 *      Function 19:    Flush the Rx/Tx buffer data of this port.
 *      Syntax:
 *      void MoxaPortFlushData(int port, int mode);
 *           int port           : port number (0 - 127)
 *           int mode    
 *                      0       : flush the Rx buffer 
 *                      1       : flush the Tx buffer 
 *                      2       : flush the Rx and Tx buffer 
 *
 *
 *      Function 20:    Write data.
 *      Syntax:
 *      int  MoxaPortWriteData(int port, unsigned char * buffer, int length);
 *           int port           : port number (0 - 127)
 *           unsigned char * buffer     : pointer to write data buffer.
 *           int length         : write data length
 *
 *           return:    0 - length      : real write data length
 *
 *
 *      Function 21:    Read data.
 *      Syntax:
 *      int  MoxaPortReadData(int port, struct tty_struct *tty);
 *           int port           : port number (0 - 127)
 *         struct tty_struct *tty : tty for data
 *
 *           return:    0 - length      : real read data length
 *
 *
 *      Function 22:    Get the Tx buffer size of this port
 *      Syntax:
 *      int  MoxaPortTxBufSize(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    ..      : Tx buffer size
 *
 *
 *      Function 23:    Get the Rx buffer size of this port
 *      Syntax:
 *      int  MoxaPortRxBufSize(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    ..      : Rx buffer size
 *
 *
 *      Function 24:    Get the Tx buffer current queued data bytes
 *      Syntax:
 *      int  MoxaPortTxQueue(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    ..      : Tx buffer current queued data bytes
 *
 *
 *      Function 25:    Get the Tx buffer current free space
 *      Syntax:
 *      int  MoxaPortTxFree(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    ..      : Tx buffer current free space
 *
 *
 *      Function 26:    Get the Rx buffer current queued data bytes
 *      Syntax:
 *      int  MoxaPortRxQueue(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    ..      : Rx buffer current queued data bytes
 *
 *
 *      Function 27:    Get the Rx buffer current free space
 *      Syntax:
 *      int  MoxaPortRxFree(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    ..      : Rx buffer current free space
 *
 *
 *      Function 28:    Disable port data transmission.
 *      Syntax:
 *      void MoxaPortTxDisable(int port);
 *           int port           : port number (0 - 127)
 *
 *
 *      Function 29:    Enable port data transmission.
 *      Syntax:
 *      void MoxaPortTxEnable(int port);
 *           int port           : port number (0 - 127)
 *
 *
 *      Function 30:    Get the received BREAK signal count.
 *      Syntax:
 *      int  MoxaPortGetBrkCnt(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    0 - ..  : BREAK signal count
 *
 *
 *      Function 31:    Get the received BREAK signal count and reset it.
 *      Syntax:
 *      int  MoxaPortResetBrkCnt(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    0 - ..  : BREAK signal count
 *
 *
 *      Function 32:    Set the S/W flow control new XON/XOFF value, default
 *                      XON is 0x11 & XOFF is 0x13.
 *      Syntax:
 *      void MoxaPortSetXonXoff(int port, int xonValue, int xoffValue);
 *           int port           : port number (0 - 127)
 *           int xonValue       : new XON value (0 - 255)
 *           int xoffValue      : new XOFF value (0 - 255)
 *
 *
 *      Function 33:    Check this port's transmission is hold by remote site
 *                      because the flow control.
 *      Syntax:
 *      int  MoxaPortIsTxHold(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    0       : normal
 *                      1       : hold by remote site
 *
 *
 *      Function 34:    Send out a BREAK signal.
 *      Syntax:
 *      void MoxaPortSendBreak(int port, int ms100);
 *           int port           : port number (0 - 127)
 *           int ms100          : break signal time interval.
 *                                unit: 100 mini-second. if ms100 == 0, it will
 *                                send out a about 250 ms BREAK signal.
 *
 */
int MoxaPortIsValid(int port)
{

      if (moxaCard == 0)
            return (0);
      if (moxaChkPort[port] == 0)
            return (0);
      return (1);
}

void MoxaPortEnable(int port)
{
      void __iomem *ofsAddr;
      int MoxaPortLineStatus(int);
      short lowwater = 512;

      ofsAddr = moxaTableAddr[port];
      writew(lowwater, ofsAddr + Low_water);
      moxaBreakCnt[port] = 0;
      if ((moxa_boards[port / MAX_PORTS_PER_BOARD].boardType == MOXA_BOARD_C320_ISA) ||
          (moxa_boards[port / MAX_PORTS_PER_BOARD].boardType == MOXA_BOARD_C320_PCI)) {
            moxafunc(ofsAddr, FC_SetBreakIrq, 0);
      } else {
            writew(readw(ofsAddr + HostStat) | WakeupBreak, ofsAddr + HostStat);
      }

      moxafunc(ofsAddr, FC_SetLineIrq, Magic_code);
      moxafunc(ofsAddr, FC_FlushQueue, 2);

      moxafunc(ofsAddr, FC_EnableCH, Magic_code);
      MoxaPortLineStatus(port);
}

void MoxaPortDisable(int port)
{
      void __iomem *ofsAddr = moxaTableAddr[port];

      moxafunc(ofsAddr, FC_SetFlowCtl, 0);      /* disable flow control */
      moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code);
      writew(0, ofsAddr + HostStat);
      moxafunc(ofsAddr, FC_DisableCH, Magic_code);
}

long MoxaPortGetMaxBaud(int port)
{
      if ((moxa_boards[port / MAX_PORTS_PER_BOARD].boardType == MOXA_BOARD_C320_ISA) ||
          (moxa_boards[port / MAX_PORTS_PER_BOARD].boardType == MOXA_BOARD_C320_PCI))
            return (460800L);
      else
            return (921600L);
}


long MoxaPortSetBaud(int port, long baud)
{
      void __iomem *ofsAddr;
      long max, clock;
      unsigned int val;

      if ((baud < 50L) || ((max = MoxaPortGetMaxBaud(port)) == 0))
            return (0);
      ofsAddr = moxaTableAddr[port];
      if (baud > max)
            baud = max;
      if (max == 38400L)
            clock = 614400L;  /* for 9.8304 Mhz : max. 38400 bps */
      else if (max == 57600L)
            clock = 691200L;  /* for 11.0592 Mhz : max. 57600 bps */
      else
            clock = 921600L;  /* for 14.7456 Mhz : max. 115200 bps */
      val = clock / baud;
      moxafunc(ofsAddr, FC_SetBaud, val);
      baud = clock / val;
      moxaCurBaud[port] = baud;
      return (baud);
}

int MoxaPortSetTermio(int port, struct termios *termio)
{
      void __iomem *ofsAddr;
      tcflag_t cflag;
      long baud;
      tcflag_t mode = 0;

      if (moxaChkPort[port] == 0 || termio == 0)
            return (-1);
      ofsAddr = moxaTableAddr[port];
      cflag = termio->c_cflag;      /* termio->c_cflag */

      mode = termio->c_cflag & CSIZE;
      if (mode == CS5)
            mode = MX_CS5;
      else if (mode == CS6)
            mode = MX_CS6;
      else if (mode == CS7)
            mode = MX_CS7;
      else if (mode == CS8)
            mode = MX_CS8;

      if (termio->c_cflag & CSTOPB) {
            if (mode == MX_CS5)
                  mode |= MX_STOP15;
            else
                  mode |= MX_STOP2;
      } else
            mode |= MX_STOP1;

      if (termio->c_cflag & PARENB) {
            if (termio->c_cflag & PARODD)
                  mode |= MX_PARODD;
            else
                  mode |= MX_PAREVEN;
      } else
            mode |= MX_PARNONE;

      moxafunc(ofsAddr, FC_SetDataMode, (ushort) mode);

      cflag &= (CBAUD | CBAUDEX);
#ifndef B921600
#define     B921600     (B460800+1)
#endif
      switch (cflag) {
      case B921600:
            baud = 921600L;
            break;
      case B460800:
            baud = 460800L;
            break;
      case B230400:
            baud = 230400L;
            break;
      case B115200:
            baud = 115200L;
            break;
      case B57600:
            baud = 57600L;
            break;
      case B38400:
            baud = 38400L;
            break;
      case B19200:
            baud = 19200L;
            break;
      case B9600:
            baud = 9600L;
            break;
      case B4800:
            baud = 4800L;
            break;
      case B2400:
            baud = 2400L;
            break;
      case B1800:
            baud = 1800L;
            break;
      case B1200:
            baud = 1200L;
            break;
      case B600:
            baud = 600L;
            break;
      case B300:
            baud = 300L;
            break;
      case B200:
            baud = 200L;
            break;
      case B150:
            baud = 150L;
            break;
      case B134:
            baud = 134L;
            break;
      case B110:
            baud = 110L;
            break;
      case B75:
            baud = 75L;
            break;
      case B50:
            baud = 50L;
            break;
      default:
            baud = 0;
      }
      if ((moxa_boards[port / MAX_PORTS_PER_BOARD].boardType == MOXA_BOARD_C320_ISA) ||
          (moxa_boards[port / MAX_PORTS_PER_BOARD].boardType == MOXA_BOARD_C320_PCI)) {
            if (baud == 921600L)
                  return (-1);
      }
      MoxaPortSetBaud(port, baud);

      if (termio->c_iflag & (IXON | IXOFF | IXANY)) {
            writeb(termio->c_cc[VSTART], ofsAddr + FuncArg);
            writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1);
            writeb(FC_SetXonXoff, ofsAddr + FuncCode);
            wait_finish(ofsAddr);

      }
      return (0);
}

int MoxaPortGetLineOut(int port, int *dtrState, int *rtsState)
{

      if (!MoxaPortIsValid(port))
            return (-1);
      if (dtrState) {
            if (moxaLineCtrl[port] & DTR_ON)
                  *dtrState = 1;
            else
                  *dtrState = 0;
      }
      if (rtsState) {
            if (moxaLineCtrl[port] & RTS_ON)
                  *rtsState = 1;
            else
                  *rtsState = 0;
      }
      return (0);
}

void MoxaPortLineCtrl(int port, int dtr, int rts)
{
      void __iomem *ofsAddr;
      int mode;

      ofsAddr = moxaTableAddr[port];
      mode = 0;
      if (dtr)
            mode |= DTR_ON;
      if (rts)
            mode |= RTS_ON;
      moxaLineCtrl[port] = mode;
      moxafunc(ofsAddr, FC_LineControl, mode);
}

void MoxaPortFlowCtrl(int port, int rts, int cts, int txflow, int rxflow, int txany)
{
      void __iomem *ofsAddr;
      int mode;

      ofsAddr = moxaTableAddr[port];
      mode = 0;
      if (rts)
            mode |= RTS_FlowCtl;
      if (cts)
            mode |= CTS_FlowCtl;
      if (txflow)
            mode |= Tx_FlowCtl;
      if (rxflow)
            mode |= Rx_FlowCtl;
      if (txany)
            mode |= IXM_IXANY;
      moxafunc(ofsAddr, FC_SetFlowCtl, mode);
}

int MoxaPortLineStatus(int port)
{
      void __iomem *ofsAddr;
      int val;

      ofsAddr = moxaTableAddr[port];
      if ((moxa_boards[port / MAX_PORTS_PER_BOARD].boardType == MOXA_BOARD_C320_ISA) ||
          (moxa_boards[port / MAX_PORTS_PER_BOARD].boardType == MOXA_BOARD_C320_PCI)) {
            moxafunc(ofsAddr, FC_LineStatus, 0);
            val = readw(ofsAddr + FuncArg);
      } else {
            val = readw(ofsAddr + FlagStat) >> 4;
      }
      val &= 0x0B;
      if (val & 8) {
            val |= 4;
            if ((moxaDCDState[port] & DCD_oldstate) == 0)
                  moxaDCDState[port] = (DCD_oldstate | DCD_changed);
      } else {
            if (moxaDCDState[port] & DCD_oldstate)
                  moxaDCDState[port] = DCD_changed;
      }
      val &= 7;
      return (val);
}

int MoxaPortDCDChange(int port)
{
      int n;

      if (moxaChkPort[port] == 0)
            return (0);
      n = moxaDCDState[port];
      moxaDCDState[port] &= ~DCD_changed;
      n &= DCD_changed;
      return (n);
}

int MoxaPortDCDON(int port)
{
      int n;

      if (moxaChkPort[port] == 0)
            return (0);
      if (moxaDCDState[port] & DCD_oldstate)
            n = 1;
      else
            n = 0;
      return (n);
}


/*
   int MoxaDumpMem(int port, unsigned char * buffer, int len)
   {
   int          i;
   unsigned long                baseAddr,ofsAddr,ofs;

   baseAddr = moxaBaseAddr[port / MAX_PORTS_PER_BOARD];
   ofs = baseAddr + DynPage_addr + pageofs;
   if (len > 0x2000L)
   len = 0x2000L;
   for (i = 0; i < len; i++)
   buffer[i] = readb(ofs+i);
   }
 */


int MoxaPortWriteData(int port, unsigned char * buffer, int len)
{
      int c, total, i;
      ushort tail;
      int cnt;
      ushort head, tx_mask, spage, epage;
      ushort pageno, pageofs, bufhead;
      void __iomem *baseAddr, *ofsAddr, *ofs;

      ofsAddr = moxaTableAddr[port];
      baseAddr = moxaBaseAddr[port / MAX_PORTS_PER_BOARD];
      tx_mask = readw(ofsAddr + TX_mask);
      spage = readw(ofsAddr + Page_txb);
      epage = readw(ofsAddr + EndPage_txb);
      tail = readw(ofsAddr + TXwptr);
      head = readw(ofsAddr + TXrptr);
      c = (head > tail) ? (head - tail - 1)
          : (head - tail + tx_mask);
      if (c > len)
            c = len;
      moxaLog.txcnt[port] += c;
      total = c;
      if (spage == epage) {
            bufhead = readw(ofsAddr + Ofs_txb);
            writew(spage, baseAddr + Control_reg);
            while (c > 0) {
                  if (head > tail)
                        len = head - tail - 1;
                  else
                        len = tx_mask + 1 - tail;
                  len = (c > len) ? len : c;
                  ofs = baseAddr + DynPage_addr + bufhead + tail;
                  for (i = 0; i < len; i++)
                        writeb(*buffer++, ofs + i);
                  tail = (tail + len) & tx_mask;
                  c -= len;
            }
            writew(tail, ofsAddr + TXwptr);
      } else {
            len = c;
            pageno = spage + (tail >> 13);
            pageofs = tail & Page_mask;
            do {
                  cnt = Page_size - pageofs;
                  if (cnt > c)
                        cnt = c;
                  c -= cnt;
                  writeb(pageno, baseAddr + Control_reg);
                  ofs = baseAddr + DynPage_addr + pageofs;
                  for (i = 0; i < cnt; i++)
                        writeb(*buffer++, ofs + i);
                  if (c == 0) {
                        writew((tail + len) & tx_mask, ofsAddr + TXwptr);
                        break;
                  }
                  if (++pageno == epage)
                        pageno = spage;
                  pageofs = 0;
            } while (1);
      }
      writeb(1, ofsAddr + CD180TXirq);    /* start to send */
      return (total);
}

int MoxaPortReadData(int port, struct tty_struct *tty)
{
      register ushort head, pageofs;
      int i, count, cnt, len, total, remain;
      ushort tail, rx_mask, spage, epage;
      ushort pageno, bufhead;
      void __iomem *baseAddr, *ofsAddr, *ofs;

      ofsAddr = moxaTableAddr[port];
      baseAddr = moxaBaseAddr[port / MAX_PORTS_PER_BOARD];
      head = readw(ofsAddr + RXrptr);
      tail = readw(ofsAddr + RXwptr);
      rx_mask = readw(ofsAddr + RX_mask);
      spage = readw(ofsAddr + Page_rxb);
      epage = readw(ofsAddr + EndPage_rxb);
      count = (tail >= head) ? (tail - head)
          : (tail - head + rx_mask + 1);
      if (count == 0)
            return 0;

      total = count;
      remain = count - total;
      moxaLog.rxcnt[port] += total;
      count = total;
      if (spage == epage) {
            bufhead = readw(ofsAddr + Ofs_rxb);
            writew(spage, baseAddr + Control_reg);
            while (count > 0) {
                  if (tail >= head)
                        len = tail - head;
                  else
                        len = rx_mask + 1 - head;
                  len = (count > len) ? len : count;
                  ofs = baseAddr + DynPage_addr + bufhead + head;
                  for (i = 0; i < len; i++)
                        tty_insert_flip_char(tty, readb(ofs + i), TTY_NORMAL);
                  head = (head + len) & rx_mask;
                  count -= len;
            }
            writew(head, ofsAddr + RXrptr);
      } else {
            len = count;
            pageno = spage + (head >> 13);
            pageofs = head & Page_mask;
            do {
                  cnt = Page_size - pageofs;
                  if (cnt > count)
                        cnt = count;
                  count -= cnt;
                  writew(pageno, baseAddr + Control_reg);
                  ofs = baseAddr + DynPage_addr + pageofs;
                  for (i = 0; i < cnt; i++)
                        tty_insert_flip_char(tty, readb(ofs + i), TTY_NORMAL);
                  if (count == 0) {
                        writew((head + len) & rx_mask, ofsAddr + RXrptr);
                        break;
                  }
                  if (++pageno == epage)
                        pageno = spage;
                  pageofs = 0;
            } while (1);
      }
      if ((readb(ofsAddr + FlagStat) & Xoff_state) && (remain < LowWater)) {
            moxaLowWaterChk = 1;
            moxaLowChkFlag[port] = 1;
      }
      return (total);
}


int MoxaPortTxQueue(int port)
{
      void __iomem *ofsAddr;
      ushort rptr, wptr, mask;
      int len;

      ofsAddr = moxaTableAddr[port];
      rptr = readw(ofsAddr + TXrptr);
      wptr = readw(ofsAddr + TXwptr);
      mask = readw(ofsAddr + TX_mask);
      len = (wptr - rptr) & mask;
      return (len);
}

int MoxaPortTxFree(int port)
{
      void __iomem *ofsAddr;
      ushort rptr, wptr, mask;
      int len;

      ofsAddr = moxaTableAddr[port];
      rptr = readw(ofsAddr + TXrptr);
      wptr = readw(ofsAddr + TXwptr);
      mask = readw(ofsAddr + TX_mask);
      len = mask - ((wptr - rptr) & mask);
      return (len);
}

int MoxaPortRxQueue(int port)
{
      void __iomem *ofsAddr;
      ushort rptr, wptr, mask;
      int len;

      ofsAddr = moxaTableAddr[port];
      rptr = readw(ofsAddr + RXrptr);
      wptr = readw(ofsAddr + RXwptr);
      mask = readw(ofsAddr + RX_mask);
      len = (wptr - rptr) & mask;
      return (len);
}


void MoxaPortTxDisable(int port)
{
      void __iomem *ofsAddr;

      ofsAddr = moxaTableAddr[port];
      moxafunc(ofsAddr, FC_SetXoffState, Magic_code);
}

void MoxaPortTxEnable(int port)
{
      void __iomem *ofsAddr;

      ofsAddr = moxaTableAddr[port];
      moxafunc(ofsAddr, FC_SetXonState, Magic_code);
}


int MoxaPortResetBrkCnt(int port)
{
      ushort cnt;
      cnt = moxaBreakCnt[port];
      moxaBreakCnt[port] = 0;
      return (cnt);
}


void MoxaPortSendBreak(int port, int ms100)
{
      void __iomem *ofsAddr;

      ofsAddr = moxaTableAddr[port];
      if (ms100) {
            moxafunc(ofsAddr, FC_SendBreak, Magic_code);
            moxadelay(ms100 * (HZ / 10));
      } else {
            moxafunc(ofsAddr, FC_SendBreak, Magic_code);
            moxadelay(HZ / 4);      /* 250 ms */
      }
      moxafunc(ofsAddr, FC_StopBreak, Magic_code);
}

static int moxa_get_serial_info(struct moxa_str *info,
                        struct serial_struct __user *retinfo)
{
      struct serial_struct tmp;

      memset(&tmp, 0, sizeof(tmp));
      tmp.type = info->type;
      tmp.line = info->port;
      tmp.port = 0;
      tmp.irq = 0;
      tmp.flags = info->asyncflags;
      tmp.baud_base = 921600;
      tmp.close_delay = info->close_delay;
      tmp.closing_wait = info->closing_wait;
      tmp.custom_divisor = 0;
      tmp.hub6 = 0;
      if(copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
            return -EFAULT;
      return (0);
}


static int moxa_set_serial_info(struct moxa_str *info,
                        struct serial_struct __user *new_info)
{
      struct serial_struct new_serial;

      if(copy_from_user(&new_serial, new_info, sizeof(new_serial)))
            return -EFAULT;

      if ((new_serial.irq != 0) ||
          (new_serial.port != 0) ||
//           (new_serial.type != info->type) ||
          (new_serial.custom_divisor != 0) ||
          (new_serial.baud_base != 921600))
            return (-EPERM);

      if (!capable(CAP_SYS_ADMIN)) {
            if (((new_serial.flags & ~ASYNC_USR_MASK) !=
                 (info->asyncflags & ~ASYNC_USR_MASK)))
                  return (-EPERM);
      } else {
            info->close_delay = new_serial.close_delay * HZ / 100;
            info->closing_wait = new_serial.closing_wait * HZ / 100;
      }

      new_serial.flags = (new_serial.flags & ~ASYNC_FLAGS);
      new_serial.flags |= (info->asyncflags & ASYNC_FLAGS);

      if (new_serial.type == PORT_16550A) {
            MoxaSetFifo(info->port, 1);
      } else {
            MoxaSetFifo(info->port, 0);
      }

      info->type = new_serial.type;
      return (0);
}



/*****************************************************************************
 *    Static local functions:                                    *
 *****************************************************************************/
/*
 * moxadelay - delays a specified number ticks
 */
static void moxadelay(int tick)
{
      unsigned long st, et;

      st = jiffies;
      et = st + tick;
      while (time_before(jiffies, et));
}

static void moxafunc(void __iomem *ofsAddr, int cmd, ushort arg)
{

      writew(arg, ofsAddr + FuncArg);
      writew(cmd, ofsAddr + FuncCode);
      wait_finish(ofsAddr);
}

static void wait_finish(void __iomem *ofsAddr)
{
      unsigned long i, j;

      i = jiffies;
      while (readw(ofsAddr + FuncCode) != 0) {
            j = jiffies;
            if ((j - i) > moxaFuncTout) {
                  return;
            }
      }
}

static void low_water_check(void __iomem *ofsAddr)
{
      int len;
      ushort rptr, wptr, mask;

      if (readb(ofsAddr + FlagStat) & Xoff_state) {
            rptr = readw(ofsAddr + RXrptr);
            wptr = readw(ofsAddr + RXwptr);
            mask = readw(ofsAddr + RX_mask);
            len = (wptr - rptr) & mask;
            if (len <= Low_water)
                  moxafunc(ofsAddr, FC_SendXon, 0);
      }
}

static int moxaloadbios(int cardno, unsigned char __user *tmp, int len)
{
      void __iomem *baseAddr;
      int i;

      if(copy_from_user(moxaBuff, tmp, len))
            return -EFAULT;
      baseAddr = moxaBaseAddr[cardno];
      writeb(HW_reset, baseAddr + Control_reg); /* reset */
      moxadelay(1);           /* delay 10 ms */
      for (i = 0; i < 4096; i++)
            writeb(0, baseAddr + i);      /* clear fix page */
      for (i = 0; i < len; i++)
            writeb(moxaBuff[i], baseAddr + i);  /* download BIOS */
      writeb(0, baseAddr + Control_reg);  /* restart */
      return (0);
}

static int moxafindcard(int cardno)
{
      void __iomem *baseAddr;
      ushort tmp;

      baseAddr = moxaBaseAddr[cardno];
      switch (moxa_boards[cardno].boardType) {
      case MOXA_BOARD_C218_ISA:
      case MOXA_BOARD_C218_PCI:
            if ((tmp = readw(baseAddr + C218_key)) != C218_KeyCode) {
                  return (-1);
            }
            break;
      case MOXA_BOARD_CP204J:
            if ((tmp = readw(baseAddr + C218_key)) != CP204J_KeyCode) {
                  return (-1);
            }
            break;
      default:
            if ((tmp = readw(baseAddr + C320_key)) != C320_KeyCode) {
                  return (-1);
            }
            if ((tmp = readw(baseAddr + C320_status)) != STS_init) {
                  return (-2);
            }
      }
      return (0);
}

static int moxaload320b(int cardno, unsigned char __user *tmp, int len)
{
      void __iomem *baseAddr;
      int i;

      if(len > sizeof(moxaBuff))
            return -EINVAL;
      if(copy_from_user(moxaBuff, tmp, len))
            return -EFAULT;
      baseAddr = moxaBaseAddr[cardno];
      writew(len - 7168 - 2, baseAddr + C320bapi_len);
      writeb(1, baseAddr + Control_reg);  /* Select Page 1 */
      for (i = 0; i < 7168; i++)
            writeb(moxaBuff[i], baseAddr + DynPage_addr + i);
      writeb(2, baseAddr + Control_reg);  /* Select Page 2 */
      for (i = 0; i < (len - 7168); i++)
            writeb(moxaBuff[i + 7168], baseAddr + DynPage_addr + i);
      return (0);
}

static int moxaloadcode(int cardno, unsigned char __user *tmp, int len)
{
      void __iomem *baseAddr, *ofsAddr;
      int retval, port, i;

      if(copy_from_user(moxaBuff, tmp, len))
            return -EFAULT;
      baseAddr = moxaBaseAddr[cardno];
      switch (moxa_boards[cardno].boardType) {
      case MOXA_BOARD_C218_ISA:
      case MOXA_BOARD_C218_PCI:
      case MOXA_BOARD_CP204J:
            retval = moxaloadc218(cardno, baseAddr, len);
            if (retval)
                  return (retval);
            port = cardno * MAX_PORTS_PER_BOARD;
            for (i = 0; i < moxa_boards[cardno].numPorts; i++, port++) {
                  moxaChkPort[port] = 1;
                  moxaCurBaud[port] = 9600L;
                  moxaDCDState[port] = 0;
                  moxaTableAddr[port] = baseAddr + Extern_table + Extern_size * i;
                  ofsAddr = moxaTableAddr[port];
                  writew(C218rx_mask, ofsAddr + RX_mask);
                  writew(C218tx_mask, ofsAddr + TX_mask);
                  writew(C218rx_spage + i * C218buf_pageno, ofsAddr + Page_rxb);
                  writew(readw(ofsAddr + Page_rxb) + C218rx_pageno, ofsAddr + EndPage_rxb);

                  writew(C218tx_spage + i * C218buf_pageno, ofsAddr + Page_txb);
                  writew(readw(ofsAddr + Page_txb) + C218tx_pageno, ofsAddr + EndPage_txb);

            }
            break;
      default:
            retval = moxaloadc320(cardno, baseAddr, len,
                              &moxa_boards[cardno].numPorts);
            if (retval)
                  return (retval);
            port = cardno * MAX_PORTS_PER_BOARD;
            for (i = 0; i < moxa_boards[cardno].numPorts; i++, port++) {
                  moxaChkPort[port] = 1;
                  moxaCurBaud[port] = 9600L;
                  moxaDCDState[port] = 0;
                  moxaTableAddr[port] = baseAddr + Extern_table + Extern_size * i;
                  ofsAddr = moxaTableAddr[port];
                  if (moxa_boards[cardno].numPorts == 8) {
                        writew(C320p8rx_mask, ofsAddr + RX_mask);
                        writew(C320p8tx_mask, ofsAddr + TX_mask);
                        writew(C320p8rx_spage + i * C320p8buf_pgno, ofsAddr + Page_rxb);
                        writew(readw(ofsAddr + Page_rxb) + C320p8rx_pgno, ofsAddr + EndPage_rxb);
                        writew(C320p8tx_spage + i * C320p8buf_pgno, ofsAddr + Page_txb);
                        writew(readw(ofsAddr + Page_txb) + C320p8tx_pgno, ofsAddr + EndPage_txb);

                  } else if (moxa_boards[cardno].numPorts == 16) {
                        writew(C320p16rx_mask, ofsAddr + RX_mask);
                        writew(C320p16tx_mask, ofsAddr + TX_mask);
                        writew(C320p16rx_spage + i * C320p16buf_pgno, ofsAddr + Page_rxb);
                        writew(readw(ofsAddr + Page_rxb) + C320p16rx_pgno, ofsAddr + EndPage_rxb);
                        writew(C320p16tx_spage + i * C320p16buf_pgno, ofsAddr + Page_txb);
                        writew(readw(ofsAddr + Page_txb) + C320p16tx_pgno, ofsAddr + EndPage_txb);

                  } else if (moxa_boards[cardno].numPorts == 24) {
                        writew(C320p24rx_mask, ofsAddr + RX_mask);
                        writew(C320p24tx_mask, ofsAddr + TX_mask);
                        writew(C320p24rx_spage + i * C320p24buf_pgno, ofsAddr + Page_rxb);
                        writew(readw(ofsAddr + Page_rxb) + C320p24rx_pgno, ofsAddr + EndPage_rxb);
                        writew(C320p24tx_spage + i * C320p24buf_pgno, ofsAddr + Page_txb);
                        writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
                  } else if (moxa_boards[cardno].numPorts == 32) {
                        writew(C320p32rx_mask, ofsAddr + RX_mask);
                        writew(C320p32tx_mask, ofsAddr + TX_mask);
                        writew(C320p32tx_ofs, ofsAddr + Ofs_txb);
                        writew(C320p32rx_spage + i * C320p32buf_pgno, ofsAddr + Page_rxb);
                        writew(readb(ofsAddr + Page_rxb), ofsAddr + EndPage_rxb);
                        writew(C320p32tx_spage + i * C320p32buf_pgno, ofsAddr + Page_txb);
                        writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
                  }
            }
            break;
      }
      loadstat[cardno] = 1;
      return (0);
}

static int moxaloadc218(int cardno, void __iomem *baseAddr, int len)
{
      char retry;
      int i, j, len1, len2;
      ushort usum, *ptr, keycode;

      if (moxa_boards[cardno].boardType == MOXA_BOARD_CP204J)
            keycode = CP204J_KeyCode;
      else
            keycode = C218_KeyCode;
      usum = 0;
      len1 = len >> 1;
      ptr = (ushort *) moxaBuff;
      for (i = 0; i < len1; i++)
            usum += le16_to_cpu(*(ptr + i));
      retry = 0;
      do {
            len1 = len >> 1;
            j = 0;
            while (len1) {
                  len2 = (len1 > 2048) ? 2048 : len1;
                  len1 -= len2;
                  for (i = 0; i < len2 << 1; i++)
                        writeb(moxaBuff[i + j], baseAddr + C218_LoadBuf + i);
                  j += i;

                  writew(len2, baseAddr + C218DLoad_len);
                  writew(0, baseAddr + C218_key);
                  for (i = 0; i < 100; i++) {
                        if (readw(baseAddr + C218_key) == keycode)
                              break;
                        moxadelay(1);     /* delay 10 ms */
                  }
                  if (readw(baseAddr + C218_key) != keycode) {
                        return (-1);
                  }
            }
            writew(0, baseAddr + C218DLoad_len);
            writew(usum, baseAddr + C218check_sum);
            writew(0, baseAddr + C218_key);
            for (i = 0; i < 100; i++) {
                  if (readw(baseAddr + C218_key) == keycode)
                        break;
                  moxadelay(1);     /* delay 10 ms */
            }
            retry++;
      } while ((readb(baseAddr + C218chksum_ok) != 1) && (retry < 3));
      if (readb(baseAddr + C218chksum_ok) != 1) {
            return (-1);
      }
      writew(0, baseAddr + C218_key);
      for (i = 0; i < 100; i++) {
            if (readw(baseAddr + Magic_no) == Magic_code)
                  break;
            moxadelay(1);     /* delay 10 ms */
      }
      if (readw(baseAddr + Magic_no) != Magic_code) {
            return (-1);
      }
      writew(1, baseAddr + Disable_IRQ);
      writew(0, baseAddr + Magic_no);
      for (i = 0; i < 100; i++) {
            if (readw(baseAddr + Magic_no) == Magic_code)
                  break;
            moxadelay(1);     /* delay 10 ms */
      }
      if (readw(baseAddr + Magic_no) != Magic_code) {
            return (-1);
      }
      moxaCard = 1;
      moxaIntNdx[cardno] = baseAddr + IRQindex;
      moxaIntPend[cardno] = baseAddr + IRQpending;
      moxaIntTable[cardno] = baseAddr + IRQtable;
      return (0);
}

static int moxaloadc320(int cardno, void __iomem *baseAddr, int len, int *numPorts)
{
      ushort usum;
      int i, j, wlen, len2, retry;
      ushort *uptr;

      usum = 0;
      wlen = len >> 1;
      uptr = (ushort *) moxaBuff;
      for (i = 0; i < wlen; i++)
            usum += le16_to_cpu(uptr[i]);
      retry = 0;
      j = 0;
      do {
            while (wlen) {
                  if (wlen > 2048)
                        len2 = 2048;
                  else
                        len2 = wlen;
                  wlen -= len2;
                  len2 <<= 1;
                  for (i = 0; i < len2; i++)
                        writeb(moxaBuff[j + i], baseAddr + C320_LoadBuf + i);
                  len2 >>= 1;
                  j += i;
                  writew(len2, baseAddr + C320DLoad_len);
                  writew(0, baseAddr + C320_key);
                  for (i = 0; i < 10; i++) {
                        if (readw(baseAddr + C320_key) == C320_KeyCode)
                              break;
                        moxadelay(1);
                  }
                  if (readw(baseAddr + C320_key) != C320_KeyCode)
                        return (-1);
            }
            writew(0, baseAddr + C320DLoad_len);
            writew(usum, baseAddr + C320check_sum);
            writew(0, baseAddr + C320_key);
            for (i = 0; i < 10; i++) {
                  if (readw(baseAddr + C320_key) == C320_KeyCode)
                        break;
                  moxadelay(1);
            }
            retry++;
      } while ((readb(baseAddr + C320chksum_ok) != 1) && (retry < 3));
      if (readb(baseAddr + C320chksum_ok) != 1)
            return (-1);
      writew(0, baseAddr + C320_key);
      for (i = 0; i < 600; i++) {
            if (readw(baseAddr + Magic_no) == Magic_code)
                  break;
            moxadelay(1);
      }
      if (readw(baseAddr + Magic_no) != Magic_code)
            return (-100);

      if (moxa_boards[cardno].busType == MOXA_BUS_TYPE_PCI) {           /* ASIC board */
            writew(0x3800, baseAddr + TMS320_PORT1);
            writew(0x3900, baseAddr + TMS320_PORT2);
            writew(28499, baseAddr + TMS320_CLOCK);
      } else {
            writew(0x3200, baseAddr + TMS320_PORT1);
            writew(0x3400, baseAddr + TMS320_PORT2);
            writew(19999, baseAddr + TMS320_CLOCK);
      }
      writew(1, baseAddr + Disable_IRQ);
      writew(0, baseAddr + Magic_no);
      for (i = 0; i < 500; i++) {
            if (readw(baseAddr + Magic_no) == Magic_code)
                  break;
            moxadelay(1);
      }
      if (readw(baseAddr + Magic_no) != Magic_code)
            return (-102);

      j = readw(baseAddr + Module_cnt);
      if (j <= 0)
            return (-101);
      *numPorts = j * 8;
      writew(j, baseAddr + Module_no);
      writew(0, baseAddr + Magic_no);
      for (i = 0; i < 600; i++) {
            if (readw(baseAddr + Magic_no) == Magic_code)
                  break;
            moxadelay(1);
      }
      if (readw(baseAddr + Magic_no) != Magic_code)
            return (-102);
      moxaCard = 1;
      moxaIntNdx[cardno] = baseAddr + IRQindex;
      moxaIntPend[cardno] = baseAddr + IRQpending;
      moxaIntTable[cardno] = baseAddr + IRQtable;
      return (0);
}

#if 0
long MoxaPortGetCurBaud(int port)
{

      if (moxaChkPort[port] == 0)
            return (0);
      return (moxaCurBaud[port]);
}
#endif  /*  0  */

static void MoxaSetFifo(int port, int enable)
{
      void __iomem *ofsAddr = moxaTableAddr[port];

      if (!enable) {
            moxafunc(ofsAddr, FC_SetRxFIFOTrig, 0);
            moxafunc(ofsAddr, FC_SetTxFIFOCnt, 1);
      } else {
            moxafunc(ofsAddr, FC_SetRxFIFOTrig, 3);
            moxafunc(ofsAddr, FC_SetTxFIFOCnt, 16);
      }
}

#if 0
int MoxaPortSetMode(int port, int databits, int stopbits, int parity)
{
      void __iomem *ofsAddr;
      int val;

      val = 0;
      switch (databits) {
      case 5:
            val |= 0;
            break;
      case 6:
            val |= 1;
            break;
      case 7:
            val |= 2;
            break;
      case 8:
            val |= 3;
            break;
      default:
            return (-1);
      }
      switch (stopbits) {
      case 0:
            val |= 0;
            break;            /* stop bits 1.5 */
      case 1:
            val |= 0;
            break;
      case 2:
            val |= 4;
            break;
      default:
            return (-1);
      }
      switch (parity) {
      case 0:
            val |= 0x00;
            break;            /* None  */
      case 1:
            val |= 0x08;
            break;            /* Odd   */
      case 2:
            val |= 0x18;
            break;            /* Even  */
      case 3:
            val |= 0x28;
            break;            /* Mark  */
      case 4:
            val |= 0x38;
            break;            /* Space */
      default:
            return (-1);
      }
      ofsAddr = moxaTableAddr[port];
      moxafunc(ofsAddr, FC_SetMode, val);
      return (0);
}

int MoxaPortTxBufSize(int port)
{
      void __iomem *ofsAddr;
      int size;

      ofsAddr = moxaTableAddr[port];
      size = readw(ofsAddr + TX_mask);
      return (size);
}

int MoxaPortRxBufSize(int port)
{
      void __iomem *ofsAddr;
      int size;

      ofsAddr = moxaTableAddr[port];
      size = readw(ofsAddr + RX_mask);
      return (size);
}

int MoxaPortRxFree(int port)
{
      void __iomem *ofsAddr;
      ushort rptr, wptr, mask;
      int len;

      ofsAddr = moxaTableAddr[port];
      rptr = readw(ofsAddr + RXrptr);
      wptr = readw(ofsAddr + RXwptr);
      mask = readw(ofsAddr + RX_mask);
      len = mask - ((wptr - rptr) & mask);
      return (len);
}
int MoxaPortGetBrkCnt(int port)
{
      return (moxaBreakCnt[port]);
}

void MoxaPortSetXonXoff(int port, int xonValue, int xoffValue)
{
      void __iomem *ofsAddr;

      ofsAddr = moxaTableAddr[port];
      writew(xonValue, ofsAddr + FuncArg);
      writew(xoffValue, ofsAddr + FuncArg1);
      writew(FC_SetXonXoff, ofsAddr + FuncCode);
      wait_finish(ofsAddr);
}

int MoxaPortIsTxHold(int port)
{
      void __iomem *ofsAddr;
      int val;

      ofsAddr = moxaTableAddr[port];
      if ((moxa_boards[port / MAX_PORTS_PER_BOARD].boardType == MOXA_BOARD_C320_ISA) ||
          (moxa_boards[port / MAX_PORTS_PER_BOARD].boardType == MOXA_BOARD_C320_PCI)) {
            moxafunc(ofsAddr, FC_GetCCSR, 0);
            val = readw(ofsAddr + FuncArg);
            if (val & 0x04)
                  return (1);
      } else {
            if (readw(ofsAddr + FlagStat) & Tx_flowOff)
                  return (1);
      }
      return (0);
}
#endif

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