/*****************************************************************************/
/*
 *           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/config.h>
#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];

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, unsigned char *, int);
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,
};

#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 = "ttya";
        moxaDriver->devfs_name = "tts/a";
        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 = (sizeof(moxa_pcibrds) / sizeof(moxa_pcibrds[0])) - 1;
                i = 0;
                while (i < n) {
                        while ((p = pci_find_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;
        save_flags(flags);
        cli();
        len = MoxaPortWriteData(port, (unsigned char *) buf, count);
        restore_flags(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;
        save_flags(flags);
        cli();
        moxaXmitBuff[0] = c;
        MoxaPortWriteData(port, moxaXmitBuff, 1);
        restore_flags(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
        save_flags(flags);
        cli();
        if (!tty_hung_up_p(filp))
                ch->count--;
        restore_flags(flags);
        ch->blocked_open++;
        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);
        if (!tty_hung_up_p(filp))
                ch->count++;
        ch->blocked_open--;
#ifdef SERIAL_DEBUG_OPEN
        printk("block_til_ready after blocking: ttys%d, count = %d\n",
               ch->line, ch->count);
#endif
        if (retval)
                return (retval);
        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;

        save_flags(flags);
        cli();
        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]);
        restore_flags(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;
        int i, count, rc, space;
        unsigned char *charptr, *flagptr;
        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;
        }
        space = TTY_FLIPBUF_SIZE - tp->flip.count;
        if (space <= 0)
                return;
        charptr = tp->flip.char_buf_ptr;
        flagptr = tp->flip.flag_buf_ptr;
        rc = tp->flip.count;
        save_flags(flags);
        cli();
        count = MoxaPortReadData(ch->port, charptr, space);
        restore_flags(flags);
        for (i = 0; i < count; i++)
                *flagptr++ = 0;
        charptr += count;
        rc += count;
        tp->flip.count = rc;
        tp->flip.char_buf_ptr = charptr;
        tp->flip.flag_buf_ptr = flagptr;
        tty_schedule_flip(ch->tty);
}

#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:
                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 ((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, unsigned char * buffer, int length);  *
 *      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, unsigned char * buffer, int length);
 *           int port           : port number (0 - 127)
 *           unsigned char * buffer     : pointer to read data buffer.
 *           int length         : read data buffer length
 *
 *           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, unsigned char * buffer, int space)
{
        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 = (space > count) ? count : space;
        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++)
                                *buffer++ = readb(ofs + i);
                        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++)
                                *buffer++ = readb(ofs + i);
                        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;
        }
        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 += *(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;