mxser.c 82.9 KB
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/*
 *          mxser.c  -- MOXA Smartio/Industio family multiport serial driver.
 *
 *      Copyright (C) 1999-2001  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
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 *      (at your option) any later version.
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 *
 *      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.
 *
 *	Original release	10/26/00
 *
 *	02/06/01	Support MOXA Industio family boards.
 *	02/06/01	Support TIOCGICOUNT.
 *	02/06/01	Fix the problem for connecting to serial mouse.
 *	02/06/01	Fix the problem for H/W flow control.
 *	02/06/01	Fix the compling warning when CONFIG_PCI
 *			don't be defined.
 *
 *	Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
 *	<alan@redhat.com>. The original 1.8 code is available on www.moxa.com.
 *	- Fixed x86_64 cleanness
 *	- Fixed sleep with spinlock held in mxser_send_break
 */


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

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

#include "mxser.h"

#define	MXSER_VERSION	"1.8"
#define	MXSERMAJOR	 174
#define	MXSERCUMAJOR	 175

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#define	MXSER_EVENT_TXLOW	1
#define	MXSER_EVENT_HANGUP	2
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#define MXSER_BOARDS		4	/* Max. boards */
#define MXSER_PORTS		32	/* Max. ports */
#define MXSER_PORTS_PER_BOARD	8	/* Max. ports per board */
#define MXSER_ISR_PASS_LIMIT	256

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

#define SERIAL_TYPE_NORMAL	1
#define SERIAL_TYPE_CALLOUT	2

#define WAKEUP_CHARS		256

#define UART_MCR_AFE		0x20
#define UART_LSR_SPECIAL	0x1E

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#define RELEVANT_IFLAG(iflag)	(iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK|\
					  IXON|IXOFF))
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#define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? IRQF_SHARED : IRQF_DISABLED)
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#define C168_ASIC_ID    1
#define C104_ASIC_ID    2
#define C102_ASIC_ID	0xB
#define CI132_ASIC_ID	4
#define CI134_ASIC_ID	3
#define CI104J_ASIC_ID  5

enum {
	MXSER_BOARD_C168_ISA = 1,
	MXSER_BOARD_C104_ISA,
	MXSER_BOARD_CI104J,
	MXSER_BOARD_C168_PCI,
	MXSER_BOARD_C104_PCI,
	MXSER_BOARD_C102_ISA,
	MXSER_BOARD_CI132,
	MXSER_BOARD_CI134,
	MXSER_BOARD_CP132,
	MXSER_BOARD_CP114,
	MXSER_BOARD_CT114,
	MXSER_BOARD_CP102,
	MXSER_BOARD_CP104U,
	MXSER_BOARD_CP168U,
	MXSER_BOARD_CP132U,
	MXSER_BOARD_CP134U,
	MXSER_BOARD_CP104JU,
	MXSER_BOARD_RC7000,
	MXSER_BOARD_CP118U,
	MXSER_BOARD_CP102UL,
	MXSER_BOARD_CP102U,
};

static char *mxser_brdname[] = {
	"C168 series",
	"C104 series",
	"CI-104J series",
	"C168H/PCI series",
	"C104H/PCI series",
	"C102 series",
	"CI-132 series",
	"CI-134 series",
	"CP-132 series",
	"CP-114 series",
	"CT-114 series",
	"CP-102 series",
	"CP-104U series",
	"CP-168U series",
	"CP-132U series",
	"CP-134U series",
	"CP-104JU series",
	"Moxa UC7000 Serial",
	"CP-118U series",
	"CP-102UL series",
	"CP-102U series",
};

static int mxser_numports[] = {
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	8,			/* C168-ISA */
	4,			/* C104-ISA */
	4,			/* CI104J */
	8,			/* C168-PCI */
	4,			/* C104-PCI */
	2,			/* C102-ISA */
	2,			/* CI132 */
	4,			/* CI134 */
	2,			/* CP132 */
	4,			/* CP114 */
	4,			/* CT114 */
	2,			/* CP102 */
	4,			/* CP104U */
	8,			/* CP168U */
	2,			/* CP132U */
	4,			/* CP134U */
	4,			/* CP104JU */
	8,			/* RC7000 */
	8,			/* CP118U */
	2,			/* CP102UL */
	2,			/* CP102U */
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};

#define UART_TYPE_NUM	2

static const unsigned int Gmoxa_uart_id[UART_TYPE_NUM] = {
	MOXA_MUST_MU150_HWID,
	MOXA_MUST_MU860_HWID
};

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/* This is only for PCI */
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#define UART_INFO_NUM	3
struct mxpciuart_info {
	int type;
	int tx_fifo;
	int rx_fifo;
	int xmit_fifo_size;
	int rx_high_water;
	int rx_trigger;
	int rx_low_water;
	long max_baud;
};

static const struct mxpciuart_info Gpci_uart_info[UART_INFO_NUM] = {
	{MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
	{MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
	{MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
};


#ifdef CONFIG_PCI

static struct pci_device_id mxser_pcibrds[] = {
	{PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C168, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_C168_PCI},
	{PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C104, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_C104_PCI},
	{PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP132, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP132},
	{PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP114, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP114},
	{PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CT114, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CT114},
	{PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP102},
	{PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP104U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP104U},
	{PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP168U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP168U},
	{PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP132U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP132U},
	{PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP134U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP134U},
	{PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP104JU, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP104JU},
	{PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_RC7000, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_RC7000},
	{PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP118U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP118U},
	{PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102UL, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP102UL},
	{PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102U, PCI_ANY_ID, PCI_ANY_ID, 0, 0, MXSER_BOARD_CP102U},
	{0}
};

MODULE_DEVICE_TABLE(pci, mxser_pcibrds);


#endif

typedef struct _moxa_pci_info {
	unsigned short busNum;
	unsigned short devNum;
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	struct pci_dev *pdev;	/* add by Victor Yu. 06-23-2003 */
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} moxa_pci_info;

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

/* Variables for insmod */

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

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


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

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

	long baudrate[32];
	int databits[32];
	int stopbits[32];
	int parity[32];
	int flowctrl[32];
	int fifo[32];
	int iftype[32];
};
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struct mxser_hwconf {
	int board_type;
	int ports;
	int irq;
	int vector;
	int vector_mask;
	int uart_type;
	int ioaddr[MXSER_PORTS_PER_BOARD];
	int baud_base[MXSER_PORTS_PER_BOARD];
	moxa_pci_info pciInfo;
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	int IsMoxaMustChipFlag;	/* add by Victor Yu. 08-30-2002 */
	int MaxCanSetBaudRate[MXSER_PORTS_PER_BOARD];	/* add by Victor Yu. 09-04-2002 */
	int opmode_ioaddr[MXSER_PORTS_PER_BOARD];	/* add by Victor Yu. 01-05-2004 */
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};

struct mxser_struct {
	int port;
	int base;		/* port base address */
	int irq;		/* port using irq no. */
	int vector;		/* port irq vector */
	int vectormask;		/* port vector mask */
	int rx_high_water;
	int rx_trigger;		/* Rx fifo trigger level */
	int rx_low_water;
	int baud_base;		/* max. speed */
	int flags;		/* defined in tty.h */
	int type;		/* UART type */
	struct tty_struct *tty;
	int read_status_mask;
	int ignore_status_mask;
	int xmit_fifo_size;
	int custom_divisor;
	int x_char;		/* xon/xoff character */
	int close_delay;
	unsigned short closing_wait;
	int IER;		/* Interrupt Enable Register */
	int MCR;		/* Modem control register */
	unsigned long event;
	int count;		/* # of fd on device */
	int blocked_open;	/* # of blocked opens */
	long session;		/* Session of opening process */
	long pgrp;		/* pgrp of opening process */
	unsigned char *xmit_buf;
	int xmit_head;
	int xmit_tail;
	int xmit_cnt;
	struct work_struct tqueue;
	struct termios normal_termios;
	struct termios callout_termios;
	wait_queue_head_t open_wait;
	wait_queue_head_t close_wait;
	wait_queue_head_t delta_msr_wait;
	struct async_icount icount;	/* kernel counters for the 4 input interrupts */
	int timeout;
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	int IsMoxaMustChipFlag;	/* add by Victor Yu. 08-30-2002 */
	int MaxCanSetBaudRate;	/* add by Victor Yu. 09-04-2002 */
	int opmode_ioaddr;	/* add by Victor Yu. 01-05-2004 */
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	unsigned char stop_rx;
	unsigned char ldisc_stop_rx;
	long realbaud;
	struct mxser_mon mon_data;
	unsigned char err_shadow;
	spinlock_t slock;
};

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

static struct mxser_mstatus GMStatus[MXSER_PORTS];

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

static struct tty_driver *mxvar_sdriver;
static struct mxser_struct mxvar_table[MXSER_PORTS];
static struct tty_struct *mxvar_tty[MXSER_PORTS + 1];
static struct termios *mxvar_termios[MXSER_PORTS + 1];
static struct termios *mxvar_termios_locked[MXSER_PORTS + 1];
static struct mxser_log mxvar_log;
static int mxvar_diagflag;
static unsigned char mxser_msr[MXSER_PORTS + 1];
static struct mxser_mon_ext mon_data_ext;
static int mxser_set_baud_method[MXSER_PORTS + 1];
static spinlock_t gm_lock;

/*
 * This is used to figure out the divisor speeds and the timeouts
 */

static struct mxser_hwconf mxsercfg[MXSER_BOARDS];

/*
 * static functions:
 */

static void mxser_getcfg(int board, struct mxser_hwconf *hwconf);
static int mxser_init(void);

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/* static void   mxser_poll(unsigned long); */
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static int mxser_get_ISA_conf(int, struct mxser_hwconf *);
static int mxser_get_PCI_conf(int, int, int, struct mxser_hwconf *);
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static void mxser_do_softint(struct work_struct *);
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static int mxser_open(struct tty_struct *, struct file *);
static void mxser_close(struct tty_struct *, struct file *);
static int mxser_write(struct tty_struct *, const unsigned char *, int);
static int mxser_write_room(struct tty_struct *);
static void mxser_flush_buffer(struct tty_struct *);
static int mxser_chars_in_buffer(struct tty_struct *);
static void mxser_flush_chars(struct tty_struct *);
static void mxser_put_char(struct tty_struct *, unsigned char);
static int mxser_ioctl(struct tty_struct *, struct file *, uint, ulong);
static int mxser_ioctl_special(unsigned int, void __user *);
static void mxser_throttle(struct tty_struct *);
static void mxser_unthrottle(struct tty_struct *);
static void mxser_set_termios(struct tty_struct *, struct termios *);
static void mxser_stop(struct tty_struct *);
static void mxser_start(struct tty_struct *);
static void mxser_hangup(struct tty_struct *);
static void mxser_rs_break(struct tty_struct *, int);
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static irqreturn_t mxser_interrupt(int, void *);
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static void mxser_receive_chars(struct mxser_struct *, int *);
static void mxser_transmit_chars(struct mxser_struct *);
static void mxser_check_modem_status(struct mxser_struct *, int);
static int mxser_block_til_ready(struct tty_struct *, struct file *, struct mxser_struct *);
static int mxser_startup(struct mxser_struct *);
static void mxser_shutdown(struct mxser_struct *);
static int mxser_change_speed(struct mxser_struct *, struct termios *old_termios);
static int mxser_get_serial_info(struct mxser_struct *, struct serial_struct __user *);
static int mxser_set_serial_info(struct mxser_struct *, struct serial_struct __user *);
static int mxser_get_lsr_info(struct mxser_struct *, unsigned int __user *);
static void mxser_send_break(struct mxser_struct *, int);
static int mxser_tiocmget(struct tty_struct *, struct file *);
static int mxser_tiocmset(struct tty_struct *, struct file *, unsigned int, unsigned int);
static int mxser_set_baud(struct mxser_struct *info, long newspd);
static void mxser_wait_until_sent(struct tty_struct *tty, int timeout);

static void mxser_startrx(struct tty_struct *tty);
static void mxser_stoprx(struct tty_struct *tty);


static int CheckIsMoxaMust(int io)
{
	u8 oldmcr, hwid;
	int i;

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

	GET_MOXA_MUST_HARDWARE_ID(io, &hwid);
	for (i = 0; i < UART_TYPE_NUM; i++) {
		if (hwid == Gmoxa_uart_id[i])
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			return (int)hwid;
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	}
	return MOXA_OTHER_UART;
}

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/* above is modified by Victor Yu. 08-15-2002 */
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static const struct tty_operations mxser_ops = {
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	.open = mxser_open,
	.close = mxser_close,
	.write = mxser_write,
	.put_char = mxser_put_char,
	.flush_chars = mxser_flush_chars,
	.write_room = mxser_write_room,
	.chars_in_buffer = mxser_chars_in_buffer,
	.flush_buffer = mxser_flush_buffer,
	.ioctl = mxser_ioctl,
	.throttle = mxser_throttle,
	.unthrottle = mxser_unthrottle,
	.set_termios = mxser_set_termios,
	.stop = mxser_stop,
	.start = mxser_start,
	.hangup = mxser_hangup,
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	.break_ctl = mxser_rs_break,
	.wait_until_sent = mxser_wait_until_sent,
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	.tiocmget = mxser_tiocmget,
	.tiocmset = mxser_tiocmset,
};

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

static int __init mxser_module_init(void)
{
	int ret;

	if (verbose)
		printk(KERN_DEBUG "Loading module mxser ...\n");
	ret = mxser_init();
	if (verbose)
		printk(KERN_DEBUG "Done.\n");
	return ret;
}

static void __exit mxser_module_exit(void)
{
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	int i, err;
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	if (verbose)
		printk(KERN_DEBUG "Unloading module mxser ...\n");

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	err = tty_unregister_driver(mxvar_sdriver);
	if (!err)
		put_tty_driver(mxvar_sdriver);
	else
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		printk(KERN_ERR "Couldn't unregister MOXA Smartio/Industio family serial driver\n");

	for (i = 0; i < MXSER_BOARDS; i++) {
		struct pci_dev *pdev;

		if (mxsercfg[i].board_type == -1)
			continue;
		else {
			pdev = mxsercfg[i].pciInfo.pdev;
			free_irq(mxsercfg[i].irq, &mxvar_table[i * MXSER_PORTS_PER_BOARD]);
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			if (pdev != NULL) {	/* PCI */
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				release_region(pci_resource_start(pdev, 2), pci_resource_len(pdev, 2));
				release_region(pci_resource_start(pdev, 3), pci_resource_len(pdev, 3));
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				pci_dev_put(pdev);
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			} else {
				release_region(mxsercfg[i].ioaddr[0], 8 * mxsercfg[i].ports);
				release_region(mxsercfg[i].vector, 1);
			}
		}
	}
	if (verbose)
		printk(KERN_DEBUG "Done.\n");
}

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

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

static int mxser_initbrd(int board, struct mxser_hwconf *hwconf)
{
	struct mxser_struct *info;
	int retval;
	int i, n;

	n = board * MXSER_PORTS_PER_BOARD;
	info = &mxvar_table[n];
	/*if (verbose) */  {
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		printk(KERN_DEBUG "        ttyMI%d - ttyMI%d ",
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			n, n + hwconf->ports - 1);
		printk(" max. baud rate = %d bps.\n",
			hwconf->MaxCanSetBaudRate[0]);
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	}

	for (i = 0; i < hwconf->ports; i++, n++, info++) {
		info->port = n;
		info->base = hwconf->ioaddr[i];
		info->irq = hwconf->irq;
		info->vector = hwconf->vector;
		info->vectormask = hwconf->vector_mask;
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		info->opmode_ioaddr = hwconf->opmode_ioaddr[i];	/* add by Victor Yu. 01-05-2004 */
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		info->stop_rx = 0;
		info->ldisc_stop_rx = 0;

		info->IsMoxaMustChipFlag = hwconf->IsMoxaMustChipFlag;
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		/* Enhance mode enabled here */
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		if (info->IsMoxaMustChipFlag != MOXA_OTHER_UART) {
			ENABLE_MOXA_MUST_ENCHANCE_MODE(info->base);
		}

		info->flags = ASYNC_SHARE_IRQ;
		info->type = hwconf->uart_type;
		info->baud_base = hwconf->baud_base[i];

		info->MaxCanSetBaudRate = hwconf->MaxCanSetBaudRate[i];

		process_txrx_fifo(info);


		info->custom_divisor = hwconf->baud_base[i] * 16;
		info->close_delay = 5 * HZ / 10;
		info->closing_wait = 30 * HZ;
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		INIT_WORK(&info->tqueue, mxser_do_softint);
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		info->normal_termios = mxvar_sdriver->init_termios;
		init_waitqueue_head(&info->open_wait);
		init_waitqueue_head(&info->close_wait);
		init_waitqueue_head(&info->delta_msr_wait);
		memset(&info->mon_data, 0, sizeof(struct mxser_mon));
		info->err_shadow = 0;
		spin_lock_init(&info->slock);
	}
	/*
	 * Allocate the IRQ if necessary
	 */


	/* before set INT ISR, disable all int */
	for (i = 0; i < hwconf->ports; i++) {
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		outb(inb(hwconf->ioaddr[i] + UART_IER) & 0xf0,
			hwconf->ioaddr[i] + UART_IER);
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	}

	n = board * MXSER_PORTS_PER_BOARD;
	info = &mxvar_table[n];

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	retval = request_irq(hwconf->irq, mxser_interrupt, IRQ_T(info),
				"mxser", info);
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	if (retval) {
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		printk(KERN_ERR "Board %d: %s",
			board, mxser_brdname[hwconf->board_type - 1]);
		printk("  Request irq failed, IRQ (%d) may conflict with"
			" another device.\n", info->irq);
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		return retval;
	}
	return 0;
}

static void mxser_getcfg(int board, struct mxser_hwconf *hwconf)
{
	mxsercfg[board] = *hwconf;
}

#ifdef CONFIG_PCI
static int mxser_get_PCI_conf(int busnum, int devnum, int board_type, struct mxser_hwconf *hwconf)
{
	int i, j;
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	/* unsigned int val; */
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	unsigned int ioaddress;
	struct pci_dev *pdev = hwconf->pciInfo.pdev;

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	/* io address */
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	hwconf->board_type = board_type;
	hwconf->ports = mxser_numports[board_type - 1];
	ioaddress = pci_resource_start(pdev, 2);
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	request_region(pci_resource_start(pdev, 2), pci_resource_len(pdev, 2),
			"mxser(IO)");
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	for (i = 0; i < hwconf->ports; i++)
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		hwconf->ioaddr[i] = ioaddress + 8 * i;

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	/* vector */
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	ioaddress = pci_resource_start(pdev, 3);
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	request_region(pci_resource_start(pdev, 3), pci_resource_len(pdev, 3),
			"mxser(vector)");
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	hwconf->vector = ioaddress;

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	/* irq */
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	hwconf->irq = hwconf->pciInfo.pdev->irq;

	hwconf->IsMoxaMustChipFlag = CheckIsMoxaMust(hwconf->ioaddr[0]);
	hwconf->uart_type = PORT_16550A;
	hwconf->vector_mask = 0;


	for (i = 0; i < hwconf->ports; i++) {
		for (j = 0; j < UART_INFO_NUM; j++) {
			if (Gpci_uart_info[j].type == hwconf->IsMoxaMustChipFlag) {
				hwconf->MaxCanSetBaudRate[i] = Gpci_uart_info[j].max_baud;

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				/* exception....CP-102 */
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				if (board_type == MXSER_BOARD_CP102)
					hwconf->MaxCanSetBaudRate[i] = 921600;
				break;
			}
		}
	}

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

	for (i = 0; i < hwconf->ports; i++) {
		hwconf->vector_mask |= (1 << i);
		hwconf->baud_base[i] = 921600;
	}
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	return 0;
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}
#endif

static int mxser_init(void)
{
	int i, m, retval, b, n;
	struct pci_dev *pdev = NULL;
	int index;
	unsigned char busnum, devnum;
	struct mxser_hwconf hwconf;

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

	for (i = 0; i < MXSER_BOARDS; i++) {
		mxsercfg[i].board_type = -1;
	}

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	printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
		MXSER_VERSION);
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	/* Initialize the tty_driver structure */
	memset(mxvar_sdriver, 0, sizeof(struct tty_driver));
	mxvar_sdriver->magic = TTY_DRIVER_MAGIC;
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	mxvar_sdriver->name = "ttyMI";
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	mxvar_sdriver->major = ttymajor;
	mxvar_sdriver->minor_start = 0;
	mxvar_sdriver->num = MXSER_PORTS + 1;
	mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
	mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
	mxvar_sdriver->init_termios = tty_std_termios;
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	mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
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	mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW;
	tty_set_operations(mxvar_sdriver, &mxser_ops);
	mxvar_sdriver->ttys = mxvar_tty;
	mxvar_sdriver->termios = mxvar_termios;
	mxvar_sdriver->termios_locked = mxvar_termios_locked;

	mxvar_diagflag = 0;
	memset(mxvar_table, 0, MXSER_PORTS * sizeof(struct mxser_struct));
	memset(&mxvar_log, 0, sizeof(struct mxser_log));

	memset(&mxser_msr, 0, sizeof(unsigned char) * (MXSER_PORTS + 1));
	memset(&mon_data_ext, 0, sizeof(struct mxser_mon_ext));
	memset(&mxser_set_baud_method, 0, sizeof(int) * (MXSER_PORTS + 1));
	memset(&hwconf, 0, sizeof(struct mxser_hwconf));

	m = 0;
	/* Start finding ISA boards here */
	for (b = 0; b < MXSER_BOARDS && m < MXSER_BOARDS; b++) {
		int cap;
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		if (!(cap = mxserBoardCAP[b]))
			continue;

		retval = mxser_get_ISA_conf(cap, &hwconf);

		if (retval != 0)
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			printk(KERN_INFO "Found MOXA %s board (CAP=0x%x)\n",
				mxser_brdname[hwconf.board_type - 1], ioaddr[b]);
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		if (retval <= 0) {
			if (retval == MXSER_ERR_IRQ)
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				printk(KERN_ERR "Invalid interrupt number, "
					"board not configured\n");
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			else if (retval == MXSER_ERR_IRQ_CONFLIT)
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				printk(KERN_ERR "Invalid interrupt number, "
					"board not configured\n");
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			else if (retval == MXSER_ERR_VECTOR)
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				printk(KERN_ERR "Invalid interrupt vector, "
					"board not configured\n");
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			else if (retval == MXSER_ERR_IOADDR)
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				printk(KERN_ERR "Invalid I/O address, "
					"board not configured\n");
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			continue;
		}

		hwconf.pciInfo.busNum = 0;
		hwconf.pciInfo.devNum = 0;
		hwconf.pciInfo.pdev = NULL;

		mxser_getcfg(m, &hwconf);
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		/*
		 * init mxsercfg first,
		 * or mxsercfg data is not correct on ISR.
		 */
		/* mxser_initbrd will hook ISR. */
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		if (mxser_initbrd(m, &hwconf) < 0)
			continue;

		m++;
	}

	/* Start finding ISA boards from module arg */
	for (b = 0; b < MXSER_BOARDS && m < MXSER_BOARDS; b++) {
		int cap;
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		if (!(cap = ioaddr[b]))
			continue;

		retval = mxser_get_ISA_conf(cap, &hwconf);

		if (retval != 0)
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			printk(KERN_INFO "Found MOXA %s board (CAP=0x%x)\n",
				mxser_brdname[hwconf.board_type - 1], ioaddr[b]);
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		if (retval <= 0) {
			if (retval == MXSER_ERR_IRQ)
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				printk(KERN_ERR "Invalid interrupt number, "
					"board not configured\n");
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			else if (retval == MXSER_ERR_IRQ_CONFLIT)
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				printk(KERN_ERR "Invalid interrupt number, "
					"board not configured\n");
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			else if (retval == MXSER_ERR_VECTOR)
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				printk(KERN_ERR "Invalid interrupt vector, "
					"board not configured\n");
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			else if (retval == MXSER_ERR_IOADDR)
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				printk(KERN_ERR "Invalid I/O address, "
					"board not configured\n");
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			continue;
		}

		hwconf.pciInfo.busNum = 0;
		hwconf.pciInfo.devNum = 0;
		hwconf.pciInfo.pdev = NULL;

		mxser_getcfg(m, &hwconf);
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		/*
		 * init mxsercfg first,
		 * or mxsercfg data is not correct on ISR.
		 */
		/* mxser_initbrd will hook ISR. */
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		if (mxser_initbrd(m, &hwconf) < 0)
			continue;

		m++;
	}

	/* start finding PCI board here */
#ifdef CONFIG_PCI
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	n = ARRAY_SIZE(mxser_pcibrds) - 1;
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	index = 0;
	b = 0;
	while (b < n) {
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		pdev = pci_get_device(mxser_pcibrds[b].vendor,
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				mxser_pcibrds[b].device, pdev);
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		if (pdev == NULL) {
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			b++;
			continue;
		}
		hwconf.pciInfo.busNum = busnum = pdev->bus->number;
		hwconf.pciInfo.devNum = devnum = PCI_SLOT(pdev->devfn) << 3;
		hwconf.pciInfo.pdev = pdev;
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		printk(KERN_INFO "Found MOXA %s board(BusNo=%d,DevNo=%d)\n",
			mxser_brdname[(int) (mxser_pcibrds[b].driver_data) - 1],
			busnum, devnum >> 3);
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		index++;
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		if (m >= MXSER_BOARDS)
			printk(KERN_ERR
				"Too many Smartio/Industio family boards find "
				"(maximum %d), board not configured\n",
				MXSER_BOARDS);
		else {
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			if (pci_enable_device(pdev)) {
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				printk(KERN_ERR "Moxa SmartI/O PCI enable "
					"fail !\n");
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				continue;
			}
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			retval = mxser_get_PCI_conf(busnum, devnum,
					(int)mxser_pcibrds[b].driver_data,
					&hwconf);
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			if (retval < 0) {
				if (retval == MXSER_ERR_IRQ)
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					printk(KERN_ERR
						"Invalid interrupt number, "
						"board not configured\n");
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				else if (retval == MXSER_ERR_IRQ_CONFLIT)
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					printk(KERN_ERR
						"Invalid interrupt number, "
						"board not configured\n");
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				else if (retval == MXSER_ERR_VECTOR)
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					printk(KERN_ERR
						"Invalid interrupt vector, "
						"board not configured\n");
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				else if (retval == MXSER_ERR_IOADDR)
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					printk(KERN_ERR
						"Invalid I/O address, "
						"board not configured\n");
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				continue;
			}
			mxser_getcfg(m, &hwconf);
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			/* init mxsercfg first,
			 * or mxsercfg data is not correct on ISR.
			 */
			/* mxser_initbrd will hook ISR. */
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			if (mxser_initbrd(m, &hwconf) < 0)
				continue;
			m++;
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			/* Keep an extra reference if we succeeded. It will
			   be returned at unload time */
			pci_dev_get(pdev);
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		}
	}
#endif

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	retval = tty_register_driver(mxvar_sdriver);
	if (retval) {
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		printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family"
				" driver !\n");
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		put_tty_driver(mxvar_sdriver);
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		for (i = 0; i < MXSER_BOARDS; i++) {
			if (mxsercfg[i].board_type == -1)
				continue;
			else {
				free_irq(mxsercfg[i].irq, &mxvar_table[i * MXSER_PORTS_PER_BOARD]);
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				/* todo: release io, vector */
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			}
		}
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		return retval;
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	}

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	return 0;
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}

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static void mxser_do_softint(struct work_struct *work)
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{
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	struct mxser_struct *info =
		container_of(work, struct mxser_struct, tqueue);
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	struct tty_struct *tty;

	tty = info->tty;

	if (tty) {
		if (test_and_clear_bit(MXSER_EVENT_TXLOW, &info->event))
			tty_wakeup(tty);
		if (test_and_clear_bit(MXSER_EVENT_HANGUP, &info->event))
			tty_hangup(tty);
	}
}

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

	status = inb(baseaddr + UART_MSR);

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

	return status;
}

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

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	/* initialize driver_data in case something fails */
	tty->driver_data = NULL;

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	line = tty->index;
	if (line == MXSER_PORTS)
		return 0;
	if (line < 0 || line > MXSER_PORTS)
		return -ENODEV;
	info = mxvar_table + line;
	if (!info->base)
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		return -ENODEV;
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	tty->driver_data = info;
	info->tty = tty;
	/*
	 * Start up serial port
	 */
	retval = mxser_startup(info);
	if (retval)
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		return retval;
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	retval = mxser_block_til_ready(tty, filp, info);
	if (retval)
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		return retval;
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	info->count++;

	if ((info->count == 1) && (info->flags & ASYNC_SPLIT_TERMIOS)) {
		if (tty->driver->subtype == SERIAL_TYPE_NORMAL)
			*tty->termios = info->normal_termios;
		else
			*tty->termios = info->callout_termios;
		mxser_change_speed(info, NULL);
	}

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	info->session = process_session(current);
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	info->pgrp = process_group(current);

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	/*
	status = mxser_get_msr(info->base, 0, info->port);
	mxser_check_modem_status(info, status);
	*/
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/* unmark here for very high baud rate (ex. 921600 bps) used */
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	tty->low_latency = 1;
	return 0;
}

/*
 * This routine is called when the serial port gets closed.  First, we
 * wait for the last remaining data to be sent.  Then, we unlink its
 * async structure from the interrupt chain if necessary, and we free
 * that IRQ if nothing is left in the chain.
 */
static void mxser_close(struct tty_struct *tty, struct file *filp)
{
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	struct mxser_struct *info = tty->driver_data;
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	unsigned long timeout;
	unsigned long flags;
	struct tty_ldisc *ld;

	if (tty->index == MXSER_PORTS)
		return;
	if (!info)
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		return;
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	spin_lock_irqsave(&info->slock, flags);

	if (tty_hung_up_p(filp)) {
		spin_unlock_irqrestore(&info->slock, flags);
		return;
	}
	if ((tty->count == 1) && (info->count != 1)) {
		/*
		 * Uh, oh.  tty->count is 1, which means that the tty
		 * structure will be freed.  Info->count should always
		 * be one in these conditions.  If it's greater than
		 * one, we've got real problems, since it means the
		 * serial port won't be shutdown.
		 */
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		printk(KERN_ERR "mxser_close: bad serial port count; "
			"tty->count is 1, info->count is %d\n", info->count);
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		info->count = 1;
	}
	if (--info->count < 0) {
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		printk(KERN_ERR "mxser_close: bad serial port count for "
			"ttys%d: %d\n", info->port, info->count);
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		info->count = 0;
	}
	if (info->count) {
		spin_unlock_irqrestore(&info->slock, flags);
		return;
	}
	info->flags |= ASYNC_CLOSING;
	spin_unlock_irqrestore(&info->slock, flags);
	/*
	 * Save the termios structure, since this port may have
	 * separate termios for callout and dialin.
	 */
	if (info->flags & ASYNC_NORMAL_ACTIVE)
		info->normal_termios = *tty->termios;
	/*
	 * Now we wait for the transmit buffer to clear; and we notify
	 * the line discipline to only process XON/XOFF characters.
	 */
	tty->closing = 1;
	if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
		tty_wait_until_sent(tty, info->closing_wait);
	/*
	 * At this point we stop accepting input.  To do this, we
	 * disable the receive line status interrupts, and tell the
	 * interrupt driver to stop checking the data ready bit in the
	 * line status register.
	 */
	info->IER &= ~UART_IER_RLSI;
	if (info->IsMoxaMustChipFlag)
		info->IER &= ~MOXA_MUST_RECV_ISR;
/* by William
	info->read_status_mask &= ~UART_LSR_DR;
*/
	if (info->flags & ASYNC_INITIALIZED) {
		outb(info->IER, info->base + UART_IER);
		/*
		 * Before we drop DTR, make sure the UART transmitter
		 * has completely drained; this is especially
		 * important if there is a transmit FIFO!
		 */
		timeout = jiffies + HZ;
		while (!(inb(info->base + UART_LSR) & UART_LSR_TEMT)) {
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			schedule_timeout_interruptible(5);
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			if (time_after(jiffies, timeout))
				break;
		}
	}
	mxser_shutdown(info);

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

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

}

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

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

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

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

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

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

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	if (!info->xmit_buf)
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		return;

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

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


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

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

	spin_lock_irqsave(&info->slock, flags);

	info->IER |= UART_IER_THRI;
	outb(info->IER, info->base + UART_IER);

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

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

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

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

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


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

	/* below added by shinhay */
	fcr = inb(info->base + UART_FCR);
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	outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
		info->base + UART_FCR);
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	outb(fcr, info->base + UART_FCR);

	spin_unlock_irqrestore(&info->slock, flags);
	/* above added by shinhay */

	wake_up_interruptible(&tty->write_wait);
	if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup)
		(tty->ldisc.write_wakeup) (tty);
}

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

	if (tty->index == MXSER_PORTS)
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		return mxser_ioctl_special(cmd, argp);
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	/* following add by Victor Yu. 01-05-2004 */
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	if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
		int opmode, p;
		static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
		int shiftbit;
		unsigned char val, mask;

		p = info->port % 4;
		if (cmd == MOXA_SET_OP_MODE) {
			if (get_user(opmode, (int __user *) argp))
				return -EFAULT;
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			if (opmode != RS232_MODE &&
					opmode != RS485_2WIRE_MODE &&
					opmode != RS422_MODE &&
					opmode != RS485_4WIRE_MODE)
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				return -EFAULT;
			mask = ModeMask[p];
			shiftbit = p * 2;
			val = inb(info->opmode_ioaddr);
			val &= mask;
			val |= (opmode << shiftbit);
			outb(val, info->opmode_ioaddr);
		} else {
			shiftbit = p * 2;
			opmode = inb(info->opmode_ioaddr) >> shiftbit;
			opmode &= OP_MODE_MASK;
			if (copy_to_user(argp, &opmode, sizeof(int)))
				return -EFAULT;
		}
		return 0;
	}
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	/* above add by Victor Yu. 01-05-2004 */
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	if ((cmd != TIOCGSERIAL) && (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
		if (tty->flags & (1 << TTY_IO_ERROR))
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			return -EIO;
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	}
	switch (cmd) {
	case TCSBRK:		/* SVID version: non-zero arg --> no break */
		retval = tty_check_change(tty);
		if (retval)
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			return retval;
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		tty_wait_until_sent(tty, 0);
		if (!arg)
			mxser_send_break(info, HZ / 4);	/* 1/4 second */
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		return 0;
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	case TCSBRKP:		/* support for POSIX tcsendbreak() */
		retval = tty_check_change(tty);
		if (retval)
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			return retval;
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		tty_wait_until_sent(tty, 0);
		mxser_send_break(info, arg ? arg * (HZ / 10) : HZ / 4);
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		return 0;
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	case TIOCGSOFTCAR:
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		return put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long __user *)argp);
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	case TIOCSSOFTCAR:
		if (get_user(templ, (unsigned long __user *) argp))
			return -EFAULT;
		arg = templ;
		tty->termios->c_cflag = ((tty->termios->c_cflag & ~CLOCAL) | (arg ? CLOCAL : 0));
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		return 0;
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	case TIOCGSERIAL:
		return mxser_get_serial_info(info, argp);
	case TIOCSSERIAL:
		return mxser_set_serial_info(info, argp);
	case TIOCSERGETLSR:	/* Get line status register */
		return mxser_get_lsr_info(info, argp);
		/*
		 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
		 * - mask passed in arg for lines of interest
		 *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
		 * Caller should use TIOCGICOUNT to see which one it was
		 */
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	case TIOCMIWAIT: {
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			DECLARE_WAITQUEUE(wait, current);
			int ret;
			spin_lock_irqsave(&info->slock, flags);
			cprev = info->icount;	/* note the counters on entry */
			spin_unlock_irqrestore(&info->slock, flags);

			add_wait_queue(&info->delta_msr_wait, &wait);
			while (1) {
				spin_lock_irqsave(&info->slock, flags);
				cnow = info->icount;	/* atomic copy */
				spin_unlock_irqrestore(&info->slock, flags);

				set_current_state(TASK_INTERRUPTIBLE);
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				if (((arg & TIOCM_RNG) &&
						(cnow.rng != cprev.rng)) ||
						((arg & TIOCM_DSR) &&
						(cnow.dsr != cprev.dsr)) ||
						((arg & TIOCM_CD) &&
						(cnow.dcd != cprev.dcd)) ||
						((arg & TIOCM_CTS) &&
						(cnow.cts != cprev.cts))) {
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					ret = 0;
					break;
				}
				/* see if a signal did it */
				if (signal_pending(current)) {
					ret = -ERESTARTSYS;
					break;
				}
				cprev = cnow;
			}
			current->state = TASK_RUNNING;
			remove_wait_queue(&info->delta_msr_wait, &wait);
			break;
		}
		/* NOTREACHED */
		/*
		 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
		 * Return: write counters to the user passed counter struct
		 * NB: both 1->0 and 0->1 transitions are counted except for
		 *     RI where only 0->1 is counted.
		 */
	case TIOCGICOUNT:
		spin_lock_irqsave(&info->slock, flags);
		cnow = info->icount;
		spin_unlock_irqrestore(&info->slock, flags);
		p_cuser = argp;
		/* modified by casper 1/11/2000 */
		if (put_user(cnow.frame, &p_cuser->frame))
			return -EFAULT;
		if (put_user(cnow.brk, &p_cuser->brk))
			return -EFAULT;
		if (put_user(cnow.overrun, &p_cuser->overrun))
			return -EFAULT;
		if (put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
			return -EFAULT;
		if (put_user(cnow.parity, &p_cuser->parity))
			return -EFAULT;
		if (put_user(cnow.rx, &p_cuser->rx))
			return -EFAULT;
		if (put_user(cnow.tx, &p_cuser->tx))
			return -EFAULT;
		put_user(cnow.cts, &p_cuser->cts);
		put_user(cnow.dsr, &p_cuser->dsr);
		put_user(cnow.rng, &p_cuser->rng);
		put_user(cnow.dcd, &p_cuser->dcd);
		return 0;
	case MOXA_HighSpeedOn:
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		return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
	case MOXA_SDS_RSTICOUNTER: {
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			info->mon_data.rxcnt = 0;
			info->mon_data.txcnt = 0;
			return 0;
		}
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/* (above) added by James. */
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	case MOXA_ASPP_SETBAUD:{
			long baud;
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			if (get_user(baud, (long __user *)argp))
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				return -EFAULT;
			mxser_set_baud(info, baud);
			return 0;
		}
	case MOXA_ASPP_GETBAUD:
		if (copy_to_user(argp, &info->realbaud, sizeof(long)))
			return -EFAULT;

		return 0;

	case MOXA_ASPP_OQUEUE:{
			int len, lsr;

			len = mxser_chars_in_buffer(tty);

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

			len += (lsr ? 0 : 1);

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

			return 0;
		}
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	case MOXA_ASPP_MON: {
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			int mcr, status;
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			/* info->mon_data.ser_param = tty->termios->c_cflag; */
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			status = mxser_get_msr(info->base, 1, info->port, info);
			mxser_check_modem_status(info, status);

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

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

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

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

			return 0;
		}

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

			info->err_shadow = 0;
			return 0;
		}
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	case MOXA_SET_BAUD_METHOD: {
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			int method;
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			if (get_user(method, (int __user *)argp))
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				return -EFAULT;
			mxser_set_baud_method[info->port] = method;
			if (copy_to_user(argp, &method, sizeof(int)))
				return -EFAULT;

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

#ifndef CMSPAR
#define	CMSPAR 010000000000
#endif

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

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

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

	case MOXA_CHKPORTENABLE:
		result = 0;
		for (i = 0; i < MXSER_PORTS; i++) {
			if (mxvar_table[i].base)
				result |= (1 << i);
		}
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		return put_user(result, (unsigned long __user *)argp);
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	case MOXA_GETDATACOUNT:
		if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
			return -EFAULT;
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		return 0;
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	case MOXA_GETMSTATUS:
		for (i = 0; i < MXSER_PORTS; i++) {
			GMStatus[i].ri = 0;
			if (!mxvar_table[i].base) {
				GMStatus[i].dcd = 0;
				GMStatus[i].dsr = 0;
				GMStatus[i].cts = 0;
				continue;
			}

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

			status = inb(mxvar_table[i].base + UART_MSR);
			if (status & 0x80 /*UART_MSR_DCD */ )
				GMStatus[i].dcd = 1;
			else
				GMStatus[i].dcd = 0;

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


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

			for (i = 0; i < MXSER_PORTS; i++) {
				if (!mxvar_table[i].base)
					continue;

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				status = mxser_get_msr(mxvar_table[i].base, 0,
							i, &(mxvar_table[i]));
				/*
				mxser_check_modem_status(&mxvar_table[i],
								status);
				*/
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				if (status & UART_MSR_TERI)
					mxvar_table[i].icount.rng++;
				if (status & UART_MSR_DDSR)
					mxvar_table[i].icount.dsr++;
				if (status & UART_MSR_DDCD)
					mxvar_table[i].icount.dcd++;
				if (status & UART_MSR_DCTS)
					mxvar_table[i].icount.cts++;

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

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

				mon_data_ext.databits[i] = cflag & CSIZE;

				mon_data_ext.stopbits[i] = cflag & CSTOPB;

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

				mon_data_ext.flowctrl[i] = 0x00;

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

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

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

				p = i % 4;
				shiftbit = p * 2;
				opmode = inb(mxvar_table[i].opmode_ioaddr) >> shiftbit;
				opmode &= OP_MODE_MASK;

				mon_data_ext.iftype[i] = opmode;

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

			return 0;

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

static void mxser_stoprx(struct tty_struct *tty)
{
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	struct mxser_struct *info = tty->driver_data;
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	/* unsigned long flags; */
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	info->ldisc_stop_rx = 1;
	if (I_IXOFF(tty)) {
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		/* MX_LOCK(&info->slock); */
		/* following add by Victor Yu. 09-02-2002 */
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		if (info->IsMoxaMustChipFlag) {
			info->IER &= ~MOXA_MUST_RECV_ISR;
			outb(info->IER, info->base + UART_IER);
		} else {
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			/* above add by Victor Yu. 09-02-2002 */
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			info->x_char = STOP_CHAR(tty);
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			/* mask by Victor Yu. 09-02-2002 */
			/* outb(info->IER, 0); */
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			outb(0, info->base + UART_IER);
			info->IER |= UART_IER_THRI;
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			/* force Tx interrupt */
			outb(info->IER, info->base + UART_IER);
		}		/* add by Victor Yu. 09-02-2002 */
		/* MX_UNLOCK(&info->slock); */
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	}

	if (info->tty->termios->c_cflag & CRTSCTS) {
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		/* MX_LOCK(&info->slock); */
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		info->MCR &= ~UART_MCR_RTS;
		outb(info->MCR, info->base + UART_MCR);
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		/* MX_UNLOCK(&info->slock); */
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	}
}

static void mxser_startrx(struct tty_struct *tty)
{
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	struct mxser_struct *info = tty->driver_data;
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	/* unsigned long flags; */
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	info->ldisc_stop_rx = 0;
	if (I_IXOFF(tty)) {
		if (info->x_char)
			info->x_char = 0;
		else {
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			/* MX_LOCK(&info->slock); */
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			/* following add by Victor Yu. 09-02-2002 */
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			if (info->IsMoxaMustChipFlag) {
				info->IER |= MOXA_MUST_RECV_ISR;
				outb(info->IER, info->base + UART_IER);
			} else {
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				/* above add by Victor Yu. 09-02-2002 */
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				info->x_char = START_CHAR(tty);
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				/* mask by Victor Yu. 09-02-2002 */
				/* outb(info->IER, 0); */
				/* add by Victor Yu. 09-02-2002 */
				outb(0, info->base + UART_IER);
				/* force Tx interrupt */
				info->IER |= UART_IER_THRI;
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				outb(info->IER, info->base + UART_IER);