mxser.c

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/*
 *          mxser.c  -- MOXA Smartio/Industio family multiport serial driver.
 *
 *      Copyright (C) 1999-2001  Moxa Technologies ([e-mail]).
 *
 *      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.
 *
 *	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
 *	<[e-mail]>. The original 1.8 code is available on www.moxa.com.
 *	- Fixed x86_64 cleanness
 *	- Fixed sleep with spinlock held in mxser_send_break
 */


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

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

#include "mxser.h"

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

#define	MXSER_EVENT_TXLOW	1
#define	MXSER_EVENT_HANGUP	2

#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


#define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? IRQF_SHARED : IRQF_DISABLED)

#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[] = {
	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 */
};

#define UART_TYPE_NUM	2

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

/* This is only for PCI */
#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;
	struct pci_dev *pdev;	/* add by Victor Yu. 06-23-2003 */
} 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");
module_param_array(ioaddr, int, NULL, 0);
module_param(ttymajor, int, 0);
module_param(calloutmajor, int, 0);
module_param(verbose, bool, 0);
MODULE_LICENSE("GPL");

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


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

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

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

struct mxser_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;
	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 */
};

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 */
	unsigned char *xmit_buf;
	int xmit_head;
	int xmit_tail;
	int xmit_cnt;
	struct work_struct tqueue;
	struct ktermios normal_termios;
	struct ktermios 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;
	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 */
	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
	/*  0x180, 0x280, 0x200, 0x320 */
};

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 ktermios *mxvar_termios[MXSER_PORTS + 1];
static struct ktermios *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);

/* static void   mxser_poll(unsigned long); */
static int mxser_get_ISA_conf(int, struct mxser_hwconf *);
static void mxser_do_softint(struct work_struct *);
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 ktermios *);
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);
static irqreturn_t mxser_interrupt(int, void *);
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 ktermios *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);

#ifdef CONFIG_PCI
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);
		return MOXA_OTHER_UART;
	}

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

/* above is modified by Victor Yu. 08-15-2002 */

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

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

static 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)
{
	int i, err;