/drivers/net/ixgbe/

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/*****************************************************************************/
/*
 *           moxa.c  -- MOXA Intellio family multiport serial driver.
 *
 *      Copyright (C) 1999-2000  Moxa Technologies (support@moxa.com).
 *      Copyright (c) 2007 Jiri Slaby <jirislaby@gmail.com>
 *
 *      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.
 */

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

#include <linux/module.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/errno.h>
#include <linux/firmware.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 <linux/slab.h>
#include <linux/ratelimit.h>

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

#include "moxa.h"

#define MOXA_VERSION		"6.0k"

#define MOXA_FW_HDRLEN		32

#define MOXAMAJOR		172

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

#define MOXA_IS_320(brd) ((brd)->boardType == MOXA_BOARD_C320_ISA || \
		(brd)->boardType == MOXA_BOARD_C320_PCI)

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

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_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C218),
		.driver_data = MOXA_BOARD_C218_PCI },
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C320),
		.driver_data = MOXA_BOARD_C320_PCI },
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP204J),
		.driver_data = MOXA_BOARD_CP204J },
	{ 0 }
};
MODULE_DEVICE_TABLE(pci, moxa_pcibrds);
#endif /* CONFIG_PCI */

struct moxa_port;

static struct moxa_board_conf {
	int boardType;
	int numPorts;
	int busType;

	unsigned int ready;

	struct moxa_port *ports;

	void __iomem *basemem;
	void __iomem *intNdx;
	void __iomem *intPend;
	void __iomem *intTable;
} moxa_boards[MAX_BOARDS];

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

struct moxaq_str {
	int inq;
	int outq;
};

struct moxa_port {
	struct tty_port port;
	struct moxa_board_conf *board;
	void __iomem *tableAddr;

	int type;
	int cflag;
	unsigned long statusflags;

	u8 DCDState;		/* Protected by the port lock */
	u8 lineCtrl;
	u8 lowChkFlag;
};

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

/* statusflags */
#define TXSTOPPED	1
#define LOWWAIT 	2
#define EMPTYWAIT	3

#define SERIAL_DO_RESTART

#define WAKEUP_CHARS		256

static int ttymajor = MOXAMAJOR;
static struct mon_str moxaLog;
static unsigned int moxaFuncTout = HZ / 2;
static unsigned int moxaLowWaterChk;
static DEFINE_MUTEX(moxa_openlock);
static DEFINE_SPINLOCK(moxa_lock);

static unsigned long baseaddr[MAX_BOARDS];
static unsigned int type[MAX_BOARDS];
static unsigned int numports[MAX_BOARDS];
static struct tty_port moxa_service_port;

MODULE_AUTHOR("William Chen");
MODULE_DESCRIPTION("MOXA Intellio Family Multiport Board Device Driver");
MODULE_LICENSE("GPL");
MODULE_FIRMWARE("c218tunx.cod");
MODULE_FIRMWARE("cp204unx.cod");
MODULE_FIRMWARE("c320tunx.cod");

module_param_array(type, uint, NULL, 0);
MODULE_PARM_DESC(type, "card type: C218=2, C320=4");
module_param_array(baseaddr, ulong, NULL, 0);
MODULE_PARM_DESC(baseaddr, "base address");
module_param_array(numports, uint, NULL, 0);
MODULE_PARM_DESC(numports, "numports (ignored for C218)");

module_param(ttymajor, int, 0);

/*
 * static functions:
 */
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_set_termios(struct tty_struct *, struct ktermios *);
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);
static int moxa_tiocmset(struct tty_struct *tty,
			 unsigned int set, unsigned int clear);
static void moxa_poll(unsigned long);
static void moxa_set_tty_param(struct tty_struct *, struct ktermios *);
static void moxa_shutdown(struct tty_port *);
static int moxa_carrier_raised(struct tty_port *);
static void moxa_dtr_rts(struct tty_port *, int);
/*
 * moxa board interface functions:
 */
static void MoxaPortEnable(struct moxa_port *);
static void MoxaPortDisable(struct moxa_port *);
static int MoxaPortSetTermio(struct moxa_port *, struct ktermios *, speed_t);
static int MoxaPortGetLineOut(struct moxa_port *, int *, int *);
static void MoxaPortLineCtrl(struct moxa_port *, int, int);
static void MoxaPortFlowCtrl(struct moxa_port *, int, int, int, int, int);
static int MoxaPortLineStatus(struct moxa_port *);
static void MoxaPortFlushData(struct moxa_port *, int);
static int MoxaPortWriteData(struct tty_struct *, const unsigned char *, int);
static int MoxaPortReadData(struct moxa_port *);
static int MoxaPortTxQueue(struct moxa_port *);
static int MoxaPortRxQueue(struct moxa_port *);
static int MoxaPortTxFree(struct moxa_port *);
static void MoxaPortTxDisable(struct moxa_port *);
static void MoxaPortTxEnable(struct moxa_port *);
static int moxa_get_serial_info(struct moxa_port *, struct serial_struct __user *);
static int moxa_set_serial_info(struct moxa_port *, struct serial_struct __user *);
static void MoxaSetFifo(struct moxa_port *port, int enable);

/*
 * I/O functions
 */

static DEFINE_SPINLOCK(moxafunc_lock);

static void moxa_wait_finish(void __iomem *ofsAddr)
{
	unsigned long end = jiffies + moxaFuncTout;

	while (readw(ofsAddr + FuncCode) != 0)
		if (time_after(jiffies, end))
			return;
	if (readw(ofsAddr + FuncCode) != 0)
		printk_ratelimited(KERN_WARNING "moxa function expired\n");
}

static void moxafunc(void __iomem *ofsAddr, u16 cmd, u16 arg)
{
        unsigned long flags;
        spin_lock_irqsave(&moxafunc_lock, flags);
	writew(arg, ofsAddr + FuncArg);
	writew(cmd, ofsAddr + FuncCode);
	moxa_wait_finish(ofsAddr);
	spin_unlock_irqrestore(&moxafunc_lock, flags);
}

static int moxafuncret(void __iomem *ofsAddr, u16 cmd, u16 arg)
{
        unsigned long flags;
        u16 ret;
        spin_lock_irqsave(&moxafunc_lock, flags);
	writew(arg, ofsAddr + FuncArg);
	writew(cmd, ofsAddr + FuncCode);
	moxa_wait_finish(ofsAddr);
	ret = readw(ofsAddr + FuncArg);
	spin_unlock_irqrestore(&moxafunc_lock, flags);
	return ret;
}

static void moxa_low_water_check(void __iomem *ofsAddr)
{
	u16 rptr, wptr, mask, len;

	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);
	}
}

/*
 * TTY operations
 */

static int moxa_ioctl(struct tty_struct *tty,
		      unsigned int cmd, unsigned long arg)
{
	struct moxa_port *ch = tty->driver_data;
	void __user *argp = (void __user *)arg;
	int status, ret = 0;

	if (tty->index == MAX_PORTS) {
		if (cmd != MOXA_GETDATACOUNT && cmd != MOXA_GET_IOQUEUE &&
				cmd != MOXA_GETMSTATUS)
			return -EINVAL;
	} else if (!ch)
		return -ENODEV;

	switch (cmd) {
	case MOXA_GETDATACOUNT:
		moxaLog.tick = jiffies;
		if (copy_to_user(argp, &moxaLog, sizeof(moxaLog)))
			ret = -EFAULT;
		break;
	case MOXA_FLUSH_QUEUE:
		MoxaPortFlushData(ch, arg);
		break;
	case MOXA_GET_IOQUEUE: {
		struct moxaq_str __user *argm = argp;
		struct moxaq_str tmp;
		struct moxa_port *p;
		unsigned int i, j;

		for (i = 0; i < MAX_BOARDS; i++) {
			p = moxa_boards[i].ports;
			for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
				memset(&tmp, 0, sizeof(tmp));
				spin_lock_bh(&moxa_lock);
				if (moxa_boards[i].ready) {
					tmp.inq = MoxaPortRxQueue(p);
					tmp.outq = MoxaPortTxQueue(p);
				}
				spin_unlock_bh(&moxa_lock);
				if (copy_to_user(argm, &tmp, sizeof(tmp)))
					return -EFAULT;
			}
		}
		break;
	} case MOXA_GET_OQUEUE:
		status = MoxaPortTxQueue(ch);
		ret = put_user(status, (unsigned long __user *)argp);
		break;
	case MOXA_GET_IQUEUE:
		status = MoxaPortRxQueue(ch);
		ret = put_user(status, (unsigned long __user *)argp);
		break;
	case MOXA_GETMSTATUS: {
		struct mxser_mstatus __user *argm = argp;
		struct mxser_mstatus tmp;
		struct moxa_port *p;
		unsigned int i, j;

		for (i = 0; i < MAX_BOARDS; i++) {
			p = moxa_boards[i].ports;
			for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
				struct tty_struct *ttyp;
				memset(&tmp, 0, sizeof(tmp));
				spin_lock_bh(&moxa_lock);
				if (!moxa_boards[i].ready) {
				        spin_unlock_bh(&moxa_lock);
					goto copy;
                                }

				status = MoxaPortLineStatus(p);
				spin_unlock_bh(&moxa_lock);

				if (status & 1)
					tmp.cts = 1;
				if (status & 2)
					tmp.dsr = 1;
				if (status & 4)
					tmp.dcd = 1;

				ttyp = tty_port_tty_get(&p->port);
				if (!ttyp)
					tmp.cflag = p->cflag;
				else
					tmp.cflag = ttyp->termios.c_cflag;
				tty_kref_put(ttyp);
copy:
				if (copy_to_user(argm, &tmp, sizeof(tmp)))
					return -EFAULT;
			}
		}
		break;
	}
	case TIOCGSERIAL:
	        mutex_lock(&ch->port.mutex);
		ret = moxa_get_serial_info(ch, argp);
		mutex_unlock(&ch->port.mutex);
		break;
	case TIOCSSERIAL:
	        mutex_lock(&ch->port.mutex);
		ret = moxa_set_serial_info(ch, argp);
		mutex_unlock(&ch->port.mutex);
		break;
	default:
		ret = -ENOIOCTLCMD;
	}
	return ret;
}

static int moxa_break_ctl(struct tty_struct *tty, int state)
{
	struct moxa_port *port = tty->driver_data;

	moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak,
			Magic_code);
	return 0;
}

static const 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,
	.ioctl = moxa_ioctl,
	.set_termios = moxa_set_termios,
	.stop = moxa_stop,
	.start = moxa_start,
	.hangup = moxa_hangup,
	.break_ctl = moxa_break_ctl,
	.tiocmget = moxa_tiocmget,
	.tiocmset = moxa_tiocmset,
};

static const struct tty_port_operations moxa_port_ops = {
	.carrier_raised = moxa_carrier_raised,
	.dtr_rts = moxa_dtr_rts,
	.shutdown = moxa_shutdown,
};

static struct tty_driver *moxaDriver;
static DEFINE_TIMER(moxaTimer, moxa_poll, 0, 0);

/*
 * HW init
 */

static int moxa_check_fw_model(struct moxa_board_conf *brd, u8 model)
{
	switch (brd->boardType) {
	case MOXA_BOARD_C218_ISA:
	case MOXA_BOARD_C218_PCI:
		if (model != 1)
			goto err;
		break;
	case MOXA_BOARD_CP204J:
		if (model != 3)
			goto err;
		break;
	default:
		if (model != 2)
			goto err;
		break;
	}
	return 0;
err:
	return -EINVAL;
}

static int moxa_check_fw(const void *ptr)
{
	const __le16 *lptr = ptr;

	if (*lptr != cpu_to_le16(0x7980))
		return -EINVAL;

	return 0;
}

static int moxa_load_bios(struct moxa_board_conf *brd, const u8 *buf,
		size_t len)
{
	void __iomem *baseAddr = brd->basemem;
	u16 tmp;

	writeb(HW_reset, baseAddr + Control_reg);	/* reset */
	msleep(10);
	memset_io(baseAddr, 0, 4096);
	memcpy_toio(baseAddr, buf, len);	/* download BIOS */
	writeb(0, baseAddr + Control_reg);	/* restart */

	msleep(2000);

	switch (brd->boardType) {
	case MOXA_BOARD_C218_ISA:
	case MOXA_BOARD_C218_PCI:
		tmp = readw(baseAddr + C218_key);
		if (tmp != C218_KeyCode)
			goto err;
		break;
	case MOXA_BOARD_CP204J:
		tmp = readw(baseAddr + C218_key);
		if (tmp != CP204J_KeyCode)
			goto err;
		break;
	default:
		tmp = readw(baseAddr + C320_key);
		if (tmp != C320_KeyCode)
			goto err;
		tmp = readw(baseAddr + C320_status);
		if (tmp != STS_init) {
			printk(KERN_ERR "MOXA: bios upload failed -- CPU/Basic "
					"module not found\n");
			return -EIO;
		}
		break;
	}

	return 0;
err:
	printk(KERN_ERR "MOXA: bios upload failed -- board not found\n");
	return -EIO;
}