x86, rdc321x: remove watchdog file

#

# Makefile for the RDC321x specific parts of the kernel

#

obj-$(CONFIG_X86_RDC321X)        := gpio.o platform.o wdt.o

obj-$(CONFIG_X86_RDC321X)        := gpio.o platform.o

/*

 * RDC321x watchdog driver

 *

 * Copyright (C) 2007 Florian Fainelli <florian@openwrt.org>

 *

 * This driver is highly inspired from the cpu5_wdt driver

 *

 * 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.

 *

 */

#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/types.h>

#include <linux/errno.h>

#include <linux/miscdevice.h>

#include <linux/fs.h>

#include <linux/init.h>

#include <linux/ioport.h>

#include <linux/timer.h>

#include <linux/completion.h>

#include <linux/jiffies.h>

#include <linux/platform_device.h>

#include <linux/watchdog.h>

#include <linux/io.h>

#include <linux/uaccess.h>

#include <asm/mach-rdc321x/rdc321x_defs.h>

#define RDC_WDT_MASK	0x80000000 /* Mask */

#define RDC_WDT_EN	0x00800000 /* Enable bit */

#define RDC_WDT_WTI	0x00200000 /* Generate CPU reset/NMI/WDT on timeout */

#define RDC_WDT_RST	0x00100000 /* Reset bit */

#define RDC_WDT_WIF	0x00040000 /* WDT IRQ Flag */

#define RDC_WDT_IRT	0x00000100 /* IRQ Routing table */

#define RDC_WDT_CNT	0x00000001 /* WDT count */

#define RDC_CLS_TMR	0x80003844 /* Clear timer */

#define RDC_WDT_INTERVAL	(HZ/10+1)

int nowayout = WATCHDOG_NOWAYOUT;

module_param(nowayout, int, 0);

MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

static int ticks = 1000;

/* some device data */

static struct {

	struct completion stop;

	volatile int running;

	struct timer_list timer;

	volatile int queue;

	int default_ticks;

	unsigned long inuse;

} rdc321x_wdt_device;

/* generic helper functions */

static void rdc321x_wdt_trigger(unsigned long unused)

{

	if (rdc321x_wdt_device.running)

		ticks--;

	/* keep watchdog alive */

	outl(RDC_WDT_EN|inl(RDC3210_CFGREG_DATA), RDC3210_CFGREG_DATA);

	/* requeue?? */

	if (rdc321x_wdt_device.queue && ticks)

		mod_timer(&rdc321x_wdt_device.timer,

				jiffies + RDC_WDT_INTERVAL);

	else {

		/* ticks doesn't matter anyway */

		complete(&rdc321x_wdt_device.stop);

	}

}

static void rdc321x_wdt_reset(void)

{

	ticks = rdc321x_wdt_device.default_ticks;

}

static void rdc321x_wdt_start(void)

{

	if (!rdc321x_wdt_device.queue) {

		rdc321x_wdt_device.queue = 1;

		/* Clear the timer */

		outl(RDC_CLS_TMR, RDC3210_CFGREG_ADDR);

		/* Enable watchdog and set the timeout to 81.92 us */

		outl(RDC_WDT_EN|RDC_WDT_CNT, RDC3210_CFGREG_DATA);

		mod_timer(&rdc321x_wdt_device.timer,

				jiffies + RDC_WDT_INTERVAL);

	}

	/* if process dies, counter is not decremented */

	rdc321x_wdt_device.running++;

}

static int rdc321x_wdt_stop(void)

{

	if (rdc321x_wdt_device.running)

		rdc321x_wdt_device.running = 0;

	ticks = rdc321x_wdt_device.default_ticks;

	return -EIO;

}

/* filesystem operations */

static int rdc321x_wdt_open(struct inode *inode, struct file *file)

{

	if (test_and_set_bit(0, &rdc321x_wdt_device.inuse))

		return -EBUSY;

	return nonseekable_open(inode, file);

}

static int rdc321x_wdt_release(struct inode *inode, struct file *file)

{

	clear_bit(0, &rdc321x_wdt_device.inuse);

	return 0;

}

static int rdc321x_wdt_ioctl(struct inode *inode, struct file *file,

				unsigned int cmd, unsigned long arg)

{

	void __user *argp = (void __user *)arg;

	unsigned int value;

	static struct watchdog_info ident = {

		.options = WDIOF_CARDRESET,

		.identity = "RDC321x WDT",

	};

	switch (cmd) {

	case WDIOC_KEEPALIVE:

		rdc321x_wdt_reset();

		break;

	case WDIOC_GETSTATUS:

		/* Read the value from the DATA register */

		value = inl(RDC3210_CFGREG_DATA);

		if (copy_to_user(argp, &value, sizeof(int)))

			return -EFAULT;

		break;

	case WDIOC_GETSUPPORT:

		if (copy_to_user(argp, &ident, sizeof(ident)))

			return -EFAULT;

		break;

	case WDIOC_SETOPTIONS:

		if (copy_from_user(&value, argp, sizeof(int)))

			return -EFAULT;

		switch (value) {

		case WDIOS_ENABLECARD:

			rdc321x_wdt_start();

			break;

		case WDIOS_DISABLECARD:

			return rdc321x_wdt_stop();

		default:

			return -EINVAL;

		}

		break;

	default:

		return -ENOTTY;

	}

	return 0;

}

static ssize_t rdc321x_wdt_write(struct file *file, const char __user *buf,

				size_t count, loff_t *ppos)

{

	if (!count)

		return -EIO;

	rdc321x_wdt_reset();

	return count;

}

static const struct file_operations rdc321x_wdt_fops = {

	.owner		= THIS_MODULE,

	.llseek		= no_llseek,

	.ioctl		= rdc321x_wdt_ioctl,

	.open		= rdc321x_wdt_open,

	.write		= rdc321x_wdt_write,

	.release	= rdc321x_wdt_release,

};

static struct miscdevice rdc321x_wdt_misc = {

	.minor	= WATCHDOG_MINOR,

	.name	= "watchdog",

	.fops	= &rdc321x_wdt_fops,

};

static int __devinit rdc321x_wdt_probe(struct platform_device *pdev)

{

	int err;

	err = misc_register(&rdc321x_wdt_misc);

	if (err < 0) {

		printk(KERN_ERR PFX "watchdog misc_register failed\n");

		return err;

	}

	/* Reset the watchdog */

	outl(RDC_WDT_RST, RDC3210_CFGREG_DATA);

	init_completion(&rdc321x_wdt_device.stop);

	rdc321x_wdt_device.queue = 0;

	clear_bit(0, &rdc321x_wdt_device.inuse);

	setup_timer(&rdc321x_wdt_device.timer, rdc321x_wdt_trigger, 0);

	rdc321x_wdt_device.default_ticks = ticks;

	printk(KERN_INFO PFX "watchdog init success\n");

	return 0;

}

static int rdc321x_wdt_remove(struct platform_device *pdev)

{

	if (rdc321x_wdt_device.queue) {

		rdc321x_wdt_device.queue = 0;

		wait_for_completion(&rdc321x_wdt_device.stop);

	}

	misc_deregister(&rdc321x_wdt_misc);

	return 0;

}

static struct platform_driver rdc321x_wdt_driver = {

	.probe = rdc321x_wdt_probe,

	.remove = rdc321x_wdt_remove,

	.driver = {

		.owner = THIS_MODULE,

		.name = "rdc321x-wdt",

	},

};

static int __init rdc321x_wdt_init(void)

{

	return platform_driver_register(&rdc321x_wdt_driver);

}

static void __exit rdc321x_wdt_exit(void)

{

	platform_driver_unregister(&rdc321x_wdt_driver);

}

module_init(rdc321x_wdt_init);

module_exit(rdc321x_wdt_exit);

MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");

MODULE_DESCRIPTION("RDC321x watchdog driver");

MODULE_LICENSE("GPL");

MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);