Commit 04bf3b4f authored by Florian Fainelli's avatar Florian Fainelli Committed by Wim Van Sebroeck
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[WATCHDOG] MTX-1 Watchdog driver 



This patch adds support for the MTX-1 boards watchdog. If not available the
board will reboot every 100 seconds. It uses the Linux watchdog and timer
APIs.

Signed-off-by: default avatarFlorian Fainelli <florian.fainelli@int-evry.fr>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent 62be0741

drivers/char/watchdog/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -551,6 +551,13 @@ config INDYDOG 
	  timer expired and no process has written to /dev/watchdog during

	  that time.



config WDT_MTX1

	tristate "MTX-1 Hardware Watchdog"

	depends on MIPS_MTX1

	help

	  Hardware driver for the MTX-1 boards. This is a watchdog timer that

	  will reboot the machine after a 100 seconds timer expired.



config WDT_RM9K_GPI

	tristate "RM9000/GPI hardware watchdog"

	depends on CPU_RM9000

drivers/char/watchdog/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -72,6 +72,7 @@ obj-$(CONFIG_WATCHDOG_RTAS) += wdrtas.o 


# MIPS Architecture

obj-$(CONFIG_INDYDOG) += indydog.o

obj-$(CONFIG_WDT_MTX1)	+= mtx-1_wdt.o

obj-$(CONFIG_WDT_RM9K_GPI) += rm9k_wdt.o



# S390 Architecture

drivers/char/watchdog/mtx-1_wdt.c

0 → 100644
+238 −0
Original line number Diff line number Diff line 
/*

 *      Driver for the MTX-1 Watchdog.

 *

 *      (C) Copyright 2005 4G Systems <info@4g-systems.biz>, All Rights Reserved.

 *                              http://www.4g-systems.biz

 *

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

 *

 *      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.

 *

 *      Neither Michael Stickel nor 4G Systems admit liability nor provide

 *      warranty for any of this software. This material is provided

 *      "AS-IS" and at no charge.

 *

 *      (c) Copyright 2005    4G Systems <info@4g-systems.biz>

 *

 *      Release 0.01.

 *      Author: Michael Stickel  michael.stickel@4g-systems.biz

 *

 *      Release 0.02.

 *	Author: Florian Fainelli florian@openwrt.org

 *		use the Linux watchdog/timer APIs

 *

 *      The Watchdog is configured to reset the MTX-1

 *      if it is not triggered for 100 seconds.

 *      It should not be triggered more often than 1.6 seconds.

 *

 *      A timer triggers the watchdog every 5 seconds, until

 *      it is opened for the first time. After the first open

 *      it MUST be triggered every 2..95 seconds.

 */



#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/watchdog.h>

#include <asm/io.h>

#include <asm/uaccess.h>



#include <asm/mach-au1x00/au1000.h>



#define MTX1_WDT_INTERVAL	(5 * HZ)



static int ticks = 100 * HZ;



static struct {

	struct completion stop;

	volatile int running;

	struct timer_list timer;

	volatile int queue;

	int default_ticks;

	unsigned long inuse;

} mtx1_wdt_device;



static void mtx1_wdt_trigger(unsigned long unused)

{

	u32 tmp;



	if (mtx1_wdt_device.running)

		ticks--;

	/*

	 * toggle GPIO2_15

	 */

	tmp = au_readl(GPIO2_DIR);

	tmp = (tmp & ~(1<<15)) | ((~tmp) & (1<<15));

	au_writel (tmp, GPIO2_DIR);



	if (mtx1_wdt_device.queue && ticks)

		mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL);

	else {

		complete(&mtx1_wdt_device.stop);

	}

}



static void mtx1_wdt_reset(void)

{

	ticks = mtx1_wdt_device.default_ticks;

}





static void mtx1_wdt_start(void)

{

	if (!mtx1_wdt_device.queue) {

		mtx1_wdt_device.queue = 1;

		au_writel (au_readl(GPIO2_DIR) | (u32)(1<<15), GPIO2_DIR);

		mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL);

	}

	mtx1_wdt_device.running++;

}



static int mtx1_wdt_stop(void)

{

	if (mtx1_wdt_device.queue) {

		mtx1_wdt_device.queue = 0;

		au_writel (au_readl(GPIO2_DIR) & ~((u32)(1<<15)), GPIO2_DIR);

	}



	ticks = mtx1_wdt_device.default_ticks;



	return 0;

}



/* Filesystem functions */



static int mtx1_wdt_open(struct inode *inode, struct file *file)

{

	if (test_and_set_bit(0, &mtx1_wdt_device.inuse))

		return -EBUSY;



	return nonseekable_open(inode, file);

}





static int mtx1_wdt_release(struct inode *inode, struct file *file)

{

	clear_bit(0, &mtx1_wdt_device.inuse);

	return 0;

}



static int mtx1_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 = "MTX-1 WDT",

	};



	switch(cmd) {

		case WDIOC_KEEPALIVE:

			mtx1_wdt_reset();

			break;

		case WDIOC_GETSTATUS:

			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:

					mtx1_wdt_start();

					break;

				case WDIOS_DISABLECARD:

					return mtx1_wdt_stop();

				default:

					return -EINVAL;

			}

			break;

		default:

			return -ENOTTY;

	}

	return 0;

}





static ssize_t mtx1_wdt_write(struct file *file, const char *buf, size_t count, loff_t *ppos)

{

	if (!count)

		return -EIO;



	mtx1_wdt_reset();

	return count;

}



static struct file_operations mtx1_wdt_fops = {

	.owner 		= THIS_MODULE,

	.llseek		= no_llseek,

	.ioctl		= mtx1_wdt_ioctl,

	.open 		= mtx1_wdt_open,

	.write 		= mtx1_wdt_write,

	.release 	= mtx1_wdt_release

};





static struct miscdevice mtx1_wdt_misc = {

	.minor 	= WATCHDOG_MINOR,

	.name 	= "watchdog",

	.fops 	= &mtx1_wdt_fops

};





static int __init mtx1_wdt_init(void)

{

	int ret;



	if ((ret = misc_register(&mtx1_wdt_misc)) < 0) {

		printk(KERN_ERR " mtx-1_wdt : failed to register\n");

		return ret;

	}



	init_completion(&mtx1_wdt_device.stop);

	mtx1_wdt_device.queue = 0;



	clear_bit(0, &mtx1_wdt_device.inuse);



	setup_timer(&mtx1_wdt_device.timer, mtx1_wdt_trigger, 0L);



	mtx1_wdt_device.default_ticks = ticks;



	mtx1_wdt_start();



	printk(KERN_INFO "MTX-1 Watchdog driver\n");



	return 0;

}



static void __exit mtx1_wdt_exit(void)

{

	if (mtx1_wdt_device.queue) {

		mtx1_wdt_device.queue = 0;

		wait_for_completion(&mtx1_wdt_device.stop);

	}

	misc_deregister(&mtx1_wdt_misc);

}



module_init(mtx1_wdt_init);

module_exit(mtx1_wdt_exit);



MODULE_AUTHOR("Michael Stickel, Florian Fainelli");

MODULE_DESCRIPTION("Driver for the MTX-1 watchdog");

MODULE_LICENSE("GPL");

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