linux-imx

/*

 *  IndyDog 0.3 A Hardware Watchdog Device for SGI IP22

 *

 *  (c) Copyright 2002 Guido Guenther <agx@sigxcpu.org>,

 *                      All Rights Reserved.

 *

 *  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.

 *

 *  based on softdog.c by Alan Cox <alan@lxorguk.ukuu.org.uk>

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/fs.h>

#include <linux/mm.h>

#include <linux/miscdevice.h>

#include <linux/watchdog.h>

#include <linux/notifier.h>

#include <linux/reboot.h>

#include <linux/init.h>

#include <linux/uaccess.h>

#include <asm/sgi/mc.h>

​

static unsigned long indydog_alive;

static DEFINE_SPINLOCK(indydog_lock);

​

#define WATCHDOG_TIMEOUT 30     /* 30 sec default timeout */

​

static bool nowayout = WATCHDOG_NOWAYOUT;

module_param(nowayout, bool, 0);

MODULE_PARM_DESC(nowayout,

        "Watchdog cannot be stopped once started (default="

                __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

​

static void indydog_start(void)

{

    spin_lock(&indydog_lock);

    sgimc->cpuctrl0 |= SGIMC_CCTRL0_WDOG;

    spin_unlock(&indydog_lock);

}

​

static void indydog_stop(void)

{

    spin_lock(&indydog_lock);

    sgimc->cpuctrl0 &= ~SGIMC_CCTRL0_WDOG;

    spin_unlock(&indydog_lock);

​

    pr_info("Stopped watchdog timer\n");

}

​

static void indydog_ping(void)

{

    sgimc->watchdogt = 0;

}

​

/*