linux-imx

/*

 *  SBC EPX C3 0.1  A Hardware Watchdog Device for the Winsystems EPX-C3

 *  single board computer

 *

 *  (c) Copyright 2006 Calin A. Culianu <calin@ajvar.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/ioport.h>

#include <linux/uaccess.h>

#include <linux/io.h>

​

static int epx_c3_alive;

​

#define WATCHDOG_TIMEOUT 1      /* 1 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) ")");

​

#define EPXC3_WATCHDOG_CTL_REG 0x1ee /* write 1 to enable, 0 to disable */

#define EPXC3_WATCHDOG_PET_REG 0x1ef /* write anything to pet once enabled */

​

static void epx_c3_start(void)

{

    outb(1, EPXC3_WATCHDOG_CTL_REG);

}

​

static void epx_c3_stop(void)

{

​

    outb(0, EPXC3_WATCHDOG_CTL_REG);

​

    pr_info("Stopped watchdog timer\n");

}

​

static void epx_c3_pet(void)

{

    outb(1, EPXC3_WATCHDOG_PET_REG);

}

​

/*