linux-imx

/*

 *  IB700 Single Board Computer WDT driver

 *

 *  (c) Copyright 2001 Charles Howes <chowes@vsol.net>

 *

 *  Based on advantechwdt.c which is based on acquirewdt.c which

 *  is based on wdt.c.

 *

 *  (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>

 *

 *  Based on acquirewdt.c which is based on wdt.c.

 *  Original copyright messages:

 *

 *  (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,

 *                      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.

 *

 *  Neither Alan Cox nor CymruNet Ltd. admit liability nor provide

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

 *  "AS-IS" and at no charge.

 *

 *  (c) Copyright 1995    Alan Cox <alan@lxorguk.ukuu.org.uk>

 *

 *  14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>

 *       Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT

 *       Added timeout module option to override default

 *

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/module.h>

#include <linux/types.h>

#include <linux/miscdevice.h>

#include <linux/watchdog.h>

#include <linux/ioport.h>

#include <linux/fs.h>

#include <linux/init.h>

#include <linux/spinlock.h>

#include <linux/moduleparam.h>

#include <linux/platform_device.h>

#include <linux/io.h>

#include <linux/uaccess.h>

​

​

static struct platform_device *ibwdt_platform_device;

static unsigned long ibwdt_is_open;

static DEFINE_SPINLOCK(ibwdt_lock);

static char expect_close;

​

/* Module information */

#define DRV_NAME "ib700wdt"

​

/*

 *

 * Watchdog Timer Configuration

 *

 * The function of the watchdog timer is to reset the system

 * automatically and is defined at I/O port 0443H.  To enable the