linux-imx

/*

 * MixCom Watchdog: A Simple Hardware Watchdog Device

 * Based on Softdog driver by Alan Cox and PC Watchdog driver by Ken Hollis

 *

 * Author: Gergely Madarasz <gorgo@itc.hu>

 *

 * Copyright (c) 1999 ITConsult-Pro Co. <info@itc.hu>

 *

 * 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.

 *

 * Version 0.1 (99/04/15):

 *      - first version

 *

 * Version 0.2 (99/06/16):

 *      - added kernel timer watchdog ping after close

 *        since the hardware does not support watchdog shutdown

 *

 * Version 0.3 (99/06/21):

 *      - added WDIOC_GETSTATUS and WDIOC_GETSUPPORT ioctl calls

 *

 * Version 0.3.1 (99/06/22):

 *      - allow module removal while internal timer is active,

 *        print warning about probable reset

 *

 * Version 0.4 (99/11/15):

 *      - support for one more type board

 *

 * Version 0.5 (2001/12/14) Matt Domsch <Matt_Domsch@dell.com>

 *      - added nowayout module option to override

 *        CONFIG_WATCHDOG_NOWAYOUT

 *

 * Version 0.6 (2002/04/12): Rob Radez <rob@osinvestor.com>

 *      - make mixcomwd_opened unsigned,

 *        removed lock_kernel/unlock_kernel from mixcomwd_release,

 *        modified ioctl a bit to conform to API

 *

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#define VERSION "0.6"

#define WATCHDOG_NAME "mixcomwd"

​

#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/types.h>

#include <linux/miscdevice.h>

#include <linux/ioport.h>

#include <linux/watchdog.h>

#include <linux/fs.h>

#include <linux/reboot.h>

#include <linux/init.h>

#include <linux/jiffies.h>

#include <linux/timer.h>

#include <linux/uaccess.h>

#include <linux/io.h>

​

/*

 * We have two types of cards that can be probed:

 * 1) The Mixcom cards: these cards can be found at addresses