linux-imx

/*

 *  w83627hf/thf WDT driver

 *

 *  (c) Copyright 2013 Guenter Roeck

 *      converted to watchdog infrastructure

 *

 *  (c) Copyright 2007 Vlad Drukker <vlad@storewiz.com>

 *      added support for W83627THF.

 *

 *  (c) Copyright 2003,2007 Pádraig Brady <P@draigBrady.com>

 *

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

 *  Original copyright messages:

 *

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

 *

 *  (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>

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/types.h>

#include <linux/watchdog.h>

#include <linux/ioport.h>

#include <linux/init.h>

#include <linux/io.h>

#include <linux/dmi.h>

​

#define WATCHDOG_NAME "w83627hf/thf/hg/dhg WDT"

#define WATCHDOG_TIMEOUT 60     /* 60 sec default timeout */

​

static int wdt_io;

static int cr_wdt_timeout;  /* WDT timeout register */

static int cr_wdt_control;  /* WDT control register */

static int cr_wdt_csr;      /* WDT control & status register */

static int wdt_cfg_enter = 0x87;/* key to unlock configuration space */

static int wdt_cfg_leave = 0xAA;/* key to lock configuration space */

​

enum chips { w83627hf, w83627s, w83697hf, w83697ug, w83637hf, w83627thf,

         w83687thf, w83627ehf, w83627dhg, w83627uhg, w83667hg, w83627dhg_p,

         w83667hg_b, nct6775, nct6776, nct6779, nct6791, nct6792, nct6793,

         nct6795, nct6796, nct6102 };

​

static int timeout;         /* in seconds */

module_param(timeout, int, 0);

MODULE_PARM_DESC(timeout,

        "Watchdog timeout in seconds. 1 <= timeout <= 255, default="

                __MODULE_STRING(WATCHDOG_TIMEOUT) ".");

​