linux-imx

/*

 * drivers/char/watchdog/sp805-wdt.c

 *

 * Watchdog driver for ARM SP805 watchdog module

 *

 * Copyright (C) 2010 ST Microelectronics

 * Viresh Kumar <vireshk@kernel.org>

 *

 * This file is licensed under the terms of the GNU General Public

 * License version 2 or later. This program is licensed "as is" without any

 * warranty of any kind, whether express or implied.

 */

​

#include <linux/acpi.h>

#include <linux/device.h>

#include <linux/resource.h>

#include <linux/amba/bus.h>

#include <linux/bitops.h>

#include <linux/clk.h>

#include <linux/io.h>

#include <linux/ioport.h>

#include <linux/kernel.h>

#include <linux/math64.h>

#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/of.h>

#include <linux/pm.h>

#include <linux/slab.h>

#include <linux/spinlock.h>

#include <linux/types.h>

#include <linux/watchdog.h>

​

/* default timeout in seconds */

#define DEFAULT_TIMEOUT     60

​

#define MODULE_NAME     "sp805-wdt"

​

/* watchdog register offsets and masks */

#define WDTLOAD         0x000

    #define LOAD_MIN    0x00000001

    #define LOAD_MAX    0xFFFFFFFF

#define WDTVALUE        0x004

#define WDTCONTROL      0x008

    /* control register masks */

    #define INT_ENABLE  (1 << 0)

    #define RESET_ENABLE    (1 << 1)

    #define ENABLE_MASK (INT_ENABLE | RESET_ENABLE)

#define WDTINTCLR       0x00C

#define WDTRIS          0x010

#define WDTMIS          0x014

    #define INT_MASK    (1 << 0)

#define WDTLOCK         0xC00

    #define UNLOCK      0x1ACCE551

    #define LOCK        0x00000001

​

/**

 * struct sp805_wdt: sp805 wdt device structure

 * @wdd: instance of struct watchdog_device

 * @lock: spin lock protecting dev structure and io access

 * @base: base address of wdt

 * @clk: clock structure of wdt

 * @adev: amba device structure of wdt

 * @status: current status of wdt