linux-imx

/***************************************************************************

 *   Copyright (C) 2010-2012 Hans de Goede <hdegoede@redhat.com>           *

 *                                                                         *

 *   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.                                   *

 *                                                                         *

 *   This program is distributed in the hope that it will be useful,       *

 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *

 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *

 *   GNU General Public License for more details.                          *

 *                                                                         *

 *   You should have received a copy of the GNU General Public License     *

 *   along with this program; if not, write to the                         *

 *   Free Software Foundation, Inc.,                                       *

 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *

 ***************************************************************************/

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/module.h>

#include <linux/init.h>

#include <linux/platform_device.h>

#include <linux/err.h>

#include <linux/io.h>

#include <linux/acpi.h>

#include <linux/delay.h>

#include <linux/fs.h>

#include <linux/watchdog.h>

#include <linux/uaccess.h>

#include <linux/slab.h>

#include "sch56xx-common.h"

​

/* Insmod parameters */

static int nowayout = WATCHDOG_NOWAYOUT;

module_param(nowayout, int, 0);

MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="

    __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

​

#define SIO_SCH56XX_LD_EM   0x0C    /* Embedded uController Logical Dev */

#define SIO_UNLOCK_KEY      0x55    /* Key to enable Super-I/O */

#define SIO_LOCK_KEY        0xAA    /* Key to disable Super-I/O */

​

#define SIO_REG_LDSEL       0x07    /* Logical device select */

#define SIO_REG_DEVID       0x20    /* Device ID */

#define SIO_REG_ENABLE      0x30    /* Logical device enable */

#define SIO_REG_ADDR        0x66    /* Logical device address (2 bytes) */

​

#define SIO_SCH5627_ID      0xC6    /* Chipset ID */

#define SIO_SCH5636_ID      0xC7    /* Chipset ID */

​

#define REGION_LENGTH       10

​

#define SCH56XX_CMD_READ    0x02

#define SCH56XX_CMD_WRITE   0x03

​

/* Watchdog registers */

#define SCH56XX_REG_WDOG_PRESET     0x58B

#define SCH56XX_REG_WDOG_CONTROL    0x58C

#define SCH56XX_WDOG_TIME_BASE_SEC  0x01

#define SCH56XX_REG_WDOG_OUTPUT_ENABLE  0x58E

#define SCH56XX_WDOG_OUTPUT_ENABLE  0x02

​

struct sch56xx_watchdog_data {

    u16 addr;

    struct mutex *io_lock;

    struct watchdog_info wdinfo;

    struct watchdog_device wddev;

    u8 watchdog_preset;

    u8 watchdog_control;

    u8 watchdog_output_enable;

};

​

static struct platform_device *sch56xx_pdev;

​

/* Super I/O functions */

static inline int superio_inb(int base, int reg)

{

    outb(reg, base);

    return inb(base + 1);

}

​

static inline int superio_enter(int base)

{

    /* Don't step on other drivers' I/O space by accident */

    if (!request_muxed_region(base, 2, "sch56xx")) {

        pr_err("I/O address 0x%04x already in use\n", base);

        return -EBUSY;

    }

​

    outb(SIO_UNLOCK_KEY, base);