/**
 *
 *   Copyright (C) 2006 AVM GmbH <fritzbox_info@avm.de>
 *
 *   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
 */
#if defined(CONFIG_AVM_WATCHDOG)
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/version.h>
#include <linux/init.h>
#include <asm/fcntl.h>
#include <asm/ioctl.h>
#include <asm/errno.h>
#include <asm/uaccess.h>
#if defined(CONFIG_MIPS_OHIO)
#include <asm/mips-boards/ohio.h>
#elif defined(CONFIG_MIPS_UR8)
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 32)
#include <asm/mach-ur8/ur8.h>
#else
#include <asm/mips-boards/ur8.h>
#endif
#endif
#include <linux/timer.h>
#include <linux/ar7wdt.h>
#if defined(CONFIG_ARCH_PUMA5) || defined(CONFIG_MACH_PUMA6)
#include <mach/hw_timer.h>
#endif/*--- #if defined(CONFIG_ARCH_PUMA5) ---*/
#include "avm_sammel.h"

// #define AVM_WATCHDOG_DEBUG

#if defined(AVM_WATCHDOG_DEBUG)
#define DBG(args...)  pr_info(args)
#else /*--- #if defined(AVM_WATCHDOG_DEBUG) ---*/
#define DBG(args...)	no_printk(args)
#endif	/*--- #else ---*/		 /*--- #if defined(AVM_WATCHDOG_DEBUG) ---*/

#if defined(CONFIG_MIPS_OHIO)
#define WDT_KICK_LOCK       (*(volatile unsigned int *)(OHIO_WDT_BASE + 0x00))
#define WDT_KICK            (*(volatile unsigned int *)(OHIO_WDT_BASE + 0x04))
#define WDT_CHANGE_LOCK     (*(volatile unsigned int *)(OHIO_WDT_BASE + 0x08))
#define WDT_CHANGE          (*(volatile unsigned int *)(OHIO_WDT_BASE + 0x0C))
#define WDT_DISABLE_LOCK    (*(volatile unsigned int *)(OHIO_WDT_BASE + 0x10))
#define WDT_DISABLE         (*(volatile unsigned int *)(OHIO_WDT_BASE + 0x14))
#define WDT_PRESCALE_LOCK   (*(volatile unsigned int *)(OHIO_WDT_BASE + 0x18))
#define WDT_PRESCALE        (*(volatile unsigned int *)(OHIO_WDT_BASE + 0x1C))
#elif defined(CONFIG_MIPS_UR8)
#define WDT_KICK_LOCK       (*(volatile unsigned int *)(UR8_WDT_BASE + 0x00))
#define WDT_KICK            (*(volatile unsigned int *)(UR8_WDT_BASE + 0x04))
#define WDT_CHANGE_LOCK     (*(volatile unsigned int *)(UR8_WDT_BASE + 0x08))
#define WDT_CHANGE          (*(volatile unsigned int *)(UR8_WDT_BASE + 0x0C))
#define WDT_DISABLE_LOCK    (*(volatile unsigned int *)(UR8_WDT_BASE + 0x10))
#define WDT_DISABLE         (*(volatile unsigned int *)(UR8_WDT_BASE + 0x14))
#define WDT_PRESCALE_LOCK   (*(volatile unsigned int *)(UR8_WDT_BASE + 0x18))
#define WDT_PRESCALE        (*(volatile unsigned int *)(UR8_WDT_BASE + 0x1C))
#elif defined(CONFIG_ARCH_PUMA5) || defined(CONFIG_MACH_PUMA6)
#define WDT_KICK_LOCK       (*(volatile unsigned int *)(PUMA_WDT_BASE + 0x00))
#define WDT_KICK            (*(volatile unsigned int *)(PUMA_WDT_BASE + 0x04))
#define WDT_CHANGE_LOCK     (*(volatile unsigned int *)(PUMA_WDT_BASE + 0x08))
#define WDT_CHANGE          (*(volatile unsigned int *)(PUMA_WDT_BASE + 0x0C))
#define WDT_DISABLE_LOCK    (*(volatile unsigned int *)(PUMA_WDT_BASE + 0x10))
#define WDT_DISABLE         (*(volatile unsigned int *)(PUMA_WDT_BASE + 0x14))
#define WDT_PRESCALE_LOCK   (*(volatile unsigned int *)(PUMA_WDT_BASE + 0x18))
#define WDT_PRESCALE        (*(volatile unsigned int *)(PUMA_WDT_BASE + 0x1C))
#endif

/**
 */
int ar7wdt_hw_is_wdt_running(void)
{
	return WDT_DISABLE == 0x1;
}

/**
 * dummy
 */
void ar7wdt_hw_secure_wdt_disable(void)
{
}

/**
 */
void ar7wdt_hw_init(void)
{
#ifdef CONFIG_MIPS_FUSIV
#else /*--- #ifdef CONFIG_MIPS_FUSIV ---*/
	unsigned int reg;

	reg = WDT_DISABLE;
	DBG("Watchdog disable reg = %08x\n", reg);
	reg = WDT_CHANGE;
	DBG("Watchdog change reg = %08x\n", reg);
	reg = WDT_PRESCALE;
	DBG("Watchdog prescale reg = %08x\n", reg);
	DBG("setting WDT\n");

	WDT_CHANGE_LOCK = 0x6666;
	WDT_CHANGE_LOCK = 0xBBBB;
	WDT_CHANGE = 0xABCD;
	WDT_PRESCALE_LOCK = 0x5A5A;
	WDT_PRESCALE_LOCK = 0xA5A5;
	WDT_PRESCALE = 0xAFFE;
	reg = WDT_CHANGE;
	DBG("Watchdog change reg = %08x\n", reg);
	reg = WDT_PRESCALE;
	DBG("Watchdog prescale reg = %08x\n", reg);

	DBG("starting WDT\n");
	WDT_DISABLE_LOCK = 0x7777;
	WDT_DISABLE_LOCK = 0xCCCC;
	WDT_DISABLE_LOCK = 0xDDDD;
	WDT_DISABLE = 0x1;

	reg = WDT_DISABLE;
	DBG("Watchdog disable reg = %08x\n", reg);
#endif	/*--- #else  ---*/		/*--- #ifdef CONFIG_MIPS_FUSIV ---*/
}

/**
 */
void ar7wdt_hw_deinit(void)
{
	DBG("stopping WDT\n");
#ifdef CONFIG_MIPS_FUSIV
#else /*--- #ifdef CONFIG_MIPS_FUSIV ---*/
	WDT_DISABLE_LOCK = 0x7777;
	WDT_DISABLE_LOCK = 0xCCCC;
	WDT_DISABLE_LOCK = 0xDDDD;
	WDT_DISABLE = 0x0;
#endif	/*--- #else  ---*/		/*--- #ifdef CONFIG_MIPS_FUSIV ---*/
}

/**
 */
void ar7wdt_hw_reboot(void)
{
	DBG("%s!!\n", __func__);
	panic("%s: watchdog expired\n", __func__);
}

/**
 */
void ar7wdt_hw_trigger(void)
{
	DBG("%s !!\n", __func__);

	if (!ar7wdt_hw_is_wdt_running()) {
		return;
	}
#ifdef CONFIG_MIPS_FUSIV
#else /*--- #ifdef CONFIG_MIPS_FUSIV ---*/
	WDT_KICK_LOCK = 0x5555;
	WDT_KICK_LOCK = 0xAAAA;
	WDT_KICK = 0xAAAA;
#endif	/*--- #else  ---*/		/*--- #ifdef CONFIG_MIPS_FUSIV ---*/
}

#endif /*--- #if defined(CONFIG_AVM_WATCHDOG) ---*/