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/*
* Watchdog driver for the FTWDT010 Watch Dog Driver
*
* (c) Copyright 2004 Faraday Technology Corp. (www.faraday-tech.com)
* Based on sa1100_wdt.c by Oleg Drokin <green@crimea.edu>
* Based on SoftDog driver by Alan Cox <alan@redhat.com>
*
* Copyright (C) 2011 Andes Technology Corporation
* Macpaul Lin, Andes Technology Corporation <macpaul@andestech.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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* 27/11/2004 Initial release, Faraday.
* 12/01/2011 Port to u-boot, Macpaul Lin.
*/
#include <common.h>
#include <watchdog.h>
#include <asm/io.h>
#include <faraday/ftwdt010_wdt.h>
/*
* Set the watchdog time interval.
* Counter is 32 bit.
*/
int ftwdt010_wdt_settimeout(unsigned int timeout)
{
unsigned int reg;
struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
debug("Activating WDT..\n");
/* Check if disabled */
if (readl(&wd->wdcr) & ~FTWDT010_WDCR_ENABLE) {
printf("sorry, watchdog is disabled\n");
return -1;
}
/*
* In a 66MHz system,
* if you set WDLOAD as 0x03EF1480 (66000000)
* the reset timer is 1 second.
*/
reg = FTWDT010_WDLOAD(timeout * FTWDT010_TIMEOUT_FACTOR);
writel(reg, &wd->wdload);
return 0;
}
void ftwdt010_wdt_reset(void)
{
struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
/* clear control register */
writel(0, &wd->wdcr);
/* Write Magic number */
writel(FTWDT010_WDRESTART_MAGIC, &wd->wdrestart);
/* Enable WDT */
writel((FTWDT010_WDCR_RST | FTWDT010_WDCR_ENABLE), &wd->wdcr);
}
void ftwdt010_wdt_disable(void)
{
struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
debug("Deactivating WDT..\n");
/*
* It was defined with CONFIG_WATCHDOG_NOWAYOUT in Linux
*
* Shut off the timer.
* Lock it in if it's a module and we defined ...NOWAYOUT
*/
writel(0, &wd->wdcr);
}
#if defined(CONFIG_HW_WATCHDOG)
void hw_watchdog_reset(void)
{
ftwdt010_wdt_reset();
}
void hw_watchdog_init(void)
{
/* set timer in ms */
ftwdt010_wdt_settimeout(CONFIG_FTWDT010_HW_TIMEOUT * 1000);
}
#endif
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