diff options
Diffstat (limited to 'drivers/watchdog/ftwdt010_wdt.c')
| -rw-r--r-- | drivers/watchdog/ftwdt010_wdt.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/drivers/watchdog/ftwdt010_wdt.c b/drivers/watchdog/ftwdt010_wdt.c new file mode 100644 index 0000000..6e0617b --- /dev/null +++ b/drivers/watchdog/ftwdt010_wdt.c @@ -0,0 +1,102 @@ +/* + * 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 "ftwdt010_wdt.h" + +/* + * Set the watchdog time interval. + * Counter is 32 bit. + */ +static 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() +{ + 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() +{ + 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); +} + +void hw_watchdog_reset() +{ + ftwdt010_wdt_reset(); +} + +void hw_watchdog_init(void) +{ + /* set timer in ms */ + ftwdt010_wdt_settimeout(CONFIG_FTWDT010_HW_TIMEOUT * 1000); +} |