LXR uboot/drivers/watchdog/ftwdt010

   1/*
   2 * Watchdog driver for the FTWDT010 Watch Dog Driver
   3 *
   4 * (c) Copyright 2004 Faraday Technology Corp. (www.faraday-tech.com)
   5 * Based on sa1100_wdt.c by Oleg Drokin <green@crimea.edu>
   6 * Based on SoftDog driver by Alan Cox <alan@redhat.com>
   7 *
   8 * Copyright (C) 2011 Andes Technology Corporation
   9 * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
  10 *
  11 * This program is free software; you can redistribute it and/or modify
  12 * it under the terms of the GNU General Public License as published by
  13 * the Free Software Foundation; either version 2 of the License, or
  14 * (at your option) any later version.
  15 *
  16 * This program is distributed in the hope that it will be useful,
  17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 * GNU General Public License for more details.
  20 *
  21 * You should have received a copy of the GNU General Public License
  22 * along with this program; if not, write to the Free Software
  23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24 *
  25 * 27/11/2004 Initial release, Faraday.
  26 * 12/01/2011 Port to u-boot, Macpaul Lin.
  27 */
  28
  29#include <common.h>
  30#include <watchdog.h>
  31#include <asm/io.h>
  32#include <faraday/ftwdt010_wdt.h>
  33
  34/*
  35 * Set the watchdog time interval.
  36 * Counter is 32 bit.
  37 */
  38int ftwdt010_wdt_settimeout(unsigned int timeout)
  39{
  40        unsigned int reg;
  41
  42        struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
  43
  44        debug("Activating WDT..\n");
  45
  46        /* Check if disabled */
  47        if (readl(&wd->wdcr) & ~FTWDT010_WDCR_ENABLE) {
  48                printf("sorry, watchdog is disabled\n");
  49                return -1;
  50        }
  51
  52        /*
  53         * In a 66MHz system,
  54         * if you set WDLOAD as 0x03EF1480 (66000000)
  55         * the reset timer is 1 second.
  56         */
  57        reg = FTWDT010_WDLOAD(timeout * FTWDT010_TIMEOUT_FACTOR);
  58
  59        writel(reg, &wd->wdload);
  60
  61        return 0;
  62}
  63
  64void ftwdt010_wdt_reset(void)
  65{
  66        struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
  67
  68        /* clear control register */
  69        writel(0, &wd->wdcr);
  70
  71        /* Write Magic number */
  72        writel(FTWDT010_WDRESTART_MAGIC, &wd->wdrestart);
  73
  74        /* Enable WDT */
  75        writel((FTWDT010_WDCR_RST | FTWDT010_WDCR_ENABLE), &wd->wdcr);
  76}
  77
  78void ftwdt010_wdt_disable(void)
  79{
  80        struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
  81
  82        debug("Deactivating WDT..\n");
  83
  84        /*
  85         * It was defined with CONFIG_WATCHDOG_NOWAYOUT in Linux
  86         *
  87         * Shut off the timer.
  88         * Lock it in if it's a module and we defined ...NOWAYOUT
  89         */
  90        writel(0, &wd->wdcr);
  91}
  92
  93#if defined(CONFIG_HW_WATCHDOG)
  94void hw_watchdog_reset(void)
  95{
  96        ftwdt010_wdt_reset();
  97}
  98
  99void hw_watchdog_init(void)
 100{
 101        /* set timer in ms */
 102        ftwdt010_wdt_settimeout(CONFIG_FTWDT010_HW_TIMEOUT * 1000);
 103}
 104#endif
 105