drivers/watchdog/ftwdt010_wdt.c

   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  * SPDX-License-Identifier:     GPL-2.0+
  12  *
  13  * 27/11/2004 Initial release, Faraday.
  14  * 12/01/2011 Port to u-boot, Macpaul Lin.
  15  */
  16
  17 #include <common.h>
  18 #include <watchdog.h>
  19 #include <asm/io.h>
  20 #include <faraday/ftwdt010_wdt.h>
  21
  22 /*
  23  * Set the watchdog time interval.
  24  * Counter is 32 bit.
  25  */
  26 int ftwdt010_wdt_settimeout(unsigned int timeout)
  27 {
  28         unsigned int reg;
  29
  30         struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
  31
  32         debug("Activating WDT..\n");
  33
  34         /* Check if disabled */
  35         if (readl(&wd->wdcr) & ~FTWDT010_WDCR_ENABLE) {
  36                 printf("sorry, watchdog is disabled\n");
  37                 return -1;
  38         }
  39
  40         /*
  41          * In a 66MHz system,
  42          * if you set WDLOAD as 0x03EF1480 (66000000)
  43          * the reset timer is 1 second.
  44          */
  45         reg = FTWDT010_WDLOAD(timeout * FTWDT010_TIMEOUT_FACTOR);
  46
  47         writel(reg, &wd->wdload);
  48
  49         return 0;
  50 }
  51
  52 void ftwdt010_wdt_reset(void)
  53 {
  54         struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
  55
  56         /* clear control register */
  57         writel(0, &wd->wdcr);
  58
  59         /* Write Magic number */
  60         writel(FTWDT010_WDRESTART_MAGIC, &wd->wdrestart);
  61
  62         /* Enable WDT */
  63         writel((FTWDT010_WDCR_RST | FTWDT010_WDCR_ENABLE), &wd->wdcr);
  64 }
  65
  66 void ftwdt010_wdt_disable(void)
  67 {
  68         struct ftwdt010_wdt *wd = (struct ftwdt010_wdt *)CONFIG_FTWDT010_BASE;
  69
  70         debug("Deactivating WDT..\n");
  71
  72         /*
  73          * It was defined with CONFIG_WATCHDOG_NOWAYOUT in Linux
  74          *
  75          * Shut off the timer.
  76          * Lock it in if it's a module and we defined ...NOWAYOUT
  77          */
  78         writel(0, &wd->wdcr);
  79 }
  80
  81 #if defined(CONFIG_HW_WATCHDOG)
  82 void hw_watchdog_reset(void)
  83 {
  84         ftwdt010_wdt_reset();
  85 }
  86
  87 void hw_watchdog_init(void)
  88 {
  89         /* set timer in ms */
  90         ftwdt010_wdt_settimeout(CONFIG_FTWDT010_HW_TIMEOUT * 1000);
  91 }
  92 #endif