drivers/watchdog/bcm2835_wdt.c

   1 /*
   2  * Watchdog driver for Broadcom BCM2835
   3  *
   4  * Copyright (C) 2017 Paolo Pisati <p.pisati@gmail.com>
   5  *
   6  * SPDX-License-Identifier: GPL-2.0
   7  */
   8
   9 #include <common.h>
  10 #include <efi_loader.h>
  11 #include <asm/io.h>
  12 #include <asm/arch/wdog.h>
  13
  14 #define SECS_TO_WDOG_TICKS(x) ((x) << 16)
  15 #define MAX_TIMEOUT   0xf /* ~15s */
  16
  17 static __efi_runtime_data bool enabled = true;
  18
  19 extern void reset_cpu(ulong ticks);
  20
  21 void hw_watchdog_reset(void)
  22 {
  23         if (enabled)
  24                 reset_cpu(SECS_TO_WDOG_TICKS(MAX_TIMEOUT));
  25 }
  26
  27 void hw_watchdog_init(void)
  28 {
  29         hw_watchdog_reset();
  30 }
  31
  32 void __efi_runtime hw_watchdog_disable(void)
  33 {
  34         enabled = false;
  35 }