LXR uboot/post/cpu/ppc4xx/watchdog.c

   1/*
   2 * (C) Copyright 2007
   3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4 *
   5 * Author: Igor Lisitsin <igor@emcraft.com>
   6 *
   7 * SPDX-License-Identifier:     GPL-2.0+
   8 */
   9
  10#include <common.h>
  11
  12/*
  13 * Watchdog test
  14 *
  15 * The test verifies the watchdog timer operation.
  16 * On the first iteration, the test routine disables interrupts and
  17 * makes a 10-second delay. If the system does not reboot during this delay,
  18 * the watchdog timer is not operational and the test fails. If the system
  19 * reboots, on the second iteration the test routine reports a success.
  20 */
  21
  22#include <post.h>
  23
  24#if CONFIG_POST & CONFIG_SYS_POST_WATCHDOG
  25
  26#include <watchdog.h>
  27
  28int watchdog_post_test (int flags)
  29{
  30        if (flags & POST_REBOOT) {
  31                /* Test passed */
  32                return 0;
  33        }
  34        else {
  35                /* 10-second delay */
  36                int ints = disable_interrupts ();
  37                ulong base = post_time_ms (0);
  38
  39                while (post_time_ms (base) < 10000)
  40                        ;
  41                if (ints)
  42                        enable_interrupts ();
  43
  44                /*
  45                 * If we have reached this point, the watchdog timer
  46                 * does not work
  47                 */
  48                return -1;
  49        }
  50}
  51
  52#endif /* CONFIG_POST & CONFIG_SYS_POST_WATCHDOG */
  53