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
  28 int 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 */