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  * See file CREDITS for list of people who contributed to this
   8  * project.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License as
  12  * published by the Free Software Foundation; either version 2 of
  13  * the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  23  * MA 02111-1307 USA
  24  */
  25
  26 #include <common.h>
  27
  28 /*
  29  * Watchdog test
  30  *
  31  * The test verifies the watchdog timer operation.
  32  * On the first iteration, the test routine disables interrupts and
  33  * makes a 10-second delay. If the system does not reboot during this delay,
  34  * the watchdog timer is not operational and the test fails. If the system
  35  * reboots, on the second iteration the test routine reports a success.
  36  */
  37
  38 #include <post.h>
  39
  40 #if CONFIG_POST & CONFIG_SYS_POST_WATCHDOG
  41
  42 #include <watchdog.h>
  43
  44 int watchdog_post_test (int flags)
  45 {
  46         if (flags & POST_REBOOT) {
  47                 /* Test passed */
  48                 return 0;
  49         }
  50         else {
  51                 /* 10-second delay */
  52                 int ints = disable_interrupts ();
  53                 ulong base = post_time_ms (0);
  54
  55                 while (post_time_ms (base) < 10000)
  56                         ;
  57                 if (ints)
  58                         enable_interrupts ();
  59
  60                 /*
  61                  * If we have reached this point, the watchdog timer
  62                  * does not work
  63                  */
  64                 return -1;
  65         }
  66 }
  67
  68 #endif /* CONFIG_POST & CONFIG_SYS_POST_WATCHDOG */