board/w7o/watchdog.c

   1 /*
   2  * (C) Copyright 2001
   3  * Erik Theisen, Wave 7 Optics, etheisen@mindspring.com.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 /*
  25  * W7O board level hardware watchdog.
  26  */
  27 #include <common.h>
  28 #include <config.h>
  29
  30 #ifdef CONFIG_HW_WATCHDOG
  31 #include <watchdog.h>
  32
  33 void hw_watchdog_reset(void)
  34 {
  35     volatile ushort *hwd = (ushort *)(CFG_W7O_EBC_PB7CR & 0xfff00000);
  36
  37     /*
  38      * Read the LMG's hwd register and toggle the
  39      * watchdog bit to reset it.   On the LMC, just
  40      * reading it is enough, but toggling the bit
  41      * doen't hurt either.
  42      */
  43     *hwd = *hwd ^ 0x8000;
  44
  45 } /* hw_watchdog_reset() */
  46
  47 #endif /* CONFIG_HW_WATCHDOG */