LXR uboot/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
  33void hw_watchdog_reset(void)
  34{
  35    volatile ushort *hwd = (ushort *)(CONFIG_SYS_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 */
  48