arch/arm/cpu/arm920t/at91/reset.c

   1 /*
   2  * (C) Copyright 2002
   3  * Lineo, Inc. <www.lineo.com>
   4  * Bernhard Kuhn <bkuhn@lineo.com>
   5  *
   6  * (C) Copyright 2002
   7  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   8  * Marius Groeger <mgroeger@sysgo.de>
   9  *
  10  * (C) Copyright 2002
  11  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  12  * Alex Zuepke <azu@sysgo.de>
  13  *
  14  * See file CREDITS for list of people who contributed to this
  15  * project.
  16  *
  17  * This program is free software; you can redistribute it and/or
  18  * modify it under the terms of the GNU General Public License as
  19  * published by the Free Software Foundation; either version 2 of
  20  * the License, or (at your option) any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  30  * MA 02111-1307 USA
  31  */
  32
  33 #include <common.h>
  34 #include <asm/io.h>
  35 #include <asm/arch/hardware.h>
  36 #include <asm/arch/at91_st.h>
  37
  38 void  __attribute__((weak)) board_reset(void)
  39 {
  40         /* true empty function for defining weak symbol */
  41 }
  42
  43 void reset_cpu(ulong ignored)
  44 {
  45         at91_st_t *st = (at91_st_t *) ATMEL_BASE_ST;
  46
  47         board_reset();
  48
  49         /* Reset the cpu by setting up the watchdog timer */
  50         writel(AT91_ST_WDMR_RSTEN | AT91_ST_WDMR_EXTEN | AT91_ST_WDMR_WDV(2),
  51                 &st->wdmr);
  52         writel(AT91_ST_CR_WDRST, &st->cr);
  53         /* and let it timeout */
  54         while (1)
  55                 ;
  56         /* Never reached */
  57 }