cpu/arm926ejs/mx25/reset.c

   1 /*
   2  * (C) Copyright 2002
   3  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   4  * Marius Groeger <mgroeger@sysgo.de>
   5  *
   6  * (C) Copyright 2002
   7  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   8  * Alex Zuepke <azu@sysgo.de>
   9  *
  10  * (C) Copyright 2002
  11  * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
  12  *
  13  * (C) Copyright 2009
  14  * Ilya Yanok, Emcraft Systems Ltd, <yanok@emcraft.com>
  15  *
  16  * See file CREDITS for list of people who contributed to this
  17  * project.
  18  *
  19  * This program is free software; you can redistribute it and/or
  20  * modify it under the terms of the GNU General Public License as
  21  * published by the Free Software Foundation; either version 2 of
  22  * the License, or (at your option) any later version.
  23  *
  24  * This program is distributed in the hope that it will be useful,
  25  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  * GNU General Public License for more details.
  28  *
  29  * You should have received a copy of the GNU General Public License
  30  * along with this program; if not, write to the Free Software
  31  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  32  * MA 02111-1307 USA
  33  */
  34
  35 #include <common.h>
  36 #include <asm/io.h>
  37 #include <asm/arch/imx-regs.h>
  38
  39 /*
  40  * Reset the cpu by setting up the watchdog timer and let it time out
  41  */
  42 void reset_cpu (ulong ignored)
  43 {
  44         struct wdog_regs *regs = (struct wdog_regs *)IMX_WDT_BASE;
  45         /* Disable watchdog and set Time-Out field to 0 */
  46         writel (0x00000000, &regs->wcr);
  47
  48         /* Write Service Sequence */
  49         writel (0x00005555, &regs->wsr);
  50         writel (0x0000AAAA, &regs->wsr);
  51
  52         /* Enable watchdog */
  53         writel (WCR_WDE, &regs->wcr);
  54
  55         while (1) ;
  56 }