u-boot/cpu/arm926ejs/mx27/reset.c

/*
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <mgroeger@sysgo.de>
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Alex Zuepke <azu@sysgo.de>
 *
 * (C) Copyright 2002
 * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
 *
 * (C) Copyright 2009
 * Ilya Yanok, Emcraft Systems Ltd, <yanok@emcraft.com>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <asm/io.h>
#include <asm/arch/imx-regs.h>

/*
 * Reset the cpu by setting up the watchdog timer and let it time out
 */
void reset_cpu (ulong ignored)
{
	struct wdog_regs *regs = (struct wdog_regs *)IMX_WDT_BASE;
	/* Disable watchdog and set Time-Out field to 0 */
	writel(0x00000000, &regs->wcr);

	/* Write Service Sequence */
	writel(0x00005555, &regs->wsr);
	writel(0x0000AAAA, &regs->wsr);

	/* Enable watchdog */
	writel(WCR_WDE, &regs->wcr);

	while (1);
	/*NOTREACHED*/
}