68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
/*
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* Copyright (C) 1999 ARM Limited
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* Copyright (C) 2000 Deep Blue Solutions Ltd
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* Copyright 2006-2007 Freescale Semiconductor, Inc. All Rights Reserved.
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* Copyright 2008 Juergen Beisert, kernel@pengutronix.de
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* Copyright 2009 Ilya Yanok, Emcraft Systems Ltd, yanok@emcraft.com
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/err.h>
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#include <linux/delay.h>
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#include <mach/hardware.h>
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#include <asm/proc-fns.h>
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#include <asm/system.h>
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#ifdef CONFIG_ARCH_MX1
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#define WDOG_WCR_REG IO_ADDRESS(WDT_BASE_ADDR)
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#define WDOG_WCR_ENABLE (1 << 0)
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#else
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#define WDOG_WCR_REG IO_ADDRESS(WDOG_BASE_ADDR)
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#define WDOG_WCR_ENABLE (1 << 2)
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#endif
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/*
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* Reset the system. It is called by machine_restart().
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*/
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void arch_reset(char mode, const char *cmd)
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{
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if (!cpu_is_mx1()) {
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struct clk *clk;
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clk = clk_get_sys("imx-wdt.0", NULL);
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if (!IS_ERR(clk))
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clk_enable(clk);
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}
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/* Assert SRS signal */
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__raw_writew(WDOG_WCR_ENABLE, WDOG_WCR_REG);
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/* wait for reset to assert... */
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mdelay(500);
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printk(KERN_ERR "Watchdog reset failed to assert reset\n");
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/* delay to allow the serial port to show the message */
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mdelay(50);
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/* we'll take a jump through zero as a poor second */
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cpu_reset(0);
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}
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