system.c

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/*
 * Copyright (C) 1999 ARM Limited
 * Copyright (C) 2000 Deep Blue Solutions Ltd
 * Copyright 2006-2007 Freescale Semiconductor, Inc. All Rights Reserved.
 * Copyright 2008 Juergen Beisert, [email protected]
 * Copyright 2009 Ilya Yanok, Emcraft Systems Ltd, [email protected]
 *
 * 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.
 */

#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/delay.h>

#include <mach/hardware.h>
#include <mach/common.h>
#include <asm/system_misc.h>
#include <asm/proc-fns.h>
#include <asm/mach-types.h>

static void __iomem *wdog_base;

/*
 * Reset the system. It is called by machine_restart().
 */
void mxc_restart(char mode, const char *cmd)
{
    unsigned int wcr_enable;

    if (cpu_is_mx1()) {
        wcr_enable = (1 << 0);
    } else {
        struct clk *clk;

        clk = clk_get_sys("imx2-wdt.0", NULL);
        if (!IS_ERR(clk))
            clk_prepare_enable(clk);
        wcr_enable = (1 << 2);
    }

    /* Assert SRS signal */
    __raw_writew(wcr_enable, wdog_base);

    /* wait for reset to assert... */
    mdelay(500);

    printk(KERN_ERR "Watchdog reset failed to assert reset\n");

    /* delay to allow the serial port to show the message */
    mdelay(50);

    /* we'll take a jump through zero as a poor second */
    soft_restart(0);
}

void mxc_arch_reset_init(void __iomem *base)
{
    wdog_base = base;
}