watchdog-reset.h

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/* arch/arm/plat-s3c/include/plat/watchdog-reset.h
 *
 * Copyright (c) 2008 Simtec Electronics
 *  Ben Dooks <[email protected]>
 *
 * S3C2410 - System define for arch_reset() function
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
*/

#include <plat/clock.h>
#include <plat/regs-watchdog.h>
#include <mach/map.h>

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

static inline void arch_wdt_reset(void)
{
    printk("arch_reset: attempting watchdog reset\n");

    __raw_writel(0, S3C2410_WTCON);   /* disable watchdog, to be safe  */

    if (!IS_ERR(s3c2410_wdtclk))
        clk_enable(s3c2410_wdtclk);

    /* put initial values into count and data */
    __raw_writel(0x80, S3C2410_WTCNT);
    __raw_writel(0x80, S3C2410_WTDAT);

    /* set the watchdog to go and reset... */
    __raw_writel(S3C2410_WTCON_ENABLE|S3C2410_WTCON_DIV16|S3C2410_WTCON_RSTEN |
             S3C2410_WTCON_PRESCALE(0x20), S3C2410_WTCON);

    /* 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);
}