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reset.c

/*
 * Cobalt Reset operations
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1995, 1996, 1997 by Ralf Baechle
 * Copyright (C) 2001 by Liam Davies (ldavies@agile.tv)
 */
#include <linux/init.h>
#include <linux/io.h>
#include <linux/jiffies.h>
#include <linux/leds.h>

#include <cobalt.h>

#define RESET_PORT      ((void __iomem *)CKSEG1ADDR(0x1c000000))
#define RESET           0x0f

DEFINE_LED_TRIGGER(power_off_led_trigger);

static int __init ledtrig_power_off_init(void)
{
      led_trigger_register_simple("power-off", &power_off_led_trigger);
      return 0;
}
device_initcall(ledtrig_power_off_init);

void cobalt_machine_halt(void)
{
      int state, last, diff;
      unsigned long mark;

      /*
       * turn on power off LED on RaQ
       *
       * restart if ENTER and SELECT are pressed
       */

      last = COBALT_KEY_PORT;

      led_trigger_event(power_off_led_trigger, LED_FULL);

      for (state = 0;;) {
            diff = COBALT_KEY_PORT ^ last;
            last ^= diff;

            if((diff & (COBALT_KEY_ENTER | COBALT_KEY_SELECT)) && !(~last & (COBALT_KEY_ENTER | COBALT_KEY_SELECT)))
                  writeb(RESET, RESET_PORT);

            for (mark = jiffies; jiffies - mark < HZ;)
                  ;
      }
}

void cobalt_machine_restart(char *command)
{
      writeb(RESET, RESET_PORT);

      /* we should never get here */
      cobalt_machine_halt();
}

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