arch/mips/cobalt/reset.c

   1 /*
   2  * Cobalt Reset operations
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (C) 1995, 1996, 1997 by Ralf Baechle
   9  * Copyright (C) 2001 by Liam Davies (ldavies@agile.tv)
  10  */
  11 #include <linux/init.h>
  12 #include <linux/jiffies.h>
  13 #include <linux/leds.h>
  14
  15 #include <cobalt.h>
  16
  17 DEFINE_LED_TRIGGER(power_off_led_trigger);
  18
  19 static int __init ledtrig_power_off_init(void)
  20 {
  21         led_trigger_register_simple("power-off", &power_off_led_trigger);
  22         return 0;
  23 }
  24 device_initcall(ledtrig_power_off_init);
  25
  26 void cobalt_machine_halt(void)
  27 {
  28         int state, last, diff;
  29         unsigned long mark;
  30
  31         /*
  32          * turn on power off LED on RaQ
  33          *
  34          * restart if ENTER and SELECT are pressed
  35          */
  36
  37         last = COBALT_KEY_PORT;
  38
  39         led_trigger_event(power_off_led_trigger, LED_FULL);
  40
  41         for (state = 0;;) {
  42                 diff = COBALT_KEY_PORT ^ last;
  43                 last ^= diff;
  44
  45                 if((diff & (COBALT_KEY_ENTER | COBALT_KEY_SELECT)) && !(~last & (COBALT_KEY_ENTER | COBALT_KEY_SELECT)))
  46                         COBALT_LED_PORT = COBALT_LED_RESET;
  47
  48                 for (mark = jiffies; jiffies - mark < HZ;)
  49                         ;
  50         }
  51 }
  52
  53 void cobalt_machine_restart(char *command)
  54 {
  55         COBALT_LED_PORT = COBALT_LED_RESET;
  56
  57         /* we should never get here */
  58         cobalt_machine_halt();
  59 }
  60
  61 /*
  62  * This triggers the luser mode device driver for the power switch ;-)
  63  */
  64 void cobalt_machine_power_off(void)
  65 {
  66         printk("You can switch the machine off now.\n");
  67         cobalt_machine_halt();
  68 }