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/jiffies.h>
  12
  13 #include <asm/io.h>
  14 #include <asm/reboot.h>
  15
  16 #include <cobalt.h>
  17
  18 void cobalt_machine_halt(void)
  19 {
  20         int state, last, diff;
  21         unsigned long mark;
  22
  23         /*
  24          * turn off bar on Qube, flash power off LED on RaQ (0.5Hz)
  25          *
  26          * restart if ENTER and SELECT are pressed
  27          */
  28
  29         last = COBALT_KEY_PORT;
  30
  31         for (state = 0;;) {
  32
  33                 state ^= COBALT_LED_POWER_OFF;
  34                 COBALT_LED_PORT = state;
  35
  36                 diff = COBALT_KEY_PORT ^ last;
  37                 last ^= diff;
  38
  39                 if((diff & (COBALT_KEY_ENTER | COBALT_KEY_SELECT)) && !(~last & (COBALT_KEY_ENTER | COBALT_KEY_SELECT)))
  40                         COBALT_LED_PORT = COBALT_LED_RESET;
  41
  42                 for (mark = jiffies; jiffies - mark < HZ;)
  43                         ;
  44         }
  45 }
  46
  47 void cobalt_machine_restart(char *command)
  48 {
  49         COBALT_LED_PORT = COBALT_LED_RESET;
  50
  51         /* we should never get here */
  52         cobalt_machine_halt();
  53 }
  54
  55 /*
  56  * This triggers the luser mode device driver for the power switch ;-)
  57  */
  58 void cobalt_machine_power_off(void)
  59 {
  60         printk("You can switch the machine off now.\n");
  61         cobalt_machine_halt();
  62 }