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/sched.h>
  12 #include <linux/mm.h>
  13 #include <asm/cacheflush.h>
  14 #include <asm/io.h>
  15 #include <asm/processor.h>
  16 #include <asm/reboot.h>
  17 #include <asm/system.h>
  18 #include <asm/mipsregs.h>
  19 #include <asm/cobalt/cobalt.h>
  20
  21 void cobalt_machine_halt(void)
  22 {
  23         int state, last, diff;
  24         unsigned long mark;
  25
  26         /*
  27          * turn off bar on Qube, flash power off LED on RaQ (0.5Hz)
  28          *
  29          * restart if ENTER and SELECT are pressed
  30          */
  31
  32         last = COBALT_KEY_PORT;
  33
  34         for (state = 0;;) {
  35
  36                 state ^= COBALT_LED_POWER_OFF;
  37                 COBALT_LED_PORT = state;
  38
  39                 diff = COBALT_KEY_PORT ^ last;
  40                 last ^= diff;
  41
  42                 if((diff & (COBALT_KEY_ENTER | COBALT_KEY_SELECT)) && !(~last & (COBALT_KEY_ENTER | COBALT_KEY_SELECT)))
  43                         COBALT_LED_PORT = COBALT_LED_RESET;
  44
  45                 for (mark = jiffies; jiffies - mark < HZ;)
  46                         ;
  47         }
  48 }
  49
  50 void cobalt_machine_restart(char *command)
  51 {
  52         COBALT_LED_PORT = COBALT_LED_RESET;
  53
  54         /* we should never get here */
  55         cobalt_machine_halt();
  56 }
  57
  58 /*
  59  * This triggers the luser mode device driver for the power switch ;-)
  60  */
  61 void cobalt_machine_power_off(void)
  62 {
  63         printk("You can switch the machine off now.\n");
  64         cobalt_machine_halt();
  65 }