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
  20 void cobalt_machine_restart(char *command)
  21 {
  22         *(volatile char *)0xbc000000 = 0x0f;
  23
  24         /*
  25          * Ouch, we're still alive ... This time we take the silver bullet ...
  26          * ... and find that we leave the hardware in a state in which the
  27          * kernel in the flush locks up somewhen during of after the PCI
  28          * detection stuff.
  29          */
  30         set_c0_status(ST0_BEV | ST0_ERL);
  31         change_c0_config(CONF_CM_CMASK, CONF_CM_UNCACHED);
  32         flush_cache_all();
  33         write_c0_wired(0);
  34         __asm__ __volatile__(
  35                 "jr\t%0"
  36                 :
  37                 : "r" (0xbfc00000));
  38 }
  39
  40 extern int led_state;
  41 #define kLED            0xBC000000
  42 #define LEDSet(x)       (*(volatile unsigned char *) kLED) = (( unsigned char)x)
  43
  44 void cobalt_machine_halt(void)
  45 {
  46         int mark;
  47
  48         /* Blink our cute? little LED (number 3)... */
  49         while (1) {
  50                 led_state = led_state | ( 1 << 3 );
  51                 LEDSet(led_state);
  52                 mark = jiffies;
  53                 while (jiffies<(mark+HZ));
  54                 led_state = led_state & ~( 1 << 3 );
  55                 LEDSet(led_state);
  56                 mark = jiffies;
  57                 while (jiffies<(mark+HZ));
  58         }
  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 }