arch/mips/gt64120/momenco_ocelot/reset.c

   1 /*
   2  * This program is free software; you can redistribute  it and/or modify it
   3  * under  the terms of  the GNU General  Public License as published by the
   4  * Free Software Foundation;  either version 2 of the  License, or (at your
   5  * option) any later version.
   6  *
   7  * Copyright (C) 1997, 2001 Ralf Baechle
   8  * Copyright 2001 MontaVista Software Inc.
   9  * Author: jsun@mvista.com or jsun@junsun.net
  10  */
  11 #include <linux/sched.h>
  12 #include <linux/mm.h>
  13 #include <asm/io.h>
  14 #include <asm/pgtable.h>
  15 #include <asm/processor.h>
  16 #include <asm/reboot.h>
  17 #include <asm/system.h>
  18 #include <linux/delay.h>
  19
  20 void momenco_ocelot_restart(char *command)
  21 {
  22         void *nvram = ioremap_nocache(0x2c807000, 0x1000);
  23
  24         if (!nvram) {
  25                 printk(KERN_NOTICE "ioremap of reset register failed\n");
  26                 return;
  27         }
  28         writeb(0x84, nvram + 0xff7); /* Ask the NVRAM/RTC/watchdog chip to
  29                                         assert reset in 1/16 second */
  30         mdelay(10+(1000/16));
  31         iounmap(nvram);
  32         printk(KERN_NOTICE "Watchdog reset failed\n");
  33 }
  34
  35 void momenco_ocelot_halt(void)
  36 {
  37         printk(KERN_NOTICE "\n** You can safely turn off the power\n");
  38         while (1)
  39                 __asm__(".set\tmips3\n\t"
  40                         "wait\n\t"
  41                         ".set\tmips0");
  42 }
  43
  44 void momenco_ocelot_power_off(void)
  45 {
  46         momenco_ocelot_halt();
  47 }