arch/mips/momentum/jaguar_atx/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  * Copyright (C) 2002 Momentum Computer Inc.
  12  * Author: Matthew Dharm <mdharm@momenco.com>
  13  *
  14  * Louis Hamilton, Red Hat, Inc.
  15  * hamilton@redhat.com  [MIPS64 modifications]
  16  */
  17 #include <linux/config.h>
  18 #include <linux/sched.h>
  19 #include <linux/mm.h>
  20 #include <asm/io.h>
  21 #include <asm/pgtable.h>
  22 #include <asm/processor.h>
  23 #include <asm/reboot.h>
  24 #include <asm/system.h>
  25 #include <linux/delay.h>
  26
  27 void momenco_jaguar_restart(char *command)
  28 {
  29         /* base address of timekeeper portion of part */
  30 #ifdef CONFIG_MIPS64
  31         void *nvram = (void*) 0xfffffffffc807000;
  32 #else
  33         void *nvram = (void*) 0xfc807000;
  34 #endif
  35         /* Ask the NVRAM/RTC/watchdog chip to assert reset in 1/16 second */
  36         writeb(0x84, nvram + 0xff7);
  37
  38         /* wait for the watchdog to go off */
  39         mdelay(100+(1000/16));
  40
  41         /* if the watchdog fails for some reason, let people know */
  42         printk(KERN_NOTICE "Watchdog reset failed\n");
  43 }
  44
  45 void momenco_jaguar_halt(void)
  46 {
  47         printk(KERN_NOTICE "\n** You can safely turn off the power\n");
  48         while (1)
  49                 __asm__(".set\tmips3\n\t"
  50                         "wait\n\t"
  51                         ".set\tmips0");
  52 }
  53
  54 void momenco_jaguar_power_off(void)
  55 {
  56         momenco_jaguar_halt();
  57 }