arch/mips/momentum/ocelot_c/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_ocelot_restart(char *command)
  28 {
  29         /* base address of timekeeper portion of part */
  30         void *nvram = (void *)
  31 #ifdef CONFIG_MIPS64
  32                 0xfffffffffc807000;
  33 #else
  34                 0xfc807000;
  35 #endif
  36
  37         /* Ask the NVRAM/RTC/watchdog chip to assert reset in 1/16 second */
  38         writeb(0x84, nvram + 0xff7);
  39
  40         /* wait for the watchdog to go off */
  41         mdelay(100+(1000/16));
  42
  43         /* if the watchdog fails for some reason, let people know */
  44         printk(KERN_NOTICE "Watchdog reset failed\n");
  45 }
  46
  47 void momenco_ocelot_halt(void)
  48 {
  49         printk(KERN_NOTICE "\n** You can safely turn off the power\n");
  50         while (1)
  51                 __asm__(".set\tmips3\n\t"
  52                         "wait\n\t"
  53                         ".set\tmips0");
  54 }
  55
  56 void momenco_ocelot_power_off(void)
  57 {
  58         momenco_ocelot_halt();
  59 }