arch/mips/sgi-ip30/ip30-power.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * ip30-power.c: Software powerdown and reset handling for IP30 architecture.
   4  *
   5  * Copyright (C) 2004-2007 Stanislaw Skowronek <skylark@unaligned.org>
   6  *               2014 Joshua Kinard <kumba@gentoo.org>
   7  *               2009 Johannes Dickgreber <tanzy@gmx.de>
   8  */
   9
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/sched.h>
  14 #include <linux/notifier.h>
  15 #include <linux/delay.h>
  16 #include <linux/rtc/ds1685.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/pm.h>
  19
  20 #include <asm/reboot.h>
  21 #include <asm/sgi/heart.h>
  22
  23 static void __noreturn ip30_machine_restart(char *cmd)
  24 {
  25         /*
  26          * Execute HEART cold reset
  27          *   Yes, it's cold-HEARTed!
  28          */
  29         heart_write((heart_read(&heart_regs->mode) | HM_COLD_RST),
  30                     &heart_regs->mode);
  31         unreachable();
  32 }
  33
  34 static int __init ip30_reboot_setup(void)
  35 {
  36         _machine_restart = ip30_machine_restart;
  37
  38         return 0;
  39 }
  40
  41 subsys_initcall(ip30_reboot_setup);