arch/mips/mti-malta/malta-reset.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Carsten Langgaard, carstenl@mips.com
   7  * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
   8  */
   9 #include <linux/io.h>
  10 #include <linux/pm.h>
  11
  12 #include <asm/reboot.h>
  13 #include <asm/mach-malta/malta-pm.h>
  14
  15 #define SOFTRES_REG     0x1f000500
  16 #define GORESET         0x42
  17
  18 static void mips_machine_restart(char *command)
  19 {
  20         unsigned int __iomem *softres_reg =
  21                 ioremap(SOFTRES_REG, sizeof(unsigned int));
  22
  23         __raw_writel(GORESET, softres_reg);
  24 }
  25
  26 static void mips_machine_halt(void)
  27 {
  28         while (true);
  29 }
  30
  31 static void mips_machine_power_off(void)
  32 {
  33         mips_pm_suspend(PIIX4_FUNC3IO_PMCNTRL_SUS_TYP_SOFF);
  34
  35         pr_info("Failed to power down, resetting\n");
  36         mips_machine_restart(NULL);
  37 }
  38
  39 static int __init mips_reboot_setup(void)
  40 {
  41         _machine_restart = mips_machine_restart;
  42         _machine_halt = mips_machine_halt;
  43         pm_power_off = mips_machine_power_off;
  44
  45         return 0;
  46 }
  47 arch_initcall(mips_reboot_setup);