arch/mips/loongson32/common/reset.c

   1 /*
   2  * Copyright (c) 2011 Zhang, Keguang <keguang.zhang@gmail.com>
   3  *
   4  * This program is free software; you can redistribute  it and/or modify it
   5  * under  the terms of  the GNU General  Public License as published by the
   6  * Free Software Foundation;  either version 2 of the  License, or (at your
   7  * option) any later version.
   8  */
   9
  10 #include <linux/io.h>
  11 #include <linux/pm.h>
  12 #include <linux/sizes.h>
  13 #include <asm/idle.h>
  14 #include <asm/reboot.h>
  15
  16 #include <loongson1.h>
  17
  18 static void __iomem *wdt_reg_base;
  19
  20 static void ls1x_halt(void)
  21 {
  22         while (1) {
  23                 if (cpu_wait)
  24                         cpu_wait();
  25         }
  26 }
  27
  28 static void ls1x_restart(char *command)
  29 {
  30         __raw_writel(0x1, wdt_reg_base + WDT_EN);
  31         __raw_writel(0x1, wdt_reg_base + WDT_TIMER);
  32         __raw_writel(0x1, wdt_reg_base + WDT_SET);
  33
  34         ls1x_halt();
  35 }
  36
  37 static void ls1x_power_off(void)
  38 {
  39         ls1x_halt();
  40 }
  41
  42 static int __init ls1x_reboot_setup(void)
  43 {
  44         wdt_reg_base = ioremap_nocache(LS1X_WDT_BASE, (SZ_4 + SZ_8));
  45         if (!wdt_reg_base)
  46                 panic("Failed to remap watchdog registers");
  47
  48         _machine_restart = ls1x_restart;
  49         _machine_halt = ls1x_halt;
  50         pm_power_off = ls1x_power_off;
  51
  52         return 0;
  53 }
  54
  55 arch_initcall(ls1x_reboot_setup);