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 <asm/idle.h>
  13 #include <asm/reboot.h>
  14
  15 #include <loongson1.h>
  16
  17 static void __iomem *wdt_base;
  18
  19 static void ls1x_halt(void)
  20 {
  21         while (1) {
  22                 if (cpu_wait)
  23                         cpu_wait();
  24         }
  25 }
  26
  27 static void ls1x_restart(char *command)
  28 {
  29         __raw_writel(0x1, wdt_base + WDT_EN);
  30         __raw_writel(0x1, wdt_base + WDT_TIMER);
  31         __raw_writel(0x1, wdt_base + WDT_SET);
  32
  33         ls1x_halt();
  34 }
  35
  36 static void ls1x_power_off(void)
  37 {
  38         ls1x_halt();
  39 }
  40
  41 static int __init ls1x_reboot_setup(void)
  42 {
  43         wdt_base = ioremap_nocache(LS1X_WDT_BASE, 0x0f);
  44         if (!wdt_base)
  45                 panic("Failed to remap watchdog registers");
  46
  47         _machine_restart = ls1x_restart;
  48         _machine_halt = ls1x_halt;
  49         pm_power_off = ls1x_power_off;
  50
  51         return 0;
  52 }
  53
  54 arch_initcall(ls1x_reboot_setup);