LXR linux/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
  18static void __iomem *wdt_reg_base;
  19
  20static void ls1x_halt(void)
  21{
  22        while (1) {
  23                if (cpu_wait)
  24                        cpu_wait();
  25        }
  26}
  27
  28static 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
  37static void ls1x_power_off(void)
  38{
  39        ls1x_halt();
  40}
  41
  42static 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
  55arch_initcall(ls1x_reboot_setup);
  56