LXR linux/arch/sh/kernel/idle.c

   1/*
   2 * The idle loop for all SuperH platforms.
   3 *
   4 *  Copyright (C) 2002 - 2009  Paul Mundt
   5 *
   6 * This file is subject to the terms and conditions of the GNU General Public
   7 * License.  See the file "COPYING" in the main directory of this archive
   8 * for more details.
   9 */
  10#include <linux/module.h>
  11#include <linux/init.h>
  12#include <linux/mm.h>
  13#include <linux/pm.h>
  14#include <linux/tick.h>
  15#include <linux/preempt.h>
  16#include <linux/thread_info.h>
  17#include <linux/irqflags.h>
  18#include <linux/smp.h>
  19#include <linux/cpuidle.h>
  20#include <linux/atomic.h>
  21#include <asm/pgalloc.h>
  22#include <asm/smp.h>
  23#include <asm/bl_bit.h>
  24
  25static void (*sh_idle)(void);
  26
  27void default_idle(void)
  28{
  29        set_bl_bit();
  30        local_irq_enable();
  31        /* Isn't this racy ? */
  32        cpu_sleep();
  33        clear_bl_bit();
  34}
  35
  36void arch_cpu_idle_dead(void)
  37{
  38        play_dead();
  39}
  40
  41void arch_cpu_idle(void)
  42{
  43        if (cpuidle_idle_call())
  44                sh_idle();
  45}
  46
  47void __init select_idle_routine(void)
  48{
  49        /*
  50         * If a platform has set its own idle routine, leave it alone.
  51         */
  52        if (!sh_idle)
  53                sh_idle = default_idle;
  54}
  55
  56void stop_this_cpu(void *unused)
  57{
  58        local_irq_disable();
  59        set_cpu_online(smp_processor_id(), false);
  60
  61        for (;;)
  62                cpu_sleep();
  63}
  64