linux/drivers/cpuidle/cpuidle-exynos.c
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   1/* linux/arch/arm/mach-exynos/cpuidle.c
   2 *
   3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   4 *              http://www.samsung.com
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9*/
  10
  11#include <linux/cpuidle.h>
  12#include <linux/cpu_pm.h>
  13#include <linux/export.h>
  14#include <linux/module.h>
  15#include <linux/platform_device.h>
  16
  17#include <asm/proc-fns.h>
  18#include <asm/suspend.h>
  19#include <asm/cpuidle.h>
  20
  21static void (*exynos_enter_aftr)(void);
  22
  23static int exynos_enter_lowpower(struct cpuidle_device *dev,
  24                                struct cpuidle_driver *drv,
  25                                int index)
  26{
  27        int new_index = index;
  28
  29        /* AFTR can only be entered when cores other than CPU0 are offline */
  30        if (num_online_cpus() > 1 || dev->cpu != 0)
  31                new_index = drv->safe_state_index;
  32
  33        if (new_index == 0)
  34                return arm_cpuidle_simple_enter(dev, drv, new_index);
  35
  36        exynos_enter_aftr();
  37
  38        return new_index;
  39}
  40
  41static struct cpuidle_driver exynos_idle_driver = {
  42        .name                   = "exynos_idle",
  43        .owner                  = THIS_MODULE,
  44        .states = {
  45                [0] = ARM_CPUIDLE_WFI_STATE,
  46                [1] = {
  47                        .enter                  = exynos_enter_lowpower,
  48                        .exit_latency           = 300,
  49                        .target_residency       = 100000,
  50                        .name                   = "C1",
  51                        .desc                   = "ARM power down",
  52                },
  53        },
  54        .state_count = 2,
  55        .safe_state_index = 0,
  56};
  57
  58static int exynos_cpuidle_probe(struct platform_device *pdev)
  59{
  60        int ret;
  61
  62        exynos_enter_aftr = (void *)(pdev->dev.platform_data);
  63
  64        ret = cpuidle_register(&exynos_idle_driver, NULL);
  65        if (ret) {
  66                dev_err(&pdev->dev, "failed to register cpuidle driver\n");
  67                return ret;
  68        }
  69
  70        return 0;
  71}
  72
  73static struct platform_driver exynos_cpuidle_driver = {
  74        .probe  = exynos_cpuidle_probe,
  75        .driver = {
  76                .name = "exynos_cpuidle",
  77        },
  78};
  79
  80module_platform_driver(exynos_cpuidle_driver);
  81
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