linux-imx

/*

 * Copyright (c) 2011-2014 Samsung Electronics Co., Ltd.

 *      http://www.samsung.com

 *

 * Coupled cpuidle support based on the work of:

 *  Colin Cross <ccross@android.com>

 *  Daniel Lezcano <daniel.lezcano@linaro.org>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

*/

​

#include <linux/cpuidle.h>

#include <linux/cpu_pm.h>

#include <linux/export.h>

#include <linux/init.h>

#include <linux/platform_device.h>

#include <linux/of.h>

#include <linux/platform_data/cpuidle-exynos.h>

​

#include <asm/suspend.h>

#include <asm/cpuidle.h>

​

static atomic_t exynos_idle_barrier;

​

static struct cpuidle_exynos_data *exynos_cpuidle_pdata;

static void (*exynos_enter_aftr)(void);

​

static int exynos_enter_coupled_lowpower(struct cpuidle_device *dev,

                     struct cpuidle_driver *drv,

                     int index)

{

    int ret;

​

    exynos_cpuidle_pdata->pre_enter_aftr();

​

    /*

     * Waiting all cpus to reach this point at the same moment

     */

    cpuidle_coupled_parallel_barrier(dev, &exynos_idle_barrier);

​

    /*

     * Both cpus will reach this point at the same time

     */

    ret = dev->cpu ? exynos_cpuidle_pdata->cpu1_powerdown()

               : exynos_cpuidle_pdata->cpu0_enter_aftr();

    if (ret)

        index = ret;

​

    /*

     * Waiting all cpus to finish the power sequence before going further

     */

    cpuidle_coupled_parallel_barrier(dev, &exynos_idle_barrier);

​

    exynos_cpuidle_pdata->post_enter_aftr();

​

    return index;

}

​

static int exynos_enter_lowpower(struct cpuidle_device *dev,

                struct cpuidle_driver *drv,

                int index)