linux-imx

/*

 * Copyright 2012 Calxeda, Inc.

 *

 * Based on arch/arm/plat-mxc/cpuidle.c: #v3.7

 * Copyright 2012 Freescale Semiconductor, Inc.

 * Copyright 2012 Linaro Ltd.

 *

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

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

 * more details.

 *

 * You should have received a copy of the GNU General Public License along with

 * this program.  If not, see <http://www.gnu.org/licenses/>.

 *

 * Maintainer: Rob Herring <rob.herring@calxeda.com>

 */

​

#include <linux/cpuidle.h>

#include <linux/cpu_pm.h>

#include <linux/init.h>

#include <linux/mm.h>

#include <linux/platform_device.h>

#include <linux/psci.h>

​

#include <asm/cpuidle.h>

#include <asm/suspend.h>

​

#include <uapi/linux/psci.h>

​

#define CALXEDA_IDLE_PARAM \

    ((0 << PSCI_0_2_POWER_STATE_ID_SHIFT) | \

     (0 << PSCI_0_2_POWER_STATE_AFFL_SHIFT) | \

     (PSCI_POWER_STATE_TYPE_POWER_DOWN << PSCI_0_2_POWER_STATE_TYPE_SHIFT))

​

static int calxeda_idle_finish(unsigned long val)

{

    return psci_ops.cpu_suspend(CALXEDA_IDLE_PARAM, __pa(cpu_resume));

}

​

static int calxeda_pwrdown_idle(struct cpuidle_device *dev,

                struct cpuidle_driver *drv,

                int index)

{

    cpu_pm_enter();

    cpu_suspend(0, calxeda_idle_finish);

    cpu_pm_exit();

​

    return index;

}

​

static struct cpuidle_driver calxeda_idle_driver = {

    .name = "calxeda_idle",

    .states = {

        ARM_CPUIDLE_WFI_STATE,

        {

            .name = "PG",

            .desc = "Power Gate",

            .exit_latency = 30,