cpuidle-calxeda.c
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/*
* 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 <asm/cpuidle.h>
#include <asm/suspend.h>
#include <asm/psci.h>
static int calxeda_idle_finish(unsigned long val)
{
const struct psci_power_state ps = {
.type = PSCI_POWER_STATE_TYPE_POWER_DOWN,
};
return psci_ops.cpu_suspend(ps, __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",
.flags = CPUIDLE_FLAG_TIME_VALID,
.exit_latency = 30,
.power_usage = 50,
.target_residency = 200,
.enter = calxeda_pwrdown_idle,
},
},
.state_count = 2,
};
static int calxeda_cpuidle_probe(struct platform_device *pdev)
{
return cpuidle_register(&calxeda_idle_driver, NULL);
}
static struct platform_driver calxeda_cpuidle_plat_driver = {
.driver = {
.name = "cpuidle-calxeda",
.owner = THIS_MODULE,
},
.probe = calxeda_cpuidle_probe,
};
module_platform_driver(calxeda_cpuidle_plat_driver);