mirror of https://gitee.com/openkylin/linux.git
82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
/*
|
|
* 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 __init 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);
|