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/*
* Marvell Armada 370 and Armada XP SoC cpuidle driver
*
* Copyright (C) 2014 Marvell
*
* Nadav Haklai <nadavh@marvell.com>
* Gregory CLEMENT <gregory.clement@free-electrons.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*
* Maintainer: Gregory CLEMENT <gregory.clement@free-electrons.com>
*/
#include <linux/cpu_pm.h>
#include <linux/cpuidle.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/suspend.h>
#include <linux/platform_device.h>
#include <asm/cpuidle.h>
#define ARMADA_370_XP_MAX_STATES 3
#define ARMADA_370_XP_FLAG_DEEP_IDLE 0x10000
static int (*armada_370_xp_cpu_suspend)(int);
static int armada_370_xp_enter_idle(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
int ret;
bool deepidle = false;
cpu_pm_enter();
if (drv->states[index].flags & ARMADA_370_XP_FLAG_DEEP_IDLE)
deepidle = true;
ret = armada_370_xp_cpu_suspend(deepidle);
if (ret)
return ret;
cpu_pm_exit();
return index;
}
static struct cpuidle_driver armada_370_xp_idle_driver = {
.name = "armada_370_xp_idle",
.states[0] = ARM_CPUIDLE_WFI_STATE,
.states[1] = {
.enter = armada_370_xp_enter_idle,
.exit_latency = 10,
.power_usage = 50,
.target_residency = 100,
.flags = CPUIDLE_FLAG_TIME_VALID,
.name = "Idle",
.desc = "CPU power down",
},
.states[2] = {
.enter = armada_370_xp_enter_idle,
.exit_latency = 100,
.power_usage = 5,
.target_residency = 1000,
.flags = CPUIDLE_FLAG_TIME_VALID |
ARMADA_370_XP_FLAG_DEEP_IDLE,
.name = "Deep idle",
.desc = "CPU and L2 Fabric power down",
},
.state_count = ARMADA_370_XP_MAX_STATES,
};
static int armada_370_xp_cpuidle_probe(struct platform_device *pdev)
{
armada_370_xp_cpu_suspend = (void *)(pdev->dev.platform_data);
return cpuidle_register(&armada_370_xp_idle_driver, NULL);
}
static struct platform_driver armada_370_xp_cpuidle_plat_driver = {
.driver = {
.name = "cpuidle-armada-370-xp",
.owner = THIS_MODULE,
},
.probe = armada_370_xp_cpuidle_probe,
};
module_platform_driver(armada_370_xp_cpuidle_plat_driver);
MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>");
MODULE_DESCRIPTION("Armada 370/XP cpu idle driver");
MODULE_LICENSE("GPL");
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