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/*
* Marvell Armada 370, 38x and 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 MVEBU_V7_FLAG_DEEP_IDLE 0x10000
static int (*mvebu_v7_cpu_suspend)(int);
static __cpuidle int mvebu_v7_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 & MVEBU_V7_FLAG_DEEP_IDLE)
deepidle = true;
ct_cpuidle_enter();
ret = mvebu_v7_cpu_suspend(deepidle);
ct_cpuidle_exit();
cpu_pm_exit();
if (ret)
return ret;
return index;
}
static struct cpuidle_driver armadaxp_idle_driver = {
.name = "armada_xp_idle",
.states[0] = ARM_CPUIDLE_WFI_STATE,
.states[1] = {
.enter = mvebu_v7_enter_idle,
.exit_latency = 100,
.power_usage = 50,
.target_residency = 1000,
.flags = CPUIDLE_FLAG_RCU_IDLE,
.name = "MV CPU IDLE",
.desc = "CPU power down",
},
.states[2] = {
.enter = mvebu_v7_enter_idle,
.exit_latency = 1000,
.power_usage = 5,
.target_residency = 10000,
.flags = MVEBU_V7_FLAG_DEEP_IDLE | CPUIDLE_FLAG_RCU_IDLE,
.name = "MV CPU DEEP IDLE",
.desc = "CPU and L2 Fabric power down",
},
.state_count = 3,
};
static struct cpuidle_driver armada370_idle_driver = {
.name = "armada_370_idle",
.states[0] = ARM_CPUIDLE_WFI_STATE,
.states[1] = {
.enter = mvebu_v7_enter_idle,
.exit_latency = 100,
.power_usage = 5,
.target_residency = 1000,
.flags = MVEBU_V7_FLAG_DEEP_IDLE | CPUIDLE_FLAG_RCU_IDLE,
.name = "Deep Idle",
.desc = "CPU and L2 Fabric power down",
},
.state_count = 2,
};
static struct cpuidle_driver armada38x_idle_driver = {
.name = "armada_38x_idle",
.states[0] = ARM_CPUIDLE_WFI_STATE,
.states[1] = {
.enter = mvebu_v7_enter_idle,
.exit_latency = 10,
.power_usage = 5,
.target_residency = 100,
.flags = CPUIDLE_FLAG_RCU_IDLE,
.name = "Idle",
.desc = "CPU and SCU power down",
},
.state_count = 2,
};
static int mvebu_v7_cpuidle_probe(struct platform_device *pdev)
{
const struct platform_device_id *id = pdev->id_entry;
if (!id)
return -EINVAL;
mvebu_v7_cpu_suspend = pdev->dev.platform_data;
return cpuidle_register((struct cpuidle_driver *)id->driver_data, NULL);
}
static const struct platform_device_id mvebu_cpuidle_ids[] = {
{
.name = "cpuidle-armada-xp",
.driver_data = (unsigned long)&armadaxp_idle_driver,
}, {
.name = "cpuidle-armada-370",
.driver_data = (unsigned long)&armada370_idle_driver,
}, {
.name = "cpuidle-armada-38x",
.driver_data = (unsigned long)&armada38x_idle_driver,
},
{}
};
static struct platform_driver mvebu_cpuidle_driver = {
.probe = mvebu_v7_cpuidle_probe,
.driver = {
.name = "cpuidle-mbevu",
.suppress_bind_attrs = true,
},
.id_table = mvebu_cpuidle_ids,
};
builtin_platform_driver(mvebu_cpuidle_driver);
MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>");
MODULE_DESCRIPTION("Marvell EBU v7 cpuidle driver");
MODULE_LICENSE("GPL");
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