94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
|
/*
|
||
|
* 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 = "MV CPU 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 = "MV CPU 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");
|