Commit b858fbc1 authored by Gregory CLEMENT's avatar Gregory CLEMENT Committed by Jason Cooper
Browse files

cpuidle: mvebu: Add initial CPU idle support for Armada 370/XP SoC 



Add the wfi, cpu idle and cpu deep idle power states support for the
Armada XP SoCs.

All the latencies and the power consumption values used at the
"armada_370_xp_idle_driver" structure are preliminary and will be
modified in the future after running some measurements and analysis.

Based on the work of Nadav Haklai.

Signed-off-by: default avatarNadav Haklai <nadavh@marvell.com>
Link: https://lkml.kernel.org/r/1397488214-20685-11-git-send-email-gregory.clement@free-electrons.com


Signed-off-by: default avatarGregory CLEMENT <gregory.clement@free-electrons.com>
Link: https://lkml.kernel.org/r/1397488214-20685-11-git-send-email-gregory.clement@free-electrons.com


Acked-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: default avatarJason Cooper <jason@lakedaemon.net>
parent d163ee16

drivers/cpuidle/Kconfig.arm

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#

# ARM CPU Idle drivers

#

config ARM_ARMADA_370_XP_CPUIDLE

	bool "CPU Idle Driver for Armada 370/XP family processors"

	depends on ARCH_MVEBU

	help

	  Select this to enable cpuidle on Armada 370/XP processors.



config ARM_BIG_LITTLE_CPUIDLE

	bool "Support for ARM big.LITTLE processors"

drivers/cpuidle/Makefile

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@@ -7,6 +7,7 @@ obj-$(CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED) += coupled.o 


##################################################################################

# ARM SoC drivers

obj-$(CONFIG_ARM_ARMADA_370_XP_CPUIDLE) += cpuidle-armada-370-xp.o

obj-$(CONFIG_ARM_BIG_LITTLE_CPUIDLE)	+= cpuidle-big_little.o

obj-$(CONFIG_ARM_HIGHBANK_CPUIDLE)	+= cpuidle-calxeda.o

obj-$(CONFIG_ARM_KIRKWOOD_CPUIDLE)	+= cpuidle-kirkwood.o

drivers/cpuidle/cpuidle-armada-370-xp.c

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+93 −0
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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			= "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");