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

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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: Nadav Haklai <nadavh@marvell.com>
Link: https://lkml.kernel.org/r/1397488214-20685-11-git-send-email-gregory.clement@free-electrons.com
Signed-off-by: Gregory 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: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Gregory CLEMENT 2014-04-14 17:10:13 +02:00 committed by Jason Cooper
parent d163ee165b
commit b858fbc191
3 changed files with 99 additions and 0 deletions
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5
drivers/cpuidle/Kconfig.arm
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@ -1,6 +1,11 @@
#
# 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"

1
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

93
drivers/cpuidle/cpuidle-armada-370-xp.c Normal file
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@ -0,0 +1,93 @@
/*
* 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");