leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

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

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/cpuidle/Kconfig.arm
View File

@ -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
View File

@ -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
View File

@ -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");