[mirror_ubuntu-artful-kernel.git] / arch / arm / mach-shmobile / cpuidle.c

/*
 * CPUIdle support code for SH-Mobile ARM
 *
 *  Copyright (C) 2011 Magnus Damm
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/pm.h>
#include <linux/cpuidle.h>
#include <linux/suspend.h>
#include <linux/module.h>
#include <linux/err.h>
#include <asm/system.h>
#include <asm/io.h>

static void shmobile_enter_wfi(void)
{
	cpu_do_idle();
}

void (*shmobile_cpuidle_modes[CPUIDLE_STATE_MAX])(void) = {
	shmobile_enter_wfi, /* regular sleep mode */
};

static int shmobile_cpuidle_enter(struct cpuidle_device *dev,
				  struct cpuidle_driver *drv,
				  int index)
{
	ktime_t before, after;

	before = ktime_get();

	local_irq_disable();
	local_fiq_disable();

	shmobile_cpuidle_modes[index]();

	local_irq_enable();
	local_fiq_enable();

	after = ktime_get();
	dev->last_residency = ktime_to_ns(ktime_sub(after, before)) >> 10;

	return index;
}

static struct cpuidle_device shmobile_cpuidle_dev;
static struct cpuidle_driver shmobile_cpuidle_driver = {
	.name =		"shmobile_cpuidle",
	.owner =	THIS_MODULE,
	.states[0] = {
		.name = "C1",
		.desc = "WFI",
		.exit_latency = 1,
		.target_residency = 1 * 2,
		.flags = CPUIDLE_FLAG_TIME_VALID,
	},
	.safe_state_index = 0, /* C1 */
	.state_count = 1,
};

void (*shmobile_cpuidle_setup)(struct cpuidle_driver *drv);

static int shmobile_cpuidle_init(void)
{
	struct cpuidle_device *dev = &shmobile_cpuidle_dev;
	struct cpuidle_driver *drv = &shmobile_cpuidle_driver;
	int i;

	for (i = 0; i < CPUIDLE_STATE_MAX; i++)
		drv->states[i].enter = shmobile_cpuidle_enter;

	if (shmobile_cpuidle_setup)
		shmobile_cpuidle_setup(drv);

	cpuidle_register_driver(drv);

	dev->state_count = drv->state_count;
	cpuidle_register_device(dev);

	return 0;
}
late_initcall(shmobile_cpuidle_init);
Commit	Line	Data
0af4817b MD	1	/*
	2	* CPUIdle support code for SH-Mobile ARM
	3	*
	4	* Copyright (C) 2011 Magnus Damm
	5	*
	6	* This file is subject to the terms and conditions of the GNU General Public
	7	* License. See the file "COPYING" in the main directory of this archive
	8	* for more details.
	9	*/
	10
	11	#include <linux/pm.h>
	12	#include <linux/cpuidle.h>
	13	#include <linux/suspend.h>
	14	#include <linux/module.h>
	15	#include <linux/err.h>
	16	#include <asm/system.h>
	17	#include <asm/io.h>
	18
	19	static void shmobile_enter_wfi(void)
	20	{
	21	cpu_do_idle();
	22	}
	23
	24	void (*shmobile_cpuidle_modes[CPUIDLE_STATE_MAX])(void) = {
	25	shmobile_enter_wfi, /* regular sleep mode */
	26	};
	27
	28	static int shmobile_cpuidle_enter(struct cpuidle_device *dev,
b73b5c49 MD	29	struct cpuidle_driver *drv,
b73b5c49 MD	30	int index)
0af4817b MD	31	{
0af4817b MD	32	ktime_t before, after;
0af4817b	33
0af4817b MD	34	before = ktime_get();
	35
	36	local_irq_disable();
	37	local_fiq_disable();
	38
b73b5c49	39	shmobile_cpuidle_modes[index]();
0af4817b MD	40
	41	local_irq_enable();
	42	local_fiq_enable();
	43
	44	after = ktime_get();
b73b5c49 MD	45	dev->last_residency = ktime_to_ns(ktime_sub(after, before)) >> 10;
	46
	47	return index;
0af4817b MD	48	}
	49
	50	static struct cpuidle_device shmobile_cpuidle_dev;
	51	static struct cpuidle_driver shmobile_cpuidle_driver = {
	52	.name = "shmobile_cpuidle",
	53	.owner = THIS_MODULE,
b73b5c49 MD	54	.states[0] = {
	55	.name = "C1",
	56	.desc = "WFI",
	57	.exit_latency = 1,
	58	.target_residency = 1 * 2,
	59	.flags = CPUIDLE_FLAG_TIME_VALID,
	60	},
	61	.safe_state_index = 0, /* C1 */
	62	.state_count = 1,
0af4817b MD	63	};
0af4817b MD	64
b73b5c49	65	void (shmobile_cpuidle_setup)(struct cpuidle_driver drv);
0af4817b MD	66
	67	static int shmobile_cpuidle_init(void)
	68	{
	69	struct cpuidle_device *dev = &shmobile_cpuidle_dev;
b73b5c49	70	struct cpuidle_driver *drv = &shmobile_cpuidle_driver;
0af4817b MD	71	int i;
0af4817b MD	72
b73b5c49 MD	73	for (i = 0; i < CPUIDLE_STATE_MAX; i++)
b73b5c49 MD	74	drv->states[i].enter = shmobile_cpuidle_enter;
0af4817b MD	75
0af4817b MD	76	if (shmobile_cpuidle_setup)
b73b5c49 MD	77	shmobile_cpuidle_setup(drv);
	78
	79	cpuidle_register_driver(drv);
0af4817b	80
b73b5c49	81	dev->state_count = drv->state_count;
0af4817b MD	82	cpuidle_register_device(dev);
	83
	84	return 0;
	85	}
	86	late_initcall(shmobile_cpuidle_init);