[mirror_ubuntu-artful-kernel.git] / drivers / cpuidle / cpuidle-at91.c

/*
 * based on arch/arm/mach-kirkwood/cpuidle.c
 *
 * CPU idle support for AT91 SoC
 *
 * 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.
 *
 * The cpu idle uses wait-for-interrupt and RAM self refresh in order
 * to implement two idle states -
 * #1 wait-for-interrupt
 * #2 wait-for-interrupt and RAM self refresh
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/cpuidle.h>
#include <linux/io.h>
#include <linux/export.h>
#include <asm/proc-fns.h>
#include <asm/cpuidle.h>

#define AT91_MAX_STATES	2

static void (*at91_standby)(void);

/* Actual code that puts the SoC in different idle states */
static int at91_enter_idle(struct cpuidle_device *dev,
			struct cpuidle_driver *drv,
			       int index)
{
	at91_standby();
	return index;
}

static struct cpuidle_driver at91_idle_driver = {
	.name			= "at91_idle",
	.owner			= THIS_MODULE,
	.states[0]		= ARM_CPUIDLE_WFI_STATE,
	.states[1]		= {
		.enter			= at91_enter_idle,
		.exit_latency		= 10,
		.target_residency	= 10000,
		.flags			= CPUIDLE_FLAG_TIME_VALID,
		.name			= "RAM_SR",
		.desc			= "WFI and DDR Self Refresh",
	},
	.state_count = AT91_MAX_STATES,
};

/* Initialize CPU idle by registering the idle states */
static int at91_cpuidle_probe(struct platform_device *dev)
{
	at91_standby = (void *)(dev->dev.platform_data);
	
	return cpuidle_register(&at91_idle_driver, NULL);
}

static struct platform_driver at91_cpuidle_driver = {
	.driver = {
		.name = "cpuidle-at91",
		.owner = THIS_MODULE,
	},
	.probe = at91_cpuidle_probe,
};

module_platform_driver(at91_cpuidle_driver);
Commit	Line	Data
1ea60cf7 AT	1	/*
	2	* based on arch/arm/mach-kirkwood/cpuidle.c
	3	*
	4	* CPU idle support for AT91 SoC
	5	*
	6	* This file is licensed under the terms of the GNU General Public
	7	* License version 2. This program is licensed "as is" without any
	8	* warranty of any kind, whether express or implied.
	9	*
	10	* The cpu idle uses wait-for-interrupt and RAM self refresh in order
	11	* to implement two idle states -
	12	* #1 wait-for-interrupt
	13	* #2 wait-for-interrupt and RAM self refresh
	14	*/
	15
	16	#include <linux/kernel.h>
	17	#include <linux/init.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/cpuidle.h>
1ea60cf7	20	#include <linux/io.h>
dc28094b	21	#include <linux/export.h>
7e348b90 RL	22	#include <asm/proc-fns.h>
7e348b90 RL	23	#include <asm/cpuidle.h>
1ea60cf7 AT	24
	25	#define AT91_MAX_STATES 2
	26
5ad945ea DL	27	static void (*at91_standby)(void);
5ad945ea DL	28
1ea60cf7 AT	29	/* Actual code that puts the SoC in different idle states */
1ea60cf7 AT	30	static int at91_enter_idle(struct cpuidle_device *dev,
46bcfad7	31	struct cpuidle_driver *drv,
e978aa7d	32	int index)
1ea60cf7	33	{
5ad945ea	34	at91_standby();
e978aa7d	35	return index;
1ea60cf7 AT	36	}
1ea60cf7 AT	37
7e348b90 RL	38	static struct cpuidle_driver at91_idle_driver = {
	39	.name = "at91_idle",
	40	.owner = THIS_MODULE,
7e348b90 RL	41	.states[0] = ARM_CPUIDLE_WFI_STATE,
	42	.states[1] = {
	43	.enter = at91_enter_idle,
	44	.exit_latency = 10,
a008dad7	45	.target_residency = 10000,
7e348b90 RL	46	.flags = CPUIDLE_FLAG_TIME_VALID,
	47	.name = "RAM_SR",
	48	.desc = "WFI and DDR Self Refresh",
	49	},
	50	.state_count = AT91_MAX_STATES,
	51	};
	52
1ea60cf7	53	/* Initialize CPU idle by registering the idle states */
5ad945ea	54	static int at91_cpuidle_probe(struct platform_device *dev)
1ea60cf7	55	{
5ad945ea DL	56	at91_standby = (void *)(dev->dev.platform_data);
5ad945ea DL	57
22f5d1fa	58	return cpuidle_register(&at91_idle_driver, NULL);
1ea60cf7 AT	59	}
1ea60cf7 AT	60
5ad945ea DL	61	static struct platform_driver at91_cpuidle_driver = {
	62	.driver = {
	63	.name = "cpuidle-at91",
	64	.owner = THIS_MODULE,
	65	},
	66	.probe = at91_cpuidle_probe,
	67	};
	68
	69	module_platform_driver(at91_cpuidle_driver);