[linux-2.6-block.git] / include / linux / pm_domain.h

/*
 * pm_domain.h - Definitions and headers related to device power domains.
 *
 * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
 *
 * This file is released under the GPLv2.
 */

#ifndef _LINUX_PM_DOMAIN_H
#define _LINUX_PM_DOMAIN_H

#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/pm.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/notifier.h>

enum gpd_status {
	GPD_STATE_ACTIVE = 0,	/* PM domain is active */
	GPD_STATE_WAIT_MASTER,	/* PM domain's master is being waited for */
	GPD_STATE_BUSY,		/* Something is happening to the PM domain */
	GPD_STATE_REPEAT,	/* Power off in progress, to be repeated */
	GPD_STATE_POWER_OFF,	/* PM domain is off */
};

struct dev_power_governor {
	bool (*power_down_ok)(struct dev_pm_domain *domain);
	bool (*stop_ok)(struct device *dev);
};

struct gpd_dev_ops {
	int (*start)(struct device *dev);
	int (*stop)(struct device *dev);
	int (*save_state)(struct device *dev);
	int (*restore_state)(struct device *dev);
	int (*suspend)(struct device *dev);
	int (*suspend_late)(struct device *dev);
	int (*resume_early)(struct device *dev);
	int (*resume)(struct device *dev);
	int (*freeze)(struct device *dev);
	int (*freeze_late)(struct device *dev);
	int (*thaw_early)(struct device *dev);
	int (*thaw)(struct device *dev);
	bool (*active_wakeup)(struct device *dev);
};

struct generic_pm_domain {
	struct dev_pm_domain domain;	/* PM domain operations */
	struct list_head gpd_list_node;	/* Node in the global PM domains list */
	struct list_head master_links;	/* Links with PM domain as a master */
	struct list_head slave_links;	/* Links with PM domain as a slave */
	struct list_head dev_list;	/* List of devices */
	struct mutex lock;
	struct dev_power_governor *gov;
	struct work_struct power_off_work;
	char *name;
	unsigned int in_progress;	/* Number of devices being suspended now */
	atomic_t sd_count;	/* Number of subdomains with power "on" */
	enum gpd_status status;	/* Current state of the domain */
	wait_queue_head_t status_wait_queue;
	struct task_struct *poweroff_task;	/* Powering off task */
	unsigned int resume_count;	/* Number of devices being resumed */
	unsigned int device_count;	/* Number of devices */
	unsigned int suspended_count;	/* System suspend device counter */
	unsigned int prepared_count;	/* Suspend counter of prepared devices */
	bool suspend_power_off;	/* Power status before system suspend */
	bool dev_irq_safe;	/* Device callbacks are IRQ-safe */
	int (*power_off)(struct generic_pm_domain *domain);
	s64 power_off_latency_ns;
	int (*power_on)(struct generic_pm_domain *domain);
	s64 power_on_latency_ns;
	struct gpd_dev_ops dev_ops;
	s64 max_off_time_ns;	/* Maximum allowed "suspended" time. */
	bool max_off_time_changed;
	bool cached_power_down_ok;
	struct device_node *of_node; /* Node in device tree */
};

static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
{
	return container_of(pd, struct generic_pm_domain, domain);
}

struct gpd_link {
	struct generic_pm_domain *master;
	struct list_head master_node;
	struct generic_pm_domain *slave;
	struct list_head slave_node;
};

struct gpd_timing_data {
	s64 stop_latency_ns;
	s64 start_latency_ns;
	s64 save_state_latency_ns;
	s64 restore_state_latency_ns;
	s64 effective_constraint_ns;
	bool constraint_changed;
	bool cached_stop_ok;
};

struct generic_pm_domain_data {
	struct pm_domain_data base;
	struct gpd_dev_ops ops;
	struct gpd_timing_data td;
	struct notifier_block nb;
	struct mutex lock;
	bool need_restore;
	bool always_on;
};

#ifdef CONFIG_PM_GENERIC_DOMAINS
static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
{
	return container_of(pdd, struct generic_pm_domain_data, base);
}

static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
{
	return to_gpd_data(dev->power.subsys_data->domain_data);
}

extern struct dev_power_governor simple_qos_governor;

extern struct generic_pm_domain *dev_to_genpd(struct device *dev);
extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
				 struct device *dev,
				 struct gpd_timing_data *td);

extern int __pm_genpd_of_add_device(struct device_node *genpd_node,
				    struct device *dev,
				    struct gpd_timing_data *td);

static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
				      struct device *dev)
{
	return __pm_genpd_add_device(genpd, dev, NULL);
}

static inline int pm_genpd_of_add_device(struct device_node *genpd_node,
					 struct device *dev)
{
	return __pm_genpd_of_add_device(genpd_node, dev, NULL);
}

extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
				  struct device *dev);
extern void pm_genpd_dev_always_on(struct device *dev, bool val);
extern void pm_genpd_dev_need_restore(struct device *dev, bool val);
extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
				  struct generic_pm_domain *new_subdomain);
extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
				     struct generic_pm_domain *target);
extern int pm_genpd_add_callbacks(struct device *dev,
				  struct gpd_dev_ops *ops,
				  struct gpd_timing_data *td);
extern int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td);
extern void pm_genpd_init(struct generic_pm_domain *genpd,
			  struct dev_power_governor *gov, bool is_off);

extern int pm_genpd_poweron(struct generic_pm_domain *genpd);

extern bool default_stop_ok(struct device *dev);

extern struct dev_power_governor pm_domain_always_on_gov;
#else

static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
{
	return ERR_PTR(-ENOSYS);
}
static inline struct generic_pm_domain *dev_to_genpd(struct device *dev)
{
	return ERR_PTR(-ENOSYS);
}
static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
					struct device *dev,
					struct gpd_timing_data *td)
{
	return -ENOSYS;
}
static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
				      struct device *dev)
{
	return -ENOSYS;
}
static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
					 struct device *dev)
{
	return -ENOSYS;
}
static inline void pm_genpd_dev_always_on(struct device *dev, bool val) {}
static inline void pm_genpd_dev_need_restore(struct device *dev, bool val) {}
static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
					 struct generic_pm_domain *new_sd)
{
	return -ENOSYS;
}
static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
					    struct generic_pm_domain *target)
{
	return -ENOSYS;
}
static inline int pm_genpd_add_callbacks(struct device *dev,
					 struct gpd_dev_ops *ops,
					 struct gpd_timing_data *td)
{
	return -ENOSYS;
}
static inline int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td)
{
	return -ENOSYS;
}
static inline void pm_genpd_init(struct generic_pm_domain *genpd,
				 struct dev_power_governor *gov, bool is_off)
{
}
static inline int pm_genpd_poweron(struct generic_pm_domain *genpd)
{
	return -ENOSYS;
}
static inline bool default_stop_ok(struct device *dev)
{
	return false;
}
#define simple_qos_governor NULL
#define pm_domain_always_on_gov NULL
#endif

static inline int pm_genpd_remove_callbacks(struct device *dev)
{
	return __pm_genpd_remove_callbacks(dev, true);
}

#ifdef CONFIG_PM_GENERIC_DOMAINS_RUNTIME
extern void genpd_queue_power_off_work(struct generic_pm_domain *genpd);
extern void pm_genpd_poweroff_unused(void);
#else
static inline void genpd_queue_power_off_work(struct generic_pm_domain *gpd) {}
static inline void pm_genpd_poweroff_unused(void) {}
#endif

#endif /* _LINUX_PM_DOMAIN_H */
Commit	Line	Data
f721889f RW	1	/*
	2	* pm_domain.h - Definitions and headers related to device power domains.
	3	*
	4	* Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
	5	*
	6	* This file is released under the GPLv2.
	7	*/
	8
	9	#ifndef _LINUX_PM_DOMAIN_H
	10	#define _LINUX_PM_DOMAIN_H
	11
	12	#include <linux/device.h>
313162d0 PG	13	#include <linux/mutex.h>
313162d0 PG	14	#include <linux/pm.h>
4f042cda	15	#include <linux/err.h>
c8aa130b	16	#include <linux/of.h>
6ff7bb0d	17	#include <linux/notifier.h>
f721889f	18
17b75eca RW	19	enum gpd_status {
17b75eca RW	20	GPD_STATE_ACTIVE = 0, /* PM domain is active */
17877eb5	21	GPD_STATE_WAIT_MASTER, /* PM domain's master is being waited for */
17b75eca	22	GPD_STATE_BUSY, /* Something is happening to the PM domain */
c6d22b37	23	GPD_STATE_REPEAT, /* Power off in progress, to be repeated */
17b75eca RW	24	GPD_STATE_POWER_OFF, /* PM domain is off */
17b75eca RW	25	};
596ba34b	26
f721889f RW	27	struct dev_power_governor {
f721889f RW	28	bool (power_down_ok)(struct dev_pm_domain domain);
b02c999a	29	bool (stop_ok)(struct device dev);
f721889f RW	30	};
f721889f RW	31
d5e4cbfe RW	32	struct gpd_dev_ops {
	33	int (start)(struct device dev);
	34	int (stop)(struct device dev);
ecf00475 RW	35	int (save_state)(struct device dev);
ecf00475 RW	36	int (restore_state)(struct device dev);
d23b9b00 RW	37	int (suspend)(struct device dev);
	38	int (suspend_late)(struct device dev);
	39	int (resume_early)(struct device dev);
	40	int (resume)(struct device dev);
	41	int (freeze)(struct device dev);
	42	int (freeze_late)(struct device dev);
	43	int (thaw_early)(struct device dev);
	44	int (thaw)(struct device dev);
d5e4cbfe RW	45	bool (active_wakeup)(struct device dev);
	46	};
	47
f721889f RW	48	struct generic_pm_domain {
f721889f RW	49	struct dev_pm_domain domain; /* PM domain operations */
5125bbf3	50	struct list_head gpd_list_node; /* Node in the global PM domains list */
5063ce15 RW	51	struct list_head master_links; /* Links with PM domain as a master */
5063ce15 RW	52	struct list_head slave_links; /* Links with PM domain as a slave */
f721889f RW	53	struct list_head dev_list; /* List of devices */
	54	struct mutex lock;
	55	struct dev_power_governor *gov;
	56	struct work_struct power_off_work;
e84b2c20	57	char *name;
f721889f	58	unsigned int in_progress; /* Number of devices being suspended now */
c4bb3160	59	atomic_t sd_count; /* Number of subdomains with power "on" */
17b75eca RW	60	enum gpd_status status; /* Current state of the domain */
17b75eca RW	61	wait_queue_head_t status_wait_queue;
c6d22b37 RW	62	struct task_struct poweroff_task; / Powering off task */
c6d22b37 RW	63	unsigned int resume_count; /* Number of devices being resumed */
596ba34b RW	64	unsigned int device_count; /* Number of devices */
	65	unsigned int suspended_count; /* System suspend device counter */
	66	unsigned int prepared_count; /* Suspend counter of prepared devices */
	67	bool suspend_power_off; /* Power status before system suspend */
0aa2a221	68	bool dev_irq_safe; /* Device callbacks are IRQ-safe */
f721889f	69	int (power_off)(struct generic_pm_domain domain);
221e9b58	70	s64 power_off_latency_ns;
f721889f	71	int (power_on)(struct generic_pm_domain domain);
221e9b58	72	s64 power_on_latency_ns;
d5e4cbfe	73	struct gpd_dev_ops dev_ops;
221e9b58	74	s64 max_off_time_ns; /* Maximum allowed "suspended" time. */
6ff7bb0d RW	75	bool max_off_time_changed;
6ff7bb0d RW	76	bool cached_power_down_ok;
c8aa130b	77	struct device_node of_node; / Node in device tree */
f721889f RW	78	};
f721889f RW	79
596ba34b RW	80	static inline struct generic_pm_domain pd_to_genpd(struct dev_pm_domain pd)
	81	{
	82	return container_of(pd, struct generic_pm_domain, domain);
	83	}
	84
5063ce15 RW	85	struct gpd_link {
	86	struct generic_pm_domain *master;
	87	struct list_head master_node;
	88	struct generic_pm_domain *slave;
	89	struct list_head slave_node;
	90	};
	91
b02c999a RW	92	struct gpd_timing_data {
	93	s64 stop_latency_ns;
	94	s64 start_latency_ns;
221e9b58 RW	95	s64 save_state_latency_ns;
221e9b58 RW	96	s64 restore_state_latency_ns;
a5bef810	97	s64 effective_constraint_ns;
6ff7bb0d RW	98	bool constraint_changed;
6ff7bb0d RW	99	bool cached_stop_ok;
b02c999a RW	100	};
b02c999a RW	101
cd0ea672 RW	102	struct generic_pm_domain_data {
cd0ea672 RW	103	struct pm_domain_data base;
d5e4cbfe	104	struct gpd_dev_ops ops;
b02c999a	105	struct gpd_timing_data td;
6ff7bb0d RW	106	struct notifier_block nb;
6ff7bb0d RW	107	struct mutex lock;
cd0ea672	108	bool need_restore;
1e78a0c7	109	bool always_on;
cd0ea672 RW	110	};
cd0ea672 RW	111
9b4f617b	112	#ifdef CONFIG_PM_GENERIC_DOMAINS
cd0ea672 RW	113	static inline struct generic_pm_domain_data to_gpd_data(struct pm_domain_data pdd)
	114	{
	115	return container_of(pdd, struct generic_pm_domain_data, base);
	116	}
	117
d5e4cbfe RW	118	static inline struct generic_pm_domain_data dev_gpd_data(struct device dev)
	119	{
	120	return to_gpd_data(dev->power.subsys_data->domain_data);
	121	}
	122
b02c999a RW	123	extern struct dev_power_governor simple_qos_governor;
	124
	125	extern struct generic_pm_domain dev_to_genpd(struct device dev);
	126	extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
	127	struct device *dev,
	128	struct gpd_timing_data *td);
	129
c8aa130b TA	130	extern int __pm_genpd_of_add_device(struct device_node *genpd_node,
	131	struct device *dev,
	132	struct gpd_timing_data *td);
	133
b02c999a RW	134	static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
	135	struct device *dev)
	136	{
	137	return __pm_genpd_add_device(genpd, dev, NULL);
	138	}
	139
c8aa130b TA	140	static inline int pm_genpd_of_add_device(struct device_node *genpd_node,
	141	struct device *dev)
	142	{
	143	return __pm_genpd_of_add_device(genpd_node, dev, NULL);
	144	}
	145
f721889f RW	146	extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
f721889f RW	147	struct device *dev);
1e78a0c7	148	extern void pm_genpd_dev_always_on(struct device *dev, bool val);
ca1d72f0	149	extern void pm_genpd_dev_need_restore(struct device *dev, bool val);
f721889f RW	150	extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
	151	struct generic_pm_domain *new_subdomain);
	152	extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
	153	struct generic_pm_domain *target);
b02c999a RW	154	extern int pm_genpd_add_callbacks(struct device *dev,
	155	struct gpd_dev_ops *ops,
	156	struct gpd_timing_data *td);
	157	extern int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td);
f721889f RW	158	extern void pm_genpd_init(struct generic_pm_domain *genpd,
f721889f RW	159	struct dev_power_governor *gov, bool is_off);
b02c999a	160
18b4f3f5	161	extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
b02c999a RW	162
	163	extern bool default_stop_ok(struct device *dev);
	164
925b44a2	165	extern struct dev_power_governor pm_domain_always_on_gov;
f721889f	166	#else
b02c999a	167
b642631d MD	168	static inline struct generic_pm_domain_data dev_gpd_data(struct device dev)
	169	{
	170	return ERR_PTR(-ENOSYS);
	171	}
b02c999a RW	172	static inline struct generic_pm_domain dev_to_genpd(struct device dev)
	173	{
	174	return ERR_PTR(-ENOSYS);
	175	}
	176	static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
	177	struct device *dev,
	178	struct gpd_timing_data *td)
	179	{
	180	return -ENOSYS;
	181	}
f721889f RW	182	static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
	183	struct device *dev)
	184	{
	185	return -ENOSYS;
	186	}
	187	static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
	188	struct device *dev)
	189	{
	190	return -ENOSYS;
	191	}
1e78a0c7	192	static inline void pm_genpd_dev_always_on(struct device *dev, bool val) {}
ca1d72f0	193	static inline void pm_genpd_dev_need_restore(struct device *dev, bool val) {}
f721889f RW	194	static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
	195	struct generic_pm_domain *new_sd)
	196	{
	197	return -ENOSYS;
	198	}
	199	static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
	200	struct generic_pm_domain *target)
	201	{
	202	return -ENOSYS;
	203	}
d5e4cbfe	204	static inline int pm_genpd_add_callbacks(struct device *dev,
b02c999a RW	205	struct gpd_dev_ops *ops,
b02c999a RW	206	struct gpd_timing_data *td)
d5e4cbfe RW	207	{
	208	return -ENOSYS;
	209	}
b02c999a	210	static inline int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td)
d5e4cbfe RW	211	{
	212	return -ENOSYS;
	213	}
b642631d MD	214	static inline void pm_genpd_init(struct generic_pm_domain *genpd,
b642631d MD	215	struct dev_power_governor *gov, bool is_off)
b02c999a RW	216	{
b02c999a RW	217	}
18b4f3f5 MD	218	static inline int pm_genpd_poweron(struct generic_pm_domain *genpd)
	219	{
	220	return -ENOSYS;
	221	}
b02c999a RW	222	static inline bool default_stop_ok(struct device *dev)
	223	{
	224	return false;
	225	}
b642631d	226	#define simple_qos_governor NULL
925b44a2	227	#define pm_domain_always_on_gov NULL
17f2ae7f RW	228	#endif
17f2ae7f RW	229
b02c999a RW	230	static inline int pm_genpd_remove_callbacks(struct device *dev)
	231	{
	232	return __pm_genpd_remove_callbacks(dev, true);
	233	}
	234
17f2ae7f RW	235	#ifdef CONFIG_PM_GENERIC_DOMAINS_RUNTIME
	236	extern void genpd_queue_power_off_work(struct generic_pm_domain *genpd);
	237	extern void pm_genpd_poweroff_unused(void);
	238	#else
0bc5b2de	239	static inline void genpd_queue_power_off_work(struct generic_pm_domain *gpd) {}
17f2ae7f	240	static inline void pm_genpd_poweroff_unused(void) {}
f721889f RW	241	#endif
	242
	243	#endif /* _LINUX_PM_DOMAIN_H */