[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>

/* Defines used for the flags field in the struct generic_pm_domain */
#define GENPD_FLAG_PM_CLK	(1U << 0) /* PM domain uses PM clk */

#define GENPD_MAX_NUM_STATES	8 /* Number of possible low power states */

enum gpd_status {
	GPD_STATE_ACTIVE = 0,	/* PM domain is active */
	GPD_STATE_POWER_OFF,	/* PM domain is off */
};

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

struct gpd_dev_ops {
	int (*start)(struct device *dev);
	int (*stop)(struct device *dev);
	bool (*active_wakeup)(struct device *dev);
};

struct genpd_power_state {
	s64 power_off_latency_ns;
	s64 power_on_latency_ns;
};

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;
	const char *name;
	atomic_t sd_count;	/* Number of subdomains with power "on" */
	enum gpd_status status;	/* Current state of the domain */
	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 */
	int (*power_off)(struct generic_pm_domain *domain);
	int (*power_on)(struct generic_pm_domain *domain);
	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;
	int (*attach_dev)(struct generic_pm_domain *domain,
			  struct device *dev);
	void (*detach_dev)(struct generic_pm_domain *domain,
			   struct device *dev);
	unsigned int flags;		/* Bit field of configs for genpd */
	struct genpd_power_state states[GENPD_MAX_NUM_STATES];
	unsigned int state_count; /* number of states */
	unsigned int state_idx; /* state that genpd will go to when off */

};

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 suspend_latency_ns;
	s64 resume_latency_ns;
	s64 effective_constraint_ns;
	bool constraint_changed;
	bool cached_suspend_ok;
};

struct pm_domain_data {
	struct list_head list_node;
	struct device *dev;
};

struct generic_pm_domain_data {
	struct pm_domain_data base;
	struct gpd_timing_data td;
	struct notifier_block nb;
};

#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 generic_pm_domain *pm_genpd_lookup_dev(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_remove_device(struct generic_pm_domain *genpd,
				  struct device *dev);
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 void pm_genpd_init(struct generic_pm_domain *genpd,
			  struct dev_power_governor *gov, bool is_off);

extern struct dev_power_governor simple_qos_governor;
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 *pm_genpd_lookup_dev(struct device *dev)
{
	return NULL;
}
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_remove_device(struct generic_pm_domain *genpd,
					 struct device *dev)
{
	return -ENOSYS;
}
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 void pm_genpd_init(struct generic_pm_domain *genpd,
				 struct dev_power_governor *gov, bool is_off)
{
}
#endif

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

#ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
extern void pm_genpd_syscore_poweroff(struct device *dev);
extern void pm_genpd_syscore_poweron(struct device *dev);
#else
static inline void pm_genpd_syscore_poweroff(struct device *dev) {}
static inline void pm_genpd_syscore_poweron(struct device *dev) {}
#endif

/* OF PM domain providers */
struct of_device_id;

struct genpd_onecell_data {
	struct generic_pm_domain **domains;
	unsigned int num_domains;
};

typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args,
						void *data);

#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
			void *data);
void of_genpd_del_provider(struct device_node *np);
struct generic_pm_domain *of_genpd_get_from_provider(
			struct of_phandle_args *genpdspec);

struct generic_pm_domain *__of_genpd_xlate_simple(
					struct of_phandle_args *genpdspec,
					void *data);
struct generic_pm_domain *__of_genpd_xlate_onecell(
					struct of_phandle_args *genpdspec,
					void *data);

int genpd_dev_pm_attach(struct device *dev);
#else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
static inline int __of_genpd_add_provider(struct device_node *np,
					genpd_xlate_t xlate, void *data)
{
	return 0;
}
static inline void of_genpd_del_provider(struct device_node *np) {}

static inline struct generic_pm_domain *of_genpd_get_from_provider(
			struct of_phandle_args *genpdspec)
{
	return NULL;
}

#define __of_genpd_xlate_simple		NULL
#define __of_genpd_xlate_onecell	NULL

static inline int genpd_dev_pm_attach(struct device *dev)
{
	return -ENODEV;
}
#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */

static inline int of_genpd_add_provider_simple(struct device_node *np,
					struct generic_pm_domain *genpd)
{
	return __of_genpd_add_provider(np, __of_genpd_xlate_simple, genpd);
}
static inline int of_genpd_add_provider_onecell(struct device_node *np,
					struct genpd_onecell_data *data)
{
	return __of_genpd_add_provider(np, __of_genpd_xlate_onecell, data);
}

#ifdef CONFIG_PM
extern int dev_pm_domain_attach(struct device *dev, bool power_on);
extern void dev_pm_domain_detach(struct device *dev, bool power_off);
extern void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);
#else
static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
{
	return -ENODEV;
}
static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
static inline void dev_pm_domain_set(struct device *dev,
				     struct dev_pm_domain *pd) {}
#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
c11f6f5b UH	19	/* Defines used for the flags field in the struct generic_pm_domain */
	20	#define GENPD_FLAG_PM_CLK (1U << 0) /* PM domain uses PM clk */
	21
fc5cbf0c AH	22	#define GENPD_MAX_NUM_STATES 8 /* Number of possible low power states */
fc5cbf0c AH	23
17b75eca RW	24	enum gpd_status {
17b75eca RW	25	GPD_STATE_ACTIVE = 0, /* PM domain is active */
17b75eca RW	26	GPD_STATE_POWER_OFF, /* PM domain is off */
17b75eca RW	27	};
596ba34b	28
f721889f RW	29	struct dev_power_governor {
f721889f RW	30	bool (power_down_ok)(struct dev_pm_domain domain);
9df3921e	31	bool (suspend_ok)(struct device dev);
f721889f RW	32	};
f721889f RW	33
d5e4cbfe RW	34	struct gpd_dev_ops {
	35	int (start)(struct device dev);
	36	int (stop)(struct device dev);
	37	bool (active_wakeup)(struct device dev);
	38	};
	39
fc5cbf0c AH	40	struct genpd_power_state {
	41	s64 power_off_latency_ns;
	42	s64 power_on_latency_ns;
	43	};
	44
f721889f RW	45	struct generic_pm_domain {
f721889f RW	46	struct dev_pm_domain domain; /* PM domain operations */
5125bbf3	47	struct list_head gpd_list_node; /* Node in the global PM domains list */
5063ce15 RW	48	struct list_head master_links; /* Links with PM domain as a master */
5063ce15 RW	49	struct list_head slave_links; /* Links with PM domain as a slave */
f721889f RW	50	struct list_head dev_list; /* List of devices */
	51	struct mutex lock;
	52	struct dev_power_governor *gov;
	53	struct work_struct power_off_work;
d07e9c17	54	const char *name;
c4bb3160	55	atomic_t sd_count; /* Number of subdomains with power "on" */
17b75eca	56	enum gpd_status status; /* Current state of the domain */
596ba34b RW	57	unsigned int device_count; /* Number of devices */
	58	unsigned int suspended_count; /* System suspend device counter */
	59	unsigned int prepared_count; /* Suspend counter of prepared devices */
	60	bool suspend_power_off; /* Power status before system suspend */
f721889f RW	61	int (power_off)(struct generic_pm_domain domain);
f721889f RW	62	int (power_on)(struct generic_pm_domain domain);
d5e4cbfe	63	struct gpd_dev_ops dev_ops;
221e9b58	64	s64 max_off_time_ns; /* Maximum allowed "suspended" time. */
6ff7bb0d RW	65	bool max_off_time_changed;
6ff7bb0d RW	66	bool cached_power_down_ok;
c16561e8 UH	67	int (attach_dev)(struct generic_pm_domain domain,
	68	struct device *dev);
	69	void (detach_dev)(struct generic_pm_domain domain,
	70	struct device *dev);
c11f6f5b	71	unsigned int flags; /* Bit field of configs for genpd */
fc5cbf0c AH	72	struct genpd_power_state states[GENPD_MAX_NUM_STATES];
	73	unsigned int state_count; /* number of states */
	74	unsigned int state_idx; /* state that genpd will go to when off */
	75
f721889f RW	76	};
f721889f RW	77
596ba34b RW	78	static inline struct generic_pm_domain pd_to_genpd(struct dev_pm_domain pd)
	79	{
	80	return container_of(pd, struct generic_pm_domain, domain);
	81	}
	82
5063ce15 RW	83	struct gpd_link {
	84	struct generic_pm_domain *master;
	85	struct list_head master_node;
	86	struct generic_pm_domain *slave;
	87	struct list_head slave_node;
	88	};
	89
b02c999a	90	struct gpd_timing_data {
2b1d88cd UH	91	s64 suspend_latency_ns;
2b1d88cd UH	92	s64 resume_latency_ns;
a5bef810	93	s64 effective_constraint_ns;
6ff7bb0d	94	bool constraint_changed;
9df3921e	95	bool cached_suspend_ok;
b02c999a RW	96	};
b02c999a RW	97
00e7c295 UH	98	struct pm_domain_data {
	99	struct list_head list_node;
	100	struct device *dev;
	101	};
	102
cd0ea672 RW	103	struct generic_pm_domain_data {
cd0ea672 RW	104	struct pm_domain_data base;
b02c999a	105	struct gpd_timing_data td;
6ff7bb0d	106	struct notifier_block nb;
cd0ea672 RW	107	};
cd0ea672 RW	108
9b4f617b	109	#ifdef CONFIG_PM_GENERIC_DOMAINS
cd0ea672 RW	110	static inline struct generic_pm_domain_data to_gpd_data(struct pm_domain_data pdd)
	111	{
	112	return container_of(pdd, struct generic_pm_domain_data, base);
	113	}
	114
d5e4cbfe RW	115	static inline struct generic_pm_domain_data dev_gpd_data(struct device dev)
	116	{
	117	return to_gpd_data(dev->power.subsys_data->domain_data);
	118	}
	119
446d999c	120	extern struct generic_pm_domain pm_genpd_lookup_dev(struct device dev);
b02c999a RW	121	extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
	122	struct device *dev,
	123	struct gpd_timing_data *td);
	124
f721889f RW	125	extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
	126	struct device *dev);
	127	extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
	128	struct generic_pm_domain *new_subdomain);
	129	extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
	130	struct generic_pm_domain *target);
	131	extern void pm_genpd_init(struct generic_pm_domain *genpd,
	132	struct dev_power_governor *gov, bool is_off);
b02c999a	133
ae3c511c	134	extern struct dev_power_governor simple_qos_governor;
925b44a2	135	extern struct dev_power_governor pm_domain_always_on_gov;
f721889f	136	#else
b02c999a	137
b642631d MD	138	static inline struct generic_pm_domain_data dev_gpd_data(struct device dev)
	139	{
	140	return ERR_PTR(-ENOSYS);
	141	}
446d999c	142	static inline struct generic_pm_domain pm_genpd_lookup_dev(struct device dev)
b02c999a	143	{
446d999c	144	return NULL;
b02c999a RW	145	}
	146	static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
	147	struct device *dev,
	148	struct gpd_timing_data *td)
	149	{
	150	return -ENOSYS;
	151	}
f721889f RW	152	static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
	153	struct device *dev)
	154	{
	155	return -ENOSYS;
	156	}
	157	static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
	158	struct generic_pm_domain *new_sd)
	159	{
	160	return -ENOSYS;
	161	}
	162	static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
	163	struct generic_pm_domain *target)
	164	{
	165	return -ENOSYS;
	166	}
b642631d MD	167	static inline void pm_genpd_init(struct generic_pm_domain *genpd,
b642631d MD	168	struct dev_power_governor *gov, bool is_off)
b02c999a RW	169	{
b02c999a RW	170	}
17f2ae7f RW	171	#endif
17f2ae7f RW	172
b5abb085 RW	173	static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
	174	struct device *dev)
	175	{
	176	return __pm_genpd_add_device(genpd, dev, NULL);
	177	}
	178
77f827de	179	#ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
d47e6464 UH	180	extern void pm_genpd_syscore_poweroff(struct device *dev);
d47e6464 UH	181	extern void pm_genpd_syscore_poweron(struct device *dev);
77f827de	182	#else
d47e6464 UH	183	static inline void pm_genpd_syscore_poweroff(struct device *dev) {}
d47e6464 UH	184	static inline void pm_genpd_syscore_poweron(struct device *dev) {}
77f827de RW	185	#endif
77f827de RW	186
aa42240a TF	187	/* OF PM domain providers */
	188	struct of_device_id;
	189
	190	struct genpd_onecell_data {
	191	struct generic_pm_domain **domains;
	192	unsigned int num_domains;
	193	};
	194
	195	typedef struct generic_pm_domain (genpd_xlate_t)(struct of_phandle_args *args,
	196	void *data);
	197
	198	#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
	199	int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
	200	void *data);
	201	void of_genpd_del_provider(struct device_node *np);
7496fcbe ADK	202	struct generic_pm_domain *of_genpd_get_from_provider(
7496fcbe ADK	203	struct of_phandle_args *genpdspec);
aa42240a TF	204
	205	struct generic_pm_domain *__of_genpd_xlate_simple(
	206	struct of_phandle_args *genpdspec,
	207	void *data);
	208	struct generic_pm_domain *__of_genpd_xlate_onecell(
	209	struct of_phandle_args *genpdspec,
	210	void *data);
	211
	212	int genpd_dev_pm_attach(struct device *dev);
	213	#else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
	214	static inline int __of_genpd_add_provider(struct device_node *np,
	215	genpd_xlate_t xlate, void *data)
	216	{
	217	return 0;
	218	}
	219	static inline void of_genpd_del_provider(struct device_node *np) {}
	220
7496fcbe ADK	221	static inline struct generic_pm_domain *of_genpd_get_from_provider(
	222	struct of_phandle_args *genpdspec)
	223	{
	224	return NULL;
	225	}
	226
aa42240a TF	227	#define __of_genpd_xlate_simple NULL
	228	#define __of_genpd_xlate_onecell NULL
	229
	230	static inline int genpd_dev_pm_attach(struct device *dev)
	231	{
	232	return -ENODEV;
	233	}
	234	#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
	235
	236	static inline int of_genpd_add_provider_simple(struct device_node *np,
	237	struct generic_pm_domain *genpd)
	238	{
	239	return __of_genpd_add_provider(np, __of_genpd_xlate_simple, genpd);
	240	}
	241	static inline int of_genpd_add_provider_onecell(struct device_node *np,
	242	struct genpd_onecell_data *data)
	243	{
	244	return __of_genpd_add_provider(np, __of_genpd_xlate_onecell, data);
	245	}
	246
f48c767c UH	247	#ifdef CONFIG_PM
	248	extern int dev_pm_domain_attach(struct device *dev, bool power_on);
	249	extern void dev_pm_domain_detach(struct device *dev, bool power_off);
989561de	250	extern void dev_pm_domain_set(struct device dev, struct dev_pm_domain pd);
f48c767c UH	251	#else
	252	static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
	253	{
	254	return -ENODEV;
	255	}
	256	static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
989561de TV	257	static inline void dev_pm_domain_set(struct device *dev,
989561de TV	258	struct dev_pm_domain *pd) {}
f48c767c UH	259	#endif
f48c767c UH	260
f721889f	261	#endif /* _LINUX_PM_DOMAIN_H */