2 * pm_domain.h - Definitions and headers related to device power domains.
4 * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
6 * This file is released under the GPLv2.
9 #ifndef _LINUX_PM_DOMAIN_H
10 #define _LINUX_PM_DOMAIN_H
12 #include <linux/device.h>
13 #include <linux/mutex.h>
15 #include <linux/err.h>
17 #include <linux/notifier.h>
18 #include <linux/cpuidle.h>
21 GPD_STATE_ACTIVE = 0, /* PM domain is active */
22 GPD_STATE_WAIT_MASTER, /* PM domain's master is being waited for */
23 GPD_STATE_BUSY, /* Something is happening to the PM domain */
24 GPD_STATE_REPEAT, /* Power off in progress, to be repeated */
25 GPD_STATE_POWER_OFF, /* PM domain is off */
28 struct dev_power_governor {
29 bool (*power_down_ok)(struct dev_pm_domain *domain);
30 bool (*stop_ok)(struct device *dev);
34 int (*start)(struct device *dev);
35 int (*stop)(struct device *dev);
36 int (*save_state)(struct device *dev);
37 int (*restore_state)(struct device *dev);
38 int (*suspend)(struct device *dev);
39 int (*suspend_late)(struct device *dev);
40 int (*resume_early)(struct device *dev);
41 int (*resume)(struct device *dev);
42 int (*freeze)(struct device *dev);
43 int (*freeze_late)(struct device *dev);
44 int (*thaw_early)(struct device *dev);
45 int (*thaw)(struct device *dev);
46 bool (*active_wakeup)(struct device *dev);
50 unsigned int saved_exit_latency;
51 struct cpuidle_state *idle_state;
54 struct generic_pm_domain {
55 struct dev_pm_domain domain; /* PM domain operations */
56 struct list_head gpd_list_node; /* Node in the global PM domains list */
57 struct list_head master_links; /* Links with PM domain as a master */
58 struct list_head slave_links; /* Links with PM domain as a slave */
59 struct list_head dev_list; /* List of devices */
61 struct dev_power_governor *gov;
62 struct work_struct power_off_work;
64 unsigned int in_progress; /* Number of devices being suspended now */
65 atomic_t sd_count; /* Number of subdomains with power "on" */
66 enum gpd_status status; /* Current state of the domain */
67 wait_queue_head_t status_wait_queue;
68 struct task_struct *poweroff_task; /* Powering off task */
69 unsigned int resume_count; /* Number of devices being resumed */
70 unsigned int device_count; /* Number of devices */
71 unsigned int suspended_count; /* System suspend device counter */
72 unsigned int prepared_count; /* Suspend counter of prepared devices */
73 bool suspend_power_off; /* Power status before system suspend */
74 bool dev_irq_safe; /* Device callbacks are IRQ-safe */
75 int (*power_off)(struct generic_pm_domain *domain);
76 s64 power_off_latency_ns;
77 int (*power_on)(struct generic_pm_domain *domain);
78 s64 power_on_latency_ns;
79 struct gpd_dev_ops dev_ops;
80 s64 max_off_time_ns; /* Maximum allowed "suspended" time. */
81 bool max_off_time_changed;
82 bool cached_power_down_ok;
83 struct device_node *of_node; /* Node in device tree */
84 struct gpd_cpu_data *cpu_data;
87 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
89 return container_of(pd, struct generic_pm_domain, domain);
93 struct generic_pm_domain *master;
94 struct list_head master_node;
95 struct generic_pm_domain *slave;
96 struct list_head slave_node;
99 struct gpd_timing_data {
101 s64 start_latency_ns;
102 s64 save_state_latency_ns;
103 s64 restore_state_latency_ns;
104 s64 effective_constraint_ns;
105 bool constraint_changed;
109 struct generic_pm_domain_data {
110 struct pm_domain_data base;
111 struct gpd_dev_ops ops;
112 struct gpd_timing_data td;
113 struct notifier_block nb;
115 unsigned int refcount;
119 #ifdef CONFIG_PM_GENERIC_DOMAINS
120 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
122 return container_of(pdd, struct generic_pm_domain_data, base);
125 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
127 return to_gpd_data(dev->power.subsys_data->domain_data);
130 extern struct dev_power_governor simple_qos_governor;
132 extern struct generic_pm_domain *dev_to_genpd(struct device *dev);
133 extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
135 struct gpd_timing_data *td);
137 extern int __pm_genpd_of_add_device(struct device_node *genpd_node,
139 struct gpd_timing_data *td);
141 extern int __pm_genpd_name_add_device(const char *domain_name,
143 struct gpd_timing_data *td);
145 extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
147 extern void pm_genpd_dev_need_restore(struct device *dev, bool val);
148 extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
149 struct generic_pm_domain *new_subdomain);
150 extern int pm_genpd_add_subdomain_names(const char *master_name,
151 const char *subdomain_name);
152 extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
153 struct generic_pm_domain *target);
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);
158 extern int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state);
159 extern int pm_genpd_name_attach_cpuidle(const char *name, int state);
160 extern int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd);
161 extern int pm_genpd_name_detach_cpuidle(const char *name);
162 extern void pm_genpd_init(struct generic_pm_domain *genpd,
163 struct dev_power_governor *gov, bool is_off);
165 extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
166 extern int pm_genpd_name_poweron(const char *domain_name);
168 extern bool default_stop_ok(struct device *dev);
170 extern struct dev_power_governor pm_domain_always_on_gov;
173 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
175 return ERR_PTR(-ENOSYS);
177 static inline struct generic_pm_domain *dev_to_genpd(struct device *dev)
179 return ERR_PTR(-ENOSYS);
181 static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
183 struct gpd_timing_data *td)
187 static inline int __pm_genpd_of_add_device(struct device_node *genpd_node,
189 struct gpd_timing_data *td)
193 static inline int __pm_genpd_name_add_device(const char *domain_name,
195 struct gpd_timing_data *td)
199 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
204 static inline void pm_genpd_dev_need_restore(struct device *dev, bool val) {}
205 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
206 struct generic_pm_domain *new_sd)
210 static inline int pm_genpd_add_subdomain_names(const char *master_name,
211 const char *subdomain_name)
215 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
216 struct generic_pm_domain *target)
220 static inline int pm_genpd_add_callbacks(struct device *dev,
221 struct gpd_dev_ops *ops,
222 struct gpd_timing_data *td)
226 static inline int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td)
230 static inline int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int st)
234 static inline int pm_genpd_name_attach_cpuidle(const char *name, int state)
238 static inline int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd)
242 static inline int pm_genpd_name_detach_cpuidle(const char *name)
246 static inline void pm_genpd_init(struct generic_pm_domain *genpd,
247 struct dev_power_governor *gov, bool is_off)
250 static inline int pm_genpd_poweron(struct generic_pm_domain *genpd)
254 static inline int pm_genpd_name_poweron(const char *domain_name)
258 static inline bool default_stop_ok(struct device *dev)
262 #define simple_qos_governor NULL
263 #define pm_domain_always_on_gov NULL
266 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
269 return __pm_genpd_add_device(genpd, dev, NULL);
272 static inline int pm_genpd_of_add_device(struct device_node *genpd_node,
275 return __pm_genpd_of_add_device(genpd_node, dev, NULL);
278 static inline int pm_genpd_name_add_device(const char *domain_name,
281 return __pm_genpd_name_add_device(domain_name, dev, NULL);
284 static inline int pm_genpd_remove_callbacks(struct device *dev)
286 return __pm_genpd_remove_callbacks(dev, true);
289 #ifdef CONFIG_PM_GENERIC_DOMAINS_RUNTIME
290 extern void genpd_queue_power_off_work(struct generic_pm_domain *genpd);
291 extern void pm_genpd_poweroff_unused(void);
293 static inline void genpd_queue_power_off_work(struct generic_pm_domain *gpd) {}
294 static inline void pm_genpd_poweroff_unused(void) {}
297 #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
298 extern void pm_genpd_syscore_switch(struct device *dev, bool suspend);
300 static inline void pm_genpd_syscore_switch(struct device *dev, bool suspend) {}
303 static inline void pm_genpd_syscore_poweroff(struct device *dev)
305 pm_genpd_syscore_switch(dev, true);
308 static inline void pm_genpd_syscore_poweron(struct device *dev)
310 pm_genpd_syscore_switch(dev, false);
313 #endif /* _LINUX_PM_DOMAIN_H */