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_timing_data td;
112 struct notifier_block nb;
114 unsigned int refcount;
118 #ifdef CONFIG_PM_GENERIC_DOMAINS
119 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
121 return container_of(pdd, struct generic_pm_domain_data, base);
124 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
126 return to_gpd_data(dev->power.subsys_data->domain_data);
129 extern struct dev_power_governor simple_qos_governor;
131 extern struct generic_pm_domain *dev_to_genpd(struct device *dev);
132 extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
134 struct gpd_timing_data *td);
136 extern int __pm_genpd_of_add_device(struct device_node *genpd_node,
138 struct gpd_timing_data *td);
140 extern int __pm_genpd_name_add_device(const char *domain_name,
142 struct gpd_timing_data *td);
144 extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
146 extern void pm_genpd_dev_need_restore(struct device *dev, bool val);
147 extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
148 struct generic_pm_domain *new_subdomain);
149 extern int pm_genpd_add_subdomain_names(const char *master_name,
150 const char *subdomain_name);
151 extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
152 struct generic_pm_domain *target);
153 extern int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state);
154 extern int pm_genpd_name_attach_cpuidle(const char *name, int state);
155 extern int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd);
156 extern int pm_genpd_name_detach_cpuidle(const char *name);
157 extern void pm_genpd_init(struct generic_pm_domain *genpd,
158 struct dev_power_governor *gov, bool is_off);
160 extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
161 extern int pm_genpd_name_poweron(const char *domain_name);
163 extern bool default_stop_ok(struct device *dev);
165 extern struct dev_power_governor pm_domain_always_on_gov;
168 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
170 return ERR_PTR(-ENOSYS);
172 static inline struct generic_pm_domain *dev_to_genpd(struct device *dev)
174 return ERR_PTR(-ENOSYS);
176 static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
178 struct gpd_timing_data *td)
182 static inline int __pm_genpd_of_add_device(struct device_node *genpd_node,
184 struct gpd_timing_data *td)
188 static inline int __pm_genpd_name_add_device(const char *domain_name,
190 struct gpd_timing_data *td)
194 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
199 static inline void pm_genpd_dev_need_restore(struct device *dev, bool val) {}
200 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
201 struct generic_pm_domain *new_sd)
205 static inline int pm_genpd_add_subdomain_names(const char *master_name,
206 const char *subdomain_name)
210 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
211 struct generic_pm_domain *target)
215 static inline int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int st)
219 static inline int pm_genpd_name_attach_cpuidle(const char *name, int state)
223 static inline int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd)
227 static inline int pm_genpd_name_detach_cpuidle(const char *name)
231 static inline void pm_genpd_init(struct generic_pm_domain *genpd,
232 struct dev_power_governor *gov, bool is_off)
235 static inline int pm_genpd_poweron(struct generic_pm_domain *genpd)
239 static inline int pm_genpd_name_poweron(const char *domain_name)
243 static inline bool default_stop_ok(struct device *dev)
247 #define simple_qos_governor NULL
248 #define pm_domain_always_on_gov NULL
251 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
254 return __pm_genpd_add_device(genpd, dev, NULL);
257 static inline int pm_genpd_of_add_device(struct device_node *genpd_node,
260 return __pm_genpd_of_add_device(genpd_node, dev, NULL);
263 static inline int pm_genpd_name_add_device(const char *domain_name,
266 return __pm_genpd_name_add_device(domain_name, dev, NULL);
269 #ifdef CONFIG_PM_GENERIC_DOMAINS_RUNTIME
270 extern void genpd_queue_power_off_work(struct generic_pm_domain *genpd);
271 extern void pm_genpd_poweroff_unused(void);
273 static inline void genpd_queue_power_off_work(struct generic_pm_domain *gpd) {}
274 static inline void pm_genpd_poweroff_unused(void) {}
277 #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
278 extern void pm_genpd_syscore_switch(struct device *dev, bool suspend);
280 static inline void pm_genpd_syscore_switch(struct device *dev, bool suspend) {}
283 static inline void pm_genpd_syscore_poweroff(struct device *dev)
285 pm_genpd_syscore_switch(dev, true);
288 static inline void pm_genpd_syscore_poweron(struct device *dev)
290 pm_genpd_syscore_switch(dev, false);
293 #endif /* _LINUX_PM_DOMAIN_H */