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>
19 GPD_STATE_ACTIVE = 0, /* PM domain is active */
20 GPD_STATE_WAIT_MASTER, /* PM domain's master is being waited for */
21 GPD_STATE_BUSY, /* Something is happening to the PM domain */
22 GPD_STATE_REPEAT, /* Power off in progress, to be repeated */
23 GPD_STATE_POWER_OFF, /* PM domain is off */
26 struct dev_power_governor {
27 bool (*power_down_ok)(struct dev_pm_domain *domain);
28 bool (*stop_ok)(struct device *dev);
32 int (*start)(struct device *dev);
33 int (*stop)(struct device *dev);
34 int (*save_state)(struct device *dev);
35 int (*restore_state)(struct device *dev);
36 int (*suspend)(struct device *dev);
37 int (*suspend_late)(struct device *dev);
38 int (*resume_early)(struct device *dev);
39 int (*resume)(struct device *dev);
40 int (*freeze)(struct device *dev);
41 int (*freeze_late)(struct device *dev);
42 int (*thaw_early)(struct device *dev);
43 int (*thaw)(struct device *dev);
44 bool (*active_wakeup)(struct device *dev);
47 struct generic_pm_domain {
48 struct dev_pm_domain domain; /* PM domain operations */
49 struct list_head gpd_list_node; /* Node in the global PM domains list */
50 struct list_head master_links; /* Links with PM domain as a master */
51 struct list_head slave_links; /* Links with PM domain as a slave */
52 struct list_head dev_list; /* List of devices */
54 struct dev_power_governor *gov;
55 struct work_struct power_off_work;
57 unsigned int in_progress; /* Number of devices being suspended now */
58 atomic_t sd_count; /* Number of subdomains with power "on" */
59 enum gpd_status status; /* Current state of the domain */
60 wait_queue_head_t status_wait_queue;
61 struct task_struct *poweroff_task; /* Powering off task */
62 unsigned int resume_count; /* Number of devices being resumed */
63 unsigned int device_count; /* Number of devices */
64 unsigned int suspended_count; /* System suspend device counter */
65 unsigned int prepared_count; /* Suspend counter of prepared devices */
66 bool suspend_power_off; /* Power status before system suspend */
67 bool dev_irq_safe; /* Device callbacks are IRQ-safe */
68 int (*power_off)(struct generic_pm_domain *domain);
69 s64 power_off_latency_ns;
70 int (*power_on)(struct generic_pm_domain *domain);
71 s64 power_on_latency_ns;
72 struct gpd_dev_ops dev_ops;
73 s64 break_even_ns; /* Power break even for the entire domain. */
74 s64 max_off_time_ns; /* Maximum allowed "suspended" time. */
75 ktime_t power_off_time;
76 struct device_node *of_node; /* Node in device tree */
79 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
81 return container_of(pd, struct generic_pm_domain, domain);
85 struct generic_pm_domain *master;
86 struct list_head master_node;
87 struct generic_pm_domain *slave;
88 struct list_head slave_node;
91 struct gpd_timing_data {
94 s64 save_state_latency_ns;
95 s64 restore_state_latency_ns;
99 struct generic_pm_domain_data {
100 struct pm_domain_data base;
101 struct gpd_dev_ops ops;
102 struct gpd_timing_data td;
107 #ifdef CONFIG_PM_GENERIC_DOMAINS
108 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
110 return container_of(pdd, struct generic_pm_domain_data, base);
113 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
115 return to_gpd_data(dev->power.subsys_data->domain_data);
118 extern struct dev_power_governor simple_qos_governor;
120 extern struct generic_pm_domain *dev_to_genpd(struct device *dev);
121 extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
123 struct gpd_timing_data *td);
125 extern int __pm_genpd_of_add_device(struct device_node *genpd_node,
127 struct gpd_timing_data *td);
129 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
132 return __pm_genpd_add_device(genpd, dev, NULL);
135 static inline int pm_genpd_of_add_device(struct device_node *genpd_node,
138 return __pm_genpd_of_add_device(genpd_node, dev, NULL);
141 extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
143 extern void pm_genpd_dev_always_on(struct device *dev, bool val);
144 extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
145 struct generic_pm_domain *new_subdomain);
146 extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
147 struct generic_pm_domain *target);
148 extern int pm_genpd_add_callbacks(struct device *dev,
149 struct gpd_dev_ops *ops,
150 struct gpd_timing_data *td);
151 extern int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td);
152 extern void pm_genpd_init(struct generic_pm_domain *genpd,
153 struct dev_power_governor *gov, bool is_off);
155 extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
157 extern bool default_stop_ok(struct device *dev);
159 extern struct dev_power_governor pm_domain_always_on_gov;
162 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
164 return ERR_PTR(-ENOSYS);
166 static inline struct generic_pm_domain *dev_to_genpd(struct device *dev)
168 return ERR_PTR(-ENOSYS);
170 static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
172 struct gpd_timing_data *td)
176 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
181 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
186 static inline void pm_genpd_dev_always_on(struct device *dev, bool val) {}
187 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
188 struct generic_pm_domain *new_sd)
192 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
193 struct generic_pm_domain *target)
197 static inline int pm_genpd_add_callbacks(struct device *dev,
198 struct gpd_dev_ops *ops,
199 struct gpd_timing_data *td)
203 static inline int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td)
207 static inline void pm_genpd_init(struct generic_pm_domain *genpd,
208 struct dev_power_governor *gov, bool is_off)
211 static inline int pm_genpd_poweron(struct generic_pm_domain *genpd)
215 static inline bool default_stop_ok(struct device *dev)
219 #define simple_qos_governor NULL
220 #define pm_domain_always_on_gov NULL
223 static inline int pm_genpd_remove_callbacks(struct device *dev)
225 return __pm_genpd_remove_callbacks(dev, true);
228 #ifdef CONFIG_PM_GENERIC_DOMAINS_RUNTIME
229 extern void genpd_queue_power_off_work(struct generic_pm_domain *genpd);
230 extern void pm_genpd_poweroff_unused(void);
232 static inline void genpd_queue_power_off_work(struct generic_pm_domain *gpd) {}
233 static inline void pm_genpd_poweroff_unused(void) {}
236 #endif /* _LINUX_PM_DOMAIN_H */