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/err.h>
16 GPD_STATE_ACTIVE = 0, /* PM domain is active */
17 GPD_STATE_WAIT_MASTER, /* PM domain's master is being waited for */
18 GPD_STATE_BUSY, /* Something is happening to the PM domain */
19 GPD_STATE_REPEAT, /* Power off in progress, to be repeated */
20 GPD_STATE_POWER_OFF, /* PM domain is off */
23 struct dev_power_governor {
24 bool (*power_down_ok)(struct dev_pm_domain *domain);
25 bool (*stop_ok)(struct device *dev);
29 int (*start)(struct device *dev);
30 int (*stop)(struct device *dev);
31 int (*save_state)(struct device *dev);
32 int (*restore_state)(struct device *dev);
33 int (*suspend)(struct device *dev);
34 int (*suspend_late)(struct device *dev);
35 int (*resume_early)(struct device *dev);
36 int (*resume)(struct device *dev);
37 int (*freeze)(struct device *dev);
38 int (*freeze_late)(struct device *dev);
39 int (*thaw_early)(struct device *dev);
40 int (*thaw)(struct device *dev);
41 bool (*active_wakeup)(struct device *dev);
44 struct generic_pm_domain {
45 struct dev_pm_domain domain; /* PM domain operations */
46 struct list_head gpd_list_node; /* Node in the global PM domains list */
47 struct list_head master_links; /* Links with PM domain as a master */
48 struct list_head slave_links; /* Links with PM domain as a slave */
49 struct list_head dev_list; /* List of devices */
51 struct dev_power_governor *gov;
52 struct work_struct power_off_work;
53 unsigned int in_progress; /* Number of devices being suspended now */
54 atomic_t sd_count; /* Number of subdomains with power "on" */
55 enum gpd_status status; /* Current state of the domain */
56 wait_queue_head_t status_wait_queue;
57 struct task_struct *poweroff_task; /* Powering off task */
58 unsigned int resume_count; /* Number of devices being resumed */
59 unsigned int device_count; /* Number of devices */
60 unsigned int suspended_count; /* System suspend device counter */
61 unsigned int prepared_count; /* Suspend counter of prepared devices */
62 bool suspend_power_off; /* Power status before system suspend */
63 bool dev_irq_safe; /* Device callbacks are IRQ-safe */
64 int (*power_off)(struct generic_pm_domain *domain);
65 s64 power_off_latency_ns;
66 int (*power_on)(struct generic_pm_domain *domain);
67 s64 power_on_latency_ns;
68 struct gpd_dev_ops dev_ops;
69 s64 break_even_ns; /* Power break even for the entire domain. */
70 s64 max_off_time_ns; /* Maximum allowed "suspended" time. */
71 ktime_t power_off_time;
74 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
76 return container_of(pd, struct generic_pm_domain, domain);
80 struct generic_pm_domain *master;
81 struct list_head master_node;
82 struct generic_pm_domain *slave;
83 struct list_head slave_node;
86 struct gpd_timing_data {
89 s64 save_state_latency_ns;
90 s64 restore_state_latency_ns;
94 struct generic_pm_domain_data {
95 struct pm_domain_data base;
96 struct gpd_dev_ops ops;
97 struct gpd_timing_data td;
101 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
103 return container_of(pdd, struct generic_pm_domain_data, base);
106 #ifdef CONFIG_PM_GENERIC_DOMAINS
107 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
109 return to_gpd_data(dev->power.subsys_data->domain_data);
112 extern struct dev_power_governor simple_qos_governor;
114 extern struct generic_pm_domain *dev_to_genpd(struct device *dev);
115 extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
117 struct gpd_timing_data *td);
119 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
122 return __pm_genpd_add_device(genpd, dev, NULL);
125 extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
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 int pm_genpd_add_callbacks(struct device *dev,
132 struct gpd_dev_ops *ops,
133 struct gpd_timing_data *td);
134 extern int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td);
135 extern void pm_genpd_init(struct generic_pm_domain *genpd,
136 struct dev_power_governor *gov, bool is_off);
138 extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
140 extern bool default_stop_ok(struct device *dev);
144 static inline struct generic_pm_domain *dev_to_genpd(struct device *dev)
146 return ERR_PTR(-ENOSYS);
148 static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
150 struct gpd_timing_data *td)
154 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
159 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
164 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
165 struct generic_pm_domain *new_sd)
169 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
170 struct generic_pm_domain *target)
174 static inline int pm_genpd_add_callbacks(struct device *dev,
175 struct gpd_dev_ops *ops,
176 struct gpd_timing_data *td)
180 static inline int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td)
184 static inline void pm_genpd_init(struct generic_pm_domain *genpd, bool is_off)
187 static inline int pm_genpd_poweron(struct generic_pm_domain *genpd)
191 static inline bool default_stop_ok(struct device *dev)
197 static inline int pm_genpd_remove_callbacks(struct device *dev)
199 return __pm_genpd_remove_callbacks(dev, true);
202 #ifdef CONFIG_PM_GENERIC_DOMAINS_RUNTIME
203 extern void genpd_queue_power_off_work(struct generic_pm_domain *genpd);
204 extern void pm_genpd_poweroff_unused(void);
206 static inline void genpd_queue_power_off_work(struct generic_pm_domain *gpd) {}
207 static inline void pm_genpd_poweroff_unused(void) {}
210 #endif /* _LINUX_PM_DOMAIN_H */