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>
20 /* Defines used for the flags field in the struct generic_pm_domain */
21 #define GENPD_FLAG_PM_CLK (1U << 0) /* PM domain uses PM clk */
24 GPD_STATE_ACTIVE = 0, /* PM domain is active */
25 GPD_STATE_WAIT_MASTER, /* PM domain's master is being waited for */
26 GPD_STATE_BUSY, /* Something is happening to the PM domain */
27 GPD_STATE_REPEAT, /* Power off in progress, to be repeated */
28 GPD_STATE_POWER_OFF, /* PM domain is off */
31 struct dev_power_governor {
32 bool (*power_down_ok)(struct dev_pm_domain *domain);
33 bool (*stop_ok)(struct device *dev);
37 int (*start)(struct device *dev);
38 int (*stop)(struct device *dev);
39 int (*save_state)(struct device *dev);
40 int (*restore_state)(struct device *dev);
41 bool (*active_wakeup)(struct device *dev);
44 struct gpd_cpuidle_data {
45 unsigned int saved_exit_latency;
46 struct cpuidle_state *idle_state;
49 struct generic_pm_domain {
50 struct dev_pm_domain domain; /* PM domain operations */
51 struct list_head gpd_list_node; /* Node in the global PM domains list */
52 struct list_head master_links; /* Links with PM domain as a master */
53 struct list_head slave_links; /* Links with PM domain as a slave */
54 struct list_head dev_list; /* List of devices */
56 struct dev_power_governor *gov;
57 struct work_struct power_off_work;
59 unsigned int in_progress; /* Number of devices being suspended now */
60 atomic_t sd_count; /* Number of subdomains with power "on" */
61 enum gpd_status status; /* Current state of the domain */
62 wait_queue_head_t status_wait_queue;
63 struct task_struct *poweroff_task; /* Powering off task */
64 unsigned int resume_count; /* Number of devices being resumed */
65 unsigned int device_count; /* Number of devices */
66 unsigned int suspended_count; /* System suspend device counter */
67 unsigned int prepared_count; /* Suspend counter of prepared devices */
68 bool suspend_power_off; /* Power status before system suspend */
69 int (*power_off)(struct generic_pm_domain *domain);
70 s64 power_off_latency_ns;
71 int (*power_on)(struct generic_pm_domain *domain);
72 s64 power_on_latency_ns;
73 struct gpd_dev_ops dev_ops;
74 s64 max_off_time_ns; /* Maximum allowed "suspended" time. */
75 bool max_off_time_changed;
76 bool cached_power_down_ok;
77 struct gpd_cpuidle_data *cpuidle_data;
78 int (*attach_dev)(struct generic_pm_domain *domain,
80 void (*detach_dev)(struct generic_pm_domain *domain,
82 unsigned int flags; /* Bit field of configs for genpd */
85 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
87 return container_of(pd, struct generic_pm_domain, domain);
91 struct generic_pm_domain *master;
92 struct list_head master_node;
93 struct generic_pm_domain *slave;
94 struct list_head slave_node;
97 struct gpd_timing_data {
100 s64 save_state_latency_ns;
101 s64 restore_state_latency_ns;
102 s64 effective_constraint_ns;
103 bool constraint_changed;
107 struct pm_domain_data {
108 struct list_head list_node;
112 struct generic_pm_domain_data {
113 struct pm_domain_data base;
114 struct gpd_timing_data td;
115 struct notifier_block nb;
117 unsigned int refcount;
121 #ifdef CONFIG_PM_GENERIC_DOMAINS
122 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
124 return container_of(pdd, struct generic_pm_domain_data, base);
127 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
129 return to_gpd_data(dev->power.subsys_data->domain_data);
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_name_add_device(const char *domain_name,
139 struct gpd_timing_data *td);
141 extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
143 extern void pm_genpd_dev_need_restore(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_add_subdomain_names(const char *master_name,
147 const char *subdomain_name);
148 extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
149 struct generic_pm_domain *target);
150 extern int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state);
151 extern int pm_genpd_name_attach_cpuidle(const char *name, int state);
152 extern int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd);
153 extern int pm_genpd_name_detach_cpuidle(const char *name);
154 extern void pm_genpd_init(struct generic_pm_domain *genpd,
155 struct dev_power_governor *gov, bool is_off);
157 extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
158 extern int pm_genpd_name_poweron(const char *domain_name);
160 extern struct dev_power_governor simple_qos_governor;
161 extern struct dev_power_governor pm_domain_always_on_gov;
164 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
166 return ERR_PTR(-ENOSYS);
168 static inline struct generic_pm_domain *dev_to_genpd(struct device *dev)
170 return ERR_PTR(-ENOSYS);
172 static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
174 struct gpd_timing_data *td)
178 static inline int __pm_genpd_name_add_device(const char *domain_name,
180 struct gpd_timing_data *td)
184 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
189 static inline void pm_genpd_dev_need_restore(struct device *dev, bool val) {}
190 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
191 struct generic_pm_domain *new_sd)
195 static inline int pm_genpd_add_subdomain_names(const char *master_name,
196 const char *subdomain_name)
200 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
201 struct generic_pm_domain *target)
205 static inline int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int st)
209 static inline int pm_genpd_name_attach_cpuidle(const char *name, int state)
213 static inline int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd)
217 static inline int pm_genpd_name_detach_cpuidle(const char *name)
221 static inline void pm_genpd_init(struct generic_pm_domain *genpd,
222 struct dev_power_governor *gov, bool is_off)
225 static inline int pm_genpd_poweron(struct generic_pm_domain *genpd)
229 static inline int pm_genpd_name_poweron(const char *domain_name)
233 #define simple_qos_governor NULL
234 #define pm_domain_always_on_gov NULL
237 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
240 return __pm_genpd_add_device(genpd, dev, NULL);
243 static inline int pm_genpd_name_add_device(const char *domain_name,
246 return __pm_genpd_name_add_device(domain_name, dev, NULL);
249 #ifdef CONFIG_PM_GENERIC_DOMAINS_RUNTIME
250 extern void pm_genpd_poweroff_unused(void);
252 static inline void pm_genpd_poweroff_unused(void) {}
255 #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
256 extern void pm_genpd_syscore_poweroff(struct device *dev);
257 extern void pm_genpd_syscore_poweron(struct device *dev);
259 static inline void pm_genpd_syscore_poweroff(struct device *dev) {}
260 static inline void pm_genpd_syscore_poweron(struct device *dev) {}
263 /* OF PM domain providers */
266 struct genpd_onecell_data {
267 struct generic_pm_domain **domains;
268 unsigned int num_domains;
271 typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args,
274 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
275 int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
277 void of_genpd_del_provider(struct device_node *np);
278 struct generic_pm_domain *of_genpd_get_from_provider(
279 struct of_phandle_args *genpdspec);
281 struct generic_pm_domain *__of_genpd_xlate_simple(
282 struct of_phandle_args *genpdspec,
284 struct generic_pm_domain *__of_genpd_xlate_onecell(
285 struct of_phandle_args *genpdspec,
288 int genpd_dev_pm_attach(struct device *dev);
289 #else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
290 static inline int __of_genpd_add_provider(struct device_node *np,
291 genpd_xlate_t xlate, void *data)
295 static inline void of_genpd_del_provider(struct device_node *np) {}
297 static inline struct generic_pm_domain *of_genpd_get_from_provider(
298 struct of_phandle_args *genpdspec)
303 #define __of_genpd_xlate_simple NULL
304 #define __of_genpd_xlate_onecell NULL
306 static inline int genpd_dev_pm_attach(struct device *dev)
310 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
312 static inline int of_genpd_add_provider_simple(struct device_node *np,
313 struct generic_pm_domain *genpd)
315 return __of_genpd_add_provider(np, __of_genpd_xlate_simple, genpd);
317 static inline int of_genpd_add_provider_onecell(struct device_node *np,
318 struct genpd_onecell_data *data)
320 return __of_genpd_add_provider(np, __of_genpd_xlate_onecell, data);
324 extern int dev_pm_domain_attach(struct device *dev, bool power_on);
325 extern void dev_pm_domain_detach(struct device *dev, bool power_off);
327 static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
331 static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
334 #endif /* _LINUX_PM_DOMAIN_H */