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>
19 /* Defines used for the flags field in the struct generic_pm_domain */
20 #define GENPD_FLAG_PM_CLK (1U << 0) /* PM domain uses PM clk */
23 GPD_STATE_ACTIVE = 0, /* PM domain is active */
24 GPD_STATE_POWER_OFF, /* PM domain is off */
27 struct dev_power_governor {
28 bool (*power_down_ok)(struct dev_pm_domain *domain);
29 bool (*stop_ok)(struct device *dev);
33 int (*start)(struct device *dev);
34 int (*stop)(struct device *dev);
35 int (*save_state)(struct device *dev);
36 int (*restore_state)(struct device *dev);
37 bool (*active_wakeup)(struct device *dev);
40 struct generic_pm_domain {
41 struct dev_pm_domain domain; /* PM domain operations */
42 struct list_head gpd_list_node; /* Node in the global PM domains list */
43 struct list_head master_links; /* Links with PM domain as a master */
44 struct list_head slave_links; /* Links with PM domain as a slave */
45 struct list_head dev_list; /* List of devices */
47 struct dev_power_governor *gov;
48 struct work_struct power_off_work;
50 atomic_t sd_count; /* Number of subdomains with power "on" */
51 enum gpd_status status; /* Current state of the domain */
52 unsigned int device_count; /* Number of devices */
53 unsigned int suspended_count; /* System suspend device counter */
54 unsigned int prepared_count; /* Suspend counter of prepared devices */
55 bool suspend_power_off; /* Power status before system suspend */
56 int (*power_off)(struct generic_pm_domain *domain);
57 s64 power_off_latency_ns;
58 int (*power_on)(struct generic_pm_domain *domain);
59 s64 power_on_latency_ns;
60 struct gpd_dev_ops dev_ops;
61 s64 max_off_time_ns; /* Maximum allowed "suspended" time. */
62 bool max_off_time_changed;
63 bool cached_power_down_ok;
64 int (*attach_dev)(struct generic_pm_domain *domain,
66 void (*detach_dev)(struct generic_pm_domain *domain,
68 unsigned int flags; /* Bit field of configs for genpd */
71 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
73 return container_of(pd, struct generic_pm_domain, domain);
77 struct generic_pm_domain *master;
78 struct list_head master_node;
79 struct generic_pm_domain *slave;
80 struct list_head slave_node;
83 struct gpd_timing_data {
86 s64 save_state_latency_ns;
87 s64 restore_state_latency_ns;
88 s64 effective_constraint_ns;
89 bool constraint_changed;
93 struct pm_domain_data {
94 struct list_head list_node;
98 struct generic_pm_domain_data {
99 struct pm_domain_data base;
100 struct gpd_timing_data td;
101 struct notifier_block nb;
104 #ifdef CONFIG_PM_GENERIC_DOMAINS
105 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
107 return container_of(pdd, struct generic_pm_domain_data, base);
110 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
112 return to_gpd_data(dev->power.subsys_data->domain_data);
115 extern struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev);
116 extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
118 struct gpd_timing_data *td);
120 extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
122 extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
123 struct generic_pm_domain *new_subdomain);
124 extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
125 struct generic_pm_domain *target);
126 extern void pm_genpd_init(struct generic_pm_domain *genpd,
127 struct dev_power_governor *gov, bool is_off);
129 extern struct dev_power_governor simple_qos_governor;
130 extern struct dev_power_governor pm_domain_always_on_gov;
133 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
135 return ERR_PTR(-ENOSYS);
137 static inline struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev)
141 static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
143 struct gpd_timing_data *td)
147 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
152 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
153 struct generic_pm_domain *new_sd)
157 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
158 struct generic_pm_domain *target)
162 static inline void pm_genpd_init(struct generic_pm_domain *genpd,
163 struct dev_power_governor *gov, bool is_off)
168 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
171 return __pm_genpd_add_device(genpd, dev, NULL);
174 #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
175 extern void pm_genpd_syscore_poweroff(struct device *dev);
176 extern void pm_genpd_syscore_poweron(struct device *dev);
178 static inline void pm_genpd_syscore_poweroff(struct device *dev) {}
179 static inline void pm_genpd_syscore_poweron(struct device *dev) {}
182 /* OF PM domain providers */
185 struct genpd_onecell_data {
186 struct generic_pm_domain **domains;
187 unsigned int num_domains;
190 typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args,
193 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
194 int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
196 void of_genpd_del_provider(struct device_node *np);
197 struct generic_pm_domain *of_genpd_get_from_provider(
198 struct of_phandle_args *genpdspec);
200 struct generic_pm_domain *__of_genpd_xlate_simple(
201 struct of_phandle_args *genpdspec,
203 struct generic_pm_domain *__of_genpd_xlate_onecell(
204 struct of_phandle_args *genpdspec,
207 int genpd_dev_pm_attach(struct device *dev);
208 #else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
209 static inline int __of_genpd_add_provider(struct device_node *np,
210 genpd_xlate_t xlate, void *data)
214 static inline void of_genpd_del_provider(struct device_node *np) {}
216 static inline struct generic_pm_domain *of_genpd_get_from_provider(
217 struct of_phandle_args *genpdspec)
222 #define __of_genpd_xlate_simple NULL
223 #define __of_genpd_xlate_onecell NULL
225 static inline int genpd_dev_pm_attach(struct device *dev)
229 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
231 static inline int of_genpd_add_provider_simple(struct device_node *np,
232 struct generic_pm_domain *genpd)
234 return __of_genpd_add_provider(np, __of_genpd_xlate_simple, genpd);
236 static inline int of_genpd_add_provider_onecell(struct device_node *np,
237 struct genpd_onecell_data *data)
239 return __of_genpd_add_provider(np, __of_genpd_xlate_onecell, data);
243 extern int dev_pm_domain_attach(struct device *dev, bool power_on);
244 extern void dev_pm_domain_detach(struct device *dev, bool power_off);
246 static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
250 static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
253 #endif /* _LINUX_PM_DOMAIN_H */