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 */
22 #define GENPD_MAX_NUM_STATES 8 /* Number of possible low power states */
25 GPD_STATE_ACTIVE = 0, /* PM domain is active */
26 GPD_STATE_POWER_OFF, /* PM domain is off */
29 struct dev_power_governor {
30 bool (*power_down_ok)(struct dev_pm_domain *domain);
31 bool (*suspend_ok)(struct device *dev);
35 int (*start)(struct device *dev);
36 int (*stop)(struct device *dev);
37 bool (*active_wakeup)(struct device *dev);
40 struct genpd_power_state {
41 s64 power_off_latency_ns;
42 s64 power_on_latency_ns;
45 struct generic_pm_domain {
46 struct dev_pm_domain domain; /* PM domain operations */
47 struct list_head gpd_list_node; /* Node in the global PM domains list */
48 struct list_head master_links; /* Links with PM domain as a master */
49 struct list_head slave_links; /* Links with PM domain as a slave */
50 struct list_head dev_list; /* List of devices */
52 struct dev_power_governor *gov;
53 struct work_struct power_off_work;
54 struct fwnode_handle *provider; /* Identity of the domain provider */
57 atomic_t sd_count; /* Number of subdomains with power "on" */
58 enum gpd_status status; /* Current state of the domain */
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 int (*power_off)(struct generic_pm_domain *domain);
63 int (*power_on)(struct generic_pm_domain *domain);
64 struct gpd_dev_ops dev_ops;
65 s64 max_off_time_ns; /* Maximum allowed "suspended" time. */
66 bool max_off_time_changed;
67 bool cached_power_down_ok;
68 int (*attach_dev)(struct generic_pm_domain *domain,
70 void (*detach_dev)(struct generic_pm_domain *domain,
72 unsigned int flags; /* Bit field of configs for genpd */
73 struct genpd_power_state states[GENPD_MAX_NUM_STATES];
74 unsigned int state_count; /* number of states */
75 unsigned int state_idx; /* state that genpd will go to when off */
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 {
92 s64 suspend_latency_ns;
93 s64 resume_latency_ns;
94 s64 effective_constraint_ns;
95 bool constraint_changed;
96 bool cached_suspend_ok;
99 struct pm_domain_data {
100 struct list_head list_node;
104 struct generic_pm_domain_data {
105 struct pm_domain_data base;
106 struct gpd_timing_data td;
107 struct notifier_block nb;
110 #ifdef CONFIG_PM_GENERIC_DOMAINS
111 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
113 return container_of(pdd, struct generic_pm_domain_data, base);
116 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
118 return to_gpd_data(dev->power.subsys_data->domain_data);
121 extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
123 struct gpd_timing_data *td);
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_init(struct generic_pm_domain *genpd,
132 struct dev_power_governor *gov, bool is_off);
133 extern int pm_genpd_remove(struct generic_pm_domain *genpd);
135 extern struct dev_power_governor simple_qos_governor;
136 extern struct dev_power_governor pm_domain_always_on_gov;
139 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
141 return ERR_PTR(-ENOSYS);
143 static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
145 struct gpd_timing_data *td)
149 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
154 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
155 struct generic_pm_domain *new_sd)
159 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
160 struct generic_pm_domain *target)
164 static inline int pm_genpd_init(struct generic_pm_domain *genpd,
165 struct dev_power_governor *gov, bool is_off)
169 static inline int pm_genpd_remove(struct generic_pm_domain *genpd)
175 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
178 return __pm_genpd_add_device(genpd, dev, NULL);
181 #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
182 extern void pm_genpd_syscore_poweroff(struct device *dev);
183 extern void pm_genpd_syscore_poweron(struct device *dev);
185 static inline void pm_genpd_syscore_poweroff(struct device *dev) {}
186 static inline void pm_genpd_syscore_poweron(struct device *dev) {}
189 /* OF PM domain providers */
192 struct genpd_onecell_data {
193 struct generic_pm_domain **domains;
194 unsigned int num_domains;
197 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
198 int of_genpd_add_provider_simple(struct device_node *np,
199 struct generic_pm_domain *genpd);
200 int of_genpd_add_provider_onecell(struct device_node *np,
201 struct genpd_onecell_data *data);
202 void of_genpd_del_provider(struct device_node *np);
203 extern int of_genpd_add_device(struct of_phandle_args *args,
205 extern int of_genpd_add_subdomain(struct of_phandle_args *parent,
206 struct of_phandle_args *new_subdomain);
207 extern struct generic_pm_domain *of_genpd_remove_last(struct device_node *np);
209 int genpd_dev_pm_attach(struct device *dev);
210 #else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
211 static inline int of_genpd_add_provider_simple(struct device_node *np,
212 struct generic_pm_domain *genpd)
217 static inline int of_genpd_add_provider_onecell(struct device_node *np,
218 struct genpd_onecell_data *data)
223 static inline void of_genpd_del_provider(struct device_node *np) {}
225 static inline int of_genpd_add_device(struct of_phandle_args *args,
231 static inline int of_genpd_add_subdomain(struct of_phandle_args *parent,
232 struct of_phandle_args *new_subdomain)
237 static inline int genpd_dev_pm_attach(struct device *dev)
243 struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
245 return ERR_PTR(-ENOTSUPP);
247 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
250 extern int dev_pm_domain_attach(struct device *dev, bool power_on);
251 extern void dev_pm_domain_detach(struct device *dev, bool power_off);
252 extern void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);
254 static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
258 static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
259 static inline void dev_pm_domain_set(struct device *dev,
260 struct dev_pm_domain *pd) {}
263 #endif /* _LINUX_PM_DOMAIN_H */