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/spinlock.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 */
22 #define GENPD_FLAG_IRQ_SAFE (1U << 1) /* PM domain operates in atomic */
23 #define GENPD_FLAG_ALWAYS_ON (1U << 2) /* PM domain is always powered on */
26 GPD_STATE_ACTIVE = 0, /* PM domain is active */
27 GPD_STATE_POWER_OFF, /* PM domain is off */
30 struct dev_power_governor {
31 bool (*power_down_ok)(struct dev_pm_domain *domain);
32 bool (*suspend_ok)(struct device *dev);
36 int (*start)(struct device *dev);
37 int (*stop)(struct device *dev);
38 bool (*active_wakeup)(struct device *dev);
41 struct genpd_power_state {
42 s64 power_off_latency_ns;
43 s64 power_on_latency_ns;
45 struct fwnode_handle *fwnode;
48 struct genpd_lock_ops;
50 struct generic_pm_domain {
51 struct dev_pm_domain domain; /* PM domain operations */
52 struct list_head gpd_list_node; /* Node in the global PM domains list */
53 struct list_head master_links; /* Links with PM domain as a master */
54 struct list_head slave_links; /* Links with PM domain as a slave */
55 struct list_head dev_list; /* List of devices */
56 struct dev_power_governor *gov;
57 struct work_struct power_off_work;
58 struct fwnode_handle *provider; /* Identity of the domain provider */
61 atomic_t sd_count; /* Number of subdomains with power "on" */
62 enum gpd_status status; /* Current state of the domain */
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 int (*power_off)(struct generic_pm_domain *domain);
67 int (*power_on)(struct generic_pm_domain *domain);
68 struct gpd_dev_ops dev_ops;
69 s64 max_off_time_ns; /* Maximum allowed "suspended" time. */
70 bool max_off_time_changed;
71 bool cached_power_down_ok;
72 int (*attach_dev)(struct generic_pm_domain *domain,
74 void (*detach_dev)(struct generic_pm_domain *domain,
76 unsigned int flags; /* Bit field of configs for genpd */
77 struct genpd_power_state *states;
78 unsigned int state_count; /* number of states */
79 unsigned int state_idx; /* state that genpd will go to when off */
80 void *free; /* Free the state that was allocated for default */
81 const struct genpd_lock_ops *lock_ops;
86 unsigned long lock_flags;
92 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
94 return container_of(pd, struct generic_pm_domain, domain);
98 struct generic_pm_domain *master;
99 struct list_head master_node;
100 struct generic_pm_domain *slave;
101 struct list_head slave_node;
104 struct gpd_timing_data {
105 s64 suspend_latency_ns;
106 s64 resume_latency_ns;
107 s64 effective_constraint_ns;
108 bool constraint_changed;
109 bool cached_suspend_ok;
112 struct pm_domain_data {
113 struct list_head list_node;
117 struct generic_pm_domain_data {
118 struct pm_domain_data base;
119 struct gpd_timing_data td;
120 struct notifier_block nb;
123 #ifdef CONFIG_PM_GENERIC_DOMAINS
124 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
126 return container_of(pdd, struct generic_pm_domain_data, base);
129 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
131 return to_gpd_data(dev->power.subsys_data->domain_data);
134 extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
136 struct gpd_timing_data *td);
138 extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
140 extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
141 struct generic_pm_domain *new_subdomain);
142 extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
143 struct generic_pm_domain *target);
144 extern int pm_genpd_init(struct generic_pm_domain *genpd,
145 struct dev_power_governor *gov, bool is_off);
146 extern int pm_genpd_remove(struct generic_pm_domain *genpd);
148 extern struct dev_power_governor simple_qos_governor;
149 extern struct dev_power_governor pm_domain_always_on_gov;
152 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
154 return ERR_PTR(-ENOSYS);
156 static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
158 struct gpd_timing_data *td)
162 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
167 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
168 struct generic_pm_domain *new_sd)
172 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
173 struct generic_pm_domain *target)
177 static inline int pm_genpd_init(struct generic_pm_domain *genpd,
178 struct dev_power_governor *gov, bool is_off)
182 static inline int pm_genpd_remove(struct generic_pm_domain *genpd)
187 #define simple_qos_governor (*(struct dev_power_governor *)(NULL))
188 #define pm_domain_always_on_gov (*(struct dev_power_governor *)(NULL))
191 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
194 return __pm_genpd_add_device(genpd, dev, NULL);
197 #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
198 extern void pm_genpd_syscore_poweroff(struct device *dev);
199 extern void pm_genpd_syscore_poweron(struct device *dev);
201 static inline void pm_genpd_syscore_poweroff(struct device *dev) {}
202 static inline void pm_genpd_syscore_poweron(struct device *dev) {}
205 /* OF PM domain providers */
208 struct genpd_onecell_data {
209 struct generic_pm_domain **domains;
210 unsigned int num_domains;
213 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
214 int of_genpd_add_provider_simple(struct device_node *np,
215 struct generic_pm_domain *genpd);
216 int of_genpd_add_provider_onecell(struct device_node *np,
217 struct genpd_onecell_data *data);
218 void of_genpd_del_provider(struct device_node *np);
219 extern int of_genpd_add_device(struct of_phandle_args *args,
221 extern int of_genpd_add_subdomain(struct of_phandle_args *parent,
222 struct of_phandle_args *new_subdomain);
223 extern struct generic_pm_domain *of_genpd_remove_last(struct device_node *np);
224 extern int of_genpd_parse_idle_states(struct device_node *dn,
225 struct genpd_power_state **states, int *n);
227 int genpd_dev_pm_attach(struct device *dev);
228 #else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
229 static inline int of_genpd_add_provider_simple(struct device_node *np,
230 struct generic_pm_domain *genpd)
235 static inline int of_genpd_add_provider_onecell(struct device_node *np,
236 struct genpd_onecell_data *data)
241 static inline void of_genpd_del_provider(struct device_node *np) {}
243 static inline int of_genpd_add_device(struct of_phandle_args *args,
249 static inline int of_genpd_add_subdomain(struct of_phandle_args *parent,
250 struct of_phandle_args *new_subdomain)
255 static inline int of_genpd_parse_idle_states(struct device_node *dn,
256 struct genpd_power_state **states, int *n)
261 static inline int genpd_dev_pm_attach(struct device *dev)
267 struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
269 return ERR_PTR(-ENOTSUPP);
271 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
274 extern int dev_pm_domain_attach(struct device *dev, bool power_on);
275 extern void dev_pm_domain_detach(struct device *dev, bool power_off);
276 extern void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);
278 static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
282 static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
283 static inline void dev_pm_domain_set(struct device *dev,
284 struct dev_pm_domain *pd) {}
287 #endif /* _LINUX_PM_DOMAIN_H */