2 * pm_domain.h - Definitions and headers related to device power domains.
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;
124 #ifdef CONFIG_PM_GENERIC_DOMAINS
125 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
127 return container_of(pdd, struct generic_pm_domain_data, base);
130 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
132 return to_gpd_data(dev->power.subsys_data->domain_data);
135 extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
137 struct gpd_timing_data *td);
139 extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
141 extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
142 struct generic_pm_domain *new_subdomain);
143 extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
144 struct generic_pm_domain *target);
145 extern int pm_genpd_init(struct generic_pm_domain *genpd,
146 struct dev_power_governor *gov, bool is_off);
147 extern int pm_genpd_remove(struct generic_pm_domain *genpd);
149 extern struct dev_power_governor simple_qos_governor;
150 extern struct dev_power_governor pm_domain_always_on_gov;
153 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
155 return ERR_PTR(-ENOSYS);
157 static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
159 struct gpd_timing_data *td)
163 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
168 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
169 struct generic_pm_domain *new_sd)
173 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
174 struct generic_pm_domain *target)
178 static inline int pm_genpd_init(struct generic_pm_domain *genpd,
179 struct dev_power_governor *gov, bool is_off)
183 static inline int pm_genpd_remove(struct generic_pm_domain *genpd)
188 #define simple_qos_governor (*(struct dev_power_governor *)(NULL))
189 #define pm_domain_always_on_gov (*(struct dev_power_governor *)(NULL))
192 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
195 return __pm_genpd_add_device(genpd, dev, NULL);
198 #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
199 extern void pm_genpd_syscore_poweroff(struct device *dev);
200 extern void pm_genpd_syscore_poweron(struct device *dev);
202 static inline void pm_genpd_syscore_poweroff(struct device *dev) {}
203 static inline void pm_genpd_syscore_poweron(struct device *dev) {}
206 /* OF PM domain providers */
209 typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args,
212 struct genpd_onecell_data {
213 struct generic_pm_domain **domains;
214 unsigned int num_domains;
218 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
219 int of_genpd_add_provider_simple(struct device_node *np,
220 struct generic_pm_domain *genpd);
221 int of_genpd_add_provider_onecell(struct device_node *np,
222 struct genpd_onecell_data *data);
223 void of_genpd_del_provider(struct device_node *np);
224 extern int of_genpd_add_device(struct of_phandle_args *args,
226 extern int of_genpd_add_subdomain(struct of_phandle_args *parent,
227 struct of_phandle_args *new_subdomain);
228 extern struct generic_pm_domain *of_genpd_remove_last(struct device_node *np);
229 extern int of_genpd_parse_idle_states(struct device_node *dn,
230 struct genpd_power_state **states, int *n);
232 int genpd_dev_pm_attach(struct device *dev);
233 #else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
234 static inline int of_genpd_add_provider_simple(struct device_node *np,
235 struct generic_pm_domain *genpd)
240 static inline int of_genpd_add_provider_onecell(struct device_node *np,
241 struct genpd_onecell_data *data)
246 static inline void of_genpd_del_provider(struct device_node *np) {}
248 static inline int of_genpd_add_device(struct of_phandle_args *args,
254 static inline int of_genpd_add_subdomain(struct of_phandle_args *parent,
255 struct of_phandle_args *new_subdomain)
260 static inline int of_genpd_parse_idle_states(struct device_node *dn,
261 struct genpd_power_state **states, int *n)
266 static inline int genpd_dev_pm_attach(struct device *dev)
272 struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
274 return ERR_PTR(-ENOTSUPP);
276 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
279 extern int dev_pm_domain_attach(struct device *dev, bool power_on);
280 extern void dev_pm_domain_detach(struct device *dev, bool power_off);
281 extern void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);
283 static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
287 static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
288 static inline void dev_pm_domain_set(struct device *dev,
289 struct dev_pm_domain *pd) {}
292 #endif /* _LINUX_PM_DOMAIN_H */