xref: /linux-6.15/include/linux/pm_domain.h (revision 564f7dfd)
1 /*
2  * pm_domain.h - Definitions and headers related to device power domains.
3  *
4  * Copyright (C) 2011 Rafael J. Wysocki <[email protected]>, Renesas Electronics Corp.
5  *
6  * This file is released under the GPLv2.
7  */
8 
9 #ifndef _LINUX_PM_DOMAIN_H
10 #define _LINUX_PM_DOMAIN_H
11 
12 #include <linux/device.h>
13 #include <linux/mutex.h>
14 #include <linux/pm.h>
15 #include <linux/err.h>
16 #include <linux/of.h>
17 #include <linux/notifier.h>
18 #include <linux/spinlock.h>
19 
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 */
24 
25 enum gpd_status {
26 	GPD_STATE_ACTIVE = 0,	/* PM domain is active */
27 	GPD_STATE_POWER_OFF,	/* PM domain is off */
28 };
29 
30 struct dev_power_governor {
31 	bool (*power_down_ok)(struct dev_pm_domain *domain);
32 	bool (*suspend_ok)(struct device *dev);
33 };
34 
35 struct gpd_dev_ops {
36 	int (*start)(struct device *dev);
37 	int (*stop)(struct device *dev);
38 	bool (*active_wakeup)(struct device *dev);
39 };
40 
41 struct genpd_power_state {
42 	s64 power_off_latency_ns;
43 	s64 power_on_latency_ns;
44 	s64 residency_ns;
45 	struct fwnode_handle *fwnode;
46 };
47 
48 struct genpd_lock_ops;
49 
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 */
59 	bool has_provider;
60 	const char *name;
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,
73 			  struct device *dev);
74 	void (*detach_dev)(struct generic_pm_domain *domain,
75 			   struct device *dev);
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;
82 	union {
83 		struct mutex mlock;
84 		struct {
85 			spinlock_t slock;
86 			unsigned long lock_flags;
87 		};
88 	};
89 
90 };
91 
92 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
93 {
94 	return container_of(pd, struct generic_pm_domain, domain);
95 }
96 
97 struct gpd_link {
98 	struct generic_pm_domain *master;
99 	struct list_head master_node;
100 	struct generic_pm_domain *slave;
101 	struct list_head slave_node;
102 };
103 
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;
110 };
111 
112 struct pm_domain_data {
113 	struct list_head list_node;
114 	struct device *dev;
115 };
116 
117 struct generic_pm_domain_data {
118 	struct pm_domain_data base;
119 	struct gpd_timing_data td;
120 	struct notifier_block nb;
121 };
122 
123 #ifdef CONFIG_PM_GENERIC_DOMAINS
124 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
125 {
126 	return container_of(pdd, struct generic_pm_domain_data, base);
127 }
128 
129 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
130 {
131 	return to_gpd_data(dev->power.subsys_data->domain_data);
132 }
133 
134 extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
135 				 struct device *dev,
136 				 struct gpd_timing_data *td);
137 
138 extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
139 				  struct device *dev);
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);
147 
148 extern struct dev_power_governor simple_qos_governor;
149 extern struct dev_power_governor pm_domain_always_on_gov;
150 #else
151 
152 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
153 {
154 	return ERR_PTR(-ENOSYS);
155 }
156 static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
157 					struct device *dev,
158 					struct gpd_timing_data *td)
159 {
160 	return -ENOSYS;
161 }
162 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
163 					 struct device *dev)
164 {
165 	return -ENOSYS;
166 }
167 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
168 					 struct generic_pm_domain *new_sd)
169 {
170 	return -ENOSYS;
171 }
172 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
173 					    struct generic_pm_domain *target)
174 {
175 	return -ENOSYS;
176 }
177 static inline int pm_genpd_init(struct generic_pm_domain *genpd,
178 				struct dev_power_governor *gov, bool is_off)
179 {
180 	return -ENOSYS;
181 }
182 static inline int pm_genpd_remove(struct generic_pm_domain *genpd)
183 {
184 	return -ENOTSUPP;
185 }
186 
187 #define simple_qos_governor		(*(struct dev_power_governor *)(NULL))
188 #define pm_domain_always_on_gov		(*(struct dev_power_governor *)(NULL))
189 #endif
190 
191 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
192 				      struct device *dev)
193 {
194 	return __pm_genpd_add_device(genpd, dev, NULL);
195 }
196 
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);
200 #else
201 static inline void pm_genpd_syscore_poweroff(struct device *dev) {}
202 static inline void pm_genpd_syscore_poweron(struct device *dev) {}
203 #endif
204 
205 /* OF PM domain providers */
206 struct of_device_id;
207 
208 struct genpd_onecell_data {
209 	struct generic_pm_domain **domains;
210 	unsigned int num_domains;
211 };
212 
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,
220 			       struct device *dev);
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);
226 
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)
231 {
232 	return -ENOTSUPP;
233 }
234 
235 static inline int of_genpd_add_provider_onecell(struct device_node *np,
236 					struct genpd_onecell_data *data)
237 {
238 	return -ENOTSUPP;
239 }
240 
241 static inline void of_genpd_del_provider(struct device_node *np) {}
242 
243 static inline int of_genpd_add_device(struct of_phandle_args *args,
244 				      struct device *dev)
245 {
246 	return -ENODEV;
247 }
248 
249 static inline int of_genpd_add_subdomain(struct of_phandle_args *parent,
250 					 struct of_phandle_args *new_subdomain)
251 {
252 	return -ENODEV;
253 }
254 
255 static inline int of_genpd_parse_idle_states(struct device_node *dn,
256 			struct genpd_power_state **states, int *n)
257 {
258 	return -ENODEV;
259 }
260 
261 static inline int genpd_dev_pm_attach(struct device *dev)
262 {
263 	return -ENODEV;
264 }
265 
266 static inline
267 struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
268 {
269 	return ERR_PTR(-ENOTSUPP);
270 }
271 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
272 
273 #ifdef CONFIG_PM
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);
277 #else
278 static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
279 {
280 	return -ENODEV;
281 }
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) {}
285 #endif
286 
287 #endif /* _LINUX_PM_DOMAIN_H */
288