xref: /linux-6.15/include/linux/pm_domain.h (revision b64eedb8)
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/cpuidle.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 
23 enum gpd_status {
24 	GPD_STATE_ACTIVE = 0,	/* PM domain is active */
25 	GPD_STATE_WAIT_MASTER,	/* PM domain's master is being waited for */
26 	GPD_STATE_BUSY,		/* Something is happening to the PM domain */
27 	GPD_STATE_REPEAT,	/* Power off in progress, to be repeated */
28 	GPD_STATE_POWER_OFF,	/* PM domain is off */
29 };
30 
31 struct dev_power_governor {
32 	bool (*power_down_ok)(struct dev_pm_domain *domain);
33 	bool (*stop_ok)(struct device *dev);
34 };
35 
36 struct gpd_dev_ops {
37 	int (*start)(struct device *dev);
38 	int (*stop)(struct device *dev);
39 	int (*save_state)(struct device *dev);
40 	int (*restore_state)(struct device *dev);
41 	bool (*active_wakeup)(struct device *dev);
42 };
43 
44 struct gpd_cpuidle_data {
45 	unsigned int saved_exit_latency;
46 	struct cpuidle_state *idle_state;
47 };
48 
49 struct generic_pm_domain {
50 	struct dev_pm_domain domain;	/* PM domain operations */
51 	struct list_head gpd_list_node;	/* Node in the global PM domains list */
52 	struct list_head master_links;	/* Links with PM domain as a master */
53 	struct list_head slave_links;	/* Links with PM domain as a slave */
54 	struct list_head dev_list;	/* List of devices */
55 	struct mutex lock;
56 	struct dev_power_governor *gov;
57 	struct work_struct power_off_work;
58 	const char *name;
59 	unsigned int in_progress;	/* Number of devices being suspended now */
60 	atomic_t sd_count;	/* Number of subdomains with power "on" */
61 	enum gpd_status status;	/* Current state of the domain */
62 	wait_queue_head_t status_wait_queue;
63 	struct task_struct *poweroff_task;	/* Powering off task */
64 	unsigned int resume_count;	/* Number of devices being resumed */
65 	unsigned int device_count;	/* Number of devices */
66 	unsigned int suspended_count;	/* System suspend device counter */
67 	unsigned int prepared_count;	/* Suspend counter of prepared devices */
68 	bool suspend_power_off;	/* Power status before system suspend */
69 	int (*power_off)(struct generic_pm_domain *domain);
70 	s64 power_off_latency_ns;
71 	int (*power_on)(struct generic_pm_domain *domain);
72 	s64 power_on_latency_ns;
73 	struct gpd_dev_ops dev_ops;
74 	s64 max_off_time_ns;	/* Maximum allowed "suspended" time. */
75 	bool max_off_time_changed;
76 	bool cached_power_down_ok;
77 	struct gpd_cpuidle_data *cpuidle_data;
78 	int (*attach_dev)(struct generic_pm_domain *domain,
79 			  struct device *dev);
80 	void (*detach_dev)(struct generic_pm_domain *domain,
81 			   struct device *dev);
82 	unsigned int flags;		/* Bit field of configs for genpd */
83 };
84 
85 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
86 {
87 	return container_of(pd, struct generic_pm_domain, domain);
88 }
89 
90 struct gpd_link {
91 	struct generic_pm_domain *master;
92 	struct list_head master_node;
93 	struct generic_pm_domain *slave;
94 	struct list_head slave_node;
95 };
96 
97 struct gpd_timing_data {
98 	s64 stop_latency_ns;
99 	s64 start_latency_ns;
100 	s64 save_state_latency_ns;
101 	s64 restore_state_latency_ns;
102 	s64 effective_constraint_ns;
103 	bool constraint_changed;
104 	bool cached_stop_ok;
105 };
106 
107 struct pm_domain_data {
108 	struct list_head list_node;
109 	struct device *dev;
110 };
111 
112 struct generic_pm_domain_data {
113 	struct pm_domain_data base;
114 	struct gpd_timing_data td;
115 	struct notifier_block nb;
116 	struct mutex lock;
117 	unsigned int refcount;
118 	int need_restore;
119 };
120 
121 #ifdef CONFIG_PM_GENERIC_DOMAINS
122 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
123 {
124 	return container_of(pdd, struct generic_pm_domain_data, base);
125 }
126 
127 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
128 {
129 	return to_gpd_data(dev->power.subsys_data->domain_data);
130 }
131 
132 extern struct generic_pm_domain *dev_to_genpd(struct device *dev);
133 extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
134 				 struct device *dev,
135 				 struct gpd_timing_data *td);
136 
137 extern int __pm_genpd_name_add_device(const char *domain_name,
138 				      struct device *dev,
139 				      struct gpd_timing_data *td);
140 
141 extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
142 				  struct device *dev);
143 extern void pm_genpd_dev_need_restore(struct device *dev, bool val);
144 extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
145 				  struct generic_pm_domain *new_subdomain);
146 extern int pm_genpd_add_subdomain_names(const char *master_name,
147 					const char *subdomain_name);
148 extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
149 				     struct generic_pm_domain *target);
150 extern int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state);
151 extern int pm_genpd_name_attach_cpuidle(const char *name, int state);
152 extern int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd);
153 extern int pm_genpd_name_detach_cpuidle(const char *name);
154 extern void pm_genpd_init(struct generic_pm_domain *genpd,
155 			  struct dev_power_governor *gov, bool is_off);
156 
157 extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
158 extern int pm_genpd_name_poweron(const char *domain_name);
159 extern void pm_genpd_poweroff_unused(void);
160 
161 extern struct dev_power_governor simple_qos_governor;
162 extern struct dev_power_governor pm_domain_always_on_gov;
163 #else
164 
165 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
166 {
167 	return ERR_PTR(-ENOSYS);
168 }
169 static inline struct generic_pm_domain *dev_to_genpd(struct device *dev)
170 {
171 	return ERR_PTR(-ENOSYS);
172 }
173 static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
174 					struct device *dev,
175 					struct gpd_timing_data *td)
176 {
177 	return -ENOSYS;
178 }
179 static inline int __pm_genpd_name_add_device(const char *domain_name,
180 					     struct device *dev,
181 					     struct gpd_timing_data *td)
182 {
183 	return -ENOSYS;
184 }
185 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
186 					 struct device *dev)
187 {
188 	return -ENOSYS;
189 }
190 static inline void pm_genpd_dev_need_restore(struct device *dev, bool val) {}
191 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
192 					 struct generic_pm_domain *new_sd)
193 {
194 	return -ENOSYS;
195 }
196 static inline int pm_genpd_add_subdomain_names(const char *master_name,
197 					       const char *subdomain_name)
198 {
199 	return -ENOSYS;
200 }
201 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
202 					    struct generic_pm_domain *target)
203 {
204 	return -ENOSYS;
205 }
206 static inline int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int st)
207 {
208 	return -ENOSYS;
209 }
210 static inline int pm_genpd_name_attach_cpuidle(const char *name, int state)
211 {
212 	return -ENOSYS;
213 }
214 static inline int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd)
215 {
216 	return -ENOSYS;
217 }
218 static inline int pm_genpd_name_detach_cpuidle(const char *name)
219 {
220 	return -ENOSYS;
221 }
222 static inline void pm_genpd_init(struct generic_pm_domain *genpd,
223 				 struct dev_power_governor *gov, bool is_off)
224 {
225 }
226 static inline int pm_genpd_poweron(struct generic_pm_domain *genpd)
227 {
228 	return -ENOSYS;
229 }
230 static inline int pm_genpd_name_poweron(const char *domain_name)
231 {
232 	return -ENOSYS;
233 }
234 static inline void pm_genpd_poweroff_unused(void) {}
235 #define simple_qos_governor NULL
236 #define pm_domain_always_on_gov NULL
237 #endif
238 
239 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
240 				      struct device *dev)
241 {
242 	return __pm_genpd_add_device(genpd, dev, NULL);
243 }
244 
245 static inline int pm_genpd_name_add_device(const char *domain_name,
246 					   struct device *dev)
247 {
248 	return __pm_genpd_name_add_device(domain_name, dev, NULL);
249 }
250 
251 #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
252 extern void pm_genpd_syscore_poweroff(struct device *dev);
253 extern void pm_genpd_syscore_poweron(struct device *dev);
254 #else
255 static inline void pm_genpd_syscore_poweroff(struct device *dev) {}
256 static inline void pm_genpd_syscore_poweron(struct device *dev) {}
257 #endif
258 
259 /* OF PM domain providers */
260 struct of_device_id;
261 
262 struct genpd_onecell_data {
263 	struct generic_pm_domain **domains;
264 	unsigned int num_domains;
265 };
266 
267 typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args,
268 						void *data);
269 
270 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
271 int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
272 			void *data);
273 void of_genpd_del_provider(struct device_node *np);
274 
275 struct generic_pm_domain *__of_genpd_xlate_simple(
276 					struct of_phandle_args *genpdspec,
277 					void *data);
278 struct generic_pm_domain *__of_genpd_xlate_onecell(
279 					struct of_phandle_args *genpdspec,
280 					void *data);
281 
282 int genpd_dev_pm_attach(struct device *dev);
283 #else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
284 static inline int __of_genpd_add_provider(struct device_node *np,
285 					genpd_xlate_t xlate, void *data)
286 {
287 	return 0;
288 }
289 static inline void of_genpd_del_provider(struct device_node *np) {}
290 
291 #define __of_genpd_xlate_simple		NULL
292 #define __of_genpd_xlate_onecell	NULL
293 
294 static inline int genpd_dev_pm_attach(struct device *dev)
295 {
296 	return -ENODEV;
297 }
298 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
299 
300 static inline int of_genpd_add_provider_simple(struct device_node *np,
301 					struct generic_pm_domain *genpd)
302 {
303 	return __of_genpd_add_provider(np, __of_genpd_xlate_simple, genpd);
304 }
305 static inline int of_genpd_add_provider_onecell(struct device_node *np,
306 					struct genpd_onecell_data *data)
307 {
308 	return __of_genpd_add_provider(np, __of_genpd_xlate_onecell, data);
309 }
310 
311 #ifdef CONFIG_PM
312 extern int dev_pm_domain_attach(struct device *dev, bool power_on);
313 extern void dev_pm_domain_detach(struct device *dev, bool power_off);
314 #else
315 static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
316 {
317 	return -ENODEV;
318 }
319 static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
320 #endif
321 
322 #endif /* _LINUX_PM_DOMAIN_H */
323