xref: /linux-6.15/include/linux/pm_domain.h (revision abb06b99)
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 
24 enum gpd_status {
25 	GPD_STATE_ACTIVE = 0,	/* PM domain is active */
26 	GPD_STATE_POWER_OFF,	/* PM domain is off */
27 };
28 
29 struct dev_power_governor {
30 	bool (*power_down_ok)(struct dev_pm_domain *domain);
31 	bool (*suspend_ok)(struct device *dev);
32 };
33 
34 struct gpd_dev_ops {
35 	int (*start)(struct device *dev);
36 	int (*stop)(struct device *dev);
37 	bool (*active_wakeup)(struct device *dev);
38 };
39 
40 struct genpd_power_state {
41 	s64 power_off_latency_ns;
42 	s64 power_on_latency_ns;
43 	s64 residency_ns;
44 	struct fwnode_handle *fwnode;
45 };
46 
47 struct genpd_lock_ops;
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 dev_power_governor *gov;
56 	struct work_struct power_off_work;
57 	struct fwnode_handle *provider;	/* Identity of the domain provider */
58 	bool has_provider;
59 	const char *name;
60 	atomic_t sd_count;	/* Number of subdomains with power "on" */
61 	enum gpd_status status;	/* Current state of the domain */
62 	unsigned int device_count;	/* Number of devices */
63 	unsigned int suspended_count;	/* System suspend device counter */
64 	unsigned int prepared_count;	/* Suspend counter of prepared devices */
65 	int (*power_off)(struct generic_pm_domain *domain);
66 	int (*power_on)(struct generic_pm_domain *domain);
67 	struct gpd_dev_ops dev_ops;
68 	s64 max_off_time_ns;	/* Maximum allowed "suspended" time. */
69 	bool max_off_time_changed;
70 	bool cached_power_down_ok;
71 	int (*attach_dev)(struct generic_pm_domain *domain,
72 			  struct device *dev);
73 	void (*detach_dev)(struct generic_pm_domain *domain,
74 			   struct device *dev);
75 	unsigned int flags;		/* Bit field of configs for genpd */
76 	struct genpd_power_state *states;
77 	unsigned int state_count; /* number of states */
78 	unsigned int state_idx; /* state that genpd will go to when off */
79 	void *free; /* Free the state that was allocated for default */
80 	const struct genpd_lock_ops *lock_ops;
81 	union {
82 		struct mutex mlock;
83 		struct {
84 			spinlock_t slock;
85 			unsigned long lock_flags;
86 		};
87 	};
88 
89 };
90 
91 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
92 {
93 	return container_of(pd, struct generic_pm_domain, domain);
94 }
95 
96 struct gpd_link {
97 	struct generic_pm_domain *master;
98 	struct list_head master_node;
99 	struct generic_pm_domain *slave;
100 	struct list_head slave_node;
101 };
102 
103 struct gpd_timing_data {
104 	s64 suspend_latency_ns;
105 	s64 resume_latency_ns;
106 	s64 effective_constraint_ns;
107 	bool constraint_changed;
108 	bool cached_suspend_ok;
109 };
110 
111 struct pm_domain_data {
112 	struct list_head list_node;
113 	struct device *dev;
114 };
115 
116 struct generic_pm_domain_data {
117 	struct pm_domain_data base;
118 	struct gpd_timing_data td;
119 	struct notifier_block nb;
120 };
121 
122 #ifdef CONFIG_PM_GENERIC_DOMAINS
123 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
124 {
125 	return container_of(pdd, struct generic_pm_domain_data, base);
126 }
127 
128 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
129 {
130 	return to_gpd_data(dev->power.subsys_data->domain_data);
131 }
132 
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_remove_device(struct generic_pm_domain *genpd,
138 				  struct device *dev);
139 extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
140 				  struct generic_pm_domain *new_subdomain);
141 extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
142 				     struct generic_pm_domain *target);
143 extern int pm_genpd_init(struct generic_pm_domain *genpd,
144 			 struct dev_power_governor *gov, bool is_off);
145 extern int pm_genpd_remove(struct generic_pm_domain *genpd);
146 
147 extern struct dev_power_governor simple_qos_governor;
148 extern struct dev_power_governor pm_domain_always_on_gov;
149 #else
150 
151 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
152 {
153 	return ERR_PTR(-ENOSYS);
154 }
155 static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
156 					struct device *dev,
157 					struct gpd_timing_data *td)
158 {
159 	return -ENOSYS;
160 }
161 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
162 					 struct device *dev)
163 {
164 	return -ENOSYS;
165 }
166 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
167 					 struct generic_pm_domain *new_sd)
168 {
169 	return -ENOSYS;
170 }
171 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
172 					    struct generic_pm_domain *target)
173 {
174 	return -ENOSYS;
175 }
176 static inline int pm_genpd_init(struct generic_pm_domain *genpd,
177 				struct dev_power_governor *gov, bool is_off)
178 {
179 	return -ENOSYS;
180 }
181 static inline int pm_genpd_remove(struct generic_pm_domain *genpd)
182 {
183 	return -ENOTSUPP;
184 }
185 
186 #define simple_qos_governor		(*(struct dev_power_governor *)(NULL))
187 #define pm_domain_always_on_gov		(*(struct dev_power_governor *)(NULL))
188 #endif
189 
190 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
191 				      struct device *dev)
192 {
193 	return __pm_genpd_add_device(genpd, dev, NULL);
194 }
195 
196 #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
197 extern void pm_genpd_syscore_poweroff(struct device *dev);
198 extern void pm_genpd_syscore_poweron(struct device *dev);
199 #else
200 static inline void pm_genpd_syscore_poweroff(struct device *dev) {}
201 static inline void pm_genpd_syscore_poweron(struct device *dev) {}
202 #endif
203 
204 /* OF PM domain providers */
205 struct of_device_id;
206 
207 struct genpd_onecell_data {
208 	struct generic_pm_domain **domains;
209 	unsigned int num_domains;
210 };
211 
212 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
213 int of_genpd_add_provider_simple(struct device_node *np,
214 				 struct generic_pm_domain *genpd);
215 int of_genpd_add_provider_onecell(struct device_node *np,
216 				  struct genpd_onecell_data *data);
217 void of_genpd_del_provider(struct device_node *np);
218 extern int of_genpd_add_device(struct of_phandle_args *args,
219 			       struct device *dev);
220 extern int of_genpd_add_subdomain(struct of_phandle_args *parent,
221 				  struct of_phandle_args *new_subdomain);
222 extern struct generic_pm_domain *of_genpd_remove_last(struct device_node *np);
223 extern int of_genpd_parse_idle_states(struct device_node *dn,
224 			struct genpd_power_state **states, int *n);
225 
226 int genpd_dev_pm_attach(struct device *dev);
227 #else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
228 static inline int of_genpd_add_provider_simple(struct device_node *np,
229 					struct generic_pm_domain *genpd)
230 {
231 	return -ENOTSUPP;
232 }
233 
234 static inline int of_genpd_add_provider_onecell(struct device_node *np,
235 					struct genpd_onecell_data *data)
236 {
237 	return -ENOTSUPP;
238 }
239 
240 static inline void of_genpd_del_provider(struct device_node *np) {}
241 
242 static inline int of_genpd_add_device(struct of_phandle_args *args,
243 				      struct device *dev)
244 {
245 	return -ENODEV;
246 }
247 
248 static inline int of_genpd_add_subdomain(struct of_phandle_args *parent,
249 					 struct of_phandle_args *new_subdomain)
250 {
251 	return -ENODEV;
252 }
253 
254 static inline int of_genpd_parse_idle_states(struct device_node *dn,
255 			struct genpd_power_state **states, int *n)
256 {
257 	return -ENODEV;
258 }
259 
260 static inline int genpd_dev_pm_attach(struct device *dev)
261 {
262 	return -ENODEV;
263 }
264 
265 static inline
266 struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
267 {
268 	return ERR_PTR(-ENOTSUPP);
269 }
270 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
271 
272 #ifdef CONFIG_PM
273 extern int dev_pm_domain_attach(struct device *dev, bool power_on);
274 extern void dev_pm_domain_detach(struct device *dev, bool power_off);
275 extern void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);
276 #else
277 static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
278 {
279 	return -ENODEV;
280 }
281 static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
282 static inline void dev_pm_domain_set(struct device *dev,
283 				     struct dev_pm_domain *pd) {}
284 #endif
285 
286 #endif /* _LINUX_PM_DOMAIN_H */
287