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1 | /* |
2 | * pm_domain.h - Definitions and headers related to device power domains. |
3 | * |
4 | * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, 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 | enum gpd_status { |
21 | GPD_STATE_ACTIVE = 0, /* PM domain is active */ |
22 | GPD_STATE_WAIT_MASTER, /* PM domain's master is being waited for */ |
23 | GPD_STATE_BUSY, /* Something is happening to the PM domain */ |
24 | GPD_STATE_REPEAT, /* Power off in progress, to be repeated */ |
25 | GPD_STATE_POWER_OFF, /* PM domain is off */ |
26 | }; |
27 | |
28 | struct dev_power_governor { |
29 | bool (*power_down_ok)(struct dev_pm_domain *domain); |
30 | bool (*stop_ok)(struct device *dev); |
31 | }; |
32 | |
33 | struct gpd_dev_ops { |
34 | int (*start)(struct device *dev); |
35 | int (*stop)(struct device *dev); |
36 | int (*save_state)(struct device *dev); |
37 | int (*restore_state)(struct device *dev); |
38 | int (*suspend)(struct device *dev); |
39 | int (*suspend_late)(struct device *dev); |
40 | int (*resume_early)(struct device *dev); |
41 | int (*resume)(struct device *dev); |
42 | int (*freeze)(struct device *dev); |
43 | int (*freeze_late)(struct device *dev); |
44 | int (*thaw_early)(struct device *dev); |
45 | int (*thaw)(struct device *dev); |
46 | bool (*active_wakeup)(struct device *dev); |
47 | }; |
48 | |
49 | struct gpd_cpu_data { |
50 | unsigned int saved_exit_latency; |
51 | struct cpuidle_state *idle_state; |
52 | }; |
53 | |
54 | struct generic_pm_domain { |
55 | struct dev_pm_domain domain; /* PM domain operations */ |
56 | struct list_head gpd_list_node; /* Node in the global PM domains list */ |
57 | struct list_head master_links; /* Links with PM domain as a master */ |
58 | struct list_head slave_links; /* Links with PM domain as a slave */ |
59 | struct list_head dev_list; /* List of devices */ |
60 | struct mutex lock; |
61 | struct dev_power_governor *gov; |
62 | struct work_struct power_off_work; |
63 | char *name; |
64 | unsigned int in_progress; /* Number of devices being suspended now */ |
65 | atomic_t sd_count; /* Number of subdomains with power "on" */ |
66 | enum gpd_status status; /* Current state of the domain */ |
67 | wait_queue_head_t status_wait_queue; |
68 | struct task_struct *poweroff_task; /* Powering off task */ |
69 | unsigned int resume_count; /* Number of devices being resumed */ |
70 | unsigned int device_count; /* Number of devices */ |
71 | unsigned int suspended_count; /* System suspend device counter */ |
72 | unsigned int prepared_count; /* Suspend counter of prepared devices */ |
73 | bool suspend_power_off; /* Power status before system suspend */ |
74 | bool dev_irq_safe; /* Device callbacks are IRQ-safe */ |
75 | int (*power_off)(struct generic_pm_domain *domain); |
76 | s64 power_off_latency_ns; |
77 | int (*power_on)(struct generic_pm_domain *domain); |
78 | s64 power_on_latency_ns; |
79 | struct gpd_dev_ops dev_ops; |
80 | s64 max_off_time_ns; /* Maximum allowed "suspended" time. */ |
81 | bool max_off_time_changed; |
82 | bool cached_power_down_ok; |
83 | struct device_node *of_node; /* Node in device tree */ |
84 | struct gpd_cpu_data *cpu_data; |
85 | }; |
86 | |
87 | static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd) |
88 | { |
89 | return container_of(pd, struct generic_pm_domain, domain); |
90 | } |
91 | |
92 | struct gpd_link { |
93 | struct generic_pm_domain *master; |
94 | struct list_head master_node; |
95 | struct generic_pm_domain *slave; |
96 | struct list_head slave_node; |
97 | }; |
98 | |
99 | struct gpd_timing_data { |
100 | s64 stop_latency_ns; |
101 | s64 start_latency_ns; |
102 | s64 save_state_latency_ns; |
103 | s64 restore_state_latency_ns; |
104 | s64 effective_constraint_ns; |
105 | bool constraint_changed; |
106 | bool cached_stop_ok; |
107 | }; |
108 | |
109 | struct generic_pm_domain_data { |
110 | struct pm_domain_data base; |
111 | struct gpd_dev_ops ops; |
112 | struct gpd_timing_data td; |
113 | struct notifier_block nb; |
114 | struct mutex lock; |
115 | unsigned int refcount; |
116 | bool need_restore; |
117 | }; |
118 | |
119 | #ifdef CONFIG_PM_GENERIC_DOMAINS |
120 | static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd) |
121 | { |
122 | return container_of(pdd, struct generic_pm_domain_data, base); |
123 | } |
124 | |
125 | static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev) |
126 | { |
127 | return to_gpd_data(dev->power.subsys_data->domain_data); |
128 | } |
129 | |
130 | extern struct dev_power_governor simple_qos_governor; |
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_of_add_device(struct device_node *genpd_node, |
138 | struct device *dev, |
139 | struct gpd_timing_data *td); |
140 | |
141 | extern int __pm_genpd_name_add_device(const char *domain_name, |
142 | struct device *dev, |
143 | struct gpd_timing_data *td); |
144 | |
145 | extern int pm_genpd_remove_device(struct generic_pm_domain *genpd, |
146 | struct device *dev); |
147 | extern void pm_genpd_dev_need_restore(struct device *dev, bool val); |
148 | extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, |
149 | struct generic_pm_domain *new_subdomain); |
150 | extern int pm_genpd_add_subdomain_names(const char *master_name, |
151 | const char *subdomain_name); |
152 | extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, |
153 | struct generic_pm_domain *target); |
154 | extern int pm_genpd_add_callbacks(struct device *dev, |
155 | struct gpd_dev_ops *ops, |
156 | struct gpd_timing_data *td); |
157 | extern int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td); |
158 | extern int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state); |
159 | extern int pm_genpd_name_attach_cpuidle(const char *name, int state); |
160 | extern int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd); |
161 | extern int pm_genpd_name_detach_cpuidle(const char *name); |
162 | extern void pm_genpd_init(struct generic_pm_domain *genpd, |
163 | struct dev_power_governor *gov, bool is_off); |
164 | |
165 | extern int pm_genpd_poweron(struct generic_pm_domain *genpd); |
166 | extern int pm_genpd_name_poweron(const char *domain_name); |
167 | |
168 | extern bool default_stop_ok(struct device *dev); |
169 | |
170 | extern struct dev_power_governor pm_domain_always_on_gov; |
171 | #else |
172 | |
173 | static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev) |
174 | { |
175 | return ERR_PTR(-ENOSYS); |
176 | } |
177 | static inline struct generic_pm_domain *dev_to_genpd(struct device *dev) |
178 | { |
179 | return ERR_PTR(-ENOSYS); |
180 | } |
181 | static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd, |
182 | struct device *dev, |
183 | struct gpd_timing_data *td) |
184 | { |
185 | return -ENOSYS; |
186 | } |
187 | static inline int __pm_genpd_of_add_device(struct device_node *genpd_node, |
188 | struct device *dev, |
189 | struct gpd_timing_data *td) |
190 | { |
191 | return -ENOSYS; |
192 | } |
193 | static inline int __pm_genpd_name_add_device(const char *domain_name, |
194 | struct device *dev, |
195 | struct gpd_timing_data *td) |
196 | { |
197 | return -ENOSYS; |
198 | } |
199 | static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd, |
200 | struct device *dev) |
201 | { |
202 | return -ENOSYS; |
203 | } |
204 | static inline void pm_genpd_dev_need_restore(struct device *dev, bool val) {} |
205 | static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, |
206 | struct generic_pm_domain *new_sd) |
207 | { |
208 | return -ENOSYS; |
209 | } |
210 | static inline int pm_genpd_add_subdomain_names(const char *master_name, |
211 | const char *subdomain_name) |
212 | { |
213 | return -ENOSYS; |
214 | } |
215 | static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, |
216 | struct generic_pm_domain *target) |
217 | { |
218 | return -ENOSYS; |
219 | } |
220 | static inline int pm_genpd_add_callbacks(struct device *dev, |
221 | struct gpd_dev_ops *ops, |
222 | struct gpd_timing_data *td) |
223 | { |
224 | return -ENOSYS; |
225 | } |
226 | static inline int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td) |
227 | { |
228 | return -ENOSYS; |
229 | } |
230 | static inline int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int st) |
231 | { |
232 | return -ENOSYS; |
233 | } |
234 | static inline int pm_genpd_name_attach_cpuidle(const char *name, int state) |
235 | { |
236 | return -ENOSYS; |
237 | } |
238 | static inline int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd) |
239 | { |
240 | return -ENOSYS; |
241 | } |
242 | static inline int pm_genpd_name_detach_cpuidle(const char *name) |
243 | { |
244 | return -ENOSYS; |
245 | } |
246 | static inline void pm_genpd_init(struct generic_pm_domain *genpd, |
247 | struct dev_power_governor *gov, bool is_off) |
248 | { |
249 | } |
250 | static inline int pm_genpd_poweron(struct generic_pm_domain *genpd) |
251 | { |
252 | return -ENOSYS; |
253 | } |
254 | static inline int pm_genpd_name_poweron(const char *domain_name) |
255 | { |
256 | return -ENOSYS; |
257 | } |
258 | static inline bool default_stop_ok(struct device *dev) |
259 | { |
260 | return false; |
261 | } |
262 | #define simple_qos_governor NULL |
263 | #define pm_domain_always_on_gov NULL |
264 | #endif |
265 | |
266 | static inline int pm_genpd_add_device(struct generic_pm_domain *genpd, |
267 | struct device *dev) |
268 | { |
269 | return __pm_genpd_add_device(genpd, dev, NULL); |
270 | } |
271 | |
272 | static inline int pm_genpd_of_add_device(struct device_node *genpd_node, |
273 | struct device *dev) |
274 | { |
275 | return __pm_genpd_of_add_device(genpd_node, dev, NULL); |
276 | } |
277 | |
278 | static inline int pm_genpd_name_add_device(const char *domain_name, |
279 | struct device *dev) |
280 | { |
281 | return __pm_genpd_name_add_device(domain_name, dev, NULL); |
282 | } |
283 | |
284 | static inline int pm_genpd_remove_callbacks(struct device *dev) |
285 | { |
286 | return __pm_genpd_remove_callbacks(dev, true); |
287 | } |
288 | |
289 | #ifdef CONFIG_PM_GENERIC_DOMAINS_RUNTIME |
290 | extern void genpd_queue_power_off_work(struct generic_pm_domain *genpd); |
291 | extern void pm_genpd_poweroff_unused(void); |
292 | #else |
293 | static inline void genpd_queue_power_off_work(struct generic_pm_domain *gpd) {} |
294 | static inline void pm_genpd_poweroff_unused(void) {} |
295 | #endif |
296 | |
297 | #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP |
298 | extern void pm_genpd_syscore_switch(struct device *dev, bool suspend); |
299 | #else |
300 | static inline void pm_genpd_syscore_switch(struct device *dev, bool suspend) {} |
301 | #endif |
302 | |
303 | static inline void pm_genpd_syscore_poweroff(struct device *dev) |
304 | { |
305 | pm_genpd_syscore_switch(dev, true); |
306 | } |
307 | |
308 | static inline void pm_genpd_syscore_poweron(struct device *dev) |
309 | { |
310 | pm_genpd_syscore_switch(dev, false); |
311 | } |
312 | |
313 | #endif /* _LINUX_PM_DOMAIN_H */ |
314 |
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