ba7ca5468a7b3e795038e0e85538a00e967fcf7b
[cascardo/linux.git] / include / linux / pm_domain.h
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 /* 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
160 extern struct dev_power_governor simple_qos_governor;
161 extern struct dev_power_governor pm_domain_always_on_gov;
162 #else
163
164 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
165 {
166         return ERR_PTR(-ENOSYS);
167 }
168 static inline struct generic_pm_domain *dev_to_genpd(struct device *dev)
169 {
170         return ERR_PTR(-ENOSYS);
171 }
172 static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
173                                         struct device *dev,
174                                         struct gpd_timing_data *td)
175 {
176         return -ENOSYS;
177 }
178 static inline int __pm_genpd_name_add_device(const char *domain_name,
179                                              struct device *dev,
180                                              struct gpd_timing_data *td)
181 {
182         return -ENOSYS;
183 }
184 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
185                                          struct device *dev)
186 {
187         return -ENOSYS;
188 }
189 static inline void pm_genpd_dev_need_restore(struct device *dev, bool val) {}
190 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
191                                          struct generic_pm_domain *new_sd)
192 {
193         return -ENOSYS;
194 }
195 static inline int pm_genpd_add_subdomain_names(const char *master_name,
196                                                const char *subdomain_name)
197 {
198         return -ENOSYS;
199 }
200 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
201                                             struct generic_pm_domain *target)
202 {
203         return -ENOSYS;
204 }
205 static inline int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int st)
206 {
207         return -ENOSYS;
208 }
209 static inline int pm_genpd_name_attach_cpuidle(const char *name, int state)
210 {
211         return -ENOSYS;
212 }
213 static inline int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd)
214 {
215         return -ENOSYS;
216 }
217 static inline int pm_genpd_name_detach_cpuidle(const char *name)
218 {
219         return -ENOSYS;
220 }
221 static inline void pm_genpd_init(struct generic_pm_domain *genpd,
222                                  struct dev_power_governor *gov, bool is_off)
223 {
224 }
225 static inline int pm_genpd_poweron(struct generic_pm_domain *genpd)
226 {
227         return -ENOSYS;
228 }
229 static inline int pm_genpd_name_poweron(const char *domain_name)
230 {
231         return -ENOSYS;
232 }
233 #define simple_qos_governor NULL
234 #define pm_domain_always_on_gov NULL
235 #endif
236
237 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
238                                       struct device *dev)
239 {
240         return __pm_genpd_add_device(genpd, dev, NULL);
241 }
242
243 static inline int pm_genpd_name_add_device(const char *domain_name,
244                                            struct device *dev)
245 {
246         return __pm_genpd_name_add_device(domain_name, dev, NULL);
247 }
248
249 #ifdef CONFIG_PM_GENERIC_DOMAINS_RUNTIME
250 extern void pm_genpd_poweroff_unused(void);
251 #else
252 static inline void pm_genpd_poweroff_unused(void) {}
253 #endif
254
255 #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
256 extern void pm_genpd_syscore_poweroff(struct device *dev);
257 extern void pm_genpd_syscore_poweron(struct device *dev);
258 #else
259 static inline void pm_genpd_syscore_poweroff(struct device *dev) {}
260 static inline void pm_genpd_syscore_poweron(struct device *dev) {}
261 #endif
262
263 /* OF PM domain providers */
264 struct of_device_id;
265
266 struct genpd_onecell_data {
267         struct generic_pm_domain **domains;
268         unsigned int num_domains;
269 };
270
271 typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args,
272                                                 void *data);
273
274 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
275 int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
276                         void *data);
277 void of_genpd_del_provider(struct device_node *np);
278 struct generic_pm_domain *of_genpd_get_from_provider(
279                         struct of_phandle_args *genpdspec);
280
281 struct generic_pm_domain *__of_genpd_xlate_simple(
282                                         struct of_phandle_args *genpdspec,
283                                         void *data);
284 struct generic_pm_domain *__of_genpd_xlate_onecell(
285                                         struct of_phandle_args *genpdspec,
286                                         void *data);
287
288 int genpd_dev_pm_attach(struct device *dev);
289 #else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
290 static inline int __of_genpd_add_provider(struct device_node *np,
291                                         genpd_xlate_t xlate, void *data)
292 {
293         return 0;
294 }
295 static inline void of_genpd_del_provider(struct device_node *np) {}
296
297 static inline struct generic_pm_domain *of_genpd_get_from_provider(
298                         struct of_phandle_args *genpdspec)
299 {
300         return NULL;
301 }
302
303 #define __of_genpd_xlate_simple         NULL
304 #define __of_genpd_xlate_onecell        NULL
305
306 static inline int genpd_dev_pm_attach(struct device *dev)
307 {
308         return -ENODEV;
309 }
310 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
311
312 static inline int of_genpd_add_provider_simple(struct device_node *np,
313                                         struct generic_pm_domain *genpd)
314 {
315         return __of_genpd_add_provider(np, __of_genpd_xlate_simple, genpd);
316 }
317 static inline int of_genpd_add_provider_onecell(struct device_node *np,
318                                         struct genpd_onecell_data *data)
319 {
320         return __of_genpd_add_provider(np, __of_genpd_xlate_onecell, data);
321 }
322
323 #ifdef CONFIG_PM
324 extern int dev_pm_domain_attach(struct device *dev, bool power_on);
325 extern void dev_pm_domain_detach(struct device *dev, bool power_off);
326 #else
327 static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
328 {
329         return -ENODEV;
330 }
331 static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
332 #endif
333
334 #endif /* _LINUX_PM_DOMAIN_H */