Merge branch 'acpi-ec'
[linux-drm-fsl-dcu.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         int 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 generic_pm_domain *dev_to_genpd(struct device *dev);
131 extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
132                                  struct device *dev,
133                                  struct gpd_timing_data *td);
134
135 extern int __pm_genpd_name_add_device(const char *domain_name,
136                                       struct device *dev,
137                                       struct gpd_timing_data *td);
138
139 extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
140                                   struct device *dev);
141 extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
142                                   struct generic_pm_domain *new_subdomain);
143 extern int pm_genpd_add_subdomain_names(const char *master_name,
144                                         const char *subdomain_name);
145 extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
146                                      struct generic_pm_domain *target);
147 extern int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state);
148 extern int pm_genpd_name_attach_cpuidle(const char *name, int state);
149 extern int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd);
150 extern int pm_genpd_name_detach_cpuidle(const char *name);
151 extern void pm_genpd_init(struct generic_pm_domain *genpd,
152                           struct dev_power_governor *gov, bool is_off);
153
154 extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
155 extern int pm_genpd_name_poweron(const char *domain_name);
156 extern void pm_genpd_poweroff_unused(void);
157
158 extern struct dev_power_governor simple_qos_governor;
159 extern struct dev_power_governor pm_domain_always_on_gov;
160 #else
161
162 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
163 {
164         return ERR_PTR(-ENOSYS);
165 }
166 static inline struct generic_pm_domain *dev_to_genpd(struct device *dev)
167 {
168         return ERR_PTR(-ENOSYS);
169 }
170 static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
171                                         struct device *dev,
172                                         struct gpd_timing_data *td)
173 {
174         return -ENOSYS;
175 }
176 static inline int __pm_genpd_name_add_device(const char *domain_name,
177                                              struct device *dev,
178                                              struct gpd_timing_data *td)
179 {
180         return -ENOSYS;
181 }
182 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
183                                          struct device *dev)
184 {
185         return -ENOSYS;
186 }
187 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
188                                          struct generic_pm_domain *new_sd)
189 {
190         return -ENOSYS;
191 }
192 static inline int pm_genpd_add_subdomain_names(const char *master_name,
193                                                const char *subdomain_name)
194 {
195         return -ENOSYS;
196 }
197 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
198                                             struct generic_pm_domain *target)
199 {
200         return -ENOSYS;
201 }
202 static inline int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int st)
203 {
204         return -ENOSYS;
205 }
206 static inline int pm_genpd_name_attach_cpuidle(const char *name, int state)
207 {
208         return -ENOSYS;
209 }
210 static inline int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd)
211 {
212         return -ENOSYS;
213 }
214 static inline int pm_genpd_name_detach_cpuidle(const char *name)
215 {
216         return -ENOSYS;
217 }
218 static inline void pm_genpd_init(struct generic_pm_domain *genpd,
219                                  struct dev_power_governor *gov, bool is_off)
220 {
221 }
222 static inline int pm_genpd_poweron(struct generic_pm_domain *genpd)
223 {
224         return -ENOSYS;
225 }
226 static inline int pm_genpd_name_poweron(const char *domain_name)
227 {
228         return -ENOSYS;
229 }
230 static inline void pm_genpd_poweroff_unused(void) {}
231 #define simple_qos_governor NULL
232 #define pm_domain_always_on_gov NULL
233 #endif
234
235 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
236                                       struct device *dev)
237 {
238         return __pm_genpd_add_device(genpd, dev, NULL);
239 }
240
241 static inline int pm_genpd_name_add_device(const char *domain_name,
242                                            struct device *dev)
243 {
244         return __pm_genpd_name_add_device(domain_name, dev, NULL);
245 }
246
247 #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
248 extern void pm_genpd_syscore_poweroff(struct device *dev);
249 extern void pm_genpd_syscore_poweron(struct device *dev);
250 #else
251 static inline void pm_genpd_syscore_poweroff(struct device *dev) {}
252 static inline void pm_genpd_syscore_poweron(struct device *dev) {}
253 #endif
254
255 /* OF PM domain providers */
256 struct of_device_id;
257
258 struct genpd_onecell_data {
259         struct generic_pm_domain **domains;
260         unsigned int num_domains;
261 };
262
263 typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args,
264                                                 void *data);
265
266 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
267 int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
268                         void *data);
269 void of_genpd_del_provider(struct device_node *np);
270 struct generic_pm_domain *of_genpd_get_from_provider(
271                         struct of_phandle_args *genpdspec);
272
273 struct generic_pm_domain *__of_genpd_xlate_simple(
274                                         struct of_phandle_args *genpdspec,
275                                         void *data);
276 struct generic_pm_domain *__of_genpd_xlate_onecell(
277                                         struct of_phandle_args *genpdspec,
278                                         void *data);
279
280 int genpd_dev_pm_attach(struct device *dev);
281 #else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
282 static inline int __of_genpd_add_provider(struct device_node *np,
283                                         genpd_xlate_t xlate, void *data)
284 {
285         return 0;
286 }
287 static inline void of_genpd_del_provider(struct device_node *np) {}
288
289 static inline struct generic_pm_domain *of_genpd_get_from_provider(
290                         struct of_phandle_args *genpdspec)
291 {
292         return NULL;
293 }
294
295 #define __of_genpd_xlate_simple         NULL
296 #define __of_genpd_xlate_onecell        NULL
297
298 static inline int genpd_dev_pm_attach(struct device *dev)
299 {
300         return -ENODEV;
301 }
302 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
303
304 static inline int of_genpd_add_provider_simple(struct device_node *np,
305                                         struct generic_pm_domain *genpd)
306 {
307         return __of_genpd_add_provider(np, __of_genpd_xlate_simple, genpd);
308 }
309 static inline int of_genpd_add_provider_onecell(struct device_node *np,
310                                         struct genpd_onecell_data *data)
311 {
312         return __of_genpd_add_provider(np, __of_genpd_xlate_onecell, data);
313 }
314
315 #ifdef CONFIG_PM
316 extern int dev_pm_domain_attach(struct device *dev, bool power_on);
317 extern void dev_pm_domain_detach(struct device *dev, bool power_off);
318 #else
319 static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
320 {
321         return -ENODEV;
322 }
323 static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
324 #endif
325
326 #endif /* _LINUX_PM_DOMAIN_H */