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