Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
[platform/adaptation/renesas_rcar/renesas_kernel.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 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 */