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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
20enum 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
28struct dev_power_governor {
29 bool (*power_down_ok)(struct dev_pm_domain *domain);
30 bool (*stop_ok)(struct device *dev);
31};
32
33struct 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
41struct gpd_cpuidle_data {
42 unsigned int saved_exit_latency;
43 struct cpuidle_state *idle_state;
44};
45
46struct 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 wait_queue_head_t status_wait_queue;
60 struct task_struct *poweroff_task; /* Powering off task */
61 unsigned int resume_count; /* Number of devices being resumed */
62 unsigned int device_count; /* Number of devices */
63 unsigned int suspended_count; /* System suspend device counter */
64 unsigned int prepared_count; /* Suspend counter of prepared devices */
65 bool suspend_power_off; /* Power status before system suspend */
66 int (*power_off)(struct generic_pm_domain *domain);
67 s64 power_off_latency_ns;
68 int (*power_on)(struct generic_pm_domain *domain);
69 s64 power_on_latency_ns;
70 struct gpd_dev_ops dev_ops;
71 s64 max_off_time_ns; /* Maximum allowed "suspended" time. */
72 bool max_off_time_changed;
73 bool cached_power_down_ok;
74 struct gpd_cpuidle_data *cpuidle_data;
75 int (*attach_dev)(struct generic_pm_domain *domain,
76 struct device *dev);
77 void (*detach_dev)(struct generic_pm_domain *domain,
78 struct device *dev);
79};
80
81static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
82{
83 return container_of(pd, struct generic_pm_domain, domain);
84}
85
86struct gpd_link {
87 struct generic_pm_domain *master;
88 struct list_head master_node;
89 struct generic_pm_domain *slave;
90 struct list_head slave_node;
91};
92
93struct gpd_timing_data {
94 s64 stop_latency_ns;
95 s64 start_latency_ns;
96 s64 save_state_latency_ns;
97 s64 restore_state_latency_ns;
98 s64 effective_constraint_ns;
99 bool constraint_changed;
100 bool cached_stop_ok;
101};
102
103struct generic_pm_domain_data {
104 struct pm_domain_data base;
105 struct gpd_timing_data td;
106 struct notifier_block nb;
107 struct mutex lock;
108 unsigned int refcount;
109 int need_restore;
110};
111
112#ifdef CONFIG_PM_GENERIC_DOMAINS
113static 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
118static 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
123extern struct generic_pm_domain *dev_to_genpd(struct device *dev);
124extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
125 struct device *dev,
126 struct gpd_timing_data *td);
127
128extern int __pm_genpd_name_add_device(const char *domain_name,
129 struct device *dev,
130 struct gpd_timing_data *td);
131
132extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
133 struct device *dev);
134extern void pm_genpd_dev_need_restore(struct device *dev, bool val);
135extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
136 struct generic_pm_domain *new_subdomain);
137extern int pm_genpd_add_subdomain_names(const char *master_name,
138 const char *subdomain_name);
139extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
140 struct generic_pm_domain *target);
141extern int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state);
142extern int pm_genpd_name_attach_cpuidle(const char *name, int state);
143extern int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd);
144extern int pm_genpd_name_detach_cpuidle(const char *name);
145extern void pm_genpd_init(struct generic_pm_domain *genpd,
146 struct dev_power_governor *gov, bool is_off);
147
148extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
149extern int pm_genpd_name_poweron(const char *domain_name);
150
151extern struct dev_power_governor simple_qos_governor;
152extern struct dev_power_governor pm_domain_always_on_gov;
153#else
154
155static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
156{
157 return ERR_PTR(-ENOSYS);
158}
159static inline struct generic_pm_domain *dev_to_genpd(struct device *dev)
160{
161 return ERR_PTR(-ENOSYS);
162}
163static 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}
169static 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}
175static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
176 struct device *dev)
177{
178 return -ENOSYS;
179}
180static inline void pm_genpd_dev_need_restore(struct device *dev, bool val) {}
181static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
182 struct generic_pm_domain *new_sd)
183{
184 return -ENOSYS;
185}
186static inline int pm_genpd_add_subdomain_names(const char *master_name,
187 const char *subdomain_name)
188{
189 return -ENOSYS;
190}
191static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
192 struct generic_pm_domain *target)
193{
194 return -ENOSYS;
195}
196static inline int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int st)
197{
198 return -ENOSYS;
199}
200static inline int pm_genpd_name_attach_cpuidle(const char *name, int state)
201{
202 return -ENOSYS;
203}
204static inline int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd)
205{
206 return -ENOSYS;
207}
208static inline int pm_genpd_name_detach_cpuidle(const char *name)
209{
210 return -ENOSYS;
211}
212static inline void pm_genpd_init(struct generic_pm_domain *genpd,
213 struct dev_power_governor *gov, bool is_off)
214{
215}
216static inline int pm_genpd_poweron(struct generic_pm_domain *genpd)
217{
218 return -ENOSYS;
219}
220static inline int pm_genpd_name_poweron(const char *domain_name)
221{
222 return -ENOSYS;
223}
224#define simple_qos_governor NULL
225#define pm_domain_always_on_gov NULL
226#endif
227
228static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
229 struct device *dev)
230{
231 return __pm_genpd_add_device(genpd, dev, NULL);
232}
233
234static inline int pm_genpd_name_add_device(const char *domain_name,
235 struct device *dev)
236{
237 return __pm_genpd_name_add_device(domain_name, dev, NULL);
238}
239
240#ifdef CONFIG_PM_GENERIC_DOMAINS_RUNTIME
241extern void pm_genpd_poweroff_unused(void);
242#else
243static inline void pm_genpd_poweroff_unused(void) {}
244#endif
245
246#ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
247extern void pm_genpd_syscore_poweroff(struct device *dev);
248extern void pm_genpd_syscore_poweron(struct device *dev);
249#else
250static inline void pm_genpd_syscore_poweroff(struct device *dev) {}
251static inline void pm_genpd_syscore_poweron(struct device *dev) {}
252#endif
253
254/* OF PM domain providers */
255struct of_device_id;
256
257struct genpd_onecell_data {
258 struct generic_pm_domain **domains;
259 unsigned int num_domains;
260};
261
262typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args,
263 void *data);
264
265#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
266int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
267 void *data);
268void of_genpd_del_provider(struct device_node *np);
269
270struct generic_pm_domain *__of_genpd_xlate_simple(
271 struct of_phandle_args *genpdspec,
272 void *data);
273struct generic_pm_domain *__of_genpd_xlate_onecell(
274 struct of_phandle_args *genpdspec,
275 void *data);
276
277int genpd_dev_pm_attach(struct device *dev);
278#else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
279static inline int __of_genpd_add_provider(struct device_node *np,
280 genpd_xlate_t xlate, void *data)
281{
282 return 0;
283}
284static inline void of_genpd_del_provider(struct device_node *np) {}
285
286#define __of_genpd_xlate_simple NULL
287#define __of_genpd_xlate_onecell NULL
288
289static inline int genpd_dev_pm_attach(struct device *dev)
290{
291 return -ENODEV;
292}
293#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
294
295static 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}
300static 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
307extern int dev_pm_domain_attach(struct device *dev, bool power_on);
308extern void dev_pm_domain_detach(struct device *dev, bool power_off);
309#else
310static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
311{
312 return -ENODEV;
313}
314static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
315#endif
316
317#endif /* _LINUX_PM_DOMAIN_H */