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 */