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 */