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/spinlock.h>
  19
  20 /*
  21  * Flags to control the behaviour of a genpd.
  22  *
  23  * These flags may be set in the struct generic_pm_domain's flags field by a
  24  * genpd backend driver. The flags must be set before it calls pm_genpd_init(),
  25  * which initializes a genpd.
  26  *
  27  * GENPD_FLAG_PM_CLK:           Instructs genpd to use the PM clk framework,
  28  *                              while powering on/off attached devices.
  29  *
  30  * GENPD_FLAG_IRQ_SAFE:         This informs genpd that its backend callbacks,
  31  *                              ->power_on|off(), doesn't sleep. Hence, these
  32  *                              can be invoked from within atomic context, which
  33  *                              enables genpd to power on/off the PM domain,
  34  *                              even when pm_runtime_is_irq_safe() returns true,
  35  *                              for any of its attached devices. Note that, a
  36  *                              genpd having this flag set, requires its
  37  *                              masterdomains to also have it set.
  38  *
  39  * GENPD_FLAG_ALWAYS_ON:        Instructs genpd to always keep the PM domain
  40  *                              powered on.
  41  *
  42  * GENPD_FLAG_ACTIVE_WAKEUP:    Instructs genpd to keep the PM domain powered
  43  *                              on, in case any of its attached devices is used
  44  *                              in the wakeup path to serve system wakeups.
  45  */
  46 #define GENPD_FLAG_PM_CLK        (1U << 0)
  47 #define GENPD_FLAG_IRQ_SAFE      (1U << 1)
  48 #define GENPD_FLAG_ALWAYS_ON     (1U << 2)
  49 #define GENPD_FLAG_ACTIVE_WAKEUP (1U << 3)
  50
  51 enum gpd_status {
  52         GPD_STATE_ACTIVE = 0,   /* PM domain is active */
  53         GPD_STATE_POWER_OFF,    /* PM domain is off */
  54 };
  55
  56 struct dev_power_governor {
  57         bool (*power_down_ok)(struct dev_pm_domain *domain);
  58         bool (*suspend_ok)(struct device *dev);
  59 };
  60
  61 struct gpd_dev_ops {
  62         int (*start)(struct device *dev);
  63         int (*stop)(struct device *dev);
  64 };
  65
  66 struct genpd_power_state {
  67         s64 power_off_latency_ns;
  68         s64 power_on_latency_ns;
  69         s64 residency_ns;
  70         struct fwnode_handle *fwnode;
  71         ktime_t idle_time;
  72 };
  73
  74 struct genpd_lock_ops;
  75 struct dev_pm_opp;
  76
  77 struct generic_pm_domain {
  78         struct device dev;
  79         struct dev_pm_domain domain;    /* PM domain operations */
  80         struct list_head gpd_list_node; /* Node in the global PM domains list */
  81         struct list_head master_links;  /* Links with PM domain as a master */
  82         struct list_head slave_links;   /* Links with PM domain as a slave */
  83         struct list_head dev_list;      /* List of devices */
  84         struct dev_power_governor *gov;
  85         struct work_struct power_off_work;
  86         struct fwnode_handle *provider; /* Identity of the domain provider */
  87         bool has_provider;
  88         const char *name;
  89         atomic_t sd_count;      /* Number of subdomains with power "on" */
  90         enum gpd_status status; /* Current state of the domain */
  91         unsigned int device_count;      /* Number of devices */
  92         unsigned int suspended_count;   /* System suspend device counter */
  93         unsigned int prepared_count;    /* Suspend counter of prepared devices */
  94         unsigned int performance_state; /* Aggregated max performance state */
  95         int (*power_off)(struct generic_pm_domain *domain);
  96         int (*power_on)(struct generic_pm_domain *domain);
  97         unsigned int (*opp_to_performance_state)(struct generic_pm_domain *genpd,
  98                                                  struct dev_pm_opp *opp);
  99         int (*set_performance_state)(struct generic_pm_domain *genpd,
 100                                      unsigned int state);
 101         struct gpd_dev_ops dev_ops;
 102         s64 max_off_time_ns;    /* Maximum allowed "suspended" time. */
 103         bool max_off_time_changed;
 104         bool cached_power_down_ok;
 105         int (*attach_dev)(struct generic_pm_domain *domain,
 106                           struct device *dev);
 107         void (*detach_dev)(struct generic_pm_domain *domain,
 108                            struct device *dev);
 109         unsigned int flags;             /* Bit field of configs for genpd */
 110         struct genpd_power_state *states;
 111         unsigned int state_count; /* number of states */
 112         unsigned int state_idx; /* state that genpd will go to when off */
 113         void *free; /* Free the state that was allocated for default */
 114         ktime_t on_time;
 115         ktime_t accounting_time;
 116         const struct genpd_lock_ops *lock_ops;
 117         union {
 118                 struct mutex mlock;
 119                 struct {
 120                         spinlock_t slock;
 121                         unsigned long lock_flags;
 122                 };
 123         };
 124
 125 };
 126
 127 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
 128 {
 129         return container_of(pd, struct generic_pm_domain, domain);
 130 }
 131
 132 struct gpd_link {
 133         struct generic_pm_domain *master;
 134         struct list_head master_node;
 135         struct generic_pm_domain *slave;
 136         struct list_head slave_node;
 137 };
 138
 139 struct gpd_timing_data {
 140         s64 suspend_latency_ns;
 141         s64 resume_latency_ns;
 142         s64 effective_constraint_ns;
 143         bool constraint_changed;
 144         bool cached_suspend_ok;
 145 };
 146
 147 struct pm_domain_data {
 148         struct list_head list_node;
 149         struct device *dev;
 150 };
 151
 152 struct generic_pm_domain_data {
 153         struct pm_domain_data base;
 154         struct gpd_timing_data td;
 155         struct notifier_block nb;
 156         unsigned int performance_state;
 157         void *data;
 158 };
 159
 160 #ifdef CONFIG_PM_GENERIC_DOMAINS
 161 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
 162 {
 163         return container_of(pdd, struct generic_pm_domain_data, base);
 164 }
 165
 166 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
 167 {
 168         return to_gpd_data(dev->power.subsys_data->domain_data);
 169 }
 170
 171 int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev);
 172 int pm_genpd_remove_device(struct device *dev);
 173 int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
 174                            struct generic_pm_domain *new_subdomain);
 175 int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
 176                               struct generic_pm_domain *target);
 177 int pm_genpd_init(struct generic_pm_domain *genpd,
 178                   struct dev_power_governor *gov, bool is_off);
 179 int pm_genpd_remove(struct generic_pm_domain *genpd);
 180 int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state);
 181
 182 extern struct dev_power_governor simple_qos_governor;
 183 extern struct dev_power_governor pm_domain_always_on_gov;
 184 #else
 185
 186 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
 187 {
 188         return ERR_PTR(-ENOSYS);
 189 }
 190 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
 191                                       struct device *dev)
 192 {
 193         return -ENOSYS;
 194 }
 195 static inline int pm_genpd_remove_device(struct device *dev)
 196 {
 197         return -ENOSYS;
 198 }
 199 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
 200                                          struct generic_pm_domain *new_sd)
 201 {
 202         return -ENOSYS;
 203 }
 204 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
 205                                             struct generic_pm_domain *target)
 206 {
 207         return -ENOSYS;
 208 }
 209 static inline int pm_genpd_init(struct generic_pm_domain *genpd,
 210                                 struct dev_power_governor *gov, bool is_off)
 211 {
 212         return -ENOSYS;
 213 }
 214 static inline int pm_genpd_remove(struct generic_pm_domain *genpd)
 215 {
 216         return -ENOTSUPP;
 217 }
 218
 219 static inline int dev_pm_genpd_set_performance_state(struct device *dev,
 220                                                      unsigned int state)
 221 {
 222         return -ENOTSUPP;
 223 }
 224
 225 #define simple_qos_governor             (*(struct dev_power_governor *)(NULL))
 226 #define pm_domain_always_on_gov         (*(struct dev_power_governor *)(NULL))
 227 #endif
 228
 229 #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
 230 void pm_genpd_syscore_poweroff(struct device *dev);
 231 void pm_genpd_syscore_poweron(struct device *dev);
 232 #else
 233 static inline void pm_genpd_syscore_poweroff(struct device *dev) {}
 234 static inline void pm_genpd_syscore_poweron(struct device *dev) {}
 235 #endif
 236
 237 /* OF PM domain providers */
 238 struct of_device_id;
 239
 240 typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args,
 241                                                    void *data);
 242
 243 struct genpd_onecell_data {
 244         struct generic_pm_domain **domains;
 245         unsigned int num_domains;
 246         genpd_xlate_t xlate;
 247 };
 248
 249 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
 250 int of_genpd_add_provider_simple(struct device_node *np,
 251                                  struct generic_pm_domain *genpd);
 252 int of_genpd_add_provider_onecell(struct device_node *np,
 253                                   struct genpd_onecell_data *data);
 254 void of_genpd_del_provider(struct device_node *np);
 255 int of_genpd_add_device(struct of_phandle_args *args, struct device *dev);
 256 int of_genpd_add_subdomain(struct of_phandle_args *parent,
 257                            struct of_phandle_args *new_subdomain);
 258 struct generic_pm_domain *of_genpd_remove_last(struct device_node *np);
 259 int of_genpd_parse_idle_states(struct device_node *dn,
 260                                struct genpd_power_state **states, int *n);
 261 unsigned int of_genpd_opp_to_performance_state(struct device *dev,
 262                                 struct device_node *np);
 263
 264 int genpd_dev_pm_attach(struct device *dev);
 265 struct device *genpd_dev_pm_attach_by_id(struct device *dev,
 266                                          unsigned int index);
 267 struct device *genpd_dev_pm_attach_by_name(struct device *dev,
 268                                            char *name);
 269 #else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
 270 static inline int of_genpd_add_provider_simple(struct device_node *np,
 271                                         struct generic_pm_domain *genpd)
 272 {
 273         return -ENOTSUPP;
 274 }
 275
 276 static inline int of_genpd_add_provider_onecell(struct device_node *np,
 277                                         struct genpd_onecell_data *data)
 278 {
 279         return -ENOTSUPP;
 280 }
 281
 282 static inline void of_genpd_del_provider(struct device_node *np) {}
 283
 284 static inline int of_genpd_add_device(struct of_phandle_args *args,
 285                                       struct device *dev)
 286 {
 287         return -ENODEV;
 288 }
 289
 290 static inline int of_genpd_add_subdomain(struct of_phandle_args *parent,
 291                                          struct of_phandle_args *new_subdomain)
 292 {
 293         return -ENODEV;
 294 }
 295
 296 static inline int of_genpd_parse_idle_states(struct device_node *dn,
 297                         struct genpd_power_state **states, int *n)
 298 {
 299         return -ENODEV;
 300 }
 301
 302 static inline unsigned int
 303 of_genpd_opp_to_performance_state(struct device *dev,
 304                                   struct device_node *np)
 305 {
 306         return 0;
 307 }
 308
 309 static inline int genpd_dev_pm_attach(struct device *dev)
 310 {
 311         return 0;
 312 }
 313
 314 static inline struct device *genpd_dev_pm_attach_by_id(struct device *dev,
 315                                                        unsigned int index)
 316 {
 317         return NULL;
 318 }
 319
 320 static inline struct device *genpd_dev_pm_attach_by_name(struct device *dev,
 321                                                          char *name)
 322 {
 323         return NULL;
 324 }
 325
 326 static inline
 327 struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
 328 {
 329         return ERR_PTR(-ENOTSUPP);
 330 }
 331 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
 332
 333 #ifdef CONFIG_PM
 334 int dev_pm_domain_attach(struct device *dev, bool power_on);
 335 struct device *dev_pm_domain_attach_by_id(struct device *dev,
 336                                           unsigned int index);
 337 struct device *dev_pm_domain_attach_by_name(struct device *dev,
 338                                             char *name);
 339 void dev_pm_domain_detach(struct device *dev, bool power_off);
 340 void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);
 341 #else
 342 static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
 343 {
 344         return 0;
 345 }
 346 static inline struct device *dev_pm_domain_attach_by_id(struct device *dev,
 347                                                         unsigned int index)
 348 {
 349         return NULL;
 350 }
 351 static inline struct device *dev_pm_domain_attach_by_name(struct device *dev,
 352                                                           char *name)
 353 {
 354         return NULL;
 355 }
 356 static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
 357 static inline void dev_pm_domain_set(struct device *dev,
 358                                      struct dev_pm_domain *pd) {}
 359 #endif
 360
 361 #endif /* _LINUX_PM_DOMAIN_H */