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 /* 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 #define GENPD_FLAG_IRQ_SAFE     (1U << 1) /* PM domain operates in atomic */
  23
  24 enum gpd_status {
  25         GPD_STATE_ACTIVE = 0,   /* PM domain is active */
  26         GPD_STATE_POWER_OFF,    /* PM domain is off */
  27 };
  28
  29 struct dev_power_governor {
  30         bool (*power_down_ok)(struct dev_pm_domain *domain);
  31         bool (*suspend_ok)(struct device *dev);
  32 };
  33
  34 struct gpd_dev_ops {
  35         int (*start)(struct device *dev);
  36         int (*stop)(struct device *dev);
  37         bool (*active_wakeup)(struct device *dev);
  38 };
  39
  40 struct genpd_power_state {
  41         s64 power_off_latency_ns;
  42         s64 power_on_latency_ns;
  43         s64 residency_ns;
  44         struct fwnode_handle *fwnode;
  45 };
  46
  47 struct genpd_lock_ops;
  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 dev_power_governor *gov;
  56         struct work_struct power_off_work;
  57         struct fwnode_handle *provider; /* Identity of the domain provider */
  58         bool has_provider;
  59         const char *name;
  60         atomic_t sd_count;      /* Number of subdomains with power "on" */
  61         enum gpd_status status; /* Current state of the domain */
  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         int (*power_off)(struct generic_pm_domain *domain);
  66         int (*power_on)(struct generic_pm_domain *domain);
  67         struct gpd_dev_ops dev_ops;
  68         s64 max_off_time_ns;    /* Maximum allowed "suspended" time. */
  69         bool max_off_time_changed;
  70         bool cached_power_down_ok;
  71         int (*attach_dev)(struct generic_pm_domain *domain,
  72                           struct device *dev);
  73         void (*detach_dev)(struct generic_pm_domain *domain,
  74                            struct device *dev);
  75         unsigned int flags;             /* Bit field of configs for genpd */
  76         struct genpd_power_state *states;
  77         unsigned int state_count; /* number of states */
  78         unsigned int state_idx; /* state that genpd will go to when off */
  79         void *free; /* Free the state that was allocated for default */
  80         const struct genpd_lock_ops *lock_ops;
  81         union {
  82                 struct mutex mlock;
  83                 struct {
  84                         spinlock_t slock;
  85                         unsigned long lock_flags;
  86                 };
  87         };
  88
  89 };
  90
  91 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
  92 {
  93         return container_of(pd, struct generic_pm_domain, domain);
  94 }
  95
  96 struct gpd_link {
  97         struct generic_pm_domain *master;
  98         struct list_head master_node;
  99         struct generic_pm_domain *slave;
 100         struct list_head slave_node;
 101 };
 102
 103 struct gpd_timing_data {
 104         s64 suspend_latency_ns;
 105         s64 resume_latency_ns;
 106         s64 effective_constraint_ns;
 107         bool constraint_changed;
 108         bool cached_suspend_ok;
 109 };
 110
 111 struct pm_domain_data {
 112         struct list_head list_node;
 113         struct device *dev;
 114 };
 115
 116 struct generic_pm_domain_data {
 117         struct pm_domain_data base;
 118         struct gpd_timing_data td;
 119         struct notifier_block nb;
 120 };
 121
 122 #ifdef CONFIG_PM_GENERIC_DOMAINS
 123 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
 124 {
 125         return container_of(pdd, struct generic_pm_domain_data, base);
 126 }
 127
 128 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
 129 {
 130         return to_gpd_data(dev->power.subsys_data->domain_data);
 131 }
 132
 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_remove_device(struct generic_pm_domain *genpd,
 138                                   struct device *dev);
 139 extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
 140                                   struct generic_pm_domain *new_subdomain);
 141 extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
 142                                      struct generic_pm_domain *target);
 143 extern int pm_genpd_init(struct generic_pm_domain *genpd,
 144                          struct dev_power_governor *gov, bool is_off);
 145 extern int pm_genpd_remove(struct generic_pm_domain *genpd);
 146
 147 extern struct dev_power_governor simple_qos_governor;
 148 extern struct dev_power_governor pm_domain_always_on_gov;
 149 #else
 150
 151 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
 152 {
 153         return ERR_PTR(-ENOSYS);
 154 }
 155 static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
 156                                         struct device *dev,
 157                                         struct gpd_timing_data *td)
 158 {
 159         return -ENOSYS;
 160 }
 161 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
 162                                          struct device *dev)
 163 {
 164         return -ENOSYS;
 165 }
 166 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
 167                                          struct generic_pm_domain *new_sd)
 168 {
 169         return -ENOSYS;
 170 }
 171 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
 172                                             struct generic_pm_domain *target)
 173 {
 174         return -ENOSYS;
 175 }
 176 static inline int pm_genpd_init(struct generic_pm_domain *genpd,
 177                                 struct dev_power_governor *gov, bool is_off)
 178 {
 179         return -ENOSYS;
 180 }
 181 static inline int pm_genpd_remove(struct generic_pm_domain *genpd)
 182 {
 183         return -ENOTSUPP;
 184 }
 185
 186 #define simple_qos_governor             (*(struct dev_power_governor *)(NULL))
 187 #define pm_domain_always_on_gov         (*(struct dev_power_governor *)(NULL))
 188 #endif
 189
 190 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
 191                                       struct device *dev)
 192 {
 193         return __pm_genpd_add_device(genpd, dev, NULL);
 194 }
 195
 196 #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
 197 extern void pm_genpd_syscore_poweroff(struct device *dev);
 198 extern void pm_genpd_syscore_poweron(struct device *dev);
 199 #else
 200 static inline void pm_genpd_syscore_poweroff(struct device *dev) {}
 201 static inline void pm_genpd_syscore_poweron(struct device *dev) {}
 202 #endif
 203
 204 /* OF PM domain providers */
 205 struct of_device_id;
 206
 207 struct genpd_onecell_data {
 208         struct generic_pm_domain **domains;
 209         unsigned int num_domains;
 210 };
 211
 212 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
 213 int of_genpd_add_provider_simple(struct device_node *np,
 214                                  struct generic_pm_domain *genpd);
 215 int of_genpd_add_provider_onecell(struct device_node *np,
 216                                   struct genpd_onecell_data *data);
 217 void of_genpd_del_provider(struct device_node *np);
 218 extern int of_genpd_add_device(struct of_phandle_args *args,
 219                                struct device *dev);
 220 extern int of_genpd_add_subdomain(struct of_phandle_args *parent,
 221                                   struct of_phandle_args *new_subdomain);
 222 extern struct generic_pm_domain *of_genpd_remove_last(struct device_node *np);
 223 extern int of_genpd_parse_idle_states(struct device_node *dn,
 224                         struct genpd_power_state **states, int *n);
 225
 226 int genpd_dev_pm_attach(struct device *dev);
 227 #else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
 228 static inline int of_genpd_add_provider_simple(struct device_node *np,
 229                                         struct generic_pm_domain *genpd)
 230 {
 231         return -ENOTSUPP;
 232 }
 233
 234 static inline int of_genpd_add_provider_onecell(struct device_node *np,
 235                                         struct genpd_onecell_data *data)
 236 {
 237         return -ENOTSUPP;
 238 }
 239
 240 static inline void of_genpd_del_provider(struct device_node *np) {}
 241
 242 static inline int of_genpd_add_device(struct of_phandle_args *args,
 243                                       struct device *dev)
 244 {
 245         return -ENODEV;
 246 }
 247
 248 static inline int of_genpd_add_subdomain(struct of_phandle_args *parent,
 249                                          struct of_phandle_args *new_subdomain)
 250 {
 251         return -ENODEV;
 252 }
 253
 254 static inline int of_genpd_parse_idle_states(struct device_node *dn,
 255                         struct genpd_power_state **states, int *n)
 256 {
 257         return -ENODEV;
 258 }
 259
 260 static inline int genpd_dev_pm_attach(struct device *dev)
 261 {
 262         return -ENODEV;
 263 }
 264
 265 static inline
 266 struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
 267 {
 268         return ERR_PTR(-ENOTSUPP);
 269 }
 270 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
 271
 272 #ifdef CONFIG_PM
 273 extern int dev_pm_domain_attach(struct device *dev, bool power_on);
 274 extern void dev_pm_domain_detach(struct device *dev, bool power_off);
 275 extern void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);
 276 #else
 277 static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
 278 {
 279         return -ENODEV;
 280 }
 281 static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
 282 static inline void dev_pm_domain_set(struct device *dev,
 283                                      struct dev_pm_domain *pd) {}
 284 #endif
 285
 286 #endif /* _LINUX_PM_DOMAIN_H */