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
  19 /* Defines used for the flags field in the struct generic_pm_domain */
  20 #define GENPD_FLAG_PM_CLK       (1U << 0) /* PM domain uses PM clk */
  21
  22 #define GENPD_MAX_NUM_STATES    8 /* Number of possible low power states */
  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 };
  44
  45 struct generic_pm_domain {
  46         struct dev_pm_domain domain;    /* PM domain operations */
  47         struct list_head gpd_list_node; /* Node in the global PM domains list */
  48         struct list_head master_links;  /* Links with PM domain as a master */
  49         struct list_head slave_links;   /* Links with PM domain as a slave */
  50         struct list_head dev_list;      /* List of devices */
  51         struct mutex lock;
  52         struct dev_power_governor *gov;
  53         struct work_struct power_off_work;
  54         const char *name;
  55         atomic_t sd_count;      /* Number of subdomains with power "on" */
  56         enum gpd_status status; /* Current state of the domain */
  57         unsigned int device_count;      /* Number of devices */
  58         unsigned int suspended_count;   /* System suspend device counter */
  59         unsigned int prepared_count;    /* Suspend counter of prepared devices */
  60         int (*power_off)(struct generic_pm_domain *domain);
  61         int (*power_on)(struct generic_pm_domain *domain);
  62         struct gpd_dev_ops dev_ops;
  63         s64 max_off_time_ns;    /* Maximum allowed "suspended" time. */
  64         bool max_off_time_changed;
  65         bool cached_power_down_ok;
  66         int (*attach_dev)(struct generic_pm_domain *domain,
  67                           struct device *dev);
  68         void (*detach_dev)(struct generic_pm_domain *domain,
  69                            struct device *dev);
  70         unsigned int flags;             /* Bit field of configs for genpd */
  71         struct genpd_power_state states[GENPD_MAX_NUM_STATES];
  72         unsigned int state_count; /* number of states */
  73         unsigned int state_idx; /* state that genpd will go to when off */
  74
  75 };
  76
  77 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
  78 {
  79         return container_of(pd, struct generic_pm_domain, domain);
  80 }
  81
  82 struct gpd_link {
  83         struct generic_pm_domain *master;
  84         struct list_head master_node;
  85         struct generic_pm_domain *slave;
  86         struct list_head slave_node;
  87 };
  88
  89 struct gpd_timing_data {
  90         s64 suspend_latency_ns;
  91         s64 resume_latency_ns;
  92         s64 effective_constraint_ns;
  93         bool constraint_changed;
  94         bool cached_suspend_ok;
  95 };
  96
  97 struct pm_domain_data {
  98         struct list_head list_node;
  99         struct device *dev;
 100 };
 101
 102 struct generic_pm_domain_data {
 103         struct pm_domain_data base;
 104         struct gpd_timing_data td;
 105         struct notifier_block nb;
 106 };
 107
 108 #ifdef CONFIG_PM_GENERIC_DOMAINS
 109 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
 110 {
 111         return container_of(pdd, struct generic_pm_domain_data, base);
 112 }
 113
 114 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
 115 {
 116         return to_gpd_data(dev->power.subsys_data->domain_data);
 117 }
 118
 119 extern struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev);
 120 extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
 121                                  struct device *dev,
 122                                  struct gpd_timing_data *td);
 123
 124 extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
 125                                   struct device *dev);
 126 extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
 127                                   struct generic_pm_domain *new_subdomain);
 128 extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
 129                                      struct generic_pm_domain *target);
 130 extern int pm_genpd_init(struct generic_pm_domain *genpd,
 131                          struct dev_power_governor *gov, bool is_off);
 132
 133 extern struct dev_power_governor simple_qos_governor;
 134 extern struct dev_power_governor pm_domain_always_on_gov;
 135 #else
 136
 137 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
 138 {
 139         return ERR_PTR(-ENOSYS);
 140 }
 141 static inline struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev)
 142 {
 143         return NULL;
 144 }
 145 static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
 146                                         struct device *dev,
 147                                         struct gpd_timing_data *td)
 148 {
 149         return -ENOSYS;
 150 }
 151 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
 152                                          struct device *dev)
 153 {
 154         return -ENOSYS;
 155 }
 156 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
 157                                          struct generic_pm_domain *new_sd)
 158 {
 159         return -ENOSYS;
 160 }
 161 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
 162                                             struct generic_pm_domain *target)
 163 {
 164         return -ENOSYS;
 165 }
 166 static inline int pm_genpd_init(struct generic_pm_domain *genpd,
 167                                 struct dev_power_governor *gov, bool is_off)
 168 {
 169         return -ENOSYS;
 170 }
 171 #endif
 172
 173 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
 174                                       struct device *dev)
 175 {
 176         return __pm_genpd_add_device(genpd, dev, NULL);
 177 }
 178
 179 #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
 180 extern void pm_genpd_syscore_poweroff(struct device *dev);
 181 extern void pm_genpd_syscore_poweron(struct device *dev);
 182 #else
 183 static inline void pm_genpd_syscore_poweroff(struct device *dev) {}
 184 static inline void pm_genpd_syscore_poweron(struct device *dev) {}
 185 #endif
 186
 187 /* OF PM domain providers */
 188 struct of_device_id;
 189
 190 struct genpd_onecell_data {
 191         struct generic_pm_domain **domains;
 192         unsigned int num_domains;
 193 };
 194
 195 typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args,
 196                                                 void *data);
 197
 198 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
 199 int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
 200                         void *data);
 201 void of_genpd_del_provider(struct device_node *np);
 202 struct generic_pm_domain *of_genpd_get_from_provider(
 203                         struct of_phandle_args *genpdspec);
 204
 205 struct generic_pm_domain *__of_genpd_xlate_simple(
 206                                         struct of_phandle_args *genpdspec,
 207                                         void *data);
 208 struct generic_pm_domain *__of_genpd_xlate_onecell(
 209                                         struct of_phandle_args *genpdspec,
 210                                         void *data);
 211
 212 int genpd_dev_pm_attach(struct device *dev);
 213 #else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
 214 static inline int __of_genpd_add_provider(struct device_node *np,
 215                                         genpd_xlate_t xlate, void *data)
 216 {
 217         return 0;
 218 }
 219 static inline void of_genpd_del_provider(struct device_node *np) {}
 220
 221 static inline struct generic_pm_domain *of_genpd_get_from_provider(
 222                         struct of_phandle_args *genpdspec)
 223 {
 224         return NULL;
 225 }
 226
 227 #define __of_genpd_xlate_simple         NULL
 228 #define __of_genpd_xlate_onecell        NULL
 229
 230 static inline int genpd_dev_pm_attach(struct device *dev)
 231 {
 232         return -ENODEV;
 233 }
 234 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
 235
 236 static inline int of_genpd_add_provider_simple(struct device_node *np,
 237                                         struct generic_pm_domain *genpd)
 238 {
 239         return __of_genpd_add_provider(np, __of_genpd_xlate_simple, genpd);
 240 }
 241 static inline int of_genpd_add_provider_onecell(struct device_node *np,
 242                                         struct genpd_onecell_data *data)
 243 {
 244         return __of_genpd_add_provider(np, __of_genpd_xlate_onecell, data);
 245 }
 246
 247 #ifdef CONFIG_PM
 248 extern int dev_pm_domain_attach(struct device *dev, bool power_on);
 249 extern void dev_pm_domain_detach(struct device *dev, bool power_off);
 250 extern void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);
 251 #else
 252 static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
 253 {
 254         return -ENODEV;
 255 }
 256 static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
 257 static inline void dev_pm_domain_set(struct device *dev,
 258                                      struct dev_pm_domain *pd) {}
 259 #endif
 260
 261 #endif /* _LINUX_PM_DOMAIN_H */