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 (*stop_ok)(struct device *dev);
  32 };
  33
  34 struct gpd_dev_ops {
  35         int (*start)(struct device *dev);
  36         int (*stop)(struct device *dev);
  37         int (*save_state)(struct device *dev);
  38         int (*restore_state)(struct device *dev);
  39         bool (*active_wakeup)(struct device *dev);
  40 };
  41
  42 struct genpd_power_state {
  43         s64 power_off_latency_ns;
  44         s64 power_on_latency_ns;
  45 };
  46
  47 struct generic_pm_domain {
  48         struct dev_pm_domain domain;    /* PM domain operations */
  49         struct list_head gpd_list_node; /* Node in the global PM domains list */
  50         struct list_head master_links;  /* Links with PM domain as a master */
  51         struct list_head slave_links;   /* Links with PM domain as a slave */
  52         struct list_head dev_list;      /* List of devices */
  53         struct mutex lock;
  54         struct dev_power_governor *gov;
  55         struct work_struct power_off_work;
  56         const char *name;
  57         atomic_t sd_count;      /* Number of subdomains with power "on" */
  58         enum gpd_status status; /* Current state of the domain */
  59         unsigned int device_count;      /* Number of devices */
  60         unsigned int suspended_count;   /* System suspend device counter */
  61         unsigned int prepared_count;    /* Suspend counter of prepared devices */
  62         bool suspend_power_off; /* Power status before system suspend */
  63         int (*power_off)(struct generic_pm_domain *domain);
  64         int (*power_on)(struct generic_pm_domain *domain);
  65         struct gpd_dev_ops dev_ops;
  66         s64 max_off_time_ns;    /* Maximum allowed "suspended" time. */
  67         bool max_off_time_changed;
  68         bool cached_power_down_ok;
  69         int (*attach_dev)(struct generic_pm_domain *domain,
  70                           struct device *dev);
  71         void (*detach_dev)(struct generic_pm_domain *domain,
  72                            struct device *dev);
  73         unsigned int flags;             /* Bit field of configs for genpd */
  74         struct genpd_power_state states[GENPD_MAX_NUM_STATES];
  75         unsigned int state_count; /* number of states */
  76         unsigned int state_idx; /* state that genpd will go to when off */
  77
  78 };
  79
  80 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
  81 {
  82         return container_of(pd, struct generic_pm_domain, domain);
  83 }
  84
  85 struct gpd_link {
  86         struct generic_pm_domain *master;
  87         struct list_head master_node;
  88         struct generic_pm_domain *slave;
  89         struct list_head slave_node;
  90 };
  91
  92 struct gpd_timing_data {
  93         s64 suspend_latency_ns;
  94         s64 resume_latency_ns;
  95         s64 effective_constraint_ns;
  96         bool constraint_changed;
  97         bool cached_stop_ok;
  98 };
  99
 100 struct pm_domain_data {
 101         struct list_head list_node;
 102         struct device *dev;
 103 };
 104
 105 struct generic_pm_domain_data {
 106         struct pm_domain_data base;
 107         struct gpd_timing_data td;
 108         struct notifier_block nb;
 109 };
 110
 111 #ifdef CONFIG_PM_GENERIC_DOMAINS
 112 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
 113 {
 114         return container_of(pdd, struct generic_pm_domain_data, base);
 115 }
 116
 117 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
 118 {
 119         return to_gpd_data(dev->power.subsys_data->domain_data);
 120 }
 121
 122 extern struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev);
 123 extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
 124                                  struct device *dev,
 125                                  struct gpd_timing_data *td);
 126
 127 extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
 128                                   struct device *dev);
 129 extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
 130                                   struct generic_pm_domain *new_subdomain);
 131 extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
 132                                      struct generic_pm_domain *target);
 133 extern void pm_genpd_init(struct generic_pm_domain *genpd,
 134                           struct dev_power_governor *gov, bool is_off);
 135
 136 extern struct dev_power_governor simple_qos_governor;
 137 extern struct dev_power_governor pm_domain_always_on_gov;
 138 #else
 139
 140 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
 141 {
 142         return ERR_PTR(-ENOSYS);
 143 }
 144 static inline struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev)
 145 {
 146         return NULL;
 147 }
 148 static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
 149                                         struct device *dev,
 150                                         struct gpd_timing_data *td)
 151 {
 152         return -ENOSYS;
 153 }
 154 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
 155                                          struct device *dev)
 156 {
 157         return -ENOSYS;
 158 }
 159 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
 160                                          struct generic_pm_domain *new_sd)
 161 {
 162         return -ENOSYS;
 163 }
 164 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
 165                                             struct generic_pm_domain *target)
 166 {
 167         return -ENOSYS;
 168 }
 169 static inline void pm_genpd_init(struct generic_pm_domain *genpd,
 170                                  struct dev_power_governor *gov, bool is_off)
 171 {
 172 }
 173 #endif
 174
 175 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
 176                                       struct device *dev)
 177 {
 178         return __pm_genpd_add_device(genpd, dev, NULL);
 179 }
 180
 181 #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
 182 extern void pm_genpd_syscore_poweroff(struct device *dev);
 183 extern void pm_genpd_syscore_poweron(struct device *dev);
 184 #else
 185 static inline void pm_genpd_syscore_poweroff(struct device *dev) {}
 186 static inline void pm_genpd_syscore_poweron(struct device *dev) {}
 187 #endif
 188
 189 /* OF PM domain providers */
 190 struct of_device_id;
 191
 192 struct genpd_onecell_data {
 193         struct generic_pm_domain **domains;
 194         unsigned int num_domains;
 195 };
 196
 197 typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args,
 198                                                 void *data);
 199
 200 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
 201 int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
 202                         void *data);
 203 void of_genpd_del_provider(struct device_node *np);
 204 struct generic_pm_domain *of_genpd_get_from_provider(
 205                         struct of_phandle_args *genpdspec);
 206
 207 struct generic_pm_domain *__of_genpd_xlate_simple(
 208                                         struct of_phandle_args *genpdspec,
 209                                         void *data);
 210 struct generic_pm_domain *__of_genpd_xlate_onecell(
 211                                         struct of_phandle_args *genpdspec,
 212                                         void *data);
 213
 214 int genpd_dev_pm_attach(struct device *dev);
 215 #else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
 216 static inline int __of_genpd_add_provider(struct device_node *np,
 217                                         genpd_xlate_t xlate, void *data)
 218 {
 219         return 0;
 220 }
 221 static inline void of_genpd_del_provider(struct device_node *np) {}
 222
 223 static inline struct generic_pm_domain *of_genpd_get_from_provider(
 224                         struct of_phandle_args *genpdspec)
 225 {
 226         return NULL;
 227 }
 228
 229 #define __of_genpd_xlate_simple         NULL
 230 #define __of_genpd_xlate_onecell        NULL
 231
 232 static inline int genpd_dev_pm_attach(struct device *dev)
 233 {
 234         return -ENODEV;
 235 }
 236 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
 237
 238 static inline int of_genpd_add_provider_simple(struct device_node *np,
 239                                         struct generic_pm_domain *genpd)
 240 {
 241         return __of_genpd_add_provider(np, __of_genpd_xlate_simple, genpd);
 242 }
 243 static inline int of_genpd_add_provider_onecell(struct device_node *np,
 244                                         struct genpd_onecell_data *data)
 245 {
 246         return __of_genpd_add_provider(np, __of_genpd_xlate_onecell, data);
 247 }
 248
 249 #ifdef CONFIG_PM
 250 extern int dev_pm_domain_attach(struct device *dev, bool power_on);
 251 extern void dev_pm_domain_detach(struct device *dev, bool power_off);
 252 extern void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);
 253 #else
 254 static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
 255 {
 256         return -ENODEV;
 257 }
 258 static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
 259 static inline void dev_pm_domain_set(struct device *dev,
 260                                      struct dev_pm_domain *pd) {}
 261 #endif
 262
 263 #endif /* _LINUX_PM_DOMAIN_H */