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 enum gpd_status {
  20         GPD_STATE_ACTIVE = 0,   /* PM domain is active */
  21         GPD_STATE_WAIT_MASTER,  /* PM domain's master is being waited for */
  22         GPD_STATE_BUSY,         /* Something is happening to the PM domain */
  23         GPD_STATE_REPEAT,       /* Power off in progress, to be repeated */
  24         GPD_STATE_POWER_OFF,    /* PM domain is off */
  25 };
  26
  27 struct dev_power_governor {
  28         bool (*power_down_ok)(struct dev_pm_domain *domain);
  29         bool (*stop_ok)(struct device *dev);
  30 };
  31
  32 struct gpd_dev_ops {
  33         int (*start)(struct device *dev);
  34         int (*stop)(struct device *dev);
  35         int (*save_state)(struct device *dev);
  36         int (*restore_state)(struct device *dev);
  37         int (*suspend)(struct device *dev);
  38         int (*suspend_late)(struct device *dev);
  39         int (*resume_early)(struct device *dev);
  40         int (*resume)(struct device *dev);
  41         int (*freeze)(struct device *dev);
  42         int (*freeze_late)(struct device *dev);
  43         int (*thaw_early)(struct device *dev);
  44         int (*thaw)(struct device *dev);
  45         bool (*active_wakeup)(struct device *dev);
  46 };
  47
  48 struct generic_pm_domain {
  49         struct dev_pm_domain domain;    /* PM domain operations */
  50         struct list_head gpd_list_node; /* Node in the global PM domains list */
  51         struct list_head master_links;  /* Links with PM domain as a master */
  52         struct list_head slave_links;   /* Links with PM domain as a slave */
  53         struct list_head dev_list;      /* List of devices */
  54         struct mutex lock;
  55         struct dev_power_governor *gov;
  56         struct work_struct power_off_work;
  57         char *name;
  58         unsigned int in_progress;       /* Number of devices being suspended now */
  59         atomic_t sd_count;      /* Number of subdomains with power "on" */
  60         enum gpd_status status; /* Current state of the domain */
  61         wait_queue_head_t status_wait_queue;
  62         struct task_struct *poweroff_task;      /* Powering off task */
  63         unsigned int resume_count;      /* Number of devices being resumed */
  64         unsigned int device_count;      /* Number of devices */
  65         unsigned int suspended_count;   /* System suspend device counter */
  66         unsigned int prepared_count;    /* Suspend counter of prepared devices */
  67         bool suspend_power_off; /* Power status before system suspend */
  68         bool dev_irq_safe;      /* Device callbacks are IRQ-safe */
  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 device_node *of_node; /* Node in device tree */
  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 stop_latency_ns;
  94         s64 start_latency_ns;
  95         s64 save_state_latency_ns;
  96         s64 restore_state_latency_ns;
  97         s64 effective_constraint_ns;
  98         bool constraint_changed;
  99         bool cached_stop_ok;
 100 };
 101
 102 struct generic_pm_domain_data {
 103         struct pm_domain_data base;
 104         struct gpd_dev_ops ops;
 105         struct gpd_timing_data td;
 106         struct notifier_block nb;
 107         struct mutex lock;
 108         bool need_restore;
 109         bool always_on;
 110 };
 111
 112 #ifdef CONFIG_PM_GENERIC_DOMAINS
 113 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
 114 {
 115         return container_of(pdd, struct generic_pm_domain_data, base);
 116 }
 117
 118 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
 119 {
 120         return to_gpd_data(dev->power.subsys_data->domain_data);
 121 }
 122
 123 extern struct dev_power_governor simple_qos_governor;
 124
 125 extern struct generic_pm_domain *dev_to_genpd(struct device *dev);
 126 extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
 127                                  struct device *dev,
 128                                  struct gpd_timing_data *td);
 129
 130 extern int __pm_genpd_of_add_device(struct device_node *genpd_node,
 131                                     struct device *dev,
 132                                     struct gpd_timing_data *td);
 133
 134 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
 135                                       struct device *dev)
 136 {
 137         return __pm_genpd_add_device(genpd, dev, NULL);
 138 }
 139
 140 static inline int pm_genpd_of_add_device(struct device_node *genpd_node,
 141                                          struct device *dev)
 142 {
 143         return __pm_genpd_of_add_device(genpd_node, dev, NULL);
 144 }
 145
 146 extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
 147                                   struct device *dev);
 148 extern void pm_genpd_dev_always_on(struct device *dev, bool val);
 149 extern void pm_genpd_dev_need_restore(struct device *dev, bool val);
 150 extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
 151                                   struct generic_pm_domain *new_subdomain);
 152 extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
 153                                      struct generic_pm_domain *target);
 154 extern int pm_genpd_add_callbacks(struct device *dev,
 155                                   struct gpd_dev_ops *ops,
 156                                   struct gpd_timing_data *td);
 157 extern int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td);
 158 extern void pm_genpd_init(struct generic_pm_domain *genpd,
 159                           struct dev_power_governor *gov, bool is_off);
 160
 161 extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
 162
 163 extern bool default_stop_ok(struct device *dev);
 164
 165 extern struct dev_power_governor pm_domain_always_on_gov;
 166 #else
 167
 168 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
 169 {
 170         return ERR_PTR(-ENOSYS);
 171 }
 172 static inline struct generic_pm_domain *dev_to_genpd(struct device *dev)
 173 {
 174         return ERR_PTR(-ENOSYS);
 175 }
 176 static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
 177                                         struct device *dev,
 178                                         struct gpd_timing_data *td)
 179 {
 180         return -ENOSYS;
 181 }
 182 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
 183                                       struct device *dev)
 184 {
 185         return -ENOSYS;
 186 }
 187 static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
 188                                          struct device *dev)
 189 {
 190         return -ENOSYS;
 191 }
 192 static inline void pm_genpd_dev_always_on(struct device *dev, bool val) {}
 193 static inline void pm_genpd_dev_need_restore(struct device *dev, bool val) {}
 194 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
 195                                          struct generic_pm_domain *new_sd)
 196 {
 197         return -ENOSYS;
 198 }
 199 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
 200                                             struct generic_pm_domain *target)
 201 {
 202         return -ENOSYS;
 203 }
 204 static inline int pm_genpd_add_callbacks(struct device *dev,
 205                                          struct gpd_dev_ops *ops,
 206                                          struct gpd_timing_data *td)
 207 {
 208         return -ENOSYS;
 209 }
 210 static inline int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td)
 211 {
 212         return -ENOSYS;
 213 }
 214 static inline void pm_genpd_init(struct generic_pm_domain *genpd,
 215                                  struct dev_power_governor *gov, bool is_off)
 216 {
 217 }
 218 static inline int pm_genpd_poweron(struct generic_pm_domain *genpd)
 219 {
 220         return -ENOSYS;
 221 }
 222 static inline bool default_stop_ok(struct device *dev)
 223 {
 224         return false;
 225 }
 226 #define simple_qos_governor NULL
 227 #define pm_domain_always_on_gov NULL
 228 #endif
 229
 230 static inline int pm_genpd_remove_callbacks(struct device *dev)
 231 {
 232         return __pm_genpd_remove_callbacks(dev, true);
 233 }
 234
 235 #ifdef CONFIG_PM_GENERIC_DOMAINS_RUNTIME
 236 extern void genpd_queue_power_off_work(struct generic_pm_domain *genpd);
 237 extern void pm_genpd_poweroff_unused(void);
 238 #else
 239 static inline void genpd_queue_power_off_work(struct generic_pm_domain *gpd) {}
 240 static inline void pm_genpd_poweroff_unused(void) {}
 241 #endif
 242
 243 #endif /* _LINUX_PM_DOMAIN_H */