diff options
Diffstat (limited to 'include/linux/pm_domain.h')
| -rw-r--r-- | include/linux/pm_domain.h | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h new file mode 100644 index 000000000000..ba4ced38efae --- /dev/null +++ b/include/linux/pm_domain.h @@ -0,0 +1,251 @@ +/* + * pm_domain.h - Definitions and headers related to device power domains. + * + * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. + * + * This file is released under the GPLv2. + */ + +#ifndef _LINUX_PM_DOMAIN_H +#define _LINUX_PM_DOMAIN_H + +#include <linux/device.h> +#include <linux/mutex.h> +#include <linux/pm.h> +#include <linux/err.h> +#include <linux/of.h> +#include <linux/notifier.h> + +/* Defines used for the flags field in the struct generic_pm_domain */ +#define GENPD_FLAG_PM_CLK (1U << 0) /* PM domain uses PM clk */ + +enum gpd_status { + GPD_STATE_ACTIVE = 0, /* PM domain is active */ + GPD_STATE_POWER_OFF, /* PM domain is off */ +}; + +struct dev_power_governor { + bool (*power_down_ok)(struct dev_pm_domain *domain); + bool (*stop_ok)(struct device *dev); +}; + +struct gpd_dev_ops { + int (*start)(struct device *dev); + int (*stop)(struct device *dev); + int (*save_state)(struct device *dev); + int (*restore_state)(struct device *dev); + bool (*active_wakeup)(struct device *dev); +}; + +struct generic_pm_domain { + struct dev_pm_domain domain; /* PM domain operations */ + struct list_head gpd_list_node; /* Node in the global PM domains list */ + struct list_head master_links; /* Links with PM domain as a master */ + struct list_head slave_links; /* Links with PM domain as a slave */ + struct list_head dev_list; /* List of devices */ + struct mutex lock; + struct dev_power_governor *gov; + struct work_struct power_off_work; + const char *name; + atomic_t sd_count; /* Number of subdomains with power "on" */ + enum gpd_status status; /* Current state of the domain */ + unsigned int device_count; /* Number of devices */ + unsigned int suspended_count; /* System suspend device counter */ + unsigned int prepared_count; /* Suspend counter of prepared devices */ + bool suspend_power_off; /* Power status before system suspend */ + int (*power_off)(struct generic_pm_domain *domain); + s64 power_off_latency_ns; + int (*power_on)(struct generic_pm_domain *domain); + s64 power_on_latency_ns; + struct gpd_dev_ops dev_ops; + s64 max_off_time_ns; /* Maximum allowed "suspended" time. */ + bool max_off_time_changed; + bool cached_power_down_ok; + int (*attach_dev)(struct generic_pm_domain *domain, + struct device *dev); + void (*detach_dev)(struct generic_pm_domain *domain, + struct device *dev); + unsigned int flags; /* Bit field of configs for genpd */ +}; + +static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd) +{ + return container_of(pd, struct generic_pm_domain, domain); +} + +struct gpd_link { + struct generic_pm_domain *master; + struct list_head master_node; + struct generic_pm_domain *slave; + struct list_head slave_node; +}; + +struct gpd_timing_data { + s64 suspend_latency_ns; + s64 resume_latency_ns; + s64 effective_constraint_ns; + bool constraint_changed; + bool cached_stop_ok; +}; + +struct pm_domain_data { + struct list_head list_node; + struct device *dev; +}; + +struct generic_pm_domain_data { + struct pm_domain_data base; + struct gpd_timing_data td; + struct notifier_block nb; +}; + +#ifdef CONFIG_PM_GENERIC_DOMAINS +static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd) +{ + return container_of(pdd, struct generic_pm_domain_data, base); +} + +static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev) +{ + return to_gpd_data(dev->power.subsys_data->domain_data); +} + +extern struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev); +extern int __pm_genpd_add_device(struct generic_pm_domain *genpd, + struct device *dev, + struct gpd_timing_data *td); + +extern int pm_genpd_remove_device(struct generic_pm_domain *genpd, + struct device *dev); +extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, + struct generic_pm_domain *new_subdomain); +extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, + struct generic_pm_domain *target); +extern void pm_genpd_init(struct generic_pm_domain *genpd, + struct dev_power_governor *gov, bool is_off); + +extern struct dev_power_governor simple_qos_governor; +extern struct dev_power_governor pm_domain_always_on_gov; +#else + +static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev) +{ + return ERR_PTR(-ENOSYS); +} +static inline struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev) +{ + return NULL; +} +static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd, + struct device *dev, + struct gpd_timing_data *td) +{ + return -ENOSYS; +} +static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd, + struct device *dev) +{ + return -ENOSYS; +} +static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, + struct generic_pm_domain *new_sd) +{ + return -ENOSYS; +} +static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, + struct generic_pm_domain *target) +{ + return -ENOSYS; +} +static inline void pm_genpd_init(struct generic_pm_domain *genpd, + struct dev_power_governor *gov, bool is_off) +{ +} +#endif + +static inline int pm_genpd_add_device(struct generic_pm_domain *genpd, + struct device *dev) +{ + return __pm_genpd_add_device(genpd, dev, NULL); +} + +#ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP +extern void pm_genpd_syscore_poweroff(struct device *dev); +extern void pm_genpd_syscore_poweron(struct device *dev); +#else +static inline void pm_genpd_syscore_poweroff(struct device *dev) {} +static inline void pm_genpd_syscore_poweron(struct device *dev) {} +#endif + +/* OF PM domain providers */ +struct of_device_id; + +struct genpd_onecell_data { + struct generic_pm_domain **domains; + unsigned int num_domains; +}; + +typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args, + void *data); + +#ifdef CONFIG_PM_GENERIC_DOMAINS_OF +int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, + void *data); +void of_genpd_del_provider(struct device_node *np); +struct generic_pm_domain *of_genpd_get_from_provider( + struct of_phandle_args *genpdspec); + +struct generic_pm_domain *__of_genpd_xlate_simple( + struct of_phandle_args *genpdspec, + void *data); +struct generic_pm_domain *__of_genpd_xlate_onecell( + struct of_phandle_args *genpdspec, + void *data); + +int genpd_dev_pm_attach(struct device *dev); +#else /* !CONFIG_PM_GENERIC_DOMAINS_OF */ +static inline int __of_genpd_add_provider(struct device_node *np, + genpd_xlate_t xlate, void *data) +{ + return 0; +} +static inline void of_genpd_del_provider(struct device_node *np) {} + +static inline struct generic_pm_domain *of_genpd_get_from_provider( + struct of_phandle_args *genpdspec) +{ + return NULL; +} + +#define __of_genpd_xlate_simple NULL +#define __of_genpd_xlate_onecell NULL + +static inline int genpd_dev_pm_attach(struct device *dev) +{ + return -ENODEV; +} +#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ + +static inline int of_genpd_add_provider_simple(struct device_node *np, + struct generic_pm_domain *genpd) +{ + return __of_genpd_add_provider(np, __of_genpd_xlate_simple, genpd); +} +static inline int of_genpd_add_provider_onecell(struct device_node *np, + struct genpd_onecell_data *data) +{ + return __of_genpd_add_provider(np, __of_genpd_xlate_onecell, data); +} + +#ifdef CONFIG_PM +extern int dev_pm_domain_attach(struct device *dev, bool power_on); +extern void dev_pm_domain_detach(struct device *dev, bool power_off); +#else +static inline int dev_pm_domain_attach(struct device *dev, bool power_on) +{ + return -ENODEV; +} +static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {} +#endif + +#endif /* _LINUX_PM_DOMAIN_H */ |