237 lines
7.2 KiB
C
237 lines
7.2 KiB
C
/*
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* pm_domain.h - Definitions and headers related to device power domains.
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*
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* Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
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*
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* This file is released under the GPLv2.
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*/
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#ifndef _LINUX_PM_DOMAIN_H
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#define _LINUX_PM_DOMAIN_H
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#include <linux/device.h>
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#include <linux/mutex.h>
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#include <linux/pm.h>
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#include <linux/err.h>
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#include <linux/of.h>
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enum gpd_status {
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GPD_STATE_ACTIVE = 0, /* PM domain is active */
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GPD_STATE_WAIT_MASTER, /* PM domain's master is being waited for */
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GPD_STATE_BUSY, /* Something is happening to the PM domain */
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GPD_STATE_REPEAT, /* Power off in progress, to be repeated */
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GPD_STATE_POWER_OFF, /* PM domain is off */
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};
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struct dev_power_governor {
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bool (*power_down_ok)(struct dev_pm_domain *domain);
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bool (*stop_ok)(struct device *dev);
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};
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struct gpd_dev_ops {
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int (*start)(struct device *dev);
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int (*stop)(struct device *dev);
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int (*save_state)(struct device *dev);
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int (*restore_state)(struct device *dev);
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int (*suspend)(struct device *dev);
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int (*suspend_late)(struct device *dev);
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int (*resume_early)(struct device *dev);
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int (*resume)(struct device *dev);
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int (*freeze)(struct device *dev);
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int (*freeze_late)(struct device *dev);
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int (*thaw_early)(struct device *dev);
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int (*thaw)(struct device *dev);
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bool (*active_wakeup)(struct device *dev);
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};
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struct generic_pm_domain {
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struct dev_pm_domain domain; /* PM domain operations */
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struct list_head gpd_list_node; /* Node in the global PM domains list */
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struct list_head master_links; /* Links with PM domain as a master */
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struct list_head slave_links; /* Links with PM domain as a slave */
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struct list_head dev_list; /* List of devices */
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struct mutex lock;
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struct dev_power_governor *gov;
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struct work_struct power_off_work;
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char *name;
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unsigned int in_progress; /* Number of devices being suspended now */
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atomic_t sd_count; /* Number of subdomains with power "on" */
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enum gpd_status status; /* Current state of the domain */
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wait_queue_head_t status_wait_queue;
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struct task_struct *poweroff_task; /* Powering off task */
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unsigned int resume_count; /* Number of devices being resumed */
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unsigned int device_count; /* Number of devices */
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unsigned int suspended_count; /* System suspend device counter */
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unsigned int prepared_count; /* Suspend counter of prepared devices */
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bool suspend_power_off; /* Power status before system suspend */
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bool dev_irq_safe; /* Device callbacks are IRQ-safe */
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int (*power_off)(struct generic_pm_domain *domain);
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s64 power_off_latency_ns;
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int (*power_on)(struct generic_pm_domain *domain);
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s64 power_on_latency_ns;
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struct gpd_dev_ops dev_ops;
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s64 break_even_ns; /* Power break even for the entire domain. */
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s64 max_off_time_ns; /* Maximum allowed "suspended" time. */
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ktime_t power_off_time;
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struct device_node *of_node; /* Node in device tree */
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};
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static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
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{
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return container_of(pd, struct generic_pm_domain, domain);
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}
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struct gpd_link {
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struct generic_pm_domain *master;
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struct list_head master_node;
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struct generic_pm_domain *slave;
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struct list_head slave_node;
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};
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struct gpd_timing_data {
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s64 stop_latency_ns;
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s64 start_latency_ns;
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s64 save_state_latency_ns;
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s64 restore_state_latency_ns;
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s64 break_even_ns;
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};
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struct generic_pm_domain_data {
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struct pm_domain_data base;
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struct gpd_dev_ops ops;
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struct gpd_timing_data td;
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bool need_restore;
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bool always_on;
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};
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#ifdef CONFIG_PM_GENERIC_DOMAINS
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static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
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{
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return container_of(pdd, struct generic_pm_domain_data, base);
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}
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static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
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{
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return to_gpd_data(dev->power.subsys_data->domain_data);
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}
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extern struct dev_power_governor simple_qos_governor;
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extern struct generic_pm_domain *dev_to_genpd(struct device *dev);
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extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
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struct device *dev,
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struct gpd_timing_data *td);
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extern int __pm_genpd_of_add_device(struct device_node *genpd_node,
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struct device *dev,
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struct gpd_timing_data *td);
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static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
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struct device *dev)
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{
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return __pm_genpd_add_device(genpd, dev, NULL);
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}
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static inline int pm_genpd_of_add_device(struct device_node *genpd_node,
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struct device *dev)
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{
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return __pm_genpd_of_add_device(genpd_node, dev, NULL);
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}
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extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
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struct device *dev);
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extern void pm_genpd_dev_always_on(struct device *dev, bool val);
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extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
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struct generic_pm_domain *new_subdomain);
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extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
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struct generic_pm_domain *target);
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extern int pm_genpd_add_callbacks(struct device *dev,
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struct gpd_dev_ops *ops,
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struct gpd_timing_data *td);
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extern int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td);
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extern void pm_genpd_init(struct generic_pm_domain *genpd,
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struct dev_power_governor *gov, bool is_off);
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extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
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extern bool default_stop_ok(struct device *dev);
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extern struct dev_power_governor pm_domain_always_on_gov;
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#else
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static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline struct generic_pm_domain *dev_to_genpd(struct device *dev)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
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struct device *dev,
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struct gpd_timing_data *td)
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{
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return -ENOSYS;
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}
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static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
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struct device *dev)
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{
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return -ENOSYS;
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}
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static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
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struct device *dev)
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{
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return -ENOSYS;
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}
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static inline void pm_genpd_dev_always_on(struct device *dev, bool val) {}
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static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
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struct generic_pm_domain *new_sd)
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{
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return -ENOSYS;
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}
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static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
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struct generic_pm_domain *target)
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{
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return -ENOSYS;
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}
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static inline int pm_genpd_add_callbacks(struct device *dev,
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struct gpd_dev_ops *ops,
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struct gpd_timing_data *td)
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{
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return -ENOSYS;
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}
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static inline int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td)
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{
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return -ENOSYS;
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}
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static inline void pm_genpd_init(struct generic_pm_domain *genpd,
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struct dev_power_governor *gov, bool is_off)
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{
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}
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static inline int pm_genpd_poweron(struct generic_pm_domain *genpd)
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{
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return -ENOSYS;
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}
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static inline bool default_stop_ok(struct device *dev)
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{
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return false;
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}
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#define simple_qos_governor NULL
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#define pm_domain_always_on_gov NULL
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#endif
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static inline int pm_genpd_remove_callbacks(struct device *dev)
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{
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return __pm_genpd_remove_callbacks(dev, true);
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}
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#ifdef CONFIG_PM_GENERIC_DOMAINS_RUNTIME
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extern void genpd_queue_power_off_work(struct generic_pm_domain *genpd);
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extern void pm_genpd_poweroff_unused(void);
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#else
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static inline void genpd_queue_power_off_work(struct generic_pm_domain *gpd) {}
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static inline void pm_genpd_poweroff_unused(void) {}
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#endif
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#endif /* _LINUX_PM_DOMAIN_H */
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