5063ce1571
Currently, for a given generic PM domain there may be only one parent domain (i.e. a PM domain it depends on). However, there is at least one real-life case in which there should be two parents (masters) for one PM domain (the A3RV domain on SH7372 turns out to depend on the A4LC domain and it depends on the A4R domain and the same time). For this reason, allow a PM domain to have multiple parents (masters) by introducing objects representing links between PM domains. The (logical) links between PM domains represent relationships in which one domain is a master (i.e. it is depended on) and another domain is a slave (i.e. it depends on the master) with the rule that the slave cannot be powered on if the master is not powered on and the master cannot be powered off if the slave is not powered off. Each struct generic_pm_domain object representing a PM domain has two lists of links, a list of links in which it is a master and a list of links in which it is a slave. The first of these lists replaces the list of subdomains and the second one is used in place of the parent pointer. Each link is represented by struct gpd_link object containing pointers to the master and the slave and two struct list_head members allowing it to hook into two lists (the master's list of "master" links and the slave's list of "slave" links). This allows the code to get to the link from each side (either from the master or from the slave) and follow it in each direction. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
120 lines
4.0 KiB
C
120 lines
4.0 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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enum gpd_status {
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GPD_STATE_ACTIVE = 0, /* PM domain is active */
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GPD_STATE_WAIT_PARENT, /* PM domain's parent 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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};
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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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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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int (*power_off)(struct generic_pm_domain *domain);
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int (*power_on)(struct generic_pm_domain *domain);
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int (*start_device)(struct device *dev);
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int (*stop_device)(struct device *dev);
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bool (*active_wakeup)(struct device *dev);
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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 dev_list_entry {
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struct list_head node;
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struct device *dev;
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bool need_restore;
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};
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#ifdef CONFIG_PM_GENERIC_DOMAINS
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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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extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
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struct device *dev);
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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 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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#else
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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 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 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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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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#endif
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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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