/* * When a CPU goes to a low power state that turns off power to the CPU's * power domain, the contents of some blocks (floating point coprocessors, * interrupt controllers, caches, timers) in the same power domain can * be lost. The cpm_pm notifiers provide a method for platform idle, suspend, * and hotplug implementations to notify the drivers for these blocks that * they may be reset. * * All cpu_pm notifications must be called with interrupts disabled. * * The notifications are split into two classes: CPU notifications and CPU * cluster notifications. * * CPU notifications apply to a single CPU and must be called on the affected * CPU. They are used to save per-cpu context for affected blocks. * * CPU cluster notifications apply to all CPUs in a single power domain. They * are used to save any global context for affected blocks, and must be called * after all the CPUs in the power domain have been notified of the low power * state.
*/
/* * Event codes passed as unsigned long val to notifier calls
*/ enum cpu_pm_event { /* A single cpu is entering a low power state */
CPU_PM_ENTER,
/* A single cpu failed to enter a low power state */
CPU_PM_ENTER_FAILED,
/* A single cpu is exiting a low power state */
CPU_PM_EXIT,
/* A cpu power domain is entering a low power state */
CPU_CLUSTER_PM_ENTER,
/* A cpu power domain failed to enter a low power state */
CPU_CLUSTER_PM_ENTER_FAILED,
/* A cpu power domain is exiting a low power state */
CPU_CLUSTER_PM_EXIT,
};
#ifdef CONFIG_CPU_PM int cpu_pm_register_notifier(struct notifier_block *nb); int cpu_pm_unregister_notifier(struct notifier_block *nb); int cpu_pm_enter(void); int cpu_pm_exit(void); int cpu_cluster_pm_enter(void); int cpu_cluster_pm_exit(void);
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