| /* |
| * Copyright (C) 2011 Google, Inc. |
| * |
| * Author: |
| * Colin Cross <ccross@android.com> |
| * |
| * This software is licensed under the terms of the GNU General Public |
| * License version 2, as published by the Free Software Foundation, and |
| * may be copied, distributed, and modified under those terms. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| */ |
| |
| #ifndef _LINUX_CPU_PM_H |
| #define _LINUX_CPU_PM_H |
| |
| #include <linux/kernel.h> |
| #include <linux/notifier.h> |
| |
| /* |
| * 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(unsigned long aff_level); |
| int cpu_cluster_pm_exit(unsigned long aff_level); |
| |
| #else |
| |
| static inline int cpu_pm_register_notifier(struct notifier_block *nb) |
| { |
| return 0; |
| } |
| |
| static inline int cpu_pm_unregister_notifier(struct notifier_block *nb) |
| { |
| return 0; |
| } |
| |
| static inline int cpu_pm_enter(void) |
| { |
| return 0; |
| } |
| |
| static inline int cpu_pm_exit(void) |
| { |
| return 0; |
| } |
| |
| static inline int cpu_cluster_pm_enter(unsigned long aff_level) |
| { |
| return 0; |
| } |
| |
| static inline int cpu_cluster_pm_exit(unsigned long aff_level) |
| { |
| return 0; |
| } |
| #endif |
| #endif |