diff options
author | Arnd Bergmann <arnd@arndb.de> | 2011-10-31 14:08:10 +0100 |
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committer | Arnd Bergmann <arnd@arndb.de> | 2011-10-31 14:08:10 +0100 |
commit | 08cab72f91c8b28ffabfd143119bccdd4a115ad7 (patch) | |
tree | ccd5583971caecd82bf2d1e62691bf6e0362d650 /include/linux/cpu_pm.h | |
parent | 86c1e5a74af11e4817ffa6d7748d9ac1353b5b53 (diff) | |
parent | f37a53cc5d8a8fb199e41386d125d8c2ed9e54ef (diff) |
Merge branch 'dt/gic' into next/dt
Conflicts:
arch/arm/include/asm/localtimer.h
arch/arm/mach-msm/board-msm8x60.c
arch/arm/mach-omap2/board-generic.c
Diffstat (limited to 'include/linux/cpu_pm.h')
-rw-r--r-- | include/linux/cpu_pm.h | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/include/linux/cpu_pm.h b/include/linux/cpu_pm.h new file mode 100644 index 000000000000..455b233dd3b1 --- /dev/null +++ b/include/linux/cpu_pm.h @@ -0,0 +1,109 @@ +/* + * 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(void); +int cpu_cluster_pm_exit(void); + +#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(void) +{ + return 0; +} + +static inline int cpu_cluster_pm_exit(void) +{ + return 0; +} +#endif +#endif |