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1/*
2 * Copyright (C) 2011 Google, Inc.
3 *
4 * Author:
5 * Colin Cross <ccross@android.com>
6 *
7 * This software is licensed under the terms of the GNU General Public
8 * License version 2, as published by the Free Software Foundation, and
9 * may be copied, distributed, and modified under those terms.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 */
17
18#ifndef _LINUX_CPU_PM_H
19#define _LINUX_CPU_PM_H
20
21#include <linux/kernel.h>
22#include <linux/notifier.h>
23
24/*
25 * When a CPU goes to a low power state that turns off power to the CPU's
26 * power domain, the contents of some blocks (floating point coprocessors,
27 * interrupt controllers, caches, timers) in the same power domain can
28 * be lost. The cpm_pm notifiers provide a method for platform idle, suspend,
29 * and hotplug implementations to notify the drivers for these blocks that
30 * they may be reset.
31 *
32 * All cpu_pm notifications must be called with interrupts disabled.
33 *
34 * The notifications are split into two classes: CPU notifications and CPU
35 * cluster notifications.
36 *
37 * CPU notifications apply to a single CPU and must be called on the affected
38 * CPU. They are used to save per-cpu context for affected blocks.
39 *
40 * CPU cluster notifications apply to all CPUs in a single power domain. They
41 * are used to save any global context for affected blocks, and must be called
42 * after all the CPUs in the power domain have been notified of the low power
43 * state.
44 */
45
46/*
47 * Event codes passed as unsigned long val to notifier calls
48 */
49enum cpu_pm_event {
50 /* A single cpu is entering a low power state */
51 CPU_PM_ENTER,
52
53 /* A single cpu failed to enter a low power state */
54 CPU_PM_ENTER_FAILED,
55
56 /* A single cpu is exiting a low power state */
57 CPU_PM_EXIT,
58
59 /* A cpu power domain is entering a low power state */
60 CPU_CLUSTER_PM_ENTER,
61
62 /* A cpu power domain failed to enter a low power state */
63 CPU_CLUSTER_PM_ENTER_FAILED,
64
65 /* A cpu power domain is exiting a low power state */
66 CPU_CLUSTER_PM_EXIT,
67};
68
69#ifdef CONFIG_CPU_PM
70int cpu_pm_register_notifier(struct notifier_block *nb);
71int cpu_pm_unregister_notifier(struct notifier_block *nb);
72int cpu_pm_enter(void);
73int cpu_pm_exit(void);
74int cpu_cluster_pm_enter(void);
75int cpu_cluster_pm_exit(void);
76
77#else
78
79static inline int cpu_pm_register_notifier(struct notifier_block *nb)
80{
81 return 0;
82}
83
84static inline int cpu_pm_unregister_notifier(struct notifier_block *nb)
85{
86 return 0;
87}
88
89static inline int cpu_pm_enter(void)
90{
91 return 0;
92}
93
94static inline int cpu_pm_exit(void)
95{
96 return 0;
97}
98
99static inline int cpu_cluster_pm_enter(void)
100{
101 return 0;
102}
103
104static inline int cpu_cluster_pm_exit(void)
105{
106 return 0;
107}
108#endif
109#endif
110

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