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3d739985 JL |
1 | /* linux/arch/arm/mach-exynos4/cpuidle.c |
2 | * | |
3 | * Copyright (c) 2011 Samsung Electronics Co., Ltd. | |
4 | * http://www.samsung.com | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/kernel.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/cpuidle.h> | |
14 | #include <linux/io.h> | |
15 | ||
16 | #include <asm/proc-fns.h> | |
17 | ||
18 | static int exynos4_enter_idle(struct cpuidle_device *dev, | |
19 | struct cpuidle_state *state); | |
20 | ||
21 | static struct cpuidle_state exynos4_cpuidle_set[] = { | |
22 | [0] = { | |
23 | .enter = exynos4_enter_idle, | |
24 | .exit_latency = 1, | |
25 | .target_residency = 100000, | |
26 | .flags = CPUIDLE_FLAG_TIME_VALID, | |
27 | .name = "IDLE", | |
28 | .desc = "ARM clock gating(WFI)", | |
29 | }, | |
30 | }; | |
31 | ||
32 | static DEFINE_PER_CPU(struct cpuidle_device, exynos4_cpuidle_device); | |
33 | ||
34 | static struct cpuidle_driver exynos4_idle_driver = { | |
35 | .name = "exynos4_idle", | |
36 | .owner = THIS_MODULE, | |
37 | }; | |
38 | ||
39 | static int exynos4_enter_idle(struct cpuidle_device *dev, | |
40 | struct cpuidle_state *state) | |
41 | { | |
42 | struct timeval before, after; | |
43 | int idle_time; | |
44 | ||
45 | local_irq_disable(); | |
46 | do_gettimeofday(&before); | |
47 | ||
48 | cpu_do_idle(); | |
49 | ||
50 | do_gettimeofday(&after); | |
51 | local_irq_enable(); | |
52 | idle_time = (after.tv_sec - before.tv_sec) * USEC_PER_SEC + | |
53 | (after.tv_usec - before.tv_usec); | |
54 | ||
55 | return idle_time; | |
56 | } | |
57 | ||
58 | static int __init exynos4_init_cpuidle(void) | |
59 | { | |
60 | int i, max_cpuidle_state, cpu_id; | |
61 | struct cpuidle_device *device; | |
62 | ||
63 | cpuidle_register_driver(&exynos4_idle_driver); | |
64 | ||
65 | for_each_cpu(cpu_id, cpu_online_mask) { | |
66 | device = &per_cpu(exynos4_cpuidle_device, cpu_id); | |
67 | device->cpu = cpu_id; | |
68 | ||
69 | device->state_count = (sizeof(exynos4_cpuidle_set) / | |
70 | sizeof(struct cpuidle_state)); | |
71 | ||
72 | max_cpuidle_state = device->state_count; | |
73 | ||
74 | for (i = 0; i < max_cpuidle_state; i++) { | |
75 | memcpy(&device->states[i], &exynos4_cpuidle_set[i], | |
76 | sizeof(struct cpuidle_state)); | |
77 | } | |
78 | ||
79 | if (cpuidle_register_device(device)) { | |
80 | printk(KERN_ERR "CPUidle register device failed\n,"); | |
81 | return -EIO; | |
82 | } | |
83 | } | |
84 | return 0; | |
85 | } | |
86 | device_initcall(exynos4_init_cpuidle); |