Commit | Line | Data |
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7880e45e | 1 | /* linux/arch/arm/mach-exynos/cpuidle.c |
3d739985 JL |
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 | ||
3d739985 | 11 | #include <linux/cpuidle.h> |
67173ca4 | 12 | #include <linux/cpu_pm.h> |
76ee4557 | 13 | #include <linux/export.h> |
96c3a250 | 14 | #include <linux/module.h> |
35baa336 | 15 | #include <linux/platform_device.h> |
3d739985 JL |
16 | |
17 | #include <asm/proc-fns.h> | |
67173ca4 | 18 | #include <asm/suspend.h> |
06c77b3c | 19 | #include <asm/cpuidle.h> |
67173ca4 | 20 | |
277f5046 | 21 | static void (*exynos_enter_aftr)(void); |
ccd458c1 | 22 | |
7880e45e | 23 | static int exynos_enter_lowpower(struct cpuidle_device *dev, |
67173ca4 ADK |
24 | struct cpuidle_driver *drv, |
25 | int index) | |
26 | { | |
27 | int new_index = index; | |
28 | ||
118f5c1d BZ |
29 | /* AFTR can only be entered when cores other than CPU0 are offline */ |
30 | if (num_online_cpus() > 1 || dev->cpu != 0) | |
67173ca4 ADK |
31 | new_index = drv->safe_state_index; |
32 | ||
33 | if (new_index == 0) | |
06c77b3c | 34 | return arm_cpuidle_simple_enter(dev, drv, new_index); |
01601b34 TF |
35 | |
36 | exynos_enter_aftr(); | |
37 | ||
38 | return new_index; | |
67173ca4 ADK |
39 | } |
40 | ||
7880e45e DL |
41 | static struct cpuidle_driver exynos_idle_driver = { |
42 | .name = "exynos_idle", | |
53af16a1 DL |
43 | .owner = THIS_MODULE, |
44 | .states = { | |
45 | [0] = ARM_CPUIDLE_WFI_STATE, | |
46 | [1] = { | |
7880e45e | 47 | .enter = exynos_enter_lowpower, |
53af16a1 DL |
48 | .exit_latency = 300, |
49 | .target_residency = 100000, | |
50 | .flags = CPUIDLE_FLAG_TIME_VALID, | |
51 | .name = "C1", | |
52 | .desc = "ARM power down", | |
53 | }, | |
54 | }, | |
55 | .state_count = 2, | |
56 | .safe_state_index = 0, | |
57 | }; | |
58 | ||
f612a4fb | 59 | static int exynos_cpuidle_probe(struct platform_device *pdev) |
3d739985 | 60 | { |
043c86b6 | 61 | int ret; |
46bcfad7 | 62 | |
277f5046 DL |
63 | exynos_enter_aftr = (void *)(pdev->dev.platform_data); |
64 | ||
7880e45e | 65 | ret = cpuidle_register(&exynos_idle_driver, NULL); |
5db9f436 | 66 | if (ret) { |
ae7c4c87 | 67 | dev_err(&pdev->dev, "failed to register cpuidle driver\n"); |
5db9f436 | 68 | return ret; |
46bcfad7 | 69 | } |
3d739985 | 70 | |
3d739985 JL |
71 | return 0; |
72 | } | |
35baa336 BZ |
73 | |
74 | static struct platform_driver exynos_cpuidle_driver = { | |
75 | .probe = exynos_cpuidle_probe, | |
76 | .driver = { | |
77 | .name = "exynos_cpuidle", | |
78 | .owner = THIS_MODULE, | |
79 | }, | |
80 | }; | |
81 | ||
82 | module_platform_driver(exynos_cpuidle_driver); |