projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 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); |