projects / deliverable / linux.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 | |
| 712bb69e DL |
23 | static int idle_finisher(unsigned long flags) |
| 24 | { | |
| 25 | exynos_enter_aftr(); | |
| 67173ca4 | 26 | cpu_do_idle(); |
| 20115fa8 | 27 | |
| 67173ca4 ADK |
28 | return 1; |
| 29 | } | |
| 30 | ||
| 7880e45e | 31 | static int exynos_enter_core0_aftr(struct cpuidle_device *dev, |
| 67173ca4 ADK |
32 | struct cpuidle_driver *drv, |
| 33 | int index) | |
| 34 | { | |
| 67173ca4 ADK |
35 | cpu_pm_enter(); |
| 36 | cpu_suspend(0, idle_finisher); | |
| 67173ca4 ADK |
37 | cpu_pm_exit(); |
| 38 | ||
| e978aa7d | 39 | return index; |
| 3d739985 JL |
40 | } |
| 41 | ||
| 7880e45e | 42 | static int exynos_enter_lowpower(struct cpuidle_device *dev, |
| 67173ca4 ADK |
43 | struct cpuidle_driver *drv, |
| 44 | int index) | |
| 45 | { | |
| 46 | int new_index = index; | |
| 47 | ||
| 118f5c1d BZ |
48 | /* AFTR can only be entered when cores other than CPU0 are offline */ |
| 49 | if (num_online_cpus() > 1 || dev->cpu != 0) | |
| 67173ca4 ADK |
50 | new_index = drv->safe_state_index; |
| 51 | ||
| 52 | if (new_index == 0) | |
| 06c77b3c | 53 | return arm_cpuidle_simple_enter(dev, drv, new_index); |
| 67173ca4 | 54 | else |
| 7880e45e | 55 | return exynos_enter_core0_aftr(dev, drv, new_index); |
| 67173ca4 ADK |
56 | } |
| 57 | ||
| 7880e45e DL |
58 | static struct cpuidle_driver exynos_idle_driver = { |
| 59 | .name = "exynos_idle", | |
| 53af16a1 DL |
60 | .owner = THIS_MODULE, |
| 61 | .states = { | |
| 62 | [0] = ARM_CPUIDLE_WFI_STATE, | |
| 63 | [1] = { | |
| 7880e45e | 64 | .enter = exynos_enter_lowpower, |
| 53af16a1 DL |
65 | .exit_latency = 300, |
| 66 | .target_residency = 100000, | |
| 67 | .flags = CPUIDLE_FLAG_TIME_VALID, | |
| 68 | .name = "C1", | |
| 69 | .desc = "ARM power down", | |
| 70 | }, | |
| 71 | }, | |
| 72 | .state_count = 2, | |
| 73 | .safe_state_index = 0, | |
| 74 | }; | |
| 75 | ||
| f612a4fb | 76 | static int exynos_cpuidle_probe(struct platform_device *pdev) |
| 3d739985 | 77 | { |
| 043c86b6 | 78 | int ret; |
| 46bcfad7 | 79 | |
| 277f5046 DL |
80 | exynos_enter_aftr = (void *)(pdev->dev.platform_data); |
| 81 | ||
| 7880e45e | 82 | ret = cpuidle_register(&exynos_idle_driver, NULL); |
| 5db9f436 | 83 | if (ret) { |
| ae7c4c87 | 84 | dev_err(&pdev->dev, "failed to register cpuidle driver\n"); |
| 5db9f436 | 85 | return ret; |
| 46bcfad7 | 86 | } |
| 3d739985 | 87 | |
| 3d739985 JL |
88 | return 0; |
| 89 | } | |
| 35baa336 BZ |
90 | |
| 91 | static struct platform_driver exynos_cpuidle_driver = { | |
| 92 | .probe = exynos_cpuidle_probe, | |
| 93 | .driver = { | |
| 94 | .name = "exynos_cpuidle", | |
| 95 | .owner = THIS_MODULE, | |
| 96 | }, | |
| 97 | }; | |
| 98 | ||
| 99 | module_platform_driver(exynos_cpuidle_driver); |