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 | ||
11 | #include <linux/kernel.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/cpuidle.h> | |
67173ca4 | 14 | #include <linux/cpu_pm.h> |
3d739985 | 15 | #include <linux/io.h> |
76ee4557 | 16 | #include <linux/export.h> |
96c3a250 | 17 | #include <linux/module.h> |
76ee4557 | 18 | #include <linux/time.h> |
35baa336 | 19 | #include <linux/platform_device.h> |
3d739985 JL |
20 | |
21 | #include <asm/proc-fns.h> | |
67173ca4 ADK |
22 | #include <asm/suspend.h> |
23 | #include <asm/unified.h> | |
06c77b3c | 24 | #include <asm/cpuidle.h> |
67173ca4 ADK |
25 | |
26 | #include <plat/cpu.h> | |
89693016 | 27 | #include <plat/pm.h> |
67173ca4 | 28 | |
b5fd1300 KK |
29 | #include <mach/map.h> |
30 | ||
ccd458c1 KK |
31 | #include "common.h" |
32 | ||
712bb69e DL |
33 | static int idle_finisher(unsigned long flags) |
34 | { | |
35 | exynos_enter_aftr(); | |
67173ca4 | 36 | cpu_do_idle(); |
20115fa8 | 37 | |
67173ca4 ADK |
38 | return 1; |
39 | } | |
40 | ||
7880e45e | 41 | static int exynos_enter_core0_aftr(struct cpuidle_device *dev, |
67173ca4 ADK |
42 | struct cpuidle_driver *drv, |
43 | int index) | |
44 | { | |
67173ca4 ADK |
45 | cpu_pm_enter(); |
46 | cpu_suspend(0, idle_finisher); | |
67173ca4 ADK |
47 | cpu_pm_exit(); |
48 | ||
e978aa7d | 49 | return index; |
3d739985 JL |
50 | } |
51 | ||
7880e45e | 52 | static int exynos_enter_lowpower(struct cpuidle_device *dev, |
67173ca4 ADK |
53 | struct cpuidle_driver *drv, |
54 | int index) | |
55 | { | |
56 | int new_index = index; | |
57 | ||
118f5c1d BZ |
58 | /* AFTR can only be entered when cores other than CPU0 are offline */ |
59 | if (num_online_cpus() > 1 || dev->cpu != 0) | |
67173ca4 ADK |
60 | new_index = drv->safe_state_index; |
61 | ||
62 | if (new_index == 0) | |
06c77b3c | 63 | return arm_cpuidle_simple_enter(dev, drv, new_index); |
67173ca4 | 64 | else |
7880e45e | 65 | return exynos_enter_core0_aftr(dev, drv, new_index); |
67173ca4 ADK |
66 | } |
67 | ||
7880e45e DL |
68 | static struct cpuidle_driver exynos_idle_driver = { |
69 | .name = "exynos_idle", | |
53af16a1 DL |
70 | .owner = THIS_MODULE, |
71 | .states = { | |
72 | [0] = ARM_CPUIDLE_WFI_STATE, | |
73 | [1] = { | |
7880e45e | 74 | .enter = exynos_enter_lowpower, |
53af16a1 DL |
75 | .exit_latency = 300, |
76 | .target_residency = 100000, | |
77 | .flags = CPUIDLE_FLAG_TIME_VALID, | |
78 | .name = "C1", | |
79 | .desc = "ARM power down", | |
80 | }, | |
81 | }, | |
82 | .state_count = 2, | |
83 | .safe_state_index = 0, | |
84 | }; | |
85 | ||
f612a4fb | 86 | static int exynos_cpuidle_probe(struct platform_device *pdev) |
3d739985 | 87 | { |
043c86b6 | 88 | int ret; |
46bcfad7 | 89 | |
7880e45e | 90 | ret = cpuidle_register(&exynos_idle_driver, NULL); |
5db9f436 | 91 | if (ret) { |
ae7c4c87 | 92 | dev_err(&pdev->dev, "failed to register cpuidle driver\n"); |
5db9f436 | 93 | return ret; |
46bcfad7 | 94 | } |
3d739985 | 95 | |
3d739985 JL |
96 | return 0; |
97 | } | |
35baa336 BZ |
98 | |
99 | static struct platform_driver exynos_cpuidle_driver = { | |
100 | .probe = exynos_cpuidle_probe, | |
101 | .driver = { | |
102 | .name = "exynos_cpuidle", | |
103 | .owner = THIS_MODULE, | |
104 | }, | |
105 | }; | |
106 | ||
107 | module_platform_driver(exynos_cpuidle_driver); |