1 /* linux/arch/arm/mach-exynos/cpuidle.c
3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com
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.
11 #include <linux/cpuidle.h>
12 #include <linux/cpu_pm.h>
13 #include <linux/export.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
17 #include <asm/proc-fns.h>
18 #include <asm/suspend.h>
19 #include <asm/cpuidle.h>
21 static void (*exynos_enter_aftr)(void);
23 static int exynos_enter_lowpower(struct cpuidle_device *dev,
24 struct cpuidle_driver *drv,
27 int new_index = index;
29 /* AFTR can only be entered when cores other than CPU0 are offline */
30 if (num_online_cpus() > 1 || dev->cpu != 0)
31 new_index = drv->safe_state_index;
34 return arm_cpuidle_simple_enter(dev, drv, new_index);
41 static struct cpuidle_driver exynos_idle_driver = {
42 .name = "exynos_idle",
45 [0] = ARM_CPUIDLE_WFI_STATE,
47 .enter = exynos_enter_lowpower,
49 .target_residency = 100000,
51 .desc = "ARM power down",
55 .safe_state_index = 0,
58 static int exynos_cpuidle_probe(struct platform_device *pdev)
62 exynos_enter_aftr = (void *)(pdev->dev.platform_data);
64 ret = cpuidle_register(&exynos_idle_driver, NULL);
66 dev_err(&pdev->dev, "failed to register cpuidle driver\n");
73 static struct platform_driver exynos_cpuidle_driver = {
74 .probe = exynos_cpuidle_probe,
76 .name = "exynos_cpuidle",
81 module_platform_driver(exynos_cpuidle_driver);