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 idle_finisher(unsigned long flags)
31 static int exynos_enter_core0_aftr(struct cpuidle_device *dev,
32 struct cpuidle_driver *drv,
36 cpu_suspend(0, idle_finisher);
42 static int exynos_enter_lowpower(struct cpuidle_device *dev,
43 struct cpuidle_driver *drv,
46 int new_index = index;
48 /* AFTR can only be entered when cores other than CPU0 are offline */
49 if (num_online_cpus() > 1 || dev->cpu != 0)
50 new_index = drv->safe_state_index;
53 return arm_cpuidle_simple_enter(dev, drv, new_index);
55 return exynos_enter_core0_aftr(dev, drv, new_index);
58 static struct cpuidle_driver exynos_idle_driver = {
59 .name = "exynos_idle",
62 [0] = ARM_CPUIDLE_WFI_STATE,
64 .enter = exynos_enter_lowpower,
66 .target_residency = 100000,
67 .flags = CPUIDLE_FLAG_TIME_VALID,
69 .desc = "ARM power down",
73 .safe_state_index = 0,
76 static int exynos_cpuidle_probe(struct platform_device *pdev)
80 exynos_enter_aftr = (void *)(pdev->dev.platform_data);
82 ret = cpuidle_register(&exynos_idle_driver, NULL);
84 dev_err(&pdev->dev, "failed to register cpuidle driver\n");
91 static struct platform_driver exynos_cpuidle_driver = {
92 .probe = exynos_cpuidle_probe,
94 .name = "exynos_cpuidle",
99 module_platform_driver(exynos_cpuidle_driver);