0ebc13e2a2
The code to initiate and exit the powerdown sequence is the same in pm.c and cpuidle.c. Let's split the common part in the pm.c and reuse it from the cpu_pm notifier. That is one more step forward to make the cpuidle driver arch indenpendant. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Reviewed-by: Tomasz Figa <t.figa@samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
108 lines
2.3 KiB
C
108 lines
2.3 KiB
C
/* linux/arch/arm/mach-exynos/cpuidle.c
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*
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* Copyright (c) 2011 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/cpuidle.h>
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#include <linux/cpu_pm.h>
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#include <linux/io.h>
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#include <linux/export.h>
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#include <linux/module.h>
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#include <linux/time.h>
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#include <linux/platform_device.h>
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#include <asm/proc-fns.h>
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#include <asm/suspend.h>
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#include <asm/unified.h>
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#include <asm/cpuidle.h>
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#include <plat/cpu.h>
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#include <plat/pm.h>
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#include <mach/map.h>
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#include "common.h"
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static int idle_finisher(unsigned long flags)
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{
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exynos_enter_aftr();
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cpu_do_idle();
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return 1;
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}
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static int exynos_enter_core0_aftr(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int index)
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{
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cpu_pm_enter();
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cpu_suspend(0, idle_finisher);
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cpu_pm_exit();
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return index;
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}
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static int exynos_enter_lowpower(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int index)
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{
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int new_index = index;
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/* AFTR can only be entered when cores other than CPU0 are offline */
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if (num_online_cpus() > 1 || dev->cpu != 0)
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new_index = drv->safe_state_index;
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if (new_index == 0)
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return arm_cpuidle_simple_enter(dev, drv, new_index);
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else
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return exynos_enter_core0_aftr(dev, drv, new_index);
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}
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static struct cpuidle_driver exynos_idle_driver = {
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.name = "exynos_idle",
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.owner = THIS_MODULE,
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.states = {
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[0] = ARM_CPUIDLE_WFI_STATE,
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[1] = {
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.enter = exynos_enter_lowpower,
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.exit_latency = 300,
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.target_residency = 100000,
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.flags = CPUIDLE_FLAG_TIME_VALID,
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.name = "C1",
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.desc = "ARM power down",
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},
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},
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.state_count = 2,
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.safe_state_index = 0,
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};
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static int exynos_cpuidle_probe(struct platform_device *pdev)
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{
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int ret;
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ret = cpuidle_register(&exynos_idle_driver, NULL);
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if (ret) {
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dev_err(&pdev->dev, "failed to register cpuidle driver\n");
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return ret;
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}
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return 0;
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}
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static struct platform_driver exynos_cpuidle_driver = {
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.probe = exynos_cpuidle_probe,
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.driver = {
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.name = "exynos_cpuidle",
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.owner = THIS_MODULE,
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},
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};
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module_platform_driver(exynos_cpuidle_driver);
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