93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
/* linux/arch/arm/mach-exynos4/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/io.h>
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#include <linux/export.h>
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#include <linux/time.h>
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#include <asm/proc-fns.h>
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static int exynos4_enter_idle(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int index);
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static struct cpuidle_state exynos4_cpuidle_set[] = {
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[0] = {
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.enter = exynos4_enter_idle,
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.exit_latency = 1,
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.target_residency = 100000,
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.flags = CPUIDLE_FLAG_TIME_VALID,
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.name = "IDLE",
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.desc = "ARM clock gating(WFI)",
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},
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};
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static DEFINE_PER_CPU(struct cpuidle_device, exynos4_cpuidle_device);
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static struct cpuidle_driver exynos4_idle_driver = {
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.name = "exynos4_idle",
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.owner = THIS_MODULE,
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};
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static int exynos4_enter_idle(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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struct timeval before, after;
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int idle_time;
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local_irq_disable();
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do_gettimeofday(&before);
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cpu_do_idle();
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do_gettimeofday(&after);
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local_irq_enable();
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idle_time = (after.tv_sec - before.tv_sec) * USEC_PER_SEC +
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(after.tv_usec - before.tv_usec);
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dev->last_residency = idle_time;
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return index;
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}
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static int __init exynos4_init_cpuidle(void)
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{
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int i, max_cpuidle_state, cpu_id;
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struct cpuidle_device *device;
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struct cpuidle_driver *drv = &exynos4_idle_driver;
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/* Setup cpuidle driver */
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drv->state_count = (sizeof(exynos4_cpuidle_set) /
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sizeof(struct cpuidle_state));
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max_cpuidle_state = drv->state_count;
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for (i = 0; i < max_cpuidle_state; i++) {
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memcpy(&drv->states[i], &exynos4_cpuidle_set[i],
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sizeof(struct cpuidle_state));
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}
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cpuidle_register_driver(&exynos4_idle_driver);
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for_each_cpu(cpu_id, cpu_online_mask) {
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device = &per_cpu(exynos4_cpuidle_device, cpu_id);
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device->cpu = cpu_id;
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device->state_count = drv->state_count;
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if (cpuidle_register_device(device)) {
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printk(KERN_ERR "CPUidle register device failed\n,");
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return -EIO;
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}
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}
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return 0;
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}
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device_initcall(exynos4_init_cpuidle);
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