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Kukjin Kim
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May 16, 2011
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--- | ||
refs/heads/master: 4b42120df72aeebd3967c952804cb1af53b91cc5 | ||
refs/heads/master: bd6356bdafc853201168f718f0059fbe11191461 |
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/* linux/arch/arm/mach-exynos4/cpuidle.c | ||
* | ||
* Copyright (c) 2011 Samsung Electronics Co., Ltd. | ||
* http://www.samsung.com | ||
* | ||
* This program is free software; you can redistribute it and/or modify | ||
* it under the terms of the GNU General Public License version 2 as | ||
* published by the Free Software Foundation. | ||
*/ | ||
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#include <linux/kernel.h> | ||
#include <linux/init.h> | ||
#include <linux/cpuidle.h> | ||
#include <linux/io.h> | ||
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#include <asm/proc-fns.h> | ||
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static int exynos4_enter_idle(struct cpuidle_device *dev, | ||
struct cpuidle_state *state); | ||
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static struct cpuidle_state exynos4_cpuidle_set[] = { | ||
[0] = { | ||
.enter = exynos4_enter_idle, | ||
.exit_latency = 1, | ||
.target_residency = 100000, | ||
.flags = CPUIDLE_FLAG_TIME_VALID, | ||
.name = "IDLE", | ||
.desc = "ARM clock gating(WFI)", | ||
}, | ||
}; | ||
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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 = { | ||
.name = "exynos4_idle", | ||
.owner = THIS_MODULE, | ||
}; | ||
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static int exynos4_enter_idle(struct cpuidle_device *dev, | ||
struct cpuidle_state *state) | ||
{ | ||
struct timeval before, after; | ||
int idle_time; | ||
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local_irq_disable(); | ||
do_gettimeofday(&before); | ||
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cpu_do_idle(); | ||
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do_gettimeofday(&after); | ||
local_irq_enable(); | ||
idle_time = (after.tv_sec - before.tv_sec) * USEC_PER_SEC + | ||
(after.tv_usec - before.tv_usec); | ||
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return idle_time; | ||
} | ||
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static int __init exynos4_init_cpuidle(void) | ||
{ | ||
int i, max_cpuidle_state, cpu_id; | ||
struct cpuidle_device *device; | ||
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cpuidle_register_driver(&exynos4_idle_driver); | ||
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for_each_cpu(cpu_id, cpu_online_mask) { | ||
device = &per_cpu(exynos4_cpuidle_device, cpu_id); | ||
device->cpu = cpu_id; | ||
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device->state_count = (sizeof(exynos4_cpuidle_set) / | ||
sizeof(struct cpuidle_state)); | ||
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max_cpuidle_state = device->state_count; | ||
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for (i = 0; i < max_cpuidle_state; i++) { | ||
memcpy(&device->states[i], &exynos4_cpuidle_set[i], | ||
sizeof(struct cpuidle_state)); | ||
} | ||
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if (cpuidle_register_device(device)) { | ||
printk(KERN_ERR "CPUidle register device failed\n,"); | ||
return -EIO; | ||
} | ||
} | ||
return 0; | ||
} | ||
device_initcall(exynos4_init_cpuidle); |
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