87 lines
1.8 KiB
C
87 lines
1.8 KiB
C
/*
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* CPUIdle support code for SH-Mobile ARM
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*
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* Copyright (C) 2011 Magnus Damm
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/pm.h>
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#include <linux/cpuidle.h>
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#include <linux/suspend.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <asm/system.h>
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#include <asm/io.h>
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static void shmobile_enter_wfi(void)
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{
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cpu_do_idle();
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}
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void (*shmobile_cpuidle_modes[CPUIDLE_STATE_MAX])(void) = {
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shmobile_enter_wfi, /* regular sleep mode */
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};
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static int shmobile_cpuidle_enter(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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ktime_t before, after;
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before = ktime_get();
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local_irq_disable();
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local_fiq_disable();
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shmobile_cpuidle_modes[index]();
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local_irq_enable();
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local_fiq_enable();
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after = ktime_get();
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dev->last_residency = ktime_to_ns(ktime_sub(after, before)) >> 10;
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return index;
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}
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static struct cpuidle_device shmobile_cpuidle_dev;
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static struct cpuidle_driver shmobile_cpuidle_driver = {
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.name = "shmobile_cpuidle",
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.owner = THIS_MODULE,
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.states[0] = {
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.name = "C1",
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.desc = "WFI",
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.exit_latency = 1,
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.target_residency = 1 * 2,
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.flags = CPUIDLE_FLAG_TIME_VALID,
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},
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.safe_state_index = 0, /* C1 */
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.state_count = 1,
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};
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void (*shmobile_cpuidle_setup)(struct cpuidle_driver *drv);
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static int shmobile_cpuidle_init(void)
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{
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struct cpuidle_device *dev = &shmobile_cpuidle_dev;
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struct cpuidle_driver *drv = &shmobile_cpuidle_driver;
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int i;
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for (i = 0; i < CPUIDLE_STATE_MAX; i++)
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drv->states[i].enter = shmobile_cpuidle_enter;
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if (shmobile_cpuidle_setup)
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shmobile_cpuidle_setup(drv);
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cpuidle_register_driver(drv);
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dev->state_count = drv->state_count;
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cpuidle_register_device(dev);
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return 0;
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}
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late_initcall(shmobile_cpuidle_init);
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