mirror of
https://github.com/torvalds/linux.git
synced 2024-12-29 06:12:08 +00:00
93 lines
2.1 KiB
C
93 lines
2.1 KiB
C
|
/*
|
||
|
|
* CPUIdle support code for SH-Mobile ARM
|
||
|
|
*
|
||
|
|
* Copyright (C) 2011 Magnus Damm
|
||
|
|
*
|
||
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
||
|
|
* License. See the file "COPYING" in the main directory of this archive
|
||
|
|
* for more details.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/pm.h>
|
||
|
|
#include <linux/cpuidle.h>
|
||
|
|
#include <linux/suspend.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/err.h>
|
||
|
|
#include <asm/system.h>
|
||
|
|
#include <asm/io.h>
|
||
|
|
|
||
|
|
static void shmobile_enter_wfi(void)
|
||
|
|
{
|
||
|
|
cpu_do_idle();
|
||
|
|
}
|
||
|
|
|
||
|
|
void (*shmobile_cpuidle_modes[CPUIDLE_STATE_MAX])(void) = {
|
||
|
|
shmobile_enter_wfi, /* regular sleep mode */
|
||
|
|
};
|
||
|
|
|
||
|
|
static int shmobile_cpuidle_enter(struct cpuidle_device *dev,
|
||
|
|
struct cpuidle_state *state)
|
||
|
|
{
|
||
|
|
ktime_t before, after;
|
||
|
|
int requested_state = state - &dev->states[0];
|
||
|
|
|
||
|
|
dev->last_state = &dev->states[requested_state];
|
||
|
|
before = ktime_get();
|
||
|
|
|
||
|
|
local_irq_disable();
|
||
|
|
local_fiq_disable();
|
||
|
|
|
||
|
|
shmobile_cpuidle_modes[requested_state]();
|
||
|
|
|
||
|
|
local_irq_enable();
|
||
|
|
local_fiq_enable();
|
||
|
|
|
||
|
|
after = ktime_get();
|
||
|
|
return ktime_to_ns(ktime_sub(after, before)) >> 10;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct cpuidle_device shmobile_cpuidle_dev;
|
||
|
|
static struct cpuidle_driver shmobile_cpuidle_driver = {
|
||
|
|
.name = "shmobile_cpuidle",
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
};
|
||
|
|
|
||
|
|
void (*shmobile_cpuidle_setup)(struct cpuidle_device *dev);
|
||
|
|
|
||
|
|
static int shmobile_cpuidle_init(void)
|
||
|
|
{
|
||
|
|
struct cpuidle_device *dev = &shmobile_cpuidle_dev;
|
||
|
|
struct cpuidle_state *state;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
cpuidle_register_driver(&shmobile_cpuidle_driver);
|
||
|
|
|
||
|
|
for (i = 0; i < CPUIDLE_STATE_MAX; i++) {
|
||
|
|
dev->states[i].name[0] = '\0';
|
||
|
|
dev->states[i].desc[0] = '\0';
|
||
|
|
dev->states[i].enter = shmobile_cpuidle_enter;
|
||
|
|
}
|
||
|
|
|
||
|
|
i = CPUIDLE_DRIVER_STATE_START;
|
||
|
|
|
||
|
|
state = &dev->states[i++];
|
||
|
|
snprintf(state->name, CPUIDLE_NAME_LEN, "C1");
|
||
|
|
strncpy(state->desc, "WFI", CPUIDLE_DESC_LEN);
|
||
|
|
state->exit_latency = 1;
|
||
|
|
state->target_residency = 1 * 2;
|
||
|
|
state->power_usage = 3;
|
||
|
|
state->flags = 0;
|
||
|
|
state->flags |= CPUIDLE_FLAG_TIME_VALID;
|
||
|
|
|
||
|
|
dev->safe_state = state;
|
||
|
|
dev->state_count = i;
|
||
|
|
|
||
|
|
if (shmobile_cpuidle_setup)
|
||
|
|
shmobile_cpuidle_setup(dev);
|
||
|
|
|
||
|
|
cpuidle_register_device(dev);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
late_initcall(shmobile_cpuidle_init);
|