114 lines
3.1 KiB
C
114 lines
3.1 KiB
C
|
/*
|
||
|
|
* arch/sh/kernel/cpu/shmobile/cpuidle.c
|
||
|
|
*
|
||
|
|
* Cpuidle support code for SuperH Mobile
|
||
|
|
*
|
||
|
|
* Copyright (C) 2009 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/init.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/io.h>
|
||
|
|
#include <linux/suspend.h>
|
||
|
|
#include <linux/cpuidle.h>
|
||
|
|
#include <asm/suspend.h>
|
||
|
|
#include <asm/uaccess.h>
|
||
|
|
#include <asm/hwblk.h>
|
||
|
|
|
||
|
|
static unsigned long cpuidle_mode[] = {
|
||
|
|
SUSP_SH_SLEEP, /* regular sleep mode */
|
||
|
|
SUSP_SH_SLEEP | SUSP_SH_SF, /* sleep mode + self refresh */
|
||
|
|
SUSP_SH_STANDBY | SUSP_SH_SF, /* software standby mode + self refresh */
|
||
|
|
};
|
||
|
|
|
||
|
|
static int cpuidle_sleep_enter(struct cpuidle_device *dev,
|
||
|
|
struct cpuidle_state *state)
|
||
|
|
{
|
||
|
|
unsigned long allowed_mode = arch_hwblk_sleep_mode();
|
||
|
|
ktime_t before, after;
|
||
|
|
int requested_state = state - &dev->states[0];
|
||
|
|
int allowed_state;
|
||
|
|
int k;
|
||
|
|
|
||
|
|
/* convert allowed mode to allowed state */
|
||
|
|
for (k = ARRAY_SIZE(cpuidle_mode) - 1; k > 0; k--)
|
||
|
|
if (cpuidle_mode[k] == allowed_mode)
|
||
|
|
break;
|
||
|
|
|
||
|
|
allowed_state = k;
|
||
|
|
|
||
|
|
/* take the following into account for sleep mode selection:
|
||
|
|
* - allowed_state: best mode allowed by hardware (clock deps)
|
||
|
|
* - requested_state: best mode allowed by software (latencies)
|
||
|
|
*/
|
||
|
|
k = min_t(int, allowed_state, requested_state);
|
||
|
|
|
||
|
|
dev->last_state = &dev->states[k];
|
||
|
|
before = ktime_get();
|
||
|
|
sh_mobile_call_standby(cpuidle_mode[k]);
|
||
|
|
after = ktime_get();
|
||
|
|
return ktime_to_ns(ktime_sub(after, before)) >> 10;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct cpuidle_device cpuidle_dev;
|
||
|
|
static struct cpuidle_driver cpuidle_driver = {
|
||
|
|
.name = "sh_idle",
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
};
|
||
|
|
|
||
|
|
void sh_mobile_setup_cpuidle(void)
|
||
|
|
{
|
||
|
|
struct cpuidle_device *dev = &cpuidle_dev;
|
||
|
|
struct cpuidle_state *state;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
cpuidle_register_driver(&cpuidle_driver);
|
||
|
|
|
||
|
|
for (i = 0; i < CPUIDLE_STATE_MAX; i++) {
|
||
|
|
dev->states[i].name[0] = '\0';
|
||
|
|
dev->states[i].desc[0] = '\0';
|
||
|
|
}
|
||
|
|
|
||
|
|
i = CPUIDLE_DRIVER_STATE_START;
|
||
|
|
|
||
|
|
state = &dev->states[i++];
|
||
|
|
snprintf(state->name, CPUIDLE_NAME_LEN, "C0");
|
||
|
|
strncpy(state->desc, "SuperH Sleep Mode", CPUIDLE_DESC_LEN);
|
||
|
|
state->exit_latency = 1;
|
||
|
|
state->target_residency = 1 * 2;
|
||
|
|
state->power_usage = 3;
|
||
|
|
state->flags = 0;
|
||
|
|
state->flags |= CPUIDLE_FLAG_SHALLOW;
|
||
|
|
state->flags |= CPUIDLE_FLAG_TIME_VALID;
|
||
|
|
state->enter = cpuidle_sleep_enter;
|
||
|
|
|
||
|
|
dev->safe_state = state;
|
||
|
|
|
||
|
|
state = &dev->states[i++];
|
||
|
|
snprintf(state->name, CPUIDLE_NAME_LEN, "C1");
|
||
|
|
strncpy(state->desc, "SuperH Sleep Mode [SF]", CPUIDLE_DESC_LEN);
|
||
|
|
state->exit_latency = 100;
|
||
|
|
state->target_residency = 1 * 2;
|
||
|
|
state->power_usage = 1;
|
||
|
|
state->flags = 0;
|
||
|
|
state->flags |= CPUIDLE_FLAG_TIME_VALID;
|
||
|
|
state->enter = cpuidle_sleep_enter;
|
||
|
|
|
||
|
|
state = &dev->states[i++];
|
||
|
|
snprintf(state->name, CPUIDLE_NAME_LEN, "C2");
|
||
|
|
strncpy(state->desc, "SuperH Mobile Standby Mode [SF]", CPUIDLE_DESC_LEN);
|
||
|
|
state->exit_latency = 2300;
|
||
|
|
state->target_residency = 1 * 2;
|
||
|
|
state->power_usage = 1;
|
||
|
|
state->flags = 0;
|
||
|
|
state->flags |= CPUIDLE_FLAG_TIME_VALID;
|
||
|
|
state->enter = cpuidle_sleep_enter;
|
||
|
|
|
||
|
|
dev->state_count = i;
|
||
|
|
|
||
|
|
cpuidle_register_device(dev);
|
||
|
|
}
|