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/*
* arch/arm/mach-s5pv210/cpuidle.c
*
* Copyright (c) Samsung Electronics Co. Ltd
*
* CPU idle driver for S5PV210
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/cpuidle.h>
#include <linux/io.h>
#include <asm/proc-fns.h>
#include <asm/cacheflush.h>
#include <mach/map.h>
#include <mach/regs-irq.h>
#include <mach/regs-clock.h>
#include <plat/pm.h>
#include <plat/devs.h>
#include <mach/dma.h>
#include <mach/regs-gpio.h>
#define S5PC110_MAX_STATES 1
static void s5p_enter_idle(void)
{
unsigned long tmp;
tmp = __raw_readl(S5P_IDLE_CFG);
tmp &= ~((3<<30)|(3<<28)|(1<<0));
tmp |= ((2<<30)|(2<<28));
__raw_writel(tmp, S5P_IDLE_CFG);
tmp = __raw_readl(S5P_PWR_CFG);
tmp &= S5P_CFG_WFI_CLEAN;
__raw_writel(tmp, S5P_PWR_CFG);
cpu_do_idle();
}
/* Actual code that puts the SoC in different idle states */
static int s5p_enter_idle_normal(struct cpuidle_device *dev,
struct cpuidle_state *state)
{
struct timeval before, after;
int idle_time;
local_irq_disable();
do_gettimeofday(&before);
s5p_enter_idle();
do_gettimeofday(&after);
local_irq_enable();
idle_time = (after.tv_sec - before.tv_sec) * USEC_PER_SEC +
(after.tv_usec - before.tv_usec);
return idle_time;
}
static DEFINE_PER_CPU(struct cpuidle_device, s5p_cpuidle_device);
static struct cpuidle_driver s5p_idle_driver = {
.name = "s5p_idle",
.owner = THIS_MODULE,
};
/* Initialize CPU idle by registering the idle states */
static int s5p_init_cpuidle(void)
{
struct cpuidle_device *device;
cpuidle_register_driver(&s5p_idle_driver);
device = &per_cpu(s5p_cpuidle_device, smp_processor_id());
device->state_count = 1;
/* Wait for interrupt state */
device->states[0].enter = s5p_enter_idle_normal;
device->states[0].exit_latency = 1; /* uS */
device->states[0].target_residency = 10000;
device->states[0].flags = CPUIDLE_FLAG_TIME_VALID;
strcpy(device->states[0].name, "IDLE");
strcpy(device->states[0].desc, "ARM clock gating - WFI");
if (cpuidle_register_device(device)) {
printk(KERN_ERR "s5p_init_cpuidle: Failed registering\n");
return -EIO;
}
return 0;
}
device_initcall(s5p_init_cpuidle);
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