mirror of https://gitee.com/openkylin/linux.git
162 lines
3.4 KiB
C
162 lines
3.4 KiB
C
/*
|
|
* MPIC timer wakeup driver
|
|
*
|
|
* Copyright 2013 Freescale Semiconductor, Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/module.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/device.h>
|
|
|
|
#include <asm/mpic_timer.h>
|
|
#include <asm/mpic.h>
|
|
|
|
struct fsl_mpic_timer_wakeup {
|
|
struct mpic_timer *timer;
|
|
struct work_struct free_work;
|
|
};
|
|
|
|
static struct fsl_mpic_timer_wakeup *fsl_wakeup;
|
|
static DEFINE_MUTEX(sysfs_lock);
|
|
|
|
static void fsl_free_resource(struct work_struct *ws)
|
|
{
|
|
struct fsl_mpic_timer_wakeup *wakeup =
|
|
container_of(ws, struct fsl_mpic_timer_wakeup, free_work);
|
|
|
|
mutex_lock(&sysfs_lock);
|
|
|
|
if (wakeup->timer) {
|
|
disable_irq_wake(wakeup->timer->irq);
|
|
mpic_free_timer(wakeup->timer);
|
|
}
|
|
|
|
wakeup->timer = NULL;
|
|
mutex_unlock(&sysfs_lock);
|
|
}
|
|
|
|
static irqreturn_t fsl_mpic_timer_irq(int irq, void *dev_id)
|
|
{
|
|
struct fsl_mpic_timer_wakeup *wakeup = dev_id;
|
|
|
|
schedule_work(&wakeup->free_work);
|
|
|
|
return wakeup->timer ? IRQ_HANDLED : IRQ_NONE;
|
|
}
|
|
|
|
static ssize_t fsl_timer_wakeup_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct timeval interval;
|
|
int val = 0;
|
|
|
|
mutex_lock(&sysfs_lock);
|
|
if (fsl_wakeup->timer) {
|
|
mpic_get_remain_time(fsl_wakeup->timer, &interval);
|
|
val = interval.tv_sec + 1;
|
|
}
|
|
mutex_unlock(&sysfs_lock);
|
|
|
|
return sprintf(buf, "%d\n", val);
|
|
}
|
|
|
|
static ssize_t fsl_timer_wakeup_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t count)
|
|
{
|
|
struct timeval interval;
|
|
int ret;
|
|
|
|
interval.tv_usec = 0;
|
|
if (kstrtol(buf, 0, &interval.tv_sec))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&sysfs_lock);
|
|
|
|
if (fsl_wakeup->timer) {
|
|
disable_irq_wake(fsl_wakeup->timer->irq);
|
|
mpic_free_timer(fsl_wakeup->timer);
|
|
fsl_wakeup->timer = NULL;
|
|
}
|
|
|
|
if (!interval.tv_sec) {
|
|
mutex_unlock(&sysfs_lock);
|
|
return count;
|
|
}
|
|
|
|
fsl_wakeup->timer = mpic_request_timer(fsl_mpic_timer_irq,
|
|
fsl_wakeup, &interval);
|
|
if (!fsl_wakeup->timer) {
|
|
mutex_unlock(&sysfs_lock);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = enable_irq_wake(fsl_wakeup->timer->irq);
|
|
if (ret) {
|
|
mpic_free_timer(fsl_wakeup->timer);
|
|
fsl_wakeup->timer = NULL;
|
|
mutex_unlock(&sysfs_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
mpic_start_timer(fsl_wakeup->timer);
|
|
|
|
mutex_unlock(&sysfs_lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static struct device_attribute mpic_attributes = __ATTR(timer_wakeup, 0644,
|
|
fsl_timer_wakeup_show, fsl_timer_wakeup_store);
|
|
|
|
static int __init fsl_wakeup_sys_init(void)
|
|
{
|
|
int ret;
|
|
|
|
fsl_wakeup = kzalloc(sizeof(struct fsl_mpic_timer_wakeup), GFP_KERNEL);
|
|
if (!fsl_wakeup)
|
|
return -ENOMEM;
|
|
|
|
INIT_WORK(&fsl_wakeup->free_work, fsl_free_resource);
|
|
|
|
ret = device_create_file(mpic_subsys.dev_root, &mpic_attributes);
|
|
if (ret)
|
|
kfree(fsl_wakeup);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit fsl_wakeup_sys_exit(void)
|
|
{
|
|
device_remove_file(mpic_subsys.dev_root, &mpic_attributes);
|
|
|
|
mutex_lock(&sysfs_lock);
|
|
|
|
if (fsl_wakeup->timer) {
|
|
disable_irq_wake(fsl_wakeup->timer->irq);
|
|
mpic_free_timer(fsl_wakeup->timer);
|
|
}
|
|
|
|
kfree(fsl_wakeup);
|
|
|
|
mutex_unlock(&sysfs_lock);
|
|
}
|
|
|
|
module_init(fsl_wakeup_sys_init);
|
|
module_exit(fsl_wakeup_sys_exit);
|
|
|
|
MODULE_DESCRIPTION("Freescale MPIC global timer wakeup driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Wang Dongsheng <dongsheng.wang@freescale.com>");
|