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/*
* Copyright (C) 2010-2012 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
* 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.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <gsl.h>
#include <linux/timer.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/hardirq.h>
#include <linux/semaphore.h>
typedef struct _gsl_autogate_t {
struct timer_list timer;
spinlock_t lock;
int active;
/* pending indicate the timer has been fired but clock not yet disabled. */
int pending;
int timeout;
gsl_device_t *dev;
struct work_struct dis_task;
} gsl_autogate_t;
static gsl_autogate_t *g_autogate[2];
static DEFINE_MUTEX(sem_dev);
#define KGSL_DEVICE_IDLE_TIMEOUT 2000 /* unit ms */
static void clk_disable_task(struct work_struct *work)
{
gsl_autogate_t *autogate;
autogate = container_of(work, gsl_autogate_t, dis_task);
if (autogate->dev->ftbl.device_idle)
autogate->dev->ftbl.device_idle(autogate->dev, GSL_TIMEOUT_DEFAULT);
kgsl_clock(autogate->dev->id, 0);
autogate->pending = 0;
}
static int _kgsl_device_active(gsl_device_t *dev, int all)
{
unsigned long flags;
int to_active = 0;
gsl_autogate_t *autogate = dev->autogate;
if (!autogate) {
printk(KERN_ERR "%s: autogate has exited!\n", __func__);
return 0;
}
// printk(KERN_ERR "%s:%d id %d active %d\n", __func__, __LINE__, dev->id, autogate->active);
spin_lock_irqsave(&autogate->lock, flags);
if (in_interrupt()) {
if (!autogate->active && !autogate->pending)
BUG();
} else {
to_active = !autogate->active;
autogate->active = 1;
}
mod_timer(&autogate->timer, jiffies + msecs_to_jiffies(autogate->timeout));
spin_unlock_irqrestore(&autogate->lock, flags);
if (to_active)
kgsl_clock(autogate->dev->id, 1);
if (to_active && all) {
int index;
index = autogate->dev->id == GSL_DEVICE_G12 ? GSL_DEVICE_YAMATO - 1 :
GSL_DEVICE_G12 - 1;
mutex_lock(&sem_dev);
if (g_autogate[index])
_kgsl_device_active(g_autogate[index]->dev, 0);
mutex_unlock(&sem_dev);
}
return 0;
}
int kgsl_device_active(gsl_device_t *dev)
{
return _kgsl_device_active(dev, 0);
}
static void kgsl_device_inactive(unsigned long data)
{
gsl_autogate_t *autogate = (gsl_autogate_t *)data;
unsigned long flags;
// printk(KERN_ERR "%s:%d id %d active %d\n", __func__, __LINE__, autogate->dev->id, autogate->active);
del_timer(&autogate->timer);
spin_lock_irqsave(&autogate->lock, flags);
if (autogate->active) {
autogate->active = 0;
autogate->pending = 1;
schedule_work(&autogate->dis_task);
}
spin_unlock_irqrestore(&autogate->lock, flags);
}
int kgsl_device_clock(gsl_deviceid_t id, int enable)
{
int ret = GSL_SUCCESS;
gsl_device_t *device;
device = &gsl_driver.device[id-1]; // device_id is 1 based
if (device->flags & GSL_FLAGS_INITIALIZED) {
if (enable)
kgsl_device_active(device);
else
kgsl_device_inactive((unsigned long)device);
} else {
printk(KERN_ERR "%s: Dev %d clock is already off!\n", __func__, id);
ret = GSL_FAILURE;
}
return ret;
}
int kgsl_device_autogate_init(gsl_device_t *dev)
{
gsl_autogate_t *autogate;
// printk(KERN_ERR "%s:%d id %d\n", __func__, __LINE__, dev->id);
autogate = kzalloc(sizeof(gsl_autogate_t), GFP_KERNEL);
if (!autogate) {
printk(KERN_ERR "%s: out of memory!\n", __func__);
return -ENOMEM;
}
mutex_lock(&sem_dev);
autogate->dev = dev;
autogate->active = 1;
spin_lock_init(&autogate->lock);
autogate->timeout = KGSL_DEVICE_IDLE_TIMEOUT;
init_timer(&autogate->timer);
autogate->timer.expires = jiffies + msecs_to_jiffies(autogate->timeout);
autogate->timer.function = kgsl_device_inactive;
autogate->timer.data = (unsigned long)autogate;
add_timer(&autogate->timer);
INIT_WORK(&autogate->dis_task, clk_disable_task);
dev->autogate = autogate;
g_autogate[dev->id - 1] = autogate;
mutex_unlock(&sem_dev);
return 0;
}
void kgsl_device_autogate_exit(gsl_device_t *dev)
{
gsl_autogate_t *autogate = dev->autogate;
// printk(KERN_ERR "%s:%d id %d active %d\n", __func__, __LINE__, dev->id, autogate->active);
mutex_lock(&sem_dev);
del_timer_sync(&autogate->timer);
if (!autogate->active)
kgsl_clock(autogate->dev->id, 1);
flush_work(&autogate->dis_task);
g_autogate[dev->id - 1] = NULL;
mutex_unlock(&sem_dev);
kfree(autogate);
dev->autogate = NULL;
}
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