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/*
* drivers/video/tegra/host/nvhost_channel.c
*
* Tegra Graphics Host Channel
*
* Copyright (c) 2010-2012, NVIDIA Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
*/
#include "nvhost_channel.h"
#include "dev.h"
#include "nvhost_acm.h"
#include "nvhost_job.h"
#include <trace/events/nvhost.h>
#include <linux/nvhost_ioctl.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#define NVHOST_CHANNEL_LOW_PRIO_MAX_WAIT 50
int nvhost_channel_init(struct nvhost_channel *ch,
struct nvhost_master *dev, int index)
{
int err;
struct nvhost_device *ndev;
/* Link nvhost_device to nvhost_channel */
err = host_channel_op(dev).init(ch, dev, index);
if (err < 0) {
dev_err(&dev->dev->dev, "failed to init channel %d\n",
index);
return err;
}
ndev = ch->dev;
ndev->channel = ch;
return 0;
}
int nvhost_channel_submit(struct nvhost_job *job)
{
/* Low priority submits wait until sync queue is empty. Ignores result
* from nvhost_cdma_flush, as we submit either when push buffer is
* empty or when we reach the timeout. */
if (job->priority < NVHOST_PRIORITY_MEDIUM)
(void)nvhost_cdma_flush(&job->ch->cdma,
NVHOST_CHANNEL_LOW_PRIO_MAX_WAIT);
return channel_op(job->ch).submit(job);
}
struct nvhost_channel *nvhost_getchannel(struct nvhost_channel *ch)
{
int err = 0;
mutex_lock(&ch->reflock);
if (ch->refcount == 0) {
if (ch->dev->init)
ch->dev->init(ch->dev);
err = nvhost_cdma_init(&ch->cdma);
} else if (ch->dev->exclusive) {
err = -EBUSY;
}
if (!err)
ch->refcount++;
mutex_unlock(&ch->reflock);
/* Keep alive modules that needs to be when a channel is open */
if (!err && ch->dev->keepalive)
nvhost_module_busy(ch->dev);
return err ? NULL : ch;
}
void nvhost_putchannel(struct nvhost_channel *ch, struct nvhost_hwctx *ctx)
{
BUG_ON(!channel_cdma_op(ch).stop);
if (ctx) {
mutex_lock(&ch->submitlock);
if (ch->cur_ctx == ctx)
ch->cur_ctx = NULL;
mutex_unlock(&ch->submitlock);
}
/* Allow keep-alive'd module to be turned off */
if (ch->dev->keepalive)
nvhost_module_idle(ch->dev);
mutex_lock(&ch->reflock);
if (ch->refcount == 1) {
channel_cdma_op(ch).stop(&ch->cdma);
nvhost_cdma_deinit(&ch->cdma);
nvhost_module_suspend(ch->dev);
}
ch->refcount--;
mutex_unlock(&ch->reflock);
}
int nvhost_channel_suspend(struct nvhost_channel *ch)
{
int ret = 0;
mutex_lock(&ch->reflock);
BUG_ON(!channel_cdma_op(ch).stop);
if (ch->refcount) {
ret = nvhost_module_suspend(ch->dev);
if (!ret)
channel_cdma_op(ch).stop(&ch->cdma);
}
mutex_unlock(&ch->reflock);
return ret;
}
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