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/*
* drivers/video/tegra/host/nvhost_channel.c
*
* Tegra Graphics Host Channel
*
* Copyright (c) 2010, NVIDIA Corporation.
*
* 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 "nvhost_channel.h"
#include "dev.h"
#include "nvhost_hwctx.h"
#include <trace/events/nvhost.h>
#include <linux/platform_device.h>
struct nvhost_channel *nvhost_getchannel(struct nvhost_channel *ch)
{
int err = 0;
mutex_lock(&ch->reflock);
if (ch->refcount == 0) {
err = nvhost_module_init(&ch->mod, ch->desc->name,
ch->desc->power, &ch->dev->mod,
&ch->dev->pdev->dev);
if (!err) {
err = nvhost_cdma_init(&ch->cdma);
if (err)
nvhost_module_deinit(&ch->mod);
}
} else if (ch->desc->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->desc->keepalive)
nvhost_module_busy(&ch->mod);
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->desc->keepalive)
nvhost_module_idle(&ch->mod);
mutex_lock(&ch->reflock);
if (ch->refcount == 1) {
nvhost_module_deinit(&ch->mod);
/* cdma may already be stopped, that's ok */
channel_cdma_op(ch).stop(&ch->cdma);
nvhost_cdma_deinit(&ch->cdma);
}
ch->refcount--;
mutex_unlock(&ch->reflock);
}
void nvhost_channel_suspend(struct nvhost_channel *ch)
{
mutex_lock(&ch->reflock);
BUG_ON(nvhost_module_powered(&ch->mod));
BUG_ON(!channel_cdma_op(ch).stop);
if (ch->refcount)
channel_cdma_op(ch).stop(&ch->cdma);
mutex_unlock(&ch->reflock);
}
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