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/*
* drivers/video/tegra/dc/ext/util.c
*
* Copyright (c) 2011-2014, NVIDIA CORPORATION, All rights reserved.
*
* Author: Robert Morell <rmorell@nvidia.com>
*
* 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.
*/
#include <linux/err.h>
#include <linux/types.h>
#include <mach/dc.h>
#include <linux/dma-buf.h>
#include "tegra_dc_ext_priv.h"
int tegra_dc_ext_pin_window(struct tegra_dc_ext_user *user, u32 fd,
struct tegra_dc_dmabuf **dc_buf,
dma_addr_t *phys_addr)
{
struct tegra_dc_ext *ext = user->ext;
struct tegra_dc_dmabuf *dc_dmabuf;
dma_addr_t dma_addr;
*dc_buf = NULL;
*phys_addr = -1;
if (!fd)
return 0;
dc_dmabuf = kzalloc(sizeof(*dc_dmabuf), GFP_KERNEL);
if (!dc_dmabuf)
return -ENOMEM;
dc_dmabuf->buf = dma_buf_get(fd);
if (IS_ERR_OR_NULL(dc_dmabuf->buf))
goto buf_fail;
dc_dmabuf->attach = dma_buf_attach(dc_dmabuf->buf, ext->dev->parent);
if (IS_ERR_OR_NULL(dc_dmabuf->attach))
goto attach_fail;
dc_dmabuf->sgt = dma_buf_map_attachment(dc_dmabuf->attach,
DMA_TO_DEVICE);
if (IS_ERR_OR_NULL(dc_dmabuf->sgt))
goto sgt_fail;
dma_addr = sg_dma_address(dc_dmabuf->sgt->sgl);
if (dma_addr)
*phys_addr = dma_addr;
else
*phys_addr = sg_phys(dc_dmabuf->sgt->sgl);
*dc_buf = dc_dmabuf;
return 0;
sgt_fail:
dma_buf_detach(dc_dmabuf->buf, dc_dmabuf->attach);
attach_fail:
dma_buf_put(dc_dmabuf->buf);
buf_fail:
kfree(dc_dmabuf);
return -ENOMEM;
}
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