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* Xilinx Video DMA
* Copyright (C) 2013-2015 Ideas on Board
* Copyright (C) 2013-2015 Xilinx, Inc.
* Contacts: Hyun Kwon <>
* Laurent Pinchart <>
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
#ifndef __XILINX_VIP_DMA_H__
#define __XILINX_VIP_DMA_H__
#include <linux/dmaengine.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/videodev2.h>
#include <media/media-entity.h>
#include <media/v4l2-dev.h>
#include <media/videobuf2-v4l2.h>
struct dma_chan;
struct xvip_composite_device;
struct xvip_video_format;
* struct xvip_pipeline - Xilinx Video IP pipeline structure
* @pipe: media pipeline
* @lock: protects the pipeline @stream_count
* @use_count: number of DMA engines using the pipeline
* @stream_count: number of DMA engines currently streaming
* @num_dmas: number of DMA engines in the pipeline
* @output: DMA engine at the output of the pipeline
struct xvip_pipeline {
struct media_pipeline pipe;
struct mutex lock;
unsigned int use_count;
unsigned int stream_count;
unsigned int num_dmas;
struct xvip_dma *output;
static inline struct xvip_pipeline *to_xvip_pipeline(struct media_entity *e)
return container_of(e->pipe, struct xvip_pipeline, pipe);
* struct xvip_dma - Video DMA channel
* @list: list entry in a composite device dmas list
* @video: V4L2 video device associated with the DMA channel
* @pad: media pad for the video device entity
* @xdev: composite device the DMA channel belongs to
* @pipe: pipeline belonging to the DMA channel
* @port: composite device DT node port number for the DMA channel
* @lock: protects the @format, @fmtinfo and @queue fields
* @format: active V4L2 pixel format
* @fmtinfo: format information corresponding to the active @format
* @queue: vb2 buffers queue
* @alloc_ctx: allocation context for the vb2 @queue
* @sequence: V4L2 buffers sequence number
* @queued_bufs: list of queued buffers
* @queued_lock: protects the buf_queued list
* @dma: DMA engine channel
* @align: transfer alignment required by the DMA channel (in bytes)
* @xt: dma interleaved template for dma configuration
* @sgl: data chunk structure for dma_interleaved_template
struct xvip_dma {
struct list_head list;
struct video_device video;
struct media_pad pad;
struct xvip_composite_device *xdev;
struct xvip_pipeline pipe;
unsigned int port;
struct mutex lock;
struct v4l2_pix_format format;
const struct xvip_video_format *fmtinfo;
struct vb2_queue queue;
void *alloc_ctx;
unsigned int sequence;
struct list_head queued_bufs;
spinlock_t queued_lock;
struct dma_chan *dma;
unsigned int align;
struct dma_interleaved_template xt;
struct data_chunk sgl[1];
#define to_xvip_dma(vdev) container_of(vdev, struct xvip_dma, video)
int xvip_dma_init(struct xvip_composite_device *xdev, struct xvip_dma *dma,
enum v4l2_buf_type type, unsigned int port);
void xvip_dma_cleanup(struct xvip_dma *dma);
#endif /* __XILINX_VIP_DMA_H__ */