drivers/media/platform/xilinx/xilinx-dma.h

/*
 * Xilinx Video DMA
 *
 * Copyright (C) 2013-2015 Ideas on Board
 * Copyright (C) 2013-2015 Xilinx, Inc.
 *
 * Contacts: Hyun Kwon <hyun.kwon@xilinx.com>
 *           Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 *
 * 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__ */