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

   1 /*
   2  * Xilinx Video DMA
   3  *
   4  * Copyright (C) 2013-2015 Ideas on Board
   5  * Copyright (C) 2013-2015 Xilinx, Inc.
   6  *
   7  * Contacts: Hyun Kwon <hyun.kwon@xilinx.com>
   8  *           Laurent Pinchart <laurent.pinchart@ideasonboard.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #ifndef __XILINX_VIP_DMA_H__
  16 #define __XILINX_VIP_DMA_H__
  17
  18 #include <linux/dmaengine.h>
  19 #include <linux/mutex.h>
  20 #include <linux/spinlock.h>
  21 #include <linux/videodev2.h>
  22
  23 #include <media/media-entity.h>
  24 #include <media/v4l2-dev.h>
  25 #include <media/videobuf2-core.h>
  26
  27 struct dma_chan;
  28 struct xvip_composite_device;
  29 struct xvip_video_format;
  30
  31 /**
  32  * struct xvip_pipeline - Xilinx Video IP pipeline structure
  33  * @pipe: media pipeline
  34  * @lock: protects the pipeline @stream_count
  35  * @use_count: number of DMA engines using the pipeline
  36  * @stream_count: number of DMA engines currently streaming
  37  * @num_dmas: number of DMA engines in the pipeline
  38  * @output: DMA engine at the output of the pipeline
  39  */
  40 struct xvip_pipeline {
  41         struct media_pipeline pipe;
  42
  43         struct mutex lock;
  44         unsigned int use_count;
  45         unsigned int stream_count;
  46
  47         unsigned int num_dmas;
  48         struct xvip_dma *output;
  49 };
  50
  51 static inline struct xvip_pipeline *to_xvip_pipeline(struct media_entity *e)
  52 {
  53         return container_of(e->pipe, struct xvip_pipeline, pipe);
  54 }
  55
  56 /**
  57  * struct xvip_dma - Video DMA channel
  58  * @list: list entry in a composite device dmas list
  59  * @video: V4L2 video device associated with the DMA channel
  60  * @pad: media pad for the video device entity
  61  * @xdev: composite device the DMA channel belongs to
  62  * @pipe: pipeline belonging to the DMA channel
  63  * @port: composite device DT node port number for the DMA channel
  64  * @lock: protects the @format, @fmtinfo and @queue fields
  65  * @format: active V4L2 pixel format
  66  * @fmtinfo: format information corresponding to the active @format
  67  * @queue: vb2 buffers queue
  68  * @alloc_ctx: allocation context for the vb2 @queue
  69  * @sequence: V4L2 buffers sequence number
  70  * @queued_bufs: list of queued buffers
  71  * @queued_lock: protects the buf_queued list
  72  * @dma: DMA engine channel
  73  * @align: transfer alignment required by the DMA channel (in bytes)
  74  * @xt: dma interleaved template for dma configuration
  75  * @sgl: data chunk structure for dma_interleaved_template
  76  */
  77 struct xvip_dma {
  78         struct list_head list;
  79         struct video_device video;
  80         struct media_pad pad;
  81
  82         struct xvip_composite_device *xdev;
  83         struct xvip_pipeline pipe;
  84         unsigned int port;
  85
  86         struct mutex lock;
  87         struct v4l2_pix_format format;
  88         const struct xvip_video_format *fmtinfo;
  89
  90         struct vb2_queue queue;
  91         void *alloc_ctx;
  92         unsigned int sequence;
  93
  94         struct list_head queued_bufs;
  95         spinlock_t queued_lock;
  96
  97         struct dma_chan *dma;
  98         unsigned int align;
  99         struct dma_interleaved_template xt;
 100         struct data_chunk sgl[1];
 101 };
 102
 103 #define to_xvip_dma(vdev)       container_of(vdev, struct xvip_dma, video)
 104
 105 int xvip_dma_init(struct xvip_composite_device *xdev, struct xvip_dma *dma,
 106                   enum v4l2_buf_type type, unsigned int port);
 107 void xvip_dma_cleanup(struct xvip_dma *dma);
 108
 109 #endif /* __XILINX_VIP_DMA_H__ */