diff options
Diffstat (limited to 'drivers/media/platform/xilinx/xilinx-dma.h')
| -rw-r--r-- | drivers/media/platform/xilinx/xilinx-dma.h | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/drivers/media/platform/xilinx/xilinx-dma.h b/drivers/media/platform/xilinx/xilinx-dma.h new file mode 100644 index 000000000000..a540111f8d3d --- /dev/null +++ b/drivers/media/platform/xilinx/xilinx-dma.h @@ -0,0 +1,109 @@ +/* + * 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-core.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__ */ |