/* * helper functions for SG DMA video4linux capture buffers * * The functions expect the hardware being able to scatter gather * (i.e. the buffers are not linear in physical memory, but fragmented * into PAGE_SIZE chunks). They also assume the driver does not need * to touch the video data. * * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org> * * Highly based on video-buf written originally by: * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org> * (c) 2006 Ted Walther and John Sokol * * 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 */ #ifndef _VIDEOBUF_DMA_SG_H #define _VIDEOBUF_DMA_SG_H #include <media/videobuf-core.h> /* --------------------------------------------------------------------- */ /* * A small set of helper functions to manage buffers (both userland * and kernel) for DMA. * * videobuf_dma_init_*() * creates a buffer. The userland version takes a userspace * pointer + length. The kernel version just wants the size and * does memory allocation too using vmalloc_32(). * * videobuf_dma_*() * see Documentation/DMA-API-HOWTO.txt, these functions to * basically the same. The map function does also build a * scatterlist for the buffer (and unmap frees it ...) * * videobuf_dma_free() * no comment ... * */ struct videobuf_dmabuf { u32 magic; /* for userland buffer */ int offset; size_t size; struct page **pages; /* for kernel buffers */ void *vaddr; struct page **vaddr_pages; dma_addr_t *dma_addr; struct device *dev; /* for overlay buffers (pci-pci dma) */ dma_addr_t bus_addr; /* common */ struct scatterlist *sglist; int sglen; int nr_pages; int direction; }; struct videobuf_dma_sg_memory { u32 magic; /* for mmap'ed buffers */ struct videobuf_dmabuf dma; }; /* * Scatter-gather DMA buffer API. * * These functions provide a simple way to create a page list and a * scatter-gather list from a kernel, userspace of physical address and map the * memory for DMA operation. * * Despite the name, this is totally unrelated to videobuf, except that * videobuf-dma-sg uses the same API internally. */ int videobuf_dma_free(struct videobuf_dmabuf *dma); int videobuf_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma); struct videobuf_dmabuf *videobuf_to_dma(struct videobuf_buffer *buf); void *videobuf_sg_alloc(size_t size); void videobuf_queue_sg_init(struct videobuf_queue *q, const struct videobuf_queue_ops *ops, struct device *dev, spinlock_t *irqlock, enum v4l2_buf_type type, enum v4l2_field field, unsigned int msize, void *priv, struct mutex *ext_lock); #endif /* _VIDEOBUF_DMA_SG_H */
Name | Type | Size | Permission | Actions |
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blackfin | Folder | 0755 |
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davinci | Folder | 0755 |
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drv-intf | Folder | 0755 |
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i2c | Folder | 0755 |
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cec-notifier.h | File | 4.18 KB | 0644 |
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cec-pin.h | File | 3.08 KB | 0644 |
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cec.h | File | 14.21 KB | 0644 |
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i2c-addr.h | File | 1.21 KB | 0644 |
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imx.h | File | 396 B | 0644 |
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lirc.h | File | 29 B | 0644 |
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lirc_dev.h | File | 5.03 KB | 0644 |
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media-device.h | File | 15.76 KB | 0644 |
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media-devnode.h | File | 5.68 KB | 0644 |
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media-entity.h | File | 34.19 KB | 0644 |
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rc-core.h | File | 11.57 KB | 0644 |
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rc-map.h | File | 13.86 KB | 0644 |
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rcar-fcp.h | File | 1.31 KB | 0644 |
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soc_camera.h | File | 12.99 KB | 0644 |
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tuner-types.h | File | 6.99 KB | 0644 |
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tuner.h | File | 8.85 KB | 0644 |
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tveeprom.h | File | 3.29 KB | 0644 |
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v4l2-async.h | File | 6.55 KB | 0644 |
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v4l2-clk.h | File | 2.09 KB | 0644 |
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v4l2-common.h | File | 8.38 KB | 0644 |
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v4l2-ctrls.h | File | 38.06 KB | 0644 |
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v4l2-dev.h | File | 15.05 KB | 0644 |
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v4l2-device.h | File | 11.14 KB | 0644 |
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v4l2-dv-timings.h | File | 8.3 KB | 0644 |
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v4l2-event.h | File | 7.56 KB | 0644 |
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v4l2-fh.h | File | 4.62 KB | 0644 |
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v4l2-flash-led-class.h | File | 5.59 KB | 0644 |
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v4l2-fwnode.h | File | 13.35 KB | 0644 |
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v4l2-image-sizes.h | File | 864 B | 0644 |
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v4l2-ioctl.h | File | 31.31 KB | 0644 |
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v4l2-mc.h | File | 8.02 KB | 0644 |
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v4l2-mediabus.h | File | 4.96 KB | 0644 |
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v4l2-mem2mem.h | File | 19.72 KB | 0644 |
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v4l2-rect.h | File | 5.24 KB | 0644 |
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v4l2-subdev.h | File | 37.77 KB | 0644 |
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v4l2-tpg-colors.h | File | 1.89 KB | 0644 |
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v4l2-tpg.h | File | 14.49 KB | 0644 |
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videobuf-core.h | File | 6.99 KB | 0644 |
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videobuf-dma-contig.h | File | 1.04 KB | 0644 |
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videobuf-dma-sg.h | File | 2.94 KB | 0644 |
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videobuf-dvb.h | File | 1.7 KB | 0644 |
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videobuf-vmalloc.h | File | 1.29 KB | 0644 |
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videobuf2-core.h | File | 39.7 KB | 0644 |
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videobuf2-dma-contig.h | File | 866 B | 0644 |
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videobuf2-dma-sg.h | File | 696 B | 0644 |
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videobuf2-dvb.h | File | 1.79 KB | 0644 |
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videobuf2-memops.h | File | 1.09 KB | 0644 |
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videobuf2-v4l2.h | File | 9.76 KB | 0644 |
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videobuf2-vmalloc.h | File | 509 B | 0644 |
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vsp1.h | File | 1.84 KB | 0644 |
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