90 строки
2.5 KiB
C
90 строки
2.5 KiB
C
/*
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* DMA region bookkeeping routines
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*
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* Copyright (C) 2002 Maas Digital LLC
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*
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* This code is licensed under the GPL. See the file COPYING in the root
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* directory of the kernel sources for details.
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*/
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#ifndef IEEE1394_DMA_H
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#define IEEE1394_DMA_H
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#include <asm/types.h>
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struct file;
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struct pci_dev;
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struct scatterlist;
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struct vm_area_struct;
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/**
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* struct dma_prog_region - small contiguous DMA buffer
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* @kvirt: kernel virtual address
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* @dev: PCI device
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* @n_pages: number of kernel pages
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* @bus_addr: base bus address
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*
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* a small, physically contiguous DMA buffer with random-access, synchronous
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* usage characteristics
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*/
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struct dma_prog_region {
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unsigned char *kvirt;
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struct pci_dev *dev;
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unsigned int n_pages;
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dma_addr_t bus_addr;
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};
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/* clear out all fields but do not allocate any memory */
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void dma_prog_region_init(struct dma_prog_region *prog);
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int dma_prog_region_alloc(struct dma_prog_region *prog, unsigned long n_bytes,
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struct pci_dev *dev);
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void dma_prog_region_free(struct dma_prog_region *prog);
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static inline dma_addr_t dma_prog_region_offset_to_bus(
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struct dma_prog_region *prog, unsigned long offset)
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{
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return prog->bus_addr + offset;
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}
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/**
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* struct dma_region - large non-contiguous DMA buffer
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* @virt: kernel virtual address
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* @dev: PCI device
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* @n_pages: number of kernel pages
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* @n_dma_pages: number of IOMMU pages
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* @sglist: IOMMU mapping
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* @direction: PCI_DMA_TODEVICE, etc.
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*
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* a large, non-physically-contiguous DMA buffer with streaming, asynchronous
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* usage characteristics
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*/
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struct dma_region {
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unsigned char *kvirt;
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struct pci_dev *dev;
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unsigned int n_pages;
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unsigned int n_dma_pages;
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struct scatterlist *sglist;
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int direction;
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};
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void dma_region_init(struct dma_region *dma);
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int dma_region_alloc(struct dma_region *dma, unsigned long n_bytes,
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struct pci_dev *dev, int direction);
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void dma_region_free(struct dma_region *dma);
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void dma_region_sync_for_cpu(struct dma_region *dma, unsigned long offset,
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unsigned long len);
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void dma_region_sync_for_device(struct dma_region *dma, unsigned long offset,
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unsigned long len);
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int dma_region_mmap(struct dma_region *dma, struct file *file,
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struct vm_area_struct *vma);
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dma_addr_t dma_region_offset_to_bus(struct dma_region *dma,
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unsigned long offset);
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/**
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* dma_region_i - macro to index into a DMA region (or dma_prog_region)
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*/
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#define dma_region_i(_dma, _type, _index) \
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( ((_type*) ((_dma)->kvirt)) + (_index) )
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#endif /* IEEE1394_DMA_H */
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