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dma.h

/*
 * DMA region bookkeeping routines
 *
 * Copyright (C) 2002 Maas Digital LLC
 *
 * This code is licensed under the GPL.  See the file COPYING in the root
 * directory of the kernel sources for details.
 */

#ifndef IEEE1394_DMA_H
#define IEEE1394_DMA_H

#include <asm/types.h>

struct pci_dev;
struct scatterlist;
struct vm_area_struct;

/**
 * struct dma_prog_region - small contiguous DMA buffer
 * @kvirt:    kernel virtual address
 * @dev:      PCI device
 * @n_pages:  number of kernel pages
 * @bus_addr: base bus address
 *
 * a small, physically contiguous DMA buffer with random-access, synchronous
 * usage characteristics
 */
00029 struct dma_prog_region {
      unsigned char *kvirt;
      struct pci_dev *dev;
      unsigned int n_pages;
      dma_addr_t bus_addr;
};

/* clear out all fields but do not allocate any memory */
void dma_prog_region_init(struct dma_prog_region *prog);
int dma_prog_region_alloc(struct dma_prog_region *prog, unsigned long n_bytes,
                    struct pci_dev *dev);
void dma_prog_region_free(struct dma_prog_region *prog);

static inline dma_addr_t dma_prog_region_offset_to_bus(
            struct dma_prog_region *prog, unsigned long offset)
{
      return prog->bus_addr + offset;
}

/**
 * struct dma_region - large non-contiguous DMA buffer
 * @virt:        kernel virtual address
 * @dev:         PCI device
 * @n_pages:     number of kernel pages
 * @n_dma_pages: number of IOMMU pages
 * @sglist:      IOMMU mapping
 * @direction:   PCI_DMA_TODEVICE, etc.
 *
 * a large, non-physically-contiguous DMA buffer with streaming, asynchronous
 * usage characteristics
 */
00060 struct dma_region {
      unsigned char *kvirt;
      struct pci_dev *dev;
      unsigned int n_pages;
      unsigned int n_dma_pages;
      struct scatterlist *sglist;
      int direction;
};

void dma_region_init(struct dma_region *dma);
int dma_region_alloc(struct dma_region *dma, unsigned long n_bytes,
                 struct pci_dev *dev, int direction);
void dma_region_free(struct dma_region *dma);
void dma_region_sync_for_cpu(struct dma_region *dma, unsigned long offset,
                       unsigned long len);
void dma_region_sync_for_device(struct dma_region *dma, unsigned long offset,
                        unsigned long len);
int  dma_region_mmap(struct dma_region *dma, struct file *file,
                 struct vm_area_struct *vma);
dma_addr_t dma_region_offset_to_bus(struct dma_region *dma,
                            unsigned long offset);

/**
 * dma_region_i - macro to index into a DMA region (or dma_prog_region)
 */
#define dma_region_i(_dma, _type, _index) \
      ( ((_type*) ((_dma)->kvirt)) + (_index) )

#endif /* IEEE1394_DMA_H */

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