| 1 |
62 |
marcus.erl |
/*
|
| 2 |
|
|
* DMA region bookkeeping routines
|
| 3 |
|
|
*
|
| 4 |
|
|
* Copyright (C) 2002 Maas Digital LLC
|
| 5 |
|
|
*
|
| 6 |
|
|
* This code is licensed under the GPL. See the file COPYING in the root
|
| 7 |
|
|
* directory of the kernel sources for details.
|
| 8 |
|
|
*/
|
| 9 |
|
|
|
| 10 |
|
|
#ifndef IEEE1394_DMA_H
|
| 11 |
|
|
#define IEEE1394_DMA_H
|
| 12 |
|
|
|
| 13 |
|
|
#include <asm/types.h>
|
| 14 |
|
|
|
| 15 |
|
|
struct pci_dev;
|
| 16 |
|
|
struct scatterlist;
|
| 17 |
|
|
struct vm_area_struct;
|
| 18 |
|
|
|
| 19 |
|
|
/**
|
| 20 |
|
|
* struct dma_prog_region - small contiguous DMA buffer
|
| 21 |
|
|
* @kvirt: kernel virtual address
|
| 22 |
|
|
* @dev: PCI device
|
| 23 |
|
|
* @n_pages: number of kernel pages
|
| 24 |
|
|
* @bus_addr: base bus address
|
| 25 |
|
|
*
|
| 26 |
|
|
* a small, physically contiguous DMA buffer with random-access, synchronous
|
| 27 |
|
|
* usage characteristics
|
| 28 |
|
|
*/
|
| 29 |
|
|
struct dma_prog_region {
|
| 30 |
|
|
unsigned char *kvirt;
|
| 31 |
|
|
struct pci_dev *dev;
|
| 32 |
|
|
unsigned int n_pages;
|
| 33 |
|
|
dma_addr_t bus_addr;
|
| 34 |
|
|
};
|
| 35 |
|
|
|
| 36 |
|
|
/* clear out all fields but do not allocate any memory */
|
| 37 |
|
|
void dma_prog_region_init(struct dma_prog_region *prog);
|
| 38 |
|
|
int dma_prog_region_alloc(struct dma_prog_region *prog, unsigned long n_bytes,
|
| 39 |
|
|
struct pci_dev *dev);
|
| 40 |
|
|
void dma_prog_region_free(struct dma_prog_region *prog);
|
| 41 |
|
|
|
| 42 |
|
|
static inline dma_addr_t dma_prog_region_offset_to_bus(
|
| 43 |
|
|
struct dma_prog_region *prog, unsigned long offset)
|
| 44 |
|
|
{
|
| 45 |
|
|
return prog->bus_addr + offset;
|
| 46 |
|
|
}
|
| 47 |
|
|
|
| 48 |
|
|
/**
|
| 49 |
|
|
* struct dma_region - large non-contiguous DMA buffer
|
| 50 |
|
|
* @virt: kernel virtual address
|
| 51 |
|
|
* @dev: PCI device
|
| 52 |
|
|
* @n_pages: number of kernel pages
|
| 53 |
|
|
* @n_dma_pages: number of IOMMU pages
|
| 54 |
|
|
* @sglist: IOMMU mapping
|
| 55 |
|
|
* @direction: PCI_DMA_TODEVICE, etc.
|
| 56 |
|
|
*
|
| 57 |
|
|
* a large, non-physically-contiguous DMA buffer with streaming, asynchronous
|
| 58 |
|
|
* usage characteristics
|
| 59 |
|
|
*/
|
| 60 |
|
|
struct dma_region {
|
| 61 |
|
|
unsigned char *kvirt;
|
| 62 |
|
|
struct pci_dev *dev;
|
| 63 |
|
|
unsigned int n_pages;
|
| 64 |
|
|
unsigned int n_dma_pages;
|
| 65 |
|
|
struct scatterlist *sglist;
|
| 66 |
|
|
int direction;
|
| 67 |
|
|
};
|
| 68 |
|
|
|
| 69 |
|
|
void dma_region_init(struct dma_region *dma);
|
| 70 |
|
|
int dma_region_alloc(struct dma_region *dma, unsigned long n_bytes,
|
| 71 |
|
|
struct pci_dev *dev, int direction);
|
| 72 |
|
|
void dma_region_free(struct dma_region *dma);
|
| 73 |
|
|
void dma_region_sync_for_cpu(struct dma_region *dma, unsigned long offset,
|
| 74 |
|
|
unsigned long len);
|
| 75 |
|
|
void dma_region_sync_for_device(struct dma_region *dma, unsigned long offset,
|
| 76 |
|
|
unsigned long len);
|
| 77 |
|
|
int dma_region_mmap(struct dma_region *dma, struct file *file,
|
| 78 |
|
|
struct vm_area_struct *vma);
|
| 79 |
|
|
dma_addr_t dma_region_offset_to_bus(struct dma_region *dma,
|
| 80 |
|
|
unsigned long offset);
|
| 81 |
|
|
|
| 82 |
|
|
/**
|
| 83 |
|
|
* dma_region_i - macro to index into a DMA region (or dma_prog_region)
|
| 84 |
|
|
*/
|
| 85 |
|
|
#define dma_region_i(_dma, _type, _index) \
|
| 86 |
|
|
( ((_type*) ((_dma)->kvirt)) + (_index) )
|
| 87 |
|
|
|
| 88 |
|
|
#endif /* IEEE1394_DMA_H */
|
