2 * DMA region bookkeeping routines
4 * Copyright (C) 2002 Maas Digital LLC
6 * This code is licensed under the GPL. See the file COPYING in the root
7 * directory of the kernel sources for details.
10 #ifndef IEEE1394_DMA_H
11 #define IEEE1394_DMA_H
13 #include <asm/types.h>
17 struct vm_area_struct
;
20 * struct dma_prog_region - small contiguous DMA buffer
21 * @kvirt: kernel virtual address
23 * @n_pages: number of kernel pages
24 * @bus_addr: base bus address
26 * a small, physically contiguous DMA buffer with random-access, synchronous
27 * usage characteristics
29 struct dma_prog_region
{
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
,
40 void dma_prog_region_free(struct dma_prog_region
*prog
);
42 static inline dma_addr_t
dma_prog_region_offset_to_bus(
43 struct dma_prog_region
*prog
, unsigned long offset
)
45 return prog
->bus_addr
+ offset
;
49 * struct dma_region - large non-contiguous DMA buffer
50 * @virt: kernel virtual address
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.
57 * a large, non-physically-contiguous DMA buffer with streaming, asynchronous
58 * usage characteristics
64 unsigned int n_dma_pages
;
65 struct scatterlist
*sglist
;
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
,
75 void dma_region_sync_for_device(struct dma_region
*dma
, unsigned long offset
,
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
);
83 * dma_region_i - macro to index into a DMA region (or dma_prog_region)
85 #define dma_region_i(_dma, _type, _index) \
86 ( ((_type*) ((_dma)->kvirt)) + (_index) )
88 #endif /* IEEE1394_DMA_H */
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