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1da177e4 LT |
1 | /* |
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 | ||
de4394f1 SR |
13 | #include <asm/types.h> |
14 | ||
612262a5 | 15 | struct file; |
de4394f1 SR |
16 | struct pci_dev; |
17 | struct scatterlist; | |
18 | struct vm_area_struct; | |
1da177e4 | 19 | |
e1d118f1 SR |
20 | /** |
21 | * struct dma_prog_region - small contiguous DMA buffer | |
22 | * @kvirt: kernel virtual address | |
23 | * @dev: PCI device | |
24 | * @n_pages: number of kernel pages | |
25 | * @bus_addr: base bus address | |
26 | * | |
27 | * a small, physically contiguous DMA buffer with random-access, synchronous | |
28 | * usage characteristics | |
29 | */ | |
1da177e4 | 30 | struct dma_prog_region { |
e1d118f1 SR |
31 | unsigned char *kvirt; |
32 | struct pci_dev *dev; | |
33 | unsigned int n_pages; | |
34 | dma_addr_t bus_addr; | |
1da177e4 LT |
35 | }; |
36 | ||
37 | /* clear out all fields but do not allocate any memory */ | |
38 | void dma_prog_region_init(struct dma_prog_region *prog); | |
e1d118f1 SR |
39 | int dma_prog_region_alloc(struct dma_prog_region *prog, unsigned long n_bytes, |
40 | struct pci_dev *dev); | |
1da177e4 LT |
41 | void dma_prog_region_free(struct dma_prog_region *prog); |
42 | ||
e1d118f1 SR |
43 | static inline dma_addr_t dma_prog_region_offset_to_bus( |
44 | struct dma_prog_region *prog, unsigned long offset) | |
1da177e4 LT |
45 | { |
46 | return prog->bus_addr + offset; | |
47 | } | |
48 | ||
e1d118f1 SR |
49 | /** |
50 | * struct dma_region - large non-contiguous DMA buffer | |
51 | * @virt: kernel virtual address | |
52 | * @dev: PCI device | |
53 | * @n_pages: number of kernel pages | |
54 | * @n_dma_pages: number of IOMMU pages | |
55 | * @sglist: IOMMU mapping | |
56 | * @direction: PCI_DMA_TODEVICE, etc. | |
57 | * | |
58 | * a large, non-physically-contiguous DMA buffer with streaming, asynchronous | |
59 | * usage characteristics | |
60 | */ | |
1da177e4 | 61 | struct dma_region { |
e1d118f1 SR |
62 | unsigned char *kvirt; |
63 | struct pci_dev *dev; | |
64 | unsigned int n_pages; | |
65 | unsigned int n_dma_pages; | |
66 | struct scatterlist *sglist; | |
67 | int direction; | |
1da177e4 LT |
68 | }; |
69 | ||
1da177e4 | 70 | void dma_region_init(struct dma_region *dma); |
e1d118f1 SR |
71 | int dma_region_alloc(struct dma_region *dma, unsigned long n_bytes, |
72 | struct pci_dev *dev, int direction); | |
1da177e4 | 73 | void dma_region_free(struct dma_region *dma); |
e1d118f1 SR |
74 | void dma_region_sync_for_cpu(struct dma_region *dma, unsigned long offset, |
75 | unsigned long len); | |
e1d118f1 SR |
76 | void dma_region_sync_for_device(struct dma_region *dma, unsigned long offset, |
77 | unsigned long len); | |
e1d118f1 SR |
78 | int dma_region_mmap(struct dma_region *dma, struct file *file, |
79 | struct vm_area_struct *vma); | |
afd6546d SR |
80 | dma_addr_t dma_region_offset_to_bus(struct dma_region *dma, |
81 | unsigned long offset); | |
1da177e4 | 82 | |
afd6546d SR |
83 | /** |
84 | * dma_region_i - macro to index into a DMA region (or dma_prog_region) | |
85 | */ | |
e1d118f1 SR |
86 | #define dma_region_i(_dma, _type, _index) \ |
87 | ( ((_type*) ((_dma)->kvirt)) + (_index) ) | |
1da177e4 | 88 | |
1da177e4 | 89 | #endif /* IEEE1394_DMA_H */ |