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
13 #include <asm/types.h>
14
15 struct file;
16 struct pci_dev;
17 struct scatterlist;
18 struct vm_area_struct;
19
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 */
30 struct dma_prog_region {
31 unsigned char *kvirt;
32 struct pci_dev *dev;
33 unsigned int n_pages;
34 dma_addr_t bus_addr;
35 };
36
37 /* clear out all fields but do not allocate any memory */
38 void dma_prog_region_init(struct dma_prog_region *prog);
39 int dma_prog_region_alloc(struct dma_prog_region *prog, unsigned long n_bytes,
40 struct pci_dev *dev);
41 void dma_prog_region_free(struct dma_prog_region *prog);
42
43 static inline dma_addr_t dma_prog_region_offset_to_bus(
44 struct dma_prog_region *prog, unsigned long offset)
45 {
46 return prog->bus_addr + offset;
47 }
48
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 */
61 struct dma_region {
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;
68 };
69
70 void dma_region_init(struct dma_region *dma);
71 int dma_region_alloc(struct dma_region *dma, unsigned long n_bytes,
72 struct pci_dev *dev, int direction);
73 void dma_region_free(struct dma_region *dma);
74 void dma_region_sync_for_cpu(struct dma_region *dma, unsigned long offset,
75 unsigned long len);
76 void dma_region_sync_for_device(struct dma_region *dma, unsigned long offset,
77 unsigned long len);
78 int dma_region_mmap(struct dma_region *dma, struct file *file,
79 struct vm_area_struct *vma);
80 dma_addr_t dma_region_offset_to_bus(struct dma_region *dma,
81 unsigned long offset);
82
83 /**
84 * dma_region_i - macro to index into a DMA region (or dma_prog_region)
85 */
86 #define dma_region_i(_dma, _type, _index) \
87 ( ((_type*) ((_dma)->kvirt)) + (_index) )
88
89 #endif /* IEEE1394_DMA_H */
90
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