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 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 */
89
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