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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 | ||
13 | #include <linux/pci.h> | |
14 | #include <asm/scatterlist.h> | |
15 | ||
16 | /* struct dma_prog_region | |
17 | ||
18 | a small, physically-contiguous DMA buffer with random-access, | |
19 | synchronous usage characteristics | |
20 | */ | |
21 | ||
22 | struct dma_prog_region { | |
23 | unsigned char *kvirt; /* kernel virtual address */ | |
24 | struct pci_dev *dev; /* PCI device */ | |
25 | unsigned int n_pages; /* # of kernel pages */ | |
26 | dma_addr_t bus_addr; /* base bus address */ | |
27 | }; | |
28 | ||
29 | /* clear out all fields but do not allocate any memory */ | |
30 | void dma_prog_region_init(struct dma_prog_region *prog); | |
31 | int dma_prog_region_alloc(struct dma_prog_region *prog, unsigned long n_bytes, struct pci_dev *dev); | |
32 | void dma_prog_region_free(struct dma_prog_region *prog); | |
33 | ||
34 | static inline dma_addr_t dma_prog_region_offset_to_bus(struct dma_prog_region *prog, unsigned long offset) | |
35 | { | |
36 | return prog->bus_addr + offset; | |
37 | } | |
38 | ||
39 | /* struct dma_region | |
40 | ||
41 | a large, non-physically-contiguous DMA buffer with streaming, | |
42 | asynchronous usage characteristics | |
43 | */ | |
44 | ||
45 | struct dma_region { | |
46 | unsigned char *kvirt; /* kernel virtual address */ | |
47 | struct pci_dev *dev; /* PCI device */ | |
48 | unsigned int n_pages; /* # of kernel pages */ | |
49 | unsigned int n_dma_pages; /* # of IOMMU pages */ | |
50 | struct scatterlist *sglist; /* IOMMU mapping */ | |
51 | int direction; /* PCI_DMA_TODEVICE, etc */ | |
52 | }; | |
53 | ||
54 | /* clear out all fields but do not allocate anything */ | |
55 | void dma_region_init(struct dma_region *dma); | |
56 | ||
57 | /* allocate the buffer and map it to the IOMMU */ | |
58 | int dma_region_alloc(struct dma_region *dma, unsigned long n_bytes, struct pci_dev *dev, int direction); | |
59 | ||
60 | /* unmap and free the buffer */ | |
61 | void dma_region_free(struct dma_region *dma); | |
62 | ||
63 | /* sync the CPU's view of the buffer */ | |
64 | void dma_region_sync_for_cpu(struct dma_region *dma, unsigned long offset, unsigned long len); | |
65 | /* sync the IO bus' view of the buffer */ | |
66 | void dma_region_sync_for_device(struct dma_region *dma, unsigned long offset, unsigned long len); | |
67 | ||
68 | /* map the buffer into a user space process */ | |
69 | int dma_region_mmap(struct dma_region *dma, struct file *file, struct vm_area_struct *vma); | |
70 | ||
71 | /* macro to index into a DMA region (or dma_prog_region) */ | |
72 | #define dma_region_i(_dma, _type, _index) ( ((_type*) ((_dma)->kvirt)) + (_index) ) | |
73 | ||
74 | /* return the DMA bus address of the byte with the given offset | |
75 | relative to the beginning of the dma_region */ | |
76 | dma_addr_t dma_region_offset_to_bus(struct dma_region *dma, unsigned long offset); | |
77 | ||
78 | #endif /* IEEE1394_DMA_H */ |