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b920de1b DH |
1 | /* MN10300 Scatterlist definitions |
2 | * | |
3 | * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd. | |
4 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public Licence | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the Licence, or (at your option) any later version. | |
10 | */ | |
11 | #ifndef _ASM_SCATTERLIST_H | |
12 | #define _ASM_SCATTERLIST_H | |
13 | ||
14 | #include <asm/types.h> | |
15 | ||
16 | /* | |
17 | * Drivers must set either ->address or (preferred) page and ->offset | |
18 | * to indicate where data must be transferred to/from. | |
19 | * | |
20 | * Using page is recommended since it handles highmem data as well as | |
21 | * low mem. ->address is restricted to data which has a virtual mapping, and | |
22 | * it will go away in the future. Updating to page can be automated very | |
23 | * easily -- something like | |
24 | * | |
25 | * sg->address = some_ptr; | |
26 | * | |
27 | * can be rewritten as | |
28 | * | |
29 | * sg_set_page(virt_to_page(some_ptr)); | |
30 | * sg->offset = (unsigned long) some_ptr & ~PAGE_MASK; | |
31 | * | |
32 | * and that's it. There's no excuse for not highmem enabling YOUR driver. /jens | |
33 | */ | |
34 | struct scatterlist { | |
35 | #ifdef CONFIG_DEBUG_SG | |
36 | unsigned long sg_magic; | |
37 | #endif | |
38 | unsigned long page_link; | |
39 | unsigned int offset; /* for highmem, page offset */ | |
40 | dma_addr_t dma_address; | |
41 | unsigned int length; | |
42 | }; | |
43 | ||
44 | #define ISA_DMA_THRESHOLD (0x00ffffff) | |
45 | ||
91201957 AB |
46 | /* |
47 | * These macros should be used after a pci_map_sg call has been done | |
48 | * to get bus addresses of each of the SG entries and their lengths. | |
49 | * You should only work with the number of sg entries pci_map_sg | |
50 | * returns. | |
51 | */ | |
52 | #define sg_dma_address(sg) ((sg)->dma_address) | |
53 | #define sg_dma_len(sg) ((sg)->length) | |
54 | ||
b920de1b | 55 | #endif /* _ASM_SCATTERLIST_H */ |