summaryrefslogtreecommitdiffstats
path: root/include/asm-xtensa/scatterlist.h
blob: 38a2b9acd658945a438b301016c9140c040bef8a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
/*
 * include/asm-xtensa/scatterlist.h
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001 - 2005 Tensilica Inc.
 */

#ifndef _XTENSA_SCATTERLIST_H
#define _XTENSA_SCATTERLIST_H

struct scatterlist {
	struct page 	*page;
	unsigned int	offset;
	dma_addr_t	dma_address;
	unsigned int	length;
};

/*
 * These macros should be used after a pci_map_sg call has been done
 * to get bus addresses of each of the SG entries and their lengths.
 * You should only work with the number of sg entries pci_map_sg
 * returns, or alternatively stop on the first sg_dma_len(sg) which
 * is 0.
 */
#define sg_dma_address(sg)      ((sg)->dma_address)
#define sg_dma_len(sg)          ((sg)->length)


#define ISA_DMA_THRESHOLD (~0UL)

#endif	/* _XTENSA_SCATTERLIST_H */