[linux-2.6-block.git] / include / asm-frv / scatterlist.h

#ifndef _ASM_SCATTERLIST_H
#define _ASM_SCATTERLIST_H

#include <asm/types.h>

/*
 * Drivers must set either ->address or (preferred) page and ->offset
 * to indicate where data must be transferred to/from.
 *
 * Using page is recommended since it handles highmem data as well as
 * low mem. ->address is restricted to data which has a virtual mapping, and
 * it will go away in the future. Updating to page can be automated very
 * easily -- something like
 *
 * sg->address = some_ptr;
 *
 * can be rewritten as
 *
 * sg_set_buf(sg, some_ptr, length);
 *
 * and that's it. There's no excuse for not highmem enabling YOUR driver. /jens
 */
struct scatterlist {
#ifdef CONFIG_DEBUG_SG
	unsigned long	sg_magic;
#endif
	unsigned long	page_link;
	unsigned int	offset;		/* for highmem, page 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 (0xffffffffUL)

#endif /* !_ASM_SCATTERLIST_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _ASM_SCATTERLIST_H
	2	#define _ASM_SCATTERLIST_H
	3
a9dfd281 JD	4	#include <asm/types.h>
a9dfd281 JD	5
1da177e4	6	/*
d09d276e	7	* Drivers must set either ->address or (preferred) page and ->offset
1da177e4 LT	8	* to indicate where data must be transferred to/from.
1da177e4 LT	9	*
d09d276e	10	* Using page is recommended since it handles highmem data as well as
1da177e4	11	* low mem. ->address is restricted to data which has a virtual mapping, and
d09d276e	12	* it will go away in the future. Updating to page can be automated very
1da177e4 LT	13	* easily -- something like
	14	*
	15	* sg->address = some_ptr;
	16	*
	17	* can be rewritten as
	18	*
642f1490	19	* sg_set_buf(sg, some_ptr, length);
1da177e4 LT	20	*
	21	* and that's it. There's no excuse for not highmem enabling YOUR driver. /jens
	22	*/
	23	struct scatterlist {
d6ec0842 JA	24	#ifdef CONFIG_DEBUG_SG
	25	unsigned long sg_magic;
	26	#endif
18dabf47	27	unsigned long page_link;
1da177e4 LT	28	unsigned int offset; /* for highmem, page offset */
	29
	30	dma_addr_t dma_address;
	31	unsigned int length;
	32	};
	33
82b12e23 RD	34	/*
	35	* These macros should be used after a pci_map_sg call has been done
	36	* to get bus addresses of each of the SG entries and their lengths.
	37	* You should only work with the number of sg entries pci_map_sg
	38	* returns, or alternatively stop on the first sg_dma_len(sg) which
	39	* is 0.
	40	*/
	41	#define sg_dma_address(sg) ((sg)->dma_address)
	42	#define sg_dma_len(sg) ((sg)->length)
	43
1da177e4 LT	44	#define ISA_DMA_THRESHOLD (0xffffffffUL)
	45
	46	#endif /* !_ASM_SCATTERLIST_H */