xtensa: use use asm-generic/scatterlist.h

#ifndef _XTENSA_SCATTERLIST_H

#define _XTENSA_SCATTERLIST_H

#include <asm/types.h>

struct scatterlist {

#ifdef CONFIG_DEBUG_SG

	unsigned long	sg_magic;

#endif

	unsigned long	page_link;

	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)

#include <asm-generic/scatterlist.h>

#define ISA_DMA_THRESHOLD (~0UL)