include/asm-xtensa/scatterlist.h

   1 /*
   2  * include/asm-xtensa/scatterlist.h
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (C) 2001 - 2005 Tensilica Inc.
   9  */
  10
  11 #ifndef _XTENSA_SCATTERLIST_H
  12 #define _XTENSA_SCATTERLIST_H
  13
  14 #include <asm/types.h>
  15
  16 struct scatterlist {
  17 #ifdef CONFIG_DEBUG_SG
  18         unsigned long   sg_magic;
  19 #endif
  20         unsigned long   page_link;
  21         unsigned int    offset;
  22         dma_addr_t      dma_address;
  23         unsigned int    length;
  24 };
  25
  26 /*
  27  * These macros should be used after a pci_map_sg call has been done
  28  * to get bus addresses of each of the SG entries and their lengths.
  29  * You should only work with the number of sg entries pci_map_sg
  30  * returns, or alternatively stop on the first sg_dma_len(sg) which
  31  * is 0.
  32  */
  33 #define sg_dma_address(sg)      ((sg)->dma_address)
  34 #define sg_dma_len(sg)          ((sg)->length)
  35
  36
  37 #define ISA_DMA_THRESHOLD (~0UL)
  38
  39 #endif  /* _XTENSA_SCATTERLIST_H */