include/asm-blackfin/scatterlist.h

   1 #ifndef _BLACKFIN_SCATTERLIST_H
   2 #define _BLACKFIN_SCATTERLIST_H
   3
   4 #include <linux/mm.h>
   5
   6 struct scatterlist {
   7         struct page *page;
   8         unsigned int offset;
   9         dma_addr_t dma_address;
  10         unsigned int length;
  11 };
  12
  13 /*
  14  * These macros should be used after a pci_map_sg call has been done
  15  * to get bus addresses of each of the SG entries and their lengths.
  16  * You should only work with the number of sg entries pci_map_sg
  17  * returns, or alternatively stop on the first sg_dma_len(sg) which
  18  * is 0.
  19  */
  20 #define sg_address(sg) (page_address((sg)->page) + (sg)->offset)
  21 #define sg_dma_address(sg)      ((sg)->dma_address)
  22 #define sg_dma_len(sg)          ((sg)->length)
  23
  24 #define ISA_DMA_THRESHOLD       (0xffffffff)
  25
  26 #endif                          /* !(_BLACKFIN_SCATTERLIST_H) */