include/asm-powerpc/scatterlist.h

   1 #ifndef _ASM_POWERPC_SCATTERLIST_H
   2 #define _ASM_POWERPC_SCATTERLIST_H
   3 /*
   4  * Copyright (C) 2001 PPC64 Team, IBM Corp
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #ifdef __KERNEL__
  13 #include <linux/types.h>
  14 #include <asm/dma.h>
  15
  16 struct scatterlist {
  17         struct page *page;
  18         unsigned int offset;
  19         unsigned int length;
  20
  21         /* For TCE support */
  22         dma_addr_t dma_address;
  23         u32 dma_length;
  24 };
  25
  26 /*
  27  * These macros should be used after a dma_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 #ifdef __powerpc64__
  35 #define sg_dma_len(sg)          ((sg)->dma_length)
  36 #else
  37 #define sg_dma_len(sg)          ((sg)->length)
  38 #endif
  39
  40 #ifdef __powerpc64__
  41 #define ISA_DMA_THRESHOLD       (~0UL)
  42 #endif
  43
  44 #endif /* __KERNEL__ */
  45 #endif /* _ASM_POWERPC_SCATTERLIST_H */