arch/powerpc/include/asm/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 #ifdef CONFIG_DEBUG_SG
  18         unsigned long sg_magic;
  19 #endif
  20         unsigned long page_link;
  21         unsigned int offset;
  22         unsigned int length;
  23
  24         /* For TCE or SWIOTLB support */
  25         dma_addr_t dma_address;
  26         u32 dma_length;
  27 };
  28
  29 /*
  30  * These macros should be used after a dma_map_sg call has been done
  31  * to get bus addresses of each of the SG entries and their lengths.
  32  * You should only work with the number of sg entries pci_map_sg
  33  * returns, or alternatively stop on the first sg_dma_len(sg) which
  34  * is 0.
  35  */
  36 #define sg_dma_address(sg)      ((sg)->dma_address)
  37 #define sg_dma_len(sg)          ((sg)->dma_length)
  38
  39 #ifdef __powerpc64__
  40 #define ISA_DMA_THRESHOLD       (~0UL)
  41 #endif
  42
  43 #define ARCH_HAS_SG_CHAIN
  44
  45 #endif /* __KERNEL__ */
  46 #endif /* _ASM_POWERPC_SCATTERLIST_H */