arch/ia64/include/asm/dma-mapping.h

   1 #ifndef _ASM_IA64_DMA_MAPPING_H
   2 #define _ASM_IA64_DMA_MAPPING_H
   3
   4 /*
   5  * Copyright (C) 2003-2004 Hewlett-Packard Co
   6  *      David Mosberger-Tang <davidm@hpl.hp.com>
   7  */
   8 #include <asm/machvec.h>
   9 #include <linux/scatterlist.h>
  10 #include <asm/swiotlb.h>
  11 #include <linux/dma-debug.h>
  12
  13 #define ARCH_HAS_DMA_GET_REQUIRED_MASK
  14
  15 extern const struct dma_map_ops *dma_ops;
  16 extern struct ia64_machine_vector ia64_mv;
  17 extern void set_iommu_machvec(void);
  18
  19 extern void machvec_dma_sync_single(struct device *, dma_addr_t, size_t,
  20                                     enum dma_data_direction);
  21 extern void machvec_dma_sync_sg(struct device *, struct scatterlist *, int,
  22                                 enum dma_data_direction);
  23
  24 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
  25 {
  26         return platform_dma_get_ops(NULL);
  27 }
  28
  29 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  30 {
  31         if (!dev->dma_mask)
  32                 return 0;
  33
  34         return addr + size - 1 <= *dev->dma_mask;
  35 }
  36
  37 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  38 {
  39         return paddr;
  40 }
  41
  42 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
  43 {
  44         return daddr;
  45 }
  46
  47 static inline void
  48 dma_cache_sync (struct device *dev, void *vaddr, size_t size,
  49         enum dma_data_direction dir)
  50 {
  51         /*
  52          * IA-64 is cache-coherent, so this is mostly a no-op.  However, we do need to
  53          * ensure that dma_cache_sync() enforces order, hence the mb().
  54          */
  55         mb();
  56 }
  57
  58 #endif /* _ASM_IA64_DMA_MAPPING_H */