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 #define DMA_ERROR_CODE 0
  16
  17 extern struct dma_map_ops *dma_ops;
  18 extern struct ia64_machine_vector ia64_mv;
  19 extern void set_iommu_machvec(void);
  20
  21 extern void machvec_dma_sync_single(struct device *, dma_addr_t, size_t,
  22                                     enum dma_data_direction);
  23 extern void machvec_dma_sync_sg(struct device *, struct scatterlist *, int,
  24                                 enum dma_data_direction);
  25
  26 #define get_dma_ops(dev) platform_dma_get_ops(dev)
  27
  28 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  29 {
  30         if (!dev->dma_mask)
  31                 return 0;
  32
  33         return addr + size - 1 <= *dev->dma_mask;
  34 }
  35
  36 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  37 {
  38         return paddr;
  39 }
  40
  41 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
  42 {
  43         return daddr;
  44 }
  45
  46 static inline void
  47 dma_cache_sync (struct device *dev, void *vaddr, size_t size,
  48         enum dma_data_direction dir)
  49 {
  50         /*
  51          * IA-64 is cache-coherent, so this is mostly a no-op.  However, we do need to
  52          * ensure that dma_cache_sync() enforces order, hence the mb().
  53          */
  54         mb();
  55 }
  56
  57 #endif /* _ASM_IA64_DMA_MAPPING_H */