include/asm-ia64/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
  10 #ifndef CONFIG_XEN
  11
  12 #define dma_alloc_coherent      platform_dma_alloc_coherent
  13 #define dma_alloc_noncoherent   platform_dma_alloc_coherent     /* coherent mem. is cheap */
  14 #define dma_free_coherent       platform_dma_free_coherent
  15 #define dma_free_noncoherent    platform_dma_free_coherent
  16 #define dma_map_single          platform_dma_map_single
  17 #define dma_map_sg              platform_dma_map_sg
  18 #define dma_unmap_single        platform_dma_unmap_single
  19 #define dma_unmap_sg            platform_dma_unmap_sg
  20 #define dma_sync_single_for_cpu platform_dma_sync_single_for_cpu
  21 #define dma_sync_sg_for_cpu     platform_dma_sync_sg_for_cpu
  22 #define dma_sync_single_for_device platform_dma_sync_single_for_device
  23 #define dma_sync_sg_for_device  platform_dma_sync_sg_for_device
  24 #define dma_mapping_error       platform_dma_mapping_error
  25
  26
  27 #else /* CONFIG_XEN */
  28 /* Needed for arch/i386/kernel/swiotlb.c and arch/i386/kernel/pci-dma-xen.c */
  29 #include <asm/hypervisor.h>
  30 /* Needed for arch/i386/kernel/swiotlb.c */
  31 #include <asm-i386/mach-xen/asm/swiotlb.h>
  32
  33 int dma_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  34                enum dma_data_direction direction);
  35 void dma_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
  36                   enum dma_data_direction direction);
  37 int dma_supported(struct device *dev, u64 mask);
  38 void *dma_alloc_coherent(struct device *dev, size_t size,
  39                          dma_addr_t *dma_handle, gfp_t gfp);
  40 void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
  41                        dma_addr_t dma_handle);
  42 dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
  43                           enum dma_data_direction direction);
  44 void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
  45                       enum dma_data_direction direction);
  46 void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
  47                              size_t size, enum dma_data_direction direction);
  48 void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
  49                                 size_t size,
  50                                 enum dma_data_direction direction);
  51 int dma_mapping_error(dma_addr_t dma_addr);
  52
  53 #define flush_write_buffers()   do { } while (0)
  54 static inline void
  55 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
  56                     enum dma_data_direction direction)
  57 {
  58         if (swiotlb)
  59                 swiotlb_sync_sg_for_cpu(dev,sg,nelems,direction);
  60         flush_write_buffers();
  61 }
  62
  63 static inline void
  64 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
  65                        enum dma_data_direction direction)
  66 {
  67         if (swiotlb)
  68                 swiotlb_sync_sg_for_device(dev,sg,nelems,direction);
  69         flush_write_buffers();
  70 }
  71 #endif /* CONFIG_XEN */
  72
  73 #define dma_map_page(dev, pg, off, size, dir)                           \
  74         dma_map_single(dev, page_address(pg) + (off), (size), (dir))
  75 #define dma_unmap_page(dev, dma_addr, size, dir)                        \
  76         dma_unmap_single(dev, dma_addr, size, dir)
  77
  78 /*
  79  * Rest of this file is part of the "Advanced DMA API".  Use at your own risk.
  80  * See Documentation/DMA-API.txt for details.
  81  */
  82
  83 #define dma_sync_single_range_for_cpu(dev, dma_handle, offset, size, dir)       \
  84         dma_sync_single_for_cpu(dev, dma_handle, size, dir)
  85 #define dma_sync_single_range_for_device(dev, dma_handle, offset, size, dir)    \
  86         dma_sync_single_for_device(dev, dma_handle, size, dir)
  87
  88 #ifndef CONFIG_XEN
  89 #define dma_supported           platform_dma_supported
  90 #endif
  91
  92 static inline int
  93 dma_set_mask (struct device *dev, u64 mask)
  94 {
  95         if (!dev->dma_mask || !dma_supported(dev, mask))
  96                 return -EIO;
  97         *dev->dma_mask = mask;
  98         return 0;
  99 }
 100
 101 extern int dma_get_cache_alignment(void);
 102
 103 static inline void
 104 dma_cache_sync (void *vaddr, size_t size, enum dma_data_direction dir)
 105 {
 106         /*
 107          * IA-64 is cache-coherent, so this is mostly a no-op.  However, we do need to
 108          * ensure that dma_cache_sync() enforces order, hence the mb().
 109          */
 110         mb();
 111 }
 112
 113 #define dma_is_consistent(dma_handle)   (1)     /* all we do is coherent memory... */
 114
 115 #ifdef CONFIG_XEN
 116 /* arch/i386/kernel/swiotlb.o requires */
 117 void contiguous_bitmap_init(unsigned long end_pfn);
 118
 119 static inline int
 120 address_needs_mapping(struct device *hwdev, dma_addr_t addr)
 121 {
 122         dma_addr_t mask = DMA_64BIT_MASK;
 123         /* If the device has a mask, use it, otherwise default to 64 bits */
 124         if (hwdev && hwdev->dma_mask)
 125                 mask = *hwdev->dma_mask;
 126         return (addr & ~mask) != 0;
 127 }
 128 #else
 129 #define contiguous_bitmap_init(end_pfn) ((void)end_pfn)
 130 #endif
 131
 132 static inline int
 133 range_straddles_page_boundary(void *p, size_t size)
 134 {
 135         extern unsigned long *contiguous_bitmap;
 136         return (((((unsigned long)p & ~PAGE_MASK) + size) > PAGE_SIZE) &&
 137                 !test_bit(__pa(p) >> PAGE_SHIFT, contiguous_bitmap));
 138 }
 139
 140 #endif /* _ASM_IA64_DMA_MAPPING_H */