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