release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mn10300/include/asm/dma-mapping.h

   1 /* DMA mapping routines for the MN10300 arch
   2  *
   3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public Licence
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the Licence, or (at your option) any later version.
  10  */
  11 #ifndef _ASM_DMA_MAPPING_H
  12 #define _ASM_DMA_MAPPING_H
  13
  14 #include <linux/mm.h>
  15 #include <linux/scatterlist.h>
  16
  17 #include <asm/cache.h>
  18 #include <asm/io.h>
  19
  20 /*
  21  * See Documentation/DMA-API.txt for the description of how the
  22  * following DMA API should work.
  23  */
  24
  25 extern void *dma_alloc_coherent(struct device *dev, size_t size,
  26                                 dma_addr_t *dma_handle, int flag);
  27
  28 extern void dma_free_coherent(struct device *dev, size_t size,
  29                               void *vaddr, dma_addr_t dma_handle);
  30
  31 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent((d), (s), (h), (f))
  32 #define dma_free_noncoherent(d, s, v, h)  dma_free_coherent((d), (s), (v), (h))
  33
  34 static inline
  35 dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
  36                           enum dma_data_direction direction)
  37 {
  38         BUG_ON(direction == DMA_NONE);
  39         mn10300_dcache_flush_inv();
  40         return virt_to_bus(ptr);
  41 }
  42
  43 static inline
  44 void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
  45                       enum dma_data_direction direction)
  46 {
  47         BUG_ON(direction == DMA_NONE);
  48 }
  49
  50 static inline
  51 int dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
  52                enum dma_data_direction direction)
  53 {
  54         struct scatterlist *sg;
  55         int i;
  56
  57         BUG_ON(!valid_dma_direction(direction));
  58         WARN_ON(nents == 0 || sglist[0].length == 0);
  59
  60         for_each_sg(sglist, sg, nents, i) {
  61                 BUG_ON(!sg_page(sg));
  62
  63                 sg->dma_address = sg_phys(sg);
  64         }
  65
  66         mn10300_dcache_flush_inv();
  67         return nents;
  68 }
  69
  70 static inline
  71 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
  72                   enum dma_data_direction direction)
  73 {
  74         BUG_ON(!valid_dma_direction(direction));
  75 }
  76
  77 static inline
  78 dma_addr_t dma_map_page(struct device *dev, struct page *page,
  79                         unsigned long offset, size_t size,
  80                         enum dma_data_direction direction)
  81 {
  82         BUG_ON(direction == DMA_NONE);
  83         return page_to_bus(page) + offset;
  84 }
  85
  86 static inline
  87 void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
  88                     enum dma_data_direction direction)
  89 {
  90         BUG_ON(direction == DMA_NONE);
  91 }
  92
  93 static inline
  94 void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
  95                              size_t size, enum dma_data_direction direction)
  96 {
  97 }
  98
  99 static inline
 100 void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
 101                                 size_t size, enum dma_data_direction direction)
 102 {
 103         mn10300_dcache_flush_inv();
 104 }
 105
 106 static inline
 107 void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
 108                                    unsigned long offset, size_t size,
 109                                    enum dma_data_direction direction)
 110 {
 111 }
 112
 113 static inline void
 114 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 115                                  unsigned long offset, size_t size,
 116                                  enum dma_data_direction direction)
 117 {
 118         mn10300_dcache_flush_inv();
 119 }
 120
 121
 122 static inline
 123 void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
 124                          int nelems, enum dma_data_direction direction)
 125 {
 126 }
 127
 128 static inline
 129 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
 130                             int nelems, enum dma_data_direction direction)
 131 {
 132         mn10300_dcache_flush_inv();
 133 }
 134
 135 static inline
 136 int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 137 {
 138         return 0;
 139 }
 140
 141 static inline
 142 int dma_supported(struct device *dev, u64 mask)
 143 {
 144         /*
 145          * we fall back to GFP_DMA when the mask isn't all 1s, so we can't
 146          * guarantee allocations that must be within a tighter range than
 147          * GFP_DMA
 148          */
 149         if (mask < 0x00ffffff)
 150                 return 0;
 151         return 1;
 152 }
 153
 154 static inline
 155 int dma_set_mask(struct device *dev, u64 mask)
 156 {
 157         if (!dev->dma_mask || !dma_supported(dev, mask))
 158                 return -EIO;
 159
 160         *dev->dma_mask = mask;
 161         return 0;
 162 }
 163
 164 static inline
 165 void dma_cache_sync(void *vaddr, size_t size,
 166                     enum dma_data_direction direction)
 167 {
 168         mn10300_dcache_flush_inv();
 169 }
 170
 171 #endif