arch/sparc/kernel/dma.c

   1 /* dma.c: PCI and SBUS DMA accessors for 32-bit sparc.
   2  *
   3  * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
   4  */
   5
   6 #include <linux/kernel.h>
   7 #include <linux/module.h>
   8 #include <linux/dma-mapping.h>
   9 #include <linux/scatterlist.h>
  10 #include <linux/mm.h>
  11
  12 #ifdef CONFIG_PCI
  13 #include <linux/pci.h>
  14 #endif
  15
  16 #include "dma.h"
  17
  18 int dma_supported(struct device *dev, u64 mask)
  19 {
  20 #ifdef CONFIG_PCI
  21         if (dev->bus == &pci_bus_type)
  22                 return pci_dma_supported(to_pci_dev(dev), mask);
  23 #endif
  24         return 0;
  25 }
  26 EXPORT_SYMBOL(dma_supported);
  27
  28 int dma_set_mask(struct device *dev, u64 dma_mask)
  29 {
  30 #ifdef CONFIG_PCI
  31         if (dev->bus == &pci_bus_type)
  32                 return pci_set_dma_mask(to_pci_dev(dev), dma_mask);
  33 #endif
  34         return -EOPNOTSUPP;
  35 }
  36 EXPORT_SYMBOL(dma_set_mask);
  37
  38 void *dma_alloc_coherent(struct device *dev, size_t size,
  39                          dma_addr_t *dma_handle, gfp_t flag)
  40 {
  41 #ifdef CONFIG_PCI
  42         if (dev->bus == &pci_bus_type)
  43                 return pci_alloc_consistent(to_pci_dev(dev), size, dma_handle);
  44 #endif
  45         return sbus_alloc_consistent(dev, size, dma_handle);
  46 }
  47 EXPORT_SYMBOL(dma_alloc_coherent);
  48
  49 void dma_free_coherent(struct device *dev, size_t size,
  50                        void *cpu_addr, dma_addr_t dma_handle)
  51 {
  52 #ifdef CONFIG_PCI
  53         if (dev->bus == &pci_bus_type) {
  54                 pci_free_consistent(to_pci_dev(dev), size,
  55                                     cpu_addr, dma_handle);
  56                 return;
  57         }
  58 #endif
  59         sbus_free_consistent(dev, size, cpu_addr, dma_handle);
  60 }
  61 EXPORT_SYMBOL(dma_free_coherent);
  62
  63 dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
  64                           size_t size, enum dma_data_direction direction)
  65 {
  66 #ifdef CONFIG_PCI
  67         if (dev->bus == &pci_bus_type)
  68                 return pci_map_single(to_pci_dev(dev), cpu_addr,
  69                                       size, (int)direction);
  70 #endif
  71         return sbus_map_single(dev, cpu_addr, size, (int)direction);
  72 }
  73 EXPORT_SYMBOL(dma_map_single);
  74
  75 void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
  76                       size_t size,
  77                       enum dma_data_direction direction)
  78 {
  79 #ifdef CONFIG_PCI
  80         if (dev->bus == &pci_bus_type) {
  81                 pci_unmap_single(to_pci_dev(dev), dma_addr,
  82                                  size, (int)direction);
  83                 return;
  84         }
  85 #endif
  86         sbus_unmap_single(dev, dma_addr, size, (int)direction);
  87 }
  88 EXPORT_SYMBOL(dma_unmap_single);
  89
  90 dma_addr_t dma_map_page(struct device *dev, struct page *page,
  91                         unsigned long offset, size_t size,
  92                         enum dma_data_direction direction)
  93 {
  94 #ifdef CONFIG_PCI
  95         if (dev->bus == &pci_bus_type)
  96                 return pci_map_page(to_pci_dev(dev), page, offset,
  97                                     size, (int)direction);
  98 #endif
  99         return sbus_map_single(dev, page_address(page) + offset,
 100                                size, (int)direction);
 101 }
 102 EXPORT_SYMBOL(dma_map_page);
 103
 104 void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
 105                     size_t size, enum dma_data_direction direction)
 106 {
 107 #ifdef CONFIG_PCI
 108         if (dev->bus == &pci_bus_type) {
 109                 pci_unmap_page(to_pci_dev(dev), dma_address,
 110                                size, (int)direction);
 111                 return;
 112         }
 113 #endif
 114         sbus_unmap_single(dev, dma_address, size, (int)direction);
 115 }
 116 EXPORT_SYMBOL(dma_unmap_page);
 117
 118 int dma_map_sg(struct device *dev, struct scatterlist *sg,
 119                              int nents, enum dma_data_direction direction)
 120 {
 121 #ifdef CONFIG_PCI
 122         if (dev->bus == &pci_bus_type)
 123                 return pci_map_sg(to_pci_dev(dev), sg, nents, (int)direction);
 124 #endif
 125         return sbus_map_sg(dev, sg, nents, direction);
 126 }
 127 EXPORT_SYMBOL(dma_map_sg);
 128
 129 void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
 130                   int nents, enum dma_data_direction direction)
 131 {
 132 #ifdef CONFIG_PCI
 133         if (dev->bus == &pci_bus_type) {
 134                 pci_unmap_sg(to_pci_dev(dev), sg, nents, (int)direction);
 135                 return;
 136         }
 137 #endif
 138         sbus_unmap_sg(dev, sg, nents, (int)direction);
 139 }
 140 EXPORT_SYMBOL(dma_unmap_sg);
 141
 142 void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
 143                              size_t size, enum dma_data_direction direction)
 144 {
 145 #ifdef CONFIG_PCI
 146         if (dev->bus == &pci_bus_type) {
 147                 pci_dma_sync_single_for_cpu(to_pci_dev(dev), dma_handle,
 148                                             size, (int)direction);
 149                 return;
 150         }
 151 #endif
 152         sbus_dma_sync_single_for_cpu(dev, dma_handle, size, (int) direction);
 153 }
 154 EXPORT_SYMBOL(dma_sync_single_for_cpu);
 155
 156 void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
 157                                 size_t size, enum dma_data_direction direction)
 158 {
 159 #ifdef CONFIG_PCI
 160         if (dev->bus == &pci_bus_type) {
 161                 pci_dma_sync_single_for_device(to_pci_dev(dev), dma_handle,
 162                                                size, (int)direction);
 163                 return;
 164         }
 165 #endif
 166         sbus_dma_sync_single_for_device(dev, dma_handle, size, (int) direction);
 167 }
 168 EXPORT_SYMBOL(dma_sync_single_for_device);
 169
 170 void dma_sync_single_range_for_cpu(struct device *dev,
 171                                    dma_addr_t dma_handle,
 172                                    unsigned long offset,
 173                                    size_t size,
 174                                    enum dma_data_direction direction)
 175 {
 176         dma_sync_single_for_cpu(dev, dma_handle+offset, size, direction);
 177 }
 178 EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
 179
 180 void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
 181                                       unsigned long offset, size_t size,
 182                                       enum dma_data_direction direction)
 183 {
 184         dma_sync_single_for_device(dev, dma_handle+offset, size, direction);
 185 }
 186 EXPORT_SYMBOL(dma_sync_single_range_for_device);
 187
 188 void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
 189                          int nelems, enum dma_data_direction direction)
 190 {
 191 #ifdef CONFIG_PCI
 192         if (dev->bus == &pci_bus_type) {
 193                 pci_dma_sync_sg_for_cpu(to_pci_dev(dev), sg,
 194                                         nelems, (int)direction);
 195                 return;
 196         }
 197 #endif
 198         BUG();
 199 }
 200 EXPORT_SYMBOL(dma_sync_sg_for_cpu);
 201
 202 void dma_sync_sg_for_device(struct device *dev,
 203                             struct scatterlist *sg, int nelems,
 204                             enum dma_data_direction direction)
 205 {
 206 #ifdef CONFIG_PCI
 207         if (dev->bus == &pci_bus_type) {
 208                 pci_dma_sync_sg_for_device(to_pci_dev(dev), sg,
 209                                            nelems, (int)direction);
 210                 return;
 211         }
 212 #endif
 213         BUG();
 214 }
 215 EXPORT_SYMBOL(dma_sync_sg_for_device);
 216
 217 int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 218 {
 219         return (dma_addr == DMA_ERROR_CODE);
 220 }
 221 EXPORT_SYMBOL(dma_mapping_error);
 222
 223 int dma_get_cache_alignment(void)
 224 {
 225         return 32;
 226 }
 227 EXPORT_SYMBOL(dma_get_cache_alignment);