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 static void *dma32_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
  48 static void dma32_free_coherent(struct device *dev, size_t size,
  49                                 void *cpu_addr, dma_addr_t dma_handle)
  50 {
  51 #ifdef CONFIG_PCI
  52         if (dev->bus == &pci_bus_type) {
  53                 pci_free_consistent(to_pci_dev(dev), size,
  54                                     cpu_addr, dma_handle);
  55                 return;
  56         }
  57 #endif
  58         sbus_free_consistent(dev, size, cpu_addr, dma_handle);
  59 }
  60
  61 static dma_addr_t dma32_map_page(struct device *dev, struct page *page,
  62                                  unsigned long offset, size_t size,
  63                                  enum dma_data_direction direction)
  64 {
  65 #ifdef CONFIG_PCI
  66         if (dev->bus == &pci_bus_type)
  67                 return pci_map_page(to_pci_dev(dev), page, offset,
  68                                     size, (int)direction);
  69 #endif
  70         return sbus_map_single(dev, page_address(page) + offset,
  71                                size, (int)direction);
  72 }
  73
  74 static void dma32_unmap_page(struct device *dev, dma_addr_t dma_address,
  75                              size_t size, enum dma_data_direction direction)
  76 {
  77 #ifdef CONFIG_PCI
  78         if (dev->bus == &pci_bus_type) {
  79                 pci_unmap_page(to_pci_dev(dev), dma_address,
  80                                size, (int)direction);
  81                 return;
  82         }
  83 #endif
  84         sbus_unmap_single(dev, dma_address, size, (int)direction);
  85 }
  86
  87 static int dma32_map_sg(struct device *dev, struct scatterlist *sg,
  88                         int nents, enum dma_data_direction direction)
  89 {
  90 #ifdef CONFIG_PCI
  91         if (dev->bus == &pci_bus_type)
  92                 return pci_map_sg(to_pci_dev(dev), sg, nents, (int)direction);
  93 #endif
  94         return sbus_map_sg(dev, sg, nents, direction);
  95 }
  96
  97 void dma32_unmap_sg(struct device *dev, struct scatterlist *sg,
  98                     int nents, enum dma_data_direction direction)
  99 {
 100 #ifdef CONFIG_PCI
 101         if (dev->bus == &pci_bus_type) {
 102                 pci_unmap_sg(to_pci_dev(dev), sg, nents, (int)direction);
 103                 return;
 104         }
 105 #endif
 106         sbus_unmap_sg(dev, sg, nents, (int)direction);
 107 }
 108
 109 static void dma32_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
 110                                       size_t size,
 111                                       enum dma_data_direction direction)
 112 {
 113 #ifdef CONFIG_PCI
 114         if (dev->bus == &pci_bus_type) {
 115                 pci_dma_sync_single_for_cpu(to_pci_dev(dev), dma_handle,
 116                                             size, (int)direction);
 117                 return;
 118         }
 119 #endif
 120         sbus_dma_sync_single_for_cpu(dev, dma_handle, size, (int) direction);
 121 }
 122
 123 static void dma32_sync_single_for_device(struct device *dev,
 124                                          dma_addr_t dma_handle, size_t size,
 125                                          enum dma_data_direction direction)
 126 {
 127 #ifdef CONFIG_PCI
 128         if (dev->bus == &pci_bus_type) {
 129                 pci_dma_sync_single_for_device(to_pci_dev(dev), dma_handle,
 130                                                size, (int)direction);
 131                 return;
 132         }
 133 #endif
 134         sbus_dma_sync_single_for_device(dev, dma_handle, size, (int) direction);
 135 }
 136
 137 static void dma32_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
 138                                   int nelems, enum dma_data_direction direction)
 139 {
 140 #ifdef CONFIG_PCI
 141         if (dev->bus == &pci_bus_type) {
 142                 pci_dma_sync_sg_for_cpu(to_pci_dev(dev), sg,
 143                                         nelems, (int)direction);
 144                 return;
 145         }
 146 #endif
 147         BUG();
 148 }
 149
 150 static void dma32_sync_sg_for_device(struct device *dev,
 151                                      struct scatterlist *sg, int nelems,
 152                                      enum dma_data_direction direction)
 153 {
 154 #ifdef CONFIG_PCI
 155         if (dev->bus == &pci_bus_type) {
 156                 pci_dma_sync_sg_for_device(to_pci_dev(dev), sg,
 157                                            nelems, (int)direction);
 158                 return;
 159         }
 160 #endif
 161         BUG();
 162 }
 163
 164 static const struct dma_ops dma32_dma_ops = {
 165         .alloc_coherent         = dma32_alloc_coherent,
 166         .free_coherent          = dma32_free_coherent,
 167         .map_page               = dma32_map_page,
 168         .unmap_page             = dma32_unmap_page,
 169         .map_sg                 = dma32_map_sg,
 170         .unmap_sg               = dma32_unmap_sg,
 171         .sync_single_for_cpu    = dma32_sync_single_for_cpu,
 172         .sync_single_for_device = dma32_sync_single_for_device,
 173         .sync_sg_for_cpu        = dma32_sync_sg_for_cpu,
 174         .sync_sg_for_device     = dma32_sync_sg_for_device,
 175 };
 176
 177 const struct dma_ops *dma_ops = &dma32_dma_ops;
 178 EXPORT_SYMBOL(dma_ops);