arch/ppc64/kernel/dma.c

   1 /*
   2  * Copyright (C) 2004 IBM Corporation
   3  *
   4  * Implements the generic device dma API for ppc64. Handles
   5  * the pci and vio busses
   6  */
   7
   8 #include <linux/device.h>
   9 #include <linux/dma-mapping.h>
  10 /* Include the busses we support */
  11 #include <linux/pci.h>
  12 #include <asm/vio.h>
  13 #include <asm/scatterlist.h>
  14 #include <asm/bug.h>
  15
  16 static struct dma_mapping_ops *get_dma_ops(struct device *dev)
  17 {
  18         if (dev->bus == &pci_bus_type)
  19                 return &pci_dma_ops;
  20 #ifdef CONFIG_IBMVIO
  21         if (dev->bus == &vio_bus_type)
  22                 return &vio_dma_ops;
  23 #endif
  24         return NULL;
  25 }
  26
  27 int dma_supported(struct device *dev, u64 mask)
  28 {
  29         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
  30
  31         if (dma_ops)
  32                 return dma_ops->dma_supported(dev, mask);
  33         BUG();
  34         return 0;
  35 }
  36 EXPORT_SYMBOL(dma_supported);
  37
  38 int dma_set_mask(struct device *dev, u64 dma_mask)
  39 {
  40         if (dev->bus == &pci_bus_type)
  41                 return pci_set_dma_mask(to_pci_dev(dev), dma_mask);
  42 #ifdef CONFIG_IBMVIO
  43         if (dev->bus == &vio_bus_type)
  44                 return -EIO;
  45 #endif /* CONFIG_IBMVIO */
  46         BUG();
  47         return 0;
  48 }
  49 EXPORT_SYMBOL(dma_set_mask);
  50
  51 void *dma_alloc_coherent(struct device *dev, size_t size,
  52                 dma_addr_t *dma_handle, unsigned int __nocast flag)
  53 {
  54         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
  55
  56         if (dma_ops)
  57                 return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
  58         BUG();
  59         return NULL;
  60 }
  61 EXPORT_SYMBOL(dma_alloc_coherent);
  62
  63 void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
  64                 dma_addr_t dma_handle)
  65 {
  66         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
  67
  68         if (dma_ops)
  69                 dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
  70         else
  71                 BUG();
  72 }
  73 EXPORT_SYMBOL(dma_free_coherent);
  74
  75 dma_addr_t dma_map_single(struct device *dev, void *cpu_addr, size_t size,
  76                 enum dma_data_direction direction)
  77 {
  78         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
  79
  80         if (dma_ops)
  81                 return dma_ops->map_single(dev, cpu_addr, size, direction);
  82         BUG();
  83         return (dma_addr_t)0;
  84 }
  85 EXPORT_SYMBOL(dma_map_single);
  86
  87 void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
  88                 enum dma_data_direction direction)
  89 {
  90         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
  91
  92         if (dma_ops)
  93                 dma_ops->unmap_single(dev, dma_addr, size, direction);
  94         else
  95                 BUG();
  96 }
  97 EXPORT_SYMBOL(dma_unmap_single);
  98
  99 dma_addr_t dma_map_page(struct device *dev, struct page *page,
 100                 unsigned long offset, size_t size,
 101                 enum dma_data_direction direction)
 102 {
 103         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 104
 105         if (dma_ops)
 106                 return dma_ops->map_single(dev,
 107                                 (page_address(page) + offset), size, direction);
 108         BUG();
 109         return (dma_addr_t)0;
 110 }
 111 EXPORT_SYMBOL(dma_map_page);
 112
 113 void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
 114                 enum dma_data_direction direction)
 115 {
 116         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 117
 118         if (dma_ops)
 119                 dma_ops->unmap_single(dev, dma_address, size, direction);
 120         else
 121                 BUG();
 122 }
 123 EXPORT_SYMBOL(dma_unmap_page);
 124
 125 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 126                 enum dma_data_direction direction)
 127 {
 128         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 129
 130         if (dma_ops)
 131                 return dma_ops->map_sg(dev, sg, nents, direction);
 132         BUG();
 133         return 0;
 134 }
 135 EXPORT_SYMBOL(dma_map_sg);
 136
 137 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
 138                 enum dma_data_direction direction)
 139 {
 140         struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
 141
 142         if (dma_ops)
 143                 dma_ops->unmap_sg(dev, sg, nhwentries, direction);
 144         else
 145                 BUG();
 146 }
 147 EXPORT_SYMBOL(dma_unmap_sg);