2 * Copyright (C) 2004 IBM Corporation
4 * Implements the generic device dma API for ppc64. Handles
5 * the pci and vio busses
8 #include <linux/device.h>
9 #include <linux/dma-mapping.h>
10 /* Include the busses we support */
11 #include <linux/pci.h>
13 #include <asm/ibmebus.h>
14 #include <asm/scatterlist.h>
17 static struct dma_mapping_ops *get_dma_ops(struct device *dev)
20 if (dev->bus == &pci_bus_type)
24 if (dev->bus == &vio_bus_type)
28 if (dev->bus == &ibmebus_bus_type)
29 return &ibmebus_dma_ops;
34 int dma_supported(struct device *dev, u64 mask)
36 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
39 return dma_ops->dma_supported(dev, mask);
43 EXPORT_SYMBOL(dma_supported);
45 int dma_set_mask(struct device *dev, u64 dma_mask)
48 if (dev->bus == &pci_bus_type)
49 return pci_set_dma_mask(to_pci_dev(dev), dma_mask);
52 if (dev->bus == &vio_bus_type)
54 #endif /* CONFIG_IBMVIO */
56 if (dev->bus == &ibmebus_bus_type)
62 EXPORT_SYMBOL(dma_set_mask);
64 void *dma_alloc_coherent(struct device *dev, size_t size,
65 dma_addr_t *dma_handle, gfp_t flag)
67 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
70 return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
74 EXPORT_SYMBOL(dma_alloc_coherent);
76 void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
77 dma_addr_t dma_handle)
79 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
82 dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
86 EXPORT_SYMBOL(dma_free_coherent);
88 dma_addr_t dma_map_single(struct device *dev, void *cpu_addr, size_t size,
89 enum dma_data_direction direction)
91 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
94 return dma_ops->map_single(dev, cpu_addr, size, direction);
98 EXPORT_SYMBOL(dma_map_single);
100 void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
101 enum dma_data_direction direction)
103 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
106 dma_ops->unmap_single(dev, dma_addr, size, direction);
110 EXPORT_SYMBOL(dma_unmap_single);
112 dma_addr_t dma_map_page(struct device *dev, struct page *page,
113 unsigned long offset, size_t size,
114 enum dma_data_direction direction)
116 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
119 return dma_ops->map_single(dev,
120 (page_address(page) + offset), size, direction);
122 return (dma_addr_t)0;
124 EXPORT_SYMBOL(dma_map_page);
126 void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
127 enum dma_data_direction direction)
129 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
132 dma_ops->unmap_single(dev, dma_address, size, direction);
136 EXPORT_SYMBOL(dma_unmap_page);
138 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
139 enum dma_data_direction direction)
141 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
144 return dma_ops->map_sg(dev, sg, nents, direction);
148 EXPORT_SYMBOL(dma_map_sg);
150 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
151 enum dma_data_direction direction)
153 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
156 dma_ops->unmap_sg(dev, sg, nhwentries, direction);
160 EXPORT_SYMBOL(dma_unmap_sg);