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);
40 return dma_ops->dma_supported(dev, mask);
42 EXPORT_SYMBOL(dma_supported);
44 int dma_set_mask(struct device *dev, u64 dma_mask)
47 if (dev->bus == &pci_bus_type)
48 return pci_set_dma_mask(to_pci_dev(dev), dma_mask);
51 if (dev->bus == &vio_bus_type)
53 #endif /* CONFIG_IBMVIO */
55 if (dev->bus == &ibmebus_bus_type)
61 EXPORT_SYMBOL(dma_set_mask);
63 void *dma_alloc_coherent(struct device *dev, size_t size,
64 dma_addr_t *dma_handle, gfp_t flag)
66 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
70 return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
72 EXPORT_SYMBOL(dma_alloc_coherent);
74 void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
75 dma_addr_t dma_handle)
77 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
81 dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
83 EXPORT_SYMBOL(dma_free_coherent);
85 dma_addr_t dma_map_single(struct device *dev, void *cpu_addr, size_t size,
86 enum dma_data_direction direction)
88 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
92 return dma_ops->map_single(dev, cpu_addr, size, direction);
94 EXPORT_SYMBOL(dma_map_single);
96 void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
97 enum dma_data_direction direction)
99 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
103 dma_ops->unmap_single(dev, dma_addr, size, direction);
105 EXPORT_SYMBOL(dma_unmap_single);
107 dma_addr_t dma_map_page(struct device *dev, struct page *page,
108 unsigned long offset, size_t size,
109 enum dma_data_direction direction)
111 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
115 return dma_ops->map_single(dev, page_address(page) + offset, size,
118 EXPORT_SYMBOL(dma_map_page);
120 void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
121 enum dma_data_direction direction)
123 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
127 dma_ops->unmap_single(dev, dma_address, size, direction);
129 EXPORT_SYMBOL(dma_unmap_page);
131 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
132 enum dma_data_direction direction)
134 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
138 return dma_ops->map_sg(dev, sg, nents, direction);
140 EXPORT_SYMBOL(dma_map_sg);
142 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
143 enum dma_data_direction direction)
145 struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
149 dma_ops->unmap_sg(dev, sg, nhwentries, direction);
151 EXPORT_SYMBOL(dma_unmap_sg);