| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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); |