Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 2000 Ani Joshi <ajoshi@unixbox.com> |
| 7 | * Copyright (C) 2000, 2001 Ralf Baechle <ralf@gnu.org> |
| 8 | * swiped from i386, and cloned for MIPS by Geert, polished by Ralf. |
| 9 | */ |
| 10 | #include <linux/types.h> |
| 11 | #include <linux/mm.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/string.h> |
| 14 | #include <linux/pci.h> |
| 15 | |
| 16 | #include <asm/cache.h> |
| 17 | #include <asm/pci/bridge.h> |
| 18 | |
| 19 | #define pdev_to_baddr(pdev, addr) \ |
| 20 | (BRIDGE_CONTROLLER(pdev->bus)->baddr + (addr)) |
| 21 | #define dev_to_baddr(dev, addr) \ |
| 22 | pdev_to_baddr(to_pci_dev(dev), (addr)) |
| 23 | |
| 24 | void *dma_alloc_noncoherent(struct device *dev, size_t size, |
| 25 | dma_addr_t * dma_handle, int gfp) |
| 26 | { |
| 27 | void *ret; |
| 28 | |
| 29 | /* ignore region specifiers */ |
| 30 | gfp &= ~(__GFP_DMA | __GFP_HIGHMEM); |
| 31 | |
| 32 | if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff)) |
| 33 | gfp |= GFP_DMA; |
| 34 | ret = (void *) __get_free_pages(gfp, get_order(size)); |
| 35 | |
| 36 | if (ret != NULL) { |
| 37 | memset(ret, 0, size); |
| 38 | *dma_handle = dev_to_baddr(dev, virt_to_phys(ret)); |
| 39 | } |
| 40 | |
| 41 | return ret; |
| 42 | } |
| 43 | |
| 44 | EXPORT_SYMBOL(dma_alloc_noncoherent); |
| 45 | |
| 46 | void *dma_alloc_coherent(struct device *dev, size_t size, |
| 47 | dma_addr_t * dma_handle, int gfp) |
| 48 | __attribute__((alias("dma_alloc_noncoherent"))); |
| 49 | |
| 50 | EXPORT_SYMBOL(dma_alloc_coherent); |
| 51 | |
| 52 | void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr, |
| 53 | dma_addr_t dma_handle) |
| 54 | { |
| 55 | unsigned long addr = (unsigned long) vaddr; |
| 56 | |
| 57 | free_pages(addr, get_order(size)); |
| 58 | } |
| 59 | |
| 60 | EXPORT_SYMBOL(dma_free_noncoherent); |
| 61 | |
| 62 | void dma_free_coherent(struct device *dev, size_t size, void *vaddr, |
| 63 | dma_addr_t dma_handle) __attribute__((alias("dma_free_noncoherent"))); |
| 64 | |
| 65 | EXPORT_SYMBOL(dma_free_coherent); |
| 66 | |
| 67 | dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size, |
| 68 | enum dma_data_direction direction) |
| 69 | { |
| 70 | BUG_ON(direction == DMA_NONE); |
| 71 | |
| 72 | return dev_to_baddr(dev, __pa(ptr)); |
| 73 | } |
| 74 | |
| 75 | EXPORT_SYMBOL(dma_map_single); |
| 76 | |
| 77 | void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size, |
| 78 | enum dma_data_direction direction) |
| 79 | { |
| 80 | BUG_ON(direction == DMA_NONE); |
| 81 | } |
| 82 | |
| 83 | EXPORT_SYMBOL(dma_unmap_single); |
| 84 | |
| 85 | int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, |
| 86 | enum dma_data_direction direction) |
| 87 | { |
| 88 | int i; |
| 89 | |
| 90 | BUG_ON(direction == DMA_NONE); |
| 91 | |
| 92 | for (i = 0; i < nents; i++, sg++) { |
| 93 | sg->dma_address = (dma_addr_t) dev_to_baddr(dev, |
| 94 | page_to_phys(sg->page) + sg->offset); |
| 95 | } |
| 96 | |
| 97 | return nents; |
| 98 | } |
| 99 | |
| 100 | EXPORT_SYMBOL(dma_map_sg); |
| 101 | |
| 102 | dma_addr_t dma_map_page(struct device *dev, struct page *page, |
| 103 | unsigned long offset, size_t size, enum dma_data_direction direction) |
| 104 | { |
| 105 | BUG_ON(direction == DMA_NONE); |
| 106 | |
| 107 | return dev_to_baddr(dev, page_to_phys(page) + offset); |
| 108 | } |
| 109 | |
| 110 | EXPORT_SYMBOL(dma_map_page); |
| 111 | |
| 112 | void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, |
| 113 | enum dma_data_direction direction) |
| 114 | { |
| 115 | BUG_ON(direction == DMA_NONE); |
| 116 | } |
| 117 | |
| 118 | EXPORT_SYMBOL(dma_unmap_page); |
| 119 | |
| 120 | void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries, |
| 121 | enum dma_data_direction direction) |
| 122 | { |
| 123 | BUG_ON(direction == DMA_NONE); |
| 124 | } |
| 125 | |
| 126 | EXPORT_SYMBOL(dma_unmap_sg); |
| 127 | |
| 128 | void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, |
| 129 | enum dma_data_direction direction) |
| 130 | { |
| 131 | BUG_ON(direction == DMA_NONE); |
| 132 | } |
| 133 | |
| 134 | EXPORT_SYMBOL(dma_sync_single_for_cpu); |
| 135 | |
| 136 | void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size, |
| 137 | enum dma_data_direction direction) |
| 138 | { |
| 139 | BUG_ON(direction == DMA_NONE); |
| 140 | } |
| 141 | |
| 142 | EXPORT_SYMBOL(dma_sync_single_for_device); |
| 143 | |
| 144 | void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle, |
| 145 | unsigned long offset, size_t size, |
| 146 | enum dma_data_direction direction) |
| 147 | { |
| 148 | BUG_ON(direction == DMA_NONE); |
| 149 | } |
| 150 | |
| 151 | EXPORT_SYMBOL(dma_sync_single_range_for_cpu); |
| 152 | |
| 153 | void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, |
| 154 | unsigned long offset, size_t size, |
| 155 | enum dma_data_direction direction) |
| 156 | { |
| 157 | BUG_ON(direction == DMA_NONE); |
| 158 | } |
| 159 | |
| 160 | EXPORT_SYMBOL(dma_sync_single_range_for_device); |
| 161 | |
| 162 | void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, |
| 163 | enum dma_data_direction direction) |
| 164 | { |
| 165 | BUG_ON(direction == DMA_NONE); |
| 166 | } |
| 167 | |
| 168 | EXPORT_SYMBOL(dma_sync_sg_for_cpu); |
| 169 | |
| 170 | void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems, |
| 171 | enum dma_data_direction direction) |
| 172 | { |
| 173 | BUG_ON(direction == DMA_NONE); |
| 174 | } |
| 175 | |
| 176 | EXPORT_SYMBOL(dma_sync_sg_for_device); |
| 177 | |
| 178 | int dma_mapping_error(dma_addr_t dma_addr) |
| 179 | { |
| 180 | return 0; |
| 181 | } |
| 182 | |
| 183 | EXPORT_SYMBOL(dma_mapping_error); |
| 184 | |
| 185 | int dma_supported(struct device *dev, u64 mask) |
| 186 | { |
| 187 | /* |
| 188 | * we fall back to GFP_DMA when the mask isn't all 1s, |
| 189 | * so we can't guarantee allocations that must be |
| 190 | * within a tighter range than GFP_DMA.. |
| 191 | */ |
| 192 | if (mask < 0x00ffffff) |
| 193 | return 0; |
| 194 | |
| 195 | return 1; |
| 196 | } |
| 197 | |
| 198 | EXPORT_SYMBOL(dma_supported); |
| 199 | |
| 200 | int dma_is_consistent(dma_addr_t dma_addr) |
| 201 | { |
| 202 | return 1; |
| 203 | } |
| 204 | |
| 205 | EXPORT_SYMBOL(dma_is_consistent); |
| 206 | |
| 207 | void dma_cache_sync(void *vaddr, size_t size, |
| 208 | enum dma_data_direction direction) |
| 209 | { |
| 210 | BUG_ON(direction == DMA_NONE); |
| 211 | } |
| 212 | |
| 213 | EXPORT_SYMBOL(dma_cache_sync); |
| 214 | |
| 215 | dma64_addr_t pci_dac_page_to_dma(struct pci_dev *pdev, |
| 216 | struct page *page, unsigned long offset, int direction) |
| 217 | { |
| 218 | dma64_addr_t addr = page_to_phys(page) + offset; |
| 219 | |
| 220 | return (dma64_addr_t) pdev_to_baddr(pdev, addr); |
| 221 | } |
| 222 | |
| 223 | EXPORT_SYMBOL(pci_dac_page_to_dma); |
| 224 | |
| 225 | struct page *pci_dac_dma_to_page(struct pci_dev *pdev, |
| 226 | dma64_addr_t dma_addr) |
| 227 | { |
| 228 | struct bridge_controller *bc = BRIDGE_CONTROLLER(pdev->bus); |
| 229 | |
| 230 | return pfn_to_page((dma_addr - bc->baddr) >> PAGE_SHIFT); |
| 231 | } |
| 232 | |
| 233 | EXPORT_SYMBOL(pci_dac_dma_to_page); |
| 234 | |
| 235 | unsigned long pci_dac_dma_to_offset(struct pci_dev *pdev, |
| 236 | dma64_addr_t dma_addr) |
| 237 | { |
| 238 | return dma_addr & ~PAGE_MASK; |
| 239 | } |
| 240 | |
| 241 | EXPORT_SYMBOL(pci_dac_dma_to_offset); |
| 242 | |
| 243 | void pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev, |
| 244 | dma64_addr_t dma_addr, size_t len, int direction) |
| 245 | { |
| 246 | BUG_ON(direction == PCI_DMA_NONE); |
| 247 | } |
| 248 | |
| 249 | EXPORT_SYMBOL(pci_dac_dma_sync_single_for_cpu); |
| 250 | |
| 251 | void pci_dac_dma_sync_single_for_device(struct pci_dev *pdev, |
| 252 | dma64_addr_t dma_addr, size_t len, int direction) |
| 253 | { |
| 254 | BUG_ON(direction == PCI_DMA_NONE); |
| 255 | } |
| 256 | |
| 257 | EXPORT_SYMBOL(pci_dac_dma_sync_single_for_device); |