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/config.h> |
| 11 | #include <linux/types.h> |
Ralf Baechle | 1342f7e | 2005-04-14 12:34:15 +0000 | [diff] [blame] | 12 | #include <linux/dma-mapping.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/mm.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
| 17 | #include <asm/cache.h> |
| 18 | #include <asm/io.h> |
| 19 | |
| 20 | void *dma_alloc_noncoherent(struct device *dev, size_t size, |
Al Viro | 185a8ff | 2005-10-21 03:21:23 -0400 | [diff] [blame] | 21 | dma_addr_t * dma_handle, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | { |
| 23 | void *ret; |
| 24 | /* ignore region specifiers */ |
| 25 | gfp &= ~(__GFP_DMA | __GFP_HIGHMEM); |
| 26 | |
| 27 | if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff)) |
| 28 | gfp |= GFP_DMA; |
| 29 | ret = (void *) __get_free_pages(gfp, get_order(size)); |
| 30 | |
| 31 | if (ret != NULL) { |
| 32 | memset(ret, 0, size); |
| 33 | *dma_handle = virt_to_phys(ret); |
| 34 | } |
| 35 | |
| 36 | return ret; |
| 37 | } |
| 38 | |
| 39 | EXPORT_SYMBOL(dma_alloc_noncoherent); |
| 40 | |
| 41 | void *dma_alloc_coherent(struct device *dev, size_t size, |
Al Viro | 185a8ff | 2005-10-21 03:21:23 -0400 | [diff] [blame] | 42 | dma_addr_t * dma_handle, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | __attribute__((alias("dma_alloc_noncoherent"))); |
| 44 | |
| 45 | EXPORT_SYMBOL(dma_alloc_coherent); |
| 46 | |
| 47 | void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr, |
| 48 | dma_addr_t dma_handle) |
| 49 | { |
| 50 | unsigned long addr = (unsigned long) vaddr; |
| 51 | |
| 52 | free_pages(addr, get_order(size)); |
| 53 | } |
| 54 | |
| 55 | EXPORT_SYMBOL(dma_free_noncoherent); |
| 56 | |
| 57 | void dma_free_coherent(struct device *dev, size_t size, void *vaddr, |
| 58 | dma_addr_t dma_handle) __attribute__((alias("dma_free_noncoherent"))); |
| 59 | |
| 60 | EXPORT_SYMBOL(dma_free_coherent); |
| 61 | |
| 62 | dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size, |
| 63 | enum dma_data_direction direction) |
| 64 | { |
| 65 | BUG_ON(direction == DMA_NONE); |
| 66 | |
| 67 | return __pa(ptr); |
| 68 | } |
| 69 | |
| 70 | EXPORT_SYMBOL(dma_map_single); |
| 71 | |
| 72 | void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size, |
| 73 | enum dma_data_direction direction) |
| 74 | { |
| 75 | BUG_ON(direction == DMA_NONE); |
| 76 | } |
| 77 | |
| 78 | EXPORT_SYMBOL(dma_unmap_single); |
| 79 | |
| 80 | int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, |
| 81 | enum dma_data_direction direction) |
| 82 | { |
| 83 | int i; |
| 84 | |
| 85 | BUG_ON(direction == DMA_NONE); |
| 86 | |
| 87 | for (i = 0; i < nents; i++, sg++) { |
| 88 | sg->dma_address = (dma_addr_t)page_to_phys(sg->page) + sg->offset; |
| 89 | } |
| 90 | |
| 91 | return nents; |
| 92 | } |
| 93 | |
| 94 | EXPORT_SYMBOL(dma_map_sg); |
| 95 | |
| 96 | dma_addr_t dma_map_page(struct device *dev, struct page *page, |
| 97 | unsigned long offset, size_t size, enum dma_data_direction direction) |
| 98 | { |
| 99 | BUG_ON(direction == DMA_NONE); |
| 100 | |
| 101 | return page_to_phys(page) + offset; |
| 102 | } |
| 103 | |
| 104 | EXPORT_SYMBOL(dma_map_page); |
| 105 | |
| 106 | void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, |
| 107 | enum dma_data_direction direction) |
| 108 | { |
| 109 | BUG_ON(direction == DMA_NONE); |
| 110 | } |
| 111 | |
| 112 | EXPORT_SYMBOL(dma_unmap_page); |
| 113 | |
| 114 | void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries, |
| 115 | enum dma_data_direction direction) |
| 116 | { |
| 117 | BUG_ON(direction == DMA_NONE); |
| 118 | } |
| 119 | |
| 120 | EXPORT_SYMBOL(dma_unmap_sg); |
| 121 | |
| 122 | void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, |
| 123 | size_t size, enum dma_data_direction direction) |
| 124 | { |
| 125 | BUG_ON(direction == DMA_NONE); |
| 126 | } |
| 127 | |
| 128 | EXPORT_SYMBOL(dma_sync_single_for_cpu); |
| 129 | |
| 130 | void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, |
| 131 | size_t size, enum dma_data_direction direction) |
| 132 | { |
| 133 | BUG_ON(direction == DMA_NONE); |
| 134 | } |
| 135 | |
| 136 | EXPORT_SYMBOL(dma_sync_single_for_device); |
| 137 | |
| 138 | void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle, |
| 139 | unsigned long offset, size_t size, |
| 140 | enum dma_data_direction direction) |
| 141 | { |
| 142 | BUG_ON(direction == DMA_NONE); |
| 143 | } |
| 144 | |
| 145 | EXPORT_SYMBOL(dma_sync_single_range_for_cpu); |
| 146 | |
| 147 | void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, |
| 148 | unsigned long offset, size_t size, |
| 149 | enum dma_data_direction direction) |
| 150 | { |
| 151 | BUG_ON(direction == DMA_NONE); |
| 152 | } |
| 153 | |
| 154 | EXPORT_SYMBOL(dma_sync_single_range_for_device); |
| 155 | |
| 156 | void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, |
| 157 | enum dma_data_direction direction) |
| 158 | { |
| 159 | BUG_ON(direction == DMA_NONE); |
| 160 | } |
| 161 | |
| 162 | EXPORT_SYMBOL(dma_sync_sg_for_cpu); |
| 163 | |
| 164 | void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems, |
| 165 | enum dma_data_direction direction) |
| 166 | { |
| 167 | BUG_ON(direction == DMA_NONE); |
| 168 | } |
| 169 | |
| 170 | EXPORT_SYMBOL(dma_sync_sg_for_device); |
| 171 | |
| 172 | int dma_mapping_error(dma_addr_t dma_addr) |
| 173 | { |
| 174 | return 0; |
| 175 | } |
| 176 | |
| 177 | EXPORT_SYMBOL(dma_mapping_error); |
| 178 | |
| 179 | int dma_supported(struct device *dev, u64 mask) |
| 180 | { |
| 181 | /* |
| 182 | * we fall back to GFP_DMA when the mask isn't all 1s, |
| 183 | * so we can't guarantee allocations that must be |
| 184 | * within a tighter range than GFP_DMA.. |
| 185 | */ |
| 186 | if (mask < 0x00ffffff) |
| 187 | return 0; |
| 188 | |
| 189 | return 1; |
| 190 | } |
| 191 | |
| 192 | EXPORT_SYMBOL(dma_supported); |
| 193 | |
| 194 | int dma_is_consistent(dma_addr_t dma_addr) |
| 195 | { |
| 196 | return 1; |
| 197 | } |
| 198 | |
| 199 | EXPORT_SYMBOL(dma_is_consistent); |
| 200 | |
| 201 | void dma_cache_sync(void *vaddr, size_t size, |
| 202 | enum dma_data_direction direction) |
| 203 | { |
| 204 | BUG_ON(direction == DMA_NONE); |
| 205 | } |
| 206 | |
| 207 | EXPORT_SYMBOL(dma_cache_sync); |
| 208 | |
| 209 | /* The DAC routines are a PCIism.. */ |
| 210 | |
| 211 | #ifdef CONFIG_PCI |
| 212 | |
| 213 | #include <linux/pci.h> |
| 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 | return (dma64_addr_t)page_to_phys(page) + offset; |
| 219 | } |
| 220 | |
| 221 | EXPORT_SYMBOL(pci_dac_page_to_dma); |
| 222 | |
| 223 | struct page *pci_dac_dma_to_page(struct pci_dev *pdev, |
| 224 | dma64_addr_t dma_addr) |
| 225 | { |
| 226 | return mem_map + (dma_addr >> PAGE_SHIFT); |
| 227 | } |
| 228 | |
| 229 | EXPORT_SYMBOL(pci_dac_dma_to_page); |
| 230 | |
| 231 | unsigned long pci_dac_dma_to_offset(struct pci_dev *pdev, |
| 232 | dma64_addr_t dma_addr) |
| 233 | { |
| 234 | return dma_addr & ~PAGE_MASK; |
| 235 | } |
| 236 | |
| 237 | EXPORT_SYMBOL(pci_dac_dma_to_offset); |
| 238 | |
| 239 | void pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev, |
| 240 | dma64_addr_t dma_addr, size_t len, int direction) |
| 241 | { |
| 242 | BUG_ON(direction == PCI_DMA_NONE); |
| 243 | } |
| 244 | |
| 245 | EXPORT_SYMBOL(pci_dac_dma_sync_single_for_cpu); |
| 246 | |
| 247 | void pci_dac_dma_sync_single_for_device(struct pci_dev *pdev, |
| 248 | dma64_addr_t dma_addr, size_t len, int direction) |
| 249 | { |
| 250 | BUG_ON(direction == PCI_DMA_NONE); |
| 251 | } |
| 252 | |
| 253 | EXPORT_SYMBOL(pci_dac_dma_sync_single_for_device); |
| 254 | |
| 255 | #endif /* CONFIG_PCI */ |