arch/mips/mm/dma-coherent.c

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