arch/mips/mm/dma-ip27.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/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);