arch/x86/kernel/pci-base_32.c

   1 #include <linux/mm.h>
   2 #include <linux/kernel.h>
   3 #include <linux/module.h>
   4 #include <linux/dma-mapping.h>
   5 #include <asm/dma-mapping.h>
   6
   7 static dma_addr_t pci32_map_single(struct device *dev, phys_addr_t ptr,
   8                                    size_t size, int direction)
   9 {
  10         WARN_ON(size == 0);
  11         flush_write_buffers();
  12         return ptr;
  13 }
  14
  15 static int pci32_dma_map_sg(struct device *dev, struct scatterlist *sglist,
  16                             int nents, int direction)
  17 {
  18         struct scatterlist *sg;
  19         int i;
  20
  21         WARN_ON(nents == 0 || sglist[0].length == 0);
  22
  23         for_each_sg(sglist, sg, nents, i) {
  24                 BUG_ON(!sg_page(sg));
  25
  26                 sg->dma_address = sg_phys(sg);
  27         }
  28
  29         flush_write_buffers();
  30         return nents;
  31 }
  32
  33 static const struct dma_mapping_ops pci32_dma_ops = {
  34         .map_single = pci32_map_single,
  35         .unmap_single = NULL,
  36         .map_sg = pci32_dma_map_sg,
  37         .unmap_sg = NULL,
  38         .sync_single_for_cpu = NULL,
  39         .sync_single_for_device = NULL,
  40         .sync_single_range_for_cpu = NULL,
  41         .sync_single_range_for_device = NULL,
  42         .sync_sg_for_cpu = NULL,
  43         .sync_sg_for_device = NULL,
  44 };
  45
  46 const struct dma_mapping_ops *dma_ops = &pci32_dma_ops;
  47 EXPORT_SYMBOL(dma_ops);