arch/ia64/kernel/pci-swiotlb.c

   1 /* Glue code to lib/swiotlb.c */
   2
   3 #include <linux/pci.h>
   4 #include <linux/cache.h>
   5 #include <linux/module.h>
   6 #include <linux/dma-mapping.h>
   7
   8 #include <asm/swiotlb.h>
   9 #include <asm/dma.h>
  10 #include <asm/iommu.h>
  11 #include <asm/machvec.h>
  12
  13 int swiotlb __read_mostly;
  14 EXPORT_SYMBOL(swiotlb);
  15
  16 /* Set this to 1 if there is a HW IOMMU in the system */
  17 int iommu_detected __read_mostly;
  18
  19 static dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
  20                                    unsigned long offset, size_t size,
  21                                    enum dma_data_direction dir,
  22                                    struct dma_attrs *attrs)
  23 {
  24         return swiotlb_map_single_attrs(dev, page_address(page) + offset, size,
  25                                         dir, attrs);
  26 }
  27
  28 static void swiotlb_unmap_page(struct device *dev, dma_addr_t dma_handle,
  29                                size_t size, enum dma_data_direction dir,
  30                                struct dma_attrs *attrs)
  31 {
  32         swiotlb_unmap_single_attrs(dev, dma_handle, size, dir, attrs);
  33 }
  34
  35 struct dma_map_ops swiotlb_dma_ops = {
  36         .alloc_coherent = swiotlb_alloc_coherent,
  37         .free_coherent = swiotlb_free_coherent,
  38         .map_page = swiotlb_map_page,
  39         .unmap_page = swiotlb_unmap_page,
  40         .map_sg = swiotlb_map_sg_attrs,
  41         .unmap_sg = swiotlb_unmap_sg_attrs,
  42         .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
  43         .sync_single_for_device = swiotlb_sync_single_for_device,
  44         .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu,
  45         .sync_single_range_for_device = swiotlb_sync_single_range_for_device,
  46         .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
  47         .sync_sg_for_device = swiotlb_sync_sg_for_device,
  48         .dma_supported = swiotlb_dma_supported,
  49         .mapping_error = swiotlb_dma_mapping_error,
  50 };
  51
  52 void swiotlb_dma_init(void)
  53 {
  54         dma_ops = &swiotlb_dma_ops;
  55         swiotlb_init();
  56 }
  57
  58 void __init pci_swiotlb_init(void)
  59 {
  60         if (!iommu_detected) {
  61 #ifdef CONFIG_IA64_GENERIC
  62                 swiotlb = 1;
  63                 printk(KERN_INFO "PCI-DMA: Re-initialize machine vector.\n");
  64                 machvec_init("dig");
  65                 swiotlb_init();
  66                 dma_ops = &swiotlb_dma_ops;
  67 #else
  68                 panic("Unable to find Intel IOMMU");
  69 #endif
  70         }
  71 }