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 static void *ia64_swiotlb_alloc_coherent(struct device *dev, size_t size,
  17                                          dma_addr_t *dma_handle, gfp_t gfp)
  18 {
  19         if (dev->coherent_dma_mask != DMA_BIT_MASK(64))
  20                 gfp |= GFP_DMA;
  21         return swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
  22 }
  23
  24 struct dma_map_ops swiotlb_dma_ops = {
  25         .alloc_coherent = ia64_swiotlb_alloc_coherent,
  26         .free_coherent = swiotlb_free_coherent,
  27         .map_page = swiotlb_map_page,
  28         .unmap_page = swiotlb_unmap_page,
  29         .map_sg = swiotlb_map_sg_attrs,
  30         .unmap_sg = swiotlb_unmap_sg_attrs,
  31         .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
  32         .sync_single_for_device = swiotlb_sync_single_for_device,
  33         .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu,
  34         .sync_single_range_for_device = swiotlb_sync_single_range_for_device,
  35         .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
  36         .sync_sg_for_device = swiotlb_sync_sg_for_device,
  37         .dma_supported = swiotlb_dma_supported,
  38         .mapping_error = swiotlb_dma_mapping_error,
  39 };
  40
  41 void __init swiotlb_dma_init(void)
  42 {
  43         dma_ops = &swiotlb_dma_ops;
  44         swiotlb_init();
  45 }
  46
  47 void __init pci_swiotlb_init(void)
  48 {
  49         if (!iommu_detected || iommu_pass_through) {
  50 #ifdef CONFIG_IA64_GENERIC
  51                 swiotlb = 1;
  52                 printk(KERN_INFO "PCI-DMA: Re-initialize machine vector.\n");
  53                 machvec_init("dig");
  54                 swiotlb_init();
  55                 dma_ops = &swiotlb_dma_ops;
  56 #else
  57                 panic("Unable to find Intel IOMMU");
  58 #endif
  59         }
  60 }