kernel/arch/ia64/kernel/pci-swiotlb.c

   1 /* Glue code to lib/swiotlb.c */
   2
   3 #include <linux/pci.h>
   4 #include <linux/gfp.h>
   5 #include <linux/cache.h>
   6 #include <linux/module.h>
   7 #include <linux/dma-mapping.h>
   8
   9 #include <asm/swiotlb.h>
  10 #include <asm/dma.h>
  11 #include <asm/iommu.h>
  12 #include <asm/machvec.h>
  13
  14 int swiotlb __read_mostly;
  15 EXPORT_SYMBOL(swiotlb);
  16
  17 static void *ia64_swiotlb_alloc_coherent(struct device *dev, size_t size,
  18                                          dma_addr_t *dma_handle, gfp_t gfp,
  19                                          struct dma_attrs *attrs)
  20 {
  21         if (dev->coherent_dma_mask != DMA_BIT_MASK(64))
  22                 gfp |= GFP_DMA;
  23         return swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
  24 }
  25
  26 static void ia64_swiotlb_free_coherent(struct device *dev, size_t size,
  27                                        void *vaddr, dma_addr_t dma_addr,
  28                                        struct dma_attrs *attrs)
  29 {
  30         swiotlb_free_coherent(dev, size, vaddr, dma_addr);
  31 }
  32
  33 struct dma_map_ops swiotlb_dma_ops = {
  34         .alloc = ia64_swiotlb_alloc_coherent,
  35         .free = ia64_swiotlb_free_coherent,
  36         .map_page = swiotlb_map_page,
  37         .unmap_page = swiotlb_unmap_page,
  38         .map_sg = swiotlb_map_sg_attrs,
  39         .unmap_sg = swiotlb_unmap_sg_attrs,
  40         .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
  41         .sync_single_for_device = swiotlb_sync_single_for_device,
  42         .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
  43         .sync_sg_for_device = swiotlb_sync_sg_for_device,
  44         .dma_supported = swiotlb_dma_supported,
  45         .mapping_error = swiotlb_dma_mapping_error,
  46 };
  47
  48 void __init swiotlb_dma_init(void)
  49 {
  50         dma_ops = &swiotlb_dma_ops;
  51         swiotlb_init(1);
  52 }
  53
  54 void __init pci_swiotlb_init(void)
  55 {
  56         if (!iommu_detected) {
  57 #ifdef CONFIG_IA64_GENERIC
  58                 swiotlb = 1;
  59                 printk(KERN_INFO "PCI-DMA: Re-initialize machine vector.\n");
  60                 machvec_init("dig");
  61                 swiotlb_init(1);
  62                 dma_ops = &swiotlb_dma_ops;
  63 #else
  64                 panic("Unable to find Intel IOMMU");
  65 #endif
  66         }
  67 }