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