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
ia64_swiotlb_alloc_coherent(struct device * dev,size_t size,dma_addr_t * dma_handle,gfp_t gfp,struct dma_attrs * attrs)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
ia64_swiotlb_free_coherent(struct device * dev,size_t size,void * vaddr,dma_addr_t dma_addr,struct dma_attrs * attrs)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
swiotlb_dma_init(void)48 void __init swiotlb_dma_init(void)
49 {
50 dma_ops = &swiotlb_dma_ops;
51 swiotlb_init(1);
52 }
53
pci_swiotlb_init(void)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 }
68