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/proto.h>
9#include <asm/swiotlb.h>
10#include <asm/dma.h>
11
12int swiotlb __read_mostly;
13EXPORT_SYMBOL(swiotlb);
14
15const struct dma_mapping_ops swiotlb_dma_ops = {
16	.mapping_error = swiotlb_dma_mapping_error,
17	.alloc_coherent = swiotlb_alloc_coherent,
18	.free_coherent = swiotlb_free_coherent,
19	.map_single = swiotlb_map_single,
20	.unmap_single = swiotlb_unmap_single,
21	.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
22	.sync_single_for_device = swiotlb_sync_single_for_device,
23	.sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu,
24	.sync_single_range_for_device = swiotlb_sync_single_range_for_device,
25	.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
26	.sync_sg_for_device = swiotlb_sync_sg_for_device,
27	.map_sg = swiotlb_map_sg,
28	.unmap_sg = swiotlb_unmap_sg,
29	.dma_supported = NULL,
30};
31
32void __init pci_swiotlb_init(void)
33{
34	/* don't initialize swiotlb if iommu=off (no_iommu=1) */
35	if (!iommu_detected && !no_iommu && end_pfn > MAX_DMA32_PFN)
36	       swiotlb = 1;
37	if (swiotlb_force)
38		swiotlb = 1;
39	if (swiotlb) {
40		printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n");
41		swiotlb_init();
42		dma_ops = &swiotlb_dma_ops;
43	}
44}
45