arch/ia64/kernel/pci-swiotlb.c

/* Glue code to lib/swiotlb.c */

#include <linux/pci.h>
#include <linux/cache.h>
#include <linux/module.h>
#include <linux/dma-mapping.h>

#include <asm/swiotlb.h>
#include <asm/dma.h>
#include <asm/iommu.h>
#include <asm/machvec.h>

int swiotlb __read_mostly;
EXPORT_SYMBOL(swiotlb);

/* Set this to 1 if there is a HW IOMMU in the system */
int iommu_detected __read_mostly;

static dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
				   unsigned long offset, size_t size,
				   enum dma_data_direction dir,
				   struct dma_attrs *attrs)
{
	return swiotlb_map_single_attrs(dev, page_address(page) + offset, size,
					dir, attrs);
}

static void swiotlb_unmap_page(struct device *dev, dma_addr_t dma_handle,
			       size_t size, enum dma_data_direction dir,
			       struct dma_attrs *attrs)
{
	swiotlb_unmap_single_attrs(dev, dma_handle, size, dir, attrs);
}

struct dma_map_ops swiotlb_dma_ops = {
	.alloc_coherent = swiotlb_alloc_coherent,
	.free_coherent = swiotlb_free_coherent,
	.map_page = swiotlb_map_page,
	.unmap_page = swiotlb_unmap_page,
	.map_sg = swiotlb_map_sg_attrs,
	.unmap_sg = swiotlb_unmap_sg_attrs,
	.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
	.sync_single_for_device = swiotlb_sync_single_for_device,
	.sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu,
	.sync_single_range_for_device = swiotlb_sync_single_range_for_device,
	.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
	.sync_sg_for_device = swiotlb_sync_sg_for_device,
	.dma_supported = swiotlb_dma_supported,
	.mapping_error = swiotlb_dma_mapping_error,
};

void swiotlb_dma_init(void)
{
	dma_ops = &swiotlb_dma_ops;
	swiotlb_init();
}

void __init pci_swiotlb_init(void)
{
	if (!iommu_detected) {
#ifdef CONFIG_IA64_GENERIC
		swiotlb = 1;
		printk(KERN_INFO "PCI-DMA: Re-initialize machine vector.\n");
		machvec_init("dig");
		swiotlb_init();
		dma_ops = &swiotlb_dma_ops;
#else
		panic("Unable to find Intel IOMMU");
#endif
	}
}