add dma_mapping_ops for SGI Altix

#include <linux/module.h>

#include <linux/dma-attrs.h>

#include <linux/dma-mapping.h>

#include <asm/dma.h>

#include <asm/sn/intr.h>

#include <asm/sn/pcibus_provider_defs.h>

 out:

	return ret;

}

struct dma_mapping_ops sn_dma_ops = {

	.alloc_coherent		= sn_dma_alloc_coherent,

	.free_coherent		= sn_dma_free_coherent,

	.map_single_attrs	= sn_dma_map_single_attrs,

	.unmap_single_attrs	= sn_dma_unmap_single_attrs,

	.map_sg_attrs		= sn_dma_map_sg_attrs,

	.unmap_sg_attrs		= sn_dma_unmap_sg_attrs,

	.sync_single_for_cpu 	= sn_dma_sync_single_for_cpu,

	.sync_sg_for_cpu	= sn_dma_sync_sg_for_cpu,

	.sync_single_for_device = sn_dma_sync_single_for_device,

	.sync_sg_for_device	= sn_dma_sync_sg_for_device,

	.mapping_error		= sn_dma_mapping_error,

	.dma_supported_op	= sn_dma_supported,

};