linux_kernel/arch/xtensa/include/asm/dma-mapping.h

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2003 - 2005 Tensilica Inc.
 * Copyright (C) 2015 Cadence Design Systems Inc.
 */

#ifndef _XTENSA_DMA_MAPPING_H
#define _XTENSA_DMA_MAPPING_H

#include <asm/cache.h>
#include <asm/io.h>

#include <linux/mm.h>
#include <linux/scatterlist.h>

#define DMA_ERROR_CODE		(~(dma_addr_t)0x0)

extern const struct dma_map_ops xtensa_dma_map_ops;

static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
{
	return &xtensa_dma_map_ops;
}

void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
		    enum dma_data_direction direction);

static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
{
	return (dma_addr_t)paddr;
}

static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
{
	return (phys_addr_t)daddr;
}

#endif	/* _XTENSA_DMA_MAPPING_H */