u-boot/arch/arm/include/asm/dma-mapping.h

/*
 * (C) Copyright 2007
 * Stelian Pop <stelian@popies.net>
 * Lead Tech Design <www.leadtechdesign.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */
#ifndef __ASM_ARM_DMA_MAPPING_H
#define __ASM_ARM_DMA_MAPPING_H

enum dma_data_direction {
	DMA_BIDIRECTIONAL	= 0,
	DMA_TO_DEVICE		= 1,
	DMA_FROM_DEVICE		= 2,
};

static void *dma_alloc_coherent(size_t len, unsigned long *handle)
{
	*handle = (unsigned long)memalign(ARCH_DMA_MINALIGN, len);
	return (void *)*handle;
}

static inline unsigned long dma_map_single(volatile void *vaddr, size_t len,
					   enum dma_data_direction dir)
{
	return (unsigned long)vaddr;
}

static inline void dma_unmap_single(volatile void *vaddr, size_t len,
				    unsigned long paddr)
{
}

#endif /* __ASM_ARM_DMA_MAPPING_H */