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/* linux/arch/arm/plat-s5p/include/plat/iovmm.h
*
* Copyright (c) 2011 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __ASM_PLAT_IOVMM_H
#define __ASM_PLAT_IOVMM_H
#ifdef CONFIG_EXYNOS_IOVMM
struct scatterlist;
int iovmm_setup(struct device *dev);
void iovmm_cleanup(struct device *dev);
int iovmm_activate(struct device *dev);
void iovmm_deactivate(struct device *dev);
/* iovmm_map() - Maps a list of physical memory chunks
* @dev: the owner of the IO address space where the mapping is created
* @sg: list of physical memory chunks to map
* @offset: length in bytes where the mapping starts
* @size: how much memory to map in bytes. @offset + @size must not exceed
* total size of @sg
*
* This function returns mapped IO address in the address space of @dev.
* Returns 0 if mapping fails.
*
* The caller of this function must ensure that iovmm_cleanup() is not called
* while this function is called.
*
*/
dma_addr_t iovmm_map(struct device *dev, struct scatterlist *sg, off_t offset,
size_t size);
/* iovmm_map() - unmaps the given IO address
* @dev: the owner of the IO address space where @iova belongs
* @iova: IO address that needs to be unmapped and freed.
*
* The caller of this function must ensure that iovmm_cleanup() is not called
* while this function is called.
*/
void iovmm_unmap(struct device *dev, dma_addr_t iova);
/* iovmm_map_oto - create one to one mapping for the given physical address
* @dev: the owner of the IO address space to map
* @phys: physical address to map
* @size: size of the mapping to create
*
* This function return 0 if mapping is successful. Otherwise, minus error
* value.
*/
int iovmm_map_oto(struct device *dev, phys_addr_t phys, size_t size);
/* iovmm_unmap_oto - remove one to one mapping
* @dev: the owner ofthe IO address space
* @phys: physical address to remove mapping
*/
void iovmm_unmap_oto(struct device *dev, phys_addr_t phys);
#else
#define iovmm_setup(dev) (-ENOSYS)
#define iovmm_cleanup(dev) do { } while (0)
#define iovmm_activate(dev) (-ENOSYS)
#define iovmm_deactivate(dev) do { } while (0)
#define iovmm_map(dev, sg) (0)
#define iovmm_unmap(dev, iova) do { } while (0)
#define iovmm_map_oto(dev, phys, size) (0)
#define iovmm_unmap_oto(dev, phys) do { } while (0)
#endif /* CONFIG_EXYNOS_IOVMM */
#endif /*__ASM_PLAT_IOVMM_H*/
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