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/*
* Copyright (C) 2015 Samsung Electronics Co.Ltd
* Authors: Marek Szyprowski <m.szyprowski@samsung.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#ifndef S5P_MFC_IOMMU_H_
#define S5P_MFC_IOMMU_H_
#define S5P_MFC_IOMMU_DMA_BASE 0x20000000lu
#define S5P_MFC_IOMMU_DMA_SIZE SZ_256M
#if defined(CONFIG_EXYNOS_IOMMU) && defined(CONFIG_ARM_DMA_USE_IOMMU)
#include <asm/dma-iommu.h>
static inline bool exynos_is_iommu_available(struct device *dev)
{
return dev->archdata.iommu != NULL;
}
static inline void exynos_unconfigure_iommu(struct device *dev)
{
struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
arm_iommu_detach_device(dev);
arm_iommu_release_mapping(mapping);
}
static inline int exynos_configure_iommu(struct device *dev,
unsigned int base, unsigned int size)
{
struct dma_iommu_mapping *mapping = NULL;
int ret;
/* Disable the default mapping created by device core */
if (to_dma_iommu_mapping(dev))
exynos_unconfigure_iommu(dev);
mapping = arm_iommu_create_mapping(dev->bus, base, size);
if (IS_ERR(mapping)) {
pr_warn("Failed to create IOMMU mapping for device %s\n",
dev_name(dev));
return PTR_ERR(mapping);
}
ret = arm_iommu_attach_device(dev, mapping);
if (ret) {
pr_warn("Failed to attached device %s to IOMMU_mapping\n",
dev_name(dev));
arm_iommu_release_mapping(mapping);
return ret;
}
return 0;
}
#else
static inline bool exynos_is_iommu_available(struct device *dev)
{
return false;
}
static inline int exynos_configure_iommu(struct device *dev,
unsigned int base, unsigned int size)
{
return -ENOSYS;
}
static inline void exynos_unconfigure_iommu(struct device *dev) { }
#endif
#endif /* S5P_MFC_IOMMU_H_ */
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