| /* |
| * 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_ */ |
