drivers/media/platform/s5p-mfc/s5p_mfc_iommu.h

   1 /*
   2  * Copyright (C) 2015 Samsung Electronics Co.Ltd
   3  * Authors: Marek Szyprowski <m.szyprowski@samsung.com>
   4  *
   5  * This program is free software; you can redistribute  it and/or modify it
   6  * under  the terms of  the GNU General  Public License as published by the
   7  * Free Software Foundation;  either version 2 of the  License, or (at your
   8  * option) any later version.
   9  */
  10
  11 #ifndef S5P_MFC_IOMMU_H_
  12 #define S5P_MFC_IOMMU_H_
  13
  14 #define S5P_MFC_IOMMU_DMA_BASE  0x20000000lu
  15 #define S5P_MFC_IOMMU_DMA_SIZE  SZ_256M
  16
  17 #if defined(CONFIG_EXYNOS_IOMMU) && defined(CONFIG_ARM_DMA_USE_IOMMU)
  18
  19 #include <asm/dma-iommu.h>
  20
  21 static inline bool exynos_is_iommu_available(struct device *dev)
  22 {
  23         return dev->archdata.iommu != NULL;
  24 }
  25
  26 static inline void exynos_unconfigure_iommu(struct device *dev)
  27 {
  28         struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
  29
  30         arm_iommu_detach_device(dev);
  31         arm_iommu_release_mapping(mapping);
  32 }
  33
  34 static inline int exynos_configure_iommu(struct device *dev,
  35                                          unsigned int base, unsigned int size)
  36 {
  37         struct dma_iommu_mapping *mapping = NULL;
  38         int ret;
  39
  40         /* Disable the default mapping created by device core */
  41         if (to_dma_iommu_mapping(dev))
  42                 exynos_unconfigure_iommu(dev);
  43
  44         mapping = arm_iommu_create_mapping(dev->bus, base, size);
  45         if (IS_ERR(mapping)) {
  46                 pr_warn("Failed to create IOMMU mapping for device %s\n",
  47                         dev_name(dev));
  48                 return PTR_ERR(mapping);
  49         }
  50
  51         ret = arm_iommu_attach_device(dev, mapping);
  52         if (ret) {
  53                 pr_warn("Failed to attached device %s to IOMMU_mapping\n",
  54                                 dev_name(dev));
  55                 arm_iommu_release_mapping(mapping);
  56                 return ret;
  57         }
  58
  59         return 0;
  60 }
  61
  62 #else
  63
  64 static inline bool exynos_is_iommu_available(struct device *dev)
  65 {
  66         return false;
  67 }
  68
  69 static inline int exynos_configure_iommu(struct device *dev,
  70                                          unsigned int base, unsigned int size)
  71 {
  72         return -ENOSYS;
  73 }
  74
  75 static inline void exynos_unconfigure_iommu(struct device *dev) { }
  76
  77 #endif
  78
  79 #endif /* S5P_MFC_IOMMU_H_ */