drivers/gpu/drm/exynos/exynos_drm_iommu.h

   1 /* exynos_drm_iommu.h
   2  *
   3  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   4  * Authoer: Inki Dae <inki.dae@samsung.com>
   5  *
   6  * This program is free software; you can redistribute  it and/or modify it
   7  * under  the terms of  the GNU General  Public License as published by the
   8  * Free Software Foundation;  either version 2 of the  License, or (at your
   9  * option) any later version.
  10  */
  11
  12 #ifndef _EXYNOS_DRM_IOMMU_H_
  13 #define _EXYNOS_DRM_IOMMU_H_
  14
  15 #define EXYNOS_DEV_ADDR_START   0x20000000
  16 #define EXYNOS_DEV_ADDR_SIZE    0x40000000
  17
  18 #ifdef CONFIG_DRM_EXYNOS_IOMMU
  19
  20 #if defined(CONFIG_ARM_DMA_USE_IOMMU)
  21 #include <asm/dma-iommu.h>
  22
  23 static inline int __exynos_iommu_create_mapping(struct exynos_drm_private *priv,
  24                                         unsigned long start, unsigned long size)
  25 {
  26         priv->mapping = arm_iommu_create_mapping(&platform_bus_type, start,
  27                                                  size);
  28         return IS_ERR(priv->mapping);
  29 }
  30
  31 static inline void
  32 __exynos_iommu_release_mapping(struct exynos_drm_private *priv)
  33 {
  34         arm_iommu_release_mapping(priv->mapping);
  35 }
  36
  37 static inline int __exynos_iommu_attach(struct exynos_drm_private *priv,
  38                                         struct device *dev)
  39 {
  40         if (dev->archdata.mapping)
  41                 arm_iommu_detach_device(dev);
  42
  43         return arm_iommu_attach_device(dev, priv->mapping);
  44 }
  45
  46 static inline void __exynos_iommu_detach(struct exynos_drm_private *priv,
  47                                          struct device *dev)
  48 {
  49         arm_iommu_detach_device(dev);
  50 }
  51
  52 #elif defined(CONFIG_IOMMU_DMA)
  53 #include <linux/dma-iommu.h>
  54
  55 static inline int __exynos_iommu_create_mapping(struct exynos_drm_private *priv,
  56                                         unsigned long start, unsigned long size)
  57 {
  58         priv->mapping = iommu_get_domain_for_dev(priv->dma_dev);
  59         return 0;
  60 }
  61
  62 static inline void __exynos_iommu_release_mapping(struct exynos_drm_private *priv)
  63 {
  64         priv->mapping = NULL;
  65 }
  66
  67 static inline int __exynos_iommu_attach(struct exynos_drm_private *priv,
  68                                         struct device *dev)
  69 {
  70         struct iommu_domain *domain = priv->mapping;
  71
  72         if (dev != priv->dma_dev)
  73                 return iommu_attach_device(domain, dev);
  74         return 0;
  75 }
  76
  77 static inline void __exynos_iommu_detach(struct exynos_drm_private *priv,
  78                                          struct device *dev)
  79 {
  80         struct iommu_domain *domain = priv->mapping;
  81
  82         if (dev != priv->dma_dev)
  83                 iommu_detach_device(domain, dev);
  84 }
  85 #else
  86 #error Unsupported architecture and IOMMU/DMA-mapping glue code
  87 #endif
  88
  89 int drm_create_iommu_mapping(struct drm_device *drm_dev);
  90
  91 void drm_release_iommu_mapping(struct drm_device *drm_dev);
  92
  93 int drm_iommu_attach_device(struct drm_device *drm_dev,
  94                                 struct device *subdrv_dev);
  95
  96 void drm_iommu_detach_device(struct drm_device *dev_dev,
  97                                 struct device *subdrv_dev);
  98
  99 static inline bool is_drm_iommu_supported(struct drm_device *drm_dev)
 100 {
 101         struct exynos_drm_private *priv = drm_dev->dev_private;
 102
 103         return priv->mapping ? true : false;
 104 }
 105
 106 #else
 107
 108 static inline int drm_create_iommu_mapping(struct drm_device *drm_dev)
 109 {
 110         return 0;
 111 }
 112
 113 static inline void drm_release_iommu_mapping(struct drm_device *drm_dev)
 114 {
 115 }
 116
 117 static inline int drm_iommu_attach_device(struct drm_device *drm_dev,
 118                                                 struct device *subdrv_dev)
 119 {
 120         return 0;
 121 }
 122
 123 static inline void drm_iommu_detach_device(struct drm_device *drm_dev,
 124                                                 struct device *subdrv_dev)
 125 {
 126 }
 127
 128 static inline bool is_drm_iommu_supported(struct drm_device *drm_dev)
 129 {
 130         return false;
 131 }
 132
 133 #endif
 134 #endif