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         struct iommu_domain *domain;
  59         int ret;
  60
  61         domain = iommu_domain_alloc(priv->dma_dev->bus);
  62         if (!domain)
  63                 return -ENOMEM;
  64
  65         ret = iommu_get_dma_cookie(domain);
  66         if (ret)
  67                 goto free_domain;
  68
  69         ret = iommu_dma_init_domain(domain, start, size, NULL);
  70         if (ret)
  71                 goto put_cookie;
  72
  73         priv->mapping = domain;
  74         return 0;
  75
  76 put_cookie:
  77         iommu_put_dma_cookie(domain);
  78 free_domain:
  79         iommu_domain_free(domain);
  80         return ret;
  81 }
  82
  83 static inline void __exynos_iommu_release_mapping(struct exynos_drm_private *priv)
  84 {
  85         struct iommu_domain *domain = priv->mapping;
  86
  87         iommu_put_dma_cookie(domain);
  88         iommu_domain_free(domain);
  89         priv->mapping = NULL;
  90 }
  91
  92 static inline int __exynos_iommu_attach(struct exynos_drm_private *priv,
  93                                         struct device *dev)
  94 {
  95         struct iommu_domain *domain = priv->mapping;
  96
  97         return iommu_attach_device(domain, dev);
  98 }
  99
 100 static inline void __exynos_iommu_detach(struct exynos_drm_private *priv,
 101                                          struct device *dev)
 102 {
 103         struct iommu_domain *domain = priv->mapping;
 104
 105         iommu_detach_device(domain, dev);
 106 }
 107 #else
 108 #error Unsupported architecture and IOMMU/DMA-mapping glue code
 109 #endif
 110
 111 int drm_create_iommu_mapping(struct drm_device *drm_dev);
 112
 113 void drm_release_iommu_mapping(struct drm_device *drm_dev);
 114
 115 int drm_iommu_attach_device(struct drm_device *drm_dev,
 116                                 struct device *subdrv_dev);
 117
 118 void drm_iommu_detach_device(struct drm_device *dev_dev,
 119                                 struct device *subdrv_dev);
 120
 121 static inline bool is_drm_iommu_supported(struct drm_device *drm_dev)
 122 {
 123         struct exynos_drm_private *priv = drm_dev->dev_private;
 124
 125         return priv->mapping ? true : false;
 126 }
 127
 128 #else
 129
 130 static inline int drm_create_iommu_mapping(struct drm_device *drm_dev)
 131 {
 132         return 0;
 133 }
 134
 135 static inline void drm_release_iommu_mapping(struct drm_device *drm_dev)
 136 {
 137 }
 138
 139 static inline int drm_iommu_attach_device(struct drm_device *drm_dev,
 140                                                 struct device *subdrv_dev)
 141 {
 142         return 0;
 143 }
 144
 145 static inline void drm_iommu_detach_device(struct drm_device *drm_dev,
 146                                                 struct device *subdrv_dev)
 147 {
 148 }
 149
 150 static inline bool is_drm_iommu_supported(struct drm_device *drm_dev)
 151 {
 152         return false;
 153 }
 154
 155 #endif
 156 #endif