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 int drm_create_iommu_mapping(struct drm_device *drm_dev);
  21
  22 void drm_release_iommu_mapping(struct drm_device *drm_dev);
  23
  24 int drm_iommu_attach_device(struct drm_device *drm_dev,
  25                                 struct device *subdrv_dev);
  26
  27 void drm_iommu_detach_device(struct drm_device *dev_dev,
  28                                 struct device *subdrv_dev);
  29
  30 static inline bool is_drm_iommu_supported(struct drm_device *drm_dev)
  31 {
  32 #ifdef CONFIG_ARM_DMA_USE_IOMMU
  33         struct device *dev = drm_dev->dev;
  34
  35         return dev->archdata.mapping ? true : false;
  36 #else
  37         return false;
  38 #endif
  39 }
  40
  41 int drm_iommu_attach_device_if_possible(
  42                 struct exynos_drm_crtc *exynos_crtc, struct drm_device *drm_dev,
  43                 struct device *subdrv_dev);
  44
  45 #else
  46
  47 static inline int drm_create_iommu_mapping(struct drm_device *drm_dev)
  48 {
  49         return 0;
  50 }
  51
  52 static inline void drm_release_iommu_mapping(struct drm_device *drm_dev)
  53 {
  54 }
  55
  56 static inline int drm_iommu_attach_device(struct drm_device *drm_dev,
  57                                                 struct device *subdrv_dev)
  58 {
  59         return 0;
  60 }
  61
  62 static inline void drm_iommu_detach_device(struct drm_device *drm_dev,
  63                                                 struct device *subdrv_dev)
  64 {
  65 }
  66
  67 static inline bool is_drm_iommu_supported(struct drm_device *drm_dev)
  68 {
  69         return false;
  70 }
  71
  72 static inline int drm_iommu_attach_device_if_possible(
  73                 struct exynos_drm_crtc *exynos_crtc, struct drm_device *drm_dev,
  74                 struct device *subdrv_dev)
  75 {
  76         return 0;
  77 }
  78
  79 #endif
  80 #endif