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
__exynos_iommu_create_mapping(struct exynos_drm_private * priv,unsigned long start,unsigned long size)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
__exynos_iommu_release_mapping(struct exynos_drm_private * priv)32 __exynos_iommu_release_mapping(struct exynos_drm_private *priv)
33 {
34 arm_iommu_release_mapping(priv->mapping);
35 }
36
__exynos_iommu_attach(struct exynos_drm_private * priv,struct device * dev)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
__exynos_iommu_detach(struct exynos_drm_private * priv,struct device * dev)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
__exynos_iommu_create_mapping(struct exynos_drm_private * priv,unsigned long start,unsigned long size)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
__exynos_iommu_release_mapping(struct exynos_drm_private * priv)62 static inline void __exynos_iommu_release_mapping(struct exynos_drm_private *priv)
63 {
64 priv->mapping = NULL;
65 }
66
__exynos_iommu_attach(struct exynos_drm_private * priv,struct device * dev)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
__exynos_iommu_detach(struct exynos_drm_private * priv,struct device * dev)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
is_drm_iommu_supported(struct drm_device * drm_dev)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
drm_create_iommu_mapping(struct drm_device * drm_dev)108 static inline int drm_create_iommu_mapping(struct drm_device *drm_dev)
109 {
110 return 0;
111 }
112
drm_release_iommu_mapping(struct drm_device * drm_dev)113 static inline void drm_release_iommu_mapping(struct drm_device *drm_dev)
114 {
115 }
116
drm_iommu_attach_device(struct drm_device * drm_dev,struct device * subdrv_dev)117 static inline int drm_iommu_attach_device(struct drm_device *drm_dev,
118 struct device *subdrv_dev)
119 {
120 return 0;
121 }
122
drm_iommu_detach_device(struct drm_device * drm_dev,struct device * subdrv_dev)123 static inline void drm_iommu_detach_device(struct drm_device *drm_dev,
124 struct device *subdrv_dev)
125 {
126 }
127
is_drm_iommu_supported(struct drm_device * drm_dev)128 static inline bool is_drm_iommu_supported(struct drm_device *drm_dev)
129 {
130 return false;
131 }
132
133 #endif
134 #endif
135
