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0519f9a1 ID |
1 | /* exynos_drm_iommu.c |
2 | * | |
3 | * Copyright (c) 2012 Samsung Electronics Co., Ltd. | |
4 | * Author: Inki Dae <inki.dae@samsung.com> | |
5 | * | |
d81aecb5 ID |
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. | |
0519f9a1 ID |
10 | */ |
11 | ||
12 | #include <drmP.h> | |
13 | #include <drm/exynos_drm.h> | |
14 | ||
15 | #include <linux/dma-mapping.h> | |
16 | #include <linux/iommu.h> | |
17 | #include <linux/kref.h> | |
18 | ||
19 | #include <asm/dma-iommu.h> | |
20 | ||
21 | #include "exynos_drm_drv.h" | |
22 | #include "exynos_drm_iommu.h" | |
23 | ||
24 | /* | |
25 | * drm_create_iommu_mapping - create a mapping structure | |
26 | * | |
27 | * @drm_dev: DRM device | |
28 | */ | |
29 | int drm_create_iommu_mapping(struct drm_device *drm_dev) | |
30 | { | |
31 | struct dma_iommu_mapping *mapping = NULL; | |
32 | struct exynos_drm_private *priv = drm_dev->dev_private; | |
33 | struct device *dev = drm_dev->dev; | |
34 | ||
35 | if (!priv->da_start) | |
36 | priv->da_start = EXYNOS_DEV_ADDR_START; | |
37 | if (!priv->da_space_size) | |
38 | priv->da_space_size = EXYNOS_DEV_ADDR_SIZE; | |
0519f9a1 ID |
39 | |
40 | mapping = arm_iommu_create_mapping(&platform_bus_type, priv->da_start, | |
68efd7d2 MS |
41 | priv->da_space_size); |
42 | ||
a0e41b56 WY |
43 | if (IS_ERR(mapping)) |
44 | return PTR_ERR(mapping); | |
0519f9a1 ID |
45 | |
46 | dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms), | |
47 | GFP_KERNEL); | |
4db7fcdf SK |
48 | if (!dev->dma_parms) |
49 | goto error; | |
50 | ||
0519f9a1 ID |
51 | dma_set_max_seg_size(dev, 0xffffffffu); |
52 | dev->archdata.mapping = mapping; | |
53 | ||
54 | return 0; | |
4db7fcdf SK |
55 | error: |
56 | arm_iommu_release_mapping(mapping); | |
57 | return -ENOMEM; | |
0519f9a1 ID |
58 | } |
59 | ||
60 | /* | |
61 | * drm_release_iommu_mapping - release iommu mapping structure | |
62 | * | |
63 | * @drm_dev: DRM device | |
64 | * | |
65 | * if mapping->kref becomes 0 then all things related to iommu mapping | |
66 | * will be released | |
67 | */ | |
68 | void drm_release_iommu_mapping(struct drm_device *drm_dev) | |
69 | { | |
70 | struct device *dev = drm_dev->dev; | |
71 | ||
72 | arm_iommu_release_mapping(dev->archdata.mapping); | |
73 | } | |
74 | ||
75 | /* | |
76 | * drm_iommu_attach_device- attach device to iommu mapping | |
77 | * | |
78 | * @drm_dev: DRM device | |
79 | * @subdrv_dev: device to be attach | |
80 | * | |
81 | * This function should be called by sub drivers to attach it to iommu | |
82 | * mapping. | |
83 | */ | |
84 | int drm_iommu_attach_device(struct drm_device *drm_dev, | |
85 | struct device *subdrv_dev) | |
86 | { | |
87 | struct device *dev = drm_dev->dev; | |
88 | int ret; | |
89 | ||
90 | if (!dev->archdata.mapping) { | |
91 | DRM_ERROR("iommu_mapping is null.\n"); | |
92 | return -EFAULT; | |
93 | } | |
94 | ||
95 | subdrv_dev->dma_parms = devm_kzalloc(subdrv_dev, | |
96 | sizeof(*subdrv_dev->dma_parms), | |
97 | GFP_KERNEL); | |
4db7fcdf SK |
98 | if (!subdrv_dev->dma_parms) |
99 | return -ENOMEM; | |
100 | ||
0519f9a1 ID |
101 | dma_set_max_seg_size(subdrv_dev, 0xffffffffu); |
102 | ||
103 | ret = arm_iommu_attach_device(subdrv_dev, dev->archdata.mapping); | |
104 | if (ret < 0) { | |
105 | DRM_DEBUG_KMS("failed iommu attach.\n"); | |
106 | return ret; | |
107 | } | |
108 | ||
109 | /* | |
110 | * Set dma_ops to drm_device just one time. | |
111 | * | |
112 | * The dma mapping api needs device object and the api is used | |
113 | * to allocate physial memory and map it with iommu table. | |
114 | * If iommu attach succeeded, the sub driver would have dma_ops | |
115 | * for iommu and also all sub drivers have same dma_ops. | |
116 | */ | |
117 | if (!dev->archdata.dma_ops) | |
118 | dev->archdata.dma_ops = subdrv_dev->archdata.dma_ops; | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | /* | |
124 | * drm_iommu_detach_device -detach device address space mapping from device | |
125 | * | |
126 | * @drm_dev: DRM device | |
127 | * @subdrv_dev: device to be detached | |
128 | * | |
129 | * This function should be called by sub drivers to detach it from iommu | |
130 | * mapping | |
131 | */ | |
132 | void drm_iommu_detach_device(struct drm_device *drm_dev, | |
133 | struct device *subdrv_dev) | |
134 | { | |
135 | struct device *dev = drm_dev->dev; | |
136 | struct dma_iommu_mapping *mapping = dev->archdata.mapping; | |
137 | ||
138 | if (!mapping || !mapping->domain) | |
139 | return; | |
140 | ||
141 | iommu_detach_device(mapping->domain, subdrv_dev); | |
142 | drm_release_iommu_mapping(drm_dev); | |
143 | } |