1 /* exynos_drm_buf.c
2 *
3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * Author: Inki Dae <inki.dae@samsung.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
15 * Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26 #include "drmP.h"
27 #include "drm.h"
28
29 #include "exynos_drm_drv.h"
30 #include "exynos_drm_gem.h"
31 #include "exynos_drm_buf.h"
32
lowlevel_buffer_allocate(struct drm_device * dev,struct exynos_drm_gem_buf * buffer)33 static int lowlevel_buffer_allocate(struct drm_device *dev,
34 struct exynos_drm_gem_buf *buffer)
35 {
36 DRM_DEBUG_KMS("%s\n", __FILE__);
37
38 buffer->kvaddr = dma_alloc_writecombine(dev->dev, buffer->size,
39 &buffer->dma_addr, GFP_KERNEL);
40 if (!buffer->kvaddr) {
41 DRM_ERROR("failed to allocate buffer.\n");
42 return -ENOMEM;
43 }
44
45 DRM_DEBUG_KMS("vaddr(0x%lx), dma_addr(0x%lx), size(0x%lx)\n",
46 (unsigned long)buffer->kvaddr,
47 (unsigned long)buffer->dma_addr,
48 buffer->size);
49
50 return 0;
51 }
52
lowlevel_buffer_deallocate(struct drm_device * dev,struct exynos_drm_gem_buf * buffer)53 static void lowlevel_buffer_deallocate(struct drm_device *dev,
54 struct exynos_drm_gem_buf *buffer)
55 {
56 DRM_DEBUG_KMS("%s.\n", __FILE__);
57
58 if (buffer->dma_addr && buffer->size)
59 dma_free_writecombine(dev->dev, buffer->size, buffer->kvaddr,
60 (dma_addr_t)buffer->dma_addr);
61 else
62 DRM_DEBUG_KMS("buffer data are invalid.\n");
63 }
64
exynos_drm_buf_create(struct drm_device * dev,unsigned int size)65 struct exynos_drm_gem_buf *exynos_drm_buf_create(struct drm_device *dev,
66 unsigned int size)
67 {
68 struct exynos_drm_gem_buf *buffer;
69
70 DRM_DEBUG_KMS("%s.\n", __FILE__);
71 DRM_DEBUG_KMS("desired size = 0x%x\n", size);
72
73 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
74 if (!buffer) {
75 DRM_ERROR("failed to allocate exynos_drm_gem_buf.\n");
76 return NULL;
77 }
78
79 buffer->size = size;
80
81 /*
82 * allocate memory region with size and set the memory information
83 * to vaddr and dma_addr of a buffer object.
84 */
85 if (lowlevel_buffer_allocate(dev, buffer) < 0) {
86 kfree(buffer);
87 return NULL;
88 }
89
90 return buffer;
91 }
92
exynos_drm_buf_destroy(struct drm_device * dev,struct exynos_drm_gem_buf * buffer)93 void exynos_drm_buf_destroy(struct drm_device *dev,
94 struct exynos_drm_gem_buf *buffer)
95 {
96 DRM_DEBUG_KMS("%s.\n", __FILE__);
97
98 if (!buffer) {
99 DRM_DEBUG_KMS("buffer is null.\n");
100 return;
101 }
102
103 lowlevel_buffer_deallocate(dev, buffer);
104
105 kfree(buffer);
106 buffer = NULL;
107 }
108
109 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
110 MODULE_DESCRIPTION("Samsung SoC DRM Buffer Management Module");
111 MODULE_LICENSE("GPL");
112