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
33static 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
53static 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
65struct 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
93void 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
109MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
110MODULE_DESCRIPTION("Samsung SoC DRM Buffer Management Module");
111MODULE_LICENSE("GPL");
112