1 /* exynos_drm_fb.c
2  *
3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4  * Authors:
5  *	Inki Dae <inki.dae@samsung.com>
6  *	Joonyoung Shim <jy0922.shim@samsung.com>
7  *	Seung-Woo Kim <sw0312.kim@samsung.com>
8  *
9  * This program is free software; you can redistribute  it and/or modify it
10  * under  the terms of  the GNU General  Public License as published by the
11  * Free Software Foundation;  either version 2 of the  License, or (at your
12  * option) any later version.
13  */
14 
15 #include <drm/drmP.h>
16 #include <drm/drm_crtc.h>
17 #include <drm/drm_crtc_helper.h>
18 #include <drm/drm_fb_helper.h>
19 #include <drm/drm_atomic.h>
20 #include <drm/drm_atomic_helper.h>
21 #include <uapi/drm/exynos_drm.h>
22 
23 #include "exynos_drm_drv.h"
24 #include "exynos_drm_fb.h"
25 #include "exynos_drm_fbdev.h"
26 #include "exynos_drm_iommu.h"
27 #include "exynos_drm_crtc.h"
28 
29 #define to_exynos_fb(x)	container_of(x, struct exynos_drm_fb, fb)
30 
31 /*
32  * exynos specific framebuffer structure.
33  *
34  * @fb: drm framebuffer obejct.
35  * @exynos_gem: array of exynos specific gem object containing a gem object.
36  */
37 struct exynos_drm_fb {
38 	struct drm_framebuffer	fb;
39 	struct exynos_drm_gem	*exynos_gem[MAX_FB_BUFFER];
40 	dma_addr_t			dma_addr[MAX_FB_BUFFER];
41 };
42 
43 static int check_fb_gem_memory_type(struct drm_device *drm_dev,
44 				    struct exynos_drm_gem *exynos_gem)
45 {
46 	unsigned int flags;
47 
48 	/*
49 	 * if exynos drm driver supports iommu then framebuffer can use
50 	 * all the buffer types.
51 	 */
52 	if (is_drm_iommu_supported(drm_dev))
53 		return 0;
54 
55 	flags = exynos_gem->flags;
56 
57 	/*
58 	 * without iommu support, not support physically non-continuous memory
59 	 * for framebuffer.
60 	 */
61 	if (IS_NONCONTIG_BUFFER(flags)) {
62 		DRM_ERROR("cannot use this gem memory type for fb.\n");
63 		return -EINVAL;
64 	}
65 
66 	return 0;
67 }
68 
69 static void exynos_drm_fb_destroy(struct drm_framebuffer *fb)
70 {
71 	struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
72 	unsigned int i;
73 
74 	drm_framebuffer_cleanup(fb);
75 
76 	for (i = 0; i < ARRAY_SIZE(exynos_fb->exynos_gem); i++) {
77 		struct drm_gem_object *obj;
78 
79 		if (exynos_fb->exynos_gem[i] == NULL)
80 			continue;
81 
82 		obj = &exynos_fb->exynos_gem[i]->base;
83 		drm_gem_object_unreference_unlocked(obj);
84 	}
85 
86 	kfree(exynos_fb);
87 	exynos_fb = NULL;
88 }
89 
90 static int exynos_drm_fb_create_handle(struct drm_framebuffer *fb,
91 					struct drm_file *file_priv,
92 					unsigned int *handle)
93 {
94 	struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
95 
96 	return drm_gem_handle_create(file_priv,
97 				     &exynos_fb->exynos_gem[0]->base, handle);
98 }
99 
100 static const struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
101 	.destroy	= exynos_drm_fb_destroy,
102 	.create_handle	= exynos_drm_fb_create_handle,
103 };
104 
105 struct drm_framebuffer *
106 exynos_drm_framebuffer_init(struct drm_device *dev,
107 			    const struct drm_mode_fb_cmd2 *mode_cmd,
108 			    struct exynos_drm_gem **exynos_gem,
109 			    int count)
110 {
111 	struct exynos_drm_fb *exynos_fb;
112 	int i;
113 	int ret;
114 
115 	exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
116 	if (!exynos_fb)
117 		return ERR_PTR(-ENOMEM);
118 
119 	for (i = 0; i < count; i++) {
120 		ret = check_fb_gem_memory_type(dev, exynos_gem[i]);
121 		if (ret < 0)
122 			goto err;
123 
124 		exynos_fb->exynos_gem[i] = exynos_gem[i];
125 		exynos_fb->dma_addr[i] = exynos_gem[i]->dma_addr
126 						+ mode_cmd->offsets[i];
127 	}
128 
129 	drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
130 
131 	ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
132 	if (ret < 0) {
133 		DRM_ERROR("failed to initialize framebuffer\n");
134 		goto err;
135 	}
136 
137 	return &exynos_fb->fb;
138 
139 err:
140 	kfree(exynos_fb);
141 	return ERR_PTR(ret);
142 }
143 
144 static struct drm_framebuffer *
145 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
146 		      const struct drm_mode_fb_cmd2 *mode_cmd)
147 {
148 	struct exynos_drm_gem *exynos_gem[MAX_FB_BUFFER];
149 	struct drm_gem_object *obj;
150 	struct drm_framebuffer *fb;
151 	int i;
152 	int ret;
153 
154 	for (i = 0; i < drm_format_num_planes(mode_cmd->pixel_format); i++) {
155 		obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[i]);
156 		if (!obj) {
157 			DRM_ERROR("failed to lookup gem object\n");
158 			ret = -ENOENT;
159 			goto err;
160 		}
161 
162 		exynos_gem[i] = to_exynos_gem(obj);
163 	}
164 
165 	fb = exynos_drm_framebuffer_init(dev, mode_cmd, exynos_gem, i);
166 	if (IS_ERR(fb)) {
167 		ret = PTR_ERR(fb);
168 		goto err;
169 	}
170 
171 	return fb;
172 
173 err:
174 	while (i--)
175 		drm_gem_object_unreference_unlocked(&exynos_gem[i]->base);
176 
177 	return ERR_PTR(ret);
178 }
179 
180 dma_addr_t exynos_drm_fb_dma_addr(struct drm_framebuffer *fb, int index)
181 {
182 	struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
183 
184 	if (index >= MAX_FB_BUFFER)
185 		return DMA_ERROR_CODE;
186 
187 	return exynos_fb->dma_addr[index];
188 }
189 
190 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
191 	.fb_create = exynos_user_fb_create,
192 	.output_poll_changed = exynos_drm_output_poll_changed,
193 	.atomic_check = drm_atomic_helper_check,
194 	.atomic_commit = exynos_atomic_commit,
195 };
196 
197 void exynos_drm_mode_config_init(struct drm_device *dev)
198 {
199 	dev->mode_config.min_width = 0;
200 	dev->mode_config.min_height = 0;
201 
202 	/*
203 	 * set max width and height as default value(4096x4096).
204 	 * this value would be used to check framebuffer size limitation
205 	 * at drm_mode_addfb().
206 	 */
207 	dev->mode_config.max_width = 4096;
208 	dev->mode_config.max_height = 4096;
209 
210 	dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
211 }
212