1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* exynos_drm_fbdev.c
3  *
4  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
5  * Authors:
6  *	Inki Dae <inki.dae@samsung.com>
7  *	Joonyoung Shim <jy0922.shim@samsung.com>
8  *	Seung-Woo Kim <sw0312.kim@samsung.com>
9  */
10 
11 #include <linux/console.h>
12 #include <linux/dma-mapping.h>
13 #include <linux/vmalloc.h>
14 
15 #include <drm/drm_crtc.h>
16 #include <drm/drm_fb_helper.h>
17 #include <drm/drm_fourcc.h>
18 #include <drm/drm_framebuffer.h>
19 #include <drm/drm_prime.h>
20 #include <drm/drm_probe_helper.h>
21 #include <drm/exynos_drm.h>
22 
23 #include "exynos_drm_drv.h"
24 #include "exynos_drm_fb.h"
25 #include "exynos_drm_fbdev.h"
26 
27 #define MAX_CONNECTOR		4
28 #define PREFERRED_BPP		32
29 
30 #define to_exynos_fbdev(x)	container_of(x, struct exynos_drm_fbdev,\
31 				drm_fb_helper)
32 
33 struct exynos_drm_fbdev {
34 	struct drm_fb_helper	drm_fb_helper;
35 	struct exynos_drm_gem	*exynos_gem;
36 };
37 
38 static int exynos_drm_fb_mmap(struct fb_info *info,
39 			struct vm_area_struct *vma)
40 {
41 	struct drm_fb_helper *helper = info->par;
42 	struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
43 	struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
44 
45 	return drm_gem_prime_mmap(&exynos_gem->base, vma);
46 }
47 
48 static const struct fb_ops exynos_drm_fb_ops = {
49 	.owner		= THIS_MODULE,
50 	DRM_FB_HELPER_DEFAULT_OPS,
51 	.fb_mmap        = exynos_drm_fb_mmap,
52 	.fb_read	= drm_fb_helper_cfb_read,
53 	.fb_write	= drm_fb_helper_cfb_write,
54 	.fb_fillrect	= drm_fb_helper_cfb_fillrect,
55 	.fb_copyarea	= drm_fb_helper_cfb_copyarea,
56 	.fb_imageblit	= drm_fb_helper_cfb_imageblit,
57 };
58 
59 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
60 				   struct drm_fb_helper_surface_size *sizes,
61 				   struct exynos_drm_gem *exynos_gem)
62 {
63 	struct fb_info *fbi;
64 	struct drm_framebuffer *fb = helper->fb;
65 	unsigned int size = fb->width * fb->height * fb->format->cpp[0];
66 	unsigned long offset;
67 
68 	fbi = drm_fb_helper_alloc_info(helper);
69 	if (IS_ERR(fbi)) {
70 		DRM_DEV_ERROR(to_dma_dev(helper->dev),
71 			      "failed to allocate fb info.\n");
72 		return PTR_ERR(fbi);
73 	}
74 
75 	fbi->fbops = &exynos_drm_fb_ops;
76 
77 	drm_fb_helper_fill_info(fbi, helper, sizes);
78 
79 	offset = fbi->var.xoffset * fb->format->cpp[0];
80 	offset += fbi->var.yoffset * fb->pitches[0];
81 
82 	fbi->screen_buffer = exynos_gem->kvaddr + offset;
83 	fbi->screen_size = size;
84 	fbi->fix.smem_len = size;
85 
86 	return 0;
87 }
88 
89 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
90 				    struct drm_fb_helper_surface_size *sizes)
91 {
92 	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
93 	struct exynos_drm_gem *exynos_gem;
94 	struct drm_device *dev = helper->dev;
95 	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
96 	unsigned long size;
97 	int ret;
98 
99 	DRM_DEV_DEBUG_KMS(dev->dev,
100 			  "surface width(%d), height(%d) and bpp(%d\n",
101 			  sizes->surface_width, sizes->surface_height,
102 			  sizes->surface_bpp);
103 
104 	mode_cmd.width = sizes->surface_width;
105 	mode_cmd.height = sizes->surface_height;
106 	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
107 	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
108 							  sizes->surface_depth);
109 
110 	size = mode_cmd.pitches[0] * mode_cmd.height;
111 
112 	exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_WC, size, true);
113 	if (IS_ERR(exynos_gem))
114 		return PTR_ERR(exynos_gem);
115 
116 	exynos_fbdev->exynos_gem = exynos_gem;
117 
118 	helper->fb =
119 		exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
120 	if (IS_ERR(helper->fb)) {
121 		DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n");
122 		ret = PTR_ERR(helper->fb);
123 		goto err_destroy_gem;
124 	}
125 
126 	ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
127 	if (ret < 0)
128 		goto err_destroy_framebuffer;
129 
130 	return ret;
131 
132 err_destroy_framebuffer:
133 	drm_framebuffer_cleanup(helper->fb);
134 err_destroy_gem:
135 	exynos_drm_gem_destroy(exynos_gem);
136 
137 	/*
138 	 * if failed, all resources allocated above would be released by
139 	 * drm_mode_config_cleanup() when drm_load() had been called prior
140 	 * to any specific driver such as fimd or hdmi driver.
141 	 */
142 
143 	return ret;
144 }
145 
146 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
147 	.fb_probe =	exynos_drm_fbdev_create,
148 };
149 
150 int exynos_drm_fbdev_init(struct drm_device *dev)
151 {
152 	struct exynos_drm_fbdev *fbdev;
153 	struct exynos_drm_private *private = dev->dev_private;
154 	struct drm_fb_helper *helper;
155 	int ret;
156 
157 	if (!dev->mode_config.num_crtc)
158 		return 0;
159 
160 	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
161 	if (!fbdev)
162 		return -ENOMEM;
163 
164 	private->fb_helper = helper = &fbdev->drm_fb_helper;
165 
166 	drm_fb_helper_prepare(dev, helper, PREFERRED_BPP, &exynos_drm_fb_helper_funcs);
167 
168 	ret = drm_fb_helper_init(dev, helper);
169 	if (ret < 0) {
170 		DRM_DEV_ERROR(dev->dev,
171 			      "failed to initialize drm fb helper.\n");
172 		goto err_init;
173 	}
174 
175 	ret = drm_fb_helper_initial_config(helper);
176 	if (ret < 0) {
177 		DRM_DEV_ERROR(dev->dev,
178 			      "failed to set up hw configuration.\n");
179 		goto err_setup;
180 	}
181 
182 	return 0;
183 
184 err_setup:
185 	drm_fb_helper_fini(helper);
186 err_init:
187 	drm_fb_helper_unprepare(helper);
188 	private->fb_helper = NULL;
189 	kfree(fbdev);
190 
191 	return ret;
192 }
193 
194 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
195 				      struct drm_fb_helper *fb_helper)
196 {
197 	struct drm_framebuffer *fb;
198 
199 	/* release drm framebuffer and real buffer */
200 	if (fb_helper->fb && fb_helper->fb->funcs) {
201 		fb = fb_helper->fb;
202 		if (fb)
203 			drm_framebuffer_remove(fb);
204 	}
205 
206 	drm_fb_helper_unregister_info(fb_helper);
207 
208 	drm_fb_helper_fini(fb_helper);
209 }
210 
211 void exynos_drm_fbdev_fini(struct drm_device *dev)
212 {
213 	struct exynos_drm_private *private = dev->dev_private;
214 	struct exynos_drm_fbdev *fbdev;
215 
216 	if (!private || !private->fb_helper)
217 		return;
218 
219 	fbdev = to_exynos_fbdev(private->fb_helper);
220 
221 	exynos_drm_fbdev_destroy(dev, private->fb_helper);
222 	drm_fb_helper_unprepare(private->fb_helper);
223 	kfree(fbdev);
224 	private->fb_helper = NULL;
225 }
226 
227