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/fb.h>
12
13 #include <drm/drm_crtc_helper.h>
14 #include <drm/drm_drv.h>
15 #include <drm/drm_fb_helper.h>
16 #include <drm/drm_framebuffer.h>
17 #include <drm/drm_gem_framebuffer_helper.h>
18 #include <drm/drm_prime.h>
19 #include <drm/exynos_drm.h>
20
21 #include "exynos_drm_drv.h"
22 #include "exynos_drm_fb.h"
23 #include "exynos_drm_fbdev.h"
24
25 #define MAX_CONNECTOR 4
26 #define PREFERRED_BPP 32
27
exynos_drm_fb_mmap(struct fb_info * info,struct vm_area_struct * vma)28 static int exynos_drm_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
29 {
30 struct drm_fb_helper *helper = info->par;
31 struct drm_gem_object *obj = drm_gem_fb_get_obj(helper->fb, 0);
32
33 return drm_gem_prime_mmap(obj, vma);
34 }
35
exynos_drm_fb_destroy(struct fb_info * info)36 static void exynos_drm_fb_destroy(struct fb_info *info)
37 {
38 struct drm_fb_helper *fb_helper = info->par;
39 struct drm_framebuffer *fb = fb_helper->fb;
40
41 drm_fb_helper_fini(fb_helper);
42
43 drm_framebuffer_remove(fb);
44
45 drm_client_release(&fb_helper->client);
46 drm_fb_helper_unprepare(fb_helper);
47 kfree(fb_helper);
48 }
49
50 static const struct fb_ops exynos_drm_fb_ops = {
51 .owner = THIS_MODULE,
52 __FB_DEFAULT_DMAMEM_OPS_RDWR,
53 DRM_FB_HELPER_DEFAULT_OPS,
54 __FB_DEFAULT_DMAMEM_OPS_DRAW,
55 .fb_mmap = exynos_drm_fb_mmap,
56 .fb_destroy = exynos_drm_fb_destroy,
57 };
58
exynos_drm_fbdev_update(struct drm_fb_helper * helper,struct drm_fb_helper_surface_size * sizes,struct exynos_drm_gem * exynos_gem)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->flags |= FBINFO_VIRTFB;
83 fbi->screen_buffer = exynos_gem->kvaddr + offset;
84 fbi->screen_size = size;
85 fbi->fix.smem_len = size;
86
87 return 0;
88 }
89
exynos_drm_fbdev_create(struct drm_fb_helper * helper,struct drm_fb_helper_surface_size * sizes)90 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
91 struct drm_fb_helper_surface_size *sizes)
92 {
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 helper->fb =
117 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
118 if (IS_ERR(helper->fb)) {
119 DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n");
120 ret = PTR_ERR(helper->fb);
121 goto err_destroy_gem;
122 }
123
124 ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
125 if (ret < 0)
126 goto err_destroy_framebuffer;
127
128 return 0;
129
130 err_destroy_framebuffer:
131 drm_framebuffer_cleanup(helper->fb);
132 helper->fb = NULL;
133 err_destroy_gem:
134 exynos_drm_gem_destroy(exynos_gem);
135 return ret;
136 }
137
138 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
139 .fb_probe = exynos_drm_fbdev_create,
140 };
141
142 /*
143 * struct drm_client
144 */
145
exynos_drm_fbdev_client_unregister(struct drm_client_dev * client)146 static void exynos_drm_fbdev_client_unregister(struct drm_client_dev *client)
147 {
148 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
149
150 if (fb_helper->info) {
151 drm_fb_helper_unregister_info(fb_helper);
152 } else {
153 drm_client_release(&fb_helper->client);
154 drm_fb_helper_unprepare(fb_helper);
155 kfree(fb_helper);
156 }
157 }
158
exynos_drm_fbdev_client_restore(struct drm_client_dev * client)159 static int exynos_drm_fbdev_client_restore(struct drm_client_dev *client)
160 {
161 drm_fb_helper_lastclose(client->dev);
162
163 return 0;
164 }
165
exynos_drm_fbdev_client_hotplug(struct drm_client_dev * client)166 static int exynos_drm_fbdev_client_hotplug(struct drm_client_dev *client)
167 {
168 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
169 struct drm_device *dev = client->dev;
170 int ret;
171
172 if (dev->fb_helper)
173 return drm_fb_helper_hotplug_event(dev->fb_helper);
174
175 ret = drm_fb_helper_init(dev, fb_helper);
176 if (ret)
177 goto err_drm_err;
178
179 if (!drm_drv_uses_atomic_modeset(dev))
180 drm_helper_disable_unused_functions(dev);
181
182 ret = drm_fb_helper_initial_config(fb_helper);
183 if (ret)
184 goto err_drm_fb_helper_fini;
185
186 return 0;
187
188 err_drm_fb_helper_fini:
189 drm_fb_helper_fini(fb_helper);
190 err_drm_err:
191 drm_err(dev, "Failed to setup fbdev emulation (ret=%d)\n", ret);
192 return ret;
193 }
194
195 static const struct drm_client_funcs exynos_drm_fbdev_client_funcs = {
196 .owner = THIS_MODULE,
197 .unregister = exynos_drm_fbdev_client_unregister,
198 .restore = exynos_drm_fbdev_client_restore,
199 .hotplug = exynos_drm_fbdev_client_hotplug,
200 };
201
exynos_drm_fbdev_setup(struct drm_device * dev)202 void exynos_drm_fbdev_setup(struct drm_device *dev)
203 {
204 struct drm_fb_helper *fb_helper;
205 int ret;
206
207 drm_WARN(dev, !dev->registered, "Device has not been registered.\n");
208 drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n");
209
210 fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
211 if (!fb_helper)
212 return;
213 drm_fb_helper_prepare(dev, fb_helper, PREFERRED_BPP, &exynos_drm_fb_helper_funcs);
214
215 ret = drm_client_init(dev, &fb_helper->client, "fbdev", &exynos_drm_fbdev_client_funcs);
216 if (ret)
217 goto err_drm_client_init;
218
219 drm_client_register(&fb_helper->client);
220
221 return;
222
223 err_drm_client_init:
224 drm_fb_helper_unprepare(fb_helper);
225 kfree(fb_helper);
226 }
227