1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2012 Russell King
4 * Written from the i915 driver.
5 */
6
7 #include <linux/errno.h>
8 #include <linux/fb.h>
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11
12 #include <drm/drm_crtc_helper.h>
13 #include <drm/drm_drv.h>
14 #include <drm/drm_fb_helper.h>
15 #include <drm/drm_fourcc.h>
16
17 #include "armada_crtc.h"
18 #include "armada_drm.h"
19 #include "armada_fb.h"
20 #include "armada_gem.h"
21
armada_fbdev_fb_destroy(struct fb_info * info)22 static void armada_fbdev_fb_destroy(struct fb_info *info)
23 {
24 struct drm_fb_helper *fbh = info->par;
25
26 drm_fb_helper_fini(fbh);
27
28 fbh->fb->funcs->destroy(fbh->fb);
29
30 drm_client_release(&fbh->client);
31 drm_fb_helper_unprepare(fbh);
32 kfree(fbh);
33 }
34
35 static const struct fb_ops armada_fb_ops = {
36 .owner = THIS_MODULE,
37 FB_DEFAULT_IOMEM_OPS,
38 DRM_FB_HELPER_DEFAULT_OPS,
39 .fb_destroy = armada_fbdev_fb_destroy,
40 };
41
armada_fbdev_create(struct drm_fb_helper * fbh,struct drm_fb_helper_surface_size * sizes)42 static int armada_fbdev_create(struct drm_fb_helper *fbh,
43 struct drm_fb_helper_surface_size *sizes)
44 {
45 struct drm_device *dev = fbh->dev;
46 struct drm_mode_fb_cmd2 mode;
47 struct armada_framebuffer *dfb;
48 struct armada_gem_object *obj;
49 struct fb_info *info;
50 int size, ret;
51 void *ptr;
52
53 memset(&mode, 0, sizeof(mode));
54 mode.width = sizes->surface_width;
55 mode.height = sizes->surface_height;
56 mode.pitches[0] = armada_pitch(mode.width, sizes->surface_bpp);
57 mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
58 sizes->surface_depth);
59
60 size = mode.pitches[0] * mode.height;
61 obj = armada_gem_alloc_private_object(dev, size);
62 if (!obj) {
63 DRM_ERROR("failed to allocate fb memory\n");
64 return -ENOMEM;
65 }
66
67 ret = armada_gem_linear_back(dev, obj);
68 if (ret) {
69 drm_gem_object_put(&obj->obj);
70 return ret;
71 }
72
73 ptr = armada_gem_map_object(dev, obj);
74 if (!ptr) {
75 drm_gem_object_put(&obj->obj);
76 return -ENOMEM;
77 }
78
79 dfb = armada_framebuffer_create(dev, &mode, obj);
80
81 /*
82 * A reference is now held by the framebuffer object if
83 * successful, otherwise this drops the ref for the error path.
84 */
85 drm_gem_object_put(&obj->obj);
86
87 if (IS_ERR(dfb))
88 return PTR_ERR(dfb);
89
90 info = drm_fb_helper_alloc_info(fbh);
91 if (IS_ERR(info)) {
92 ret = PTR_ERR(info);
93 goto err_fballoc;
94 }
95
96 info->fbops = &armada_fb_ops;
97 info->fix.smem_start = obj->phys_addr;
98 info->fix.smem_len = obj->obj.size;
99 info->screen_size = obj->obj.size;
100 info->screen_base = ptr;
101 fbh->fb = &dfb->fb;
102
103 drm_fb_helper_fill_info(info, fbh, sizes);
104
105 DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n",
106 dfb->fb.width, dfb->fb.height, dfb->fb.format->cpp[0] * 8,
107 (unsigned long long)obj->phys_addr);
108
109 return 0;
110
111 err_fballoc:
112 dfb->fb.funcs->destroy(&dfb->fb);
113 return ret;
114 }
115
armada_fb_probe(struct drm_fb_helper * fbh,struct drm_fb_helper_surface_size * sizes)116 static int armada_fb_probe(struct drm_fb_helper *fbh,
117 struct drm_fb_helper_surface_size *sizes)
118 {
119 int ret = 0;
120
121 if (!fbh->fb) {
122 ret = armada_fbdev_create(fbh, sizes);
123 if (ret == 0)
124 ret = 1;
125 }
126 return ret;
127 }
128
129 static const struct drm_fb_helper_funcs armada_fb_helper_funcs = {
130 .fb_probe = armada_fb_probe,
131 };
132
133 /*
134 * Fbdev client and struct drm_client_funcs
135 */
136
armada_fbdev_client_unregister(struct drm_client_dev * client)137 static void armada_fbdev_client_unregister(struct drm_client_dev *client)
138 {
139 struct drm_fb_helper *fbh = drm_fb_helper_from_client(client);
140
141 if (fbh->info) {
142 drm_fb_helper_unregister_info(fbh);
143 } else {
144 drm_client_release(&fbh->client);
145 drm_fb_helper_unprepare(fbh);
146 kfree(fbh);
147 }
148 }
149
armada_fbdev_client_restore(struct drm_client_dev * client)150 static int armada_fbdev_client_restore(struct drm_client_dev *client)
151 {
152 drm_fb_helper_lastclose(client->dev);
153
154 return 0;
155 }
156
armada_fbdev_client_hotplug(struct drm_client_dev * client)157 static int armada_fbdev_client_hotplug(struct drm_client_dev *client)
158 {
159 struct drm_fb_helper *fbh = drm_fb_helper_from_client(client);
160 struct drm_device *dev = client->dev;
161 int ret;
162
163 if (dev->fb_helper)
164 return drm_fb_helper_hotplug_event(dev->fb_helper);
165
166 ret = drm_fb_helper_init(dev, fbh);
167 if (ret)
168 goto err_drm_err;
169
170 if (!drm_drv_uses_atomic_modeset(dev))
171 drm_helper_disable_unused_functions(dev);
172
173 ret = drm_fb_helper_initial_config(fbh);
174 if (ret)
175 goto err_drm_fb_helper_fini;
176
177 return 0;
178
179 err_drm_fb_helper_fini:
180 drm_fb_helper_fini(fbh);
181 err_drm_err:
182 drm_err(dev, "armada: Failed to setup fbdev emulation (ret=%d)\n", ret);
183 return ret;
184 }
185
186 static const struct drm_client_funcs armada_fbdev_client_funcs = {
187 .owner = THIS_MODULE,
188 .unregister = armada_fbdev_client_unregister,
189 .restore = armada_fbdev_client_restore,
190 .hotplug = armada_fbdev_client_hotplug,
191 };
192
armada_fbdev_setup(struct drm_device * dev)193 void armada_fbdev_setup(struct drm_device *dev)
194 {
195 struct drm_fb_helper *fbh;
196 int ret;
197
198 drm_WARN(dev, !dev->registered, "Device has not been registered.\n");
199 drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n");
200
201 fbh = kzalloc(sizeof(*fbh), GFP_KERNEL);
202 if (!fbh)
203 return;
204 drm_fb_helper_prepare(dev, fbh, 32, &armada_fb_helper_funcs);
205
206 ret = drm_client_init(dev, &fbh->client, "fbdev", &armada_fbdev_client_funcs);
207 if (ret) {
208 drm_err(dev, "Failed to register client: %d\n", ret);
209 goto err_drm_client_init;
210 }
211
212 drm_client_register(&fbh->client);
213
214 return;
215
216 err_drm_client_init:
217 drm_fb_helper_unprepare(fbh);
218 kfree(fbh);
219 return;
220 }
221