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
22static void armada_fbdev_fb_destroy(struct fb_info *info)
23{
24 struct drm_fb_helper *fbh = info->par;
25
26 drm_fb_helper_fini(helper: fbh);
27
28 fbh->fb->funcs->destroy(fbh->fb);
29
30 drm_client_release(client: &fbh->client);
31 drm_fb_helper_unprepare(fb_helper: fbh);
32 kfree(objp: fbh);
33}
34
35static 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
42static 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(width: mode.width, bpp: sizes->surface_bpp);
57 mode.pixel_format = drm_mode_legacy_fb_format(bpp: sizes->surface_bpp,
58 depth: 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->obj);
70 return ret;
71 }
72
73 ptr = armada_gem_map_object(dev, obj);
74 if (!ptr) {
75 drm_gem_object_put(obj: &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->obj);
86
87 if (IS_ERR(ptr: dfb))
88 return PTR_ERR(ptr: dfb);
89
90 info = drm_fb_helper_alloc_info(fb_helper: fbh);
91 if (IS_ERR(ptr: info)) {
92 ret = PTR_ERR(ptr: 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, fb_helper: 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
116static 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
129static 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
137static 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(fb_helper: fbh);
143 } else {
144 drm_client_release(client: &fbh->client);
145 drm_fb_helper_unprepare(fb_helper: fbh);
146 kfree(objp: fbh);
147 }
148}
149
150static int armada_fbdev_client_restore(struct drm_client_dev *client)
151{
152 drm_fb_helper_lastclose(dev: client->dev);
153
154 return 0;
155}
156
157static 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(fb_helper: dev->fb_helper);
165
166 ret = drm_fb_helper_init(dev, helper: 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(fb_helper: fbh);
174 if (ret)
175 goto err_drm_fb_helper_fini;
176
177 return 0;
178
179err_drm_fb_helper_fini:
180 drm_fb_helper_fini(helper: fbh);
181err_drm_err:
182 drm_err(dev, "armada: Failed to setup fbdev emulation (ret=%d)\n", ret);
183 return ret;
184}
185
186static 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
193void 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(size: sizeof(*fbh), GFP_KERNEL);
202 if (!fbh)
203 return;
204 drm_fb_helper_prepare(dev, helper: fbh, preferred_bpp: 32, funcs: &armada_fb_helper_funcs);
205
206 ret = drm_client_init(dev, client: &fbh->client, name: "fbdev", funcs: &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(client: &fbh->client);
213
214 return;
215
216err_drm_client_init:
217 drm_fb_helper_unprepare(fb_helper: fbh);
218 kfree(objp: fbh);
219 return;
220}
221

source code of linux/drivers/gpu/drm/armada/armada_fbdev.c