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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(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
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(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
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(fbh);
143 } else {
144 drm_client_release(&fbh->client);
145 drm_fb_helper_unprepare(fbh);
146 kfree(fbh);
147 }
148}
149
150static int armada_fbdev_client_restore(struct drm_client_dev *client)
151{
152 drm_fb_helper_lastclose(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(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
179err_drm_fb_helper_fini:
180 drm_fb_helper_fini(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(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
216err_drm_client_init:
217 drm_fb_helper_unprepare(fbh);
218 kfree(fbh);
219 return;
220}
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/kernel.h>
9#include <linux/module.h>
10
11#include <drm/drm_fb_helper.h>
12#include <drm/drm_fourcc.h>
13
14#include "armada_crtc.h"
15#include "armada_drm.h"
16#include "armada_fb.h"
17#include "armada_gem.h"
18
19static const struct fb_ops armada_fb_ops = {
20 .owner = THIS_MODULE,
21 DRM_FB_HELPER_DEFAULT_OPS,
22 .fb_read = drm_fb_helper_cfb_read,
23 .fb_write = drm_fb_helper_cfb_write,
24 .fb_fillrect = drm_fb_helper_cfb_fillrect,
25 .fb_copyarea = drm_fb_helper_cfb_copyarea,
26 .fb_imageblit = drm_fb_helper_cfb_imageblit,
27};
28
29static int armada_fbdev_create(struct drm_fb_helper *fbh,
30 struct drm_fb_helper_surface_size *sizes)
31{
32 struct drm_device *dev = fbh->dev;
33 struct drm_mode_fb_cmd2 mode;
34 struct armada_framebuffer *dfb;
35 struct armada_gem_object *obj;
36 struct fb_info *info;
37 int size, ret;
38 void *ptr;
39
40 memset(&mode, 0, sizeof(mode));
41 mode.width = sizes->surface_width;
42 mode.height = sizes->surface_height;
43 mode.pitches[0] = armada_pitch(mode.width, sizes->surface_bpp);
44 mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
45 sizes->surface_depth);
46
47 size = mode.pitches[0] * mode.height;
48 obj = armada_gem_alloc_private_object(dev, size);
49 if (!obj) {
50 DRM_ERROR("failed to allocate fb memory\n");
51 return -ENOMEM;
52 }
53
54 ret = armada_gem_linear_back(dev, obj);
55 if (ret) {
56 drm_gem_object_put(&obj->obj);
57 return ret;
58 }
59
60 ptr = armada_gem_map_object(dev, obj);
61 if (!ptr) {
62 drm_gem_object_put(&obj->obj);
63 return -ENOMEM;
64 }
65
66 dfb = armada_framebuffer_create(dev, &mode, obj);
67
68 /*
69 * A reference is now held by the framebuffer object if
70 * successful, otherwise this drops the ref for the error path.
71 */
72 drm_gem_object_put(&obj->obj);
73
74 if (IS_ERR(dfb))
75 return PTR_ERR(dfb);
76
77 info = drm_fb_helper_alloc_info(fbh);
78 if (IS_ERR(info)) {
79 ret = PTR_ERR(info);
80 goto err_fballoc;
81 }
82
83 info->fbops = &armada_fb_ops;
84 info->fix.smem_start = obj->phys_addr;
85 info->fix.smem_len = obj->obj.size;
86 info->screen_size = obj->obj.size;
87 info->screen_base = ptr;
88 fbh->fb = &dfb->fb;
89
90 drm_fb_helper_fill_info(info, fbh, sizes);
91
92 DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n",
93 dfb->fb.width, dfb->fb.height, dfb->fb.format->cpp[0] * 8,
94 (unsigned long long)obj->phys_addr);
95
96 return 0;
97
98 err_fballoc:
99 dfb->fb.funcs->destroy(&dfb->fb);
100 return ret;
101}
102
103static int armada_fb_probe(struct drm_fb_helper *fbh,
104 struct drm_fb_helper_surface_size *sizes)
105{
106 int ret = 0;
107
108 if (!fbh->fb) {
109 ret = armada_fbdev_create(fbh, sizes);
110 if (ret == 0)
111 ret = 1;
112 }
113 return ret;
114}
115
116static const struct drm_fb_helper_funcs armada_fb_helper_funcs = {
117 .fb_probe = armada_fb_probe,
118};
119
120int armada_fbdev_init(struct drm_device *dev)
121{
122 struct armada_private *priv = drm_to_armada_dev(dev);
123 struct drm_fb_helper *fbh;
124 int ret;
125
126 fbh = devm_kzalloc(dev->dev, sizeof(*fbh), GFP_KERNEL);
127 if (!fbh)
128 return -ENOMEM;
129
130 priv->fbdev = fbh;
131
132 drm_fb_helper_prepare(dev, fbh, &armada_fb_helper_funcs);
133
134 ret = drm_fb_helper_init(dev, fbh);
135 if (ret) {
136 DRM_ERROR("failed to initialize drm fb helper\n");
137 goto err_fb_helper;
138 }
139
140 ret = drm_fb_helper_initial_config(fbh, 32);
141 if (ret) {
142 DRM_ERROR("failed to set initial config\n");
143 goto err_fb_setup;
144 }
145
146 return 0;
147 err_fb_setup:
148 drm_fb_helper_fini(fbh);
149 err_fb_helper:
150 priv->fbdev = NULL;
151 return ret;
152}
153
154void armada_fbdev_fini(struct drm_device *dev)
155{
156 struct armada_private *priv = drm_to_armada_dev(dev);
157 struct drm_fb_helper *fbh = priv->fbdev;
158
159 if (fbh) {
160 drm_fb_helper_unregister_info(fbh);
161
162 drm_fb_helper_fini(fbh);
163
164 if (fbh->fb)
165 fbh->fb->funcs->destroy(fbh->fb);
166
167 priv->fbdev = NULL;
168 }
169}