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