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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/*
2 * Copyright (C) 2012 Russell King
3 * Written from the i915 driver.
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9#include <linux/errno.h>
10#include <linux/kernel.h>
11#include <linux/module.h>
12
13#include <drm/drmP.h>
14#include <drm/drm_fb_helper.h>
15#include "armada_crtc.h"
16#include "armada_drm.h"
17#include "armada_fb.h"
18#include "armada_gem.h"
19
20static /*const*/ struct fb_ops armada_fb_ops = {
21 .owner = THIS_MODULE,
22 DRM_FB_HELPER_DEFAULT_OPS,
23 .fb_fillrect = drm_fb_helper_cfb_fillrect,
24 .fb_copyarea = drm_fb_helper_cfb_copyarea,
25 .fb_imageblit = drm_fb_helper_cfb_imageblit,
26};
27
28static int armada_fb_create(struct drm_fb_helper *fbh,
29 struct drm_fb_helper_surface_size *sizes)
30{
31 struct drm_device *dev = fbh->dev;
32 struct drm_mode_fb_cmd2 mode;
33 struct armada_framebuffer *dfb;
34 struct armada_gem_object *obj;
35 struct fb_info *info;
36 int size, ret;
37 void *ptr;
38
39 memset(&mode, 0, sizeof(mode));
40 mode.width = sizes->surface_width;
41 mode.height = sizes->surface_height;
42 mode.pitches[0] = armada_pitch(mode.width, sizes->surface_bpp);
43 mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
44 sizes->surface_depth);
45
46 size = mode.pitches[0] * mode.height;
47 obj = armada_gem_alloc_private_object(dev, size);
48 if (!obj) {
49 DRM_ERROR("failed to allocate fb memory\n");
50 return -ENOMEM;
51 }
52
53 ret = armada_gem_linear_back(dev, obj);
54 if (ret) {
55 drm_gem_object_unreference_unlocked(&obj->obj);
56 return ret;
57 }
58
59 ptr = armada_gem_map_object(dev, obj);
60 if (!ptr) {
61 drm_gem_object_unreference_unlocked(&obj->obj);
62 return -ENOMEM;
63 }
64
65 dfb = armada_framebuffer_create(dev, &mode, obj);
66
67 /*
68 * A reference is now held by the framebuffer object if
69 * successful, otherwise this drops the ref for the error path.
70 */
71 drm_gem_object_unreference_unlocked(&obj->obj);
72
73 if (IS_ERR(dfb))
74 return PTR_ERR(dfb);
75
76 info = drm_fb_helper_alloc_fbi(fbh);
77 if (IS_ERR(info)) {
78 ret = PTR_ERR(info);
79 goto err_fballoc;
80 }
81
82 strlcpy(info->fix.id, "armada-drmfb", sizeof(info->fix.id));
83 info->par = fbh;
84 info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
85 info->fbops = &armada_fb_ops;
86 info->fix.smem_start = obj->phys_addr;
87 info->fix.smem_len = obj->obj.size;
88 info->screen_size = obj->obj.size;
89 info->screen_base = ptr;
90 fbh->fb = &dfb->fb;
91
92 drm_fb_helper_fill_fix(info, dfb->fb.pitches[0], dfb->fb.depth);
93 drm_fb_helper_fill_var(info, fbh, sizes->fb_width, sizes->fb_height);
94
95 DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n",
96 dfb->fb.width, dfb->fb.height, dfb->fb.bits_per_pixel,
97 (unsigned long long)obj->phys_addr);
98
99 return 0;
100
101 err_fballoc:
102 dfb->fb.funcs->destroy(&dfb->fb);
103 return ret;
104}
105
106static int armada_fb_probe(struct drm_fb_helper *fbh,
107 struct drm_fb_helper_surface_size *sizes)
108{
109 int ret = 0;
110
111 if (!fbh->fb) {
112 ret = armada_fb_create(fbh, sizes);
113 if (ret == 0)
114 ret = 1;
115 }
116 return ret;
117}
118
119static const struct drm_fb_helper_funcs armada_fb_helper_funcs = {
120 .gamma_set = armada_drm_crtc_gamma_set,
121 .gamma_get = armada_drm_crtc_gamma_get,
122 .fb_probe = armada_fb_probe,
123};
124
125int armada_fbdev_init(struct drm_device *dev)
126{
127 struct armada_private *priv = dev->dev_private;
128 struct drm_fb_helper *fbh;
129 int ret;
130
131 fbh = devm_kzalloc(dev->dev, sizeof(*fbh), GFP_KERNEL);
132 if (!fbh)
133 return -ENOMEM;
134
135 priv->fbdev = fbh;
136
137 drm_fb_helper_prepare(dev, fbh, &armada_fb_helper_funcs);
138
139 ret = drm_fb_helper_init(dev, fbh, 1, 1);
140 if (ret) {
141 DRM_ERROR("failed to initialize drm fb helper\n");
142 goto err_fb_helper;
143 }
144
145 ret = drm_fb_helper_single_add_all_connectors(fbh);
146 if (ret) {
147 DRM_ERROR("failed to add fb connectors\n");
148 goto err_fb_setup;
149 }
150
151 ret = drm_fb_helper_initial_config(fbh, 32);
152 if (ret) {
153 DRM_ERROR("failed to set initial config\n");
154 goto err_fb_setup;
155 }
156
157 return 0;
158 err_fb_setup:
159 drm_fb_helper_release_fbi(fbh);
160 drm_fb_helper_fini(fbh);
161 err_fb_helper:
162 priv->fbdev = NULL;
163 return ret;
164}
165
166void armada_fbdev_lastclose(struct drm_device *dev)
167{
168 struct armada_private *priv = dev->dev_private;
169
170 if (priv->fbdev)
171 drm_fb_helper_restore_fbdev_mode_unlocked(priv->fbdev);
172}
173
174void armada_fbdev_fini(struct drm_device *dev)
175{
176 struct armada_private *priv = dev->dev_private;
177 struct drm_fb_helper *fbh = priv->fbdev;
178
179 if (fbh) {
180 drm_fb_helper_unregister_fbi(fbh);
181 drm_fb_helper_release_fbi(fbh);
182
183 drm_fb_helper_fini(fbh);
184
185 if (fbh->fb)
186 fbh->fb->funcs->destroy(fbh->fb);
187
188 priv->fbdev = NULL;
189 }
190}