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
19 static /*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
armada_fbdev_create(struct drm_fb_helper * fbh,struct drm_fb_helper_surface_size * sizes)27 static 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_unlocked(&obj->obj);
55 return ret;
56 }
57
58 ptr = armada_gem_map_object(dev, obj);
59 if (!ptr) {
60 drm_gem_object_put_unlocked(&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_unlocked(&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
armada_fb_probe(struct drm_fb_helper * fbh,struct drm_fb_helper_surface_size * sizes)101 static 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
114 static const struct drm_fb_helper_funcs armada_fb_helper_funcs = {
115 .fb_probe = armada_fb_probe,
116 };
117
armada_fbdev_init(struct drm_device * dev)118 int 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, 1);
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_single_add_all_connectors(fbh);
139 if (ret) {
140 DRM_ERROR("failed to add fb connectors\n");
141 goto err_fb_setup;
142 }
143
144 ret = drm_fb_helper_initial_config(fbh, 32);
145 if (ret) {
146 DRM_ERROR("failed to set initial config\n");
147 goto err_fb_setup;
148 }
149
150 return 0;
151 err_fb_setup:
152 drm_fb_helper_fini(fbh);
153 err_fb_helper:
154 priv->fbdev = NULL;
155 return ret;
156 }
157
armada_fbdev_fini(struct drm_device * dev)158 void armada_fbdev_fini(struct drm_device *dev)
159 {
160 struct armada_private *priv = dev->dev_private;
161 struct drm_fb_helper *fbh = priv->fbdev;
162
163 if (fbh) {
164 drm_fb_helper_unregister_fbi(fbh);
165
166 drm_fb_helper_fini(fbh);
167
168 if (fbh->fb)
169 fbh->fb->funcs->destroy(fbh->fb);
170
171 priv->fbdev = NULL;
172 }
173 }
174