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_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
armada_fbdev_create(struct drm_fb_helper * fbh,struct drm_fb_helper_surface_size * sizes)29 static 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
armada_fb_probe(struct drm_fb_helper * fbh,struct drm_fb_helper_surface_size * sizes)103 static 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
116 static const struct drm_fb_helper_funcs armada_fb_helper_funcs = {
117 .fb_probe = armada_fb_probe,
118 };
119
armada_fbdev_init(struct drm_device * dev)120 int 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, 32, &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);
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 drm_fb_helper_unprepare(fbh);
151 priv->fbdev = NULL;
152 return ret;
153 }
154
armada_fbdev_fini(struct drm_device * dev)155 void armada_fbdev_fini(struct drm_device *dev)
156 {
157 struct armada_private *priv = drm_to_armada_dev(dev);
158 struct drm_fb_helper *fbh = priv->fbdev;
159
160 if (fbh) {
161 drm_fb_helper_unregister_info(fbh);
162
163 drm_fb_helper_fini(fbh);
164
165 if (fbh->fb)
166 fbh->fb->funcs->destroy(fbh->fb);
167
168 drm_fb_helper_unprepare(fbh);
169
170 priv->fbdev = NULL;
171 }
172 }
173