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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* exynos_drm_fbdev.c
3 *
4 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
5 * Authors:
6 * Inki Dae <inki.dae@samsung.com>
7 * Joonyoung Shim <jy0922.shim@samsung.com>
8 * Seung-Woo Kim <sw0312.kim@samsung.com>
9 */
10
11#include <linux/fb.h>
12
13#include <drm/drm_crtc_helper.h>
14#include <drm/drm_drv.h>
15#include <drm/drm_fb_helper.h>
16#include <drm/drm_framebuffer.h>
17#include <drm/drm_gem_framebuffer_helper.h>
18#include <drm/drm_prime.h>
19#include <drm/exynos_drm.h>
20
21#include "exynos_drm_drv.h"
22#include "exynos_drm_fb.h"
23#include "exynos_drm_fbdev.h"
24
25#define MAX_CONNECTOR 4
26#define PREFERRED_BPP 32
27
28static int exynos_drm_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
29{
30 struct drm_fb_helper *helper = info->par;
31 struct drm_gem_object *obj = drm_gem_fb_get_obj(helper->fb, 0);
32
33 return drm_gem_prime_mmap(obj, vma);
34}
35
36static void exynos_drm_fb_destroy(struct fb_info *info)
37{
38 struct drm_fb_helper *fb_helper = info->par;
39 struct drm_framebuffer *fb = fb_helper->fb;
40
41 drm_fb_helper_fini(fb_helper);
42
43 drm_framebuffer_remove(fb);
44
45 drm_client_release(&fb_helper->client);
46 drm_fb_helper_unprepare(fb_helper);
47 kfree(fb_helper);
48}
49
50static const struct fb_ops exynos_drm_fb_ops = {
51 .owner = THIS_MODULE,
52 __FB_DEFAULT_DMAMEM_OPS_RDWR,
53 DRM_FB_HELPER_DEFAULT_OPS,
54 __FB_DEFAULT_DMAMEM_OPS_DRAW,
55 .fb_mmap = exynos_drm_fb_mmap,
56 .fb_destroy = exynos_drm_fb_destroy,
57};
58
59static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
60 struct drm_fb_helper_surface_size *sizes,
61 struct exynos_drm_gem *exynos_gem)
62{
63 struct fb_info *fbi;
64 struct drm_framebuffer *fb = helper->fb;
65 unsigned int size = fb->width * fb->height * fb->format->cpp[0];
66 unsigned long offset;
67
68 fbi = drm_fb_helper_alloc_info(helper);
69 if (IS_ERR(fbi)) {
70 DRM_DEV_ERROR(to_dma_dev(helper->dev),
71 "failed to allocate fb info.\n");
72 return PTR_ERR(fbi);
73 }
74
75 fbi->fbops = &exynos_drm_fb_ops;
76
77 drm_fb_helper_fill_info(fbi, helper, sizes);
78
79 offset = fbi->var.xoffset * fb->format->cpp[0];
80 offset += fbi->var.yoffset * fb->pitches[0];
81
82 fbi->flags |= FBINFO_VIRTFB;
83 fbi->screen_buffer = exynos_gem->kvaddr + offset;
84 fbi->screen_size = size;
85 fbi->fix.smem_len = size;
86
87 return 0;
88}
89
90static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
91 struct drm_fb_helper_surface_size *sizes)
92{
93 struct exynos_drm_gem *exynos_gem;
94 struct drm_device *dev = helper->dev;
95 struct drm_mode_fb_cmd2 mode_cmd = { 0 };
96 unsigned long size;
97 int ret;
98
99 DRM_DEV_DEBUG_KMS(dev->dev,
100 "surface width(%d), height(%d) and bpp(%d\n",
101 sizes->surface_width, sizes->surface_height,
102 sizes->surface_bpp);
103
104 mode_cmd.width = sizes->surface_width;
105 mode_cmd.height = sizes->surface_height;
106 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
107 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
108 sizes->surface_depth);
109
110 size = mode_cmd.pitches[0] * mode_cmd.height;
111
112 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_WC, size, true);
113 if (IS_ERR(exynos_gem))
114 return PTR_ERR(exynos_gem);
115
116 helper->fb =
117 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
118 if (IS_ERR(helper->fb)) {
119 DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n");
120 ret = PTR_ERR(helper->fb);
121 goto err_destroy_gem;
122 }
123
124 ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
125 if (ret < 0)
126 goto err_destroy_framebuffer;
127
128 return 0;
129
130err_destroy_framebuffer:
131 drm_framebuffer_cleanup(helper->fb);
132 helper->fb = NULL;
133err_destroy_gem:
134 exynos_drm_gem_destroy(exynos_gem);
135 return ret;
136}
137
138static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
139 .fb_probe = exynos_drm_fbdev_create,
140};
141
142/*
143 * struct drm_client
144 */
145
146static void exynos_drm_fbdev_client_unregister(struct drm_client_dev *client)
147{
148 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
149
150 if (fb_helper->info) {
151 drm_fb_helper_unregister_info(fb_helper);
152 } else {
153 drm_client_release(&fb_helper->client);
154 drm_fb_helper_unprepare(fb_helper);
155 kfree(fb_helper);
156 }
157}
158
159static int exynos_drm_fbdev_client_restore(struct drm_client_dev *client)
160{
161 drm_fb_helper_lastclose(client->dev);
162
163 return 0;
164}
165
166static int exynos_drm_fbdev_client_hotplug(struct drm_client_dev *client)
167{
168 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
169 struct drm_device *dev = client->dev;
170 int ret;
171
172 if (dev->fb_helper)
173 return drm_fb_helper_hotplug_event(dev->fb_helper);
174
175 ret = drm_fb_helper_init(dev, fb_helper);
176 if (ret)
177 goto err_drm_err;
178
179 if (!drm_drv_uses_atomic_modeset(dev))
180 drm_helper_disable_unused_functions(dev);
181
182 ret = drm_fb_helper_initial_config(fb_helper);
183 if (ret)
184 goto err_drm_fb_helper_fini;
185
186 return 0;
187
188err_drm_fb_helper_fini:
189 drm_fb_helper_fini(fb_helper);
190err_drm_err:
191 drm_err(dev, "Failed to setup fbdev emulation (ret=%d)\n", ret);
192 return ret;
193}
194
195static const struct drm_client_funcs exynos_drm_fbdev_client_funcs = {
196 .owner = THIS_MODULE,
197 .unregister = exynos_drm_fbdev_client_unregister,
198 .restore = exynos_drm_fbdev_client_restore,
199 .hotplug = exynos_drm_fbdev_client_hotplug,
200};
201
202void exynos_drm_fbdev_setup(struct drm_device *dev)
203{
204 struct drm_fb_helper *fb_helper;
205 int ret;
206
207 drm_WARN(dev, !dev->registered, "Device has not been registered.\n");
208 drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n");
209
210 fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
211 if (!fb_helper)
212 return;
213 drm_fb_helper_prepare(dev, fb_helper, PREFERRED_BPP, &exynos_drm_fb_helper_funcs);
214
215 ret = drm_client_init(dev, &fb_helper->client, "fbdev", &exynos_drm_fbdev_client_funcs);
216 if (ret)
217 goto err_drm_client_init;
218
219 drm_client_register(&fb_helper->client);
220
221 return;
222
223err_drm_client_init:
224 drm_fb_helper_unprepare(fb_helper);
225 kfree(fb_helper);
226}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* exynos_drm_fbdev.c
3 *
4 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
5 * Authors:
6 * Inki Dae <inki.dae@samsung.com>
7 * Joonyoung Shim <jy0922.shim@samsung.com>
8 * Seung-Woo Kim <sw0312.kim@samsung.com>
9 */
10
11#include <linux/console.h>
12#include <linux/dma-mapping.h>
13#include <linux/vmalloc.h>
14
15#include <drm/drm_crtc.h>
16#include <drm/drm_fb_helper.h>
17#include <drm/drm_fourcc.h>
18#include <drm/drm_framebuffer.h>
19#include <drm/drm_prime.h>
20#include <drm/drm_probe_helper.h>
21#include <drm/exynos_drm.h>
22
23#include "exynos_drm_drv.h"
24#include "exynos_drm_fb.h"
25#include "exynos_drm_fbdev.h"
26
27#define MAX_CONNECTOR 4
28#define PREFERRED_BPP 32
29
30#define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\
31 drm_fb_helper)
32
33struct exynos_drm_fbdev {
34 struct drm_fb_helper drm_fb_helper;
35 struct exynos_drm_gem *exynos_gem;
36};
37
38static int exynos_drm_fb_mmap(struct fb_info *info,
39 struct vm_area_struct *vma)
40{
41 struct drm_fb_helper *helper = info->par;
42 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
43 struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
44
45 return drm_gem_prime_mmap(&exynos_gem->base, vma);
46}
47
48static const struct fb_ops exynos_drm_fb_ops = {
49 .owner = THIS_MODULE,
50 DRM_FB_HELPER_DEFAULT_OPS,
51 .fb_mmap = exynos_drm_fb_mmap,
52 .fb_read = drm_fb_helper_cfb_read,
53 .fb_write = drm_fb_helper_cfb_write,
54 .fb_fillrect = drm_fb_helper_cfb_fillrect,
55 .fb_copyarea = drm_fb_helper_cfb_copyarea,
56 .fb_imageblit = drm_fb_helper_cfb_imageblit,
57};
58
59static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
60 struct drm_fb_helper_surface_size *sizes,
61 struct exynos_drm_gem *exynos_gem)
62{
63 struct fb_info *fbi;
64 struct drm_framebuffer *fb = helper->fb;
65 unsigned int size = fb->width * fb->height * fb->format->cpp[0];
66 unsigned long offset;
67
68 fbi = drm_fb_helper_alloc_info(helper);
69 if (IS_ERR(fbi)) {
70 DRM_DEV_ERROR(to_dma_dev(helper->dev),
71 "failed to allocate fb info.\n");
72 return PTR_ERR(fbi);
73 }
74
75 fbi->fbops = &exynos_drm_fb_ops;
76
77 drm_fb_helper_fill_info(fbi, helper, sizes);
78
79 offset = fbi->var.xoffset * fb->format->cpp[0];
80 offset += fbi->var.yoffset * fb->pitches[0];
81
82 fbi->screen_buffer = exynos_gem->kvaddr + offset;
83 fbi->screen_size = size;
84 fbi->fix.smem_len = size;
85
86 return 0;
87}
88
89static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
90 struct drm_fb_helper_surface_size *sizes)
91{
92 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
93 struct exynos_drm_gem *exynos_gem;
94 struct drm_device *dev = helper->dev;
95 struct drm_mode_fb_cmd2 mode_cmd = { 0 };
96 unsigned long size;
97 int ret;
98
99 DRM_DEV_DEBUG_KMS(dev->dev,
100 "surface width(%d), height(%d) and bpp(%d\n",
101 sizes->surface_width, sizes->surface_height,
102 sizes->surface_bpp);
103
104 mode_cmd.width = sizes->surface_width;
105 mode_cmd.height = sizes->surface_height;
106 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
107 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
108 sizes->surface_depth);
109
110 size = mode_cmd.pitches[0] * mode_cmd.height;
111
112 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_WC, size, true);
113 if (IS_ERR(exynos_gem))
114 return PTR_ERR(exynos_gem);
115
116 exynos_fbdev->exynos_gem = exynos_gem;
117
118 helper->fb =
119 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
120 if (IS_ERR(helper->fb)) {
121 DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n");
122 ret = PTR_ERR(helper->fb);
123 goto err_destroy_gem;
124 }
125
126 ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
127 if (ret < 0)
128 goto err_destroy_framebuffer;
129
130 return ret;
131
132err_destroy_framebuffer:
133 drm_framebuffer_cleanup(helper->fb);
134err_destroy_gem:
135 exynos_drm_gem_destroy(exynos_gem);
136
137 /*
138 * if failed, all resources allocated above would be released by
139 * drm_mode_config_cleanup() when drm_load() had been called prior
140 * to any specific driver such as fimd or hdmi driver.
141 */
142
143 return ret;
144}
145
146static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
147 .fb_probe = exynos_drm_fbdev_create,
148};
149
150int exynos_drm_fbdev_init(struct drm_device *dev)
151{
152 struct exynos_drm_fbdev *fbdev;
153 struct exynos_drm_private *private = dev->dev_private;
154 struct drm_fb_helper *helper;
155 int ret;
156
157 if (!dev->mode_config.num_crtc)
158 return 0;
159
160 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
161 if (!fbdev)
162 return -ENOMEM;
163
164 private->fb_helper = helper = &fbdev->drm_fb_helper;
165
166 drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
167
168 ret = drm_fb_helper_init(dev, helper);
169 if (ret < 0) {
170 DRM_DEV_ERROR(dev->dev,
171 "failed to initialize drm fb helper.\n");
172 goto err_init;
173 }
174
175 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
176 if (ret < 0) {
177 DRM_DEV_ERROR(dev->dev,
178 "failed to set up hw configuration.\n");
179 goto err_setup;
180 }
181
182 return 0;
183
184err_setup:
185 drm_fb_helper_fini(helper);
186
187err_init:
188 private->fb_helper = NULL;
189 kfree(fbdev);
190
191 return ret;
192}
193
194static void exynos_drm_fbdev_destroy(struct drm_device *dev,
195 struct drm_fb_helper *fb_helper)
196{
197 struct drm_framebuffer *fb;
198
199 /* release drm framebuffer and real buffer */
200 if (fb_helper->fb && fb_helper->fb->funcs) {
201 fb = fb_helper->fb;
202 if (fb)
203 drm_framebuffer_remove(fb);
204 }
205
206 drm_fb_helper_unregister_info(fb_helper);
207
208 drm_fb_helper_fini(fb_helper);
209}
210
211void exynos_drm_fbdev_fini(struct drm_device *dev)
212{
213 struct exynos_drm_private *private = dev->dev_private;
214 struct exynos_drm_fbdev *fbdev;
215
216 if (!private || !private->fb_helper)
217 return;
218
219 fbdev = to_exynos_fbdev(private->fb_helper);
220
221 exynos_drm_fbdev_destroy(dev, private->fb_helper);
222 kfree(fbdev);
223 private->fb_helper = NULL;
224}
225