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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/* exynos_drm_fbdev.c
2 *
3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * Authors:
5 * Inki Dae <inki.dae@samsung.com>
6 * Joonyoung Shim <jy0922.shim@samsung.com>
7 * Seung-Woo Kim <sw0312.kim@samsung.com>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 */
14
15#include <drm/drmP.h>
16#include <drm/drm_crtc.h>
17#include <drm/drm_fb_helper.h>
18#include <drm/drm_crtc_helper.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#include "exynos_drm_iommu.h"
25
26#define MAX_CONNECTOR 4
27#define PREFERRED_BPP 32
28
29#define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\
30 drm_fb_helper)
31
32struct exynos_drm_fbdev {
33 struct drm_fb_helper drm_fb_helper;
34 struct exynos_drm_gem *exynos_gem;
35};
36
37static int exynos_drm_fb_mmap(struct fb_info *info,
38 struct vm_area_struct *vma)
39{
40 struct drm_fb_helper *helper = info->par;
41 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
42 struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
43 unsigned long vm_size;
44 int ret;
45
46 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
47
48 vm_size = vma->vm_end - vma->vm_start;
49
50 if (vm_size > exynos_gem->size)
51 return -EINVAL;
52
53 ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie,
54 exynos_gem->dma_addr, exynos_gem->size,
55 exynos_gem->dma_attrs);
56 if (ret < 0) {
57 DRM_ERROR("failed to mmap.\n");
58 return ret;
59 }
60
61 return 0;
62}
63
64static struct fb_ops exynos_drm_fb_ops = {
65 .owner = THIS_MODULE,
66 DRM_FB_HELPER_DEFAULT_OPS,
67 .fb_mmap = exynos_drm_fb_mmap,
68 .fb_fillrect = drm_fb_helper_cfb_fillrect,
69 .fb_copyarea = drm_fb_helper_cfb_copyarea,
70 .fb_imageblit = drm_fb_helper_cfb_imageblit,
71};
72
73static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
74 struct drm_fb_helper_surface_size *sizes,
75 struct exynos_drm_gem *exynos_gem)
76{
77 struct fb_info *fbi;
78 struct drm_framebuffer *fb = helper->fb;
79 unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
80 unsigned int nr_pages;
81 unsigned long offset;
82
83 fbi = drm_fb_helper_alloc_fbi(helper);
84 if (IS_ERR(fbi)) {
85 DRM_ERROR("failed to allocate fb info.\n");
86 return PTR_ERR(fbi);
87 }
88
89 fbi->par = helper;
90 fbi->flags = FBINFO_FLAG_DEFAULT;
91 fbi->fbops = &exynos_drm_fb_ops;
92
93 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
94 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
95
96 nr_pages = exynos_gem->size >> PAGE_SHIFT;
97
98 exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages,
99 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
100 if (!exynos_gem->kvaddr) {
101 DRM_ERROR("failed to map pages to kernel space.\n");
102 drm_fb_helper_release_fbi(helper);
103 return -EIO;
104 }
105
106 offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
107 offset += fbi->var.yoffset * fb->pitches[0];
108
109 fbi->screen_base = exynos_gem->kvaddr + offset;
110 fbi->screen_size = size;
111 fbi->fix.smem_len = size;
112
113 return 0;
114}
115
116static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
117 struct drm_fb_helper_surface_size *sizes)
118{
119 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
120 struct exynos_drm_gem *exynos_gem;
121 struct drm_device *dev = helper->dev;
122 struct drm_mode_fb_cmd2 mode_cmd = { 0 };
123 struct platform_device *pdev = dev->platformdev;
124 unsigned long size;
125 int ret;
126
127 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
128 sizes->surface_width, sizes->surface_height,
129 sizes->surface_bpp);
130
131 mode_cmd.width = sizes->surface_width;
132 mode_cmd.height = sizes->surface_height;
133 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
134 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
135 sizes->surface_depth);
136
137 size = mode_cmd.pitches[0] * mode_cmd.height;
138
139 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
140 /*
141 * If physically contiguous memory allocation fails and if IOMMU is
142 * supported then try to get buffer from non physically contiguous
143 * memory area.
144 */
145 if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) {
146 dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
147 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
148 size);
149 }
150
151 if (IS_ERR(exynos_gem))
152 return PTR_ERR(exynos_gem);
153
154 exynos_fbdev->exynos_gem = exynos_gem;
155
156 helper->fb =
157 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
158 if (IS_ERR(helper->fb)) {
159 DRM_ERROR("failed to create drm framebuffer.\n");
160 ret = PTR_ERR(helper->fb);
161 goto err_destroy_gem;
162 }
163
164 ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
165 if (ret < 0)
166 goto err_destroy_framebuffer;
167
168 return ret;
169
170err_destroy_framebuffer:
171 drm_framebuffer_cleanup(helper->fb);
172err_destroy_gem:
173 exynos_drm_gem_destroy(exynos_gem);
174
175 /*
176 * if failed, all resources allocated above would be released by
177 * drm_mode_config_cleanup() when drm_load() had been called prior
178 * to any specific driver such as fimd or hdmi driver.
179 */
180
181 return ret;
182}
183
184static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
185 .fb_probe = exynos_drm_fbdev_create,
186};
187
188static bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev)
189{
190 struct drm_connector *connector;
191 bool ret = false;
192
193 mutex_lock(&dev->mode_config.mutex);
194 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
195 if (connector->status != connector_status_connected)
196 continue;
197
198 ret = true;
199 break;
200 }
201 mutex_unlock(&dev->mode_config.mutex);
202
203 return ret;
204}
205
206int exynos_drm_fbdev_init(struct drm_device *dev)
207{
208 struct exynos_drm_fbdev *fbdev;
209 struct exynos_drm_private *private = dev->dev_private;
210 struct drm_fb_helper *helper;
211 unsigned int num_crtc;
212 int ret;
213
214 if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
215 return 0;
216
217 if (!exynos_drm_fbdev_is_anything_connected(dev))
218 return 0;
219
220 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
221 if (!fbdev)
222 return -ENOMEM;
223
224 private->fb_helper = helper = &fbdev->drm_fb_helper;
225
226 drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
227
228 num_crtc = dev->mode_config.num_crtc;
229
230 ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
231 if (ret < 0) {
232 DRM_ERROR("failed to initialize drm fb helper.\n");
233 goto err_init;
234 }
235
236 ret = drm_fb_helper_single_add_all_connectors(helper);
237 if (ret < 0) {
238 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
239 goto err_setup;
240
241 }
242
243 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
244 if (ret < 0) {
245 DRM_ERROR("failed to set up hw configuration.\n");
246 goto err_setup;
247 }
248
249 return 0;
250
251err_setup:
252 drm_fb_helper_fini(helper);
253
254err_init:
255 private->fb_helper = NULL;
256 kfree(fbdev);
257
258 return ret;
259}
260
261static void exynos_drm_fbdev_destroy(struct drm_device *dev,
262 struct drm_fb_helper *fb_helper)
263{
264 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
265 struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
266 struct drm_framebuffer *fb;
267
268 vunmap(exynos_gem->kvaddr);
269
270 /* release drm framebuffer and real buffer */
271 if (fb_helper->fb && fb_helper->fb->funcs) {
272 fb = fb_helper->fb;
273 if (fb) {
274 drm_framebuffer_unregister_private(fb);
275 drm_framebuffer_remove(fb);
276 }
277 }
278
279 drm_fb_helper_unregister_fbi(fb_helper);
280 drm_fb_helper_release_fbi(fb_helper);
281
282 drm_fb_helper_fini(fb_helper);
283}
284
285void exynos_drm_fbdev_fini(struct drm_device *dev)
286{
287 struct exynos_drm_private *private = dev->dev_private;
288 struct exynos_drm_fbdev *fbdev;
289
290 if (!private || !private->fb_helper)
291 return;
292
293 fbdev = to_exynos_fbdev(private->fb_helper);
294
295 exynos_drm_fbdev_destroy(dev, private->fb_helper);
296 kfree(fbdev);
297 private->fb_helper = NULL;
298}
299
300void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
301{
302 struct exynos_drm_private *private = dev->dev_private;
303
304 if (!private || !private->fb_helper)
305 return;
306
307 drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper);
308}
309
310void exynos_drm_output_poll_changed(struct drm_device *dev)
311{
312 struct exynos_drm_private *private = dev->dev_private;
313 struct drm_fb_helper *fb_helper = private->fb_helper;
314
315 if (fb_helper)
316 drm_fb_helper_hotplug_event(fb_helper);
317 else
318 exynos_drm_fbdev_init(dev);
319}