1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2012-2013 Avionic Design GmbH
4 * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
5 *
6 * Based on the KMS/FB CMA helpers
7 * Copyright (C) 2012 Analog Devices Inc.
8 */
9
10 #include <linux/console.h>
11
12 #include <drm/drm_fourcc.h>
13 #include <drm/drm_gem_framebuffer_helper.h>
14 #include <drm/drm_modeset_helper.h>
15
16 #include "drm.h"
17 #include "gem.h"
18
19 #ifdef CONFIG_DRM_FBDEV_EMULATION
to_tegra_fbdev(struct drm_fb_helper * helper)20 static inline struct tegra_fbdev *to_tegra_fbdev(struct drm_fb_helper *helper)
21 {
22 return container_of(helper, struct tegra_fbdev, base);
23 }
24 #endif
25
tegra_fb_get_plane(struct drm_framebuffer * framebuffer,unsigned int index)26 struct tegra_bo *tegra_fb_get_plane(struct drm_framebuffer *framebuffer,
27 unsigned int index)
28 {
29 return to_tegra_bo(drm_gem_fb_get_obj(framebuffer, index));
30 }
31
tegra_fb_is_bottom_up(struct drm_framebuffer * framebuffer)32 bool tegra_fb_is_bottom_up(struct drm_framebuffer *framebuffer)
33 {
34 struct tegra_bo *bo = tegra_fb_get_plane(framebuffer, 0);
35
36 if (bo->flags & TEGRA_BO_BOTTOM_UP)
37 return true;
38
39 return false;
40 }
41
tegra_fb_get_tiling(struct drm_framebuffer * framebuffer,struct tegra_bo_tiling * tiling)42 int tegra_fb_get_tiling(struct drm_framebuffer *framebuffer,
43 struct tegra_bo_tiling *tiling)
44 {
45 uint64_t modifier = framebuffer->modifier;
46
47 switch (modifier) {
48 case DRM_FORMAT_MOD_LINEAR:
49 tiling->mode = TEGRA_BO_TILING_MODE_PITCH;
50 tiling->value = 0;
51 break;
52
53 case DRM_FORMAT_MOD_NVIDIA_TEGRA_TILED:
54 tiling->mode = TEGRA_BO_TILING_MODE_TILED;
55 tiling->value = 0;
56 break;
57
58 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(0):
59 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
60 tiling->value = 0;
61 break;
62
63 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(1):
64 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
65 tiling->value = 1;
66 break;
67
68 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(2):
69 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
70 tiling->value = 2;
71 break;
72
73 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(3):
74 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
75 tiling->value = 3;
76 break;
77
78 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(4):
79 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
80 tiling->value = 4;
81 break;
82
83 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(5):
84 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
85 tiling->value = 5;
86 break;
87
88 default:
89 return -EINVAL;
90 }
91
92 return 0;
93 }
94
95 static const struct drm_framebuffer_funcs tegra_fb_funcs = {
96 .destroy = drm_gem_fb_destroy,
97 .create_handle = drm_gem_fb_create_handle,
98 };
99
tegra_fb_alloc(struct drm_device * drm,const struct drm_mode_fb_cmd2 * mode_cmd,struct tegra_bo ** planes,unsigned int num_planes)100 static struct drm_framebuffer *tegra_fb_alloc(struct drm_device *drm,
101 const struct drm_mode_fb_cmd2 *mode_cmd,
102 struct tegra_bo **planes,
103 unsigned int num_planes)
104 {
105 struct drm_framebuffer *fb;
106 unsigned int i;
107 int err;
108
109 fb = kzalloc(sizeof(*fb), GFP_KERNEL);
110 if (!fb)
111 return ERR_PTR(-ENOMEM);
112
113 drm_helper_mode_fill_fb_struct(drm, fb, mode_cmd);
114
115 for (i = 0; i < fb->format->num_planes; i++)
116 fb->obj[i] = &planes[i]->gem;
117
118 err = drm_framebuffer_init(drm, fb, &tegra_fb_funcs);
119 if (err < 0) {
120 dev_err(drm->dev, "failed to initialize framebuffer: %d\n",
121 err);
122 kfree(fb);
123 return ERR_PTR(err);
124 }
125
126 return fb;
127 }
128
tegra_fb_create(struct drm_device * drm,struct drm_file * file,const struct drm_mode_fb_cmd2 * cmd)129 struct drm_framebuffer *tegra_fb_create(struct drm_device *drm,
130 struct drm_file *file,
131 const struct drm_mode_fb_cmd2 *cmd)
132 {
133 const struct drm_format_info *info = drm_get_format_info(drm, cmd);
134 struct tegra_bo *planes[4];
135 struct drm_gem_object *gem;
136 struct drm_framebuffer *fb;
137 unsigned int i;
138 int err;
139
140 for (i = 0; i < info->num_planes; i++) {
141 unsigned int width = cmd->width / (i ? info->hsub : 1);
142 unsigned int height = cmd->height / (i ? info->vsub : 1);
143 unsigned int size, bpp;
144
145 gem = drm_gem_object_lookup(file, cmd->handles[i]);
146 if (!gem) {
147 err = -ENXIO;
148 goto unreference;
149 }
150
151 bpp = info->cpp[i];
152
153 size = (height - 1) * cmd->pitches[i] +
154 width * bpp + cmd->offsets[i];
155
156 if (gem->size < size) {
157 err = -EINVAL;
158 goto unreference;
159 }
160
161 planes[i] = to_tegra_bo(gem);
162 }
163
164 fb = tegra_fb_alloc(drm, cmd, planes, i);
165 if (IS_ERR(fb)) {
166 err = PTR_ERR(fb);
167 goto unreference;
168 }
169
170 return fb;
171
172 unreference:
173 while (i--)
174 drm_gem_object_put(&planes[i]->gem);
175
176 return ERR_PTR(err);
177 }
178
179 #ifdef CONFIG_DRM_FBDEV_EMULATION
tegra_fb_mmap(struct fb_info * info,struct vm_area_struct * vma)180 static int tegra_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
181 {
182 struct drm_fb_helper *helper = info->par;
183 struct tegra_bo *bo;
184 int err;
185
186 bo = tegra_fb_get_plane(helper->fb, 0);
187
188 err = drm_gem_mmap_obj(&bo->gem, bo->gem.size, vma);
189 if (err < 0)
190 return err;
191
192 return __tegra_gem_mmap(&bo->gem, vma);
193 }
194
195 static const struct fb_ops tegra_fb_ops = {
196 .owner = THIS_MODULE,
197 DRM_FB_HELPER_DEFAULT_OPS,
198 .fb_fillrect = drm_fb_helper_sys_fillrect,
199 .fb_copyarea = drm_fb_helper_sys_copyarea,
200 .fb_imageblit = drm_fb_helper_sys_imageblit,
201 .fb_mmap = tegra_fb_mmap,
202 };
203
tegra_fbdev_probe(struct drm_fb_helper * helper,struct drm_fb_helper_surface_size * sizes)204 static int tegra_fbdev_probe(struct drm_fb_helper *helper,
205 struct drm_fb_helper_surface_size *sizes)
206 {
207 struct tegra_fbdev *fbdev = to_tegra_fbdev(helper);
208 struct tegra_drm *tegra = helper->dev->dev_private;
209 struct drm_device *drm = helper->dev;
210 struct drm_mode_fb_cmd2 cmd = { 0 };
211 unsigned int bytes_per_pixel;
212 struct drm_framebuffer *fb;
213 unsigned long offset;
214 struct fb_info *info;
215 struct tegra_bo *bo;
216 size_t size;
217 int err;
218
219 bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
220
221 cmd.width = sizes->surface_width;
222 cmd.height = sizes->surface_height;
223 cmd.pitches[0] = round_up(sizes->surface_width * bytes_per_pixel,
224 tegra->pitch_align);
225
226 cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
227 sizes->surface_depth);
228
229 size = cmd.pitches[0] * cmd.height;
230
231 bo = tegra_bo_create(drm, size, 0);
232 if (IS_ERR(bo))
233 return PTR_ERR(bo);
234
235 info = drm_fb_helper_alloc_fbi(helper);
236 if (IS_ERR(info)) {
237 dev_err(drm->dev, "failed to allocate framebuffer info\n");
238 drm_gem_object_put(&bo->gem);
239 return PTR_ERR(info);
240 }
241
242 fbdev->fb = tegra_fb_alloc(drm, &cmd, &bo, 1);
243 if (IS_ERR(fbdev->fb)) {
244 err = PTR_ERR(fbdev->fb);
245 dev_err(drm->dev, "failed to allocate DRM framebuffer: %d\n",
246 err);
247 drm_gem_object_put(&bo->gem);
248 return PTR_ERR(fbdev->fb);
249 }
250
251 fb = fbdev->fb;
252 helper->fb = fb;
253 helper->fbdev = info;
254
255 info->fbops = &tegra_fb_ops;
256
257 drm_fb_helper_fill_info(info, helper, sizes);
258
259 offset = info->var.xoffset * bytes_per_pixel +
260 info->var.yoffset * fb->pitches[0];
261
262 if (bo->pages) {
263 bo->vaddr = vmap(bo->pages, bo->num_pages, VM_MAP,
264 pgprot_writecombine(PAGE_KERNEL));
265 if (!bo->vaddr) {
266 dev_err(drm->dev, "failed to vmap() framebuffer\n");
267 err = -ENOMEM;
268 goto destroy;
269 }
270 }
271
272 drm->mode_config.fb_base = (resource_size_t)bo->iova;
273 info->screen_base = (void __iomem *)bo->vaddr + offset;
274 info->screen_size = size;
275 info->fix.smem_start = (unsigned long)(bo->iova + offset);
276 info->fix.smem_len = size;
277
278 return 0;
279
280 destroy:
281 drm_framebuffer_remove(fb);
282 return err;
283 }
284
285 static const struct drm_fb_helper_funcs tegra_fb_helper_funcs = {
286 .fb_probe = tegra_fbdev_probe,
287 };
288
tegra_fbdev_create(struct drm_device * drm)289 static struct tegra_fbdev *tegra_fbdev_create(struct drm_device *drm)
290 {
291 struct tegra_fbdev *fbdev;
292
293 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
294 if (!fbdev) {
295 dev_err(drm->dev, "failed to allocate DRM fbdev\n");
296 return ERR_PTR(-ENOMEM);
297 }
298
299 drm_fb_helper_prepare(drm, &fbdev->base, &tegra_fb_helper_funcs);
300
301 return fbdev;
302 }
303
tegra_fbdev_free(struct tegra_fbdev * fbdev)304 static void tegra_fbdev_free(struct tegra_fbdev *fbdev)
305 {
306 kfree(fbdev);
307 }
308
tegra_fbdev_init(struct tegra_fbdev * fbdev,unsigned int preferred_bpp,unsigned int num_crtc,unsigned int max_connectors)309 static int tegra_fbdev_init(struct tegra_fbdev *fbdev,
310 unsigned int preferred_bpp,
311 unsigned int num_crtc,
312 unsigned int max_connectors)
313 {
314 struct drm_device *drm = fbdev->base.dev;
315 int err;
316
317 err = drm_fb_helper_init(drm, &fbdev->base);
318 if (err < 0) {
319 dev_err(drm->dev, "failed to initialize DRM FB helper: %d\n",
320 err);
321 return err;
322 }
323
324 err = drm_fb_helper_initial_config(&fbdev->base, preferred_bpp);
325 if (err < 0) {
326 dev_err(drm->dev, "failed to set initial configuration: %d\n",
327 err);
328 goto fini;
329 }
330
331 return 0;
332
333 fini:
334 drm_fb_helper_fini(&fbdev->base);
335 return err;
336 }
337
tegra_fbdev_exit(struct tegra_fbdev * fbdev)338 static void tegra_fbdev_exit(struct tegra_fbdev *fbdev)
339 {
340 drm_fb_helper_unregister_fbi(&fbdev->base);
341
342 if (fbdev->fb) {
343 struct tegra_bo *bo = tegra_fb_get_plane(fbdev->fb, 0);
344
345 /* Undo the special mapping we made in fbdev probe. */
346 if (bo && bo->pages) {
347 vunmap(bo->vaddr);
348 bo->vaddr = NULL;
349 }
350
351 drm_framebuffer_remove(fbdev->fb);
352 }
353
354 drm_fb_helper_fini(&fbdev->base);
355 tegra_fbdev_free(fbdev);
356 }
357 #endif
358
tegra_drm_fb_prepare(struct drm_device * drm)359 int tegra_drm_fb_prepare(struct drm_device *drm)
360 {
361 #ifdef CONFIG_DRM_FBDEV_EMULATION
362 struct tegra_drm *tegra = drm->dev_private;
363
364 tegra->fbdev = tegra_fbdev_create(drm);
365 if (IS_ERR(tegra->fbdev))
366 return PTR_ERR(tegra->fbdev);
367 #endif
368
369 return 0;
370 }
371
tegra_drm_fb_free(struct drm_device * drm)372 void tegra_drm_fb_free(struct drm_device *drm)
373 {
374 #ifdef CONFIG_DRM_FBDEV_EMULATION
375 struct tegra_drm *tegra = drm->dev_private;
376
377 tegra_fbdev_free(tegra->fbdev);
378 #endif
379 }
380
tegra_drm_fb_init(struct drm_device * drm)381 int tegra_drm_fb_init(struct drm_device *drm)
382 {
383 #ifdef CONFIG_DRM_FBDEV_EMULATION
384 struct tegra_drm *tegra = drm->dev_private;
385 int err;
386
387 err = tegra_fbdev_init(tegra->fbdev, 32, drm->mode_config.num_crtc,
388 drm->mode_config.num_connector);
389 if (err < 0)
390 return err;
391 #endif
392
393 return 0;
394 }
395
tegra_drm_fb_exit(struct drm_device * drm)396 void tegra_drm_fb_exit(struct drm_device *drm)
397 {
398 #ifdef CONFIG_DRM_FBDEV_EMULATION
399 struct tegra_drm *tegra = drm->dev_private;
400
401 tegra_fbdev_exit(tegra->fbdev);
402 #endif
403 }
404