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 DMA 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_framebuffer.h>
14 #include <drm/drm_gem_framebuffer_helper.h>
15 #include <drm/drm_modeset_helper.h>
16 
17 #include "drm.h"
18 #include "gem.h"
19 
20 #ifdef CONFIG_DRM_FBDEV_EMULATION
to_tegra_fbdev(struct drm_fb_helper * helper)21 static inline struct tegra_fbdev *to_tegra_fbdev(struct drm_fb_helper *helper)
22 {
23 	return container_of(helper, struct tegra_fbdev, base);
24 }
25 #endif
26 
tegra_fb_get_plane(struct drm_framebuffer * framebuffer,unsigned int index)27 struct tegra_bo *tegra_fb_get_plane(struct drm_framebuffer *framebuffer,
28 				    unsigned int index)
29 {
30 	return to_tegra_bo(drm_gem_fb_get_obj(framebuffer, index));
31 }
32 
tegra_fb_is_bottom_up(struct drm_framebuffer * framebuffer)33 bool tegra_fb_is_bottom_up(struct drm_framebuffer *framebuffer)
34 {
35 	struct tegra_bo *bo = tegra_fb_get_plane(framebuffer, 0);
36 
37 	if (bo->flags & TEGRA_BO_BOTTOM_UP)
38 		return true;
39 
40 	return false;
41 }
42 
tegra_fb_get_tiling(struct drm_framebuffer * framebuffer,struct tegra_bo_tiling * tiling)43 int tegra_fb_get_tiling(struct drm_framebuffer *framebuffer,
44 			struct tegra_bo_tiling *tiling)
45 {
46 	uint64_t modifier = framebuffer->modifier;
47 
48 	if (fourcc_mod_is_vendor(modifier, NVIDIA)) {
49 		if ((modifier & DRM_FORMAT_MOD_NVIDIA_SECTOR_LAYOUT) == 0)
50 			tiling->sector_layout = TEGRA_BO_SECTOR_LAYOUT_TEGRA;
51 		else
52 			tiling->sector_layout = TEGRA_BO_SECTOR_LAYOUT_GPU;
53 
54 		modifier &= ~DRM_FORMAT_MOD_NVIDIA_SECTOR_LAYOUT;
55 	}
56 
57 	switch (modifier) {
58 	case DRM_FORMAT_MOD_LINEAR:
59 		tiling->mode = TEGRA_BO_TILING_MODE_PITCH;
60 		tiling->value = 0;
61 		break;
62 
63 	case DRM_FORMAT_MOD_NVIDIA_TEGRA_TILED:
64 		tiling->mode = TEGRA_BO_TILING_MODE_TILED;
65 		tiling->value = 0;
66 		break;
67 
68 	case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(0):
69 		tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
70 		tiling->value = 0;
71 		break;
72 
73 	case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(1):
74 		tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
75 		tiling->value = 1;
76 		break;
77 
78 	case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(2):
79 		tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
80 		tiling->value = 2;
81 		break;
82 
83 	case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(3):
84 		tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
85 		tiling->value = 3;
86 		break;
87 
88 	case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(4):
89 		tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
90 		tiling->value = 4;
91 		break;
92 
93 	case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(5):
94 		tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
95 		tiling->value = 5;
96 		break;
97 
98 	default:
99 		DRM_DEBUG_KMS("unknown format modifier: %llx\n", modifier);
100 		return -EINVAL;
101 	}
102 
103 	return 0;
104 }
105 
106 static const struct drm_framebuffer_funcs tegra_fb_funcs = {
107 	.destroy = drm_gem_fb_destroy,
108 	.create_handle = drm_gem_fb_create_handle,
109 };
110 
tegra_fb_alloc(struct drm_device * drm,const struct drm_mode_fb_cmd2 * mode_cmd,struct tegra_bo ** planes,unsigned int num_planes)111 static struct drm_framebuffer *tegra_fb_alloc(struct drm_device *drm,
112 					      const struct drm_mode_fb_cmd2 *mode_cmd,
113 					      struct tegra_bo **planes,
114 					      unsigned int num_planes)
115 {
116 	struct drm_framebuffer *fb;
117 	unsigned int i;
118 	int err;
119 
120 	fb = kzalloc(sizeof(*fb), GFP_KERNEL);
121 	if (!fb)
122 		return ERR_PTR(-ENOMEM);
123 
124 	drm_helper_mode_fill_fb_struct(drm, fb, mode_cmd);
125 
126 	for (i = 0; i < fb->format->num_planes; i++)
127 		fb->obj[i] = &planes[i]->gem;
128 
129 	err = drm_framebuffer_init(drm, fb, &tegra_fb_funcs);
130 	if (err < 0) {
131 		dev_err(drm->dev, "failed to initialize framebuffer: %d\n",
132 			err);
133 		kfree(fb);
134 		return ERR_PTR(err);
135 	}
136 
137 	return fb;
138 }
139 
tegra_fb_create(struct drm_device * drm,struct drm_file * file,const struct drm_mode_fb_cmd2 * cmd)140 struct drm_framebuffer *tegra_fb_create(struct drm_device *drm,
141 					struct drm_file *file,
142 					const struct drm_mode_fb_cmd2 *cmd)
143 {
144 	const struct drm_format_info *info = drm_get_format_info(drm, cmd);
145 	struct tegra_bo *planes[4];
146 	struct drm_gem_object *gem;
147 	struct drm_framebuffer *fb;
148 	unsigned int i;
149 	int err;
150 
151 	for (i = 0; i < info->num_planes; i++) {
152 		unsigned int width = cmd->width / (i ? info->hsub : 1);
153 		unsigned int height = cmd->height / (i ? info->vsub : 1);
154 		unsigned int size, bpp;
155 
156 		gem = drm_gem_object_lookup(file, cmd->handles[i]);
157 		if (!gem) {
158 			err = -ENXIO;
159 			goto unreference;
160 		}
161 
162 		bpp = info->cpp[i];
163 
164 		size = (height - 1) * cmd->pitches[i] +
165 		       width * bpp + cmd->offsets[i];
166 
167 		if (gem->size < size) {
168 			err = -EINVAL;
169 			goto unreference;
170 		}
171 
172 		planes[i] = to_tegra_bo(gem);
173 	}
174 
175 	fb = tegra_fb_alloc(drm, cmd, planes, i);
176 	if (IS_ERR(fb)) {
177 		err = PTR_ERR(fb);
178 		goto unreference;
179 	}
180 
181 	return fb;
182 
183 unreference:
184 	while (i--)
185 		drm_gem_object_put(&planes[i]->gem);
186 
187 	return ERR_PTR(err);
188 }
189 
190 #ifdef CONFIG_DRM_FBDEV_EMULATION
tegra_fb_mmap(struct fb_info * info,struct vm_area_struct * vma)191 static int tegra_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
192 {
193 	struct drm_fb_helper *helper = info->par;
194 	struct tegra_bo *bo;
195 	int err;
196 
197 	bo = tegra_fb_get_plane(helper->fb, 0);
198 
199 	err = drm_gem_mmap_obj(&bo->gem, bo->gem.size, vma);
200 	if (err < 0)
201 		return err;
202 
203 	return __tegra_gem_mmap(&bo->gem, vma);
204 }
205 
206 static const struct fb_ops tegra_fb_ops = {
207 	.owner = THIS_MODULE,
208 	DRM_FB_HELPER_DEFAULT_OPS,
209 	.fb_read = drm_fb_helper_sys_read,
210 	.fb_write = drm_fb_helper_sys_write,
211 	.fb_fillrect = drm_fb_helper_sys_fillrect,
212 	.fb_copyarea = drm_fb_helper_sys_copyarea,
213 	.fb_imageblit = drm_fb_helper_sys_imageblit,
214 	.fb_mmap = tegra_fb_mmap,
215 };
216 
tegra_fbdev_probe(struct drm_fb_helper * helper,struct drm_fb_helper_surface_size * sizes)217 static int tegra_fbdev_probe(struct drm_fb_helper *helper,
218 			     struct drm_fb_helper_surface_size *sizes)
219 {
220 	struct tegra_fbdev *fbdev = to_tegra_fbdev(helper);
221 	struct tegra_drm *tegra = helper->dev->dev_private;
222 	struct drm_device *drm = helper->dev;
223 	struct drm_mode_fb_cmd2 cmd = { 0 };
224 	unsigned int bytes_per_pixel;
225 	struct drm_framebuffer *fb;
226 	unsigned long offset;
227 	struct fb_info *info;
228 	struct tegra_bo *bo;
229 	size_t size;
230 	int err;
231 
232 	bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
233 
234 	cmd.width = sizes->surface_width;
235 	cmd.height = sizes->surface_height;
236 	cmd.pitches[0] = round_up(sizes->surface_width * bytes_per_pixel,
237 				  tegra->pitch_align);
238 
239 	cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
240 						     sizes->surface_depth);
241 
242 	size = cmd.pitches[0] * cmd.height;
243 
244 	bo = tegra_bo_create(drm, size, 0);
245 	if (IS_ERR(bo))
246 		return PTR_ERR(bo);
247 
248 	info = drm_fb_helper_alloc_info(helper);
249 	if (IS_ERR(info)) {
250 		dev_err(drm->dev, "failed to allocate framebuffer info\n");
251 		drm_gem_object_put(&bo->gem);
252 		return PTR_ERR(info);
253 	}
254 
255 	fbdev->fb = tegra_fb_alloc(drm, &cmd, &bo, 1);
256 	if (IS_ERR(fbdev->fb)) {
257 		err = PTR_ERR(fbdev->fb);
258 		dev_err(drm->dev, "failed to allocate DRM framebuffer: %d\n",
259 			err);
260 		drm_gem_object_put(&bo->gem);
261 		return PTR_ERR(fbdev->fb);
262 	}
263 
264 	fb = fbdev->fb;
265 	helper->fb = fb;
266 	helper->info = info;
267 
268 	info->fbops = &tegra_fb_ops;
269 
270 	drm_fb_helper_fill_info(info, helper, sizes);
271 
272 	offset = info->var.xoffset * bytes_per_pixel +
273 		 info->var.yoffset * fb->pitches[0];
274 
275 	if (bo->pages) {
276 		bo->vaddr = vmap(bo->pages, bo->num_pages, VM_MAP,
277 				 pgprot_writecombine(PAGE_KERNEL));
278 		if (!bo->vaddr) {
279 			dev_err(drm->dev, "failed to vmap() framebuffer\n");
280 			err = -ENOMEM;
281 			goto destroy;
282 		}
283 	}
284 
285 	info->screen_base = (void __iomem *)bo->vaddr + offset;
286 	info->screen_size = size;
287 	info->fix.smem_start = (unsigned long)(bo->iova + offset);
288 	info->fix.smem_len = size;
289 
290 	return 0;
291 
292 destroy:
293 	drm_framebuffer_remove(fb);
294 	return err;
295 }
296 
297 static const struct drm_fb_helper_funcs tegra_fb_helper_funcs = {
298 	.fb_probe = tegra_fbdev_probe,
299 };
300 
tegra_fbdev_create(struct drm_device * drm)301 static struct tegra_fbdev *tegra_fbdev_create(struct drm_device *drm)
302 {
303 	struct tegra_fbdev *fbdev;
304 
305 	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
306 	if (!fbdev) {
307 		dev_err(drm->dev, "failed to allocate DRM fbdev\n");
308 		return ERR_PTR(-ENOMEM);
309 	}
310 
311 	drm_fb_helper_prepare(drm, &fbdev->base, 32, &tegra_fb_helper_funcs);
312 
313 	return fbdev;
314 }
315 
tegra_fbdev_free(struct tegra_fbdev * fbdev)316 static void tegra_fbdev_free(struct tegra_fbdev *fbdev)
317 {
318 	drm_fb_helper_unprepare(&fbdev->base);
319 	kfree(fbdev);
320 }
321 
tegra_fbdev_init(struct tegra_fbdev * fbdev,unsigned int num_crtc,unsigned int max_connectors)322 static int tegra_fbdev_init(struct tegra_fbdev *fbdev,
323 			    unsigned int num_crtc,
324 			    unsigned int max_connectors)
325 {
326 	struct drm_device *drm = fbdev->base.dev;
327 	int err;
328 
329 	err = drm_fb_helper_init(drm, &fbdev->base);
330 	if (err < 0) {
331 		dev_err(drm->dev, "failed to initialize DRM FB helper: %d\n",
332 			err);
333 		return err;
334 	}
335 
336 	err = drm_fb_helper_initial_config(&fbdev->base);
337 	if (err < 0) {
338 		dev_err(drm->dev, "failed to set initial configuration: %d\n",
339 			err);
340 		goto fini;
341 	}
342 
343 	return 0;
344 
345 fini:
346 	drm_fb_helper_fini(&fbdev->base);
347 	return err;
348 }
349 
tegra_fbdev_exit(struct tegra_fbdev * fbdev)350 static void tegra_fbdev_exit(struct tegra_fbdev *fbdev)
351 {
352 	drm_fb_helper_unregister_info(&fbdev->base);
353 
354 	if (fbdev->fb) {
355 		struct tegra_bo *bo = tegra_fb_get_plane(fbdev->fb, 0);
356 
357 		/* Undo the special mapping we made in fbdev probe. */
358 		if (bo && bo->pages) {
359 			vunmap(bo->vaddr);
360 			bo->vaddr = NULL;
361 		}
362 
363 		drm_framebuffer_remove(fbdev->fb);
364 	}
365 
366 	drm_fb_helper_fini(&fbdev->base);
367 	tegra_fbdev_free(fbdev);
368 }
369 #endif
370 
tegra_drm_fb_prepare(struct drm_device * drm)371 int tegra_drm_fb_prepare(struct drm_device *drm)
372 {
373 #ifdef CONFIG_DRM_FBDEV_EMULATION
374 	struct tegra_drm *tegra = drm->dev_private;
375 
376 	tegra->fbdev = tegra_fbdev_create(drm);
377 	if (IS_ERR(tegra->fbdev))
378 		return PTR_ERR(tegra->fbdev);
379 #endif
380 
381 	return 0;
382 }
383 
tegra_drm_fb_free(struct drm_device * drm)384 void tegra_drm_fb_free(struct drm_device *drm)
385 {
386 #ifdef CONFIG_DRM_FBDEV_EMULATION
387 	struct tegra_drm *tegra = drm->dev_private;
388 
389 	tegra_fbdev_free(tegra->fbdev);
390 #endif
391 }
392 
tegra_drm_fb_init(struct drm_device * drm)393 int tegra_drm_fb_init(struct drm_device *drm)
394 {
395 #ifdef CONFIG_DRM_FBDEV_EMULATION
396 	struct tegra_drm *tegra = drm->dev_private;
397 	int err;
398 
399 	err = tegra_fbdev_init(tegra->fbdev, drm->mode_config.num_crtc,
400 			       drm->mode_config.num_connector);
401 	if (err < 0)
402 		return err;
403 #endif
404 
405 	return 0;
406 }
407 
tegra_drm_fb_exit(struct drm_device * drm)408 void tegra_drm_fb_exit(struct drm_device *drm)
409 {
410 #ifdef CONFIG_DRM_FBDEV_EMULATION
411 	struct tegra_drm *tegra = drm->dev_private;
412 
413 	tegra_fbdev_exit(tegra->fbdev);
414 #endif
415 }
416