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