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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 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
21static 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
27struct 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
33bool 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
43int 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
106static const struct drm_framebuffer_funcs tegra_fb_funcs = {
107 .destroy = drm_gem_fb_destroy,
108 .create_handle = drm_gem_fb_create_handle,
109};
110
111static 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
140struct 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
183unreference:
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
191static 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
206static 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
217static 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
292destroy:
293 drm_framebuffer_remove(fb);
294 return err;
295}
296
297static const struct drm_fb_helper_funcs tegra_fb_helper_funcs = {
298 .fb_probe = tegra_fbdev_probe,
299};
300
301static 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, &tegra_fb_helper_funcs);
312
313 return fbdev;
314}
315
316static void tegra_fbdev_free(struct tegra_fbdev *fbdev)
317{
318 kfree(fbdev);
319}
320
321static int tegra_fbdev_init(struct tegra_fbdev *fbdev,
322 unsigned int preferred_bpp,
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, preferred_bpp);
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
345fini:
346 drm_fb_helper_fini(&fbdev->base);
347 return err;
348}
349
350static 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
371int 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
384void 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
393int 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, 32, 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
408void 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}