1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2012-2013 Avionic Design GmbH
4 * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
6 * Based on the KMS/FB CMA helpers
7 * Copyright (C) 2012 Analog Device Inc.
10 #include <linux/console.h>
14 #include <drm/drm_gem_framebuffer_helper.h>
15 #include <drm/drm_modeset_helper.h>
17 #ifdef CONFIG_DRM_FBDEV_EMULATION
18 static inline struct tegra_fbdev *to_tegra_fbdev(struct drm_fb_helper *helper)
20 return container_of(helper, struct tegra_fbdev, base);
24 struct tegra_bo *tegra_fb_get_plane(struct drm_framebuffer *framebuffer,
27 return to_tegra_bo(drm_gem_fb_get_obj(framebuffer, index));
30 bool tegra_fb_is_bottom_up(struct drm_framebuffer *framebuffer)
32 struct tegra_bo *bo = tegra_fb_get_plane(framebuffer, 0);
34 if (bo->flags & TEGRA_BO_BOTTOM_UP)
40 int tegra_fb_get_tiling(struct drm_framebuffer *framebuffer,
41 struct tegra_bo_tiling *tiling)
43 uint64_t modifier = framebuffer->modifier;
46 case DRM_FORMAT_MOD_LINEAR:
47 tiling->mode = TEGRA_BO_TILING_MODE_PITCH;
51 case DRM_FORMAT_MOD_NVIDIA_TEGRA_TILED:
52 tiling->mode = TEGRA_BO_TILING_MODE_TILED;
56 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(0):
57 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
61 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(1):
62 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
66 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(2):
67 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
71 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(3):
72 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
76 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(4):
77 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
81 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(5):
82 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK;
93 static const struct drm_framebuffer_funcs tegra_fb_funcs = {
94 .destroy = drm_gem_fb_destroy,
95 .create_handle = drm_gem_fb_create_handle,
98 static struct drm_framebuffer *tegra_fb_alloc(struct drm_device *drm,
99 const struct drm_mode_fb_cmd2 *mode_cmd,
100 struct tegra_bo **planes,
101 unsigned int num_planes)
103 struct drm_framebuffer *fb;
107 fb = kzalloc(sizeof(*fb), GFP_KERNEL);
109 return ERR_PTR(-ENOMEM);
111 drm_helper_mode_fill_fb_struct(drm, fb, mode_cmd);
113 for (i = 0; i < fb->format->num_planes; i++)
114 fb->obj[i] = &planes[i]->gem;
116 err = drm_framebuffer_init(drm, fb, &tegra_fb_funcs);
118 dev_err(drm->dev, "failed to initialize framebuffer: %d\n",
127 struct drm_framebuffer *tegra_fb_create(struct drm_device *drm,
128 struct drm_file *file,
129 const struct drm_mode_fb_cmd2 *cmd)
131 unsigned int hsub, vsub, i;
132 struct tegra_bo *planes[4];
133 struct drm_gem_object *gem;
134 struct drm_framebuffer *fb;
137 hsub = drm_format_horz_chroma_subsampling(cmd->pixel_format);
138 vsub = drm_format_vert_chroma_subsampling(cmd->pixel_format);
140 for (i = 0; i < drm_format_num_planes(cmd->pixel_format); i++) {
141 unsigned int width = cmd->width / (i ? hsub : 1);
142 unsigned int height = cmd->height / (i ? vsub : 1);
143 unsigned int size, bpp;
145 gem = drm_gem_object_lookup(file, cmd->handles[i]);
151 bpp = drm_format_plane_cpp(cmd->pixel_format, i);
153 size = (height - 1) * cmd->pitches[i] +
154 width * bpp + cmd->offsets[i];
156 if (gem->size < size) {
161 planes[i] = to_tegra_bo(gem);
164 fb = tegra_fb_alloc(drm, cmd, planes, i);
174 drm_gem_object_put_unlocked(&planes[i]->gem);
179 #ifdef CONFIG_DRM_FBDEV_EMULATION
180 static int tegra_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
182 struct drm_fb_helper *helper = info->par;
186 bo = tegra_fb_get_plane(helper->fb, 0);
188 err = drm_gem_mmap_obj(&bo->gem, bo->gem.size, vma);
192 return __tegra_gem_mmap(&bo->gem, vma);
195 static 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,
204 static int tegra_fbdev_probe(struct drm_fb_helper *helper,
205 struct drm_fb_helper_surface_size *sizes)
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;
219 bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
221 cmd.width = sizes->surface_width;
222 cmd.height = sizes->surface_height;
223 cmd.pitches[0] = round_up(sizes->surface_width * bytes_per_pixel,
226 cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
227 sizes->surface_depth);
229 size = cmd.pitches[0] * cmd.height;
231 bo = tegra_bo_create(drm, size, 0);
235 info = drm_fb_helper_alloc_fbi(helper);
237 dev_err(drm->dev, "failed to allocate framebuffer info\n");
238 drm_gem_object_put_unlocked(&bo->gem);
239 return PTR_ERR(info);
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",
247 drm_gem_object_put_unlocked(&bo->gem);
248 return PTR_ERR(fbdev->fb);
253 helper->fbdev = info;
255 info->fbops = &tegra_fb_ops;
257 drm_fb_helper_fill_info(info, helper, sizes);
259 offset = info->var.xoffset * bytes_per_pixel +
260 info->var.yoffset * fb->pitches[0];
263 bo->vaddr = vmap(bo->pages, bo->num_pages, VM_MAP,
264 pgprot_writecombine(PAGE_KERNEL));
266 dev_err(drm->dev, "failed to vmap() framebuffer\n");
272 drm->mode_config.fb_base = (resource_size_t)bo->paddr;
273 info->screen_base = (void __iomem *)bo->vaddr + offset;
274 info->screen_size = size;
275 info->fix.smem_start = (unsigned long)(bo->paddr + offset);
276 info->fix.smem_len = size;
281 drm_framebuffer_remove(fb);
285 static const struct drm_fb_helper_funcs tegra_fb_helper_funcs = {
286 .fb_probe = tegra_fbdev_probe,
289 static struct tegra_fbdev *tegra_fbdev_create(struct drm_device *drm)
291 struct tegra_fbdev *fbdev;
293 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
295 dev_err(drm->dev, "failed to allocate DRM fbdev\n");
296 return ERR_PTR(-ENOMEM);
299 drm_fb_helper_prepare(drm, &fbdev->base, &tegra_fb_helper_funcs);
304 static void tegra_fbdev_free(struct tegra_fbdev *fbdev)
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)
314 struct drm_device *drm = fbdev->base.dev;
317 err = drm_fb_helper_init(drm, &fbdev->base, max_connectors);
319 dev_err(drm->dev, "failed to initialize DRM FB helper: %d\n",
324 err = drm_fb_helper_single_add_all_connectors(&fbdev->base);
326 dev_err(drm->dev, "failed to add connectors: %d\n", err);
330 err = drm_fb_helper_initial_config(&fbdev->base, preferred_bpp);
332 dev_err(drm->dev, "failed to set initial configuration: %d\n",
340 drm_fb_helper_fini(&fbdev->base);
344 static void tegra_fbdev_exit(struct tegra_fbdev *fbdev)
346 drm_fb_helper_unregister_fbi(&fbdev->base);
349 struct tegra_bo *bo = tegra_fb_get_plane(fbdev->fb, 0);
351 /* Undo the special mapping we made in fbdev probe. */
352 if (bo && bo->pages) {
357 drm_framebuffer_remove(fbdev->fb);
360 drm_fb_helper_fini(&fbdev->base);
361 tegra_fbdev_free(fbdev);
365 int tegra_drm_fb_prepare(struct drm_device *drm)
367 #ifdef CONFIG_DRM_FBDEV_EMULATION
368 struct tegra_drm *tegra = drm->dev_private;
370 tegra->fbdev = tegra_fbdev_create(drm);
371 if (IS_ERR(tegra->fbdev))
372 return PTR_ERR(tegra->fbdev);
378 void tegra_drm_fb_free(struct drm_device *drm)
380 #ifdef CONFIG_DRM_FBDEV_EMULATION
381 struct tegra_drm *tegra = drm->dev_private;
383 tegra_fbdev_free(tegra->fbdev);
387 int tegra_drm_fb_init(struct drm_device *drm)
389 #ifdef CONFIG_DRM_FBDEV_EMULATION
390 struct tegra_drm *tegra = drm->dev_private;
393 err = tegra_fbdev_init(tegra->fbdev, 32, drm->mode_config.num_crtc,
394 drm->mode_config.num_connector);
402 void tegra_drm_fb_exit(struct drm_device *drm)
404 #ifdef CONFIG_DRM_FBDEV_EMULATION
405 struct tegra_drm *tegra = drm->dev_private;
407 tegra_fbdev_exit(tegra->fbdev);