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 Device Inc. 8 */ 9 10 #include <linux/console.h> 11 12 #include "drm.h" 13 #include "gem.h" 14 #include <drm/drm_gem_framebuffer_helper.h> 15 #include <drm/drm_modeset_helper.h> 16 17 #ifdef CONFIG_DRM_FBDEV_EMULATION 18 static inline struct tegra_fbdev *to_tegra_fbdev(struct drm_fb_helper *helper) 19 { 20 return container_of(helper, struct tegra_fbdev, base); 21 } 22 #endif 23 24 struct tegra_bo *tegra_fb_get_plane(struct drm_framebuffer *framebuffer, 25 unsigned int index) 26 { 27 return to_tegra_bo(drm_gem_fb_get_obj(framebuffer, index)); 28 } 29 30 bool tegra_fb_is_bottom_up(struct drm_framebuffer *framebuffer) 31 { 32 struct tegra_bo *bo = tegra_fb_get_plane(framebuffer, 0); 33 34 if (bo->flags & TEGRA_BO_BOTTOM_UP) 35 return true; 36 37 return false; 38 } 39 40 int tegra_fb_get_tiling(struct drm_framebuffer *framebuffer, 41 struct tegra_bo_tiling *tiling) 42 { 43 uint64_t modifier = framebuffer->modifier; 44 45 switch (modifier) { 46 case DRM_FORMAT_MOD_LINEAR: 47 tiling->mode = TEGRA_BO_TILING_MODE_PITCH; 48 tiling->value = 0; 49 break; 50 51 case DRM_FORMAT_MOD_NVIDIA_TEGRA_TILED: 52 tiling->mode = TEGRA_BO_TILING_MODE_TILED; 53 tiling->value = 0; 54 break; 55 56 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(0): 57 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK; 58 tiling->value = 0; 59 break; 60 61 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(1): 62 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK; 63 tiling->value = 1; 64 break; 65 66 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(2): 67 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK; 68 tiling->value = 2; 69 break; 70 71 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(3): 72 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK; 73 tiling->value = 3; 74 break; 75 76 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(4): 77 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK; 78 tiling->value = 4; 79 break; 80 81 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(5): 82 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK; 83 tiling->value = 5; 84 break; 85 86 default: 87 return -EINVAL; 88 } 89 90 return 0; 91 } 92 93 static const struct drm_framebuffer_funcs tegra_fb_funcs = { 94 .destroy = drm_gem_fb_destroy, 95 .create_handle = drm_gem_fb_create_handle, 96 }; 97 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) 102 { 103 struct drm_framebuffer *fb; 104 unsigned int i; 105 int err; 106 107 fb = kzalloc(sizeof(*fb), GFP_KERNEL); 108 if (!fb) 109 return ERR_PTR(-ENOMEM); 110 111 drm_helper_mode_fill_fb_struct(drm, fb, mode_cmd); 112 113 for (i = 0; i < fb->format->num_planes; i++) 114 fb->obj[i] = &planes[i]->gem; 115 116 err = drm_framebuffer_init(drm, fb, &tegra_fb_funcs); 117 if (err < 0) { 118 dev_err(drm->dev, "failed to initialize framebuffer: %d\n", 119 err); 120 kfree(fb); 121 return ERR_PTR(err); 122 } 123 124 return fb; 125 } 126 127 struct drm_framebuffer *tegra_fb_create(struct drm_device *drm, 128 struct drm_file *file, 129 const struct drm_mode_fb_cmd2 *cmd) 130 { 131 const struct drm_format_info *info = drm_get_format_info(drm, cmd); 132 struct tegra_bo *planes[4]; 133 struct drm_gem_object *gem; 134 struct drm_framebuffer *fb; 135 unsigned int i; 136 int err; 137 138 for (i = 0; i < info->num_planes; i++) { 139 unsigned int width = cmd->width / (i ? info->hsub : 1); 140 unsigned int height = cmd->height / (i ? info->vsub : 1); 141 unsigned int size, bpp; 142 143 gem = drm_gem_object_lookup(file, cmd->handles[i]); 144 if (!gem) { 145 err = -ENXIO; 146 goto unreference; 147 } 148 149 bpp = info->cpp[i]; 150 151 size = (height - 1) * cmd->pitches[i] + 152 width * bpp + cmd->offsets[i]; 153 154 if (gem->size < size) { 155 err = -EINVAL; 156 goto unreference; 157 } 158 159 planes[i] = to_tegra_bo(gem); 160 } 161 162 fb = tegra_fb_alloc(drm, cmd, planes, i); 163 if (IS_ERR(fb)) { 164 err = PTR_ERR(fb); 165 goto unreference; 166 } 167 168 return fb; 169 170 unreference: 171 while (i--) 172 drm_gem_object_put_unlocked(&planes[i]->gem); 173 174 return ERR_PTR(err); 175 } 176 177 #ifdef CONFIG_DRM_FBDEV_EMULATION 178 static int tegra_fb_mmap(struct fb_info *info, struct vm_area_struct *vma) 179 { 180 struct drm_fb_helper *helper = info->par; 181 struct tegra_bo *bo; 182 int err; 183 184 bo = tegra_fb_get_plane(helper->fb, 0); 185 186 err = drm_gem_mmap_obj(&bo->gem, bo->gem.size, vma); 187 if (err < 0) 188 return err; 189 190 return __tegra_gem_mmap(&bo->gem, vma); 191 } 192 193 static struct fb_ops tegra_fb_ops = { 194 .owner = THIS_MODULE, 195 DRM_FB_HELPER_DEFAULT_OPS, 196 .fb_fillrect = drm_fb_helper_sys_fillrect, 197 .fb_copyarea = drm_fb_helper_sys_copyarea, 198 .fb_imageblit = drm_fb_helper_sys_imageblit, 199 .fb_mmap = tegra_fb_mmap, 200 }; 201 202 static int tegra_fbdev_probe(struct drm_fb_helper *helper, 203 struct drm_fb_helper_surface_size *sizes) 204 { 205 struct tegra_fbdev *fbdev = to_tegra_fbdev(helper); 206 struct tegra_drm *tegra = helper->dev->dev_private; 207 struct drm_device *drm = helper->dev; 208 struct drm_mode_fb_cmd2 cmd = { 0 }; 209 unsigned int bytes_per_pixel; 210 struct drm_framebuffer *fb; 211 unsigned long offset; 212 struct fb_info *info; 213 struct tegra_bo *bo; 214 size_t size; 215 int err; 216 217 bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8); 218 219 cmd.width = sizes->surface_width; 220 cmd.height = sizes->surface_height; 221 cmd.pitches[0] = round_up(sizes->surface_width * bytes_per_pixel, 222 tegra->pitch_align); 223 224 cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 225 sizes->surface_depth); 226 227 size = cmd.pitches[0] * cmd.height; 228 229 bo = tegra_bo_create(drm, size, 0); 230 if (IS_ERR(bo)) 231 return PTR_ERR(bo); 232 233 info = drm_fb_helper_alloc_fbi(helper); 234 if (IS_ERR(info)) { 235 dev_err(drm->dev, "failed to allocate framebuffer info\n"); 236 drm_gem_object_put_unlocked(&bo->gem); 237 return PTR_ERR(info); 238 } 239 240 fbdev->fb = tegra_fb_alloc(drm, &cmd, &bo, 1); 241 if (IS_ERR(fbdev->fb)) { 242 err = PTR_ERR(fbdev->fb); 243 dev_err(drm->dev, "failed to allocate DRM framebuffer: %d\n", 244 err); 245 drm_gem_object_put_unlocked(&bo->gem); 246 return PTR_ERR(fbdev->fb); 247 } 248 249 fb = fbdev->fb; 250 helper->fb = fb; 251 helper->fbdev = info; 252 253 info->fbops = &tegra_fb_ops; 254 255 drm_fb_helper_fill_info(info, helper, sizes); 256 257 offset = info->var.xoffset * bytes_per_pixel + 258 info->var.yoffset * fb->pitches[0]; 259 260 if (bo->pages) { 261 bo->vaddr = vmap(bo->pages, bo->num_pages, VM_MAP, 262 pgprot_writecombine(PAGE_KERNEL)); 263 if (!bo->vaddr) { 264 dev_err(drm->dev, "failed to vmap() framebuffer\n"); 265 err = -ENOMEM; 266 goto destroy; 267 } 268 } 269 270 drm->mode_config.fb_base = (resource_size_t)bo->paddr; 271 info->screen_base = (void __iomem *)bo->vaddr + offset; 272 info->screen_size = size; 273 info->fix.smem_start = (unsigned long)(bo->paddr + offset); 274 info->fix.smem_len = size; 275 276 return 0; 277 278 destroy: 279 drm_framebuffer_remove(fb); 280 return err; 281 } 282 283 static const struct drm_fb_helper_funcs tegra_fb_helper_funcs = { 284 .fb_probe = tegra_fbdev_probe, 285 }; 286 287 static struct tegra_fbdev *tegra_fbdev_create(struct drm_device *drm) 288 { 289 struct tegra_fbdev *fbdev; 290 291 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 292 if (!fbdev) { 293 dev_err(drm->dev, "failed to allocate DRM fbdev\n"); 294 return ERR_PTR(-ENOMEM); 295 } 296 297 drm_fb_helper_prepare(drm, &fbdev->base, &tegra_fb_helper_funcs); 298 299 return fbdev; 300 } 301 302 static void tegra_fbdev_free(struct tegra_fbdev *fbdev) 303 { 304 kfree(fbdev); 305 } 306 307 static int tegra_fbdev_init(struct tegra_fbdev *fbdev, 308 unsigned int preferred_bpp, 309 unsigned int num_crtc, 310 unsigned int max_connectors) 311 { 312 struct drm_device *drm = fbdev->base.dev; 313 int err; 314 315 err = drm_fb_helper_init(drm, &fbdev->base, max_connectors); 316 if (err < 0) { 317 dev_err(drm->dev, "failed to initialize DRM FB helper: %d\n", 318 err); 319 return err; 320 } 321 322 err = drm_fb_helper_single_add_all_connectors(&fbdev->base); 323 if (err < 0) { 324 dev_err(drm->dev, "failed to add connectors: %d\n", err); 325 goto fini; 326 } 327 328 err = drm_fb_helper_initial_config(&fbdev->base, preferred_bpp); 329 if (err < 0) { 330 dev_err(drm->dev, "failed to set initial configuration: %d\n", 331 err); 332 goto fini; 333 } 334 335 return 0; 336 337 fini: 338 drm_fb_helper_fini(&fbdev->base); 339 return err; 340 } 341 342 static void tegra_fbdev_exit(struct tegra_fbdev *fbdev) 343 { 344 drm_fb_helper_unregister_fbi(&fbdev->base); 345 346 if (fbdev->fb) { 347 struct tegra_bo *bo = tegra_fb_get_plane(fbdev->fb, 0); 348 349 /* Undo the special mapping we made in fbdev probe. */ 350 if (bo && bo->pages) { 351 vunmap(bo->vaddr); 352 bo->vaddr = NULL; 353 } 354 355 drm_framebuffer_remove(fbdev->fb); 356 } 357 358 drm_fb_helper_fini(&fbdev->base); 359 tegra_fbdev_free(fbdev); 360 } 361 #endif 362 363 int tegra_drm_fb_prepare(struct drm_device *drm) 364 { 365 #ifdef CONFIG_DRM_FBDEV_EMULATION 366 struct tegra_drm *tegra = drm->dev_private; 367 368 tegra->fbdev = tegra_fbdev_create(drm); 369 if (IS_ERR(tegra->fbdev)) 370 return PTR_ERR(tegra->fbdev); 371 #endif 372 373 return 0; 374 } 375 376 void tegra_drm_fb_free(struct drm_device *drm) 377 { 378 #ifdef CONFIG_DRM_FBDEV_EMULATION 379 struct tegra_drm *tegra = drm->dev_private; 380 381 tegra_fbdev_free(tegra->fbdev); 382 #endif 383 } 384 385 int tegra_drm_fb_init(struct drm_device *drm) 386 { 387 #ifdef CONFIG_DRM_FBDEV_EMULATION 388 struct tegra_drm *tegra = drm->dev_private; 389 int err; 390 391 err = tegra_fbdev_init(tegra->fbdev, 32, drm->mode_config.num_crtc, 392 drm->mode_config.num_connector); 393 if (err < 0) 394 return err; 395 #endif 396 397 return 0; 398 } 399 400 void tegra_drm_fb_exit(struct drm_device *drm) 401 { 402 #ifdef CONFIG_DRM_FBDEV_EMULATION 403 struct tegra_drm *tegra = drm->dev_private; 404 405 tegra_fbdev_exit(tegra->fbdev); 406 #endif 407 } 408