1 /* 2 * Copyright (C) 2012-2013 Avionic Design GmbH 3 * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved. 4 * 5 * Based on the KMS/FB CMA helpers 6 * Copyright (C) 2012 Analog Device Inc. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #include <linux/console.h> 14 15 #include "drm.h" 16 #include "gem.h" 17 #include <drm/drm_gem_framebuffer_helper.h> 18 19 #ifdef CONFIG_DRM_FBDEV_EMULATION 20 static 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 26 struct 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 32 bool 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 42 int tegra_fb_get_tiling(struct drm_framebuffer *framebuffer, 43 struct tegra_bo_tiling *tiling) 44 { 45 uint64_t modifier = framebuffer->modifier; 46 47 switch (modifier) { 48 case DRM_FORMAT_MOD_LINEAR: 49 tiling->mode = TEGRA_BO_TILING_MODE_PITCH; 50 tiling->value = 0; 51 break; 52 53 case DRM_FORMAT_MOD_NVIDIA_TEGRA_TILED: 54 tiling->mode = TEGRA_BO_TILING_MODE_TILED; 55 tiling->value = 0; 56 break; 57 58 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(0): 59 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK; 60 tiling->value = 0; 61 break; 62 63 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(1): 64 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK; 65 tiling->value = 1; 66 break; 67 68 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(2): 69 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK; 70 tiling->value = 2; 71 break; 72 73 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(3): 74 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK; 75 tiling->value = 3; 76 break; 77 78 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(4): 79 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK; 80 tiling->value = 4; 81 break; 82 83 case DRM_FORMAT_MOD_NVIDIA_16BX2_BLOCK(5): 84 tiling->mode = TEGRA_BO_TILING_MODE_BLOCK; 85 tiling->value = 5; 86 break; 87 88 default: 89 return -EINVAL; 90 } 91 92 return 0; 93 } 94 95 static const struct drm_framebuffer_funcs tegra_fb_funcs = { 96 .destroy = drm_gem_fb_destroy, 97 .create_handle = drm_gem_fb_create_handle, 98 }; 99 100 static struct drm_framebuffer *tegra_fb_alloc(struct drm_device *drm, 101 const struct drm_mode_fb_cmd2 *mode_cmd, 102 struct tegra_bo **planes, 103 unsigned int num_planes) 104 { 105 struct drm_framebuffer *fb; 106 unsigned int i; 107 int err; 108 109 fb = kzalloc(sizeof(*fb), GFP_KERNEL); 110 if (!fb) 111 return ERR_PTR(-ENOMEM); 112 113 drm_helper_mode_fill_fb_struct(drm, fb, mode_cmd); 114 115 for (i = 0; i < fb->format->num_planes; i++) 116 fb->obj[i] = &planes[i]->gem; 117 118 err = drm_framebuffer_init(drm, fb, &tegra_fb_funcs); 119 if (err < 0) { 120 dev_err(drm->dev, "failed to initialize framebuffer: %d\n", 121 err); 122 kfree(fb); 123 return ERR_PTR(err); 124 } 125 126 return fb; 127 } 128 129 struct drm_framebuffer *tegra_fb_create(struct drm_device *drm, 130 struct drm_file *file, 131 const struct drm_mode_fb_cmd2 *cmd) 132 { 133 unsigned int hsub, vsub, i; 134 struct tegra_bo *planes[4]; 135 struct drm_gem_object *gem; 136 struct drm_framebuffer *fb; 137 int err; 138 139 hsub = drm_format_horz_chroma_subsampling(cmd->pixel_format); 140 vsub = drm_format_vert_chroma_subsampling(cmd->pixel_format); 141 142 for (i = 0; i < drm_format_num_planes(cmd->pixel_format); i++) { 143 unsigned int width = cmd->width / (i ? hsub : 1); 144 unsigned int height = cmd->height / (i ? vsub : 1); 145 unsigned int size, bpp; 146 147 gem = drm_gem_object_lookup(file, cmd->handles[i]); 148 if (!gem) { 149 err = -ENXIO; 150 goto unreference; 151 } 152 153 bpp = drm_format_plane_cpp(cmd->pixel_format, i); 154 155 size = (height - 1) * cmd->pitches[i] + 156 width * bpp + cmd->offsets[i]; 157 158 if (gem->size < size) { 159 err = -EINVAL; 160 goto unreference; 161 } 162 163 planes[i] = to_tegra_bo(gem); 164 } 165 166 fb = tegra_fb_alloc(drm, cmd, planes, i); 167 if (IS_ERR(fb)) { 168 err = PTR_ERR(fb); 169 goto unreference; 170 } 171 172 return fb; 173 174 unreference: 175 while (i--) 176 drm_gem_object_put_unlocked(&planes[i]->gem); 177 178 return ERR_PTR(err); 179 } 180 181 #ifdef CONFIG_DRM_FBDEV_EMULATION 182 static int tegra_fb_mmap(struct fb_info *info, struct vm_area_struct *vma) 183 { 184 struct drm_fb_helper *helper = info->par; 185 struct tegra_bo *bo; 186 int err; 187 188 bo = tegra_fb_get_plane(helper->fb, 0); 189 190 err = drm_gem_mmap_obj(&bo->gem, bo->gem.size, vma); 191 if (err < 0) 192 return err; 193 194 return __tegra_gem_mmap(&bo->gem, vma); 195 } 196 197 static struct fb_ops tegra_fb_ops = { 198 .owner = THIS_MODULE, 199 DRM_FB_HELPER_DEFAULT_OPS, 200 .fb_fillrect = drm_fb_helper_sys_fillrect, 201 .fb_copyarea = drm_fb_helper_sys_copyarea, 202 .fb_imageblit = drm_fb_helper_sys_imageblit, 203 .fb_mmap = tegra_fb_mmap, 204 }; 205 206 static int tegra_fbdev_probe(struct drm_fb_helper *helper, 207 struct drm_fb_helper_surface_size *sizes) 208 { 209 struct tegra_fbdev *fbdev = to_tegra_fbdev(helper); 210 struct tegra_drm *tegra = helper->dev->dev_private; 211 struct drm_device *drm = helper->dev; 212 struct drm_mode_fb_cmd2 cmd = { 0 }; 213 unsigned int bytes_per_pixel; 214 struct drm_framebuffer *fb; 215 unsigned long offset; 216 struct fb_info *info; 217 struct tegra_bo *bo; 218 size_t size; 219 int err; 220 221 bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8); 222 223 cmd.width = sizes->surface_width; 224 cmd.height = sizes->surface_height; 225 cmd.pitches[0] = round_up(sizes->surface_width * bytes_per_pixel, 226 tegra->pitch_align); 227 228 cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 229 sizes->surface_depth); 230 231 size = cmd.pitches[0] * cmd.height; 232 233 bo = tegra_bo_create(drm, size, 0); 234 if (IS_ERR(bo)) 235 return PTR_ERR(bo); 236 237 info = drm_fb_helper_alloc_fbi(helper); 238 if (IS_ERR(info)) { 239 dev_err(drm->dev, "failed to allocate framebuffer info\n"); 240 drm_gem_object_put_unlocked(&bo->gem); 241 return PTR_ERR(info); 242 } 243 244 fbdev->fb = tegra_fb_alloc(drm, &cmd, &bo, 1); 245 if (IS_ERR(fbdev->fb)) { 246 err = PTR_ERR(fbdev->fb); 247 dev_err(drm->dev, "failed to allocate DRM framebuffer: %d\n", 248 err); 249 drm_gem_object_put_unlocked(&bo->gem); 250 return PTR_ERR(fbdev->fb); 251 } 252 253 fb = fbdev->fb; 254 helper->fb = fb; 255 helper->fbdev = info; 256 257 info->par = helper; 258 info->flags = FBINFO_FLAG_DEFAULT; 259 info->fbops = &tegra_fb_ops; 260 261 drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth); 262 drm_fb_helper_fill_var(info, helper, fb->width, fb->height); 263 264 offset = info->var.xoffset * bytes_per_pixel + 265 info->var.yoffset * fb->pitches[0]; 266 267 if (bo->pages) { 268 bo->vaddr = vmap(bo->pages, bo->num_pages, VM_MAP, 269 pgprot_writecombine(PAGE_KERNEL)); 270 if (!bo->vaddr) { 271 dev_err(drm->dev, "failed to vmap() framebuffer\n"); 272 err = -ENOMEM; 273 goto destroy; 274 } 275 } 276 277 drm->mode_config.fb_base = (resource_size_t)bo->paddr; 278 info->screen_base = (void __iomem *)bo->vaddr + offset; 279 info->screen_size = size; 280 info->fix.smem_start = (unsigned long)(bo->paddr + offset); 281 info->fix.smem_len = size; 282 283 return 0; 284 285 destroy: 286 drm_framebuffer_remove(fb); 287 return err; 288 } 289 290 static const struct drm_fb_helper_funcs tegra_fb_helper_funcs = { 291 .fb_probe = tegra_fbdev_probe, 292 }; 293 294 static struct tegra_fbdev *tegra_fbdev_create(struct drm_device *drm) 295 { 296 struct tegra_fbdev *fbdev; 297 298 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 299 if (!fbdev) { 300 dev_err(drm->dev, "failed to allocate DRM fbdev\n"); 301 return ERR_PTR(-ENOMEM); 302 } 303 304 drm_fb_helper_prepare(drm, &fbdev->base, &tegra_fb_helper_funcs); 305 306 return fbdev; 307 } 308 309 static void tegra_fbdev_free(struct tegra_fbdev *fbdev) 310 { 311 kfree(fbdev); 312 } 313 314 static int tegra_fbdev_init(struct tegra_fbdev *fbdev, 315 unsigned int preferred_bpp, 316 unsigned int num_crtc, 317 unsigned int max_connectors) 318 { 319 struct drm_device *drm = fbdev->base.dev; 320 int err; 321 322 err = drm_fb_helper_init(drm, &fbdev->base, max_connectors); 323 if (err < 0) { 324 dev_err(drm->dev, "failed to initialize DRM FB helper: %d\n", 325 err); 326 return err; 327 } 328 329 err = drm_fb_helper_single_add_all_connectors(&fbdev->base); 330 if (err < 0) { 331 dev_err(drm->dev, "failed to add connectors: %d\n", err); 332 goto fini; 333 } 334 335 err = drm_fb_helper_initial_config(&fbdev->base, preferred_bpp); 336 if (err < 0) { 337 dev_err(drm->dev, "failed to set initial configuration: %d\n", 338 err); 339 goto fini; 340 } 341 342 return 0; 343 344 fini: 345 drm_fb_helper_fini(&fbdev->base); 346 return err; 347 } 348 349 static void tegra_fbdev_exit(struct tegra_fbdev *fbdev) 350 { 351 drm_fb_helper_unregister_fbi(&fbdev->base); 352 353 if (fbdev->fb) { 354 struct tegra_bo *bo = tegra_fb_get_plane(fbdev->fb, 0); 355 356 /* Undo the special mapping we made in fbdev probe. */ 357 if (bo && bo->pages) { 358 vunmap(bo->vaddr); 359 bo->vaddr = NULL; 360 } 361 362 drm_framebuffer_remove(fbdev->fb); 363 } 364 365 drm_fb_helper_fini(&fbdev->base); 366 tegra_fbdev_free(fbdev); 367 } 368 #endif 369 370 int tegra_drm_fb_prepare(struct drm_device *drm) 371 { 372 #ifdef CONFIG_DRM_FBDEV_EMULATION 373 struct tegra_drm *tegra = drm->dev_private; 374 375 tegra->fbdev = tegra_fbdev_create(drm); 376 if (IS_ERR(tegra->fbdev)) 377 return PTR_ERR(tegra->fbdev); 378 #endif 379 380 return 0; 381 } 382 383 void tegra_drm_fb_free(struct drm_device *drm) 384 { 385 #ifdef CONFIG_DRM_FBDEV_EMULATION 386 struct tegra_drm *tegra = drm->dev_private; 387 388 tegra_fbdev_free(tegra->fbdev); 389 #endif 390 } 391 392 int tegra_drm_fb_init(struct drm_device *drm) 393 { 394 #ifdef CONFIG_DRM_FBDEV_EMULATION 395 struct tegra_drm *tegra = drm->dev_private; 396 int err; 397 398 err = tegra_fbdev_init(tegra->fbdev, 32, drm->mode_config.num_crtc, 399 drm->mode_config.num_connector); 400 if (err < 0) 401 return err; 402 #endif 403 404 return 0; 405 } 406 407 void tegra_drm_fb_exit(struct drm_device *drm) 408 { 409 #ifdef CONFIG_DRM_FBDEV_EMULATION 410 struct tegra_drm *tegra = drm->dev_private; 411 412 tegra_fbdev_exit(tegra->fbdev); 413 #endif 414 } 415