drivers/gpu/drm/tegra/fb.c

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