drivers/gpu/drm/tegra/fb.c

   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 Devices Inc.
   8  */
   9
  10 #include <linux/console.h>
  11
  12 #include <drm/drm_fourcc.h>
  13 #include <drm/drm_gem_framebuffer_helper.h>
  14 #include <drm/drm_modeset_helper.h>
  15
  16 #include "drm.h"
  17 #include "gem.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         const struct drm_format_info *info = drm_get_format_info(drm, cmd);
 134         struct tegra_bo *planes[4];
 135         struct drm_gem_object *gem;
 136         struct drm_framebuffer *fb;
 137         unsigned int i;
 138         int err;
 139
 140         for (i = 0; i < info->num_planes; i++) {
 141                 unsigned int width = cmd->width / (i ? info->hsub : 1);
 142                 unsigned int height = cmd->height / (i ? info->vsub : 1);
 143                 unsigned int size, bpp;
 144
 145                 gem = drm_gem_object_lookup(file, cmd->handles[i]);
 146                 if (!gem) {
 147                         err = -ENXIO;
 148                         goto unreference;
 149                 }
 150
 151                 bpp = info->cpp[i];
 152
 153                 size = (height - 1) * cmd->pitches[i] +
 154                        width * bpp + cmd->offsets[i];
 155
 156                 if (gem->size < size) {
 157                         err = -EINVAL;
 158                         goto unreference;
 159                 }
 160
 161                 planes[i] = to_tegra_bo(gem);
 162         }
 163
 164         fb = tegra_fb_alloc(drm, cmd, planes, i);
 165         if (IS_ERR(fb)) {
 166                 err = PTR_ERR(fb);
 167                 goto unreference;
 168         }
 169
 170         return fb;
 171
 172 unreference:
 173         while (i--)
 174                 drm_gem_object_put(&planes[i]->gem);
 175
 176         return ERR_PTR(err);
 177 }
 178
 179 #ifdef CONFIG_DRM_FBDEV_EMULATION
 180 static int tegra_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 181 {
 182         struct drm_fb_helper *helper = info->par;
 183         struct tegra_bo *bo;
 184         int err;
 185
 186         bo = tegra_fb_get_plane(helper->fb, 0);
 187
 188         err = drm_gem_mmap_obj(&bo->gem, bo->gem.size, vma);
 189         if (err < 0)
 190                 return err;
 191
 192         return __tegra_gem_mmap(&bo->gem, vma);
 193 }
 194
 195 static const 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,
 202 };
 203
 204 static int tegra_fbdev_probe(struct drm_fb_helper *helper,
 205                              struct drm_fb_helper_surface_size *sizes)
 206 {
 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;
 215         struct tegra_bo *bo;
 216         size_t size;
 217         int err;
 218
 219         bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
 220
 221         cmd.width = sizes->surface_width;
 222         cmd.height = sizes->surface_height;
 223         cmd.pitches[0] = round_up(sizes->surface_width * bytes_per_pixel,
 224                                   tegra->pitch_align);
 225
 226         cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 227                                                      sizes->surface_depth);
 228
 229         size = cmd.pitches[0] * cmd.height;
 230
 231         bo = tegra_bo_create(drm, size, 0);
 232         if (IS_ERR(bo))
 233                 return PTR_ERR(bo);
 234
 235         info = drm_fb_helper_alloc_fbi(helper);
 236         if (IS_ERR(info)) {
 237                 dev_err(drm->dev, "failed to allocate framebuffer info\n");
 238                 drm_gem_object_put(&bo->gem);
 239                 return PTR_ERR(info);
 240         }
 241
 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",
 246                         err);
 247                 drm_gem_object_put(&bo->gem);
 248                 return PTR_ERR(fbdev->fb);
 249         }
 250
 251         fb = fbdev->fb;
 252         helper->fb = fb;
 253         helper->fbdev = info;
 254
 255         info->fbops = &tegra_fb_ops;
 256
 257         drm_fb_helper_fill_info(info, helper, sizes);
 258
 259         offset = info->var.xoffset * bytes_per_pixel +
 260                  info->var.yoffset * fb->pitches[0];
 261
 262         if (bo->pages) {
 263                 bo->vaddr = vmap(bo->pages, bo->num_pages, VM_MAP,
 264                                  pgprot_writecombine(PAGE_KERNEL));
 265                 if (!bo->vaddr) {
 266                         dev_err(drm->dev, "failed to vmap() framebuffer\n");
 267                         err = -ENOMEM;
 268                         goto destroy;
 269                 }
 270         }
 271
 272         drm->mode_config.fb_base = (resource_size_t)bo->iova;
 273         info->screen_base = (void __iomem *)bo->vaddr + offset;
 274         info->screen_size = size;
 275         info->fix.smem_start = (unsigned long)(bo->iova + offset);
 276         info->fix.smem_len = size;
 277
 278         return 0;
 279
 280 destroy:
 281         drm_framebuffer_remove(fb);
 282         return err;
 283 }
 284
 285 static const struct drm_fb_helper_funcs tegra_fb_helper_funcs = {
 286         .fb_probe = tegra_fbdev_probe,
 287 };
 288
 289 static struct tegra_fbdev *tegra_fbdev_create(struct drm_device *drm)
 290 {
 291         struct tegra_fbdev *fbdev;
 292
 293         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 294         if (!fbdev) {
 295                 dev_err(drm->dev, "failed to allocate DRM fbdev\n");
 296                 return ERR_PTR(-ENOMEM);
 297         }
 298
 299         drm_fb_helper_prepare(drm, &fbdev->base, &tegra_fb_helper_funcs);
 300
 301         return fbdev;
 302 }
 303
 304 static void tegra_fbdev_free(struct tegra_fbdev *fbdev)
 305 {
 306         kfree(fbdev);
 307 }
 308
 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)
 313 {
 314         struct drm_device *drm = fbdev->base.dev;
 315         int err;
 316
 317         err = drm_fb_helper_init(drm, &fbdev->base);
 318         if (err < 0) {
 319                 dev_err(drm->dev, "failed to initialize DRM FB helper: %d\n",
 320                         err);
 321                 return err;
 322         }
 323
 324         err = drm_fb_helper_initial_config(&fbdev->base, preferred_bpp);
 325         if (err < 0) {
 326                 dev_err(drm->dev, "failed to set initial configuration: %d\n",
 327                         err);
 328                 goto fini;
 329         }
 330
 331         return 0;
 332
 333 fini:
 334         drm_fb_helper_fini(&fbdev->base);
 335         return err;
 336 }
 337
 338 static void tegra_fbdev_exit(struct tegra_fbdev *fbdev)
 339 {
 340         drm_fb_helper_unregister_fbi(&fbdev->base);
 341
 342         if (fbdev->fb) {
 343                 struct tegra_bo *bo = tegra_fb_get_plane(fbdev->fb, 0);
 344
 345                 /* Undo the special mapping we made in fbdev probe. */
 346                 if (bo && bo->pages) {
 347                         vunmap(bo->vaddr);
 348                         bo->vaddr = NULL;
 349                 }
 350
 351                 drm_framebuffer_remove(fbdev->fb);
 352         }
 353
 354         drm_fb_helper_fini(&fbdev->base);
 355         tegra_fbdev_free(fbdev);
 356 }
 357 #endif
 358
 359 int tegra_drm_fb_prepare(struct drm_device *drm)
 360 {
 361 #ifdef CONFIG_DRM_FBDEV_EMULATION
 362         struct tegra_drm *tegra = drm->dev_private;
 363
 364         tegra->fbdev = tegra_fbdev_create(drm);
 365         if (IS_ERR(tegra->fbdev))
 366                 return PTR_ERR(tegra->fbdev);
 367 #endif
 368
 369         return 0;
 370 }
 371
 372 void tegra_drm_fb_free(struct drm_device *drm)
 373 {
 374 #ifdef CONFIG_DRM_FBDEV_EMULATION
 375         struct tegra_drm *tegra = drm->dev_private;
 376
 377         tegra_fbdev_free(tegra->fbdev);
 378 #endif
 379 }
 380
 381 int tegra_drm_fb_init(struct drm_device *drm)
 382 {
 383 #ifdef CONFIG_DRM_FBDEV_EMULATION
 384         struct tegra_drm *tegra = drm->dev_private;
 385         int err;
 386
 387         err = tegra_fbdev_init(tegra->fbdev, 32, drm->mode_config.num_crtc,
 388                                drm->mode_config.num_connector);
 389         if (err < 0)
 390                 return err;
 391 #endif
 392
 393         return 0;
 394 }
 395
 396 void tegra_drm_fb_exit(struct drm_device *drm)
 397 {
 398 #ifdef CONFIG_DRM_FBDEV_EMULATION
 399         struct tegra_drm *tegra = drm->dev_private;
 400
 401         tegra_fbdev_exit(tegra->fbdev);
 402 #endif
 403 }