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 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         unsigned int hsub, vsub, i;
 132         struct tegra_bo *planes[4];
 133         struct drm_gem_object *gem;
 134         struct drm_framebuffer *fb;
 135         int err;
 136
 137         hsub = drm_format_horz_chroma_subsampling(cmd->pixel_format);
 138         vsub = drm_format_vert_chroma_subsampling(cmd->pixel_format);
 139
 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;
 144
 145                 gem = drm_gem_object_lookup(file, cmd->handles[i]);
 146                 if (!gem) {
 147                         err = -ENXIO;
 148                         goto unreference;
 149                 }
 150
 151                 bpp = drm_format_plane_cpp(cmd->pixel_format, 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_unlocked(&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 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_unlocked(&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_unlocked(&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->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;
 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, max_connectors);
 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_single_add_all_connectors(&fbdev->base);
 325         if (err < 0) {
 326                 dev_err(drm->dev, "failed to add connectors: %d\n", err);
 327                 goto fini;
 328         }
 329
 330         err = drm_fb_helper_initial_config(&fbdev->base, preferred_bpp);
 331         if (err < 0) {
 332                 dev_err(drm->dev, "failed to set initial configuration: %d\n",
 333                         err);
 334                 goto fini;
 335         }
 336
 337         return 0;
 338
 339 fini:
 340         drm_fb_helper_fini(&fbdev->base);
 341         return err;
 342 }
 343
 344 static void tegra_fbdev_exit(struct tegra_fbdev *fbdev)
 345 {
 346         drm_fb_helper_unregister_fbi(&fbdev->base);
 347
 348         if (fbdev->fb) {
 349                 struct tegra_bo *bo = tegra_fb_get_plane(fbdev->fb, 0);
 350
 351                 /* Undo the special mapping we made in fbdev probe. */
 352                 if (bo && bo->pages) {
 353                         vunmap(bo->vaddr);
 354                         bo->vaddr = NULL;
 355                 }
 356
 357                 drm_framebuffer_remove(fbdev->fb);
 358         }
 359
 360         drm_fb_helper_fini(&fbdev->base);
 361         tegra_fbdev_free(fbdev);
 362 }
 363 #endif
 364
 365 int tegra_drm_fb_prepare(struct drm_device *drm)
 366 {
 367 #ifdef CONFIG_DRM_FBDEV_EMULATION
 368         struct tegra_drm *tegra = drm->dev_private;
 369
 370         tegra->fbdev = tegra_fbdev_create(drm);
 371         if (IS_ERR(tegra->fbdev))
 372                 return PTR_ERR(tegra->fbdev);
 373 #endif
 374
 375         return 0;
 376 }
 377
 378 void tegra_drm_fb_free(struct drm_device *drm)
 379 {
 380 #ifdef CONFIG_DRM_FBDEV_EMULATION
 381         struct tegra_drm *tegra = drm->dev_private;
 382
 383         tegra_fbdev_free(tegra->fbdev);
 384 #endif
 385 }
 386
 387 int tegra_drm_fb_init(struct drm_device *drm)
 388 {
 389 #ifdef CONFIG_DRM_FBDEV_EMULATION
 390         struct tegra_drm *tegra = drm->dev_private;
 391         int err;
 392
 393         err = tegra_fbdev_init(tegra->fbdev, 32, drm->mode_config.num_crtc,
 394                                drm->mode_config.num_connector);
 395         if (err < 0)
 396                 return err;
 397 #endif
 398
 399         return 0;
 400 }
 401
 402 void tegra_drm_fb_exit(struct drm_device *drm)
 403 {
 404 #ifdef CONFIG_DRM_FBDEV_EMULATION
 405         struct tegra_drm *tegra = drm->dev_private;
 406
 407         tegra_fbdev_exit(tegra->fbdev);
 408 #endif
 409 }