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         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 }