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         const struct drm_format_info *info = drm_get_format_info(drm, cmd);
 135         struct tegra_bo *planes[4];
 136         struct drm_gem_object *gem;
 137         struct drm_framebuffer *fb;
 138         unsigned int i;
 139         int err;
 140
 141         for (i = 0; i < info->num_planes; i++) {
 142                 unsigned int width = cmd->width / (i ? info->hsub : 1);
 143                 unsigned int height = cmd->height / (i ? info->vsub : 1);
 144                 unsigned int size, bpp;
 145
 146                 gem = drm_gem_object_lookup(file, cmd->handles[i]);
 147                 if (!gem) {
 148                         err = -ENXIO;
 149                         goto unreference;
 150                 }
 151
 152                 bpp = info->cpp[i];
 153
 154                 size = (height - 1) * cmd->pitches[i] +
 155                        width * bpp + cmd->offsets[i];
 156
 157                 if (gem->size < size) {
 158                         err = -EINVAL;
 159                         goto unreference;
 160                 }
 161
 162                 planes[i] = to_tegra_bo(gem);
 163         }
 164
 165         fb = tegra_fb_alloc(drm, cmd, planes, i);
 166         if (IS_ERR(fb)) {
 167                 err = PTR_ERR(fb);
 168                 goto unreference;
 169         }
 170
 171         return fb;
 172
 173 unreference:
 174         while (i--)
 175                 drm_gem_object_put_unlocked(&planes[i]->gem);
 176
 177         return ERR_PTR(err);
 178 }
 179
 180 #ifdef CONFIG_DRM_FBDEV_EMULATION
 181 static int tegra_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 182 {
 183         struct drm_fb_helper *helper = info->par;
 184         struct tegra_bo *bo;
 185         int err;
 186
 187         bo = tegra_fb_get_plane(helper->fb, 0);
 188
 189         err = drm_gem_mmap_obj(&bo->gem, bo->gem.size, vma);
 190         if (err < 0)
 191                 return err;
 192
 193         return __tegra_gem_mmap(&bo->gem, vma);
 194 }
 195
 196 static struct fb_ops tegra_fb_ops = {
 197         .owner = THIS_MODULE,
 198         DRM_FB_HELPER_DEFAULT_OPS,
 199         .fb_fillrect = drm_fb_helper_sys_fillrect,
 200         .fb_copyarea = drm_fb_helper_sys_copyarea,
 201         .fb_imageblit = drm_fb_helper_sys_imageblit,
 202         .fb_mmap = tegra_fb_mmap,
 203 };
 204
 205 static int tegra_fbdev_probe(struct drm_fb_helper *helper,
 206                              struct drm_fb_helper_surface_size *sizes)
 207 {
 208         struct tegra_fbdev *fbdev = to_tegra_fbdev(helper);
 209         struct tegra_drm *tegra = helper->dev->dev_private;
 210         struct drm_device *drm = helper->dev;
 211         struct drm_mode_fb_cmd2 cmd = { 0 };
 212         unsigned int bytes_per_pixel;
 213         struct drm_framebuffer *fb;
 214         unsigned long offset;
 215         struct fb_info *info;
 216         struct tegra_bo *bo;
 217         size_t size;
 218         int err;
 219
 220         bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
 221
 222         cmd.width = sizes->surface_width;
 223         cmd.height = sizes->surface_height;
 224         cmd.pitches[0] = round_up(sizes->surface_width * bytes_per_pixel,
 225                                   tegra->pitch_align);
 226
 227         cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 228                                                      sizes->surface_depth);
 229
 230         size = cmd.pitches[0] * cmd.height;
 231
 232         bo = tegra_bo_create(drm, size, 0);
 233         if (IS_ERR(bo))
 234                 return PTR_ERR(bo);
 235
 236         info = drm_fb_helper_alloc_fbi(helper);
 237         if (IS_ERR(info)) {
 238                 dev_err(drm->dev, "failed to allocate framebuffer info\n");
 239                 drm_gem_object_put_unlocked(&bo->gem);
 240                 return PTR_ERR(info);
 241         }
 242
 243         fbdev->fb = tegra_fb_alloc(drm, &cmd, &bo, 1);
 244         if (IS_ERR(fbdev->fb)) {
 245                 err = PTR_ERR(fbdev->fb);
 246                 dev_err(drm->dev, "failed to allocate DRM framebuffer: %d\n",
 247                         err);
 248                 drm_gem_object_put_unlocked(&bo->gem);
 249                 return PTR_ERR(fbdev->fb);
 250         }
 251
 252         fb = fbdev->fb;
 253         helper->fb = fb;
 254         helper->fbdev = info;
 255
 256         info->fbops = &tegra_fb_ops;
 257
 258         drm_fb_helper_fill_info(info, helper, sizes);
 259
 260         offset = info->var.xoffset * bytes_per_pixel +
 261                  info->var.yoffset * fb->pitches[0];
 262
 263         if (bo->pages) {
 264                 bo->vaddr = vmap(bo->pages, bo->num_pages, VM_MAP,
 265                                  pgprot_writecombine(PAGE_KERNEL));
 266                 if (!bo->vaddr) {
 267                         dev_err(drm->dev, "failed to vmap() framebuffer\n");
 268                         err = -ENOMEM;
 269                         goto destroy;
 270                 }
 271         }
 272
 273         drm->mode_config.fb_base = (resource_size_t)bo->paddr;
 274         info->screen_base = (void __iomem *)bo->vaddr + offset;
 275         info->screen_size = size;
 276         info->fix.smem_start = (unsigned long)(bo->paddr + offset);
 277         info->fix.smem_len = size;
 278
 279         return 0;
 280
 281 destroy:
 282         drm_framebuffer_remove(fb);
 283         return err;
 284 }
 285
 286 static const struct drm_fb_helper_funcs tegra_fb_helper_funcs = {
 287         .fb_probe = tegra_fbdev_probe,
 288 };
 289
 290 static struct tegra_fbdev *tegra_fbdev_create(struct drm_device *drm)
 291 {
 292         struct tegra_fbdev *fbdev;
 293
 294         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 295         if (!fbdev) {
 296                 dev_err(drm->dev, "failed to allocate DRM fbdev\n");
 297                 return ERR_PTR(-ENOMEM);
 298         }
 299
 300         drm_fb_helper_prepare(drm, &fbdev->base, &tegra_fb_helper_funcs);
 301
 302         return fbdev;
 303 }
 304
 305 static void tegra_fbdev_free(struct tegra_fbdev *fbdev)
 306 {
 307         kfree(fbdev);
 308 }
 309
 310 static int tegra_fbdev_init(struct tegra_fbdev *fbdev,
 311                             unsigned int preferred_bpp,
 312                             unsigned int num_crtc,
 313                             unsigned int max_connectors)
 314 {
 315         struct drm_device *drm = fbdev->base.dev;
 316         int err;
 317
 318         err = drm_fb_helper_init(drm, &fbdev->base, max_connectors);
 319         if (err < 0) {
 320                 dev_err(drm->dev, "failed to initialize DRM FB helper: %d\n",
 321                         err);
 322                 return err;
 323         }
 324
 325         err = drm_fb_helper_single_add_all_connectors(&fbdev->base);
 326         if (err < 0) {
 327                 dev_err(drm->dev, "failed to add connectors: %d\n", err);
 328                 goto fini;
 329         }
 330
 331         err = drm_fb_helper_initial_config(&fbdev->base, preferred_bpp);
 332         if (err < 0) {
 333                 dev_err(drm->dev, "failed to set initial configuration: %d\n",
 334                         err);
 335                 goto fini;
 336         }
 337
 338         return 0;
 339
 340 fini:
 341         drm_fb_helper_fini(&fbdev->base);
 342         return err;
 343 }
 344
 345 static void tegra_fbdev_exit(struct tegra_fbdev *fbdev)
 346 {
 347         drm_fb_helper_unregister_fbi(&fbdev->base);
 348
 349         if (fbdev->fb) {
 350                 struct tegra_bo *bo = tegra_fb_get_plane(fbdev->fb, 0);
 351
 352                 /* Undo the special mapping we made in fbdev probe. */
 353                 if (bo && bo->pages) {
 354                         vunmap(bo->vaddr);
 355                         bo->vaddr = NULL;
 356                 }
 357
 358                 drm_framebuffer_remove(fbdev->fb);
 359         }
 360
 361         drm_fb_helper_fini(&fbdev->base);
 362         tegra_fbdev_free(fbdev);
 363 }
 364 #endif
 365
 366 int tegra_drm_fb_prepare(struct drm_device *drm)
 367 {
 368 #ifdef CONFIG_DRM_FBDEV_EMULATION
 369         struct tegra_drm *tegra = drm->dev_private;
 370
 371         tegra->fbdev = tegra_fbdev_create(drm);
 372         if (IS_ERR(tegra->fbdev))
 373                 return PTR_ERR(tegra->fbdev);
 374 #endif
 375
 376         return 0;
 377 }
 378
 379 void tegra_drm_fb_free(struct drm_device *drm)
 380 {
 381 #ifdef CONFIG_DRM_FBDEV_EMULATION
 382         struct tegra_drm *tegra = drm->dev_private;
 383
 384         tegra_fbdev_free(tegra->fbdev);
 385 #endif
 386 }
 387
 388 int tegra_drm_fb_init(struct drm_device *drm)
 389 {
 390 #ifdef CONFIG_DRM_FBDEV_EMULATION
 391         struct tegra_drm *tegra = drm->dev_private;
 392         int err;
 393
 394         err = tegra_fbdev_init(tegra->fbdev, 32, drm->mode_config.num_crtc,
 395                                drm->mode_config.num_connector);
 396         if (err < 0)
 397                 return err;
 398 #endif
 399
 400         return 0;
 401 }
 402
 403 void tegra_drm_fb_exit(struct drm_device *drm)
 404 {
 405 #ifdef CONFIG_DRM_FBDEV_EMULATION
 406         struct tegra_drm *tegra = drm->dev_private;
 407
 408         tegra_fbdev_exit(tegra->fbdev);
 409 #endif
 410 }