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 "drm.h"
  14 #include "gem.h"
  15
  16 static inline struct tegra_fb *to_tegra_fb(struct drm_framebuffer *fb)
  17 {
  18         return container_of(fb, struct tegra_fb, base);
  19 }
  20
  21 #ifdef CONFIG_DRM_TEGRA_FBDEV
  22 static inline struct tegra_fbdev *to_tegra_fbdev(struct drm_fb_helper *helper)
  23 {
  24         return container_of(helper, struct tegra_fbdev, base);
  25 }
  26 #endif
  27
  28 struct tegra_bo *tegra_fb_get_plane(struct drm_framebuffer *framebuffer,
  29                                     unsigned int index)
  30 {
  31         struct tegra_fb *fb = to_tegra_fb(framebuffer);
  32
  33         if (index >= drm_format_num_planes(framebuffer->pixel_format))
  34                 return NULL;
  35
  36         return fb->planes[index];
  37 }
  38
  39 bool tegra_fb_is_bottom_up(struct drm_framebuffer *framebuffer)
  40 {
  41         struct tegra_fb *fb = to_tegra_fb(framebuffer);
  42
  43         if (fb->planes[0]->flags & TEGRA_BO_BOTTOM_UP)
  44                 return true;
  45
  46         return false;
  47 }
  48
  49 int tegra_fb_get_tiling(struct drm_framebuffer *framebuffer,
  50                         struct tegra_bo_tiling *tiling)
  51 {
  52         struct tegra_fb *fb = to_tegra_fb(framebuffer);
  53
  54         /* TODO: handle YUV formats? */
  55         *tiling = fb->planes[0]->tiling;
  56
  57         return 0;
  58 }
  59
  60 static void tegra_fb_destroy(struct drm_framebuffer *framebuffer)
  61 {
  62         struct tegra_fb *fb = to_tegra_fb(framebuffer);
  63         unsigned int i;
  64
  65         for (i = 0; i < fb->num_planes; i++) {
  66                 struct tegra_bo *bo = fb->planes[i];
  67
  68                 if (bo)
  69                         drm_gem_object_unreference_unlocked(&bo->gem);
  70         }
  71
  72         drm_framebuffer_cleanup(framebuffer);
  73         kfree(fb->planes);
  74         kfree(fb);
  75 }
  76
  77 static int tegra_fb_create_handle(struct drm_framebuffer *framebuffer,
  78                                   struct drm_file *file, unsigned int *handle)
  79 {
  80         struct tegra_fb *fb = to_tegra_fb(framebuffer);
  81
  82         return drm_gem_handle_create(file, &fb->planes[0]->gem, handle);
  83 }
  84
  85 static struct drm_framebuffer_funcs tegra_fb_funcs = {
  86         .destroy = tegra_fb_destroy,
  87         .create_handle = tegra_fb_create_handle,
  88 };
  89
  90 static struct tegra_fb *tegra_fb_alloc(struct drm_device *drm,
  91                                        struct drm_mode_fb_cmd2 *mode_cmd,
  92                                        struct tegra_bo **planes,
  93                                        unsigned int num_planes)
  94 {
  95         struct tegra_fb *fb;
  96         unsigned int i;
  97         int err;
  98
  99         fb = kzalloc(sizeof(*fb), GFP_KERNEL);
 100         if (!fb)
 101                 return ERR_PTR(-ENOMEM);
 102
 103         fb->planes = kzalloc(num_planes * sizeof(*planes), GFP_KERNEL);
 104         if (!fb->planes) {
 105                 kfree(fb);
 106                 return ERR_PTR(-ENOMEM);
 107         }
 108
 109         fb->num_planes = num_planes;
 110
 111         drm_helper_mode_fill_fb_struct(&fb->base, mode_cmd);
 112
 113         for (i = 0; i < fb->num_planes; i++)
 114                 fb->planes[i] = planes[i];
 115
 116         err = drm_framebuffer_init(drm, &fb->base, &tegra_fb_funcs);
 117         if (err < 0) {
 118                 dev_err(drm->dev, "failed to initialize framebuffer: %d\n",
 119                         err);
 120                 kfree(fb->planes);
 121                 kfree(fb);
 122                 return ERR_PTR(err);
 123         }
 124
 125         return fb;
 126 }
 127
 128 static struct drm_framebuffer *tegra_fb_create(struct drm_device *drm,
 129                                                struct drm_file *file,
 130                                                struct drm_mode_fb_cmd2 *cmd)
 131 {
 132         unsigned int hsub, vsub, i;
 133         struct tegra_bo *planes[4];
 134         struct drm_gem_object *gem;
 135         struct tegra_fb *fb;
 136         int err;
 137
 138         hsub = drm_format_horz_chroma_subsampling(cmd->pixel_format);
 139         vsub = drm_format_vert_chroma_subsampling(cmd->pixel_format);
 140
 141         for (i = 0; i < drm_format_num_planes(cmd->pixel_format); i++) {
 142                 unsigned int width = cmd->width / (i ? hsub : 1);
 143                 unsigned int height = cmd->height / (i ? vsub : 1);
 144                 unsigned int size, bpp;
 145
 146                 gem = drm_gem_object_lookup(drm, file, cmd->handles[i]);
 147                 if (!gem) {
 148                         err = -ENXIO;
 149                         goto unreference;
 150                 }
 151
 152                 bpp = drm_format_plane_cpp(cmd->pixel_format, 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->base;
 172
 173 unreference:
 174         while (i--)
 175                 drm_gem_object_unreference_unlocked(&planes[i]->gem);
 176
 177         return ERR_PTR(err);
 178 }
 179
 180 #ifdef CONFIG_DRM_TEGRA_FBDEV
 181 static struct fb_ops tegra_fb_ops = {
 182         .owner = THIS_MODULE,
 183         .fb_fillrect = sys_fillrect,
 184         .fb_copyarea = sys_copyarea,
 185         .fb_imageblit = sys_imageblit,
 186         .fb_check_var = drm_fb_helper_check_var,
 187         .fb_set_par = drm_fb_helper_set_par,
 188         .fb_blank = drm_fb_helper_blank,
 189         .fb_pan_display = drm_fb_helper_pan_display,
 190         .fb_setcmap = drm_fb_helper_setcmap,
 191 };
 192
 193 static int tegra_fbdev_probe(struct drm_fb_helper *helper,
 194                              struct drm_fb_helper_surface_size *sizes)
 195 {
 196         struct tegra_fbdev *fbdev = to_tegra_fbdev(helper);
 197         struct tegra_drm *tegra = helper->dev->dev_private;
 198         struct drm_device *drm = helper->dev;
 199         struct drm_mode_fb_cmd2 cmd = { 0 };
 200         unsigned int bytes_per_pixel;
 201         struct drm_framebuffer *fb;
 202         unsigned long offset;
 203         struct fb_info *info;
 204         struct tegra_bo *bo;
 205         size_t size;
 206         int err;
 207
 208         bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
 209
 210         cmd.width = sizes->surface_width;
 211         cmd.height = sizes->surface_height;
 212         cmd.pitches[0] = round_up(sizes->surface_width * bytes_per_pixel,
 213                                   tegra->pitch_align);
 214         cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 215                                                      sizes->surface_depth);
 216
 217         size = cmd.pitches[0] * cmd.height;
 218
 219         bo = tegra_bo_create(drm, size, 0);
 220         if (IS_ERR(bo))
 221                 return PTR_ERR(bo);
 222
 223         info = framebuffer_alloc(0, drm->dev);
 224         if (!info) {
 225                 dev_err(drm->dev, "failed to allocate framebuffer info\n");
 226                 tegra_bo_free_object(&bo->gem);
 227                 return -ENOMEM;
 228         }
 229
 230         fbdev->fb = tegra_fb_alloc(drm, &cmd, &bo, 1);
 231         if (IS_ERR(fbdev->fb)) {
 232                 dev_err(drm->dev, "failed to allocate DRM framebuffer\n");
 233                 err = PTR_ERR(fbdev->fb);
 234                 goto release;
 235         }
 236
 237         fb = &fbdev->fb->base;
 238         helper->fb = fb;
 239         helper->fbdev = info;
 240
 241         info->par = helper;
 242         info->flags = FBINFO_FLAG_DEFAULT;
 243         info->fbops = &tegra_fb_ops;
 244
 245         err = fb_alloc_cmap(&info->cmap, 256, 0);
 246         if (err < 0) {
 247                 dev_err(drm->dev, "failed to allocate color map: %d\n", err);
 248                 goto destroy;
 249         }
 250
 251         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 252         drm_fb_helper_fill_var(info, helper, fb->width, fb->height);
 253
 254         offset = info->var.xoffset * bytes_per_pixel +
 255                  info->var.yoffset * fb->pitches[0];
 256
 257         drm->mode_config.fb_base = (resource_size_t)bo->paddr;
 258         info->screen_base = (void __iomem *)bo->vaddr + offset;
 259         info->screen_size = size;
 260         info->fix.smem_start = (unsigned long)(bo->paddr + offset);
 261         info->fix.smem_len = size;
 262
 263         return 0;
 264
 265 destroy:
 266         drm_framebuffer_unregister_private(fb);
 267         tegra_fb_destroy(fb);
 268 release:
 269         framebuffer_release(info);
 270         return err;
 271 }
 272
 273 static const struct drm_fb_helper_funcs tegra_fb_helper_funcs = {
 274         .fb_probe = tegra_fbdev_probe,
 275 };
 276
 277 static struct tegra_fbdev *tegra_fbdev_create(struct drm_device *drm)
 278 {
 279         struct tegra_fbdev *fbdev;
 280
 281         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 282         if (!fbdev) {
 283                 dev_err(drm->dev, "failed to allocate DRM fbdev\n");
 284                 return ERR_PTR(-ENOMEM);
 285         }
 286
 287         drm_fb_helper_prepare(drm, &fbdev->base, &tegra_fb_helper_funcs);
 288
 289         return fbdev;
 290 }
 291
 292 static int tegra_fbdev_init(struct tegra_fbdev *fbdev,
 293                             unsigned int preferred_bpp,
 294                             unsigned int num_crtc,
 295                             unsigned int max_connectors)
 296 {
 297         struct drm_device *drm = fbdev->base.dev;
 298         int err;
 299
 300         err = drm_fb_helper_init(drm, &fbdev->base, num_crtc, max_connectors);
 301         if (err < 0) {
 302                 dev_err(drm->dev, "failed to initialize DRM FB helper\n");
 303                 return err;
 304         }
 305
 306         err = drm_fb_helper_single_add_all_connectors(&fbdev->base);
 307         if (err < 0) {
 308                 dev_err(drm->dev, "failed to add connectors\n");
 309                 goto fini;
 310         }
 311
 312         err = drm_fb_helper_initial_config(&fbdev->base, preferred_bpp);
 313         if (err < 0) {
 314                 dev_err(drm->dev, "failed to set initial configuration\n");
 315                 goto fini;
 316         }
 317
 318         return 0;
 319
 320 fini:
 321         drm_fb_helper_fini(&fbdev->base);
 322         return err;
 323 }
 324
 325 static void tegra_fbdev_free(struct tegra_fbdev *fbdev)
 326 {
 327         struct fb_info *info = fbdev->base.fbdev;
 328
 329         if (info) {
 330                 int err;
 331
 332                 err = unregister_framebuffer(info);
 333                 if (err < 0)
 334                         DRM_DEBUG_KMS("failed to unregister framebuffer\n");
 335
 336                 if (info->cmap.len)
 337                         fb_dealloc_cmap(&info->cmap);
 338
 339                 framebuffer_release(info);
 340         }
 341
 342         if (fbdev->fb) {
 343                 drm_framebuffer_unregister_private(&fbdev->fb->base);
 344                 tegra_fb_destroy(&fbdev->fb->base);
 345         }
 346
 347         drm_fb_helper_fini(&fbdev->base);
 348         kfree(fbdev);
 349 }
 350
 351 void tegra_fbdev_restore_mode(struct tegra_fbdev *fbdev)
 352 {
 353         if (fbdev)
 354                 drm_fb_helper_restore_fbdev_mode_unlocked(&fbdev->base);
 355 }
 356
 357 static void tegra_fb_output_poll_changed(struct drm_device *drm)
 358 {
 359         struct tegra_drm *tegra = drm->dev_private;
 360
 361         if (tegra->fbdev)
 362                 drm_fb_helper_hotplug_event(&tegra->fbdev->base);
 363 }
 364 #endif
 365
 366 static const struct drm_mode_config_funcs tegra_drm_mode_funcs = {
 367         .fb_create = tegra_fb_create,
 368 #ifdef CONFIG_DRM_TEGRA_FBDEV
 369         .output_poll_changed = tegra_fb_output_poll_changed,
 370 #endif
 371 };
 372
 373 int tegra_drm_fb_prepare(struct drm_device *drm)
 374 {
 375 #ifdef CONFIG_DRM_TEGRA_FBDEV
 376         struct tegra_drm *tegra = drm->dev_private;
 377 #endif
 378
 379         drm->mode_config.min_width = 0;
 380         drm->mode_config.min_height = 0;
 381
 382         drm->mode_config.max_width = 4096;
 383         drm->mode_config.max_height = 4096;
 384
 385         drm->mode_config.funcs = &tegra_drm_mode_funcs;
 386
 387 #ifdef CONFIG_DRM_TEGRA_FBDEV
 388         tegra->fbdev = tegra_fbdev_create(drm);
 389         if (IS_ERR(tegra->fbdev))
 390                 return PTR_ERR(tegra->fbdev);
 391 #endif
 392
 393         return 0;
 394 }
 395
 396 int tegra_drm_fb_init(struct drm_device *drm)
 397 {
 398 #ifdef CONFIG_DRM_TEGRA_FBDEV
 399         struct tegra_drm *tegra = drm->dev_private;
 400         int err;
 401
 402         err = tegra_fbdev_init(tegra->fbdev, 32, drm->mode_config.num_crtc,
 403                                drm->mode_config.num_connector);
 404         if (err < 0)
 405                 return err;
 406 #endif
 407
 408         return 0;
 409 }
 410
 411 void tegra_drm_fb_exit(struct drm_device *drm)
 412 {
 413 #ifdef CONFIG_DRM_TEGRA_FBDEV
 414         struct tegra_drm *tegra = drm->dev_private;
 415
 416         tegra_fbdev_free(tegra->fbdev);
 417 #endif
 418 }