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 bool tegra_fb_is_tiled(struct drm_framebuffer *framebuffer)
  50 {
  51         struct tegra_fb *fb = to_tegra_fb(framebuffer);
  52
  53         if (fb->planes[0]->flags & TEGRA_BO_TILED)
  54                 return true;
  55
  56         return false;
  57 }
  58
  59 static void tegra_fb_destroy(struct drm_framebuffer *framebuffer)
  60 {
  61         struct tegra_fb *fb = to_tegra_fb(framebuffer);
  62         unsigned int i;
  63
  64         for (i = 0; i < fb->num_planes; i++) {
  65                 struct tegra_bo *bo = fb->planes[i];
  66
  67                 if (bo)
  68                         drm_gem_object_unreference_unlocked(&bo->gem);
  69         }
  70
  71         drm_framebuffer_cleanup(framebuffer);
  72         kfree(fb->planes);
  73         kfree(fb);
  74 }
  75
  76 static int tegra_fb_create_handle(struct drm_framebuffer *framebuffer,
  77                                   struct drm_file *file, unsigned int *handle)
  78 {
  79         struct tegra_fb *fb = to_tegra_fb(framebuffer);
  80
  81         return drm_gem_handle_create(file, &fb->planes[0]->gem, handle);
  82 }
  83
  84 static struct drm_framebuffer_funcs tegra_fb_funcs = {
  85         .destroy = tegra_fb_destroy,
  86         .create_handle = tegra_fb_create_handle,
  87 };
  88
  89 static struct tegra_fb *tegra_fb_alloc(struct drm_device *drm,
  90                                        struct drm_mode_fb_cmd2 *mode_cmd,
  91                                        struct tegra_bo **planes,
  92                                        unsigned int num_planes)
  93 {
  94         struct tegra_fb *fb;
  95         unsigned int i;
  96         int err;
  97
  98         fb = kzalloc(sizeof(*fb), GFP_KERNEL);
  99         if (!fb)
 100                 return ERR_PTR(-ENOMEM);
 101
 102         fb->planes = kzalloc(num_planes * sizeof(*planes), GFP_KERNEL);
 103         if (!fb->planes) {
 104                 kfree(fb);
 105                 return ERR_PTR(-ENOMEM);
 106         }
 107
 108         fb->num_planes = num_planes;
 109
 110         drm_helper_mode_fill_fb_struct(&fb->base, mode_cmd);
 111
 112         for (i = 0; i < fb->num_planes; i++)
 113                 fb->planes[i] = planes[i];
 114
 115         err = drm_framebuffer_init(drm, &fb->base, &tegra_fb_funcs);
 116         if (err < 0) {
 117                 dev_err(drm->dev, "failed to initialize framebuffer: %d\n",
 118                         err);
 119                 kfree(fb->planes);
 120                 kfree(fb);
 121                 return ERR_PTR(err);
 122         }
 123
 124         return fb;
 125 }
 126
 127 static struct drm_framebuffer *tegra_fb_create(struct drm_device *drm,
 128                                                struct drm_file *file,
 129                                                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 tegra_fb *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(drm, 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->base;
 171
 172 unreference:
 173         while (i--)
 174                 drm_gem_object_unreference_unlocked(&planes[i]->gem);
 175
 176         return ERR_PTR(err);
 177 }
 178
 179 #ifdef CONFIG_DRM_TEGRA_FBDEV
 180 static struct fb_ops tegra_fb_ops = {
 181         .owner = THIS_MODULE,
 182         .fb_fillrect = sys_fillrect,
 183         .fb_copyarea = sys_copyarea,
 184         .fb_imageblit = sys_imageblit,
 185         .fb_check_var = drm_fb_helper_check_var,
 186         .fb_set_par = drm_fb_helper_set_par,
 187         .fb_blank = drm_fb_helper_blank,
 188         .fb_pan_display = drm_fb_helper_pan_display,
 189         .fb_setcmap = drm_fb_helper_setcmap,
 190 };
 191
 192 static int tegra_fbdev_probe(struct drm_fb_helper *helper,
 193                              struct drm_fb_helper_surface_size *sizes)
 194 {
 195         struct tegra_fbdev *fbdev = to_tegra_fbdev(helper);
 196         struct drm_device *drm = helper->dev;
 197         struct drm_mode_fb_cmd2 cmd = { 0 };
 198         unsigned int bytes_per_pixel;
 199         struct drm_framebuffer *fb;
 200         unsigned long offset;
 201         struct fb_info *info;
 202         struct tegra_bo *bo;
 203         size_t size;
 204         int err;
 205
 206         bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
 207
 208         cmd.width = sizes->surface_width;
 209         cmd.height = sizes->surface_height;
 210         cmd.pitches[0] = sizes->surface_width * bytes_per_pixel;
 211         cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 212                                                      sizes->surface_depth);
 213
 214         size = cmd.pitches[0] * cmd.height;
 215
 216         bo = tegra_bo_create(drm, size, 0);
 217         if (IS_ERR(bo))
 218                 return PTR_ERR(bo);
 219
 220         info = framebuffer_alloc(0, drm->dev);
 221         if (!info) {
 222                 dev_err(drm->dev, "failed to allocate framebuffer info\n");
 223                 tegra_bo_free_object(&bo->gem);
 224                 return -ENOMEM;
 225         }
 226
 227         fbdev->fb = tegra_fb_alloc(drm, &cmd, &bo, 1);
 228         if (IS_ERR(fbdev->fb)) {
 229                 dev_err(drm->dev, "failed to allocate DRM framebuffer\n");
 230                 err = PTR_ERR(fbdev->fb);
 231                 goto release;
 232         }
 233
 234         fb = &fbdev->fb->base;
 235         helper->fb = fb;
 236         helper->fbdev = info;
 237
 238         info->par = helper;
 239         info->flags = FBINFO_FLAG_DEFAULT;
 240         info->fbops = &tegra_fb_ops;
 241
 242         err = fb_alloc_cmap(&info->cmap, 256, 0);
 243         if (err < 0) {
 244                 dev_err(drm->dev, "failed to allocate color map: %d\n", err);
 245                 goto destroy;
 246         }
 247
 248         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 249         drm_fb_helper_fill_var(info, helper, fb->width, fb->height);
 250
 251         offset = info->var.xoffset * bytes_per_pixel +
 252                  info->var.yoffset * fb->pitches[0];
 253
 254         drm->mode_config.fb_base = (resource_size_t)bo->paddr;
 255         info->screen_base = (void __iomem *)bo->vaddr + offset;
 256         info->screen_size = size;
 257         info->fix.smem_start = (unsigned long)(bo->paddr + offset);
 258         info->fix.smem_len = size;
 259
 260         return 0;
 261
 262 destroy:
 263         drm_framebuffer_unregister_private(fb);
 264         tegra_fb_destroy(fb);
 265 release:
 266         framebuffer_release(info);
 267         return err;
 268 }
 269
 270 static struct drm_fb_helper_funcs tegra_fb_helper_funcs = {
 271         .fb_probe = tegra_fbdev_probe,
 272 };
 273
 274 static struct tegra_fbdev *tegra_fbdev_create(struct drm_device *drm,
 275                                               unsigned int preferred_bpp,
 276                                               unsigned int num_crtc,
 277                                               unsigned int max_connectors)
 278 {
 279         struct drm_fb_helper *helper;
 280         struct tegra_fbdev *fbdev;
 281         int err;
 282
 283         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 284         if (!fbdev) {
 285                 dev_err(drm->dev, "failed to allocate DRM fbdev\n");
 286                 return ERR_PTR(-ENOMEM);
 287         }
 288
 289         fbdev->base.funcs = &tegra_fb_helper_funcs;
 290         helper = &fbdev->base;
 291
 292         err = drm_fb_helper_init(drm, &fbdev->base, num_crtc, max_connectors);
 293         if (err < 0) {
 294                 dev_err(drm->dev, "failed to initialize DRM FB helper\n");
 295                 goto free;
 296         }
 297
 298         err = drm_fb_helper_single_add_all_connectors(&fbdev->base);
 299         if (err < 0) {
 300                 dev_err(drm->dev, "failed to add connectors\n");
 301                 goto fini;
 302         }
 303
 304         drm_helper_disable_unused_functions(drm);
 305
 306         err = drm_fb_helper_initial_config(&fbdev->base, preferred_bpp);
 307         if (err < 0) {
 308                 dev_err(drm->dev, "failed to set initial configuration\n");
 309                 goto fini;
 310         }
 311
 312         return fbdev;
 313
 314 fini:
 315         drm_fb_helper_fini(&fbdev->base);
 316 free:
 317         kfree(fbdev);
 318         return ERR_PTR(err);
 319 }
 320
 321 static void tegra_fbdev_free(struct tegra_fbdev *fbdev)
 322 {
 323         struct fb_info *info = fbdev->base.fbdev;
 324
 325         if (info) {
 326                 int err;
 327
 328                 err = unregister_framebuffer(info);
 329                 if (err < 0)
 330                         DRM_DEBUG_KMS("failed to unregister framebuffer\n");
 331
 332                 if (info->cmap.len)
 333                         fb_dealloc_cmap(&info->cmap);
 334
 335                 framebuffer_release(info);
 336         }
 337
 338         if (fbdev->fb) {
 339                 drm_framebuffer_unregister_private(&fbdev->fb->base);
 340                 tegra_fb_destroy(&fbdev->fb->base);
 341         }
 342
 343         drm_fb_helper_fini(&fbdev->base);
 344         kfree(fbdev);
 345 }
 346
 347 void tegra_fbdev_restore_mode(struct tegra_fbdev *fbdev)
 348 {
 349         if (fbdev) {
 350                 drm_modeset_lock_all(fbdev->base.dev);
 351                 drm_fb_helper_restore_fbdev_mode(&fbdev->base);
 352                 drm_modeset_unlock_all(fbdev->base.dev);
 353         }
 354 }
 355
 356 static void tegra_fb_output_poll_changed(struct drm_device *drm)
 357 {
 358         struct tegra_drm *tegra = drm->dev_private;
 359
 360         if (tegra->fbdev)
 361                 drm_fb_helper_hotplug_event(&tegra->fbdev->base);
 362 }
 363 #endif
 364
 365 static const struct drm_mode_config_funcs tegra_drm_mode_funcs = {
 366         .fb_create = tegra_fb_create,
 367 #ifdef CONFIG_DRM_TEGRA_FBDEV
 368         .output_poll_changed = tegra_fb_output_poll_changed,
 369 #endif
 370 };
 371
 372 int tegra_drm_fb_init(struct drm_device *drm)
 373 {
 374 #ifdef CONFIG_DRM_TEGRA_FBDEV
 375         struct tegra_drm *tegra = drm->dev_private;
 376 #endif
 377
 378         drm->mode_config.min_width = 0;
 379         drm->mode_config.min_height = 0;
 380
 381         drm->mode_config.max_width = 4096;
 382         drm->mode_config.max_height = 4096;
 383
 384         drm->mode_config.funcs = &tegra_drm_mode_funcs;
 385
 386 #ifdef CONFIG_DRM_TEGRA_FBDEV
 387         tegra->fbdev = tegra_fbdev_create(drm, 32, drm->mode_config.num_crtc,
 388                                           drm->mode_config.num_connector);
 389         if (IS_ERR(tegra->fbdev))
 390                 return PTR_ERR(tegra->fbdev);
 391 #endif
 392
 393         return 0;
 394 }
 395
 396 void tegra_drm_fb_exit(struct drm_device *drm)
 397 {
 398 #ifdef CONFIG_DRM_TEGRA_FBDEV
 399         struct tegra_drm *tegra = drm->dev_private;
 400
 401         tegra_fbdev_free(tegra->fbdev);
 402 #endif
 403 }