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 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
  26 struct tegra_bo *tegra_fb_get_plane(struct drm_framebuffer *framebuffer,
  27                                     unsigned int index)
  28 {
  29         struct tegra_fb *fb = to_tegra_fb(framebuffer);
  30
  31         if (index >= drm_format_num_planes(framebuffer->pixel_format))
  32                 return NULL;
  33
  34         return fb->planes[index];
  35 }
  36
  37 bool tegra_fb_is_bottom_up(struct drm_framebuffer *framebuffer)
  38 {
  39         struct tegra_fb *fb = to_tegra_fb(framebuffer);
  40
  41         if (fb->planes[0]->flags & TEGRA_BO_BOTTOM_UP)
  42                 return true;
  43
  44         return false;
  45 }
  46
  47 bool tegra_fb_is_tiled(struct drm_framebuffer *framebuffer)
  48 {
  49         struct tegra_fb *fb = to_tegra_fb(framebuffer);
  50
  51         if (fb->planes[0]->flags & TEGRA_BO_TILED)
  52                 return true;
  53
  54         return false;
  55 }
  56
  57 static void tegra_fb_destroy(struct drm_framebuffer *framebuffer)
  58 {
  59         struct tegra_fb *fb = to_tegra_fb(framebuffer);
  60         unsigned int i;
  61
  62         for (i = 0; i < fb->num_planes; i++) {
  63                 struct tegra_bo *bo = fb->planes[i];
  64
  65                 if (bo)
  66                         drm_gem_object_unreference_unlocked(&bo->gem);
  67         }
  68
  69         drm_framebuffer_cleanup(framebuffer);
  70         kfree(fb->planes);
  71         kfree(fb);
  72 }
  73
  74 static int tegra_fb_create_handle(struct drm_framebuffer *framebuffer,
  75                                   struct drm_file *file, unsigned int *handle)
  76 {
  77         struct tegra_fb *fb = to_tegra_fb(framebuffer);
  78
  79         return drm_gem_handle_create(file, &fb->planes[0]->gem, handle);
  80 }
  81
  82 static struct drm_framebuffer_funcs tegra_fb_funcs = {
  83         .destroy = tegra_fb_destroy,
  84         .create_handle = tegra_fb_create_handle,
  85 };
  86
  87 static struct tegra_fb *tegra_fb_alloc(struct drm_device *drm,
  88                                        struct drm_mode_fb_cmd2 *mode_cmd,
  89                                        struct tegra_bo **planes,
  90                                        unsigned int num_planes)
  91 {
  92         struct tegra_fb *fb;
  93         unsigned int i;
  94         int err;
  95
  96         fb = kzalloc(sizeof(*fb), GFP_KERNEL);
  97         if (!fb)
  98                 return ERR_PTR(-ENOMEM);
  99
 100         fb->planes = kzalloc(num_planes * sizeof(*planes), GFP_KERNEL);
 101         if (!fb->planes)
 102                 return ERR_PTR(-ENOMEM);
 103
 104         fb->num_planes = num_planes;
 105
 106         drm_helper_mode_fill_fb_struct(&fb->base, mode_cmd);
 107
 108         for (i = 0; i < fb->num_planes; i++)
 109                 fb->planes[i] = planes[i];
 110
 111         err = drm_framebuffer_init(drm, &fb->base, &tegra_fb_funcs);
 112         if (err < 0) {
 113                 dev_err(drm->dev, "failed to initialize framebuffer: %d\n",
 114                         err);
 115                 kfree(fb->planes);
 116                 kfree(fb);
 117                 return ERR_PTR(err);
 118         }
 119
 120         return fb;
 121 }
 122
 123 static struct drm_framebuffer *tegra_fb_create(struct drm_device *drm,
 124                                                struct drm_file *file,
 125                                                struct drm_mode_fb_cmd2 *cmd)
 126 {
 127         unsigned int hsub, vsub, i;
 128         struct tegra_bo *planes[4];
 129         struct drm_gem_object *gem;
 130         struct tegra_fb *fb;
 131         int err;
 132
 133         hsub = drm_format_horz_chroma_subsampling(cmd->pixel_format);
 134         vsub = drm_format_vert_chroma_subsampling(cmd->pixel_format);
 135
 136         for (i = 0; i < drm_format_num_planes(cmd->pixel_format); i++) {
 137                 unsigned int width = cmd->width / (i ? hsub : 1);
 138                 unsigned int height = cmd->height / (i ? vsub : 1);
 139                 unsigned int size, bpp;
 140
 141                 gem = drm_gem_object_lookup(drm, file, cmd->handles[i]);
 142                 if (!gem) {
 143                         err = -ENXIO;
 144                         goto unreference;
 145                 }
 146
 147                 bpp = drm_format_plane_cpp(cmd->pixel_format, i);
 148
 149                 size = (height - 1) * cmd->pitches[i] +
 150                        width * bpp + cmd->offsets[i];
 151
 152                 if (gem->size < size) {
 153                         err = -EINVAL;
 154                         goto unreference;
 155                 }
 156
 157                 planes[i] = to_tegra_bo(gem);
 158         }
 159
 160         fb = tegra_fb_alloc(drm, cmd, planes, i);
 161         if (IS_ERR(fb)) {
 162                 err = PTR_ERR(fb);
 163                 goto unreference;
 164         }
 165
 166         return &fb->base;
 167
 168 unreference:
 169         while (i--)
 170                 drm_gem_object_unreference_unlocked(&planes[i]->gem);
 171
 172         return ERR_PTR(err);
 173 }
 174
 175 static struct fb_ops tegra_fb_ops = {
 176         .owner = THIS_MODULE,
 177         .fb_fillrect = sys_fillrect,
 178         .fb_copyarea = sys_copyarea,
 179         .fb_imageblit = sys_imageblit,
 180         .fb_check_var = drm_fb_helper_check_var,
 181         .fb_set_par = drm_fb_helper_set_par,
 182         .fb_blank = drm_fb_helper_blank,
 183         .fb_pan_display = drm_fb_helper_pan_display,
 184         .fb_setcmap = drm_fb_helper_setcmap,
 185 };
 186
 187 static int tegra_fbdev_probe(struct drm_fb_helper *helper,
 188                              struct drm_fb_helper_surface_size *sizes)
 189 {
 190         struct tegra_fbdev *fbdev = to_tegra_fbdev(helper);
 191         struct drm_device *drm = helper->dev;
 192         struct drm_mode_fb_cmd2 cmd = { 0 };
 193         unsigned int bytes_per_pixel;
 194         struct drm_framebuffer *fb;
 195         unsigned long offset;
 196         struct fb_info *info;
 197         struct tegra_bo *bo;
 198         size_t size;
 199         int err;
 200
 201         bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
 202
 203         cmd.width = sizes->surface_width;
 204         cmd.height = sizes->surface_height;
 205         cmd.pitches[0] = sizes->surface_width * bytes_per_pixel;
 206         cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 207                                                      sizes->surface_depth);
 208
 209         size = cmd.pitches[0] * cmd.height;
 210
 211         bo = tegra_bo_create(drm, size, 0);
 212         if (IS_ERR(bo))
 213                 return PTR_ERR(bo);
 214
 215         info = framebuffer_alloc(0, drm->dev);
 216         if (!info) {
 217                 dev_err(drm->dev, "failed to allocate framebuffer info\n");
 218                 tegra_bo_free_object(&bo->gem);
 219                 return -ENOMEM;
 220         }
 221
 222         fbdev->fb = tegra_fb_alloc(drm, &cmd, &bo, 1);
 223         if (IS_ERR(fbdev->fb)) {
 224                 dev_err(drm->dev, "failed to allocate DRM framebuffer\n");
 225                 err = PTR_ERR(fbdev->fb);
 226                 goto release;
 227         }
 228
 229         fb = &fbdev->fb->base;
 230         helper->fb = fb;
 231         helper->fbdev = info;
 232
 233         info->par = helper;
 234         info->flags = FBINFO_FLAG_DEFAULT;
 235         info->fbops = &tegra_fb_ops;
 236
 237         err = fb_alloc_cmap(&info->cmap, 256, 0);
 238         if (err < 0) {
 239                 dev_err(drm->dev, "failed to allocate color map: %d\n", err);
 240                 goto destroy;
 241         }
 242
 243         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 244         drm_fb_helper_fill_var(info, helper, fb->width, fb->height);
 245
 246         offset = info->var.xoffset * bytes_per_pixel +
 247                  info->var.yoffset * fb->pitches[0];
 248
 249         drm->mode_config.fb_base = (resource_size_t)bo->paddr;
 250         info->screen_base = (void __iomem *)bo->vaddr + offset;
 251         info->screen_size = size;
 252         info->fix.smem_start = (unsigned long)(bo->paddr + offset);
 253         info->fix.smem_len = size;
 254
 255         return 0;
 256
 257 destroy:
 258         drm_framebuffer_unregister_private(fb);
 259         tegra_fb_destroy(fb);
 260 release:
 261         framebuffer_release(info);
 262         return err;
 263 }
 264
 265 static struct drm_fb_helper_funcs tegra_fb_helper_funcs = {
 266         .fb_probe = tegra_fbdev_probe,
 267 };
 268
 269 static struct tegra_fbdev *tegra_fbdev_create(struct drm_device *drm,
 270                                               unsigned int preferred_bpp,
 271                                               unsigned int num_crtc,
 272                                               unsigned int max_connectors)
 273 {
 274         struct drm_fb_helper *helper;
 275         struct tegra_fbdev *fbdev;
 276         int err;
 277
 278         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 279         if (!fbdev) {
 280                 dev_err(drm->dev, "failed to allocate DRM fbdev\n");
 281                 return ERR_PTR(-ENOMEM);
 282         }
 283
 284         fbdev->base.funcs = &tegra_fb_helper_funcs;
 285         helper = &fbdev->base;
 286
 287         err = drm_fb_helper_init(drm, &fbdev->base, num_crtc, max_connectors);
 288         if (err < 0) {
 289                 dev_err(drm->dev, "failed to initialize DRM FB helper\n");
 290                 goto free;
 291         }
 292
 293         err = drm_fb_helper_single_add_all_connectors(&fbdev->base);
 294         if (err < 0) {
 295                 dev_err(drm->dev, "failed to add connectors\n");
 296                 goto fini;
 297         }
 298
 299         drm_helper_disable_unused_functions(drm);
 300
 301         err = drm_fb_helper_initial_config(&fbdev->base, preferred_bpp);
 302         if (err < 0) {
 303                 dev_err(drm->dev, "failed to set initial configuration\n");
 304                 goto fini;
 305         }
 306
 307         return fbdev;
 308
 309 fini:
 310         drm_fb_helper_fini(&fbdev->base);
 311 free:
 312         kfree(fbdev);
 313         return ERR_PTR(err);
 314 }
 315
 316 static void tegra_fbdev_free(struct tegra_fbdev *fbdev)
 317 {
 318         struct fb_info *info = fbdev->base.fbdev;
 319
 320         if (info) {
 321                 int err;
 322
 323                 err = unregister_framebuffer(info);
 324                 if (err < 0)
 325                         DRM_DEBUG_KMS("failed to unregister framebuffer\n");
 326
 327                 if (info->cmap.len)
 328                         fb_dealloc_cmap(&info->cmap);
 329
 330                 framebuffer_release(info);
 331         }
 332
 333         if (fbdev->fb) {
 334                 drm_framebuffer_unregister_private(&fbdev->fb->base);
 335                 tegra_fb_destroy(&fbdev->fb->base);
 336         }
 337
 338         drm_fb_helper_fini(&fbdev->base);
 339         kfree(fbdev);
 340 }
 341
 342 static void tegra_fb_output_poll_changed(struct drm_device *drm)
 343 {
 344         struct tegra_drm *tegra = drm->dev_private;
 345
 346         if (tegra->fbdev)
 347                 drm_fb_helper_hotplug_event(&tegra->fbdev->base);
 348 }
 349
 350 static const struct drm_mode_config_funcs tegra_drm_mode_funcs = {
 351         .fb_create = tegra_fb_create,
 352         .output_poll_changed = tegra_fb_output_poll_changed,
 353 };
 354
 355 int tegra_drm_fb_init(struct drm_device *drm)
 356 {
 357         struct tegra_drm *tegra = drm->dev_private;
 358         struct tegra_fbdev *fbdev;
 359
 360         drm->mode_config.min_width = 0;
 361         drm->mode_config.min_height = 0;
 362
 363         drm->mode_config.max_width = 4096;
 364         drm->mode_config.max_height = 4096;
 365
 366         drm->mode_config.funcs = &tegra_drm_mode_funcs;
 367
 368         fbdev = tegra_fbdev_create(drm, 32, drm->mode_config.num_crtc,
 369                                    drm->mode_config.num_connector);
 370         if (IS_ERR(fbdev))
 371                 return PTR_ERR(fbdev);
 372
 373         tegra->fbdev = fbdev;
 374
 375         return 0;
 376 }
 377
 378 void tegra_drm_fb_exit(struct drm_device *drm)
 379 {
 380         struct tegra_drm *tegra = drm->dev_private;
 381
 382         tegra_fbdev_free(tegra->fbdev);
 383 }
 384
 385 void tegra_fbdev_restore_mode(struct tegra_fbdev *fbdev)
 386 {
 387         if (fbdev) {
 388                 drm_modeset_lock_all(fbdev->base.dev);
 389                 drm_fb_helper_restore_fbdev_mode(&fbdev->base);
 390                 drm_modeset_unlock_all(fbdev->base.dev);
 391         }
 392 }