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                 return ERR_PTR(-ENOMEM);
 105
 106         fb->num_planes = num_planes;
 107
 108         drm_helper_mode_fill_fb_struct(&fb->base, mode_cmd);
 109
 110         for (i = 0; i < fb->num_planes; i++)
 111                 fb->planes[i] = planes[i];
 112
 113         err = drm_framebuffer_init(drm, &fb->base, &tegra_fb_funcs);
 114         if (err < 0) {
 115                 dev_err(drm->dev, "failed to initialize framebuffer: %d\n",
 116                         err);
 117                 kfree(fb->planes);
 118                 kfree(fb);
 119                 return ERR_PTR(err);
 120         }
 121
 122         return fb;
 123 }
 124
 125 static struct drm_framebuffer *tegra_fb_create(struct drm_device *drm,
 126                                                struct drm_file *file,
 127                                                struct drm_mode_fb_cmd2 *cmd)
 128 {
 129         unsigned int hsub, vsub, i;
 130         struct tegra_bo *planes[4];
 131         struct drm_gem_object *gem;
 132         struct tegra_fb *fb;
 133         int err;
 134
 135         hsub = drm_format_horz_chroma_subsampling(cmd->pixel_format);
 136         vsub = drm_format_vert_chroma_subsampling(cmd->pixel_format);
 137
 138         for (i = 0; i < drm_format_num_planes(cmd->pixel_format); i++) {
 139                 unsigned int width = cmd->width / (i ? hsub : 1);
 140                 unsigned int height = cmd->height / (i ? vsub : 1);
 141                 unsigned int size, bpp;
 142
 143                 gem = drm_gem_object_lookup(drm, file, cmd->handles[i]);
 144                 if (!gem) {
 145                         err = -ENXIO;
 146                         goto unreference;
 147                 }
 148
 149                 bpp = drm_format_plane_cpp(cmd->pixel_format, 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->base;
 169
 170 unreference:
 171         while (i--)
 172                 drm_gem_object_unreference_unlocked(&planes[i]->gem);
 173
 174         return ERR_PTR(err);
 175 }
 176
 177 #ifdef CONFIG_DRM_TEGRA_FBDEV
 178 static struct fb_ops tegra_fb_ops = {
 179         .owner = THIS_MODULE,
 180         .fb_fillrect = sys_fillrect,
 181         .fb_copyarea = sys_copyarea,
 182         .fb_imageblit = sys_imageblit,
 183         .fb_check_var = drm_fb_helper_check_var,
 184         .fb_set_par = drm_fb_helper_set_par,
 185         .fb_blank = drm_fb_helper_blank,
 186         .fb_pan_display = drm_fb_helper_pan_display,
 187         .fb_setcmap = drm_fb_helper_setcmap,
 188 };
 189
 190 static int tegra_fbdev_probe(struct drm_fb_helper *helper,
 191                              struct drm_fb_helper_surface_size *sizes)
 192 {
 193         struct tegra_fbdev *fbdev = to_tegra_fbdev(helper);
 194         struct drm_device *drm = helper->dev;
 195         struct drm_mode_fb_cmd2 cmd = { 0 };
 196         unsigned int bytes_per_pixel;
 197         struct drm_framebuffer *fb;
 198         unsigned long offset;
 199         struct fb_info *info;
 200         struct tegra_bo *bo;
 201         size_t size;
 202         int err;
 203
 204         bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
 205
 206         cmd.width = sizes->surface_width;
 207         cmd.height = sizes->surface_height;
 208         cmd.pitches[0] = sizes->surface_width * bytes_per_pixel;
 209         cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 210                                                      sizes->surface_depth);
 211
 212         size = cmd.pitches[0] * cmd.height;
 213
 214         bo = tegra_bo_create(drm, size, 0);
 215         if (IS_ERR(bo))
 216                 return PTR_ERR(bo);
 217
 218         info = framebuffer_alloc(0, drm->dev);
 219         if (!info) {
 220                 dev_err(drm->dev, "failed to allocate framebuffer info\n");
 221                 tegra_bo_free_object(&bo->gem);
 222                 return -ENOMEM;
 223         }
 224
 225         fbdev->fb = tegra_fb_alloc(drm, &cmd, &bo, 1);
 226         if (IS_ERR(fbdev->fb)) {
 227                 dev_err(drm->dev, "failed to allocate DRM framebuffer\n");
 228                 err = PTR_ERR(fbdev->fb);
 229                 goto release;
 230         }
 231
 232         fb = &fbdev->fb->base;
 233         helper->fb = fb;
 234         helper->fbdev = info;
 235
 236         info->par = helper;
 237         info->flags = FBINFO_FLAG_DEFAULT;
 238         info->fbops = &tegra_fb_ops;
 239
 240         err = fb_alloc_cmap(&info->cmap, 256, 0);
 241         if (err < 0) {
 242                 dev_err(drm->dev, "failed to allocate color map: %d\n", err);
 243                 goto destroy;
 244         }
 245
 246         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 247         drm_fb_helper_fill_var(info, helper, fb->width, fb->height);
 248
 249         offset = info->var.xoffset * bytes_per_pixel +
 250                  info->var.yoffset * fb->pitches[0];
 251
 252         drm->mode_config.fb_base = (resource_size_t)bo->paddr;
 253         info->screen_base = (void __iomem *)bo->vaddr + offset;
 254         info->screen_size = size;
 255         info->fix.smem_start = (unsigned long)(bo->paddr + offset);
 256         info->fix.smem_len = size;
 257
 258         return 0;
 259
 260 destroy:
 261         drm_framebuffer_unregister_private(fb);
 262         tegra_fb_destroy(fb);
 263 release:
 264         framebuffer_release(info);
 265         return err;
 266 }
 267
 268 static struct drm_fb_helper_funcs tegra_fb_helper_funcs = {
 269         .fb_probe = tegra_fbdev_probe,
 270 };
 271
 272 static struct tegra_fbdev *tegra_fbdev_create(struct drm_device *drm,
 273                                               unsigned int preferred_bpp,
 274                                               unsigned int num_crtc,
 275                                               unsigned int max_connectors)
 276 {
 277         struct drm_fb_helper *helper;
 278         struct tegra_fbdev *fbdev;
 279         int err;
 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         fbdev->base.funcs = &tegra_fb_helper_funcs;
 288         helper = &fbdev->base;
 289
 290         err = drm_fb_helper_init(drm, &fbdev->base, num_crtc, max_connectors);
 291         if (err < 0) {
 292                 dev_err(drm->dev, "failed to initialize DRM FB helper\n");
 293                 goto free;
 294         }
 295
 296         err = drm_fb_helper_single_add_all_connectors(&fbdev->base);
 297         if (err < 0) {
 298                 dev_err(drm->dev, "failed to add connectors\n");
 299                 goto fini;
 300         }
 301
 302         drm_helper_disable_unused_functions(drm);
 303
 304         err = drm_fb_helper_initial_config(&fbdev->base, preferred_bpp);
 305         if (err < 0) {
 306                 dev_err(drm->dev, "failed to set initial configuration\n");
 307                 goto fini;
 308         }
 309
 310         return fbdev;
 311
 312 fini:
 313         drm_fb_helper_fini(&fbdev->base);
 314 free:
 315         kfree(fbdev);
 316         return ERR_PTR(err);
 317 }
 318
 319 static void tegra_fbdev_free(struct tegra_fbdev *fbdev)
 320 {
 321         struct fb_info *info = fbdev->base.fbdev;
 322
 323         if (info) {
 324                 int err;
 325
 326                 err = unregister_framebuffer(info);
 327                 if (err < 0)
 328                         DRM_DEBUG_KMS("failed to unregister framebuffer\n");
 329
 330                 if (info->cmap.len)
 331                         fb_dealloc_cmap(&info->cmap);
 332
 333                 framebuffer_release(info);
 334         }
 335
 336         if (fbdev->fb) {
 337                 drm_framebuffer_unregister_private(&fbdev->fb->base);
 338                 tegra_fb_destroy(&fbdev->fb->base);
 339         }
 340
 341         drm_fb_helper_fini(&fbdev->base);
 342         kfree(fbdev);
 343 }
 344
 345 void tegra_fbdev_restore_mode(struct tegra_fbdev *fbdev)
 346 {
 347         if (fbdev) {
 348                 drm_modeset_lock_all(fbdev->base.dev);
 349                 drm_fb_helper_restore_fbdev_mode(&fbdev->base);
 350                 drm_modeset_unlock_all(fbdev->base.dev);
 351         }
 352 }
 353
 354 static void tegra_fb_output_poll_changed(struct drm_device *drm)
 355 {
 356         struct tegra_drm *tegra = drm->dev_private;
 357
 358         if (tegra->fbdev)
 359                 drm_fb_helper_hotplug_event(&tegra->fbdev->base);
 360 }
 361 #endif
 362
 363 static const struct drm_mode_config_funcs tegra_drm_mode_funcs = {
 364         .fb_create = tegra_fb_create,
 365 #ifdef CONFIG_DRM_TEGRA_FBDEV
 366         .output_poll_changed = tegra_fb_output_poll_changed,
 367 #endif
 368 };
 369
 370 int tegra_drm_fb_init(struct drm_device *drm)
 371 {
 372 #ifdef CONFIG_DRM_TEGRA_FBDEV
 373         struct tegra_drm *tegra = drm->dev_private;
 374 #endif
 375
 376         drm->mode_config.min_width = 0;
 377         drm->mode_config.min_height = 0;
 378
 379         drm->mode_config.max_width = 4096;
 380         drm->mode_config.max_height = 4096;
 381
 382         drm->mode_config.funcs = &tegra_drm_mode_funcs;
 383
 384 #ifdef CONFIG_DRM_TEGRA_FBDEV
 385         tegra->fbdev = tegra_fbdev_create(drm, 32, drm->mode_config.num_crtc,
 386                                           drm->mode_config.num_connector);
 387         if (IS_ERR(tegra->fbdev))
 388                 return PTR_ERR(tegra->fbdev);
 389 #endif
 390
 391         return 0;
 392 }
 393
 394 void tegra_drm_fb_exit(struct drm_device *drm)
 395 {
 396 #ifdef CONFIG_DRM_TEGRA_FBDEV
 397         struct tegra_drm *tegra = drm->dev_private;
 398
 399         tegra_fbdev_free(tegra->fbdev);
 400 #endif
 401 }