drivers/staging/omapdrm/omap_drv.c

   1 /*
   2  * drivers/staging/omapdrm/omap_drv.c
   3  *
   4  * Copyright (C) 2011 Texas Instruments
   5  * Author: Rob Clark <rob@ti.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "omap_drv.h"
  21
  22 #include "drm_crtc_helper.h"
  23 #include "drm_fb_helper.h"
  24
  25 #define DRIVER_NAME             MODULE_NAME
  26 #define DRIVER_DESC             "OMAP DRM"
  27 #define DRIVER_DATE             "20110917"
  28 #define DRIVER_MAJOR            1
  29 #define DRIVER_MINOR            0
  30 #define DRIVER_PATCHLEVEL       0
  31
  32 struct drm_device *drm_device;
  33
  34 static int num_crtc = CONFIG_DRM_OMAP_NUM_CRTCS;
  35
  36 MODULE_PARM_DESC(num_crtc, "Number of overlays to use as CRTCs");
  37 module_param(num_crtc, int, 0600);
  38
  39 /*
  40  * mode config funcs
  41  */
  42
  43 /* Notes about mapping DSS and DRM entities:
  44  *    CRTC:        overlay
  45  *    encoder:     manager.. with some extension to allow one primary CRTC
  46  *                 and zero or more video CRTC's to be mapped to one encoder?
  47  *    connector:   dssdev.. manager can be attached/detached from different
  48  *                 devices
  49  */
  50
  51 static void omap_fb_output_poll_changed(struct drm_device *dev)
  52 {
  53         struct omap_drm_private *priv = dev->dev_private;
  54         DBG("dev=%p", dev);
  55         if (priv->fbdev) {
  56                 drm_fb_helper_hotplug_event(priv->fbdev);
  57         }
  58 }
  59
  60 static struct drm_mode_config_funcs omap_mode_config_funcs = {
  61         .fb_create = omap_framebuffer_create,
  62         .output_poll_changed = omap_fb_output_poll_changed,
  63 };
  64
  65 static int get_connector_type(struct omap_dss_device *dssdev)
  66 {
  67         switch (dssdev->type) {
  68         case OMAP_DISPLAY_TYPE_HDMI:
  69                 return DRM_MODE_CONNECTOR_HDMIA;
  70         case OMAP_DISPLAY_TYPE_DPI:
  71                 if (!strcmp(dssdev->name, "dvi"))
  72                         return DRM_MODE_CONNECTOR_DVID;
  73                 /* fallthrough */
  74         default:
  75                 return DRM_MODE_CONNECTOR_Unknown;
  76         }
  77 }
  78
  79 #if 0 /* enable when dss2 supports hotplug */
  80 static int omap_drm_notifier(struct notifier_block *nb,
  81                 unsigned long evt, void *arg)
  82 {
  83         switch (evt) {
  84         case OMAP_DSS_SIZE_CHANGE:
  85         case OMAP_DSS_HOTPLUG_CONNECT:
  86         case OMAP_DSS_HOTPLUG_DISCONNECT: {
  87                 struct drm_device *dev = drm_device;
  88                 DBG("hotplug event: evt=%d, dev=%p", evt, dev);
  89                 if (dev) {
  90                         drm_sysfs_hotplug_event(dev);
  91                 }
  92                 return NOTIFY_OK;
  93         }
  94         default:  /* don't care about other events for now */
  95                 return NOTIFY_DONE;
  96         }
  97 }
  98 #endif
  99
 100 static void dump_video_chains(void)
 101 {
 102         int i;
 103
 104         DBG("dumping video chains: ");
 105         for (i = 0; i < omap_dss_get_num_overlays(); i++) {
 106                 struct omap_overlay *ovl = omap_dss_get_overlay(i);
 107                 struct omap_overlay_manager *mgr = ovl->manager;
 108                 struct omap_dss_device *dssdev = mgr ? mgr->device : NULL;
 109                 if (dssdev) {
 110                         DBG("%d: %s -> %s -> %s", i, ovl->name, mgr->name,
 111                                                 dssdev->name);
 112                 } else if (mgr) {
 113                         DBG("%d: %s -> %s", i, ovl->name, mgr->name);
 114                 } else {
 115                         DBG("%d: %s", i, ovl->name);
 116                 }
 117         }
 118 }
 119
 120 /* create encoders for each manager */
 121 static int create_encoder(struct drm_device *dev,
 122                 struct omap_overlay_manager *mgr)
 123 {
 124         struct omap_drm_private *priv = dev->dev_private;
 125         struct drm_encoder *encoder = omap_encoder_init(dev, mgr);
 126
 127         if (!encoder) {
 128                 dev_err(dev->dev, "could not create encoder: %s\n",
 129                                 mgr->name);
 130                 return -ENOMEM;
 131         }
 132
 133         BUG_ON(priv->num_encoders >= ARRAY_SIZE(priv->encoders));
 134
 135         priv->encoders[priv->num_encoders++] = encoder;
 136
 137         return 0;
 138 }
 139
 140 /* create connectors for each display device */
 141 static int create_connector(struct drm_device *dev,
 142                 struct omap_dss_device *dssdev)
 143 {
 144         struct omap_drm_private *priv = dev->dev_private;
 145         static struct notifier_block *notifier;
 146         struct drm_connector *connector;
 147         int j;
 148
 149         if (!dssdev->driver) {
 150                 dev_warn(dev->dev, "%s has no driver.. skipping it\n",
 151                                 dssdev->name);
 152                 return 0;
 153         }
 154
 155         if (!(dssdev->driver->get_timings ||
 156                                 dssdev->driver->read_edid)) {
 157                 dev_warn(dev->dev, "%s driver does not support "
 158                         "get_timings or read_edid.. skipping it!\n",
 159                         dssdev->name);
 160                 return 0;
 161         }
 162
 163         connector = omap_connector_init(dev,
 164                         get_connector_type(dssdev), dssdev);
 165
 166         if (!connector) {
 167                 dev_err(dev->dev, "could not create connector: %s\n",
 168                                 dssdev->name);
 169                 return -ENOMEM;
 170         }
 171
 172         BUG_ON(priv->num_connectors >= ARRAY_SIZE(priv->connectors));
 173
 174         priv->connectors[priv->num_connectors++] = connector;
 175
 176 #if 0 /* enable when dss2 supports hotplug */
 177         notifier = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
 178         notifier->notifier_call = omap_drm_notifier;
 179         omap_dss_add_notify(dssdev, notifier);
 180 #else
 181         notifier = NULL;
 182 #endif
 183
 184         for (j = 0; j < priv->num_encoders; j++) {
 185                 struct omap_overlay_manager *mgr =
 186                         omap_encoder_get_manager(priv->encoders[j]);
 187                 if (mgr->device == dssdev) {
 188                         drm_mode_connector_attach_encoder(connector,
 189                                         priv->encoders[j]);
 190                 }
 191         }
 192
 193         return 0;
 194 }
 195
 196 /* create up to max_overlays CRTCs mapping to overlays.. by default,
 197  * connect the overlays to different managers/encoders, giving priority
 198  * to encoders connected to connectors with a detected connection
 199  */
 200 static int create_crtc(struct drm_device *dev, struct omap_overlay *ovl,
 201                 int *j, unsigned int connected_connectors)
 202 {
 203         struct omap_drm_private *priv = dev->dev_private;
 204         struct omap_overlay_manager *mgr = NULL;
 205         struct drm_crtc *crtc;
 206
 207         /* find next best connector, ones with detected connection first
 208          */
 209         while (*j < priv->num_connectors && !mgr) {
 210                 if (connected_connectors & (1 << *j)) {
 211                         struct drm_encoder *encoder =
 212                                 omap_connector_attached_encoder(
 213                                                 priv->connectors[*j]);
 214                         if (encoder) {
 215                                 mgr = omap_encoder_get_manager(encoder);
 216                         }
 217                 }
 218                 (*j)++;
 219         }
 220
 221         /* if we couldn't find another connected connector, lets start
 222          * looking at the unconnected connectors:
 223          *
 224          * note: it might not be immediately apparent, but thanks to
 225          * the !mgr check in both this loop and the one above, the only
 226          * way to enter this loop is with *j == priv->num_connectors,
 227          * so idx can never go negative.
 228          */
 229         while (*j < 2 * priv->num_connectors && !mgr) {
 230                 int idx = *j - priv->num_connectors;
 231                 if (!(connected_connectors & (1 << idx))) {
 232                         struct drm_encoder *encoder =
 233                                 omap_connector_attached_encoder(
 234                                                 priv->connectors[idx]);
 235                         if (encoder) {
 236                                 mgr = omap_encoder_get_manager(encoder);
 237                         }
 238                 }
 239                 (*j)++;
 240         }
 241
 242         crtc = omap_crtc_init(dev, ovl, priv->num_crtcs);
 243
 244         if (!crtc) {
 245                 dev_err(dev->dev, "could not create CRTC: %s\n",
 246                                 ovl->name);
 247                 return -ENOMEM;
 248         }
 249
 250         BUG_ON(priv->num_crtcs >= ARRAY_SIZE(priv->crtcs));
 251
 252         priv->crtcs[priv->num_crtcs++] = crtc;
 253
 254         return 0;
 255 }
 256
 257 static int create_plane(struct drm_device *dev, struct omap_overlay *ovl,
 258                 unsigned int possible_crtcs)
 259 {
 260         struct omap_drm_private *priv = dev->dev_private;
 261         struct drm_plane *plane =
 262                         omap_plane_init(dev, ovl, possible_crtcs, false);
 263
 264         if (!plane) {
 265                 dev_err(dev->dev, "could not create plane: %s\n",
 266                                 ovl->name);
 267                 return -ENOMEM;
 268         }
 269
 270         BUG_ON(priv->num_planes >= ARRAY_SIZE(priv->planes));
 271
 272         priv->planes[priv->num_planes++] = plane;
 273
 274         return 0;
 275 }
 276
 277 static int match_dev_name(struct omap_dss_device *dssdev, void *data)
 278 {
 279         return !strcmp(dssdev->name, data);
 280 }
 281
 282 static unsigned int detect_connectors(struct drm_device *dev)
 283 {
 284         struct omap_drm_private *priv = dev->dev_private;
 285         unsigned int connected_connectors = 0;
 286         int i;
 287
 288         for (i = 0; i < priv->num_connectors; i++) {
 289                 struct drm_connector *connector = priv->connectors[i];
 290                 if (omap_connector_detect(connector, true) ==
 291                                 connector_status_connected) {
 292                         connected_connectors |= (1 << i);
 293                 }
 294         }
 295
 296         return connected_connectors;
 297 }
 298
 299 static int omap_modeset_init(struct drm_device *dev)
 300 {
 301         const struct omap_drm_platform_data *pdata = dev->dev->platform_data;
 302         struct omap_kms_platform_data *kms_pdata = NULL;
 303         struct omap_drm_private *priv = dev->dev_private;
 304         struct omap_dss_device *dssdev = NULL;
 305         int i, j;
 306         unsigned int connected_connectors = 0;
 307
 308         drm_mode_config_init(dev);
 309
 310         if (pdata && pdata->kms_pdata) {
 311                 kms_pdata = pdata->kms_pdata;
 312
 313                 /* if platform data is provided by the board file, use it to
 314                  * control which overlays, managers, and devices we own.
 315                  */
 316                 for (i = 0; i < kms_pdata->mgr_cnt; i++) {
 317                         struct omap_overlay_manager *mgr =
 318                                 omap_dss_get_overlay_manager(
 319                                                 kms_pdata->mgr_ids[i]);
 320                         create_encoder(dev, mgr);
 321                 }
 322
 323                 for (i = 0; i < kms_pdata->dev_cnt; i++) {
 324                         struct omap_dss_device *dssdev =
 325                                 omap_dss_find_device(
 326                                         (void *)kms_pdata->dev_names[i],
 327                                         match_dev_name);
 328                         if (!dssdev) {
 329                                 dev_warn(dev->dev, "no such dssdev: %s\n",
 330                                                 kms_pdata->dev_names[i]);
 331                                 continue;
 332                         }
 333                         create_connector(dev, dssdev);
 334                 }
 335
 336                 connected_connectors = detect_connectors(dev);
 337
 338                 j = 0;
 339                 for (i = 0; i < kms_pdata->ovl_cnt; i++) {
 340                         struct omap_overlay *ovl =
 341                                 omap_dss_get_overlay(kms_pdata->ovl_ids[i]);
 342                         create_crtc(dev, ovl, &j, connected_connectors);
 343                 }
 344
 345                 for (i = 0; i < kms_pdata->pln_cnt; i++) {
 346                         struct omap_overlay *ovl =
 347                                 omap_dss_get_overlay(kms_pdata->pln_ids[i]);
 348                         create_plane(dev, ovl, (1 << priv->num_crtcs) - 1);
 349                 }
 350         } else {
 351                 /* otherwise just grab up to CONFIG_DRM_OMAP_NUM_CRTCS and try
 352                  * to make educated guesses about everything else
 353                  */
 354                 int max_overlays = min(omap_dss_get_num_overlays(), num_crtc);
 355
 356                 for (i = 0; i < omap_dss_get_num_overlay_managers(); i++) {
 357                         create_encoder(dev, omap_dss_get_overlay_manager(i));
 358                 }
 359
 360                 for_each_dss_dev(dssdev) {
 361                         create_connector(dev, dssdev);
 362                 }
 363
 364                 connected_connectors = detect_connectors(dev);
 365
 366                 j = 0;
 367                 for (i = 0; i < max_overlays; i++) {
 368                         create_crtc(dev, omap_dss_get_overlay(i),
 369                                         &j, connected_connectors);
 370                 }
 371
 372                 /* use any remaining overlays as drm planes */
 373                 for (; i < omap_dss_get_num_overlays(); i++) {
 374                         struct omap_overlay *ovl = omap_dss_get_overlay(i);
 375                         create_plane(dev, ovl, (1 << priv->num_crtcs) - 1);
 376                 }
 377         }
 378
 379         /* for now keep the mapping of CRTCs and encoders static.. */
 380         for (i = 0; i < priv->num_encoders; i++) {
 381                 struct drm_encoder *encoder = priv->encoders[i];
 382                 struct omap_overlay_manager *mgr =
 383                                 omap_encoder_get_manager(encoder);
 384
 385                 encoder->possible_crtcs = (1 << priv->num_crtcs) - 1;
 386
 387                 DBG("%s: possible_crtcs=%08x", mgr->name,
 388                                         encoder->possible_crtcs);
 389         }
 390
 391         dump_video_chains();
 392
 393         dev->mode_config.min_width = 32;
 394         dev->mode_config.min_height = 32;
 395
 396         /* note: eventually will need some cpu_is_omapXYZ() type stuff here
 397          * to fill in these limits properly on different OMAP generations..
 398          */
 399         dev->mode_config.max_width = 2048;
 400         dev->mode_config.max_height = 2048;
 401
 402         dev->mode_config.funcs = &omap_mode_config_funcs;
 403
 404         return 0;
 405 }
 406
 407 static void omap_modeset_free(struct drm_device *dev)
 408 {
 409         drm_mode_config_cleanup(dev);
 410 }
 411
 412 /*
 413  * drm ioctl funcs
 414  */
 415
 416
 417 static int ioctl_get_param(struct drm_device *dev, void *data,
 418                 struct drm_file *file_priv)
 419 {
 420         struct drm_omap_param *args = data;
 421
 422         DBG("%p: param=%llu", dev, args->param);
 423
 424         switch (args->param) {
 425         case OMAP_PARAM_CHIPSET_ID:
 426                 args->value = GET_OMAP_TYPE;
 427                 break;
 428         default:
 429                 DBG("unknown parameter %lld", args->param);
 430                 return -EINVAL;
 431         }
 432
 433         return 0;
 434 }
 435
 436 static int ioctl_set_param(struct drm_device *dev, void *data,
 437                 struct drm_file *file_priv)
 438 {
 439         struct drm_omap_param *args = data;
 440
 441         switch (args->param) {
 442         default:
 443                 DBG("unknown parameter %lld", args->param);
 444                 return -EINVAL;
 445         }
 446
 447         return 0;
 448 }
 449
 450 static int ioctl_gem_new(struct drm_device *dev, void *data,
 451                 struct drm_file *file_priv)
 452 {
 453         struct drm_omap_gem_new *args = data;
 454         DBG("%p:%p: size=0x%08x, flags=%08x", dev, file_priv,
 455                         args->size.bytes, args->flags);
 456         return omap_gem_new_handle(dev, file_priv, args->size,
 457                         args->flags, &args->handle);
 458 }
 459
 460 static int ioctl_gem_cpu_prep(struct drm_device *dev, void *data,
 461                 struct drm_file *file_priv)
 462 {
 463         struct drm_omap_gem_cpu_prep *args = data;
 464         struct drm_gem_object *obj;
 465         int ret;
 466
 467         VERB("%p:%p: handle=%d, op=%x", dev, file_priv, args->handle, args->op);
 468
 469         obj = drm_gem_object_lookup(dev, file_priv, args->handle);
 470         if (!obj) {
 471                 return -ENOENT;
 472         }
 473
 474         ret = omap_gem_op_sync(obj, args->op);
 475
 476         if (!ret) {
 477                 ret = omap_gem_op_start(obj, args->op);
 478         }
 479
 480         drm_gem_object_unreference_unlocked(obj);
 481
 482         return ret;
 483 }
 484
 485 static int ioctl_gem_cpu_fini(struct drm_device *dev, void *data,
 486                 struct drm_file *file_priv)
 487 {
 488         struct drm_omap_gem_cpu_fini *args = data;
 489         struct drm_gem_object *obj;
 490         int ret;
 491
 492         VERB("%p:%p: handle=%d", dev, file_priv, args->handle);
 493
 494         obj = drm_gem_object_lookup(dev, file_priv, args->handle);
 495         if (!obj) {
 496                 return -ENOENT;
 497         }
 498
 499         /* XXX flushy, flushy */
 500         ret = 0;
 501
 502         if (!ret) {
 503                 ret = omap_gem_op_finish(obj, args->op);
 504         }
 505
 506         drm_gem_object_unreference_unlocked(obj);
 507
 508         return ret;
 509 }
 510
 511 static int ioctl_gem_info(struct drm_device *dev, void *data,
 512                 struct drm_file *file_priv)
 513 {
 514         struct drm_omap_gem_info *args = data;
 515         struct drm_gem_object *obj;
 516         int ret = 0;
 517
 518         DBG("%p:%p: handle=%d", dev, file_priv, args->handle);
 519
 520         obj = drm_gem_object_lookup(dev, file_priv, args->handle);
 521         if (!obj) {
 522                 return -ENOENT;
 523         }
 524
 525         args->size = omap_gem_mmap_size(obj);
 526         args->offset = omap_gem_mmap_offset(obj);
 527
 528         drm_gem_object_unreference_unlocked(obj);
 529
 530         return ret;
 531 }
 532
 533 struct drm_ioctl_desc ioctls[DRM_COMMAND_END - DRM_COMMAND_BASE] = {
 534         DRM_IOCTL_DEF_DRV(OMAP_GET_PARAM, ioctl_get_param, DRM_UNLOCKED|DRM_AUTH),
 535         DRM_IOCTL_DEF_DRV(OMAP_SET_PARAM, ioctl_set_param, DRM_UNLOCKED|DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 536         DRM_IOCTL_DEF_DRV(OMAP_GEM_NEW, ioctl_gem_new, DRM_UNLOCKED|DRM_AUTH),
 537         DRM_IOCTL_DEF_DRV(OMAP_GEM_CPU_PREP, ioctl_gem_cpu_prep, DRM_UNLOCKED|DRM_AUTH),
 538         DRM_IOCTL_DEF_DRV(OMAP_GEM_CPU_FINI, ioctl_gem_cpu_fini, DRM_UNLOCKED|DRM_AUTH),
 539         DRM_IOCTL_DEF_DRV(OMAP_GEM_INFO, ioctl_gem_info, DRM_UNLOCKED|DRM_AUTH),
 540 };
 541
 542 /*
 543  * drm driver funcs
 544  */
 545
 546 /**
 547  * load - setup chip and create an initial config
 548  * @dev: DRM device
 549  * @flags: startup flags
 550  *
 551  * The driver load routine has to do several things:
 552  *   - initialize the memory manager
 553  *   - allocate initial config memory
 554  *   - setup the DRM framebuffer with the allocated memory
 555  */
 556 static int dev_load(struct drm_device *dev, unsigned long flags)
 557 {
 558         struct omap_drm_private *priv;
 559         int ret;
 560
 561         DBG("load: dev=%p", dev);
 562
 563         drm_device = dev;
 564
 565         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 566         if (!priv) {
 567                 dev_err(dev->dev, "could not allocate priv\n");
 568                 return -ENOMEM;
 569         }
 570
 571         dev->dev_private = priv;
 572
 573         omap_gem_init(dev);
 574
 575         ret = omap_modeset_init(dev);
 576         if (ret) {
 577                 dev_err(dev->dev, "omap_modeset_init failed: ret=%d\n", ret);
 578                 dev->dev_private = NULL;
 579                 kfree(priv);
 580                 return ret;
 581         }
 582
 583         priv->fbdev = omap_fbdev_init(dev);
 584         if (!priv->fbdev) {
 585                 dev_warn(dev->dev, "omap_fbdev_init failed\n");
 586                 /* well, limp along without an fbdev.. maybe X11 will work? */
 587         }
 588
 589         drm_kms_helper_poll_init(dev);
 590
 591         ret = drm_vblank_init(dev, priv->num_crtcs);
 592         if (ret) {
 593                 dev_warn(dev->dev, "could not init vblank\n");
 594         }
 595
 596         return 0;
 597 }
 598
 599 static int dev_unload(struct drm_device *dev)
 600 {
 601         DBG("unload: dev=%p", dev);
 602
 603         drm_vblank_cleanup(dev);
 604         drm_kms_helper_poll_fini(dev);
 605
 606         omap_fbdev_free(dev);
 607         omap_modeset_free(dev);
 608         omap_gem_deinit(dev);
 609
 610         kfree(dev->dev_private);
 611         dev->dev_private = NULL;
 612
 613         return 0;
 614 }
 615
 616 static int dev_open(struct drm_device *dev, struct drm_file *file)
 617 {
 618         file->driver_priv = NULL;
 619
 620         DBG("open: dev=%p, file=%p", dev, file);
 621
 622         return 0;
 623 }
 624
 625 static int dev_firstopen(struct drm_device *dev)
 626 {
 627         DBG("firstopen: dev=%p", dev);
 628         return 0;
 629 }
 630
 631 /**
 632  * lastclose - clean up after all DRM clients have exited
 633  * @dev: DRM device
 634  *
 635  * Take care of cleaning up after all DRM clients have exited.  In the
 636  * mode setting case, we want to restore the kernel's initial mode (just
 637  * in case the last client left us in a bad state).
 638  */
 639 static void dev_lastclose(struct drm_device *dev)
 640 {
 641         /* we don't support vga-switcheroo.. so just make sure the fbdev
 642          * mode is active
 643          */
 644         struct omap_drm_private *priv = dev->dev_private;
 645         int ret;
 646
 647         DBG("lastclose: dev=%p", dev);
 648
 649         ret = drm_fb_helper_restore_fbdev_mode(priv->fbdev);
 650         if (ret)
 651                 DBG("failed to restore crtc mode");
 652 }
 653
 654 static void dev_preclose(struct drm_device *dev, struct drm_file *file)
 655 {
 656         DBG("preclose: dev=%p", dev);
 657 }
 658
 659 static void dev_postclose(struct drm_device *dev, struct drm_file *file)
 660 {
 661         DBG("postclose: dev=%p, file=%p", dev, file);
 662 }
 663
 664 /**
 665  * enable_vblank - enable vblank interrupt events
 666  * @dev: DRM device
 667  * @crtc: which irq to enable
 668  *
 669  * Enable vblank interrupts for @crtc.  If the device doesn't have
 670  * a hardware vblank counter, this routine should be a no-op, since
 671  * interrupts will have to stay on to keep the count accurate.
 672  *
 673  * RETURNS
 674  * Zero on success, appropriate errno if the given @crtc's vblank
 675  * interrupt cannot be enabled.
 676  */
 677 static int dev_enable_vblank(struct drm_device *dev, int crtc)
 678 {
 679         DBG("enable_vblank: dev=%p, crtc=%d", dev, crtc);
 680         return 0;
 681 }
 682
 683 /**
 684  * disable_vblank - disable vblank interrupt events
 685  * @dev: DRM device
 686  * @crtc: which irq to enable
 687  *
 688  * Disable vblank interrupts for @crtc.  If the device doesn't have
 689  * a hardware vblank counter, this routine should be a no-op, since
 690  * interrupts will have to stay on to keep the count accurate.
 691  */
 692 static void dev_disable_vblank(struct drm_device *dev, int crtc)
 693 {
 694         DBG("disable_vblank: dev=%p, crtc=%d", dev, crtc);
 695 }
 696
 697 static irqreturn_t dev_irq_handler(DRM_IRQ_ARGS)
 698 {
 699         return IRQ_HANDLED;
 700 }
 701
 702 static void dev_irq_preinstall(struct drm_device *dev)
 703 {
 704         DBG("irq_preinstall: dev=%p", dev);
 705 }
 706
 707 static int dev_irq_postinstall(struct drm_device *dev)
 708 {
 709         DBG("irq_postinstall: dev=%p", dev);
 710         return 0;
 711 }
 712
 713 static void dev_irq_uninstall(struct drm_device *dev)
 714 {
 715         DBG("irq_uninstall: dev=%p", dev);
 716 }
 717
 718 static struct vm_operations_struct omap_gem_vm_ops = {
 719         .fault = omap_gem_fault,
 720         .open = drm_gem_vm_open,
 721         .close = drm_gem_vm_close,
 722 };
 723
 724 static const struct file_operations omapdriver_fops = {
 725                 .owner = THIS_MODULE,
 726                 .open = drm_open,
 727                 .unlocked_ioctl = drm_ioctl,
 728                 .release = drm_release,
 729                 .mmap = omap_gem_mmap,
 730                 .poll = drm_poll,
 731                 .fasync = drm_fasync,
 732                 .read = drm_read,
 733                 .llseek = noop_llseek,
 734 };
 735
 736 static struct drm_driver omap_drm_driver = {
 737                 .driver_features =
 738                                 DRIVER_HAVE_IRQ | DRIVER_MODESET | DRIVER_GEM,
 739                 .load = dev_load,
 740                 .unload = dev_unload,
 741                 .open = dev_open,
 742                 .firstopen = dev_firstopen,
 743                 .lastclose = dev_lastclose,
 744                 .preclose = dev_preclose,
 745                 .postclose = dev_postclose,
 746                 .get_vblank_counter = drm_vblank_count,
 747                 .enable_vblank = dev_enable_vblank,
 748                 .disable_vblank = dev_disable_vblank,
 749                 .irq_preinstall = dev_irq_preinstall,
 750                 .irq_postinstall = dev_irq_postinstall,
 751                 .irq_uninstall = dev_irq_uninstall,
 752                 .irq_handler = dev_irq_handler,
 753                 .reclaim_buffers = drm_core_reclaim_buffers,
 754 #ifdef CONFIG_DEBUG_FS
 755                 .debugfs_init = omap_debugfs_init,
 756                 .debugfs_cleanup = omap_debugfs_cleanup,
 757 #endif
 758                 .gem_init_object = omap_gem_init_object,
 759                 .gem_free_object = omap_gem_free_object,
 760                 .gem_vm_ops = &omap_gem_vm_ops,
 761                 .dumb_create = omap_gem_dumb_create,
 762                 .dumb_map_offset = omap_gem_dumb_map_offset,
 763                 .dumb_destroy = omap_gem_dumb_destroy,
 764                 .ioctls = ioctls,
 765                 .num_ioctls = DRM_OMAP_NUM_IOCTLS,
 766                 .fops = &omapdriver_fops,
 767                 .name = DRIVER_NAME,
 768                 .desc = DRIVER_DESC,
 769                 .date = DRIVER_DATE,
 770                 .major = DRIVER_MAJOR,
 771                 .minor = DRIVER_MINOR,
 772                 .patchlevel = DRIVER_PATCHLEVEL,
 773 };
 774
 775 static int pdev_suspend(struct platform_device *pDevice, pm_message_t state)
 776 {
 777         DBG("");
 778         return 0;
 779 }
 780
 781 static int pdev_resume(struct platform_device *device)
 782 {
 783         DBG("");
 784         return 0;
 785 }
 786
 787 static void pdev_shutdown(struct platform_device *device)
 788 {
 789         DBG("");
 790 }
 791
 792 static int pdev_probe(struct platform_device *device)
 793 {
 794         DBG("%s", device->name);
 795         return drm_platform_init(&omap_drm_driver, device);
 796 }
 797
 798 static int pdev_remove(struct platform_device *device)
 799 {
 800         DBG("");
 801         drm_platform_exit(&omap_drm_driver, device);
 802         return 0;
 803 }
 804
 805 struct platform_driver pdev = {
 806                 .driver = {
 807                         .name = DRIVER_NAME,
 808                         .owner = THIS_MODULE,
 809                 },
 810                 .probe = pdev_probe,
 811                 .remove = pdev_remove,
 812                 .suspend = pdev_suspend,
 813                 .resume = pdev_resume,
 814                 .shutdown = pdev_shutdown,
 815 };
 816
 817 static int __init omap_drm_init(void)
 818 {
 819         DBG("init");
 820         return platform_driver_register(&pdev);
 821 }
 822
 823 static void __exit omap_drm_fini(void)
 824 {
 825         DBG("fini");
 826         platform_driver_unregister(&pdev);
 827 }
 828
 829 /* need late_initcall() so we load after dss_driver's are loaded */
 830 late_initcall(omap_drm_init);
 831 module_exit(omap_drm_fini);
 832
 833 MODULE_AUTHOR("Rob Clark <rob@ti.com>");
 834 MODULE_DESCRIPTION("OMAP DRM Display Driver");
 835 MODULE_ALIAS("platform:" DRIVER_NAME);
 836 MODULE_LICENSE("GPL v2");