drivers/gpu/drm/tilcdc/tilcdc_drv.c

   1 /*
   2  * Copyright (C) 2012 Texas Instruments
   3  * Author: Rob Clark <robdclark@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 /* LCDC DRM driver, based on da8xx-fb */
  19
  20 #include <linux/component.h>
  21 #include <linux/pinctrl/consumer.h>
  22 #include <linux/suspend.h>
  23 #include <drm/drm_atomic.h>
  24 #include <drm/drm_atomic_helper.h>
  25 #include <drm/drm_fb_helper.h>
  26 #include <drm/drm_gem_framebuffer_helper.h>
  27
  28 #include "tilcdc_drv.h"
  29 #include "tilcdc_regs.h"
  30 #include "tilcdc_tfp410.h"
  31 #include "tilcdc_panel.h"
  32 #include "tilcdc_external.h"
  33
  34 static LIST_HEAD(module_list);
  35
  36 static const u32 tilcdc_rev1_formats[] = { DRM_FORMAT_RGB565 };
  37
  38 static const u32 tilcdc_straight_formats[] = { DRM_FORMAT_RGB565,
  39                                                DRM_FORMAT_BGR888,
  40                                                DRM_FORMAT_XBGR8888 };
  41
  42 static const u32 tilcdc_crossed_formats[] = { DRM_FORMAT_BGR565,
  43                                               DRM_FORMAT_RGB888,
  44                                               DRM_FORMAT_XRGB8888 };
  45
  46 static const u32 tilcdc_legacy_formats[] = { DRM_FORMAT_RGB565,
  47                                              DRM_FORMAT_RGB888,
  48                                              DRM_FORMAT_XRGB8888 };
  49
  50 void tilcdc_module_init(struct tilcdc_module *mod, const char *name,
  51                 const struct tilcdc_module_ops *funcs)
  52 {
  53         mod->name = name;
  54         mod->funcs = funcs;
  55         INIT_LIST_HEAD(&mod->list);
  56         list_add(&mod->list, &module_list);
  57 }
  58
  59 void tilcdc_module_cleanup(struct tilcdc_module *mod)
  60 {
  61         list_del(&mod->list);
  62 }
  63
  64 static struct of_device_id tilcdc_of_match[];
  65
  66 static struct drm_framebuffer *tilcdc_fb_create(struct drm_device *dev,
  67                 struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd)
  68 {
  69         return drm_gem_fb_create(dev, file_priv, mode_cmd);
  70 }
  71
  72 static void tilcdc_fb_output_poll_changed(struct drm_device *dev)
  73 {
  74         struct tilcdc_drm_private *priv = dev->dev_private;
  75         drm_fbdev_cma_hotplug_event(priv->fbdev);
  76 }
  77
  78 static int tilcdc_atomic_check(struct drm_device *dev,
  79                                struct drm_atomic_state *state)
  80 {
  81         int ret;
  82
  83         ret = drm_atomic_helper_check_modeset(dev, state);
  84         if (ret)
  85                 return ret;
  86
  87         ret = drm_atomic_helper_check_planes(dev, state);
  88         if (ret)
  89                 return ret;
  90
  91         /*
  92          * tilcdc ->atomic_check can update ->mode_changed if pixel format
  93          * changes, hence will we check modeset changes again.
  94          */
  95         ret = drm_atomic_helper_check_modeset(dev, state);
  96         if (ret)
  97                 return ret;
  98
  99         return ret;
 100 }
 101
 102 static int tilcdc_commit(struct drm_device *dev,
 103                   struct drm_atomic_state *state,
 104                   bool async)
 105 {
 106         int ret;
 107
 108         ret = drm_atomic_helper_prepare_planes(dev, state);
 109         if (ret)
 110                 return ret;
 111
 112         ret = drm_atomic_helper_swap_state(state, true);
 113         if (ret) {
 114                 drm_atomic_helper_cleanup_planes(dev, state);
 115                 return ret;
 116         }
 117
 118         /*
 119          * Everything below can be run asynchronously without the need to grab
 120          * any modeset locks at all under one condition: It must be guaranteed
 121          * that the asynchronous work has either been cancelled (if the driver
 122          * supports it, which at least requires that the framebuffers get
 123          * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
 124          * before the new state gets committed on the software side with
 125          * drm_atomic_helper_swap_state().
 126          *
 127          * This scheme allows new atomic state updates to be prepared and
 128          * checked in parallel to the asynchronous completion of the previous
 129          * update. Which is important since compositors need to figure out the
 130          * composition of the next frame right after having submitted the
 131          * current layout.
 132          */
 133
 134         drm_atomic_helper_commit_modeset_disables(dev, state);
 135
 136         drm_atomic_helper_commit_planes(dev, state, 0);
 137
 138         drm_atomic_helper_commit_modeset_enables(dev, state);
 139
 140         drm_atomic_helper_wait_for_vblanks(dev, state);
 141
 142         drm_atomic_helper_cleanup_planes(dev, state);
 143
 144         return 0;
 145 }
 146
 147 static const struct drm_mode_config_funcs mode_config_funcs = {
 148         .fb_create = tilcdc_fb_create,
 149         .output_poll_changed = tilcdc_fb_output_poll_changed,
 150         .atomic_check = tilcdc_atomic_check,
 151         .atomic_commit = tilcdc_commit,
 152 };
 153
 154 static void modeset_init(struct drm_device *dev)
 155 {
 156         struct tilcdc_drm_private *priv = dev->dev_private;
 157         struct tilcdc_module *mod;
 158
 159         list_for_each_entry(mod, &module_list, list) {
 160                 DBG("loading module: %s", mod->name);
 161                 mod->funcs->modeset_init(mod, dev);
 162         }
 163
 164         dev->mode_config.min_width = 0;
 165         dev->mode_config.min_height = 0;
 166         dev->mode_config.max_width = tilcdc_crtc_max_width(priv->crtc);
 167         dev->mode_config.max_height = 2048;
 168         dev->mode_config.funcs = &mode_config_funcs;
 169 }
 170
 171 #ifdef CONFIG_CPU_FREQ
 172 static int cpufreq_transition(struct notifier_block *nb,
 173                                      unsigned long val, void *data)
 174 {
 175         struct tilcdc_drm_private *priv = container_of(nb,
 176                         struct tilcdc_drm_private, freq_transition);
 177
 178         if (val == CPUFREQ_POSTCHANGE)
 179                 tilcdc_crtc_update_clk(priv->crtc);
 180
 181         return 0;
 182 }
 183 #endif
 184
 185 /*
 186  * DRM operations:
 187  */
 188
 189 static void tilcdc_fini(struct drm_device *dev)
 190 {
 191         struct tilcdc_drm_private *priv = dev->dev_private;
 192
 193         if (priv->crtc)
 194                 tilcdc_crtc_shutdown(priv->crtc);
 195
 196         if (priv->is_registered)
 197                 drm_dev_unregister(dev);
 198
 199         drm_kms_helper_poll_fini(dev);
 200
 201         if (priv->fbdev)
 202                 drm_fbdev_cma_fini(priv->fbdev);
 203
 204         drm_irq_uninstall(dev);
 205         drm_mode_config_cleanup(dev);
 206         tilcdc_remove_external_device(dev);
 207
 208 #ifdef CONFIG_CPU_FREQ
 209         if (priv->freq_transition.notifier_call)
 210                 cpufreq_unregister_notifier(&priv->freq_transition,
 211                                             CPUFREQ_TRANSITION_NOTIFIER);
 212 #endif
 213
 214         if (priv->clk)
 215                 clk_put(priv->clk);
 216
 217         if (priv->mmio)
 218                 iounmap(priv->mmio);
 219
 220         if (priv->wq) {
 221                 flush_workqueue(priv->wq);
 222                 destroy_workqueue(priv->wq);
 223         }
 224
 225         dev->dev_private = NULL;
 226
 227         pm_runtime_disable(dev->dev);
 228
 229         drm_dev_put(dev);
 230 }
 231
 232 static int tilcdc_init(struct drm_driver *ddrv, struct device *dev)
 233 {
 234         struct drm_device *ddev;
 235         struct platform_device *pdev = to_platform_device(dev);
 236         struct device_node *node = dev->of_node;
 237         struct tilcdc_drm_private *priv;
 238         struct resource *res;
 239         u32 bpp = 0;
 240         int ret;
 241
 242         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 243         if (!priv) {
 244                 dev_err(dev, "failed to allocate private data\n");
 245                 return -ENOMEM;
 246         }
 247
 248         ddev = drm_dev_alloc(ddrv, dev);
 249         if (IS_ERR(ddev))
 250                 return PTR_ERR(ddev);
 251
 252         ddev->dev_private = priv;
 253         platform_set_drvdata(pdev, ddev);
 254         drm_mode_config_init(ddev);
 255
 256         priv->is_componentized =
 257                 tilcdc_get_external_components(dev, NULL) > 0;
 258
 259         priv->wq = alloc_ordered_workqueue("tilcdc", 0);
 260         if (!priv->wq) {
 261                 ret = -ENOMEM;
 262                 goto init_failed;
 263         }
 264
 265         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 266         if (!res) {
 267                 dev_err(dev, "failed to get memory resource\n");
 268                 ret = -EINVAL;
 269                 goto init_failed;
 270         }
 271
 272         priv->mmio = ioremap_nocache(res->start, resource_size(res));
 273         if (!priv->mmio) {
 274                 dev_err(dev, "failed to ioremap\n");
 275                 ret = -ENOMEM;
 276                 goto init_failed;
 277         }
 278
 279         priv->clk = clk_get(dev, "fck");
 280         if (IS_ERR(priv->clk)) {
 281                 dev_err(dev, "failed to get functional clock\n");
 282                 ret = -ENODEV;
 283                 goto init_failed;
 284         }
 285
 286 #ifdef CONFIG_CPU_FREQ
 287         priv->freq_transition.notifier_call = cpufreq_transition;
 288         ret = cpufreq_register_notifier(&priv->freq_transition,
 289                         CPUFREQ_TRANSITION_NOTIFIER);
 290         if (ret) {
 291                 dev_err(dev, "failed to register cpufreq notifier\n");
 292                 priv->freq_transition.notifier_call = NULL;
 293                 goto init_failed;
 294         }
 295 #endif
 296
 297         if (of_property_read_u32(node, "max-bandwidth", &priv->max_bandwidth))
 298                 priv->max_bandwidth = TILCDC_DEFAULT_MAX_BANDWIDTH;
 299
 300         DBG("Maximum Bandwidth Value %d", priv->max_bandwidth);
 301
 302         if (of_property_read_u32(node, "max-width", &priv->max_width))
 303                 priv->max_width = TILCDC_DEFAULT_MAX_WIDTH;
 304
 305         DBG("Maximum Horizontal Pixel Width Value %dpixels", priv->max_width);
 306
 307         if (of_property_read_u32(node, "max-pixelclock",
 308                                         &priv->max_pixelclock))
 309                 priv->max_pixelclock = TILCDC_DEFAULT_MAX_PIXELCLOCK;
 310
 311         DBG("Maximum Pixel Clock Value %dKHz", priv->max_pixelclock);
 312
 313         pm_runtime_enable(dev);
 314
 315         /* Determine LCD IP Version */
 316         pm_runtime_get_sync(dev);
 317         switch (tilcdc_read(ddev, LCDC_PID_REG)) {
 318         case 0x4c100102:
 319                 priv->rev = 1;
 320                 break;
 321         case 0x4f200800:
 322         case 0x4f201000:
 323                 priv->rev = 2;
 324                 break;
 325         default:
 326                 dev_warn(dev, "Unknown PID Reg value 0x%08x, "
 327                         "defaulting to LCD revision 1\n",
 328                         tilcdc_read(ddev, LCDC_PID_REG));
 329                 priv->rev = 1;
 330                 break;
 331         }
 332
 333         pm_runtime_put_sync(dev);
 334
 335         if (priv->rev == 1) {
 336                 DBG("Revision 1 LCDC supports only RGB565 format");
 337                 priv->pixelformats = tilcdc_rev1_formats;
 338                 priv->num_pixelformats = ARRAY_SIZE(tilcdc_rev1_formats);
 339                 bpp = 16;
 340         } else {
 341                 const char *str = "\0";
 342
 343                 of_property_read_string(node, "blue-and-red-wiring", &str);
 344                 if (0 == strcmp(str, "crossed")) {
 345                         DBG("Configured for crossed blue and red wires");
 346                         priv->pixelformats = tilcdc_crossed_formats;
 347                         priv->num_pixelformats =
 348                                 ARRAY_SIZE(tilcdc_crossed_formats);
 349                         bpp = 32; /* Choose bpp with RGB support for fbdef */
 350                 } else if (0 == strcmp(str, "straight")) {
 351                         DBG("Configured for straight blue and red wires");
 352                         priv->pixelformats = tilcdc_straight_formats;
 353                         priv->num_pixelformats =
 354                                 ARRAY_SIZE(tilcdc_straight_formats);
 355                         bpp = 16; /* Choose bpp with RGB support for fbdef */
 356                 } else {
 357                         DBG("Blue and red wiring '%s' unknown, use legacy mode",
 358                             str);
 359                         priv->pixelformats = tilcdc_legacy_formats;
 360                         priv->num_pixelformats =
 361                                 ARRAY_SIZE(tilcdc_legacy_formats);
 362                         bpp = 16; /* This is just a guess */
 363                 }
 364         }
 365
 366         ret = tilcdc_crtc_create(ddev);
 367         if (ret < 0) {
 368                 dev_err(dev, "failed to create crtc\n");
 369                 goto init_failed;
 370         }
 371         modeset_init(ddev);
 372
 373         if (priv->is_componentized) {
 374                 ret = component_bind_all(dev, ddev);
 375                 if (ret < 0)
 376                         goto init_failed;
 377
 378                 ret = tilcdc_add_component_encoder(ddev);
 379                 if (ret < 0)
 380                         goto init_failed;
 381         } else {
 382                 ret = tilcdc_attach_external_device(ddev);
 383                 if (ret)
 384                         goto init_failed;
 385         }
 386
 387         if (!priv->external_connector &&
 388             ((priv->num_encoders == 0) || (priv->num_connectors == 0))) {
 389                 dev_err(dev, "no encoders/connectors found\n");
 390                 ret = -ENXIO;
 391                 goto init_failed;
 392         }
 393
 394         ret = drm_vblank_init(ddev, 1);
 395         if (ret < 0) {
 396                 dev_err(dev, "failed to initialize vblank\n");
 397                 goto init_failed;
 398         }
 399
 400         ret = drm_irq_install(ddev, platform_get_irq(pdev, 0));
 401         if (ret < 0) {
 402                 dev_err(dev, "failed to install IRQ handler\n");
 403                 goto init_failed;
 404         }
 405
 406         drm_mode_config_reset(ddev);
 407
 408         priv->fbdev = drm_fbdev_cma_init(ddev, bpp,
 409                                          ddev->mode_config.num_connector);
 410         if (IS_ERR(priv->fbdev)) {
 411                 ret = PTR_ERR(priv->fbdev);
 412                 goto init_failed;
 413         }
 414
 415         drm_kms_helper_poll_init(ddev);
 416
 417         ret = drm_dev_register(ddev, 0);
 418         if (ret)
 419                 goto init_failed;
 420
 421         priv->is_registered = true;
 422         return 0;
 423
 424 init_failed:
 425         tilcdc_fini(ddev);
 426
 427         return ret;
 428 }
 429
 430 static void tilcdc_lastclose(struct drm_device *dev)
 431 {
 432         struct tilcdc_drm_private *priv = dev->dev_private;
 433         drm_fbdev_cma_restore_mode(priv->fbdev);
 434 }
 435
 436 static irqreturn_t tilcdc_irq(int irq, void *arg)
 437 {
 438         struct drm_device *dev = arg;
 439         struct tilcdc_drm_private *priv = dev->dev_private;
 440         return tilcdc_crtc_irq(priv->crtc);
 441 }
 442
 443 #if defined(CONFIG_DEBUG_FS)
 444 static const struct {
 445         const char *name;
 446         uint8_t  rev;
 447         uint8_t  save;
 448         uint32_t reg;
 449 } registers[] =         {
 450 #define REG(rev, save, reg) { #reg, rev, save, reg }
 451                 /* exists in revision 1: */
 452                 REG(1, false, LCDC_PID_REG),
 453                 REG(1, true,  LCDC_CTRL_REG),
 454                 REG(1, false, LCDC_STAT_REG),
 455                 REG(1, true,  LCDC_RASTER_CTRL_REG),
 456                 REG(1, true,  LCDC_RASTER_TIMING_0_REG),
 457                 REG(1, true,  LCDC_RASTER_TIMING_1_REG),
 458                 REG(1, true,  LCDC_RASTER_TIMING_2_REG),
 459                 REG(1, true,  LCDC_DMA_CTRL_REG),
 460                 REG(1, true,  LCDC_DMA_FB_BASE_ADDR_0_REG),
 461                 REG(1, true,  LCDC_DMA_FB_CEILING_ADDR_0_REG),
 462                 REG(1, true,  LCDC_DMA_FB_BASE_ADDR_1_REG),
 463                 REG(1, true,  LCDC_DMA_FB_CEILING_ADDR_1_REG),
 464                 /* new in revision 2: */
 465                 REG(2, false, LCDC_RAW_STAT_REG),
 466                 REG(2, false, LCDC_MASKED_STAT_REG),
 467                 REG(2, true, LCDC_INT_ENABLE_SET_REG),
 468                 REG(2, false, LCDC_INT_ENABLE_CLR_REG),
 469                 REG(2, false, LCDC_END_OF_INT_IND_REG),
 470                 REG(2, true,  LCDC_CLK_ENABLE_REG),
 471 #undef REG
 472 };
 473
 474 #endif
 475
 476 #ifdef CONFIG_DEBUG_FS
 477 static int tilcdc_regs_show(struct seq_file *m, void *arg)
 478 {
 479         struct drm_info_node *node = (struct drm_info_node *) m->private;
 480         struct drm_device *dev = node->minor->dev;
 481         struct tilcdc_drm_private *priv = dev->dev_private;
 482         unsigned i;
 483
 484         pm_runtime_get_sync(dev->dev);
 485
 486         seq_printf(m, "revision: %d\n", priv->rev);
 487
 488         for (i = 0; i < ARRAY_SIZE(registers); i++)
 489                 if (priv->rev >= registers[i].rev)
 490                         seq_printf(m, "%s:\t %08x\n", registers[i].name,
 491                                         tilcdc_read(dev, registers[i].reg));
 492
 493         pm_runtime_put_sync(dev->dev);
 494
 495         return 0;
 496 }
 497
 498 static int tilcdc_mm_show(struct seq_file *m, void *arg)
 499 {
 500         struct drm_info_node *node = (struct drm_info_node *) m->private;
 501         struct drm_device *dev = node->minor->dev;
 502         struct drm_printer p = drm_seq_file_printer(m);
 503         drm_mm_print(&dev->vma_offset_manager->vm_addr_space_mm, &p);
 504         return 0;
 505 }
 506
 507 static struct drm_info_list tilcdc_debugfs_list[] = {
 508                 { "regs", tilcdc_regs_show, 0 },
 509                 { "mm",   tilcdc_mm_show,   0 },
 510                 { "fb",   drm_fb_cma_debugfs_show, 0 },
 511 };
 512
 513 static int tilcdc_debugfs_init(struct drm_minor *minor)
 514 {
 515         struct drm_device *dev = minor->dev;
 516         struct tilcdc_module *mod;
 517         int ret;
 518
 519         ret = drm_debugfs_create_files(tilcdc_debugfs_list,
 520                         ARRAY_SIZE(tilcdc_debugfs_list),
 521                         minor->debugfs_root, minor);
 522
 523         list_for_each_entry(mod, &module_list, list)
 524                 if (mod->funcs->debugfs_init)
 525                         mod->funcs->debugfs_init(mod, minor);
 526
 527         if (ret) {
 528                 dev_err(dev->dev, "could not install tilcdc_debugfs_list\n");
 529                 return ret;
 530         }
 531
 532         return ret;
 533 }
 534 #endif
 535
 536 DEFINE_DRM_GEM_CMA_FOPS(fops);
 537
 538 static struct drm_driver tilcdc_driver = {
 539         .driver_features    = (DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET |
 540                                DRIVER_PRIME | DRIVER_ATOMIC),
 541         .lastclose          = tilcdc_lastclose,
 542         .irq_handler        = tilcdc_irq,
 543         .gem_free_object_unlocked = drm_gem_cma_free_object,
 544         .gem_vm_ops         = &drm_gem_cma_vm_ops,
 545         .dumb_create        = drm_gem_cma_dumb_create,
 546
 547         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 548         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 549         .gem_prime_import       = drm_gem_prime_import,
 550         .gem_prime_export       = drm_gem_prime_export,
 551         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 552         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 553         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 554         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 555         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 556 #ifdef CONFIG_DEBUG_FS
 557         .debugfs_init       = tilcdc_debugfs_init,
 558 #endif
 559         .fops               = &fops,
 560         .name               = "tilcdc",
 561         .desc               = "TI LCD Controller DRM",
 562         .date               = "20121205",
 563         .major              = 1,
 564         .minor              = 0,
 565 };
 566
 567 /*
 568  * Power management:
 569  */
 570
 571 #ifdef CONFIG_PM_SLEEP
 572 static int tilcdc_pm_suspend(struct device *dev)
 573 {
 574         struct drm_device *ddev = dev_get_drvdata(dev);
 575         struct tilcdc_drm_private *priv = ddev->dev_private;
 576
 577         priv->saved_state = drm_atomic_helper_suspend(ddev);
 578
 579         /* Select sleep pin state */
 580         pinctrl_pm_select_sleep_state(dev);
 581
 582         return 0;
 583 }
 584
 585 static int tilcdc_pm_resume(struct device *dev)
 586 {
 587         struct drm_device *ddev = dev_get_drvdata(dev);
 588         struct tilcdc_drm_private *priv = ddev->dev_private;
 589         int ret = 0;
 590
 591         /* Select default pin state */
 592         pinctrl_pm_select_default_state(dev);
 593
 594         if (priv->saved_state)
 595                 ret = drm_atomic_helper_resume(ddev, priv->saved_state);
 596
 597         return ret;
 598 }
 599 #endif
 600
 601 static const struct dev_pm_ops tilcdc_pm_ops = {
 602         SET_SYSTEM_SLEEP_PM_OPS(tilcdc_pm_suspend, tilcdc_pm_resume)
 603 };
 604
 605 /*
 606  * Platform driver:
 607  */
 608 static int tilcdc_bind(struct device *dev)
 609 {
 610         return tilcdc_init(&tilcdc_driver, dev);
 611 }
 612
 613 static void tilcdc_unbind(struct device *dev)
 614 {
 615         struct drm_device *ddev = dev_get_drvdata(dev);
 616
 617         /* Check if a subcomponent has already triggered the unloading. */
 618         if (!ddev->dev_private)
 619                 return;
 620
 621         tilcdc_fini(dev_get_drvdata(dev));
 622 }
 623
 624 static const struct component_master_ops tilcdc_comp_ops = {
 625         .bind = tilcdc_bind,
 626         .unbind = tilcdc_unbind,
 627 };
 628
 629 static int tilcdc_pdev_probe(struct platform_device *pdev)
 630 {
 631         struct component_match *match = NULL;
 632         int ret;
 633
 634         /* bail out early if no DT data: */
 635         if (!pdev->dev.of_node) {
 636                 dev_err(&pdev->dev, "device-tree data is missing\n");
 637                 return -ENXIO;
 638         }
 639
 640         ret = tilcdc_get_external_components(&pdev->dev, &match);
 641         if (ret < 0)
 642                 return ret;
 643         else if (ret == 0)
 644                 return tilcdc_init(&tilcdc_driver, &pdev->dev);
 645         else
 646                 return component_master_add_with_match(&pdev->dev,
 647                                                        &tilcdc_comp_ops,
 648                                                        match);
 649 }
 650
 651 static int tilcdc_pdev_remove(struct platform_device *pdev)
 652 {
 653         int ret;
 654
 655         ret = tilcdc_get_external_components(&pdev->dev, NULL);
 656         if (ret < 0)
 657                 return ret;
 658         else if (ret == 0)
 659                 tilcdc_fini(platform_get_drvdata(pdev));
 660         else
 661                 component_master_del(&pdev->dev, &tilcdc_comp_ops);
 662
 663         return 0;
 664 }
 665
 666 static struct of_device_id tilcdc_of_match[] = {
 667                 { .compatible = "ti,am33xx-tilcdc", },
 668                 { .compatible = "ti,da850-tilcdc", },
 669                 { },
 670 };
 671 MODULE_DEVICE_TABLE(of, tilcdc_of_match);
 672
 673 static struct platform_driver tilcdc_platform_driver = {
 674         .probe      = tilcdc_pdev_probe,
 675         .remove     = tilcdc_pdev_remove,
 676         .driver     = {
 677                 .name   = "tilcdc",
 678                 .pm     = &tilcdc_pm_ops,
 679                 .of_match_table = tilcdc_of_match,
 680         },
 681 };
 682
 683 static int __init tilcdc_drm_init(void)
 684 {
 685         DBG("init");
 686         tilcdc_tfp410_init();
 687         tilcdc_panel_init();
 688         return platform_driver_register(&tilcdc_platform_driver);
 689 }
 690
 691 static void __exit tilcdc_drm_fini(void)
 692 {
 693         DBG("fini");
 694         platform_driver_unregister(&tilcdc_platform_driver);
 695         tilcdc_panel_fini();
 696         tilcdc_tfp410_fini();
 697 }
 698
 699 module_init(tilcdc_drm_init);
 700 module_exit(tilcdc_drm_fini);
 701
 702 MODULE_AUTHOR("Rob Clark <robdclark@gmail.com");
 703 MODULE_DESCRIPTION("TI LCD Controller DRM Driver");
 704 MODULE_LICENSE("GPL");