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 "tilcdc_drv.h"
  21 #include "tilcdc_regs.h"
  22 #include "tilcdc_tfp410.h"
  23 #include "tilcdc_slave.h"
  24 #include "tilcdc_panel.h"
  25
  26 #include "drm_fb_helper.h"
  27
  28 static LIST_HEAD(module_list);
  29 static bool slave_probing;
  30
  31 void tilcdc_module_init(struct tilcdc_module *mod, const char *name,
  32                 const struct tilcdc_module_ops *funcs)
  33 {
  34         mod->name = name;
  35         mod->funcs = funcs;
  36         INIT_LIST_HEAD(&mod->list);
  37         list_add(&mod->list, &module_list);
  38 }
  39
  40 void tilcdc_module_cleanup(struct tilcdc_module *mod)
  41 {
  42         list_del(&mod->list);
  43 }
  44
  45 void tilcdc_slave_probedefer(bool defered)
  46 {
  47         slave_probing = defered;
  48 }
  49
  50 static struct of_device_id tilcdc_of_match[];
  51
  52 static struct drm_framebuffer *tilcdc_fb_create(struct drm_device *dev,
  53                 struct drm_file *file_priv, struct drm_mode_fb_cmd2 *mode_cmd)
  54 {
  55         return drm_fb_cma_create(dev, file_priv, mode_cmd);
  56 }
  57
  58 static void tilcdc_fb_output_poll_changed(struct drm_device *dev)
  59 {
  60         struct tilcdc_drm_private *priv = dev->dev_private;
  61         drm_fbdev_cma_hotplug_event(priv->fbdev);
  62 }
  63
  64 static const struct drm_mode_config_funcs mode_config_funcs = {
  65         .fb_create = tilcdc_fb_create,
  66         .output_poll_changed = tilcdc_fb_output_poll_changed,
  67 };
  68
  69 static int modeset_init(struct drm_device *dev)
  70 {
  71         struct tilcdc_drm_private *priv = dev->dev_private;
  72         struct tilcdc_module *mod;
  73
  74         drm_mode_config_init(dev);
  75
  76         priv->crtc = tilcdc_crtc_create(dev);
  77
  78         list_for_each_entry(mod, &module_list, list) {
  79                 DBG("loading module: %s", mod->name);
  80                 mod->funcs->modeset_init(mod, dev);
  81         }
  82
  83         if ((priv->num_encoders == 0) || (priv->num_connectors == 0)) {
  84                 /* oh nos! */
  85                 dev_err(dev->dev, "no encoders/connectors found\n");
  86                 drm_mode_config_cleanup(dev);
  87                 return -ENXIO;
  88         }
  89
  90         dev->mode_config.min_width = 0;
  91         dev->mode_config.min_height = 0;
  92         dev->mode_config.max_width = tilcdc_crtc_max_width(priv->crtc);
  93         dev->mode_config.max_height = 2048;
  94         dev->mode_config.funcs = &mode_config_funcs;
  95
  96         return 0;
  97 }
  98
  99 #ifdef CONFIG_CPU_FREQ
 100 static int cpufreq_transition(struct notifier_block *nb,
 101                                      unsigned long val, void *data)
 102 {
 103         struct tilcdc_drm_private *priv = container_of(nb,
 104                         struct tilcdc_drm_private, freq_transition);
 105         if (val == CPUFREQ_POSTCHANGE) {
 106                 if (priv->lcd_fck_rate != clk_get_rate(priv->clk)) {
 107                         priv->lcd_fck_rate = clk_get_rate(priv->clk);
 108                         tilcdc_crtc_update_clk(priv->crtc);
 109                 }
 110         }
 111
 112         return 0;
 113 }
 114 #endif
 115
 116 /*
 117  * DRM operations:
 118  */
 119
 120 static int tilcdc_unload(struct drm_device *dev)
 121 {
 122         struct tilcdc_drm_private *priv = dev->dev_private;
 123
 124         drm_fbdev_cma_fini(priv->fbdev);
 125         drm_kms_helper_poll_fini(dev);
 126         drm_mode_config_cleanup(dev);
 127         drm_vblank_cleanup(dev);
 128
 129         pm_runtime_get_sync(dev->dev);
 130         drm_irq_uninstall(dev);
 131         pm_runtime_put_sync(dev->dev);
 132
 133 #ifdef CONFIG_CPU_FREQ
 134         cpufreq_unregister_notifier(&priv->freq_transition,
 135                         CPUFREQ_TRANSITION_NOTIFIER);
 136 #endif
 137
 138         if (priv->clk)
 139                 clk_put(priv->clk);
 140
 141         if (priv->mmio)
 142                 iounmap(priv->mmio);
 143
 144         flush_workqueue(priv->wq);
 145         destroy_workqueue(priv->wq);
 146
 147         dev->dev_private = NULL;
 148
 149         pm_runtime_disable(dev->dev);
 150
 151         kfree(priv);
 152
 153         return 0;
 154 }
 155
 156 static int tilcdc_load(struct drm_device *dev, unsigned long flags)
 157 {
 158         struct platform_device *pdev = dev->platformdev;
 159         struct device_node *node = pdev->dev.of_node;
 160         struct tilcdc_drm_private *priv;
 161         struct tilcdc_module *mod;
 162         struct resource *res;
 163         u32 bpp = 0;
 164         int ret;
 165
 166         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 167         if (!priv) {
 168                 dev_err(dev->dev, "failed to allocate private data\n");
 169                 return -ENOMEM;
 170         }
 171
 172         dev->dev_private = priv;
 173
 174         priv->wq = alloc_ordered_workqueue("tilcdc", 0);
 175         if (!priv->wq) {
 176                 ret = -ENOMEM;
 177                 goto fail_free_priv;
 178         }
 179
 180         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 181         if (!res) {
 182                 dev_err(dev->dev, "failed to get memory resource\n");
 183                 ret = -EINVAL;
 184                 goto fail_free_wq;
 185         }
 186
 187         priv->mmio = ioremap_nocache(res->start, resource_size(res));
 188         if (!priv->mmio) {
 189                 dev_err(dev->dev, "failed to ioremap\n");
 190                 ret = -ENOMEM;
 191                 goto fail_free_wq;
 192         }
 193
 194         priv->clk = clk_get(dev->dev, "fck");
 195         if (IS_ERR(priv->clk)) {
 196                 dev_err(dev->dev, "failed to get functional clock\n");
 197                 ret = -ENODEV;
 198                 goto fail_iounmap;
 199         }
 200
 201         priv->disp_clk = clk_get(dev->dev, "dpll_disp_ck");
 202         if (IS_ERR(priv->clk)) {
 203                 dev_err(dev->dev, "failed to get display clock\n");
 204                 ret = -ENODEV;
 205                 goto fail_put_clk;
 206         }
 207
 208 #ifdef CONFIG_CPU_FREQ
 209         priv->lcd_fck_rate = clk_get_rate(priv->clk);
 210         priv->freq_transition.notifier_call = cpufreq_transition;
 211         ret = cpufreq_register_notifier(&priv->freq_transition,
 212                         CPUFREQ_TRANSITION_NOTIFIER);
 213         if (ret) {
 214                 dev_err(dev->dev, "failed to register cpufreq notifier\n");
 215                 goto fail_put_disp_clk;
 216         }
 217 #endif
 218
 219         if (of_property_read_u32(node, "max-bandwidth", &priv->max_bandwidth))
 220                 priv->max_bandwidth = TILCDC_DEFAULT_MAX_BANDWIDTH;
 221
 222         DBG("Maximum Bandwidth Value %d", priv->max_bandwidth);
 223
 224         if (of_property_read_u32(node, "ti,max-width", &priv->max_width))
 225                 priv->max_width = TILCDC_DEFAULT_MAX_WIDTH;
 226
 227         DBG("Maximum Horizontal Pixel Width Value %dpixels", priv->max_width);
 228
 229         if (of_property_read_u32(node, "ti,max-pixelclock",
 230                                         &priv->max_pixelclock))
 231                 priv->max_pixelclock = TILCDC_DEFAULT_MAX_PIXELCLOCK;
 232
 233         DBG("Maximum Pixel Clock Value %dKHz", priv->max_pixelclock);
 234
 235         pm_runtime_enable(dev->dev);
 236
 237         /* Determine LCD IP Version */
 238         pm_runtime_get_sync(dev->dev);
 239         switch (tilcdc_read(dev, LCDC_PID_REG)) {
 240         case 0x4c100102:
 241                 priv->rev = 1;
 242                 break;
 243         case 0x4f200800:
 244         case 0x4f201000:
 245                 priv->rev = 2;
 246                 break;
 247         default:
 248                 dev_warn(dev->dev, "Unknown PID Reg value 0x%08x, "
 249                                 "defaulting to LCD revision 1\n",
 250                                 tilcdc_read(dev, LCDC_PID_REG));
 251                 priv->rev = 1;
 252                 break;
 253         }
 254
 255         pm_runtime_put_sync(dev->dev);
 256
 257         ret = modeset_init(dev);
 258         if (ret < 0) {
 259                 dev_err(dev->dev, "failed to initialize mode setting\n");
 260                 goto fail_cpufreq_unregister;
 261         }
 262
 263         ret = drm_vblank_init(dev, 1);
 264         if (ret < 0) {
 265                 dev_err(dev->dev, "failed to initialize vblank\n");
 266                 goto fail_mode_config_cleanup;
 267         }
 268
 269         pm_runtime_get_sync(dev->dev);
 270         ret = drm_irq_install(dev, platform_get_irq(dev->platformdev, 0));
 271         pm_runtime_put_sync(dev->dev);
 272         if (ret < 0) {
 273                 dev_err(dev->dev, "failed to install IRQ handler\n");
 274                 goto fail_vblank_cleanup;
 275         }
 276
 277         platform_set_drvdata(pdev, dev);
 278
 279
 280         list_for_each_entry(mod, &module_list, list) {
 281                 DBG("%s: preferred_bpp: %d", mod->name, mod->preferred_bpp);
 282                 bpp = mod->preferred_bpp;
 283                 if (bpp > 0)
 284                         break;
 285         }
 286
 287         priv->fbdev = drm_fbdev_cma_init(dev, bpp,
 288                         dev->mode_config.num_crtc,
 289                         dev->mode_config.num_connector);
 290         if (IS_ERR(priv->fbdev)) {
 291                 ret = PTR_ERR(priv->fbdev);
 292                 goto fail_irq_uninstall;
 293         }
 294
 295         drm_kms_helper_poll_init(dev);
 296
 297         return 0;
 298
 299 fail_irq_uninstall:
 300         pm_runtime_get_sync(dev->dev);
 301         drm_irq_uninstall(dev);
 302         pm_runtime_put_sync(dev->dev);
 303
 304 fail_vblank_cleanup:
 305         drm_vblank_cleanup(dev);
 306
 307 fail_mode_config_cleanup:
 308         drm_mode_config_cleanup(dev);
 309
 310 fail_cpufreq_unregister:
 311         pm_runtime_disable(dev->dev);
 312 #ifdef CONFIG_CPU_FREQ
 313         cpufreq_unregister_notifier(&priv->freq_transition,
 314                         CPUFREQ_TRANSITION_NOTIFIER);
 315 fail_put_disp_clk:
 316         clk_put(priv->disp_clk);
 317 #endif
 318
 319 fail_put_clk:
 320         clk_put(priv->clk);
 321
 322 fail_iounmap:
 323         iounmap(priv->mmio);
 324
 325 fail_free_wq:
 326         flush_workqueue(priv->wq);
 327         destroy_workqueue(priv->wq);
 328
 329 fail_free_priv:
 330         dev->dev_private = NULL;
 331         kfree(priv);
 332         return ret;
 333 }
 334
 335 static void tilcdc_preclose(struct drm_device *dev, struct drm_file *file)
 336 {
 337         struct tilcdc_drm_private *priv = dev->dev_private;
 338
 339         tilcdc_crtc_cancel_page_flip(priv->crtc, file);
 340 }
 341
 342 static void tilcdc_lastclose(struct drm_device *dev)
 343 {
 344         struct tilcdc_drm_private *priv = dev->dev_private;
 345         drm_fbdev_cma_restore_mode(priv->fbdev);
 346 }
 347
 348 static irqreturn_t tilcdc_irq(int irq, void *arg)
 349 {
 350         struct drm_device *dev = arg;
 351         struct tilcdc_drm_private *priv = dev->dev_private;
 352         return tilcdc_crtc_irq(priv->crtc);
 353 }
 354
 355 static void tilcdc_irq_preinstall(struct drm_device *dev)
 356 {
 357         tilcdc_clear_irqstatus(dev, 0xffffffff);
 358 }
 359
 360 static int tilcdc_irq_postinstall(struct drm_device *dev)
 361 {
 362         struct tilcdc_drm_private *priv = dev->dev_private;
 363
 364         /* enable FIFO underflow irq: */
 365         if (priv->rev == 1)
 366                 tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_V1_UNDERFLOW_INT_ENA);
 367         else
 368                 tilcdc_set(dev, LCDC_INT_ENABLE_SET_REG, LCDC_V2_UNDERFLOW_INT_ENA);
 369
 370         return 0;
 371 }
 372
 373 static void tilcdc_irq_uninstall(struct drm_device *dev)
 374 {
 375         struct tilcdc_drm_private *priv = dev->dev_private;
 376
 377         /* disable irqs that we might have enabled: */
 378         if (priv->rev == 1) {
 379                 tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
 380                                 LCDC_V1_UNDERFLOW_INT_ENA | LCDC_V1_PL_INT_ENA);
 381                 tilcdc_clear(dev, LCDC_DMA_CTRL_REG, LCDC_V1_END_OF_FRAME_INT_ENA);
 382         } else {
 383                 tilcdc_clear(dev, LCDC_INT_ENABLE_SET_REG,
 384                         LCDC_V2_UNDERFLOW_INT_ENA | LCDC_V2_PL_INT_ENA |
 385                         LCDC_V2_END_OF_FRAME0_INT_ENA | LCDC_V2_END_OF_FRAME1_INT_ENA |
 386                         LCDC_FRAME_DONE);
 387         }
 388
 389 }
 390
 391 static void enable_vblank(struct drm_device *dev, bool enable)
 392 {
 393         struct tilcdc_drm_private *priv = dev->dev_private;
 394         u32 reg, mask;
 395
 396         if (priv->rev == 1) {
 397                 reg = LCDC_DMA_CTRL_REG;
 398                 mask = LCDC_V1_END_OF_FRAME_INT_ENA;
 399         } else {
 400                 reg = LCDC_INT_ENABLE_SET_REG;
 401                 mask = LCDC_V2_END_OF_FRAME0_INT_ENA |
 402                         LCDC_V2_END_OF_FRAME1_INT_ENA | LCDC_FRAME_DONE;
 403         }
 404
 405         if (enable)
 406                 tilcdc_set(dev, reg, mask);
 407         else
 408                 tilcdc_clear(dev, reg, mask);
 409 }
 410
 411 static int tilcdc_enable_vblank(struct drm_device *dev, int crtc)
 412 {
 413         enable_vblank(dev, true);
 414         return 0;
 415 }
 416
 417 static void tilcdc_disable_vblank(struct drm_device *dev, int crtc)
 418 {
 419         enable_vblank(dev, false);
 420 }
 421
 422 #if defined(CONFIG_DEBUG_FS) || defined(CONFIG_PM_SLEEP)
 423 static const struct {
 424         const char *name;
 425         uint8_t  rev;
 426         uint8_t  save;
 427         uint32_t reg;
 428 } registers[] =         {
 429 #define REG(rev, save, reg) { #reg, rev, save, reg }
 430                 /* exists in revision 1: */
 431                 REG(1, false, LCDC_PID_REG),
 432                 REG(1, true,  LCDC_CTRL_REG),
 433                 REG(1, false, LCDC_STAT_REG),
 434                 REG(1, true,  LCDC_RASTER_CTRL_REG),
 435                 REG(1, true,  LCDC_RASTER_TIMING_0_REG),
 436                 REG(1, true,  LCDC_RASTER_TIMING_1_REG),
 437                 REG(1, true,  LCDC_RASTER_TIMING_2_REG),
 438                 REG(1, true,  LCDC_DMA_CTRL_REG),
 439                 REG(1, true,  LCDC_DMA_FB_BASE_ADDR_0_REG),
 440                 REG(1, true,  LCDC_DMA_FB_CEILING_ADDR_0_REG),
 441                 REG(1, true,  LCDC_DMA_FB_BASE_ADDR_1_REG),
 442                 REG(1, true,  LCDC_DMA_FB_CEILING_ADDR_1_REG),
 443                 /* new in revision 2: */
 444                 REG(2, false, LCDC_RAW_STAT_REG),
 445                 REG(2, false, LCDC_MASKED_STAT_REG),
 446                 REG(2, false, LCDC_INT_ENABLE_SET_REG),
 447                 REG(2, false, LCDC_INT_ENABLE_CLR_REG),
 448                 REG(2, false, LCDC_END_OF_INT_IND_REG),
 449                 REG(2, true,  LCDC_CLK_ENABLE_REG),
 450                 REG(2, true,  LCDC_INT_ENABLE_SET_REG),
 451 #undef REG
 452 };
 453 #endif
 454
 455 #ifdef CONFIG_DEBUG_FS
 456 static int tilcdc_regs_show(struct seq_file *m, void *arg)
 457 {
 458         struct drm_info_node *node = (struct drm_info_node *) m->private;
 459         struct drm_device *dev = node->minor->dev;
 460         struct tilcdc_drm_private *priv = dev->dev_private;
 461         unsigned i;
 462
 463         pm_runtime_get_sync(dev->dev);
 464
 465         seq_printf(m, "revision: %d\n", priv->rev);
 466
 467         for (i = 0; i < ARRAY_SIZE(registers); i++)
 468                 if (priv->rev >= registers[i].rev)
 469                         seq_printf(m, "%s:\t %08x\n", registers[i].name,
 470                                         tilcdc_read(dev, registers[i].reg));
 471
 472         pm_runtime_put_sync(dev->dev);
 473
 474         return 0;
 475 }
 476
 477 static int tilcdc_mm_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         return drm_mm_dump_table(m, &dev->vma_offset_manager->vm_addr_space_mm);
 482 }
 483
 484 static struct drm_info_list tilcdc_debugfs_list[] = {
 485                 { "regs", tilcdc_regs_show, 0 },
 486                 { "mm",   tilcdc_mm_show,   0 },
 487                 { "fb",   drm_fb_cma_debugfs_show, 0 },
 488 };
 489
 490 static int tilcdc_debugfs_init(struct drm_minor *minor)
 491 {
 492         struct drm_device *dev = minor->dev;
 493         struct tilcdc_module *mod;
 494         int ret;
 495
 496         ret = drm_debugfs_create_files(tilcdc_debugfs_list,
 497                         ARRAY_SIZE(tilcdc_debugfs_list),
 498                         minor->debugfs_root, minor);
 499
 500         list_for_each_entry(mod, &module_list, list)
 501                 if (mod->funcs->debugfs_init)
 502                         mod->funcs->debugfs_init(mod, minor);
 503
 504         if (ret) {
 505                 dev_err(dev->dev, "could not install tilcdc_debugfs_list\n");
 506                 return ret;
 507         }
 508
 509         return ret;
 510 }
 511
 512 static void tilcdc_debugfs_cleanup(struct drm_minor *minor)
 513 {
 514         struct tilcdc_module *mod;
 515         drm_debugfs_remove_files(tilcdc_debugfs_list,
 516                         ARRAY_SIZE(tilcdc_debugfs_list), minor);
 517
 518         list_for_each_entry(mod, &module_list, list)
 519                 if (mod->funcs->debugfs_cleanup)
 520                         mod->funcs->debugfs_cleanup(mod, minor);
 521 }
 522 #endif
 523
 524 static const struct file_operations fops = {
 525         .owner              = THIS_MODULE,
 526         .open               = drm_open,
 527         .release            = drm_release,
 528         .unlocked_ioctl     = drm_ioctl,
 529 #ifdef CONFIG_COMPAT
 530         .compat_ioctl       = drm_compat_ioctl,
 531 #endif
 532         .poll               = drm_poll,
 533         .read               = drm_read,
 534         .llseek             = no_llseek,
 535         .mmap               = drm_gem_cma_mmap,
 536 };
 537
 538 static struct drm_driver tilcdc_driver = {
 539         .driver_features    = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET,
 540         .load               = tilcdc_load,
 541         .unload             = tilcdc_unload,
 542         .preclose           = tilcdc_preclose,
 543         .lastclose          = tilcdc_lastclose,
 544         .set_busid          = drm_platform_set_busid,
 545         .irq_handler        = tilcdc_irq,
 546         .irq_preinstall     = tilcdc_irq_preinstall,
 547         .irq_postinstall    = tilcdc_irq_postinstall,
 548         .irq_uninstall      = tilcdc_irq_uninstall,
 549         .get_vblank_counter = drm_vblank_count,
 550         .enable_vblank      = tilcdc_enable_vblank,
 551         .disable_vblank     = tilcdc_disable_vblank,
 552         .gem_free_object    = drm_gem_cma_free_object,
 553         .gem_vm_ops         = &drm_gem_cma_vm_ops,
 554         .dumb_create        = drm_gem_cma_dumb_create,
 555         .dumb_map_offset    = drm_gem_cma_dumb_map_offset,
 556         .dumb_destroy       = drm_gem_dumb_destroy,
 557 #ifdef CONFIG_DEBUG_FS
 558         .debugfs_init       = tilcdc_debugfs_init,
 559         .debugfs_cleanup    = tilcdc_debugfs_cleanup,
 560 #endif
 561         .fops               = &fops,
 562         .name               = "tilcdc",
 563         .desc               = "TI LCD Controller DRM",
 564         .date               = "20121205",
 565         .major              = 1,
 566         .minor              = 0,
 567 };
 568
 569 /*
 570  * Power management:
 571  */
 572
 573 #ifdef CONFIG_PM_SLEEP
 574 static int tilcdc_pm_suspend(struct device *dev)
 575 {
 576         struct drm_device *ddev = dev_get_drvdata(dev);
 577         struct tilcdc_drm_private *priv = ddev->dev_private;
 578         unsigned i, n = 0;
 579
 580         drm_kms_helper_poll_disable(ddev);
 581
 582         /* Save register state: */
 583         for (i = 0; i < ARRAY_SIZE(registers); i++)
 584                 if (registers[i].save && (priv->rev >= registers[i].rev))
 585                         priv->saved_register[n++] = tilcdc_read(ddev, registers[i].reg);
 586
 587         return 0;
 588 }
 589
 590 static int tilcdc_pm_resume(struct device *dev)
 591 {
 592         struct drm_device *ddev = dev_get_drvdata(dev);
 593         struct tilcdc_drm_private *priv = ddev->dev_private;
 594         unsigned i, n = 0;
 595
 596         /* Restore register state: */
 597         for (i = 0; i < ARRAY_SIZE(registers); i++)
 598                 if (registers[i].save && (priv->rev >= registers[i].rev))
 599                         tilcdc_write(ddev, registers[i].reg, priv->saved_register[n++]);
 600
 601         drm_kms_helper_poll_enable(ddev);
 602
 603         return 0;
 604 }
 605 #endif
 606
 607 static const struct dev_pm_ops tilcdc_pm_ops = {
 608         SET_SYSTEM_SLEEP_PM_OPS(tilcdc_pm_suspend, tilcdc_pm_resume)
 609 };
 610
 611 /*
 612  * Platform driver:
 613  */
 614
 615 static int tilcdc_pdev_probe(struct platform_device *pdev)
 616 {
 617         /* bail out early if no DT data: */
 618         if (!pdev->dev.of_node) {
 619                 dev_err(&pdev->dev, "device-tree data is missing\n");
 620                 return -ENXIO;
 621         }
 622
 623         /* defer probing if slave is in deferred probing */
 624         if (slave_probing == true)
 625                 return -EPROBE_DEFER;
 626
 627         return drm_platform_init(&tilcdc_driver, pdev);
 628 }
 629
 630 static int tilcdc_pdev_remove(struct platform_device *pdev)
 631 {
 632         drm_put_dev(platform_get_drvdata(pdev));
 633
 634         return 0;
 635 }
 636
 637 static struct of_device_id tilcdc_of_match[] = {
 638                 { .compatible = "ti,am33xx-tilcdc", },
 639                 { },
 640 };
 641 MODULE_DEVICE_TABLE(of, tilcdc_of_match);
 642
 643 static struct platform_driver tilcdc_platform_driver = {
 644         .probe      = tilcdc_pdev_probe,
 645         .remove     = tilcdc_pdev_remove,
 646         .driver     = {
 647                 .name   = "tilcdc",
 648                 .pm     = &tilcdc_pm_ops,
 649                 .of_match_table = tilcdc_of_match,
 650         },
 651 };
 652
 653 static int __init tilcdc_drm_init(void)
 654 {
 655         DBG("init");
 656         tilcdc_tfp410_init();
 657         tilcdc_slave_init();
 658         tilcdc_panel_init();
 659         return platform_driver_register(&tilcdc_platform_driver);
 660 }
 661
 662 static void __exit tilcdc_drm_fini(void)
 663 {
 664         DBG("fini");
 665         platform_driver_unregister(&tilcdc_platform_driver);
 666         tilcdc_panel_fini();
 667         tilcdc_slave_fini();
 668         tilcdc_tfp410_fini();
 669 }
 670
 671 module_init(tilcdc_drm_init);
 672 module_exit(tilcdc_drm_fini);
 673
 674 MODULE_AUTHOR("Rob Clark <robdclark@gmail.com");
 675 MODULE_DESCRIPTION("TI LCD Controller DRM Driver");
 676 MODULE_LICENSE("GPL");