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
  24 #include "tilcdc_drv.h"
  25 #include "tilcdc_regs.h"
  26 #include "tilcdc_tfp410.h"
  27 #include "tilcdc_panel.h"
  28 #include "tilcdc_external.h"
  29
  30 #include "drm_fb_helper.h"
  31
  32 static LIST_HEAD(module_list);
  33
  34 void tilcdc_module_init(struct tilcdc_module *mod, const char *name,
  35                 const struct tilcdc_module_ops *funcs)
  36 {
  37         mod->name = name;
  38         mod->funcs = funcs;
  39         INIT_LIST_HEAD(&mod->list);
  40         list_add(&mod->list, &module_list);
  41 }
  42
  43 void tilcdc_module_cleanup(struct tilcdc_module *mod)
  44 {
  45         list_del(&mod->list);
  46 }
  47
  48 static struct of_device_id tilcdc_of_match[];
  49
  50 static struct drm_framebuffer *tilcdc_fb_create(struct drm_device *dev,
  51                 struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd)
  52 {
  53         return drm_fb_cma_create(dev, file_priv, mode_cmd);
  54 }
  55
  56 static void tilcdc_fb_output_poll_changed(struct drm_device *dev)
  57 {
  58         struct tilcdc_drm_private *priv = dev->dev_private;
  59         drm_fbdev_cma_hotplug_event(priv->fbdev);
  60 }
  61
  62 static const struct drm_mode_config_funcs mode_config_funcs = {
  63         .fb_create = tilcdc_fb_create,
  64         .output_poll_changed = tilcdc_fb_output_poll_changed,
  65 };
  66
  67 static int modeset_init(struct drm_device *dev)
  68 {
  69         struct tilcdc_drm_private *priv = dev->dev_private;
  70         struct tilcdc_module *mod;
  71
  72         drm_mode_config_init(dev);
  73
  74         priv->crtc = tilcdc_crtc_create(dev);
  75
  76         list_for_each_entry(mod, &module_list, list) {
  77                 DBG("loading module: %s", mod->name);
  78                 mod->funcs->modeset_init(mod, dev);
  79         }
  80
  81         dev->mode_config.min_width = 0;
  82         dev->mode_config.min_height = 0;
  83         dev->mode_config.max_width = tilcdc_crtc_max_width(priv->crtc);
  84         dev->mode_config.max_height = 2048;
  85         dev->mode_config.funcs = &mode_config_funcs;
  86
  87         return 0;
  88 }
  89
  90 #ifdef CONFIG_CPU_FREQ
  91 static int cpufreq_transition(struct notifier_block *nb,
  92                                      unsigned long val, void *data)
  93 {
  94         struct tilcdc_drm_private *priv = container_of(nb,
  95                         struct tilcdc_drm_private, freq_transition);
  96         if (val == CPUFREQ_POSTCHANGE) {
  97                 if (priv->lcd_fck_rate != clk_get_rate(priv->clk)) {
  98                         priv->lcd_fck_rate = clk_get_rate(priv->clk);
  99                         tilcdc_crtc_update_clk(priv->crtc);
 100                 }
 101         }
 102
 103         return 0;
 104 }
 105 #endif
 106
 107 /*
 108  * DRM operations:
 109  */
 110
 111 static int tilcdc_unload(struct drm_device *dev)
 112 {
 113         struct tilcdc_drm_private *priv = dev->dev_private;
 114
 115         tilcdc_crtc_dpms(priv->crtc, DRM_MODE_DPMS_OFF);
 116
 117         tilcdc_remove_external_encoders(dev);
 118
 119         drm_fbdev_cma_fini(priv->fbdev);
 120         drm_kms_helper_poll_fini(dev);
 121         drm_mode_config_cleanup(dev);
 122         drm_vblank_cleanup(dev);
 123
 124         pm_runtime_get_sync(dev->dev);
 125         drm_irq_uninstall(dev);
 126         pm_runtime_put_sync(dev->dev);
 127
 128 #ifdef CONFIG_CPU_FREQ
 129         cpufreq_unregister_notifier(&priv->freq_transition,
 130                         CPUFREQ_TRANSITION_NOTIFIER);
 131 #endif
 132
 133         if (priv->clk)
 134                 clk_put(priv->clk);
 135
 136         if (priv->mmio)
 137                 iounmap(priv->mmio);
 138
 139         flush_workqueue(priv->wq);
 140         destroy_workqueue(priv->wq);
 141
 142         dev->dev_private = NULL;
 143
 144         pm_runtime_disable(dev->dev);
 145
 146         return 0;
 147 }
 148
 149 static size_t tilcdc_num_regs(void);
 150
 151 static int tilcdc_load(struct drm_device *dev, unsigned long flags)
 152 {
 153         struct platform_device *pdev = dev->platformdev;
 154         struct device_node *node = pdev->dev.of_node;
 155         struct tilcdc_drm_private *priv;
 156         struct tilcdc_module *mod;
 157         struct resource *res;
 158         u32 bpp = 0;
 159         int ret;
 160
 161         priv = devm_kzalloc(dev->dev, sizeof(*priv), GFP_KERNEL);
 162         if (priv)
 163                 priv->saved_register =
 164                         devm_kcalloc(dev->dev, tilcdc_num_regs(),
 165                                      sizeof(*priv->saved_register), GFP_KERNEL);
 166         if (!priv || !priv->saved_register) {
 167                 dev_err(dev->dev, "failed to allocate private data\n");
 168                 return -ENOMEM;
 169         }
 170
 171         dev->dev_private = priv;
 172
 173         priv->is_componentized =
 174                 tilcdc_get_external_components(dev->dev, NULL) > 0;
 175
 176         priv->wq = alloc_ordered_workqueue("tilcdc", 0);
 177         if (!priv->wq) {
 178                 ret = -ENOMEM;
 179                 goto fail_unset_priv;
 180         }
 181
 182         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 183         if (!res) {
 184                 dev_err(dev->dev, "failed to get memory resource\n");
 185                 ret = -EINVAL;
 186                 goto fail_free_wq;
 187         }
 188
 189         priv->mmio = ioremap_nocache(res->start, resource_size(res));
 190         if (!priv->mmio) {
 191                 dev_err(dev->dev, "failed to ioremap\n");
 192                 ret = -ENOMEM;
 193                 goto fail_free_wq;
 194         }
 195
 196         priv->clk = clk_get(dev->dev, "fck");
 197         if (IS_ERR(priv->clk)) {
 198                 dev_err(dev->dev, "failed to get functional clock\n");
 199                 ret = -ENODEV;
 200                 goto fail_iounmap;
 201         }
 202
 203 #ifdef CONFIG_CPU_FREQ
 204         priv->lcd_fck_rate = clk_get_rate(priv->clk);
 205         priv->freq_transition.notifier_call = cpufreq_transition;
 206         ret = cpufreq_register_notifier(&priv->freq_transition,
 207                         CPUFREQ_TRANSITION_NOTIFIER);
 208         if (ret) {
 209                 dev_err(dev->dev, "failed to register cpufreq notifier\n");
 210                 goto fail_put_clk;
 211         }
 212 #endif
 213
 214         if (of_property_read_u32(node, "max-bandwidth", &priv->max_bandwidth))
 215                 priv->max_bandwidth = TILCDC_DEFAULT_MAX_BANDWIDTH;
 216
 217         DBG("Maximum Bandwidth Value %d", priv->max_bandwidth);
 218
 219         if (of_property_read_u32(node, "ti,max-width", &priv->max_width))
 220                 priv->max_width = TILCDC_DEFAULT_MAX_WIDTH;
 221
 222         DBG("Maximum Horizontal Pixel Width Value %dpixels", priv->max_width);
 223
 224         if (of_property_read_u32(node, "ti,max-pixelclock",
 225                                         &priv->max_pixelclock))
 226                 priv->max_pixelclock = TILCDC_DEFAULT_MAX_PIXELCLOCK;
 227
 228         DBG("Maximum Pixel Clock Value %dKHz", priv->max_pixelclock);
 229
 230         pm_runtime_enable(dev->dev);
 231
 232         /* Determine LCD IP Version */
 233         pm_runtime_get_sync(dev->dev);
 234         switch (tilcdc_read(dev, LCDC_PID_REG)) {
 235         case 0x4c100102:
 236                 priv->rev = 1;
 237                 break;
 238         case 0x4f200800:
 239         case 0x4f201000:
 240                 priv->rev = 2;
 241                 break;
 242         default:
 243                 dev_warn(dev->dev, "Unknown PID Reg value 0x%08x, "
 244                                 "defaulting to LCD revision 1\n",
 245                                 tilcdc_read(dev, LCDC_PID_REG));
 246                 priv->rev = 1;
 247                 break;
 248         }
 249
 250         pm_runtime_put_sync(dev->dev);
 251
 252         ret = modeset_init(dev);
 253         if (ret < 0) {
 254                 dev_err(dev->dev, "failed to initialize mode setting\n");
 255                 goto fail_cpufreq_unregister;
 256         }
 257
 258         platform_set_drvdata(pdev, dev);
 259
 260         if (priv->is_componentized) {
 261                 ret = component_bind_all(dev->dev, dev);
 262                 if (ret < 0)
 263                         goto fail_mode_config_cleanup;
 264
 265                 ret = tilcdc_add_external_encoders(dev, &bpp);
 266                 if (ret < 0)
 267                         goto fail_component_cleanup;
 268         }
 269
 270         if ((priv->num_encoders == 0) || (priv->num_connectors == 0)) {
 271                 dev_err(dev->dev, "no encoders/connectors found\n");
 272                 ret = -ENXIO;
 273                 goto fail_external_cleanup;
 274         }
 275
 276         ret = drm_vblank_init(dev, 1);
 277         if (ret < 0) {
 278                 dev_err(dev->dev, "failed to initialize vblank\n");
 279                 goto fail_external_cleanup;
 280         }
 281
 282         pm_runtime_get_sync(dev->dev);
 283         ret = drm_irq_install(dev, platform_get_irq(dev->platformdev, 0));
 284         pm_runtime_put_sync(dev->dev);
 285         if (ret < 0) {
 286                 dev_err(dev->dev, "failed to install IRQ handler\n");
 287                 goto fail_vblank_cleanup;
 288         }
 289
 290         list_for_each_entry(mod, &module_list, list) {
 291                 DBG("%s: preferred_bpp: %d", mod->name, mod->preferred_bpp);
 292                 bpp = mod->preferred_bpp;
 293                 if (bpp > 0)
 294                         break;
 295         }
 296
 297         drm_helper_disable_unused_functions(dev);
 298         priv->fbdev = drm_fbdev_cma_init(dev, bpp,
 299                         dev->mode_config.num_crtc,
 300                         dev->mode_config.num_connector);
 301         if (IS_ERR(priv->fbdev)) {
 302                 ret = PTR_ERR(priv->fbdev);
 303                 goto fail_irq_uninstall;
 304         }
 305
 306         drm_kms_helper_poll_init(dev);
 307
 308         return 0;
 309
 310 fail_irq_uninstall:
 311         pm_runtime_get_sync(dev->dev);
 312         drm_irq_uninstall(dev);
 313         pm_runtime_put_sync(dev->dev);
 314
 315 fail_vblank_cleanup:
 316         drm_vblank_cleanup(dev);
 317
 318 fail_mode_config_cleanup:
 319         drm_mode_config_cleanup(dev);
 320
 321 fail_component_cleanup:
 322         if (priv->is_componentized)
 323                 component_unbind_all(dev->dev, dev);
 324
 325 fail_external_cleanup:
 326         tilcdc_remove_external_encoders(dev);
 327
 328 fail_cpufreq_unregister:
 329         pm_runtime_disable(dev->dev);
 330 #ifdef CONFIG_CPU_FREQ
 331         cpufreq_unregister_notifier(&priv->freq_transition,
 332                         CPUFREQ_TRANSITION_NOTIFIER);
 333
 334 fail_put_clk:
 335 #endif
 336         clk_put(priv->clk);
 337
 338 fail_iounmap:
 339         iounmap(priv->mmio);
 340
 341 fail_free_wq:
 342         flush_workqueue(priv->wq);
 343         destroy_workqueue(priv->wq);
 344
 345 fail_unset_priv:
 346         dev->dev_private = NULL;
 347
 348         return ret;
 349 }
 350
 351 static void tilcdc_lastclose(struct drm_device *dev)
 352 {
 353         struct tilcdc_drm_private *priv = dev->dev_private;
 354         drm_fbdev_cma_restore_mode(priv->fbdev);
 355 }
 356
 357 static irqreturn_t tilcdc_irq(int irq, void *arg)
 358 {
 359         struct drm_device *dev = arg;
 360         struct tilcdc_drm_private *priv = dev->dev_private;
 361         return tilcdc_crtc_irq(priv->crtc);
 362 }
 363
 364 static void tilcdc_irq_preinstall(struct drm_device *dev)
 365 {
 366         tilcdc_clear_irqstatus(dev, 0xffffffff);
 367 }
 368
 369 static int tilcdc_irq_postinstall(struct drm_device *dev)
 370 {
 371         struct tilcdc_drm_private *priv = dev->dev_private;
 372
 373         /* enable FIFO underflow irq: */
 374         if (priv->rev == 1) {
 375                 tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_V1_UNDERFLOW_INT_ENA);
 376         } else {
 377                 tilcdc_write(dev, LCDC_INT_ENABLE_SET_REG,
 378                            LCDC_V2_UNDERFLOW_INT_ENA |
 379                            LCDC_V2_END_OF_FRAME0_INT_ENA |
 380                            LCDC_FRAME_DONE | LCDC_SYNC_LOST);
 381         }
 382
 383         return 0;
 384 }
 385
 386 static void tilcdc_irq_uninstall(struct drm_device *dev)
 387 {
 388         struct tilcdc_drm_private *priv = dev->dev_private;
 389
 390         /* disable irqs that we might have enabled: */
 391         if (priv->rev == 1) {
 392                 tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
 393                                 LCDC_V1_UNDERFLOW_INT_ENA | LCDC_V1_PL_INT_ENA);
 394                 tilcdc_clear(dev, LCDC_DMA_CTRL_REG, LCDC_V1_END_OF_FRAME_INT_ENA);
 395         } else {
 396                 tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG,
 397                         LCDC_V2_UNDERFLOW_INT_ENA | LCDC_V2_PL_INT_ENA |
 398                         LCDC_V2_END_OF_FRAME0_INT_ENA |
 399                         LCDC_FRAME_DONE | LCDC_SYNC_LOST);
 400         }
 401 }
 402
 403 static int tilcdc_enable_vblank(struct drm_device *dev, unsigned int pipe)
 404 {
 405         return 0;
 406 }
 407
 408 static void tilcdc_disable_vblank(struct drm_device *dev, unsigned int pipe)
 409 {
 410         return;
 411 }
 412
 413 #if defined(CONFIG_DEBUG_FS) || defined(CONFIG_PM_SLEEP)
 414 static const struct {
 415         const char *name;
 416         uint8_t  rev;
 417         uint8_t  save;
 418         uint32_t reg;
 419 } registers[] =         {
 420 #define REG(rev, save, reg) { #reg, rev, save, reg }
 421                 /* exists in revision 1: */
 422                 REG(1, false, LCDC_PID_REG),
 423                 REG(1, true,  LCDC_CTRL_REG),
 424                 REG(1, false, LCDC_STAT_REG),
 425                 REG(1, true,  LCDC_RASTER_CTRL_REG),
 426                 REG(1, true,  LCDC_RASTER_TIMING_0_REG),
 427                 REG(1, true,  LCDC_RASTER_TIMING_1_REG),
 428                 REG(1, true,  LCDC_RASTER_TIMING_2_REG),
 429                 REG(1, true,  LCDC_DMA_CTRL_REG),
 430                 REG(1, true,  LCDC_DMA_FB_BASE_ADDR_0_REG),
 431                 REG(1, true,  LCDC_DMA_FB_CEILING_ADDR_0_REG),
 432                 REG(1, true,  LCDC_DMA_FB_BASE_ADDR_1_REG),
 433                 REG(1, true,  LCDC_DMA_FB_CEILING_ADDR_1_REG),
 434                 /* new in revision 2: */
 435                 REG(2, false, LCDC_RAW_STAT_REG),
 436                 REG(2, false, LCDC_MASKED_STAT_REG),
 437                 REG(2, true, LCDC_INT_ENABLE_SET_REG),
 438                 REG(2, false, LCDC_INT_ENABLE_CLR_REG),
 439                 REG(2, false, LCDC_END_OF_INT_IND_REG),
 440                 REG(2, true,  LCDC_CLK_ENABLE_REG),
 441 #undef REG
 442 };
 443
 444 static size_t tilcdc_num_regs(void)
 445 {
 446         return ARRAY_SIZE(registers);
 447 }
 448 #else
 449 static size_t tilcdc_num_regs(void)
 450 {
 451         return 0;
 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                                DRIVER_PRIME),
 541         .load               = tilcdc_load,
 542         .unload             = tilcdc_unload,
 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_no_hw_counter,
 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
 558         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 559         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 560         .gem_prime_import       = drm_gem_prime_import,
 561         .gem_prime_export       = drm_gem_prime_export,
 562         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 563         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 564         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 565         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 566         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 567 #ifdef CONFIG_DEBUG_FS
 568         .debugfs_init       = tilcdc_debugfs_init,
 569         .debugfs_cleanup    = tilcdc_debugfs_cleanup,
 570 #endif
 571         .fops               = &fops,
 572         .name               = "tilcdc",
 573         .desc               = "TI LCD Controller DRM",
 574         .date               = "20121205",
 575         .major              = 1,
 576         .minor              = 0,
 577 };
 578
 579 /*
 580  * Power management:
 581  */
 582
 583 #ifdef CONFIG_PM_SLEEP
 584 static int tilcdc_pm_suspend(struct device *dev)
 585 {
 586         struct drm_device *ddev = dev_get_drvdata(dev);
 587         struct tilcdc_drm_private *priv = ddev->dev_private;
 588         unsigned i, n = 0;
 589
 590         drm_kms_helper_poll_disable(ddev);
 591
 592         /* Select sleep pin state */
 593         pinctrl_pm_select_sleep_state(dev);
 594
 595         if (pm_runtime_suspended(dev)) {
 596                 priv->ctx_valid = false;
 597                 return 0;
 598         }
 599
 600         /* Disable the LCDC controller, to avoid locking up the PRCM */
 601         tilcdc_crtc_dpms(priv->crtc, DRM_MODE_DPMS_OFF);
 602
 603         /* Save register state: */
 604         for (i = 0; i < ARRAY_SIZE(registers); i++)
 605                 if (registers[i].save && (priv->rev >= registers[i].rev))
 606                         priv->saved_register[n++] = tilcdc_read(ddev, registers[i].reg);
 607
 608         priv->ctx_valid = true;
 609
 610         return 0;
 611 }
 612
 613 static int tilcdc_pm_resume(struct device *dev)
 614 {
 615         struct drm_device *ddev = dev_get_drvdata(dev);
 616         struct tilcdc_drm_private *priv = ddev->dev_private;
 617         unsigned i, n = 0;
 618
 619         /* Select default pin state */
 620         pinctrl_pm_select_default_state(dev);
 621
 622         if (priv->ctx_valid == true) {
 623                 /* Restore register state: */
 624                 for (i = 0; i < ARRAY_SIZE(registers); i++)
 625                         if (registers[i].save &&
 626                             (priv->rev >= registers[i].rev))
 627                                 tilcdc_write(ddev, registers[i].reg,
 628                                              priv->saved_register[n++]);
 629         }
 630
 631         drm_kms_helper_poll_enable(ddev);
 632
 633         return 0;
 634 }
 635 #endif
 636
 637 static const struct dev_pm_ops tilcdc_pm_ops = {
 638         SET_SYSTEM_SLEEP_PM_OPS(tilcdc_pm_suspend, tilcdc_pm_resume)
 639 };
 640
 641 /*
 642  * Platform driver:
 643  */
 644
 645 static int tilcdc_bind(struct device *dev)
 646 {
 647         return drm_platform_init(&tilcdc_driver, to_platform_device(dev));
 648 }
 649
 650 static void tilcdc_unbind(struct device *dev)
 651 {
 652         drm_put_dev(dev_get_drvdata(dev));
 653 }
 654
 655 static const struct component_master_ops tilcdc_comp_ops = {
 656         .bind = tilcdc_bind,
 657         .unbind = tilcdc_unbind,
 658 };
 659
 660 static int tilcdc_pdev_probe(struct platform_device *pdev)
 661 {
 662         struct component_match *match = NULL;
 663         int ret;
 664
 665         /* bail out early if no DT data: */
 666         if (!pdev->dev.of_node) {
 667                 dev_err(&pdev->dev, "device-tree data is missing\n");
 668                 return -ENXIO;
 669         }
 670
 671         ret = tilcdc_get_external_components(&pdev->dev, &match);
 672         if (ret < 0)
 673                 return ret;
 674         else if (ret == 0)
 675                 return drm_platform_init(&tilcdc_driver, pdev);
 676         else
 677                 return component_master_add_with_match(&pdev->dev,
 678                                                        &tilcdc_comp_ops,
 679                                                        match);
 680 }
 681
 682 static int tilcdc_pdev_remove(struct platform_device *pdev)
 683 {
 684         struct drm_device *ddev = dev_get_drvdata(&pdev->dev);
 685         struct tilcdc_drm_private *priv = ddev->dev_private;
 686
 687         /* Check if a subcomponent has already triggered the unloading. */
 688         if (!priv)
 689                 return 0;
 690
 691         if (priv->is_componentized)
 692                 component_master_del(&pdev->dev, &tilcdc_comp_ops);
 693         else
 694                 drm_put_dev(platform_get_drvdata(pdev));
 695
 696         return 0;
 697 }
 698
 699 static struct of_device_id tilcdc_of_match[] = {
 700                 { .compatible = "ti,am33xx-tilcdc", },
 701                 { },
 702 };
 703 MODULE_DEVICE_TABLE(of, tilcdc_of_match);
 704
 705 static struct platform_driver tilcdc_platform_driver = {
 706         .probe      = tilcdc_pdev_probe,
 707         .remove     = tilcdc_pdev_remove,
 708         .driver     = {
 709                 .name   = "tilcdc",
 710                 .pm     = &tilcdc_pm_ops,
 711                 .of_match_table = tilcdc_of_match,
 712         },
 713 };
 714
 715 static int __init tilcdc_drm_init(void)
 716 {
 717         DBG("init");
 718         tilcdc_tfp410_init();
 719         tilcdc_panel_init();
 720         return platform_driver_register(&tilcdc_platform_driver);
 721 }
 722
 723 static void __exit tilcdc_drm_fini(void)
 724 {
 725         DBG("fini");
 726         platform_driver_unregister(&tilcdc_platform_driver);
 727         tilcdc_panel_fini();
 728         tilcdc_tfp410_fini();
 729 }
 730
 731 module_init(tilcdc_drm_init);
 732 module_exit(tilcdc_drm_fini);
 733
 734 MODULE_AUTHOR("Rob Clark <robdclark@gmail.com");
 735 MODULE_DESCRIPTION("TI LCD Controller DRM Driver");
 736 MODULE_LICENSE("GPL");