drivers/gpu/drm/exynos/exynos_drm_drv.c

   1 /*
   2  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   3  * Authors:
   4  *      Inki Dae <inki.dae@samsung.com>
   5  *      Joonyoung Shim <jy0922.shim@samsung.com>
   6  *      Seung-Woo Kim <sw0312.kim@samsung.com>
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  */
  13
  14 #include <linux/pm_runtime.h>
  15 #include <drm/drmP.h>
  16 #include <drm/drm_atomic.h>
  17 #include <drm/drm_atomic_helper.h>
  18 #include <drm/drm_crtc_helper.h>
  19
  20 #include <linux/component.h>
  21
  22 #include <drm/exynos_drm.h>
  23
  24 #include "exynos_drm_drv.h"
  25 #include "exynos_drm_crtc.h"
  26 #include "exynos_drm_fbdev.h"
  27 #include "exynos_drm_fb.h"
  28 #include "exynos_drm_gem.h"
  29 #include "exynos_drm_plane.h"
  30 #include "exynos_drm_vidi.h"
  31 #include "exynos_drm_g2d.h"
  32 #include "exynos_drm_ipp.h"
  33 #include "exynos_drm_iommu.h"
  34
  35 #define DRIVER_NAME     "exynos"
  36 #define DRIVER_DESC     "Samsung SoC DRM"
  37 #define DRIVER_DATE     "20110530"
  38 #define DRIVER_MAJOR    1
  39 #define DRIVER_MINOR    0
  40
  41 struct exynos_atomic_commit {
  42         struct work_struct      work;
  43         struct drm_device       *dev;
  44         struct drm_atomic_state *state;
  45         u32                     crtcs;
  46 };
  47
  48 static void exynos_atomic_wait_for_commit(struct drm_atomic_state *state)
  49 {
  50         struct drm_crtc_state *crtc_state;
  51         struct drm_crtc *crtc;
  52         int i, ret;
  53
  54         for_each_crtc_in_state(state, crtc, crtc_state, i) {
  55                 struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
  56
  57                 if (!crtc->state->enable)
  58                         continue;
  59
  60                 ret = drm_crtc_vblank_get(crtc);
  61                 if (ret)
  62                         continue;
  63
  64                 exynos_drm_crtc_wait_pending_update(exynos_crtc);
  65                 drm_crtc_vblank_put(crtc);
  66         }
  67 }
  68
  69 static void exynos_atomic_commit_complete(struct exynos_atomic_commit *commit)
  70 {
  71         struct drm_device *dev = commit->dev;
  72         struct exynos_drm_private *priv = dev->dev_private;
  73         struct drm_atomic_state *state = commit->state;
  74         struct drm_plane *plane;
  75         struct drm_crtc *crtc;
  76         struct drm_plane_state *plane_state;
  77         struct drm_crtc_state *crtc_state;
  78         int i;
  79
  80         drm_atomic_helper_commit_modeset_disables(dev, state);
  81
  82         drm_atomic_helper_commit_modeset_enables(dev, state);
  83
  84         /*
  85          * Exynos can't update planes with CRTCs and encoders disabled,
  86          * its updates routines, specially for FIMD, requires the clocks
  87          * to be enabled. So it is necessary to handle the modeset operations
  88          * *before* the commit_planes() step, this way it will always
  89          * have the relevant clocks enabled to perform the update.
  90          */
  91
  92         for_each_crtc_in_state(state, crtc, crtc_state, i) {
  93                 struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
  94
  95                 atomic_set(&exynos_crtc->pending_update, 0);
  96         }
  97
  98         for_each_plane_in_state(state, plane, plane_state, i) {
  99                 struct exynos_drm_crtc *exynos_crtc =
 100                                                 to_exynos_crtc(plane->crtc);
 101
 102                 if (!plane->crtc)
 103                         continue;
 104
 105                 atomic_inc(&exynos_crtc->pending_update);
 106         }
 107
 108         drm_atomic_helper_commit_planes(dev, state, false);
 109
 110         exynos_atomic_wait_for_commit(state);
 111
 112         drm_atomic_helper_cleanup_planes(dev, state);
 113
 114         drm_atomic_state_free(state);
 115
 116         spin_lock(&priv->lock);
 117         priv->pending &= ~commit->crtcs;
 118         spin_unlock(&priv->lock);
 119
 120         wake_up_all(&priv->wait);
 121
 122         kfree(commit);
 123 }
 124
 125 static void exynos_drm_atomic_work(struct work_struct *work)
 126 {
 127         struct exynos_atomic_commit *commit = container_of(work,
 128                                 struct exynos_atomic_commit, work);
 129
 130         exynos_atomic_commit_complete(commit);
 131 }
 132
 133 static int exynos_drm_load(struct drm_device *dev, unsigned long flags)
 134 {
 135         struct exynos_drm_private *private;
 136         struct drm_encoder *encoder;
 137         unsigned int clone_mask;
 138         int cnt, ret;
 139
 140         private = kzalloc(sizeof(struct exynos_drm_private), GFP_KERNEL);
 141         if (!private)
 142                 return -ENOMEM;
 143
 144         init_waitqueue_head(&private->wait);
 145         spin_lock_init(&private->lock);
 146
 147         dev_set_drvdata(dev->dev, dev);
 148         dev->dev_private = (void *)private;
 149
 150         /*
 151          * create mapping to manage iommu table and set a pointer to iommu
 152          * mapping structure to iommu_mapping of private data.
 153          * also this iommu_mapping can be used to check if iommu is supported
 154          * or not.
 155          */
 156         ret = drm_create_iommu_mapping(dev);
 157         if (ret < 0) {
 158                 DRM_ERROR("failed to create iommu mapping.\n");
 159                 goto err_free_private;
 160         }
 161
 162         drm_mode_config_init(dev);
 163
 164         exynos_drm_mode_config_init(dev);
 165
 166         /* setup possible_clones. */
 167         cnt = 0;
 168         clone_mask = 0;
 169         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 170                 clone_mask |= (1 << (cnt++));
 171
 172         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 173                 encoder->possible_clones = clone_mask;
 174
 175         platform_set_drvdata(dev->platformdev, dev);
 176
 177         /* Try to bind all sub drivers. */
 178         ret = component_bind_all(dev->dev, dev);
 179         if (ret)
 180                 goto err_mode_config_cleanup;
 181
 182         ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
 183         if (ret)
 184                 goto err_unbind_all;
 185
 186         /* Probe non kms sub drivers and virtual display driver. */
 187         ret = exynos_drm_device_subdrv_probe(dev);
 188         if (ret)
 189                 goto err_cleanup_vblank;
 190
 191         drm_mode_config_reset(dev);
 192
 193         /*
 194          * enable drm irq mode.
 195          * - with irq_enabled = true, we can use the vblank feature.
 196          *
 197          * P.S. note that we wouldn't use drm irq handler but
 198          *      just specific driver own one instead because
 199          *      drm framework supports only one irq handler.
 200          */
 201         dev->irq_enabled = true;
 202
 203         /*
 204          * with vblank_disable_allowed = true, vblank interrupt will be disabled
 205          * by drm timer once a current process gives up ownership of
 206          * vblank event.(after drm_vblank_put function is called)
 207          */
 208         dev->vblank_disable_allowed = true;
 209
 210         /* init kms poll for handling hpd */
 211         drm_kms_helper_poll_init(dev);
 212
 213         /* force connectors detection */
 214         drm_helper_hpd_irq_event(dev);
 215
 216         return 0;
 217
 218 err_cleanup_vblank:
 219         drm_vblank_cleanup(dev);
 220 err_unbind_all:
 221         component_unbind_all(dev->dev, dev);
 222 err_mode_config_cleanup:
 223         drm_mode_config_cleanup(dev);
 224         drm_release_iommu_mapping(dev);
 225 err_free_private:
 226         kfree(private);
 227
 228         return ret;
 229 }
 230
 231 static int exynos_drm_unload(struct drm_device *dev)
 232 {
 233         exynos_drm_device_subdrv_remove(dev);
 234
 235         exynos_drm_fbdev_fini(dev);
 236         drm_kms_helper_poll_fini(dev);
 237
 238         drm_vblank_cleanup(dev);
 239         component_unbind_all(dev->dev, dev);
 240         drm_mode_config_cleanup(dev);
 241         drm_release_iommu_mapping(dev);
 242
 243         kfree(dev->dev_private);
 244         dev->dev_private = NULL;
 245
 246         return 0;
 247 }
 248
 249 static int commit_is_pending(struct exynos_drm_private *priv, u32 crtcs)
 250 {
 251         bool pending;
 252
 253         spin_lock(&priv->lock);
 254         pending = priv->pending & crtcs;
 255         spin_unlock(&priv->lock);
 256
 257         return pending;
 258 }
 259
 260 int exynos_atomic_commit(struct drm_device *dev, struct drm_atomic_state *state,
 261                          bool async)
 262 {
 263         struct exynos_drm_private *priv = dev->dev_private;
 264         struct exynos_atomic_commit *commit;
 265         int i, ret;
 266
 267         commit = kzalloc(sizeof(*commit), GFP_KERNEL);
 268         if (!commit)
 269                 return -ENOMEM;
 270
 271         ret = drm_atomic_helper_prepare_planes(dev, state);
 272         if (ret) {
 273                 kfree(commit);
 274                 return ret;
 275         }
 276
 277         /* This is the point of no return */
 278
 279         INIT_WORK(&commit->work, exynos_drm_atomic_work);
 280         commit->dev = dev;
 281         commit->state = state;
 282
 283         /* Wait until all affected CRTCs have completed previous commits and
 284          * mark them as pending.
 285          */
 286         for (i = 0; i < dev->mode_config.num_crtc; ++i) {
 287                 if (state->crtcs[i])
 288                         commit->crtcs |= 1 << drm_crtc_index(state->crtcs[i]);
 289         }
 290
 291         wait_event(priv->wait, !commit_is_pending(priv, commit->crtcs));
 292
 293         spin_lock(&priv->lock);
 294         priv->pending |= commit->crtcs;
 295         spin_unlock(&priv->lock);
 296
 297         drm_atomic_helper_swap_state(dev, state);
 298
 299         if (async)
 300                 schedule_work(&commit->work);
 301         else
 302                 exynos_atomic_commit_complete(commit);
 303
 304         return 0;
 305 }
 306
 307 static int exynos_drm_open(struct drm_device *dev, struct drm_file *file)
 308 {
 309         struct drm_exynos_file_private *file_priv;
 310         int ret;
 311
 312         file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL);
 313         if (!file_priv)
 314                 return -ENOMEM;
 315
 316         file->driver_priv = file_priv;
 317
 318         ret = exynos_drm_subdrv_open(dev, file);
 319         if (ret)
 320                 goto err_file_priv_free;
 321
 322         return ret;
 323
 324 err_file_priv_free:
 325         kfree(file_priv);
 326         file->driver_priv = NULL;
 327         return ret;
 328 }
 329
 330 static void exynos_drm_preclose(struct drm_device *dev,
 331                                         struct drm_file *file)
 332 {
 333         exynos_drm_subdrv_close(dev, file);
 334 }
 335
 336 static void exynos_drm_postclose(struct drm_device *dev, struct drm_file *file)
 337 {
 338         struct drm_pending_event *e, *et;
 339         unsigned long flags;
 340
 341         if (!file->driver_priv)
 342                 return;
 343
 344         spin_lock_irqsave(&dev->event_lock, flags);
 345         /* Release all events handled by page flip handler but not freed. */
 346         list_for_each_entry_safe(e, et, &file->event_list, link) {
 347                 list_del(&e->link);
 348                 e->destroy(e);
 349         }
 350         spin_unlock_irqrestore(&dev->event_lock, flags);
 351
 352         kfree(file->driver_priv);
 353         file->driver_priv = NULL;
 354 }
 355
 356 static void exynos_drm_lastclose(struct drm_device *dev)
 357 {
 358         exynos_drm_fbdev_restore_mode(dev);
 359 }
 360
 361 static const struct vm_operations_struct exynos_drm_gem_vm_ops = {
 362         .fault = exynos_drm_gem_fault,
 363         .open = drm_gem_vm_open,
 364         .close = drm_gem_vm_close,
 365 };
 366
 367 static const struct drm_ioctl_desc exynos_ioctls[] = {
 368         DRM_IOCTL_DEF_DRV(EXYNOS_GEM_CREATE, exynos_drm_gem_create_ioctl,
 369                         DRM_AUTH | DRM_RENDER_ALLOW),
 370         DRM_IOCTL_DEF_DRV(EXYNOS_GEM_GET, exynos_drm_gem_get_ioctl,
 371                         DRM_RENDER_ALLOW),
 372         DRM_IOCTL_DEF_DRV(EXYNOS_VIDI_CONNECTION, vidi_connection_ioctl,
 373                         DRM_AUTH),
 374         DRM_IOCTL_DEF_DRV(EXYNOS_G2D_GET_VER, exynos_g2d_get_ver_ioctl,
 375                         DRM_AUTH | DRM_RENDER_ALLOW),
 376         DRM_IOCTL_DEF_DRV(EXYNOS_G2D_SET_CMDLIST, exynos_g2d_set_cmdlist_ioctl,
 377                         DRM_AUTH | DRM_RENDER_ALLOW),
 378         DRM_IOCTL_DEF_DRV(EXYNOS_G2D_EXEC, exynos_g2d_exec_ioctl,
 379                         DRM_AUTH | DRM_RENDER_ALLOW),
 380         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_GET_PROPERTY, exynos_drm_ipp_get_property,
 381                         DRM_AUTH | DRM_RENDER_ALLOW),
 382         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_SET_PROPERTY, exynos_drm_ipp_set_property,
 383                         DRM_AUTH | DRM_RENDER_ALLOW),
 384         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_QUEUE_BUF, exynos_drm_ipp_queue_buf,
 385                         DRM_AUTH | DRM_RENDER_ALLOW),
 386         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_CMD_CTRL, exynos_drm_ipp_cmd_ctrl,
 387                         DRM_AUTH | DRM_RENDER_ALLOW),
 388 };
 389
 390 static const struct file_operations exynos_drm_driver_fops = {
 391         .owner          = THIS_MODULE,
 392         .open           = drm_open,
 393         .mmap           = exynos_drm_gem_mmap,
 394         .poll           = drm_poll,
 395         .read           = drm_read,
 396         .unlocked_ioctl = drm_ioctl,
 397 #ifdef CONFIG_COMPAT
 398         .compat_ioctl = drm_compat_ioctl,
 399 #endif
 400         .release        = drm_release,
 401 };
 402
 403 static struct drm_driver exynos_drm_driver = {
 404         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME
 405                                   | DRIVER_ATOMIC | DRIVER_RENDER,
 406         .load                   = exynos_drm_load,
 407         .unload                 = exynos_drm_unload,
 408         .open                   = exynos_drm_open,
 409         .preclose               = exynos_drm_preclose,
 410         .lastclose              = exynos_drm_lastclose,
 411         .postclose              = exynos_drm_postclose,
 412         .set_busid              = drm_platform_set_busid,
 413         .get_vblank_counter     = drm_vblank_no_hw_counter,
 414         .enable_vblank          = exynos_drm_crtc_enable_vblank,
 415         .disable_vblank         = exynos_drm_crtc_disable_vblank,
 416         .gem_free_object        = exynos_drm_gem_free_object,
 417         .gem_vm_ops             = &exynos_drm_gem_vm_ops,
 418         .dumb_create            = exynos_drm_gem_dumb_create,
 419         .dumb_map_offset        = exynos_drm_gem_dumb_map_offset,
 420         .dumb_destroy           = drm_gem_dumb_destroy,
 421         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 422         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 423         .gem_prime_export       = drm_gem_prime_export,
 424         .gem_prime_import       = drm_gem_prime_import,
 425         .gem_prime_get_sg_table = exynos_drm_gem_prime_get_sg_table,
 426         .gem_prime_import_sg_table      = exynos_drm_gem_prime_import_sg_table,
 427         .gem_prime_vmap         = exynos_drm_gem_prime_vmap,
 428         .gem_prime_vunmap       = exynos_drm_gem_prime_vunmap,
 429         .ioctls                 = exynos_ioctls,
 430         .num_ioctls             = ARRAY_SIZE(exynos_ioctls),
 431         .fops                   = &exynos_drm_driver_fops,
 432         .name   = DRIVER_NAME,
 433         .desc   = DRIVER_DESC,
 434         .date   = DRIVER_DATE,
 435         .major  = DRIVER_MAJOR,
 436         .minor  = DRIVER_MINOR,
 437 };
 438
 439 #ifdef CONFIG_PM_SLEEP
 440 static int exynos_drm_suspend(struct device *dev)
 441 {
 442         struct drm_device *drm_dev = dev_get_drvdata(dev);
 443         struct drm_connector *connector;
 444
 445         if (pm_runtime_suspended(dev) || !drm_dev)
 446                 return 0;
 447
 448         drm_modeset_lock_all(drm_dev);
 449         drm_for_each_connector(connector, drm_dev) {
 450                 int old_dpms = connector->dpms;
 451
 452                 if (connector->funcs->dpms)
 453                         connector->funcs->dpms(connector, DRM_MODE_DPMS_OFF);
 454
 455                 /* Set the old mode back to the connector for resume */
 456                 connector->dpms = old_dpms;
 457         }
 458         drm_modeset_unlock_all(drm_dev);
 459
 460         return 0;
 461 }
 462
 463 static int exynos_drm_resume(struct device *dev)
 464 {
 465         struct drm_device *drm_dev = dev_get_drvdata(dev);
 466         struct drm_connector *connector;
 467
 468         if (pm_runtime_suspended(dev) || !drm_dev)
 469                 return 0;
 470
 471         drm_modeset_lock_all(drm_dev);
 472         drm_for_each_connector(connector, drm_dev) {
 473                 if (connector->funcs->dpms) {
 474                         int dpms = connector->dpms;
 475
 476                         connector->dpms = DRM_MODE_DPMS_OFF;
 477                         connector->funcs->dpms(connector, dpms);
 478                 }
 479         }
 480         drm_modeset_unlock_all(drm_dev);
 481
 482         return 0;
 483 }
 484 #endif
 485
 486 static const struct dev_pm_ops exynos_drm_pm_ops = {
 487         SET_SYSTEM_SLEEP_PM_OPS(exynos_drm_suspend, exynos_drm_resume)
 488 };
 489
 490 /* forward declaration */
 491 static struct platform_driver exynos_drm_platform_driver;
 492
 493 /*
 494  * Connector drivers should not be placed before associated crtc drivers,
 495  * because connector requires pipe number of its crtc during initialization.
 496  */
 497 static struct platform_driver *const exynos_drm_kms_drivers[] = {
 498 #ifdef CONFIG_DRM_EXYNOS_FIMD
 499         &fimd_driver,
 500 #endif
 501 #ifdef CONFIG_DRM_EXYNOS5433_DECON
 502         &exynos5433_decon_driver,
 503 #endif
 504 #ifdef CONFIG_DRM_EXYNOS7_DECON
 505         &decon_driver,
 506 #endif
 507 #ifdef CONFIG_DRM_EXYNOS_MIC
 508         &mic_driver,
 509 #endif
 510 #ifdef CONFIG_DRM_EXYNOS_DP
 511         &dp_driver,
 512 #endif
 513 #ifdef CONFIG_DRM_EXYNOS_DSI
 514         &dsi_driver,
 515 #endif
 516 #ifdef CONFIG_DRM_EXYNOS_MIXER
 517         &mixer_driver,
 518 #endif
 519 #ifdef CONFIG_DRM_EXYNOS_HDMI
 520         &hdmi_driver,
 521 #endif
 522 #ifdef CONFIG_DRM_EXYNOS_VIDI
 523         &vidi_driver,
 524 #endif
 525 };
 526
 527 static struct platform_driver *const exynos_drm_non_kms_drivers[] = {
 528 #ifdef CONFIG_DRM_EXYNOS_G2D
 529         &g2d_driver,
 530 #endif
 531 #ifdef CONFIG_DRM_EXYNOS_FIMC
 532         &fimc_driver,
 533 #endif
 534 #ifdef CONFIG_DRM_EXYNOS_ROTATOR
 535         &rotator_driver,
 536 #endif
 537 #ifdef CONFIG_DRM_EXYNOS_GSC
 538         &gsc_driver,
 539 #endif
 540 #ifdef CONFIG_DRM_EXYNOS_IPP
 541         &ipp_driver,
 542 #endif
 543         &exynos_drm_platform_driver,
 544 };
 545
 546 static struct platform_driver *const exynos_drm_drv_with_simple_dev[] = {
 547 #ifdef CONFIG_DRM_EXYNOS_VIDI
 548         &vidi_driver,
 549 #endif
 550 #ifdef CONFIG_DRM_EXYNOS_IPP
 551         &ipp_driver,
 552 #endif
 553         &exynos_drm_platform_driver,
 554 };
 555 #define PDEV_COUNT ARRAY_SIZE(exynos_drm_drv_with_simple_dev)
 556
 557 static int compare_dev(struct device *dev, void *data)
 558 {
 559         return dev == (struct device *)data;
 560 }
 561
 562 static struct component_match *exynos_drm_match_add(struct device *dev)
 563 {
 564         struct component_match *match = NULL;
 565         int i;
 566
 567         for (i = 0; i < ARRAY_SIZE(exynos_drm_kms_drivers); ++i) {
 568                 struct device_driver *drv = &exynos_drm_kms_drivers[i]->driver;
 569                 struct device *p = NULL, *d;
 570
 571                 while ((d = bus_find_device(&platform_bus_type, p, drv,
 572                                             (void *)platform_bus_type.match))) {
 573                         put_device(p);
 574                         component_match_add(dev, &match, compare_dev, d);
 575                         p = d;
 576                 }
 577                 put_device(p);
 578         }
 579
 580         return match ?: ERR_PTR(-ENODEV);
 581 }
 582
 583 static int exynos_drm_bind(struct device *dev)
 584 {
 585         return drm_platform_init(&exynos_drm_driver, to_platform_device(dev));
 586 }
 587
 588 static void exynos_drm_unbind(struct device *dev)
 589 {
 590         drm_put_dev(dev_get_drvdata(dev));
 591 }
 592
 593 static const struct component_master_ops exynos_drm_ops = {
 594         .bind           = exynos_drm_bind,
 595         .unbind         = exynos_drm_unbind,
 596 };
 597
 598 static int exynos_drm_platform_probe(struct platform_device *pdev)
 599 {
 600         struct component_match *match;
 601
 602         pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 603         exynos_drm_driver.num_ioctls = ARRAY_SIZE(exynos_ioctls);
 604
 605         match = exynos_drm_match_add(&pdev->dev);
 606         if (IS_ERR(match))
 607                 return PTR_ERR(match);
 608
 609         return component_master_add_with_match(&pdev->dev, &exynos_drm_ops,
 610                                                match);
 611 }
 612
 613 static int exynos_drm_platform_remove(struct platform_device *pdev)
 614 {
 615         component_master_del(&pdev->dev, &exynos_drm_ops);
 616         return 0;
 617 }
 618
 619 static struct platform_driver exynos_drm_platform_driver = {
 620         .probe  = exynos_drm_platform_probe,
 621         .remove = exynos_drm_platform_remove,
 622         .driver = {
 623                 .name   = "exynos-drm",
 624                 .pm     = &exynos_drm_pm_ops,
 625         },
 626 };
 627
 628 static struct platform_device *exynos_drm_pdevs[PDEV_COUNT];
 629
 630 static void exynos_drm_unregister_devices(void)
 631 {
 632         int i = PDEV_COUNT;
 633
 634         while (--i >= 0) {
 635                 platform_device_unregister(exynos_drm_pdevs[i]);
 636                 exynos_drm_pdevs[i] = NULL;
 637         }
 638 }
 639
 640 static int exynos_drm_register_devices(void)
 641 {
 642         int i;
 643
 644         for (i = 0; i < PDEV_COUNT; ++i) {
 645                 struct platform_driver *d = exynos_drm_drv_with_simple_dev[i];
 646                 struct platform_device *pdev =
 647                         platform_device_register_simple(d->driver.name, -1,
 648                                                         NULL, 0);
 649
 650                 if (!IS_ERR(pdev)) {
 651                         exynos_drm_pdevs[i] = pdev;
 652                         continue;
 653                 }
 654                 while (--i >= 0) {
 655                         platform_device_unregister(exynos_drm_pdevs[i]);
 656                         exynos_drm_pdevs[i] = NULL;
 657                 }
 658
 659                 return PTR_ERR(pdev);
 660         }
 661
 662         return 0;
 663 }
 664
 665 static void exynos_drm_unregister_drivers(struct platform_driver * const *drv,
 666                                           int count)
 667 {
 668         while (--count >= 0)
 669                 platform_driver_unregister(drv[count]);
 670 }
 671
 672 static int exynos_drm_register_drivers(struct platform_driver * const *drv,
 673                                        int count)
 674 {
 675         int i, ret;
 676
 677         for (i = 0; i < count; ++i) {
 678                 ret = platform_driver_register(drv[i]);
 679                 if (!ret)
 680                         continue;
 681
 682                 while (--i >= 0)
 683                         platform_driver_unregister(drv[i]);
 684
 685                 return ret;
 686         }
 687
 688         return 0;
 689 }
 690
 691 static inline int exynos_drm_register_kms_drivers(void)
 692 {
 693         return exynos_drm_register_drivers(exynos_drm_kms_drivers,
 694                                         ARRAY_SIZE(exynos_drm_kms_drivers));
 695 }
 696
 697 static inline int exynos_drm_register_non_kms_drivers(void)
 698 {
 699         return exynos_drm_register_drivers(exynos_drm_non_kms_drivers,
 700                                         ARRAY_SIZE(exynos_drm_non_kms_drivers));
 701 }
 702
 703 static inline void exynos_drm_unregister_kms_drivers(void)
 704 {
 705         exynos_drm_unregister_drivers(exynos_drm_kms_drivers,
 706                                         ARRAY_SIZE(exynos_drm_kms_drivers));
 707 }
 708
 709 static inline void exynos_drm_unregister_non_kms_drivers(void)
 710 {
 711         exynos_drm_unregister_drivers(exynos_drm_non_kms_drivers,
 712                                         ARRAY_SIZE(exynos_drm_non_kms_drivers));
 713 }
 714
 715 static int exynos_drm_init(void)
 716 {
 717         int ret;
 718
 719         ret = exynos_drm_register_devices();
 720         if (ret)
 721                 return ret;
 722
 723         ret = exynos_drm_register_kms_drivers();
 724         if (ret)
 725                 goto err_unregister_pdevs;
 726
 727         ret = exynos_drm_register_non_kms_drivers();
 728         if (ret)
 729                 goto err_unregister_kms_drivers;
 730
 731         return 0;
 732
 733 err_unregister_kms_drivers:
 734         exynos_drm_unregister_kms_drivers();
 735
 736 err_unregister_pdevs:
 737         exynos_drm_unregister_devices();
 738
 739         return ret;
 740 }
 741
 742 static void exynos_drm_exit(void)
 743 {
 744         exynos_drm_unregister_non_kms_drivers();
 745         exynos_drm_unregister_kms_drivers();
 746         exynos_drm_unregister_devices();
 747 }
 748
 749 module_init(exynos_drm_init);
 750 module_exit(exynos_drm_exit);
 751
 752 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
 753 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
 754 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
 755 MODULE_DESCRIPTION("Samsung SoC DRM Driver");
 756 MODULE_LICENSE("GPL");