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 #ifdef CONFIG_PM_SLEEP
 308 static int exynos_drm_suspend(struct drm_device *dev, pm_message_t state)
 309 {
 310         struct drm_connector *connector;
 311
 312         drm_modeset_lock_all(dev);
 313         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 314                 int old_dpms = connector->dpms;
 315
 316                 if (connector->funcs->dpms)
 317                         connector->funcs->dpms(connector, DRM_MODE_DPMS_OFF);
 318
 319                 /* Set the old mode back to the connector for resume */
 320                 connector->dpms = old_dpms;
 321         }
 322         drm_modeset_unlock_all(dev);
 323
 324         return 0;
 325 }
 326
 327 static int exynos_drm_resume(struct drm_device *dev)
 328 {
 329         struct drm_connector *connector;
 330
 331         drm_modeset_lock_all(dev);
 332         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 333                 if (connector->funcs->dpms) {
 334                         int dpms = connector->dpms;
 335
 336                         connector->dpms = DRM_MODE_DPMS_OFF;
 337                         connector->funcs->dpms(connector, dpms);
 338                 }
 339         }
 340         drm_modeset_unlock_all(dev);
 341
 342         return 0;
 343 }
 344 #endif
 345
 346 static int exynos_drm_open(struct drm_device *dev, struct drm_file *file)
 347 {
 348         struct drm_exynos_file_private *file_priv;
 349         int ret;
 350
 351         file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL);
 352         if (!file_priv)
 353                 return -ENOMEM;
 354
 355         file->driver_priv = file_priv;
 356
 357         ret = exynos_drm_subdrv_open(dev, file);
 358         if (ret)
 359                 goto err_file_priv_free;
 360
 361         return ret;
 362
 363 err_file_priv_free:
 364         kfree(file_priv);
 365         file->driver_priv = NULL;
 366         return ret;
 367 }
 368
 369 static void exynos_drm_preclose(struct drm_device *dev,
 370                                         struct drm_file *file)
 371 {
 372         exynos_drm_subdrv_close(dev, file);
 373 }
 374
 375 static void exynos_drm_postclose(struct drm_device *dev, struct drm_file *file)
 376 {
 377         struct drm_pending_event *e, *et;
 378         unsigned long flags;
 379
 380         if (!file->driver_priv)
 381                 return;
 382
 383         spin_lock_irqsave(&dev->event_lock, flags);
 384         /* Release all events handled by page flip handler but not freed. */
 385         list_for_each_entry_safe(e, et, &file->event_list, link) {
 386                 list_del(&e->link);
 387                 e->destroy(e);
 388         }
 389         spin_unlock_irqrestore(&dev->event_lock, flags);
 390
 391         kfree(file->driver_priv);
 392         file->driver_priv = NULL;
 393 }
 394
 395 static void exynos_drm_lastclose(struct drm_device *dev)
 396 {
 397         exynos_drm_fbdev_restore_mode(dev);
 398 }
 399
 400 static const struct vm_operations_struct exynos_drm_gem_vm_ops = {
 401         .fault = exynos_drm_gem_fault,
 402         .open = drm_gem_vm_open,
 403         .close = drm_gem_vm_close,
 404 };
 405
 406 static const struct drm_ioctl_desc exynos_ioctls[] = {
 407         DRM_IOCTL_DEF_DRV(EXYNOS_GEM_CREATE, exynos_drm_gem_create_ioctl,
 408                         DRM_AUTH | DRM_RENDER_ALLOW),
 409         DRM_IOCTL_DEF_DRV(EXYNOS_GEM_GET, exynos_drm_gem_get_ioctl,
 410                         DRM_RENDER_ALLOW),
 411         DRM_IOCTL_DEF_DRV(EXYNOS_VIDI_CONNECTION, vidi_connection_ioctl,
 412                         DRM_AUTH),
 413         DRM_IOCTL_DEF_DRV(EXYNOS_G2D_GET_VER, exynos_g2d_get_ver_ioctl,
 414                         DRM_AUTH | DRM_RENDER_ALLOW),
 415         DRM_IOCTL_DEF_DRV(EXYNOS_G2D_SET_CMDLIST, exynos_g2d_set_cmdlist_ioctl,
 416                         DRM_AUTH | DRM_RENDER_ALLOW),
 417         DRM_IOCTL_DEF_DRV(EXYNOS_G2D_EXEC, exynos_g2d_exec_ioctl,
 418                         DRM_AUTH | DRM_RENDER_ALLOW),
 419         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_GET_PROPERTY, exynos_drm_ipp_get_property,
 420                         DRM_AUTH | DRM_RENDER_ALLOW),
 421         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_SET_PROPERTY, exynos_drm_ipp_set_property,
 422                         DRM_AUTH | DRM_RENDER_ALLOW),
 423         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_QUEUE_BUF, exynos_drm_ipp_queue_buf,
 424                         DRM_AUTH | DRM_RENDER_ALLOW),
 425         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_CMD_CTRL, exynos_drm_ipp_cmd_ctrl,
 426                         DRM_AUTH | DRM_RENDER_ALLOW),
 427 };
 428
 429 static const struct file_operations exynos_drm_driver_fops = {
 430         .owner          = THIS_MODULE,
 431         .open           = drm_open,
 432         .mmap           = exynos_drm_gem_mmap,
 433         .poll           = drm_poll,
 434         .read           = drm_read,
 435         .unlocked_ioctl = drm_ioctl,
 436 #ifdef CONFIG_COMPAT
 437         .compat_ioctl = drm_compat_ioctl,
 438 #endif
 439         .release        = drm_release,
 440 };
 441
 442 static struct drm_driver exynos_drm_driver = {
 443         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME
 444                                   | DRIVER_ATOMIC | DRIVER_RENDER,
 445         .load                   = exynos_drm_load,
 446         .unload                 = exynos_drm_unload,
 447         .open                   = exynos_drm_open,
 448         .preclose               = exynos_drm_preclose,
 449         .lastclose              = exynos_drm_lastclose,
 450         .postclose              = exynos_drm_postclose,
 451         .set_busid              = drm_platform_set_busid,
 452         .get_vblank_counter     = drm_vblank_no_hw_counter,
 453         .enable_vblank          = exynos_drm_crtc_enable_vblank,
 454         .disable_vblank         = exynos_drm_crtc_disable_vblank,
 455         .gem_free_object        = exynos_drm_gem_free_object,
 456         .gem_vm_ops             = &exynos_drm_gem_vm_ops,
 457         .dumb_create            = exynos_drm_gem_dumb_create,
 458         .dumb_map_offset        = exynos_drm_gem_dumb_map_offset,
 459         .dumb_destroy           = drm_gem_dumb_destroy,
 460         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 461         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 462         .gem_prime_export       = drm_gem_prime_export,
 463         .gem_prime_import       = drm_gem_prime_import,
 464         .gem_prime_get_sg_table = exynos_drm_gem_prime_get_sg_table,
 465         .gem_prime_import_sg_table      = exynos_drm_gem_prime_import_sg_table,
 466         .gem_prime_vmap         = exynos_drm_gem_prime_vmap,
 467         .gem_prime_vunmap       = exynos_drm_gem_prime_vunmap,
 468         .ioctls                 = exynos_ioctls,
 469         .num_ioctls             = ARRAY_SIZE(exynos_ioctls),
 470         .fops                   = &exynos_drm_driver_fops,
 471         .name   = DRIVER_NAME,
 472         .desc   = DRIVER_DESC,
 473         .date   = DRIVER_DATE,
 474         .major  = DRIVER_MAJOR,
 475         .minor  = DRIVER_MINOR,
 476 };
 477
 478 #ifdef CONFIG_PM_SLEEP
 479 static int exynos_drm_sys_suspend(struct device *dev)
 480 {
 481         struct drm_device *drm_dev = dev_get_drvdata(dev);
 482         pm_message_t message;
 483
 484         if (pm_runtime_suspended(dev) || !drm_dev)
 485                 return 0;
 486
 487         message.event = PM_EVENT_SUSPEND;
 488         return exynos_drm_suspend(drm_dev, message);
 489 }
 490
 491 static int exynos_drm_sys_resume(struct device *dev)
 492 {
 493         struct drm_device *drm_dev = dev_get_drvdata(dev);
 494
 495         if (pm_runtime_suspended(dev) || !drm_dev)
 496                 return 0;
 497
 498         return exynos_drm_resume(drm_dev);
 499 }
 500 #endif
 501
 502 static const struct dev_pm_ops exynos_drm_pm_ops = {
 503         SET_SYSTEM_SLEEP_PM_OPS(exynos_drm_sys_suspend, exynos_drm_sys_resume)
 504 };
 505
 506 /* forward declaration */
 507 static struct platform_driver exynos_drm_platform_driver;
 508
 509 /*
 510  * Connector drivers should not be placed before associated crtc drivers,
 511  * because connector requires pipe number of its crtc during initialization.
 512  */
 513 static struct platform_driver *const exynos_drm_kms_drivers[] = {
 514 #ifdef CONFIG_DRM_EXYNOS_FIMD
 515         &fimd_driver,
 516 #endif
 517 #ifdef CONFIG_DRM_EXYNOS5433_DECON
 518         &exynos5433_decon_driver,
 519 #endif
 520 #ifdef CONFIG_DRM_EXYNOS7_DECON
 521         &decon_driver,
 522 #endif
 523 #ifdef CONFIG_DRM_EXYNOS_MIC
 524         &mic_driver,
 525 #endif
 526 #ifdef CONFIG_DRM_EXYNOS_DP
 527         &dp_driver,
 528 #endif
 529 #ifdef CONFIG_DRM_EXYNOS_DSI
 530         &dsi_driver,
 531 #endif
 532 #ifdef CONFIG_DRM_EXYNOS_MIXER
 533         &mixer_driver,
 534 #endif
 535 #ifdef CONFIG_DRM_EXYNOS_HDMI
 536         &hdmi_driver,
 537 #endif
 538 #ifdef CONFIG_DRM_EXYNOS_VIDI
 539         &vidi_driver,
 540 #endif
 541 };
 542
 543 static struct platform_driver *const exynos_drm_non_kms_drivers[] = {
 544 #ifdef CONFIG_DRM_EXYNOS_G2D
 545         &g2d_driver,
 546 #endif
 547 #ifdef CONFIG_DRM_EXYNOS_FIMC
 548         &fimc_driver,
 549 #endif
 550 #ifdef CONFIG_DRM_EXYNOS_ROTATOR
 551         &rotator_driver,
 552 #endif
 553 #ifdef CONFIG_DRM_EXYNOS_GSC
 554         &gsc_driver,
 555 #endif
 556 #ifdef CONFIG_DRM_EXYNOS_IPP
 557         &ipp_driver,
 558 #endif
 559         &exynos_drm_platform_driver,
 560 };
 561
 562 static struct platform_driver *const exynos_drm_drv_with_simple_dev[] = {
 563 #ifdef CONFIG_DRM_EXYNOS_VIDI
 564         &vidi_driver,
 565 #endif
 566 #ifdef CONFIG_DRM_EXYNOS_IPP
 567         &ipp_driver,
 568 #endif
 569         &exynos_drm_platform_driver,
 570 };
 571 #define PDEV_COUNT ARRAY_SIZE(exynos_drm_drv_with_simple_dev)
 572
 573 static int compare_dev(struct device *dev, void *data)
 574 {
 575         return dev == (struct device *)data;
 576 }
 577
 578 static struct component_match *exynos_drm_match_add(struct device *dev)
 579 {
 580         struct component_match *match = NULL;
 581         int i;
 582
 583         for (i = 0; i < ARRAY_SIZE(exynos_drm_kms_drivers); ++i) {
 584                 struct device_driver *drv = &exynos_drm_kms_drivers[i]->driver;
 585                 struct device *p = NULL, *d;
 586
 587                 while ((d = bus_find_device(&platform_bus_type, p, drv,
 588                                             (void *)platform_bus_type.match))) {
 589                         put_device(p);
 590                         component_match_add(dev, &match, compare_dev, d);
 591                         p = d;
 592                 }
 593                 put_device(p);
 594         }
 595
 596         return match ?: ERR_PTR(-ENODEV);
 597 }
 598
 599 static int exynos_drm_bind(struct device *dev)
 600 {
 601         return drm_platform_init(&exynos_drm_driver, to_platform_device(dev));
 602 }
 603
 604 static void exynos_drm_unbind(struct device *dev)
 605 {
 606         drm_put_dev(dev_get_drvdata(dev));
 607 }
 608
 609 static const struct component_master_ops exynos_drm_ops = {
 610         .bind           = exynos_drm_bind,
 611         .unbind         = exynos_drm_unbind,
 612 };
 613
 614 static int exynos_drm_platform_probe(struct platform_device *pdev)
 615 {
 616         struct component_match *match;
 617
 618         pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 619         exynos_drm_driver.num_ioctls = ARRAY_SIZE(exynos_ioctls);
 620
 621         match = exynos_drm_match_add(&pdev->dev);
 622         if (IS_ERR(match))
 623                 return PTR_ERR(match);
 624
 625         return component_master_add_with_match(&pdev->dev, &exynos_drm_ops,
 626                                                match);
 627 }
 628
 629 static int exynos_drm_platform_remove(struct platform_device *pdev)
 630 {
 631         component_master_del(&pdev->dev, &exynos_drm_ops);
 632         return 0;
 633 }
 634
 635 static struct platform_driver exynos_drm_platform_driver = {
 636         .probe  = exynos_drm_platform_probe,
 637         .remove = exynos_drm_platform_remove,
 638         .driver = {
 639                 .name   = "exynos-drm",
 640                 .pm     = &exynos_drm_pm_ops,
 641         },
 642 };
 643
 644 static struct platform_device *exynos_drm_pdevs[PDEV_COUNT];
 645
 646 static void exynos_drm_unregister_devices(void)
 647 {
 648         int i = PDEV_COUNT;
 649
 650         while (--i >= 0) {
 651                 platform_device_unregister(exynos_drm_pdevs[i]);
 652                 exynos_drm_pdevs[i] = NULL;
 653         }
 654 }
 655
 656 static int exynos_drm_register_devices(void)
 657 {
 658         int i;
 659
 660         for (i = 0; i < PDEV_COUNT; ++i) {
 661                 struct platform_driver *d = exynos_drm_drv_with_simple_dev[i];
 662                 struct platform_device *pdev =
 663                         platform_device_register_simple(d->driver.name, -1,
 664                                                         NULL, 0);
 665
 666                 if (!IS_ERR(pdev)) {
 667                         exynos_drm_pdevs[i] = pdev;
 668                         continue;
 669                 }
 670                 while (--i >= 0) {
 671                         platform_device_unregister(exynos_drm_pdevs[i]);
 672                         exynos_drm_pdevs[i] = NULL;
 673                 }
 674
 675                 return PTR_ERR(pdev);
 676         }
 677
 678         return 0;
 679 }
 680
 681 static void exynos_drm_unregister_drivers(struct platform_driver * const *drv,
 682                                           int count)
 683 {
 684         while (--count >= 0)
 685                 platform_driver_unregister(drv[count]);
 686 }
 687
 688 static int exynos_drm_register_drivers(struct platform_driver * const *drv,
 689                                        int count)
 690 {
 691         int i, ret;
 692
 693         for (i = 0; i < count; ++i) {
 694                 ret = platform_driver_register(drv[i]);
 695                 if (!ret)
 696                         continue;
 697
 698                 while (--i >= 0)
 699                         platform_driver_unregister(drv[i]);
 700
 701                 return ret;
 702         }
 703
 704         return 0;
 705 }
 706
 707 static inline int exynos_drm_register_kms_drivers(void)
 708 {
 709         return exynos_drm_register_drivers(exynos_drm_kms_drivers,
 710                                         ARRAY_SIZE(exynos_drm_kms_drivers));
 711 }
 712
 713 static inline int exynos_drm_register_non_kms_drivers(void)
 714 {
 715         return exynos_drm_register_drivers(exynos_drm_non_kms_drivers,
 716                                         ARRAY_SIZE(exynos_drm_non_kms_drivers));
 717 }
 718
 719 static inline void exynos_drm_unregister_kms_drivers(void)
 720 {
 721         exynos_drm_unregister_drivers(exynos_drm_kms_drivers,
 722                                         ARRAY_SIZE(exynos_drm_kms_drivers));
 723 }
 724
 725 static inline void exynos_drm_unregister_non_kms_drivers(void)
 726 {
 727         exynos_drm_unregister_drivers(exynos_drm_non_kms_drivers,
 728                                         ARRAY_SIZE(exynos_drm_non_kms_drivers));
 729 }
 730
 731 static int exynos_drm_init(void)
 732 {
 733         int ret;
 734
 735         ret = exynos_drm_register_devices();
 736         if (ret)
 737                 return ret;
 738
 739         ret = exynos_drm_register_kms_drivers();
 740         if (ret)
 741                 goto err_unregister_pdevs;
 742
 743         ret = exynos_drm_register_non_kms_drivers();
 744         if (ret)
 745                 goto err_unregister_kms_drivers;
 746
 747         return 0;
 748
 749 err_unregister_kms_drivers:
 750         exynos_drm_unregister_kms_drivers();
 751
 752 err_unregister_pdevs:
 753         exynos_drm_unregister_devices();
 754
 755         return ret;
 756 }
 757
 758 static void exynos_drm_exit(void)
 759 {
 760         exynos_drm_unregister_non_kms_drivers();
 761         exynos_drm_unregister_kms_drivers();
 762         exynos_drm_unregister_devices();
 763 }
 764
 765 module_init(exynos_drm_init);
 766 module_exit(exynos_drm_exit);
 767
 768 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
 769 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
 770 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
 771 MODULE_DESCRIPTION("Samsung SoC DRM Driver");
 772 MODULE_LICENSE("GPL");