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, 0);
 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 struct device *exynos_drm_get_dma_device(void);
 134
 135 static int exynos_drm_load(struct drm_device *dev, unsigned long flags)
 136 {
 137         struct exynos_drm_private *private;
 138         struct drm_encoder *encoder;
 139         unsigned int clone_mask;
 140         int cnt, ret;
 141
 142         private = kzalloc(sizeof(struct exynos_drm_private), GFP_KERNEL);
 143         if (!private)
 144                 return -ENOMEM;
 145
 146         init_waitqueue_head(&private->wait);
 147         spin_lock_init(&private->lock);
 148
 149         dev_set_drvdata(dev->dev, dev);
 150         dev->dev_private = (void *)private;
 151
 152         /* the first real CRTC device is used for all dma mapping operations */
 153         private->dma_dev = exynos_drm_get_dma_device();
 154         if (!private->dma_dev) {
 155                 DRM_ERROR("no device found for DMA mapping operations.\n");
 156                 ret = -ENODEV;
 157                 goto err_free_private;
 158         }
 159         DRM_INFO("Exynos DRM: using %s device for DMA mapping operations\n",
 160                  dev_name(private->dma_dev));
 161
 162         /* create common IOMMU mapping for all devices attached to Exynos DRM */
 163         ret = drm_create_iommu_mapping(dev);
 164         if (ret < 0) {
 165                 DRM_ERROR("failed to create iommu mapping.\n");
 166                 goto err_free_private;
 167         }
 168
 169         drm_mode_config_init(dev);
 170
 171         exynos_drm_mode_config_init(dev);
 172
 173         /* setup possible_clones. */
 174         cnt = 0;
 175         clone_mask = 0;
 176         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 177                 clone_mask |= (1 << (cnt++));
 178
 179         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
 180                 encoder->possible_clones = clone_mask;
 181
 182         platform_set_drvdata(dev->platformdev, dev);
 183
 184         /* Try to bind all sub drivers. */
 185         ret = component_bind_all(dev->dev, dev);
 186         if (ret)
 187                 goto err_mode_config_cleanup;
 188
 189         ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
 190         if (ret)
 191                 goto err_unbind_all;
 192
 193         /* Probe non kms sub drivers and virtual display driver. */
 194         ret = exynos_drm_device_subdrv_probe(dev);
 195         if (ret)
 196                 goto err_cleanup_vblank;
 197
 198         drm_mode_config_reset(dev);
 199
 200         /*
 201          * enable drm irq mode.
 202          * - with irq_enabled = true, we can use the vblank feature.
 203          *
 204          * P.S. note that we wouldn't use drm irq handler but
 205          *      just specific driver own one instead because
 206          *      drm framework supports only one irq handler.
 207          */
 208         dev->irq_enabled = 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 nonblock)
 262 {
 263         struct exynos_drm_private *priv = dev->dev_private;
 264         struct exynos_atomic_commit *commit;
 265         struct drm_crtc *crtc;
 266         struct drm_crtc_state *crtc_state;
 267         int i, ret;
 268
 269         commit = kzalloc(sizeof(*commit), GFP_KERNEL);
 270         if (!commit)
 271                 return -ENOMEM;
 272
 273         ret = drm_atomic_helper_prepare_planes(dev, state);
 274         if (ret) {
 275                 kfree(commit);
 276                 return ret;
 277         }
 278
 279         /* This is the point of no return */
 280
 281         INIT_WORK(&commit->work, exynos_drm_atomic_work);
 282         commit->dev = dev;
 283         commit->state = state;
 284
 285         /* Wait until all affected CRTCs have completed previous commits and
 286          * mark them as pending.
 287          */
 288         for_each_crtc_in_state(state, crtc, crtc_state, i)
 289                 commit->crtcs |= drm_crtc_mask(crtc);
 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(state, true);
 298
 299         if (nonblock)
 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         struct drm_crtc *crtc;
 334
 335         exynos_drm_subdrv_close(dev, file);
 336
 337         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
 338                 exynos_drm_crtc_cancel_page_flip(crtc, file);
 339 }
 340
 341 static void exynos_drm_postclose(struct drm_device *dev, struct drm_file *file)
 342 {
 343         kfree(file->driver_priv);
 344         file->driver_priv = NULL;
 345 }
 346
 347 static void exynos_drm_lastclose(struct drm_device *dev)
 348 {
 349         exynos_drm_fbdev_restore_mode(dev);
 350 }
 351
 352 static const struct vm_operations_struct exynos_drm_gem_vm_ops = {
 353         .fault = exynos_drm_gem_fault,
 354         .open = drm_gem_vm_open,
 355         .close = drm_gem_vm_close,
 356 };
 357
 358 static const struct drm_ioctl_desc exynos_ioctls[] = {
 359         DRM_IOCTL_DEF_DRV(EXYNOS_GEM_CREATE, exynos_drm_gem_create_ioctl,
 360                         DRM_AUTH | DRM_RENDER_ALLOW),
 361         DRM_IOCTL_DEF_DRV(EXYNOS_GEM_MAP, exynos_drm_gem_map_ioctl,
 362                         DRM_AUTH | DRM_RENDER_ALLOW),
 363         DRM_IOCTL_DEF_DRV(EXYNOS_GEM_GET, exynos_drm_gem_get_ioctl,
 364                         DRM_RENDER_ALLOW),
 365         DRM_IOCTL_DEF_DRV(EXYNOS_VIDI_CONNECTION, vidi_connection_ioctl,
 366                         DRM_AUTH),
 367         DRM_IOCTL_DEF_DRV(EXYNOS_G2D_GET_VER, exynos_g2d_get_ver_ioctl,
 368                         DRM_AUTH | DRM_RENDER_ALLOW),
 369         DRM_IOCTL_DEF_DRV(EXYNOS_G2D_SET_CMDLIST, exynos_g2d_set_cmdlist_ioctl,
 370                         DRM_AUTH | DRM_RENDER_ALLOW),
 371         DRM_IOCTL_DEF_DRV(EXYNOS_G2D_EXEC, exynos_g2d_exec_ioctl,
 372                         DRM_AUTH | DRM_RENDER_ALLOW),
 373         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_GET_PROPERTY, exynos_drm_ipp_get_property,
 374                         DRM_AUTH | DRM_RENDER_ALLOW),
 375         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_SET_PROPERTY, exynos_drm_ipp_set_property,
 376                         DRM_AUTH | DRM_RENDER_ALLOW),
 377         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_QUEUE_BUF, exynos_drm_ipp_queue_buf,
 378                         DRM_AUTH | DRM_RENDER_ALLOW),
 379         DRM_IOCTL_DEF_DRV(EXYNOS_IPP_CMD_CTRL, exynos_drm_ipp_cmd_ctrl,
 380                         DRM_AUTH | DRM_RENDER_ALLOW),
 381 };
 382
 383 static const struct file_operations exynos_drm_driver_fops = {
 384         .owner          = THIS_MODULE,
 385         .open           = drm_open,
 386         .mmap           = exynos_drm_gem_mmap,
 387         .poll           = drm_poll,
 388         .read           = drm_read,
 389         .unlocked_ioctl = drm_ioctl,
 390 #ifdef CONFIG_COMPAT
 391         .compat_ioctl = drm_compat_ioctl,
 392 #endif
 393         .release        = drm_release,
 394 };
 395
 396 static struct drm_driver exynos_drm_driver = {
 397         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME
 398                                   | DRIVER_ATOMIC | DRIVER_RENDER,
 399         .load                   = exynos_drm_load,
 400         .unload                 = exynos_drm_unload,
 401         .open                   = exynos_drm_open,
 402         .preclose               = exynos_drm_preclose,
 403         .lastclose              = exynos_drm_lastclose,
 404         .postclose              = exynos_drm_postclose,
 405         .get_vblank_counter     = drm_vblank_no_hw_counter,
 406         .enable_vblank          = exynos_drm_crtc_enable_vblank,
 407         .disable_vblank         = exynos_drm_crtc_disable_vblank,
 408         .gem_free_object_unlocked = exynos_drm_gem_free_object,
 409         .gem_vm_ops             = &exynos_drm_gem_vm_ops,
 410         .dumb_create            = exynos_drm_gem_dumb_create,
 411         .dumb_map_offset        = exynos_drm_gem_dumb_map_offset,
 412         .dumb_destroy           = drm_gem_dumb_destroy,
 413         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 414         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 415         .gem_prime_export       = drm_gem_prime_export,
 416         .gem_prime_import       = drm_gem_prime_import,
 417         .gem_prime_get_sg_table = exynos_drm_gem_prime_get_sg_table,
 418         .gem_prime_import_sg_table      = exynos_drm_gem_prime_import_sg_table,
 419         .gem_prime_vmap         = exynos_drm_gem_prime_vmap,
 420         .gem_prime_vunmap       = exynos_drm_gem_prime_vunmap,
 421         .gem_prime_mmap         = exynos_drm_gem_prime_mmap,
 422         .ioctls                 = exynos_ioctls,
 423         .num_ioctls             = ARRAY_SIZE(exynos_ioctls),
 424         .fops                   = &exynos_drm_driver_fops,
 425         .name   = DRIVER_NAME,
 426         .desc   = DRIVER_DESC,
 427         .date   = DRIVER_DATE,
 428         .major  = DRIVER_MAJOR,
 429         .minor  = DRIVER_MINOR,
 430 };
 431
 432 #ifdef CONFIG_PM_SLEEP
 433 static int exynos_drm_suspend(struct device *dev)
 434 {
 435         struct drm_device *drm_dev = dev_get_drvdata(dev);
 436         struct drm_connector *connector;
 437
 438         if (pm_runtime_suspended(dev) || !drm_dev)
 439                 return 0;
 440
 441         drm_modeset_lock_all(drm_dev);
 442         drm_for_each_connector(connector, drm_dev) {
 443                 int old_dpms = connector->dpms;
 444
 445                 if (connector->funcs->dpms)
 446                         connector->funcs->dpms(connector, DRM_MODE_DPMS_OFF);
 447
 448                 /* Set the old mode back to the connector for resume */
 449                 connector->dpms = old_dpms;
 450         }
 451         drm_modeset_unlock_all(drm_dev);
 452
 453         return 0;
 454 }
 455
 456 static int exynos_drm_resume(struct device *dev)
 457 {
 458         struct drm_device *drm_dev = dev_get_drvdata(dev);
 459         struct drm_connector *connector;
 460
 461         if (pm_runtime_suspended(dev) || !drm_dev)
 462                 return 0;
 463
 464         drm_modeset_lock_all(drm_dev);
 465         drm_for_each_connector(connector, drm_dev) {
 466                 if (connector->funcs->dpms) {
 467                         int dpms = connector->dpms;
 468
 469                         connector->dpms = DRM_MODE_DPMS_OFF;
 470                         connector->funcs->dpms(connector, dpms);
 471                 }
 472         }
 473         drm_modeset_unlock_all(drm_dev);
 474
 475         return 0;
 476 }
 477 #endif
 478
 479 static const struct dev_pm_ops exynos_drm_pm_ops = {
 480         SET_SYSTEM_SLEEP_PM_OPS(exynos_drm_suspend, exynos_drm_resume)
 481 };
 482
 483 /* forward declaration */
 484 static struct platform_driver exynos_drm_platform_driver;
 485
 486 struct exynos_drm_driver_info {
 487         struct platform_driver *driver;
 488         unsigned int flags;
 489 };
 490
 491 #define DRM_COMPONENT_DRIVER    BIT(0)  /* supports component framework */
 492 #define DRM_VIRTUAL_DEVICE      BIT(1)  /* create virtual platform device */
 493 #define DRM_DMA_DEVICE          BIT(2)  /* can be used for dma allocations */
 494
 495 #define DRV_PTR(drv, cond) (IS_ENABLED(cond) ? &drv : NULL)
 496
 497 /*
 498  * Connector drivers should not be placed before associated crtc drivers,
 499  * because connector requires pipe number of its crtc during initialization.
 500  */
 501 static struct exynos_drm_driver_info exynos_drm_drivers[] = {
 502         {
 503                 DRV_PTR(fimd_driver, CONFIG_DRM_EXYNOS_FIMD),
 504                 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
 505         }, {
 506                 DRV_PTR(exynos5433_decon_driver, CONFIG_DRM_EXYNOS5433_DECON),
 507                 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
 508         }, {
 509                 DRV_PTR(decon_driver, CONFIG_DRM_EXYNOS7_DECON),
 510                 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
 511         }, {
 512                 DRV_PTR(mixer_driver, CONFIG_DRM_EXYNOS_MIXER),
 513                 DRM_COMPONENT_DRIVER | DRM_DMA_DEVICE
 514         }, {
 515                 DRV_PTR(mic_driver, CONFIG_DRM_EXYNOS_MIC),
 516                 DRM_COMPONENT_DRIVER
 517         }, {
 518                 DRV_PTR(dp_driver, CONFIG_DRM_EXYNOS_DP),
 519                 DRM_COMPONENT_DRIVER
 520         }, {
 521                 DRV_PTR(dsi_driver, CONFIG_DRM_EXYNOS_DSI),
 522                 DRM_COMPONENT_DRIVER
 523         }, {
 524                 DRV_PTR(hdmi_driver, CONFIG_DRM_EXYNOS_HDMI),
 525                 DRM_COMPONENT_DRIVER
 526         }, {
 527                 DRV_PTR(vidi_driver, CONFIG_DRM_EXYNOS_VIDI),
 528                 DRM_COMPONENT_DRIVER | DRM_VIRTUAL_DEVICE
 529         }, {
 530                 DRV_PTR(g2d_driver, CONFIG_DRM_EXYNOS_G2D),
 531         }, {
 532                 DRV_PTR(fimc_driver, CONFIG_DRM_EXYNOS_FIMC),
 533         }, {
 534                 DRV_PTR(rotator_driver, CONFIG_DRM_EXYNOS_ROTATOR),
 535         }, {
 536                 DRV_PTR(gsc_driver, CONFIG_DRM_EXYNOS_GSC),
 537         }, {
 538                 DRV_PTR(ipp_driver, CONFIG_DRM_EXYNOS_IPP),
 539                 DRM_VIRTUAL_DEVICE
 540         }, {
 541                 &exynos_drm_platform_driver,
 542                 DRM_VIRTUAL_DEVICE
 543         }
 544 };
 545
 546 static int compare_dev(struct device *dev, void *data)
 547 {
 548         return dev == (struct device *)data;
 549 }
 550
 551 static struct component_match *exynos_drm_match_add(struct device *dev)
 552 {
 553         struct component_match *match = NULL;
 554         int i;
 555
 556         for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
 557                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
 558                 struct device *p = NULL, *d;
 559
 560                 if (!info->driver || !(info->flags & DRM_COMPONENT_DRIVER))
 561                         continue;
 562
 563                 while ((d = bus_find_device(&platform_bus_type, p,
 564                                             &info->driver->driver,
 565                                             (void *)platform_bus_type.match))) {
 566                         put_device(p);
 567                         component_match_add(dev, &match, compare_dev, d);
 568                         p = d;
 569                 }
 570                 put_device(p);
 571         }
 572
 573         return match ?: ERR_PTR(-ENODEV);
 574 }
 575
 576 static int exynos_drm_bind(struct device *dev)
 577 {
 578         return drm_platform_init(&exynos_drm_driver, to_platform_device(dev));
 579 }
 580
 581 static void exynos_drm_unbind(struct device *dev)
 582 {
 583         drm_put_dev(dev_get_drvdata(dev));
 584 }
 585
 586 static const struct component_master_ops exynos_drm_ops = {
 587         .bind           = exynos_drm_bind,
 588         .unbind         = exynos_drm_unbind,
 589 };
 590
 591 static int exynos_drm_platform_probe(struct platform_device *pdev)
 592 {
 593         struct component_match *match;
 594
 595         pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 596         exynos_drm_driver.num_ioctls = ARRAY_SIZE(exynos_ioctls);
 597
 598         match = exynos_drm_match_add(&pdev->dev);
 599         if (IS_ERR(match))
 600                 return PTR_ERR(match);
 601
 602         return component_master_add_with_match(&pdev->dev, &exynos_drm_ops,
 603                                                match);
 604 }
 605
 606 static int exynos_drm_platform_remove(struct platform_device *pdev)
 607 {
 608         component_master_del(&pdev->dev, &exynos_drm_ops);
 609         return 0;
 610 }
 611
 612 static struct platform_driver exynos_drm_platform_driver = {
 613         .probe  = exynos_drm_platform_probe,
 614         .remove = exynos_drm_platform_remove,
 615         .driver = {
 616                 .name   = "exynos-drm",
 617                 .pm     = &exynos_drm_pm_ops,
 618         },
 619 };
 620
 621 static struct device *exynos_drm_get_dma_device(void)
 622 {
 623         int i;
 624
 625         for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
 626                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
 627                 struct device *dev;
 628
 629                 if (!info->driver || !(info->flags & DRM_DMA_DEVICE))
 630                         continue;
 631
 632                 while ((dev = bus_find_device(&platform_bus_type, NULL,
 633                                             &info->driver->driver,
 634                                             (void *)platform_bus_type.match))) {
 635                         put_device(dev);
 636                         return dev;
 637                 }
 638         }
 639         return NULL;
 640 }
 641
 642 static void exynos_drm_unregister_devices(void)
 643 {
 644         int i;
 645
 646         for (i = ARRAY_SIZE(exynos_drm_drivers) - 1; i >= 0; --i) {
 647                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
 648                 struct device *dev;
 649
 650                 if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE))
 651                         continue;
 652
 653                 while ((dev = bus_find_device(&platform_bus_type, NULL,
 654                                             &info->driver->driver,
 655                                             (void *)platform_bus_type.match))) {
 656                         put_device(dev);
 657                         platform_device_unregister(to_platform_device(dev));
 658                 }
 659         }
 660 }
 661
 662 static int exynos_drm_register_devices(void)
 663 {
 664         struct platform_device *pdev;
 665         int i;
 666
 667         for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
 668                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
 669
 670                 if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE))
 671                         continue;
 672
 673                 pdev = platform_device_register_simple(
 674                                         info->driver->driver.name, -1, NULL, 0);
 675                 if (IS_ERR(pdev))
 676                         goto fail;
 677         }
 678
 679         return 0;
 680 fail:
 681         exynos_drm_unregister_devices();
 682         return PTR_ERR(pdev);
 683 }
 684
 685 static void exynos_drm_unregister_drivers(void)
 686 {
 687         int i;
 688
 689         for (i = ARRAY_SIZE(exynos_drm_drivers) - 1; i >= 0; --i) {
 690                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
 691
 692                 if (!info->driver)
 693                         continue;
 694
 695                 platform_driver_unregister(info->driver);
 696         }
 697 }
 698
 699 static int exynos_drm_register_drivers(void)
 700 {
 701         int i, ret;
 702
 703         for (i = 0; i < ARRAY_SIZE(exynos_drm_drivers); ++i) {
 704                 struct exynos_drm_driver_info *info = &exynos_drm_drivers[i];
 705
 706                 if (!info->driver)
 707                         continue;
 708
 709                 ret = platform_driver_register(info->driver);
 710                 if (ret)
 711                         goto fail;
 712         }
 713         return 0;
 714 fail:
 715         exynos_drm_unregister_drivers();
 716         return ret;
 717 }
 718
 719 static int exynos_drm_init(void)
 720 {
 721         int ret;
 722
 723         ret = exynos_drm_register_devices();
 724         if (ret)
 725                 return ret;
 726
 727         ret = exynos_drm_register_drivers();
 728         if (ret)
 729                 goto err_unregister_pdevs;
 730
 731         return 0;
 732
 733 err_unregister_pdevs:
 734         exynos_drm_unregister_devices();
 735
 736         return ret;
 737 }
 738
 739 static void exynos_drm_exit(void)
 740 {
 741         exynos_drm_unregister_drivers();
 742         exynos_drm_unregister_devices();
 743 }
 744
 745 module_init(exynos_drm_init);
 746 module_exit(exynos_drm_exit);
 747
 748 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
 749 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
 750 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
 751 MODULE_DESCRIPTION("Samsung SoC DRM Driver");
 752 MODULE_LICENSE("GPL");