drivers/media/platform/vsp1/vsp1_drv.c

   1 /*
   2  * vsp1_drv.c  --  R-Car VSP1 Driver
   3  *
   4  * Copyright (C) 2013-2015 Renesas Electronics Corporation
   5  *
   6  * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/clk.h>
  15 #include <linux/delay.h>
  16 #include <linux/device.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/module.h>
  19 #include <linux/of.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/videodev2.h>
  22
  23 #include "vsp1.h"
  24 #include "vsp1_bru.h"
  25 #include "vsp1_hsit.h"
  26 #include "vsp1_lif.h"
  27 #include "vsp1_lut.h"
  28 #include "vsp1_rwpf.h"
  29 #include "vsp1_sru.h"
  30 #include "vsp1_uds.h"
  31 #include "vsp1_video.h"
  32
  33 /* -----------------------------------------------------------------------------
  34  * Interrupt Handling
  35  */
  36
  37 static irqreturn_t vsp1_irq_handler(int irq, void *data)
  38 {
  39         u32 mask = VI6_WFP_IRQ_STA_DFE | VI6_WFP_IRQ_STA_FRE;
  40         struct vsp1_device *vsp1 = data;
  41         irqreturn_t ret = IRQ_NONE;
  42         unsigned int i;
  43
  44         for (i = 0; i < vsp1->pdata.wpf_count; ++i) {
  45                 struct vsp1_rwpf *wpf = vsp1->wpf[i];
  46                 struct vsp1_pipeline *pipe;
  47                 u32 status;
  48
  49                 if (wpf == NULL)
  50                         continue;
  51
  52                 pipe = to_vsp1_pipeline(&wpf->entity.subdev.entity);
  53                 status = vsp1_read(vsp1, VI6_WPF_IRQ_STA(i));
  54                 vsp1_write(vsp1, VI6_WPF_IRQ_STA(i), ~status & mask);
  55
  56                 if (status & VI6_WFP_IRQ_STA_FRE) {
  57                         vsp1_pipeline_frame_end(pipe);
  58                         ret = IRQ_HANDLED;
  59                 }
  60         }
  61
  62         return ret;
  63 }
  64
  65 /* -----------------------------------------------------------------------------
  66  * Entities
  67  */
  68
  69 /*
  70  * vsp1_create_links - Create links from all sources to the given sink
  71  *
  72  * This function creates media links from all valid sources to the given sink
  73  * pad. Links that would be invalid according to the VSP1 hardware capabilities
  74  * are skipped. Those include all links
  75  *
  76  * - from a UDS to a UDS (UDS entities can't be chained)
  77  * - from an entity to itself (no loops are allowed)
  78  */
  79 static int vsp1_create_links(struct vsp1_device *vsp1, struct vsp1_entity *sink)
  80 {
  81         struct media_entity *entity = &sink->subdev.entity;
  82         struct vsp1_entity *source;
  83         unsigned int pad;
  84         int ret;
  85
  86         if (sink->type == VSP1_ENTITY_RPF) {
  87                 struct vsp1_rwpf *rpf = to_rwpf(&sink->subdev);
  88
  89                 /* RPFs have no source entities, just connect their source pad
  90                  * to their video device.
  91                  */
  92                 return media_create_pad_link(&rpf->entity.video->video.entity,
  93                                              0, &rpf->entity.subdev.entity,
  94                                              RWPF_PAD_SINK,
  95                                              MEDIA_LNK_FL_ENABLED |
  96                                              MEDIA_LNK_FL_IMMUTABLE);
  97         }
  98
  99         list_for_each_entry(source, &vsp1->entities, list_dev) {
 100                 u32 flags;
 101
 102                 if (source->type == sink->type)
 103                         continue;
 104
 105                 if (source->type == VSP1_ENTITY_LIF ||
 106                     source->type == VSP1_ENTITY_WPF)
 107                         continue;
 108
 109                 flags = source->type == VSP1_ENTITY_RPF &&
 110                         sink->type == VSP1_ENTITY_WPF &&
 111                         source->index == sink->index
 112                       ? MEDIA_LNK_FL_ENABLED : 0;
 113
 114                 for (pad = 0; pad < entity->num_pads; ++pad) {
 115                         if (!(entity->pads[pad].flags & MEDIA_PAD_FL_SINK))
 116                                 continue;
 117
 118                         ret = media_create_pad_link(&source->subdev.entity,
 119                                                        source->source_pad,
 120                                                        entity, pad, flags);
 121                         if (ret < 0)
 122                                 return ret;
 123
 124                         if (flags & MEDIA_LNK_FL_ENABLED)
 125                                 source->sink = entity;
 126                 }
 127         }
 128
 129         if (sink->type == VSP1_ENTITY_WPF) {
 130                 struct vsp1_rwpf *wpf = to_rwpf(&sink->subdev);
 131                 unsigned int flags = MEDIA_LNK_FL_ENABLED;
 132
 133                 /* Connect the video device to the WPF. All connections are
 134                  * immutable except for the WPF0 source link if a LIF is
 135                  * present.
 136                  */
 137                 if (!(vsp1->pdata.features & VSP1_HAS_LIF) || sink->index != 0)
 138                         flags |= MEDIA_LNK_FL_IMMUTABLE;
 139
 140                 return media_create_pad_link(&wpf->entity.subdev.entity,
 141                                              RWPF_PAD_SOURCE,
 142                                              &wpf->entity.video->video.entity,
 143                                              0, flags);
 144         }
 145
 146         return 0;
 147 }
 148
 149 static void vsp1_destroy_entities(struct vsp1_device *vsp1)
 150 {
 151         struct vsp1_entity *entity, *_entity;
 152         struct vsp1_video *video, *_video;
 153
 154         list_for_each_entry_safe(entity, _entity, &vsp1->entities, list_dev) {
 155                 list_del(&entity->list_dev);
 156                 vsp1_entity_destroy(entity);
 157         }
 158
 159         list_for_each_entry_safe(video, _video, &vsp1->videos, list) {
 160                 list_del(&video->list);
 161                 vsp1_video_cleanup(video);
 162         }
 163
 164         v4l2_device_unregister(&vsp1->v4l2_dev);
 165         media_device_unregister(&vsp1->media_dev);
 166         media_device_cleanup(&vsp1->media_dev);
 167 }
 168
 169 static int vsp1_create_entities(struct vsp1_device *vsp1)
 170 {
 171         struct media_device *mdev = &vsp1->media_dev;
 172         struct v4l2_device *vdev = &vsp1->v4l2_dev;
 173         struct vsp1_entity *entity;
 174         unsigned int i;
 175         int ret;
 176
 177         mdev->dev = vsp1->dev;
 178         strlcpy(mdev->model, "VSP1", sizeof(mdev->model));
 179         snprintf(mdev->bus_info, sizeof(mdev->bus_info), "platform:%s",
 180                  dev_name(mdev->dev));
 181         media_device_init(mdev);
 182
 183         vdev->mdev = mdev;
 184         ret = v4l2_device_register(vsp1->dev, vdev);
 185         if (ret < 0) {
 186                 dev_err(vsp1->dev, "V4L2 device registration failed (%d)\n",
 187                         ret);
 188                 goto done;
 189         }
 190
 191         /* Instantiate all the entities. */
 192         vsp1->bru = vsp1_bru_create(vsp1);
 193         if (IS_ERR(vsp1->bru)) {
 194                 ret = PTR_ERR(vsp1->bru);
 195                 goto done;
 196         }
 197
 198         list_add_tail(&vsp1->bru->entity.list_dev, &vsp1->entities);
 199
 200         vsp1->hsi = vsp1_hsit_create(vsp1, true);
 201         if (IS_ERR(vsp1->hsi)) {
 202                 ret = PTR_ERR(vsp1->hsi);
 203                 goto done;
 204         }
 205
 206         list_add_tail(&vsp1->hsi->entity.list_dev, &vsp1->entities);
 207
 208         vsp1->hst = vsp1_hsit_create(vsp1, false);
 209         if (IS_ERR(vsp1->hst)) {
 210                 ret = PTR_ERR(vsp1->hst);
 211                 goto done;
 212         }
 213
 214         list_add_tail(&vsp1->hst->entity.list_dev, &vsp1->entities);
 215
 216         if (vsp1->pdata.features & VSP1_HAS_LIF) {
 217                 vsp1->lif = vsp1_lif_create(vsp1);
 218                 if (IS_ERR(vsp1->lif)) {
 219                         ret = PTR_ERR(vsp1->lif);
 220                         goto done;
 221                 }
 222
 223                 list_add_tail(&vsp1->lif->entity.list_dev, &vsp1->entities);
 224         }
 225
 226         if (vsp1->pdata.features & VSP1_HAS_LUT) {
 227                 vsp1->lut = vsp1_lut_create(vsp1);
 228                 if (IS_ERR(vsp1->lut)) {
 229                         ret = PTR_ERR(vsp1->lut);
 230                         goto done;
 231                 }
 232
 233                 list_add_tail(&vsp1->lut->entity.list_dev, &vsp1->entities);
 234         }
 235
 236         for (i = 0; i < vsp1->pdata.rpf_count; ++i) {
 237                 struct vsp1_video *video;
 238                 struct vsp1_rwpf *rpf;
 239
 240                 rpf = vsp1_rpf_create(vsp1, i);
 241                 if (IS_ERR(rpf)) {
 242                         ret = PTR_ERR(rpf);
 243                         goto done;
 244                 }
 245
 246                 vsp1->rpf[i] = rpf;
 247                 list_add_tail(&rpf->entity.list_dev, &vsp1->entities);
 248
 249                 video = vsp1_video_create(vsp1, rpf);
 250                 if (IS_ERR(video)) {
 251                         ret = PTR_ERR(video);
 252                         goto done;
 253                 }
 254
 255                 list_add_tail(&video->list, &vsp1->videos);
 256         }
 257
 258         if (vsp1->pdata.features & VSP1_HAS_SRU) {
 259                 vsp1->sru = vsp1_sru_create(vsp1);
 260                 if (IS_ERR(vsp1->sru)) {
 261                         ret = PTR_ERR(vsp1->sru);
 262                         goto done;
 263                 }
 264
 265                 list_add_tail(&vsp1->sru->entity.list_dev, &vsp1->entities);
 266         }
 267
 268         for (i = 0; i < vsp1->pdata.uds_count; ++i) {
 269                 struct vsp1_uds *uds;
 270
 271                 uds = vsp1_uds_create(vsp1, i);
 272                 if (IS_ERR(uds)) {
 273                         ret = PTR_ERR(uds);
 274                         goto done;
 275                 }
 276
 277                 vsp1->uds[i] = uds;
 278                 list_add_tail(&uds->entity.list_dev, &vsp1->entities);
 279         }
 280
 281         for (i = 0; i < vsp1->pdata.wpf_count; ++i) {
 282                 struct vsp1_video *video;
 283                 struct vsp1_rwpf *wpf;
 284
 285                 wpf = vsp1_wpf_create(vsp1, i);
 286                 if (IS_ERR(wpf)) {
 287                         ret = PTR_ERR(wpf);
 288                         goto done;
 289                 }
 290
 291                 vsp1->wpf[i] = wpf;
 292                 list_add_tail(&wpf->entity.list_dev, &vsp1->entities);
 293
 294                 video = vsp1_video_create(vsp1, wpf);
 295                 if (IS_ERR(video)) {
 296                         ret = PTR_ERR(video);
 297                         goto done;
 298                 }
 299
 300                 list_add_tail(&video->list, &vsp1->videos);
 301                 wpf->entity.sink = &video->video.entity;
 302         }
 303
 304         /* Register all subdevs. */
 305         list_for_each_entry(entity, &vsp1->entities, list_dev) {
 306                 ret = v4l2_device_register_subdev(&vsp1->v4l2_dev,
 307                                                   &entity->subdev);
 308                 if (ret < 0)
 309                         goto done;
 310         }
 311
 312         /* Create links. */
 313         list_for_each_entry(entity, &vsp1->entities, list_dev) {
 314                 if (entity->type == VSP1_ENTITY_LIF)
 315                         continue;
 316
 317                 ret = vsp1_create_links(vsp1, entity);
 318                 if (ret < 0)
 319                         goto done;
 320         }
 321
 322         if (vsp1->pdata.features & VSP1_HAS_LIF) {
 323                 ret = media_create_pad_link(
 324                         &vsp1->wpf[0]->entity.subdev.entity, RWPF_PAD_SOURCE,
 325                         &vsp1->lif->entity.subdev.entity, LIF_PAD_SINK, 0);
 326                 if (ret < 0)
 327                         return ret;
 328         }
 329
 330         ret = v4l2_device_register_subdev_nodes(&vsp1->v4l2_dev);
 331         if (ret < 0)
 332                 goto done;
 333
 334         ret = media_device_register(mdev);
 335
 336 done:
 337         if (ret < 0)
 338                 vsp1_destroy_entities(vsp1);
 339
 340         return ret;
 341 }
 342
 343 static int vsp1_device_init(struct vsp1_device *vsp1)
 344 {
 345         unsigned int i;
 346         u32 status;
 347
 348         /* Reset any channel that might be running. */
 349         status = vsp1_read(vsp1, VI6_STATUS);
 350
 351         for (i = 0; i < vsp1->pdata.wpf_count; ++i) {
 352                 unsigned int timeout;
 353
 354                 if (!(status & VI6_STATUS_SYS_ACT(i)))
 355                         continue;
 356
 357                 vsp1_write(vsp1, VI6_SRESET, VI6_SRESET_SRTS(i));
 358                 for (timeout = 10; timeout > 0; --timeout) {
 359                         status = vsp1_read(vsp1, VI6_STATUS);
 360                         if (!(status & VI6_STATUS_SYS_ACT(i)))
 361                                 break;
 362
 363                         usleep_range(1000, 2000);
 364                 }
 365
 366                 if (!timeout) {
 367                         dev_err(vsp1->dev, "failed to reset wpf.%u\n", i);
 368                         return -ETIMEDOUT;
 369                 }
 370         }
 371
 372         vsp1_write(vsp1, VI6_CLK_DCSWT, (8 << VI6_CLK_DCSWT_CSTPW_SHIFT) |
 373                    (8 << VI6_CLK_DCSWT_CSTRW_SHIFT));
 374
 375         for (i = 0; i < vsp1->pdata.rpf_count; ++i)
 376                 vsp1_write(vsp1, VI6_DPR_RPF_ROUTE(i), VI6_DPR_NODE_UNUSED);
 377
 378         for (i = 0; i < vsp1->pdata.uds_count; ++i)
 379                 vsp1_write(vsp1, VI6_DPR_UDS_ROUTE(i), VI6_DPR_NODE_UNUSED);
 380
 381         vsp1_write(vsp1, VI6_DPR_SRU_ROUTE, VI6_DPR_NODE_UNUSED);
 382         vsp1_write(vsp1, VI6_DPR_LUT_ROUTE, VI6_DPR_NODE_UNUSED);
 383         vsp1_write(vsp1, VI6_DPR_CLU_ROUTE, VI6_DPR_NODE_UNUSED);
 384         vsp1_write(vsp1, VI6_DPR_HST_ROUTE, VI6_DPR_NODE_UNUSED);
 385         vsp1_write(vsp1, VI6_DPR_HSI_ROUTE, VI6_DPR_NODE_UNUSED);
 386         vsp1_write(vsp1, VI6_DPR_BRU_ROUTE, VI6_DPR_NODE_UNUSED);
 387
 388         vsp1_write(vsp1, VI6_DPR_HGO_SMPPT, (7 << VI6_DPR_SMPPT_TGW_SHIFT) |
 389                    (VI6_DPR_NODE_UNUSED << VI6_DPR_SMPPT_PT_SHIFT));
 390         vsp1_write(vsp1, VI6_DPR_HGT_SMPPT, (7 << VI6_DPR_SMPPT_TGW_SHIFT) |
 391                    (VI6_DPR_NODE_UNUSED << VI6_DPR_SMPPT_PT_SHIFT));
 392
 393         return 0;
 394 }
 395
 396 /*
 397  * vsp1_device_get - Acquire the VSP1 device
 398  *
 399  * Increment the VSP1 reference count and initialize the device if the first
 400  * reference is taken.
 401  *
 402  * Return 0 on success or a negative error code otherwise.
 403  */
 404 int vsp1_device_get(struct vsp1_device *vsp1)
 405 {
 406         int ret = 0;
 407
 408         mutex_lock(&vsp1->lock);
 409         if (vsp1->ref_count > 0)
 410                 goto done;
 411
 412         ret = clk_prepare_enable(vsp1->clock);
 413         if (ret < 0)
 414                 goto done;
 415
 416         ret = vsp1_device_init(vsp1);
 417         if (ret < 0) {
 418                 clk_disable_unprepare(vsp1->clock);
 419                 goto done;
 420         }
 421
 422 done:
 423         if (!ret)
 424                 vsp1->ref_count++;
 425
 426         mutex_unlock(&vsp1->lock);
 427         return ret;
 428 }
 429
 430 /*
 431  * vsp1_device_put - Release the VSP1 device
 432  *
 433  * Decrement the VSP1 reference count and cleanup the device if the last
 434  * reference is released.
 435  */
 436 void vsp1_device_put(struct vsp1_device *vsp1)
 437 {
 438         mutex_lock(&vsp1->lock);
 439
 440         if (--vsp1->ref_count == 0)
 441                 clk_disable_unprepare(vsp1->clock);
 442
 443         mutex_unlock(&vsp1->lock);
 444 }
 445
 446 /* -----------------------------------------------------------------------------
 447  * Power Management
 448  */
 449
 450 #ifdef CONFIG_PM_SLEEP
 451 static int vsp1_pm_suspend(struct device *dev)
 452 {
 453         struct vsp1_device *vsp1 = dev_get_drvdata(dev);
 454
 455         WARN_ON(mutex_is_locked(&vsp1->lock));
 456
 457         if (vsp1->ref_count == 0)
 458                 return 0;
 459
 460         vsp1_pipelines_suspend(vsp1);
 461
 462         clk_disable_unprepare(vsp1->clock);
 463
 464         return 0;
 465 }
 466
 467 static int vsp1_pm_resume(struct device *dev)
 468 {
 469         struct vsp1_device *vsp1 = dev_get_drvdata(dev);
 470
 471         WARN_ON(mutex_is_locked(&vsp1->lock));
 472
 473         if (vsp1->ref_count == 0)
 474                 return 0;
 475
 476         clk_prepare_enable(vsp1->clock);
 477
 478         vsp1_pipelines_resume(vsp1);
 479
 480         return 0;
 481 }
 482 #endif
 483
 484 static const struct dev_pm_ops vsp1_pm_ops = {
 485         SET_SYSTEM_SLEEP_PM_OPS(vsp1_pm_suspend, vsp1_pm_resume)
 486 };
 487
 488 /* -----------------------------------------------------------------------------
 489  * Platform Driver
 490  */
 491
 492 static int vsp1_parse_dt(struct vsp1_device *vsp1)
 493 {
 494         struct device_node *np = vsp1->dev->of_node;
 495         struct vsp1_platform_data *pdata = &vsp1->pdata;
 496
 497         if (of_property_read_bool(np, "renesas,has-lif"))
 498                 pdata->features |= VSP1_HAS_LIF;
 499         if (of_property_read_bool(np, "renesas,has-lut"))
 500                 pdata->features |= VSP1_HAS_LUT;
 501         if (of_property_read_bool(np, "renesas,has-sru"))
 502                 pdata->features |= VSP1_HAS_SRU;
 503
 504         of_property_read_u32(np, "renesas,#rpf", &pdata->rpf_count);
 505         of_property_read_u32(np, "renesas,#uds", &pdata->uds_count);
 506         of_property_read_u32(np, "renesas,#wpf", &pdata->wpf_count);
 507
 508         if (pdata->rpf_count <= 0 || pdata->rpf_count > VSP1_MAX_RPF) {
 509                 dev_err(vsp1->dev, "invalid number of RPF (%u)\n",
 510                         pdata->rpf_count);
 511                 return -EINVAL;
 512         }
 513
 514         if (pdata->uds_count > VSP1_MAX_UDS) {
 515                 dev_err(vsp1->dev, "invalid number of UDS (%u)\n",
 516                         pdata->uds_count);
 517                 return -EINVAL;
 518         }
 519
 520         if (pdata->wpf_count <= 0 || pdata->wpf_count > VSP1_MAX_WPF) {
 521                 dev_err(vsp1->dev, "invalid number of WPF (%u)\n",
 522                         pdata->wpf_count);
 523                 return -EINVAL;
 524         }
 525
 526         return 0;
 527 }
 528
 529 static int vsp1_probe(struct platform_device *pdev)
 530 {
 531         struct vsp1_device *vsp1;
 532         struct resource *irq;
 533         struct resource *io;
 534         int ret;
 535
 536         vsp1 = devm_kzalloc(&pdev->dev, sizeof(*vsp1), GFP_KERNEL);
 537         if (vsp1 == NULL)
 538                 return -ENOMEM;
 539
 540         vsp1->dev = &pdev->dev;
 541         mutex_init(&vsp1->lock);
 542         INIT_LIST_HEAD(&vsp1->entities);
 543         INIT_LIST_HEAD(&vsp1->videos);
 544
 545         ret = vsp1_parse_dt(vsp1);
 546         if (ret < 0)
 547                 return ret;
 548
 549         /* I/O, IRQ and clock resources */
 550         io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 551         vsp1->mmio = devm_ioremap_resource(&pdev->dev, io);
 552         if (IS_ERR(vsp1->mmio))
 553                 return PTR_ERR(vsp1->mmio);
 554
 555         vsp1->clock = devm_clk_get(&pdev->dev, NULL);
 556         if (IS_ERR(vsp1->clock)) {
 557                 dev_err(&pdev->dev, "failed to get clock\n");
 558                 return PTR_ERR(vsp1->clock);
 559         }
 560
 561         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 562         if (!irq) {
 563                 dev_err(&pdev->dev, "missing IRQ\n");
 564                 return -EINVAL;
 565         }
 566
 567         ret = devm_request_irq(&pdev->dev, irq->start, vsp1_irq_handler,
 568                               IRQF_SHARED, dev_name(&pdev->dev), vsp1);
 569         if (ret < 0) {
 570                 dev_err(&pdev->dev, "failed to request IRQ\n");
 571                 return ret;
 572         }
 573
 574         /* Instanciate entities */
 575         ret = vsp1_create_entities(vsp1);
 576         if (ret < 0) {
 577                 dev_err(&pdev->dev, "failed to create entities\n");
 578                 return ret;
 579         }
 580
 581         platform_set_drvdata(pdev, vsp1);
 582
 583         return 0;
 584 }
 585
 586 static int vsp1_remove(struct platform_device *pdev)
 587 {
 588         struct vsp1_device *vsp1 = platform_get_drvdata(pdev);
 589
 590         vsp1_destroy_entities(vsp1);
 591
 592         return 0;
 593 }
 594
 595 static const struct of_device_id vsp1_of_match[] = {
 596         { .compatible = "renesas,vsp1" },
 597         { },
 598 };
 599
 600 static struct platform_driver vsp1_platform_driver = {
 601         .probe          = vsp1_probe,
 602         .remove         = vsp1_remove,
 603         .driver         = {
 604                 .name   = "vsp1",
 605                 .pm     = &vsp1_pm_ops,
 606                 .of_match_table = vsp1_of_match,
 607         },
 608 };
 609
 610 module_platform_driver(vsp1_platform_driver);
 611
 612 MODULE_ALIAS("vsp1");
 613 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
 614 MODULE_DESCRIPTION("Renesas VSP1 Driver");
 615 MODULE_LICENSE("GPL");