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
  32 /* -----------------------------------------------------------------------------
  33  * Interrupt Handling
  34  */
  35
  36 static irqreturn_t vsp1_irq_handler(int irq, void *data)
  37 {
  38         u32 mask = VI6_WFP_IRQ_STA_DFE | VI6_WFP_IRQ_STA_FRE;
  39         struct vsp1_device *vsp1 = data;
  40         irqreturn_t ret = IRQ_NONE;
  41         unsigned int i;
  42
  43         for (i = 0; i < vsp1->pdata.wpf_count; ++i) {
  44                 struct vsp1_rwpf *wpf = vsp1->wpf[i];
  45                 struct vsp1_pipeline *pipe;
  46                 u32 status;
  47
  48                 if (wpf == NULL)
  49                         continue;
  50
  51                 pipe = to_vsp1_pipeline(&wpf->entity.subdev.entity);
  52                 status = vsp1_read(vsp1, VI6_WPF_IRQ_STA(i));
  53                 vsp1_write(vsp1, VI6_WPF_IRQ_STA(i), ~status & mask);
  54
  55                 if (status & VI6_WFP_IRQ_STA_FRE) {
  56                         vsp1_pipeline_frame_end(pipe);
  57                         ret = IRQ_HANDLED;
  58                 }
  59         }
  60
  61         return ret;
  62 }
  63
  64 /* -----------------------------------------------------------------------------
  65  * Entities
  66  */
  67
  68 /*
  69  * vsp1_create_links - Create links from all sources to the given sink
  70  *
  71  * This function creates media links from all valid sources to the given sink
  72  * pad. Links that would be invalid according to the VSP1 hardware capabilities
  73  * are skipped. Those include all links
  74  *
  75  * - from a UDS to a UDS (UDS entities can't be chained)
  76  * - from an entity to itself (no loops are allowed)
  77  */
  78 static int vsp1_create_links(struct vsp1_device *vsp1, struct vsp1_entity *sink)
  79 {
  80         struct media_entity *entity = &sink->subdev.entity;
  81         struct vsp1_entity *source;
  82         unsigned int pad;
  83         int ret;
  84
  85         list_for_each_entry(source, &vsp1->entities, list_dev) {
  86                 u32 flags;
  87
  88                 if (source->type == sink->type)
  89                         continue;
  90
  91                 if (source->type == VSP1_ENTITY_LIF ||
  92                     source->type == VSP1_ENTITY_WPF)
  93                         continue;
  94
  95                 flags = source->type == VSP1_ENTITY_RPF &&
  96                         sink->type == VSP1_ENTITY_WPF &&
  97                         source->index == sink->index
  98                       ? MEDIA_LNK_FL_ENABLED : 0;
  99
 100                 for (pad = 0; pad < entity->num_pads; ++pad) {
 101                         if (!(entity->pads[pad].flags & MEDIA_PAD_FL_SINK))
 102                                 continue;
 103
 104                         ret = media_create_pad_link(&source->subdev.entity,
 105                                                        source->source_pad,
 106                                                        entity, pad, flags);
 107                         if (ret < 0)
 108                                 return ret;
 109
 110                         if (flags & MEDIA_LNK_FL_ENABLED)
 111                                 source->sink = entity;
 112                 }
 113         }
 114
 115         return 0;
 116 }
 117
 118 static void vsp1_destroy_entities(struct vsp1_device *vsp1)
 119 {
 120         struct vsp1_entity *entity;
 121         struct vsp1_entity *next;
 122
 123         list_for_each_entry_safe(entity, next, &vsp1->entities, list_dev) {
 124                 list_del(&entity->list_dev);
 125                 vsp1_entity_destroy(entity);
 126         }
 127
 128         v4l2_device_unregister(&vsp1->v4l2_dev);
 129         media_device_unregister(&vsp1->media_dev);
 130         media_device_cleanup(&vsp1->media_dev);
 131 }
 132
 133 static int vsp1_create_entities(struct vsp1_device *vsp1)
 134 {
 135         struct media_device *mdev = &vsp1->media_dev;
 136         struct v4l2_device *vdev = &vsp1->v4l2_dev;
 137         struct vsp1_entity *entity;
 138         unsigned int i;
 139         int ret;
 140
 141         mdev->dev = vsp1->dev;
 142         strlcpy(mdev->model, "VSP1", sizeof(mdev->model));
 143         snprintf(mdev->bus_info, sizeof(mdev->bus_info), "platform:%s",
 144                  dev_name(mdev->dev));
 145         media_device_init(mdev);
 146
 147         vdev->mdev = mdev;
 148         ret = v4l2_device_register(vsp1->dev, vdev);
 149         if (ret < 0) {
 150                 dev_err(vsp1->dev, "V4L2 device registration failed (%d)\n",
 151                         ret);
 152                 goto done;
 153         }
 154
 155         /* Instantiate all the entities. */
 156         vsp1->bru = vsp1_bru_create(vsp1);
 157         if (IS_ERR(vsp1->bru)) {
 158                 ret = PTR_ERR(vsp1->bru);
 159                 goto done;
 160         }
 161
 162         list_add_tail(&vsp1->bru->entity.list_dev, &vsp1->entities);
 163
 164         vsp1->hsi = vsp1_hsit_create(vsp1, true);
 165         if (IS_ERR(vsp1->hsi)) {
 166                 ret = PTR_ERR(vsp1->hsi);
 167                 goto done;
 168         }
 169
 170         list_add_tail(&vsp1->hsi->entity.list_dev, &vsp1->entities);
 171
 172         vsp1->hst = vsp1_hsit_create(vsp1, false);
 173         if (IS_ERR(vsp1->hst)) {
 174                 ret = PTR_ERR(vsp1->hst);
 175                 goto done;
 176         }
 177
 178         list_add_tail(&vsp1->hst->entity.list_dev, &vsp1->entities);
 179
 180         if (vsp1->pdata.features & VSP1_HAS_LIF) {
 181                 vsp1->lif = vsp1_lif_create(vsp1);
 182                 if (IS_ERR(vsp1->lif)) {
 183                         ret = PTR_ERR(vsp1->lif);
 184                         goto done;
 185                 }
 186
 187                 list_add_tail(&vsp1->lif->entity.list_dev, &vsp1->entities);
 188         }
 189
 190         if (vsp1->pdata.features & VSP1_HAS_LUT) {
 191                 vsp1->lut = vsp1_lut_create(vsp1);
 192                 if (IS_ERR(vsp1->lut)) {
 193                         ret = PTR_ERR(vsp1->lut);
 194                         goto done;
 195                 }
 196
 197                 list_add_tail(&vsp1->lut->entity.list_dev, &vsp1->entities);
 198         }
 199
 200         for (i = 0; i < vsp1->pdata.rpf_count; ++i) {
 201                 struct vsp1_rwpf *rpf;
 202
 203                 rpf = vsp1_rpf_create(vsp1, i);
 204                 if (IS_ERR(rpf)) {
 205                         ret = PTR_ERR(rpf);
 206                         goto done;
 207                 }
 208
 209                 vsp1->rpf[i] = rpf;
 210                 list_add_tail(&rpf->entity.list_dev, &vsp1->entities);
 211         }
 212
 213         if (vsp1->pdata.features & VSP1_HAS_SRU) {
 214                 vsp1->sru = vsp1_sru_create(vsp1);
 215                 if (IS_ERR(vsp1->sru)) {
 216                         ret = PTR_ERR(vsp1->sru);
 217                         goto done;
 218                 }
 219
 220                 list_add_tail(&vsp1->sru->entity.list_dev, &vsp1->entities);
 221         }
 222
 223         for (i = 0; i < vsp1->pdata.uds_count; ++i) {
 224                 struct vsp1_uds *uds;
 225
 226                 uds = vsp1_uds_create(vsp1, i);
 227                 if (IS_ERR(uds)) {
 228                         ret = PTR_ERR(uds);
 229                         goto done;
 230                 }
 231
 232                 vsp1->uds[i] = uds;
 233                 list_add_tail(&uds->entity.list_dev, &vsp1->entities);
 234         }
 235
 236         for (i = 0; i < vsp1->pdata.wpf_count; ++i) {
 237                 struct vsp1_rwpf *wpf;
 238
 239                 wpf = vsp1_wpf_create(vsp1, i);
 240                 if (IS_ERR(wpf)) {
 241                         ret = PTR_ERR(wpf);
 242                         goto done;
 243                 }
 244
 245                 vsp1->wpf[i] = wpf;
 246                 list_add_tail(&wpf->entity.list_dev, &vsp1->entities);
 247         }
 248
 249         /* Register all subdevs. */
 250         list_for_each_entry(entity, &vsp1->entities, list_dev) {
 251                 ret = v4l2_device_register_subdev(&vsp1->v4l2_dev,
 252                                                   &entity->subdev);
 253                 if (ret < 0)
 254                         goto done;
 255         }
 256
 257         /* Create links. */
 258         list_for_each_entry(entity, &vsp1->entities, list_dev) {
 259                 if (entity->type == VSP1_ENTITY_LIF) {
 260                         ret = vsp1_wpf_create_links(vsp1, entity);
 261                         if (ret < 0)
 262                                 goto done;
 263                 } else if (entity->type == VSP1_ENTITY_RPF) {
 264                         ret = vsp1_rpf_create_links(vsp1, entity);
 265                         if (ret < 0)
 266                                 goto done;
 267                 } else {
 268                         ret = vsp1_create_links(vsp1, entity);
 269                         if (ret < 0)
 270                                 goto done;
 271                 }
 272         }
 273
 274         if (vsp1->pdata.features & VSP1_HAS_LIF) {
 275                 ret = media_create_pad_link(
 276                         &vsp1->wpf[0]->entity.subdev.entity, RWPF_PAD_SOURCE,
 277                         &vsp1->lif->entity.subdev.entity, LIF_PAD_SINK, 0);
 278                 if (ret < 0)
 279                         return ret;
 280         }
 281
 282         ret = v4l2_device_register_subdev_nodes(&vsp1->v4l2_dev);
 283         if (ret < 0)
 284                 goto done;
 285
 286         ret = media_device_register(mdev);
 287
 288 done:
 289         if (ret < 0)
 290                 vsp1_destroy_entities(vsp1);
 291
 292         return ret;
 293 }
 294
 295 static int vsp1_device_init(struct vsp1_device *vsp1)
 296 {
 297         unsigned int i;
 298         u32 status;
 299
 300         /* Reset any channel that might be running. */
 301         status = vsp1_read(vsp1, VI6_STATUS);
 302
 303         for (i = 0; i < vsp1->pdata.wpf_count; ++i) {
 304                 unsigned int timeout;
 305
 306                 if (!(status & VI6_STATUS_SYS_ACT(i)))
 307                         continue;
 308
 309                 vsp1_write(vsp1, VI6_SRESET, VI6_SRESET_SRTS(i));
 310                 for (timeout = 10; timeout > 0; --timeout) {
 311                         status = vsp1_read(vsp1, VI6_STATUS);
 312                         if (!(status & VI6_STATUS_SYS_ACT(i)))
 313                                 break;
 314
 315                         usleep_range(1000, 2000);
 316                 }
 317
 318                 if (!timeout) {
 319                         dev_err(vsp1->dev, "failed to reset wpf.%u\n", i);
 320                         return -ETIMEDOUT;
 321                 }
 322         }
 323
 324         vsp1_write(vsp1, VI6_CLK_DCSWT, (8 << VI6_CLK_DCSWT_CSTPW_SHIFT) |
 325                    (8 << VI6_CLK_DCSWT_CSTRW_SHIFT));
 326
 327         for (i = 0; i < vsp1->pdata.rpf_count; ++i)
 328                 vsp1_write(vsp1, VI6_DPR_RPF_ROUTE(i), VI6_DPR_NODE_UNUSED);
 329
 330         for (i = 0; i < vsp1->pdata.uds_count; ++i)
 331                 vsp1_write(vsp1, VI6_DPR_UDS_ROUTE(i), VI6_DPR_NODE_UNUSED);
 332
 333         vsp1_write(vsp1, VI6_DPR_SRU_ROUTE, VI6_DPR_NODE_UNUSED);
 334         vsp1_write(vsp1, VI6_DPR_LUT_ROUTE, VI6_DPR_NODE_UNUSED);
 335         vsp1_write(vsp1, VI6_DPR_CLU_ROUTE, VI6_DPR_NODE_UNUSED);
 336         vsp1_write(vsp1, VI6_DPR_HST_ROUTE, VI6_DPR_NODE_UNUSED);
 337         vsp1_write(vsp1, VI6_DPR_HSI_ROUTE, VI6_DPR_NODE_UNUSED);
 338         vsp1_write(vsp1, VI6_DPR_BRU_ROUTE, VI6_DPR_NODE_UNUSED);
 339
 340         vsp1_write(vsp1, VI6_DPR_HGO_SMPPT, (7 << VI6_DPR_SMPPT_TGW_SHIFT) |
 341                    (VI6_DPR_NODE_UNUSED << VI6_DPR_SMPPT_PT_SHIFT));
 342         vsp1_write(vsp1, VI6_DPR_HGT_SMPPT, (7 << VI6_DPR_SMPPT_TGW_SHIFT) |
 343                    (VI6_DPR_NODE_UNUSED << VI6_DPR_SMPPT_PT_SHIFT));
 344
 345         return 0;
 346 }
 347
 348 /*
 349  * vsp1_device_get - Acquire the VSP1 device
 350  *
 351  * Increment the VSP1 reference count and initialize the device if the first
 352  * reference is taken.
 353  *
 354  * Return 0 on success or a negative error code otherwise.
 355  */
 356 int vsp1_device_get(struct vsp1_device *vsp1)
 357 {
 358         int ret = 0;
 359
 360         mutex_lock(&vsp1->lock);
 361         if (vsp1->ref_count > 0)
 362                 goto done;
 363
 364         ret = clk_prepare_enable(vsp1->clock);
 365         if (ret < 0)
 366                 goto done;
 367
 368         ret = vsp1_device_init(vsp1);
 369         if (ret < 0) {
 370                 clk_disable_unprepare(vsp1->clock);
 371                 goto done;
 372         }
 373
 374 done:
 375         if (!ret)
 376                 vsp1->ref_count++;
 377
 378         mutex_unlock(&vsp1->lock);
 379         return ret;
 380 }
 381
 382 /*
 383  * vsp1_device_put - Release the VSP1 device
 384  *
 385  * Decrement the VSP1 reference count and cleanup the device if the last
 386  * reference is released.
 387  */
 388 void vsp1_device_put(struct vsp1_device *vsp1)
 389 {
 390         mutex_lock(&vsp1->lock);
 391
 392         if (--vsp1->ref_count == 0)
 393                 clk_disable_unprepare(vsp1->clock);
 394
 395         mutex_unlock(&vsp1->lock);
 396 }
 397
 398 /* -----------------------------------------------------------------------------
 399  * Power Management
 400  */
 401
 402 #ifdef CONFIG_PM_SLEEP
 403 static int vsp1_pm_suspend(struct device *dev)
 404 {
 405         struct vsp1_device *vsp1 = dev_get_drvdata(dev);
 406
 407         WARN_ON(mutex_is_locked(&vsp1->lock));
 408
 409         if (vsp1->ref_count == 0)
 410                 return 0;
 411
 412         vsp1_pipelines_suspend(vsp1);
 413
 414         clk_disable_unprepare(vsp1->clock);
 415
 416         return 0;
 417 }
 418
 419 static int vsp1_pm_resume(struct device *dev)
 420 {
 421         struct vsp1_device *vsp1 = dev_get_drvdata(dev);
 422
 423         WARN_ON(mutex_is_locked(&vsp1->lock));
 424
 425         if (vsp1->ref_count == 0)
 426                 return 0;
 427
 428         clk_prepare_enable(vsp1->clock);
 429
 430         vsp1_pipelines_resume(vsp1);
 431
 432         return 0;
 433 }
 434 #endif
 435
 436 static const struct dev_pm_ops vsp1_pm_ops = {
 437         SET_SYSTEM_SLEEP_PM_OPS(vsp1_pm_suspend, vsp1_pm_resume)
 438 };
 439
 440 /* -----------------------------------------------------------------------------
 441  * Platform Driver
 442  */
 443
 444 static int vsp1_parse_dt(struct vsp1_device *vsp1)
 445 {
 446         struct device_node *np = vsp1->dev->of_node;
 447         struct vsp1_platform_data *pdata = &vsp1->pdata;
 448
 449         if (of_property_read_bool(np, "renesas,has-lif"))
 450                 pdata->features |= VSP1_HAS_LIF;
 451         if (of_property_read_bool(np, "renesas,has-lut"))
 452                 pdata->features |= VSP1_HAS_LUT;
 453         if (of_property_read_bool(np, "renesas,has-sru"))
 454                 pdata->features |= VSP1_HAS_SRU;
 455
 456         of_property_read_u32(np, "renesas,#rpf", &pdata->rpf_count);
 457         of_property_read_u32(np, "renesas,#uds", &pdata->uds_count);
 458         of_property_read_u32(np, "renesas,#wpf", &pdata->wpf_count);
 459
 460         if (pdata->rpf_count <= 0 || pdata->rpf_count > VSP1_MAX_RPF) {
 461                 dev_err(vsp1->dev, "invalid number of RPF (%u)\n",
 462                         pdata->rpf_count);
 463                 return -EINVAL;
 464         }
 465
 466         if (pdata->uds_count <= 0 || pdata->uds_count > VSP1_MAX_UDS) {
 467                 dev_err(vsp1->dev, "invalid number of UDS (%u)\n",
 468                         pdata->uds_count);
 469                 return -EINVAL;
 470         }
 471
 472         if (pdata->wpf_count <= 0 || pdata->wpf_count > VSP1_MAX_WPF) {
 473                 dev_err(vsp1->dev, "invalid number of WPF (%u)\n",
 474                         pdata->wpf_count);
 475                 return -EINVAL;
 476         }
 477
 478         return 0;
 479 }
 480
 481 static int vsp1_probe(struct platform_device *pdev)
 482 {
 483         struct vsp1_device *vsp1;
 484         struct resource *irq;
 485         struct resource *io;
 486         int ret;
 487
 488         vsp1 = devm_kzalloc(&pdev->dev, sizeof(*vsp1), GFP_KERNEL);
 489         if (vsp1 == NULL)
 490                 return -ENOMEM;
 491
 492         vsp1->dev = &pdev->dev;
 493         mutex_init(&vsp1->lock);
 494         INIT_LIST_HEAD(&vsp1->entities);
 495
 496         ret = vsp1_parse_dt(vsp1);
 497         if (ret < 0)
 498                 return ret;
 499
 500         /* I/O, IRQ and clock resources */
 501         io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 502         vsp1->mmio = devm_ioremap_resource(&pdev->dev, io);
 503         if (IS_ERR(vsp1->mmio))
 504                 return PTR_ERR(vsp1->mmio);
 505
 506         vsp1->clock = devm_clk_get(&pdev->dev, NULL);
 507         if (IS_ERR(vsp1->clock)) {
 508                 dev_err(&pdev->dev, "failed to get clock\n");
 509                 return PTR_ERR(vsp1->clock);
 510         }
 511
 512         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 513         if (!irq) {
 514                 dev_err(&pdev->dev, "missing IRQ\n");
 515                 return -EINVAL;
 516         }
 517
 518         ret = devm_request_irq(&pdev->dev, irq->start, vsp1_irq_handler,
 519                               IRQF_SHARED, dev_name(&pdev->dev), vsp1);
 520         if (ret < 0) {
 521                 dev_err(&pdev->dev, "failed to request IRQ\n");
 522                 return ret;
 523         }
 524
 525         /* Instanciate entities */
 526         ret = vsp1_create_entities(vsp1);
 527         if (ret < 0) {
 528                 dev_err(&pdev->dev, "failed to create entities\n");
 529                 return ret;
 530         }
 531
 532         platform_set_drvdata(pdev, vsp1);
 533
 534         return 0;
 535 }
 536
 537 static int vsp1_remove(struct platform_device *pdev)
 538 {
 539         struct vsp1_device *vsp1 = platform_get_drvdata(pdev);
 540
 541         vsp1_destroy_entities(vsp1);
 542
 543         return 0;
 544 }
 545
 546 static const struct of_device_id vsp1_of_match[] = {
 547         { .compatible = "renesas,vsp1" },
 548         { },
 549 };
 550
 551 static struct platform_driver vsp1_platform_driver = {
 552         .probe          = vsp1_probe,
 553         .remove         = vsp1_remove,
 554         .driver         = {
 555                 .name   = "vsp1",
 556                 .pm     = &vsp1_pm_ops,
 557                 .of_match_table = vsp1_of_match,
 558         },
 559 };
 560
 561 module_platform_driver(vsp1_platform_driver);
 562
 563 MODULE_ALIAS("vsp1");
 564 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
 565 MODULE_DESCRIPTION("Renesas VSP1 Driver");
 566 MODULE_LICENSE("GPL");