drivers/media/platform/xilinx/xilinx-vipp.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Xilinx Video IP Composite Device
   4  *
   5  * Copyright (C) 2013-2015 Ideas on Board
   6  * Copyright (C) 2013-2015 Xilinx, Inc.
   7  *
   8  * Contacts: Hyun Kwon <hyun.kwon@xilinx.com>
   9  *           Laurent Pinchart <laurent.pinchart@ideasonboard.com>
  10  */
  11
  12 #include <linux/list.h>
  13 #include <linux/module.h>
  14 #include <linux/of.h>
  15 #include <linux/of_graph.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/slab.h>
  18
  19 #include <media/v4l2-async.h>
  20 #include <media/v4l2-common.h>
  21 #include <media/v4l2-device.h>
  22 #include <media/v4l2-fwnode.h>
  23
  24 #include "xilinx-dma.h"
  25 #include "xilinx-vipp.h"
  26
  27 #define XVIPP_DMA_S2MM                          0
  28 #define XVIPP_DMA_MM2S                          1
  29
  30 /**
  31  * struct xvip_graph_entity - Entity in the video graph
  32  * @asd: subdev asynchronous registration information
  33  * @entity: media entity, from the corresponding V4L2 subdev
  34  * @subdev: V4L2 subdev
  35  */
  36 struct xvip_graph_entity {
  37         struct v4l2_async_connection asd; /* must be first */
  38         struct media_entity *entity;
  39         struct v4l2_subdev *subdev;
  40 };
  41
  42 static inline struct xvip_graph_entity *
  43 to_xvip_entity(struct v4l2_async_connection *asd)
  44 {
  45         return container_of(asd, struct xvip_graph_entity, asd);
  46 }
  47
  48 /* -----------------------------------------------------------------------------
  49  * Graph Management
  50  */
  51
  52 static struct xvip_graph_entity *
  53 xvip_graph_find_entity(struct xvip_composite_device *xdev,
  54                        const struct fwnode_handle *fwnode)
  55 {
  56         struct xvip_graph_entity *entity;
  57         struct v4l2_async_connection *asd;
  58
  59         list_for_each_entry(asd, &xdev->notifier.done_list, asc_entry) {
  60                 entity = to_xvip_entity(asd);
  61                 if (entity->asd.match.fwnode == fwnode)
  62                         return entity;
  63         }
  64
  65         return NULL;
  66 }
  67
  68 static int xvip_graph_build_one(struct xvip_composite_device *xdev,
  69                                 struct xvip_graph_entity *entity)
  70 {
  71         u32 link_flags = MEDIA_LNK_FL_ENABLED;
  72         struct media_entity *local = entity->entity;
  73         struct media_entity *remote;
  74         struct media_pad *local_pad;
  75         struct media_pad *remote_pad;
  76         struct xvip_graph_entity *ent;
  77         struct v4l2_fwnode_link link;
  78         struct fwnode_handle *ep = NULL;
  79         int ret = 0;
  80
  81         dev_dbg(xdev->dev, "creating links for entity %s\n", local->name);
  82
  83         while (1) {
  84                 /* Get the next endpoint and parse its link. */
  85                 ep = fwnode_graph_get_next_endpoint(entity->asd.match.fwnode,
  86                                                     ep);
  87                 if (ep == NULL)
  88                         break;
  89
  90                 dev_dbg(xdev->dev, "processing endpoint %p\n", ep);
  91
  92                 ret = v4l2_fwnode_parse_link(ep, &link);
  93                 if (ret < 0) {
  94                         dev_err(xdev->dev, "failed to parse link for %p\n",
  95                                 ep);
  96                         continue;
  97                 }
  98
  99                 /* Skip sink ports, they will be processed from the other end of
 100                  * the link.
 101                  */
 102                 if (link.local_port >= local->num_pads) {
 103                         dev_err(xdev->dev, "invalid port number %u for %p\n",
 104                                 link.local_port, link.local_node);
 105                         v4l2_fwnode_put_link(&link);
 106                         ret = -EINVAL;
 107                         break;
 108                 }
 109
 110                 local_pad = &local->pads[link.local_port];
 111
 112                 if (local_pad->flags & MEDIA_PAD_FL_SINK) {
 113                         dev_dbg(xdev->dev, "skipping sink port %p:%u\n",
 114                                 link.local_node, link.local_port);
 115                         v4l2_fwnode_put_link(&link);
 116                         continue;
 117                 }
 118
 119                 /* Skip DMA engines, they will be processed separately. */
 120                 if (link.remote_node == of_fwnode_handle(xdev->dev->of_node)) {
 121                         dev_dbg(xdev->dev, "skipping DMA port %p:%u\n",
 122                                 link.local_node, link.local_port);
 123                         v4l2_fwnode_put_link(&link);
 124                         continue;
 125                 }
 126
 127                 /* Find the remote entity. */
 128                 ent = xvip_graph_find_entity(xdev, link.remote_node);
 129                 if (ent == NULL) {
 130                         dev_err(xdev->dev, "no entity found for %p\n",
 131                                 link.remote_node);
 132                         v4l2_fwnode_put_link(&link);
 133                         ret = -ENODEV;
 134                         break;
 135                 }
 136
 137                 remote = ent->entity;
 138
 139                 if (link.remote_port >= remote->num_pads) {
 140                         dev_err(xdev->dev, "invalid port number %u on %p\n",
 141                                 link.remote_port, link.remote_node);
 142                         v4l2_fwnode_put_link(&link);
 143                         ret = -EINVAL;
 144                         break;
 145                 }
 146
 147                 remote_pad = &remote->pads[link.remote_port];
 148
 149                 v4l2_fwnode_put_link(&link);
 150
 151                 /* Create the media link. */
 152                 dev_dbg(xdev->dev, "creating %s:%u -> %s:%u link\n",
 153                         local->name, local_pad->index,
 154                         remote->name, remote_pad->index);
 155
 156                 ret = media_create_pad_link(local, local_pad->index,
 157                                                remote, remote_pad->index,
 158                                                link_flags);
 159                 if (ret < 0) {
 160                         dev_err(xdev->dev,
 161                                 "failed to create %s:%u -> %s:%u link\n",
 162                                 local->name, local_pad->index,
 163                                 remote->name, remote_pad->index);
 164                         break;
 165                 }
 166         }
 167
 168         fwnode_handle_put(ep);
 169         return ret;
 170 }
 171
 172 static struct xvip_dma *
 173 xvip_graph_find_dma(struct xvip_composite_device *xdev, unsigned int port)
 174 {
 175         struct xvip_dma *dma;
 176
 177         list_for_each_entry(dma, &xdev->dmas, list) {
 178                 if (dma->port == port)
 179                         return dma;
 180         }
 181
 182         return NULL;
 183 }
 184
 185 static int xvip_graph_build_dma(struct xvip_composite_device *xdev)
 186 {
 187         u32 link_flags = MEDIA_LNK_FL_ENABLED;
 188         struct device_node *node = xdev->dev->of_node;
 189         struct media_entity *source;
 190         struct media_entity *sink;
 191         struct media_pad *source_pad;
 192         struct media_pad *sink_pad;
 193         struct xvip_graph_entity *ent;
 194         struct v4l2_fwnode_link link;
 195         struct device_node *ep = NULL;
 196         struct xvip_dma *dma;
 197         int ret = 0;
 198
 199         dev_dbg(xdev->dev, "creating links for DMA engines\n");
 200
 201         while (1) {
 202                 /* Get the next endpoint and parse its link. */
 203                 ep = of_graph_get_next_endpoint(node, ep);
 204                 if (ep == NULL)
 205                         break;
 206
 207                 dev_dbg(xdev->dev, "processing endpoint %pOF\n", ep);
 208
 209                 ret = v4l2_fwnode_parse_link(of_fwnode_handle(ep), &link);
 210                 if (ret < 0) {
 211                         dev_err(xdev->dev, "failed to parse link for %pOF\n",
 212                                 ep);
 213                         continue;
 214                 }
 215
 216                 /* Find the DMA engine. */
 217                 dma = xvip_graph_find_dma(xdev, link.local_port);
 218                 if (dma == NULL) {
 219                         dev_err(xdev->dev, "no DMA engine found for port %u\n",
 220                                 link.local_port);
 221                         v4l2_fwnode_put_link(&link);
 222                         ret = -EINVAL;
 223                         break;
 224                 }
 225
 226                 dev_dbg(xdev->dev, "creating link for DMA engine %s\n",
 227                         dma->video.name);
 228
 229                 /* Find the remote entity. */
 230                 ent = xvip_graph_find_entity(xdev, link.remote_node);
 231                 if (ent == NULL) {
 232                         dev_err(xdev->dev, "no entity found for %pOF\n",
 233                                 to_of_node(link.remote_node));
 234                         v4l2_fwnode_put_link(&link);
 235                         ret = -ENODEV;
 236                         break;
 237                 }
 238
 239                 if (link.remote_port >= ent->entity->num_pads) {
 240                         dev_err(xdev->dev, "invalid port number %u on %pOF\n",
 241                                 link.remote_port,
 242                                 to_of_node(link.remote_node));
 243                         v4l2_fwnode_put_link(&link);
 244                         ret = -EINVAL;
 245                         break;
 246                 }
 247
 248                 if (dma->pad.flags & MEDIA_PAD_FL_SOURCE) {
 249                         source = &dma->video.entity;
 250                         source_pad = &dma->pad;
 251                         sink = ent->entity;
 252                         sink_pad = &sink->pads[link.remote_port];
 253                 } else {
 254                         source = ent->entity;
 255                         source_pad = &source->pads[link.remote_port];
 256                         sink = &dma->video.entity;
 257                         sink_pad = &dma->pad;
 258                 }
 259
 260                 v4l2_fwnode_put_link(&link);
 261
 262                 /* Create the media link. */
 263                 dev_dbg(xdev->dev, "creating %s:%u -> %s:%u link\n",
 264                         source->name, source_pad->index,
 265                         sink->name, sink_pad->index);
 266
 267                 ret = media_create_pad_link(source, source_pad->index,
 268                                                sink, sink_pad->index,
 269                                                link_flags);
 270                 if (ret < 0) {
 271                         dev_err(xdev->dev,
 272                                 "failed to create %s:%u -> %s:%u link\n",
 273                                 source->name, source_pad->index,
 274                                 sink->name, sink_pad->index);
 275                         break;
 276                 }
 277         }
 278
 279         of_node_put(ep);
 280         return ret;
 281 }
 282
 283 static int xvip_graph_notify_complete(struct v4l2_async_notifier *notifier)
 284 {
 285         struct xvip_composite_device *xdev =
 286                 container_of(notifier, struct xvip_composite_device, notifier);
 287         struct xvip_graph_entity *entity;
 288         struct v4l2_async_connection *asd;
 289         int ret;
 290
 291         dev_dbg(xdev->dev, "notify complete, all subdevs registered\n");
 292
 293         /* Create links for every entity. */
 294         list_for_each_entry(asd, &xdev->notifier.done_list, asc_entry) {
 295                 entity = to_xvip_entity(asd);
 296                 ret = xvip_graph_build_one(xdev, entity);
 297                 if (ret < 0)
 298                         return ret;
 299         }
 300
 301         /* Create links for DMA channels. */
 302         ret = xvip_graph_build_dma(xdev);
 303         if (ret < 0)
 304                 return ret;
 305
 306         ret = v4l2_device_register_subdev_nodes(&xdev->v4l2_dev);
 307         if (ret < 0)
 308                 dev_err(xdev->dev, "failed to register subdev nodes\n");
 309
 310         return media_device_register(&xdev->media_dev);
 311 }
 312
 313 static int xvip_graph_notify_bound(struct v4l2_async_notifier *notifier,
 314                                    struct v4l2_subdev *subdev,
 315                                    struct v4l2_async_connection *asc)
 316 {
 317         struct xvip_graph_entity *entity = to_xvip_entity(asc);
 318
 319         entity->entity = &subdev->entity;
 320         entity->subdev = subdev;
 321
 322         return 0;
 323 }
 324
 325 static const struct v4l2_async_notifier_operations xvip_graph_notify_ops = {
 326         .bound = xvip_graph_notify_bound,
 327         .complete = xvip_graph_notify_complete,
 328 };
 329
 330 static int xvip_graph_parse_one(struct xvip_composite_device *xdev,
 331                                 struct fwnode_handle *fwnode)
 332 {
 333         struct fwnode_handle *remote;
 334         struct fwnode_handle *ep = NULL;
 335         int ret = 0;
 336
 337         dev_dbg(xdev->dev, "parsing node %p\n", fwnode);
 338
 339         while (1) {
 340                 struct xvip_graph_entity *xge;
 341
 342                 ep = fwnode_graph_get_next_endpoint(fwnode, ep);
 343                 if (ep == NULL)
 344                         break;
 345
 346                 dev_dbg(xdev->dev, "handling endpoint %p\n", ep);
 347
 348                 remote = fwnode_graph_get_remote_port_parent(ep);
 349                 if (remote == NULL) {
 350                         ret = -EINVAL;
 351                         goto err_notifier_cleanup;
 352                 }
 353
 354                 fwnode_handle_put(ep);
 355
 356                 /* Skip entities that we have already processed. */
 357                 if (remote == of_fwnode_handle(xdev->dev->of_node) ||
 358                     xvip_graph_find_entity(xdev, remote)) {
 359                         fwnode_handle_put(remote);
 360                         continue;
 361                 }
 362
 363                 xge = v4l2_async_nf_add_fwnode(&xdev->notifier, remote,
 364                                                struct xvip_graph_entity);
 365                 fwnode_handle_put(remote);
 366                 if (IS_ERR(xge)) {
 367                         ret = PTR_ERR(xge);
 368                         goto err_notifier_cleanup;
 369                 }
 370         }
 371
 372         return 0;
 373
 374 err_notifier_cleanup:
 375         v4l2_async_nf_cleanup(&xdev->notifier);
 376         fwnode_handle_put(ep);
 377         return ret;
 378 }
 379
 380 static int xvip_graph_parse(struct xvip_composite_device *xdev)
 381 {
 382         struct xvip_graph_entity *entity;
 383         struct v4l2_async_connection *asd;
 384         int ret;
 385
 386         /*
 387          * Walk the links to parse the full graph. Start by parsing the
 388          * composite node and then parse entities in turn. The list_for_each
 389          * loop will handle entities added at the end of the list while walking
 390          * the links.
 391          */
 392         ret = xvip_graph_parse_one(xdev, of_fwnode_handle(xdev->dev->of_node));
 393         if (ret < 0)
 394                 return 0;
 395
 396         list_for_each_entry(asd, &xdev->notifier.waiting_list, asc_entry) {
 397                 entity = to_xvip_entity(asd);
 398                 ret = xvip_graph_parse_one(xdev, entity->asd.match.fwnode);
 399                 if (ret < 0) {
 400                         v4l2_async_nf_cleanup(&xdev->notifier);
 401                         break;
 402                 }
 403         }
 404
 405         return ret;
 406 }
 407
 408 static int xvip_graph_dma_init_one(struct xvip_composite_device *xdev,
 409                                    struct device_node *node)
 410 {
 411         struct xvip_dma *dma;
 412         enum v4l2_buf_type type;
 413         const char *direction;
 414         unsigned int index;
 415         int ret;
 416
 417         ret = of_property_read_string(node, "direction", &direction);
 418         if (ret < 0)
 419                 return ret;
 420
 421         if (strcmp(direction, "input") == 0)
 422                 type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 423         else if (strcmp(direction, "output") == 0)
 424                 type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
 425         else
 426                 return -EINVAL;
 427
 428         of_property_read_u32(node, "reg", &index);
 429
 430         dma = devm_kzalloc(xdev->dev, sizeof(*dma), GFP_KERNEL);
 431         if (dma == NULL)
 432                 return -ENOMEM;
 433
 434         ret = xvip_dma_init(xdev, dma, type, index);
 435         if (ret < 0) {
 436                 dev_err(xdev->dev, "%pOF initialization failed\n", node);
 437                 return ret;
 438         }
 439
 440         list_add_tail(&dma->list, &xdev->dmas);
 441
 442         xdev->v4l2_caps |= type == V4L2_BUF_TYPE_VIDEO_CAPTURE
 443                          ? V4L2_CAP_VIDEO_CAPTURE : V4L2_CAP_VIDEO_OUTPUT;
 444
 445         return 0;
 446 }
 447
 448 static int xvip_graph_dma_init(struct xvip_composite_device *xdev)
 449 {
 450         struct device_node *ports;
 451         struct device_node *port;
 452         int ret = 0;
 453
 454         ports = of_get_child_by_name(xdev->dev->of_node, "ports");
 455         if (ports == NULL) {
 456                 dev_err(xdev->dev, "ports node not present\n");
 457                 return -EINVAL;
 458         }
 459
 460         for_each_child_of_node(ports, port) {
 461                 ret = xvip_graph_dma_init_one(xdev, port);
 462                 if (ret) {
 463                         of_node_put(port);
 464                         break;
 465                 }
 466         }
 467
 468         of_node_put(ports);
 469         return ret;
 470 }
 471
 472 static void xvip_graph_cleanup(struct xvip_composite_device *xdev)
 473 {
 474         struct xvip_dma *dmap;
 475         struct xvip_dma *dma;
 476
 477         v4l2_async_nf_unregister(&xdev->notifier);
 478         v4l2_async_nf_cleanup(&xdev->notifier);
 479
 480         list_for_each_entry_safe(dma, dmap, &xdev->dmas, list) {
 481                 xvip_dma_cleanup(dma);
 482                 list_del(&dma->list);
 483         }
 484 }
 485
 486 static int xvip_graph_init(struct xvip_composite_device *xdev)
 487 {
 488         int ret;
 489
 490         /* Init the DMA channels. */
 491         ret = xvip_graph_dma_init(xdev);
 492         if (ret < 0) {
 493                 dev_err(xdev->dev, "DMA initialization failed\n");
 494                 goto done;
 495         }
 496
 497         v4l2_async_nf_init(&xdev->notifier);
 498
 499         /* Parse the graph to extract a list of subdevice DT nodes. */
 500         ret = xvip_graph_parse(xdev);
 501         if (ret < 0) {
 502                 dev_err(xdev->dev, "graph parsing failed\n");
 503                 goto done;
 504         }
 505
 506         if (list_empty(&xdev->notifier.waiting_list)) {
 507                 dev_err(xdev->dev, "no subdev found in graph\n");
 508                 ret = -ENOENT;
 509                 goto done;
 510         }
 511
 512         /* Register the subdevices notifier. */
 513         xdev->notifier.ops = &xvip_graph_notify_ops;
 514
 515         ret = v4l2_async_nf_register(&xdev->v4l2_dev, &xdev->notifier);
 516         if (ret < 0) {
 517                 dev_err(xdev->dev, "notifier registration failed\n");
 518                 goto done;
 519         }
 520
 521         ret = 0;
 522
 523 done:
 524         if (ret < 0)
 525                 xvip_graph_cleanup(xdev);
 526
 527         return ret;
 528 }
 529
 530 /* -----------------------------------------------------------------------------
 531  * Media Controller and V4L2
 532  */
 533
 534 static void xvip_composite_v4l2_cleanup(struct xvip_composite_device *xdev)
 535 {
 536         v4l2_device_unregister(&xdev->v4l2_dev);
 537         media_device_unregister(&xdev->media_dev);
 538         media_device_cleanup(&xdev->media_dev);
 539 }
 540
 541 static int xvip_composite_v4l2_init(struct xvip_composite_device *xdev)
 542 {
 543         int ret;
 544
 545         xdev->media_dev.dev = xdev->dev;
 546         strscpy(xdev->media_dev.model, "Xilinx Video Composite Device",
 547                 sizeof(xdev->media_dev.model));
 548         xdev->media_dev.hw_revision = 0;
 549
 550         media_device_init(&xdev->media_dev);
 551
 552         xdev->v4l2_dev.mdev = &xdev->media_dev;
 553         ret = v4l2_device_register(xdev->dev, &xdev->v4l2_dev);
 554         if (ret < 0) {
 555                 dev_err(xdev->dev, "V4L2 device registration failed (%d)\n",
 556                         ret);
 557                 media_device_cleanup(&xdev->media_dev);
 558                 return ret;
 559         }
 560
 561         return 0;
 562 }
 563
 564 /* -----------------------------------------------------------------------------
 565  * Platform Device Driver
 566  */
 567
 568 static int xvip_composite_probe(struct platform_device *pdev)
 569 {
 570         struct xvip_composite_device *xdev;
 571         int ret;
 572
 573         xdev = devm_kzalloc(&pdev->dev, sizeof(*xdev), GFP_KERNEL);
 574         if (!xdev)
 575                 return -ENOMEM;
 576
 577         xdev->dev = &pdev->dev;
 578         INIT_LIST_HEAD(&xdev->dmas);
 579
 580         ret = xvip_composite_v4l2_init(xdev);
 581         if (ret < 0)
 582                 return ret;
 583
 584         ret = xvip_graph_init(xdev);
 585         if (ret < 0)
 586                 goto error;
 587
 588         platform_set_drvdata(pdev, xdev);
 589
 590         dev_info(xdev->dev, "device registered\n");
 591
 592         return 0;
 593
 594 error:
 595         xvip_composite_v4l2_cleanup(xdev);
 596         return ret;
 597 }
 598
 599 static void xvip_composite_remove(struct platform_device *pdev)
 600 {
 601         struct xvip_composite_device *xdev = platform_get_drvdata(pdev);
 602
 603         xvip_graph_cleanup(xdev);
 604         xvip_composite_v4l2_cleanup(xdev);
 605 }
 606
 607 static const struct of_device_id xvip_composite_of_id_table[] = {
 608         { .compatible = "xlnx,video" },
 609         { }
 610 };
 611 MODULE_DEVICE_TABLE(of, xvip_composite_of_id_table);
 612
 613 static struct platform_driver xvip_composite_driver = {
 614         .driver = {
 615                 .name = "xilinx-video",
 616                 .of_match_table = xvip_composite_of_id_table,
 617         },
 618         .probe = xvip_composite_probe,
 619         .remove_new = xvip_composite_remove,
 620 };
 621
 622 module_platform_driver(xvip_composite_driver);
 623
 624 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
 625 MODULE_DESCRIPTION("Xilinx Video IP Composite Driver");
 626 MODULE_LICENSE("GPL v2");