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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Xilinx Video DMA
   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/dma/xilinx_dma.h>
  13 #include <linux/lcm.h>
  14 #include <linux/list.h>
  15 #include <linux/module.h>
  16 #include <linux/of.h>
  17 #include <linux/slab.h>
  18
  19 #include <media/v4l2-dev.h>
  20 #include <media/v4l2-fh.h>
  21 #include <media/v4l2-ioctl.h>
  22 #include <media/videobuf2-v4l2.h>
  23 #include <media/videobuf2-dma-contig.h>
  24
  25 #include "xilinx-dma.h"
  26 #include "xilinx-vip.h"
  27 #include "xilinx-vipp.h"
  28
  29 #define XVIP_DMA_DEF_FORMAT             V4L2_PIX_FMT_YUYV
  30 #define XVIP_DMA_DEF_WIDTH              1920
  31 #define XVIP_DMA_DEF_HEIGHT             1080
  32
  33 /* Minimum and maximum widths are expressed in bytes */
  34 #define XVIP_DMA_MIN_WIDTH              1U
  35 #define XVIP_DMA_MAX_WIDTH              65535U
  36 #define XVIP_DMA_MIN_HEIGHT             1U
  37 #define XVIP_DMA_MAX_HEIGHT             8191U
  38
  39 /* -----------------------------------------------------------------------------
  40  * Helper functions
  41  */
  42
  43 static struct v4l2_subdev *
  44 xvip_dma_remote_subdev(struct media_pad *local, u32 *pad)
  45 {
  46         struct media_pad *remote;
  47
  48         remote = media_entity_remote_pad(local);
  49         if (!remote || !is_media_entity_v4l2_subdev(remote->entity))
  50                 return NULL;
  51
  52         if (pad)
  53                 *pad = remote->index;
  54
  55         return media_entity_to_v4l2_subdev(remote->entity);
  56 }
  57
  58 static int xvip_dma_verify_format(struct xvip_dma *dma)
  59 {
  60         struct v4l2_subdev_format fmt;
  61         struct v4l2_subdev *subdev;
  62         int ret;
  63
  64         subdev = xvip_dma_remote_subdev(&dma->pad, &fmt.pad);
  65         if (subdev == NULL)
  66                 return -EPIPE;
  67
  68         fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
  69         ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
  70         if (ret < 0)
  71                 return ret == -ENOIOCTLCMD ? -EINVAL : ret;
  72
  73         if (dma->fmtinfo->code != fmt.format.code ||
  74             dma->format.height != fmt.format.height ||
  75             dma->format.width != fmt.format.width ||
  76             dma->format.colorspace != fmt.format.colorspace)
  77                 return -EINVAL;
  78
  79         return 0;
  80 }
  81
  82 /* -----------------------------------------------------------------------------
  83  * Pipeline Stream Management
  84  */
  85
  86 /**
  87  * xvip_pipeline_start_stop - Start ot stop streaming on a pipeline
  88  * @pipe: The pipeline
  89  * @start: Start (when true) or stop (when false) the pipeline
  90  *
  91  * Walk the entities chain starting at the pipeline output video node and start
  92  * or stop all of them.
  93  *
  94  * Return: 0 if successful, or the return value of the failed video::s_stream
  95  * operation otherwise.
  96  */
  97 static int xvip_pipeline_start_stop(struct xvip_pipeline *pipe, bool start)
  98 {
  99         struct xvip_dma *dma = pipe->output;
 100         struct media_entity *entity;
 101         struct media_pad *pad;
 102         struct v4l2_subdev *subdev;
 103         int ret;
 104
 105         entity = &dma->video.entity;
 106         while (1) {
 107                 pad = &entity->pads[0];
 108                 if (!(pad->flags & MEDIA_PAD_FL_SINK))
 109                         break;
 110
 111                 pad = media_entity_remote_pad(pad);
 112                 if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
 113                         break;
 114
 115                 entity = pad->entity;
 116                 subdev = media_entity_to_v4l2_subdev(entity);
 117
 118                 ret = v4l2_subdev_call(subdev, video, s_stream, start);
 119                 if (start && ret < 0 && ret != -ENOIOCTLCMD)
 120                         return ret;
 121         }
 122
 123         return 0;
 124 }
 125
 126 /**
 127  * xvip_pipeline_set_stream - Enable/disable streaming on a pipeline
 128  * @pipe: The pipeline
 129  * @on: Turn the stream on when true or off when false
 130  *
 131  * The pipeline is shared between all DMA engines connect at its input and
 132  * output. While the stream state of DMA engines can be controlled
 133  * independently, pipelines have a shared stream state that enable or disable
 134  * all entities in the pipeline. For this reason the pipeline uses a streaming
 135  * counter that tracks the number of DMA engines that have requested the stream
 136  * to be enabled.
 137  *
 138  * When called with the @on argument set to true, this function will increment
 139  * the pipeline streaming count. If the streaming count reaches the number of
 140  * DMA engines in the pipeline it will enable all entities that belong to the
 141  * pipeline.
 142  *
 143  * Similarly, when called with the @on argument set to false, this function will
 144  * decrement the pipeline streaming count and disable all entities in the
 145  * pipeline when the streaming count reaches zero.
 146  *
 147  * Return: 0 if successful, or the return value of the failed video::s_stream
 148  * operation otherwise. Stopping the pipeline never fails. The pipeline state is
 149  * not updated when the operation fails.
 150  */
 151 static int xvip_pipeline_set_stream(struct xvip_pipeline *pipe, bool on)
 152 {
 153         int ret = 0;
 154
 155         mutex_lock(&pipe->lock);
 156
 157         if (on) {
 158                 if (pipe->stream_count == pipe->num_dmas - 1) {
 159                         ret = xvip_pipeline_start_stop(pipe, true);
 160                         if (ret < 0)
 161                                 goto done;
 162                 }
 163                 pipe->stream_count++;
 164         } else {
 165                 if (--pipe->stream_count == 0)
 166                         xvip_pipeline_start_stop(pipe, false);
 167         }
 168
 169 done:
 170         mutex_unlock(&pipe->lock);
 171         return ret;
 172 }
 173
 174 static int xvip_pipeline_validate(struct xvip_pipeline *pipe,
 175                                   struct xvip_dma *start)
 176 {
 177         struct media_graph graph;
 178         struct media_entity *entity = &start->video.entity;
 179         struct media_device *mdev = entity->graph_obj.mdev;
 180         unsigned int num_inputs = 0;
 181         unsigned int num_outputs = 0;
 182         int ret;
 183
 184         mutex_lock(&mdev->graph_mutex);
 185
 186         /* Walk the graph to locate the video nodes. */
 187         ret = media_graph_walk_init(&graph, mdev);
 188         if (ret) {
 189                 mutex_unlock(&mdev->graph_mutex);
 190                 return ret;
 191         }
 192
 193         media_graph_walk_start(&graph, entity);
 194
 195         while ((entity = media_graph_walk_next(&graph))) {
 196                 struct xvip_dma *dma;
 197
 198                 if (entity->function != MEDIA_ENT_F_IO_V4L)
 199                         continue;
 200
 201                 dma = to_xvip_dma(media_entity_to_video_device(entity));
 202
 203                 if (dma->pad.flags & MEDIA_PAD_FL_SINK) {
 204                         pipe->output = dma;
 205                         num_outputs++;
 206                 } else {
 207                         num_inputs++;
 208                 }
 209         }
 210
 211         mutex_unlock(&mdev->graph_mutex);
 212
 213         media_graph_walk_cleanup(&graph);
 214
 215         /* We need exactly one output and zero or one input. */
 216         if (num_outputs != 1 || num_inputs > 1)
 217                 return -EPIPE;
 218
 219         pipe->num_dmas = num_inputs + num_outputs;
 220
 221         return 0;
 222 }
 223
 224 static void __xvip_pipeline_cleanup(struct xvip_pipeline *pipe)
 225 {
 226         pipe->num_dmas = 0;
 227         pipe->output = NULL;
 228 }
 229
 230 /**
 231  * xvip_pipeline_cleanup - Cleanup the pipeline after streaming
 232  * @pipe: the pipeline
 233  *
 234  * Decrease the pipeline use count and clean it up if we were the last user.
 235  */
 236 static void xvip_pipeline_cleanup(struct xvip_pipeline *pipe)
 237 {
 238         mutex_lock(&pipe->lock);
 239
 240         /* If we're the last user clean up the pipeline. */
 241         if (--pipe->use_count == 0)
 242                 __xvip_pipeline_cleanup(pipe);
 243
 244         mutex_unlock(&pipe->lock);
 245 }
 246
 247 /**
 248  * xvip_pipeline_prepare - Prepare the pipeline for streaming
 249  * @pipe: the pipeline
 250  * @dma: DMA engine at one end of the pipeline
 251  *
 252  * Validate the pipeline if no user exists yet, otherwise just increase the use
 253  * count.
 254  *
 255  * Return: 0 if successful or -EPIPE if the pipeline is not valid.
 256  */
 257 static int xvip_pipeline_prepare(struct xvip_pipeline *pipe,
 258                                  struct xvip_dma *dma)
 259 {
 260         int ret;
 261
 262         mutex_lock(&pipe->lock);
 263
 264         /* If we're the first user validate and initialize the pipeline. */
 265         if (pipe->use_count == 0) {
 266                 ret = xvip_pipeline_validate(pipe, dma);
 267                 if (ret < 0) {
 268                         __xvip_pipeline_cleanup(pipe);
 269                         goto done;
 270                 }
 271         }
 272
 273         pipe->use_count++;
 274         ret = 0;
 275
 276 done:
 277         mutex_unlock(&pipe->lock);
 278         return ret;
 279 }
 280
 281 /* -----------------------------------------------------------------------------
 282  * videobuf2 queue operations
 283  */
 284
 285 /**
 286  * struct xvip_dma_buffer - Video DMA buffer
 287  * @buf: vb2 buffer base object
 288  * @queue: buffer list entry in the DMA engine queued buffers list
 289  * @dma: DMA channel that uses the buffer
 290  */
 291 struct xvip_dma_buffer {
 292         struct vb2_v4l2_buffer buf;
 293         struct list_head queue;
 294         struct xvip_dma *dma;
 295 };
 296
 297 #define to_xvip_dma_buffer(vb)  container_of(vb, struct xvip_dma_buffer, buf)
 298
 299 static void xvip_dma_complete(void *param)
 300 {
 301         struct xvip_dma_buffer *buf = param;
 302         struct xvip_dma *dma = buf->dma;
 303
 304         spin_lock(&dma->queued_lock);
 305         list_del(&buf->queue);
 306         spin_unlock(&dma->queued_lock);
 307
 308         buf->buf.field = V4L2_FIELD_NONE;
 309         buf->buf.sequence = dma->sequence++;
 310         buf->buf.vb2_buf.timestamp = ktime_get_ns();
 311         vb2_set_plane_payload(&buf->buf.vb2_buf, 0, dma->format.sizeimage);
 312         vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_DONE);
 313 }
 314
 315 static int
 316 xvip_dma_queue_setup(struct vb2_queue *vq,
 317                      unsigned int *nbuffers, unsigned int *nplanes,
 318                      unsigned int sizes[], struct device *alloc_devs[])
 319 {
 320         struct xvip_dma *dma = vb2_get_drv_priv(vq);
 321
 322         /* Make sure the image size is large enough. */
 323         if (*nplanes)
 324                 return sizes[0] < dma->format.sizeimage ? -EINVAL : 0;
 325
 326         *nplanes = 1;
 327         sizes[0] = dma->format.sizeimage;
 328
 329         return 0;
 330 }
 331
 332 static int xvip_dma_buffer_prepare(struct vb2_buffer *vb)
 333 {
 334         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 335         struct xvip_dma *dma = vb2_get_drv_priv(vb->vb2_queue);
 336         struct xvip_dma_buffer *buf = to_xvip_dma_buffer(vbuf);
 337
 338         buf->dma = dma;
 339
 340         return 0;
 341 }
 342
 343 static void xvip_dma_buffer_queue(struct vb2_buffer *vb)
 344 {
 345         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 346         struct xvip_dma *dma = vb2_get_drv_priv(vb->vb2_queue);
 347         struct xvip_dma_buffer *buf = to_xvip_dma_buffer(vbuf);
 348         struct dma_async_tx_descriptor *desc;
 349         dma_addr_t addr = vb2_dma_contig_plane_dma_addr(vb, 0);
 350         u32 flags;
 351
 352         if (dma->queue.type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 353                 flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
 354                 dma->xt.dir = DMA_DEV_TO_MEM;
 355                 dma->xt.src_sgl = false;
 356                 dma->xt.dst_sgl = true;
 357                 dma->xt.dst_start = addr;
 358         } else {
 359                 flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
 360                 dma->xt.dir = DMA_MEM_TO_DEV;
 361                 dma->xt.src_sgl = true;
 362                 dma->xt.dst_sgl = false;
 363                 dma->xt.src_start = addr;
 364         }
 365
 366         dma->xt.frame_size = 1;
 367         dma->sgl[0].size = dma->format.width * dma->fmtinfo->bpp;
 368         dma->sgl[0].icg = dma->format.bytesperline - dma->sgl[0].size;
 369         dma->xt.numf = dma->format.height;
 370
 371         desc = dmaengine_prep_interleaved_dma(dma->dma, &dma->xt, flags);
 372         if (!desc) {
 373                 dev_err(dma->xdev->dev, "Failed to prepare DMA transfer\n");
 374                 vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_ERROR);
 375                 return;
 376         }
 377         desc->callback = xvip_dma_complete;
 378         desc->callback_param = buf;
 379
 380         spin_lock_irq(&dma->queued_lock);
 381         list_add_tail(&buf->queue, &dma->queued_bufs);
 382         spin_unlock_irq(&dma->queued_lock);
 383
 384         dmaengine_submit(desc);
 385
 386         if (vb2_is_streaming(&dma->queue))
 387                 dma_async_issue_pending(dma->dma);
 388 }
 389
 390 static int xvip_dma_start_streaming(struct vb2_queue *vq, unsigned int count)
 391 {
 392         struct xvip_dma *dma = vb2_get_drv_priv(vq);
 393         struct xvip_dma_buffer *buf, *nbuf;
 394         struct xvip_pipeline *pipe;
 395         int ret;
 396
 397         dma->sequence = 0;
 398
 399         /*
 400          * Start streaming on the pipeline. No link touching an entity in the
 401          * pipeline can be activated or deactivated once streaming is started.
 402          *
 403          * Use the pipeline object embedded in the first DMA object that starts
 404          * streaming.
 405          */
 406         pipe = dma->video.entity.pipe
 407              ? to_xvip_pipeline(&dma->video.entity) : &dma->pipe;
 408
 409         ret = media_pipeline_start(&dma->video.entity, &pipe->pipe);
 410         if (ret < 0)
 411                 goto error;
 412
 413         /* Verify that the configured format matches the output of the
 414          * connected subdev.
 415          */
 416         ret = xvip_dma_verify_format(dma);
 417         if (ret < 0)
 418                 goto error_stop;
 419
 420         ret = xvip_pipeline_prepare(pipe, dma);
 421         if (ret < 0)
 422                 goto error_stop;
 423
 424         /* Start the DMA engine. This must be done before starting the blocks
 425          * in the pipeline to avoid DMA synchronization issues.
 426          */
 427         dma_async_issue_pending(dma->dma);
 428
 429         /* Start the pipeline. */
 430         xvip_pipeline_set_stream(pipe, true);
 431
 432         return 0;
 433
 434 error_stop:
 435         media_pipeline_stop(&dma->video.entity);
 436
 437 error:
 438         /* Give back all queued buffers to videobuf2. */
 439         spin_lock_irq(&dma->queued_lock);
 440         list_for_each_entry_safe(buf, nbuf, &dma->queued_bufs, queue) {
 441                 vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_QUEUED);
 442                 list_del(&buf->queue);
 443         }
 444         spin_unlock_irq(&dma->queued_lock);
 445
 446         return ret;
 447 }
 448
 449 static void xvip_dma_stop_streaming(struct vb2_queue *vq)
 450 {
 451         struct xvip_dma *dma = vb2_get_drv_priv(vq);
 452         struct xvip_pipeline *pipe = to_xvip_pipeline(&dma->video.entity);
 453         struct xvip_dma_buffer *buf, *nbuf;
 454
 455         /* Stop the pipeline. */
 456         xvip_pipeline_set_stream(pipe, false);
 457
 458         /* Stop and reset the DMA engine. */
 459         dmaengine_terminate_all(dma->dma);
 460
 461         /* Cleanup the pipeline and mark it as being stopped. */
 462         xvip_pipeline_cleanup(pipe);
 463         media_pipeline_stop(&dma->video.entity);
 464
 465         /* Give back all queued buffers to videobuf2. */
 466         spin_lock_irq(&dma->queued_lock);
 467         list_for_each_entry_safe(buf, nbuf, &dma->queued_bufs, queue) {
 468                 vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_ERROR);
 469                 list_del(&buf->queue);
 470         }
 471         spin_unlock_irq(&dma->queued_lock);
 472 }
 473
 474 static const struct vb2_ops xvip_dma_queue_qops = {
 475         .queue_setup = xvip_dma_queue_setup,
 476         .buf_prepare = xvip_dma_buffer_prepare,
 477         .buf_queue = xvip_dma_buffer_queue,
 478         .wait_prepare = vb2_ops_wait_prepare,
 479         .wait_finish = vb2_ops_wait_finish,
 480         .start_streaming = xvip_dma_start_streaming,
 481         .stop_streaming = xvip_dma_stop_streaming,
 482 };
 483
 484 /* -----------------------------------------------------------------------------
 485  * V4L2 ioctls
 486  */
 487
 488 static int
 489 xvip_dma_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
 490 {
 491         struct v4l2_fh *vfh = file->private_data;
 492         struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
 493
 494         cap->capabilities = dma->xdev->v4l2_caps | V4L2_CAP_STREAMING |
 495                             V4L2_CAP_DEVICE_CAPS;
 496
 497         strscpy(cap->driver, "xilinx-vipp", sizeof(cap->driver));
 498         strscpy(cap->card, dma->video.name, sizeof(cap->card));
 499         snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%pOFn:%u",
 500                  dma->xdev->dev->of_node, dma->port);
 501
 502         return 0;
 503 }
 504
 505 /* FIXME: without this callback function, some applications are not configured
 506  * with correct formats, and it results in frames in wrong format. Whether this
 507  * callback needs to be required is not clearly defined, so it should be
 508  * clarified through the mailing list.
 509  */
 510 static int
 511 xvip_dma_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f)
 512 {
 513         struct v4l2_fh *vfh = file->private_data;
 514         struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
 515
 516         if (f->index > 0)
 517                 return -EINVAL;
 518
 519         f->pixelformat = dma->format.pixelformat;
 520
 521         return 0;
 522 }
 523
 524 static int
 525 xvip_dma_get_format(struct file *file, void *fh, struct v4l2_format *format)
 526 {
 527         struct v4l2_fh *vfh = file->private_data;
 528         struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
 529
 530         format->fmt.pix = dma->format;
 531
 532         return 0;
 533 }
 534
 535 static void
 536 __xvip_dma_try_format(struct xvip_dma *dma, struct v4l2_pix_format *pix,
 537                       const struct xvip_video_format **fmtinfo)
 538 {
 539         const struct xvip_video_format *info;
 540         unsigned int min_width;
 541         unsigned int max_width;
 542         unsigned int min_bpl;
 543         unsigned int max_bpl;
 544         unsigned int width;
 545         unsigned int align;
 546         unsigned int bpl;
 547
 548         /* Retrieve format information and select the default format if the
 549          * requested format isn't supported.
 550          */
 551         info = xvip_get_format_by_fourcc(pix->pixelformat);
 552         if (IS_ERR(info))
 553                 info = xvip_get_format_by_fourcc(XVIP_DMA_DEF_FORMAT);
 554
 555         pix->pixelformat = info->fourcc;
 556         pix->field = V4L2_FIELD_NONE;
 557
 558         /* The transfer alignment requirements are expressed in bytes. Compute
 559          * the minimum and maximum values, clamp the requested width and convert
 560          * it back to pixels.
 561          */
 562         align = lcm(dma->align, info->bpp);
 563         min_width = roundup(XVIP_DMA_MIN_WIDTH, align);
 564         max_width = rounddown(XVIP_DMA_MAX_WIDTH, align);
 565         width = rounddown(pix->width * info->bpp, align);
 566
 567         pix->width = clamp(width, min_width, max_width) / info->bpp;
 568         pix->height = clamp(pix->height, XVIP_DMA_MIN_HEIGHT,
 569                             XVIP_DMA_MAX_HEIGHT);
 570
 571         /* Clamp the requested bytes per line value. If the maximum bytes per
 572          * line value is zero, the module doesn't support user configurable line
 573          * sizes. Override the requested value with the minimum in that case.
 574          */
 575         min_bpl = pix->width * info->bpp;
 576         max_bpl = rounddown(XVIP_DMA_MAX_WIDTH, dma->align);
 577         bpl = rounddown(pix->bytesperline, dma->align);
 578
 579         pix->bytesperline = clamp(bpl, min_bpl, max_bpl);
 580         pix->sizeimage = pix->bytesperline * pix->height;
 581
 582         if (fmtinfo)
 583                 *fmtinfo = info;
 584 }
 585
 586 static int
 587 xvip_dma_try_format(struct file *file, void *fh, struct v4l2_format *format)
 588 {
 589         struct v4l2_fh *vfh = file->private_data;
 590         struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
 591
 592         __xvip_dma_try_format(dma, &format->fmt.pix, NULL);
 593         return 0;
 594 }
 595
 596 static int
 597 xvip_dma_set_format(struct file *file, void *fh, struct v4l2_format *format)
 598 {
 599         struct v4l2_fh *vfh = file->private_data;
 600         struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
 601         const struct xvip_video_format *info;
 602
 603         __xvip_dma_try_format(dma, &format->fmt.pix, &info);
 604
 605         if (vb2_is_busy(&dma->queue))
 606                 return -EBUSY;
 607
 608         dma->format = format->fmt.pix;
 609         dma->fmtinfo = info;
 610
 611         return 0;
 612 }
 613
 614 static const struct v4l2_ioctl_ops xvip_dma_ioctl_ops = {
 615         .vidioc_querycap                = xvip_dma_querycap,
 616         .vidioc_enum_fmt_vid_cap        = xvip_dma_enum_format,
 617         .vidioc_g_fmt_vid_cap           = xvip_dma_get_format,
 618         .vidioc_g_fmt_vid_out           = xvip_dma_get_format,
 619         .vidioc_s_fmt_vid_cap           = xvip_dma_set_format,
 620         .vidioc_s_fmt_vid_out           = xvip_dma_set_format,
 621         .vidioc_try_fmt_vid_cap         = xvip_dma_try_format,
 622         .vidioc_try_fmt_vid_out         = xvip_dma_try_format,
 623         .vidioc_reqbufs                 = vb2_ioctl_reqbufs,
 624         .vidioc_querybuf                = vb2_ioctl_querybuf,
 625         .vidioc_qbuf                    = vb2_ioctl_qbuf,
 626         .vidioc_dqbuf                   = vb2_ioctl_dqbuf,
 627         .vidioc_create_bufs             = vb2_ioctl_create_bufs,
 628         .vidioc_expbuf                  = vb2_ioctl_expbuf,
 629         .vidioc_streamon                = vb2_ioctl_streamon,
 630         .vidioc_streamoff               = vb2_ioctl_streamoff,
 631 };
 632
 633 /* -----------------------------------------------------------------------------
 634  * V4L2 file operations
 635  */
 636
 637 static const struct v4l2_file_operations xvip_dma_fops = {
 638         .owner          = THIS_MODULE,
 639         .unlocked_ioctl = video_ioctl2,
 640         .open           = v4l2_fh_open,
 641         .release        = vb2_fop_release,
 642         .poll           = vb2_fop_poll,
 643         .mmap           = vb2_fop_mmap,
 644 };
 645
 646 /* -----------------------------------------------------------------------------
 647  * Xilinx Video DMA Core
 648  */
 649
 650 int xvip_dma_init(struct xvip_composite_device *xdev, struct xvip_dma *dma,
 651                   enum v4l2_buf_type type, unsigned int port)
 652 {
 653         char name[16];
 654         int ret;
 655
 656         dma->xdev = xdev;
 657         dma->port = port;
 658         mutex_init(&dma->lock);
 659         mutex_init(&dma->pipe.lock);
 660         INIT_LIST_HEAD(&dma->queued_bufs);
 661         spin_lock_init(&dma->queued_lock);
 662
 663         dma->fmtinfo = xvip_get_format_by_fourcc(XVIP_DMA_DEF_FORMAT);
 664         dma->format.pixelformat = dma->fmtinfo->fourcc;
 665         dma->format.colorspace = V4L2_COLORSPACE_SRGB;
 666         dma->format.field = V4L2_FIELD_NONE;
 667         dma->format.width = XVIP_DMA_DEF_WIDTH;
 668         dma->format.height = XVIP_DMA_DEF_HEIGHT;
 669         dma->format.bytesperline = dma->format.width * dma->fmtinfo->bpp;
 670         dma->format.sizeimage = dma->format.bytesperline * dma->format.height;
 671
 672         /* Initialize the media entity... */
 673         dma->pad.flags = type == V4L2_BUF_TYPE_VIDEO_CAPTURE
 674                        ? MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
 675
 676         ret = media_entity_pads_init(&dma->video.entity, 1, &dma->pad);
 677         if (ret < 0)
 678                 goto error;
 679
 680         /* ... and the video node... */
 681         dma->video.fops = &xvip_dma_fops;
 682         dma->video.v4l2_dev = &xdev->v4l2_dev;
 683         dma->video.queue = &dma->queue;
 684         snprintf(dma->video.name, sizeof(dma->video.name), "%pOFn %s %u",
 685                  xdev->dev->of_node,
 686                  type == V4L2_BUF_TYPE_VIDEO_CAPTURE ? "output" : "input",
 687                  port);
 688         dma->video.vfl_type = VFL_TYPE_VIDEO;
 689         dma->video.vfl_dir = type == V4L2_BUF_TYPE_VIDEO_CAPTURE
 690                            ? VFL_DIR_RX : VFL_DIR_TX;
 691         dma->video.release = video_device_release_empty;
 692         dma->video.ioctl_ops = &xvip_dma_ioctl_ops;
 693         dma->video.lock = &dma->lock;
 694         dma->video.device_caps = V4L2_CAP_STREAMING;
 695         if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 696                 dma->video.device_caps |= V4L2_CAP_VIDEO_CAPTURE;
 697         else
 698                 dma->video.device_caps |= V4L2_CAP_VIDEO_OUTPUT;
 699
 700         video_set_drvdata(&dma->video, dma);
 701
 702         /* ... and the buffers queue... */
 703         /* Don't enable VB2_READ and VB2_WRITE, as using the read() and write()
 704          * V4L2 APIs would be inefficient. Testing on the command line with a
 705          * 'cat /dev/video?' thus won't be possible, but given that the driver
 706          * anyway requires a test tool to setup the pipeline before any video
 707          * stream can be started, requiring a specific V4L2 test tool as well
 708          * instead of 'cat' isn't really a drawback.
 709          */
 710         dma->queue.type = type;
 711         dma->queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
 712         dma->queue.lock = &dma->lock;
 713         dma->queue.drv_priv = dma;
 714         dma->queue.buf_struct_size = sizeof(struct xvip_dma_buffer);
 715         dma->queue.ops = &xvip_dma_queue_qops;
 716         dma->queue.mem_ops = &vb2_dma_contig_memops;
 717         dma->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC
 718                                    | V4L2_BUF_FLAG_TSTAMP_SRC_EOF;
 719         dma->queue.dev = dma->xdev->dev;
 720         ret = vb2_queue_init(&dma->queue);
 721         if (ret < 0) {
 722                 dev_err(dma->xdev->dev, "failed to initialize VB2 queue\n");
 723                 goto error;
 724         }
 725
 726         /* ... and the DMA channel. */
 727         snprintf(name, sizeof(name), "port%u", port);
 728         dma->dma = dma_request_chan(dma->xdev->dev, name);
 729         if (IS_ERR(dma->dma)) {
 730                 ret = PTR_ERR(dma->dma);
 731                 if (ret != -EPROBE_DEFER)
 732                         dev_err(dma->xdev->dev, "no VDMA channel found\n");
 733                 goto error;
 734         }
 735
 736         dma->align = 1 << dma->dma->device->copy_align;
 737
 738         ret = video_register_device(&dma->video, VFL_TYPE_VIDEO, -1);
 739         if (ret < 0) {
 740                 dev_err(dma->xdev->dev, "failed to register video device\n");
 741                 goto error;
 742         }
 743
 744         return 0;
 745
 746 error:
 747         xvip_dma_cleanup(dma);
 748         return ret;
 749 }
 750
 751 void xvip_dma_cleanup(struct xvip_dma *dma)
 752 {
 753         if (video_is_registered(&dma->video))
 754                 video_unregister_device(&dma->video);
 755
 756         if (!IS_ERR_OR_NULL(dma->dma))
 757                 dma_release_channel(dma->dma);
 758
 759         media_entity_cleanup(&dma->video.entity);
 760
 761         mutex_destroy(&dma->lock);
 762         mutex_destroy(&dma->pipe.lock);
 763 }