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

   1 /*
   2  * Xilinx Video DMA
   3  *
   4  * Copyright (C) 2013-2015 Ideas on Board
   5  * Copyright (C) 2013-2015 Xilinx, Inc.
   6  *
   7  * Contacts: Hyun Kwon <hyun.kwon@xilinx.com>
   8  *           Laurent Pinchart <laurent.pinchart@ideasonboard.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/dma/xilinx_dma.h>
  16 #include <linux/lcm.h>
  17 #include <linux/list.h>
  18 #include <linux/module.h>
  19 #include <linux/of.h>
  20 #include <linux/slab.h>
  21
  22 #include <media/v4l2-dev.h>
  23 #include <media/v4l2-fh.h>
  24 #include <media/v4l2-ioctl.h>
  25 #include <media/videobuf2-v4l2.h>
  26 #include <media/videobuf2-dma-contig.h>
  27
  28 #include "xilinx-dma.h"
  29 #include "xilinx-vip.h"
  30 #include "xilinx-vipp.h"
  31
  32 #define XVIP_DMA_DEF_FORMAT             V4L2_PIX_FMT_YUYV
  33 #define XVIP_DMA_DEF_WIDTH              1920
  34 #define XVIP_DMA_DEF_HEIGHT             1080
  35
  36 /* Minimum and maximum widths are expressed in bytes */
  37 #define XVIP_DMA_MIN_WIDTH              1U
  38 #define XVIP_DMA_MAX_WIDTH              65535U
  39 #define XVIP_DMA_MIN_HEIGHT             1U
  40 #define XVIP_DMA_MAX_HEIGHT             8191U
  41
  42 /* -----------------------------------------------------------------------------
  43  * Helper functions
  44  */
  45
  46 static struct v4l2_subdev *
  47 xvip_dma_remote_subdev(struct media_pad *local, u32 *pad)
  48 {
  49         struct media_pad *remote;
  50
  51         remote = media_entity_remote_pad(local);
  52         if (remote == NULL ||
  53             media_entity_type(remote->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
  54                 return NULL;
  55
  56         if (pad)
  57                 *pad = remote->index;
  58
  59         return media_entity_to_v4l2_subdev(remote->entity);
  60 }
  61
  62 static int xvip_dma_verify_format(struct xvip_dma *dma)
  63 {
  64         struct v4l2_subdev_format fmt;
  65         struct v4l2_subdev *subdev;
  66         int ret;
  67
  68         subdev = xvip_dma_remote_subdev(&dma->pad, &fmt.pad);
  69         if (subdev == NULL)
  70                 return -EPIPE;
  71
  72         fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
  73         ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
  74         if (ret < 0)
  75                 return ret == -ENOIOCTLCMD ? -EINVAL : ret;
  76
  77         if (dma->fmtinfo->code != fmt.format.code ||
  78             dma->format.height != fmt.format.height ||
  79             dma->format.width != fmt.format.width ||
  80             dma->format.colorspace != fmt.format.colorspace)
  81                 return -EINVAL;
  82
  83         return 0;
  84 }
  85
  86 /* -----------------------------------------------------------------------------
  87  * Pipeline Stream Management
  88  */
  89
  90 /**
  91  * xvip_pipeline_start_stop - Start ot stop streaming on a pipeline
  92  * @pipe: The pipeline
  93  * @start: Start (when true) or stop (when false) the pipeline
  94  *
  95  * Walk the entities chain starting at the pipeline output video node and start
  96  * or stop all of them.
  97  *
  98  * Return: 0 if successful, or the return value of the failed video::s_stream
  99  * operation otherwise.
 100  */
 101 static int xvip_pipeline_start_stop(struct xvip_pipeline *pipe, bool start)
 102 {
 103         struct xvip_dma *dma = pipe->output;
 104         struct media_entity *entity;
 105         struct media_pad *pad;
 106         struct v4l2_subdev *subdev;
 107         int ret;
 108
 109         entity = &dma->video.entity;
 110         while (1) {
 111                 pad = &entity->pads[0];
 112                 if (!(pad->flags & MEDIA_PAD_FL_SINK))
 113                         break;
 114
 115                 pad = media_entity_remote_pad(pad);
 116                 if (pad == NULL ||
 117                     media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
 118                         break;
 119
 120                 entity = pad->entity;
 121                 subdev = media_entity_to_v4l2_subdev(entity);
 122
 123                 ret = v4l2_subdev_call(subdev, video, s_stream, start);
 124                 if (start && ret < 0 && ret != -ENOIOCTLCMD)
 125                         return ret;
 126         }
 127
 128         return 0;
 129 }
 130
 131 /**
 132  * xvip_pipeline_set_stream - Enable/disable streaming on a pipeline
 133  * @pipe: The pipeline
 134  * @on: Turn the stream on when true or off when false
 135  *
 136  * The pipeline is shared between all DMA engines connect at its input and
 137  * output. While the stream state of DMA engines can be controlled
 138  * independently, pipelines have a shared stream state that enable or disable
 139  * all entities in the pipeline. For this reason the pipeline uses a streaming
 140  * counter that tracks the number of DMA engines that have requested the stream
 141  * to be enabled.
 142  *
 143  * When called with the @on argument set to true, this function will increment
 144  * the pipeline streaming count. If the streaming count reaches the number of
 145  * DMA engines in the pipeline it will enable all entities that belong to the
 146  * pipeline.
 147  *
 148  * Similarly, when called with the @on argument set to false, this function will
 149  * decrement the pipeline streaming count and disable all entities in the
 150  * pipeline when the streaming count reaches zero.
 151  *
 152  * Return: 0 if successful, or the return value of the failed video::s_stream
 153  * operation otherwise. Stopping the pipeline never fails. The pipeline state is
 154  * not updated when the operation fails.
 155  */
 156 static int xvip_pipeline_set_stream(struct xvip_pipeline *pipe, bool on)
 157 {
 158         int ret = 0;
 159
 160         mutex_lock(&pipe->lock);
 161
 162         if (on) {
 163                 if (pipe->stream_count == pipe->num_dmas - 1) {
 164                         ret = xvip_pipeline_start_stop(pipe, true);
 165                         if (ret < 0)
 166                                 goto done;
 167                 }
 168                 pipe->stream_count++;
 169         } else {
 170                 if (--pipe->stream_count == 0)
 171                         xvip_pipeline_start_stop(pipe, false);
 172         }
 173
 174 done:
 175         mutex_unlock(&pipe->lock);
 176         return ret;
 177 }
 178
 179 static int xvip_pipeline_validate(struct xvip_pipeline *pipe,
 180                                   struct xvip_dma *start)
 181 {
 182         struct media_entity_graph graph;
 183         struct media_entity *entity = &start->video.entity;
 184         struct media_device *mdev = entity->parent;
 185         unsigned int num_inputs = 0;
 186         unsigned int num_outputs = 0;
 187
 188         mutex_lock(&mdev->graph_mutex);
 189
 190         /* Walk the graph to locate the video nodes. */
 191         media_entity_graph_walk_start(&graph, entity);
 192
 193         while ((entity = media_entity_graph_walk_next(&graph))) {
 194                 struct xvip_dma *dma;
 195
 196                 if (entity->type != MEDIA_ENT_T_DEVNODE_V4L)
 197                         continue;
 198
 199                 dma = to_xvip_dma(media_entity_to_video_device(entity));
 200
 201                 if (dma->pad.flags & MEDIA_PAD_FL_SINK) {
 202                         pipe->output = dma;
 203                         num_outputs++;
 204                 } else {
 205                         num_inputs++;
 206                 }
 207         }
 208
 209         mutex_unlock(&mdev->graph_mutex);
 210
 211         /* We need exactly one output and zero or one input. */
 212         if (num_outputs != 1 || num_inputs > 1)
 213                 return -EPIPE;
 214
 215         pipe->num_dmas = num_inputs + num_outputs;
 216
 217         return 0;
 218 }
 219
 220 static void __xvip_pipeline_cleanup(struct xvip_pipeline *pipe)
 221 {
 222         pipe->num_dmas = 0;
 223         pipe->output = NULL;
 224 }
 225
 226 /**
 227  * xvip_pipeline_cleanup - Cleanup the pipeline after streaming
 228  * @pipe: the pipeline
 229  *
 230  * Decrease the pipeline use count and clean it up if we were the last user.
 231  */
 232 static void xvip_pipeline_cleanup(struct xvip_pipeline *pipe)
 233 {
 234         mutex_lock(&pipe->lock);
 235
 236         /* If we're the last user clean up the pipeline. */
 237         if (--pipe->use_count == 0)
 238                 __xvip_pipeline_cleanup(pipe);
 239
 240         mutex_unlock(&pipe->lock);
 241 }
 242
 243 /**
 244  * xvip_pipeline_prepare - Prepare the pipeline for streaming
 245  * @pipe: the pipeline
 246  * @dma: DMA engine at one end of the pipeline
 247  *
 248  * Validate the pipeline if no user exists yet, otherwise just increase the use
 249  * count.
 250  *
 251  * Return: 0 if successful or -EPIPE if the pipeline is not valid.
 252  */
 253 static int xvip_pipeline_prepare(struct xvip_pipeline *pipe,
 254                                  struct xvip_dma *dma)
 255 {
 256         int ret;
 257
 258         mutex_lock(&pipe->lock);
 259
 260         /* If we're the first user validate and initialize the pipeline. */
 261         if (pipe->use_count == 0) {
 262                 ret = xvip_pipeline_validate(pipe, dma);
 263                 if (ret < 0) {
 264                         __xvip_pipeline_cleanup(pipe);
 265                         goto done;
 266                 }
 267         }
 268
 269         pipe->use_count++;
 270         ret = 0;
 271
 272 done:
 273         mutex_unlock(&pipe->lock);
 274         return ret;
 275 }
 276
 277 /* -----------------------------------------------------------------------------
 278  * videobuf2 queue operations
 279  */
 280
 281 /**
 282  * struct xvip_dma_buffer - Video DMA buffer
 283  * @buf: vb2 buffer base object
 284  * @queue: buffer list entry in the DMA engine queued buffers list
 285  * @dma: DMA channel that uses the buffer
 286  */
 287 struct xvip_dma_buffer {
 288         struct vb2_v4l2_buffer buf;
 289         struct list_head queue;
 290         struct xvip_dma *dma;
 291 };
 292
 293 #define to_xvip_dma_buffer(vb)  container_of(vb, struct xvip_dma_buffer, buf)
 294
 295 static void xvip_dma_complete(void *param)
 296 {
 297         struct xvip_dma_buffer *buf = param;
 298         struct xvip_dma *dma = buf->dma;
 299
 300         spin_lock(&dma->queued_lock);
 301         list_del(&buf->queue);
 302         spin_unlock(&dma->queued_lock);
 303
 304         buf->buf.field = V4L2_FIELD_NONE;
 305         buf->buf.sequence = dma->sequence++;
 306         v4l2_get_timestamp(&buf->buf.timestamp);
 307         vb2_set_plane_payload(&buf->buf.vb2_buf, 0, dma->format.sizeimage);
 308         vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_DONE);
 309 }
 310
 311 static int
 312 xvip_dma_queue_setup(struct vb2_queue *vq, const void *parg,
 313                      unsigned int *nbuffers, unsigned int *nplanes,
 314                      unsigned int sizes[], void *alloc_ctxs[])
 315 {
 316         const struct v4l2_format *fmt = parg;
 317         struct xvip_dma *dma = vb2_get_drv_priv(vq);
 318
 319         /* Make sure the image size is large enough. */
 320         if (fmt && fmt->fmt.pix.sizeimage < dma->format.sizeimage)
 321                 return -EINVAL;
 322
 323         *nplanes = 1;
 324
 325         sizes[0] = fmt ? fmt->fmt.pix.sizeimage : dma->format.sizeimage;
 326         alloc_ctxs[0] = dma->alloc_ctx;
 327
 328         return 0;
 329 }
 330
 331 static int xvip_dma_buffer_prepare(struct vb2_buffer *vb)
 332 {
 333         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 334         struct xvip_dma *dma = vb2_get_drv_priv(vb->vb2_queue);
 335         struct xvip_dma_buffer *buf = to_xvip_dma_buffer(vbuf);
 336
 337         buf->dma = dma;
 338
 339         return 0;
 340 }
 341
 342 static void xvip_dma_buffer_queue(struct vb2_buffer *vb)
 343 {
 344         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 345         struct xvip_dma *dma = vb2_get_drv_priv(vb->vb2_queue);
 346         struct xvip_dma_buffer *buf = to_xvip_dma_buffer(vbuf);
 347         struct dma_async_tx_descriptor *desc;
 348         dma_addr_t addr = vb2_dma_contig_plane_dma_addr(vb, 0);
 349         u32 flags;
 350
 351         if (dma->queue.type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 352                 flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
 353                 dma->xt.dir = DMA_DEV_TO_MEM;
 354                 dma->xt.src_sgl = false;
 355                 dma->xt.dst_sgl = true;
 356                 dma->xt.dst_start = addr;
 357         } else {
 358                 flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
 359                 dma->xt.dir = DMA_MEM_TO_DEV;
 360                 dma->xt.src_sgl = true;
 361                 dma->xt.dst_sgl = false;
 362                 dma->xt.src_start = addr;
 363         }
 364
 365         dma->xt.frame_size = 1;
 366         dma->sgl[0].size = dma->format.width * dma->fmtinfo->bpp;
 367         dma->sgl[0].icg = dma->format.bytesperline - dma->sgl[0].size;
 368         dma->xt.numf = dma->format.height;
 369
 370         desc = dmaengine_prep_interleaved_dma(dma->dma, &dma->xt, flags);
 371         if (!desc) {
 372                 dev_err(dma->xdev->dev, "Failed to prepare DMA transfer\n");
 373                 vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_ERROR);
 374                 return;
 375         }
 376         desc->callback = xvip_dma_complete;
 377         desc->callback_param = buf;
 378
 379         spin_lock_irq(&dma->queued_lock);
 380         list_add_tail(&buf->queue, &dma->queued_bufs);
 381         spin_unlock_irq(&dma->queued_lock);
 382
 383         dmaengine_submit(desc);
 384
 385         if (vb2_is_streaming(&dma->queue))
 386                 dma_async_issue_pending(dma->dma);
 387 }
 388
 389 static int xvip_dma_start_streaming(struct vb2_queue *vq, unsigned int count)
 390 {
 391         struct xvip_dma *dma = vb2_get_drv_priv(vq);
 392         struct xvip_dma_buffer *buf, *nbuf;
 393         struct xvip_pipeline *pipe;
 394         int ret;
 395
 396         dma->sequence = 0;
 397
 398         /*
 399          * Start streaming on the pipeline. No link touching an entity in the
 400          * pipeline can be activated or deactivated once streaming is started.
 401          *
 402          * Use the pipeline object embedded in the first DMA object that starts
 403          * streaming.
 404          */
 405         pipe = dma->video.entity.pipe
 406              ? to_xvip_pipeline(&dma->video.entity) : &dma->pipe;
 407
 408         ret = media_entity_pipeline_start(&dma->video.entity, &pipe->pipe);
 409         if (ret < 0)
 410                 goto error;
 411
 412         /* Verify that the configured format matches the output of the
 413          * connected subdev.
 414          */
 415         ret = xvip_dma_verify_format(dma);
 416         if (ret < 0)
 417                 goto error_stop;
 418
 419         ret = xvip_pipeline_prepare(pipe, dma);
 420         if (ret < 0)
 421                 goto error_stop;
 422
 423         /* Start the DMA engine. This must be done before starting the blocks
 424          * in the pipeline to avoid DMA synchronization issues.
 425          */
 426         dma_async_issue_pending(dma->dma);
 427
 428         /* Start the pipeline. */
 429         xvip_pipeline_set_stream(pipe, true);
 430
 431         return 0;
 432
 433 error_stop:
 434         media_entity_pipeline_stop(&dma->video.entity);
 435
 436 error:
 437         /* Give back all queued buffers to videobuf2. */
 438         spin_lock_irq(&dma->queued_lock);
 439         list_for_each_entry_safe(buf, nbuf, &dma->queued_bufs, queue) {
 440                 vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_QUEUED);
 441                 list_del(&buf->queue);
 442         }
 443         spin_unlock_irq(&dma->queued_lock);
 444
 445         return ret;
 446 }
 447
 448 static void xvip_dma_stop_streaming(struct vb2_queue *vq)
 449 {
 450         struct xvip_dma *dma = vb2_get_drv_priv(vq);
 451         struct xvip_pipeline *pipe = to_xvip_pipeline(&dma->video.entity);
 452         struct xvip_dma_buffer *buf, *nbuf;
 453
 454         /* Stop the pipeline. */
 455         xvip_pipeline_set_stream(pipe, false);
 456
 457         /* Stop and reset the DMA engine. */
 458         dmaengine_terminate_all(dma->dma);
 459
 460         /* Cleanup the pipeline and mark it as being stopped. */
 461         xvip_pipeline_cleanup(pipe);
 462         media_entity_pipeline_stop(&dma->video.entity);
 463
 464         /* Give back all queued buffers to videobuf2. */
 465         spin_lock_irq(&dma->queued_lock);
 466         list_for_each_entry_safe(buf, nbuf, &dma->queued_bufs, queue) {
 467                 vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_ERROR);
 468                 list_del(&buf->queue);
 469         }
 470         spin_unlock_irq(&dma->queued_lock);
 471 }
 472
 473 static struct vb2_ops xvip_dma_queue_qops = {
 474         .queue_setup = xvip_dma_queue_setup,
 475         .buf_prepare = xvip_dma_buffer_prepare,
 476         .buf_queue = xvip_dma_buffer_queue,
 477         .wait_prepare = vb2_ops_wait_prepare,
 478         .wait_finish = vb2_ops_wait_finish,
 479         .start_streaming = xvip_dma_start_streaming,
 480         .stop_streaming = xvip_dma_stop_streaming,
 481 };
 482
 483 /* -----------------------------------------------------------------------------
 484  * V4L2 ioctls
 485  */
 486
 487 static int
 488 xvip_dma_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
 489 {
 490         struct v4l2_fh *vfh = file->private_data;
 491         struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
 492
 493         cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
 494                           | dma->xdev->v4l2_caps;
 495
 496         if (dma->queue.type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 497                 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
 498         else
 499                 cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
 500
 501         strlcpy(cap->driver, "xilinx-vipp", sizeof(cap->driver));
 502         strlcpy(cap->card, dma->video.name, sizeof(cap->card));
 503         snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s:%u",
 504                  dma->xdev->dev->of_node->name, dma->port);
 505
 506         return 0;
 507 }
 508
 509 /* FIXME: without this callback function, some applications are not configured
 510  * with correct formats, and it results in frames in wrong format. Whether this
 511  * callback needs to be required is not clearly defined, so it should be
 512  * clarified through the mailing list.
 513  */
 514 static int
 515 xvip_dma_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f)
 516 {
 517         struct v4l2_fh *vfh = file->private_data;
 518         struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
 519
 520         if (f->index > 0)
 521                 return -EINVAL;
 522
 523         f->pixelformat = dma->format.pixelformat;
 524         strlcpy(f->description, dma->fmtinfo->description,
 525                 sizeof(f->description));
 526
 527         return 0;
 528 }
 529
 530 static int
 531 xvip_dma_get_format(struct file *file, void *fh, struct v4l2_format *format)
 532 {
 533         struct v4l2_fh *vfh = file->private_data;
 534         struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
 535
 536         format->fmt.pix = dma->format;
 537
 538         return 0;
 539 }
 540
 541 static void
 542 __xvip_dma_try_format(struct xvip_dma *dma, struct v4l2_pix_format *pix,
 543                       const struct xvip_video_format **fmtinfo)
 544 {
 545         const struct xvip_video_format *info;
 546         unsigned int min_width;
 547         unsigned int max_width;
 548         unsigned int min_bpl;
 549         unsigned int max_bpl;
 550         unsigned int width;
 551         unsigned int align;
 552         unsigned int bpl;
 553
 554         /* Retrieve format information and select the default format if the
 555          * requested format isn't supported.
 556          */
 557         info = xvip_get_format_by_fourcc(pix->pixelformat);
 558         if (IS_ERR(info))
 559                 info = xvip_get_format_by_fourcc(XVIP_DMA_DEF_FORMAT);
 560
 561         pix->pixelformat = info->fourcc;
 562         pix->field = V4L2_FIELD_NONE;
 563
 564         /* The transfer alignment requirements are expressed in bytes. Compute
 565          * the minimum and maximum values, clamp the requested width and convert
 566          * it back to pixels.
 567          */
 568         align = lcm(dma->align, info->bpp);
 569         min_width = roundup(XVIP_DMA_MIN_WIDTH, align);
 570         max_width = rounddown(XVIP_DMA_MAX_WIDTH, align);
 571         width = rounddown(pix->width * info->bpp, align);
 572
 573         pix->width = clamp(width, min_width, max_width) / info->bpp;
 574         pix->height = clamp(pix->height, XVIP_DMA_MIN_HEIGHT,
 575                             XVIP_DMA_MAX_HEIGHT);
 576
 577         /* Clamp the requested bytes per line value. If the maximum bytes per
 578          * line value is zero, the module doesn't support user configurable line
 579          * sizes. Override the requested value with the minimum in that case.
 580          */
 581         min_bpl = pix->width * info->bpp;
 582         max_bpl = rounddown(XVIP_DMA_MAX_WIDTH, dma->align);
 583         bpl = rounddown(pix->bytesperline, dma->align);
 584
 585         pix->bytesperline = clamp(bpl, min_bpl, max_bpl);
 586         pix->sizeimage = pix->bytesperline * pix->height;
 587
 588         if (fmtinfo)
 589                 *fmtinfo = info;
 590 }
 591
 592 static int
 593 xvip_dma_try_format(struct file *file, void *fh, struct v4l2_format *format)
 594 {
 595         struct v4l2_fh *vfh = file->private_data;
 596         struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
 597
 598         __xvip_dma_try_format(dma, &format->fmt.pix, NULL);
 599         return 0;
 600 }
 601
 602 static int
 603 xvip_dma_set_format(struct file *file, void *fh, struct v4l2_format *format)
 604 {
 605         struct v4l2_fh *vfh = file->private_data;
 606         struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
 607         const struct xvip_video_format *info;
 608
 609         __xvip_dma_try_format(dma, &format->fmt.pix, &info);
 610
 611         if (vb2_is_busy(&dma->queue))
 612                 return -EBUSY;
 613
 614         dma->format = format->fmt.pix;
 615         dma->fmtinfo = info;
 616
 617         return 0;
 618 }
 619
 620 static const struct v4l2_ioctl_ops xvip_dma_ioctl_ops = {
 621         .vidioc_querycap                = xvip_dma_querycap,
 622         .vidioc_enum_fmt_vid_cap        = xvip_dma_enum_format,
 623         .vidioc_g_fmt_vid_cap           = xvip_dma_get_format,
 624         .vidioc_g_fmt_vid_out           = xvip_dma_get_format,
 625         .vidioc_s_fmt_vid_cap           = xvip_dma_set_format,
 626         .vidioc_s_fmt_vid_out           = xvip_dma_set_format,
 627         .vidioc_try_fmt_vid_cap         = xvip_dma_try_format,
 628         .vidioc_try_fmt_vid_out         = xvip_dma_try_format,
 629         .vidioc_reqbufs                 = vb2_ioctl_reqbufs,
 630         .vidioc_querybuf                = vb2_ioctl_querybuf,
 631         .vidioc_qbuf                    = vb2_ioctl_qbuf,
 632         .vidioc_dqbuf                   = vb2_ioctl_dqbuf,
 633         .vidioc_create_bufs             = vb2_ioctl_create_bufs,
 634         .vidioc_expbuf                  = vb2_ioctl_expbuf,
 635         .vidioc_streamon                = vb2_ioctl_streamon,
 636         .vidioc_streamoff               = vb2_ioctl_streamoff,
 637 };
 638
 639 /* -----------------------------------------------------------------------------
 640  * V4L2 file operations
 641  */
 642
 643 static const struct v4l2_file_operations xvip_dma_fops = {
 644         .owner          = THIS_MODULE,
 645         .unlocked_ioctl = video_ioctl2,
 646         .open           = v4l2_fh_open,
 647         .release        = vb2_fop_release,
 648         .poll           = vb2_fop_poll,
 649         .mmap           = vb2_fop_mmap,
 650 };
 651
 652 /* -----------------------------------------------------------------------------
 653  * Xilinx Video DMA Core
 654  */
 655
 656 int xvip_dma_init(struct xvip_composite_device *xdev, struct xvip_dma *dma,
 657                   enum v4l2_buf_type type, unsigned int port)
 658 {
 659         char name[16];
 660         int ret;
 661
 662         dma->xdev = xdev;
 663         dma->port = port;
 664         mutex_init(&dma->lock);
 665         mutex_init(&dma->pipe.lock);
 666         INIT_LIST_HEAD(&dma->queued_bufs);
 667         spin_lock_init(&dma->queued_lock);
 668
 669         dma->fmtinfo = xvip_get_format_by_fourcc(XVIP_DMA_DEF_FORMAT);
 670         dma->format.pixelformat = dma->fmtinfo->fourcc;
 671         dma->format.colorspace = V4L2_COLORSPACE_SRGB;
 672         dma->format.field = V4L2_FIELD_NONE;
 673         dma->format.width = XVIP_DMA_DEF_WIDTH;
 674         dma->format.height = XVIP_DMA_DEF_HEIGHT;
 675         dma->format.bytesperline = dma->format.width * dma->fmtinfo->bpp;
 676         dma->format.sizeimage = dma->format.bytesperline * dma->format.height;
 677
 678         /* Initialize the media entity... */
 679         dma->pad.flags = type == V4L2_BUF_TYPE_VIDEO_CAPTURE
 680                        ? MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
 681
 682         ret = media_entity_init(&dma->video.entity, 1, &dma->pad, 0);
 683         if (ret < 0)
 684                 goto error;
 685
 686         /* ... and the video node... */
 687         dma->video.fops = &xvip_dma_fops;
 688         dma->video.v4l2_dev = &xdev->v4l2_dev;
 689         dma->video.queue = &dma->queue;
 690         snprintf(dma->video.name, sizeof(dma->video.name), "%s %s %u",
 691                  xdev->dev->of_node->name,
 692                  type == V4L2_BUF_TYPE_VIDEO_CAPTURE ? "output" : "input",
 693                  port);
 694         dma->video.vfl_type = VFL_TYPE_GRABBER;
 695         dma->video.vfl_dir = type == V4L2_BUF_TYPE_VIDEO_CAPTURE
 696                            ? VFL_DIR_RX : VFL_DIR_TX;
 697         dma->video.release = video_device_release_empty;
 698         dma->video.ioctl_ops = &xvip_dma_ioctl_ops;
 699         dma->video.lock = &dma->lock;
 700
 701         video_set_drvdata(&dma->video, dma);
 702
 703         /* ... and the buffers queue... */
 704         dma->alloc_ctx = vb2_dma_contig_init_ctx(dma->xdev->dev);
 705         if (IS_ERR(dma->alloc_ctx)) {
 706                 ret = PTR_ERR(dma->alloc_ctx);
 707                 goto error;
 708         }
 709
 710         /* Don't enable VB2_READ and VB2_WRITE, as using the read() and write()
 711          * V4L2 APIs would be inefficient. Testing on the command line with a
 712          * 'cat /dev/video?' thus won't be possible, but given that the driver
 713          * anyway requires a test tool to setup the pipeline before any video
 714          * stream can be started, requiring a specific V4L2 test tool as well
 715          * instead of 'cat' isn't really a drawback.
 716          */
 717         dma->queue.type = type;
 718         dma->queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
 719         dma->queue.lock = &dma->lock;
 720         dma->queue.drv_priv = dma;
 721         dma->queue.buf_struct_size = sizeof(struct xvip_dma_buffer);
 722         dma->queue.ops = &xvip_dma_queue_qops;
 723         dma->queue.mem_ops = &vb2_dma_contig_memops;
 724         dma->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC
 725                                    | V4L2_BUF_FLAG_TSTAMP_SRC_EOF;
 726         ret = vb2_queue_init(&dma->queue);
 727         if (ret < 0) {
 728                 dev_err(dma->xdev->dev, "failed to initialize VB2 queue\n");
 729                 goto error;
 730         }
 731
 732         /* ... and the DMA channel. */
 733         snprintf(name, sizeof(name), "port%u", port);
 734         dma->dma = dma_request_slave_channel(dma->xdev->dev, name);
 735         if (dma->dma == NULL) {
 736                 dev_err(dma->xdev->dev, "no VDMA channel found\n");
 737                 ret = -ENODEV;
 738                 goto error;
 739         }
 740
 741         dma->align = 1 << dma->dma->device->copy_align;
 742
 743         ret = video_register_device(&dma->video, VFL_TYPE_GRABBER, -1);
 744         if (ret < 0) {
 745                 dev_err(dma->xdev->dev, "failed to register video device\n");
 746                 goto error;
 747         }
 748
 749         return 0;
 750
 751 error:
 752         xvip_dma_cleanup(dma);
 753         return ret;
 754 }
 755
 756 void xvip_dma_cleanup(struct xvip_dma *dma)
 757 {
 758         if (video_is_registered(&dma->video))
 759                 video_unregister_device(&dma->video);
 760
 761         if (dma->dma)
 762                 dma_release_channel(dma->dma);
 763
 764         if (!IS_ERR_OR_NULL(dma->alloc_ctx))
 765                 vb2_dma_contig_cleanup_ctx(dma->alloc_ctx);
 766
 767         media_entity_cleanup(&dma->video.entity);
 768
 769         mutex_destroy(&dma->lock);
 770         mutex_destroy(&dma->pipe.lock);
 771 }