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 || !is_media_entity_v4l2_subdev(remote->entity)) 53 return NULL; 54 55 if (pad) 56 *pad = remote->index; 57 58 return media_entity_to_v4l2_subdev(remote->entity); 59 } 60 61 static int xvip_dma_verify_format(struct xvip_dma *dma) 62 { 63 struct v4l2_subdev_format fmt; 64 struct v4l2_subdev *subdev; 65 int ret; 66 67 subdev = xvip_dma_remote_subdev(&dma->pad, &fmt.pad); 68 if (subdev == NULL) 69 return -EPIPE; 70 71 fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE; 72 ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt); 73 if (ret < 0) 74 return ret == -ENOIOCTLCMD ? -EINVAL : ret; 75 76 if (dma->fmtinfo->code != fmt.format.code || 77 dma->format.height != fmt.format.height || 78 dma->format.width != fmt.format.width || 79 dma->format.colorspace != fmt.format.colorspace) 80 return -EINVAL; 81 82 return 0; 83 } 84 85 /* ----------------------------------------------------------------------------- 86 * Pipeline Stream Management 87 */ 88 89 /** 90 * xvip_pipeline_start_stop - Start ot stop streaming on a pipeline 91 * @pipe: The pipeline 92 * @start: Start (when true) or stop (when false) the pipeline 93 * 94 * Walk the entities chain starting at the pipeline output video node and start 95 * or stop all of them. 96 * 97 * Return: 0 if successful, or the return value of the failed video::s_stream 98 * operation otherwise. 99 */ 100 static int xvip_pipeline_start_stop(struct xvip_pipeline *pipe, bool start) 101 { 102 struct xvip_dma *dma = pipe->output; 103 struct media_entity *entity; 104 struct media_pad *pad; 105 struct v4l2_subdev *subdev; 106 int ret; 107 108 entity = &dma->video.entity; 109 while (1) { 110 pad = &entity->pads[0]; 111 if (!(pad->flags & MEDIA_PAD_FL_SINK)) 112 break; 113 114 pad = media_entity_remote_pad(pad); 115 if (!pad || !is_media_entity_v4l2_subdev(pad->entity)) 116 break; 117 118 entity = pad->entity; 119 subdev = media_entity_to_v4l2_subdev(entity); 120 121 ret = v4l2_subdev_call(subdev, video, s_stream, start); 122 if (start && ret < 0 && ret != -ENOIOCTLCMD) 123 return ret; 124 } 125 126 return 0; 127 } 128 129 /** 130 * xvip_pipeline_set_stream - Enable/disable streaming on a pipeline 131 * @pipe: The pipeline 132 * @on: Turn the stream on when true or off when false 133 * 134 * The pipeline is shared between all DMA engines connect at its input and 135 * output. While the stream state of DMA engines can be controlled 136 * independently, pipelines have a shared stream state that enable or disable 137 * all entities in the pipeline. For this reason the pipeline uses a streaming 138 * counter that tracks the number of DMA engines that have requested the stream 139 * to be enabled. 140 * 141 * When called with the @on argument set to true, this function will increment 142 * the pipeline streaming count. If the streaming count reaches the number of 143 * DMA engines in the pipeline it will enable all entities that belong to the 144 * pipeline. 145 * 146 * Similarly, when called with the @on argument set to false, this function will 147 * decrement the pipeline streaming count and disable all entities in the 148 * pipeline when the streaming count reaches zero. 149 * 150 * Return: 0 if successful, or the return value of the failed video::s_stream 151 * operation otherwise. Stopping the pipeline never fails. The pipeline state is 152 * not updated when the operation fails. 153 */ 154 static int xvip_pipeline_set_stream(struct xvip_pipeline *pipe, bool on) 155 { 156 int ret = 0; 157 158 mutex_lock(&pipe->lock); 159 160 if (on) { 161 if (pipe->stream_count == pipe->num_dmas - 1) { 162 ret = xvip_pipeline_start_stop(pipe, true); 163 if (ret < 0) 164 goto done; 165 } 166 pipe->stream_count++; 167 } else { 168 if (--pipe->stream_count == 0) 169 xvip_pipeline_start_stop(pipe, false); 170 } 171 172 done: 173 mutex_unlock(&pipe->lock); 174 return ret; 175 } 176 177 static int xvip_pipeline_validate(struct xvip_pipeline *pipe, 178 struct xvip_dma *start) 179 { 180 struct media_graph graph; 181 struct media_entity *entity = &start->video.entity; 182 struct media_device *mdev = entity->graph_obj.mdev; 183 unsigned int num_inputs = 0; 184 unsigned int num_outputs = 0; 185 int ret; 186 187 mutex_lock(&mdev->graph_mutex); 188 189 /* Walk the graph to locate the video nodes. */ 190 ret = media_graph_walk_init(&graph, mdev); 191 if (ret) { 192 mutex_unlock(&mdev->graph_mutex); 193 return ret; 194 } 195 196 media_graph_walk_start(&graph, entity); 197 198 while ((entity = media_graph_walk_next(&graph))) { 199 struct xvip_dma *dma; 200 201 if (entity->function != MEDIA_ENT_F_IO_V4L) 202 continue; 203 204 dma = to_xvip_dma(media_entity_to_video_device(entity)); 205 206 if (dma->pad.flags & MEDIA_PAD_FL_SINK) { 207 pipe->output = dma; 208 num_outputs++; 209 } else { 210 num_inputs++; 211 } 212 } 213 214 mutex_unlock(&mdev->graph_mutex); 215 216 media_graph_walk_cleanup(&graph); 217 218 /* We need exactly one output and zero or one input. */ 219 if (num_outputs != 1 || num_inputs > 1) 220 return -EPIPE; 221 222 pipe->num_dmas = num_inputs + num_outputs; 223 224 return 0; 225 } 226 227 static void __xvip_pipeline_cleanup(struct xvip_pipeline *pipe) 228 { 229 pipe->num_dmas = 0; 230 pipe->output = NULL; 231 } 232 233 /** 234 * xvip_pipeline_cleanup - Cleanup the pipeline after streaming 235 * @pipe: the pipeline 236 * 237 * Decrease the pipeline use count and clean it up if we were the last user. 238 */ 239 static void xvip_pipeline_cleanup(struct xvip_pipeline *pipe) 240 { 241 mutex_lock(&pipe->lock); 242 243 /* If we're the last user clean up the pipeline. */ 244 if (--pipe->use_count == 0) 245 __xvip_pipeline_cleanup(pipe); 246 247 mutex_unlock(&pipe->lock); 248 } 249 250 /** 251 * xvip_pipeline_prepare - Prepare the pipeline for streaming 252 * @pipe: the pipeline 253 * @dma: DMA engine at one end of the pipeline 254 * 255 * Validate the pipeline if no user exists yet, otherwise just increase the use 256 * count. 257 * 258 * Return: 0 if successful or -EPIPE if the pipeline is not valid. 259 */ 260 static int xvip_pipeline_prepare(struct xvip_pipeline *pipe, 261 struct xvip_dma *dma) 262 { 263 int ret; 264 265 mutex_lock(&pipe->lock); 266 267 /* If we're the first user validate and initialize the pipeline. */ 268 if (pipe->use_count == 0) { 269 ret = xvip_pipeline_validate(pipe, dma); 270 if (ret < 0) { 271 __xvip_pipeline_cleanup(pipe); 272 goto done; 273 } 274 } 275 276 pipe->use_count++; 277 ret = 0; 278 279 done: 280 mutex_unlock(&pipe->lock); 281 return ret; 282 } 283 284 /* ----------------------------------------------------------------------------- 285 * videobuf2 queue operations 286 */ 287 288 /** 289 * struct xvip_dma_buffer - Video DMA buffer 290 * @buf: vb2 buffer base object 291 * @queue: buffer list entry in the DMA engine queued buffers list 292 * @dma: DMA channel that uses the buffer 293 */ 294 struct xvip_dma_buffer { 295 struct vb2_v4l2_buffer buf; 296 struct list_head queue; 297 struct xvip_dma *dma; 298 }; 299 300 #define to_xvip_dma_buffer(vb) container_of(vb, struct xvip_dma_buffer, buf) 301 302 static void xvip_dma_complete(void *param) 303 { 304 struct xvip_dma_buffer *buf = param; 305 struct xvip_dma *dma = buf->dma; 306 307 spin_lock(&dma->queued_lock); 308 list_del(&buf->queue); 309 spin_unlock(&dma->queued_lock); 310 311 buf->buf.field = V4L2_FIELD_NONE; 312 buf->buf.sequence = dma->sequence++; 313 buf->buf.vb2_buf.timestamp = ktime_get_ns(); 314 vb2_set_plane_payload(&buf->buf.vb2_buf, 0, dma->format.sizeimage); 315 vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_DONE); 316 } 317 318 static int 319 xvip_dma_queue_setup(struct vb2_queue *vq, 320 unsigned int *nbuffers, unsigned int *nplanes, 321 unsigned int sizes[], struct device *alloc_devs[]) 322 { 323 struct xvip_dma *dma = vb2_get_drv_priv(vq); 324 325 /* Make sure the image size is large enough. */ 326 if (*nplanes) 327 return sizes[0] < dma->format.sizeimage ? -EINVAL : 0; 328 329 *nplanes = 1; 330 sizes[0] = dma->format.sizeimage; 331 332 return 0; 333 } 334 335 static int xvip_dma_buffer_prepare(struct vb2_buffer *vb) 336 { 337 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 338 struct xvip_dma *dma = vb2_get_drv_priv(vb->vb2_queue); 339 struct xvip_dma_buffer *buf = to_xvip_dma_buffer(vbuf); 340 341 buf->dma = dma; 342 343 return 0; 344 } 345 346 static void xvip_dma_buffer_queue(struct vb2_buffer *vb) 347 { 348 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 349 struct xvip_dma *dma = vb2_get_drv_priv(vb->vb2_queue); 350 struct xvip_dma_buffer *buf = to_xvip_dma_buffer(vbuf); 351 struct dma_async_tx_descriptor *desc; 352 dma_addr_t addr = vb2_dma_contig_plane_dma_addr(vb, 0); 353 u32 flags; 354 355 if (dma->queue.type == V4L2_BUF_TYPE_VIDEO_CAPTURE) { 356 flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK; 357 dma->xt.dir = DMA_DEV_TO_MEM; 358 dma->xt.src_sgl = false; 359 dma->xt.dst_sgl = true; 360 dma->xt.dst_start = addr; 361 } else { 362 flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK; 363 dma->xt.dir = DMA_MEM_TO_DEV; 364 dma->xt.src_sgl = true; 365 dma->xt.dst_sgl = false; 366 dma->xt.src_start = addr; 367 } 368 369 dma->xt.frame_size = 1; 370 dma->sgl[0].size = dma->format.width * dma->fmtinfo->bpp; 371 dma->sgl[0].icg = dma->format.bytesperline - dma->sgl[0].size; 372 dma->xt.numf = dma->format.height; 373 374 desc = dmaengine_prep_interleaved_dma(dma->dma, &dma->xt, flags); 375 if (!desc) { 376 dev_err(dma->xdev->dev, "Failed to prepare DMA transfer\n"); 377 vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_ERROR); 378 return; 379 } 380 desc->callback = xvip_dma_complete; 381 desc->callback_param = buf; 382 383 spin_lock_irq(&dma->queued_lock); 384 list_add_tail(&buf->queue, &dma->queued_bufs); 385 spin_unlock_irq(&dma->queued_lock); 386 387 dmaengine_submit(desc); 388 389 if (vb2_is_streaming(&dma->queue)) 390 dma_async_issue_pending(dma->dma); 391 } 392 393 static int xvip_dma_start_streaming(struct vb2_queue *vq, unsigned int count) 394 { 395 struct xvip_dma *dma = vb2_get_drv_priv(vq); 396 struct xvip_dma_buffer *buf, *nbuf; 397 struct xvip_pipeline *pipe; 398 int ret; 399 400 dma->sequence = 0; 401 402 /* 403 * Start streaming on the pipeline. No link touching an entity in the 404 * pipeline can be activated or deactivated once streaming is started. 405 * 406 * Use the pipeline object embedded in the first DMA object that starts 407 * streaming. 408 */ 409 pipe = dma->video.entity.pipe 410 ? to_xvip_pipeline(&dma->video.entity) : &dma->pipe; 411 412 ret = media_pipeline_start(&dma->video.entity, &pipe->pipe); 413 if (ret < 0) 414 goto error; 415 416 /* Verify that the configured format matches the output of the 417 * connected subdev. 418 */ 419 ret = xvip_dma_verify_format(dma); 420 if (ret < 0) 421 goto error_stop; 422 423 ret = xvip_pipeline_prepare(pipe, dma); 424 if (ret < 0) 425 goto error_stop; 426 427 /* Start the DMA engine. This must be done before starting the blocks 428 * in the pipeline to avoid DMA synchronization issues. 429 */ 430 dma_async_issue_pending(dma->dma); 431 432 /* Start the pipeline. */ 433 xvip_pipeline_set_stream(pipe, true); 434 435 return 0; 436 437 error_stop: 438 media_pipeline_stop(&dma->video.entity); 439 440 error: 441 /* Give back all queued buffers to videobuf2. */ 442 spin_lock_irq(&dma->queued_lock); 443 list_for_each_entry_safe(buf, nbuf, &dma->queued_bufs, queue) { 444 vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_QUEUED); 445 list_del(&buf->queue); 446 } 447 spin_unlock_irq(&dma->queued_lock); 448 449 return ret; 450 } 451 452 static void xvip_dma_stop_streaming(struct vb2_queue *vq) 453 { 454 struct xvip_dma *dma = vb2_get_drv_priv(vq); 455 struct xvip_pipeline *pipe = to_xvip_pipeline(&dma->video.entity); 456 struct xvip_dma_buffer *buf, *nbuf; 457 458 /* Stop the pipeline. */ 459 xvip_pipeline_set_stream(pipe, false); 460 461 /* Stop and reset the DMA engine. */ 462 dmaengine_terminate_all(dma->dma); 463 464 /* Cleanup the pipeline and mark it as being stopped. */ 465 xvip_pipeline_cleanup(pipe); 466 media_pipeline_stop(&dma->video.entity); 467 468 /* Give back all queued buffers to videobuf2. */ 469 spin_lock_irq(&dma->queued_lock); 470 list_for_each_entry_safe(buf, nbuf, &dma->queued_bufs, queue) { 471 vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_ERROR); 472 list_del(&buf->queue); 473 } 474 spin_unlock_irq(&dma->queued_lock); 475 } 476 477 static const struct vb2_ops xvip_dma_queue_qops = { 478 .queue_setup = xvip_dma_queue_setup, 479 .buf_prepare = xvip_dma_buffer_prepare, 480 .buf_queue = xvip_dma_buffer_queue, 481 .wait_prepare = vb2_ops_wait_prepare, 482 .wait_finish = vb2_ops_wait_finish, 483 .start_streaming = xvip_dma_start_streaming, 484 .stop_streaming = xvip_dma_stop_streaming, 485 }; 486 487 /* ----------------------------------------------------------------------------- 488 * V4L2 ioctls 489 */ 490 491 static int 492 xvip_dma_querycap(struct file *file, void *fh, struct v4l2_capability *cap) 493 { 494 struct v4l2_fh *vfh = file->private_data; 495 struct xvip_dma *dma = to_xvip_dma(vfh->vdev); 496 497 cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING 498 | dma->xdev->v4l2_caps; 499 500 if (dma->queue.type == V4L2_BUF_TYPE_VIDEO_CAPTURE) 501 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING; 502 else 503 cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING; 504 505 strlcpy(cap->driver, "xilinx-vipp", sizeof(cap->driver)); 506 strlcpy(cap->card, dma->video.name, sizeof(cap->card)); 507 snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s:%u", 508 dma->xdev->dev->of_node->name, dma->port); 509 510 return 0; 511 } 512 513 /* FIXME: without this callback function, some applications are not configured 514 * with correct formats, and it results in frames in wrong format. Whether this 515 * callback needs to be required is not clearly defined, so it should be 516 * clarified through the mailing list. 517 */ 518 static int 519 xvip_dma_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f) 520 { 521 struct v4l2_fh *vfh = file->private_data; 522 struct xvip_dma *dma = to_xvip_dma(vfh->vdev); 523 524 if (f->index > 0) 525 return -EINVAL; 526 527 f->pixelformat = dma->format.pixelformat; 528 strlcpy(f->description, dma->fmtinfo->description, 529 sizeof(f->description)); 530 531 return 0; 532 } 533 534 static int 535 xvip_dma_get_format(struct file *file, void *fh, struct v4l2_format *format) 536 { 537 struct v4l2_fh *vfh = file->private_data; 538 struct xvip_dma *dma = to_xvip_dma(vfh->vdev); 539 540 format->fmt.pix = dma->format; 541 542 return 0; 543 } 544 545 static void 546 __xvip_dma_try_format(struct xvip_dma *dma, struct v4l2_pix_format *pix, 547 const struct xvip_video_format **fmtinfo) 548 { 549 const struct xvip_video_format *info; 550 unsigned int min_width; 551 unsigned int max_width; 552 unsigned int min_bpl; 553 unsigned int max_bpl; 554 unsigned int width; 555 unsigned int align; 556 unsigned int bpl; 557 558 /* Retrieve format information and select the default format if the 559 * requested format isn't supported. 560 */ 561 info = xvip_get_format_by_fourcc(pix->pixelformat); 562 if (IS_ERR(info)) 563 info = xvip_get_format_by_fourcc(XVIP_DMA_DEF_FORMAT); 564 565 pix->pixelformat = info->fourcc; 566 pix->field = V4L2_FIELD_NONE; 567 568 /* The transfer alignment requirements are expressed in bytes. Compute 569 * the minimum and maximum values, clamp the requested width and convert 570 * it back to pixels. 571 */ 572 align = lcm(dma->align, info->bpp); 573 min_width = roundup(XVIP_DMA_MIN_WIDTH, align); 574 max_width = rounddown(XVIP_DMA_MAX_WIDTH, align); 575 width = rounddown(pix->width * info->bpp, align); 576 577 pix->width = clamp(width, min_width, max_width) / info->bpp; 578 pix->height = clamp(pix->height, XVIP_DMA_MIN_HEIGHT, 579 XVIP_DMA_MAX_HEIGHT); 580 581 /* Clamp the requested bytes per line value. If the maximum bytes per 582 * line value is zero, the module doesn't support user configurable line 583 * sizes. Override the requested value with the minimum in that case. 584 */ 585 min_bpl = pix->width * info->bpp; 586 max_bpl = rounddown(XVIP_DMA_MAX_WIDTH, dma->align); 587 bpl = rounddown(pix->bytesperline, dma->align); 588 589 pix->bytesperline = clamp(bpl, min_bpl, max_bpl); 590 pix->sizeimage = pix->bytesperline * pix->height; 591 592 if (fmtinfo) 593 *fmtinfo = info; 594 } 595 596 static int 597 xvip_dma_try_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); 601 602 __xvip_dma_try_format(dma, &format->fmt.pix, NULL); 603 return 0; 604 } 605 606 static int 607 xvip_dma_set_format(struct file *file, void *fh, struct v4l2_format *format) 608 { 609 struct v4l2_fh *vfh = file->private_data; 610 struct xvip_dma *dma = to_xvip_dma(vfh->vdev); 611 const struct xvip_video_format *info; 612 613 __xvip_dma_try_format(dma, &format->fmt.pix, &info); 614 615 if (vb2_is_busy(&dma->queue)) 616 return -EBUSY; 617 618 dma->format = format->fmt.pix; 619 dma->fmtinfo = info; 620 621 return 0; 622 } 623 624 static const struct v4l2_ioctl_ops xvip_dma_ioctl_ops = { 625 .vidioc_querycap = xvip_dma_querycap, 626 .vidioc_enum_fmt_vid_cap = xvip_dma_enum_format, 627 .vidioc_g_fmt_vid_cap = xvip_dma_get_format, 628 .vidioc_g_fmt_vid_out = xvip_dma_get_format, 629 .vidioc_s_fmt_vid_cap = xvip_dma_set_format, 630 .vidioc_s_fmt_vid_out = xvip_dma_set_format, 631 .vidioc_try_fmt_vid_cap = xvip_dma_try_format, 632 .vidioc_try_fmt_vid_out = xvip_dma_try_format, 633 .vidioc_reqbufs = vb2_ioctl_reqbufs, 634 .vidioc_querybuf = vb2_ioctl_querybuf, 635 .vidioc_qbuf = vb2_ioctl_qbuf, 636 .vidioc_dqbuf = vb2_ioctl_dqbuf, 637 .vidioc_create_bufs = vb2_ioctl_create_bufs, 638 .vidioc_expbuf = vb2_ioctl_expbuf, 639 .vidioc_streamon = vb2_ioctl_streamon, 640 .vidioc_streamoff = vb2_ioctl_streamoff, 641 }; 642 643 /* ----------------------------------------------------------------------------- 644 * V4L2 file operations 645 */ 646 647 static const struct v4l2_file_operations xvip_dma_fops = { 648 .owner = THIS_MODULE, 649 .unlocked_ioctl = video_ioctl2, 650 .open = v4l2_fh_open, 651 .release = vb2_fop_release, 652 .poll = vb2_fop_poll, 653 .mmap = vb2_fop_mmap, 654 }; 655 656 /* ----------------------------------------------------------------------------- 657 * Xilinx Video DMA Core 658 */ 659 660 int xvip_dma_init(struct xvip_composite_device *xdev, struct xvip_dma *dma, 661 enum v4l2_buf_type type, unsigned int port) 662 { 663 char name[16]; 664 int ret; 665 666 dma->xdev = xdev; 667 dma->port = port; 668 mutex_init(&dma->lock); 669 mutex_init(&dma->pipe.lock); 670 INIT_LIST_HEAD(&dma->queued_bufs); 671 spin_lock_init(&dma->queued_lock); 672 673 dma->fmtinfo = xvip_get_format_by_fourcc(XVIP_DMA_DEF_FORMAT); 674 dma->format.pixelformat = dma->fmtinfo->fourcc; 675 dma->format.colorspace = V4L2_COLORSPACE_SRGB; 676 dma->format.field = V4L2_FIELD_NONE; 677 dma->format.width = XVIP_DMA_DEF_WIDTH; 678 dma->format.height = XVIP_DMA_DEF_HEIGHT; 679 dma->format.bytesperline = dma->format.width * dma->fmtinfo->bpp; 680 dma->format.sizeimage = dma->format.bytesperline * dma->format.height; 681 682 /* Initialize the media entity... */ 683 dma->pad.flags = type == V4L2_BUF_TYPE_VIDEO_CAPTURE 684 ? MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE; 685 686 ret = media_entity_pads_init(&dma->video.entity, 1, &dma->pad); 687 if (ret < 0) 688 goto error; 689 690 /* ... and the video node... */ 691 dma->video.fops = &xvip_dma_fops; 692 dma->video.v4l2_dev = &xdev->v4l2_dev; 693 dma->video.queue = &dma->queue; 694 snprintf(dma->video.name, sizeof(dma->video.name), "%s %s %u", 695 xdev->dev->of_node->name, 696 type == V4L2_BUF_TYPE_VIDEO_CAPTURE ? "output" : "input", 697 port); 698 dma->video.vfl_type = VFL_TYPE_GRABBER; 699 dma->video.vfl_dir = type == V4L2_BUF_TYPE_VIDEO_CAPTURE 700 ? VFL_DIR_RX : VFL_DIR_TX; 701 dma->video.release = video_device_release_empty; 702 dma->video.ioctl_ops = &xvip_dma_ioctl_ops; 703 dma->video.lock = &dma->lock; 704 705 video_set_drvdata(&dma->video, dma); 706 707 /* ... and the buffers queue... */ 708 /* Don't enable VB2_READ and VB2_WRITE, as using the read() and write() 709 * V4L2 APIs would be inefficient. Testing on the command line with a 710 * 'cat /dev/video?' thus won't be possible, but given that the driver 711 * anyway requires a test tool to setup the pipeline before any video 712 * stream can be started, requiring a specific V4L2 test tool as well 713 * instead of 'cat' isn't really a drawback. 714 */ 715 dma->queue.type = type; 716 dma->queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF; 717 dma->queue.lock = &dma->lock; 718 dma->queue.drv_priv = dma; 719 dma->queue.buf_struct_size = sizeof(struct xvip_dma_buffer); 720 dma->queue.ops = &xvip_dma_queue_qops; 721 dma->queue.mem_ops = &vb2_dma_contig_memops; 722 dma->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC 723 | V4L2_BUF_FLAG_TSTAMP_SRC_EOF; 724 dma->queue.dev = dma->xdev->dev; 725 ret = vb2_queue_init(&dma->queue); 726 if (ret < 0) { 727 dev_err(dma->xdev->dev, "failed to initialize VB2 queue\n"); 728 goto error; 729 } 730 731 /* ... and the DMA channel. */ 732 snprintf(name, sizeof(name), "port%u", port); 733 dma->dma = dma_request_slave_channel(dma->xdev->dev, name); 734 if (dma->dma == NULL) { 735 dev_err(dma->xdev->dev, "no VDMA channel found\n"); 736 ret = -ENODEV; 737 goto error; 738 } 739 740 dma->align = 1 << dma->dma->device->copy_align; 741 742 ret = video_register_device(&dma->video, VFL_TYPE_GRABBER, -1); 743 if (ret < 0) { 744 dev_err(dma->xdev->dev, "failed to register video device\n"); 745 goto error; 746 } 747 748 return 0; 749 750 error: 751 xvip_dma_cleanup(dma); 752 return ret; 753 } 754 755 void xvip_dma_cleanup(struct xvip_dma *dma) 756 { 757 if (video_is_registered(&dma->video)) 758 video_unregister_device(&dma->video); 759 760 if (dma->dma) 761 dma_release_channel(dma->dma); 762 763 media_entity_cleanup(&dma->video.entity); 764 765 mutex_destroy(&dma->lock); 766 mutex_destroy(&dma->pipe.lock); 767 } 768