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df330515 LP |
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 | ||
4a655466 | 15 | #include <linux/dma/xilinx_dma.h> |
df330515 LP |
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> | |
c139990e | 25 | #include <media/videobuf2-v4l2.h> |
df330515 LP |
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); | |
3efdf62c | 52 | if (!remote || !is_media_entity_v4l2_subdev(remote->entity)) |
df330515 LP |
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); | |
3efdf62c | 115 | if (!pad || !is_media_entity_v4l2_subdev(pad->entity)) |
df330515 LP |
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_entity_graph graph; | |
181 | struct media_entity *entity = &start->video.entity; | |
d10c9894 | 182 | struct media_device *mdev = entity->graph_obj.mdev; |
df330515 LP |
183 | unsigned int num_inputs = 0; |
184 | unsigned int num_outputs = 0; | |
08613c54 | 185 | int ret; |
df330515 LP |
186 | |
187 | mutex_lock(&mdev->graph_mutex); | |
188 | ||
189 | /* Walk the graph to locate the video nodes. */ | |
08613c54 SA |
190 | ret = media_entity_graph_walk_init(&graph, entity->graph_obj.mdev); |
191 | if (ret) { | |
192 | mutex_unlock(&mdev->graph_mutex); | |
193 | return ret; | |
194 | } | |
195 | ||
df330515 LP |
196 | media_entity_graph_walk_start(&graph, entity); |
197 | ||
198 | while ((entity = media_entity_graph_walk_next(&graph))) { | |
199 | struct xvip_dma *dma; | |
200 | ||
4ca72efa | 201 | if (entity->function != MEDIA_ENT_F_IO_V4L) |
df330515 LP |
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 | ||
08613c54 SA |
216 | media_entity_graph_walk_cleanup(&graph); |
217 | ||
df330515 LP |
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 { | |
2d700715 | 295 | struct vb2_v4l2_buffer buf; |
df330515 LP |
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 | ||
2d700715 JS |
311 | buf->buf.field = V4L2_FIELD_NONE; |
312 | buf->buf.sequence = dma->sequence++; | |
d6dd645e | 313 | buf->buf.vb2_buf.timestamp = ktime_get_ns(); |
2d700715 JS |
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); | |
df330515 LP |
316 | } |
317 | ||
318 | static int | |
df9ecb0c | 319 | xvip_dma_queue_setup(struct vb2_queue *vq, |
df330515 | 320 | unsigned int *nbuffers, unsigned int *nplanes, |
36c0f8b3 | 321 | unsigned int sizes[], struct device *alloc_devs[]) |
df330515 LP |
322 | { |
323 | struct xvip_dma *dma = vb2_get_drv_priv(vq); | |
324 | ||
325 | /* Make sure the image size is large enough. */ | |
df9ecb0c HV |
326 | if (*nplanes) |
327 | return sizes[0] < dma->format.sizeimage ? -EINVAL : 0; | |
df330515 LP |
328 | |
329 | *nplanes = 1; | |
df9ecb0c | 330 | sizes[0] = dma->format.sizeimage; |
df330515 LP |
331 | |
332 | return 0; | |
333 | } | |
334 | ||
335 | static int xvip_dma_buffer_prepare(struct vb2_buffer *vb) | |
336 | { | |
2d700715 | 337 | struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); |
df330515 | 338 | struct xvip_dma *dma = vb2_get_drv_priv(vb->vb2_queue); |
2d700715 | 339 | struct xvip_dma_buffer *buf = to_xvip_dma_buffer(vbuf); |
df330515 LP |
340 | |
341 | buf->dma = dma; | |
342 | ||
343 | return 0; | |
344 | } | |
345 | ||
346 | static void xvip_dma_buffer_queue(struct vb2_buffer *vb) | |
347 | { | |
2d700715 | 348 | struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); |
df330515 | 349 | struct xvip_dma *dma = vb2_get_drv_priv(vb->vb2_queue); |
2d700715 | 350 | struct xvip_dma_buffer *buf = to_xvip_dma_buffer(vbuf); |
df330515 LP |
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"); | |
2d700715 | 377 | vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_ERROR); |
df330515 LP |
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_entity_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_entity_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) { | |
2d700715 | 444 | vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_QUEUED); |
df330515 LP |
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_entity_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) { | |
2d700715 | 471 | vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_ERROR); |
df330515 LP |
472 | list_del(&buf->queue); |
473 | } | |
474 | spin_unlock_irq(&dma->queued_lock); | |
475 | } | |
476 | ||
477 | static 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 | { | |
550f45bc | 663 | char name[16]; |
df330515 LP |
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 | ||
ab22e77c | 686 | ret = media_entity_pads_init(&dma->video.entity, 1, &dma->pad); |
df330515 LP |
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... */ | |
df330515 LP |
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; | |
dce57314 | 724 | dma->queue.dev = dma->xdev->dev; |
df330515 LP |
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. */ | |
550f45bc | 732 | snprintf(name, sizeof(name), "port%u", port); |
df330515 LP |
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 | ||
df330515 LP |
763 | media_entity_cleanup(&dma->video.entity); |
764 | ||
765 | mutex_destroy(&dma->lock); | |
766 | mutex_destroy(&dma->pipe.lock); | |
767 | } |