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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); | |
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 { | |
2d700715 | 288 | struct vb2_v4l2_buffer buf; |
df330515 LP |
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 | ||
2d700715 JS |
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); | |
df330515 LP |
309 | } |
310 | ||
311 | static int | |
df9ecb0c | 312 | xvip_dma_queue_setup(struct vb2_queue *vq, |
df330515 LP |
313 | unsigned int *nbuffers, unsigned int *nplanes, |
314 | unsigned int sizes[], void *alloc_ctxs[]) | |
315 | { | |
316 | struct xvip_dma *dma = vb2_get_drv_priv(vq); | |
317 | ||
df9ecb0c | 318 | alloc_ctxs[0] = dma->alloc_ctx; |
df330515 | 319 | /* Make sure the image size is large enough. */ |
df9ecb0c HV |
320 | if (*nplanes) |
321 | return sizes[0] < dma->format.sizeimage ? -EINVAL : 0; | |
df330515 LP |
322 | |
323 | *nplanes = 1; | |
df9ecb0c | 324 | sizes[0] = dma->format.sizeimage; |
df330515 LP |
325 | |
326 | return 0; | |
327 | } | |
328 | ||
329 | static int xvip_dma_buffer_prepare(struct vb2_buffer *vb) | |
330 | { | |
2d700715 | 331 | struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); |
df330515 | 332 | struct xvip_dma *dma = vb2_get_drv_priv(vb->vb2_queue); |
2d700715 | 333 | struct xvip_dma_buffer *buf = to_xvip_dma_buffer(vbuf); |
df330515 LP |
334 | |
335 | buf->dma = dma; | |
336 | ||
337 | return 0; | |
338 | } | |
339 | ||
340 | static void xvip_dma_buffer_queue(struct vb2_buffer *vb) | |
341 | { | |
2d700715 | 342 | struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); |
df330515 | 343 | struct xvip_dma *dma = vb2_get_drv_priv(vb->vb2_queue); |
2d700715 | 344 | struct xvip_dma_buffer *buf = to_xvip_dma_buffer(vbuf); |
df330515 LP |
345 | struct dma_async_tx_descriptor *desc; |
346 | dma_addr_t addr = vb2_dma_contig_plane_dma_addr(vb, 0); | |
347 | u32 flags; | |
348 | ||
349 | if (dma->queue.type == V4L2_BUF_TYPE_VIDEO_CAPTURE) { | |
350 | flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK; | |
351 | dma->xt.dir = DMA_DEV_TO_MEM; | |
352 | dma->xt.src_sgl = false; | |
353 | dma->xt.dst_sgl = true; | |
354 | dma->xt.dst_start = addr; | |
355 | } else { | |
356 | flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK; | |
357 | dma->xt.dir = DMA_MEM_TO_DEV; | |
358 | dma->xt.src_sgl = true; | |
359 | dma->xt.dst_sgl = false; | |
360 | dma->xt.src_start = addr; | |
361 | } | |
362 | ||
363 | dma->xt.frame_size = 1; | |
364 | dma->sgl[0].size = dma->format.width * dma->fmtinfo->bpp; | |
365 | dma->sgl[0].icg = dma->format.bytesperline - dma->sgl[0].size; | |
366 | dma->xt.numf = dma->format.height; | |
367 | ||
368 | desc = dmaengine_prep_interleaved_dma(dma->dma, &dma->xt, flags); | |
369 | if (!desc) { | |
370 | dev_err(dma->xdev->dev, "Failed to prepare DMA transfer\n"); | |
2d700715 | 371 | vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_ERROR); |
df330515 LP |
372 | return; |
373 | } | |
374 | desc->callback = xvip_dma_complete; | |
375 | desc->callback_param = buf; | |
376 | ||
377 | spin_lock_irq(&dma->queued_lock); | |
378 | list_add_tail(&buf->queue, &dma->queued_bufs); | |
379 | spin_unlock_irq(&dma->queued_lock); | |
380 | ||
381 | dmaengine_submit(desc); | |
382 | ||
383 | if (vb2_is_streaming(&dma->queue)) | |
384 | dma_async_issue_pending(dma->dma); | |
385 | } | |
386 | ||
387 | static int xvip_dma_start_streaming(struct vb2_queue *vq, unsigned int count) | |
388 | { | |
389 | struct xvip_dma *dma = vb2_get_drv_priv(vq); | |
390 | struct xvip_dma_buffer *buf, *nbuf; | |
391 | struct xvip_pipeline *pipe; | |
392 | int ret; | |
393 | ||
394 | dma->sequence = 0; | |
395 | ||
396 | /* | |
397 | * Start streaming on the pipeline. No link touching an entity in the | |
398 | * pipeline can be activated or deactivated once streaming is started. | |
399 | * | |
400 | * Use the pipeline object embedded in the first DMA object that starts | |
401 | * streaming. | |
402 | */ | |
403 | pipe = dma->video.entity.pipe | |
404 | ? to_xvip_pipeline(&dma->video.entity) : &dma->pipe; | |
405 | ||
406 | ret = media_entity_pipeline_start(&dma->video.entity, &pipe->pipe); | |
407 | if (ret < 0) | |
408 | goto error; | |
409 | ||
410 | /* Verify that the configured format matches the output of the | |
411 | * connected subdev. | |
412 | */ | |
413 | ret = xvip_dma_verify_format(dma); | |
414 | if (ret < 0) | |
415 | goto error_stop; | |
416 | ||
417 | ret = xvip_pipeline_prepare(pipe, dma); | |
418 | if (ret < 0) | |
419 | goto error_stop; | |
420 | ||
421 | /* Start the DMA engine. This must be done before starting the blocks | |
422 | * in the pipeline to avoid DMA synchronization issues. | |
423 | */ | |
424 | dma_async_issue_pending(dma->dma); | |
425 | ||
426 | /* Start the pipeline. */ | |
427 | xvip_pipeline_set_stream(pipe, true); | |
428 | ||
429 | return 0; | |
430 | ||
431 | error_stop: | |
432 | media_entity_pipeline_stop(&dma->video.entity); | |
433 | ||
434 | error: | |
435 | /* Give back all queued buffers to videobuf2. */ | |
436 | spin_lock_irq(&dma->queued_lock); | |
437 | list_for_each_entry_safe(buf, nbuf, &dma->queued_bufs, queue) { | |
2d700715 | 438 | vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_QUEUED); |
df330515 LP |
439 | list_del(&buf->queue); |
440 | } | |
441 | spin_unlock_irq(&dma->queued_lock); | |
442 | ||
443 | return ret; | |
444 | } | |
445 | ||
446 | static void xvip_dma_stop_streaming(struct vb2_queue *vq) | |
447 | { | |
448 | struct xvip_dma *dma = vb2_get_drv_priv(vq); | |
449 | struct xvip_pipeline *pipe = to_xvip_pipeline(&dma->video.entity); | |
450 | struct xvip_dma_buffer *buf, *nbuf; | |
451 | ||
452 | /* Stop the pipeline. */ | |
453 | xvip_pipeline_set_stream(pipe, false); | |
454 | ||
455 | /* Stop and reset the DMA engine. */ | |
456 | dmaengine_terminate_all(dma->dma); | |
457 | ||
458 | /* Cleanup the pipeline and mark it as being stopped. */ | |
459 | xvip_pipeline_cleanup(pipe); | |
460 | media_entity_pipeline_stop(&dma->video.entity); | |
461 | ||
462 | /* Give back all queued buffers to videobuf2. */ | |
463 | spin_lock_irq(&dma->queued_lock); | |
464 | list_for_each_entry_safe(buf, nbuf, &dma->queued_bufs, queue) { | |
2d700715 | 465 | vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_ERROR); |
df330515 LP |
466 | list_del(&buf->queue); |
467 | } | |
468 | spin_unlock_irq(&dma->queued_lock); | |
469 | } | |
470 | ||
471 | static struct vb2_ops xvip_dma_queue_qops = { | |
472 | .queue_setup = xvip_dma_queue_setup, | |
473 | .buf_prepare = xvip_dma_buffer_prepare, | |
474 | .buf_queue = xvip_dma_buffer_queue, | |
475 | .wait_prepare = vb2_ops_wait_prepare, | |
476 | .wait_finish = vb2_ops_wait_finish, | |
477 | .start_streaming = xvip_dma_start_streaming, | |
478 | .stop_streaming = xvip_dma_stop_streaming, | |
479 | }; | |
480 | ||
481 | /* ----------------------------------------------------------------------------- | |
482 | * V4L2 ioctls | |
483 | */ | |
484 | ||
485 | static int | |
486 | xvip_dma_querycap(struct file *file, void *fh, struct v4l2_capability *cap) | |
487 | { | |
488 | struct v4l2_fh *vfh = file->private_data; | |
489 | struct xvip_dma *dma = to_xvip_dma(vfh->vdev); | |
490 | ||
491 | cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING | |
492 | | dma->xdev->v4l2_caps; | |
493 | ||
494 | if (dma->queue.type == V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
495 | cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING; | |
496 | else | |
497 | cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING; | |
498 | ||
499 | strlcpy(cap->driver, "xilinx-vipp", sizeof(cap->driver)); | |
500 | strlcpy(cap->card, dma->video.name, sizeof(cap->card)); | |
501 | snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s:%u", | |
502 | dma->xdev->dev->of_node->name, dma->port); | |
503 | ||
504 | return 0; | |
505 | } | |
506 | ||
507 | /* FIXME: without this callback function, some applications are not configured | |
508 | * with correct formats, and it results in frames in wrong format. Whether this | |
509 | * callback needs to be required is not clearly defined, so it should be | |
510 | * clarified through the mailing list. | |
511 | */ | |
512 | static int | |
513 | xvip_dma_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f) | |
514 | { | |
515 | struct v4l2_fh *vfh = file->private_data; | |
516 | struct xvip_dma *dma = to_xvip_dma(vfh->vdev); | |
517 | ||
518 | if (f->index > 0) | |
519 | return -EINVAL; | |
520 | ||
521 | f->pixelformat = dma->format.pixelformat; | |
522 | strlcpy(f->description, dma->fmtinfo->description, | |
523 | sizeof(f->description)); | |
524 | ||
525 | return 0; | |
526 | } | |
527 | ||
528 | static int | |
529 | xvip_dma_get_format(struct file *file, void *fh, struct v4l2_format *format) | |
530 | { | |
531 | struct v4l2_fh *vfh = file->private_data; | |
532 | struct xvip_dma *dma = to_xvip_dma(vfh->vdev); | |
533 | ||
534 | format->fmt.pix = dma->format; | |
535 | ||
536 | return 0; | |
537 | } | |
538 | ||
539 | static void | |
540 | __xvip_dma_try_format(struct xvip_dma *dma, struct v4l2_pix_format *pix, | |
541 | const struct xvip_video_format **fmtinfo) | |
542 | { | |
543 | const struct xvip_video_format *info; | |
544 | unsigned int min_width; | |
545 | unsigned int max_width; | |
546 | unsigned int min_bpl; | |
547 | unsigned int max_bpl; | |
548 | unsigned int width; | |
549 | unsigned int align; | |
550 | unsigned int bpl; | |
551 | ||
552 | /* Retrieve format information and select the default format if the | |
553 | * requested format isn't supported. | |
554 | */ | |
555 | info = xvip_get_format_by_fourcc(pix->pixelformat); | |
556 | if (IS_ERR(info)) | |
557 | info = xvip_get_format_by_fourcc(XVIP_DMA_DEF_FORMAT); | |
558 | ||
559 | pix->pixelformat = info->fourcc; | |
560 | pix->field = V4L2_FIELD_NONE; | |
561 | ||
562 | /* The transfer alignment requirements are expressed in bytes. Compute | |
563 | * the minimum and maximum values, clamp the requested width and convert | |
564 | * it back to pixels. | |
565 | */ | |
566 | align = lcm(dma->align, info->bpp); | |
567 | min_width = roundup(XVIP_DMA_MIN_WIDTH, align); | |
568 | max_width = rounddown(XVIP_DMA_MAX_WIDTH, align); | |
569 | width = rounddown(pix->width * info->bpp, align); | |
570 | ||
571 | pix->width = clamp(width, min_width, max_width) / info->bpp; | |
572 | pix->height = clamp(pix->height, XVIP_DMA_MIN_HEIGHT, | |
573 | XVIP_DMA_MAX_HEIGHT); | |
574 | ||
575 | /* Clamp the requested bytes per line value. If the maximum bytes per | |
576 | * line value is zero, the module doesn't support user configurable line | |
577 | * sizes. Override the requested value with the minimum in that case. | |
578 | */ | |
579 | min_bpl = pix->width * info->bpp; | |
580 | max_bpl = rounddown(XVIP_DMA_MAX_WIDTH, dma->align); | |
581 | bpl = rounddown(pix->bytesperline, dma->align); | |
582 | ||
583 | pix->bytesperline = clamp(bpl, min_bpl, max_bpl); | |
584 | pix->sizeimage = pix->bytesperline * pix->height; | |
585 | ||
586 | if (fmtinfo) | |
587 | *fmtinfo = info; | |
588 | } | |
589 | ||
590 | static int | |
591 | xvip_dma_try_format(struct file *file, void *fh, struct v4l2_format *format) | |
592 | { | |
593 | struct v4l2_fh *vfh = file->private_data; | |
594 | struct xvip_dma *dma = to_xvip_dma(vfh->vdev); | |
595 | ||
596 | __xvip_dma_try_format(dma, &format->fmt.pix, NULL); | |
597 | return 0; | |
598 | } | |
599 | ||
600 | static int | |
601 | xvip_dma_set_format(struct file *file, void *fh, struct v4l2_format *format) | |
602 | { | |
603 | struct v4l2_fh *vfh = file->private_data; | |
604 | struct xvip_dma *dma = to_xvip_dma(vfh->vdev); | |
605 | const struct xvip_video_format *info; | |
606 | ||
607 | __xvip_dma_try_format(dma, &format->fmt.pix, &info); | |
608 | ||
609 | if (vb2_is_busy(&dma->queue)) | |
610 | return -EBUSY; | |
611 | ||
612 | dma->format = format->fmt.pix; | |
613 | dma->fmtinfo = info; | |
614 | ||
615 | return 0; | |
616 | } | |
617 | ||
618 | static const struct v4l2_ioctl_ops xvip_dma_ioctl_ops = { | |
619 | .vidioc_querycap = xvip_dma_querycap, | |
620 | .vidioc_enum_fmt_vid_cap = xvip_dma_enum_format, | |
621 | .vidioc_g_fmt_vid_cap = xvip_dma_get_format, | |
622 | .vidioc_g_fmt_vid_out = xvip_dma_get_format, | |
623 | .vidioc_s_fmt_vid_cap = xvip_dma_set_format, | |
624 | .vidioc_s_fmt_vid_out = xvip_dma_set_format, | |
625 | .vidioc_try_fmt_vid_cap = xvip_dma_try_format, | |
626 | .vidioc_try_fmt_vid_out = xvip_dma_try_format, | |
627 | .vidioc_reqbufs = vb2_ioctl_reqbufs, | |
628 | .vidioc_querybuf = vb2_ioctl_querybuf, | |
629 | .vidioc_qbuf = vb2_ioctl_qbuf, | |
630 | .vidioc_dqbuf = vb2_ioctl_dqbuf, | |
631 | .vidioc_create_bufs = vb2_ioctl_create_bufs, | |
632 | .vidioc_expbuf = vb2_ioctl_expbuf, | |
633 | .vidioc_streamon = vb2_ioctl_streamon, | |
634 | .vidioc_streamoff = vb2_ioctl_streamoff, | |
635 | }; | |
636 | ||
637 | /* ----------------------------------------------------------------------------- | |
638 | * V4L2 file operations | |
639 | */ | |
640 | ||
641 | static const struct v4l2_file_operations xvip_dma_fops = { | |
642 | .owner = THIS_MODULE, | |
643 | .unlocked_ioctl = video_ioctl2, | |
644 | .open = v4l2_fh_open, | |
645 | .release = vb2_fop_release, | |
646 | .poll = vb2_fop_poll, | |
647 | .mmap = vb2_fop_mmap, | |
648 | }; | |
649 | ||
650 | /* ----------------------------------------------------------------------------- | |
651 | * Xilinx Video DMA Core | |
652 | */ | |
653 | ||
654 | int xvip_dma_init(struct xvip_composite_device *xdev, struct xvip_dma *dma, | |
655 | enum v4l2_buf_type type, unsigned int port) | |
656 | { | |
550f45bc | 657 | char name[16]; |
df330515 LP |
658 | int ret; |
659 | ||
660 | dma->xdev = xdev; | |
661 | dma->port = port; | |
662 | mutex_init(&dma->lock); | |
663 | mutex_init(&dma->pipe.lock); | |
664 | INIT_LIST_HEAD(&dma->queued_bufs); | |
665 | spin_lock_init(&dma->queued_lock); | |
666 | ||
667 | dma->fmtinfo = xvip_get_format_by_fourcc(XVIP_DMA_DEF_FORMAT); | |
668 | dma->format.pixelformat = dma->fmtinfo->fourcc; | |
669 | dma->format.colorspace = V4L2_COLORSPACE_SRGB; | |
670 | dma->format.field = V4L2_FIELD_NONE; | |
671 | dma->format.width = XVIP_DMA_DEF_WIDTH; | |
672 | dma->format.height = XVIP_DMA_DEF_HEIGHT; | |
673 | dma->format.bytesperline = dma->format.width * dma->fmtinfo->bpp; | |
674 | dma->format.sizeimage = dma->format.bytesperline * dma->format.height; | |
675 | ||
676 | /* Initialize the media entity... */ | |
677 | dma->pad.flags = type == V4L2_BUF_TYPE_VIDEO_CAPTURE | |
678 | ? MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE; | |
679 | ||
680 | ret = media_entity_init(&dma->video.entity, 1, &dma->pad, 0); | |
681 | if (ret < 0) | |
682 | goto error; | |
683 | ||
684 | /* ... and the video node... */ | |
685 | dma->video.fops = &xvip_dma_fops; | |
686 | dma->video.v4l2_dev = &xdev->v4l2_dev; | |
687 | dma->video.queue = &dma->queue; | |
688 | snprintf(dma->video.name, sizeof(dma->video.name), "%s %s %u", | |
689 | xdev->dev->of_node->name, | |
690 | type == V4L2_BUF_TYPE_VIDEO_CAPTURE ? "output" : "input", | |
691 | port); | |
692 | dma->video.vfl_type = VFL_TYPE_GRABBER; | |
693 | dma->video.vfl_dir = type == V4L2_BUF_TYPE_VIDEO_CAPTURE | |
694 | ? VFL_DIR_RX : VFL_DIR_TX; | |
695 | dma->video.release = video_device_release_empty; | |
696 | dma->video.ioctl_ops = &xvip_dma_ioctl_ops; | |
697 | dma->video.lock = &dma->lock; | |
698 | ||
699 | video_set_drvdata(&dma->video, dma); | |
700 | ||
701 | /* ... and the buffers queue... */ | |
702 | dma->alloc_ctx = vb2_dma_contig_init_ctx(dma->xdev->dev); | |
e31f8f00 DC |
703 | if (IS_ERR(dma->alloc_ctx)) { |
704 | ret = PTR_ERR(dma->alloc_ctx); | |
df330515 | 705 | goto error; |
e31f8f00 | 706 | } |
df330515 LP |
707 | |
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 | ret = vb2_queue_init(&dma->queue); | |
725 | if (ret < 0) { | |
726 | dev_err(dma->xdev->dev, "failed to initialize VB2 queue\n"); | |
727 | goto error; | |
728 | } | |
729 | ||
730 | /* ... and the DMA channel. */ | |
550f45bc | 731 | snprintf(name, sizeof(name), "port%u", port); |
df330515 LP |
732 | dma->dma = dma_request_slave_channel(dma->xdev->dev, name); |
733 | if (dma->dma == NULL) { | |
734 | dev_err(dma->xdev->dev, "no VDMA channel found\n"); | |
735 | ret = -ENODEV; | |
736 | goto error; | |
737 | } | |
738 | ||
739 | dma->align = 1 << dma->dma->device->copy_align; | |
740 | ||
741 | ret = video_register_device(&dma->video, VFL_TYPE_GRABBER, -1); | |
742 | if (ret < 0) { | |
743 | dev_err(dma->xdev->dev, "failed to register video device\n"); | |
744 | goto error; | |
745 | } | |
746 | ||
747 | return 0; | |
748 | ||
749 | error: | |
750 | xvip_dma_cleanup(dma); | |
751 | return ret; | |
752 | } | |
753 | ||
754 | void xvip_dma_cleanup(struct xvip_dma *dma) | |
755 | { | |
756 | if (video_is_registered(&dma->video)) | |
757 | video_unregister_device(&dma->video); | |
758 | ||
759 | if (dma->dma) | |
760 | dma_release_channel(dma->dma); | |
761 | ||
762 | if (!IS_ERR_OR_NULL(dma->alloc_ctx)) | |
763 | vb2_dma_contig_cleanup_ctx(dma->alloc_ctx); | |
764 | ||
765 | media_entity_cleanup(&dma->video.entity); | |
766 | ||
767 | mutex_destroy(&dma->lock); | |
768 | mutex_destroy(&dma->pipe.lock); | |
769 | } |