1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2011 Atmel Corporation
4  * Josh Wu, <josh.wu@atmel.com>
5  *
6  * Based on previous work by Lars Haring, <lars.haring@atmel.com>
7  * and Sedji Gaouaou
8  * Based on the bttv driver for Bt848 with respective copyright holders
9  */
10 
11 #include <linux/clk.h>
12 #include <linux/completion.h>
13 #include <linux/delay.h>
14 #include <linux/fs.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/of_graph.h>
20 #include <linux/platform_device.h>
21 #include <linux/pm_runtime.h>
22 #include <linux/slab.h>
23 #include <linux/of.h>
24 
25 #include <linux/videodev2.h>
26 #include <media/v4l2-ctrls.h>
27 #include <media/v4l2-device.h>
28 #include <media/v4l2-dev.h>
29 #include <media/v4l2-ioctl.h>
30 #include <media/v4l2-event.h>
31 #include <media/v4l2-fwnode.h>
32 #include <media/videobuf2-dma-contig.h>
33 #include <media/v4l2-image-sizes.h>
34 
35 #include "atmel-isi.h"
36 
37 #define MAX_SUPPORT_WIDTH		2048U
38 #define MAX_SUPPORT_HEIGHT		2048U
39 #define MIN_FRAME_RATE			15
40 #define FRAME_INTERVAL_MILLI_SEC	(1000 / MIN_FRAME_RATE)
41 
42 /* Frame buffer descriptor */
43 struct fbd {
44 	/* Physical address of the frame buffer */
45 	u32 fb_address;
46 	/* DMA Control Register(only in HISI2) */
47 	u32 dma_ctrl;
48 	/* Physical address of the next fbd */
49 	u32 next_fbd_address;
50 };
51 
52 static void set_dma_ctrl(struct fbd *fb_desc, u32 ctrl)
53 {
54 	fb_desc->dma_ctrl = ctrl;
55 }
56 
57 struct isi_dma_desc {
58 	struct list_head list;
59 	struct fbd *p_fbd;
60 	dma_addr_t fbd_phys;
61 };
62 
63 /* Frame buffer data */
64 struct frame_buffer {
65 	struct vb2_v4l2_buffer vb;
66 	struct isi_dma_desc *p_dma_desc;
67 	struct list_head list;
68 };
69 
70 struct isi_graph_entity {
71 	struct device_node *node;
72 
73 	struct v4l2_subdev *subdev;
74 };
75 
76 /*
77  * struct isi_format - ISI media bus format information
78  * @fourcc:		Fourcc code for this format
79  * @mbus_code:		V4L2 media bus format code.
80  * @bpp:		Bytes per pixel (when stored in memory)
81  * @swap:		Byte swap configuration value
82  * @support:		Indicates format supported by subdev
83  * @skip:		Skip duplicate format supported by subdev
84  */
85 struct isi_format {
86 	u32	fourcc;
87 	u32	mbus_code;
88 	u8	bpp;
89 	u32	swap;
90 };
91 
92 
93 struct atmel_isi {
94 	/* Protects the access of variables shared with the ISR */
95 	spinlock_t			irqlock;
96 	struct device			*dev;
97 	void __iomem			*regs;
98 
99 	int				sequence;
100 
101 	/* Allocate descriptors for dma buffer use */
102 	struct fbd			*p_fb_descriptors;
103 	dma_addr_t			fb_descriptors_phys;
104 	struct				list_head dma_desc_head;
105 	struct isi_dma_desc		dma_desc[VIDEO_MAX_FRAME];
106 	bool				enable_preview_path;
107 
108 	struct completion		complete;
109 	/* ISI peripheral clock */
110 	struct clk			*pclk;
111 	unsigned int			irq;
112 
113 	struct isi_platform_data	pdata;
114 	u16				width_flags;	/* max 12 bits */
115 
116 	struct list_head		video_buffer_list;
117 	struct frame_buffer		*active;
118 
119 	struct v4l2_device		v4l2_dev;
120 	struct video_device		*vdev;
121 	struct v4l2_async_notifier	notifier;
122 	struct isi_graph_entity		entity;
123 	struct v4l2_format		fmt;
124 
125 	const struct isi_format		**user_formats;
126 	unsigned int			num_user_formats;
127 	const struct isi_format		*current_fmt;
128 
129 	struct mutex			lock;
130 	struct vb2_queue		queue;
131 };
132 
133 #define notifier_to_isi(n) container_of(n, struct atmel_isi, notifier)
134 
135 static void isi_writel(struct atmel_isi *isi, u32 reg, u32 val)
136 {
137 	writel(val, isi->regs + reg);
138 }
139 static u32 isi_readl(struct atmel_isi *isi, u32 reg)
140 {
141 	return readl(isi->regs + reg);
142 }
143 
144 static void configure_geometry(struct atmel_isi *isi)
145 {
146 	u32 cfg2, psize;
147 	u32 fourcc = isi->current_fmt->fourcc;
148 
149 	isi->enable_preview_path = fourcc == V4L2_PIX_FMT_RGB565 ||
150 				   fourcc == V4L2_PIX_FMT_RGB32 ||
151 				   fourcc == V4L2_PIX_FMT_Y16;
152 
153 	/* According to sensor's output format to set cfg2 */
154 	cfg2 = isi->current_fmt->swap;
155 
156 	isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
157 	/* Set width */
158 	cfg2 |= ((isi->fmt.fmt.pix.width - 1) << ISI_CFG2_IM_HSIZE_OFFSET) &
159 			ISI_CFG2_IM_HSIZE_MASK;
160 	/* Set height */
161 	cfg2 |= ((isi->fmt.fmt.pix.height - 1) << ISI_CFG2_IM_VSIZE_OFFSET)
162 			& ISI_CFG2_IM_VSIZE_MASK;
163 	isi_writel(isi, ISI_CFG2, cfg2);
164 
165 	/* No down sampling, preview size equal to sensor output size */
166 	psize = ((isi->fmt.fmt.pix.width - 1) << ISI_PSIZE_PREV_HSIZE_OFFSET) &
167 		ISI_PSIZE_PREV_HSIZE_MASK;
168 	psize |= ((isi->fmt.fmt.pix.height - 1) << ISI_PSIZE_PREV_VSIZE_OFFSET) &
169 		ISI_PSIZE_PREV_VSIZE_MASK;
170 	isi_writel(isi, ISI_PSIZE, psize);
171 	isi_writel(isi, ISI_PDECF, ISI_PDECF_NO_SAMPLING);
172 }
173 
174 static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi)
175 {
176 	if (isi->active) {
177 		struct vb2_v4l2_buffer *vbuf = &isi->active->vb;
178 		struct frame_buffer *buf = isi->active;
179 
180 		list_del_init(&buf->list);
181 		vbuf->vb2_buf.timestamp = ktime_get_ns();
182 		vbuf->sequence = isi->sequence++;
183 		vbuf->field = V4L2_FIELD_NONE;
184 		vb2_buffer_done(&vbuf->vb2_buf, VB2_BUF_STATE_DONE);
185 	}
186 
187 	if (list_empty(&isi->video_buffer_list)) {
188 		isi->active = NULL;
189 	} else {
190 		/* start next dma frame. */
191 		isi->active = list_entry(isi->video_buffer_list.next,
192 					struct frame_buffer, list);
193 		if (!isi->enable_preview_path) {
194 			isi_writel(isi, ISI_DMA_C_DSCR,
195 				(u32)isi->active->p_dma_desc->fbd_phys);
196 			isi_writel(isi, ISI_DMA_C_CTRL,
197 				ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
198 			isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
199 		} else {
200 			isi_writel(isi, ISI_DMA_P_DSCR,
201 				(u32)isi->active->p_dma_desc->fbd_phys);
202 			isi_writel(isi, ISI_DMA_P_CTRL,
203 				ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
204 			isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_P_CH);
205 		}
206 	}
207 	return IRQ_HANDLED;
208 }
209 
210 /* ISI interrupt service routine */
211 static irqreturn_t isi_interrupt(int irq, void *dev_id)
212 {
213 	struct atmel_isi *isi = dev_id;
214 	u32 status, mask, pending;
215 	irqreturn_t ret = IRQ_NONE;
216 
217 	spin_lock(&isi->irqlock);
218 
219 	status = isi_readl(isi, ISI_STATUS);
220 	mask = isi_readl(isi, ISI_INTMASK);
221 	pending = status & mask;
222 
223 	if (pending & ISI_CTRL_SRST) {
224 		complete(&isi->complete);
225 		isi_writel(isi, ISI_INTDIS, ISI_CTRL_SRST);
226 		ret = IRQ_HANDLED;
227 	} else if (pending & ISI_CTRL_DIS) {
228 		complete(&isi->complete);
229 		isi_writel(isi, ISI_INTDIS, ISI_CTRL_DIS);
230 		ret = IRQ_HANDLED;
231 	} else {
232 		if (likely(pending & ISI_SR_CXFR_DONE) ||
233 				likely(pending & ISI_SR_PXFR_DONE))
234 			ret = atmel_isi_handle_streaming(isi);
235 	}
236 
237 	spin_unlock(&isi->irqlock);
238 	return ret;
239 }
240 
241 #define	WAIT_ISI_RESET		1
242 #define	WAIT_ISI_DISABLE	0
243 static int atmel_isi_wait_status(struct atmel_isi *isi, int wait_reset)
244 {
245 	unsigned long timeout;
246 	/*
247 	 * The reset or disable will only succeed if we have a
248 	 * pixel clock from the camera.
249 	 */
250 	init_completion(&isi->complete);
251 
252 	if (wait_reset) {
253 		isi_writel(isi, ISI_INTEN, ISI_CTRL_SRST);
254 		isi_writel(isi, ISI_CTRL, ISI_CTRL_SRST);
255 	} else {
256 		isi_writel(isi, ISI_INTEN, ISI_CTRL_DIS);
257 		isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
258 	}
259 
260 	timeout = wait_for_completion_timeout(&isi->complete,
261 			msecs_to_jiffies(500));
262 	if (timeout == 0)
263 		return -ETIMEDOUT;
264 
265 	return 0;
266 }
267 
268 /* ------------------------------------------------------------------
269 	Videobuf operations
270    ------------------------------------------------------------------*/
271 static int queue_setup(struct vb2_queue *vq,
272 				unsigned int *nbuffers, unsigned int *nplanes,
273 				unsigned int sizes[], struct device *alloc_devs[])
274 {
275 	struct atmel_isi *isi = vb2_get_drv_priv(vq);
276 	unsigned long size;
277 
278 	size = isi->fmt.fmt.pix.sizeimage;
279 
280 	/* Make sure the image size is large enough. */
281 	if (*nplanes)
282 		return sizes[0] < size ? -EINVAL : 0;
283 
284 	*nplanes = 1;
285 	sizes[0] = size;
286 
287 	isi->active = NULL;
288 
289 	dev_dbg(isi->dev, "%s, count=%d, size=%ld\n", __func__,
290 		*nbuffers, size);
291 
292 	return 0;
293 }
294 
295 static int buffer_init(struct vb2_buffer *vb)
296 {
297 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
298 	struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
299 
300 	buf->p_dma_desc = NULL;
301 	INIT_LIST_HEAD(&buf->list);
302 
303 	return 0;
304 }
305 
306 static int buffer_prepare(struct vb2_buffer *vb)
307 {
308 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
309 	struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
310 	struct atmel_isi *isi = vb2_get_drv_priv(vb->vb2_queue);
311 	unsigned long size;
312 	struct isi_dma_desc *desc;
313 
314 	size = isi->fmt.fmt.pix.sizeimage;
315 
316 	if (vb2_plane_size(vb, 0) < size) {
317 		dev_err(isi->dev, "%s data will not fit into plane (%lu < %lu)\n",
318 				__func__, vb2_plane_size(vb, 0), size);
319 		return -EINVAL;
320 	}
321 
322 	vb2_set_plane_payload(vb, 0, size);
323 
324 	if (!buf->p_dma_desc) {
325 		if (list_empty(&isi->dma_desc_head)) {
326 			dev_err(isi->dev, "Not enough dma descriptors.\n");
327 			return -EINVAL;
328 		} else {
329 			/* Get an available descriptor */
330 			desc = list_entry(isi->dma_desc_head.next,
331 						struct isi_dma_desc, list);
332 			/* Delete the descriptor since now it is used */
333 			list_del_init(&desc->list);
334 
335 			/* Initialize the dma descriptor */
336 			desc->p_fbd->fb_address =
337 					vb2_dma_contig_plane_dma_addr(vb, 0);
338 			desc->p_fbd->next_fbd_address = 0;
339 			set_dma_ctrl(desc->p_fbd, ISI_DMA_CTRL_WB);
340 
341 			buf->p_dma_desc = desc;
342 		}
343 	}
344 	return 0;
345 }
346 
347 static void buffer_cleanup(struct vb2_buffer *vb)
348 {
349 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
350 	struct atmel_isi *isi = vb2_get_drv_priv(vb->vb2_queue);
351 	struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
352 
353 	/* This descriptor is available now and we add to head list */
354 	if (buf->p_dma_desc)
355 		list_add(&buf->p_dma_desc->list, &isi->dma_desc_head);
356 }
357 
358 static void start_dma(struct atmel_isi *isi, struct frame_buffer *buffer)
359 {
360 	u32 ctrl, cfg1;
361 
362 	cfg1 = isi_readl(isi, ISI_CFG1);
363 	/* Enable irq: cxfr for the codec path, pxfr for the preview path */
364 	isi_writel(isi, ISI_INTEN,
365 			ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
366 
367 	/* Check if already in a frame */
368 	if (!isi->enable_preview_path) {
369 		if (isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) {
370 			dev_err(isi->dev, "Already in frame handling.\n");
371 			return;
372 		}
373 
374 		isi_writel(isi, ISI_DMA_C_DSCR,
375 				(u32)buffer->p_dma_desc->fbd_phys);
376 		isi_writel(isi, ISI_DMA_C_CTRL,
377 				ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
378 		isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
379 	} else {
380 		isi_writel(isi, ISI_DMA_P_DSCR,
381 				(u32)buffer->p_dma_desc->fbd_phys);
382 		isi_writel(isi, ISI_DMA_P_CTRL,
383 				ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
384 		isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_P_CH);
385 	}
386 
387 	cfg1 &= ~ISI_CFG1_FRATE_DIV_MASK;
388 	/* Enable linked list */
389 	cfg1 |= isi->pdata.frate | ISI_CFG1_DISCR;
390 
391 	/* Enable ISI */
392 	ctrl = ISI_CTRL_EN;
393 
394 	if (!isi->enable_preview_path)
395 		ctrl |= ISI_CTRL_CDC;
396 
397 	isi_writel(isi, ISI_CTRL, ctrl);
398 	isi_writel(isi, ISI_CFG1, cfg1);
399 }
400 
401 static void buffer_queue(struct vb2_buffer *vb)
402 {
403 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
404 	struct atmel_isi *isi = vb2_get_drv_priv(vb->vb2_queue);
405 	struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
406 	unsigned long flags = 0;
407 
408 	spin_lock_irqsave(&isi->irqlock, flags);
409 	list_add_tail(&buf->list, &isi->video_buffer_list);
410 
411 	if (!isi->active) {
412 		isi->active = buf;
413 		if (vb2_is_streaming(vb->vb2_queue))
414 			start_dma(isi, buf);
415 	}
416 	spin_unlock_irqrestore(&isi->irqlock, flags);
417 }
418 
419 static int start_streaming(struct vb2_queue *vq, unsigned int count)
420 {
421 	struct atmel_isi *isi = vb2_get_drv_priv(vq);
422 	struct frame_buffer *buf, *node;
423 	int ret;
424 
425 	pm_runtime_get_sync(isi->dev);
426 
427 	/* Enable stream on the sub device */
428 	ret = v4l2_subdev_call(isi->entity.subdev, video, s_stream, 1);
429 	if (ret && ret != -ENOIOCTLCMD) {
430 		dev_err(isi->dev, "stream on failed in subdev\n");
431 		goto err_start_stream;
432 	}
433 
434 	/* Reset ISI */
435 	ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET);
436 	if (ret < 0) {
437 		dev_err(isi->dev, "Reset ISI timed out\n");
438 		goto err_reset;
439 	}
440 	/* Disable all interrupts */
441 	isi_writel(isi, ISI_INTDIS, (u32)~0UL);
442 
443 	isi->sequence = 0;
444 	configure_geometry(isi);
445 
446 	spin_lock_irq(&isi->irqlock);
447 	/* Clear any pending interrupt */
448 	isi_readl(isi, ISI_STATUS);
449 
450 	start_dma(isi, isi->active);
451 	spin_unlock_irq(&isi->irqlock);
452 
453 	return 0;
454 
455 err_reset:
456 	v4l2_subdev_call(isi->entity.subdev, video, s_stream, 0);
457 
458 err_start_stream:
459 	pm_runtime_put(isi->dev);
460 
461 	spin_lock_irq(&isi->irqlock);
462 	isi->active = NULL;
463 	/* Release all active buffers */
464 	list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
465 		list_del_init(&buf->list);
466 		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
467 	}
468 	spin_unlock_irq(&isi->irqlock);
469 
470 	return ret;
471 }
472 
473 /* abort streaming and wait for last buffer */
474 static void stop_streaming(struct vb2_queue *vq)
475 {
476 	struct atmel_isi *isi = vb2_get_drv_priv(vq);
477 	struct frame_buffer *buf, *node;
478 	int ret = 0;
479 	unsigned long timeout;
480 
481 	/* Disable stream on the sub device */
482 	ret = v4l2_subdev_call(isi->entity.subdev, video, s_stream, 0);
483 	if (ret && ret != -ENOIOCTLCMD)
484 		dev_err(isi->dev, "stream off failed in subdev\n");
485 
486 	spin_lock_irq(&isi->irqlock);
487 	isi->active = NULL;
488 	/* Release all active buffers */
489 	list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
490 		list_del_init(&buf->list);
491 		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
492 	}
493 	spin_unlock_irq(&isi->irqlock);
494 
495 	if (!isi->enable_preview_path) {
496 		timeout = jiffies + (FRAME_INTERVAL_MILLI_SEC * HZ) / 1000;
497 		/* Wait until the end of the current frame. */
498 		while ((isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) &&
499 				time_before(jiffies, timeout))
500 			msleep(1);
501 
502 		if (time_after(jiffies, timeout))
503 			dev_err(isi->dev,
504 				"Timeout waiting for finishing codec request\n");
505 	}
506 
507 	/* Disable interrupts */
508 	isi_writel(isi, ISI_INTDIS,
509 			ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
510 
511 	/* Disable ISI and wait for it is done */
512 	ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE);
513 	if (ret < 0)
514 		dev_err(isi->dev, "Disable ISI timed out\n");
515 
516 	pm_runtime_put(isi->dev);
517 }
518 
519 static const struct vb2_ops isi_video_qops = {
520 	.queue_setup		= queue_setup,
521 	.buf_init		= buffer_init,
522 	.buf_prepare		= buffer_prepare,
523 	.buf_cleanup		= buffer_cleanup,
524 	.buf_queue		= buffer_queue,
525 	.start_streaming	= start_streaming,
526 	.stop_streaming		= stop_streaming,
527 	.wait_prepare		= vb2_ops_wait_prepare,
528 	.wait_finish		= vb2_ops_wait_finish,
529 };
530 
531 static int isi_g_fmt_vid_cap(struct file *file, void *priv,
532 			      struct v4l2_format *fmt)
533 {
534 	struct atmel_isi *isi = video_drvdata(file);
535 
536 	*fmt = isi->fmt;
537 
538 	return 0;
539 }
540 
541 static const struct isi_format *find_format_by_fourcc(struct atmel_isi *isi,
542 						      unsigned int fourcc)
543 {
544 	unsigned int num_formats = isi->num_user_formats;
545 	const struct isi_format *fmt;
546 	unsigned int i;
547 
548 	for (i = 0; i < num_formats; i++) {
549 		fmt = isi->user_formats[i];
550 		if (fmt->fourcc == fourcc)
551 			return fmt;
552 	}
553 
554 	return NULL;
555 }
556 
557 static void isi_try_fse(struct atmel_isi *isi, const struct isi_format *isi_fmt,
558 			struct v4l2_subdev_pad_config *pad_cfg)
559 {
560 	int ret;
561 	struct v4l2_subdev_frame_size_enum fse = {
562 		.code = isi_fmt->mbus_code,
563 		.which = V4L2_SUBDEV_FORMAT_TRY,
564 	};
565 
566 	ret = v4l2_subdev_call(isi->entity.subdev, pad, enum_frame_size,
567 			       pad_cfg, &fse);
568 	/*
569 	 * Attempt to obtain format size from subdev. If not available,
570 	 * just use the maximum ISI can receive.
571 	 */
572 	if (ret) {
573 		pad_cfg->try_crop.width = MAX_SUPPORT_WIDTH;
574 		pad_cfg->try_crop.height = MAX_SUPPORT_HEIGHT;
575 	} else {
576 		pad_cfg->try_crop.width = fse.max_width;
577 		pad_cfg->try_crop.height = fse.max_height;
578 	}
579 }
580 
581 static int isi_try_fmt(struct atmel_isi *isi, struct v4l2_format *f,
582 		       const struct isi_format **current_fmt)
583 {
584 	const struct isi_format *isi_fmt;
585 	struct v4l2_pix_format *pixfmt = &f->fmt.pix;
586 	struct v4l2_subdev_pad_config pad_cfg = {};
587 	struct v4l2_subdev_format format = {
588 		.which = V4L2_SUBDEV_FORMAT_TRY,
589 	};
590 	int ret;
591 
592 	isi_fmt = find_format_by_fourcc(isi, pixfmt->pixelformat);
593 	if (!isi_fmt) {
594 		isi_fmt = isi->user_formats[isi->num_user_formats - 1];
595 		pixfmt->pixelformat = isi_fmt->fourcc;
596 	}
597 
598 	/* Limit to Atmel ISI hardware capabilities */
599 	pixfmt->width = clamp(pixfmt->width, 0U, MAX_SUPPORT_WIDTH);
600 	pixfmt->height = clamp(pixfmt->height, 0U, MAX_SUPPORT_HEIGHT);
601 
602 	v4l2_fill_mbus_format(&format.format, pixfmt, isi_fmt->mbus_code);
603 
604 	isi_try_fse(isi, isi_fmt, &pad_cfg);
605 
606 	ret = v4l2_subdev_call(isi->entity.subdev, pad, set_fmt,
607 			       &pad_cfg, &format);
608 	if (ret < 0)
609 		return ret;
610 
611 	v4l2_fill_pix_format(pixfmt, &format.format);
612 
613 	pixfmt->field = V4L2_FIELD_NONE;
614 	pixfmt->bytesperline = pixfmt->width * isi_fmt->bpp;
615 	pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;
616 
617 	if (current_fmt)
618 		*current_fmt = isi_fmt;
619 
620 	return 0;
621 }
622 
623 static int isi_set_fmt(struct atmel_isi *isi, struct v4l2_format *f)
624 {
625 	struct v4l2_subdev_format format = {
626 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
627 	};
628 	const struct isi_format *current_fmt;
629 	int ret;
630 
631 	ret = isi_try_fmt(isi, f, &current_fmt);
632 	if (ret)
633 		return ret;
634 
635 	v4l2_fill_mbus_format(&format.format, &f->fmt.pix,
636 			      current_fmt->mbus_code);
637 	ret = v4l2_subdev_call(isi->entity.subdev, pad,
638 			       set_fmt, NULL, &format);
639 	if (ret < 0)
640 		return ret;
641 
642 	isi->fmt = *f;
643 	isi->current_fmt = current_fmt;
644 
645 	return 0;
646 }
647 
648 static int isi_s_fmt_vid_cap(struct file *file, void *priv,
649 			      struct v4l2_format *f)
650 {
651 	struct atmel_isi *isi = video_drvdata(file);
652 
653 	if (vb2_is_streaming(&isi->queue))
654 		return -EBUSY;
655 
656 	return isi_set_fmt(isi, f);
657 }
658 
659 static int isi_try_fmt_vid_cap(struct file *file, void *priv,
660 				struct v4l2_format *f)
661 {
662 	struct atmel_isi *isi = video_drvdata(file);
663 
664 	return isi_try_fmt(isi, f, NULL);
665 }
666 
667 static int isi_enum_fmt_vid_cap(struct file *file, void  *priv,
668 				struct v4l2_fmtdesc *f)
669 {
670 	struct atmel_isi *isi = video_drvdata(file);
671 
672 	if (f->index >= isi->num_user_formats)
673 		return -EINVAL;
674 
675 	f->pixelformat = isi->user_formats[f->index]->fourcc;
676 	return 0;
677 }
678 
679 static int isi_querycap(struct file *file, void *priv,
680 			struct v4l2_capability *cap)
681 {
682 	strscpy(cap->driver, "atmel-isi", sizeof(cap->driver));
683 	strscpy(cap->card, "Atmel Image Sensor Interface", sizeof(cap->card));
684 	strscpy(cap->bus_info, "platform:isi", sizeof(cap->bus_info));
685 	return 0;
686 }
687 
688 static int isi_enum_input(struct file *file, void *priv,
689 			   struct v4l2_input *i)
690 {
691 	if (i->index != 0)
692 		return -EINVAL;
693 
694 	i->type = V4L2_INPUT_TYPE_CAMERA;
695 	strscpy(i->name, "Camera", sizeof(i->name));
696 	return 0;
697 }
698 
699 static int isi_g_input(struct file *file, void *priv, unsigned int *i)
700 {
701 	*i = 0;
702 	return 0;
703 }
704 
705 static int isi_s_input(struct file *file, void *priv, unsigned int i)
706 {
707 	if (i > 0)
708 		return -EINVAL;
709 	return 0;
710 }
711 
712 static int isi_g_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
713 {
714 	struct atmel_isi *isi = video_drvdata(file);
715 
716 	return v4l2_g_parm_cap(video_devdata(file), isi->entity.subdev, a);
717 }
718 
719 static int isi_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
720 {
721 	struct atmel_isi *isi = video_drvdata(file);
722 
723 	return v4l2_s_parm_cap(video_devdata(file), isi->entity.subdev, a);
724 }
725 
726 static int isi_enum_framesizes(struct file *file, void *fh,
727 			       struct v4l2_frmsizeenum *fsize)
728 {
729 	struct atmel_isi *isi = video_drvdata(file);
730 	const struct isi_format *isi_fmt;
731 	struct v4l2_subdev_frame_size_enum fse = {
732 		.index = fsize->index,
733 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
734 	};
735 	int ret;
736 
737 	isi_fmt = find_format_by_fourcc(isi, fsize->pixel_format);
738 	if (!isi_fmt)
739 		return -EINVAL;
740 
741 	fse.code = isi_fmt->mbus_code;
742 
743 	ret = v4l2_subdev_call(isi->entity.subdev, pad, enum_frame_size,
744 			       NULL, &fse);
745 	if (ret)
746 		return ret;
747 
748 	fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
749 	fsize->discrete.width = fse.max_width;
750 	fsize->discrete.height = fse.max_height;
751 
752 	return 0;
753 }
754 
755 static int isi_enum_frameintervals(struct file *file, void *fh,
756 				    struct v4l2_frmivalenum *fival)
757 {
758 	struct atmel_isi *isi = video_drvdata(file);
759 	const struct isi_format *isi_fmt;
760 	struct v4l2_subdev_frame_interval_enum fie = {
761 		.index = fival->index,
762 		.width = fival->width,
763 		.height = fival->height,
764 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
765 	};
766 	int ret;
767 
768 	isi_fmt = find_format_by_fourcc(isi, fival->pixel_format);
769 	if (!isi_fmt)
770 		return -EINVAL;
771 
772 	fie.code = isi_fmt->mbus_code;
773 
774 	ret = v4l2_subdev_call(isi->entity.subdev, pad,
775 			       enum_frame_interval, NULL, &fie);
776 	if (ret)
777 		return ret;
778 
779 	fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
780 	fival->discrete = fie.interval;
781 
782 	return 0;
783 }
784 
785 static void isi_camera_set_bus_param(struct atmel_isi *isi)
786 {
787 	u32 cfg1 = 0;
788 
789 	/* set bus param for ISI */
790 	if (isi->pdata.hsync_act_low)
791 		cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW;
792 	if (isi->pdata.vsync_act_low)
793 		cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW;
794 	if (isi->pdata.pclk_act_falling)
795 		cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING;
796 	if (isi->pdata.has_emb_sync)
797 		cfg1 |= ISI_CFG1_EMB_SYNC;
798 	if (isi->pdata.full_mode)
799 		cfg1 |= ISI_CFG1_FULL_MODE;
800 
801 	cfg1 |= ISI_CFG1_THMASK_BEATS_16;
802 
803 	/* Enable PM and peripheral clock before operate isi registers */
804 	pm_runtime_get_sync(isi->dev);
805 
806 	isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
807 	isi_writel(isi, ISI_CFG1, cfg1);
808 
809 	pm_runtime_put(isi->dev);
810 }
811 
812 /* -----------------------------------------------------------------------*/
813 static int atmel_isi_parse_dt(struct atmel_isi *isi,
814 			struct platform_device *pdev)
815 {
816 	struct device_node *np = pdev->dev.of_node;
817 	struct v4l2_fwnode_endpoint ep = { .bus_type = 0 };
818 	int err;
819 
820 	/* Default settings for ISI */
821 	isi->pdata.full_mode = 1;
822 	isi->pdata.frate = ISI_CFG1_FRATE_CAPTURE_ALL;
823 
824 	np = of_graph_get_next_endpoint(np, NULL);
825 	if (!np) {
826 		dev_err(&pdev->dev, "Could not find the endpoint\n");
827 		return -EINVAL;
828 	}
829 
830 	err = v4l2_fwnode_endpoint_parse(of_fwnode_handle(np), &ep);
831 	of_node_put(np);
832 	if (err) {
833 		dev_err(&pdev->dev, "Could not parse the endpoint\n");
834 		return err;
835 	}
836 
837 	switch (ep.bus.parallel.bus_width) {
838 	case 8:
839 		isi->pdata.data_width_flags = ISI_DATAWIDTH_8;
840 		break;
841 	case 10:
842 		isi->pdata.data_width_flags =
843 				ISI_DATAWIDTH_8 | ISI_DATAWIDTH_10;
844 		break;
845 	default:
846 		dev_err(&pdev->dev, "Unsupported bus width: %d\n",
847 				ep.bus.parallel.bus_width);
848 		return -EINVAL;
849 	}
850 
851 	if (ep.bus.parallel.flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
852 		isi->pdata.hsync_act_low = true;
853 	if (ep.bus.parallel.flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
854 		isi->pdata.vsync_act_low = true;
855 	if (ep.bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
856 		isi->pdata.pclk_act_falling = true;
857 
858 	if (ep.bus_type == V4L2_MBUS_BT656)
859 		isi->pdata.has_emb_sync = true;
860 
861 	return 0;
862 }
863 
864 static int isi_open(struct file *file)
865 {
866 	struct atmel_isi *isi = video_drvdata(file);
867 	struct v4l2_subdev *sd = isi->entity.subdev;
868 	int ret;
869 
870 	if (mutex_lock_interruptible(&isi->lock))
871 		return -ERESTARTSYS;
872 
873 	ret = v4l2_fh_open(file);
874 	if (ret < 0)
875 		goto unlock;
876 
877 	if (!v4l2_fh_is_singular_file(file))
878 		goto fh_rel;
879 
880 	ret = v4l2_subdev_call(sd, core, s_power, 1);
881 	if (ret < 0 && ret != -ENOIOCTLCMD)
882 		goto fh_rel;
883 
884 	ret = isi_set_fmt(isi, &isi->fmt);
885 	if (ret)
886 		v4l2_subdev_call(sd, core, s_power, 0);
887 fh_rel:
888 	if (ret)
889 		v4l2_fh_release(file);
890 unlock:
891 	mutex_unlock(&isi->lock);
892 	return ret;
893 }
894 
895 static int isi_release(struct file *file)
896 {
897 	struct atmel_isi *isi = video_drvdata(file);
898 	struct v4l2_subdev *sd = isi->entity.subdev;
899 	bool fh_singular;
900 	int ret;
901 
902 	mutex_lock(&isi->lock);
903 
904 	fh_singular = v4l2_fh_is_singular_file(file);
905 
906 	ret = _vb2_fop_release(file, NULL);
907 
908 	if (fh_singular)
909 		v4l2_subdev_call(sd, core, s_power, 0);
910 
911 	mutex_unlock(&isi->lock);
912 
913 	return ret;
914 }
915 
916 static const struct v4l2_ioctl_ops isi_ioctl_ops = {
917 	.vidioc_querycap		= isi_querycap,
918 
919 	.vidioc_try_fmt_vid_cap		= isi_try_fmt_vid_cap,
920 	.vidioc_g_fmt_vid_cap		= isi_g_fmt_vid_cap,
921 	.vidioc_s_fmt_vid_cap		= isi_s_fmt_vid_cap,
922 	.vidioc_enum_fmt_vid_cap	= isi_enum_fmt_vid_cap,
923 
924 	.vidioc_enum_input		= isi_enum_input,
925 	.vidioc_g_input			= isi_g_input,
926 	.vidioc_s_input			= isi_s_input,
927 
928 	.vidioc_g_parm			= isi_g_parm,
929 	.vidioc_s_parm			= isi_s_parm,
930 	.vidioc_enum_framesizes		= isi_enum_framesizes,
931 	.vidioc_enum_frameintervals	= isi_enum_frameintervals,
932 
933 	.vidioc_reqbufs			= vb2_ioctl_reqbufs,
934 	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
935 	.vidioc_querybuf		= vb2_ioctl_querybuf,
936 	.vidioc_qbuf			= vb2_ioctl_qbuf,
937 	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
938 	.vidioc_expbuf			= vb2_ioctl_expbuf,
939 	.vidioc_prepare_buf		= vb2_ioctl_prepare_buf,
940 	.vidioc_streamon		= vb2_ioctl_streamon,
941 	.vidioc_streamoff		= vb2_ioctl_streamoff,
942 
943 	.vidioc_log_status		= v4l2_ctrl_log_status,
944 	.vidioc_subscribe_event		= v4l2_ctrl_subscribe_event,
945 	.vidioc_unsubscribe_event	= v4l2_event_unsubscribe,
946 };
947 
948 static const struct v4l2_file_operations isi_fops = {
949 	.owner		= THIS_MODULE,
950 	.unlocked_ioctl	= video_ioctl2,
951 	.open		= isi_open,
952 	.release	= isi_release,
953 	.poll		= vb2_fop_poll,
954 	.mmap		= vb2_fop_mmap,
955 	.read		= vb2_fop_read,
956 };
957 
958 static int isi_set_default_fmt(struct atmel_isi *isi)
959 {
960 	struct v4l2_format f = {
961 		.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
962 		.fmt.pix = {
963 			.width		= VGA_WIDTH,
964 			.height		= VGA_HEIGHT,
965 			.field		= V4L2_FIELD_NONE,
966 			.pixelformat	= isi->user_formats[0]->fourcc,
967 		},
968 	};
969 	int ret;
970 
971 	ret = isi_try_fmt(isi, &f, NULL);
972 	if (ret)
973 		return ret;
974 	isi->current_fmt = isi->user_formats[0];
975 	isi->fmt = f;
976 	return 0;
977 }
978 
979 static const struct isi_format isi_formats[] = {
980 	{
981 		.fourcc = V4L2_PIX_FMT_YUYV,
982 		.mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
983 		.bpp = 2,
984 		.swap = ISI_CFG2_YCC_SWAP_DEFAULT,
985 	}, {
986 		.fourcc = V4L2_PIX_FMT_YUYV,
987 		.mbus_code = MEDIA_BUS_FMT_YVYU8_2X8,
988 		.bpp = 2,
989 		.swap = ISI_CFG2_YCC_SWAP_MODE_1,
990 	}, {
991 		.fourcc = V4L2_PIX_FMT_YUYV,
992 		.mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
993 		.bpp = 2,
994 		.swap = ISI_CFG2_YCC_SWAP_MODE_2,
995 	}, {
996 		.fourcc = V4L2_PIX_FMT_YUYV,
997 		.mbus_code = MEDIA_BUS_FMT_VYUY8_2X8,
998 		.bpp = 2,
999 		.swap = ISI_CFG2_YCC_SWAP_MODE_3,
1000 	}, {
1001 		.fourcc = V4L2_PIX_FMT_RGB565,
1002 		.mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
1003 		.bpp = 2,
1004 		.swap = ISI_CFG2_YCC_SWAP_MODE_2,
1005 	}, {
1006 		.fourcc = V4L2_PIX_FMT_RGB565,
1007 		.mbus_code = MEDIA_BUS_FMT_YVYU8_2X8,
1008 		.bpp = 2,
1009 		.swap = ISI_CFG2_YCC_SWAP_MODE_3,
1010 	}, {
1011 		.fourcc = V4L2_PIX_FMT_RGB565,
1012 		.mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
1013 		.bpp = 2,
1014 		.swap = ISI_CFG2_YCC_SWAP_DEFAULT,
1015 	}, {
1016 		.fourcc = V4L2_PIX_FMT_RGB565,
1017 		.mbus_code = MEDIA_BUS_FMT_VYUY8_2X8,
1018 		.bpp = 2,
1019 		.swap = ISI_CFG2_YCC_SWAP_MODE_1,
1020 	}, {
1021 		.fourcc = V4L2_PIX_FMT_GREY,
1022 		.mbus_code = MEDIA_BUS_FMT_Y10_1X10,
1023 		.bpp = 1,
1024 		.swap = ISI_CFG2_GS_MODE_2_PIXEL | ISI_CFG2_GRAYSCALE,
1025 	}, {
1026 		.fourcc = V4L2_PIX_FMT_Y16,
1027 		.mbus_code = MEDIA_BUS_FMT_Y10_1X10,
1028 		.bpp = 2,
1029 		.swap = ISI_CFG2_GS_MODE_2_PIXEL | ISI_CFG2_GRAYSCALE,
1030 	},
1031 };
1032 
1033 static int isi_formats_init(struct atmel_isi *isi)
1034 {
1035 	const struct isi_format *isi_fmts[ARRAY_SIZE(isi_formats)];
1036 	unsigned int num_fmts = 0, i, j;
1037 	struct v4l2_subdev *subdev = isi->entity.subdev;
1038 	struct v4l2_subdev_mbus_code_enum mbus_code = {
1039 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
1040 	};
1041 
1042 	while (!v4l2_subdev_call(subdev, pad, enum_mbus_code,
1043 				 NULL, &mbus_code)) {
1044 		for (i = 0; i < ARRAY_SIZE(isi_formats); i++) {
1045 			if (isi_formats[i].mbus_code != mbus_code.code)
1046 				continue;
1047 
1048 			/* Code supported, have we got this fourcc yet? */
1049 			for (j = 0; j < num_fmts; j++)
1050 				if (isi_fmts[j]->fourcc == isi_formats[i].fourcc)
1051 					/* Already available */
1052 					break;
1053 			if (j == num_fmts)
1054 				/* new */
1055 				isi_fmts[num_fmts++] = isi_formats + i;
1056 		}
1057 		mbus_code.index++;
1058 	}
1059 
1060 	if (!num_fmts)
1061 		return -ENXIO;
1062 
1063 	isi->num_user_formats = num_fmts;
1064 	isi->user_formats = devm_kcalloc(isi->dev,
1065 					 num_fmts, sizeof(struct isi_format *),
1066 					 GFP_KERNEL);
1067 	if (!isi->user_formats)
1068 		return -ENOMEM;
1069 
1070 	memcpy(isi->user_formats, isi_fmts,
1071 	       num_fmts * sizeof(struct isi_format *));
1072 	isi->current_fmt = isi->user_formats[0];
1073 
1074 	return 0;
1075 }
1076 
1077 static int isi_graph_notify_complete(struct v4l2_async_notifier *notifier)
1078 {
1079 	struct atmel_isi *isi = notifier_to_isi(notifier);
1080 	int ret;
1081 
1082 	isi->vdev->ctrl_handler = isi->entity.subdev->ctrl_handler;
1083 	ret = isi_formats_init(isi);
1084 	if (ret) {
1085 		dev_err(isi->dev, "No supported mediabus format found\n");
1086 		return ret;
1087 	}
1088 	isi_camera_set_bus_param(isi);
1089 
1090 	ret = isi_set_default_fmt(isi);
1091 	if (ret) {
1092 		dev_err(isi->dev, "Could not set default format\n");
1093 		return ret;
1094 	}
1095 
1096 	ret = video_register_device(isi->vdev, VFL_TYPE_VIDEO, -1);
1097 	if (ret) {
1098 		dev_err(isi->dev, "Failed to register video device\n");
1099 		return ret;
1100 	}
1101 
1102 	dev_dbg(isi->dev, "Device registered as %s\n",
1103 		video_device_node_name(isi->vdev));
1104 	return 0;
1105 }
1106 
1107 static void isi_graph_notify_unbind(struct v4l2_async_notifier *notifier,
1108 				     struct v4l2_subdev *sd,
1109 				     struct v4l2_async_subdev *asd)
1110 {
1111 	struct atmel_isi *isi = notifier_to_isi(notifier);
1112 
1113 	dev_dbg(isi->dev, "Removing %s\n", video_device_node_name(isi->vdev));
1114 
1115 	/* Checks internally if vdev have been init or not */
1116 	video_unregister_device(isi->vdev);
1117 }
1118 
1119 static int isi_graph_notify_bound(struct v4l2_async_notifier *notifier,
1120 				   struct v4l2_subdev *subdev,
1121 				   struct v4l2_async_subdev *asd)
1122 {
1123 	struct atmel_isi *isi = notifier_to_isi(notifier);
1124 
1125 	dev_dbg(isi->dev, "subdev %s bound\n", subdev->name);
1126 
1127 	isi->entity.subdev = subdev;
1128 
1129 	return 0;
1130 }
1131 
1132 static const struct v4l2_async_notifier_operations isi_graph_notify_ops = {
1133 	.bound = isi_graph_notify_bound,
1134 	.unbind = isi_graph_notify_unbind,
1135 	.complete = isi_graph_notify_complete,
1136 };
1137 
1138 static int isi_graph_init(struct atmel_isi *isi)
1139 {
1140 	struct v4l2_async_subdev *asd;
1141 	struct device_node *ep;
1142 	int ret;
1143 
1144 	ep = of_graph_get_next_endpoint(isi->dev->of_node, NULL);
1145 	if (!ep)
1146 		return -EINVAL;
1147 
1148 	v4l2_async_notifier_init(&isi->notifier);
1149 
1150 	asd = v4l2_async_notifier_add_fwnode_remote_subdev(
1151 						&isi->notifier,
1152 						of_fwnode_handle(ep),
1153 						struct v4l2_async_subdev);
1154 	of_node_put(ep);
1155 
1156 	if (IS_ERR(asd))
1157 		return PTR_ERR(asd);
1158 
1159 	isi->notifier.ops = &isi_graph_notify_ops;
1160 
1161 	ret = v4l2_async_notifier_register(&isi->v4l2_dev, &isi->notifier);
1162 	if (ret < 0) {
1163 		dev_err(isi->dev, "Notifier registration failed\n");
1164 		v4l2_async_notifier_cleanup(&isi->notifier);
1165 		return ret;
1166 	}
1167 
1168 	return 0;
1169 }
1170 
1171 
1172 static int atmel_isi_probe(struct platform_device *pdev)
1173 {
1174 	int irq;
1175 	struct atmel_isi *isi;
1176 	struct vb2_queue *q;
1177 	struct resource *regs;
1178 	int ret, i;
1179 
1180 	isi = devm_kzalloc(&pdev->dev, sizeof(struct atmel_isi), GFP_KERNEL);
1181 	if (!isi)
1182 		return -ENOMEM;
1183 
1184 	isi->pclk = devm_clk_get(&pdev->dev, "isi_clk");
1185 	if (IS_ERR(isi->pclk))
1186 		return PTR_ERR(isi->pclk);
1187 
1188 	ret = atmel_isi_parse_dt(isi, pdev);
1189 	if (ret)
1190 		return ret;
1191 
1192 	isi->active = NULL;
1193 	isi->dev = &pdev->dev;
1194 	mutex_init(&isi->lock);
1195 	spin_lock_init(&isi->irqlock);
1196 	INIT_LIST_HEAD(&isi->video_buffer_list);
1197 	INIT_LIST_HEAD(&isi->dma_desc_head);
1198 
1199 	q = &isi->queue;
1200 
1201 	/* Initialize the top-level structure */
1202 	ret = v4l2_device_register(&pdev->dev, &isi->v4l2_dev);
1203 	if (ret)
1204 		return ret;
1205 
1206 	isi->vdev = video_device_alloc();
1207 	if (!isi->vdev) {
1208 		ret = -ENOMEM;
1209 		goto err_vdev_alloc;
1210 	}
1211 
1212 	/* video node */
1213 	isi->vdev->fops = &isi_fops;
1214 	isi->vdev->v4l2_dev = &isi->v4l2_dev;
1215 	isi->vdev->queue = &isi->queue;
1216 	strscpy(isi->vdev->name, KBUILD_MODNAME, sizeof(isi->vdev->name));
1217 	isi->vdev->release = video_device_release;
1218 	isi->vdev->ioctl_ops = &isi_ioctl_ops;
1219 	isi->vdev->lock = &isi->lock;
1220 	isi->vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
1221 		V4L2_CAP_READWRITE;
1222 	video_set_drvdata(isi->vdev, isi);
1223 
1224 	/* buffer queue */
1225 	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1226 	q->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
1227 	q->lock = &isi->lock;
1228 	q->drv_priv = isi;
1229 	q->buf_struct_size = sizeof(struct frame_buffer);
1230 	q->ops = &isi_video_qops;
1231 	q->mem_ops = &vb2_dma_contig_memops;
1232 	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1233 	q->min_buffers_needed = 2;
1234 	q->dev = &pdev->dev;
1235 
1236 	ret = vb2_queue_init(q);
1237 	if (ret < 0) {
1238 		dev_err(&pdev->dev, "failed to initialize VB2 queue\n");
1239 		goto err_vb2_queue;
1240 	}
1241 	isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
1242 				sizeof(struct fbd) * VIDEO_MAX_FRAME,
1243 				&isi->fb_descriptors_phys,
1244 				GFP_KERNEL);
1245 	if (!isi->p_fb_descriptors) {
1246 		dev_err(&pdev->dev, "Can't allocate descriptors!\n");
1247 		ret = -ENOMEM;
1248 		goto err_dma_alloc;
1249 	}
1250 
1251 	for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1252 		isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i;
1253 		isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys +
1254 					i * sizeof(struct fbd);
1255 		list_add(&isi->dma_desc[i].list, &isi->dma_desc_head);
1256 	}
1257 
1258 	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1259 	isi->regs = devm_ioremap_resource(&pdev->dev, regs);
1260 	if (IS_ERR(isi->regs)) {
1261 		ret = PTR_ERR(isi->regs);
1262 		goto err_ioremap;
1263 	}
1264 
1265 	if (isi->pdata.data_width_flags & ISI_DATAWIDTH_8)
1266 		isi->width_flags = 1 << 7;
1267 	if (isi->pdata.data_width_flags & ISI_DATAWIDTH_10)
1268 		isi->width_flags |= 1 << 9;
1269 
1270 	irq = platform_get_irq(pdev, 0);
1271 	if (irq < 0) {
1272 		ret = irq;
1273 		goto err_req_irq;
1274 	}
1275 
1276 	ret = devm_request_irq(&pdev->dev, irq, isi_interrupt, 0, "isi", isi);
1277 	if (ret) {
1278 		dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
1279 		goto err_req_irq;
1280 	}
1281 	isi->irq = irq;
1282 
1283 	ret = isi_graph_init(isi);
1284 	if (ret < 0)
1285 		goto err_req_irq;
1286 
1287 	pm_suspend_ignore_children(&pdev->dev, true);
1288 	pm_runtime_enable(&pdev->dev);
1289 	platform_set_drvdata(pdev, isi);
1290 	return 0;
1291 
1292 err_req_irq:
1293 err_ioremap:
1294 	dma_free_coherent(&pdev->dev,
1295 			sizeof(struct fbd) * VIDEO_MAX_FRAME,
1296 			isi->p_fb_descriptors,
1297 			isi->fb_descriptors_phys);
1298 err_dma_alloc:
1299 err_vb2_queue:
1300 	video_device_release(isi->vdev);
1301 err_vdev_alloc:
1302 	v4l2_device_unregister(&isi->v4l2_dev);
1303 
1304 	return ret;
1305 }
1306 
1307 static int atmel_isi_remove(struct platform_device *pdev)
1308 {
1309 	struct atmel_isi *isi = platform_get_drvdata(pdev);
1310 
1311 	dma_free_coherent(&pdev->dev,
1312 			sizeof(struct fbd) * VIDEO_MAX_FRAME,
1313 			isi->p_fb_descriptors,
1314 			isi->fb_descriptors_phys);
1315 	pm_runtime_disable(&pdev->dev);
1316 	v4l2_async_notifier_unregister(&isi->notifier);
1317 	v4l2_async_notifier_cleanup(&isi->notifier);
1318 	v4l2_device_unregister(&isi->v4l2_dev);
1319 
1320 	return 0;
1321 }
1322 
1323 #ifdef CONFIG_PM
1324 static int atmel_isi_runtime_suspend(struct device *dev)
1325 {
1326 	struct atmel_isi *isi = dev_get_drvdata(dev);
1327 
1328 	clk_disable_unprepare(isi->pclk);
1329 
1330 	return 0;
1331 }
1332 static int atmel_isi_runtime_resume(struct device *dev)
1333 {
1334 	struct atmel_isi *isi = dev_get_drvdata(dev);
1335 
1336 	return clk_prepare_enable(isi->pclk);
1337 }
1338 #endif /* CONFIG_PM */
1339 
1340 static const struct dev_pm_ops atmel_isi_dev_pm_ops = {
1341 	SET_RUNTIME_PM_OPS(atmel_isi_runtime_suspend,
1342 				atmel_isi_runtime_resume, NULL)
1343 };
1344 
1345 static const struct of_device_id atmel_isi_of_match[] = {
1346 	{ .compatible = "atmel,at91sam9g45-isi" },
1347 	{ }
1348 };
1349 MODULE_DEVICE_TABLE(of, atmel_isi_of_match);
1350 
1351 static struct platform_driver atmel_isi_driver = {
1352 	.driver		= {
1353 		.name = "atmel_isi",
1354 		.of_match_table = of_match_ptr(atmel_isi_of_match),
1355 		.pm	= &atmel_isi_dev_pm_ops,
1356 	},
1357 	.probe		= atmel_isi_probe,
1358 	.remove		= atmel_isi_remove,
1359 };
1360 
1361 module_platform_driver(atmel_isi_driver);
1362 
1363 MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>");
1364 MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux");
1365 MODULE_LICENSE("GPL");
1366