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_async_subdev asd;
74 	struct v4l2_subdev *subdev;
75 };
76 
77 /*
78  * struct isi_format - ISI media bus format information
79  * @fourcc:		Fourcc code for this format
80  * @mbus_code:		V4L2 media bus format code.
81  * @bpp:		Bytes per pixel (when stored in memory)
82  * @swap:		Byte swap configuration value
83  * @support:		Indicates format supported by subdev
84  * @skip:		Skip duplicate format supported by subdev
85  */
86 struct isi_format {
87 	u32	fourcc;
88 	u32	mbus_code;
89 	u8	bpp;
90 	u32	swap;
91 };
92 
93 
94 struct atmel_isi {
95 	/* Protects the access of variables shared with the ISR */
96 	spinlock_t			irqlock;
97 	struct device			*dev;
98 	void __iomem			*regs;
99 
100 	int				sequence;
101 
102 	/* Allocate descriptors for dma buffer use */
103 	struct fbd			*p_fb_descriptors;
104 	dma_addr_t			fb_descriptors_phys;
105 	struct				list_head dma_desc_head;
106 	struct isi_dma_desc		dma_desc[VIDEO_MAX_FRAME];
107 	bool				enable_preview_path;
108 
109 	struct completion		complete;
110 	/* ISI peripheral clock */
111 	struct clk			*pclk;
112 	unsigned int			irq;
113 
114 	struct isi_platform_data	pdata;
115 	u16				width_flags;	/* max 12 bits */
116 
117 	struct list_head		video_buffer_list;
118 	struct frame_buffer		*active;
119 
120 	struct v4l2_device		v4l2_dev;
121 	struct video_device		*vdev;
122 	struct v4l2_async_notifier	notifier;
123 	struct isi_graph_entity		entity;
124 	struct v4l2_format		fmt;
125 
126 	const struct isi_format		**user_formats;
127 	unsigned int			num_user_formats;
128 	const struct isi_format		*current_fmt;
129 
130 	struct mutex			lock;
131 	struct vb2_queue		queue;
132 };
133 
134 #define notifier_to_isi(n) container_of(n, struct atmel_isi, notifier)
135 
136 static void isi_writel(struct atmel_isi *isi, u32 reg, u32 val)
137 {
138 	writel(val, isi->regs + reg);
139 }
140 static u32 isi_readl(struct atmel_isi *isi, u32 reg)
141 {
142 	return readl(isi->regs + reg);
143 }
144 
145 static void configure_geometry(struct atmel_isi *isi)
146 {
147 	u32 cfg2, psize;
148 	u32 fourcc = isi->current_fmt->fourcc;
149 
150 	isi->enable_preview_path = fourcc == V4L2_PIX_FMT_RGB565 ||
151 				   fourcc == V4L2_PIX_FMT_RGB32;
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 int isi_try_fmt(struct atmel_isi *isi, struct v4l2_format *f,
558 		       const struct isi_format **current_fmt)
559 {
560 	const struct isi_format *isi_fmt;
561 	struct v4l2_pix_format *pixfmt = &f->fmt.pix;
562 	struct v4l2_subdev_pad_config pad_cfg;
563 	struct v4l2_subdev_format format = {
564 		.which = V4L2_SUBDEV_FORMAT_TRY,
565 	};
566 	int ret;
567 
568 	isi_fmt = find_format_by_fourcc(isi, pixfmt->pixelformat);
569 	if (!isi_fmt) {
570 		isi_fmt = isi->user_formats[isi->num_user_formats - 1];
571 		pixfmt->pixelformat = isi_fmt->fourcc;
572 	}
573 
574 	/* Limit to Atmel ISI hardware capabilities */
575 	pixfmt->width = clamp(pixfmt->width, 0U, MAX_SUPPORT_WIDTH);
576 	pixfmt->height = clamp(pixfmt->height, 0U, MAX_SUPPORT_HEIGHT);
577 
578 	v4l2_fill_mbus_format(&format.format, pixfmt, isi_fmt->mbus_code);
579 	ret = v4l2_subdev_call(isi->entity.subdev, pad, set_fmt,
580 			       &pad_cfg, &format);
581 	if (ret < 0)
582 		return ret;
583 
584 	v4l2_fill_pix_format(pixfmt, &format.format);
585 
586 	pixfmt->field = V4L2_FIELD_NONE;
587 	pixfmt->bytesperline = pixfmt->width * isi_fmt->bpp;
588 	pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;
589 
590 	if (current_fmt)
591 		*current_fmt = isi_fmt;
592 
593 	return 0;
594 }
595 
596 static int isi_set_fmt(struct atmel_isi *isi, struct v4l2_format *f)
597 {
598 	struct v4l2_subdev_format format = {
599 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
600 	};
601 	const struct isi_format *current_fmt;
602 	int ret;
603 
604 	ret = isi_try_fmt(isi, f, &current_fmt);
605 	if (ret)
606 		return ret;
607 
608 	v4l2_fill_mbus_format(&format.format, &f->fmt.pix,
609 			      current_fmt->mbus_code);
610 	ret = v4l2_subdev_call(isi->entity.subdev, pad,
611 			       set_fmt, NULL, &format);
612 	if (ret < 0)
613 		return ret;
614 
615 	isi->fmt = *f;
616 	isi->current_fmt = current_fmt;
617 
618 	return 0;
619 }
620 
621 static int isi_s_fmt_vid_cap(struct file *file, void *priv,
622 			      struct v4l2_format *f)
623 {
624 	struct atmel_isi *isi = video_drvdata(file);
625 
626 	if (vb2_is_streaming(&isi->queue))
627 		return -EBUSY;
628 
629 	return isi_set_fmt(isi, f);
630 }
631 
632 static int isi_try_fmt_vid_cap(struct file *file, void *priv,
633 				struct v4l2_format *f)
634 {
635 	struct atmel_isi *isi = video_drvdata(file);
636 
637 	return isi_try_fmt(isi, f, NULL);
638 }
639 
640 static int isi_enum_fmt_vid_cap(struct file *file, void  *priv,
641 				struct v4l2_fmtdesc *f)
642 {
643 	struct atmel_isi *isi = video_drvdata(file);
644 
645 	if (f->index >= isi->num_user_formats)
646 		return -EINVAL;
647 
648 	f->pixelformat = isi->user_formats[f->index]->fourcc;
649 	return 0;
650 }
651 
652 static int isi_querycap(struct file *file, void *priv,
653 			struct v4l2_capability *cap)
654 {
655 	strscpy(cap->driver, "atmel-isi", sizeof(cap->driver));
656 	strscpy(cap->card, "Atmel Image Sensor Interface", sizeof(cap->card));
657 	strscpy(cap->bus_info, "platform:isi", sizeof(cap->bus_info));
658 	return 0;
659 }
660 
661 static int isi_enum_input(struct file *file, void *priv,
662 			   struct v4l2_input *i)
663 {
664 	if (i->index != 0)
665 		return -EINVAL;
666 
667 	i->type = V4L2_INPUT_TYPE_CAMERA;
668 	strscpy(i->name, "Camera", sizeof(i->name));
669 	return 0;
670 }
671 
672 static int isi_g_input(struct file *file, void *priv, unsigned int *i)
673 {
674 	*i = 0;
675 	return 0;
676 }
677 
678 static int isi_s_input(struct file *file, void *priv, unsigned int i)
679 {
680 	if (i > 0)
681 		return -EINVAL;
682 	return 0;
683 }
684 
685 static int isi_g_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
686 {
687 	struct atmel_isi *isi = video_drvdata(file);
688 
689 	return v4l2_g_parm_cap(video_devdata(file), isi->entity.subdev, a);
690 }
691 
692 static int isi_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
693 {
694 	struct atmel_isi *isi = video_drvdata(file);
695 
696 	return v4l2_s_parm_cap(video_devdata(file), isi->entity.subdev, a);
697 }
698 
699 static int isi_enum_framesizes(struct file *file, void *fh,
700 			       struct v4l2_frmsizeenum *fsize)
701 {
702 	struct atmel_isi *isi = video_drvdata(file);
703 	const struct isi_format *isi_fmt;
704 	struct v4l2_subdev_frame_size_enum fse = {
705 		.index = fsize->index,
706 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
707 	};
708 	int ret;
709 
710 	isi_fmt = find_format_by_fourcc(isi, fsize->pixel_format);
711 	if (!isi_fmt)
712 		return -EINVAL;
713 
714 	fse.code = isi_fmt->mbus_code;
715 
716 	ret = v4l2_subdev_call(isi->entity.subdev, pad, enum_frame_size,
717 			       NULL, &fse);
718 	if (ret)
719 		return ret;
720 
721 	fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
722 	fsize->discrete.width = fse.max_width;
723 	fsize->discrete.height = fse.max_height;
724 
725 	return 0;
726 }
727 
728 static int isi_enum_frameintervals(struct file *file, void *fh,
729 				    struct v4l2_frmivalenum *fival)
730 {
731 	struct atmel_isi *isi = video_drvdata(file);
732 	const struct isi_format *isi_fmt;
733 	struct v4l2_subdev_frame_interval_enum fie = {
734 		.index = fival->index,
735 		.width = fival->width,
736 		.height = fival->height,
737 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
738 	};
739 	int ret;
740 
741 	isi_fmt = find_format_by_fourcc(isi, fival->pixel_format);
742 	if (!isi_fmt)
743 		return -EINVAL;
744 
745 	fie.code = isi_fmt->mbus_code;
746 
747 	ret = v4l2_subdev_call(isi->entity.subdev, pad,
748 			       enum_frame_interval, NULL, &fie);
749 	if (ret)
750 		return ret;
751 
752 	fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
753 	fival->discrete = fie.interval;
754 
755 	return 0;
756 }
757 
758 static void isi_camera_set_bus_param(struct atmel_isi *isi)
759 {
760 	u32 cfg1 = 0;
761 
762 	/* set bus param for ISI */
763 	if (isi->pdata.hsync_act_low)
764 		cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW;
765 	if (isi->pdata.vsync_act_low)
766 		cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW;
767 	if (isi->pdata.pclk_act_falling)
768 		cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING;
769 	if (isi->pdata.has_emb_sync)
770 		cfg1 |= ISI_CFG1_EMB_SYNC;
771 	if (isi->pdata.full_mode)
772 		cfg1 |= ISI_CFG1_FULL_MODE;
773 
774 	cfg1 |= ISI_CFG1_THMASK_BEATS_16;
775 
776 	/* Enable PM and peripheral clock before operate isi registers */
777 	pm_runtime_get_sync(isi->dev);
778 
779 	isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
780 	isi_writel(isi, ISI_CFG1, cfg1);
781 
782 	pm_runtime_put(isi->dev);
783 }
784 
785 /* -----------------------------------------------------------------------*/
786 static int atmel_isi_parse_dt(struct atmel_isi *isi,
787 			struct platform_device *pdev)
788 {
789 	struct device_node *np = pdev->dev.of_node;
790 	struct v4l2_fwnode_endpoint ep = { .bus_type = 0 };
791 	int err;
792 
793 	/* Default settings for ISI */
794 	isi->pdata.full_mode = 1;
795 	isi->pdata.frate = ISI_CFG1_FRATE_CAPTURE_ALL;
796 
797 	np = of_graph_get_next_endpoint(np, NULL);
798 	if (!np) {
799 		dev_err(&pdev->dev, "Could not find the endpoint\n");
800 		return -EINVAL;
801 	}
802 
803 	err = v4l2_fwnode_endpoint_parse(of_fwnode_handle(np), &ep);
804 	of_node_put(np);
805 	if (err) {
806 		dev_err(&pdev->dev, "Could not parse the endpoint\n");
807 		return err;
808 	}
809 
810 	switch (ep.bus.parallel.bus_width) {
811 	case 8:
812 		isi->pdata.data_width_flags = ISI_DATAWIDTH_8;
813 		break;
814 	case 10:
815 		isi->pdata.data_width_flags =
816 				ISI_DATAWIDTH_8 | ISI_DATAWIDTH_10;
817 		break;
818 	default:
819 		dev_err(&pdev->dev, "Unsupported bus width: %d\n",
820 				ep.bus.parallel.bus_width);
821 		return -EINVAL;
822 	}
823 
824 	if (ep.bus.parallel.flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
825 		isi->pdata.hsync_act_low = true;
826 	if (ep.bus.parallel.flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
827 		isi->pdata.vsync_act_low = true;
828 	if (ep.bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
829 		isi->pdata.pclk_act_falling = true;
830 
831 	if (ep.bus_type == V4L2_MBUS_BT656)
832 		isi->pdata.has_emb_sync = true;
833 
834 	return 0;
835 }
836 
837 static int isi_open(struct file *file)
838 {
839 	struct atmel_isi *isi = video_drvdata(file);
840 	struct v4l2_subdev *sd = isi->entity.subdev;
841 	int ret;
842 
843 	if (mutex_lock_interruptible(&isi->lock))
844 		return -ERESTARTSYS;
845 
846 	ret = v4l2_fh_open(file);
847 	if (ret < 0)
848 		goto unlock;
849 
850 	if (!v4l2_fh_is_singular_file(file))
851 		goto fh_rel;
852 
853 	ret = v4l2_subdev_call(sd, core, s_power, 1);
854 	if (ret < 0 && ret != -ENOIOCTLCMD)
855 		goto fh_rel;
856 
857 	ret = isi_set_fmt(isi, &isi->fmt);
858 	if (ret)
859 		v4l2_subdev_call(sd, core, s_power, 0);
860 fh_rel:
861 	if (ret)
862 		v4l2_fh_release(file);
863 unlock:
864 	mutex_unlock(&isi->lock);
865 	return ret;
866 }
867 
868 static int isi_release(struct file *file)
869 {
870 	struct atmel_isi *isi = video_drvdata(file);
871 	struct v4l2_subdev *sd = isi->entity.subdev;
872 	bool fh_singular;
873 	int ret;
874 
875 	mutex_lock(&isi->lock);
876 
877 	fh_singular = v4l2_fh_is_singular_file(file);
878 
879 	ret = _vb2_fop_release(file, NULL);
880 
881 	if (fh_singular)
882 		v4l2_subdev_call(sd, core, s_power, 0);
883 
884 	mutex_unlock(&isi->lock);
885 
886 	return ret;
887 }
888 
889 static const struct v4l2_ioctl_ops isi_ioctl_ops = {
890 	.vidioc_querycap		= isi_querycap,
891 
892 	.vidioc_try_fmt_vid_cap		= isi_try_fmt_vid_cap,
893 	.vidioc_g_fmt_vid_cap		= isi_g_fmt_vid_cap,
894 	.vidioc_s_fmt_vid_cap		= isi_s_fmt_vid_cap,
895 	.vidioc_enum_fmt_vid_cap	= isi_enum_fmt_vid_cap,
896 
897 	.vidioc_enum_input		= isi_enum_input,
898 	.vidioc_g_input			= isi_g_input,
899 	.vidioc_s_input			= isi_s_input,
900 
901 	.vidioc_g_parm			= isi_g_parm,
902 	.vidioc_s_parm			= isi_s_parm,
903 	.vidioc_enum_framesizes		= isi_enum_framesizes,
904 	.vidioc_enum_frameintervals	= isi_enum_frameintervals,
905 
906 	.vidioc_reqbufs			= vb2_ioctl_reqbufs,
907 	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
908 	.vidioc_querybuf		= vb2_ioctl_querybuf,
909 	.vidioc_qbuf			= vb2_ioctl_qbuf,
910 	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
911 	.vidioc_expbuf			= vb2_ioctl_expbuf,
912 	.vidioc_prepare_buf		= vb2_ioctl_prepare_buf,
913 	.vidioc_streamon		= vb2_ioctl_streamon,
914 	.vidioc_streamoff		= vb2_ioctl_streamoff,
915 
916 	.vidioc_log_status		= v4l2_ctrl_log_status,
917 	.vidioc_subscribe_event		= v4l2_ctrl_subscribe_event,
918 	.vidioc_unsubscribe_event	= v4l2_event_unsubscribe,
919 };
920 
921 static const struct v4l2_file_operations isi_fops = {
922 	.owner		= THIS_MODULE,
923 	.unlocked_ioctl	= video_ioctl2,
924 	.open		= isi_open,
925 	.release	= isi_release,
926 	.poll		= vb2_fop_poll,
927 	.mmap		= vb2_fop_mmap,
928 	.read		= vb2_fop_read,
929 };
930 
931 static int isi_set_default_fmt(struct atmel_isi *isi)
932 {
933 	struct v4l2_format f = {
934 		.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
935 		.fmt.pix = {
936 			.width		= VGA_WIDTH,
937 			.height		= VGA_HEIGHT,
938 			.field		= V4L2_FIELD_NONE,
939 			.pixelformat	= isi->user_formats[0]->fourcc,
940 		},
941 	};
942 	int ret;
943 
944 	ret = isi_try_fmt(isi, &f, NULL);
945 	if (ret)
946 		return ret;
947 	isi->current_fmt = isi->user_formats[0];
948 	isi->fmt = f;
949 	return 0;
950 }
951 
952 static const struct isi_format isi_formats[] = {
953 	{
954 		.fourcc = V4L2_PIX_FMT_YUYV,
955 		.mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
956 		.bpp = 2,
957 		.swap = ISI_CFG2_YCC_SWAP_DEFAULT,
958 	}, {
959 		.fourcc = V4L2_PIX_FMT_YUYV,
960 		.mbus_code = MEDIA_BUS_FMT_YVYU8_2X8,
961 		.bpp = 2,
962 		.swap = ISI_CFG2_YCC_SWAP_MODE_1,
963 	}, {
964 		.fourcc = V4L2_PIX_FMT_YUYV,
965 		.mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
966 		.bpp = 2,
967 		.swap = ISI_CFG2_YCC_SWAP_MODE_2,
968 	}, {
969 		.fourcc = V4L2_PIX_FMT_YUYV,
970 		.mbus_code = MEDIA_BUS_FMT_VYUY8_2X8,
971 		.bpp = 2,
972 		.swap = ISI_CFG2_YCC_SWAP_MODE_3,
973 	}, {
974 		.fourcc = V4L2_PIX_FMT_RGB565,
975 		.mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
976 		.bpp = 2,
977 		.swap = ISI_CFG2_YCC_SWAP_MODE_2,
978 	}, {
979 		.fourcc = V4L2_PIX_FMT_RGB565,
980 		.mbus_code = MEDIA_BUS_FMT_YVYU8_2X8,
981 		.bpp = 2,
982 		.swap = ISI_CFG2_YCC_SWAP_MODE_3,
983 	}, {
984 		.fourcc = V4L2_PIX_FMT_RGB565,
985 		.mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
986 		.bpp = 2,
987 		.swap = ISI_CFG2_YCC_SWAP_DEFAULT,
988 	}, {
989 		.fourcc = V4L2_PIX_FMT_RGB565,
990 		.mbus_code = MEDIA_BUS_FMT_VYUY8_2X8,
991 		.bpp = 2,
992 		.swap = ISI_CFG2_YCC_SWAP_MODE_1,
993 	},
994 };
995 
996 static int isi_formats_init(struct atmel_isi *isi)
997 {
998 	const struct isi_format *isi_fmts[ARRAY_SIZE(isi_formats)];
999 	unsigned int num_fmts = 0, i, j;
1000 	struct v4l2_subdev *subdev = isi->entity.subdev;
1001 	struct v4l2_subdev_mbus_code_enum mbus_code = {
1002 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
1003 	};
1004 
1005 	while (!v4l2_subdev_call(subdev, pad, enum_mbus_code,
1006 				 NULL, &mbus_code)) {
1007 		for (i = 0; i < ARRAY_SIZE(isi_formats); i++) {
1008 			if (isi_formats[i].mbus_code != mbus_code.code)
1009 				continue;
1010 
1011 			/* Code supported, have we got this fourcc yet? */
1012 			for (j = 0; j < num_fmts; j++)
1013 				if (isi_fmts[j]->fourcc == isi_formats[i].fourcc)
1014 					/* Already available */
1015 					break;
1016 			if (j == num_fmts)
1017 				/* new */
1018 				isi_fmts[num_fmts++] = isi_formats + i;
1019 		}
1020 		mbus_code.index++;
1021 	}
1022 
1023 	if (!num_fmts)
1024 		return -ENXIO;
1025 
1026 	isi->num_user_formats = num_fmts;
1027 	isi->user_formats = devm_kcalloc(isi->dev,
1028 					 num_fmts, sizeof(struct isi_format *),
1029 					 GFP_KERNEL);
1030 	if (!isi->user_formats)
1031 		return -ENOMEM;
1032 
1033 	memcpy(isi->user_formats, isi_fmts,
1034 	       num_fmts * sizeof(struct isi_format *));
1035 	isi->current_fmt = isi->user_formats[0];
1036 
1037 	return 0;
1038 }
1039 
1040 static int isi_graph_notify_complete(struct v4l2_async_notifier *notifier)
1041 {
1042 	struct atmel_isi *isi = notifier_to_isi(notifier);
1043 	int ret;
1044 
1045 	isi->vdev->ctrl_handler = isi->entity.subdev->ctrl_handler;
1046 	ret = isi_formats_init(isi);
1047 	if (ret) {
1048 		dev_err(isi->dev, "No supported mediabus format found\n");
1049 		return ret;
1050 	}
1051 	isi_camera_set_bus_param(isi);
1052 
1053 	ret = isi_set_default_fmt(isi);
1054 	if (ret) {
1055 		dev_err(isi->dev, "Could not set default format\n");
1056 		return ret;
1057 	}
1058 
1059 	ret = video_register_device(isi->vdev, VFL_TYPE_GRABBER, -1);
1060 	if (ret) {
1061 		dev_err(isi->dev, "Failed to register video device\n");
1062 		return ret;
1063 	}
1064 
1065 	dev_dbg(isi->dev, "Device registered as %s\n",
1066 		video_device_node_name(isi->vdev));
1067 	return 0;
1068 }
1069 
1070 static void isi_graph_notify_unbind(struct v4l2_async_notifier *notifier,
1071 				     struct v4l2_subdev *sd,
1072 				     struct v4l2_async_subdev *asd)
1073 {
1074 	struct atmel_isi *isi = notifier_to_isi(notifier);
1075 
1076 	dev_dbg(isi->dev, "Removing %s\n", video_device_node_name(isi->vdev));
1077 
1078 	/* Checks internally if vdev have been init or not */
1079 	video_unregister_device(isi->vdev);
1080 }
1081 
1082 static int isi_graph_notify_bound(struct v4l2_async_notifier *notifier,
1083 				   struct v4l2_subdev *subdev,
1084 				   struct v4l2_async_subdev *asd)
1085 {
1086 	struct atmel_isi *isi = notifier_to_isi(notifier);
1087 
1088 	dev_dbg(isi->dev, "subdev %s bound\n", subdev->name);
1089 
1090 	isi->entity.subdev = subdev;
1091 
1092 	return 0;
1093 }
1094 
1095 static const struct v4l2_async_notifier_operations isi_graph_notify_ops = {
1096 	.bound = isi_graph_notify_bound,
1097 	.unbind = isi_graph_notify_unbind,
1098 	.complete = isi_graph_notify_complete,
1099 };
1100 
1101 static int isi_graph_parse(struct atmel_isi *isi, struct device_node *node)
1102 {
1103 	struct device_node *ep = NULL;
1104 	struct device_node *remote;
1105 
1106 	ep = of_graph_get_next_endpoint(node, ep);
1107 	if (!ep)
1108 		return -EINVAL;
1109 
1110 	remote = of_graph_get_remote_port_parent(ep);
1111 	of_node_put(ep);
1112 	if (!remote)
1113 		return -EINVAL;
1114 
1115 	/* Remote node to connect */
1116 	isi->entity.node = remote;
1117 	isi->entity.asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
1118 	isi->entity.asd.match.fwnode = of_fwnode_handle(remote);
1119 	return 0;
1120 }
1121 
1122 static int isi_graph_init(struct atmel_isi *isi)
1123 {
1124 	int ret;
1125 
1126 	/* Parse the graph to extract a list of subdevice DT nodes. */
1127 	ret = isi_graph_parse(isi, isi->dev->of_node);
1128 	if (ret < 0) {
1129 		dev_err(isi->dev, "Graph parsing failed\n");
1130 		return ret;
1131 	}
1132 
1133 	v4l2_async_notifier_init(&isi->notifier);
1134 
1135 	ret = v4l2_async_notifier_add_subdev(&isi->notifier, &isi->entity.asd);
1136 	if (ret) {
1137 		of_node_put(isi->entity.node);
1138 		return ret;
1139 	}
1140 
1141 	isi->notifier.ops = &isi_graph_notify_ops;
1142 
1143 	ret = v4l2_async_notifier_register(&isi->v4l2_dev, &isi->notifier);
1144 	if (ret < 0) {
1145 		dev_err(isi->dev, "Notifier registration failed\n");
1146 		v4l2_async_notifier_cleanup(&isi->notifier);
1147 		return ret;
1148 	}
1149 
1150 	return 0;
1151 }
1152 
1153 
1154 static int atmel_isi_probe(struct platform_device *pdev)
1155 {
1156 	int irq;
1157 	struct atmel_isi *isi;
1158 	struct vb2_queue *q;
1159 	struct resource *regs;
1160 	int ret, i;
1161 
1162 	isi = devm_kzalloc(&pdev->dev, sizeof(struct atmel_isi), GFP_KERNEL);
1163 	if (!isi)
1164 		return -ENOMEM;
1165 
1166 	isi->pclk = devm_clk_get(&pdev->dev, "isi_clk");
1167 	if (IS_ERR(isi->pclk))
1168 		return PTR_ERR(isi->pclk);
1169 
1170 	ret = atmel_isi_parse_dt(isi, pdev);
1171 	if (ret)
1172 		return ret;
1173 
1174 	isi->active = NULL;
1175 	isi->dev = &pdev->dev;
1176 	mutex_init(&isi->lock);
1177 	spin_lock_init(&isi->irqlock);
1178 	INIT_LIST_HEAD(&isi->video_buffer_list);
1179 	INIT_LIST_HEAD(&isi->dma_desc_head);
1180 
1181 	q = &isi->queue;
1182 
1183 	/* Initialize the top-level structure */
1184 	ret = v4l2_device_register(&pdev->dev, &isi->v4l2_dev);
1185 	if (ret)
1186 		return ret;
1187 
1188 	isi->vdev = video_device_alloc();
1189 	if (!isi->vdev) {
1190 		ret = -ENOMEM;
1191 		goto err_vdev_alloc;
1192 	}
1193 
1194 	/* video node */
1195 	isi->vdev->fops = &isi_fops;
1196 	isi->vdev->v4l2_dev = &isi->v4l2_dev;
1197 	isi->vdev->queue = &isi->queue;
1198 	strscpy(isi->vdev->name, KBUILD_MODNAME, sizeof(isi->vdev->name));
1199 	isi->vdev->release = video_device_release;
1200 	isi->vdev->ioctl_ops = &isi_ioctl_ops;
1201 	isi->vdev->lock = &isi->lock;
1202 	isi->vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
1203 		V4L2_CAP_READWRITE;
1204 	video_set_drvdata(isi->vdev, isi);
1205 
1206 	/* buffer queue */
1207 	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1208 	q->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
1209 	q->lock = &isi->lock;
1210 	q->drv_priv = isi;
1211 	q->buf_struct_size = sizeof(struct frame_buffer);
1212 	q->ops = &isi_video_qops;
1213 	q->mem_ops = &vb2_dma_contig_memops;
1214 	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1215 	q->min_buffers_needed = 2;
1216 	q->dev = &pdev->dev;
1217 
1218 	ret = vb2_queue_init(q);
1219 	if (ret < 0) {
1220 		dev_err(&pdev->dev, "failed to initialize VB2 queue\n");
1221 		goto err_vb2_queue;
1222 	}
1223 	isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
1224 				sizeof(struct fbd) * VIDEO_MAX_FRAME,
1225 				&isi->fb_descriptors_phys,
1226 				GFP_KERNEL);
1227 	if (!isi->p_fb_descriptors) {
1228 		dev_err(&pdev->dev, "Can't allocate descriptors!\n");
1229 		ret = -ENOMEM;
1230 		goto err_dma_alloc;
1231 	}
1232 
1233 	for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1234 		isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i;
1235 		isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys +
1236 					i * sizeof(struct fbd);
1237 		list_add(&isi->dma_desc[i].list, &isi->dma_desc_head);
1238 	}
1239 
1240 	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1241 	isi->regs = devm_ioremap_resource(&pdev->dev, regs);
1242 	if (IS_ERR(isi->regs)) {
1243 		ret = PTR_ERR(isi->regs);
1244 		goto err_ioremap;
1245 	}
1246 
1247 	if (isi->pdata.data_width_flags & ISI_DATAWIDTH_8)
1248 		isi->width_flags = 1 << 7;
1249 	if (isi->pdata.data_width_flags & ISI_DATAWIDTH_10)
1250 		isi->width_flags |= 1 << 9;
1251 
1252 	irq = platform_get_irq(pdev, 0);
1253 	if (irq < 0) {
1254 		ret = irq;
1255 		goto err_req_irq;
1256 	}
1257 
1258 	ret = devm_request_irq(&pdev->dev, irq, isi_interrupt, 0, "isi", isi);
1259 	if (ret) {
1260 		dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
1261 		goto err_req_irq;
1262 	}
1263 	isi->irq = irq;
1264 
1265 	ret = isi_graph_init(isi);
1266 	if (ret < 0)
1267 		goto err_req_irq;
1268 
1269 	pm_suspend_ignore_children(&pdev->dev, true);
1270 	pm_runtime_enable(&pdev->dev);
1271 	platform_set_drvdata(pdev, isi);
1272 	return 0;
1273 
1274 err_req_irq:
1275 err_ioremap:
1276 	dma_free_coherent(&pdev->dev,
1277 			sizeof(struct fbd) * VIDEO_MAX_FRAME,
1278 			isi->p_fb_descriptors,
1279 			isi->fb_descriptors_phys);
1280 err_dma_alloc:
1281 err_vb2_queue:
1282 	video_device_release(isi->vdev);
1283 err_vdev_alloc:
1284 	v4l2_device_unregister(&isi->v4l2_dev);
1285 
1286 	return ret;
1287 }
1288 
1289 static int atmel_isi_remove(struct platform_device *pdev)
1290 {
1291 	struct atmel_isi *isi = platform_get_drvdata(pdev);
1292 
1293 	dma_free_coherent(&pdev->dev,
1294 			sizeof(struct fbd) * VIDEO_MAX_FRAME,
1295 			isi->p_fb_descriptors,
1296 			isi->fb_descriptors_phys);
1297 	pm_runtime_disable(&pdev->dev);
1298 	v4l2_async_notifier_unregister(&isi->notifier);
1299 	v4l2_async_notifier_cleanup(&isi->notifier);
1300 	v4l2_device_unregister(&isi->v4l2_dev);
1301 
1302 	return 0;
1303 }
1304 
1305 #ifdef CONFIG_PM
1306 static int atmel_isi_runtime_suspend(struct device *dev)
1307 {
1308 	struct atmel_isi *isi = dev_get_drvdata(dev);
1309 
1310 	clk_disable_unprepare(isi->pclk);
1311 
1312 	return 0;
1313 }
1314 static int atmel_isi_runtime_resume(struct device *dev)
1315 {
1316 	struct atmel_isi *isi = dev_get_drvdata(dev);
1317 
1318 	return clk_prepare_enable(isi->pclk);
1319 }
1320 #endif /* CONFIG_PM */
1321 
1322 static const struct dev_pm_ops atmel_isi_dev_pm_ops = {
1323 	SET_RUNTIME_PM_OPS(atmel_isi_runtime_suspend,
1324 				atmel_isi_runtime_resume, NULL)
1325 };
1326 
1327 static const struct of_device_id atmel_isi_of_match[] = {
1328 	{ .compatible = "atmel,at91sam9g45-isi" },
1329 	{ }
1330 };
1331 MODULE_DEVICE_TABLE(of, atmel_isi_of_match);
1332 
1333 static struct platform_driver atmel_isi_driver = {
1334 	.driver		= {
1335 		.name = "atmel_isi",
1336 		.of_match_table = of_match_ptr(atmel_isi_of_match),
1337 		.pm	= &atmel_isi_dev_pm_ops,
1338 	},
1339 	.probe		= atmel_isi_probe,
1340 	.remove		= atmel_isi_remove,
1341 };
1342 
1343 module_platform_driver(atmel_isi_driver);
1344 
1345 MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>");
1346 MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux");
1347 MODULE_LICENSE("GPL");
1348 MODULE_SUPPORTED_DEVICE("video");
1349