1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * SuperH Video Output Unit (VOU) driver
4  *
5  * Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
6  */
7 
8 #include <linux/dma-mapping.h>
9 #include <linux/delay.h>
10 #include <linux/errno.h>
11 #include <linux/fs.h>
12 #include <linux/i2c.h>
13 #include <linux/init.h>
14 #include <linux/interrupt.h>
15 #include <linux/kernel.h>
16 #include <linux/platform_device.h>
17 #include <linux/pm_runtime.h>
18 #include <linux/slab.h>
19 #include <linux/videodev2.h>
20 #include <linux/module.h>
21 
22 #include <media/drv-intf/sh_vou.h>
23 #include <media/v4l2-common.h>
24 #include <media/v4l2-device.h>
25 #include <media/v4l2-ioctl.h>
26 #include <media/v4l2-mediabus.h>
27 #include <media/videobuf2-v4l2.h>
28 #include <media/videobuf2-dma-contig.h>
29 
30 /* Mirror addresses are not available for all registers */
31 #define VOUER	0
32 #define VOUCR	4
33 #define VOUSTR	8
34 #define VOUVCR	0xc
35 #define VOUISR	0x10
36 #define VOUBCR	0x14
37 #define VOUDPR	0x18
38 #define VOUDSR	0x1c
39 #define VOUVPR	0x20
40 #define VOUIR	0x24
41 #define VOUSRR	0x28
42 #define VOUMSR	0x2c
43 #define VOUHIR	0x30
44 #define VOUDFR	0x34
45 #define VOUAD1R	0x38
46 #define VOUAD2R	0x3c
47 #define VOUAIR	0x40
48 #define VOUSWR	0x44
49 #define VOURCR	0x48
50 #define VOURPR	0x50
51 
52 enum sh_vou_status {
53 	SH_VOU_IDLE,
54 	SH_VOU_INITIALISING,
55 	SH_VOU_RUNNING,
56 };
57 
58 #define VOU_MIN_IMAGE_WIDTH	16
59 #define VOU_MAX_IMAGE_WIDTH	720
60 #define VOU_MIN_IMAGE_HEIGHT	16
61 
62 struct sh_vou_buffer {
63 	struct vb2_v4l2_buffer vb;
64 	struct list_head list;
65 };
66 
67 static inline struct
68 sh_vou_buffer *to_sh_vou_buffer(struct vb2_v4l2_buffer *vb2)
69 {
70 	return container_of(vb2, struct sh_vou_buffer, vb);
71 }
72 
73 struct sh_vou_device {
74 	struct v4l2_device v4l2_dev;
75 	struct video_device vdev;
76 	struct sh_vou_pdata *pdata;
77 	spinlock_t lock;
78 	void __iomem *base;
79 	/* State information */
80 	struct v4l2_pix_format pix;
81 	struct v4l2_rect rect;
82 	struct list_head buf_list;
83 	v4l2_std_id std;
84 	int pix_idx;
85 	struct vb2_queue queue;
86 	struct sh_vou_buffer *active;
87 	enum sh_vou_status status;
88 	unsigned sequence;
89 	struct mutex fop_lock;
90 };
91 
92 /* Register access routines for sides A, B and mirror addresses */
93 static void sh_vou_reg_a_write(struct sh_vou_device *vou_dev, unsigned int reg,
94 			       u32 value)
95 {
96 	__raw_writel(value, vou_dev->base + reg);
97 }
98 
99 static void sh_vou_reg_ab_write(struct sh_vou_device *vou_dev, unsigned int reg,
100 				u32 value)
101 {
102 	__raw_writel(value, vou_dev->base + reg);
103 	__raw_writel(value, vou_dev->base + reg + 0x1000);
104 }
105 
106 static void sh_vou_reg_m_write(struct sh_vou_device *vou_dev, unsigned int reg,
107 			       u32 value)
108 {
109 	__raw_writel(value, vou_dev->base + reg + 0x2000);
110 }
111 
112 static u32 sh_vou_reg_a_read(struct sh_vou_device *vou_dev, unsigned int reg)
113 {
114 	return __raw_readl(vou_dev->base + reg);
115 }
116 
117 static void sh_vou_reg_a_set(struct sh_vou_device *vou_dev, unsigned int reg,
118 			     u32 value, u32 mask)
119 {
120 	u32 old = __raw_readl(vou_dev->base + reg);
121 
122 	value = (value & mask) | (old & ~mask);
123 	__raw_writel(value, vou_dev->base + reg);
124 }
125 
126 static void sh_vou_reg_b_set(struct sh_vou_device *vou_dev, unsigned int reg,
127 			     u32 value, u32 mask)
128 {
129 	sh_vou_reg_a_set(vou_dev, reg + 0x1000, value, mask);
130 }
131 
132 static void sh_vou_reg_ab_set(struct sh_vou_device *vou_dev, unsigned int reg,
133 			      u32 value, u32 mask)
134 {
135 	sh_vou_reg_a_set(vou_dev, reg, value, mask);
136 	sh_vou_reg_b_set(vou_dev, reg, value, mask);
137 }
138 
139 struct sh_vou_fmt {
140 	u32		pfmt;
141 	unsigned char	bpp;
142 	unsigned char	bpl;
143 	unsigned char	rgb;
144 	unsigned char	yf;
145 	unsigned char	pkf;
146 };
147 
148 /* Further pixel formats can be added */
149 static struct sh_vou_fmt vou_fmt[] = {
150 	{
151 		.pfmt	= V4L2_PIX_FMT_NV12,
152 		.bpp	= 12,
153 		.bpl	= 1,
154 		.yf	= 0,
155 		.rgb	= 0,
156 	},
157 	{
158 		.pfmt	= V4L2_PIX_FMT_NV16,
159 		.bpp	= 16,
160 		.bpl	= 1,
161 		.yf	= 1,
162 		.rgb	= 0,
163 	},
164 	{
165 		.pfmt	= V4L2_PIX_FMT_RGB24,
166 		.bpp	= 24,
167 		.bpl	= 3,
168 		.pkf	= 2,
169 		.rgb	= 1,
170 	},
171 	{
172 		.pfmt	= V4L2_PIX_FMT_RGB565,
173 		.bpp	= 16,
174 		.bpl	= 2,
175 		.pkf	= 3,
176 		.rgb	= 1,
177 	},
178 	{
179 		.pfmt	= V4L2_PIX_FMT_RGB565X,
180 		.bpp	= 16,
181 		.bpl	= 2,
182 		.pkf	= 3,
183 		.rgb	= 1,
184 	},
185 };
186 
187 static void sh_vou_schedule_next(struct sh_vou_device *vou_dev,
188 				 struct vb2_v4l2_buffer *vbuf)
189 {
190 	dma_addr_t addr1, addr2;
191 
192 	addr1 = vb2_dma_contig_plane_dma_addr(&vbuf->vb2_buf, 0);
193 	switch (vou_dev->pix.pixelformat) {
194 	case V4L2_PIX_FMT_NV12:
195 	case V4L2_PIX_FMT_NV16:
196 		addr2 = addr1 + vou_dev->pix.width * vou_dev->pix.height;
197 		break;
198 	default:
199 		addr2 = 0;
200 	}
201 
202 	sh_vou_reg_m_write(vou_dev, VOUAD1R, addr1);
203 	sh_vou_reg_m_write(vou_dev, VOUAD2R, addr2);
204 }
205 
206 static void sh_vou_stream_config(struct sh_vou_device *vou_dev)
207 {
208 	unsigned int row_coeff;
209 #ifdef __LITTLE_ENDIAN
210 	u32 dataswap = 7;
211 #else
212 	u32 dataswap = 0;
213 #endif
214 
215 	switch (vou_dev->pix.pixelformat) {
216 	default:
217 	case V4L2_PIX_FMT_NV12:
218 	case V4L2_PIX_FMT_NV16:
219 		row_coeff = 1;
220 		break;
221 	case V4L2_PIX_FMT_RGB565:
222 		dataswap ^= 1;
223 		fallthrough;
224 	case V4L2_PIX_FMT_RGB565X:
225 		row_coeff = 2;
226 		break;
227 	case V4L2_PIX_FMT_RGB24:
228 		row_coeff = 3;
229 		break;
230 	}
231 
232 	sh_vou_reg_a_write(vou_dev, VOUSWR, dataswap);
233 	sh_vou_reg_ab_write(vou_dev, VOUAIR, vou_dev->pix.width * row_coeff);
234 }
235 
236 /* Locking: caller holds fop_lock mutex */
237 static int sh_vou_queue_setup(struct vb2_queue *vq,
238 		       unsigned int *nbuffers, unsigned int *nplanes,
239 		       unsigned int sizes[], struct device *alloc_devs[])
240 {
241 	struct sh_vou_device *vou_dev = vb2_get_drv_priv(vq);
242 	struct v4l2_pix_format *pix = &vou_dev->pix;
243 	int bytes_per_line = vou_fmt[vou_dev->pix_idx].bpp * pix->width / 8;
244 
245 	dev_dbg(vou_dev->v4l2_dev.dev, "%s()\n", __func__);
246 
247 	if (*nplanes)
248 		return sizes[0] < pix->height * bytes_per_line ? -EINVAL : 0;
249 	*nplanes = 1;
250 	sizes[0] = pix->height * bytes_per_line;
251 	return 0;
252 }
253 
254 static int sh_vou_buf_prepare(struct vb2_buffer *vb)
255 {
256 	struct sh_vou_device *vou_dev = vb2_get_drv_priv(vb->vb2_queue);
257 	struct v4l2_pix_format *pix = &vou_dev->pix;
258 	unsigned bytes_per_line = vou_fmt[vou_dev->pix_idx].bpp * pix->width / 8;
259 	unsigned size = pix->height * bytes_per_line;
260 
261 	dev_dbg(vou_dev->v4l2_dev.dev, "%s()\n", __func__);
262 
263 	if (vb2_plane_size(vb, 0) < size) {
264 		/* User buffer too small */
265 		dev_warn(vou_dev->v4l2_dev.dev, "buffer too small (%lu < %u)\n",
266 			 vb2_plane_size(vb, 0), size);
267 		return -EINVAL;
268 	}
269 
270 	vb2_set_plane_payload(vb, 0, size);
271 	return 0;
272 }
273 
274 /* Locking: caller holds fop_lock mutex and vq->irqlock spinlock */
275 static void sh_vou_buf_queue(struct vb2_buffer *vb)
276 {
277 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
278 	struct sh_vou_device *vou_dev = vb2_get_drv_priv(vb->vb2_queue);
279 	struct sh_vou_buffer *shbuf = to_sh_vou_buffer(vbuf);
280 	unsigned long flags;
281 
282 	spin_lock_irqsave(&vou_dev->lock, flags);
283 	list_add_tail(&shbuf->list, &vou_dev->buf_list);
284 	spin_unlock_irqrestore(&vou_dev->lock, flags);
285 }
286 
287 static int sh_vou_start_streaming(struct vb2_queue *vq, unsigned int count)
288 {
289 	struct sh_vou_device *vou_dev = vb2_get_drv_priv(vq);
290 	struct sh_vou_buffer *buf, *node;
291 	int ret;
292 
293 	vou_dev->sequence = 0;
294 	ret = v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0,
295 					 video, s_stream, 1);
296 	if (ret < 0 && ret != -ENOIOCTLCMD) {
297 		list_for_each_entry_safe(buf, node, &vou_dev->buf_list, list) {
298 			vb2_buffer_done(&buf->vb.vb2_buf,
299 					VB2_BUF_STATE_QUEUED);
300 			list_del(&buf->list);
301 		}
302 		vou_dev->active = NULL;
303 		return ret;
304 	}
305 
306 	buf = list_entry(vou_dev->buf_list.next, struct sh_vou_buffer, list);
307 
308 	vou_dev->active = buf;
309 
310 	/* Start from side A: we use mirror addresses, so, set B */
311 	sh_vou_reg_a_write(vou_dev, VOURPR, 1);
312 	dev_dbg(vou_dev->v4l2_dev.dev, "%s: first buffer status 0x%x\n",
313 		__func__, sh_vou_reg_a_read(vou_dev, VOUSTR));
314 	sh_vou_schedule_next(vou_dev, &buf->vb);
315 
316 	buf = list_entry(buf->list.next, struct sh_vou_buffer, list);
317 
318 	/* Second buffer - initialise register side B */
319 	sh_vou_reg_a_write(vou_dev, VOURPR, 0);
320 	sh_vou_schedule_next(vou_dev, &buf->vb);
321 
322 	/* Register side switching with frame VSYNC */
323 	sh_vou_reg_a_write(vou_dev, VOURCR, 5);
324 
325 	sh_vou_stream_config(vou_dev);
326 	/* Enable End-of-Frame (VSYNC) interrupts */
327 	sh_vou_reg_a_write(vou_dev, VOUIR, 0x10004);
328 
329 	/* Two buffers on the queue - activate the hardware */
330 	vou_dev->status = SH_VOU_RUNNING;
331 	sh_vou_reg_a_write(vou_dev, VOUER, 0x107);
332 	return 0;
333 }
334 
335 static void sh_vou_stop_streaming(struct vb2_queue *vq)
336 {
337 	struct sh_vou_device *vou_dev = vb2_get_drv_priv(vq);
338 	struct sh_vou_buffer *buf, *node;
339 	unsigned long flags;
340 
341 	v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0,
342 					 video, s_stream, 0);
343 	/* disable output */
344 	sh_vou_reg_a_set(vou_dev, VOUER, 0, 1);
345 	/* ...but the current frame will complete */
346 	sh_vou_reg_a_set(vou_dev, VOUIR, 0, 0x30000);
347 	msleep(50);
348 	spin_lock_irqsave(&vou_dev->lock, flags);
349 	list_for_each_entry_safe(buf, node, &vou_dev->buf_list, list) {
350 		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
351 		list_del(&buf->list);
352 	}
353 	vou_dev->active = NULL;
354 	spin_unlock_irqrestore(&vou_dev->lock, flags);
355 }
356 
357 static const struct vb2_ops sh_vou_qops = {
358 	.queue_setup		= sh_vou_queue_setup,
359 	.buf_prepare		= sh_vou_buf_prepare,
360 	.buf_queue		= sh_vou_buf_queue,
361 	.start_streaming	= sh_vou_start_streaming,
362 	.stop_streaming		= sh_vou_stop_streaming,
363 	.wait_prepare		= vb2_ops_wait_prepare,
364 	.wait_finish		= vb2_ops_wait_finish,
365 };
366 
367 /* Video IOCTLs */
368 static int sh_vou_querycap(struct file *file, void  *priv,
369 			   struct v4l2_capability *cap)
370 {
371 	struct sh_vou_device *vou_dev = video_drvdata(file);
372 
373 	dev_dbg(vou_dev->v4l2_dev.dev, "%s()\n", __func__);
374 
375 	strscpy(cap->card, "SuperH VOU", sizeof(cap->card));
376 	strscpy(cap->driver, "sh-vou", sizeof(cap->driver));
377 	strscpy(cap->bus_info, "platform:sh-vou", sizeof(cap->bus_info));
378 	return 0;
379 }
380 
381 /* Enumerate formats, that the device can accept from the user */
382 static int sh_vou_enum_fmt_vid_out(struct file *file, void  *priv,
383 				   struct v4l2_fmtdesc *fmt)
384 {
385 	struct sh_vou_device *vou_dev = video_drvdata(file);
386 
387 	if (fmt->index >= ARRAY_SIZE(vou_fmt))
388 		return -EINVAL;
389 
390 	dev_dbg(vou_dev->v4l2_dev.dev, "%s()\n", __func__);
391 
392 	fmt->pixelformat = vou_fmt[fmt->index].pfmt;
393 
394 	return 0;
395 }
396 
397 static int sh_vou_g_fmt_vid_out(struct file *file, void *priv,
398 				struct v4l2_format *fmt)
399 {
400 	struct sh_vou_device *vou_dev = video_drvdata(file);
401 
402 	dev_dbg(vou_dev->v4l2_dev.dev, "%s()\n", __func__);
403 
404 	fmt->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
405 	fmt->fmt.pix = vou_dev->pix;
406 
407 	return 0;
408 }
409 
410 static const unsigned char vou_scale_h_num[] = {1, 9, 2, 9, 4};
411 static const unsigned char vou_scale_h_den[] = {1, 8, 1, 4, 1};
412 static const unsigned char vou_scale_h_fld[] = {0, 2, 1, 3};
413 static const unsigned char vou_scale_v_num[] = {1, 2, 4};
414 static const unsigned char vou_scale_v_den[] = {1, 1, 1};
415 static const unsigned char vou_scale_v_fld[] = {0, 1};
416 
417 static void sh_vou_configure_geometry(struct sh_vou_device *vou_dev,
418 				      int pix_idx, int w_idx, int h_idx)
419 {
420 	struct sh_vou_fmt *fmt = vou_fmt + pix_idx;
421 	unsigned int black_left, black_top, width_max,
422 		frame_in_height, frame_out_height, frame_out_top;
423 	struct v4l2_rect *rect = &vou_dev->rect;
424 	struct v4l2_pix_format *pix = &vou_dev->pix;
425 	u32 vouvcr = 0, dsr_h, dsr_v;
426 
427 	if (vou_dev->std & V4L2_STD_525_60) {
428 		width_max = 858;
429 		/* height_max = 262; */
430 	} else {
431 		width_max = 864;
432 		/* height_max = 312; */
433 	}
434 
435 	frame_in_height = pix->height / 2;
436 	frame_out_height = rect->height / 2;
437 	frame_out_top = rect->top / 2;
438 
439 	/*
440 	 * Cropping scheme: max useful image is 720x480, and the total video
441 	 * area is 858x525 (NTSC) or 864x625 (PAL). AK8813 / 8814 starts
442 	 * sampling data beginning with fixed 276th (NTSC) / 288th (PAL) clock,
443 	 * of which the first 33 / 25 clocks HSYNC must be held active. This
444 	 * has to be configured in CR[HW]. 1 pixel equals 2 clock periods.
445 	 * This gives CR[HW] = 16 / 12, VPR[HVP] = 138 / 144, which gives
446 	 * exactly 858 - 138 = 864 - 144 = 720! We call the out-of-display area,
447 	 * beyond DSR, specified on the left and top by the VPR register "black
448 	 * pixels" and out-of-image area (DPR) "background pixels." We fix VPR
449 	 * at 138 / 144 : 20, because that's the HSYNC timing, that our first
450 	 * client requires, and that's exactly what leaves us 720 pixels for the
451 	 * image; we leave VPR[VVP] at default 20 for now, because the client
452 	 * doesn't seem to have any special requirements for it. Otherwise we
453 	 * could also set it to max - 240 = 22 / 72. Thus VPR depends only on
454 	 * the selected standard, and DPR and DSR are selected according to
455 	 * cropping. Q: how does the client detect the first valid line? Does
456 	 * HSYNC stay inactive during invalid (black) lines?
457 	 */
458 	black_left = width_max - VOU_MAX_IMAGE_WIDTH;
459 	black_top = 20;
460 
461 	dsr_h = rect->width + rect->left;
462 	dsr_v = frame_out_height + frame_out_top;
463 
464 	dev_dbg(vou_dev->v4l2_dev.dev,
465 		"image %ux%u, black %u:%u, offset %u:%u, display %ux%u\n",
466 		pix->width, frame_in_height, black_left, black_top,
467 		rect->left, frame_out_top, dsr_h, dsr_v);
468 
469 	/* VOUISR height - half of a frame height in frame mode */
470 	sh_vou_reg_ab_write(vou_dev, VOUISR, (pix->width << 16) | frame_in_height);
471 	sh_vou_reg_ab_write(vou_dev, VOUVPR, (black_left << 16) | black_top);
472 	sh_vou_reg_ab_write(vou_dev, VOUDPR, (rect->left << 16) | frame_out_top);
473 	sh_vou_reg_ab_write(vou_dev, VOUDSR, (dsr_h << 16) | dsr_v);
474 
475 	/*
476 	 * if necessary, we could set VOUHIR to
477 	 * max(black_left + dsr_h, width_max) here
478 	 */
479 
480 	if (w_idx)
481 		vouvcr |= (1 << 15) | (vou_scale_h_fld[w_idx - 1] << 4);
482 	if (h_idx)
483 		vouvcr |= (1 << 14) | vou_scale_v_fld[h_idx - 1];
484 
485 	dev_dbg(vou_dev->v4l2_dev.dev, "0x%08x: scaling 0x%x\n",
486 		fmt->pfmt, vouvcr);
487 
488 	/* To produce a colour bar for testing set bit 23 of VOUVCR */
489 	sh_vou_reg_ab_write(vou_dev, VOUVCR, vouvcr);
490 	sh_vou_reg_ab_write(vou_dev, VOUDFR,
491 			    fmt->pkf | (fmt->yf << 8) | (fmt->rgb << 16));
492 }
493 
494 struct sh_vou_geometry {
495 	struct v4l2_rect output;
496 	unsigned int in_width;
497 	unsigned int in_height;
498 	int scale_idx_h;
499 	int scale_idx_v;
500 };
501 
502 /*
503  * Find input geometry, that we can use to produce output, closest to the
504  * requested rectangle, using VOU scaling
505  */
506 static void vou_adjust_input(struct sh_vou_geometry *geo, v4l2_std_id std)
507 {
508 	/* The compiler cannot know, that best and idx will indeed be set */
509 	unsigned int best_err = UINT_MAX, best = 0, img_height_max;
510 	int i, idx = 0;
511 
512 	if (std & V4L2_STD_525_60)
513 		img_height_max = 480;
514 	else
515 		img_height_max = 576;
516 
517 	/* Image width must be a multiple of 4 */
518 	v4l_bound_align_image(&geo->in_width,
519 			      VOU_MIN_IMAGE_WIDTH, VOU_MAX_IMAGE_WIDTH, 2,
520 			      &geo->in_height,
521 			      VOU_MIN_IMAGE_HEIGHT, img_height_max, 1, 0);
522 
523 	/* Select scales to come as close as possible to the output image */
524 	for (i = ARRAY_SIZE(vou_scale_h_num) - 1; i >= 0; i--) {
525 		unsigned int err;
526 		unsigned int found = geo->output.width * vou_scale_h_den[i] /
527 			vou_scale_h_num[i];
528 
529 		if (found > VOU_MAX_IMAGE_WIDTH)
530 			/* scales increase */
531 			break;
532 
533 		err = abs(found - geo->in_width);
534 		if (err < best_err) {
535 			best_err = err;
536 			idx = i;
537 			best = found;
538 		}
539 		if (!err)
540 			break;
541 	}
542 
543 	geo->in_width = best;
544 	geo->scale_idx_h = idx;
545 
546 	best_err = UINT_MAX;
547 
548 	/* This loop can be replaced with one division */
549 	for (i = ARRAY_SIZE(vou_scale_v_num) - 1; i >= 0; i--) {
550 		unsigned int err;
551 		unsigned int found = geo->output.height * vou_scale_v_den[i] /
552 			vou_scale_v_num[i];
553 
554 		if (found > img_height_max)
555 			/* scales increase */
556 			break;
557 
558 		err = abs(found - geo->in_height);
559 		if (err < best_err) {
560 			best_err = err;
561 			idx = i;
562 			best = found;
563 		}
564 		if (!err)
565 			break;
566 	}
567 
568 	geo->in_height = best;
569 	geo->scale_idx_v = idx;
570 }
571 
572 /*
573  * Find output geometry, that we can produce, using VOU scaling, closest to
574  * the requested rectangle
575  */
576 static void vou_adjust_output(struct sh_vou_geometry *geo, v4l2_std_id std)
577 {
578 	unsigned int best_err = UINT_MAX, best = geo->in_width,
579 		width_max, height_max, img_height_max;
580 	int i, idx_h = 0, idx_v = 0;
581 
582 	if (std & V4L2_STD_525_60) {
583 		width_max = 858;
584 		height_max = 262 * 2;
585 		img_height_max = 480;
586 	} else {
587 		width_max = 864;
588 		height_max = 312 * 2;
589 		img_height_max = 576;
590 	}
591 
592 	/* Select scales to come as close as possible to the output image */
593 	for (i = 0; i < ARRAY_SIZE(vou_scale_h_num); i++) {
594 		unsigned int err;
595 		unsigned int found = geo->in_width * vou_scale_h_num[i] /
596 			vou_scale_h_den[i];
597 
598 		if (found > VOU_MAX_IMAGE_WIDTH)
599 			/* scales increase */
600 			break;
601 
602 		err = abs(found - geo->output.width);
603 		if (err < best_err) {
604 			best_err = err;
605 			idx_h = i;
606 			best = found;
607 		}
608 		if (!err)
609 			break;
610 	}
611 
612 	geo->output.width = best;
613 	geo->scale_idx_h = idx_h;
614 	if (geo->output.left + best > width_max)
615 		geo->output.left = width_max - best;
616 
617 	pr_debug("%s(): W %u * %u/%u = %u\n", __func__, geo->in_width,
618 		 vou_scale_h_num[idx_h], vou_scale_h_den[idx_h], best);
619 
620 	best_err = UINT_MAX;
621 
622 	/* This loop can be replaced with one division */
623 	for (i = 0; i < ARRAY_SIZE(vou_scale_v_num); i++) {
624 		unsigned int err;
625 		unsigned int found = geo->in_height * vou_scale_v_num[i] /
626 			vou_scale_v_den[i];
627 
628 		if (found > img_height_max)
629 			/* scales increase */
630 			break;
631 
632 		err = abs(found - geo->output.height);
633 		if (err < best_err) {
634 			best_err = err;
635 			idx_v = i;
636 			best = found;
637 		}
638 		if (!err)
639 			break;
640 	}
641 
642 	geo->output.height = best;
643 	geo->scale_idx_v = idx_v;
644 	if (geo->output.top + best > height_max)
645 		geo->output.top = height_max - best;
646 
647 	pr_debug("%s(): H %u * %u/%u = %u\n", __func__, geo->in_height,
648 		 vou_scale_v_num[idx_v], vou_scale_v_den[idx_v], best);
649 }
650 
651 static int sh_vou_try_fmt_vid_out(struct file *file, void *priv,
652 				  struct v4l2_format *fmt)
653 {
654 	struct sh_vou_device *vou_dev = video_drvdata(file);
655 	struct v4l2_pix_format *pix = &fmt->fmt.pix;
656 	unsigned int img_height_max;
657 	int pix_idx;
658 
659 	dev_dbg(vou_dev->v4l2_dev.dev, "%s()\n", __func__);
660 
661 	pix->field = V4L2_FIELD_INTERLACED;
662 	pix->colorspace = V4L2_COLORSPACE_SMPTE170M;
663 	pix->ycbcr_enc = pix->quantization = 0;
664 
665 	for (pix_idx = 0; pix_idx < ARRAY_SIZE(vou_fmt); pix_idx++)
666 		if (vou_fmt[pix_idx].pfmt == pix->pixelformat)
667 			break;
668 
669 	if (pix_idx == ARRAY_SIZE(vou_fmt))
670 		return -EINVAL;
671 
672 	if (vou_dev->std & V4L2_STD_525_60)
673 		img_height_max = 480;
674 	else
675 		img_height_max = 576;
676 
677 	v4l_bound_align_image(&pix->width,
678 			      VOU_MIN_IMAGE_WIDTH, VOU_MAX_IMAGE_WIDTH, 2,
679 			      &pix->height,
680 			      VOU_MIN_IMAGE_HEIGHT, img_height_max, 1, 0);
681 	pix->bytesperline = pix->width * vou_fmt[pix_idx].bpl;
682 	pix->sizeimage = pix->height * ((pix->width * vou_fmt[pix_idx].bpp) >> 3);
683 
684 	return 0;
685 }
686 
687 static int sh_vou_set_fmt_vid_out(struct sh_vou_device *vou_dev,
688 				struct v4l2_pix_format *pix)
689 {
690 	unsigned int img_height_max;
691 	struct sh_vou_geometry geo;
692 	struct v4l2_subdev_format format = {
693 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
694 		/* Revisit: is this the correct code? */
695 		.format.code = MEDIA_BUS_FMT_YUYV8_2X8,
696 		.format.field = V4L2_FIELD_INTERLACED,
697 		.format.colorspace = V4L2_COLORSPACE_SMPTE170M,
698 	};
699 	struct v4l2_mbus_framefmt *mbfmt = &format.format;
700 	int pix_idx;
701 	int ret;
702 
703 	if (vb2_is_busy(&vou_dev->queue))
704 		return -EBUSY;
705 
706 	for (pix_idx = 0; pix_idx < ARRAY_SIZE(vou_fmt); pix_idx++)
707 		if (vou_fmt[pix_idx].pfmt == pix->pixelformat)
708 			break;
709 
710 	geo.in_width = pix->width;
711 	geo.in_height = pix->height;
712 	geo.output = vou_dev->rect;
713 
714 	vou_adjust_output(&geo, vou_dev->std);
715 
716 	mbfmt->width = geo.output.width;
717 	mbfmt->height = geo.output.height;
718 	ret = v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, pad,
719 					 set_fmt, NULL, &format);
720 	/* Must be implemented, so, don't check for -ENOIOCTLCMD */
721 	if (ret < 0)
722 		return ret;
723 
724 	dev_dbg(vou_dev->v4l2_dev.dev, "%s(): %ux%u -> %ux%u\n", __func__,
725 		geo.output.width, geo.output.height, mbfmt->width, mbfmt->height);
726 
727 	if (vou_dev->std & V4L2_STD_525_60)
728 		img_height_max = 480;
729 	else
730 		img_height_max = 576;
731 
732 	/* Sanity checks */
733 	if ((unsigned)mbfmt->width > VOU_MAX_IMAGE_WIDTH ||
734 	    (unsigned)mbfmt->height > img_height_max ||
735 	    mbfmt->code != MEDIA_BUS_FMT_YUYV8_2X8)
736 		return -EIO;
737 
738 	if (mbfmt->width != geo.output.width ||
739 	    mbfmt->height != geo.output.height) {
740 		geo.output.width = mbfmt->width;
741 		geo.output.height = mbfmt->height;
742 
743 		vou_adjust_input(&geo, vou_dev->std);
744 	}
745 
746 	/* We tried to preserve output rectangle, but it could have changed */
747 	vou_dev->rect = geo.output;
748 	pix->width = geo.in_width;
749 	pix->height = geo.in_height;
750 
751 	dev_dbg(vou_dev->v4l2_dev.dev, "%s(): %ux%u\n", __func__,
752 		pix->width, pix->height);
753 
754 	vou_dev->pix_idx = pix_idx;
755 
756 	vou_dev->pix = *pix;
757 
758 	sh_vou_configure_geometry(vou_dev, pix_idx,
759 				  geo.scale_idx_h, geo.scale_idx_v);
760 
761 	return 0;
762 }
763 
764 static int sh_vou_s_fmt_vid_out(struct file *file, void *priv,
765 				struct v4l2_format *fmt)
766 {
767 	struct sh_vou_device *vou_dev = video_drvdata(file);
768 	int ret = sh_vou_try_fmt_vid_out(file, priv, fmt);
769 
770 	if (ret)
771 		return ret;
772 	return sh_vou_set_fmt_vid_out(vou_dev, &fmt->fmt.pix);
773 }
774 
775 static int sh_vou_enum_output(struct file *file, void *fh,
776 			      struct v4l2_output *a)
777 {
778 	struct sh_vou_device *vou_dev = video_drvdata(file);
779 
780 	if (a->index)
781 		return -EINVAL;
782 	strscpy(a->name, "Video Out", sizeof(a->name));
783 	a->type = V4L2_OUTPUT_TYPE_ANALOG;
784 	a->std = vou_dev->vdev.tvnorms;
785 	return 0;
786 }
787 
788 static int sh_vou_g_output(struct file *file, void *fh, unsigned int *i)
789 {
790 	*i = 0;
791 	return 0;
792 }
793 
794 static int sh_vou_s_output(struct file *file, void *fh, unsigned int i)
795 {
796 	return i ? -EINVAL : 0;
797 }
798 
799 static u32 sh_vou_ntsc_mode(enum sh_vou_bus_fmt bus_fmt)
800 {
801 	switch (bus_fmt) {
802 	default:
803 		pr_warn("%s(): Invalid bus-format code %d, using default 8-bit\n",
804 			__func__, bus_fmt);
805 		fallthrough;
806 	case SH_VOU_BUS_8BIT:
807 		return 1;
808 	case SH_VOU_BUS_16BIT:
809 		return 0;
810 	case SH_VOU_BUS_BT656:
811 		return 3;
812 	}
813 }
814 
815 static int sh_vou_s_std(struct file *file, void *priv, v4l2_std_id std_id)
816 {
817 	struct sh_vou_device *vou_dev = video_drvdata(file);
818 	int ret;
819 
820 	dev_dbg(vou_dev->v4l2_dev.dev, "%s(): 0x%llx\n", __func__, std_id);
821 
822 	if (std_id == vou_dev->std)
823 		return 0;
824 
825 	if (vb2_is_busy(&vou_dev->queue))
826 		return -EBUSY;
827 
828 	ret = v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, video,
829 					 s_std_output, std_id);
830 	/* Shall we continue, if the subdev doesn't support .s_std_output()? */
831 	if (ret < 0 && ret != -ENOIOCTLCMD)
832 		return ret;
833 
834 	vou_dev->rect.top = vou_dev->rect.left = 0;
835 	vou_dev->rect.width = VOU_MAX_IMAGE_WIDTH;
836 	if (std_id & V4L2_STD_525_60) {
837 		sh_vou_reg_ab_set(vou_dev, VOUCR,
838 			sh_vou_ntsc_mode(vou_dev->pdata->bus_fmt) << 29, 7 << 29);
839 		vou_dev->rect.height = 480;
840 	} else {
841 		sh_vou_reg_ab_set(vou_dev, VOUCR, 5 << 29, 7 << 29);
842 		vou_dev->rect.height = 576;
843 	}
844 
845 	vou_dev->pix.width = vou_dev->rect.width;
846 	vou_dev->pix.height = vou_dev->rect.height;
847 	vou_dev->pix.bytesperline =
848 		vou_dev->pix.width * vou_fmt[vou_dev->pix_idx].bpl;
849 	vou_dev->pix.sizeimage = vou_dev->pix.height *
850 		((vou_dev->pix.width * vou_fmt[vou_dev->pix_idx].bpp) >> 3);
851 	vou_dev->std = std_id;
852 	sh_vou_set_fmt_vid_out(vou_dev, &vou_dev->pix);
853 
854 	return 0;
855 }
856 
857 static int sh_vou_g_std(struct file *file, void *priv, v4l2_std_id *std)
858 {
859 	struct sh_vou_device *vou_dev = video_drvdata(file);
860 
861 	dev_dbg(vou_dev->v4l2_dev.dev, "%s()\n", __func__);
862 
863 	*std = vou_dev->std;
864 
865 	return 0;
866 }
867 
868 static int sh_vou_log_status(struct file *file, void *priv)
869 {
870 	struct sh_vou_device *vou_dev = video_drvdata(file);
871 
872 	pr_info("VOUER:   0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUER));
873 	pr_info("VOUCR:   0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUCR));
874 	pr_info("VOUSTR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUSTR));
875 	pr_info("VOUVCR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUVCR));
876 	pr_info("VOUISR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUISR));
877 	pr_info("VOUBCR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUBCR));
878 	pr_info("VOUDPR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUDPR));
879 	pr_info("VOUDSR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUDSR));
880 	pr_info("VOUVPR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUVPR));
881 	pr_info("VOUIR:   0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUIR));
882 	pr_info("VOUSRR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUSRR));
883 	pr_info("VOUMSR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUMSR));
884 	pr_info("VOUHIR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUHIR));
885 	pr_info("VOUDFR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUDFR));
886 	pr_info("VOUAD1R: 0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUAD1R));
887 	pr_info("VOUAD2R: 0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUAD2R));
888 	pr_info("VOUAIR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUAIR));
889 	pr_info("VOUSWR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUSWR));
890 	pr_info("VOURCR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOURCR));
891 	pr_info("VOURPR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOURPR));
892 	return 0;
893 }
894 
895 static int sh_vou_g_selection(struct file *file, void *fh,
896 			      struct v4l2_selection *sel)
897 {
898 	struct sh_vou_device *vou_dev = video_drvdata(file);
899 
900 	if (sel->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
901 		return -EINVAL;
902 	switch (sel->target) {
903 	case V4L2_SEL_TGT_COMPOSE:
904 		sel->r = vou_dev->rect;
905 		break;
906 	case V4L2_SEL_TGT_COMPOSE_DEFAULT:
907 	case V4L2_SEL_TGT_COMPOSE_BOUNDS:
908 		sel->r.left = 0;
909 		sel->r.top = 0;
910 		sel->r.width = VOU_MAX_IMAGE_WIDTH;
911 		if (vou_dev->std & V4L2_STD_525_60)
912 			sel->r.height = 480;
913 		else
914 			sel->r.height = 576;
915 		break;
916 	default:
917 		return -EINVAL;
918 	}
919 	return 0;
920 }
921 
922 /* Assume a dull encoder, do all the work ourselves. */
923 static int sh_vou_s_selection(struct file *file, void *fh,
924 			      struct v4l2_selection *sel)
925 {
926 	struct v4l2_rect *rect = &sel->r;
927 	struct sh_vou_device *vou_dev = video_drvdata(file);
928 	struct v4l2_subdev_selection sd_sel = {
929 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
930 		.target = V4L2_SEL_TGT_COMPOSE,
931 	};
932 	struct v4l2_pix_format *pix = &vou_dev->pix;
933 	struct sh_vou_geometry geo;
934 	struct v4l2_subdev_format format = {
935 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
936 		/* Revisit: is this the correct code? */
937 		.format.code = MEDIA_BUS_FMT_YUYV8_2X8,
938 		.format.field = V4L2_FIELD_INTERLACED,
939 		.format.colorspace = V4L2_COLORSPACE_SMPTE170M,
940 	};
941 	unsigned int img_height_max;
942 	int ret;
943 
944 	if (sel->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
945 	    sel->target != V4L2_SEL_TGT_COMPOSE)
946 		return -EINVAL;
947 
948 	if (vb2_is_busy(&vou_dev->queue))
949 		return -EBUSY;
950 
951 	if (vou_dev->std & V4L2_STD_525_60)
952 		img_height_max = 480;
953 	else
954 		img_height_max = 576;
955 
956 	v4l_bound_align_image(&rect->width,
957 			      VOU_MIN_IMAGE_WIDTH, VOU_MAX_IMAGE_WIDTH, 1,
958 			      &rect->height,
959 			      VOU_MIN_IMAGE_HEIGHT, img_height_max, 1, 0);
960 
961 	if (rect->width + rect->left > VOU_MAX_IMAGE_WIDTH)
962 		rect->left = VOU_MAX_IMAGE_WIDTH - rect->width;
963 
964 	if (rect->height + rect->top > img_height_max)
965 		rect->top = img_height_max - rect->height;
966 
967 	geo.output = *rect;
968 	geo.in_width = pix->width;
969 	geo.in_height = pix->height;
970 
971 	/* Configure the encoder one-to-one, position at 0, ignore errors */
972 	sd_sel.r.width = geo.output.width;
973 	sd_sel.r.height = geo.output.height;
974 	/*
975 	 * We first issue a S_SELECTION, so that the subsequent S_FMT delivers the
976 	 * final encoder configuration.
977 	 */
978 	v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, pad,
979 				   set_selection, NULL, &sd_sel);
980 	format.format.width = geo.output.width;
981 	format.format.height = geo.output.height;
982 	ret = v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, pad,
983 					 set_fmt, NULL, &format);
984 	/* Must be implemented, so, don't check for -ENOIOCTLCMD */
985 	if (ret < 0)
986 		return ret;
987 
988 	/* Sanity checks */
989 	if ((unsigned)format.format.width > VOU_MAX_IMAGE_WIDTH ||
990 	    (unsigned)format.format.height > img_height_max ||
991 	    format.format.code != MEDIA_BUS_FMT_YUYV8_2X8)
992 		return -EIO;
993 
994 	geo.output.width = format.format.width;
995 	geo.output.height = format.format.height;
996 
997 	/*
998 	 * No down-scaling. According to the API, current call has precedence:
999 	 * https://linuxtv.org/downloads/v4l-dvb-apis/uapi/v4l/crop.html#cropping-structures
1000 	 */
1001 	vou_adjust_input(&geo, vou_dev->std);
1002 
1003 	/* We tried to preserve output rectangle, but it could have changed */
1004 	vou_dev->rect = geo.output;
1005 	pix->width = geo.in_width;
1006 	pix->height = geo.in_height;
1007 
1008 	sh_vou_configure_geometry(vou_dev, vou_dev->pix_idx,
1009 				  geo.scale_idx_h, geo.scale_idx_v);
1010 
1011 	return 0;
1012 }
1013 
1014 static irqreturn_t sh_vou_isr(int irq, void *dev_id)
1015 {
1016 	struct sh_vou_device *vou_dev = dev_id;
1017 	static unsigned long j;
1018 	struct sh_vou_buffer *vb;
1019 	static int cnt;
1020 	u32 irq_status = sh_vou_reg_a_read(vou_dev, VOUIR), masked;
1021 	u32 vou_status = sh_vou_reg_a_read(vou_dev, VOUSTR);
1022 
1023 	if (!(irq_status & 0x300)) {
1024 		if (printk_timed_ratelimit(&j, 500))
1025 			dev_warn(vou_dev->v4l2_dev.dev, "IRQ status 0x%x!\n",
1026 				 irq_status);
1027 		return IRQ_NONE;
1028 	}
1029 
1030 	spin_lock(&vou_dev->lock);
1031 	if (!vou_dev->active || list_empty(&vou_dev->buf_list)) {
1032 		if (printk_timed_ratelimit(&j, 500))
1033 			dev_warn(vou_dev->v4l2_dev.dev,
1034 				 "IRQ without active buffer: %x!\n", irq_status);
1035 		/* Just ack: buf_release will disable further interrupts */
1036 		sh_vou_reg_a_set(vou_dev, VOUIR, 0, 0x300);
1037 		spin_unlock(&vou_dev->lock);
1038 		return IRQ_HANDLED;
1039 	}
1040 
1041 	masked = ~(0x300 & irq_status) & irq_status & 0x30304;
1042 	dev_dbg(vou_dev->v4l2_dev.dev,
1043 		"IRQ status 0x%x -> 0x%x, VOU status 0x%x, cnt %d\n",
1044 		irq_status, masked, vou_status, cnt);
1045 
1046 	cnt++;
1047 	/* side = vou_status & 0x10000; */
1048 
1049 	/* Clear only set interrupts */
1050 	sh_vou_reg_a_write(vou_dev, VOUIR, masked);
1051 
1052 	vb = vou_dev->active;
1053 	if (list_is_singular(&vb->list)) {
1054 		/* Keep cycling while no next buffer is available */
1055 		sh_vou_schedule_next(vou_dev, &vb->vb);
1056 		spin_unlock(&vou_dev->lock);
1057 		return IRQ_HANDLED;
1058 	}
1059 
1060 	list_del(&vb->list);
1061 
1062 	vb->vb.vb2_buf.timestamp = ktime_get_ns();
1063 	vb->vb.sequence = vou_dev->sequence++;
1064 	vb->vb.field = V4L2_FIELD_INTERLACED;
1065 	vb2_buffer_done(&vb->vb.vb2_buf, VB2_BUF_STATE_DONE);
1066 
1067 	vou_dev->active = list_entry(vou_dev->buf_list.next,
1068 				     struct sh_vou_buffer, list);
1069 
1070 	if (list_is_singular(&vou_dev->buf_list)) {
1071 		/* Keep cycling while no next buffer is available */
1072 		sh_vou_schedule_next(vou_dev, &vou_dev->active->vb);
1073 	} else {
1074 		struct sh_vou_buffer *new = list_entry(vou_dev->active->list.next,
1075 						struct sh_vou_buffer, list);
1076 		sh_vou_schedule_next(vou_dev, &new->vb);
1077 	}
1078 
1079 	spin_unlock(&vou_dev->lock);
1080 
1081 	return IRQ_HANDLED;
1082 }
1083 
1084 static int sh_vou_hw_init(struct sh_vou_device *vou_dev)
1085 {
1086 	struct sh_vou_pdata *pdata = vou_dev->pdata;
1087 	u32 voucr = sh_vou_ntsc_mode(pdata->bus_fmt) << 29;
1088 	int i = 100;
1089 
1090 	/* Disable all IRQs */
1091 	sh_vou_reg_a_write(vou_dev, VOUIR, 0);
1092 
1093 	/* Reset VOU interfaces - registers unaffected */
1094 	sh_vou_reg_a_write(vou_dev, VOUSRR, 0x101);
1095 	while (--i && (sh_vou_reg_a_read(vou_dev, VOUSRR) & 0x101))
1096 		udelay(1);
1097 
1098 	if (!i)
1099 		return -ETIMEDOUT;
1100 
1101 	dev_dbg(vou_dev->v4l2_dev.dev, "Reset took %dus\n", 100 - i);
1102 
1103 	if (pdata->flags & SH_VOU_PCLK_FALLING)
1104 		voucr |= 1 << 28;
1105 	if (pdata->flags & SH_VOU_HSYNC_LOW)
1106 		voucr |= 1 << 27;
1107 	if (pdata->flags & SH_VOU_VSYNC_LOW)
1108 		voucr |= 1 << 26;
1109 	sh_vou_reg_ab_set(vou_dev, VOUCR, voucr, 0xfc000000);
1110 
1111 	/* Manual register side switching at first */
1112 	sh_vou_reg_a_write(vou_dev, VOURCR, 4);
1113 	/* Default - fixed HSYNC length, can be made configurable is required */
1114 	sh_vou_reg_ab_write(vou_dev, VOUMSR, 0x800000);
1115 
1116 	sh_vou_set_fmt_vid_out(vou_dev, &vou_dev->pix);
1117 
1118 	return 0;
1119 }
1120 
1121 /* File operations */
1122 static int sh_vou_open(struct file *file)
1123 {
1124 	struct sh_vou_device *vou_dev = video_drvdata(file);
1125 	int err;
1126 
1127 	if (mutex_lock_interruptible(&vou_dev->fop_lock))
1128 		return -ERESTARTSYS;
1129 
1130 	err = v4l2_fh_open(file);
1131 	if (err)
1132 		goto done_open;
1133 	if (v4l2_fh_is_singular_file(file) &&
1134 	    vou_dev->status == SH_VOU_INITIALISING) {
1135 		/* First open */
1136 		err = pm_runtime_resume_and_get(vou_dev->v4l2_dev.dev);
1137 		if (err < 0) {
1138 			v4l2_fh_release(file);
1139 			goto done_open;
1140 		}
1141 		err = sh_vou_hw_init(vou_dev);
1142 		if (err < 0) {
1143 			pm_runtime_put(vou_dev->v4l2_dev.dev);
1144 			v4l2_fh_release(file);
1145 		} else {
1146 			vou_dev->status = SH_VOU_IDLE;
1147 		}
1148 	}
1149 done_open:
1150 	mutex_unlock(&vou_dev->fop_lock);
1151 	return err;
1152 }
1153 
1154 static int sh_vou_release(struct file *file)
1155 {
1156 	struct sh_vou_device *vou_dev = video_drvdata(file);
1157 	bool is_last;
1158 
1159 	mutex_lock(&vou_dev->fop_lock);
1160 	is_last = v4l2_fh_is_singular_file(file);
1161 	_vb2_fop_release(file, NULL);
1162 	if (is_last) {
1163 		/* Last close */
1164 		vou_dev->status = SH_VOU_INITIALISING;
1165 		sh_vou_reg_a_set(vou_dev, VOUER, 0, 0x101);
1166 		pm_runtime_put(vou_dev->v4l2_dev.dev);
1167 	}
1168 	mutex_unlock(&vou_dev->fop_lock);
1169 	return 0;
1170 }
1171 
1172 /* sh_vou display ioctl operations */
1173 static const struct v4l2_ioctl_ops sh_vou_ioctl_ops = {
1174 	.vidioc_querycap		= sh_vou_querycap,
1175 	.vidioc_enum_fmt_vid_out	= sh_vou_enum_fmt_vid_out,
1176 	.vidioc_g_fmt_vid_out		= sh_vou_g_fmt_vid_out,
1177 	.vidioc_s_fmt_vid_out		= sh_vou_s_fmt_vid_out,
1178 	.vidioc_try_fmt_vid_out		= sh_vou_try_fmt_vid_out,
1179 	.vidioc_reqbufs			= vb2_ioctl_reqbufs,
1180 	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
1181 	.vidioc_querybuf		= vb2_ioctl_querybuf,
1182 	.vidioc_qbuf			= vb2_ioctl_qbuf,
1183 	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
1184 	.vidioc_prepare_buf		= vb2_ioctl_prepare_buf,
1185 	.vidioc_streamon		= vb2_ioctl_streamon,
1186 	.vidioc_streamoff		= vb2_ioctl_streamoff,
1187 	.vidioc_expbuf			= vb2_ioctl_expbuf,
1188 	.vidioc_g_output		= sh_vou_g_output,
1189 	.vidioc_s_output		= sh_vou_s_output,
1190 	.vidioc_enum_output		= sh_vou_enum_output,
1191 	.vidioc_s_std			= sh_vou_s_std,
1192 	.vidioc_g_std			= sh_vou_g_std,
1193 	.vidioc_g_selection		= sh_vou_g_selection,
1194 	.vidioc_s_selection		= sh_vou_s_selection,
1195 	.vidioc_log_status		= sh_vou_log_status,
1196 };
1197 
1198 static const struct v4l2_file_operations sh_vou_fops = {
1199 	.owner		= THIS_MODULE,
1200 	.open		= sh_vou_open,
1201 	.release	= sh_vou_release,
1202 	.unlocked_ioctl	= video_ioctl2,
1203 	.mmap		= vb2_fop_mmap,
1204 	.poll		= vb2_fop_poll,
1205 	.write		= vb2_fop_write,
1206 };
1207 
1208 static const struct video_device sh_vou_video_template = {
1209 	.name		= "sh_vou",
1210 	.fops		= &sh_vou_fops,
1211 	.ioctl_ops	= &sh_vou_ioctl_ops,
1212 	.tvnorms	= V4L2_STD_525_60, /* PAL only supported in 8-bit non-bt656 mode */
1213 	.vfl_dir	= VFL_DIR_TX,
1214 	.device_caps	= V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_READWRITE |
1215 			  V4L2_CAP_STREAMING,
1216 };
1217 
1218 static int sh_vou_probe(struct platform_device *pdev)
1219 {
1220 	struct sh_vou_pdata *vou_pdata = pdev->dev.platform_data;
1221 	struct v4l2_rect *rect;
1222 	struct v4l2_pix_format *pix;
1223 	struct i2c_adapter *i2c_adap;
1224 	struct video_device *vdev;
1225 	struct sh_vou_device *vou_dev;
1226 	struct resource *reg_res;
1227 	struct v4l2_subdev *subdev;
1228 	struct vb2_queue *q;
1229 	int irq, ret;
1230 
1231 	reg_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1232 	irq = platform_get_irq(pdev, 0);
1233 
1234 	if (!vou_pdata || !reg_res || irq <= 0) {
1235 		dev_err(&pdev->dev, "Insufficient VOU platform information.\n");
1236 		return -ENODEV;
1237 	}
1238 
1239 	vou_dev = devm_kzalloc(&pdev->dev, sizeof(*vou_dev), GFP_KERNEL);
1240 	if (!vou_dev)
1241 		return -ENOMEM;
1242 
1243 	INIT_LIST_HEAD(&vou_dev->buf_list);
1244 	spin_lock_init(&vou_dev->lock);
1245 	mutex_init(&vou_dev->fop_lock);
1246 	vou_dev->pdata = vou_pdata;
1247 	vou_dev->status = SH_VOU_INITIALISING;
1248 	vou_dev->pix_idx = 1;
1249 
1250 	rect = &vou_dev->rect;
1251 	pix = &vou_dev->pix;
1252 
1253 	/* Fill in defaults */
1254 	vou_dev->std		= V4L2_STD_NTSC_M;
1255 	rect->left		= 0;
1256 	rect->top		= 0;
1257 	rect->width		= VOU_MAX_IMAGE_WIDTH;
1258 	rect->height		= 480;
1259 	pix->width		= VOU_MAX_IMAGE_WIDTH;
1260 	pix->height		= 480;
1261 	pix->pixelformat	= V4L2_PIX_FMT_NV16;
1262 	pix->field		= V4L2_FIELD_INTERLACED;
1263 	pix->bytesperline	= VOU_MAX_IMAGE_WIDTH;
1264 	pix->sizeimage		= VOU_MAX_IMAGE_WIDTH * 2 * 480;
1265 	pix->colorspace		= V4L2_COLORSPACE_SMPTE170M;
1266 
1267 	vou_dev->base = devm_ioremap_resource(&pdev->dev, reg_res);
1268 	if (IS_ERR(vou_dev->base))
1269 		return PTR_ERR(vou_dev->base);
1270 
1271 	ret = devm_request_irq(&pdev->dev, irq, sh_vou_isr, 0, "vou", vou_dev);
1272 	if (ret < 0)
1273 		return ret;
1274 
1275 	ret = v4l2_device_register(&pdev->dev, &vou_dev->v4l2_dev);
1276 	if (ret < 0) {
1277 		dev_err(&pdev->dev, "Error registering v4l2 device\n");
1278 		return ret;
1279 	}
1280 
1281 	vdev = &vou_dev->vdev;
1282 	*vdev = sh_vou_video_template;
1283 	if (vou_pdata->bus_fmt == SH_VOU_BUS_8BIT)
1284 		vdev->tvnorms |= V4L2_STD_PAL;
1285 	vdev->v4l2_dev = &vou_dev->v4l2_dev;
1286 	vdev->release = video_device_release_empty;
1287 	vdev->lock = &vou_dev->fop_lock;
1288 
1289 	video_set_drvdata(vdev, vou_dev);
1290 
1291 	/* Initialize the vb2 queue */
1292 	q = &vou_dev->queue;
1293 	q->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
1294 	q->io_modes = VB2_MMAP | VB2_DMABUF | VB2_WRITE;
1295 	q->drv_priv = vou_dev;
1296 	q->buf_struct_size = sizeof(struct sh_vou_buffer);
1297 	q->ops = &sh_vou_qops;
1298 	q->mem_ops = &vb2_dma_contig_memops;
1299 	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1300 	q->min_buffers_needed = 2;
1301 	q->lock = &vou_dev->fop_lock;
1302 	q->dev = &pdev->dev;
1303 	ret = vb2_queue_init(q);
1304 	if (ret)
1305 		goto ei2cgadap;
1306 
1307 	vdev->queue = q;
1308 	INIT_LIST_HEAD(&vou_dev->buf_list);
1309 
1310 	pm_runtime_enable(&pdev->dev);
1311 	pm_runtime_resume(&pdev->dev);
1312 
1313 	i2c_adap = i2c_get_adapter(vou_pdata->i2c_adap);
1314 	if (!i2c_adap) {
1315 		ret = -ENODEV;
1316 		goto ei2cgadap;
1317 	}
1318 
1319 	ret = sh_vou_hw_init(vou_dev);
1320 	if (ret < 0)
1321 		goto ereset;
1322 
1323 	subdev = v4l2_i2c_new_subdev_board(&vou_dev->v4l2_dev, i2c_adap,
1324 			vou_pdata->board_info, NULL);
1325 	if (!subdev) {
1326 		ret = -ENOMEM;
1327 		goto ei2cnd;
1328 	}
1329 
1330 	ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
1331 	if (ret < 0)
1332 		goto evregdev;
1333 
1334 	return 0;
1335 
1336 evregdev:
1337 ei2cnd:
1338 ereset:
1339 	i2c_put_adapter(i2c_adap);
1340 ei2cgadap:
1341 	pm_runtime_disable(&pdev->dev);
1342 	v4l2_device_unregister(&vou_dev->v4l2_dev);
1343 	return ret;
1344 }
1345 
1346 static void sh_vou_remove(struct platform_device *pdev)
1347 {
1348 	struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
1349 	struct sh_vou_device *vou_dev = container_of(v4l2_dev,
1350 						struct sh_vou_device, v4l2_dev);
1351 	struct v4l2_subdev *sd = list_entry(v4l2_dev->subdevs.next,
1352 					    struct v4l2_subdev, list);
1353 	struct i2c_client *client = v4l2_get_subdevdata(sd);
1354 
1355 	pm_runtime_disable(&pdev->dev);
1356 	video_unregister_device(&vou_dev->vdev);
1357 	i2c_put_adapter(client->adapter);
1358 	v4l2_device_unregister(&vou_dev->v4l2_dev);
1359 }
1360 
1361 static struct platform_driver sh_vou = {
1362 	.remove_new = sh_vou_remove,
1363 	.driver  = {
1364 		.name	= "sh-vou",
1365 	},
1366 };
1367 
1368 module_platform_driver_probe(sh_vou, sh_vou_probe);
1369 
1370 MODULE_DESCRIPTION("SuperH VOU driver");
1371 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
1372 MODULE_LICENSE("GPL v2");
1373 MODULE_VERSION("0.1.0");
1374 MODULE_ALIAS("platform:sh-vou");
1375