1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * This is the driver for the STA2x11 Video Input Port.
4  *
5  * Copyright (C) 2012       ST Microelectronics
6  *     author: Federico Vaga <federico.vaga@gmail.com>
7  * Copyright (C) 2010       WindRiver Systems, Inc.
8  *     authors: Andreas Kies <andreas.kies@windriver.com>
9  *              Vlad Lungu   <vlad.lungu@windriver.com>
10  */
11 
12 #include <linux/types.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/videodev2.h>
17 #include <linux/kmod.h>
18 #include <linux/pci.h>
19 #include <linux/interrupt.h>
20 #include <linux/io.h>
21 #include <linux/gpio/consumer.h>
22 #include <linux/gpio.h>
23 #include <linux/i2c.h>
24 #include <linux/delay.h>
25 #include <media/v4l2-common.h>
26 #include <media/v4l2-device.h>
27 #include <media/v4l2-ctrls.h>
28 #include <media/v4l2-ioctl.h>
29 #include <media/v4l2-fh.h>
30 #include <media/v4l2-event.h>
31 #include <media/videobuf2-dma-contig.h>
32 
33 #include "sta2x11_vip.h"
34 
35 #define DRV_VERSION "1.3"
36 
37 #ifndef PCI_DEVICE_ID_STMICRO_VIP
38 #define PCI_DEVICE_ID_STMICRO_VIP 0xCC0D
39 #endif
40 
41 #define MAX_FRAMES 4
42 
43 /*Register offsets*/
44 #define DVP_CTL		0x00
45 #define DVP_TFO		0x04
46 #define DVP_TFS		0x08
47 #define DVP_BFO		0x0C
48 #define DVP_BFS		0x10
49 #define DVP_VTP		0x14
50 #define DVP_VBP		0x18
51 #define DVP_VMP		0x1C
52 #define DVP_ITM		0x98
53 #define DVP_ITS		0x9C
54 #define DVP_STA		0xA0
55 #define DVP_HLFLN	0xA8
56 #define DVP_RGB		0xC0
57 #define DVP_PKZ		0xF0
58 
59 /*Register fields*/
60 #define DVP_CTL_ENA	0x00000001
61 #define DVP_CTL_RST	0x80000000
62 #define DVP_CTL_DIS	(~0x00040001)
63 
64 #define DVP_IT_VSB	0x00000008
65 #define DVP_IT_VST	0x00000010
66 #define DVP_IT_FIFO	0x00000020
67 
68 #define DVP_HLFLN_SD	0x00000001
69 
70 #define SAVE_COUNT 8
71 #define AUX_COUNT 3
72 #define IRQ_COUNT 1
73 
74 
75 struct vip_buffer {
76 	struct vb2_v4l2_buffer vb;
77 	struct list_head	list;
78 	dma_addr_t		dma;
79 };
80 static inline struct vip_buffer *to_vip_buffer(struct vb2_v4l2_buffer *vb2)
81 {
82 	return container_of(vb2, struct vip_buffer, vb);
83 }
84 
85 /**
86  * struct sta2x11_vip - All internal data for one instance of device
87  * @v4l2_dev: device registered in v4l layer
88  * @video_dev: properties of our device
89  * @pdev: PCI device
90  * @adapter: contains I2C adapter information
91  * @register_save_area: All relevant register are saved here during suspend
92  * @decoder: contains information about video DAC
93  * @ctrl_hdl: handler for control framework
94  * @format: pixel format, fixed UYVY
95  * @std: video standard (e.g. PAL/NTSC)
96  * @input: input line for video signal ( 0 or 1 )
97  * @disabled: Device is in power down state
98  * @slock: for excluse access of registers
99  * @vb_vidq: queue maintained by videobuf2 layer
100  * @buffer_list: list of buffer in use
101  * @sequence: sequence number of acquired buffer
102  * @active: current active buffer
103  * @lock: used in videobuf2 callback
104  * @v4l_lock: serialize its video4linux ioctls
105  * @tcount: Number of top frames
106  * @bcount: Number of bottom frames
107  * @overflow: Number of FIFO overflows
108  * @iomem: hardware base address
109  * @config: I2C and gpio config from platform
110  *
111  * All non-local data is accessed via this structure.
112  */
113 struct sta2x11_vip {
114 	struct v4l2_device v4l2_dev;
115 	struct video_device video_dev;
116 	struct pci_dev *pdev;
117 	struct i2c_adapter *adapter;
118 	unsigned int register_save_area[IRQ_COUNT + SAVE_COUNT + AUX_COUNT];
119 	struct v4l2_subdev *decoder;
120 	struct v4l2_ctrl_handler ctrl_hdl;
121 
122 
123 	struct v4l2_pix_format format;
124 	v4l2_std_id std;
125 	unsigned int input;
126 	int disabled;
127 	spinlock_t slock;
128 
129 	struct vb2_queue vb_vidq;
130 	struct list_head buffer_list;
131 	unsigned int sequence;
132 	struct vip_buffer *active; /* current active buffer */
133 	spinlock_t lock; /* Used in videobuf2 callback */
134 	struct mutex v4l_lock;
135 
136 	/* Interrupt counters */
137 	int tcount, bcount;
138 	int overflow;
139 
140 	void __iomem *iomem;	/* I/O Memory */
141 	struct vip_config *config;
142 };
143 
144 static const unsigned int registers_to_save[AUX_COUNT] = {
145 	DVP_HLFLN, DVP_RGB, DVP_PKZ
146 };
147 
148 static struct v4l2_pix_format formats_50[] = {
149 	{			/*PAL interlaced */
150 	 .width = 720,
151 	 .height = 576,
152 	 .pixelformat = V4L2_PIX_FMT_UYVY,
153 	 .field = V4L2_FIELD_INTERLACED,
154 	 .bytesperline = 720 * 2,
155 	 .sizeimage = 720 * 2 * 576,
156 	 .colorspace = V4L2_COLORSPACE_SMPTE170M},
157 	{			/*PAL top */
158 	 .width = 720,
159 	 .height = 288,
160 	 .pixelformat = V4L2_PIX_FMT_UYVY,
161 	 .field = V4L2_FIELD_TOP,
162 	 .bytesperline = 720 * 2,
163 	 .sizeimage = 720 * 2 * 288,
164 	 .colorspace = V4L2_COLORSPACE_SMPTE170M},
165 	{			/*PAL bottom */
166 	 .width = 720,
167 	 .height = 288,
168 	 .pixelformat = V4L2_PIX_FMT_UYVY,
169 	 .field = V4L2_FIELD_BOTTOM,
170 	 .bytesperline = 720 * 2,
171 	 .sizeimage = 720 * 2 * 288,
172 	 .colorspace = V4L2_COLORSPACE_SMPTE170M},
173 
174 };
175 
176 static struct v4l2_pix_format formats_60[] = {
177 	{			/*NTSC interlaced */
178 	 .width = 720,
179 	 .height = 480,
180 	 .pixelformat = V4L2_PIX_FMT_UYVY,
181 	 .field = V4L2_FIELD_INTERLACED,
182 	 .bytesperline = 720 * 2,
183 	 .sizeimage = 720 * 2 * 480,
184 	 .colorspace = V4L2_COLORSPACE_SMPTE170M},
185 	{			/*NTSC top */
186 	 .width = 720,
187 	 .height = 240,
188 	 .pixelformat = V4L2_PIX_FMT_UYVY,
189 	 .field = V4L2_FIELD_TOP,
190 	 .bytesperline = 720 * 2,
191 	 .sizeimage = 720 * 2 * 240,
192 	 .colorspace = V4L2_COLORSPACE_SMPTE170M},
193 	{			/*NTSC bottom */
194 	 .width = 720,
195 	 .height = 240,
196 	 .pixelformat = V4L2_PIX_FMT_UYVY,
197 	 .field = V4L2_FIELD_BOTTOM,
198 	 .bytesperline = 720 * 2,
199 	 .sizeimage = 720 * 2 * 240,
200 	 .colorspace = V4L2_COLORSPACE_SMPTE170M},
201 };
202 
203 /* Write VIP register */
204 static inline void reg_write(struct sta2x11_vip *vip, unsigned int reg, u32 val)
205 {
206 	iowrite32((val), (vip->iomem)+(reg));
207 }
208 /* Read VIP register */
209 static inline u32 reg_read(struct sta2x11_vip *vip, unsigned int reg)
210 {
211 	return  ioread32((vip->iomem)+(reg));
212 }
213 /* Start DMA acquisition */
214 static void start_dma(struct sta2x11_vip *vip, struct vip_buffer *vip_buf)
215 {
216 	unsigned long offset = 0;
217 
218 	if (vip->format.field == V4L2_FIELD_INTERLACED)
219 		offset = vip->format.width * 2;
220 
221 	spin_lock_irq(&vip->slock);
222 	/* Enable acquisition */
223 	reg_write(vip, DVP_CTL, reg_read(vip, DVP_CTL) | DVP_CTL_ENA);
224 	/* Set Top and Bottom Field memory address */
225 	reg_write(vip, DVP_VTP, (u32)vip_buf->dma);
226 	reg_write(vip, DVP_VBP, (u32)vip_buf->dma + offset);
227 	spin_unlock_irq(&vip->slock);
228 }
229 
230 /* Fetch the next buffer to activate */
231 static void vip_active_buf_next(struct sta2x11_vip *vip)
232 {
233 	/* Get the next buffer */
234 	spin_lock(&vip->lock);
235 	if (list_empty(&vip->buffer_list)) {/* No available buffer */
236 		spin_unlock(&vip->lock);
237 		return;
238 	}
239 	vip->active = list_first_entry(&vip->buffer_list,
240 				       struct vip_buffer,
241 				       list);
242 	/* Reset Top and Bottom counter */
243 	vip->tcount = 0;
244 	vip->bcount = 0;
245 	spin_unlock(&vip->lock);
246 	if (vb2_is_streaming(&vip->vb_vidq)) {	/* streaming is on */
247 		start_dma(vip, vip->active);	/* start dma capture */
248 	}
249 }
250 
251 
252 /* Videobuf2 Operations */
253 static int queue_setup(struct vb2_queue *vq,
254 		       unsigned int *nbuffers, unsigned int *nplanes,
255 		       unsigned int sizes[], struct device *alloc_devs[])
256 {
257 	struct sta2x11_vip *vip = vb2_get_drv_priv(vq);
258 
259 	if (!(*nbuffers) || *nbuffers < MAX_FRAMES)
260 		*nbuffers = MAX_FRAMES;
261 
262 	*nplanes = 1;
263 	sizes[0] = vip->format.sizeimage;
264 
265 	vip->sequence = 0;
266 	vip->active = NULL;
267 	vip->tcount = 0;
268 	vip->bcount = 0;
269 
270 	return 0;
271 };
272 static int buffer_init(struct vb2_buffer *vb)
273 {
274 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
275 	struct vip_buffer *vip_buf = to_vip_buffer(vbuf);
276 
277 	vip_buf->dma = vb2_dma_contig_plane_dma_addr(vb, 0);
278 	INIT_LIST_HEAD(&vip_buf->list);
279 	return 0;
280 }
281 
282 static int buffer_prepare(struct vb2_buffer *vb)
283 {
284 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
285 	struct sta2x11_vip *vip = vb2_get_drv_priv(vb->vb2_queue);
286 	struct vip_buffer *vip_buf = to_vip_buffer(vbuf);
287 	unsigned long size;
288 
289 	size = vip->format.sizeimage;
290 	if (vb2_plane_size(vb, 0) < size) {
291 		v4l2_err(&vip->v4l2_dev, "buffer too small (%lu < %lu)\n",
292 			 vb2_plane_size(vb, 0), size);
293 		return -EINVAL;
294 	}
295 
296 	vb2_set_plane_payload(&vip_buf->vb.vb2_buf, 0, size);
297 
298 	return 0;
299 }
300 static void buffer_queue(struct vb2_buffer *vb)
301 {
302 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
303 	struct sta2x11_vip *vip = vb2_get_drv_priv(vb->vb2_queue);
304 	struct vip_buffer *vip_buf = to_vip_buffer(vbuf);
305 
306 	spin_lock(&vip->lock);
307 	list_add_tail(&vip_buf->list, &vip->buffer_list);
308 	if (!vip->active) {	/* No active buffer, active the first one */
309 		vip->active = list_first_entry(&vip->buffer_list,
310 					       struct vip_buffer,
311 					       list);
312 		if (vb2_is_streaming(&vip->vb_vidq))	/* streaming is on */
313 			start_dma(vip, vip_buf);	/* start dma capture */
314 	}
315 	spin_unlock(&vip->lock);
316 }
317 static void buffer_finish(struct vb2_buffer *vb)
318 {
319 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
320 	struct sta2x11_vip *vip = vb2_get_drv_priv(vb->vb2_queue);
321 	struct vip_buffer *vip_buf = to_vip_buffer(vbuf);
322 
323 	/* Buffer handled, remove it from the list */
324 	spin_lock(&vip->lock);
325 	list_del_init(&vip_buf->list);
326 	spin_unlock(&vip->lock);
327 
328 	if (vb2_is_streaming(vb->vb2_queue))
329 		vip_active_buf_next(vip);
330 }
331 
332 static int start_streaming(struct vb2_queue *vq, unsigned int count)
333 {
334 	struct sta2x11_vip *vip = vb2_get_drv_priv(vq);
335 
336 	spin_lock_irq(&vip->slock);
337 	/* Enable interrupt VSYNC Top and Bottom*/
338 	reg_write(vip, DVP_ITM, DVP_IT_VSB | DVP_IT_VST);
339 	spin_unlock_irq(&vip->slock);
340 
341 	if (count)
342 		start_dma(vip, vip->active);
343 
344 	return 0;
345 }
346 
347 /* abort streaming and wait for last buffer */
348 static void stop_streaming(struct vb2_queue *vq)
349 {
350 	struct sta2x11_vip *vip = vb2_get_drv_priv(vq);
351 	struct vip_buffer *vip_buf, *node;
352 
353 	/* Disable acquisition */
354 	reg_write(vip, DVP_CTL, reg_read(vip, DVP_CTL) & ~DVP_CTL_ENA);
355 	/* Disable all interrupts */
356 	reg_write(vip, DVP_ITM, 0);
357 
358 	/* Release all active buffers */
359 	spin_lock(&vip->lock);
360 	list_for_each_entry_safe(vip_buf, node, &vip->buffer_list, list) {
361 		vb2_buffer_done(&vip_buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
362 		list_del(&vip_buf->list);
363 	}
364 	spin_unlock(&vip->lock);
365 }
366 
367 static const struct vb2_ops vip_video_qops = {
368 	.queue_setup		= queue_setup,
369 	.buf_init		= buffer_init,
370 	.buf_prepare		= buffer_prepare,
371 	.buf_finish		= buffer_finish,
372 	.buf_queue		= buffer_queue,
373 	.start_streaming	= start_streaming,
374 	.stop_streaming		= stop_streaming,
375 	.wait_prepare		= vb2_ops_wait_prepare,
376 	.wait_finish		= vb2_ops_wait_finish,
377 };
378 
379 
380 /* File Operations */
381 static const struct v4l2_file_operations vip_fops = {
382 	.owner = THIS_MODULE,
383 	.open = v4l2_fh_open,
384 	.release = vb2_fop_release,
385 	.unlocked_ioctl = video_ioctl2,
386 	.read = vb2_fop_read,
387 	.mmap = vb2_fop_mmap,
388 	.poll = vb2_fop_poll
389 };
390 
391 
392 /**
393  * vidioc_querycap - return capabilities of device
394  * @file: descriptor of device
395  * @cap: contains return values
396  * @priv: unused
397  *
398  * the capabilities of the device are returned
399  *
400  * return value: 0, no error.
401  */
402 static int vidioc_querycap(struct file *file, void *priv,
403 			   struct v4l2_capability *cap)
404 {
405 	strscpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver));
406 	strscpy(cap->card, KBUILD_MODNAME, sizeof(cap->card));
407 	return 0;
408 }
409 
410 /**
411  * vidioc_s_std - set video standard
412  * @file: descriptor of device
413  * @std: contains standard to be set
414  * @priv: unused
415  *
416  * the video standard is set
417  *
418  * return value: 0, no error.
419  *
420  * -EIO, no input signal detected
421  *
422  * other, returned from video DAC.
423  */
424 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id std)
425 {
426 	struct sta2x11_vip *vip = video_drvdata(file);
427 
428 	/*
429 	 * This is here for backwards compatibility only.
430 	 * The use of V4L2_STD_ALL to trigger a querystd is non-standard.
431 	 */
432 	if (std == V4L2_STD_ALL) {
433 		v4l2_subdev_call(vip->decoder, video, querystd, &std);
434 		if (std == V4L2_STD_UNKNOWN)
435 			return -EIO;
436 	}
437 
438 	if (vip->std != std) {
439 		vip->std = std;
440 		if (V4L2_STD_525_60 & std)
441 			vip->format = formats_60[0];
442 		else
443 			vip->format = formats_50[0];
444 	}
445 
446 	return v4l2_subdev_call(vip->decoder, video, s_std, std);
447 }
448 
449 /**
450  * vidioc_g_std - get video standard
451  * @file: descriptor of device
452  * @priv: unused
453  * @std: contains return values
454  *
455  * the current video standard is returned
456  *
457  * return value: 0, no error.
458  */
459 static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *std)
460 {
461 	struct sta2x11_vip *vip = video_drvdata(file);
462 
463 	*std = vip->std;
464 	return 0;
465 }
466 
467 /**
468  * vidioc_querystd - get possible video standards
469  * @file: descriptor of device
470  * @priv: unused
471  * @std: contains return values
472  *
473  * all possible video standards are returned
474  *
475  * return value: delivered by video DAC routine.
476  */
477 static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *std)
478 {
479 	struct sta2x11_vip *vip = video_drvdata(file);
480 
481 	return v4l2_subdev_call(vip->decoder, video, querystd, std);
482 }
483 
484 static int vidioc_enum_input(struct file *file, void *priv,
485 			     struct v4l2_input *inp)
486 {
487 	if (inp->index > 1)
488 		return -EINVAL;
489 
490 	inp->type = V4L2_INPUT_TYPE_CAMERA;
491 	inp->std = V4L2_STD_ALL;
492 	sprintf(inp->name, "Camera %u", inp->index);
493 
494 	return 0;
495 }
496 
497 /**
498  * vidioc_s_input - set input line
499  * @file: descriptor of device
500  * @priv: unused
501  * @i: new input line number
502  *
503  * the current active input line is set
504  *
505  * return value: 0, no error.
506  *
507  * -EINVAL, line number out of range
508  */
509 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
510 {
511 	struct sta2x11_vip *vip = video_drvdata(file);
512 	int ret;
513 
514 	if (i > 1)
515 		return -EINVAL;
516 	ret = v4l2_subdev_call(vip->decoder, video, s_routing, i, 0, 0);
517 
518 	if (!ret)
519 		vip->input = i;
520 
521 	return 0;
522 }
523 
524 /**
525  * vidioc_g_input - return input line
526  * @file: descriptor of device
527  * @priv: unused
528  * @i: returned input line number
529  *
530  * the current active input line is returned
531  *
532  * return value: always 0.
533  */
534 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
535 {
536 	struct sta2x11_vip *vip = video_drvdata(file);
537 
538 	*i = vip->input;
539 	return 0;
540 }
541 
542 /**
543  * vidioc_enum_fmt_vid_cap - return video capture format
544  * @file: descriptor of device
545  * @priv: unused
546  * @f: returned format information
547  *
548  * returns name and format of video capture
549  * Only UYVY is supported by hardware.
550  *
551  * return value: always 0.
552  */
553 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
554 				   struct v4l2_fmtdesc *f)
555 {
556 
557 	if (f->index != 0)
558 		return -EINVAL;
559 
560 	f->pixelformat = V4L2_PIX_FMT_UYVY;
561 	return 0;
562 }
563 
564 /**
565  * vidioc_try_fmt_vid_cap - set video capture format
566  * @file: descriptor of device
567  * @priv: unused
568  * @f: new format
569  *
570  * new video format is set which includes width and
571  * field type. width is fixed to 720, no scaling.
572  * Only UYVY is supported by this hardware.
573  * the minimum height is 200, the maximum is 576 (PAL)
574  *
575  * return value: 0, no error
576  *
577  * -EINVAL, pixel or field format not supported
578  *
579  */
580 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
581 				  struct v4l2_format *f)
582 {
583 	struct sta2x11_vip *vip = video_drvdata(file);
584 	int interlace_lim;
585 
586 	if (V4L2_PIX_FMT_UYVY != f->fmt.pix.pixelformat) {
587 		v4l2_warn(&vip->v4l2_dev, "Invalid format, only UYVY supported\n");
588 		return -EINVAL;
589 	}
590 
591 	if (V4L2_STD_525_60 & vip->std)
592 		interlace_lim = 240;
593 	else
594 		interlace_lim = 288;
595 
596 	switch (f->fmt.pix.field) {
597 	default:
598 	case V4L2_FIELD_ANY:
599 		if (interlace_lim < f->fmt.pix.height)
600 			f->fmt.pix.field = V4L2_FIELD_INTERLACED;
601 		else
602 			f->fmt.pix.field = V4L2_FIELD_BOTTOM;
603 		break;
604 	case V4L2_FIELD_TOP:
605 	case V4L2_FIELD_BOTTOM:
606 		if (interlace_lim < f->fmt.pix.height)
607 			f->fmt.pix.height = interlace_lim;
608 		break;
609 	case V4L2_FIELD_INTERLACED:
610 		break;
611 	}
612 
613 	/* It is the only supported format */
614 	f->fmt.pix.pixelformat = V4L2_PIX_FMT_UYVY;
615 	f->fmt.pix.height &= ~1;
616 	if (2 * interlace_lim < f->fmt.pix.height)
617 		f->fmt.pix.height = 2 * interlace_lim;
618 	if (200 > f->fmt.pix.height)
619 		f->fmt.pix.height = 200;
620 	f->fmt.pix.width = 720;
621 	f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
622 	f->fmt.pix.sizeimage = f->fmt.pix.width * 2 * f->fmt.pix.height;
623 	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
624 	return 0;
625 }
626 
627 /**
628  * vidioc_s_fmt_vid_cap - set current video format parameters
629  * @file: descriptor of device
630  * @priv: unused
631  * @f: returned format information
632  *
633  * set new capture format
634  * return value: 0, no error
635  *
636  * other, delivered by video DAC routine.
637  */
638 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
639 				struct v4l2_format *f)
640 {
641 	struct sta2x11_vip *vip = video_drvdata(file);
642 	unsigned int t_stop, b_stop, pitch;
643 	int ret;
644 
645 	ret = vidioc_try_fmt_vid_cap(file, priv, f);
646 	if (ret)
647 		return ret;
648 
649 	if (vb2_is_busy(&vip->vb_vidq)) {
650 		/* Can't change format during acquisition */
651 		v4l2_err(&vip->v4l2_dev, "device busy\n");
652 		return -EBUSY;
653 	}
654 	vip->format = f->fmt.pix;
655 	switch (vip->format.field) {
656 	case V4L2_FIELD_INTERLACED:
657 		t_stop = ((vip->format.height / 2 - 1) << 16) |
658 			 (2 * vip->format.width - 1);
659 		b_stop = t_stop;
660 		pitch = 4 * vip->format.width;
661 		break;
662 	case V4L2_FIELD_TOP:
663 		t_stop = ((vip->format.height - 1) << 16) |
664 			 (2 * vip->format.width - 1);
665 		b_stop = (0 << 16) | (2 * vip->format.width - 1);
666 		pitch = 2 * vip->format.width;
667 		break;
668 	case V4L2_FIELD_BOTTOM:
669 		t_stop = (0 << 16) | (2 * vip->format.width - 1);
670 		b_stop = (vip->format.height << 16) |
671 			 (2 * vip->format.width - 1);
672 		pitch = 2 * vip->format.width;
673 		break;
674 	default:
675 		v4l2_err(&vip->v4l2_dev, "unknown field format\n");
676 		return -EINVAL;
677 	}
678 
679 	spin_lock_irq(&vip->slock);
680 	/* Y-X Top Field Offset */
681 	reg_write(vip, DVP_TFO, 0);
682 	/* Y-X Bottom Field Offset */
683 	reg_write(vip, DVP_BFO, 0);
684 	/* Y-X Top Field Stop*/
685 	reg_write(vip, DVP_TFS, t_stop);
686 	/* Y-X Bottom Field Stop */
687 	reg_write(vip, DVP_BFS, b_stop);
688 	/* Video Memory Pitch */
689 	reg_write(vip, DVP_VMP, pitch);
690 	spin_unlock_irq(&vip->slock);
691 
692 	return 0;
693 }
694 
695 /**
696  * vidioc_g_fmt_vid_cap - get current video format parameters
697  * @file: descriptor of device
698  * @priv: unused
699  * @f: contains format information
700  *
701  * returns current video format parameters
702  *
703  * return value: 0, always successful
704  */
705 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
706 				struct v4l2_format *f)
707 {
708 	struct sta2x11_vip *vip = video_drvdata(file);
709 
710 	f->fmt.pix = vip->format;
711 
712 	return 0;
713 }
714 
715 static const struct v4l2_ioctl_ops vip_ioctl_ops = {
716 	.vidioc_querycap = vidioc_querycap,
717 	/* FMT handling */
718 	.vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
719 	.vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
720 	.vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
721 	.vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
722 	/* Buffer handlers */
723 	.vidioc_create_bufs = vb2_ioctl_create_bufs,
724 	.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
725 	.vidioc_reqbufs = vb2_ioctl_reqbufs,
726 	.vidioc_querybuf = vb2_ioctl_querybuf,
727 	.vidioc_qbuf = vb2_ioctl_qbuf,
728 	.vidioc_dqbuf = vb2_ioctl_dqbuf,
729 	/* Stream on/off */
730 	.vidioc_streamon = vb2_ioctl_streamon,
731 	.vidioc_streamoff = vb2_ioctl_streamoff,
732 	/* Standard handling */
733 	.vidioc_g_std = vidioc_g_std,
734 	.vidioc_s_std = vidioc_s_std,
735 	.vidioc_querystd = vidioc_querystd,
736 	/* Input handling */
737 	.vidioc_enum_input = vidioc_enum_input,
738 	.vidioc_g_input = vidioc_g_input,
739 	.vidioc_s_input = vidioc_s_input,
740 	/* Log status ioctl */
741 	.vidioc_log_status = v4l2_ctrl_log_status,
742 	/* Event handling */
743 	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
744 	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
745 };
746 
747 static const struct video_device video_dev_template = {
748 	.name = KBUILD_MODNAME,
749 	.release = video_device_release_empty,
750 	.fops = &vip_fops,
751 	.ioctl_ops = &vip_ioctl_ops,
752 	.tvnorms = V4L2_STD_ALL,
753 	.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE |
754 		       V4L2_CAP_STREAMING,
755 };
756 
757 /**
758  * vip_irq - interrupt routine
759  * @irq: Number of interrupt ( not used, correct number is assumed )
760  * @vip: local data structure containing all information
761  *
762  * check for both frame interrupts set ( top and bottom ).
763  * check FIFO overflow, but limit number of log messages after open.
764  * signal a complete buffer if done
765  *
766  * return value: IRQ_NONE, interrupt was not generated by VIP
767  *
768  * IRQ_HANDLED, interrupt done.
769  */
770 static irqreturn_t vip_irq(int irq, struct sta2x11_vip *vip)
771 {
772 	unsigned int status;
773 
774 	status = reg_read(vip, DVP_ITS);
775 
776 	if (!status)		/* No interrupt to handle */
777 		return IRQ_NONE;
778 
779 	if (status & DVP_IT_FIFO)
780 		if (vip->overflow++ > 5)
781 			pr_info("VIP: fifo overflow\n");
782 
783 	if ((status & DVP_IT_VST) && (status & DVP_IT_VSB)) {
784 		/* this is bad, we are too slow, hope the condition is gone
785 		 * on the next frame */
786 		return IRQ_HANDLED;
787 	}
788 
789 	if (status & DVP_IT_VST)
790 		if ((++vip->tcount) < 2)
791 			return IRQ_HANDLED;
792 	if (status & DVP_IT_VSB) {
793 		vip->bcount++;
794 		return IRQ_HANDLED;
795 	}
796 
797 	if (vip->active) { /* Acquisition is over on this buffer */
798 		/* Disable acquisition */
799 		reg_write(vip, DVP_CTL, reg_read(vip, DVP_CTL) & ~DVP_CTL_ENA);
800 		/* Remove the active buffer from the list */
801 		vip->active->vb.vb2_buf.timestamp = ktime_get_ns();
802 		vip->active->vb.sequence = vip->sequence++;
803 		vb2_buffer_done(&vip->active->vb.vb2_buf, VB2_BUF_STATE_DONE);
804 	}
805 
806 	return IRQ_HANDLED;
807 }
808 
809 static void sta2x11_vip_init_register(struct sta2x11_vip *vip)
810 {
811 	/* Register initialization */
812 	spin_lock_irq(&vip->slock);
813 	/* Clean interrupt */
814 	reg_read(vip, DVP_ITS);
815 	/* Enable Half Line per vertical */
816 	reg_write(vip, DVP_HLFLN, DVP_HLFLN_SD);
817 	/* Reset VIP control */
818 	reg_write(vip, DVP_CTL, DVP_CTL_RST);
819 	/* Clear VIP control */
820 	reg_write(vip, DVP_CTL, 0);
821 	spin_unlock_irq(&vip->slock);
822 }
823 static void sta2x11_vip_clear_register(struct sta2x11_vip *vip)
824 {
825 	spin_lock_irq(&vip->slock);
826 	/* Disable interrupt */
827 	reg_write(vip, DVP_ITM, 0);
828 	/* Reset VIP Control */
829 	reg_write(vip, DVP_CTL, DVP_CTL_RST);
830 	/* Clear VIP Control */
831 	reg_write(vip, DVP_CTL, 0);
832 	/* Clean VIP Interrupt */
833 	reg_read(vip, DVP_ITS);
834 	spin_unlock_irq(&vip->slock);
835 }
836 static int sta2x11_vip_init_buffer(struct sta2x11_vip *vip)
837 {
838 	int err;
839 
840 	err = dma_set_coherent_mask(&vip->pdev->dev, DMA_BIT_MASK(29));
841 	if (err) {
842 		v4l2_err(&vip->v4l2_dev, "Cannot configure coherent mask");
843 		return err;
844 	}
845 	memset(&vip->vb_vidq, 0, sizeof(struct vb2_queue));
846 	vip->vb_vidq.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
847 	vip->vb_vidq.io_modes = VB2_MMAP | VB2_READ;
848 	vip->vb_vidq.drv_priv = vip;
849 	vip->vb_vidq.buf_struct_size = sizeof(struct vip_buffer);
850 	vip->vb_vidq.ops = &vip_video_qops;
851 	vip->vb_vidq.mem_ops = &vb2_dma_contig_memops;
852 	vip->vb_vidq.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
853 	vip->vb_vidq.dev = &vip->pdev->dev;
854 	vip->vb_vidq.lock = &vip->v4l_lock;
855 	err = vb2_queue_init(&vip->vb_vidq);
856 	if (err)
857 		return err;
858 	INIT_LIST_HEAD(&vip->buffer_list);
859 	spin_lock_init(&vip->lock);
860 	return 0;
861 }
862 
863 static int sta2x11_vip_init_controls(struct sta2x11_vip *vip)
864 {
865 	/*
866 	 * Inititialize an empty control so VIP can inerithing controls
867 	 * from ADV7180
868 	 */
869 	v4l2_ctrl_handler_init(&vip->ctrl_hdl, 0);
870 
871 	vip->v4l2_dev.ctrl_handler = &vip->ctrl_hdl;
872 	if (vip->ctrl_hdl.error) {
873 		int err = vip->ctrl_hdl.error;
874 
875 		v4l2_ctrl_handler_free(&vip->ctrl_hdl);
876 		return err;
877 	}
878 
879 	return 0;
880 }
881 
882 /**
883  * vip_gpio_reserve - reserve gpio pin
884  * @dev: device
885  * @pin: GPIO pin number
886  * @dir: direction, input or output
887  * @name: GPIO pin name
888  *
889  */
890 static int vip_gpio_reserve(struct device *dev, int pin, int dir,
891 			    const char *name)
892 {
893 	struct gpio_desc *desc = gpio_to_desc(pin);
894 	int ret = -ENODEV;
895 
896 	if (!gpio_is_valid(pin))
897 		return ret;
898 
899 	ret = gpio_request(pin, name);
900 	if (ret) {
901 		dev_err(dev, "Failed to allocate pin %d (%s)\n", pin, name);
902 		return ret;
903 	}
904 
905 	ret = gpiod_direction_output(desc, dir);
906 	if (ret) {
907 		dev_err(dev, "Failed to set direction for pin %d (%s)\n",
908 			pin, name);
909 		gpio_free(pin);
910 		return ret;
911 	}
912 
913 	ret = gpiod_export(desc, false);
914 	if (ret) {
915 		dev_err(dev, "Failed to export pin %d (%s)\n", pin, name);
916 		gpio_free(pin);
917 		return ret;
918 	}
919 
920 	return 0;
921 }
922 
923 /**
924  * vip_gpio_release - release gpio pin
925  * @dev: device
926  * @pin: GPIO pin number
927  * @name: GPIO pin name
928  *
929  */
930 static void vip_gpio_release(struct device *dev, int pin, const char *name)
931 {
932 	if (gpio_is_valid(pin)) {
933 		struct gpio_desc *desc = gpio_to_desc(pin);
934 
935 		dev_dbg(dev, "releasing pin %d (%s)\n",	pin, name);
936 		gpiod_unexport(desc);
937 		gpio_free(pin);
938 	}
939 }
940 
941 /**
942  * sta2x11_vip_init_one - init one instance of video device
943  * @pdev: PCI device
944  * @ent: (not used)
945  *
946  * allocate reset pins for DAC.
947  * Reset video DAC, this is done via reset line.
948  * allocate memory for managing device
949  * request interrupt
950  * map IO region
951  * register device
952  * find and initialize video DAC
953  *
954  * return value: 0, no error
955  *
956  * -ENOMEM, no memory
957  *
958  * -ENODEV, device could not be detected or registered
959  */
960 static int sta2x11_vip_init_one(struct pci_dev *pdev,
961 				const struct pci_device_id *ent)
962 {
963 	int ret;
964 	struct sta2x11_vip *vip;
965 	struct vip_config *config;
966 
967 	/* Check if hardware support 26-bit DMA */
968 	if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(26))) {
969 		dev_err(&pdev->dev, "26-bit DMA addressing not available\n");
970 		return -EINVAL;
971 	}
972 	/* Enable PCI */
973 	ret = pci_enable_device(pdev);
974 	if (ret)
975 		return ret;
976 
977 	/* Get VIP platform data */
978 	config = dev_get_platdata(&pdev->dev);
979 	if (!config) {
980 		dev_info(&pdev->dev, "VIP slot disabled\n");
981 		ret = -EINVAL;
982 		goto disable;
983 	}
984 
985 	/* Power configuration */
986 	ret = vip_gpio_reserve(&pdev->dev, config->pwr_pin, 0,
987 			       config->pwr_name);
988 	if (ret)
989 		goto disable;
990 
991 	ret = vip_gpio_reserve(&pdev->dev, config->reset_pin, 0,
992 			       config->reset_name);
993 	if (ret) {
994 		vip_gpio_release(&pdev->dev, config->pwr_pin,
995 				 config->pwr_name);
996 		goto disable;
997 	}
998 
999 	if (gpio_is_valid(config->pwr_pin)) {
1000 		/* Datasheet says 5ms between PWR and RST */
1001 		usleep_range(5000, 25000);
1002 		gpio_direction_output(config->pwr_pin, 1);
1003 	}
1004 
1005 	if (gpio_is_valid(config->reset_pin)) {
1006 		/* Datasheet says 5ms between PWR and RST */
1007 		usleep_range(5000, 25000);
1008 		gpio_direction_output(config->reset_pin, 1);
1009 	}
1010 	usleep_range(5000, 25000);
1011 
1012 	/* Allocate a new VIP instance */
1013 	vip = kzalloc(sizeof(struct sta2x11_vip), GFP_KERNEL);
1014 	if (!vip) {
1015 		ret = -ENOMEM;
1016 		goto release_gpios;
1017 	}
1018 	vip->pdev = pdev;
1019 	vip->std = V4L2_STD_PAL;
1020 	vip->format = formats_50[0];
1021 	vip->config = config;
1022 	mutex_init(&vip->v4l_lock);
1023 
1024 	ret = sta2x11_vip_init_controls(vip);
1025 	if (ret)
1026 		goto free_mem;
1027 	ret = v4l2_device_register(&pdev->dev, &vip->v4l2_dev);
1028 	if (ret)
1029 		goto free_mem;
1030 
1031 	dev_dbg(&pdev->dev, "BAR #0 at 0x%lx 0x%lx irq %d\n",
1032 		(unsigned long)pci_resource_start(pdev, 0),
1033 		(unsigned long)pci_resource_len(pdev, 0), pdev->irq);
1034 
1035 	pci_set_master(pdev);
1036 
1037 	ret = pci_request_regions(pdev, KBUILD_MODNAME);
1038 	if (ret)
1039 		goto unreg;
1040 
1041 	vip->iomem = pci_iomap(pdev, 0, 0x100);
1042 	if (!vip->iomem) {
1043 		ret = -ENOMEM;
1044 		goto release;
1045 	}
1046 
1047 	pci_enable_msi(pdev);
1048 
1049 	/* Initialize buffer */
1050 	ret = sta2x11_vip_init_buffer(vip);
1051 	if (ret)
1052 		goto unmap;
1053 
1054 	spin_lock_init(&vip->slock);
1055 
1056 	ret = request_irq(pdev->irq,
1057 			  (irq_handler_t) vip_irq,
1058 			  IRQF_SHARED, KBUILD_MODNAME, vip);
1059 	if (ret) {
1060 		dev_err(&pdev->dev, "request_irq failed\n");
1061 		ret = -ENODEV;
1062 		goto release_buf;
1063 	}
1064 
1065 	/* Initialize and register video device */
1066 	vip->video_dev = video_dev_template;
1067 	vip->video_dev.v4l2_dev = &vip->v4l2_dev;
1068 	vip->video_dev.queue = &vip->vb_vidq;
1069 	vip->video_dev.lock = &vip->v4l_lock;
1070 	video_set_drvdata(&vip->video_dev, vip);
1071 
1072 	ret = video_register_device(&vip->video_dev, VFL_TYPE_VIDEO, -1);
1073 	if (ret)
1074 		goto vrelease;
1075 
1076 	/* Get ADV7180 subdevice */
1077 	vip->adapter = i2c_get_adapter(vip->config->i2c_id);
1078 	if (!vip->adapter) {
1079 		ret = -ENODEV;
1080 		dev_err(&pdev->dev, "no I2C adapter found\n");
1081 		goto vunreg;
1082 	}
1083 
1084 	vip->decoder = v4l2_i2c_new_subdev(&vip->v4l2_dev, vip->adapter,
1085 					   "adv7180", vip->config->i2c_addr,
1086 					   NULL);
1087 	if (!vip->decoder) {
1088 		ret = -ENODEV;
1089 		dev_err(&pdev->dev, "no decoder found\n");
1090 		goto vunreg;
1091 	}
1092 
1093 	i2c_put_adapter(vip->adapter);
1094 	v4l2_subdev_call(vip->decoder, core, init, 0);
1095 
1096 	sta2x11_vip_init_register(vip);
1097 
1098 	dev_info(&pdev->dev, "STA2X11 Video Input Port (VIP) loaded\n");
1099 	return 0;
1100 
1101 vunreg:
1102 	video_set_drvdata(&vip->video_dev, NULL);
1103 vrelease:
1104 	vb2_video_unregister_device(&vip->video_dev);
1105 	free_irq(pdev->irq, vip);
1106 release_buf:
1107 	pci_disable_msi(pdev);
1108 unmap:
1109 	pci_iounmap(pdev, vip->iomem);
1110 release:
1111 	pci_release_regions(pdev);
1112 unreg:
1113 	v4l2_device_unregister(&vip->v4l2_dev);
1114 free_mem:
1115 	kfree(vip);
1116 release_gpios:
1117 	vip_gpio_release(&pdev->dev, config->reset_pin, config->reset_name);
1118 	vip_gpio_release(&pdev->dev, config->pwr_pin, config->pwr_name);
1119 disable:
1120 	/*
1121 	 * do not call pci_disable_device on sta2x11 because it break all
1122 	 * other Bus masters on this EP
1123 	 */
1124 	return ret;
1125 }
1126 
1127 /**
1128  * sta2x11_vip_remove_one - release device
1129  * @pdev: PCI device
1130  *
1131  * Undo everything done in .._init_one
1132  *
1133  * unregister video device
1134  * free interrupt
1135  * unmap ioadresses
1136  * free memory
1137  * free GPIO pins
1138  */
1139 static void sta2x11_vip_remove_one(struct pci_dev *pdev)
1140 {
1141 	struct v4l2_device *v4l2_dev = pci_get_drvdata(pdev);
1142 	struct sta2x11_vip *vip =
1143 	    container_of(v4l2_dev, struct sta2x11_vip, v4l2_dev);
1144 
1145 	sta2x11_vip_clear_register(vip);
1146 
1147 	video_set_drvdata(&vip->video_dev, NULL);
1148 	vb2_video_unregister_device(&vip->video_dev);
1149 	free_irq(pdev->irq, vip);
1150 	pci_disable_msi(pdev);
1151 	pci_iounmap(pdev, vip->iomem);
1152 	pci_release_regions(pdev);
1153 
1154 	v4l2_device_unregister(&vip->v4l2_dev);
1155 
1156 	vip_gpio_release(&pdev->dev, vip->config->pwr_pin,
1157 			 vip->config->pwr_name);
1158 	vip_gpio_release(&pdev->dev, vip->config->reset_pin,
1159 			 vip->config->reset_name);
1160 
1161 	kfree(vip);
1162 	/*
1163 	 * do not call pci_disable_device on sta2x11 because it break all
1164 	 * other Bus masters on this EP
1165 	 */
1166 }
1167 
1168 /**
1169  * sta2x11_vip_suspend - set device into power save mode
1170  * @dev_d: PCI device
1171  *
1172  * all relevant registers are saved and an attempt to set a new state is made.
1173  *
1174  * return value: 0 always indicate success,
1175  * even if device could not be disabled. (workaround for hardware problem)
1176  */
1177 static int __maybe_unused sta2x11_vip_suspend(struct device *dev_d)
1178 {
1179 	struct v4l2_device *v4l2_dev = dev_get_drvdata(dev_d);
1180 	struct sta2x11_vip *vip =
1181 	    container_of(v4l2_dev, struct sta2x11_vip, v4l2_dev);
1182 	unsigned long flags;
1183 	int i;
1184 
1185 	spin_lock_irqsave(&vip->slock, flags);
1186 	vip->register_save_area[0] = reg_read(vip, DVP_CTL);
1187 	reg_write(vip, DVP_CTL, vip->register_save_area[0] & DVP_CTL_DIS);
1188 	vip->register_save_area[SAVE_COUNT] = reg_read(vip, DVP_ITM);
1189 	reg_write(vip, DVP_ITM, 0);
1190 	for (i = 1; i < SAVE_COUNT; i++)
1191 		vip->register_save_area[i] = reg_read(vip, 4 * i);
1192 	for (i = 0; i < AUX_COUNT; i++)
1193 		vip->register_save_area[SAVE_COUNT + IRQ_COUNT + i] =
1194 		    reg_read(vip, registers_to_save[i]);
1195 	spin_unlock_irqrestore(&vip->slock, flags);
1196 
1197 	vip->disabled = 1;
1198 
1199 	pr_info("VIP: suspend\n");
1200 	return 0;
1201 }
1202 
1203 /**
1204  * sta2x11_vip_resume - resume device operation
1205  * @dev_d : PCI device
1206  *
1207  * return value: 0, no error.
1208  *
1209  * other, could not set device to power on state.
1210  */
1211 static int __maybe_unused sta2x11_vip_resume(struct device *dev_d)
1212 {
1213 	struct v4l2_device *v4l2_dev = dev_get_drvdata(dev_d);
1214 	struct sta2x11_vip *vip =
1215 	    container_of(v4l2_dev, struct sta2x11_vip, v4l2_dev);
1216 	unsigned long flags;
1217 	int i;
1218 
1219 	pr_info("VIP: resume\n");
1220 
1221 	vip->disabled = 0;
1222 
1223 	spin_lock_irqsave(&vip->slock, flags);
1224 	for (i = 1; i < SAVE_COUNT; i++)
1225 		reg_write(vip, 4 * i, vip->register_save_area[i]);
1226 	for (i = 0; i < AUX_COUNT; i++)
1227 		reg_write(vip, registers_to_save[i],
1228 			  vip->register_save_area[SAVE_COUNT + IRQ_COUNT + i]);
1229 	reg_write(vip, DVP_CTL, vip->register_save_area[0]);
1230 	reg_write(vip, DVP_ITM, vip->register_save_area[SAVE_COUNT]);
1231 	spin_unlock_irqrestore(&vip->slock, flags);
1232 	return 0;
1233 }
1234 
1235 static const struct pci_device_id sta2x11_vip_pci_tbl[] = {
1236 	{PCI_DEVICE(PCI_VENDOR_ID_STMICRO, PCI_DEVICE_ID_STMICRO_VIP)},
1237 	{0,}
1238 };
1239 
1240 static SIMPLE_DEV_PM_OPS(sta2x11_vip_pm_ops,
1241 			 sta2x11_vip_suspend,
1242 			 sta2x11_vip_resume);
1243 
1244 static struct pci_driver sta2x11_vip_driver = {
1245 	.name = KBUILD_MODNAME,
1246 	.probe = sta2x11_vip_init_one,
1247 	.remove = sta2x11_vip_remove_one,
1248 	.id_table = sta2x11_vip_pci_tbl,
1249 	.driver.pm = &sta2x11_vip_pm_ops,
1250 };
1251 
1252 static int __init sta2x11_vip_init_module(void)
1253 {
1254 	return pci_register_driver(&sta2x11_vip_driver);
1255 }
1256 
1257 static void __exit sta2x11_vip_exit_module(void)
1258 {
1259 	pci_unregister_driver(&sta2x11_vip_driver);
1260 }
1261 
1262 #ifdef MODULE
1263 module_init(sta2x11_vip_init_module);
1264 module_exit(sta2x11_vip_exit_module);
1265 #else
1266 late_initcall_sync(sta2x11_vip_init_module);
1267 #endif
1268 
1269 MODULE_DESCRIPTION("STA2X11 Video Input Port driver");
1270 MODULE_AUTHOR("Wind River");
1271 MODULE_LICENSE("GPL v2");
1272 MODULE_VERSION(DRV_VERSION);
1273 MODULE_DEVICE_TABLE(pci, sta2x11_vip_pci_tbl);
1274