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staging: brcm80211: assure common sources are truly common
[zen-stable.git] / drivers / media / video / sh_mobile_ceu_camera.c
blob954222bc3458d6d2dde208953f99bcb6e2ec7b4b
1 /*
2 * V4L2 Driver for SuperH Mobile CEU interface
3 *
4 * Copyright (C) 2008 Magnus Damm
5 *
6 * Based on V4L2 Driver for PXA camera host - "pxa_camera.c",
7 *
8 * Copyright (C) 2006, Sascha Hauer, Pengutronix
9 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 */
16
17 #include <linux/init.h>
18 #include <linux/module.h>
19 #include <linux/io.h>
20 #include <linux/delay.h>
21 #include <linux/dma-mapping.h>
22 #include <linux/errno.h>
23 #include <linux/fs.h>
24 #include <linux/interrupt.h>
25 #include <linux/kernel.h>
26 #include <linux/mm.h>
27 #include <linux/moduleparam.h>
28 #include <linux/time.h>
29 #include <linux/version.h>
30 #include <linux/slab.h>
31 #include <linux/device.h>
32 #include <linux/platform_device.h>
33 #include <linux/videodev2.h>
34 #include <linux/pm_runtime.h>
35 #include <linux/sched.h>
36
37 #include <media/v4l2-common.h>
38 #include <media/v4l2-dev.h>
39 #include <media/soc_camera.h>
40 #include <media/sh_mobile_ceu.h>
41 #include <media/videobuf-dma-contig.h>
42 #include <media/v4l2-mediabus.h>
43 #include <media/soc_mediabus.h>
44
45 /* register offsets for sh7722 / sh7723 */
46
47 #define CAPSR 0x00 /* Capture start register */
48 #define CAPCR 0x04 /* Capture control register */
49 #define CAMCR 0x08 /* Capture interface control register */
50 #define CMCYR 0x0c /* Capture interface cycle register */
51 #define CAMOR 0x10 /* Capture interface offset register */
52 #define CAPWR 0x14 /* Capture interface width register */
53 #define CAIFR 0x18 /* Capture interface input format register */
54 #define CSTCR 0x20 /* Camera strobe control register (<= sh7722) */
55 #define CSECR 0x24 /* Camera strobe emission count register (<= sh7722) */
56 #define CRCNTR 0x28 /* CEU register control register */
57 #define CRCMPR 0x2c /* CEU register forcible control register */
58 #define CFLCR 0x30 /* Capture filter control register */
59 #define CFSZR 0x34 /* Capture filter size clip register */
60 #define CDWDR 0x38 /* Capture destination width register */
61 #define CDAYR 0x3c /* Capture data address Y register */
62 #define CDACR 0x40 /* Capture data address C register */
63 #define CDBYR 0x44 /* Capture data bottom-field address Y register */
64 #define CDBCR 0x48 /* Capture data bottom-field address C register */
65 #define CBDSR 0x4c /* Capture bundle destination size register */
66 #define CFWCR 0x5c /* Firewall operation control register */
67 #define CLFCR 0x60 /* Capture low-pass filter control register */
68 #define CDOCR 0x64 /* Capture data output control register */
69 #define CDDCR 0x68 /* Capture data complexity level register */
70 #define CDDAR 0x6c /* Capture data complexity level address register */
71 #define CEIER 0x70 /* Capture event interrupt enable register */
72 #define CETCR 0x74 /* Capture event flag clear register */
73 #define CSTSR 0x7c /* Capture status register */
74 #define CSRTR 0x80 /* Capture software reset register */
75 #define CDSSR 0x84 /* Capture data size register */
76 #define CDAYR2 0x90 /* Capture data address Y register 2 */
77 #define CDACR2 0x94 /* Capture data address C register 2 */
78 #define CDBYR2 0x98 /* Capture data bottom-field address Y register 2 */
79 #define CDBCR2 0x9c /* Capture data bottom-field address C register 2 */
80
81 #undef DEBUG_GEOMETRY
82 #ifdef DEBUG_GEOMETRY
83 #define dev_geo dev_info
84 #else
85 #define dev_geo dev_dbg
86 #endif
87
88 /* per video frame buffer */
89 struct sh_mobile_ceu_buffer {
90 struct videobuf_buffer vb; /* v4l buffer must be first */
91 enum v4l2_mbus_pixelcode code;
92 };
93
94 struct sh_mobile_ceu_dev {
95 struct soc_camera_host ici;
96 struct soc_camera_device *icd;
97
98 unsigned int irq;
99 void __iomem *base;
100 unsigned long video_limit;
101
102 /* lock used to protect videobuf */
103 spinlock_t lock;
104 struct list_head capture;
105 struct videobuf_buffer *active;
106
107 struct sh_mobile_ceu_info *pdata;
108
109 u32 cflcr;
110
111 enum v4l2_field field;
112
113 unsigned int image_mode:1;
114 unsigned int is_16bit:1;
115 };
116
117 struct sh_mobile_ceu_cam {
118 /* CEU offsets within scaled by the CEU camera output */
119 unsigned int ceu_left;
120 unsigned int ceu_top;
121 /* Client output, as seen by the CEU */
122 unsigned int width;
123 unsigned int height;
124 /*
125 * User window from S_CROP / G_CROP, produced by client cropping and
126 * scaling, CEU scaling and CEU cropping, mapped back onto the client
127 * input window
128 */
129 struct v4l2_rect subrect;
130 /* Camera cropping rectangle */
131 struct v4l2_rect rect;
132 const struct soc_mbus_pixelfmt *extra_fmt;
133 enum v4l2_mbus_pixelcode code;
134 };
135
136 static unsigned long make_bus_param(struct sh_mobile_ceu_dev *pcdev)
137 {
138 unsigned long flags;
139
140 flags = SOCAM_MASTER |
141 SOCAM_PCLK_SAMPLE_RISING |
142 SOCAM_HSYNC_ACTIVE_HIGH |
143 SOCAM_HSYNC_ACTIVE_LOW |
144 SOCAM_VSYNC_ACTIVE_HIGH |
145 SOCAM_VSYNC_ACTIVE_LOW |
146 SOCAM_DATA_ACTIVE_HIGH;
147
148 if (pcdev->pdata->flags & SH_CEU_FLAG_USE_8BIT_BUS)
149 flags |= SOCAM_DATAWIDTH_8;
150
151 if (pcdev->pdata->flags & SH_CEU_FLAG_USE_16BIT_BUS)
152 flags |= SOCAM_DATAWIDTH_16;
153
154 if (flags & SOCAM_DATAWIDTH_MASK)
155 return flags;
156
157 return 0;
158 }
159
160 static void ceu_write(struct sh_mobile_ceu_dev *priv,
161 unsigned long reg_offs, u32 data)
162 {
163 iowrite32(data, priv->base + reg_offs);
164 }
165
166 static u32 ceu_read(struct sh_mobile_ceu_dev *priv, unsigned long reg_offs)
167 {
168 return ioread32(priv->base + reg_offs);
169 }
170
171 static int sh_mobile_ceu_soft_reset(struct sh_mobile_ceu_dev *pcdev)
172 {
173 int i, success = 0;
174 struct soc_camera_device *icd = pcdev->icd;
175
176 ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
177
178 /* wait CSTSR.CPTON bit */
179 for (i = 0; i < 1000; i++) {
180 if (!(ceu_read(pcdev, CSTSR) & 1)) {
181 success++;
182 break;
183 }
184 udelay(1);
185 }
186
187 /* wait CAPSR.CPKIL bit */
188 for (i = 0; i < 1000; i++) {
189 if (!(ceu_read(pcdev, CAPSR) & (1 << 16))) {
190 success++;
191 break;
192 }
193 udelay(1);
194 }
195
196
197 if (2 != success) {
198 dev_warn(&icd->dev, "soft reset time out\n");
199 return -EIO;
200 }
201
202 return 0;
203 }
204
205 /*
206 * Videobuf operations
207 */
208 static int sh_mobile_ceu_videobuf_setup(struct videobuf_queue *vq,
209 unsigned int *count,
210 unsigned int *size)
211 {
212 struct soc_camera_device *icd = vq->priv_data;
213 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
214 struct sh_mobile_ceu_dev *pcdev = ici->priv;
215 int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
216 icd->current_fmt->host_fmt);
217
218 if (bytes_per_line < 0)
219 return bytes_per_line;
220
221 *size = bytes_per_line * icd->user_height;
222
223 if (0 == *count)
224 *count = 2;
225
226 if (pcdev->video_limit) {
227 if (PAGE_ALIGN(*size) * *count > pcdev->video_limit)
228 *count = pcdev->video_limit / PAGE_ALIGN(*size);
229 }
230
231 dev_dbg(icd->dev.parent, "count=%d, size=%d\n", *count, *size);
232
233 return 0;
234 }
235
236 static void free_buffer(struct videobuf_queue *vq,
237 struct sh_mobile_ceu_buffer *buf)
238 {
239 struct soc_camera_device *icd = vq->priv_data;
240 struct device *dev = icd->dev.parent;
241
242 dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
243 &buf->vb, buf->vb.baddr, buf->vb.bsize);
244
245 if (in_interrupt())
246 BUG();
247
248 videobuf_waiton(vq, &buf->vb, 0, 0);
249 videobuf_dma_contig_free(vq, &buf->vb);
250 dev_dbg(dev, "%s freed\n", __func__);
251 buf->vb.state = VIDEOBUF_NEEDS_INIT;
252 }
253
254 #define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */
255 #define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */
256 #define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */
257 #define CEU_CEIER_VBP (1 << 20) /* vbp error */
258 #define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */
259 #define CEU_CEIER_MASK (CEU_CEIER_CPEIE | CEU_CEIER_VBP)
260
261
262 /*
263 * return value doesn't reflex the success/failure to queue the new buffer,
264 * but rather the status of the previous buffer.
265 */
266 static int sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
267 {
268 struct soc_camera_device *icd = pcdev->icd;
269 dma_addr_t phys_addr_top, phys_addr_bottom;
270 unsigned long top1, top2;
271 unsigned long bottom1, bottom2;
272 u32 status;
273 int ret = 0;
274
275 /*
276 * The hardware is _very_ picky about this sequence. Especially
277 * the CEU_CETCR_MAGIC value. It seems like we need to acknowledge
278 * several not-so-well documented interrupt sources in CETCR.
279 */
280 ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_MASK);
281 status = ceu_read(pcdev, CETCR);
282 ceu_write(pcdev, CETCR, ~status & CEU_CETCR_MAGIC);
283 ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_MASK);
284 ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP);
285 ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW);
286
287 /*
288 * When a VBP interrupt occurs, a capture end interrupt does not occur
289 * and the image of that frame is not captured correctly. So, soft reset
290 * is needed here.
291 */
292 if (status & CEU_CEIER_VBP) {
293 sh_mobile_ceu_soft_reset(pcdev);
294 ret = -EIO;
295 }
296
297 if (!pcdev->active)
298 return ret;
299
300 if (V4L2_FIELD_INTERLACED_BT == pcdev->field) {
301 top1 = CDBYR;
302 top2 = CDBCR;
303 bottom1 = CDAYR;
304 bottom2 = CDACR;
305 } else {
306 top1 = CDAYR;
307 top2 = CDACR;
308 bottom1 = CDBYR;
309 bottom2 = CDBCR;
310 }
311
312 phys_addr_top = videobuf_to_dma_contig(pcdev->active);
313 ceu_write(pcdev, top1, phys_addr_top);
314 if (V4L2_FIELD_NONE != pcdev->field) {
315 phys_addr_bottom = phys_addr_top + icd->user_width;
316 ceu_write(pcdev, bottom1, phys_addr_bottom);
317 }
318
319 switch (icd->current_fmt->host_fmt->fourcc) {
320 case V4L2_PIX_FMT_NV12:
321 case V4L2_PIX_FMT_NV21:
322 case V4L2_PIX_FMT_NV16:
323 case V4L2_PIX_FMT_NV61:
324 phys_addr_top += icd->user_width *
325 icd->user_height;
326 ceu_write(pcdev, top2, phys_addr_top);
327 if (V4L2_FIELD_NONE != pcdev->field) {
328 phys_addr_bottom = phys_addr_top + icd->user_width;
329 ceu_write(pcdev, bottom2, phys_addr_bottom);
330 }
331 }
332
333 pcdev->active->state = VIDEOBUF_ACTIVE;
334 ceu_write(pcdev, CAPSR, 0x1); /* start capture */
335
336 return ret;
337 }
338
339 static int sh_mobile_ceu_videobuf_prepare(struct videobuf_queue *vq,
340 struct videobuf_buffer *vb,
341 enum v4l2_field field)
342 {
343 struct soc_camera_device *icd = vq->priv_data;
344 struct sh_mobile_ceu_buffer *buf;
345 int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
346 icd->current_fmt->host_fmt);
347 int ret;
348
349 if (bytes_per_line < 0)
350 return bytes_per_line;
351
352 buf = container_of(vb, struct sh_mobile_ceu_buffer, vb);
353
354 dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
355 vb, vb->baddr, vb->bsize);
356
357 /* Added list head initialization on alloc */
358 WARN_ON(!list_empty(&vb->queue));
359
360 #ifdef DEBUG
361 /*
362 * This can be useful if you want to see if we actually fill
363 * the buffer with something
364 */
365 memset((void *)vb->baddr, 0xaa, vb->bsize);
366 #endif
367
368 BUG_ON(NULL == icd->current_fmt);
369
370 if (buf->code != icd->current_fmt->code ||
371 vb->width != icd->user_width ||
372 vb->height != icd->user_height ||
373 vb->field != field) {
374 buf->code = icd->current_fmt->code;
375 vb->width = icd->user_width;
376 vb->height = icd->user_height;
377 vb->field = field;
378 vb->state = VIDEOBUF_NEEDS_INIT;
379 }
380
381 vb->size = vb->height * bytes_per_line;
382 if (0 != vb->baddr && vb->bsize < vb->size) {
383 ret = -EINVAL;
384 goto out;
385 }
386
387 if (vb->state == VIDEOBUF_NEEDS_INIT) {
388 ret = videobuf_iolock(vq, vb, NULL);
389 if (ret)
390 goto fail;
391 vb->state = VIDEOBUF_PREPARED;
392 }
393
394 return 0;
395 fail:
396 free_buffer(vq, buf);
397 out:
398 return ret;
399 }
400
401 /* Called under spinlock_irqsave(&pcdev->lock, ...) */
402 static void sh_mobile_ceu_videobuf_queue(struct videobuf_queue *vq,
403 struct videobuf_buffer *vb)
404 {
405 struct soc_camera_device *icd = vq->priv_data;
406 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
407 struct sh_mobile_ceu_dev *pcdev = ici->priv;
408
409 dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
410 vb, vb->baddr, vb->bsize);
411
412 vb->state = VIDEOBUF_QUEUED;
413 list_add_tail(&vb->queue, &pcdev->capture);
414
415 if (!pcdev->active) {
416 /*
417 * Because there were no active buffer at this moment,
418 * we are not interested in the return value of
419 * sh_mobile_ceu_capture here.
420 */
421 pcdev->active = vb;
422 sh_mobile_ceu_capture(pcdev);
423 }
424 }
425
426 static void sh_mobile_ceu_videobuf_release(struct videobuf_queue *vq,
427 struct videobuf_buffer *vb)
428 {
429 struct soc_camera_device *icd = vq->priv_data;
430 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
431 struct sh_mobile_ceu_dev *pcdev = ici->priv;
432 unsigned long flags;
433
434 spin_lock_irqsave(&pcdev->lock, flags);
435
436 if (pcdev->active == vb) {
437 /* disable capture (release DMA buffer), reset */
438 ceu_write(pcdev, CAPSR, 1 << 16);
439 pcdev->active = NULL;
440 }
441
442 if ((vb->state == VIDEOBUF_ACTIVE || vb->state == VIDEOBUF_QUEUED) &&
443 !list_empty(&vb->queue)) {
444 vb->state = VIDEOBUF_ERROR;
445 list_del_init(&vb->queue);
446 }
447
448 spin_unlock_irqrestore(&pcdev->lock, flags);
449
450 free_buffer(vq, container_of(vb, struct sh_mobile_ceu_buffer, vb));
451 }
452
453 static struct videobuf_queue_ops sh_mobile_ceu_videobuf_ops = {
454 .buf_setup = sh_mobile_ceu_videobuf_setup,
455 .buf_prepare = sh_mobile_ceu_videobuf_prepare,
456 .buf_queue = sh_mobile_ceu_videobuf_queue,
457 .buf_release = sh_mobile_ceu_videobuf_release,
458 };
459
460 static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
461 {
462 struct sh_mobile_ceu_dev *pcdev = data;
463 struct videobuf_buffer *vb;
464 unsigned long flags;
465
466 spin_lock_irqsave(&pcdev->lock, flags);
467
468 vb = pcdev->active;
469 if (!vb)
470 /* Stale interrupt from a released buffer */
471 goto out;
472
473 list_del_init(&vb->queue);
474
475 if (!list_empty(&pcdev->capture))
476 pcdev->active = list_entry(pcdev->capture.next,
477 struct videobuf_buffer, queue);
478 else
479 pcdev->active = NULL;
480
481 vb->state = (sh_mobile_ceu_capture(pcdev) < 0) ?
482 VIDEOBUF_ERROR : VIDEOBUF_DONE;
483 do_gettimeofday(&vb->ts);
484 vb->field_count++;
485 wake_up(&vb->done);
486
487 out:
488 spin_unlock_irqrestore(&pcdev->lock, flags);
489
490 return IRQ_HANDLED;
491 }
492
493 /* Called with .video_lock held */
494 static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
495 {
496 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
497 struct sh_mobile_ceu_dev *pcdev = ici->priv;
498 int ret;
499
500 if (pcdev->icd)
501 return -EBUSY;
502
503 dev_info(icd->dev.parent,
504 "SuperH Mobile CEU driver attached to camera %d\n",
505 icd->devnum);
506
507 pm_runtime_get_sync(ici->v4l2_dev.dev);
508
509 ret = sh_mobile_ceu_soft_reset(pcdev);
510 if (!ret)
511 pcdev->icd = icd;
512
513 return ret;
514 }
515
516 /* Called with .video_lock held */
517 static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
518 {
519 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
520 struct sh_mobile_ceu_dev *pcdev = ici->priv;
521 unsigned long flags;
522
523 BUG_ON(icd != pcdev->icd);
524
525 /* disable capture, disable interrupts */
526 ceu_write(pcdev, CEIER, 0);
527 sh_mobile_ceu_soft_reset(pcdev);
528
529 /* make sure active buffer is canceled */
530 spin_lock_irqsave(&pcdev->lock, flags);
531 if (pcdev->active) {
532 list_del(&pcdev->active->queue);
533 pcdev->active->state = VIDEOBUF_ERROR;
534 wake_up_all(&pcdev->active->done);
535 pcdev->active = NULL;
536 }
537 spin_unlock_irqrestore(&pcdev->lock, flags);
538
539 pm_runtime_put_sync(ici->v4l2_dev.dev);
540
541 dev_info(icd->dev.parent,
542 "SuperH Mobile CEU driver detached from camera %d\n",
543 icd->devnum);
544
545 pcdev->icd = NULL;
546 }
547
548 /*
549 * See chapter 29.4.12 "Capture Filter Control Register (CFLCR)"
550 * in SH7722 Hardware Manual
551 */
552 static unsigned int size_dst(unsigned int src, unsigned int scale)
553 {
554 unsigned int mant_pre = scale >> 12;
555 if (!src || !scale)
556 return src;
557 return ((mant_pre + 2 * (src - 1)) / (2 * mant_pre) - 1) *
558 mant_pre * 4096 / scale + 1;
559 }
560
561 static u16 calc_scale(unsigned int src, unsigned int *dst)
562 {
563 u16 scale;
564
565 if (src == *dst)
566 return 0;
567
568 scale = (src * 4096 / *dst) & ~7;
569
570 while (scale > 4096 && size_dst(src, scale) < *dst)
571 scale -= 8;
572
573 *dst = size_dst(src, scale);
574
575 return scale;
576 }
577
578 /* rect is guaranteed to not exceed the scaled camera rectangle */
579 static void sh_mobile_ceu_set_rect(struct soc_camera_device *icd)
580 {
581 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
582 struct sh_mobile_ceu_cam *cam = icd->host_priv;
583 struct sh_mobile_ceu_dev *pcdev = ici->priv;
584 unsigned int height, width, cdwdr_width, in_width, in_height;
585 unsigned int left_offset, top_offset;
586 u32 camor;
587
588 dev_geo(icd->dev.parent, "Crop %ux%u@%u:%u\n",
589 icd->user_width, icd->user_height, cam->ceu_left, cam->ceu_top);
590
591 left_offset = cam->ceu_left;
592 top_offset = cam->ceu_top;
593
594 /* CEU cropping (CFSZR) is applied _after_ the scaling filter (CFLCR) */
595 if (pcdev->image_mode) {
596 in_width = cam->width;
597 if (!pcdev->is_16bit) {
598 in_width *= 2;
599 left_offset *= 2;
600 }
601 width = icd->user_width;
602 cdwdr_width = icd->user_width;
603 } else {
604 int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
605 icd->current_fmt->host_fmt);
606 unsigned int w_factor;
607
608 width = icd->user_width;
609
610 switch (icd->current_fmt->host_fmt->packing) {
611 case SOC_MBUS_PACKING_2X8_PADHI:
612 w_factor = 2;
613 break;
614 default:
615 w_factor = 1;
616 }
617
618 in_width = cam->width * w_factor;
619 left_offset = left_offset * w_factor;
620
621 if (bytes_per_line < 0)
622 cdwdr_width = icd->user_width;
623 else
624 cdwdr_width = bytes_per_line;
625 }
626
627 height = icd->user_height;
628 in_height = cam->height;
629 if (V4L2_FIELD_NONE != pcdev->field) {
630 height /= 2;
631 in_height /= 2;
632 top_offset /= 2;
633 cdwdr_width *= 2;
634 }
635
636 /* CSI2 special configuration */
637 if (pcdev->pdata->csi2_dev) {
638 in_width = ((in_width - 2) * 2);
639 left_offset *= 2;
640 }
641
642 /* Set CAMOR, CAPWR, CFSZR, take care of CDWDR */
643 camor = left_offset | (top_offset << 16);
644
645 dev_geo(icd->dev.parent,
646 "CAMOR 0x%x, CAPWR 0x%x, CFSZR 0x%x, CDWDR 0x%x\n", camor,
647 (in_height << 16) | in_width, (height << 16) | width,
648 cdwdr_width);
649
650 ceu_write(pcdev, CAMOR, camor);
651 ceu_write(pcdev, CAPWR, (in_height << 16) | in_width);
652 ceu_write(pcdev, CFSZR, (height << 16) | width);
653 ceu_write(pcdev, CDWDR, cdwdr_width);
654 }
655
656 static u32 capture_save_reset(struct sh_mobile_ceu_dev *pcdev)
657 {
658 u32 capsr = ceu_read(pcdev, CAPSR);
659 ceu_write(pcdev, CAPSR, 1 << 16); /* reset, stop capture */
660 return capsr;
661 }
662
663 static void capture_restore(struct sh_mobile_ceu_dev *pcdev, u32 capsr)
664 {
665 unsigned long timeout = jiffies + 10 * HZ;
666
667 /*
668 * Wait until the end of the current frame. It can take a long time,
669 * but if it has been aborted by a CAPSR reset, it shoule exit sooner.
670 */
671 while ((ceu_read(pcdev, CSTSR) & 1) && time_before(jiffies, timeout))
672 msleep(1);
673
674 if (time_after(jiffies, timeout)) {
675 dev_err(pcdev->ici.v4l2_dev.dev,
676 "Timeout waiting for frame end! Interface problem?\n");
677 return;
678 }
679
680 /* Wait until reset clears, this shall not hang... */
681 while (ceu_read(pcdev, CAPSR) & (1 << 16))
682 udelay(10);
683
684 /* Anything to restore? */
685 if (capsr & ~(1 << 16))
686 ceu_write(pcdev, CAPSR, capsr);
687 }
688
689 static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
690 __u32 pixfmt)
691 {
692 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
693 struct sh_mobile_ceu_dev *pcdev = ici->priv;
694 int ret;
695 unsigned long camera_flags, common_flags, value;
696 int yuv_lineskip;
697 struct sh_mobile_ceu_cam *cam = icd->host_priv;
698 u32 capsr = capture_save_reset(pcdev);
699
700 camera_flags = icd->ops->query_bus_param(icd);
701 common_flags = soc_camera_bus_param_compatible(camera_flags,
702 make_bus_param(pcdev));
703 if (!common_flags)
704 return -EINVAL;
705
706 /* Make choises, based on platform preferences */
707 if ((common_flags & SOCAM_HSYNC_ACTIVE_HIGH) &&
708 (common_flags & SOCAM_HSYNC_ACTIVE_LOW)) {
709 if (pcdev->pdata->flags & SH_CEU_FLAG_HSYNC_LOW)
710 common_flags &= ~SOCAM_HSYNC_ACTIVE_HIGH;
711 else
712 common_flags &= ~SOCAM_HSYNC_ACTIVE_LOW;
713 }
714
715 if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) &&
716 (common_flags & SOCAM_VSYNC_ACTIVE_LOW)) {
717 if (pcdev->pdata->flags & SH_CEU_FLAG_VSYNC_LOW)
718 common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH;
719 else
720 common_flags &= ~SOCAM_VSYNC_ACTIVE_LOW;
721 }
722
723 ret = icd->ops->set_bus_param(icd, common_flags);
724 if (ret < 0)
725 return ret;
726
727 switch (common_flags & SOCAM_DATAWIDTH_MASK) {
728 case SOCAM_DATAWIDTH_8:
729 pcdev->is_16bit = 0;
730 break;
731 case SOCAM_DATAWIDTH_16:
732 pcdev->is_16bit = 1;
733 break;
734 default:
735 return -EINVAL;
736 }
737
738 ceu_write(pcdev, CRCNTR, 0);
739 ceu_write(pcdev, CRCMPR, 0);
740
741 value = 0x00000010; /* data fetch by default */
742 yuv_lineskip = 0;
743
744 switch (icd->current_fmt->host_fmt->fourcc) {
745 case V4L2_PIX_FMT_NV12:
746 case V4L2_PIX_FMT_NV21:
747 yuv_lineskip = 1; /* skip for NV12/21, no skip for NV16/61 */
748 /* fall-through */
749 case V4L2_PIX_FMT_NV16:
750 case V4L2_PIX_FMT_NV61:
751 switch (cam->code) {
752 case V4L2_MBUS_FMT_UYVY8_2X8:
753 value = 0x00000000; /* Cb0, Y0, Cr0, Y1 */
754 break;
755 case V4L2_MBUS_FMT_VYUY8_2X8:
756 value = 0x00000100; /* Cr0, Y0, Cb0, Y1 */
757 break;
758 case V4L2_MBUS_FMT_YUYV8_2X8:
759 value = 0x00000200; /* Y0, Cb0, Y1, Cr0 */
760 break;
761 case V4L2_MBUS_FMT_YVYU8_2X8:
762 value = 0x00000300; /* Y0, Cr0, Y1, Cb0 */
763 break;
764 default:
765 BUG();
766 }
767 }
768
769 if (icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV21 ||
770 icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV61)
771 value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */
772
773 value |= common_flags & SOCAM_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
774 value |= common_flags & SOCAM_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
775 value |= pcdev->is_16bit ? 1 << 12 : 0;
776
777 /* CSI2 mode */
778 if (pcdev->pdata->csi2_dev)
779 value |= 3 << 12;
780
781 ceu_write(pcdev, CAMCR, value);
782
783 ceu_write(pcdev, CAPCR, 0x00300000);
784
785 switch (pcdev->field) {
786 case V4L2_FIELD_INTERLACED_TB:
787 value = 0x101;
788 break;
789 case V4L2_FIELD_INTERLACED_BT:
790 value = 0x102;
791 break;
792 default:
793 value = 0;
794 break;
795 }
796 ceu_write(pcdev, CAIFR, value);
797
798 sh_mobile_ceu_set_rect(icd);
799 mdelay(1);
800
801 dev_geo(icd->dev.parent, "CFLCR 0x%x\n", pcdev->cflcr);
802 ceu_write(pcdev, CFLCR, pcdev->cflcr);
803
804 /*
805 * A few words about byte order (observed in Big Endian mode)
806 *
807 * In data fetch mode bytes are received in chunks of 8 bytes.
808 * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
809 *
810 * The data is however by default written to memory in reverse order:
811 * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
812 *
813 * The lowest three bits of CDOCR allows us to do swapping,
814 * using 7 we swap the data bytes to match the incoming order:
815 * D0, D1, D2, D3, D4, D5, D6, D7
816 */
817 value = 0x00000017;
818 if (yuv_lineskip)
819 value &= ~0x00000010; /* convert 4:2:2 -> 4:2:0 */
820
821 ceu_write(pcdev, CDOCR, value);
822 ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
823
824 dev_dbg(icd->dev.parent, "S_FMT successful for %c%c%c%c %ux%u\n",
825 pixfmt & 0xff, (pixfmt >> 8) & 0xff,
826 (pixfmt >> 16) & 0xff, (pixfmt >> 24) & 0xff,
827 icd->user_width, icd->user_height);
828
829 capture_restore(pcdev, capsr);
830
831 /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
832 return 0;
833 }
834
835 static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd,
836 unsigned char buswidth)
837 {
838 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
839 struct sh_mobile_ceu_dev *pcdev = ici->priv;
840 unsigned long camera_flags, common_flags;
841
842 camera_flags = icd->ops->query_bus_param(icd);
843 common_flags = soc_camera_bus_param_compatible(camera_flags,
844 make_bus_param(pcdev));
845 if (!common_flags || buswidth > 16 ||
846 (buswidth > 8 && !(common_flags & SOCAM_DATAWIDTH_16)))
847 return -EINVAL;
848
849 return 0;
850 }
851
852 static const struct soc_mbus_pixelfmt sh_mobile_ceu_formats[] = {
853 {
854 .fourcc = V4L2_PIX_FMT_NV12,
855 .name = "NV12",
856 .bits_per_sample = 12,
857 .packing = SOC_MBUS_PACKING_NONE,
858 .order = SOC_MBUS_ORDER_LE,
859 }, {
860 .fourcc = V4L2_PIX_FMT_NV21,
861 .name = "NV21",
862 .bits_per_sample = 12,
863 .packing = SOC_MBUS_PACKING_NONE,
864 .order = SOC_MBUS_ORDER_LE,
865 }, {
866 .fourcc = V4L2_PIX_FMT_NV16,
867 .name = "NV16",
868 .bits_per_sample = 16,
869 .packing = SOC_MBUS_PACKING_NONE,
870 .order = SOC_MBUS_ORDER_LE,
871 }, {
872 .fourcc = V4L2_PIX_FMT_NV61,
873 .name = "NV61",
874 .bits_per_sample = 16,
875 .packing = SOC_MBUS_PACKING_NONE,
876 .order = SOC_MBUS_ORDER_LE,
877 },
878 };
879
880 /* This will be corrected as we get more formats */
881 static bool sh_mobile_ceu_packing_supported(const struct soc_mbus_pixelfmt *fmt)
882 {
883 return fmt->packing == SOC_MBUS_PACKING_NONE ||
884 (fmt->bits_per_sample == 8 &&
885 fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
886 (fmt->bits_per_sample > 8 &&
887 fmt->packing == SOC_MBUS_PACKING_EXTEND16);
888 }
889
890 static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect);
891
892 static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, unsigned int idx,
893 struct soc_camera_format_xlate *xlate)
894 {
895 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
896 struct device *dev = icd->dev.parent;
897 struct soc_camera_host *ici = to_soc_camera_host(dev);
898 struct sh_mobile_ceu_dev *pcdev = ici->priv;
899 int ret, k, n;
900 int formats = 0;
901 struct sh_mobile_ceu_cam *cam;
902 enum v4l2_mbus_pixelcode code;
903 const struct soc_mbus_pixelfmt *fmt;
904
905 ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
906 if (ret < 0)
907 /* No more formats */
908 return 0;
909
910 fmt = soc_mbus_get_fmtdesc(code);
911 if (!fmt) {
912 dev_err(dev, "Invalid format code #%u: %d\n", idx, code);
913 return -EINVAL;
914 }
915
916 if (!pcdev->pdata->csi2_dev) {
917 ret = sh_mobile_ceu_try_bus_param(icd, fmt->bits_per_sample);
918 if (ret < 0)
919 return 0;
920 }
921
922 if (!icd->host_priv) {
923 struct v4l2_mbus_framefmt mf;
924 struct v4l2_rect rect;
925 int shift = 0;
926
927 /* FIXME: subwindow is lost between close / open */
928
929 /* Cache current client geometry */
930 ret = client_g_rect(sd, &rect);
931 if (ret < 0)
932 return ret;
933
934 /* First time */
935 ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
936 if (ret < 0)
937 return ret;
938
939 while ((mf.width > 2560 || mf.height > 1920) && shift < 4) {
940 /* Try 2560x1920, 1280x960, 640x480, 320x240 */
941 mf.width = 2560 >> shift;
942 mf.height = 1920 >> shift;
943 ret = v4l2_device_call_until_err(sd->v4l2_dev, 0, video,
944 s_mbus_fmt, &mf);
945 if (ret < 0)
946 return ret;
947 shift++;
948 }
949
950 if (shift == 4) {
951 dev_err(dev, "Failed to configure the client below %ux%x\n",
952 mf.width, mf.height);
953 return -EIO;
954 }
955
956 dev_geo(dev, "camera fmt %ux%u\n", mf.width, mf.height);
957
958 cam = kzalloc(sizeof(*cam), GFP_KERNEL);
959 if (!cam)
960 return -ENOMEM;
961
962 /* We are called with current camera crop, initialise subrect with it */
963 cam->rect = rect;
964 cam->subrect = rect;
965
966 cam->width = mf.width;
967 cam->height = mf.height;
968
969 cam->width = mf.width;
970 cam->height = mf.height;
971
972 icd->host_priv = cam;
973 } else {
974 cam = icd->host_priv;
975 }
976
977 /* Beginning of a pass */
978 if (!idx)
979 cam->extra_fmt = NULL;
980
981 switch (code) {
982 case V4L2_MBUS_FMT_UYVY8_2X8:
983 case V4L2_MBUS_FMT_VYUY8_2X8:
984 case V4L2_MBUS_FMT_YUYV8_2X8:
985 case V4L2_MBUS_FMT_YVYU8_2X8:
986 if (cam->extra_fmt)
987 break;
988
989 /*
990 * Our case is simple so far: for any of the above four camera
991 * formats we add all our four synthesized NV* formats, so,
992 * just marking the device with a single flag suffices. If
993 * the format generation rules are more complex, you would have
994 * to actually hang your already added / counted formats onto
995 * the host_priv pointer and check whether the format you're
996 * going to add now is already there.
997 */
998 cam->extra_fmt = sh_mobile_ceu_formats;
999
1000 n = ARRAY_SIZE(sh_mobile_ceu_formats);
1001 formats += n;
1002 for (k = 0; xlate && k < n; k++) {
1003 xlate->host_fmt = &sh_mobile_ceu_formats[k];
1004 xlate->code = code;
1005 xlate++;
1006 dev_dbg(dev, "Providing format %s using code %d\n",
1007 sh_mobile_ceu_formats[k].name, code);
1008 }
1009 break;
1010 default:
1011 if (!sh_mobile_ceu_packing_supported(fmt))
1012 return 0;
1013 }
1014
1015 /* Generic pass-through */
1016 formats++;
1017 if (xlate) {
1018 xlate->host_fmt = fmt;
1019 xlate->code = code;
1020 xlate++;
1021 dev_dbg(dev, "Providing format %s in pass-through mode\n",
1022 fmt->name);
1023 }
1024
1025 return formats;
1026 }
1027
1028 static void sh_mobile_ceu_put_formats(struct soc_camera_device *icd)
1029 {
1030 kfree(icd->host_priv);
1031 icd->host_priv = NULL;
1032 }
1033
1034 /* Check if any dimension of r1 is smaller than respective one of r2 */
1035 static bool is_smaller(struct v4l2_rect *r1, struct v4l2_rect *r2)
1036 {
1037 return r1->width < r2->width || r1->height < r2->height;
1038 }
1039
1040 /* Check if r1 fails to cover r2 */
1041 static bool is_inside(struct v4l2_rect *r1, struct v4l2_rect *r2)
1042 {
1043 return r1->left > r2->left || r1->top > r2->top ||
1044 r1->left + r1->width < r2->left + r2->width ||
1045 r1->top + r1->height < r2->top + r2->height;
1046 }
1047
1048 static unsigned int scale_down(unsigned int size, unsigned int scale)
1049 {
1050 return (size * 4096 + scale / 2) / scale;
1051 }
1052
1053 static unsigned int calc_generic_scale(unsigned int input, unsigned int output)
1054 {
1055 return (input * 4096 + output / 2) / output;
1056 }
1057
1058 /* Get and store current client crop */
1059 static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect)
1060 {
1061 struct v4l2_crop crop;
1062 struct v4l2_cropcap cap;
1063 int ret;
1064
1065 crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1066
1067 ret = v4l2_subdev_call(sd, video, g_crop, &crop);
1068 if (!ret) {
1069 *rect = crop.c;
1070 return ret;
1071 }
1072
1073 /* Camera driver doesn't support .g_crop(), assume default rectangle */
1074 cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1075
1076 ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1077 if (!ret)
1078 *rect = cap.defrect;
1079
1080 return ret;
1081 }
1082
1083 /* Client crop has changed, update our sub-rectangle to remain within the area */
1084 static void update_subrect(struct sh_mobile_ceu_cam *cam)
1085 {
1086 struct v4l2_rect *rect = &cam->rect, *subrect = &cam->subrect;
1087
1088 if (rect->width < subrect->width)
1089 subrect->width = rect->width;
1090
1091 if (rect->height < subrect->height)
1092 subrect->height = rect->height;
1093
1094 if (rect->left > subrect->left)
1095 subrect->left = rect->left;
1096 else if (rect->left + rect->width >
1097 subrect->left + subrect->width)
1098 subrect->left = rect->left + rect->width -
1099 subrect->width;
1100
1101 if (rect->top > subrect->top)
1102 subrect->top = rect->top;
1103 else if (rect->top + rect->height >
1104 subrect->top + subrect->height)
1105 subrect->top = rect->top + rect->height -
1106 subrect->height;
1107 }
1108
1109 /*
1110 * The common for both scaling and cropping iterative approach is:
1111 * 1. try if the client can produce exactly what requested by the user
1112 * 2. if (1) failed, try to double the client image until we get one big enough
1113 * 3. if (2) failed, try to request the maximum image
1114 */
1115 static int client_s_crop(struct soc_camera_device *icd, struct v4l2_crop *crop,
1116 struct v4l2_crop *cam_crop)
1117 {
1118 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1119 struct v4l2_rect *rect = &crop->c, *cam_rect = &cam_crop->c;
1120 struct device *dev = sd->v4l2_dev->dev;
1121 struct sh_mobile_ceu_cam *cam = icd->host_priv;
1122 struct v4l2_cropcap cap;
1123 int ret;
1124 unsigned int width, height;
1125
1126 v4l2_subdev_call(sd, video, s_crop, crop);
1127 ret = client_g_rect(sd, cam_rect);
1128 if (ret < 0)
1129 return ret;
1130
1131 /*
1132 * Now cam_crop contains the current camera input rectangle, and it must
1133 * be within camera cropcap bounds
1134 */
1135 if (!memcmp(rect, cam_rect, sizeof(*rect))) {
1136 /* Even if camera S_CROP failed, but camera rectangle matches */
1137 dev_dbg(dev, "Camera S_CROP successful for %dx%d@%d:%d\n",
1138 rect->width, rect->height, rect->left, rect->top);
1139 cam->rect = *cam_rect;
1140 return 0;
1141 }
1142
1143 /* Try to fix cropping, that camera hasn't managed to set */
1144 dev_geo(dev, "Fix camera S_CROP for %dx%d@%d:%d to %dx%d@%d:%d\n",
1145 cam_rect->width, cam_rect->height,
1146 cam_rect->left, cam_rect->top,
1147 rect->width, rect->height, rect->left, rect->top);
1148
1149 /* We need sensor maximum rectangle */
1150 ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1151 if (ret < 0)
1152 return ret;
1153
1154 /* Put user requested rectangle within sensor bounds */
1155 soc_camera_limit_side(&rect->left, &rect->width, cap.bounds.left, 2,
1156 cap.bounds.width);
1157 soc_camera_limit_side(&rect->top, &rect->height, cap.bounds.top, 4,
1158 cap.bounds.height);
1159
1160 /*
1161 * Popular special case - some cameras can only handle fixed sizes like
1162 * QVGA, VGA,... Take care to avoid infinite loop.
1163 */
1164 width = max(cam_rect->width, 2);
1165 height = max(cam_rect->height, 2);
1166
1167 /*
1168 * Loop as long as sensor is not covering the requested rectangle and
1169 * is still within its bounds
1170 */
1171 while (!ret && (is_smaller(cam_rect, rect) ||
1172 is_inside(cam_rect, rect)) &&
1173 (cap.bounds.width > width || cap.bounds.height > height)) {
1174
1175 width *= 2;
1176 height *= 2;
1177
1178 cam_rect->width = width;
1179 cam_rect->height = height;
1180
1181 /*
1182 * We do not know what capabilities the camera has to set up
1183 * left and top borders. We could try to be smarter in iterating
1184 * them, e.g., if camera current left is to the right of the
1185 * target left, set it to the middle point between the current
1186 * left and minimum left. But that would add too much
1187 * complexity: we would have to iterate each border separately.
1188 * Instead we just drop to the left and top bounds.
1189 */
1190 if (cam_rect->left > rect->left)
1191 cam_rect->left = cap.bounds.left;
1192
1193 if (cam_rect->left + cam_rect->width < rect->left + rect->width)
1194 cam_rect->width = rect->left + rect->width -
1195 cam_rect->left;
1196
1197 if (cam_rect->top > rect->top)
1198 cam_rect->top = cap.bounds.top;
1199
1200 if (cam_rect->top + cam_rect->height < rect->top + rect->height)
1201 cam_rect->height = rect->top + rect->height -
1202 cam_rect->top;
1203
1204 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1205 ret = client_g_rect(sd, cam_rect);
1206 dev_geo(dev, "Camera S_CROP %d for %dx%d@%d:%d\n", ret,
1207 cam_rect->width, cam_rect->height,
1208 cam_rect->left, cam_rect->top);
1209 }
1210
1211 /* S_CROP must not modify the rectangle */
1212 if (is_smaller(cam_rect, rect) || is_inside(cam_rect, rect)) {
1213 /*
1214 * The camera failed to configure a suitable cropping,
1215 * we cannot use the current rectangle, set to max
1216 */
1217 *cam_rect = cap.bounds;
1218 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1219 ret = client_g_rect(sd, cam_rect);
1220 dev_geo(dev, "Camera S_CROP %d for max %dx%d@%d:%d\n", ret,
1221 cam_rect->width, cam_rect->height,
1222 cam_rect->left, cam_rect->top);
1223 }
1224
1225 if (!ret) {
1226 cam->rect = *cam_rect;
1227 update_subrect(cam);
1228 }
1229
1230 return ret;
1231 }
1232
1233 /* Iterative s_mbus_fmt, also updates cached client crop on success */
1234 static int client_s_fmt(struct soc_camera_device *icd,
1235 struct v4l2_mbus_framefmt *mf, bool ceu_can_scale)
1236 {
1237 struct sh_mobile_ceu_cam *cam = icd->host_priv;
1238 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1239 struct device *dev = icd->dev.parent;
1240 unsigned int width = mf->width, height = mf->height, tmp_w, tmp_h;
1241 unsigned int max_width, max_height;
1242 struct v4l2_cropcap cap;
1243 int ret;
1244
1245 ret = v4l2_device_call_until_err(sd->v4l2_dev, 0, video,
1246 s_mbus_fmt, mf);
1247 if (ret < 0)
1248 return ret;
1249
1250 dev_geo(dev, "camera scaled to %ux%u\n", mf->width, mf->height);
1251
1252 if ((width == mf->width && height == mf->height) || !ceu_can_scale)
1253 goto update_cache;
1254
1255 cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1256
1257 ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1258 if (ret < 0)
1259 return ret;
1260
1261 max_width = min(cap.bounds.width, 2560);
1262 max_height = min(cap.bounds.height, 1920);
1263
1264 /* Camera set a format, but geometry is not precise, try to improve */
1265 tmp_w = mf->width;
1266 tmp_h = mf->height;
1267
1268 /* width <= max_width && height <= max_height - guaranteed by try_fmt */
1269 while ((width > tmp_w || height > tmp_h) &&
1270 tmp_w < max_width && tmp_h < max_height) {
1271 tmp_w = min(2 * tmp_w, max_width);
1272 tmp_h = min(2 * tmp_h, max_height);
1273 mf->width = tmp_w;
1274 mf->height = tmp_h;
1275 ret = v4l2_device_call_until_err(sd->v4l2_dev, 0, video,
1276 s_mbus_fmt, mf);
1277 dev_geo(dev, "Camera scaled to %ux%u\n",
1278 mf->width, mf->height);
1279 if (ret < 0) {
1280 /* This shouldn't happen */
1281 dev_err(dev, "Client failed to set format: %d\n", ret);
1282 return ret;
1283 }
1284 }
1285
1286 update_cache:
1287 /* Update cache */
1288 ret = client_g_rect(sd, &cam->rect);
1289 if (ret < 0)
1290 return ret;
1291
1292 update_subrect(cam);
1293
1294 return 0;
1295 }
1296
1297 /**
1298 * @width - on output: user width, mapped back to input
1299 * @height - on output: user height, mapped back to input
1300 * @mf - in- / output camera output window
1301 */
1302 static int client_scale(struct soc_camera_device *icd,
1303 struct v4l2_mbus_framefmt *mf,
1304 unsigned int *width, unsigned int *height,
1305 bool ceu_can_scale)
1306 {
1307 struct sh_mobile_ceu_cam *cam = icd->host_priv;
1308 struct device *dev = icd->dev.parent;
1309 struct v4l2_mbus_framefmt mf_tmp = *mf;
1310 unsigned int scale_h, scale_v;
1311 int ret;
1312
1313 /*
1314 * 5. Apply iterative camera S_FMT for camera user window (also updates
1315 * client crop cache and the imaginary sub-rectangle).
1316 */
1317 ret = client_s_fmt(icd, &mf_tmp, ceu_can_scale);
1318 if (ret < 0)
1319 return ret;
1320
1321 dev_geo(dev, "5: camera scaled to %ux%u\n",
1322 mf_tmp.width, mf_tmp.height);
1323
1324 /* 6. Retrieve camera output window (g_fmt) */
1325
1326 /* unneeded - it is already in "mf_tmp" */
1327
1328 /* 7. Calculate new client scales. */
1329 scale_h = calc_generic_scale(cam->rect.width, mf_tmp.width);
1330 scale_v = calc_generic_scale(cam->rect.height, mf_tmp.height);
1331
1332 mf->width = mf_tmp.width;
1333 mf->height = mf_tmp.height;
1334 mf->colorspace = mf_tmp.colorspace;
1335
1336 /*
1337 * 8. Calculate new CEU crop - apply camera scales to previously
1338 * updated "effective" crop.
1339 */
1340 *width = scale_down(cam->subrect.width, scale_h);
1341 *height = scale_down(cam->subrect.height, scale_v);
1342
1343 dev_geo(dev, "8: new client sub-window %ux%u\n", *width, *height);
1344
1345 return 0;
1346 }
1347
1348 /*
1349 * CEU can scale and crop, but we don't want to waste bandwidth and kill the
1350 * framerate by always requesting the maximum image from the client. See
1351 * Documentation/video4linux/sh_mobile_camera_ceu.txt for a description of
1352 * scaling and cropping algorithms and for the meaning of referenced here steps.
1353 */
1354 static int sh_mobile_ceu_set_crop(struct soc_camera_device *icd,
1355 struct v4l2_crop *a)
1356 {
1357 struct v4l2_rect *rect = &a->c;
1358 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1359 struct sh_mobile_ceu_dev *pcdev = ici->priv;
1360 struct v4l2_crop cam_crop;
1361 struct sh_mobile_ceu_cam *cam = icd->host_priv;
1362 struct v4l2_rect *cam_rect = &cam_crop.c;
1363 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1364 struct device *dev = icd->dev.parent;
1365 struct v4l2_mbus_framefmt mf;
1366 unsigned int scale_cam_h, scale_cam_v, scale_ceu_h, scale_ceu_v,
1367 out_width, out_height, scale_h, scale_v;
1368 int interm_width, interm_height;
1369 u32 capsr, cflcr;
1370 int ret;
1371
1372 dev_geo(dev, "S_CROP(%ux%u@%u:%u)\n", rect->width, rect->height,
1373 rect->left, rect->top);
1374
1375 /* During camera cropping its output window can change too, stop CEU */
1376 capsr = capture_save_reset(pcdev);
1377 dev_dbg(dev, "CAPSR 0x%x, CFLCR 0x%x\n", capsr, pcdev->cflcr);
1378
1379 /* 1. - 2. Apply iterative camera S_CROP for new input window. */
1380 ret = client_s_crop(icd, a, &cam_crop);
1381 if (ret < 0)
1382 return ret;
1383
1384 dev_geo(dev, "1-2: camera cropped to %ux%u@%u:%u\n",
1385 cam_rect->width, cam_rect->height,
1386 cam_rect->left, cam_rect->top);
1387
1388 /* On success cam_crop contains current camera crop */
1389
1390 /* 3. Retrieve camera output window */
1391 ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
1392 if (ret < 0)
1393 return ret;
1394
1395 if (mf.width > 2560 || mf.height > 1920)
1396 return -EINVAL;
1397
1398 /* Cache camera output window */
1399 cam->width = mf.width;
1400 cam->height = mf.height;
1401
1402 /* 4. Calculate camera scales */
1403 scale_cam_h = calc_generic_scale(cam_rect->width, mf.width);
1404 scale_cam_v = calc_generic_scale(cam_rect->height, mf.height);
1405
1406 /* Calculate intermediate window */
1407 interm_width = scale_down(rect->width, scale_cam_h);
1408 interm_height = scale_down(rect->height, scale_cam_v);
1409
1410 if (pcdev->image_mode) {
1411 out_width = min(interm_width, icd->user_width);
1412 out_height = min(interm_height, icd->user_height);
1413 } else {
1414 out_width = interm_width;
1415 out_height = interm_height;
1416 }
1417
1418 /*
1419 * 5. Calculate CEU scales from camera scales from results of (5) and
1420 * the user window
1421 */
1422 scale_ceu_h = calc_scale(interm_width, &out_width);
1423 scale_ceu_v = calc_scale(interm_height, &out_height);
1424
1425 /* Calculate camera scales */
1426 scale_h = calc_generic_scale(cam_rect->width, out_width);
1427 scale_v = calc_generic_scale(cam_rect->height, out_height);
1428
1429 dev_geo(dev, "5: CEU scales %u:%u\n", scale_ceu_h, scale_ceu_v);
1430
1431 /* Apply CEU scales. */
1432 cflcr = scale_ceu_h | (scale_ceu_v << 16);
1433 if (cflcr != pcdev->cflcr) {
1434 pcdev->cflcr = cflcr;
1435 ceu_write(pcdev, CFLCR, cflcr);
1436 }
1437
1438 icd->user_width = out_width;
1439 icd->user_height = out_height;
1440 cam->ceu_left = scale_down(rect->left - cam_rect->left, scale_h) & ~1;
1441 cam->ceu_top = scale_down(rect->top - cam_rect->top, scale_v) & ~1;
1442
1443 /* 6. Use CEU cropping to crop to the new window. */
1444 sh_mobile_ceu_set_rect(icd);
1445
1446 cam->subrect = *rect;
1447
1448 dev_geo(dev, "6: CEU cropped to %ux%u@%u:%u\n",
1449 icd->user_width, icd->user_height,
1450 cam->ceu_left, cam->ceu_top);
1451
1452 /* Restore capture */
1453 if (pcdev->active)
1454 capsr |= 1;
1455 capture_restore(pcdev, capsr);
1456
1457 /* Even if only camera cropping succeeded */
1458 return ret;
1459 }
1460
1461 static int sh_mobile_ceu_get_crop(struct soc_camera_device *icd,
1462 struct v4l2_crop *a)
1463 {
1464 struct sh_mobile_ceu_cam *cam = icd->host_priv;
1465
1466 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1467 a->c = cam->subrect;
1468
1469 return 0;
1470 }
1471
1472 /*
1473 * Calculate real client output window by applying new scales to the current
1474 * client crop. New scales are calculated from the requested output format and
1475 * CEU crop, mapped backed onto the client input (subrect).
1476 */
1477 static void calculate_client_output(struct soc_camera_device *icd,
1478 struct v4l2_pix_format *pix, struct v4l2_mbus_framefmt *mf)
1479 {
1480 struct sh_mobile_ceu_cam *cam = icd->host_priv;
1481 struct device *dev = icd->dev.parent;
1482 struct v4l2_rect *cam_subrect = &cam->subrect;
1483 unsigned int scale_v, scale_h;
1484
1485 if (cam_subrect->width == cam->rect.width &&
1486 cam_subrect->height == cam->rect.height) {
1487 /* No sub-cropping */
1488 mf->width = pix->width;
1489 mf->height = pix->height;
1490 return;
1491 }
1492
1493 /* 1.-2. Current camera scales and subwin - cached. */
1494
1495 dev_geo(dev, "2: subwin %ux%u@%u:%u\n",
1496 cam_subrect->width, cam_subrect->height,
1497 cam_subrect->left, cam_subrect->top);
1498
1499 /*
1500 * 3. Calculate new combined scales from input sub-window to requested
1501 * user window.
1502 */
1503
1504 /*
1505 * TODO: CEU cannot scale images larger than VGA to smaller than SubQCIF
1506 * (128x96) or larger than VGA
1507 */
1508 scale_h = calc_generic_scale(cam_subrect->width, pix->width);
1509 scale_v = calc_generic_scale(cam_subrect->height, pix->height);
1510
1511 dev_geo(dev, "3: scales %u:%u\n", scale_h, scale_v);
1512
1513 /*
1514 * 4. Calculate client output window by applying combined scales to real
1515 * input window.
1516 */
1517 mf->width = scale_down(cam->rect.width, scale_h);
1518 mf->height = scale_down(cam->rect.height, scale_v);
1519 }
1520
1521 /* Similar to set_crop multistage iterative algorithm */
1522 static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
1523 struct v4l2_format *f)
1524 {
1525 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1526 struct sh_mobile_ceu_dev *pcdev = ici->priv;
1527 struct sh_mobile_ceu_cam *cam = icd->host_priv;
1528 struct v4l2_pix_format *pix = &f->fmt.pix;
1529 struct v4l2_mbus_framefmt mf;
1530 struct device *dev = icd->dev.parent;
1531 __u32 pixfmt = pix->pixelformat;
1532 const struct soc_camera_format_xlate *xlate;
1533 /* Keep Compiler Happy */
1534 unsigned int ceu_sub_width = 0, ceu_sub_height = 0;
1535 u16 scale_v, scale_h;
1536 int ret;
1537 bool image_mode;
1538 enum v4l2_field field;
1539
1540 dev_geo(dev, "S_FMT(pix=0x%x, %ux%u)\n", pixfmt, pix->width, pix->height);
1541
1542 switch (pix->field) {
1543 default:
1544 pix->field = V4L2_FIELD_NONE;
1545 /* fall-through */
1546 case V4L2_FIELD_INTERLACED_TB:
1547 case V4L2_FIELD_INTERLACED_BT:
1548 case V4L2_FIELD_NONE:
1549 field = pix->field;
1550 break;
1551 case V4L2_FIELD_INTERLACED:
1552 field = V4L2_FIELD_INTERLACED_TB;
1553 break;
1554 }
1555
1556 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1557 if (!xlate) {
1558 dev_warn(dev, "Format %x not found\n", pixfmt);
1559 return -EINVAL;
1560 }
1561
1562 /* 1.-4. Calculate client output geometry */
1563 calculate_client_output(icd, &f->fmt.pix, &mf);
1564 mf.field = pix->field;
1565 mf.colorspace = pix->colorspace;
1566 mf.code = xlate->code;
1567
1568 switch (pixfmt) {
1569 case V4L2_PIX_FMT_NV12:
1570 case V4L2_PIX_FMT_NV21:
1571 case V4L2_PIX_FMT_NV16:
1572 case V4L2_PIX_FMT_NV61:
1573 image_mode = true;
1574 break;
1575 default:
1576 image_mode = false;
1577 }
1578
1579 dev_geo(dev, "4: request camera output %ux%u\n", mf.width, mf.height);
1580
1581 /* 5. - 9. */
1582 ret = client_scale(icd, &mf, &ceu_sub_width, &ceu_sub_height,
1583 image_mode && V4L2_FIELD_NONE == field);
1584
1585 dev_geo(dev, "5-9: client scale return %d\n", ret);
1586
1587 /* Done with the camera. Now see if we can improve the result */
1588
1589 dev_geo(dev, "fmt %ux%u, requested %ux%u\n",
1590 mf.width, mf.height, pix->width, pix->height);
1591 if (ret < 0)
1592 return ret;
1593
1594 if (mf.code != xlate->code)
1595 return -EINVAL;
1596
1597 /* 9. Prepare CEU crop */
1598 cam->width = mf.width;
1599 cam->height = mf.height;
1600
1601 /* 10. Use CEU scaling to scale to the requested user window. */
1602
1603 /* We cannot scale up */
1604 if (pix->width > ceu_sub_width)
1605 ceu_sub_width = pix->width;
1606
1607 if (pix->height > ceu_sub_height)
1608 ceu_sub_height = pix->height;
1609
1610 pix->colorspace = mf.colorspace;
1611
1612 if (image_mode) {
1613 /* Scale pix->{width x height} down to width x height */
1614 scale_h = calc_scale(ceu_sub_width, &pix->width);
1615 scale_v = calc_scale(ceu_sub_height, &pix->height);
1616 } else {
1617 pix->width = ceu_sub_width;
1618 pix->height = ceu_sub_height;
1619 scale_h = 0;
1620 scale_v = 0;
1621 }
1622
1623 pcdev->cflcr = scale_h | (scale_v << 16);
1624
1625 /*
1626 * We have calculated CFLCR, the actual configuration will be performed
1627 * in sh_mobile_ceu_set_bus_param()
1628 */
1629
1630 dev_geo(dev, "10: W: %u : 0x%x = %u, H: %u : 0x%x = %u\n",
1631 ceu_sub_width, scale_h, pix->width,
1632 ceu_sub_height, scale_v, pix->height);
1633
1634 cam->code = xlate->code;
1635 icd->current_fmt = xlate;
1636
1637 pcdev->field = field;
1638 pcdev->image_mode = image_mode;
1639
1640 return 0;
1641 }
1642
1643 static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
1644 struct v4l2_format *f)
1645 {
1646 const struct soc_camera_format_xlate *xlate;
1647 struct v4l2_pix_format *pix = &f->fmt.pix;
1648 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1649 struct v4l2_mbus_framefmt mf;
1650 __u32 pixfmt = pix->pixelformat;
1651 int width, height;
1652 int ret;
1653
1654 dev_geo(icd->dev.parent, "TRY_FMT(pix=0x%x, %ux%u)\n",
1655 pixfmt, pix->width, pix->height);
1656
1657 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1658 if (!xlate) {
1659 dev_warn(icd->dev.parent, "Format %x not found\n", pixfmt);
1660 return -EINVAL;
1661 }
1662
1663 /* FIXME: calculate using depth and bus width */
1664
1665 v4l_bound_align_image(&pix->width, 2, 2560, 1,
1666 &pix->height, 4, 1920, 2, 0);
1667
1668 width = pix->width;
1669 height = pix->height;
1670
1671 pix->bytesperline = soc_mbus_bytes_per_line(width, xlate->host_fmt);
1672 if ((int)pix->bytesperline < 0)
1673 return pix->bytesperline;
1674 pix->sizeimage = height * pix->bytesperline;
1675
1676 /* limit to sensor capabilities */
1677 mf.width = pix->width;
1678 mf.height = pix->height;
1679 mf.field = pix->field;
1680 mf.code = xlate->code;
1681 mf.colorspace = pix->colorspace;
1682
1683 ret = v4l2_device_call_until_err(sd->v4l2_dev, 0, video, try_mbus_fmt, &mf);
1684 if (ret < 0)
1685 return ret;
1686
1687 pix->width = mf.width;
1688 pix->height = mf.height;
1689 pix->field = mf.field;
1690 pix->colorspace = mf.colorspace;
1691
1692 switch (pixfmt) {
1693 case V4L2_PIX_FMT_NV12:
1694 case V4L2_PIX_FMT_NV21:
1695 case V4L2_PIX_FMT_NV16:
1696 case V4L2_PIX_FMT_NV61:
1697 /* FIXME: check against rect_max after converting soc-camera */
1698 /* We can scale precisely, need a bigger image from camera */
1699 if (pix->width < width || pix->height < height) {
1700 /*
1701 * We presume, the sensor behaves sanely, i.e., if
1702 * requested a bigger rectangle, it will not return a
1703 * smaller one.
1704 */
1705 mf.width = 2560;
1706 mf.height = 1920;
1707 ret = v4l2_device_call_until_err(sd->v4l2_dev, 0, video,
1708 try_mbus_fmt, &mf);
1709 if (ret < 0) {
1710 /* Shouldn't actually happen... */
1711 dev_err(icd->dev.parent,
1712 "FIXME: client try_fmt() = %d\n", ret);
1713 return ret;
1714 }
1715 }
1716 /* We will scale exactly */
1717 if (mf.width > width)
1718 pix->width = width;
1719 if (mf.height > height)
1720 pix->height = height;
1721 }
1722
1723 dev_geo(icd->dev.parent, "%s(): return %d, fmt 0x%x, %ux%u\n",
1724 __func__, ret, pix->pixelformat, pix->width, pix->height);
1725
1726 return ret;
1727 }
1728
1729 static int sh_mobile_ceu_reqbufs(struct soc_camera_device *icd,
1730 struct v4l2_requestbuffers *p)
1731 {
1732 int i;
1733
1734 /*
1735 * This is for locking debugging only. I removed spinlocks and now I
1736 * check whether .prepare is ever called on a linked buffer, or whether
1737 * a dma IRQ can occur for an in-work or unlinked buffer. Until now
1738 * it hadn't triggered
1739 */
1740 for (i = 0; i < p->count; i++) {
1741 struct sh_mobile_ceu_buffer *buf;
1742
1743 buf = container_of(icd->vb_vidq.bufs[i],
1744 struct sh_mobile_ceu_buffer, vb);
1745 INIT_LIST_HEAD(&buf->vb.queue);
1746 }
1747
1748 return 0;
1749 }
1750
1751 static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
1752 {
1753 struct soc_camera_device *icd = file->private_data;
1754 struct sh_mobile_ceu_buffer *buf;
1755
1756 buf = list_entry(icd->vb_vidq.stream.next,
1757 struct sh_mobile_ceu_buffer, vb.stream);
1758
1759 poll_wait(file, &buf->vb.done, pt);
1760
1761 if (buf->vb.state == VIDEOBUF_DONE ||
1762 buf->vb.state == VIDEOBUF_ERROR)
1763 return POLLIN|POLLRDNORM;
1764
1765 return 0;
1766 }
1767
1768 static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
1769 struct v4l2_capability *cap)
1770 {
1771 strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
1772 cap->version = KERNEL_VERSION(0, 0, 5);
1773 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1774 return 0;
1775 }
1776
1777 static void sh_mobile_ceu_init_videobuf(struct videobuf_queue *q,
1778 struct soc_camera_device *icd)
1779 {
1780 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1781 struct sh_mobile_ceu_dev *pcdev = ici->priv;
1782
1783 videobuf_queue_dma_contig_init(q,
1784 &sh_mobile_ceu_videobuf_ops,
1785 icd->dev.parent, &pcdev->lock,
1786 V4L2_BUF_TYPE_VIDEO_CAPTURE,
1787 pcdev->field,
1788 sizeof(struct sh_mobile_ceu_buffer),
1789 icd, &icd->video_lock);
1790 }
1791
1792 static int sh_mobile_ceu_get_ctrl(struct soc_camera_device *icd,
1793 struct v4l2_control *ctrl)
1794 {
1795 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1796 struct sh_mobile_ceu_dev *pcdev = ici->priv;
1797 u32 val;
1798
1799 switch (ctrl->id) {
1800 case V4L2_CID_SHARPNESS:
1801 val = ceu_read(pcdev, CLFCR);
1802 ctrl->value = val ^ 1;
1803 return 0;
1804 }
1805 return -ENOIOCTLCMD;
1806 }
1807
1808 static int sh_mobile_ceu_set_ctrl(struct soc_camera_device *icd,
1809 struct v4l2_control *ctrl)
1810 {
1811 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1812 struct sh_mobile_ceu_dev *pcdev = ici->priv;
1813
1814 switch (ctrl->id) {
1815 case V4L2_CID_SHARPNESS:
1816 switch (icd->current_fmt->host_fmt->fourcc) {
1817 case V4L2_PIX_FMT_NV12:
1818 case V4L2_PIX_FMT_NV21:
1819 case V4L2_PIX_FMT_NV16:
1820 case V4L2_PIX_FMT_NV61:
1821 ceu_write(pcdev, CLFCR, !ctrl->value);
1822 return 0;
1823 }
1824 return -EINVAL;
1825 }
1826 return -ENOIOCTLCMD;
1827 }
1828
1829 static const struct v4l2_queryctrl sh_mobile_ceu_controls[] = {
1830 {
1831 .id = V4L2_CID_SHARPNESS,
1832 .type = V4L2_CTRL_TYPE_BOOLEAN,
1833 .name = "Low-pass filter",
1834 .minimum = 0,
1835 .maximum = 1,
1836 .step = 1,
1837 .default_value = 0,
1838 },
1839 };
1840
1841 static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
1842 .owner = THIS_MODULE,
1843 .add = sh_mobile_ceu_add_device,
1844 .remove = sh_mobile_ceu_remove_device,
1845 .get_formats = sh_mobile_ceu_get_formats,
1846 .put_formats = sh_mobile_ceu_put_formats,
1847 .get_crop = sh_mobile_ceu_get_crop,
1848 .set_crop = sh_mobile_ceu_set_crop,
1849 .set_fmt = sh_mobile_ceu_set_fmt,
1850 .try_fmt = sh_mobile_ceu_try_fmt,
1851 .set_ctrl = sh_mobile_ceu_set_ctrl,
1852 .get_ctrl = sh_mobile_ceu_get_ctrl,
1853 .reqbufs = sh_mobile_ceu_reqbufs,
1854 .poll = sh_mobile_ceu_poll,
1855 .querycap = sh_mobile_ceu_querycap,
1856 .set_bus_param = sh_mobile_ceu_set_bus_param,
1857 .init_videobuf = sh_mobile_ceu_init_videobuf,
1858 .controls = sh_mobile_ceu_controls,
1859 .num_controls = ARRAY_SIZE(sh_mobile_ceu_controls),
1860 };
1861
1862 struct bus_wait {
1863 struct notifier_block notifier;
1864 struct completion completion;
1865 struct device *dev;
1866 };
1867
1868 static int bus_notify(struct notifier_block *nb,
1869 unsigned long action, void *data)
1870 {
1871 struct device *dev = data;
1872 struct bus_wait *wait = container_of(nb, struct bus_wait, notifier);
1873
1874 if (wait->dev != dev)
1875 return NOTIFY_DONE;
1876
1877 switch (action) {
1878 case BUS_NOTIFY_UNBOUND_DRIVER:
1879 /* Protect from module unloading */
1880 wait_for_completion(&wait->completion);
1881 return NOTIFY_OK;
1882 }
1883 return NOTIFY_DONE;
1884 }
1885
1886 static int __devinit sh_mobile_ceu_probe(struct platform_device *pdev)
1887 {
1888 struct sh_mobile_ceu_dev *pcdev;
1889 struct resource *res;
1890 void __iomem *base;
1891 unsigned int irq;
1892 int err = 0;
1893 struct bus_wait wait = {
1894 .completion = COMPLETION_INITIALIZER_ONSTACK(wait.completion),
1895 .notifier.notifier_call = bus_notify,
1896 };
1897 struct device *csi2;
1898
1899 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1900 irq = platform_get_irq(pdev, 0);
1901 if (!res || (int)irq <= 0) {
1902 dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
1903 err = -ENODEV;
1904 goto exit;
1905 }
1906
1907 pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
1908 if (!pcdev) {
1909 dev_err(&pdev->dev, "Could not allocate pcdev\n");
1910 err = -ENOMEM;
1911 goto exit;
1912 }
1913
1914 INIT_LIST_HEAD(&pcdev->capture);
1915 spin_lock_init(&pcdev->lock);
1916
1917 pcdev->pdata = pdev->dev.platform_data;
1918 if (!pcdev->pdata) {
1919 err = -EINVAL;
1920 dev_err(&pdev->dev, "CEU platform data not set.\n");
1921 goto exit_kfree;
1922 }
1923
1924 base = ioremap_nocache(res->start, resource_size(res));
1925 if (!base) {
1926 err = -ENXIO;
1927 dev_err(&pdev->dev, "Unable to ioremap CEU registers.\n");
1928 goto exit_kfree;
1929 }
1930
1931 pcdev->irq = irq;
1932 pcdev->base = base;
1933 pcdev->video_limit = 0; /* only enabled if second resource exists */
1934
1935 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1936 if (res) {
1937 err = dma_declare_coherent_memory(&pdev->dev, res->start,
1938 res->start,
1939 resource_size(res),
1940 DMA_MEMORY_MAP |
1941 DMA_MEMORY_EXCLUSIVE);
1942 if (!err) {
1943 dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
1944 err = -ENXIO;
1945 goto exit_iounmap;
1946 }
1947
1948 pcdev->video_limit = resource_size(res);
1949 }
1950
1951 /* request irq */
1952 err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED,
1953 dev_name(&pdev->dev), pcdev);
1954 if (err) {
1955 dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
1956 goto exit_release_mem;
1957 }
1958
1959 pm_suspend_ignore_children(&pdev->dev, true);
1960 pm_runtime_enable(&pdev->dev);
1961 pm_runtime_resume(&pdev->dev);
1962
1963 pcdev->ici.priv = pcdev;
1964 pcdev->ici.v4l2_dev.dev = &pdev->dev;
1965 pcdev->ici.nr = pdev->id;
1966 pcdev->ici.drv_name = dev_name(&pdev->dev);
1967 pcdev->ici.ops = &sh_mobile_ceu_host_ops;
1968
1969 /* CSI2 interfacing */
1970 csi2 = pcdev->pdata->csi2_dev;
1971 if (csi2) {
1972 wait.dev = csi2;
1973
1974 err = bus_register_notifier(&platform_bus_type, &wait.notifier);
1975 if (err < 0)
1976 goto exit_free_clk;
1977
1978 /*
1979 * From this point the driver module will not unload, until
1980 * we complete the completion.
1981 */
1982
1983 if (!csi2->driver) {
1984 complete(&wait.completion);
1985 /* Either too late, or probing failed */
1986 bus_unregister_notifier(&platform_bus_type, &wait.notifier);
1987 err = -ENXIO;
1988 goto exit_free_clk;
1989 }
1990
1991 /*
1992 * The module is still loaded, in the worst case it is hanging
1993 * in device release on our completion. So, _now_ dereferencing
1994 * the "owner" is safe!
1995 */
1996
1997 err = try_module_get(csi2->driver->owner);
1998
1999 /* Let notifier complete, if it has been locked */
2000 complete(&wait.completion);
2001 bus_unregister_notifier(&platform_bus_type, &wait.notifier);
2002 if (!err) {
2003 err = -ENODEV;
2004 goto exit_free_clk;
2005 }
2006 }
2007
2008 err = soc_camera_host_register(&pcdev->ici);
2009 if (err)
2010 goto exit_module_put;
2011
2012 return 0;
2013
2014 exit_module_put:
2015 if (csi2 && csi2->driver)
2016 module_put(csi2->driver->owner);
2017 exit_free_clk:
2018 pm_runtime_disable(&pdev->dev);
2019 free_irq(pcdev->irq, pcdev);
2020 exit_release_mem:
2021 if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
2022 dma_release_declared_memory(&pdev->dev);
2023 exit_iounmap:
2024 iounmap(base);
2025 exit_kfree:
2026 kfree(pcdev);
2027 exit:
2028 return err;
2029 }
2030
2031 static int __devexit sh_mobile_ceu_remove(struct platform_device *pdev)
2032 {
2033 struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
2034 struct sh_mobile_ceu_dev *pcdev = container_of(soc_host,
2035 struct sh_mobile_ceu_dev, ici);
2036 struct device *csi2 = pcdev->pdata->csi2_dev;
2037
2038 soc_camera_host_unregister(soc_host);
2039 pm_runtime_disable(&pdev->dev);
2040 free_irq(pcdev->irq, pcdev);
2041 if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
2042 dma_release_declared_memory(&pdev->dev);
2043 iounmap(pcdev->base);
2044 if (csi2 && csi2->driver)
2045 module_put(csi2->driver->owner);
2046 kfree(pcdev);
2047
2048 return 0;
2049 }
2050
2051 static int sh_mobile_ceu_runtime_nop(struct device *dev)
2052 {
2053 /* Runtime PM callback shared between ->runtime_suspend()
2054 * and ->runtime_resume(). Simply returns success.
2055 *
2056 * This driver re-initializes all registers after
2057 * pm_runtime_get_sync() anyway so there is no need
2058 * to save and restore registers here.
2059 */
2060 return 0;
2061 }
2062
2063 static const struct dev_pm_ops sh_mobile_ceu_dev_pm_ops = {
2064 .runtime_suspend = sh_mobile_ceu_runtime_nop,
2065 .runtime_resume = sh_mobile_ceu_runtime_nop,
2066 };
2067
2068 static struct platform_driver sh_mobile_ceu_driver = {
2069 .driver = {
2070 .name = "sh_mobile_ceu",
2071 .pm = &sh_mobile_ceu_dev_pm_ops,
2072 },
2073 .probe = sh_mobile_ceu_probe,
2074 .remove = __devexit_p(sh_mobile_ceu_remove),
2075 };
2076
2077 static int __init sh_mobile_ceu_init(void)
2078 {
2079 /* Whatever return code */
2080 request_module("sh_mobile_csi2");
2081 return platform_driver_register(&sh_mobile_ceu_driver);
2082 }
2083
2084 static void __exit sh_mobile_ceu_exit(void)
2085 {
2086 platform_driver_unregister(&sh_mobile_ceu_driver);
2087 }
2088
2089 module_init(sh_mobile_ceu_init);
2090 module_exit(sh_mobile_ceu_exit);
2091
2092 MODULE_DESCRIPTION("SuperH Mobile CEU driver");
2093 MODULE_AUTHOR("Magnus Damm");
2094 MODULE_LICENSE("GPL");
2095 MODULE_ALIAS("platform:sh_mobile_ceu");