[media] v4l: soc-camera: switch to .unlocked_ioctl
[linux-2.6.git] / drivers / media / video / sh_mobile_ceu_camera.c
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");