V4L/DVB: mx1-camera: compile fix
[kernel.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         struct v4l2_rect ceu_rect;
119         unsigned int cam_width;
120         unsigned int cam_height;
121         const struct soc_mbus_pixelfmt *extra_fmt;
122         enum v4l2_mbus_pixelcode code;
123 };
124
125 static unsigned long make_bus_param(struct sh_mobile_ceu_dev *pcdev)
126 {
127         unsigned long flags;
128
129         flags = SOCAM_MASTER |
130                 SOCAM_PCLK_SAMPLE_RISING |
131                 SOCAM_HSYNC_ACTIVE_HIGH |
132                 SOCAM_HSYNC_ACTIVE_LOW |
133                 SOCAM_VSYNC_ACTIVE_HIGH |
134                 SOCAM_VSYNC_ACTIVE_LOW |
135                 SOCAM_DATA_ACTIVE_HIGH;
136
137         if (pcdev->pdata->flags & SH_CEU_FLAG_USE_8BIT_BUS)
138                 flags |= SOCAM_DATAWIDTH_8;
139
140         if (pcdev->pdata->flags & SH_CEU_FLAG_USE_16BIT_BUS)
141                 flags |= SOCAM_DATAWIDTH_16;
142
143         if (flags & SOCAM_DATAWIDTH_MASK)
144                 return flags;
145
146         return 0;
147 }
148
149 static void ceu_write(struct sh_mobile_ceu_dev *priv,
150                       unsigned long reg_offs, u32 data)
151 {
152         iowrite32(data, priv->base + reg_offs);
153 }
154
155 static u32 ceu_read(struct sh_mobile_ceu_dev *priv, unsigned long reg_offs)
156 {
157         return ioread32(priv->base + reg_offs);
158 }
159
160 static int sh_mobile_ceu_soft_reset(struct sh_mobile_ceu_dev *pcdev)
161 {
162         int i, success = 0;
163         struct soc_camera_device *icd = pcdev->icd;
164
165         ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
166
167         /* wait CSTSR.CPTON bit */
168         for (i = 0; i < 1000; i++) {
169                 if (!(ceu_read(pcdev, CSTSR) & 1)) {
170                         success++;
171                         break;
172                 }
173                 udelay(1);
174         }
175
176         /* wait CAPSR.CPKIL bit */
177         for (i = 0; i < 1000; i++) {
178                 if (!(ceu_read(pcdev, CAPSR) & (1 << 16))) {
179                         success++;
180                         break;
181                 }
182                 udelay(1);
183         }
184
185
186         if (2 != success) {
187                 dev_warn(&icd->dev, "soft reset time out\n");
188                 return -EIO;
189         }
190
191         return 0;
192 }
193
194 /*
195  *  Videobuf operations
196  */
197 static int sh_mobile_ceu_videobuf_setup(struct videobuf_queue *vq,
198                                         unsigned int *count,
199                                         unsigned int *size)
200 {
201         struct soc_camera_device *icd = vq->priv_data;
202         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
203         struct sh_mobile_ceu_dev *pcdev = ici->priv;
204         int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
205                                                 icd->current_fmt->host_fmt);
206
207         if (bytes_per_line < 0)
208                 return bytes_per_line;
209
210         *size = bytes_per_line * icd->user_height;
211
212         if (0 == *count)
213                 *count = 2;
214
215         if (pcdev->video_limit) {
216                 while (PAGE_ALIGN(*size) * *count > pcdev->video_limit)
217                         (*count)--;
218         }
219
220         dev_dbg(icd->dev.parent, "count=%d, size=%d\n", *count, *size);
221
222         return 0;
223 }
224
225 static void free_buffer(struct videobuf_queue *vq,
226                         struct sh_mobile_ceu_buffer *buf)
227 {
228         struct soc_camera_device *icd = vq->priv_data;
229         struct device *dev = icd->dev.parent;
230
231         dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
232                 &buf->vb, buf->vb.baddr, buf->vb.bsize);
233
234         if (in_interrupt())
235                 BUG();
236
237         videobuf_waiton(&buf->vb, 0, 0);
238         videobuf_dma_contig_free(vq, &buf->vb);
239         dev_dbg(dev, "%s freed\n", __func__);
240         buf->vb.state = VIDEOBUF_NEEDS_INIT;
241 }
242
243 #define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */
244 #define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */
245 #define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */
246 #define CEU_CEIER_VBP   (1 << 20) /* vbp error */
247 #define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */
248 #define CEU_CEIER_MASK (CEU_CEIER_CPEIE | CEU_CEIER_VBP)
249
250
251 /*
252  * return value doesn't reflex the success/failure to queue the new buffer,
253  * but rather the status of the previous buffer.
254  */
255 static int sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
256 {
257         struct soc_camera_device *icd = pcdev->icd;
258         dma_addr_t phys_addr_top, phys_addr_bottom;
259         unsigned long top1, top2;
260         unsigned long bottom1, bottom2;
261         u32 status;
262         int ret = 0;
263
264         /*
265          * The hardware is _very_ picky about this sequence. Especially
266          * the CEU_CETCR_MAGIC value. It seems like we need to acknowledge
267          * several not-so-well documented interrupt sources in CETCR.
268          */
269         ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_MASK);
270         status = ceu_read(pcdev, CETCR);
271         ceu_write(pcdev, CETCR, ~status & CEU_CETCR_MAGIC);
272         ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_MASK);
273         ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP);
274         ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW);
275
276         /*
277          * When a VBP interrupt occurs, a capture end interrupt does not occur
278          * and the image of that frame is not captured correctly. So, soft reset
279          * is needed here.
280          */
281         if (status & CEU_CEIER_VBP) {
282                 sh_mobile_ceu_soft_reset(pcdev);
283                 ret = -EIO;
284         }
285
286         if (!pcdev->active)
287                 return ret;
288
289         if (V4L2_FIELD_INTERLACED_BT == pcdev->field) {
290                 top1    = CDBYR;
291                 top2    = CDBCR;
292                 bottom1 = CDAYR;
293                 bottom2 = CDACR;
294         } else {
295                 top1    = CDAYR;
296                 top2    = CDACR;
297                 bottom1 = CDBYR;
298                 bottom2 = CDBCR;
299         }
300
301         phys_addr_top = videobuf_to_dma_contig(pcdev->active);
302         ceu_write(pcdev, top1, phys_addr_top);
303         if (V4L2_FIELD_NONE != pcdev->field) {
304                 phys_addr_bottom = phys_addr_top + icd->user_width;
305                 ceu_write(pcdev, bottom1, phys_addr_bottom);
306         }
307
308         switch (icd->current_fmt->host_fmt->fourcc) {
309         case V4L2_PIX_FMT_NV12:
310         case V4L2_PIX_FMT_NV21:
311         case V4L2_PIX_FMT_NV16:
312         case V4L2_PIX_FMT_NV61:
313                 phys_addr_top += icd->user_width *
314                         icd->user_height;
315                 ceu_write(pcdev, top2, phys_addr_top);
316                 if (V4L2_FIELD_NONE != pcdev->field) {
317                         phys_addr_bottom = phys_addr_top + icd->user_width;
318                         ceu_write(pcdev, bottom2, phys_addr_bottom);
319                 }
320         }
321
322         pcdev->active->state = VIDEOBUF_ACTIVE;
323         ceu_write(pcdev, CAPSR, 0x1); /* start capture */
324
325         return ret;
326 }
327
328 static int sh_mobile_ceu_videobuf_prepare(struct videobuf_queue *vq,
329                                           struct videobuf_buffer *vb,
330                                           enum v4l2_field field)
331 {
332         struct soc_camera_device *icd = vq->priv_data;
333         struct sh_mobile_ceu_buffer *buf;
334         int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
335                                                 icd->current_fmt->host_fmt);
336         int ret;
337
338         if (bytes_per_line < 0)
339                 return bytes_per_line;
340
341         buf = container_of(vb, struct sh_mobile_ceu_buffer, vb);
342
343         dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
344                 vb, vb->baddr, vb->bsize);
345
346         /* Added list head initialization on alloc */
347         WARN_ON(!list_empty(&vb->queue));
348
349 #ifdef DEBUG
350         /*
351          * This can be useful if you want to see if we actually fill
352          * the buffer with something
353          */
354         memset((void *)vb->baddr, 0xaa, vb->bsize);
355 #endif
356
357         BUG_ON(NULL == icd->current_fmt);
358
359         if (buf->code   != icd->current_fmt->code ||
360             vb->width   != icd->user_width ||
361             vb->height  != icd->user_height ||
362             vb->field   != field) {
363                 buf->code       = icd->current_fmt->code;
364                 vb->width       = icd->user_width;
365                 vb->height      = icd->user_height;
366                 vb->field       = field;
367                 vb->state       = VIDEOBUF_NEEDS_INIT;
368         }
369
370         vb->size = vb->height * bytes_per_line;
371         if (0 != vb->baddr && vb->bsize < vb->size) {
372                 ret = -EINVAL;
373                 goto out;
374         }
375
376         if (vb->state == VIDEOBUF_NEEDS_INIT) {
377                 ret = videobuf_iolock(vq, vb, NULL);
378                 if (ret)
379                         goto fail;
380                 vb->state = VIDEOBUF_PREPARED;
381         }
382
383         return 0;
384 fail:
385         free_buffer(vq, buf);
386 out:
387         return ret;
388 }
389
390 /* Called under spinlock_irqsave(&pcdev->lock, ...) */
391 static void sh_mobile_ceu_videobuf_queue(struct videobuf_queue *vq,
392                                          struct videobuf_buffer *vb)
393 {
394         struct soc_camera_device *icd = vq->priv_data;
395         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
396         struct sh_mobile_ceu_dev *pcdev = ici->priv;
397
398         dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
399                 vb, vb->baddr, vb->bsize);
400
401         vb->state = VIDEOBUF_QUEUED;
402         list_add_tail(&vb->queue, &pcdev->capture);
403
404         if (!pcdev->active) {
405                 /*
406                  * Because there were no active buffer at this moment,
407                  * we are not interested in the return value of
408                  * sh_mobile_ceu_capture here.
409                  */
410                 pcdev->active = vb;
411                 sh_mobile_ceu_capture(pcdev);
412         }
413 }
414
415 static void sh_mobile_ceu_videobuf_release(struct videobuf_queue *vq,
416                                            struct videobuf_buffer *vb)
417 {
418         struct soc_camera_device *icd = vq->priv_data;
419         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
420         struct sh_mobile_ceu_dev *pcdev = ici->priv;
421         unsigned long flags;
422
423         spin_lock_irqsave(&pcdev->lock, flags);
424
425         if (pcdev->active == vb) {
426                 /* disable capture (release DMA buffer), reset */
427                 ceu_write(pcdev, CAPSR, 1 << 16);
428                 pcdev->active = NULL;
429         }
430
431         if ((vb->state == VIDEOBUF_ACTIVE || vb->state == VIDEOBUF_QUEUED) &&
432             !list_empty(&vb->queue)) {
433                 vb->state = VIDEOBUF_ERROR;
434                 list_del_init(&vb->queue);
435         }
436
437         spin_unlock_irqrestore(&pcdev->lock, flags);
438
439         free_buffer(vq, container_of(vb, struct sh_mobile_ceu_buffer, vb));
440 }
441
442 static struct videobuf_queue_ops sh_mobile_ceu_videobuf_ops = {
443         .buf_setup      = sh_mobile_ceu_videobuf_setup,
444         .buf_prepare    = sh_mobile_ceu_videobuf_prepare,
445         .buf_queue      = sh_mobile_ceu_videobuf_queue,
446         .buf_release    = sh_mobile_ceu_videobuf_release,
447 };
448
449 static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
450 {
451         struct sh_mobile_ceu_dev *pcdev = data;
452         struct videobuf_buffer *vb;
453         unsigned long flags;
454
455         spin_lock_irqsave(&pcdev->lock, flags);
456
457         vb = pcdev->active;
458         if (!vb)
459                 /* Stale interrupt from a released buffer */
460                 goto out;
461
462         list_del_init(&vb->queue);
463
464         if (!list_empty(&pcdev->capture))
465                 pcdev->active = list_entry(pcdev->capture.next,
466                                            struct videobuf_buffer, queue);
467         else
468                 pcdev->active = NULL;
469
470         vb->state = (sh_mobile_ceu_capture(pcdev) < 0) ?
471                 VIDEOBUF_ERROR : VIDEOBUF_DONE;
472         do_gettimeofday(&vb->ts);
473         vb->field_count++;
474         wake_up(&vb->done);
475
476 out:
477         spin_unlock_irqrestore(&pcdev->lock, flags);
478
479         return IRQ_HANDLED;
480 }
481
482 /* Called with .video_lock held */
483 static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
484 {
485         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
486         struct sh_mobile_ceu_dev *pcdev = ici->priv;
487         int ret;
488
489         if (pcdev->icd)
490                 return -EBUSY;
491
492         dev_info(icd->dev.parent,
493                  "SuperH Mobile CEU driver attached to camera %d\n",
494                  icd->devnum);
495
496         pm_runtime_get_sync(ici->v4l2_dev.dev);
497
498         ret = sh_mobile_ceu_soft_reset(pcdev);
499         if (!ret)
500                 pcdev->icd = icd;
501
502         return ret;
503 }
504
505 /* Called with .video_lock held */
506 static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
507 {
508         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
509         struct sh_mobile_ceu_dev *pcdev = ici->priv;
510         unsigned long flags;
511
512         BUG_ON(icd != pcdev->icd);
513
514         /* disable capture, disable interrupts */
515         ceu_write(pcdev, CEIER, 0);
516         sh_mobile_ceu_soft_reset(pcdev);
517
518         /* make sure active buffer is canceled */
519         spin_lock_irqsave(&pcdev->lock, flags);
520         if (pcdev->active) {
521                 list_del(&pcdev->active->queue);
522                 pcdev->active->state = VIDEOBUF_ERROR;
523                 wake_up_all(&pcdev->active->done);
524                 pcdev->active = NULL;
525         }
526         spin_unlock_irqrestore(&pcdev->lock, flags);
527
528         pm_runtime_put_sync(ici->v4l2_dev.dev);
529
530         dev_info(icd->dev.parent,
531                  "SuperH Mobile CEU driver detached from camera %d\n",
532                  icd->devnum);
533
534         pcdev->icd = NULL;
535 }
536
537 /*
538  * See chapter 29.4.12 "Capture Filter Control Register (CFLCR)"
539  * in SH7722 Hardware Manual
540  */
541 static unsigned int size_dst(unsigned int src, unsigned int scale)
542 {
543         unsigned int mant_pre = scale >> 12;
544         if (!src || !scale)
545                 return src;
546         return ((mant_pre + 2 * (src - 1)) / (2 * mant_pre) - 1) *
547                 mant_pre * 4096 / scale + 1;
548 }
549
550 static u16 calc_scale(unsigned int src, unsigned int *dst)
551 {
552         u16 scale;
553
554         if (src == *dst)
555                 return 0;
556
557         scale = (src * 4096 / *dst) & ~7;
558
559         while (scale > 4096 && size_dst(src, scale) < *dst)
560                 scale -= 8;
561
562         *dst = size_dst(src, scale);
563
564         return scale;
565 }
566
567 /* rect is guaranteed to not exceed the scaled camera rectangle */
568 static void sh_mobile_ceu_set_rect(struct soc_camera_device *icd,
569                                    unsigned int out_width,
570                                    unsigned int out_height)
571 {
572         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
573         struct sh_mobile_ceu_cam *cam = icd->host_priv;
574         struct v4l2_rect *rect = &cam->ceu_rect;
575         struct sh_mobile_ceu_dev *pcdev = ici->priv;
576         unsigned int height, width, cdwdr_width, in_width, in_height;
577         unsigned int left_offset, top_offset;
578         u32 camor;
579
580         dev_dbg(icd->dev.parent, "Crop %ux%u@%u:%u\n",
581                 rect->width, rect->height, rect->left, rect->top);
582
583         left_offset     = rect->left;
584         top_offset      = rect->top;
585
586         if (pcdev->image_mode) {
587                 in_width = rect->width;
588                 if (!pcdev->is_16bit) {
589                         in_width *= 2;
590                         left_offset *= 2;
591                 }
592                 width = out_width;
593                 cdwdr_width = out_width;
594         } else {
595                 int bytes_per_line = soc_mbus_bytes_per_line(out_width,
596                                                 icd->current_fmt->host_fmt);
597                 unsigned int w_factor;
598
599                 width = out_width;
600
601                 switch (icd->current_fmt->host_fmt->packing) {
602                 case SOC_MBUS_PACKING_2X8_PADHI:
603                         w_factor = 2;
604                         break;
605                 default:
606                         w_factor = 1;
607                 }
608
609                 in_width = rect->width * w_factor;
610                 left_offset = left_offset * w_factor;
611
612                 if (bytes_per_line < 0)
613                         cdwdr_width = out_width;
614                 else
615                         cdwdr_width = bytes_per_line;
616         }
617
618         height = out_height;
619         in_height = rect->height;
620         if (V4L2_FIELD_NONE != pcdev->field) {
621                 height /= 2;
622                 in_height /= 2;
623                 top_offset /= 2;
624                 cdwdr_width *= 2;
625         }
626
627         /* Set CAMOR, CAPWR, CFSZR, take care of CDWDR */
628         camor = left_offset | (top_offset << 16);
629
630         dev_geo(icd->dev.parent,
631                 "CAMOR 0x%x, CAPWR 0x%x, CFSZR 0x%x, CDWDR 0x%x\n", camor,
632                 (in_height << 16) | in_width, (height << 16) | width,
633                 cdwdr_width);
634
635         ceu_write(pcdev, CAMOR, camor);
636         ceu_write(pcdev, CAPWR, (in_height << 16) | in_width);
637         ceu_write(pcdev, CFSZR, (height << 16) | width);
638         ceu_write(pcdev, CDWDR, cdwdr_width);
639 }
640
641 static u32 capture_save_reset(struct sh_mobile_ceu_dev *pcdev)
642 {
643         u32 capsr = ceu_read(pcdev, CAPSR);
644         ceu_write(pcdev, CAPSR, 1 << 16); /* reset, stop capture */
645         return capsr;
646 }
647
648 static void capture_restore(struct sh_mobile_ceu_dev *pcdev, u32 capsr)
649 {
650         unsigned long timeout = jiffies + 10 * HZ;
651
652         /*
653          * Wait until the end of the current frame. It can take a long time,
654          * but if it has been aborted by a CAPSR reset, it shoule exit sooner.
655          */
656         while ((ceu_read(pcdev, CSTSR) & 1) && time_before(jiffies, timeout))
657                 msleep(1);
658
659         if (time_after(jiffies, timeout)) {
660                 dev_err(pcdev->ici.v4l2_dev.dev,
661                         "Timeout waiting for frame end! Interface problem?\n");
662                 return;
663         }
664
665         /* Wait until reset clears, this shall not hang... */
666         while (ceu_read(pcdev, CAPSR) & (1 << 16))
667                 udelay(10);
668
669         /* Anything to restore? */
670         if (capsr & ~(1 << 16))
671                 ceu_write(pcdev, CAPSR, capsr);
672 }
673
674 static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
675                                        __u32 pixfmt)
676 {
677         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
678         struct sh_mobile_ceu_dev *pcdev = ici->priv;
679         int ret;
680         unsigned long camera_flags, common_flags, value;
681         int yuv_lineskip;
682         struct sh_mobile_ceu_cam *cam = icd->host_priv;
683         u32 capsr = capture_save_reset(pcdev);
684
685         camera_flags = icd->ops->query_bus_param(icd);
686         common_flags = soc_camera_bus_param_compatible(camera_flags,
687                                                        make_bus_param(pcdev));
688         if (!common_flags)
689                 return -EINVAL;
690
691         /* Make choises, based on platform preferences */
692         if ((common_flags & SOCAM_HSYNC_ACTIVE_HIGH) &&
693             (common_flags & SOCAM_HSYNC_ACTIVE_LOW)) {
694                 if (pcdev->pdata->flags & SH_CEU_FLAG_HSYNC_LOW)
695                         common_flags &= ~SOCAM_HSYNC_ACTIVE_HIGH;
696                 else
697                         common_flags &= ~SOCAM_HSYNC_ACTIVE_LOW;
698         }
699
700         if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) &&
701             (common_flags & SOCAM_VSYNC_ACTIVE_LOW)) {
702                 if (pcdev->pdata->flags & SH_CEU_FLAG_VSYNC_LOW)
703                         common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH;
704                 else
705                         common_flags &= ~SOCAM_VSYNC_ACTIVE_LOW;
706         }
707
708         ret = icd->ops->set_bus_param(icd, common_flags);
709         if (ret < 0)
710                 return ret;
711
712         switch (common_flags & SOCAM_DATAWIDTH_MASK) {
713         case SOCAM_DATAWIDTH_8:
714                 pcdev->is_16bit = 0;
715                 break;
716         case SOCAM_DATAWIDTH_16:
717                 pcdev->is_16bit = 1;
718                 break;
719         default:
720                 return -EINVAL;
721         }
722
723         ceu_write(pcdev, CRCNTR, 0);
724         ceu_write(pcdev, CRCMPR, 0);
725
726         value = 0x00000010; /* data fetch by default */
727         yuv_lineskip = 0;
728
729         switch (icd->current_fmt->host_fmt->fourcc) {
730         case V4L2_PIX_FMT_NV12:
731         case V4L2_PIX_FMT_NV21:
732                 yuv_lineskip = 1; /* skip for NV12/21, no skip for NV16/61 */
733                 /* fall-through */
734         case V4L2_PIX_FMT_NV16:
735         case V4L2_PIX_FMT_NV61:
736                 switch (cam->code) {
737                 case V4L2_MBUS_FMT_YUYV8_2X8_BE:
738                         value = 0x00000000; /* Cb0, Y0, Cr0, Y1 */
739                         break;
740                 case V4L2_MBUS_FMT_YVYU8_2X8_BE:
741                         value = 0x00000100; /* Cr0, Y0, Cb0, Y1 */
742                         break;
743                 case V4L2_MBUS_FMT_YUYV8_2X8_LE:
744                         value = 0x00000200; /* Y0, Cb0, Y1, Cr0 */
745                         break;
746                 case V4L2_MBUS_FMT_YVYU8_2X8_LE:
747                         value = 0x00000300; /* Y0, Cr0, Y1, Cb0 */
748                         break;
749                 default:
750                         BUG();
751                 }
752         }
753
754         if (icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV21 ||
755             icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV61)
756                 value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */
757
758         value |= common_flags & SOCAM_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
759         value |= common_flags & SOCAM_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
760         value |= pcdev->is_16bit ? 1 << 12 : 0;
761         ceu_write(pcdev, CAMCR, value);
762
763         ceu_write(pcdev, CAPCR, 0x00300000);
764
765         switch (pcdev->field) {
766         case V4L2_FIELD_INTERLACED_TB:
767                 value = 0x101;
768                 break;
769         case V4L2_FIELD_INTERLACED_BT:
770                 value = 0x102;
771                 break;
772         default:
773                 value = 0;
774                 break;
775         }
776         ceu_write(pcdev, CAIFR, value);
777
778         sh_mobile_ceu_set_rect(icd, icd->user_width, icd->user_height);
779         mdelay(1);
780
781         ceu_write(pcdev, CFLCR, pcdev->cflcr);
782
783         /*
784          * A few words about byte order (observed in Big Endian mode)
785          *
786          * In data fetch mode bytes are received in chunks of 8 bytes.
787          * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
788          *
789          * The data is however by default written to memory in reverse order:
790          * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
791          *
792          * The lowest three bits of CDOCR allows us to do swapping,
793          * using 7 we swap the data bytes to match the incoming order:
794          * D0, D1, D2, D3, D4, D5, D6, D7
795          */
796         value = 0x00000017;
797         if (yuv_lineskip)
798                 value &= ~0x00000010; /* convert 4:2:2 -> 4:2:0 */
799
800         ceu_write(pcdev, CDOCR, value);
801         ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
802
803         dev_dbg(icd->dev.parent, "S_FMT successful for %c%c%c%c %ux%u\n",
804                 pixfmt & 0xff, (pixfmt >> 8) & 0xff,
805                 (pixfmt >> 16) & 0xff, (pixfmt >> 24) & 0xff,
806                 icd->user_width, icd->user_height);
807
808         capture_restore(pcdev, capsr);
809
810         /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
811         return 0;
812 }
813
814 static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd,
815                                        unsigned char buswidth)
816 {
817         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
818         struct sh_mobile_ceu_dev *pcdev = ici->priv;
819         unsigned long camera_flags, common_flags;
820
821         camera_flags = icd->ops->query_bus_param(icd);
822         common_flags = soc_camera_bus_param_compatible(camera_flags,
823                                                        make_bus_param(pcdev));
824         if (!common_flags || buswidth > 16 ||
825             (buswidth > 8 && !(common_flags & SOCAM_DATAWIDTH_16)))
826                 return -EINVAL;
827
828         return 0;
829 }
830
831 static const struct soc_mbus_pixelfmt sh_mobile_ceu_formats[] = {
832         {
833                 .fourcc                 = V4L2_PIX_FMT_NV12,
834                 .name                   = "NV12",
835                 .bits_per_sample        = 12,
836                 .packing                = SOC_MBUS_PACKING_NONE,
837                 .order                  = SOC_MBUS_ORDER_LE,
838         }, {
839                 .fourcc                 = V4L2_PIX_FMT_NV21,
840                 .name                   = "NV21",
841                 .bits_per_sample        = 12,
842                 .packing                = SOC_MBUS_PACKING_NONE,
843                 .order                  = SOC_MBUS_ORDER_LE,
844         }, {
845                 .fourcc                 = V4L2_PIX_FMT_NV16,
846                 .name                   = "NV16",
847                 .bits_per_sample        = 16,
848                 .packing                = SOC_MBUS_PACKING_NONE,
849                 .order                  = SOC_MBUS_ORDER_LE,
850         }, {
851                 .fourcc                 = V4L2_PIX_FMT_NV61,
852                 .name                   = "NV61",
853                 .bits_per_sample        = 16,
854                 .packing                = SOC_MBUS_PACKING_NONE,
855                 .order                  = SOC_MBUS_ORDER_LE,
856         },
857 };
858
859 /* This will be corrected as we get more formats */
860 static bool sh_mobile_ceu_packing_supported(const struct soc_mbus_pixelfmt *fmt)
861 {
862         return  fmt->packing == SOC_MBUS_PACKING_NONE ||
863                 (fmt->bits_per_sample == 8 &&
864                  fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
865                 (fmt->bits_per_sample > 8 &&
866                  fmt->packing == SOC_MBUS_PACKING_EXTEND16);
867 }
868
869 static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, int idx,
870                                      struct soc_camera_format_xlate *xlate)
871 {
872         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
873         struct device *dev = icd->dev.parent;
874         int ret, k, n;
875         int formats = 0;
876         struct sh_mobile_ceu_cam *cam;
877         enum v4l2_mbus_pixelcode code;
878         const struct soc_mbus_pixelfmt *fmt;
879
880         ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
881         if (ret < 0)
882                 /* No more formats */
883                 return 0;
884
885         fmt = soc_mbus_get_fmtdesc(code);
886         if (!fmt) {
887                 dev_err(icd->dev.parent,
888                         "Invalid format code #%d: %d\n", idx, code);
889                 return -EINVAL;
890         }
891
892         ret = sh_mobile_ceu_try_bus_param(icd, fmt->bits_per_sample);
893         if (ret < 0)
894                 return 0;
895
896         if (!icd->host_priv) {
897                 cam = kzalloc(sizeof(*cam), GFP_KERNEL);
898                 if (!cam)
899                         return -ENOMEM;
900
901                 icd->host_priv = cam;
902         } else {
903                 cam = icd->host_priv;
904         }
905
906         /* Beginning of a pass */
907         if (!idx)
908                 cam->extra_fmt = NULL;
909
910         switch (code) {
911         case V4L2_MBUS_FMT_YUYV8_2X8_BE:
912         case V4L2_MBUS_FMT_YVYU8_2X8_BE:
913         case V4L2_MBUS_FMT_YUYV8_2X8_LE:
914         case V4L2_MBUS_FMT_YVYU8_2X8_LE:
915                 if (cam->extra_fmt)
916                         break;
917
918                 /*
919                  * Our case is simple so far: for any of the above four camera
920                  * formats we add all our four synthesized NV* formats, so,
921                  * just marking the device with a single flag suffices. If
922                  * the format generation rules are more complex, you would have
923                  * to actually hang your already added / counted formats onto
924                  * the host_priv pointer and check whether the format you're
925                  * going to add now is already there.
926                  */
927                 cam->extra_fmt = sh_mobile_ceu_formats;
928
929                 n = ARRAY_SIZE(sh_mobile_ceu_formats);
930                 formats += n;
931                 for (k = 0; xlate && k < n; k++) {
932                         xlate->host_fmt = &sh_mobile_ceu_formats[k];
933                         xlate->code     = code;
934                         xlate++;
935                         dev_dbg(dev, "Providing format %s using code %d\n",
936                                 sh_mobile_ceu_formats[k].name, code);
937                 }
938                 break;
939         default:
940                 if (!sh_mobile_ceu_packing_supported(fmt))
941                         return 0;
942         }
943
944         /* Generic pass-through */
945         formats++;
946         if (xlate) {
947                 xlate->host_fmt = fmt;
948                 xlate->code     = code;
949                 xlate++;
950                 dev_dbg(dev, "Providing format %s in pass-through mode\n",
951                         xlate->host_fmt->name);
952         }
953
954         return formats;
955 }
956
957 static void sh_mobile_ceu_put_formats(struct soc_camera_device *icd)
958 {
959         kfree(icd->host_priv);
960         icd->host_priv = NULL;
961 }
962
963 /* Check if any dimension of r1 is smaller than respective one of r2 */
964 static bool is_smaller(struct v4l2_rect *r1, struct v4l2_rect *r2)
965 {
966         return r1->width < r2->width || r1->height < r2->height;
967 }
968
969 /* Check if r1 fails to cover r2 */
970 static bool is_inside(struct v4l2_rect *r1, struct v4l2_rect *r2)
971 {
972         return r1->left > r2->left || r1->top > r2->top ||
973                 r1->left + r1->width < r2->left + r2->width ||
974                 r1->top + r1->height < r2->top + r2->height;
975 }
976
977 static unsigned int scale_down(unsigned int size, unsigned int scale)
978 {
979         return (size * 4096 + scale / 2) / scale;
980 }
981
982 static unsigned int scale_up(unsigned int size, unsigned int scale)
983 {
984         return (size * scale + 2048) / 4096;
985 }
986
987 static unsigned int calc_generic_scale(unsigned int input, unsigned int output)
988 {
989         return (input * 4096 + output / 2) / output;
990 }
991
992 static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect)
993 {
994         struct v4l2_crop crop;
995         struct v4l2_cropcap cap;
996         int ret;
997
998         crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
999
1000         ret = v4l2_subdev_call(sd, video, g_crop, &crop);
1001         if (!ret) {
1002                 *rect = crop.c;
1003                 return ret;
1004         }
1005
1006         /* Camera driver doesn't support .g_crop(), assume default rectangle */
1007         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1008
1009         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1010         if (ret < 0)
1011                 return ret;
1012
1013         *rect = cap.defrect;
1014
1015         return ret;
1016 }
1017
1018 /*
1019  * The common for both scaling and cropping iterative approach is:
1020  * 1. try if the client can produce exactly what requested by the user
1021  * 2. if (1) failed, try to double the client image until we get one big enough
1022  * 3. if (2) failed, try to request the maximum image
1023  */
1024 static int client_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *crop,
1025                          struct v4l2_crop *cam_crop)
1026 {
1027         struct v4l2_rect *rect = &crop->c, *cam_rect = &cam_crop->c;
1028         struct device *dev = sd->v4l2_dev->dev;
1029         struct v4l2_cropcap cap;
1030         int ret;
1031         unsigned int width, height;
1032
1033         v4l2_subdev_call(sd, video, s_crop, crop);
1034         ret = client_g_rect(sd, cam_rect);
1035         if (ret < 0)
1036                 return ret;
1037
1038         /*
1039          * Now cam_crop contains the current camera input rectangle, and it must
1040          * be within camera cropcap bounds
1041          */
1042         if (!memcmp(rect, cam_rect, sizeof(*rect))) {
1043                 /* Even if camera S_CROP failed, but camera rectangle matches */
1044                 dev_dbg(dev, "Camera S_CROP successful for %ux%u@%u:%u\n",
1045                         rect->width, rect->height, rect->left, rect->top);
1046                 return 0;
1047         }
1048
1049         /* Try to fix cropping, that camera hasn't managed to set */
1050         dev_geo(dev, "Fix camera S_CROP for %ux%u@%u:%u to %ux%u@%u:%u\n",
1051                 cam_rect->width, cam_rect->height,
1052                 cam_rect->left, cam_rect->top,
1053                 rect->width, rect->height, rect->left, rect->top);
1054
1055         /* We need sensor maximum rectangle */
1056         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1057         if (ret < 0)
1058                 return ret;
1059
1060         soc_camera_limit_side(&rect->left, &rect->width, cap.bounds.left, 2,
1061                               cap.bounds.width);
1062         soc_camera_limit_side(&rect->top, &rect->height, cap.bounds.top, 4,
1063                               cap.bounds.height);
1064
1065         /*
1066          * Popular special case - some cameras can only handle fixed sizes like
1067          * QVGA, VGA,... Take care to avoid infinite loop.
1068          */
1069         width = max(cam_rect->width, 2);
1070         height = max(cam_rect->height, 2);
1071
1072         while (!ret && (is_smaller(cam_rect, rect) ||
1073                         is_inside(cam_rect, rect)) &&
1074                (cap.bounds.width > width || cap.bounds.height > height)) {
1075
1076                 width *= 2;
1077                 height *= 2;
1078
1079                 cam_rect->width = width;
1080                 cam_rect->height = height;
1081
1082                 /*
1083                  * We do not know what capabilities the camera has to set up
1084                  * left and top borders. We could try to be smarter in iterating
1085                  * them, e.g., if camera current left is to the right of the
1086                  * target left, set it to the middle point between the current
1087                  * left and minimum left. But that would add too much
1088                  * complexity: we would have to iterate each border separately.
1089                  */
1090                 if (cam_rect->left > rect->left)
1091                         cam_rect->left = cap.bounds.left;
1092
1093                 if (cam_rect->left + cam_rect->width < rect->left + rect->width)
1094                         cam_rect->width = rect->left + rect->width -
1095                                 cam_rect->left;
1096
1097                 if (cam_rect->top > rect->top)
1098                         cam_rect->top = cap.bounds.top;
1099
1100                 if (cam_rect->top + cam_rect->height < rect->top + rect->height)
1101                         cam_rect->height = rect->top + rect->height -
1102                                 cam_rect->top;
1103
1104                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1105                 ret = client_g_rect(sd, cam_rect);
1106                 dev_geo(dev, "Camera S_CROP %d for %ux%u@%u:%u\n", ret,
1107                         cam_rect->width, cam_rect->height,
1108                         cam_rect->left, cam_rect->top);
1109         }
1110
1111         /* S_CROP must not modify the rectangle */
1112         if (is_smaller(cam_rect, rect) || is_inside(cam_rect, rect)) {
1113                 /*
1114                  * The camera failed to configure a suitable cropping,
1115                  * we cannot use the current rectangle, set to max
1116                  */
1117                 *cam_rect = cap.bounds;
1118                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1119                 ret = client_g_rect(sd, cam_rect);
1120                 dev_geo(dev, "Camera S_CROP %d for max %ux%u@%u:%u\n", ret,
1121                         cam_rect->width, cam_rect->height,
1122                         cam_rect->left, cam_rect->top);
1123         }
1124
1125         return ret;
1126 }
1127
1128 static int get_camera_scales(struct v4l2_subdev *sd, struct v4l2_rect *rect,
1129                              unsigned int *scale_h, unsigned int *scale_v)
1130 {
1131         struct v4l2_mbus_framefmt mf;
1132         int ret;
1133
1134         ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
1135         if (ret < 0)
1136                 return ret;
1137
1138         *scale_h = calc_generic_scale(rect->width, mf.width);
1139         *scale_v = calc_generic_scale(rect->height, mf.height);
1140
1141         return 0;
1142 }
1143
1144 static int get_camera_subwin(struct soc_camera_device *icd,
1145                              struct v4l2_rect *cam_subrect,
1146                              unsigned int cam_hscale, unsigned int cam_vscale)
1147 {
1148         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1149         struct v4l2_rect *ceu_rect = &cam->ceu_rect;
1150
1151         if (!ceu_rect->width) {
1152                 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1153                 struct device *dev = icd->dev.parent;
1154                 struct v4l2_mbus_framefmt mf;
1155                 int ret;
1156                 /* First time */
1157
1158                 ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
1159                 if (ret < 0)
1160                         return ret;
1161
1162                 dev_geo(dev, "camera fmt %ux%u\n", mf.width, mf.height);
1163
1164                 if (mf.width > 2560) {
1165                         ceu_rect->width  = 2560;
1166                         ceu_rect->left   = (mf.width - 2560) / 2;
1167                 } else {
1168                         ceu_rect->width  = mf.width;
1169                         ceu_rect->left   = 0;
1170                 }
1171
1172                 if (mf.height > 1920) {
1173                         ceu_rect->height = 1920;
1174                         ceu_rect->top    = (mf.height - 1920) / 2;
1175                 } else {
1176                         ceu_rect->height = mf.height;
1177                         ceu_rect->top    = 0;
1178                 }
1179
1180                 dev_geo(dev, "initialised CEU rect %ux%u@%u:%u\n",
1181                         ceu_rect->width, ceu_rect->height,
1182                         ceu_rect->left, ceu_rect->top);
1183         }
1184
1185         cam_subrect->width      = scale_up(ceu_rect->width, cam_hscale);
1186         cam_subrect->left       = scale_up(ceu_rect->left, cam_hscale);
1187         cam_subrect->height     = scale_up(ceu_rect->height, cam_vscale);
1188         cam_subrect->top        = scale_up(ceu_rect->top, cam_vscale);
1189
1190         return 0;
1191 }
1192
1193 static int client_s_fmt(struct soc_camera_device *icd,
1194                         struct v4l2_mbus_framefmt *mf, bool ceu_can_scale)
1195 {
1196         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1197         struct device *dev = icd->dev.parent;
1198         unsigned int width = mf->width, height = mf->height, tmp_w, tmp_h;
1199         unsigned int max_width, max_height;
1200         struct v4l2_cropcap cap;
1201         int ret;
1202
1203         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1204
1205         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1206         if (ret < 0)
1207                 return ret;
1208
1209         max_width = min(cap.bounds.width, 2560);
1210         max_height = min(cap.bounds.height, 1920);
1211
1212         ret = v4l2_subdev_call(sd, video, s_mbus_fmt, mf);
1213         if (ret < 0)
1214                 return ret;
1215
1216         dev_geo(dev, "camera scaled to %ux%u\n", mf->width, mf->height);
1217
1218         if ((width == mf->width && height == mf->height) || !ceu_can_scale)
1219                 return 0;
1220
1221         /* Camera set a format, but geometry is not precise, try to improve */
1222         tmp_w = mf->width;
1223         tmp_h = mf->height;
1224
1225         /* width <= max_width && height <= max_height - guaranteed by try_fmt */
1226         while ((width > tmp_w || height > tmp_h) &&
1227                tmp_w < max_width && tmp_h < max_height) {
1228                 tmp_w = min(2 * tmp_w, max_width);
1229                 tmp_h = min(2 * tmp_h, max_height);
1230                 mf->width = tmp_w;
1231                 mf->height = tmp_h;
1232                 ret = v4l2_subdev_call(sd, video, s_mbus_fmt, mf);
1233                 dev_geo(dev, "Camera scaled to %ux%u\n",
1234                         mf->width, mf->height);
1235                 if (ret < 0) {
1236                         /* This shouldn't happen */
1237                         dev_err(dev, "Client failed to set format: %d\n", ret);
1238                         return ret;
1239                 }
1240         }
1241
1242         return 0;
1243 }
1244
1245 /**
1246  * @rect        - camera cropped rectangle
1247  * @sub_rect    - CEU cropped rectangle, mapped back to camera input area
1248  * @ceu_rect    - on output calculated CEU crop rectangle
1249  */
1250 static int client_scale(struct soc_camera_device *icd, struct v4l2_rect *rect,
1251                         struct v4l2_rect *sub_rect, struct v4l2_rect *ceu_rect,
1252                         struct v4l2_mbus_framefmt *mf, bool ceu_can_scale)
1253 {
1254         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1255         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1256         struct device *dev = icd->dev.parent;
1257         struct v4l2_mbus_framefmt mf_tmp = *mf;
1258         unsigned int scale_h, scale_v;
1259         int ret;
1260
1261         /* 5. Apply iterative camera S_FMT for camera user window. */
1262         ret = client_s_fmt(icd, &mf_tmp, ceu_can_scale);
1263         if (ret < 0)
1264                 return ret;
1265
1266         dev_geo(dev, "5: camera scaled to %ux%u\n",
1267                 mf_tmp.width, mf_tmp.height);
1268
1269         /* 6. Retrieve camera output window (g_fmt) */
1270
1271         /* unneeded - it is already in "mf_tmp" */
1272
1273         /* 7. Calculate new camera scales. */
1274         ret = get_camera_scales(sd, rect, &scale_h, &scale_v);
1275         if (ret < 0)
1276                 return ret;
1277
1278         dev_geo(dev, "7: camera scales %u:%u\n", scale_h, scale_v);
1279
1280         cam->cam_width  = mf_tmp.width;
1281         cam->cam_height = mf_tmp.height;
1282         mf->width       = mf_tmp.width;
1283         mf->height      = mf_tmp.height;
1284         mf->colorspace  = mf_tmp.colorspace;
1285
1286         /*
1287          * 8. Calculate new CEU crop - apply camera scales to previously
1288          *    calculated "effective" crop.
1289          */
1290         ceu_rect->left = scale_down(sub_rect->left, scale_h);
1291         ceu_rect->width = scale_down(sub_rect->width, scale_h);
1292         ceu_rect->top = scale_down(sub_rect->top, scale_v);
1293         ceu_rect->height = scale_down(sub_rect->height, scale_v);
1294
1295         dev_geo(dev, "8: new CEU rect %ux%u@%u:%u\n",
1296                 ceu_rect->width, ceu_rect->height,
1297                 ceu_rect->left, ceu_rect->top);
1298
1299         return 0;
1300 }
1301
1302 /* Get combined scales */
1303 static int get_scales(struct soc_camera_device *icd,
1304                       unsigned int *scale_h, unsigned int *scale_v)
1305 {
1306         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1307         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1308         struct v4l2_crop cam_crop;
1309         unsigned int width_in, height_in;
1310         int ret;
1311
1312         cam_crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1313
1314         ret = client_g_rect(sd, &cam_crop.c);
1315         if (ret < 0)
1316                 return ret;
1317
1318         ret = get_camera_scales(sd, &cam_crop.c, scale_h, scale_v);
1319         if (ret < 0)
1320                 return ret;
1321
1322         width_in = scale_up(cam->ceu_rect.width, *scale_h);
1323         height_in = scale_up(cam->ceu_rect.height, *scale_v);
1324
1325         *scale_h = calc_generic_scale(width_in, icd->user_width);
1326         *scale_v = calc_generic_scale(height_in, icd->user_height);
1327
1328         return 0;
1329 }
1330
1331 /*
1332  * CEU can scale and crop, but we don't want to waste bandwidth and kill the
1333  * framerate by always requesting the maximum image from the client. See
1334  * Documentation/video4linux/sh_mobile_camera_ceu.txt for a description of
1335  * scaling and cropping algorithms and for the meaning of referenced here steps.
1336  */
1337 static int sh_mobile_ceu_set_crop(struct soc_camera_device *icd,
1338                                   struct v4l2_crop *a)
1339 {
1340         struct v4l2_rect *rect = &a->c;
1341         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1342         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1343         struct v4l2_crop cam_crop;
1344         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1345         struct v4l2_rect *cam_rect = &cam_crop.c, *ceu_rect = &cam->ceu_rect;
1346         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1347         struct device *dev = icd->dev.parent;
1348         struct v4l2_mbus_framefmt mf;
1349         unsigned int scale_comb_h, scale_comb_v, scale_ceu_h, scale_ceu_v,
1350                 out_width, out_height;
1351         u32 capsr, cflcr;
1352         int ret;
1353
1354         /* 1. Calculate current combined scales. */
1355         ret = get_scales(icd, &scale_comb_h, &scale_comb_v);
1356         if (ret < 0)
1357                 return ret;
1358
1359         dev_geo(dev, "1: combined scales %u:%u\n", scale_comb_h, scale_comb_v);
1360
1361         /* 2. Apply iterative camera S_CROP for new input window. */
1362         ret = client_s_crop(sd, a, &cam_crop);
1363         if (ret < 0)
1364                 return ret;
1365
1366         dev_geo(dev, "2: camera cropped to %ux%u@%u:%u\n",
1367                 cam_rect->width, cam_rect->height,
1368                 cam_rect->left, cam_rect->top);
1369
1370         /* On success cam_crop contains current camera crop */
1371
1372         /*
1373          * 3. If old combined scales applied to new crop produce an impossible
1374          *    user window, adjust scales to produce nearest possible window.
1375          */
1376         out_width       = scale_down(rect->width, scale_comb_h);
1377         out_height      = scale_down(rect->height, scale_comb_v);
1378
1379         if (out_width > 2560)
1380                 out_width = 2560;
1381         else if (out_width < 2)
1382                 out_width = 2;
1383
1384         if (out_height > 1920)
1385                 out_height = 1920;
1386         else if (out_height < 4)
1387                 out_height = 4;
1388
1389         dev_geo(dev, "3: Adjusted output %ux%u\n", out_width, out_height);
1390
1391         /* 4. Use G_CROP to retrieve actual input window: already in cam_crop */
1392
1393         /*
1394          * 5. Using actual input window and calculated combined scales calculate
1395          *    camera target output window.
1396          */
1397         mf.width        = scale_down(cam_rect->width, scale_comb_h);
1398         mf.height       = scale_down(cam_rect->height, scale_comb_v);
1399
1400         dev_geo(dev, "5: camera target %ux%u\n", mf.width, mf.height);
1401
1402         /* 6. - 9. */
1403         mf.code         = cam->code;
1404         mf.field        = pcdev->field;
1405
1406         capsr = capture_save_reset(pcdev);
1407         dev_dbg(dev, "CAPSR 0x%x, CFLCR 0x%x\n", capsr, pcdev->cflcr);
1408
1409         /* Make relative to camera rectangle */
1410         rect->left      -= cam_rect->left;
1411         rect->top       -= cam_rect->top;
1412
1413         ret = client_scale(icd, cam_rect, rect, ceu_rect, &mf,
1414                            pcdev->image_mode &&
1415                            V4L2_FIELD_NONE == pcdev->field);
1416
1417         dev_geo(dev, "6-9: %d\n", ret);
1418
1419         /* 10. Use CEU cropping to crop to the new window. */
1420         sh_mobile_ceu_set_rect(icd, out_width, out_height);
1421
1422         dev_geo(dev, "10: CEU cropped to %ux%u@%u:%u\n",
1423                 ceu_rect->width, ceu_rect->height,
1424                 ceu_rect->left, ceu_rect->top);
1425
1426         /*
1427          * 11. Calculate CEU scales from camera scales from results of (10) and
1428          *     user window from (3)
1429          */
1430         scale_ceu_h = calc_scale(ceu_rect->width, &out_width);
1431         scale_ceu_v = calc_scale(ceu_rect->height, &out_height);
1432
1433         dev_geo(dev, "11: CEU scales %u:%u\n", scale_ceu_h, scale_ceu_v);
1434
1435         /* 12. Apply CEU scales. */
1436         cflcr = scale_ceu_h | (scale_ceu_v << 16);
1437         if (cflcr != pcdev->cflcr) {
1438                 pcdev->cflcr = cflcr;
1439                 ceu_write(pcdev, CFLCR, cflcr);
1440         }
1441
1442         /* Restore capture */
1443         if (pcdev->active)
1444                 capsr |= 1;
1445         capture_restore(pcdev, capsr);
1446
1447         icd->user_width = out_width;
1448         icd->user_height = out_height;
1449
1450         /* Even if only camera cropping succeeded */
1451         return ret;
1452 }
1453
1454 /* Similar to set_crop multistage iterative algorithm */
1455 static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
1456                                  struct v4l2_format *f)
1457 {
1458         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1459         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1460         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1461         struct v4l2_pix_format *pix = &f->fmt.pix;
1462         struct v4l2_mbus_framefmt mf;
1463         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1464         struct device *dev = icd->dev.parent;
1465         __u32 pixfmt = pix->pixelformat;
1466         const struct soc_camera_format_xlate *xlate;
1467         struct v4l2_crop cam_crop;
1468         struct v4l2_rect *cam_rect = &cam_crop.c, cam_subrect, ceu_rect;
1469         unsigned int scale_cam_h, scale_cam_v;
1470         u16 scale_v, scale_h;
1471         int ret;
1472         bool image_mode;
1473         enum v4l2_field field;
1474
1475         switch (pix->field) {
1476         default:
1477                 pix->field = V4L2_FIELD_NONE;
1478                 /* fall-through */
1479         case V4L2_FIELD_INTERLACED_TB:
1480         case V4L2_FIELD_INTERLACED_BT:
1481         case V4L2_FIELD_NONE:
1482                 field = pix->field;
1483                 break;
1484         case V4L2_FIELD_INTERLACED:
1485                 field = V4L2_FIELD_INTERLACED_TB;
1486                 break;
1487         }
1488
1489         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1490         if (!xlate) {
1491                 dev_warn(dev, "Format %x not found\n", pixfmt);
1492                 return -EINVAL;
1493         }
1494
1495         /* 1. Calculate current camera scales. */
1496         cam_crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1497
1498         ret = client_g_rect(sd, cam_rect);
1499         if (ret < 0)
1500                 return ret;
1501
1502         ret = get_camera_scales(sd, cam_rect, &scale_cam_h, &scale_cam_v);
1503         if (ret < 0)
1504                 return ret;
1505
1506         dev_geo(dev, "1: camera scales %u:%u\n", scale_cam_h, scale_cam_v);
1507
1508         /*
1509          * 2. Calculate "effective" input crop (sensor subwindow) - CEU crop
1510          *    scaled back at current camera scales onto input window.
1511          */
1512         ret = get_camera_subwin(icd, &cam_subrect, scale_cam_h, scale_cam_v);
1513         if (ret < 0)
1514                 return ret;
1515
1516         dev_geo(dev, "2: subwin %ux%u@%u:%u\n",
1517                 cam_subrect.width, cam_subrect.height,
1518                 cam_subrect.left, cam_subrect.top);
1519
1520         /*
1521          * 3. Calculate new combined scales from "effective" input window to
1522          *    requested user window.
1523          */
1524         scale_h = calc_generic_scale(cam_subrect.width, pix->width);
1525         scale_v = calc_generic_scale(cam_subrect.height, pix->height);
1526
1527         dev_geo(dev, "3: scales %u:%u\n", scale_h, scale_v);
1528
1529         /*
1530          * 4. Calculate camera output window by applying combined scales to real
1531          *    input window.
1532          */
1533         mf.width        = scale_down(cam_rect->width, scale_h);
1534         mf.height       = scale_down(cam_rect->height, scale_v);
1535         mf.field        = pix->field;
1536         mf.colorspace   = pix->colorspace;
1537         mf.code         = xlate->code;
1538
1539         switch (pixfmt) {
1540         case V4L2_PIX_FMT_NV12:
1541         case V4L2_PIX_FMT_NV21:
1542         case V4L2_PIX_FMT_NV16:
1543         case V4L2_PIX_FMT_NV61:
1544                 image_mode = true;
1545                 break;
1546         default:
1547                 image_mode = false;
1548         }
1549
1550         dev_geo(dev, "4: camera output %ux%u\n", mf.width, mf.height);
1551
1552         /* 5. - 9. */
1553         ret = client_scale(icd, cam_rect, &cam_subrect, &ceu_rect, &mf,
1554                            image_mode && V4L2_FIELD_NONE == field);
1555
1556         dev_geo(dev, "5-9: client scale %d\n", ret);
1557
1558         /* Done with the camera. Now see if we can improve the result */
1559
1560         dev_dbg(dev, "Camera %d fmt %ux%u, requested %ux%u\n",
1561                 ret, mf.width, mf.height, pix->width, pix->height);
1562         if (ret < 0)
1563                 return ret;
1564
1565         if (mf.code != xlate->code)
1566                 return -EINVAL;
1567
1568         /* 10. Use CEU scaling to scale to the requested user window. */
1569
1570         /* We cannot scale up */
1571         if (pix->width > mf.width)
1572                 pix->width = mf.width;
1573         if (pix->width > ceu_rect.width)
1574                 pix->width = ceu_rect.width;
1575
1576         if (pix->height > mf.height)
1577                 pix->height = mf.height;
1578         if (pix->height > ceu_rect.height)
1579                 pix->height = ceu_rect.height;
1580
1581         pix->colorspace = mf.colorspace;
1582
1583         if (image_mode) {
1584                 /* Scale pix->{width x height} down to width x height */
1585                 scale_h = calc_scale(ceu_rect.width, &pix->width);
1586                 scale_v = calc_scale(ceu_rect.height, &pix->height);
1587
1588                 pcdev->cflcr = scale_h | (scale_v << 16);
1589         } else {
1590                 pix->width = ceu_rect.width;
1591                 pix->height = ceu_rect.height;
1592                 scale_h = scale_v = 0;
1593                 pcdev->cflcr = 0;
1594         }
1595
1596         dev_geo(dev, "10: W: %u : 0x%x = %u, H: %u : 0x%x = %u\n",
1597                 ceu_rect.width, scale_h, pix->width,
1598                 ceu_rect.height, scale_v, pix->height);
1599
1600         cam->code               = xlate->code;
1601         cam->ceu_rect           = ceu_rect;
1602         icd->current_fmt        = xlate;
1603
1604         pcdev->field = field;
1605         pcdev->image_mode = image_mode;
1606
1607         return 0;
1608 }
1609
1610 static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
1611                                  struct v4l2_format *f)
1612 {
1613         const struct soc_camera_format_xlate *xlate;
1614         struct v4l2_pix_format *pix = &f->fmt.pix;
1615         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1616         struct v4l2_mbus_framefmt mf;
1617         __u32 pixfmt = pix->pixelformat;
1618         int width, height;
1619         int ret;
1620
1621         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1622         if (!xlate) {
1623                 dev_warn(icd->dev.parent, "Format %x not found\n", pixfmt);
1624                 return -EINVAL;
1625         }
1626
1627         /* FIXME: calculate using depth and bus width */
1628
1629         v4l_bound_align_image(&pix->width, 2, 2560, 1,
1630                               &pix->height, 4, 1920, 2, 0);
1631
1632         width = pix->width;
1633         height = pix->height;
1634
1635         pix->bytesperline = soc_mbus_bytes_per_line(width, xlate->host_fmt);
1636         if (pix->bytesperline < 0)
1637                 return pix->bytesperline;
1638         pix->sizeimage = height * pix->bytesperline;
1639
1640         /* limit to sensor capabilities */
1641         mf.width        = pix->width;
1642         mf.height       = pix->height;
1643         mf.field        = pix->field;
1644         mf.code         = xlate->code;
1645         mf.colorspace   = pix->colorspace;
1646
1647         ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
1648         if (ret < 0)
1649                 return ret;
1650
1651         pix->width      = mf.width;
1652         pix->height     = mf.height;
1653         pix->field      = mf.field;
1654         pix->colorspace = mf.colorspace;
1655
1656         switch (pixfmt) {
1657         case V4L2_PIX_FMT_NV12:
1658         case V4L2_PIX_FMT_NV21:
1659         case V4L2_PIX_FMT_NV16:
1660         case V4L2_PIX_FMT_NV61:
1661                 /* FIXME: check against rect_max after converting soc-camera */
1662                 /* We can scale precisely, need a bigger image from camera */
1663                 if (pix->width < width || pix->height < height) {
1664                         /*
1665                          * We presume, the sensor behaves sanely, i.e., if
1666                          * requested a bigger rectangle, it will not return a
1667                          * smaller one.
1668                          */
1669                         mf.width = 2560;
1670                         mf.height = 1920;
1671                         ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
1672                         if (ret < 0) {
1673                                 /* Shouldn't actually happen... */
1674                                 dev_err(icd->dev.parent,
1675                                         "FIXME: client try_fmt() = %d\n", ret);
1676                                 return ret;
1677                         }
1678                 }
1679                 /* We will scale exactly */
1680                 if (mf.width > width)
1681                         pix->width = width;
1682                 if (mf.height > height)
1683                         pix->height = height;
1684         }
1685
1686         return ret;
1687 }
1688
1689 static int sh_mobile_ceu_reqbufs(struct soc_camera_file *icf,
1690                                  struct v4l2_requestbuffers *p)
1691 {
1692         int i;
1693
1694         /*
1695          * This is for locking debugging only. I removed spinlocks and now I
1696          * check whether .prepare is ever called on a linked buffer, or whether
1697          * a dma IRQ can occur for an in-work or unlinked buffer. Until now
1698          * it hadn't triggered
1699          */
1700         for (i = 0; i < p->count; i++) {
1701                 struct sh_mobile_ceu_buffer *buf;
1702
1703                 buf = container_of(icf->vb_vidq.bufs[i],
1704                                    struct sh_mobile_ceu_buffer, vb);
1705                 INIT_LIST_HEAD(&buf->vb.queue);
1706         }
1707
1708         return 0;
1709 }
1710
1711 static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
1712 {
1713         struct soc_camera_file *icf = file->private_data;
1714         struct sh_mobile_ceu_buffer *buf;
1715
1716         buf = list_entry(icf->vb_vidq.stream.next,
1717                          struct sh_mobile_ceu_buffer, vb.stream);
1718
1719         poll_wait(file, &buf->vb.done, pt);
1720
1721         if (buf->vb.state == VIDEOBUF_DONE ||
1722             buf->vb.state == VIDEOBUF_ERROR)
1723                 return POLLIN|POLLRDNORM;
1724
1725         return 0;
1726 }
1727
1728 static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
1729                                   struct v4l2_capability *cap)
1730 {
1731         strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
1732         cap->version = KERNEL_VERSION(0, 0, 5);
1733         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1734         return 0;
1735 }
1736
1737 static void sh_mobile_ceu_init_videobuf(struct videobuf_queue *q,
1738                                         struct soc_camera_device *icd)
1739 {
1740         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1741         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1742
1743         videobuf_queue_dma_contig_init(q,
1744                                        &sh_mobile_ceu_videobuf_ops,
1745                                        icd->dev.parent, &pcdev->lock,
1746                                        V4L2_BUF_TYPE_VIDEO_CAPTURE,
1747                                        pcdev->field,
1748                                        sizeof(struct sh_mobile_ceu_buffer),
1749                                        icd);
1750 }
1751
1752 static int sh_mobile_ceu_get_parm(struct soc_camera_device *icd,
1753                                   struct v4l2_streamparm *parm)
1754 {
1755         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1756
1757         return v4l2_subdev_call(sd, video, g_parm, parm);
1758 }
1759
1760 static int sh_mobile_ceu_set_parm(struct soc_camera_device *icd,
1761                                   struct v4l2_streamparm *parm)
1762 {
1763         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1764
1765         return v4l2_subdev_call(sd, video, s_parm, parm);
1766 }
1767
1768 static int sh_mobile_ceu_get_ctrl(struct soc_camera_device *icd,
1769                                   struct v4l2_control *ctrl)
1770 {
1771         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1772         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1773         u32 val;
1774
1775         switch (ctrl->id) {
1776         case V4L2_CID_SHARPNESS:
1777                 val = ceu_read(pcdev, CLFCR);
1778                 ctrl->value = val ^ 1;
1779                 return 0;
1780         }
1781         return -ENOIOCTLCMD;
1782 }
1783
1784 static int sh_mobile_ceu_set_ctrl(struct soc_camera_device *icd,
1785                                   struct v4l2_control *ctrl)
1786 {
1787         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1788         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1789
1790         switch (ctrl->id) {
1791         case V4L2_CID_SHARPNESS:
1792                 switch (icd->current_fmt->host_fmt->fourcc) {
1793                 case V4L2_PIX_FMT_NV12:
1794                 case V4L2_PIX_FMT_NV21:
1795                 case V4L2_PIX_FMT_NV16:
1796                 case V4L2_PIX_FMT_NV61:
1797                         ceu_write(pcdev, CLFCR, !ctrl->value);
1798                         return 0;
1799                 }
1800                 return -EINVAL;
1801         }
1802         return -ENOIOCTLCMD;
1803 }
1804
1805 static const struct v4l2_queryctrl sh_mobile_ceu_controls[] = {
1806         {
1807                 .id             = V4L2_CID_SHARPNESS,
1808                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
1809                 .name           = "Low-pass filter",
1810                 .minimum        = 0,
1811                 .maximum        = 1,
1812                 .step           = 1,
1813                 .default_value  = 0,
1814         },
1815 };
1816
1817 static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
1818         .owner          = THIS_MODULE,
1819         .add            = sh_mobile_ceu_add_device,
1820         .remove         = sh_mobile_ceu_remove_device,
1821         .get_formats    = sh_mobile_ceu_get_formats,
1822         .put_formats    = sh_mobile_ceu_put_formats,
1823         .set_crop       = sh_mobile_ceu_set_crop,
1824         .set_fmt        = sh_mobile_ceu_set_fmt,
1825         .try_fmt        = sh_mobile_ceu_try_fmt,
1826         .set_ctrl       = sh_mobile_ceu_set_ctrl,
1827         .get_ctrl       = sh_mobile_ceu_get_ctrl,
1828         .set_parm       = sh_mobile_ceu_set_parm,
1829         .get_parm       = sh_mobile_ceu_get_parm,
1830         .reqbufs        = sh_mobile_ceu_reqbufs,
1831         .poll           = sh_mobile_ceu_poll,
1832         .querycap       = sh_mobile_ceu_querycap,
1833         .set_bus_param  = sh_mobile_ceu_set_bus_param,
1834         .init_videobuf  = sh_mobile_ceu_init_videobuf,
1835         .controls       = sh_mobile_ceu_controls,
1836         .num_controls   = ARRAY_SIZE(sh_mobile_ceu_controls),
1837 };
1838
1839 static int __devinit sh_mobile_ceu_probe(struct platform_device *pdev)
1840 {
1841         struct sh_mobile_ceu_dev *pcdev;
1842         struct resource *res;
1843         void __iomem *base;
1844         unsigned int irq;
1845         int err = 0;
1846
1847         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1848         irq = platform_get_irq(pdev, 0);
1849         if (!res || (int)irq <= 0) {
1850                 dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
1851                 err = -ENODEV;
1852                 goto exit;
1853         }
1854
1855         pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
1856         if (!pcdev) {
1857                 dev_err(&pdev->dev, "Could not allocate pcdev\n");
1858                 err = -ENOMEM;
1859                 goto exit;
1860         }
1861
1862         INIT_LIST_HEAD(&pcdev->capture);
1863         spin_lock_init(&pcdev->lock);
1864
1865         pcdev->pdata = pdev->dev.platform_data;
1866         if (!pcdev->pdata) {
1867                 err = -EINVAL;
1868                 dev_err(&pdev->dev, "CEU platform data not set.\n");
1869                 goto exit_kfree;
1870         }
1871
1872         base = ioremap_nocache(res->start, resource_size(res));
1873         if (!base) {
1874                 err = -ENXIO;
1875                 dev_err(&pdev->dev, "Unable to ioremap CEU registers.\n");
1876                 goto exit_kfree;
1877         }
1878
1879         pcdev->irq = irq;
1880         pcdev->base = base;
1881         pcdev->video_limit = 0; /* only enabled if second resource exists */
1882
1883         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1884         if (res) {
1885                 err = dma_declare_coherent_memory(&pdev->dev, res->start,
1886                                                   res->start,
1887                                                   resource_size(res),
1888                                                   DMA_MEMORY_MAP |
1889                                                   DMA_MEMORY_EXCLUSIVE);
1890                 if (!err) {
1891                         dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
1892                         err = -ENXIO;
1893                         goto exit_iounmap;
1894                 }
1895
1896                 pcdev->video_limit = resource_size(res);
1897         }
1898
1899         /* request irq */
1900         err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED,
1901                           dev_name(&pdev->dev), pcdev);
1902         if (err) {
1903                 dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
1904                 goto exit_release_mem;
1905         }
1906
1907         pm_suspend_ignore_children(&pdev->dev, true);
1908         pm_runtime_enable(&pdev->dev);
1909         pm_runtime_resume(&pdev->dev);
1910
1911         pcdev->ici.priv = pcdev;
1912         pcdev->ici.v4l2_dev.dev = &pdev->dev;
1913         pcdev->ici.nr = pdev->id;
1914         pcdev->ici.drv_name = dev_name(&pdev->dev);
1915         pcdev->ici.ops = &sh_mobile_ceu_host_ops;
1916
1917         err = soc_camera_host_register(&pcdev->ici);
1918         if (err)
1919                 goto exit_free_clk;
1920
1921         return 0;
1922
1923 exit_free_clk:
1924         pm_runtime_disable(&pdev->dev);
1925         free_irq(pcdev->irq, pcdev);
1926 exit_release_mem:
1927         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
1928                 dma_release_declared_memory(&pdev->dev);
1929 exit_iounmap:
1930         iounmap(base);
1931 exit_kfree:
1932         kfree(pcdev);
1933 exit:
1934         return err;
1935 }
1936
1937 static int __devexit sh_mobile_ceu_remove(struct platform_device *pdev)
1938 {
1939         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
1940         struct sh_mobile_ceu_dev *pcdev = container_of(soc_host,
1941                                         struct sh_mobile_ceu_dev, ici);
1942
1943         soc_camera_host_unregister(soc_host);
1944         pm_runtime_disable(&pdev->dev);
1945         free_irq(pcdev->irq, pcdev);
1946         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
1947                 dma_release_declared_memory(&pdev->dev);
1948         iounmap(pcdev->base);
1949         kfree(pcdev);
1950         return 0;
1951 }
1952
1953 static int sh_mobile_ceu_runtime_nop(struct device *dev)
1954 {
1955         /* Runtime PM callback shared between ->runtime_suspend()
1956          * and ->runtime_resume(). Simply returns success.
1957          *
1958          * This driver re-initializes all registers after
1959          * pm_runtime_get_sync() anyway so there is no need
1960          * to save and restore registers here.
1961          */
1962         return 0;
1963 }
1964
1965 static const struct dev_pm_ops sh_mobile_ceu_dev_pm_ops = {
1966         .runtime_suspend = sh_mobile_ceu_runtime_nop,
1967         .runtime_resume = sh_mobile_ceu_runtime_nop,
1968 };
1969
1970 static struct platform_driver sh_mobile_ceu_driver = {
1971         .driver         = {
1972                 .name   = "sh_mobile_ceu",
1973                 .pm     = &sh_mobile_ceu_dev_pm_ops,
1974         },
1975         .probe          = sh_mobile_ceu_probe,
1976         .remove         = __devexit_p(sh_mobile_ceu_remove),
1977 };
1978
1979 static int __init sh_mobile_ceu_init(void)
1980 {
1981         return platform_driver_register(&sh_mobile_ceu_driver);
1982 }
1983
1984 static void __exit sh_mobile_ceu_exit(void)
1985 {
1986         platform_driver_unregister(&sh_mobile_ceu_driver);
1987 }
1988
1989 module_init(sh_mobile_ceu_init);
1990 module_exit(sh_mobile_ceu_exit);
1991
1992 MODULE_DESCRIPTION("SuperH Mobile CEU driver");
1993 MODULE_AUTHOR("Magnus Damm");
1994 MODULE_LICENSE("GPL");
1995 MODULE_ALIAS("platform:sh_mobile_ceu");