Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/drivers/media/platform/soc_camera/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/completion.h>
 21 #include <linux/delay.h>
 22 #include <linux/dma-mapping.h>
 23 #include <linux/err.h>
 24 #include <linux/errno.h>
 25 #include <linux/fs.h>
 26 #include <linux/interrupt.h>
 27 #include <linux/kernel.h>
 28 #include <linux/mm.h>
 29 #include <linux/moduleparam.h>
 30 #include <linux/of.h>
 31 #include <linux/time.h>
 32 #include <linux/slab.h>
 33 #include <linux/device.h>
 34 #include <linux/platform_device.h>
 35 #include <linux/videodev2.h>
 36 #include <linux/pm_runtime.h>
 37 #include <linux/sched.h>
 38 
 39 #include <media/v4l2-async.h>
 40 #include <media/v4l2-common.h>
 41 #include <media/v4l2-dev.h>
 42 #include <media/soc_camera.h>
 43 #include <media/drv-intf/sh_mobile_ceu.h>
 44 #include <media/videobuf2-dma-contig.h>
 45 #include <media/v4l2-mediabus.h>
 46 #include <media/drv-intf/soc_mediabus.h>
 47 
 48 #include "soc_scale_crop.h"
 49 
 50 /* register offsets for sh7722 / sh7723 */
 51 
 52 #define CAPSR  0x00 /* Capture start register */
 53 #define CAPCR  0x04 /* Capture control register */
 54 #define CAMCR  0x08 /* Capture interface control register */
 55 #define CMCYR  0x0c /* Capture interface cycle  register */
 56 #define CAMOR  0x10 /* Capture interface offset register */
 57 #define CAPWR  0x14 /* Capture interface width register */
 58 #define CAIFR  0x18 /* Capture interface input format register */
 59 #define CSTCR  0x20 /* Camera strobe control register (<= sh7722) */
 60 #define CSECR  0x24 /* Camera strobe emission count register (<= sh7722) */
 61 #define CRCNTR 0x28 /* CEU register control register */
 62 #define CRCMPR 0x2c /* CEU register forcible control register */
 63 #define CFLCR  0x30 /* Capture filter control register */
 64 #define CFSZR  0x34 /* Capture filter size clip register */
 65 #define CDWDR  0x38 /* Capture destination width register */
 66 #define CDAYR  0x3c /* Capture data address Y register */
 67 #define CDACR  0x40 /* Capture data address C register */
 68 #define CDBYR  0x44 /* Capture data bottom-field address Y register */
 69 #define CDBCR  0x48 /* Capture data bottom-field address C register */
 70 #define CBDSR  0x4c /* Capture bundle destination size register */
 71 #define CFWCR  0x5c /* Firewall operation control register */
 72 #define CLFCR  0x60 /* Capture low-pass filter control register */
 73 #define CDOCR  0x64 /* Capture data output control register */
 74 #define CDDCR  0x68 /* Capture data complexity level register */
 75 #define CDDAR  0x6c /* Capture data complexity level address register */
 76 #define CEIER  0x70 /* Capture event interrupt enable register */
 77 #define CETCR  0x74 /* Capture event flag clear register */
 78 #define CSTSR  0x7c /* Capture status register */
 79 #define CSRTR  0x80 /* Capture software reset register */
 80 #define CDSSR  0x84 /* Capture data size register */
 81 #define CDAYR2 0x90 /* Capture data address Y register 2 */
 82 #define CDACR2 0x94 /* Capture data address C register 2 */
 83 #define CDBYR2 0x98 /* Capture data bottom-field address Y register 2 */
 84 #define CDBCR2 0x9c /* Capture data bottom-field address C register 2 */
 85 
 86 #undef DEBUG_GEOMETRY
 87 #ifdef DEBUG_GEOMETRY
 88 #define dev_geo dev_info
 89 #else
 90 #define dev_geo dev_dbg
 91 #endif
 92 
 93 /* per video frame buffer */
 94 struct sh_mobile_ceu_buffer {
 95         struct vb2_v4l2_buffer vb; /* v4l buffer must be first */
 96         struct list_head queue;
 97 };
 98 
 99 struct sh_mobile_ceu_dev {
100         struct soc_camera_host ici;
101 
102         unsigned int irq;
103         void __iomem *base;
104         size_t video_limit;
105         size_t buf_total;
106 
107         spinlock_t lock;                /* Protects video buffer lists */
108         struct list_head capture;
109         struct vb2_v4l2_buffer *active;
110 
111         struct sh_mobile_ceu_info *pdata;
112         struct completion complete;
113 
114         u32 cflcr;
115 
116         /* static max sizes either from platform data or default */
117         int max_width;
118         int max_height;
119 
120         enum v4l2_field field;
121         int sequence;
122         unsigned long flags;
123 
124         unsigned int image_mode:1;
125         unsigned int is_16bit:1;
126         unsigned int frozen:1;
127 };
128 
129 struct sh_mobile_ceu_cam {
130         /* CEU offsets within the camera output, before the CEU scaler */
131         unsigned int ceu_left;
132         unsigned int ceu_top;
133         /* Client output, as seen by the CEU */
134         unsigned int width;
135         unsigned int height;
136         /*
137          * User window from S_SELECTION / G_SELECTION, produced by client cropping and
138          * scaling, CEU scaling and CEU cropping, mapped back onto the client
139          * input window
140          */
141         struct v4l2_rect subrect;
142         /* Camera cropping rectangle */
143         struct v4l2_rect rect;
144         const struct soc_mbus_pixelfmt *extra_fmt;
145         u32 code;
146 };
147 
148 static struct sh_mobile_ceu_buffer *to_ceu_vb(struct vb2_v4l2_buffer *vbuf)
149 {
150         return container_of(vbuf, struct sh_mobile_ceu_buffer, vb);
151 }
152 
153 static void ceu_write(struct sh_mobile_ceu_dev *priv,
154                       unsigned long reg_offs, u32 data)
155 {
156         iowrite32(data, priv->base + reg_offs);
157 }
158 
159 static u32 ceu_read(struct sh_mobile_ceu_dev *priv, unsigned long reg_offs)
160 {
161         return ioread32(priv->base + reg_offs);
162 }
163 
164 static int sh_mobile_ceu_soft_reset(struct sh_mobile_ceu_dev *pcdev)
165 {
166         int i, success = 0;
167 
168         ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
169 
170         /* wait CSTSR.CPTON bit */
171         for (i = 0; i < 1000; i++) {
172                 if (!(ceu_read(pcdev, CSTSR) & 1)) {
173                         success++;
174                         break;
175                 }
176                 udelay(1);
177         }
178 
179         /* wait CAPSR.CPKIL bit */
180         for (i = 0; i < 1000; i++) {
181                 if (!(ceu_read(pcdev, CAPSR) & (1 << 16))) {
182                         success++;
183                         break;
184                 }
185                 udelay(1);
186         }
187 
188         if (2 != success) {
189                 dev_warn(pcdev->ici.v4l2_dev.dev, "soft reset time out\n");
190                 return -EIO;
191         }
192 
193         return 0;
194 }
195 
196 /*
197  *  Videobuf operations
198  */
199 
200 /*
201  * .queue_setup() is called to check, whether the driver can accept the
202  *                requested number of buffers and to fill in plane sizes
203  *                for the current frame format if required
204  */
205 static int sh_mobile_ceu_videobuf_setup(struct vb2_queue *vq,
206                         unsigned int *count, unsigned int *num_planes,
207                         unsigned int sizes[], struct device *alloc_devs[])
208 {
209         struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
210         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
211         struct sh_mobile_ceu_dev *pcdev = ici->priv;
212 
213         if (!vq->num_buffers)
214                 pcdev->sequence = 0;
215 
216         if (!*count)
217                 *count = 2;
218 
219         /* Called from VIDIOC_REQBUFS or in compatibility mode */
220         if (!*num_planes)
221                 sizes[0] = icd->sizeimage;
222         else if (sizes[0] < icd->sizeimage)
223                 return -EINVAL;
224 
225         /* If *num_planes != 0, we have already verified *count. */
226         if (pcdev->video_limit) {
227                 size_t size = PAGE_ALIGN(sizes[0]) * *count;
228 
229                 if (size + pcdev->buf_total > pcdev->video_limit)
230                         *count = (pcdev->video_limit - pcdev->buf_total) /
231                                 PAGE_ALIGN(sizes[0]);
232         }
233 
234         *num_planes = 1;
235 
236         dev_dbg(icd->parent, "count=%d, size=%u\n", *count, sizes[0]);
237 
238         return 0;
239 }
240 
241 #define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */
242 #define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */
243 #define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */
244 #define CEU_CEIER_VBP   (1 << 20) /* vbp error */
245 #define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */
246 #define CEU_CEIER_MASK (CEU_CEIER_CPEIE | CEU_CEIER_VBP)
247 
248 
249 /*
250  * return value doesn't reflex the success/failure to queue the new buffer,
251  * but rather the status of the previous buffer.
252  */
253 static int sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
254 {
255         struct soc_camera_device *icd = pcdev->ici.icd;
256         dma_addr_t phys_addr_top, phys_addr_bottom;
257         unsigned long top1, top2;
258         unsigned long bottom1, bottom2;
259         u32 status;
260         bool planar;
261         int ret = 0;
262 
263         /*
264          * The hardware is _very_ picky about this sequence. Especially
265          * the CEU_CETCR_MAGIC value. It seems like we need to acknowledge
266          * several not-so-well documented interrupt sources in CETCR.
267          */
268         ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_MASK);
269         status = ceu_read(pcdev, CETCR);
270         ceu_write(pcdev, CETCR, ~status & CEU_CETCR_MAGIC);
271         if (!pcdev->frozen)
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->frozen) {
287                 complete(&pcdev->complete);
288                 return ret;
289         }
290 
291         if (!pcdev->active)
292                 return ret;
293 
294         if (V4L2_FIELD_INTERLACED_BT == pcdev->field) {
295                 top1    = CDBYR;
296                 top2    = CDBCR;
297                 bottom1 = CDAYR;
298                 bottom2 = CDACR;
299         } else {
300                 top1    = CDAYR;
301                 top2    = CDACR;
302                 bottom1 = CDBYR;
303                 bottom2 = CDBCR;
304         }
305 
306         phys_addr_top =
307                 vb2_dma_contig_plane_dma_addr(&pcdev->active->vb2_buf, 0);
308 
309         switch (icd->current_fmt->host_fmt->fourcc) {
310         case V4L2_PIX_FMT_NV12:
311         case V4L2_PIX_FMT_NV21:
312         case V4L2_PIX_FMT_NV16:
313         case V4L2_PIX_FMT_NV61:
314                 planar = true;
315                 break;
316         default:
317                 planar = false;
318         }
319 
320         ceu_write(pcdev, top1, phys_addr_top);
321         if (V4L2_FIELD_NONE != pcdev->field) {
322                 phys_addr_bottom = phys_addr_top + icd->bytesperline;
323                 ceu_write(pcdev, bottom1, phys_addr_bottom);
324         }
325 
326         if (planar) {
327                 phys_addr_top += icd->bytesperline * icd->user_height;
328                 ceu_write(pcdev, top2, phys_addr_top);
329                 if (V4L2_FIELD_NONE != pcdev->field) {
330                         phys_addr_bottom = phys_addr_top + icd->bytesperline;
331                         ceu_write(pcdev, bottom2, phys_addr_bottom);
332                 }
333         }
334 
335         ceu_write(pcdev, CAPSR, 0x1); /* start capture */
336 
337         return ret;
338 }
339 
340 static int sh_mobile_ceu_videobuf_prepare(struct vb2_buffer *vb)
341 {
342         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
343         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vbuf);
344 
345         /* Added list head initialization on alloc */
346         WARN(!list_empty(&buf->queue), "Buffer %p on queue!\n", vb);
347 
348         return 0;
349 }
350 
351 static void sh_mobile_ceu_videobuf_queue(struct vb2_buffer *vb)
352 {
353         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
354         struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
355         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
356         struct sh_mobile_ceu_dev *pcdev = ici->priv;
357         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vbuf);
358         unsigned long size;
359 
360         size = icd->sizeimage;
361 
362         if (vb2_plane_size(vb, 0) < size) {
363                 dev_err(icd->parent, "Buffer #%d too small (%lu < %lu)\n",
364                         vb->index, vb2_plane_size(vb, 0), size);
365                 goto error;
366         }
367 
368         vb2_set_plane_payload(vb, 0, size);
369 
370         dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
371                 vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
372 
373 #ifdef DEBUG
374         /*
375          * This can be useful if you want to see if we actually fill
376          * the buffer with something
377          */
378         if (vb2_plane_vaddr(vb, 0))
379                 memset(vb2_plane_vaddr(vb, 0), 0xaa, vb2_get_plane_payload(vb, 0));
380 #endif
381 
382         spin_lock_irq(&pcdev->lock);
383         list_add_tail(&buf->queue, &pcdev->capture);
384 
385         if (!pcdev->active) {
386                 /*
387                  * Because there were no active buffer at this moment,
388                  * we are not interested in the return value of
389                  * sh_mobile_ceu_capture here.
390                  */
391                 pcdev->active = vbuf;
392                 sh_mobile_ceu_capture(pcdev);
393         }
394         spin_unlock_irq(&pcdev->lock);
395 
396         return;
397 
398 error:
399         vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
400 }
401 
402 static void sh_mobile_ceu_videobuf_release(struct vb2_buffer *vb)
403 {
404         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
405         struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
406         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
407         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vbuf);
408         struct sh_mobile_ceu_dev *pcdev = ici->priv;
409 
410         spin_lock_irq(&pcdev->lock);
411 
412         if (pcdev->active == vbuf) {
413                 /* disable capture (release DMA buffer), reset */
414                 ceu_write(pcdev, CAPSR, 1 << 16);
415                 pcdev->active = NULL;
416         }
417 
418         /*
419          * Doesn't hurt also if the list is empty, but it hurts, if queuing the
420          * buffer failed, and .buf_init() hasn't been called
421          */
422         if (buf->queue.next)
423                 list_del_init(&buf->queue);
424 
425         pcdev->buf_total -= PAGE_ALIGN(vb2_plane_size(vb, 0));
426         dev_dbg(icd->parent, "%s() %zu bytes buffers\n", __func__,
427                 pcdev->buf_total);
428 
429         spin_unlock_irq(&pcdev->lock);
430 }
431 
432 static int sh_mobile_ceu_videobuf_init(struct vb2_buffer *vb)
433 {
434         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
435         struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
436         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
437         struct sh_mobile_ceu_dev *pcdev = ici->priv;
438 
439         pcdev->buf_total += PAGE_ALIGN(vb2_plane_size(vb, 0));
440         dev_dbg(icd->parent, "%s() %zu bytes buffers\n", __func__,
441                 pcdev->buf_total);
442 
443         /* This is for locking debugging only */
444         INIT_LIST_HEAD(&to_ceu_vb(vbuf)->queue);
445         return 0;
446 }
447 
448 static void sh_mobile_ceu_stop_streaming(struct vb2_queue *q)
449 {
450         struct soc_camera_device *icd = soc_camera_from_vb2q(q);
451         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
452         struct sh_mobile_ceu_dev *pcdev = ici->priv;
453         struct list_head *buf_head, *tmp;
454 
455         spin_lock_irq(&pcdev->lock);
456 
457         pcdev->active = NULL;
458 
459         list_for_each_safe(buf_head, tmp, &pcdev->capture)
460                 list_del_init(buf_head);
461 
462         spin_unlock_irq(&pcdev->lock);
463 
464         sh_mobile_ceu_soft_reset(pcdev);
465 }
466 
467 static const struct vb2_ops sh_mobile_ceu_videobuf_ops = {
468         .queue_setup    = sh_mobile_ceu_videobuf_setup,
469         .buf_prepare    = sh_mobile_ceu_videobuf_prepare,
470         .buf_queue      = sh_mobile_ceu_videobuf_queue,
471         .buf_cleanup    = sh_mobile_ceu_videobuf_release,
472         .buf_init       = sh_mobile_ceu_videobuf_init,
473         .wait_prepare   = vb2_ops_wait_prepare,
474         .wait_finish    = vb2_ops_wait_finish,
475         .stop_streaming = sh_mobile_ceu_stop_streaming,
476 };
477 
478 static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
479 {
480         struct sh_mobile_ceu_dev *pcdev = data;
481         struct vb2_v4l2_buffer *vbuf;
482         int ret;
483 
484         spin_lock(&pcdev->lock);
485 
486         vbuf = pcdev->active;
487         if (!vbuf)
488                 /* Stale interrupt from a released buffer */
489                 goto out;
490 
491         list_del_init(&to_ceu_vb(vbuf)->queue);
492 
493         if (!list_empty(&pcdev->capture))
494                 pcdev->active = &list_entry(pcdev->capture.next,
495                                             struct sh_mobile_ceu_buffer, queue)->vb;
496         else
497                 pcdev->active = NULL;
498 
499         ret = sh_mobile_ceu_capture(pcdev);
500         vbuf->vb2_buf.timestamp = ktime_get_ns();
501         if (!ret) {
502                 vbuf->field = pcdev->field;
503                 vbuf->sequence = pcdev->sequence++;
504         }
505         vb2_buffer_done(&vbuf->vb2_buf,
506                         ret < 0 ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
507 
508 out:
509         spin_unlock(&pcdev->lock);
510 
511         return IRQ_HANDLED;
512 }
513 
514 static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
515 {
516         dev_info(icd->parent,
517                  "SuperH Mobile CEU driver attached to camera %d\n",
518                  icd->devnum);
519 
520         return 0;
521 }
522 
523 static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
524 {
525         dev_info(icd->parent,
526                  "SuperH Mobile CEU driver detached from camera %d\n",
527                  icd->devnum);
528 }
529 
530 /* Called with .host_lock held */
531 static int sh_mobile_ceu_clock_start(struct soc_camera_host *ici)
532 {
533         struct sh_mobile_ceu_dev *pcdev = ici->priv;
534 
535         pm_runtime_get_sync(ici->v4l2_dev.dev);
536 
537         pcdev->buf_total = 0;
538 
539         sh_mobile_ceu_soft_reset(pcdev);
540 
541         return 0;
542 }
543 
544 /* Called with .host_lock held */
545 static void sh_mobile_ceu_clock_stop(struct soc_camera_host *ici)
546 {
547         struct sh_mobile_ceu_dev *pcdev = ici->priv;
548 
549         /* disable capture, disable interrupts */
550         ceu_write(pcdev, CEIER, 0);
551         sh_mobile_ceu_soft_reset(pcdev);
552 
553         /* make sure active buffer is canceled */
554         spin_lock_irq(&pcdev->lock);
555         if (pcdev->active) {
556                 list_del_init(&to_ceu_vb(pcdev->active)->queue);
557                 vb2_buffer_done(&pcdev->active->vb2_buf, VB2_BUF_STATE_ERROR);
558                 pcdev->active = NULL;
559         }
560         spin_unlock_irq(&pcdev->lock);
561 
562         pm_runtime_put(ici->v4l2_dev.dev);
563 }
564 
565 /*
566  * See chapter 29.4.12 "Capture Filter Control Register (CFLCR)"
567  * in SH7722 Hardware Manual
568  */
569 static unsigned int size_dst(unsigned int src, unsigned int scale)
570 {
571         unsigned int mant_pre = scale >> 12;
572         if (!src || !scale)
573                 return src;
574         return ((mant_pre + 2 * (src - 1)) / (2 * mant_pre) - 1) *
575                 mant_pre * 4096 / scale + 1;
576 }
577 
578 static u16 calc_scale(unsigned int src, unsigned int *dst)
579 {
580         u16 scale;
581 
582         if (src == *dst)
583                 return 0;
584 
585         scale = (src * 4096 / *dst) & ~7;
586 
587         while (scale > 4096 && size_dst(src, scale) < *dst)
588                 scale -= 8;
589 
590         *dst = size_dst(src, scale);
591 
592         return scale;
593 }
594 
595 /* rect is guaranteed to not exceed the scaled camera rectangle */
596 static void sh_mobile_ceu_set_rect(struct soc_camera_device *icd)
597 {
598         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
599         struct sh_mobile_ceu_cam *cam = icd->host_priv;
600         struct sh_mobile_ceu_dev *pcdev = ici->priv;
601         unsigned int height, width, cdwdr_width, in_width, in_height;
602         unsigned int left_offset, top_offset;
603         u32 camor;
604 
605         dev_geo(icd->parent, "Crop %ux%u@%u:%u\n",
606                 icd->user_width, icd->user_height, cam->ceu_left, cam->ceu_top);
607 
608         left_offset     = cam->ceu_left;
609         top_offset      = cam->ceu_top;
610 
611         WARN_ON(icd->user_width & 3 || icd->user_height & 3);
612 
613         width = icd->user_width;
614 
615         if (pcdev->image_mode) {
616                 in_width = cam->width;
617                 if (!pcdev->is_16bit) {
618                         in_width *= 2;
619                         left_offset *= 2;
620                 }
621         } else {
622                 unsigned int w_factor;
623 
624                 switch (icd->current_fmt->host_fmt->packing) {
625                 case SOC_MBUS_PACKING_2X8_PADHI:
626                         w_factor = 2;
627                         break;
628                 default:
629                         w_factor = 1;
630                 }
631 
632                 in_width = cam->width * w_factor;
633                 left_offset *= w_factor;
634         }
635 
636         cdwdr_width = icd->bytesperline;
637 
638         height = icd->user_height;
639         in_height = cam->height;
640         if (V4L2_FIELD_NONE != pcdev->field) {
641                 height = (height / 2) & ~3;
642                 in_height /= 2;
643                 top_offset /= 2;
644                 cdwdr_width *= 2;
645         }
646 
647         /* Set CAMOR, CAPWR, CFSZR, take care of CDWDR */
648         camor = left_offset | (top_offset << 16);
649 
650         dev_geo(icd->parent,
651                 "CAMOR 0x%x, CAPWR 0x%x, CFSZR 0x%x, CDWDR 0x%x\n", camor,
652                 (in_height << 16) | in_width, (height << 16) | width,
653                 cdwdr_width);
654 
655         ceu_write(pcdev, CAMOR, camor);
656         ceu_write(pcdev, CAPWR, (in_height << 16) | in_width);
657         /* CFSZR clipping is applied _after_ the scaling filter (CFLCR) */
658         ceu_write(pcdev, CFSZR, (height << 16) | width);
659         ceu_write(pcdev, CDWDR, cdwdr_width);
660 }
661 
662 static u32 capture_save_reset(struct sh_mobile_ceu_dev *pcdev)
663 {
664         u32 capsr = ceu_read(pcdev, CAPSR);
665         ceu_write(pcdev, CAPSR, 1 << 16); /* reset, stop capture */
666         return capsr;
667 }
668 
669 static void capture_restore(struct sh_mobile_ceu_dev *pcdev, u32 capsr)
670 {
671         unsigned long timeout = jiffies + 10 * HZ;
672 
673         /*
674          * Wait until the end of the current frame. It can take a long time,
675          * but if it has been aborted by a CAPSR reset, it shoule exit sooner.
676          */
677         while ((ceu_read(pcdev, CSTSR) & 1) && time_before(jiffies, timeout))
678                 msleep(1);
679 
680         if (time_after(jiffies, timeout)) {
681                 dev_err(pcdev->ici.v4l2_dev.dev,
682                         "Timeout waiting for frame end! Interface problem?\n");
683                 return;
684         }
685 
686         /* Wait until reset clears, this shall not hang... */
687         while (ceu_read(pcdev, CAPSR) & (1 << 16))
688                 udelay(10);
689 
690         /* Anything to restore? */
691         if (capsr & ~(1 << 16))
692                 ceu_write(pcdev, CAPSR, capsr);
693 }
694 
695 #define CEU_BUS_FLAGS (V4L2_MBUS_MASTER |       \
696                 V4L2_MBUS_PCLK_SAMPLE_RISING |  \
697                 V4L2_MBUS_HSYNC_ACTIVE_HIGH |   \
698                 V4L2_MBUS_HSYNC_ACTIVE_LOW |    \
699                 V4L2_MBUS_VSYNC_ACTIVE_HIGH |   \
700                 V4L2_MBUS_VSYNC_ACTIVE_LOW |    \
701                 V4L2_MBUS_DATA_ACTIVE_HIGH)
702 
703 /* Capture is not running, no interrupts, no locking needed */
704 static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd)
705 {
706         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
707         struct sh_mobile_ceu_dev *pcdev = ici->priv;
708         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
709         struct sh_mobile_ceu_cam *cam = icd->host_priv;
710         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
711         unsigned long value, common_flags = CEU_BUS_FLAGS;
712         u32 capsr = capture_save_reset(pcdev);
713         unsigned int yuv_lineskip;
714         int ret;
715 
716         /*
717          * If the client doesn't implement g_mbus_config, we just use our
718          * platform data
719          */
720         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
721         if (!ret) {
722                 common_flags = soc_mbus_config_compatible(&cfg,
723                                                           common_flags);
724                 if (!common_flags)
725                         return -EINVAL;
726         } else if (ret != -ENOIOCTLCMD) {
727                 return ret;
728         }
729 
730         /* Make choises, based on platform preferences */
731         if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
732             (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
733                 if (pcdev->flags & SH_CEU_FLAG_HSYNC_LOW)
734                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
735                 else
736                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
737         }
738 
739         if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
740             (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
741                 if (pcdev->flags & SH_CEU_FLAG_VSYNC_LOW)
742                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
743                 else
744                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
745         }
746 
747         cfg.flags = common_flags;
748         ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
749         if (ret < 0 && ret != -ENOIOCTLCMD)
750                 return ret;
751 
752         if (icd->current_fmt->host_fmt->bits_per_sample > 8)
753                 pcdev->is_16bit = 1;
754         else
755                 pcdev->is_16bit = 0;
756 
757         ceu_write(pcdev, CRCNTR, 0);
758         ceu_write(pcdev, CRCMPR, 0);
759 
760         value = 0x00000010; /* data fetch by default */
761         yuv_lineskip = 0x10;
762 
763         switch (icd->current_fmt->host_fmt->fourcc) {
764         case V4L2_PIX_FMT_NV12:
765         case V4L2_PIX_FMT_NV21:
766                 /* convert 4:2:2 -> 4:2:0 */
767                 yuv_lineskip = 0; /* skip for NV12/21, no skip for NV16/61 */
768                 /* fall-through */
769         case V4L2_PIX_FMT_NV16:
770         case V4L2_PIX_FMT_NV61:
771                 switch (cam->code) {
772                 case MEDIA_BUS_FMT_UYVY8_2X8:
773                         value = 0x00000000; /* Cb0, Y0, Cr0, Y1 */
774                         break;
775                 case MEDIA_BUS_FMT_VYUY8_2X8:
776                         value = 0x00000100; /* Cr0, Y0, Cb0, Y1 */
777                         break;
778                 case MEDIA_BUS_FMT_YUYV8_2X8:
779                         value = 0x00000200; /* Y0, Cb0, Y1, Cr0 */
780                         break;
781                 case MEDIA_BUS_FMT_YVYU8_2X8:
782                         value = 0x00000300; /* Y0, Cr0, Y1, Cb0 */
783                         break;
784                 default:
785                         BUG();
786                 }
787         }
788 
789         if (icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV21 ||
790             icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV61)
791                 value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */
792 
793         value |= common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
794         value |= common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
795 
796         if (pcdev->is_16bit)
797                 value |= 1 << 12;
798         else if (pcdev->flags & SH_CEU_FLAG_LOWER_8BIT)
799                 value |= 2 << 12;
800 
801         ceu_write(pcdev, CAMCR, value);
802 
803         ceu_write(pcdev, CAPCR, 0x00300000);
804 
805         switch (pcdev->field) {
806         case V4L2_FIELD_INTERLACED_TB:
807                 value = 0x101;
808                 break;
809         case V4L2_FIELD_INTERLACED_BT:
810                 value = 0x102;
811                 break;
812         default:
813                 value = 0;
814                 break;
815         }
816         ceu_write(pcdev, CAIFR, value);
817 
818         sh_mobile_ceu_set_rect(icd);
819         mdelay(1);
820 
821         dev_geo(icd->parent, "CFLCR 0x%x\n", pcdev->cflcr);
822         ceu_write(pcdev, CFLCR, pcdev->cflcr);
823 
824         /*
825          * A few words about byte order (observed in Big Endian mode)
826          *
827          * In data fetch mode bytes are received in chunks of 8 bytes.
828          * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
829          *
830          * The data is however by default written to memory in reverse order:
831          * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
832          *
833          * The lowest three bits of CDOCR allows us to do swapping,
834          * using 7 we swap the data bytes to match the incoming order:
835          * D0, D1, D2, D3, D4, D5, D6, D7
836          */
837         value = 0x00000007 | yuv_lineskip;
838 
839         ceu_write(pcdev, CDOCR, value);
840         ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
841 
842         capture_restore(pcdev, capsr);
843 
844         /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
845         return 0;
846 }
847 
848 static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd,
849                                        unsigned char buswidth)
850 {
851         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
852         unsigned long common_flags = CEU_BUS_FLAGS;
853         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
854         int ret;
855 
856         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
857         if (!ret)
858                 common_flags = soc_mbus_config_compatible(&cfg,
859                                                           common_flags);
860         else if (ret != -ENOIOCTLCMD)
861                 return ret;
862 
863         if (!common_flags || buswidth > 16)
864                 return -EINVAL;
865 
866         return 0;
867 }
868 
869 static const struct soc_mbus_pixelfmt sh_mobile_ceu_formats[] = {
870         {
871                 .fourcc                 = V4L2_PIX_FMT_NV12,
872                 .name                   = "NV12",
873                 .bits_per_sample        = 8,
874                 .packing                = SOC_MBUS_PACKING_1_5X8,
875                 .order                  = SOC_MBUS_ORDER_LE,
876                 .layout                 = SOC_MBUS_LAYOUT_PLANAR_2Y_C,
877         }, {
878                 .fourcc                 = V4L2_PIX_FMT_NV21,
879                 .name                   = "NV21",
880                 .bits_per_sample        = 8,
881                 .packing                = SOC_MBUS_PACKING_1_5X8,
882                 .order                  = SOC_MBUS_ORDER_LE,
883                 .layout                 = SOC_MBUS_LAYOUT_PLANAR_2Y_C,
884         }, {
885                 .fourcc                 = V4L2_PIX_FMT_NV16,
886                 .name                   = "NV16",
887                 .bits_per_sample        = 8,
888                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
889                 .order                  = SOC_MBUS_ORDER_LE,
890                 .layout                 = SOC_MBUS_LAYOUT_PLANAR_Y_C,
891         }, {
892                 .fourcc                 = V4L2_PIX_FMT_NV61,
893                 .name                   = "NV61",
894                 .bits_per_sample        = 8,
895                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
896                 .order                  = SOC_MBUS_ORDER_LE,
897                 .layout                 = SOC_MBUS_LAYOUT_PLANAR_Y_C,
898         },
899 };
900 
901 /* This will be corrected as we get more formats */
902 static bool sh_mobile_ceu_packing_supported(const struct soc_mbus_pixelfmt *fmt)
903 {
904         return  fmt->packing == SOC_MBUS_PACKING_NONE ||
905                 (fmt->bits_per_sample == 8 &&
906                  fmt->packing == SOC_MBUS_PACKING_1_5X8) ||
907                 (fmt->bits_per_sample == 8 &&
908                  fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
909                 (fmt->bits_per_sample > 8 &&
910                  fmt->packing == SOC_MBUS_PACKING_EXTEND16);
911 }
912 
913 static struct soc_camera_device *ctrl_to_icd(struct v4l2_ctrl *ctrl)
914 {
915         return container_of(ctrl->handler, struct soc_camera_device,
916                                                         ctrl_handler);
917 }
918 
919 static int sh_mobile_ceu_s_ctrl(struct v4l2_ctrl *ctrl)
920 {
921         struct soc_camera_device *icd = ctrl_to_icd(ctrl);
922         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
923         struct sh_mobile_ceu_dev *pcdev = ici->priv;
924 
925         switch (ctrl->id) {
926         case V4L2_CID_SHARPNESS:
927                 switch (icd->current_fmt->host_fmt->fourcc) {
928                 case V4L2_PIX_FMT_NV12:
929                 case V4L2_PIX_FMT_NV21:
930                 case V4L2_PIX_FMT_NV16:
931                 case V4L2_PIX_FMT_NV61:
932                         ceu_write(pcdev, CLFCR, !ctrl->val);
933                         return 0;
934                 }
935                 break;
936         }
937 
938         return -EINVAL;
939 }
940 
941 static const struct v4l2_ctrl_ops sh_mobile_ceu_ctrl_ops = {
942         .s_ctrl = sh_mobile_ceu_s_ctrl,
943 };
944 
945 static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, unsigned int idx,
946                                      struct soc_camera_format_xlate *xlate)
947 {
948         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
949         struct device *dev = icd->parent;
950         struct soc_camera_host *ici = to_soc_camera_host(dev);
951         struct sh_mobile_ceu_dev *pcdev = ici->priv;
952         int ret, k, n;
953         int formats = 0;
954         struct sh_mobile_ceu_cam *cam;
955         struct v4l2_subdev_mbus_code_enum code = {
956                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
957                 .index = idx,
958         };
959         const struct soc_mbus_pixelfmt *fmt;
960 
961         ret = v4l2_subdev_call(sd, pad, enum_mbus_code, NULL, &code);
962         if (ret < 0)
963                 /* No more formats */
964                 return 0;
965 
966         fmt = soc_mbus_get_fmtdesc(code.code);
967         if (!fmt) {
968                 dev_warn(dev, "unsupported format code #%u: %d\n", idx, code.code);
969                 return 0;
970         }
971 
972         ret = sh_mobile_ceu_try_bus_param(icd, fmt->bits_per_sample);
973         if (ret < 0)
974                 return 0;
975 
976         if (!icd->host_priv) {
977                 struct v4l2_subdev_format fmt = {
978                         .which = V4L2_SUBDEV_FORMAT_ACTIVE,
979                 };
980                 struct v4l2_mbus_framefmt *mf = &fmt.format;
981                 struct v4l2_rect rect;
982                 int shift = 0;
983 
984                 /* Add our control */
985                 v4l2_ctrl_new_std(&icd->ctrl_handler, &sh_mobile_ceu_ctrl_ops,
986                                   V4L2_CID_SHARPNESS, 0, 1, 1, 1);
987                 if (icd->ctrl_handler.error)
988                         return icd->ctrl_handler.error;
989 
990                 /* FIXME: subwindow is lost between close / open */
991 
992                 /* Cache current client geometry */
993                 ret = soc_camera_client_g_rect(sd, &rect);
994                 if (ret < 0)
995                         return ret;
996 
997                 /* First time */
998                 ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &fmt);
999                 if (ret < 0)
1000                         return ret;
1001 
1002                 /*
1003                  * All currently existing CEU implementations support 2560x1920
1004                  * or larger frames. If the sensor is proposing too big a frame,
1005                  * don't bother with possibly supportred by the CEU larger
1006                  * sizes, just try VGA multiples. If needed, this can be
1007                  * adjusted in the future.
1008                  */
1009                 while ((mf->width > pcdev->max_width ||
1010                         mf->height > pcdev->max_height) && shift < 4) {
1011                         /* Try 2560x1920, 1280x960, 640x480, 320x240 */
1012                         mf->width       = 2560 >> shift;
1013                         mf->height      = 1920 >> shift;
1014                         ret = v4l2_device_call_until_err(sd->v4l2_dev,
1015                                         soc_camera_grp_id(icd), pad,
1016                                         set_fmt, NULL, &fmt);
1017                         if (ret < 0)
1018                                 return ret;
1019                         shift++;
1020                 }
1021 
1022                 if (shift == 4) {
1023                         dev_err(dev, "Failed to configure the client below %ux%x\n",
1024                                 mf->width, mf->height);
1025                         return -EIO;
1026                 }
1027 
1028                 dev_geo(dev, "camera fmt %ux%u\n", mf->width, mf->height);
1029 
1030                 cam = kzalloc(sizeof(*cam), GFP_KERNEL);
1031                 if (!cam)
1032                         return -ENOMEM;
1033 
1034                 /* We are called with current camera crop, initialise subrect with it */
1035                 cam->rect       = rect;
1036                 cam->subrect    = rect;
1037 
1038                 cam->width      = mf->width;
1039                 cam->height     = mf->height;
1040 
1041                 icd->host_priv = cam;
1042         } else {
1043                 cam = icd->host_priv;
1044         }
1045 
1046         /* Beginning of a pass */
1047         if (!idx)
1048                 cam->extra_fmt = NULL;
1049 
1050         switch (code.code) {
1051         case MEDIA_BUS_FMT_UYVY8_2X8:
1052         case MEDIA_BUS_FMT_VYUY8_2X8:
1053         case MEDIA_BUS_FMT_YUYV8_2X8:
1054         case MEDIA_BUS_FMT_YVYU8_2X8:
1055                 if (cam->extra_fmt)
1056                         break;
1057 
1058                 /*
1059                  * Our case is simple so far: for any of the above four camera
1060                  * formats we add all our four synthesized NV* formats, so,
1061                  * just marking the device with a single flag suffices. If
1062                  * the format generation rules are more complex, you would have
1063                  * to actually hang your already added / counted formats onto
1064                  * the host_priv pointer and check whether the format you're
1065                  * going to add now is already there.
1066                  */
1067                 cam->extra_fmt = sh_mobile_ceu_formats;
1068 
1069                 n = ARRAY_SIZE(sh_mobile_ceu_formats);
1070                 formats += n;
1071                 for (k = 0; xlate && k < n; k++) {
1072                         xlate->host_fmt = &sh_mobile_ceu_formats[k];
1073                         xlate->code     = code.code;
1074                         xlate++;
1075                         dev_dbg(dev, "Providing format %s using code %d\n",
1076                                 sh_mobile_ceu_formats[k].name, code.code);
1077                 }
1078                 break;
1079         default:
1080                 if (!sh_mobile_ceu_packing_supported(fmt))
1081                         return 0;
1082         }
1083 
1084         /* Generic pass-through */
1085         formats++;
1086         if (xlate) {
1087                 xlate->host_fmt = fmt;
1088                 xlate->code     = code.code;
1089                 xlate++;
1090                 dev_dbg(dev, "Providing format %s in pass-through mode\n",
1091                         fmt->name);
1092         }
1093 
1094         return formats;
1095 }
1096 
1097 static void sh_mobile_ceu_put_formats(struct soc_camera_device *icd)
1098 {
1099         kfree(icd->host_priv);
1100         icd->host_priv = NULL;
1101 }
1102 
1103 #define scale_down(size, scale) soc_camera_shift_scale(size, 12, scale)
1104 #define calc_generic_scale(in, out) soc_camera_calc_scale(in, 12, out)
1105 
1106 /*
1107  * CEU can scale and crop, but we don't want to waste bandwidth and kill the
1108  * framerate by always requesting the maximum image from the client. See
1109  * Documentation/video4linux/sh_mobile_ceu_camera.txt for a description of
1110  * scaling and cropping algorithms and for the meaning of referenced here steps.
1111  */
1112 static int sh_mobile_ceu_set_selection(struct soc_camera_device *icd,
1113                                        struct v4l2_selection *sel)
1114 {
1115         struct v4l2_rect *rect = &sel->r;
1116         struct device *dev = icd->parent;
1117         struct soc_camera_host *ici = to_soc_camera_host(dev);
1118         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1119         struct v4l2_selection cam_sel;
1120         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1121         struct v4l2_rect *cam_rect = &cam_sel.r;
1122         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1123         struct v4l2_subdev_format fmt = {
1124                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1125         };
1126         struct v4l2_mbus_framefmt *mf = &fmt.format;
1127         unsigned int scale_cam_h, scale_cam_v, scale_ceu_h, scale_ceu_v,
1128                 out_width, out_height;
1129         int interm_width, interm_height;
1130         u32 capsr, cflcr;
1131         int ret;
1132 
1133         dev_geo(dev, "S_SELECTION(%ux%u@%u:%u)\n", rect->width, rect->height,
1134                 rect->left, rect->top);
1135 
1136         /* During camera cropping its output window can change too, stop CEU */
1137         capsr = capture_save_reset(pcdev);
1138         dev_dbg(dev, "CAPSR 0x%x, CFLCR 0x%x\n", capsr, pcdev->cflcr);
1139 
1140         /*
1141          * 1. - 2. Apply iterative camera S_SELECTION for new input window, read back
1142          * actual camera rectangle.
1143          */
1144         ret = soc_camera_client_s_selection(sd, sel, &cam_sel,
1145                                        &cam->rect, &cam->subrect);
1146         if (ret < 0)
1147                 return ret;
1148 
1149         dev_geo(dev, "1-2: camera cropped to %ux%u@%u:%u\n",
1150                 cam_rect->width, cam_rect->height,
1151                 cam_rect->left, cam_rect->top);
1152 
1153         /* On success cam_crop contains current camera crop */
1154 
1155         /* 3. Retrieve camera output window */
1156         ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &fmt);
1157         if (ret < 0)
1158                 return ret;
1159 
1160         if (mf->width > pcdev->max_width || mf->height > pcdev->max_height)
1161                 return -EINVAL;
1162 
1163         /* 4. Calculate camera scales */
1164         scale_cam_h     = calc_generic_scale(cam_rect->width, mf->width);
1165         scale_cam_v     = calc_generic_scale(cam_rect->height, mf->height);
1166 
1167         /* Calculate intermediate window */
1168         interm_width    = scale_down(rect->width, scale_cam_h);
1169         interm_height   = scale_down(rect->height, scale_cam_v);
1170 
1171         if (interm_width < icd->user_width) {
1172                 u32 new_scale_h;
1173 
1174                 new_scale_h = calc_generic_scale(rect->width, icd->user_width);
1175 
1176                 mf->width = scale_down(cam_rect->width, new_scale_h);
1177         }
1178 
1179         if (interm_height < icd->user_height) {
1180                 u32 new_scale_v;
1181 
1182                 new_scale_v = calc_generic_scale(rect->height, icd->user_height);
1183 
1184                 mf->height = scale_down(cam_rect->height, new_scale_v);
1185         }
1186 
1187         if (interm_width < icd->user_width || interm_height < icd->user_height) {
1188                 ret = v4l2_device_call_until_err(sd->v4l2_dev,
1189                                         soc_camera_grp_id(icd), pad,
1190                                         set_fmt, NULL, &fmt);
1191                 if (ret < 0)
1192                         return ret;
1193 
1194                 dev_geo(dev, "New camera output %ux%u\n", mf->width, mf->height);
1195                 scale_cam_h     = calc_generic_scale(cam_rect->width, mf->width);
1196                 scale_cam_v     = calc_generic_scale(cam_rect->height, mf->height);
1197                 interm_width    = scale_down(rect->width, scale_cam_h);
1198                 interm_height   = scale_down(rect->height, scale_cam_v);
1199         }
1200 
1201         /* Cache camera output window */
1202         cam->width      = mf->width;
1203         cam->height     = mf->height;
1204 
1205         if (pcdev->image_mode) {
1206                 out_width       = min(interm_width, icd->user_width);
1207                 out_height      = min(interm_height, icd->user_height);
1208         } else {
1209                 out_width       = interm_width;
1210                 out_height      = interm_height;
1211         }
1212 
1213         /*
1214          * 5. Calculate CEU scales from camera scales from results of (5) and
1215          *    the user window
1216          */
1217         scale_ceu_h     = calc_scale(interm_width, &out_width);
1218         scale_ceu_v     = calc_scale(interm_height, &out_height);
1219 
1220         dev_geo(dev, "5: CEU scales %u:%u\n", scale_ceu_h, scale_ceu_v);
1221 
1222         /* Apply CEU scales. */
1223         cflcr = scale_ceu_h | (scale_ceu_v << 16);
1224         if (cflcr != pcdev->cflcr) {
1225                 pcdev->cflcr = cflcr;
1226                 ceu_write(pcdev, CFLCR, cflcr);
1227         }
1228 
1229         icd->user_width  = out_width & ~3;
1230         icd->user_height = out_height & ~3;
1231         /* Offsets are applied at the CEU scaling filter input */
1232         cam->ceu_left    = scale_down(rect->left - cam_rect->left, scale_cam_h) & ~1;
1233         cam->ceu_top     = scale_down(rect->top - cam_rect->top, scale_cam_v) & ~1;
1234 
1235         /* 6. Use CEU cropping to crop to the new window. */
1236         sh_mobile_ceu_set_rect(icd);
1237 
1238         cam->subrect = *rect;
1239 
1240         dev_geo(dev, "6: CEU cropped to %ux%u@%u:%u\n",
1241                 icd->user_width, icd->user_height,
1242                 cam->ceu_left, cam->ceu_top);
1243 
1244         /* Restore capture. The CE bit can be cleared by the hardware */
1245         if (pcdev->active)
1246                 capsr |= 1;
1247         capture_restore(pcdev, capsr);
1248 
1249         /* Even if only camera cropping succeeded */
1250         return ret;
1251 }
1252 
1253 static int sh_mobile_ceu_get_selection(struct soc_camera_device *icd,
1254                                        struct v4l2_selection *sel)
1255 {
1256         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1257 
1258         sel->r = cam->subrect;
1259 
1260         return 0;
1261 }
1262 
1263 /* Similar to set_crop multistage iterative algorithm */
1264 static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
1265                                  struct v4l2_format *f)
1266 {
1267         struct device *dev = icd->parent;
1268         struct soc_camera_host *ici = to_soc_camera_host(dev);
1269         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1270         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1271         struct v4l2_pix_format *pix = &f->fmt.pix;
1272         struct v4l2_mbus_framefmt mf;
1273         __u32 pixfmt = pix->pixelformat;
1274         const struct soc_camera_format_xlate *xlate;
1275         unsigned int ceu_sub_width = pcdev->max_width,
1276                 ceu_sub_height = pcdev->max_height;
1277         u16 scale_v, scale_h;
1278         int ret;
1279         bool image_mode;
1280         enum v4l2_field field;
1281 
1282         switch (pix->field) {
1283         default:
1284                 pix->field = V4L2_FIELD_NONE;
1285                 /* fall-through */
1286         case V4L2_FIELD_INTERLACED_TB:
1287         case V4L2_FIELD_INTERLACED_BT:
1288         case V4L2_FIELD_NONE:
1289                 field = pix->field;
1290                 break;
1291         case V4L2_FIELD_INTERLACED:
1292                 field = V4L2_FIELD_INTERLACED_TB;
1293                 break;
1294         }
1295 
1296         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1297         if (!xlate) {
1298                 dev_warn(dev, "Format %x not found\n", pixfmt);
1299                 return -EINVAL;
1300         }
1301 
1302         /* 1.-4. Calculate desired client output geometry */
1303         soc_camera_calc_client_output(icd, &cam->rect, &cam->subrect, pix, &mf, 12);
1304         mf.field        = pix->field;
1305         mf.colorspace   = pix->colorspace;
1306         mf.code         = xlate->code;
1307 
1308         switch (pixfmt) {
1309         case V4L2_PIX_FMT_NV12:
1310         case V4L2_PIX_FMT_NV21:
1311         case V4L2_PIX_FMT_NV16:
1312         case V4L2_PIX_FMT_NV61:
1313                 image_mode = true;
1314                 break;
1315         default:
1316                 image_mode = false;
1317         }
1318 
1319         dev_geo(dev, "S_FMT(pix=0x%x, fld 0x%x, code 0x%x, %ux%u)\n", pixfmt, mf.field, mf.code,
1320                 pix->width, pix->height);
1321 
1322         dev_geo(dev, "4: request camera output %ux%u\n", mf.width, mf.height);
1323 
1324         /* 5. - 9. */
1325         ret = soc_camera_client_scale(icd, &cam->rect, &cam->subrect,
1326                                 &mf, &ceu_sub_width, &ceu_sub_height,
1327                                 image_mode && V4L2_FIELD_NONE == field, 12);
1328 
1329         dev_geo(dev, "5-9: client scale return %d\n", ret);
1330 
1331         /* Done with the camera. Now see if we can improve the result */
1332 
1333         dev_geo(dev, "fmt %ux%u, requested %ux%u\n",
1334                 mf.width, mf.height, pix->width, pix->height);
1335         if (ret < 0)
1336                 return ret;
1337 
1338         if (mf.code != xlate->code)
1339                 return -EINVAL;
1340 
1341         /* 9. Prepare CEU crop */
1342         cam->width = mf.width;
1343         cam->height = mf.height;
1344 
1345         /* 10. Use CEU scaling to scale to the requested user window. */
1346 
1347         /* We cannot scale up */
1348         if (pix->width > ceu_sub_width)
1349                 ceu_sub_width = pix->width;
1350 
1351         if (pix->height > ceu_sub_height)
1352                 ceu_sub_height = pix->height;
1353 
1354         pix->colorspace = mf.colorspace;
1355 
1356         if (image_mode) {
1357                 /* Scale pix->{width x height} down to width x height */
1358                 scale_h         = calc_scale(ceu_sub_width, &pix->width);
1359                 scale_v         = calc_scale(ceu_sub_height, &pix->height);
1360         } else {
1361                 pix->width      = ceu_sub_width;
1362                 pix->height     = ceu_sub_height;
1363                 scale_h         = 0;
1364                 scale_v         = 0;
1365         }
1366 
1367         pcdev->cflcr = scale_h | (scale_v << 16);
1368 
1369         /*
1370          * We have calculated CFLCR, the actual configuration will be performed
1371          * in sh_mobile_ceu_set_bus_param()
1372          */
1373 
1374         dev_geo(dev, "10: W: %u : 0x%x = %u, H: %u : 0x%x = %u\n",
1375                 ceu_sub_width, scale_h, pix->width,
1376                 ceu_sub_height, scale_v, pix->height);
1377 
1378         cam->code               = xlate->code;
1379         icd->current_fmt        = xlate;
1380 
1381         pcdev->field = field;
1382         pcdev->image_mode = image_mode;
1383 
1384         /* CFSZR requirement */
1385         pix->width      &= ~3;
1386         pix->height     &= ~3;
1387 
1388         return 0;
1389 }
1390 
1391 #define CEU_CHDW_MAX    8188U   /* Maximum line stride */
1392 
1393 static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
1394                                  struct v4l2_format *f)
1395 {
1396         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1397         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1398         const struct soc_camera_format_xlate *xlate;
1399         struct v4l2_pix_format *pix = &f->fmt.pix;
1400         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1401         struct v4l2_subdev_pad_config pad_cfg;
1402         struct v4l2_subdev_format format = {
1403                 .which = V4L2_SUBDEV_FORMAT_TRY,
1404         };
1405         struct v4l2_mbus_framefmt *mf = &format.format;
1406         __u32 pixfmt = pix->pixelformat;
1407         int width, height;
1408         int ret;
1409 
1410         dev_geo(icd->parent, "TRY_FMT(pix=0x%x, %ux%u)\n",
1411                  pixfmt, pix->width, pix->height);
1412 
1413         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1414         if (!xlate) {
1415                 xlate = icd->current_fmt;
1416                 dev_dbg(icd->parent, "Format %x not found, keeping %x\n",
1417                         pixfmt, xlate->host_fmt->fourcc);
1418                 pixfmt = xlate->host_fmt->fourcc;
1419                 pix->pixelformat = pixfmt;
1420                 pix->colorspace = icd->colorspace;
1421         }
1422 
1423         /* FIXME: calculate using depth and bus width */
1424 
1425         /* CFSZR requires height and width to be 4-pixel aligned */
1426         v4l_bound_align_image(&pix->width, 2, pcdev->max_width, 2,
1427                               &pix->height, 4, pcdev->max_height, 2, 0);
1428 
1429         width = pix->width;
1430         height = pix->height;
1431 
1432         /* limit to sensor capabilities */
1433         mf->width       = pix->width;
1434         mf->height      = pix->height;
1435         mf->field       = pix->field;
1436         mf->code        = xlate->code;
1437         mf->colorspace  = pix->colorspace;
1438 
1439         ret = v4l2_device_call_until_err(sd->v4l2_dev, soc_camera_grp_id(icd),
1440                                          pad, set_fmt, &pad_cfg, &format);
1441         if (ret < 0)
1442                 return ret;
1443 
1444         pix->width      = mf->width;
1445         pix->height     = mf->height;
1446         pix->field      = mf->field;
1447         pix->colorspace = mf->colorspace;
1448 
1449         switch (pixfmt) {
1450         case V4L2_PIX_FMT_NV12:
1451         case V4L2_PIX_FMT_NV21:
1452         case V4L2_PIX_FMT_NV16:
1453         case V4L2_PIX_FMT_NV61:
1454                 /* FIXME: check against rect_max after converting soc-camera */
1455                 /* We can scale precisely, need a bigger image from camera */
1456                 if (pix->width < width || pix->height < height) {
1457                         /*
1458                          * We presume, the sensor behaves sanely, i.e., if
1459                          * requested a bigger rectangle, it will not return a
1460                          * smaller one.
1461                          */
1462                         mf->width = pcdev->max_width;
1463                         mf->height = pcdev->max_height;
1464                         ret = v4l2_device_call_until_err(sd->v4l2_dev,
1465                                         soc_camera_grp_id(icd), pad,
1466                                         set_fmt, &pad_cfg, &format);
1467                         if (ret < 0) {
1468                                 /* Shouldn't actually happen... */
1469                                 dev_err(icd->parent,
1470                                         "FIXME: client try_fmt() = %d\n", ret);
1471                                 return ret;
1472                         }
1473                 }
1474                 /* We will scale exactly */
1475                 if (mf->width > width)
1476                         pix->width = width;
1477                 if (mf->height > height)
1478                         pix->height = height;
1479 
1480                 pix->bytesperline = max(pix->bytesperline, pix->width);
1481                 pix->bytesperline = min(pix->bytesperline, CEU_CHDW_MAX);
1482                 pix->bytesperline &= ~3;
1483                 break;
1484 
1485         default:
1486                 /* Configurable stride isn't supported in pass-through mode. */
1487                 pix->bytesperline  = 0;
1488         }
1489 
1490         pix->width      &= ~3;
1491         pix->height     &= ~3;
1492         pix->sizeimage  = 0;
1493 
1494         dev_geo(icd->parent, "%s(): return %d, fmt 0x%x, %ux%u\n",
1495                 __func__, ret, pix->pixelformat, pix->width, pix->height);
1496 
1497         return ret;
1498 }
1499 
1500 static int sh_mobile_ceu_set_liveselection(struct soc_camera_device *icd,
1501                                            struct v4l2_selection *sel)
1502 {
1503         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1504         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1505         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1506         u32 out_width = icd->user_width, out_height = icd->user_height;
1507         int ret;
1508 
1509         /* Freeze queue */
1510         pcdev->frozen = 1;
1511         /* Wait for frame */
1512         ret = wait_for_completion_interruptible(&pcdev->complete);
1513         /* Stop the client */
1514         ret = v4l2_subdev_call(sd, video, s_stream, 0);
1515         if (ret < 0)
1516                 dev_warn(icd->parent,
1517                          "Client failed to stop the stream: %d\n", ret);
1518         else
1519                 /* Do the crop, if it fails, there's nothing more we can do */
1520                 sh_mobile_ceu_set_selection(icd, sel);
1521 
1522         dev_geo(icd->parent, "Output after crop: %ux%u\n", icd->user_width, icd->user_height);
1523 
1524         if (icd->user_width != out_width || icd->user_height != out_height) {
1525                 struct v4l2_format f = {
1526                         .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1527                         .fmt.pix        = {
1528                                 .width          = out_width,
1529                                 .height         = out_height,
1530                                 .pixelformat    = icd->current_fmt->host_fmt->fourcc,
1531                                 .field          = pcdev->field,
1532                                 .colorspace     = icd->colorspace,
1533                         },
1534                 };
1535                 ret = sh_mobile_ceu_set_fmt(icd, &f);
1536                 if (!ret && (out_width != f.fmt.pix.width ||
1537                              out_height != f.fmt.pix.height))
1538                         ret = -EINVAL;
1539                 if (!ret) {
1540                         icd->user_width         = out_width & ~3;
1541                         icd->user_height        = out_height & ~3;
1542                         ret = sh_mobile_ceu_set_bus_param(icd);
1543                 }
1544         }
1545 
1546         /* Thaw the queue */
1547         pcdev->frozen = 0;
1548         spin_lock_irq(&pcdev->lock);
1549         sh_mobile_ceu_capture(pcdev);
1550         spin_unlock_irq(&pcdev->lock);
1551         /* Start the client */
1552         ret = v4l2_subdev_call(sd, video, s_stream, 1);
1553         return ret;
1554 }
1555 
1556 static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
1557 {
1558         struct soc_camera_device *icd = file->private_data;
1559 
1560         return vb2_poll(&icd->vb2_vidq, file, pt);
1561 }
1562 
1563 static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
1564                                   struct v4l2_capability *cap)
1565 {
1566         strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
1567         strlcpy(cap->driver, "sh_mobile_ceu", sizeof(cap->driver));
1568         strlcpy(cap->bus_info, "platform:sh_mobile_ceu", sizeof(cap->bus_info));
1569         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1570         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1571 
1572         return 0;
1573 }
1574 
1575 static int sh_mobile_ceu_init_videobuf(struct vb2_queue *q,
1576                                        struct soc_camera_device *icd)
1577 {
1578         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1579 
1580         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1581         q->io_modes = VB2_MMAP | VB2_USERPTR;
1582         q->drv_priv = icd;
1583         q->ops = &sh_mobile_ceu_videobuf_ops;
1584         q->mem_ops = &vb2_dma_contig_memops;
1585         q->buf_struct_size = sizeof(struct sh_mobile_ceu_buffer);
1586         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1587         q->lock = &ici->host_lock;
1588         q->dev = ici->v4l2_dev.dev;
1589 
1590         return vb2_queue_init(q);
1591 }
1592 
1593 static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
1594         .owner          = THIS_MODULE,
1595         .add            = sh_mobile_ceu_add_device,
1596         .remove         = sh_mobile_ceu_remove_device,
1597         .clock_start    = sh_mobile_ceu_clock_start,
1598         .clock_stop     = sh_mobile_ceu_clock_stop,
1599         .get_formats    = sh_mobile_ceu_get_formats,
1600         .put_formats    = sh_mobile_ceu_put_formats,
1601         .get_selection  = sh_mobile_ceu_get_selection,
1602         .set_selection  = sh_mobile_ceu_set_selection,
1603         .set_liveselection      = sh_mobile_ceu_set_liveselection,
1604         .set_fmt        = sh_mobile_ceu_set_fmt,
1605         .try_fmt        = sh_mobile_ceu_try_fmt,
1606         .poll           = sh_mobile_ceu_poll,
1607         .querycap       = sh_mobile_ceu_querycap,
1608         .set_bus_param  = sh_mobile_ceu_set_bus_param,
1609         .init_videobuf2 = sh_mobile_ceu_init_videobuf,
1610 };
1611 
1612 struct bus_wait {
1613         struct notifier_block   notifier;
1614         struct completion       completion;
1615         struct device           *dev;
1616 };
1617 
1618 static int bus_notify(struct notifier_block *nb,
1619                       unsigned long action, void *data)
1620 {
1621         struct device *dev = data;
1622         struct bus_wait *wait = container_of(nb, struct bus_wait, notifier);
1623 
1624         if (wait->dev != dev)
1625                 return NOTIFY_DONE;
1626 
1627         switch (action) {
1628         case BUS_NOTIFY_UNBOUND_DRIVER:
1629                 /* Protect from module unloading */
1630                 wait_for_completion(&wait->completion);
1631                 return NOTIFY_OK;
1632         }
1633         return NOTIFY_DONE;
1634 }
1635 
1636 static int sh_mobile_ceu_probe(struct platform_device *pdev)
1637 {
1638         struct sh_mobile_ceu_dev *pcdev;
1639         struct resource *res;
1640         void __iomem *base;
1641         unsigned int irq;
1642         int err;
1643         struct bus_wait wait = {
1644                 .completion = COMPLETION_INITIALIZER_ONSTACK(wait.completion),
1645                 .notifier.notifier_call = bus_notify,
1646         };
1647 
1648         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1649         irq = platform_get_irq(pdev, 0);
1650         if (!res || (int)irq <= 0) {
1651                 dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
1652                 return -ENODEV;
1653         }
1654 
1655         pcdev = devm_kzalloc(&pdev->dev, sizeof(*pcdev), GFP_KERNEL);
1656         if (!pcdev) {
1657                 dev_err(&pdev->dev, "Could not allocate pcdev\n");
1658                 return -ENOMEM;
1659         }
1660 
1661         INIT_LIST_HEAD(&pcdev->capture);
1662         spin_lock_init(&pcdev->lock);
1663         init_completion(&pcdev->complete);
1664 
1665         pcdev->pdata = pdev->dev.platform_data;
1666         if (!pcdev->pdata && !pdev->dev.of_node) {
1667                 dev_err(&pdev->dev, "CEU platform data not set.\n");
1668                 return -EINVAL;
1669         }
1670 
1671         /* TODO: implement per-device bus flags */
1672         if (pcdev->pdata) {
1673                 pcdev->max_width = pcdev->pdata->max_width;
1674                 pcdev->max_height = pcdev->pdata->max_height;
1675                 pcdev->flags = pcdev->pdata->flags;
1676         }
1677         pcdev->field = V4L2_FIELD_NONE;
1678 
1679         if (!pcdev->max_width) {
1680                 unsigned int v;
1681                 err = of_property_read_u32(pdev->dev.of_node, "renesas,max-width", &v);
1682                 if (!err)
1683                         pcdev->max_width = v;
1684 
1685                 if (!pcdev->max_width)
1686                         pcdev->max_width = 2560;
1687         }
1688         if (!pcdev->max_height) {
1689                 unsigned int v;
1690                 err = of_property_read_u32(pdev->dev.of_node, "renesas,max-height", &v);
1691                 if (!err)
1692                         pcdev->max_height = v;
1693 
1694                 if (!pcdev->max_height)
1695                         pcdev->max_height = 1920;
1696         }
1697 
1698         base = devm_ioremap_resource(&pdev->dev, res);
1699         if (IS_ERR(base))
1700                 return PTR_ERR(base);
1701 
1702         pcdev->irq = irq;
1703         pcdev->base = base;
1704         pcdev->video_limit = 0; /* only enabled if second resource exists */
1705 
1706         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1707         if (res) {
1708                 err = dma_declare_coherent_memory(&pdev->dev, res->start,
1709                                                   res->start,
1710                                                   resource_size(res),
1711                                                   DMA_MEMORY_MAP |
1712                                                   DMA_MEMORY_EXCLUSIVE);
1713                 if (!err) {
1714                         dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
1715                         return -ENXIO;
1716                 }
1717 
1718                 pcdev->video_limit = resource_size(res);
1719         }
1720 
1721         /* request irq */
1722         err = devm_request_irq(&pdev->dev, pcdev->irq, sh_mobile_ceu_irq,
1723                                0, dev_name(&pdev->dev), pcdev);
1724         if (err) {
1725                 dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
1726                 goto exit_release_mem;
1727         }
1728 
1729         pm_suspend_ignore_children(&pdev->dev, true);
1730         pm_runtime_enable(&pdev->dev);
1731         pm_runtime_resume(&pdev->dev);
1732 
1733         pcdev->ici.priv = pcdev;
1734         pcdev->ici.v4l2_dev.dev = &pdev->dev;
1735         pcdev->ici.nr = pdev->id;
1736         pcdev->ici.drv_name = dev_name(&pdev->dev);
1737         pcdev->ici.ops = &sh_mobile_ceu_host_ops;
1738         pcdev->ici.capabilities = SOCAM_HOST_CAP_STRIDE;
1739 
1740         if (pcdev->pdata && pcdev->pdata->asd_sizes) {
1741                 pcdev->ici.asd = pcdev->pdata->asd;
1742                 pcdev->ici.asd_sizes = pcdev->pdata->asd_sizes;
1743         }
1744 
1745         err = soc_camera_host_register(&pcdev->ici);
1746         if (err)
1747                 goto exit_free_clk;
1748 
1749         return 0;
1750 
1751 exit_free_clk:
1752         pm_runtime_disable(&pdev->dev);
1753 exit_release_mem:
1754         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
1755                 dma_release_declared_memory(&pdev->dev);
1756         return err;
1757 }
1758 
1759 static int sh_mobile_ceu_remove(struct platform_device *pdev)
1760 {
1761         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
1762 
1763         soc_camera_host_unregister(soc_host);
1764         pm_runtime_disable(&pdev->dev);
1765         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
1766                 dma_release_declared_memory(&pdev->dev);
1767 
1768         return 0;
1769 }
1770 
1771 static int sh_mobile_ceu_runtime_nop(struct device *dev)
1772 {
1773         /* Runtime PM callback shared between ->runtime_suspend()
1774          * and ->runtime_resume(). Simply returns success.
1775          *
1776          * This driver re-initializes all registers after
1777          * pm_runtime_get_sync() anyway so there is no need
1778          * to save and restore registers here.
1779          */
1780         return 0;
1781 }
1782 
1783 static const struct dev_pm_ops sh_mobile_ceu_dev_pm_ops = {
1784         .runtime_suspend = sh_mobile_ceu_runtime_nop,
1785         .runtime_resume = sh_mobile_ceu_runtime_nop,
1786 };
1787 
1788 static const struct of_device_id sh_mobile_ceu_of_match[] = {
1789         { .compatible = "renesas,sh-mobile-ceu" },
1790         { }
1791 };
1792 MODULE_DEVICE_TABLE(of, sh_mobile_ceu_of_match);
1793 
1794 static struct platform_driver sh_mobile_ceu_driver = {
1795         .driver         = {
1796                 .name   = "sh_mobile_ceu",
1797                 .pm     = &sh_mobile_ceu_dev_pm_ops,
1798                 .of_match_table = sh_mobile_ceu_of_match,
1799         },
1800         .probe          = sh_mobile_ceu_probe,
1801         .remove         = sh_mobile_ceu_remove,
1802 };
1803 
1804 static int __init sh_mobile_ceu_init(void)
1805 {
1806         return platform_driver_register(&sh_mobile_ceu_driver);
1807 }
1808 
1809 static void __exit sh_mobile_ceu_exit(void)
1810 {
1811         platform_driver_unregister(&sh_mobile_ceu_driver);
1812 }
1813 
1814 module_init(sh_mobile_ceu_init);
1815 module_exit(sh_mobile_ceu_exit);
1816 
1817 MODULE_DESCRIPTION("SuperH Mobile CEU driver");
1818 MODULE_AUTHOR("Magnus Damm");
1819 MODULE_LICENSE("GPL");
1820 MODULE_VERSION("0.1.0");
1821 MODULE_ALIAS("platform:sh_mobile_ceu");
1822 

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