Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2

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/sh_mobile_ceu.h>
 44 #include <media/sh_mobile_csi2.h>
 45 #include <media/videobuf2-dma-contig.h>
 46 #include <media/v4l2-mediabus.h>
 47 #include <media/soc_mediabus.h>
 48 
 49 #include "soc_scale_crop.h"
 50 
 51 /* register offsets for sh7722 / sh7723 */
 52 
 53 #define CAPSR  0x00 /* Capture start register */
 54 #define CAPCR  0x04 /* Capture control register */
 55 #define CAMCR  0x08 /* Capture interface control register */
 56 #define CMCYR  0x0c /* Capture interface cycle  register */
 57 #define CAMOR  0x10 /* Capture interface offset register */
 58 #define CAPWR  0x14 /* Capture interface width register */
 59 #define CAIFR  0x18 /* Capture interface input format register */
 60 #define CSTCR  0x20 /* Camera strobe control register (<= sh7722) */
 61 #define CSECR  0x24 /* Camera strobe emission count register (<= sh7722) */
 62 #define CRCNTR 0x28 /* CEU register control register */
 63 #define CRCMPR 0x2c /* CEU register forcible control register */
 64 #define CFLCR  0x30 /* Capture filter control register */
 65 #define CFSZR  0x34 /* Capture filter size clip register */
 66 #define CDWDR  0x38 /* Capture destination width register */
 67 #define CDAYR  0x3c /* Capture data address Y register */
 68 #define CDACR  0x40 /* Capture data address C register */
 69 #define CDBYR  0x44 /* Capture data bottom-field address Y register */
 70 #define CDBCR  0x48 /* Capture data bottom-field address C register */
 71 #define CBDSR  0x4c /* Capture bundle destination size register */
 72 #define CFWCR  0x5c /* Firewall operation control register */
 73 #define CLFCR  0x60 /* Capture low-pass filter control register */
 74 #define CDOCR  0x64 /* Capture data output control register */
 75 #define CDDCR  0x68 /* Capture data complexity level register */
 76 #define CDDAR  0x6c /* Capture data complexity level address register */
 77 #define CEIER  0x70 /* Capture event interrupt enable register */
 78 #define CETCR  0x74 /* Capture event flag clear register */
 79 #define CSTSR  0x7c /* Capture status register */
 80 #define CSRTR  0x80 /* Capture software reset register */
 81 #define CDSSR  0x84 /* Capture data size register */
 82 #define CDAYR2 0x90 /* Capture data address Y register 2 */
 83 #define CDACR2 0x94 /* Capture data address C register 2 */
 84 #define CDBYR2 0x98 /* Capture data bottom-field address Y register 2 */
 85 #define CDBCR2 0x9c /* Capture data bottom-field address C register 2 */
 86 
 87 #undef DEBUG_GEOMETRY
 88 #ifdef DEBUG_GEOMETRY
 89 #define dev_geo dev_info
 90 #else
 91 #define dev_geo dev_dbg
 92 #endif
 93 
 94 /* per video frame buffer */
 95 struct sh_mobile_ceu_buffer {
 96         struct vb2_buffer vb; /* v4l buffer must be first */
 97         struct list_head queue;
 98 };
 99 
100 struct sh_mobile_ceu_dev {
101         struct soc_camera_host ici;
102         /* Asynchronous CSI2 linking */
103         struct v4l2_async_subdev *csi2_asd;
104         struct v4l2_subdev *csi2_sd;
105         /* Synchronous probing compatibility */
106         struct platform_device *csi2_pdev;
107 
108         unsigned int irq;
109         void __iomem *base;
110         size_t video_limit;
111         size_t buf_total;
112 
113         spinlock_t lock;                /* Protects video buffer lists */
114         struct list_head capture;
115         struct vb2_buffer *active;
116         struct vb2_alloc_ctx *alloc_ctx;
117 
118         struct sh_mobile_ceu_info *pdata;
119         struct completion complete;
120 
121         u32 cflcr;
122 
123         /* static max sizes either from platform data or default */
124         int max_width;
125         int max_height;
126 
127         enum v4l2_field field;
128         int sequence;
129         unsigned long flags;
130 
131         unsigned int image_mode:1;
132         unsigned int is_16bit:1;
133         unsigned int frozen:1;
134 };
135 
136 struct sh_mobile_ceu_cam {
137         /* CEU offsets within the camera output, before the CEU scaler */
138         unsigned int ceu_left;
139         unsigned int ceu_top;
140         /* Client output, as seen by the CEU */
141         unsigned int width;
142         unsigned int height;
143         /*
144          * User window from S_CROP / G_CROP, produced by client cropping and
145          * scaling, CEU scaling and CEU cropping, mapped back onto the client
146          * input window
147          */
148         struct v4l2_rect subrect;
149         /* Camera cropping rectangle */
150         struct v4l2_rect rect;
151         const struct soc_mbus_pixelfmt *extra_fmt;
152         u32 code;
153 };
154 
155 static struct sh_mobile_ceu_buffer *to_ceu_vb(struct vb2_buffer *vb)
156 {
157         return container_of(vb, struct sh_mobile_ceu_buffer, vb);
158 }
159 
160 static void ceu_write(struct sh_mobile_ceu_dev *priv,
161                       unsigned long reg_offs, u32 data)
162 {
163         iowrite32(data, priv->base + reg_offs);
164 }
165 
166 static u32 ceu_read(struct sh_mobile_ceu_dev *priv, unsigned long reg_offs)
167 {
168         return ioread32(priv->base + reg_offs);
169 }
170 
171 static int sh_mobile_ceu_soft_reset(struct sh_mobile_ceu_dev *pcdev)
172 {
173         int i, success = 0;
174 
175         ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
176 
177         /* wait CSTSR.CPTON bit */
178         for (i = 0; i < 1000; i++) {
179                 if (!(ceu_read(pcdev, CSTSR) & 1)) {
180                         success++;
181                         break;
182                 }
183                 udelay(1);
184         }
185 
186         /* wait CAPSR.CPKIL bit */
187         for (i = 0; i < 1000; i++) {
188                 if (!(ceu_read(pcdev, CAPSR) & (1 << 16))) {
189                         success++;
190                         break;
191                 }
192                 udelay(1);
193         }
194 
195         if (2 != success) {
196                 dev_warn(pcdev->ici.v4l2_dev.dev, "soft reset time out\n");
197                 return -EIO;
198         }
199 
200         return 0;
201 }
202 
203 /*
204  *  Videobuf operations
205  */
206 
207 /*
208  * .queue_setup() is called to check, whether the driver can accept the
209  *                requested number of buffers and to fill in plane sizes
210  *                for the current frame format if required
211  */
212 static int sh_mobile_ceu_videobuf_setup(struct vb2_queue *vq,
213                         const struct v4l2_format *fmt,
214                         unsigned int *count, unsigned int *num_planes,
215                         unsigned int sizes[], void *alloc_ctxs[])
216 {
217         struct soc_camera_device *icd = container_of(vq, struct soc_camera_device, vb2_vidq);
218         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
219         struct sh_mobile_ceu_dev *pcdev = ici->priv;
220 
221         if (fmt) {
222                 const struct soc_camera_format_xlate *xlate = soc_camera_xlate_by_fourcc(icd,
223                                                                 fmt->fmt.pix.pixelformat);
224                 unsigned int bytes_per_line;
225                 int ret;
226 
227                 if (!xlate)
228                         return -EINVAL;
229 
230                 ret = soc_mbus_bytes_per_line(fmt->fmt.pix.width,
231                                               xlate->host_fmt);
232                 if (ret < 0)
233                         return ret;
234 
235                 bytes_per_line = max_t(u32, fmt->fmt.pix.bytesperline, ret);
236 
237                 ret = soc_mbus_image_size(xlate->host_fmt, bytes_per_line,
238                                           fmt->fmt.pix.height);
239                 if (ret < 0)
240                         return ret;
241 
242                 sizes[0] = max_t(u32, fmt->fmt.pix.sizeimage, ret);
243         } else {
244                 /* Called from VIDIOC_REQBUFS or in compatibility mode */
245                 sizes[0] = icd->sizeimage;
246         }
247 
248         alloc_ctxs[0] = pcdev->alloc_ctx;
249 
250         if (!vq->num_buffers)
251                 pcdev->sequence = 0;
252 
253         if (!*count)
254                 *count = 2;
255 
256         /* If *num_planes != 0, we have already verified *count. */
257         if (pcdev->video_limit && !*num_planes) {
258                 size_t size = PAGE_ALIGN(sizes[0]) * *count;
259 
260                 if (size + pcdev->buf_total > pcdev->video_limit)
261                         *count = (pcdev->video_limit - pcdev->buf_total) /
262                                 PAGE_ALIGN(sizes[0]);
263         }
264 
265         *num_planes = 1;
266 
267         dev_dbg(icd->parent, "count=%d, size=%u\n", *count, sizes[0]);
268 
269         return 0;
270 }
271 
272 #define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */
273 #define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */
274 #define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */
275 #define CEU_CEIER_VBP   (1 << 20) /* vbp error */
276 #define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */
277 #define CEU_CEIER_MASK (CEU_CEIER_CPEIE | CEU_CEIER_VBP)
278 
279 
280 /*
281  * return value doesn't reflex the success/failure to queue the new buffer,
282  * but rather the status of the previous buffer.
283  */
284 static int sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
285 {
286         struct soc_camera_device *icd = pcdev->ici.icd;
287         dma_addr_t phys_addr_top, phys_addr_bottom;
288         unsigned long top1, top2;
289         unsigned long bottom1, bottom2;
290         u32 status;
291         bool planar;
292         int ret = 0;
293 
294         /*
295          * The hardware is _very_ picky about this sequence. Especially
296          * the CEU_CETCR_MAGIC value. It seems like we need to acknowledge
297          * several not-so-well documented interrupt sources in CETCR.
298          */
299         ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_MASK);
300         status = ceu_read(pcdev, CETCR);
301         ceu_write(pcdev, CETCR, ~status & CEU_CETCR_MAGIC);
302         if (!pcdev->frozen)
303                 ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_MASK);
304         ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP);
305         ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW);
306 
307         /*
308          * When a VBP interrupt occurs, a capture end interrupt does not occur
309          * and the image of that frame is not captured correctly. So, soft reset
310          * is needed here.
311          */
312         if (status & CEU_CEIER_VBP) {
313                 sh_mobile_ceu_soft_reset(pcdev);
314                 ret = -EIO;
315         }
316 
317         if (pcdev->frozen) {
318                 complete(&pcdev->complete);
319                 return ret;
320         }
321 
322         if (!pcdev->active)
323                 return ret;
324 
325         if (V4L2_FIELD_INTERLACED_BT == pcdev->field) {
326                 top1    = CDBYR;
327                 top2    = CDBCR;
328                 bottom1 = CDAYR;
329                 bottom2 = CDACR;
330         } else {
331                 top1    = CDAYR;
332                 top2    = CDACR;
333                 bottom1 = CDBYR;
334                 bottom2 = CDBCR;
335         }
336 
337         phys_addr_top = vb2_dma_contig_plane_dma_addr(pcdev->active, 0);
338 
339         switch (icd->current_fmt->host_fmt->fourcc) {
340         case V4L2_PIX_FMT_NV12:
341         case V4L2_PIX_FMT_NV21:
342         case V4L2_PIX_FMT_NV16:
343         case V4L2_PIX_FMT_NV61:
344                 planar = true;
345                 break;
346         default:
347                 planar = false;
348         }
349 
350         ceu_write(pcdev, top1, phys_addr_top);
351         if (V4L2_FIELD_NONE != pcdev->field) {
352                 phys_addr_bottom = phys_addr_top + icd->bytesperline;
353                 ceu_write(pcdev, bottom1, phys_addr_bottom);
354         }
355 
356         if (planar) {
357                 phys_addr_top += icd->bytesperline * icd->user_height;
358                 ceu_write(pcdev, top2, phys_addr_top);
359                 if (V4L2_FIELD_NONE != pcdev->field) {
360                         phys_addr_bottom = phys_addr_top + icd->bytesperline;
361                         ceu_write(pcdev, bottom2, phys_addr_bottom);
362                 }
363         }
364 
365         ceu_write(pcdev, CAPSR, 0x1); /* start capture */
366 
367         return ret;
368 }
369 
370 static int sh_mobile_ceu_videobuf_prepare(struct vb2_buffer *vb)
371 {
372         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb);
373 
374         /* Added list head initialization on alloc */
375         WARN(!list_empty(&buf->queue), "Buffer %p on queue!\n", vb);
376 
377         return 0;
378 }
379 
380 static void sh_mobile_ceu_videobuf_queue(struct vb2_buffer *vb)
381 {
382         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
383         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
384         struct sh_mobile_ceu_dev *pcdev = ici->priv;
385         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb);
386         unsigned long size;
387 
388         size = icd->sizeimage;
389 
390         if (vb2_plane_size(vb, 0) < size) {
391                 dev_err(icd->parent, "Buffer #%d too small (%lu < %lu)\n",
392                         vb->v4l2_buf.index, vb2_plane_size(vb, 0), size);
393                 goto error;
394         }
395 
396         vb2_set_plane_payload(vb, 0, size);
397 
398         dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
399                 vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
400 
401 #ifdef DEBUG
402         /*
403          * This can be useful if you want to see if we actually fill
404          * the buffer with something
405          */
406         if (vb2_plane_vaddr(vb, 0))
407                 memset(vb2_plane_vaddr(vb, 0), 0xaa, vb2_get_plane_payload(vb, 0));
408 #endif
409 
410         spin_lock_irq(&pcdev->lock);
411         list_add_tail(&buf->queue, &pcdev->capture);
412 
413         if (!pcdev->active) {
414                 /*
415                  * Because there were no active buffer at this moment,
416                  * we are not interested in the return value of
417                  * sh_mobile_ceu_capture here.
418                  */
419                 pcdev->active = vb;
420                 sh_mobile_ceu_capture(pcdev);
421         }
422         spin_unlock_irq(&pcdev->lock);
423 
424         return;
425 
426 error:
427         vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
428 }
429 
430 static void sh_mobile_ceu_videobuf_release(struct vb2_buffer *vb)
431 {
432         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
433         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
434         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb);
435         struct sh_mobile_ceu_dev *pcdev = ici->priv;
436 
437         spin_lock_irq(&pcdev->lock);
438 
439         if (pcdev->active == vb) {
440                 /* disable capture (release DMA buffer), reset */
441                 ceu_write(pcdev, CAPSR, 1 << 16);
442                 pcdev->active = NULL;
443         }
444 
445         /*
446          * Doesn't hurt also if the list is empty, but it hurts, if queuing the
447          * buffer failed, and .buf_init() hasn't been called
448          */
449         if (buf->queue.next)
450                 list_del_init(&buf->queue);
451 
452         pcdev->buf_total -= PAGE_ALIGN(vb2_plane_size(vb, 0));
453         dev_dbg(icd->parent, "%s() %zu bytes buffers\n", __func__,
454                 pcdev->buf_total);
455 
456         spin_unlock_irq(&pcdev->lock);
457 }
458 
459 static int sh_mobile_ceu_videobuf_init(struct vb2_buffer *vb)
460 {
461         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
462         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
463         struct sh_mobile_ceu_dev *pcdev = ici->priv;
464 
465         pcdev->buf_total += PAGE_ALIGN(vb2_plane_size(vb, 0));
466         dev_dbg(icd->parent, "%s() %zu bytes buffers\n", __func__,
467                 pcdev->buf_total);
468 
469         /* This is for locking debugging only */
470         INIT_LIST_HEAD(&to_ceu_vb(vb)->queue);
471         return 0;
472 }
473 
474 static void sh_mobile_ceu_stop_streaming(struct vb2_queue *q)
475 {
476         struct soc_camera_device *icd = container_of(q, struct soc_camera_device, vb2_vidq);
477         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
478         struct sh_mobile_ceu_dev *pcdev = ici->priv;
479         struct list_head *buf_head, *tmp;
480 
481         spin_lock_irq(&pcdev->lock);
482 
483         pcdev->active = NULL;
484 
485         list_for_each_safe(buf_head, tmp, &pcdev->capture)
486                 list_del_init(buf_head);
487 
488         spin_unlock_irq(&pcdev->lock);
489 
490         sh_mobile_ceu_soft_reset(pcdev);
491 }
492 
493 static struct vb2_ops sh_mobile_ceu_videobuf_ops = {
494         .queue_setup    = sh_mobile_ceu_videobuf_setup,
495         .buf_prepare    = sh_mobile_ceu_videobuf_prepare,
496         .buf_queue      = sh_mobile_ceu_videobuf_queue,
497         .buf_cleanup    = sh_mobile_ceu_videobuf_release,
498         .buf_init       = sh_mobile_ceu_videobuf_init,
499         .wait_prepare   = vb2_ops_wait_prepare,
500         .wait_finish    = vb2_ops_wait_finish,
501         .stop_streaming = sh_mobile_ceu_stop_streaming,
502 };
503 
504 static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
505 {
506         struct sh_mobile_ceu_dev *pcdev = data;
507         struct vb2_buffer *vb;
508         int ret;
509 
510         spin_lock(&pcdev->lock);
511 
512         vb = pcdev->active;
513         if (!vb)
514                 /* Stale interrupt from a released buffer */
515                 goto out;
516 
517         list_del_init(&to_ceu_vb(vb)->queue);
518 
519         if (!list_empty(&pcdev->capture))
520                 pcdev->active = &list_entry(pcdev->capture.next,
521                                             struct sh_mobile_ceu_buffer, queue)->vb;
522         else
523                 pcdev->active = NULL;
524 
525         ret = sh_mobile_ceu_capture(pcdev);
526         v4l2_get_timestamp(&vb->v4l2_buf.timestamp);
527         if (!ret) {
528                 vb->v4l2_buf.field = pcdev->field;
529                 vb->v4l2_buf.sequence = pcdev->sequence++;
530         }
531         vb2_buffer_done(vb, ret < 0 ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
532 
533 out:
534         spin_unlock(&pcdev->lock);
535 
536         return IRQ_HANDLED;
537 }
538 
539 static struct v4l2_subdev *find_csi2(struct sh_mobile_ceu_dev *pcdev)
540 {
541         struct v4l2_subdev *sd;
542 
543         if (pcdev->csi2_sd)
544                 return pcdev->csi2_sd;
545 
546         if (pcdev->csi2_asd) {
547                 char name[] = "sh-mobile-csi2";
548                 v4l2_device_for_each_subdev(sd, &pcdev->ici.v4l2_dev)
549                         if (!strncmp(name, sd->name, sizeof(name) - 1)) {
550                                 pcdev->csi2_sd = sd;
551                                 return sd;
552                         }
553         }
554 
555         return NULL;
556 }
557 
558 static struct v4l2_subdev *csi2_subdev(struct sh_mobile_ceu_dev *pcdev,
559                                        struct soc_camera_device *icd)
560 {
561         struct v4l2_subdev *sd = pcdev->csi2_sd;
562 
563         return sd && sd->grp_id == soc_camera_grp_id(icd) ? sd : NULL;
564 }
565 
566 static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
567 {
568         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
569         struct sh_mobile_ceu_dev *pcdev = ici->priv;
570         struct v4l2_subdev *csi2_sd = find_csi2(pcdev);
571         int ret;
572 
573         if (csi2_sd) {
574                 csi2_sd->grp_id = soc_camera_grp_id(icd);
575                 v4l2_set_subdev_hostdata(csi2_sd, icd);
576         }
577 
578         ret = v4l2_subdev_call(csi2_sd, core, s_power, 1);
579         if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
580                 return ret;
581 
582         /*
583          * -ENODEV is special: either csi2_sd == NULL or the CSI-2 driver
584          * has not found this soc-camera device among its clients
585          */
586         if (csi2_sd && ret == -ENODEV)
587                 csi2_sd->grp_id = 0;
588 
589         dev_info(icd->parent,
590                  "SuperH Mobile CEU%s driver attached to camera %d\n",
591                  csi2_sd && csi2_sd->grp_id ? "/CSI-2" : "", icd->devnum);
592 
593         return 0;
594 }
595 
596 static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
597 {
598         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
599         struct sh_mobile_ceu_dev *pcdev = ici->priv;
600         struct v4l2_subdev *csi2_sd = find_csi2(pcdev);
601 
602         dev_info(icd->parent,
603                  "SuperH Mobile CEU driver detached from camera %d\n",
604                  icd->devnum);
605 
606         v4l2_subdev_call(csi2_sd, core, s_power, 0);
607 }
608 
609 /* Called with .host_lock held */
610 static int sh_mobile_ceu_clock_start(struct soc_camera_host *ici)
611 {
612         struct sh_mobile_ceu_dev *pcdev = ici->priv;
613 
614         pm_runtime_get_sync(ici->v4l2_dev.dev);
615 
616         pcdev->buf_total = 0;
617 
618         sh_mobile_ceu_soft_reset(pcdev);
619 
620         return 0;
621 }
622 
623 /* Called with .host_lock held */
624 static void sh_mobile_ceu_clock_stop(struct soc_camera_host *ici)
625 {
626         struct sh_mobile_ceu_dev *pcdev = ici->priv;
627 
628         /* disable capture, disable interrupts */
629         ceu_write(pcdev, CEIER, 0);
630         sh_mobile_ceu_soft_reset(pcdev);
631 
632         /* make sure active buffer is canceled */
633         spin_lock_irq(&pcdev->lock);
634         if (pcdev->active) {
635                 list_del_init(&to_ceu_vb(pcdev->active)->queue);
636                 vb2_buffer_done(pcdev->active, VB2_BUF_STATE_ERROR);
637                 pcdev->active = NULL;
638         }
639         spin_unlock_irq(&pcdev->lock);
640 
641         pm_runtime_put(ici->v4l2_dev.dev);
642 }
643 
644 /*
645  * See chapter 29.4.12 "Capture Filter Control Register (CFLCR)"
646  * in SH7722 Hardware Manual
647  */
648 static unsigned int size_dst(unsigned int src, unsigned int scale)
649 {
650         unsigned int mant_pre = scale >> 12;
651         if (!src || !scale)
652                 return src;
653         return ((mant_pre + 2 * (src - 1)) / (2 * mant_pre) - 1) *
654                 mant_pre * 4096 / scale + 1;
655 }
656 
657 static u16 calc_scale(unsigned int src, unsigned int *dst)
658 {
659         u16 scale;
660 
661         if (src == *dst)
662                 return 0;
663 
664         scale = (src * 4096 / *dst) & ~7;
665 
666         while (scale > 4096 && size_dst(src, scale) < *dst)
667                 scale -= 8;
668 
669         *dst = size_dst(src, scale);
670 
671         return scale;
672 }
673 
674 /* rect is guaranteed to not exceed the scaled camera rectangle */
675 static void sh_mobile_ceu_set_rect(struct soc_camera_device *icd)
676 {
677         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
678         struct sh_mobile_ceu_cam *cam = icd->host_priv;
679         struct sh_mobile_ceu_dev *pcdev = ici->priv;
680         unsigned int height, width, cdwdr_width, in_width, in_height;
681         unsigned int left_offset, top_offset;
682         u32 camor;
683 
684         dev_geo(icd->parent, "Crop %ux%u@%u:%u\n",
685                 icd->user_width, icd->user_height, cam->ceu_left, cam->ceu_top);
686 
687         left_offset     = cam->ceu_left;
688         top_offset      = cam->ceu_top;
689 
690         WARN_ON(icd->user_width & 3 || icd->user_height & 3);
691 
692         width = icd->user_width;
693 
694         if (pcdev->image_mode) {
695                 in_width = cam->width;
696                 if (!pcdev->is_16bit) {
697                         in_width *= 2;
698                         left_offset *= 2;
699                 }
700         } else {
701                 unsigned int w_factor;
702 
703                 switch (icd->current_fmt->host_fmt->packing) {
704                 case SOC_MBUS_PACKING_2X8_PADHI:
705                         w_factor = 2;
706                         break;
707                 default:
708                         w_factor = 1;
709                 }
710 
711                 in_width = cam->width * w_factor;
712                 left_offset *= w_factor;
713         }
714 
715         cdwdr_width = icd->bytesperline;
716 
717         height = icd->user_height;
718         in_height = cam->height;
719         if (V4L2_FIELD_NONE != pcdev->field) {
720                 height = (height / 2) & ~3;
721                 in_height /= 2;
722                 top_offset /= 2;
723                 cdwdr_width *= 2;
724         }
725 
726         /* CSI2 special configuration */
727         if (csi2_subdev(pcdev, icd)) {
728                 in_width = ((in_width - 2) * 2);
729                 left_offset *= 2;
730         }
731 
732         /* Set CAMOR, CAPWR, CFSZR, take care of CDWDR */
733         camor = left_offset | (top_offset << 16);
734 
735         dev_geo(icd->parent,
736                 "CAMOR 0x%x, CAPWR 0x%x, CFSZR 0x%x, CDWDR 0x%x\n", camor,
737                 (in_height << 16) | in_width, (height << 16) | width,
738                 cdwdr_width);
739 
740         ceu_write(pcdev, CAMOR, camor);
741         ceu_write(pcdev, CAPWR, (in_height << 16) | in_width);
742         /* CFSZR clipping is applied _after_ the scaling filter (CFLCR) */
743         ceu_write(pcdev, CFSZR, (height << 16) | width);
744         ceu_write(pcdev, CDWDR, cdwdr_width);
745 }
746 
747 static u32 capture_save_reset(struct sh_mobile_ceu_dev *pcdev)
748 {
749         u32 capsr = ceu_read(pcdev, CAPSR);
750         ceu_write(pcdev, CAPSR, 1 << 16); /* reset, stop capture */
751         return capsr;
752 }
753 
754 static void capture_restore(struct sh_mobile_ceu_dev *pcdev, u32 capsr)
755 {
756         unsigned long timeout = jiffies + 10 * HZ;
757 
758         /*
759          * Wait until the end of the current frame. It can take a long time,
760          * but if it has been aborted by a CAPSR reset, it shoule exit sooner.
761          */
762         while ((ceu_read(pcdev, CSTSR) & 1) && time_before(jiffies, timeout))
763                 msleep(1);
764 
765         if (time_after(jiffies, timeout)) {
766                 dev_err(pcdev->ici.v4l2_dev.dev,
767                         "Timeout waiting for frame end! Interface problem?\n");
768                 return;
769         }
770 
771         /* Wait until reset clears, this shall not hang... */
772         while (ceu_read(pcdev, CAPSR) & (1 << 16))
773                 udelay(10);
774 
775         /* Anything to restore? */
776         if (capsr & ~(1 << 16))
777                 ceu_write(pcdev, CAPSR, capsr);
778 }
779 
780 /* Find the bus subdevice driver, e.g., CSI2 */
781 static struct v4l2_subdev *find_bus_subdev(struct sh_mobile_ceu_dev *pcdev,
782                                            struct soc_camera_device *icd)
783 {
784         return csi2_subdev(pcdev, icd) ? : soc_camera_to_subdev(icd);
785 }
786 
787 #define CEU_BUS_FLAGS (V4L2_MBUS_MASTER |       \
788                 V4L2_MBUS_PCLK_SAMPLE_RISING |  \
789                 V4L2_MBUS_HSYNC_ACTIVE_HIGH |   \
790                 V4L2_MBUS_HSYNC_ACTIVE_LOW |    \
791                 V4L2_MBUS_VSYNC_ACTIVE_HIGH |   \
792                 V4L2_MBUS_VSYNC_ACTIVE_LOW |    \
793                 V4L2_MBUS_DATA_ACTIVE_HIGH)
794 
795 /* Capture is not running, no interrupts, no locking needed */
796 static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd)
797 {
798         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
799         struct sh_mobile_ceu_dev *pcdev = ici->priv;
800         struct v4l2_subdev *sd = find_bus_subdev(pcdev, icd);
801         struct sh_mobile_ceu_cam *cam = icd->host_priv;
802         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
803         unsigned long value, common_flags = CEU_BUS_FLAGS;
804         u32 capsr = capture_save_reset(pcdev);
805         unsigned int yuv_lineskip;
806         int ret;
807 
808         /*
809          * If the client doesn't implement g_mbus_config, we just use our
810          * platform data
811          */
812         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
813         if (!ret) {
814                 common_flags = soc_mbus_config_compatible(&cfg,
815                                                           common_flags);
816                 if (!common_flags)
817                         return -EINVAL;
818         } else if (ret != -ENOIOCTLCMD) {
819                 return ret;
820         }
821 
822         /* Make choises, based on platform preferences */
823         if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
824             (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
825                 if (pcdev->flags & SH_CEU_FLAG_HSYNC_LOW)
826                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
827                 else
828                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
829         }
830 
831         if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
832             (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
833                 if (pcdev->flags & SH_CEU_FLAG_VSYNC_LOW)
834                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
835                 else
836                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
837         }
838 
839         cfg.flags = common_flags;
840         ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
841         if (ret < 0 && ret != -ENOIOCTLCMD)
842                 return ret;
843 
844         if (icd->current_fmt->host_fmt->bits_per_sample > 8)
845                 pcdev->is_16bit = 1;
846         else
847                 pcdev->is_16bit = 0;
848 
849         ceu_write(pcdev, CRCNTR, 0);
850         ceu_write(pcdev, CRCMPR, 0);
851 
852         value = 0x00000010; /* data fetch by default */
853         yuv_lineskip = 0x10;
854 
855         switch (icd->current_fmt->host_fmt->fourcc) {
856         case V4L2_PIX_FMT_NV12:
857         case V4L2_PIX_FMT_NV21:
858                 /* convert 4:2:2 -> 4:2:0 */
859                 yuv_lineskip = 0; /* skip for NV12/21, no skip for NV16/61 */
860                 /* fall-through */
861         case V4L2_PIX_FMT_NV16:
862         case V4L2_PIX_FMT_NV61:
863                 switch (cam->code) {
864                 case MEDIA_BUS_FMT_UYVY8_2X8:
865                         value = 0x00000000; /* Cb0, Y0, Cr0, Y1 */
866                         break;
867                 case MEDIA_BUS_FMT_VYUY8_2X8:
868                         value = 0x00000100; /* Cr0, Y0, Cb0, Y1 */
869                         break;
870                 case MEDIA_BUS_FMT_YUYV8_2X8:
871                         value = 0x00000200; /* Y0, Cb0, Y1, Cr0 */
872                         break;
873                 case MEDIA_BUS_FMT_YVYU8_2X8:
874                         value = 0x00000300; /* Y0, Cr0, Y1, Cb0 */
875                         break;
876                 default:
877                         BUG();
878                 }
879         }
880 
881         if (icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV21 ||
882             icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV61)
883                 value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */
884 
885         value |= common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
886         value |= common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
887 
888         if (csi2_subdev(pcdev, icd)) /* CSI2 mode */
889                 value |= 3 << 12;
890         else if (pcdev->is_16bit)
891                 value |= 1 << 12;
892         else if (pcdev->flags & SH_CEU_FLAG_LOWER_8BIT)
893                 value |= 2 << 12;
894 
895         ceu_write(pcdev, CAMCR, value);
896 
897         ceu_write(pcdev, CAPCR, 0x00300000);
898 
899         switch (pcdev->field) {
900         case V4L2_FIELD_INTERLACED_TB:
901                 value = 0x101;
902                 break;
903         case V4L2_FIELD_INTERLACED_BT:
904                 value = 0x102;
905                 break;
906         default:
907                 value = 0;
908                 break;
909         }
910         ceu_write(pcdev, CAIFR, value);
911 
912         sh_mobile_ceu_set_rect(icd);
913         mdelay(1);
914 
915         dev_geo(icd->parent, "CFLCR 0x%x\n", pcdev->cflcr);
916         ceu_write(pcdev, CFLCR, pcdev->cflcr);
917 
918         /*
919          * A few words about byte order (observed in Big Endian mode)
920          *
921          * In data fetch mode bytes are received in chunks of 8 bytes.
922          * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
923          *
924          * The data is however by default written to memory in reverse order:
925          * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
926          *
927          * The lowest three bits of CDOCR allows us to do swapping,
928          * using 7 we swap the data bytes to match the incoming order:
929          * D0, D1, D2, D3, D4, D5, D6, D7
930          */
931         value = 0x00000007 | yuv_lineskip;
932 
933         ceu_write(pcdev, CDOCR, value);
934         ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
935 
936         capture_restore(pcdev, capsr);
937 
938         /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
939         return 0;
940 }
941 
942 static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd,
943                                        unsigned char buswidth)
944 {
945         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
946         struct sh_mobile_ceu_dev *pcdev = ici->priv;
947         struct v4l2_subdev *sd = find_bus_subdev(pcdev, icd);
948         unsigned long common_flags = CEU_BUS_FLAGS;
949         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
950         int ret;
951 
952         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
953         if (!ret)
954                 common_flags = soc_mbus_config_compatible(&cfg,
955                                                           common_flags);
956         else if (ret != -ENOIOCTLCMD)
957                 return ret;
958 
959         if (!common_flags || buswidth > 16)
960                 return -EINVAL;
961 
962         return 0;
963 }
964 
965 static const struct soc_mbus_pixelfmt sh_mobile_ceu_formats[] = {
966         {
967                 .fourcc                 = V4L2_PIX_FMT_NV12,
968                 .name                   = "NV12",
969                 .bits_per_sample        = 8,
970                 .packing                = SOC_MBUS_PACKING_1_5X8,
971                 .order                  = SOC_MBUS_ORDER_LE,
972                 .layout                 = SOC_MBUS_LAYOUT_PLANAR_2Y_C,
973         }, {
974                 .fourcc                 = V4L2_PIX_FMT_NV21,
975                 .name                   = "NV21",
976                 .bits_per_sample        = 8,
977                 .packing                = SOC_MBUS_PACKING_1_5X8,
978                 .order                  = SOC_MBUS_ORDER_LE,
979                 .layout                 = SOC_MBUS_LAYOUT_PLANAR_2Y_C,
980         }, {
981                 .fourcc                 = V4L2_PIX_FMT_NV16,
982                 .name                   = "NV16",
983                 .bits_per_sample        = 8,
984                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
985                 .order                  = SOC_MBUS_ORDER_LE,
986                 .layout                 = SOC_MBUS_LAYOUT_PLANAR_Y_C,
987         }, {
988                 .fourcc                 = V4L2_PIX_FMT_NV61,
989                 .name                   = "NV61",
990                 .bits_per_sample        = 8,
991                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
992                 .order                  = SOC_MBUS_ORDER_LE,
993                 .layout                 = SOC_MBUS_LAYOUT_PLANAR_Y_C,
994         },
995 };
996 
997 /* This will be corrected as we get more formats */
998 static bool sh_mobile_ceu_packing_supported(const struct soc_mbus_pixelfmt *fmt)
999 {
1000         return  fmt->packing == SOC_MBUS_PACKING_NONE ||
1001                 (fmt->bits_per_sample == 8 &&
1002                  fmt->packing == SOC_MBUS_PACKING_1_5X8) ||
1003                 (fmt->bits_per_sample == 8 &&
1004                  fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
1005                 (fmt->bits_per_sample > 8 &&
1006                  fmt->packing == SOC_MBUS_PACKING_EXTEND16);
1007 }
1008 
1009 static struct soc_camera_device *ctrl_to_icd(struct v4l2_ctrl *ctrl)
1010 {
1011         return container_of(ctrl->handler, struct soc_camera_device,
1012                                                         ctrl_handler);
1013 }
1014 
1015 static int sh_mobile_ceu_s_ctrl(struct v4l2_ctrl *ctrl)
1016 {
1017         struct soc_camera_device *icd = ctrl_to_icd(ctrl);
1018         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1019         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1020 
1021         switch (ctrl->id) {
1022         case V4L2_CID_SHARPNESS:
1023                 switch (icd->current_fmt->host_fmt->fourcc) {
1024                 case V4L2_PIX_FMT_NV12:
1025                 case V4L2_PIX_FMT_NV21:
1026                 case V4L2_PIX_FMT_NV16:
1027                 case V4L2_PIX_FMT_NV61:
1028                         ceu_write(pcdev, CLFCR, !ctrl->val);
1029                         return 0;
1030                 }
1031                 break;
1032         }
1033 
1034         return -EINVAL;
1035 }
1036 
1037 static const struct v4l2_ctrl_ops sh_mobile_ceu_ctrl_ops = {
1038         .s_ctrl = sh_mobile_ceu_s_ctrl,
1039 };
1040 
1041 static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, unsigned int idx,
1042                                      struct soc_camera_format_xlate *xlate)
1043 {
1044         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1045         struct device *dev = icd->parent;
1046         struct soc_camera_host *ici = to_soc_camera_host(dev);
1047         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1048         int ret, k, n;
1049         int formats = 0;
1050         struct sh_mobile_ceu_cam *cam;
1051         struct v4l2_subdev_mbus_code_enum code = {
1052                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1053                 .index = idx,
1054         };
1055         const struct soc_mbus_pixelfmt *fmt;
1056 
1057         ret = v4l2_subdev_call(sd, pad, enum_mbus_code, NULL, &code);
1058         if (ret < 0)
1059                 /* No more formats */
1060                 return 0;
1061 
1062         fmt = soc_mbus_get_fmtdesc(code.code);
1063         if (!fmt) {
1064                 dev_warn(dev, "unsupported format code #%u: %d\n", idx, code.code);
1065                 return 0;
1066         }
1067 
1068         if (!csi2_subdev(pcdev, icd)) {
1069                 /* Are there any restrictions in the CSI-2 case? */
1070                 ret = sh_mobile_ceu_try_bus_param(icd, fmt->bits_per_sample);
1071                 if (ret < 0)
1072                         return 0;
1073         }
1074 
1075         if (!icd->host_priv) {
1076                 struct v4l2_subdev_format fmt = {
1077                         .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1078                 };
1079                 struct v4l2_mbus_framefmt *mf = &fmt.format;
1080                 struct v4l2_rect rect;
1081                 int shift = 0;
1082 
1083                 /* Add our control */
1084                 v4l2_ctrl_new_std(&icd->ctrl_handler, &sh_mobile_ceu_ctrl_ops,
1085                                   V4L2_CID_SHARPNESS, 0, 1, 1, 1);
1086                 if (icd->ctrl_handler.error)
1087                         return icd->ctrl_handler.error;
1088 
1089                 /* FIXME: subwindow is lost between close / open */
1090 
1091                 /* Cache current client geometry */
1092                 ret = soc_camera_client_g_rect(sd, &rect);
1093                 if (ret < 0)
1094                         return ret;
1095 
1096                 /* First time */
1097                 ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &fmt);
1098                 if (ret < 0)
1099                         return ret;
1100 
1101                 /*
1102                  * All currently existing CEU implementations support 2560x1920
1103                  * or larger frames. If the sensor is proposing too big a frame,
1104                  * don't bother with possibly supportred by the CEU larger
1105                  * sizes, just try VGA multiples. If needed, this can be
1106                  * adjusted in the future.
1107                  */
1108                 while ((mf->width > pcdev->max_width ||
1109                         mf->height > pcdev->max_height) && shift < 4) {
1110                         /* Try 2560x1920, 1280x960, 640x480, 320x240 */
1111                         mf->width       = 2560 >> shift;
1112                         mf->height      = 1920 >> shift;
1113                         ret = v4l2_device_call_until_err(sd->v4l2_dev,
1114                                         soc_camera_grp_id(icd), pad,
1115                                         set_fmt, NULL, &fmt);
1116                         if (ret < 0)
1117                                 return ret;
1118                         shift++;
1119                 }
1120 
1121                 if (shift == 4) {
1122                         dev_err(dev, "Failed to configure the client below %ux%x\n",
1123                                 mf->width, mf->height);
1124                         return -EIO;
1125                 }
1126 
1127                 dev_geo(dev, "camera fmt %ux%u\n", mf->width, mf->height);
1128 
1129                 cam = kzalloc(sizeof(*cam), GFP_KERNEL);
1130                 if (!cam)
1131                         return -ENOMEM;
1132 
1133                 /* We are called with current camera crop, initialise subrect with it */
1134                 cam->rect       = rect;
1135                 cam->subrect    = rect;
1136 
1137                 cam->width      = mf->width;
1138                 cam->height     = mf->height;
1139 
1140                 icd->host_priv = cam;
1141         } else {
1142                 cam = icd->host_priv;
1143         }
1144 
1145         /* Beginning of a pass */
1146         if (!idx)
1147                 cam->extra_fmt = NULL;
1148 
1149         switch (code.code) {
1150         case MEDIA_BUS_FMT_UYVY8_2X8:
1151         case MEDIA_BUS_FMT_VYUY8_2X8:
1152         case MEDIA_BUS_FMT_YUYV8_2X8:
1153         case MEDIA_BUS_FMT_YVYU8_2X8:
1154                 if (cam->extra_fmt)
1155                         break;
1156 
1157                 /*
1158                  * Our case is simple so far: for any of the above four camera
1159                  * formats we add all our four synthesized NV* formats, so,
1160                  * just marking the device with a single flag suffices. If
1161                  * the format generation rules are more complex, you would have
1162                  * to actually hang your already added / counted formats onto
1163                  * the host_priv pointer and check whether the format you're
1164                  * going to add now is already there.
1165                  */
1166                 cam->extra_fmt = sh_mobile_ceu_formats;
1167 
1168                 n = ARRAY_SIZE(sh_mobile_ceu_formats);
1169                 formats += n;
1170                 for (k = 0; xlate && k < n; k++) {
1171                         xlate->host_fmt = &sh_mobile_ceu_formats[k];
1172                         xlate->code     = code.code;
1173                         xlate++;
1174                         dev_dbg(dev, "Providing format %s using code %d\n",
1175                                 sh_mobile_ceu_formats[k].name, code.code);
1176                 }
1177                 break;
1178         default:
1179                 if (!sh_mobile_ceu_packing_supported(fmt))
1180                         return 0;
1181         }
1182 
1183         /* Generic pass-through */
1184         formats++;
1185         if (xlate) {
1186                 xlate->host_fmt = fmt;
1187                 xlate->code     = code.code;
1188                 xlate++;
1189                 dev_dbg(dev, "Providing format %s in pass-through mode\n",
1190                         fmt->name);
1191         }
1192 
1193         return formats;
1194 }
1195 
1196 static void sh_mobile_ceu_put_formats(struct soc_camera_device *icd)
1197 {
1198         kfree(icd->host_priv);
1199         icd->host_priv = NULL;
1200 }
1201 
1202 #define scale_down(size, scale) soc_camera_shift_scale(size, 12, scale)
1203 #define calc_generic_scale(in, out) soc_camera_calc_scale(in, 12, out)
1204 
1205 /*
1206  * CEU can scale and crop, but we don't want to waste bandwidth and kill the
1207  * framerate by always requesting the maximum image from the client. See
1208  * Documentation/video4linux/sh_mobile_ceu_camera.txt for a description of
1209  * scaling and cropping algorithms and for the meaning of referenced here steps.
1210  */
1211 static int sh_mobile_ceu_set_crop(struct soc_camera_device *icd,
1212                                   const struct v4l2_crop *a)
1213 {
1214         struct v4l2_crop a_writable = *a;
1215         const struct v4l2_rect *rect = &a_writable.c;
1216         struct device *dev = icd->parent;
1217         struct soc_camera_host *ici = to_soc_camera_host(dev);
1218         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1219         struct v4l2_crop cam_crop;
1220         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1221         struct v4l2_rect *cam_rect = &cam_crop.c;
1222         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1223         struct v4l2_subdev_format fmt = {
1224                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1225         };
1226         struct v4l2_mbus_framefmt *mf = &fmt.format;
1227         unsigned int scale_cam_h, scale_cam_v, scale_ceu_h, scale_ceu_v,
1228                 out_width, out_height;
1229         int interm_width, interm_height;
1230         u32 capsr, cflcr;
1231         int ret;
1232 
1233         dev_geo(dev, "S_CROP(%ux%u@%u:%u)\n", rect->width, rect->height,
1234                 rect->left, rect->top);
1235 
1236         /* During camera cropping its output window can change too, stop CEU */
1237         capsr = capture_save_reset(pcdev);
1238         dev_dbg(dev, "CAPSR 0x%x, CFLCR 0x%x\n", capsr, pcdev->cflcr);
1239 
1240         /*
1241          * 1. - 2. Apply iterative camera S_CROP for new input window, read back
1242          * actual camera rectangle.
1243          */
1244         ret = soc_camera_client_s_crop(sd, &a_writable, &cam_crop,
1245                                        &cam->rect, &cam->subrect);
1246         if (ret < 0)
1247                 return ret;
1248 
1249         dev_geo(dev, "1-2: camera cropped to %ux%u@%u:%u\n",
1250                 cam_rect->width, cam_rect->height,
1251                 cam_rect->left, cam_rect->top);
1252 
1253         /* On success cam_crop contains current camera crop */
1254 
1255         /* 3. Retrieve camera output window */
1256         ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &fmt);
1257         if (ret < 0)
1258                 return ret;
1259 
1260         if (mf->width > pcdev->max_width || mf->height > pcdev->max_height)
1261                 return -EINVAL;
1262 
1263         /* 4. Calculate camera scales */
1264         scale_cam_h     = calc_generic_scale(cam_rect->width, mf->width);
1265         scale_cam_v     = calc_generic_scale(cam_rect->height, mf->height);
1266 
1267         /* Calculate intermediate window */
1268         interm_width    = scale_down(rect->width, scale_cam_h);
1269         interm_height   = scale_down(rect->height, scale_cam_v);
1270 
1271         if (interm_width < icd->user_width) {
1272                 u32 new_scale_h;
1273 
1274                 new_scale_h = calc_generic_scale(rect->width, icd->user_width);
1275 
1276                 mf->width = scale_down(cam_rect->width, new_scale_h);
1277         }
1278 
1279         if (interm_height < icd->user_height) {
1280                 u32 new_scale_v;
1281 
1282                 new_scale_v = calc_generic_scale(rect->height, icd->user_height);
1283 
1284                 mf->height = scale_down(cam_rect->height, new_scale_v);
1285         }
1286 
1287         if (interm_width < icd->user_width || interm_height < icd->user_height) {
1288                 ret = v4l2_device_call_until_err(sd->v4l2_dev,
1289                                         soc_camera_grp_id(icd), pad,
1290                                         set_fmt, NULL, &fmt);
1291                 if (ret < 0)
1292                         return ret;
1293 
1294                 dev_geo(dev, "New camera output %ux%u\n", mf->width, mf->height);
1295                 scale_cam_h     = calc_generic_scale(cam_rect->width, mf->width);
1296                 scale_cam_v     = calc_generic_scale(cam_rect->height, mf->height);
1297                 interm_width    = scale_down(rect->width, scale_cam_h);
1298                 interm_height   = scale_down(rect->height, scale_cam_v);
1299         }
1300 
1301         /* Cache camera output window */
1302         cam->width      = mf->width;
1303         cam->height     = mf->height;
1304 
1305         if (pcdev->image_mode) {
1306                 out_width       = min(interm_width, icd->user_width);
1307                 out_height      = min(interm_height, icd->user_height);
1308         } else {
1309                 out_width       = interm_width;
1310                 out_height      = interm_height;
1311         }
1312 
1313         /*
1314          * 5. Calculate CEU scales from camera scales from results of (5) and
1315          *    the user window
1316          */
1317         scale_ceu_h     = calc_scale(interm_width, &out_width);
1318         scale_ceu_v     = calc_scale(interm_height, &out_height);
1319 
1320         dev_geo(dev, "5: CEU scales %u:%u\n", scale_ceu_h, scale_ceu_v);
1321 
1322         /* Apply CEU scales. */
1323         cflcr = scale_ceu_h | (scale_ceu_v << 16);
1324         if (cflcr != pcdev->cflcr) {
1325                 pcdev->cflcr = cflcr;
1326                 ceu_write(pcdev, CFLCR, cflcr);
1327         }
1328 
1329         icd->user_width  = out_width & ~3;
1330         icd->user_height = out_height & ~3;
1331         /* Offsets are applied at the CEU scaling filter input */
1332         cam->ceu_left    = scale_down(rect->left - cam_rect->left, scale_cam_h) & ~1;
1333         cam->ceu_top     = scale_down(rect->top - cam_rect->top, scale_cam_v) & ~1;
1334 
1335         /* 6. Use CEU cropping to crop to the new window. */
1336         sh_mobile_ceu_set_rect(icd);
1337 
1338         cam->subrect = *rect;
1339 
1340         dev_geo(dev, "6: CEU cropped to %ux%u@%u:%u\n",
1341                 icd->user_width, icd->user_height,
1342                 cam->ceu_left, cam->ceu_top);
1343 
1344         /* Restore capture. The CE bit can be cleared by the hardware */
1345         if (pcdev->active)
1346                 capsr |= 1;
1347         capture_restore(pcdev, capsr);
1348 
1349         /* Even if only camera cropping succeeded */
1350         return ret;
1351 }
1352 
1353 static int sh_mobile_ceu_get_crop(struct soc_camera_device *icd,
1354                                   struct v4l2_crop *a)
1355 {
1356         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1357 
1358         a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1359         a->c = cam->subrect;
1360 
1361         return 0;
1362 }
1363 
1364 /* Similar to set_crop multistage iterative algorithm */
1365 static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
1366                                  struct v4l2_format *f)
1367 {
1368         struct device *dev = icd->parent;
1369         struct soc_camera_host *ici = to_soc_camera_host(dev);
1370         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1371         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1372         struct v4l2_pix_format *pix = &f->fmt.pix;
1373         struct v4l2_mbus_framefmt mf;
1374         __u32 pixfmt = pix->pixelformat;
1375         const struct soc_camera_format_xlate *xlate;
1376         unsigned int ceu_sub_width = pcdev->max_width,
1377                 ceu_sub_height = pcdev->max_height;
1378         u16 scale_v, scale_h;
1379         int ret;
1380         bool image_mode;
1381         enum v4l2_field field;
1382 
1383         switch (pix->field) {
1384         default:
1385                 pix->field = V4L2_FIELD_NONE;
1386                 /* fall-through */
1387         case V4L2_FIELD_INTERLACED_TB:
1388         case V4L2_FIELD_INTERLACED_BT:
1389         case V4L2_FIELD_NONE:
1390                 field = pix->field;
1391                 break;
1392         case V4L2_FIELD_INTERLACED:
1393                 field = V4L2_FIELD_INTERLACED_TB;
1394                 break;
1395         }
1396 
1397         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1398         if (!xlate) {
1399                 dev_warn(dev, "Format %x not found\n", pixfmt);
1400                 return -EINVAL;
1401         }
1402 
1403         /* 1.-4. Calculate desired client output geometry */
1404         soc_camera_calc_client_output(icd, &cam->rect, &cam->subrect, pix, &mf, 12);
1405         mf.field        = pix->field;
1406         mf.colorspace   = pix->colorspace;
1407         mf.code         = xlate->code;
1408 
1409         switch (pixfmt) {
1410         case V4L2_PIX_FMT_NV12:
1411         case V4L2_PIX_FMT_NV21:
1412         case V4L2_PIX_FMT_NV16:
1413         case V4L2_PIX_FMT_NV61:
1414                 image_mode = true;
1415                 break;
1416         default:
1417                 image_mode = false;
1418         }
1419 
1420         dev_geo(dev, "S_FMT(pix=0x%x, fld 0x%x, code 0x%x, %ux%u)\n", pixfmt, mf.field, mf.code,
1421                 pix->width, pix->height);
1422 
1423         dev_geo(dev, "4: request camera output %ux%u\n", mf.width, mf.height);
1424 
1425         /* 5. - 9. */
1426         ret = soc_camera_client_scale(icd, &cam->rect, &cam->subrect,
1427                                 &mf, &ceu_sub_width, &ceu_sub_height,
1428                                 image_mode && V4L2_FIELD_NONE == field, 12);
1429 
1430         dev_geo(dev, "5-9: client scale return %d\n", ret);
1431 
1432         /* Done with the camera. Now see if we can improve the result */
1433 
1434         dev_geo(dev, "fmt %ux%u, requested %ux%u\n",
1435                 mf.width, mf.height, pix->width, pix->height);
1436         if (ret < 0)
1437                 return ret;
1438 
1439         if (mf.code != xlate->code)
1440                 return -EINVAL;
1441 
1442         /* 9. Prepare CEU crop */
1443         cam->width = mf.width;
1444         cam->height = mf.height;
1445 
1446         /* 10. Use CEU scaling to scale to the requested user window. */
1447 
1448         /* We cannot scale up */
1449         if (pix->width > ceu_sub_width)
1450                 ceu_sub_width = pix->width;
1451 
1452         if (pix->height > ceu_sub_height)
1453                 ceu_sub_height = pix->height;
1454 
1455         pix->colorspace = mf.colorspace;
1456 
1457         if (image_mode) {
1458                 /* Scale pix->{width x height} down to width x height */
1459                 scale_h         = calc_scale(ceu_sub_width, &pix->width);
1460                 scale_v         = calc_scale(ceu_sub_height, &pix->height);
1461         } else {
1462                 pix->width      = ceu_sub_width;
1463                 pix->height     = ceu_sub_height;
1464                 scale_h         = 0;
1465                 scale_v         = 0;
1466         }
1467 
1468         pcdev->cflcr = scale_h | (scale_v << 16);
1469 
1470         /*
1471          * We have calculated CFLCR, the actual configuration will be performed
1472          * in sh_mobile_ceu_set_bus_param()
1473          */
1474 
1475         dev_geo(dev, "10: W: %u : 0x%x = %u, H: %u : 0x%x = %u\n",
1476                 ceu_sub_width, scale_h, pix->width,
1477                 ceu_sub_height, scale_v, pix->height);
1478 
1479         cam->code               = xlate->code;
1480         icd->current_fmt        = xlate;
1481 
1482         pcdev->field = field;
1483         pcdev->image_mode = image_mode;
1484 
1485         /* CFSZR requirement */
1486         pix->width      &= ~3;
1487         pix->height     &= ~3;
1488 
1489         return 0;
1490 }
1491 
1492 #define CEU_CHDW_MAX    8188U   /* Maximum line stride */
1493 
1494 static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
1495                                  struct v4l2_format *f)
1496 {
1497         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1498         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1499         const struct soc_camera_format_xlate *xlate;
1500         struct v4l2_pix_format *pix = &f->fmt.pix;
1501         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1502         struct v4l2_subdev_pad_config pad_cfg;
1503         struct v4l2_subdev_format format = {
1504                 .which = V4L2_SUBDEV_FORMAT_TRY,
1505         };
1506         struct v4l2_mbus_framefmt *mf = &format.format;
1507         __u32 pixfmt = pix->pixelformat;
1508         int width, height;
1509         int ret;
1510 
1511         dev_geo(icd->parent, "TRY_FMT(pix=0x%x, %ux%u)\n",
1512                  pixfmt, pix->width, pix->height);
1513 
1514         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1515         if (!xlate) {
1516                 xlate = icd->current_fmt;
1517                 dev_dbg(icd->parent, "Format %x not found, keeping %x\n",
1518                         pixfmt, xlate->host_fmt->fourcc);
1519                 pixfmt = xlate->host_fmt->fourcc;
1520                 pix->pixelformat = pixfmt;
1521                 pix->colorspace = icd->colorspace;
1522         }
1523 
1524         /* FIXME: calculate using depth and bus width */
1525 
1526         /* CFSZR requires height and width to be 4-pixel aligned */
1527         v4l_bound_align_image(&pix->width, 2, pcdev->max_width, 2,
1528                               &pix->height, 4, pcdev->max_height, 2, 0);
1529 
1530         width = pix->width;
1531         height = pix->height;
1532 
1533         /* limit to sensor capabilities */
1534         mf->width       = pix->width;
1535         mf->height      = pix->height;
1536         mf->field       = pix->field;
1537         mf->code        = xlate->code;
1538         mf->colorspace  = pix->colorspace;
1539 
1540         ret = v4l2_device_call_until_err(sd->v4l2_dev, soc_camera_grp_id(icd),
1541                                          pad, set_fmt, &pad_cfg, &format);
1542         if (ret < 0)
1543                 return ret;
1544 
1545         pix->width      = mf->width;
1546         pix->height     = mf->height;
1547         pix->field      = mf->field;
1548         pix->colorspace = mf->colorspace;
1549 
1550         switch (pixfmt) {
1551         case V4L2_PIX_FMT_NV12:
1552         case V4L2_PIX_FMT_NV21:
1553         case V4L2_PIX_FMT_NV16:
1554         case V4L2_PIX_FMT_NV61:
1555                 /* FIXME: check against rect_max after converting soc-camera */
1556                 /* We can scale precisely, need a bigger image from camera */
1557                 if (pix->width < width || pix->height < height) {
1558                         /*
1559                          * We presume, the sensor behaves sanely, i.e., if
1560                          * requested a bigger rectangle, it will not return a
1561                          * smaller one.
1562                          */
1563                         mf->width = pcdev->max_width;
1564                         mf->height = pcdev->max_height;
1565                         ret = v4l2_device_call_until_err(sd->v4l2_dev,
1566                                         soc_camera_grp_id(icd), pad,
1567                                         set_fmt, &pad_cfg, &format);
1568                         if (ret < 0) {
1569                                 /* Shouldn't actually happen... */
1570                                 dev_err(icd->parent,
1571                                         "FIXME: client try_fmt() = %d\n", ret);
1572                                 return ret;
1573                         }
1574                 }
1575                 /* We will scale exactly */
1576                 if (mf->width > width)
1577                         pix->width = width;
1578                 if (mf->height > height)
1579                         pix->height = height;
1580 
1581                 pix->bytesperline = max(pix->bytesperline, pix->width);
1582                 pix->bytesperline = min(pix->bytesperline, CEU_CHDW_MAX);
1583                 pix->bytesperline &= ~3;
1584                 break;
1585 
1586         default:
1587                 /* Configurable stride isn't supported in pass-through mode. */
1588                 pix->bytesperline  = 0;
1589         }
1590 
1591         pix->width      &= ~3;
1592         pix->height     &= ~3;
1593         pix->sizeimage  = 0;
1594 
1595         dev_geo(icd->parent, "%s(): return %d, fmt 0x%x, %ux%u\n",
1596                 __func__, ret, pix->pixelformat, pix->width, pix->height);
1597 
1598         return ret;
1599 }
1600 
1601 static int sh_mobile_ceu_set_livecrop(struct soc_camera_device *icd,
1602                                       const struct v4l2_crop *a)
1603 {
1604         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1605         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1606         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1607         u32 out_width = icd->user_width, out_height = icd->user_height;
1608         int ret;
1609 
1610         /* Freeze queue */
1611         pcdev->frozen = 1;
1612         /* Wait for frame */
1613         ret = wait_for_completion_interruptible(&pcdev->complete);
1614         /* Stop the client */
1615         ret = v4l2_subdev_call(sd, video, s_stream, 0);
1616         if (ret < 0)
1617                 dev_warn(icd->parent,
1618                          "Client failed to stop the stream: %d\n", ret);
1619         else
1620                 /* Do the crop, if it fails, there's nothing more we can do */
1621                 sh_mobile_ceu_set_crop(icd, a);
1622 
1623         dev_geo(icd->parent, "Output after crop: %ux%u\n", icd->user_width, icd->user_height);
1624 
1625         if (icd->user_width != out_width || icd->user_height != out_height) {
1626                 struct v4l2_format f = {
1627                         .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1628                         .fmt.pix        = {
1629                                 .width          = out_width,
1630                                 .height         = out_height,
1631                                 .pixelformat    = icd->current_fmt->host_fmt->fourcc,
1632                                 .field          = pcdev->field,
1633                                 .colorspace     = icd->colorspace,
1634                         },
1635                 };
1636                 ret = sh_mobile_ceu_set_fmt(icd, &f);
1637                 if (!ret && (out_width != f.fmt.pix.width ||
1638                              out_height != f.fmt.pix.height))
1639                         ret = -EINVAL;
1640                 if (!ret) {
1641                         icd->user_width         = out_width & ~3;
1642                         icd->user_height        = out_height & ~3;
1643                         ret = sh_mobile_ceu_set_bus_param(icd);
1644                 }
1645         }
1646 
1647         /* Thaw the queue */
1648         pcdev->frozen = 0;
1649         spin_lock_irq(&pcdev->lock);
1650         sh_mobile_ceu_capture(pcdev);
1651         spin_unlock_irq(&pcdev->lock);
1652         /* Start the client */
1653         ret = v4l2_subdev_call(sd, video, s_stream, 1);
1654         return ret;
1655 }
1656 
1657 static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
1658 {
1659         struct soc_camera_device *icd = file->private_data;
1660 
1661         return vb2_poll(&icd->vb2_vidq, file, pt);
1662 }
1663 
1664 static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
1665                                   struct v4l2_capability *cap)
1666 {
1667         strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
1668         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1669         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1670 
1671         return 0;
1672 }
1673 
1674 static int sh_mobile_ceu_init_videobuf(struct vb2_queue *q,
1675                                        struct soc_camera_device *icd)
1676 {
1677         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1678 
1679         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1680         q->io_modes = VB2_MMAP | VB2_USERPTR;
1681         q->drv_priv = icd;
1682         q->ops = &sh_mobile_ceu_videobuf_ops;
1683         q->mem_ops = &vb2_dma_contig_memops;
1684         q->buf_struct_size = sizeof(struct sh_mobile_ceu_buffer);
1685         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1686         q->lock = &ici->host_lock;
1687 
1688         return vb2_queue_init(q);
1689 }
1690 
1691 static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
1692         .owner          = THIS_MODULE,
1693         .add            = sh_mobile_ceu_add_device,
1694         .remove         = sh_mobile_ceu_remove_device,
1695         .clock_start    = sh_mobile_ceu_clock_start,
1696         .clock_stop     = sh_mobile_ceu_clock_stop,
1697         .get_formats    = sh_mobile_ceu_get_formats,
1698         .put_formats    = sh_mobile_ceu_put_formats,
1699         .get_crop       = sh_mobile_ceu_get_crop,
1700         .set_crop       = sh_mobile_ceu_set_crop,
1701         .set_livecrop   = sh_mobile_ceu_set_livecrop,
1702         .set_fmt        = sh_mobile_ceu_set_fmt,
1703         .try_fmt        = sh_mobile_ceu_try_fmt,
1704         .poll           = sh_mobile_ceu_poll,
1705         .querycap       = sh_mobile_ceu_querycap,
1706         .set_bus_param  = sh_mobile_ceu_set_bus_param,
1707         .init_videobuf2 = sh_mobile_ceu_init_videobuf,
1708 };
1709 
1710 struct bus_wait {
1711         struct notifier_block   notifier;
1712         struct completion       completion;
1713         struct device           *dev;
1714 };
1715 
1716 static int bus_notify(struct notifier_block *nb,
1717                       unsigned long action, void *data)
1718 {
1719         struct device *dev = data;
1720         struct bus_wait *wait = container_of(nb, struct bus_wait, notifier);
1721 
1722         if (wait->dev != dev)
1723                 return NOTIFY_DONE;
1724 
1725         switch (action) {
1726         case BUS_NOTIFY_UNBOUND_DRIVER:
1727                 /* Protect from module unloading */
1728                 wait_for_completion(&wait->completion);
1729                 return NOTIFY_OK;
1730         }
1731         return NOTIFY_DONE;
1732 }
1733 
1734 static int sh_mobile_ceu_probe(struct platform_device *pdev)
1735 {
1736         struct sh_mobile_ceu_dev *pcdev;
1737         struct resource *res;
1738         void __iomem *base;
1739         unsigned int irq;
1740         int err, i;
1741         struct bus_wait wait = {
1742                 .completion = COMPLETION_INITIALIZER_ONSTACK(wait.completion),
1743                 .notifier.notifier_call = bus_notify,
1744         };
1745         struct sh_mobile_ceu_companion *csi2;
1746 
1747         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1748         irq = platform_get_irq(pdev, 0);
1749         if (!res || (int)irq <= 0) {
1750                 dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
1751                 return -ENODEV;
1752         }
1753 
1754         pcdev = devm_kzalloc(&pdev->dev, sizeof(*pcdev), GFP_KERNEL);
1755         if (!pcdev) {
1756                 dev_err(&pdev->dev, "Could not allocate pcdev\n");
1757                 return -ENOMEM;
1758         }
1759 
1760         INIT_LIST_HEAD(&pcdev->capture);
1761         spin_lock_init(&pcdev->lock);
1762         init_completion(&pcdev->complete);
1763 
1764         pcdev->pdata = pdev->dev.platform_data;
1765         if (!pcdev->pdata && !pdev->dev.of_node) {
1766                 dev_err(&pdev->dev, "CEU platform data not set.\n");
1767                 return -EINVAL;
1768         }
1769 
1770         /* TODO: implement per-device bus flags */
1771         if (pcdev->pdata) {
1772                 pcdev->max_width = pcdev->pdata->max_width;
1773                 pcdev->max_height = pcdev->pdata->max_height;
1774                 pcdev->flags = pcdev->pdata->flags;
1775         }
1776 
1777         if (!pcdev->max_width) {
1778                 unsigned int v;
1779                 err = of_property_read_u32(pdev->dev.of_node, "renesas,max-width", &v);
1780                 if (!err)
1781                         pcdev->max_width = v;
1782 
1783                 if (!pcdev->max_width)
1784                         pcdev->max_width = 2560;
1785         }
1786         if (!pcdev->max_height) {
1787                 unsigned int v;
1788                 err = of_property_read_u32(pdev->dev.of_node, "renesas,max-height", &v);
1789                 if (!err)
1790                         pcdev->max_height = v;
1791 
1792                 if (!pcdev->max_height)
1793                         pcdev->max_height = 1920;
1794         }
1795 
1796         base = devm_ioremap_resource(&pdev->dev, res);
1797         if (IS_ERR(base))
1798                 return PTR_ERR(base);
1799 
1800         pcdev->irq = irq;
1801         pcdev->base = base;
1802         pcdev->video_limit = 0; /* only enabled if second resource exists */
1803 
1804         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1805         if (res) {
1806                 err = dma_declare_coherent_memory(&pdev->dev, res->start,
1807                                                   res->start,
1808                                                   resource_size(res),
1809                                                   DMA_MEMORY_MAP |
1810                                                   DMA_MEMORY_EXCLUSIVE);
1811                 if (!err) {
1812                         dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
1813                         return -ENXIO;
1814                 }
1815 
1816                 pcdev->video_limit = resource_size(res);
1817         }
1818 
1819         /* request irq */
1820         err = devm_request_irq(&pdev->dev, pcdev->irq, sh_mobile_ceu_irq,
1821                                0, dev_name(&pdev->dev), pcdev);
1822         if (err) {
1823                 dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
1824                 goto exit_release_mem;
1825         }
1826 
1827         pm_suspend_ignore_children(&pdev->dev, true);
1828         pm_runtime_enable(&pdev->dev);
1829         pm_runtime_resume(&pdev->dev);
1830 
1831         pcdev->ici.priv = pcdev;
1832         pcdev->ici.v4l2_dev.dev = &pdev->dev;
1833         pcdev->ici.nr = pdev->id;
1834         pcdev->ici.drv_name = dev_name(&pdev->dev);
1835         pcdev->ici.ops = &sh_mobile_ceu_host_ops;
1836         pcdev->ici.capabilities = SOCAM_HOST_CAP_STRIDE;
1837 
1838         pcdev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
1839         if (IS_ERR(pcdev->alloc_ctx)) {
1840                 err = PTR_ERR(pcdev->alloc_ctx);
1841                 goto exit_free_clk;
1842         }
1843 
1844         if (pcdev->pdata && pcdev->pdata->asd_sizes) {
1845                 struct v4l2_async_subdev **asd;
1846                 char name[] = "sh-mobile-csi2";
1847                 int j;
1848 
1849                 /*
1850                  * CSI2 interfacing: several groups can use CSI2, pick up the
1851                  * first one
1852                  */
1853                 asd = pcdev->pdata->asd;
1854                 for (j = 0; pcdev->pdata->asd_sizes[j]; j++) {
1855                         for (i = 0; i < pcdev->pdata->asd_sizes[j]; i++, asd++) {
1856                                 dev_dbg(&pdev->dev, "%s(): subdev #%d, type %u\n",
1857                                         __func__, i, (*asd)->match_type);
1858                                 if ((*asd)->match_type == V4L2_ASYNC_MATCH_DEVNAME &&
1859                                     !strncmp(name, (*asd)->match.device_name.name,
1860                                              sizeof(name) - 1)) {
1861                                         pcdev->csi2_asd = *asd;
1862                                         break;
1863                                 }
1864                         }
1865                         if (pcdev->csi2_asd)
1866                                 break;
1867                 }
1868 
1869                 pcdev->ici.asd = pcdev->pdata->asd;
1870                 pcdev->ici.asd_sizes = pcdev->pdata->asd_sizes;
1871         }
1872 
1873         /* Legacy CSI2 interfacing */
1874         csi2 = pcdev->pdata ? pcdev->pdata->csi2 : NULL;
1875         if (csi2) {
1876                 /*
1877                  * TODO: remove this once all users are converted to
1878                  * asynchronous CSI2 probing. If it has to be kept, csi2
1879                  * platform device resources have to be added, using
1880                  * platform_device_add_resources()
1881                  */
1882                 struct platform_device *csi2_pdev =
1883                         platform_device_alloc("sh-mobile-csi2", csi2->id);
1884                 struct sh_csi2_pdata *csi2_pdata = csi2->platform_data;
1885 
1886                 if (!csi2_pdev) {
1887                         err = -ENOMEM;
1888                         goto exit_free_ctx;
1889                 }
1890 
1891                 pcdev->csi2_pdev                = csi2_pdev;
1892 
1893                 err = platform_device_add_data(csi2_pdev, csi2_pdata,
1894                                                sizeof(*csi2_pdata));
1895                 if (err < 0)
1896                         goto exit_pdev_put;
1897 
1898                 csi2_pdev->resource             = csi2->resource;
1899                 csi2_pdev->num_resources        = csi2->num_resources;
1900 
1901                 err = platform_device_add(csi2_pdev);
1902                 if (err < 0)
1903                         goto exit_pdev_put;
1904 
1905                 wait.dev = &csi2_pdev->dev;
1906 
1907                 err = bus_register_notifier(&platform_bus_type, &wait.notifier);
1908                 if (err < 0)
1909                         goto exit_pdev_unregister;
1910 
1911                 /*
1912                  * From this point the driver module will not unload, until
1913                  * we complete the completion.
1914                  */
1915 
1916                 if (!csi2_pdev->dev.driver) {
1917                         complete(&wait.completion);
1918                         /* Either too late, or probing failed */
1919                         bus_unregister_notifier(&platform_bus_type, &wait.notifier);
1920                         err = -ENXIO;
1921                         goto exit_pdev_unregister;
1922                 }
1923 
1924                 /*
1925                  * The module is still loaded, in the worst case it is hanging
1926                  * in device release on our completion. So, _now_ dereferencing
1927                  * the "owner" is safe!
1928                  */
1929 
1930                 err = try_module_get(csi2_pdev->dev.driver->owner);
1931 
1932                 /* Let notifier complete, if it has been locked */
1933                 complete(&wait.completion);
1934                 bus_unregister_notifier(&platform_bus_type, &wait.notifier);
1935                 if (!err) {
1936                         err = -ENODEV;
1937                         goto exit_pdev_unregister;
1938                 }
1939 
1940                 pcdev->csi2_sd = platform_get_drvdata(csi2_pdev);
1941         }
1942 
1943         err = soc_camera_host_register(&pcdev->ici);
1944         if (err)
1945                 goto exit_csi2_unregister;
1946 
1947         if (csi2) {
1948                 err = v4l2_device_register_subdev(&pcdev->ici.v4l2_dev,
1949                                                   pcdev->csi2_sd);
1950                 dev_dbg(&pdev->dev, "%s(): ret(register_subdev) = %d\n",
1951                         __func__, err);
1952                 if (err < 0)
1953                         goto exit_host_unregister;
1954                 /* v4l2_device_register_subdev() took a reference too */
1955                 module_put(pcdev->csi2_sd->owner);
1956         }
1957 
1958         return 0;
1959 
1960 exit_host_unregister:
1961         soc_camera_host_unregister(&pcdev->ici);
1962 exit_csi2_unregister:
1963         if (csi2) {
1964                 module_put(pcdev->csi2_pdev->dev.driver->owner);
1965 exit_pdev_unregister:
1966                 platform_device_del(pcdev->csi2_pdev);
1967 exit_pdev_put:
1968                 pcdev->csi2_pdev->resource = NULL;
1969                 platform_device_put(pcdev->csi2_pdev);
1970         }
1971 exit_free_ctx:
1972         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
1973 exit_free_clk:
1974         pm_runtime_disable(&pdev->dev);
1975 exit_release_mem:
1976         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
1977                 dma_release_declared_memory(&pdev->dev);
1978         return err;
1979 }
1980 
1981 static int sh_mobile_ceu_remove(struct platform_device *pdev)
1982 {
1983         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
1984         struct sh_mobile_ceu_dev *pcdev = container_of(soc_host,
1985                                         struct sh_mobile_ceu_dev, ici);
1986         struct platform_device *csi2_pdev = pcdev->csi2_pdev;
1987 
1988         soc_camera_host_unregister(soc_host);
1989         pm_runtime_disable(&pdev->dev);
1990         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
1991                 dma_release_declared_memory(&pdev->dev);
1992         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
1993         if (csi2_pdev && csi2_pdev->dev.driver) {
1994                 struct module *csi2_drv = csi2_pdev->dev.driver->owner;
1995                 platform_device_del(csi2_pdev);
1996                 csi2_pdev->resource = NULL;
1997                 platform_device_put(csi2_pdev);
1998                 module_put(csi2_drv);
1999         }
2000 
2001         return 0;
2002 }
2003 
2004 static int sh_mobile_ceu_runtime_nop(struct device *dev)
2005 {
2006         /* Runtime PM callback shared between ->runtime_suspend()
2007          * and ->runtime_resume(). Simply returns success.
2008          *
2009          * This driver re-initializes all registers after
2010          * pm_runtime_get_sync() anyway so there is no need
2011          * to save and restore registers here.
2012          */
2013         return 0;
2014 }
2015 
2016 static const struct dev_pm_ops sh_mobile_ceu_dev_pm_ops = {
2017         .runtime_suspend = sh_mobile_ceu_runtime_nop,
2018         .runtime_resume = sh_mobile_ceu_runtime_nop,
2019 };
2020 
2021 static const struct of_device_id sh_mobile_ceu_of_match[] = {
2022         { .compatible = "renesas,sh-mobile-ceu" },
2023         { }
2024 };
2025 MODULE_DEVICE_TABLE(of, sh_mobile_ceu_of_match);
2026 
2027 static struct platform_driver sh_mobile_ceu_driver = {
2028         .driver         = {
2029                 .name   = "sh_mobile_ceu",
2030                 .pm     = &sh_mobile_ceu_dev_pm_ops,
2031                 .of_match_table = sh_mobile_ceu_of_match,
2032         },
2033         .probe          = sh_mobile_ceu_probe,
2034         .remove         = sh_mobile_ceu_remove,
2035 };
2036 
2037 static int __init sh_mobile_ceu_init(void)
2038 {
2039         /* Whatever return code */
2040         request_module("sh_mobile_csi2");
2041         return platform_driver_register(&sh_mobile_ceu_driver);
2042 }
2043 
2044 static void __exit sh_mobile_ceu_exit(void)
2045 {
2046         platform_driver_unregister(&sh_mobile_ceu_driver);
2047 }
2048 
2049 module_init(sh_mobile_ceu_init);
2050 module_exit(sh_mobile_ceu_exit);
2051 
2052 MODULE_DESCRIPTION("SuperH Mobile CEU driver");
2053 MODULE_AUTHOR("Magnus Damm");
2054 MODULE_LICENSE("GPL");
2055 MODULE_VERSION("0.1.0");
2056 MODULE_ALIAS("platform:sh_mobile_ceu");
2057 

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