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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/drv-intf/sh_mobile_csi2.h>
 45 #include <media/videobuf2-dma-contig.h>
 46 #include <media/v4l2-mediabus.h>
 47 #include <media/drv-intf/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_v4l2_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_v4l2_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_v4l2_buffer *vbuf)
156 {
157         return container_of(vbuf, 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                         unsigned int *count, unsigned int *num_planes,
214                         unsigned int sizes[], void *alloc_ctxs[])
215 {
216         struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
217         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
218         struct sh_mobile_ceu_dev *pcdev = ici->priv;
219 
220         alloc_ctxs[0] = pcdev->alloc_ctx;
221 
222         if (!vq->num_buffers)
223                 pcdev->sequence = 0;
224 
225         if (!*count)
226                 *count = 2;
227 
228         /* Called from VIDIOC_REQBUFS or in compatibility mode */
229         if (!*num_planes)
230                 sizes[0] = icd->sizeimage;
231         else if (sizes[0] < icd->sizeimage)
232                 return -EINVAL;
233 
234         /* If *num_planes != 0, we have already verified *count. */
235         if (pcdev->video_limit) {
236                 size_t size = PAGE_ALIGN(sizes[0]) * *count;
237 
238                 if (size + pcdev->buf_total > pcdev->video_limit)
239                         *count = (pcdev->video_limit - pcdev->buf_total) /
240                                 PAGE_ALIGN(sizes[0]);
241         }
242 
243         *num_planes = 1;
244 
245         dev_dbg(icd->parent, "count=%d, size=%u\n", *count, sizes[0]);
246 
247         return 0;
248 }
249 
250 #define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */
251 #define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */
252 #define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */
253 #define CEU_CEIER_VBP   (1 << 20) /* vbp error */
254 #define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */
255 #define CEU_CEIER_MASK (CEU_CEIER_CPEIE | CEU_CEIER_VBP)
256 
257 
258 /*
259  * return value doesn't reflex the success/failure to queue the new buffer,
260  * but rather the status of the previous buffer.
261  */
262 static int sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
263 {
264         struct soc_camera_device *icd = pcdev->ici.icd;
265         dma_addr_t phys_addr_top, phys_addr_bottom;
266         unsigned long top1, top2;
267         unsigned long bottom1, bottom2;
268         u32 status;
269         bool planar;
270         int ret = 0;
271 
272         /*
273          * The hardware is _very_ picky about this sequence. Especially
274          * the CEU_CETCR_MAGIC value. It seems like we need to acknowledge
275          * several not-so-well documented interrupt sources in CETCR.
276          */
277         ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_MASK);
278         status = ceu_read(pcdev, CETCR);
279         ceu_write(pcdev, CETCR, ~status & CEU_CETCR_MAGIC);
280         if (!pcdev->frozen)
281                 ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_MASK);
282         ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP);
283         ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW);
284 
285         /*
286          * When a VBP interrupt occurs, a capture end interrupt does not occur
287          * and the image of that frame is not captured correctly. So, soft reset
288          * is needed here.
289          */
290         if (status & CEU_CEIER_VBP) {
291                 sh_mobile_ceu_soft_reset(pcdev);
292                 ret = -EIO;
293         }
294 
295         if (pcdev->frozen) {
296                 complete(&pcdev->complete);
297                 return ret;
298         }
299 
300         if (!pcdev->active)
301                 return ret;
302 
303         if (V4L2_FIELD_INTERLACED_BT == pcdev->field) {
304                 top1    = CDBYR;
305                 top2    = CDBCR;
306                 bottom1 = CDAYR;
307                 bottom2 = CDACR;
308         } else {
309                 top1    = CDAYR;
310                 top2    = CDACR;
311                 bottom1 = CDBYR;
312                 bottom2 = CDBCR;
313         }
314 
315         phys_addr_top =
316                 vb2_dma_contig_plane_dma_addr(&pcdev->active->vb2_buf, 0);
317 
318         switch (icd->current_fmt->host_fmt->fourcc) {
319         case V4L2_PIX_FMT_NV12:
320         case V4L2_PIX_FMT_NV21:
321         case V4L2_PIX_FMT_NV16:
322         case V4L2_PIX_FMT_NV61:
323                 planar = true;
324                 break;
325         default:
326                 planar = false;
327         }
328 
329         ceu_write(pcdev, top1, phys_addr_top);
330         if (V4L2_FIELD_NONE != pcdev->field) {
331                 phys_addr_bottom = phys_addr_top + icd->bytesperline;
332                 ceu_write(pcdev, bottom1, phys_addr_bottom);
333         }
334 
335         if (planar) {
336                 phys_addr_top += icd->bytesperline * icd->user_height;
337                 ceu_write(pcdev, top2, phys_addr_top);
338                 if (V4L2_FIELD_NONE != pcdev->field) {
339                         phys_addr_bottom = phys_addr_top + icd->bytesperline;
340                         ceu_write(pcdev, bottom2, phys_addr_bottom);
341                 }
342         }
343 
344         ceu_write(pcdev, CAPSR, 0x1); /* start capture */
345 
346         return ret;
347 }
348 
349 static int sh_mobile_ceu_videobuf_prepare(struct vb2_buffer *vb)
350 {
351         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
352         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vbuf);
353 
354         /* Added list head initialization on alloc */
355         WARN(!list_empty(&buf->queue), "Buffer %p on queue!\n", vb);
356 
357         return 0;
358 }
359 
360 static void sh_mobile_ceu_videobuf_queue(struct vb2_buffer *vb)
361 {
362         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
363         struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
364         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
365         struct sh_mobile_ceu_dev *pcdev = ici->priv;
366         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vbuf);
367         unsigned long size;
368 
369         size = icd->sizeimage;
370 
371         if (vb2_plane_size(vb, 0) < size) {
372                 dev_err(icd->parent, "Buffer #%d too small (%lu < %lu)\n",
373                         vb->index, vb2_plane_size(vb, 0), size);
374                 goto error;
375         }
376 
377         vb2_set_plane_payload(vb, 0, size);
378 
379         dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
380                 vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
381 
382 #ifdef DEBUG
383         /*
384          * This can be useful if you want to see if we actually fill
385          * the buffer with something
386          */
387         if (vb2_plane_vaddr(vb, 0))
388                 memset(vb2_plane_vaddr(vb, 0), 0xaa, vb2_get_plane_payload(vb, 0));
389 #endif
390 
391         spin_lock_irq(&pcdev->lock);
392         list_add_tail(&buf->queue, &pcdev->capture);
393 
394         if (!pcdev->active) {
395                 /*
396                  * Because there were no active buffer at this moment,
397                  * we are not interested in the return value of
398                  * sh_mobile_ceu_capture here.
399                  */
400                 pcdev->active = vbuf;
401                 sh_mobile_ceu_capture(pcdev);
402         }
403         spin_unlock_irq(&pcdev->lock);
404 
405         return;
406 
407 error:
408         vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
409 }
410 
411 static void sh_mobile_ceu_videobuf_release(struct vb2_buffer *vb)
412 {
413         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
414         struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
415         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
416         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vbuf);
417         struct sh_mobile_ceu_dev *pcdev = ici->priv;
418 
419         spin_lock_irq(&pcdev->lock);
420 
421         if (pcdev->active == vbuf) {
422                 /* disable capture (release DMA buffer), reset */
423                 ceu_write(pcdev, CAPSR, 1 << 16);
424                 pcdev->active = NULL;
425         }
426 
427         /*
428          * Doesn't hurt also if the list is empty, but it hurts, if queuing the
429          * buffer failed, and .buf_init() hasn't been called
430          */
431         if (buf->queue.next)
432                 list_del_init(&buf->queue);
433 
434         pcdev->buf_total -= PAGE_ALIGN(vb2_plane_size(vb, 0));
435         dev_dbg(icd->parent, "%s() %zu bytes buffers\n", __func__,
436                 pcdev->buf_total);
437 
438         spin_unlock_irq(&pcdev->lock);
439 }
440 
441 static int sh_mobile_ceu_videobuf_init(struct vb2_buffer *vb)
442 {
443         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
444         struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
445         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
446         struct sh_mobile_ceu_dev *pcdev = ici->priv;
447 
448         pcdev->buf_total += PAGE_ALIGN(vb2_plane_size(vb, 0));
449         dev_dbg(icd->parent, "%s() %zu bytes buffers\n", __func__,
450                 pcdev->buf_total);
451 
452         /* This is for locking debugging only */
453         INIT_LIST_HEAD(&to_ceu_vb(vbuf)->queue);
454         return 0;
455 }
456 
457 static void sh_mobile_ceu_stop_streaming(struct vb2_queue *q)
458 {
459         struct soc_camera_device *icd = soc_camera_from_vb2q(q);
460         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
461         struct sh_mobile_ceu_dev *pcdev = ici->priv;
462         struct list_head *buf_head, *tmp;
463 
464         spin_lock_irq(&pcdev->lock);
465 
466         pcdev->active = NULL;
467 
468         list_for_each_safe(buf_head, tmp, &pcdev->capture)
469                 list_del_init(buf_head);
470 
471         spin_unlock_irq(&pcdev->lock);
472 
473         sh_mobile_ceu_soft_reset(pcdev);
474 }
475 
476 static struct vb2_ops sh_mobile_ceu_videobuf_ops = {
477         .queue_setup    = sh_mobile_ceu_videobuf_setup,
478         .buf_prepare    = sh_mobile_ceu_videobuf_prepare,
479         .buf_queue      = sh_mobile_ceu_videobuf_queue,
480         .buf_cleanup    = sh_mobile_ceu_videobuf_release,
481         .buf_init       = sh_mobile_ceu_videobuf_init,
482         .wait_prepare   = vb2_ops_wait_prepare,
483         .wait_finish    = vb2_ops_wait_finish,
484         .stop_streaming = sh_mobile_ceu_stop_streaming,
485 };
486 
487 static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
488 {
489         struct sh_mobile_ceu_dev *pcdev = data;
490         struct vb2_v4l2_buffer *vbuf;
491         int ret;
492 
493         spin_lock(&pcdev->lock);
494 
495         vbuf = pcdev->active;
496         if (!vbuf)
497                 /* Stale interrupt from a released buffer */
498                 goto out;
499 
500         list_del_init(&to_ceu_vb(vbuf)->queue);
501 
502         if (!list_empty(&pcdev->capture))
503                 pcdev->active = &list_entry(pcdev->capture.next,
504                                             struct sh_mobile_ceu_buffer, queue)->vb;
505         else
506                 pcdev->active = NULL;
507 
508         ret = sh_mobile_ceu_capture(pcdev);
509         vbuf->vb2_buf.timestamp = ktime_get_ns();
510         if (!ret) {
511                 vbuf->field = pcdev->field;
512                 vbuf->sequence = pcdev->sequence++;
513         }
514         vb2_buffer_done(&vbuf->vb2_buf,
515                         ret < 0 ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
516 
517 out:
518         spin_unlock(&pcdev->lock);
519 
520         return IRQ_HANDLED;
521 }
522 
523 static struct v4l2_subdev *find_csi2(struct sh_mobile_ceu_dev *pcdev)
524 {
525         struct v4l2_subdev *sd;
526 
527         if (pcdev->csi2_sd)
528                 return pcdev->csi2_sd;
529 
530         if (pcdev->csi2_asd) {
531                 char name[] = "sh-mobile-csi2";
532                 v4l2_device_for_each_subdev(sd, &pcdev->ici.v4l2_dev)
533                         if (!strncmp(name, sd->name, sizeof(name) - 1)) {
534                                 pcdev->csi2_sd = sd;
535                                 return sd;
536                         }
537         }
538 
539         return NULL;
540 }
541 
542 static struct v4l2_subdev *csi2_subdev(struct sh_mobile_ceu_dev *pcdev,
543                                        struct soc_camera_device *icd)
544 {
545         struct v4l2_subdev *sd = pcdev->csi2_sd;
546 
547         return sd && sd->grp_id == soc_camera_grp_id(icd) ? sd : NULL;
548 }
549 
550 static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
551 {
552         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
553         struct sh_mobile_ceu_dev *pcdev = ici->priv;
554         struct v4l2_subdev *csi2_sd = find_csi2(pcdev);
555         int ret;
556 
557         if (csi2_sd) {
558                 csi2_sd->grp_id = soc_camera_grp_id(icd);
559                 v4l2_set_subdev_hostdata(csi2_sd, icd);
560         }
561 
562         ret = v4l2_subdev_call(csi2_sd, core, s_power, 1);
563         if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
564                 return ret;
565 
566         /*
567          * -ENODEV is special: either csi2_sd == NULL or the CSI-2 driver
568          * has not found this soc-camera device among its clients
569          */
570         if (csi2_sd && ret == -ENODEV)
571                 csi2_sd->grp_id = 0;
572 
573         dev_info(icd->parent,
574                  "SuperH Mobile CEU%s driver attached to camera %d\n",
575                  csi2_sd && csi2_sd->grp_id ? "/CSI-2" : "", icd->devnum);
576 
577         return 0;
578 }
579 
580 static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
581 {
582         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
583         struct sh_mobile_ceu_dev *pcdev = ici->priv;
584         struct v4l2_subdev *csi2_sd = find_csi2(pcdev);
585 
586         dev_info(icd->parent,
587                  "SuperH Mobile CEU driver detached from camera %d\n",
588                  icd->devnum);
589 
590         v4l2_subdev_call(csi2_sd, core, s_power, 0);
591 }
592 
593 /* Called with .host_lock held */
594 static int sh_mobile_ceu_clock_start(struct soc_camera_host *ici)
595 {
596         struct sh_mobile_ceu_dev *pcdev = ici->priv;
597 
598         pm_runtime_get_sync(ici->v4l2_dev.dev);
599 
600         pcdev->buf_total = 0;
601 
602         sh_mobile_ceu_soft_reset(pcdev);
603 
604         return 0;
605 }
606 
607 /* Called with .host_lock held */
608 static void sh_mobile_ceu_clock_stop(struct soc_camera_host *ici)
609 {
610         struct sh_mobile_ceu_dev *pcdev = ici->priv;
611 
612         /* disable capture, disable interrupts */
613         ceu_write(pcdev, CEIER, 0);
614         sh_mobile_ceu_soft_reset(pcdev);
615 
616         /* make sure active buffer is canceled */
617         spin_lock_irq(&pcdev->lock);
618         if (pcdev->active) {
619                 list_del_init(&to_ceu_vb(pcdev->active)->queue);
620                 vb2_buffer_done(&pcdev->active->vb2_buf, VB2_BUF_STATE_ERROR);
621                 pcdev->active = NULL;
622         }
623         spin_unlock_irq(&pcdev->lock);
624 
625         pm_runtime_put(ici->v4l2_dev.dev);
626 }
627 
628 /*
629  * See chapter 29.4.12 "Capture Filter Control Register (CFLCR)"
630  * in SH7722 Hardware Manual
631  */
632 static unsigned int size_dst(unsigned int src, unsigned int scale)
633 {
634         unsigned int mant_pre = scale >> 12;
635         if (!src || !scale)
636                 return src;
637         return ((mant_pre + 2 * (src - 1)) / (2 * mant_pre) - 1) *
638                 mant_pre * 4096 / scale + 1;
639 }
640 
641 static u16 calc_scale(unsigned int src, unsigned int *dst)
642 {
643         u16 scale;
644 
645         if (src == *dst)
646                 return 0;
647 
648         scale = (src * 4096 / *dst) & ~7;
649 
650         while (scale > 4096 && size_dst(src, scale) < *dst)
651                 scale -= 8;
652 
653         *dst = size_dst(src, scale);
654 
655         return scale;
656 }
657 
658 /* rect is guaranteed to not exceed the scaled camera rectangle */
659 static void sh_mobile_ceu_set_rect(struct soc_camera_device *icd)
660 {
661         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
662         struct sh_mobile_ceu_cam *cam = icd->host_priv;
663         struct sh_mobile_ceu_dev *pcdev = ici->priv;
664         unsigned int height, width, cdwdr_width, in_width, in_height;
665         unsigned int left_offset, top_offset;
666         u32 camor;
667 
668         dev_geo(icd->parent, "Crop %ux%u@%u:%u\n",
669                 icd->user_width, icd->user_height, cam->ceu_left, cam->ceu_top);
670 
671         left_offset     = cam->ceu_left;
672         top_offset      = cam->ceu_top;
673 
674         WARN_ON(icd->user_width & 3 || icd->user_height & 3);
675 
676         width = icd->user_width;
677 
678         if (pcdev->image_mode) {
679                 in_width = cam->width;
680                 if (!pcdev->is_16bit) {
681                         in_width *= 2;
682                         left_offset *= 2;
683                 }
684         } else {
685                 unsigned int w_factor;
686 
687                 switch (icd->current_fmt->host_fmt->packing) {
688                 case SOC_MBUS_PACKING_2X8_PADHI:
689                         w_factor = 2;
690                         break;
691                 default:
692                         w_factor = 1;
693                 }
694 
695                 in_width = cam->width * w_factor;
696                 left_offset *= w_factor;
697         }
698 
699         cdwdr_width = icd->bytesperline;
700 
701         height = icd->user_height;
702         in_height = cam->height;
703         if (V4L2_FIELD_NONE != pcdev->field) {
704                 height = (height / 2) & ~3;
705                 in_height /= 2;
706                 top_offset /= 2;
707                 cdwdr_width *= 2;
708         }
709 
710         /* CSI2 special configuration */
711         if (csi2_subdev(pcdev, icd)) {
712                 in_width = ((in_width - 2) * 2);
713                 left_offset *= 2;
714         }
715 
716         /* Set CAMOR, CAPWR, CFSZR, take care of CDWDR */
717         camor = left_offset | (top_offset << 16);
718 
719         dev_geo(icd->parent,
720                 "CAMOR 0x%x, CAPWR 0x%x, CFSZR 0x%x, CDWDR 0x%x\n", camor,
721                 (in_height << 16) | in_width, (height << 16) | width,
722                 cdwdr_width);
723 
724         ceu_write(pcdev, CAMOR, camor);
725         ceu_write(pcdev, CAPWR, (in_height << 16) | in_width);
726         /* CFSZR clipping is applied _after_ the scaling filter (CFLCR) */
727         ceu_write(pcdev, CFSZR, (height << 16) | width);
728         ceu_write(pcdev, CDWDR, cdwdr_width);
729 }
730 
731 static u32 capture_save_reset(struct sh_mobile_ceu_dev *pcdev)
732 {
733         u32 capsr = ceu_read(pcdev, CAPSR);
734         ceu_write(pcdev, CAPSR, 1 << 16); /* reset, stop capture */
735         return capsr;
736 }
737 
738 static void capture_restore(struct sh_mobile_ceu_dev *pcdev, u32 capsr)
739 {
740         unsigned long timeout = jiffies + 10 * HZ;
741 
742         /*
743          * Wait until the end of the current frame. It can take a long time,
744          * but if it has been aborted by a CAPSR reset, it shoule exit sooner.
745          */
746         while ((ceu_read(pcdev, CSTSR) & 1) && time_before(jiffies, timeout))
747                 msleep(1);
748 
749         if (time_after(jiffies, timeout)) {
750                 dev_err(pcdev->ici.v4l2_dev.dev,
751                         "Timeout waiting for frame end! Interface problem?\n");
752                 return;
753         }
754 
755         /* Wait until reset clears, this shall not hang... */
756         while (ceu_read(pcdev, CAPSR) & (1 << 16))
757                 udelay(10);
758 
759         /* Anything to restore? */
760         if (capsr & ~(1 << 16))
761                 ceu_write(pcdev, CAPSR, capsr);
762 }
763 
764 /* Find the bus subdevice driver, e.g., CSI2 */
765 static struct v4l2_subdev *find_bus_subdev(struct sh_mobile_ceu_dev *pcdev,
766                                            struct soc_camera_device *icd)
767 {
768         return csi2_subdev(pcdev, icd) ? : soc_camera_to_subdev(icd);
769 }
770 
771 #define CEU_BUS_FLAGS (V4L2_MBUS_MASTER |       \
772                 V4L2_MBUS_PCLK_SAMPLE_RISING |  \
773                 V4L2_MBUS_HSYNC_ACTIVE_HIGH |   \
774                 V4L2_MBUS_HSYNC_ACTIVE_LOW |    \
775                 V4L2_MBUS_VSYNC_ACTIVE_HIGH |   \
776                 V4L2_MBUS_VSYNC_ACTIVE_LOW |    \
777                 V4L2_MBUS_DATA_ACTIVE_HIGH)
778 
779 /* Capture is not running, no interrupts, no locking needed */
780 static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd)
781 {
782         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
783         struct sh_mobile_ceu_dev *pcdev = ici->priv;
784         struct v4l2_subdev *sd = find_bus_subdev(pcdev, icd);
785         struct sh_mobile_ceu_cam *cam = icd->host_priv;
786         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
787         unsigned long value, common_flags = CEU_BUS_FLAGS;
788         u32 capsr = capture_save_reset(pcdev);
789         unsigned int yuv_lineskip;
790         int ret;
791 
792         /*
793          * If the client doesn't implement g_mbus_config, we just use our
794          * platform data
795          */
796         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
797         if (!ret) {
798                 common_flags = soc_mbus_config_compatible(&cfg,
799                                                           common_flags);
800                 if (!common_flags)
801                         return -EINVAL;
802         } else if (ret != -ENOIOCTLCMD) {
803                 return ret;
804         }
805 
806         /* Make choises, based on platform preferences */
807         if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
808             (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
809                 if (pcdev->flags & SH_CEU_FLAG_HSYNC_LOW)
810                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
811                 else
812                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
813         }
814 
815         if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
816             (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
817                 if (pcdev->flags & SH_CEU_FLAG_VSYNC_LOW)
818                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
819                 else
820                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
821         }
822 
823         cfg.flags = common_flags;
824         ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
825         if (ret < 0 && ret != -ENOIOCTLCMD)
826                 return ret;
827 
828         if (icd->current_fmt->host_fmt->bits_per_sample > 8)
829                 pcdev->is_16bit = 1;
830         else
831                 pcdev->is_16bit = 0;
832 
833         ceu_write(pcdev, CRCNTR, 0);
834         ceu_write(pcdev, CRCMPR, 0);
835 
836         value = 0x00000010; /* data fetch by default */
837         yuv_lineskip = 0x10;
838 
839         switch (icd->current_fmt->host_fmt->fourcc) {
840         case V4L2_PIX_FMT_NV12:
841         case V4L2_PIX_FMT_NV21:
842                 /* convert 4:2:2 -> 4:2:0 */
843                 yuv_lineskip = 0; /* skip for NV12/21, no skip for NV16/61 */
844                 /* fall-through */
845         case V4L2_PIX_FMT_NV16:
846         case V4L2_PIX_FMT_NV61:
847                 switch (cam->code) {
848                 case MEDIA_BUS_FMT_UYVY8_2X8:
849                         value = 0x00000000; /* Cb0, Y0, Cr0, Y1 */
850                         break;
851                 case MEDIA_BUS_FMT_VYUY8_2X8:
852                         value = 0x00000100; /* Cr0, Y0, Cb0, Y1 */
853                         break;
854                 case MEDIA_BUS_FMT_YUYV8_2X8:
855                         value = 0x00000200; /* Y0, Cb0, Y1, Cr0 */
856                         break;
857                 case MEDIA_BUS_FMT_YVYU8_2X8:
858                         value = 0x00000300; /* Y0, Cr0, Y1, Cb0 */
859                         break;
860                 default:
861                         BUG();
862                 }
863         }
864 
865         if (icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV21 ||
866             icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV61)
867                 value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */
868 
869         value |= common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
870         value |= common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
871 
872         if (csi2_subdev(pcdev, icd)) /* CSI2 mode */
873                 value |= 3 << 12;
874         else if (pcdev->is_16bit)
875                 value |= 1 << 12;
876         else if (pcdev->flags & SH_CEU_FLAG_LOWER_8BIT)
877                 value |= 2 << 12;
878 
879         ceu_write(pcdev, CAMCR, value);
880 
881         ceu_write(pcdev, CAPCR, 0x00300000);
882 
883         switch (pcdev->field) {
884         case V4L2_FIELD_INTERLACED_TB:
885                 value = 0x101;
886                 break;
887         case V4L2_FIELD_INTERLACED_BT:
888                 value = 0x102;
889                 break;
890         default:
891                 value = 0;
892                 break;
893         }
894         ceu_write(pcdev, CAIFR, value);
895 
896         sh_mobile_ceu_set_rect(icd);
897         mdelay(1);
898 
899         dev_geo(icd->parent, "CFLCR 0x%x\n", pcdev->cflcr);
900         ceu_write(pcdev, CFLCR, pcdev->cflcr);
901 
902         /*
903          * A few words about byte order (observed in Big Endian mode)
904          *
905          * In data fetch mode bytes are received in chunks of 8 bytes.
906          * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
907          *
908          * The data is however by default written to memory in reverse order:
909          * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
910          *
911          * The lowest three bits of CDOCR allows us to do swapping,
912          * using 7 we swap the data bytes to match the incoming order:
913          * D0, D1, D2, D3, D4, D5, D6, D7
914          */
915         value = 0x00000007 | yuv_lineskip;
916 
917         ceu_write(pcdev, CDOCR, value);
918         ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
919 
920         capture_restore(pcdev, capsr);
921 
922         /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
923         return 0;
924 }
925 
926 static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd,
927                                        unsigned char buswidth)
928 {
929         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
930         struct sh_mobile_ceu_dev *pcdev = ici->priv;
931         struct v4l2_subdev *sd = find_bus_subdev(pcdev, icd);
932         unsigned long common_flags = CEU_BUS_FLAGS;
933         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
934         int ret;
935 
936         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
937         if (!ret)
938                 common_flags = soc_mbus_config_compatible(&cfg,
939                                                           common_flags);
940         else if (ret != -ENOIOCTLCMD)
941                 return ret;
942 
943         if (!common_flags || buswidth > 16)
944                 return -EINVAL;
945 
946         return 0;
947 }
948 
949 static const struct soc_mbus_pixelfmt sh_mobile_ceu_formats[] = {
950         {
951                 .fourcc                 = V4L2_PIX_FMT_NV12,
952                 .name                   = "NV12",
953                 .bits_per_sample        = 8,
954                 .packing                = SOC_MBUS_PACKING_1_5X8,
955                 .order                  = SOC_MBUS_ORDER_LE,
956                 .layout                 = SOC_MBUS_LAYOUT_PLANAR_2Y_C,
957         }, {
958                 .fourcc                 = V4L2_PIX_FMT_NV21,
959                 .name                   = "NV21",
960                 .bits_per_sample        = 8,
961                 .packing                = SOC_MBUS_PACKING_1_5X8,
962                 .order                  = SOC_MBUS_ORDER_LE,
963                 .layout                 = SOC_MBUS_LAYOUT_PLANAR_2Y_C,
964         }, {
965                 .fourcc                 = V4L2_PIX_FMT_NV16,
966                 .name                   = "NV16",
967                 .bits_per_sample        = 8,
968                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
969                 .order                  = SOC_MBUS_ORDER_LE,
970                 .layout                 = SOC_MBUS_LAYOUT_PLANAR_Y_C,
971         }, {
972                 .fourcc                 = V4L2_PIX_FMT_NV61,
973                 .name                   = "NV61",
974                 .bits_per_sample        = 8,
975                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
976                 .order                  = SOC_MBUS_ORDER_LE,
977                 .layout                 = SOC_MBUS_LAYOUT_PLANAR_Y_C,
978         },
979 };
980 
981 /* This will be corrected as we get more formats */
982 static bool sh_mobile_ceu_packing_supported(const struct soc_mbus_pixelfmt *fmt)
983 {
984         return  fmt->packing == SOC_MBUS_PACKING_NONE ||
985                 (fmt->bits_per_sample == 8 &&
986                  fmt->packing == SOC_MBUS_PACKING_1_5X8) ||
987                 (fmt->bits_per_sample == 8 &&
988                  fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
989                 (fmt->bits_per_sample > 8 &&
990                  fmt->packing == SOC_MBUS_PACKING_EXTEND16);
991 }
992 
993 static struct soc_camera_device *ctrl_to_icd(struct v4l2_ctrl *ctrl)
994 {
995         return container_of(ctrl->handler, struct soc_camera_device,
996                                                         ctrl_handler);
997 }
998 
999 static int sh_mobile_ceu_s_ctrl(struct v4l2_ctrl *ctrl)
1000 {
1001         struct soc_camera_device *icd = ctrl_to_icd(ctrl);
1002         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1003         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1004 
1005         switch (ctrl->id) {
1006         case V4L2_CID_SHARPNESS:
1007                 switch (icd->current_fmt->host_fmt->fourcc) {
1008                 case V4L2_PIX_FMT_NV12:
1009                 case V4L2_PIX_FMT_NV21:
1010                 case V4L2_PIX_FMT_NV16:
1011                 case V4L2_PIX_FMT_NV61:
1012                         ceu_write(pcdev, CLFCR, !ctrl->val);
1013                         return 0;
1014                 }
1015                 break;
1016         }
1017 
1018         return -EINVAL;
1019 }
1020 
1021 static const struct v4l2_ctrl_ops sh_mobile_ceu_ctrl_ops = {
1022         .s_ctrl = sh_mobile_ceu_s_ctrl,
1023 };
1024 
1025 static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, unsigned int idx,
1026                                      struct soc_camera_format_xlate *xlate)
1027 {
1028         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1029         struct device *dev = icd->parent;
1030         struct soc_camera_host *ici = to_soc_camera_host(dev);
1031         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1032         int ret, k, n;
1033         int formats = 0;
1034         struct sh_mobile_ceu_cam *cam;
1035         struct v4l2_subdev_mbus_code_enum code = {
1036                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1037                 .index = idx,
1038         };
1039         const struct soc_mbus_pixelfmt *fmt;
1040 
1041         ret = v4l2_subdev_call(sd, pad, enum_mbus_code, NULL, &code);
1042         if (ret < 0)
1043                 /* No more formats */
1044                 return 0;
1045 
1046         fmt = soc_mbus_get_fmtdesc(code.code);
1047         if (!fmt) {
1048                 dev_warn(dev, "unsupported format code #%u: %d\n", idx, code.code);
1049                 return 0;
1050         }
1051 
1052         if (!csi2_subdev(pcdev, icd)) {
1053                 /* Are there any restrictions in the CSI-2 case? */
1054                 ret = sh_mobile_ceu_try_bus_param(icd, fmt->bits_per_sample);
1055                 if (ret < 0)
1056                         return 0;
1057         }
1058 
1059         if (!icd->host_priv) {
1060                 struct v4l2_subdev_format fmt = {
1061                         .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1062                 };
1063                 struct v4l2_mbus_framefmt *mf = &fmt.format;
1064                 struct v4l2_rect rect;
1065                 int shift = 0;
1066 
1067                 /* Add our control */
1068                 v4l2_ctrl_new_std(&icd->ctrl_handler, &sh_mobile_ceu_ctrl_ops,
1069                                   V4L2_CID_SHARPNESS, 0, 1, 1, 1);
1070                 if (icd->ctrl_handler.error)
1071                         return icd->ctrl_handler.error;
1072 
1073                 /* FIXME: subwindow is lost between close / open */
1074 
1075                 /* Cache current client geometry */
1076                 ret = soc_camera_client_g_rect(sd, &rect);
1077                 if (ret < 0)
1078                         return ret;
1079 
1080                 /* First time */
1081                 ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &fmt);
1082                 if (ret < 0)
1083                         return ret;
1084 
1085                 /*
1086                  * All currently existing CEU implementations support 2560x1920
1087                  * or larger frames. If the sensor is proposing too big a frame,
1088                  * don't bother with possibly supportred by the CEU larger
1089                  * sizes, just try VGA multiples. If needed, this can be
1090                  * adjusted in the future.
1091                  */
1092                 while ((mf->width > pcdev->max_width ||
1093                         mf->height > pcdev->max_height) && shift < 4) {
1094                         /* Try 2560x1920, 1280x960, 640x480, 320x240 */
1095                         mf->width       = 2560 >> shift;
1096                         mf->height      = 1920 >> shift;
1097                         ret = v4l2_device_call_until_err(sd->v4l2_dev,
1098                                         soc_camera_grp_id(icd), pad,
1099                                         set_fmt, NULL, &fmt);
1100                         if (ret < 0)
1101                                 return ret;
1102                         shift++;
1103                 }
1104 
1105                 if (shift == 4) {
1106                         dev_err(dev, "Failed to configure the client below %ux%x\n",
1107                                 mf->width, mf->height);
1108                         return -EIO;
1109                 }
1110 
1111                 dev_geo(dev, "camera fmt %ux%u\n", mf->width, mf->height);
1112 
1113                 cam = kzalloc(sizeof(*cam), GFP_KERNEL);
1114                 if (!cam)
1115                         return -ENOMEM;
1116 
1117                 /* We are called with current camera crop, initialise subrect with it */
1118                 cam->rect       = rect;
1119                 cam->subrect    = rect;
1120 
1121                 cam->width      = mf->width;
1122                 cam->height     = mf->height;
1123 
1124                 icd->host_priv = cam;
1125         } else {
1126                 cam = icd->host_priv;
1127         }
1128 
1129         /* Beginning of a pass */
1130         if (!idx)
1131                 cam->extra_fmt = NULL;
1132 
1133         switch (code.code) {
1134         case MEDIA_BUS_FMT_UYVY8_2X8:
1135         case MEDIA_BUS_FMT_VYUY8_2X8:
1136         case MEDIA_BUS_FMT_YUYV8_2X8:
1137         case MEDIA_BUS_FMT_YVYU8_2X8:
1138                 if (cam->extra_fmt)
1139                         break;
1140 
1141                 /*
1142                  * Our case is simple so far: for any of the above four camera
1143                  * formats we add all our four synthesized NV* formats, so,
1144                  * just marking the device with a single flag suffices. If
1145                  * the format generation rules are more complex, you would have
1146                  * to actually hang your already added / counted formats onto
1147                  * the host_priv pointer and check whether the format you're
1148                  * going to add now is already there.
1149                  */
1150                 cam->extra_fmt = sh_mobile_ceu_formats;
1151 
1152                 n = ARRAY_SIZE(sh_mobile_ceu_formats);
1153                 formats += n;
1154                 for (k = 0; xlate && k < n; k++) {
1155                         xlate->host_fmt = &sh_mobile_ceu_formats[k];
1156                         xlate->code     = code.code;
1157                         xlate++;
1158                         dev_dbg(dev, "Providing format %s using code %d\n",
1159                                 sh_mobile_ceu_formats[k].name, code.code);
1160                 }
1161                 break;
1162         default:
1163                 if (!sh_mobile_ceu_packing_supported(fmt))
1164                         return 0;
1165         }
1166 
1167         /* Generic pass-through */
1168         formats++;
1169         if (xlate) {
1170                 xlate->host_fmt = fmt;
1171                 xlate->code     = code.code;
1172                 xlate++;
1173                 dev_dbg(dev, "Providing format %s in pass-through mode\n",
1174                         fmt->name);
1175         }
1176 
1177         return formats;
1178 }
1179 
1180 static void sh_mobile_ceu_put_formats(struct soc_camera_device *icd)
1181 {
1182         kfree(icd->host_priv);
1183         icd->host_priv = NULL;
1184 }
1185 
1186 #define scale_down(size, scale) soc_camera_shift_scale(size, 12, scale)
1187 #define calc_generic_scale(in, out) soc_camera_calc_scale(in, 12, out)
1188 
1189 /*
1190  * CEU can scale and crop, but we don't want to waste bandwidth and kill the
1191  * framerate by always requesting the maximum image from the client. See
1192  * Documentation/video4linux/sh_mobile_ceu_camera.txt for a description of
1193  * scaling and cropping algorithms and for the meaning of referenced here steps.
1194  */
1195 static int sh_mobile_ceu_set_crop(struct soc_camera_device *icd,
1196                                   const struct v4l2_crop *a)
1197 {
1198         struct v4l2_crop a_writable = *a;
1199         const struct v4l2_rect *rect = &a_writable.c;
1200         struct device *dev = icd->parent;
1201         struct soc_camera_host *ici = to_soc_camera_host(dev);
1202         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1203         struct v4l2_crop cam_crop;
1204         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1205         struct v4l2_rect *cam_rect = &cam_crop.c;
1206         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1207         struct v4l2_subdev_format fmt = {
1208                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1209         };
1210         struct v4l2_mbus_framefmt *mf = &fmt.format;
1211         unsigned int scale_cam_h, scale_cam_v, scale_ceu_h, scale_ceu_v,
1212                 out_width, out_height;
1213         int interm_width, interm_height;
1214         u32 capsr, cflcr;
1215         int ret;
1216 
1217         dev_geo(dev, "S_CROP(%ux%u@%u:%u)\n", rect->width, rect->height,
1218                 rect->left, rect->top);
1219 
1220         /* During camera cropping its output window can change too, stop CEU */
1221         capsr = capture_save_reset(pcdev);
1222         dev_dbg(dev, "CAPSR 0x%x, CFLCR 0x%x\n", capsr, pcdev->cflcr);
1223 
1224         /*
1225          * 1. - 2. Apply iterative camera S_CROP for new input window, read back
1226          * actual camera rectangle.
1227          */
1228         ret = soc_camera_client_s_crop(sd, &a_writable, &cam_crop,
1229                                        &cam->rect, &cam->subrect);
1230         if (ret < 0)
1231                 return ret;
1232 
1233         dev_geo(dev, "1-2: camera cropped to %ux%u@%u:%u\n",
1234                 cam_rect->width, cam_rect->height,
1235                 cam_rect->left, cam_rect->top);
1236 
1237         /* On success cam_crop contains current camera crop */
1238 
1239         /* 3. Retrieve camera output window */
1240         ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &fmt);
1241         if (ret < 0)
1242                 return ret;
1243 
1244         if (mf->width > pcdev->max_width || mf->height > pcdev->max_height)
1245                 return -EINVAL;
1246 
1247         /* 4. Calculate camera scales */
1248         scale_cam_h     = calc_generic_scale(cam_rect->width, mf->width);
1249         scale_cam_v     = calc_generic_scale(cam_rect->height, mf->height);
1250 
1251         /* Calculate intermediate window */
1252         interm_width    = scale_down(rect->width, scale_cam_h);
1253         interm_height   = scale_down(rect->height, scale_cam_v);
1254 
1255         if (interm_width < icd->user_width) {
1256                 u32 new_scale_h;
1257 
1258                 new_scale_h = calc_generic_scale(rect->width, icd->user_width);
1259 
1260                 mf->width = scale_down(cam_rect->width, new_scale_h);
1261         }
1262 
1263         if (interm_height < icd->user_height) {
1264                 u32 new_scale_v;
1265 
1266                 new_scale_v = calc_generic_scale(rect->height, icd->user_height);
1267 
1268                 mf->height = scale_down(cam_rect->height, new_scale_v);
1269         }
1270 
1271         if (interm_width < icd->user_width || interm_height < icd->user_height) {
1272                 ret = v4l2_device_call_until_err(sd->v4l2_dev,
1273                                         soc_camera_grp_id(icd), pad,
1274                                         set_fmt, NULL, &fmt);
1275                 if (ret < 0)
1276                         return ret;
1277 
1278                 dev_geo(dev, "New camera output %ux%u\n", mf->width, mf->height);
1279                 scale_cam_h     = calc_generic_scale(cam_rect->width, mf->width);
1280                 scale_cam_v     = calc_generic_scale(cam_rect->height, mf->height);
1281                 interm_width    = scale_down(rect->width, scale_cam_h);
1282                 interm_height   = scale_down(rect->height, scale_cam_v);
1283         }
1284 
1285         /* Cache camera output window */
1286         cam->width      = mf->width;
1287         cam->height     = mf->height;
1288 
1289         if (pcdev->image_mode) {
1290                 out_width       = min(interm_width, icd->user_width);
1291                 out_height      = min(interm_height, icd->user_height);
1292         } else {
1293                 out_width       = interm_width;
1294                 out_height      = interm_height;
1295         }
1296 
1297         /*
1298          * 5. Calculate CEU scales from camera scales from results of (5) and
1299          *    the user window
1300          */
1301         scale_ceu_h     = calc_scale(interm_width, &out_width);
1302         scale_ceu_v     = calc_scale(interm_height, &out_height);
1303 
1304         dev_geo(dev, "5: CEU scales %u:%u\n", scale_ceu_h, scale_ceu_v);
1305 
1306         /* Apply CEU scales. */
1307         cflcr = scale_ceu_h | (scale_ceu_v << 16);
1308         if (cflcr != pcdev->cflcr) {
1309                 pcdev->cflcr = cflcr;
1310                 ceu_write(pcdev, CFLCR, cflcr);
1311         }
1312 
1313         icd->user_width  = out_width & ~3;
1314         icd->user_height = out_height & ~3;
1315         /* Offsets are applied at the CEU scaling filter input */
1316         cam->ceu_left    = scale_down(rect->left - cam_rect->left, scale_cam_h) & ~1;
1317         cam->ceu_top     = scale_down(rect->top - cam_rect->top, scale_cam_v) & ~1;
1318 
1319         /* 6. Use CEU cropping to crop to the new window. */
1320         sh_mobile_ceu_set_rect(icd);
1321 
1322         cam->subrect = *rect;
1323 
1324         dev_geo(dev, "6: CEU cropped to %ux%u@%u:%u\n",
1325                 icd->user_width, icd->user_height,
1326                 cam->ceu_left, cam->ceu_top);
1327 
1328         /* Restore capture. The CE bit can be cleared by the hardware */
1329         if (pcdev->active)
1330                 capsr |= 1;
1331         capture_restore(pcdev, capsr);
1332 
1333         /* Even if only camera cropping succeeded */
1334         return ret;
1335 }
1336 
1337 static int sh_mobile_ceu_get_crop(struct soc_camera_device *icd,
1338                                   struct v4l2_crop *a)
1339 {
1340         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1341 
1342         a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1343         a->c = cam->subrect;
1344 
1345         return 0;
1346 }
1347 
1348 /* Similar to set_crop multistage iterative algorithm */
1349 static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
1350                                  struct v4l2_format *f)
1351 {
1352         struct device *dev = icd->parent;
1353         struct soc_camera_host *ici = to_soc_camera_host(dev);
1354         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1355         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1356         struct v4l2_pix_format *pix = &f->fmt.pix;
1357         struct v4l2_mbus_framefmt mf;
1358         __u32 pixfmt = pix->pixelformat;
1359         const struct soc_camera_format_xlate *xlate;
1360         unsigned int ceu_sub_width = pcdev->max_width,
1361                 ceu_sub_height = pcdev->max_height;
1362         u16 scale_v, scale_h;
1363         int ret;
1364         bool image_mode;
1365         enum v4l2_field field;
1366 
1367         switch (pix->field) {
1368         default:
1369                 pix->field = V4L2_FIELD_NONE;
1370                 /* fall-through */
1371         case V4L2_FIELD_INTERLACED_TB:
1372         case V4L2_FIELD_INTERLACED_BT:
1373         case V4L2_FIELD_NONE:
1374                 field = pix->field;
1375                 break;
1376         case V4L2_FIELD_INTERLACED:
1377                 field = V4L2_FIELD_INTERLACED_TB;
1378                 break;
1379         }
1380 
1381         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1382         if (!xlate) {
1383                 dev_warn(dev, "Format %x not found\n", pixfmt);
1384                 return -EINVAL;
1385         }
1386 
1387         /* 1.-4. Calculate desired client output geometry */
1388         soc_camera_calc_client_output(icd, &cam->rect, &cam->subrect, pix, &mf, 12);
1389         mf.field        = pix->field;
1390         mf.colorspace   = pix->colorspace;
1391         mf.code         = xlate->code;
1392 
1393         switch (pixfmt) {
1394         case V4L2_PIX_FMT_NV12:
1395         case V4L2_PIX_FMT_NV21:
1396         case V4L2_PIX_FMT_NV16:
1397         case V4L2_PIX_FMT_NV61:
1398                 image_mode = true;
1399                 break;
1400         default:
1401                 image_mode = false;
1402         }
1403 
1404         dev_geo(dev, "S_FMT(pix=0x%x, fld 0x%x, code 0x%x, %ux%u)\n", pixfmt, mf.field, mf.code,
1405                 pix->width, pix->height);
1406 
1407         dev_geo(dev, "4: request camera output %ux%u\n", mf.width, mf.height);
1408 
1409         /* 5. - 9. */
1410         ret = soc_camera_client_scale(icd, &cam->rect, &cam->subrect,
1411                                 &mf, &ceu_sub_width, &ceu_sub_height,
1412                                 image_mode && V4L2_FIELD_NONE == field, 12);
1413 
1414         dev_geo(dev, "5-9: client scale return %d\n", ret);
1415 
1416         /* Done with the camera. Now see if we can improve the result */
1417 
1418         dev_geo(dev, "fmt %ux%u, requested %ux%u\n",
1419                 mf.width, mf.height, pix->width, pix->height);
1420         if (ret < 0)
1421                 return ret;
1422 
1423         if (mf.code != xlate->code)
1424                 return -EINVAL;
1425 
1426         /* 9. Prepare CEU crop */
1427         cam->width = mf.width;
1428         cam->height = mf.height;
1429 
1430         /* 10. Use CEU scaling to scale to the requested user window. */
1431 
1432         /* We cannot scale up */
1433         if (pix->width > ceu_sub_width)
1434                 ceu_sub_width = pix->width;
1435 
1436         if (pix->height > ceu_sub_height)
1437                 ceu_sub_height = pix->height;
1438 
1439         pix->colorspace = mf.colorspace;
1440 
1441         if (image_mode) {
1442                 /* Scale pix->{width x height} down to width x height */
1443                 scale_h         = calc_scale(ceu_sub_width, &pix->width);
1444                 scale_v         = calc_scale(ceu_sub_height, &pix->height);
1445         } else {
1446                 pix->width      = ceu_sub_width;
1447                 pix->height     = ceu_sub_height;
1448                 scale_h         = 0;
1449                 scale_v         = 0;
1450         }
1451 
1452         pcdev->cflcr = scale_h | (scale_v << 16);
1453 
1454         /*
1455          * We have calculated CFLCR, the actual configuration will be performed
1456          * in sh_mobile_ceu_set_bus_param()
1457          */
1458 
1459         dev_geo(dev, "10: W: %u : 0x%x = %u, H: %u : 0x%x = %u\n",
1460                 ceu_sub_width, scale_h, pix->width,
1461                 ceu_sub_height, scale_v, pix->height);
1462 
1463         cam->code               = xlate->code;
1464         icd->current_fmt        = xlate;
1465 
1466         pcdev->field = field;
1467         pcdev->image_mode = image_mode;
1468 
1469         /* CFSZR requirement */
1470         pix->width      &= ~3;
1471         pix->height     &= ~3;
1472 
1473         return 0;
1474 }
1475 
1476 #define CEU_CHDW_MAX    8188U   /* Maximum line stride */
1477 
1478 static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
1479                                  struct v4l2_format *f)
1480 {
1481         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1482         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1483         const struct soc_camera_format_xlate *xlate;
1484         struct v4l2_pix_format *pix = &f->fmt.pix;
1485         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1486         struct v4l2_subdev_pad_config pad_cfg;
1487         struct v4l2_subdev_format format = {
1488                 .which = V4L2_SUBDEV_FORMAT_TRY,
1489         };
1490         struct v4l2_mbus_framefmt *mf = &format.format;
1491         __u32 pixfmt = pix->pixelformat;
1492         int width, height;
1493         int ret;
1494 
1495         dev_geo(icd->parent, "TRY_FMT(pix=0x%x, %ux%u)\n",
1496                  pixfmt, pix->width, pix->height);
1497 
1498         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1499         if (!xlate) {
1500                 xlate = icd->current_fmt;
1501                 dev_dbg(icd->parent, "Format %x not found, keeping %x\n",
1502                         pixfmt, xlate->host_fmt->fourcc);
1503                 pixfmt = xlate->host_fmt->fourcc;
1504                 pix->pixelformat = pixfmt;
1505                 pix->colorspace = icd->colorspace;
1506         }
1507 
1508         /* FIXME: calculate using depth and bus width */
1509 
1510         /* CFSZR requires height and width to be 4-pixel aligned */
1511         v4l_bound_align_image(&pix->width, 2, pcdev->max_width, 2,
1512                               &pix->height, 4, pcdev->max_height, 2, 0);
1513 
1514         width = pix->width;
1515         height = pix->height;
1516 
1517         /* limit to sensor capabilities */
1518         mf->width       = pix->width;
1519         mf->height      = pix->height;
1520         mf->field       = pix->field;
1521         mf->code        = xlate->code;
1522         mf->colorspace  = pix->colorspace;
1523 
1524         ret = v4l2_device_call_until_err(sd->v4l2_dev, soc_camera_grp_id(icd),
1525                                          pad, set_fmt, &pad_cfg, &format);
1526         if (ret < 0)
1527                 return ret;
1528 
1529         pix->width      = mf->width;
1530         pix->height     = mf->height;
1531         pix->field      = mf->field;
1532         pix->colorspace = mf->colorspace;
1533 
1534         switch (pixfmt) {
1535         case V4L2_PIX_FMT_NV12:
1536         case V4L2_PIX_FMT_NV21:
1537         case V4L2_PIX_FMT_NV16:
1538         case V4L2_PIX_FMT_NV61:
1539                 /* FIXME: check against rect_max after converting soc-camera */
1540                 /* We can scale precisely, need a bigger image from camera */
1541                 if (pix->width < width || pix->height < height) {
1542                         /*
1543                          * We presume, the sensor behaves sanely, i.e., if
1544                          * requested a bigger rectangle, it will not return a
1545                          * smaller one.
1546                          */
1547                         mf->width = pcdev->max_width;
1548                         mf->height = pcdev->max_height;
1549                         ret = v4l2_device_call_until_err(sd->v4l2_dev,
1550                                         soc_camera_grp_id(icd), pad,
1551                                         set_fmt, &pad_cfg, &format);
1552                         if (ret < 0) {
1553                                 /* Shouldn't actually happen... */
1554                                 dev_err(icd->parent,
1555                                         "FIXME: client try_fmt() = %d\n", ret);
1556                                 return ret;
1557                         }
1558                 }
1559                 /* We will scale exactly */
1560                 if (mf->width > width)
1561                         pix->width = width;
1562                 if (mf->height > height)
1563                         pix->height = height;
1564 
1565                 pix->bytesperline = max(pix->bytesperline, pix->width);
1566                 pix->bytesperline = min(pix->bytesperline, CEU_CHDW_MAX);
1567                 pix->bytesperline &= ~3;
1568                 break;
1569 
1570         default:
1571                 /* Configurable stride isn't supported in pass-through mode. */
1572                 pix->bytesperline  = 0;
1573         }
1574 
1575         pix->width      &= ~3;
1576         pix->height     &= ~3;
1577         pix->sizeimage  = 0;
1578 
1579         dev_geo(icd->parent, "%s(): return %d, fmt 0x%x, %ux%u\n",
1580                 __func__, ret, pix->pixelformat, pix->width, pix->height);
1581 
1582         return ret;
1583 }
1584 
1585 static int sh_mobile_ceu_set_livecrop(struct soc_camera_device *icd,
1586                                       const struct v4l2_crop *a)
1587 {
1588         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1589         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1590         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1591         u32 out_width = icd->user_width, out_height = icd->user_height;
1592         int ret;
1593 
1594         /* Freeze queue */
1595         pcdev->frozen = 1;
1596         /* Wait for frame */
1597         ret = wait_for_completion_interruptible(&pcdev->complete);
1598         /* Stop the client */
1599         ret = v4l2_subdev_call(sd, video, s_stream, 0);
1600         if (ret < 0)
1601                 dev_warn(icd->parent,
1602                          "Client failed to stop the stream: %d\n", ret);
1603         else
1604                 /* Do the crop, if it fails, there's nothing more we can do */
1605                 sh_mobile_ceu_set_crop(icd, a);
1606 
1607         dev_geo(icd->parent, "Output after crop: %ux%u\n", icd->user_width, icd->user_height);
1608 
1609         if (icd->user_width != out_width || icd->user_height != out_height) {
1610                 struct v4l2_format f = {
1611                         .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1612                         .fmt.pix        = {
1613                                 .width          = out_width,
1614                                 .height         = out_height,
1615                                 .pixelformat    = icd->current_fmt->host_fmt->fourcc,
1616                                 .field          = pcdev->field,
1617                                 .colorspace     = icd->colorspace,
1618                         },
1619                 };
1620                 ret = sh_mobile_ceu_set_fmt(icd, &f);
1621                 if (!ret && (out_width != f.fmt.pix.width ||
1622                              out_height != f.fmt.pix.height))
1623                         ret = -EINVAL;
1624                 if (!ret) {
1625                         icd->user_width         = out_width & ~3;
1626                         icd->user_height        = out_height & ~3;
1627                         ret = sh_mobile_ceu_set_bus_param(icd);
1628                 }
1629         }
1630 
1631         /* Thaw the queue */
1632         pcdev->frozen = 0;
1633         spin_lock_irq(&pcdev->lock);
1634         sh_mobile_ceu_capture(pcdev);
1635         spin_unlock_irq(&pcdev->lock);
1636         /* Start the client */
1637         ret = v4l2_subdev_call(sd, video, s_stream, 1);
1638         return ret;
1639 }
1640 
1641 static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
1642 {
1643         struct soc_camera_device *icd = file->private_data;
1644 
1645         return vb2_poll(&icd->vb2_vidq, file, pt);
1646 }
1647 
1648 static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
1649                                   struct v4l2_capability *cap)
1650 {
1651         strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
1652         strlcpy(cap->driver, "sh_mobile_ceu", sizeof(cap->driver));
1653         strlcpy(cap->bus_info, "platform:sh_mobile_ceu", sizeof(cap->bus_info));
1654         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1655         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1656 
1657         return 0;
1658 }
1659 
1660 static int sh_mobile_ceu_init_videobuf(struct vb2_queue *q,
1661                                        struct soc_camera_device *icd)
1662 {
1663         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1664 
1665         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1666         q->io_modes = VB2_MMAP | VB2_USERPTR;
1667         q->drv_priv = icd;
1668         q->ops = &sh_mobile_ceu_videobuf_ops;
1669         q->mem_ops = &vb2_dma_contig_memops;
1670         q->buf_struct_size = sizeof(struct sh_mobile_ceu_buffer);
1671         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1672         q->lock = &ici->host_lock;
1673 
1674         return vb2_queue_init(q);
1675 }
1676 
1677 static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
1678         .owner          = THIS_MODULE,
1679         .add            = sh_mobile_ceu_add_device,
1680         .remove         = sh_mobile_ceu_remove_device,
1681         .clock_start    = sh_mobile_ceu_clock_start,
1682         .clock_stop     = sh_mobile_ceu_clock_stop,
1683         .get_formats    = sh_mobile_ceu_get_formats,
1684         .put_formats    = sh_mobile_ceu_put_formats,
1685         .get_crop       = sh_mobile_ceu_get_crop,
1686         .set_crop       = sh_mobile_ceu_set_crop,
1687         .set_livecrop   = sh_mobile_ceu_set_livecrop,
1688         .set_fmt        = sh_mobile_ceu_set_fmt,
1689         .try_fmt        = sh_mobile_ceu_try_fmt,
1690         .poll           = sh_mobile_ceu_poll,
1691         .querycap       = sh_mobile_ceu_querycap,
1692         .set_bus_param  = sh_mobile_ceu_set_bus_param,
1693         .init_videobuf2 = sh_mobile_ceu_init_videobuf,
1694 };
1695 
1696 struct bus_wait {
1697         struct notifier_block   notifier;
1698         struct completion       completion;
1699         struct device           *dev;
1700 };
1701 
1702 static int bus_notify(struct notifier_block *nb,
1703                       unsigned long action, void *data)
1704 {
1705         struct device *dev = data;
1706         struct bus_wait *wait = container_of(nb, struct bus_wait, notifier);
1707 
1708         if (wait->dev != dev)
1709                 return NOTIFY_DONE;
1710 
1711         switch (action) {
1712         case BUS_NOTIFY_UNBOUND_DRIVER:
1713                 /* Protect from module unloading */
1714                 wait_for_completion(&wait->completion);
1715                 return NOTIFY_OK;
1716         }
1717         return NOTIFY_DONE;
1718 }
1719 
1720 static int sh_mobile_ceu_probe(struct platform_device *pdev)
1721 {
1722         struct sh_mobile_ceu_dev *pcdev;
1723         struct resource *res;
1724         void __iomem *base;
1725         unsigned int irq;
1726         int err, i;
1727         struct bus_wait wait = {
1728                 .completion = COMPLETION_INITIALIZER_ONSTACK(wait.completion),
1729                 .notifier.notifier_call = bus_notify,
1730         };
1731         struct sh_mobile_ceu_companion *csi2;
1732 
1733         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1734         irq = platform_get_irq(pdev, 0);
1735         if (!res || (int)irq <= 0) {
1736                 dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
1737                 return -ENODEV;
1738         }
1739 
1740         pcdev = devm_kzalloc(&pdev->dev, sizeof(*pcdev), GFP_KERNEL);
1741         if (!pcdev) {
1742                 dev_err(&pdev->dev, "Could not allocate pcdev\n");
1743                 return -ENOMEM;
1744         }
1745 
1746         INIT_LIST_HEAD(&pcdev->capture);
1747         spin_lock_init(&pcdev->lock);
1748         init_completion(&pcdev->complete);
1749 
1750         pcdev->pdata = pdev->dev.platform_data;
1751         if (!pcdev->pdata && !pdev->dev.of_node) {
1752                 dev_err(&pdev->dev, "CEU platform data not set.\n");
1753                 return -EINVAL;
1754         }
1755 
1756         /* TODO: implement per-device bus flags */
1757         if (pcdev->pdata) {
1758                 pcdev->max_width = pcdev->pdata->max_width;
1759                 pcdev->max_height = pcdev->pdata->max_height;
1760                 pcdev->flags = pcdev->pdata->flags;
1761         }
1762         pcdev->field = V4L2_FIELD_NONE;
1763 
1764         if (!pcdev->max_width) {
1765                 unsigned int v;
1766                 err = of_property_read_u32(pdev->dev.of_node, "renesas,max-width", &v);
1767                 if (!err)
1768                         pcdev->max_width = v;
1769 
1770                 if (!pcdev->max_width)
1771                         pcdev->max_width = 2560;
1772         }
1773         if (!pcdev->max_height) {
1774                 unsigned int v;
1775                 err = of_property_read_u32(pdev->dev.of_node, "renesas,max-height", &v);
1776                 if (!err)
1777                         pcdev->max_height = v;
1778 
1779                 if (!pcdev->max_height)
1780                         pcdev->max_height = 1920;
1781         }
1782 
1783         base = devm_ioremap_resource(&pdev->dev, res);
1784         if (IS_ERR(base))
1785                 return PTR_ERR(base);
1786 
1787         pcdev->irq = irq;
1788         pcdev->base = base;
1789         pcdev->video_limit = 0; /* only enabled if second resource exists */
1790 
1791         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1792         if (res) {
1793                 err = dma_declare_coherent_memory(&pdev->dev, res->start,
1794                                                   res->start,
1795                                                   resource_size(res),
1796                                                   DMA_MEMORY_MAP |
1797                                                   DMA_MEMORY_EXCLUSIVE);
1798                 if (!err) {
1799                         dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
1800                         return -ENXIO;
1801                 }
1802 
1803                 pcdev->video_limit = resource_size(res);
1804         }
1805 
1806         /* request irq */
1807         err = devm_request_irq(&pdev->dev, pcdev->irq, sh_mobile_ceu_irq,
1808                                0, dev_name(&pdev->dev), pcdev);
1809         if (err) {
1810                 dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
1811                 goto exit_release_mem;
1812         }
1813 
1814         pm_suspend_ignore_children(&pdev->dev, true);
1815         pm_runtime_enable(&pdev->dev);
1816         pm_runtime_resume(&pdev->dev);
1817 
1818         pcdev->ici.priv = pcdev;
1819         pcdev->ici.v4l2_dev.dev = &pdev->dev;
1820         pcdev->ici.nr = pdev->id;
1821         pcdev->ici.drv_name = dev_name(&pdev->dev);
1822         pcdev->ici.ops = &sh_mobile_ceu_host_ops;
1823         pcdev->ici.capabilities = SOCAM_HOST_CAP_STRIDE;
1824 
1825         pcdev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
1826         if (IS_ERR(pcdev->alloc_ctx)) {
1827                 err = PTR_ERR(pcdev->alloc_ctx);
1828                 goto exit_free_clk;
1829         }
1830 
1831         if (pcdev->pdata && pcdev->pdata->asd_sizes) {
1832                 struct v4l2_async_subdev **asd;
1833                 char name[] = "sh-mobile-csi2";
1834                 int j;
1835 
1836                 /*
1837                  * CSI2 interfacing: several groups can use CSI2, pick up the
1838                  * first one
1839                  */
1840                 asd = pcdev->pdata->asd;
1841                 for (j = 0; pcdev->pdata->asd_sizes[j]; j++) {
1842                         for (i = 0; i < pcdev->pdata->asd_sizes[j]; i++, asd++) {
1843                                 dev_dbg(&pdev->dev, "%s(): subdev #%d, type %u\n",
1844                                         __func__, i, (*asd)->match_type);
1845                                 if ((*asd)->match_type == V4L2_ASYNC_MATCH_DEVNAME &&
1846                                     !strncmp(name, (*asd)->match.device_name.name,
1847                                              sizeof(name) - 1)) {
1848                                         pcdev->csi2_asd = *asd;
1849                                         break;
1850                                 }
1851                         }
1852                         if (pcdev->csi2_asd)
1853                                 break;
1854                 }
1855 
1856                 pcdev->ici.asd = pcdev->pdata->asd;
1857                 pcdev->ici.asd_sizes = pcdev->pdata->asd_sizes;
1858         }
1859 
1860         /* Legacy CSI2 interfacing */
1861         csi2 = pcdev->pdata ? pcdev->pdata->csi2 : NULL;
1862         if (csi2) {
1863                 /*
1864                  * TODO: remove this once all users are converted to
1865                  * asynchronous CSI2 probing. If it has to be kept, csi2
1866                  * platform device resources have to be added, using
1867                  * platform_device_add_resources()
1868                  */
1869                 struct platform_device *csi2_pdev =
1870                         platform_device_alloc("sh-mobile-csi2", csi2->id);
1871                 struct sh_csi2_pdata *csi2_pdata = csi2->platform_data;
1872 
1873                 if (!csi2_pdev) {
1874                         err = -ENOMEM;
1875                         goto exit_free_ctx;
1876                 }
1877 
1878                 pcdev->csi2_pdev                = csi2_pdev;
1879 
1880                 err = platform_device_add_data(csi2_pdev, csi2_pdata,
1881                                                sizeof(*csi2_pdata));
1882                 if (err < 0)
1883                         goto exit_pdev_put;
1884 
1885                 csi2_pdev->resource             = csi2->resource;
1886                 csi2_pdev->num_resources        = csi2->num_resources;
1887 
1888                 err = platform_device_add(csi2_pdev);
1889                 if (err < 0)
1890                         goto exit_pdev_put;
1891 
1892                 wait.dev = &csi2_pdev->dev;
1893 
1894                 err = bus_register_notifier(&platform_bus_type, &wait.notifier);
1895                 if (err < 0)
1896                         goto exit_pdev_unregister;
1897 
1898                 /*
1899                  * From this point the driver module will not unload, until
1900                  * we complete the completion.
1901                  */
1902 
1903                 if (!csi2_pdev->dev.driver) {
1904                         complete(&wait.completion);
1905                         /* Either too late, or probing failed */
1906                         bus_unregister_notifier(&platform_bus_type, &wait.notifier);
1907                         err = -ENXIO;
1908                         goto exit_pdev_unregister;
1909                 }
1910 
1911                 /*
1912                  * The module is still loaded, in the worst case it is hanging
1913                  * in device release on our completion. So, _now_ dereferencing
1914                  * the "owner" is safe!
1915                  */
1916 
1917                 err = try_module_get(csi2_pdev->dev.driver->owner);
1918 
1919                 /* Let notifier complete, if it has been locked */
1920                 complete(&wait.completion);
1921                 bus_unregister_notifier(&platform_bus_type, &wait.notifier);
1922                 if (!err) {
1923                         err = -ENODEV;
1924                         goto exit_pdev_unregister;
1925                 }
1926 
1927                 pcdev->csi2_sd = platform_get_drvdata(csi2_pdev);
1928         }
1929 
1930         err = soc_camera_host_register(&pcdev->ici);
1931         if (err)
1932                 goto exit_csi2_unregister;
1933 
1934         if (csi2) {
1935                 err = v4l2_device_register_subdev(&pcdev->ici.v4l2_dev,
1936                                                   pcdev->csi2_sd);
1937                 dev_dbg(&pdev->dev, "%s(): ret(register_subdev) = %d\n",
1938                         __func__, err);
1939                 if (err < 0)
1940                         goto exit_host_unregister;
1941                 /* v4l2_device_register_subdev() took a reference too */
1942                 module_put(pcdev->csi2_sd->owner);
1943         }
1944 
1945         return 0;
1946 
1947 exit_host_unregister:
1948         soc_camera_host_unregister(&pcdev->ici);
1949 exit_csi2_unregister:
1950         if (csi2) {
1951                 module_put(pcdev->csi2_pdev->dev.driver->owner);
1952 exit_pdev_unregister:
1953                 platform_device_del(pcdev->csi2_pdev);
1954 exit_pdev_put:
1955                 pcdev->csi2_pdev->resource = NULL;
1956                 platform_device_put(pcdev->csi2_pdev);
1957         }
1958 exit_free_ctx:
1959         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
1960 exit_free_clk:
1961         pm_runtime_disable(&pdev->dev);
1962 exit_release_mem:
1963         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
1964                 dma_release_declared_memory(&pdev->dev);
1965         return err;
1966 }
1967 
1968 static int sh_mobile_ceu_remove(struct platform_device *pdev)
1969 {
1970         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
1971         struct sh_mobile_ceu_dev *pcdev = container_of(soc_host,
1972                                         struct sh_mobile_ceu_dev, ici);
1973         struct platform_device *csi2_pdev = pcdev->csi2_pdev;
1974 
1975         soc_camera_host_unregister(soc_host);
1976         pm_runtime_disable(&pdev->dev);
1977         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
1978                 dma_release_declared_memory(&pdev->dev);
1979         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
1980         if (csi2_pdev && csi2_pdev->dev.driver) {
1981                 struct module *csi2_drv = csi2_pdev->dev.driver->owner;
1982                 platform_device_del(csi2_pdev);
1983                 csi2_pdev->resource = NULL;
1984                 platform_device_put(csi2_pdev);
1985                 module_put(csi2_drv);
1986         }
1987 
1988         return 0;
1989 }
1990 
1991 static int sh_mobile_ceu_runtime_nop(struct device *dev)
1992 {
1993         /* Runtime PM callback shared between ->runtime_suspend()
1994          * and ->runtime_resume(). Simply returns success.
1995          *
1996          * This driver re-initializes all registers after
1997          * pm_runtime_get_sync() anyway so there is no need
1998          * to save and restore registers here.
1999          */
2000         return 0;
2001 }
2002 
2003 static const struct dev_pm_ops sh_mobile_ceu_dev_pm_ops = {
2004         .runtime_suspend = sh_mobile_ceu_runtime_nop,
2005         .runtime_resume = sh_mobile_ceu_runtime_nop,
2006 };
2007 
2008 static const struct of_device_id sh_mobile_ceu_of_match[] = {
2009         { .compatible = "renesas,sh-mobile-ceu" },
2010         { }
2011 };
2012 MODULE_DEVICE_TABLE(of, sh_mobile_ceu_of_match);
2013 
2014 static struct platform_driver sh_mobile_ceu_driver = {
2015         .driver         = {
2016                 .name   = "sh_mobile_ceu",
2017                 .pm     = &sh_mobile_ceu_dev_pm_ops,
2018                 .of_match_table = sh_mobile_ceu_of_match,
2019         },
2020         .probe          = sh_mobile_ceu_probe,
2021         .remove         = sh_mobile_ceu_remove,
2022 };
2023 
2024 static int __init sh_mobile_ceu_init(void)
2025 {
2026         /* Whatever return code */
2027         request_module("sh_mobile_csi2");
2028         return platform_driver_register(&sh_mobile_ceu_driver);
2029 }
2030 
2031 static void __exit sh_mobile_ceu_exit(void)
2032 {
2033         platform_driver_unregister(&sh_mobile_ceu_driver);
2034 }
2035 
2036 module_init(sh_mobile_ceu_init);
2037 module_exit(sh_mobile_ceu_exit);
2038 
2039 MODULE_DESCRIPTION("SuperH Mobile CEU driver");
2040 MODULE_AUTHOR("Magnus Damm");
2041 MODULE_LICENSE("GPL");
2042 MODULE_VERSION("0.1.0");
2043 MODULE_ALIAS("platform:sh_mobile_ceu");
2044 

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