kernel/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_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                         const void *parg,
 214                         unsigned int *count, unsigned int *num_planes,
 215                         unsigned int sizes[], void *alloc_ctxs[])
 216 {
 217         const struct v4l2_format *fmt = parg;
 218         struct soc_camera_device *icd = container_of(vq,
 219                         struct soc_camera_device, vb2_vidq);
 220         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 221         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 222
 223         if (fmt) {
 224                 const struct soc_camera_format_xlate *xlate = soc_camera_xlate_by_fourcc(icd,
 225                                                                 fmt->fmt.pix.pixelformat);
 226                 unsigned int bytes_per_line;
 227                 int ret;
 228
 229                 if (!xlate)
 230                         return -EINVAL;
 231
 232                 ret = soc_mbus_bytes_per_line(fmt->fmt.pix.width,
 233                                               xlate->host_fmt);
 234                 if (ret < 0)
 235                         return ret;
 236
 237                 bytes_per_line = max_t(u32, fmt->fmt.pix.bytesperline, ret);
 238
 239                 ret = soc_mbus_image_size(xlate->host_fmt, bytes_per_line,
 240                                           fmt->fmt.pix.height);
 241                 if (ret < 0)
 242                         return ret;
 243
 244                 sizes[0] = max_t(u32, fmt->fmt.pix.sizeimage, ret);
 245         } else {
 246                 /* Called from VIDIOC_REQBUFS or in compatibility mode */
 247                 sizes[0] = icd->sizeimage;
 248         }
 249
 250         alloc_ctxs[0] = pcdev->alloc_ctx;
 251
 252         if (!vq->num_buffers)
 253                 pcdev->sequence = 0;
 254
 255         if (!*count)
 256                 *count = 2;
 257
 258         /* If *num_planes != 0, we have already verified *count. */
 259         if (pcdev->video_limit && !*num_planes) {
 260                 size_t size = PAGE_ALIGN(sizes[0]) * *count;
 261
 262                 if (size + pcdev->buf_total > pcdev->video_limit)
 263                         *count = (pcdev->video_limit - pcdev->buf_total) /
 264                                 PAGE_ALIGN(sizes[0]);
 265         }
 266
 267         *num_planes = 1;
 268
 269         dev_dbg(icd->parent, "count=%d, size=%u\n", *count, sizes[0]);
 270
 271         return 0;
 272 }
 273
 274 #define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */
 275 #define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */
 276 #define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */
 277 #define CEU_CEIER_VBP   (1 << 20) /* vbp error */
 278 #define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */
 279 #define CEU_CEIER_MASK (CEU_CEIER_CPEIE | CEU_CEIER_VBP)
 280
 281
 282 /*
 283  * return value doesn't reflex the success/failure to queue the new buffer,
 284  * but rather the status of the previous buffer.
 285  */
 286 static int sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
 287 {
 288         struct soc_camera_device *icd = pcdev->ici.icd;
 289         dma_addr_t phys_addr_top, phys_addr_bottom;
 290         unsigned long top1, top2;
 291         unsigned long bottom1, bottom2;
 292         u32 status;
 293         bool planar;
 294         int ret = 0;
 295
 296         /*
 297          * The hardware is _very_ picky about this sequence. Especially
 298          * the CEU_CETCR_MAGIC value. It seems like we need to acknowledge
 299          * several not-so-well documented interrupt sources in CETCR.
 300          */
 301         ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_MASK);
 302         status = ceu_read(pcdev, CETCR);
 303         ceu_write(pcdev, CETCR, ~status & CEU_CETCR_MAGIC);
 304         if (!pcdev->frozen)
 305                 ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_MASK);
 306         ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP);
 307         ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW);
 308
 309         /*
 310          * When a VBP interrupt occurs, a capture end interrupt does not occur
 311          * and the image of that frame is not captured correctly. So, soft reset
 312          * is needed here.
 313          */
 314         if (status & CEU_CEIER_VBP) {
 315                 sh_mobile_ceu_soft_reset(pcdev);
 316                 ret = -EIO;
 317         }
 318
 319         if (pcdev->frozen) {
 320                 complete(&pcdev->complete);
 321                 return ret;
 322         }
 323
 324         if (!pcdev->active)
 325                 return ret;
 326
 327         if (V4L2_FIELD_INTERLACED_BT == pcdev->field) {
 328                 top1    = CDBYR;
 329                 top2    = CDBCR;
 330                 bottom1 = CDAYR;
 331                 bottom2 = CDACR;
 332         } else {
 333                 top1    = CDAYR;
 334                 top2    = CDACR;
 335                 bottom1 = CDBYR;
 336                 bottom2 = CDBCR;
 337         }
 338
 339         phys_addr_top =
 340                 vb2_dma_contig_plane_dma_addr(&pcdev->active->vb2_buf, 0);
 341
 342         switch (icd->current_fmt->host_fmt->fourcc) {
 343         case V4L2_PIX_FMT_NV12:
 344         case V4L2_PIX_FMT_NV21:
 345         case V4L2_PIX_FMT_NV16:
 346         case V4L2_PIX_FMT_NV61:
 347                 planar = true;
 348                 break;
 349         default:
 350                 planar = false;
 351         }
 352
 353         ceu_write(pcdev, top1, phys_addr_top);
 354         if (V4L2_FIELD_NONE != pcdev->field) {
 355                 phys_addr_bottom = phys_addr_top + icd->bytesperline;
 356                 ceu_write(pcdev, bottom1, phys_addr_bottom);
 357         }
 358
 359         if (planar) {
 360                 phys_addr_top += icd->bytesperline * icd->user_height;
 361                 ceu_write(pcdev, top2, phys_addr_top);
 362                 if (V4L2_FIELD_NONE != pcdev->field) {
 363                         phys_addr_bottom = phys_addr_top + icd->bytesperline;
 364                         ceu_write(pcdev, bottom2, phys_addr_bottom);
 365                 }
 366         }
 367
 368         ceu_write(pcdev, CAPSR, 0x1); /* start capture */
 369
 370         return ret;
 371 }
 372
 373 static int sh_mobile_ceu_videobuf_prepare(struct vb2_buffer *vb)
 374 {
 375         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 376         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vbuf);
 377
 378         /* Added list head initialization on alloc */
 379         WARN(!list_empty(&buf->queue), "Buffer %p on queue!\n", vb);
 380
 381         return 0;
 382 }
 383
 384 static void sh_mobile_ceu_videobuf_queue(struct vb2_buffer *vb)
 385 {
 386         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 387         struct soc_camera_device *icd = container_of(vb->vb2_queue,
 388                         struct soc_camera_device, vb2_vidq);
 389         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 390         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 391         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vbuf);
 392         unsigned long size;
 393
 394         size = icd->sizeimage;
 395
 396         if (vb2_plane_size(vb, 0) < size) {
 397                 dev_err(icd->parent, "Buffer #%d too small (%lu < %lu)\n",
 398                         vb->index, vb2_plane_size(vb, 0), size);
 399                 goto error;
 400         }
 401
 402         vb2_set_plane_payload(vb, 0, size);
 403
 404         dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
 405                 vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
 406
 407 #ifdef DEBUG
 408         /*
 409          * This can be useful if you want to see if we actually fill
 410          * the buffer with something
 411          */
 412         if (vb2_plane_vaddr(vb, 0))
 413                 memset(vb2_plane_vaddr(vb, 0), 0xaa, vb2_get_plane_payload(vb, 0));
 414 #endif
 415
 416         spin_lock_irq(&pcdev->lock);
 417         list_add_tail(&buf->queue, &pcdev->capture);
 418
 419         if (!pcdev->active) {
 420                 /*
 421                  * Because there were no active buffer at this moment,
 422                  * we are not interested in the return value of
 423                  * sh_mobile_ceu_capture here.
 424                  */
 425                 pcdev->active = vbuf;
 426                 sh_mobile_ceu_capture(pcdev);
 427         }
 428         spin_unlock_irq(&pcdev->lock);
 429
 430         return;
 431
 432 error:
 433         vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
 434 }
 435
 436 static void sh_mobile_ceu_videobuf_release(struct vb2_buffer *vb)
 437 {
 438         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 439         struct soc_camera_device *icd = container_of(vb->vb2_queue,
 440                         struct soc_camera_device, vb2_vidq);
 441         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 442         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vbuf);
 443         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 444
 445         spin_lock_irq(&pcdev->lock);
 446
 447         if (pcdev->active == vbuf) {
 448                 /* disable capture (release DMA buffer), reset */
 449                 ceu_write(pcdev, CAPSR, 1 << 16);
 450                 pcdev->active = NULL;
 451         }
 452
 453         /*
 454          * Doesn't hurt also if the list is empty, but it hurts, if queuing the
 455          * buffer failed, and .buf_init() hasn't been called
 456          */
 457         if (buf->queue.next)
 458                 list_del_init(&buf->queue);
 459
 460         pcdev->buf_total -= PAGE_ALIGN(vb2_plane_size(vb, 0));
 461         dev_dbg(icd->parent, "%s() %zu bytes buffers\n", __func__,
 462                 pcdev->buf_total);
 463
 464         spin_unlock_irq(&pcdev->lock);
 465 }
 466
 467 static int sh_mobile_ceu_videobuf_init(struct vb2_buffer *vb)
 468 {
 469         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 470         struct soc_camera_device *icd = container_of(vb->vb2_queue,
 471                         struct soc_camera_device, vb2_vidq);
 472         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 473         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 474
 475         pcdev->buf_total += PAGE_ALIGN(vb2_plane_size(vb, 0));
 476         dev_dbg(icd->parent, "%s() %zu bytes buffers\n", __func__,
 477                 pcdev->buf_total);
 478
 479         /* This is for locking debugging only */
 480         INIT_LIST_HEAD(&to_ceu_vb(vbuf)->queue);
 481         return 0;
 482 }
 483
 484 static void sh_mobile_ceu_stop_streaming(struct vb2_queue *q)
 485 {
 486         struct soc_camera_device *icd = container_of(q, struct soc_camera_device, vb2_vidq);
 487         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 488         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 489         struct list_head *buf_head, *tmp;
 490
 491         spin_lock_irq(&pcdev->lock);
 492
 493         pcdev->active = NULL;
 494
 495         list_for_each_safe(buf_head, tmp, &pcdev->capture)
 496                 list_del_init(buf_head);
 497
 498         spin_unlock_irq(&pcdev->lock);
 499
 500         sh_mobile_ceu_soft_reset(pcdev);
 501 }
 502
 503 static struct vb2_ops sh_mobile_ceu_videobuf_ops = {
 504         .queue_setup    = sh_mobile_ceu_videobuf_setup,
 505         .buf_prepare    = sh_mobile_ceu_videobuf_prepare,
 506         .buf_queue      = sh_mobile_ceu_videobuf_queue,
 507         .buf_cleanup    = sh_mobile_ceu_videobuf_release,
 508         .buf_init       = sh_mobile_ceu_videobuf_init,
 509         .wait_prepare   = vb2_ops_wait_prepare,
 510         .wait_finish    = vb2_ops_wait_finish,
 511         .stop_streaming = sh_mobile_ceu_stop_streaming,
 512 };
 513
 514 static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
 515 {
 516         struct sh_mobile_ceu_dev *pcdev = data;
 517         struct vb2_v4l2_buffer *vbuf;
 518         int ret;
 519
 520         spin_lock(&pcdev->lock);
 521
 522         vbuf = pcdev->active;
 523         if (!vbuf)
 524                 /* Stale interrupt from a released buffer */
 525                 goto out;
 526
 527         list_del_init(&to_ceu_vb(vbuf)->queue);
 528
 529         if (!list_empty(&pcdev->capture))
 530                 pcdev->active = &list_entry(pcdev->capture.next,
 531                                             struct sh_mobile_ceu_buffer, queue)->vb;
 532         else
 533                 pcdev->active = NULL;
 534
 535         ret = sh_mobile_ceu_capture(pcdev);
 536         v4l2_get_timestamp(&vbuf->timestamp);
 537         if (!ret) {
 538                 vbuf->field = pcdev->field;
 539                 vbuf->sequence = pcdev->sequence++;
 540         }
 541         vb2_buffer_done(&vbuf->vb2_buf,
 542                         ret < 0 ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 543
 544 out:
 545         spin_unlock(&pcdev->lock);
 546
 547         return IRQ_HANDLED;
 548 }
 549
 550 static struct v4l2_subdev *find_csi2(struct sh_mobile_ceu_dev *pcdev)
 551 {
 552         struct v4l2_subdev *sd;
 553
 554         if (pcdev->csi2_sd)
 555                 return pcdev->csi2_sd;
 556
 557         if (pcdev->csi2_asd) {
 558                 char name[] = "sh-mobile-csi2";
 559                 v4l2_device_for_each_subdev(sd, &pcdev->ici.v4l2_dev)
 560                         if (!strncmp(name, sd->name, sizeof(name) - 1)) {
 561                                 pcdev->csi2_sd = sd;
 562                                 return sd;
 563                         }
 564         }
 565
 566         return NULL;
 567 }
 568
 569 static struct v4l2_subdev *csi2_subdev(struct sh_mobile_ceu_dev *pcdev,
 570                                        struct soc_camera_device *icd)
 571 {
 572         struct v4l2_subdev *sd = pcdev->csi2_sd;
 573
 574         return sd && sd->grp_id == soc_camera_grp_id(icd) ? sd : NULL;
 575 }
 576
 577 static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
 578 {
 579         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 580         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 581         struct v4l2_subdev *csi2_sd = find_csi2(pcdev);
 582         int ret;
 583
 584         if (csi2_sd) {
 585                 csi2_sd->grp_id = soc_camera_grp_id(icd);
 586                 v4l2_set_subdev_hostdata(csi2_sd, icd);
 587         }
 588
 589         ret = v4l2_subdev_call(csi2_sd, core, s_power, 1);
 590         if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
 591                 return ret;
 592
 593         /*
 594          * -ENODEV is special: either csi2_sd == NULL or the CSI-2 driver
 595          * has not found this soc-camera device among its clients
 596          */
 597         if (csi2_sd && ret == -ENODEV)
 598                 csi2_sd->grp_id = 0;
 599
 600         dev_info(icd->parent,
 601                  "SuperH Mobile CEU%s driver attached to camera %d\n",
 602                  csi2_sd && csi2_sd->grp_id ? "/CSI-2" : "", icd->devnum);
 603
 604         return 0;
 605 }
 606
 607 static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
 608 {
 609         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 610         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 611         struct v4l2_subdev *csi2_sd = find_csi2(pcdev);
 612
 613         dev_info(icd->parent,
 614                  "SuperH Mobile CEU driver detached from camera %d\n",
 615                  icd->devnum);
 616
 617         v4l2_subdev_call(csi2_sd, core, s_power, 0);
 618 }
 619
 620 /* Called with .host_lock held */
 621 static int sh_mobile_ceu_clock_start(struct soc_camera_host *ici)
 622 {
 623         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 624
 625         pm_runtime_get_sync(ici->v4l2_dev.dev);
 626
 627         pcdev->buf_total = 0;
 628
 629         sh_mobile_ceu_soft_reset(pcdev);
 630
 631         return 0;
 632 }
 633
 634 /* Called with .host_lock held */
 635 static void sh_mobile_ceu_clock_stop(struct soc_camera_host *ici)
 636 {
 637         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 638
 639         /* disable capture, disable interrupts */
 640         ceu_write(pcdev, CEIER, 0);
 641         sh_mobile_ceu_soft_reset(pcdev);
 642
 643         /* make sure active buffer is canceled */
 644         spin_lock_irq(&pcdev->lock);
 645         if (pcdev->active) {
 646                 list_del_init(&to_ceu_vb(pcdev->active)->queue);
 647                 vb2_buffer_done(&pcdev->active->vb2_buf, VB2_BUF_STATE_ERROR);
 648                 pcdev->active = NULL;
 649         }
 650         spin_unlock_irq(&pcdev->lock);
 651
 652         pm_runtime_put(ici->v4l2_dev.dev);
 653 }
 654
 655 /*
 656  * See chapter 29.4.12 "Capture Filter Control Register (CFLCR)"
 657  * in SH7722 Hardware Manual
 658  */
 659 static unsigned int size_dst(unsigned int src, unsigned int scale)
 660 {
 661         unsigned int mant_pre = scale >> 12;
 662         if (!src || !scale)
 663                 return src;
 664         return ((mant_pre + 2 * (src - 1)) / (2 * mant_pre) - 1) *
 665                 mant_pre * 4096 / scale + 1;
 666 }
 667
 668 static u16 calc_scale(unsigned int src, unsigned int *dst)
 669 {
 670         u16 scale;
 671
 672         if (src == *dst)
 673                 return 0;
 674
 675         scale = (src * 4096 / *dst) & ~7;
 676
 677         while (scale > 4096 && size_dst(src, scale) < *dst)
 678                 scale -= 8;
 679
 680         *dst = size_dst(src, scale);
 681
 682         return scale;
 683 }
 684
 685 /* rect is guaranteed to not exceed the scaled camera rectangle */
 686 static void sh_mobile_ceu_set_rect(struct soc_camera_device *icd)
 687 {
 688         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 689         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 690         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 691         unsigned int height, width, cdwdr_width, in_width, in_height;
 692         unsigned int left_offset, top_offset;
 693         u32 camor;
 694
 695         dev_geo(icd->parent, "Crop %ux%u@%u:%u\n",
 696                 icd->user_width, icd->user_height, cam->ceu_left, cam->ceu_top);
 697
 698         left_offset     = cam->ceu_left;
 699         top_offset      = cam->ceu_top;
 700
 701         WARN_ON(icd->user_width & 3 || icd->user_height & 3);
 702
 703         width = icd->user_width;
 704
 705         if (pcdev->image_mode) {
 706                 in_width = cam->width;
 707                 if (!pcdev->is_16bit) {
 708                         in_width *= 2;
 709                         left_offset *= 2;
 710                 }
 711         } else {
 712                 unsigned int w_factor;
 713
 714                 switch (icd->current_fmt->host_fmt->packing) {
 715                 case SOC_MBUS_PACKING_2X8_PADHI:
 716                         w_factor = 2;
 717                         break;
 718                 default:
 719                         w_factor = 1;
 720                 }
 721
 722                 in_width = cam->width * w_factor;
 723                 left_offset *= w_factor;
 724         }
 725
 726         cdwdr_width = icd->bytesperline;
 727
 728         height = icd->user_height;
 729         in_height = cam->height;
 730         if (V4L2_FIELD_NONE != pcdev->field) {
 731                 height = (height / 2) & ~3;
 732                 in_height /= 2;
 733                 top_offset /= 2;
 734                 cdwdr_width *= 2;
 735         }
 736
 737         /* CSI2 special configuration */
 738         if (csi2_subdev(pcdev, icd)) {
 739                 in_width = ((in_width - 2) * 2);
 740                 left_offset *= 2;
 741         }
 742
 743         /* Set CAMOR, CAPWR, CFSZR, take care of CDWDR */
 744         camor = left_offset | (top_offset << 16);
 745
 746         dev_geo(icd->parent,
 747                 "CAMOR 0x%x, CAPWR 0x%x, CFSZR 0x%x, CDWDR 0x%x\n", camor,
 748                 (in_height << 16) | in_width, (height << 16) | width,
 749                 cdwdr_width);
 750
 751         ceu_write(pcdev, CAMOR, camor);
 752         ceu_write(pcdev, CAPWR, (in_height << 16) | in_width);
 753         /* CFSZR clipping is applied _after_ the scaling filter (CFLCR) */
 754         ceu_write(pcdev, CFSZR, (height << 16) | width);
 755         ceu_write(pcdev, CDWDR, cdwdr_width);
 756 }
 757
 758 static u32 capture_save_reset(struct sh_mobile_ceu_dev *pcdev)
 759 {
 760         u32 capsr = ceu_read(pcdev, CAPSR);
 761         ceu_write(pcdev, CAPSR, 1 << 16); /* reset, stop capture */
 762         return capsr;
 763 }
 764
 765 static void capture_restore(struct sh_mobile_ceu_dev *pcdev, u32 capsr)
 766 {
 767         unsigned long timeout = jiffies + 10 * HZ;
 768
 769         /*
 770          * Wait until the end of the current frame. It can take a long time,
 771          * but if it has been aborted by a CAPSR reset, it shoule exit sooner.
 772          */
 773         while ((ceu_read(pcdev, CSTSR) & 1) && time_before(jiffies, timeout))
 774                 msleep(1);
 775
 776         if (time_after(jiffies, timeout)) {
 777                 dev_err(pcdev->ici.v4l2_dev.dev,
 778                         "Timeout waiting for frame end! Interface problem?\n");
 779                 return;
 780         }
 781
 782         /* Wait until reset clears, this shall not hang... */
 783         while (ceu_read(pcdev, CAPSR) & (1 << 16))
 784                 udelay(10);
 785
 786         /* Anything to restore? */
 787         if (capsr & ~(1 << 16))
 788                 ceu_write(pcdev, CAPSR, capsr);
 789 }
 790
 791 /* Find the bus subdevice driver, e.g., CSI2 */
 792 static struct v4l2_subdev *find_bus_subdev(struct sh_mobile_ceu_dev *pcdev,
 793                                            struct soc_camera_device *icd)
 794 {
 795         return csi2_subdev(pcdev, icd) ? : soc_camera_to_subdev(icd);
 796 }
 797
 798 #define CEU_BUS_FLAGS (V4L2_MBUS_MASTER |       \
 799                 V4L2_MBUS_PCLK_SAMPLE_RISING |  \
 800                 V4L2_MBUS_HSYNC_ACTIVE_HIGH |   \
 801                 V4L2_MBUS_HSYNC_ACTIVE_LOW |    \
 802                 V4L2_MBUS_VSYNC_ACTIVE_HIGH |   \
 803                 V4L2_MBUS_VSYNC_ACTIVE_LOW |    \
 804                 V4L2_MBUS_DATA_ACTIVE_HIGH)
 805
 806 /* Capture is not running, no interrupts, no locking needed */
 807 static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd)
 808 {
 809         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 810         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 811         struct v4l2_subdev *sd = find_bus_subdev(pcdev, icd);
 812         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 813         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
 814         unsigned long value, common_flags = CEU_BUS_FLAGS;
 815         u32 capsr = capture_save_reset(pcdev);
 816         unsigned int yuv_lineskip;
 817         int ret;
 818
 819         /*
 820          * If the client doesn't implement g_mbus_config, we just use our
 821          * platform data
 822          */
 823         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
 824         if (!ret) {
 825                 common_flags = soc_mbus_config_compatible(&cfg,
 826                                                           common_flags);
 827                 if (!common_flags)
 828                         return -EINVAL;
 829         } else if (ret != -ENOIOCTLCMD) {
 830                 return ret;
 831         }
 832
 833         /* Make choises, based on platform preferences */
 834         if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
 835             (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
 836                 if (pcdev->flags & SH_CEU_FLAG_HSYNC_LOW)
 837                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
 838                 else
 839                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
 840         }
 841
 842         if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
 843             (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
 844                 if (pcdev->flags & SH_CEU_FLAG_VSYNC_LOW)
 845                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
 846                 else
 847                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
 848         }
 849
 850         cfg.flags = common_flags;
 851         ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
 852         if (ret < 0 && ret != -ENOIOCTLCMD)
 853                 return ret;
 854
 855         if (icd->current_fmt->host_fmt->bits_per_sample > 8)
 856                 pcdev->is_16bit = 1;
 857         else
 858                 pcdev->is_16bit = 0;
 859
 860         ceu_write(pcdev, CRCNTR, 0);
 861         ceu_write(pcdev, CRCMPR, 0);
 862
 863         value = 0x00000010; /* data fetch by default */
 864         yuv_lineskip = 0x10;
 865
 866         switch (icd->current_fmt->host_fmt->fourcc) {
 867         case V4L2_PIX_FMT_NV12:
 868         case V4L2_PIX_FMT_NV21:
 869                 /* convert 4:2:2 -> 4:2:0 */
 870                 yuv_lineskip = 0; /* skip for NV12/21, no skip for NV16/61 */
 871                 /* fall-through */
 872         case V4L2_PIX_FMT_NV16:
 873         case V4L2_PIX_FMT_NV61:
 874                 switch (cam->code) {
 875                 case MEDIA_BUS_FMT_UYVY8_2X8:
 876                         value = 0x00000000; /* Cb0, Y0, Cr0, Y1 */
 877                         break;
 878                 case MEDIA_BUS_FMT_VYUY8_2X8:
 879                         value = 0x00000100; /* Cr0, Y0, Cb0, Y1 */
 880                         break;
 881                 case MEDIA_BUS_FMT_YUYV8_2X8:
 882                         value = 0x00000200; /* Y0, Cb0, Y1, Cr0 */
 883                         break;
 884                 case MEDIA_BUS_FMT_YVYU8_2X8:
 885                         value = 0x00000300; /* Y0, Cr0, Y1, Cb0 */
 886                         break;
 887                 default:
 888                         BUG();
 889                 }
 890         }
 891
 892         if (icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV21 ||
 893             icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV61)
 894                 value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */
 895
 896         value |= common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
 897         value |= common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
 898
 899         if (csi2_subdev(pcdev, icd)) /* CSI2 mode */
 900                 value |= 3 << 12;
 901         else if (pcdev->is_16bit)
 902                 value |= 1 << 12;
 903         else if (pcdev->flags & SH_CEU_FLAG_LOWER_8BIT)
 904                 value |= 2 << 12;
 905
 906         ceu_write(pcdev, CAMCR, value);
 907
 908         ceu_write(pcdev, CAPCR, 0x00300000);
 909
 910         switch (pcdev->field) {
 911         case V4L2_FIELD_INTERLACED_TB:
 912                 value = 0x101;
 913                 break;
 914         case V4L2_FIELD_INTERLACED_BT:
 915                 value = 0x102;
 916                 break;
 917         default:
 918                 value = 0;
 919                 break;
 920         }
 921         ceu_write(pcdev, CAIFR, value);
 922
 923         sh_mobile_ceu_set_rect(icd);
 924         mdelay(1);
 925
 926         dev_geo(icd->parent, "CFLCR 0x%x\n", pcdev->cflcr);
 927         ceu_write(pcdev, CFLCR, pcdev->cflcr);
 928
 929         /*
 930          * A few words about byte order (observed in Big Endian mode)
 931          *
 932          * In data fetch mode bytes are received in chunks of 8 bytes.
 933          * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
 934          *
 935          * The data is however by default written to memory in reverse order:
 936          * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
 937          *
 938          * The lowest three bits of CDOCR allows us to do swapping,
 939          * using 7 we swap the data bytes to match the incoming order:
 940          * D0, D1, D2, D3, D4, D5, D6, D7
 941          */
 942         value = 0x00000007 | yuv_lineskip;
 943
 944         ceu_write(pcdev, CDOCR, value);
 945         ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
 946
 947         capture_restore(pcdev, capsr);
 948
 949         /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
 950         return 0;
 951 }
 952
 953 static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd,
 954                                        unsigned char buswidth)
 955 {
 956         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 957         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 958         struct v4l2_subdev *sd = find_bus_subdev(pcdev, icd);
 959         unsigned long common_flags = CEU_BUS_FLAGS;
 960         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
 961         int ret;
 962
 963         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
 964         if (!ret)
 965                 common_flags = soc_mbus_config_compatible(&cfg,
 966                                                           common_flags);
 967         else if (ret != -ENOIOCTLCMD)
 968                 return ret;
 969
 970         if (!common_flags || buswidth > 16)
 971                 return -EINVAL;
 972
 973         return 0;
 974 }
 975
 976 static const struct soc_mbus_pixelfmt sh_mobile_ceu_formats[] = {
 977         {
 978                 .fourcc                 = V4L2_PIX_FMT_NV12,
 979                 .name                   = "NV12",
 980                 .bits_per_sample        = 8,
 981                 .packing                = SOC_MBUS_PACKING_1_5X8,
 982                 .order                  = SOC_MBUS_ORDER_LE,
 983                 .layout                 = SOC_MBUS_LAYOUT_PLANAR_2Y_C,
 984         }, {
 985                 .fourcc                 = V4L2_PIX_FMT_NV21,
 986                 .name                   = "NV21",
 987                 .bits_per_sample        = 8,
 988                 .packing                = SOC_MBUS_PACKING_1_5X8,
 989                 .order                  = SOC_MBUS_ORDER_LE,
 990                 .layout                 = SOC_MBUS_LAYOUT_PLANAR_2Y_C,
 991         }, {
 992                 .fourcc                 = V4L2_PIX_FMT_NV16,
 993                 .name                   = "NV16",
 994                 .bits_per_sample        = 8,
 995                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
 996                 .order                  = SOC_MBUS_ORDER_LE,
 997                 .layout                 = SOC_MBUS_LAYOUT_PLANAR_Y_C,
 998         }, {
 999                 .fourcc                 = V4L2_PIX_FMT_NV61,
1000                 .name                   = "NV61",
1001                 .bits_per_sample        = 8,
1002                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
1003                 .order                  = SOC_MBUS_ORDER_LE,
1004                 .layout                 = SOC_MBUS_LAYOUT_PLANAR_Y_C,
1005         },
1006 };
1007
1008 /* This will be corrected as we get more formats */
1009 static bool sh_mobile_ceu_packing_supported(const struct soc_mbus_pixelfmt *fmt)
1010 {
1011         return  fmt->packing == SOC_MBUS_PACKING_NONE ||
1012                 (fmt->bits_per_sample == 8 &&
1013                  fmt->packing == SOC_MBUS_PACKING_1_5X8) ||
1014                 (fmt->bits_per_sample == 8 &&
1015                  fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
1016                 (fmt->bits_per_sample > 8 &&
1017                  fmt->packing == SOC_MBUS_PACKING_EXTEND16);
1018 }
1019
1020 static struct soc_camera_device *ctrl_to_icd(struct v4l2_ctrl *ctrl)
1021 {
1022         return container_of(ctrl->handler, struct soc_camera_device,
1023                                                         ctrl_handler);
1024 }
1025
1026 static int sh_mobile_ceu_s_ctrl(struct v4l2_ctrl *ctrl)
1027 {
1028         struct soc_camera_device *icd = ctrl_to_icd(ctrl);
1029         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1030         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1031
1032         switch (ctrl->id) {
1033         case V4L2_CID_SHARPNESS:
1034                 switch (icd->current_fmt->host_fmt->fourcc) {
1035                 case V4L2_PIX_FMT_NV12:
1036                 case V4L2_PIX_FMT_NV21:
1037                 case V4L2_PIX_FMT_NV16:
1038                 case V4L2_PIX_FMT_NV61:
1039                         ceu_write(pcdev, CLFCR, !ctrl->val);
1040                         return 0;
1041                 }
1042                 break;
1043         }
1044
1045         return -EINVAL;
1046 }
1047
1048 static const struct v4l2_ctrl_ops sh_mobile_ceu_ctrl_ops = {
1049         .s_ctrl = sh_mobile_ceu_s_ctrl,
1050 };
1051
1052 static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, unsigned int idx,
1053                                      struct soc_camera_format_xlate *xlate)
1054 {
1055         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1056         struct device *dev = icd->parent;
1057         struct soc_camera_host *ici = to_soc_camera_host(dev);
1058         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1059         int ret, k, n;
1060         int formats = 0;
1061         struct sh_mobile_ceu_cam *cam;
1062         struct v4l2_subdev_mbus_code_enum code = {
1063                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1064                 .index = idx,
1065         };
1066         const struct soc_mbus_pixelfmt *fmt;
1067
1068         ret = v4l2_subdev_call(sd, pad, enum_mbus_code, NULL, &code);
1069         if (ret < 0)
1070                 /* No more formats */
1071                 return 0;
1072
1073         fmt = soc_mbus_get_fmtdesc(code.code);
1074         if (!fmt) {
1075                 dev_warn(dev, "unsupported format code #%u: %d\n", idx, code.code);
1076                 return 0;
1077         }
1078
1079         if (!csi2_subdev(pcdev, icd)) {
1080                 /* Are there any restrictions in the CSI-2 case? */
1081                 ret = sh_mobile_ceu_try_bus_param(icd, fmt->bits_per_sample);
1082                 if (ret < 0)
1083                         return 0;
1084         }
1085
1086         if (!icd->host_priv) {
1087                 struct v4l2_subdev_format fmt = {
1088                         .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1089                 };
1090                 struct v4l2_mbus_framefmt *mf = &fmt.format;
1091                 struct v4l2_rect rect;
1092                 int shift = 0;
1093
1094                 /* Add our control */
1095                 v4l2_ctrl_new_std(&icd->ctrl_handler, &sh_mobile_ceu_ctrl_ops,
1096                                   V4L2_CID_SHARPNESS, 0, 1, 1, 1);
1097                 if (icd->ctrl_handler.error)
1098                         return icd->ctrl_handler.error;
1099
1100                 /* FIXME: subwindow is lost between close / open */
1101
1102                 /* Cache current client geometry */
1103                 ret = soc_camera_client_g_rect(sd, &rect);
1104                 if (ret < 0)
1105                         return ret;
1106
1107                 /* First time */
1108                 ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &fmt);
1109                 if (ret < 0)
1110                         return ret;
1111
1112                 /*
1113                  * All currently existing CEU implementations support 2560x1920
1114                  * or larger frames. If the sensor is proposing too big a frame,
1115                  * don't bother with possibly supportred by the CEU larger
1116                  * sizes, just try VGA multiples. If needed, this can be
1117                  * adjusted in the future.
1118                  */
1119                 while ((mf->width > pcdev->max_width ||
1120                         mf->height > pcdev->max_height) && shift < 4) {
1121                         /* Try 2560x1920, 1280x960, 640x480, 320x240 */
1122                         mf->width       = 2560 >> shift;
1123                         mf->height      = 1920 >> shift;
1124                         ret = v4l2_device_call_until_err(sd->v4l2_dev,
1125                                         soc_camera_grp_id(icd), pad,
1126                                         set_fmt, NULL, &fmt);
1127                         if (ret < 0)
1128                                 return ret;
1129                         shift++;
1130                 }
1131
1132                 if (shift == 4) {
1133                         dev_err(dev, "Failed to configure the client below %ux%x\n",
1134                                 mf->width, mf->height);
1135                         return -EIO;
1136                 }
1137
1138                 dev_geo(dev, "camera fmt %ux%u\n", mf->width, mf->height);
1139
1140                 cam = kzalloc(sizeof(*cam), GFP_KERNEL);
1141                 if (!cam)
1142                         return -ENOMEM;
1143
1144                 /* We are called with current camera crop, initialise subrect with it */
1145                 cam->rect       = rect;
1146                 cam->subrect    = rect;
1147
1148                 cam->width      = mf->width;
1149                 cam->height     = mf->height;
1150
1151                 icd->host_priv = cam;
1152         } else {
1153                 cam = icd->host_priv;
1154         }
1155
1156         /* Beginning of a pass */
1157         if (!idx)
1158                 cam->extra_fmt = NULL;
1159
1160         switch (code.code) {
1161         case MEDIA_BUS_FMT_UYVY8_2X8:
1162         case MEDIA_BUS_FMT_VYUY8_2X8:
1163         case MEDIA_BUS_FMT_YUYV8_2X8:
1164         case MEDIA_BUS_FMT_YVYU8_2X8:
1165                 if (cam->extra_fmt)
1166                         break;
1167
1168                 /*
1169                  * Our case is simple so far: for any of the above four camera
1170                  * formats we add all our four synthesized NV* formats, so,
1171                  * just marking the device with a single flag suffices. If
1172                  * the format generation rules are more complex, you would have
1173                  * to actually hang your already added / counted formats onto
1174                  * the host_priv pointer and check whether the format you're
1175                  * going to add now is already there.
1176                  */
1177                 cam->extra_fmt = sh_mobile_ceu_formats;
1178
1179                 n = ARRAY_SIZE(sh_mobile_ceu_formats);
1180                 formats += n;
1181                 for (k = 0; xlate && k < n; k++) {
1182                         xlate->host_fmt = &sh_mobile_ceu_formats[k];
1183                         xlate->code     = code.code;
1184                         xlate++;
1185                         dev_dbg(dev, "Providing format %s using code %d\n",
1186                                 sh_mobile_ceu_formats[k].name, code.code);
1187                 }
1188                 break;
1189         default:
1190                 if (!sh_mobile_ceu_packing_supported(fmt))
1191                         return 0;
1192         }
1193
1194         /* Generic pass-through */
1195         formats++;
1196         if (xlate) {
1197                 xlate->host_fmt = fmt;
1198                 xlate->code     = code.code;
1199                 xlate++;
1200                 dev_dbg(dev, "Providing format %s in pass-through mode\n",
1201                         fmt->name);
1202         }
1203
1204         return formats;
1205 }
1206
1207 static void sh_mobile_ceu_put_formats(struct soc_camera_device *icd)
1208 {
1209         kfree(icd->host_priv);
1210         icd->host_priv = NULL;
1211 }
1212
1213 #define scale_down(size, scale) soc_camera_shift_scale(size, 12, scale)
1214 #define calc_generic_scale(in, out) soc_camera_calc_scale(in, 12, out)
1215
1216 /*
1217  * CEU can scale and crop, but we don't want to waste bandwidth and kill the
1218  * framerate by always requesting the maximum image from the client. See
1219  * Documentation/video4linux/sh_mobile_ceu_camera.txt for a description of
1220  * scaling and cropping algorithms and for the meaning of referenced here steps.
1221  */
1222 static int sh_mobile_ceu_set_crop(struct soc_camera_device *icd,
1223                                   const struct v4l2_crop *a)
1224 {
1225         struct v4l2_crop a_writable = *a;
1226         const struct v4l2_rect *rect = &a_writable.c;
1227         struct device *dev = icd->parent;
1228         struct soc_camera_host *ici = to_soc_camera_host(dev);
1229         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1230         struct v4l2_crop cam_crop;
1231         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1232         struct v4l2_rect *cam_rect = &cam_crop.c;
1233         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1234         struct v4l2_subdev_format fmt = {
1235                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1236         };
1237         struct v4l2_mbus_framefmt *mf = &fmt.format;
1238         unsigned int scale_cam_h, scale_cam_v, scale_ceu_h, scale_ceu_v,
1239                 out_width, out_height;
1240         int interm_width, interm_height;
1241         u32 capsr, cflcr;
1242         int ret;
1243
1244         dev_geo(dev, "S_CROP(%ux%u@%u:%u)\n", rect->width, rect->height,
1245                 rect->left, rect->top);
1246
1247         /* During camera cropping its output window can change too, stop CEU */
1248         capsr = capture_save_reset(pcdev);
1249         dev_dbg(dev, "CAPSR 0x%x, CFLCR 0x%x\n", capsr, pcdev->cflcr);
1250
1251         /*
1252          * 1. - 2. Apply iterative camera S_CROP for new input window, read back
1253          * actual camera rectangle.
1254          */
1255         ret = soc_camera_client_s_crop(sd, &a_writable, &cam_crop,
1256                                        &cam->rect, &cam->subrect);
1257         if (ret < 0)
1258                 return ret;
1259
1260         dev_geo(dev, "1-2: camera cropped to %ux%u@%u:%u\n",
1261                 cam_rect->width, cam_rect->height,
1262                 cam_rect->left, cam_rect->top);
1263
1264         /* On success cam_crop contains current camera crop */
1265
1266         /* 3. Retrieve camera output window */
1267         ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &fmt);
1268         if (ret < 0)
1269                 return ret;
1270
1271         if (mf->width > pcdev->max_width || mf->height > pcdev->max_height)
1272                 return -EINVAL;
1273
1274         /* 4. Calculate camera scales */
1275         scale_cam_h     = calc_generic_scale(cam_rect->width, mf->width);
1276         scale_cam_v     = calc_generic_scale(cam_rect->height, mf->height);
1277
1278         /* Calculate intermediate window */
1279         interm_width    = scale_down(rect->width, scale_cam_h);
1280         interm_height   = scale_down(rect->height, scale_cam_v);
1281
1282         if (interm_width < icd->user_width) {
1283                 u32 new_scale_h;
1284
1285                 new_scale_h = calc_generic_scale(rect->width, icd->user_width);
1286
1287                 mf->width = scale_down(cam_rect->width, new_scale_h);
1288         }
1289
1290         if (interm_height < icd->user_height) {
1291                 u32 new_scale_v;
1292
1293                 new_scale_v = calc_generic_scale(rect->height, icd->user_height);
1294
1295                 mf->height = scale_down(cam_rect->height, new_scale_v);
1296         }
1297
1298         if (interm_width < icd->user_width || interm_height < icd->user_height) {
1299                 ret = v4l2_device_call_until_err(sd->v4l2_dev,
1300                                         soc_camera_grp_id(icd), pad,
1301                                         set_fmt, NULL, &fmt);
1302                 if (ret < 0)
1303                         return ret;
1304
1305                 dev_geo(dev, "New camera output %ux%u\n", mf->width, mf->height);
1306                 scale_cam_h     = calc_generic_scale(cam_rect->width, mf->width);
1307                 scale_cam_v     = calc_generic_scale(cam_rect->height, mf->height);
1308                 interm_width    = scale_down(rect->width, scale_cam_h);
1309                 interm_height   = scale_down(rect->height, scale_cam_v);
1310         }
1311
1312         /* Cache camera output window */
1313         cam->width      = mf->width;
1314         cam->height     = mf->height;
1315
1316         if (pcdev->image_mode) {
1317                 out_width       = min(interm_width, icd->user_width);
1318                 out_height      = min(interm_height, icd->user_height);
1319         } else {
1320                 out_width       = interm_width;
1321                 out_height      = interm_height;
1322         }
1323
1324         /*
1325          * 5. Calculate CEU scales from camera scales from results of (5) and
1326          *    the user window
1327          */
1328         scale_ceu_h     = calc_scale(interm_width, &out_width);
1329         scale_ceu_v     = calc_scale(interm_height, &out_height);
1330
1331         dev_geo(dev, "5: CEU scales %u:%u\n", scale_ceu_h, scale_ceu_v);
1332
1333         /* Apply CEU scales. */
1334         cflcr = scale_ceu_h | (scale_ceu_v << 16);
1335         if (cflcr != pcdev->cflcr) {
1336                 pcdev->cflcr = cflcr;
1337                 ceu_write(pcdev, CFLCR, cflcr);
1338         }
1339
1340         icd->user_width  = out_width & ~3;
1341         icd->user_height = out_height & ~3;
1342         /* Offsets are applied at the CEU scaling filter input */
1343         cam->ceu_left    = scale_down(rect->left - cam_rect->left, scale_cam_h) & ~1;
1344         cam->ceu_top     = scale_down(rect->top - cam_rect->top, scale_cam_v) & ~1;
1345
1346         /* 6. Use CEU cropping to crop to the new window. */
1347         sh_mobile_ceu_set_rect(icd);
1348
1349         cam->subrect = *rect;
1350
1351         dev_geo(dev, "6: CEU cropped to %ux%u@%u:%u\n",
1352                 icd->user_width, icd->user_height,
1353                 cam->ceu_left, cam->ceu_top);
1354
1355         /* Restore capture. The CE bit can be cleared by the hardware */
1356         if (pcdev->active)
1357                 capsr |= 1;
1358         capture_restore(pcdev, capsr);
1359
1360         /* Even if only camera cropping succeeded */
1361         return ret;
1362 }
1363
1364 static int sh_mobile_ceu_get_crop(struct soc_camera_device *icd,
1365                                   struct v4l2_crop *a)
1366 {
1367         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1368
1369         a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1370         a->c = cam->subrect;
1371
1372         return 0;
1373 }
1374
1375 /* Similar to set_crop multistage iterative algorithm */
1376 static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
1377                                  struct v4l2_format *f)
1378 {
1379         struct device *dev = icd->parent;
1380         struct soc_camera_host *ici = to_soc_camera_host(dev);
1381         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1382         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1383         struct v4l2_pix_format *pix = &f->fmt.pix;
1384         struct v4l2_mbus_framefmt mf;
1385         __u32 pixfmt = pix->pixelformat;
1386         const struct soc_camera_format_xlate *xlate;
1387         unsigned int ceu_sub_width = pcdev->max_width,
1388                 ceu_sub_height = pcdev->max_height;
1389         u16 scale_v, scale_h;
1390         int ret;
1391         bool image_mode;
1392         enum v4l2_field field;
1393
1394         switch (pix->field) {
1395         default:
1396                 pix->field = V4L2_FIELD_NONE;
1397                 /* fall-through */
1398         case V4L2_FIELD_INTERLACED_TB:
1399         case V4L2_FIELD_INTERLACED_BT:
1400         case V4L2_FIELD_NONE:
1401                 field = pix->field;
1402                 break;
1403         case V4L2_FIELD_INTERLACED:
1404                 field = V4L2_FIELD_INTERLACED_TB;
1405                 break;
1406         }
1407
1408         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1409         if (!xlate) {
1410                 dev_warn(dev, "Format %x not found\n", pixfmt);
1411                 return -EINVAL;
1412         }
1413
1414         /* 1.-4. Calculate desired client output geometry */
1415         soc_camera_calc_client_output(icd, &cam->rect, &cam->subrect, pix, &mf, 12);
1416         mf.field        = pix->field;
1417         mf.colorspace   = pix->colorspace;
1418         mf.code         = xlate->code;
1419
1420         switch (pixfmt) {
1421         case V4L2_PIX_FMT_NV12:
1422         case V4L2_PIX_FMT_NV21:
1423         case V4L2_PIX_FMT_NV16:
1424         case V4L2_PIX_FMT_NV61:
1425                 image_mode = true;
1426                 break;
1427         default:
1428                 image_mode = false;
1429         }
1430
1431         dev_geo(dev, "S_FMT(pix=0x%x, fld 0x%x, code 0x%x, %ux%u)\n", pixfmt, mf.field, mf.code,
1432                 pix->width, pix->height);
1433
1434         dev_geo(dev, "4: request camera output %ux%u\n", mf.width, mf.height);
1435
1436         /* 5. - 9. */
1437         ret = soc_camera_client_scale(icd, &cam->rect, &cam->subrect,
1438                                 &mf, &ceu_sub_width, &ceu_sub_height,
1439                                 image_mode && V4L2_FIELD_NONE == field, 12);
1440
1441         dev_geo(dev, "5-9: client scale return %d\n", ret);
1442
1443         /* Done with the camera. Now see if we can improve the result */
1444
1445         dev_geo(dev, "fmt %ux%u, requested %ux%u\n",
1446                 mf.width, mf.height, pix->width, pix->height);
1447         if (ret < 0)
1448                 return ret;
1449
1450         if (mf.code != xlate->code)
1451                 return -EINVAL;
1452
1453         /* 9. Prepare CEU crop */
1454         cam->width = mf.width;
1455         cam->height = mf.height;
1456
1457         /* 10. Use CEU scaling to scale to the requested user window. */
1458
1459         /* We cannot scale up */
1460         if (pix->width > ceu_sub_width)
1461                 ceu_sub_width = pix->width;
1462
1463         if (pix->height > ceu_sub_height)
1464                 ceu_sub_height = pix->height;
1465
1466         pix->colorspace = mf.colorspace;
1467
1468         if (image_mode) {
1469                 /* Scale pix->{width x height} down to width x height */
1470                 scale_h         = calc_scale(ceu_sub_width, &pix->width);
1471                 scale_v         = calc_scale(ceu_sub_height, &pix->height);
1472         } else {
1473                 pix->width      = ceu_sub_width;
1474                 pix->height     = ceu_sub_height;
1475                 scale_h         = 0;
1476                 scale_v         = 0;
1477         }
1478
1479         pcdev->cflcr = scale_h | (scale_v << 16);
1480
1481         /*
1482          * We have calculated CFLCR, the actual configuration will be performed
1483          * in sh_mobile_ceu_set_bus_param()
1484          */
1485
1486         dev_geo(dev, "10: W: %u : 0x%x = %u, H: %u : 0x%x = %u\n",
1487                 ceu_sub_width, scale_h, pix->width,
1488                 ceu_sub_height, scale_v, pix->height);
1489
1490         cam->code               = xlate->code;
1491         icd->current_fmt        = xlate;
1492
1493         pcdev->field = field;
1494         pcdev->image_mode = image_mode;
1495
1496         /* CFSZR requirement */
1497         pix->width      &= ~3;
1498         pix->height     &= ~3;
1499
1500         return 0;
1501 }
1502
1503 #define CEU_CHDW_MAX    8188U   /* Maximum line stride */
1504
1505 static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
1506                                  struct v4l2_format *f)
1507 {
1508         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1509         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1510         const struct soc_camera_format_xlate *xlate;
1511         struct v4l2_pix_format *pix = &f->fmt.pix;
1512         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1513         struct v4l2_subdev_pad_config pad_cfg;
1514         struct v4l2_subdev_format format = {
1515                 .which = V4L2_SUBDEV_FORMAT_TRY,
1516         };
1517         struct v4l2_mbus_framefmt *mf = &format.format;
1518         __u32 pixfmt = pix->pixelformat;
1519         int width, height;
1520         int ret;
1521
1522         dev_geo(icd->parent, "TRY_FMT(pix=0x%x, %ux%u)\n",
1523                  pixfmt, pix->width, pix->height);
1524
1525         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1526         if (!xlate) {
1527                 xlate = icd->current_fmt;
1528                 dev_dbg(icd->parent, "Format %x not found, keeping %x\n",
1529                         pixfmt, xlate->host_fmt->fourcc);
1530                 pixfmt = xlate->host_fmt->fourcc;
1531                 pix->pixelformat = pixfmt;
1532                 pix->colorspace = icd->colorspace;
1533         }
1534
1535         /* FIXME: calculate using depth and bus width */
1536
1537         /* CFSZR requires height and width to be 4-pixel aligned */
1538         v4l_bound_align_image(&pix->width, 2, pcdev->max_width, 2,
1539                               &pix->height, 4, pcdev->max_height, 2, 0);
1540
1541         width = pix->width;
1542         height = pix->height;
1543
1544         /* limit to sensor capabilities */
1545         mf->width       = pix->width;
1546         mf->height      = pix->height;
1547         mf->field       = pix->field;
1548         mf->code        = xlate->code;
1549         mf->colorspace  = pix->colorspace;
1550
1551         ret = v4l2_device_call_until_err(sd->v4l2_dev, soc_camera_grp_id(icd),
1552                                          pad, set_fmt, &pad_cfg, &format);
1553         if (ret < 0)
1554                 return ret;
1555
1556         pix->width      = mf->width;
1557         pix->height     = mf->height;
1558         pix->field      = mf->field;
1559         pix->colorspace = mf->colorspace;
1560
1561         switch (pixfmt) {
1562         case V4L2_PIX_FMT_NV12:
1563         case V4L2_PIX_FMT_NV21:
1564         case V4L2_PIX_FMT_NV16:
1565         case V4L2_PIX_FMT_NV61:
1566                 /* FIXME: check against rect_max after converting soc-camera */
1567                 /* We can scale precisely, need a bigger image from camera */
1568                 if (pix->width < width || pix->height < height) {
1569                         /*
1570                          * We presume, the sensor behaves sanely, i.e., if
1571                          * requested a bigger rectangle, it will not return a
1572                          * smaller one.
1573                          */
1574                         mf->width = pcdev->max_width;
1575                         mf->height = pcdev->max_height;
1576                         ret = v4l2_device_call_until_err(sd->v4l2_dev,
1577                                         soc_camera_grp_id(icd), pad,
1578                                         set_fmt, &pad_cfg, &format);
1579                         if (ret < 0) {
1580                                 /* Shouldn't actually happen... */
1581                                 dev_err(icd->parent,
1582                                         "FIXME: client try_fmt() = %d\n", ret);
1583                                 return ret;
1584                         }
1585                 }
1586                 /* We will scale exactly */
1587                 if (mf->width > width)
1588                         pix->width = width;
1589                 if (mf->height > height)
1590                         pix->height = height;
1591
1592                 pix->bytesperline = max(pix->bytesperline, pix->width);
1593                 pix->bytesperline = min(pix->bytesperline, CEU_CHDW_MAX);
1594                 pix->bytesperline &= ~3;
1595                 break;
1596
1597         default:
1598                 /* Configurable stride isn't supported in pass-through mode. */
1599                 pix->bytesperline  = 0;
1600         }
1601
1602         pix->width      &= ~3;
1603         pix->height     &= ~3;
1604         pix->sizeimage  = 0;
1605
1606         dev_geo(icd->parent, "%s(): return %d, fmt 0x%x, %ux%u\n",
1607                 __func__, ret, pix->pixelformat, pix->width, pix->height);
1608
1609         return ret;
1610 }
1611
1612 static int sh_mobile_ceu_set_livecrop(struct soc_camera_device *icd,
1613                                       const struct v4l2_crop *a)
1614 {
1615         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1616         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1617         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1618         u32 out_width = icd->user_width, out_height = icd->user_height;
1619         int ret;
1620
1621         /* Freeze queue */
1622         pcdev->frozen = 1;
1623         /* Wait for frame */
1624         ret = wait_for_completion_interruptible(&pcdev->complete);
1625         /* Stop the client */
1626         ret = v4l2_subdev_call(sd, video, s_stream, 0);
1627         if (ret < 0)
1628                 dev_warn(icd->parent,
1629                          "Client failed to stop the stream: %d\n", ret);
1630         else
1631                 /* Do the crop, if it fails, there's nothing more we can do */
1632                 sh_mobile_ceu_set_crop(icd, a);
1633
1634         dev_geo(icd->parent, "Output after crop: %ux%u\n", icd->user_width, icd->user_height);
1635
1636         if (icd->user_width != out_width || icd->user_height != out_height) {
1637                 struct v4l2_format f = {
1638                         .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1639                         .fmt.pix        = {
1640                                 .width          = out_width,
1641                                 .height         = out_height,
1642                                 .pixelformat    = icd->current_fmt->host_fmt->fourcc,
1643                                 .field          = pcdev->field,
1644                                 .colorspace     = icd->colorspace,
1645                         },
1646                 };
1647                 ret = sh_mobile_ceu_set_fmt(icd, &f);
1648                 if (!ret && (out_width != f.fmt.pix.width ||
1649                              out_height != f.fmt.pix.height))
1650                         ret = -EINVAL;
1651                 if (!ret) {
1652                         icd->user_width         = out_width & ~3;
1653                         icd->user_height        = out_height & ~3;
1654                         ret = sh_mobile_ceu_set_bus_param(icd);
1655                 }
1656         }
1657
1658         /* Thaw the queue */
1659         pcdev->frozen = 0;
1660         spin_lock_irq(&pcdev->lock);
1661         sh_mobile_ceu_capture(pcdev);
1662         spin_unlock_irq(&pcdev->lock);
1663         /* Start the client */
1664         ret = v4l2_subdev_call(sd, video, s_stream, 1);
1665         return ret;
1666 }
1667
1668 static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
1669 {
1670         struct soc_camera_device *icd = file->private_data;
1671
1672         return vb2_poll(&icd->vb2_vidq, file, pt);
1673 }
1674
1675 static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
1676                                   struct v4l2_capability *cap)
1677 {
1678         strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
1679         strlcpy(cap->driver, "sh_mobile_ceu", sizeof(cap->driver));
1680         strlcpy(cap->bus_info, "platform:sh_mobile_ceu", sizeof(cap->bus_info));
1681         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1682         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
1683
1684         return 0;
1685 }
1686
1687 static int sh_mobile_ceu_init_videobuf(struct vb2_queue *q,
1688                                        struct soc_camera_device *icd)
1689 {
1690         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1691
1692         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1693         q->io_modes = VB2_MMAP | VB2_USERPTR;
1694         q->drv_priv = icd;
1695         q->ops = &sh_mobile_ceu_videobuf_ops;
1696         q->mem_ops = &vb2_dma_contig_memops;
1697         q->buf_struct_size = sizeof(struct sh_mobile_ceu_buffer);
1698         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1699         q->lock = &ici->host_lock;
1700
1701         return vb2_queue_init(q);
1702 }
1703
1704 static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
1705         .owner          = THIS_MODULE,
1706         .add            = sh_mobile_ceu_add_device,
1707         .remove         = sh_mobile_ceu_remove_device,
1708         .clock_start    = sh_mobile_ceu_clock_start,
1709         .clock_stop     = sh_mobile_ceu_clock_stop,
1710         .get_formats    = sh_mobile_ceu_get_formats,
1711         .put_formats    = sh_mobile_ceu_put_formats,
1712         .get_crop       = sh_mobile_ceu_get_crop,
1713         .set_crop       = sh_mobile_ceu_set_crop,
1714         .set_livecrop   = sh_mobile_ceu_set_livecrop,
1715         .set_fmt        = sh_mobile_ceu_set_fmt,
1716         .try_fmt        = sh_mobile_ceu_try_fmt,
1717         .poll           = sh_mobile_ceu_poll,
1718         .querycap       = sh_mobile_ceu_querycap,
1719         .set_bus_param  = sh_mobile_ceu_set_bus_param,
1720         .init_videobuf2 = sh_mobile_ceu_init_videobuf,
1721 };
1722
1723 struct bus_wait {
1724         struct notifier_block   notifier;
1725         struct completion       completion;
1726         struct device           *dev;
1727 };
1728
1729 static int bus_notify(struct notifier_block *nb,
1730                       unsigned long action, void *data)
1731 {
1732         struct device *dev = data;
1733         struct bus_wait *wait = container_of(nb, struct bus_wait, notifier);
1734
1735         if (wait->dev != dev)
1736                 return NOTIFY_DONE;
1737
1738         switch (action) {
1739         case BUS_NOTIFY_UNBOUND_DRIVER:
1740                 /* Protect from module unloading */
1741                 wait_for_completion(&wait->completion);
1742                 return NOTIFY_OK;
1743         }
1744         return NOTIFY_DONE;
1745 }
1746
1747 static int sh_mobile_ceu_probe(struct platform_device *pdev)
1748 {
1749         struct sh_mobile_ceu_dev *pcdev;
1750         struct resource *res;
1751         void __iomem *base;
1752         unsigned int irq;
1753         int err, i;
1754         struct bus_wait wait = {
1755                 .completion = COMPLETION_INITIALIZER_ONSTACK(wait.completion),
1756                 .notifier.notifier_call = bus_notify,
1757         };
1758         struct sh_mobile_ceu_companion *csi2;
1759
1760         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1761         irq = platform_get_irq(pdev, 0);
1762         if (!res || (int)irq <= 0) {
1763                 dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
1764                 return -ENODEV;
1765         }
1766
1767         pcdev = devm_kzalloc(&pdev->dev, sizeof(*pcdev), GFP_KERNEL);
1768         if (!pcdev) {
1769                 dev_err(&pdev->dev, "Could not allocate pcdev\n");
1770                 return -ENOMEM;
1771         }
1772
1773         INIT_LIST_HEAD(&pcdev->capture);
1774         spin_lock_init(&pcdev->lock);
1775         init_completion(&pcdev->complete);
1776
1777         pcdev->pdata = pdev->dev.platform_data;
1778         if (!pcdev->pdata && !pdev->dev.of_node) {
1779                 dev_err(&pdev->dev, "CEU platform data not set.\n");
1780                 return -EINVAL;
1781         }
1782
1783         /* TODO: implement per-device bus flags */
1784         if (pcdev->pdata) {
1785                 pcdev->max_width = pcdev->pdata->max_width;
1786                 pcdev->max_height = pcdev->pdata->max_height;
1787                 pcdev->flags = pcdev->pdata->flags;
1788         }
1789         pcdev->field = V4L2_FIELD_NONE;
1790
1791         if (!pcdev->max_width) {
1792                 unsigned int v;
1793                 err = of_property_read_u32(pdev->dev.of_node, "renesas,max-width", &v);
1794                 if (!err)
1795                         pcdev->max_width = v;
1796
1797                 if (!pcdev->max_width)
1798                         pcdev->max_width = 2560;
1799         }
1800         if (!pcdev->max_height) {
1801                 unsigned int v;
1802                 err = of_property_read_u32(pdev->dev.of_node, "renesas,max-height", &v);
1803                 if (!err)
1804                         pcdev->max_height = v;
1805
1806                 if (!pcdev->max_height)
1807                         pcdev->max_height = 1920;
1808         }
1809
1810         base = devm_ioremap_resource(&pdev->dev, res);
1811         if (IS_ERR(base))
1812                 return PTR_ERR(base);
1813
1814         pcdev->irq = irq;
1815         pcdev->base = base;
1816         pcdev->video_limit = 0; /* only enabled if second resource exists */
1817
1818         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1819         if (res) {
1820                 err = dma_declare_coherent_memory(&pdev->dev, res->start,
1821                                                   res->start,
1822                                                   resource_size(res),
1823                                                   DMA_MEMORY_MAP |
1824                                                   DMA_MEMORY_EXCLUSIVE);
1825                 if (!err) {
1826                         dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
1827                         return -ENXIO;
1828                 }
1829
1830                 pcdev->video_limit = resource_size(res);
1831         }
1832
1833         /* request irq */
1834         err = devm_request_irq(&pdev->dev, pcdev->irq, sh_mobile_ceu_irq,
1835                                0, dev_name(&pdev->dev), pcdev);
1836         if (err) {
1837                 dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
1838                 goto exit_release_mem;
1839         }
1840
1841         pm_suspend_ignore_children(&pdev->dev, true);
1842         pm_runtime_enable(&pdev->dev);
1843         pm_runtime_resume(&pdev->dev);
1844
1845         pcdev->ici.priv = pcdev;
1846         pcdev->ici.v4l2_dev.dev = &pdev->dev;
1847         pcdev->ici.nr = pdev->id;
1848         pcdev->ici.drv_name = dev_name(&pdev->dev);
1849         pcdev->ici.ops = &sh_mobile_ceu_host_ops;
1850         pcdev->ici.capabilities = SOCAM_HOST_CAP_STRIDE;
1851
1852         pcdev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
1853         if (IS_ERR(pcdev->alloc_ctx)) {
1854                 err = PTR_ERR(pcdev->alloc_ctx);
1855                 goto exit_free_clk;
1856         }
1857
1858         if (pcdev->pdata && pcdev->pdata->asd_sizes) {
1859                 struct v4l2_async_subdev **asd;
1860                 char name[] = "sh-mobile-csi2";
1861                 int j;
1862
1863                 /*
1864                  * CSI2 interfacing: several groups can use CSI2, pick up the
1865                  * first one
1866                  */
1867                 asd = pcdev->pdata->asd;
1868                 for (j = 0; pcdev->pdata->asd_sizes[j]; j++) {
1869                         for (i = 0; i < pcdev->pdata->asd_sizes[j]; i++, asd++) {
1870                                 dev_dbg(&pdev->dev, "%s(): subdev #%d, type %u\n",
1871                                         __func__, i, (*asd)->match_type);
1872                                 if ((*asd)->match_type == V4L2_ASYNC_MATCH_DEVNAME &&
1873                                     !strncmp(name, (*asd)->match.device_name.name,
1874                                              sizeof(name) - 1)) {
1875                                         pcdev->csi2_asd = *asd;
1876                                         break;
1877                                 }
1878                         }
1879                         if (pcdev->csi2_asd)
1880                                 break;
1881                 }
1882
1883                 pcdev->ici.asd = pcdev->pdata->asd;
1884                 pcdev->ici.asd_sizes = pcdev->pdata->asd_sizes;
1885         }
1886
1887         /* Legacy CSI2 interfacing */
1888         csi2 = pcdev->pdata ? pcdev->pdata->csi2 : NULL;
1889         if (csi2) {
1890                 /*
1891                  * TODO: remove this once all users are converted to
1892                  * asynchronous CSI2 probing. If it has to be kept, csi2
1893                  * platform device resources have to be added, using
1894                  * platform_device_add_resources()
1895                  */
1896                 struct platform_device *csi2_pdev =
1897                         platform_device_alloc("sh-mobile-csi2", csi2->id);
1898                 struct sh_csi2_pdata *csi2_pdata = csi2->platform_data;
1899
1900                 if (!csi2_pdev) {
1901                         err = -ENOMEM;
1902                         goto exit_free_ctx;
1903                 }
1904
1905                 pcdev->csi2_pdev                = csi2_pdev;
1906
1907                 err = platform_device_add_data(csi2_pdev, csi2_pdata,
1908                                                sizeof(*csi2_pdata));
1909                 if (err < 0)
1910                         goto exit_pdev_put;
1911
1912                 csi2_pdev->resource             = csi2->resource;
1913                 csi2_pdev->num_resources        = csi2->num_resources;
1914
1915                 err = platform_device_add(csi2_pdev);
1916                 if (err < 0)
1917                         goto exit_pdev_put;
1918
1919                 wait.dev = &csi2_pdev->dev;
1920
1921                 err = bus_register_notifier(&platform_bus_type, &wait.notifier);
1922                 if (err < 0)
1923                         goto exit_pdev_unregister;
1924
1925                 /*
1926                  * From this point the driver module will not unload, until
1927                  * we complete the completion.
1928                  */
1929
1930                 if (!csi2_pdev->dev.driver) {
1931                         complete(&wait.completion);
1932                         /* Either too late, or probing failed */
1933                         bus_unregister_notifier(&platform_bus_type, &wait.notifier);
1934                         err = -ENXIO;
1935                         goto exit_pdev_unregister;
1936                 }
1937
1938                 /*
1939                  * The module is still loaded, in the worst case it is hanging
1940                  * in device release on our completion. So, _now_ dereferencing
1941                  * the "owner" is safe!
1942                  */
1943
1944                 err = try_module_get(csi2_pdev->dev.driver->owner);
1945
1946                 /* Let notifier complete, if it has been locked */
1947                 complete(&wait.completion);
1948                 bus_unregister_notifier(&platform_bus_type, &wait.notifier);
1949                 if (!err) {
1950                         err = -ENODEV;
1951                         goto exit_pdev_unregister;
1952                 }
1953
1954                 pcdev->csi2_sd = platform_get_drvdata(csi2_pdev);
1955         }
1956
1957         err = soc_camera_host_register(&pcdev->ici);
1958         if (err)
1959                 goto exit_csi2_unregister;
1960
1961         if (csi2) {
1962                 err = v4l2_device_register_subdev(&pcdev->ici.v4l2_dev,
1963                                                   pcdev->csi2_sd);
1964                 dev_dbg(&pdev->dev, "%s(): ret(register_subdev) = %d\n",
1965                         __func__, err);
1966                 if (err < 0)
1967                         goto exit_host_unregister;
1968                 /* v4l2_device_register_subdev() took a reference too */
1969                 module_put(pcdev->csi2_sd->owner);
1970         }
1971
1972         return 0;
1973
1974 exit_host_unregister:
1975         soc_camera_host_unregister(&pcdev->ici);
1976 exit_csi2_unregister:
1977         if (csi2) {
1978                 module_put(pcdev->csi2_pdev->dev.driver->owner);
1979 exit_pdev_unregister:
1980                 platform_device_del(pcdev->csi2_pdev);
1981 exit_pdev_put:
1982                 pcdev->csi2_pdev->resource = NULL;
1983                 platform_device_put(pcdev->csi2_pdev);
1984         }
1985 exit_free_ctx:
1986         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
1987 exit_free_clk:
1988         pm_runtime_disable(&pdev->dev);
1989 exit_release_mem:
1990         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
1991                 dma_release_declared_memory(&pdev->dev);
1992         return err;
1993 }
1994
1995 static int sh_mobile_ceu_remove(struct platform_device *pdev)
1996 {
1997         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
1998         struct sh_mobile_ceu_dev *pcdev = container_of(soc_host,
1999                                         struct sh_mobile_ceu_dev, ici);
2000         struct platform_device *csi2_pdev = pcdev->csi2_pdev;
2001
2002         soc_camera_host_unregister(soc_host);
2003         pm_runtime_disable(&pdev->dev);
2004         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
2005                 dma_release_declared_memory(&pdev->dev);
2006         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
2007         if (csi2_pdev && csi2_pdev->dev.driver) {
2008                 struct module *csi2_drv = csi2_pdev->dev.driver->owner;
2009                 platform_device_del(csi2_pdev);
2010                 csi2_pdev->resource = NULL;
2011                 platform_device_put(csi2_pdev);
2012                 module_put(csi2_drv);
2013         }
2014
2015         return 0;
2016 }
2017
2018 static int sh_mobile_ceu_runtime_nop(struct device *dev)
2019 {
2020         /* Runtime PM callback shared between ->runtime_suspend()
2021          * and ->runtime_resume(). Simply returns success.
2022          *
2023          * This driver re-initializes all registers after
2024          * pm_runtime_get_sync() anyway so there is no need
2025          * to save and restore registers here.
2026          */
2027         return 0;
2028 }
2029
2030 static const struct dev_pm_ops sh_mobile_ceu_dev_pm_ops = {
2031         .runtime_suspend = sh_mobile_ceu_runtime_nop,
2032         .runtime_resume = sh_mobile_ceu_runtime_nop,
2033 };
2034
2035 static const struct of_device_id sh_mobile_ceu_of_match[] = {
2036         { .compatible = "renesas,sh-mobile-ceu" },
2037         { }
2038 };
2039 MODULE_DEVICE_TABLE(of, sh_mobile_ceu_of_match);
2040
2041 static struct platform_driver sh_mobile_ceu_driver = {
2042         .driver         = {
2043                 .name   = "sh_mobile_ceu",
2044                 .pm     = &sh_mobile_ceu_dev_pm_ops,
2045                 .of_match_table = sh_mobile_ceu_of_match,
2046         },
2047         .probe          = sh_mobile_ceu_probe,
2048         .remove         = sh_mobile_ceu_remove,
2049 };
2050
2051 static int __init sh_mobile_ceu_init(void)
2052 {
2053         /* Whatever return code */
2054         request_module("sh_mobile_csi2");
2055         return platform_driver_register(&sh_mobile_ceu_driver);
2056 }
2057
2058 static void __exit sh_mobile_ceu_exit(void)
2059 {
2060         platform_driver_unregister(&sh_mobile_ceu_driver);
2061 }
2062
2063 module_init(sh_mobile_ceu_init);
2064 module_exit(sh_mobile_ceu_exit);
2065
2066 MODULE_DESCRIPTION("SuperH Mobile CEU driver");
2067 MODULE_AUTHOR("Magnus Damm");
2068 MODULE_LICENSE("GPL");
2069 MODULE_VERSION("0.1.0");
2070 MODULE_ALIAS("platform:sh_mobile_ceu");