SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/media/video/sh_mobile_ceu_camera.c

   1 /*
   2  * V4L2 Driver for SuperH Mobile CEU interface
   3  *
   4  * Copyright (C) 2008 Magnus Damm
   5  *
   6  * Based on V4L2 Driver for PXA camera host - "pxa_camera.c",
   7  *
   8  * Copyright (C) 2006, Sascha Hauer, Pengutronix
   9  * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  */
  16
  17 #include <linux/init.h>
  18 #include <linux/module.h>
  19 #include <linux/io.h>
  20 #include <linux/delay.h>
  21 #include <linux/dma-mapping.h>
  22 #include <linux/errno.h>
  23 #include <linux/fs.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/kernel.h>
  26 #include <linux/mm.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/time.h>
  29 #include <linux/version.h>
  30 #include <linux/device.h>
  31 #include <linux/platform_device.h>
  32 #include <linux/videodev2.h>
  33 #include <linux/pm_runtime.h>
  34 #include <linux/sched.h>
  35
  36 #include <media/v4l2-common.h>
  37 #include <media/v4l2-dev.h>
  38 #include <media/soc_camera.h>
  39 #include <media/sh_mobile_ceu.h>
  40 #include <media/videobuf-dma-contig.h>
  41
  42 /* register offsets for sh7722 / sh7723 */
  43
  44 #define CAPSR  0x00 /* Capture start register */
  45 #define CAPCR  0x04 /* Capture control register */
  46 #define CAMCR  0x08 /* Capture interface control register */
  47 #define CMCYR  0x0c /* Capture interface cycle  register */
  48 #define CAMOR  0x10 /* Capture interface offset register */
  49 #define CAPWR  0x14 /* Capture interface width register */
  50 #define CAIFR  0x18 /* Capture interface input format register */
  51 #define CSTCR  0x20 /* Camera strobe control register (<= sh7722) */
  52 #define CSECR  0x24 /* Camera strobe emission count register (<= sh7722) */
  53 #define CRCNTR 0x28 /* CEU register control register */
  54 #define CRCMPR 0x2c /* CEU register forcible control register */
  55 #define CFLCR  0x30 /* Capture filter control register */
  56 #define CFSZR  0x34 /* Capture filter size clip register */
  57 #define CDWDR  0x38 /* Capture destination width register */
  58 #define CDAYR  0x3c /* Capture data address Y register */
  59 #define CDACR  0x40 /* Capture data address C register */
  60 #define CDBYR  0x44 /* Capture data bottom-field address Y register */
  61 #define CDBCR  0x48 /* Capture data bottom-field address C register */
  62 #define CBDSR  0x4c /* Capture bundle destination size register */
  63 #define CFWCR  0x5c /* Firewall operation control register */
  64 #define CLFCR  0x60 /* Capture low-pass filter control register */
  65 #define CDOCR  0x64 /* Capture data output control register */
  66 #define CDDCR  0x68 /* Capture data complexity level register */
  67 #define CDDAR  0x6c /* Capture data complexity level address register */
  68 #define CEIER  0x70 /* Capture event interrupt enable register */
  69 #define CETCR  0x74 /* Capture event flag clear register */
  70 #define CSTSR  0x7c /* Capture status register */
  71 #define CSRTR  0x80 /* Capture software reset register */
  72 #define CDSSR  0x84 /* Capture data size register */
  73 #define CDAYR2 0x90 /* Capture data address Y register 2 */
  74 #define CDACR2 0x94 /* Capture data address C register 2 */
  75 #define CDBYR2 0x98 /* Capture data bottom-field address Y register 2 */
  76 #define CDBCR2 0x9c /* Capture data bottom-field address C register 2 */
  77
  78 #undef DEBUG_GEOMETRY
  79 #ifdef DEBUG_GEOMETRY
  80 #define dev_geo dev_info
  81 #else
  82 #define dev_geo dev_dbg
  83 #endif
  84
  85 /* per video frame buffer */
  86 struct sh_mobile_ceu_buffer {
  87         struct videobuf_buffer vb; /* v4l buffer must be first */
  88         const struct soc_camera_data_format *fmt;
  89 };
  90
  91 struct sh_mobile_ceu_dev {
  92         struct soc_camera_host ici;
  93         struct soc_camera_device *icd;
  94
  95         unsigned int irq;
  96         void __iomem *base;
  97         unsigned long video_limit;
  98
  99         /* lock used to protect videobuf */
 100         spinlock_t lock;
 101         struct list_head capture;
 102         struct videobuf_buffer *active;
 103
 104         struct sh_mobile_ceu_info *pdata;
 105
 106         u32 cflcr;
 107
 108         unsigned int is_interlaced:1;
 109         unsigned int image_mode:1;
 110         unsigned int is_16bit:1;
 111 };
 112
 113 struct sh_mobile_ceu_cam {
 114         struct v4l2_rect ceu_rect;
 115         unsigned int cam_width;
 116         unsigned int cam_height;
 117         const struct soc_camera_data_format *extra_fmt;
 118         const struct soc_camera_data_format *camera_fmt;
 119 };
 120
 121 static unsigned long make_bus_param(struct sh_mobile_ceu_dev *pcdev)
 122 {
 123         unsigned long flags;
 124
 125         flags = SOCAM_MASTER |
 126                 SOCAM_PCLK_SAMPLE_RISING |
 127                 SOCAM_HSYNC_ACTIVE_HIGH |
 128                 SOCAM_HSYNC_ACTIVE_LOW |
 129                 SOCAM_VSYNC_ACTIVE_HIGH |
 130                 SOCAM_VSYNC_ACTIVE_LOW |
 131                 SOCAM_DATA_ACTIVE_HIGH;
 132
 133         if (pcdev->pdata->flags & SH_CEU_FLAG_USE_8BIT_BUS)
 134                 flags |= SOCAM_DATAWIDTH_8;
 135
 136         if (pcdev->pdata->flags & SH_CEU_FLAG_USE_16BIT_BUS)
 137                 flags |= SOCAM_DATAWIDTH_16;
 138
 139         if (flags & SOCAM_DATAWIDTH_MASK)
 140                 return flags;
 141
 142         return 0;
 143 }
 144
 145 static void ceu_write(struct sh_mobile_ceu_dev *priv,
 146                       unsigned long reg_offs, u32 data)
 147 {
 148         iowrite32(data, priv->base + reg_offs);
 149 }
 150
 151 static u32 ceu_read(struct sh_mobile_ceu_dev *priv, unsigned long reg_offs)
 152 {
 153         return ioread32(priv->base + reg_offs);
 154 }
 155
 156 static int sh_mobile_ceu_soft_reset(struct sh_mobile_ceu_dev *pcdev)
 157 {
 158         int i, success = 0;
 159         struct soc_camera_device *icd = pcdev->icd;
 160
 161         ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
 162
 163         /* wait CSTSR.CPTON bit */
 164         for (i = 0; i < 1000; i++) {
 165                 if (!(ceu_read(pcdev, CSTSR) & 1)) {
 166                         success++;
 167                         break;
 168                 }
 169                 udelay(1);
 170         }
 171
 172         /* wait CAPSR.CPKIL bit */
 173         for (i = 0; i < 1000; i++) {
 174                 if (!(ceu_read(pcdev, CAPSR) & (1 << 16))) {
 175                         success++;
 176                         break;
 177                 }
 178                 udelay(1);
 179         }
 180
 181
 182         if (2 != success) {
 183                 dev_warn(&icd->dev, "soft reset time out\n");
 184                 return -EIO;
 185         }
 186
 187         return 0;
 188 }
 189
 190 /*
 191  *  Videobuf operations
 192  */
 193 static int sh_mobile_ceu_videobuf_setup(struct videobuf_queue *vq,
 194                                         unsigned int *count,
 195                                         unsigned int *size)
 196 {
 197         struct soc_camera_device *icd = vq->priv_data;
 198         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 199         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 200         int bytes_per_pixel = (icd->current_fmt->depth + 7) >> 3;
 201
 202         *size = PAGE_ALIGN(icd->user_width * icd->user_height *
 203                            bytes_per_pixel);
 204
 205         if (0 == *count)
 206                 *count = 2;
 207
 208         if (pcdev->video_limit) {
 209                 while (*size * *count > pcdev->video_limit)
 210                         (*count)--;
 211         }
 212
 213         dev_dbg(icd->dev.parent, "count=%d, size=%d\n", *count, *size);
 214
 215         return 0;
 216 }
 217
 218 static void free_buffer(struct videobuf_queue *vq,
 219                         struct sh_mobile_ceu_buffer *buf)
 220 {
 221         struct soc_camera_device *icd = vq->priv_data;
 222         struct device *dev = icd->dev.parent;
 223
 224         dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
 225                 &buf->vb, buf->vb.baddr, buf->vb.bsize);
 226
 227         if (in_interrupt())
 228                 BUG();
 229
 230         videobuf_waiton(&buf->vb, 0, 0);
 231         videobuf_dma_contig_free(vq, &buf->vb);
 232         dev_dbg(dev, "%s freed\n", __func__);
 233         buf->vb.state = VIDEOBUF_NEEDS_INIT;
 234 }
 235
 236 #define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */
 237 #define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */
 238 #define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */
 239 #define CEU_CEIER_VBP   (1 << 20) /* vbp error */
 240 #define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */
 241 #define CEU_CEIER_MASK (CEU_CEIER_CPEIE | CEU_CEIER_VBP)
 242
 243
 244 /*
 245  * return value doesn't reflex the success/failure to queue the new buffer,
 246  * but rather the status of the previous buffer.
 247  */
 248 static int sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
 249 {
 250         struct soc_camera_device *icd = pcdev->icd;
 251         dma_addr_t phys_addr_top, phys_addr_bottom;
 252         u32 status;
 253         int ret = 0;
 254
 255         /*
 256          * The hardware is _very_ picky about this sequence. Especially
 257          * the CEU_CETCR_MAGIC value. It seems like we need to acknowledge
 258          * several not-so-well documented interrupt sources in CETCR.
 259          */
 260         ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_MASK);
 261         status = ceu_read(pcdev, CETCR);
 262         ceu_write(pcdev, CETCR, ~status & CEU_CETCR_MAGIC);
 263         ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_MASK);
 264         ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP);
 265         ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW);
 266
 267         /*
 268          * When a VBP interrupt occurs, a capture end interrupt does not occur
 269          * and the image of that frame is not captured correctly. So, soft reset
 270          * is needed here.
 271          */
 272         if (status & CEU_CEIER_VBP) {
 273                 sh_mobile_ceu_soft_reset(pcdev);
 274                 ret = -EIO;
 275         }
 276
 277         if (!pcdev->active)
 278                 return ret;
 279
 280         phys_addr_top = videobuf_to_dma_contig(pcdev->active);
 281         ceu_write(pcdev, CDAYR, phys_addr_top);
 282         if (pcdev->is_interlaced) {
 283                 phys_addr_bottom = phys_addr_top + icd->user_width;
 284                 ceu_write(pcdev, CDBYR, phys_addr_bottom);
 285         }
 286
 287         switch (icd->current_fmt->fourcc) {
 288         case V4L2_PIX_FMT_NV12:
 289         case V4L2_PIX_FMT_NV21:
 290         case V4L2_PIX_FMT_NV16:
 291         case V4L2_PIX_FMT_NV61:
 292                 phys_addr_top += icd->user_width *
 293                         icd->user_height;
 294                 ceu_write(pcdev, CDACR, phys_addr_top);
 295                 if (pcdev->is_interlaced) {
 296                         phys_addr_bottom = phys_addr_top +
 297                                 icd->user_width;
 298                         ceu_write(pcdev, CDBCR, phys_addr_bottom);
 299                 }
 300         }
 301
 302         pcdev->active->state = VIDEOBUF_ACTIVE;
 303         ceu_write(pcdev, CAPSR, 0x1); /* start capture */
 304
 305         return ret;
 306 }
 307
 308 static int sh_mobile_ceu_videobuf_prepare(struct videobuf_queue *vq,
 309                                           struct videobuf_buffer *vb,
 310                                           enum v4l2_field field)
 311 {
 312         struct soc_camera_device *icd = vq->priv_data;
 313         struct sh_mobile_ceu_buffer *buf;
 314         int ret;
 315
 316         buf = container_of(vb, struct sh_mobile_ceu_buffer, vb);
 317
 318         dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
 319                 vb, vb->baddr, vb->bsize);
 320
 321         /* Added list head initialization on alloc */
 322         WARN_ON(!list_empty(&vb->queue));
 323
 324 #ifdef DEBUG
 325         /*
 326          * This can be useful if you want to see if we actually fill
 327          * the buffer with something
 328          */
 329         memset((void *)vb->baddr, 0xaa, vb->bsize);
 330 #endif
 331
 332         BUG_ON(NULL == icd->current_fmt);
 333
 334         if (buf->fmt    != icd->current_fmt ||
 335             vb->width   != icd->user_width ||
 336             vb->height  != icd->user_height ||
 337             vb->field   != field) {
 338                 buf->fmt        = icd->current_fmt;
 339                 vb->width       = icd->user_width;
 340                 vb->height      = icd->user_height;
 341                 vb->field       = field;
 342                 vb->state       = VIDEOBUF_NEEDS_INIT;
 343         }
 344
 345         vb->size = vb->width * vb->height * ((buf->fmt->depth + 7) >> 3);
 346         if (0 != vb->baddr && vb->bsize < vb->size) {
 347                 ret = -EINVAL;
 348                 goto out;
 349         }
 350
 351         if (vb->state == VIDEOBUF_NEEDS_INIT) {
 352                 ret = videobuf_iolock(vq, vb, NULL);
 353                 if (ret)
 354                         goto fail;
 355                 vb->state = VIDEOBUF_PREPARED;
 356         }
 357
 358         return 0;
 359 fail:
 360         free_buffer(vq, buf);
 361 out:
 362         return ret;
 363 }
 364
 365 /* Called under spinlock_irqsave(&pcdev->lock, ...) */
 366 static void sh_mobile_ceu_videobuf_queue(struct videobuf_queue *vq,
 367                                          struct videobuf_buffer *vb)
 368 {
 369         struct soc_camera_device *icd = vq->priv_data;
 370         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 371         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 372
 373         dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
 374                 vb, vb->baddr, vb->bsize);
 375
 376         vb->state = VIDEOBUF_QUEUED;
 377         list_add_tail(&vb->queue, &pcdev->capture);
 378
 379         if (!pcdev->active) {
 380                 /*
 381                  * Because there were no active buffer at this moment,
 382                  * we are not interested in the return value of
 383                  * sh_mobile_ceu_capture here.
 384                  */
 385                 pcdev->active = vb;
 386                 sh_mobile_ceu_capture(pcdev);
 387         }
 388 }
 389
 390 static void sh_mobile_ceu_videobuf_release(struct videobuf_queue *vq,
 391                                            struct videobuf_buffer *vb)
 392 {
 393         struct soc_camera_device *icd = vq->priv_data;
 394         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 395         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 396         unsigned long flags;
 397
 398         spin_lock_irqsave(&pcdev->lock, flags);
 399
 400         if (pcdev->active == vb) {
 401                 /* disable capture (release DMA buffer), reset */
 402                 ceu_write(pcdev, CAPSR, 1 << 16);
 403                 pcdev->active = NULL;
 404         }
 405
 406         if ((vb->state == VIDEOBUF_ACTIVE || vb->state == VIDEOBUF_QUEUED) &&
 407             !list_empty(&vb->queue)) {
 408                 vb->state = VIDEOBUF_ERROR;
 409                 list_del_init(&vb->queue);
 410         }
 411
 412         spin_unlock_irqrestore(&pcdev->lock, flags);
 413
 414         free_buffer(vq, container_of(vb, struct sh_mobile_ceu_buffer, vb));
 415 }
 416
 417 static struct videobuf_queue_ops sh_mobile_ceu_videobuf_ops = {
 418         .buf_setup      = sh_mobile_ceu_videobuf_setup,
 419         .buf_prepare    = sh_mobile_ceu_videobuf_prepare,
 420         .buf_queue      = sh_mobile_ceu_videobuf_queue,
 421         .buf_release    = sh_mobile_ceu_videobuf_release,
 422 };
 423
 424 static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
 425 {
 426         struct sh_mobile_ceu_dev *pcdev = data;
 427         struct videobuf_buffer *vb;
 428         unsigned long flags;
 429
 430         spin_lock_irqsave(&pcdev->lock, flags);
 431
 432         vb = pcdev->active;
 433         if (!vb)
 434                 /* Stale interrupt from a released buffer */
 435                 goto out;
 436
 437         list_del_init(&vb->queue);
 438
 439         if (!list_empty(&pcdev->capture))
 440                 pcdev->active = list_entry(pcdev->capture.next,
 441                                            struct videobuf_buffer, queue);
 442         else
 443                 pcdev->active = NULL;
 444
 445         vb->state = (sh_mobile_ceu_capture(pcdev) < 0) ?
 446                 VIDEOBUF_ERROR : VIDEOBUF_DONE;
 447         do_gettimeofday(&vb->ts);
 448         vb->field_count++;
 449         wake_up(&vb->done);
 450
 451 out:
 452         spin_unlock_irqrestore(&pcdev->lock, flags);
 453
 454         return IRQ_HANDLED;
 455 }
 456
 457 /* Called with .video_lock held */
 458 static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
 459 {
 460         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 461         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 462
 463         if (pcdev->icd)
 464                 return -EBUSY;
 465
 466         dev_info(icd->dev.parent,
 467                  "SuperH Mobile CEU driver attached to camera %d\n",
 468                  icd->devnum);
 469
 470         pm_runtime_get_sync(ici->v4l2_dev.dev);
 471
 472         pcdev->icd = icd;
 473
 474         return sh_mobile_ceu_soft_reset(pcdev);
 475 }
 476
 477 /* Called with .video_lock held */
 478 static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
 479 {
 480         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 481         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 482         unsigned long flags;
 483
 484         BUG_ON(icd != pcdev->icd);
 485
 486         /* disable capture, disable interrupts */
 487         ceu_write(pcdev, CEIER, 0);
 488         sh_mobile_ceu_soft_reset(pcdev);
 489
 490         /* make sure active buffer is canceled */
 491         spin_lock_irqsave(&pcdev->lock, flags);
 492         if (pcdev->active) {
 493                 list_del(&pcdev->active->queue);
 494                 pcdev->active->state = VIDEOBUF_ERROR;
 495                 wake_up_all(&pcdev->active->done);
 496                 pcdev->active = NULL;
 497         }
 498         spin_unlock_irqrestore(&pcdev->lock, flags);
 499
 500         pm_runtime_put_sync(ici->v4l2_dev.dev);
 501
 502         dev_info(icd->dev.parent,
 503                  "SuperH Mobile CEU driver detached from camera %d\n",
 504                  icd->devnum);
 505
 506         pcdev->icd = NULL;
 507 }
 508
 509 /*
 510  * See chapter 29.4.12 "Capture Filter Control Register (CFLCR)"
 511  * in SH7722 Hardware Manual
 512  */
 513 static unsigned int size_dst(unsigned int src, unsigned int scale)
 514 {
 515         unsigned int mant_pre = scale >> 12;
 516         if (!src || !scale)
 517                 return src;
 518         return ((mant_pre + 2 * (src - 1)) / (2 * mant_pre) - 1) *
 519                 mant_pre * 4096 / scale + 1;
 520 }
 521
 522 static u16 calc_scale(unsigned int src, unsigned int *dst)
 523 {
 524         u16 scale;
 525
 526         if (src == *dst)
 527                 return 0;
 528
 529         scale = (src * 4096 / *dst) & ~7;
 530
 531         while (scale > 4096 && size_dst(src, scale) < *dst)
 532                 scale -= 8;
 533
 534         *dst = size_dst(src, scale);
 535
 536         return scale;
 537 }
 538
 539 /* rect is guaranteed to not exceed the scaled camera rectangle */
 540 static void sh_mobile_ceu_set_rect(struct soc_camera_device *icd,
 541                                    unsigned int out_width,
 542                                    unsigned int out_height)
 543 {
 544         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 545         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 546         struct v4l2_rect *rect = &cam->ceu_rect;
 547         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 548         unsigned int height, width, cdwdr_width, in_width, in_height;
 549         unsigned int left_offset, top_offset;
 550         u32 camor;
 551
 552         dev_dbg(icd->dev.parent, "Crop %ux%u@%u:%u\n",
 553                 rect->width, rect->height, rect->left, rect->top);
 554
 555         left_offset     = rect->left;
 556         top_offset      = rect->top;
 557
 558         if (pcdev->image_mode) {
 559                 in_width = rect->width;
 560                 if (!pcdev->is_16bit) {
 561                         in_width *= 2;
 562                         left_offset *= 2;
 563                 }
 564                 width = cdwdr_width = out_width;
 565         } else {
 566                 unsigned int w_factor = (icd->current_fmt->depth + 7) >> 3;
 567
 568                 width = out_width * w_factor / 2;
 569
 570                 if (!pcdev->is_16bit)
 571                         w_factor *= 2;
 572
 573                 in_width = rect->width * w_factor / 2;
 574                 left_offset = left_offset * w_factor / 2;
 575
 576                 cdwdr_width = width * 2;
 577         }
 578
 579         height = out_height;
 580         in_height = rect->height;
 581         if (pcdev->is_interlaced) {
 582                 height /= 2;
 583                 in_height /= 2;
 584                 top_offset /= 2;
 585                 cdwdr_width *= 2;
 586         }
 587
 588         /* Set CAMOR, CAPWR, CFSZR, take care of CDWDR */
 589         camor = left_offset | (top_offset << 16);
 590
 591         dev_geo(icd->dev.parent,
 592                 "CAMOR 0x%x, CAPWR 0x%x, CFSZR 0x%x, CDWDR 0x%x\n", camor,
 593                 (in_height << 16) | in_width, (height << 16) | width,
 594                 cdwdr_width);
 595
 596         ceu_write(pcdev, CAMOR, camor);
 597         ceu_write(pcdev, CAPWR, (in_height << 16) | in_width);
 598         ceu_write(pcdev, CFSZR, (height << 16) | width);
 599         ceu_write(pcdev, CDWDR, cdwdr_width);
 600 }
 601
 602 static u32 capture_save_reset(struct sh_mobile_ceu_dev *pcdev)
 603 {
 604         u32 capsr = ceu_read(pcdev, CAPSR);
 605         ceu_write(pcdev, CAPSR, 1 << 16); /* reset, stop capture */
 606         return capsr;
 607 }
 608
 609 static void capture_restore(struct sh_mobile_ceu_dev *pcdev, u32 capsr)
 610 {
 611         unsigned long timeout = jiffies + 10 * HZ;
 612
 613         /*
 614          * Wait until the end of the current frame. It can take a long time,
 615          * but if it has been aborted by a CAPSR reset, it shoule exit sooner.
 616          */
 617         while ((ceu_read(pcdev, CSTSR) & 1) && time_before(jiffies, timeout))
 618                 msleep(1);
 619
 620         if (time_after(jiffies, timeout)) {
 621                 dev_err(pcdev->ici.v4l2_dev.dev,
 622                         "Timeout waiting for frame end! Interface problem?\n");
 623                 return;
 624         }
 625
 626         /* Wait until reset clears, this shall not hang... */
 627         while (ceu_read(pcdev, CAPSR) & (1 << 16))
 628                 udelay(10);
 629
 630         /* Anything to restore? */
 631         if (capsr & ~(1 << 16))
 632                 ceu_write(pcdev, CAPSR, capsr);
 633 }
 634
 635 static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
 636                                        __u32 pixfmt)
 637 {
 638         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 639         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 640         int ret;
 641         unsigned long camera_flags, common_flags, value;
 642         int yuv_lineskip;
 643         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 644         u32 capsr = capture_save_reset(pcdev);
 645
 646         camera_flags = icd->ops->query_bus_param(icd);
 647         common_flags = soc_camera_bus_param_compatible(camera_flags,
 648                                                        make_bus_param(pcdev));
 649         if (!common_flags)
 650                 return -EINVAL;
 651
 652         ret = icd->ops->set_bus_param(icd, common_flags);
 653         if (ret < 0)
 654                 return ret;
 655
 656         switch (common_flags & SOCAM_DATAWIDTH_MASK) {
 657         case SOCAM_DATAWIDTH_8:
 658                 pcdev->is_16bit = 0;
 659                 break;
 660         case SOCAM_DATAWIDTH_16:
 661                 pcdev->is_16bit = 1;
 662                 break;
 663         default:
 664                 return -EINVAL;
 665         }
 666
 667         ceu_write(pcdev, CRCNTR, 0);
 668         ceu_write(pcdev, CRCMPR, 0);
 669
 670         value = 0x00000010; /* data fetch by default */
 671         yuv_lineskip = 0;
 672
 673         switch (icd->current_fmt->fourcc) {
 674         case V4L2_PIX_FMT_NV12:
 675         case V4L2_PIX_FMT_NV21:
 676                 yuv_lineskip = 1; /* skip for NV12/21, no skip for NV16/61 */
 677                 /* fall-through */
 678         case V4L2_PIX_FMT_NV16:
 679         case V4L2_PIX_FMT_NV61:
 680                 switch (cam->camera_fmt->fourcc) {
 681                 case V4L2_PIX_FMT_UYVY:
 682                         value = 0x00000000; /* Cb0, Y0, Cr0, Y1 */
 683                         break;
 684                 case V4L2_PIX_FMT_VYUY:
 685                         value = 0x00000100; /* Cr0, Y0, Cb0, Y1 */
 686                         break;
 687                 case V4L2_PIX_FMT_YUYV:
 688                         value = 0x00000200; /* Y0, Cb0, Y1, Cr0 */
 689                         break;
 690                 case V4L2_PIX_FMT_YVYU:
 691                         value = 0x00000300; /* Y0, Cr0, Y1, Cb0 */
 692                         break;
 693                 default:
 694                         BUG();
 695                 }
 696         }
 697
 698         if (icd->current_fmt->fourcc == V4L2_PIX_FMT_NV21 ||
 699             icd->current_fmt->fourcc == V4L2_PIX_FMT_NV61)
 700                 value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */
 701
 702         value |= common_flags & SOCAM_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
 703         value |= common_flags & SOCAM_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
 704         value |= pcdev->is_16bit ? 1 << 12 : 0;
 705         ceu_write(pcdev, CAMCR, value);
 706
 707         ceu_write(pcdev, CAPCR, 0x00300000);
 708         ceu_write(pcdev, CAIFR, pcdev->is_interlaced ? 0x101 : 0);
 709
 710         sh_mobile_ceu_set_rect(icd, icd->user_width, icd->user_height);
 711         mdelay(1);
 712
 713         ceu_write(pcdev, CFLCR, pcdev->cflcr);
 714
 715         /*
 716          * A few words about byte order (observed in Big Endian mode)
 717          *
 718          * In data fetch mode bytes are received in chunks of 8 bytes.
 719          * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
 720          *
 721          * The data is however by default written to memory in reverse order:
 722          * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
 723          *
 724          * The lowest three bits of CDOCR allows us to do swapping,
 725          * using 7 we swap the data bytes to match the incoming order:
 726          * D0, D1, D2, D3, D4, D5, D6, D7
 727          */
 728         value = 0x00000017;
 729         if (yuv_lineskip)
 730                 value &= ~0x00000010; /* convert 4:2:2 -> 4:2:0 */
 731
 732         ceu_write(pcdev, CDOCR, value);
 733         ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
 734
 735         dev_dbg(icd->dev.parent, "S_FMT successful for %c%c%c%c %ux%u\n",
 736                 pixfmt & 0xff, (pixfmt >> 8) & 0xff,
 737                 (pixfmt >> 16) & 0xff, (pixfmt >> 24) & 0xff,
 738                 icd->user_width, icd->user_height);
 739
 740         capture_restore(pcdev, capsr);
 741
 742         /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
 743         return 0;
 744 }
 745
 746 static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd)
 747 {
 748         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 749         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 750         unsigned long camera_flags, common_flags;
 751
 752         camera_flags = icd->ops->query_bus_param(icd);
 753         common_flags = soc_camera_bus_param_compatible(camera_flags,
 754                                                        make_bus_param(pcdev));
 755         if (!common_flags)
 756                 return -EINVAL;
 757
 758         return 0;
 759 }
 760
 761 static const struct soc_camera_data_format sh_mobile_ceu_formats[] = {
 762         {
 763                 .name           = "NV12",
 764                 .depth          = 12,
 765                 .fourcc         = V4L2_PIX_FMT_NV12,
 766                 .colorspace     = V4L2_COLORSPACE_JPEG,
 767         },
 768         {
 769                 .name           = "NV21",
 770                 .depth          = 12,
 771                 .fourcc         = V4L2_PIX_FMT_NV21,
 772                 .colorspace     = V4L2_COLORSPACE_JPEG,
 773         },
 774         {
 775                 .name           = "NV16",
 776                 .depth          = 16,
 777                 .fourcc         = V4L2_PIX_FMT_NV16,
 778                 .colorspace     = V4L2_COLORSPACE_JPEG,
 779         },
 780         {
 781                 .name           = "NV61",
 782                 .depth          = 16,
 783                 .fourcc         = V4L2_PIX_FMT_NV61,
 784                 .colorspace     = V4L2_COLORSPACE_JPEG,
 785         },
 786 };
 787
 788 static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, int idx,
 789                                      struct soc_camera_format_xlate *xlate)
 790 {
 791         struct device *dev = icd->dev.parent;
 792         int ret, k, n;
 793         int formats = 0;
 794         struct sh_mobile_ceu_cam *cam;
 795
 796         ret = sh_mobile_ceu_try_bus_param(icd);
 797         if (ret < 0)
 798                 return 0;
 799
 800         if (!icd->host_priv) {
 801                 cam = kzalloc(sizeof(*cam), GFP_KERNEL);
 802                 if (!cam)
 803                         return -ENOMEM;
 804
 805                 icd->host_priv = cam;
 806         } else {
 807                 cam = icd->host_priv;
 808         }
 809
 810         /* Beginning of a pass */
 811         if (!idx)
 812                 cam->extra_fmt = NULL;
 813
 814         switch (icd->formats[idx].fourcc) {
 815         case V4L2_PIX_FMT_UYVY:
 816         case V4L2_PIX_FMT_VYUY:
 817         case V4L2_PIX_FMT_YUYV:
 818         case V4L2_PIX_FMT_YVYU:
 819                 if (cam->extra_fmt)
 820                         goto add_single_format;
 821
 822                 /*
 823                  * Our case is simple so far: for any of the above four camera
 824                  * formats we add all our four synthesized NV* formats, so,
 825                  * just marking the device with a single flag suffices. If
 826                  * the format generation rules are more complex, you would have
 827                  * to actually hang your already added / counted formats onto
 828                  * the host_priv pointer and check whether the format you're
 829                  * going to add now is already there.
 830                  */
 831                 cam->extra_fmt = (void *)sh_mobile_ceu_formats;
 832
 833                 n = ARRAY_SIZE(sh_mobile_ceu_formats);
 834                 formats += n;
 835                 for (k = 0; xlate && k < n; k++) {
 836                         xlate->host_fmt = &sh_mobile_ceu_formats[k];
 837                         xlate->cam_fmt = icd->formats + idx;
 838                         xlate->buswidth = icd->formats[idx].depth;
 839                         xlate++;
 840                         dev_dbg(dev, "Providing format %s using %s\n",
 841                                 sh_mobile_ceu_formats[k].name,
 842                                 icd->formats[idx].name);
 843                 }
 844         default:
 845 add_single_format:
 846                 /* Generic pass-through */
 847                 formats++;
 848                 if (xlate) {
 849                         xlate->host_fmt = icd->formats + idx;
 850                         xlate->cam_fmt = icd->formats + idx;
 851                         xlate->buswidth = icd->formats[idx].depth;
 852                         xlate++;
 853                         dev_dbg(dev,
 854                                 "Providing format %s in pass-through mode\n",
 855                                 icd->formats[idx].name);
 856                 }
 857         }
 858
 859         return formats;
 860 }
 861
 862 static void sh_mobile_ceu_put_formats(struct soc_camera_device *icd)
 863 {
 864         kfree(icd->host_priv);
 865         icd->host_priv = NULL;
 866 }
 867
 868 /* Check if any dimension of r1 is smaller than respective one of r2 */
 869 static bool is_smaller(struct v4l2_rect *r1, struct v4l2_rect *r2)
 870 {
 871         return r1->width < r2->width || r1->height < r2->height;
 872 }
 873
 874 /* Check if r1 fails to cover r2 */
 875 static bool is_inside(struct v4l2_rect *r1, struct v4l2_rect *r2)
 876 {
 877         return r1->left > r2->left || r1->top > r2->top ||
 878                 r1->left + r1->width < r2->left + r2->width ||
 879                 r1->top + r1->height < r2->top + r2->height;
 880 }
 881
 882 static unsigned int scale_down(unsigned int size, unsigned int scale)
 883 {
 884         return (size * 4096 + scale / 2) / scale;
 885 }
 886
 887 static unsigned int scale_up(unsigned int size, unsigned int scale)
 888 {
 889         return (size * scale + 2048) / 4096;
 890 }
 891
 892 static unsigned int calc_generic_scale(unsigned int input, unsigned int output)
 893 {
 894         return (input * 4096 + output / 2) / output;
 895 }
 896
 897 static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect)
 898 {
 899         struct v4l2_crop crop;
 900         struct v4l2_cropcap cap;
 901         int ret;
 902
 903         crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 904
 905         ret = v4l2_subdev_call(sd, video, g_crop, &crop);
 906         if (!ret) {
 907                 *rect = crop.c;
 908                 return ret;
 909         }
 910
 911         /* Camera driver doesn't support .g_crop(), assume default rectangle */
 912         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 913
 914         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
 915         if (ret < 0)
 916                 return ret;
 917
 918         *rect = cap.defrect;
 919
 920         return ret;
 921 }
 922
 923 /*
 924  * The common for both scaling and cropping iterative approach is:
 925  * 1. try if the client can produce exactly what requested by the user
 926  * 2. if (1) failed, try to double the client image until we get one big enough
 927  * 3. if (2) failed, try to request the maximum image
 928  */
 929 static int client_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *crop,
 930                          struct v4l2_crop *cam_crop)
 931 {
 932         struct v4l2_rect *rect = &crop->c, *cam_rect = &cam_crop->c;
 933         struct device *dev = sd->v4l2_dev->dev;
 934         struct v4l2_cropcap cap;
 935         int ret;
 936         unsigned int width, height;
 937
 938         v4l2_subdev_call(sd, video, s_crop, crop);
 939         ret = client_g_rect(sd, cam_rect);
 940         if (ret < 0)
 941                 return ret;
 942
 943         /*
 944          * Now cam_crop contains the current camera input rectangle, and it must
 945          * be within camera cropcap bounds
 946          */
 947         if (!memcmp(rect, cam_rect, sizeof(*rect))) {
 948                 /* Even if camera S_CROP failed, but camera rectangle matches */
 949                 dev_dbg(dev, "Camera S_CROP successful for %ux%u@%u:%u\n",
 950                         rect->width, rect->height, rect->left, rect->top);
 951                 return 0;
 952         }
 953
 954         /* Try to fix cropping, that camera hasn't managed to set */
 955         dev_geo(dev, "Fix camera S_CROP for %ux%u@%u:%u to %ux%u@%u:%u\n",
 956                 cam_rect->width, cam_rect->height,
 957                 cam_rect->left, cam_rect->top,
 958                 rect->width, rect->height, rect->left, rect->top);
 959
 960         /* We need sensor maximum rectangle */
 961         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
 962         if (ret < 0)
 963                 return ret;
 964
 965         soc_camera_limit_side(&rect->left, &rect->width, cap.bounds.left, 2,
 966                               cap.bounds.width);
 967         soc_camera_limit_side(&rect->top, &rect->height, cap.bounds.top, 4,
 968                               cap.bounds.height);
 969
 970         /*
 971          * Popular special case - some cameras can only handle fixed sizes like
 972          * QVGA, VGA,... Take care to avoid infinite loop.
 973          */
 974         width = max(cam_rect->width, 2);
 975         height = max(cam_rect->height, 2);
 976
 977         while (!ret && (is_smaller(cam_rect, rect) ||
 978                         is_inside(cam_rect, rect)) &&
 979                (cap.bounds.width > width || cap.bounds.height > height)) {
 980
 981                 width *= 2;
 982                 height *= 2;
 983
 984                 cam_rect->width = width;
 985                 cam_rect->height = height;
 986
 987                 /*
 988                  * We do not know what capabilities the camera has to set up
 989                  * left and top borders. We could try to be smarter in iterating
 990                  * them, e.g., if camera current left is to the right of the
 991                  * target left, set it to the middle point between the current
 992                  * left and minimum left. But that would add too much
 993                  * complexity: we would have to iterate each border separately.
 994                  */
 995                 if (cam_rect->left > rect->left)
 996                         cam_rect->left = cap.bounds.left;
 997
 998                 if (cam_rect->left + cam_rect->width < rect->left + rect->width)
 999                         cam_rect->width = rect->left + rect->width -
1000                                 cam_rect->left;
1001
1002                 if (cam_rect->top > rect->top)
1003                         cam_rect->top = cap.bounds.top;
1004
1005                 if (cam_rect->top + cam_rect->height < rect->top + rect->height)
1006                         cam_rect->height = rect->top + rect->height -
1007                                 cam_rect->top;
1008
1009                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1010                 ret = client_g_rect(sd, cam_rect);
1011                 dev_geo(dev, "Camera S_CROP %d for %ux%u@%u:%u\n", ret,
1012                         cam_rect->width, cam_rect->height,
1013                         cam_rect->left, cam_rect->top);
1014         }
1015
1016         /* S_CROP must not modify the rectangle */
1017         if (is_smaller(cam_rect, rect) || is_inside(cam_rect, rect)) {
1018                 /*
1019                  * The camera failed to configure a suitable cropping,
1020                  * we cannot use the current rectangle, set to max
1021                  */
1022                 *cam_rect = cap.bounds;
1023                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1024                 ret = client_g_rect(sd, cam_rect);
1025                 dev_geo(dev, "Camera S_CROP %d for max %ux%u@%u:%u\n", ret,
1026                         cam_rect->width, cam_rect->height,
1027                         cam_rect->left, cam_rect->top);
1028         }
1029
1030         return ret;
1031 }
1032
1033 static int get_camera_scales(struct v4l2_subdev *sd, struct v4l2_rect *rect,
1034                              unsigned int *scale_h, unsigned int *scale_v)
1035 {
1036         struct v4l2_format f;
1037         int ret;
1038
1039         f.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1040
1041         ret = v4l2_subdev_call(sd, video, g_fmt, &f);
1042         if (ret < 0)
1043                 return ret;
1044
1045         *scale_h = calc_generic_scale(rect->width, f.fmt.pix.width);
1046         *scale_v = calc_generic_scale(rect->height, f.fmt.pix.height);
1047
1048         return 0;
1049 }
1050
1051 static int get_camera_subwin(struct soc_camera_device *icd,
1052                              struct v4l2_rect *cam_subrect,
1053                              unsigned int cam_hscale, unsigned int cam_vscale)
1054 {
1055         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1056         struct v4l2_rect *ceu_rect = &cam->ceu_rect;
1057
1058         if (!ceu_rect->width) {
1059                 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1060                 struct device *dev = icd->dev.parent;
1061                 struct v4l2_format f;
1062                 struct v4l2_pix_format *pix = &f.fmt.pix;
1063                 int ret;
1064                 /* First time */
1065
1066                 f.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1067
1068                 ret = v4l2_subdev_call(sd, video, g_fmt, &f);
1069                 if (ret < 0)
1070                         return ret;
1071
1072                 dev_geo(dev, "camera fmt %ux%u\n", pix->width, pix->height);
1073
1074                 if (pix->width > 2560) {
1075                         ceu_rect->width  = 2560;
1076                         ceu_rect->left   = (pix->width - 2560) / 2;
1077                 } else {
1078                         ceu_rect->width  = pix->width;
1079                         ceu_rect->left   = 0;
1080                 }
1081
1082                 if (pix->height > 1920) {
1083                         ceu_rect->height = 1920;
1084                         ceu_rect->top    = (pix->height - 1920) / 2;
1085                 } else {
1086                         ceu_rect->height = pix->height;
1087                         ceu_rect->top    = 0;
1088                 }
1089
1090                 dev_geo(dev, "initialised CEU rect %ux%u@%u:%u\n",
1091                         ceu_rect->width, ceu_rect->height,
1092                         ceu_rect->left, ceu_rect->top);
1093         }
1094
1095         cam_subrect->width      = scale_up(ceu_rect->width, cam_hscale);
1096         cam_subrect->left       = scale_up(ceu_rect->left, cam_hscale);
1097         cam_subrect->height     = scale_up(ceu_rect->height, cam_vscale);
1098         cam_subrect->top        = scale_up(ceu_rect->top, cam_vscale);
1099
1100         return 0;
1101 }
1102
1103 static int client_s_fmt(struct soc_camera_device *icd, struct v4l2_format *f,
1104                         bool ceu_can_scale)
1105 {
1106         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1107         struct device *dev = icd->dev.parent;
1108         struct v4l2_pix_format *pix = &f->fmt.pix;
1109         unsigned int width = pix->width, height = pix->height, tmp_w, tmp_h;
1110         unsigned int max_width, max_height;
1111         struct v4l2_cropcap cap;
1112         int ret;
1113
1114         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1115
1116         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1117         if (ret < 0)
1118                 return ret;
1119
1120         max_width = min(cap.bounds.width, 2560);
1121         max_height = min(cap.bounds.height, 1920);
1122
1123         ret = v4l2_subdev_call(sd, video, s_fmt, f);
1124         if (ret < 0)
1125                 return ret;
1126
1127         dev_geo(dev, "camera scaled to %ux%u\n", pix->width, pix->height);
1128
1129         if ((width == pix->width && height == pix->height) || !ceu_can_scale)
1130                 return 0;
1131
1132         /* Camera set a format, but geometry is not precise, try to improve */
1133         tmp_w = pix->width;
1134         tmp_h = pix->height;
1135
1136         /* width <= max_width && height <= max_height - guaranteed by try_fmt */
1137         while ((width > tmp_w || height > tmp_h) &&
1138                tmp_w < max_width && tmp_h < max_height) {
1139                 tmp_w = min(2 * tmp_w, max_width);
1140                 tmp_h = min(2 * tmp_h, max_height);
1141                 pix->width = tmp_w;
1142                 pix->height = tmp_h;
1143                 ret = v4l2_subdev_call(sd, video, s_fmt, f);
1144                 dev_geo(dev, "Camera scaled to %ux%u\n",
1145                         pix->width, pix->height);
1146                 if (ret < 0) {
1147                         /* This shouldn't happen */
1148                         dev_err(dev, "Client failed to set format: %d\n", ret);
1149                         return ret;
1150                 }
1151         }
1152
1153         return 0;
1154 }
1155
1156 /**
1157  * @rect        - camera cropped rectangle
1158  * @sub_rect    - CEU cropped rectangle, mapped back to camera input area
1159  * @ceu_rect    - on output calculated CEU crop rectangle
1160  */
1161 static int client_scale(struct soc_camera_device *icd, struct v4l2_rect *rect,
1162                         struct v4l2_rect *sub_rect, struct v4l2_rect *ceu_rect,
1163                         struct v4l2_format *f, bool ceu_can_scale)
1164 {
1165         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1166         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1167         struct device *dev = icd->dev.parent;
1168         struct v4l2_format f_tmp = *f;
1169         struct v4l2_pix_format *pix_tmp = &f_tmp.fmt.pix;
1170         unsigned int scale_h, scale_v;
1171         int ret;
1172
1173         /* 5. Apply iterative camera S_FMT for camera user window. */
1174         ret = client_s_fmt(icd, &f_tmp, ceu_can_scale);
1175         if (ret < 0)
1176                 return ret;
1177
1178         dev_geo(dev, "5: camera scaled to %ux%u\n",
1179                 pix_tmp->width, pix_tmp->height);
1180
1181         /* 6. Retrieve camera output window (g_fmt) */
1182
1183         /* unneeded - it is already in "f_tmp" */
1184
1185         /* 7. Calculate new camera scales. */
1186         ret = get_camera_scales(sd, rect, &scale_h, &scale_v);
1187         if (ret < 0)
1188                 return ret;
1189
1190         dev_geo(dev, "7: camera scales %u:%u\n", scale_h, scale_v);
1191
1192         cam->cam_width          = pix_tmp->width;
1193         cam->cam_height         = pix_tmp->height;
1194         f->fmt.pix.width        = pix_tmp->width;
1195         f->fmt.pix.height       = pix_tmp->height;
1196
1197         /*
1198          * 8. Calculate new CEU crop - apply camera scales to previously
1199          *    calculated "effective" crop.
1200          */
1201         ceu_rect->left = scale_down(sub_rect->left, scale_h);
1202         ceu_rect->width = scale_down(sub_rect->width, scale_h);
1203         ceu_rect->top = scale_down(sub_rect->top, scale_v);
1204         ceu_rect->height = scale_down(sub_rect->height, scale_v);
1205
1206         dev_geo(dev, "8: new CEU rect %ux%u@%u:%u\n",
1207                 ceu_rect->width, ceu_rect->height,
1208                 ceu_rect->left, ceu_rect->top);
1209
1210         return 0;
1211 }
1212
1213 /* Get combined scales */
1214 static int get_scales(struct soc_camera_device *icd,
1215                       unsigned int *scale_h, unsigned int *scale_v)
1216 {
1217         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1218         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1219         struct v4l2_crop cam_crop;
1220         unsigned int width_in, height_in;
1221         int ret;
1222
1223         cam_crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1224
1225         ret = client_g_rect(sd, &cam_crop.c);
1226         if (ret < 0)
1227                 return ret;
1228
1229         ret = get_camera_scales(sd, &cam_crop.c, scale_h, scale_v);
1230         if (ret < 0)
1231                 return ret;
1232
1233         width_in = scale_up(cam->ceu_rect.width, *scale_h);
1234         height_in = scale_up(cam->ceu_rect.height, *scale_v);
1235
1236         *scale_h = calc_generic_scale(width_in, icd->user_width);
1237         *scale_v = calc_generic_scale(height_in, icd->user_height);
1238
1239         return 0;
1240 }
1241
1242 /*
1243  * CEU can scale and crop, but we don't want to waste bandwidth and kill the
1244  * framerate by always requesting the maximum image from the client. See
1245  * Documentation/video4linux/sh_mobile_camera_ceu.txt for a description of
1246  * scaling and cropping algorithms and for the meaning of referenced here steps.
1247  */
1248 static int sh_mobile_ceu_set_crop(struct soc_camera_device *icd,
1249                                   struct v4l2_crop *a)
1250 {
1251         struct v4l2_rect *rect = &a->c;
1252         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1253         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1254         struct v4l2_crop cam_crop;
1255         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1256         struct v4l2_rect *cam_rect = &cam_crop.c, *ceu_rect = &cam->ceu_rect;
1257         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1258         struct device *dev = icd->dev.parent;
1259         struct v4l2_format f;
1260         struct v4l2_pix_format *pix = &f.fmt.pix;
1261         unsigned int scale_comb_h, scale_comb_v, scale_ceu_h, scale_ceu_v,
1262                 out_width, out_height;
1263         u32 capsr, cflcr;
1264         int ret;
1265
1266         /* 1. Calculate current combined scales. */
1267         ret = get_scales(icd, &scale_comb_h, &scale_comb_v);
1268         if (ret < 0)
1269                 return ret;
1270
1271         dev_geo(dev, "1: combined scales %u:%u\n", scale_comb_h, scale_comb_v);
1272
1273         /* 2. Apply iterative camera S_CROP for new input window. */
1274         ret = client_s_crop(sd, a, &cam_crop);
1275         if (ret < 0)
1276                 return ret;
1277
1278         dev_geo(dev, "2: camera cropped to %ux%u@%u:%u\n",
1279                 cam_rect->width, cam_rect->height,
1280                 cam_rect->left, cam_rect->top);
1281
1282         /* On success cam_crop contains current camera crop */
1283
1284         /*
1285          * 3. If old combined scales applied to new crop produce an impossible
1286          *    user window, adjust scales to produce nearest possible window.
1287          */
1288         out_width       = scale_down(rect->width, scale_comb_h);
1289         out_height      = scale_down(rect->height, scale_comb_v);
1290
1291         if (out_width > 2560)
1292                 out_width = 2560;
1293         else if (out_width < 2)
1294                 out_width = 2;
1295
1296         if (out_height > 1920)
1297                 out_height = 1920;
1298         else if (out_height < 4)
1299                 out_height = 4;
1300
1301         dev_geo(dev, "3: Adjusted output %ux%u\n", out_width, out_height);
1302
1303         /* 4. Use G_CROP to retrieve actual input window: already in cam_crop */
1304
1305         /*
1306          * 5. Using actual input window and calculated combined scales calculate
1307          *    camera target output window.
1308          */
1309         pix->width              = scale_down(cam_rect->width, scale_comb_h);
1310         pix->height             = scale_down(cam_rect->height, scale_comb_v);
1311
1312         dev_geo(dev, "5: camera target %ux%u\n", pix->width, pix->height);
1313
1314         /* 6. - 9. */
1315         pix->pixelformat        = cam->camera_fmt->fourcc;
1316         pix->colorspace         = cam->camera_fmt->colorspace;
1317
1318         capsr = capture_save_reset(pcdev);
1319         dev_dbg(dev, "CAPSR 0x%x, CFLCR 0x%x\n", capsr, pcdev->cflcr);
1320
1321         /* Make relative to camera rectangle */
1322         rect->left              -= cam_rect->left;
1323         rect->top               -= cam_rect->top;
1324
1325         f.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1326
1327         ret = client_scale(icd, cam_rect, rect, ceu_rect, &f,
1328                            pcdev->image_mode && !pcdev->is_interlaced);
1329
1330         dev_geo(dev, "6-9: %d\n", ret);
1331
1332         /* 10. Use CEU cropping to crop to the new window. */
1333         sh_mobile_ceu_set_rect(icd, out_width, out_height);
1334
1335         dev_geo(dev, "10: CEU cropped to %ux%u@%u:%u\n",
1336                 ceu_rect->width, ceu_rect->height,
1337                 ceu_rect->left, ceu_rect->top);
1338
1339         /*
1340          * 11. Calculate CEU scales from camera scales from results of (10) and
1341          *     user window from (3)
1342          */
1343         scale_ceu_h = calc_scale(ceu_rect->width, &out_width);
1344         scale_ceu_v = calc_scale(ceu_rect->height, &out_height);
1345
1346         dev_geo(dev, "11: CEU scales %u:%u\n", scale_ceu_h, scale_ceu_v);
1347
1348         /* 12. Apply CEU scales. */
1349         cflcr = scale_ceu_h | (scale_ceu_v << 16);
1350         if (cflcr != pcdev->cflcr) {
1351                 pcdev->cflcr = cflcr;
1352                 ceu_write(pcdev, CFLCR, cflcr);
1353         }
1354
1355         /* Restore capture */
1356         if (pcdev->active)
1357                 capsr |= 1;
1358         capture_restore(pcdev, capsr);
1359
1360         icd->user_width = out_width;
1361         icd->user_height = out_height;
1362
1363         /* Even if only camera cropping succeeded */
1364         return ret;
1365 }
1366
1367 /* Similar to set_crop multistage iterative algorithm */
1368 static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
1369                                  struct v4l2_format *f)
1370 {
1371         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1372         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1373         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1374         struct v4l2_pix_format *pix = &f->fmt.pix;
1375         struct v4l2_format cam_f = *f;
1376         struct v4l2_pix_format *cam_pix = &cam_f.fmt.pix;
1377         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1378         struct device *dev = icd->dev.parent;
1379         __u32 pixfmt = pix->pixelformat;
1380         const struct soc_camera_format_xlate *xlate;
1381         struct v4l2_crop cam_crop;
1382         struct v4l2_rect *cam_rect = &cam_crop.c, cam_subrect, ceu_rect;
1383         unsigned int scale_cam_h, scale_cam_v;
1384         u16 scale_v, scale_h;
1385         int ret;
1386         bool is_interlaced, image_mode;
1387
1388         switch (pix->field) {
1389         case V4L2_FIELD_INTERLACED:
1390                 is_interlaced = true;
1391                 break;
1392         case V4L2_FIELD_ANY:
1393         default:
1394                 pix->field = V4L2_FIELD_NONE;
1395                 /* fall-through */
1396         case V4L2_FIELD_NONE:
1397                 is_interlaced = false;
1398                 break;
1399         }
1400
1401         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1402         if (!xlate) {
1403                 dev_warn(dev, "Format %x not found\n", pixfmt);
1404                 return -EINVAL;
1405         }
1406
1407         /* 1. Calculate current camera scales. */
1408         cam_crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1409
1410         ret = client_g_rect(sd, cam_rect);
1411         if (ret < 0)
1412                 return ret;
1413
1414         ret = get_camera_scales(sd, cam_rect, &scale_cam_h, &scale_cam_v);
1415         if (ret < 0)
1416                 return ret;
1417
1418         dev_geo(dev, "1: camera scales %u:%u\n", scale_cam_h, scale_cam_v);
1419
1420         /*
1421          * 2. Calculate "effective" input crop (sensor subwindow) - CEU crop
1422          *    scaled back at current camera scales onto input window.
1423          */
1424         ret = get_camera_subwin(icd, &cam_subrect, scale_cam_h, scale_cam_v);
1425         if (ret < 0)
1426                 return ret;
1427
1428         dev_geo(dev, "2: subwin %ux%u@%u:%u\n",
1429                 cam_subrect.width, cam_subrect.height,
1430                 cam_subrect.left, cam_subrect.top);
1431
1432         /*
1433          * 3. Calculate new combined scales from "effective" input window to
1434          *    requested user window.
1435          */
1436         scale_h = calc_generic_scale(cam_subrect.width, pix->width);
1437         scale_v = calc_generic_scale(cam_subrect.height, pix->height);
1438
1439         dev_geo(dev, "3: scales %u:%u\n", scale_h, scale_v);
1440
1441         /*
1442          * 4. Calculate camera output window by applying combined scales to real
1443          *    input window.
1444          */
1445         cam_pix->width = scale_down(cam_rect->width, scale_h);
1446         cam_pix->height = scale_down(cam_rect->height, scale_v);
1447         cam_pix->pixelformat = xlate->cam_fmt->fourcc;
1448
1449         switch (pixfmt) {
1450         case V4L2_PIX_FMT_NV12:
1451         case V4L2_PIX_FMT_NV21:
1452         case V4L2_PIX_FMT_NV16:
1453         case V4L2_PIX_FMT_NV61:
1454                 image_mode = true;
1455                 break;
1456         default:
1457                 image_mode = false;
1458         }
1459
1460         dev_geo(dev, "4: camera output %ux%u\n",
1461                 cam_pix->width, cam_pix->height);
1462
1463         /* 5. - 9. */
1464         ret = client_scale(icd, cam_rect, &cam_subrect, &ceu_rect, &cam_f,
1465                            image_mode && !is_interlaced);
1466
1467         dev_geo(dev, "5-9: client scale %d\n", ret);
1468
1469         /* Done with the camera. Now see if we can improve the result */
1470
1471         dev_dbg(dev, "Camera %d fmt %ux%u, requested %ux%u\n",
1472                 ret, cam_pix->width, cam_pix->height, pix->width, pix->height);
1473         if (ret < 0)
1474                 return ret;
1475
1476         /* 10. Use CEU scaling to scale to the requested user window. */
1477
1478         /* We cannot scale up */
1479         if (pix->width > cam_pix->width)
1480                 pix->width = cam_pix->width;
1481         if (pix->width > ceu_rect.width)
1482                 pix->width = ceu_rect.width;
1483
1484         if (pix->height > cam_pix->height)
1485                 pix->height = cam_pix->height;
1486         if (pix->height > ceu_rect.height)
1487                 pix->height = ceu_rect.height;
1488
1489         /* Let's rock: scale pix->{width x height} down to width x height */
1490         scale_h = calc_scale(ceu_rect.width, &pix->width);
1491         scale_v = calc_scale(ceu_rect.height, &pix->height);
1492
1493         dev_geo(dev, "10: W: %u : 0x%x = %u, H: %u : 0x%x = %u\n",
1494                 ceu_rect.width, scale_h, pix->width,
1495                 ceu_rect.height, scale_v, pix->height);
1496
1497         pcdev->cflcr = scale_h | (scale_v << 16);
1498
1499         icd->buswidth = xlate->buswidth;
1500         icd->current_fmt = xlate->host_fmt;
1501         cam->camera_fmt = xlate->cam_fmt;
1502         cam->ceu_rect = ceu_rect;
1503
1504         pcdev->is_interlaced = is_interlaced;
1505         pcdev->image_mode = image_mode;
1506
1507         return 0;
1508 }
1509
1510 static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
1511                                  struct v4l2_format *f)
1512 {
1513         const struct soc_camera_format_xlate *xlate;
1514         struct v4l2_pix_format *pix = &f->fmt.pix;
1515         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1516         __u32 pixfmt = pix->pixelformat;
1517         int width, height;
1518         int ret;
1519
1520         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1521         if (!xlate) {
1522                 dev_warn(icd->dev.parent, "Format %x not found\n", pixfmt);
1523                 return -EINVAL;
1524         }
1525
1526         /* FIXME: calculate using depth and bus width */
1527
1528         v4l_bound_align_image(&pix->width, 2, 2560, 1,
1529                               &pix->height, 4, 1920, 2, 0);
1530
1531         width = pix->width;
1532         height = pix->height;
1533
1534         pix->bytesperline = pix->width *
1535                 DIV_ROUND_UP(xlate->host_fmt->depth, 8);
1536         pix->sizeimage = pix->height * pix->bytesperline;
1537
1538         pix->pixelformat = xlate->cam_fmt->fourcc;
1539
1540         /* limit to sensor capabilities */
1541         ret = v4l2_subdev_call(sd, video, try_fmt, f);
1542         pix->pixelformat = pixfmt;
1543         if (ret < 0)
1544                 return ret;
1545
1546         switch (pixfmt) {
1547         case V4L2_PIX_FMT_NV12:
1548         case V4L2_PIX_FMT_NV21:
1549         case V4L2_PIX_FMT_NV16:
1550         case V4L2_PIX_FMT_NV61:
1551                 /* FIXME: check against rect_max after converting soc-camera */
1552                 /* We can scale precisely, need a bigger image from camera */
1553                 if (pix->width < width || pix->height < height) {
1554                         int tmp_w = pix->width, tmp_h = pix->height;
1555                         pix->width = 2560;
1556                         pix->height = 1920;
1557                         ret = v4l2_subdev_call(sd, video, try_fmt, f);
1558                         if (ret < 0) {
1559                                 /* Shouldn't actually happen... */
1560                                 dev_err(icd->dev.parent,
1561                                         "FIXME: try_fmt() returned %d\n", ret);
1562                                 pix->width = tmp_w;
1563                                 pix->height = tmp_h;
1564                         }
1565                 }
1566                 if (pix->width > width)
1567                         pix->width = width;
1568                 if (pix->height > height)
1569                         pix->height = height;
1570         }
1571
1572         return ret;
1573 }
1574
1575 static int sh_mobile_ceu_reqbufs(struct soc_camera_file *icf,
1576                                  struct v4l2_requestbuffers *p)
1577 {
1578         int i;
1579
1580         /*
1581          * This is for locking debugging only. I removed spinlocks and now I
1582          * check whether .prepare is ever called on a linked buffer, or whether
1583          * a dma IRQ can occur for an in-work or unlinked buffer. Until now
1584          * it hadn't triggered
1585          */
1586         for (i = 0; i < p->count; i++) {
1587                 struct sh_mobile_ceu_buffer *buf;
1588
1589                 buf = container_of(icf->vb_vidq.bufs[i],
1590                                    struct sh_mobile_ceu_buffer, vb);
1591                 INIT_LIST_HEAD(&buf->vb.queue);
1592         }
1593
1594         return 0;
1595 }
1596
1597 static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
1598 {
1599         struct soc_camera_file *icf = file->private_data;
1600         struct sh_mobile_ceu_buffer *buf;
1601
1602         buf = list_entry(icf->vb_vidq.stream.next,
1603                          struct sh_mobile_ceu_buffer, vb.stream);
1604
1605         poll_wait(file, &buf->vb.done, pt);
1606
1607         if (buf->vb.state == VIDEOBUF_DONE ||
1608             buf->vb.state == VIDEOBUF_ERROR)
1609                 return POLLIN|POLLRDNORM;
1610
1611         return 0;
1612 }
1613
1614 static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
1615                                   struct v4l2_capability *cap)
1616 {
1617         strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
1618         cap->version = KERNEL_VERSION(0, 0, 5);
1619         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1620         return 0;
1621 }
1622
1623 static void sh_mobile_ceu_init_videobuf(struct videobuf_queue *q,
1624                                         struct soc_camera_device *icd)
1625 {
1626         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1627         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1628
1629         videobuf_queue_dma_contig_init(q,
1630                                        &sh_mobile_ceu_videobuf_ops,
1631                                        icd->dev.parent, &pcdev->lock,
1632                                        V4L2_BUF_TYPE_VIDEO_CAPTURE,
1633                                        pcdev->is_interlaced ?
1634                                        V4L2_FIELD_INTERLACED : V4L2_FIELD_NONE,
1635                                        sizeof(struct sh_mobile_ceu_buffer),
1636                                        icd);
1637 }
1638
1639 static int sh_mobile_ceu_get_ctrl(struct soc_camera_device *icd,
1640                                   struct v4l2_control *ctrl)
1641 {
1642         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1643         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1644         u32 val;
1645
1646         switch (ctrl->id) {
1647         case V4L2_CID_SHARPNESS:
1648                 val = ceu_read(pcdev, CLFCR);
1649                 ctrl->value = val ^ 1;
1650                 return 0;
1651         }
1652         return -ENOIOCTLCMD;
1653 }
1654
1655 static int sh_mobile_ceu_set_ctrl(struct soc_camera_device *icd,
1656                                   struct v4l2_control *ctrl)
1657 {
1658         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1659         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1660
1661         switch (ctrl->id) {
1662         case V4L2_CID_SHARPNESS:
1663                 switch (icd->current_fmt->fourcc) {
1664                 case V4L2_PIX_FMT_NV12:
1665                 case V4L2_PIX_FMT_NV21:
1666                 case V4L2_PIX_FMT_NV16:
1667                 case V4L2_PIX_FMT_NV61:
1668                         ceu_write(pcdev, CLFCR, !ctrl->value);
1669                         return 0;
1670                 }
1671                 return -EINVAL;
1672         }
1673         return -ENOIOCTLCMD;
1674 }
1675
1676 static const struct v4l2_queryctrl sh_mobile_ceu_controls[] = {
1677         {
1678                 .id             = V4L2_CID_SHARPNESS,
1679                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
1680                 .name           = "Low-pass filter",
1681                 .minimum        = 0,
1682                 .maximum        = 1,
1683                 .step           = 1,
1684                 .default_value  = 0,
1685         },
1686 };
1687
1688 static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
1689         .owner          = THIS_MODULE,
1690         .add            = sh_mobile_ceu_add_device,
1691         .remove         = sh_mobile_ceu_remove_device,
1692         .get_formats    = sh_mobile_ceu_get_formats,
1693         .put_formats    = sh_mobile_ceu_put_formats,
1694         .set_crop       = sh_mobile_ceu_set_crop,
1695         .set_fmt        = sh_mobile_ceu_set_fmt,
1696         .try_fmt        = sh_mobile_ceu_try_fmt,
1697         .set_ctrl       = sh_mobile_ceu_set_ctrl,
1698         .get_ctrl       = sh_mobile_ceu_get_ctrl,
1699         .reqbufs        = sh_mobile_ceu_reqbufs,
1700         .poll           = sh_mobile_ceu_poll,
1701         .querycap       = sh_mobile_ceu_querycap,
1702         .set_bus_param  = sh_mobile_ceu_set_bus_param,
1703         .init_videobuf  = sh_mobile_ceu_init_videobuf,
1704         .controls       = sh_mobile_ceu_controls,
1705         .num_controls   = ARRAY_SIZE(sh_mobile_ceu_controls),
1706 };
1707
1708 static int __devinit sh_mobile_ceu_probe(struct platform_device *pdev)
1709 {
1710         struct sh_mobile_ceu_dev *pcdev;
1711         struct resource *res;
1712         void __iomem *base;
1713         unsigned int irq;
1714         int err = 0;
1715
1716         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1717         irq = platform_get_irq(pdev, 0);
1718         if (!res || !irq) {
1719                 dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
1720                 err = -ENODEV;
1721                 goto exit;
1722         }
1723
1724         pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
1725         if (!pcdev) {
1726                 dev_err(&pdev->dev, "Could not allocate pcdev\n");
1727                 err = -ENOMEM;
1728                 goto exit;
1729         }
1730
1731         INIT_LIST_HEAD(&pcdev->capture);
1732         spin_lock_init(&pcdev->lock);
1733
1734         pcdev->pdata = pdev->dev.platform_data;
1735         if (!pcdev->pdata) {
1736                 err = -EINVAL;
1737                 dev_err(&pdev->dev, "CEU platform data not set.\n");
1738                 goto exit_kfree;
1739         }
1740
1741         base = ioremap_nocache(res->start, resource_size(res));
1742         if (!base) {
1743                 err = -ENXIO;
1744                 dev_err(&pdev->dev, "Unable to ioremap CEU registers.\n");
1745                 goto exit_kfree;
1746         }
1747
1748         pcdev->irq = irq;
1749         pcdev->base = base;
1750         pcdev->video_limit = 0; /* only enabled if second resource exists */
1751
1752         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1753         if (res) {
1754                 err = dma_declare_coherent_memory(&pdev->dev, res->start,
1755                                                   res->start,
1756                                                   resource_size(res),
1757                                                   DMA_MEMORY_MAP |
1758                                                   DMA_MEMORY_EXCLUSIVE);
1759                 if (!err) {
1760                         dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
1761                         err = -ENXIO;
1762                         goto exit_iounmap;
1763                 }
1764
1765                 pcdev->video_limit = resource_size(res);
1766         }
1767
1768         /* request irq */
1769         err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED,
1770                           dev_name(&pdev->dev), pcdev);
1771         if (err) {
1772                 dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
1773                 goto exit_release_mem;
1774         }
1775
1776         pm_suspend_ignore_children(&pdev->dev, true);
1777         pm_runtime_enable(&pdev->dev);
1778         pm_runtime_resume(&pdev->dev);
1779
1780         pcdev->ici.priv = pcdev;
1781         pcdev->ici.v4l2_dev.dev = &pdev->dev;
1782         pcdev->ici.nr = pdev->id;
1783         pcdev->ici.drv_name = dev_name(&pdev->dev);
1784         pcdev->ici.ops = &sh_mobile_ceu_host_ops;
1785
1786         err = soc_camera_host_register(&pcdev->ici);
1787         if (err)
1788                 goto exit_free_clk;
1789
1790         return 0;
1791
1792 exit_free_clk:
1793         pm_runtime_disable(&pdev->dev);
1794         free_irq(pcdev->irq, pcdev);
1795 exit_release_mem:
1796         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
1797                 dma_release_declared_memory(&pdev->dev);
1798 exit_iounmap:
1799         iounmap(base);
1800 exit_kfree:
1801         kfree(pcdev);
1802 exit:
1803         return err;
1804 }
1805
1806 static int __devexit sh_mobile_ceu_remove(struct platform_device *pdev)
1807 {
1808         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
1809         struct sh_mobile_ceu_dev *pcdev = container_of(soc_host,
1810                                         struct sh_mobile_ceu_dev, ici);
1811
1812         soc_camera_host_unregister(soc_host);
1813         pm_runtime_disable(&pdev->dev);
1814         free_irq(pcdev->irq, pcdev);
1815         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
1816                 dma_release_declared_memory(&pdev->dev);
1817         iounmap(pcdev->base);
1818         kfree(pcdev);
1819         return 0;
1820 }
1821
1822 static int sh_mobile_ceu_runtime_nop(struct device *dev)
1823 {
1824         /* Runtime PM callback shared between ->runtime_suspend()
1825          * and ->runtime_resume(). Simply returns success.
1826          *
1827          * This driver re-initializes all registers after
1828          * pm_runtime_get_sync() anyway so there is no need
1829          * to save and restore registers here.
1830          */
1831         return 0;
1832 }
1833
1834 static const struct dev_pm_ops sh_mobile_ceu_dev_pm_ops = {
1835         .runtime_suspend = sh_mobile_ceu_runtime_nop,
1836         .runtime_resume = sh_mobile_ceu_runtime_nop,
1837 };
1838
1839 static struct platform_driver sh_mobile_ceu_driver = {
1840         .driver         = {
1841                 .name   = "sh_mobile_ceu",
1842                 .pm     = &sh_mobile_ceu_dev_pm_ops,
1843         },
1844         .probe          = sh_mobile_ceu_probe,
1845         .remove         = __devexit_p(sh_mobile_ceu_remove),
1846 };
1847
1848 static int __init sh_mobile_ceu_init(void)
1849 {
1850         return platform_driver_register(&sh_mobile_ceu_driver);
1851 }
1852
1853 static void __exit sh_mobile_ceu_exit(void)
1854 {
1855         platform_driver_unregister(&sh_mobile_ceu_driver);
1856 }
1857
1858 module_init(sh_mobile_ceu_init);
1859 module_exit(sh_mobile_ceu_exit);
1860
1861 MODULE_DESCRIPTION("SuperH Mobile CEU driver");
1862 MODULE_AUTHOR("Magnus Damm");
1863 MODULE_LICENSE("GPL");
1864 MODULE_ALIAS("platform:sh_mobile_ceu");