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/slab.h>
  31 #include <linux/device.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/videodev2.h>
  34 #include <linux/pm_runtime.h>
  35 #include <linux/sched.h>
  36
  37 #include <media/v4l2-common.h>
  38 #include <media/v4l2-dev.h>
  39 #include <media/soc_camera.h>
  40 #include <media/sh_mobile_ceu.h>
  41 #include <media/videobuf-dma-contig.h>
  42 #include <media/v4l2-mediabus.h>
  43 #include <media/soc_mediabus.h>
  44
  45 /* register offsets for sh7722 / sh7723 */
  46
  47 #define CAPSR  0x00 /* Capture start register */
  48 #define CAPCR  0x04 /* Capture control register */
  49 #define CAMCR  0x08 /* Capture interface control register */
  50 #define CMCYR  0x0c /* Capture interface cycle  register */
  51 #define CAMOR  0x10 /* Capture interface offset register */
  52 #define CAPWR  0x14 /* Capture interface width register */
  53 #define CAIFR  0x18 /* Capture interface input format register */
  54 #define CSTCR  0x20 /* Camera strobe control register (<= sh7722) */
  55 #define CSECR  0x24 /* Camera strobe emission count register (<= sh7722) */
  56 #define CRCNTR 0x28 /* CEU register control register */
  57 #define CRCMPR 0x2c /* CEU register forcible control register */
  58 #define CFLCR  0x30 /* Capture filter control register */
  59 #define CFSZR  0x34 /* Capture filter size clip register */
  60 #define CDWDR  0x38 /* Capture destination width register */
  61 #define CDAYR  0x3c /* Capture data address Y register */
  62 #define CDACR  0x40 /* Capture data address C register */
  63 #define CDBYR  0x44 /* Capture data bottom-field address Y register */
  64 #define CDBCR  0x48 /* Capture data bottom-field address C register */
  65 #define CBDSR  0x4c /* Capture bundle destination size register */
  66 #define CFWCR  0x5c /* Firewall operation control register */
  67 #define CLFCR  0x60 /* Capture low-pass filter control register */
  68 #define CDOCR  0x64 /* Capture data output control register */
  69 #define CDDCR  0x68 /* Capture data complexity level register */
  70 #define CDDAR  0x6c /* Capture data complexity level address register */
  71 #define CEIER  0x70 /* Capture event interrupt enable register */
  72 #define CETCR  0x74 /* Capture event flag clear register */
  73 #define CSTSR  0x7c /* Capture status register */
  74 #define CSRTR  0x80 /* Capture software reset register */
  75 #define CDSSR  0x84 /* Capture data size register */
  76 #define CDAYR2 0x90 /* Capture data address Y register 2 */
  77 #define CDACR2 0x94 /* Capture data address C register 2 */
  78 #define CDBYR2 0x98 /* Capture data bottom-field address Y register 2 */
  79 #define CDBCR2 0x9c /* Capture data bottom-field address C register 2 */
  80
  81 #undef DEBUG_GEOMETRY
  82 #ifdef DEBUG_GEOMETRY
  83 #define dev_geo dev_info
  84 #else
  85 #define dev_geo dev_dbg
  86 #endif
  87
  88 /* per video frame buffer */
  89 struct sh_mobile_ceu_buffer {
  90         struct videobuf_buffer vb; /* v4l buffer must be first */
  91         enum v4l2_mbus_pixelcode code;
  92 };
  93
  94 struct sh_mobile_ceu_dev {
  95         struct soc_camera_host ici;
  96         struct soc_camera_device *icd;
  97
  98         unsigned int irq;
  99         void __iomem *base;
 100         unsigned long video_limit;
 101
 102         /* lock used to protect videobuf */
 103         spinlock_t lock;
 104         struct list_head capture;
 105         struct videobuf_buffer *active;
 106
 107         struct sh_mobile_ceu_info *pdata;
 108
 109         u32 cflcr;
 110
 111         enum v4l2_field field;
 112
 113         unsigned int image_mode:1;
 114         unsigned int is_16bit:1;
 115 };
 116
 117 struct sh_mobile_ceu_cam {
 118         /* CEU offsets within scaled by the CEU camera output */
 119         unsigned int ceu_left;
 120         unsigned int ceu_top;
 121         /* Client output, as seen by the CEU */
 122         unsigned int width;
 123         unsigned int height;
 124         /*
 125          * User window from S_CROP / G_CROP, produced by client cropping and
 126          * scaling, CEU scaling and CEU cropping, mapped back onto the client
 127          * input window
 128          */
 129         struct v4l2_rect subrect;
 130         /* Camera cropping rectangle */
 131         struct v4l2_rect rect;
 132         const struct soc_mbus_pixelfmt *extra_fmt;
 133         enum v4l2_mbus_pixelcode code;
 134 };
 135
 136 static unsigned long make_bus_param(struct sh_mobile_ceu_dev *pcdev)
 137 {
 138         unsigned long flags;
 139
 140         flags = SOCAM_MASTER |
 141                 SOCAM_PCLK_SAMPLE_RISING |
 142                 SOCAM_HSYNC_ACTIVE_HIGH |
 143                 SOCAM_HSYNC_ACTIVE_LOW |
 144                 SOCAM_VSYNC_ACTIVE_HIGH |
 145                 SOCAM_VSYNC_ACTIVE_LOW |
 146                 SOCAM_DATA_ACTIVE_HIGH;
 147
 148         if (pcdev->pdata->flags & SH_CEU_FLAG_USE_8BIT_BUS)
 149                 flags |= SOCAM_DATAWIDTH_8;
 150
 151         if (pcdev->pdata->flags & SH_CEU_FLAG_USE_16BIT_BUS)
 152                 flags |= SOCAM_DATAWIDTH_16;
 153
 154         if (flags & SOCAM_DATAWIDTH_MASK)
 155                 return flags;
 156
 157         return 0;
 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         struct soc_camera_device *icd = pcdev->icd;
 175
 176         ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
 177
 178         /* wait CSTSR.CPTON bit */
 179         for (i = 0; i < 1000; i++) {
 180                 if (!(ceu_read(pcdev, CSTSR) & 1)) {
 181                         success++;
 182                         break;
 183                 }
 184                 udelay(1);
 185         }
 186
 187         /* wait CAPSR.CPKIL bit */
 188         for (i = 0; i < 1000; i++) {
 189                 if (!(ceu_read(pcdev, CAPSR) & (1 << 16))) {
 190                         success++;
 191                         break;
 192                 }
 193                 udelay(1);
 194         }
 195
 196
 197         if (2 != success) {
 198                 dev_warn(&icd->dev, "soft reset time out\n");
 199                 return -EIO;
 200         }
 201
 202         return 0;
 203 }
 204
 205 /*
 206  *  Videobuf operations
 207  */
 208 static int sh_mobile_ceu_videobuf_setup(struct videobuf_queue *vq,
 209                                         unsigned int *count,
 210                                         unsigned int *size)
 211 {
 212         struct soc_camera_device *icd = vq->priv_data;
 213         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 214         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 215         int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 216                                                 icd->current_fmt->host_fmt);
 217
 218         if (bytes_per_line < 0)
 219                 return bytes_per_line;
 220
 221         *size = bytes_per_line * icd->user_height;
 222
 223         if (0 == *count)
 224                 *count = 2;
 225
 226         if (pcdev->video_limit) {
 227                 if (PAGE_ALIGN(*size) * *count > pcdev->video_limit)
 228                         *count = pcdev->video_limit / PAGE_ALIGN(*size);
 229         }
 230
 231         dev_dbg(icd->dev.parent, "count=%d, size=%d\n", *count, *size);
 232
 233         return 0;
 234 }
 235
 236 static void free_buffer(struct videobuf_queue *vq,
 237                         struct sh_mobile_ceu_buffer *buf)
 238 {
 239         struct soc_camera_device *icd = vq->priv_data;
 240         struct device *dev = icd->dev.parent;
 241
 242         dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
 243                 &buf->vb, buf->vb.baddr, buf->vb.bsize);
 244
 245         if (in_interrupt())
 246                 BUG();
 247
 248         videobuf_waiton(&buf->vb, 0, 0);
 249         videobuf_dma_contig_free(vq, &buf->vb);
 250         dev_dbg(dev, "%s freed\n", __func__);
 251         buf->vb.state = VIDEOBUF_NEEDS_INIT;
 252 }
 253
 254 #define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */
 255 #define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */
 256 #define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */
 257 #define CEU_CEIER_VBP   (1 << 20) /* vbp error */
 258 #define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */
 259 #define CEU_CEIER_MASK (CEU_CEIER_CPEIE | CEU_CEIER_VBP)
 260
 261
 262 /*
 263  * return value doesn't reflex the success/failure to queue the new buffer,
 264  * but rather the status of the previous buffer.
 265  */
 266 static int sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
 267 {
 268         struct soc_camera_device *icd = pcdev->icd;
 269         dma_addr_t phys_addr_top, phys_addr_bottom;
 270         unsigned long top1, top2;
 271         unsigned long bottom1, bottom2;
 272         u32 status;
 273         int ret = 0;
 274
 275         /*
 276          * The hardware is _very_ picky about this sequence. Especially
 277          * the CEU_CETCR_MAGIC value. It seems like we need to acknowledge
 278          * several not-so-well documented interrupt sources in CETCR.
 279          */
 280         ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_MASK);
 281         status = ceu_read(pcdev, CETCR);
 282         ceu_write(pcdev, CETCR, ~status & CEU_CETCR_MAGIC);
 283         ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_MASK);
 284         ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP);
 285         ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW);
 286
 287         /*
 288          * When a VBP interrupt occurs, a capture end interrupt does not occur
 289          * and the image of that frame is not captured correctly. So, soft reset
 290          * is needed here.
 291          */
 292         if (status & CEU_CEIER_VBP) {
 293                 sh_mobile_ceu_soft_reset(pcdev);
 294                 ret = -EIO;
 295         }
 296
 297         if (!pcdev->active)
 298                 return ret;
 299
 300         if (V4L2_FIELD_INTERLACED_BT == pcdev->field) {
 301                 top1    = CDBYR;
 302                 top2    = CDBCR;
 303                 bottom1 = CDAYR;
 304                 bottom2 = CDACR;
 305         } else {
 306                 top1    = CDAYR;
 307                 top2    = CDACR;
 308                 bottom1 = CDBYR;
 309                 bottom2 = CDBCR;
 310         }
 311
 312         phys_addr_top = videobuf_to_dma_contig(pcdev->active);
 313         ceu_write(pcdev, top1, phys_addr_top);
 314         if (V4L2_FIELD_NONE != pcdev->field) {
 315                 phys_addr_bottom = phys_addr_top + icd->user_width;
 316                 ceu_write(pcdev, bottom1, phys_addr_bottom);
 317         }
 318
 319         switch (icd->current_fmt->host_fmt->fourcc) {
 320         case V4L2_PIX_FMT_NV12:
 321         case V4L2_PIX_FMT_NV21:
 322         case V4L2_PIX_FMT_NV16:
 323         case V4L2_PIX_FMT_NV61:
 324                 phys_addr_top += icd->user_width *
 325                         icd->user_height;
 326                 ceu_write(pcdev, top2, phys_addr_top);
 327                 if (V4L2_FIELD_NONE != pcdev->field) {
 328                         phys_addr_bottom = phys_addr_top + icd->user_width;
 329                         ceu_write(pcdev, bottom2, phys_addr_bottom);
 330                 }
 331         }
 332
 333         pcdev->active->state = VIDEOBUF_ACTIVE;
 334         ceu_write(pcdev, CAPSR, 0x1); /* start capture */
 335
 336         return ret;
 337 }
 338
 339 static int sh_mobile_ceu_videobuf_prepare(struct videobuf_queue *vq,
 340                                           struct videobuf_buffer *vb,
 341                                           enum v4l2_field field)
 342 {
 343         struct soc_camera_device *icd = vq->priv_data;
 344         struct sh_mobile_ceu_buffer *buf;
 345         int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 346                                                 icd->current_fmt->host_fmt);
 347         int ret;
 348
 349         if (bytes_per_line < 0)
 350                 return bytes_per_line;
 351
 352         buf = container_of(vb, struct sh_mobile_ceu_buffer, vb);
 353
 354         dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
 355                 vb, vb->baddr, vb->bsize);
 356
 357         /* Added list head initialization on alloc */
 358         WARN_ON(!list_empty(&vb->queue));
 359
 360 #ifdef DEBUG
 361         /*
 362          * This can be useful if you want to see if we actually fill
 363          * the buffer with something
 364          */
 365         memset((void *)vb->baddr, 0xaa, vb->bsize);
 366 #endif
 367
 368         BUG_ON(NULL == icd->current_fmt);
 369
 370         if (buf->code   != icd->current_fmt->code ||
 371             vb->width   != icd->user_width ||
 372             vb->height  != icd->user_height ||
 373             vb->field   != field) {
 374                 buf->code       = icd->current_fmt->code;
 375                 vb->width       = icd->user_width;
 376                 vb->height      = icd->user_height;
 377                 vb->field       = field;
 378                 vb->state       = VIDEOBUF_NEEDS_INIT;
 379         }
 380
 381         vb->size = vb->height * bytes_per_line;
 382         if (0 != vb->baddr && vb->bsize < vb->size) {
 383                 ret = -EINVAL;
 384                 goto out;
 385         }
 386
 387         if (vb->state == VIDEOBUF_NEEDS_INIT) {
 388                 ret = videobuf_iolock(vq, vb, NULL);
 389                 if (ret)
 390                         goto fail;
 391                 vb->state = VIDEOBUF_PREPARED;
 392         }
 393
 394         return 0;
 395 fail:
 396         free_buffer(vq, buf);
 397 out:
 398         return ret;
 399 }
 400
 401 /* Called under spinlock_irqsave(&pcdev->lock, ...) */
 402 static void sh_mobile_ceu_videobuf_queue(struct videobuf_queue *vq,
 403                                          struct videobuf_buffer *vb)
 404 {
 405         struct soc_camera_device *icd = vq->priv_data;
 406         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 407         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 408
 409         dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
 410                 vb, vb->baddr, vb->bsize);
 411
 412         vb->state = VIDEOBUF_QUEUED;
 413         list_add_tail(&vb->queue, &pcdev->capture);
 414
 415         if (!pcdev->active) {
 416                 /*
 417                  * Because there were no active buffer at this moment,
 418                  * we are not interested in the return value of
 419                  * sh_mobile_ceu_capture here.
 420                  */
 421                 pcdev->active = vb;
 422                 sh_mobile_ceu_capture(pcdev);
 423         }
 424 }
 425
 426 static void sh_mobile_ceu_videobuf_release(struct videobuf_queue *vq,
 427                                            struct videobuf_buffer *vb)
 428 {
 429         struct soc_camera_device *icd = vq->priv_data;
 430         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 431         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 432         unsigned long flags;
 433
 434         spin_lock_irqsave(&pcdev->lock, flags);
 435
 436         if (pcdev->active == vb) {
 437                 /* disable capture (release DMA buffer), reset */
 438                 ceu_write(pcdev, CAPSR, 1 << 16);
 439                 pcdev->active = NULL;
 440         }
 441
 442         if ((vb->state == VIDEOBUF_ACTIVE || vb->state == VIDEOBUF_QUEUED) &&
 443             !list_empty(&vb->queue)) {
 444                 vb->state = VIDEOBUF_ERROR;
 445                 list_del_init(&vb->queue);
 446         }
 447
 448         spin_unlock_irqrestore(&pcdev->lock, flags);
 449
 450         free_buffer(vq, container_of(vb, struct sh_mobile_ceu_buffer, vb));
 451 }
 452
 453 static struct videobuf_queue_ops sh_mobile_ceu_videobuf_ops = {
 454         .buf_setup      = sh_mobile_ceu_videobuf_setup,
 455         .buf_prepare    = sh_mobile_ceu_videobuf_prepare,
 456         .buf_queue      = sh_mobile_ceu_videobuf_queue,
 457         .buf_release    = sh_mobile_ceu_videobuf_release,
 458 };
 459
 460 static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
 461 {
 462         struct sh_mobile_ceu_dev *pcdev = data;
 463         struct videobuf_buffer *vb;
 464         unsigned long flags;
 465
 466         spin_lock_irqsave(&pcdev->lock, flags);
 467
 468         vb = pcdev->active;
 469         if (!vb)
 470                 /* Stale interrupt from a released buffer */
 471                 goto out;
 472
 473         list_del_init(&vb->queue);
 474
 475         if (!list_empty(&pcdev->capture))
 476                 pcdev->active = list_entry(pcdev->capture.next,
 477                                            struct videobuf_buffer, queue);
 478         else
 479                 pcdev->active = NULL;
 480
 481         vb->state = (sh_mobile_ceu_capture(pcdev) < 0) ?
 482                 VIDEOBUF_ERROR : VIDEOBUF_DONE;
 483         do_gettimeofday(&vb->ts);
 484         vb->field_count++;
 485         wake_up(&vb->done);
 486
 487 out:
 488         spin_unlock_irqrestore(&pcdev->lock, flags);
 489
 490         return IRQ_HANDLED;
 491 }
 492
 493 /* Called with .video_lock held */
 494 static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
 495 {
 496         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 497         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 498         int ret;
 499
 500         if (pcdev->icd)
 501                 return -EBUSY;
 502
 503         dev_info(icd->dev.parent,
 504                  "SuperH Mobile CEU driver attached to camera %d\n",
 505                  icd->devnum);
 506
 507         pm_runtime_get_sync(ici->v4l2_dev.dev);
 508
 509         ret = sh_mobile_ceu_soft_reset(pcdev);
 510         if (!ret)
 511                 pcdev->icd = icd;
 512
 513         return ret;
 514 }
 515
 516 /* Called with .video_lock held */
 517 static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
 518 {
 519         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 520         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 521         unsigned long flags;
 522
 523         BUG_ON(icd != pcdev->icd);
 524
 525         /* disable capture, disable interrupts */
 526         ceu_write(pcdev, CEIER, 0);
 527         sh_mobile_ceu_soft_reset(pcdev);
 528
 529         /* make sure active buffer is canceled */
 530         spin_lock_irqsave(&pcdev->lock, flags);
 531         if (pcdev->active) {
 532                 list_del(&pcdev->active->queue);
 533                 pcdev->active->state = VIDEOBUF_ERROR;
 534                 wake_up_all(&pcdev->active->done);
 535                 pcdev->active = NULL;
 536         }
 537         spin_unlock_irqrestore(&pcdev->lock, flags);
 538
 539         pm_runtime_put_sync(ici->v4l2_dev.dev);
 540
 541         dev_info(icd->dev.parent,
 542                  "SuperH Mobile CEU driver detached from camera %d\n",
 543                  icd->devnum);
 544
 545         pcdev->icd = NULL;
 546 }
 547
 548 /*
 549  * See chapter 29.4.12 "Capture Filter Control Register (CFLCR)"
 550  * in SH7722 Hardware Manual
 551  */
 552 static unsigned int size_dst(unsigned int src, unsigned int scale)
 553 {
 554         unsigned int mant_pre = scale >> 12;
 555         if (!src || !scale)
 556                 return src;
 557         return ((mant_pre + 2 * (src - 1)) / (2 * mant_pre) - 1) *
 558                 mant_pre * 4096 / scale + 1;
 559 }
 560
 561 static u16 calc_scale(unsigned int src, unsigned int *dst)
 562 {
 563         u16 scale;
 564
 565         if (src == *dst)
 566                 return 0;
 567
 568         scale = (src * 4096 / *dst) & ~7;
 569
 570         while (scale > 4096 && size_dst(src, scale) < *dst)
 571                 scale -= 8;
 572
 573         *dst = size_dst(src, scale);
 574
 575         return scale;
 576 }
 577
 578 /* rect is guaranteed to not exceed the scaled camera rectangle */
 579 static void sh_mobile_ceu_set_rect(struct soc_camera_device *icd)
 580 {
 581         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 582         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 583         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 584         unsigned int height, width, cdwdr_width, in_width, in_height;
 585         unsigned int left_offset, top_offset;
 586         u32 camor;
 587
 588         dev_geo(icd->dev.parent, "Crop %ux%u@%u:%u\n",
 589                 icd->user_width, icd->user_height, cam->ceu_left, cam->ceu_top);
 590
 591         left_offset     = cam->ceu_left;
 592         top_offset      = cam->ceu_top;
 593
 594         /* CEU cropping (CFSZR) is applied _after_ the scaling filter (CFLCR) */
 595         if (pcdev->image_mode) {
 596                 in_width = cam->width;
 597                 if (!pcdev->is_16bit) {
 598                         in_width *= 2;
 599                         left_offset *= 2;
 600                 }
 601                 width = icd->user_width;
 602                 cdwdr_width = icd->user_width;
 603         } else {
 604                 int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 605                                                 icd->current_fmt->host_fmt);
 606                 unsigned int w_factor;
 607
 608                 width = icd->user_width;
 609
 610                 switch (icd->current_fmt->host_fmt->packing) {
 611                 case SOC_MBUS_PACKING_2X8_PADHI:
 612                         w_factor = 2;
 613                         break;
 614                 default:
 615                         w_factor = 1;
 616                 }
 617
 618                 in_width = cam->width * w_factor;
 619                 left_offset = left_offset * w_factor;
 620
 621                 if (bytes_per_line < 0)
 622                         cdwdr_width = icd->user_width;
 623                 else
 624                         cdwdr_width = bytes_per_line;
 625         }
 626
 627         height = icd->user_height;
 628         in_height = cam->height;
 629         if (V4L2_FIELD_NONE != pcdev->field) {
 630                 height /= 2;
 631                 in_height /= 2;
 632                 top_offset /= 2;
 633                 cdwdr_width *= 2;
 634         }
 635
 636         /* CSI2 special configuration */
 637         if (pcdev->pdata->csi2_dev) {
 638                 in_width = ((in_width - 2) * 2);
 639                 left_offset *= 2;
 640         }
 641
 642         /* Set CAMOR, CAPWR, CFSZR, take care of CDWDR */
 643         camor = left_offset | (top_offset << 16);
 644
 645         dev_geo(icd->dev.parent,
 646                 "CAMOR 0x%x, CAPWR 0x%x, CFSZR 0x%x, CDWDR 0x%x\n", camor,
 647                 (in_height << 16) | in_width, (height << 16) | width,
 648                 cdwdr_width);
 649
 650         ceu_write(pcdev, CAMOR, camor);
 651         ceu_write(pcdev, CAPWR, (in_height << 16) | in_width);
 652         ceu_write(pcdev, CFSZR, (height << 16) | width);
 653         ceu_write(pcdev, CDWDR, cdwdr_width);
 654 }
 655
 656 static u32 capture_save_reset(struct sh_mobile_ceu_dev *pcdev)
 657 {
 658         u32 capsr = ceu_read(pcdev, CAPSR);
 659         ceu_write(pcdev, CAPSR, 1 << 16); /* reset, stop capture */
 660         return capsr;
 661 }
 662
 663 static void capture_restore(struct sh_mobile_ceu_dev *pcdev, u32 capsr)
 664 {
 665         unsigned long timeout = jiffies + 10 * HZ;
 666
 667         /*
 668          * Wait until the end of the current frame. It can take a long time,
 669          * but if it has been aborted by a CAPSR reset, it shoule exit sooner.
 670          */
 671         while ((ceu_read(pcdev, CSTSR) & 1) && time_before(jiffies, timeout))
 672                 msleep(1);
 673
 674         if (time_after(jiffies, timeout)) {
 675                 dev_err(pcdev->ici.v4l2_dev.dev,
 676                         "Timeout waiting for frame end! Interface problem?\n");
 677                 return;
 678         }
 679
 680         /* Wait until reset clears, this shall not hang... */
 681         while (ceu_read(pcdev, CAPSR) & (1 << 16))
 682                 udelay(10);
 683
 684         /* Anything to restore? */
 685         if (capsr & ~(1 << 16))
 686                 ceu_write(pcdev, CAPSR, capsr);
 687 }
 688
 689 static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
 690                                        __u32 pixfmt)
 691 {
 692         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 693         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 694         int ret;
 695         unsigned long camera_flags, common_flags, value;
 696         int yuv_lineskip;
 697         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 698         u32 capsr = capture_save_reset(pcdev);
 699
 700         camera_flags = icd->ops->query_bus_param(icd);
 701         common_flags = soc_camera_bus_param_compatible(camera_flags,
 702                                                        make_bus_param(pcdev));
 703         if (!common_flags)
 704                 return -EINVAL;
 705
 706         /* Make choises, based on platform preferences */
 707         if ((common_flags & SOCAM_HSYNC_ACTIVE_HIGH) &&
 708             (common_flags & SOCAM_HSYNC_ACTIVE_LOW)) {
 709                 if (pcdev->pdata->flags & SH_CEU_FLAG_HSYNC_LOW)
 710                         common_flags &= ~SOCAM_HSYNC_ACTIVE_HIGH;
 711                 else
 712                         common_flags &= ~SOCAM_HSYNC_ACTIVE_LOW;
 713         }
 714
 715         if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) &&
 716             (common_flags & SOCAM_VSYNC_ACTIVE_LOW)) {
 717                 if (pcdev->pdata->flags & SH_CEU_FLAG_VSYNC_LOW)
 718                         common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH;
 719                 else
 720                         common_flags &= ~SOCAM_VSYNC_ACTIVE_LOW;
 721         }
 722
 723         ret = icd->ops->set_bus_param(icd, common_flags);
 724         if (ret < 0)
 725                 return ret;
 726
 727         switch (common_flags & SOCAM_DATAWIDTH_MASK) {
 728         case SOCAM_DATAWIDTH_8:
 729                 pcdev->is_16bit = 0;
 730                 break;
 731         case SOCAM_DATAWIDTH_16:
 732                 pcdev->is_16bit = 1;
 733                 break;
 734         default:
 735                 return -EINVAL;
 736         }
 737
 738         ceu_write(pcdev, CRCNTR, 0);
 739         ceu_write(pcdev, CRCMPR, 0);
 740
 741         value = 0x00000010; /* data fetch by default */
 742         yuv_lineskip = 0;
 743
 744         switch (icd->current_fmt->host_fmt->fourcc) {
 745         case V4L2_PIX_FMT_NV12:
 746         case V4L2_PIX_FMT_NV21:
 747                 yuv_lineskip = 1; /* skip for NV12/21, no skip for NV16/61 */
 748                 /* fall-through */
 749         case V4L2_PIX_FMT_NV16:
 750         case V4L2_PIX_FMT_NV61:
 751                 switch (cam->code) {
 752                 case V4L2_MBUS_FMT_UYVY8_2X8:
 753                         value = 0x00000000; /* Cb0, Y0, Cr0, Y1 */
 754                         break;
 755                 case V4L2_MBUS_FMT_VYUY8_2X8:
 756                         value = 0x00000100; /* Cr0, Y0, Cb0, Y1 */
 757                         break;
 758                 case V4L2_MBUS_FMT_YUYV8_2X8:
 759                         value = 0x00000200; /* Y0, Cb0, Y1, Cr0 */
 760                         break;
 761                 case V4L2_MBUS_FMT_YVYU8_2X8:
 762                         value = 0x00000300; /* Y0, Cr0, Y1, Cb0 */
 763                         break;
 764                 default:
 765                         BUG();
 766                 }
 767         }
 768
 769         if (icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV21 ||
 770             icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV61)
 771                 value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */
 772
 773         value |= common_flags & SOCAM_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
 774         value |= common_flags & SOCAM_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
 775         value |= pcdev->is_16bit ? 1 << 12 : 0;
 776
 777         /* CSI2 mode */
 778         if (pcdev->pdata->csi2_dev)
 779                 value |= 3 << 12;
 780
 781         ceu_write(pcdev, CAMCR, value);
 782
 783         ceu_write(pcdev, CAPCR, 0x00300000);
 784
 785         switch (pcdev->field) {
 786         case V4L2_FIELD_INTERLACED_TB:
 787                 value = 0x101;
 788                 break;
 789         case V4L2_FIELD_INTERLACED_BT:
 790                 value = 0x102;
 791                 break;
 792         default:
 793                 value = 0;
 794                 break;
 795         }
 796         ceu_write(pcdev, CAIFR, value);
 797
 798         sh_mobile_ceu_set_rect(icd);
 799         mdelay(1);
 800
 801         dev_geo(icd->dev.parent, "CFLCR 0x%x\n", pcdev->cflcr);
 802         ceu_write(pcdev, CFLCR, pcdev->cflcr);
 803
 804         /*
 805          * A few words about byte order (observed in Big Endian mode)
 806          *
 807          * In data fetch mode bytes are received in chunks of 8 bytes.
 808          * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
 809          *
 810          * The data is however by default written to memory in reverse order:
 811          * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
 812          *
 813          * The lowest three bits of CDOCR allows us to do swapping,
 814          * using 7 we swap the data bytes to match the incoming order:
 815          * D0, D1, D2, D3, D4, D5, D6, D7
 816          */
 817         value = 0x00000017;
 818         if (yuv_lineskip)
 819                 value &= ~0x00000010; /* convert 4:2:2 -> 4:2:0 */
 820
 821         ceu_write(pcdev, CDOCR, value);
 822         ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
 823
 824         dev_dbg(icd->dev.parent, "S_FMT successful for %c%c%c%c %ux%u\n",
 825                 pixfmt & 0xff, (pixfmt >> 8) & 0xff,
 826                 (pixfmt >> 16) & 0xff, (pixfmt >> 24) & 0xff,
 827                 icd->user_width, icd->user_height);
 828
 829         capture_restore(pcdev, capsr);
 830
 831         /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
 832         return 0;
 833 }
 834
 835 static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd,
 836                                        unsigned char buswidth)
 837 {
 838         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 839         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 840         unsigned long camera_flags, common_flags;
 841
 842         camera_flags = icd->ops->query_bus_param(icd);
 843         common_flags = soc_camera_bus_param_compatible(camera_flags,
 844                                                        make_bus_param(pcdev));
 845         if (!common_flags || buswidth > 16 ||
 846             (buswidth > 8 && !(common_flags & SOCAM_DATAWIDTH_16)))
 847                 return -EINVAL;
 848
 849         return 0;
 850 }
 851
 852 static const struct soc_mbus_pixelfmt sh_mobile_ceu_formats[] = {
 853         {
 854                 .fourcc                 = V4L2_PIX_FMT_NV12,
 855                 .name                   = "NV12",
 856                 .bits_per_sample        = 12,
 857                 .packing                = SOC_MBUS_PACKING_NONE,
 858                 .order                  = SOC_MBUS_ORDER_LE,
 859         }, {
 860                 .fourcc                 = V4L2_PIX_FMT_NV21,
 861                 .name                   = "NV21",
 862                 .bits_per_sample        = 12,
 863                 .packing                = SOC_MBUS_PACKING_NONE,
 864                 .order                  = SOC_MBUS_ORDER_LE,
 865         }, {
 866                 .fourcc                 = V4L2_PIX_FMT_NV16,
 867                 .name                   = "NV16",
 868                 .bits_per_sample        = 16,
 869                 .packing                = SOC_MBUS_PACKING_NONE,
 870                 .order                  = SOC_MBUS_ORDER_LE,
 871         }, {
 872                 .fourcc                 = V4L2_PIX_FMT_NV61,
 873                 .name                   = "NV61",
 874                 .bits_per_sample        = 16,
 875                 .packing                = SOC_MBUS_PACKING_NONE,
 876                 .order                  = SOC_MBUS_ORDER_LE,
 877         },
 878 };
 879
 880 /* This will be corrected as we get more formats */
 881 static bool sh_mobile_ceu_packing_supported(const struct soc_mbus_pixelfmt *fmt)
 882 {
 883         return  fmt->packing == SOC_MBUS_PACKING_NONE ||
 884                 (fmt->bits_per_sample == 8 &&
 885                  fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
 886                 (fmt->bits_per_sample > 8 &&
 887                  fmt->packing == SOC_MBUS_PACKING_EXTEND16);
 888 }
 889
 890 static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect);
 891
 892 static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, unsigned int idx,
 893                                      struct soc_camera_format_xlate *xlate)
 894 {
 895         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 896         struct device *dev = icd->dev.parent;
 897         struct soc_camera_host *ici = to_soc_camera_host(dev);
 898         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 899         int ret, k, n;
 900         int formats = 0;
 901         struct sh_mobile_ceu_cam *cam;
 902         enum v4l2_mbus_pixelcode code;
 903         const struct soc_mbus_pixelfmt *fmt;
 904
 905         ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
 906         if (ret < 0)
 907                 /* No more formats */
 908                 return 0;
 909
 910         fmt = soc_mbus_get_fmtdesc(code);
 911         if (!fmt) {
 912                 dev_err(dev, "Invalid format code #%u: %d\n", idx, code);
 913                 return -EINVAL;
 914         }
 915
 916         if (!pcdev->pdata->csi2_dev) {
 917                 ret = sh_mobile_ceu_try_bus_param(icd, fmt->bits_per_sample);
 918                 if (ret < 0)
 919                         return 0;
 920         }
 921
 922         if (!icd->host_priv) {
 923                 struct v4l2_mbus_framefmt mf;
 924                 struct v4l2_rect rect;
 925                 int shift = 0;
 926
 927                 /* FIXME: subwindow is lost between close / open */
 928
 929                 /* Cache current client geometry */
 930                 ret = client_g_rect(sd, &rect);
 931                 if (ret < 0)
 932                         return ret;
 933
 934                 /* First time */
 935                 ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
 936                 if (ret < 0)
 937                         return ret;
 938
 939                 while ((mf.width > 2560 || mf.height > 1920) && shift < 4) {
 940                         /* Try 2560x1920, 1280x960, 640x480, 320x240 */
 941                         mf.width        = 2560 >> shift;
 942                         mf.height       = 1920 >> shift;
 943                         ret = v4l2_device_call_until_err(sd->v4l2_dev, 0, video,
 944                                                          s_mbus_fmt, &mf);
 945                         if (ret < 0)
 946                                 return ret;
 947                         shift++;
 948                 }
 949
 950                 if (shift == 4) {
 951                         dev_err(dev, "Failed to configure the client below %ux%x\n",
 952                                 mf.width, mf.height);
 953                         return -EIO;
 954                 }
 955
 956                 dev_geo(dev, "camera fmt %ux%u\n", mf.width, mf.height);
 957
 958                 cam = kzalloc(sizeof(*cam), GFP_KERNEL);
 959                 if (!cam)
 960                         return -ENOMEM;
 961
 962                 /* We are called with current camera crop, initialise subrect with it */
 963                 cam->rect       = rect;
 964                 cam->subrect    = rect;
 965
 966                 cam->width      = mf.width;
 967                 cam->height     = mf.height;
 968
 969                 cam->width      = mf.width;
 970                 cam->height     = mf.height;
 971
 972                 icd->host_priv = cam;
 973         } else {
 974                 cam = icd->host_priv;
 975         }
 976
 977         /* Beginning of a pass */
 978         if (!idx)
 979                 cam->extra_fmt = NULL;
 980
 981         switch (code) {
 982         case V4L2_MBUS_FMT_UYVY8_2X8:
 983         case V4L2_MBUS_FMT_VYUY8_2X8:
 984         case V4L2_MBUS_FMT_YUYV8_2X8:
 985         case V4L2_MBUS_FMT_YVYU8_2X8:
 986                 if (cam->extra_fmt)
 987                         break;
 988
 989                 /*
 990                  * Our case is simple so far: for any of the above four camera
 991                  * formats we add all our four synthesized NV* formats, so,
 992                  * just marking the device with a single flag suffices. If
 993                  * the format generation rules are more complex, you would have
 994                  * to actually hang your already added / counted formats onto
 995                  * the host_priv pointer and check whether the format you're
 996                  * going to add now is already there.
 997                  */
 998                 cam->extra_fmt = sh_mobile_ceu_formats;
 999
1000                 n = ARRAY_SIZE(sh_mobile_ceu_formats);
1001                 formats += n;
1002                 for (k = 0; xlate && k < n; k++) {
1003                         xlate->host_fmt = &sh_mobile_ceu_formats[k];
1004                         xlate->code     = code;
1005                         xlate++;
1006                         dev_dbg(dev, "Providing format %s using code %d\n",
1007                                 sh_mobile_ceu_formats[k].name, code);
1008                 }
1009                 break;
1010         default:
1011                 if (!sh_mobile_ceu_packing_supported(fmt))
1012                         return 0;
1013         }
1014
1015         /* Generic pass-through */
1016         formats++;
1017         if (xlate) {
1018                 xlate->host_fmt = fmt;
1019                 xlate->code     = code;
1020                 xlate++;
1021                 dev_dbg(dev, "Providing format %s in pass-through mode\n",
1022                         fmt->name);
1023         }
1024
1025         return formats;
1026 }
1027
1028 static void sh_mobile_ceu_put_formats(struct soc_camera_device *icd)
1029 {
1030         kfree(icd->host_priv);
1031         icd->host_priv = NULL;
1032 }
1033
1034 /* Check if any dimension of r1 is smaller than respective one of r2 */
1035 static bool is_smaller(struct v4l2_rect *r1, struct v4l2_rect *r2)
1036 {
1037         return r1->width < r2->width || r1->height < r2->height;
1038 }
1039
1040 /* Check if r1 fails to cover r2 */
1041 static bool is_inside(struct v4l2_rect *r1, struct v4l2_rect *r2)
1042 {
1043         return r1->left > r2->left || r1->top > r2->top ||
1044                 r1->left + r1->width < r2->left + r2->width ||
1045                 r1->top + r1->height < r2->top + r2->height;
1046 }
1047
1048 static unsigned int scale_down(unsigned int size, unsigned int scale)
1049 {
1050         return (size * 4096 + scale / 2) / scale;
1051 }
1052
1053 static unsigned int calc_generic_scale(unsigned int input, unsigned int output)
1054 {
1055         return (input * 4096 + output / 2) / output;
1056 }
1057
1058 /* Get and store current client crop */
1059 static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect)
1060 {
1061         struct v4l2_crop crop;
1062         struct v4l2_cropcap cap;
1063         int ret;
1064
1065         crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1066
1067         ret = v4l2_subdev_call(sd, video, g_crop, &crop);
1068         if (!ret) {
1069                 *rect = crop.c;
1070                 return ret;
1071         }
1072
1073         /* Camera driver doesn't support .g_crop(), assume default rectangle */
1074         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1075
1076         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1077         if (!ret)
1078                 *rect = cap.defrect;
1079
1080         return ret;
1081 }
1082
1083 /* Client crop has changed, update our sub-rectangle to remain within the area */
1084 static void update_subrect(struct sh_mobile_ceu_cam *cam)
1085 {
1086         struct v4l2_rect *rect = &cam->rect, *subrect = &cam->subrect;
1087
1088         if (rect->width < subrect->width)
1089                 subrect->width = rect->width;
1090
1091         if (rect->height < subrect->height)
1092                 subrect->height = rect->height;
1093
1094         if (rect->left > subrect->left)
1095                 subrect->left = rect->left;
1096         else if (rect->left + rect->width >
1097                  subrect->left + subrect->width)
1098                 subrect->left = rect->left + rect->width -
1099                         subrect->width;
1100
1101         if (rect->top > subrect->top)
1102                 subrect->top = rect->top;
1103         else if (rect->top + rect->height >
1104                  subrect->top + subrect->height)
1105                 subrect->top = rect->top + rect->height -
1106                         subrect->height;
1107 }
1108
1109 /*
1110  * The common for both scaling and cropping iterative approach is:
1111  * 1. try if the client can produce exactly what requested by the user
1112  * 2. if (1) failed, try to double the client image until we get one big enough
1113  * 3. if (2) failed, try to request the maximum image
1114  */
1115 static int client_s_crop(struct soc_camera_device *icd, struct v4l2_crop *crop,
1116                          struct v4l2_crop *cam_crop)
1117 {
1118         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1119         struct v4l2_rect *rect = &crop->c, *cam_rect = &cam_crop->c;
1120         struct device *dev = sd->v4l2_dev->dev;
1121         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1122         struct v4l2_cropcap cap;
1123         int ret;
1124         unsigned int width, height;
1125
1126         v4l2_subdev_call(sd, video, s_crop, crop);
1127         ret = client_g_rect(sd, cam_rect);
1128         if (ret < 0)
1129                 return ret;
1130
1131         /*
1132          * Now cam_crop contains the current camera input rectangle, and it must
1133          * be within camera cropcap bounds
1134          */
1135         if (!memcmp(rect, cam_rect, sizeof(*rect))) {
1136                 /* Even if camera S_CROP failed, but camera rectangle matches */
1137                 dev_dbg(dev, "Camera S_CROP successful for %dx%d@%d:%d\n",
1138                         rect->width, rect->height, rect->left, rect->top);
1139                 cam->rect = *cam_rect;
1140                 return 0;
1141         }
1142
1143         /* Try to fix cropping, that camera hasn't managed to set */
1144         dev_geo(dev, "Fix camera S_CROP for %dx%d@%d:%d to %dx%d@%d:%d\n",
1145                 cam_rect->width, cam_rect->height,
1146                 cam_rect->left, cam_rect->top,
1147                 rect->width, rect->height, rect->left, rect->top);
1148
1149         /* We need sensor maximum rectangle */
1150         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1151         if (ret < 0)
1152                 return ret;
1153
1154         /* Put user requested rectangle within sensor bounds */
1155         soc_camera_limit_side(&rect->left, &rect->width, cap.bounds.left, 2,
1156                               cap.bounds.width);
1157         soc_camera_limit_side(&rect->top, &rect->height, cap.bounds.top, 4,
1158                               cap.bounds.height);
1159
1160         /*
1161          * Popular special case - some cameras can only handle fixed sizes like
1162          * QVGA, VGA,... Take care to avoid infinite loop.
1163          */
1164         width = max(cam_rect->width, 2);
1165         height = max(cam_rect->height, 2);
1166
1167         /*
1168          * Loop as long as sensor is not covering the requested rectangle and
1169          * is still within its bounds
1170          */
1171         while (!ret && (is_smaller(cam_rect, rect) ||
1172                         is_inside(cam_rect, rect)) &&
1173                (cap.bounds.width > width || cap.bounds.height > height)) {
1174
1175                 width *= 2;
1176                 height *= 2;
1177
1178                 cam_rect->width = width;
1179                 cam_rect->height = height;
1180
1181                 /*
1182                  * We do not know what capabilities the camera has to set up
1183                  * left and top borders. We could try to be smarter in iterating
1184                  * them, e.g., if camera current left is to the right of the
1185                  * target left, set it to the middle point between the current
1186                  * left and minimum left. But that would add too much
1187                  * complexity: we would have to iterate each border separately.
1188                  * Instead we just drop to the left and top bounds.
1189                  */
1190                 if (cam_rect->left > rect->left)
1191                         cam_rect->left = cap.bounds.left;
1192
1193                 if (cam_rect->left + cam_rect->width < rect->left + rect->width)
1194                         cam_rect->width = rect->left + rect->width -
1195                                 cam_rect->left;
1196
1197                 if (cam_rect->top > rect->top)
1198                         cam_rect->top = cap.bounds.top;
1199
1200                 if (cam_rect->top + cam_rect->height < rect->top + rect->height)
1201                         cam_rect->height = rect->top + rect->height -
1202                                 cam_rect->top;
1203
1204                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1205                 ret = client_g_rect(sd, cam_rect);
1206                 dev_geo(dev, "Camera S_CROP %d for %dx%d@%d:%d\n", ret,
1207                         cam_rect->width, cam_rect->height,
1208                         cam_rect->left, cam_rect->top);
1209         }
1210
1211         /* S_CROP must not modify the rectangle */
1212         if (is_smaller(cam_rect, rect) || is_inside(cam_rect, rect)) {
1213                 /*
1214                  * The camera failed to configure a suitable cropping,
1215                  * we cannot use the current rectangle, set to max
1216                  */
1217                 *cam_rect = cap.bounds;
1218                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1219                 ret = client_g_rect(sd, cam_rect);
1220                 dev_geo(dev, "Camera S_CROP %d for max %dx%d@%d:%d\n", ret,
1221                         cam_rect->width, cam_rect->height,
1222                         cam_rect->left, cam_rect->top);
1223         }
1224
1225         if (!ret) {
1226                 cam->rect = *cam_rect;
1227                 update_subrect(cam);
1228         }
1229
1230         return ret;
1231 }
1232
1233 /* Iterative s_mbus_fmt, also updates cached client crop on success */
1234 static int client_s_fmt(struct soc_camera_device *icd,
1235                         struct v4l2_mbus_framefmt *mf, bool ceu_can_scale)
1236 {
1237         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1238         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1239         struct device *dev = icd->dev.parent;
1240         unsigned int width = mf->width, height = mf->height, tmp_w, tmp_h;
1241         unsigned int max_width, max_height;
1242         struct v4l2_cropcap cap;
1243         int ret;
1244
1245         ret = v4l2_device_call_until_err(sd->v4l2_dev, 0, video,
1246                                          s_mbus_fmt, mf);
1247         if (ret < 0)
1248                 return ret;
1249
1250         dev_geo(dev, "camera scaled to %ux%u\n", mf->width, mf->height);
1251
1252         if ((width == mf->width && height == mf->height) || !ceu_can_scale)
1253                 goto update_cache;
1254
1255         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1256
1257         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1258         if (ret < 0)
1259                 return ret;
1260
1261         max_width = min(cap.bounds.width, 2560);
1262         max_height = min(cap.bounds.height, 1920);
1263
1264         /* Camera set a format, but geometry is not precise, try to improve */
1265         tmp_w = mf->width;
1266         tmp_h = mf->height;
1267
1268         /* width <= max_width && height <= max_height - guaranteed by try_fmt */
1269         while ((width > tmp_w || height > tmp_h) &&
1270                tmp_w < max_width && tmp_h < max_height) {
1271                 tmp_w = min(2 * tmp_w, max_width);
1272                 tmp_h = min(2 * tmp_h, max_height);
1273                 mf->width = tmp_w;
1274                 mf->height = tmp_h;
1275                 ret = v4l2_device_call_until_err(sd->v4l2_dev, 0, video,
1276                                                  s_mbus_fmt, mf);
1277                 dev_geo(dev, "Camera scaled to %ux%u\n",
1278                         mf->width, mf->height);
1279                 if (ret < 0) {
1280                         /* This shouldn't happen */
1281                         dev_err(dev, "Client failed to set format: %d\n", ret);
1282                         return ret;
1283                 }
1284         }
1285
1286 update_cache:
1287         /* Update cache */
1288         ret = client_g_rect(sd, &cam->rect);
1289         if (ret < 0)
1290                 return ret;
1291
1292         update_subrect(cam);
1293
1294         return 0;
1295 }
1296
1297 /**
1298  * @width       - on output: user width, mapped back to input
1299  * @height      - on output: user height, mapped back to input
1300  * @mf          - in- / output camera output window
1301  */
1302 static int client_scale(struct soc_camera_device *icd,
1303                         struct v4l2_mbus_framefmt *mf,
1304                         unsigned int *width, unsigned int *height,
1305                         bool ceu_can_scale)
1306 {
1307         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1308         struct device *dev = icd->dev.parent;
1309         struct v4l2_mbus_framefmt mf_tmp = *mf;
1310         unsigned int scale_h, scale_v;
1311         int ret;
1312
1313         /*
1314          * 5. Apply iterative camera S_FMT for camera user window (also updates
1315          *    client crop cache and the imaginary sub-rectangle).
1316          */
1317         ret = client_s_fmt(icd, &mf_tmp, ceu_can_scale);
1318         if (ret < 0)
1319                 return ret;
1320
1321         dev_geo(dev, "5: camera scaled to %ux%u\n",
1322                 mf_tmp.width, mf_tmp.height);
1323
1324         /* 6. Retrieve camera output window (g_fmt) */
1325
1326         /* unneeded - it is already in "mf_tmp" */
1327
1328         /* 7. Calculate new client scales. */
1329         scale_h = calc_generic_scale(cam->rect.width, mf_tmp.width);
1330         scale_v = calc_generic_scale(cam->rect.height, mf_tmp.height);
1331
1332         mf->width       = mf_tmp.width;
1333         mf->height      = mf_tmp.height;
1334         mf->colorspace  = mf_tmp.colorspace;
1335
1336         /*
1337          * 8. Calculate new CEU crop - apply camera scales to previously
1338          *    updated "effective" crop.
1339          */
1340         *width = scale_down(cam->subrect.width, scale_h);
1341         *height = scale_down(cam->subrect.height, scale_v);
1342
1343         dev_geo(dev, "8: new client sub-window %ux%u\n", *width, *height);
1344
1345         return 0;
1346 }
1347
1348 /*
1349  * CEU can scale and crop, but we don't want to waste bandwidth and kill the
1350  * framerate by always requesting the maximum image from the client. See
1351  * Documentation/video4linux/sh_mobile_camera_ceu.txt for a description of
1352  * scaling and cropping algorithms and for the meaning of referenced here steps.
1353  */
1354 static int sh_mobile_ceu_set_crop(struct soc_camera_device *icd,
1355                                   struct v4l2_crop *a)
1356 {
1357         struct v4l2_rect *rect = &a->c;
1358         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1359         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1360         struct v4l2_crop cam_crop;
1361         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1362         struct v4l2_rect *cam_rect = &cam_crop.c;
1363         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1364         struct device *dev = icd->dev.parent;
1365         struct v4l2_mbus_framefmt mf;
1366         unsigned int scale_cam_h, scale_cam_v, scale_ceu_h, scale_ceu_v,
1367                 out_width, out_height, scale_h, scale_v;
1368         int interm_width, interm_height;
1369         u32 capsr, cflcr;
1370         int ret;
1371
1372         dev_geo(dev, "S_CROP(%ux%u@%u:%u)\n", rect->width, rect->height,
1373                 rect->left, rect->top);
1374
1375         /* During camera cropping its output window can change too, stop CEU */
1376         capsr = capture_save_reset(pcdev);
1377         dev_dbg(dev, "CAPSR 0x%x, CFLCR 0x%x\n", capsr, pcdev->cflcr);
1378
1379         /* 1. - 2. Apply iterative camera S_CROP for new input window. */
1380         ret = client_s_crop(icd, a, &cam_crop);
1381         if (ret < 0)
1382                 return ret;
1383
1384         dev_geo(dev, "1-2: camera cropped to %ux%u@%u:%u\n",
1385                 cam_rect->width, cam_rect->height,
1386                 cam_rect->left, cam_rect->top);
1387
1388         /* On success cam_crop contains current camera crop */
1389
1390         /* 3. Retrieve camera output window */
1391         ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
1392         if (ret < 0)
1393                 return ret;
1394
1395         if (mf.width > 2560 || mf.height > 1920)
1396                 return -EINVAL;
1397
1398         /* Cache camera output window */
1399         cam->width      = mf.width;
1400         cam->height     = mf.height;
1401
1402         /* 4. Calculate camera scales */
1403         scale_cam_h     = calc_generic_scale(cam_rect->width, mf.width);
1404         scale_cam_v     = calc_generic_scale(cam_rect->height, mf.height);
1405
1406         /* Calculate intermediate window */
1407         interm_width    = scale_down(rect->width, scale_cam_h);
1408         interm_height   = scale_down(rect->height, scale_cam_v);
1409
1410         if (pcdev->image_mode) {
1411                 out_width       = min(interm_width, icd->user_width);
1412                 out_height      = min(interm_height, icd->user_height);
1413         } else {
1414                 out_width       = interm_width;
1415                 out_height      = interm_height;
1416         }
1417
1418         /*
1419          * 5. Calculate CEU scales from camera scales from results of (5) and
1420          *    the user window
1421          */
1422         scale_ceu_h     = calc_scale(interm_width, &out_width);
1423         scale_ceu_v     = calc_scale(interm_height, &out_height);
1424
1425         /* Calculate camera scales */
1426         scale_h         = calc_generic_scale(cam_rect->width, out_width);
1427         scale_v         = calc_generic_scale(cam_rect->height, out_height);
1428
1429         dev_geo(dev, "5: CEU scales %u:%u\n", scale_ceu_h, scale_ceu_v);
1430
1431         /* Apply CEU scales. */
1432         cflcr = scale_ceu_h | (scale_ceu_v << 16);
1433         if (cflcr != pcdev->cflcr) {
1434                 pcdev->cflcr = cflcr;
1435                 ceu_write(pcdev, CFLCR, cflcr);
1436         }
1437
1438         icd->user_width  = out_width;
1439         icd->user_height = out_height;
1440         cam->ceu_left    = scale_down(rect->left - cam_rect->left, scale_h) & ~1;
1441         cam->ceu_top     = scale_down(rect->top - cam_rect->top, scale_v) & ~1;
1442
1443         /* 6. Use CEU cropping to crop to the new window. */
1444         sh_mobile_ceu_set_rect(icd);
1445
1446         cam->subrect = *rect;
1447
1448         dev_geo(dev, "6: CEU cropped to %ux%u@%u:%u\n",
1449                 icd->user_width, icd->user_height,
1450                 cam->ceu_left, cam->ceu_top);
1451
1452         /* Restore capture */
1453         if (pcdev->active)
1454                 capsr |= 1;
1455         capture_restore(pcdev, capsr);
1456
1457         /* Even if only camera cropping succeeded */
1458         return ret;
1459 }
1460
1461 static int sh_mobile_ceu_get_crop(struct soc_camera_device *icd,
1462                                   struct v4l2_crop *a)
1463 {
1464         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1465
1466         a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1467         a->c = cam->subrect;
1468
1469         return 0;
1470 }
1471
1472 /*
1473  * Calculate real client output window by applying new scales to the current
1474  * client crop. New scales are calculated from the requested output format and
1475  * CEU crop, mapped backed onto the client input (subrect).
1476  */
1477 static void calculate_client_output(struct soc_camera_device *icd,
1478                 struct v4l2_pix_format *pix, struct v4l2_mbus_framefmt *mf)
1479 {
1480         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1481         struct device *dev = icd->dev.parent;
1482         struct v4l2_rect *cam_subrect = &cam->subrect;
1483         unsigned int scale_v, scale_h;
1484
1485         if (cam_subrect->width == cam->rect.width &&
1486             cam_subrect->height == cam->rect.height) {
1487                 /* No sub-cropping */
1488                 mf->width       = pix->width;
1489                 mf->height      = pix->height;
1490                 return;
1491         }
1492
1493         /* 1.-2. Current camera scales and subwin - cached. */
1494
1495         dev_geo(dev, "2: subwin %ux%u@%u:%u\n",
1496                 cam_subrect->width, cam_subrect->height,
1497                 cam_subrect->left, cam_subrect->top);
1498
1499         /*
1500          * 3. Calculate new combined scales from input sub-window to requested
1501          *    user window.
1502          */
1503
1504         /*
1505          * TODO: CEU cannot scale images larger than VGA to smaller than SubQCIF
1506          * (128x96) or larger than VGA
1507          */
1508         scale_h = calc_generic_scale(cam_subrect->width, pix->width);
1509         scale_v = calc_generic_scale(cam_subrect->height, pix->height);
1510
1511         dev_geo(dev, "3: scales %u:%u\n", scale_h, scale_v);
1512
1513         /*
1514          * 4. Calculate client output window by applying combined scales to real
1515          *    input window.
1516          */
1517         mf->width       = scale_down(cam->rect.width, scale_h);
1518         mf->height      = scale_down(cam->rect.height, scale_v);
1519 }
1520
1521 /* Similar to set_crop multistage iterative algorithm */
1522 static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
1523                                  struct v4l2_format *f)
1524 {
1525         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1526         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1527         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1528         struct v4l2_pix_format *pix = &f->fmt.pix;
1529         struct v4l2_mbus_framefmt mf;
1530         struct device *dev = icd->dev.parent;
1531         __u32 pixfmt = pix->pixelformat;
1532         const struct soc_camera_format_xlate *xlate;
1533         /* Keep Compiler Happy */
1534         unsigned int ceu_sub_width = 0, ceu_sub_height = 0;
1535         u16 scale_v, scale_h;
1536         int ret;
1537         bool image_mode;
1538         enum v4l2_field field;
1539
1540         dev_geo(dev, "S_FMT(pix=0x%x, %ux%u)\n", pixfmt, pix->width, pix->height);
1541
1542         switch (pix->field) {
1543         default:
1544                 pix->field = V4L2_FIELD_NONE;
1545                 /* fall-through */
1546         case V4L2_FIELD_INTERLACED_TB:
1547         case V4L2_FIELD_INTERLACED_BT:
1548         case V4L2_FIELD_NONE:
1549                 field = pix->field;
1550                 break;
1551         case V4L2_FIELD_INTERLACED:
1552                 field = V4L2_FIELD_INTERLACED_TB;
1553                 break;
1554         }
1555
1556         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1557         if (!xlate) {
1558                 dev_warn(dev, "Format %x not found\n", pixfmt);
1559                 return -EINVAL;
1560         }
1561
1562         /* 1.-4. Calculate client output geometry */
1563         calculate_client_output(icd, &f->fmt.pix, &mf);
1564         mf.field        = pix->field;
1565         mf.colorspace   = pix->colorspace;
1566         mf.code         = xlate->code;
1567
1568         switch (pixfmt) {
1569         case V4L2_PIX_FMT_NV12:
1570         case V4L2_PIX_FMT_NV21:
1571         case V4L2_PIX_FMT_NV16:
1572         case V4L2_PIX_FMT_NV61:
1573                 image_mode = true;
1574                 break;
1575         default:
1576                 image_mode = false;
1577         }
1578
1579         dev_geo(dev, "4: request camera output %ux%u\n", mf.width, mf.height);
1580
1581         /* 5. - 9. */
1582         ret = client_scale(icd, &mf, &ceu_sub_width, &ceu_sub_height,
1583                            image_mode && V4L2_FIELD_NONE == field);
1584
1585         dev_geo(dev, "5-9: client scale return %d\n", ret);
1586
1587         /* Done with the camera. Now see if we can improve the result */
1588
1589         dev_geo(dev, "fmt %ux%u, requested %ux%u\n",
1590                 mf.width, mf.height, pix->width, pix->height);
1591         if (ret < 0)
1592                 return ret;
1593
1594         if (mf.code != xlate->code)
1595                 return -EINVAL;
1596
1597         /* 9. Prepare CEU crop */
1598         cam->width = mf.width;
1599         cam->height = mf.height;
1600
1601         /* 10. Use CEU scaling to scale to the requested user window. */
1602
1603         /* We cannot scale up */
1604         if (pix->width > ceu_sub_width)
1605                 ceu_sub_width = pix->width;
1606
1607         if (pix->height > ceu_sub_height)
1608                 ceu_sub_height = pix->height;
1609
1610         pix->colorspace = mf.colorspace;
1611
1612         if (image_mode) {
1613                 /* Scale pix->{width x height} down to width x height */
1614                 scale_h         = calc_scale(ceu_sub_width, &pix->width);
1615                 scale_v         = calc_scale(ceu_sub_height, &pix->height);
1616         } else {
1617                 pix->width      = ceu_sub_width;
1618                 pix->height     = ceu_sub_height;
1619                 scale_h         = 0;
1620                 scale_v         = 0;
1621         }
1622
1623         pcdev->cflcr = scale_h | (scale_v << 16);
1624
1625         /*
1626          * We have calculated CFLCR, the actual configuration will be performed
1627          * in sh_mobile_ceu_set_bus_param()
1628          */
1629
1630         dev_geo(dev, "10: W: %u : 0x%x = %u, H: %u : 0x%x = %u\n",
1631                 ceu_sub_width, scale_h, pix->width,
1632                 ceu_sub_height, scale_v, pix->height);
1633
1634         cam->code               = xlate->code;
1635         icd->current_fmt        = xlate;
1636
1637         pcdev->field = field;
1638         pcdev->image_mode = image_mode;
1639
1640         return 0;
1641 }
1642
1643 static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
1644                                  struct v4l2_format *f)
1645 {
1646         const struct soc_camera_format_xlate *xlate;
1647         struct v4l2_pix_format *pix = &f->fmt.pix;
1648         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1649         struct v4l2_mbus_framefmt mf;
1650         __u32 pixfmt = pix->pixelformat;
1651         int width, height;
1652         int ret;
1653
1654         dev_geo(icd->dev.parent, "TRY_FMT(pix=0x%x, %ux%u)\n",
1655                  pixfmt, pix->width, pix->height);
1656
1657         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1658         if (!xlate) {
1659                 dev_warn(icd->dev.parent, "Format %x not found\n", pixfmt);
1660                 return -EINVAL;
1661         }
1662
1663         /* FIXME: calculate using depth and bus width */
1664
1665         v4l_bound_align_image(&pix->width, 2, 2560, 1,
1666                               &pix->height, 4, 1920, 2, 0);
1667
1668         width = pix->width;
1669         height = pix->height;
1670
1671         pix->bytesperline = soc_mbus_bytes_per_line(width, xlate->host_fmt);
1672         if ((int)pix->bytesperline < 0)
1673                 return pix->bytesperline;
1674         pix->sizeimage = height * pix->bytesperline;
1675
1676         /* limit to sensor capabilities */
1677         mf.width        = pix->width;
1678         mf.height       = pix->height;
1679         mf.field        = pix->field;
1680         mf.code         = xlate->code;
1681         mf.colorspace   = pix->colorspace;
1682
1683         ret = v4l2_device_call_until_err(sd->v4l2_dev, 0, video, try_mbus_fmt, &mf);
1684         if (ret < 0)
1685                 return ret;
1686
1687         pix->width      = mf.width;
1688         pix->height     = mf.height;
1689         pix->field      = mf.field;
1690         pix->colorspace = mf.colorspace;
1691
1692         switch (pixfmt) {
1693         case V4L2_PIX_FMT_NV12:
1694         case V4L2_PIX_FMT_NV21:
1695         case V4L2_PIX_FMT_NV16:
1696         case V4L2_PIX_FMT_NV61:
1697                 /* FIXME: check against rect_max after converting soc-camera */
1698                 /* We can scale precisely, need a bigger image from camera */
1699                 if (pix->width < width || pix->height < height) {
1700                         /*
1701                          * We presume, the sensor behaves sanely, i.e., if
1702                          * requested a bigger rectangle, it will not return a
1703                          * smaller one.
1704                          */
1705                         mf.width = 2560;
1706                         mf.height = 1920;
1707                         ret = v4l2_device_call_until_err(sd->v4l2_dev, 0, video,
1708                                                          try_mbus_fmt, &mf);
1709                         if (ret < 0) {
1710                                 /* Shouldn't actually happen... */
1711                                 dev_err(icd->dev.parent,
1712                                         "FIXME: client try_fmt() = %d\n", ret);
1713                                 return ret;
1714                         }
1715                 }
1716                 /* We will scale exactly */
1717                 if (mf.width > width)
1718                         pix->width = width;
1719                 if (mf.height > height)
1720                         pix->height = height;
1721         }
1722
1723         dev_geo(icd->dev.parent, "%s(): return %d, fmt 0x%x, %ux%u\n",
1724                 __func__, ret, pix->pixelformat, pix->width, pix->height);
1725
1726         return ret;
1727 }
1728
1729 static int sh_mobile_ceu_reqbufs(struct soc_camera_file *icf,
1730                                  struct v4l2_requestbuffers *p)
1731 {
1732         int i;
1733
1734         /*
1735          * This is for locking debugging only. I removed spinlocks and now I
1736          * check whether .prepare is ever called on a linked buffer, or whether
1737          * a dma IRQ can occur for an in-work or unlinked buffer. Until now
1738          * it hadn't triggered
1739          */
1740         for (i = 0; i < p->count; i++) {
1741                 struct sh_mobile_ceu_buffer *buf;
1742
1743                 buf = container_of(icf->vb_vidq.bufs[i],
1744                                    struct sh_mobile_ceu_buffer, vb);
1745                 INIT_LIST_HEAD(&buf->vb.queue);
1746         }
1747
1748         return 0;
1749 }
1750
1751 static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
1752 {
1753         struct soc_camera_file *icf = file->private_data;
1754         struct sh_mobile_ceu_buffer *buf;
1755
1756         buf = list_entry(icf->vb_vidq.stream.next,
1757                          struct sh_mobile_ceu_buffer, vb.stream);
1758
1759         poll_wait(file, &buf->vb.done, pt);
1760
1761         if (buf->vb.state == VIDEOBUF_DONE ||
1762             buf->vb.state == VIDEOBUF_ERROR)
1763                 return POLLIN|POLLRDNORM;
1764
1765         return 0;
1766 }
1767
1768 static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
1769                                   struct v4l2_capability *cap)
1770 {
1771         strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
1772         cap->version = KERNEL_VERSION(0, 0, 5);
1773         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1774         return 0;
1775 }
1776
1777 static void sh_mobile_ceu_init_videobuf(struct videobuf_queue *q,
1778                                         struct soc_camera_device *icd)
1779 {
1780         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1781         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1782
1783         videobuf_queue_dma_contig_init(q,
1784                                        &sh_mobile_ceu_videobuf_ops,
1785                                        icd->dev.parent, &pcdev->lock,
1786                                        V4L2_BUF_TYPE_VIDEO_CAPTURE,
1787                                        pcdev->field,
1788                                        sizeof(struct sh_mobile_ceu_buffer),
1789                                        icd);
1790 }
1791
1792 static int sh_mobile_ceu_get_parm(struct soc_camera_device *icd,
1793                                   struct v4l2_streamparm *parm)
1794 {
1795         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1796
1797         return v4l2_subdev_call(sd, video, g_parm, parm);
1798 }
1799
1800 static int sh_mobile_ceu_set_parm(struct soc_camera_device *icd,
1801                                   struct v4l2_streamparm *parm)
1802 {
1803         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1804
1805         return v4l2_subdev_call(sd, video, s_parm, parm);
1806 }
1807
1808 static int sh_mobile_ceu_get_ctrl(struct soc_camera_device *icd,
1809                                   struct v4l2_control *ctrl)
1810 {
1811         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1812         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1813         u32 val;
1814
1815         switch (ctrl->id) {
1816         case V4L2_CID_SHARPNESS:
1817                 val = ceu_read(pcdev, CLFCR);
1818                 ctrl->value = val ^ 1;
1819                 return 0;
1820         }
1821         return -ENOIOCTLCMD;
1822 }
1823
1824 static int sh_mobile_ceu_set_ctrl(struct soc_camera_device *icd,
1825                                   struct v4l2_control *ctrl)
1826 {
1827         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1828         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1829
1830         switch (ctrl->id) {
1831         case V4L2_CID_SHARPNESS:
1832                 switch (icd->current_fmt->host_fmt->fourcc) {
1833                 case V4L2_PIX_FMT_NV12:
1834                 case V4L2_PIX_FMT_NV21:
1835                 case V4L2_PIX_FMT_NV16:
1836                 case V4L2_PIX_FMT_NV61:
1837                         ceu_write(pcdev, CLFCR, !ctrl->value);
1838                         return 0;
1839                 }
1840                 return -EINVAL;
1841         }
1842         return -ENOIOCTLCMD;
1843 }
1844
1845 static const struct v4l2_queryctrl sh_mobile_ceu_controls[] = {
1846         {
1847                 .id             = V4L2_CID_SHARPNESS,
1848                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
1849                 .name           = "Low-pass filter",
1850                 .minimum        = 0,
1851                 .maximum        = 1,
1852                 .step           = 1,
1853                 .default_value  = 0,
1854         },
1855 };
1856
1857 static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
1858         .owner          = THIS_MODULE,
1859         .add            = sh_mobile_ceu_add_device,
1860         .remove         = sh_mobile_ceu_remove_device,
1861         .get_formats    = sh_mobile_ceu_get_formats,
1862         .put_formats    = sh_mobile_ceu_put_formats,
1863         .get_crop       = sh_mobile_ceu_get_crop,
1864         .set_crop       = sh_mobile_ceu_set_crop,
1865         .set_fmt        = sh_mobile_ceu_set_fmt,
1866         .try_fmt        = sh_mobile_ceu_try_fmt,
1867         .set_ctrl       = sh_mobile_ceu_set_ctrl,
1868         .get_ctrl       = sh_mobile_ceu_get_ctrl,
1869         .set_parm       = sh_mobile_ceu_set_parm,
1870         .get_parm       = sh_mobile_ceu_get_parm,
1871         .reqbufs        = sh_mobile_ceu_reqbufs,
1872         .poll           = sh_mobile_ceu_poll,
1873         .querycap       = sh_mobile_ceu_querycap,
1874         .set_bus_param  = sh_mobile_ceu_set_bus_param,
1875         .init_videobuf  = sh_mobile_ceu_init_videobuf,
1876         .controls       = sh_mobile_ceu_controls,
1877         .num_controls   = ARRAY_SIZE(sh_mobile_ceu_controls),
1878 };
1879
1880 struct bus_wait {
1881         struct notifier_block   notifier;
1882         struct completion       completion;
1883         struct device           *dev;
1884 };
1885
1886 static int bus_notify(struct notifier_block *nb,
1887                       unsigned long action, void *data)
1888 {
1889         struct device *dev = data;
1890         struct bus_wait *wait = container_of(nb, struct bus_wait, notifier);
1891
1892         if (wait->dev != dev)
1893                 return NOTIFY_DONE;
1894
1895         switch (action) {
1896         case BUS_NOTIFY_UNBOUND_DRIVER:
1897                 /* Protect from module unloading */
1898                 wait_for_completion(&wait->completion);
1899                 return NOTIFY_OK;
1900         }
1901         return NOTIFY_DONE;
1902 }
1903
1904 static int __devinit sh_mobile_ceu_probe(struct platform_device *pdev)
1905 {
1906         struct sh_mobile_ceu_dev *pcdev;
1907         struct resource *res;
1908         void __iomem *base;
1909         unsigned int irq;
1910         int err = 0;
1911         struct bus_wait wait = {
1912                 .completion = COMPLETION_INITIALIZER_ONSTACK(wait.completion),
1913                 .notifier.notifier_call = bus_notify,
1914         };
1915         struct device *csi2;
1916
1917         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1918         irq = platform_get_irq(pdev, 0);
1919         if (!res || (int)irq <= 0) {
1920                 dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
1921                 err = -ENODEV;
1922                 goto exit;
1923         }
1924
1925         pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
1926         if (!pcdev) {
1927                 dev_err(&pdev->dev, "Could not allocate pcdev\n");
1928                 err = -ENOMEM;
1929                 goto exit;
1930         }
1931
1932         INIT_LIST_HEAD(&pcdev->capture);
1933         spin_lock_init(&pcdev->lock);
1934
1935         pcdev->pdata = pdev->dev.platform_data;
1936         if (!pcdev->pdata) {
1937                 err = -EINVAL;
1938                 dev_err(&pdev->dev, "CEU platform data not set.\n");
1939                 goto exit_kfree;
1940         }
1941
1942         base = ioremap_nocache(res->start, resource_size(res));
1943         if (!base) {
1944                 err = -ENXIO;
1945                 dev_err(&pdev->dev, "Unable to ioremap CEU registers.\n");
1946                 goto exit_kfree;
1947         }
1948
1949         pcdev->irq = irq;
1950         pcdev->base = base;
1951         pcdev->video_limit = 0; /* only enabled if second resource exists */
1952
1953         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1954         if (res) {
1955                 err = dma_declare_coherent_memory(&pdev->dev, res->start,
1956                                                   res->start,
1957                                                   resource_size(res),
1958                                                   DMA_MEMORY_MAP |
1959                                                   DMA_MEMORY_EXCLUSIVE);
1960                 if (!err) {
1961                         dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
1962                         err = -ENXIO;
1963                         goto exit_iounmap;
1964                 }
1965
1966                 pcdev->video_limit = resource_size(res);
1967         }
1968
1969         /* request irq */
1970         err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED,
1971                           dev_name(&pdev->dev), pcdev);
1972         if (err) {
1973                 dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
1974                 goto exit_release_mem;
1975         }
1976
1977         pm_suspend_ignore_children(&pdev->dev, true);
1978         pm_runtime_enable(&pdev->dev);
1979         pm_runtime_resume(&pdev->dev);
1980
1981         pcdev->ici.priv = pcdev;
1982         pcdev->ici.v4l2_dev.dev = &pdev->dev;
1983         pcdev->ici.nr = pdev->id;
1984         pcdev->ici.drv_name = dev_name(&pdev->dev);
1985         pcdev->ici.ops = &sh_mobile_ceu_host_ops;
1986
1987         /* CSI2 interfacing */
1988         csi2 = pcdev->pdata->csi2_dev;
1989         if (csi2) {
1990                 wait.dev = csi2;
1991
1992                 err = bus_register_notifier(&platform_bus_type, &wait.notifier);
1993                 if (err < 0)
1994                         goto exit_free_clk;
1995
1996                 /*
1997                  * From this point the driver module will not unload, until
1998                  * we complete the completion.
1999                  */
2000
2001                 if (!csi2->driver || !csi2->driver->owner) {
2002                         complete(&wait.completion);
2003                         /* Either too late, or probing failed */
2004                         bus_unregister_notifier(&platform_bus_type, &wait.notifier);
2005                         err = -ENXIO;
2006                         goto exit_free_clk;
2007                 }
2008
2009                 /*
2010                  * The module is still loaded, in the worst case it is hanging
2011                  * in device release on our completion. So, _now_ dereferencing
2012                  * the "owner" is safe!
2013                  */
2014
2015                 err = try_module_get(csi2->driver->owner);
2016
2017                 /* Let notifier complete, if it has been locked */
2018                 complete(&wait.completion);
2019                 bus_unregister_notifier(&platform_bus_type, &wait.notifier);
2020                 if (!err) {
2021                         err = -ENODEV;
2022                         goto exit_free_clk;
2023                 }
2024         }
2025
2026         err = soc_camera_host_register(&pcdev->ici);
2027         if (err)
2028                 goto exit_module_put;
2029
2030         return 0;
2031
2032 exit_module_put:
2033         if (csi2 && csi2->driver)
2034                 module_put(csi2->driver->owner);
2035 exit_free_clk:
2036         pm_runtime_disable(&pdev->dev);
2037         free_irq(pcdev->irq, pcdev);
2038 exit_release_mem:
2039         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
2040                 dma_release_declared_memory(&pdev->dev);
2041 exit_iounmap:
2042         iounmap(base);
2043 exit_kfree:
2044         kfree(pcdev);
2045 exit:
2046         return err;
2047 }
2048
2049 static int __devexit sh_mobile_ceu_remove(struct platform_device *pdev)
2050 {
2051         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
2052         struct sh_mobile_ceu_dev *pcdev = container_of(soc_host,
2053                                         struct sh_mobile_ceu_dev, ici);
2054         struct device *csi2 = pcdev->pdata->csi2_dev;
2055
2056         soc_camera_host_unregister(soc_host);
2057         pm_runtime_disable(&pdev->dev);
2058         free_irq(pcdev->irq, pcdev);
2059         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
2060                 dma_release_declared_memory(&pdev->dev);
2061         iounmap(pcdev->base);
2062         if (csi2 && csi2->driver)
2063                 module_put(csi2->driver->owner);
2064         kfree(pcdev);
2065
2066         return 0;
2067 }
2068
2069 static int sh_mobile_ceu_runtime_nop(struct device *dev)
2070 {
2071         /* Runtime PM callback shared between ->runtime_suspend()
2072          * and ->runtime_resume(). Simply returns success.
2073          *
2074          * This driver re-initializes all registers after
2075          * pm_runtime_get_sync() anyway so there is no need
2076          * to save and restore registers here.
2077          */
2078         return 0;
2079 }
2080
2081 static const struct dev_pm_ops sh_mobile_ceu_dev_pm_ops = {
2082         .runtime_suspend = sh_mobile_ceu_runtime_nop,
2083         .runtime_resume = sh_mobile_ceu_runtime_nop,
2084 };
2085
2086 static struct platform_driver sh_mobile_ceu_driver = {
2087         .driver         = {
2088                 .name   = "sh_mobile_ceu",
2089                 .pm     = &sh_mobile_ceu_dev_pm_ops,
2090         },
2091         .probe          = sh_mobile_ceu_probe,
2092         .remove         = __devexit_p(sh_mobile_ceu_remove),
2093 };
2094
2095 static int __init sh_mobile_ceu_init(void)
2096 {
2097         /* Whatever return code */
2098         request_module("sh_mobile_csi2");
2099         return platform_driver_register(&sh_mobile_ceu_driver);
2100 }
2101
2102 static void __exit sh_mobile_ceu_exit(void)
2103 {
2104         platform_driver_unregister(&sh_mobile_ceu_driver);
2105 }
2106
2107 module_init(sh_mobile_ceu_init);
2108 module_exit(sh_mobile_ceu_exit);
2109
2110 MODULE_DESCRIPTION("SuperH Mobile CEU driver");
2111 MODULE_AUTHOR("Magnus Damm");
2112 MODULE_LICENSE("GPL");
2113 MODULE_ALIAS("platform:sh_mobile_ceu");