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/completion.h>
  21 #include <linux/delay.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/errno.h>
  24 #include <linux/fs.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/kernel.h>
  27 #include <linux/mm.h>
  28 #include <linux/moduleparam.h>
  29 #include <linux/time.h>
  30 #include <linux/version.h>
  31 #include <linux/slab.h>
  32 #include <linux/device.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/videodev2.h>
  35 #include <linux/pm_runtime.h>
  36 #include <linux/sched.h>
  37
  38 #include <media/v4l2-common.h>
  39 #include <media/v4l2-dev.h>
  40 #include <media/soc_camera.h>
  41 #include <media/sh_mobile_ceu.h>
  42 #include <media/videobuf2-dma-contig.h>
  43 #include <media/v4l2-mediabus.h>
  44 #include <media/soc_mediabus.h>
  45
  46 /* register offsets for sh7722 / sh7723 */
  47
  48 #define CAPSR  0x00 /* Capture start register */
  49 #define CAPCR  0x04 /* Capture control register */
  50 #define CAMCR  0x08 /* Capture interface control register */
  51 #define CMCYR  0x0c /* Capture interface cycle  register */
  52 #define CAMOR  0x10 /* Capture interface offset register */
  53 #define CAPWR  0x14 /* Capture interface width register */
  54 #define CAIFR  0x18 /* Capture interface input format register */
  55 #define CSTCR  0x20 /* Camera strobe control register (<= sh7722) */
  56 #define CSECR  0x24 /* Camera strobe emission count register (<= sh7722) */
  57 #define CRCNTR 0x28 /* CEU register control register */
  58 #define CRCMPR 0x2c /* CEU register forcible control register */
  59 #define CFLCR  0x30 /* Capture filter control register */
  60 #define CFSZR  0x34 /* Capture filter size clip register */
  61 #define CDWDR  0x38 /* Capture destination width register */
  62 #define CDAYR  0x3c /* Capture data address Y register */
  63 #define CDACR  0x40 /* Capture data address C register */
  64 #define CDBYR  0x44 /* Capture data bottom-field address Y register */
  65 #define CDBCR  0x48 /* Capture data bottom-field address C register */
  66 #define CBDSR  0x4c /* Capture bundle destination size register */
  67 #define CFWCR  0x5c /* Firewall operation control register */
  68 #define CLFCR  0x60 /* Capture low-pass filter control register */
  69 #define CDOCR  0x64 /* Capture data output control register */
  70 #define CDDCR  0x68 /* Capture data complexity level register */
  71 #define CDDAR  0x6c /* Capture data complexity level address register */
  72 #define CEIER  0x70 /* Capture event interrupt enable register */
  73 #define CETCR  0x74 /* Capture event flag clear register */
  74 #define CSTSR  0x7c /* Capture status register */
  75 #define CSRTR  0x80 /* Capture software reset register */
  76 #define CDSSR  0x84 /* Capture data size register */
  77 #define CDAYR2 0x90 /* Capture data address Y register 2 */
  78 #define CDACR2 0x94 /* Capture data address C register 2 */
  79 #define CDBYR2 0x98 /* Capture data bottom-field address Y register 2 */
  80 #define CDBCR2 0x9c /* Capture data bottom-field address C register 2 */
  81
  82 #undef DEBUG_GEOMETRY
  83 #ifdef DEBUG_GEOMETRY
  84 #define dev_geo dev_info
  85 #else
  86 #define dev_geo dev_dbg
  87 #endif
  88
  89 /* per video frame buffer */
  90 struct sh_mobile_ceu_buffer {
  91         struct vb2_buffer vb; /* v4l buffer must be first */
  92         struct list_head queue;
  93         enum v4l2_mbus_pixelcode code;
  94 };
  95
  96 struct sh_mobile_ceu_dev {
  97         struct soc_camera_host ici;
  98         struct soc_camera_device *icd;
  99
 100         unsigned int irq;
 101         void __iomem *base;
 102         unsigned long video_limit;
 103
 104         spinlock_t lock;                /* Protects video buffer lists */
 105         struct list_head capture;
 106         struct vb2_buffer *active;
 107         struct vb2_alloc_ctx *alloc_ctx;
 108
 109         struct sh_mobile_ceu_info *pdata;
 110         struct completion complete;
 111
 112         u32 cflcr;
 113
 114         enum v4l2_field field;
 115         int sequence;
 116
 117         unsigned int image_mode:1;
 118         unsigned int is_16bit:1;
 119         unsigned int frozen:1;
 120 };
 121
 122 struct sh_mobile_ceu_cam {
 123         /* CEU offsets within scaled by the CEU camera output */
 124         unsigned int ceu_left;
 125         unsigned int ceu_top;
 126         /* Client output, as seen by the CEU */
 127         unsigned int width;
 128         unsigned int height;
 129         /*
 130          * User window from S_CROP / G_CROP, produced by client cropping and
 131          * scaling, CEU scaling and CEU cropping, mapped back onto the client
 132          * input window
 133          */
 134         struct v4l2_rect subrect;
 135         /* Camera cropping rectangle */
 136         struct v4l2_rect rect;
 137         const struct soc_mbus_pixelfmt *extra_fmt;
 138         enum v4l2_mbus_pixelcode code;
 139 };
 140
 141 static struct sh_mobile_ceu_buffer *to_ceu_vb(struct vb2_buffer *vb)
 142 {
 143         return container_of(vb, struct sh_mobile_ceu_buffer, vb);
 144 }
 145
 146 static unsigned long make_bus_param(struct sh_mobile_ceu_dev *pcdev)
 147 {
 148         unsigned long flags;
 149
 150         flags = SOCAM_MASTER |
 151                 SOCAM_PCLK_SAMPLE_RISING |
 152                 SOCAM_HSYNC_ACTIVE_HIGH |
 153                 SOCAM_HSYNC_ACTIVE_LOW |
 154                 SOCAM_VSYNC_ACTIVE_HIGH |
 155                 SOCAM_VSYNC_ACTIVE_LOW |
 156                 SOCAM_DATA_ACTIVE_HIGH;
 157
 158         if (pcdev->pdata->flags & SH_CEU_FLAG_USE_8BIT_BUS)
 159                 flags |= SOCAM_DATAWIDTH_8;
 160
 161         if (pcdev->pdata->flags & SH_CEU_FLAG_USE_16BIT_BUS)
 162                 flags |= SOCAM_DATAWIDTH_16;
 163
 164         if (flags & SOCAM_DATAWIDTH_MASK)
 165                 return flags;
 166
 167         return 0;
 168 }
 169
 170 static void ceu_write(struct sh_mobile_ceu_dev *priv,
 171                       unsigned long reg_offs, u32 data)
 172 {
 173         iowrite32(data, priv->base + reg_offs);
 174 }
 175
 176 static u32 ceu_read(struct sh_mobile_ceu_dev *priv, unsigned long reg_offs)
 177 {
 178         return ioread32(priv->base + reg_offs);
 179 }
 180
 181 static int sh_mobile_ceu_soft_reset(struct sh_mobile_ceu_dev *pcdev)
 182 {
 183         int i, success = 0;
 184         struct soc_camera_device *icd = pcdev->icd;
 185
 186         ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
 187
 188         /* wait CSTSR.CPTON bit */
 189         for (i = 0; i < 1000; i++) {
 190                 if (!(ceu_read(pcdev, CSTSR) & 1)) {
 191                         success++;
 192                         break;
 193                 }
 194                 udelay(1);
 195         }
 196
 197         /* wait CAPSR.CPKIL bit */
 198         for (i = 0; i < 1000; i++) {
 199                 if (!(ceu_read(pcdev, CAPSR) & (1 << 16))) {
 200                         success++;
 201                         break;
 202                 }
 203                 udelay(1);
 204         }
 205
 206
 207         if (2 != success) {
 208                 dev_warn(&icd->dev, "soft reset time out\n");
 209                 return -EIO;
 210         }
 211
 212         return 0;
 213 }
 214
 215 /*
 216  *  Videobuf operations
 217  */
 218 static int sh_mobile_ceu_videobuf_setup(struct vb2_queue *vq,
 219                         unsigned int *count, unsigned int *num_planes,
 220                         unsigned long sizes[], void *alloc_ctxs[])
 221 {
 222         struct soc_camera_device *icd = container_of(vq, struct soc_camera_device, vb2_vidq);
 223         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 224         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 225         int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 226                                                 icd->current_fmt->host_fmt);
 227
 228         if (bytes_per_line < 0)
 229                 return bytes_per_line;
 230
 231         *num_planes = 1;
 232
 233         pcdev->sequence = 0;
 234         sizes[0] = bytes_per_line * icd->user_height;
 235         alloc_ctxs[0] = pcdev->alloc_ctx;
 236
 237         if (!*count)
 238                 *count = 2;
 239
 240         if (pcdev->video_limit) {
 241                 if (PAGE_ALIGN(sizes[0]) * *count > pcdev->video_limit)
 242                         *count = pcdev->video_limit / PAGE_ALIGN(sizes[0]);
 243         }
 244
 245         dev_dbg(icd->dev.parent, "count=%d, size=%lu\n", *count, sizes[0]);
 246
 247         return 0;
 248 }
 249
 250 #define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */
 251 #define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */
 252 #define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */
 253 #define CEU_CEIER_VBP   (1 << 20) /* vbp error */
 254 #define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */
 255 #define CEU_CEIER_MASK (CEU_CEIER_CPEIE | CEU_CEIER_VBP)
 256
 257
 258 /*
 259  * return value doesn't reflex the success/failure to queue the new buffer,
 260  * but rather the status of the previous buffer.
 261  */
 262 static int sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
 263 {
 264         struct soc_camera_device *icd = pcdev->icd;
 265         dma_addr_t phys_addr_top, phys_addr_bottom;
 266         unsigned long top1, top2;
 267         unsigned long bottom1, bottom2;
 268         u32 status;
 269         int ret = 0;
 270
 271         /*
 272          * The hardware is _very_ picky about this sequence. Especially
 273          * the CEU_CETCR_MAGIC value. It seems like we need to acknowledge
 274          * several not-so-well documented interrupt sources in CETCR.
 275          */
 276         ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_MASK);
 277         status = ceu_read(pcdev, CETCR);
 278         ceu_write(pcdev, CETCR, ~status & CEU_CETCR_MAGIC);
 279         if (!pcdev->frozen)
 280                 ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_MASK);
 281         ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP);
 282         ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW);
 283
 284         /*
 285          * When a VBP interrupt occurs, a capture end interrupt does not occur
 286          * and the image of that frame is not captured correctly. So, soft reset
 287          * is needed here.
 288          */
 289         if (status & CEU_CEIER_VBP) {
 290                 sh_mobile_ceu_soft_reset(pcdev);
 291                 ret = -EIO;
 292         }
 293
 294         if (pcdev->frozen) {
 295                 complete(&pcdev->complete);
 296                 return ret;
 297         }
 298
 299         if (!pcdev->active)
 300                 return ret;
 301
 302         if (V4L2_FIELD_INTERLACED_BT == pcdev->field) {
 303                 top1    = CDBYR;
 304                 top2    = CDBCR;
 305                 bottom1 = CDAYR;
 306                 bottom2 = CDACR;
 307         } else {
 308                 top1    = CDAYR;
 309                 top2    = CDACR;
 310                 bottom1 = CDBYR;
 311                 bottom2 = CDBCR;
 312         }
 313
 314         phys_addr_top = vb2_dma_contig_plane_paddr(pcdev->active, 0);
 315
 316         ceu_write(pcdev, top1, phys_addr_top);
 317         if (V4L2_FIELD_NONE != pcdev->field) {
 318                 phys_addr_bottom = phys_addr_top + icd->user_width;
 319                 ceu_write(pcdev, bottom1, phys_addr_bottom);
 320         }
 321
 322         switch (icd->current_fmt->host_fmt->fourcc) {
 323         case V4L2_PIX_FMT_NV12:
 324         case V4L2_PIX_FMT_NV21:
 325         case V4L2_PIX_FMT_NV16:
 326         case V4L2_PIX_FMT_NV61:
 327                 phys_addr_top += icd->user_width *
 328                         icd->user_height;
 329                 ceu_write(pcdev, top2, phys_addr_top);
 330                 if (V4L2_FIELD_NONE != pcdev->field) {
 331                         phys_addr_bottom = phys_addr_top + icd->user_width;
 332                         ceu_write(pcdev, bottom2, phys_addr_bottom);
 333                 }
 334         }
 335
 336         ceu_write(pcdev, CAPSR, 0x1); /* start capture */
 337
 338         return ret;
 339 }
 340
 341 static int sh_mobile_ceu_videobuf_prepare(struct vb2_buffer *vb)
 342 {
 343         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
 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         unsigned long size;
 348
 349         if (bytes_per_line < 0)
 350                 return bytes_per_line;
 351
 352         buf = to_ceu_vb(vb);
 353
 354         dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
 355                 vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
 356
 357         /* Added list head initialization on alloc */
 358         WARN(!list_empty(&buf->queue), "Buffer %p on queue!\n", vb);
 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         if (vb2_plane_vaddr(vb, 0))
 366                 memset(vb2_plane_vaddr(vb, 0), 0xaa, vb2_get_plane_payload(vb, 0));
 367 #endif
 368
 369         BUG_ON(NULL == icd->current_fmt);
 370
 371         size = icd->user_height * bytes_per_line;
 372
 373         if (vb2_plane_size(vb, 0) < size) {
 374                 dev_err(icd->dev.parent, "Buffer too small (%lu < %lu)\n",
 375                         vb2_plane_size(vb, 0), size);
 376                 return -ENOBUFS;
 377         }
 378
 379         vb2_set_plane_payload(vb, 0, size);
 380
 381         return 0;
 382 }
 383
 384 static void sh_mobile_ceu_videobuf_queue(struct vb2_buffer *vb)
 385 {
 386         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
 387         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 388         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 389         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb);
 390
 391         dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
 392                 vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
 393
 394         spin_lock_irq(&pcdev->lock);
 395         list_add_tail(&buf->queue, &pcdev->capture);
 396
 397         if (!pcdev->active) {
 398                 /*
 399                  * Because there were no active buffer at this moment,
 400                  * we are not interested in the return value of
 401                  * sh_mobile_ceu_capture here.
 402                  */
 403                 pcdev->active = vb;
 404                 sh_mobile_ceu_capture(pcdev);
 405         }
 406         spin_unlock_irq(&pcdev->lock);
 407 }
 408
 409 static void sh_mobile_ceu_videobuf_release(struct vb2_buffer *vb)
 410 {
 411         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
 412         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 413         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb);
 414         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 415
 416         spin_lock_irq(&pcdev->lock);
 417
 418         if (pcdev->active == vb) {
 419                 /* disable capture (release DMA buffer), reset */
 420                 ceu_write(pcdev, CAPSR, 1 << 16);
 421                 pcdev->active = NULL;
 422         }
 423
 424         /* Doesn't hurt also if the list is empty */
 425         list_del_init(&buf->queue);
 426
 427         spin_unlock_irq(&pcdev->lock);
 428 }
 429
 430 static int sh_mobile_ceu_videobuf_init(struct vb2_buffer *vb)
 431 {
 432         /* This is for locking debugging only */
 433         INIT_LIST_HEAD(&to_ceu_vb(vb)->queue);
 434         return 0;
 435 }
 436
 437 static int sh_mobile_ceu_stop_streaming(struct vb2_queue *q)
 438 {
 439         struct soc_camera_device *icd = container_of(q, struct soc_camera_device, vb2_vidq);
 440         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 441         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 442         struct list_head *buf_head, *tmp;
 443
 444         spin_lock_irq(&pcdev->lock);
 445
 446         pcdev->active = NULL;
 447
 448         list_for_each_safe(buf_head, tmp, &pcdev->capture)
 449                 list_del_init(buf_head);
 450
 451         spin_unlock_irq(&pcdev->lock);
 452
 453         return sh_mobile_ceu_soft_reset(pcdev);
 454 }
 455
 456 static struct vb2_ops sh_mobile_ceu_videobuf_ops = {
 457         .queue_setup    = sh_mobile_ceu_videobuf_setup,
 458         .buf_prepare    = sh_mobile_ceu_videobuf_prepare,
 459         .buf_queue      = sh_mobile_ceu_videobuf_queue,
 460         .buf_cleanup    = sh_mobile_ceu_videobuf_release,
 461         .buf_init       = sh_mobile_ceu_videobuf_init,
 462         .wait_prepare   = soc_camera_unlock,
 463         .wait_finish    = soc_camera_lock,
 464         .stop_streaming = sh_mobile_ceu_stop_streaming,
 465 };
 466
 467 static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
 468 {
 469         struct sh_mobile_ceu_dev *pcdev = data;
 470         struct vb2_buffer *vb;
 471         int ret;
 472
 473         spin_lock(&pcdev->lock);
 474
 475         vb = pcdev->active;
 476         if (!vb)
 477                 /* Stale interrupt from a released buffer */
 478                 goto out;
 479
 480         list_del_init(&to_ceu_vb(vb)->queue);
 481
 482         if (!list_empty(&pcdev->capture))
 483                 pcdev->active = &list_entry(pcdev->capture.next,
 484                                             struct sh_mobile_ceu_buffer, queue)->vb;
 485         else
 486                 pcdev->active = NULL;
 487
 488         ret = sh_mobile_ceu_capture(pcdev);
 489         do_gettimeofday(&vb->v4l2_buf.timestamp);
 490         if (!ret) {
 491                 vb->v4l2_buf.field = pcdev->field;
 492                 vb->v4l2_buf.sequence = pcdev->sequence++;
 493         }
 494         vb2_buffer_done(vb, ret < 0 ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 495
 496 out:
 497         spin_unlock(&pcdev->lock);
 498
 499         return IRQ_HANDLED;
 500 }
 501
 502 /* Called with .video_lock held */
 503 static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
 504 {
 505         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 506         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 507         int ret;
 508
 509         if (pcdev->icd)
 510                 return -EBUSY;
 511
 512         dev_info(icd->dev.parent,
 513                  "SuperH Mobile CEU driver attached to camera %d\n",
 514                  icd->devnum);
 515
 516         pm_runtime_get_sync(ici->v4l2_dev.dev);
 517
 518         ret = sh_mobile_ceu_soft_reset(pcdev);
 519         if (!ret)
 520                 pcdev->icd = icd;
 521
 522         return ret;
 523 }
 524
 525 /* Called with .video_lock held */
 526 static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
 527 {
 528         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 529         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 530
 531         BUG_ON(icd != pcdev->icd);
 532
 533         /* disable capture, disable interrupts */
 534         ceu_write(pcdev, CEIER, 0);
 535         sh_mobile_ceu_soft_reset(pcdev);
 536
 537         /* make sure active buffer is canceled */
 538         spin_lock_irq(&pcdev->lock);
 539         if (pcdev->active) {
 540                 list_del_init(&to_ceu_vb(pcdev->active)->queue);
 541                 vb2_buffer_done(pcdev->active, VB2_BUF_STATE_ERROR);
 542                 pcdev->active = NULL;
 543         }
 544         spin_unlock_irq(&pcdev->lock);
 545
 546         pm_runtime_put_sync(ici->v4l2_dev.dev);
 547
 548         dev_info(icd->dev.parent,
 549                  "SuperH Mobile CEU driver detached from camera %d\n",
 550                  icd->devnum);
 551
 552         pcdev->icd = NULL;
 553 }
 554
 555 /*
 556  * See chapter 29.4.12 "Capture Filter Control Register (CFLCR)"
 557  * in SH7722 Hardware Manual
 558  */
 559 static unsigned int size_dst(unsigned int src, unsigned int scale)
 560 {
 561         unsigned int mant_pre = scale >> 12;
 562         if (!src || !scale)
 563                 return src;
 564         return ((mant_pre + 2 * (src - 1)) / (2 * mant_pre) - 1) *
 565                 mant_pre * 4096 / scale + 1;
 566 }
 567
 568 static u16 calc_scale(unsigned int src, unsigned int *dst)
 569 {
 570         u16 scale;
 571
 572         if (src == *dst)
 573                 return 0;
 574
 575         scale = (src * 4096 / *dst) & ~7;
 576
 577         while (scale > 4096 && size_dst(src, scale) < *dst)
 578                 scale -= 8;
 579
 580         *dst = size_dst(src, scale);
 581
 582         return scale;
 583 }
 584
 585 /* rect is guaranteed to not exceed the scaled camera rectangle */
 586 static void sh_mobile_ceu_set_rect(struct soc_camera_device *icd)
 587 {
 588         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 589         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 590         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 591         unsigned int height, width, cdwdr_width, in_width, in_height;
 592         unsigned int left_offset, top_offset;
 593         u32 camor;
 594
 595         dev_geo(icd->dev.parent, "Crop %ux%u@%u:%u\n",
 596                 icd->user_width, icd->user_height, cam->ceu_left, cam->ceu_top);
 597
 598         left_offset     = cam->ceu_left;
 599         top_offset      = cam->ceu_top;
 600
 601         /* CEU cropping (CFSZR) is applied _after_ the scaling filter (CFLCR) */
 602         if (pcdev->image_mode) {
 603                 in_width = cam->width;
 604                 if (!pcdev->is_16bit) {
 605                         in_width *= 2;
 606                         left_offset *= 2;
 607                 }
 608                 width = icd->user_width;
 609                 cdwdr_width = icd->user_width;
 610         } else {
 611                 int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 612                                                 icd->current_fmt->host_fmt);
 613                 unsigned int w_factor;
 614
 615                 width = icd->user_width;
 616
 617                 switch (icd->current_fmt->host_fmt->packing) {
 618                 case SOC_MBUS_PACKING_2X8_PADHI:
 619                         w_factor = 2;
 620                         break;
 621                 default:
 622                         w_factor = 1;
 623                 }
 624
 625                 in_width = cam->width * w_factor;
 626                 left_offset = left_offset * w_factor;
 627
 628                 if (bytes_per_line < 0)
 629                         cdwdr_width = icd->user_width;
 630                 else
 631                         cdwdr_width = bytes_per_line;
 632         }
 633
 634         height = icd->user_height;
 635         in_height = cam->height;
 636         if (V4L2_FIELD_NONE != pcdev->field) {
 637                 height /= 2;
 638                 in_height /= 2;
 639                 top_offset /= 2;
 640                 cdwdr_width *= 2;
 641         }
 642
 643         /* CSI2 special configuration */
 644         if (pcdev->pdata->csi2_dev) {
 645                 in_width = ((in_width - 2) * 2);
 646                 left_offset *= 2;
 647         }
 648
 649         /* Set CAMOR, CAPWR, CFSZR, take care of CDWDR */
 650         camor = left_offset | (top_offset << 16);
 651
 652         dev_geo(icd->dev.parent,
 653                 "CAMOR 0x%x, CAPWR 0x%x, CFSZR 0x%x, CDWDR 0x%x\n", camor,
 654                 (in_height << 16) | in_width, (height << 16) | width,
 655                 cdwdr_width);
 656
 657         ceu_write(pcdev, CAMOR, camor);
 658         ceu_write(pcdev, CAPWR, (in_height << 16) | in_width);
 659         ceu_write(pcdev, CFSZR, (height << 16) | width);
 660         ceu_write(pcdev, CDWDR, cdwdr_width);
 661 }
 662
 663 static u32 capture_save_reset(struct sh_mobile_ceu_dev *pcdev)
 664 {
 665         u32 capsr = ceu_read(pcdev, CAPSR);
 666         ceu_write(pcdev, CAPSR, 1 << 16); /* reset, stop capture */
 667         return capsr;
 668 }
 669
 670 static void capture_restore(struct sh_mobile_ceu_dev *pcdev, u32 capsr)
 671 {
 672         unsigned long timeout = jiffies + 10 * HZ;
 673
 674         /*
 675          * Wait until the end of the current frame. It can take a long time,
 676          * but if it has been aborted by a CAPSR reset, it shoule exit sooner.
 677          */
 678         while ((ceu_read(pcdev, CSTSR) & 1) && time_before(jiffies, timeout))
 679                 msleep(1);
 680
 681         if (time_after(jiffies, timeout)) {
 682                 dev_err(pcdev->ici.v4l2_dev.dev,
 683                         "Timeout waiting for frame end! Interface problem?\n");
 684                 return;
 685         }
 686
 687         /* Wait until reset clears, this shall not hang... */
 688         while (ceu_read(pcdev, CAPSR) & (1 << 16))
 689                 udelay(10);
 690
 691         /* Anything to restore? */
 692         if (capsr & ~(1 << 16))
 693                 ceu_write(pcdev, CAPSR, capsr);
 694 }
 695
 696 /* Capture is not running, no interrupts, no locking needed */
 697 static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
 698                                        __u32 pixfmt)
 699 {
 700         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 701         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 702         int ret;
 703         unsigned long camera_flags, common_flags, value;
 704         int yuv_lineskip;
 705         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 706         u32 capsr = capture_save_reset(pcdev);
 707
 708         camera_flags = icd->ops->query_bus_param(icd);
 709         common_flags = soc_camera_bus_param_compatible(camera_flags,
 710                                                        make_bus_param(pcdev));
 711         if (!common_flags)
 712                 return -EINVAL;
 713
 714         /* Make choises, based on platform preferences */
 715         if ((common_flags & SOCAM_HSYNC_ACTIVE_HIGH) &&
 716             (common_flags & SOCAM_HSYNC_ACTIVE_LOW)) {
 717                 if (pcdev->pdata->flags & SH_CEU_FLAG_HSYNC_LOW)
 718                         common_flags &= ~SOCAM_HSYNC_ACTIVE_HIGH;
 719                 else
 720                         common_flags &= ~SOCAM_HSYNC_ACTIVE_LOW;
 721         }
 722
 723         if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) &&
 724             (common_flags & SOCAM_VSYNC_ACTIVE_LOW)) {
 725                 if (pcdev->pdata->flags & SH_CEU_FLAG_VSYNC_LOW)
 726                         common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH;
 727                 else
 728                         common_flags &= ~SOCAM_VSYNC_ACTIVE_LOW;
 729         }
 730
 731         ret = icd->ops->set_bus_param(icd, common_flags);
 732         if (ret < 0)
 733                 return ret;
 734
 735         switch (common_flags & SOCAM_DATAWIDTH_MASK) {
 736         case SOCAM_DATAWIDTH_8:
 737                 pcdev->is_16bit = 0;
 738                 break;
 739         case SOCAM_DATAWIDTH_16:
 740                 pcdev->is_16bit = 1;
 741                 break;
 742         default:
 743                 return -EINVAL;
 744         }
 745
 746         ceu_write(pcdev, CRCNTR, 0);
 747         ceu_write(pcdev, CRCMPR, 0);
 748
 749         value = 0x00000010; /* data fetch by default */
 750         yuv_lineskip = 0;
 751
 752         switch (icd->current_fmt->host_fmt->fourcc) {
 753         case V4L2_PIX_FMT_NV12:
 754         case V4L2_PIX_FMT_NV21:
 755                 yuv_lineskip = 1; /* skip for NV12/21, no skip for NV16/61 */
 756                 /* fall-through */
 757         case V4L2_PIX_FMT_NV16:
 758         case V4L2_PIX_FMT_NV61:
 759                 switch (cam->code) {
 760                 case V4L2_MBUS_FMT_UYVY8_2X8:
 761                         value = 0x00000000; /* Cb0, Y0, Cr0, Y1 */
 762                         break;
 763                 case V4L2_MBUS_FMT_VYUY8_2X8:
 764                         value = 0x00000100; /* Cr0, Y0, Cb0, Y1 */
 765                         break;
 766                 case V4L2_MBUS_FMT_YUYV8_2X8:
 767                         value = 0x00000200; /* Y0, Cb0, Y1, Cr0 */
 768                         break;
 769                 case V4L2_MBUS_FMT_YVYU8_2X8:
 770                         value = 0x00000300; /* Y0, Cr0, Y1, Cb0 */
 771                         break;
 772                 default:
 773                         BUG();
 774                 }
 775         }
 776
 777         if (icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV21 ||
 778             icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV61)
 779                 value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */
 780
 781         value |= common_flags & SOCAM_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
 782         value |= common_flags & SOCAM_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
 783         value |= pcdev->is_16bit ? 1 << 12 : 0;
 784
 785         /* CSI2 mode */
 786         if (pcdev->pdata->csi2_dev)
 787                 value |= 3 << 12;
 788
 789         ceu_write(pcdev, CAMCR, value);
 790
 791         ceu_write(pcdev, CAPCR, 0x00300000);
 792
 793         switch (pcdev->field) {
 794         case V4L2_FIELD_INTERLACED_TB:
 795                 value = 0x101;
 796                 break;
 797         case V4L2_FIELD_INTERLACED_BT:
 798                 value = 0x102;
 799                 break;
 800         default:
 801                 value = 0;
 802                 break;
 803         }
 804         ceu_write(pcdev, CAIFR, value);
 805
 806         sh_mobile_ceu_set_rect(icd);
 807         mdelay(1);
 808
 809         dev_geo(icd->dev.parent, "CFLCR 0x%x\n", pcdev->cflcr);
 810         ceu_write(pcdev, CFLCR, pcdev->cflcr);
 811
 812         /*
 813          * A few words about byte order (observed in Big Endian mode)
 814          *
 815          * In data fetch mode bytes are received in chunks of 8 bytes.
 816          * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
 817          *
 818          * The data is however by default written to memory in reverse order:
 819          * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
 820          *
 821          * The lowest three bits of CDOCR allows us to do swapping,
 822          * using 7 we swap the data bytes to match the incoming order:
 823          * D0, D1, D2, D3, D4, D5, D6, D7
 824          */
 825         value = 0x00000017;
 826         if (yuv_lineskip)
 827                 value &= ~0x00000010; /* convert 4:2:2 -> 4:2:0 */
 828
 829         ceu_write(pcdev, CDOCR, value);
 830         ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
 831
 832         dev_dbg(icd->dev.parent, "S_FMT successful for %c%c%c%c %ux%u\n",
 833                 pixfmt & 0xff, (pixfmt >> 8) & 0xff,
 834                 (pixfmt >> 16) & 0xff, (pixfmt >> 24) & 0xff,
 835                 icd->user_width, icd->user_height);
 836
 837         capture_restore(pcdev, capsr);
 838
 839         /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
 840         return 0;
 841 }
 842
 843 static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd,
 844                                        unsigned char buswidth)
 845 {
 846         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 847         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 848         unsigned long camera_flags, common_flags;
 849
 850         camera_flags = icd->ops->query_bus_param(icd);
 851         common_flags = soc_camera_bus_param_compatible(camera_flags,
 852                                                        make_bus_param(pcdev));
 853         if (!common_flags || buswidth > 16 ||
 854             (buswidth > 8 && !(common_flags & SOCAM_DATAWIDTH_16)))
 855                 return -EINVAL;
 856
 857         return 0;
 858 }
 859
 860 static const struct soc_mbus_pixelfmt sh_mobile_ceu_formats[] = {
 861         {
 862                 .fourcc                 = V4L2_PIX_FMT_NV12,
 863                 .name                   = "NV12",
 864                 .bits_per_sample        = 12,
 865                 .packing                = SOC_MBUS_PACKING_NONE,
 866                 .order                  = SOC_MBUS_ORDER_LE,
 867         }, {
 868                 .fourcc                 = V4L2_PIX_FMT_NV21,
 869                 .name                   = "NV21",
 870                 .bits_per_sample        = 12,
 871                 .packing                = SOC_MBUS_PACKING_NONE,
 872                 .order                  = SOC_MBUS_ORDER_LE,
 873         }, {
 874                 .fourcc                 = V4L2_PIX_FMT_NV16,
 875                 .name                   = "NV16",
 876                 .bits_per_sample        = 16,
 877                 .packing                = SOC_MBUS_PACKING_NONE,
 878                 .order                  = SOC_MBUS_ORDER_LE,
 879         }, {
 880                 .fourcc                 = V4L2_PIX_FMT_NV61,
 881                 .name                   = "NV61",
 882                 .bits_per_sample        = 16,
 883                 .packing                = SOC_MBUS_PACKING_NONE,
 884                 .order                  = SOC_MBUS_ORDER_LE,
 885         },
 886 };
 887
 888 /* This will be corrected as we get more formats */
 889 static bool sh_mobile_ceu_packing_supported(const struct soc_mbus_pixelfmt *fmt)
 890 {
 891         return  fmt->packing == SOC_MBUS_PACKING_NONE ||
 892                 (fmt->bits_per_sample == 8 &&
 893                  fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
 894                 (fmt->bits_per_sample > 8 &&
 895                  fmt->packing == SOC_MBUS_PACKING_EXTEND16);
 896 }
 897
 898 static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect);
 899
 900 static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, unsigned int idx,
 901                                      struct soc_camera_format_xlate *xlate)
 902 {
 903         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 904         struct device *dev = icd->dev.parent;
 905         struct soc_camera_host *ici = to_soc_camera_host(dev);
 906         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 907         int ret, k, n;
 908         int formats = 0;
 909         struct sh_mobile_ceu_cam *cam;
 910         enum v4l2_mbus_pixelcode code;
 911         const struct soc_mbus_pixelfmt *fmt;
 912
 913         ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
 914         if (ret < 0)
 915                 /* No more formats */
 916                 return 0;
 917
 918         fmt = soc_mbus_get_fmtdesc(code);
 919         if (!fmt) {
 920                 dev_warn(dev, "unsupported format code #%u: %d\n", idx, code);
 921                 return 0;
 922         }
 923
 924         if (!pcdev->pdata->csi2_dev) {
 925                 ret = sh_mobile_ceu_try_bus_param(icd, fmt->bits_per_sample);
 926                 if (ret < 0)
 927                         return 0;
 928         }
 929
 930         if (!icd->host_priv) {
 931                 struct v4l2_mbus_framefmt mf;
 932                 struct v4l2_rect rect;
 933                 int shift = 0;
 934
 935                 /* FIXME: subwindow is lost between close / open */
 936
 937                 /* Cache current client geometry */
 938                 ret = client_g_rect(sd, &rect);
 939                 if (ret < 0)
 940                         return ret;
 941
 942                 /* First time */
 943                 ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
 944                 if (ret < 0)
 945                         return ret;
 946
 947                 while ((mf.width > 2560 || mf.height > 1920) && shift < 4) {
 948                         /* Try 2560x1920, 1280x960, 640x480, 320x240 */
 949                         mf.width        = 2560 >> shift;
 950                         mf.height       = 1920 >> shift;
 951                         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
 952                                                          s_mbus_fmt, &mf);
 953                         if (ret < 0)
 954                                 return ret;
 955                         shift++;
 956                 }
 957
 958                 if (shift == 4) {
 959                         dev_err(dev, "Failed to configure the client below %ux%x\n",
 960                                 mf.width, mf.height);
 961                         return -EIO;
 962                 }
 963
 964                 dev_geo(dev, "camera fmt %ux%u\n", mf.width, mf.height);
 965
 966                 cam = kzalloc(sizeof(*cam), GFP_KERNEL);
 967                 if (!cam)
 968                         return -ENOMEM;
 969
 970                 /* We are called with current camera crop, initialise subrect with it */
 971                 cam->rect       = rect;
 972                 cam->subrect    = rect;
 973
 974                 cam->width      = mf.width;
 975                 cam->height     = mf.height;
 976
 977                 cam->width      = mf.width;
 978                 cam->height     = mf.height;
 979
 980                 icd->host_priv = cam;
 981         } else {
 982                 cam = icd->host_priv;
 983         }
 984
 985         /* Beginning of a pass */
 986         if (!idx)
 987                 cam->extra_fmt = NULL;
 988
 989         switch (code) {
 990         case V4L2_MBUS_FMT_UYVY8_2X8:
 991         case V4L2_MBUS_FMT_VYUY8_2X8:
 992         case V4L2_MBUS_FMT_YUYV8_2X8:
 993         case V4L2_MBUS_FMT_YVYU8_2X8:
 994                 if (cam->extra_fmt)
 995                         break;
 996
 997                 /*
 998                  * Our case is simple so far: for any of the above four camera
 999                  * formats we add all our four synthesized NV* formats, so,
1000                  * just marking the device with a single flag suffices. If
1001                  * the format generation rules are more complex, you would have
1002                  * to actually hang your already added / counted formats onto
1003                  * the host_priv pointer and check whether the format you're
1004                  * going to add now is already there.
1005                  */
1006                 cam->extra_fmt = sh_mobile_ceu_formats;
1007
1008                 n = ARRAY_SIZE(sh_mobile_ceu_formats);
1009                 formats += n;
1010                 for (k = 0; xlate && k < n; k++) {
1011                         xlate->host_fmt = &sh_mobile_ceu_formats[k];
1012                         xlate->code     = code;
1013                         xlate++;
1014                         dev_dbg(dev, "Providing format %s using code %d\n",
1015                                 sh_mobile_ceu_formats[k].name, code);
1016                 }
1017                 break;
1018         default:
1019                 if (!sh_mobile_ceu_packing_supported(fmt))
1020                         return 0;
1021         }
1022
1023         /* Generic pass-through */
1024         formats++;
1025         if (xlate) {
1026                 xlate->host_fmt = fmt;
1027                 xlate->code     = code;
1028                 xlate++;
1029                 dev_dbg(dev, "Providing format %s in pass-through mode\n",
1030                         fmt->name);
1031         }
1032
1033         return formats;
1034 }
1035
1036 static void sh_mobile_ceu_put_formats(struct soc_camera_device *icd)
1037 {
1038         kfree(icd->host_priv);
1039         icd->host_priv = NULL;
1040 }
1041
1042 /* Check if any dimension of r1 is smaller than respective one of r2 */
1043 static bool is_smaller(struct v4l2_rect *r1, struct v4l2_rect *r2)
1044 {
1045         return r1->width < r2->width || r1->height < r2->height;
1046 }
1047
1048 /* Check if r1 fails to cover r2 */
1049 static bool is_inside(struct v4l2_rect *r1, struct v4l2_rect *r2)
1050 {
1051         return r1->left > r2->left || r1->top > r2->top ||
1052                 r1->left + r1->width < r2->left + r2->width ||
1053                 r1->top + r1->height < r2->top + r2->height;
1054 }
1055
1056 static unsigned int scale_down(unsigned int size, unsigned int scale)
1057 {
1058         return (size * 4096 + scale / 2) / scale;
1059 }
1060
1061 static unsigned int calc_generic_scale(unsigned int input, unsigned int output)
1062 {
1063         return (input * 4096 + output / 2) / output;
1064 }
1065
1066 /* Get and store current client crop */
1067 static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect)
1068 {
1069         struct v4l2_crop crop;
1070         struct v4l2_cropcap cap;
1071         int ret;
1072
1073         crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1074
1075         ret = v4l2_subdev_call(sd, video, g_crop, &crop);
1076         if (!ret) {
1077                 *rect = crop.c;
1078                 return ret;
1079         }
1080
1081         /* Camera driver doesn't support .g_crop(), assume default rectangle */
1082         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1083
1084         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1085         if (!ret)
1086                 *rect = cap.defrect;
1087
1088         return ret;
1089 }
1090
1091 /* Client crop has changed, update our sub-rectangle to remain within the area */
1092 static void update_subrect(struct sh_mobile_ceu_cam *cam)
1093 {
1094         struct v4l2_rect *rect = &cam->rect, *subrect = &cam->subrect;
1095
1096         if (rect->width < subrect->width)
1097                 subrect->width = rect->width;
1098
1099         if (rect->height < subrect->height)
1100                 subrect->height = rect->height;
1101
1102         if (rect->left > subrect->left)
1103                 subrect->left = rect->left;
1104         else if (rect->left + rect->width >
1105                  subrect->left + subrect->width)
1106                 subrect->left = rect->left + rect->width -
1107                         subrect->width;
1108
1109         if (rect->top > subrect->top)
1110                 subrect->top = rect->top;
1111         else if (rect->top + rect->height >
1112                  subrect->top + subrect->height)
1113                 subrect->top = rect->top + rect->height -
1114                         subrect->height;
1115 }
1116
1117 /*
1118  * The common for both scaling and cropping iterative approach is:
1119  * 1. try if the client can produce exactly what requested by the user
1120  * 2. if (1) failed, try to double the client image until we get one big enough
1121  * 3. if (2) failed, try to request the maximum image
1122  */
1123 static int client_s_crop(struct soc_camera_device *icd, struct v4l2_crop *crop,
1124                          struct v4l2_crop *cam_crop)
1125 {
1126         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1127         struct v4l2_rect *rect = &crop->c, *cam_rect = &cam_crop->c;
1128         struct device *dev = sd->v4l2_dev->dev;
1129         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1130         struct v4l2_cropcap cap;
1131         int ret;
1132         unsigned int width, height;
1133
1134         v4l2_subdev_call(sd, video, s_crop, crop);
1135         ret = client_g_rect(sd, cam_rect);
1136         if (ret < 0)
1137                 return ret;
1138
1139         /*
1140          * Now cam_crop contains the current camera input rectangle, and it must
1141          * be within camera cropcap bounds
1142          */
1143         if (!memcmp(rect, cam_rect, sizeof(*rect))) {
1144                 /* Even if camera S_CROP failed, but camera rectangle matches */
1145                 dev_dbg(dev, "Camera S_CROP successful for %dx%d@%d:%d\n",
1146                         rect->width, rect->height, rect->left, rect->top);
1147                 cam->rect = *cam_rect;
1148                 return 0;
1149         }
1150
1151         /* Try to fix cropping, that camera hasn't managed to set */
1152         dev_geo(dev, "Fix camera S_CROP for %dx%d@%d:%d to %dx%d@%d:%d\n",
1153                 cam_rect->width, cam_rect->height,
1154                 cam_rect->left, cam_rect->top,
1155                 rect->width, rect->height, rect->left, rect->top);
1156
1157         /* We need sensor maximum rectangle */
1158         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1159         if (ret < 0)
1160                 return ret;
1161
1162         /* Put user requested rectangle within sensor bounds */
1163         soc_camera_limit_side(&rect->left, &rect->width, cap.bounds.left, 2,
1164                               cap.bounds.width);
1165         soc_camera_limit_side(&rect->top, &rect->height, cap.bounds.top, 4,
1166                               cap.bounds.height);
1167
1168         /*
1169          * Popular special case - some cameras can only handle fixed sizes like
1170          * QVGA, VGA,... Take care to avoid infinite loop.
1171          */
1172         width = max(cam_rect->width, 2);
1173         height = max(cam_rect->height, 2);
1174
1175         /*
1176          * Loop as long as sensor is not covering the requested rectangle and
1177          * is still within its bounds
1178          */
1179         while (!ret && (is_smaller(cam_rect, rect) ||
1180                         is_inside(cam_rect, rect)) &&
1181                (cap.bounds.width > width || cap.bounds.height > height)) {
1182
1183                 width *= 2;
1184                 height *= 2;
1185
1186                 cam_rect->width = width;
1187                 cam_rect->height = height;
1188
1189                 /*
1190                  * We do not know what capabilities the camera has to set up
1191                  * left and top borders. We could try to be smarter in iterating
1192                  * them, e.g., if camera current left is to the right of the
1193                  * target left, set it to the middle point between the current
1194                  * left and minimum left. But that would add too much
1195                  * complexity: we would have to iterate each border separately.
1196                  * Instead we just drop to the left and top bounds.
1197                  */
1198                 if (cam_rect->left > rect->left)
1199                         cam_rect->left = cap.bounds.left;
1200
1201                 if (cam_rect->left + cam_rect->width < rect->left + rect->width)
1202                         cam_rect->width = rect->left + rect->width -
1203                                 cam_rect->left;
1204
1205                 if (cam_rect->top > rect->top)
1206                         cam_rect->top = cap.bounds.top;
1207
1208                 if (cam_rect->top + cam_rect->height < rect->top + rect->height)
1209                         cam_rect->height = rect->top + rect->height -
1210                                 cam_rect->top;
1211
1212                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1213                 ret = client_g_rect(sd, cam_rect);
1214                 dev_geo(dev, "Camera S_CROP %d for %dx%d@%d:%d\n", ret,
1215                         cam_rect->width, cam_rect->height,
1216                         cam_rect->left, cam_rect->top);
1217         }
1218
1219         /* S_CROP must not modify the rectangle */
1220         if (is_smaller(cam_rect, rect) || is_inside(cam_rect, rect)) {
1221                 /*
1222                  * The camera failed to configure a suitable cropping,
1223                  * we cannot use the current rectangle, set to max
1224                  */
1225                 *cam_rect = cap.bounds;
1226                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1227                 ret = client_g_rect(sd, cam_rect);
1228                 dev_geo(dev, "Camera S_CROP %d for max %dx%d@%d:%d\n", ret,
1229                         cam_rect->width, cam_rect->height,
1230                         cam_rect->left, cam_rect->top);
1231         }
1232
1233         if (!ret) {
1234                 cam->rect = *cam_rect;
1235                 update_subrect(cam);
1236         }
1237
1238         return ret;
1239 }
1240
1241 /* Iterative s_mbus_fmt, also updates cached client crop on success */
1242 static int client_s_fmt(struct soc_camera_device *icd,
1243                         struct v4l2_mbus_framefmt *mf, bool ceu_can_scale)
1244 {
1245         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1246         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1247         struct device *dev = icd->dev.parent;
1248         unsigned int width = mf->width, height = mf->height, tmp_w, tmp_h;
1249         unsigned int max_width, max_height;
1250         struct v4l2_cropcap cap;
1251         int ret;
1252
1253         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
1254                                          s_mbus_fmt, mf);
1255         if (ret < 0)
1256                 return ret;
1257
1258         dev_geo(dev, "camera scaled to %ux%u\n", mf->width, mf->height);
1259
1260         if ((width == mf->width && height == mf->height) || !ceu_can_scale)
1261                 goto update_cache;
1262
1263         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1264
1265         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1266         if (ret < 0)
1267                 return ret;
1268
1269         max_width = min(cap.bounds.width, 2560);
1270         max_height = min(cap.bounds.height, 1920);
1271
1272         /* Camera set a format, but geometry is not precise, try to improve */
1273         tmp_w = mf->width;
1274         tmp_h = mf->height;
1275
1276         /* width <= max_width && height <= max_height - guaranteed by try_fmt */
1277         while ((width > tmp_w || height > tmp_h) &&
1278                tmp_w < max_width && tmp_h < max_height) {
1279                 tmp_w = min(2 * tmp_w, max_width);
1280                 tmp_h = min(2 * tmp_h, max_height);
1281                 mf->width = tmp_w;
1282                 mf->height = tmp_h;
1283                 ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
1284                                                  s_mbus_fmt, mf);
1285                 dev_geo(dev, "Camera scaled to %ux%u\n",
1286                         mf->width, mf->height);
1287                 if (ret < 0) {
1288                         /* This shouldn't happen */
1289                         dev_err(dev, "Client failed to set format: %d\n", ret);
1290                         return ret;
1291                 }
1292         }
1293
1294 update_cache:
1295         /* Update cache */
1296         ret = client_g_rect(sd, &cam->rect);
1297         if (ret < 0)
1298                 return ret;
1299
1300         update_subrect(cam);
1301
1302         return 0;
1303 }
1304
1305 /**
1306  * @width       - on output: user width, mapped back to input
1307  * @height      - on output: user height, mapped back to input
1308  * @mf          - in- / output camera output window
1309  */
1310 static int client_scale(struct soc_camera_device *icd,
1311                         struct v4l2_mbus_framefmt *mf,
1312                         unsigned int *width, unsigned int *height,
1313                         bool ceu_can_scale)
1314 {
1315         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1316         struct device *dev = icd->dev.parent;
1317         struct v4l2_mbus_framefmt mf_tmp = *mf;
1318         unsigned int scale_h, scale_v;
1319         int ret;
1320
1321         /*
1322          * 5. Apply iterative camera S_FMT for camera user window (also updates
1323          *    client crop cache and the imaginary sub-rectangle).
1324          */
1325         ret = client_s_fmt(icd, &mf_tmp, ceu_can_scale);
1326         if (ret < 0)
1327                 return ret;
1328
1329         dev_geo(dev, "5: camera scaled to %ux%u\n",
1330                 mf_tmp.width, mf_tmp.height);
1331
1332         /* 6. Retrieve camera output window (g_fmt) */
1333
1334         /* unneeded - it is already in "mf_tmp" */
1335
1336         /* 7. Calculate new client scales. */
1337         scale_h = calc_generic_scale(cam->rect.width, mf_tmp.width);
1338         scale_v = calc_generic_scale(cam->rect.height, mf_tmp.height);
1339
1340         mf->width       = mf_tmp.width;
1341         mf->height      = mf_tmp.height;
1342         mf->colorspace  = mf_tmp.colorspace;
1343
1344         /*
1345          * 8. Calculate new CEU crop - apply camera scales to previously
1346          *    updated "effective" crop.
1347          */
1348         *width = scale_down(cam->subrect.width, scale_h);
1349         *height = scale_down(cam->subrect.height, scale_v);
1350
1351         dev_geo(dev, "8: new client sub-window %ux%u\n", *width, *height);
1352
1353         return 0;
1354 }
1355
1356 /*
1357  * CEU can scale and crop, but we don't want to waste bandwidth and kill the
1358  * framerate by always requesting the maximum image from the client. See
1359  * Documentation/video4linux/sh_mobile_ceu_camera.txt for a description of
1360  * scaling and cropping algorithms and for the meaning of referenced here steps.
1361  */
1362 static int sh_mobile_ceu_set_crop(struct soc_camera_device *icd,
1363                                   struct v4l2_crop *a)
1364 {
1365         struct v4l2_rect *rect = &a->c;
1366         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1367         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1368         struct v4l2_crop cam_crop;
1369         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1370         struct v4l2_rect *cam_rect = &cam_crop.c;
1371         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1372         struct device *dev = icd->dev.parent;
1373         struct v4l2_mbus_framefmt mf;
1374         unsigned int scale_cam_h, scale_cam_v, scale_ceu_h, scale_ceu_v,
1375                 out_width, out_height;
1376         int interm_width, interm_height;
1377         u32 capsr, cflcr;
1378         int ret;
1379
1380         dev_geo(dev, "S_CROP(%ux%u@%u:%u)\n", rect->width, rect->height,
1381                 rect->left, rect->top);
1382
1383         /* During camera cropping its output window can change too, stop CEU */
1384         capsr = capture_save_reset(pcdev);
1385         dev_dbg(dev, "CAPSR 0x%x, CFLCR 0x%x\n", capsr, pcdev->cflcr);
1386
1387         /* 1. - 2. Apply iterative camera S_CROP for new input window. */
1388         ret = client_s_crop(icd, a, &cam_crop);
1389         if (ret < 0)
1390                 return ret;
1391
1392         dev_geo(dev, "1-2: camera cropped to %ux%u@%u:%u\n",
1393                 cam_rect->width, cam_rect->height,
1394                 cam_rect->left, cam_rect->top);
1395
1396         /* On success cam_crop contains current camera crop */
1397
1398         /* 3. Retrieve camera output window */
1399         ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
1400         if (ret < 0)
1401                 return ret;
1402
1403         if (mf.width > 2560 || mf.height > 1920)
1404                 return -EINVAL;
1405
1406         /* 4. Calculate camera scales */
1407         scale_cam_h     = calc_generic_scale(cam_rect->width, mf.width);
1408         scale_cam_v     = calc_generic_scale(cam_rect->height, mf.height);
1409
1410         /* Calculate intermediate window */
1411         interm_width    = scale_down(rect->width, scale_cam_h);
1412         interm_height   = scale_down(rect->height, scale_cam_v);
1413
1414         if (interm_width < icd->user_width) {
1415                 u32 new_scale_h;
1416
1417                 new_scale_h = calc_generic_scale(rect->width, icd->user_width);
1418
1419                 mf.width = scale_down(cam_rect->width, new_scale_h);
1420         }
1421
1422         if (interm_height < icd->user_height) {
1423                 u32 new_scale_v;
1424
1425                 new_scale_v = calc_generic_scale(rect->height, icd->user_height);
1426
1427                 mf.height = scale_down(cam_rect->height, new_scale_v);
1428         }
1429
1430         if (interm_width < icd->user_width || interm_height < icd->user_height) {
1431                 ret = v4l2_device_call_until_err(sd->v4l2_dev, (int)icd, video,
1432                                                  s_mbus_fmt, &mf);
1433                 if (ret < 0)
1434                         return ret;
1435
1436                 dev_geo(dev, "New camera output %ux%u\n", mf.width, mf.height);
1437                 scale_cam_h     = calc_generic_scale(cam_rect->width, mf.width);
1438                 scale_cam_v     = calc_generic_scale(cam_rect->height, mf.height);
1439                 interm_width    = scale_down(rect->width, scale_cam_h);
1440                 interm_height   = scale_down(rect->height, scale_cam_v);
1441         }
1442
1443         /* Cache camera output window */
1444         cam->width      = mf.width;
1445         cam->height     = mf.height;
1446
1447         if (pcdev->image_mode) {
1448                 out_width       = min(interm_width, icd->user_width);
1449                 out_height      = min(interm_height, icd->user_height);
1450         } else {
1451                 out_width       = interm_width;
1452                 out_height      = interm_height;
1453         }
1454
1455         /*
1456          * 5. Calculate CEU scales from camera scales from results of (5) and
1457          *    the user window
1458          */
1459         scale_ceu_h     = calc_scale(interm_width, &out_width);
1460         scale_ceu_v     = calc_scale(interm_height, &out_height);
1461
1462         dev_geo(dev, "5: CEU scales %u:%u\n", scale_ceu_h, scale_ceu_v);
1463
1464         /* Apply CEU scales. */
1465         cflcr = scale_ceu_h | (scale_ceu_v << 16);
1466         if (cflcr != pcdev->cflcr) {
1467                 pcdev->cflcr = cflcr;
1468                 ceu_write(pcdev, CFLCR, cflcr);
1469         }
1470
1471         icd->user_width  = out_width;
1472         icd->user_height = out_height;
1473         cam->ceu_left    = scale_down(rect->left - cam_rect->left, scale_cam_h) & ~1;
1474         cam->ceu_top     = scale_down(rect->top - cam_rect->top, scale_cam_v) & ~1;
1475
1476         /* 6. Use CEU cropping to crop to the new window. */
1477         sh_mobile_ceu_set_rect(icd);
1478
1479         cam->subrect = *rect;
1480
1481         dev_geo(dev, "6: CEU cropped to %ux%u@%u:%u\n",
1482                 icd->user_width, icd->user_height,
1483                 cam->ceu_left, cam->ceu_top);
1484
1485         /* Restore capture. The CE bit can be cleared by the hardware */
1486         if (pcdev->active)
1487                 capsr |= 1;
1488         capture_restore(pcdev, capsr);
1489
1490         /* Even if only camera cropping succeeded */
1491         return ret;
1492 }
1493
1494 static int sh_mobile_ceu_get_crop(struct soc_camera_device *icd,
1495                                   struct v4l2_crop *a)
1496 {
1497         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1498
1499         a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1500         a->c = cam->subrect;
1501
1502         return 0;
1503 }
1504
1505 /*
1506  * Calculate real client output window by applying new scales to the current
1507  * client crop. New scales are calculated from the requested output format and
1508  * CEU crop, mapped backed onto the client input (subrect).
1509  */
1510 static void calculate_client_output(struct soc_camera_device *icd,
1511                 struct v4l2_pix_format *pix, struct v4l2_mbus_framefmt *mf)
1512 {
1513         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1514         struct device *dev = icd->dev.parent;
1515         struct v4l2_rect *cam_subrect = &cam->subrect;
1516         unsigned int scale_v, scale_h;
1517
1518         if (cam_subrect->width == cam->rect.width &&
1519             cam_subrect->height == cam->rect.height) {
1520                 /* No sub-cropping */
1521                 mf->width       = pix->width;
1522                 mf->height      = pix->height;
1523                 return;
1524         }
1525
1526         /* 1.-2. Current camera scales and subwin - cached. */
1527
1528         dev_geo(dev, "2: subwin %ux%u@%u:%u\n",
1529                 cam_subrect->width, cam_subrect->height,
1530                 cam_subrect->left, cam_subrect->top);
1531
1532         /*
1533          * 3. Calculate new combined scales from input sub-window to requested
1534          *    user window.
1535          */
1536
1537         /*
1538          * TODO: CEU cannot scale images larger than VGA to smaller than SubQCIF
1539          * (128x96) or larger than VGA
1540          */
1541         scale_h = calc_generic_scale(cam_subrect->width, pix->width);
1542         scale_v = calc_generic_scale(cam_subrect->height, pix->height);
1543
1544         dev_geo(dev, "3: scales %u:%u\n", scale_h, scale_v);
1545
1546         /*
1547          * 4. Calculate client output window by applying combined scales to real
1548          *    input window.
1549          */
1550         mf->width       = scale_down(cam->rect.width, scale_h);
1551         mf->height      = scale_down(cam->rect.height, scale_v);
1552 }
1553
1554 /* Similar to set_crop multistage iterative algorithm */
1555 static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
1556                                  struct v4l2_format *f)
1557 {
1558         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1559         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1560         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1561         struct v4l2_pix_format *pix = &f->fmt.pix;
1562         struct v4l2_mbus_framefmt mf;
1563         struct device *dev = icd->dev.parent;
1564         __u32 pixfmt = pix->pixelformat;
1565         const struct soc_camera_format_xlate *xlate;
1566         /* Keep Compiler Happy */
1567         unsigned int ceu_sub_width = 0, ceu_sub_height = 0;
1568         u16 scale_v, scale_h;
1569         int ret;
1570         bool image_mode;
1571         enum v4l2_field field;
1572
1573         dev_geo(dev, "S_FMT(pix=0x%x, %ux%u)\n", pixfmt, pix->width, pix->height);
1574
1575         switch (pix->field) {
1576         default:
1577                 pix->field = V4L2_FIELD_NONE;
1578                 /* fall-through */
1579         case V4L2_FIELD_INTERLACED_TB:
1580         case V4L2_FIELD_INTERLACED_BT:
1581         case V4L2_FIELD_NONE:
1582                 field = pix->field;
1583                 break;
1584         case V4L2_FIELD_INTERLACED:
1585                 field = V4L2_FIELD_INTERLACED_TB;
1586                 break;
1587         }
1588
1589         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1590         if (!xlate) {
1591                 dev_warn(dev, "Format %x not found\n", pixfmt);
1592                 return -EINVAL;
1593         }
1594
1595         /* 1.-4. Calculate client output geometry */
1596         calculate_client_output(icd, &f->fmt.pix, &mf);
1597         mf.field        = pix->field;
1598         mf.colorspace   = pix->colorspace;
1599         mf.code         = xlate->code;
1600
1601         switch (pixfmt) {
1602         case V4L2_PIX_FMT_NV12:
1603         case V4L2_PIX_FMT_NV21:
1604         case V4L2_PIX_FMT_NV16:
1605         case V4L2_PIX_FMT_NV61:
1606                 image_mode = true;
1607                 break;
1608         default:
1609                 image_mode = false;
1610         }
1611
1612         dev_geo(dev, "4: request camera output %ux%u\n", mf.width, mf.height);
1613
1614         /* 5. - 9. */
1615         ret = client_scale(icd, &mf, &ceu_sub_width, &ceu_sub_height,
1616                            image_mode && V4L2_FIELD_NONE == field);
1617
1618         dev_geo(dev, "5-9: client scale return %d\n", ret);
1619
1620         /* Done with the camera. Now see if we can improve the result */
1621
1622         dev_geo(dev, "fmt %ux%u, requested %ux%u\n",
1623                 mf.width, mf.height, pix->width, pix->height);
1624         if (ret < 0)
1625                 return ret;
1626
1627         if (mf.code != xlate->code)
1628                 return -EINVAL;
1629
1630         /* 9. Prepare CEU crop */
1631         cam->width = mf.width;
1632         cam->height = mf.height;
1633
1634         /* 10. Use CEU scaling to scale to the requested user window. */
1635
1636         /* We cannot scale up */
1637         if (pix->width > ceu_sub_width)
1638                 ceu_sub_width = pix->width;
1639
1640         if (pix->height > ceu_sub_height)
1641                 ceu_sub_height = pix->height;
1642
1643         pix->colorspace = mf.colorspace;
1644
1645         if (image_mode) {
1646                 /* Scale pix->{width x height} down to width x height */
1647                 scale_h         = calc_scale(ceu_sub_width, &pix->width);
1648                 scale_v         = calc_scale(ceu_sub_height, &pix->height);
1649         } else {
1650                 pix->width      = ceu_sub_width;
1651                 pix->height     = ceu_sub_height;
1652                 scale_h         = 0;
1653                 scale_v         = 0;
1654         }
1655
1656         pcdev->cflcr = scale_h | (scale_v << 16);
1657
1658         /*
1659          * We have calculated CFLCR, the actual configuration will be performed
1660          * in sh_mobile_ceu_set_bus_param()
1661          */
1662
1663         dev_geo(dev, "10: W: %u : 0x%x = %u, H: %u : 0x%x = %u\n",
1664                 ceu_sub_width, scale_h, pix->width,
1665                 ceu_sub_height, scale_v, pix->height);
1666
1667         cam->code               = xlate->code;
1668         icd->current_fmt        = xlate;
1669
1670         pcdev->field = field;
1671         pcdev->image_mode = image_mode;
1672
1673         return 0;
1674 }
1675
1676 static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
1677                                  struct v4l2_format *f)
1678 {
1679         const struct soc_camera_format_xlate *xlate;
1680         struct v4l2_pix_format *pix = &f->fmt.pix;
1681         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1682         struct v4l2_mbus_framefmt mf;
1683         __u32 pixfmt = pix->pixelformat;
1684         int width, height;
1685         int ret;
1686
1687         dev_geo(icd->dev.parent, "TRY_FMT(pix=0x%x, %ux%u)\n",
1688                  pixfmt, pix->width, pix->height);
1689
1690         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1691         if (!xlate) {
1692                 dev_warn(icd->dev.parent, "Format %x not found\n", pixfmt);
1693                 return -EINVAL;
1694         }
1695
1696         /* FIXME: calculate using depth and bus width */
1697
1698         v4l_bound_align_image(&pix->width, 2, 2560, 1,
1699                               &pix->height, 4, 1920, 2, 0);
1700
1701         width = pix->width;
1702         height = pix->height;
1703
1704         pix->bytesperline = soc_mbus_bytes_per_line(width, xlate->host_fmt);
1705         if ((int)pix->bytesperline < 0)
1706                 return pix->bytesperline;
1707         pix->sizeimage = height * pix->bytesperline;
1708
1709         /* limit to sensor capabilities */
1710         mf.width        = pix->width;
1711         mf.height       = pix->height;
1712         mf.field        = pix->field;
1713         mf.code         = xlate->code;
1714         mf.colorspace   = pix->colorspace;
1715
1716         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video, try_mbus_fmt, &mf);
1717         if (ret < 0)
1718                 return ret;
1719
1720         pix->width      = mf.width;
1721         pix->height     = mf.height;
1722         pix->field      = mf.field;
1723         pix->colorspace = mf.colorspace;
1724
1725         switch (pixfmt) {
1726         case V4L2_PIX_FMT_NV12:
1727         case V4L2_PIX_FMT_NV21:
1728         case V4L2_PIX_FMT_NV16:
1729         case V4L2_PIX_FMT_NV61:
1730                 /* FIXME: check against rect_max after converting soc-camera */
1731                 /* We can scale precisely, need a bigger image from camera */
1732                 if (pix->width < width || pix->height < height) {
1733                         /*
1734                          * We presume, the sensor behaves sanely, i.e., if
1735                          * requested a bigger rectangle, it will not return a
1736                          * smaller one.
1737                          */
1738                         mf.width = 2560;
1739                         mf.height = 1920;
1740                         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
1741                                                          try_mbus_fmt, &mf);
1742                         if (ret < 0) {
1743                                 /* Shouldn't actually happen... */
1744                                 dev_err(icd->dev.parent,
1745                                         "FIXME: client try_fmt() = %d\n", ret);
1746                                 return ret;
1747                         }
1748                 }
1749                 /* We will scale exactly */
1750                 if (mf.width > width)
1751                         pix->width = width;
1752                 if (mf.height > height)
1753                         pix->height = height;
1754         }
1755
1756         dev_geo(icd->dev.parent, "%s(): return %d, fmt 0x%x, %ux%u\n",
1757                 __func__, ret, pix->pixelformat, pix->width, pix->height);
1758
1759         return ret;
1760 }
1761
1762 static int sh_mobile_ceu_set_livecrop(struct soc_camera_device *icd,
1763                                       struct v4l2_crop *a)
1764 {
1765         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1766         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1767         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1768         u32 out_width = icd->user_width, out_height = icd->user_height;
1769         int ret;
1770
1771         /* Freeze queue */
1772         pcdev->frozen = 1;
1773         /* Wait for frame */
1774         ret = wait_for_completion_interruptible(&pcdev->complete);
1775         /* Stop the client */
1776         ret = v4l2_subdev_call(sd, video, s_stream, 0);
1777         if (ret < 0)
1778                 dev_warn(icd->dev.parent,
1779                          "Client failed to stop the stream: %d\n", ret);
1780         else
1781                 /* Do the crop, if it fails, there's nothing more we can do */
1782                 sh_mobile_ceu_set_crop(icd, a);
1783
1784         dev_geo(icd->dev.parent, "Output after crop: %ux%u\n", icd->user_width, icd->user_height);
1785
1786         if (icd->user_width != out_width || icd->user_height != out_height) {
1787                 struct v4l2_format f = {
1788                         .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1789                         .fmt.pix        = {
1790                                 .width          = out_width,
1791                                 .height         = out_height,
1792                                 .pixelformat    = icd->current_fmt->host_fmt->fourcc,
1793                                 .field          = pcdev->field,
1794                                 .colorspace     = icd->colorspace,
1795                         },
1796                 };
1797                 ret = sh_mobile_ceu_set_fmt(icd, &f);
1798                 if (!ret && (out_width != f.fmt.pix.width ||
1799                              out_height != f.fmt.pix.height))
1800                         ret = -EINVAL;
1801                 if (!ret) {
1802                         icd->user_width         = out_width;
1803                         icd->user_height        = out_height;
1804                         ret = sh_mobile_ceu_set_bus_param(icd,
1805                                         icd->current_fmt->host_fmt->fourcc);
1806                 }
1807         }
1808
1809         /* Thaw the queue */
1810         pcdev->frozen = 0;
1811         spin_lock_irq(&pcdev->lock);
1812         sh_mobile_ceu_capture(pcdev);
1813         spin_unlock_irq(&pcdev->lock);
1814         /* Start the client */
1815         ret = v4l2_subdev_call(sd, video, s_stream, 1);
1816         return ret;
1817 }
1818
1819 static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
1820 {
1821         struct soc_camera_device *icd = file->private_data;
1822
1823         return vb2_poll(&icd->vb2_vidq, file, pt);
1824 }
1825
1826 static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
1827                                   struct v4l2_capability *cap)
1828 {
1829         strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
1830         cap->version = KERNEL_VERSION(0, 0, 5);
1831         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1832         return 0;
1833 }
1834
1835 static int sh_mobile_ceu_init_videobuf(struct vb2_queue *q,
1836                                        struct soc_camera_device *icd)
1837 {
1838         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1839         q->io_modes = VB2_MMAP | VB2_USERPTR;
1840         q->drv_priv = icd;
1841         q->ops = &sh_mobile_ceu_videobuf_ops;
1842         q->mem_ops = &vb2_dma_contig_memops;
1843         q->buf_struct_size = sizeof(struct sh_mobile_ceu_buffer);
1844
1845         return vb2_queue_init(q);
1846 }
1847
1848 static int sh_mobile_ceu_get_ctrl(struct soc_camera_device *icd,
1849                                   struct v4l2_control *ctrl)
1850 {
1851         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1852         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1853         u32 val;
1854
1855         switch (ctrl->id) {
1856         case V4L2_CID_SHARPNESS:
1857                 val = ceu_read(pcdev, CLFCR);
1858                 ctrl->value = val ^ 1;
1859                 return 0;
1860         }
1861         return -ENOIOCTLCMD;
1862 }
1863
1864 static int sh_mobile_ceu_set_ctrl(struct soc_camera_device *icd,
1865                                   struct v4l2_control *ctrl)
1866 {
1867         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1868         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1869
1870         switch (ctrl->id) {
1871         case V4L2_CID_SHARPNESS:
1872                 switch (icd->current_fmt->host_fmt->fourcc) {
1873                 case V4L2_PIX_FMT_NV12:
1874                 case V4L2_PIX_FMT_NV21:
1875                 case V4L2_PIX_FMT_NV16:
1876                 case V4L2_PIX_FMT_NV61:
1877                         ceu_write(pcdev, CLFCR, !ctrl->value);
1878                         return 0;
1879                 }
1880                 return -EINVAL;
1881         }
1882         return -ENOIOCTLCMD;
1883 }
1884
1885 static const struct v4l2_queryctrl sh_mobile_ceu_controls[] = {
1886         {
1887                 .id             = V4L2_CID_SHARPNESS,
1888                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
1889                 .name           = "Low-pass filter",
1890                 .minimum        = 0,
1891                 .maximum        = 1,
1892                 .step           = 1,
1893                 .default_value  = 0,
1894         },
1895 };
1896
1897 static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
1898         .owner          = THIS_MODULE,
1899         .add            = sh_mobile_ceu_add_device,
1900         .remove         = sh_mobile_ceu_remove_device,
1901         .get_formats    = sh_mobile_ceu_get_formats,
1902         .put_formats    = sh_mobile_ceu_put_formats,
1903         .get_crop       = sh_mobile_ceu_get_crop,
1904         .set_crop       = sh_mobile_ceu_set_crop,
1905         .set_livecrop   = sh_mobile_ceu_set_livecrop,
1906         .set_fmt        = sh_mobile_ceu_set_fmt,
1907         .try_fmt        = sh_mobile_ceu_try_fmt,
1908         .set_ctrl       = sh_mobile_ceu_set_ctrl,
1909         .get_ctrl       = sh_mobile_ceu_get_ctrl,
1910         .poll           = sh_mobile_ceu_poll,
1911         .querycap       = sh_mobile_ceu_querycap,
1912         .set_bus_param  = sh_mobile_ceu_set_bus_param,
1913         .init_videobuf2 = sh_mobile_ceu_init_videobuf,
1914         .controls       = sh_mobile_ceu_controls,
1915         .num_controls   = ARRAY_SIZE(sh_mobile_ceu_controls),
1916 };
1917
1918 struct bus_wait {
1919         struct notifier_block   notifier;
1920         struct completion       completion;
1921         struct device           *dev;
1922 };
1923
1924 static int bus_notify(struct notifier_block *nb,
1925                       unsigned long action, void *data)
1926 {
1927         struct device *dev = data;
1928         struct bus_wait *wait = container_of(nb, struct bus_wait, notifier);
1929
1930         if (wait->dev != dev)
1931                 return NOTIFY_DONE;
1932
1933         switch (action) {
1934         case BUS_NOTIFY_UNBOUND_DRIVER:
1935                 /* Protect from module unloading */
1936                 wait_for_completion(&wait->completion);
1937                 return NOTIFY_OK;
1938         }
1939         return NOTIFY_DONE;
1940 }
1941
1942 static int __devinit sh_mobile_ceu_probe(struct platform_device *pdev)
1943 {
1944         struct sh_mobile_ceu_dev *pcdev;
1945         struct resource *res;
1946         void __iomem *base;
1947         unsigned int irq;
1948         int err = 0;
1949         struct bus_wait wait = {
1950                 .completion = COMPLETION_INITIALIZER_ONSTACK(wait.completion),
1951                 .notifier.notifier_call = bus_notify,
1952         };
1953         struct device *csi2;
1954
1955         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1956         irq = platform_get_irq(pdev, 0);
1957         if (!res || (int)irq <= 0) {
1958                 dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
1959                 err = -ENODEV;
1960                 goto exit;
1961         }
1962
1963         pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
1964         if (!pcdev) {
1965                 dev_err(&pdev->dev, "Could not allocate pcdev\n");
1966                 err = -ENOMEM;
1967                 goto exit;
1968         }
1969
1970         INIT_LIST_HEAD(&pcdev->capture);
1971         spin_lock_init(&pcdev->lock);
1972         init_completion(&pcdev->complete);
1973
1974         pcdev->pdata = pdev->dev.platform_data;
1975         if (!pcdev->pdata) {
1976                 err = -EINVAL;
1977                 dev_err(&pdev->dev, "CEU platform data not set.\n");
1978                 goto exit_kfree;
1979         }
1980
1981         base = ioremap_nocache(res->start, resource_size(res));
1982         if (!base) {
1983                 err = -ENXIO;
1984                 dev_err(&pdev->dev, "Unable to ioremap CEU registers.\n");
1985                 goto exit_kfree;
1986         }
1987
1988         pcdev->irq = irq;
1989         pcdev->base = base;
1990         pcdev->video_limit = 0; /* only enabled if second resource exists */
1991
1992         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1993         if (res) {
1994                 err = dma_declare_coherent_memory(&pdev->dev, res->start,
1995                                                   res->start,
1996                                                   resource_size(res),
1997                                                   DMA_MEMORY_MAP |
1998                                                   DMA_MEMORY_EXCLUSIVE);
1999                 if (!err) {
2000                         dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
2001                         err = -ENXIO;
2002                         goto exit_iounmap;
2003                 }
2004
2005                 pcdev->video_limit = resource_size(res);
2006         }
2007
2008         /* request irq */
2009         err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED,
2010                           dev_name(&pdev->dev), pcdev);
2011         if (err) {
2012                 dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
2013                 goto exit_release_mem;
2014         }
2015
2016         pm_suspend_ignore_children(&pdev->dev, true);
2017         pm_runtime_enable(&pdev->dev);
2018         pm_runtime_resume(&pdev->dev);
2019
2020         pcdev->ici.priv = pcdev;
2021         pcdev->ici.v4l2_dev.dev = &pdev->dev;
2022         pcdev->ici.nr = pdev->id;
2023         pcdev->ici.drv_name = dev_name(&pdev->dev);
2024         pcdev->ici.ops = &sh_mobile_ceu_host_ops;
2025
2026         /* CSI2 interfacing */
2027         csi2 = pcdev->pdata->csi2_dev;
2028         if (csi2) {
2029                 wait.dev = csi2;
2030
2031                 err = bus_register_notifier(&platform_bus_type, &wait.notifier);
2032                 if (err < 0)
2033                         goto exit_free_clk;
2034
2035                 /*
2036                  * From this point the driver module will not unload, until
2037                  * we complete the completion.
2038                  */
2039
2040                 if (!csi2->driver) {
2041                         complete(&wait.completion);
2042                         /* Either too late, or probing failed */
2043                         bus_unregister_notifier(&platform_bus_type, &wait.notifier);
2044                         err = -ENXIO;
2045                         goto exit_free_clk;
2046                 }
2047
2048                 /*
2049                  * The module is still loaded, in the worst case it is hanging
2050                  * in device release on our completion. So, _now_ dereferencing
2051                  * the "owner" is safe!
2052                  */
2053
2054                 err = try_module_get(csi2->driver->owner);
2055
2056                 /* Let notifier complete, if it has been locked */
2057                 complete(&wait.completion);
2058                 bus_unregister_notifier(&platform_bus_type, &wait.notifier);
2059                 if (!err) {
2060                         err = -ENODEV;
2061                         goto exit_free_clk;
2062                 }
2063         }
2064
2065         pcdev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
2066         if (IS_ERR(pcdev->alloc_ctx)) {
2067                 err = PTR_ERR(pcdev->alloc_ctx);
2068                 goto exit_module_put;
2069         }
2070
2071         err = soc_camera_host_register(&pcdev->ici);
2072         if (err)
2073                 goto exit_free_ctx;
2074
2075         return 0;
2076
2077 exit_free_ctx:
2078         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
2079 exit_module_put:
2080         if (csi2 && csi2->driver)
2081                 module_put(csi2->driver->owner);
2082 exit_free_clk:
2083         pm_runtime_disable(&pdev->dev);
2084         free_irq(pcdev->irq, pcdev);
2085 exit_release_mem:
2086         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
2087                 dma_release_declared_memory(&pdev->dev);
2088 exit_iounmap:
2089         iounmap(base);
2090 exit_kfree:
2091         kfree(pcdev);
2092 exit:
2093         return err;
2094 }
2095
2096 static int __devexit sh_mobile_ceu_remove(struct platform_device *pdev)
2097 {
2098         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
2099         struct sh_mobile_ceu_dev *pcdev = container_of(soc_host,
2100                                         struct sh_mobile_ceu_dev, ici);
2101         struct device *csi2 = pcdev->pdata->csi2_dev;
2102
2103         soc_camera_host_unregister(soc_host);
2104         pm_runtime_disable(&pdev->dev);
2105         free_irq(pcdev->irq, pcdev);
2106         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
2107                 dma_release_declared_memory(&pdev->dev);
2108         iounmap(pcdev->base);
2109         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
2110         if (csi2 && csi2->driver)
2111                 module_put(csi2->driver->owner);
2112         kfree(pcdev);
2113
2114         return 0;
2115 }
2116
2117 static int sh_mobile_ceu_runtime_nop(struct device *dev)
2118 {
2119         /* Runtime PM callback shared between ->runtime_suspend()
2120          * and ->runtime_resume(). Simply returns success.
2121          *
2122          * This driver re-initializes all registers after
2123          * pm_runtime_get_sync() anyway so there is no need
2124          * to save and restore registers here.
2125          */
2126         return 0;
2127 }
2128
2129 static const struct dev_pm_ops sh_mobile_ceu_dev_pm_ops = {
2130         .runtime_suspend = sh_mobile_ceu_runtime_nop,
2131         .runtime_resume = sh_mobile_ceu_runtime_nop,
2132 };
2133
2134 static struct platform_driver sh_mobile_ceu_driver = {
2135         .driver         = {
2136                 .name   = "sh_mobile_ceu",
2137                 .pm     = &sh_mobile_ceu_dev_pm_ops,
2138         },
2139         .probe          = sh_mobile_ceu_probe,
2140         .remove         = __devexit_p(sh_mobile_ceu_remove),
2141 };
2142
2143 static int __init sh_mobile_ceu_init(void)
2144 {
2145         /* Whatever return code */
2146         request_module("sh_mobile_csi2");
2147         return platform_driver_register(&sh_mobile_ceu_driver);
2148 }
2149
2150 static void __exit sh_mobile_ceu_exit(void)
2151 {
2152         platform_driver_unregister(&sh_mobile_ceu_driver);
2153 }
2154
2155 module_init(sh_mobile_ceu_init);
2156 module_exit(sh_mobile_ceu_exit);
2157
2158 MODULE_DESCRIPTION("SuperH Mobile CEU driver");
2159 MODULE_AUTHOR("Magnus Damm");
2160 MODULE_LICENSE("GPL");
2161 MODULE_ALIAS("platform:sh_mobile_ceu");