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/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/sh_mobile_csi2.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         struct platform_device *csi2_pdev;
 100
 101         unsigned int irq;
 102         void __iomem *base;
 103         unsigned long video_limit;
 104
 105         spinlock_t lock;                /* Protects video buffer lists */
 106         struct list_head capture;
 107         struct vb2_buffer *active;
 108         struct vb2_alloc_ctx *alloc_ctx;
 109
 110         struct sh_mobile_ceu_info *pdata;
 111         struct completion complete;
 112
 113         u32 cflcr;
 114
 115         enum v4l2_field field;
 116         int sequence;
 117
 118         unsigned int image_mode:1;
 119         unsigned int is_16bit:1;
 120         unsigned int frozen:1;
 121 };
 122
 123 struct sh_mobile_ceu_cam {
 124         /* CEU offsets within the camera output, before the CEU scaler */
 125         unsigned int ceu_left;
 126         unsigned int ceu_top;
 127         /* Client output, as seen by the CEU */
 128         unsigned int width;
 129         unsigned int height;
 130         /*
 131          * User window from S_CROP / G_CROP, produced by client cropping and
 132          * scaling, CEU scaling and CEU cropping, mapped back onto the client
 133          * input window
 134          */
 135         struct v4l2_rect subrect;
 136         /* Camera cropping rectangle */
 137         struct v4l2_rect rect;
 138         const struct soc_mbus_pixelfmt *extra_fmt;
 139         enum v4l2_mbus_pixelcode code;
 140 };
 141
 142 static struct sh_mobile_ceu_buffer *to_ceu_vb(struct vb2_buffer *vb)
 143 {
 144         return container_of(vb, struct sh_mobile_ceu_buffer, vb);
 145 }
 146
 147 static void ceu_write(struct sh_mobile_ceu_dev *priv,
 148                       unsigned long reg_offs, u32 data)
 149 {
 150         iowrite32(data, priv->base + reg_offs);
 151 }
 152
 153 static u32 ceu_read(struct sh_mobile_ceu_dev *priv, unsigned long reg_offs)
 154 {
 155         return ioread32(priv->base + reg_offs);
 156 }
 157
 158 static int sh_mobile_ceu_soft_reset(struct sh_mobile_ceu_dev *pcdev)
 159 {
 160         int i, success = 0;
 161         struct soc_camera_device *icd = pcdev->icd;
 162
 163         ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
 164
 165         /* wait CSTSR.CPTON bit */
 166         for (i = 0; i < 1000; i++) {
 167                 if (!(ceu_read(pcdev, CSTSR) & 1)) {
 168                         success++;
 169                         break;
 170                 }
 171                 udelay(1);
 172         }
 173
 174         /* wait CAPSR.CPKIL bit */
 175         for (i = 0; i < 1000; i++) {
 176                 if (!(ceu_read(pcdev, CAPSR) & (1 << 16))) {
 177                         success++;
 178                         break;
 179                 }
 180                 udelay(1);
 181         }
 182
 183
 184         if (2 != success) {
 185                 dev_warn(icd->pdev, "soft reset time out\n");
 186                 return -EIO;
 187         }
 188
 189         return 0;
 190 }
 191
 192 /*
 193  *  Videobuf operations
 194  */
 195 static int sh_mobile_ceu_videobuf_setup(struct vb2_queue *vq,
 196                         unsigned int *count, unsigned int *num_planes,
 197                         unsigned int sizes[], void *alloc_ctxs[])
 198 {
 199         struct soc_camera_device *icd = container_of(vq, struct soc_camera_device, vb2_vidq);
 200         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 201         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 202         int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 203                                                 icd->current_fmt->host_fmt);
 204
 205         if (bytes_per_line < 0)
 206                 return bytes_per_line;
 207
 208         *num_planes = 1;
 209
 210         pcdev->sequence = 0;
 211         sizes[0] = bytes_per_line * icd->user_height;
 212         alloc_ctxs[0] = pcdev->alloc_ctx;
 213
 214         if (!*count)
 215                 *count = 2;
 216
 217         if (pcdev->video_limit) {
 218                 if (PAGE_ALIGN(sizes[0]) * *count > pcdev->video_limit)
 219                         *count = pcdev->video_limit / PAGE_ALIGN(sizes[0]);
 220         }
 221
 222         dev_dbg(icd->parent, "count=%d, size=%u\n", *count, sizes[0]);
 223
 224         return 0;
 225 }
 226
 227 #define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */
 228 #define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */
 229 #define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */
 230 #define CEU_CEIER_VBP   (1 << 20) /* vbp error */
 231 #define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */
 232 #define CEU_CEIER_MASK (CEU_CEIER_CPEIE | CEU_CEIER_VBP)
 233
 234
 235 /*
 236  * return value doesn't reflex the success/failure to queue the new buffer,
 237  * but rather the status of the previous buffer.
 238  */
 239 static int sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
 240 {
 241         struct soc_camera_device *icd = pcdev->icd;
 242         dma_addr_t phys_addr_top, phys_addr_bottom;
 243         unsigned long top1, top2;
 244         unsigned long bottom1, bottom2;
 245         u32 status;
 246         bool planar;
 247         int ret = 0;
 248
 249         /*
 250          * The hardware is _very_ picky about this sequence. Especially
 251          * the CEU_CETCR_MAGIC value. It seems like we need to acknowledge
 252          * several not-so-well documented interrupt sources in CETCR.
 253          */
 254         ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_MASK);
 255         status = ceu_read(pcdev, CETCR);
 256         ceu_write(pcdev, CETCR, ~status & CEU_CETCR_MAGIC);
 257         if (!pcdev->frozen)
 258                 ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_MASK);
 259         ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP);
 260         ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW);
 261
 262         /*
 263          * When a VBP interrupt occurs, a capture end interrupt does not occur
 264          * and the image of that frame is not captured correctly. So, soft reset
 265          * is needed here.
 266          */
 267         if (status & CEU_CEIER_VBP) {
 268                 sh_mobile_ceu_soft_reset(pcdev);
 269                 ret = -EIO;
 270         }
 271
 272         if (pcdev->frozen) {
 273                 complete(&pcdev->complete);
 274                 return ret;
 275         }
 276
 277         if (!pcdev->active)
 278                 return ret;
 279
 280         if (V4L2_FIELD_INTERLACED_BT == pcdev->field) {
 281                 top1    = CDBYR;
 282                 top2    = CDBCR;
 283                 bottom1 = CDAYR;
 284                 bottom2 = CDACR;
 285         } else {
 286                 top1    = CDAYR;
 287                 top2    = CDACR;
 288                 bottom1 = CDBYR;
 289                 bottom2 = CDBCR;
 290         }
 291
 292         phys_addr_top = vb2_dma_contig_plane_dma_addr(pcdev->active, 0);
 293
 294         switch (icd->current_fmt->host_fmt->fourcc) {
 295         case V4L2_PIX_FMT_NV12:
 296         case V4L2_PIX_FMT_NV21:
 297         case V4L2_PIX_FMT_NV16:
 298         case V4L2_PIX_FMT_NV61:
 299                 planar = true;
 300                 break;
 301         default:
 302                 planar = false;
 303         }
 304
 305         ceu_write(pcdev, top1, phys_addr_top);
 306         if (V4L2_FIELD_NONE != pcdev->field) {
 307                 if (planar)
 308                         phys_addr_bottom = phys_addr_top + icd->user_width;
 309                 else
 310                         phys_addr_bottom = phys_addr_top +
 311                                 soc_mbus_bytes_per_line(icd->user_width,
 312                                                         icd->current_fmt->host_fmt);
 313                 ceu_write(pcdev, bottom1, phys_addr_bottom);
 314         }
 315
 316         if (planar) {
 317                 phys_addr_top += icd->user_width *
 318                         icd->user_height;
 319                 ceu_write(pcdev, top2, phys_addr_top);
 320                 if (V4L2_FIELD_NONE != pcdev->field) {
 321                         phys_addr_bottom = phys_addr_top + icd->user_width;
 322                         ceu_write(pcdev, bottom2, phys_addr_bottom);
 323                 }
 324         }
 325
 326         ceu_write(pcdev, CAPSR, 0x1); /* start capture */
 327
 328         return ret;
 329 }
 330
 331 static int sh_mobile_ceu_videobuf_prepare(struct vb2_buffer *vb)
 332 {
 333         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
 334         struct sh_mobile_ceu_buffer *buf;
 335         int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 336                                                 icd->current_fmt->host_fmt);
 337         unsigned long size;
 338
 339         if (bytes_per_line < 0)
 340                 return bytes_per_line;
 341
 342         buf = to_ceu_vb(vb);
 343
 344         dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
 345                 vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
 346
 347         /* Added list head initialization on alloc */
 348         WARN(!list_empty(&buf->queue), "Buffer %p on queue!\n", vb);
 349
 350 #ifdef DEBUG
 351         /*
 352          * This can be useful if you want to see if we actually fill
 353          * the buffer with something
 354          */
 355         if (vb2_plane_vaddr(vb, 0))
 356                 memset(vb2_plane_vaddr(vb, 0), 0xaa, vb2_get_plane_payload(vb, 0));
 357 #endif
 358
 359         BUG_ON(NULL == icd->current_fmt);
 360
 361         size = icd->user_height * bytes_per_line;
 362
 363         if (vb2_plane_size(vb, 0) < size) {
 364                 dev_err(icd->parent, "Buffer too small (%lu < %lu)\n",
 365                         vb2_plane_size(vb, 0), size);
 366                 return -ENOBUFS;
 367         }
 368
 369         vb2_set_plane_payload(vb, 0, size);
 370
 371         return 0;
 372 }
 373
 374 static void sh_mobile_ceu_videobuf_queue(struct vb2_buffer *vb)
 375 {
 376         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
 377         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 378         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 379         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb);
 380
 381         dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
 382                 vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
 383
 384         spin_lock_irq(&pcdev->lock);
 385         list_add_tail(&buf->queue, &pcdev->capture);
 386
 387         if (!pcdev->active) {
 388                 /*
 389                  * Because there were no active buffer at this moment,
 390                  * we are not interested in the return value of
 391                  * sh_mobile_ceu_capture here.
 392                  */
 393                 pcdev->active = vb;
 394                 sh_mobile_ceu_capture(pcdev);
 395         }
 396         spin_unlock_irq(&pcdev->lock);
 397 }
 398
 399 static void sh_mobile_ceu_videobuf_release(struct vb2_buffer *vb)
 400 {
 401         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
 402         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 403         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb);
 404         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 405
 406         spin_lock_irq(&pcdev->lock);
 407
 408         if (pcdev->active == vb) {
 409                 /* disable capture (release DMA buffer), reset */
 410                 ceu_write(pcdev, CAPSR, 1 << 16);
 411                 pcdev->active = NULL;
 412         }
 413
 414         /*
 415          * Doesn't hurt also if the list is empty, but it hurts, if queuing the
 416          * buffer failed, and .buf_init() hasn't been called
 417          */
 418         if (buf->queue.next)
 419                 list_del_init(&buf->queue);
 420
 421         spin_unlock_irq(&pcdev->lock);
 422 }
 423
 424 static int sh_mobile_ceu_videobuf_init(struct vb2_buffer *vb)
 425 {
 426         /* This is for locking debugging only */
 427         INIT_LIST_HEAD(&to_ceu_vb(vb)->queue);
 428         return 0;
 429 }
 430
 431 static int sh_mobile_ceu_stop_streaming(struct vb2_queue *q)
 432 {
 433         struct soc_camera_device *icd = container_of(q, struct soc_camera_device, vb2_vidq);
 434         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 435         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 436         struct list_head *buf_head, *tmp;
 437
 438         spin_lock_irq(&pcdev->lock);
 439
 440         pcdev->active = NULL;
 441
 442         list_for_each_safe(buf_head, tmp, &pcdev->capture)
 443                 list_del_init(buf_head);
 444
 445         spin_unlock_irq(&pcdev->lock);
 446
 447         return sh_mobile_ceu_soft_reset(pcdev);
 448 }
 449
 450 static struct vb2_ops sh_mobile_ceu_videobuf_ops = {
 451         .queue_setup    = sh_mobile_ceu_videobuf_setup,
 452         .buf_prepare    = sh_mobile_ceu_videobuf_prepare,
 453         .buf_queue      = sh_mobile_ceu_videobuf_queue,
 454         .buf_cleanup    = sh_mobile_ceu_videobuf_release,
 455         .buf_init       = sh_mobile_ceu_videobuf_init,
 456         .wait_prepare   = soc_camera_unlock,
 457         .wait_finish    = soc_camera_lock,
 458         .stop_streaming = sh_mobile_ceu_stop_streaming,
 459 };
 460
 461 static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
 462 {
 463         struct sh_mobile_ceu_dev *pcdev = data;
 464         struct vb2_buffer *vb;
 465         int ret;
 466
 467         spin_lock(&pcdev->lock);
 468
 469         vb = pcdev->active;
 470         if (!vb)
 471                 /* Stale interrupt from a released buffer */
 472                 goto out;
 473
 474         list_del_init(&to_ceu_vb(vb)->queue);
 475
 476         if (!list_empty(&pcdev->capture))
 477                 pcdev->active = &list_entry(pcdev->capture.next,
 478                                             struct sh_mobile_ceu_buffer, queue)->vb;
 479         else
 480                 pcdev->active = NULL;
 481
 482         ret = sh_mobile_ceu_capture(pcdev);
 483         do_gettimeofday(&vb->v4l2_buf.timestamp);
 484         if (!ret) {
 485                 vb->v4l2_buf.field = pcdev->field;
 486                 vb->v4l2_buf.sequence = pcdev->sequence++;
 487         }
 488         vb2_buffer_done(vb, ret < 0 ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 489
 490 out:
 491         spin_unlock(&pcdev->lock);
 492
 493         return IRQ_HANDLED;
 494 }
 495
 496 static struct v4l2_subdev *find_csi2(struct sh_mobile_ceu_dev *pcdev)
 497 {
 498         struct v4l2_subdev *sd;
 499
 500         if (!pcdev->csi2_pdev)
 501                 return NULL;
 502
 503         v4l2_device_for_each_subdev(sd, &pcdev->ici.v4l2_dev)
 504                 if (&pcdev->csi2_pdev->dev == v4l2_get_subdevdata(sd))
 505                         return sd;
 506
 507         return NULL;
 508 }
 509
 510 /* Called with .video_lock held */
 511 static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
 512 {
 513         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 514         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 515         struct v4l2_subdev *csi2_sd;
 516         int ret;
 517
 518         if (pcdev->icd)
 519                 return -EBUSY;
 520
 521         dev_info(icd->parent,
 522                  "SuperH Mobile CEU driver attached to camera %d\n",
 523                  icd->devnum);
 524
 525         pm_runtime_get_sync(ici->v4l2_dev.dev);
 526
 527         ret = sh_mobile_ceu_soft_reset(pcdev);
 528
 529         csi2_sd = find_csi2(pcdev);
 530
 531         ret = v4l2_subdev_call(csi2_sd, core, s_power, 1);
 532         if (ret != -ENODEV && ret != -ENOIOCTLCMD && ret < 0) {
 533                 pm_runtime_put_sync(ici->v4l2_dev.dev);
 534         } else {
 535                 pcdev->icd = icd;
 536                 ret = 0;
 537         }
 538
 539         return ret;
 540 }
 541
 542 /* Called with .video_lock held */
 543 static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
 544 {
 545         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 546         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 547         struct v4l2_subdev *csi2_sd = find_csi2(pcdev);
 548
 549         BUG_ON(icd != pcdev->icd);
 550
 551         v4l2_subdev_call(csi2_sd, core, s_power, 0);
 552         /* disable capture, disable interrupts */
 553         ceu_write(pcdev, CEIER, 0);
 554         sh_mobile_ceu_soft_reset(pcdev);
 555
 556         /* make sure active buffer is canceled */
 557         spin_lock_irq(&pcdev->lock);
 558         if (pcdev->active) {
 559                 list_del_init(&to_ceu_vb(pcdev->active)->queue);
 560                 vb2_buffer_done(pcdev->active, VB2_BUF_STATE_ERROR);
 561                 pcdev->active = NULL;
 562         }
 563         spin_unlock_irq(&pcdev->lock);
 564
 565         pm_runtime_put_sync(ici->v4l2_dev.dev);
 566
 567         dev_info(icd->parent,
 568                  "SuperH Mobile CEU driver detached from camera %d\n",
 569                  icd->devnum);
 570
 571         pcdev->icd = NULL;
 572 }
 573
 574 /*
 575  * See chapter 29.4.12 "Capture Filter Control Register (CFLCR)"
 576  * in SH7722 Hardware Manual
 577  */
 578 static unsigned int size_dst(unsigned int src, unsigned int scale)
 579 {
 580         unsigned int mant_pre = scale >> 12;
 581         if (!src || !scale)
 582                 return src;
 583         return ((mant_pre + 2 * (src - 1)) / (2 * mant_pre) - 1) *
 584                 mant_pre * 4096 / scale + 1;
 585 }
 586
 587 static u16 calc_scale(unsigned int src, unsigned int *dst)
 588 {
 589         u16 scale;
 590
 591         if (src == *dst)
 592                 return 0;
 593
 594         scale = (src * 4096 / *dst) & ~7;
 595
 596         while (scale > 4096 && size_dst(src, scale) < *dst)
 597                 scale -= 8;
 598
 599         *dst = size_dst(src, scale);
 600
 601         return scale;
 602 }
 603
 604 /* rect is guaranteed to not exceed the scaled camera rectangle */
 605 static void sh_mobile_ceu_set_rect(struct soc_camera_device *icd)
 606 {
 607         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 608         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 609         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 610         unsigned int height, width, cdwdr_width, in_width, in_height;
 611         unsigned int left_offset, top_offset;
 612         u32 camor;
 613
 614         dev_geo(icd->parent, "Crop %ux%u@%u:%u\n",
 615                 icd->user_width, icd->user_height, cam->ceu_left, cam->ceu_top);
 616
 617         left_offset     = cam->ceu_left;
 618         top_offset      = cam->ceu_top;
 619
 620         WARN_ON(icd->user_width & 3 || icd->user_height & 3);
 621
 622         width = icd->user_width;
 623
 624         if (pcdev->image_mode) {
 625                 in_width = cam->width;
 626                 if (!pcdev->is_16bit) {
 627                         in_width *= 2;
 628                         left_offset *= 2;
 629                 }
 630                 cdwdr_width = width;
 631         } else {
 632                 int bytes_per_line = soc_mbus_bytes_per_line(width,
 633                                                 icd->current_fmt->host_fmt);
 634                 unsigned int w_factor;
 635
 636                 switch (icd->current_fmt->host_fmt->packing) {
 637                 case SOC_MBUS_PACKING_2X8_PADHI:
 638                         w_factor = 2;
 639                         break;
 640                 default:
 641                         w_factor = 1;
 642                 }
 643
 644                 in_width = cam->width * w_factor;
 645                 left_offset *= w_factor;
 646
 647                 if (bytes_per_line < 0)
 648                         cdwdr_width = width;
 649                 else
 650                         cdwdr_width = bytes_per_line;
 651         }
 652
 653         height = icd->user_height;
 654         in_height = cam->height;
 655         if (V4L2_FIELD_NONE != pcdev->field) {
 656                 height = (height / 2) & ~3;
 657                 in_height /= 2;
 658                 top_offset /= 2;
 659                 cdwdr_width *= 2;
 660         }
 661
 662         /* CSI2 special configuration */
 663         if (pcdev->pdata->csi2) {
 664                 in_width = ((in_width - 2) * 2);
 665                 left_offset *= 2;
 666         }
 667
 668         /* Set CAMOR, CAPWR, CFSZR, take care of CDWDR */
 669         camor = left_offset | (top_offset << 16);
 670
 671         dev_geo(icd->parent,
 672                 "CAMOR 0x%x, CAPWR 0x%x, CFSZR 0x%x, CDWDR 0x%x\n", camor,
 673                 (in_height << 16) | in_width, (height << 16) | width,
 674                 cdwdr_width);
 675
 676         ceu_write(pcdev, CAMOR, camor);
 677         ceu_write(pcdev, CAPWR, (in_height << 16) | in_width);
 678         /* CFSZR clipping is applied _after_ the scaling filter (CFLCR) */
 679         ceu_write(pcdev, CFSZR, (height << 16) | width);
 680         ceu_write(pcdev, CDWDR, cdwdr_width);
 681 }
 682
 683 static u32 capture_save_reset(struct sh_mobile_ceu_dev *pcdev)
 684 {
 685         u32 capsr = ceu_read(pcdev, CAPSR);
 686         ceu_write(pcdev, CAPSR, 1 << 16); /* reset, stop capture */
 687         return capsr;
 688 }
 689
 690 static void capture_restore(struct sh_mobile_ceu_dev *pcdev, u32 capsr)
 691 {
 692         unsigned long timeout = jiffies + 10 * HZ;
 693
 694         /*
 695          * Wait until the end of the current frame. It can take a long time,
 696          * but if it has been aborted by a CAPSR reset, it shoule exit sooner.
 697          */
 698         while ((ceu_read(pcdev, CSTSR) & 1) && time_before(jiffies, timeout))
 699                 msleep(1);
 700
 701         if (time_after(jiffies, timeout)) {
 702                 dev_err(pcdev->ici.v4l2_dev.dev,
 703                         "Timeout waiting for frame end! Interface problem?\n");
 704                 return;
 705         }
 706
 707         /* Wait until reset clears, this shall not hang... */
 708         while (ceu_read(pcdev, CAPSR) & (1 << 16))
 709                 udelay(10);
 710
 711         /* Anything to restore? */
 712         if (capsr & ~(1 << 16))
 713                 ceu_write(pcdev, CAPSR, capsr);
 714 }
 715
 716 /* Find the bus subdevice driver, e.g., CSI2 */
 717 static struct v4l2_subdev *find_bus_subdev(struct sh_mobile_ceu_dev *pcdev,
 718                                            struct soc_camera_device *icd)
 719 {
 720         if (pcdev->csi2_pdev) {
 721                 struct v4l2_subdev *csi2_sd = find_csi2(pcdev);
 722                 if (csi2_sd && csi2_sd->grp_id == (u32)icd)
 723                         return csi2_sd;
 724         }
 725
 726         return soc_camera_to_subdev(icd);
 727 }
 728
 729 #define CEU_BUS_FLAGS (V4L2_MBUS_MASTER |       \
 730                 V4L2_MBUS_PCLK_SAMPLE_RISING |  \
 731                 V4L2_MBUS_HSYNC_ACTIVE_HIGH |   \
 732                 V4L2_MBUS_HSYNC_ACTIVE_LOW |    \
 733                 V4L2_MBUS_VSYNC_ACTIVE_HIGH |   \
 734                 V4L2_MBUS_VSYNC_ACTIVE_LOW |    \
 735                 V4L2_MBUS_DATA_ACTIVE_HIGH)
 736
 737 /* Capture is not running, no interrupts, no locking needed */
 738 static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
 739                                        __u32 pixfmt)
 740 {
 741         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 742         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 743         struct v4l2_subdev *sd = find_bus_subdev(pcdev, icd);
 744         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 745         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
 746         unsigned long value, common_flags = CEU_BUS_FLAGS;
 747         u32 capsr = capture_save_reset(pcdev);
 748         unsigned int yuv_lineskip;
 749         int ret;
 750
 751         /*
 752          * If the client doesn't implement g_mbus_config, we just use our
 753          * platform data
 754          */
 755         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
 756         if (!ret) {
 757                 common_flags = soc_mbus_config_compatible(&cfg,
 758                                                           common_flags);
 759                 if (!common_flags)
 760                         return -EINVAL;
 761         } else if (ret != -ENOIOCTLCMD) {
 762                 return ret;
 763         }
 764
 765         /* Make choises, based on platform preferences */
 766         if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
 767             (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
 768                 if (pcdev->pdata->flags & SH_CEU_FLAG_HSYNC_LOW)
 769                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
 770                 else
 771                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
 772         }
 773
 774         if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
 775             (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
 776                 if (pcdev->pdata->flags & SH_CEU_FLAG_VSYNC_LOW)
 777                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
 778                 else
 779                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
 780         }
 781
 782         cfg.flags = common_flags;
 783         ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
 784         if (ret < 0 && ret != -ENOIOCTLCMD)
 785                 return ret;
 786
 787         if (icd->current_fmt->host_fmt->bits_per_sample > 8)
 788                 pcdev->is_16bit = 1;
 789         else
 790                 pcdev->is_16bit = 0;
 791
 792         ceu_write(pcdev, CRCNTR, 0);
 793         ceu_write(pcdev, CRCMPR, 0);
 794
 795         value = 0x00000010; /* data fetch by default */
 796         yuv_lineskip = 0x10;
 797
 798         switch (icd->current_fmt->host_fmt->fourcc) {
 799         case V4L2_PIX_FMT_NV12:
 800         case V4L2_PIX_FMT_NV21:
 801                 /* convert 4:2:2 -> 4:2:0 */
 802                 yuv_lineskip = 0; /* skip for NV12/21, no skip for NV16/61 */
 803                 /* fall-through */
 804         case V4L2_PIX_FMT_NV16:
 805         case V4L2_PIX_FMT_NV61:
 806                 switch (cam->code) {
 807                 case V4L2_MBUS_FMT_UYVY8_2X8:
 808                         value = 0x00000000; /* Cb0, Y0, Cr0, Y1 */
 809                         break;
 810                 case V4L2_MBUS_FMT_VYUY8_2X8:
 811                         value = 0x00000100; /* Cr0, Y0, Cb0, Y1 */
 812                         break;
 813                 case V4L2_MBUS_FMT_YUYV8_2X8:
 814                         value = 0x00000200; /* Y0, Cb0, Y1, Cr0 */
 815                         break;
 816                 case V4L2_MBUS_FMT_YVYU8_2X8:
 817                         value = 0x00000300; /* Y0, Cr0, Y1, Cb0 */
 818                         break;
 819                 default:
 820                         BUG();
 821                 }
 822         }
 823
 824         if (icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV21 ||
 825             icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV61)
 826                 value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */
 827
 828         value |= common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
 829         value |= common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
 830         value |= pcdev->is_16bit ? 1 << 12 : 0;
 831
 832         /* CSI2 mode */
 833         if (pcdev->pdata->csi2)
 834                 value |= 3 << 12;
 835
 836         ceu_write(pcdev, CAMCR, value);
 837
 838         ceu_write(pcdev, CAPCR, 0x00300000);
 839
 840         switch (pcdev->field) {
 841         case V4L2_FIELD_INTERLACED_TB:
 842                 value = 0x101;
 843                 break;
 844         case V4L2_FIELD_INTERLACED_BT:
 845                 value = 0x102;
 846                 break;
 847         default:
 848                 value = 0;
 849                 break;
 850         }
 851         ceu_write(pcdev, CAIFR, value);
 852
 853         sh_mobile_ceu_set_rect(icd);
 854         mdelay(1);
 855
 856         dev_geo(icd->parent, "CFLCR 0x%x\n", pcdev->cflcr);
 857         ceu_write(pcdev, CFLCR, pcdev->cflcr);
 858
 859         /*
 860          * A few words about byte order (observed in Big Endian mode)
 861          *
 862          * In data fetch mode bytes are received in chunks of 8 bytes.
 863          * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
 864          *
 865          * The data is however by default written to memory in reverse order:
 866          * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
 867          *
 868          * The lowest three bits of CDOCR allows us to do swapping,
 869          * using 7 we swap the data bytes to match the incoming order:
 870          * D0, D1, D2, D3, D4, D5, D6, D7
 871          */
 872         value = 0x00000007 | yuv_lineskip;
 873
 874         ceu_write(pcdev, CDOCR, value);
 875         ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
 876
 877         dev_dbg(icd->parent, "S_FMT successful for %c%c%c%c %ux%u\n",
 878                 pixfmt & 0xff, (pixfmt >> 8) & 0xff,
 879                 (pixfmt >> 16) & 0xff, (pixfmt >> 24) & 0xff,
 880                 icd->user_width, icd->user_height);
 881
 882         capture_restore(pcdev, capsr);
 883
 884         /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
 885         return 0;
 886 }
 887
 888 static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd,
 889                                        unsigned char buswidth)
 890 {
 891         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 892         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 893         struct v4l2_subdev *sd = find_bus_subdev(pcdev, icd);
 894         unsigned long common_flags = CEU_BUS_FLAGS;
 895         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
 896         int ret;
 897
 898         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
 899         if (!ret)
 900                 common_flags = soc_mbus_config_compatible(&cfg,
 901                                                           common_flags);
 902         else if (ret != -ENOIOCTLCMD)
 903                 return ret;
 904
 905         if (!common_flags || buswidth > 16)
 906                 return -EINVAL;
 907
 908         return 0;
 909 }
 910
 911 static const struct soc_mbus_pixelfmt sh_mobile_ceu_formats[] = {
 912         {
 913                 .fourcc                 = V4L2_PIX_FMT_NV12,
 914                 .name                   = "NV12",
 915                 .bits_per_sample        = 8,
 916                 .packing                = SOC_MBUS_PACKING_1_5X8,
 917                 .order                  = SOC_MBUS_ORDER_LE,
 918         }, {
 919                 .fourcc                 = V4L2_PIX_FMT_NV21,
 920                 .name                   = "NV21",
 921                 .bits_per_sample        = 8,
 922                 .packing                = SOC_MBUS_PACKING_1_5X8,
 923                 .order                  = SOC_MBUS_ORDER_LE,
 924         }, {
 925                 .fourcc                 = V4L2_PIX_FMT_NV16,
 926                 .name                   = "NV16",
 927                 .bits_per_sample        = 8,
 928                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
 929                 .order                  = SOC_MBUS_ORDER_LE,
 930         }, {
 931                 .fourcc                 = V4L2_PIX_FMT_NV61,
 932                 .name                   = "NV61",
 933                 .bits_per_sample        = 8,
 934                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
 935                 .order                  = SOC_MBUS_ORDER_LE,
 936         },
 937 };
 938
 939 /* This will be corrected as we get more formats */
 940 static bool sh_mobile_ceu_packing_supported(const struct soc_mbus_pixelfmt *fmt)
 941 {
 942         return  fmt->packing == SOC_MBUS_PACKING_NONE ||
 943                 (fmt->bits_per_sample == 8 &&
 944                  fmt->packing == SOC_MBUS_PACKING_1_5X8) ||
 945                 (fmt->bits_per_sample == 8 &&
 946                  fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
 947                 (fmt->bits_per_sample > 8 &&
 948                  fmt->packing == SOC_MBUS_PACKING_EXTEND16);
 949 }
 950
 951 static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect);
 952
 953 static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, unsigned int idx,
 954                                      struct soc_camera_format_xlate *xlate)
 955 {
 956         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 957         struct device *dev = icd->parent;
 958         struct soc_camera_host *ici = to_soc_camera_host(dev);
 959         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 960         int ret, k, n;
 961         int formats = 0;
 962         struct sh_mobile_ceu_cam *cam;
 963         enum v4l2_mbus_pixelcode code;
 964         const struct soc_mbus_pixelfmt *fmt;
 965
 966         ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
 967         if (ret < 0)
 968                 /* No more formats */
 969                 return 0;
 970
 971         fmt = soc_mbus_get_fmtdesc(code);
 972         if (!fmt) {
 973                 dev_warn(dev, "unsupported format code #%u: %d\n", idx, code);
 974                 return 0;
 975         }
 976
 977         if (!pcdev->pdata->csi2) {
 978                 /* Are there any restrictions in the CSI-2 case? */
 979                 ret = sh_mobile_ceu_try_bus_param(icd, fmt->bits_per_sample);
 980                 if (ret < 0)
 981                         return 0;
 982         }
 983
 984         if (!icd->host_priv) {
 985                 struct v4l2_mbus_framefmt mf;
 986                 struct v4l2_rect rect;
 987                 int shift = 0;
 988
 989                 /* FIXME: subwindow is lost between close / open */
 990
 991                 /* Cache current client geometry */
 992                 ret = client_g_rect(sd, &rect);
 993                 if (ret < 0)
 994                         return ret;
 995
 996                 /* First time */
 997                 ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
 998                 if (ret < 0)
 999                         return ret;
1000
1001                 while ((mf.width > 2560 || mf.height > 1920) && shift < 4) {
1002                         /* Try 2560x1920, 1280x960, 640x480, 320x240 */
1003                         mf.width        = 2560 >> shift;
1004                         mf.height       = 1920 >> shift;
1005                         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
1006                                                          s_mbus_fmt, &mf);
1007                         if (ret < 0)
1008                                 return ret;
1009                         shift++;
1010                 }
1011
1012                 if (shift == 4) {
1013                         dev_err(dev, "Failed to configure the client below %ux%x\n",
1014                                 mf.width, mf.height);
1015                         return -EIO;
1016                 }
1017
1018                 dev_geo(dev, "camera fmt %ux%u\n", mf.width, mf.height);
1019
1020                 cam = kzalloc(sizeof(*cam), GFP_KERNEL);
1021                 if (!cam)
1022                         return -ENOMEM;
1023
1024                 /* We are called with current camera crop, initialise subrect with it */
1025                 cam->rect       = rect;
1026                 cam->subrect    = rect;
1027
1028                 cam->width      = mf.width;
1029                 cam->height     = mf.height;
1030
1031                 icd->host_priv = cam;
1032         } else {
1033                 cam = icd->host_priv;
1034         }
1035
1036         /* Beginning of a pass */
1037         if (!idx)
1038                 cam->extra_fmt = NULL;
1039
1040         switch (code) {
1041         case V4L2_MBUS_FMT_UYVY8_2X8:
1042         case V4L2_MBUS_FMT_VYUY8_2X8:
1043         case V4L2_MBUS_FMT_YUYV8_2X8:
1044         case V4L2_MBUS_FMT_YVYU8_2X8:
1045                 if (cam->extra_fmt)
1046                         break;
1047
1048                 /*
1049                  * Our case is simple so far: for any of the above four camera
1050                  * formats we add all our four synthesized NV* formats, so,
1051                  * just marking the device with a single flag suffices. If
1052                  * the format generation rules are more complex, you would have
1053                  * to actually hang your already added / counted formats onto
1054                  * the host_priv pointer and check whether the format you're
1055                  * going to add now is already there.
1056                  */
1057                 cam->extra_fmt = sh_mobile_ceu_formats;
1058
1059                 n = ARRAY_SIZE(sh_mobile_ceu_formats);
1060                 formats += n;
1061                 for (k = 0; xlate && k < n; k++) {
1062                         xlate->host_fmt = &sh_mobile_ceu_formats[k];
1063                         xlate->code     = code;
1064                         xlate++;
1065                         dev_dbg(dev, "Providing format %s using code %d\n",
1066                                 sh_mobile_ceu_formats[k].name, code);
1067                 }
1068                 break;
1069         default:
1070                 if (!sh_mobile_ceu_packing_supported(fmt))
1071                         return 0;
1072         }
1073
1074         /* Generic pass-through */
1075         formats++;
1076         if (xlate) {
1077                 xlate->host_fmt = fmt;
1078                 xlate->code     = code;
1079                 xlate++;
1080                 dev_dbg(dev, "Providing format %s in pass-through mode\n",
1081                         fmt->name);
1082         }
1083
1084         return formats;
1085 }
1086
1087 static void sh_mobile_ceu_put_formats(struct soc_camera_device *icd)
1088 {
1089         kfree(icd->host_priv);
1090         icd->host_priv = NULL;
1091 }
1092
1093 /* Check if any dimension of r1 is smaller than respective one of r2 */
1094 static bool is_smaller(struct v4l2_rect *r1, struct v4l2_rect *r2)
1095 {
1096         return r1->width < r2->width || r1->height < r2->height;
1097 }
1098
1099 /* Check if r1 fails to cover r2 */
1100 static bool is_inside(struct v4l2_rect *r1, struct v4l2_rect *r2)
1101 {
1102         return r1->left > r2->left || r1->top > r2->top ||
1103                 r1->left + r1->width < r2->left + r2->width ||
1104                 r1->top + r1->height < r2->top + r2->height;
1105 }
1106
1107 static unsigned int scale_down(unsigned int size, unsigned int scale)
1108 {
1109         return (size * 4096 + scale / 2) / scale;
1110 }
1111
1112 static unsigned int calc_generic_scale(unsigned int input, unsigned int output)
1113 {
1114         return (input * 4096 + output / 2) / output;
1115 }
1116
1117 /* Get and store current client crop */
1118 static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect)
1119 {
1120         struct v4l2_crop crop;
1121         struct v4l2_cropcap cap;
1122         int ret;
1123
1124         crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1125
1126         ret = v4l2_subdev_call(sd, video, g_crop, &crop);
1127         if (!ret) {
1128                 *rect = crop.c;
1129                 return ret;
1130         }
1131
1132         /* Camera driver doesn't support .g_crop(), assume default rectangle */
1133         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1134
1135         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1136         if (!ret)
1137                 *rect = cap.defrect;
1138
1139         return ret;
1140 }
1141
1142 /* Client crop has changed, update our sub-rectangle to remain within the area */
1143 static void update_subrect(struct sh_mobile_ceu_cam *cam)
1144 {
1145         struct v4l2_rect *rect = &cam->rect, *subrect = &cam->subrect;
1146
1147         if (rect->width < subrect->width)
1148                 subrect->width = rect->width;
1149
1150         if (rect->height < subrect->height)
1151                 subrect->height = rect->height;
1152
1153         if (rect->left > subrect->left)
1154                 subrect->left = rect->left;
1155         else if (rect->left + rect->width >
1156                  subrect->left + subrect->width)
1157                 subrect->left = rect->left + rect->width -
1158                         subrect->width;
1159
1160         if (rect->top > subrect->top)
1161                 subrect->top = rect->top;
1162         else if (rect->top + rect->height >
1163                  subrect->top + subrect->height)
1164                 subrect->top = rect->top + rect->height -
1165                         subrect->height;
1166 }
1167
1168 /*
1169  * The common for both scaling and cropping iterative approach is:
1170  * 1. try if the client can produce exactly what requested by the user
1171  * 2. if (1) failed, try to double the client image until we get one big enough
1172  * 3. if (2) failed, try to request the maximum image
1173  */
1174 static int client_s_crop(struct soc_camera_device *icd, struct v4l2_crop *crop,
1175                          struct v4l2_crop *cam_crop)
1176 {
1177         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1178         struct v4l2_rect *rect = &crop->c, *cam_rect = &cam_crop->c;
1179         struct device *dev = sd->v4l2_dev->dev;
1180         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1181         struct v4l2_cropcap cap;
1182         int ret;
1183         unsigned int width, height;
1184
1185         v4l2_subdev_call(sd, video, s_crop, crop);
1186         ret = client_g_rect(sd, cam_rect);
1187         if (ret < 0)
1188                 return ret;
1189
1190         /*
1191          * Now cam_crop contains the current camera input rectangle, and it must
1192          * be within camera cropcap bounds
1193          */
1194         if (!memcmp(rect, cam_rect, sizeof(*rect))) {
1195                 /* Even if camera S_CROP failed, but camera rectangle matches */
1196                 dev_dbg(dev, "Camera S_CROP successful for %dx%d@%d:%d\n",
1197                         rect->width, rect->height, rect->left, rect->top);
1198                 cam->rect = *cam_rect;
1199                 return 0;
1200         }
1201
1202         /* Try to fix cropping, that camera hasn't managed to set */
1203         dev_geo(dev, "Fix camera S_CROP for %dx%d@%d:%d to %dx%d@%d:%d\n",
1204                 cam_rect->width, cam_rect->height,
1205                 cam_rect->left, cam_rect->top,
1206                 rect->width, rect->height, rect->left, rect->top);
1207
1208         /* We need sensor maximum rectangle */
1209         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1210         if (ret < 0)
1211                 return ret;
1212
1213         /* Put user requested rectangle within sensor bounds */
1214         soc_camera_limit_side(&rect->left, &rect->width, cap.bounds.left, 2,
1215                               cap.bounds.width);
1216         soc_camera_limit_side(&rect->top, &rect->height, cap.bounds.top, 4,
1217                               cap.bounds.height);
1218
1219         /*
1220          * Popular special case - some cameras can only handle fixed sizes like
1221          * QVGA, VGA,... Take care to avoid infinite loop.
1222          */
1223         width = max(cam_rect->width, 2);
1224         height = max(cam_rect->height, 2);
1225
1226         /*
1227          * Loop as long as sensor is not covering the requested rectangle and
1228          * is still within its bounds
1229          */
1230         while (!ret && (is_smaller(cam_rect, rect) ||
1231                         is_inside(cam_rect, rect)) &&
1232                (cap.bounds.width > width || cap.bounds.height > height)) {
1233
1234                 width *= 2;
1235                 height *= 2;
1236
1237                 cam_rect->width = width;
1238                 cam_rect->height = height;
1239
1240                 /*
1241                  * We do not know what capabilities the camera has to set up
1242                  * left and top borders. We could try to be smarter in iterating
1243                  * them, e.g., if camera current left is to the right of the
1244                  * target left, set it to the middle point between the current
1245                  * left and minimum left. But that would add too much
1246                  * complexity: we would have to iterate each border separately.
1247                  * Instead we just drop to the left and top bounds.
1248                  */
1249                 if (cam_rect->left > rect->left)
1250                         cam_rect->left = cap.bounds.left;
1251
1252                 if (cam_rect->left + cam_rect->width < rect->left + rect->width)
1253                         cam_rect->width = rect->left + rect->width -
1254                                 cam_rect->left;
1255
1256                 if (cam_rect->top > rect->top)
1257                         cam_rect->top = cap.bounds.top;
1258
1259                 if (cam_rect->top + cam_rect->height < rect->top + rect->height)
1260                         cam_rect->height = rect->top + rect->height -
1261                                 cam_rect->top;
1262
1263                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1264                 ret = client_g_rect(sd, cam_rect);
1265                 dev_geo(dev, "Camera S_CROP %d for %dx%d@%d:%d\n", ret,
1266                         cam_rect->width, cam_rect->height,
1267                         cam_rect->left, cam_rect->top);
1268         }
1269
1270         /* S_CROP must not modify the rectangle */
1271         if (is_smaller(cam_rect, rect) || is_inside(cam_rect, rect)) {
1272                 /*
1273                  * The camera failed to configure a suitable cropping,
1274                  * we cannot use the current rectangle, set to max
1275                  */
1276                 *cam_rect = cap.bounds;
1277                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1278                 ret = client_g_rect(sd, cam_rect);
1279                 dev_geo(dev, "Camera S_CROP %d for max %dx%d@%d:%d\n", ret,
1280                         cam_rect->width, cam_rect->height,
1281                         cam_rect->left, cam_rect->top);
1282         }
1283
1284         if (!ret) {
1285                 cam->rect = *cam_rect;
1286                 update_subrect(cam);
1287         }
1288
1289         return ret;
1290 }
1291
1292 /* Iterative s_mbus_fmt, also updates cached client crop on success */
1293 static int client_s_fmt(struct soc_camera_device *icd,
1294                         struct v4l2_mbus_framefmt *mf, bool ceu_can_scale)
1295 {
1296         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1297         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1298         struct device *dev = icd->parent;
1299         unsigned int width = mf->width, height = mf->height, tmp_w, tmp_h;
1300         unsigned int max_width, max_height;
1301         struct v4l2_cropcap cap;
1302         bool ceu_1to1;
1303         int ret;
1304
1305         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
1306                                          s_mbus_fmt, mf);
1307         if (ret < 0)
1308                 return ret;
1309
1310         dev_geo(dev, "camera scaled to %ux%u\n", mf->width, mf->height);
1311
1312         if (width == mf->width && height == mf->height) {
1313                 /* Perfect! The client has done it all. */
1314                 ceu_1to1 = true;
1315                 goto update_cache;
1316         }
1317
1318         ceu_1to1 = false;
1319         if (!ceu_can_scale)
1320                 goto update_cache;
1321
1322         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1323
1324         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1325         if (ret < 0)
1326                 return ret;
1327
1328         max_width = min(cap.bounds.width, 2560);
1329         max_height = min(cap.bounds.height, 1920);
1330
1331         /* Camera set a format, but geometry is not precise, try to improve */
1332         tmp_w = mf->width;
1333         tmp_h = mf->height;
1334
1335         /* width <= max_width && height <= max_height - guaranteed by try_fmt */
1336         while ((width > tmp_w || height > tmp_h) &&
1337                tmp_w < max_width && tmp_h < max_height) {
1338                 tmp_w = min(2 * tmp_w, max_width);
1339                 tmp_h = min(2 * tmp_h, max_height);
1340                 mf->width = tmp_w;
1341                 mf->height = tmp_h;
1342                 ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
1343                                                  s_mbus_fmt, mf);
1344                 dev_geo(dev, "Camera scaled to %ux%u\n",
1345                         mf->width, mf->height);
1346                 if (ret < 0) {
1347                         /* This shouldn't happen */
1348                         dev_err(dev, "Client failed to set format: %d\n", ret);
1349                         return ret;
1350                 }
1351         }
1352
1353 update_cache:
1354         /* Update cache */
1355         ret = client_g_rect(sd, &cam->rect);
1356         if (ret < 0)
1357                 return ret;
1358
1359         if (ceu_1to1)
1360                 cam->subrect = cam->rect;
1361         else
1362                 update_subrect(cam);
1363
1364         return 0;
1365 }
1366
1367 /**
1368  * @width       - on output: user width, mapped back to input
1369  * @height      - on output: user height, mapped back to input
1370  * @mf          - in- / output camera output window
1371  */
1372 static int client_scale(struct soc_camera_device *icd,
1373                         struct v4l2_mbus_framefmt *mf,
1374                         unsigned int *width, unsigned int *height,
1375                         bool ceu_can_scale)
1376 {
1377         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1378         struct device *dev = icd->parent;
1379         struct v4l2_mbus_framefmt mf_tmp = *mf;
1380         unsigned int scale_h, scale_v;
1381         int ret;
1382
1383         /*
1384          * 5. Apply iterative camera S_FMT for camera user window (also updates
1385          *    client crop cache and the imaginary sub-rectangle).
1386          */
1387         ret = client_s_fmt(icd, &mf_tmp, ceu_can_scale);
1388         if (ret < 0)
1389                 return ret;
1390
1391         dev_geo(dev, "5: camera scaled to %ux%u\n",
1392                 mf_tmp.width, mf_tmp.height);
1393
1394         /* 6. Retrieve camera output window (g_fmt) */
1395
1396         /* unneeded - it is already in "mf_tmp" */
1397
1398         /* 7. Calculate new client scales. */
1399         scale_h = calc_generic_scale(cam->rect.width, mf_tmp.width);
1400         scale_v = calc_generic_scale(cam->rect.height, mf_tmp.height);
1401
1402         mf->width       = mf_tmp.width;
1403         mf->height      = mf_tmp.height;
1404         mf->colorspace  = mf_tmp.colorspace;
1405
1406         /*
1407          * 8. Calculate new CEU crop - apply camera scales to previously
1408          *    updated "effective" crop.
1409          */
1410         *width = scale_down(cam->subrect.width, scale_h);
1411         *height = scale_down(cam->subrect.height, scale_v);
1412
1413         dev_geo(dev, "8: new client sub-window %ux%u\n", *width, *height);
1414
1415         return 0;
1416 }
1417
1418 /*
1419  * CEU can scale and crop, but we don't want to waste bandwidth and kill the
1420  * framerate by always requesting the maximum image from the client. See
1421  * Documentation/video4linux/sh_mobile_ceu_camera.txt for a description of
1422  * scaling and cropping algorithms and for the meaning of referenced here steps.
1423  */
1424 static int sh_mobile_ceu_set_crop(struct soc_camera_device *icd,
1425                                   struct v4l2_crop *a)
1426 {
1427         struct v4l2_rect *rect = &a->c;
1428         struct device *dev = icd->parent;
1429         struct soc_camera_host *ici = to_soc_camera_host(dev);
1430         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1431         struct v4l2_crop cam_crop;
1432         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1433         struct v4l2_rect *cam_rect = &cam_crop.c;
1434         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1435         struct v4l2_mbus_framefmt mf;
1436         unsigned int scale_cam_h, scale_cam_v, scale_ceu_h, scale_ceu_v,
1437                 out_width, out_height;
1438         int interm_width, interm_height;
1439         u32 capsr, cflcr;
1440         int ret;
1441
1442         dev_geo(dev, "S_CROP(%ux%u@%u:%u)\n", rect->width, rect->height,
1443                 rect->left, rect->top);
1444
1445         /* During camera cropping its output window can change too, stop CEU */
1446         capsr = capture_save_reset(pcdev);
1447         dev_dbg(dev, "CAPSR 0x%x, CFLCR 0x%x\n", capsr, pcdev->cflcr);
1448
1449         /*
1450          * 1. - 2. Apply iterative camera S_CROP for new input window, read back
1451          * actual camera rectangle.
1452          */
1453         ret = client_s_crop(icd, a, &cam_crop);
1454         if (ret < 0)
1455                 return ret;
1456
1457         dev_geo(dev, "1-2: camera cropped to %ux%u@%u:%u\n",
1458                 cam_rect->width, cam_rect->height,
1459                 cam_rect->left, cam_rect->top);
1460
1461         /* On success cam_crop contains current camera crop */
1462
1463         /* 3. Retrieve camera output window */
1464         ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
1465         if (ret < 0)
1466                 return ret;
1467
1468         if (mf.width > 2560 || mf.height > 1920)
1469                 return -EINVAL;
1470
1471         /* 4. Calculate camera scales */
1472         scale_cam_h     = calc_generic_scale(cam_rect->width, mf.width);
1473         scale_cam_v     = calc_generic_scale(cam_rect->height, mf.height);
1474
1475         /* Calculate intermediate window */
1476         interm_width    = scale_down(rect->width, scale_cam_h);
1477         interm_height   = scale_down(rect->height, scale_cam_v);
1478
1479         if (interm_width < icd->user_width) {
1480                 u32 new_scale_h;
1481
1482                 new_scale_h = calc_generic_scale(rect->width, icd->user_width);
1483
1484                 mf.width = scale_down(cam_rect->width, new_scale_h);
1485         }
1486
1487         if (interm_height < icd->user_height) {
1488                 u32 new_scale_v;
1489
1490                 new_scale_v = calc_generic_scale(rect->height, icd->user_height);
1491
1492                 mf.height = scale_down(cam_rect->height, new_scale_v);
1493         }
1494
1495         if (interm_width < icd->user_width || interm_height < icd->user_height) {
1496                 ret = v4l2_device_call_until_err(sd->v4l2_dev, (int)icd, video,
1497                                                  s_mbus_fmt, &mf);
1498                 if (ret < 0)
1499                         return ret;
1500
1501                 dev_geo(dev, "New camera output %ux%u\n", mf.width, mf.height);
1502                 scale_cam_h     = calc_generic_scale(cam_rect->width, mf.width);
1503                 scale_cam_v     = calc_generic_scale(cam_rect->height, mf.height);
1504                 interm_width    = scale_down(rect->width, scale_cam_h);
1505                 interm_height   = scale_down(rect->height, scale_cam_v);
1506         }
1507
1508         /* Cache camera output window */
1509         cam->width      = mf.width;
1510         cam->height     = mf.height;
1511
1512         if (pcdev->image_mode) {
1513                 out_width       = min(interm_width, icd->user_width);
1514                 out_height      = min(interm_height, icd->user_height);
1515         } else {
1516                 out_width       = interm_width;
1517                 out_height      = interm_height;
1518         }
1519
1520         /*
1521          * 5. Calculate CEU scales from camera scales from results of (5) and
1522          *    the user window
1523          */
1524         scale_ceu_h     = calc_scale(interm_width, &out_width);
1525         scale_ceu_v     = calc_scale(interm_height, &out_height);
1526
1527         dev_geo(dev, "5: CEU scales %u:%u\n", scale_ceu_h, scale_ceu_v);
1528
1529         /* Apply CEU scales. */
1530         cflcr = scale_ceu_h | (scale_ceu_v << 16);
1531         if (cflcr != pcdev->cflcr) {
1532                 pcdev->cflcr = cflcr;
1533                 ceu_write(pcdev, CFLCR, cflcr);
1534         }
1535
1536         icd->user_width  = out_width & ~3;
1537         icd->user_height = out_height & ~3;
1538         /* Offsets are applied at the CEU scaling filter input */
1539         cam->ceu_left    = scale_down(rect->left - cam_rect->left, scale_cam_h) & ~1;
1540         cam->ceu_top     = scale_down(rect->top - cam_rect->top, scale_cam_v) & ~1;
1541
1542         /* 6. Use CEU cropping to crop to the new window. */
1543         sh_mobile_ceu_set_rect(icd);
1544
1545         cam->subrect = *rect;
1546
1547         dev_geo(dev, "6: CEU cropped to %ux%u@%u:%u\n",
1548                 icd->user_width, icd->user_height,
1549                 cam->ceu_left, cam->ceu_top);
1550
1551         /* Restore capture. The CE bit can be cleared by the hardware */
1552         if (pcdev->active)
1553                 capsr |= 1;
1554         capture_restore(pcdev, capsr);
1555
1556         /* Even if only camera cropping succeeded */
1557         return ret;
1558 }
1559
1560 static int sh_mobile_ceu_get_crop(struct soc_camera_device *icd,
1561                                   struct v4l2_crop *a)
1562 {
1563         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1564
1565         a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1566         a->c = cam->subrect;
1567
1568         return 0;
1569 }
1570
1571 /*
1572  * Calculate real client output window by applying new scales to the current
1573  * client crop. New scales are calculated from the requested output format and
1574  * CEU crop, mapped backed onto the client input (subrect).
1575  */
1576 static void calculate_client_output(struct soc_camera_device *icd,
1577                 const struct v4l2_pix_format *pix, struct v4l2_mbus_framefmt *mf)
1578 {
1579         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1580         struct device *dev = icd->parent;
1581         struct v4l2_rect *cam_subrect = &cam->subrect;
1582         unsigned int scale_v, scale_h;
1583
1584         if (cam_subrect->width == cam->rect.width &&
1585             cam_subrect->height == cam->rect.height) {
1586                 /* No sub-cropping */
1587                 mf->width       = pix->width;
1588                 mf->height      = pix->height;
1589                 return;
1590         }
1591
1592         /* 1.-2. Current camera scales and subwin - cached. */
1593
1594         dev_geo(dev, "2: subwin %ux%u@%u:%u\n",
1595                 cam_subrect->width, cam_subrect->height,
1596                 cam_subrect->left, cam_subrect->top);
1597
1598         /*
1599          * 3. Calculate new combined scales from input sub-window to requested
1600          *    user window.
1601          */
1602
1603         /*
1604          * TODO: CEU cannot scale images larger than VGA to smaller than SubQCIF
1605          * (128x96) or larger than VGA
1606          */
1607         scale_h = calc_generic_scale(cam_subrect->width, pix->width);
1608         scale_v = calc_generic_scale(cam_subrect->height, pix->height);
1609
1610         dev_geo(dev, "3: scales %u:%u\n", scale_h, scale_v);
1611
1612         /*
1613          * 4. Calculate desired client output window by applying combined scales
1614          *    to client (real) input window.
1615          */
1616         mf->width       = scale_down(cam->rect.width, scale_h);
1617         mf->height      = scale_down(cam->rect.height, scale_v);
1618 }
1619
1620 /* Similar to set_crop multistage iterative algorithm */
1621 static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
1622                                  struct v4l2_format *f)
1623 {
1624         struct device *dev = icd->parent;
1625         struct soc_camera_host *ici = to_soc_camera_host(dev);
1626         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1627         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1628         struct v4l2_pix_format *pix = &f->fmt.pix;
1629         struct v4l2_mbus_framefmt mf;
1630         __u32 pixfmt = pix->pixelformat;
1631         const struct soc_camera_format_xlate *xlate;
1632         /* Keep Compiler Happy */
1633         unsigned int ceu_sub_width = 0, ceu_sub_height = 0;
1634         u16 scale_v, scale_h;
1635         int ret;
1636         bool image_mode;
1637         enum v4l2_field field;
1638
1639         switch (pix->field) {
1640         default:
1641                 pix->field = V4L2_FIELD_NONE;
1642                 /* fall-through */
1643         case V4L2_FIELD_INTERLACED_TB:
1644         case V4L2_FIELD_INTERLACED_BT:
1645         case V4L2_FIELD_NONE:
1646                 field = pix->field;
1647                 break;
1648         case V4L2_FIELD_INTERLACED:
1649                 field = V4L2_FIELD_INTERLACED_TB;
1650                 break;
1651         }
1652
1653         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1654         if (!xlate) {
1655                 dev_warn(dev, "Format %x not found\n", pixfmt);
1656                 return -EINVAL;
1657         }
1658
1659         /* 1.-4. Calculate desired client output geometry */
1660         calculate_client_output(icd, pix, &mf);
1661         mf.field        = pix->field;
1662         mf.colorspace   = pix->colorspace;
1663         mf.code         = xlate->code;
1664
1665         switch (pixfmt) {
1666         case V4L2_PIX_FMT_NV12:
1667         case V4L2_PIX_FMT_NV21:
1668         case V4L2_PIX_FMT_NV16:
1669         case V4L2_PIX_FMT_NV61:
1670                 image_mode = true;
1671                 break;
1672         default:
1673                 image_mode = false;
1674         }
1675
1676         dev_info(dev, "S_FMT(pix=0x%x, fld 0x%x, code 0x%x, %ux%u)\n", pixfmt, mf.field, mf.code,
1677                 pix->width, pix->height);
1678
1679         dev_geo(dev, "4: request camera output %ux%u\n", mf.width, mf.height);
1680
1681         /* 5. - 9. */
1682         ret = client_scale(icd, &mf, &ceu_sub_width, &ceu_sub_height,
1683                            image_mode && V4L2_FIELD_NONE == field);
1684
1685         dev_geo(dev, "5-9: client scale return %d\n", ret);
1686
1687         /* Done with the camera. Now see if we can improve the result */
1688
1689         dev_geo(dev, "fmt %ux%u, requested %ux%u\n",
1690                 mf.width, mf.height, pix->width, pix->height);
1691         if (ret < 0)
1692                 return ret;
1693
1694         if (mf.code != xlate->code)
1695                 return -EINVAL;
1696
1697         /* 9. Prepare CEU crop */
1698         cam->width = mf.width;
1699         cam->height = mf.height;
1700
1701         /* 10. Use CEU scaling to scale to the requested user window. */
1702
1703         /* We cannot scale up */
1704         if (pix->width > ceu_sub_width)
1705                 ceu_sub_width = pix->width;
1706
1707         if (pix->height > ceu_sub_height)
1708                 ceu_sub_height = pix->height;
1709
1710         pix->colorspace = mf.colorspace;
1711
1712         if (image_mode) {
1713                 /* Scale pix->{width x height} down to width x height */
1714                 scale_h         = calc_scale(ceu_sub_width, &pix->width);
1715                 scale_v         = calc_scale(ceu_sub_height, &pix->height);
1716         } else {
1717                 pix->width      = ceu_sub_width;
1718                 pix->height     = ceu_sub_height;
1719                 scale_h         = 0;
1720                 scale_v         = 0;
1721         }
1722
1723         pcdev->cflcr = scale_h | (scale_v << 16);
1724
1725         /*
1726          * We have calculated CFLCR, the actual configuration will be performed
1727          * in sh_mobile_ceu_set_bus_param()
1728          */
1729
1730         dev_geo(dev, "10: W: %u : 0x%x = %u, H: %u : 0x%x = %u\n",
1731                 ceu_sub_width, scale_h, pix->width,
1732                 ceu_sub_height, scale_v, pix->height);
1733
1734         cam->code               = xlate->code;
1735         icd->current_fmt        = xlate;
1736
1737         pcdev->field = field;
1738         pcdev->image_mode = image_mode;
1739
1740         /* CFSZR requirement */
1741         pix->width      &= ~3;
1742         pix->height     &= ~3;
1743
1744         return 0;
1745 }
1746
1747 static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
1748                                  struct v4l2_format *f)
1749 {
1750         const struct soc_camera_format_xlate *xlate;
1751         struct v4l2_pix_format *pix = &f->fmt.pix;
1752         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1753         struct v4l2_mbus_framefmt mf;
1754         __u32 pixfmt = pix->pixelformat;
1755         int width, height;
1756         int ret;
1757
1758         dev_geo(icd->parent, "TRY_FMT(pix=0x%x, %ux%u)\n",
1759                  pixfmt, pix->width, pix->height);
1760
1761         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1762         if (!xlate) {
1763                 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
1764                 return -EINVAL;
1765         }
1766
1767         /* FIXME: calculate using depth and bus width */
1768
1769         /* CFSZR requires height and width to be 4-pixel aligned */
1770         v4l_bound_align_image(&pix->width, 2, 2560, 2,
1771                               &pix->height, 4, 1920, 2, 0);
1772
1773         width = pix->width;
1774         height = pix->height;
1775
1776         /* limit to sensor capabilities */
1777         mf.width        = pix->width;
1778         mf.height       = pix->height;
1779         mf.field        = pix->field;
1780         mf.code         = xlate->code;
1781         mf.colorspace   = pix->colorspace;
1782
1783         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video, try_mbus_fmt, &mf);
1784         if (ret < 0)
1785                 return ret;
1786
1787         pix->width      = mf.width;
1788         pix->height     = mf.height;
1789         pix->field      = mf.field;
1790         pix->colorspace = mf.colorspace;
1791
1792         switch (pixfmt) {
1793         case V4L2_PIX_FMT_NV12:
1794         case V4L2_PIX_FMT_NV21:
1795         case V4L2_PIX_FMT_NV16:
1796         case V4L2_PIX_FMT_NV61:
1797                 /* FIXME: check against rect_max after converting soc-camera */
1798                 /* We can scale precisely, need a bigger image from camera */
1799                 if (pix->width < width || pix->height < height) {
1800                         /*
1801                          * We presume, the sensor behaves sanely, i.e., if
1802                          * requested a bigger rectangle, it will not return a
1803                          * smaller one.
1804                          */
1805                         mf.width = 2560;
1806                         mf.height = 1920;
1807                         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
1808                                                          try_mbus_fmt, &mf);
1809                         if (ret < 0) {
1810                                 /* Shouldn't actually happen... */
1811                                 dev_err(icd->parent,
1812                                         "FIXME: client try_fmt() = %d\n", ret);
1813                                 return ret;
1814                         }
1815                 }
1816                 /* We will scale exactly */
1817                 if (mf.width > width)
1818                         pix->width = width;
1819                 if (mf.height > height)
1820                         pix->height = height;
1821         }
1822
1823         pix->width      &= ~3;
1824         pix->height     &= ~3;
1825
1826         dev_geo(icd->parent, "%s(): return %d, fmt 0x%x, %ux%u\n",
1827                 __func__, ret, pix->pixelformat, pix->width, pix->height);
1828
1829         return ret;
1830 }
1831
1832 static int sh_mobile_ceu_set_livecrop(struct soc_camera_device *icd,
1833                                       struct v4l2_crop *a)
1834 {
1835         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1836         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1837         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1838         u32 out_width = icd->user_width, out_height = icd->user_height;
1839         int ret;
1840
1841         /* Freeze queue */
1842         pcdev->frozen = 1;
1843         /* Wait for frame */
1844         ret = wait_for_completion_interruptible(&pcdev->complete);
1845         /* Stop the client */
1846         ret = v4l2_subdev_call(sd, video, s_stream, 0);
1847         if (ret < 0)
1848                 dev_warn(icd->parent,
1849                          "Client failed to stop the stream: %d\n", ret);
1850         else
1851                 /* Do the crop, if it fails, there's nothing more we can do */
1852                 sh_mobile_ceu_set_crop(icd, a);
1853
1854         dev_geo(icd->parent, "Output after crop: %ux%u\n", icd->user_width, icd->user_height);
1855
1856         if (icd->user_width != out_width || icd->user_height != out_height) {
1857                 struct v4l2_format f = {
1858                         .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1859                         .fmt.pix        = {
1860                                 .width          = out_width,
1861                                 .height         = out_height,
1862                                 .pixelformat    = icd->current_fmt->host_fmt->fourcc,
1863                                 .field          = pcdev->field,
1864                                 .colorspace     = icd->colorspace,
1865                         },
1866                 };
1867                 ret = sh_mobile_ceu_set_fmt(icd, &f);
1868                 if (!ret && (out_width != f.fmt.pix.width ||
1869                              out_height != f.fmt.pix.height))
1870                         ret = -EINVAL;
1871                 if (!ret) {
1872                         icd->user_width         = out_width & ~3;
1873                         icd->user_height        = out_height & ~3;
1874                         ret = sh_mobile_ceu_set_bus_param(icd,
1875                                         icd->current_fmt->host_fmt->fourcc);
1876                 }
1877         }
1878
1879         /* Thaw the queue */
1880         pcdev->frozen = 0;
1881         spin_lock_irq(&pcdev->lock);
1882         sh_mobile_ceu_capture(pcdev);
1883         spin_unlock_irq(&pcdev->lock);
1884         /* Start the client */
1885         ret = v4l2_subdev_call(sd, video, s_stream, 1);
1886         return ret;
1887 }
1888
1889 static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
1890 {
1891         struct soc_camera_device *icd = file->private_data;
1892
1893         return vb2_poll(&icd->vb2_vidq, file, pt);
1894 }
1895
1896 static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
1897                                   struct v4l2_capability *cap)
1898 {
1899         strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
1900         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1901         return 0;
1902 }
1903
1904 static int sh_mobile_ceu_init_videobuf(struct vb2_queue *q,
1905                                        struct soc_camera_device *icd)
1906 {
1907         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1908         q->io_modes = VB2_MMAP | VB2_USERPTR;
1909         q->drv_priv = icd;
1910         q->ops = &sh_mobile_ceu_videobuf_ops;
1911         q->mem_ops = &vb2_dma_contig_memops;
1912         q->buf_struct_size = sizeof(struct sh_mobile_ceu_buffer);
1913
1914         return vb2_queue_init(q);
1915 }
1916
1917 static int sh_mobile_ceu_get_ctrl(struct soc_camera_device *icd,
1918                                   struct v4l2_control *ctrl)
1919 {
1920         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1921         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1922         u32 val;
1923
1924         switch (ctrl->id) {
1925         case V4L2_CID_SHARPNESS:
1926                 val = ceu_read(pcdev, CLFCR);
1927                 ctrl->value = val ^ 1;
1928                 return 0;
1929         }
1930         return -ENOIOCTLCMD;
1931 }
1932
1933 static int sh_mobile_ceu_set_ctrl(struct soc_camera_device *icd,
1934                                   struct v4l2_control *ctrl)
1935 {
1936         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1937         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1938
1939         switch (ctrl->id) {
1940         case V4L2_CID_SHARPNESS:
1941                 switch (icd->current_fmt->host_fmt->fourcc) {
1942                 case V4L2_PIX_FMT_NV12:
1943                 case V4L2_PIX_FMT_NV21:
1944                 case V4L2_PIX_FMT_NV16:
1945                 case V4L2_PIX_FMT_NV61:
1946                         ceu_write(pcdev, CLFCR, !ctrl->value);
1947                         return 0;
1948                 }
1949                 return -EINVAL;
1950         }
1951         return -ENOIOCTLCMD;
1952 }
1953
1954 static const struct v4l2_queryctrl sh_mobile_ceu_controls[] = {
1955         {
1956                 .id             = V4L2_CID_SHARPNESS,
1957                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
1958                 .name           = "Low-pass filter",
1959                 .minimum        = 0,
1960                 .maximum        = 1,
1961                 .step           = 1,
1962                 .default_value  = 0,
1963         },
1964 };
1965
1966 static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
1967         .owner          = THIS_MODULE,
1968         .add            = sh_mobile_ceu_add_device,
1969         .remove         = sh_mobile_ceu_remove_device,
1970         .get_formats    = sh_mobile_ceu_get_formats,
1971         .put_formats    = sh_mobile_ceu_put_formats,
1972         .get_crop       = sh_mobile_ceu_get_crop,
1973         .set_crop       = sh_mobile_ceu_set_crop,
1974         .set_livecrop   = sh_mobile_ceu_set_livecrop,
1975         .set_fmt        = sh_mobile_ceu_set_fmt,
1976         .try_fmt        = sh_mobile_ceu_try_fmt,
1977         .set_ctrl       = sh_mobile_ceu_set_ctrl,
1978         .get_ctrl       = sh_mobile_ceu_get_ctrl,
1979         .poll           = sh_mobile_ceu_poll,
1980         .querycap       = sh_mobile_ceu_querycap,
1981         .set_bus_param  = sh_mobile_ceu_set_bus_param,
1982         .init_videobuf2 = sh_mobile_ceu_init_videobuf,
1983         .controls       = sh_mobile_ceu_controls,
1984         .num_controls   = ARRAY_SIZE(sh_mobile_ceu_controls),
1985 };
1986
1987 struct bus_wait {
1988         struct notifier_block   notifier;
1989         struct completion       completion;
1990         struct device           *dev;
1991 };
1992
1993 static int bus_notify(struct notifier_block *nb,
1994                       unsigned long action, void *data)
1995 {
1996         struct device *dev = data;
1997         struct bus_wait *wait = container_of(nb, struct bus_wait, notifier);
1998
1999         if (wait->dev != dev)
2000                 return NOTIFY_DONE;
2001
2002         switch (action) {
2003         case BUS_NOTIFY_UNBOUND_DRIVER:
2004                 /* Protect from module unloading */
2005                 wait_for_completion(&wait->completion);
2006                 return NOTIFY_OK;
2007         }
2008         return NOTIFY_DONE;
2009 }
2010
2011 static int __devinit sh_mobile_ceu_probe(struct platform_device *pdev)
2012 {
2013         struct sh_mobile_ceu_dev *pcdev;
2014         struct resource *res;
2015         void __iomem *base;
2016         unsigned int irq;
2017         int err = 0;
2018         struct bus_wait wait = {
2019                 .completion = COMPLETION_INITIALIZER_ONSTACK(wait.completion),
2020                 .notifier.notifier_call = bus_notify,
2021         };
2022         struct sh_mobile_ceu_companion *csi2;
2023
2024         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2025         irq = platform_get_irq(pdev, 0);
2026         if (!res || (int)irq <= 0) {
2027                 dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
2028                 err = -ENODEV;
2029                 goto exit;
2030         }
2031
2032         pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
2033         if (!pcdev) {
2034                 dev_err(&pdev->dev, "Could not allocate pcdev\n");
2035                 err = -ENOMEM;
2036                 goto exit;
2037         }
2038
2039         INIT_LIST_HEAD(&pcdev->capture);
2040         spin_lock_init(&pcdev->lock);
2041         init_completion(&pcdev->complete);
2042
2043         pcdev->pdata = pdev->dev.platform_data;
2044         if (!pcdev->pdata) {
2045                 err = -EINVAL;
2046                 dev_err(&pdev->dev, "CEU platform data not set.\n");
2047                 goto exit_kfree;
2048         }
2049
2050         base = ioremap_nocache(res->start, resource_size(res));
2051         if (!base) {
2052                 err = -ENXIO;
2053                 dev_err(&pdev->dev, "Unable to ioremap CEU registers.\n");
2054                 goto exit_kfree;
2055         }
2056
2057         pcdev->irq = irq;
2058         pcdev->base = base;
2059         pcdev->video_limit = 0; /* only enabled if second resource exists */
2060
2061         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
2062         if (res) {
2063                 err = dma_declare_coherent_memory(&pdev->dev, res->start,
2064                                                   res->start,
2065                                                   resource_size(res),
2066                                                   DMA_MEMORY_MAP |
2067                                                   DMA_MEMORY_EXCLUSIVE);
2068                 if (!err) {
2069                         dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
2070                         err = -ENXIO;
2071                         goto exit_iounmap;
2072                 }
2073
2074                 pcdev->video_limit = resource_size(res);
2075         }
2076
2077         /* request irq */
2078         err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED,
2079                           dev_name(&pdev->dev), pcdev);
2080         if (err) {
2081                 dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
2082                 goto exit_release_mem;
2083         }
2084
2085         pm_suspend_ignore_children(&pdev->dev, true);
2086         pm_runtime_enable(&pdev->dev);
2087         pm_runtime_resume(&pdev->dev);
2088
2089         pcdev->ici.priv = pcdev;
2090         pcdev->ici.v4l2_dev.dev = &pdev->dev;
2091         pcdev->ici.nr = pdev->id;
2092         pcdev->ici.drv_name = dev_name(&pdev->dev);
2093         pcdev->ici.ops = &sh_mobile_ceu_host_ops;
2094
2095         pcdev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
2096         if (IS_ERR(pcdev->alloc_ctx)) {
2097                 err = PTR_ERR(pcdev->alloc_ctx);
2098                 goto exit_free_clk;
2099         }
2100
2101         err = soc_camera_host_register(&pcdev->ici);
2102         if (err)
2103                 goto exit_free_ctx;
2104
2105         /* CSI2 interfacing */
2106         csi2 = pcdev->pdata->csi2;
2107         if (csi2) {
2108                 struct platform_device *csi2_pdev =
2109                         platform_device_alloc("sh-mobile-csi2", csi2->id);
2110                 struct sh_csi2_pdata *csi2_pdata = csi2->platform_data;
2111
2112                 if (!csi2_pdev) {
2113                         err = -ENOMEM;
2114                         goto exit_host_unregister;
2115                 }
2116
2117                 pcdev->csi2_pdev                = csi2_pdev;
2118
2119                 err = platform_device_add_data(csi2_pdev, csi2_pdata, sizeof(*csi2_pdata));
2120                 if (err < 0)
2121                         goto exit_pdev_put;
2122
2123                 csi2_pdata                      = csi2_pdev->dev.platform_data;
2124                 csi2_pdata->v4l2_dev            = &pcdev->ici.v4l2_dev;
2125
2126                 csi2_pdev->resource             = csi2->resource;
2127                 csi2_pdev->num_resources        = csi2->num_resources;
2128
2129                 err = platform_device_add(csi2_pdev);
2130                 if (err < 0)
2131                         goto exit_pdev_put;
2132
2133                 wait.dev = &csi2_pdev->dev;
2134
2135                 err = bus_register_notifier(&platform_bus_type, &wait.notifier);
2136                 if (err < 0)
2137                         goto exit_pdev_unregister;
2138
2139                 /*
2140                  * From this point the driver module will not unload, until
2141                  * we complete the completion.
2142                  */
2143
2144                 if (!csi2_pdev->dev.driver) {
2145                         complete(&wait.completion);
2146                         /* Either too late, or probing failed */
2147                         bus_unregister_notifier(&platform_bus_type, &wait.notifier);
2148                         err = -ENXIO;
2149                         goto exit_pdev_unregister;
2150                 }
2151
2152                 /*
2153                  * The module is still loaded, in the worst case it is hanging
2154                  * in device release on our completion. So, _now_ dereferencing
2155                  * the "owner" is safe!
2156                  */
2157
2158                 err = try_module_get(csi2_pdev->dev.driver->owner);
2159
2160                 /* Let notifier complete, if it has been locked */
2161                 complete(&wait.completion);
2162                 bus_unregister_notifier(&platform_bus_type, &wait.notifier);
2163                 if (!err) {
2164                         err = -ENODEV;
2165                         goto exit_pdev_unregister;
2166                 }
2167         }
2168
2169         return 0;
2170
2171 exit_pdev_unregister:
2172         platform_device_del(pcdev->csi2_pdev);
2173 exit_pdev_put:
2174         pcdev->csi2_pdev->resource = NULL;
2175         platform_device_put(pcdev->csi2_pdev);
2176 exit_host_unregister:
2177         soc_camera_host_unregister(&pcdev->ici);
2178 exit_free_ctx:
2179         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
2180 exit_free_clk:
2181         pm_runtime_disable(&pdev->dev);
2182         free_irq(pcdev->irq, pcdev);
2183 exit_release_mem:
2184         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
2185                 dma_release_declared_memory(&pdev->dev);
2186 exit_iounmap:
2187         iounmap(base);
2188 exit_kfree:
2189         kfree(pcdev);
2190 exit:
2191         return err;
2192 }
2193
2194 static int __devexit sh_mobile_ceu_remove(struct platform_device *pdev)
2195 {
2196         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
2197         struct sh_mobile_ceu_dev *pcdev = container_of(soc_host,
2198                                         struct sh_mobile_ceu_dev, ici);
2199         struct platform_device *csi2_pdev = pcdev->csi2_pdev;
2200
2201         soc_camera_host_unregister(soc_host);
2202         pm_runtime_disable(&pdev->dev);
2203         free_irq(pcdev->irq, pcdev);
2204         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
2205                 dma_release_declared_memory(&pdev->dev);
2206         iounmap(pcdev->base);
2207         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
2208         if (csi2_pdev && csi2_pdev->dev.driver) {
2209                 struct module *csi2_drv = csi2_pdev->dev.driver->owner;
2210                 platform_device_del(csi2_pdev);
2211                 csi2_pdev->resource = NULL;
2212                 platform_device_put(csi2_pdev);
2213                 module_put(csi2_drv);
2214         }
2215         kfree(pcdev);
2216
2217         return 0;
2218 }
2219
2220 static int sh_mobile_ceu_runtime_nop(struct device *dev)
2221 {
2222         /* Runtime PM callback shared between ->runtime_suspend()
2223          * and ->runtime_resume(). Simply returns success.
2224          *
2225          * This driver re-initializes all registers after
2226          * pm_runtime_get_sync() anyway so there is no need
2227          * to save and restore registers here.
2228          */
2229         return 0;
2230 }
2231
2232 static const struct dev_pm_ops sh_mobile_ceu_dev_pm_ops = {
2233         .runtime_suspend = sh_mobile_ceu_runtime_nop,
2234         .runtime_resume = sh_mobile_ceu_runtime_nop,
2235 };
2236
2237 static struct platform_driver sh_mobile_ceu_driver = {
2238         .driver         = {
2239                 .name   = "sh_mobile_ceu",
2240                 .pm     = &sh_mobile_ceu_dev_pm_ops,
2241         },
2242         .probe          = sh_mobile_ceu_probe,
2243         .remove         = __devexit_p(sh_mobile_ceu_remove),
2244 };
2245
2246 static int __init sh_mobile_ceu_init(void)
2247 {
2248         /* Whatever return code */
2249         request_module("sh_mobile_csi2");
2250         return platform_driver_register(&sh_mobile_ceu_driver);
2251 }
2252
2253 static void __exit sh_mobile_ceu_exit(void)
2254 {
2255         platform_driver_unregister(&sh_mobile_ceu_driver);
2256 }
2257
2258 module_init(sh_mobile_ceu_init);
2259 module_exit(sh_mobile_ceu_exit);
2260
2261 MODULE_DESCRIPTION("SuperH Mobile CEU driver");
2262 MODULE_AUTHOR("Magnus Damm");
2263 MODULE_LICENSE("GPL");
2264 MODULE_VERSION("0.0.6");
2265 MODULE_ALIAS("platform:sh_mobile_ceu");