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                         const struct v4l2_format *fmt,
 197                         unsigned int *count, unsigned int *num_planes,
 198                         unsigned int sizes[], void *alloc_ctxs[])
 199 {
 200         struct soc_camera_device *icd = container_of(vq, struct soc_camera_device, vb2_vidq);
 201         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 202         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 203         int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 204                                                 icd->current_fmt->host_fmt);
 205
 206         if (bytes_per_line < 0)
 207                 return bytes_per_line;
 208
 209         *num_planes = 1;
 210
 211         pcdev->sequence = 0;
 212         sizes[0] = bytes_per_line * icd->user_height;
 213         alloc_ctxs[0] = pcdev->alloc_ctx;
 214
 215         if (!*count)
 216                 *count = 2;
 217
 218         if (pcdev->video_limit) {
 219                 if (PAGE_ALIGN(sizes[0]) * *count > pcdev->video_limit)
 220                         *count = pcdev->video_limit / PAGE_ALIGN(sizes[0]);
 221         }
 222
 223         dev_dbg(icd->parent, "count=%d, size=%u\n", *count, sizes[0]);
 224
 225         return 0;
 226 }
 227
 228 #define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */
 229 #define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */
 230 #define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */
 231 #define CEU_CEIER_VBP   (1 << 20) /* vbp error */
 232 #define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */
 233 #define CEU_CEIER_MASK (CEU_CEIER_CPEIE | CEU_CEIER_VBP)
 234
 235
 236 /*
 237  * return value doesn't reflex the success/failure to queue the new buffer,
 238  * but rather the status of the previous buffer.
 239  */
 240 static int sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
 241 {
 242         struct soc_camera_device *icd = pcdev->icd;
 243         dma_addr_t phys_addr_top, phys_addr_bottom;
 244         unsigned long top1, top2;
 245         unsigned long bottom1, bottom2;
 246         u32 status;
 247         bool planar;
 248         int ret = 0;
 249
 250         /*
 251          * The hardware is _very_ picky about this sequence. Especially
 252          * the CEU_CETCR_MAGIC value. It seems like we need to acknowledge
 253          * several not-so-well documented interrupt sources in CETCR.
 254          */
 255         ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_MASK);
 256         status = ceu_read(pcdev, CETCR);
 257         ceu_write(pcdev, CETCR, ~status & CEU_CETCR_MAGIC);
 258         if (!pcdev->frozen)
 259                 ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_MASK);
 260         ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP);
 261         ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW);
 262
 263         /*
 264          * When a VBP interrupt occurs, a capture end interrupt does not occur
 265          * and the image of that frame is not captured correctly. So, soft reset
 266          * is needed here.
 267          */
 268         if (status & CEU_CEIER_VBP) {
 269                 sh_mobile_ceu_soft_reset(pcdev);
 270                 ret = -EIO;
 271         }
 272
 273         if (pcdev->frozen) {
 274                 complete(&pcdev->complete);
 275                 return ret;
 276         }
 277
 278         if (!pcdev->active)
 279                 return ret;
 280
 281         if (V4L2_FIELD_INTERLACED_BT == pcdev->field) {
 282                 top1    = CDBYR;
 283                 top2    = CDBCR;
 284                 bottom1 = CDAYR;
 285                 bottom2 = CDACR;
 286         } else {
 287                 top1    = CDAYR;
 288                 top2    = CDACR;
 289                 bottom1 = CDBYR;
 290                 bottom2 = CDBCR;
 291         }
 292
 293         phys_addr_top = vb2_dma_contig_plane_dma_addr(pcdev->active, 0);
 294
 295         switch (icd->current_fmt->host_fmt->fourcc) {
 296         case V4L2_PIX_FMT_NV12:
 297         case V4L2_PIX_FMT_NV21:
 298         case V4L2_PIX_FMT_NV16:
 299         case V4L2_PIX_FMT_NV61:
 300                 planar = true;
 301                 break;
 302         default:
 303                 planar = false;
 304         }
 305
 306         ceu_write(pcdev, top1, phys_addr_top);
 307         if (V4L2_FIELD_NONE != pcdev->field) {
 308                 if (planar)
 309                         phys_addr_bottom = phys_addr_top + icd->user_width;
 310                 else
 311                         phys_addr_bottom = phys_addr_top +
 312                                 soc_mbus_bytes_per_line(icd->user_width,
 313                                                         icd->current_fmt->host_fmt);
 314                 ceu_write(pcdev, bottom1, phys_addr_bottom);
 315         }
 316
 317         if (planar) {
 318                 phys_addr_top += icd->user_width *
 319                         icd->user_height;
 320                 ceu_write(pcdev, top2, phys_addr_top);
 321                 if (V4L2_FIELD_NONE != pcdev->field) {
 322                         phys_addr_bottom = phys_addr_top + icd->user_width;
 323                         ceu_write(pcdev, bottom2, phys_addr_bottom);
 324                 }
 325         }
 326
 327         ceu_write(pcdev, CAPSR, 0x1); /* start capture */
 328
 329         return ret;
 330 }
 331
 332 static int sh_mobile_ceu_videobuf_prepare(struct vb2_buffer *vb)
 333 {
 334         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
 335         struct sh_mobile_ceu_buffer *buf;
 336         int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 337                                                 icd->current_fmt->host_fmt);
 338         unsigned long size;
 339
 340         if (bytes_per_line < 0)
 341                 return bytes_per_line;
 342
 343         buf = to_ceu_vb(vb);
 344
 345         dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
 346                 vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
 347
 348         /* Added list head initialization on alloc */
 349         WARN(!list_empty(&buf->queue), "Buffer %p on queue!\n", vb);
 350
 351 #ifdef DEBUG
 352         /*
 353          * This can be useful if you want to see if we actually fill
 354          * the buffer with something
 355          */
 356         if (vb2_plane_vaddr(vb, 0))
 357                 memset(vb2_plane_vaddr(vb, 0), 0xaa, vb2_get_plane_payload(vb, 0));
 358 #endif
 359
 360         BUG_ON(NULL == icd->current_fmt);
 361
 362         size = icd->user_height * bytes_per_line;
 363
 364         if (vb2_plane_size(vb, 0) < size) {
 365                 dev_err(icd->parent, "Buffer too small (%lu < %lu)\n",
 366                         vb2_plane_size(vb, 0), size);
 367                 return -ENOBUFS;
 368         }
 369
 370         vb2_set_plane_payload(vb, 0, size);
 371
 372         return 0;
 373 }
 374
 375 static void sh_mobile_ceu_videobuf_queue(struct vb2_buffer *vb)
 376 {
 377         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
 378         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 379         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 380         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb);
 381
 382         dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
 383                 vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
 384
 385         spin_lock_irq(&pcdev->lock);
 386         list_add_tail(&buf->queue, &pcdev->capture);
 387
 388         if (!pcdev->active) {
 389                 /*
 390                  * Because there were no active buffer at this moment,
 391                  * we are not interested in the return value of
 392                  * sh_mobile_ceu_capture here.
 393                  */
 394                 pcdev->active = vb;
 395                 sh_mobile_ceu_capture(pcdev);
 396         }
 397         spin_unlock_irq(&pcdev->lock);
 398 }
 399
 400 static void sh_mobile_ceu_videobuf_release(struct vb2_buffer *vb)
 401 {
 402         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
 403         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 404         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb);
 405         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 406
 407         spin_lock_irq(&pcdev->lock);
 408
 409         if (pcdev->active == vb) {
 410                 /* disable capture (release DMA buffer), reset */
 411                 ceu_write(pcdev, CAPSR, 1 << 16);
 412                 pcdev->active = NULL;
 413         }
 414
 415         /*
 416          * Doesn't hurt also if the list is empty, but it hurts, if queuing the
 417          * buffer failed, and .buf_init() hasn't been called
 418          */
 419         if (buf->queue.next)
 420                 list_del_init(&buf->queue);
 421
 422         spin_unlock_irq(&pcdev->lock);
 423 }
 424
 425 static int sh_mobile_ceu_videobuf_init(struct vb2_buffer *vb)
 426 {
 427         /* This is for locking debugging only */
 428         INIT_LIST_HEAD(&to_ceu_vb(vb)->queue);
 429         return 0;
 430 }
 431
 432 static int sh_mobile_ceu_stop_streaming(struct vb2_queue *q)
 433 {
 434         struct soc_camera_device *icd = container_of(q, struct soc_camera_device, vb2_vidq);
 435         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 436         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 437         struct list_head *buf_head, *tmp;
 438
 439         spin_lock_irq(&pcdev->lock);
 440
 441         pcdev->active = NULL;
 442
 443         list_for_each_safe(buf_head, tmp, &pcdev->capture)
 444                 list_del_init(buf_head);
 445
 446         spin_unlock_irq(&pcdev->lock);
 447
 448         return sh_mobile_ceu_soft_reset(pcdev);
 449 }
 450
 451 static struct vb2_ops sh_mobile_ceu_videobuf_ops = {
 452         .queue_setup    = sh_mobile_ceu_videobuf_setup,
 453         .buf_prepare    = sh_mobile_ceu_videobuf_prepare,
 454         .buf_queue      = sh_mobile_ceu_videobuf_queue,
 455         .buf_cleanup    = sh_mobile_ceu_videobuf_release,
 456         .buf_init       = sh_mobile_ceu_videobuf_init,
 457         .wait_prepare   = soc_camera_unlock,
 458         .wait_finish    = soc_camera_lock,
 459         .stop_streaming = sh_mobile_ceu_stop_streaming,
 460 };
 461
 462 static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
 463 {
 464         struct sh_mobile_ceu_dev *pcdev = data;
 465         struct vb2_buffer *vb;
 466         int ret;
 467
 468         spin_lock(&pcdev->lock);
 469
 470         vb = pcdev->active;
 471         if (!vb)
 472                 /* Stale interrupt from a released buffer */
 473                 goto out;
 474
 475         list_del_init(&to_ceu_vb(vb)->queue);
 476
 477         if (!list_empty(&pcdev->capture))
 478                 pcdev->active = &list_entry(pcdev->capture.next,
 479                                             struct sh_mobile_ceu_buffer, queue)->vb;
 480         else
 481                 pcdev->active = NULL;
 482
 483         ret = sh_mobile_ceu_capture(pcdev);
 484         do_gettimeofday(&vb->v4l2_buf.timestamp);
 485         if (!ret) {
 486                 vb->v4l2_buf.field = pcdev->field;
 487                 vb->v4l2_buf.sequence = pcdev->sequence++;
 488         }
 489         vb2_buffer_done(vb, ret < 0 ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 490
 491 out:
 492         spin_unlock(&pcdev->lock);
 493
 494         return IRQ_HANDLED;
 495 }
 496
 497 static struct v4l2_subdev *find_csi2(struct sh_mobile_ceu_dev *pcdev)
 498 {
 499         struct v4l2_subdev *sd;
 500
 501         if (!pcdev->csi2_pdev)
 502                 return NULL;
 503
 504         v4l2_device_for_each_subdev(sd, &pcdev->ici.v4l2_dev)
 505                 if (&pcdev->csi2_pdev->dev == v4l2_get_subdevdata(sd))
 506                         return sd;
 507
 508         return NULL;
 509 }
 510
 511 /* Called with .video_lock held */
 512 static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
 513 {
 514         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 515         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 516         struct v4l2_subdev *csi2_sd;
 517         int ret;
 518
 519         if (pcdev->icd)
 520                 return -EBUSY;
 521
 522         dev_info(icd->parent,
 523                  "SuperH Mobile CEU driver attached to camera %d\n",
 524                  icd->devnum);
 525
 526         pm_runtime_get_sync(ici->v4l2_dev.dev);
 527
 528         ret = sh_mobile_ceu_soft_reset(pcdev);
 529
 530         csi2_sd = find_csi2(pcdev);
 531
 532         ret = v4l2_subdev_call(csi2_sd, core, s_power, 1);
 533         if (ret != -ENODEV && ret != -ENOIOCTLCMD && ret < 0) {
 534                 pm_runtime_put_sync(ici->v4l2_dev.dev);
 535         } else {
 536                 pcdev->icd = icd;
 537                 ret = 0;
 538         }
 539
 540         return ret;
 541 }
 542
 543 /* Called with .video_lock held */
 544 static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
 545 {
 546         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 547         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 548         struct v4l2_subdev *csi2_sd = find_csi2(pcdev);
 549
 550         BUG_ON(icd != pcdev->icd);
 551
 552         v4l2_subdev_call(csi2_sd, core, s_power, 0);
 553         /* disable capture, disable interrupts */
 554         ceu_write(pcdev, CEIER, 0);
 555         sh_mobile_ceu_soft_reset(pcdev);
 556
 557         /* make sure active buffer is canceled */
 558         spin_lock_irq(&pcdev->lock);
 559         if (pcdev->active) {
 560                 list_del_init(&to_ceu_vb(pcdev->active)->queue);
 561                 vb2_buffer_done(pcdev->active, VB2_BUF_STATE_ERROR);
 562                 pcdev->active = NULL;
 563         }
 564         spin_unlock_irq(&pcdev->lock);
 565
 566         pm_runtime_put_sync(ici->v4l2_dev.dev);
 567
 568         dev_info(icd->parent,
 569                  "SuperH Mobile CEU driver detached from camera %d\n",
 570                  icd->devnum);
 571
 572         pcdev->icd = NULL;
 573 }
 574
 575 /*
 576  * See chapter 29.4.12 "Capture Filter Control Register (CFLCR)"
 577  * in SH7722 Hardware Manual
 578  */
 579 static unsigned int size_dst(unsigned int src, unsigned int scale)
 580 {
 581         unsigned int mant_pre = scale >> 12;
 582         if (!src || !scale)
 583                 return src;
 584         return ((mant_pre + 2 * (src - 1)) / (2 * mant_pre) - 1) *
 585                 mant_pre * 4096 / scale + 1;
 586 }
 587
 588 static u16 calc_scale(unsigned int src, unsigned int *dst)
 589 {
 590         u16 scale;
 591
 592         if (src == *dst)
 593                 return 0;
 594
 595         scale = (src * 4096 / *dst) & ~7;
 596
 597         while (scale > 4096 && size_dst(src, scale) < *dst)
 598                 scale -= 8;
 599
 600         *dst = size_dst(src, scale);
 601
 602         return scale;
 603 }
 604
 605 /* rect is guaranteed to not exceed the scaled camera rectangle */
 606 static void sh_mobile_ceu_set_rect(struct soc_camera_device *icd)
 607 {
 608         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 609         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 610         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 611         unsigned int height, width, cdwdr_width, in_width, in_height;
 612         unsigned int left_offset, top_offset;
 613         u32 camor;
 614
 615         dev_geo(icd->parent, "Crop %ux%u@%u:%u\n",
 616                 icd->user_width, icd->user_height, cam->ceu_left, cam->ceu_top);
 617
 618         left_offset     = cam->ceu_left;
 619         top_offset      = cam->ceu_top;
 620
 621         WARN_ON(icd->user_width & 3 || icd->user_height & 3);
 622
 623         width = icd->user_width;
 624
 625         if (pcdev->image_mode) {
 626                 in_width = cam->width;
 627                 if (!pcdev->is_16bit) {
 628                         in_width *= 2;
 629                         left_offset *= 2;
 630                 }
 631                 cdwdr_width = width;
 632         } else {
 633                 int bytes_per_line = soc_mbus_bytes_per_line(width,
 634                                                 icd->current_fmt->host_fmt);
 635                 unsigned int w_factor;
 636
 637                 switch (icd->current_fmt->host_fmt->packing) {
 638                 case SOC_MBUS_PACKING_2X8_PADHI:
 639                         w_factor = 2;
 640                         break;
 641                 default:
 642                         w_factor = 1;
 643                 }
 644
 645                 in_width = cam->width * w_factor;
 646                 left_offset *= w_factor;
 647
 648                 if (bytes_per_line < 0)
 649                         cdwdr_width = width;
 650                 else
 651                         cdwdr_width = bytes_per_line;
 652         }
 653
 654         height = icd->user_height;
 655         in_height = cam->height;
 656         if (V4L2_FIELD_NONE != pcdev->field) {
 657                 height = (height / 2) & ~3;
 658                 in_height /= 2;
 659                 top_offset /= 2;
 660                 cdwdr_width *= 2;
 661         }
 662
 663         /* CSI2 special configuration */
 664         if (pcdev->pdata->csi2) {
 665                 in_width = ((in_width - 2) * 2);
 666                 left_offset *= 2;
 667         }
 668
 669         /* Set CAMOR, CAPWR, CFSZR, take care of CDWDR */
 670         camor = left_offset | (top_offset << 16);
 671
 672         dev_geo(icd->parent,
 673                 "CAMOR 0x%x, CAPWR 0x%x, CFSZR 0x%x, CDWDR 0x%x\n", camor,
 674                 (in_height << 16) | in_width, (height << 16) | width,
 675                 cdwdr_width);
 676
 677         ceu_write(pcdev, CAMOR, camor);
 678         ceu_write(pcdev, CAPWR, (in_height << 16) | in_width);
 679         /* CFSZR clipping is applied _after_ the scaling filter (CFLCR) */
 680         ceu_write(pcdev, CFSZR, (height << 16) | width);
 681         ceu_write(pcdev, CDWDR, cdwdr_width);
 682 }
 683
 684 static u32 capture_save_reset(struct sh_mobile_ceu_dev *pcdev)
 685 {
 686         u32 capsr = ceu_read(pcdev, CAPSR);
 687         ceu_write(pcdev, CAPSR, 1 << 16); /* reset, stop capture */
 688         return capsr;
 689 }
 690
 691 static void capture_restore(struct sh_mobile_ceu_dev *pcdev, u32 capsr)
 692 {
 693         unsigned long timeout = jiffies + 10 * HZ;
 694
 695         /*
 696          * Wait until the end of the current frame. It can take a long time,
 697          * but if it has been aborted by a CAPSR reset, it shoule exit sooner.
 698          */
 699         while ((ceu_read(pcdev, CSTSR) & 1) && time_before(jiffies, timeout))
 700                 msleep(1);
 701
 702         if (time_after(jiffies, timeout)) {
 703                 dev_err(pcdev->ici.v4l2_dev.dev,
 704                         "Timeout waiting for frame end! Interface problem?\n");
 705                 return;
 706         }
 707
 708         /* Wait until reset clears, this shall not hang... */
 709         while (ceu_read(pcdev, CAPSR) & (1 << 16))
 710                 udelay(10);
 711
 712         /* Anything to restore? */
 713         if (capsr & ~(1 << 16))
 714                 ceu_write(pcdev, CAPSR, capsr);
 715 }
 716
 717 /* Find the bus subdevice driver, e.g., CSI2 */
 718 static struct v4l2_subdev *find_bus_subdev(struct sh_mobile_ceu_dev *pcdev,
 719                                            struct soc_camera_device *icd)
 720 {
 721         if (pcdev->csi2_pdev) {
 722                 struct v4l2_subdev *csi2_sd = find_csi2(pcdev);
 723                 if (csi2_sd && csi2_sd->grp_id == (u32)icd)
 724                         return csi2_sd;
 725         }
 726
 727         return soc_camera_to_subdev(icd);
 728 }
 729
 730 #define CEU_BUS_FLAGS (V4L2_MBUS_MASTER |       \
 731                 V4L2_MBUS_PCLK_SAMPLE_RISING |  \
 732                 V4L2_MBUS_HSYNC_ACTIVE_HIGH |   \
 733                 V4L2_MBUS_HSYNC_ACTIVE_LOW |    \
 734                 V4L2_MBUS_VSYNC_ACTIVE_HIGH |   \
 735                 V4L2_MBUS_VSYNC_ACTIVE_LOW |    \
 736                 V4L2_MBUS_DATA_ACTIVE_HIGH)
 737
 738 /* Capture is not running, no interrupts, no locking needed */
 739 static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
 740                                        __u32 pixfmt)
 741 {
 742         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 743         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 744         struct v4l2_subdev *sd = find_bus_subdev(pcdev, icd);
 745         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 746         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
 747         unsigned long value, common_flags = CEU_BUS_FLAGS;
 748         u32 capsr = capture_save_reset(pcdev);
 749         unsigned int yuv_lineskip;
 750         int ret;
 751
 752         /*
 753          * If the client doesn't implement g_mbus_config, we just use our
 754          * platform data
 755          */
 756         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
 757         if (!ret) {
 758                 common_flags = soc_mbus_config_compatible(&cfg,
 759                                                           common_flags);
 760                 if (!common_flags)
 761                         return -EINVAL;
 762         } else if (ret != -ENOIOCTLCMD) {
 763                 return ret;
 764         }
 765
 766         /* Make choises, based on platform preferences */
 767         if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
 768             (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
 769                 if (pcdev->pdata->flags & SH_CEU_FLAG_HSYNC_LOW)
 770                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
 771                 else
 772                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
 773         }
 774
 775         if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
 776             (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
 777                 if (pcdev->pdata->flags & SH_CEU_FLAG_VSYNC_LOW)
 778                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
 779                 else
 780                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
 781         }
 782
 783         cfg.flags = common_flags;
 784         ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
 785         if (ret < 0 && ret != -ENOIOCTLCMD)
 786                 return ret;
 787
 788         if (icd->current_fmt->host_fmt->bits_per_sample > 8)
 789                 pcdev->is_16bit = 1;
 790         else
 791                 pcdev->is_16bit = 0;
 792
 793         ceu_write(pcdev, CRCNTR, 0);
 794         ceu_write(pcdev, CRCMPR, 0);
 795
 796         value = 0x00000010; /* data fetch by default */
 797         yuv_lineskip = 0x10;
 798
 799         switch (icd->current_fmt->host_fmt->fourcc) {
 800         case V4L2_PIX_FMT_NV12:
 801         case V4L2_PIX_FMT_NV21:
 802                 /* convert 4:2:2 -> 4:2:0 */
 803                 yuv_lineskip = 0; /* skip for NV12/21, no skip for NV16/61 */
 804                 /* fall-through */
 805         case V4L2_PIX_FMT_NV16:
 806         case V4L2_PIX_FMT_NV61:
 807                 switch (cam->code) {
 808                 case V4L2_MBUS_FMT_UYVY8_2X8:
 809                         value = 0x00000000; /* Cb0, Y0, Cr0, Y1 */
 810                         break;
 811                 case V4L2_MBUS_FMT_VYUY8_2X8:
 812                         value = 0x00000100; /* Cr0, Y0, Cb0, Y1 */
 813                         break;
 814                 case V4L2_MBUS_FMT_YUYV8_2X8:
 815                         value = 0x00000200; /* Y0, Cb0, Y1, Cr0 */
 816                         break;
 817                 case V4L2_MBUS_FMT_YVYU8_2X8:
 818                         value = 0x00000300; /* Y0, Cr0, Y1, Cb0 */
 819                         break;
 820                 default:
 821                         BUG();
 822                 }
 823         }
 824
 825         if (icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV21 ||
 826             icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV61)
 827                 value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */
 828
 829         value |= common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
 830         value |= common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
 831         value |= pcdev->is_16bit ? 1 << 12 : 0;
 832
 833         /* CSI2 mode */
 834         if (pcdev->pdata->csi2)
 835                 value |= 3 << 12;
 836
 837         ceu_write(pcdev, CAMCR, value);
 838
 839         ceu_write(pcdev, CAPCR, 0x00300000);
 840
 841         switch (pcdev->field) {
 842         case V4L2_FIELD_INTERLACED_TB:
 843                 value = 0x101;
 844                 break;
 845         case V4L2_FIELD_INTERLACED_BT:
 846                 value = 0x102;
 847                 break;
 848         default:
 849                 value = 0;
 850                 break;
 851         }
 852         ceu_write(pcdev, CAIFR, value);
 853
 854         sh_mobile_ceu_set_rect(icd);
 855         mdelay(1);
 856
 857         dev_geo(icd->parent, "CFLCR 0x%x\n", pcdev->cflcr);
 858         ceu_write(pcdev, CFLCR, pcdev->cflcr);
 859
 860         /*
 861          * A few words about byte order (observed in Big Endian mode)
 862          *
 863          * In data fetch mode bytes are received in chunks of 8 bytes.
 864          * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
 865          *
 866          * The data is however by default written to memory in reverse order:
 867          * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
 868          *
 869          * The lowest three bits of CDOCR allows us to do swapping,
 870          * using 7 we swap the data bytes to match the incoming order:
 871          * D0, D1, D2, D3, D4, D5, D6, D7
 872          */
 873         value = 0x00000007 | yuv_lineskip;
 874
 875         ceu_write(pcdev, CDOCR, value);
 876         ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
 877
 878         dev_dbg(icd->parent, "S_FMT successful for %c%c%c%c %ux%u\n",
 879                 pixfmt & 0xff, (pixfmt >> 8) & 0xff,
 880                 (pixfmt >> 16) & 0xff, (pixfmt >> 24) & 0xff,
 881                 icd->user_width, icd->user_height);
 882
 883         capture_restore(pcdev, capsr);
 884
 885         /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
 886         return 0;
 887 }
 888
 889 static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd,
 890                                        unsigned char buswidth)
 891 {
 892         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 893         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 894         struct v4l2_subdev *sd = find_bus_subdev(pcdev, icd);
 895         unsigned long common_flags = CEU_BUS_FLAGS;
 896         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
 897         int ret;
 898
 899         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
 900         if (!ret)
 901                 common_flags = soc_mbus_config_compatible(&cfg,
 902                                                           common_flags);
 903         else if (ret != -ENOIOCTLCMD)
 904                 return ret;
 905
 906         if (!common_flags || buswidth > 16)
 907                 return -EINVAL;
 908
 909         return 0;
 910 }
 911
 912 static const struct soc_mbus_pixelfmt sh_mobile_ceu_formats[] = {
 913         {
 914                 .fourcc                 = V4L2_PIX_FMT_NV12,
 915                 .name                   = "NV12",
 916                 .bits_per_sample        = 8,
 917                 .packing                = SOC_MBUS_PACKING_1_5X8,
 918                 .order                  = SOC_MBUS_ORDER_LE,
 919         }, {
 920                 .fourcc                 = V4L2_PIX_FMT_NV21,
 921                 .name                   = "NV21",
 922                 .bits_per_sample        = 8,
 923                 .packing                = SOC_MBUS_PACKING_1_5X8,
 924                 .order                  = SOC_MBUS_ORDER_LE,
 925         }, {
 926                 .fourcc                 = V4L2_PIX_FMT_NV16,
 927                 .name                   = "NV16",
 928                 .bits_per_sample        = 8,
 929                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
 930                 .order                  = SOC_MBUS_ORDER_LE,
 931         }, {
 932                 .fourcc                 = V4L2_PIX_FMT_NV61,
 933                 .name                   = "NV61",
 934                 .bits_per_sample        = 8,
 935                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
 936                 .order                  = SOC_MBUS_ORDER_LE,
 937         },
 938 };
 939
 940 /* This will be corrected as we get more formats */
 941 static bool sh_mobile_ceu_packing_supported(const struct soc_mbus_pixelfmt *fmt)
 942 {
 943         return  fmt->packing == SOC_MBUS_PACKING_NONE ||
 944                 (fmt->bits_per_sample == 8 &&
 945                  fmt->packing == SOC_MBUS_PACKING_1_5X8) ||
 946                 (fmt->bits_per_sample == 8 &&
 947                  fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
 948                 (fmt->bits_per_sample > 8 &&
 949                  fmt->packing == SOC_MBUS_PACKING_EXTEND16);
 950 }
 951
 952 static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect);
 953
 954 static struct soc_camera_device *ctrl_to_icd(struct v4l2_ctrl *ctrl)
 955 {
 956         return container_of(ctrl->handler, struct soc_camera_device,
 957                                                         ctrl_handler);
 958 }
 959
 960 static int sh_mobile_ceu_s_ctrl(struct v4l2_ctrl *ctrl)
 961 {
 962         struct soc_camera_device *icd = ctrl_to_icd(ctrl);
 963         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 964         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 965
 966         switch (ctrl->id) {
 967         case V4L2_CID_SHARPNESS:
 968                 switch (icd->current_fmt->host_fmt->fourcc) {
 969                 case V4L2_PIX_FMT_NV12:
 970                 case V4L2_PIX_FMT_NV21:
 971                 case V4L2_PIX_FMT_NV16:
 972                 case V4L2_PIX_FMT_NV61:
 973                         ceu_write(pcdev, CLFCR, !ctrl->val);
 974                         return 0;
 975                 }
 976                 break;
 977         }
 978
 979         return -EINVAL;
 980 }
 981
 982 static const struct v4l2_ctrl_ops sh_mobile_ceu_ctrl_ops = {
 983         .s_ctrl = sh_mobile_ceu_s_ctrl,
 984 };
 985
 986 static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, unsigned int idx,
 987                                      struct soc_camera_format_xlate *xlate)
 988 {
 989         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 990         struct device *dev = icd->parent;
 991         struct soc_camera_host *ici = to_soc_camera_host(dev);
 992         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 993         int ret, k, n;
 994         int formats = 0;
 995         struct sh_mobile_ceu_cam *cam;
 996         enum v4l2_mbus_pixelcode code;
 997         const struct soc_mbus_pixelfmt *fmt;
 998
 999         ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
1000         if (ret < 0)
1001                 /* No more formats */
1002                 return 0;
1003
1004         fmt = soc_mbus_get_fmtdesc(code);
1005         if (!fmt) {
1006                 dev_warn(dev, "unsupported format code #%u: %d\n", idx, code);
1007                 return 0;
1008         }
1009
1010         if (!pcdev->pdata->csi2) {
1011                 /* Are there any restrictions in the CSI-2 case? */
1012                 ret = sh_mobile_ceu_try_bus_param(icd, fmt->bits_per_sample);
1013                 if (ret < 0)
1014                         return 0;
1015         }
1016
1017         if (!icd->host_priv) {
1018                 struct v4l2_mbus_framefmt mf;
1019                 struct v4l2_rect rect;
1020                 int shift = 0;
1021
1022                 /* Add our control */
1023                 v4l2_ctrl_new_std(&icd->ctrl_handler, &sh_mobile_ceu_ctrl_ops,
1024                                   V4L2_CID_SHARPNESS, 0, 1, 1, 0);
1025                 if (icd->ctrl_handler.error)
1026                         return icd->ctrl_handler.error;
1027
1028                 /* FIXME: subwindow is lost between close / open */
1029
1030                 /* Cache current client geometry */
1031                 ret = client_g_rect(sd, &rect);
1032                 if (ret < 0)
1033                         return ret;
1034
1035                 /* First time */
1036                 ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
1037                 if (ret < 0)
1038                         return ret;
1039
1040                 while ((mf.width > 2560 || mf.height > 1920) && shift < 4) {
1041                         /* Try 2560x1920, 1280x960, 640x480, 320x240 */
1042                         mf.width        = 2560 >> shift;
1043                         mf.height       = 1920 >> shift;
1044                         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
1045                                                          s_mbus_fmt, &mf);
1046                         if (ret < 0)
1047                                 return ret;
1048                         shift++;
1049                 }
1050
1051                 if (shift == 4) {
1052                         dev_err(dev, "Failed to configure the client below %ux%x\n",
1053                                 mf.width, mf.height);
1054                         return -EIO;
1055                 }
1056
1057                 dev_geo(dev, "camera fmt %ux%u\n", mf.width, mf.height);
1058
1059                 cam = kzalloc(sizeof(*cam), GFP_KERNEL);
1060                 if (!cam)
1061                         return -ENOMEM;
1062
1063                 /* We are called with current camera crop, initialise subrect with it */
1064                 cam->rect       = rect;
1065                 cam->subrect    = rect;
1066
1067                 cam->width      = mf.width;
1068                 cam->height     = mf.height;
1069
1070                 icd->host_priv = cam;
1071         } else {
1072                 cam = icd->host_priv;
1073         }
1074
1075         /* Beginning of a pass */
1076         if (!idx)
1077                 cam->extra_fmt = NULL;
1078
1079         switch (code) {
1080         case V4L2_MBUS_FMT_UYVY8_2X8:
1081         case V4L2_MBUS_FMT_VYUY8_2X8:
1082         case V4L2_MBUS_FMT_YUYV8_2X8:
1083         case V4L2_MBUS_FMT_YVYU8_2X8:
1084                 if (cam->extra_fmt)
1085                         break;
1086
1087                 /*
1088                  * Our case is simple so far: for any of the above four camera
1089                  * formats we add all our four synthesized NV* formats, so,
1090                  * just marking the device with a single flag suffices. If
1091                  * the format generation rules are more complex, you would have
1092                  * to actually hang your already added / counted formats onto
1093                  * the host_priv pointer and check whether the format you're
1094                  * going to add now is already there.
1095                  */
1096                 cam->extra_fmt = sh_mobile_ceu_formats;
1097
1098                 n = ARRAY_SIZE(sh_mobile_ceu_formats);
1099                 formats += n;
1100                 for (k = 0; xlate && k < n; k++) {
1101                         xlate->host_fmt = &sh_mobile_ceu_formats[k];
1102                         xlate->code     = code;
1103                         xlate++;
1104                         dev_dbg(dev, "Providing format %s using code %d\n",
1105                                 sh_mobile_ceu_formats[k].name, code);
1106                 }
1107                 break;
1108         default:
1109                 if (!sh_mobile_ceu_packing_supported(fmt))
1110                         return 0;
1111         }
1112
1113         /* Generic pass-through */
1114         formats++;
1115         if (xlate) {
1116                 xlate->host_fmt = fmt;
1117                 xlate->code     = code;
1118                 xlate++;
1119                 dev_dbg(dev, "Providing format %s in pass-through mode\n",
1120                         fmt->name);
1121         }
1122
1123         return formats;
1124 }
1125
1126 static void sh_mobile_ceu_put_formats(struct soc_camera_device *icd)
1127 {
1128         kfree(icd->host_priv);
1129         icd->host_priv = NULL;
1130 }
1131
1132 /* Check if any dimension of r1 is smaller than respective one of r2 */
1133 static bool is_smaller(struct v4l2_rect *r1, struct v4l2_rect *r2)
1134 {
1135         return r1->width < r2->width || r1->height < r2->height;
1136 }
1137
1138 /* Check if r1 fails to cover r2 */
1139 static bool is_inside(struct v4l2_rect *r1, struct v4l2_rect *r2)
1140 {
1141         return r1->left > r2->left || r1->top > r2->top ||
1142                 r1->left + r1->width < r2->left + r2->width ||
1143                 r1->top + r1->height < r2->top + r2->height;
1144 }
1145
1146 static unsigned int scale_down(unsigned int size, unsigned int scale)
1147 {
1148         return (size * 4096 + scale / 2) / scale;
1149 }
1150
1151 static unsigned int calc_generic_scale(unsigned int input, unsigned int output)
1152 {
1153         return (input * 4096 + output / 2) / output;
1154 }
1155
1156 /* Get and store current client crop */
1157 static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect)
1158 {
1159         struct v4l2_crop crop;
1160         struct v4l2_cropcap cap;
1161         int ret;
1162
1163         crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1164
1165         ret = v4l2_subdev_call(sd, video, g_crop, &crop);
1166         if (!ret) {
1167                 *rect = crop.c;
1168                 return ret;
1169         }
1170
1171         /* Camera driver doesn't support .g_crop(), assume default rectangle */
1172         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1173
1174         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1175         if (!ret)
1176                 *rect = cap.defrect;
1177
1178         return ret;
1179 }
1180
1181 /* Client crop has changed, update our sub-rectangle to remain within the area */
1182 static void update_subrect(struct sh_mobile_ceu_cam *cam)
1183 {
1184         struct v4l2_rect *rect = &cam->rect, *subrect = &cam->subrect;
1185
1186         if (rect->width < subrect->width)
1187                 subrect->width = rect->width;
1188
1189         if (rect->height < subrect->height)
1190                 subrect->height = rect->height;
1191
1192         if (rect->left > subrect->left)
1193                 subrect->left = rect->left;
1194         else if (rect->left + rect->width >
1195                  subrect->left + subrect->width)
1196                 subrect->left = rect->left + rect->width -
1197                         subrect->width;
1198
1199         if (rect->top > subrect->top)
1200                 subrect->top = rect->top;
1201         else if (rect->top + rect->height >
1202                  subrect->top + subrect->height)
1203                 subrect->top = rect->top + rect->height -
1204                         subrect->height;
1205 }
1206
1207 /*
1208  * The common for both scaling and cropping iterative approach is:
1209  * 1. try if the client can produce exactly what requested by the user
1210  * 2. if (1) failed, try to double the client image until we get one big enough
1211  * 3. if (2) failed, try to request the maximum image
1212  */
1213 static int client_s_crop(struct soc_camera_device *icd, struct v4l2_crop *crop,
1214                          struct v4l2_crop *cam_crop)
1215 {
1216         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1217         struct v4l2_rect *rect = &crop->c, *cam_rect = &cam_crop->c;
1218         struct device *dev = sd->v4l2_dev->dev;
1219         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1220         struct v4l2_cropcap cap;
1221         int ret;
1222         unsigned int width, height;
1223
1224         v4l2_subdev_call(sd, video, s_crop, crop);
1225         ret = client_g_rect(sd, cam_rect);
1226         if (ret < 0)
1227                 return ret;
1228
1229         /*
1230          * Now cam_crop contains the current camera input rectangle, and it must
1231          * be within camera cropcap bounds
1232          */
1233         if (!memcmp(rect, cam_rect, sizeof(*rect))) {
1234                 /* Even if camera S_CROP failed, but camera rectangle matches */
1235                 dev_dbg(dev, "Camera S_CROP successful for %dx%d@%d:%d\n",
1236                         rect->width, rect->height, rect->left, rect->top);
1237                 cam->rect = *cam_rect;
1238                 return 0;
1239         }
1240
1241         /* Try to fix cropping, that camera hasn't managed to set */
1242         dev_geo(dev, "Fix camera S_CROP for %dx%d@%d:%d to %dx%d@%d:%d\n",
1243                 cam_rect->width, cam_rect->height,
1244                 cam_rect->left, cam_rect->top,
1245                 rect->width, rect->height, rect->left, rect->top);
1246
1247         /* We need sensor maximum rectangle */
1248         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1249         if (ret < 0)
1250                 return ret;
1251
1252         /* Put user requested rectangle within sensor bounds */
1253         soc_camera_limit_side(&rect->left, &rect->width, cap.bounds.left, 2,
1254                               cap.bounds.width);
1255         soc_camera_limit_side(&rect->top, &rect->height, cap.bounds.top, 4,
1256                               cap.bounds.height);
1257
1258         /*
1259          * Popular special case - some cameras can only handle fixed sizes like
1260          * QVGA, VGA,... Take care to avoid infinite loop.
1261          */
1262         width = max(cam_rect->width, 2);
1263         height = max(cam_rect->height, 2);
1264
1265         /*
1266          * Loop as long as sensor is not covering the requested rectangle and
1267          * is still within its bounds
1268          */
1269         while (!ret && (is_smaller(cam_rect, rect) ||
1270                         is_inside(cam_rect, rect)) &&
1271                (cap.bounds.width > width || cap.bounds.height > height)) {
1272
1273                 width *= 2;
1274                 height *= 2;
1275
1276                 cam_rect->width = width;
1277                 cam_rect->height = height;
1278
1279                 /*
1280                  * We do not know what capabilities the camera has to set up
1281                  * left and top borders. We could try to be smarter in iterating
1282                  * them, e.g., if camera current left is to the right of the
1283                  * target left, set it to the middle point between the current
1284                  * left and minimum left. But that would add too much
1285                  * complexity: we would have to iterate each border separately.
1286                  * Instead we just drop to the left and top bounds.
1287                  */
1288                 if (cam_rect->left > rect->left)
1289                         cam_rect->left = cap.bounds.left;
1290
1291                 if (cam_rect->left + cam_rect->width < rect->left + rect->width)
1292                         cam_rect->width = rect->left + rect->width -
1293                                 cam_rect->left;
1294
1295                 if (cam_rect->top > rect->top)
1296                         cam_rect->top = cap.bounds.top;
1297
1298                 if (cam_rect->top + cam_rect->height < rect->top + rect->height)
1299                         cam_rect->height = rect->top + rect->height -
1300                                 cam_rect->top;
1301
1302                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1303                 ret = client_g_rect(sd, cam_rect);
1304                 dev_geo(dev, "Camera S_CROP %d for %dx%d@%d:%d\n", ret,
1305                         cam_rect->width, cam_rect->height,
1306                         cam_rect->left, cam_rect->top);
1307         }
1308
1309         /* S_CROP must not modify the rectangle */
1310         if (is_smaller(cam_rect, rect) || is_inside(cam_rect, rect)) {
1311                 /*
1312                  * The camera failed to configure a suitable cropping,
1313                  * we cannot use the current rectangle, set to max
1314                  */
1315                 *cam_rect = cap.bounds;
1316                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1317                 ret = client_g_rect(sd, cam_rect);
1318                 dev_geo(dev, "Camera S_CROP %d for max %dx%d@%d:%d\n", ret,
1319                         cam_rect->width, cam_rect->height,
1320                         cam_rect->left, cam_rect->top);
1321         }
1322
1323         if (!ret) {
1324                 cam->rect = *cam_rect;
1325                 update_subrect(cam);
1326         }
1327
1328         return ret;
1329 }
1330
1331 /* Iterative s_mbus_fmt, also updates cached client crop on success */
1332 static int client_s_fmt(struct soc_camera_device *icd,
1333                         struct v4l2_mbus_framefmt *mf, bool ceu_can_scale)
1334 {
1335         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1336         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1337         struct device *dev = icd->parent;
1338         unsigned int width = mf->width, height = mf->height, tmp_w, tmp_h;
1339         unsigned int max_width, max_height;
1340         struct v4l2_cropcap cap;
1341         bool ceu_1to1;
1342         int ret;
1343
1344         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
1345                                          s_mbus_fmt, mf);
1346         if (ret < 0)
1347                 return ret;
1348
1349         dev_geo(dev, "camera scaled to %ux%u\n", mf->width, mf->height);
1350
1351         if (width == mf->width && height == mf->height) {
1352                 /* Perfect! The client has done it all. */
1353                 ceu_1to1 = true;
1354                 goto update_cache;
1355         }
1356
1357         ceu_1to1 = false;
1358         if (!ceu_can_scale)
1359                 goto update_cache;
1360
1361         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1362
1363         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1364         if (ret < 0)
1365                 return ret;
1366
1367         max_width = min(cap.bounds.width, 2560);
1368         max_height = min(cap.bounds.height, 1920);
1369
1370         /* Camera set a format, but geometry is not precise, try to improve */
1371         tmp_w = mf->width;
1372         tmp_h = mf->height;
1373
1374         /* width <= max_width && height <= max_height - guaranteed by try_fmt */
1375         while ((width > tmp_w || height > tmp_h) &&
1376                tmp_w < max_width && tmp_h < max_height) {
1377                 tmp_w = min(2 * tmp_w, max_width);
1378                 tmp_h = min(2 * tmp_h, max_height);
1379                 mf->width = tmp_w;
1380                 mf->height = tmp_h;
1381                 ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
1382                                                  s_mbus_fmt, mf);
1383                 dev_geo(dev, "Camera scaled to %ux%u\n",
1384                         mf->width, mf->height);
1385                 if (ret < 0) {
1386                         /* This shouldn't happen */
1387                         dev_err(dev, "Client failed to set format: %d\n", ret);
1388                         return ret;
1389                 }
1390         }
1391
1392 update_cache:
1393         /* Update cache */
1394         ret = client_g_rect(sd, &cam->rect);
1395         if (ret < 0)
1396                 return ret;
1397
1398         if (ceu_1to1)
1399                 cam->subrect = cam->rect;
1400         else
1401                 update_subrect(cam);
1402
1403         return 0;
1404 }
1405
1406 /**
1407  * @width       - on output: user width, mapped back to input
1408  * @height      - on output: user height, mapped back to input
1409  * @mf          - in- / output camera output window
1410  */
1411 static int client_scale(struct soc_camera_device *icd,
1412                         struct v4l2_mbus_framefmt *mf,
1413                         unsigned int *width, unsigned int *height,
1414                         bool ceu_can_scale)
1415 {
1416         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1417         struct device *dev = icd->parent;
1418         struct v4l2_mbus_framefmt mf_tmp = *mf;
1419         unsigned int scale_h, scale_v;
1420         int ret;
1421
1422         /*
1423          * 5. Apply iterative camera S_FMT for camera user window (also updates
1424          *    client crop cache and the imaginary sub-rectangle).
1425          */
1426         ret = client_s_fmt(icd, &mf_tmp, ceu_can_scale);
1427         if (ret < 0)
1428                 return ret;
1429
1430         dev_geo(dev, "5: camera scaled to %ux%u\n",
1431                 mf_tmp.width, mf_tmp.height);
1432
1433         /* 6. Retrieve camera output window (g_fmt) */
1434
1435         /* unneeded - it is already in "mf_tmp" */
1436
1437         /* 7. Calculate new client scales. */
1438         scale_h = calc_generic_scale(cam->rect.width, mf_tmp.width);
1439         scale_v = calc_generic_scale(cam->rect.height, mf_tmp.height);
1440
1441         mf->width       = mf_tmp.width;
1442         mf->height      = mf_tmp.height;
1443         mf->colorspace  = mf_tmp.colorspace;
1444
1445         /*
1446          * 8. Calculate new CEU crop - apply camera scales to previously
1447          *    updated "effective" crop.
1448          */
1449         *width = scale_down(cam->subrect.width, scale_h);
1450         *height = scale_down(cam->subrect.height, scale_v);
1451
1452         dev_geo(dev, "8: new client sub-window %ux%u\n", *width, *height);
1453
1454         return 0;
1455 }
1456
1457 /*
1458  * CEU can scale and crop, but we don't want to waste bandwidth and kill the
1459  * framerate by always requesting the maximum image from the client. See
1460  * Documentation/video4linux/sh_mobile_ceu_camera.txt for a description of
1461  * scaling and cropping algorithms and for the meaning of referenced here steps.
1462  */
1463 static int sh_mobile_ceu_set_crop(struct soc_camera_device *icd,
1464                                   struct v4l2_crop *a)
1465 {
1466         struct v4l2_rect *rect = &a->c;
1467         struct device *dev = icd->parent;
1468         struct soc_camera_host *ici = to_soc_camera_host(dev);
1469         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1470         struct v4l2_crop cam_crop;
1471         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1472         struct v4l2_rect *cam_rect = &cam_crop.c;
1473         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1474         struct v4l2_mbus_framefmt mf;
1475         unsigned int scale_cam_h, scale_cam_v, scale_ceu_h, scale_ceu_v,
1476                 out_width, out_height;
1477         int interm_width, interm_height;
1478         u32 capsr, cflcr;
1479         int ret;
1480
1481         dev_geo(dev, "S_CROP(%ux%u@%u:%u)\n", rect->width, rect->height,
1482                 rect->left, rect->top);
1483
1484         /* During camera cropping its output window can change too, stop CEU */
1485         capsr = capture_save_reset(pcdev);
1486         dev_dbg(dev, "CAPSR 0x%x, CFLCR 0x%x\n", capsr, pcdev->cflcr);
1487
1488         /*
1489          * 1. - 2. Apply iterative camera S_CROP for new input window, read back
1490          * actual camera rectangle.
1491          */
1492         ret = client_s_crop(icd, a, &cam_crop);
1493         if (ret < 0)
1494                 return ret;
1495
1496         dev_geo(dev, "1-2: camera cropped to %ux%u@%u:%u\n",
1497                 cam_rect->width, cam_rect->height,
1498                 cam_rect->left, cam_rect->top);
1499
1500         /* On success cam_crop contains current camera crop */
1501
1502         /* 3. Retrieve camera output window */
1503         ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
1504         if (ret < 0)
1505                 return ret;
1506
1507         if (mf.width > 2560 || mf.height > 1920)
1508                 return -EINVAL;
1509
1510         /* 4. Calculate camera scales */
1511         scale_cam_h     = calc_generic_scale(cam_rect->width, mf.width);
1512         scale_cam_v     = calc_generic_scale(cam_rect->height, mf.height);
1513
1514         /* Calculate intermediate window */
1515         interm_width    = scale_down(rect->width, scale_cam_h);
1516         interm_height   = scale_down(rect->height, scale_cam_v);
1517
1518         if (interm_width < icd->user_width) {
1519                 u32 new_scale_h;
1520
1521                 new_scale_h = calc_generic_scale(rect->width, icd->user_width);
1522
1523                 mf.width = scale_down(cam_rect->width, new_scale_h);
1524         }
1525
1526         if (interm_height < icd->user_height) {
1527                 u32 new_scale_v;
1528
1529                 new_scale_v = calc_generic_scale(rect->height, icd->user_height);
1530
1531                 mf.height = scale_down(cam_rect->height, new_scale_v);
1532         }
1533
1534         if (interm_width < icd->user_width || interm_height < icd->user_height) {
1535                 ret = v4l2_device_call_until_err(sd->v4l2_dev, (int)icd, video,
1536                                                  s_mbus_fmt, &mf);
1537                 if (ret < 0)
1538                         return ret;
1539
1540                 dev_geo(dev, "New camera output %ux%u\n", mf.width, mf.height);
1541                 scale_cam_h     = calc_generic_scale(cam_rect->width, mf.width);
1542                 scale_cam_v     = calc_generic_scale(cam_rect->height, mf.height);
1543                 interm_width    = scale_down(rect->width, scale_cam_h);
1544                 interm_height   = scale_down(rect->height, scale_cam_v);
1545         }
1546
1547         /* Cache camera output window */
1548         cam->width      = mf.width;
1549         cam->height     = mf.height;
1550
1551         if (pcdev->image_mode) {
1552                 out_width       = min(interm_width, icd->user_width);
1553                 out_height      = min(interm_height, icd->user_height);
1554         } else {
1555                 out_width       = interm_width;
1556                 out_height      = interm_height;
1557         }
1558
1559         /*
1560          * 5. Calculate CEU scales from camera scales from results of (5) and
1561          *    the user window
1562          */
1563         scale_ceu_h     = calc_scale(interm_width, &out_width);
1564         scale_ceu_v     = calc_scale(interm_height, &out_height);
1565
1566         dev_geo(dev, "5: CEU scales %u:%u\n", scale_ceu_h, scale_ceu_v);
1567
1568         /* Apply CEU scales. */
1569         cflcr = scale_ceu_h | (scale_ceu_v << 16);
1570         if (cflcr != pcdev->cflcr) {
1571                 pcdev->cflcr = cflcr;
1572                 ceu_write(pcdev, CFLCR, cflcr);
1573         }
1574
1575         icd->user_width  = out_width & ~3;
1576         icd->user_height = out_height & ~3;
1577         /* Offsets are applied at the CEU scaling filter input */
1578         cam->ceu_left    = scale_down(rect->left - cam_rect->left, scale_cam_h) & ~1;
1579         cam->ceu_top     = scale_down(rect->top - cam_rect->top, scale_cam_v) & ~1;
1580
1581         /* 6. Use CEU cropping to crop to the new window. */
1582         sh_mobile_ceu_set_rect(icd);
1583
1584         cam->subrect = *rect;
1585
1586         dev_geo(dev, "6: CEU cropped to %ux%u@%u:%u\n",
1587                 icd->user_width, icd->user_height,
1588                 cam->ceu_left, cam->ceu_top);
1589
1590         /* Restore capture. The CE bit can be cleared by the hardware */
1591         if (pcdev->active)
1592                 capsr |= 1;
1593         capture_restore(pcdev, capsr);
1594
1595         /* Even if only camera cropping succeeded */
1596         return ret;
1597 }
1598
1599 static int sh_mobile_ceu_get_crop(struct soc_camera_device *icd,
1600                                   struct v4l2_crop *a)
1601 {
1602         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1603
1604         a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1605         a->c = cam->subrect;
1606
1607         return 0;
1608 }
1609
1610 /*
1611  * Calculate real client output window by applying new scales to the current
1612  * client crop. New scales are calculated from the requested output format and
1613  * CEU crop, mapped backed onto the client input (subrect).
1614  */
1615 static void calculate_client_output(struct soc_camera_device *icd,
1616                 const struct v4l2_pix_format *pix, struct v4l2_mbus_framefmt *mf)
1617 {
1618         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1619         struct device *dev = icd->parent;
1620         struct v4l2_rect *cam_subrect = &cam->subrect;
1621         unsigned int scale_v, scale_h;
1622
1623         if (cam_subrect->width == cam->rect.width &&
1624             cam_subrect->height == cam->rect.height) {
1625                 /* No sub-cropping */
1626                 mf->width       = pix->width;
1627                 mf->height      = pix->height;
1628                 return;
1629         }
1630
1631         /* 1.-2. Current camera scales and subwin - cached. */
1632
1633         dev_geo(dev, "2: subwin %ux%u@%u:%u\n",
1634                 cam_subrect->width, cam_subrect->height,
1635                 cam_subrect->left, cam_subrect->top);
1636
1637         /*
1638          * 3. Calculate new combined scales from input sub-window to requested
1639          *    user window.
1640          */
1641
1642         /*
1643          * TODO: CEU cannot scale images larger than VGA to smaller than SubQCIF
1644          * (128x96) or larger than VGA
1645          */
1646         scale_h = calc_generic_scale(cam_subrect->width, pix->width);
1647         scale_v = calc_generic_scale(cam_subrect->height, pix->height);
1648
1649         dev_geo(dev, "3: scales %u:%u\n", scale_h, scale_v);
1650
1651         /*
1652          * 4. Calculate desired client output window by applying combined scales
1653          *    to client (real) input window.
1654          */
1655         mf->width       = scale_down(cam->rect.width, scale_h);
1656         mf->height      = scale_down(cam->rect.height, scale_v);
1657 }
1658
1659 /* Similar to set_crop multistage iterative algorithm */
1660 static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
1661                                  struct v4l2_format *f)
1662 {
1663         struct device *dev = icd->parent;
1664         struct soc_camera_host *ici = to_soc_camera_host(dev);
1665         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1666         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1667         struct v4l2_pix_format *pix = &f->fmt.pix;
1668         struct v4l2_mbus_framefmt mf;
1669         __u32 pixfmt = pix->pixelformat;
1670         const struct soc_camera_format_xlate *xlate;
1671         /* Keep Compiler Happy */
1672         unsigned int ceu_sub_width = 0, ceu_sub_height = 0;
1673         u16 scale_v, scale_h;
1674         int ret;
1675         bool image_mode;
1676         enum v4l2_field field;
1677
1678         switch (pix->field) {
1679         default:
1680                 pix->field = V4L2_FIELD_NONE;
1681                 /* fall-through */
1682         case V4L2_FIELD_INTERLACED_TB:
1683         case V4L2_FIELD_INTERLACED_BT:
1684         case V4L2_FIELD_NONE:
1685                 field = pix->field;
1686                 break;
1687         case V4L2_FIELD_INTERLACED:
1688                 field = V4L2_FIELD_INTERLACED_TB;
1689                 break;
1690         }
1691
1692         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1693         if (!xlate) {
1694                 dev_warn(dev, "Format %x not found\n", pixfmt);
1695                 return -EINVAL;
1696         }
1697
1698         /* 1.-4. Calculate desired client output geometry */
1699         calculate_client_output(icd, pix, &mf);
1700         mf.field        = pix->field;
1701         mf.colorspace   = pix->colorspace;
1702         mf.code         = xlate->code;
1703
1704         switch (pixfmt) {
1705         case V4L2_PIX_FMT_NV12:
1706         case V4L2_PIX_FMT_NV21:
1707         case V4L2_PIX_FMT_NV16:
1708         case V4L2_PIX_FMT_NV61:
1709                 image_mode = true;
1710                 break;
1711         default:
1712                 image_mode = false;
1713         }
1714
1715         dev_info(dev, "S_FMT(pix=0x%x, fld 0x%x, code 0x%x, %ux%u)\n", pixfmt, mf.field, mf.code,
1716                 pix->width, pix->height);
1717
1718         dev_geo(dev, "4: request camera output %ux%u\n", mf.width, mf.height);
1719
1720         /* 5. - 9. */
1721         ret = client_scale(icd, &mf, &ceu_sub_width, &ceu_sub_height,
1722                            image_mode && V4L2_FIELD_NONE == field);
1723
1724         dev_geo(dev, "5-9: client scale return %d\n", ret);
1725
1726         /* Done with the camera. Now see if we can improve the result */
1727
1728         dev_geo(dev, "fmt %ux%u, requested %ux%u\n",
1729                 mf.width, mf.height, pix->width, pix->height);
1730         if (ret < 0)
1731                 return ret;
1732
1733         if (mf.code != xlate->code)
1734                 return -EINVAL;
1735
1736         /* 9. Prepare CEU crop */
1737         cam->width = mf.width;
1738         cam->height = mf.height;
1739
1740         /* 10. Use CEU scaling to scale to the requested user window. */
1741
1742         /* We cannot scale up */
1743         if (pix->width > ceu_sub_width)
1744                 ceu_sub_width = pix->width;
1745
1746         if (pix->height > ceu_sub_height)
1747                 ceu_sub_height = pix->height;
1748
1749         pix->colorspace = mf.colorspace;
1750
1751         if (image_mode) {
1752                 /* Scale pix->{width x height} down to width x height */
1753                 scale_h         = calc_scale(ceu_sub_width, &pix->width);
1754                 scale_v         = calc_scale(ceu_sub_height, &pix->height);
1755         } else {
1756                 pix->width      = ceu_sub_width;
1757                 pix->height     = ceu_sub_height;
1758                 scale_h         = 0;
1759                 scale_v         = 0;
1760         }
1761
1762         pcdev->cflcr = scale_h | (scale_v << 16);
1763
1764         /*
1765          * We have calculated CFLCR, the actual configuration will be performed
1766          * in sh_mobile_ceu_set_bus_param()
1767          */
1768
1769         dev_geo(dev, "10: W: %u : 0x%x = %u, H: %u : 0x%x = %u\n",
1770                 ceu_sub_width, scale_h, pix->width,
1771                 ceu_sub_height, scale_v, pix->height);
1772
1773         cam->code               = xlate->code;
1774         icd->current_fmt        = xlate;
1775
1776         pcdev->field = field;
1777         pcdev->image_mode = image_mode;
1778
1779         /* CFSZR requirement */
1780         pix->width      &= ~3;
1781         pix->height     &= ~3;
1782
1783         return 0;
1784 }
1785
1786 static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
1787                                  struct v4l2_format *f)
1788 {
1789         const struct soc_camera_format_xlate *xlate;
1790         struct v4l2_pix_format *pix = &f->fmt.pix;
1791         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1792         struct v4l2_mbus_framefmt mf;
1793         __u32 pixfmt = pix->pixelformat;
1794         int width, height;
1795         int ret;
1796
1797         dev_geo(icd->parent, "TRY_FMT(pix=0x%x, %ux%u)\n",
1798                  pixfmt, pix->width, pix->height);
1799
1800         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1801         if (!xlate) {
1802                 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
1803                 return -EINVAL;
1804         }
1805
1806         /* FIXME: calculate using depth and bus width */
1807
1808         /* CFSZR requires height and width to be 4-pixel aligned */
1809         v4l_bound_align_image(&pix->width, 2, 2560, 2,
1810                               &pix->height, 4, 1920, 2, 0);
1811
1812         width = pix->width;
1813         height = pix->height;
1814
1815         /* limit to sensor capabilities */
1816         mf.width        = pix->width;
1817         mf.height       = pix->height;
1818         mf.field        = pix->field;
1819         mf.code         = xlate->code;
1820         mf.colorspace   = pix->colorspace;
1821
1822         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video, try_mbus_fmt, &mf);
1823         if (ret < 0)
1824                 return ret;
1825
1826         pix->width      = mf.width;
1827         pix->height     = mf.height;
1828         pix->field      = mf.field;
1829         pix->colorspace = mf.colorspace;
1830
1831         switch (pixfmt) {
1832         case V4L2_PIX_FMT_NV12:
1833         case V4L2_PIX_FMT_NV21:
1834         case V4L2_PIX_FMT_NV16:
1835         case V4L2_PIX_FMT_NV61:
1836                 /* FIXME: check against rect_max after converting soc-camera */
1837                 /* We can scale precisely, need a bigger image from camera */
1838                 if (pix->width < width || pix->height < height) {
1839                         /*
1840                          * We presume, the sensor behaves sanely, i.e., if
1841                          * requested a bigger rectangle, it will not return a
1842                          * smaller one.
1843                          */
1844                         mf.width = 2560;
1845                         mf.height = 1920;
1846                         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
1847                                                          try_mbus_fmt, &mf);
1848                         if (ret < 0) {
1849                                 /* Shouldn't actually happen... */
1850                                 dev_err(icd->parent,
1851                                         "FIXME: client try_fmt() = %d\n", ret);
1852                                 return ret;
1853                         }
1854                 }
1855                 /* We will scale exactly */
1856                 if (mf.width > width)
1857                         pix->width = width;
1858                 if (mf.height > height)
1859                         pix->height = height;
1860         }
1861
1862         pix->width      &= ~3;
1863         pix->height     &= ~3;
1864
1865         dev_geo(icd->parent, "%s(): return %d, fmt 0x%x, %ux%u\n",
1866                 __func__, ret, pix->pixelformat, pix->width, pix->height);
1867
1868         return ret;
1869 }
1870
1871 static int sh_mobile_ceu_set_livecrop(struct soc_camera_device *icd,
1872                                       struct v4l2_crop *a)
1873 {
1874         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1875         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1876         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1877         u32 out_width = icd->user_width, out_height = icd->user_height;
1878         int ret;
1879
1880         /* Freeze queue */
1881         pcdev->frozen = 1;
1882         /* Wait for frame */
1883         ret = wait_for_completion_interruptible(&pcdev->complete);
1884         /* Stop the client */
1885         ret = v4l2_subdev_call(sd, video, s_stream, 0);
1886         if (ret < 0)
1887                 dev_warn(icd->parent,
1888                          "Client failed to stop the stream: %d\n", ret);
1889         else
1890                 /* Do the crop, if it fails, there's nothing more we can do */
1891                 sh_mobile_ceu_set_crop(icd, a);
1892
1893         dev_geo(icd->parent, "Output after crop: %ux%u\n", icd->user_width, icd->user_height);
1894
1895         if (icd->user_width != out_width || icd->user_height != out_height) {
1896                 struct v4l2_format f = {
1897                         .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1898                         .fmt.pix        = {
1899                                 .width          = out_width,
1900                                 .height         = out_height,
1901                                 .pixelformat    = icd->current_fmt->host_fmt->fourcc,
1902                                 .field          = pcdev->field,
1903                                 .colorspace     = icd->colorspace,
1904                         },
1905                 };
1906                 ret = sh_mobile_ceu_set_fmt(icd, &f);
1907                 if (!ret && (out_width != f.fmt.pix.width ||
1908                              out_height != f.fmt.pix.height))
1909                         ret = -EINVAL;
1910                 if (!ret) {
1911                         icd->user_width         = out_width & ~3;
1912                         icd->user_height        = out_height & ~3;
1913                         ret = sh_mobile_ceu_set_bus_param(icd,
1914                                         icd->current_fmt->host_fmt->fourcc);
1915                 }
1916         }
1917
1918         /* Thaw the queue */
1919         pcdev->frozen = 0;
1920         spin_lock_irq(&pcdev->lock);
1921         sh_mobile_ceu_capture(pcdev);
1922         spin_unlock_irq(&pcdev->lock);
1923         /* Start the client */
1924         ret = v4l2_subdev_call(sd, video, s_stream, 1);
1925         return ret;
1926 }
1927
1928 static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
1929 {
1930         struct soc_camera_device *icd = file->private_data;
1931
1932         return vb2_poll(&icd->vb2_vidq, file, pt);
1933 }
1934
1935 static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
1936                                   struct v4l2_capability *cap)
1937 {
1938         strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
1939         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1940         return 0;
1941 }
1942
1943 static int sh_mobile_ceu_init_videobuf(struct vb2_queue *q,
1944                                        struct soc_camera_device *icd)
1945 {
1946         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1947         q->io_modes = VB2_MMAP | VB2_USERPTR;
1948         q->drv_priv = icd;
1949         q->ops = &sh_mobile_ceu_videobuf_ops;
1950         q->mem_ops = &vb2_dma_contig_memops;
1951         q->buf_struct_size = sizeof(struct sh_mobile_ceu_buffer);
1952
1953         return vb2_queue_init(q);
1954 }
1955
1956 static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
1957         .owner          = THIS_MODULE,
1958         .add            = sh_mobile_ceu_add_device,
1959         .remove         = sh_mobile_ceu_remove_device,
1960         .get_formats    = sh_mobile_ceu_get_formats,
1961         .put_formats    = sh_mobile_ceu_put_formats,
1962         .get_crop       = sh_mobile_ceu_get_crop,
1963         .set_crop       = sh_mobile_ceu_set_crop,
1964         .set_livecrop   = sh_mobile_ceu_set_livecrop,
1965         .set_fmt        = sh_mobile_ceu_set_fmt,
1966         .try_fmt        = sh_mobile_ceu_try_fmt,
1967         .poll           = sh_mobile_ceu_poll,
1968         .querycap       = sh_mobile_ceu_querycap,
1969         .set_bus_param  = sh_mobile_ceu_set_bus_param,
1970         .init_videobuf2 = sh_mobile_ceu_init_videobuf,
1971 };
1972
1973 struct bus_wait {
1974         struct notifier_block   notifier;
1975         struct completion       completion;
1976         struct device           *dev;
1977 };
1978
1979 static int bus_notify(struct notifier_block *nb,
1980                       unsigned long action, void *data)
1981 {
1982         struct device *dev = data;
1983         struct bus_wait *wait = container_of(nb, struct bus_wait, notifier);
1984
1985         if (wait->dev != dev)
1986                 return NOTIFY_DONE;
1987
1988         switch (action) {
1989         case BUS_NOTIFY_UNBOUND_DRIVER:
1990                 /* Protect from module unloading */
1991                 wait_for_completion(&wait->completion);
1992                 return NOTIFY_OK;
1993         }
1994         return NOTIFY_DONE;
1995 }
1996
1997 static int __devinit sh_mobile_ceu_probe(struct platform_device *pdev)
1998 {
1999         struct sh_mobile_ceu_dev *pcdev;
2000         struct resource *res;
2001         void __iomem *base;
2002         unsigned int irq;
2003         int err = 0;
2004         struct bus_wait wait = {
2005                 .completion = COMPLETION_INITIALIZER_ONSTACK(wait.completion),
2006                 .notifier.notifier_call = bus_notify,
2007         };
2008         struct sh_mobile_ceu_companion *csi2;
2009
2010         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2011         irq = platform_get_irq(pdev, 0);
2012         if (!res || (int)irq <= 0) {
2013                 dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
2014                 err = -ENODEV;
2015                 goto exit;
2016         }
2017
2018         pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
2019         if (!pcdev) {
2020                 dev_err(&pdev->dev, "Could not allocate pcdev\n");
2021                 err = -ENOMEM;
2022                 goto exit;
2023         }
2024
2025         INIT_LIST_HEAD(&pcdev->capture);
2026         spin_lock_init(&pcdev->lock);
2027         init_completion(&pcdev->complete);
2028
2029         pcdev->pdata = pdev->dev.platform_data;
2030         if (!pcdev->pdata) {
2031                 err = -EINVAL;
2032                 dev_err(&pdev->dev, "CEU platform data not set.\n");
2033                 goto exit_kfree;
2034         }
2035
2036         base = ioremap_nocache(res->start, resource_size(res));
2037         if (!base) {
2038                 err = -ENXIO;
2039                 dev_err(&pdev->dev, "Unable to ioremap CEU registers.\n");
2040                 goto exit_kfree;
2041         }
2042
2043         pcdev->irq = irq;
2044         pcdev->base = base;
2045         pcdev->video_limit = 0; /* only enabled if second resource exists */
2046
2047         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
2048         if (res) {
2049                 err = dma_declare_coherent_memory(&pdev->dev, res->start,
2050                                                   res->start,
2051                                                   resource_size(res),
2052                                                   DMA_MEMORY_MAP |
2053                                                   DMA_MEMORY_EXCLUSIVE);
2054                 if (!err) {
2055                         dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
2056                         err = -ENXIO;
2057                         goto exit_iounmap;
2058                 }
2059
2060                 pcdev->video_limit = resource_size(res);
2061         }
2062
2063         /* request irq */
2064         err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED,
2065                           dev_name(&pdev->dev), pcdev);
2066         if (err) {
2067                 dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
2068                 goto exit_release_mem;
2069         }
2070
2071         pm_suspend_ignore_children(&pdev->dev, true);
2072         pm_runtime_enable(&pdev->dev);
2073         pm_runtime_resume(&pdev->dev);
2074
2075         pcdev->ici.priv = pcdev;
2076         pcdev->ici.v4l2_dev.dev = &pdev->dev;
2077         pcdev->ici.nr = pdev->id;
2078         pcdev->ici.drv_name = dev_name(&pdev->dev);
2079         pcdev->ici.ops = &sh_mobile_ceu_host_ops;
2080
2081         pcdev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
2082         if (IS_ERR(pcdev->alloc_ctx)) {
2083                 err = PTR_ERR(pcdev->alloc_ctx);
2084                 goto exit_free_clk;
2085         }
2086
2087         err = soc_camera_host_register(&pcdev->ici);
2088         if (err)
2089                 goto exit_free_ctx;
2090
2091         /* CSI2 interfacing */
2092         csi2 = pcdev->pdata->csi2;
2093         if (csi2) {
2094                 struct platform_device *csi2_pdev =
2095                         platform_device_alloc("sh-mobile-csi2", csi2->id);
2096                 struct sh_csi2_pdata *csi2_pdata = csi2->platform_data;
2097
2098                 if (!csi2_pdev) {
2099                         err = -ENOMEM;
2100                         goto exit_host_unregister;
2101                 }
2102
2103                 pcdev->csi2_pdev                = csi2_pdev;
2104
2105                 err = platform_device_add_data(csi2_pdev, csi2_pdata, sizeof(*csi2_pdata));
2106                 if (err < 0)
2107                         goto exit_pdev_put;
2108
2109                 csi2_pdata                      = csi2_pdev->dev.platform_data;
2110                 csi2_pdata->v4l2_dev            = &pcdev->ici.v4l2_dev;
2111
2112                 csi2_pdev->resource             = csi2->resource;
2113                 csi2_pdev->num_resources        = csi2->num_resources;
2114
2115                 err = platform_device_add(csi2_pdev);
2116                 if (err < 0)
2117                         goto exit_pdev_put;
2118
2119                 wait.dev = &csi2_pdev->dev;
2120
2121                 err = bus_register_notifier(&platform_bus_type, &wait.notifier);
2122                 if (err < 0)
2123                         goto exit_pdev_unregister;
2124
2125                 /*
2126                  * From this point the driver module will not unload, until
2127                  * we complete the completion.
2128                  */
2129
2130                 if (!csi2_pdev->dev.driver) {
2131                         complete(&wait.completion);
2132                         /* Either too late, or probing failed */
2133                         bus_unregister_notifier(&platform_bus_type, &wait.notifier);
2134                         err = -ENXIO;
2135                         goto exit_pdev_unregister;
2136                 }
2137
2138                 /*
2139                  * The module is still loaded, in the worst case it is hanging
2140                  * in device release on our completion. So, _now_ dereferencing
2141                  * the "owner" is safe!
2142                  */
2143
2144                 err = try_module_get(csi2_pdev->dev.driver->owner);
2145
2146                 /* Let notifier complete, if it has been locked */
2147                 complete(&wait.completion);
2148                 bus_unregister_notifier(&platform_bus_type, &wait.notifier);
2149                 if (!err) {
2150                         err = -ENODEV;
2151                         goto exit_pdev_unregister;
2152                 }
2153         }
2154
2155         return 0;
2156
2157 exit_pdev_unregister:
2158         platform_device_del(pcdev->csi2_pdev);
2159 exit_pdev_put:
2160         pcdev->csi2_pdev->resource = NULL;
2161         platform_device_put(pcdev->csi2_pdev);
2162 exit_host_unregister:
2163         soc_camera_host_unregister(&pcdev->ici);
2164 exit_free_ctx:
2165         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
2166 exit_free_clk:
2167         pm_runtime_disable(&pdev->dev);
2168         free_irq(pcdev->irq, pcdev);
2169 exit_release_mem:
2170         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
2171                 dma_release_declared_memory(&pdev->dev);
2172 exit_iounmap:
2173         iounmap(base);
2174 exit_kfree:
2175         kfree(pcdev);
2176 exit:
2177         return err;
2178 }
2179
2180 static int __devexit sh_mobile_ceu_remove(struct platform_device *pdev)
2181 {
2182         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
2183         struct sh_mobile_ceu_dev *pcdev = container_of(soc_host,
2184                                         struct sh_mobile_ceu_dev, ici);
2185         struct platform_device *csi2_pdev = pcdev->csi2_pdev;
2186
2187         soc_camera_host_unregister(soc_host);
2188         pm_runtime_disable(&pdev->dev);
2189         free_irq(pcdev->irq, pcdev);
2190         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
2191                 dma_release_declared_memory(&pdev->dev);
2192         iounmap(pcdev->base);
2193         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
2194         if (csi2_pdev && csi2_pdev->dev.driver) {
2195                 struct module *csi2_drv = csi2_pdev->dev.driver->owner;
2196                 platform_device_del(csi2_pdev);
2197                 csi2_pdev->resource = NULL;
2198                 platform_device_put(csi2_pdev);
2199                 module_put(csi2_drv);
2200         }
2201         kfree(pcdev);
2202
2203         return 0;
2204 }
2205
2206 static int sh_mobile_ceu_runtime_nop(struct device *dev)
2207 {
2208         /* Runtime PM callback shared between ->runtime_suspend()
2209          * and ->runtime_resume(). Simply returns success.
2210          *
2211          * This driver re-initializes all registers after
2212          * pm_runtime_get_sync() anyway so there is no need
2213          * to save and restore registers here.
2214          */
2215         return 0;
2216 }
2217
2218 static const struct dev_pm_ops sh_mobile_ceu_dev_pm_ops = {
2219         .runtime_suspend = sh_mobile_ceu_runtime_nop,
2220         .runtime_resume = sh_mobile_ceu_runtime_nop,
2221 };
2222
2223 static struct platform_driver sh_mobile_ceu_driver = {
2224         .driver         = {
2225                 .name   = "sh_mobile_ceu",
2226                 .pm     = &sh_mobile_ceu_dev_pm_ops,
2227         },
2228         .probe          = sh_mobile_ceu_probe,
2229         .remove         = __devexit_p(sh_mobile_ceu_remove),
2230 };
2231
2232 static int __init sh_mobile_ceu_init(void)
2233 {
2234         /* Whatever return code */
2235         request_module("sh_mobile_csi2");
2236         return platform_driver_register(&sh_mobile_ceu_driver);
2237 }
2238
2239 static void __exit sh_mobile_ceu_exit(void)
2240 {
2241         platform_driver_unregister(&sh_mobile_ceu_driver);
2242 }
2243
2244 module_init(sh_mobile_ceu_init);
2245 module_exit(sh_mobile_ceu_exit);
2246
2247 MODULE_DESCRIPTION("SuperH Mobile CEU driver");
2248 MODULE_AUTHOR("Magnus Damm");
2249 MODULE_LICENSE("GPL");
2250 MODULE_VERSION("0.0.6");
2251 MODULE_ALIAS("platform:sh_mobile_ceu");