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 };
  94
  95 struct sh_mobile_ceu_dev {
  96         struct soc_camera_host ici;
  97         struct soc_camera_device *icd;
  98         struct platform_device *csi2_pdev;
  99
 100         unsigned int irq;
 101         void __iomem *base;
 102         size_t video_limit;
 103         size_t buf_total;
 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
 196 /*
 197  * .queue_setup() is called to check, whether the driver can accept the
 198  *                requested number of buffers and to fill in plane sizes
 199  *                for the current frame format if required
 200  */
 201 static int sh_mobile_ceu_videobuf_setup(struct vb2_queue *vq,
 202                         const struct v4l2_format *fmt,
 203                         unsigned int *count, unsigned int *num_planes,
 204                         unsigned int sizes[], void *alloc_ctxs[])
 205 {
 206         struct soc_camera_device *icd = container_of(vq, struct soc_camera_device, vb2_vidq);
 207         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 208         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 209         int bytes_per_line;
 210         unsigned int height;
 211
 212         if (fmt) {
 213                 const struct soc_camera_format_xlate *xlate = soc_camera_xlate_by_fourcc(icd,
 214                                                                 fmt->fmt.pix.pixelformat);
 215                 if (!xlate)
 216                         return -EINVAL;
 217                 bytes_per_line = soc_mbus_bytes_per_line(fmt->fmt.pix.width,
 218                                                          xlate->host_fmt);
 219                 height = fmt->fmt.pix.height;
 220         } else {
 221                 /* Called from VIDIOC_REQBUFS or in compatibility mode */
 222                 bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 223                                                 icd->current_fmt->host_fmt);
 224                 height = icd->user_height;
 225         }
 226         if (bytes_per_line < 0)
 227                 return bytes_per_line;
 228
 229         sizes[0] = bytes_per_line * height;
 230
 231         alloc_ctxs[0] = pcdev->alloc_ctx;
 232
 233         if (!vq->num_buffers)
 234                 pcdev->sequence = 0;
 235
 236         if (!*count)
 237                 *count = 2;
 238
 239         /* If *num_planes != 0, we have already verified *count. */
 240         if (pcdev->video_limit && !*num_planes) {
 241                 size_t size = PAGE_ALIGN(sizes[0]) * *count;
 242
 243                 if (size + pcdev->buf_total > pcdev->video_limit)
 244                         *count = (pcdev->video_limit - pcdev->buf_total) /
 245                                 PAGE_ALIGN(sizes[0]);
 246         }
 247
 248         *num_planes = 1;
 249
 250         dev_dbg(icd->parent, "count=%d, size=%u\n", *count, sizes[0]);
 251
 252         return 0;
 253 }
 254
 255 #define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */
 256 #define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */
 257 #define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */
 258 #define CEU_CEIER_VBP   (1 << 20) /* vbp error */
 259 #define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */
 260 #define CEU_CEIER_MASK (CEU_CEIER_CPEIE | CEU_CEIER_VBP)
 261
 262
 263 /*
 264  * return value doesn't reflex the success/failure to queue the new buffer,
 265  * but rather the status of the previous buffer.
 266  */
 267 static int sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
 268 {
 269         struct soc_camera_device *icd = pcdev->icd;
 270         dma_addr_t phys_addr_top, phys_addr_bottom;
 271         unsigned long top1, top2;
 272         unsigned long bottom1, bottom2;
 273         u32 status;
 274         bool planar;
 275         int ret = 0;
 276
 277         /*
 278          * The hardware is _very_ picky about this sequence. Especially
 279          * the CEU_CETCR_MAGIC value. It seems like we need to acknowledge
 280          * several not-so-well documented interrupt sources in CETCR.
 281          */
 282         ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_MASK);
 283         status = ceu_read(pcdev, CETCR);
 284         ceu_write(pcdev, CETCR, ~status & CEU_CETCR_MAGIC);
 285         if (!pcdev->frozen)
 286                 ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_MASK);
 287         ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP);
 288         ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW);
 289
 290         /*
 291          * When a VBP interrupt occurs, a capture end interrupt does not occur
 292          * and the image of that frame is not captured correctly. So, soft reset
 293          * is needed here.
 294          */
 295         if (status & CEU_CEIER_VBP) {
 296                 sh_mobile_ceu_soft_reset(pcdev);
 297                 ret = -EIO;
 298         }
 299
 300         if (pcdev->frozen) {
 301                 complete(&pcdev->complete);
 302                 return ret;
 303         }
 304
 305         if (!pcdev->active)
 306                 return ret;
 307
 308         if (V4L2_FIELD_INTERLACED_BT == pcdev->field) {
 309                 top1    = CDBYR;
 310                 top2    = CDBCR;
 311                 bottom1 = CDAYR;
 312                 bottom2 = CDACR;
 313         } else {
 314                 top1    = CDAYR;
 315                 top2    = CDACR;
 316                 bottom1 = CDBYR;
 317                 bottom2 = CDBCR;
 318         }
 319
 320         phys_addr_top = vb2_dma_contig_plane_dma_addr(pcdev->active, 0);
 321
 322         switch (icd->current_fmt->host_fmt->fourcc) {
 323         case V4L2_PIX_FMT_NV12:
 324         case V4L2_PIX_FMT_NV21:
 325         case V4L2_PIX_FMT_NV16:
 326         case V4L2_PIX_FMT_NV61:
 327                 planar = true;
 328                 break;
 329         default:
 330                 planar = false;
 331         }
 332
 333         ceu_write(pcdev, top1, phys_addr_top);
 334         if (V4L2_FIELD_NONE != pcdev->field) {
 335                 if (planar)
 336                         phys_addr_bottom = phys_addr_top + icd->user_width;
 337                 else
 338                         phys_addr_bottom = phys_addr_top +
 339                                 soc_mbus_bytes_per_line(icd->user_width,
 340                                                         icd->current_fmt->host_fmt);
 341                 ceu_write(pcdev, bottom1, phys_addr_bottom);
 342         }
 343
 344         if (planar) {
 345                 phys_addr_top += icd->user_width *
 346                         icd->user_height;
 347                 ceu_write(pcdev, top2, phys_addr_top);
 348                 if (V4L2_FIELD_NONE != pcdev->field) {
 349                         phys_addr_bottom = phys_addr_top + icd->user_width;
 350                         ceu_write(pcdev, bottom2, phys_addr_bottom);
 351                 }
 352         }
 353
 354         ceu_write(pcdev, CAPSR, 0x1); /* start capture */
 355
 356         return ret;
 357 }
 358
 359 static int sh_mobile_ceu_videobuf_prepare(struct vb2_buffer *vb)
 360 {
 361         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb);
 362
 363         /* Added list head initialization on alloc */
 364         WARN(!list_empty(&buf->queue), "Buffer %p on queue!\n", vb);
 365
 366         return 0;
 367 }
 368
 369 static void sh_mobile_ceu_videobuf_queue(struct vb2_buffer *vb)
 370 {
 371         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
 372         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 373         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 374         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb);
 375         unsigned long size;
 376         int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 377                                                 icd->current_fmt->host_fmt);
 378
 379         if (bytes_per_line < 0)
 380                 goto error;
 381
 382         size = icd->user_height * bytes_per_line;
 383
 384         if (vb2_plane_size(vb, 0) < size) {
 385                 dev_err(icd->parent, "Buffer #%d too small (%lu < %lu)\n",
 386                         vb->v4l2_buf.index, vb2_plane_size(vb, 0), size);
 387                 goto error;
 388         }
 389
 390         vb2_set_plane_payload(vb, 0, size);
 391
 392         dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
 393                 vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
 394
 395 #ifdef DEBUG
 396         /*
 397          * This can be useful if you want to see if we actually fill
 398          * the buffer with something
 399          */
 400         if (vb2_plane_vaddr(vb, 0))
 401                 memset(vb2_plane_vaddr(vb, 0), 0xaa, vb2_get_plane_payload(vb, 0));
 402 #endif
 403
 404         spin_lock_irq(&pcdev->lock);
 405         list_add_tail(&buf->queue, &pcdev->capture);
 406
 407         if (!pcdev->active) {
 408                 /*
 409                  * Because there were no active buffer at this moment,
 410                  * we are not interested in the return value of
 411                  * sh_mobile_ceu_capture here.
 412                  */
 413                 pcdev->active = vb;
 414                 sh_mobile_ceu_capture(pcdev);
 415         }
 416         spin_unlock_irq(&pcdev->lock);
 417
 418         return;
 419
 420 error:
 421         vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
 422 }
 423
 424 static void sh_mobile_ceu_videobuf_release(struct vb2_buffer *vb)
 425 {
 426         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
 427         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 428         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb);
 429         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 430
 431         spin_lock_irq(&pcdev->lock);
 432
 433         if (pcdev->active == vb) {
 434                 /* disable capture (release DMA buffer), reset */
 435                 ceu_write(pcdev, CAPSR, 1 << 16);
 436                 pcdev->active = NULL;
 437         }
 438
 439         /*
 440          * Doesn't hurt also if the list is empty, but it hurts, if queuing the
 441          * buffer failed, and .buf_init() hasn't been called
 442          */
 443         if (buf->queue.next)
 444                 list_del_init(&buf->queue);
 445
 446         pcdev->buf_total -= PAGE_ALIGN(vb2_plane_size(vb, 0));
 447         dev_dbg(icd->parent, "%s() %zu bytes buffers\n", __func__,
 448                 pcdev->buf_total);
 449
 450         spin_unlock_irq(&pcdev->lock);
 451 }
 452
 453 static int sh_mobile_ceu_videobuf_init(struct vb2_buffer *vb)
 454 {
 455         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
 456         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 457         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 458
 459         pcdev->buf_total += PAGE_ALIGN(vb2_plane_size(vb, 0));
 460         dev_dbg(icd->parent, "%s() %zu bytes buffers\n", __func__,
 461                 pcdev->buf_total);
 462
 463         /* This is for locking debugging only */
 464         INIT_LIST_HEAD(&to_ceu_vb(vb)->queue);
 465         return 0;
 466 }
 467
 468 static int sh_mobile_ceu_stop_streaming(struct vb2_queue *q)
 469 {
 470         struct soc_camera_device *icd = container_of(q, struct soc_camera_device, vb2_vidq);
 471         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 472         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 473         struct list_head *buf_head, *tmp;
 474
 475         spin_lock_irq(&pcdev->lock);
 476
 477         pcdev->active = NULL;
 478
 479         list_for_each_safe(buf_head, tmp, &pcdev->capture)
 480                 list_del_init(buf_head);
 481
 482         spin_unlock_irq(&pcdev->lock);
 483
 484         return sh_mobile_ceu_soft_reset(pcdev);
 485 }
 486
 487 static struct vb2_ops sh_mobile_ceu_videobuf_ops = {
 488         .queue_setup    = sh_mobile_ceu_videobuf_setup,
 489         .buf_prepare    = sh_mobile_ceu_videobuf_prepare,
 490         .buf_queue      = sh_mobile_ceu_videobuf_queue,
 491         .buf_cleanup    = sh_mobile_ceu_videobuf_release,
 492         .buf_init       = sh_mobile_ceu_videobuf_init,
 493         .wait_prepare   = soc_camera_unlock,
 494         .wait_finish    = soc_camera_lock,
 495         .stop_streaming = sh_mobile_ceu_stop_streaming,
 496 };
 497
 498 static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
 499 {
 500         struct sh_mobile_ceu_dev *pcdev = data;
 501         struct vb2_buffer *vb;
 502         int ret;
 503
 504         spin_lock(&pcdev->lock);
 505
 506         vb = pcdev->active;
 507         if (!vb)
 508                 /* Stale interrupt from a released buffer */
 509                 goto out;
 510
 511         list_del_init(&to_ceu_vb(vb)->queue);
 512
 513         if (!list_empty(&pcdev->capture))
 514                 pcdev->active = &list_entry(pcdev->capture.next,
 515                                             struct sh_mobile_ceu_buffer, queue)->vb;
 516         else
 517                 pcdev->active = NULL;
 518
 519         ret = sh_mobile_ceu_capture(pcdev);
 520         do_gettimeofday(&vb->v4l2_buf.timestamp);
 521         if (!ret) {
 522                 vb->v4l2_buf.field = pcdev->field;
 523                 vb->v4l2_buf.sequence = pcdev->sequence++;
 524         }
 525         vb2_buffer_done(vb, ret < 0 ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 526
 527 out:
 528         spin_unlock(&pcdev->lock);
 529
 530         return IRQ_HANDLED;
 531 }
 532
 533 static struct v4l2_subdev *find_csi2(struct sh_mobile_ceu_dev *pcdev)
 534 {
 535         struct v4l2_subdev *sd;
 536
 537         if (!pcdev->csi2_pdev)
 538                 return NULL;
 539
 540         v4l2_device_for_each_subdev(sd, &pcdev->ici.v4l2_dev)
 541                 if (&pcdev->csi2_pdev->dev == v4l2_get_subdevdata(sd))
 542                         return sd;
 543
 544         return NULL;
 545 }
 546
 547 /* Called with .video_lock held */
 548 static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
 549 {
 550         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 551         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 552         struct v4l2_subdev *csi2_sd;
 553         int ret;
 554
 555         if (pcdev->icd)
 556                 return -EBUSY;
 557
 558         dev_info(icd->parent,
 559                  "SuperH Mobile CEU driver attached to camera %d\n",
 560                  icd->devnum);
 561
 562         pm_runtime_get_sync(ici->v4l2_dev.dev);
 563
 564         pcdev->buf_total = 0;
 565
 566         ret = sh_mobile_ceu_soft_reset(pcdev);
 567
 568         csi2_sd = find_csi2(pcdev);
 569         if (csi2_sd)
 570                 csi2_sd->grp_id = (long)icd;
 571
 572         ret = v4l2_subdev_call(csi2_sd, core, s_power, 1);
 573         if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV) {
 574                 pm_runtime_put_sync(ici->v4l2_dev.dev);
 575                 return ret;
 576         }
 577
 578         /*
 579          * -ENODEV is special: either csi2_sd == NULL or the CSI-2 driver
 580          * has not found this soc-camera device among its clients
 581          */
 582         if (ret == -ENODEV && csi2_sd)
 583                 csi2_sd->grp_id = 0;
 584         pcdev->icd = icd;
 585
 586         return 0;
 587 }
 588
 589 /* Called with .video_lock held */
 590 static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
 591 {
 592         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 593         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 594         struct v4l2_subdev *csi2_sd = find_csi2(pcdev);
 595
 596         BUG_ON(icd != pcdev->icd);
 597
 598         v4l2_subdev_call(csi2_sd, core, s_power, 0);
 599         if (csi2_sd)
 600                 csi2_sd->grp_id = 0;
 601         /* disable capture, disable interrupts */
 602         ceu_write(pcdev, CEIER, 0);
 603         sh_mobile_ceu_soft_reset(pcdev);
 604
 605         /* make sure active buffer is canceled */
 606         spin_lock_irq(&pcdev->lock);
 607         if (pcdev->active) {
 608                 list_del_init(&to_ceu_vb(pcdev->active)->queue);
 609                 vb2_buffer_done(pcdev->active, VB2_BUF_STATE_ERROR);
 610                 pcdev->active = NULL;
 611         }
 612         spin_unlock_irq(&pcdev->lock);
 613
 614         pm_runtime_put_sync(ici->v4l2_dev.dev);
 615
 616         dev_info(icd->parent,
 617                  "SuperH Mobile CEU driver detached from camera %d\n",
 618                  icd->devnum);
 619
 620         pcdev->icd = NULL;
 621 }
 622
 623 /*
 624  * See chapter 29.4.12 "Capture Filter Control Register (CFLCR)"
 625  * in SH7722 Hardware Manual
 626  */
 627 static unsigned int size_dst(unsigned int src, unsigned int scale)
 628 {
 629         unsigned int mant_pre = scale >> 12;
 630         if (!src || !scale)
 631                 return src;
 632         return ((mant_pre + 2 * (src - 1)) / (2 * mant_pre) - 1) *
 633                 mant_pre * 4096 / scale + 1;
 634 }
 635
 636 static u16 calc_scale(unsigned int src, unsigned int *dst)
 637 {
 638         u16 scale;
 639
 640         if (src == *dst)
 641                 return 0;
 642
 643         scale = (src * 4096 / *dst) & ~7;
 644
 645         while (scale > 4096 && size_dst(src, scale) < *dst)
 646                 scale -= 8;
 647
 648         *dst = size_dst(src, scale);
 649
 650         return scale;
 651 }
 652
 653 /* rect is guaranteed to not exceed the scaled camera rectangle */
 654 static void sh_mobile_ceu_set_rect(struct soc_camera_device *icd)
 655 {
 656         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 657         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 658         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 659         unsigned int height, width, cdwdr_width, in_width, in_height;
 660         unsigned int left_offset, top_offset;
 661         u32 camor;
 662
 663         dev_geo(icd->parent, "Crop %ux%u@%u:%u\n",
 664                 icd->user_width, icd->user_height, cam->ceu_left, cam->ceu_top);
 665
 666         left_offset     = cam->ceu_left;
 667         top_offset      = cam->ceu_top;
 668
 669         WARN_ON(icd->user_width & 3 || icd->user_height & 3);
 670
 671         width = icd->user_width;
 672
 673         if (pcdev->image_mode) {
 674                 in_width = cam->width;
 675                 if (!pcdev->is_16bit) {
 676                         in_width *= 2;
 677                         left_offset *= 2;
 678                 }
 679                 cdwdr_width = width;
 680         } else {
 681                 int bytes_per_line = soc_mbus_bytes_per_line(width,
 682                                                 icd->current_fmt->host_fmt);
 683                 unsigned int w_factor;
 684
 685                 switch (icd->current_fmt->host_fmt->packing) {
 686                 case SOC_MBUS_PACKING_2X8_PADHI:
 687                         w_factor = 2;
 688                         break;
 689                 default:
 690                         w_factor = 1;
 691                 }
 692
 693                 in_width = cam->width * w_factor;
 694                 left_offset *= w_factor;
 695
 696                 if (bytes_per_line < 0)
 697                         cdwdr_width = width;
 698                 else
 699                         cdwdr_width = bytes_per_line;
 700         }
 701
 702         height = icd->user_height;
 703         in_height = cam->height;
 704         if (V4L2_FIELD_NONE != pcdev->field) {
 705                 height = (height / 2) & ~3;
 706                 in_height /= 2;
 707                 top_offset /= 2;
 708                 cdwdr_width *= 2;
 709         }
 710
 711         /* CSI2 special configuration */
 712         if (pcdev->pdata->csi2) {
 713                 in_width = ((in_width - 2) * 2);
 714                 left_offset *= 2;
 715         }
 716
 717         /* Set CAMOR, CAPWR, CFSZR, take care of CDWDR */
 718         camor = left_offset | (top_offset << 16);
 719
 720         dev_geo(icd->parent,
 721                 "CAMOR 0x%x, CAPWR 0x%x, CFSZR 0x%x, CDWDR 0x%x\n", camor,
 722                 (in_height << 16) | in_width, (height << 16) | width,
 723                 cdwdr_width);
 724
 725         ceu_write(pcdev, CAMOR, camor);
 726         ceu_write(pcdev, CAPWR, (in_height << 16) | in_width);
 727         /* CFSZR clipping is applied _after_ the scaling filter (CFLCR) */
 728         ceu_write(pcdev, CFSZR, (height << 16) | width);
 729         ceu_write(pcdev, CDWDR, cdwdr_width);
 730 }
 731
 732 static u32 capture_save_reset(struct sh_mobile_ceu_dev *pcdev)
 733 {
 734         u32 capsr = ceu_read(pcdev, CAPSR);
 735         ceu_write(pcdev, CAPSR, 1 << 16); /* reset, stop capture */
 736         return capsr;
 737 }
 738
 739 static void capture_restore(struct sh_mobile_ceu_dev *pcdev, u32 capsr)
 740 {
 741         unsigned long timeout = jiffies + 10 * HZ;
 742
 743         /*
 744          * Wait until the end of the current frame. It can take a long time,
 745          * but if it has been aborted by a CAPSR reset, it shoule exit sooner.
 746          */
 747         while ((ceu_read(pcdev, CSTSR) & 1) && time_before(jiffies, timeout))
 748                 msleep(1);
 749
 750         if (time_after(jiffies, timeout)) {
 751                 dev_err(pcdev->ici.v4l2_dev.dev,
 752                         "Timeout waiting for frame end! Interface problem?\n");
 753                 return;
 754         }
 755
 756         /* Wait until reset clears, this shall not hang... */
 757         while (ceu_read(pcdev, CAPSR) & (1 << 16))
 758                 udelay(10);
 759
 760         /* Anything to restore? */
 761         if (capsr & ~(1 << 16))
 762                 ceu_write(pcdev, CAPSR, capsr);
 763 }
 764
 765 /* Find the bus subdevice driver, e.g., CSI2 */
 766 static struct v4l2_subdev *find_bus_subdev(struct sh_mobile_ceu_dev *pcdev,
 767                                            struct soc_camera_device *icd)
 768 {
 769         if (pcdev->csi2_pdev) {
 770                 struct v4l2_subdev *csi2_sd = find_csi2(pcdev);
 771                 if (csi2_sd && csi2_sd->grp_id == (u32)icd)
 772                         return csi2_sd;
 773         }
 774
 775         return soc_camera_to_subdev(icd);
 776 }
 777
 778 #define CEU_BUS_FLAGS (V4L2_MBUS_MASTER |       \
 779                 V4L2_MBUS_PCLK_SAMPLE_RISING |  \
 780                 V4L2_MBUS_HSYNC_ACTIVE_HIGH |   \
 781                 V4L2_MBUS_HSYNC_ACTIVE_LOW |    \
 782                 V4L2_MBUS_VSYNC_ACTIVE_HIGH |   \
 783                 V4L2_MBUS_VSYNC_ACTIVE_LOW |    \
 784                 V4L2_MBUS_DATA_ACTIVE_HIGH)
 785
 786 /* Capture is not running, no interrupts, no locking needed */
 787 static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
 788                                        __u32 pixfmt)
 789 {
 790         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 791         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 792         struct v4l2_subdev *sd = find_bus_subdev(pcdev, icd);
 793         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 794         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
 795         unsigned long value, common_flags = CEU_BUS_FLAGS;
 796         u32 capsr = capture_save_reset(pcdev);
 797         unsigned int yuv_lineskip;
 798         int ret;
 799
 800         /*
 801          * If the client doesn't implement g_mbus_config, we just use our
 802          * platform data
 803          */
 804         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
 805         if (!ret) {
 806                 common_flags = soc_mbus_config_compatible(&cfg,
 807                                                           common_flags);
 808                 if (!common_flags)
 809                         return -EINVAL;
 810         } else if (ret != -ENOIOCTLCMD) {
 811                 return ret;
 812         }
 813
 814         /* Make choises, based on platform preferences */
 815         if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
 816             (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
 817                 if (pcdev->pdata->flags & SH_CEU_FLAG_HSYNC_LOW)
 818                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
 819                 else
 820                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
 821         }
 822
 823         if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
 824             (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
 825                 if (pcdev->pdata->flags & SH_CEU_FLAG_VSYNC_LOW)
 826                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
 827                 else
 828                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
 829         }
 830
 831         cfg.flags = common_flags;
 832         ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
 833         if (ret < 0 && ret != -ENOIOCTLCMD)
 834                 return ret;
 835
 836         if (icd->current_fmt->host_fmt->bits_per_sample > 8)
 837                 pcdev->is_16bit = 1;
 838         else
 839                 pcdev->is_16bit = 0;
 840
 841         ceu_write(pcdev, CRCNTR, 0);
 842         ceu_write(pcdev, CRCMPR, 0);
 843
 844         value = 0x00000010; /* data fetch by default */
 845         yuv_lineskip = 0x10;
 846
 847         switch (icd->current_fmt->host_fmt->fourcc) {
 848         case V4L2_PIX_FMT_NV12:
 849         case V4L2_PIX_FMT_NV21:
 850                 /* convert 4:2:2 -> 4:2:0 */
 851                 yuv_lineskip = 0; /* skip for NV12/21, no skip for NV16/61 */
 852                 /* fall-through */
 853         case V4L2_PIX_FMT_NV16:
 854         case V4L2_PIX_FMT_NV61:
 855                 switch (cam->code) {
 856                 case V4L2_MBUS_FMT_UYVY8_2X8:
 857                         value = 0x00000000; /* Cb0, Y0, Cr0, Y1 */
 858                         break;
 859                 case V4L2_MBUS_FMT_VYUY8_2X8:
 860                         value = 0x00000100; /* Cr0, Y0, Cb0, Y1 */
 861                         break;
 862                 case V4L2_MBUS_FMT_YUYV8_2X8:
 863                         value = 0x00000200; /* Y0, Cb0, Y1, Cr0 */
 864                         break;
 865                 case V4L2_MBUS_FMT_YVYU8_2X8:
 866                         value = 0x00000300; /* Y0, Cr0, Y1, Cb0 */
 867                         break;
 868                 default:
 869                         BUG();
 870                 }
 871         }
 872
 873         if (icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV21 ||
 874             icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV61)
 875                 value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */
 876
 877         value |= common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
 878         value |= common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
 879         value |= pcdev->is_16bit ? 1 << 12 : 0;
 880
 881         /* CSI2 mode */
 882         if (pcdev->pdata->csi2)
 883                 value |= 3 << 12;
 884
 885         ceu_write(pcdev, CAMCR, value);
 886
 887         ceu_write(pcdev, CAPCR, 0x00300000);
 888
 889         switch (pcdev->field) {
 890         case V4L2_FIELD_INTERLACED_TB:
 891                 value = 0x101;
 892                 break;
 893         case V4L2_FIELD_INTERLACED_BT:
 894                 value = 0x102;
 895                 break;
 896         default:
 897                 value = 0;
 898                 break;
 899         }
 900         ceu_write(pcdev, CAIFR, value);
 901
 902         sh_mobile_ceu_set_rect(icd);
 903         mdelay(1);
 904
 905         dev_geo(icd->parent, "CFLCR 0x%x\n", pcdev->cflcr);
 906         ceu_write(pcdev, CFLCR, pcdev->cflcr);
 907
 908         /*
 909          * A few words about byte order (observed in Big Endian mode)
 910          *
 911          * In data fetch mode bytes are received in chunks of 8 bytes.
 912          * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
 913          *
 914          * The data is however by default written to memory in reverse order:
 915          * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
 916          *
 917          * The lowest three bits of CDOCR allows us to do swapping,
 918          * using 7 we swap the data bytes to match the incoming order:
 919          * D0, D1, D2, D3, D4, D5, D6, D7
 920          */
 921         value = 0x00000007 | yuv_lineskip;
 922
 923         ceu_write(pcdev, CDOCR, value);
 924         ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
 925
 926         dev_dbg(icd->parent, "S_FMT successful for %c%c%c%c %ux%u\n",
 927                 pixfmt & 0xff, (pixfmt >> 8) & 0xff,
 928                 (pixfmt >> 16) & 0xff, (pixfmt >> 24) & 0xff,
 929                 icd->user_width, icd->user_height);
 930
 931         capture_restore(pcdev, capsr);
 932
 933         /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
 934         return 0;
 935 }
 936
 937 static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd,
 938                                        unsigned char buswidth)
 939 {
 940         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 941         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 942         struct v4l2_subdev *sd = find_bus_subdev(pcdev, icd);
 943         unsigned long common_flags = CEU_BUS_FLAGS;
 944         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
 945         int ret;
 946
 947         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
 948         if (!ret)
 949                 common_flags = soc_mbus_config_compatible(&cfg,
 950                                                           common_flags);
 951         else if (ret != -ENOIOCTLCMD)
 952                 return ret;
 953
 954         if (!common_flags || buswidth > 16)
 955                 return -EINVAL;
 956
 957         return 0;
 958 }
 959
 960 static const struct soc_mbus_pixelfmt sh_mobile_ceu_formats[] = {
 961         {
 962                 .fourcc                 = V4L2_PIX_FMT_NV12,
 963                 .name                   = "NV12",
 964                 .bits_per_sample        = 8,
 965                 .packing                = SOC_MBUS_PACKING_1_5X8,
 966                 .order                  = SOC_MBUS_ORDER_LE,
 967         }, {
 968                 .fourcc                 = V4L2_PIX_FMT_NV21,
 969                 .name                   = "NV21",
 970                 .bits_per_sample        = 8,
 971                 .packing                = SOC_MBUS_PACKING_1_5X8,
 972                 .order                  = SOC_MBUS_ORDER_LE,
 973         }, {
 974                 .fourcc                 = V4L2_PIX_FMT_NV16,
 975                 .name                   = "NV16",
 976                 .bits_per_sample        = 8,
 977                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
 978                 .order                  = SOC_MBUS_ORDER_LE,
 979         }, {
 980                 .fourcc                 = V4L2_PIX_FMT_NV61,
 981                 .name                   = "NV61",
 982                 .bits_per_sample        = 8,
 983                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
 984                 .order                  = SOC_MBUS_ORDER_LE,
 985         },
 986 };
 987
 988 /* This will be corrected as we get more formats */
 989 static bool sh_mobile_ceu_packing_supported(const struct soc_mbus_pixelfmt *fmt)
 990 {
 991         return  fmt->packing == SOC_MBUS_PACKING_NONE ||
 992                 (fmt->bits_per_sample == 8 &&
 993                  fmt->packing == SOC_MBUS_PACKING_1_5X8) ||
 994                 (fmt->bits_per_sample == 8 &&
 995                  fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
 996                 (fmt->bits_per_sample > 8 &&
 997                  fmt->packing == SOC_MBUS_PACKING_EXTEND16);
 998 }
 999
1000 static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect);
1001
1002 static struct soc_camera_device *ctrl_to_icd(struct v4l2_ctrl *ctrl)
1003 {
1004         return container_of(ctrl->handler, struct soc_camera_device,
1005                                                         ctrl_handler);
1006 }
1007
1008 static int sh_mobile_ceu_s_ctrl(struct v4l2_ctrl *ctrl)
1009 {
1010         struct soc_camera_device *icd = ctrl_to_icd(ctrl);
1011         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1012         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1013
1014         switch (ctrl->id) {
1015         case V4L2_CID_SHARPNESS:
1016                 switch (icd->current_fmt->host_fmt->fourcc) {
1017                 case V4L2_PIX_FMT_NV12:
1018                 case V4L2_PIX_FMT_NV21:
1019                 case V4L2_PIX_FMT_NV16:
1020                 case V4L2_PIX_FMT_NV61:
1021                         ceu_write(pcdev, CLFCR, !ctrl->val);
1022                         return 0;
1023                 }
1024                 break;
1025         }
1026
1027         return -EINVAL;
1028 }
1029
1030 static const struct v4l2_ctrl_ops sh_mobile_ceu_ctrl_ops = {
1031         .s_ctrl = sh_mobile_ceu_s_ctrl,
1032 };
1033
1034 static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, unsigned int idx,
1035                                      struct soc_camera_format_xlate *xlate)
1036 {
1037         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1038         struct device *dev = icd->parent;
1039         struct soc_camera_host *ici = to_soc_camera_host(dev);
1040         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1041         int ret, k, n;
1042         int formats = 0;
1043         struct sh_mobile_ceu_cam *cam;
1044         enum v4l2_mbus_pixelcode code;
1045         const struct soc_mbus_pixelfmt *fmt;
1046
1047         ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
1048         if (ret < 0)
1049                 /* No more formats */
1050                 return 0;
1051
1052         fmt = soc_mbus_get_fmtdesc(code);
1053         if (!fmt) {
1054                 dev_warn(dev, "unsupported format code #%u: %d\n", idx, code);
1055                 return 0;
1056         }
1057
1058         if (!pcdev->pdata->csi2) {
1059                 /* Are there any restrictions in the CSI-2 case? */
1060                 ret = sh_mobile_ceu_try_bus_param(icd, fmt->bits_per_sample);
1061                 if (ret < 0)
1062                         return 0;
1063         }
1064
1065         if (!icd->host_priv) {
1066                 struct v4l2_mbus_framefmt mf;
1067                 struct v4l2_rect rect;
1068                 int shift = 0;
1069
1070                 /* Add our control */
1071                 v4l2_ctrl_new_std(&icd->ctrl_handler, &sh_mobile_ceu_ctrl_ops,
1072                                   V4L2_CID_SHARPNESS, 0, 1, 1, 0);
1073                 if (icd->ctrl_handler.error)
1074                         return icd->ctrl_handler.error;
1075
1076                 /* FIXME: subwindow is lost between close / open */
1077
1078                 /* Cache current client geometry */
1079                 ret = client_g_rect(sd, &rect);
1080                 if (ret < 0)
1081                         return ret;
1082
1083                 /* First time */
1084                 ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
1085                 if (ret < 0)
1086                         return ret;
1087
1088                 while ((mf.width > 2560 || mf.height > 1920) && shift < 4) {
1089                         /* Try 2560x1920, 1280x960, 640x480, 320x240 */
1090                         mf.width        = 2560 >> shift;
1091                         mf.height       = 1920 >> shift;
1092                         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
1093                                                          s_mbus_fmt, &mf);
1094                         if (ret < 0)
1095                                 return ret;
1096                         shift++;
1097                 }
1098
1099                 if (shift == 4) {
1100                         dev_err(dev, "Failed to configure the client below %ux%x\n",
1101                                 mf.width, mf.height);
1102                         return -EIO;
1103                 }
1104
1105                 dev_geo(dev, "camera fmt %ux%u\n", mf.width, mf.height);
1106
1107                 cam = kzalloc(sizeof(*cam), GFP_KERNEL);
1108                 if (!cam)
1109                         return -ENOMEM;
1110
1111                 /* We are called with current camera crop, initialise subrect with it */
1112                 cam->rect       = rect;
1113                 cam->subrect    = rect;
1114
1115                 cam->width      = mf.width;
1116                 cam->height     = mf.height;
1117
1118                 icd->host_priv = cam;
1119         } else {
1120                 cam = icd->host_priv;
1121         }
1122
1123         /* Beginning of a pass */
1124         if (!idx)
1125                 cam->extra_fmt = NULL;
1126
1127         switch (code) {
1128         case V4L2_MBUS_FMT_UYVY8_2X8:
1129         case V4L2_MBUS_FMT_VYUY8_2X8:
1130         case V4L2_MBUS_FMT_YUYV8_2X8:
1131         case V4L2_MBUS_FMT_YVYU8_2X8:
1132                 if (cam->extra_fmt)
1133                         break;
1134
1135                 /*
1136                  * Our case is simple so far: for any of the above four camera
1137                  * formats we add all our four synthesized NV* formats, so,
1138                  * just marking the device with a single flag suffices. If
1139                  * the format generation rules are more complex, you would have
1140                  * to actually hang your already added / counted formats onto
1141                  * the host_priv pointer and check whether the format you're
1142                  * going to add now is already there.
1143                  */
1144                 cam->extra_fmt = sh_mobile_ceu_formats;
1145
1146                 n = ARRAY_SIZE(sh_mobile_ceu_formats);
1147                 formats += n;
1148                 for (k = 0; xlate && k < n; k++) {
1149                         xlate->host_fmt = &sh_mobile_ceu_formats[k];
1150                         xlate->code     = code;
1151                         xlate++;
1152                         dev_dbg(dev, "Providing format %s using code %d\n",
1153                                 sh_mobile_ceu_formats[k].name, code);
1154                 }
1155                 break;
1156         default:
1157                 if (!sh_mobile_ceu_packing_supported(fmt))
1158                         return 0;
1159         }
1160
1161         /* Generic pass-through */
1162         formats++;
1163         if (xlate) {
1164                 xlate->host_fmt = fmt;
1165                 xlate->code     = code;
1166                 xlate++;
1167                 dev_dbg(dev, "Providing format %s in pass-through mode\n",
1168                         fmt->name);
1169         }
1170
1171         return formats;
1172 }
1173
1174 static void sh_mobile_ceu_put_formats(struct soc_camera_device *icd)
1175 {
1176         kfree(icd->host_priv);
1177         icd->host_priv = NULL;
1178 }
1179
1180 /* Check if any dimension of r1 is smaller than respective one of r2 */
1181 static bool is_smaller(struct v4l2_rect *r1, struct v4l2_rect *r2)
1182 {
1183         return r1->width < r2->width || r1->height < r2->height;
1184 }
1185
1186 /* Check if r1 fails to cover r2 */
1187 static bool is_inside(struct v4l2_rect *r1, struct v4l2_rect *r2)
1188 {
1189         return r1->left > r2->left || r1->top > r2->top ||
1190                 r1->left + r1->width < r2->left + r2->width ||
1191                 r1->top + r1->height < r2->top + r2->height;
1192 }
1193
1194 static unsigned int scale_down(unsigned int size, unsigned int scale)
1195 {
1196         return (size * 4096 + scale / 2) / scale;
1197 }
1198
1199 static unsigned int calc_generic_scale(unsigned int input, unsigned int output)
1200 {
1201         return (input * 4096 + output / 2) / output;
1202 }
1203
1204 /* Get and store current client crop */
1205 static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect)
1206 {
1207         struct v4l2_crop crop;
1208         struct v4l2_cropcap cap;
1209         int ret;
1210
1211         crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1212
1213         ret = v4l2_subdev_call(sd, video, g_crop, &crop);
1214         if (!ret) {
1215                 *rect = crop.c;
1216                 return ret;
1217         }
1218
1219         /* Camera driver doesn't support .g_crop(), assume default rectangle */
1220         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1221
1222         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1223         if (!ret)
1224                 *rect = cap.defrect;
1225
1226         return ret;
1227 }
1228
1229 /* Client crop has changed, update our sub-rectangle to remain within the area */
1230 static void update_subrect(struct sh_mobile_ceu_cam *cam)
1231 {
1232         struct v4l2_rect *rect = &cam->rect, *subrect = &cam->subrect;
1233
1234         if (rect->width < subrect->width)
1235                 subrect->width = rect->width;
1236
1237         if (rect->height < subrect->height)
1238                 subrect->height = rect->height;
1239
1240         if (rect->left > subrect->left)
1241                 subrect->left = rect->left;
1242         else if (rect->left + rect->width >
1243                  subrect->left + subrect->width)
1244                 subrect->left = rect->left + rect->width -
1245                         subrect->width;
1246
1247         if (rect->top > subrect->top)
1248                 subrect->top = rect->top;
1249         else if (rect->top + rect->height >
1250                  subrect->top + subrect->height)
1251                 subrect->top = rect->top + rect->height -
1252                         subrect->height;
1253 }
1254
1255 /*
1256  * The common for both scaling and cropping iterative approach is:
1257  * 1. try if the client can produce exactly what requested by the user
1258  * 2. if (1) failed, try to double the client image until we get one big enough
1259  * 3. if (2) failed, try to request the maximum image
1260  */
1261 static int client_s_crop(struct soc_camera_device *icd, struct v4l2_crop *crop,
1262                          struct v4l2_crop *cam_crop)
1263 {
1264         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1265         struct v4l2_rect *rect = &crop->c, *cam_rect = &cam_crop->c;
1266         struct device *dev = sd->v4l2_dev->dev;
1267         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1268         struct v4l2_cropcap cap;
1269         int ret;
1270         unsigned int width, height;
1271
1272         v4l2_subdev_call(sd, video, s_crop, crop);
1273         ret = client_g_rect(sd, cam_rect);
1274         if (ret < 0)
1275                 return ret;
1276
1277         /*
1278          * Now cam_crop contains the current camera input rectangle, and it must
1279          * be within camera cropcap bounds
1280          */
1281         if (!memcmp(rect, cam_rect, sizeof(*rect))) {
1282                 /* Even if camera S_CROP failed, but camera rectangle matches */
1283                 dev_dbg(dev, "Camera S_CROP successful for %dx%d@%d:%d\n",
1284                         rect->width, rect->height, rect->left, rect->top);
1285                 cam->rect = *cam_rect;
1286                 return 0;
1287         }
1288
1289         /* Try to fix cropping, that camera hasn't managed to set */
1290         dev_geo(dev, "Fix camera S_CROP for %dx%d@%d:%d to %dx%d@%d:%d\n",
1291                 cam_rect->width, cam_rect->height,
1292                 cam_rect->left, cam_rect->top,
1293                 rect->width, rect->height, rect->left, rect->top);
1294
1295         /* We need sensor maximum rectangle */
1296         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1297         if (ret < 0)
1298                 return ret;
1299
1300         /* Put user requested rectangle within sensor bounds */
1301         soc_camera_limit_side(&rect->left, &rect->width, cap.bounds.left, 2,
1302                               cap.bounds.width);
1303         soc_camera_limit_side(&rect->top, &rect->height, cap.bounds.top, 4,
1304                               cap.bounds.height);
1305
1306         /*
1307          * Popular special case - some cameras can only handle fixed sizes like
1308          * QVGA, VGA,... Take care to avoid infinite loop.
1309          */
1310         width = max(cam_rect->width, 2);
1311         height = max(cam_rect->height, 2);
1312
1313         /*
1314          * Loop as long as sensor is not covering the requested rectangle and
1315          * is still within its bounds
1316          */
1317         while (!ret && (is_smaller(cam_rect, rect) ||
1318                         is_inside(cam_rect, rect)) &&
1319                (cap.bounds.width > width || cap.bounds.height > height)) {
1320
1321                 width *= 2;
1322                 height *= 2;
1323
1324                 cam_rect->width = width;
1325                 cam_rect->height = height;
1326
1327                 /*
1328                  * We do not know what capabilities the camera has to set up
1329                  * left and top borders. We could try to be smarter in iterating
1330                  * them, e.g., if camera current left is to the right of the
1331                  * target left, set it to the middle point between the current
1332                  * left and minimum left. But that would add too much
1333                  * complexity: we would have to iterate each border separately.
1334                  * Instead we just drop to the left and top bounds.
1335                  */
1336                 if (cam_rect->left > rect->left)
1337                         cam_rect->left = cap.bounds.left;
1338
1339                 if (cam_rect->left + cam_rect->width < rect->left + rect->width)
1340                         cam_rect->width = rect->left + rect->width -
1341                                 cam_rect->left;
1342
1343                 if (cam_rect->top > rect->top)
1344                         cam_rect->top = cap.bounds.top;
1345
1346                 if (cam_rect->top + cam_rect->height < rect->top + rect->height)
1347                         cam_rect->height = rect->top + rect->height -
1348                                 cam_rect->top;
1349
1350                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1351                 ret = client_g_rect(sd, cam_rect);
1352                 dev_geo(dev, "Camera S_CROP %d for %dx%d@%d:%d\n", ret,
1353                         cam_rect->width, cam_rect->height,
1354                         cam_rect->left, cam_rect->top);
1355         }
1356
1357         /* S_CROP must not modify the rectangle */
1358         if (is_smaller(cam_rect, rect) || is_inside(cam_rect, rect)) {
1359                 /*
1360                  * The camera failed to configure a suitable cropping,
1361                  * we cannot use the current rectangle, set to max
1362                  */
1363                 *cam_rect = cap.bounds;
1364                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1365                 ret = client_g_rect(sd, cam_rect);
1366                 dev_geo(dev, "Camera S_CROP %d for max %dx%d@%d:%d\n", ret,
1367                         cam_rect->width, cam_rect->height,
1368                         cam_rect->left, cam_rect->top);
1369         }
1370
1371         if (!ret) {
1372                 cam->rect = *cam_rect;
1373                 update_subrect(cam);
1374         }
1375
1376         return ret;
1377 }
1378
1379 /* Iterative s_mbus_fmt, also updates cached client crop on success */
1380 static int client_s_fmt(struct soc_camera_device *icd,
1381                         struct v4l2_mbus_framefmt *mf, bool ceu_can_scale)
1382 {
1383         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1384         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1385         struct device *dev = icd->parent;
1386         unsigned int width = mf->width, height = mf->height, tmp_w, tmp_h;
1387         unsigned int max_width, max_height;
1388         struct v4l2_cropcap cap;
1389         bool ceu_1to1;
1390         int ret;
1391
1392         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
1393                                          s_mbus_fmt, mf);
1394         if (ret < 0)
1395                 return ret;
1396
1397         dev_geo(dev, "camera scaled to %ux%u\n", mf->width, mf->height);
1398
1399         if (width == mf->width && height == mf->height) {
1400                 /* Perfect! The client has done it all. */
1401                 ceu_1to1 = true;
1402                 goto update_cache;
1403         }
1404
1405         ceu_1to1 = false;
1406         if (!ceu_can_scale)
1407                 goto update_cache;
1408
1409         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1410
1411         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1412         if (ret < 0)
1413                 return ret;
1414
1415         max_width = min(cap.bounds.width, 2560);
1416         max_height = min(cap.bounds.height, 1920);
1417
1418         /* Camera set a format, but geometry is not precise, try to improve */
1419         tmp_w = mf->width;
1420         tmp_h = mf->height;
1421
1422         /* width <= max_width && height <= max_height - guaranteed by try_fmt */
1423         while ((width > tmp_w || height > tmp_h) &&
1424                tmp_w < max_width && tmp_h < max_height) {
1425                 tmp_w = min(2 * tmp_w, max_width);
1426                 tmp_h = min(2 * tmp_h, max_height);
1427                 mf->width = tmp_w;
1428                 mf->height = tmp_h;
1429                 ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
1430                                                  s_mbus_fmt, mf);
1431                 dev_geo(dev, "Camera scaled to %ux%u\n",
1432                         mf->width, mf->height);
1433                 if (ret < 0) {
1434                         /* This shouldn't happen */
1435                         dev_err(dev, "Client failed to set format: %d\n", ret);
1436                         return ret;
1437                 }
1438         }
1439
1440 update_cache:
1441         /* Update cache */
1442         ret = client_g_rect(sd, &cam->rect);
1443         if (ret < 0)
1444                 return ret;
1445
1446         if (ceu_1to1)
1447                 cam->subrect = cam->rect;
1448         else
1449                 update_subrect(cam);
1450
1451         return 0;
1452 }
1453
1454 /**
1455  * @width       - on output: user width, mapped back to input
1456  * @height      - on output: user height, mapped back to input
1457  * @mf          - in- / output camera output window
1458  */
1459 static int client_scale(struct soc_camera_device *icd,
1460                         struct v4l2_mbus_framefmt *mf,
1461                         unsigned int *width, unsigned int *height,
1462                         bool ceu_can_scale)
1463 {
1464         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1465         struct device *dev = icd->parent;
1466         struct v4l2_mbus_framefmt mf_tmp = *mf;
1467         unsigned int scale_h, scale_v;
1468         int ret;
1469
1470         /*
1471          * 5. Apply iterative camera S_FMT for camera user window (also updates
1472          *    client crop cache and the imaginary sub-rectangle).
1473          */
1474         ret = client_s_fmt(icd, &mf_tmp, ceu_can_scale);
1475         if (ret < 0)
1476                 return ret;
1477
1478         dev_geo(dev, "5: camera scaled to %ux%u\n",
1479                 mf_tmp.width, mf_tmp.height);
1480
1481         /* 6. Retrieve camera output window (g_fmt) */
1482
1483         /* unneeded - it is already in "mf_tmp" */
1484
1485         /* 7. Calculate new client scales. */
1486         scale_h = calc_generic_scale(cam->rect.width, mf_tmp.width);
1487         scale_v = calc_generic_scale(cam->rect.height, mf_tmp.height);
1488
1489         mf->width       = mf_tmp.width;
1490         mf->height      = mf_tmp.height;
1491         mf->colorspace  = mf_tmp.colorspace;
1492
1493         /*
1494          * 8. Calculate new CEU crop - apply camera scales to previously
1495          *    updated "effective" crop.
1496          */
1497         *width = scale_down(cam->subrect.width, scale_h);
1498         *height = scale_down(cam->subrect.height, scale_v);
1499
1500         dev_geo(dev, "8: new client sub-window %ux%u\n", *width, *height);
1501
1502         return 0;
1503 }
1504
1505 /*
1506  * CEU can scale and crop, but we don't want to waste bandwidth and kill the
1507  * framerate by always requesting the maximum image from the client. See
1508  * Documentation/video4linux/sh_mobile_ceu_camera.txt for a description of
1509  * scaling and cropping algorithms and for the meaning of referenced here steps.
1510  */
1511 static int sh_mobile_ceu_set_crop(struct soc_camera_device *icd,
1512                                   struct v4l2_crop *a)
1513 {
1514         struct v4l2_rect *rect = &a->c;
1515         struct device *dev = icd->parent;
1516         struct soc_camera_host *ici = to_soc_camera_host(dev);
1517         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1518         struct v4l2_crop cam_crop;
1519         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1520         struct v4l2_rect *cam_rect = &cam_crop.c;
1521         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1522         struct v4l2_mbus_framefmt mf;
1523         unsigned int scale_cam_h, scale_cam_v, scale_ceu_h, scale_ceu_v,
1524                 out_width, out_height;
1525         int interm_width, interm_height;
1526         u32 capsr, cflcr;
1527         int ret;
1528
1529         dev_geo(dev, "S_CROP(%ux%u@%u:%u)\n", rect->width, rect->height,
1530                 rect->left, rect->top);
1531
1532         /* During camera cropping its output window can change too, stop CEU */
1533         capsr = capture_save_reset(pcdev);
1534         dev_dbg(dev, "CAPSR 0x%x, CFLCR 0x%x\n", capsr, pcdev->cflcr);
1535
1536         /*
1537          * 1. - 2. Apply iterative camera S_CROP for new input window, read back
1538          * actual camera rectangle.
1539          */
1540         ret = client_s_crop(icd, a, &cam_crop);
1541         if (ret < 0)
1542                 return ret;
1543
1544         dev_geo(dev, "1-2: camera cropped to %ux%u@%u:%u\n",
1545                 cam_rect->width, cam_rect->height,
1546                 cam_rect->left, cam_rect->top);
1547
1548         /* On success cam_crop contains current camera crop */
1549
1550         /* 3. Retrieve camera output window */
1551         ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
1552         if (ret < 0)
1553                 return ret;
1554
1555         if (mf.width > 2560 || mf.height > 1920)
1556                 return -EINVAL;
1557
1558         /* 4. Calculate camera scales */
1559         scale_cam_h     = calc_generic_scale(cam_rect->width, mf.width);
1560         scale_cam_v     = calc_generic_scale(cam_rect->height, mf.height);
1561
1562         /* Calculate intermediate window */
1563         interm_width    = scale_down(rect->width, scale_cam_h);
1564         interm_height   = scale_down(rect->height, scale_cam_v);
1565
1566         if (interm_width < icd->user_width) {
1567                 u32 new_scale_h;
1568
1569                 new_scale_h = calc_generic_scale(rect->width, icd->user_width);
1570
1571                 mf.width = scale_down(cam_rect->width, new_scale_h);
1572         }
1573
1574         if (interm_height < icd->user_height) {
1575                 u32 new_scale_v;
1576
1577                 new_scale_v = calc_generic_scale(rect->height, icd->user_height);
1578
1579                 mf.height = scale_down(cam_rect->height, new_scale_v);
1580         }
1581
1582         if (interm_width < icd->user_width || interm_height < icd->user_height) {
1583                 ret = v4l2_device_call_until_err(sd->v4l2_dev, (int)icd, video,
1584                                                  s_mbus_fmt, &mf);
1585                 if (ret < 0)
1586                         return ret;
1587
1588                 dev_geo(dev, "New camera output %ux%u\n", mf.width, mf.height);
1589                 scale_cam_h     = calc_generic_scale(cam_rect->width, mf.width);
1590                 scale_cam_v     = calc_generic_scale(cam_rect->height, mf.height);
1591                 interm_width    = scale_down(rect->width, scale_cam_h);
1592                 interm_height   = scale_down(rect->height, scale_cam_v);
1593         }
1594
1595         /* Cache camera output window */
1596         cam->width      = mf.width;
1597         cam->height     = mf.height;
1598
1599         if (pcdev->image_mode) {
1600                 out_width       = min(interm_width, icd->user_width);
1601                 out_height      = min(interm_height, icd->user_height);
1602         } else {
1603                 out_width       = interm_width;
1604                 out_height      = interm_height;
1605         }
1606
1607         /*
1608          * 5. Calculate CEU scales from camera scales from results of (5) and
1609          *    the user window
1610          */
1611         scale_ceu_h     = calc_scale(interm_width, &out_width);
1612         scale_ceu_v     = calc_scale(interm_height, &out_height);
1613
1614         dev_geo(dev, "5: CEU scales %u:%u\n", scale_ceu_h, scale_ceu_v);
1615
1616         /* Apply CEU scales. */
1617         cflcr = scale_ceu_h | (scale_ceu_v << 16);
1618         if (cflcr != pcdev->cflcr) {
1619                 pcdev->cflcr = cflcr;
1620                 ceu_write(pcdev, CFLCR, cflcr);
1621         }
1622
1623         icd->user_width  = out_width & ~3;
1624         icd->user_height = out_height & ~3;
1625         /* Offsets are applied at the CEU scaling filter input */
1626         cam->ceu_left    = scale_down(rect->left - cam_rect->left, scale_cam_h) & ~1;
1627         cam->ceu_top     = scale_down(rect->top - cam_rect->top, scale_cam_v) & ~1;
1628
1629         /* 6. Use CEU cropping to crop to the new window. */
1630         sh_mobile_ceu_set_rect(icd);
1631
1632         cam->subrect = *rect;
1633
1634         dev_geo(dev, "6: CEU cropped to %ux%u@%u:%u\n",
1635                 icd->user_width, icd->user_height,
1636                 cam->ceu_left, cam->ceu_top);
1637
1638         /* Restore capture. The CE bit can be cleared by the hardware */
1639         if (pcdev->active)
1640                 capsr |= 1;
1641         capture_restore(pcdev, capsr);
1642
1643         /* Even if only camera cropping succeeded */
1644         return ret;
1645 }
1646
1647 static int sh_mobile_ceu_get_crop(struct soc_camera_device *icd,
1648                                   struct v4l2_crop *a)
1649 {
1650         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1651
1652         a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1653         a->c = cam->subrect;
1654
1655         return 0;
1656 }
1657
1658 /*
1659  * Calculate real client output window by applying new scales to the current
1660  * client crop. New scales are calculated from the requested output format and
1661  * CEU crop, mapped backed onto the client input (subrect).
1662  */
1663 static void calculate_client_output(struct soc_camera_device *icd,
1664                 const struct v4l2_pix_format *pix, struct v4l2_mbus_framefmt *mf)
1665 {
1666         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1667         struct device *dev = icd->parent;
1668         struct v4l2_rect *cam_subrect = &cam->subrect;
1669         unsigned int scale_v, scale_h;
1670
1671         if (cam_subrect->width == cam->rect.width &&
1672             cam_subrect->height == cam->rect.height) {
1673                 /* No sub-cropping */
1674                 mf->width       = pix->width;
1675                 mf->height      = pix->height;
1676                 return;
1677         }
1678
1679         /* 1.-2. Current camera scales and subwin - cached. */
1680
1681         dev_geo(dev, "2: subwin %ux%u@%u:%u\n",
1682                 cam_subrect->width, cam_subrect->height,
1683                 cam_subrect->left, cam_subrect->top);
1684
1685         /*
1686          * 3. Calculate new combined scales from input sub-window to requested
1687          *    user window.
1688          */
1689
1690         /*
1691          * TODO: CEU cannot scale images larger than VGA to smaller than SubQCIF
1692          * (128x96) or larger than VGA
1693          */
1694         scale_h = calc_generic_scale(cam_subrect->width, pix->width);
1695         scale_v = calc_generic_scale(cam_subrect->height, pix->height);
1696
1697         dev_geo(dev, "3: scales %u:%u\n", scale_h, scale_v);
1698
1699         /*
1700          * 4. Calculate desired client output window by applying combined scales
1701          *    to client (real) input window.
1702          */
1703         mf->width       = scale_down(cam->rect.width, scale_h);
1704         mf->height      = scale_down(cam->rect.height, scale_v);
1705 }
1706
1707 /* Similar to set_crop multistage iterative algorithm */
1708 static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
1709                                  struct v4l2_format *f)
1710 {
1711         struct device *dev = icd->parent;
1712         struct soc_camera_host *ici = to_soc_camera_host(dev);
1713         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1714         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1715         struct v4l2_pix_format *pix = &f->fmt.pix;
1716         struct v4l2_mbus_framefmt mf;
1717         __u32 pixfmt = pix->pixelformat;
1718         const struct soc_camera_format_xlate *xlate;
1719         /* Keep Compiler Happy */
1720         unsigned int ceu_sub_width = 0, ceu_sub_height = 0;
1721         u16 scale_v, scale_h;
1722         int ret;
1723         bool image_mode;
1724         enum v4l2_field field;
1725
1726         switch (pix->field) {
1727         default:
1728                 pix->field = V4L2_FIELD_NONE;
1729                 /* fall-through */
1730         case V4L2_FIELD_INTERLACED_TB:
1731         case V4L2_FIELD_INTERLACED_BT:
1732         case V4L2_FIELD_NONE:
1733                 field = pix->field;
1734                 break;
1735         case V4L2_FIELD_INTERLACED:
1736                 field = V4L2_FIELD_INTERLACED_TB;
1737                 break;
1738         }
1739
1740         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1741         if (!xlate) {
1742                 dev_warn(dev, "Format %x not found\n", pixfmt);
1743                 return -EINVAL;
1744         }
1745
1746         /* 1.-4. Calculate desired client output geometry */
1747         calculate_client_output(icd, pix, &mf);
1748         mf.field        = pix->field;
1749         mf.colorspace   = pix->colorspace;
1750         mf.code         = xlate->code;
1751
1752         switch (pixfmt) {
1753         case V4L2_PIX_FMT_NV12:
1754         case V4L2_PIX_FMT_NV21:
1755         case V4L2_PIX_FMT_NV16:
1756         case V4L2_PIX_FMT_NV61:
1757                 image_mode = true;
1758                 break;
1759         default:
1760                 image_mode = false;
1761         }
1762
1763         dev_geo(dev, "S_FMT(pix=0x%x, fld 0x%x, code 0x%x, %ux%u)\n", pixfmt, mf.field, mf.code,
1764                 pix->width, pix->height);
1765
1766         dev_geo(dev, "4: request camera output %ux%u\n", mf.width, mf.height);
1767
1768         /* 5. - 9. */
1769         ret = client_scale(icd, &mf, &ceu_sub_width, &ceu_sub_height,
1770                            image_mode && V4L2_FIELD_NONE == field);
1771
1772         dev_geo(dev, "5-9: client scale return %d\n", ret);
1773
1774         /* Done with the camera. Now see if we can improve the result */
1775
1776         dev_geo(dev, "fmt %ux%u, requested %ux%u\n",
1777                 mf.width, mf.height, pix->width, pix->height);
1778         if (ret < 0)
1779                 return ret;
1780
1781         if (mf.code != xlate->code)
1782                 return -EINVAL;
1783
1784         /* 9. Prepare CEU crop */
1785         cam->width = mf.width;
1786         cam->height = mf.height;
1787
1788         /* 10. Use CEU scaling to scale to the requested user window. */
1789
1790         /* We cannot scale up */
1791         if (pix->width > ceu_sub_width)
1792                 ceu_sub_width = pix->width;
1793
1794         if (pix->height > ceu_sub_height)
1795                 ceu_sub_height = pix->height;
1796
1797         pix->colorspace = mf.colorspace;
1798
1799         if (image_mode) {
1800                 /* Scale pix->{width x height} down to width x height */
1801                 scale_h         = calc_scale(ceu_sub_width, &pix->width);
1802                 scale_v         = calc_scale(ceu_sub_height, &pix->height);
1803         } else {
1804                 pix->width      = ceu_sub_width;
1805                 pix->height     = ceu_sub_height;
1806                 scale_h         = 0;
1807                 scale_v         = 0;
1808         }
1809
1810         pcdev->cflcr = scale_h | (scale_v << 16);
1811
1812         /*
1813          * We have calculated CFLCR, the actual configuration will be performed
1814          * in sh_mobile_ceu_set_bus_param()
1815          */
1816
1817         dev_geo(dev, "10: W: %u : 0x%x = %u, H: %u : 0x%x = %u\n",
1818                 ceu_sub_width, scale_h, pix->width,
1819                 ceu_sub_height, scale_v, pix->height);
1820
1821         cam->code               = xlate->code;
1822         icd->current_fmt        = xlate;
1823
1824         pcdev->field = field;
1825         pcdev->image_mode = image_mode;
1826
1827         /* CFSZR requirement */
1828         pix->width      &= ~3;
1829         pix->height     &= ~3;
1830
1831         return 0;
1832 }
1833
1834 static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
1835                                  struct v4l2_format *f)
1836 {
1837         const struct soc_camera_format_xlate *xlate;
1838         struct v4l2_pix_format *pix = &f->fmt.pix;
1839         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1840         struct v4l2_mbus_framefmt mf;
1841         __u32 pixfmt = pix->pixelformat;
1842         int width, height;
1843         int ret;
1844
1845         dev_geo(icd->parent, "TRY_FMT(pix=0x%x, %ux%u)\n",
1846                  pixfmt, pix->width, pix->height);
1847
1848         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1849         if (!xlate) {
1850                 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
1851                 return -EINVAL;
1852         }
1853
1854         /* FIXME: calculate using depth and bus width */
1855
1856         /* CFSZR requires height and width to be 4-pixel aligned */
1857         v4l_bound_align_image(&pix->width, 2, 2560, 2,
1858                               &pix->height, 4, 1920, 2, 0);
1859
1860         width = pix->width;
1861         height = pix->height;
1862
1863         /* limit to sensor capabilities */
1864         mf.width        = pix->width;
1865         mf.height       = pix->height;
1866         mf.field        = pix->field;
1867         mf.code         = xlate->code;
1868         mf.colorspace   = pix->colorspace;
1869
1870         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video, try_mbus_fmt, &mf);
1871         if (ret < 0)
1872                 return ret;
1873
1874         pix->width      = mf.width;
1875         pix->height     = mf.height;
1876         pix->field      = mf.field;
1877         pix->colorspace = mf.colorspace;
1878
1879         switch (pixfmt) {
1880         case V4L2_PIX_FMT_NV12:
1881         case V4L2_PIX_FMT_NV21:
1882         case V4L2_PIX_FMT_NV16:
1883         case V4L2_PIX_FMT_NV61:
1884                 /* FIXME: check against rect_max after converting soc-camera */
1885                 /* We can scale precisely, need a bigger image from camera */
1886                 if (pix->width < width || pix->height < height) {
1887                         /*
1888                          * We presume, the sensor behaves sanely, i.e., if
1889                          * requested a bigger rectangle, it will not return a
1890                          * smaller one.
1891                          */
1892                         mf.width = 2560;
1893                         mf.height = 1920;
1894                         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
1895                                                          try_mbus_fmt, &mf);
1896                         if (ret < 0) {
1897                                 /* Shouldn't actually happen... */
1898                                 dev_err(icd->parent,
1899                                         "FIXME: client try_fmt() = %d\n", ret);
1900                                 return ret;
1901                         }
1902                 }
1903                 /* We will scale exactly */
1904                 if (mf.width > width)
1905                         pix->width = width;
1906                 if (mf.height > height)
1907                         pix->height = height;
1908         }
1909
1910         pix->width      &= ~3;
1911         pix->height     &= ~3;
1912
1913         dev_geo(icd->parent, "%s(): return %d, fmt 0x%x, %ux%u\n",
1914                 __func__, ret, pix->pixelformat, pix->width, pix->height);
1915
1916         return ret;
1917 }
1918
1919 static int sh_mobile_ceu_set_livecrop(struct soc_camera_device *icd,
1920                                       struct v4l2_crop *a)
1921 {
1922         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1923         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1924         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1925         u32 out_width = icd->user_width, out_height = icd->user_height;
1926         int ret;
1927
1928         /* Freeze queue */
1929         pcdev->frozen = 1;
1930         /* Wait for frame */
1931         ret = wait_for_completion_interruptible(&pcdev->complete);
1932         /* Stop the client */
1933         ret = v4l2_subdev_call(sd, video, s_stream, 0);
1934         if (ret < 0)
1935                 dev_warn(icd->parent,
1936                          "Client failed to stop the stream: %d\n", ret);
1937         else
1938                 /* Do the crop, if it fails, there's nothing more we can do */
1939                 sh_mobile_ceu_set_crop(icd, a);
1940
1941         dev_geo(icd->parent, "Output after crop: %ux%u\n", icd->user_width, icd->user_height);
1942
1943         if (icd->user_width != out_width || icd->user_height != out_height) {
1944                 struct v4l2_format f = {
1945                         .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1946                         .fmt.pix        = {
1947                                 .width          = out_width,
1948                                 .height         = out_height,
1949                                 .pixelformat    = icd->current_fmt->host_fmt->fourcc,
1950                                 .field          = pcdev->field,
1951                                 .colorspace     = icd->colorspace,
1952                         },
1953                 };
1954                 ret = sh_mobile_ceu_set_fmt(icd, &f);
1955                 if (!ret && (out_width != f.fmt.pix.width ||
1956                              out_height != f.fmt.pix.height))
1957                         ret = -EINVAL;
1958                 if (!ret) {
1959                         icd->user_width         = out_width & ~3;
1960                         icd->user_height        = out_height & ~3;
1961                         ret = sh_mobile_ceu_set_bus_param(icd,
1962                                         icd->current_fmt->host_fmt->fourcc);
1963                 }
1964         }
1965
1966         /* Thaw the queue */
1967         pcdev->frozen = 0;
1968         spin_lock_irq(&pcdev->lock);
1969         sh_mobile_ceu_capture(pcdev);
1970         spin_unlock_irq(&pcdev->lock);
1971         /* Start the client */
1972         ret = v4l2_subdev_call(sd, video, s_stream, 1);
1973         return ret;
1974 }
1975
1976 static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
1977 {
1978         struct soc_camera_device *icd = file->private_data;
1979
1980         return vb2_poll(&icd->vb2_vidq, file, pt);
1981 }
1982
1983 static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
1984                                   struct v4l2_capability *cap)
1985 {
1986         strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
1987         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1988         return 0;
1989 }
1990
1991 static int sh_mobile_ceu_init_videobuf(struct vb2_queue *q,
1992                                        struct soc_camera_device *icd)
1993 {
1994         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1995         q->io_modes = VB2_MMAP | VB2_USERPTR;
1996         q->drv_priv = icd;
1997         q->ops = &sh_mobile_ceu_videobuf_ops;
1998         q->mem_ops = &vb2_dma_contig_memops;
1999         q->buf_struct_size = sizeof(struct sh_mobile_ceu_buffer);
2000
2001         return vb2_queue_init(q);
2002 }
2003
2004 static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
2005         .owner          = THIS_MODULE,
2006         .add            = sh_mobile_ceu_add_device,
2007         .remove         = sh_mobile_ceu_remove_device,
2008         .get_formats    = sh_mobile_ceu_get_formats,
2009         .put_formats    = sh_mobile_ceu_put_formats,
2010         .get_crop       = sh_mobile_ceu_get_crop,
2011         .set_crop       = sh_mobile_ceu_set_crop,
2012         .set_livecrop   = sh_mobile_ceu_set_livecrop,
2013         .set_fmt        = sh_mobile_ceu_set_fmt,
2014         .try_fmt        = sh_mobile_ceu_try_fmt,
2015         .poll           = sh_mobile_ceu_poll,
2016         .querycap       = sh_mobile_ceu_querycap,
2017         .set_bus_param  = sh_mobile_ceu_set_bus_param,
2018         .init_videobuf2 = sh_mobile_ceu_init_videobuf,
2019 };
2020
2021 struct bus_wait {
2022         struct notifier_block   notifier;
2023         struct completion       completion;
2024         struct device           *dev;
2025 };
2026
2027 static int bus_notify(struct notifier_block *nb,
2028                       unsigned long action, void *data)
2029 {
2030         struct device *dev = data;
2031         struct bus_wait *wait = container_of(nb, struct bus_wait, notifier);
2032
2033         if (wait->dev != dev)
2034                 return NOTIFY_DONE;
2035
2036         switch (action) {
2037         case BUS_NOTIFY_UNBOUND_DRIVER:
2038                 /* Protect from module unloading */
2039                 wait_for_completion(&wait->completion);
2040                 return NOTIFY_OK;
2041         }
2042         return NOTIFY_DONE;
2043 }
2044
2045 static int __devinit sh_mobile_ceu_probe(struct platform_device *pdev)
2046 {
2047         struct sh_mobile_ceu_dev *pcdev;
2048         struct resource *res;
2049         void __iomem *base;
2050         unsigned int irq;
2051         int err = 0;
2052         struct bus_wait wait = {
2053                 .completion = COMPLETION_INITIALIZER_ONSTACK(wait.completion),
2054                 .notifier.notifier_call = bus_notify,
2055         };
2056         struct sh_mobile_ceu_companion *csi2;
2057
2058         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2059         irq = platform_get_irq(pdev, 0);
2060         if (!res || (int)irq <= 0) {
2061                 dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
2062                 err = -ENODEV;
2063                 goto exit;
2064         }
2065
2066         pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
2067         if (!pcdev) {
2068                 dev_err(&pdev->dev, "Could not allocate pcdev\n");
2069                 err = -ENOMEM;
2070                 goto exit;
2071         }
2072
2073         INIT_LIST_HEAD(&pcdev->capture);
2074         spin_lock_init(&pcdev->lock);
2075         init_completion(&pcdev->complete);
2076
2077         pcdev->pdata = pdev->dev.platform_data;
2078         if (!pcdev->pdata) {
2079                 err = -EINVAL;
2080                 dev_err(&pdev->dev, "CEU platform data not set.\n");
2081                 goto exit_kfree;
2082         }
2083
2084         base = ioremap_nocache(res->start, resource_size(res));
2085         if (!base) {
2086                 err = -ENXIO;
2087                 dev_err(&pdev->dev, "Unable to ioremap CEU registers.\n");
2088                 goto exit_kfree;
2089         }
2090
2091         pcdev->irq = irq;
2092         pcdev->base = base;
2093         pcdev->video_limit = 0; /* only enabled if second resource exists */
2094
2095         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
2096         if (res) {
2097                 err = dma_declare_coherent_memory(&pdev->dev, res->start,
2098                                                   res->start,
2099                                                   resource_size(res),
2100                                                   DMA_MEMORY_MAP |
2101                                                   DMA_MEMORY_EXCLUSIVE);
2102                 if (!err) {
2103                         dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
2104                         err = -ENXIO;
2105                         goto exit_iounmap;
2106                 }
2107
2108                 pcdev->video_limit = resource_size(res);
2109         }
2110
2111         /* request irq */
2112         err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED,
2113                           dev_name(&pdev->dev), pcdev);
2114         if (err) {
2115                 dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
2116                 goto exit_release_mem;
2117         }
2118
2119         pm_suspend_ignore_children(&pdev->dev, true);
2120         pm_runtime_enable(&pdev->dev);
2121         pm_runtime_resume(&pdev->dev);
2122
2123         pcdev->ici.priv = pcdev;
2124         pcdev->ici.v4l2_dev.dev = &pdev->dev;
2125         pcdev->ici.nr = pdev->id;
2126         pcdev->ici.drv_name = dev_name(&pdev->dev);
2127         pcdev->ici.ops = &sh_mobile_ceu_host_ops;
2128
2129         pcdev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
2130         if (IS_ERR(pcdev->alloc_ctx)) {
2131                 err = PTR_ERR(pcdev->alloc_ctx);
2132                 goto exit_free_clk;
2133         }
2134
2135         err = soc_camera_host_register(&pcdev->ici);
2136         if (err)
2137                 goto exit_free_ctx;
2138
2139         /* CSI2 interfacing */
2140         csi2 = pcdev->pdata->csi2;
2141         if (csi2) {
2142                 struct platform_device *csi2_pdev =
2143                         platform_device_alloc("sh-mobile-csi2", csi2->id);
2144                 struct sh_csi2_pdata *csi2_pdata = csi2->platform_data;
2145
2146                 if (!csi2_pdev) {
2147                         err = -ENOMEM;
2148                         goto exit_host_unregister;
2149                 }
2150
2151                 pcdev->csi2_pdev                = csi2_pdev;
2152
2153                 err = platform_device_add_data(csi2_pdev, csi2_pdata, sizeof(*csi2_pdata));
2154                 if (err < 0)
2155                         goto exit_pdev_put;
2156
2157                 csi2_pdata                      = csi2_pdev->dev.platform_data;
2158                 csi2_pdata->v4l2_dev            = &pcdev->ici.v4l2_dev;
2159
2160                 csi2_pdev->resource             = csi2->resource;
2161                 csi2_pdev->num_resources        = csi2->num_resources;
2162
2163                 err = platform_device_add(csi2_pdev);
2164                 if (err < 0)
2165                         goto exit_pdev_put;
2166
2167                 wait.dev = &csi2_pdev->dev;
2168
2169                 err = bus_register_notifier(&platform_bus_type, &wait.notifier);
2170                 if (err < 0)
2171                         goto exit_pdev_unregister;
2172
2173                 /*
2174                  * From this point the driver module will not unload, until
2175                  * we complete the completion.
2176                  */
2177
2178                 if (!csi2_pdev->dev.driver) {
2179                         complete(&wait.completion);
2180                         /* Either too late, or probing failed */
2181                         bus_unregister_notifier(&platform_bus_type, &wait.notifier);
2182                         err = -ENXIO;
2183                         goto exit_pdev_unregister;
2184                 }
2185
2186                 /*
2187                  * The module is still loaded, in the worst case it is hanging
2188                  * in device release on our completion. So, _now_ dereferencing
2189                  * the "owner" is safe!
2190                  */
2191
2192                 err = try_module_get(csi2_pdev->dev.driver->owner);
2193
2194                 /* Let notifier complete, if it has been locked */
2195                 complete(&wait.completion);
2196                 bus_unregister_notifier(&platform_bus_type, &wait.notifier);
2197                 if (!err) {
2198                         err = -ENODEV;
2199                         goto exit_pdev_unregister;
2200                 }
2201         }
2202
2203         return 0;
2204
2205 exit_pdev_unregister:
2206         platform_device_del(pcdev->csi2_pdev);
2207 exit_pdev_put:
2208         pcdev->csi2_pdev->resource = NULL;
2209         platform_device_put(pcdev->csi2_pdev);
2210 exit_host_unregister:
2211         soc_camera_host_unregister(&pcdev->ici);
2212 exit_free_ctx:
2213         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
2214 exit_free_clk:
2215         pm_runtime_disable(&pdev->dev);
2216         free_irq(pcdev->irq, pcdev);
2217 exit_release_mem:
2218         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
2219                 dma_release_declared_memory(&pdev->dev);
2220 exit_iounmap:
2221         iounmap(base);
2222 exit_kfree:
2223         kfree(pcdev);
2224 exit:
2225         return err;
2226 }
2227
2228 static int __devexit sh_mobile_ceu_remove(struct platform_device *pdev)
2229 {
2230         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
2231         struct sh_mobile_ceu_dev *pcdev = container_of(soc_host,
2232                                         struct sh_mobile_ceu_dev, ici);
2233         struct platform_device *csi2_pdev = pcdev->csi2_pdev;
2234
2235         soc_camera_host_unregister(soc_host);
2236         pm_runtime_disable(&pdev->dev);
2237         free_irq(pcdev->irq, pcdev);
2238         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
2239                 dma_release_declared_memory(&pdev->dev);
2240         iounmap(pcdev->base);
2241         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
2242         if (csi2_pdev && csi2_pdev->dev.driver) {
2243                 struct module *csi2_drv = csi2_pdev->dev.driver->owner;
2244                 platform_device_del(csi2_pdev);
2245                 csi2_pdev->resource = NULL;
2246                 platform_device_put(csi2_pdev);
2247                 module_put(csi2_drv);
2248         }
2249         kfree(pcdev);
2250
2251         return 0;
2252 }
2253
2254 static int sh_mobile_ceu_runtime_nop(struct device *dev)
2255 {
2256         /* Runtime PM callback shared between ->runtime_suspend()
2257          * and ->runtime_resume(). Simply returns success.
2258          *
2259          * This driver re-initializes all registers after
2260          * pm_runtime_get_sync() anyway so there is no need
2261          * to save and restore registers here.
2262          */
2263         return 0;
2264 }
2265
2266 static const struct dev_pm_ops sh_mobile_ceu_dev_pm_ops = {
2267         .runtime_suspend = sh_mobile_ceu_runtime_nop,
2268         .runtime_resume = sh_mobile_ceu_runtime_nop,
2269 };
2270
2271 static struct platform_driver sh_mobile_ceu_driver = {
2272         .driver         = {
2273                 .name   = "sh_mobile_ceu",
2274                 .pm     = &sh_mobile_ceu_dev_pm_ops,
2275         },
2276         .probe          = sh_mobile_ceu_probe,
2277         .remove         = __devexit_p(sh_mobile_ceu_remove),
2278 };
2279
2280 static int __init sh_mobile_ceu_init(void)
2281 {
2282         /* Whatever return code */
2283         request_module("sh_mobile_csi2");
2284         return platform_driver_register(&sh_mobile_ceu_driver);
2285 }
2286
2287 static void __exit sh_mobile_ceu_exit(void)
2288 {
2289         platform_driver_unregister(&sh_mobile_ceu_driver);
2290 }
2291
2292 module_init(sh_mobile_ceu_init);
2293 module_exit(sh_mobile_ceu_exit);
2294
2295 MODULE_DESCRIPTION("SuperH Mobile CEU driver");
2296 MODULE_AUTHOR("Magnus Damm");
2297 MODULE_LICENSE("GPL");
2298 MODULE_VERSION("0.0.6");
2299 MODULE_ALIAS("platform:sh_mobile_ceu");