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         /* static max sizes either from platform data or default */
 116         int max_width;
 117         int max_height;
 118
 119         enum v4l2_field field;
 120         int sequence;
 121
 122         unsigned int image_mode:1;
 123         unsigned int is_16bit:1;
 124         unsigned int frozen:1;
 125 };
 126
 127 struct sh_mobile_ceu_cam {
 128         /* CEU offsets within the camera output, before the CEU scaler */
 129         unsigned int ceu_left;
 130         unsigned int ceu_top;
 131         /* Client output, as seen by the CEU */
 132         unsigned int width;
 133         unsigned int height;
 134         /*
 135          * User window from S_CROP / G_CROP, produced by client cropping and
 136          * scaling, CEU scaling and CEU cropping, mapped back onto the client
 137          * input window
 138          */
 139         struct v4l2_rect subrect;
 140         /* Camera cropping rectangle */
 141         struct v4l2_rect rect;
 142         const struct soc_mbus_pixelfmt *extra_fmt;
 143         enum v4l2_mbus_pixelcode code;
 144 };
 145
 146 static struct sh_mobile_ceu_buffer *to_ceu_vb(struct vb2_buffer *vb)
 147 {
 148         return container_of(vb, struct sh_mobile_ceu_buffer, vb);
 149 }
 150
 151 static void ceu_write(struct sh_mobile_ceu_dev *priv,
 152                       unsigned long reg_offs, u32 data)
 153 {
 154         iowrite32(data, priv->base + reg_offs);
 155 }
 156
 157 static u32 ceu_read(struct sh_mobile_ceu_dev *priv, unsigned long reg_offs)
 158 {
 159         return ioread32(priv->base + reg_offs);
 160 }
 161
 162 static int sh_mobile_ceu_soft_reset(struct sh_mobile_ceu_dev *pcdev)
 163 {
 164         int i, success = 0;
 165         struct soc_camera_device *icd = pcdev->icd;
 166
 167         ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
 168
 169         /* wait CSTSR.CPTON bit */
 170         for (i = 0; i < 1000; i++) {
 171                 if (!(ceu_read(pcdev, CSTSR) & 1)) {
 172                         success++;
 173                         break;
 174                 }
 175                 udelay(1);
 176         }
 177
 178         /* wait CAPSR.CPKIL bit */
 179         for (i = 0; i < 1000; i++) {
 180                 if (!(ceu_read(pcdev, CAPSR) & (1 << 16))) {
 181                         success++;
 182                         break;
 183                 }
 184                 udelay(1);
 185         }
 186
 187
 188         if (2 != success) {
 189                 dev_warn(icd->pdev, "soft reset time out\n");
 190                 return -EIO;
 191         }
 192
 193         return 0;
 194 }
 195
 196 /*
 197  *  Videobuf operations
 198  */
 199
 200 /*
 201  * .queue_setup() is called to check, whether the driver can accept the
 202  *                requested number of buffers and to fill in plane sizes
 203  *                for the current frame format if required
 204  */
 205 static int sh_mobile_ceu_videobuf_setup(struct vb2_queue *vq,
 206                         const struct v4l2_format *fmt,
 207                         unsigned int *count, unsigned int *num_planes,
 208                         unsigned int sizes[], void *alloc_ctxs[])
 209 {
 210         struct soc_camera_device *icd = container_of(vq, struct soc_camera_device, vb2_vidq);
 211         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 212         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 213
 214         if (fmt) {
 215                 const struct soc_camera_format_xlate *xlate = soc_camera_xlate_by_fourcc(icd,
 216                                                                 fmt->fmt.pix.pixelformat);
 217                 unsigned int bytes_per_line;
 218                 int ret;
 219
 220                 if (!xlate)
 221                         return -EINVAL;
 222
 223                 ret = soc_mbus_bytes_per_line(fmt->fmt.pix.width,
 224                                               xlate->host_fmt);
 225                 if (ret < 0)
 226                         return ret;
 227
 228                 bytes_per_line = max_t(u32, fmt->fmt.pix.bytesperline, ret);
 229
 230                 ret = soc_mbus_image_size(xlate->host_fmt, bytes_per_line,
 231                                           fmt->fmt.pix.height);
 232                 if (ret < 0)
 233                         return ret;
 234
 235                 sizes[0] = max_t(u32, fmt->fmt.pix.sizeimage, ret);
 236         } else {
 237                 /* Called from VIDIOC_REQBUFS or in compatibility mode */
 238                 sizes[0] = icd->sizeimage;
 239         }
 240
 241         alloc_ctxs[0] = pcdev->alloc_ctx;
 242
 243         if (!vq->num_buffers)
 244                 pcdev->sequence = 0;
 245
 246         if (!*count)
 247                 *count = 2;
 248
 249         /* If *num_planes != 0, we have already verified *count. */
 250         if (pcdev->video_limit && !*num_planes) {
 251                 size_t size = PAGE_ALIGN(sizes[0]) * *count;
 252
 253                 if (size + pcdev->buf_total > pcdev->video_limit)
 254                         *count = (pcdev->video_limit - pcdev->buf_total) /
 255                                 PAGE_ALIGN(sizes[0]);
 256         }
 257
 258         *num_planes = 1;
 259
 260         dev_dbg(icd->parent, "count=%d, size=%u\n", *count, sizes[0]);
 261
 262         return 0;
 263 }
 264
 265 #define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */
 266 #define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */
 267 #define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */
 268 #define CEU_CEIER_VBP   (1 << 20) /* vbp error */
 269 #define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */
 270 #define CEU_CEIER_MASK (CEU_CEIER_CPEIE | CEU_CEIER_VBP)
 271
 272
 273 /*
 274  * return value doesn't reflex the success/failure to queue the new buffer,
 275  * but rather the status of the previous buffer.
 276  */
 277 static int sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
 278 {
 279         struct soc_camera_device *icd = pcdev->icd;
 280         dma_addr_t phys_addr_top, phys_addr_bottom;
 281         unsigned long top1, top2;
 282         unsigned long bottom1, bottom2;
 283         u32 status;
 284         bool planar;
 285         int ret = 0;
 286
 287         /*
 288          * The hardware is _very_ picky about this sequence. Especially
 289          * the CEU_CETCR_MAGIC value. It seems like we need to acknowledge
 290          * several not-so-well documented interrupt sources in CETCR.
 291          */
 292         ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_MASK);
 293         status = ceu_read(pcdev, CETCR);
 294         ceu_write(pcdev, CETCR, ~status & CEU_CETCR_MAGIC);
 295         if (!pcdev->frozen)
 296                 ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_MASK);
 297         ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP);
 298         ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW);
 299
 300         /*
 301          * When a VBP interrupt occurs, a capture end interrupt does not occur
 302          * and the image of that frame is not captured correctly. So, soft reset
 303          * is needed here.
 304          */
 305         if (status & CEU_CEIER_VBP) {
 306                 sh_mobile_ceu_soft_reset(pcdev);
 307                 ret = -EIO;
 308         }
 309
 310         if (pcdev->frozen) {
 311                 complete(&pcdev->complete);
 312                 return ret;
 313         }
 314
 315         if (!pcdev->active)
 316                 return ret;
 317
 318         if (V4L2_FIELD_INTERLACED_BT == pcdev->field) {
 319                 top1    = CDBYR;
 320                 top2    = CDBCR;
 321                 bottom1 = CDAYR;
 322                 bottom2 = CDACR;
 323         } else {
 324                 top1    = CDAYR;
 325                 top2    = CDACR;
 326                 bottom1 = CDBYR;
 327                 bottom2 = CDBCR;
 328         }
 329
 330         phys_addr_top = vb2_dma_contig_plane_dma_addr(pcdev->active, 0);
 331
 332         switch (icd->current_fmt->host_fmt->fourcc) {
 333         case V4L2_PIX_FMT_NV12:
 334         case V4L2_PIX_FMT_NV21:
 335         case V4L2_PIX_FMT_NV16:
 336         case V4L2_PIX_FMT_NV61:
 337                 planar = true;
 338                 break;
 339         default:
 340                 planar = false;
 341         }
 342
 343         ceu_write(pcdev, top1, phys_addr_top);
 344         if (V4L2_FIELD_NONE != pcdev->field) {
 345                 phys_addr_bottom = phys_addr_top + icd->bytesperline;
 346                 ceu_write(pcdev, bottom1, phys_addr_bottom);
 347         }
 348
 349         if (planar) {
 350                 phys_addr_top += icd->bytesperline * icd->user_height;
 351                 ceu_write(pcdev, top2, phys_addr_top);
 352                 if (V4L2_FIELD_NONE != pcdev->field) {
 353                         phys_addr_bottom = phys_addr_top + icd->bytesperline;
 354                         ceu_write(pcdev, bottom2, phys_addr_bottom);
 355                 }
 356         }
 357
 358         ceu_write(pcdev, CAPSR, 0x1); /* start capture */
 359
 360         return ret;
 361 }
 362
 363 static int sh_mobile_ceu_videobuf_prepare(struct vb2_buffer *vb)
 364 {
 365         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb);
 366
 367         /* Added list head initialization on alloc */
 368         WARN(!list_empty(&buf->queue), "Buffer %p on queue!\n", vb);
 369
 370         return 0;
 371 }
 372
 373 static void sh_mobile_ceu_videobuf_queue(struct vb2_buffer *vb)
 374 {
 375         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
 376         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 377         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 378         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb);
 379         unsigned long size;
 380
 381         size = icd->sizeimage;
 382
 383         if (vb2_plane_size(vb, 0) < size) {
 384                 dev_err(icd->parent, "Buffer #%d too small (%lu < %lu)\n",
 385                         vb->v4l2_buf.index, vb2_plane_size(vb, 0), size);
 386                 goto error;
 387         }
 388
 389         vb2_set_plane_payload(vb, 0, size);
 390
 391         dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
 392                 vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
 393
 394 #ifdef DEBUG
 395         /*
 396          * This can be useful if you want to see if we actually fill
 397          * the buffer with something
 398          */
 399         if (vb2_plane_vaddr(vb, 0))
 400                 memset(vb2_plane_vaddr(vb, 0), 0xaa, vb2_get_plane_payload(vb, 0));
 401 #endif
 402
 403         spin_lock_irq(&pcdev->lock);
 404         list_add_tail(&buf->queue, &pcdev->capture);
 405
 406         if (!pcdev->active) {
 407                 /*
 408                  * Because there were no active buffer at this moment,
 409                  * we are not interested in the return value of
 410                  * sh_mobile_ceu_capture here.
 411                  */
 412                 pcdev->active = vb;
 413                 sh_mobile_ceu_capture(pcdev);
 414         }
 415         spin_unlock_irq(&pcdev->lock);
 416
 417         return;
 418
 419 error:
 420         vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
 421 }
 422
 423 static void sh_mobile_ceu_videobuf_release(struct vb2_buffer *vb)
 424 {
 425         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
 426         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 427         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb);
 428         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 429
 430         spin_lock_irq(&pcdev->lock);
 431
 432         if (pcdev->active == vb) {
 433                 /* disable capture (release DMA buffer), reset */
 434                 ceu_write(pcdev, CAPSR, 1 << 16);
 435                 pcdev->active = NULL;
 436         }
 437
 438         /*
 439          * Doesn't hurt also if the list is empty, but it hurts, if queuing the
 440          * buffer failed, and .buf_init() hasn't been called
 441          */
 442         if (buf->queue.next)
 443                 list_del_init(&buf->queue);
 444
 445         pcdev->buf_total -= PAGE_ALIGN(vb2_plane_size(vb, 0));
 446         dev_dbg(icd->parent, "%s() %zu bytes buffers\n", __func__,
 447                 pcdev->buf_total);
 448
 449         spin_unlock_irq(&pcdev->lock);
 450 }
 451
 452 static int sh_mobile_ceu_videobuf_init(struct vb2_buffer *vb)
 453 {
 454         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
 455         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 456         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 457
 458         pcdev->buf_total += PAGE_ALIGN(vb2_plane_size(vb, 0));
 459         dev_dbg(icd->parent, "%s() %zu bytes buffers\n", __func__,
 460                 pcdev->buf_total);
 461
 462         /* This is for locking debugging only */
 463         INIT_LIST_HEAD(&to_ceu_vb(vb)->queue);
 464         return 0;
 465 }
 466
 467 static int sh_mobile_ceu_stop_streaming(struct vb2_queue *q)
 468 {
 469         struct soc_camera_device *icd = container_of(q, struct soc_camera_device, vb2_vidq);
 470         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 471         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 472         struct list_head *buf_head, *tmp;
 473
 474         spin_lock_irq(&pcdev->lock);
 475
 476         pcdev->active = NULL;
 477
 478         list_for_each_safe(buf_head, tmp, &pcdev->capture)
 479                 list_del_init(buf_head);
 480
 481         spin_unlock_irq(&pcdev->lock);
 482
 483         return sh_mobile_ceu_soft_reset(pcdev);
 484 }
 485
 486 static struct vb2_ops sh_mobile_ceu_videobuf_ops = {
 487         .queue_setup    = sh_mobile_ceu_videobuf_setup,
 488         .buf_prepare    = sh_mobile_ceu_videobuf_prepare,
 489         .buf_queue      = sh_mobile_ceu_videobuf_queue,
 490         .buf_cleanup    = sh_mobile_ceu_videobuf_release,
 491         .buf_init       = sh_mobile_ceu_videobuf_init,
 492         .wait_prepare   = soc_camera_unlock,
 493         .wait_finish    = soc_camera_lock,
 494         .stop_streaming = sh_mobile_ceu_stop_streaming,
 495 };
 496
 497 static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
 498 {
 499         struct sh_mobile_ceu_dev *pcdev = data;
 500         struct vb2_buffer *vb;
 501         int ret;
 502
 503         spin_lock(&pcdev->lock);
 504
 505         vb = pcdev->active;
 506         if (!vb)
 507                 /* Stale interrupt from a released buffer */
 508                 goto out;
 509
 510         list_del_init(&to_ceu_vb(vb)->queue);
 511
 512         if (!list_empty(&pcdev->capture))
 513                 pcdev->active = &list_entry(pcdev->capture.next,
 514                                             struct sh_mobile_ceu_buffer, queue)->vb;
 515         else
 516                 pcdev->active = NULL;
 517
 518         ret = sh_mobile_ceu_capture(pcdev);
 519         do_gettimeofday(&vb->v4l2_buf.timestamp);
 520         if (!ret) {
 521                 vb->v4l2_buf.field = pcdev->field;
 522                 vb->v4l2_buf.sequence = pcdev->sequence++;
 523         }
 524         vb2_buffer_done(vb, ret < 0 ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 525
 526 out:
 527         spin_unlock(&pcdev->lock);
 528
 529         return IRQ_HANDLED;
 530 }
 531
 532 static struct v4l2_subdev *find_csi2(struct sh_mobile_ceu_dev *pcdev)
 533 {
 534         struct v4l2_subdev *sd;
 535
 536         if (!pcdev->csi2_pdev)
 537                 return NULL;
 538
 539         v4l2_device_for_each_subdev(sd, &pcdev->ici.v4l2_dev)
 540                 if (&pcdev->csi2_pdev->dev == v4l2_get_subdevdata(sd))
 541                         return sd;
 542
 543         return NULL;
 544 }
 545
 546 /* Called with .video_lock held */
 547 static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
 548 {
 549         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 550         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 551         struct v4l2_subdev *csi2_sd;
 552         int ret;
 553
 554         if (pcdev->icd)
 555                 return -EBUSY;
 556
 557         dev_info(icd->parent,
 558                  "SuperH Mobile CEU driver attached to camera %d\n",
 559                  icd->devnum);
 560
 561         pm_runtime_get_sync(ici->v4l2_dev.dev);
 562
 563         pcdev->buf_total = 0;
 564
 565         ret = sh_mobile_ceu_soft_reset(pcdev);
 566
 567         csi2_sd = find_csi2(pcdev);
 568         if (csi2_sd) {
 569                 csi2_sd->grp_id = soc_camera_grp_id(icd);
 570                 v4l2_set_subdev_hostdata(csi2_sd, icd);
 571         }
 572
 573         ret = v4l2_subdev_call(csi2_sd, core, s_power, 1);
 574         if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV) {
 575                 pm_runtime_put_sync(ici->v4l2_dev.dev);
 576                 return ret;
 577         }
 578
 579         /*
 580          * -ENODEV is special: either csi2_sd == NULL or the CSI-2 driver
 581          * has not found this soc-camera device among its clients
 582          */
 583         if (ret == -ENODEV && csi2_sd)
 584                 csi2_sd->grp_id = 0;
 585         pcdev->icd = icd;
 586
 587         return 0;
 588 }
 589
 590 /* Called with .video_lock held */
 591 static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
 592 {
 593         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 594         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 595         struct v4l2_subdev *csi2_sd = find_csi2(pcdev);
 596
 597         BUG_ON(icd != pcdev->icd);
 598
 599         v4l2_subdev_call(csi2_sd, core, s_power, 0);
 600         if (csi2_sd)
 601                 csi2_sd->grp_id = 0;
 602         /* disable capture, disable interrupts */
 603         ceu_write(pcdev, CEIER, 0);
 604         sh_mobile_ceu_soft_reset(pcdev);
 605
 606         /* make sure active buffer is canceled */
 607         spin_lock_irq(&pcdev->lock);
 608         if (pcdev->active) {
 609                 list_del_init(&to_ceu_vb(pcdev->active)->queue);
 610                 vb2_buffer_done(pcdev->active, VB2_BUF_STATE_ERROR);
 611                 pcdev->active = NULL;
 612         }
 613         spin_unlock_irq(&pcdev->lock);
 614
 615         pm_runtime_put_sync(ici->v4l2_dev.dev);
 616
 617         dev_info(icd->parent,
 618                  "SuperH Mobile CEU driver detached from camera %d\n",
 619                  icd->devnum);
 620
 621         pcdev->icd = NULL;
 622 }
 623
 624 /*
 625  * See chapter 29.4.12 "Capture Filter Control Register (CFLCR)"
 626  * in SH7722 Hardware Manual
 627  */
 628 static unsigned int size_dst(unsigned int src, unsigned int scale)
 629 {
 630         unsigned int mant_pre = scale >> 12;
 631         if (!src || !scale)
 632                 return src;
 633         return ((mant_pre + 2 * (src - 1)) / (2 * mant_pre) - 1) *
 634                 mant_pre * 4096 / scale + 1;
 635 }
 636
 637 static u16 calc_scale(unsigned int src, unsigned int *dst)
 638 {
 639         u16 scale;
 640
 641         if (src == *dst)
 642                 return 0;
 643
 644         scale = (src * 4096 / *dst) & ~7;
 645
 646         while (scale > 4096 && size_dst(src, scale) < *dst)
 647                 scale -= 8;
 648
 649         *dst = size_dst(src, scale);
 650
 651         return scale;
 652 }
 653
 654 /* rect is guaranteed to not exceed the scaled camera rectangle */
 655 static void sh_mobile_ceu_set_rect(struct soc_camera_device *icd)
 656 {
 657         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 658         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 659         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 660         unsigned int height, width, cdwdr_width, in_width, in_height;
 661         unsigned int left_offset, top_offset;
 662         u32 camor;
 663
 664         dev_geo(icd->parent, "Crop %ux%u@%u:%u\n",
 665                 icd->user_width, icd->user_height, cam->ceu_left, cam->ceu_top);
 666
 667         left_offset     = cam->ceu_left;
 668         top_offset      = cam->ceu_top;
 669
 670         WARN_ON(icd->user_width & 3 || icd->user_height & 3);
 671
 672         width = icd->user_width;
 673
 674         if (pcdev->image_mode) {
 675                 in_width = cam->width;
 676                 if (!pcdev->is_16bit) {
 677                         in_width *= 2;
 678                         left_offset *= 2;
 679                 }
 680         } else {
 681                 unsigned int w_factor;
 682
 683                 switch (icd->current_fmt->host_fmt->packing) {
 684                 case SOC_MBUS_PACKING_2X8_PADHI:
 685                         w_factor = 2;
 686                         break;
 687                 default:
 688                         w_factor = 1;
 689                 }
 690
 691                 in_width = cam->width * w_factor;
 692                 left_offset *= w_factor;
 693         }
 694
 695         cdwdr_width = icd->bytesperline;
 696
 697         height = icd->user_height;
 698         in_height = cam->height;
 699         if (V4L2_FIELD_NONE != pcdev->field) {
 700                 height = (height / 2) & ~3;
 701                 in_height /= 2;
 702                 top_offset /= 2;
 703                 cdwdr_width *= 2;
 704         }
 705
 706         /* CSI2 special configuration */
 707         if (pcdev->pdata->csi2) {
 708                 in_width = ((in_width - 2) * 2);
 709                 left_offset *= 2;
 710         }
 711
 712         /* Set CAMOR, CAPWR, CFSZR, take care of CDWDR */
 713         camor = left_offset | (top_offset << 16);
 714
 715         dev_geo(icd->parent,
 716                 "CAMOR 0x%x, CAPWR 0x%x, CFSZR 0x%x, CDWDR 0x%x\n", camor,
 717                 (in_height << 16) | in_width, (height << 16) | width,
 718                 cdwdr_width);
 719
 720         ceu_write(pcdev, CAMOR, camor);
 721         ceu_write(pcdev, CAPWR, (in_height << 16) | in_width);
 722         /* CFSZR clipping is applied _after_ the scaling filter (CFLCR) */
 723         ceu_write(pcdev, CFSZR, (height << 16) | width);
 724         ceu_write(pcdev, CDWDR, cdwdr_width);
 725 }
 726
 727 static u32 capture_save_reset(struct sh_mobile_ceu_dev *pcdev)
 728 {
 729         u32 capsr = ceu_read(pcdev, CAPSR);
 730         ceu_write(pcdev, CAPSR, 1 << 16); /* reset, stop capture */
 731         return capsr;
 732 }
 733
 734 static void capture_restore(struct sh_mobile_ceu_dev *pcdev, u32 capsr)
 735 {
 736         unsigned long timeout = jiffies + 10 * HZ;
 737
 738         /*
 739          * Wait until the end of the current frame. It can take a long time,
 740          * but if it has been aborted by a CAPSR reset, it shoule exit sooner.
 741          */
 742         while ((ceu_read(pcdev, CSTSR) & 1) && time_before(jiffies, timeout))
 743                 msleep(1);
 744
 745         if (time_after(jiffies, timeout)) {
 746                 dev_err(pcdev->ici.v4l2_dev.dev,
 747                         "Timeout waiting for frame end! Interface problem?\n");
 748                 return;
 749         }
 750
 751         /* Wait until reset clears, this shall not hang... */
 752         while (ceu_read(pcdev, CAPSR) & (1 << 16))
 753                 udelay(10);
 754
 755         /* Anything to restore? */
 756         if (capsr & ~(1 << 16))
 757                 ceu_write(pcdev, CAPSR, capsr);
 758 }
 759
 760 /* Find the bus subdevice driver, e.g., CSI2 */
 761 static struct v4l2_subdev *find_bus_subdev(struct sh_mobile_ceu_dev *pcdev,
 762                                            struct soc_camera_device *icd)
 763 {
 764         if (pcdev->csi2_pdev) {
 765                 struct v4l2_subdev *csi2_sd = find_csi2(pcdev);
 766                 if (csi2_sd && csi2_sd->grp_id == soc_camera_grp_id(icd))
 767                         return csi2_sd;
 768         }
 769
 770         return soc_camera_to_subdev(icd);
 771 }
 772
 773 #define CEU_BUS_FLAGS (V4L2_MBUS_MASTER |       \
 774                 V4L2_MBUS_PCLK_SAMPLE_RISING |  \
 775                 V4L2_MBUS_HSYNC_ACTIVE_HIGH |   \
 776                 V4L2_MBUS_HSYNC_ACTIVE_LOW |    \
 777                 V4L2_MBUS_VSYNC_ACTIVE_HIGH |   \
 778                 V4L2_MBUS_VSYNC_ACTIVE_LOW |    \
 779                 V4L2_MBUS_DATA_ACTIVE_HIGH)
 780
 781 /* Capture is not running, no interrupts, no locking needed */
 782 static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd)
 783 {
 784         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 785         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 786         struct v4l2_subdev *sd = find_bus_subdev(pcdev, icd);
 787         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 788         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
 789         unsigned long value, common_flags = CEU_BUS_FLAGS;
 790         u32 capsr = capture_save_reset(pcdev);
 791         unsigned int yuv_lineskip;
 792         int ret;
 793
 794         /*
 795          * If the client doesn't implement g_mbus_config, we just use our
 796          * platform data
 797          */
 798         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
 799         if (!ret) {
 800                 common_flags = soc_mbus_config_compatible(&cfg,
 801                                                           common_flags);
 802                 if (!common_flags)
 803                         return -EINVAL;
 804         } else if (ret != -ENOIOCTLCMD) {
 805                 return ret;
 806         }
 807
 808         /* Make choises, based on platform preferences */
 809         if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
 810             (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
 811                 if (pcdev->pdata->flags & SH_CEU_FLAG_HSYNC_LOW)
 812                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
 813                 else
 814                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
 815         }
 816
 817         if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
 818             (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
 819                 if (pcdev->pdata->flags & SH_CEU_FLAG_VSYNC_LOW)
 820                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
 821                 else
 822                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
 823         }
 824
 825         cfg.flags = common_flags;
 826         ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
 827         if (ret < 0 && ret != -ENOIOCTLCMD)
 828                 return ret;
 829
 830         if (icd->current_fmt->host_fmt->bits_per_sample > 8)
 831                 pcdev->is_16bit = 1;
 832         else
 833                 pcdev->is_16bit = 0;
 834
 835         ceu_write(pcdev, CRCNTR, 0);
 836         ceu_write(pcdev, CRCMPR, 0);
 837
 838         value = 0x00000010; /* data fetch by default */
 839         yuv_lineskip = 0x10;
 840
 841         switch (icd->current_fmt->host_fmt->fourcc) {
 842         case V4L2_PIX_FMT_NV12:
 843         case V4L2_PIX_FMT_NV21:
 844                 /* convert 4:2:2 -> 4:2:0 */
 845                 yuv_lineskip = 0; /* skip for NV12/21, no skip for NV16/61 */
 846                 /* fall-through */
 847         case V4L2_PIX_FMT_NV16:
 848         case V4L2_PIX_FMT_NV61:
 849                 switch (cam->code) {
 850                 case V4L2_MBUS_FMT_UYVY8_2X8:
 851                         value = 0x00000000; /* Cb0, Y0, Cr0, Y1 */
 852                         break;
 853                 case V4L2_MBUS_FMT_VYUY8_2X8:
 854                         value = 0x00000100; /* Cr0, Y0, Cb0, Y1 */
 855                         break;
 856                 case V4L2_MBUS_FMT_YUYV8_2X8:
 857                         value = 0x00000200; /* Y0, Cb0, Y1, Cr0 */
 858                         break;
 859                 case V4L2_MBUS_FMT_YVYU8_2X8:
 860                         value = 0x00000300; /* Y0, Cr0, Y1, Cb0 */
 861                         break;
 862                 default:
 863                         BUG();
 864                 }
 865         }
 866
 867         if (icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV21 ||
 868             icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV61)
 869                 value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */
 870
 871         value |= common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
 872         value |= common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
 873
 874         if (pcdev->pdata->csi2) /* CSI2 mode */
 875                 value |= 3 << 12;
 876         else if (pcdev->is_16bit)
 877                 value |= 1 << 12;
 878         else if (pcdev->pdata->flags & SH_CEU_FLAG_LOWER_8BIT)
 879                 value |= 2 << 12;
 880
 881         ceu_write(pcdev, CAMCR, value);
 882
 883         ceu_write(pcdev, CAPCR, 0x00300000);
 884
 885         switch (pcdev->field) {
 886         case V4L2_FIELD_INTERLACED_TB:
 887                 value = 0x101;
 888                 break;
 889         case V4L2_FIELD_INTERLACED_BT:
 890                 value = 0x102;
 891                 break;
 892         default:
 893                 value = 0;
 894                 break;
 895         }
 896         ceu_write(pcdev, CAIFR, value);
 897
 898         sh_mobile_ceu_set_rect(icd);
 899         mdelay(1);
 900
 901         dev_geo(icd->parent, "CFLCR 0x%x\n", pcdev->cflcr);
 902         ceu_write(pcdev, CFLCR, pcdev->cflcr);
 903
 904         /*
 905          * A few words about byte order (observed in Big Endian mode)
 906          *
 907          * In data fetch mode bytes are received in chunks of 8 bytes.
 908          * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
 909          *
 910          * The data is however by default written to memory in reverse order:
 911          * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
 912          *
 913          * The lowest three bits of CDOCR allows us to do swapping,
 914          * using 7 we swap the data bytes to match the incoming order:
 915          * D0, D1, D2, D3, D4, D5, D6, D7
 916          */
 917         value = 0x00000007 | yuv_lineskip;
 918
 919         ceu_write(pcdev, CDOCR, value);
 920         ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
 921
 922         capture_restore(pcdev, capsr);
 923
 924         /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
 925         return 0;
 926 }
 927
 928 static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd,
 929                                        unsigned char buswidth)
 930 {
 931         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 932         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 933         struct v4l2_subdev *sd = find_bus_subdev(pcdev, icd);
 934         unsigned long common_flags = CEU_BUS_FLAGS;
 935         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
 936         int ret;
 937
 938         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
 939         if (!ret)
 940                 common_flags = soc_mbus_config_compatible(&cfg,
 941                                                           common_flags);
 942         else if (ret != -ENOIOCTLCMD)
 943                 return ret;
 944
 945         if (!common_flags || buswidth > 16)
 946                 return -EINVAL;
 947
 948         return 0;
 949 }
 950
 951 static const struct soc_mbus_pixelfmt sh_mobile_ceu_formats[] = {
 952         {
 953                 .fourcc                 = V4L2_PIX_FMT_NV12,
 954                 .name                   = "NV12",
 955                 .bits_per_sample        = 8,
 956                 .packing                = SOC_MBUS_PACKING_1_5X8,
 957                 .order                  = SOC_MBUS_ORDER_LE,
 958                 .layout                 = SOC_MBUS_LAYOUT_PLANAR_2Y_C,
 959         }, {
 960                 .fourcc                 = V4L2_PIX_FMT_NV21,
 961                 .name                   = "NV21",
 962                 .bits_per_sample        = 8,
 963                 .packing                = SOC_MBUS_PACKING_1_5X8,
 964                 .order                  = SOC_MBUS_ORDER_LE,
 965                 .layout                 = SOC_MBUS_LAYOUT_PLANAR_2Y_C,
 966         }, {
 967                 .fourcc                 = V4L2_PIX_FMT_NV16,
 968                 .name                   = "NV16",
 969                 .bits_per_sample        = 8,
 970                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
 971                 .order                  = SOC_MBUS_ORDER_LE,
 972                 .layout                 = SOC_MBUS_LAYOUT_PLANAR_Y_C,
 973         }, {
 974                 .fourcc                 = V4L2_PIX_FMT_NV61,
 975                 .name                   = "NV61",
 976                 .bits_per_sample        = 8,
 977                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
 978                 .order                  = SOC_MBUS_ORDER_LE,
 979                 .layout                 = SOC_MBUS_LAYOUT_PLANAR_Y_C,
 980         },
 981 };
 982
 983 /* This will be corrected as we get more formats */
 984 static bool sh_mobile_ceu_packing_supported(const struct soc_mbus_pixelfmt *fmt)
 985 {
 986         return  fmt->packing == SOC_MBUS_PACKING_NONE ||
 987                 (fmt->bits_per_sample == 8 &&
 988                  fmt->packing == SOC_MBUS_PACKING_1_5X8) ||
 989                 (fmt->bits_per_sample == 8 &&
 990                  fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
 991                 (fmt->bits_per_sample > 8 &&
 992                  fmt->packing == SOC_MBUS_PACKING_EXTEND16);
 993 }
 994
 995 static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect);
 996
 997 static struct soc_camera_device *ctrl_to_icd(struct v4l2_ctrl *ctrl)
 998 {
 999         return container_of(ctrl->handler, struct soc_camera_device,
1000                                                         ctrl_handler);
1001 }
1002
1003 static int sh_mobile_ceu_s_ctrl(struct v4l2_ctrl *ctrl)
1004 {
1005         struct soc_camera_device *icd = ctrl_to_icd(ctrl);
1006         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1007         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1008
1009         switch (ctrl->id) {
1010         case V4L2_CID_SHARPNESS:
1011                 switch (icd->current_fmt->host_fmt->fourcc) {
1012                 case V4L2_PIX_FMT_NV12:
1013                 case V4L2_PIX_FMT_NV21:
1014                 case V4L2_PIX_FMT_NV16:
1015                 case V4L2_PIX_FMT_NV61:
1016                         ceu_write(pcdev, CLFCR, !ctrl->val);
1017                         return 0;
1018                 }
1019                 break;
1020         }
1021
1022         return -EINVAL;
1023 }
1024
1025 static const struct v4l2_ctrl_ops sh_mobile_ceu_ctrl_ops = {
1026         .s_ctrl = sh_mobile_ceu_s_ctrl,
1027 };
1028
1029 static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, unsigned int idx,
1030                                      struct soc_camera_format_xlate *xlate)
1031 {
1032         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1033         struct device *dev = icd->parent;
1034         struct soc_camera_host *ici = to_soc_camera_host(dev);
1035         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1036         int ret, k, n;
1037         int formats = 0;
1038         struct sh_mobile_ceu_cam *cam;
1039         enum v4l2_mbus_pixelcode code;
1040         const struct soc_mbus_pixelfmt *fmt;
1041
1042         ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
1043         if (ret < 0)
1044                 /* No more formats */
1045                 return 0;
1046
1047         fmt = soc_mbus_get_fmtdesc(code);
1048         if (!fmt) {
1049                 dev_warn(dev, "unsupported format code #%u: %d\n", idx, code);
1050                 return 0;
1051         }
1052
1053         if (!pcdev->pdata->csi2) {
1054                 /* Are there any restrictions in the CSI-2 case? */
1055                 ret = sh_mobile_ceu_try_bus_param(icd, fmt->bits_per_sample);
1056                 if (ret < 0)
1057                         return 0;
1058         }
1059
1060         if (!icd->host_priv) {
1061                 struct v4l2_mbus_framefmt mf;
1062                 struct v4l2_rect rect;
1063                 int shift = 0;
1064
1065                 /* Add our control */
1066                 v4l2_ctrl_new_std(&icd->ctrl_handler, &sh_mobile_ceu_ctrl_ops,
1067                                   V4L2_CID_SHARPNESS, 0, 1, 1, 0);
1068                 if (icd->ctrl_handler.error)
1069                         return icd->ctrl_handler.error;
1070
1071                 /* FIXME: subwindow is lost between close / open */
1072
1073                 /* Cache current client geometry */
1074                 ret = client_g_rect(sd, &rect);
1075                 if (ret < 0)
1076                         return ret;
1077
1078                 /* First time */
1079                 ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
1080                 if (ret < 0)
1081                         return ret;
1082
1083                 /*
1084                  * All currently existing CEU implementations support 2560x1920
1085                  * or larger frames. If the sensor is proposing too big a frame,
1086                  * don't bother with possibly supportred by the CEU larger
1087                  * sizes, just try VGA multiples. If needed, this can be
1088                  * adjusted in the future.
1089                  */
1090                 while ((mf.width > pcdev->max_width ||
1091                         mf.height > pcdev->max_height) && shift < 4) {
1092                         /* Try 2560x1920, 1280x960, 640x480, 320x240 */
1093                         mf.width        = 2560 >> shift;
1094                         mf.height       = 1920 >> shift;
1095                         ret = v4l2_device_call_until_err(sd->v4l2_dev,
1096                                         soc_camera_grp_id(icd), video,
1097                                         s_mbus_fmt, &mf);
1098                         if (ret < 0)
1099                                 return ret;
1100                         shift++;
1101                 }
1102
1103                 if (shift == 4) {
1104                         dev_err(dev, "Failed to configure the client below %ux%x\n",
1105                                 mf.width, mf.height);
1106                         return -EIO;
1107                 }
1108
1109                 dev_geo(dev, "camera fmt %ux%u\n", mf.width, mf.height);
1110
1111                 cam = kzalloc(sizeof(*cam), GFP_KERNEL);
1112                 if (!cam)
1113                         return -ENOMEM;
1114
1115                 /* We are called with current camera crop, initialise subrect with it */
1116                 cam->rect       = rect;
1117                 cam->subrect    = rect;
1118
1119                 cam->width      = mf.width;
1120                 cam->height     = mf.height;
1121
1122                 icd->host_priv = cam;
1123         } else {
1124                 cam = icd->host_priv;
1125         }
1126
1127         /* Beginning of a pass */
1128         if (!idx)
1129                 cam->extra_fmt = NULL;
1130
1131         switch (code) {
1132         case V4L2_MBUS_FMT_UYVY8_2X8:
1133         case V4L2_MBUS_FMT_VYUY8_2X8:
1134         case V4L2_MBUS_FMT_YUYV8_2X8:
1135         case V4L2_MBUS_FMT_YVYU8_2X8:
1136                 if (cam->extra_fmt)
1137                         break;
1138
1139                 /*
1140                  * Our case is simple so far: for any of the above four camera
1141                  * formats we add all our four synthesized NV* formats, so,
1142                  * just marking the device with a single flag suffices. If
1143                  * the format generation rules are more complex, you would have
1144                  * to actually hang your already added / counted formats onto
1145                  * the host_priv pointer and check whether the format you're
1146                  * going to add now is already there.
1147                  */
1148                 cam->extra_fmt = sh_mobile_ceu_formats;
1149
1150                 n = ARRAY_SIZE(sh_mobile_ceu_formats);
1151                 formats += n;
1152                 for (k = 0; xlate && k < n; k++) {
1153                         xlate->host_fmt = &sh_mobile_ceu_formats[k];
1154                         xlate->code     = code;
1155                         xlate++;
1156                         dev_dbg(dev, "Providing format %s using code %d\n",
1157                                 sh_mobile_ceu_formats[k].name, code);
1158                 }
1159                 break;
1160         default:
1161                 if (!sh_mobile_ceu_packing_supported(fmt))
1162                         return 0;
1163         }
1164
1165         /* Generic pass-through */
1166         formats++;
1167         if (xlate) {
1168                 xlate->host_fmt = fmt;
1169                 xlate->code     = code;
1170                 xlate++;
1171                 dev_dbg(dev, "Providing format %s in pass-through mode\n",
1172                         fmt->name);
1173         }
1174
1175         return formats;
1176 }
1177
1178 static void sh_mobile_ceu_put_formats(struct soc_camera_device *icd)
1179 {
1180         kfree(icd->host_priv);
1181         icd->host_priv = NULL;
1182 }
1183
1184 /* Check if any dimension of r1 is smaller than respective one of r2 */
1185 static bool is_smaller(struct v4l2_rect *r1, struct v4l2_rect *r2)
1186 {
1187         return r1->width < r2->width || r1->height < r2->height;
1188 }
1189
1190 /* Check if r1 fails to cover r2 */
1191 static bool is_inside(struct v4l2_rect *r1, struct v4l2_rect *r2)
1192 {
1193         return r1->left > r2->left || r1->top > r2->top ||
1194                 r1->left + r1->width < r2->left + r2->width ||
1195                 r1->top + r1->height < r2->top + r2->height;
1196 }
1197
1198 static unsigned int scale_down(unsigned int size, unsigned int scale)
1199 {
1200         return (size * 4096 + scale / 2) / scale;
1201 }
1202
1203 static unsigned int calc_generic_scale(unsigned int input, unsigned int output)
1204 {
1205         return (input * 4096 + output / 2) / output;
1206 }
1207
1208 /* Get and store current client crop */
1209 static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect)
1210 {
1211         struct v4l2_crop crop;
1212         struct v4l2_cropcap cap;
1213         int ret;
1214
1215         crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1216
1217         ret = v4l2_subdev_call(sd, video, g_crop, &crop);
1218         if (!ret) {
1219                 *rect = crop.c;
1220                 return ret;
1221         }
1222
1223         /* Camera driver doesn't support .g_crop(), assume default rectangle */
1224         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1225
1226         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1227         if (!ret)
1228                 *rect = cap.defrect;
1229
1230         return ret;
1231 }
1232
1233 /* Client crop has changed, update our sub-rectangle to remain within the area */
1234 static void update_subrect(struct sh_mobile_ceu_cam *cam)
1235 {
1236         struct v4l2_rect *rect = &cam->rect, *subrect = &cam->subrect;
1237
1238         if (rect->width < subrect->width)
1239                 subrect->width = rect->width;
1240
1241         if (rect->height < subrect->height)
1242                 subrect->height = rect->height;
1243
1244         if (rect->left > subrect->left)
1245                 subrect->left = rect->left;
1246         else if (rect->left + rect->width >
1247                  subrect->left + subrect->width)
1248                 subrect->left = rect->left + rect->width -
1249                         subrect->width;
1250
1251         if (rect->top > subrect->top)
1252                 subrect->top = rect->top;
1253         else if (rect->top + rect->height >
1254                  subrect->top + subrect->height)
1255                 subrect->top = rect->top + rect->height -
1256                         subrect->height;
1257 }
1258
1259 /*
1260  * The common for both scaling and cropping iterative approach is:
1261  * 1. try if the client can produce exactly what requested by the user
1262  * 2. if (1) failed, try to double the client image until we get one big enough
1263  * 3. if (2) failed, try to request the maximum image
1264  */
1265 static int client_s_crop(struct soc_camera_device *icd, struct v4l2_crop *crop,
1266                          struct v4l2_crop *cam_crop)
1267 {
1268         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1269         struct v4l2_rect *rect = &crop->c, *cam_rect = &cam_crop->c;
1270         struct device *dev = sd->v4l2_dev->dev;
1271         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1272         struct v4l2_cropcap cap;
1273         int ret;
1274         unsigned int width, height;
1275
1276         v4l2_subdev_call(sd, video, s_crop, crop);
1277         ret = client_g_rect(sd, cam_rect);
1278         if (ret < 0)
1279                 return ret;
1280
1281         /*
1282          * Now cam_crop contains the current camera input rectangle, and it must
1283          * be within camera cropcap bounds
1284          */
1285         if (!memcmp(rect, cam_rect, sizeof(*rect))) {
1286                 /* Even if camera S_CROP failed, but camera rectangle matches */
1287                 dev_dbg(dev, "Camera S_CROP successful for %dx%d@%d:%d\n",
1288                         rect->width, rect->height, rect->left, rect->top);
1289                 cam->rect = *cam_rect;
1290                 return 0;
1291         }
1292
1293         /* Try to fix cropping, that camera hasn't managed to set */
1294         dev_geo(dev, "Fix camera S_CROP for %dx%d@%d:%d to %dx%d@%d:%d\n",
1295                 cam_rect->width, cam_rect->height,
1296                 cam_rect->left, cam_rect->top,
1297                 rect->width, rect->height, rect->left, rect->top);
1298
1299         /* We need sensor maximum rectangle */
1300         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1301         if (ret < 0)
1302                 return ret;
1303
1304         /* Put user requested rectangle within sensor bounds */
1305         soc_camera_limit_side(&rect->left, &rect->width, cap.bounds.left, 2,
1306                               cap.bounds.width);
1307         soc_camera_limit_side(&rect->top, &rect->height, cap.bounds.top, 4,
1308                               cap.bounds.height);
1309
1310         /*
1311          * Popular special case - some cameras can only handle fixed sizes like
1312          * QVGA, VGA,... Take care to avoid infinite loop.
1313          */
1314         width = max(cam_rect->width, 2);
1315         height = max(cam_rect->height, 2);
1316
1317         /*
1318          * Loop as long as sensor is not covering the requested rectangle and
1319          * is still within its bounds
1320          */
1321         while (!ret && (is_smaller(cam_rect, rect) ||
1322                         is_inside(cam_rect, rect)) &&
1323                (cap.bounds.width > width || cap.bounds.height > height)) {
1324
1325                 width *= 2;
1326                 height *= 2;
1327
1328                 cam_rect->width = width;
1329                 cam_rect->height = height;
1330
1331                 /*
1332                  * We do not know what capabilities the camera has to set up
1333                  * left and top borders. We could try to be smarter in iterating
1334                  * them, e.g., if camera current left is to the right of the
1335                  * target left, set it to the middle point between the current
1336                  * left and minimum left. But that would add too much
1337                  * complexity: we would have to iterate each border separately.
1338                  * Instead we just drop to the left and top bounds.
1339                  */
1340                 if (cam_rect->left > rect->left)
1341                         cam_rect->left = cap.bounds.left;
1342
1343                 if (cam_rect->left + cam_rect->width < rect->left + rect->width)
1344                         cam_rect->width = rect->left + rect->width -
1345                                 cam_rect->left;
1346
1347                 if (cam_rect->top > rect->top)
1348                         cam_rect->top = cap.bounds.top;
1349
1350                 if (cam_rect->top + cam_rect->height < rect->top + rect->height)
1351                         cam_rect->height = rect->top + rect->height -
1352                                 cam_rect->top;
1353
1354                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1355                 ret = client_g_rect(sd, cam_rect);
1356                 dev_geo(dev, "Camera S_CROP %d for %dx%d@%d:%d\n", ret,
1357                         cam_rect->width, cam_rect->height,
1358                         cam_rect->left, cam_rect->top);
1359         }
1360
1361         /* S_CROP must not modify the rectangle */
1362         if (is_smaller(cam_rect, rect) || is_inside(cam_rect, rect)) {
1363                 /*
1364                  * The camera failed to configure a suitable cropping,
1365                  * we cannot use the current rectangle, set to max
1366                  */
1367                 *cam_rect = cap.bounds;
1368                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1369                 ret = client_g_rect(sd, cam_rect);
1370                 dev_geo(dev, "Camera S_CROP %d for max %dx%d@%d:%d\n", ret,
1371                         cam_rect->width, cam_rect->height,
1372                         cam_rect->left, cam_rect->top);
1373         }
1374
1375         if (!ret) {
1376                 cam->rect = *cam_rect;
1377                 update_subrect(cam);
1378         }
1379
1380         return ret;
1381 }
1382
1383 /* Iterative s_mbus_fmt, also updates cached client crop on success */
1384 static int client_s_fmt(struct soc_camera_device *icd,
1385                         struct v4l2_mbus_framefmt *mf, bool ceu_can_scale)
1386 {
1387         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1388         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1389         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1390         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1391         struct device *dev = icd->parent;
1392         unsigned int width = mf->width, height = mf->height, tmp_w, tmp_h;
1393         unsigned int max_width, max_height;
1394         struct v4l2_cropcap cap;
1395         bool ceu_1to1;
1396         int ret;
1397
1398         ret = v4l2_device_call_until_err(sd->v4l2_dev,
1399                                          soc_camera_grp_id(icd), video,
1400                                          s_mbus_fmt, mf);
1401         if (ret < 0)
1402                 return ret;
1403
1404         dev_geo(dev, "camera scaled to %ux%u\n", mf->width, mf->height);
1405
1406         if (width == mf->width && height == mf->height) {
1407                 /* Perfect! The client has done it all. */
1408                 ceu_1to1 = true;
1409                 goto update_cache;
1410         }
1411
1412         ceu_1to1 = false;
1413         if (!ceu_can_scale)
1414                 goto update_cache;
1415
1416         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1417
1418         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1419         if (ret < 0)
1420                 return ret;
1421
1422         max_width = min(cap.bounds.width, pcdev->max_width);
1423         max_height = min(cap.bounds.height, pcdev->max_height);
1424
1425         /* Camera set a format, but geometry is not precise, try to improve */
1426         tmp_w = mf->width;
1427         tmp_h = mf->height;
1428
1429         /* width <= max_width && height <= max_height - guaranteed by try_fmt */
1430         while ((width > tmp_w || height > tmp_h) &&
1431                tmp_w < max_width && tmp_h < max_height) {
1432                 tmp_w = min(2 * tmp_w, max_width);
1433                 tmp_h = min(2 * tmp_h, max_height);
1434                 mf->width = tmp_w;
1435                 mf->height = tmp_h;
1436                 ret = v4l2_device_call_until_err(sd->v4l2_dev,
1437                                         soc_camera_grp_id(icd), video,
1438                                         s_mbus_fmt, mf);
1439                 dev_geo(dev, "Camera scaled to %ux%u\n",
1440                         mf->width, mf->height);
1441                 if (ret < 0) {
1442                         /* This shouldn't happen */
1443                         dev_err(dev, "Client failed to set format: %d\n", ret);
1444                         return ret;
1445                 }
1446         }
1447
1448 update_cache:
1449         /* Update cache */
1450         ret = client_g_rect(sd, &cam->rect);
1451         if (ret < 0)
1452                 return ret;
1453
1454         if (ceu_1to1)
1455                 cam->subrect = cam->rect;
1456         else
1457                 update_subrect(cam);
1458
1459         return 0;
1460 }
1461
1462 /**
1463  * @width       - on output: user width, mapped back to input
1464  * @height      - on output: user height, mapped back to input
1465  * @mf          - in- / output camera output window
1466  */
1467 static int client_scale(struct soc_camera_device *icd,
1468                         struct v4l2_mbus_framefmt *mf,
1469                         unsigned int *width, unsigned int *height,
1470                         bool ceu_can_scale)
1471 {
1472         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1473         struct device *dev = icd->parent;
1474         struct v4l2_mbus_framefmt mf_tmp = *mf;
1475         unsigned int scale_h, scale_v;
1476         int ret;
1477
1478         /*
1479          * 5. Apply iterative camera S_FMT for camera user window (also updates
1480          *    client crop cache and the imaginary sub-rectangle).
1481          */
1482         ret = client_s_fmt(icd, &mf_tmp, ceu_can_scale);
1483         if (ret < 0)
1484                 return ret;
1485
1486         dev_geo(dev, "5: camera scaled to %ux%u\n",
1487                 mf_tmp.width, mf_tmp.height);
1488
1489         /* 6. Retrieve camera output window (g_fmt) */
1490
1491         /* unneeded - it is already in "mf_tmp" */
1492
1493         /* 7. Calculate new client scales. */
1494         scale_h = calc_generic_scale(cam->rect.width, mf_tmp.width);
1495         scale_v = calc_generic_scale(cam->rect.height, mf_tmp.height);
1496
1497         mf->width       = mf_tmp.width;
1498         mf->height      = mf_tmp.height;
1499         mf->colorspace  = mf_tmp.colorspace;
1500
1501         /*
1502          * 8. Calculate new CEU crop - apply camera scales to previously
1503          *    updated "effective" crop.
1504          */
1505         *width = scale_down(cam->subrect.width, scale_h);
1506         *height = scale_down(cam->subrect.height, scale_v);
1507
1508         dev_geo(dev, "8: new client sub-window %ux%u\n", *width, *height);
1509
1510         return 0;
1511 }
1512
1513 /*
1514  * CEU can scale and crop, but we don't want to waste bandwidth and kill the
1515  * framerate by always requesting the maximum image from the client. See
1516  * Documentation/video4linux/sh_mobile_ceu_camera.txt for a description of
1517  * scaling and cropping algorithms and for the meaning of referenced here steps.
1518  */
1519 static int sh_mobile_ceu_set_crop(struct soc_camera_device *icd,
1520                                   struct v4l2_crop *a)
1521 {
1522         struct v4l2_rect *rect = &a->c;
1523         struct device *dev = icd->parent;
1524         struct soc_camera_host *ici = to_soc_camera_host(dev);
1525         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1526         struct v4l2_crop cam_crop;
1527         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1528         struct v4l2_rect *cam_rect = &cam_crop.c;
1529         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1530         struct v4l2_mbus_framefmt mf;
1531         unsigned int scale_cam_h, scale_cam_v, scale_ceu_h, scale_ceu_v,
1532                 out_width, out_height;
1533         int interm_width, interm_height;
1534         u32 capsr, cflcr;
1535         int ret;
1536
1537         dev_geo(dev, "S_CROP(%ux%u@%u:%u)\n", rect->width, rect->height,
1538                 rect->left, rect->top);
1539
1540         /* During camera cropping its output window can change too, stop CEU */
1541         capsr = capture_save_reset(pcdev);
1542         dev_dbg(dev, "CAPSR 0x%x, CFLCR 0x%x\n", capsr, pcdev->cflcr);
1543
1544         /*
1545          * 1. - 2. Apply iterative camera S_CROP for new input window, read back
1546          * actual camera rectangle.
1547          */
1548         ret = client_s_crop(icd, a, &cam_crop);
1549         if (ret < 0)
1550                 return ret;
1551
1552         dev_geo(dev, "1-2: camera cropped to %ux%u@%u:%u\n",
1553                 cam_rect->width, cam_rect->height,
1554                 cam_rect->left, cam_rect->top);
1555
1556         /* On success cam_crop contains current camera crop */
1557
1558         /* 3. Retrieve camera output window */
1559         ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
1560         if (ret < 0)
1561                 return ret;
1562
1563         if (mf.width > pcdev->max_width || mf.height > pcdev->max_height)
1564                 return -EINVAL;
1565
1566         /* 4. Calculate camera scales */
1567         scale_cam_h     = calc_generic_scale(cam_rect->width, mf.width);
1568         scale_cam_v     = calc_generic_scale(cam_rect->height, mf.height);
1569
1570         /* Calculate intermediate window */
1571         interm_width    = scale_down(rect->width, scale_cam_h);
1572         interm_height   = scale_down(rect->height, scale_cam_v);
1573
1574         if (interm_width < icd->user_width) {
1575                 u32 new_scale_h;
1576
1577                 new_scale_h = calc_generic_scale(rect->width, icd->user_width);
1578
1579                 mf.width = scale_down(cam_rect->width, new_scale_h);
1580         }
1581
1582         if (interm_height < icd->user_height) {
1583                 u32 new_scale_v;
1584
1585                 new_scale_v = calc_generic_scale(rect->height, icd->user_height);
1586
1587                 mf.height = scale_down(cam_rect->height, new_scale_v);
1588         }
1589
1590         if (interm_width < icd->user_width || interm_height < icd->user_height) {
1591                 ret = v4l2_device_call_until_err(sd->v4l2_dev,
1592                                         soc_camera_grp_id(icd), video,
1593                                         s_mbus_fmt, &mf);
1594                 if (ret < 0)
1595                         return ret;
1596
1597                 dev_geo(dev, "New camera output %ux%u\n", mf.width, mf.height);
1598                 scale_cam_h     = calc_generic_scale(cam_rect->width, mf.width);
1599                 scale_cam_v     = calc_generic_scale(cam_rect->height, mf.height);
1600                 interm_width    = scale_down(rect->width, scale_cam_h);
1601                 interm_height   = scale_down(rect->height, scale_cam_v);
1602         }
1603
1604         /* Cache camera output window */
1605         cam->width      = mf.width;
1606         cam->height     = mf.height;
1607
1608         if (pcdev->image_mode) {
1609                 out_width       = min(interm_width, icd->user_width);
1610                 out_height      = min(interm_height, icd->user_height);
1611         } else {
1612                 out_width       = interm_width;
1613                 out_height      = interm_height;
1614         }
1615
1616         /*
1617          * 5. Calculate CEU scales from camera scales from results of (5) and
1618          *    the user window
1619          */
1620         scale_ceu_h     = calc_scale(interm_width, &out_width);
1621         scale_ceu_v     = calc_scale(interm_height, &out_height);
1622
1623         dev_geo(dev, "5: CEU scales %u:%u\n", scale_ceu_h, scale_ceu_v);
1624
1625         /* Apply CEU scales. */
1626         cflcr = scale_ceu_h | (scale_ceu_v << 16);
1627         if (cflcr != pcdev->cflcr) {
1628                 pcdev->cflcr = cflcr;
1629                 ceu_write(pcdev, CFLCR, cflcr);
1630         }
1631
1632         icd->user_width  = out_width & ~3;
1633         icd->user_height = out_height & ~3;
1634         /* Offsets are applied at the CEU scaling filter input */
1635         cam->ceu_left    = scale_down(rect->left - cam_rect->left, scale_cam_h) & ~1;
1636         cam->ceu_top     = scale_down(rect->top - cam_rect->top, scale_cam_v) & ~1;
1637
1638         /* 6. Use CEU cropping to crop to the new window. */
1639         sh_mobile_ceu_set_rect(icd);
1640
1641         cam->subrect = *rect;
1642
1643         dev_geo(dev, "6: CEU cropped to %ux%u@%u:%u\n",
1644                 icd->user_width, icd->user_height,
1645                 cam->ceu_left, cam->ceu_top);
1646
1647         /* Restore capture. The CE bit can be cleared by the hardware */
1648         if (pcdev->active)
1649                 capsr |= 1;
1650         capture_restore(pcdev, capsr);
1651
1652         /* Even if only camera cropping succeeded */
1653         return ret;
1654 }
1655
1656 static int sh_mobile_ceu_get_crop(struct soc_camera_device *icd,
1657                                   struct v4l2_crop *a)
1658 {
1659         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1660
1661         a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1662         a->c = cam->subrect;
1663
1664         return 0;
1665 }
1666
1667 /*
1668  * Calculate real client output window by applying new scales to the current
1669  * client crop. New scales are calculated from the requested output format and
1670  * CEU crop, mapped backed onto the client input (subrect).
1671  */
1672 static void calculate_client_output(struct soc_camera_device *icd,
1673                 const struct v4l2_pix_format *pix, struct v4l2_mbus_framefmt *mf)
1674 {
1675         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1676         struct device *dev = icd->parent;
1677         struct v4l2_rect *cam_subrect = &cam->subrect;
1678         unsigned int scale_v, scale_h;
1679
1680         if (cam_subrect->width == cam->rect.width &&
1681             cam_subrect->height == cam->rect.height) {
1682                 /* No sub-cropping */
1683                 mf->width       = pix->width;
1684                 mf->height      = pix->height;
1685                 return;
1686         }
1687
1688         /* 1.-2. Current camera scales and subwin - cached. */
1689
1690         dev_geo(dev, "2: subwin %ux%u@%u:%u\n",
1691                 cam_subrect->width, cam_subrect->height,
1692                 cam_subrect->left, cam_subrect->top);
1693
1694         /*
1695          * 3. Calculate new combined scales from input sub-window to requested
1696          *    user window.
1697          */
1698
1699         /*
1700          * TODO: CEU cannot scale images larger than VGA to smaller than SubQCIF
1701          * (128x96) or larger than VGA
1702          */
1703         scale_h = calc_generic_scale(cam_subrect->width, pix->width);
1704         scale_v = calc_generic_scale(cam_subrect->height, pix->height);
1705
1706         dev_geo(dev, "3: scales %u:%u\n", scale_h, scale_v);
1707
1708         /*
1709          * 4. Calculate desired client output window by applying combined scales
1710          *    to client (real) input window.
1711          */
1712         mf->width       = scale_down(cam->rect.width, scale_h);
1713         mf->height      = scale_down(cam->rect.height, scale_v);
1714 }
1715
1716 /* Similar to set_crop multistage iterative algorithm */
1717 static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
1718                                  struct v4l2_format *f)
1719 {
1720         struct device *dev = icd->parent;
1721         struct soc_camera_host *ici = to_soc_camera_host(dev);
1722         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1723         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1724         struct v4l2_pix_format *pix = &f->fmt.pix;
1725         struct v4l2_mbus_framefmt mf;
1726         __u32 pixfmt = pix->pixelformat;
1727         const struct soc_camera_format_xlate *xlate;
1728         /* Keep Compiler Happy */
1729         unsigned int ceu_sub_width = 0, ceu_sub_height = 0;
1730         u16 scale_v, scale_h;
1731         int ret;
1732         bool image_mode;
1733         enum v4l2_field field;
1734
1735         switch (pix->field) {
1736         default:
1737                 pix->field = V4L2_FIELD_NONE;
1738                 /* fall-through */
1739         case V4L2_FIELD_INTERLACED_TB:
1740         case V4L2_FIELD_INTERLACED_BT:
1741         case V4L2_FIELD_NONE:
1742                 field = pix->field;
1743                 break;
1744         case V4L2_FIELD_INTERLACED:
1745                 field = V4L2_FIELD_INTERLACED_TB;
1746                 break;
1747         }
1748
1749         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1750         if (!xlate) {
1751                 dev_warn(dev, "Format %x not found\n", pixfmt);
1752                 return -EINVAL;
1753         }
1754
1755         /* 1.-4. Calculate desired client output geometry */
1756         calculate_client_output(icd, pix, &mf);
1757         mf.field        = pix->field;
1758         mf.colorspace   = pix->colorspace;
1759         mf.code         = xlate->code;
1760
1761         switch (pixfmt) {
1762         case V4L2_PIX_FMT_NV12:
1763         case V4L2_PIX_FMT_NV21:
1764         case V4L2_PIX_FMT_NV16:
1765         case V4L2_PIX_FMT_NV61:
1766                 image_mode = true;
1767                 break;
1768         default:
1769                 image_mode = false;
1770         }
1771
1772         dev_geo(dev, "S_FMT(pix=0x%x, fld 0x%x, code 0x%x, %ux%u)\n", pixfmt, mf.field, mf.code,
1773                 pix->width, pix->height);
1774
1775         dev_geo(dev, "4: request camera output %ux%u\n", mf.width, mf.height);
1776
1777         /* 5. - 9. */
1778         ret = client_scale(icd, &mf, &ceu_sub_width, &ceu_sub_height,
1779                            image_mode && V4L2_FIELD_NONE == field);
1780
1781         dev_geo(dev, "5-9: client scale return %d\n", ret);
1782
1783         /* Done with the camera. Now see if we can improve the result */
1784
1785         dev_geo(dev, "fmt %ux%u, requested %ux%u\n",
1786                 mf.width, mf.height, pix->width, pix->height);
1787         if (ret < 0)
1788                 return ret;
1789
1790         if (mf.code != xlate->code)
1791                 return -EINVAL;
1792
1793         /* 9. Prepare CEU crop */
1794         cam->width = mf.width;
1795         cam->height = mf.height;
1796
1797         /* 10. Use CEU scaling to scale to the requested user window. */
1798
1799         /* We cannot scale up */
1800         if (pix->width > ceu_sub_width)
1801                 ceu_sub_width = pix->width;
1802
1803         if (pix->height > ceu_sub_height)
1804                 ceu_sub_height = pix->height;
1805
1806         pix->colorspace = mf.colorspace;
1807
1808         if (image_mode) {
1809                 /* Scale pix->{width x height} down to width x height */
1810                 scale_h         = calc_scale(ceu_sub_width, &pix->width);
1811                 scale_v         = calc_scale(ceu_sub_height, &pix->height);
1812         } else {
1813                 pix->width      = ceu_sub_width;
1814                 pix->height     = ceu_sub_height;
1815                 scale_h         = 0;
1816                 scale_v         = 0;
1817         }
1818
1819         pcdev->cflcr = scale_h | (scale_v << 16);
1820
1821         /*
1822          * We have calculated CFLCR, the actual configuration will be performed
1823          * in sh_mobile_ceu_set_bus_param()
1824          */
1825
1826         dev_geo(dev, "10: W: %u : 0x%x = %u, H: %u : 0x%x = %u\n",
1827                 ceu_sub_width, scale_h, pix->width,
1828                 ceu_sub_height, scale_v, pix->height);
1829
1830         cam->code               = xlate->code;
1831         icd->current_fmt        = xlate;
1832
1833         pcdev->field = field;
1834         pcdev->image_mode = image_mode;
1835
1836         /* CFSZR requirement */
1837         pix->width      &= ~3;
1838         pix->height     &= ~3;
1839
1840         return 0;
1841 }
1842
1843 #define CEU_CHDW_MAX    8188U   /* Maximum line stride */
1844
1845 static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
1846                                  struct v4l2_format *f)
1847 {
1848         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1849         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1850         const struct soc_camera_format_xlate *xlate;
1851         struct v4l2_pix_format *pix = &f->fmt.pix;
1852         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1853         struct v4l2_mbus_framefmt mf;
1854         __u32 pixfmt = pix->pixelformat;
1855         int width, height;
1856         int ret;
1857
1858         dev_geo(icd->parent, "TRY_FMT(pix=0x%x, %ux%u)\n",
1859                  pixfmt, pix->width, pix->height);
1860
1861         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1862         if (!xlate) {
1863                 xlate = icd->current_fmt;
1864                 dev_dbg(icd->parent, "Format %x not found, keeping %x\n",
1865                         pixfmt, xlate->host_fmt->fourcc);
1866                 pixfmt = xlate->host_fmt->fourcc;
1867                 pix->pixelformat = pixfmt;
1868                 pix->colorspace = icd->colorspace;
1869         }
1870
1871         /* FIXME: calculate using depth and bus width */
1872
1873         /* CFSZR requires height and width to be 4-pixel aligned */
1874         v4l_bound_align_image(&pix->width, 2, pcdev->max_width, 2,
1875                               &pix->height, 4, pcdev->max_height, 2, 0);
1876
1877         width = pix->width;
1878         height = pix->height;
1879
1880         /* limit to sensor capabilities */
1881         mf.width        = pix->width;
1882         mf.height       = pix->height;
1883         mf.field        = pix->field;
1884         mf.code         = xlate->code;
1885         mf.colorspace   = pix->colorspace;
1886
1887         ret = v4l2_device_call_until_err(sd->v4l2_dev, soc_camera_grp_id(icd),
1888                                          video, try_mbus_fmt, &mf);
1889         if (ret < 0)
1890                 return ret;
1891
1892         pix->width      = mf.width;
1893         pix->height     = mf.height;
1894         pix->field      = mf.field;
1895         pix->colorspace = mf.colorspace;
1896
1897         switch (pixfmt) {
1898         case V4L2_PIX_FMT_NV12:
1899         case V4L2_PIX_FMT_NV21:
1900         case V4L2_PIX_FMT_NV16:
1901         case V4L2_PIX_FMT_NV61:
1902                 /* FIXME: check against rect_max after converting soc-camera */
1903                 /* We can scale precisely, need a bigger image from camera */
1904                 if (pix->width < width || pix->height < height) {
1905                         /*
1906                          * We presume, the sensor behaves sanely, i.e., if
1907                          * requested a bigger rectangle, it will not return a
1908                          * smaller one.
1909                          */
1910                         mf.width = pcdev->max_width;
1911                         mf.height = pcdev->max_height;
1912                         ret = v4l2_device_call_until_err(sd->v4l2_dev,
1913                                         soc_camera_grp_id(icd), video,
1914                                         try_mbus_fmt, &mf);
1915                         if (ret < 0) {
1916                                 /* Shouldn't actually happen... */
1917                                 dev_err(icd->parent,
1918                                         "FIXME: client try_fmt() = %d\n", ret);
1919                                 return ret;
1920                         }
1921                 }
1922                 /* We will scale exactly */
1923                 if (mf.width > width)
1924                         pix->width = width;
1925                 if (mf.height > height)
1926                         pix->height = height;
1927
1928                 pix->bytesperline = max(pix->bytesperline, pix->width);
1929                 pix->bytesperline = min(pix->bytesperline, CEU_CHDW_MAX);
1930                 pix->bytesperline &= ~3;
1931                 break;
1932
1933         default:
1934                 /* Configurable stride isn't supported in pass-through mode. */
1935                 pix->bytesperline  = 0;
1936         }
1937
1938         pix->width      &= ~3;
1939         pix->height     &= ~3;
1940         pix->sizeimage  = 0;
1941
1942         dev_geo(icd->parent, "%s(): return %d, fmt 0x%x, %ux%u\n",
1943                 __func__, ret, pix->pixelformat, pix->width, pix->height);
1944
1945         return ret;
1946 }
1947
1948 static int sh_mobile_ceu_set_livecrop(struct soc_camera_device *icd,
1949                                       struct v4l2_crop *a)
1950 {
1951         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1952         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1953         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1954         u32 out_width = icd->user_width, out_height = icd->user_height;
1955         int ret;
1956
1957         /* Freeze queue */
1958         pcdev->frozen = 1;
1959         /* Wait for frame */
1960         ret = wait_for_completion_interruptible(&pcdev->complete);
1961         /* Stop the client */
1962         ret = v4l2_subdev_call(sd, video, s_stream, 0);
1963         if (ret < 0)
1964                 dev_warn(icd->parent,
1965                          "Client failed to stop the stream: %d\n", ret);
1966         else
1967                 /* Do the crop, if it fails, there's nothing more we can do */
1968                 sh_mobile_ceu_set_crop(icd, a);
1969
1970         dev_geo(icd->parent, "Output after crop: %ux%u\n", icd->user_width, icd->user_height);
1971
1972         if (icd->user_width != out_width || icd->user_height != out_height) {
1973                 struct v4l2_format f = {
1974                         .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1975                         .fmt.pix        = {
1976                                 .width          = out_width,
1977                                 .height         = out_height,
1978                                 .pixelformat    = icd->current_fmt->host_fmt->fourcc,
1979                                 .field          = pcdev->field,
1980                                 .colorspace     = icd->colorspace,
1981                         },
1982                 };
1983                 ret = sh_mobile_ceu_set_fmt(icd, &f);
1984                 if (!ret && (out_width != f.fmt.pix.width ||
1985                              out_height != f.fmt.pix.height))
1986                         ret = -EINVAL;
1987                 if (!ret) {
1988                         icd->user_width         = out_width & ~3;
1989                         icd->user_height        = out_height & ~3;
1990                         ret = sh_mobile_ceu_set_bus_param(icd);
1991                 }
1992         }
1993
1994         /* Thaw the queue */
1995         pcdev->frozen = 0;
1996         spin_lock_irq(&pcdev->lock);
1997         sh_mobile_ceu_capture(pcdev);
1998         spin_unlock_irq(&pcdev->lock);
1999         /* Start the client */
2000         ret = v4l2_subdev_call(sd, video, s_stream, 1);
2001         return ret;
2002 }
2003
2004 static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
2005 {
2006         struct soc_camera_device *icd = file->private_data;
2007
2008         return vb2_poll(&icd->vb2_vidq, file, pt);
2009 }
2010
2011 static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
2012                                   struct v4l2_capability *cap)
2013 {
2014         strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
2015         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
2016         return 0;
2017 }
2018
2019 static int sh_mobile_ceu_init_videobuf(struct vb2_queue *q,
2020                                        struct soc_camera_device *icd)
2021 {
2022         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2023         q->io_modes = VB2_MMAP | VB2_USERPTR;
2024         q->drv_priv = icd;
2025         q->ops = &sh_mobile_ceu_videobuf_ops;
2026         q->mem_ops = &vb2_dma_contig_memops;
2027         q->buf_struct_size = sizeof(struct sh_mobile_ceu_buffer);
2028
2029         return vb2_queue_init(q);
2030 }
2031
2032 static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
2033         .owner          = THIS_MODULE,
2034         .add            = sh_mobile_ceu_add_device,
2035         .remove         = sh_mobile_ceu_remove_device,
2036         .get_formats    = sh_mobile_ceu_get_formats,
2037         .put_formats    = sh_mobile_ceu_put_formats,
2038         .get_crop       = sh_mobile_ceu_get_crop,
2039         .set_crop       = sh_mobile_ceu_set_crop,
2040         .set_livecrop   = sh_mobile_ceu_set_livecrop,
2041         .set_fmt        = sh_mobile_ceu_set_fmt,
2042         .try_fmt        = sh_mobile_ceu_try_fmt,
2043         .poll           = sh_mobile_ceu_poll,
2044         .querycap       = sh_mobile_ceu_querycap,
2045         .set_bus_param  = sh_mobile_ceu_set_bus_param,
2046         .init_videobuf2 = sh_mobile_ceu_init_videobuf,
2047 };
2048
2049 struct bus_wait {
2050         struct notifier_block   notifier;
2051         struct completion       completion;
2052         struct device           *dev;
2053 };
2054
2055 static int bus_notify(struct notifier_block *nb,
2056                       unsigned long action, void *data)
2057 {
2058         struct device *dev = data;
2059         struct bus_wait *wait = container_of(nb, struct bus_wait, notifier);
2060
2061         if (wait->dev != dev)
2062                 return NOTIFY_DONE;
2063
2064         switch (action) {
2065         case BUS_NOTIFY_UNBOUND_DRIVER:
2066                 /* Protect from module unloading */
2067                 wait_for_completion(&wait->completion);
2068                 return NOTIFY_OK;
2069         }
2070         return NOTIFY_DONE;
2071 }
2072
2073 static int __devinit sh_mobile_ceu_probe(struct platform_device *pdev)
2074 {
2075         struct sh_mobile_ceu_dev *pcdev;
2076         struct resource *res;
2077         void __iomem *base;
2078         unsigned int irq;
2079         int err = 0;
2080         struct bus_wait wait = {
2081                 .completion = COMPLETION_INITIALIZER_ONSTACK(wait.completion),
2082                 .notifier.notifier_call = bus_notify,
2083         };
2084         struct sh_mobile_ceu_companion *csi2;
2085
2086         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2087         irq = platform_get_irq(pdev, 0);
2088         if (!res || (int)irq <= 0) {
2089                 dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
2090                 err = -ENODEV;
2091                 goto exit;
2092         }
2093
2094         pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
2095         if (!pcdev) {
2096                 dev_err(&pdev->dev, "Could not allocate pcdev\n");
2097                 err = -ENOMEM;
2098                 goto exit;
2099         }
2100
2101         INIT_LIST_HEAD(&pcdev->capture);
2102         spin_lock_init(&pcdev->lock);
2103         init_completion(&pcdev->complete);
2104
2105         pcdev->pdata = pdev->dev.platform_data;
2106         if (!pcdev->pdata) {
2107                 err = -EINVAL;
2108                 dev_err(&pdev->dev, "CEU platform data not set.\n");
2109                 goto exit_kfree;
2110         }
2111
2112         pcdev->max_width = pcdev->pdata->max_width ? : 2560;
2113         pcdev->max_height = pcdev->pdata->max_height ? : 1920;
2114
2115         base = ioremap_nocache(res->start, resource_size(res));
2116         if (!base) {
2117                 err = -ENXIO;
2118                 dev_err(&pdev->dev, "Unable to ioremap CEU registers.\n");
2119                 goto exit_kfree;
2120         }
2121
2122         pcdev->irq = irq;
2123         pcdev->base = base;
2124         pcdev->video_limit = 0; /* only enabled if second resource exists */
2125
2126         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
2127         if (res) {
2128                 err = dma_declare_coherent_memory(&pdev->dev, res->start,
2129                                                   res->start,
2130                                                   resource_size(res),
2131                                                   DMA_MEMORY_MAP |
2132                                                   DMA_MEMORY_EXCLUSIVE);
2133                 if (!err) {
2134                         dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
2135                         err = -ENXIO;
2136                         goto exit_iounmap;
2137                 }
2138
2139                 pcdev->video_limit = resource_size(res);
2140         }
2141
2142         /* request irq */
2143         err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED,
2144                           dev_name(&pdev->dev), pcdev);
2145         if (err) {
2146                 dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
2147                 goto exit_release_mem;
2148         }
2149
2150         pm_suspend_ignore_children(&pdev->dev, true);
2151         pm_runtime_enable(&pdev->dev);
2152         pm_runtime_resume(&pdev->dev);
2153
2154         pcdev->ici.priv = pcdev;
2155         pcdev->ici.v4l2_dev.dev = &pdev->dev;
2156         pcdev->ici.nr = pdev->id;
2157         pcdev->ici.drv_name = dev_name(&pdev->dev);
2158         pcdev->ici.ops = &sh_mobile_ceu_host_ops;
2159         pcdev->ici.capabilities = SOCAM_HOST_CAP_STRIDE;
2160
2161         pcdev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
2162         if (IS_ERR(pcdev->alloc_ctx)) {
2163                 err = PTR_ERR(pcdev->alloc_ctx);
2164                 goto exit_free_clk;
2165         }
2166
2167         err = soc_camera_host_register(&pcdev->ici);
2168         if (err)
2169                 goto exit_free_ctx;
2170
2171         /* CSI2 interfacing */
2172         csi2 = pcdev->pdata->csi2;
2173         if (csi2) {
2174                 struct platform_device *csi2_pdev =
2175                         platform_device_alloc("sh-mobile-csi2", csi2->id);
2176                 struct sh_csi2_pdata *csi2_pdata = csi2->platform_data;
2177
2178                 if (!csi2_pdev) {
2179                         err = -ENOMEM;
2180                         goto exit_host_unregister;
2181                 }
2182
2183                 pcdev->csi2_pdev                = csi2_pdev;
2184
2185                 err = platform_device_add_data(csi2_pdev, csi2_pdata, sizeof(*csi2_pdata));
2186                 if (err < 0)
2187                         goto exit_pdev_put;
2188
2189                 csi2_pdata                      = csi2_pdev->dev.platform_data;
2190                 csi2_pdata->v4l2_dev            = &pcdev->ici.v4l2_dev;
2191
2192                 csi2_pdev->resource             = csi2->resource;
2193                 csi2_pdev->num_resources        = csi2->num_resources;
2194
2195                 err = platform_device_add(csi2_pdev);
2196                 if (err < 0)
2197                         goto exit_pdev_put;
2198
2199                 wait.dev = &csi2_pdev->dev;
2200
2201                 err = bus_register_notifier(&platform_bus_type, &wait.notifier);
2202                 if (err < 0)
2203                         goto exit_pdev_unregister;
2204
2205                 /*
2206                  * From this point the driver module will not unload, until
2207                  * we complete the completion.
2208                  */
2209
2210                 if (!csi2_pdev->dev.driver) {
2211                         complete(&wait.completion);
2212                         /* Either too late, or probing failed */
2213                         bus_unregister_notifier(&platform_bus_type, &wait.notifier);
2214                         err = -ENXIO;
2215                         goto exit_pdev_unregister;
2216                 }
2217
2218                 /*
2219                  * The module is still loaded, in the worst case it is hanging
2220                  * in device release on our completion. So, _now_ dereferencing
2221                  * the "owner" is safe!
2222                  */
2223
2224                 err = try_module_get(csi2_pdev->dev.driver->owner);
2225
2226                 /* Let notifier complete, if it has been locked */
2227                 complete(&wait.completion);
2228                 bus_unregister_notifier(&platform_bus_type, &wait.notifier);
2229                 if (!err) {
2230                         err = -ENODEV;
2231                         goto exit_pdev_unregister;
2232                 }
2233         }
2234
2235         return 0;
2236
2237 exit_pdev_unregister:
2238         platform_device_del(pcdev->csi2_pdev);
2239 exit_pdev_put:
2240         pcdev->csi2_pdev->resource = NULL;
2241         platform_device_put(pcdev->csi2_pdev);
2242 exit_host_unregister:
2243         soc_camera_host_unregister(&pcdev->ici);
2244 exit_free_ctx:
2245         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
2246 exit_free_clk:
2247         pm_runtime_disable(&pdev->dev);
2248         free_irq(pcdev->irq, pcdev);
2249 exit_release_mem:
2250         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
2251                 dma_release_declared_memory(&pdev->dev);
2252 exit_iounmap:
2253         iounmap(base);
2254 exit_kfree:
2255         kfree(pcdev);
2256 exit:
2257         return err;
2258 }
2259
2260 static int __devexit sh_mobile_ceu_remove(struct platform_device *pdev)
2261 {
2262         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
2263         struct sh_mobile_ceu_dev *pcdev = container_of(soc_host,
2264                                         struct sh_mobile_ceu_dev, ici);
2265         struct platform_device *csi2_pdev = pcdev->csi2_pdev;
2266
2267         soc_camera_host_unregister(soc_host);
2268         pm_runtime_disable(&pdev->dev);
2269         free_irq(pcdev->irq, pcdev);
2270         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
2271                 dma_release_declared_memory(&pdev->dev);
2272         iounmap(pcdev->base);
2273         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
2274         if (csi2_pdev && csi2_pdev->dev.driver) {
2275                 struct module *csi2_drv = csi2_pdev->dev.driver->owner;
2276                 platform_device_del(csi2_pdev);
2277                 csi2_pdev->resource = NULL;
2278                 platform_device_put(csi2_pdev);
2279                 module_put(csi2_drv);
2280         }
2281         kfree(pcdev);
2282
2283         return 0;
2284 }
2285
2286 static int sh_mobile_ceu_runtime_nop(struct device *dev)
2287 {
2288         /* Runtime PM callback shared between ->runtime_suspend()
2289          * and ->runtime_resume(). Simply returns success.
2290          *
2291          * This driver re-initializes all registers after
2292          * pm_runtime_get_sync() anyway so there is no need
2293          * to save and restore registers here.
2294          */
2295         return 0;
2296 }
2297
2298 static const struct dev_pm_ops sh_mobile_ceu_dev_pm_ops = {
2299         .runtime_suspend = sh_mobile_ceu_runtime_nop,
2300         .runtime_resume = sh_mobile_ceu_runtime_nop,
2301 };
2302
2303 static struct platform_driver sh_mobile_ceu_driver = {
2304         .driver         = {
2305                 .name   = "sh_mobile_ceu",
2306                 .pm     = &sh_mobile_ceu_dev_pm_ops,
2307         },
2308         .probe          = sh_mobile_ceu_probe,
2309         .remove         = __devexit_p(sh_mobile_ceu_remove),
2310 };
2311
2312 static int __init sh_mobile_ceu_init(void)
2313 {
2314         /* Whatever return code */
2315         request_module("sh_mobile_csi2");
2316         return platform_driver_register(&sh_mobile_ceu_driver);
2317 }
2318
2319 static void __exit sh_mobile_ceu_exit(void)
2320 {
2321         platform_driver_unregister(&sh_mobile_ceu_driver);
2322 }
2323
2324 module_init(sh_mobile_ceu_init);
2325 module_exit(sh_mobile_ceu_exit);
2326
2327 MODULE_DESCRIPTION("SuperH Mobile CEU driver");
2328 MODULE_AUTHOR("Magnus Damm");
2329 MODULE_LICENSE("GPL");
2330 MODULE_VERSION("0.0.6");
2331 MODULE_ALIAS("platform:sh_mobile_ceu");