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/videobuf2-dma-contig.h>
  42 #include <media/v4l2-mediabus.h>
  43 #include <media/soc_mediabus.h>
  44
  45 /* register offsets for sh7722 / sh7723 */
  46
  47 #define CAPSR  0x00 /* Capture start register */
  48 #define CAPCR  0x04 /* Capture control register */
  49 #define CAMCR  0x08 /* Capture interface control register */
  50 #define CMCYR  0x0c /* Capture interface cycle  register */
  51 #define CAMOR  0x10 /* Capture interface offset register */
  52 #define CAPWR  0x14 /* Capture interface width register */
  53 #define CAIFR  0x18 /* Capture interface input format register */
  54 #define CSTCR  0x20 /* Camera strobe control register (<= sh7722) */
  55 #define CSECR  0x24 /* Camera strobe emission count register (<= sh7722) */
  56 #define CRCNTR 0x28 /* CEU register control register */
  57 #define CRCMPR 0x2c /* CEU register forcible control register */
  58 #define CFLCR  0x30 /* Capture filter control register */
  59 #define CFSZR  0x34 /* Capture filter size clip register */
  60 #define CDWDR  0x38 /* Capture destination width register */
  61 #define CDAYR  0x3c /* Capture data address Y register */
  62 #define CDACR  0x40 /* Capture data address C register */
  63 #define CDBYR  0x44 /* Capture data bottom-field address Y register */
  64 #define CDBCR  0x48 /* Capture data bottom-field address C register */
  65 #define CBDSR  0x4c /* Capture bundle destination size register */
  66 #define CFWCR  0x5c /* Firewall operation control register */
  67 #define CLFCR  0x60 /* Capture low-pass filter control register */
  68 #define CDOCR  0x64 /* Capture data output control register */
  69 #define CDDCR  0x68 /* Capture data complexity level register */
  70 #define CDDAR  0x6c /* Capture data complexity level address register */
  71 #define CEIER  0x70 /* Capture event interrupt enable register */
  72 #define CETCR  0x74 /* Capture event flag clear register */
  73 #define CSTSR  0x7c /* Capture status register */
  74 #define CSRTR  0x80 /* Capture software reset register */
  75 #define CDSSR  0x84 /* Capture data size register */
  76 #define CDAYR2 0x90 /* Capture data address Y register 2 */
  77 #define CDACR2 0x94 /* Capture data address C register 2 */
  78 #define CDBYR2 0x98 /* Capture data bottom-field address Y register 2 */
  79 #define CDBCR2 0x9c /* Capture data bottom-field address C register 2 */
  80
  81 #undef DEBUG_GEOMETRY
  82 #ifdef DEBUG_GEOMETRY
  83 #define dev_geo dev_info
  84 #else
  85 #define dev_geo dev_dbg
  86 #endif
  87
  88 /* per video frame buffer */
  89 struct sh_mobile_ceu_buffer {
  90         struct vb2_buffer vb; /* v4l buffer must be first */
  91         struct list_head queue;
  92         enum v4l2_mbus_pixelcode code;
  93 };
  94
  95 struct sh_mobile_ceu_dev {
  96         struct soc_camera_host ici;
  97         struct soc_camera_device *icd;
  98
  99         unsigned int irq;
 100         void __iomem *base;
 101         unsigned long video_limit;
 102
 103         spinlock_t lock;                /* Protects video buffer lists */
 104         struct list_head capture;
 105         struct vb2_buffer *active;
 106         struct vb2_alloc_ctx *alloc_ctx;
 107
 108         struct sh_mobile_ceu_info *pdata;
 109         struct completion complete;
 110
 111         u32 cflcr;
 112
 113         enum v4l2_field field;
 114         int sequence;
 115
 116         unsigned int image_mode:1;
 117         unsigned int is_16bit:1;
 118         unsigned int frozen:1;
 119 };
 120
 121 struct sh_mobile_ceu_cam {
 122         /* CEU offsets within scaled by the CEU camera output */
 123         unsigned int ceu_left;
 124         unsigned int ceu_top;
 125         /* Client output, as seen by the CEU */
 126         unsigned int width;
 127         unsigned int height;
 128         /*
 129          * User window from S_CROP / G_CROP, produced by client cropping and
 130          * scaling, CEU scaling and CEU cropping, mapped back onto the client
 131          * input window
 132          */
 133         struct v4l2_rect subrect;
 134         /* Camera cropping rectangle */
 135         struct v4l2_rect rect;
 136         const struct soc_mbus_pixelfmt *extra_fmt;
 137         enum v4l2_mbus_pixelcode code;
 138 };
 139
 140 static struct sh_mobile_ceu_buffer *to_ceu_vb(struct vb2_buffer *vb)
 141 {
 142         return container_of(vb, struct sh_mobile_ceu_buffer, vb);
 143 }
 144
 145 static unsigned long make_bus_param(struct sh_mobile_ceu_dev *pcdev)
 146 {
 147         unsigned long flags;
 148
 149         flags = SOCAM_MASTER |
 150                 SOCAM_PCLK_SAMPLE_RISING |
 151                 SOCAM_HSYNC_ACTIVE_HIGH |
 152                 SOCAM_HSYNC_ACTIVE_LOW |
 153                 SOCAM_VSYNC_ACTIVE_HIGH |
 154                 SOCAM_VSYNC_ACTIVE_LOW |
 155                 SOCAM_DATA_ACTIVE_HIGH;
 156
 157         if (pcdev->pdata->flags & SH_CEU_FLAG_USE_8BIT_BUS)
 158                 flags |= SOCAM_DATAWIDTH_8;
 159
 160         if (pcdev->pdata->flags & SH_CEU_FLAG_USE_16BIT_BUS)
 161                 flags |= SOCAM_DATAWIDTH_16;
 162
 163         if (flags & SOCAM_DATAWIDTH_MASK)
 164                 return flags;
 165
 166         return 0;
 167 }
 168
 169 static void ceu_write(struct sh_mobile_ceu_dev *priv,
 170                       unsigned long reg_offs, u32 data)
 171 {
 172         iowrite32(data, priv->base + reg_offs);
 173 }
 174
 175 static u32 ceu_read(struct sh_mobile_ceu_dev *priv, unsigned long reg_offs)
 176 {
 177         return ioread32(priv->base + reg_offs);
 178 }
 179
 180 static int sh_mobile_ceu_soft_reset(struct sh_mobile_ceu_dev *pcdev)
 181 {
 182         int i, success = 0;
 183         struct soc_camera_device *icd = pcdev->icd;
 184
 185         ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
 186
 187         /* wait CSTSR.CPTON bit */
 188         for (i = 0; i < 1000; i++) {
 189                 if (!(ceu_read(pcdev, CSTSR) & 1)) {
 190                         success++;
 191                         break;
 192                 }
 193                 udelay(1);
 194         }
 195
 196         /* wait CAPSR.CPKIL bit */
 197         for (i = 0; i < 1000; i++) {
 198                 if (!(ceu_read(pcdev, CAPSR) & (1 << 16))) {
 199                         success++;
 200                         break;
 201                 }
 202                 udelay(1);
 203         }
 204
 205
 206         if (2 != success) {
 207                 dev_warn(&icd->dev, "soft reset time out\n");
 208                 return -EIO;
 209         }
 210
 211         return 0;
 212 }
 213
 214 /*
 215  *  Videobuf operations
 216  */
 217 static int sh_mobile_ceu_videobuf_setup(struct vb2_queue *vq,
 218                         unsigned int *count, unsigned int *num_planes,
 219                         unsigned long sizes[], void *alloc_ctxs[])
 220 {
 221         struct soc_camera_device *icd = container_of(vq, struct soc_camera_device, vb2_vidq);
 222         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 223         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 224         int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 225                                                 icd->current_fmt->host_fmt);
 226
 227         if (bytes_per_line < 0)
 228                 return bytes_per_line;
 229
 230         *num_planes = 1;
 231
 232         pcdev->sequence = 0;
 233         sizes[0] = bytes_per_line * icd->user_height;
 234         alloc_ctxs[0] = pcdev->alloc_ctx;
 235
 236         if (!*count)
 237                 *count = 2;
 238
 239         if (pcdev->video_limit) {
 240                 if (PAGE_ALIGN(sizes[0]) * *count > pcdev->video_limit)
 241                         *count = pcdev->video_limit / PAGE_ALIGN(sizes[0]);
 242         }
 243
 244         dev_dbg(icd->dev.parent, "count=%d, size=%lu\n", *count, sizes[0]);
 245
 246         return 0;
 247 }
 248
 249 #define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */
 250 #define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */
 251 #define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */
 252 #define CEU_CEIER_VBP   (1 << 20) /* vbp error */
 253 #define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */
 254 #define CEU_CEIER_MASK (CEU_CEIER_CPEIE | CEU_CEIER_VBP)
 255
 256
 257 /*
 258  * return value doesn't reflex the success/failure to queue the new buffer,
 259  * but rather the status of the previous buffer.
 260  */
 261 static int sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
 262 {
 263         struct soc_camera_device *icd = pcdev->icd;
 264         dma_addr_t phys_addr_top, phys_addr_bottom;
 265         unsigned long top1, top2;
 266         unsigned long bottom1, bottom2;
 267         u32 status;
 268         int ret = 0;
 269
 270         /*
 271          * The hardware is _very_ picky about this sequence. Especially
 272          * the CEU_CETCR_MAGIC value. It seems like we need to acknowledge
 273          * several not-so-well documented interrupt sources in CETCR.
 274          */
 275         ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_MASK);
 276         status = ceu_read(pcdev, CETCR);
 277         ceu_write(pcdev, CETCR, ~status & CEU_CETCR_MAGIC);
 278         if (!pcdev->frozen)
 279                 ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_MASK);
 280         ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP);
 281         ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW);
 282
 283         /*
 284          * When a VBP interrupt occurs, a capture end interrupt does not occur
 285          * and the image of that frame is not captured correctly. So, soft reset
 286          * is needed here.
 287          */
 288         if (status & CEU_CEIER_VBP) {
 289                 sh_mobile_ceu_soft_reset(pcdev);
 290                 ret = -EIO;
 291         }
 292
 293         if (pcdev->frozen) {
 294                 complete(&pcdev->complete);
 295                 return ret;
 296         }
 297
 298         if (!pcdev->active)
 299                 return ret;
 300
 301         if (V4L2_FIELD_INTERLACED_BT == pcdev->field) {
 302                 top1    = CDBYR;
 303                 top2    = CDBCR;
 304                 bottom1 = CDAYR;
 305                 bottom2 = CDACR;
 306         } else {
 307                 top1    = CDAYR;
 308                 top2    = CDACR;
 309                 bottom1 = CDBYR;
 310                 bottom2 = CDBCR;
 311         }
 312
 313         phys_addr_top = vb2_dma_contig_plane_paddr(pcdev->active, 0);
 314
 315         ceu_write(pcdev, top1, phys_addr_top);
 316         if (V4L2_FIELD_NONE != pcdev->field) {
 317                 phys_addr_bottom = phys_addr_top + icd->user_width;
 318                 ceu_write(pcdev, bottom1, phys_addr_bottom);
 319         }
 320
 321         switch (icd->current_fmt->host_fmt->fourcc) {
 322         case V4L2_PIX_FMT_NV12:
 323         case V4L2_PIX_FMT_NV21:
 324         case V4L2_PIX_FMT_NV16:
 325         case V4L2_PIX_FMT_NV61:
 326                 phys_addr_top += icd->user_width *
 327                         icd->user_height;
 328                 ceu_write(pcdev, top2, phys_addr_top);
 329                 if (V4L2_FIELD_NONE != pcdev->field) {
 330                         phys_addr_bottom = phys_addr_top + icd->user_width;
 331                         ceu_write(pcdev, bottom2, phys_addr_bottom);
 332                 }
 333         }
 334
 335         ceu_write(pcdev, CAPSR, 0x1); /* start capture */
 336
 337         return ret;
 338 }
 339
 340 static int sh_mobile_ceu_videobuf_prepare(struct vb2_buffer *vb)
 341 {
 342         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
 343         struct sh_mobile_ceu_buffer *buf;
 344         int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 345                                                 icd->current_fmt->host_fmt);
 346         unsigned long size;
 347
 348         if (bytes_per_line < 0)
 349                 return bytes_per_line;
 350
 351         buf = to_ceu_vb(vb);
 352
 353         dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
 354                 vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
 355
 356         /* Added list head initialization on alloc */
 357         WARN(!list_empty(&buf->queue), "Buffer %p on queue!\n", vb);
 358
 359 #ifdef DEBUG
 360         /*
 361          * This can be useful if you want to see if we actually fill
 362          * the buffer with something
 363          */
 364         if (vb2_plane_vaddr(vb, 0))
 365                 memset(vb2_plane_vaddr(vb, 0), 0xaa, vb2_get_plane_payload(vb, 0));
 366 #endif
 367
 368         BUG_ON(NULL == icd->current_fmt);
 369
 370         size = icd->user_height * bytes_per_line;
 371
 372         if (vb2_plane_size(vb, 0) < size) {
 373                 dev_err(icd->dev.parent, "Buffer too small (%lu < %lu)\n",
 374                         vb2_plane_size(vb, 0), size);
 375                 return -ENOBUFS;
 376         }
 377
 378         vb2_set_plane_payload(vb, 0, size);
 379
 380         return 0;
 381 }
 382
 383 static void sh_mobile_ceu_videobuf_queue(struct vb2_buffer *vb)
 384 {
 385         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
 386         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 387         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 388         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb);
 389
 390         dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
 391                 vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
 392
 393         spin_lock_irq(&pcdev->lock);
 394         list_add_tail(&buf->queue, &pcdev->capture);
 395
 396         if (!pcdev->active) {
 397                 /*
 398                  * Because there were no active buffer at this moment,
 399                  * we are not interested in the return value of
 400                  * sh_mobile_ceu_capture here.
 401                  */
 402                 pcdev->active = vb;
 403                 sh_mobile_ceu_capture(pcdev);
 404         }
 405         spin_unlock_irq(&pcdev->lock);
 406 }
 407
 408 static void sh_mobile_ceu_videobuf_release(struct vb2_buffer *vb)
 409 {
 410         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
 411         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 412         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb);
 413         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 414
 415         spin_lock_irq(&pcdev->lock);
 416
 417         if (pcdev->active == vb) {
 418                 /* disable capture (release DMA buffer), reset */
 419                 ceu_write(pcdev, CAPSR, 1 << 16);
 420                 pcdev->active = NULL;
 421         }
 422
 423         /* Doesn't hurt also if the list is empty */
 424         list_del_init(&buf->queue);
 425
 426         spin_unlock_irq(&pcdev->lock);
 427 }
 428
 429 static int sh_mobile_ceu_videobuf_init(struct vb2_buffer *vb)
 430 {
 431         /* This is for locking debugging only */
 432         INIT_LIST_HEAD(&to_ceu_vb(vb)->queue);
 433         return 0;
 434 }
 435
 436 static int sh_mobile_ceu_stop_streaming(struct vb2_queue *q)
 437 {
 438         struct soc_camera_device *icd = container_of(q, struct soc_camera_device, vb2_vidq);
 439         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 440         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 441         struct list_head *buf_head, *tmp;
 442
 443         spin_lock_irq(&pcdev->lock);
 444
 445         pcdev->active = NULL;
 446
 447         list_for_each_safe(buf_head, tmp, &pcdev->capture)
 448                 list_del_init(buf_head);
 449
 450         spin_unlock_irq(&pcdev->lock);
 451
 452         return sh_mobile_ceu_soft_reset(pcdev);
 453 }
 454
 455 static struct vb2_ops sh_mobile_ceu_videobuf_ops = {
 456         .queue_setup    = sh_mobile_ceu_videobuf_setup,
 457         .buf_prepare    = sh_mobile_ceu_videobuf_prepare,
 458         .buf_queue      = sh_mobile_ceu_videobuf_queue,
 459         .buf_cleanup    = sh_mobile_ceu_videobuf_release,
 460         .buf_init       = sh_mobile_ceu_videobuf_init,
 461         .wait_prepare   = soc_camera_unlock,
 462         .wait_finish    = soc_camera_lock,
 463         .stop_streaming = sh_mobile_ceu_stop_streaming,
 464 };
 465
 466 static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
 467 {
 468         struct sh_mobile_ceu_dev *pcdev = data;
 469         struct vb2_buffer *vb;
 470         int ret;
 471
 472         spin_lock(&pcdev->lock);
 473
 474         vb = pcdev->active;
 475         if (!vb)
 476                 /* Stale interrupt from a released buffer */
 477                 goto out;
 478
 479         list_del_init(&to_ceu_vb(vb)->queue);
 480
 481         if (!list_empty(&pcdev->capture))
 482                 pcdev->active = &list_entry(pcdev->capture.next,
 483                                             struct sh_mobile_ceu_buffer, queue)->vb;
 484         else
 485                 pcdev->active = NULL;
 486
 487         ret = sh_mobile_ceu_capture(pcdev);
 488         do_gettimeofday(&vb->v4l2_buf.timestamp);
 489         if (!ret) {
 490                 vb->v4l2_buf.field = pcdev->field;
 491                 vb->v4l2_buf.sequence = pcdev->sequence++;
 492         }
 493         vb2_buffer_done(vb, ret < 0 ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 494
 495 out:
 496         spin_unlock(&pcdev->lock);
 497
 498         return IRQ_HANDLED;
 499 }
 500
 501 /* Called with .video_lock held */
 502 static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
 503 {
 504         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 505         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 506         int ret;
 507
 508         if (pcdev->icd)
 509                 return -EBUSY;
 510
 511         dev_info(icd->dev.parent,
 512                  "SuperH Mobile CEU driver attached to camera %d\n",
 513                  icd->devnum);
 514
 515         pm_runtime_get_sync(ici->v4l2_dev.dev);
 516
 517         ret = sh_mobile_ceu_soft_reset(pcdev);
 518         if (!ret)
 519                 pcdev->icd = icd;
 520
 521         return ret;
 522 }
 523
 524 /* Called with .video_lock held */
 525 static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
 526 {
 527         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 528         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 529
 530         BUG_ON(icd != pcdev->icd);
 531
 532         /* disable capture, disable interrupts */
 533         ceu_write(pcdev, CEIER, 0);
 534         sh_mobile_ceu_soft_reset(pcdev);
 535
 536         /* make sure active buffer is canceled */
 537         spin_lock_irq(&pcdev->lock);
 538         if (pcdev->active) {
 539                 list_del_init(&to_ceu_vb(pcdev->active)->queue);
 540                 vb2_buffer_done(pcdev->active, VB2_BUF_STATE_ERROR);
 541                 pcdev->active = NULL;
 542         }
 543         spin_unlock_irq(&pcdev->lock);
 544
 545         pm_runtime_put_sync(ici->v4l2_dev.dev);
 546
 547         dev_info(icd->dev.parent,
 548                  "SuperH Mobile CEU driver detached from camera %d\n",
 549                  icd->devnum);
 550
 551         pcdev->icd = NULL;
 552 }
 553
 554 /*
 555  * See chapter 29.4.12 "Capture Filter Control Register (CFLCR)"
 556  * in SH7722 Hardware Manual
 557  */
 558 static unsigned int size_dst(unsigned int src, unsigned int scale)
 559 {
 560         unsigned int mant_pre = scale >> 12;
 561         if (!src || !scale)
 562                 return src;
 563         return ((mant_pre + 2 * (src - 1)) / (2 * mant_pre) - 1) *
 564                 mant_pre * 4096 / scale + 1;
 565 }
 566
 567 static u16 calc_scale(unsigned int src, unsigned int *dst)
 568 {
 569         u16 scale;
 570
 571         if (src == *dst)
 572                 return 0;
 573
 574         scale = (src * 4096 / *dst) & ~7;
 575
 576         while (scale > 4096 && size_dst(src, scale) < *dst)
 577                 scale -= 8;
 578
 579         *dst = size_dst(src, scale);
 580
 581         return scale;
 582 }
 583
 584 /* rect is guaranteed to not exceed the scaled camera rectangle */
 585 static void sh_mobile_ceu_set_rect(struct soc_camera_device *icd)
 586 {
 587         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 588         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 589         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 590         unsigned int height, width, cdwdr_width, in_width, in_height;
 591         unsigned int left_offset, top_offset;
 592         u32 camor;
 593
 594         dev_geo(icd->dev.parent, "Crop %ux%u@%u:%u\n",
 595                 icd->user_width, icd->user_height, cam->ceu_left, cam->ceu_top);
 596
 597         left_offset     = cam->ceu_left;
 598         top_offset      = cam->ceu_top;
 599
 600         /* CEU cropping (CFSZR) is applied _after_ the scaling filter (CFLCR) */
 601         if (pcdev->image_mode) {
 602                 in_width = cam->width;
 603                 if (!pcdev->is_16bit) {
 604                         in_width *= 2;
 605                         left_offset *= 2;
 606                 }
 607                 width = icd->user_width;
 608                 cdwdr_width = icd->user_width;
 609         } else {
 610                 int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 611                                                 icd->current_fmt->host_fmt);
 612                 unsigned int w_factor;
 613
 614                 width = icd->user_width;
 615
 616                 switch (icd->current_fmt->host_fmt->packing) {
 617                 case SOC_MBUS_PACKING_2X8_PADHI:
 618                         w_factor = 2;
 619                         break;
 620                 default:
 621                         w_factor = 1;
 622                 }
 623
 624                 in_width = cam->width * w_factor;
 625                 left_offset = left_offset * w_factor;
 626
 627                 if (bytes_per_line < 0)
 628                         cdwdr_width = icd->user_width;
 629                 else
 630                         cdwdr_width = bytes_per_line;
 631         }
 632
 633         height = icd->user_height;
 634         in_height = cam->height;
 635         if (V4L2_FIELD_NONE != pcdev->field) {
 636                 height /= 2;
 637                 in_height /= 2;
 638                 top_offset /= 2;
 639                 cdwdr_width *= 2;
 640         }
 641
 642         /* CSI2 special configuration */
 643         if (pcdev->pdata->csi2_dev) {
 644                 in_width = ((in_width - 2) * 2);
 645                 left_offset *= 2;
 646         }
 647
 648         /* Set CAMOR, CAPWR, CFSZR, take care of CDWDR */
 649         camor = left_offset | (top_offset << 16);
 650
 651         dev_geo(icd->dev.parent,
 652                 "CAMOR 0x%x, CAPWR 0x%x, CFSZR 0x%x, CDWDR 0x%x\n", camor,
 653                 (in_height << 16) | in_width, (height << 16) | width,
 654                 cdwdr_width);
 655
 656         ceu_write(pcdev, CAMOR, camor);
 657         ceu_write(pcdev, CAPWR, (in_height << 16) | in_width);
 658         ceu_write(pcdev, CFSZR, (height << 16) | width);
 659         ceu_write(pcdev, CDWDR, cdwdr_width);
 660 }
 661
 662 static u32 capture_save_reset(struct sh_mobile_ceu_dev *pcdev)
 663 {
 664         u32 capsr = ceu_read(pcdev, CAPSR);
 665         ceu_write(pcdev, CAPSR, 1 << 16); /* reset, stop capture */
 666         return capsr;
 667 }
 668
 669 static void capture_restore(struct sh_mobile_ceu_dev *pcdev, u32 capsr)
 670 {
 671         unsigned long timeout = jiffies + 10 * HZ;
 672
 673         /*
 674          * Wait until the end of the current frame. It can take a long time,
 675          * but if it has been aborted by a CAPSR reset, it shoule exit sooner.
 676          */
 677         while ((ceu_read(pcdev, CSTSR) & 1) && time_before(jiffies, timeout))
 678                 msleep(1);
 679
 680         if (time_after(jiffies, timeout)) {
 681                 dev_err(pcdev->ici.v4l2_dev.dev,
 682                         "Timeout waiting for frame end! Interface problem?\n");
 683                 return;
 684         }
 685
 686         /* Wait until reset clears, this shall not hang... */
 687         while (ceu_read(pcdev, CAPSR) & (1 << 16))
 688                 udelay(10);
 689
 690         /* Anything to restore? */
 691         if (capsr & ~(1 << 16))
 692                 ceu_write(pcdev, CAPSR, capsr);
 693 }
 694
 695 /* Capture is not running, no interrupts, no locking needed */
 696 static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
 697                                        __u32 pixfmt)
 698 {
 699         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 700         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 701         int ret;
 702         unsigned long camera_flags, common_flags, value;
 703         int yuv_lineskip;
 704         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 705         u32 capsr = capture_save_reset(pcdev);
 706
 707         camera_flags = icd->ops->query_bus_param(icd);
 708         common_flags = soc_camera_bus_param_compatible(camera_flags,
 709                                                        make_bus_param(pcdev));
 710         if (!common_flags)
 711                 return -EINVAL;
 712
 713         /* Make choises, based on platform preferences */
 714         if ((common_flags & SOCAM_HSYNC_ACTIVE_HIGH) &&
 715             (common_flags & SOCAM_HSYNC_ACTIVE_LOW)) {
 716                 if (pcdev->pdata->flags & SH_CEU_FLAG_HSYNC_LOW)
 717                         common_flags &= ~SOCAM_HSYNC_ACTIVE_HIGH;
 718                 else
 719                         common_flags &= ~SOCAM_HSYNC_ACTIVE_LOW;
 720         }
 721
 722         if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) &&
 723             (common_flags & SOCAM_VSYNC_ACTIVE_LOW)) {
 724                 if (pcdev->pdata->flags & SH_CEU_FLAG_VSYNC_LOW)
 725                         common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH;
 726                 else
 727                         common_flags &= ~SOCAM_VSYNC_ACTIVE_LOW;
 728         }
 729
 730         ret = icd->ops->set_bus_param(icd, common_flags);
 731         if (ret < 0)
 732                 return ret;
 733
 734         switch (common_flags & SOCAM_DATAWIDTH_MASK) {
 735         case SOCAM_DATAWIDTH_8:
 736                 pcdev->is_16bit = 0;
 737                 break;
 738         case SOCAM_DATAWIDTH_16:
 739                 pcdev->is_16bit = 1;
 740                 break;
 741         default:
 742                 return -EINVAL;
 743         }
 744
 745         ceu_write(pcdev, CRCNTR, 0);
 746         ceu_write(pcdev, CRCMPR, 0);
 747
 748         value = 0x00000010; /* data fetch by default */
 749         yuv_lineskip = 0;
 750
 751         switch (icd->current_fmt->host_fmt->fourcc) {
 752         case V4L2_PIX_FMT_NV12:
 753         case V4L2_PIX_FMT_NV21:
 754                 yuv_lineskip = 1; /* skip for NV12/21, no skip for NV16/61 */
 755                 /* fall-through */
 756         case V4L2_PIX_FMT_NV16:
 757         case V4L2_PIX_FMT_NV61:
 758                 switch (cam->code) {
 759                 case V4L2_MBUS_FMT_UYVY8_2X8:
 760                         value = 0x00000000; /* Cb0, Y0, Cr0, Y1 */
 761                         break;
 762                 case V4L2_MBUS_FMT_VYUY8_2X8:
 763                         value = 0x00000100; /* Cr0, Y0, Cb0, Y1 */
 764                         break;
 765                 case V4L2_MBUS_FMT_YUYV8_2X8:
 766                         value = 0x00000200; /* Y0, Cb0, Y1, Cr0 */
 767                         break;
 768                 case V4L2_MBUS_FMT_YVYU8_2X8:
 769                         value = 0x00000300; /* Y0, Cr0, Y1, Cb0 */
 770                         break;
 771                 default:
 772                         BUG();
 773                 }
 774         }
 775
 776         if (icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV21 ||
 777             icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV61)
 778                 value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */
 779
 780         value |= common_flags & SOCAM_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
 781         value |= common_flags & SOCAM_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
 782         value |= pcdev->is_16bit ? 1 << 12 : 0;
 783
 784         /* CSI2 mode */
 785         if (pcdev->pdata->csi2_dev)
 786                 value |= 3 << 12;
 787
 788         ceu_write(pcdev, CAMCR, value);
 789
 790         ceu_write(pcdev, CAPCR, 0x00300000);
 791
 792         switch (pcdev->field) {
 793         case V4L2_FIELD_INTERLACED_TB:
 794                 value = 0x101;
 795                 break;
 796         case V4L2_FIELD_INTERLACED_BT:
 797                 value = 0x102;
 798                 break;
 799         default:
 800                 value = 0;
 801                 break;
 802         }
 803         ceu_write(pcdev, CAIFR, value);
 804
 805         sh_mobile_ceu_set_rect(icd);
 806         mdelay(1);
 807
 808         dev_geo(icd->dev.parent, "CFLCR 0x%x\n", pcdev->cflcr);
 809         ceu_write(pcdev, CFLCR, pcdev->cflcr);
 810
 811         /*
 812          * A few words about byte order (observed in Big Endian mode)
 813          *
 814          * In data fetch mode bytes are received in chunks of 8 bytes.
 815          * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
 816          *
 817          * The data is however by default written to memory in reverse order:
 818          * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
 819          *
 820          * The lowest three bits of CDOCR allows us to do swapping,
 821          * using 7 we swap the data bytes to match the incoming order:
 822          * D0, D1, D2, D3, D4, D5, D6, D7
 823          */
 824         value = 0x00000017;
 825         if (yuv_lineskip)
 826                 value &= ~0x00000010; /* convert 4:2:2 -> 4:2:0 */
 827
 828         ceu_write(pcdev, CDOCR, value);
 829         ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
 830
 831         dev_dbg(icd->dev.parent, "S_FMT successful for %c%c%c%c %ux%u\n",
 832                 pixfmt & 0xff, (pixfmt >> 8) & 0xff,
 833                 (pixfmt >> 16) & 0xff, (pixfmt >> 24) & 0xff,
 834                 icd->user_width, icd->user_height);
 835
 836         capture_restore(pcdev, capsr);
 837
 838         /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
 839         return 0;
 840 }
 841
 842 static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd,
 843                                        unsigned char buswidth)
 844 {
 845         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 846         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 847         unsigned long camera_flags, common_flags;
 848
 849         camera_flags = icd->ops->query_bus_param(icd);
 850         common_flags = soc_camera_bus_param_compatible(camera_flags,
 851                                                        make_bus_param(pcdev));
 852         if (!common_flags || buswidth > 16 ||
 853             (buswidth > 8 && !(common_flags & SOCAM_DATAWIDTH_16)))
 854                 return -EINVAL;
 855
 856         return 0;
 857 }
 858
 859 static const struct soc_mbus_pixelfmt sh_mobile_ceu_formats[] = {
 860         {
 861                 .fourcc                 = V4L2_PIX_FMT_NV12,
 862                 .name                   = "NV12",
 863                 .bits_per_sample        = 12,
 864                 .packing                = SOC_MBUS_PACKING_NONE,
 865                 .order                  = SOC_MBUS_ORDER_LE,
 866         }, {
 867                 .fourcc                 = V4L2_PIX_FMT_NV21,
 868                 .name                   = "NV21",
 869                 .bits_per_sample        = 12,
 870                 .packing                = SOC_MBUS_PACKING_NONE,
 871                 .order                  = SOC_MBUS_ORDER_LE,
 872         }, {
 873                 .fourcc                 = V4L2_PIX_FMT_NV16,
 874                 .name                   = "NV16",
 875                 .bits_per_sample        = 16,
 876                 .packing                = SOC_MBUS_PACKING_NONE,
 877                 .order                  = SOC_MBUS_ORDER_LE,
 878         }, {
 879                 .fourcc                 = V4L2_PIX_FMT_NV61,
 880                 .name                   = "NV61",
 881                 .bits_per_sample        = 16,
 882                 .packing                = SOC_MBUS_PACKING_NONE,
 883                 .order                  = SOC_MBUS_ORDER_LE,
 884         },
 885 };
 886
 887 /* This will be corrected as we get more formats */
 888 static bool sh_mobile_ceu_packing_supported(const struct soc_mbus_pixelfmt *fmt)
 889 {
 890         return  fmt->packing == SOC_MBUS_PACKING_NONE ||
 891                 (fmt->bits_per_sample == 8 &&
 892                  fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
 893                 (fmt->bits_per_sample > 8 &&
 894                  fmt->packing == SOC_MBUS_PACKING_EXTEND16);
 895 }
 896
 897 static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect);
 898
 899 static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, unsigned int idx,
 900                                      struct soc_camera_format_xlate *xlate)
 901 {
 902         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 903         struct device *dev = icd->dev.parent;
 904         struct soc_camera_host *ici = to_soc_camera_host(dev);
 905         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 906         int ret, k, n;
 907         int formats = 0;
 908         struct sh_mobile_ceu_cam *cam;
 909         enum v4l2_mbus_pixelcode code;
 910         const struct soc_mbus_pixelfmt *fmt;
 911
 912         ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
 913         if (ret < 0)
 914                 /* No more formats */
 915                 return 0;
 916
 917         fmt = soc_mbus_get_fmtdesc(code);
 918         if (!fmt) {
 919                 dev_warn(dev, "unsupported format code #%u: %d\n", idx, code);
 920                 return 0;
 921         }
 922
 923         if (!pcdev->pdata->csi2_dev) {
 924                 ret = sh_mobile_ceu_try_bus_param(icd, fmt->bits_per_sample);
 925                 if (ret < 0)
 926                         return 0;
 927         }
 928
 929         if (!icd->host_priv) {
 930                 struct v4l2_mbus_framefmt mf;
 931                 struct v4l2_rect rect;
 932                 int shift = 0;
 933
 934                 /* FIXME: subwindow is lost between close / open */
 935
 936                 /* Cache current client geometry */
 937                 ret = client_g_rect(sd, &rect);
 938                 if (ret < 0)
 939                         return ret;
 940
 941                 /* First time */
 942                 ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
 943                 if (ret < 0)
 944                         return ret;
 945
 946                 while ((mf.width > 2560 || mf.height > 1920) && shift < 4) {
 947                         /* Try 2560x1920, 1280x960, 640x480, 320x240 */
 948                         mf.width        = 2560 >> shift;
 949                         mf.height       = 1920 >> shift;
 950                         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
 951                                                          s_mbus_fmt, &mf);
 952                         if (ret < 0)
 953                                 return ret;
 954                         shift++;
 955                 }
 956
 957                 if (shift == 4) {
 958                         dev_err(dev, "Failed to configure the client below %ux%x\n",
 959                                 mf.width, mf.height);
 960                         return -EIO;
 961                 }
 962
 963                 dev_geo(dev, "camera fmt %ux%u\n", mf.width, mf.height);
 964
 965                 cam = kzalloc(sizeof(*cam), GFP_KERNEL);
 966                 if (!cam)
 967                         return -ENOMEM;
 968
 969                 /* We are called with current camera crop, initialise subrect with it */
 970                 cam->rect       = rect;
 971                 cam->subrect    = rect;
 972
 973                 cam->width      = mf.width;
 974                 cam->height     = mf.height;
 975
 976                 cam->width      = mf.width;
 977                 cam->height     = mf.height;
 978
 979                 icd->host_priv = cam;
 980         } else {
 981                 cam = icd->host_priv;
 982         }
 983
 984         /* Beginning of a pass */
 985         if (!idx)
 986                 cam->extra_fmt = NULL;
 987
 988         switch (code) {
 989         case V4L2_MBUS_FMT_UYVY8_2X8:
 990         case V4L2_MBUS_FMT_VYUY8_2X8:
 991         case V4L2_MBUS_FMT_YUYV8_2X8:
 992         case V4L2_MBUS_FMT_YVYU8_2X8:
 993                 if (cam->extra_fmt)
 994                         break;
 995
 996                 /*
 997                  * Our case is simple so far: for any of the above four camera
 998                  * formats we add all our four synthesized NV* formats, so,
 999                  * just marking the device with a single flag suffices. If
1000                  * the format generation rules are more complex, you would have
1001                  * to actually hang your already added / counted formats onto
1002                  * the host_priv pointer and check whether the format you're
1003                  * going to add now is already there.
1004                  */
1005                 cam->extra_fmt = sh_mobile_ceu_formats;
1006
1007                 n = ARRAY_SIZE(sh_mobile_ceu_formats);
1008                 formats += n;
1009                 for (k = 0; xlate && k < n; k++) {
1010                         xlate->host_fmt = &sh_mobile_ceu_formats[k];
1011                         xlate->code     = code;
1012                         xlate++;
1013                         dev_dbg(dev, "Providing format %s using code %d\n",
1014                                 sh_mobile_ceu_formats[k].name, code);
1015                 }
1016                 break;
1017         default:
1018                 if (!sh_mobile_ceu_packing_supported(fmt))
1019                         return 0;
1020         }
1021
1022         /* Generic pass-through */
1023         formats++;
1024         if (xlate) {
1025                 xlate->host_fmt = fmt;
1026                 xlate->code     = code;
1027                 xlate++;
1028                 dev_dbg(dev, "Providing format %s in pass-through mode\n",
1029                         fmt->name);
1030         }
1031
1032         return formats;
1033 }
1034
1035 static void sh_mobile_ceu_put_formats(struct soc_camera_device *icd)
1036 {
1037         kfree(icd->host_priv);
1038         icd->host_priv = NULL;
1039 }
1040
1041 /* Check if any dimension of r1 is smaller than respective one of r2 */
1042 static bool is_smaller(struct v4l2_rect *r1, struct v4l2_rect *r2)
1043 {
1044         return r1->width < r2->width || r1->height < r2->height;
1045 }
1046
1047 /* Check if r1 fails to cover r2 */
1048 static bool is_inside(struct v4l2_rect *r1, struct v4l2_rect *r2)
1049 {
1050         return r1->left > r2->left || r1->top > r2->top ||
1051                 r1->left + r1->width < r2->left + r2->width ||
1052                 r1->top + r1->height < r2->top + r2->height;
1053 }
1054
1055 static unsigned int scale_down(unsigned int size, unsigned int scale)
1056 {
1057         return (size * 4096 + scale / 2) / scale;
1058 }
1059
1060 static unsigned int calc_generic_scale(unsigned int input, unsigned int output)
1061 {
1062         return (input * 4096 + output / 2) / output;
1063 }
1064
1065 /* Get and store current client crop */
1066 static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect)
1067 {
1068         struct v4l2_crop crop;
1069         struct v4l2_cropcap cap;
1070         int ret;
1071
1072         crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1073
1074         ret = v4l2_subdev_call(sd, video, g_crop, &crop);
1075         if (!ret) {
1076                 *rect = crop.c;
1077                 return ret;
1078         }
1079
1080         /* Camera driver doesn't support .g_crop(), assume default rectangle */
1081         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1082
1083         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1084         if (!ret)
1085                 *rect = cap.defrect;
1086
1087         return ret;
1088 }
1089
1090 /* Client crop has changed, update our sub-rectangle to remain within the area */
1091 static void update_subrect(struct sh_mobile_ceu_cam *cam)
1092 {
1093         struct v4l2_rect *rect = &cam->rect, *subrect = &cam->subrect;
1094
1095         if (rect->width < subrect->width)
1096                 subrect->width = rect->width;
1097
1098         if (rect->height < subrect->height)
1099                 subrect->height = rect->height;
1100
1101         if (rect->left > subrect->left)
1102                 subrect->left = rect->left;
1103         else if (rect->left + rect->width >
1104                  subrect->left + subrect->width)
1105                 subrect->left = rect->left + rect->width -
1106                         subrect->width;
1107
1108         if (rect->top > subrect->top)
1109                 subrect->top = rect->top;
1110         else if (rect->top + rect->height >
1111                  subrect->top + subrect->height)
1112                 subrect->top = rect->top + rect->height -
1113                         subrect->height;
1114 }
1115
1116 /*
1117  * The common for both scaling and cropping iterative approach is:
1118  * 1. try if the client can produce exactly what requested by the user
1119  * 2. if (1) failed, try to double the client image until we get one big enough
1120  * 3. if (2) failed, try to request the maximum image
1121  */
1122 static int client_s_crop(struct soc_camera_device *icd, struct v4l2_crop *crop,
1123                          struct v4l2_crop *cam_crop)
1124 {
1125         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1126         struct v4l2_rect *rect = &crop->c, *cam_rect = &cam_crop->c;
1127         struct device *dev = sd->v4l2_dev->dev;
1128         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1129         struct v4l2_cropcap cap;
1130         int ret;
1131         unsigned int width, height;
1132
1133         v4l2_subdev_call(sd, video, s_crop, crop);
1134         ret = client_g_rect(sd, cam_rect);
1135         if (ret < 0)
1136                 return ret;
1137
1138         /*
1139          * Now cam_crop contains the current camera input rectangle, and it must
1140          * be within camera cropcap bounds
1141          */
1142         if (!memcmp(rect, cam_rect, sizeof(*rect))) {
1143                 /* Even if camera S_CROP failed, but camera rectangle matches */
1144                 dev_dbg(dev, "Camera S_CROP successful for %dx%d@%d:%d\n",
1145                         rect->width, rect->height, rect->left, rect->top);
1146                 cam->rect = *cam_rect;
1147                 return 0;
1148         }
1149
1150         /* Try to fix cropping, that camera hasn't managed to set */
1151         dev_geo(dev, "Fix camera S_CROP for %dx%d@%d:%d to %dx%d@%d:%d\n",
1152                 cam_rect->width, cam_rect->height,
1153                 cam_rect->left, cam_rect->top,
1154                 rect->width, rect->height, rect->left, rect->top);
1155
1156         /* We need sensor maximum rectangle */
1157         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1158         if (ret < 0)
1159                 return ret;
1160
1161         /* Put user requested rectangle within sensor bounds */
1162         soc_camera_limit_side(&rect->left, &rect->width, cap.bounds.left, 2,
1163                               cap.bounds.width);
1164         soc_camera_limit_side(&rect->top, &rect->height, cap.bounds.top, 4,
1165                               cap.bounds.height);
1166
1167         /*
1168          * Popular special case - some cameras can only handle fixed sizes like
1169          * QVGA, VGA,... Take care to avoid infinite loop.
1170          */
1171         width = max(cam_rect->width, 2);
1172         height = max(cam_rect->height, 2);
1173
1174         /*
1175          * Loop as long as sensor is not covering the requested rectangle and
1176          * is still within its bounds
1177          */
1178         while (!ret && (is_smaller(cam_rect, rect) ||
1179                         is_inside(cam_rect, rect)) &&
1180                (cap.bounds.width > width || cap.bounds.height > height)) {
1181
1182                 width *= 2;
1183                 height *= 2;
1184
1185                 cam_rect->width = width;
1186                 cam_rect->height = height;
1187
1188                 /*
1189                  * We do not know what capabilities the camera has to set up
1190                  * left and top borders. We could try to be smarter in iterating
1191                  * them, e.g., if camera current left is to the right of the
1192                  * target left, set it to the middle point between the current
1193                  * left and minimum left. But that would add too much
1194                  * complexity: we would have to iterate each border separately.
1195                  * Instead we just drop to the left and top bounds.
1196                  */
1197                 if (cam_rect->left > rect->left)
1198                         cam_rect->left = cap.bounds.left;
1199
1200                 if (cam_rect->left + cam_rect->width < rect->left + rect->width)
1201                         cam_rect->width = rect->left + rect->width -
1202                                 cam_rect->left;
1203
1204                 if (cam_rect->top > rect->top)
1205                         cam_rect->top = cap.bounds.top;
1206
1207                 if (cam_rect->top + cam_rect->height < rect->top + rect->height)
1208                         cam_rect->height = rect->top + rect->height -
1209                                 cam_rect->top;
1210
1211                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1212                 ret = client_g_rect(sd, cam_rect);
1213                 dev_geo(dev, "Camera S_CROP %d for %dx%d@%d:%d\n", ret,
1214                         cam_rect->width, cam_rect->height,
1215                         cam_rect->left, cam_rect->top);
1216         }
1217
1218         /* S_CROP must not modify the rectangle */
1219         if (is_smaller(cam_rect, rect) || is_inside(cam_rect, rect)) {
1220                 /*
1221                  * The camera failed to configure a suitable cropping,
1222                  * we cannot use the current rectangle, set to max
1223                  */
1224                 *cam_rect = cap.bounds;
1225                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1226                 ret = client_g_rect(sd, cam_rect);
1227                 dev_geo(dev, "Camera S_CROP %d for max %dx%d@%d:%d\n", ret,
1228                         cam_rect->width, cam_rect->height,
1229                         cam_rect->left, cam_rect->top);
1230         }
1231
1232         if (!ret) {
1233                 cam->rect = *cam_rect;
1234                 update_subrect(cam);
1235         }
1236
1237         return ret;
1238 }
1239
1240 /* Iterative s_mbus_fmt, also updates cached client crop on success */
1241 static int client_s_fmt(struct soc_camera_device *icd,
1242                         struct v4l2_mbus_framefmt *mf, bool ceu_can_scale)
1243 {
1244         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1245         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1246         struct device *dev = icd->dev.parent;
1247         unsigned int width = mf->width, height = mf->height, tmp_w, tmp_h;
1248         unsigned int max_width, max_height;
1249         struct v4l2_cropcap cap;
1250         int ret;
1251
1252         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
1253                                          s_mbus_fmt, mf);
1254         if (ret < 0)
1255                 return ret;
1256
1257         dev_geo(dev, "camera scaled to %ux%u\n", mf->width, mf->height);
1258
1259         if ((width == mf->width && height == mf->height) || !ceu_can_scale)
1260                 goto update_cache;
1261
1262         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1263
1264         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1265         if (ret < 0)
1266                 return ret;
1267
1268         max_width = min(cap.bounds.width, 2560);
1269         max_height = min(cap.bounds.height, 1920);
1270
1271         /* Camera set a format, but geometry is not precise, try to improve */
1272         tmp_w = mf->width;
1273         tmp_h = mf->height;
1274
1275         /* width <= max_width && height <= max_height - guaranteed by try_fmt */
1276         while ((width > tmp_w || height > tmp_h) &&
1277                tmp_w < max_width && tmp_h < max_height) {
1278                 tmp_w = min(2 * tmp_w, max_width);
1279                 tmp_h = min(2 * tmp_h, max_height);
1280                 mf->width = tmp_w;
1281                 mf->height = tmp_h;
1282                 ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
1283                                                  s_mbus_fmt, mf);
1284                 dev_geo(dev, "Camera scaled to %ux%u\n",
1285                         mf->width, mf->height);
1286                 if (ret < 0) {
1287                         /* This shouldn't happen */
1288                         dev_err(dev, "Client failed to set format: %d\n", ret);
1289                         return ret;
1290                 }
1291         }
1292
1293 update_cache:
1294         /* Update cache */
1295         ret = client_g_rect(sd, &cam->rect);
1296         if (ret < 0)
1297                 return ret;
1298
1299         update_subrect(cam);
1300
1301         return 0;
1302 }
1303
1304 /**
1305  * @width       - on output: user width, mapped back to input
1306  * @height      - on output: user height, mapped back to input
1307  * @mf          - in- / output camera output window
1308  */
1309 static int client_scale(struct soc_camera_device *icd,
1310                         struct v4l2_mbus_framefmt *mf,
1311                         unsigned int *width, unsigned int *height,
1312                         bool ceu_can_scale)
1313 {
1314         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1315         struct device *dev = icd->dev.parent;
1316         struct v4l2_mbus_framefmt mf_tmp = *mf;
1317         unsigned int scale_h, scale_v;
1318         int ret;
1319
1320         /*
1321          * 5. Apply iterative camera S_FMT for camera user window (also updates
1322          *    client crop cache and the imaginary sub-rectangle).
1323          */
1324         ret = client_s_fmt(icd, &mf_tmp, ceu_can_scale);
1325         if (ret < 0)
1326                 return ret;
1327
1328         dev_geo(dev, "5: camera scaled to %ux%u\n",
1329                 mf_tmp.width, mf_tmp.height);
1330
1331         /* 6. Retrieve camera output window (g_fmt) */
1332
1333         /* unneeded - it is already in "mf_tmp" */
1334
1335         /* 7. Calculate new client scales. */
1336         scale_h = calc_generic_scale(cam->rect.width, mf_tmp.width);
1337         scale_v = calc_generic_scale(cam->rect.height, mf_tmp.height);
1338
1339         mf->width       = mf_tmp.width;
1340         mf->height      = mf_tmp.height;
1341         mf->colorspace  = mf_tmp.colorspace;
1342
1343         /*
1344          * 8. Calculate new CEU crop - apply camera scales to previously
1345          *    updated "effective" crop.
1346          */
1347         *width = scale_down(cam->subrect.width, scale_h);
1348         *height = scale_down(cam->subrect.height, scale_v);
1349
1350         dev_geo(dev, "8: new client sub-window %ux%u\n", *width, *height);
1351
1352         return 0;
1353 }
1354
1355 /*
1356  * CEU can scale and crop, but we don't want to waste bandwidth and kill the
1357  * framerate by always requesting the maximum image from the client. See
1358  * Documentation/video4linux/sh_mobile_ceu_camera.txt for a description of
1359  * scaling and cropping algorithms and for the meaning of referenced here steps.
1360  */
1361 static int sh_mobile_ceu_set_crop(struct soc_camera_device *icd,
1362                                   struct v4l2_crop *a)
1363 {
1364         struct v4l2_rect *rect = &a->c;
1365         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1366         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1367         struct v4l2_crop cam_crop;
1368         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1369         struct v4l2_rect *cam_rect = &cam_crop.c;
1370         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1371         struct device *dev = icd->dev.parent;
1372         struct v4l2_mbus_framefmt mf;
1373         unsigned int scale_cam_h, scale_cam_v, scale_ceu_h, scale_ceu_v,
1374                 out_width, out_height;
1375         int interm_width, interm_height;
1376         u32 capsr, cflcr;
1377         int ret;
1378
1379         dev_geo(dev, "S_CROP(%ux%u@%u:%u)\n", rect->width, rect->height,
1380                 rect->left, rect->top);
1381
1382         /* During camera cropping its output window can change too, stop CEU */
1383         capsr = capture_save_reset(pcdev);
1384         dev_dbg(dev, "CAPSR 0x%x, CFLCR 0x%x\n", capsr, pcdev->cflcr);
1385
1386         /* 1. - 2. Apply iterative camera S_CROP for new input window. */
1387         ret = client_s_crop(icd, a, &cam_crop);
1388         if (ret < 0)
1389                 return ret;
1390
1391         dev_geo(dev, "1-2: camera cropped to %ux%u@%u:%u\n",
1392                 cam_rect->width, cam_rect->height,
1393                 cam_rect->left, cam_rect->top);
1394
1395         /* On success cam_crop contains current camera crop */
1396
1397         /* 3. Retrieve camera output window */
1398         ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
1399         if (ret < 0)
1400                 return ret;
1401
1402         if (mf.width > 2560 || mf.height > 1920)
1403                 return -EINVAL;
1404
1405         /* 4. Calculate camera scales */
1406         scale_cam_h     = calc_generic_scale(cam_rect->width, mf.width);
1407         scale_cam_v     = calc_generic_scale(cam_rect->height, mf.height);
1408
1409         /* Calculate intermediate window */
1410         interm_width    = scale_down(rect->width, scale_cam_h);
1411         interm_height   = scale_down(rect->height, scale_cam_v);
1412
1413         if (interm_width < icd->user_width) {
1414                 u32 new_scale_h;
1415
1416                 new_scale_h = calc_generic_scale(rect->width, icd->user_width);
1417
1418                 mf.width = scale_down(cam_rect->width, new_scale_h);
1419         }
1420
1421         if (interm_height < icd->user_height) {
1422                 u32 new_scale_v;
1423
1424                 new_scale_v = calc_generic_scale(rect->height, icd->user_height);
1425
1426                 mf.height = scale_down(cam_rect->height, new_scale_v);
1427         }
1428
1429         if (interm_width < icd->user_width || interm_height < icd->user_height) {
1430                 ret = v4l2_device_call_until_err(sd->v4l2_dev, (int)icd, video,
1431                                                  s_mbus_fmt, &mf);
1432                 if (ret < 0)
1433                         return ret;
1434
1435                 dev_geo(dev, "New camera output %ux%u\n", mf.width, mf.height);
1436                 scale_cam_h     = calc_generic_scale(cam_rect->width, mf.width);
1437                 scale_cam_v     = calc_generic_scale(cam_rect->height, mf.height);
1438                 interm_width    = scale_down(rect->width, scale_cam_h);
1439                 interm_height   = scale_down(rect->height, scale_cam_v);
1440         }
1441
1442         /* Cache camera output window */
1443         cam->width      = mf.width;
1444         cam->height     = mf.height;
1445
1446         if (pcdev->image_mode) {
1447                 out_width       = min(interm_width, icd->user_width);
1448                 out_height      = min(interm_height, icd->user_height);
1449         } else {
1450                 out_width       = interm_width;
1451                 out_height      = interm_height;
1452         }
1453
1454         /*
1455          * 5. Calculate CEU scales from camera scales from results of (5) and
1456          *    the user window
1457          */
1458         scale_ceu_h     = calc_scale(interm_width, &out_width);
1459         scale_ceu_v     = calc_scale(interm_height, &out_height);
1460
1461         dev_geo(dev, "5: CEU scales %u:%u\n", scale_ceu_h, scale_ceu_v);
1462
1463         /* Apply CEU scales. */
1464         cflcr = scale_ceu_h | (scale_ceu_v << 16);
1465         if (cflcr != pcdev->cflcr) {
1466                 pcdev->cflcr = cflcr;
1467                 ceu_write(pcdev, CFLCR, cflcr);
1468         }
1469
1470         icd->user_width  = out_width;
1471         icd->user_height = out_height;
1472         cam->ceu_left    = scale_down(rect->left - cam_rect->left, scale_cam_h) & ~1;
1473         cam->ceu_top     = scale_down(rect->top - cam_rect->top, scale_cam_v) & ~1;
1474
1475         /* 6. Use CEU cropping to crop to the new window. */
1476         sh_mobile_ceu_set_rect(icd);
1477
1478         cam->subrect = *rect;
1479
1480         dev_geo(dev, "6: CEU cropped to %ux%u@%u:%u\n",
1481                 icd->user_width, icd->user_height,
1482                 cam->ceu_left, cam->ceu_top);
1483
1484         /* Restore capture. The CE bit can be cleared by the hardware */
1485         if (pcdev->active)
1486                 capsr |= 1;
1487         capture_restore(pcdev, capsr);
1488
1489         /* Even if only camera cropping succeeded */
1490         return ret;
1491 }
1492
1493 static int sh_mobile_ceu_get_crop(struct soc_camera_device *icd,
1494                                   struct v4l2_crop *a)
1495 {
1496         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1497
1498         a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1499         a->c = cam->subrect;
1500
1501         return 0;
1502 }
1503
1504 /*
1505  * Calculate real client output window by applying new scales to the current
1506  * client crop. New scales are calculated from the requested output format and
1507  * CEU crop, mapped backed onto the client input (subrect).
1508  */
1509 static void calculate_client_output(struct soc_camera_device *icd,
1510                 struct v4l2_pix_format *pix, struct v4l2_mbus_framefmt *mf)
1511 {
1512         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1513         struct device *dev = icd->dev.parent;
1514         struct v4l2_rect *cam_subrect = &cam->subrect;
1515         unsigned int scale_v, scale_h;
1516
1517         if (cam_subrect->width == cam->rect.width &&
1518             cam_subrect->height == cam->rect.height) {
1519                 /* No sub-cropping */
1520                 mf->width       = pix->width;
1521                 mf->height      = pix->height;
1522                 return;
1523         }
1524
1525         /* 1.-2. Current camera scales and subwin - cached. */
1526
1527         dev_geo(dev, "2: subwin %ux%u@%u:%u\n",
1528                 cam_subrect->width, cam_subrect->height,
1529                 cam_subrect->left, cam_subrect->top);
1530
1531         /*
1532          * 3. Calculate new combined scales from input sub-window to requested
1533          *    user window.
1534          */
1535
1536         /*
1537          * TODO: CEU cannot scale images larger than VGA to smaller than SubQCIF
1538          * (128x96) or larger than VGA
1539          */
1540         scale_h = calc_generic_scale(cam_subrect->width, pix->width);
1541         scale_v = calc_generic_scale(cam_subrect->height, pix->height);
1542
1543         dev_geo(dev, "3: scales %u:%u\n", scale_h, scale_v);
1544
1545         /*
1546          * 4. Calculate client output window by applying combined scales to real
1547          *    input window.
1548          */
1549         mf->width       = scale_down(cam->rect.width, scale_h);
1550         mf->height      = scale_down(cam->rect.height, scale_v);
1551 }
1552
1553 /* Similar to set_crop multistage iterative algorithm */
1554 static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
1555                                  struct v4l2_format *f)
1556 {
1557         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1558         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1559         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1560         struct v4l2_pix_format *pix = &f->fmt.pix;
1561         struct v4l2_mbus_framefmt mf;
1562         struct device *dev = icd->dev.parent;
1563         __u32 pixfmt = pix->pixelformat;
1564         const struct soc_camera_format_xlate *xlate;
1565         /* Keep Compiler Happy */
1566         unsigned int ceu_sub_width = 0, ceu_sub_height = 0;
1567         u16 scale_v, scale_h;
1568         int ret;
1569         bool image_mode;
1570         enum v4l2_field field;
1571
1572         dev_geo(dev, "S_FMT(pix=0x%x, %ux%u)\n", pixfmt, pix->width, pix->height);
1573
1574         switch (pix->field) {
1575         default:
1576                 pix->field = V4L2_FIELD_NONE;
1577                 /* fall-through */
1578         case V4L2_FIELD_INTERLACED_TB:
1579         case V4L2_FIELD_INTERLACED_BT:
1580         case V4L2_FIELD_NONE:
1581                 field = pix->field;
1582                 break;
1583         case V4L2_FIELD_INTERLACED:
1584                 field = V4L2_FIELD_INTERLACED_TB;
1585                 break;
1586         }
1587
1588         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1589         if (!xlate) {
1590                 dev_warn(dev, "Format %x not found\n", pixfmt);
1591                 return -EINVAL;
1592         }
1593
1594         /* 1.-4. Calculate client output geometry */
1595         calculate_client_output(icd, &f->fmt.pix, &mf);
1596         mf.field        = pix->field;
1597         mf.colorspace   = pix->colorspace;
1598         mf.code         = xlate->code;
1599
1600         switch (pixfmt) {
1601         case V4L2_PIX_FMT_NV12:
1602         case V4L2_PIX_FMT_NV21:
1603         case V4L2_PIX_FMT_NV16:
1604         case V4L2_PIX_FMT_NV61:
1605                 image_mode = true;
1606                 break;
1607         default:
1608                 image_mode = false;
1609         }
1610
1611         dev_geo(dev, "4: request camera output %ux%u\n", mf.width, mf.height);
1612
1613         /* 5. - 9. */
1614         ret = client_scale(icd, &mf, &ceu_sub_width, &ceu_sub_height,
1615                            image_mode && V4L2_FIELD_NONE == field);
1616
1617         dev_geo(dev, "5-9: client scale return %d\n", ret);
1618
1619         /* Done with the camera. Now see if we can improve the result */
1620
1621         dev_geo(dev, "fmt %ux%u, requested %ux%u\n",
1622                 mf.width, mf.height, pix->width, pix->height);
1623         if (ret < 0)
1624                 return ret;
1625
1626         if (mf.code != xlate->code)
1627                 return -EINVAL;
1628
1629         /* 9. Prepare CEU crop */
1630         cam->width = mf.width;
1631         cam->height = mf.height;
1632
1633         /* 10. Use CEU scaling to scale to the requested user window. */
1634
1635         /* We cannot scale up */
1636         if (pix->width > ceu_sub_width)
1637                 ceu_sub_width = pix->width;
1638
1639         if (pix->height > ceu_sub_height)
1640                 ceu_sub_height = pix->height;
1641
1642         pix->colorspace = mf.colorspace;
1643
1644         if (image_mode) {
1645                 /* Scale pix->{width x height} down to width x height */
1646                 scale_h         = calc_scale(ceu_sub_width, &pix->width);
1647                 scale_v         = calc_scale(ceu_sub_height, &pix->height);
1648         } else {
1649                 pix->width      = ceu_sub_width;
1650                 pix->height     = ceu_sub_height;
1651                 scale_h         = 0;
1652                 scale_v         = 0;
1653         }
1654
1655         pcdev->cflcr = scale_h | (scale_v << 16);
1656
1657         /*
1658          * We have calculated CFLCR, the actual configuration will be performed
1659          * in sh_mobile_ceu_set_bus_param()
1660          */
1661
1662         dev_geo(dev, "10: W: %u : 0x%x = %u, H: %u : 0x%x = %u\n",
1663                 ceu_sub_width, scale_h, pix->width,
1664                 ceu_sub_height, scale_v, pix->height);
1665
1666         cam->code               = xlate->code;
1667         icd->current_fmt        = xlate;
1668
1669         pcdev->field = field;
1670         pcdev->image_mode = image_mode;
1671
1672         return 0;
1673 }
1674
1675 static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
1676                                  struct v4l2_format *f)
1677 {
1678         const struct soc_camera_format_xlate *xlate;
1679         struct v4l2_pix_format *pix = &f->fmt.pix;
1680         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1681         struct v4l2_mbus_framefmt mf;
1682         __u32 pixfmt = pix->pixelformat;
1683         int width, height;
1684         int ret;
1685
1686         dev_geo(icd->dev.parent, "TRY_FMT(pix=0x%x, %ux%u)\n",
1687                  pixfmt, pix->width, pix->height);
1688
1689         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1690         if (!xlate) {
1691                 dev_warn(icd->dev.parent, "Format %x not found\n", pixfmt);
1692                 return -EINVAL;
1693         }
1694
1695         /* FIXME: calculate using depth and bus width */
1696
1697         v4l_bound_align_image(&pix->width, 2, 2560, 1,
1698                               &pix->height, 4, 1920, 2, 0);
1699
1700         width = pix->width;
1701         height = pix->height;
1702
1703         /* limit to sensor capabilities */
1704         mf.width        = pix->width;
1705         mf.height       = pix->height;
1706         mf.field        = pix->field;
1707         mf.code         = xlate->code;
1708         mf.colorspace   = pix->colorspace;
1709
1710         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video, try_mbus_fmt, &mf);
1711         if (ret < 0)
1712                 return ret;
1713
1714         pix->width      = mf.width;
1715         pix->height     = mf.height;
1716         pix->field      = mf.field;
1717         pix->colorspace = mf.colorspace;
1718
1719         switch (pixfmt) {
1720         case V4L2_PIX_FMT_NV12:
1721         case V4L2_PIX_FMT_NV21:
1722         case V4L2_PIX_FMT_NV16:
1723         case V4L2_PIX_FMT_NV61:
1724                 /* FIXME: check against rect_max after converting soc-camera */
1725                 /* We can scale precisely, need a bigger image from camera */
1726                 if (pix->width < width || pix->height < height) {
1727                         /*
1728                          * We presume, the sensor behaves sanely, i.e., if
1729                          * requested a bigger rectangle, it will not return a
1730                          * smaller one.
1731                          */
1732                         mf.width = 2560;
1733                         mf.height = 1920;
1734                         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
1735                                                          try_mbus_fmt, &mf);
1736                         if (ret < 0) {
1737                                 /* Shouldn't actually happen... */
1738                                 dev_err(icd->dev.parent,
1739                                         "FIXME: client try_fmt() = %d\n", ret);
1740                                 return ret;
1741                         }
1742                 }
1743                 /* We will scale exactly */
1744                 if (mf.width > width)
1745                         pix->width = width;
1746                 if (mf.height > height)
1747                         pix->height = height;
1748         }
1749
1750         dev_geo(icd->dev.parent, "%s(): return %d, fmt 0x%x, %ux%u\n",
1751                 __func__, ret, pix->pixelformat, pix->width, pix->height);
1752
1753         return ret;
1754 }
1755
1756 static int sh_mobile_ceu_set_livecrop(struct soc_camera_device *icd,
1757                                       struct v4l2_crop *a)
1758 {
1759         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1760         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1761         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1762         u32 out_width = icd->user_width, out_height = icd->user_height;
1763         int ret;
1764
1765         /* Freeze queue */
1766         pcdev->frozen = 1;
1767         /* Wait for frame */
1768         ret = wait_for_completion_interruptible(&pcdev->complete);
1769         /* Stop the client */
1770         ret = v4l2_subdev_call(sd, video, s_stream, 0);
1771         if (ret < 0)
1772                 dev_warn(icd->dev.parent,
1773                          "Client failed to stop the stream: %d\n", ret);
1774         else
1775                 /* Do the crop, if it fails, there's nothing more we can do */
1776                 sh_mobile_ceu_set_crop(icd, a);
1777
1778         dev_geo(icd->dev.parent, "Output after crop: %ux%u\n", icd->user_width, icd->user_height);
1779
1780         if (icd->user_width != out_width || icd->user_height != out_height) {
1781                 struct v4l2_format f = {
1782                         .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1783                         .fmt.pix        = {
1784                                 .width          = out_width,
1785                                 .height         = out_height,
1786                                 .pixelformat    = icd->current_fmt->host_fmt->fourcc,
1787                                 .field          = pcdev->field,
1788                                 .colorspace     = icd->colorspace,
1789                         },
1790                 };
1791                 ret = sh_mobile_ceu_set_fmt(icd, &f);
1792                 if (!ret && (out_width != f.fmt.pix.width ||
1793                              out_height != f.fmt.pix.height))
1794                         ret = -EINVAL;
1795                 if (!ret) {
1796                         icd->user_width         = out_width;
1797                         icd->user_height        = out_height;
1798                         ret = sh_mobile_ceu_set_bus_param(icd,
1799                                         icd->current_fmt->host_fmt->fourcc);
1800                 }
1801         }
1802
1803         /* Thaw the queue */
1804         pcdev->frozen = 0;
1805         spin_lock_irq(&pcdev->lock);
1806         sh_mobile_ceu_capture(pcdev);
1807         spin_unlock_irq(&pcdev->lock);
1808         /* Start the client */
1809         ret = v4l2_subdev_call(sd, video, s_stream, 1);
1810         return ret;
1811 }
1812
1813 static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
1814 {
1815         struct soc_camera_device *icd = file->private_data;
1816
1817         return vb2_poll(&icd->vb2_vidq, file, pt);
1818 }
1819
1820 static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
1821                                   struct v4l2_capability *cap)
1822 {
1823         strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
1824         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1825         return 0;
1826 }
1827
1828 static int sh_mobile_ceu_init_videobuf(struct vb2_queue *q,
1829                                        struct soc_camera_device *icd)
1830 {
1831         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1832         q->io_modes = VB2_MMAP | VB2_USERPTR;
1833         q->drv_priv = icd;
1834         q->ops = &sh_mobile_ceu_videobuf_ops;
1835         q->mem_ops = &vb2_dma_contig_memops;
1836         q->buf_struct_size = sizeof(struct sh_mobile_ceu_buffer);
1837
1838         return vb2_queue_init(q);
1839 }
1840
1841 static int sh_mobile_ceu_get_ctrl(struct soc_camera_device *icd,
1842                                   struct v4l2_control *ctrl)
1843 {
1844         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1845         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1846         u32 val;
1847
1848         switch (ctrl->id) {
1849         case V4L2_CID_SHARPNESS:
1850                 val = ceu_read(pcdev, CLFCR);
1851                 ctrl->value = val ^ 1;
1852                 return 0;
1853         }
1854         return -ENOIOCTLCMD;
1855 }
1856
1857 static int sh_mobile_ceu_set_ctrl(struct soc_camera_device *icd,
1858                                   struct v4l2_control *ctrl)
1859 {
1860         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1861         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1862
1863         switch (ctrl->id) {
1864         case V4L2_CID_SHARPNESS:
1865                 switch (icd->current_fmt->host_fmt->fourcc) {
1866                 case V4L2_PIX_FMT_NV12:
1867                 case V4L2_PIX_FMT_NV21:
1868                 case V4L2_PIX_FMT_NV16:
1869                 case V4L2_PIX_FMT_NV61:
1870                         ceu_write(pcdev, CLFCR, !ctrl->value);
1871                         return 0;
1872                 }
1873                 return -EINVAL;
1874         }
1875         return -ENOIOCTLCMD;
1876 }
1877
1878 static const struct v4l2_queryctrl sh_mobile_ceu_controls[] = {
1879         {
1880                 .id             = V4L2_CID_SHARPNESS,
1881                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
1882                 .name           = "Low-pass filter",
1883                 .minimum        = 0,
1884                 .maximum        = 1,
1885                 .step           = 1,
1886                 .default_value  = 0,
1887         },
1888 };
1889
1890 static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
1891         .owner          = THIS_MODULE,
1892         .add            = sh_mobile_ceu_add_device,
1893         .remove         = sh_mobile_ceu_remove_device,
1894         .get_formats    = sh_mobile_ceu_get_formats,
1895         .put_formats    = sh_mobile_ceu_put_formats,
1896         .get_crop       = sh_mobile_ceu_get_crop,
1897         .set_crop       = sh_mobile_ceu_set_crop,
1898         .set_livecrop   = sh_mobile_ceu_set_livecrop,
1899         .set_fmt        = sh_mobile_ceu_set_fmt,
1900         .try_fmt        = sh_mobile_ceu_try_fmt,
1901         .set_ctrl       = sh_mobile_ceu_set_ctrl,
1902         .get_ctrl       = sh_mobile_ceu_get_ctrl,
1903         .poll           = sh_mobile_ceu_poll,
1904         .querycap       = sh_mobile_ceu_querycap,
1905         .set_bus_param  = sh_mobile_ceu_set_bus_param,
1906         .init_videobuf2 = sh_mobile_ceu_init_videobuf,
1907         .controls       = sh_mobile_ceu_controls,
1908         .num_controls   = ARRAY_SIZE(sh_mobile_ceu_controls),
1909 };
1910
1911 struct bus_wait {
1912         struct notifier_block   notifier;
1913         struct completion       completion;
1914         struct device           *dev;
1915 };
1916
1917 static int bus_notify(struct notifier_block *nb,
1918                       unsigned long action, void *data)
1919 {
1920         struct device *dev = data;
1921         struct bus_wait *wait = container_of(nb, struct bus_wait, notifier);
1922
1923         if (wait->dev != dev)
1924                 return NOTIFY_DONE;
1925
1926         switch (action) {
1927         case BUS_NOTIFY_UNBOUND_DRIVER:
1928                 /* Protect from module unloading */
1929                 wait_for_completion(&wait->completion);
1930                 return NOTIFY_OK;
1931         }
1932         return NOTIFY_DONE;
1933 }
1934
1935 static int __devinit sh_mobile_ceu_probe(struct platform_device *pdev)
1936 {
1937         struct sh_mobile_ceu_dev *pcdev;
1938         struct resource *res;
1939         void __iomem *base;
1940         unsigned int irq;
1941         int err = 0;
1942         struct bus_wait wait = {
1943                 .completion = COMPLETION_INITIALIZER_ONSTACK(wait.completion),
1944                 .notifier.notifier_call = bus_notify,
1945         };
1946         struct device *csi2;
1947
1948         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1949         irq = platform_get_irq(pdev, 0);
1950         if (!res || (int)irq <= 0) {
1951                 dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
1952                 err = -ENODEV;
1953                 goto exit;
1954         }
1955
1956         pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
1957         if (!pcdev) {
1958                 dev_err(&pdev->dev, "Could not allocate pcdev\n");
1959                 err = -ENOMEM;
1960                 goto exit;
1961         }
1962
1963         INIT_LIST_HEAD(&pcdev->capture);
1964         spin_lock_init(&pcdev->lock);
1965         init_completion(&pcdev->complete);
1966
1967         pcdev->pdata = pdev->dev.platform_data;
1968         if (!pcdev->pdata) {
1969                 err = -EINVAL;
1970                 dev_err(&pdev->dev, "CEU platform data not set.\n");
1971                 goto exit_kfree;
1972         }
1973
1974         base = ioremap_nocache(res->start, resource_size(res));
1975         if (!base) {
1976                 err = -ENXIO;
1977                 dev_err(&pdev->dev, "Unable to ioremap CEU registers.\n");
1978                 goto exit_kfree;
1979         }
1980
1981         pcdev->irq = irq;
1982         pcdev->base = base;
1983         pcdev->video_limit = 0; /* only enabled if second resource exists */
1984
1985         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1986         if (res) {
1987                 err = dma_declare_coherent_memory(&pdev->dev, res->start,
1988                                                   res->start,
1989                                                   resource_size(res),
1990                                                   DMA_MEMORY_MAP |
1991                                                   DMA_MEMORY_EXCLUSIVE);
1992                 if (!err) {
1993                         dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
1994                         err = -ENXIO;
1995                         goto exit_iounmap;
1996                 }
1997
1998                 pcdev->video_limit = resource_size(res);
1999         }
2000
2001         /* request irq */
2002         err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED,
2003                           dev_name(&pdev->dev), pcdev);
2004         if (err) {
2005                 dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
2006                 goto exit_release_mem;
2007         }
2008
2009         pm_suspend_ignore_children(&pdev->dev, true);
2010         pm_runtime_enable(&pdev->dev);
2011         pm_runtime_resume(&pdev->dev);
2012
2013         pcdev->ici.priv = pcdev;
2014         pcdev->ici.v4l2_dev.dev = &pdev->dev;
2015         pcdev->ici.nr = pdev->id;
2016         pcdev->ici.drv_name = dev_name(&pdev->dev);
2017         pcdev->ici.ops = &sh_mobile_ceu_host_ops;
2018
2019         /* CSI2 interfacing */
2020         csi2 = pcdev->pdata->csi2_dev;
2021         if (csi2) {
2022                 wait.dev = csi2;
2023
2024                 err = bus_register_notifier(&platform_bus_type, &wait.notifier);
2025                 if (err < 0)
2026                         goto exit_free_clk;
2027
2028                 /*
2029                  * From this point the driver module will not unload, until
2030                  * we complete the completion.
2031                  */
2032
2033                 if (!csi2->driver) {
2034                         complete(&wait.completion);
2035                         /* Either too late, or probing failed */
2036                         bus_unregister_notifier(&platform_bus_type, &wait.notifier);
2037                         err = -ENXIO;
2038                         goto exit_free_clk;
2039                 }
2040
2041                 /*
2042                  * The module is still loaded, in the worst case it is hanging
2043                  * in device release on our completion. So, _now_ dereferencing
2044                  * the "owner" is safe!
2045                  */
2046
2047                 err = try_module_get(csi2->driver->owner);
2048
2049                 /* Let notifier complete, if it has been locked */
2050                 complete(&wait.completion);
2051                 bus_unregister_notifier(&platform_bus_type, &wait.notifier);
2052                 if (!err) {
2053                         err = -ENODEV;
2054                         goto exit_free_clk;
2055                 }
2056         }
2057
2058         pcdev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
2059         if (IS_ERR(pcdev->alloc_ctx)) {
2060                 err = PTR_ERR(pcdev->alloc_ctx);
2061                 goto exit_module_put;
2062         }
2063
2064         err = soc_camera_host_register(&pcdev->ici);
2065         if (err)
2066                 goto exit_free_ctx;
2067
2068         return 0;
2069
2070 exit_free_ctx:
2071         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
2072 exit_module_put:
2073         if (csi2 && csi2->driver)
2074                 module_put(csi2->driver->owner);
2075 exit_free_clk:
2076         pm_runtime_disable(&pdev->dev);
2077         free_irq(pcdev->irq, pcdev);
2078 exit_release_mem:
2079         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
2080                 dma_release_declared_memory(&pdev->dev);
2081 exit_iounmap:
2082         iounmap(base);
2083 exit_kfree:
2084         kfree(pcdev);
2085 exit:
2086         return err;
2087 }
2088
2089 static int __devexit sh_mobile_ceu_remove(struct platform_device *pdev)
2090 {
2091         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
2092         struct sh_mobile_ceu_dev *pcdev = container_of(soc_host,
2093                                         struct sh_mobile_ceu_dev, ici);
2094         struct device *csi2 = pcdev->pdata->csi2_dev;
2095
2096         soc_camera_host_unregister(soc_host);
2097         pm_runtime_disable(&pdev->dev);
2098         free_irq(pcdev->irq, pcdev);
2099         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
2100                 dma_release_declared_memory(&pdev->dev);
2101         iounmap(pcdev->base);
2102         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
2103         if (csi2 && csi2->driver)
2104                 module_put(csi2->driver->owner);
2105         kfree(pcdev);
2106
2107         return 0;
2108 }
2109
2110 static int sh_mobile_ceu_runtime_nop(struct device *dev)
2111 {
2112         /* Runtime PM callback shared between ->runtime_suspend()
2113          * and ->runtime_resume(). Simply returns success.
2114          *
2115          * This driver re-initializes all registers after
2116          * pm_runtime_get_sync() anyway so there is no need
2117          * to save and restore registers here.
2118          */
2119         return 0;
2120 }
2121
2122 static const struct dev_pm_ops sh_mobile_ceu_dev_pm_ops = {
2123         .runtime_suspend = sh_mobile_ceu_runtime_nop,
2124         .runtime_resume = sh_mobile_ceu_runtime_nop,
2125 };
2126
2127 static struct platform_driver sh_mobile_ceu_driver = {
2128         .driver         = {
2129                 .name   = "sh_mobile_ceu",
2130                 .pm     = &sh_mobile_ceu_dev_pm_ops,
2131         },
2132         .probe          = sh_mobile_ceu_probe,
2133         .remove         = __devexit_p(sh_mobile_ceu_remove),
2134 };
2135
2136 static int __init sh_mobile_ceu_init(void)
2137 {
2138         /* Whatever return code */
2139         request_module("sh_mobile_csi2");
2140         return platform_driver_register(&sh_mobile_ceu_driver);
2141 }
2142
2143 static void __exit sh_mobile_ceu_exit(void)
2144 {
2145         platform_driver_unregister(&sh_mobile_ceu_driver);
2146 }
2147
2148 module_init(sh_mobile_ceu_init);
2149 module_exit(sh_mobile_ceu_exit);
2150
2151 MODULE_DESCRIPTION("SuperH Mobile CEU driver");
2152 MODULE_AUTHOR("Magnus Damm");
2153 MODULE_LICENSE("GPL");
2154 MODULE_VERSION("0.0.6");
2155 MODULE_ALIAS("platform:sh_mobile_ceu");