drivers/media/video/sh_mobile_ceu_camera.c

   1 /*
   2  * V4L2 Driver for SuperH Mobile CEU interface
   3  *
   4  * Copyright (C) 2008 Magnus Damm
   5  *
   6  * Based on V4L2 Driver for PXA camera host - "pxa_camera.c",
   7  *
   8  * Copyright (C) 2006, Sascha Hauer, Pengutronix
   9  * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  */
  16
  17 #include <linux/init.h>
  18 #include <linux/module.h>
  19 #include <linux/io.h>
  20 #include <linux/completion.h>
  21 #include <linux/delay.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/errno.h>
  24 #include <linux/fs.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/kernel.h>
  27 #include <linux/mm.h>
  28 #include <linux/moduleparam.h>
  29 #include <linux/time.h>
  30 #include <linux/slab.h>
  31 #include <linux/device.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/videodev2.h>
  34 #include <linux/pm_runtime.h>
  35 #include <linux/sched.h>
  36
  37 #include <media/v4l2-common.h>
  38 #include <media/v4l2-dev.h>
  39 #include <media/soc_camera.h>
  40 #include <media/sh_mobile_ceu.h>
  41 #include <media/sh_mobile_csi2.h>
  42 #include <media/videobuf2-dma-contig.h>
  43 #include <media/v4l2-mediabus.h>
  44 #include <media/soc_mediabus.h>
  45
  46 /* register offsets for sh7722 / sh7723 */
  47
  48 #define CAPSR  0x00 /* Capture start register */
  49 #define CAPCR  0x04 /* Capture control register */
  50 #define CAMCR  0x08 /* Capture interface control register */
  51 #define CMCYR  0x0c /* Capture interface cycle  register */
  52 #define CAMOR  0x10 /* Capture interface offset register */
  53 #define CAPWR  0x14 /* Capture interface width register */
  54 #define CAIFR  0x18 /* Capture interface input format register */
  55 #define CSTCR  0x20 /* Camera strobe control register (<= sh7722) */
  56 #define CSECR  0x24 /* Camera strobe emission count register (<= sh7722) */
  57 #define CRCNTR 0x28 /* CEU register control register */
  58 #define CRCMPR 0x2c /* CEU register forcible control register */
  59 #define CFLCR  0x30 /* Capture filter control register */
  60 #define CFSZR  0x34 /* Capture filter size clip register */
  61 #define CDWDR  0x38 /* Capture destination width register */
  62 #define CDAYR  0x3c /* Capture data address Y register */
  63 #define CDACR  0x40 /* Capture data address C register */
  64 #define CDBYR  0x44 /* Capture data bottom-field address Y register */
  65 #define CDBCR  0x48 /* Capture data bottom-field address C register */
  66 #define CBDSR  0x4c /* Capture bundle destination size register */
  67 #define CFWCR  0x5c /* Firewall operation control register */
  68 #define CLFCR  0x60 /* Capture low-pass filter control register */
  69 #define CDOCR  0x64 /* Capture data output control register */
  70 #define CDDCR  0x68 /* Capture data complexity level register */
  71 #define CDDAR  0x6c /* Capture data complexity level address register */
  72 #define CEIER  0x70 /* Capture event interrupt enable register */
  73 #define CETCR  0x74 /* Capture event flag clear register */
  74 #define CSTSR  0x7c /* Capture status register */
  75 #define CSRTR  0x80 /* Capture software reset register */
  76 #define CDSSR  0x84 /* Capture data size register */
  77 #define CDAYR2 0x90 /* Capture data address Y register 2 */
  78 #define CDACR2 0x94 /* Capture data address C register 2 */
  79 #define CDBYR2 0x98 /* Capture data bottom-field address Y register 2 */
  80 #define CDBCR2 0x9c /* Capture data bottom-field address C register 2 */
  81
  82 #undef DEBUG_GEOMETRY
  83 #ifdef DEBUG_GEOMETRY
  84 #define dev_geo dev_info
  85 #else
  86 #define dev_geo dev_dbg
  87 #endif
  88
  89 /* per video frame buffer */
  90 struct sh_mobile_ceu_buffer {
  91         struct vb2_buffer vb; /* v4l buffer must be first */
  92         struct list_head queue;
  93         enum v4l2_mbus_pixelcode code;
  94 };
  95
  96 struct sh_mobile_ceu_dev {
  97         struct soc_camera_host ici;
  98         struct soc_camera_device *icd;
  99         struct platform_device *csi2_pdev;
 100
 101         unsigned int irq;
 102         void __iomem *base;
 103         unsigned long video_limit;
 104
 105         spinlock_t lock;                /* Protects video buffer lists */
 106         struct list_head capture;
 107         struct vb2_buffer *active;
 108         struct vb2_alloc_ctx *alloc_ctx;
 109
 110         struct sh_mobile_ceu_info *pdata;
 111         struct completion complete;
 112
 113         u32 cflcr;
 114
 115         enum v4l2_field field;
 116         int sequence;
 117
 118         unsigned int image_mode:1;
 119         unsigned int is_16bit:1;
 120         unsigned int frozen:1;
 121 };
 122
 123 struct sh_mobile_ceu_cam {
 124         /* CEU offsets within scaled by the CEU camera output */
 125         unsigned int ceu_left;
 126         unsigned int ceu_top;
 127         /* Client output, as seen by the CEU */
 128         unsigned int width;
 129         unsigned int height;
 130         /*
 131          * User window from S_CROP / G_CROP, produced by client cropping and
 132          * scaling, CEU scaling and CEU cropping, mapped back onto the client
 133          * input window
 134          */
 135         struct v4l2_rect subrect;
 136         /* Camera cropping rectangle */
 137         struct v4l2_rect rect;
 138         const struct soc_mbus_pixelfmt *extra_fmt;
 139         enum v4l2_mbus_pixelcode code;
 140 };
 141
 142 static struct sh_mobile_ceu_buffer *to_ceu_vb(struct vb2_buffer *vb)
 143 {
 144         return container_of(vb, struct sh_mobile_ceu_buffer, vb);
 145 }
 146
 147 static unsigned long make_bus_param(struct sh_mobile_ceu_dev *pcdev)
 148 {
 149         unsigned long flags;
 150
 151         flags = SOCAM_MASTER |
 152                 SOCAM_PCLK_SAMPLE_RISING |
 153                 SOCAM_HSYNC_ACTIVE_HIGH |
 154                 SOCAM_HSYNC_ACTIVE_LOW |
 155                 SOCAM_VSYNC_ACTIVE_HIGH |
 156                 SOCAM_VSYNC_ACTIVE_LOW |
 157                 SOCAM_DATA_ACTIVE_HIGH;
 158
 159         if (pcdev->pdata->flags & SH_CEU_FLAG_USE_8BIT_BUS)
 160                 flags |= SOCAM_DATAWIDTH_8;
 161
 162         if (pcdev->pdata->flags & SH_CEU_FLAG_USE_16BIT_BUS)
 163                 flags |= SOCAM_DATAWIDTH_16;
 164
 165         if (flags & SOCAM_DATAWIDTH_MASK)
 166                 return flags;
 167
 168         return 0;
 169 }
 170
 171 static void ceu_write(struct sh_mobile_ceu_dev *priv,
 172                       unsigned long reg_offs, u32 data)
 173 {
 174         iowrite32(data, priv->base + reg_offs);
 175 }
 176
 177 static u32 ceu_read(struct sh_mobile_ceu_dev *priv, unsigned long reg_offs)
 178 {
 179         return ioread32(priv->base + reg_offs);
 180 }
 181
 182 static int sh_mobile_ceu_soft_reset(struct sh_mobile_ceu_dev *pcdev)
 183 {
 184         int i, success = 0;
 185         struct soc_camera_device *icd = pcdev->icd;
 186
 187         ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
 188
 189         /* wait CSTSR.CPTON bit */
 190         for (i = 0; i < 1000; i++) {
 191                 if (!(ceu_read(pcdev, CSTSR) & 1)) {
 192                         success++;
 193                         break;
 194                 }
 195                 udelay(1);
 196         }
 197
 198         /* wait CAPSR.CPKIL bit */
 199         for (i = 0; i < 1000; i++) {
 200                 if (!(ceu_read(pcdev, CAPSR) & (1 << 16))) {
 201                         success++;
 202                         break;
 203                 }
 204                 udelay(1);
 205         }
 206
 207
 208         if (2 != success) {
 209                 dev_warn(icd->pdev, "soft reset time out\n");
 210                 return -EIO;
 211         }
 212
 213         return 0;
 214 }
 215
 216 /*
 217  *  Videobuf operations
 218  */
 219 static int sh_mobile_ceu_videobuf_setup(struct vb2_queue *vq,
 220                         unsigned int *count, unsigned int *num_planes,
 221                         unsigned long sizes[], void *alloc_ctxs[])
 222 {
 223         struct soc_camera_device *icd = container_of(vq, struct soc_camera_device, vb2_vidq);
 224         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 225         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 226         int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 227                                                 icd->current_fmt->host_fmt);
 228
 229         if (bytes_per_line < 0)
 230                 return bytes_per_line;
 231
 232         *num_planes = 1;
 233
 234         pcdev->sequence = 0;
 235         sizes[0] = bytes_per_line * icd->user_height;
 236         alloc_ctxs[0] = pcdev->alloc_ctx;
 237
 238         if (!*count)
 239                 *count = 2;
 240
 241         if (pcdev->video_limit) {
 242                 if (PAGE_ALIGN(sizes[0]) * *count > pcdev->video_limit)
 243                         *count = pcdev->video_limit / PAGE_ALIGN(sizes[0]);
 244         }
 245
 246         dev_dbg(icd->parent, "count=%d, size=%lu\n", *count, sizes[0]);
 247
 248         return 0;
 249 }
 250
 251 #define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */
 252 #define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */
 253 #define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */
 254 #define CEU_CEIER_VBP   (1 << 20) /* vbp error */
 255 #define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */
 256 #define CEU_CEIER_MASK (CEU_CEIER_CPEIE | CEU_CEIER_VBP)
 257
 258
 259 /*
 260  * return value doesn't reflex the success/failure to queue the new buffer,
 261  * but rather the status of the previous buffer.
 262  */
 263 static int sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
 264 {
 265         struct soc_camera_device *icd = pcdev->icd;
 266         dma_addr_t phys_addr_top, phys_addr_bottom;
 267         unsigned long top1, top2;
 268         unsigned long bottom1, bottom2;
 269         u32 status;
 270         int ret = 0;
 271
 272         /*
 273          * The hardware is _very_ picky about this sequence. Especially
 274          * the CEU_CETCR_MAGIC value. It seems like we need to acknowledge
 275          * several not-so-well documented interrupt sources in CETCR.
 276          */
 277         ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_MASK);
 278         status = ceu_read(pcdev, CETCR);
 279         ceu_write(pcdev, CETCR, ~status & CEU_CETCR_MAGIC);
 280         if (!pcdev->frozen)
 281                 ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_MASK);
 282         ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP);
 283         ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW);
 284
 285         /*
 286          * When a VBP interrupt occurs, a capture end interrupt does not occur
 287          * and the image of that frame is not captured correctly. So, soft reset
 288          * is needed here.
 289          */
 290         if (status & CEU_CEIER_VBP) {
 291                 sh_mobile_ceu_soft_reset(pcdev);
 292                 ret = -EIO;
 293         }
 294
 295         if (pcdev->frozen) {
 296                 complete(&pcdev->complete);
 297                 return ret;
 298         }
 299
 300         if (!pcdev->active)
 301                 return ret;
 302
 303         if (V4L2_FIELD_INTERLACED_BT == pcdev->field) {
 304                 top1    = CDBYR;
 305                 top2    = CDBCR;
 306                 bottom1 = CDAYR;
 307                 bottom2 = CDACR;
 308         } else {
 309                 top1    = CDAYR;
 310                 top2    = CDACR;
 311                 bottom1 = CDBYR;
 312                 bottom2 = CDBCR;
 313         }
 314
 315         phys_addr_top = vb2_dma_contig_plane_paddr(pcdev->active, 0);
 316
 317         ceu_write(pcdev, top1, phys_addr_top);
 318         if (V4L2_FIELD_NONE != pcdev->field) {
 319                 phys_addr_bottom = phys_addr_top + icd->user_width;
 320                 ceu_write(pcdev, bottom1, phys_addr_bottom);
 321         }
 322
 323         switch (icd->current_fmt->host_fmt->fourcc) {
 324         case V4L2_PIX_FMT_NV12:
 325         case V4L2_PIX_FMT_NV21:
 326         case V4L2_PIX_FMT_NV16:
 327         case V4L2_PIX_FMT_NV61:
 328                 phys_addr_top += icd->user_width *
 329                         icd->user_height;
 330                 ceu_write(pcdev, top2, phys_addr_top);
 331                 if (V4L2_FIELD_NONE != pcdev->field) {
 332                         phys_addr_bottom = phys_addr_top + icd->user_width;
 333                         ceu_write(pcdev, bottom2, phys_addr_bottom);
 334                 }
 335         }
 336
 337         ceu_write(pcdev, CAPSR, 0x1); /* start capture */
 338
 339         return ret;
 340 }
 341
 342 static int sh_mobile_ceu_videobuf_prepare(struct vb2_buffer *vb)
 343 {
 344         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
 345         struct sh_mobile_ceu_buffer *buf;
 346         int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 347                                                 icd->current_fmt->host_fmt);
 348         unsigned long size;
 349
 350         if (bytes_per_line < 0)
 351                 return bytes_per_line;
 352
 353         buf = to_ceu_vb(vb);
 354
 355         dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
 356                 vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
 357
 358         /* Added list head initialization on alloc */
 359         WARN(!list_empty(&buf->queue), "Buffer %p on queue!\n", vb);
 360
 361 #ifdef DEBUG
 362         /*
 363          * This can be useful if you want to see if we actually fill
 364          * the buffer with something
 365          */
 366         if (vb2_plane_vaddr(vb, 0))
 367                 memset(vb2_plane_vaddr(vb, 0), 0xaa, vb2_get_plane_payload(vb, 0));
 368 #endif
 369
 370         BUG_ON(NULL == icd->current_fmt);
 371
 372         size = icd->user_height * bytes_per_line;
 373
 374         if (vb2_plane_size(vb, 0) < size) {
 375                 dev_err(icd->parent, "Buffer too small (%lu < %lu)\n",
 376                         vb2_plane_size(vb, 0), size);
 377                 return -ENOBUFS;
 378         }
 379
 380         vb2_set_plane_payload(vb, 0, size);
 381
 382         return 0;
 383 }
 384
 385 static void sh_mobile_ceu_videobuf_queue(struct vb2_buffer *vb)
 386 {
 387         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
 388         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 389         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 390         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb);
 391
 392         dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
 393                 vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
 394
 395         spin_lock_irq(&pcdev->lock);
 396         list_add_tail(&buf->queue, &pcdev->capture);
 397
 398         if (!pcdev->active) {
 399                 /*
 400                  * Because there were no active buffer at this moment,
 401                  * we are not interested in the return value of
 402                  * sh_mobile_ceu_capture here.
 403                  */
 404                 pcdev->active = vb;
 405                 sh_mobile_ceu_capture(pcdev);
 406         }
 407         spin_unlock_irq(&pcdev->lock);
 408 }
 409
 410 static void sh_mobile_ceu_videobuf_release(struct vb2_buffer *vb)
 411 {
 412         struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
 413         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 414         struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb);
 415         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 416
 417         spin_lock_irq(&pcdev->lock);
 418
 419         if (pcdev->active == vb) {
 420                 /* disable capture (release DMA buffer), reset */
 421                 ceu_write(pcdev, CAPSR, 1 << 16);
 422                 pcdev->active = NULL;
 423         }
 424
 425         /*
 426          * Doesn't hurt also if the list is empty, but it hurts, if queuing the
 427          * buffer failed, and .buf_init() hasn't been called
 428          */
 429         if (buf->queue.next)
 430                 list_del_init(&buf->queue);
 431
 432         spin_unlock_irq(&pcdev->lock);
 433 }
 434
 435 static int sh_mobile_ceu_videobuf_init(struct vb2_buffer *vb)
 436 {
 437         /* This is for locking debugging only */
 438         INIT_LIST_HEAD(&to_ceu_vb(vb)->queue);
 439         return 0;
 440 }
 441
 442 static int sh_mobile_ceu_stop_streaming(struct vb2_queue *q)
 443 {
 444         struct soc_camera_device *icd = container_of(q, struct soc_camera_device, vb2_vidq);
 445         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 446         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 447         struct list_head *buf_head, *tmp;
 448
 449         spin_lock_irq(&pcdev->lock);
 450
 451         pcdev->active = NULL;
 452
 453         list_for_each_safe(buf_head, tmp, &pcdev->capture)
 454                 list_del_init(buf_head);
 455
 456         spin_unlock_irq(&pcdev->lock);
 457
 458         return sh_mobile_ceu_soft_reset(pcdev);
 459 }
 460
 461 static struct vb2_ops sh_mobile_ceu_videobuf_ops = {
 462         .queue_setup    = sh_mobile_ceu_videobuf_setup,
 463         .buf_prepare    = sh_mobile_ceu_videobuf_prepare,
 464         .buf_queue      = sh_mobile_ceu_videobuf_queue,
 465         .buf_cleanup    = sh_mobile_ceu_videobuf_release,
 466         .buf_init       = sh_mobile_ceu_videobuf_init,
 467         .wait_prepare   = soc_camera_unlock,
 468         .wait_finish    = soc_camera_lock,
 469         .stop_streaming = sh_mobile_ceu_stop_streaming,
 470 };
 471
 472 static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
 473 {
 474         struct sh_mobile_ceu_dev *pcdev = data;
 475         struct vb2_buffer *vb;
 476         int ret;
 477
 478         spin_lock(&pcdev->lock);
 479
 480         vb = pcdev->active;
 481         if (!vb)
 482                 /* Stale interrupt from a released buffer */
 483                 goto out;
 484
 485         list_del_init(&to_ceu_vb(vb)->queue);
 486
 487         if (!list_empty(&pcdev->capture))
 488                 pcdev->active = &list_entry(pcdev->capture.next,
 489                                             struct sh_mobile_ceu_buffer, queue)->vb;
 490         else
 491                 pcdev->active = NULL;
 492
 493         ret = sh_mobile_ceu_capture(pcdev);
 494         do_gettimeofday(&vb->v4l2_buf.timestamp);
 495         if (!ret) {
 496                 vb->v4l2_buf.field = pcdev->field;
 497                 vb->v4l2_buf.sequence = pcdev->sequence++;
 498         }
 499         vb2_buffer_done(vb, ret < 0 ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 500
 501 out:
 502         spin_unlock(&pcdev->lock);
 503
 504         return IRQ_HANDLED;
 505 }
 506
 507 static struct v4l2_subdev *find_csi2(struct sh_mobile_ceu_dev *pcdev)
 508 {
 509         struct v4l2_subdev *sd;
 510
 511         if (!pcdev->csi2_pdev)
 512                 return NULL;
 513
 514         v4l2_device_for_each_subdev(sd, &pcdev->ici.v4l2_dev)
 515                 if (&pcdev->csi2_pdev->dev == v4l2_get_subdevdata(sd))
 516                         return sd;
 517
 518         return NULL;
 519 }
 520
 521 /* Called with .video_lock held */
 522 static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
 523 {
 524         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 525         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 526         struct v4l2_subdev *csi2_sd;
 527         int ret;
 528
 529         if (pcdev->icd)
 530                 return -EBUSY;
 531
 532         dev_info(icd->parent,
 533                  "SuperH Mobile CEU driver attached to camera %d\n",
 534                  icd->devnum);
 535
 536         pm_runtime_get_sync(ici->v4l2_dev.dev);
 537
 538         ret = sh_mobile_ceu_soft_reset(pcdev);
 539
 540         csi2_sd = find_csi2(pcdev);
 541
 542         ret = v4l2_subdev_call(csi2_sd, core, s_power, 1);
 543         if (ret != -ENODEV && ret != -ENOIOCTLCMD && ret < 0) {
 544                 pm_runtime_put_sync(ici->v4l2_dev.dev);
 545         } else {
 546                 pcdev->icd = icd;
 547                 ret = 0;
 548         }
 549
 550         return ret;
 551 }
 552
 553 /* Called with .video_lock held */
 554 static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
 555 {
 556         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 557         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 558         struct v4l2_subdev *csi2_sd = find_csi2(pcdev);
 559
 560         BUG_ON(icd != pcdev->icd);
 561
 562         v4l2_subdev_call(csi2_sd, core, s_power, 0);
 563         /* disable capture, disable interrupts */
 564         ceu_write(pcdev, CEIER, 0);
 565         sh_mobile_ceu_soft_reset(pcdev);
 566
 567         /* make sure active buffer is canceled */
 568         spin_lock_irq(&pcdev->lock);
 569         if (pcdev->active) {
 570                 list_del_init(&to_ceu_vb(pcdev->active)->queue);
 571                 vb2_buffer_done(pcdev->active, VB2_BUF_STATE_ERROR);
 572                 pcdev->active = NULL;
 573         }
 574         spin_unlock_irq(&pcdev->lock);
 575
 576         pm_runtime_put_sync(ici->v4l2_dev.dev);
 577
 578         dev_info(icd->parent,
 579                  "SuperH Mobile CEU driver detached from camera %d\n",
 580                  icd->devnum);
 581
 582         pcdev->icd = NULL;
 583 }
 584
 585 /*
 586  * See chapter 29.4.12 "Capture Filter Control Register (CFLCR)"
 587  * in SH7722 Hardware Manual
 588  */
 589 static unsigned int size_dst(unsigned int src, unsigned int scale)
 590 {
 591         unsigned int mant_pre = scale >> 12;
 592         if (!src || !scale)
 593                 return src;
 594         return ((mant_pre + 2 * (src - 1)) / (2 * mant_pre) - 1) *
 595                 mant_pre * 4096 / scale + 1;
 596 }
 597
 598 static u16 calc_scale(unsigned int src, unsigned int *dst)
 599 {
 600         u16 scale;
 601
 602         if (src == *dst)
 603                 return 0;
 604
 605         scale = (src * 4096 / *dst) & ~7;
 606
 607         while (scale > 4096 && size_dst(src, scale) < *dst)
 608                 scale -= 8;
 609
 610         *dst = size_dst(src, scale);
 611
 612         return scale;
 613 }
 614
 615 /* rect is guaranteed to not exceed the scaled camera rectangle */
 616 static void sh_mobile_ceu_set_rect(struct soc_camera_device *icd)
 617 {
 618         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 619         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 620         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 621         unsigned int height, width, cdwdr_width, in_width, in_height;
 622         unsigned int left_offset, top_offset;
 623         u32 camor;
 624
 625         dev_geo(icd->parent, "Crop %ux%u@%u:%u\n",
 626                 icd->user_width, icd->user_height, cam->ceu_left, cam->ceu_top);
 627
 628         left_offset     = cam->ceu_left;
 629         top_offset      = cam->ceu_top;
 630
 631         /* CEU cropping (CFSZR) is applied _after_ the scaling filter (CFLCR) */
 632         if (pcdev->image_mode) {
 633                 in_width = cam->width;
 634                 if (!pcdev->is_16bit) {
 635                         in_width *= 2;
 636                         left_offset *= 2;
 637                 }
 638                 width = icd->user_width;
 639                 cdwdr_width = icd->user_width;
 640         } else {
 641                 int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 642                                                 icd->current_fmt->host_fmt);
 643                 unsigned int w_factor;
 644
 645                 width = icd->user_width;
 646
 647                 switch (icd->current_fmt->host_fmt->packing) {
 648                 case SOC_MBUS_PACKING_2X8_PADHI:
 649                         w_factor = 2;
 650                         break;
 651                 default:
 652                         w_factor = 1;
 653                 }
 654
 655                 in_width = cam->width * w_factor;
 656                 left_offset = left_offset * w_factor;
 657
 658                 if (bytes_per_line < 0)
 659                         cdwdr_width = icd->user_width;
 660                 else
 661                         cdwdr_width = bytes_per_line;
 662         }
 663
 664         height = icd->user_height;
 665         in_height = cam->height;
 666         if (V4L2_FIELD_NONE != pcdev->field) {
 667                 height /= 2;
 668                 in_height /= 2;
 669                 top_offset /= 2;
 670                 cdwdr_width *= 2;
 671         }
 672
 673         /* CSI2 special configuration */
 674         if (pcdev->pdata->csi2) {
 675                 in_width = ((in_width - 2) * 2);
 676                 left_offset *= 2;
 677         }
 678
 679         /* Set CAMOR, CAPWR, CFSZR, take care of CDWDR */
 680         camor = left_offset | (top_offset << 16);
 681
 682         dev_geo(icd->parent,
 683                 "CAMOR 0x%x, CAPWR 0x%x, CFSZR 0x%x, CDWDR 0x%x\n", camor,
 684                 (in_height << 16) | in_width, (height << 16) | width,
 685                 cdwdr_width);
 686
 687         ceu_write(pcdev, CAMOR, camor);
 688         ceu_write(pcdev, CAPWR, (in_height << 16) | in_width);
 689         ceu_write(pcdev, CFSZR, (height << 16) | width);
 690         ceu_write(pcdev, CDWDR, cdwdr_width);
 691 }
 692
 693 static u32 capture_save_reset(struct sh_mobile_ceu_dev *pcdev)
 694 {
 695         u32 capsr = ceu_read(pcdev, CAPSR);
 696         ceu_write(pcdev, CAPSR, 1 << 16); /* reset, stop capture */
 697         return capsr;
 698 }
 699
 700 static void capture_restore(struct sh_mobile_ceu_dev *pcdev, u32 capsr)
 701 {
 702         unsigned long timeout = jiffies + 10 * HZ;
 703
 704         /*
 705          * Wait until the end of the current frame. It can take a long time,
 706          * but if it has been aborted by a CAPSR reset, it shoule exit sooner.
 707          */
 708         while ((ceu_read(pcdev, CSTSR) & 1) && time_before(jiffies, timeout))
 709                 msleep(1);
 710
 711         if (time_after(jiffies, timeout)) {
 712                 dev_err(pcdev->ici.v4l2_dev.dev,
 713                         "Timeout waiting for frame end! Interface problem?\n");
 714                 return;
 715         }
 716
 717         /* Wait until reset clears, this shall not hang... */
 718         while (ceu_read(pcdev, CAPSR) & (1 << 16))
 719                 udelay(10);
 720
 721         /* Anything to restore? */
 722         if (capsr & ~(1 << 16))
 723                 ceu_write(pcdev, CAPSR, capsr);
 724 }
 725
 726 /* Capture is not running, no interrupts, no locking needed */
 727 static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
 728                                        __u32 pixfmt)
 729 {
 730         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 731         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 732         int ret;
 733         unsigned long camera_flags, common_flags, value;
 734         int yuv_lineskip;
 735         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 736         u32 capsr = capture_save_reset(pcdev);
 737
 738         camera_flags = icd->ops->query_bus_param(icd);
 739         common_flags = soc_camera_bus_param_compatible(camera_flags,
 740                                                        make_bus_param(pcdev));
 741         if (!common_flags)
 742                 return -EINVAL;
 743
 744         /* Make choises, based on platform preferences */
 745         if ((common_flags & SOCAM_HSYNC_ACTIVE_HIGH) &&
 746             (common_flags & SOCAM_HSYNC_ACTIVE_LOW)) {
 747                 if (pcdev->pdata->flags & SH_CEU_FLAG_HSYNC_LOW)
 748                         common_flags &= ~SOCAM_HSYNC_ACTIVE_HIGH;
 749                 else
 750                         common_flags &= ~SOCAM_HSYNC_ACTIVE_LOW;
 751         }
 752
 753         if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) &&
 754             (common_flags & SOCAM_VSYNC_ACTIVE_LOW)) {
 755                 if (pcdev->pdata->flags & SH_CEU_FLAG_VSYNC_LOW)
 756                         common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH;
 757                 else
 758                         common_flags &= ~SOCAM_VSYNC_ACTIVE_LOW;
 759         }
 760
 761         ret = icd->ops->set_bus_param(icd, common_flags);
 762         if (ret < 0)
 763                 return ret;
 764
 765         switch (common_flags & SOCAM_DATAWIDTH_MASK) {
 766         case SOCAM_DATAWIDTH_8:
 767                 pcdev->is_16bit = 0;
 768                 break;
 769         case SOCAM_DATAWIDTH_16:
 770                 pcdev->is_16bit = 1;
 771                 break;
 772         default:
 773                 return -EINVAL;
 774         }
 775
 776         ceu_write(pcdev, CRCNTR, 0);
 777         ceu_write(pcdev, CRCMPR, 0);
 778
 779         value = 0x00000010; /* data fetch by default */
 780         yuv_lineskip = 0;
 781
 782         switch (icd->current_fmt->host_fmt->fourcc) {
 783         case V4L2_PIX_FMT_NV12:
 784         case V4L2_PIX_FMT_NV21:
 785                 yuv_lineskip = 1; /* skip for NV12/21, no skip for NV16/61 */
 786                 /* fall-through */
 787         case V4L2_PIX_FMT_NV16:
 788         case V4L2_PIX_FMT_NV61:
 789                 switch (cam->code) {
 790                 case V4L2_MBUS_FMT_UYVY8_2X8:
 791                         value = 0x00000000; /* Cb0, Y0, Cr0, Y1 */
 792                         break;
 793                 case V4L2_MBUS_FMT_VYUY8_2X8:
 794                         value = 0x00000100; /* Cr0, Y0, Cb0, Y1 */
 795                         break;
 796                 case V4L2_MBUS_FMT_YUYV8_2X8:
 797                         value = 0x00000200; /* Y0, Cb0, Y1, Cr0 */
 798                         break;
 799                 case V4L2_MBUS_FMT_YVYU8_2X8:
 800                         value = 0x00000300; /* Y0, Cr0, Y1, Cb0 */
 801                         break;
 802                 default:
 803                         BUG();
 804                 }
 805         }
 806
 807         if (icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV21 ||
 808             icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV61)
 809                 value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */
 810
 811         value |= common_flags & SOCAM_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
 812         value |= common_flags & SOCAM_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
 813         value |= pcdev->is_16bit ? 1 << 12 : 0;
 814
 815         /* CSI2 mode */
 816         if (pcdev->pdata->csi2)
 817                 value |= 3 << 12;
 818
 819         ceu_write(pcdev, CAMCR, value);
 820
 821         ceu_write(pcdev, CAPCR, 0x00300000);
 822
 823         switch (pcdev->field) {
 824         case V4L2_FIELD_INTERLACED_TB:
 825                 value = 0x101;
 826                 break;
 827         case V4L2_FIELD_INTERLACED_BT:
 828                 value = 0x102;
 829                 break;
 830         default:
 831                 value = 0;
 832                 break;
 833         }
 834         ceu_write(pcdev, CAIFR, value);
 835
 836         sh_mobile_ceu_set_rect(icd);
 837         mdelay(1);
 838
 839         dev_geo(icd->parent, "CFLCR 0x%x\n", pcdev->cflcr);
 840         ceu_write(pcdev, CFLCR, pcdev->cflcr);
 841
 842         /*
 843          * A few words about byte order (observed in Big Endian mode)
 844          *
 845          * In data fetch mode bytes are received in chunks of 8 bytes.
 846          * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
 847          *
 848          * The data is however by default written to memory in reverse order:
 849          * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
 850          *
 851          * The lowest three bits of CDOCR allows us to do swapping,
 852          * using 7 we swap the data bytes to match the incoming order:
 853          * D0, D1, D2, D3, D4, D5, D6, D7
 854          */
 855         value = 0x00000017;
 856         if (yuv_lineskip)
 857                 value &= ~0x00000010; /* convert 4:2:2 -> 4:2:0 */
 858
 859         ceu_write(pcdev, CDOCR, value);
 860         ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
 861
 862         dev_dbg(icd->parent, "S_FMT successful for %c%c%c%c %ux%u\n",
 863                 pixfmt & 0xff, (pixfmt >> 8) & 0xff,
 864                 (pixfmt >> 16) & 0xff, (pixfmt >> 24) & 0xff,
 865                 icd->user_width, icd->user_height);
 866
 867         capture_restore(pcdev, capsr);
 868
 869         /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
 870         return 0;
 871 }
 872
 873 static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd,
 874                                        unsigned char buswidth)
 875 {
 876         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
 877         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 878         unsigned long camera_flags, common_flags;
 879
 880         camera_flags = icd->ops->query_bus_param(icd);
 881         common_flags = soc_camera_bus_param_compatible(camera_flags,
 882                                                        make_bus_param(pcdev));
 883         if (!common_flags || buswidth > 16 ||
 884             (buswidth > 8 && !(common_flags & SOCAM_DATAWIDTH_16)))
 885                 return -EINVAL;
 886
 887         return 0;
 888 }
 889
 890 static const struct soc_mbus_pixelfmt sh_mobile_ceu_formats[] = {
 891         {
 892                 .fourcc                 = V4L2_PIX_FMT_NV12,
 893                 .name                   = "NV12",
 894                 .bits_per_sample        = 12,
 895                 .packing                = SOC_MBUS_PACKING_NONE,
 896                 .order                  = SOC_MBUS_ORDER_LE,
 897         }, {
 898                 .fourcc                 = V4L2_PIX_FMT_NV21,
 899                 .name                   = "NV21",
 900                 .bits_per_sample        = 12,
 901                 .packing                = SOC_MBUS_PACKING_NONE,
 902                 .order                  = SOC_MBUS_ORDER_LE,
 903         }, {
 904                 .fourcc                 = V4L2_PIX_FMT_NV16,
 905                 .name                   = "NV16",
 906                 .bits_per_sample        = 16,
 907                 .packing                = SOC_MBUS_PACKING_NONE,
 908                 .order                  = SOC_MBUS_ORDER_LE,
 909         }, {
 910                 .fourcc                 = V4L2_PIX_FMT_NV61,
 911                 .name                   = "NV61",
 912                 .bits_per_sample        = 16,
 913                 .packing                = SOC_MBUS_PACKING_NONE,
 914                 .order                  = SOC_MBUS_ORDER_LE,
 915         },
 916 };
 917
 918 /* This will be corrected as we get more formats */
 919 static bool sh_mobile_ceu_packing_supported(const struct soc_mbus_pixelfmt *fmt)
 920 {
 921         return  fmt->packing == SOC_MBUS_PACKING_NONE ||
 922                 (fmt->bits_per_sample == 8 &&
 923                  fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
 924                 (fmt->bits_per_sample > 8 &&
 925                  fmt->packing == SOC_MBUS_PACKING_EXTEND16);
 926 }
 927
 928 static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect);
 929
 930 static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, unsigned int idx,
 931                                      struct soc_camera_format_xlate *xlate)
 932 {
 933         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 934         struct device *dev = icd->parent;
 935         struct soc_camera_host *ici = to_soc_camera_host(dev);
 936         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 937         int ret, k, n;
 938         int formats = 0;
 939         struct sh_mobile_ceu_cam *cam;
 940         enum v4l2_mbus_pixelcode code;
 941         const struct soc_mbus_pixelfmt *fmt;
 942
 943         ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
 944         if (ret < 0)
 945                 /* No more formats */
 946                 return 0;
 947
 948         fmt = soc_mbus_get_fmtdesc(code);
 949         if (!fmt) {
 950                 dev_warn(dev, "unsupported format code #%u: %d\n", idx, code);
 951                 return 0;
 952         }
 953
 954         if (!pcdev->pdata->csi2) {
 955                 ret = sh_mobile_ceu_try_bus_param(icd, fmt->bits_per_sample);
 956                 if (ret < 0)
 957                         return 0;
 958         }
 959
 960         if (!icd->host_priv) {
 961                 struct v4l2_mbus_framefmt mf;
 962                 struct v4l2_rect rect;
 963                 int shift = 0;
 964
 965                 /* FIXME: subwindow is lost between close / open */
 966
 967                 /* Cache current client geometry */
 968                 ret = client_g_rect(sd, &rect);
 969                 if (ret < 0)
 970                         return ret;
 971
 972                 /* First time */
 973                 ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
 974                 if (ret < 0)
 975                         return ret;
 976
 977                 while ((mf.width > 2560 || mf.height > 1920) && shift < 4) {
 978                         /* Try 2560x1920, 1280x960, 640x480, 320x240 */
 979                         mf.width        = 2560 >> shift;
 980                         mf.height       = 1920 >> shift;
 981                         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
 982                                                          s_mbus_fmt, &mf);
 983                         if (ret < 0)
 984                                 return ret;
 985                         shift++;
 986                 }
 987
 988                 if (shift == 4) {
 989                         dev_err(dev, "Failed to configure the client below %ux%x\n",
 990                                 mf.width, mf.height);
 991                         return -EIO;
 992                 }
 993
 994                 dev_geo(dev, "camera fmt %ux%u\n", mf.width, mf.height);
 995
 996                 cam = kzalloc(sizeof(*cam), GFP_KERNEL);
 997                 if (!cam)
 998                         return -ENOMEM;
 999
1000                 /* We are called with current camera crop, initialise subrect with it */
1001                 cam->rect       = rect;
1002                 cam->subrect    = rect;
1003
1004                 cam->width      = mf.width;
1005                 cam->height     = mf.height;
1006
1007                 cam->width      = mf.width;
1008                 cam->height     = mf.height;
1009
1010                 icd->host_priv = cam;
1011         } else {
1012                 cam = icd->host_priv;
1013         }
1014
1015         /* Beginning of a pass */
1016         if (!idx)
1017                 cam->extra_fmt = NULL;
1018
1019         switch (code) {
1020         case V4L2_MBUS_FMT_UYVY8_2X8:
1021         case V4L2_MBUS_FMT_VYUY8_2X8:
1022         case V4L2_MBUS_FMT_YUYV8_2X8:
1023         case V4L2_MBUS_FMT_YVYU8_2X8:
1024                 if (cam->extra_fmt)
1025                         break;
1026
1027                 /*
1028                  * Our case is simple so far: for any of the above four camera
1029                  * formats we add all our four synthesized NV* formats, so,
1030                  * just marking the device with a single flag suffices. If
1031                  * the format generation rules are more complex, you would have
1032                  * to actually hang your already added / counted formats onto
1033                  * the host_priv pointer and check whether the format you're
1034                  * going to add now is already there.
1035                  */
1036                 cam->extra_fmt = sh_mobile_ceu_formats;
1037
1038                 n = ARRAY_SIZE(sh_mobile_ceu_formats);
1039                 formats += n;
1040                 for (k = 0; xlate && k < n; k++) {
1041                         xlate->host_fmt = &sh_mobile_ceu_formats[k];
1042                         xlate->code     = code;
1043                         xlate++;
1044                         dev_dbg(dev, "Providing format %s using code %d\n",
1045                                 sh_mobile_ceu_formats[k].name, code);
1046                 }
1047                 break;
1048         default:
1049                 if (!sh_mobile_ceu_packing_supported(fmt))
1050                         return 0;
1051         }
1052
1053         /* Generic pass-through */
1054         formats++;
1055         if (xlate) {
1056                 xlate->host_fmt = fmt;
1057                 xlate->code     = code;
1058                 xlate++;
1059                 dev_dbg(dev, "Providing format %s in pass-through mode\n",
1060                         fmt->name);
1061         }
1062
1063         return formats;
1064 }
1065
1066 static void sh_mobile_ceu_put_formats(struct soc_camera_device *icd)
1067 {
1068         kfree(icd->host_priv);
1069         icd->host_priv = NULL;
1070 }
1071
1072 /* Check if any dimension of r1 is smaller than respective one of r2 */
1073 static bool is_smaller(struct v4l2_rect *r1, struct v4l2_rect *r2)
1074 {
1075         return r1->width < r2->width || r1->height < r2->height;
1076 }
1077
1078 /* Check if r1 fails to cover r2 */
1079 static bool is_inside(struct v4l2_rect *r1, struct v4l2_rect *r2)
1080 {
1081         return r1->left > r2->left || r1->top > r2->top ||
1082                 r1->left + r1->width < r2->left + r2->width ||
1083                 r1->top + r1->height < r2->top + r2->height;
1084 }
1085
1086 static unsigned int scale_down(unsigned int size, unsigned int scale)
1087 {
1088         return (size * 4096 + scale / 2) / scale;
1089 }
1090
1091 static unsigned int calc_generic_scale(unsigned int input, unsigned int output)
1092 {
1093         return (input * 4096 + output / 2) / output;
1094 }
1095
1096 /* Get and store current client crop */
1097 static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect)
1098 {
1099         struct v4l2_crop crop;
1100         struct v4l2_cropcap cap;
1101         int ret;
1102
1103         crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1104
1105         ret = v4l2_subdev_call(sd, video, g_crop, &crop);
1106         if (!ret) {
1107                 *rect = crop.c;
1108                 return ret;
1109         }
1110
1111         /* Camera driver doesn't support .g_crop(), assume default rectangle */
1112         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1113
1114         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1115         if (!ret)
1116                 *rect = cap.defrect;
1117
1118         return ret;
1119 }
1120
1121 /* Client crop has changed, update our sub-rectangle to remain within the area */
1122 static void update_subrect(struct sh_mobile_ceu_cam *cam)
1123 {
1124         struct v4l2_rect *rect = &cam->rect, *subrect = &cam->subrect;
1125
1126         if (rect->width < subrect->width)
1127                 subrect->width = rect->width;
1128
1129         if (rect->height < subrect->height)
1130                 subrect->height = rect->height;
1131
1132         if (rect->left > subrect->left)
1133                 subrect->left = rect->left;
1134         else if (rect->left + rect->width >
1135                  subrect->left + subrect->width)
1136                 subrect->left = rect->left + rect->width -
1137                         subrect->width;
1138
1139         if (rect->top > subrect->top)
1140                 subrect->top = rect->top;
1141         else if (rect->top + rect->height >
1142                  subrect->top + subrect->height)
1143                 subrect->top = rect->top + rect->height -
1144                         subrect->height;
1145 }
1146
1147 /*
1148  * The common for both scaling and cropping iterative approach is:
1149  * 1. try if the client can produce exactly what requested by the user
1150  * 2. if (1) failed, try to double the client image until we get one big enough
1151  * 3. if (2) failed, try to request the maximum image
1152  */
1153 static int client_s_crop(struct soc_camera_device *icd, struct v4l2_crop *crop,
1154                          struct v4l2_crop *cam_crop)
1155 {
1156         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1157         struct v4l2_rect *rect = &crop->c, *cam_rect = &cam_crop->c;
1158         struct device *dev = sd->v4l2_dev->dev;
1159         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1160         struct v4l2_cropcap cap;
1161         int ret;
1162         unsigned int width, height;
1163
1164         v4l2_subdev_call(sd, video, s_crop, crop);
1165         ret = client_g_rect(sd, cam_rect);
1166         if (ret < 0)
1167                 return ret;
1168
1169         /*
1170          * Now cam_crop contains the current camera input rectangle, and it must
1171          * be within camera cropcap bounds
1172          */
1173         if (!memcmp(rect, cam_rect, sizeof(*rect))) {
1174                 /* Even if camera S_CROP failed, but camera rectangle matches */
1175                 dev_dbg(dev, "Camera S_CROP successful for %dx%d@%d:%d\n",
1176                         rect->width, rect->height, rect->left, rect->top);
1177                 cam->rect = *cam_rect;
1178                 return 0;
1179         }
1180
1181         /* Try to fix cropping, that camera hasn't managed to set */
1182         dev_geo(dev, "Fix camera S_CROP for %dx%d@%d:%d to %dx%d@%d:%d\n",
1183                 cam_rect->width, cam_rect->height,
1184                 cam_rect->left, cam_rect->top,
1185                 rect->width, rect->height, rect->left, rect->top);
1186
1187         /* We need sensor maximum rectangle */
1188         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1189         if (ret < 0)
1190                 return ret;
1191
1192         /* Put user requested rectangle within sensor bounds */
1193         soc_camera_limit_side(&rect->left, &rect->width, cap.bounds.left, 2,
1194                               cap.bounds.width);
1195         soc_camera_limit_side(&rect->top, &rect->height, cap.bounds.top, 4,
1196                               cap.bounds.height);
1197
1198         /*
1199          * Popular special case - some cameras can only handle fixed sizes like
1200          * QVGA, VGA,... Take care to avoid infinite loop.
1201          */
1202         width = max(cam_rect->width, 2);
1203         height = max(cam_rect->height, 2);
1204
1205         /*
1206          * Loop as long as sensor is not covering the requested rectangle and
1207          * is still within its bounds
1208          */
1209         while (!ret && (is_smaller(cam_rect, rect) ||
1210                         is_inside(cam_rect, rect)) &&
1211                (cap.bounds.width > width || cap.bounds.height > height)) {
1212
1213                 width *= 2;
1214                 height *= 2;
1215
1216                 cam_rect->width = width;
1217                 cam_rect->height = height;
1218
1219                 /*
1220                  * We do not know what capabilities the camera has to set up
1221                  * left and top borders. We could try to be smarter in iterating
1222                  * them, e.g., if camera current left is to the right of the
1223                  * target left, set it to the middle point between the current
1224                  * left and minimum left. But that would add too much
1225                  * complexity: we would have to iterate each border separately.
1226                  * Instead we just drop to the left and top bounds.
1227                  */
1228                 if (cam_rect->left > rect->left)
1229                         cam_rect->left = cap.bounds.left;
1230
1231                 if (cam_rect->left + cam_rect->width < rect->left + rect->width)
1232                         cam_rect->width = rect->left + rect->width -
1233                                 cam_rect->left;
1234
1235                 if (cam_rect->top > rect->top)
1236                         cam_rect->top = cap.bounds.top;
1237
1238                 if (cam_rect->top + cam_rect->height < rect->top + rect->height)
1239                         cam_rect->height = rect->top + rect->height -
1240                                 cam_rect->top;
1241
1242                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1243                 ret = client_g_rect(sd, cam_rect);
1244                 dev_geo(dev, "Camera S_CROP %d for %dx%d@%d:%d\n", ret,
1245                         cam_rect->width, cam_rect->height,
1246                         cam_rect->left, cam_rect->top);
1247         }
1248
1249         /* S_CROP must not modify the rectangle */
1250         if (is_smaller(cam_rect, rect) || is_inside(cam_rect, rect)) {
1251                 /*
1252                  * The camera failed to configure a suitable cropping,
1253                  * we cannot use the current rectangle, set to max
1254                  */
1255                 *cam_rect = cap.bounds;
1256                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
1257                 ret = client_g_rect(sd, cam_rect);
1258                 dev_geo(dev, "Camera S_CROP %d for max %dx%d@%d:%d\n", ret,
1259                         cam_rect->width, cam_rect->height,
1260                         cam_rect->left, cam_rect->top);
1261         }
1262
1263         if (!ret) {
1264                 cam->rect = *cam_rect;
1265                 update_subrect(cam);
1266         }
1267
1268         return ret;
1269 }
1270
1271 /* Iterative s_mbus_fmt, also updates cached client crop on success */
1272 static int client_s_fmt(struct soc_camera_device *icd,
1273                         struct v4l2_mbus_framefmt *mf, bool ceu_can_scale)
1274 {
1275         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1276         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1277         struct device *dev = icd->parent;
1278         unsigned int width = mf->width, height = mf->height, tmp_w, tmp_h;
1279         unsigned int max_width, max_height;
1280         struct v4l2_cropcap cap;
1281         int ret;
1282
1283         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
1284                                          s_mbus_fmt, mf);
1285         if (ret < 0)
1286                 return ret;
1287
1288         dev_geo(dev, "camera scaled to %ux%u\n", mf->width, mf->height);
1289
1290         if ((width == mf->width && height == mf->height) || !ceu_can_scale)
1291                 goto update_cache;
1292
1293         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1294
1295         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1296         if (ret < 0)
1297                 return ret;
1298
1299         max_width = min(cap.bounds.width, 2560);
1300         max_height = min(cap.bounds.height, 1920);
1301
1302         /* Camera set a format, but geometry is not precise, try to improve */
1303         tmp_w = mf->width;
1304         tmp_h = mf->height;
1305
1306         /* width <= max_width && height <= max_height - guaranteed by try_fmt */
1307         while ((width > tmp_w || height > tmp_h) &&
1308                tmp_w < max_width && tmp_h < max_height) {
1309                 tmp_w = min(2 * tmp_w, max_width);
1310                 tmp_h = min(2 * tmp_h, max_height);
1311                 mf->width = tmp_w;
1312                 mf->height = tmp_h;
1313                 ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
1314                                                  s_mbus_fmt, mf);
1315                 dev_geo(dev, "Camera scaled to %ux%u\n",
1316                         mf->width, mf->height);
1317                 if (ret < 0) {
1318                         /* This shouldn't happen */
1319                         dev_err(dev, "Client failed to set format: %d\n", ret);
1320                         return ret;
1321                 }
1322         }
1323
1324 update_cache:
1325         /* Update cache */
1326         ret = client_g_rect(sd, &cam->rect);
1327         if (ret < 0)
1328                 return ret;
1329
1330         update_subrect(cam);
1331
1332         return 0;
1333 }
1334
1335 /**
1336  * @width       - on output: user width, mapped back to input
1337  * @height      - on output: user height, mapped back to input
1338  * @mf          - in- / output camera output window
1339  */
1340 static int client_scale(struct soc_camera_device *icd,
1341                         struct v4l2_mbus_framefmt *mf,
1342                         unsigned int *width, unsigned int *height,
1343                         bool ceu_can_scale)
1344 {
1345         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1346         struct device *dev = icd->parent;
1347         struct v4l2_mbus_framefmt mf_tmp = *mf;
1348         unsigned int scale_h, scale_v;
1349         int ret;
1350
1351         /*
1352          * 5. Apply iterative camera S_FMT for camera user window (also updates
1353          *    client crop cache and the imaginary sub-rectangle).
1354          */
1355         ret = client_s_fmt(icd, &mf_tmp, ceu_can_scale);
1356         if (ret < 0)
1357                 return ret;
1358
1359         dev_geo(dev, "5: camera scaled to %ux%u\n",
1360                 mf_tmp.width, mf_tmp.height);
1361
1362         /* 6. Retrieve camera output window (g_fmt) */
1363
1364         /* unneeded - it is already in "mf_tmp" */
1365
1366         /* 7. Calculate new client scales. */
1367         scale_h = calc_generic_scale(cam->rect.width, mf_tmp.width);
1368         scale_v = calc_generic_scale(cam->rect.height, mf_tmp.height);
1369
1370         mf->width       = mf_tmp.width;
1371         mf->height      = mf_tmp.height;
1372         mf->colorspace  = mf_tmp.colorspace;
1373
1374         /*
1375          * 8. Calculate new CEU crop - apply camera scales to previously
1376          *    updated "effective" crop.
1377          */
1378         *width = scale_down(cam->subrect.width, scale_h);
1379         *height = scale_down(cam->subrect.height, scale_v);
1380
1381         dev_geo(dev, "8: new client sub-window %ux%u\n", *width, *height);
1382
1383         return 0;
1384 }
1385
1386 /*
1387  * CEU can scale and crop, but we don't want to waste bandwidth and kill the
1388  * framerate by always requesting the maximum image from the client. See
1389  * Documentation/video4linux/sh_mobile_ceu_camera.txt for a description of
1390  * scaling and cropping algorithms and for the meaning of referenced here steps.
1391  */
1392 static int sh_mobile_ceu_set_crop(struct soc_camera_device *icd,
1393                                   struct v4l2_crop *a)
1394 {
1395         struct v4l2_rect *rect = &a->c;
1396         struct device *dev = icd->parent;
1397         struct soc_camera_host *ici = to_soc_camera_host(dev);
1398         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1399         struct v4l2_crop cam_crop;
1400         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1401         struct v4l2_rect *cam_rect = &cam_crop.c;
1402         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1403         struct v4l2_mbus_framefmt mf;
1404         unsigned int scale_cam_h, scale_cam_v, scale_ceu_h, scale_ceu_v,
1405                 out_width, out_height;
1406         int interm_width, interm_height;
1407         u32 capsr, cflcr;
1408         int ret;
1409
1410         dev_geo(dev, "S_CROP(%ux%u@%u:%u)\n", rect->width, rect->height,
1411                 rect->left, rect->top);
1412
1413         /* During camera cropping its output window can change too, stop CEU */
1414         capsr = capture_save_reset(pcdev);
1415         dev_dbg(dev, "CAPSR 0x%x, CFLCR 0x%x\n", capsr, pcdev->cflcr);
1416
1417         /* 1. - 2. Apply iterative camera S_CROP for new input window. */
1418         ret = client_s_crop(icd, a, &cam_crop);
1419         if (ret < 0)
1420                 return ret;
1421
1422         dev_geo(dev, "1-2: camera cropped to %ux%u@%u:%u\n",
1423                 cam_rect->width, cam_rect->height,
1424                 cam_rect->left, cam_rect->top);
1425
1426         /* On success cam_crop contains current camera crop */
1427
1428         /* 3. Retrieve camera output window */
1429         ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
1430         if (ret < 0)
1431                 return ret;
1432
1433         if (mf.width > 2560 || mf.height > 1920)
1434                 return -EINVAL;
1435
1436         /* 4. Calculate camera scales */
1437         scale_cam_h     = calc_generic_scale(cam_rect->width, mf.width);
1438         scale_cam_v     = calc_generic_scale(cam_rect->height, mf.height);
1439
1440         /* Calculate intermediate window */
1441         interm_width    = scale_down(rect->width, scale_cam_h);
1442         interm_height   = scale_down(rect->height, scale_cam_v);
1443
1444         if (interm_width < icd->user_width) {
1445                 u32 new_scale_h;
1446
1447                 new_scale_h = calc_generic_scale(rect->width, icd->user_width);
1448
1449                 mf.width = scale_down(cam_rect->width, new_scale_h);
1450         }
1451
1452         if (interm_height < icd->user_height) {
1453                 u32 new_scale_v;
1454
1455                 new_scale_v = calc_generic_scale(rect->height, icd->user_height);
1456
1457                 mf.height = scale_down(cam_rect->height, new_scale_v);
1458         }
1459
1460         if (interm_width < icd->user_width || interm_height < icd->user_height) {
1461                 ret = v4l2_device_call_until_err(sd->v4l2_dev, (int)icd, video,
1462                                                  s_mbus_fmt, &mf);
1463                 if (ret < 0)
1464                         return ret;
1465
1466                 dev_geo(dev, "New camera output %ux%u\n", mf.width, mf.height);
1467                 scale_cam_h     = calc_generic_scale(cam_rect->width, mf.width);
1468                 scale_cam_v     = calc_generic_scale(cam_rect->height, mf.height);
1469                 interm_width    = scale_down(rect->width, scale_cam_h);
1470                 interm_height   = scale_down(rect->height, scale_cam_v);
1471         }
1472
1473         /* Cache camera output window */
1474         cam->width      = mf.width;
1475         cam->height     = mf.height;
1476
1477         if (pcdev->image_mode) {
1478                 out_width       = min(interm_width, icd->user_width);
1479                 out_height      = min(interm_height, icd->user_height);
1480         } else {
1481                 out_width       = interm_width;
1482                 out_height      = interm_height;
1483         }
1484
1485         /*
1486          * 5. Calculate CEU scales from camera scales from results of (5) and
1487          *    the user window
1488          */
1489         scale_ceu_h     = calc_scale(interm_width, &out_width);
1490         scale_ceu_v     = calc_scale(interm_height, &out_height);
1491
1492         dev_geo(dev, "5: CEU scales %u:%u\n", scale_ceu_h, scale_ceu_v);
1493
1494         /* Apply CEU scales. */
1495         cflcr = scale_ceu_h | (scale_ceu_v << 16);
1496         if (cflcr != pcdev->cflcr) {
1497                 pcdev->cflcr = cflcr;
1498                 ceu_write(pcdev, CFLCR, cflcr);
1499         }
1500
1501         icd->user_width  = out_width;
1502         icd->user_height = out_height;
1503         cam->ceu_left    = scale_down(rect->left - cam_rect->left, scale_cam_h) & ~1;
1504         cam->ceu_top     = scale_down(rect->top - cam_rect->top, scale_cam_v) & ~1;
1505
1506         /* 6. Use CEU cropping to crop to the new window. */
1507         sh_mobile_ceu_set_rect(icd);
1508
1509         cam->subrect = *rect;
1510
1511         dev_geo(dev, "6: CEU cropped to %ux%u@%u:%u\n",
1512                 icd->user_width, icd->user_height,
1513                 cam->ceu_left, cam->ceu_top);
1514
1515         /* Restore capture. The CE bit can be cleared by the hardware */
1516         if (pcdev->active)
1517                 capsr |= 1;
1518         capture_restore(pcdev, capsr);
1519
1520         /* Even if only camera cropping succeeded */
1521         return ret;
1522 }
1523
1524 static int sh_mobile_ceu_get_crop(struct soc_camera_device *icd,
1525                                   struct v4l2_crop *a)
1526 {
1527         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1528
1529         a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1530         a->c = cam->subrect;
1531
1532         return 0;
1533 }
1534
1535 /*
1536  * Calculate real client output window by applying new scales to the current
1537  * client crop. New scales are calculated from the requested output format and
1538  * CEU crop, mapped backed onto the client input (subrect).
1539  */
1540 static void calculate_client_output(struct soc_camera_device *icd,
1541                 struct v4l2_pix_format *pix, struct v4l2_mbus_framefmt *mf)
1542 {
1543         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1544         struct device *dev = icd->parent;
1545         struct v4l2_rect *cam_subrect = &cam->subrect;
1546         unsigned int scale_v, scale_h;
1547
1548         if (cam_subrect->width == cam->rect.width &&
1549             cam_subrect->height == cam->rect.height) {
1550                 /* No sub-cropping */
1551                 mf->width       = pix->width;
1552                 mf->height      = pix->height;
1553                 return;
1554         }
1555
1556         /* 1.-2. Current camera scales and subwin - cached. */
1557
1558         dev_geo(dev, "2: subwin %ux%u@%u:%u\n",
1559                 cam_subrect->width, cam_subrect->height,
1560                 cam_subrect->left, cam_subrect->top);
1561
1562         /*
1563          * 3. Calculate new combined scales from input sub-window to requested
1564          *    user window.
1565          */
1566
1567         /*
1568          * TODO: CEU cannot scale images larger than VGA to smaller than SubQCIF
1569          * (128x96) or larger than VGA
1570          */
1571         scale_h = calc_generic_scale(cam_subrect->width, pix->width);
1572         scale_v = calc_generic_scale(cam_subrect->height, pix->height);
1573
1574         dev_geo(dev, "3: scales %u:%u\n", scale_h, scale_v);
1575
1576         /*
1577          * 4. Calculate client output window by applying combined scales to real
1578          *    input window.
1579          */
1580         mf->width       = scale_down(cam->rect.width, scale_h);
1581         mf->height      = scale_down(cam->rect.height, scale_v);
1582 }
1583
1584 /* Similar to set_crop multistage iterative algorithm */
1585 static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
1586                                  struct v4l2_format *f)
1587 {
1588         struct device *dev = icd->parent;
1589         struct soc_camera_host *ici = to_soc_camera_host(dev);
1590         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1591         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1592         struct v4l2_pix_format *pix = &f->fmt.pix;
1593         struct v4l2_mbus_framefmt mf;
1594         __u32 pixfmt = pix->pixelformat;
1595         const struct soc_camera_format_xlate *xlate;
1596         /* Keep Compiler Happy */
1597         unsigned int ceu_sub_width = 0, ceu_sub_height = 0;
1598         u16 scale_v, scale_h;
1599         int ret;
1600         bool image_mode;
1601         enum v4l2_field field;
1602
1603         dev_geo(dev, "S_FMT(pix=0x%x, %ux%u)\n", pixfmt, pix->width, pix->height);
1604
1605         switch (pix->field) {
1606         default:
1607                 pix->field = V4L2_FIELD_NONE;
1608                 /* fall-through */
1609         case V4L2_FIELD_INTERLACED_TB:
1610         case V4L2_FIELD_INTERLACED_BT:
1611         case V4L2_FIELD_NONE:
1612                 field = pix->field;
1613                 break;
1614         case V4L2_FIELD_INTERLACED:
1615                 field = V4L2_FIELD_INTERLACED_TB;
1616                 break;
1617         }
1618
1619         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1620         if (!xlate) {
1621                 dev_warn(dev, "Format %x not found\n", pixfmt);
1622                 return -EINVAL;
1623         }
1624
1625         /* 1.-4. Calculate client output geometry */
1626         calculate_client_output(icd, &f->fmt.pix, &mf);
1627         mf.field        = pix->field;
1628         mf.colorspace   = pix->colorspace;
1629         mf.code         = xlate->code;
1630
1631         switch (pixfmt) {
1632         case V4L2_PIX_FMT_NV12:
1633         case V4L2_PIX_FMT_NV21:
1634         case V4L2_PIX_FMT_NV16:
1635         case V4L2_PIX_FMT_NV61:
1636                 image_mode = true;
1637                 break;
1638         default:
1639                 image_mode = false;
1640         }
1641
1642         dev_geo(dev, "4: request camera output %ux%u\n", mf.width, mf.height);
1643
1644         /* 5. - 9. */
1645         ret = client_scale(icd, &mf, &ceu_sub_width, &ceu_sub_height,
1646                            image_mode && V4L2_FIELD_NONE == field);
1647
1648         dev_geo(dev, "5-9: client scale return %d\n", ret);
1649
1650         /* Done with the camera. Now see if we can improve the result */
1651
1652         dev_geo(dev, "fmt %ux%u, requested %ux%u\n",
1653                 mf.width, mf.height, pix->width, pix->height);
1654         if (ret < 0)
1655                 return ret;
1656
1657         if (mf.code != xlate->code)
1658                 return -EINVAL;
1659
1660         /* 9. Prepare CEU crop */
1661         cam->width = mf.width;
1662         cam->height = mf.height;
1663
1664         /* 10. Use CEU scaling to scale to the requested user window. */
1665
1666         /* We cannot scale up */
1667         if (pix->width > ceu_sub_width)
1668                 ceu_sub_width = pix->width;
1669
1670         if (pix->height > ceu_sub_height)
1671                 ceu_sub_height = pix->height;
1672
1673         pix->colorspace = mf.colorspace;
1674
1675         if (image_mode) {
1676                 /* Scale pix->{width x height} down to width x height */
1677                 scale_h         = calc_scale(ceu_sub_width, &pix->width);
1678                 scale_v         = calc_scale(ceu_sub_height, &pix->height);
1679         } else {
1680                 pix->width      = ceu_sub_width;
1681                 pix->height     = ceu_sub_height;
1682                 scale_h         = 0;
1683                 scale_v         = 0;
1684         }
1685
1686         pcdev->cflcr = scale_h | (scale_v << 16);
1687
1688         /*
1689          * We have calculated CFLCR, the actual configuration will be performed
1690          * in sh_mobile_ceu_set_bus_param()
1691          */
1692
1693         dev_geo(dev, "10: W: %u : 0x%x = %u, H: %u : 0x%x = %u\n",
1694                 ceu_sub_width, scale_h, pix->width,
1695                 ceu_sub_height, scale_v, pix->height);
1696
1697         cam->code               = xlate->code;
1698         icd->current_fmt        = xlate;
1699
1700         pcdev->field = field;
1701         pcdev->image_mode = image_mode;
1702
1703         return 0;
1704 }
1705
1706 static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
1707                                  struct v4l2_format *f)
1708 {
1709         const struct soc_camera_format_xlate *xlate;
1710         struct v4l2_pix_format *pix = &f->fmt.pix;
1711         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1712         struct v4l2_mbus_framefmt mf;
1713         __u32 pixfmt = pix->pixelformat;
1714         int width, height;
1715         int ret;
1716
1717         dev_geo(icd->parent, "TRY_FMT(pix=0x%x, %ux%u)\n",
1718                  pixfmt, pix->width, pix->height);
1719
1720         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1721         if (!xlate) {
1722                 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
1723                 return -EINVAL;
1724         }
1725
1726         /* FIXME: calculate using depth and bus width */
1727
1728         v4l_bound_align_image(&pix->width, 2, 2560, 1,
1729                               &pix->height, 4, 1920, 2, 0);
1730
1731         width = pix->width;
1732         height = pix->height;
1733
1734         /* limit to sensor capabilities */
1735         mf.width        = pix->width;
1736         mf.height       = pix->height;
1737         mf.field        = pix->field;
1738         mf.code         = xlate->code;
1739         mf.colorspace   = pix->colorspace;
1740
1741         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video, try_mbus_fmt, &mf);
1742         if (ret < 0)
1743                 return ret;
1744
1745         pix->width      = mf.width;
1746         pix->height     = mf.height;
1747         pix->field      = mf.field;
1748         pix->colorspace = mf.colorspace;
1749
1750         switch (pixfmt) {
1751         case V4L2_PIX_FMT_NV12:
1752         case V4L2_PIX_FMT_NV21:
1753         case V4L2_PIX_FMT_NV16:
1754         case V4L2_PIX_FMT_NV61:
1755                 /* FIXME: check against rect_max after converting soc-camera */
1756                 /* We can scale precisely, need a bigger image from camera */
1757                 if (pix->width < width || pix->height < height) {
1758                         /*
1759                          * We presume, the sensor behaves sanely, i.e., if
1760                          * requested a bigger rectangle, it will not return a
1761                          * smaller one.
1762                          */
1763                         mf.width = 2560;
1764                         mf.height = 1920;
1765                         ret = v4l2_device_call_until_err(sd->v4l2_dev, (long)icd, video,
1766                                                          try_mbus_fmt, &mf);
1767                         if (ret < 0) {
1768                                 /* Shouldn't actually happen... */
1769                                 dev_err(icd->parent,
1770                                         "FIXME: client try_fmt() = %d\n", ret);
1771                                 return ret;
1772                         }
1773                 }
1774                 /* We will scale exactly */
1775                 if (mf.width > width)
1776                         pix->width = width;
1777                 if (mf.height > height)
1778                         pix->height = height;
1779         }
1780
1781         dev_geo(icd->parent, "%s(): return %d, fmt 0x%x, %ux%u\n",
1782                 __func__, ret, pix->pixelformat, pix->width, pix->height);
1783
1784         return ret;
1785 }
1786
1787 static int sh_mobile_ceu_set_livecrop(struct soc_camera_device *icd,
1788                                       struct v4l2_crop *a)
1789 {
1790         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1791         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1792         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1793         u32 out_width = icd->user_width, out_height = icd->user_height;
1794         int ret;
1795
1796         /* Freeze queue */
1797         pcdev->frozen = 1;
1798         /* Wait for frame */
1799         ret = wait_for_completion_interruptible(&pcdev->complete);
1800         /* Stop the client */
1801         ret = v4l2_subdev_call(sd, video, s_stream, 0);
1802         if (ret < 0)
1803                 dev_warn(icd->parent,
1804                          "Client failed to stop the stream: %d\n", ret);
1805         else
1806                 /* Do the crop, if it fails, there's nothing more we can do */
1807                 sh_mobile_ceu_set_crop(icd, a);
1808
1809         dev_geo(icd->parent, "Output after crop: %ux%u\n", icd->user_width, icd->user_height);
1810
1811         if (icd->user_width != out_width || icd->user_height != out_height) {
1812                 struct v4l2_format f = {
1813                         .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
1814                         .fmt.pix        = {
1815                                 .width          = out_width,
1816                                 .height         = out_height,
1817                                 .pixelformat    = icd->current_fmt->host_fmt->fourcc,
1818                                 .field          = pcdev->field,
1819                                 .colorspace     = icd->colorspace,
1820                         },
1821                 };
1822                 ret = sh_mobile_ceu_set_fmt(icd, &f);
1823                 if (!ret && (out_width != f.fmt.pix.width ||
1824                              out_height != f.fmt.pix.height))
1825                         ret = -EINVAL;
1826                 if (!ret) {
1827                         icd->user_width         = out_width;
1828                         icd->user_height        = out_height;
1829                         ret = sh_mobile_ceu_set_bus_param(icd,
1830                                         icd->current_fmt->host_fmt->fourcc);
1831                 }
1832         }
1833
1834         /* Thaw the queue */
1835         pcdev->frozen = 0;
1836         spin_lock_irq(&pcdev->lock);
1837         sh_mobile_ceu_capture(pcdev);
1838         spin_unlock_irq(&pcdev->lock);
1839         /* Start the client */
1840         ret = v4l2_subdev_call(sd, video, s_stream, 1);
1841         return ret;
1842 }
1843
1844 static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
1845 {
1846         struct soc_camera_device *icd = file->private_data;
1847
1848         return vb2_poll(&icd->vb2_vidq, file, pt);
1849 }
1850
1851 static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
1852                                   struct v4l2_capability *cap)
1853 {
1854         strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
1855         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1856         return 0;
1857 }
1858
1859 static int sh_mobile_ceu_init_videobuf(struct vb2_queue *q,
1860                                        struct soc_camera_device *icd)
1861 {
1862         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1863         q->io_modes = VB2_MMAP | VB2_USERPTR;
1864         q->drv_priv = icd;
1865         q->ops = &sh_mobile_ceu_videobuf_ops;
1866         q->mem_ops = &vb2_dma_contig_memops;
1867         q->buf_struct_size = sizeof(struct sh_mobile_ceu_buffer);
1868
1869         return vb2_queue_init(q);
1870 }
1871
1872 static int sh_mobile_ceu_get_ctrl(struct soc_camera_device *icd,
1873                                   struct v4l2_control *ctrl)
1874 {
1875         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1876         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1877         u32 val;
1878
1879         switch (ctrl->id) {
1880         case V4L2_CID_SHARPNESS:
1881                 val = ceu_read(pcdev, CLFCR);
1882                 ctrl->value = val ^ 1;
1883                 return 0;
1884         }
1885         return -ENOIOCTLCMD;
1886 }
1887
1888 static int sh_mobile_ceu_set_ctrl(struct soc_camera_device *icd,
1889                                   struct v4l2_control *ctrl)
1890 {
1891         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1892         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1893
1894         switch (ctrl->id) {
1895         case V4L2_CID_SHARPNESS:
1896                 switch (icd->current_fmt->host_fmt->fourcc) {
1897                 case V4L2_PIX_FMT_NV12:
1898                 case V4L2_PIX_FMT_NV21:
1899                 case V4L2_PIX_FMT_NV16:
1900                 case V4L2_PIX_FMT_NV61:
1901                         ceu_write(pcdev, CLFCR, !ctrl->value);
1902                         return 0;
1903                 }
1904                 return -EINVAL;
1905         }
1906         return -ENOIOCTLCMD;
1907 }
1908
1909 static const struct v4l2_queryctrl sh_mobile_ceu_controls[] = {
1910         {
1911                 .id             = V4L2_CID_SHARPNESS,
1912                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
1913                 .name           = "Low-pass filter",
1914                 .minimum        = 0,
1915                 .maximum        = 1,
1916                 .step           = 1,
1917                 .default_value  = 0,
1918         },
1919 };
1920
1921 static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
1922         .owner          = THIS_MODULE,
1923         .add            = sh_mobile_ceu_add_device,
1924         .remove         = sh_mobile_ceu_remove_device,
1925         .get_formats    = sh_mobile_ceu_get_formats,
1926         .put_formats    = sh_mobile_ceu_put_formats,
1927         .get_crop       = sh_mobile_ceu_get_crop,
1928         .set_crop       = sh_mobile_ceu_set_crop,
1929         .set_livecrop   = sh_mobile_ceu_set_livecrop,
1930         .set_fmt        = sh_mobile_ceu_set_fmt,
1931         .try_fmt        = sh_mobile_ceu_try_fmt,
1932         .set_ctrl       = sh_mobile_ceu_set_ctrl,
1933         .get_ctrl       = sh_mobile_ceu_get_ctrl,
1934         .poll           = sh_mobile_ceu_poll,
1935         .querycap       = sh_mobile_ceu_querycap,
1936         .set_bus_param  = sh_mobile_ceu_set_bus_param,
1937         .init_videobuf2 = sh_mobile_ceu_init_videobuf,
1938         .controls       = sh_mobile_ceu_controls,
1939         .num_controls   = ARRAY_SIZE(sh_mobile_ceu_controls),
1940 };
1941
1942 struct bus_wait {
1943         struct notifier_block   notifier;
1944         struct completion       completion;
1945         struct device           *dev;
1946 };
1947
1948 static int bus_notify(struct notifier_block *nb,
1949                       unsigned long action, void *data)
1950 {
1951         struct device *dev = data;
1952         struct bus_wait *wait = container_of(nb, struct bus_wait, notifier);
1953
1954         if (wait->dev != dev)
1955                 return NOTIFY_DONE;
1956
1957         switch (action) {
1958         case BUS_NOTIFY_UNBOUND_DRIVER:
1959                 /* Protect from module unloading */
1960                 wait_for_completion(&wait->completion);
1961                 return NOTIFY_OK;
1962         }
1963         return NOTIFY_DONE;
1964 }
1965
1966 static int __devinit sh_mobile_ceu_probe(struct platform_device *pdev)
1967 {
1968         struct sh_mobile_ceu_dev *pcdev;
1969         struct resource *res;
1970         void __iomem *base;
1971         unsigned int irq;
1972         int err = 0;
1973         struct bus_wait wait = {
1974                 .completion = COMPLETION_INITIALIZER_ONSTACK(wait.completion),
1975                 .notifier.notifier_call = bus_notify,
1976         };
1977         struct sh_mobile_ceu_companion *csi2;
1978
1979         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1980         irq = platform_get_irq(pdev, 0);
1981         if (!res || (int)irq <= 0) {
1982                 dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
1983                 err = -ENODEV;
1984                 goto exit;
1985         }
1986
1987         pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
1988         if (!pcdev) {
1989                 dev_err(&pdev->dev, "Could not allocate pcdev\n");
1990                 err = -ENOMEM;
1991                 goto exit;
1992         }
1993
1994         INIT_LIST_HEAD(&pcdev->capture);
1995         spin_lock_init(&pcdev->lock);
1996         init_completion(&pcdev->complete);
1997
1998         pcdev->pdata = pdev->dev.platform_data;
1999         if (!pcdev->pdata) {
2000                 err = -EINVAL;
2001                 dev_err(&pdev->dev, "CEU platform data not set.\n");
2002                 goto exit_kfree;
2003         }
2004
2005         base = ioremap_nocache(res->start, resource_size(res));
2006         if (!base) {
2007                 err = -ENXIO;
2008                 dev_err(&pdev->dev, "Unable to ioremap CEU registers.\n");
2009                 goto exit_kfree;
2010         }
2011
2012         pcdev->irq = irq;
2013         pcdev->base = base;
2014         pcdev->video_limit = 0; /* only enabled if second resource exists */
2015
2016         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
2017         if (res) {
2018                 err = dma_declare_coherent_memory(&pdev->dev, res->start,
2019                                                   res->start,
2020                                                   resource_size(res),
2021                                                   DMA_MEMORY_MAP |
2022                                                   DMA_MEMORY_EXCLUSIVE);
2023                 if (!err) {
2024                         dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
2025                         err = -ENXIO;
2026                         goto exit_iounmap;
2027                 }
2028
2029                 pcdev->video_limit = resource_size(res);
2030         }
2031
2032         /* request irq */
2033         err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED,
2034                           dev_name(&pdev->dev), pcdev);
2035         if (err) {
2036                 dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
2037                 goto exit_release_mem;
2038         }
2039
2040         pm_suspend_ignore_children(&pdev->dev, true);
2041         pm_runtime_enable(&pdev->dev);
2042         pm_runtime_resume(&pdev->dev);
2043
2044         pcdev->ici.priv = pcdev;
2045         pcdev->ici.v4l2_dev.dev = &pdev->dev;
2046         pcdev->ici.nr = pdev->id;
2047         pcdev->ici.drv_name = dev_name(&pdev->dev);
2048         pcdev->ici.ops = &sh_mobile_ceu_host_ops;
2049
2050         pcdev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
2051         if (IS_ERR(pcdev->alloc_ctx)) {
2052                 err = PTR_ERR(pcdev->alloc_ctx);
2053                 goto exit_free_clk;
2054         }
2055
2056         err = soc_camera_host_register(&pcdev->ici);
2057         if (err)
2058                 goto exit_free_ctx;
2059
2060         /* CSI2 interfacing */
2061         csi2 = pcdev->pdata->csi2;
2062         if (csi2) {
2063                 struct platform_device *csi2_pdev =
2064                         platform_device_alloc("sh-mobile-csi2", csi2->id);
2065                 struct sh_csi2_pdata *csi2_pdata = csi2->platform_data;
2066
2067                 if (!csi2_pdev) {
2068                         err = -ENOMEM;
2069                         goto exit_host_unregister;
2070                 }
2071
2072                 pcdev->csi2_pdev                = csi2_pdev;
2073
2074                 err = platform_device_add_data(csi2_pdev, csi2_pdata, sizeof(*csi2_pdata));
2075                 if (err < 0)
2076                         goto exit_pdev_put;
2077
2078                 csi2_pdata                      = csi2_pdev->dev.platform_data;
2079                 csi2_pdata->v4l2_dev            = &pcdev->ici.v4l2_dev;
2080
2081                 csi2_pdev->resource             = csi2->resource;
2082                 csi2_pdev->num_resources        = csi2->num_resources;
2083
2084                 err = platform_device_add(csi2_pdev);
2085                 if (err < 0)
2086                         goto exit_pdev_put;
2087
2088                 wait.dev = &csi2_pdev->dev;
2089
2090                 err = bus_register_notifier(&platform_bus_type, &wait.notifier);
2091                 if (err < 0)
2092                         goto exit_pdev_unregister;
2093
2094                 /*
2095                  * From this point the driver module will not unload, until
2096                  * we complete the completion.
2097                  */
2098
2099                 if (!csi2_pdev->dev.driver) {
2100                         complete(&wait.completion);
2101                         /* Either too late, or probing failed */
2102                         bus_unregister_notifier(&platform_bus_type, &wait.notifier);
2103                         err = -ENXIO;
2104                         goto exit_pdev_unregister;
2105                 }
2106
2107                 /*
2108                  * The module is still loaded, in the worst case it is hanging
2109                  * in device release on our completion. So, _now_ dereferencing
2110                  * the "owner" is safe!
2111                  */
2112
2113                 err = try_module_get(csi2_pdev->dev.driver->owner);
2114
2115                 /* Let notifier complete, if it has been locked */
2116                 complete(&wait.completion);
2117                 bus_unregister_notifier(&platform_bus_type, &wait.notifier);
2118                 if (!err) {
2119                         err = -ENODEV;
2120                         goto exit_pdev_unregister;
2121                 }
2122         }
2123
2124         return 0;
2125
2126 exit_pdev_unregister:
2127         platform_device_del(pcdev->csi2_pdev);
2128 exit_pdev_put:
2129         pcdev->csi2_pdev->resource = NULL;
2130         platform_device_put(pcdev->csi2_pdev);
2131 exit_host_unregister:
2132         soc_camera_host_unregister(&pcdev->ici);
2133 exit_free_ctx:
2134         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
2135 exit_free_clk:
2136         pm_runtime_disable(&pdev->dev);
2137         free_irq(pcdev->irq, pcdev);
2138 exit_release_mem:
2139         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
2140                 dma_release_declared_memory(&pdev->dev);
2141 exit_iounmap:
2142         iounmap(base);
2143 exit_kfree:
2144         kfree(pcdev);
2145 exit:
2146         return err;
2147 }
2148
2149 static int __devexit sh_mobile_ceu_remove(struct platform_device *pdev)
2150 {
2151         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
2152         struct sh_mobile_ceu_dev *pcdev = container_of(soc_host,
2153                                         struct sh_mobile_ceu_dev, ici);
2154         struct platform_device *csi2_pdev = pcdev->csi2_pdev;
2155
2156         soc_camera_host_unregister(soc_host);
2157         pm_runtime_disable(&pdev->dev);
2158         free_irq(pcdev->irq, pcdev);
2159         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
2160                 dma_release_declared_memory(&pdev->dev);
2161         iounmap(pcdev->base);
2162         vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
2163         if (csi2_pdev && csi2_pdev->dev.driver) {
2164                 struct module *csi2_drv = csi2_pdev->dev.driver->owner;
2165                 platform_device_del(csi2_pdev);
2166                 csi2_pdev->resource = NULL;
2167                 platform_device_put(csi2_pdev);
2168                 module_put(csi2_drv);
2169         }
2170         kfree(pcdev);
2171
2172         return 0;
2173 }
2174
2175 static int sh_mobile_ceu_runtime_nop(struct device *dev)
2176 {
2177         /* Runtime PM callback shared between ->runtime_suspend()
2178          * and ->runtime_resume(). Simply returns success.
2179          *
2180          * This driver re-initializes all registers after
2181          * pm_runtime_get_sync() anyway so there is no need
2182          * to save and restore registers here.
2183          */
2184         return 0;
2185 }
2186
2187 static const struct dev_pm_ops sh_mobile_ceu_dev_pm_ops = {
2188         .runtime_suspend = sh_mobile_ceu_runtime_nop,
2189         .runtime_resume = sh_mobile_ceu_runtime_nop,
2190 };
2191
2192 static struct platform_driver sh_mobile_ceu_driver = {
2193         .driver         = {
2194                 .name   = "sh_mobile_ceu",
2195                 .pm     = &sh_mobile_ceu_dev_pm_ops,
2196         },
2197         .probe          = sh_mobile_ceu_probe,
2198         .remove         = __devexit_p(sh_mobile_ceu_remove),
2199 };
2200
2201 static int __init sh_mobile_ceu_init(void)
2202 {
2203         /* Whatever return code */
2204         request_module("sh_mobile_csi2");
2205         return platform_driver_register(&sh_mobile_ceu_driver);
2206 }
2207
2208 static void __exit sh_mobile_ceu_exit(void)
2209 {
2210         platform_driver_unregister(&sh_mobile_ceu_driver);
2211 }
2212
2213 module_init(sh_mobile_ceu_init);
2214 module_exit(sh_mobile_ceu_exit);
2215
2216 MODULE_DESCRIPTION("SuperH Mobile CEU driver");
2217 MODULE_AUTHOR("Magnus Damm");
2218 MODULE_LICENSE("GPL");
2219 MODULE_VERSION("0.0.6");
2220 MODULE_ALIAS("platform:sh_mobile_ceu");