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