linux/drivers/media/video/sh_mobile_ceu_camera.c
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   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/videobuf-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 */
  89struct sh_mobile_ceu_buffer {
  90        struct videobuf_buffer vb; /* v4l buffer must be first */
  91        enum v4l2_mbus_pixelcode code;
  92};
  93
  94struct sh_mobile_ceu_dev {
  95        struct soc_camera_host ici;
  96        struct soc_camera_device *icd;
  97
  98        unsigned int irq;
  99        void __iomem *base;
 100        unsigned long video_limit;
 101
 102        /* lock used to protect videobuf */
 103        spinlock_t lock;
 104        struct list_head capture;
 105        struct videobuf_buffer *active;
 106
 107        struct sh_mobile_ceu_info *pdata;
 108
 109        u32 cflcr;
 110
 111        enum v4l2_field field;
 112
 113        unsigned int image_mode:1;
 114        unsigned int is_16bit:1;
 115};
 116
 117struct sh_mobile_ceu_cam {
 118        /* CEU offsets within scaled by the CEU camera output */
 119        unsigned int ceu_left;
 120        unsigned int ceu_top;
 121        /* Client output, as seen by the CEU */
 122        unsigned int width;
 123        unsigned int height;
 124        /*
 125         * User window from S_CROP / G_CROP, produced by client cropping and
 126         * scaling, CEU scaling and CEU cropping, mapped back onto the client
 127         * input window
 128         */
 129        struct v4l2_rect subrect;
 130        /* Camera cropping rectangle */
 131        struct v4l2_rect rect;
 132        const struct soc_mbus_pixelfmt *extra_fmt;
 133        enum v4l2_mbus_pixelcode code;
 134};
 135
 136static unsigned long make_bus_param(struct sh_mobile_ceu_dev *pcdev)
 137{
 138        unsigned long flags;
 139
 140        flags = SOCAM_MASTER |
 141                SOCAM_PCLK_SAMPLE_RISING |
 142                SOCAM_HSYNC_ACTIVE_HIGH |
 143                SOCAM_HSYNC_ACTIVE_LOW |
 144                SOCAM_VSYNC_ACTIVE_HIGH |
 145                SOCAM_VSYNC_ACTIVE_LOW |
 146                SOCAM_DATA_ACTIVE_HIGH;
 147
 148        if (pcdev->pdata->flags & SH_CEU_FLAG_USE_8BIT_BUS)
 149                flags |= SOCAM_DATAWIDTH_8;
 150
 151        if (pcdev->pdata->flags & SH_CEU_FLAG_USE_16BIT_BUS)
 152                flags |= SOCAM_DATAWIDTH_16;
 153
 154        if (flags & SOCAM_DATAWIDTH_MASK)
 155                return flags;
 156
 157        return 0;
 158}
 159
 160static void ceu_write(struct sh_mobile_ceu_dev *priv,
 161                      unsigned long reg_offs, u32 data)
 162{
 163        iowrite32(data, priv->base + reg_offs);
 164}
 165
 166static u32 ceu_read(struct sh_mobile_ceu_dev *priv, unsigned long reg_offs)
 167{
 168        return ioread32(priv->base + reg_offs);
 169}
 170
 171static int sh_mobile_ceu_soft_reset(struct sh_mobile_ceu_dev *pcdev)
 172{
 173        int i, success = 0;
 174        struct soc_camera_device *icd = pcdev->icd;
 175
 176        ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
 177
 178        /* wait CSTSR.CPTON bit */
 179        for (i = 0; i < 1000; i++) {
 180                if (!(ceu_read(pcdev, CSTSR) & 1)) {
 181                        success++;
 182                        break;
 183                }
 184                udelay(1);
 185        }
 186
 187        /* wait CAPSR.CPKIL bit */
 188        for (i = 0; i < 1000; i++) {
 189                if (!(ceu_read(pcdev, CAPSR) & (1 << 16))) {
 190                        success++;
 191                        break;
 192                }
 193                udelay(1);
 194        }
 195
 196
 197        if (2 != success) {
 198                dev_warn(&icd->dev, "soft reset time out\n");
 199                return -EIO;
 200        }
 201
 202        return 0;
 203}
 204
 205/*
 206 *  Videobuf operations
 207 */
 208static int sh_mobile_ceu_videobuf_setup(struct videobuf_queue *vq,
 209                                        unsigned int *count,
 210                                        unsigned int *size)
 211{
 212        struct soc_camera_device *icd = vq->priv_data;
 213        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 214        struct sh_mobile_ceu_dev *pcdev = ici->priv;
 215        int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 216                                                icd->current_fmt->host_fmt);
 217
 218        if (bytes_per_line < 0)
 219                return bytes_per_line;
 220
 221        *size = bytes_per_line * icd->user_height;
 222
 223        if (0 == *count)
 224                *count = 2;
 225
 226        if (pcdev->video_limit) {
 227                if (PAGE_ALIGN(*size) * *count > pcdev->video_limit)
 228                        *count = pcdev->video_limit / PAGE_ALIGN(*size);
 229        }
 230
 231        dev_dbg(icd->dev.parent, "count=%d, size=%d\n", *count, *size);
 232
 233        return 0;
 234}
 235
 236static void free_buffer(struct videobuf_queue *vq,
 237                        struct sh_mobile_ceu_buffer *buf)
 238{
 239        struct soc_camera_device *icd = vq->priv_data;
 240        struct device *dev = icd->dev.parent;
 241
 242        dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
 243                &buf->vb, buf->vb.baddr, buf->vb.bsize);
 244
 245        if (in_interrupt())
 246                BUG();
 247
 248        videobuf_waiton(&buf->vb, 0, 0);
 249        videobuf_dma_contig_free(vq, &buf->vb);
 250        dev_dbg(dev, "%s freed\n", __func__);
 251        buf->vb.state = VIDEOBUF_NEEDS_INIT;
 252}
 253
 254#define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */
 255#define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */
 256#define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */
 257#define CEU_CEIER_VBP   (1 << 20) /* vbp error */
 258#define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */
 259#define CEU_CEIER_MASK (CEU_CEIER_CPEIE | CEU_CEIER_VBP)
 260
 261
 262/*
 263 * return value doesn't reflex the success/failure to queue the new buffer,
 264 * but rather the status of the previous buffer.
 265 */
 266static int sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
 267{
 268        struct soc_camera_device *icd = pcdev->icd;
 269        dma_addr_t phys_addr_top, phys_addr_bottom;
 270        unsigned long top1, top2;
 271        unsigned long bottom1, bottom2;
 272        u32 status;
 273        int ret = 0;
 274
 275        /*
 276         * The hardware is _very_ picky about this sequence. Especially
 277         * the CEU_CETCR_MAGIC value. It seems like we need to acknowledge
 278         * several not-so-well documented interrupt sources in CETCR.
 279         */
 280        ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_MASK);
 281        status = ceu_read(pcdev, CETCR);
 282        ceu_write(pcdev, CETCR, ~status & CEU_CETCR_MAGIC);
 283        ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_MASK);
 284        ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP);
 285        ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW);
 286
 287        /*
 288         * When a VBP interrupt occurs, a capture end interrupt does not occur
 289         * and the image of that frame is not captured correctly. So, soft reset
 290         * is needed here.
 291         */
 292        if (status & CEU_CEIER_VBP) {
 293                sh_mobile_ceu_soft_reset(pcdev);
 294                ret = -EIO;
 295        }
 296
 297        if (!pcdev->active)
 298                return ret;
 299
 300        if (V4L2_FIELD_INTERLACED_BT == pcdev->field) {
 301                top1    = CDBYR;
 302                top2    = CDBCR;
 303                bottom1 = CDAYR;
 304                bottom2 = CDACR;
 305        } else {
 306                top1    = CDAYR;
 307                top2    = CDACR;
 308                bottom1 = CDBYR;
 309                bottom2 = CDBCR;
 310        }
 311
 312        phys_addr_top = videobuf_to_dma_contig(pcdev->active);
 313        ceu_write(pcdev, top1, phys_addr_top);
 314        if (V4L2_FIELD_NONE != pcdev->field) {
 315                phys_addr_bottom = phys_addr_top + icd->user_width;
 316                ceu_write(pcdev, bottom1, phys_addr_bottom);
 317        }
 318
 319        switch (icd->current_fmt->host_fmt->fourcc) {
 320        case V4L2_PIX_FMT_NV12:
 321        case V4L2_PIX_FMT_NV21:
 322        case V4L2_PIX_FMT_NV16:
 323        case V4L2_PIX_FMT_NV61:
 324                phys_addr_top += icd->user_width *
 325                        icd->user_height;
 326                ceu_write(pcdev, top2, phys_addr_top);
 327                if (V4L2_FIELD_NONE != pcdev->field) {
 328                        phys_addr_bottom = phys_addr_top + icd->user_width;
 329                        ceu_write(pcdev, bottom2, phys_addr_bottom);
 330                }
 331        }
 332
 333        pcdev->active->state = VIDEOBUF_ACTIVE;
 334        ceu_write(pcdev, CAPSR, 0x1); /* start capture */
 335
 336        return ret;
 337}
 338
 339static int sh_mobile_ceu_videobuf_prepare(struct videobuf_queue *vq,
 340                                          struct videobuf_buffer *vb,
 341                                          enum v4l2_field field)
 342{
 343        struct soc_camera_device *icd = vq->priv_data;
 344        struct sh_mobile_ceu_buffer *buf;
 345        int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 346                                                icd->current_fmt->host_fmt);
 347        int ret;
 348
 349        if (bytes_per_line < 0)
 350                return bytes_per_line;
 351
 352        buf = container_of(vb, struct sh_mobile_ceu_buffer, vb);
 353
 354        dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
 355                vb, vb->baddr, vb->bsize);
 356
 357        /* Added list head initialization on alloc */
 358        WARN_ON(!list_empty(&vb->queue));
 359
 360#ifdef DEBUG
 361        /*
 362         * This can be useful if you want to see if we actually fill
 363         * the buffer with something
 364         */
 365        memset((void *)vb->baddr, 0xaa, vb->bsize);
 366#endif
 367
 368        BUG_ON(NULL == icd->current_fmt);
 369
 370        if (buf->code   != icd->current_fmt->code ||
 371            vb->width   != icd->user_width ||
 372            vb->height  != icd->user_height ||
 373            vb->field   != field) {
 374                buf->code       = icd->current_fmt->code;
 375                vb->width       = icd->user_width;
 376                vb->height      = icd->user_height;
 377                vb->field       = field;
 378                vb->state       = VIDEOBUF_NEEDS_INIT;
 379        }
 380
 381        vb->size = vb->height * bytes_per_line;
 382        if (0 != vb->baddr && vb->bsize < vb->size) {
 383                ret = -EINVAL;
 384                goto out;
 385        }
 386
 387        if (vb->state == VIDEOBUF_NEEDS_INIT) {
 388                ret = videobuf_iolock(vq, vb, NULL);
 389                if (ret)
 390                        goto fail;
 391                vb->state = VIDEOBUF_PREPARED;
 392        }
 393
 394        return 0;
 395fail:
 396        free_buffer(vq, buf);
 397out:
 398        return ret;
 399}
 400
 401/* Called under spinlock_irqsave(&pcdev->lock, ...) */
 402static void sh_mobile_ceu_videobuf_queue(struct videobuf_queue *vq,
 403                                         struct videobuf_buffer *vb)
 404{
 405        struct soc_camera_device *icd = vq->priv_data;
 406        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 407        struct sh_mobile_ceu_dev *pcdev = ici->priv;
 408
 409        dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
 410                vb, vb->baddr, vb->bsize);
 411
 412        vb->state = VIDEOBUF_QUEUED;
 413        list_add_tail(&vb->queue, &pcdev->capture);
 414
 415        if (!pcdev->active) {
 416                /*
 417                 * Because there were no active buffer at this moment,
 418                 * we are not interested in the return value of
 419                 * sh_mobile_ceu_capture here.
 420                 */
 421                pcdev->active = vb;
 422                sh_mobile_ceu_capture(pcdev);
 423        }
 424}
 425
 426static void sh_mobile_ceu_videobuf_release(struct videobuf_queue *vq,
 427                                           struct videobuf_buffer *vb)
 428{
 429        struct soc_camera_device *icd = vq->priv_data;
 430        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 431        struct sh_mobile_ceu_dev *pcdev = ici->priv;
 432        unsigned long flags;
 433
 434        spin_lock_irqsave(&pcdev->lock, flags);
 435
 436        if (pcdev->active == vb) {
 437                /* disable capture (release DMA buffer), reset */
 438                ceu_write(pcdev, CAPSR, 1 << 16);
 439                pcdev->active = NULL;
 440        }
 441
 442        if ((vb->state == VIDEOBUF_ACTIVE || vb->state == VIDEOBUF_QUEUED) &&
 443            !list_empty(&vb->queue)) {
 444                vb->state = VIDEOBUF_ERROR;
 445                list_del_init(&vb->queue);
 446        }
 447
 448        spin_unlock_irqrestore(&pcdev->lock, flags);
 449
 450        free_buffer(vq, container_of(vb, struct sh_mobile_ceu_buffer, vb));
 451}
 452
 453static struct videobuf_queue_ops sh_mobile_ceu_videobuf_ops = {
 454        .buf_setup      = sh_mobile_ceu_videobuf_setup,
 455        .buf_prepare    = sh_mobile_ceu_videobuf_prepare,
 456        .buf_queue      = sh_mobile_ceu_videobuf_queue,
 457        .buf_release    = sh_mobile_ceu_videobuf_release,
 458};
 459
 460static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
 461{
 462        struct sh_mobile_ceu_dev *pcdev = data;
 463        struct videobuf_buffer *vb;
 464        unsigned long flags;
 465
 466        spin_lock_irqsave(&pcdev->lock, flags);
 467
 468        vb = pcdev->active;
 469        if (!vb)
 470                /* Stale interrupt from a released buffer */
 471                goto out;
 472
 473        list_del_init(&vb->queue);
 474
 475        if (!list_empty(&pcdev->capture))
 476                pcdev->active = list_entry(pcdev->capture.next,
 477                                           struct videobuf_buffer, queue);
 478        else
 479                pcdev->active = NULL;
 480
 481        vb->state = (sh_mobile_ceu_capture(pcdev) < 0) ?
 482                VIDEOBUF_ERROR : VIDEOBUF_DONE;
 483        do_gettimeofday(&vb->ts);
 484        vb->field_count++;
 485        wake_up(&vb->done);
 486
 487out:
 488        spin_unlock_irqrestore(&pcdev->lock, flags);
 489
 490        return IRQ_HANDLED;
 491}
 492
 493/* Called with .video_lock held */
 494static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
 495{
 496        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 497        struct sh_mobile_ceu_dev *pcdev = ici->priv;
 498        int ret;
 499
 500        if (pcdev->icd)
 501                return -EBUSY;
 502
 503        dev_info(icd->dev.parent,
 504                 "SuperH Mobile CEU driver attached to camera %d\n",
 505                 icd->devnum);
 506
 507        pm_runtime_get_sync(ici->v4l2_dev.dev);
 508
 509        ret = sh_mobile_ceu_soft_reset(pcdev);
 510        if (!ret)
 511                pcdev->icd = icd;
 512
 513        return ret;
 514}
 515
 516/* Called with .video_lock held */
 517static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
 518{
 519        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 520        struct sh_mobile_ceu_dev *pcdev = ici->priv;
 521        unsigned long flags;
 522
 523        BUG_ON(icd != pcdev->icd);
 524
 525        /* disable capture, disable interrupts */
 526        ceu_write(pcdev, CEIER, 0);
 527        sh_mobile_ceu_soft_reset(pcdev);
 528
 529        /* make sure active buffer is canceled */
 530        spin_lock_irqsave(&pcdev->lock, flags);
 531        if (pcdev->active) {
 532                list_del(&pcdev->active->queue);
 533                pcdev->active->state = VIDEOBUF_ERROR;
 534                wake_up_all(&pcdev->active->done);
 535                pcdev->active = NULL;
 536        }
 537        spin_unlock_irqrestore(&pcdev->lock, flags);
 538
 539        pm_runtime_put_sync(ici->v4l2_dev.dev);
 540
 541        dev_info(icd->dev.parent,
 542                 "SuperH Mobile CEU driver detached from camera %d\n",
 543                 icd->devnum);
 544
 545        pcdev->icd = NULL;
 546}
 547
 548/*
 549 * See chapter 29.4.12 "Capture Filter Control Register (CFLCR)"
 550 * in SH7722 Hardware Manual
 551 */
 552static unsigned int size_dst(unsigned int src, unsigned int scale)
 553{
 554        unsigned int mant_pre = scale >> 12;
 555        if (!src || !scale)
 556                return src;
 557        return ((mant_pre + 2 * (src - 1)) / (2 * mant_pre) - 1) *
 558                mant_pre * 4096 / scale + 1;
 559}
 560
 561static u16 calc_scale(unsigned int src, unsigned int *dst)
 562{
 563        u16 scale;
 564
 565        if (src == *dst)
 566                return 0;
 567
 568        scale = (src * 4096 / *dst) & ~7;
 569
 570        while (scale > 4096 && size_dst(src, scale) < *dst)
 571                scale -= 8;
 572
 573        *dst = size_dst(src, scale);
 574
 575        return scale;
 576}
 577
 578/* rect is guaranteed to not exceed the scaled camera rectangle */
 579static void sh_mobile_ceu_set_rect(struct soc_camera_device *icd)
 580{
 581        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 582        struct sh_mobile_ceu_cam *cam = icd->host_priv;
 583        struct sh_mobile_ceu_dev *pcdev = ici->priv;
 584        unsigned int height, width, cdwdr_width, in_width, in_height;
 585        unsigned int left_offset, top_offset;
 586        u32 camor;
 587
 588        dev_geo(icd->dev.parent, "Crop %ux%u@%u:%u\n",
 589                icd->user_width, icd->user_height, cam->ceu_left, cam->ceu_top);
 590
 591        left_offset     = cam->ceu_left;
 592        top_offset      = cam->ceu_top;
 593
 594        /* CEU cropping (CFSZR) is applied _after_ the scaling filter (CFLCR) */
 595        if (pcdev->image_mode) {
 596                in_width = cam->width;
 597                if (!pcdev->is_16bit) {
 598                        in_width *= 2;
 599                        left_offset *= 2;
 600                }
 601                width = icd->user_width;
 602                cdwdr_width = icd->user_width;
 603        } else {
 604                int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 605                                                icd->current_fmt->host_fmt);
 606                unsigned int w_factor;
 607
 608                width = icd->user_width;
 609
 610                switch (icd->current_fmt->host_fmt->packing) {
 611                case SOC_MBUS_PACKING_2X8_PADHI:
 612                        w_factor = 2;
 613                        break;
 614                default:
 615                        w_factor = 1;
 616                }
 617
 618                in_width = cam->width * w_factor;
 619                left_offset = left_offset * w_factor;
 620
 621                if (bytes_per_line < 0)
 622                        cdwdr_width = icd->user_width;
 623                else
 624                        cdwdr_width = bytes_per_line;
 625        }
 626
 627        height = icd->user_height;
 628        in_height = cam->height;
 629        if (V4L2_FIELD_NONE != pcdev->field) {
 630                height /= 2;
 631                in_height /= 2;
 632                top_offset /= 2;
 633                cdwdr_width *= 2;
 634        }
 635
 636        /* Set CAMOR, CAPWR, CFSZR, take care of CDWDR */
 637        camor = left_offset | (top_offset << 16);
 638
 639        dev_geo(icd->dev.parent,
 640                "CAMOR 0x%x, CAPWR 0x%x, CFSZR 0x%x, CDWDR 0x%x\n", camor,
 641                (in_height << 16) | in_width, (height << 16) | width,
 642                cdwdr_width);
 643
 644        ceu_write(pcdev, CAMOR, camor);
 645        ceu_write(pcdev, CAPWR, (in_height << 16) | in_width);
 646        ceu_write(pcdev, CFSZR, (height << 16) | width);
 647        ceu_write(pcdev, CDWDR, cdwdr_width);
 648}
 649
 650static u32 capture_save_reset(struct sh_mobile_ceu_dev *pcdev)
 651{
 652        u32 capsr = ceu_read(pcdev, CAPSR);
 653        ceu_write(pcdev, CAPSR, 1 << 16); /* reset, stop capture */
 654        return capsr;
 655}
 656
 657static void capture_restore(struct sh_mobile_ceu_dev *pcdev, u32 capsr)
 658{
 659        unsigned long timeout = jiffies + 10 * HZ;
 660
 661        /*
 662         * Wait until the end of the current frame. It can take a long time,
 663         * but if it has been aborted by a CAPSR reset, it shoule exit sooner.
 664         */
 665        while ((ceu_read(pcdev, CSTSR) & 1) && time_before(jiffies, timeout))
 666                msleep(1);
 667
 668        if (time_after(jiffies, timeout)) {
 669                dev_err(pcdev->ici.v4l2_dev.dev,
 670                        "Timeout waiting for frame end! Interface problem?\n");
 671                return;
 672        }
 673
 674        /* Wait until reset clears, this shall not hang... */
 675        while (ceu_read(pcdev, CAPSR) & (1 << 16))
 676                udelay(10);
 677
 678        /* Anything to restore? */
 679        if (capsr & ~(1 << 16))
 680                ceu_write(pcdev, CAPSR, capsr);
 681}
 682
 683static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
 684                                       __u32 pixfmt)
 685{
 686        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 687        struct sh_mobile_ceu_dev *pcdev = ici->priv;
 688        int ret;
 689        unsigned long camera_flags, common_flags, value;
 690        int yuv_lineskip;
 691        struct sh_mobile_ceu_cam *cam = icd->host_priv;
 692        u32 capsr = capture_save_reset(pcdev);
 693
 694        camera_flags = icd->ops->query_bus_param(icd);
 695        common_flags = soc_camera_bus_param_compatible(camera_flags,
 696                                                       make_bus_param(pcdev));
 697        if (!common_flags)
 698                return -EINVAL;
 699
 700        /* Make choises, based on platform preferences */
 701        if ((common_flags & SOCAM_HSYNC_ACTIVE_HIGH) &&
 702            (common_flags & SOCAM_HSYNC_ACTIVE_LOW)) {
 703                if (pcdev->pdata->flags & SH_CEU_FLAG_HSYNC_LOW)
 704                        common_flags &= ~SOCAM_HSYNC_ACTIVE_HIGH;
 705                else
 706                        common_flags &= ~SOCAM_HSYNC_ACTIVE_LOW;
 707        }
 708
 709        if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) &&
 710            (common_flags & SOCAM_VSYNC_ACTIVE_LOW)) {
 711                if (pcdev->pdata->flags & SH_CEU_FLAG_VSYNC_LOW)
 712                        common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH;
 713                else
 714                        common_flags &= ~SOCAM_VSYNC_ACTIVE_LOW;
 715        }
 716
 717        ret = icd->ops->set_bus_param(icd, common_flags);
 718        if (ret < 0)
 719                return ret;
 720
 721        switch (common_flags & SOCAM_DATAWIDTH_MASK) {
 722        case SOCAM_DATAWIDTH_8:
 723                pcdev->is_16bit = 0;
 724                break;
 725        case SOCAM_DATAWIDTH_16:
 726                pcdev->is_16bit = 1;
 727                break;
 728        default:
 729                return -EINVAL;
 730        }
 731
 732        ceu_write(pcdev, CRCNTR, 0);
 733        ceu_write(pcdev, CRCMPR, 0);
 734
 735        value = 0x00000010; /* data fetch by default */
 736        yuv_lineskip = 0;
 737
 738        switch (icd->current_fmt->host_fmt->fourcc) {
 739        case V4L2_PIX_FMT_NV12:
 740        case V4L2_PIX_FMT_NV21:
 741                yuv_lineskip = 1; /* skip for NV12/21, no skip for NV16/61 */
 742                /* fall-through */
 743        case V4L2_PIX_FMT_NV16:
 744        case V4L2_PIX_FMT_NV61:
 745                switch (cam->code) {
 746                case V4L2_MBUS_FMT_YUYV8_2X8_BE:
 747                        value = 0x00000000; /* Cb0, Y0, Cr0, Y1 */
 748                        break;
 749                case V4L2_MBUS_FMT_YVYU8_2X8_BE:
 750                        value = 0x00000100; /* Cr0, Y0, Cb0, Y1 */
 751                        break;
 752                case V4L2_MBUS_FMT_YUYV8_2X8_LE:
 753                        value = 0x00000200; /* Y0, Cb0, Y1, Cr0 */
 754                        break;
 755                case V4L2_MBUS_FMT_YVYU8_2X8_LE:
 756                        value = 0x00000300; /* Y0, Cr0, Y1, Cb0 */
 757                        break;
 758                default:
 759                        BUG();
 760                }
 761        }
 762
 763        if (icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV21 ||
 764            icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV61)
 765                value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */
 766
 767        value |= common_flags & SOCAM_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
 768        value |= common_flags & SOCAM_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
 769        value |= pcdev->is_16bit ? 1 << 12 : 0;
 770        ceu_write(pcdev, CAMCR, value);
 771
 772        ceu_write(pcdev, CAPCR, 0x00300000);
 773
 774        switch (pcdev->field) {
 775        case V4L2_FIELD_INTERLACED_TB:
 776                value = 0x101;
 777                break;
 778        case V4L2_FIELD_INTERLACED_BT:
 779                value = 0x102;
 780                break;
 781        default:
 782                value = 0;
 783                break;
 784        }
 785        ceu_write(pcdev, CAIFR, value);
 786
 787        sh_mobile_ceu_set_rect(icd);
 788        mdelay(1);
 789
 790        dev_geo(icd->dev.parent, "CFLCR 0x%x\n", pcdev->cflcr);
 791        ceu_write(pcdev, CFLCR, pcdev->cflcr);
 792
 793        /*
 794         * A few words about byte order (observed in Big Endian mode)
 795         *
 796         * In data fetch mode bytes are received in chunks of 8 bytes.
 797         * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
 798         *
 799         * The data is however by default written to memory in reverse order:
 800         * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
 801         *
 802         * The lowest three bits of CDOCR allows us to do swapping,
 803         * using 7 we swap the data bytes to match the incoming order:
 804         * D0, D1, D2, D3, D4, D5, D6, D7
 805         */
 806        value = 0x00000017;
 807        if (yuv_lineskip)
 808                value &= ~0x00000010; /* convert 4:2:2 -> 4:2:0 */
 809
 810        ceu_write(pcdev, CDOCR, value);
 811        ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
 812
 813        dev_dbg(icd->dev.parent, "S_FMT successful for %c%c%c%c %ux%u\n",
 814                pixfmt & 0xff, (pixfmt >> 8) & 0xff,
 815                (pixfmt >> 16) & 0xff, (pixfmt >> 24) & 0xff,
 816                icd->user_width, icd->user_height);
 817
 818        capture_restore(pcdev, capsr);
 819
 820        /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
 821        return 0;
 822}
 823
 824static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd,
 825                                       unsigned char buswidth)
 826{
 827        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 828        struct sh_mobile_ceu_dev *pcdev = ici->priv;
 829        unsigned long camera_flags, common_flags;
 830
 831        camera_flags = icd->ops->query_bus_param(icd);
 832        common_flags = soc_camera_bus_param_compatible(camera_flags,
 833                                                       make_bus_param(pcdev));
 834        if (!common_flags || buswidth > 16 ||
 835            (buswidth > 8 && !(common_flags & SOCAM_DATAWIDTH_16)))
 836                return -EINVAL;
 837
 838        return 0;
 839}
 840
 841static const struct soc_mbus_pixelfmt sh_mobile_ceu_formats[] = {
 842        {
 843                .fourcc                 = V4L2_PIX_FMT_NV12,
 844                .name                   = "NV12",
 845                .bits_per_sample        = 12,
 846                .packing                = SOC_MBUS_PACKING_NONE,
 847                .order                  = SOC_MBUS_ORDER_LE,
 848        }, {
 849                .fourcc                 = V4L2_PIX_FMT_NV21,
 850                .name                   = "NV21",
 851                .bits_per_sample        = 12,
 852                .packing                = SOC_MBUS_PACKING_NONE,
 853                .order                  = SOC_MBUS_ORDER_LE,
 854        }, {
 855                .fourcc                 = V4L2_PIX_FMT_NV16,
 856                .name                   = "NV16",
 857                .bits_per_sample        = 16,
 858                .packing                = SOC_MBUS_PACKING_NONE,
 859                .order                  = SOC_MBUS_ORDER_LE,
 860        }, {
 861                .fourcc                 = V4L2_PIX_FMT_NV61,
 862                .name                   = "NV61",
 863                .bits_per_sample        = 16,
 864                .packing                = SOC_MBUS_PACKING_NONE,
 865                .order                  = SOC_MBUS_ORDER_LE,
 866        },
 867};
 868
 869/* This will be corrected as we get more formats */
 870static bool sh_mobile_ceu_packing_supported(const struct soc_mbus_pixelfmt *fmt)
 871{
 872        return  fmt->packing == SOC_MBUS_PACKING_NONE ||
 873                (fmt->bits_per_sample == 8 &&
 874                 fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
 875                (fmt->bits_per_sample > 8 &&
 876                 fmt->packing == SOC_MBUS_PACKING_EXTEND16);
 877}
 878
 879static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect);
 880
 881static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, unsigned int idx,
 882                                     struct soc_camera_format_xlate *xlate)
 883{
 884        struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 885        struct device *dev = icd->dev.parent;
 886        int ret, k, n;
 887        int formats = 0;
 888        struct sh_mobile_ceu_cam *cam;
 889        enum v4l2_mbus_pixelcode code;
 890        const struct soc_mbus_pixelfmt *fmt;
 891
 892        ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
 893        if (ret < 0)
 894                /* No more formats */
 895                return 0;
 896
 897        fmt = soc_mbus_get_fmtdesc(code);
 898        if (!fmt) {
 899                dev_err(icd->dev.parent,
 900                        "Invalid format code #%u: %d\n", idx, code);
 901                return -EINVAL;
 902        }
 903
 904        ret = sh_mobile_ceu_try_bus_param(icd, fmt->bits_per_sample);
 905        if (ret < 0)
 906                return 0;
 907
 908        if (!icd->host_priv) {
 909                struct v4l2_mbus_framefmt mf;
 910                struct v4l2_rect rect;
 911                struct device *dev = icd->dev.parent;
 912                int shift = 0;
 913
 914                /* FIXME: subwindow is lost between close / open */
 915
 916                /* Cache current client geometry */
 917                ret = client_g_rect(sd, &rect);
 918                if (ret < 0)
 919                        return ret;
 920
 921                /* First time */
 922                ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
 923                if (ret < 0)
 924                        return ret;
 925
 926                while ((mf.width > 2560 || mf.height > 1920) && shift < 4) {
 927                        /* Try 2560x1920, 1280x960, 640x480, 320x240 */
 928                        mf.width        = 2560 >> shift;
 929                        mf.height       = 1920 >> shift;
 930                        ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
 931                        if (ret < 0)
 932                                return ret;
 933                        shift++;
 934                }
 935
 936                if (shift == 4) {
 937                        dev_err(dev, "Failed to configure the client below %ux%x\n",
 938                                mf.width, mf.height);
 939                        return -EIO;
 940                }
 941
 942                dev_geo(dev, "camera fmt %ux%u\n", mf.width, mf.height);
 943
 944                cam = kzalloc(sizeof(*cam), GFP_KERNEL);
 945                if (!cam)
 946                        return -ENOMEM;
 947
 948                /* We are called with current camera crop, initialise subrect with it */
 949                cam->rect       = rect;
 950                cam->subrect    = rect;
 951
 952                cam->width      = mf.width;
 953                cam->height     = mf.height;
 954
 955                cam->width      = mf.width;
 956                cam->height     = mf.height;
 957
 958                icd->host_priv = cam;
 959        } else {
 960                cam = icd->host_priv;
 961        }
 962
 963        /* Beginning of a pass */
 964        if (!idx)
 965                cam->extra_fmt = NULL;
 966
 967        switch (code) {
 968        case V4L2_MBUS_FMT_YUYV8_2X8_BE:
 969        case V4L2_MBUS_FMT_YVYU8_2X8_BE:
 970        case V4L2_MBUS_FMT_YUYV8_2X8_LE:
 971        case V4L2_MBUS_FMT_YVYU8_2X8_LE:
 972                if (cam->extra_fmt)
 973                        break;
 974
 975                /*
 976                 * Our case is simple so far: for any of the above four camera
 977                 * formats we add all our four synthesized NV* formats, so,
 978                 * just marking the device with a single flag suffices. If
 979                 * the format generation rules are more complex, you would have
 980                 * to actually hang your already added / counted formats onto
 981                 * the host_priv pointer and check whether the format you're
 982                 * going to add now is already there.
 983                 */
 984                cam->extra_fmt = sh_mobile_ceu_formats;
 985
 986                n = ARRAY_SIZE(sh_mobile_ceu_formats);
 987                formats += n;
 988                for (k = 0; xlate && k < n; k++) {
 989                        xlate->host_fmt = &sh_mobile_ceu_formats[k];
 990                        xlate->code     = code;
 991                        xlate++;
 992                        dev_dbg(dev, "Providing format %s using code %d\n",
 993                                sh_mobile_ceu_formats[k].name, code);
 994                }
 995                break;
 996        default:
 997                if (!sh_mobile_ceu_packing_supported(fmt))
 998                        return 0;
 999        }
1000
1001        /* Generic pass-through */
1002        formats++;
1003        if (xlate) {
1004                xlate->host_fmt = fmt;
1005                xlate->code     = code;
1006                xlate++;
1007                dev_dbg(dev, "Providing format %s in pass-through mode\n",
1008                        xlate->host_fmt->name);
1009        }
1010
1011        return formats;
1012}
1013
1014static void sh_mobile_ceu_put_formats(struct soc_camera_device *icd)
1015{
1016        kfree(icd->host_priv);
1017        icd->host_priv = NULL;
1018}
1019
1020/* Check if any dimension of r1 is smaller than respective one of r2 */
1021static bool is_smaller(struct v4l2_rect *r1, struct v4l2_rect *r2)
1022{
1023        return r1->width < r2->width || r1->height < r2->height;
1024}
1025
1026/* Check if r1 fails to cover r2 */
1027static bool is_inside(struct v4l2_rect *r1, struct v4l2_rect *r2)
1028{
1029        return r1->left > r2->left || r1->top > r2->top ||
1030                r1->left + r1->width < r2->left + r2->width ||
1031                r1->top + r1->height < r2->top + r2->height;
1032}
1033
1034static unsigned int scale_down(unsigned int size, unsigned int scale)
1035{
1036        return (size * 4096 + scale / 2) / scale;
1037}
1038
1039static unsigned int calc_generic_scale(unsigned int input, unsigned int output)
1040{
1041        return (input * 4096 + output / 2) / output;
1042}
1043
1044/* Get and store current client crop */
1045static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect)
1046{
1047        struct v4l2_crop crop;
1048        struct v4l2_cropcap cap;
1049        int ret;
1050
1051        crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1052
1053        ret = v4l2_subdev_call(sd, video, g_crop, &crop);
1054        if (!ret) {
1055                *rect = crop.c;
1056                return ret;
1057        }
1058
1059        /* Camera driver doesn't support .g_crop(), assume default rectangle */
1060        cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1061
1062        ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1063        if (!ret)
1064                *rect = cap.defrect;
1065
1066        return ret;
1067}
1068
1069/* Client crop has changed, update our sub-rectangle to remain within the area */
1070static void update_subrect(struct sh_mobile_ceu_cam *cam)
1071{
1072        struct v4l2_rect *rect = &cam->rect, *subrect = &cam->subrect;
1073
1074        if (rect->width < subrect->width)
1075                subrect->width = rect->width;
1076
1077        if (rect->height < subrect->height)
1078                subrect->height = rect->height;
1079
1080        if (rect->left > subrect->left)
1081                subrect->left = rect->left;
1082        else if (rect->left + rect->width >
1083                 subrect->left + subrect->width)
1084                subrect->left = rect->left + rect->width -
1085                        subrect->width;
1086
1087        if (rect->top > subrect->top)
1088                subrect->top = rect->top;
1089        else if (rect->top + rect->height >
1090                 subrect->top + subrect->height)
1091                subrect->top = rect->top + rect->height -
1092                        subrect->height;
1093}
1094
1095/*
1096 * The common for both scaling and cropping iterative approach is:
1097 * 1. try if the client can produce exactly what requested by the user
1098 * 2. if (1) failed, try to double the client image until we get one big enough
1099 * 3. if (2) failed, try to request the maximum image
1100 */
1101static int client_s_crop(struct soc_camera_device *icd, struct v4l2_crop *crop,
1102                         struct v4l2_crop *cam_crop)
1103{
1104        struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1105        struct v4l2_rect *rect = &crop->c, *cam_rect = &cam_crop->c;
1106        struct device *dev = sd->v4l2_dev->dev;
1107        struct sh_mobile_ceu_cam *cam = icd->host_priv;
1108        struct v4l2_cropcap cap;
1109        int ret;
1110        unsigned int width, height;
1111
1112        v4l2_subdev_call(sd, video, s_crop, crop);
1113        ret = client_g_rect(sd, cam_rect);
1114        if (ret < 0)
1115                return ret;
1116
1117        /*
1118         * Now cam_crop contains the current camera input rectangle, and it must
1119         * be within camera cropcap bounds
1120         */
1121        if (!memcmp(rect, cam_rect, sizeof(*rect))) {
1122                /* Even if camera S_CROP failed, but camera rectangle matches */
1123                dev_dbg(dev, "Camera S_CROP successful for %dx%d@%d:%d\n",
1124                        rect->width, rect->height, rect->left, rect->top);
1125                cam->rect = *cam_rect;
1126                return 0;
1127        }
1128
1129        /* Try to fix cropping, that camera hasn't managed to set */
1130        dev_geo(dev, "Fix camera S_CROP for %dx%d@%d:%d to %dx%d@%d:%d\n",
1131                cam_rect->width, cam_rect->height,
1132                cam_rect->left, cam_rect->top,
1133                rect->width, rect->height, rect->left, rect->top);
1134
1135        /* We need sensor maximum rectangle */
1136        ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1137        if (ret < 0)
1138                return ret;
1139
1140        /* Put user requested rectangle within sensor bounds */
1141        soc_camera_limit_side(&rect->left, &rect->width, cap.bounds.left, 2,
1142                              cap.bounds.width);
1143        soc_camera_limit_side(&rect->top, &rect->height, cap.bounds.top, 4,
1144                              cap.bounds.height);
1145
1146        /*
1147         * Popular special case - some cameras can only handle fixed sizes like
1148         * QVGA, VGA,... Take care to avoid infinite loop.
1149         */
1150        width = max(cam_rect->width, 2);
1151        height = max(cam_rect->height, 2);
1152
1153        /*
1154         * Loop as long as sensor is not covering the requested rectangle and
1155         * is still within its bounds
1156         */
1157        while (!ret && (is_smaller(cam_rect, rect) ||
1158                        is_inside(cam_rect, rect)) &&
1159               (cap.bounds.width > width || cap.bounds.height > height)) {
1160
1161                width *= 2;
1162                height *= 2;
1163
1164                cam_rect->width = width;
1165                cam_rect->height = height;
1166
1167                /*
1168                 * We do not know what capabilities the camera has to set up
1169                 * left and top borders. We could try to be smarter in iterating
1170                 * them, e.g., if camera current left is to the right of the
1171                 * target left, set it to the middle point between the current
1172                 * left and minimum left. But that would add too much
1173                 * complexity: we would have to iterate each border separately.
1174                 * Instead we just drop to the left and top bounds.
1175                 */
1176                if (cam_rect->left > rect->left)
1177                        cam_rect->left = cap.bounds.left;
1178
1179                if (cam_rect->left + cam_rect->width < rect->left + rect->width)
1180                        cam_rect->width = rect->left + rect->width -
1181                                cam_rect->left;
1182
1183                if (cam_rect->top > rect->top)
1184                        cam_rect->top = cap.bounds.top;
1185
1186                if (cam_rect->top + cam_rect->height < rect->top + rect->height)
1187                        cam_rect->height = rect->top + rect->height -
1188                                cam_rect->top;
1189
1190                v4l2_subdev_call(sd, video, s_crop, cam_crop);
1191                ret = client_g_rect(sd, cam_rect);
1192                dev_geo(dev, "Camera S_CROP %d for %dx%d@%d:%d\n", ret,
1193                        cam_rect->width, cam_rect->height,
1194                        cam_rect->left, cam_rect->top);
1195        }
1196
1197        /* S_CROP must not modify the rectangle */
1198        if (is_smaller(cam_rect, rect) || is_inside(cam_rect, rect)) {
1199                /*
1200                 * The camera failed to configure a suitable cropping,
1201                 * we cannot use the current rectangle, set to max
1202                 */
1203                *cam_rect = cap.bounds;
1204                v4l2_subdev_call(sd, video, s_crop, cam_crop);
1205                ret = client_g_rect(sd, cam_rect);
1206                dev_geo(dev, "Camera S_CROP %d for max %dx%d@%d:%d\n", ret,
1207                        cam_rect->width, cam_rect->height,
1208                        cam_rect->left, cam_rect->top);
1209        }
1210
1211        if (!ret) {
1212                cam->rect = *cam_rect;
1213                update_subrect(cam);
1214        }
1215
1216        return ret;
1217}
1218
1219/* Iterative s_mbus_fmt, also updates cached client crop on success */
1220static int client_s_fmt(struct soc_camera_device *icd,
1221                        struct v4l2_mbus_framefmt *mf, bool ceu_can_scale)
1222{
1223        struct sh_mobile_ceu_cam *cam = icd->host_priv;
1224        struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1225        struct device *dev = icd->dev.parent;
1226        unsigned int width = mf->width, height = mf->height, tmp_w, tmp_h;
1227        unsigned int max_width, max_height;
1228        struct v4l2_cropcap cap;
1229        int ret;
1230
1231        ret = v4l2_subdev_call(sd, video, s_mbus_fmt, mf);
1232        if (ret < 0)
1233                return ret;
1234
1235        dev_geo(dev, "camera scaled to %ux%u\n", mf->width, mf->height);
1236
1237        if ((width == mf->width && height == mf->height) || !ceu_can_scale)
1238                goto update_cache;
1239
1240        cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1241
1242        ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1243        if (ret < 0)
1244                return ret;
1245
1246        max_width = min(cap.bounds.width, 2560);
1247        max_height = min(cap.bounds.height, 1920);
1248
1249        /* Camera set a format, but geometry is not precise, try to improve */
1250        tmp_w = mf->width;
1251        tmp_h = mf->height;
1252
1253        /* width <= max_width && height <= max_height - guaranteed by try_fmt */
1254        while ((width > tmp_w || height > tmp_h) &&
1255               tmp_w < max_width && tmp_h < max_height) {
1256                tmp_w = min(2 * tmp_w, max_width);
1257                tmp_h = min(2 * tmp_h, max_height);
1258                mf->width = tmp_w;
1259                mf->height = tmp_h;
1260                ret = v4l2_subdev_call(sd, video, s_mbus_fmt, mf);
1261                dev_geo(dev, "Camera scaled to %ux%u\n",
1262                        mf->width, mf->height);
1263                if (ret < 0) {
1264                        /* This shouldn't happen */
1265                        dev_err(dev, "Client failed to set format: %d\n", ret);
1266                        return ret;
1267                }
1268        }
1269
1270update_cache:
1271        /* Update cache */
1272        ret = client_g_rect(sd, &cam->rect);
1273        if (ret < 0)
1274                return ret;
1275
1276        update_subrect(cam);
1277
1278        return 0;
1279}
1280
1281/**
1282 * @width       - on output: user width, mapped back to input
1283 * @height      - on output: user height, mapped back to input
1284 * @mf          - in- / output camera output window
1285 */
1286static int client_scale(struct soc_camera_device *icd,
1287                        struct v4l2_mbus_framefmt *mf,
1288                        unsigned int *width, unsigned int *height,
1289                        bool ceu_can_scale)
1290{
1291        struct sh_mobile_ceu_cam *cam = icd->host_priv;
1292        struct device *dev = icd->dev.parent;
1293        struct v4l2_mbus_framefmt mf_tmp = *mf;
1294        unsigned int scale_h, scale_v;
1295        int ret;
1296
1297        /*
1298         * 5. Apply iterative camera S_FMT for camera user window (also updates
1299         *    client crop cache and the imaginary sub-rectangle).
1300         */
1301        ret = client_s_fmt(icd, &mf_tmp, ceu_can_scale);
1302        if (ret < 0)
1303                return ret;
1304
1305        dev_geo(dev, "5: camera scaled to %ux%u\n",
1306                mf_tmp.width, mf_tmp.height);
1307
1308        /* 6. Retrieve camera output window (g_fmt) */
1309
1310        /* unneeded - it is already in "mf_tmp" */
1311
1312        /* 7. Calculate new client scales. */
1313        scale_h = calc_generic_scale(cam->rect.width, mf_tmp.width);
1314        scale_v = calc_generic_scale(cam->rect.height, mf_tmp.height);
1315
1316        mf->width       = mf_tmp.width;
1317        mf->height      = mf_tmp.height;
1318        mf->colorspace  = mf_tmp.colorspace;
1319
1320        /*
1321         * 8. Calculate new CEU crop - apply camera scales to previously
1322         *    updated "effective" crop.
1323         */
1324        *width = scale_down(cam->subrect.width, scale_h);
1325        *height = scale_down(cam->subrect.height, scale_v);
1326
1327        dev_geo(dev, "8: new client sub-window %ux%u\n", *width, *height);
1328
1329        return 0;
1330}
1331
1332/*
1333 * CEU can scale and crop, but we don't want to waste bandwidth and kill the
1334 * framerate by always requesting the maximum image from the client. See
1335 * Documentation/video4linux/sh_mobile_camera_ceu.txt for a description of
1336 * scaling and cropping algorithms and for the meaning of referenced here steps.
1337 */
1338static int sh_mobile_ceu_set_crop(struct soc_camera_device *icd,
1339                                  struct v4l2_crop *a)
1340{
1341        struct v4l2_rect *rect = &a->c;
1342        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1343        struct sh_mobile_ceu_dev *pcdev = ici->priv;
1344        struct v4l2_crop cam_crop;
1345        struct sh_mobile_ceu_cam *cam = icd->host_priv;
1346        struct v4l2_rect *cam_rect = &cam_crop.c;
1347        struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1348        struct device *dev = icd->dev.parent;
1349        struct v4l2_mbus_framefmt mf;
1350        unsigned int scale_cam_h, scale_cam_v, scale_ceu_h, scale_ceu_v,
1351                out_width, out_height, scale_h, scale_v;
1352        int interm_width, interm_height;
1353        u32 capsr, cflcr;
1354        int ret;
1355
1356        dev_geo(dev, "S_CROP(%ux%u@%u:%u)\n", rect->width, rect->height,
1357                rect->left, rect->top);
1358
1359        /* During camera cropping its output window can change too, stop CEU */
1360        capsr = capture_save_reset(pcdev);
1361        dev_dbg(dev, "CAPSR 0x%x, CFLCR 0x%x\n", capsr, pcdev->cflcr);
1362
1363        /* 1. - 2. Apply iterative camera S_CROP for new input window. */
1364        ret = client_s_crop(icd, a, &cam_crop);
1365        if (ret < 0)
1366                return ret;
1367
1368        dev_geo(dev, "1-2: camera cropped to %ux%u@%u:%u\n",
1369                cam_rect->width, cam_rect->height,
1370                cam_rect->left, cam_rect->top);
1371
1372        /* On success cam_crop contains current camera crop */
1373
1374        /* 3. Retrieve camera output window */
1375        ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
1376        if (ret < 0)
1377                return ret;
1378
1379        if (mf.width > 2560 || mf.height > 1920)
1380                return -EINVAL;
1381
1382        /* Cache camera output window */
1383        cam->width      = mf.width;
1384        cam->height     = mf.height;
1385
1386        /* 4. Calculate camera scales */
1387        scale_cam_h     = calc_generic_scale(cam_rect->width, mf.width);
1388        scale_cam_v     = calc_generic_scale(cam_rect->height, mf.height);
1389
1390        /* Calculate intermediate window */
1391        interm_width    = scale_down(rect->width, scale_cam_h);
1392        interm_height   = scale_down(rect->height, scale_cam_v);
1393
1394        if (pcdev->image_mode) {
1395                out_width       = min(interm_width, icd->user_width);
1396                out_height      = min(interm_height, icd->user_height);
1397        } else {
1398                out_width       = interm_width;
1399                out_height      = interm_height;
1400        }
1401
1402        /*
1403         * 5. Calculate CEU scales from camera scales from results of (5) and
1404         *    the user window
1405         */
1406        scale_ceu_h     = calc_scale(interm_width, &out_width);
1407        scale_ceu_v     = calc_scale(interm_height, &out_height);
1408
1409        /* Calculate camera scales */
1410        scale_h         = calc_generic_scale(cam_rect->width, out_width);
1411        scale_v         = calc_generic_scale(cam_rect->height, out_height);
1412
1413        dev_geo(dev, "5: CEU scales %u:%u\n", scale_ceu_h, scale_ceu_v);
1414
1415        /* Apply CEU scales. */
1416        cflcr = scale_ceu_h | (scale_ceu_v << 16);
1417        if (cflcr != pcdev->cflcr) {
1418                pcdev->cflcr = cflcr;
1419                ceu_write(pcdev, CFLCR, cflcr);
1420        }
1421
1422        icd->user_width  = out_width;
1423        icd->user_height = out_height;
1424        cam->ceu_left    = scale_down(rect->left - cam_rect->left, scale_h) & ~1;
1425        cam->ceu_top     = scale_down(rect->top - cam_rect->top, scale_v) & ~1;
1426
1427        /* 6. Use CEU cropping to crop to the new window. */
1428        sh_mobile_ceu_set_rect(icd);
1429
1430        cam->subrect = *rect;
1431
1432        dev_geo(dev, "6: CEU cropped to %ux%u@%u:%u\n",
1433                icd->user_width, icd->user_height,
1434                cam->ceu_left, cam->ceu_top);
1435
1436        /* Restore capture */
1437        if (pcdev->active)
1438                capsr |= 1;
1439        capture_restore(pcdev, capsr);
1440
1441        /* Even if only camera cropping succeeded */
1442        return ret;
1443}
1444
1445static int sh_mobile_ceu_get_crop(struct soc_camera_device *icd,
1446                                  struct v4l2_crop *a)
1447{
1448        struct sh_mobile_ceu_cam *cam = icd->host_priv;
1449
1450        a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1451        a->c = cam->subrect;
1452
1453        return 0;
1454}
1455
1456/*
1457 * Calculate real client output window by applying new scales to the current
1458 * client crop. New scales are calculated from the requested output format and
1459 * CEU crop, mapped backed onto the client input (subrect).
1460 */
1461static void calculate_client_output(struct soc_camera_device *icd,
1462                struct v4l2_pix_format *pix, struct v4l2_mbus_framefmt *mf)
1463{
1464        struct sh_mobile_ceu_cam *cam = icd->host_priv;
1465        struct device *dev = icd->dev.parent;
1466        struct v4l2_rect *cam_subrect = &cam->subrect;
1467        unsigned int scale_v, scale_h;
1468
1469        if (cam_subrect->width == cam->rect.width &&
1470            cam_subrect->height == cam->rect.height) {
1471                /* No sub-cropping */
1472                mf->width       = pix->width;
1473                mf->height      = pix->height;
1474                return;
1475        }
1476
1477        /* 1.-2. Current camera scales and subwin - cached. */
1478
1479        dev_geo(dev, "2: subwin %ux%u@%u:%u\n",
1480                cam_subrect->width, cam_subrect->height,
1481                cam_subrect->left, cam_subrect->top);
1482
1483        /*
1484         * 3. Calculate new combined scales from input sub-window to requested
1485         *    user window.
1486         */
1487
1488        /*
1489         * TODO: CEU cannot scale images larger than VGA to smaller than SubQCIF
1490         * (128x96) or larger than VGA
1491         */
1492        scale_h = calc_generic_scale(cam_subrect->width, pix->width);
1493        scale_v = calc_generic_scale(cam_subrect->height, pix->height);
1494
1495        dev_geo(dev, "3: scales %u:%u\n", scale_h, scale_v);
1496
1497        /*
1498         * 4. Calculate client output window by applying combined scales to real
1499         *    input window.
1500         */
1501        mf->width       = scale_down(cam->rect.width, scale_h);
1502        mf->height      = scale_down(cam->rect.height, scale_v);
1503}
1504
1505/* Similar to set_crop multistage iterative algorithm */
1506static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
1507                                 struct v4l2_format *f)
1508{
1509        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1510        struct sh_mobile_ceu_dev *pcdev = ici->priv;
1511        struct sh_mobile_ceu_cam *cam = icd->host_priv;
1512        struct v4l2_pix_format *pix = &f->fmt.pix;
1513        struct v4l2_mbus_framefmt mf;
1514        struct device *dev = icd->dev.parent;
1515        __u32 pixfmt = pix->pixelformat;
1516        const struct soc_camera_format_xlate *xlate;
1517        unsigned int ceu_sub_width, ceu_sub_height;
1518        u16 scale_v, scale_h;
1519        int ret;
1520        bool image_mode;
1521        enum v4l2_field field;
1522
1523        dev_geo(dev, "S_FMT(pix=0x%x, %ux%u)\n", pixfmt, pix->width, pix->height);
1524
1525        switch (pix->field) {
1526        default:
1527                pix->field = V4L2_FIELD_NONE;
1528                /* fall-through */
1529        case V4L2_FIELD_INTERLACED_TB:
1530        case V4L2_FIELD_INTERLACED_BT:
1531        case V4L2_FIELD_NONE:
1532                field = pix->field;
1533                break;
1534        case V4L2_FIELD_INTERLACED:
1535                field = V4L2_FIELD_INTERLACED_TB;
1536                break;
1537        }
1538
1539        xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1540        if (!xlate) {
1541                dev_warn(dev, "Format %x not found\n", pixfmt);
1542                return -EINVAL;
1543        }
1544
1545        /* 1.-4. Calculate client output geometry */
1546        calculate_client_output(icd, &f->fmt.pix, &mf);
1547        mf.field        = pix->field;
1548        mf.colorspace   = pix->colorspace;
1549        mf.code         = xlate->code;
1550
1551        switch (pixfmt) {
1552        case V4L2_PIX_FMT_NV12:
1553        case V4L2_PIX_FMT_NV21:
1554        case V4L2_PIX_FMT_NV16:
1555        case V4L2_PIX_FMT_NV61:
1556                image_mode = true;
1557                break;
1558        default:
1559                image_mode = false;
1560        }
1561
1562        dev_geo(dev, "4: request camera output %ux%u\n", mf.width, mf.height);
1563
1564        /* 5. - 9. */
1565        ret = client_scale(icd, &mf, &ceu_sub_width, &ceu_sub_height,
1566                           image_mode && V4L2_FIELD_NONE == field);
1567
1568        dev_geo(dev, "5-9: client scale return %d\n", ret);
1569
1570        /* Done with the camera. Now see if we can improve the result */
1571
1572        dev_geo(dev, "Camera %d fmt %ux%u, requested %ux%u\n",
1573                ret, mf.width, mf.height, pix->width, pix->height);
1574        if (ret < 0)
1575                return ret;
1576
1577        if (mf.code != xlate->code)
1578                return -EINVAL;
1579
1580        /* 9. Prepare CEU crop */
1581        cam->width = mf.width;
1582        cam->height = mf.height;
1583
1584        /* 10. Use CEU scaling to scale to the requested user window. */
1585
1586        /* We cannot scale up */
1587        if (pix->width > ceu_sub_width)
1588                ceu_sub_width = pix->width;
1589
1590        if (pix->height > ceu_sub_height)
1591                ceu_sub_height = pix->height;
1592
1593        pix->colorspace = mf.colorspace;
1594
1595        if (image_mode) {
1596                /* Scale pix->{width x height} down to width x height */
1597                scale_h         = calc_scale(ceu_sub_width, &pix->width);
1598                scale_v         = calc_scale(ceu_sub_height, &pix->height);
1599        } else {
1600                pix->width      = ceu_sub_width;
1601                pix->height     = ceu_sub_height;
1602                scale_h         = 0;
1603                scale_v         = 0;
1604        }
1605
1606        pcdev->cflcr = scale_h | (scale_v << 16);
1607
1608        /*
1609         * We have calculated CFLCR, the actual configuration will be performed
1610         * in sh_mobile_ceu_set_bus_param()
1611         */
1612
1613        dev_geo(dev, "10: W: %u : 0x%x = %u, H: %u : 0x%x = %u\n",
1614                ceu_sub_width, scale_h, pix->width,
1615                ceu_sub_height, scale_v, pix->height);
1616
1617        cam->code               = xlate->code;
1618        icd->current_fmt        = xlate;
1619
1620        pcdev->field = field;
1621        pcdev->image_mode = image_mode;
1622
1623        return 0;
1624}
1625
1626static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
1627                                 struct v4l2_format *f)
1628{
1629        const struct soc_camera_format_xlate *xlate;
1630        struct v4l2_pix_format *pix = &f->fmt.pix;
1631        struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1632        struct v4l2_mbus_framefmt mf;
1633        __u32 pixfmt = pix->pixelformat;
1634        int width, height;
1635        int ret;
1636
1637        xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1638        if (!xlate) {
1639                dev_warn(icd->dev.parent, "Format %x not found\n", pixfmt);
1640                return -EINVAL;
1641        }
1642
1643        /* FIXME: calculate using depth and bus width */
1644
1645        v4l_bound_align_image(&pix->width, 2, 2560, 1,
1646                              &pix->height, 4, 1920, 2, 0);
1647
1648        width = pix->width;
1649        height = pix->height;
1650
1651        pix->bytesperline = soc_mbus_bytes_per_line(width, xlate->host_fmt);
1652        if ((int)pix->bytesperline < 0)
1653                return pix->bytesperline;
1654        pix->sizeimage = height * pix->bytesperline;
1655
1656        /* limit to sensor capabilities */
1657        mf.width        = pix->width;
1658        mf.height       = pix->height;
1659        mf.field        = pix->field;
1660        mf.code         = xlate->code;
1661        mf.colorspace   = pix->colorspace;
1662
1663        ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
1664        if (ret < 0)
1665                return ret;
1666
1667        pix->width      = mf.width;
1668        pix->height     = mf.height;
1669        pix->field      = mf.field;
1670        pix->colorspace = mf.colorspace;
1671
1672        switch (pixfmt) {
1673        case V4L2_PIX_FMT_NV12:
1674        case V4L2_PIX_FMT_NV21:
1675        case V4L2_PIX_FMT_NV16:
1676        case V4L2_PIX_FMT_NV61:
1677                /* FIXME: check against rect_max after converting soc-camera */
1678                /* We can scale precisely, need a bigger image from camera */
1679                if (pix->width < width || pix->height < height) {
1680                        /*
1681                         * We presume, the sensor behaves sanely, i.e., if
1682                         * requested a bigger rectangle, it will not return a
1683                         * smaller one.
1684                         */
1685                        mf.width = 2560;
1686                        mf.height = 1920;
1687                        ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
1688                        if (ret < 0) {
1689                                /* Shouldn't actually happen... */
1690                                dev_err(icd->dev.parent,
1691                                        "FIXME: client try_fmt() = %d\n", ret);
1692                                return ret;
1693                        }
1694                }
1695                /* We will scale exactly */
1696                if (mf.width > width)
1697                        pix->width = width;
1698                if (mf.height > height)
1699                        pix->height = height;
1700        }
1701
1702        return ret;
1703}
1704
1705static int sh_mobile_ceu_reqbufs(struct soc_camera_file *icf,
1706                                 struct v4l2_requestbuffers *p)
1707{
1708        int i;
1709
1710        /*
1711         * This is for locking debugging only. I removed spinlocks and now I
1712         * check whether .prepare is ever called on a linked buffer, or whether
1713         * a dma IRQ can occur for an in-work or unlinked buffer. Until now
1714         * it hadn't triggered
1715         */
1716        for (i = 0; i < p->count; i++) {
1717                struct sh_mobile_ceu_buffer *buf;
1718
1719                buf = container_of(icf->vb_vidq.bufs[i],
1720                                   struct sh_mobile_ceu_buffer, vb);
1721                INIT_LIST_HEAD(&buf->vb.queue);
1722        }
1723
1724        return 0;
1725}
1726
1727static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
1728{
1729        struct soc_camera_file *icf = file->private_data;
1730        struct sh_mobile_ceu_buffer *buf;
1731
1732        buf = list_entry(icf->vb_vidq.stream.next,
1733                         struct sh_mobile_ceu_buffer, vb.stream);
1734
1735        poll_wait(file, &buf->vb.done, pt);
1736
1737        if (buf->vb.state == VIDEOBUF_DONE ||
1738            buf->vb.state == VIDEOBUF_ERROR)
1739                return POLLIN|POLLRDNORM;
1740
1741        return 0;
1742}
1743
1744static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
1745                                  struct v4l2_capability *cap)
1746{
1747        strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
1748        cap->version = KERNEL_VERSION(0, 0, 5);
1749        cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1750        return 0;
1751}
1752
1753static void sh_mobile_ceu_init_videobuf(struct videobuf_queue *q,
1754                                        struct soc_camera_device *icd)
1755{
1756        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1757        struct sh_mobile_ceu_dev *pcdev = ici->priv;
1758
1759        videobuf_queue_dma_contig_init(q,
1760                                       &sh_mobile_ceu_videobuf_ops,
1761                                       icd->dev.parent, &pcdev->lock,
1762                                       V4L2_BUF_TYPE_VIDEO_CAPTURE,
1763                                       pcdev->field,
1764                                       sizeof(struct sh_mobile_ceu_buffer),
1765                                       icd);
1766}
1767
1768static int sh_mobile_ceu_get_parm(struct soc_camera_device *icd,
1769                                  struct v4l2_streamparm *parm)
1770{
1771        struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1772
1773        return v4l2_subdev_call(sd, video, g_parm, parm);
1774}
1775
1776static int sh_mobile_ceu_set_parm(struct soc_camera_device *icd,
1777                                  struct v4l2_streamparm *parm)
1778{
1779        struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1780
1781        return v4l2_subdev_call(sd, video, s_parm, parm);
1782}
1783
1784static int sh_mobile_ceu_get_ctrl(struct soc_camera_device *icd,
1785                                  struct v4l2_control *ctrl)
1786{
1787        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1788        struct sh_mobile_ceu_dev *pcdev = ici->priv;
1789        u32 val;
1790
1791        switch (ctrl->id) {
1792        case V4L2_CID_SHARPNESS:
1793                val = ceu_read(pcdev, CLFCR);
1794                ctrl->value = val ^ 1;
1795                return 0;
1796        }
1797        return -ENOIOCTLCMD;
1798}
1799
1800static int sh_mobile_ceu_set_ctrl(struct soc_camera_device *icd,
1801                                  struct v4l2_control *ctrl)
1802{
1803        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1804        struct sh_mobile_ceu_dev *pcdev = ici->priv;
1805
1806        switch (ctrl->id) {
1807        case V4L2_CID_SHARPNESS:
1808                switch (icd->current_fmt->host_fmt->fourcc) {
1809                case V4L2_PIX_FMT_NV12:
1810                case V4L2_PIX_FMT_NV21:
1811                case V4L2_PIX_FMT_NV16:
1812                case V4L2_PIX_FMT_NV61:
1813                        ceu_write(pcdev, CLFCR, !ctrl->value);
1814                        return 0;
1815                }
1816                return -EINVAL;
1817        }
1818        return -ENOIOCTLCMD;
1819}
1820
1821static const struct v4l2_queryctrl sh_mobile_ceu_controls[] = {
1822        {
1823                .id             = V4L2_CID_SHARPNESS,
1824                .type           = V4L2_CTRL_TYPE_BOOLEAN,
1825                .name           = "Low-pass filter",
1826                .minimum        = 0,
1827                .maximum        = 1,
1828                .step           = 1,
1829                .default_value  = 0,
1830        },
1831};
1832
1833static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
1834        .owner          = THIS_MODULE,
1835        .add            = sh_mobile_ceu_add_device,
1836        .remove         = sh_mobile_ceu_remove_device,
1837        .get_formats    = sh_mobile_ceu_get_formats,
1838        .put_formats    = sh_mobile_ceu_put_formats,
1839        .get_crop       = sh_mobile_ceu_get_crop,
1840        .set_crop       = sh_mobile_ceu_set_crop,
1841        .set_fmt        = sh_mobile_ceu_set_fmt,
1842        .try_fmt        = sh_mobile_ceu_try_fmt,
1843        .set_ctrl       = sh_mobile_ceu_set_ctrl,
1844        .get_ctrl       = sh_mobile_ceu_get_ctrl,
1845        .set_parm       = sh_mobile_ceu_set_parm,
1846        .get_parm       = sh_mobile_ceu_get_parm,
1847        .reqbufs        = sh_mobile_ceu_reqbufs,
1848        .poll           = sh_mobile_ceu_poll,
1849        .querycap       = sh_mobile_ceu_querycap,
1850        .set_bus_param  = sh_mobile_ceu_set_bus_param,
1851        .init_videobuf  = sh_mobile_ceu_init_videobuf,
1852        .controls       = sh_mobile_ceu_controls,
1853        .num_controls   = ARRAY_SIZE(sh_mobile_ceu_controls),
1854};
1855
1856static int __devinit sh_mobile_ceu_probe(struct platform_device *pdev)
1857{
1858        struct sh_mobile_ceu_dev *pcdev;
1859        struct resource *res;
1860        void __iomem *base;
1861        unsigned int irq;
1862        int err = 0;
1863
1864        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1865        irq = platform_get_irq(pdev, 0);
1866        if (!res || (int)irq <= 0) {
1867                dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
1868                err = -ENODEV;
1869                goto exit;
1870        }
1871
1872        pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
1873        if (!pcdev) {
1874                dev_err(&pdev->dev, "Could not allocate pcdev\n");
1875                err = -ENOMEM;
1876                goto exit;
1877        }
1878
1879        INIT_LIST_HEAD(&pcdev->capture);
1880        spin_lock_init(&pcdev->lock);
1881
1882        pcdev->pdata = pdev->dev.platform_data;
1883        if (!pcdev->pdata) {
1884                err = -EINVAL;
1885                dev_err(&pdev->dev, "CEU platform data not set.\n");
1886                goto exit_kfree;
1887        }
1888
1889        base = ioremap_nocache(res->start, resource_size(res));
1890        if (!base) {
1891                err = -ENXIO;
1892                dev_err(&pdev->dev, "Unable to ioremap CEU registers.\n");
1893                goto exit_kfree;
1894        }
1895
1896        pcdev->irq = irq;
1897        pcdev->base = base;
1898        pcdev->video_limit = 0; /* only enabled if second resource exists */
1899
1900        res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1901        if (res) {
1902                err = dma_declare_coherent_memory(&pdev->dev, res->start,
1903                                                  res->start,
1904                                                  resource_size(res),
1905                                                  DMA_MEMORY_MAP |
1906                                                  DMA_MEMORY_EXCLUSIVE);
1907                if (!err) {
1908                        dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
1909                        err = -ENXIO;
1910                        goto exit_iounmap;
1911                }
1912
1913                pcdev->video_limit = resource_size(res);
1914        }
1915
1916        /* request irq */
1917        err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED,
1918                          dev_name(&pdev->dev), pcdev);
1919        if (err) {
1920                dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
1921                goto exit_release_mem;
1922        }
1923
1924        pm_suspend_ignore_children(&pdev->dev, true);
1925        pm_runtime_enable(&pdev->dev);
1926        pm_runtime_resume(&pdev->dev);
1927
1928        pcdev->ici.priv = pcdev;
1929        pcdev->ici.v4l2_dev.dev = &pdev->dev;
1930        pcdev->ici.nr = pdev->id;
1931        pcdev->ici.drv_name = dev_name(&pdev->dev);
1932        pcdev->ici.ops = &sh_mobile_ceu_host_ops;
1933
1934        err = soc_camera_host_register(&pcdev->ici);
1935        if (err)
1936                goto exit_free_clk;
1937
1938        return 0;
1939
1940exit_free_clk:
1941        pm_runtime_disable(&pdev->dev);
1942        free_irq(pcdev->irq, pcdev);
1943exit_release_mem:
1944        if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
1945                dma_release_declared_memory(&pdev->dev);
1946exit_iounmap:
1947        iounmap(base);
1948exit_kfree:
1949        kfree(pcdev);
1950exit:
1951        return err;
1952}
1953
1954static int __devexit sh_mobile_ceu_remove(struct platform_device *pdev)
1955{
1956        struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
1957        struct sh_mobile_ceu_dev *pcdev = container_of(soc_host,
1958                                        struct sh_mobile_ceu_dev, ici);
1959
1960        soc_camera_host_unregister(soc_host);
1961        pm_runtime_disable(&pdev->dev);
1962        free_irq(pcdev->irq, pcdev);
1963        if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
1964                dma_release_declared_memory(&pdev->dev);
1965        iounmap(pcdev->base);
1966        kfree(pcdev);
1967        return 0;
1968}
1969
1970static int sh_mobile_ceu_runtime_nop(struct device *dev)
1971{
1972        /* Runtime PM callback shared between ->runtime_suspend()
1973         * and ->runtime_resume(). Simply returns success.
1974         *
1975         * This driver re-initializes all registers after
1976         * pm_runtime_get_sync() anyway so there is no need
1977         * to save and restore registers here.
1978         */
1979        return 0;
1980}
1981
1982static const struct dev_pm_ops sh_mobile_ceu_dev_pm_ops = {
1983        .runtime_suspend = sh_mobile_ceu_runtime_nop,
1984        .runtime_resume = sh_mobile_ceu_runtime_nop,
1985};
1986
1987static struct platform_driver sh_mobile_ceu_driver = {
1988        .driver         = {
1989                .name   = "sh_mobile_ceu",
1990                .pm     = &sh_mobile_ceu_dev_pm_ops,
1991        },
1992        .probe          = sh_mobile_ceu_probe,
1993        .remove         = __devexit_p(sh_mobile_ceu_remove),
1994};
1995
1996static int __init sh_mobile_ceu_init(void)
1997{
1998        return platform_driver_register(&sh_mobile_ceu_driver);
1999}
2000
2001static void __exit sh_mobile_ceu_exit(void)
2002{
2003        platform_driver_unregister(&sh_mobile_ceu_driver);
2004}
2005
2006module_init(sh_mobile_ceu_init);
2007module_exit(sh_mobile_ceu_exit);
2008
2009MODULE_DESCRIPTION("SuperH Mobile CEU driver");
2010MODULE_AUTHOR("Magnus Damm");
2011MODULE_LICENSE("GPL");
2012MODULE_ALIAS("platform:sh_mobile_ceu");
2013