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/device.h>
  31 #include <linux/platform_device.h>
  32 #include <linux/mutex.h>
  33 #include <linux/videodev2.h>
  34 #include <linux/clk.h>
  35
  36 #include <media/v4l2-common.h>
  37 #include <media/v4l2-dev.h>
  38 #include <media/soc_camera.h>
  39 #include <media/sh_mobile_ceu.h>
  40 #include <media/videobuf-dma-contig.h>
  41
  42 /* register offsets for sh7722 / sh7723 */
  43
  44 #define CAPSR  0x00 /* Capture start register */
  45 #define CAPCR  0x04 /* Capture control register */
  46 #define CAMCR  0x08 /* Capture interface control register */
  47 #define CMCYR  0x0c /* Capture interface cycle  register */
  48 #define CAMOR  0x10 /* Capture interface offset register */
  49 #define CAPWR  0x14 /* Capture interface width register */
  50 #define CAIFR  0x18 /* Capture interface input format register */
  51 #define CSTCR  0x20 /* Camera strobe control register (<= sh7722) */
  52 #define CSECR  0x24 /* Camera strobe emission count register (<= sh7722) */
  53 #define CRCNTR 0x28 /* CEU register control register */
  54 #define CRCMPR 0x2c /* CEU register forcible control register */
  55 #define CFLCR  0x30 /* Capture filter control register */
  56 #define CFSZR  0x34 /* Capture filter size clip register */
  57 #define CDWDR  0x38 /* Capture destination width register */
  58 #define CDAYR  0x3c /* Capture data address Y register */
  59 #define CDACR  0x40 /* Capture data address C register */
  60 #define CDBYR  0x44 /* Capture data bottom-field address Y register */
  61 #define CDBCR  0x48 /* Capture data bottom-field address C register */
  62 #define CBDSR  0x4c /* Capture bundle destination size register */
  63 #define CFWCR  0x5c /* Firewall operation control register */
  64 #define CLFCR  0x60 /* Capture low-pass filter control register */
  65 #define CDOCR  0x64 /* Capture data output control register */
  66 #define CDDCR  0x68 /* Capture data complexity level register */
  67 #define CDDAR  0x6c /* Capture data complexity level address register */
  68 #define CEIER  0x70 /* Capture event interrupt enable register */
  69 #define CETCR  0x74 /* Capture event flag clear register */
  70 #define CSTSR  0x7c /* Capture status register */
  71 #define CSRTR  0x80 /* Capture software reset register */
  72 #define CDSSR  0x84 /* Capture data size register */
  73 #define CDAYR2 0x90 /* Capture data address Y register 2 */
  74 #define CDACR2 0x94 /* Capture data address C register 2 */
  75 #define CDBYR2 0x98 /* Capture data bottom-field address Y register 2 */
  76 #define CDBCR2 0x9c /* Capture data bottom-field address C register 2 */
  77
  78 static DEFINE_MUTEX(camera_lock);
  79
  80 /* per video frame buffer */
  81 struct sh_mobile_ceu_buffer {
  82         struct videobuf_buffer vb; /* v4l buffer must be first */
  83         const struct soc_camera_data_format *fmt;
  84 };
  85
  86 struct sh_mobile_ceu_dev {
  87         struct device *dev;
  88         struct soc_camera_host ici;
  89         struct soc_camera_device *icd;
  90
  91         unsigned int irq;
  92         void __iomem *base;
  93         struct clk *clk;
  94         unsigned long video_limit;
  95
  96         /* lock used to protect videobuf */
  97         spinlock_t lock;
  98         struct list_head capture;
  99         struct videobuf_buffer *active;
 100
 101         struct sh_mobile_ceu_info *pdata;
 102 };
 103
 104 static void ceu_write(struct sh_mobile_ceu_dev *priv,
 105                       unsigned long reg_offs, unsigned long data)
 106 {
 107         iowrite32(data, priv->base + reg_offs);
 108 }
 109
 110 static unsigned long ceu_read(struct sh_mobile_ceu_dev *priv,
 111                               unsigned long reg_offs)
 112 {
 113         return ioread32(priv->base + reg_offs);
 114 }
 115
 116 /*
 117  *  Videobuf operations
 118  */
 119 static int sh_mobile_ceu_videobuf_setup(struct videobuf_queue *vq,
 120                                         unsigned int *count,
 121                                         unsigned int *size)
 122 {
 123         struct soc_camera_device *icd = vq->priv_data;
 124         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 125         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 126         int bytes_per_pixel = (icd->current_fmt->depth + 7) >> 3;
 127
 128         *size = PAGE_ALIGN(icd->width * icd->height * bytes_per_pixel);
 129
 130         if (0 == *count)
 131                 *count = 2;
 132
 133         if (pcdev->video_limit) {
 134                 while (*size * *count > pcdev->video_limit)
 135                         (*count)--;
 136         }
 137
 138         dev_dbg(&icd->dev, "count=%d, size=%d\n", *count, *size);
 139
 140         return 0;
 141 }
 142
 143 static void free_buffer(struct videobuf_queue *vq,
 144                         struct sh_mobile_ceu_buffer *buf)
 145 {
 146         struct soc_camera_device *icd = vq->priv_data;
 147
 148         dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
 149                 &buf->vb, buf->vb.baddr, buf->vb.bsize);
 150
 151         if (in_interrupt())
 152                 BUG();
 153
 154         videobuf_dma_contig_free(vq, &buf->vb);
 155         dev_dbg(&icd->dev, "%s freed\n", __func__);
 156         buf->vb.state = VIDEOBUF_NEEDS_INIT;
 157 }
 158
 159 static void sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
 160 {
 161         ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~1);
 162         ceu_write(pcdev, CETCR, ~ceu_read(pcdev, CETCR) & 0x0317f313);
 163         ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | 1);
 164
 165         ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~0x10000);
 166
 167         ceu_write(pcdev, CETCR, 0x0317f313 ^ 0x10);
 168
 169         if (pcdev->active) {
 170                 pcdev->active->state = VIDEOBUF_ACTIVE;
 171                 ceu_write(pcdev, CDAYR, videobuf_to_dma_contig(pcdev->active));
 172                 ceu_write(pcdev, CAPSR, 0x1); /* start capture */
 173         }
 174 }
 175
 176 static int sh_mobile_ceu_videobuf_prepare(struct videobuf_queue *vq,
 177                                           struct videobuf_buffer *vb,
 178                                           enum v4l2_field field)
 179 {
 180         struct soc_camera_device *icd = vq->priv_data;
 181         struct sh_mobile_ceu_buffer *buf;
 182         int ret;
 183
 184         buf = container_of(vb, struct sh_mobile_ceu_buffer, vb);
 185
 186         dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
 187                 vb, vb->baddr, vb->bsize);
 188
 189         /* Added list head initialization on alloc */
 190         WARN_ON(!list_empty(&vb->queue));
 191
 192 #ifdef DEBUG
 193         /* This can be useful if you want to see if we actually fill
 194          * the buffer with something */
 195         memset((void *)vb->baddr, 0xaa, vb->bsize);
 196 #endif
 197
 198         BUG_ON(NULL == icd->current_fmt);
 199
 200         if (buf->fmt    != icd->current_fmt ||
 201             vb->width   != icd->width ||
 202             vb->height  != icd->height ||
 203             vb->field   != field) {
 204                 buf->fmt        = icd->current_fmt;
 205                 vb->width       = icd->width;
 206                 vb->height      = icd->height;
 207                 vb->field       = field;
 208                 vb->state       = VIDEOBUF_NEEDS_INIT;
 209         }
 210
 211         vb->size = vb->width * vb->height * ((buf->fmt->depth + 7) >> 3);
 212         if (0 != vb->baddr && vb->bsize < vb->size) {
 213                 ret = -EINVAL;
 214                 goto out;
 215         }
 216
 217         if (vb->state == VIDEOBUF_NEEDS_INIT) {
 218                 ret = videobuf_iolock(vq, vb, NULL);
 219                 if (ret)
 220                         goto fail;
 221                 vb->state = VIDEOBUF_PREPARED;
 222         }
 223
 224         return 0;
 225 fail:
 226         free_buffer(vq, buf);
 227 out:
 228         return ret;
 229 }
 230
 231 static void sh_mobile_ceu_videobuf_queue(struct videobuf_queue *vq,
 232                                          struct videobuf_buffer *vb)
 233 {
 234         struct soc_camera_device *icd = vq->priv_data;
 235         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 236         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 237         unsigned long flags;
 238
 239         dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
 240                 vb, vb->baddr, vb->bsize);
 241
 242         vb->state = VIDEOBUF_QUEUED;
 243         spin_lock_irqsave(&pcdev->lock, flags);
 244         list_add_tail(&vb->queue, &pcdev->capture);
 245
 246         if (!pcdev->active) {
 247                 pcdev->active = vb;
 248                 sh_mobile_ceu_capture(pcdev);
 249         }
 250
 251         spin_unlock_irqrestore(&pcdev->lock, flags);
 252 }
 253
 254 static void sh_mobile_ceu_videobuf_release(struct videobuf_queue *vq,
 255                                            struct videobuf_buffer *vb)
 256 {
 257         free_buffer(vq, container_of(vb, struct sh_mobile_ceu_buffer, vb));
 258 }
 259
 260 static struct videobuf_queue_ops sh_mobile_ceu_videobuf_ops = {
 261         .buf_setup      = sh_mobile_ceu_videobuf_setup,
 262         .buf_prepare    = sh_mobile_ceu_videobuf_prepare,
 263         .buf_queue      = sh_mobile_ceu_videobuf_queue,
 264         .buf_release    = sh_mobile_ceu_videobuf_release,
 265 };
 266
 267 static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
 268 {
 269         struct sh_mobile_ceu_dev *pcdev = data;
 270         struct videobuf_buffer *vb;
 271         unsigned long flags;
 272
 273         spin_lock_irqsave(&pcdev->lock, flags);
 274
 275         vb = pcdev->active;
 276         list_del_init(&vb->queue);
 277
 278         if (!list_empty(&pcdev->capture))
 279                 pcdev->active = list_entry(pcdev->capture.next,
 280                                            struct videobuf_buffer, queue);
 281         else
 282                 pcdev->active = NULL;
 283
 284         sh_mobile_ceu_capture(pcdev);
 285
 286         vb->state = VIDEOBUF_DONE;
 287         do_gettimeofday(&vb->ts);
 288         vb->field_count++;
 289         wake_up(&vb->done);
 290         spin_unlock_irqrestore(&pcdev->lock, flags);
 291
 292         return IRQ_HANDLED;
 293 }
 294
 295 static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
 296 {
 297         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 298         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 299         int ret = -EBUSY;
 300
 301         mutex_lock(&camera_lock);
 302
 303         if (pcdev->icd)
 304                 goto err;
 305
 306         dev_info(&icd->dev,
 307                  "SuperH Mobile CEU driver attached to camera %d\n",
 308                  icd->devnum);
 309
 310         ret = icd->ops->init(icd);
 311         if (ret)
 312                 goto err;
 313
 314         clk_enable(pcdev->clk);
 315
 316         ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
 317         while (ceu_read(pcdev, CSTSR) & 1)
 318                 msleep(1);
 319
 320         pcdev->icd = icd;
 321 err:
 322         mutex_unlock(&camera_lock);
 323
 324         return ret;
 325 }
 326
 327 static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
 328 {
 329         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 330         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 331         unsigned long flags;
 332
 333         BUG_ON(icd != pcdev->icd);
 334
 335         /* disable capture, disable interrupts */
 336         ceu_write(pcdev, CEIER, 0);
 337         ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
 338
 339         /* make sure active buffer is canceled */
 340         spin_lock_irqsave(&pcdev->lock, flags);
 341         if (pcdev->active) {
 342                 list_del(&pcdev->active->queue);
 343                 pcdev->active->state = VIDEOBUF_ERROR;
 344                 wake_up_all(&pcdev->active->done);
 345                 pcdev->active = NULL;
 346         }
 347         spin_unlock_irqrestore(&pcdev->lock, flags);
 348
 349         clk_disable(pcdev->clk);
 350
 351         icd->ops->release(icd);
 352
 353         dev_info(&icd->dev,
 354                  "SuperH Mobile CEU driver detached from camera %d\n",
 355                  icd->devnum);
 356
 357         pcdev->icd = NULL;
 358 }
 359
 360 static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
 361                                        __u32 pixfmt)
 362 {
 363         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 364         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 365         int ret, buswidth, width, cfszr_width, cdwdr_width;
 366         unsigned long camera_flags, common_flags, value;
 367
 368         camera_flags = icd->ops->query_bus_param(icd);
 369         common_flags = soc_camera_bus_param_compatible(camera_flags,
 370                                                        pcdev->pdata->flags);
 371         if (!common_flags)
 372                 return -EINVAL;
 373
 374         ret = icd->ops->set_bus_param(icd, common_flags);
 375         if (ret < 0)
 376                 return ret;
 377
 378         switch (common_flags & SOCAM_DATAWIDTH_MASK) {
 379         case SOCAM_DATAWIDTH_8:
 380                 buswidth = 8;
 381                 break;
 382         case SOCAM_DATAWIDTH_16:
 383                 buswidth = 16;
 384                 break;
 385         default:
 386                 return -EINVAL;
 387         }
 388
 389         ceu_write(pcdev, CRCNTR, 0);
 390         ceu_write(pcdev, CRCMPR, 0);
 391
 392         value = 0x00000010;
 393         value |= (common_flags & SOCAM_VSYNC_ACTIVE_LOW) ? (1 << 1) : 0;
 394         value |= (common_flags & SOCAM_HSYNC_ACTIVE_LOW) ? (1 << 0) : 0;
 395         value |= (buswidth == 16) ? (1 << 12) : 0;
 396         ceu_write(pcdev, CAMCR, value);
 397
 398         ceu_write(pcdev, CAPCR, 0x00300000);
 399         ceu_write(pcdev, CAIFR, 0);
 400
 401         mdelay(1);
 402
 403         width = icd->width * (icd->current_fmt->depth / 8);
 404         width = (buswidth == 16) ? width / 2 : width;
 405         cfszr_width = (buswidth == 8) ? width / 2 : width;
 406         cdwdr_width = (buswidth == 16) ? width * 2 : width;
 407
 408         ceu_write(pcdev, CAMOR, 0);
 409         ceu_write(pcdev, CAPWR, (icd->height << 16) | width);
 410         ceu_write(pcdev, CFLCR, 0); /* data fetch mode - no scaling */
 411         ceu_write(pcdev, CFSZR, (icd->height << 16) | cfszr_width);
 412         ceu_write(pcdev, CLFCR, 0); /* data fetch mode - no lowpass filter */
 413
 414         /* A few words about byte order (observed in Big Endian mode)
 415          *
 416          * In data fetch mode bytes are received in chunks of 8 bytes.
 417          * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
 418          *
 419          * The data is however by default written to memory in reverse order:
 420          * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
 421          *
 422          * The lowest three bits of CDOCR allows us to do swapping,
 423          * using 7 we swap the data bytes to match the incoming order:
 424          * D0, D1, D2, D3, D4, D5, D6, D7
 425          */
 426         ceu_write(pcdev, CDOCR, 0x00000017);
 427
 428         ceu_write(pcdev, CDWDR, cdwdr_width);
 429         ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
 430
 431         /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
 432         /* in data fetch mode: no need for CDACR, CDBYR, CDBCR */
 433
 434         return 0;
 435 }
 436
 437 static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd)
 438 {
 439         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 440         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 441         unsigned long camera_flags, common_flags;
 442
 443         camera_flags = icd->ops->query_bus_param(icd);
 444         common_flags = soc_camera_bus_param_compatible(camera_flags,
 445                                                        pcdev->pdata->flags);
 446         if (!common_flags)
 447                 return -EINVAL;
 448
 449         return 0;
 450 }
 451
 452 static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, int idx,
 453                                      struct soc_camera_format_xlate *xlate)
 454 {
 455         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 456         int ret;
 457         int formats = 0;
 458
 459         ret = sh_mobile_ceu_try_bus_param(icd);
 460         if (ret < 0)
 461                 return 0;
 462
 463         switch (icd->formats[idx].fourcc) {
 464         default:
 465                 /* Generic pass-through */
 466                 formats++;
 467                 if (xlate) {
 468                         xlate->host_fmt = icd->formats + idx;
 469                         xlate->cam_fmt = icd->formats + idx;
 470                         xlate->buswidth = icd->formats[idx].depth;
 471                         xlate++;
 472                         dev_dbg(&ici->dev,
 473                                 "Providing format %s in pass-through mode\n",
 474                                 icd->formats[idx].name);
 475                 }
 476         }
 477
 478         return formats;
 479 }
 480
 481 static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
 482                                  __u32 pixfmt, struct v4l2_rect *rect)
 483 {
 484         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 485         const struct soc_camera_format_xlate *xlate;
 486         int ret;
 487
 488         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
 489         if (!xlate) {
 490                 dev_warn(&ici->dev, "Format %x not found\n", pixfmt);
 491                 return -EINVAL;
 492         }
 493
 494         switch (pixfmt) {
 495         case 0:                         /* Only geometry change */
 496                 ret = icd->ops->set_fmt(icd, pixfmt, rect);
 497                 break;
 498         default:
 499                 ret = icd->ops->set_fmt(icd, xlate->cam_fmt->fourcc, rect);
 500         }
 501
 502         if (pixfmt && !ret) {
 503                 icd->buswidth = xlate->buswidth;
 504                 icd->current_fmt = xlate->host_fmt;
 505         }
 506
 507         return ret;
 508 }
 509
 510 static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
 511                                  struct v4l2_format *f)
 512 {
 513         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 514         const struct soc_camera_format_xlate *xlate;
 515         __u32 pixfmt = f->fmt.pix.pixelformat;
 516
 517         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
 518         if (!xlate) {
 519                 dev_warn(&ici->dev, "Format %x not found\n", pixfmt);
 520                 return -EINVAL;
 521         }
 522
 523         /* FIXME: calculate using depth and bus width */
 524
 525         if (f->fmt.pix.height < 4)
 526                 f->fmt.pix.height = 4;
 527         if (f->fmt.pix.height > 1920)
 528                 f->fmt.pix.height = 1920;
 529         if (f->fmt.pix.width < 2)
 530                 f->fmt.pix.width = 2;
 531         if (f->fmt.pix.width > 2560)
 532                 f->fmt.pix.width = 2560;
 533         f->fmt.pix.width &= ~0x01;
 534         f->fmt.pix.height &= ~0x03;
 535
 536         f->fmt.pix.bytesperline = f->fmt.pix.width *
 537                 DIV_ROUND_UP(xlate->host_fmt->depth, 8);
 538         f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
 539
 540         /* limit to sensor capabilities */
 541         return icd->ops->try_fmt(icd, f);
 542 }
 543
 544 static int sh_mobile_ceu_reqbufs(struct soc_camera_file *icf,
 545                                  struct v4l2_requestbuffers *p)
 546 {
 547         int i;
 548
 549         /* This is for locking debugging only. I removed spinlocks and now I
 550          * check whether .prepare is ever called on a linked buffer, or whether
 551          * a dma IRQ can occur for an in-work or unlinked buffer. Until now
 552          * it hadn't triggered */
 553         for (i = 0; i < p->count; i++) {
 554                 struct sh_mobile_ceu_buffer *buf;
 555
 556                 buf = container_of(icf->vb_vidq.bufs[i],
 557                                    struct sh_mobile_ceu_buffer, vb);
 558                 INIT_LIST_HEAD(&buf->vb.queue);
 559         }
 560
 561         return 0;
 562 }
 563
 564 static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
 565 {
 566         struct soc_camera_file *icf = file->private_data;
 567         struct sh_mobile_ceu_buffer *buf;
 568
 569         buf = list_entry(icf->vb_vidq.stream.next,
 570                          struct sh_mobile_ceu_buffer, vb.stream);
 571
 572         poll_wait(file, &buf->vb.done, pt);
 573
 574         if (buf->vb.state == VIDEOBUF_DONE ||
 575             buf->vb.state == VIDEOBUF_ERROR)
 576                 return POLLIN|POLLRDNORM;
 577
 578         return 0;
 579 }
 580
 581 static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
 582                                   struct v4l2_capability *cap)
 583 {
 584         strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
 585         cap->version = KERNEL_VERSION(0, 0, 5);
 586         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
 587         return 0;
 588 }
 589
 590 static void sh_mobile_ceu_init_videobuf(struct videobuf_queue *q,
 591                                         struct soc_camera_device *icd)
 592 {
 593         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 594         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 595
 596         videobuf_queue_dma_contig_init(q,
 597                                        &sh_mobile_ceu_videobuf_ops,
 598                                        &ici->dev, &pcdev->lock,
 599                                        V4L2_BUF_TYPE_VIDEO_CAPTURE,
 600                                        V4L2_FIELD_NONE,
 601                                        sizeof(struct sh_mobile_ceu_buffer),
 602                                        icd);
 603 }
 604
 605 static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
 606         .owner          = THIS_MODULE,
 607         .add            = sh_mobile_ceu_add_device,
 608         .remove         = sh_mobile_ceu_remove_device,
 609         .get_formats    = sh_mobile_ceu_get_formats,
 610         .set_fmt        = sh_mobile_ceu_set_fmt,
 611         .try_fmt        = sh_mobile_ceu_try_fmt,
 612         .reqbufs        = sh_mobile_ceu_reqbufs,
 613         .poll           = sh_mobile_ceu_poll,
 614         .querycap       = sh_mobile_ceu_querycap,
 615         .set_bus_param  = sh_mobile_ceu_set_bus_param,
 616         .init_videobuf  = sh_mobile_ceu_init_videobuf,
 617 };
 618
 619 static int sh_mobile_ceu_probe(struct platform_device *pdev)
 620 {
 621         struct sh_mobile_ceu_dev *pcdev;
 622         struct resource *res;
 623         void __iomem *base;
 624         char clk_name[8];
 625         unsigned int irq;
 626         int err = 0;
 627
 628         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 629         irq = platform_get_irq(pdev, 0);
 630         if (!res || !irq) {
 631                 dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
 632                 err = -ENODEV;
 633                 goto exit;
 634         }
 635
 636         pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
 637         if (!pcdev) {
 638                 dev_err(&pdev->dev, "Could not allocate pcdev\n");
 639                 err = -ENOMEM;
 640                 goto exit;
 641         }
 642
 643         platform_set_drvdata(pdev, pcdev);
 644         INIT_LIST_HEAD(&pcdev->capture);
 645         spin_lock_init(&pcdev->lock);
 646
 647         pcdev->pdata = pdev->dev.platform_data;
 648         if (!pcdev->pdata) {
 649                 err = -EINVAL;
 650                 dev_err(&pdev->dev, "CEU platform data not set.\n");
 651                 goto exit_kfree;
 652         }
 653
 654         base = ioremap_nocache(res->start, res->end - res->start + 1);
 655         if (!base) {
 656                 err = -ENXIO;
 657                 dev_err(&pdev->dev, "Unable to ioremap CEU registers.\n");
 658                 goto exit_kfree;
 659         }
 660
 661         pcdev->irq = irq;
 662         pcdev->base = base;
 663         pcdev->video_limit = 0; /* only enabled if second resource exists */
 664         pcdev->dev = &pdev->dev;
 665
 666         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 667         if (res) {
 668                 err = dma_declare_coherent_memory(&pdev->dev, res->start,
 669                                                   res->start,
 670                                                   (res->end - res->start) + 1,
 671                                                   DMA_MEMORY_MAP |
 672                                                   DMA_MEMORY_EXCLUSIVE);
 673                 if (!err) {
 674                         dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
 675                         err = -ENXIO;
 676                         goto exit_iounmap;
 677                 }
 678
 679                 pcdev->video_limit = (res->end - res->start) + 1;
 680         }
 681
 682         /* request irq */
 683         err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED,
 684                           dev_name(&pdev->dev), pcdev);
 685         if (err) {
 686                 dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
 687                 goto exit_release_mem;
 688         }
 689
 690         snprintf(clk_name, sizeof(clk_name), "ceu%d", pdev->id);
 691         pcdev->clk = clk_get(&pdev->dev, clk_name);
 692         if (IS_ERR(pcdev->clk)) {
 693                 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
 694                 err = PTR_ERR(pcdev->clk);
 695                 goto exit_free_irq;
 696         }
 697
 698         pcdev->ici.priv = pcdev;
 699         pcdev->ici.dev.parent = &pdev->dev;
 700         pcdev->ici.nr = pdev->id;
 701         pcdev->ici.drv_name = dev_name(&pdev->dev);
 702         pcdev->ici.ops = &sh_mobile_ceu_host_ops;
 703
 704         err = soc_camera_host_register(&pcdev->ici);
 705         if (err)
 706                 goto exit_free_clk;
 707
 708         return 0;
 709
 710 exit_free_clk:
 711         clk_put(pcdev->clk);
 712 exit_free_irq:
 713         free_irq(pcdev->irq, pcdev);
 714 exit_release_mem:
 715         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
 716                 dma_release_declared_memory(&pdev->dev);
 717 exit_iounmap:
 718         iounmap(base);
 719 exit_kfree:
 720         kfree(pcdev);
 721 exit:
 722         return err;
 723 }
 724
 725 static int sh_mobile_ceu_remove(struct platform_device *pdev)
 726 {
 727         struct sh_mobile_ceu_dev *pcdev = platform_get_drvdata(pdev);
 728
 729         soc_camera_host_unregister(&pcdev->ici);
 730         clk_put(pcdev->clk);
 731         free_irq(pcdev->irq, pcdev);
 732         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
 733                 dma_release_declared_memory(&pdev->dev);
 734         iounmap(pcdev->base);
 735         kfree(pcdev);
 736         return 0;
 737 }
 738
 739 static struct platform_driver sh_mobile_ceu_driver = {
 740         .driver         = {
 741                 .name   = "sh_mobile_ceu",
 742         },
 743         .probe          = sh_mobile_ceu_probe,
 744         .remove         = sh_mobile_ceu_remove,
 745 };
 746
 747 static int __init sh_mobile_ceu_init(void)
 748 {
 749         return platform_driver_register(&sh_mobile_ceu_driver);
 750 }
 751
 752 static void __exit sh_mobile_ceu_exit(void)
 753 {
 754         platform_driver_unregister(&sh_mobile_ceu_driver);
 755 }
 756
 757 module_init(sh_mobile_ceu_init);
 758 module_exit(sh_mobile_ceu_exit);
 759
 760 MODULE_DESCRIPTION("SuperH Mobile CEU driver");
 761 MODULE_AUTHOR("Magnus Damm");
 762 MODULE_LICENSE("GPL");