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