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                 pcdev->active->state = VIDEOBUF_ACTIVE;
 169                 ceu_write(pcdev, CDAYR, videobuf_to_dma_contig(pcdev->active));
 170                 ceu_write(pcdev, CAPSR, 0x1); /* start capture */
 171         }
 172 }
 173
 174 static int sh_mobile_ceu_videobuf_prepare(struct videobuf_queue *vq,
 175                                           struct videobuf_buffer *vb,
 176                                           enum v4l2_field field)
 177 {
 178         struct soc_camera_device *icd = vq->priv_data;
 179         struct sh_mobile_ceu_buffer *buf;
 180         int ret;
 181
 182         buf = container_of(vb, struct sh_mobile_ceu_buffer, vb);
 183
 184         dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
 185                 vb, vb->baddr, vb->bsize);
 186
 187         /* Added list head initialization on alloc */
 188         WARN_ON(!list_empty(&vb->queue));
 189
 190 #ifdef DEBUG
 191         /* This can be useful if you want to see if we actually fill
 192          * the buffer with something */
 193         memset((void *)vb->baddr, 0xaa, vb->bsize);
 194 #endif
 195
 196         BUG_ON(NULL == icd->current_fmt);
 197
 198         if (buf->fmt    != icd->current_fmt ||
 199             vb->width   != icd->width ||
 200             vb->height  != icd->height ||
 201             vb->field   != field) {
 202                 buf->fmt        = icd->current_fmt;
 203                 vb->width       = icd->width;
 204                 vb->height      = icd->height;
 205                 vb->field       = field;
 206                 vb->state       = VIDEOBUF_NEEDS_INIT;
 207         }
 208
 209         vb->size = vb->width * vb->height * ((buf->fmt->depth + 7) >> 3);
 210         if (0 != vb->baddr && vb->bsize < vb->size) {
 211                 ret = -EINVAL;
 212                 goto out;
 213         }
 214
 215         if (vb->state == VIDEOBUF_NEEDS_INIT) {
 216                 ret = videobuf_iolock(vq, vb, NULL);
 217                 if (ret)
 218                         goto fail;
 219                 vb->state = VIDEOBUF_PREPARED;
 220         }
 221
 222         return 0;
 223 fail:
 224         free_buffer(vq, buf);
 225 out:
 226         return ret;
 227 }
 228
 229 static void sh_mobile_ceu_videobuf_queue(struct videobuf_queue *vq,
 230                                          struct videobuf_buffer *vb)
 231 {
 232         struct soc_camera_device *icd = vq->priv_data;
 233         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 234         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 235         unsigned long flags;
 236
 237         dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
 238                 vb, vb->baddr, vb->bsize);
 239
 240         vb->state = VIDEOBUF_QUEUED;
 241         spin_lock_irqsave(&pcdev->lock, flags);
 242         list_add_tail(&vb->queue, &pcdev->capture);
 243
 244         if (!pcdev->active) {
 245                 pcdev->active = vb;
 246                 sh_mobile_ceu_capture(pcdev);
 247         }
 248
 249         spin_unlock_irqrestore(&pcdev->lock, flags);
 250 }
 251
 252 static void sh_mobile_ceu_videobuf_release(struct videobuf_queue *vq,
 253                                            struct videobuf_buffer *vb)
 254 {
 255         free_buffer(vq, container_of(vb, struct sh_mobile_ceu_buffer, vb));
 256 }
 257
 258 static struct videobuf_queue_ops sh_mobile_ceu_videobuf_ops = {
 259         .buf_setup      = sh_mobile_ceu_videobuf_setup,
 260         .buf_prepare    = sh_mobile_ceu_videobuf_prepare,
 261         .buf_queue      = sh_mobile_ceu_videobuf_queue,
 262         .buf_release    = sh_mobile_ceu_videobuf_release,
 263 };
 264
 265 static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
 266 {
 267         struct sh_mobile_ceu_dev *pcdev = data;
 268         struct videobuf_buffer *vb;
 269         unsigned long flags;
 270
 271         spin_lock_irqsave(&pcdev->lock, flags);
 272
 273         vb = pcdev->active;
 274         list_del_init(&vb->queue);
 275
 276         if (!list_empty(&pcdev->capture))
 277                 pcdev->active = list_entry(pcdev->capture.next,
 278                                            struct videobuf_buffer, queue);
 279         else
 280                 pcdev->active = NULL;
 281
 282         sh_mobile_ceu_capture(pcdev);
 283
 284         vb->state = VIDEOBUF_DONE;
 285         do_gettimeofday(&vb->ts);
 286         vb->field_count++;
 287         wake_up(&vb->done);
 288         spin_unlock_irqrestore(&pcdev->lock, flags);
 289
 290         return IRQ_HANDLED;
 291 }
 292
 293 static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
 294 {
 295         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 296         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 297         int ret = -EBUSY;
 298
 299         mutex_lock(&camera_lock);
 300
 301         if (pcdev->icd)
 302                 goto err;
 303
 304         dev_info(&icd->dev,
 305                  "SuperH Mobile CEU driver attached to camera %d\n",
 306                  icd->devnum);
 307
 308         ret = icd->ops->init(icd);
 309         if (ret)
 310                 goto err;
 311
 312         ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
 313         while (ceu_read(pcdev, CSTSR) & 1)
 314                 msleep(1);
 315
 316         pcdev->icd = icd;
 317 err:
 318         mutex_unlock(&camera_lock);
 319
 320         return ret;
 321 }
 322
 323 static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
 324 {
 325         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 326         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 327         unsigned long flags;
 328
 329         BUG_ON(icd != pcdev->icd);
 330
 331         /* disable capture, disable interrupts */
 332         ceu_write(pcdev, CEIER, 0);
 333         ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
 334
 335         /* make sure active buffer is canceled */
 336         spin_lock_irqsave(&pcdev->lock, flags);
 337         if (pcdev->active) {
 338                 list_del(&pcdev->active->queue);
 339                 pcdev->active->state = VIDEOBUF_ERROR;
 340                 wake_up_all(&pcdev->active->done);
 341                 pcdev->active = NULL;
 342         }
 343         spin_unlock_irqrestore(&pcdev->lock, flags);
 344
 345         icd->ops->release(icd);
 346
 347         dev_info(&icd->dev,
 348                  "SuperH Mobile CEU driver detached from camera %d\n",
 349                  icd->devnum);
 350
 351         pcdev->icd = NULL;
 352 }
 353
 354 static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
 355                                        __u32 pixfmt)
 356 {
 357         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 358         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 359         int ret, buswidth, width, cfszr_width, cdwdr_width;
 360         unsigned long camera_flags, common_flags, value;
 361
 362         camera_flags = icd->ops->query_bus_param(icd);
 363         common_flags = soc_camera_bus_param_compatible(camera_flags,
 364                                                        pcdev->pdata->flags);
 365         if (!common_flags)
 366                 return -EINVAL;
 367
 368         ret = icd->ops->set_bus_param(icd, common_flags);
 369         if (ret < 0)
 370                 return ret;
 371
 372         switch (common_flags & SOCAM_DATAWIDTH_MASK) {
 373         case SOCAM_DATAWIDTH_8:
 374                 buswidth = 8;
 375                 break;
 376         case SOCAM_DATAWIDTH_16:
 377                 buswidth = 16;
 378                 break;
 379         default:
 380                 return -EINVAL;
 381         }
 382
 383         ceu_write(pcdev, CRCNTR, 0);
 384         ceu_write(pcdev, CRCMPR, 0);
 385
 386         value = 0x00000010;
 387         value |= (common_flags & SOCAM_VSYNC_ACTIVE_LOW) ? (1 << 1) : 0;
 388         value |= (common_flags & SOCAM_HSYNC_ACTIVE_LOW) ? (1 << 0) : 0;
 389         value |= (buswidth == 16) ? (1 << 12) : 0;
 390         ceu_write(pcdev, CAMCR, value);
 391
 392         ceu_write(pcdev, CAPCR, 0x00300000);
 393         ceu_write(pcdev, CAIFR, 0);
 394
 395         mdelay(1);
 396
 397         width = icd->width * (icd->current_fmt->depth / 8);
 398         width = (buswidth == 16) ? width / 2 : width;
 399         cfszr_width = (buswidth == 8) ? width / 2 : width;
 400         cdwdr_width = (buswidth == 16) ? width * 2 : width;
 401
 402         ceu_write(pcdev, CAMOR, 0);
 403         ceu_write(pcdev, CAPWR, (icd->height << 16) | width);
 404         ceu_write(pcdev, CFLCR, 0); /* data fetch mode - no scaling */
 405         ceu_write(pcdev, CFSZR, (icd->height << 16) | cfszr_width);
 406         ceu_write(pcdev, CLFCR, 0); /* data fetch mode - no lowpass filter */
 407
 408         /* A few words about byte order (observed in Big Endian mode)
 409          *
 410          * In data fetch mode bytes are received in chunks of 8 bytes.
 411          * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
 412          *
 413          * The data is however by default written to memory in reverse order:
 414          * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
 415          *
 416          * The lowest three bits of CDOCR allows us to do swapping,
 417          * using 7 we swap the data bytes to match the incoming order:
 418          * D0, D1, D2, D3, D4, D5, D6, D7
 419          */
 420         ceu_write(pcdev, CDOCR, 0x00000017);
 421
 422         ceu_write(pcdev, CDWDR, cdwdr_width);
 423         ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
 424
 425         /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
 426         /* in data fetch mode: no need for CDACR, CDBYR, CDBCR */
 427
 428         return 0;
 429 }
 430
 431 static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd,
 432                                        __u32 pixfmt)
 433 {
 434         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 435         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 436         unsigned long camera_flags, common_flags;
 437
 438         camera_flags = icd->ops->query_bus_param(icd);
 439         common_flags = soc_camera_bus_param_compatible(camera_flags,
 440                                                        pcdev->pdata->flags);
 441         if (!common_flags)
 442                 return -EINVAL;
 443
 444         return 0;
 445 }
 446
 447 static int sh_mobile_ceu_set_fmt_cap(struct soc_camera_device *icd,
 448                                      __u32 pixfmt, struct v4l2_rect *rect)
 449 {
 450         return icd->ops->set_fmt_cap(icd, pixfmt, rect);
 451 }
 452
 453 static int sh_mobile_ceu_try_fmt_cap(struct soc_camera_device *icd,
 454                                      struct v4l2_format *f)
 455 {
 456         /* FIXME: calculate using depth and bus width */
 457
 458         if (f->fmt.pix.height < 4)
 459                 f->fmt.pix.height = 4;
 460         if (f->fmt.pix.height > 1920)
 461                 f->fmt.pix.height = 1920;
 462         if (f->fmt.pix.width < 2)
 463                 f->fmt.pix.width = 2;
 464         if (f->fmt.pix.width > 2560)
 465                 f->fmt.pix.width = 2560;
 466         f->fmt.pix.width &= ~0x01;
 467         f->fmt.pix.height &= ~0x03;
 468
 469         /* limit to sensor capabilities */
 470         return icd->ops->try_fmt_cap(icd, f);
 471 }
 472
 473 static int sh_mobile_ceu_reqbufs(struct soc_camera_file *icf,
 474                                  struct v4l2_requestbuffers *p)
 475 {
 476         int i;
 477
 478         /* This is for locking debugging only. I removed spinlocks and now I
 479          * check whether .prepare is ever called on a linked buffer, or whether
 480          * a dma IRQ can occur for an in-work or unlinked buffer. Until now
 481          * it hadn't triggered */
 482         for (i = 0; i < p->count; i++) {
 483                 struct sh_mobile_ceu_buffer *buf;
 484
 485                 buf = container_of(icf->vb_vidq.bufs[i],
 486                                    struct sh_mobile_ceu_buffer, vb);
 487                 INIT_LIST_HEAD(&buf->vb.queue);
 488         }
 489
 490         return 0;
 491 }
 492
 493 static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
 494 {
 495         struct soc_camera_file *icf = file->private_data;
 496         struct sh_mobile_ceu_buffer *buf;
 497
 498         buf = list_entry(icf->vb_vidq.stream.next,
 499                          struct sh_mobile_ceu_buffer, vb.stream);
 500
 501         poll_wait(file, &buf->vb.done, pt);
 502
 503         if (buf->vb.state == VIDEOBUF_DONE ||
 504             buf->vb.state == VIDEOBUF_ERROR)
 505                 return POLLIN|POLLRDNORM;
 506
 507         return 0;
 508 }
 509
 510 static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
 511                                   struct v4l2_capability *cap)
 512 {
 513         strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
 514         cap->version = KERNEL_VERSION(0, 0, 5);
 515         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
 516         return 0;
 517 }
 518
 519 static void sh_mobile_ceu_init_videobuf(struct videobuf_queue *q,
 520                                         struct soc_camera_device *icd)
 521 {
 522         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 523         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 524
 525         videobuf_queue_dma_contig_init(q,
 526                                        &sh_mobile_ceu_videobuf_ops,
 527                                        &ici->dev, &pcdev->lock,
 528                                        V4L2_BUF_TYPE_VIDEO_CAPTURE,
 529                                        V4L2_FIELD_NONE,
 530                                        sizeof(struct sh_mobile_ceu_buffer),
 531                                        icd);
 532 }
 533
 534 static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
 535         .owner          = THIS_MODULE,
 536         .add            = sh_mobile_ceu_add_device,
 537         .remove         = sh_mobile_ceu_remove_device,
 538         .set_fmt_cap    = sh_mobile_ceu_set_fmt_cap,
 539         .try_fmt_cap    = sh_mobile_ceu_try_fmt_cap,
 540         .reqbufs        = sh_mobile_ceu_reqbufs,
 541         .poll           = sh_mobile_ceu_poll,
 542         .querycap       = sh_mobile_ceu_querycap,
 543         .try_bus_param  = sh_mobile_ceu_try_bus_param,
 544         .set_bus_param  = sh_mobile_ceu_set_bus_param,
 545         .init_videobuf  = sh_mobile_ceu_init_videobuf,
 546 };
 547
 548 static int sh_mobile_ceu_probe(struct platform_device *pdev)
 549 {
 550         struct sh_mobile_ceu_dev *pcdev;
 551         struct resource *res;
 552         void __iomem *base;
 553         unsigned int irq;
 554         int err = 0;
 555
 556         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 557         irq = platform_get_irq(pdev, 0);
 558         if (!res || !irq) {
 559                 dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
 560                 err = -ENODEV;
 561                 goto exit;
 562         }
 563
 564         pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
 565         if (!pcdev) {
 566                 dev_err(&pdev->dev, "Could not allocate pcdev\n");
 567                 err = -ENOMEM;
 568                 goto exit;
 569         }
 570
 571         platform_set_drvdata(pdev, pcdev);
 572         INIT_LIST_HEAD(&pcdev->capture);
 573         spin_lock_init(&pcdev->lock);
 574
 575         pcdev->pdata = pdev->dev.platform_data;
 576         if (!pcdev->pdata) {
 577                 err = -EINVAL;
 578                 dev_err(&pdev->dev, "CEU platform data not set.\n");
 579                 goto exit_kfree;
 580         }
 581
 582         base = ioremap_nocache(res->start, res->end - res->start + 1);
 583         if (!base) {
 584                 err = -ENXIO;
 585                 dev_err(&pdev->dev, "Unable to ioremap CEU registers.\n");
 586                 goto exit_kfree;
 587         }
 588
 589         pcdev->irq = irq;
 590         pcdev->base = base;
 591         pcdev->video_limit = 0; /* only enabled if second resource exists */
 592         pcdev->dev = &pdev->dev;
 593
 594         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 595         if (res) {
 596                 err = dma_declare_coherent_memory(&pdev->dev, res->start,
 597                                                   res->start,
 598                                                   (res->end - res->start) + 1,
 599                                                   DMA_MEMORY_MAP |
 600                                                   DMA_MEMORY_EXCLUSIVE);
 601                 if (!err) {
 602                         dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
 603                         err = -ENXIO;
 604                         goto exit_iounmap;
 605                 }
 606
 607                 pcdev->video_limit = (res->end - res->start) + 1;
 608         }
 609
 610         /* request irq */
 611         err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED,
 612                           pdev->dev.bus_id, pcdev);
 613         if (err) {
 614                 dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
 615                 goto exit_release_mem;
 616         }
 617
 618         pcdev->ici.priv = pcdev;
 619         pcdev->ici.dev.parent = &pdev->dev;
 620         pcdev->ici.nr = pdev->id;
 621         pcdev->ici.drv_name = pdev->dev.bus_id,
 622         pcdev->ici.ops = &sh_mobile_ceu_host_ops,
 623
 624         err = soc_camera_host_register(&pcdev->ici);
 625         if (err)
 626                 goto exit_free_irq;
 627
 628         return 0;
 629
 630 exit_free_irq:
 631         free_irq(pcdev->irq, pcdev);
 632 exit_release_mem:
 633         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
 634                 dma_release_declared_memory(&pdev->dev);
 635 exit_iounmap:
 636         iounmap(base);
 637 exit_kfree:
 638         kfree(pcdev);
 639 exit:
 640         return err;
 641 }
 642
 643 static int sh_mobile_ceu_remove(struct platform_device *pdev)
 644 {
 645         struct sh_mobile_ceu_dev *pcdev = platform_get_drvdata(pdev);
 646
 647         soc_camera_host_unregister(&pcdev->ici);
 648         free_irq(pcdev->irq, pcdev);
 649         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
 650                 dma_release_declared_memory(&pdev->dev);
 651         iounmap(pcdev->base);
 652         kfree(pcdev);
 653         return 0;
 654 }
 655
 656 static struct platform_driver sh_mobile_ceu_driver = {
 657         .driver         = {
 658                 .name   = "sh_mobile_ceu",
 659         },
 660         .probe          = sh_mobile_ceu_probe,
 661         .remove         = sh_mobile_ceu_remove,
 662 };
 663
 664 static int __init sh_mobile_ceu_init(void)
 665 {
 666         return platform_driver_register(&sh_mobile_ceu_driver);
 667 }
 668
 669 static void __exit sh_mobile_ceu_exit(void)
 670 {
 671         platform_driver_unregister(&sh_mobile_ceu_driver);
 672 }
 673
 674 module_init(sh_mobile_ceu_init);
 675 module_exit(sh_mobile_ceu_exit);
 676
 677 MODULE_DESCRIPTION("SuperH Mobile CEU driver");
 678 MODULE_AUTHOR("Magnus Damm");
 679 MODULE_LICENSE("GPL");