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/videodev2.h>
  33 #include <linux/pm_runtime.h>
  34 #include <linux/sched.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 #undef DEBUG_GEOMETRY
  79 #ifdef DEBUG_GEOMETRY
  80 #define dev_geo dev_info
  81 #else
  82 #define dev_geo dev_dbg
  83 #endif
  84
  85 /* per video frame buffer */
  86 struct sh_mobile_ceu_buffer {
  87         struct videobuf_buffer vb; /* v4l buffer must be first */
  88         const struct soc_camera_data_format *fmt;
  89 };
  90
  91 struct sh_mobile_ceu_dev {
  92         struct soc_camera_host ici;
  93         struct soc_camera_device *icd;
  94
  95         unsigned int irq;
  96         void __iomem *base;
  97         unsigned long video_limit;
  98
  99         /* lock used to protect videobuf */
 100         spinlock_t lock;
 101         struct list_head capture;
 102         struct videobuf_buffer *active;
 103
 104         struct sh_mobile_ceu_info *pdata;
 105
 106         u32 cflcr;
 107
 108         unsigned int is_interlaced:1;
 109         unsigned int image_mode:1;
 110         unsigned int is_16bit:1;
 111 };
 112
 113 struct sh_mobile_ceu_cam {
 114         struct v4l2_rect ceu_rect;
 115         unsigned int cam_width;
 116         unsigned int cam_height;
 117         const struct soc_camera_data_format *extra_fmt;
 118         const struct soc_camera_data_format *camera_fmt;
 119 };
 120
 121 static unsigned long make_bus_param(struct sh_mobile_ceu_dev *pcdev)
 122 {
 123         unsigned long flags;
 124
 125         flags = SOCAM_MASTER |
 126                 SOCAM_PCLK_SAMPLE_RISING |
 127                 SOCAM_HSYNC_ACTIVE_HIGH |
 128                 SOCAM_HSYNC_ACTIVE_LOW |
 129                 SOCAM_VSYNC_ACTIVE_HIGH |
 130                 SOCAM_VSYNC_ACTIVE_LOW |
 131                 SOCAM_DATA_ACTIVE_HIGH;
 132
 133         if (pcdev->pdata->flags & SH_CEU_FLAG_USE_8BIT_BUS)
 134                 flags |= SOCAM_DATAWIDTH_8;
 135
 136         if (pcdev->pdata->flags & SH_CEU_FLAG_USE_16BIT_BUS)
 137                 flags |= SOCAM_DATAWIDTH_16;
 138
 139         if (flags & SOCAM_DATAWIDTH_MASK)
 140                 return flags;
 141
 142         return 0;
 143 }
 144
 145 static void ceu_write(struct sh_mobile_ceu_dev *priv,
 146                       unsigned long reg_offs, u32 data)
 147 {
 148         iowrite32(data, priv->base + reg_offs);
 149 }
 150
 151 static u32 ceu_read(struct sh_mobile_ceu_dev *priv, unsigned long reg_offs)
 152 {
 153         return ioread32(priv->base + reg_offs);
 154 }
 155
 156 /*
 157  *  Videobuf operations
 158  */
 159 static int sh_mobile_ceu_videobuf_setup(struct videobuf_queue *vq,
 160                                         unsigned int *count,
 161                                         unsigned int *size)
 162 {
 163         struct soc_camera_device *icd = vq->priv_data;
 164         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 165         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 166         int bytes_per_pixel = (icd->current_fmt->depth + 7) >> 3;
 167
 168         *size = PAGE_ALIGN(icd->user_width * icd->user_height *
 169                            bytes_per_pixel);
 170
 171         if (0 == *count)
 172                 *count = 2;
 173
 174         if (pcdev->video_limit) {
 175                 while (*size * *count > pcdev->video_limit)
 176                         (*count)--;
 177         }
 178
 179         dev_dbg(icd->dev.parent, "count=%d, size=%d\n", *count, *size);
 180
 181         return 0;
 182 }
 183
 184 static void free_buffer(struct videobuf_queue *vq,
 185                         struct sh_mobile_ceu_buffer *buf)
 186 {
 187         struct soc_camera_device *icd = vq->priv_data;
 188         struct device *dev = icd->dev.parent;
 189
 190         dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
 191                 &buf->vb, buf->vb.baddr, buf->vb.bsize);
 192
 193         if (in_interrupt())
 194                 BUG();
 195
 196         videobuf_waiton(&buf->vb, 0, 0);
 197         videobuf_dma_contig_free(vq, &buf->vb);
 198         dev_dbg(dev, "%s freed\n", __func__);
 199         buf->vb.state = VIDEOBUF_NEEDS_INIT;
 200 }
 201
 202 #define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */
 203 #define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */
 204 #define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */
 205 #define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */
 206
 207
 208 static void sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
 209 {
 210         struct soc_camera_device *icd = pcdev->icd;
 211         dma_addr_t phys_addr_top, phys_addr_bottom;
 212
 213         /* The hardware is _very_ picky about this sequence. Especially
 214          * the CEU_CETCR_MAGIC value. It seems like we need to acknowledge
 215          * several not-so-well documented interrupt sources in CETCR.
 216          */
 217         ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_CPEIE);
 218         ceu_write(pcdev, CETCR, ~ceu_read(pcdev, CETCR) & CEU_CETCR_MAGIC);
 219         ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_CPEIE);
 220         ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP);
 221         ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW);
 222
 223         if (!pcdev->active)
 224                 return;
 225
 226         phys_addr_top = videobuf_to_dma_contig(pcdev->active);
 227         ceu_write(pcdev, CDAYR, phys_addr_top);
 228         if (pcdev->is_interlaced) {
 229                 phys_addr_bottom = phys_addr_top + icd->user_width;
 230                 ceu_write(pcdev, CDBYR, phys_addr_bottom);
 231         }
 232
 233         switch (icd->current_fmt->fourcc) {
 234         case V4L2_PIX_FMT_NV12:
 235         case V4L2_PIX_FMT_NV21:
 236         case V4L2_PIX_FMT_NV16:
 237         case V4L2_PIX_FMT_NV61:
 238                 phys_addr_top += icd->user_width *
 239                         icd->user_height;
 240                 ceu_write(pcdev, CDACR, phys_addr_top);
 241                 if (pcdev->is_interlaced) {
 242                         phys_addr_bottom = phys_addr_top +
 243                                 icd->user_width;
 244                         ceu_write(pcdev, CDBCR, phys_addr_bottom);
 245                 }
 246         }
 247
 248         pcdev->active->state = VIDEOBUF_ACTIVE;
 249         ceu_write(pcdev, CAPSR, 0x1); /* start capture */
 250 }
 251
 252 static int sh_mobile_ceu_videobuf_prepare(struct videobuf_queue *vq,
 253                                           struct videobuf_buffer *vb,
 254                                           enum v4l2_field field)
 255 {
 256         struct soc_camera_device *icd = vq->priv_data;
 257         struct sh_mobile_ceu_buffer *buf;
 258         int ret;
 259
 260         buf = container_of(vb, struct sh_mobile_ceu_buffer, vb);
 261
 262         dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
 263                 vb, vb->baddr, vb->bsize);
 264
 265         /* Added list head initialization on alloc */
 266         WARN_ON(!list_empty(&vb->queue));
 267
 268 #ifdef DEBUG
 269         /* This can be useful if you want to see if we actually fill
 270          * the buffer with something */
 271         memset((void *)vb->baddr, 0xaa, vb->bsize);
 272 #endif
 273
 274         BUG_ON(NULL == icd->current_fmt);
 275
 276         if (buf->fmt    != icd->current_fmt ||
 277             vb->width   != icd->user_width ||
 278             vb->height  != icd->user_height ||
 279             vb->field   != field) {
 280                 buf->fmt        = icd->current_fmt;
 281                 vb->width       = icd->user_width;
 282                 vb->height      = icd->user_height;
 283                 vb->field       = field;
 284                 vb->state       = VIDEOBUF_NEEDS_INIT;
 285         }
 286
 287         vb->size = vb->width * vb->height * ((buf->fmt->depth + 7) >> 3);
 288         if (0 != vb->baddr && vb->bsize < vb->size) {
 289                 ret = -EINVAL;
 290                 goto out;
 291         }
 292
 293         if (vb->state == VIDEOBUF_NEEDS_INIT) {
 294                 ret = videobuf_iolock(vq, vb, NULL);
 295                 if (ret)
 296                         goto fail;
 297                 vb->state = VIDEOBUF_PREPARED;
 298         }
 299
 300         return 0;
 301 fail:
 302         free_buffer(vq, buf);
 303 out:
 304         return ret;
 305 }
 306
 307 /* Called under spinlock_irqsave(&pcdev->lock, ...) */
 308 static void sh_mobile_ceu_videobuf_queue(struct videobuf_queue *vq,
 309                                          struct videobuf_buffer *vb)
 310 {
 311         struct soc_camera_device *icd = vq->priv_data;
 312         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 313         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 314
 315         dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
 316                 vb, vb->baddr, vb->bsize);
 317
 318         vb->state = VIDEOBUF_QUEUED;
 319         list_add_tail(&vb->queue, &pcdev->capture);
 320
 321         if (!pcdev->active) {
 322                 pcdev->active = vb;
 323                 sh_mobile_ceu_capture(pcdev);
 324         }
 325 }
 326
 327 static void sh_mobile_ceu_videobuf_release(struct videobuf_queue *vq,
 328                                            struct videobuf_buffer *vb)
 329 {
 330         struct soc_camera_device *icd = vq->priv_data;
 331         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 332         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 333         unsigned long flags;
 334
 335         spin_lock_irqsave(&pcdev->lock, flags);
 336
 337         if (pcdev->active == vb) {
 338                 /* disable capture (release DMA buffer), reset */
 339                 ceu_write(pcdev, CAPSR, 1 << 16);
 340                 pcdev->active = NULL;
 341         }
 342
 343         if ((vb->state == VIDEOBUF_ACTIVE || vb->state == VIDEOBUF_QUEUED) &&
 344             !list_empty(&vb->queue)) {
 345                 vb->state = VIDEOBUF_ERROR;
 346                 list_del_init(&vb->queue);
 347         }
 348
 349         spin_unlock_irqrestore(&pcdev->lock, flags);
 350
 351         free_buffer(vq, container_of(vb, struct sh_mobile_ceu_buffer, vb));
 352 }
 353
 354 static struct videobuf_queue_ops sh_mobile_ceu_videobuf_ops = {
 355         .buf_setup      = sh_mobile_ceu_videobuf_setup,
 356         .buf_prepare    = sh_mobile_ceu_videobuf_prepare,
 357         .buf_queue      = sh_mobile_ceu_videobuf_queue,
 358         .buf_release    = sh_mobile_ceu_videobuf_release,
 359 };
 360
 361 static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
 362 {
 363         struct sh_mobile_ceu_dev *pcdev = data;
 364         struct videobuf_buffer *vb;
 365         unsigned long flags;
 366
 367         spin_lock_irqsave(&pcdev->lock, flags);
 368
 369         vb = pcdev->active;
 370         if (!vb)
 371                 /* Stale interrupt from a released buffer */
 372                 goto out;
 373
 374         list_del_init(&vb->queue);
 375
 376         if (!list_empty(&pcdev->capture))
 377                 pcdev->active = list_entry(pcdev->capture.next,
 378                                            struct videobuf_buffer, queue);
 379         else
 380                 pcdev->active = NULL;
 381
 382         sh_mobile_ceu_capture(pcdev);
 383
 384         vb->state = VIDEOBUF_DONE;
 385         do_gettimeofday(&vb->ts);
 386         vb->field_count++;
 387         wake_up(&vb->done);
 388
 389 out:
 390         spin_unlock_irqrestore(&pcdev->lock, flags);
 391
 392         return IRQ_HANDLED;
 393 }
 394
 395 /* Called with .video_lock held */
 396 static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
 397 {
 398         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 399         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 400
 401         if (pcdev->icd)
 402                 return -EBUSY;
 403
 404         dev_info(icd->dev.parent,
 405                  "SuperH Mobile CEU driver attached to camera %d\n",
 406                  icd->devnum);
 407
 408         pm_runtime_get_sync(ici->v4l2_dev.dev);
 409
 410         ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
 411         while (ceu_read(pcdev, CSTSR) & 1)
 412                 msleep(1);
 413
 414         pcdev->icd = icd;
 415
 416         return 0;
 417 }
 418
 419 /* Called with .video_lock held */
 420 static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
 421 {
 422         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 423         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 424         unsigned long flags;
 425
 426         BUG_ON(icd != pcdev->icd);
 427
 428         /* disable capture, disable interrupts */
 429         ceu_write(pcdev, CEIER, 0);
 430         ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
 431
 432         /* make sure active buffer is canceled */
 433         spin_lock_irqsave(&pcdev->lock, flags);
 434         if (pcdev->active) {
 435                 list_del(&pcdev->active->queue);
 436                 pcdev->active->state = VIDEOBUF_ERROR;
 437                 wake_up_all(&pcdev->active->done);
 438                 pcdev->active = NULL;
 439         }
 440         spin_unlock_irqrestore(&pcdev->lock, flags);
 441
 442         pm_runtime_put_sync(ici->v4l2_dev.dev);
 443
 444         dev_info(icd->dev.parent,
 445                  "SuperH Mobile CEU driver detached from camera %d\n",
 446                  icd->devnum);
 447
 448         pcdev->icd = NULL;
 449 }
 450
 451 /*
 452  * See chapter 29.4.12 "Capture Filter Control Register (CFLCR)"
 453  * in SH7722 Hardware Manual
 454  */
 455 static unsigned int size_dst(unsigned int src, unsigned int scale)
 456 {
 457         unsigned int mant_pre = scale >> 12;
 458         if (!src || !scale)
 459                 return src;
 460         return ((mant_pre + 2 * (src - 1)) / (2 * mant_pre) - 1) *
 461                 mant_pre * 4096 / scale + 1;
 462 }
 463
 464 static u16 calc_scale(unsigned int src, unsigned int *dst)
 465 {
 466         u16 scale;
 467
 468         if (src == *dst)
 469                 return 0;
 470
 471         scale = (src * 4096 / *dst) & ~7;
 472
 473         while (scale > 4096 && size_dst(src, scale) < *dst)
 474                 scale -= 8;
 475
 476         *dst = size_dst(src, scale);
 477
 478         return scale;
 479 }
 480
 481 /* rect is guaranteed to not exceed the scaled camera rectangle */
 482 static void sh_mobile_ceu_set_rect(struct soc_camera_device *icd,
 483                                    unsigned int out_width,
 484                                    unsigned int out_height)
 485 {
 486         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 487         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 488         struct v4l2_rect *rect = &cam->ceu_rect;
 489         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 490         unsigned int height, width, cdwdr_width, in_width, in_height;
 491         unsigned int left_offset, top_offset;
 492         u32 camor;
 493
 494         dev_dbg(icd->dev.parent, "Crop %ux%u@%u:%u\n",
 495                 rect->width, rect->height, rect->left, rect->top);
 496
 497         left_offset     = rect->left;
 498         top_offset      = rect->top;
 499
 500         if (pcdev->image_mode) {
 501                 in_width = rect->width;
 502                 if (!pcdev->is_16bit) {
 503                         in_width *= 2;
 504                         left_offset *= 2;
 505                 }
 506                 width = cdwdr_width = out_width;
 507         } else {
 508                 unsigned int w_factor = (icd->current_fmt->depth + 7) >> 3;
 509
 510                 width = out_width * w_factor / 2;
 511
 512                 if (!pcdev->is_16bit)
 513                         w_factor *= 2;
 514
 515                 in_width = rect->width * w_factor / 2;
 516                 left_offset = left_offset * w_factor / 2;
 517
 518                 cdwdr_width = width * 2;
 519         }
 520
 521         height = out_height;
 522         in_height = rect->height;
 523         if (pcdev->is_interlaced) {
 524                 height /= 2;
 525                 in_height /= 2;
 526                 top_offset /= 2;
 527                 cdwdr_width *= 2;
 528         }
 529
 530         /* Set CAMOR, CAPWR, CFSZR, take care of CDWDR */
 531         camor = left_offset | (top_offset << 16);
 532
 533         dev_geo(icd->dev.parent,
 534                 "CAMOR 0x%x, CAPWR 0x%x, CFSZR 0x%x, CDWDR 0x%x\n", camor,
 535                 (in_height << 16) | in_width, (height << 16) | width,
 536                 cdwdr_width);
 537
 538         ceu_write(pcdev, CAMOR, camor);
 539         ceu_write(pcdev, CAPWR, (in_height << 16) | in_width);
 540         ceu_write(pcdev, CFSZR, (height << 16) | width);
 541         ceu_write(pcdev, CDWDR, cdwdr_width);
 542 }
 543
 544 static u32 capture_save_reset(struct sh_mobile_ceu_dev *pcdev)
 545 {
 546         u32 capsr = ceu_read(pcdev, CAPSR);
 547         ceu_write(pcdev, CAPSR, 1 << 16); /* reset, stop capture */
 548         return capsr;
 549 }
 550
 551 static void capture_restore(struct sh_mobile_ceu_dev *pcdev, u32 capsr)
 552 {
 553         unsigned long timeout = jiffies + 10 * HZ;
 554
 555         /*
 556          * Wait until the end of the current frame. It can take a long time,
 557          * but if it has been aborted by a CAPSR reset, it shoule exit sooner.
 558          */
 559         while ((ceu_read(pcdev, CSTSR) & 1) && time_before(jiffies, timeout))
 560                 msleep(1);
 561
 562         if (time_after(jiffies, timeout)) {
 563                 dev_err(pcdev->ici.v4l2_dev.dev,
 564                         "Timeout waiting for frame end! Interface problem?\n");
 565                 return;
 566         }
 567
 568         /* Wait until reset clears, this shall not hang... */
 569         while (ceu_read(pcdev, CAPSR) & (1 << 16))
 570                 udelay(10);
 571
 572         /* Anything to restore? */
 573         if (capsr & ~(1 << 16))
 574                 ceu_write(pcdev, CAPSR, capsr);
 575 }
 576
 577 static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
 578                                        __u32 pixfmt)
 579 {
 580         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 581         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 582         int ret;
 583         unsigned long camera_flags, common_flags, value;
 584         int yuv_lineskip;
 585         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 586         u32 capsr = capture_save_reset(pcdev);
 587
 588         camera_flags = icd->ops->query_bus_param(icd);
 589         common_flags = soc_camera_bus_param_compatible(camera_flags,
 590                                                        make_bus_param(pcdev));
 591         if (!common_flags)
 592                 return -EINVAL;
 593
 594         ret = icd->ops->set_bus_param(icd, common_flags);
 595         if (ret < 0)
 596                 return ret;
 597
 598         switch (common_flags & SOCAM_DATAWIDTH_MASK) {
 599         case SOCAM_DATAWIDTH_8:
 600                 pcdev->is_16bit = 0;
 601                 break;
 602         case SOCAM_DATAWIDTH_16:
 603                 pcdev->is_16bit = 1;
 604                 break;
 605         default:
 606                 return -EINVAL;
 607         }
 608
 609         ceu_write(pcdev, CRCNTR, 0);
 610         ceu_write(pcdev, CRCMPR, 0);
 611
 612         value = 0x00000010; /* data fetch by default */
 613         yuv_lineskip = 0;
 614
 615         switch (icd->current_fmt->fourcc) {
 616         case V4L2_PIX_FMT_NV12:
 617         case V4L2_PIX_FMT_NV21:
 618                 yuv_lineskip = 1; /* skip for NV12/21, no skip for NV16/61 */
 619                 /* fall-through */
 620         case V4L2_PIX_FMT_NV16:
 621         case V4L2_PIX_FMT_NV61:
 622                 switch (cam->camera_fmt->fourcc) {
 623                 case V4L2_PIX_FMT_UYVY:
 624                         value = 0x00000000; /* Cb0, Y0, Cr0, Y1 */
 625                         break;
 626                 case V4L2_PIX_FMT_VYUY:
 627                         value = 0x00000100; /* Cr0, Y0, Cb0, Y1 */
 628                         break;
 629                 case V4L2_PIX_FMT_YUYV:
 630                         value = 0x00000200; /* Y0, Cb0, Y1, Cr0 */
 631                         break;
 632                 case V4L2_PIX_FMT_YVYU:
 633                         value = 0x00000300; /* Y0, Cr0, Y1, Cb0 */
 634                         break;
 635                 default:
 636                         BUG();
 637                 }
 638         }
 639
 640         if (icd->current_fmt->fourcc == V4L2_PIX_FMT_NV21 ||
 641             icd->current_fmt->fourcc == V4L2_PIX_FMT_NV61)
 642                 value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */
 643
 644         value |= common_flags & SOCAM_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
 645         value |= common_flags & SOCAM_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
 646         value |= pcdev->is_16bit ? 1 << 12 : 0;
 647         ceu_write(pcdev, CAMCR, value);
 648
 649         ceu_write(pcdev, CAPCR, 0x00300000);
 650         ceu_write(pcdev, CAIFR, pcdev->is_interlaced ? 0x101 : 0);
 651
 652         sh_mobile_ceu_set_rect(icd, icd->user_width, icd->user_height);
 653         mdelay(1);
 654
 655         ceu_write(pcdev, CFLCR, pcdev->cflcr);
 656
 657         /* A few words about byte order (observed in Big Endian mode)
 658          *
 659          * In data fetch mode bytes are received in chunks of 8 bytes.
 660          * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
 661          *
 662          * The data is however by default written to memory in reverse order:
 663          * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
 664          *
 665          * The lowest three bits of CDOCR allows us to do swapping,
 666          * using 7 we swap the data bytes to match the incoming order:
 667          * D0, D1, D2, D3, D4, D5, D6, D7
 668          */
 669         value = 0x00000017;
 670         if (yuv_lineskip)
 671                 value &= ~0x00000010; /* convert 4:2:2 -> 4:2:0 */
 672
 673         ceu_write(pcdev, CDOCR, value);
 674         ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
 675
 676         dev_dbg(icd->dev.parent, "S_FMT successful for %c%c%c%c %ux%u\n",
 677                 pixfmt & 0xff, (pixfmt >> 8) & 0xff,
 678                 (pixfmt >> 16) & 0xff, (pixfmt >> 24) & 0xff,
 679                 icd->user_width, icd->user_height);
 680
 681         capture_restore(pcdev, capsr);
 682
 683         /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
 684         return 0;
 685 }
 686
 687 static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd)
 688 {
 689         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 690         struct sh_mobile_ceu_dev *pcdev = ici->priv;
 691         unsigned long camera_flags, common_flags;
 692
 693         camera_flags = icd->ops->query_bus_param(icd);
 694         common_flags = soc_camera_bus_param_compatible(camera_flags,
 695                                                        make_bus_param(pcdev));
 696         if (!common_flags)
 697                 return -EINVAL;
 698
 699         return 0;
 700 }
 701
 702 static const struct soc_camera_data_format sh_mobile_ceu_formats[] = {
 703         {
 704                 .name           = "NV12",
 705                 .depth          = 12,
 706                 .fourcc         = V4L2_PIX_FMT_NV12,
 707                 .colorspace     = V4L2_COLORSPACE_JPEG,
 708         },
 709         {
 710                 .name           = "NV21",
 711                 .depth          = 12,
 712                 .fourcc         = V4L2_PIX_FMT_NV21,
 713                 .colorspace     = V4L2_COLORSPACE_JPEG,
 714         },
 715         {
 716                 .name           = "NV16",
 717                 .depth          = 16,
 718                 .fourcc         = V4L2_PIX_FMT_NV16,
 719                 .colorspace     = V4L2_COLORSPACE_JPEG,
 720         },
 721         {
 722                 .name           = "NV61",
 723                 .depth          = 16,
 724                 .fourcc         = V4L2_PIX_FMT_NV61,
 725                 .colorspace     = V4L2_COLORSPACE_JPEG,
 726         },
 727 };
 728
 729 static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, int idx,
 730                                      struct soc_camera_format_xlate *xlate)
 731 {
 732         struct device *dev = icd->dev.parent;
 733         int ret, k, n;
 734         int formats = 0;
 735         struct sh_mobile_ceu_cam *cam;
 736
 737         ret = sh_mobile_ceu_try_bus_param(icd);
 738         if (ret < 0)
 739                 return 0;
 740
 741         if (!icd->host_priv) {
 742                 cam = kzalloc(sizeof(*cam), GFP_KERNEL);
 743                 if (!cam)
 744                         return -ENOMEM;
 745
 746                 icd->host_priv = cam;
 747         } else {
 748                 cam = icd->host_priv;
 749         }
 750
 751         /* Beginning of a pass */
 752         if (!idx)
 753                 cam->extra_fmt = NULL;
 754
 755         switch (icd->formats[idx].fourcc) {
 756         case V4L2_PIX_FMT_UYVY:
 757         case V4L2_PIX_FMT_VYUY:
 758         case V4L2_PIX_FMT_YUYV:
 759         case V4L2_PIX_FMT_YVYU:
 760                 if (cam->extra_fmt)
 761                         goto add_single_format;
 762
 763                 /*
 764                  * Our case is simple so far: for any of the above four camera
 765                  * formats we add all our four synthesized NV* formats, so,
 766                  * just marking the device with a single flag suffices. If
 767                  * the format generation rules are more complex, you would have
 768                  * to actually hang your already added / counted formats onto
 769                  * the host_priv pointer and check whether the format you're
 770                  * going to add now is already there.
 771                  */
 772                 cam->extra_fmt = (void *)sh_mobile_ceu_formats;
 773
 774                 n = ARRAY_SIZE(sh_mobile_ceu_formats);
 775                 formats += n;
 776                 for (k = 0; xlate && k < n; k++) {
 777                         xlate->host_fmt = &sh_mobile_ceu_formats[k];
 778                         xlate->cam_fmt = icd->formats + idx;
 779                         xlate->buswidth = icd->formats[idx].depth;
 780                         xlate++;
 781                         dev_dbg(dev, "Providing format %s using %s\n",
 782                                 sh_mobile_ceu_formats[k].name,
 783                                 icd->formats[idx].name);
 784                 }
 785         default:
 786 add_single_format:
 787                 /* Generic pass-through */
 788                 formats++;
 789                 if (xlate) {
 790                         xlate->host_fmt = icd->formats + idx;
 791                         xlate->cam_fmt = icd->formats + idx;
 792                         xlate->buswidth = icd->formats[idx].depth;
 793                         xlate++;
 794                         dev_dbg(dev,
 795                                 "Providing format %s in pass-through mode\n",
 796                                 icd->formats[idx].name);
 797                 }
 798         }
 799
 800         return formats;
 801 }
 802
 803 static void sh_mobile_ceu_put_formats(struct soc_camera_device *icd)
 804 {
 805         kfree(icd->host_priv);
 806         icd->host_priv = NULL;
 807 }
 808
 809 /* Check if any dimension of r1 is smaller than respective one of r2 */
 810 static bool is_smaller(struct v4l2_rect *r1, struct v4l2_rect *r2)
 811 {
 812         return r1->width < r2->width || r1->height < r2->height;
 813 }
 814
 815 /* Check if r1 fails to cover r2 */
 816 static bool is_inside(struct v4l2_rect *r1, struct v4l2_rect *r2)
 817 {
 818         return r1->left > r2->left || r1->top > r2->top ||
 819                 r1->left + r1->width < r2->left + r2->width ||
 820                 r1->top + r1->height < r2->top + r2->height;
 821 }
 822
 823 static unsigned int scale_down(unsigned int size, unsigned int scale)
 824 {
 825         return (size * 4096 + scale / 2) / scale;
 826 }
 827
 828 static unsigned int scale_up(unsigned int size, unsigned int scale)
 829 {
 830         return (size * scale + 2048) / 4096;
 831 }
 832
 833 static unsigned int calc_generic_scale(unsigned int input, unsigned int output)
 834 {
 835         return (input * 4096 + output / 2) / output;
 836 }
 837
 838 static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect)
 839 {
 840         struct v4l2_crop crop;
 841         struct v4l2_cropcap cap;
 842         int ret;
 843
 844         crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 845
 846         ret = v4l2_subdev_call(sd, video, g_crop, &crop);
 847         if (!ret) {
 848                 *rect = crop.c;
 849                 return ret;
 850         }
 851
 852         /* Camera driver doesn't support .g_crop(), assume default rectangle */
 853         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 854
 855         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
 856         if (ret < 0)
 857                 return ret;
 858
 859         *rect = cap.defrect;
 860
 861         return ret;
 862 }
 863
 864 /*
 865  * The common for both scaling and cropping iterative approach is:
 866  * 1. try if the client can produce exactly what requested by the user
 867  * 2. if (1) failed, try to double the client image until we get one big enough
 868  * 3. if (2) failed, try to request the maximum image
 869  */
 870 static int client_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *crop,
 871                          struct v4l2_crop *cam_crop)
 872 {
 873         struct v4l2_rect *rect = &crop->c, *cam_rect = &cam_crop->c;
 874         struct device *dev = sd->v4l2_dev->dev;
 875         struct v4l2_cropcap cap;
 876         int ret;
 877         unsigned int width, height;
 878
 879         v4l2_subdev_call(sd, video, s_crop, crop);
 880         ret = client_g_rect(sd, cam_rect);
 881         if (ret < 0)
 882                 return ret;
 883
 884         /*
 885          * Now cam_crop contains the current camera input rectangle, and it must
 886          * be within camera cropcap bounds
 887          */
 888         if (!memcmp(rect, cam_rect, sizeof(*rect))) {
 889                 /* Even if camera S_CROP failed, but camera rectangle matches */
 890                 dev_dbg(dev, "Camera S_CROP successful for %ux%u@%u:%u\n",
 891                         rect->width, rect->height, rect->left, rect->top);
 892                 return 0;
 893         }
 894
 895         /* Try to fix cropping, that camera hasn't managed to set */
 896         dev_geo(dev, "Fix camera S_CROP for %ux%u@%u:%u to %ux%u@%u:%u\n",
 897                 cam_rect->width, cam_rect->height,
 898                 cam_rect->left, cam_rect->top,
 899                 rect->width, rect->height, rect->left, rect->top);
 900
 901         /* We need sensor maximum rectangle */
 902         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
 903         if (ret < 0)
 904                 return ret;
 905
 906         soc_camera_limit_side(&rect->left, &rect->width, cap.bounds.left, 2,
 907                               cap.bounds.width);
 908         soc_camera_limit_side(&rect->top, &rect->height, cap.bounds.top, 4,
 909                               cap.bounds.height);
 910
 911         /*
 912          * Popular special case - some cameras can only handle fixed sizes like
 913          * QVGA, VGA,... Take care to avoid infinite loop.
 914          */
 915         width = max(cam_rect->width, 2);
 916         height = max(cam_rect->height, 2);
 917
 918         while (!ret && (is_smaller(cam_rect, rect) ||
 919                         is_inside(cam_rect, rect)) &&
 920                (cap.bounds.width > width || cap.bounds.height > height)) {
 921
 922                 width *= 2;
 923                 height *= 2;
 924
 925                 cam_rect->width = width;
 926                 cam_rect->height = height;
 927
 928                 /*
 929                  * We do not know what capabilities the camera has to set up
 930                  * left and top borders. We could try to be smarter in iterating
 931                  * them, e.g., if camera current left is to the right of the
 932                  * target left, set it to the middle point between the current
 933                  * left and minimum left. But that would add too much
 934                  * complexity: we would have to iterate each border separately.
 935                  */
 936                 if (cam_rect->left > rect->left)
 937                         cam_rect->left = cap.bounds.left;
 938
 939                 if (cam_rect->left + cam_rect->width < rect->left + rect->width)
 940                         cam_rect->width = rect->left + rect->width -
 941                                 cam_rect->left;
 942
 943                 if (cam_rect->top > rect->top)
 944                         cam_rect->top = cap.bounds.top;
 945
 946                 if (cam_rect->top + cam_rect->height < rect->top + rect->height)
 947                         cam_rect->height = rect->top + rect->height -
 948                                 cam_rect->top;
 949
 950                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
 951                 ret = client_g_rect(sd, cam_rect);
 952                 dev_geo(dev, "Camera S_CROP %d for %ux%u@%u:%u\n", ret,
 953                         cam_rect->width, cam_rect->height,
 954                         cam_rect->left, cam_rect->top);
 955         }
 956
 957         /* S_CROP must not modify the rectangle */
 958         if (is_smaller(cam_rect, rect) || is_inside(cam_rect, rect)) {
 959                 /*
 960                  * The camera failed to configure a suitable cropping,
 961                  * we cannot use the current rectangle, set to max
 962                  */
 963                 *cam_rect = cap.bounds;
 964                 v4l2_subdev_call(sd, video, s_crop, cam_crop);
 965                 ret = client_g_rect(sd, cam_rect);
 966                 dev_geo(dev, "Camera S_CROP %d for max %ux%u@%u:%u\n", ret,
 967                         cam_rect->width, cam_rect->height,
 968                         cam_rect->left, cam_rect->top);
 969         }
 970
 971         return ret;
 972 }
 973
 974 static int get_camera_scales(struct v4l2_subdev *sd, struct v4l2_rect *rect,
 975                              unsigned int *scale_h, unsigned int *scale_v)
 976 {
 977         struct v4l2_format f;
 978         int ret;
 979
 980         f.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 981
 982         ret = v4l2_subdev_call(sd, video, g_fmt, &f);
 983         if (ret < 0)
 984                 return ret;
 985
 986         *scale_h = calc_generic_scale(rect->width, f.fmt.pix.width);
 987         *scale_v = calc_generic_scale(rect->height, f.fmt.pix.height);
 988
 989         return 0;
 990 }
 991
 992 static int get_camera_subwin(struct soc_camera_device *icd,
 993                              struct v4l2_rect *cam_subrect,
 994                              unsigned int cam_hscale, unsigned int cam_vscale)
 995 {
 996         struct sh_mobile_ceu_cam *cam = icd->host_priv;
 997         struct v4l2_rect *ceu_rect = &cam->ceu_rect;
 998
 999         if (!ceu_rect->width) {
1000                 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1001                 struct device *dev = icd->dev.parent;
1002                 struct v4l2_format f;
1003                 struct v4l2_pix_format *pix = &f.fmt.pix;
1004                 int ret;
1005                 /* First time */
1006
1007                 f.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1008
1009                 ret = v4l2_subdev_call(sd, video, g_fmt, &f);
1010                 if (ret < 0)
1011                         return ret;
1012
1013                 dev_geo(dev, "camera fmt %ux%u\n", pix->width, pix->height);
1014
1015                 if (pix->width > 2560) {
1016                         ceu_rect->width  = 2560;
1017                         ceu_rect->left   = (pix->width - 2560) / 2;
1018                 } else {
1019                         ceu_rect->width  = pix->width;
1020                         ceu_rect->left   = 0;
1021                 }
1022
1023                 if (pix->height > 1920) {
1024                         ceu_rect->height = 1920;
1025                         ceu_rect->top    = (pix->height - 1920) / 2;
1026                 } else {
1027                         ceu_rect->height = pix->height;
1028                         ceu_rect->top    = 0;
1029                 }
1030
1031                 dev_geo(dev, "initialised CEU rect %ux%u@%u:%u\n",
1032                         ceu_rect->width, ceu_rect->height,
1033                         ceu_rect->left, ceu_rect->top);
1034         }
1035
1036         cam_subrect->width      = scale_up(ceu_rect->width, cam_hscale);
1037         cam_subrect->left       = scale_up(ceu_rect->left, cam_hscale);
1038         cam_subrect->height     = scale_up(ceu_rect->height, cam_vscale);
1039         cam_subrect->top        = scale_up(ceu_rect->top, cam_vscale);
1040
1041         return 0;
1042 }
1043
1044 static int client_s_fmt(struct soc_camera_device *icd, struct v4l2_format *f,
1045                         bool ceu_can_scale)
1046 {
1047         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1048         struct device *dev = icd->dev.parent;
1049         struct v4l2_pix_format *pix = &f->fmt.pix;
1050         unsigned int width = pix->width, height = pix->height, tmp_w, tmp_h;
1051         unsigned int max_width, max_height;
1052         struct v4l2_cropcap cap;
1053         int ret;
1054
1055         cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1056
1057         ret = v4l2_subdev_call(sd, video, cropcap, &cap);
1058         if (ret < 0)
1059                 return ret;
1060
1061         max_width = min(cap.bounds.width, 2560);
1062         max_height = min(cap.bounds.height, 1920);
1063
1064         ret = v4l2_subdev_call(sd, video, s_fmt, f);
1065         if (ret < 0)
1066                 return ret;
1067
1068         dev_geo(dev, "camera scaled to %ux%u\n", pix->width, pix->height);
1069
1070         if ((width == pix->width && height == pix->height) || !ceu_can_scale)
1071                 return 0;
1072
1073         /* Camera set a format, but geometry is not precise, try to improve */
1074         tmp_w = pix->width;
1075         tmp_h = pix->height;
1076
1077         /* width <= max_width && height <= max_height - guaranteed by try_fmt */
1078         while ((width > tmp_w || height > tmp_h) &&
1079                tmp_w < max_width && tmp_h < max_height) {
1080                 tmp_w = min(2 * tmp_w, max_width);
1081                 tmp_h = min(2 * tmp_h, max_height);
1082                 pix->width = tmp_w;
1083                 pix->height = tmp_h;
1084                 ret = v4l2_subdev_call(sd, video, s_fmt, f);
1085                 dev_geo(dev, "Camera scaled to %ux%u\n",
1086                         pix->width, pix->height);
1087                 if (ret < 0) {
1088                         /* This shouldn't happen */
1089                         dev_err(dev, "Client failed to set format: %d\n", ret);
1090                         return ret;
1091                 }
1092         }
1093
1094         return 0;
1095 }
1096
1097 /**
1098  * @rect        - camera cropped rectangle
1099  * @sub_rect    - CEU cropped rectangle, mapped back to camera input area
1100  * @ceu_rect    - on output calculated CEU crop rectangle
1101  */
1102 static int client_scale(struct soc_camera_device *icd, struct v4l2_rect *rect,
1103                         struct v4l2_rect *sub_rect, struct v4l2_rect *ceu_rect,
1104                         struct v4l2_format *f, bool ceu_can_scale)
1105 {
1106         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1107         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1108         struct device *dev = icd->dev.parent;
1109         struct v4l2_format f_tmp = *f;
1110         struct v4l2_pix_format *pix_tmp = &f_tmp.fmt.pix;
1111         unsigned int scale_h, scale_v;
1112         int ret;
1113
1114         /* 5. Apply iterative camera S_FMT for camera user window. */
1115         ret = client_s_fmt(icd, &f_tmp, ceu_can_scale);
1116         if (ret < 0)
1117                 return ret;
1118
1119         dev_geo(dev, "5: camera scaled to %ux%u\n",
1120                 pix_tmp->width, pix_tmp->height);
1121
1122         /* 6. Retrieve camera output window (g_fmt) */
1123
1124         /* unneeded - it is already in "f_tmp" */
1125
1126         /* 7. Calculate new camera scales. */
1127         ret = get_camera_scales(sd, rect, &scale_h, &scale_v);
1128         if (ret < 0)
1129                 return ret;
1130
1131         dev_geo(dev, "7: camera scales %u:%u\n", scale_h, scale_v);
1132
1133         cam->cam_width          = pix_tmp->width;
1134         cam->cam_height         = pix_tmp->height;
1135         f->fmt.pix.width        = pix_tmp->width;
1136         f->fmt.pix.height       = pix_tmp->height;
1137
1138         /*
1139          * 8. Calculate new CEU crop - apply camera scales to previously
1140          *    calculated "effective" crop.
1141          */
1142         ceu_rect->left = scale_down(sub_rect->left, scale_h);
1143         ceu_rect->width = scale_down(sub_rect->width, scale_h);
1144         ceu_rect->top = scale_down(sub_rect->top, scale_v);
1145         ceu_rect->height = scale_down(sub_rect->height, scale_v);
1146
1147         dev_geo(dev, "8: new CEU rect %ux%u@%u:%u\n",
1148                 ceu_rect->width, ceu_rect->height,
1149                 ceu_rect->left, ceu_rect->top);
1150
1151         return 0;
1152 }
1153
1154 /* Get combined scales */
1155 static int get_scales(struct soc_camera_device *icd,
1156                       unsigned int *scale_h, unsigned int *scale_v)
1157 {
1158         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1159         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1160         struct v4l2_crop cam_crop;
1161         unsigned int width_in, height_in;
1162         int ret;
1163
1164         cam_crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1165
1166         ret = client_g_rect(sd, &cam_crop.c);
1167         if (ret < 0)
1168                 return ret;
1169
1170         ret = get_camera_scales(sd, &cam_crop.c, scale_h, scale_v);
1171         if (ret < 0)
1172                 return ret;
1173
1174         width_in = scale_up(cam->ceu_rect.width, *scale_h);
1175         height_in = scale_up(cam->ceu_rect.height, *scale_v);
1176
1177         *scale_h = calc_generic_scale(width_in, icd->user_width);
1178         *scale_v = calc_generic_scale(height_in, icd->user_height);
1179
1180         return 0;
1181 }
1182
1183 /*
1184  * CEU can scale and crop, but we don't want to waste bandwidth and kill the
1185  * framerate by always requesting the maximum image from the client. See
1186  * Documentation/video4linux/sh_mobile_camera_ceu.txt for a description of
1187  * scaling and cropping algorithms and for the meaning of referenced here steps.
1188  */
1189 static int sh_mobile_ceu_set_crop(struct soc_camera_device *icd,
1190                                   struct v4l2_crop *a)
1191 {
1192         struct v4l2_rect *rect = &a->c;
1193         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1194         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1195         struct v4l2_crop cam_crop;
1196         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1197         struct v4l2_rect *cam_rect = &cam_crop.c, *ceu_rect = &cam->ceu_rect;
1198         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1199         struct device *dev = icd->dev.parent;
1200         struct v4l2_format f;
1201         struct v4l2_pix_format *pix = &f.fmt.pix;
1202         unsigned int scale_comb_h, scale_comb_v, scale_ceu_h, scale_ceu_v,
1203                 out_width, out_height;
1204         u32 capsr, cflcr;
1205         int ret;
1206
1207         /* 1. Calculate current combined scales. */
1208         ret = get_scales(icd, &scale_comb_h, &scale_comb_v);
1209         if (ret < 0)
1210                 return ret;
1211
1212         dev_geo(dev, "1: combined scales %u:%u\n", scale_comb_h, scale_comb_v);
1213
1214         /* 2. Apply iterative camera S_CROP for new input window. */
1215         ret = client_s_crop(sd, a, &cam_crop);
1216         if (ret < 0)
1217                 return ret;
1218
1219         dev_geo(dev, "2: camera cropped to %ux%u@%u:%u\n",
1220                 cam_rect->width, cam_rect->height,
1221                 cam_rect->left, cam_rect->top);
1222
1223         /* On success cam_crop contains current camera crop */
1224
1225         /*
1226          * 3. If old combined scales applied to new crop produce an impossible
1227          *    user window, adjust scales to produce nearest possible window.
1228          */
1229         out_width       = scale_down(rect->width, scale_comb_h);
1230         out_height      = scale_down(rect->height, scale_comb_v);
1231
1232         if (out_width > 2560)
1233                 out_width = 2560;
1234         else if (out_width < 2)
1235                 out_width = 2;
1236
1237         if (out_height > 1920)
1238                 out_height = 1920;
1239         else if (out_height < 4)
1240                 out_height = 4;
1241
1242         dev_geo(dev, "3: Adjusted output %ux%u\n", out_width, out_height);
1243
1244         /* 4. Use G_CROP to retrieve actual input window: already in cam_crop */
1245
1246         /*
1247          * 5. Using actual input window and calculated combined scales calculate
1248          *    camera target output window.
1249          */
1250         pix->width              = scale_down(cam_rect->width, scale_comb_h);
1251         pix->height             = scale_down(cam_rect->height, scale_comb_v);
1252
1253         dev_geo(dev, "5: camera target %ux%u\n", pix->width, pix->height);
1254
1255         /* 6. - 9. */
1256         pix->pixelformat        = cam->camera_fmt->fourcc;
1257         pix->colorspace         = cam->camera_fmt->colorspace;
1258
1259         capsr = capture_save_reset(pcdev);
1260         dev_dbg(dev, "CAPSR 0x%x, CFLCR 0x%x\n", capsr, pcdev->cflcr);
1261
1262         /* Make relative to camera rectangle */
1263         rect->left              -= cam_rect->left;
1264         rect->top               -= cam_rect->top;
1265
1266         f.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1267
1268         ret = client_scale(icd, cam_rect, rect, ceu_rect, &f,
1269                            pcdev->image_mode && !pcdev->is_interlaced);
1270
1271         dev_geo(dev, "6-9: %d\n", ret);
1272
1273         /* 10. Use CEU cropping to crop to the new window. */
1274         sh_mobile_ceu_set_rect(icd, out_width, out_height);
1275
1276         dev_geo(dev, "10: CEU cropped to %ux%u@%u:%u\n",
1277                 ceu_rect->width, ceu_rect->height,
1278                 ceu_rect->left, ceu_rect->top);
1279
1280         /*
1281          * 11. Calculate CEU scales from camera scales from results of (10) and
1282          *     user window from (3)
1283          */
1284         scale_ceu_h = calc_scale(ceu_rect->width, &out_width);
1285         scale_ceu_v = calc_scale(ceu_rect->height, &out_height);
1286
1287         dev_geo(dev, "11: CEU scales %u:%u\n", scale_ceu_h, scale_ceu_v);
1288
1289         /* 12. Apply CEU scales. */
1290         cflcr = scale_ceu_h | (scale_ceu_v << 16);
1291         if (cflcr != pcdev->cflcr) {
1292                 pcdev->cflcr = cflcr;
1293                 ceu_write(pcdev, CFLCR, cflcr);
1294         }
1295
1296         /* Restore capture */
1297         if (pcdev->active)
1298                 capsr |= 1;
1299         capture_restore(pcdev, capsr);
1300
1301         icd->user_width = out_width;
1302         icd->user_height = out_height;
1303
1304         /* Even if only camera cropping succeeded */
1305         return ret;
1306 }
1307
1308 /* Similar to set_crop multistage iterative algorithm */
1309 static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
1310                                  struct v4l2_format *f)
1311 {
1312         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1313         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1314         struct sh_mobile_ceu_cam *cam = icd->host_priv;
1315         struct v4l2_pix_format *pix = &f->fmt.pix;
1316         struct v4l2_format cam_f = *f;
1317         struct v4l2_pix_format *cam_pix = &cam_f.fmt.pix;
1318         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1319         struct device *dev = icd->dev.parent;
1320         __u32 pixfmt = pix->pixelformat;
1321         const struct soc_camera_format_xlate *xlate;
1322         struct v4l2_crop cam_crop;
1323         struct v4l2_rect *cam_rect = &cam_crop.c, cam_subrect, ceu_rect;
1324         unsigned int scale_cam_h, scale_cam_v;
1325         u16 scale_v, scale_h;
1326         int ret;
1327         bool is_interlaced, image_mode;
1328
1329         switch (pix->field) {
1330         case V4L2_FIELD_INTERLACED:
1331                 is_interlaced = true;
1332                 break;
1333         case V4L2_FIELD_ANY:
1334         default:
1335                 pix->field = V4L2_FIELD_NONE;
1336                 /* fall-through */
1337         case V4L2_FIELD_NONE:
1338                 is_interlaced = false;
1339                 break;
1340         }
1341
1342         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1343         if (!xlate) {
1344                 dev_warn(dev, "Format %x not found\n", pixfmt);
1345                 return -EINVAL;
1346         }
1347
1348         /* 1. Calculate current camera scales. */
1349         cam_crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1350
1351         ret = client_g_rect(sd, cam_rect);
1352         if (ret < 0)
1353                 return ret;
1354
1355         ret = get_camera_scales(sd, cam_rect, &scale_cam_h, &scale_cam_v);
1356         if (ret < 0)
1357                 return ret;
1358
1359         dev_geo(dev, "1: camera scales %u:%u\n", scale_cam_h, scale_cam_v);
1360
1361         /*
1362          * 2. Calculate "effective" input crop (sensor subwindow) - CEU crop
1363          *    scaled back at current camera scales onto input window.
1364          */
1365         ret = get_camera_subwin(icd, &cam_subrect, scale_cam_h, scale_cam_v);
1366         if (ret < 0)
1367                 return ret;
1368
1369         dev_geo(dev, "2: subwin %ux%u@%u:%u\n",
1370                 cam_subrect.width, cam_subrect.height,
1371                 cam_subrect.left, cam_subrect.top);
1372
1373         /*
1374          * 3. Calculate new combined scales from "effective" input window to
1375          *    requested user window.
1376          */
1377         scale_h = calc_generic_scale(cam_subrect.width, pix->width);
1378         scale_v = calc_generic_scale(cam_subrect.height, pix->height);
1379
1380         dev_geo(dev, "3: scales %u:%u\n", scale_h, scale_v);
1381
1382         /*
1383          * 4. Calculate camera output window by applying combined scales to real
1384          *    input window.
1385          */
1386         cam_pix->width = scale_down(cam_rect->width, scale_h);
1387         cam_pix->height = scale_down(cam_rect->height, scale_v);
1388         cam_pix->pixelformat = xlate->cam_fmt->fourcc;
1389
1390         switch (pixfmt) {
1391         case V4L2_PIX_FMT_NV12:
1392         case V4L2_PIX_FMT_NV21:
1393         case V4L2_PIX_FMT_NV16:
1394         case V4L2_PIX_FMT_NV61:
1395                 image_mode = true;
1396                 break;
1397         default:
1398                 image_mode = false;
1399         }
1400
1401         dev_geo(dev, "4: camera output %ux%u\n",
1402                 cam_pix->width, cam_pix->height);
1403
1404         /* 5. - 9. */
1405         ret = client_scale(icd, cam_rect, &cam_subrect, &ceu_rect, &cam_f,
1406                            image_mode && !is_interlaced);
1407
1408         dev_geo(dev, "5-9: client scale %d\n", ret);
1409
1410         /* Done with the camera. Now see if we can improve the result */
1411
1412         dev_dbg(dev, "Camera %d fmt %ux%u, requested %ux%u\n",
1413                 ret, cam_pix->width, cam_pix->height, pix->width, pix->height);
1414         if (ret < 0)
1415                 return ret;
1416
1417         /* 10. Use CEU scaling to scale to the requested user window. */
1418
1419         /* We cannot scale up */
1420         if (pix->width > cam_pix->width)
1421                 pix->width = cam_pix->width;
1422         if (pix->width > ceu_rect.width)
1423                 pix->width = ceu_rect.width;
1424
1425         if (pix->height > cam_pix->height)
1426                 pix->height = cam_pix->height;
1427         if (pix->height > ceu_rect.height)
1428                 pix->height = ceu_rect.height;
1429
1430         /* Let's rock: scale pix->{width x height} down to width x height */
1431         scale_h = calc_scale(ceu_rect.width, &pix->width);
1432         scale_v = calc_scale(ceu_rect.height, &pix->height);
1433
1434         dev_geo(dev, "10: W: %u : 0x%x = %u, H: %u : 0x%x = %u\n",
1435                 ceu_rect.width, scale_h, pix->width,
1436                 ceu_rect.height, scale_v, pix->height);
1437
1438         pcdev->cflcr = scale_h | (scale_v << 16);
1439
1440         icd->buswidth = xlate->buswidth;
1441         icd->current_fmt = xlate->host_fmt;
1442         cam->camera_fmt = xlate->cam_fmt;
1443         cam->ceu_rect = ceu_rect;
1444
1445         pcdev->is_interlaced = is_interlaced;
1446         pcdev->image_mode = image_mode;
1447
1448         return 0;
1449 }
1450
1451 static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
1452                                  struct v4l2_format *f)
1453 {
1454         const struct soc_camera_format_xlate *xlate;
1455         struct v4l2_pix_format *pix = &f->fmt.pix;
1456         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1457         __u32 pixfmt = pix->pixelformat;
1458         int width, height;
1459         int ret;
1460
1461         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1462         if (!xlate) {
1463                 dev_warn(icd->dev.parent, "Format %x not found\n", pixfmt);
1464                 return -EINVAL;
1465         }
1466
1467         /* FIXME: calculate using depth and bus width */
1468
1469         v4l_bound_align_image(&pix->width, 2, 2560, 1,
1470                               &pix->height, 4, 1920, 2, 0);
1471
1472         width = pix->width;
1473         height = pix->height;
1474
1475         pix->bytesperline = pix->width *
1476                 DIV_ROUND_UP(xlate->host_fmt->depth, 8);
1477         pix->sizeimage = pix->height * pix->bytesperline;
1478
1479         pix->pixelformat = xlate->cam_fmt->fourcc;
1480
1481         /* limit to sensor capabilities */
1482         ret = v4l2_subdev_call(sd, video, try_fmt, f);
1483         pix->pixelformat = pixfmt;
1484         if (ret < 0)
1485                 return ret;
1486
1487         switch (pixfmt) {
1488         case V4L2_PIX_FMT_NV12:
1489         case V4L2_PIX_FMT_NV21:
1490         case V4L2_PIX_FMT_NV16:
1491         case V4L2_PIX_FMT_NV61:
1492                 /* FIXME: check against rect_max after converting soc-camera */
1493                 /* We can scale precisely, need a bigger image from camera */
1494                 if (pix->width < width || pix->height < height) {
1495                         int tmp_w = pix->width, tmp_h = pix->height;
1496                         pix->width = 2560;
1497                         pix->height = 1920;
1498                         ret = v4l2_subdev_call(sd, video, try_fmt, f);
1499                         if (ret < 0) {
1500                                 /* Shouldn't actually happen... */
1501                                 dev_err(icd->dev.parent,
1502                                         "FIXME: try_fmt() returned %d\n", ret);
1503                                 pix->width = tmp_w;
1504                                 pix->height = tmp_h;
1505                         }
1506                 }
1507                 if (pix->width > width)
1508                         pix->width = width;
1509                 if (pix->height > height)
1510                         pix->height = height;
1511         }
1512
1513         return ret;
1514 }
1515
1516 static int sh_mobile_ceu_reqbufs(struct soc_camera_file *icf,
1517                                  struct v4l2_requestbuffers *p)
1518 {
1519         int i;
1520
1521         /* This is for locking debugging only. I removed spinlocks and now I
1522          * check whether .prepare is ever called on a linked buffer, or whether
1523          * a dma IRQ can occur for an in-work or unlinked buffer. Until now
1524          * it hadn't triggered */
1525         for (i = 0; i < p->count; i++) {
1526                 struct sh_mobile_ceu_buffer *buf;
1527
1528                 buf = container_of(icf->vb_vidq.bufs[i],
1529                                    struct sh_mobile_ceu_buffer, vb);
1530                 INIT_LIST_HEAD(&buf->vb.queue);
1531         }
1532
1533         return 0;
1534 }
1535
1536 static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
1537 {
1538         struct soc_camera_file *icf = file->private_data;
1539         struct sh_mobile_ceu_buffer *buf;
1540
1541         buf = list_entry(icf->vb_vidq.stream.next,
1542                          struct sh_mobile_ceu_buffer, vb.stream);
1543
1544         poll_wait(file, &buf->vb.done, pt);
1545
1546         if (buf->vb.state == VIDEOBUF_DONE ||
1547             buf->vb.state == VIDEOBUF_ERROR)
1548                 return POLLIN|POLLRDNORM;
1549
1550         return 0;
1551 }
1552
1553 static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
1554                                   struct v4l2_capability *cap)
1555 {
1556         strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
1557         cap->version = KERNEL_VERSION(0, 0, 5);
1558         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1559         return 0;
1560 }
1561
1562 static void sh_mobile_ceu_init_videobuf(struct videobuf_queue *q,
1563                                         struct soc_camera_device *icd)
1564 {
1565         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1566         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1567
1568         videobuf_queue_dma_contig_init(q,
1569                                        &sh_mobile_ceu_videobuf_ops,
1570                                        icd->dev.parent, &pcdev->lock,
1571                                        V4L2_BUF_TYPE_VIDEO_CAPTURE,
1572                                        pcdev->is_interlaced ?
1573                                        V4L2_FIELD_INTERLACED : V4L2_FIELD_NONE,
1574                                        sizeof(struct sh_mobile_ceu_buffer),
1575                                        icd);
1576 }
1577
1578 static int sh_mobile_ceu_get_ctrl(struct soc_camera_device *icd,
1579                                   struct v4l2_control *ctrl)
1580 {
1581         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1582         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1583         u32 val;
1584
1585         switch (ctrl->id) {
1586         case V4L2_CID_SHARPNESS:
1587                 val = ceu_read(pcdev, CLFCR);
1588                 ctrl->value = val ^ 1;
1589                 return 0;
1590         }
1591         return -ENOIOCTLCMD;
1592 }
1593
1594 static int sh_mobile_ceu_set_ctrl(struct soc_camera_device *icd,
1595                                   struct v4l2_control *ctrl)
1596 {
1597         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1598         struct sh_mobile_ceu_dev *pcdev = ici->priv;
1599
1600         switch (ctrl->id) {
1601         case V4L2_CID_SHARPNESS:
1602                 switch (icd->current_fmt->fourcc) {
1603                 case V4L2_PIX_FMT_NV12:
1604                 case V4L2_PIX_FMT_NV21:
1605                 case V4L2_PIX_FMT_NV16:
1606                 case V4L2_PIX_FMT_NV61:
1607                         ceu_write(pcdev, CLFCR, !ctrl->value);
1608                         return 0;
1609                 }
1610                 return -EINVAL;
1611         }
1612         return -ENOIOCTLCMD;
1613 }
1614
1615 static const struct v4l2_queryctrl sh_mobile_ceu_controls[] = {
1616         {
1617                 .id             = V4L2_CID_SHARPNESS,
1618                 .type           = V4L2_CTRL_TYPE_BOOLEAN,
1619                 .name           = "Low-pass filter",
1620                 .minimum        = 0,
1621                 .maximum        = 1,
1622                 .step           = 1,
1623                 .default_value  = 0,
1624         },
1625 };
1626
1627 static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
1628         .owner          = THIS_MODULE,
1629         .add            = sh_mobile_ceu_add_device,
1630         .remove         = sh_mobile_ceu_remove_device,
1631         .get_formats    = sh_mobile_ceu_get_formats,
1632         .put_formats    = sh_mobile_ceu_put_formats,
1633         .set_crop       = sh_mobile_ceu_set_crop,
1634         .set_fmt        = sh_mobile_ceu_set_fmt,
1635         .try_fmt        = sh_mobile_ceu_try_fmt,
1636         .set_ctrl       = sh_mobile_ceu_set_ctrl,
1637         .get_ctrl       = sh_mobile_ceu_get_ctrl,
1638         .reqbufs        = sh_mobile_ceu_reqbufs,
1639         .poll           = sh_mobile_ceu_poll,
1640         .querycap       = sh_mobile_ceu_querycap,
1641         .set_bus_param  = sh_mobile_ceu_set_bus_param,
1642         .init_videobuf  = sh_mobile_ceu_init_videobuf,
1643         .controls       = sh_mobile_ceu_controls,
1644         .num_controls   = ARRAY_SIZE(sh_mobile_ceu_controls),
1645 };
1646
1647 static int __devinit sh_mobile_ceu_probe(struct platform_device *pdev)
1648 {
1649         struct sh_mobile_ceu_dev *pcdev;
1650         struct resource *res;
1651         void __iomem *base;
1652         unsigned int irq;
1653         int err = 0;
1654
1655         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1656         irq = platform_get_irq(pdev, 0);
1657         if (!res || !irq) {
1658                 dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
1659                 err = -ENODEV;
1660                 goto exit;
1661         }
1662
1663         pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
1664         if (!pcdev) {
1665                 dev_err(&pdev->dev, "Could not allocate pcdev\n");
1666                 err = -ENOMEM;
1667                 goto exit;
1668         }
1669
1670         INIT_LIST_HEAD(&pcdev->capture);
1671         spin_lock_init(&pcdev->lock);
1672
1673         pcdev->pdata = pdev->dev.platform_data;
1674         if (!pcdev->pdata) {
1675                 err = -EINVAL;
1676                 dev_err(&pdev->dev, "CEU platform data not set.\n");
1677                 goto exit_kfree;
1678         }
1679
1680         base = ioremap_nocache(res->start, resource_size(res));
1681         if (!base) {
1682                 err = -ENXIO;
1683                 dev_err(&pdev->dev, "Unable to ioremap CEU registers.\n");
1684                 goto exit_kfree;
1685         }
1686
1687         pcdev->irq = irq;
1688         pcdev->base = base;
1689         pcdev->video_limit = 0; /* only enabled if second resource exists */
1690
1691         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1692         if (res) {
1693                 err = dma_declare_coherent_memory(&pdev->dev, res->start,
1694                                                   res->start,
1695                                                   resource_size(res),
1696                                                   DMA_MEMORY_MAP |
1697                                                   DMA_MEMORY_EXCLUSIVE);
1698                 if (!err) {
1699                         dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
1700                         err = -ENXIO;
1701                         goto exit_iounmap;
1702                 }
1703
1704                 pcdev->video_limit = resource_size(res);
1705         }
1706
1707         /* request irq */
1708         err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED,
1709                           dev_name(&pdev->dev), pcdev);
1710         if (err) {
1711                 dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
1712                 goto exit_release_mem;
1713         }
1714
1715         pm_suspend_ignore_children(&pdev->dev, true);
1716         pm_runtime_enable(&pdev->dev);
1717         pm_runtime_resume(&pdev->dev);
1718
1719         pcdev->ici.priv = pcdev;
1720         pcdev->ici.v4l2_dev.dev = &pdev->dev;
1721         pcdev->ici.nr = pdev->id;
1722         pcdev->ici.drv_name = dev_name(&pdev->dev);
1723         pcdev->ici.ops = &sh_mobile_ceu_host_ops;
1724
1725         err = soc_camera_host_register(&pcdev->ici);
1726         if (err)
1727                 goto exit_free_clk;
1728
1729         return 0;
1730
1731 exit_free_clk:
1732         pm_runtime_disable(&pdev->dev);
1733         free_irq(pcdev->irq, pcdev);
1734 exit_release_mem:
1735         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
1736                 dma_release_declared_memory(&pdev->dev);
1737 exit_iounmap:
1738         iounmap(base);
1739 exit_kfree:
1740         kfree(pcdev);
1741 exit:
1742         return err;
1743 }
1744
1745 static int __devexit sh_mobile_ceu_remove(struct platform_device *pdev)
1746 {
1747         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
1748         struct sh_mobile_ceu_dev *pcdev = container_of(soc_host,
1749                                         struct sh_mobile_ceu_dev, ici);
1750
1751         soc_camera_host_unregister(soc_host);
1752         pm_runtime_disable(&pdev->dev);
1753         free_irq(pcdev->irq, pcdev);
1754         if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
1755                 dma_release_declared_memory(&pdev->dev);
1756         iounmap(pcdev->base);
1757         kfree(pcdev);
1758         return 0;
1759 }
1760
1761 static int sh_mobile_ceu_runtime_nop(struct device *dev)
1762 {
1763         /* Runtime PM callback shared between ->runtime_suspend()
1764          * and ->runtime_resume(). Simply returns success.
1765          *
1766          * This driver re-initializes all registers after
1767          * pm_runtime_get_sync() anyway so there is no need
1768          * to save and restore registers here.
1769          */
1770         return 0;
1771 }
1772
1773 static struct dev_pm_ops sh_mobile_ceu_dev_pm_ops = {
1774         .runtime_suspend = sh_mobile_ceu_runtime_nop,
1775         .runtime_resume = sh_mobile_ceu_runtime_nop,
1776 };
1777
1778 static struct platform_driver sh_mobile_ceu_driver = {
1779         .driver         = {
1780                 .name   = "sh_mobile_ceu",
1781                 .pm     = &sh_mobile_ceu_dev_pm_ops,
1782         },
1783         .probe          = sh_mobile_ceu_probe,
1784         .remove         = __exit_p(sh_mobile_ceu_remove),
1785 };
1786
1787 static int __init sh_mobile_ceu_init(void)
1788 {
1789         return platform_driver_register(&sh_mobile_ceu_driver);
1790 }
1791
1792 static void __exit sh_mobile_ceu_exit(void)
1793 {
1794         platform_driver_unregister(&sh_mobile_ceu_driver);
1795 }
1796
1797 module_init(sh_mobile_ceu_init);
1798 module_exit(sh_mobile_ceu_exit);
1799
1800 MODULE_DESCRIPTION("SuperH Mobile CEU driver");
1801 MODULE_AUTHOR("Magnus Damm");
1802 MODULE_LICENSE("GPL");
1803 MODULE_ALIAS("platform:sh_mobile_ceu");