drivers/media/video/omap24xxcam.c

   1 /*
   2  * drivers/media/video/omap24xxcam.c
   3  *
   4  * OMAP 2 camera block driver.
   5  *
   6  * Copyright (C) 2004 MontaVista Software, Inc.
   7  * Copyright (C) 2004 Texas Instruments.
   8  * Copyright (C) 2007-2008 Nokia Corporation.
   9  *
  10  * Contact: Sakari Ailus <sakari.ailus@nokia.com>
  11  *
  12  * Based on code from Andy Lowe <source@mvista.com>
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License
  16  * version 2 as published by the Free Software Foundation.
  17  *
  18  * This program is distributed in the hope that it will be useful, but
  19  * WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21  * General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  26  * 02110-1301 USA
  27  */
  28
  29 #include <linux/delay.h>
  30 #include <linux/kernel.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/videodev2.h>
  33 #include <linux/pci.h>          /* needed for videobufs */
  34 #include <linux/version.h>
  35 #include <linux/platform_device.h>
  36 #include <linux/clk.h>
  37 #include <linux/io.h>
  38
  39 #include <media/v4l2-common.h>
  40 #include <media/v4l2-ioctl.h>
  41
  42 #include "omap24xxcam.h"
  43
  44 #define OMAP24XXCAM_VERSION KERNEL_VERSION(0, 0, 0)
  45
  46 #define RESET_TIMEOUT_NS 10000
  47
  48 static void omap24xxcam_reset(struct omap24xxcam_device *cam);
  49 static int omap24xxcam_sensor_if_enable(struct omap24xxcam_device *cam);
  50 static void omap24xxcam_device_unregister(struct v4l2_int_device *s);
  51 static int omap24xxcam_remove(struct platform_device *pdev);
  52
  53 /* module parameters */
  54 static int video_nr = -1;       /* video device minor (-1 ==> auto assign) */
  55 /*
  56  * Maximum amount of memory to use for capture buffers.
  57  * Default is 4800KB, enough to double-buffer SXGA.
  58  */
  59 static int capture_mem = 1280 * 960 * 2 * 2;
  60
  61 static struct v4l2_int_device omap24xxcam;
  62
  63 /*
  64  *
  65  * Clocks.
  66  *
  67  */
  68
  69 static void omap24xxcam_clock_put(struct omap24xxcam_device *cam)
  70 {
  71         if (cam->ick != NULL && !IS_ERR(cam->ick))
  72                 clk_put(cam->ick);
  73         if (cam->fck != NULL && !IS_ERR(cam->fck))
  74                 clk_put(cam->fck);
  75
  76         cam->ick = cam->fck = NULL;
  77 }
  78
  79 static int omap24xxcam_clock_get(struct omap24xxcam_device *cam)
  80 {
  81         int rval = 0;
  82
  83         cam->fck = clk_get(cam->dev, "fck");
  84         if (IS_ERR(cam->fck)) {
  85                 dev_err(cam->dev, "can't get camera fck");
  86                 rval = PTR_ERR(cam->fck);
  87                 omap24xxcam_clock_put(cam);
  88                 return rval;
  89         }
  90
  91         cam->ick = clk_get(cam->dev, "ick");
  92         if (IS_ERR(cam->ick)) {
  93                 dev_err(cam->dev, "can't get camera ick");
  94                 rval = PTR_ERR(cam->ick);
  95                 omap24xxcam_clock_put(cam);
  96         }
  97
  98         return rval;
  99 }
 100
 101 static void omap24xxcam_clock_on(struct omap24xxcam_device *cam)
 102 {
 103         clk_enable(cam->fck);
 104         clk_enable(cam->ick);
 105 }
 106
 107 static void omap24xxcam_clock_off(struct omap24xxcam_device *cam)
 108 {
 109         clk_disable(cam->fck);
 110         clk_disable(cam->ick);
 111 }
 112
 113 /*
 114  *
 115  * Camera core
 116  *
 117  */
 118
 119 /*
 120  * Set xclk.
 121  *
 122  * To disable xclk, use value zero.
 123  */
 124 static void omap24xxcam_core_xclk_set(const struct omap24xxcam_device *cam,
 125                                       u32 xclk)
 126 {
 127         if (xclk) {
 128                 u32 divisor = CAM_MCLK / xclk;
 129
 130                 if (divisor == 1)
 131                         omap24xxcam_reg_out(cam->mmio_base + CC_REG_OFFSET,
 132                                             CC_CTRL_XCLK,
 133                                             CC_CTRL_XCLK_DIV_BYPASS);
 134                 else
 135                         omap24xxcam_reg_out(cam->mmio_base + CC_REG_OFFSET,
 136                                             CC_CTRL_XCLK, divisor);
 137         } else
 138                 omap24xxcam_reg_out(cam->mmio_base + CC_REG_OFFSET,
 139                                     CC_CTRL_XCLK, CC_CTRL_XCLK_DIV_STABLE_LOW);
 140 }
 141
 142 static void omap24xxcam_core_hwinit(const struct omap24xxcam_device *cam)
 143 {
 144         /*
 145          * Setting the camera core AUTOIDLE bit causes problems with frame
 146          * synchronization, so we will clear the AUTOIDLE bit instead.
 147          */
 148         omap24xxcam_reg_out(cam->mmio_base + CC_REG_OFFSET, CC_SYSCONFIG,
 149                             CC_SYSCONFIG_AUTOIDLE);
 150
 151         /* program the camera interface DMA packet size */
 152         omap24xxcam_reg_out(cam->mmio_base + CC_REG_OFFSET, CC_CTRL_DMA,
 153                             CC_CTRL_DMA_EN | (DMA_THRESHOLD / 4 - 1));
 154
 155         /* enable camera core error interrupts */
 156         omap24xxcam_reg_out(cam->mmio_base + CC_REG_OFFSET, CC_IRQENABLE,
 157                             CC_IRQENABLE_FW_ERR_IRQ
 158                             | CC_IRQENABLE_FSC_ERR_IRQ
 159                             | CC_IRQENABLE_SSC_ERR_IRQ
 160                             | CC_IRQENABLE_FIFO_OF_IRQ);
 161 }
 162
 163 /*
 164  * Enable the camera core.
 165  *
 166  * Data transfer to the camera DMA starts from next starting frame.
 167  */
 168 static void omap24xxcam_core_enable(const struct omap24xxcam_device *cam)
 169 {
 170
 171         omap24xxcam_reg_out(cam->mmio_base + CC_REG_OFFSET, CC_CTRL,
 172                             cam->cc_ctrl);
 173 }
 174
 175 /*
 176  * Disable camera core.
 177  *
 178  * The data transfer will be stopped immediately (CC_CTRL_CC_RST). The
 179  * core internal state machines will be reset. Use
 180  * CC_CTRL_CC_FRAME_TRIG instead if you want to transfer the current
 181  * frame completely.
 182  */
 183 static void omap24xxcam_core_disable(const struct omap24xxcam_device *cam)
 184 {
 185         omap24xxcam_reg_out(cam->mmio_base + CC_REG_OFFSET, CC_CTRL,
 186                             CC_CTRL_CC_RST);
 187 }
 188
 189 /* Interrupt service routine for camera core interrupts. */
 190 static void omap24xxcam_core_isr(struct omap24xxcam_device *cam)
 191 {
 192         u32 cc_irqstatus;
 193         const u32 cc_irqstatus_err =
 194                 CC_IRQSTATUS_FW_ERR_IRQ
 195                 | CC_IRQSTATUS_FSC_ERR_IRQ
 196                 | CC_IRQSTATUS_SSC_ERR_IRQ
 197                 | CC_IRQSTATUS_FIFO_UF_IRQ
 198                 | CC_IRQSTATUS_FIFO_OF_IRQ;
 199
 200         cc_irqstatus = omap24xxcam_reg_in(cam->mmio_base + CC_REG_OFFSET,
 201                                           CC_IRQSTATUS);
 202         omap24xxcam_reg_out(cam->mmio_base + CC_REG_OFFSET, CC_IRQSTATUS,
 203                             cc_irqstatus);
 204
 205         if (cc_irqstatus & cc_irqstatus_err
 206             && !atomic_read(&cam->in_reset)) {
 207                 dev_dbg(cam->dev, "resetting camera, cc_irqstatus 0x%x\n",
 208                         cc_irqstatus);
 209                 omap24xxcam_reset(cam);
 210         }
 211 }
 212
 213 /*
 214  *
 215  * videobuf_buffer handling.
 216  *
 217  * Memory for mmapped videobuf_buffers is not allocated
 218  * conventionally, but by several kmalloc allocations and then
 219  * creating the scatterlist on our own. User-space buffers are handled
 220  * normally.
 221  *
 222  */
 223
 224 /*
 225  * Free the memory-mapped buffer memory allocated for a
 226  * videobuf_buffer and the associated scatterlist.
 227  */
 228 static void omap24xxcam_vbq_free_mmap_buffer(struct videobuf_buffer *vb)
 229 {
 230         struct videobuf_dmabuf *dma = videobuf_to_dma(vb);
 231         size_t alloc_size;
 232         struct page *page;
 233         int i;
 234
 235         if (dma->sglist == NULL)
 236                 return;
 237
 238         i = dma->sglen;
 239         while (i) {
 240                 i--;
 241                 alloc_size = sg_dma_len(&dma->sglist[i]);
 242                 page = sg_page(&dma->sglist[i]);
 243                 do {
 244                         ClearPageReserved(page++);
 245                 } while (alloc_size -= PAGE_SIZE);
 246                 __free_pages(sg_page(&dma->sglist[i]),
 247                              get_order(sg_dma_len(&dma->sglist[i])));
 248         }
 249
 250         kfree(dma->sglist);
 251         dma->sglist = NULL;
 252 }
 253
 254 /* Release all memory related to the videobuf_queue. */
 255 static void omap24xxcam_vbq_free_mmap_buffers(struct videobuf_queue *vbq)
 256 {
 257         int i;
 258
 259         mutex_lock(&vbq->vb_lock);
 260
 261         for (i = 0; i < VIDEO_MAX_FRAME; i++) {
 262                 if (NULL == vbq->bufs[i])
 263                         continue;
 264                 if (V4L2_MEMORY_MMAP != vbq->bufs[i]->memory)
 265                         continue;
 266                 vbq->ops->buf_release(vbq, vbq->bufs[i]);
 267                 omap24xxcam_vbq_free_mmap_buffer(vbq->bufs[i]);
 268                 kfree(vbq->bufs[i]);
 269                 vbq->bufs[i] = NULL;
 270         }
 271
 272         mutex_unlock(&vbq->vb_lock);
 273
 274         videobuf_mmap_free(vbq);
 275 }
 276
 277 /*
 278  * Allocate physically as contiguous as possible buffer for video
 279  * frame and allocate and build DMA scatter-gather list for it.
 280  */
 281 static int omap24xxcam_vbq_alloc_mmap_buffer(struct videobuf_buffer *vb)
 282 {
 283         unsigned int order;
 284         size_t alloc_size, size = vb->bsize; /* vb->bsize is page aligned */
 285         struct page *page;
 286         int max_pages, err = 0, i = 0;
 287         struct videobuf_dmabuf *dma = videobuf_to_dma(vb);
 288
 289         /*
 290          * allocate maximum size scatter-gather list. Note this is
 291          * overhead. We may not use as many entries as we allocate
 292          */
 293         max_pages = vb->bsize >> PAGE_SHIFT;
 294         dma->sglist = kcalloc(max_pages, sizeof(*dma->sglist), GFP_KERNEL);
 295         if (dma->sglist == NULL) {
 296                 err = -ENOMEM;
 297                 goto out;
 298         }
 299
 300         while (size) {
 301                 order = get_order(size);
 302                 /*
 303                  * do not over-allocate even if we would get larger
 304                  * contiguous chunk that way
 305                  */
 306                 if ((PAGE_SIZE << order) > size)
 307                         order--;
 308
 309                 /* try to allocate as many contiguous pages as possible */
 310                 page = alloc_pages(GFP_KERNEL | GFP_DMA, order);
 311                 /* if allocation fails, try to allocate smaller amount */
 312                 while (page == NULL) {
 313                         order--;
 314                         page = alloc_pages(GFP_KERNEL | GFP_DMA, order);
 315                         if (page == NULL && !order) {
 316                                 err = -ENOMEM;
 317                                 goto out;
 318                         }
 319                 }
 320                 size -= (PAGE_SIZE << order);
 321
 322                 /* append allocated chunk of pages into scatter-gather list */
 323                 sg_set_page(&dma->sglist[i], page, PAGE_SIZE << order, 0);
 324                 dma->sglen++;
 325                 i++;
 326
 327                 alloc_size = (PAGE_SIZE << order);
 328
 329                 /* clear pages before giving them to user space */
 330                 memset(page_address(page), 0, alloc_size);
 331
 332                 /* mark allocated pages reserved */
 333                 do {
 334                         SetPageReserved(page++);
 335                 } while (alloc_size -= PAGE_SIZE);
 336         }
 337         /*
 338          * REVISIT: not fully correct to assign nr_pages == sglen but
 339          * video-buf is passing nr_pages for e.g. unmap_sg calls
 340          */
 341         dma->nr_pages = dma->sglen;
 342         dma->direction = PCI_DMA_FROMDEVICE;
 343
 344         return 0;
 345
 346 out:
 347         omap24xxcam_vbq_free_mmap_buffer(vb);
 348         return err;
 349 }
 350
 351 static int omap24xxcam_vbq_alloc_mmap_buffers(struct videobuf_queue *vbq,
 352                                               unsigned int count)
 353 {
 354         int i, err = 0;
 355         struct omap24xxcam_fh *fh =
 356                 container_of(vbq, struct omap24xxcam_fh, vbq);
 357
 358         mutex_lock(&vbq->vb_lock);
 359
 360         for (i = 0; i < count; i++) {
 361                 err = omap24xxcam_vbq_alloc_mmap_buffer(vbq->bufs[i]);
 362                 if (err)
 363                         goto out;
 364                 dev_dbg(fh->cam->dev, "sglen is %d for buffer %d\n",
 365                         videobuf_to_dma(vbq->bufs[i])->sglen, i);
 366         }
 367
 368         mutex_unlock(&vbq->vb_lock);
 369
 370         return 0;
 371 out:
 372         while (i) {
 373                 i--;
 374                 omap24xxcam_vbq_free_mmap_buffer(vbq->bufs[i]);
 375         }
 376
 377         mutex_unlock(&vbq->vb_lock);
 378
 379         return err;
 380 }
 381
 382 /*
 383  * This routine is called from interrupt context when a scatter-gather DMA
 384  * transfer of a videobuf_buffer completes.
 385  */
 386 static void omap24xxcam_vbq_complete(struct omap24xxcam_sgdma *sgdma,
 387                                      u32 csr, void *arg)
 388 {
 389         struct omap24xxcam_device *cam =
 390                 container_of(sgdma, struct omap24xxcam_device, sgdma);
 391         struct omap24xxcam_fh *fh = cam->streaming->private_data;
 392         struct videobuf_buffer *vb = (struct videobuf_buffer *)arg;
 393         const u32 csr_error = CAMDMA_CSR_MISALIGNED_ERR
 394                 | CAMDMA_CSR_SUPERVISOR_ERR | CAMDMA_CSR_SECURE_ERR
 395                 | CAMDMA_CSR_TRANS_ERR | CAMDMA_CSR_DROP;
 396         unsigned long flags;
 397
 398         spin_lock_irqsave(&cam->core_enable_disable_lock, flags);
 399         if (--cam->sgdma_in_queue == 0)
 400                 omap24xxcam_core_disable(cam);
 401         spin_unlock_irqrestore(&cam->core_enable_disable_lock, flags);
 402
 403         do_gettimeofday(&vb->ts);
 404         vb->field_count = atomic_add_return(2, &fh->field_count);
 405         if (csr & csr_error) {
 406                 vb->state = VIDEOBUF_ERROR;
 407                 if (!atomic_read(&fh->cam->in_reset)) {
 408                         dev_dbg(cam->dev, "resetting camera, csr 0x%x\n", csr);
 409                         omap24xxcam_reset(cam);
 410                 }
 411         } else
 412                 vb->state = VIDEOBUF_DONE;
 413         wake_up(&vb->done);
 414 }
 415
 416 static void omap24xxcam_vbq_release(struct videobuf_queue *vbq,
 417                                     struct videobuf_buffer *vb)
 418 {
 419         struct videobuf_dmabuf *dma = videobuf_to_dma(vb);
 420
 421         /* wait for buffer, especially to get out of the sgdma queue */
 422         videobuf_waiton(vb, 0, 0);
 423         if (vb->memory == V4L2_MEMORY_MMAP) {
 424                 dma_unmap_sg(vbq->dev, dma->sglist, dma->sglen,
 425                              dma->direction);
 426                 dma->direction = DMA_NONE;
 427         } else {
 428                 videobuf_dma_unmap(vbq, videobuf_to_dma(vb));
 429                 videobuf_dma_free(videobuf_to_dma(vb));
 430         }
 431
 432         vb->state = VIDEOBUF_NEEDS_INIT;
 433 }
 434
 435 /*
 436  * Limit the number of available kernel image capture buffers based on the
 437  * number requested, the currently selected image size, and the maximum
 438  * amount of memory permitted for kernel capture buffers.
 439  */
 440 static int omap24xxcam_vbq_setup(struct videobuf_queue *vbq, unsigned int *cnt,
 441                                  unsigned int *size)
 442 {
 443         struct omap24xxcam_fh *fh = vbq->priv_data;
 444
 445         if (*cnt <= 0)
 446                 *cnt = VIDEO_MAX_FRAME; /* supply a default number of buffers */
 447
 448         if (*cnt > VIDEO_MAX_FRAME)
 449                 *cnt = VIDEO_MAX_FRAME;
 450
 451         *size = fh->pix.sizeimage;
 452
 453         /* accessing fh->cam->capture_mem is ok, it's constant */
 454         while (*size * *cnt > fh->cam->capture_mem)
 455                 (*cnt)--;
 456
 457         return 0;
 458 }
 459
 460 static int omap24xxcam_dma_iolock(struct videobuf_queue *vbq,
 461                                   struct videobuf_dmabuf *dma)
 462 {
 463         int err = 0;
 464
 465         dma->direction = PCI_DMA_FROMDEVICE;
 466         if (!dma_map_sg(vbq->dev, dma->sglist, dma->sglen, dma->direction)) {
 467                 kfree(dma->sglist);
 468                 dma->sglist = NULL;
 469                 dma->sglen = 0;
 470                 err = -EIO;
 471         }
 472
 473         return err;
 474 }
 475
 476 static int omap24xxcam_vbq_prepare(struct videobuf_queue *vbq,
 477                                    struct videobuf_buffer *vb,
 478                                    enum v4l2_field field)
 479 {
 480         struct omap24xxcam_fh *fh = vbq->priv_data;
 481         int err = 0;
 482
 483         /*
 484          * Accessing pix here is okay since it's constant while
 485          * streaming is on (and we only get called then).
 486          */
 487         if (vb->baddr) {
 488                 /* This is a userspace buffer. */
 489                 if (fh->pix.sizeimage > vb->bsize) {
 490                         /* The buffer isn't big enough. */
 491                         err = -EINVAL;
 492                 } else
 493                         vb->size = fh->pix.sizeimage;
 494         } else {
 495                 if (vb->state != VIDEOBUF_NEEDS_INIT) {
 496                         /*
 497                          * We have a kernel bounce buffer that has
 498                          * already been allocated.
 499                          */
 500                         if (fh->pix.sizeimage > vb->size) {
 501                                 /*
 502                                  * The image size has been changed to
 503                                  * a larger size since this buffer was
 504                                  * allocated, so we need to free and
 505                                  * reallocate it.
 506                                  */
 507                                 omap24xxcam_vbq_release(vbq, vb);
 508                                 vb->size = fh->pix.sizeimage;
 509                         }
 510                 } else {
 511                         /* We need to allocate a new kernel bounce buffer. */
 512                         vb->size = fh->pix.sizeimage;
 513                 }
 514         }
 515
 516         if (err)
 517                 return err;
 518
 519         vb->width = fh->pix.width;
 520         vb->height = fh->pix.height;
 521         vb->field = field;
 522
 523         if (vb->state == VIDEOBUF_NEEDS_INIT) {
 524                 if (vb->memory == V4L2_MEMORY_MMAP)
 525                         /*
 526                          * we have built the scatter-gather list by ourself so
 527                          * do the scatter-gather mapping as well
 528                          */
 529                         err = omap24xxcam_dma_iolock(vbq, videobuf_to_dma(vb));
 530                 else
 531                         err = videobuf_iolock(vbq, vb, NULL);
 532         }
 533
 534         if (!err)
 535                 vb->state = VIDEOBUF_PREPARED;
 536         else
 537                 omap24xxcam_vbq_release(vbq, vb);
 538
 539         return err;
 540 }
 541
 542 static void omap24xxcam_vbq_queue(struct videobuf_queue *vbq,
 543                                   struct videobuf_buffer *vb)
 544 {
 545         struct omap24xxcam_fh *fh = vbq->priv_data;
 546         struct omap24xxcam_device *cam = fh->cam;
 547         enum videobuf_state state = vb->state;
 548         unsigned long flags;
 549         int err;
 550
 551         /*
 552          * FIXME: We're marking the buffer active since we have no
 553          * pretty way of marking it active exactly when the
 554          * scatter-gather transfer starts.
 555          */
 556         vb->state = VIDEOBUF_ACTIVE;
 557
 558         err = omap24xxcam_sgdma_queue(&fh->cam->sgdma,
 559                                       videobuf_to_dma(vb)->sglist,
 560                                       videobuf_to_dma(vb)->sglen, vb->size,
 561                                       omap24xxcam_vbq_complete, vb);
 562
 563         if (!err) {
 564                 spin_lock_irqsave(&cam->core_enable_disable_lock, flags);
 565                 if (++cam->sgdma_in_queue == 1
 566                     && !atomic_read(&cam->in_reset))
 567                         omap24xxcam_core_enable(cam);
 568                 spin_unlock_irqrestore(&cam->core_enable_disable_lock, flags);
 569         } else {
 570                 /*
 571                  * Oops. We're not supposed to get any errors here.
 572                  * The only way we could get an error is if we ran out
 573                  * of scatter-gather DMA slots, but we are supposed to
 574                  * have at least as many scatter-gather DMA slots as
 575                  * video buffers so that can't happen.
 576                  */
 577                 dev_err(cam->dev, "failed to queue a video buffer for dma!\n");
 578                 dev_err(cam->dev, "likely a bug in the driver!\n");
 579                 vb->state = state;
 580         }
 581 }
 582
 583 static struct videobuf_queue_ops omap24xxcam_vbq_ops = {
 584         .buf_setup   = omap24xxcam_vbq_setup,
 585         .buf_prepare = omap24xxcam_vbq_prepare,
 586         .buf_queue   = omap24xxcam_vbq_queue,
 587         .buf_release = omap24xxcam_vbq_release,
 588 };
 589
 590 /*
 591  *
 592  * OMAP main camera system
 593  *
 594  */
 595
 596 /*
 597  * Reset camera block to power-on state.
 598  */
 599 static void omap24xxcam_poweron_reset(struct omap24xxcam_device *cam)
 600 {
 601         int max_loop = RESET_TIMEOUT_NS;
 602
 603         /* Reset whole camera subsystem */
 604         omap24xxcam_reg_out(cam->mmio_base,
 605                             CAM_SYSCONFIG,
 606                             CAM_SYSCONFIG_SOFTRESET);
 607
 608         /* Wait till it's finished */
 609         while (!(omap24xxcam_reg_in(cam->mmio_base, CAM_SYSSTATUS)
 610                  & CAM_SYSSTATUS_RESETDONE)
 611                && --max_loop) {
 612                 ndelay(1);
 613         }
 614
 615         if (!(omap24xxcam_reg_in(cam->mmio_base, CAM_SYSSTATUS)
 616               & CAM_SYSSTATUS_RESETDONE))
 617                 dev_err(cam->dev, "camera soft reset timeout\n");
 618 }
 619
 620 /*
 621  * (Re)initialise the camera block.
 622  */
 623 static void omap24xxcam_hwinit(struct omap24xxcam_device *cam)
 624 {
 625         omap24xxcam_poweron_reset(cam);
 626
 627         /* set the camera subsystem autoidle bit */
 628         omap24xxcam_reg_out(cam->mmio_base, CAM_SYSCONFIG,
 629                             CAM_SYSCONFIG_AUTOIDLE);
 630
 631         /* set the camera MMU autoidle bit */
 632         omap24xxcam_reg_out(cam->mmio_base,
 633                             CAMMMU_REG_OFFSET + CAMMMU_SYSCONFIG,
 634                             CAMMMU_SYSCONFIG_AUTOIDLE);
 635
 636         omap24xxcam_core_hwinit(cam);
 637
 638         omap24xxcam_dma_hwinit(&cam->sgdma.dma);
 639 }
 640
 641 /*
 642  * Callback for dma transfer stalling.
 643  */
 644 static void omap24xxcam_stalled_dma_reset(unsigned long data)
 645 {
 646         struct omap24xxcam_device *cam = (struct omap24xxcam_device *)data;
 647
 648         if (!atomic_read(&cam->in_reset)) {
 649                 dev_dbg(cam->dev, "dma stalled, resetting camera\n");
 650                 omap24xxcam_reset(cam);
 651         }
 652 }
 653
 654 /*
 655  * Stop capture. Mark we're doing a reset, stop DMA transfers and
 656  * core. (No new scatter-gather transfers will be queued whilst
 657  * in_reset is non-zero.)
 658  *
 659  * If omap24xxcam_capture_stop is called from several places at
 660  * once, only the first call will have an effect. Similarly, the last
 661  * call omap24xxcam_streaming_cont will have effect.
 662  *
 663  * Serialisation is ensured by using cam->core_enable_disable_lock.
 664  */
 665 static void omap24xxcam_capture_stop(struct omap24xxcam_device *cam)
 666 {
 667         unsigned long flags;
 668
 669         spin_lock_irqsave(&cam->core_enable_disable_lock, flags);
 670
 671         if (atomic_inc_return(&cam->in_reset) != 1) {
 672                 spin_unlock_irqrestore(&cam->core_enable_disable_lock, flags);
 673                 return;
 674         }
 675
 676         omap24xxcam_core_disable(cam);
 677
 678         spin_unlock_irqrestore(&cam->core_enable_disable_lock, flags);
 679
 680         omap24xxcam_sgdma_sync(&cam->sgdma);
 681 }
 682
 683 /*
 684  * Reset and continue streaming.
 685  *
 686  * Note: Resetting the camera FIFO via the CC_RST bit in the CC_CTRL
 687  * register is supposed to be sufficient to recover from a camera
 688  * interface error, but it doesn't seem to be enough. If we only do
 689  * that then subsequent image captures are out of sync by either one
 690  * or two times DMA_THRESHOLD bytes. Resetting and re-initializing the
 691  * entire camera subsystem prevents the problem with frame
 692  * synchronization.
 693  */
 694 static void omap24xxcam_capture_cont(struct omap24xxcam_device *cam)
 695 {
 696         unsigned long flags;
 697
 698         spin_lock_irqsave(&cam->core_enable_disable_lock, flags);
 699
 700         if (atomic_read(&cam->in_reset) != 1)
 701                 goto out;
 702
 703         omap24xxcam_hwinit(cam);
 704
 705         omap24xxcam_sensor_if_enable(cam);
 706
 707         omap24xxcam_sgdma_process(&cam->sgdma);
 708
 709         if (cam->sgdma_in_queue)
 710                 omap24xxcam_core_enable(cam);
 711
 712 out:
 713         atomic_dec(&cam->in_reset);
 714         spin_unlock_irqrestore(&cam->core_enable_disable_lock, flags);
 715 }
 716
 717 static ssize_t
 718 omap24xxcam_streaming_show(struct device *dev, struct device_attribute *attr,
 719                 char *buf)
 720 {
 721         struct omap24xxcam_device *cam = dev_get_drvdata(dev);
 722
 723         return sprintf(buf, "%s\n", cam->streaming ?  "active" : "inactive");
 724 }
 725 static DEVICE_ATTR(streaming, S_IRUGO, omap24xxcam_streaming_show, NULL);
 726
 727 /*
 728  * Stop capture and restart it. I.e. reset the camera during use.
 729  */
 730 static void omap24xxcam_reset(struct omap24xxcam_device *cam)
 731 {
 732         omap24xxcam_capture_stop(cam);
 733         omap24xxcam_capture_cont(cam);
 734 }
 735
 736 /*
 737  * The main interrupt handler.
 738  */
 739 static irqreturn_t omap24xxcam_isr(int irq, void *arg)
 740 {
 741         struct omap24xxcam_device *cam = (struct omap24xxcam_device *)arg;
 742         u32 irqstatus;
 743         unsigned int irqhandled = 0;
 744
 745         irqstatus = omap24xxcam_reg_in(cam->mmio_base, CAM_IRQSTATUS);
 746
 747         if (irqstatus &
 748             (CAM_IRQSTATUS_DMA_IRQ2 | CAM_IRQSTATUS_DMA_IRQ1
 749              | CAM_IRQSTATUS_DMA_IRQ0)) {
 750                 omap24xxcam_dma_isr(&cam->sgdma.dma);
 751                 irqhandled = 1;
 752         }
 753         if (irqstatus & CAM_IRQSTATUS_CC_IRQ) {
 754                 omap24xxcam_core_isr(cam);
 755                 irqhandled = 1;
 756         }
 757         if (irqstatus & CAM_IRQSTATUS_MMU_IRQ)
 758                 dev_err(cam->dev, "unhandled camera MMU interrupt!\n");
 759
 760         return IRQ_RETVAL(irqhandled);
 761 }
 762
 763 /*
 764  *
 765  * Sensor handling.
 766  *
 767  */
 768
 769 /*
 770  * Enable the external sensor interface. Try to negotiate interface
 771  * parameters with the sensor and start using the new ones. The calls
 772  * to sensor_if_enable and sensor_if_disable need not to be balanced.
 773  */
 774 static int omap24xxcam_sensor_if_enable(struct omap24xxcam_device *cam)
 775 {
 776         int rval;
 777         struct v4l2_ifparm p;
 778
 779         rval = vidioc_int_g_ifparm(cam->sdev, &p);
 780         if (rval) {
 781                 dev_err(cam->dev, "vidioc_int_g_ifparm failed with %d\n", rval);
 782                 return rval;
 783         }
 784
 785         cam->if_type = p.if_type;
 786
 787         cam->cc_ctrl = CC_CTRL_CC_EN;
 788
 789         switch (p.if_type) {
 790         case V4L2_IF_TYPE_BT656:
 791                 if (p.u.bt656.frame_start_on_rising_vs)
 792                         cam->cc_ctrl |= CC_CTRL_NOBT_SYNCHRO;
 793                 if (p.u.bt656.bt_sync_correct)
 794                         cam->cc_ctrl |= CC_CTRL_BT_CORRECT;
 795                 if (p.u.bt656.swap)
 796                         cam->cc_ctrl |= CC_CTRL_PAR_ORDERCAM;
 797                 if (p.u.bt656.latch_clk_inv)
 798                         cam->cc_ctrl |= CC_CTRL_PAR_CLK_POL;
 799                 if (p.u.bt656.nobt_hs_inv)
 800                         cam->cc_ctrl |= CC_CTRL_NOBT_HS_POL;
 801                 if (p.u.bt656.nobt_vs_inv)
 802                         cam->cc_ctrl |= CC_CTRL_NOBT_VS_POL;
 803
 804                 switch (p.u.bt656.mode) {
 805                 case V4L2_IF_TYPE_BT656_MODE_NOBT_8BIT:
 806                         cam->cc_ctrl |= CC_CTRL_PAR_MODE_NOBT8;
 807                         break;
 808                 case V4L2_IF_TYPE_BT656_MODE_NOBT_10BIT:
 809                         cam->cc_ctrl |= CC_CTRL_PAR_MODE_NOBT10;
 810                         break;
 811                 case V4L2_IF_TYPE_BT656_MODE_NOBT_12BIT:
 812                         cam->cc_ctrl |= CC_CTRL_PAR_MODE_NOBT12;
 813                         break;
 814                 case V4L2_IF_TYPE_BT656_MODE_BT_8BIT:
 815                         cam->cc_ctrl |= CC_CTRL_PAR_MODE_BT8;
 816                         break;
 817                 case V4L2_IF_TYPE_BT656_MODE_BT_10BIT:
 818                         cam->cc_ctrl |= CC_CTRL_PAR_MODE_BT10;
 819                         break;
 820                 default:
 821                         dev_err(cam->dev,
 822                                 "bt656 interface mode %d not supported\n",
 823                                 p.u.bt656.mode);
 824                         return -EINVAL;
 825                 }
 826                 /*
 827                  * The clock rate that the sensor wants has changed.
 828                  * We have to adjust the xclk from OMAP 2 side to
 829                  * match the sensor's wish as closely as possible.
 830                  */
 831                 if (p.u.bt656.clock_curr != cam->if_u.bt656.xclk) {
 832                         u32 xclk = p.u.bt656.clock_curr;
 833                         u32 divisor;
 834
 835                         if (xclk == 0)
 836                                 return -EINVAL;
 837
 838                         if (xclk > CAM_MCLK)
 839                                 xclk = CAM_MCLK;
 840
 841                         divisor = CAM_MCLK / xclk;
 842                         if (divisor * xclk < CAM_MCLK)
 843                                 divisor++;
 844                         if (CAM_MCLK / divisor < p.u.bt656.clock_min
 845                             && divisor > 1)
 846                                 divisor--;
 847                         if (divisor > 30)
 848                                 divisor = 30;
 849
 850                         xclk = CAM_MCLK / divisor;
 851
 852                         if (xclk < p.u.bt656.clock_min
 853                             || xclk > p.u.bt656.clock_max)
 854                                 return -EINVAL;
 855
 856                         cam->if_u.bt656.xclk = xclk;
 857                 }
 858                 omap24xxcam_core_xclk_set(cam, cam->if_u.bt656.xclk);
 859                 break;
 860         default:
 861                 /* FIXME: how about other interfaces? */
 862                 dev_err(cam->dev, "interface type %d not supported\n",
 863                         p.if_type);
 864                 return -EINVAL;
 865         }
 866
 867         return 0;
 868 }
 869
 870 static void omap24xxcam_sensor_if_disable(const struct omap24xxcam_device *cam)
 871 {
 872         switch (cam->if_type) {
 873         case V4L2_IF_TYPE_BT656:
 874                 omap24xxcam_core_xclk_set(cam, 0);
 875                 break;
 876         }
 877 }
 878
 879 /*
 880  * Initialise the sensor hardware.
 881  */
 882 static int omap24xxcam_sensor_init(struct omap24xxcam_device *cam)
 883 {
 884         int err = 0;
 885         struct v4l2_int_device *sdev = cam->sdev;
 886
 887         omap24xxcam_clock_on(cam);
 888         err = omap24xxcam_sensor_if_enable(cam);
 889         if (err) {
 890                 dev_err(cam->dev, "sensor interface could not be enabled at "
 891                         "initialisation, %d\n", err);
 892                 cam->sdev = NULL;
 893                 goto out;
 894         }
 895
 896         /* power up sensor during sensor initialization */
 897         vidioc_int_s_power(sdev, 1);
 898
 899         err = vidioc_int_dev_init(sdev);
 900         if (err) {
 901                 dev_err(cam->dev, "cannot initialize sensor, error %d\n", err);
 902                 /* Sensor init failed --- it's nonexistent to us! */
 903                 cam->sdev = NULL;
 904                 goto out;
 905         }
 906
 907         dev_info(cam->dev, "sensor is %s\n", sdev->name);
 908
 909 out:
 910         omap24xxcam_sensor_if_disable(cam);
 911         omap24xxcam_clock_off(cam);
 912
 913         vidioc_int_s_power(sdev, 0);
 914
 915         return err;
 916 }
 917
 918 static void omap24xxcam_sensor_exit(struct omap24xxcam_device *cam)
 919 {
 920         if (cam->sdev)
 921                 vidioc_int_dev_exit(cam->sdev);
 922 }
 923
 924 static void omap24xxcam_sensor_disable(struct omap24xxcam_device *cam)
 925 {
 926         omap24xxcam_sensor_if_disable(cam);
 927         omap24xxcam_clock_off(cam);
 928         vidioc_int_s_power(cam->sdev, 0);
 929 }
 930
 931 /*
 932  * Power-up and configure camera sensor. It's ready for capturing now.
 933  */
 934 static int omap24xxcam_sensor_enable(struct omap24xxcam_device *cam)
 935 {
 936         int rval;
 937
 938         omap24xxcam_clock_on(cam);
 939
 940         omap24xxcam_sensor_if_enable(cam);
 941
 942         rval = vidioc_int_s_power(cam->sdev, 1);
 943         if (rval)
 944                 goto out;
 945
 946         rval = vidioc_int_init(cam->sdev);
 947         if (rval)
 948                 goto out;
 949
 950         return 0;
 951
 952 out:
 953         omap24xxcam_sensor_disable(cam);
 954
 955         return rval;
 956 }
 957
 958 static void omap24xxcam_sensor_reset_work(struct work_struct *work)
 959 {
 960         struct omap24xxcam_device *cam =
 961                 container_of(work, struct omap24xxcam_device,
 962                              sensor_reset_work);
 963
 964         if (atomic_read(&cam->reset_disable))
 965                 return;
 966
 967         omap24xxcam_capture_stop(cam);
 968
 969         if (vidioc_int_reset(cam->sdev) == 0) {
 970                 vidioc_int_init(cam->sdev);
 971         } else {
 972                 /* Can't reset it by vidioc_int_reset. */
 973                 omap24xxcam_sensor_disable(cam);
 974                 omap24xxcam_sensor_enable(cam);
 975         }
 976
 977         omap24xxcam_capture_cont(cam);
 978 }
 979
 980 /*
 981  *
 982  * IOCTL interface.
 983  *
 984  */
 985
 986 static int vidioc_querycap(struct file *file, void *fh,
 987                            struct v4l2_capability *cap)
 988 {
 989         struct omap24xxcam_fh *ofh = fh;
 990         struct omap24xxcam_device *cam = ofh->cam;
 991
 992         strlcpy(cap->driver, CAM_NAME, sizeof(cap->driver));
 993         strlcpy(cap->card, cam->vfd->name, sizeof(cap->card));
 994         cap->version = OMAP24XXCAM_VERSION;
 995         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
 996
 997         return 0;
 998 }
 999
1000 static int vidioc_enum_fmt_vid_cap(struct file *file, void *fh,
1001                                    struct v4l2_fmtdesc *f)
1002 {
1003         struct omap24xxcam_fh *ofh = fh;
1004         struct omap24xxcam_device *cam = ofh->cam;
1005         int rval;
1006
1007         rval = vidioc_int_enum_fmt_cap(cam->sdev, f);
1008
1009         return rval;
1010 }
1011
1012 static int vidioc_g_fmt_vid_cap(struct file *file, void *fh,
1013                                 struct v4l2_format *f)
1014 {
1015         struct omap24xxcam_fh *ofh = fh;
1016         struct omap24xxcam_device *cam = ofh->cam;
1017         int rval;
1018
1019         mutex_lock(&cam->mutex);
1020         rval = vidioc_int_g_fmt_cap(cam->sdev, f);
1021         mutex_unlock(&cam->mutex);
1022
1023         return rval;
1024 }
1025
1026 static int vidioc_s_fmt_vid_cap(struct file *file, void *fh,
1027                                 struct v4l2_format *f)
1028 {
1029         struct omap24xxcam_fh *ofh = fh;
1030         struct omap24xxcam_device *cam = ofh->cam;
1031         int rval;
1032
1033         mutex_lock(&cam->mutex);
1034         if (cam->streaming) {
1035                 rval = -EBUSY;
1036                 goto out;
1037         }
1038
1039         rval = vidioc_int_s_fmt_cap(cam->sdev, f);
1040
1041 out:
1042         mutex_unlock(&cam->mutex);
1043
1044         if (!rval) {
1045                 mutex_lock(&ofh->vbq.vb_lock);
1046                 ofh->pix = f->fmt.pix;
1047                 mutex_unlock(&ofh->vbq.vb_lock);
1048         }
1049
1050         memset(f, 0, sizeof(*f));
1051         vidioc_g_fmt_vid_cap(file, fh, f);
1052
1053         return rval;
1054 }
1055
1056 static int vidioc_try_fmt_vid_cap(struct file *file, void *fh,
1057                                   struct v4l2_format *f)
1058 {
1059         struct omap24xxcam_fh *ofh = fh;
1060         struct omap24xxcam_device *cam = ofh->cam;
1061         int rval;
1062
1063         mutex_lock(&cam->mutex);
1064         rval = vidioc_int_try_fmt_cap(cam->sdev, f);
1065         mutex_unlock(&cam->mutex);
1066
1067         return rval;
1068 }
1069
1070 static int vidioc_reqbufs(struct file *file, void *fh,
1071                           struct v4l2_requestbuffers *b)
1072 {
1073         struct omap24xxcam_fh *ofh = fh;
1074         struct omap24xxcam_device *cam = ofh->cam;
1075         int rval;
1076
1077         mutex_lock(&cam->mutex);
1078         if (cam->streaming) {
1079                 mutex_unlock(&cam->mutex);
1080                 return -EBUSY;
1081         }
1082
1083         omap24xxcam_vbq_free_mmap_buffers(&ofh->vbq);
1084         mutex_unlock(&cam->mutex);
1085
1086         rval = videobuf_reqbufs(&ofh->vbq, b);
1087
1088         /*
1089          * Either videobuf_reqbufs failed or the buffers are not
1090          * memory-mapped (which would need special attention).
1091          */
1092         if (rval < 0 || b->memory != V4L2_MEMORY_MMAP)
1093                 goto out;
1094
1095         rval = omap24xxcam_vbq_alloc_mmap_buffers(&ofh->vbq, rval);
1096         if (rval)
1097                 omap24xxcam_vbq_free_mmap_buffers(&ofh->vbq);
1098
1099 out:
1100         return rval;
1101 }
1102
1103 static int vidioc_querybuf(struct file *file, void *fh,
1104                            struct v4l2_buffer *b)
1105 {
1106         struct omap24xxcam_fh *ofh = fh;
1107
1108         return videobuf_querybuf(&ofh->vbq, b);
1109 }
1110
1111 static int vidioc_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
1112 {
1113         struct omap24xxcam_fh *ofh = fh;
1114
1115         return videobuf_qbuf(&ofh->vbq, b);
1116 }
1117
1118 static int vidioc_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
1119 {
1120         struct omap24xxcam_fh *ofh = fh;
1121         struct omap24xxcam_device *cam = ofh->cam;
1122         struct videobuf_buffer *vb;
1123         int rval;
1124
1125 videobuf_dqbuf_again:
1126         rval = videobuf_dqbuf(&ofh->vbq, b, file->f_flags & O_NONBLOCK);
1127         if (rval)
1128                 goto out;
1129
1130         vb = ofh->vbq.bufs[b->index];
1131
1132         mutex_lock(&cam->mutex);
1133         /* _needs_reset returns -EIO if reset is required. */
1134         rval = vidioc_int_g_needs_reset(cam->sdev, (void *)vb->baddr);
1135         mutex_unlock(&cam->mutex);
1136         if (rval == -EIO)
1137                 schedule_work(&cam->sensor_reset_work);
1138         else
1139                 rval = 0;
1140
1141 out:
1142         /*
1143          * This is a hack. We don't want to show -EIO to the user
1144          * space. Requeue the buffer and try again if we're not doing
1145          * this in non-blocking mode.
1146          */
1147         if (rval == -EIO) {
1148                 videobuf_qbuf(&ofh->vbq, b);
1149                 if (!(file->f_flags & O_NONBLOCK))
1150                         goto videobuf_dqbuf_again;
1151                 /*
1152                  * We don't have a videobuf_buffer now --- maybe next
1153                  * time...
1154                  */
1155                 rval = -EAGAIN;
1156         }
1157
1158         return rval;
1159 }
1160
1161 static int vidioc_streamon(struct file *file, void *fh, enum v4l2_buf_type i)
1162 {
1163         struct omap24xxcam_fh *ofh = fh;
1164         struct omap24xxcam_device *cam = ofh->cam;
1165         int rval;
1166
1167         mutex_lock(&cam->mutex);
1168         if (cam->streaming) {
1169                 rval = -EBUSY;
1170                 goto out;
1171         }
1172
1173         rval = omap24xxcam_sensor_if_enable(cam);
1174         if (rval) {
1175                 dev_dbg(cam->dev, "vidioc_int_g_ifparm failed\n");
1176                 goto out;
1177         }
1178
1179         rval = videobuf_streamon(&ofh->vbq);
1180         if (!rval) {
1181                 cam->streaming = file;
1182                 sysfs_notify(&cam->dev->kobj, NULL, "streaming");
1183         }
1184
1185 out:
1186         mutex_unlock(&cam->mutex);
1187
1188         return rval;
1189 }
1190
1191 static int vidioc_streamoff(struct file *file, void *fh, enum v4l2_buf_type i)
1192 {
1193         struct omap24xxcam_fh *ofh = fh;
1194         struct omap24xxcam_device *cam = ofh->cam;
1195         struct videobuf_queue *q = &ofh->vbq;
1196         int rval;
1197
1198         atomic_inc(&cam->reset_disable);
1199
1200         flush_scheduled_work();
1201
1202         rval = videobuf_streamoff(q);
1203         if (!rval) {
1204                 mutex_lock(&cam->mutex);
1205                 cam->streaming = NULL;
1206                 mutex_unlock(&cam->mutex);
1207                 sysfs_notify(&cam->dev->kobj, NULL, "streaming");
1208         }
1209
1210         atomic_dec(&cam->reset_disable);
1211
1212         return rval;
1213 }
1214
1215 static int vidioc_enum_input(struct file *file, void *fh,
1216                              struct v4l2_input *inp)
1217 {
1218         if (inp->index > 0)
1219                 return -EINVAL;
1220
1221         strlcpy(inp->name, "camera", sizeof(inp->name));
1222         inp->type = V4L2_INPUT_TYPE_CAMERA;
1223
1224         return 0;
1225 }
1226
1227 static int vidioc_g_input(struct file *file, void *fh, unsigned int *i)
1228 {
1229         *i = 0;
1230
1231         return 0;
1232 }
1233
1234 static int vidioc_s_input(struct file *file, void *fh, unsigned int i)
1235 {
1236         if (i > 0)
1237                 return -EINVAL;
1238
1239         return 0;
1240 }
1241
1242 static int vidioc_queryctrl(struct file *file, void *fh,
1243                             struct v4l2_queryctrl *a)
1244 {
1245         struct omap24xxcam_fh *ofh = fh;
1246         struct omap24xxcam_device *cam = ofh->cam;
1247         int rval;
1248
1249         rval = vidioc_int_queryctrl(cam->sdev, a);
1250
1251         return rval;
1252 }
1253
1254 static int vidioc_g_ctrl(struct file *file, void *fh,
1255                          struct v4l2_control *a)
1256 {
1257         struct omap24xxcam_fh *ofh = fh;
1258         struct omap24xxcam_device *cam = ofh->cam;
1259         int rval;
1260
1261         mutex_lock(&cam->mutex);
1262         rval = vidioc_int_g_ctrl(cam->sdev, a);
1263         mutex_unlock(&cam->mutex);
1264
1265         return rval;
1266 }
1267
1268 static int vidioc_s_ctrl(struct file *file, void *fh,
1269                          struct v4l2_control *a)
1270 {
1271         struct omap24xxcam_fh *ofh = fh;
1272         struct omap24xxcam_device *cam = ofh->cam;
1273         int rval;
1274
1275         mutex_lock(&cam->mutex);
1276         rval = vidioc_int_s_ctrl(cam->sdev, a);
1277         mutex_unlock(&cam->mutex);
1278
1279         return rval;
1280 }
1281
1282 static int vidioc_g_parm(struct file *file, void *fh,
1283                          struct v4l2_streamparm *a) {
1284         struct omap24xxcam_fh *ofh = fh;
1285         struct omap24xxcam_device *cam = ofh->cam;
1286         int rval;
1287
1288         mutex_lock(&cam->mutex);
1289         rval = vidioc_int_g_parm(cam->sdev, a);
1290         mutex_unlock(&cam->mutex);
1291
1292         return rval;
1293 }
1294
1295 static int vidioc_s_parm(struct file *file, void *fh,
1296                          struct v4l2_streamparm *a)
1297 {
1298         struct omap24xxcam_fh *ofh = fh;
1299         struct omap24xxcam_device *cam = ofh->cam;
1300         struct v4l2_streamparm old_streamparm;
1301         int rval;
1302
1303         mutex_lock(&cam->mutex);
1304         if (cam->streaming) {
1305                 rval = -EBUSY;
1306                 goto out;
1307         }
1308
1309         old_streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1310         rval = vidioc_int_g_parm(cam->sdev, &old_streamparm);
1311         if (rval)
1312                 goto out;
1313
1314         rval = vidioc_int_s_parm(cam->sdev, a);
1315         if (rval)
1316                 goto out;
1317
1318         rval = omap24xxcam_sensor_if_enable(cam);
1319         /*
1320          * Revert to old streaming parameters if enabling sensor
1321          * interface with the new ones failed.
1322          */
1323         if (rval)
1324                 vidioc_int_s_parm(cam->sdev, &old_streamparm);
1325
1326 out:
1327         mutex_unlock(&cam->mutex);
1328
1329         return rval;
1330 }
1331
1332 /*
1333  *
1334  * File operations.
1335  *
1336  */
1337
1338 static unsigned int omap24xxcam_poll(struct file *file,
1339                                      struct poll_table_struct *wait)
1340 {
1341         struct omap24xxcam_fh *fh = file->private_data;
1342         struct omap24xxcam_device *cam = fh->cam;
1343         struct videobuf_buffer *vb;
1344
1345         mutex_lock(&cam->mutex);
1346         if (cam->streaming != file) {
1347                 mutex_unlock(&cam->mutex);
1348                 return POLLERR;
1349         }
1350         mutex_unlock(&cam->mutex);
1351
1352         mutex_lock(&fh->vbq.vb_lock);
1353         if (list_empty(&fh->vbq.stream)) {
1354                 mutex_unlock(&fh->vbq.vb_lock);
1355                 return POLLERR;
1356         }
1357         vb = list_entry(fh->vbq.stream.next, struct videobuf_buffer, stream);
1358         mutex_unlock(&fh->vbq.vb_lock);
1359
1360         poll_wait(file, &vb->done, wait);
1361
1362         if (vb->state == VIDEOBUF_DONE || vb->state == VIDEOBUF_ERROR)
1363                 return POLLIN | POLLRDNORM;
1364
1365         return 0;
1366 }
1367
1368 static int omap24xxcam_mmap_buffers(struct file *file,
1369                                     struct vm_area_struct *vma)
1370 {
1371         struct omap24xxcam_fh *fh = file->private_data;
1372         struct omap24xxcam_device *cam = fh->cam;
1373         struct videobuf_queue *vbq = &fh->vbq;
1374         unsigned int first, last, size, i, j;
1375         int err = 0;
1376
1377         mutex_lock(&cam->mutex);
1378         if (cam->streaming) {
1379                 mutex_unlock(&cam->mutex);
1380                 return -EBUSY;
1381         }
1382         mutex_unlock(&cam->mutex);
1383         mutex_lock(&vbq->vb_lock);
1384
1385         /* look for first buffer to map */
1386         for (first = 0; first < VIDEO_MAX_FRAME; first++) {
1387                 if (NULL == vbq->bufs[first])
1388                         continue;
1389                 if (V4L2_MEMORY_MMAP != vbq->bufs[first]->memory)
1390                         continue;
1391                 if (vbq->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
1392                         break;
1393         }
1394
1395         /* look for last buffer to map */
1396         for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
1397                 if (NULL == vbq->bufs[last])
1398                         continue;
1399                 if (V4L2_MEMORY_MMAP != vbq->bufs[last]->memory)
1400                         continue;
1401                 size += vbq->bufs[last]->bsize;
1402                 if (size == (vma->vm_end - vma->vm_start))
1403                         break;
1404         }
1405
1406         size = 0;
1407         for (i = first; i <= last; i++) {
1408                 struct videobuf_dmabuf *dma = videobuf_to_dma(vbq->bufs[i]);
1409
1410                 for (j = 0; j < dma->sglen; j++) {
1411                         err = remap_pfn_range(
1412                                 vma, vma->vm_start + size,
1413                                 page_to_pfn(sg_page(&dma->sglist[j])),
1414                                 sg_dma_len(&dma->sglist[j]), vma->vm_page_prot);
1415                         if (err)
1416                                 goto out;
1417                         size += sg_dma_len(&dma->sglist[j]);
1418                 }
1419         }
1420
1421 out:
1422         mutex_unlock(&vbq->vb_lock);
1423
1424         return err;
1425 }
1426
1427 static int omap24xxcam_mmap(struct file *file, struct vm_area_struct *vma)
1428 {
1429         struct omap24xxcam_fh *fh = file->private_data;
1430         int rval;
1431
1432         /* let the video-buf mapper check arguments and set-up structures */
1433         rval = videobuf_mmap_mapper(&fh->vbq, vma);
1434         if (rval)
1435                 return rval;
1436
1437         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1438
1439         /* do mapping to our allocated buffers */
1440         rval = omap24xxcam_mmap_buffers(file, vma);
1441         /*
1442          * In case of error, free vma->vm_private_data allocated by
1443          * videobuf_mmap_mapper.
1444          */
1445         if (rval)
1446                 kfree(vma->vm_private_data);
1447
1448         return rval;
1449 }
1450
1451 static int omap24xxcam_open(struct file *file)
1452 {
1453         int minor = video_devdata(file)->minor;
1454         struct omap24xxcam_device *cam = omap24xxcam.priv;
1455         struct omap24xxcam_fh *fh;
1456         struct v4l2_format format;
1457
1458         if (!cam || !cam->vfd || (cam->vfd->minor != minor))
1459                 return -ENODEV;
1460
1461         fh = kzalloc(sizeof(*fh), GFP_KERNEL);
1462         if (fh == NULL)
1463                 return -ENOMEM;
1464
1465         mutex_lock(&cam->mutex);
1466         if (cam->sdev == NULL || !try_module_get(cam->sdev->module)) {
1467                 mutex_unlock(&cam->mutex);
1468                 goto out_try_module_get;
1469         }
1470
1471         if (atomic_inc_return(&cam->users) == 1) {
1472                 omap24xxcam_hwinit(cam);
1473                 if (omap24xxcam_sensor_enable(cam)) {
1474                         mutex_unlock(&cam->mutex);
1475                         goto out_omap24xxcam_sensor_enable;
1476                 }
1477         }
1478         mutex_unlock(&cam->mutex);
1479
1480         fh->cam = cam;
1481         mutex_lock(&cam->mutex);
1482         vidioc_int_g_fmt_cap(cam->sdev, &format);
1483         mutex_unlock(&cam->mutex);
1484         /* FIXME: how about fh->pix when there are more users? */
1485         fh->pix = format.fmt.pix;
1486
1487         file->private_data = fh;
1488
1489         spin_lock_init(&fh->vbq_lock);
1490
1491         videobuf_queue_sg_init(&fh->vbq, &omap24xxcam_vbq_ops, NULL,
1492                                 &fh->vbq_lock, V4L2_BUF_TYPE_VIDEO_CAPTURE,
1493                                 V4L2_FIELD_NONE,
1494                                 sizeof(struct videobuf_buffer), fh);
1495
1496         return 0;
1497
1498 out_omap24xxcam_sensor_enable:
1499         omap24xxcam_poweron_reset(cam);
1500         module_put(cam->sdev->module);
1501
1502 out_try_module_get:
1503         kfree(fh);
1504
1505         return -ENODEV;
1506 }
1507
1508 static int omap24xxcam_release(struct file *file)
1509 {
1510         struct omap24xxcam_fh *fh = file->private_data;
1511         struct omap24xxcam_device *cam = fh->cam;
1512
1513         atomic_inc(&cam->reset_disable);
1514
1515         flush_scheduled_work();
1516
1517         /* stop streaming capture */
1518         videobuf_streamoff(&fh->vbq);
1519
1520         mutex_lock(&cam->mutex);
1521         if (cam->streaming == file) {
1522                 cam->streaming = NULL;
1523                 mutex_unlock(&cam->mutex);
1524                 sysfs_notify(&cam->dev->kobj, NULL, "streaming");
1525         } else {
1526                 mutex_unlock(&cam->mutex);
1527         }
1528
1529         atomic_dec(&cam->reset_disable);
1530
1531         omap24xxcam_vbq_free_mmap_buffers(&fh->vbq);
1532
1533         /*
1534          * Make sure the reset work we might have scheduled is not
1535          * pending! It may be run *only* if we have users. (And it may
1536          * not be scheduled anymore since streaming is already
1537          * disabled.)
1538          */
1539         flush_scheduled_work();
1540
1541         mutex_lock(&cam->mutex);
1542         if (atomic_dec_return(&cam->users) == 0) {
1543                 omap24xxcam_sensor_disable(cam);
1544                 omap24xxcam_poweron_reset(cam);
1545         }
1546         mutex_unlock(&cam->mutex);
1547
1548         file->private_data = NULL;
1549
1550         module_put(cam->sdev->module);
1551         kfree(fh);
1552
1553         return 0;
1554 }
1555
1556 static struct v4l2_file_operations omap24xxcam_fops = {
1557         .ioctl   = video_ioctl2,
1558         .poll    = omap24xxcam_poll,
1559         .mmap    = omap24xxcam_mmap,
1560         .open    = omap24xxcam_open,
1561         .release = omap24xxcam_release,
1562 };
1563
1564 /*
1565  *
1566  * Power management.
1567  *
1568  */
1569
1570 #ifdef CONFIG_PM
1571 static int omap24xxcam_suspend(struct platform_device *pdev, pm_message_t state)
1572 {
1573         struct omap24xxcam_device *cam = platform_get_drvdata(pdev);
1574
1575         if (atomic_read(&cam->users) == 0)
1576                 return 0;
1577
1578         if (!atomic_read(&cam->reset_disable))
1579                 omap24xxcam_capture_stop(cam);
1580
1581         omap24xxcam_sensor_disable(cam);
1582         omap24xxcam_poweron_reset(cam);
1583
1584         return 0;
1585 }
1586
1587 static int omap24xxcam_resume(struct platform_device *pdev)
1588 {
1589         struct omap24xxcam_device *cam = platform_get_drvdata(pdev);
1590
1591         if (atomic_read(&cam->users) == 0)
1592                 return 0;
1593
1594         omap24xxcam_hwinit(cam);
1595         omap24xxcam_sensor_enable(cam);
1596
1597         if (!atomic_read(&cam->reset_disable))
1598                 omap24xxcam_capture_cont(cam);
1599
1600         return 0;
1601 }
1602 #endif /* CONFIG_PM */
1603
1604 static const struct v4l2_ioctl_ops omap24xxcam_ioctl_fops = {
1605         .vidioc_querycap        = vidioc_querycap,
1606         .vidioc_enum_fmt_vid_cap        = vidioc_enum_fmt_vid_cap,
1607         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
1608         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
1609         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1610         .vidioc_reqbufs         = vidioc_reqbufs,
1611         .vidioc_querybuf        = vidioc_querybuf,
1612         .vidioc_qbuf            = vidioc_qbuf,
1613         .vidioc_dqbuf           = vidioc_dqbuf,
1614         .vidioc_streamon        = vidioc_streamon,
1615         .vidioc_streamoff       = vidioc_streamoff,
1616         .vidioc_enum_input      = vidioc_enum_input,
1617         .vidioc_g_input         = vidioc_g_input,
1618         .vidioc_s_input         = vidioc_s_input,
1619         .vidioc_queryctrl       = vidioc_queryctrl,
1620         .vidioc_g_ctrl          = vidioc_g_ctrl,
1621         .vidioc_s_ctrl          = vidioc_s_ctrl,
1622         .vidioc_g_parm          = vidioc_g_parm,
1623         .vidioc_s_parm          = vidioc_s_parm,
1624 };
1625
1626 /*
1627  *
1628  * Camera device (i.e. /dev/video).
1629  *
1630  */
1631
1632 static int omap24xxcam_device_register(struct v4l2_int_device *s)
1633 {
1634         struct omap24xxcam_device *cam = s->u.slave->master->priv;
1635         struct video_device *vfd;
1636         int rval;
1637
1638         /* We already have a slave. */
1639         if (cam->sdev)
1640                 return -EBUSY;
1641
1642         cam->sdev = s;
1643
1644         if (device_create_file(cam->dev, &dev_attr_streaming) != 0) {
1645                 dev_err(cam->dev, "could not register sysfs entry\n");
1646                 rval = -EBUSY;
1647                 goto err;
1648         }
1649
1650         /* initialize the video_device struct */
1651         vfd = cam->vfd = video_device_alloc();
1652         if (!vfd) {
1653                 dev_err(cam->dev, "could not allocate video device struct\n");
1654                 rval = -ENOMEM;
1655                 goto err;
1656         }
1657         vfd->release = video_device_release;
1658
1659         vfd->parent = cam->dev;
1660
1661         strlcpy(vfd->name, CAM_NAME, sizeof(vfd->name));
1662         vfd->fops                = &omap24xxcam_fops;
1663         vfd->minor               = -1;
1664         vfd->ioctl_ops           = &omap24xxcam_ioctl_fops;
1665
1666         omap24xxcam_hwinit(cam);
1667
1668         rval = omap24xxcam_sensor_init(cam);
1669         if (rval)
1670                 goto err;
1671
1672         if (video_register_device(vfd, VFL_TYPE_GRABBER, video_nr) < 0) {
1673                 dev_err(cam->dev, "could not register V4L device\n");
1674                 vfd->minor = -1;
1675                 rval = -EBUSY;
1676                 goto err;
1677         }
1678
1679         omap24xxcam_poweron_reset(cam);
1680
1681         dev_info(cam->dev, "registered device video%d\n", vfd->minor);
1682
1683         return 0;
1684
1685 err:
1686         omap24xxcam_device_unregister(s);
1687
1688         return rval;
1689 }
1690
1691 static void omap24xxcam_device_unregister(struct v4l2_int_device *s)
1692 {
1693         struct omap24xxcam_device *cam = s->u.slave->master->priv;
1694
1695         omap24xxcam_sensor_exit(cam);
1696
1697         if (cam->vfd) {
1698                 if (cam->vfd->minor == -1) {
1699                         /*
1700                          * The device was never registered, so release the
1701                          * video_device struct directly.
1702                          */
1703                         video_device_release(cam->vfd);
1704                 } else {
1705                         /*
1706                          * The unregister function will release the
1707                          * video_device struct as well as
1708                          * unregistering it.
1709                          */
1710                         video_unregister_device(cam->vfd);
1711                 }
1712                 cam->vfd = NULL;
1713         }
1714
1715         device_remove_file(cam->dev, &dev_attr_streaming);
1716
1717         cam->sdev = NULL;
1718 }
1719
1720 static struct v4l2_int_master omap24xxcam_master = {
1721         .attach = omap24xxcam_device_register,
1722         .detach = omap24xxcam_device_unregister,
1723 };
1724
1725 static struct v4l2_int_device omap24xxcam = {
1726         .module = THIS_MODULE,
1727         .name   = CAM_NAME,
1728         .type   = v4l2_int_type_master,
1729         .u      = {
1730                 .master = &omap24xxcam_master
1731         },
1732 };
1733
1734 /*
1735  *
1736  * Driver initialisation and deinitialisation.
1737  *
1738  */
1739
1740 static int __init omap24xxcam_probe(struct platform_device *pdev)
1741 {
1742         struct omap24xxcam_device *cam;
1743         struct resource *mem;
1744         int irq;
1745
1746         cam = kzalloc(sizeof(*cam), GFP_KERNEL);
1747         if (!cam) {
1748                 dev_err(&pdev->dev, "could not allocate memory\n");
1749                 goto err;
1750         }
1751
1752         platform_set_drvdata(pdev, cam);
1753
1754         cam->dev = &pdev->dev;
1755
1756         /*
1757          * Impose a lower limit on the amount of memory allocated for
1758          * capture. We require at least enough memory to double-buffer
1759          * QVGA (300KB).
1760          */
1761         if (capture_mem < 320 * 240 * 2 * 2)
1762                 capture_mem = 320 * 240 * 2 * 2;
1763         cam->capture_mem = capture_mem;
1764
1765         /* request the mem region for the camera registers */
1766         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1767         if (!mem) {
1768                 dev_err(cam->dev, "no mem resource?\n");
1769                 goto err;
1770         }
1771         if (!request_mem_region(mem->start, (mem->end - mem->start) + 1,
1772                                 pdev->name)) {
1773                 dev_err(cam->dev,
1774                         "cannot reserve camera register I/O region\n");
1775                 goto err;
1776         }
1777         cam->mmio_base_phys = mem->start;
1778         cam->mmio_size = (mem->end - mem->start) + 1;
1779
1780         /* map the region */
1781         cam->mmio_base = (unsigned long)
1782                 ioremap_nocache(cam->mmio_base_phys, cam->mmio_size);
1783         if (!cam->mmio_base) {
1784                 dev_err(cam->dev, "cannot map camera register I/O region\n");
1785                 goto err;
1786         }
1787
1788         irq = platform_get_irq(pdev, 0);
1789         if (irq <= 0) {
1790                 dev_err(cam->dev, "no irq for camera?\n");
1791                 goto err;
1792         }
1793
1794         /* install the interrupt service routine */
1795         if (request_irq(irq, omap24xxcam_isr, 0, CAM_NAME, cam)) {
1796                 dev_err(cam->dev,
1797                         "could not install interrupt service routine\n");
1798                 goto err;
1799         }
1800         cam->irq = irq;
1801
1802         if (omap24xxcam_clock_get(cam))
1803                 goto err;
1804
1805         INIT_WORK(&cam->sensor_reset_work, omap24xxcam_sensor_reset_work);
1806
1807         mutex_init(&cam->mutex);
1808         spin_lock_init(&cam->core_enable_disable_lock);
1809
1810         omap24xxcam_sgdma_init(&cam->sgdma,
1811                                cam->mmio_base + CAMDMA_REG_OFFSET,
1812                                omap24xxcam_stalled_dma_reset,
1813                                (unsigned long)cam);
1814
1815         omap24xxcam.priv = cam;
1816
1817         if (v4l2_int_device_register(&omap24xxcam))
1818                 goto err;
1819
1820         return 0;
1821
1822 err:
1823         omap24xxcam_remove(pdev);
1824         return -ENODEV;
1825 }
1826
1827 static int omap24xxcam_remove(struct platform_device *pdev)
1828 {
1829         struct omap24xxcam_device *cam = platform_get_drvdata(pdev);
1830
1831         if (!cam)
1832                 return 0;
1833
1834         if (omap24xxcam.priv != NULL)
1835                 v4l2_int_device_unregister(&omap24xxcam);
1836         omap24xxcam.priv = NULL;
1837
1838         omap24xxcam_clock_put(cam);
1839
1840         if (cam->irq) {
1841                 free_irq(cam->irq, cam);
1842                 cam->irq = 0;
1843         }
1844
1845         if (cam->mmio_base) {
1846                 iounmap((void *)cam->mmio_base);
1847                 cam->mmio_base = 0;
1848         }
1849
1850         if (cam->mmio_base_phys) {
1851                 release_mem_region(cam->mmio_base_phys, cam->mmio_size);
1852                 cam->mmio_base_phys = 0;
1853         }
1854
1855         kfree(cam);
1856
1857         return 0;
1858 }
1859
1860 static struct platform_driver omap24xxcam_driver = {
1861         .probe   = omap24xxcam_probe,
1862         .remove  = omap24xxcam_remove,
1863 #ifdef CONFIG_PM
1864         .suspend = omap24xxcam_suspend,
1865         .resume  = omap24xxcam_resume,
1866 #endif
1867         .driver  = {
1868                 .name = CAM_NAME,
1869                 .owner = THIS_MODULE,
1870         },
1871 };
1872
1873 /*
1874  *
1875  * Module initialisation and deinitialisation
1876  *
1877  */
1878
1879 static int __init omap24xxcam_init(void)
1880 {
1881         return platform_driver_register(&omap24xxcam_driver);
1882 }
1883
1884 static void __exit omap24xxcam_cleanup(void)
1885 {
1886         platform_driver_unregister(&omap24xxcam_driver);
1887 }
1888
1889 MODULE_AUTHOR("Sakari Ailus <sakari.ailus@nokia.com>");
1890 MODULE_DESCRIPTION("OMAP24xx Video for Linux camera driver");
1891 MODULE_LICENSE("GPL");
1892 module_param(video_nr, int, 0);
1893 MODULE_PARM_DESC(video_nr,
1894                  "Minor number for video device (-1 ==> auto assign)");
1895 module_param(capture_mem, int, 0);
1896 MODULE_PARM_DESC(capture_mem, "Maximum amount of memory for capture "
1897                  "buffers (default 4800kiB)");
1898
1899 module_init(omap24xxcam_init);
1900 module_exit(omap24xxcam_cleanup);