drivers/media/video/mx1_camera.c

   1 /*
   2  * V4L2 Driver for i.MXL/i.MXL camera (CSI) host
   3  *
   4  * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
   5  * Copyright (C) 2009, Darius Augulis <augulis.darius@gmail.com>
   6  *
   7  * Based on PXA SoC camera driver
   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 version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/clk.h>
  17 #include <linux/delay.h>
  18 #include <linux/device.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/errno.h>
  21 #include <linux/fs.h>
  22 #include <linux/init.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/io.h>
  25 #include <linux/kernel.h>
  26 #include <linux/mm.h>
  27 #include <linux/module.h>
  28 #include <linux/moduleparam.h>
  29 #include <linux/mutex.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/sched.h>
  32 #include <linux/slab.h>
  33 #include <linux/time.h>
  34 #include <linux/version.h>
  35 #include <linux/videodev2.h>
  36
  37 #include <media/soc_camera.h>
  38 #include <media/v4l2-common.h>
  39 #include <media/v4l2-dev.h>
  40 #include <media/videobuf-dma-contig.h>
  41 #include <media/soc_mediabus.h>
  42
  43 #include <asm/dma.h>
  44 #include <asm/fiq.h>
  45 #include <mach/dma-mx1-mx2.h>
  46 #include <mach/hardware.h>
  47 #include <mach/mx1_camera.h>
  48
  49 /*
  50  * CSI registers
  51  */
  52 #define DMA_CCR(x)      (0x8c + ((x) << 6))     /* Control Registers */
  53 #define DMA_DIMR        0x08                    /* Interrupt mask Register */
  54 #define CSICR1          0x00                    /* CSI Control Register 1 */
  55 #define CSISR           0x08                    /* CSI Status Register */
  56 #define CSIRXR          0x10                    /* CSI RxFIFO Register */
  57
  58 #define CSICR1_RXFF_LEVEL(x)    (((x) & 0x3) << 19)
  59 #define CSICR1_SOF_POL          (1 << 17)
  60 #define CSICR1_SOF_INTEN        (1 << 16)
  61 #define CSICR1_MCLKDIV(x)       (((x) & 0xf) << 12)
  62 #define CSICR1_MCLKEN           (1 << 9)
  63 #define CSICR1_FCC              (1 << 8)
  64 #define CSICR1_BIG_ENDIAN       (1 << 7)
  65 #define CSICR1_CLR_RXFIFO       (1 << 5)
  66 #define CSICR1_GCLK_MODE        (1 << 4)
  67 #define CSICR1_DATA_POL         (1 << 2)
  68 #define CSICR1_REDGE            (1 << 1)
  69 #define CSICR1_EN               (1 << 0)
  70
  71 #define CSISR_SFF_OR_INT        (1 << 25)
  72 #define CSISR_RFF_OR_INT        (1 << 24)
  73 #define CSISR_STATFF_INT        (1 << 21)
  74 #define CSISR_RXFF_INT          (1 << 18)
  75 #define CSISR_SOF_INT           (1 << 16)
  76 #define CSISR_DRDY              (1 << 0)
  77
  78 #define VERSION_CODE KERNEL_VERSION(0, 0, 1)
  79 #define DRIVER_NAME "mx1-camera"
  80
  81 #define CSI_IRQ_MASK    (CSISR_SFF_OR_INT | CSISR_RFF_OR_INT | \
  82                         CSISR_STATFF_INT | CSISR_RXFF_INT | CSISR_SOF_INT)
  83
  84 #define CSI_BUS_FLAGS   (SOCAM_MASTER | SOCAM_HSYNC_ACTIVE_HIGH | \
  85                         SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW | \
  86                         SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING | \
  87                         SOCAM_DATA_ACTIVE_HIGH | SOCAM_DATA_ACTIVE_LOW | \
  88                         SOCAM_DATAWIDTH_8)
  89
  90 #define MAX_VIDEO_MEM 16        /* Video memory limit in megabytes */
  91
  92 /*
  93  * Structures
  94  */
  95
  96 /* buffer for one video frame */
  97 struct mx1_buffer {
  98         /* common v4l buffer stuff -- must be first */
  99         struct videobuf_buffer          vb;
 100         enum v4l2_mbus_pixelcode        code;
 101         int                             inwork;
 102 };
 103
 104 /*
 105  * i.MX1/i.MXL is only supposed to handle one camera on its Camera Sensor
 106  * Interface. If anyone ever builds hardware to enable more than
 107  * one camera, they will have to modify this driver too
 108  */
 109 struct mx1_camera_dev {
 110         struct soc_camera_host          soc_host;
 111         struct soc_camera_device        *icd;
 112         struct mx1_camera_pdata         *pdata;
 113         struct mx1_buffer               *active;
 114         struct resource                 *res;
 115         struct clk                      *clk;
 116         struct list_head                capture;
 117
 118         void __iomem                    *base;
 119         int                             dma_chan;
 120         unsigned int                    irq;
 121         unsigned long                   mclk;
 122
 123         spinlock_t                      lock;
 124 };
 125
 126 /*
 127  *  Videobuf operations
 128  */
 129 static int mx1_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
 130                               unsigned int *size)
 131 {
 132         struct soc_camera_device *icd = vq->priv_data;
 133         int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 134                                                 icd->current_fmt->host_fmt);
 135
 136         if (bytes_per_line < 0)
 137                 return bytes_per_line;
 138
 139         *size = bytes_per_line * icd->user_height;
 140
 141         if (!*count)
 142                 *count = 32;
 143
 144         while (*size * *count > MAX_VIDEO_MEM * 1024 * 1024)
 145                 (*count)--;
 146
 147         dev_dbg(icd->dev.parent, "count=%d, size=%d\n", *count, *size);
 148
 149         return 0;
 150 }
 151
 152 static void free_buffer(struct videobuf_queue *vq, struct mx1_buffer *buf)
 153 {
 154         struct soc_camera_device *icd = vq->priv_data;
 155         struct videobuf_buffer *vb = &buf->vb;
 156
 157         BUG_ON(in_interrupt());
 158
 159         dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
 160                 vb, vb->baddr, vb->bsize);
 161
 162         /*
 163          * This waits until this buffer is out of danger, i.e., until it is no
 164          * longer in STATE_QUEUED or STATE_ACTIVE
 165          */
 166         videobuf_waiton(vb, 0, 0);
 167         videobuf_dma_contig_free(vq, vb);
 168
 169         vb->state = VIDEOBUF_NEEDS_INIT;
 170 }
 171
 172 static int mx1_videobuf_prepare(struct videobuf_queue *vq,
 173                 struct videobuf_buffer *vb, enum v4l2_field field)
 174 {
 175         struct soc_camera_device *icd = vq->priv_data;
 176         struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
 177         int ret;
 178         int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 179                                                 icd->current_fmt->host_fmt);
 180
 181         if (bytes_per_line < 0)
 182                 return bytes_per_line;
 183
 184         dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
 185                 vb, vb->baddr, vb->bsize);
 186
 187         /* Added list head initialization on alloc */
 188         WARN_ON(!list_empty(&vb->queue));
 189
 190         BUG_ON(NULL == icd->current_fmt);
 191
 192         /*
 193          * I think, in buf_prepare you only have to protect global data,
 194          * the actual buffer is yours
 195          */
 196         buf->inwork = 1;
 197
 198         if (buf->code   != icd->current_fmt->code ||
 199             vb->width   != icd->user_width ||
 200             vb->height  != icd->user_height ||
 201             vb->field   != field) {
 202                 buf->code       = icd->current_fmt->code;
 203                 vb->width       = icd->user_width;
 204                 vb->height      = icd->user_height;
 205                 vb->field       = field;
 206                 vb->state       = VIDEOBUF_NEEDS_INIT;
 207         }
 208
 209         vb->size = bytes_per_line * vb->height;
 210         if (0 != vb->baddr && vb->bsize < vb->size) {
 211                 ret = -EINVAL;
 212                 goto out;
 213         }
 214
 215         if (vb->state == VIDEOBUF_NEEDS_INIT) {
 216                 ret = videobuf_iolock(vq, vb, NULL);
 217                 if (ret)
 218                         goto fail;
 219
 220                 vb->state = VIDEOBUF_PREPARED;
 221         }
 222
 223         buf->inwork = 0;
 224
 225         return 0;
 226
 227 fail:
 228         free_buffer(vq, buf);
 229 out:
 230         buf->inwork = 0;
 231         return ret;
 232 }
 233
 234 static int mx1_camera_setup_dma(struct mx1_camera_dev *pcdev)
 235 {
 236         struct videobuf_buffer *vbuf = &pcdev->active->vb;
 237         struct device *dev = pcdev->icd->dev.parent;
 238         int ret;
 239
 240         if (unlikely(!pcdev->active)) {
 241                 dev_err(dev, "DMA End IRQ with no active buffer\n");
 242                 return -EFAULT;
 243         }
 244
 245         /* setup sg list for future DMA */
 246         ret = imx_dma_setup_single(pcdev->dma_chan,
 247                 videobuf_to_dma_contig(vbuf),
 248                 vbuf->size, pcdev->res->start +
 249                 CSIRXR, DMA_MODE_READ);
 250         if (unlikely(ret))
 251                 dev_err(dev, "Failed to setup DMA sg list\n");
 252
 253         return ret;
 254 }
 255
 256 /* Called under spinlock_irqsave(&pcdev->lock, ...) */
 257 static void mx1_videobuf_queue(struct videobuf_queue *vq,
 258                                                 struct videobuf_buffer *vb)
 259 {
 260         struct soc_camera_device *icd = vq->priv_data;
 261         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 262         struct mx1_camera_dev *pcdev = ici->priv;
 263         struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
 264
 265         dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
 266                 vb, vb->baddr, vb->bsize);
 267
 268         list_add_tail(&vb->queue, &pcdev->capture);
 269
 270         vb->state = VIDEOBUF_ACTIVE;
 271
 272         if (!pcdev->active) {
 273                 pcdev->active = buf;
 274
 275                 /* setup sg list for future DMA */
 276                 if (!mx1_camera_setup_dma(pcdev)) {
 277                         unsigned int temp;
 278                         /* enable SOF irq */
 279                         temp = __raw_readl(pcdev->base + CSICR1) |
 280                                                         CSICR1_SOF_INTEN;
 281                         __raw_writel(temp, pcdev->base + CSICR1);
 282                 }
 283         }
 284 }
 285
 286 static void mx1_videobuf_release(struct videobuf_queue *vq,
 287                                  struct videobuf_buffer *vb)
 288 {
 289         struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
 290 #ifdef DEBUG
 291         struct soc_camera_device *icd = vq->priv_data;
 292         struct device *dev = icd->dev.parent;
 293
 294         dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
 295                 vb, vb->baddr, vb->bsize);
 296
 297         switch (vb->state) {
 298         case VIDEOBUF_ACTIVE:
 299                 dev_dbg(dev, "%s (active)\n", __func__);
 300                 break;
 301         case VIDEOBUF_QUEUED:
 302                 dev_dbg(dev, "%s (queued)\n", __func__);
 303                 break;
 304         case VIDEOBUF_PREPARED:
 305                 dev_dbg(dev, "%s (prepared)\n", __func__);
 306                 break;
 307         default:
 308                 dev_dbg(dev, "%s (unknown)\n", __func__);
 309                 break;
 310         }
 311 #endif
 312
 313         free_buffer(vq, buf);
 314 }
 315
 316 static void mx1_camera_wakeup(struct mx1_camera_dev *pcdev,
 317                               struct videobuf_buffer *vb,
 318                               struct mx1_buffer *buf)
 319 {
 320         /* _init is used to debug races, see comment in mx1_camera_reqbufs() */
 321         list_del_init(&vb->queue);
 322         vb->state = VIDEOBUF_DONE;
 323         do_gettimeofday(&vb->ts);
 324         vb->field_count++;
 325         wake_up(&vb->done);
 326
 327         if (list_empty(&pcdev->capture)) {
 328                 pcdev->active = NULL;
 329                 return;
 330         }
 331
 332         pcdev->active = list_entry(pcdev->capture.next,
 333                                    struct mx1_buffer, vb.queue);
 334
 335         /* setup sg list for future DMA */
 336         if (likely(!mx1_camera_setup_dma(pcdev))) {
 337                 unsigned int temp;
 338
 339                 /* enable SOF irq */
 340                 temp = __raw_readl(pcdev->base + CSICR1) | CSICR1_SOF_INTEN;
 341                 __raw_writel(temp, pcdev->base + CSICR1);
 342         }
 343 }
 344
 345 static void mx1_camera_dma_irq(int channel, void *data)
 346 {
 347         struct mx1_camera_dev *pcdev = data;
 348         struct device *dev = pcdev->icd->dev.parent;
 349         struct mx1_buffer *buf;
 350         struct videobuf_buffer *vb;
 351         unsigned long flags;
 352
 353         spin_lock_irqsave(&pcdev->lock, flags);
 354
 355         imx_dma_disable(channel);
 356
 357         if (unlikely(!pcdev->active)) {
 358                 dev_err(dev, "DMA End IRQ with no active buffer\n");
 359                 goto out;
 360         }
 361
 362         vb = &pcdev->active->vb;
 363         buf = container_of(vb, struct mx1_buffer, vb);
 364         WARN_ON(buf->inwork || list_empty(&vb->queue));
 365         dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
 366                 vb, vb->baddr, vb->bsize);
 367
 368         mx1_camera_wakeup(pcdev, vb, buf);
 369 out:
 370         spin_unlock_irqrestore(&pcdev->lock, flags);
 371 }
 372
 373 static struct videobuf_queue_ops mx1_videobuf_ops = {
 374         .buf_setup      = mx1_videobuf_setup,
 375         .buf_prepare    = mx1_videobuf_prepare,
 376         .buf_queue      = mx1_videobuf_queue,
 377         .buf_release    = mx1_videobuf_release,
 378 };
 379
 380 static void mx1_camera_init_videobuf(struct videobuf_queue *q,
 381                                      struct soc_camera_device *icd)
 382 {
 383         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 384         struct mx1_camera_dev *pcdev = ici->priv;
 385
 386         videobuf_queue_dma_contig_init(q, &mx1_videobuf_ops, icd->dev.parent,
 387                                         &pcdev->lock,
 388                                         V4L2_BUF_TYPE_VIDEO_CAPTURE,
 389                                         V4L2_FIELD_NONE,
 390                                         sizeof(struct mx1_buffer), icd);
 391 }
 392
 393 static int mclk_get_divisor(struct mx1_camera_dev *pcdev)
 394 {
 395         unsigned int mclk = pcdev->mclk;
 396         unsigned long div;
 397         unsigned long lcdclk;
 398
 399         lcdclk = clk_get_rate(pcdev->clk);
 400
 401         /*
 402          * We verify platform_mclk_10khz != 0, so if anyone breaks it, here
 403          * they get a nice Oops
 404          */
 405         div = (lcdclk + 2 * mclk - 1) / (2 * mclk) - 1;
 406
 407         dev_dbg(pcdev->icd->dev.parent,
 408                 "System clock %lukHz, target freq %dkHz, divisor %lu\n",
 409                 lcdclk / 1000, mclk / 1000, div);
 410
 411         return div;
 412 }
 413
 414 static void mx1_camera_activate(struct mx1_camera_dev *pcdev)
 415 {
 416         unsigned int csicr1 = CSICR1_EN;
 417
 418         dev_dbg(pcdev->icd->dev.parent, "Activate device\n");
 419
 420         clk_enable(pcdev->clk);
 421
 422         /* enable CSI before doing anything else */
 423         __raw_writel(csicr1, pcdev->base + CSICR1);
 424
 425         csicr1 |= CSICR1_MCLKEN | CSICR1_FCC | CSICR1_GCLK_MODE;
 426         csicr1 |= CSICR1_MCLKDIV(mclk_get_divisor(pcdev));
 427         csicr1 |= CSICR1_RXFF_LEVEL(2); /* 16 words */
 428
 429         __raw_writel(csicr1, pcdev->base + CSICR1);
 430 }
 431
 432 static void mx1_camera_deactivate(struct mx1_camera_dev *pcdev)
 433 {
 434         dev_dbg(pcdev->icd->dev.parent, "Deactivate device\n");
 435
 436         /* Disable all CSI interface */
 437         __raw_writel(0x00, pcdev->base + CSICR1);
 438
 439         clk_disable(pcdev->clk);
 440 }
 441
 442 /*
 443  * The following two functions absolutely depend on the fact, that
 444  * there can be only one camera on i.MX1/i.MXL camera sensor interface
 445  */
 446 static int mx1_camera_add_device(struct soc_camera_device *icd)
 447 {
 448         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 449         struct mx1_camera_dev *pcdev = ici->priv;
 450         int ret;
 451
 452         if (pcdev->icd) {
 453                 ret = -EBUSY;
 454                 goto ebusy;
 455         }
 456
 457         dev_info(icd->dev.parent, "MX1 Camera driver attached to camera %d\n",
 458                  icd->devnum);
 459
 460         mx1_camera_activate(pcdev);
 461
 462         pcdev->icd = icd;
 463
 464 ebusy:
 465         return ret;
 466 }
 467
 468 static void mx1_camera_remove_device(struct soc_camera_device *icd)
 469 {
 470         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 471         struct mx1_camera_dev *pcdev = ici->priv;
 472         unsigned int csicr1;
 473
 474         BUG_ON(icd != pcdev->icd);
 475
 476         /* disable interrupts */
 477         csicr1 = __raw_readl(pcdev->base + CSICR1) & ~CSI_IRQ_MASK;
 478         __raw_writel(csicr1, pcdev->base + CSICR1);
 479
 480         /* Stop DMA engine */
 481         imx_dma_disable(pcdev->dma_chan);
 482
 483         dev_info(icd->dev.parent, "MX1 Camera driver detached from camera %d\n",
 484                  icd->devnum);
 485
 486         mx1_camera_deactivate(pcdev);
 487
 488         pcdev->icd = NULL;
 489 }
 490
 491 static int mx1_camera_set_crop(struct soc_camera_device *icd,
 492                                struct v4l2_crop *a)
 493 {
 494         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 495
 496         return v4l2_subdev_call(sd, video, s_crop, a);
 497 }
 498
 499 static int mx1_camera_set_bus_param(struct soc_camera_device *icd, __u32 pixfmt)
 500 {
 501         struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 502         struct mx1_camera_dev *pcdev = ici->priv;
 503         unsigned long camera_flags, common_flags;
 504         unsigned int csicr1;
 505         int ret;
 506
 507         camera_flags = icd->ops->query_bus_param(icd);
 508
 509         /* MX1 supports only 8bit buswidth */
 510         common_flags = soc_camera_bus_param_compatible(camera_flags,
 511                                                        CSI_BUS_FLAGS);
 512         if (!common_flags)
 513                 return -EINVAL;
 514
 515         /* Make choises, based on platform choice */
 516         if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) &&
 517                 (common_flags & SOCAM_VSYNC_ACTIVE_LOW)) {
 518                         if (!pcdev->pdata ||
 519                              pcdev->pdata->flags & MX1_CAMERA_VSYNC_HIGH)
 520                                 common_flags &= ~SOCAM_VSYNC_ACTIVE_LOW;
 521                         else
 522                                 common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH;
 523         }
 524
 525         if ((common_flags & SOCAM_PCLK_SAMPLE_RISING) &&
 526                 (common_flags & SOCAM_PCLK_SAMPLE_FALLING)) {
 527                         if (!pcdev->pdata ||
 528                              pcdev->pdata->flags & MX1_CAMERA_PCLK_RISING)
 529                                 common_flags &= ~SOCAM_PCLK_SAMPLE_FALLING;
 530                         else
 531                                 common_flags &= ~SOCAM_PCLK_SAMPLE_RISING;
 532         }
 533
 534         if ((common_flags & SOCAM_DATA_ACTIVE_HIGH) &&
 535                 (common_flags & SOCAM_DATA_ACTIVE_LOW)) {
 536                         if (!pcdev->pdata ||
 537                              pcdev->pdata->flags & MX1_CAMERA_DATA_HIGH)
 538                                 common_flags &= ~SOCAM_DATA_ACTIVE_LOW;
 539                         else
 540                                 common_flags &= ~SOCAM_DATA_ACTIVE_HIGH;
 541         }
 542
 543         ret = icd->ops->set_bus_param(icd, common_flags);
 544         if (ret < 0)
 545                 return ret;
 546
 547         csicr1 = __raw_readl(pcdev->base + CSICR1);
 548
 549         if (common_flags & SOCAM_PCLK_SAMPLE_RISING)
 550                 csicr1 |= CSICR1_REDGE;
 551         if (common_flags & SOCAM_VSYNC_ACTIVE_HIGH)
 552                 csicr1 |= CSICR1_SOF_POL;
 553         if (common_flags & SOCAM_DATA_ACTIVE_LOW)
 554                 csicr1 |= CSICR1_DATA_POL;
 555
 556         __raw_writel(csicr1, pcdev->base + CSICR1);
 557
 558         return 0;
 559 }
 560
 561 static int mx1_camera_set_fmt(struct soc_camera_device *icd,
 562                               struct v4l2_format *f)
 563 {
 564         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 565         const struct soc_camera_format_xlate *xlate;
 566         struct v4l2_pix_format *pix = &f->fmt.pix;
 567         struct v4l2_mbus_framefmt mf;
 568         int ret, buswidth;
 569
 570         xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
 571         if (!xlate) {
 572                 dev_warn(icd->dev.parent, "Format %x not found\n",
 573                          pix->pixelformat);
 574                 return -EINVAL;
 575         }
 576
 577         buswidth = xlate->host_fmt->bits_per_sample;
 578         if (buswidth > 8) {
 579                 dev_warn(icd->dev.parent,
 580                          "bits-per-sample %d for format %x unsupported\n",
 581                          buswidth, pix->pixelformat);
 582                 return -EINVAL;
 583         }
 584
 585         mf.width        = pix->width;
 586         mf.height       = pix->height;
 587         mf.field        = pix->field;
 588         mf.colorspace   = pix->colorspace;
 589         mf.code         = xlate->code;
 590
 591         ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
 592         if (ret < 0)
 593                 return ret;
 594
 595         if (mf.code != xlate->code)
 596                 return -EINVAL;
 597
 598         pix->width              = mf.width;
 599         pix->height             = mf.height;
 600         pix->field              = mf.field;
 601         pix->colorspace         = mf.colorspace;
 602         icd->current_fmt        = xlate;
 603
 604         return ret;
 605 }
 606
 607 static int mx1_camera_try_fmt(struct soc_camera_device *icd,
 608                               struct v4l2_format *f)
 609 {
 610         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 611         const struct soc_camera_format_xlate *xlate;
 612         struct v4l2_pix_format *pix = &f->fmt.pix;
 613         struct v4l2_mbus_framefmt mf;
 614         int ret;
 615         /* TODO: limit to mx1 hardware capabilities */
 616
 617         xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
 618         if (!xlate) {
 619                 dev_warn(icd->dev.parent, "Format %x not found\n",
 620                          pix->pixelformat);
 621                 return -EINVAL;
 622         }
 623
 624         mf.width        = pix->width;
 625         mf.height       = pix->height;
 626         mf.field        = pix->field;
 627         mf.colorspace   = pix->colorspace;
 628         mf.code         = xlate->code;
 629
 630         /* limit to sensor capabilities */
 631         ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
 632         if (ret < 0)
 633                 return ret;
 634
 635         pix->width      = mf.width;
 636         pix->height     = mf.height;
 637         pix->field      = mf.field;
 638         pix->colorspace = mf.colorspace;
 639
 640         return 0;
 641 }
 642
 643 static int mx1_camera_reqbufs(struct soc_camera_file *icf,
 644                               struct v4l2_requestbuffers *p)
 645 {
 646         int i;
 647
 648         /*
 649          * This is for locking debugging only. I removed spinlocks and now I
 650          * check whether .prepare is ever called on a linked buffer, or whether
 651          * a dma IRQ can occur for an in-work or unlinked buffer. Until now
 652          * it hadn't triggered
 653          */
 654         for (i = 0; i < p->count; i++) {
 655                 struct mx1_buffer *buf = container_of(icf->vb_vidq.bufs[i],
 656                                                       struct mx1_buffer, vb);
 657                 buf->inwork = 0;
 658                 INIT_LIST_HEAD(&buf->vb.queue);
 659         }
 660
 661         return 0;
 662 }
 663
 664 static unsigned int mx1_camera_poll(struct file *file, poll_table *pt)
 665 {
 666         struct soc_camera_file *icf = file->private_data;
 667         struct mx1_buffer *buf;
 668
 669         buf = list_entry(icf->vb_vidq.stream.next, struct mx1_buffer,
 670                          vb.stream);
 671
 672         poll_wait(file, &buf->vb.done, pt);
 673
 674         if (buf->vb.state == VIDEOBUF_DONE ||
 675             buf->vb.state == VIDEOBUF_ERROR)
 676                 return POLLIN | POLLRDNORM;
 677
 678         return 0;
 679 }
 680
 681 static int mx1_camera_querycap(struct soc_camera_host *ici,
 682                                struct v4l2_capability *cap)
 683 {
 684         /* cap->name is set by the friendly caller:-> */
 685         strlcpy(cap->card, "i.MX1/i.MXL Camera", sizeof(cap->card));
 686         cap->version = VERSION_CODE;
 687         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
 688
 689         return 0;
 690 }
 691
 692 static struct soc_camera_host_ops mx1_soc_camera_host_ops = {
 693         .owner          = THIS_MODULE,
 694         .add            = mx1_camera_add_device,
 695         .remove         = mx1_camera_remove_device,
 696         .set_bus_param  = mx1_camera_set_bus_param,
 697         .set_crop       = mx1_camera_set_crop,
 698         .set_fmt        = mx1_camera_set_fmt,
 699         .try_fmt        = mx1_camera_try_fmt,
 700         .init_videobuf  = mx1_camera_init_videobuf,
 701         .reqbufs        = mx1_camera_reqbufs,
 702         .poll           = mx1_camera_poll,
 703         .querycap       = mx1_camera_querycap,
 704 };
 705
 706 static struct fiq_handler fh = {
 707         .name           = "csi_sof"
 708 };
 709
 710 static int __init mx1_camera_probe(struct platform_device *pdev)
 711 {
 712         struct mx1_camera_dev *pcdev;
 713         struct resource *res;
 714         struct pt_regs regs;
 715         struct clk *clk;
 716         void __iomem *base;
 717         unsigned int irq;
 718         int err = 0;
 719
 720         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 721         irq = platform_get_irq(pdev, 0);
 722         if (!res || (int)irq <= 0) {
 723                 err = -ENODEV;
 724                 goto exit;
 725         }
 726
 727         clk = clk_get(&pdev->dev, "csi_clk");
 728         if (IS_ERR(clk)) {
 729                 err = PTR_ERR(clk);
 730                 goto exit;
 731         }
 732
 733         pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
 734         if (!pcdev) {
 735                 dev_err(&pdev->dev, "Could not allocate pcdev\n");
 736                 err = -ENOMEM;
 737                 goto exit_put_clk;
 738         }
 739
 740         pcdev->res = res;
 741         pcdev->clk = clk;
 742
 743         pcdev->pdata = pdev->dev.platform_data;
 744
 745         if (pcdev->pdata)
 746                 pcdev->mclk = pcdev->pdata->mclk_10khz * 10000;
 747
 748         if (!pcdev->mclk) {
 749                 dev_warn(&pdev->dev,
 750                          "mclk_10khz == 0! Please, fix your platform data. "
 751                          "Using default 20MHz\n");
 752                 pcdev->mclk = 20000000;
 753         }
 754
 755         INIT_LIST_HEAD(&pcdev->capture);
 756         spin_lock_init(&pcdev->lock);
 757
 758         /*
 759          * Request the regions.
 760          */
 761         if (!request_mem_region(res->start, resource_size(res), DRIVER_NAME)) {
 762                 err = -EBUSY;
 763                 goto exit_kfree;
 764         }
 765
 766         base = ioremap(res->start, resource_size(res));
 767         if (!base) {
 768                 err = -ENOMEM;
 769                 goto exit_release;
 770         }
 771         pcdev->irq = irq;
 772         pcdev->base = base;
 773
 774         /* request dma */
 775         pcdev->dma_chan = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_HIGH);
 776         if (pcdev->dma_chan < 0) {
 777                 dev_err(&pdev->dev, "Can't request DMA for MX1 CSI\n");
 778                 err = -EBUSY;
 779                 goto exit_iounmap;
 780         }
 781         dev_dbg(&pdev->dev, "got DMA channel %d\n", pcdev->dma_chan);
 782
 783         imx_dma_setup_handlers(pcdev->dma_chan, mx1_camera_dma_irq, NULL,
 784                                pcdev);
 785
 786         imx_dma_config_channel(pcdev->dma_chan, IMX_DMA_TYPE_FIFO,
 787                                IMX_DMA_MEMSIZE_32, DMA_REQ_CSI_R, 0);
 788         /* burst length : 16 words = 64 bytes */
 789         imx_dma_config_burstlen(pcdev->dma_chan, 0);
 790
 791         /* request irq */
 792         err = claim_fiq(&fh);
 793         if (err) {
 794                 dev_err(&pdev->dev, "Camera interrupt register failed \n");
 795                 goto exit_free_dma;
 796         }
 797
 798         set_fiq_handler(&mx1_camera_sof_fiq_start, &mx1_camera_sof_fiq_end -
 799                                                    &mx1_camera_sof_fiq_start);
 800
 801         regs.ARM_r8 = DMA_BASE + DMA_DIMR;
 802         regs.ARM_r9 = DMA_BASE + DMA_CCR(pcdev->dma_chan);
 803         regs.ARM_r10 = (long)pcdev->base + CSICR1;
 804         regs.ARM_fp = (long)pcdev->base + CSISR;
 805         regs.ARM_sp = 1 << pcdev->dma_chan;
 806         set_fiq_regs(&regs);
 807
 808         mxc_set_irq_fiq(irq, 1);
 809         enable_fiq(irq);
 810
 811         pcdev->soc_host.drv_name        = DRIVER_NAME;
 812         pcdev->soc_host.ops             = &mx1_soc_camera_host_ops;
 813         pcdev->soc_host.priv            = pcdev;
 814         pcdev->soc_host.v4l2_dev.dev    = &pdev->dev;
 815         pcdev->soc_host.nr              = pdev->id;
 816         err = soc_camera_host_register(&pcdev->soc_host);
 817         if (err)
 818                 goto exit_free_irq;
 819
 820         dev_info(&pdev->dev, "MX1 Camera driver loaded\n");
 821
 822         return 0;
 823
 824 exit_free_irq:
 825         disable_fiq(irq);
 826         mxc_set_irq_fiq(irq, 0);
 827         release_fiq(&fh);
 828 exit_free_dma:
 829         imx_dma_free(pcdev->dma_chan);
 830 exit_iounmap:
 831         iounmap(base);
 832 exit_release:
 833         release_mem_region(res->start, resource_size(res));
 834 exit_kfree:
 835         kfree(pcdev);
 836 exit_put_clk:
 837         clk_put(clk);
 838 exit:
 839         return err;
 840 }
 841
 842 static int __exit mx1_camera_remove(struct platform_device *pdev)
 843 {
 844         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
 845         struct mx1_camera_dev *pcdev = container_of(soc_host,
 846                                         struct mx1_camera_dev, soc_host);
 847         struct resource *res;
 848
 849         imx_dma_free(pcdev->dma_chan);
 850         disable_fiq(pcdev->irq);
 851         mxc_set_irq_fiq(pcdev->irq, 0);
 852         release_fiq(&fh);
 853
 854         clk_put(pcdev->clk);
 855
 856         soc_camera_host_unregister(soc_host);
 857
 858         iounmap(pcdev->base);
 859
 860         res = pcdev->res;
 861         release_mem_region(res->start, resource_size(res));
 862
 863         kfree(pcdev);
 864
 865         dev_info(&pdev->dev, "MX1 Camera driver unloaded\n");
 866
 867         return 0;
 868 }
 869
 870 static struct platform_driver mx1_camera_driver = {
 871         .driver         = {
 872                 .name   = DRIVER_NAME,
 873         },
 874         .remove         = __exit_p(mx1_camera_remove),
 875 };
 876
 877 static int __init mx1_camera_init(void)
 878 {
 879         return platform_driver_probe(&mx1_camera_driver, mx1_camera_probe);
 880 }
 881
 882 static void __exit mx1_camera_exit(void)
 883 {
 884         return platform_driver_unregister(&mx1_camera_driver);
 885 }
 886
 887 module_init(mx1_camera_init);
 888 module_exit(mx1_camera_exit);
 889
 890 MODULE_DESCRIPTION("i.MX1/i.MXL SoC Camera Host driver");
 891 MODULE_AUTHOR("Paulius Zaleckas <paulius.zaleckas@teltonika.lt>");
 892 MODULE_LICENSE("GPL v2");
 893 MODULE_ALIAS("platform:" DRIVER_NAME);