linux/drivers/media/video/mx1_camera.c
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   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 CSICR1          0x00                    /* CSI Control Register 1 */
  53#define CSISR           0x08                    /* CSI Status Register */
  54#define CSIRXR          0x10                    /* CSI RxFIFO Register */
  55
  56#define CSICR1_RXFF_LEVEL(x)    (((x) & 0x3) << 19)
  57#define CSICR1_SOF_POL          (1 << 17)
  58#define CSICR1_SOF_INTEN        (1 << 16)
  59#define CSICR1_MCLKDIV(x)       (((x) & 0xf) << 12)
  60#define CSICR1_MCLKEN           (1 << 9)
  61#define CSICR1_FCC              (1 << 8)
  62#define CSICR1_BIG_ENDIAN       (1 << 7)
  63#define CSICR1_CLR_RXFIFO       (1 << 5)
  64#define CSICR1_GCLK_MODE        (1 << 4)
  65#define CSICR1_DATA_POL         (1 << 2)
  66#define CSICR1_REDGE            (1 << 1)
  67#define CSICR1_EN               (1 << 0)
  68
  69#define CSISR_SFF_OR_INT        (1 << 25)
  70#define CSISR_RFF_OR_INT        (1 << 24)
  71#define CSISR_STATFF_INT        (1 << 21)
  72#define CSISR_RXFF_INT          (1 << 18)
  73#define CSISR_SOF_INT           (1 << 16)
  74#define CSISR_DRDY              (1 << 0)
  75
  76#define VERSION_CODE KERNEL_VERSION(0, 0, 1)
  77#define DRIVER_NAME "mx1-camera"
  78
  79#define CSI_IRQ_MASK    (CSISR_SFF_OR_INT | CSISR_RFF_OR_INT | \
  80                        CSISR_STATFF_INT | CSISR_RXFF_INT | CSISR_SOF_INT)
  81
  82#define CSI_BUS_FLAGS   (SOCAM_MASTER | SOCAM_HSYNC_ACTIVE_HIGH | \
  83                        SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW | \
  84                        SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING | \
  85                        SOCAM_DATA_ACTIVE_HIGH | SOCAM_DATA_ACTIVE_LOW | \
  86                        SOCAM_DATAWIDTH_8)
  87
  88#define MAX_VIDEO_MEM 16        /* Video memory limit in megabytes */
  89
  90/*
  91 * Structures
  92 */
  93
  94/* buffer for one video frame */
  95struct mx1_buffer {
  96        /* common v4l buffer stuff -- must be first */
  97        struct videobuf_buffer          vb;
  98        enum v4l2_mbus_pixelcode        code;
  99        int                             inwork;
 100};
 101
 102/*
 103 * i.MX1/i.MXL is only supposed to handle one camera on its Camera Sensor
 104 * Interface. If anyone ever builds hardware to enable more than
 105 * one camera, they will have to modify this driver too
 106 */
 107struct mx1_camera_dev {
 108        struct soc_camera_host          soc_host;
 109        struct soc_camera_device        *icd;
 110        struct mx1_camera_pdata         *pdata;
 111        struct mx1_buffer               *active;
 112        struct resource                 *res;
 113        struct clk                      *clk;
 114        struct list_head                capture;
 115
 116        void __iomem                    *base;
 117        int                             dma_chan;
 118        unsigned int                    irq;
 119        unsigned long                   mclk;
 120
 121        spinlock_t                      lock;
 122};
 123
 124/*
 125 *  Videobuf operations
 126 */
 127static int mx1_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
 128                              unsigned int *size)
 129{
 130        struct soc_camera_device *icd = vq->priv_data;
 131        int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 132                                                icd->current_fmt->host_fmt);
 133
 134        if (bytes_per_line < 0)
 135                return bytes_per_line;
 136
 137        *size = bytes_per_line * icd->user_height;
 138
 139        if (!*count)
 140                *count = 32;
 141
 142        if (*size * *count > MAX_VIDEO_MEM * 1024 * 1024)
 143                *count = (MAX_VIDEO_MEM * 1024 * 1024) / *size;
 144
 145        dev_dbg(icd->dev.parent, "count=%d, size=%d\n", *count, *size);
 146
 147        return 0;
 148}
 149
 150static void free_buffer(struct videobuf_queue *vq, struct mx1_buffer *buf)
 151{
 152        struct soc_camera_device *icd = vq->priv_data;
 153        struct videobuf_buffer *vb = &buf->vb;
 154
 155        BUG_ON(in_interrupt());
 156
 157        dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
 158                vb, vb->baddr, vb->bsize);
 159
 160        /*
 161         * This waits until this buffer is out of danger, i.e., until it is no
 162         * longer in STATE_QUEUED or STATE_ACTIVE
 163         */
 164        videobuf_waiton(vb, 0, 0);
 165        videobuf_dma_contig_free(vq, vb);
 166
 167        vb->state = VIDEOBUF_NEEDS_INIT;
 168}
 169
 170static int mx1_videobuf_prepare(struct videobuf_queue *vq,
 171                struct videobuf_buffer *vb, enum v4l2_field field)
 172{
 173        struct soc_camera_device *icd = vq->priv_data;
 174        struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
 175        int ret;
 176        int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 177                                                icd->current_fmt->host_fmt);
 178
 179        if (bytes_per_line < 0)
 180                return bytes_per_line;
 181
 182        dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
 183                vb, vb->baddr, vb->bsize);
 184
 185        /* Added list head initialization on alloc */
 186        WARN_ON(!list_empty(&vb->queue));
 187
 188        BUG_ON(NULL == icd->current_fmt);
 189
 190        /*
 191         * I think, in buf_prepare you only have to protect global data,
 192         * the actual buffer is yours
 193         */
 194        buf->inwork = 1;
 195
 196        if (buf->code   != icd->current_fmt->code ||
 197            vb->width   != icd->user_width ||
 198            vb->height  != icd->user_height ||
 199            vb->field   != field) {
 200                buf->code       = icd->current_fmt->code;
 201                vb->width       = icd->user_width;
 202                vb->height      = icd->user_height;
 203                vb->field       = field;
 204                vb->state       = VIDEOBUF_NEEDS_INIT;
 205        }
 206
 207        vb->size = bytes_per_line * vb->height;
 208        if (0 != vb->baddr && vb->bsize < vb->size) {
 209                ret = -EINVAL;
 210                goto out;
 211        }
 212
 213        if (vb->state == VIDEOBUF_NEEDS_INIT) {
 214                ret = videobuf_iolock(vq, vb, NULL);
 215                if (ret)
 216                        goto fail;
 217
 218                vb->state = VIDEOBUF_PREPARED;
 219        }
 220
 221        buf->inwork = 0;
 222
 223        return 0;
 224
 225fail:
 226        free_buffer(vq, buf);
 227out:
 228        buf->inwork = 0;
 229        return ret;
 230}
 231
 232static int mx1_camera_setup_dma(struct mx1_camera_dev *pcdev)
 233{
 234        struct videobuf_buffer *vbuf = &pcdev->active->vb;
 235        struct device *dev = pcdev->icd->dev.parent;
 236        int ret;
 237
 238        if (unlikely(!pcdev->active)) {
 239                dev_err(dev, "DMA End IRQ with no active buffer\n");
 240                return -EFAULT;
 241        }
 242
 243        /* setup sg list for future DMA */
 244        ret = imx_dma_setup_single(pcdev->dma_chan,
 245                videobuf_to_dma_contig(vbuf),
 246                vbuf->size, pcdev->res->start +
 247                CSIRXR, DMA_MODE_READ);
 248        if (unlikely(ret))
 249                dev_err(dev, "Failed to setup DMA sg list\n");
 250
 251        return ret;
 252}
 253
 254/* Called under spinlock_irqsave(&pcdev->lock, ...) */
 255static void mx1_videobuf_queue(struct videobuf_queue *vq,
 256                                                struct videobuf_buffer *vb)
 257{
 258        struct soc_camera_device *icd = vq->priv_data;
 259        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 260        struct mx1_camera_dev *pcdev = ici->priv;
 261        struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
 262
 263        dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
 264                vb, vb->baddr, vb->bsize);
 265
 266        list_add_tail(&vb->queue, &pcdev->capture);
 267
 268        vb->state = VIDEOBUF_ACTIVE;
 269
 270        if (!pcdev->active) {
 271                pcdev->active = buf;
 272
 273                /* setup sg list for future DMA */
 274                if (!mx1_camera_setup_dma(pcdev)) {
 275                        unsigned int temp;
 276                        /* enable SOF irq */
 277                        temp = __raw_readl(pcdev->base + CSICR1) |
 278                                                        CSICR1_SOF_INTEN;
 279                        __raw_writel(temp, pcdev->base + CSICR1);
 280                }
 281        }
 282}
 283
 284static void mx1_videobuf_release(struct videobuf_queue *vq,
 285                                 struct videobuf_buffer *vb)
 286{
 287        struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
 288#ifdef DEBUG
 289        struct soc_camera_device *icd = vq->priv_data;
 290        struct device *dev = icd->dev.parent;
 291
 292        dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
 293                vb, vb->baddr, vb->bsize);
 294
 295        switch (vb->state) {
 296        case VIDEOBUF_ACTIVE:
 297                dev_dbg(dev, "%s (active)\n", __func__);
 298                break;
 299        case VIDEOBUF_QUEUED:
 300                dev_dbg(dev, "%s (queued)\n", __func__);
 301                break;
 302        case VIDEOBUF_PREPARED:
 303                dev_dbg(dev, "%s (prepared)\n", __func__);
 304                break;
 305        default:
 306                dev_dbg(dev, "%s (unknown)\n", __func__);
 307                break;
 308        }
 309#endif
 310
 311        free_buffer(vq, buf);
 312}
 313
 314static void mx1_camera_wakeup(struct mx1_camera_dev *pcdev,
 315                              struct videobuf_buffer *vb,
 316                              struct mx1_buffer *buf)
 317{
 318        /* _init is used to debug races, see comment in mx1_camera_reqbufs() */
 319        list_del_init(&vb->queue);
 320        vb->state = VIDEOBUF_DONE;
 321        do_gettimeofday(&vb->ts);
 322        vb->field_count++;
 323        wake_up(&vb->done);
 324
 325        if (list_empty(&pcdev->capture)) {
 326                pcdev->active = NULL;
 327                return;
 328        }
 329
 330        pcdev->active = list_entry(pcdev->capture.next,
 331                                   struct mx1_buffer, vb.queue);
 332
 333        /* setup sg list for future DMA */
 334        if (likely(!mx1_camera_setup_dma(pcdev))) {
 335                unsigned int temp;
 336
 337                /* enable SOF irq */
 338                temp = __raw_readl(pcdev->base + CSICR1) | CSICR1_SOF_INTEN;
 339                __raw_writel(temp, pcdev->base + CSICR1);
 340        }
 341}
 342
 343static void mx1_camera_dma_irq(int channel, void *data)
 344{
 345        struct mx1_camera_dev *pcdev = data;
 346        struct device *dev = pcdev->icd->dev.parent;
 347        struct mx1_buffer *buf;
 348        struct videobuf_buffer *vb;
 349        unsigned long flags;
 350
 351        spin_lock_irqsave(&pcdev->lock, flags);
 352
 353        imx_dma_disable(channel);
 354
 355        if (unlikely(!pcdev->active)) {
 356                dev_err(dev, "DMA End IRQ with no active buffer\n");
 357                goto out;
 358        }
 359
 360        vb = &pcdev->active->vb;
 361        buf = container_of(vb, struct mx1_buffer, vb);
 362        WARN_ON(buf->inwork || list_empty(&vb->queue));
 363        dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
 364                vb, vb->baddr, vb->bsize);
 365
 366        mx1_camera_wakeup(pcdev, vb, buf);
 367out:
 368        spin_unlock_irqrestore(&pcdev->lock, flags);
 369}
 370
 371static struct videobuf_queue_ops mx1_videobuf_ops = {
 372        .buf_setup      = mx1_videobuf_setup,
 373        .buf_prepare    = mx1_videobuf_prepare,
 374        .buf_queue      = mx1_videobuf_queue,
 375        .buf_release    = mx1_videobuf_release,
 376};
 377
 378static void mx1_camera_init_videobuf(struct videobuf_queue *q,
 379                                     struct soc_camera_device *icd)
 380{
 381        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 382        struct mx1_camera_dev *pcdev = ici->priv;
 383
 384        videobuf_queue_dma_contig_init(q, &mx1_videobuf_ops, icd->dev.parent,
 385                                        &pcdev->lock,
 386                                        V4L2_BUF_TYPE_VIDEO_CAPTURE,
 387                                        V4L2_FIELD_NONE,
 388                                        sizeof(struct mx1_buffer), icd);
 389}
 390
 391static int mclk_get_divisor(struct mx1_camera_dev *pcdev)
 392{
 393        unsigned int mclk = pcdev->mclk;
 394        unsigned long div;
 395        unsigned long lcdclk;
 396
 397        lcdclk = clk_get_rate(pcdev->clk);
 398
 399        /*
 400         * We verify platform_mclk_10khz != 0, so if anyone breaks it, here
 401         * they get a nice Oops
 402         */
 403        div = (lcdclk + 2 * mclk - 1) / (2 * mclk) - 1;
 404
 405        dev_dbg(pcdev->icd->dev.parent,
 406                "System clock %lukHz, target freq %dkHz, divisor %lu\n",
 407                lcdclk / 1000, mclk / 1000, div);
 408
 409        return div;
 410}
 411
 412static void mx1_camera_activate(struct mx1_camera_dev *pcdev)
 413{
 414        unsigned int csicr1 = CSICR1_EN;
 415
 416        dev_dbg(pcdev->icd->dev.parent, "Activate device\n");
 417
 418        clk_enable(pcdev->clk);
 419
 420        /* enable CSI before doing anything else */
 421        __raw_writel(csicr1, pcdev->base + CSICR1);
 422
 423        csicr1 |= CSICR1_MCLKEN | CSICR1_FCC | CSICR1_GCLK_MODE;
 424        csicr1 |= CSICR1_MCLKDIV(mclk_get_divisor(pcdev));
 425        csicr1 |= CSICR1_RXFF_LEVEL(2); /* 16 words */
 426
 427        __raw_writel(csicr1, pcdev->base + CSICR1);
 428}
 429
 430static void mx1_camera_deactivate(struct mx1_camera_dev *pcdev)
 431{
 432        dev_dbg(pcdev->icd->dev.parent, "Deactivate device\n");
 433
 434        /* Disable all CSI interface */
 435        __raw_writel(0x00, pcdev->base + CSICR1);
 436
 437        clk_disable(pcdev->clk);
 438}
 439
 440/*
 441 * The following two functions absolutely depend on the fact, that
 442 * there can be only one camera on i.MX1/i.MXL camera sensor interface
 443 */
 444static int mx1_camera_add_device(struct soc_camera_device *icd)
 445{
 446        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 447        struct mx1_camera_dev *pcdev = ici->priv;
 448        int ret;
 449
 450        if (pcdev->icd) {
 451                ret = -EBUSY;
 452                goto ebusy;
 453        }
 454
 455        dev_info(icd->dev.parent, "MX1 Camera driver attached to camera %d\n",
 456                 icd->devnum);
 457
 458        mx1_camera_activate(pcdev);
 459
 460        pcdev->icd = icd;
 461
 462ebusy:
 463        return ret;
 464}
 465
 466static void mx1_camera_remove_device(struct soc_camera_device *icd)
 467{
 468        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 469        struct mx1_camera_dev *pcdev = ici->priv;
 470        unsigned int csicr1;
 471
 472        BUG_ON(icd != pcdev->icd);
 473
 474        /* disable interrupts */
 475        csicr1 = __raw_readl(pcdev->base + CSICR1) & ~CSI_IRQ_MASK;
 476        __raw_writel(csicr1, pcdev->base + CSICR1);
 477
 478        /* Stop DMA engine */
 479        imx_dma_disable(pcdev->dma_chan);
 480
 481        dev_info(icd->dev.parent, "MX1 Camera driver detached from camera %d\n",
 482                 icd->devnum);
 483
 484        mx1_camera_deactivate(pcdev);
 485
 486        pcdev->icd = NULL;
 487}
 488
 489static int mx1_camera_set_crop(struct soc_camera_device *icd,
 490                               struct v4l2_crop *a)
 491{
 492        struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 493
 494        return v4l2_subdev_call(sd, video, s_crop, a);
 495}
 496
 497static int mx1_camera_set_bus_param(struct soc_camera_device *icd, __u32 pixfmt)
 498{
 499        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 500        struct mx1_camera_dev *pcdev = ici->priv;
 501        unsigned long camera_flags, common_flags;
 502        unsigned int csicr1;
 503        int ret;
 504
 505        camera_flags = icd->ops->query_bus_param(icd);
 506
 507        /* MX1 supports only 8bit buswidth */
 508        common_flags = soc_camera_bus_param_compatible(camera_flags,
 509                                                       CSI_BUS_FLAGS);
 510        if (!common_flags)
 511                return -EINVAL;
 512
 513        /* Make choises, based on platform choice */
 514        if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) &&
 515                (common_flags & SOCAM_VSYNC_ACTIVE_LOW)) {
 516                        if (!pcdev->pdata ||
 517                             pcdev->pdata->flags & MX1_CAMERA_VSYNC_HIGH)
 518                                common_flags &= ~SOCAM_VSYNC_ACTIVE_LOW;
 519                        else
 520                                common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH;
 521        }
 522
 523        if ((common_flags & SOCAM_PCLK_SAMPLE_RISING) &&
 524                (common_flags & SOCAM_PCLK_SAMPLE_FALLING)) {
 525                        if (!pcdev->pdata ||
 526                             pcdev->pdata->flags & MX1_CAMERA_PCLK_RISING)
 527                                common_flags &= ~SOCAM_PCLK_SAMPLE_FALLING;
 528                        else
 529                                common_flags &= ~SOCAM_PCLK_SAMPLE_RISING;
 530        }
 531
 532        if ((common_flags & SOCAM_DATA_ACTIVE_HIGH) &&
 533                (common_flags & SOCAM_DATA_ACTIVE_LOW)) {
 534                        if (!pcdev->pdata ||
 535                             pcdev->pdata->flags & MX1_CAMERA_DATA_HIGH)
 536                                common_flags &= ~SOCAM_DATA_ACTIVE_LOW;
 537                        else
 538                                common_flags &= ~SOCAM_DATA_ACTIVE_HIGH;
 539        }
 540
 541        ret = icd->ops->set_bus_param(icd, common_flags);
 542        if (ret < 0)
 543                return ret;
 544
 545        csicr1 = __raw_readl(pcdev->base + CSICR1);
 546
 547        if (common_flags & SOCAM_PCLK_SAMPLE_RISING)
 548                csicr1 |= CSICR1_REDGE;
 549        if (common_flags & SOCAM_VSYNC_ACTIVE_HIGH)
 550                csicr1 |= CSICR1_SOF_POL;
 551        if (common_flags & SOCAM_DATA_ACTIVE_LOW)
 552                csicr1 |= CSICR1_DATA_POL;
 553
 554        __raw_writel(csicr1, pcdev->base + CSICR1);
 555
 556        return 0;
 557}
 558
 559static int mx1_camera_set_fmt(struct soc_camera_device *icd,
 560                              struct v4l2_format *f)
 561{
 562        struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 563        const struct soc_camera_format_xlate *xlate;
 564        struct v4l2_pix_format *pix = &f->fmt.pix;
 565        struct v4l2_mbus_framefmt mf;
 566        int ret, buswidth;
 567
 568        xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
 569        if (!xlate) {
 570                dev_warn(icd->dev.parent, "Format %x not found\n",
 571                         pix->pixelformat);
 572                return -EINVAL;
 573        }
 574
 575        buswidth = xlate->host_fmt->bits_per_sample;
 576        if (buswidth > 8) {
 577                dev_warn(icd->dev.parent,
 578                         "bits-per-sample %d for format %x unsupported\n",
 579                         buswidth, pix->pixelformat);
 580                return -EINVAL;
 581        }
 582
 583        mf.width        = pix->width;
 584        mf.height       = pix->height;
 585        mf.field        = pix->field;
 586        mf.colorspace   = pix->colorspace;
 587        mf.code         = xlate->code;
 588
 589        ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
 590        if (ret < 0)
 591                return ret;
 592
 593        if (mf.code != xlate->code)
 594                return -EINVAL;
 595
 596        pix->width              = mf.width;
 597        pix->height             = mf.height;
 598        pix->field              = mf.field;
 599        pix->colorspace         = mf.colorspace;
 600        icd->current_fmt        = xlate;
 601
 602        return ret;
 603}
 604
 605static int mx1_camera_try_fmt(struct soc_camera_device *icd,
 606                              struct v4l2_format *f)
 607{
 608        struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 609        const struct soc_camera_format_xlate *xlate;
 610        struct v4l2_pix_format *pix = &f->fmt.pix;
 611        struct v4l2_mbus_framefmt mf;
 612        int ret;
 613        /* TODO: limit to mx1 hardware capabilities */
 614
 615        xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
 616        if (!xlate) {
 617                dev_warn(icd->dev.parent, "Format %x not found\n",
 618                         pix->pixelformat);
 619                return -EINVAL;
 620        }
 621
 622        mf.width        = pix->width;
 623        mf.height       = pix->height;
 624        mf.field        = pix->field;
 625        mf.colorspace   = pix->colorspace;
 626        mf.code         = xlate->code;
 627
 628        /* limit to sensor capabilities */
 629        ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
 630        if (ret < 0)
 631                return ret;
 632
 633        pix->width      = mf.width;
 634        pix->height     = mf.height;
 635        pix->field      = mf.field;
 636        pix->colorspace = mf.colorspace;
 637
 638        return 0;
 639}
 640
 641static int mx1_camera_reqbufs(struct soc_camera_file *icf,
 642                              struct v4l2_requestbuffers *p)
 643{
 644        int i;
 645
 646        /*
 647         * This is for locking debugging only. I removed spinlocks and now I
 648         * check whether .prepare is ever called on a linked buffer, or whether
 649         * a dma IRQ can occur for an in-work or unlinked buffer. Until now
 650         * it hadn't triggered
 651         */
 652        for (i = 0; i < p->count; i++) {
 653                struct mx1_buffer *buf = container_of(icf->vb_vidq.bufs[i],
 654                                                      struct mx1_buffer, vb);
 655                buf->inwork = 0;
 656                INIT_LIST_HEAD(&buf->vb.queue);
 657        }
 658
 659        return 0;
 660}
 661
 662static unsigned int mx1_camera_poll(struct file *file, poll_table *pt)
 663{
 664        struct soc_camera_file *icf = file->private_data;
 665        struct mx1_buffer *buf;
 666
 667        buf = list_entry(icf->vb_vidq.stream.next, struct mx1_buffer,
 668                         vb.stream);
 669
 670        poll_wait(file, &buf->vb.done, pt);
 671
 672        if (buf->vb.state == VIDEOBUF_DONE ||
 673            buf->vb.state == VIDEOBUF_ERROR)
 674                return POLLIN | POLLRDNORM;
 675
 676        return 0;
 677}
 678
 679static int mx1_camera_querycap(struct soc_camera_host *ici,
 680                               struct v4l2_capability *cap)
 681{
 682        /* cap->name is set by the friendly caller:-> */
 683        strlcpy(cap->card, "i.MX1/i.MXL Camera", sizeof(cap->card));
 684        cap->version = VERSION_CODE;
 685        cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
 686
 687        return 0;
 688}
 689
 690static struct soc_camera_host_ops mx1_soc_camera_host_ops = {
 691        .owner          = THIS_MODULE,
 692        .add            = mx1_camera_add_device,
 693        .remove         = mx1_camera_remove_device,
 694        .set_bus_param  = mx1_camera_set_bus_param,
 695        .set_crop       = mx1_camera_set_crop,
 696        .set_fmt        = mx1_camera_set_fmt,
 697        .try_fmt        = mx1_camera_try_fmt,
 698        .init_videobuf  = mx1_camera_init_videobuf,
 699        .reqbufs        = mx1_camera_reqbufs,
 700        .poll           = mx1_camera_poll,
 701        .querycap       = mx1_camera_querycap,
 702};
 703
 704static struct fiq_handler fh = {
 705        .name           = "csi_sof"
 706};
 707
 708static int __init mx1_camera_probe(struct platform_device *pdev)
 709{
 710        struct mx1_camera_dev *pcdev;
 711        struct resource *res;
 712        struct pt_regs regs;
 713        struct clk *clk;
 714        void __iomem *base;
 715        unsigned int irq;
 716        int err = 0;
 717
 718        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 719        irq = platform_get_irq(pdev, 0);
 720        if (!res || (int)irq <= 0) {
 721                err = -ENODEV;
 722                goto exit;
 723        }
 724
 725        clk = clk_get(&pdev->dev, "csi_clk");
 726        if (IS_ERR(clk)) {
 727                err = PTR_ERR(clk);
 728                goto exit;
 729        }
 730
 731        pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
 732        if (!pcdev) {
 733                dev_err(&pdev->dev, "Could not allocate pcdev\n");
 734                err = -ENOMEM;
 735                goto exit_put_clk;
 736        }
 737
 738        pcdev->res = res;
 739        pcdev->clk = clk;
 740
 741        pcdev->pdata = pdev->dev.platform_data;
 742
 743        if (pcdev->pdata)
 744                pcdev->mclk = pcdev->pdata->mclk_10khz * 10000;
 745
 746        if (!pcdev->mclk) {
 747                dev_warn(&pdev->dev,
 748                         "mclk_10khz == 0! Please, fix your platform data. "
 749                         "Using default 20MHz\n");
 750                pcdev->mclk = 20000000;
 751        }
 752
 753        INIT_LIST_HEAD(&pcdev->capture);
 754        spin_lock_init(&pcdev->lock);
 755
 756        /*
 757         * Request the regions.
 758         */
 759        if (!request_mem_region(res->start, resource_size(res), DRIVER_NAME)) {
 760                err = -EBUSY;
 761                goto exit_kfree;
 762        }
 763
 764        base = ioremap(res->start, resource_size(res));
 765        if (!base) {
 766                err = -ENOMEM;
 767                goto exit_release;
 768        }
 769        pcdev->irq = irq;
 770        pcdev->base = base;
 771
 772        /* request dma */
 773        pcdev->dma_chan = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_HIGH);
 774        if (pcdev->dma_chan < 0) {
 775                dev_err(&pdev->dev, "Can't request DMA for MX1 CSI\n");
 776                err = -EBUSY;
 777                goto exit_iounmap;
 778        }
 779        dev_dbg(&pdev->dev, "got DMA channel %d\n", pcdev->dma_chan);
 780
 781        imx_dma_setup_handlers(pcdev->dma_chan, mx1_camera_dma_irq, NULL,
 782                               pcdev);
 783
 784        imx_dma_config_channel(pcdev->dma_chan, IMX_DMA_TYPE_FIFO,
 785                               IMX_DMA_MEMSIZE_32, MX1_DMA_REQ_CSI_R, 0);
 786        /* burst length : 16 words = 64 bytes */
 787        imx_dma_config_burstlen(pcdev->dma_chan, 0);
 788
 789        /* request irq */
 790        err = claim_fiq(&fh);
 791        if (err) {
 792                dev_err(&pdev->dev, "Camera interrupt register failed \n");
 793                goto exit_free_dma;
 794        }
 795
 796        set_fiq_handler(&mx1_camera_sof_fiq_start, &mx1_camera_sof_fiq_end -
 797                                                   &mx1_camera_sof_fiq_start);
 798
 799        regs.ARM_r8 = (long)MX1_DMA_DIMR;
 800        regs.ARM_r9 = (long)MX1_DMA_CCR(pcdev->dma_chan);
 801        regs.ARM_r10 = (long)pcdev->base + CSICR1;
 802        regs.ARM_fp = (long)pcdev->base + CSISR;
 803        regs.ARM_sp = 1 << pcdev->dma_chan;
 804        set_fiq_regs(&regs);
 805
 806        mxc_set_irq_fiq(irq, 1);
 807        enable_fiq(irq);
 808
 809        pcdev->soc_host.drv_name        = DRIVER_NAME;
 810        pcdev->soc_host.ops             = &mx1_soc_camera_host_ops;
 811        pcdev->soc_host.priv            = pcdev;
 812        pcdev->soc_host.v4l2_dev.dev    = &pdev->dev;
 813        pcdev->soc_host.nr              = pdev->id;
 814        err = soc_camera_host_register(&pcdev->soc_host);
 815        if (err)
 816                goto exit_free_irq;
 817
 818        dev_info(&pdev->dev, "MX1 Camera driver loaded\n");
 819
 820        return 0;
 821
 822exit_free_irq:
 823        disable_fiq(irq);
 824        mxc_set_irq_fiq(irq, 0);
 825        release_fiq(&fh);
 826exit_free_dma:
 827        imx_dma_free(pcdev->dma_chan);
 828exit_iounmap:
 829        iounmap(base);
 830exit_release:
 831        release_mem_region(res->start, resource_size(res));
 832exit_kfree:
 833        kfree(pcdev);
 834exit_put_clk:
 835        clk_put(clk);
 836exit:
 837        return err;
 838}
 839
 840static int __exit mx1_camera_remove(struct platform_device *pdev)
 841{
 842        struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
 843        struct mx1_camera_dev *pcdev = container_of(soc_host,
 844                                        struct mx1_camera_dev, soc_host);
 845        struct resource *res;
 846
 847        imx_dma_free(pcdev->dma_chan);
 848        disable_fiq(pcdev->irq);
 849        mxc_set_irq_fiq(pcdev->irq, 0);
 850        release_fiq(&fh);
 851
 852        clk_put(pcdev->clk);
 853
 854        soc_camera_host_unregister(soc_host);
 855
 856        iounmap(pcdev->base);
 857
 858        res = pcdev->res;
 859        release_mem_region(res->start, resource_size(res));
 860
 861        kfree(pcdev);
 862
 863        dev_info(&pdev->dev, "MX1 Camera driver unloaded\n");
 864
 865        return 0;
 866}
 867
 868static struct platform_driver mx1_camera_driver = {
 869        .driver         = {
 870                .name   = DRIVER_NAME,
 871        },
 872        .remove         = __exit_p(mx1_camera_remove),
 873};
 874
 875static int __init mx1_camera_init(void)
 876{
 877        return platform_driver_probe(&mx1_camera_driver, mx1_camera_probe);
 878}
 879
 880static void __exit mx1_camera_exit(void)
 881{
 882        return platform_driver_unregister(&mx1_camera_driver);
 883}
 884
 885module_init(mx1_camera_init);
 886module_exit(mx1_camera_exit);
 887
 888MODULE_DESCRIPTION("i.MX1/i.MXL SoC Camera Host driver");
 889MODULE_AUTHOR("Paulius Zaleckas <paulius.zaleckas@teltonika.lt>");
 890MODULE_LICENSE("GPL v2");
 891MODULE_ALIAS("platform:" DRIVER_NAME);
 892