linux/drivers/media/video/mx3_camera.c
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   1/*
   2 * V4L2 Driver for i.MX3x camera host
   3 *
   4 * Copyright (C) 2008
   5 * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License version 2 as
   9 * published by the Free Software Foundation.
  10 */
  11
  12#include <linux/init.h>
  13#include <linux/module.h>
  14#include <linux/version.h>
  15#include <linux/videodev2.h>
  16#include <linux/platform_device.h>
  17#include <linux/clk.h>
  18#include <linux/vmalloc.h>
  19#include <linux/interrupt.h>
  20#include <linux/sched.h>
  21
  22#include <media/v4l2-common.h>
  23#include <media/v4l2-dev.h>
  24#include <media/videobuf-dma-contig.h>
  25#include <media/soc_camera.h>
  26#include <media/soc_mediabus.h>
  27
  28#include <mach/ipu.h>
  29#include <mach/mx3_camera.h>
  30
  31#define MX3_CAM_DRV_NAME "mx3-camera"
  32
  33/* CMOS Sensor Interface Registers */
  34#define CSI_REG_START           0x60
  35
  36#define CSI_SENS_CONF           (0x60 - CSI_REG_START)
  37#define CSI_SENS_FRM_SIZE       (0x64 - CSI_REG_START)
  38#define CSI_ACT_FRM_SIZE        (0x68 - CSI_REG_START)
  39#define CSI_OUT_FRM_CTRL        (0x6C - CSI_REG_START)
  40#define CSI_TST_CTRL            (0x70 - CSI_REG_START)
  41#define CSI_CCIR_CODE_1         (0x74 - CSI_REG_START)
  42#define CSI_CCIR_CODE_2         (0x78 - CSI_REG_START)
  43#define CSI_CCIR_CODE_3         (0x7C - CSI_REG_START)
  44#define CSI_FLASH_STROBE_1      (0x80 - CSI_REG_START)
  45#define CSI_FLASH_STROBE_2      (0x84 - CSI_REG_START)
  46
  47#define CSI_SENS_CONF_VSYNC_POL_SHIFT           0
  48#define CSI_SENS_CONF_HSYNC_POL_SHIFT           1
  49#define CSI_SENS_CONF_DATA_POL_SHIFT            2
  50#define CSI_SENS_CONF_PIX_CLK_POL_SHIFT         3
  51#define CSI_SENS_CONF_SENS_PRTCL_SHIFT          4
  52#define CSI_SENS_CONF_SENS_CLKSRC_SHIFT         7
  53#define CSI_SENS_CONF_DATA_FMT_SHIFT            8
  54#define CSI_SENS_CONF_DATA_WIDTH_SHIFT          10
  55#define CSI_SENS_CONF_EXT_VSYNC_SHIFT           15
  56#define CSI_SENS_CONF_DIVRATIO_SHIFT            16
  57
  58#define CSI_SENS_CONF_DATA_FMT_RGB_YUV444       (0UL << CSI_SENS_CONF_DATA_FMT_SHIFT)
  59#define CSI_SENS_CONF_DATA_FMT_YUV422           (2UL << CSI_SENS_CONF_DATA_FMT_SHIFT)
  60#define CSI_SENS_CONF_DATA_FMT_BAYER            (3UL << CSI_SENS_CONF_DATA_FMT_SHIFT)
  61
  62#define MAX_VIDEO_MEM 16
  63
  64struct mx3_camera_buffer {
  65        /* common v4l buffer stuff -- must be first */
  66        struct videobuf_buffer                  vb;
  67        enum v4l2_mbus_pixelcode                code;
  68
  69        /* One descriptot per scatterlist (per frame) */
  70        struct dma_async_tx_descriptor          *txd;
  71
  72        /* We have to "build" a scatterlist ourselves - one element per frame */
  73        struct scatterlist                      sg;
  74};
  75
  76/**
  77 * struct mx3_camera_dev - i.MX3x camera (CSI) object
  78 * @dev:                camera device, to which the coherent buffer is attached
  79 * @icd:                currently attached camera sensor
  80 * @clk:                pointer to clock
  81 * @base:               remapped register base address
  82 * @pdata:              platform data
  83 * @platform_flags:     platform flags
  84 * @mclk:               master clock frequency in Hz
  85 * @capture:            list of capture videobuffers
  86 * @lock:               protects video buffer lists
  87 * @active:             active video buffer
  88 * @idmac_channel:      array of pointers to IPU DMAC DMA channels
  89 * @soc_host:           embedded soc_host object
  90 */
  91struct mx3_camera_dev {
  92        /*
  93         * i.MX3x is only supposed to handle one camera on its Camera Sensor
  94         * Interface. If anyone ever builds hardware to enable more than one
  95         * camera _simultaneously_, they will have to modify this driver too
  96         */
  97        struct soc_camera_device *icd;
  98        struct clk              *clk;
  99
 100        void __iomem            *base;
 101
 102        struct mx3_camera_pdata *pdata;
 103
 104        unsigned long           platform_flags;
 105        unsigned long           mclk;
 106
 107        struct list_head        capture;
 108        spinlock_t              lock;           /* Protects video buffer lists */
 109        struct mx3_camera_buffer *active;
 110
 111        /* IDMAC / dmaengine interface */
 112        struct idmac_channel    *idmac_channel[1];      /* We need one channel */
 113
 114        struct soc_camera_host  soc_host;
 115};
 116
 117struct dma_chan_request {
 118        struct mx3_camera_dev   *mx3_cam;
 119        enum ipu_channel        id;
 120};
 121
 122static u32 csi_reg_read(struct mx3_camera_dev *mx3, off_t reg)
 123{
 124        return __raw_readl(mx3->base + reg);
 125}
 126
 127static void csi_reg_write(struct mx3_camera_dev *mx3, u32 value, off_t reg)
 128{
 129        __raw_writel(value, mx3->base + reg);
 130}
 131
 132/* Called from the IPU IDMAC ISR */
 133static void mx3_cam_dma_done(void *arg)
 134{
 135        struct idmac_tx_desc *desc = to_tx_desc(arg);
 136        struct dma_chan *chan = desc->txd.chan;
 137        struct idmac_channel *ichannel = to_idmac_chan(chan);
 138        struct mx3_camera_dev *mx3_cam = ichannel->client;
 139        struct videobuf_buffer *vb;
 140
 141        dev_dbg(chan->device->dev, "callback cookie %d, active DMA 0x%08x\n",
 142                desc->txd.cookie, mx3_cam->active ? sg_dma_address(&mx3_cam->active->sg) : 0);
 143
 144        spin_lock(&mx3_cam->lock);
 145        if (mx3_cam->active) {
 146                vb = &mx3_cam->active->vb;
 147
 148                list_del_init(&vb->queue);
 149                vb->state = VIDEOBUF_DONE;
 150                do_gettimeofday(&vb->ts);
 151                vb->field_count++;
 152                wake_up(&vb->done);
 153        }
 154
 155        if (list_empty(&mx3_cam->capture)) {
 156                mx3_cam->active = NULL;
 157                spin_unlock(&mx3_cam->lock);
 158
 159                /*
 160                 * stop capture - without further buffers IPU_CHA_BUF0_RDY will
 161                 * not get updated
 162                 */
 163                return;
 164        }
 165
 166        mx3_cam->active = list_entry(mx3_cam->capture.next,
 167                                     struct mx3_camera_buffer, vb.queue);
 168        mx3_cam->active->vb.state = VIDEOBUF_ACTIVE;
 169        spin_unlock(&mx3_cam->lock);
 170}
 171
 172static void free_buffer(struct videobuf_queue *vq, struct mx3_camera_buffer *buf)
 173{
 174        struct soc_camera_device *icd = vq->priv_data;
 175        struct videobuf_buffer *vb = &buf->vb;
 176        struct dma_async_tx_descriptor *txd = buf->txd;
 177        struct idmac_channel *ichan;
 178
 179        BUG_ON(in_interrupt());
 180
 181        dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
 182                vb, vb->baddr, vb->bsize);
 183
 184        /*
 185         * This waits until this buffer is out of danger, i.e., until it is no
 186         * longer in STATE_QUEUED or STATE_ACTIVE
 187         */
 188        videobuf_waiton(vb, 0, 0);
 189        if (txd) {
 190                ichan = to_idmac_chan(txd->chan);
 191                async_tx_ack(txd);
 192        }
 193        videobuf_dma_contig_free(vq, vb);
 194        buf->txd = NULL;
 195
 196        vb->state = VIDEOBUF_NEEDS_INIT;
 197}
 198
 199/*
 200 * Videobuf operations
 201 */
 202
 203/*
 204 * Calculate the __buffer__ (not data) size and number of buffers.
 205 * Called with .vb_lock held
 206 */
 207static int mx3_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
 208                              unsigned int *size)
 209{
 210        struct soc_camera_device *icd = vq->priv_data;
 211        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 212        struct mx3_camera_dev *mx3_cam = ici->priv;
 213        int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 214                                                icd->current_fmt->host_fmt);
 215
 216        if (bytes_per_line < 0)
 217                return bytes_per_line;
 218
 219        if (!mx3_cam->idmac_channel[0])
 220                return -EINVAL;
 221
 222        *size = bytes_per_line * icd->user_height;
 223
 224        if (!*count)
 225                *count = 32;
 226
 227        if (*size * *count > MAX_VIDEO_MEM * 1024 * 1024)
 228                *count = MAX_VIDEO_MEM * 1024 * 1024 / *size;
 229
 230        return 0;
 231}
 232
 233/* Called with .vb_lock held */
 234static int mx3_videobuf_prepare(struct videobuf_queue *vq,
 235                struct videobuf_buffer *vb, enum v4l2_field field)
 236{
 237        struct soc_camera_device *icd = vq->priv_data;
 238        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 239        struct mx3_camera_dev *mx3_cam = ici->priv;
 240        struct mx3_camera_buffer *buf =
 241                container_of(vb, struct mx3_camera_buffer, vb);
 242        size_t new_size;
 243        int ret;
 244        int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
 245                                                icd->current_fmt->host_fmt);
 246
 247        if (bytes_per_line < 0)
 248                return bytes_per_line;
 249
 250        new_size = bytes_per_line * icd->user_height;
 251
 252        /*
 253         * I think, in buf_prepare you only have to protect global data,
 254         * the actual buffer is yours
 255         */
 256
 257        if (buf->code   != icd->current_fmt->code ||
 258            vb->width   != icd->user_width ||
 259            vb->height  != icd->user_height ||
 260            vb->field   != field) {
 261                buf->code       = icd->current_fmt->code;
 262                vb->width       = icd->user_width;
 263                vb->height      = icd->user_height;
 264                vb->field       = field;
 265                if (vb->state != VIDEOBUF_NEEDS_INIT)
 266                        free_buffer(vq, buf);
 267        }
 268
 269        if (vb->baddr && vb->bsize < new_size) {
 270                /* User provided buffer, but it is too small */
 271                ret = -ENOMEM;
 272                goto out;
 273        }
 274
 275        if (vb->state == VIDEOBUF_NEEDS_INIT) {
 276                struct idmac_channel *ichan = mx3_cam->idmac_channel[0];
 277                struct scatterlist *sg = &buf->sg;
 278
 279                /*
 280                 * The total size of video-buffers that will be allocated / mapped.
 281                 * *size that we calculated in videobuf_setup gets assigned to
 282                 * vb->bsize, and now we use the same calculation to get vb->size.
 283                 */
 284                vb->size = new_size;
 285
 286                /* This actually (allocates and) maps buffers */
 287                ret = videobuf_iolock(vq, vb, NULL);
 288                if (ret)
 289                        goto fail;
 290
 291                /*
 292                 * We will have to configure the IDMAC channel. It has two slots
 293                 * for DMA buffers, we shall enter the first two buffers there,
 294                 * and then submit new buffers in DMA-ready interrupts
 295                 */
 296                sg_init_table(sg, 1);
 297                sg_dma_address(sg)      = videobuf_to_dma_contig(vb);
 298                sg_dma_len(sg)          = vb->size;
 299
 300                buf->txd = ichan->dma_chan.device->device_prep_slave_sg(
 301                        &ichan->dma_chan, sg, 1, DMA_FROM_DEVICE,
 302                        DMA_PREP_INTERRUPT);
 303                if (!buf->txd) {
 304                        ret = -EIO;
 305                        goto fail;
 306                }
 307
 308                buf->txd->callback_param        = buf->txd;
 309                buf->txd->callback              = mx3_cam_dma_done;
 310
 311                vb->state = VIDEOBUF_PREPARED;
 312        }
 313
 314        return 0;
 315
 316fail:
 317        free_buffer(vq, buf);
 318out:
 319        return ret;
 320}
 321
 322static enum pixel_fmt fourcc_to_ipu_pix(__u32 fourcc)
 323{
 324        /* Add more formats as need arises and test possibilities appear... */
 325        switch (fourcc) {
 326        case V4L2_PIX_FMT_RGB565:
 327                return IPU_PIX_FMT_RGB565;
 328        case V4L2_PIX_FMT_RGB24:
 329                return IPU_PIX_FMT_RGB24;
 330        case V4L2_PIX_FMT_RGB332:
 331                return IPU_PIX_FMT_RGB332;
 332        case V4L2_PIX_FMT_YUV422P:
 333                return IPU_PIX_FMT_YVU422P;
 334        default:
 335                return IPU_PIX_FMT_GENERIC;
 336        }
 337}
 338
 339/*
 340 * Called with .vb_lock mutex held and
 341 * under spinlock_irqsave(&mx3_cam->lock, ...)
 342 */
 343static void mx3_videobuf_queue(struct videobuf_queue *vq,
 344                               struct videobuf_buffer *vb)
 345{
 346        struct soc_camera_device *icd = vq->priv_data;
 347        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 348        struct mx3_camera_dev *mx3_cam = ici->priv;
 349        struct mx3_camera_buffer *buf =
 350                container_of(vb, struct mx3_camera_buffer, vb);
 351        struct dma_async_tx_descriptor *txd = buf->txd;
 352        struct idmac_channel *ichan = to_idmac_chan(txd->chan);
 353        struct idmac_video_param *video = &ichan->params.video;
 354        dma_cookie_t cookie;
 355        u32 fourcc = icd->current_fmt->host_fmt->fourcc;
 356
 357        BUG_ON(!irqs_disabled());
 358
 359        /* This is the configuration of one sg-element */
 360        video->out_pixel_fmt    = fourcc_to_ipu_pix(fourcc);
 361        video->out_width        = icd->user_width;
 362        video->out_height       = icd->user_height;
 363        video->out_stride       = icd->user_width;
 364
 365#ifdef DEBUG
 366        /* helps to see what DMA actually has written */
 367        memset((void *)vb->baddr, 0xaa, vb->bsize);
 368#endif
 369
 370        list_add_tail(&vb->queue, &mx3_cam->capture);
 371
 372        if (!mx3_cam->active) {
 373                mx3_cam->active = buf;
 374                vb->state = VIDEOBUF_ACTIVE;
 375        } else {
 376                vb->state = VIDEOBUF_QUEUED;
 377        }
 378
 379        spin_unlock_irq(&mx3_cam->lock);
 380
 381        cookie = txd->tx_submit(txd);
 382        dev_dbg(icd->dev.parent, "Submitted cookie %d DMA 0x%08x\n",
 383                cookie, sg_dma_address(&buf->sg));
 384
 385        spin_lock_irq(&mx3_cam->lock);
 386
 387        if (cookie >= 0)
 388                return;
 389
 390        /* Submit error */
 391        vb->state = VIDEOBUF_PREPARED;
 392
 393        list_del_init(&vb->queue);
 394
 395        if (mx3_cam->active == buf)
 396                mx3_cam->active = NULL;
 397}
 398
 399/* Called with .vb_lock held */
 400static void mx3_videobuf_release(struct videobuf_queue *vq,
 401                                 struct videobuf_buffer *vb)
 402{
 403        struct soc_camera_device *icd = vq->priv_data;
 404        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 405        struct mx3_camera_dev *mx3_cam = ici->priv;
 406        struct mx3_camera_buffer *buf =
 407                container_of(vb, struct mx3_camera_buffer, vb);
 408        unsigned long flags;
 409
 410        dev_dbg(icd->dev.parent,
 411                "Release%s DMA 0x%08x (state %d), queue %sempty\n",
 412                mx3_cam->active == buf ? " active" : "", sg_dma_address(&buf->sg),
 413                vb->state, list_empty(&vb->queue) ? "" : "not ");
 414        spin_lock_irqsave(&mx3_cam->lock, flags);
 415        if ((vb->state == VIDEOBUF_ACTIVE || vb->state == VIDEOBUF_QUEUED) &&
 416            !list_empty(&vb->queue)) {
 417                vb->state = VIDEOBUF_ERROR;
 418
 419                list_del_init(&vb->queue);
 420                if (mx3_cam->active == buf)
 421                        mx3_cam->active = NULL;
 422        }
 423        spin_unlock_irqrestore(&mx3_cam->lock, flags);
 424        free_buffer(vq, buf);
 425}
 426
 427static struct videobuf_queue_ops mx3_videobuf_ops = {
 428        .buf_setup      = mx3_videobuf_setup,
 429        .buf_prepare    = mx3_videobuf_prepare,
 430        .buf_queue      = mx3_videobuf_queue,
 431        .buf_release    = mx3_videobuf_release,
 432};
 433
 434static void mx3_camera_init_videobuf(struct videobuf_queue *q,
 435                                     struct soc_camera_device *icd)
 436{
 437        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 438        struct mx3_camera_dev *mx3_cam = ici->priv;
 439
 440        videobuf_queue_dma_contig_init(q, &mx3_videobuf_ops, icd->dev.parent,
 441                                       &mx3_cam->lock,
 442                                       V4L2_BUF_TYPE_VIDEO_CAPTURE,
 443                                       V4L2_FIELD_NONE,
 444                                       sizeof(struct mx3_camera_buffer), icd);
 445}
 446
 447/* First part of ipu_csi_init_interface() */
 448static void mx3_camera_activate(struct mx3_camera_dev *mx3_cam,
 449                                struct soc_camera_device *icd)
 450{
 451        u32 conf;
 452        long rate;
 453
 454        /* Set default size: ipu_csi_set_window_size() */
 455        csi_reg_write(mx3_cam, (640 - 1) | ((480 - 1) << 16), CSI_ACT_FRM_SIZE);
 456        /* ...and position to 0:0: ipu_csi_set_window_pos() */
 457        conf = csi_reg_read(mx3_cam, CSI_OUT_FRM_CTRL) & 0xffff0000;
 458        csi_reg_write(mx3_cam, conf, CSI_OUT_FRM_CTRL);
 459
 460        /* We use only gated clock synchronisation mode so far */
 461        conf = 0 << CSI_SENS_CONF_SENS_PRTCL_SHIFT;
 462
 463        /* Set generic data, platform-biggest bus-width */
 464        conf |= CSI_SENS_CONF_DATA_FMT_BAYER;
 465
 466        if (mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_15)
 467                conf |= 3 << CSI_SENS_CONF_DATA_WIDTH_SHIFT;
 468        else if (mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_10)
 469                conf |= 2 << CSI_SENS_CONF_DATA_WIDTH_SHIFT;
 470        else if (mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_8)
 471                conf |= 1 << CSI_SENS_CONF_DATA_WIDTH_SHIFT;
 472        else/* if (mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_4)*/
 473                conf |= 0 << CSI_SENS_CONF_DATA_WIDTH_SHIFT;
 474
 475        if (mx3_cam->platform_flags & MX3_CAMERA_CLK_SRC)
 476                conf |= 1 << CSI_SENS_CONF_SENS_CLKSRC_SHIFT;
 477        if (mx3_cam->platform_flags & MX3_CAMERA_EXT_VSYNC)
 478                conf |= 1 << CSI_SENS_CONF_EXT_VSYNC_SHIFT;
 479        if (mx3_cam->platform_flags & MX3_CAMERA_DP)
 480                conf |= 1 << CSI_SENS_CONF_DATA_POL_SHIFT;
 481        if (mx3_cam->platform_flags & MX3_CAMERA_PCP)
 482                conf |= 1 << CSI_SENS_CONF_PIX_CLK_POL_SHIFT;
 483        if (mx3_cam->platform_flags & MX3_CAMERA_HSP)
 484                conf |= 1 << CSI_SENS_CONF_HSYNC_POL_SHIFT;
 485        if (mx3_cam->platform_flags & MX3_CAMERA_VSP)
 486                conf |= 1 << CSI_SENS_CONF_VSYNC_POL_SHIFT;
 487
 488        /* ipu_csi_init_interface() */
 489        csi_reg_write(mx3_cam, conf, CSI_SENS_CONF);
 490
 491        clk_enable(mx3_cam->clk);
 492        rate = clk_round_rate(mx3_cam->clk, mx3_cam->mclk);
 493        dev_dbg(icd->dev.parent, "Set SENS_CONF to %x, rate %ld\n", conf, rate);
 494        if (rate)
 495                clk_set_rate(mx3_cam->clk, rate);
 496}
 497
 498/* Called with .video_lock held */
 499static int mx3_camera_add_device(struct soc_camera_device *icd)
 500{
 501        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 502        struct mx3_camera_dev *mx3_cam = ici->priv;
 503
 504        if (mx3_cam->icd)
 505                return -EBUSY;
 506
 507        mx3_camera_activate(mx3_cam, icd);
 508
 509        mx3_cam->icd = icd;
 510
 511        dev_info(icd->dev.parent, "MX3 Camera driver attached to camera %d\n",
 512                 icd->devnum);
 513
 514        return 0;
 515}
 516
 517/* Called with .video_lock held */
 518static void mx3_camera_remove_device(struct soc_camera_device *icd)
 519{
 520        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 521        struct mx3_camera_dev *mx3_cam = ici->priv;
 522        struct idmac_channel **ichan = &mx3_cam->idmac_channel[0];
 523
 524        BUG_ON(icd != mx3_cam->icd);
 525
 526        if (*ichan) {
 527                dma_release_channel(&(*ichan)->dma_chan);
 528                *ichan = NULL;
 529        }
 530
 531        clk_disable(mx3_cam->clk);
 532
 533        mx3_cam->icd = NULL;
 534
 535        dev_info(icd->dev.parent, "MX3 Camera driver detached from camera %d\n",
 536                 icd->devnum);
 537}
 538
 539static bool channel_change_requested(struct soc_camera_device *icd,
 540                                     struct v4l2_rect *rect)
 541{
 542        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 543        struct mx3_camera_dev *mx3_cam = ici->priv;
 544        struct idmac_channel *ichan = mx3_cam->idmac_channel[0];
 545
 546        /* Do buffers have to be re-allocated or channel re-configured? */
 547        return ichan && rect->width * rect->height >
 548                icd->user_width * icd->user_height;
 549}
 550
 551static int test_platform_param(struct mx3_camera_dev *mx3_cam,
 552                               unsigned char buswidth, unsigned long *flags)
 553{
 554        /*
 555         * Platform specified synchronization and pixel clock polarities are
 556         * only a recommendation and are only used during probing. MX3x
 557         * camera interface only works in master mode, i.e., uses HSYNC and
 558         * VSYNC signals from the sensor
 559         */
 560        *flags = SOCAM_MASTER |
 561                SOCAM_HSYNC_ACTIVE_HIGH |
 562                SOCAM_HSYNC_ACTIVE_LOW |
 563                SOCAM_VSYNC_ACTIVE_HIGH |
 564                SOCAM_VSYNC_ACTIVE_LOW |
 565                SOCAM_PCLK_SAMPLE_RISING |
 566                SOCAM_PCLK_SAMPLE_FALLING |
 567                SOCAM_DATA_ACTIVE_HIGH |
 568                SOCAM_DATA_ACTIVE_LOW;
 569
 570        /*
 571         * If requested data width is supported by the platform, use it or any
 572         * possible lower value - i.MX31 is smart enough to schift bits
 573         */
 574        if (mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_15)
 575                *flags |= SOCAM_DATAWIDTH_15 | SOCAM_DATAWIDTH_10 |
 576                        SOCAM_DATAWIDTH_8 | SOCAM_DATAWIDTH_4;
 577        else if (mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_10)
 578                *flags |= SOCAM_DATAWIDTH_10 | SOCAM_DATAWIDTH_8 |
 579                        SOCAM_DATAWIDTH_4;
 580        else if (mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_8)
 581                *flags |= SOCAM_DATAWIDTH_8 | SOCAM_DATAWIDTH_4;
 582        else if (mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_4)
 583                *flags |= SOCAM_DATAWIDTH_4;
 584
 585        switch (buswidth) {
 586        case 15:
 587                if (!(*flags & SOCAM_DATAWIDTH_15))
 588                        return -EINVAL;
 589                break;
 590        case 10:
 591                if (!(*flags & SOCAM_DATAWIDTH_10))
 592                        return -EINVAL;
 593                break;
 594        case 8:
 595                if (!(*flags & SOCAM_DATAWIDTH_8))
 596                        return -EINVAL;
 597                break;
 598        case 4:
 599                if (!(*flags & SOCAM_DATAWIDTH_4))
 600                        return -EINVAL;
 601                break;
 602        default:
 603                dev_warn(mx3_cam->soc_host.v4l2_dev.dev,
 604                         "Unsupported bus width %d\n", buswidth);
 605                return -EINVAL;
 606        }
 607
 608        return 0;
 609}
 610
 611static int mx3_camera_try_bus_param(struct soc_camera_device *icd,
 612                                    const unsigned int depth)
 613{
 614        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 615        struct mx3_camera_dev *mx3_cam = ici->priv;
 616        unsigned long bus_flags, camera_flags;
 617        int ret = test_platform_param(mx3_cam, depth, &bus_flags);
 618
 619        dev_dbg(icd->dev.parent, "request bus width %d bit: %d\n", depth, ret);
 620
 621        if (ret < 0)
 622                return ret;
 623
 624        camera_flags = icd->ops->query_bus_param(icd);
 625
 626        ret = soc_camera_bus_param_compatible(camera_flags, bus_flags);
 627        if (ret < 0)
 628                dev_warn(icd->dev.parent,
 629                         "Flags incompatible: camera %lx, host %lx\n",
 630                         camera_flags, bus_flags);
 631
 632        return ret;
 633}
 634
 635static bool chan_filter(struct dma_chan *chan, void *arg)
 636{
 637        struct dma_chan_request *rq = arg;
 638        struct mx3_camera_pdata *pdata;
 639
 640        if (!rq)
 641                return false;
 642
 643        pdata = rq->mx3_cam->soc_host.v4l2_dev.dev->platform_data;
 644
 645        return rq->id == chan->chan_id &&
 646                pdata->dma_dev == chan->device->dev;
 647}
 648
 649static const struct soc_mbus_pixelfmt mx3_camera_formats[] = {
 650        {
 651                .fourcc                 = V4L2_PIX_FMT_SBGGR8,
 652                .name                   = "Bayer BGGR (sRGB) 8 bit",
 653                .bits_per_sample        = 8,
 654                .packing                = SOC_MBUS_PACKING_NONE,
 655                .order                  = SOC_MBUS_ORDER_LE,
 656        }, {
 657                .fourcc                 = V4L2_PIX_FMT_GREY,
 658                .name                   = "Monochrome 8 bit",
 659                .bits_per_sample        = 8,
 660                .packing                = SOC_MBUS_PACKING_NONE,
 661                .order                  = SOC_MBUS_ORDER_LE,
 662        },
 663};
 664
 665/* This will be corrected as we get more formats */
 666static bool mx3_camera_packing_supported(const struct soc_mbus_pixelfmt *fmt)
 667{
 668        return  fmt->packing == SOC_MBUS_PACKING_NONE ||
 669                (fmt->bits_per_sample == 8 &&
 670                 fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
 671                (fmt->bits_per_sample > 8 &&
 672                 fmt->packing == SOC_MBUS_PACKING_EXTEND16);
 673}
 674
 675static int mx3_camera_get_formats(struct soc_camera_device *icd, unsigned int idx,
 676                                  struct soc_camera_format_xlate *xlate)
 677{
 678        struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 679        struct device *dev = icd->dev.parent;
 680        int formats = 0, ret;
 681        enum v4l2_mbus_pixelcode code;
 682        const struct soc_mbus_pixelfmt *fmt;
 683
 684        ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
 685        if (ret < 0)
 686                /* No more formats */
 687                return 0;
 688
 689        fmt = soc_mbus_get_fmtdesc(code);
 690        if (!fmt) {
 691                dev_err(icd->dev.parent,
 692                        "Invalid format code #%u: %d\n", idx, code);
 693                return 0;
 694        }
 695
 696        /* This also checks support for the requested bits-per-sample */
 697        ret = mx3_camera_try_bus_param(icd, fmt->bits_per_sample);
 698        if (ret < 0)
 699                return 0;
 700
 701        switch (code) {
 702        case V4L2_MBUS_FMT_SBGGR10_1X10:
 703                formats++;
 704                if (xlate) {
 705                        xlate->host_fmt = &mx3_camera_formats[0];
 706                        xlate->code     = code;
 707                        xlate++;
 708                        dev_dbg(dev, "Providing format %s using code %d\n",
 709                                mx3_camera_formats[0].name, code);
 710                }
 711                break;
 712        case V4L2_MBUS_FMT_Y10_1X10:
 713                formats++;
 714                if (xlate) {
 715                        xlate->host_fmt = &mx3_camera_formats[1];
 716                        xlate->code     = code;
 717                        xlate++;
 718                        dev_dbg(dev, "Providing format %s using code %d\n",
 719                                mx3_camera_formats[1].name, code);
 720                }
 721                break;
 722        default:
 723                if (!mx3_camera_packing_supported(fmt))
 724                        return 0;
 725        }
 726
 727        /* Generic pass-through */
 728        formats++;
 729        if (xlate) {
 730                xlate->host_fmt = fmt;
 731                xlate->code     = code;
 732                xlate++;
 733                dev_dbg(dev, "Providing format %x in pass-through mode\n",
 734                        xlate->host_fmt->fourcc);
 735        }
 736
 737        return formats;
 738}
 739
 740static void configure_geometry(struct mx3_camera_dev *mx3_cam,
 741                               unsigned int width, unsigned int height)
 742{
 743        u32 ctrl, width_field, height_field;
 744
 745        /* Setup frame size - this cannot be changed on-the-fly... */
 746        width_field = width - 1;
 747        height_field = height - 1;
 748        csi_reg_write(mx3_cam, width_field | (height_field << 16), CSI_SENS_FRM_SIZE);
 749
 750        csi_reg_write(mx3_cam, width_field << 16, CSI_FLASH_STROBE_1);
 751        csi_reg_write(mx3_cam, (height_field << 16) | 0x22, CSI_FLASH_STROBE_2);
 752
 753        csi_reg_write(mx3_cam, width_field | (height_field << 16), CSI_ACT_FRM_SIZE);
 754
 755        /* ...and position */
 756        ctrl = csi_reg_read(mx3_cam, CSI_OUT_FRM_CTRL) & 0xffff0000;
 757        /* Sensor does the cropping */
 758        csi_reg_write(mx3_cam, ctrl | 0 | (0 << 8), CSI_OUT_FRM_CTRL);
 759}
 760
 761static int acquire_dma_channel(struct mx3_camera_dev *mx3_cam)
 762{
 763        dma_cap_mask_t mask;
 764        struct dma_chan *chan;
 765        struct idmac_channel **ichan = &mx3_cam->idmac_channel[0];
 766        /* We have to use IDMAC_IC_7 for Bayer / generic data */
 767        struct dma_chan_request rq = {.mx3_cam = mx3_cam,
 768                                      .id = IDMAC_IC_7};
 769
 770        if (*ichan) {
 771                struct videobuf_buffer *vb, *_vb;
 772                dma_release_channel(&(*ichan)->dma_chan);
 773                *ichan = NULL;
 774                mx3_cam->active = NULL;
 775                list_for_each_entry_safe(vb, _vb, &mx3_cam->capture, queue) {
 776                        list_del_init(&vb->queue);
 777                        vb->state = VIDEOBUF_ERROR;
 778                        wake_up(&vb->done);
 779                }
 780        }
 781
 782        dma_cap_zero(mask);
 783        dma_cap_set(DMA_SLAVE, mask);
 784        dma_cap_set(DMA_PRIVATE, mask);
 785        chan = dma_request_channel(mask, chan_filter, &rq);
 786        if (!chan)
 787                return -EBUSY;
 788
 789        *ichan = to_idmac_chan(chan);
 790        (*ichan)->client = mx3_cam;
 791
 792        return 0;
 793}
 794
 795/*
 796 * FIXME: learn to use stride != width, then we can keep stride properly aligned
 797 * and support arbitrary (even) widths.
 798 */
 799static inline void stride_align(__u32 *width)
 800{
 801        if (((*width + 7) &  ~7) < 4096)
 802                *width = (*width + 7) &  ~7;
 803        else
 804                *width = *width &  ~7;
 805}
 806
 807/*
 808 * As long as we don't implement host-side cropping and scaling, we can use
 809 * default g_crop and cropcap from soc_camera.c
 810 */
 811static int mx3_camera_set_crop(struct soc_camera_device *icd,
 812                               struct v4l2_crop *a)
 813{
 814        struct v4l2_rect *rect = &a->c;
 815        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 816        struct mx3_camera_dev *mx3_cam = ici->priv;
 817        struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 818        struct v4l2_mbus_framefmt mf;
 819        int ret;
 820
 821        soc_camera_limit_side(&rect->left, &rect->width, 0, 2, 4096);
 822        soc_camera_limit_side(&rect->top, &rect->height, 0, 2, 4096);
 823
 824        ret = v4l2_subdev_call(sd, video, s_crop, a);
 825        if (ret < 0)
 826                return ret;
 827
 828        /* The capture device might have changed its output  */
 829        ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
 830        if (ret < 0)
 831                return ret;
 832
 833        if (mf.width & 7) {
 834                /* Ouch! We can only handle 8-byte aligned width... */
 835                stride_align(&mf.width);
 836                ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
 837                if (ret < 0)
 838                        return ret;
 839        }
 840
 841        if (mf.width != icd->user_width || mf.height != icd->user_height) {
 842                /*
 843                 * We now know pixel formats and can decide upon DMA-channel(s)
 844                 * So far only direct camera-to-memory is supported
 845                 */
 846                if (channel_change_requested(icd, rect)) {
 847                        ret = acquire_dma_channel(mx3_cam);
 848                        if (ret < 0)
 849                                return ret;
 850                }
 851
 852                configure_geometry(mx3_cam, mf.width, mf.height);
 853        }
 854
 855        dev_dbg(icd->dev.parent, "Sensor cropped %dx%d\n",
 856                mf.width, mf.height);
 857
 858        icd->user_width         = mf.width;
 859        icd->user_height        = mf.height;
 860
 861        return ret;
 862}
 863
 864static int mx3_camera_set_fmt(struct soc_camera_device *icd,
 865                              struct v4l2_format *f)
 866{
 867        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
 868        struct mx3_camera_dev *mx3_cam = ici->priv;
 869        struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 870        const struct soc_camera_format_xlate *xlate;
 871        struct v4l2_pix_format *pix = &f->fmt.pix;
 872        struct v4l2_mbus_framefmt mf;
 873        int ret;
 874
 875        xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
 876        if (!xlate) {
 877                dev_warn(icd->dev.parent, "Format %x not found\n",
 878                         pix->pixelformat);
 879                return -EINVAL;
 880        }
 881
 882        stride_align(&pix->width);
 883        dev_dbg(icd->dev.parent, "Set format %dx%d\n", pix->width, pix->height);
 884
 885        ret = acquire_dma_channel(mx3_cam);
 886        if (ret < 0)
 887                return ret;
 888
 889        /*
 890         * Might have to perform a complete interface initialisation like in
 891         * ipu_csi_init_interface() in mxc_v4l2_s_param(). Also consider
 892         * mxc_v4l2_s_fmt()
 893         */
 894
 895        configure_geometry(mx3_cam, pix->width, pix->height);
 896
 897        mf.width        = pix->width;
 898        mf.height       = pix->height;
 899        mf.field        = pix->field;
 900        mf.colorspace   = pix->colorspace;
 901        mf.code         = xlate->code;
 902
 903        ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
 904        if (ret < 0)
 905                return ret;
 906
 907        if (mf.code != xlate->code)
 908                return -EINVAL;
 909
 910        pix->width              = mf.width;
 911        pix->height             = mf.height;
 912        pix->field              = mf.field;
 913        pix->colorspace         = mf.colorspace;
 914        icd->current_fmt        = xlate;
 915
 916        dev_dbg(icd->dev.parent, "Sensor set %dx%d\n", pix->width, pix->height);
 917
 918        return ret;
 919}
 920
 921static int mx3_camera_try_fmt(struct soc_camera_device *icd,
 922                              struct v4l2_format *f)
 923{
 924        struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
 925        const struct soc_camera_format_xlate *xlate;
 926        struct v4l2_pix_format *pix = &f->fmt.pix;
 927        struct v4l2_mbus_framefmt mf;
 928        __u32 pixfmt = pix->pixelformat;
 929        int ret;
 930
 931        xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
 932        if (pixfmt && !xlate) {
 933                dev_warn(icd->dev.parent, "Format %x not found\n", pixfmt);
 934                return -EINVAL;
 935        }
 936
 937        /* limit to MX3 hardware capabilities */
 938        if (pix->height > 4096)
 939                pix->height = 4096;
 940        if (pix->width > 4096)
 941                pix->width = 4096;
 942
 943        pix->bytesperline = soc_mbus_bytes_per_line(pix->width,
 944                                                    xlate->host_fmt);
 945        if (pix->bytesperline < 0)
 946                return pix->bytesperline;
 947        pix->sizeimage = pix->height * pix->bytesperline;
 948
 949        /* limit to sensor capabilities */
 950        mf.width        = pix->width;
 951        mf.height       = pix->height;
 952        mf.field        = pix->field;
 953        mf.colorspace   = pix->colorspace;
 954        mf.code         = xlate->code;
 955
 956        ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
 957        if (ret < 0)
 958                return ret;
 959
 960        pix->width      = mf.width;
 961        pix->height     = mf.height;
 962        pix->colorspace = mf.colorspace;
 963
 964        switch (mf.field) {
 965        case V4L2_FIELD_ANY:
 966                pix->field = V4L2_FIELD_NONE;
 967                break;
 968        case V4L2_FIELD_NONE:
 969                break;
 970        default:
 971                dev_err(icd->dev.parent, "Field type %d unsupported.\n",
 972                        mf.field);
 973                ret = -EINVAL;
 974        }
 975
 976        return ret;
 977}
 978
 979static int mx3_camera_reqbufs(struct soc_camera_file *icf,
 980                              struct v4l2_requestbuffers *p)
 981{
 982        return 0;
 983}
 984
 985static unsigned int mx3_camera_poll(struct file *file, poll_table *pt)
 986{
 987        struct soc_camera_file *icf = file->private_data;
 988
 989        return videobuf_poll_stream(file, &icf->vb_vidq, pt);
 990}
 991
 992static int mx3_camera_querycap(struct soc_camera_host *ici,
 993                               struct v4l2_capability *cap)
 994{
 995        /* cap->name is set by the firendly caller:-> */
 996        strlcpy(cap->card, "i.MX3x Camera", sizeof(cap->card));
 997        cap->version = KERNEL_VERSION(0, 2, 2);
 998        cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
 999
1000        return 0;
1001}
1002
1003static int mx3_camera_set_bus_param(struct soc_camera_device *icd, __u32 pixfmt)
1004{
1005        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1006        struct mx3_camera_dev *mx3_cam = ici->priv;
1007        unsigned long bus_flags, camera_flags, common_flags;
1008        u32 dw, sens_conf;
1009        const struct soc_mbus_pixelfmt *fmt;
1010        int buswidth;
1011        int ret;
1012        const struct soc_camera_format_xlate *xlate;
1013        struct device *dev = icd->dev.parent;
1014
1015        fmt = soc_mbus_get_fmtdesc(icd->current_fmt->code);
1016        if (!fmt)
1017                return -EINVAL;
1018
1019        buswidth = fmt->bits_per_sample;
1020        ret = test_platform_param(mx3_cam, buswidth, &bus_flags);
1021
1022        xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1023        if (!xlate) {
1024                dev_warn(dev, "Format %x not found\n", pixfmt);
1025                return -EINVAL;
1026        }
1027
1028        dev_dbg(dev, "requested bus width %d bit: %d\n", buswidth, ret);
1029
1030        if (ret < 0)
1031                return ret;
1032
1033        camera_flags = icd->ops->query_bus_param(icd);
1034
1035        common_flags = soc_camera_bus_param_compatible(camera_flags, bus_flags);
1036        dev_dbg(dev, "Flags cam: 0x%lx host: 0x%lx common: 0x%lx\n",
1037                camera_flags, bus_flags, common_flags);
1038        if (!common_flags) {
1039                dev_dbg(dev, "no common flags");
1040                return -EINVAL;
1041        }
1042
1043        /* Make choices, based on platform preferences */
1044        if ((common_flags & SOCAM_HSYNC_ACTIVE_HIGH) &&
1045            (common_flags & SOCAM_HSYNC_ACTIVE_LOW)) {
1046                if (mx3_cam->platform_flags & MX3_CAMERA_HSP)
1047                        common_flags &= ~SOCAM_HSYNC_ACTIVE_HIGH;
1048                else
1049                        common_flags &= ~SOCAM_HSYNC_ACTIVE_LOW;
1050        }
1051
1052        if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) &&
1053            (common_flags & SOCAM_VSYNC_ACTIVE_LOW)) {
1054                if (mx3_cam->platform_flags & MX3_CAMERA_VSP)
1055                        common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH;
1056                else
1057                        common_flags &= ~SOCAM_VSYNC_ACTIVE_LOW;
1058        }
1059
1060        if ((common_flags & SOCAM_DATA_ACTIVE_HIGH) &&
1061            (common_flags & SOCAM_DATA_ACTIVE_LOW)) {
1062                if (mx3_cam->platform_flags & MX3_CAMERA_DP)
1063                        common_flags &= ~SOCAM_DATA_ACTIVE_HIGH;
1064                else
1065                        common_flags &= ~SOCAM_DATA_ACTIVE_LOW;
1066        }
1067
1068        if ((common_flags & SOCAM_PCLK_SAMPLE_RISING) &&
1069            (common_flags & SOCAM_PCLK_SAMPLE_FALLING)) {
1070                if (mx3_cam->platform_flags & MX3_CAMERA_PCP)
1071                        common_flags &= ~SOCAM_PCLK_SAMPLE_RISING;
1072                else
1073                        common_flags &= ~SOCAM_PCLK_SAMPLE_FALLING;
1074        }
1075
1076        /*
1077         * Make the camera work in widest common mode, we'll take care of
1078         * the rest
1079         */
1080        if (common_flags & SOCAM_DATAWIDTH_15)
1081                common_flags = (common_flags & ~SOCAM_DATAWIDTH_MASK) |
1082                        SOCAM_DATAWIDTH_15;
1083        else if (common_flags & SOCAM_DATAWIDTH_10)
1084                common_flags = (common_flags & ~SOCAM_DATAWIDTH_MASK) |
1085                        SOCAM_DATAWIDTH_10;
1086        else if (common_flags & SOCAM_DATAWIDTH_8)
1087                common_flags = (common_flags & ~SOCAM_DATAWIDTH_MASK) |
1088                        SOCAM_DATAWIDTH_8;
1089        else
1090                common_flags = (common_flags & ~SOCAM_DATAWIDTH_MASK) |
1091                        SOCAM_DATAWIDTH_4;
1092
1093        ret = icd->ops->set_bus_param(icd, common_flags);
1094        if (ret < 0) {
1095                dev_dbg(dev, "camera set_bus_param(%lx) returned %d\n",
1096                        common_flags, ret);
1097                return ret;
1098        }
1099
1100        /*
1101         * So far only gated clock mode is supported. Add a line
1102         *      (3 << CSI_SENS_CONF_SENS_PRTCL_SHIFT) |
1103         * below and select the required mode when supporting other
1104         * synchronisation protocols.
1105         */
1106        sens_conf = csi_reg_read(mx3_cam, CSI_SENS_CONF) &
1107                ~((1 << CSI_SENS_CONF_VSYNC_POL_SHIFT) |
1108                  (1 << CSI_SENS_CONF_HSYNC_POL_SHIFT) |
1109                  (1 << CSI_SENS_CONF_DATA_POL_SHIFT) |
1110                  (1 << CSI_SENS_CONF_PIX_CLK_POL_SHIFT) |
1111                  (3 << CSI_SENS_CONF_DATA_FMT_SHIFT) |
1112                  (3 << CSI_SENS_CONF_DATA_WIDTH_SHIFT));
1113
1114        /* TODO: Support RGB and YUV formats */
1115
1116        /* This has been set in mx3_camera_activate(), but we clear it above */
1117        sens_conf |= CSI_SENS_CONF_DATA_FMT_BAYER;
1118
1119        if (common_flags & SOCAM_PCLK_SAMPLE_FALLING)
1120                sens_conf |= 1 << CSI_SENS_CONF_PIX_CLK_POL_SHIFT;
1121        if (common_flags & SOCAM_HSYNC_ACTIVE_LOW)
1122                sens_conf |= 1 << CSI_SENS_CONF_HSYNC_POL_SHIFT;
1123        if (common_flags & SOCAM_VSYNC_ACTIVE_LOW)
1124                sens_conf |= 1 << CSI_SENS_CONF_VSYNC_POL_SHIFT;
1125        if (common_flags & SOCAM_DATA_ACTIVE_LOW)
1126                sens_conf |= 1 << CSI_SENS_CONF_DATA_POL_SHIFT;
1127
1128        /* Just do what we're asked to do */
1129        switch (xlate->host_fmt->bits_per_sample) {
1130        case 4:
1131                dw = 0 << CSI_SENS_CONF_DATA_WIDTH_SHIFT;
1132                break;
1133        case 8:
1134                dw = 1 << CSI_SENS_CONF_DATA_WIDTH_SHIFT;
1135                break;
1136        case 10:
1137                dw = 2 << CSI_SENS_CONF_DATA_WIDTH_SHIFT;
1138                break;
1139        default:
1140                /*
1141                 * Actually it can only be 15 now, default is just to silence
1142                 * compiler warnings
1143                 */
1144        case 15:
1145                dw = 3 << CSI_SENS_CONF_DATA_WIDTH_SHIFT;
1146        }
1147
1148        csi_reg_write(mx3_cam, sens_conf | dw, CSI_SENS_CONF);
1149
1150        dev_dbg(dev, "Set SENS_CONF to %x\n", sens_conf | dw);
1151
1152        return 0;
1153}
1154
1155static struct soc_camera_host_ops mx3_soc_camera_host_ops = {
1156        .owner          = THIS_MODULE,
1157        .add            = mx3_camera_add_device,
1158        .remove         = mx3_camera_remove_device,
1159        .set_crop       = mx3_camera_set_crop,
1160        .set_fmt        = mx3_camera_set_fmt,
1161        .try_fmt        = mx3_camera_try_fmt,
1162        .get_formats    = mx3_camera_get_formats,
1163        .init_videobuf  = mx3_camera_init_videobuf,
1164        .reqbufs        = mx3_camera_reqbufs,
1165        .poll           = mx3_camera_poll,
1166        .querycap       = mx3_camera_querycap,
1167        .set_bus_param  = mx3_camera_set_bus_param,
1168};
1169
1170static int __devinit mx3_camera_probe(struct platform_device *pdev)
1171{
1172        struct mx3_camera_dev *mx3_cam;
1173        struct resource *res;
1174        void __iomem *base;
1175        int err = 0;
1176        struct soc_camera_host *soc_host;
1177
1178        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1179        if (!res) {
1180                err = -ENODEV;
1181                goto egetres;
1182        }
1183
1184        mx3_cam = vmalloc(sizeof(*mx3_cam));
1185        if (!mx3_cam) {
1186                dev_err(&pdev->dev, "Could not allocate mx3 camera object\n");
1187                err = -ENOMEM;
1188                goto ealloc;
1189        }
1190        memset(mx3_cam, 0, sizeof(*mx3_cam));
1191
1192        mx3_cam->clk = clk_get(&pdev->dev, NULL);
1193        if (IS_ERR(mx3_cam->clk)) {
1194                err = PTR_ERR(mx3_cam->clk);
1195                goto eclkget;
1196        }
1197
1198        mx3_cam->pdata = pdev->dev.platform_data;
1199        mx3_cam->platform_flags = mx3_cam->pdata->flags;
1200        if (!(mx3_cam->platform_flags & (MX3_CAMERA_DATAWIDTH_4 |
1201                        MX3_CAMERA_DATAWIDTH_8 | MX3_CAMERA_DATAWIDTH_10 |
1202                        MX3_CAMERA_DATAWIDTH_15))) {
1203                /*
1204                 * Platform hasn't set available data widths. This is bad.
1205                 * Warn and use a default.
1206                 */
1207                dev_warn(&pdev->dev, "WARNING! Platform hasn't set available "
1208                         "data widths, using default 8 bit\n");
1209                mx3_cam->platform_flags |= MX3_CAMERA_DATAWIDTH_8;
1210        }
1211
1212        mx3_cam->mclk = mx3_cam->pdata->mclk_10khz * 10000;
1213        if (!mx3_cam->mclk) {
1214                dev_warn(&pdev->dev,
1215                         "mclk_10khz == 0! Please, fix your platform data. "
1216                         "Using default 20MHz\n");
1217                mx3_cam->mclk = 20000000;
1218        }
1219
1220        /* list of video-buffers */
1221        INIT_LIST_HEAD(&mx3_cam->capture);
1222        spin_lock_init(&mx3_cam->lock);
1223
1224        base = ioremap(res->start, resource_size(res));
1225        if (!base) {
1226                pr_err("Couldn't map %x@%x\n", resource_size(res), res->start);
1227                err = -ENOMEM;
1228                goto eioremap;
1229        }
1230
1231        mx3_cam->base   = base;
1232
1233        soc_host                = &mx3_cam->soc_host;
1234        soc_host->drv_name      = MX3_CAM_DRV_NAME;
1235        soc_host->ops           = &mx3_soc_camera_host_ops;
1236        soc_host->priv          = mx3_cam;
1237        soc_host->v4l2_dev.dev  = &pdev->dev;
1238        soc_host->nr            = pdev->id;
1239
1240        err = soc_camera_host_register(soc_host);
1241        if (err)
1242                goto ecamhostreg;
1243
1244        /* IDMAC interface */
1245        dmaengine_get();
1246
1247        return 0;
1248
1249ecamhostreg:
1250        iounmap(base);
1251eioremap:
1252        clk_put(mx3_cam->clk);
1253eclkget:
1254        vfree(mx3_cam);
1255ealloc:
1256egetres:
1257        return err;
1258}
1259
1260static int __devexit mx3_camera_remove(struct platform_device *pdev)
1261{
1262        struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
1263        struct mx3_camera_dev *mx3_cam = container_of(soc_host,
1264                                        struct mx3_camera_dev, soc_host);
1265
1266        clk_put(mx3_cam->clk);
1267
1268        soc_camera_host_unregister(soc_host);
1269
1270        iounmap(mx3_cam->base);
1271
1272        /*
1273         * The channel has either not been allocated,
1274         * or should have been released
1275         */
1276        if (WARN_ON(mx3_cam->idmac_channel[0]))
1277                dma_release_channel(&mx3_cam->idmac_channel[0]->dma_chan);
1278
1279        vfree(mx3_cam);
1280
1281        dmaengine_put();
1282
1283        dev_info(&pdev->dev, "i.MX3x Camera driver unloaded\n");
1284
1285        return 0;
1286}
1287
1288static struct platform_driver mx3_camera_driver = {
1289        .driver         = {
1290                .name   = MX3_CAM_DRV_NAME,
1291        },
1292        .probe          = mx3_camera_probe,
1293        .remove         = __devexit_p(mx3_camera_remove),
1294};
1295
1296
1297static int __init mx3_camera_init(void)
1298{
1299        return platform_driver_register(&mx3_camera_driver);
1300}
1301
1302static void __exit mx3_camera_exit(void)
1303{
1304        platform_driver_unregister(&mx3_camera_driver);
1305}
1306
1307module_init(mx3_camera_init);
1308module_exit(mx3_camera_exit);
1309
1310MODULE_DESCRIPTION("i.MX3x SoC Camera Host driver");
1311MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
1312MODULE_LICENSE("GPL v2");
1313MODULE_ALIAS("platform:" MX3_CAM_DRV_NAME);
1314