ispccdc.c

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/*
 * ispccdc.c
 *
 * TI OMAP3 ISP - CCDC module
 *
 * Copyright (C) 2009-2010 Nokia Corporation
 * Copyright (C) 2009 Texas Instruments, Inc.
 *
 * Contacts: Laurent Pinchart <[email protected]>
 *       Sakari Ailus <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <media/v4l2-event.h>

#include "isp.h"
#include "ispreg.h"
#include "ispccdc.h"

#define CCDC_MIN_WIDTH      32
#define CCDC_MIN_HEIGHT     32

static struct v4l2_mbus_framefmt *
__ccdc_get_format(struct isp_ccdc_device *ccdc, struct v4l2_subdev_fh *fh,
          unsigned int pad, enum v4l2_subdev_format_whence which);

static const unsigned int ccdc_fmts[] = {
    V4L2_MBUS_FMT_Y8_1X8,
    V4L2_MBUS_FMT_Y10_1X10,
    V4L2_MBUS_FMT_Y12_1X12,
    V4L2_MBUS_FMT_SGRBG8_1X8,
    V4L2_MBUS_FMT_SRGGB8_1X8,
    V4L2_MBUS_FMT_SBGGR8_1X8,
    V4L2_MBUS_FMT_SGBRG8_1X8,
    V4L2_MBUS_FMT_SGRBG10_1X10,
    V4L2_MBUS_FMT_SRGGB10_1X10,
    V4L2_MBUS_FMT_SBGGR10_1X10,
    V4L2_MBUS_FMT_SGBRG10_1X10,
    V4L2_MBUS_FMT_SGRBG12_1X12,
    V4L2_MBUS_FMT_SRGGB12_1X12,
    V4L2_MBUS_FMT_SBGGR12_1X12,
    V4L2_MBUS_FMT_SGBRG12_1X12,
    V4L2_MBUS_FMT_YUYV8_2X8,
    V4L2_MBUS_FMT_UYVY8_2X8,
};

/*
 * ccdc_print_status - Print current CCDC Module register values.
 * @ccdc: Pointer to ISP CCDC device.
 *
 * Also prints other debug information stored in the CCDC module.
 */
#define CCDC_PRINT_REGISTER(isp, name)\
    dev_dbg(isp->dev, "###CCDC " #name "=0x%08x\n", \
        isp_reg_readl(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_##name))

static void ccdc_print_status(struct isp_ccdc_device *ccdc)
{
    struct isp_device *isp = to_isp_device(ccdc);

    dev_dbg(isp->dev, "-------------CCDC Register dump-------------\n");

    CCDC_PRINT_REGISTER(isp, PCR);
    CCDC_PRINT_REGISTER(isp, SYN_MODE);
    CCDC_PRINT_REGISTER(isp, HD_VD_WID);
    CCDC_PRINT_REGISTER(isp, PIX_LINES);
    CCDC_PRINT_REGISTER(isp, HORZ_INFO);
    CCDC_PRINT_REGISTER(isp, VERT_START);
    CCDC_PRINT_REGISTER(isp, VERT_LINES);
    CCDC_PRINT_REGISTER(isp, CULLING);
    CCDC_PRINT_REGISTER(isp, HSIZE_OFF);
    CCDC_PRINT_REGISTER(isp, SDOFST);
    CCDC_PRINT_REGISTER(isp, SDR_ADDR);
    CCDC_PRINT_REGISTER(isp, CLAMP);
    CCDC_PRINT_REGISTER(isp, DCSUB);
    CCDC_PRINT_REGISTER(isp, COLPTN);
    CCDC_PRINT_REGISTER(isp, BLKCMP);
    CCDC_PRINT_REGISTER(isp, FPC);
    CCDC_PRINT_REGISTER(isp, FPC_ADDR);
    CCDC_PRINT_REGISTER(isp, VDINT);
    CCDC_PRINT_REGISTER(isp, ALAW);
    CCDC_PRINT_REGISTER(isp, REC656IF);
    CCDC_PRINT_REGISTER(isp, CFG);
    CCDC_PRINT_REGISTER(isp, FMTCFG);
    CCDC_PRINT_REGISTER(isp, FMT_HORZ);
    CCDC_PRINT_REGISTER(isp, FMT_VERT);
    CCDC_PRINT_REGISTER(isp, PRGEVEN0);
    CCDC_PRINT_REGISTER(isp, PRGEVEN1);
    CCDC_PRINT_REGISTER(isp, PRGODD0);
    CCDC_PRINT_REGISTER(isp, PRGODD1);
    CCDC_PRINT_REGISTER(isp, VP_OUT);
    CCDC_PRINT_REGISTER(isp, LSC_CONFIG);
    CCDC_PRINT_REGISTER(isp, LSC_INITIAL);
    CCDC_PRINT_REGISTER(isp, LSC_TABLE_BASE);
    CCDC_PRINT_REGISTER(isp, LSC_TABLE_OFFSET);

    dev_dbg(isp->dev, "--------------------------------------------\n");
}

/*
 * omap3isp_ccdc_busy - Get busy state of the CCDC.
 * @ccdc: Pointer to ISP CCDC device.
 */
int omap3isp_ccdc_busy(struct isp_ccdc_device *ccdc)
{
    struct isp_device *isp = to_isp_device(ccdc);

    return isp_reg_readl(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_PCR) &
        ISPCCDC_PCR_BUSY;
}

/* -----------------------------------------------------------------------------
 * Lens Shading Compensation
 */

/*
 * ccdc_lsc_validate_config - Check that LSC configuration is valid.
 * @ccdc: Pointer to ISP CCDC device.
 * @lsc_cfg: the LSC configuration to check.
 *
 * Returns 0 if the LSC configuration is valid, or -EINVAL if invalid.
 */
static int ccdc_lsc_validate_config(struct isp_ccdc_device *ccdc,
                    struct omap3isp_ccdc_lsc_config *lsc_cfg)
{
    struct isp_device *isp = to_isp_device(ccdc);
    struct v4l2_mbus_framefmt *format;
    unsigned int paxel_width, paxel_height;
    unsigned int paxel_shift_x, paxel_shift_y;
    unsigned int min_width, min_height, min_size;
    unsigned int input_width, input_height;

    paxel_shift_x = lsc_cfg->gain_mode_m;
    paxel_shift_y = lsc_cfg->gain_mode_n;

    if ((paxel_shift_x < 2) || (paxel_shift_x > 6) ||
        (paxel_shift_y < 2) || (paxel_shift_y > 6)) {
        dev_dbg(isp->dev, "CCDC: LSC: Invalid paxel size\n");
        return -EINVAL;
    }

    if (lsc_cfg->offset & 3) {
        dev_dbg(isp->dev, "CCDC: LSC: Offset must be a multiple of "
            "4\n");
        return -EINVAL;
    }

    if ((lsc_cfg->initial_x & 1) || (lsc_cfg->initial_y & 1)) {
        dev_dbg(isp->dev, "CCDC: LSC: initial_x and y must be even\n");
        return -EINVAL;
    }

    format = __ccdc_get_format(ccdc, NULL, CCDC_PAD_SINK,
                   V4L2_SUBDEV_FORMAT_ACTIVE);
    input_width = format->width;
    input_height = format->height;

    /* Calculate minimum bytesize for validation */
    paxel_width = 1 << paxel_shift_x;
    min_width = ((input_width + lsc_cfg->initial_x + paxel_width - 1)
             >> paxel_shift_x) + 1;

    paxel_height = 1 << paxel_shift_y;
    min_height = ((input_height + lsc_cfg->initial_y + paxel_height - 1)
             >> paxel_shift_y) + 1;

    min_size = 4 * min_width * min_height;
    if (min_size > lsc_cfg->size) {
        dev_dbg(isp->dev, "CCDC: LSC: too small table\n");
        return -EINVAL;
    }
    if (lsc_cfg->offset < (min_width * 4)) {
        dev_dbg(isp->dev, "CCDC: LSC: Offset is too small\n");
        return -EINVAL;
    }
    if ((lsc_cfg->size / lsc_cfg->offset) < min_height) {
        dev_dbg(isp->dev, "CCDC: LSC: Wrong size/offset combination\n");
        return -EINVAL;
    }
    return 0;
}

/*
 * ccdc_lsc_program_table - Program Lens Shading Compensation table address.
 * @ccdc: Pointer to ISP CCDC device.
 */
static void ccdc_lsc_program_table(struct isp_ccdc_device *ccdc, u32 addr)
{
    isp_reg_writel(to_isp_device(ccdc), addr,
               OMAP3_ISP_IOMEM_CCDC, ISPCCDC_LSC_TABLE_BASE);
}

/*
 * ccdc_lsc_setup_regs - Configures the lens shading compensation module
 * @ccdc: Pointer to ISP CCDC device.
 */
static void ccdc_lsc_setup_regs(struct isp_ccdc_device *ccdc,
                struct omap3isp_ccdc_lsc_config *cfg)
{
    struct isp_device *isp = to_isp_device(ccdc);
    int reg;

    isp_reg_writel(isp, cfg->offset, OMAP3_ISP_IOMEM_CCDC,
               ISPCCDC_LSC_TABLE_OFFSET);

    reg = 0;
    reg |= cfg->gain_mode_n << ISPCCDC_LSC_GAIN_MODE_N_SHIFT;
    reg |= cfg->gain_mode_m << ISPCCDC_LSC_GAIN_MODE_M_SHIFT;
    reg |= cfg->gain_format << ISPCCDC_LSC_GAIN_FORMAT_SHIFT;
    isp_reg_writel(isp, reg, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_LSC_CONFIG);

    reg = 0;
    reg &= ~ISPCCDC_LSC_INITIAL_X_MASK;
    reg |= cfg->initial_x << ISPCCDC_LSC_INITIAL_X_SHIFT;
    reg &= ~ISPCCDC_LSC_INITIAL_Y_MASK;
    reg |= cfg->initial_y << ISPCCDC_LSC_INITIAL_Y_SHIFT;
    isp_reg_writel(isp, reg, OMAP3_ISP_IOMEM_CCDC,
               ISPCCDC_LSC_INITIAL);
}

static int ccdc_lsc_wait_prefetch(struct isp_ccdc_device *ccdc)
{
    struct isp_device *isp = to_isp_device(ccdc);
    unsigned int wait;

    isp_reg_writel(isp, IRQ0STATUS_CCDC_LSC_PREF_COMP_IRQ,
               OMAP3_ISP_IOMEM_MAIN, ISP_IRQ0STATUS);

    /* timeout 1 ms */
    for (wait = 0; wait < 1000; wait++) {
        if (isp_reg_readl(isp, OMAP3_ISP_IOMEM_MAIN, ISP_IRQ0STATUS) &
                  IRQ0STATUS_CCDC_LSC_PREF_COMP_IRQ) {
            isp_reg_writel(isp, IRQ0STATUS_CCDC_LSC_PREF_COMP_IRQ,
                       OMAP3_ISP_IOMEM_MAIN, ISP_IRQ0STATUS);
            return 0;
        }

        rmb();
        udelay(1);
    }

    return -ETIMEDOUT;
}

/*
 * __ccdc_lsc_enable - Enables/Disables the Lens Shading Compensation module.
 * @ccdc: Pointer to ISP CCDC device.
 * @enable: 0 Disables LSC, 1 Enables LSC.
 */
static int __ccdc_lsc_enable(struct isp_ccdc_device *ccdc, int enable)
{
    struct isp_device *isp = to_isp_device(ccdc);
    const struct v4l2_mbus_framefmt *format =
        __ccdc_get_format(ccdc, NULL, CCDC_PAD_SINK,
                  V4L2_SUBDEV_FORMAT_ACTIVE);

    if ((format->code != V4L2_MBUS_FMT_SGRBG10_1X10) &&
        (format->code != V4L2_MBUS_FMT_SRGGB10_1X10) &&
        (format->code != V4L2_MBUS_FMT_SBGGR10_1X10) &&
        (format->code != V4L2_MBUS_FMT_SGBRG10_1X10))
        return -EINVAL;

    if (enable)
        omap3isp_sbl_enable(isp, OMAP3_ISP_SBL_CCDC_LSC_READ);

    isp_reg_clr_set(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_LSC_CONFIG,
            ISPCCDC_LSC_ENABLE, enable ? ISPCCDC_LSC_ENABLE : 0);

    if (enable) {
        if (ccdc_lsc_wait_prefetch(ccdc) < 0) {
            isp_reg_clr(isp, OMAP3_ISP_IOMEM_CCDC,
                    ISPCCDC_LSC_CONFIG, ISPCCDC_LSC_ENABLE);
            ccdc->lsc.state = LSC_STATE_STOPPED;
            dev_warn(to_device(ccdc), "LSC prefecth timeout\n");
            return -ETIMEDOUT;
        }
        ccdc->lsc.state = LSC_STATE_RUNNING;
    } else {
        ccdc->lsc.state = LSC_STATE_STOPPING;
    }

    return 0;
}

static int ccdc_lsc_busy(struct isp_ccdc_device *ccdc)
{
    struct isp_device *isp = to_isp_device(ccdc);

    return isp_reg_readl(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_LSC_CONFIG) &
                 ISPCCDC_LSC_BUSY;
}

/* __ccdc_lsc_configure - Apply a new configuration to the LSC engine
 * @ccdc: Pointer to ISP CCDC device
 * @req: New configuration request
 *
 * context: in_interrupt()
 */
static int __ccdc_lsc_configure(struct isp_ccdc_device *ccdc,
                struct ispccdc_lsc_config_req *req)
{
    if (!req->enable)
        return -EINVAL;

    if (ccdc_lsc_validate_config(ccdc, &req->config) < 0) {
        dev_dbg(to_device(ccdc), "Discard LSC configuration\n");
        return -EINVAL;
    }

    if (ccdc_lsc_busy(ccdc))
        return -EBUSY;

    ccdc_lsc_setup_regs(ccdc, &req->config);
    ccdc_lsc_program_table(ccdc, req->table);
    return 0;
}

/*
 * ccdc_lsc_error_handler - Handle LSC prefetch error scenario.
 * @ccdc: Pointer to ISP CCDC device.
 *
 * Disables LSC, and defers enablement to shadow registers update time.
 */
static void ccdc_lsc_error_handler(struct isp_ccdc_device *ccdc)
{
    struct isp_device *isp = to_isp_device(ccdc);
    /*
     * From OMAP3 TRM: When this event is pending, the module
     * goes into transparent mode (output =input). Normal
     * operation can be resumed at the start of the next frame
     * after:
     *  1) Clearing this event
     *  2) Disabling the LSC module
     *  3) Enabling it
     */
    isp_reg_clr(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_LSC_CONFIG,
            ISPCCDC_LSC_ENABLE);
    ccdc->lsc.state = LSC_STATE_STOPPED;
}

static void ccdc_lsc_free_request(struct isp_ccdc_device *ccdc,
                  struct ispccdc_lsc_config_req *req)
{
    struct isp_device *isp = to_isp_device(ccdc);

    if (req == NULL)
        return;

    if (req->iovm)
        dma_unmap_sg(isp->dev, req->iovm->sgt->sgl,
                 req->iovm->sgt->nents, DMA_TO_DEVICE);
    if (req->table)
        omap_iommu_vfree(isp->domain, isp->dev, req->table);
    kfree(req);
}

static void ccdc_lsc_free_queue(struct isp_ccdc_device *ccdc,
                struct list_head *queue)
{
    struct ispccdc_lsc_config_req *req, *n;
    unsigned long flags;

    spin_lock_irqsave(&ccdc->lsc.req_lock, flags);
    list_for_each_entry_safe(req, n, queue, list) {
        list_del(&req->list);
        spin_unlock_irqrestore(&ccdc->lsc.req_lock, flags);
        ccdc_lsc_free_request(ccdc, req);
        spin_lock_irqsave(&ccdc->lsc.req_lock, flags);
    }
    spin_unlock_irqrestore(&ccdc->lsc.req_lock, flags);
}

static void ccdc_lsc_free_table_work(struct work_struct *work)
{
    struct isp_ccdc_device *ccdc;
    struct ispccdc_lsc *lsc;

    lsc = container_of(work, struct ispccdc_lsc, table_work);
    ccdc = container_of(lsc, struct isp_ccdc_device, lsc);

    ccdc_lsc_free_queue(ccdc, &lsc->free_queue);
}

/*
 * ccdc_lsc_config - Configure the LSC module from a userspace request
 *
 * Store the request LSC configuration in the LSC engine request pointer. The
 * configuration will be applied to the hardware when the CCDC will be enabled,
 * or at the next LSC interrupt if the CCDC is already running.
 */
static int ccdc_lsc_config(struct isp_ccdc_device *ccdc,
               struct omap3isp_ccdc_update_config *config)
{
    struct isp_device *isp = to_isp_device(ccdc);
    struct ispccdc_lsc_config_req *req;
    unsigned long flags;
    void *table;
    u16 update;
    int ret;

    update = config->update &
         (OMAP3ISP_CCDC_CONFIG_LSC | OMAP3ISP_CCDC_TBL_LSC);
    if (!update)
        return 0;

    if (update != (OMAP3ISP_CCDC_CONFIG_LSC | OMAP3ISP_CCDC_TBL_LSC)) {
        dev_dbg(to_device(ccdc), "%s: Both LSC configuration and table "
            "need to be supplied\n", __func__);
        return -EINVAL;
    }

    req = kzalloc(sizeof(*req), GFP_KERNEL);
    if (req == NULL)
        return -ENOMEM;

    if (config->flag & OMAP3ISP_CCDC_CONFIG_LSC) {
        if (copy_from_user(&req->config, config->lsc_cfg,
                   sizeof(req->config))) {
            ret = -EFAULT;
            goto done;
        }

        req->enable = 1;

        req->table = omap_iommu_vmalloc(isp->domain, isp->dev, 0,
                    req->config.size, IOMMU_FLAG);
        if (IS_ERR_VALUE(req->table)) {
            req->table = 0;
            ret = -ENOMEM;
            goto done;
        }

        req->iovm = omap_find_iovm_area(isp->dev, req->table);
        if (req->iovm == NULL) {
            ret = -ENOMEM;
            goto done;
        }

        if (!dma_map_sg(isp->dev, req->iovm->sgt->sgl,
                req->iovm->sgt->nents, DMA_TO_DEVICE)) {
            ret = -ENOMEM;
            req->iovm = NULL;
            goto done;
        }

        dma_sync_sg_for_cpu(isp->dev, req->iovm->sgt->sgl,
                    req->iovm->sgt->nents, DMA_TO_DEVICE);

        table = omap_da_to_va(isp->dev, req->table);
        if (copy_from_user(table, config->lsc, req->config.size)) {
            ret = -EFAULT;
            goto done;
        }

        dma_sync_sg_for_device(isp->dev, req->iovm->sgt->sgl,
                       req->iovm->sgt->nents, DMA_TO_DEVICE);
    }

    spin_lock_irqsave(&ccdc->lsc.req_lock, flags);
    if (ccdc->lsc.request) {
        list_add_tail(&ccdc->lsc.request->list, &ccdc->lsc.free_queue);
        schedule_work(&ccdc->lsc.table_work);
    }
    ccdc->lsc.request = req;
    spin_unlock_irqrestore(&ccdc->lsc.req_lock, flags);

    ret = 0;

done:
    if (ret < 0)
        ccdc_lsc_free_request(ccdc, req);

    return ret;
}

static inline int ccdc_lsc_is_configured(struct isp_ccdc_device *ccdc)
{
    unsigned long flags;

    spin_lock_irqsave(&ccdc->lsc.req_lock, flags);
    if (ccdc->lsc.active) {
        spin_unlock_irqrestore(&ccdc->lsc.req_lock, flags);
        return 1;
    }
    spin_unlock_irqrestore(&ccdc->lsc.req_lock, flags);
    return 0;
}

static int ccdc_lsc_enable(struct isp_ccdc_device *ccdc)
{
    struct ispccdc_lsc *lsc = &ccdc->lsc;

    if (lsc->state != LSC_STATE_STOPPED)
        return -EINVAL;

    if (lsc->active) {
        list_add_tail(&lsc->active->list, &lsc->free_queue);
        lsc->active = NULL;
    }

    if (__ccdc_lsc_configure(ccdc, lsc->request) < 0) {
        omap3isp_sbl_disable(to_isp_device(ccdc),
                OMAP3_ISP_SBL_CCDC_LSC_READ);
        list_add_tail(&lsc->request->list, &lsc->free_queue);
        lsc->request = NULL;
        goto done;
    }

    lsc->active = lsc->request;
    lsc->request = NULL;
    __ccdc_lsc_enable(ccdc, 1);

done:
    if (!list_empty(&lsc->free_queue))
        schedule_work(&lsc->table_work);

    return 0;
}

/* -----------------------------------------------------------------------------
 * Parameters configuration
 */

/*
 * ccdc_configure_clamp - Configure optical-black or digital clamping
 * @ccdc: Pointer to ISP CCDC device.
 *
 * The CCDC performs either optical-black or digital clamp. Configure and enable
 * the selected clamp method.
 */
static void ccdc_configure_clamp(struct isp_ccdc_device *ccdc)
{
    struct isp_device *isp = to_isp_device(ccdc);
    u32 clamp;

    if (ccdc->obclamp) {
        clamp  = ccdc->clamp.obgain << ISPCCDC_CLAMP_OBGAIN_SHIFT;
        clamp |= ccdc->clamp.oblen << ISPCCDC_CLAMP_OBSLEN_SHIFT;
        clamp |= ccdc->clamp.oblines << ISPCCDC_CLAMP_OBSLN_SHIFT;
        clamp |= ccdc->clamp.obstpixel << ISPCCDC_CLAMP_OBST_SHIFT;
        isp_reg_writel(isp, clamp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_CLAMP);
    } else {
        isp_reg_writel(isp, ccdc->clamp.dcsubval,
                   OMAP3_ISP_IOMEM_CCDC, ISPCCDC_DCSUB);
    }

    isp_reg_clr_set(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_CLAMP,
            ISPCCDC_CLAMP_CLAMPEN,
            ccdc->obclamp ? ISPCCDC_CLAMP_CLAMPEN : 0);
}

/*
 * ccdc_configure_fpc - Configure Faulty Pixel Correction
 * @ccdc: Pointer to ISP CCDC device.
 */
static void ccdc_configure_fpc(struct isp_ccdc_device *ccdc)
{
    struct isp_device *isp = to_isp_device(ccdc);

    isp_reg_clr(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_FPC, ISPCCDC_FPC_FPCEN);

    if (!ccdc->fpc_en)
        return;

    isp_reg_writel(isp, ccdc->fpc.fpcaddr, OMAP3_ISP_IOMEM_CCDC,
               ISPCCDC_FPC_ADDR);
    /* The FPNUM field must be set before enabling FPC. */
    isp_reg_writel(isp, (ccdc->fpc.fpnum << ISPCCDC_FPC_FPNUM_SHIFT),
               OMAP3_ISP_IOMEM_CCDC, ISPCCDC_FPC);
    isp_reg_writel(isp, (ccdc->fpc.fpnum << ISPCCDC_FPC_FPNUM_SHIFT) |
               ISPCCDC_FPC_FPCEN, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_FPC);
}

/*
 * ccdc_configure_black_comp - Configure Black Level Compensation.
 * @ccdc: Pointer to ISP CCDC device.
 */
static void ccdc_configure_black_comp(struct isp_ccdc_device *ccdc)
{
    struct isp_device *isp = to_isp_device(ccdc);
    u32 blcomp;

    blcomp  = ccdc->blcomp.b_mg << ISPCCDC_BLKCMP_B_MG_SHIFT;
    blcomp |= ccdc->blcomp.gb_g << ISPCCDC_BLKCMP_GB_G_SHIFT;
    blcomp |= ccdc->blcomp.gr_cy << ISPCCDC_BLKCMP_GR_CY_SHIFT;
    blcomp |= ccdc->blcomp.r_ye << ISPCCDC_BLKCMP_R_YE_SHIFT;

    isp_reg_writel(isp, blcomp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_BLKCMP);
}

/*
 * ccdc_configure_lpf - Configure Low-Pass Filter (LPF).
 * @ccdc: Pointer to ISP CCDC device.
 */
static void ccdc_configure_lpf(struct isp_ccdc_device *ccdc)
{
    struct isp_device *isp = to_isp_device(ccdc);

    isp_reg_clr_set(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_SYN_MODE,
            ISPCCDC_SYN_MODE_LPF,
            ccdc->lpf ? ISPCCDC_SYN_MODE_LPF : 0);
}

/*
 * ccdc_configure_alaw - Configure A-law compression.
 * @ccdc: Pointer to ISP CCDC device.
 */
static void ccdc_configure_alaw(struct isp_ccdc_device *ccdc)
{
    struct isp_device *isp = to_isp_device(ccdc);
    const struct isp_format_info *info;
    u32 alaw = 0;

    info = omap3isp_video_format_info(ccdc->formats[CCDC_PAD_SINK].code);

    switch (info->width) {
    case 8:
        return;

    case 10:
        alaw = ISPCCDC_ALAW_GWDI_9_0;
        break;
    case 11:
        alaw = ISPCCDC_ALAW_GWDI_10_1;
        break;
    case 12:
        alaw = ISPCCDC_ALAW_GWDI_11_2;
        break;
    case 13:
        alaw = ISPCCDC_ALAW_GWDI_12_3;
        break;
    }

    if (ccdc->alaw)
        alaw |= ISPCCDC_ALAW_CCDTBL;

    isp_reg_writel(isp, alaw, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_ALAW);
}

/*
 * ccdc_config_imgattr - Configure sensor image specific attributes.
 * @ccdc: Pointer to ISP CCDC device.
 * @colptn: Color pattern of the sensor.
 */
static void ccdc_config_imgattr(struct isp_ccdc_device *ccdc, u32 colptn)
{
    struct isp_device *isp = to_isp_device(ccdc);

    isp_reg_writel(isp, colptn, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_COLPTN);
}

/*
 * ccdc_config - Set CCDC configuration from userspace
 * @ccdc: Pointer to ISP CCDC device.
 * @userspace_add: Structure containing CCDC configuration sent from userspace.
 *
 * Returns 0 if successful, -EINVAL if the pointer to the configuration
 * structure is null, or the copy_from_user function fails to copy user space
 * memory to kernel space memory.
 */
static int ccdc_config(struct isp_ccdc_device *ccdc,
               struct omap3isp_ccdc_update_config *ccdc_struct)
{
    struct isp_device *isp = to_isp_device(ccdc);
    unsigned long flags;

    spin_lock_irqsave(&ccdc->lock, flags);
    ccdc->shadow_update = 1;
    spin_unlock_irqrestore(&ccdc->lock, flags);

    if (OMAP3ISP_CCDC_ALAW & ccdc_struct->update) {
        ccdc->alaw = !!(OMAP3ISP_CCDC_ALAW & ccdc_struct->flag);
        ccdc->update |= OMAP3ISP_CCDC_ALAW;
    }

    if (OMAP3ISP_CCDC_LPF & ccdc_struct->update) {
        ccdc->lpf = !!(OMAP3ISP_CCDC_LPF & ccdc_struct->flag);
        ccdc->update |= OMAP3ISP_CCDC_LPF;
    }

    if (OMAP3ISP_CCDC_BLCLAMP & ccdc_struct->update) {
        if (copy_from_user(&ccdc->clamp, ccdc_struct->bclamp,
                   sizeof(ccdc->clamp))) {
            ccdc->shadow_update = 0;
            return -EFAULT;
        }

        ccdc->obclamp = !!(OMAP3ISP_CCDC_BLCLAMP & ccdc_struct->flag);
        ccdc->update |= OMAP3ISP_CCDC_BLCLAMP;
    }

    if (OMAP3ISP_CCDC_BCOMP & ccdc_struct->update) {
        if (copy_from_user(&ccdc->blcomp, ccdc_struct->blcomp,
                   sizeof(ccdc->blcomp))) {
            ccdc->shadow_update = 0;
            return -EFAULT;
        }

        ccdc->update |= OMAP3ISP_CCDC_BCOMP;
    }

    ccdc->shadow_update = 0;

    if (OMAP3ISP_CCDC_FPC & ccdc_struct->update) {
        u32 table_old = 0;
        u32 table_new;
        u32 size;

        if (ccdc->state != ISP_PIPELINE_STREAM_STOPPED)
            return -EBUSY;

        ccdc->fpc_en = !!(OMAP3ISP_CCDC_FPC & ccdc_struct->flag);

        if (ccdc->fpc_en) {
            if (copy_from_user(&ccdc->fpc, ccdc_struct->fpc,
                       sizeof(ccdc->fpc)))
                return -EFAULT;

            /*
             * table_new must be 64-bytes aligned, but it's
             * already done by omap_iommu_vmalloc().
             */
            size = ccdc->fpc.fpnum * 4;
            table_new = omap_iommu_vmalloc(isp->domain, isp->dev,
                            0, size, IOMMU_FLAG);
            if (IS_ERR_VALUE(table_new))
                return -ENOMEM;

            if (copy_from_user(omap_da_to_va(isp->dev, table_new),
                       (__force void __user *)
                       ccdc->fpc.fpcaddr, size)) {
                omap_iommu_vfree(isp->domain, isp->dev,
                                table_new);
                return -EFAULT;
            }

            table_old = ccdc->fpc.fpcaddr;
            ccdc->fpc.fpcaddr = table_new;
        }

        ccdc_configure_fpc(ccdc);
        if (table_old != 0)
            omap_iommu_vfree(isp->domain, isp->dev, table_old);
    }

    return ccdc_lsc_config(ccdc, ccdc_struct);
}

static void ccdc_apply_controls(struct isp_ccdc_device *ccdc)
{
    if (ccdc->update & OMAP3ISP_CCDC_ALAW) {
        ccdc_configure_alaw(ccdc);
        ccdc->update &= ~OMAP3ISP_CCDC_ALAW;
    }

    if (ccdc->update & OMAP3ISP_CCDC_LPF) {
        ccdc_configure_lpf(ccdc);
        ccdc->update &= ~OMAP3ISP_CCDC_LPF;
    }

    if (ccdc->update & OMAP3ISP_CCDC_BLCLAMP) {
        ccdc_configure_clamp(ccdc);
        ccdc->update &= ~OMAP3ISP_CCDC_BLCLAMP;
    }

    if (ccdc->update & OMAP3ISP_CCDC_BCOMP) {
        ccdc_configure_black_comp(ccdc);
        ccdc->update &= ~OMAP3ISP_CCDC_BCOMP;
    }
}

/*
 * omap3isp_ccdc_restore_context - Restore values of the CCDC module registers
 * @dev: Pointer to ISP device
 */
void omap3isp_ccdc_restore_context(struct isp_device *isp)
{
    struct isp_ccdc_device *ccdc = &isp->isp_ccdc;

    isp_reg_set(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_CFG, ISPCCDC_CFG_VDLC);

    ccdc->update = OMAP3ISP_CCDC_ALAW | OMAP3ISP_CCDC_LPF
             | OMAP3ISP_CCDC_BLCLAMP | OMAP3ISP_CCDC_BCOMP;
    ccdc_apply_controls(ccdc);
    ccdc_configure_fpc(ccdc);
}

/* -----------------------------------------------------------------------------
 * Format- and pipeline-related configuration helpers
 */

/*
 * ccdc_config_vp - Configure the Video Port.
 * @ccdc: Pointer to ISP CCDC device.
 */
static void ccdc_config_vp(struct isp_ccdc_device *ccdc)
{
    struct isp_pipeline *pipe = to_isp_pipeline(&ccdc->subdev.entity);
    struct isp_device *isp = to_isp_device(ccdc);
    const struct isp_format_info *info;
    unsigned long l3_ick = pipe->l3_ick;
    unsigned int max_div = isp->revision == ISP_REVISION_15_0 ? 64 : 8;
    unsigned int div = 0;
    u32 fmtcfg_vp;

    fmtcfg_vp = isp_reg_readl(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_FMTCFG)
          & ~(ISPCCDC_FMTCFG_VPIN_MASK | ISPCCDC_FMTCFG_VPIF_FRQ_MASK);

    info = omap3isp_video_format_info(ccdc->formats[CCDC_PAD_SINK].code);

    switch (info->width) {
    case 8:
    case 10:
        fmtcfg_vp |= ISPCCDC_FMTCFG_VPIN_9_0;
        break;
    case 11:
        fmtcfg_vp |= ISPCCDC_FMTCFG_VPIN_10_1;
        break;
    case 12:
        fmtcfg_vp |= ISPCCDC_FMTCFG_VPIN_11_2;
        break;
    case 13:
        fmtcfg_vp |= ISPCCDC_FMTCFG_VPIN_12_3;
        break;
    }

    if (pipe->input)
        div = DIV_ROUND_UP(l3_ick, pipe->max_rate);
    else if (pipe->external_rate)
        div = l3_ick / pipe->external_rate;

    div = clamp(div, 2U, max_div);
    fmtcfg_vp |= (div - 2) << ISPCCDC_FMTCFG_VPIF_FRQ_SHIFT;

    isp_reg_writel(isp, fmtcfg_vp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_FMTCFG);
}

/*
 * ccdc_enable_vp - Enable Video Port.
 * @ccdc: Pointer to ISP CCDC device.
 * @enable: 0 Disables VP, 1 Enables VP
 *
 * This is needed for outputting image to Preview, H3A and HIST ISP submodules.
 */
static void ccdc_enable_vp(struct isp_ccdc_device *ccdc, u8 enable)
{
    struct isp_device *isp = to_isp_device(ccdc);

    isp_reg_clr_set(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_FMTCFG,
            ISPCCDC_FMTCFG_VPEN, enable ? ISPCCDC_FMTCFG_VPEN : 0);
}

/*
 * ccdc_config_outlineoffset - Configure memory saving output line offset
 * @ccdc: Pointer to ISP CCDC device.
 * @offset: Address offset to start a new line. Must be twice the
 *          Output width and aligned on 32 byte boundary
 * @oddeven: Specifies the odd/even line pattern to be chosen to store the
 *           output.
 * @numlines: Set the value 0-3 for +1-4lines, 4-7 for -1-4lines.
 *
 * - Configures the output line offset when stored in memory
 * - Sets the odd/even line pattern to store the output
 *    (EVENEVEN (1), ODDEVEN (2), EVENODD (3), ODDODD (4))
 * - Configures the number of even and odd line fields in case of rearranging
 * the lines.
 */
static void ccdc_config_outlineoffset(struct isp_ccdc_device *ccdc,
                    u32 offset, u8 oddeven, u8 numlines)
{
    struct isp_device *isp = to_isp_device(ccdc);

    isp_reg_writel(isp, offset & 0xffff,
               OMAP3_ISP_IOMEM_CCDC, ISPCCDC_HSIZE_OFF);

    isp_reg_clr(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_SDOFST,
            ISPCCDC_SDOFST_FINV);

    isp_reg_clr(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_SDOFST,
            ISPCCDC_SDOFST_FOFST_4L);

    switch (oddeven) {
    case EVENEVEN:
        isp_reg_set(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_SDOFST,
                (numlines & 0x7) << ISPCCDC_SDOFST_LOFST0_SHIFT);
        break;
    case ODDEVEN:
        isp_reg_set(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_SDOFST,
                (numlines & 0x7) << ISPCCDC_SDOFST_LOFST1_SHIFT);
        break;
    case EVENODD:
        isp_reg_set(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_SDOFST,
                (numlines & 0x7) << ISPCCDC_SDOFST_LOFST2_SHIFT);
        break;
    case ODDODD:
        isp_reg_set(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_SDOFST,
                (numlines & 0x7) << ISPCCDC_SDOFST_LOFST3_SHIFT);
        break;
    default:
        break;
    }
}

/*
 * ccdc_set_outaddr - Set memory address to save output image
 * @ccdc: Pointer to ISP CCDC device.
 * @addr: ISP MMU Mapped 32-bit memory address aligned on 32 byte boundary.
 *
 * Sets the memory address where the output will be saved.
 */
static void ccdc_set_outaddr(struct isp_ccdc_device *ccdc, u32 addr)
{
    struct isp_device *isp = to_isp_device(ccdc);

    isp_reg_writel(isp, addr, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_SDR_ADDR);
}

/*
 * omap3isp_ccdc_max_rate - Calculate maximum input data rate based on the input
 * @ccdc: Pointer to ISP CCDC device.
 * @max_rate: Maximum calculated data rate.
 *
 * Returns in *max_rate less value between calculated and passed
 */
void omap3isp_ccdc_max_rate(struct isp_ccdc_device *ccdc,
                unsigned int *max_rate)
{
    struct isp_pipeline *pipe = to_isp_pipeline(&ccdc->subdev.entity);
    unsigned int rate;

    if (pipe == NULL)
        return;

    /*
     * TRM says that for parallel sensors the maximum data rate
     * should be 90% form L3/2 clock, otherwise just L3/2.
     */
    if (ccdc->input == CCDC_INPUT_PARALLEL)
        rate = pipe->l3_ick / 2 * 9 / 10;
    else
        rate = pipe->l3_ick / 2;

    *max_rate = min(*max_rate, rate);
}

/*
 * ccdc_config_sync_if - Set CCDC sync interface configuration
 * @ccdc: Pointer to ISP CCDC device.
 * @pdata: Parallel interface platform data (may be NULL)
 * @data_size: Data size
 */
static void ccdc_config_sync_if(struct isp_ccdc_device *ccdc,
                struct isp_parallel_platform_data *pdata,
                unsigned int data_size)
{
    struct isp_device *isp = to_isp_device(ccdc);
    const struct v4l2_mbus_framefmt *format;
    u32 syn_mode = ISPCCDC_SYN_MODE_VDHDEN;

    format = &ccdc->formats[CCDC_PAD_SINK];

    if (format->code == V4L2_MBUS_FMT_YUYV8_2X8 ||
        format->code == V4L2_MBUS_FMT_UYVY8_2X8) {
        /* The bridge is enabled for YUV8 formats. Configure the input
         * mode accordingly.
         */
        syn_mode |= ISPCCDC_SYN_MODE_INPMOD_YCBCR16;
    }

    switch (data_size) {
    case 8:
        syn_mode |= ISPCCDC_SYN_MODE_DATSIZ_8;
        break;
    case 10:
        syn_mode |= ISPCCDC_SYN_MODE_DATSIZ_10;
        break;
    case 11:
        syn_mode |= ISPCCDC_SYN_MODE_DATSIZ_11;
        break;
    case 12:
        syn_mode |= ISPCCDC_SYN_MODE_DATSIZ_12;
        break;
    }

    if (pdata && pdata->data_pol)
        syn_mode |= ISPCCDC_SYN_MODE_DATAPOL;

    if (pdata && pdata->hs_pol)
        syn_mode |= ISPCCDC_SYN_MODE_HDPOL;

    if (pdata && pdata->vs_pol)
        syn_mode |= ISPCCDC_SYN_MODE_VDPOL;

    isp_reg_writel(isp, syn_mode, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_SYN_MODE);

    /* The CCDC_CFG.Y8POS bit is used in YCbCr8 input mode only. The
     * hardware seems to ignore it in all other input modes.
     */
    if (format->code == V4L2_MBUS_FMT_UYVY8_2X8)
        isp_reg_set(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_CFG,
                ISPCCDC_CFG_Y8POS);
    else
        isp_reg_clr(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_CFG,
                ISPCCDC_CFG_Y8POS);

    isp_reg_clr(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_REC656IF,
            ISPCCDC_REC656IF_R656ON);
}

/* CCDC formats descriptions */
static const u32 ccdc_sgrbg_pattern =
    ISPCCDC_COLPTN_Gr_Cy << ISPCCDC_COLPTN_CP0PLC0_SHIFT |
    ISPCCDC_COLPTN_R_Ye  << ISPCCDC_COLPTN_CP0PLC1_SHIFT |
    ISPCCDC_COLPTN_Gr_Cy << ISPCCDC_COLPTN_CP0PLC2_SHIFT |
    ISPCCDC_COLPTN_R_Ye  << ISPCCDC_COLPTN_CP0PLC3_SHIFT |
    ISPCCDC_COLPTN_B_Mg  << ISPCCDC_COLPTN_CP1PLC0_SHIFT |
    ISPCCDC_COLPTN_Gb_G  << ISPCCDC_COLPTN_CP1PLC1_SHIFT |
    ISPCCDC_COLPTN_B_Mg  << ISPCCDC_COLPTN_CP1PLC2_SHIFT |
    ISPCCDC_COLPTN_Gb_G  << ISPCCDC_COLPTN_CP1PLC3_SHIFT |
    ISPCCDC_COLPTN_Gr_Cy << ISPCCDC_COLPTN_CP2PLC0_SHIFT |
    ISPCCDC_COLPTN_R_Ye  << ISPCCDC_COLPTN_CP2PLC1_SHIFT |
    ISPCCDC_COLPTN_Gr_Cy << ISPCCDC_COLPTN_CP2PLC2_SHIFT |
    ISPCCDC_COLPTN_R_Ye  << ISPCCDC_COLPTN_CP2PLC3_SHIFT |
    ISPCCDC_COLPTN_B_Mg  << ISPCCDC_COLPTN_CP3PLC0_SHIFT |
    ISPCCDC_COLPTN_Gb_G  << ISPCCDC_COLPTN_CP3PLC1_SHIFT |
    ISPCCDC_COLPTN_B_Mg  << ISPCCDC_COLPTN_CP3PLC2_SHIFT |
    ISPCCDC_COLPTN_Gb_G  << ISPCCDC_COLPTN_CP3PLC3_SHIFT;

static const u32 ccdc_srggb_pattern =
    ISPCCDC_COLPTN_R_Ye  << ISPCCDC_COLPTN_CP0PLC0_SHIFT |
    ISPCCDC_COLPTN_Gr_Cy << ISPCCDC_COLPTN_CP0PLC1_SHIFT |
    ISPCCDC_COLPTN_R_Ye  << ISPCCDC_COLPTN_CP0PLC2_SHIFT |
    ISPCCDC_COLPTN_Gr_Cy << ISPCCDC_COLPTN_CP0PLC3_SHIFT |
    ISPCCDC_COLPTN_Gb_G  << ISPCCDC_COLPTN_CP1PLC0_SHIFT |
    ISPCCDC_COLPTN_B_Mg  << ISPCCDC_COLPTN_CP1PLC1_SHIFT |
    ISPCCDC_COLPTN_Gb_G  << ISPCCDC_COLPTN_CP1PLC2_SHIFT |
    ISPCCDC_COLPTN_B_Mg  << ISPCCDC_COLPTN_CP1PLC3_SHIFT |
    ISPCCDC_COLPTN_R_Ye  << ISPCCDC_COLPTN_CP2PLC0_SHIFT |
    ISPCCDC_COLPTN_Gr_Cy << ISPCCDC_COLPTN_CP2PLC1_SHIFT |
    ISPCCDC_COLPTN_R_Ye  << ISPCCDC_COLPTN_CP2PLC2_SHIFT |
    ISPCCDC_COLPTN_Gr_Cy << ISPCCDC_COLPTN_CP2PLC3_SHIFT |
    ISPCCDC_COLPTN_Gb_G  << ISPCCDC_COLPTN_CP3PLC0_SHIFT |
    ISPCCDC_COLPTN_B_Mg  << ISPCCDC_COLPTN_CP3PLC1_SHIFT |
    ISPCCDC_COLPTN_Gb_G  << ISPCCDC_COLPTN_CP3PLC2_SHIFT |
    ISPCCDC_COLPTN_B_Mg  << ISPCCDC_COLPTN_CP3PLC3_SHIFT;

static const u32 ccdc_sbggr_pattern =
    ISPCCDC_COLPTN_B_Mg  << ISPCCDC_COLPTN_CP0PLC0_SHIFT |
    ISPCCDC_COLPTN_Gb_G  << ISPCCDC_COLPTN_CP0PLC1_SHIFT |
    ISPCCDC_COLPTN_B_Mg  << ISPCCDC_COLPTN_CP0PLC2_SHIFT |
    ISPCCDC_COLPTN_Gb_G  << ISPCCDC_COLPTN_CP0PLC3_SHIFT |
    ISPCCDC_COLPTN_Gr_Cy << ISPCCDC_COLPTN_CP1PLC0_SHIFT |
    ISPCCDC_COLPTN_R_Ye  << ISPCCDC_COLPTN_CP1PLC1_SHIFT |
    ISPCCDC_COLPTN_Gr_Cy << ISPCCDC_COLPTN_CP1PLC2_SHIFT |
    ISPCCDC_COLPTN_R_Ye  << ISPCCDC_COLPTN_CP1PLC3_SHIFT |
    ISPCCDC_COLPTN_B_Mg  << ISPCCDC_COLPTN_CP2PLC0_SHIFT |
    ISPCCDC_COLPTN_Gb_G  << ISPCCDC_COLPTN_CP2PLC1_SHIFT |
    ISPCCDC_COLPTN_B_Mg  << ISPCCDC_COLPTN_CP2PLC2_SHIFT |
    ISPCCDC_COLPTN_Gb_G  << ISPCCDC_COLPTN_CP2PLC3_SHIFT |
    ISPCCDC_COLPTN_Gr_Cy << ISPCCDC_COLPTN_CP3PLC0_SHIFT |
    ISPCCDC_COLPTN_R_Ye  << ISPCCDC_COLPTN_CP3PLC1_SHIFT |
    ISPCCDC_COLPTN_Gr_Cy << ISPCCDC_COLPTN_CP3PLC2_SHIFT |
    ISPCCDC_COLPTN_R_Ye  << ISPCCDC_COLPTN_CP3PLC3_SHIFT;

static const u32 ccdc_sgbrg_pattern =
    ISPCCDC_COLPTN_Gb_G  << ISPCCDC_COLPTN_CP0PLC0_SHIFT |
    ISPCCDC_COLPTN_B_Mg  << ISPCCDC_COLPTN_CP0PLC1_SHIFT |
    ISPCCDC_COLPTN_Gb_G  << ISPCCDC_COLPTN_CP0PLC2_SHIFT |
    ISPCCDC_COLPTN_B_Mg  << ISPCCDC_COLPTN_CP0PLC3_SHIFT |
    ISPCCDC_COLPTN_R_Ye  << ISPCCDC_COLPTN_CP1PLC0_SHIFT |
    ISPCCDC_COLPTN_Gr_Cy << ISPCCDC_COLPTN_CP1PLC1_SHIFT |
    ISPCCDC_COLPTN_R_Ye  << ISPCCDC_COLPTN_CP1PLC2_SHIFT |
    ISPCCDC_COLPTN_Gr_Cy << ISPCCDC_COLPTN_CP1PLC3_SHIFT |
    ISPCCDC_COLPTN_Gb_G  << ISPCCDC_COLPTN_CP2PLC0_SHIFT |
    ISPCCDC_COLPTN_B_Mg  << ISPCCDC_COLPTN_CP2PLC1_SHIFT |
    ISPCCDC_COLPTN_Gb_G  << ISPCCDC_COLPTN_CP2PLC2_SHIFT |
    ISPCCDC_COLPTN_B_Mg  << ISPCCDC_COLPTN_CP2PLC3_SHIFT |
    ISPCCDC_COLPTN_R_Ye  << ISPCCDC_COLPTN_CP3PLC0_SHIFT |
    ISPCCDC_COLPTN_Gr_Cy << ISPCCDC_COLPTN_CP3PLC1_SHIFT |
    ISPCCDC_COLPTN_R_Ye  << ISPCCDC_COLPTN_CP3PLC2_SHIFT |
    ISPCCDC_COLPTN_Gr_Cy << ISPCCDC_COLPTN_CP3PLC3_SHIFT;

static void ccdc_configure(struct isp_ccdc_device *ccdc)
{
    struct isp_device *isp = to_isp_device(ccdc);
    struct isp_parallel_platform_data *pdata = NULL;
    struct v4l2_subdev *sensor;
    struct v4l2_mbus_framefmt *format;
    const struct v4l2_rect *crop;
    const struct isp_format_info *fmt_info;
    struct v4l2_subdev_format fmt_src;
    unsigned int depth_out;
    unsigned int depth_in = 0;
    struct media_pad *pad;
    unsigned long flags;
    unsigned int bridge;
    unsigned int shift;
    u32 syn_mode;
    u32 ccdc_pattern;

    pad = media_entity_remote_source(&ccdc->pads[CCDC_PAD_SINK]);
    sensor = media_entity_to_v4l2_subdev(pad->entity);
    if (ccdc->input == CCDC_INPUT_PARALLEL)
        pdata = &((struct isp_v4l2_subdevs_group *)sensor->host_priv)
            ->bus.parallel;

    /* Compute the lane shifter shift value and enable the bridge when the
     * input format is YUV.
     */
    fmt_src.pad = pad->index;
    fmt_src.which = V4L2_SUBDEV_FORMAT_ACTIVE;
    if (!v4l2_subdev_call(sensor, pad, get_fmt, NULL, &fmt_src)) {
        fmt_info = omap3isp_video_format_info(fmt_src.format.code);
        depth_in = fmt_info->width;
    }

    fmt_info = omap3isp_video_format_info
        (isp->isp_ccdc.formats[CCDC_PAD_SINK].code);
    depth_out = fmt_info->width;
    shift = depth_in - depth_out;

    if (fmt_info->code == V4L2_MBUS_FMT_YUYV8_2X8)
        bridge = ISPCTRL_PAR_BRIDGE_LENDIAN;
    else if (fmt_info->code == V4L2_MBUS_FMT_UYVY8_2X8)
        bridge = ISPCTRL_PAR_BRIDGE_BENDIAN;
    else
        bridge = ISPCTRL_PAR_BRIDGE_DISABLE;

    omap3isp_configure_bridge(isp, ccdc->input, pdata, shift, bridge);

    ccdc_config_sync_if(ccdc, pdata, depth_out);

    syn_mode = isp_reg_readl(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_SYN_MODE);

    /* Use the raw, unprocessed data when writing to memory. The H3A and
     * histogram modules are still fed with lens shading corrected data.
     */
    syn_mode &= ~ISPCCDC_SYN_MODE_VP2SDR;

    if (ccdc->output & CCDC_OUTPUT_MEMORY)
        syn_mode |= ISPCCDC_SYN_MODE_WEN;
    else
        syn_mode &= ~ISPCCDC_SYN_MODE_WEN;

    if (ccdc->output & CCDC_OUTPUT_RESIZER)
        syn_mode |= ISPCCDC_SYN_MODE_SDR2RSZ;
    else
        syn_mode &= ~ISPCCDC_SYN_MODE_SDR2RSZ;

    /* CCDC_PAD_SINK */
    format = &ccdc->formats[CCDC_PAD_SINK];

    /* Mosaic filter */
    switch (format->code) {
    case V4L2_MBUS_FMT_SRGGB10_1X10:
    case V4L2_MBUS_FMT_SRGGB12_1X12:
        ccdc_pattern = ccdc_srggb_pattern;
        break;
    case V4L2_MBUS_FMT_SBGGR10_1X10:
    case V4L2_MBUS_FMT_SBGGR12_1X12:
        ccdc_pattern = ccdc_sbggr_pattern;
        break;
    case V4L2_MBUS_FMT_SGBRG10_1X10:
    case V4L2_MBUS_FMT_SGBRG12_1X12:
        ccdc_pattern = ccdc_sgbrg_pattern;
        break;
    default:
        /* Use GRBG */
        ccdc_pattern = ccdc_sgrbg_pattern;
        break;
    }
    ccdc_config_imgattr(ccdc, ccdc_pattern);

    /* Generate VD0 on the last line of the image and VD1 on the
     * 2/3 height line.
     */
    isp_reg_writel(isp, ((format->height - 2) << ISPCCDC_VDINT_0_SHIFT) |
               ((format->height * 2 / 3) << ISPCCDC_VDINT_1_SHIFT),
               OMAP3_ISP_IOMEM_CCDC, ISPCCDC_VDINT);

    /* CCDC_PAD_SOURCE_OF */
    format = &ccdc->formats[CCDC_PAD_SOURCE_OF];
    crop = &ccdc->crop;

    isp_reg_writel(isp, (crop->left << ISPCCDC_HORZ_INFO_SPH_SHIFT) |
               ((crop->width - 1) << ISPCCDC_HORZ_INFO_NPH_SHIFT),
               OMAP3_ISP_IOMEM_CCDC, ISPCCDC_HORZ_INFO);
    isp_reg_writel(isp, crop->top << ISPCCDC_VERT_START_SLV0_SHIFT,
               OMAP3_ISP_IOMEM_CCDC, ISPCCDC_VERT_START);
    isp_reg_writel(isp, (crop->height - 1)
            << ISPCCDC_VERT_LINES_NLV_SHIFT,
               OMAP3_ISP_IOMEM_CCDC, ISPCCDC_VERT_LINES);

    ccdc_config_outlineoffset(ccdc, ccdc->video_out.bpl_value, 0, 0);

    /* The CCDC outputs data in UYVY order by default. Swap bytes to get
     * YUYV.
     */
    if (format->code == V4L2_MBUS_FMT_YUYV8_1X16)
        isp_reg_set(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_CFG,
                ISPCCDC_CFG_BSWD);
    else
        isp_reg_clr(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_CFG,
                ISPCCDC_CFG_BSWD);

    /* Use PACK8 mode for 1byte per pixel formats. */
    if (omap3isp_video_format_info(format->code)->width <= 8)
        syn_mode |= ISPCCDC_SYN_MODE_PACK8;
    else
        syn_mode &= ~ISPCCDC_SYN_MODE_PACK8;

    isp_reg_writel(isp, syn_mode, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_SYN_MODE);

    /* CCDC_PAD_SOURCE_VP */
    format = &ccdc->formats[CCDC_PAD_SOURCE_VP];

    isp_reg_writel(isp, (0 << ISPCCDC_FMT_HORZ_FMTSPH_SHIFT) |
               (format->width << ISPCCDC_FMT_HORZ_FMTLNH_SHIFT),
               OMAP3_ISP_IOMEM_CCDC, ISPCCDC_FMT_HORZ);
    isp_reg_writel(isp, (0 << ISPCCDC_FMT_VERT_FMTSLV_SHIFT) |
               ((format->height + 1) << ISPCCDC_FMT_VERT_FMTLNV_SHIFT),
               OMAP3_ISP_IOMEM_CCDC, ISPCCDC_FMT_VERT);

    isp_reg_writel(isp, (format->width << ISPCCDC_VP_OUT_HORZ_NUM_SHIFT) |
               (format->height << ISPCCDC_VP_OUT_VERT_NUM_SHIFT),
               OMAP3_ISP_IOMEM_CCDC, ISPCCDC_VP_OUT);

    /* Lens shading correction. */
    spin_lock_irqsave(&ccdc->lsc.req_lock, flags);
    if (ccdc->lsc.request == NULL)
        goto unlock;

    WARN_ON(ccdc->lsc.active);

    /* Get last good LSC configuration. If it is not supported for
     * the current active resolution discard it.
     */
    if (ccdc->lsc.active == NULL &&
        __ccdc_lsc_configure(ccdc, ccdc->lsc.request) == 0) {
        ccdc->lsc.active = ccdc->lsc.request;
    } else {
        list_add_tail(&ccdc->lsc.request->list, &ccdc->lsc.free_queue);
        schedule_work(&ccdc->lsc.table_work);
    }

    ccdc->lsc.request = NULL;

unlock:
    spin_unlock_irqrestore(&ccdc->lsc.req_lock, flags);

    ccdc_apply_controls(ccdc);
}

static void __ccdc_enable(struct isp_ccdc_device *ccdc, int enable)
{
    struct isp_device *isp = to_isp_device(ccdc);

    isp_reg_clr_set(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_PCR,
            ISPCCDC_PCR_EN, enable ? ISPCCDC_PCR_EN : 0);
}

static int ccdc_disable(struct isp_ccdc_device *ccdc)
{
    unsigned long flags;
    int ret = 0;

    spin_lock_irqsave(&ccdc->lock, flags);
    if (ccdc->state == ISP_PIPELINE_STREAM_CONTINUOUS)
        ccdc->stopping = CCDC_STOP_REQUEST;
    spin_unlock_irqrestore(&ccdc->lock, flags);

    ret = wait_event_timeout(ccdc->wait,
                 ccdc->stopping == CCDC_STOP_FINISHED,
                 msecs_to_jiffies(2000));
    if (ret == 0) {
        ret = -ETIMEDOUT;
        dev_warn(to_device(ccdc), "CCDC stop timeout!\n");
    }

    omap3isp_sbl_disable(to_isp_device(ccdc), OMAP3_ISP_SBL_CCDC_LSC_READ);

    mutex_lock(&ccdc->ioctl_lock);
    ccdc_lsc_free_request(ccdc, ccdc->lsc.request);
    ccdc->lsc.request = ccdc->lsc.active;
    ccdc->lsc.active = NULL;
    cancel_work_sync(&ccdc->lsc.table_work);
    ccdc_lsc_free_queue(ccdc, &ccdc->lsc.free_queue);
    mutex_unlock(&ccdc->ioctl_lock);

    ccdc->stopping = CCDC_STOP_NOT_REQUESTED;

    return ret > 0 ? 0 : ret;
}

static void ccdc_enable(struct isp_ccdc_device *ccdc)
{
    if (ccdc_lsc_is_configured(ccdc))
        __ccdc_lsc_enable(ccdc, 1);
    __ccdc_enable(ccdc, 1);
}

/* -----------------------------------------------------------------------------
 * Interrupt handling
 */

/*
 * ccdc_sbl_busy - Poll idle state of CCDC and related SBL memory write bits
 * @ccdc: Pointer to ISP CCDC device.
 *
 * Returns zero if the CCDC is idle and the image has been written to
 * memory, too.
 */
static int ccdc_sbl_busy(struct isp_ccdc_device *ccdc)
{
    struct isp_device *isp = to_isp_device(ccdc);

    return omap3isp_ccdc_busy(ccdc)
        | (isp_reg_readl(isp, OMAP3_ISP_IOMEM_SBL, ISPSBL_CCDC_WR_0) &
           ISPSBL_CCDC_WR_0_DATA_READY)
        | (isp_reg_readl(isp, OMAP3_ISP_IOMEM_SBL, ISPSBL_CCDC_WR_1) &
           ISPSBL_CCDC_WR_0_DATA_READY)
        | (isp_reg_readl(isp, OMAP3_ISP_IOMEM_SBL, ISPSBL_CCDC_WR_2) &
           ISPSBL_CCDC_WR_0_DATA_READY)
        | (isp_reg_readl(isp, OMAP3_ISP_IOMEM_SBL, ISPSBL_CCDC_WR_3) &
           ISPSBL_CCDC_WR_0_DATA_READY);
}

/*
 * ccdc_sbl_wait_idle - Wait until the CCDC and related SBL are idle
 * @ccdc: Pointer to ISP CCDC device.
 * @max_wait: Max retry count in us for wait for idle/busy transition.
 */
static int ccdc_sbl_wait_idle(struct isp_ccdc_device *ccdc,
                  unsigned int max_wait)
{
    unsigned int wait = 0;

    if (max_wait == 0)
        max_wait = 10000; /* 10 ms */

    for (wait = 0; wait <= max_wait; wait++) {
        if (!ccdc_sbl_busy(ccdc))
            return 0;

        rmb();
        udelay(1);
    }

    return -EBUSY;
}

/* __ccdc_handle_stopping - Handle CCDC and/or LSC stopping sequence
 * @ccdc: Pointer to ISP CCDC device.
 * @event: Pointing which event trigger handler
 *
 * Return 1 when the event and stopping request combination is satisfied,
 * zero otherwise.
 */
static int __ccdc_handle_stopping(struct isp_ccdc_device *ccdc, u32 event)
{
    int rval = 0;

    switch ((ccdc->stopping & 3) | event) {
    case CCDC_STOP_REQUEST | CCDC_EVENT_VD1:
        if (ccdc->lsc.state != LSC_STATE_STOPPED)
            __ccdc_lsc_enable(ccdc, 0);
        __ccdc_enable(ccdc, 0);
        ccdc->stopping = CCDC_STOP_EXECUTED;
        return 1;

    case CCDC_STOP_EXECUTED | CCDC_EVENT_VD0:
        ccdc->stopping |= CCDC_STOP_CCDC_FINISHED;
        if (ccdc->lsc.state == LSC_STATE_STOPPED)
            ccdc->stopping |= CCDC_STOP_LSC_FINISHED;
        rval = 1;
        break;

    case CCDC_STOP_EXECUTED | CCDC_EVENT_LSC_DONE:
        ccdc->stopping |= CCDC_STOP_LSC_FINISHED;
        rval = 1;
        break;

    case CCDC_STOP_EXECUTED | CCDC_EVENT_VD1:
        return 1;
    }

    if (ccdc->stopping == CCDC_STOP_FINISHED) {
        wake_up(&ccdc->wait);
        rval = 1;
    }

    return rval;
}

static void ccdc_hs_vs_isr(struct isp_ccdc_device *ccdc)
{
    struct isp_pipeline *pipe = to_isp_pipeline(&ccdc->subdev.entity);
    struct video_device *vdev = ccdc->subdev.devnode;
    struct v4l2_event event;

    /* Frame number propagation */
    atomic_inc(&pipe->frame_number);

    memset(&event, 0, sizeof(event));
    event.type = V4L2_EVENT_FRAME_SYNC;
    event.u.frame_sync.frame_sequence = atomic_read(&pipe->frame_number);

    v4l2_event_queue(vdev, &event);
}

/*
 * ccdc_lsc_isr - Handle LSC events
 * @ccdc: Pointer to ISP CCDC device.
 * @events: LSC events
 */
static void ccdc_lsc_isr(struct isp_ccdc_device *ccdc, u32 events)
{
    unsigned long flags;

    if (events & IRQ0STATUS_CCDC_LSC_PREF_ERR_IRQ) {
        struct isp_pipeline *pipe =
            to_isp_pipeline(&ccdc->subdev.entity);

        ccdc_lsc_error_handler(ccdc);
        pipe->error = true;
        dev_dbg(to_device(ccdc), "lsc prefetch error\n");
    }

    if (!(events & IRQ0STATUS_CCDC_LSC_DONE_IRQ))
        return;

    /* LSC_DONE interrupt occur, there are two cases
     * 1. stopping for reconfiguration
     * 2. stopping because of STREAM OFF command
     */
    spin_lock_irqsave(&ccdc->lsc.req_lock, flags);

    if (ccdc->lsc.state == LSC_STATE_STOPPING)
        ccdc->lsc.state = LSC_STATE_STOPPED;

    if (__ccdc_handle_stopping(ccdc, CCDC_EVENT_LSC_DONE))
        goto done;

    if (ccdc->lsc.state != LSC_STATE_RECONFIG)
        goto done;

    /* LSC is in STOPPING state, change to the new state */
    ccdc->lsc.state = LSC_STATE_STOPPED;

    /* This is an exception. Start of frame and LSC_DONE interrupt
     * have been received on the same time. Skip this event and wait
     * for better times.
     */
    if (events & IRQ0STATUS_HS_VS_IRQ)
        goto done;

    /* The LSC engine is stopped at this point. Enable it if there's a
     * pending request.
     */
    if (ccdc->lsc.request == NULL)
        goto done;

    ccdc_lsc_enable(ccdc);

done:
    spin_unlock_irqrestore(&ccdc->lsc.req_lock, flags);
}

static int ccdc_isr_buffer(struct isp_ccdc_device *ccdc)
{
    struct isp_pipeline *pipe = to_isp_pipeline(&ccdc->subdev.entity);
    struct isp_device *isp = to_isp_device(ccdc);
    struct isp_buffer *buffer;
    int restart = 0;

    /* The CCDC generates VD0 interrupts even when disabled (the datasheet
     * doesn't explicitly state if that's supposed to happen or not, so it
     * can be considered as a hardware bug or as a feature, but we have to
     * deal with it anyway). Disabling the CCDC when no buffer is available
     * would thus not be enough, we need to handle the situation explicitly.
     */
    if (list_empty(&ccdc->video_out.dmaqueue))
        goto done;

    /* We're in continuous mode, and memory writes were disabled due to a
     * buffer underrun. Reenable them now that we have a buffer. The buffer
     * address has been set in ccdc_video_queue.
     */
    if (ccdc->state == ISP_PIPELINE_STREAM_CONTINUOUS && ccdc->underrun) {
        restart = 1;
        ccdc->underrun = 0;
        goto done;
    }

    if (ccdc_sbl_wait_idle(ccdc, 1000)) {
        dev_info(isp->dev, "CCDC won't become idle!\n");
        goto done;
    }

    buffer = omap3isp_video_buffer_next(&ccdc->video_out);
    if (buffer != NULL) {
        ccdc_set_outaddr(ccdc, buffer->isp_addr);
        restart = 1;
    }

    pipe->state |= ISP_PIPELINE_IDLE_OUTPUT;

    if (ccdc->state == ISP_PIPELINE_STREAM_SINGLESHOT &&
        isp_pipeline_ready(pipe))
        omap3isp_pipeline_set_stream(pipe,
                    ISP_PIPELINE_STREAM_SINGLESHOT);

done:
    return restart;
}

/*
 * ccdc_vd0_isr - Handle VD0 event
 * @ccdc: Pointer to ISP CCDC device.
 *
 * Executes LSC deferred enablement before next frame starts.
 */
static void ccdc_vd0_isr(struct isp_ccdc_device *ccdc)
{
    unsigned long flags;
    int restart = 0;

    if (ccdc->output & CCDC_OUTPUT_MEMORY)
        restart = ccdc_isr_buffer(ccdc);

    spin_lock_irqsave(&ccdc->lock, flags);
    if (__ccdc_handle_stopping(ccdc, CCDC_EVENT_VD0)) {
        spin_unlock_irqrestore(&ccdc->lock, flags);
        return;
    }

    if (!ccdc->shadow_update)
        ccdc_apply_controls(ccdc);
    spin_unlock_irqrestore(&ccdc->lock, flags);

    if (restart)
        ccdc_enable(ccdc);
}

/*
 * ccdc_vd1_isr - Handle VD1 event
 * @ccdc: Pointer to ISP CCDC device.
 */
static void ccdc_vd1_isr(struct isp_ccdc_device *ccdc)
{
    unsigned long flags;

    spin_lock_irqsave(&ccdc->lsc.req_lock, flags);

    /*
     * Depending on the CCDC pipeline state, CCDC stopping should be
     * handled differently. In SINGLESHOT we emulate an internal CCDC
     * stopping because the CCDC hw works only in continuous mode.
     * When CONTINUOUS pipeline state is used and the CCDC writes it's
     * data to memory the CCDC and LSC are stopped immediately but
     * without change the CCDC stopping state machine. The CCDC
     * stopping state machine should be used only when user request
     * for stopping is received (SINGLESHOT is an exeption).
     */
    switch (ccdc->state) {
    case ISP_PIPELINE_STREAM_SINGLESHOT:
        ccdc->stopping = CCDC_STOP_REQUEST;
        break;

    case ISP_PIPELINE_STREAM_CONTINUOUS:
        if (ccdc->output & CCDC_OUTPUT_MEMORY) {
            if (ccdc->lsc.state != LSC_STATE_STOPPED)
                __ccdc_lsc_enable(ccdc, 0);
            __ccdc_enable(ccdc, 0);
        }
        break;

    case ISP_PIPELINE_STREAM_STOPPED:
        break;
    }

    if (__ccdc_handle_stopping(ccdc, CCDC_EVENT_VD1))
        goto done;

    if (ccdc->lsc.request == NULL)
        goto done;

    /*
     * LSC need to be reconfigured. Stop it here and on next LSC_DONE IRQ
     * do the appropriate changes in registers
     */
    if (ccdc->lsc.state == LSC_STATE_RUNNING) {
        __ccdc_lsc_enable(ccdc, 0);
        ccdc->lsc.state = LSC_STATE_RECONFIG;
        goto done;
    }

    /* LSC has been in STOPPED state, enable it */
    if (ccdc->lsc.state == LSC_STATE_STOPPED)
        ccdc_lsc_enable(ccdc);

done:
    spin_unlock_irqrestore(&ccdc->lsc.req_lock, flags);
}

/*
 * omap3isp_ccdc_isr - Configure CCDC during interframe time.
 * @ccdc: Pointer to ISP CCDC device.
 * @events: CCDC events
 */
int omap3isp_ccdc_isr(struct isp_ccdc_device *ccdc, u32 events)
{
    if (ccdc->state == ISP_PIPELINE_STREAM_STOPPED)
        return 0;

    if (events & IRQ0STATUS_CCDC_VD1_IRQ)
        ccdc_vd1_isr(ccdc);

    ccdc_lsc_isr(ccdc, events);

    if (events & IRQ0STATUS_CCDC_VD0_IRQ)
        ccdc_vd0_isr(ccdc);

    if (events & IRQ0STATUS_HS_VS_IRQ)
        ccdc_hs_vs_isr(ccdc);

    return 0;
}

/* -----------------------------------------------------------------------------
 * ISP video operations
 */

static int ccdc_video_queue(struct isp_video *video, struct isp_buffer *buffer)
{
    struct isp_ccdc_device *ccdc = &video->isp->isp_ccdc;

    if (!(ccdc->output & CCDC_OUTPUT_MEMORY))
        return -ENODEV;

    ccdc_set_outaddr(ccdc, buffer->isp_addr);

    /* We now have a buffer queued on the output, restart the pipeline
     * on the next CCDC interrupt if running in continuous mode (or when
     * starting the stream).
     */
    ccdc->underrun = 1;

    return 0;
}

static const struct isp_video_operations ccdc_video_ops = {
    .queue = ccdc_video_queue,
};

/* -----------------------------------------------------------------------------
 * V4L2 subdev operations
 */

/*
 * ccdc_ioctl - CCDC module private ioctl's
 * @sd: ISP CCDC V4L2 subdevice
 * @cmd: ioctl command
 * @arg: ioctl argument
 *
 * Return 0 on success or a negative error code otherwise.
 */
static long ccdc_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
{
    struct isp_ccdc_device *ccdc = v4l2_get_subdevdata(sd);
    int ret;

    switch (cmd) {
    case VIDIOC_OMAP3ISP_CCDC_CFG:
        mutex_lock(&ccdc->ioctl_lock);
        ret = ccdc_config(ccdc, arg);
        mutex_unlock(&ccdc->ioctl_lock);
        break;

    default:
        return -ENOIOCTLCMD;
    }

    return ret;
}

static int ccdc_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
                struct v4l2_event_subscription *sub)
{
    if (sub->type != V4L2_EVENT_FRAME_SYNC)
        return -EINVAL;

    /* line number is zero at frame start */
    if (sub->id != 0)
        return -EINVAL;

    return v4l2_event_subscribe(fh, sub, OMAP3ISP_CCDC_NEVENTS, NULL);
}

static int ccdc_unsubscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
                  struct v4l2_event_subscription *sub)
{
    return v4l2_event_unsubscribe(fh, sub);
}

/*
 * ccdc_set_stream - Enable/Disable streaming on the CCDC module
 * @sd: ISP CCDC V4L2 subdevice
 * @enable: Enable/disable stream
 *
 * When writing to memory, the CCDC hardware can't be enabled without a memory
 * buffer to write to. As the s_stream operation is called in response to a
 * STREAMON call without any buffer queued yet, just update the enabled field
 * and return immediately. The CCDC will be enabled in ccdc_isr_buffer().
 *
 * When not writing to memory enable the CCDC immediately.
 */
static int ccdc_set_stream(struct v4l2_subdev *sd, int enable)
{
    struct isp_ccdc_device *ccdc = v4l2_get_subdevdata(sd);
    struct isp_device *isp = to_isp_device(ccdc);
    int ret = 0;

    if (ccdc->state == ISP_PIPELINE_STREAM_STOPPED) {
        if (enable == ISP_PIPELINE_STREAM_STOPPED)
            return 0;

        omap3isp_subclk_enable(isp, OMAP3_ISP_SUBCLK_CCDC);
        isp_reg_set(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_CFG,
                ISPCCDC_CFG_VDLC);

        ccdc_configure(ccdc);

        /* TODO: Don't configure the video port if all of its output
         * links are inactive.
         */
        ccdc_config_vp(ccdc);
        ccdc_enable_vp(ccdc, 1);
        ccdc_print_status(ccdc);
    }

    switch (enable) {
    case ISP_PIPELINE_STREAM_CONTINUOUS:
        if (ccdc->output & CCDC_OUTPUT_MEMORY)
            omap3isp_sbl_enable(isp, OMAP3_ISP_SBL_CCDC_WRITE);

        if (ccdc->underrun || !(ccdc->output & CCDC_OUTPUT_MEMORY))
            ccdc_enable(ccdc);

        ccdc->underrun = 0;
        break;

    case ISP_PIPELINE_STREAM_SINGLESHOT:
        if (ccdc->output & CCDC_OUTPUT_MEMORY &&
            ccdc->state != ISP_PIPELINE_STREAM_SINGLESHOT)
            omap3isp_sbl_enable(isp, OMAP3_ISP_SBL_CCDC_WRITE);

        ccdc_enable(ccdc);
        break;

    case ISP_PIPELINE_STREAM_STOPPED:
        ret = ccdc_disable(ccdc);
        if (ccdc->output & CCDC_OUTPUT_MEMORY)
            omap3isp_sbl_disable(isp, OMAP3_ISP_SBL_CCDC_WRITE);
        omap3isp_subclk_disable(isp, OMAP3_ISP_SUBCLK_CCDC);
        ccdc->underrun = 0;
        break;
    }

    ccdc->state = enable;
    return ret;
}

static struct v4l2_mbus_framefmt *
__ccdc_get_format(struct isp_ccdc_device *ccdc, struct v4l2_subdev_fh *fh,
          unsigned int pad, enum v4l2_subdev_format_whence which)
{
    if (which == V4L2_SUBDEV_FORMAT_TRY)
        return v4l2_subdev_get_try_format(fh, pad);
    else
        return &ccdc->formats[pad];
}

static struct v4l2_rect *
__ccdc_get_crop(struct isp_ccdc_device *ccdc, struct v4l2_subdev_fh *fh,
        enum v4l2_subdev_format_whence which)
{
    if (which == V4L2_SUBDEV_FORMAT_TRY)
        return v4l2_subdev_get_try_crop(fh, CCDC_PAD_SOURCE_OF);
    else
        return &ccdc->crop;
}

/*
 * ccdc_try_format - Try video format on a pad
 * @ccdc: ISP CCDC device
 * @fh : V4L2 subdev file handle
 * @pad: Pad number
 * @fmt: Format
 */
static void
ccdc_try_format(struct isp_ccdc_device *ccdc, struct v4l2_subdev_fh *fh,
        unsigned int pad, struct v4l2_mbus_framefmt *fmt,
        enum v4l2_subdev_format_whence which)
{
    const struct isp_format_info *info;
    enum v4l2_mbus_pixelcode pixelcode;
    unsigned int width = fmt->width;
    unsigned int height = fmt->height;
    struct v4l2_rect *crop;
    unsigned int i;

    switch (pad) {
    case CCDC_PAD_SINK:
        for (i = 0; i < ARRAY_SIZE(ccdc_fmts); i++) {
            if (fmt->code == ccdc_fmts[i])
                break;
        }

        /* If not found, use SGRBG10 as default */
        if (i >= ARRAY_SIZE(ccdc_fmts))
            fmt->code = V4L2_MBUS_FMT_SGRBG10_1X10;

        /* Clamp the input size. */
        fmt->width = clamp_t(u32, width, 32, 4096);
        fmt->height = clamp_t(u32, height, 32, 4096);
        break;

    case CCDC_PAD_SOURCE_OF:
        pixelcode = fmt->code;
        *fmt = *__ccdc_get_format(ccdc, fh, CCDC_PAD_SINK, which);

        /* YUV formats are converted from 2X8 to 1X16 by the bridge and
         * can be byte-swapped.
         */
        if (fmt->code == V4L2_MBUS_FMT_YUYV8_2X8 ||
            fmt->code == V4L2_MBUS_FMT_UYVY8_2X8) {
            /* Use the user requested format if YUV. */
            if (pixelcode == V4L2_MBUS_FMT_YUYV8_2X8 ||
                pixelcode == V4L2_MBUS_FMT_UYVY8_2X8 ||
                pixelcode == V4L2_MBUS_FMT_YUYV8_1X16 ||
                pixelcode == V4L2_MBUS_FMT_UYVY8_1X16)
                fmt->code = pixelcode;

            if (fmt->code == V4L2_MBUS_FMT_YUYV8_2X8)
                fmt->code = V4L2_MBUS_FMT_YUYV8_1X16;
            else if (fmt->code == V4L2_MBUS_FMT_UYVY8_2X8)
                fmt->code = V4L2_MBUS_FMT_UYVY8_1X16;
        }

        /* Hardcode the output size to the crop rectangle size. */
        crop = __ccdc_get_crop(ccdc, fh, which);
        fmt->width = crop->width;
        fmt->height = crop->height;
        break;

    case CCDC_PAD_SOURCE_VP:
        *fmt = *__ccdc_get_format(ccdc, fh, CCDC_PAD_SINK, which);

        /* The video port interface truncates the data to 10 bits. */
        info = omap3isp_video_format_info(fmt->code);
        fmt->code = info->truncated;

        /* YUV formats are not supported by the video port. */
        if (fmt->code == V4L2_MBUS_FMT_YUYV8_2X8 ||
            fmt->code == V4L2_MBUS_FMT_UYVY8_2X8)
            fmt->code = 0;

        /* The number of lines that can be clocked out from the video
         * port output must be at least one line less than the number
         * of input lines.
         */
        fmt->width = clamp_t(u32, width, 32, fmt->width);
        fmt->height = clamp_t(u32, height, 32, fmt->height - 1);
        break;
    }

    /* Data is written to memory unpacked, each 10-bit or 12-bit pixel is
     * stored on 2 bytes.
     */
    fmt->colorspace = V4L2_COLORSPACE_SRGB;
    fmt->field = V4L2_FIELD_NONE;
}

/*
 * ccdc_try_crop - Validate a crop rectangle
 * @ccdc: ISP CCDC device
 * @sink: format on the sink pad
 * @crop: crop rectangle to be validated
 */
static void ccdc_try_crop(struct isp_ccdc_device *ccdc,
              const struct v4l2_mbus_framefmt *sink,
              struct v4l2_rect *crop)
{
    const struct isp_format_info *info;
    unsigned int max_width;

    /* For Bayer formats, restrict left/top and width/height to even values
     * to keep the Bayer pattern.
     */
    info = omap3isp_video_format_info(sink->code);
    if (info->flavor != V4L2_MBUS_FMT_Y8_1X8) {
        crop->left &= ~1;
        crop->top &= ~1;
    }

    crop->left = clamp_t(u32, crop->left, 0, sink->width - CCDC_MIN_WIDTH);
    crop->top = clamp_t(u32, crop->top, 0, sink->height - CCDC_MIN_HEIGHT);

    /* The data formatter truncates the number of horizontal output pixels
     * to a multiple of 16. To avoid clipping data, allow callers to request
     * an output size bigger than the input size up to the nearest multiple
     * of 16.
     */
    max_width = (sink->width - crop->left + 15) & ~15;
    crop->width = clamp_t(u32, crop->width, CCDC_MIN_WIDTH, max_width)
            & ~15;
    crop->height = clamp_t(u32, crop->height, CCDC_MIN_HEIGHT,
                   sink->height - crop->top);

    /* Odd width/height values don't make sense for Bayer formats. */
    if (info->flavor != V4L2_MBUS_FMT_Y8_1X8) {
        crop->width &= ~1;
        crop->height &= ~1;
    }
}

/*
 * ccdc_enum_mbus_code - Handle pixel format enumeration
 * @sd     : pointer to v4l2 subdev structure
 * @fh : V4L2 subdev file handle
 * @code   : pointer to v4l2_subdev_mbus_code_enum structure
 * return -EINVAL or zero on success
 */
static int ccdc_enum_mbus_code(struct v4l2_subdev *sd,
                   struct v4l2_subdev_fh *fh,
                   struct v4l2_subdev_mbus_code_enum *code)
{
    struct isp_ccdc_device *ccdc = v4l2_get_subdevdata(sd);
    struct v4l2_mbus_framefmt *format;

    switch (code->pad) {
    case CCDC_PAD_SINK:
        if (code->index >= ARRAY_SIZE(ccdc_fmts))
            return -EINVAL;

        code->code = ccdc_fmts[code->index];
        break;

    case CCDC_PAD_SOURCE_OF:
        format = __ccdc_get_format(ccdc, fh, code->pad,
                       V4L2_SUBDEV_FORMAT_TRY);

        if (format->code == V4L2_MBUS_FMT_YUYV8_2X8 ||
            format->code == V4L2_MBUS_FMT_UYVY8_2X8) {
            /* In YUV mode the CCDC can swap bytes. */
            if (code->index == 0)
                code->code = V4L2_MBUS_FMT_YUYV8_1X16;
            else if (code->index == 1)
                code->code = V4L2_MBUS_FMT_UYVY8_1X16;
            else
                return -EINVAL;
        } else {
            /* In raw mode, no configurable format confversion is
             * available.
             */
            if (code->index == 0)
                code->code = format->code;
            else
                return -EINVAL;
        }
        break;

    case CCDC_PAD_SOURCE_VP:
        /* The CCDC supports no configurable format conversion
         * compatible with the video port. Enumerate a single output
         * format code.
         */
        if (code->index != 0)
            return -EINVAL;

        format = __ccdc_get_format(ccdc, fh, code->pad,
                       V4L2_SUBDEV_FORMAT_TRY);

        /* A pixel code equal to 0 means that the video port doesn't
         * support the input format. Don't enumerate any pixel code.
         */
        if (format->code == 0)
            return -EINVAL;

        code->code = format->code;
        break;

    default:
        return -EINVAL;
    }

    return 0;
}

static int ccdc_enum_frame_size(struct v4l2_subdev *sd,
                struct v4l2_subdev_fh *fh,
                struct v4l2_subdev_frame_size_enum *fse)
{
    struct isp_ccdc_device *ccdc = v4l2_get_subdevdata(sd);
    struct v4l2_mbus_framefmt format;

    if (fse->index != 0)
        return -EINVAL;

    format.code = fse->code;
    format.width = 1;
    format.height = 1;
    ccdc_try_format(ccdc, fh, fse->pad, &format, V4L2_SUBDEV_FORMAT_TRY);
    fse->min_width = format.width;
    fse->min_height = format.height;

    if (format.code != fse->code)
        return -EINVAL;

    format.code = fse->code;
    format.width = -1;
    format.height = -1;
    ccdc_try_format(ccdc, fh, fse->pad, &format, V4L2_SUBDEV_FORMAT_TRY);
    fse->max_width = format.width;
    fse->max_height = format.height;

    return 0;
}

/*
 * ccdc_get_selection - Retrieve a selection rectangle on a pad
 * @sd: ISP CCDC V4L2 subdevice
 * @fh: V4L2 subdev file handle
 * @sel: Selection rectangle
 *
 * The only supported rectangles are the crop rectangles on the output formatter
 * source pad.
 *
 * Return 0 on success or a negative error code otherwise.
 */
static int ccdc_get_selection(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
                  struct v4l2_subdev_selection *sel)
{
    struct isp_ccdc_device *ccdc = v4l2_get_subdevdata(sd);
    struct v4l2_mbus_framefmt *format;

    if (sel->pad != CCDC_PAD_SOURCE_OF)
        return -EINVAL;

    switch (sel->target) {
    case V4L2_SEL_TGT_CROP_BOUNDS:
        sel->r.left = 0;
        sel->r.top = 0;
        sel->r.width = INT_MAX;
        sel->r.height = INT_MAX;

        format = __ccdc_get_format(ccdc, fh, CCDC_PAD_SINK, sel->which);
        ccdc_try_crop(ccdc, format, &sel->r);
        break;

    case V4L2_SEL_TGT_CROP:
        sel->r = *__ccdc_get_crop(ccdc, fh, sel->which);
        break;

    default:
        return -EINVAL;
    }

    return 0;
}

/*
 * ccdc_set_selection - Set a selection rectangle on a pad
 * @sd: ISP CCDC V4L2 subdevice
 * @fh: V4L2 subdev file handle
 * @sel: Selection rectangle
 *
 * The only supported rectangle is the actual crop rectangle on the output
 * formatter source pad.
 *
 * Return 0 on success or a negative error code otherwise.
 */
static int ccdc_set_selection(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
                  struct v4l2_subdev_selection *sel)
{
    struct isp_ccdc_device *ccdc = v4l2_get_subdevdata(sd);
    struct v4l2_mbus_framefmt *format;

    if (sel->target != V4L2_SEL_TGT_CROP ||
        sel->pad != CCDC_PAD_SOURCE_OF)
        return -EINVAL;

    /* The crop rectangle can't be changed while streaming. */
    if (ccdc->state != ISP_PIPELINE_STREAM_STOPPED)
        return -EBUSY;

    /* Modifying the crop rectangle always changes the format on the source
     * pad. If the KEEP_CONFIG flag is set, just return the current crop
     * rectangle.
     */
    if (sel->flags & V4L2_SEL_FLAG_KEEP_CONFIG) {
        sel->r = *__ccdc_get_crop(ccdc, fh, sel->which);
        return 0;
    }

    format = __ccdc_get_format(ccdc, fh, CCDC_PAD_SINK, sel->which);
    ccdc_try_crop(ccdc, format, &sel->r);
    *__ccdc_get_crop(ccdc, fh, sel->which) = sel->r;

    /* Update the source format. */
    format = __ccdc_get_format(ccdc, fh, CCDC_PAD_SOURCE_OF, sel->which);
    ccdc_try_format(ccdc, fh, CCDC_PAD_SOURCE_OF, format, sel->which);

    return 0;
}

/*
 * ccdc_get_format - Retrieve the video format on a pad
 * @sd : ISP CCDC V4L2 subdevice
 * @fh : V4L2 subdev file handle
 * @fmt: Format
 *
 * Return 0 on success or -EINVAL if the pad is invalid or doesn't correspond
 * to the format type.
 */
static int ccdc_get_format(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
               struct v4l2_subdev_format *fmt)
{
    struct isp_ccdc_device *ccdc = v4l2_get_subdevdata(sd);
    struct v4l2_mbus_framefmt *format;

    format = __ccdc_get_format(ccdc, fh, fmt->pad, fmt->which);
    if (format == NULL)
        return -EINVAL;

    fmt->format = *format;
    return 0;
}

/*
 * ccdc_set_format - Set the video format on a pad
 * @sd : ISP CCDC V4L2 subdevice
 * @fh : V4L2 subdev file handle
 * @fmt: Format
 *
 * Return 0 on success or -EINVAL if the pad is invalid or doesn't correspond
 * to the format type.
 */
static int ccdc_set_format(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
               struct v4l2_subdev_format *fmt)
{
    struct isp_ccdc_device *ccdc = v4l2_get_subdevdata(sd);
    struct v4l2_mbus_framefmt *format;
    struct v4l2_rect *crop;

    format = __ccdc_get_format(ccdc, fh, fmt->pad, fmt->which);
    if (format == NULL)
        return -EINVAL;

    ccdc_try_format(ccdc, fh, fmt->pad, &fmt->format, fmt->which);
    *format = fmt->format;

    /* Propagate the format from sink to source */
    if (fmt->pad == CCDC_PAD_SINK) {
        /* Reset the crop rectangle. */
        crop = __ccdc_get_crop(ccdc, fh, fmt->which);
        crop->left = 0;
        crop->top = 0;
        crop->width = fmt->format.width;
        crop->height = fmt->format.height;

        ccdc_try_crop(ccdc, &fmt->format, crop);

        /* Update the source formats. */
        format = __ccdc_get_format(ccdc, fh, CCDC_PAD_SOURCE_OF,
                       fmt->which);
        *format = fmt->format;
        ccdc_try_format(ccdc, fh, CCDC_PAD_SOURCE_OF, format,
                fmt->which);

        format = __ccdc_get_format(ccdc, fh, CCDC_PAD_SOURCE_VP,
                       fmt->which);
        *format = fmt->format;
        ccdc_try_format(ccdc, fh, CCDC_PAD_SOURCE_VP, format,
                fmt->which);
    }

    return 0;
}

/*
 * Decide whether desired output pixel code can be obtained with
 * the lane shifter by shifting the input pixel code.
 * @in: input pixelcode to shifter
 * @out: output pixelcode from shifter
 * @additional_shift: # of bits the sensor's LSB is offset from CAMEXT[0]
 *
 * return true if the combination is possible
 * return false otherwise
 */
static bool ccdc_is_shiftable(enum v4l2_mbus_pixelcode in,
                  enum v4l2_mbus_pixelcode out,
                  unsigned int additional_shift)
{
    const struct isp_format_info *in_info, *out_info;

    if (in == out)
        return true;

    in_info = omap3isp_video_format_info(in);
    out_info = omap3isp_video_format_info(out);

    if ((in_info->flavor == 0) || (out_info->flavor == 0))
        return false;

    if (in_info->flavor != out_info->flavor)
        return false;

    return in_info->width - out_info->width + additional_shift <= 6;
}

static int ccdc_link_validate(struct v4l2_subdev *sd,
                  struct media_link *link,
                  struct v4l2_subdev_format *source_fmt,
                  struct v4l2_subdev_format *sink_fmt)
{
    struct isp_ccdc_device *ccdc = v4l2_get_subdevdata(sd);
    unsigned long parallel_shift;

    /* Check if the two ends match */
    if (source_fmt->format.width != sink_fmt->format.width ||
        source_fmt->format.height != sink_fmt->format.height)
        return -EPIPE;

    /* We've got a parallel sensor here. */
    if (ccdc->input == CCDC_INPUT_PARALLEL) {
        struct isp_parallel_platform_data *pdata =
            &((struct isp_v4l2_subdevs_group *)
              media_entity_to_v4l2_subdev(link->source->entity)
              ->host_priv)->bus.parallel;
        parallel_shift = pdata->data_lane_shift * 2;
    } else {
        parallel_shift = 0;
    }

    /* Lane shifter may be used to drop bits on CCDC sink pad */
    if (!ccdc_is_shiftable(source_fmt->format.code,
                   sink_fmt->format.code, parallel_shift))
        return -EPIPE;

    return 0;
}

/*
 * ccdc_init_formats - Initialize formats on all pads
 * @sd: ISP CCDC V4L2 subdevice
 * @fh: V4L2 subdev file handle
 *
 * Initialize all pad formats with default values. If fh is not NULL, try
 * formats are initialized on the file handle. Otherwise active formats are
 * initialized on the device.
 */
static int ccdc_init_formats(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
    struct v4l2_subdev_format format;

    memset(&format, 0, sizeof(format));
    format.pad = CCDC_PAD_SINK;
    format.which = fh ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
    format.format.code = V4L2_MBUS_FMT_SGRBG10_1X10;
    format.format.width = 4096;
    format.format.height = 4096;
    ccdc_set_format(sd, fh, &format);

    return 0;
}

/* V4L2 subdev core operations */
static const struct v4l2_subdev_core_ops ccdc_v4l2_core_ops = {
    .ioctl = ccdc_ioctl,
    .subscribe_event = ccdc_subscribe_event,
    .unsubscribe_event = ccdc_unsubscribe_event,
};

/* V4L2 subdev video operations */
static const struct v4l2_subdev_video_ops ccdc_v4l2_video_ops = {
    .s_stream = ccdc_set_stream,
};

/* V4L2 subdev pad operations */
static const struct v4l2_subdev_pad_ops ccdc_v4l2_pad_ops = {
    .enum_mbus_code = ccdc_enum_mbus_code,
    .enum_frame_size = ccdc_enum_frame_size,
    .get_fmt = ccdc_get_format,
    .set_fmt = ccdc_set_format,
    .get_selection = ccdc_get_selection,
    .set_selection = ccdc_set_selection,
    .link_validate = ccdc_link_validate,
};

/* V4L2 subdev operations */
static const struct v4l2_subdev_ops ccdc_v4l2_ops = {
    .core = &ccdc_v4l2_core_ops,
    .video = &ccdc_v4l2_video_ops,
    .pad = &ccdc_v4l2_pad_ops,
};

/* V4L2 subdev internal operations */
static const struct v4l2_subdev_internal_ops ccdc_v4l2_internal_ops = {
    .open = ccdc_init_formats,
};

/* -----------------------------------------------------------------------------
 * Media entity operations
 */

/*
 * ccdc_link_setup - Setup CCDC connections
 * @entity: CCDC media entity
 * @local: Pad at the local end of the link
 * @remote: Pad at the remote end of the link
 * @flags: Link flags
 *
 * return -EINVAL or zero on success
 */
static int ccdc_link_setup(struct media_entity *entity,
               const struct media_pad *local,
               const struct media_pad *remote, u32 flags)
{
    struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
    struct isp_ccdc_device *ccdc = v4l2_get_subdevdata(sd);
    struct isp_device *isp = to_isp_device(ccdc);

    switch (local->index | media_entity_type(remote->entity)) {
    case CCDC_PAD_SINK | MEDIA_ENT_T_V4L2_SUBDEV:
        /* Read from the sensor (parallel interface), CCP2, CSI2a or
         * CSI2c.
         */
        if (!(flags & MEDIA_LNK_FL_ENABLED)) {
            ccdc->input = CCDC_INPUT_NONE;
            break;
        }

        if (ccdc->input != CCDC_INPUT_NONE)
            return -EBUSY;

        if (remote->entity == &isp->isp_ccp2.subdev.entity)
            ccdc->input = CCDC_INPUT_CCP2B;
        else if (remote->entity == &isp->isp_csi2a.subdev.entity)
            ccdc->input = CCDC_INPUT_CSI2A;
        else if (remote->entity == &isp->isp_csi2c.subdev.entity)
            ccdc->input = CCDC_INPUT_CSI2C;
        else
            ccdc->input = CCDC_INPUT_PARALLEL;

        break;

    /*
     * The ISP core doesn't support pipelines with multiple video outputs.
     * Revisit this when it will be implemented, and return -EBUSY for now.
     */

    case CCDC_PAD_SOURCE_VP | MEDIA_ENT_T_V4L2_SUBDEV:
        /* Write to preview engine, histogram and H3A. When none of
         * those links are active, the video port can be disabled.
         */
        if (flags & MEDIA_LNK_FL_ENABLED) {
            if (ccdc->output & ~CCDC_OUTPUT_PREVIEW)
                return -EBUSY;
            ccdc->output |= CCDC_OUTPUT_PREVIEW;
        } else {
            ccdc->output &= ~CCDC_OUTPUT_PREVIEW;
        }
        break;

    case CCDC_PAD_SOURCE_OF | MEDIA_ENT_T_DEVNODE:
        /* Write to memory */
        if (flags & MEDIA_LNK_FL_ENABLED) {
            if (ccdc->output & ~CCDC_OUTPUT_MEMORY)
                return -EBUSY;
            ccdc->output |= CCDC_OUTPUT_MEMORY;
        } else {
            ccdc->output &= ~CCDC_OUTPUT_MEMORY;
        }
        break;

    case CCDC_PAD_SOURCE_OF | MEDIA_ENT_T_V4L2_SUBDEV:
        /* Write to resizer */
        if (flags & MEDIA_LNK_FL_ENABLED) {
            if (ccdc->output & ~CCDC_OUTPUT_RESIZER)
                return -EBUSY;
            ccdc->output |= CCDC_OUTPUT_RESIZER;
        } else {
            ccdc->output &= ~CCDC_OUTPUT_RESIZER;
        }
        break;

    default:
        return -EINVAL;
    }

    return 0;
}

/* media operations */
static const struct media_entity_operations ccdc_media_ops = {
    .link_setup = ccdc_link_setup,
    .link_validate = v4l2_subdev_link_validate,
};

void omap3isp_ccdc_unregister_entities(struct isp_ccdc_device *ccdc)
{
    v4l2_device_unregister_subdev(&ccdc->subdev);
    omap3isp_video_unregister(&ccdc->video_out);
}

int omap3isp_ccdc_register_entities(struct isp_ccdc_device *ccdc,
    struct v4l2_device *vdev)
{
    int ret;

    /* Register the subdev and video node. */
    ret = v4l2_device_register_subdev(vdev, &ccdc->subdev);
    if (ret < 0)
        goto error;

    ret = omap3isp_video_register(&ccdc->video_out, vdev);
    if (ret < 0)
        goto error;

    return 0;

error:
    omap3isp_ccdc_unregister_entities(ccdc);
    return ret;
}

/* -----------------------------------------------------------------------------
 * ISP CCDC initialisation and cleanup
 */

/*
 * ccdc_init_entities - Initialize V4L2 subdev and media entity
 * @ccdc: ISP CCDC module
 *
 * Return 0 on success and a negative error code on failure.
 */
static int ccdc_init_entities(struct isp_ccdc_device *ccdc)
{
    struct v4l2_subdev *sd = &ccdc->subdev;
    struct media_pad *pads = ccdc->pads;
    struct media_entity *me = &sd->entity;
    int ret;

    ccdc->input = CCDC_INPUT_NONE;

    v4l2_subdev_init(sd, &ccdc_v4l2_ops);
    sd->internal_ops = &ccdc_v4l2_internal_ops;
    strlcpy(sd->name, "OMAP3 ISP CCDC", sizeof(sd->name));
    sd->grp_id = 1 << 16;   /* group ID for isp subdevs */
    v4l2_set_subdevdata(sd, ccdc);
    sd->flags |= V4L2_SUBDEV_FL_HAS_EVENTS | V4L2_SUBDEV_FL_HAS_DEVNODE;

    pads[CCDC_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
    pads[CCDC_PAD_SOURCE_VP].flags = MEDIA_PAD_FL_SOURCE;
    pads[CCDC_PAD_SOURCE_OF].flags = MEDIA_PAD_FL_SOURCE;

    me->ops = &ccdc_media_ops;
    ret = media_entity_init(me, CCDC_PADS_NUM, pads, 0);
    if (ret < 0)
        return ret;

    ccdc_init_formats(sd, NULL);

    ccdc->video_out.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    ccdc->video_out.ops = &ccdc_video_ops;
    ccdc->video_out.isp = to_isp_device(ccdc);
    ccdc->video_out.capture_mem = PAGE_ALIGN(4096 * 4096) * 3;
    ccdc->video_out.bpl_alignment = 32;

    ret = omap3isp_video_init(&ccdc->video_out, "CCDC");
    if (ret < 0)
        goto error_video;

    /* Connect the CCDC subdev to the video node. */
    ret = media_entity_create_link(&ccdc->subdev.entity, CCDC_PAD_SOURCE_OF,
            &ccdc->video_out.video.entity, 0, 0);
    if (ret < 0)
        goto error_link;

    return 0;

error_link:
    omap3isp_video_cleanup(&ccdc->video_out);
error_video:
    media_entity_cleanup(me);
    return ret;
}

/*
 * omap3isp_ccdc_init - CCDC module initialization.
 * @dev: Device pointer specific to the OMAP3 ISP.
 *
 * TODO: Get the initialisation values from platform data.
 *
 * Return 0 on success or a negative error code otherwise.
 */
int omap3isp_ccdc_init(struct isp_device *isp)
{
    struct isp_ccdc_device *ccdc = &isp->isp_ccdc;
    int ret;

    spin_lock_init(&ccdc->lock);
    init_waitqueue_head(&ccdc->wait);
    mutex_init(&ccdc->ioctl_lock);

    ccdc->stopping = CCDC_STOP_NOT_REQUESTED;

    INIT_WORK(&ccdc->lsc.table_work, ccdc_lsc_free_table_work);
    ccdc->lsc.state = LSC_STATE_STOPPED;
    INIT_LIST_HEAD(&ccdc->lsc.free_queue);
    spin_lock_init(&ccdc->lsc.req_lock);

    ccdc->clamp.oblen = 0;
    ccdc->clamp.dcsubval = 0;

    ccdc->update = OMAP3ISP_CCDC_BLCLAMP;
    ccdc_apply_controls(ccdc);

    ret = ccdc_init_entities(ccdc);
    if (ret < 0) {
        mutex_destroy(&ccdc->ioctl_lock);
        return ret;
    }

    return 0;
}

/*
 * omap3isp_ccdc_cleanup - CCDC module cleanup.
 * @dev: Device pointer specific to the OMAP3 ISP.
 */
void omap3isp_ccdc_cleanup(struct isp_device *isp)
{
    struct isp_ccdc_device *ccdc = &isp->isp_ccdc;

    omap3isp_video_cleanup(&ccdc->video_out);
    media_entity_cleanup(&ccdc->subdev.entity);

    /* Free LSC requests. As the CCDC is stopped there's no active request,
     * so only the pending request and the free queue need to be handled.
     */
    ccdc_lsc_free_request(ccdc, ccdc->lsc.request);
    cancel_work_sync(&ccdc->lsc.table_work);
    ccdc_lsc_free_queue(ccdc, &ccdc->lsc.free_queue);

    if (ccdc->fpc.fpcaddr != 0)
        omap_iommu_vfree(isp->domain, isp->dev, ccdc->fpc.fpcaddr);

    mutex_destroy(&ccdc->ioctl_lock);
}