/*
 * ispccdc.c
 *
 * TI OMAP3 ISP - CCDC module
 *
 * Copyright (C) 2009-2010 Nokia Corporation
 * Copyright (C) 2009 Texas Instruments, Inc.
 *
 * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 *           Sakari Ailus <sakari.ailus@iki.fi>
 *
 * 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.
 */

#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_pad_config *cfg,
                  unsigned int pad, enum v4l2_subdev_format_whence which);

static const unsigned int ccdc_fmts[] = {
        MEDIA_BUS_FMT_Y8_1X8,
        MEDIA_BUS_FMT_Y10_1X10,
        MEDIA_BUS_FMT_Y12_1X12,
        MEDIA_BUS_FMT_SGRBG8_1X8,
        MEDIA_BUS_FMT_SRGGB8_1X8,
        MEDIA_BUS_FMT_SBGGR8_1X8,
        MEDIA_BUS_FMT_SGBRG8_1X8,
        MEDIA_BUS_FMT_SGRBG10_1X10,
        MEDIA_BUS_FMT_SRGGB10_1X10,
        MEDIA_BUS_FMT_SBGGR10_1X10,
        MEDIA_BUS_FMT_SGBRG10_1X10,
        MEDIA_BUS_FMT_SGRBG12_1X12,
        MEDIA_BUS_FMT_SRGGB12_1X12,
        MEDIA_BUS_FMT_SBGGR12_1X12,
        MEDIA_BUS_FMT_SGBRG12_1X12,
        MEDIA_BUS_FMT_YUYV8_2X8,
        MEDIA_BUS_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,
                                   dma_addr_t 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 != MEDIA_BUS_FMT_SGRBG10_1X10) &&
            (format->code != MEDIA_BUS_FMT_SRGGB10_1X10) &&
            (format->code != MEDIA_BUS_FMT_SBGGR10_1X10) &&
            (format->code != MEDIA_BUS_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 prefetch 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.dma);
        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->table.addr) {
                sg_free_table(&req->table.sgt);
                dma_free_coherent(isp->dev, req->config.size, req->table.addr,
                                  req->table.dma);
        }

        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;
        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.addr = dma_alloc_coherent(isp->dev, req->config.size,
                                                     &req->table.dma,
                                                     GFP_KERNEL);
                if (req->table.addr == NULL) {
                        ret = -ENOMEM;
                        goto done;
                }

                ret = dma_get_sgtable(isp->dev, &req->table.sgt,
                                      req->table.addr, req->table.dma,
                                      req->config.size);
                if (ret < 0)
                        goto done;

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

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

                dma_sync_sg_for_device(isp->dev, req->table.sgt.sgl,
                                       req->table.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;
        int ret;

        spin_lock_irqsave(&ccdc->lsc.req_lock, flags);
        ret = ccdc->lsc.active != NULL;
        spin_unlock_irqrestore(&ccdc->lsc.req_lock, flags);

        return ret;
}

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.dma, 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.
 * @ccdc_struct: 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) {
                struct omap3isp_ccdc_fpc fpc;
                struct ispccdc_fpc fpc_old = { .addr = NULL, };
                struct ispccdc_fpc fpc_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(&fpc, ccdc_struct->fpc, sizeof(fpc)))
                                return -EFAULT;

                        size = fpc.fpnum * 4;

                        /*
                         * The table address must be 64-bytes aligned, which is
                         * guaranteed by dma_alloc_coherent().
                         */
                        fpc_new.fpnum = fpc.fpnum;
                        fpc_new.addr = dma_alloc_coherent(isp->dev, size,
                                                          &fpc_new.dma,
                                                          GFP_KERNEL);
                        if (fpc_new.addr == NULL)
                                return -ENOMEM;

                        if (copy_from_user(fpc_new.addr,
                                           (__force void __user *)(long)fpc.fpcaddr,
                                           size)) {
                                dma_free_coherent(isp->dev, size, fpc_new.addr,
                                                  fpc_new.dma);
                                return -EFAULT;
                        }

                        fpc_old = ccdc->fpc;
                        ccdc->fpc = fpc_new;
                }

                ccdc_configure_fpc(ccdc);

                if (fpc_old.addr != NULL)
                        dma_free_coherent(isp->dev, fpc_old.fpnum * 4,
                                          fpc_old.addr, fpc_old.dma);
        }

        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
 * @isp: 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;
        struct v4l2_mbus_framefmt *format;
        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 = ISPCCDC_FMTCFG_VPEN;

        format = &ccdc->formats[CCDC_PAD_SOURCE_VP];

        if (!format->code) {
                /* Disable the video port when the input format isn't supported.
                 * This is indicated by a pixel code set to 0.
                 */
                isp_reg_writel(isp, 0, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_FMTCFG);
                return;
        }

        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);

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

        switch (info->width) {
        case 8:
        case 10:
                fmtcfg |= ISPCCDC_FMTCFG_VPIN_9_0;
                break;
        case 11:
                fmtcfg |= ISPCCDC_FMTCFG_VPIN_10_1;
                break;
        case 12:
                fmtcfg |= ISPCCDC_FMTCFG_VPIN_11_2;
                break;
        case 13:
                fmtcfg |= 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 |= (div - 2) << ISPCCDC_FMTCFG_VPIF_FRQ_SHIFT;

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

/*
 * ccdc_config_outlineoffset - Configure memory saving output line offset
 * @ccdc: Pointer to ISP CCDC device.
 * @bpl: Number of bytes per line when stored in memory.
 * @field: Field order when storing interlaced formats in memory.
 *
 * Configure the offsets for the line output control:
 *
 * - The horizontal line offset is defined as the number of bytes between the
 *   start of two consecutive lines in memory. Set it to the given bytes per
 *   line value.
 *
 * - The field offset value is defined as the number of lines to offset the
 *   start of the field identified by FID = 1. Set it to one.
 *
 * - The line offset values are defined as the number of lines (as defined by
 *   the horizontal line offset) between the start of two consecutive lines for
 *   all combinations of odd/even lines in odd/even fields. When interleaving
 *   fields set them all to two lines, and to one line otherwise.
 */
static void ccdc_config_outlineoffset(struct isp_ccdc_device *ccdc,
                                      unsigned int bpl,
                                      enum v4l2_field field)
{
        struct isp_device *isp = to_isp_device(ccdc);
        u32 sdofst = 0;

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

        switch (field) {
        case V4L2_FIELD_INTERLACED_TB:
        case V4L2_FIELD_INTERLACED_BT:
                /* When interleaving fields in memory offset field one by one
                 * line and set the line offset to two lines.
                 */
                sdofst |= (1 << ISPCCDC_SDOFST_LOFST0_SHIFT)
                       |  (1 << ISPCCDC_SDOFST_LOFST1_SHIFT)
                       |  (1 << ISPCCDC_SDOFST_LOFST2_SHIFT)
                       |  (1 << ISPCCDC_SDOFST_LOFST3_SHIFT);
                break;

        default:
                /* In all other cases set the line offsets to one line. */
                break;
        }

        isp_reg_writel(isp, sdofst, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_SDOFST);
}

/*
 * 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.
 * @parcfg: 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_cfg *parcfg,
                                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 == MEDIA_BUS_FMT_YUYV8_2X8 ||
            format->code == MEDIA_BUS_FMT_UYVY8_2X8) {
                /* According to the OMAP3 TRM the input mode only affects SYNC
                 * mode, enabling BT.656 mode should take precedence. However,
                 * in practice setting the input mode to YCbCr data on 8 bits
                 * seems to be required in BT.656 mode. In SYNC mode set it to
                 * YCbCr on 16 bits as the bridge is enabled in that case.
                 */
                if (ccdc->bt656)
                        syn_mode |= ISPCCDC_SYN_MODE_INPMOD_YCBCR8;
                else
                        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 (parcfg && parcfg->data_pol)
                syn_mode |= ISPCCDC_SYN_MODE_DATAPOL;

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

        /* The polarity of the vertical sync signal output by the BT.656
         * decoder is not documented and seems to be active low.
         */
        if ((parcfg && parcfg->vs_pol) || ccdc->bt656)
                syn_mode |= ISPCCDC_SYN_MODE_VDPOL;

        if (parcfg && parcfg->fld_pol)
                syn_mode |= ISPCCDC_SYN_MODE_FLDPOL;

        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 == MEDIA_BUS_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);

        /* Enable or disable BT.656 mode, including error correction for the
         * synchronization codes.
         */
        if (ccdc->bt656)
                isp_reg_set(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_REC656IF,
                            ISPCCDC_REC656IF_R656ON | ISPCCDC_REC656IF_ECCFVH);
        else
                isp_reg_clr(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_REC656IF,
                            ISPCCDC_REC656IF_R656ON | ISPCCDC_REC656IF_ECCFVH);

}

/* 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_cfg *parcfg = 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;
        unsigned int nph;
        unsigned int sph;
        u32 syn_mode;
        u32 ccdc_pattern;

        ccdc->bt656 = false;
        ccdc->fields = 0;

        pad = media_entity_remote_pad(&ccdc->pads[CCDC_PAD_SINK]);
        sensor = media_entity_to_v4l2_subdev(pad->entity);
        if (ccdc->input == CCDC_INPUT_PARALLEL) {
                struct v4l2_subdev *sd =
                        to_isp_pipeline(&ccdc->subdev.entity)->external;

                parcfg = &v4l2_subdev_to_bus_cfg(sd)->bus.parallel;
                ccdc->bt656 = parcfg->bt656;
        }

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

        /* Compute the lane shifter shift value and enable the bridge when the
         * input format is a non-BT.656 YUV variant.
         */
        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(format->code);
        depth_out = fmt_info->width;
        shift = depth_in - depth_out;

        if (ccdc->bt656)
                bridge = ISPCTRL_PAR_BRIDGE_DISABLE;
        else if (fmt_info->code == MEDIA_BUS_FMT_YUYV8_2X8)
                bridge = ISPCTRL_PAR_BRIDGE_LENDIAN;
        else if (fmt_info->code == MEDIA_BUS_FMT_UYVY8_2X8)
                bridge = ISPCTRL_PAR_BRIDGE_BENDIAN;
        else
                bridge = ISPCTRL_PAR_BRIDGE_DISABLE;

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

        /* Configure the sync interface. */
        ccdc_config_sync_if(ccdc, parcfg, 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;

        /* Mosaic filter */
        switch (format->code) {
        case MEDIA_BUS_FMT_SRGGB10_1X10:
        case MEDIA_BUS_FMT_SRGGB12_1X12:
                ccdc_pattern = ccdc_srggb_pattern;
                break;
        case MEDIA_BUS_FMT_SBGGR10_1X10:
        case MEDIA_BUS_FMT_SBGGR12_1X12:
                ccdc_pattern = ccdc_sbggr_pattern;
                break;
        case MEDIA_BUS_FMT_SGBRG10_1X10:
        case MEDIA_BUS_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;

        /* The horizontal coordinates are expressed in pixel clock cycles. We
         * need two cycles per pixel in BT.656 mode, and one cycle per pixel in
         * SYNC mode regardless of the format as the bridge is enabled for YUV
         * formats in that case.
         */
        if (ccdc->bt656) {
                sph = crop->left * 2;
                nph = crop->width * 2 - 1;
        } else {
                sph = crop->left;
                nph = crop->width - 1;
        }

        isp_reg_writel(isp, (sph << ISPCCDC_HORZ_INFO_SPH_SHIFT) |
                       (nph << ISPCCDC_HORZ_INFO_NPH_SHIFT),
                       OMAP3_ISP_IOMEM_CCDC, ISPCCDC_HORZ_INFO);
        isp_reg_writel(isp, (crop->top << ISPCCDC_VERT_START_SLV0_SHIFT) |
                       (crop->top << ISPCCDC_VERT_START_SLV1_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,
                                  format->field);

        /* When interleaving fields enable processing of the field input signal.
         * This will cause the line output control module to apply the field
         * offset to field 1.
         */
        if (ccdc->formats[CCDC_PAD_SINK].field == V4L2_FIELD_ALTERNATE &&
            (format->field == V4L2_FIELD_INTERLACED_TB ||
             format->field == V4L2_FIELD_INTERLACED_BT))
                syn_mode |= ISPCCDC_SYN_MODE_FLDMODE;

        /* The CCDC outputs data in UYVY order by default. Swap bytes to get
         * YUYV.
         */
        if (format->code == MEDIA_BUS_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. Check for BT.656 mode
         * explicitly as the driver reports 1X16 instead of 2X8 at the OF pad
         * for simplicity.
         */
        if (omap3isp_video_format_info(format->code)->width <= 8 || ccdc->bt656)
                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 */
        ccdc_config_vp(ccdc);

        /* 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);

        ccdc->running = enable;
}

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;
        if (!ccdc->running)
                ccdc->stopping = CCDC_STOP_FINISHED;
        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);
}

/*
 * Check whether the CCDC has captured all fields necessary to complete the
 * buffer.
 */
static bool ccdc_has_all_fields(struct isp_ccdc_device *ccdc)
{
        struct isp_pipeline *pipe = to_isp_pipeline(&ccdc->subdev.entity);
        struct isp_device *isp = to_isp_device(ccdc);
        enum v4l2_field of_field = ccdc->formats[CCDC_PAD_SOURCE_OF].field;
        enum v4l2_field field;

        /* When the input is progressive fields don't matter. */
        if (of_field == V4L2_FIELD_NONE)
                return true;

        /* Read the current field identifier. */
        field = isp_reg_readl(isp, OMAP3_ISP_IOMEM_CCDC, ISPCCDC_SYN_MODE)
              & ISPCCDC_SYN_MODE_FLDSTAT
              ? V4L2_FIELD_BOTTOM : V4L2_FIELD_TOP;

        /* When capturing fields in alternate order just store the current field
         * identifier in the pipeline.
         */
        if (of_field == V4L2_FIELD_ALTERNATE) {
                pipe->field = field;
                return true;
        }

        /* The format is interlaced. Make sure we've captured both fields. */
        ccdc->fields |= field == V4L2_FIELD_BOTTOM
                      ? CCDC_FIELD_BOTTOM : CCDC_FIELD_TOP;

        if (ccdc->fields != CCDC_FIELD_BOTH)
                return false;

        /* Verify that the field just captured corresponds to the last field
         * needed based on the desired field order.
         */
        if ((of_field == V4L2_FIELD_INTERLACED_TB && field == V4L2_FIELD_TOP) ||
            (of_field == V4L2_FIELD_INTERLACED_BT && field == V4L2_FIELD_BOTTOM))
                return false;

        /* The buffer can be completed, reset the fields for the next buffer. */
        ccdc->fields = 0;

        return true;
}

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;

        /* 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))
                return 0;

        /* 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) {
                ccdc->underrun = 0;
                return 1;
        }

        /* Wait for the CCDC to become idle. */
        if (ccdc_sbl_wait_idle(ccdc, 1000)) {
                dev_info(isp->dev, "CCDC won't become idle!\n");
                media_entity_enum_set(&isp->crashed, &ccdc->subdev.entity);
                omap3isp_pipeline_cancel_stream(pipe);
                return 0;
        }

        if (!ccdc_has_all_fields(ccdc))
                return 1;

        buffer = omap3isp_video_buffer_next(&ccdc->video_out);
        if (buffer != NULL)
                ccdc_set_outaddr(ccdc, buffer->dma);

        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);

        return buffer != NULL;
}

/*
 * 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;

        /* In BT.656 mode the CCDC doesn't generate an HS/VS interrupt. We thus
         * need to increment the frame counter here.
         */
        if (ccdc->bt656) {
                struct isp_pipeline *pipe =
                        to_isp_pipeline(&ccdc->subdev.entity);

                atomic_inc(&pipe->frame_number);
        }

        /* Emulate a VD1 interrupt for BT.656 mode, as we can't stop the CCDC in
         * the VD1 interrupt handler in that mode without risking a CCDC stall
         * if a short frame is received.
         */
        if (ccdc->bt656) {
                spin_lock_irqsave(&ccdc->lock, flags);
                if (ccdc->state == ISP_PIPELINE_STREAM_CONTINUOUS &&
                    ccdc->output & CCDC_OUTPUT_MEMORY) {
                        if (ccdc->lsc.state != LSC_STATE_STOPPED)
                                __ccdc_lsc_enable(ccdc, 0);
                        __ccdc_enable(ccdc, 0);
                }
                ccdc_handle_stopping(ccdc, CCDC_EVENT_VD1);
                spin_unlock_irqrestore(&ccdc->lock, flags);
        }

        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;

        /* In BT.656 mode the synchronization signals are generated by the CCDC
         * from the embedded sync codes. The VD0 and VD1 interrupts are thus
         * only triggered when the CCDC is enabled, unlike external sync mode
         * where the line counter runs even when the CCDC is stopped. We can't
         * disable the CCDC at VD1 time, as no VD0 interrupt would be generated
         * for a short frame, which would result in the CCDC being stopped and
         * no VD interrupt generated anymore. The CCDC is stopped from the VD0
         * interrupt handler instead for BT.656.
         */
        if (ccdc->bt656)
                return;

        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;
        unsigned long flags;
        bool restart = false;

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

        ccdc_set_outaddr(ccdc, buffer->dma);

        /* 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) in external sync mode, or immediately in BT.656
         * sync mode as no CCDC interrupt is generated when the CCDC is stopped
         * in that case.
         */
        spin_lock_irqsave(&ccdc->lock, flags);
        if (ccdc->state == ISP_PIPELINE_STREAM_CONTINUOUS && !ccdc->running &&
            ccdc->bt656)
                restart = true;
        else
                ccdc->underrun = 1;
        spin_unlock_irqrestore(&ccdc->lock, flags);

        if (restart)
                ccdc_enable(ccdc);

        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);

                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_pad_config *cfg,
                  unsigned int pad, enum v4l2_subdev_format_whence which)
{
        if (which == V4L2_SUBDEV_FORMAT_TRY)
                return v4l2_subdev_get_try_format(&ccdc->subdev, cfg, pad);
        else
                return &ccdc->formats[pad];
}

static struct v4l2_rect *
__ccdc_get_crop(struct isp_ccdc_device *ccdc, struct v4l2_subdev_pad_config *cfg,
                enum v4l2_subdev_format_whence which)
{
        if (which == V4L2_SUBDEV_FORMAT_TRY)
                return v4l2_subdev_get_try_crop(&ccdc->subdev, cfg, CCDC_PAD_SOURCE_OF);
        else
                return &ccdc->crop;
}

/*
 * ccdc_try_format - Try video format on a pad
 * @ccdc: ISP CCDC device
 * @cfg : V4L2 subdev pad configuration
 * @pad: Pad number
 * @fmt: Format
 */
static void
ccdc_try_format(struct isp_ccdc_device *ccdc, struct v4l2_subdev_pad_config *cfg,
                unsigned int pad, struct v4l2_mbus_framefmt *fmt,
                enum v4l2_subdev_format_whence which)
{
        const struct isp_format_info *info;
        u32 pixelcode;
        unsigned int width = fmt->width;
        unsigned int height = fmt->height;
        struct v4l2_rect *crop;
        enum v4l2_field field;
        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 = MEDIA_BUS_FMT_SGRBG10_1X10;

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

                /* Default to progressive field order. */
                if (fmt->field == V4L2_FIELD_ANY)
                        fmt->field = V4L2_FIELD_NONE;

                break;

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

                /* In SYNC mode the bridge converts YUV formats from 2X8 to

                 * 1X16. In BT.656 no such conversion occurs. As we don't know
                 * at this point whether the source will use SYNC or BT.656 mode
                 * let's pretend the conversion always occurs. The CCDC will be
                 * configured to pack bytes in BT.656, hiding the inaccuracy.
                 * In all cases bytes can be swapped.
                 */
                if (fmt->code == MEDIA_BUS_FMT_YUYV8_2X8 ||
                    fmt->code == MEDIA_BUS_FMT_UYVY8_2X8) {
                        /* Use the user requested format if YUV. */
                        if (pixelcode == MEDIA_BUS_FMT_YUYV8_2X8 ||
                            pixelcode == MEDIA_BUS_FMT_UYVY8_2X8 ||
                            pixelcode == MEDIA_BUS_FMT_YUYV8_1X16 ||
                            pixelcode == MEDIA_BUS_FMT_UYVY8_1X16)
                                fmt->code = pixelcode;

                        if (fmt->code == MEDIA_BUS_FMT_YUYV8_2X8)
                                fmt->code = MEDIA_BUS_FMT_YUYV8_1X16;
                        else if (fmt->code == MEDIA_BUS_FMT_UYVY8_2X8)
                                fmt->code = MEDIA_BUS_FMT_UYVY8_1X16;
                }

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

                /* When input format is interlaced with alternating fields the
                 * CCDC can interleave the fields.
                 */
                if (fmt->field == V4L2_FIELD_ALTERNATE &&
                    (field == V4L2_FIELD_INTERLACED_TB ||
                     field == V4L2_FIELD_INTERLACED_BT)) {
                        fmt->field = field;
                        fmt->height *= 2;
                }

                break;

        case CCDC_PAD_SOURCE_VP:
                *fmt = *__ccdc_get_format(ccdc, cfg, 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 == MEDIA_BUS_FMT_YUYV8_2X8 ||
                    fmt->code == MEDIA_BUS_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;
}

/*
 * 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 != MEDIA_BUS_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 != MEDIA_BUS_FMT_Y8_1X8) {
                crop->width &= ~1;
                crop->height &= ~1;
        }
}

/*
 * ccdc_enum_mbus_code - Handle pixel format enumeration
 * @sd     : pointer to v4l2 subdev structure
 * @cfg : V4L2 subdev pad configuration
 * @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_pad_config *cfg,
                               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, cfg, code->pad,
                                           code->which);

                if (format->code == MEDIA_BUS_FMT_YUYV8_2X8 ||
                    format->code == MEDIA_BUS_FMT_UYVY8_2X8) {
                        /* In YUV mode the CCDC can swap bytes. */
                        if (code->index == 0)
                                code->code = MEDIA_BUS_FMT_YUYV8_1X16;
                        else if (code->index == 1)
                                code->code = MEDIA_BUS_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, cfg, code->pad,
                                           code->which);

                /* 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_pad_config *cfg,
                                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, cfg, fse->pad, &format, fse->which);
        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, cfg, fse->pad, &format, fse->which);
        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
 * @cfg: V4L2 subdev pad configuration
 * @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_pad_config *cfg,
                              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, cfg, CCDC_PAD_SINK, sel->which);
                ccdc_try_crop(ccdc, format, &sel->r);
                break;

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

        default:
                return -EINVAL;
        }

        return 0;
}

/*
 * ccdc_set_selection - Set a selection rectangle on a pad
 * @sd: ISP CCDC V4L2 subdevice
 * @cfg: V4L2 subdev pad configuration
 * @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_pad_config *cfg,
                              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, cfg, sel->which);
                return 0;
        }

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

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

        return 0;
}

/*
 * ccdc_get_format - Retrieve the video format on a pad
 * @sd : ISP CCDC V4L2 subdevice
 * @cfg: V4L2 subdev pad configuration
 * @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_pad_config *cfg,
                           struct v4l2_subdev_format *fmt)
{
        struct isp_ccdc_device *ccdc = v4l2_get_subdevdata(sd);
        struct v4l2_mbus_framefmt *format;

        format = __ccdc_get_format(ccdc, cfg, 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
 * @cfg: V4L2 subdev pad configuration
 * @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_pad_config *cfg,
                           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, cfg, fmt->pad, fmt->which);
        if (format == NULL)
                return -EINVAL;

        ccdc_try_format(ccdc, cfg, 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, cfg, 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, cfg, CCDC_PAD_SOURCE_OF,
                                           fmt->which);
                *format = fmt->format;
                ccdc_try_format(ccdc, cfg, CCDC_PAD_SOURCE_OF, format,
                                fmt->which);

                format = __ccdc_get_format(ccdc, cfg, CCDC_PAD_SOURCE_VP,
                                           fmt->which);
                *format = fmt->format;
                ccdc_try_format(ccdc, cfg, 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(u32 in, u32 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 v4l2_subdev *sd =
                        media_entity_to_v4l2_subdev(link->source->entity);
                struct isp_bus_cfg *bus_cfg = v4l2_subdev_to_bus_cfg(sd);

                parallel_shift = bus_cfg->bus.parallel.data_lane_shift;
        } 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 = MEDIA_BUS_FMT_SGRBG10_1X10;
        format.format.width = 4096;
        format.format.height = 4096;
        ccdc_set_format(sd, fh ? fh->pad : NULL, &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);
        unsigned int index = local->index;

        /* FIXME: this is actually a hack! */
        if (is_media_entity_v4l2_subdev(remote->entity))
                index |= 2 << 16;

        switch (index) {
        case CCDC_PAD_SINK | 2 << 16:
                /* 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 | 2 << 16:
                /* 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:
                /* 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 | 2 << 16:
                /* 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
                                    | MEDIA_PAD_FL_MUST_CONNECT;
        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_pads_init(me, CCDC_PADS_NUM, pads);
        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;

        return 0;

error:
        media_entity_cleanup(me);
        return ret;
}

/*
 * omap3isp_ccdc_init - CCDC module initialization.
 * @isp: 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.
 * @isp: 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.addr != NULL)
                dma_free_coherent(isp->dev, ccdc->fpc.fpnum * 4, ccdc->fpc.addr,
                                  ccdc->fpc.dma);

        mutex_destroy(&ccdc->ioctl_lock);
}