// SPDX-License-Identifier: GPL-2.0+
/*
 * TI OMAP4 ISS V4L2 Driver - CSI PHY module
 *
 * Copyright (C) 2012 Texas Instruments, Inc.
 *
 * Author: Sergio Aguirre <sergio.a.aguirre@gmail.com>
 */

#include <linux/delay.h>
#include <media/v4l2-common.h>
#include <linux/v4l2-mediabus.h>
#include <linux/mm.h>

#include "iss.h"
#include "iss_regs.h"
#include "iss_csi2.h"

/*
 * csi2_if_enable - Enable CSI2 Receiver interface.
 * @enable: enable flag
 *
 */
static void csi2_if_enable(struct iss_csi2_device *csi2, u8 enable)
{
        struct iss_csi2_ctrl_cfg *currctrl = &csi2->ctrl;

        iss_reg_update(csi2->iss, csi2->regs1, CSI2_CTRL, CSI2_CTRL_IF_EN,
                       enable ? CSI2_CTRL_IF_EN : 0);

        currctrl->if_enable = enable;
}

/*
 * csi2_recv_config - CSI2 receiver module configuration.
 * @currctrl: iss_csi2_ctrl_cfg structure
 *
 */
static void csi2_recv_config(struct iss_csi2_device *csi2,
                             struct iss_csi2_ctrl_cfg *currctrl)
{
        u32 reg = 0;

        if (currctrl->frame_mode)
                reg |= CSI2_CTRL_FRAME;
        else
                reg &= ~CSI2_CTRL_FRAME;

        if (currctrl->vp_clk_enable)
                reg |= CSI2_CTRL_VP_CLK_EN;
        else
                reg &= ~CSI2_CTRL_VP_CLK_EN;

        if (currctrl->vp_only_enable)
                reg |= CSI2_CTRL_VP_ONLY_EN;
        else
                reg &= ~CSI2_CTRL_VP_ONLY_EN;

        reg &= ~CSI2_CTRL_VP_OUT_CTRL_MASK;
        reg |= currctrl->vp_out_ctrl << CSI2_CTRL_VP_OUT_CTRL_SHIFT;

        if (currctrl->ecc_enable)
                reg |= CSI2_CTRL_ECC_EN;
        else
                reg &= ~CSI2_CTRL_ECC_EN;

        /*
         * Set MFlag assertion boundaries to:
         * Low: 4/8 of FIFO size
         * High: 6/8 of FIFO size
         */
        reg &= ~(CSI2_CTRL_MFLAG_LEVH_MASK | CSI2_CTRL_MFLAG_LEVL_MASK);
        reg |= (2 << CSI2_CTRL_MFLAG_LEVH_SHIFT) |
               (4 << CSI2_CTRL_MFLAG_LEVL_SHIFT);

        /* Generation of 16x64-bit bursts (Recommended) */
        reg |= CSI2_CTRL_BURST_SIZE_EXPAND;

        /* Do Non-Posted writes (Recommended) */
        reg |= CSI2_CTRL_NON_POSTED_WRITE;

        /*
         * Enforce Little endian for all formats, including:
         * YUV4:2:2 8-bit and YUV4:2:0 Legacy
         */
        reg |= CSI2_CTRL_ENDIANNESS;

        iss_reg_write(csi2->iss, csi2->regs1, CSI2_CTRL, reg);
}

static const unsigned int csi2_input_fmts[] = {
        MEDIA_BUS_FMT_SGRBG10_1X10,
        MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8,
        MEDIA_BUS_FMT_SRGGB10_1X10,
        MEDIA_BUS_FMT_SRGGB10_DPCM8_1X8,
        MEDIA_BUS_FMT_SBGGR10_1X10,
        MEDIA_BUS_FMT_SBGGR10_DPCM8_1X8,
        MEDIA_BUS_FMT_SGBRG10_1X10,
        MEDIA_BUS_FMT_SGBRG10_DPCM8_1X8,
        MEDIA_BUS_FMT_SBGGR8_1X8,
        MEDIA_BUS_FMT_SGBRG8_1X8,
        MEDIA_BUS_FMT_SGRBG8_1X8,
        MEDIA_BUS_FMT_SRGGB8_1X8,
        MEDIA_BUS_FMT_UYVY8_1X16,
        MEDIA_BUS_FMT_YUYV8_1X16,
};

/* To set the format on the CSI2 requires a mapping function that takes
 * the following inputs:
 * - 3 different formats (at this time)
 * - 2 destinations (mem, vp+mem) (vp only handled separately)
 * - 2 decompression options (on, off)
 * Output should be CSI2 frame format code
 * Array indices as follows: [format][dest][decompr]
 * Not all combinations are valid. 0 means invalid.
 */
static const u16 __csi2_fmt_map[][2][2] = {
        /* RAW10 formats */
        {
                /* Output to memory */
                {
                        /* No DPCM decompression */
                        CSI2_PIX_FMT_RAW10_EXP16,
                        /* DPCM decompression */
                        0,
                },
                /* Output to both */
                {
                        /* No DPCM decompression */
                        CSI2_PIX_FMT_RAW10_EXP16_VP,
                        /* DPCM decompression */
                        0,
                },
        },
        /* RAW10 DPCM8 formats */
        {
                /* Output to memory */
                {
                        /* No DPCM decompression */
                        CSI2_USERDEF_8BIT_DATA1,
                        /* DPCM decompression */
                        CSI2_USERDEF_8BIT_DATA1_DPCM10,
                },
                /* Output to both */
                {
                        /* No DPCM decompression */
                        CSI2_PIX_FMT_RAW8_VP,
                        /* DPCM decompression */
                        CSI2_USERDEF_8BIT_DATA1_DPCM10_VP,
                },
        },
        /* RAW8 formats */
        {
                /* Output to memory */
                {
                        /* No DPCM decompression */
                        CSI2_PIX_FMT_RAW8,
                        /* DPCM decompression */
                        0,
                },
                /* Output to both */
                {
                        /* No DPCM decompression */
                        CSI2_PIX_FMT_RAW8_VP,
                        /* DPCM decompression */
                        0,
                },
        },
        /* YUV422 formats */
        {
                /* Output to memory */
                {
                        /* No DPCM decompression */
                        CSI2_PIX_FMT_YUV422_8BIT,
                        /* DPCM decompression */
                        0,
                },
                /* Output to both */
                {
                        /* No DPCM decompression */
                        CSI2_PIX_FMT_YUV422_8BIT_VP16,
                        /* DPCM decompression */
                        0,
                },
        },
};

/*
 * csi2_ctx_map_format - Map CSI2 sink media bus format to CSI2 format ID
 * @csi2: ISS CSI2 device
 *
 * Returns CSI2 physical format id
 */
static u16 csi2_ctx_map_format(struct iss_csi2_device *csi2)
{
        const struct v4l2_mbus_framefmt *fmt = &csi2->formats[CSI2_PAD_SINK];
        int fmtidx, destidx;

        switch (fmt->code) {
        case MEDIA_BUS_FMT_SGRBG10_1X10:
        case MEDIA_BUS_FMT_SRGGB10_1X10:
        case MEDIA_BUS_FMT_SBGGR10_1X10:
        case MEDIA_BUS_FMT_SGBRG10_1X10:
                fmtidx = 0;
                break;
        case MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8:
        case MEDIA_BUS_FMT_SRGGB10_DPCM8_1X8:
        case MEDIA_BUS_FMT_SBGGR10_DPCM8_1X8:
        case MEDIA_BUS_FMT_SGBRG10_DPCM8_1X8:
                fmtidx = 1;
                break;
        case MEDIA_BUS_FMT_SBGGR8_1X8:
        case MEDIA_BUS_FMT_SGBRG8_1X8:
        case MEDIA_BUS_FMT_SGRBG8_1X8:
        case MEDIA_BUS_FMT_SRGGB8_1X8:
                fmtidx = 2;
                break;
        case MEDIA_BUS_FMT_UYVY8_1X16:
        case MEDIA_BUS_FMT_YUYV8_1X16:
                fmtidx = 3;
                break;
        default:
                WARN(1, "CSI2: pixel format %08x unsupported!\n",
                     fmt->code);
                return 0;
        }

        if (!(csi2->output & CSI2_OUTPUT_IPIPEIF) &&
            !(csi2->output & CSI2_OUTPUT_MEMORY)) {
                /* Neither output enabled is a valid combination */
                return CSI2_PIX_FMT_OTHERS;
        }

        /* If we need to skip frames at the beginning of the stream disable the
         * video port to avoid sending the skipped frames to the IPIPEIF.
         */
        destidx = csi2->frame_skip ? 0 : !!(csi2->output & CSI2_OUTPUT_IPIPEIF);

        return __csi2_fmt_map[fmtidx][destidx][csi2->dpcm_decompress];
}

/*
 * csi2_set_outaddr - Set memory address to save output image
 * @csi2: Pointer to ISS CSI2a device.
 * @addr: 32-bit memory address aligned on 32 byte boundary.
 *
 * Sets the memory address where the output will be saved.
 *
 * Returns 0 if successful, or -EINVAL if the address is not in the 32 byte
 * boundary.
 */
static void csi2_set_outaddr(struct iss_csi2_device *csi2, u32 addr)
{
        struct iss_csi2_ctx_cfg *ctx = &csi2->contexts[0];

        ctx->ping_addr = addr;
        ctx->pong_addr = addr;
        iss_reg_write(csi2->iss, csi2->regs1, CSI2_CTX_PING_ADDR(ctx->ctxnum),
                      ctx->ping_addr);
        iss_reg_write(csi2->iss, csi2->regs1, CSI2_CTX_PONG_ADDR(ctx->ctxnum),
                      ctx->pong_addr);
}

/*
 * is_usr_def_mapping - Checks whether USER_DEF_MAPPING should
 *                      be enabled by CSI2.
 * @format_id: mapped format id
 *
 */
static inline int is_usr_def_mapping(u32 format_id)
{
        return (format_id & 0xf0) == 0x40 ? 1 : 0;
}

/*
 * csi2_ctx_enable - Enable specified CSI2 context
 * @ctxnum: Context number, valid between 0 and 7 values.
 * @enable: enable
 *
 */
static void csi2_ctx_enable(struct iss_csi2_device *csi2, u8 ctxnum, u8 enable)
{
        struct iss_csi2_ctx_cfg *ctx = &csi2->contexts[ctxnum];
        u32 reg;

        reg = iss_reg_read(csi2->iss, csi2->regs1, CSI2_CTX_CTRL1(ctxnum));

        if (enable) {
                unsigned int skip = 0;

                if (csi2->frame_skip)
                        skip = csi2->frame_skip;
                else if (csi2->output & CSI2_OUTPUT_MEMORY)
                        skip = 1;

                reg &= ~CSI2_CTX_CTRL1_COUNT_MASK;
                reg |= CSI2_CTX_CTRL1_COUNT_UNLOCK
                    |  (skip << CSI2_CTX_CTRL1_COUNT_SHIFT)
                    |  CSI2_CTX_CTRL1_CTX_EN;
        } else {
                reg &= ~CSI2_CTX_CTRL1_CTX_EN;
        }

        iss_reg_write(csi2->iss, csi2->regs1, CSI2_CTX_CTRL1(ctxnum), reg);
        ctx->enabled = enable;
}

/*
 * csi2_ctx_config - CSI2 context configuration.
 * @ctx: context configuration
 *
 */
static void csi2_ctx_config(struct iss_csi2_device *csi2,
                            struct iss_csi2_ctx_cfg *ctx)
{
        u32 reg = 0;

        ctx->frame = 0;

        /* Set up CSI2_CTx_CTRL1 */
        if (ctx->eof_enabled)
                reg = CSI2_CTX_CTRL1_EOF_EN;

        if (ctx->eol_enabled)
                reg |= CSI2_CTX_CTRL1_EOL_EN;

        if (ctx->checksum_enabled)
                reg |= CSI2_CTX_CTRL1_CS_EN;

        iss_reg_write(csi2->iss, csi2->regs1, CSI2_CTX_CTRL1(ctx->ctxnum), reg);

        /* Set up CSI2_CTx_CTRL2 */
        reg = ctx->virtual_id << CSI2_CTX_CTRL2_VIRTUAL_ID_SHIFT;
        reg |= ctx->format_id << CSI2_CTX_CTRL2_FORMAT_SHIFT;

        if (ctx->dpcm_decompress && ctx->dpcm_predictor)
                reg |= CSI2_CTX_CTRL2_DPCM_PRED;

        if (is_usr_def_mapping(ctx->format_id))
                reg |= 2 << CSI2_CTX_CTRL2_USER_DEF_MAP_SHIFT;

        iss_reg_write(csi2->iss, csi2->regs1, CSI2_CTX_CTRL2(ctx->ctxnum), reg);

        /* Set up CSI2_CTx_CTRL3 */
        iss_reg_write(csi2->iss, csi2->regs1, CSI2_CTX_CTRL3(ctx->ctxnum),
                      ctx->alpha << CSI2_CTX_CTRL3_ALPHA_SHIFT);

        /* Set up CSI2_CTx_DAT_OFST */
        iss_reg_update(csi2->iss, csi2->regs1, CSI2_CTX_DAT_OFST(ctx->ctxnum),
                       CSI2_CTX_DAT_OFST_MASK, ctx->data_offset);

        iss_reg_write(csi2->iss, csi2->regs1, CSI2_CTX_PING_ADDR(ctx->ctxnum),
                      ctx->ping_addr);
        iss_reg_write(csi2->iss, csi2->regs1, CSI2_CTX_PONG_ADDR(ctx->ctxnum),
                      ctx->pong_addr);
}

/*
 * csi2_timing_config - CSI2 timing configuration.
 * @timing: csi2_timing_cfg structure
 */
static void csi2_timing_config(struct iss_csi2_device *csi2,
                               struct iss_csi2_timing_cfg *timing)
{
        u32 reg;

        reg = iss_reg_read(csi2->iss, csi2->regs1, CSI2_TIMING);

        if (timing->force_rx_mode)
                reg |= CSI2_TIMING_FORCE_RX_MODE_IO1;
        else
                reg &= ~CSI2_TIMING_FORCE_RX_MODE_IO1;

        if (timing->stop_state_16x)
                reg |= CSI2_TIMING_STOP_STATE_X16_IO1;
        else
                reg &= ~CSI2_TIMING_STOP_STATE_X16_IO1;

        if (timing->stop_state_4x)
                reg |= CSI2_TIMING_STOP_STATE_X4_IO1;
        else
                reg &= ~CSI2_TIMING_STOP_STATE_X4_IO1;

        reg &= ~CSI2_TIMING_STOP_STATE_COUNTER_IO1_MASK;
        reg |= timing->stop_state_counter <<
               CSI2_TIMING_STOP_STATE_COUNTER_IO1_SHIFT;

        iss_reg_write(csi2->iss, csi2->regs1, CSI2_TIMING, reg);
}

/*
 * csi2_irq_ctx_set - Enables CSI2 Context IRQs.
 * @enable: Enable/disable CSI2 Context interrupts
 */
static void csi2_irq_ctx_set(struct iss_csi2_device *csi2, int enable)
{
        const u32 mask = CSI2_CTX_IRQ_FE | CSI2_CTX_IRQ_FS;
        int i;

        for (i = 0; i < 8; i++) {
                iss_reg_write(csi2->iss, csi2->regs1, CSI2_CTX_IRQSTATUS(i),
                              mask);
                if (enable)
                        iss_reg_set(csi2->iss, csi2->regs1,
                                    CSI2_CTX_IRQENABLE(i), mask);
                else
                        iss_reg_clr(csi2->iss, csi2->regs1,
                                    CSI2_CTX_IRQENABLE(i), mask);
        }
}

/*
 * csi2_irq_complexio1_set - Enables CSI2 ComplexIO IRQs.
 * @enable: Enable/disable CSI2 ComplexIO #1 interrupts
 */
static void csi2_irq_complexio1_set(struct iss_csi2_device *csi2, int enable)
{
        u32 reg;

        reg = CSI2_COMPLEXIO_IRQ_STATEALLULPMEXIT |
                CSI2_COMPLEXIO_IRQ_STATEALLULPMENTER |
                CSI2_COMPLEXIO_IRQ_STATEULPM5 |
                CSI2_COMPLEXIO_IRQ_ERRCONTROL5 |
                CSI2_COMPLEXIO_IRQ_ERRESC5 |
                CSI2_COMPLEXIO_IRQ_ERRSOTSYNCHS5 |
                CSI2_COMPLEXIO_IRQ_ERRSOTHS5 |
                CSI2_COMPLEXIO_IRQ_STATEULPM4 |
                CSI2_COMPLEXIO_IRQ_ERRCONTROL4 |
                CSI2_COMPLEXIO_IRQ_ERRESC4 |
                CSI2_COMPLEXIO_IRQ_ERRSOTSYNCHS4 |
                CSI2_COMPLEXIO_IRQ_ERRSOTHS4 |
                CSI2_COMPLEXIO_IRQ_STATEULPM3 |
                CSI2_COMPLEXIO_IRQ_ERRCONTROL3 |
                CSI2_COMPLEXIO_IRQ_ERRESC3 |
                CSI2_COMPLEXIO_IRQ_ERRSOTSYNCHS3 |
                CSI2_COMPLEXIO_IRQ_ERRSOTHS3 |
                CSI2_COMPLEXIO_IRQ_STATEULPM2 |
                CSI2_COMPLEXIO_IRQ_ERRCONTROL2 |
                CSI2_COMPLEXIO_IRQ_ERRESC2 |
                CSI2_COMPLEXIO_IRQ_ERRSOTSYNCHS2 |
                CSI2_COMPLEXIO_IRQ_ERRSOTHS2 |
                CSI2_COMPLEXIO_IRQ_STATEULPM1 |
                CSI2_COMPLEXIO_IRQ_ERRCONTROL1 |
                CSI2_COMPLEXIO_IRQ_ERRESC1 |
                CSI2_COMPLEXIO_IRQ_ERRSOTSYNCHS1 |
                CSI2_COMPLEXIO_IRQ_ERRSOTHS1;
        iss_reg_write(csi2->iss, csi2->regs1, CSI2_COMPLEXIO_IRQSTATUS, reg);
        if (enable)
                iss_reg_set(csi2->iss, csi2->regs1, CSI2_COMPLEXIO_IRQENABLE,
                            reg);
        else
                iss_reg_write(csi2->iss, csi2->regs1, CSI2_COMPLEXIO_IRQENABLE,
                              0);
}

/*
 * csi2_irq_status_set - Enables CSI2 Status IRQs.
 * @enable: Enable/disable CSI2 Status interrupts
 */
static void csi2_irq_status_set(struct iss_csi2_device *csi2, int enable)
{
        u32 reg;

        reg = CSI2_IRQ_OCP_ERR |
                CSI2_IRQ_SHORT_PACKET |
                CSI2_IRQ_ECC_CORRECTION |
                CSI2_IRQ_ECC_NO_CORRECTION |
                CSI2_IRQ_COMPLEXIO_ERR |
                CSI2_IRQ_FIFO_OVF |
                CSI2_IRQ_CONTEXT0;
        iss_reg_write(csi2->iss, csi2->regs1, CSI2_IRQSTATUS, reg);
        if (enable)
                iss_reg_set(csi2->iss, csi2->regs1, CSI2_IRQENABLE, reg);
        else
                iss_reg_write(csi2->iss, csi2->regs1, CSI2_IRQENABLE, 0);
}

/*
 * omap4iss_csi2_reset - Resets the CSI2 module.
 *
 * Must be called with the phy lock held.
 *
 * Returns 0 if successful, or -EBUSY if power command didn't respond.
 */
int omap4iss_csi2_reset(struct iss_csi2_device *csi2)
{
        unsigned int timeout;

        if (!csi2->available)
                return -ENODEV;

        if (csi2->phy->phy_in_use)
                return -EBUSY;

        iss_reg_set(csi2->iss, csi2->regs1, CSI2_SYSCONFIG,
                    CSI2_SYSCONFIG_SOFT_RESET);

        timeout = iss_poll_condition_timeout(
                iss_reg_read(csi2->iss, csi2->regs1, CSI2_SYSSTATUS) &
                CSI2_SYSSTATUS_RESET_DONE, 500, 100, 200);
        if (timeout) {
                dev_err(csi2->iss->dev, "CSI2: Soft reset timeout!\n");
                return -EBUSY;
        }

        iss_reg_set(csi2->iss, csi2->regs1, CSI2_COMPLEXIO_CFG,
                    CSI2_COMPLEXIO_CFG_RESET_CTRL);

        timeout = iss_poll_condition_timeout(
                iss_reg_read(csi2->iss, csi2->phy->phy_regs, REGISTER1) &
                REGISTER1_RESET_DONE_CTRLCLK, 10000, 100, 500);
        if (timeout) {
                dev_err(csi2->iss->dev, "CSI2: CSI2_96M_FCLK reset timeout!\n");
                return -EBUSY;
        }

        iss_reg_update(csi2->iss, csi2->regs1, CSI2_SYSCONFIG,
                       CSI2_SYSCONFIG_MSTANDBY_MODE_MASK |
                       CSI2_SYSCONFIG_AUTO_IDLE,
                       CSI2_SYSCONFIG_MSTANDBY_MODE_NO);

        return 0;
}

static int csi2_configure(struct iss_csi2_device *csi2)
{
        const struct iss_v4l2_subdevs_group *pdata;
        struct iss_csi2_timing_cfg *timing = &csi2->timing[0];
        struct v4l2_subdev *sensor;
        struct media_pad *pad;

        /*
         * CSI2 fields that can be updated while the context has
         * been enabled or the interface has been enabled are not
         * updated dynamically currently. So we do not allow to
         * reconfigure if either has been enabled
         */
        if (csi2->contexts[0].enabled || csi2->ctrl.if_enable)
                return -EBUSY;

        pad = media_entity_remote_pad(&csi2->pads[CSI2_PAD_SINK]);
        sensor = media_entity_to_v4l2_subdev(pad->entity);
        pdata = sensor->host_priv;

        csi2->frame_skip = 0;
        v4l2_subdev_call(sensor, sensor, g_skip_frames, &csi2->frame_skip);

        csi2->ctrl.vp_out_ctrl = pdata->bus.csi2.vpclk_div;
        csi2->ctrl.frame_mode = ISS_CSI2_FRAME_IMMEDIATE;
        csi2->ctrl.ecc_enable = pdata->bus.csi2.crc;

        timing->force_rx_mode = 1;
        timing->stop_state_16x = 1;
        timing->stop_state_4x = 1;
        timing->stop_state_counter = 0x1ff;

        /*
         * The CSI2 receiver can't do any format conversion except DPCM
         * decompression, so every set_format call configures both pads
         * and enables DPCM decompression as a special case:
         */
        if (csi2->formats[CSI2_PAD_SINK].code !=
            csi2->formats[CSI2_PAD_SOURCE].code)
                csi2->dpcm_decompress = true;
        else
                csi2->dpcm_decompress = false;

        csi2->contexts[0].format_id = csi2_ctx_map_format(csi2);

        if (csi2->video_out.bpl_padding == 0)
                csi2->contexts[0].data_offset = 0;
        else
                csi2->contexts[0].data_offset = csi2->video_out.bpl_value;

        /*
         * Enable end of frame and end of line signals generation for
         * context 0. These signals are generated from CSI2 receiver to
         * qualify the last pixel of a frame and the last pixel of a line.
         * Without enabling the signals CSI2 receiver writes data to memory
         * beyond buffer size and/or data line offset is not handled correctly.
         */
        csi2->contexts[0].eof_enabled = 1;
        csi2->contexts[0].eol_enabled = 1;

        csi2_irq_complexio1_set(csi2, 1);
        csi2_irq_ctx_set(csi2, 1);
        csi2_irq_status_set(csi2, 1);

        /* Set configuration (timings, format and links) */
        csi2_timing_config(csi2, timing);
        csi2_recv_config(csi2, &csi2->ctrl);
        csi2_ctx_config(csi2, &csi2->contexts[0]);

        return 0;
}

/*
 * csi2_print_status - Prints CSI2 debug information.
 */
#define CSI2_PRINT_REGISTER(iss, regs, name)\
        dev_dbg(iss->dev, "###CSI2 " #name "=0x%08x\n", \
                iss_reg_read(iss, regs, CSI2_##name))

static void csi2_print_status(struct iss_csi2_device *csi2)
{
        struct iss_device *iss = csi2->iss;

        if (!csi2->available)
                return;

        dev_dbg(iss->dev, "-------------CSI2 Register dump-------------\n");

        CSI2_PRINT_REGISTER(iss, csi2->regs1, SYSCONFIG);
        CSI2_PRINT_REGISTER(iss, csi2->regs1, SYSSTATUS);
        CSI2_PRINT_REGISTER(iss, csi2->regs1, IRQENABLE);
        CSI2_PRINT_REGISTER(iss, csi2->regs1, IRQSTATUS);
        CSI2_PRINT_REGISTER(iss, csi2->regs1, CTRL);
        CSI2_PRINT_REGISTER(iss, csi2->regs1, DBG_H);
        CSI2_PRINT_REGISTER(iss, csi2->regs1, COMPLEXIO_CFG);
        CSI2_PRINT_REGISTER(iss, csi2->regs1, COMPLEXIO_IRQSTATUS);
        CSI2_PRINT_REGISTER(iss, csi2->regs1, SHORT_PACKET);
        CSI2_PRINT_REGISTER(iss, csi2->regs1, COMPLEXIO_IRQENABLE);
        CSI2_PRINT_REGISTER(iss, csi2->regs1, DBG_P);
        CSI2_PRINT_REGISTER(iss, csi2->regs1, TIMING);
        CSI2_PRINT_REGISTER(iss, csi2->regs1, CTX_CTRL1(0));
        CSI2_PRINT_REGISTER(iss, csi2->regs1, CTX_CTRL2(0));
        CSI2_PRINT_REGISTER(iss, csi2->regs1, CTX_DAT_OFST(0));
        CSI2_PRINT_REGISTER(iss, csi2->regs1, CTX_PING_ADDR(0));
        CSI2_PRINT_REGISTER(iss, csi2->regs1, CTX_PONG_ADDR(0));
        CSI2_PRINT_REGISTER(iss, csi2->regs1, CTX_IRQENABLE(0));
        CSI2_PRINT_REGISTER(iss, csi2->regs1, CTX_IRQSTATUS(0));
        CSI2_PRINT_REGISTER(iss, csi2->regs1, CTX_CTRL3(0));

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

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

/*
 * csi2_isr_buffer - Does buffer handling at end-of-frame
 * when writing to memory.
 */
static void csi2_isr_buffer(struct iss_csi2_device *csi2)
{
        struct iss_buffer *buffer;

        csi2_ctx_enable(csi2, 0, 0);

        buffer = omap4iss_video_buffer_next(&csi2->video_out);

        /*
         * Let video queue operation restart engine if there is an underrun
         * condition.
         */
        if (!buffer)
                return;

        csi2_set_outaddr(csi2, buffer->iss_addr);
        csi2_ctx_enable(csi2, 0, 1);
}

static void csi2_isr_ctx(struct iss_csi2_device *csi2,
                         struct iss_csi2_ctx_cfg *ctx)
{
        unsigned int n = ctx->ctxnum;
        u32 status;

        status = iss_reg_read(csi2->iss, csi2->regs1, CSI2_CTX_IRQSTATUS(n));
        iss_reg_write(csi2->iss, csi2->regs1, CSI2_CTX_IRQSTATUS(n), status);

        if (omap4iss_module_sync_is_stopping(&csi2->wait, &csi2->stopping))
                return;

        /* Propagate frame number */
        if (status & CSI2_CTX_IRQ_FS) {
                struct iss_pipeline *pipe =
                                     to_iss_pipeline(&csi2->subdev.entity);
                u16 frame;
                u16 delta;

                frame = iss_reg_read(csi2->iss, csi2->regs1,
                                     CSI2_CTX_CTRL2(ctx->ctxnum))
                      >> CSI2_CTX_CTRL2_FRAME_SHIFT;

                if (frame == 0) {
                        /* A zero value means that the counter isn't implemented
                         * by the source. Increment the frame number in software
                         * in that case.
                         */
                        atomic_inc(&pipe->frame_number);
                } else {
                        /* Extend the 16 bit frame number to 32 bits by
                         * computing the delta between two consecutive CSI2
                         * frame numbers and adding it to the software frame
                         * number. The hardware counter starts at 1 and wraps
                         * from 0xffff to 1 without going through 0, so subtract
                         * 1 when the counter wraps.
                         */
                        delta = frame - ctx->frame;
                        if (frame < ctx->frame)
                                delta--;
                        ctx->frame = frame;

                        atomic_add(delta, &pipe->frame_number);
                }
        }

        if (!(status & CSI2_CTX_IRQ_FE))
                return;

        /* Skip interrupts until we reach the frame skip count. The CSI2 will be
         * automatically disabled, as the frame skip count has been programmed
         * in the CSI2_CTx_CTRL1::COUNT field, so re-enable it.
         *
         * It would have been nice to rely on the FRAME_NUMBER interrupt instead
         * but it turned out that the interrupt is only generated when the CSI2
         * writes to memory (the CSI2_CTx_CTRL1::COUNT field is decreased
         * correctly and reaches 0 when data is forwarded to the video port only
         * but no interrupt arrives). Maybe a CSI2 hardware bug.
         */
        if (csi2->frame_skip) {
                csi2->frame_skip--;
                if (csi2->frame_skip == 0) {
                        ctx->format_id = csi2_ctx_map_format(csi2);
                        csi2_ctx_config(csi2, ctx);
                        csi2_ctx_enable(csi2, n, 1);
                }
                return;
        }

        if (csi2->output & CSI2_OUTPUT_MEMORY)
                csi2_isr_buffer(csi2);
}

/*
 * omap4iss_csi2_isr - CSI2 interrupt handling.
 */
void omap4iss_csi2_isr(struct iss_csi2_device *csi2)
{
        struct iss_pipeline *pipe = to_iss_pipeline(&csi2->subdev.entity);
        u32 csi2_irqstatus, cpxio1_irqstatus;
        struct iss_device *iss = csi2->iss;

        if (!csi2->available)
                return;

        csi2_irqstatus = iss_reg_read(csi2->iss, csi2->regs1, CSI2_IRQSTATUS);
        iss_reg_write(csi2->iss, csi2->regs1, CSI2_IRQSTATUS, csi2_irqstatus);

        /* Failure Cases */
        if (csi2_irqstatus & CSI2_IRQ_COMPLEXIO_ERR) {
                cpxio1_irqstatus = iss_reg_read(csi2->iss, csi2->regs1,
                                                CSI2_COMPLEXIO_IRQSTATUS);
                iss_reg_write(csi2->iss, csi2->regs1, CSI2_COMPLEXIO_IRQSTATUS,
                              cpxio1_irqstatus);
                dev_dbg(iss->dev, "CSI2: ComplexIO Error IRQ %x\n",
                        cpxio1_irqstatus);
                pipe->error = true;
        }

        if (csi2_irqstatus & (CSI2_IRQ_OCP_ERR |
                              CSI2_IRQ_SHORT_PACKET |
                              CSI2_IRQ_ECC_NO_CORRECTION |
                              CSI2_IRQ_COMPLEXIO_ERR |
                              CSI2_IRQ_FIFO_OVF)) {
                dev_dbg(iss->dev,
                        "CSI2 Err: OCP:%d SHORT:%d ECC:%d CPXIO:%d OVF:%d\n",
                        csi2_irqstatus & CSI2_IRQ_OCP_ERR ? 1 : 0,
                        csi2_irqstatus & CSI2_IRQ_SHORT_PACKET ? 1 : 0,
                        csi2_irqstatus & CSI2_IRQ_ECC_NO_CORRECTION ? 1 : 0,
                        csi2_irqstatus & CSI2_IRQ_COMPLEXIO_ERR ? 1 : 0,
                        csi2_irqstatus & CSI2_IRQ_FIFO_OVF ? 1 : 0);
                pipe->error = true;
        }

        /* Successful cases */
        if (csi2_irqstatus & CSI2_IRQ_CONTEXT0)
                csi2_isr_ctx(csi2, &csi2->contexts[0]);

        if (csi2_irqstatus & CSI2_IRQ_ECC_CORRECTION)
                dev_dbg(iss->dev, "CSI2: ECC correction done\n");
}

/* -----------------------------------------------------------------------------
 * ISS video operations
 */

/*
 * csi2_queue - Queues the first buffer when using memory output
 * @video: The video node
 * @buffer: buffer to queue
 */
static int csi2_queue(struct iss_video *video, struct iss_buffer *buffer)
{
        struct iss_csi2_device *csi2 = container_of(video,
                                struct iss_csi2_device, video_out);

        csi2_set_outaddr(csi2, buffer->iss_addr);

        /*
         * If streaming was enabled before there was a buffer queued
         * or underrun happened in the ISR, the hardware was not enabled
         * and DMA queue flag ISS_VIDEO_DMAQUEUE_UNDERRUN is still set.
         * Enable it now.
         */
        if (csi2->video_out.dmaqueue_flags & ISS_VIDEO_DMAQUEUE_UNDERRUN) {
                /* Enable / disable context 0 and IRQs */
                csi2_if_enable(csi2, 1);
                csi2_ctx_enable(csi2, 0, 1);
                iss_video_dmaqueue_flags_clr(&csi2->video_out);
        }

        return 0;
}

static const struct iss_video_operations csi2_issvideo_ops = {
        .queue = csi2_queue,
};

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

static struct v4l2_mbus_framefmt *
__csi2_get_format(struct iss_csi2_device *csi2,
                  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(&csi2->subdev, cfg, pad);

        return &csi2->formats[pad];
}

static void
csi2_try_format(struct iss_csi2_device *csi2,
                struct v4l2_subdev_pad_config *cfg,
                unsigned int pad,
                struct v4l2_mbus_framefmt *fmt,
                enum v4l2_subdev_format_whence which)
{
        u32 pixelcode;
        struct v4l2_mbus_framefmt *format;
        const struct iss_format_info *info;
        unsigned int i;

        switch (pad) {
        case CSI2_PAD_SINK:
                /* Clamp the width and height to valid range (1-8191). */
                for (i = 0; i < ARRAY_SIZE(csi2_input_fmts); i++) {
                        if (fmt->code == csi2_input_fmts[i])
                                break;
                }

                /* If not found, use SGRBG10 as default */
                if (i >= ARRAY_SIZE(csi2_input_fmts))
                        fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;

                fmt->width = clamp_t(u32, fmt->width, 1, 8191);
                fmt->height = clamp_t(u32, fmt->height, 1, 8191);
                break;

        case CSI2_PAD_SOURCE:
                /* Source format same as sink format, except for DPCM
                 * compression.
                 */
                pixelcode = fmt->code;
                format = __csi2_get_format(csi2, cfg, CSI2_PAD_SINK, which);
                memcpy(fmt, format, sizeof(*fmt));

                /*
                 * Only Allow DPCM decompression, and check that the
                 * pattern is preserved
                 */
                info = omap4iss_video_format_info(fmt->code);
                if (info->uncompressed == pixelcode)
                        fmt->code = pixelcode;
                break;
        }

        /* RGB, non-interlaced */
        fmt->colorspace = V4L2_COLORSPACE_SRGB;
        fmt->field = V4L2_FIELD_NONE;
}

/*
 * csi2_enum_mbus_code - Handle pixel format enumeration
 * @sd     : pointer to v4l2 subdev structure
 * @cfg    : V4L2 subdev pad config
 * @code   : pointer to v4l2_subdev_mbus_code_enum structure
 * return -EINVAL or zero on success
 */
static int csi2_enum_mbus_code(struct v4l2_subdev *sd,
                               struct v4l2_subdev_pad_config *cfg,
                               struct v4l2_subdev_mbus_code_enum *code)
{
        struct iss_csi2_device *csi2 = v4l2_get_subdevdata(sd);
        struct v4l2_mbus_framefmt *format;
        const struct iss_format_info *info;

        if (code->pad == CSI2_PAD_SINK) {
                if (code->index >= ARRAY_SIZE(csi2_input_fmts))
                        return -EINVAL;

                code->code = csi2_input_fmts[code->index];
        } else {
                format = __csi2_get_format(csi2, cfg, CSI2_PAD_SINK,
                                           code->which);
                switch (code->index) {
                case 0:
                        /* Passthrough sink pad code */
                        code->code = format->code;
                        break;
                case 1:
                        /* Uncompressed code */
                        info = omap4iss_video_format_info(format->code);
                        if (info->uncompressed == format->code)
                                return -EINVAL;

                        code->code = info->uncompressed;
                        break;
                default:
                        return -EINVAL;
                }
        }

        return 0;
}

static int csi2_enum_frame_size(struct v4l2_subdev *sd,
                                struct v4l2_subdev_pad_config *cfg,
                                struct v4l2_subdev_frame_size_enum *fse)
{
        struct iss_csi2_device *csi2 = 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;
        csi2_try_format(csi2, 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;
        csi2_try_format(csi2, cfg, fse->pad, &format, fse->which);
        fse->max_width = format.width;
        fse->max_height = format.height;

        return 0;
}

/*
 * csi2_get_format - Handle get format by pads subdev method
 * @sd : pointer to v4l2 subdev structure
 * @cfg: V4L2 subdev pad config
 * @fmt: pointer to v4l2 subdev format structure
 * return -EINVAL or zero on success
 */
static int csi2_get_format(struct v4l2_subdev *sd,
                           struct v4l2_subdev_pad_config *cfg,
                           struct v4l2_subdev_format *fmt)
{
        struct iss_csi2_device *csi2 = v4l2_get_subdevdata(sd);
        struct v4l2_mbus_framefmt *format;

        format = __csi2_get_format(csi2, cfg, fmt->pad, fmt->which);
        if (!format)
                return -EINVAL;

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

/*
 * csi2_set_format - Handle set format by pads subdev method
 * @sd : pointer to v4l2 subdev structure
 * @cfg: V4L2 subdev pad config
 * @fmt: pointer to v4l2 subdev format structure
 * return -EINVAL or zero on success
 */
static int csi2_set_format(struct v4l2_subdev *sd,
                           struct v4l2_subdev_pad_config *cfg,
                           struct v4l2_subdev_format *fmt)
{
        struct iss_csi2_device *csi2 = v4l2_get_subdevdata(sd);
        struct v4l2_mbus_framefmt *format;

        format = __csi2_get_format(csi2, cfg, fmt->pad, fmt->which);
        if (!format)

                return -EINVAL;

        csi2_try_format(csi2, cfg, fmt->pad, &fmt->format, fmt->which);
        *format = fmt->format;

        /* Propagate the format from sink to source */
        if (fmt->pad == CSI2_PAD_SINK) {
                format = __csi2_get_format(csi2, cfg, CSI2_PAD_SOURCE,
                                           fmt->which);
                *format = fmt->format;
                csi2_try_format(csi2, cfg, CSI2_PAD_SOURCE, format, fmt->which);
        }

        return 0;
}

static int csi2_link_validate(struct v4l2_subdev *sd, struct media_link *link,
                              struct v4l2_subdev_format *source_fmt,
                              struct v4l2_subdev_format *sink_fmt)
{
        struct iss_csi2_device *csi2 = v4l2_get_subdevdata(sd);
        struct iss_pipeline *pipe = to_iss_pipeline(&csi2->subdev.entity);
        int rval;

        pipe->external = media_entity_to_v4l2_subdev(link->source->entity);
        rval = omap4iss_get_external_info(pipe, link);
        if (rval < 0)
                return rval;

        return v4l2_subdev_link_validate_default(sd, link, source_fmt,
                                                 sink_fmt);
}

/*
 * csi2_init_formats - Initialize formats on all pads
 * @sd: ISS CSI2 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 csi2_init_formats(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
        struct v4l2_subdev_format format;

        memset(&format, 0, sizeof(format));
        format.pad = CSI2_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;
        csi2_set_format(sd, fh ? fh->pad : NULL, &format);

        return 0;
}

/*
 * csi2_set_stream - Enable/Disable streaming on the CSI2 module
 * @sd: ISS CSI2 V4L2 subdevice
 * @enable: ISS pipeline stream state
 *
 * Return 0 on success or a negative error code otherwise.
 */
static int csi2_set_stream(struct v4l2_subdev *sd, int enable)
{
        struct iss_csi2_device *csi2 = v4l2_get_subdevdata(sd);
        struct iss_device *iss = csi2->iss;
        struct iss_video *video_out = &csi2->video_out;
        int ret = 0;

        if (csi2->state == ISS_PIPELINE_STREAM_STOPPED) {
                if (enable == ISS_PIPELINE_STREAM_STOPPED)
                        return 0;

                omap4iss_subclk_enable(iss, csi2->subclk);
        }

        switch (enable) {
        case ISS_PIPELINE_STREAM_CONTINUOUS: {
                ret = omap4iss_csiphy_config(iss, sd);
                if (ret < 0)
                        return ret;

                if (omap4iss_csiphy_acquire(csi2->phy) < 0)
                        return -ENODEV;
                csi2_configure(csi2);
                csi2_print_status(csi2);

                /*
                 * When outputting to memory with no buffer available, let the
                 * buffer queue handler start the hardware. A DMA queue flag
                 * ISS_VIDEO_DMAQUEUE_QUEUED will be set as soon as there is
                 * a buffer available.
                 */
                if (csi2->output & CSI2_OUTPUT_MEMORY &&
                    !(video_out->dmaqueue_flags & ISS_VIDEO_DMAQUEUE_QUEUED))
                        break;
                /* Enable context 0 and IRQs */
                atomic_set(&csi2->stopping, 0);
                csi2_ctx_enable(csi2, 0, 1);
                csi2_if_enable(csi2, 1);
                iss_video_dmaqueue_flags_clr(video_out);
                break;
        }
        case ISS_PIPELINE_STREAM_STOPPED:
                if (csi2->state == ISS_PIPELINE_STREAM_STOPPED)
                        return 0;
                if (omap4iss_module_sync_idle(&sd->entity, &csi2->wait,
                                              &csi2->stopping))
                        ret = -ETIMEDOUT;
                csi2_ctx_enable(csi2, 0, 0);
                csi2_if_enable(csi2, 0);
                csi2_irq_ctx_set(csi2, 0);
                omap4iss_csiphy_release(csi2->phy);
                omap4iss_subclk_disable(iss, csi2->subclk);
                iss_video_dmaqueue_flags_clr(video_out);
                break;
        }

        csi2->state = enable;
        return ret;
}

/* subdev video operations */
static const struct v4l2_subdev_video_ops csi2_video_ops = {
        .s_stream = csi2_set_stream,
};

/* subdev pad operations */
static const struct v4l2_subdev_pad_ops csi2_pad_ops = {
        .enum_mbus_code = csi2_enum_mbus_code,
        .enum_frame_size = csi2_enum_frame_size,
        .get_fmt = csi2_get_format,
        .set_fmt = csi2_set_format,
        .link_validate = csi2_link_validate,
};

/* subdev operations */
static const struct v4l2_subdev_ops csi2_ops = {
        .video = &csi2_video_ops,
        .pad = &csi2_pad_ops,
};

/* subdev internal operations */
static const struct v4l2_subdev_internal_ops csi2_internal_ops = {
        .open = csi2_init_formats,
};

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

/*
 * csi2_link_setup - Setup CSI2 connections.
 * @entity : Pointer to media entity structure
 * @local  : Pointer to local pad array
 * @remote : Pointer to remote pad array
 * @flags  : Link flags
 * return -EINVAL or zero on success
 */
static int csi2_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 iss_csi2_device *csi2 = v4l2_get_subdevdata(sd);
        struct iss_csi2_ctrl_cfg *ctrl = &csi2->ctrl;
        unsigned int index = local->index;

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

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

        switch (index) {
        case CSI2_PAD_SOURCE:
                if (flags & MEDIA_LNK_FL_ENABLED) {
                        if (csi2->output & ~CSI2_OUTPUT_MEMORY)
                                return -EBUSY;
                        csi2->output |= CSI2_OUTPUT_MEMORY;
                } else {
                        csi2->output &= ~CSI2_OUTPUT_MEMORY;
                }
                break;

        case CSI2_PAD_SOURCE | 2 << 16:
                if (flags & MEDIA_LNK_FL_ENABLED) {
                        if (csi2->output & ~CSI2_OUTPUT_IPIPEIF)
                                return -EBUSY;
                        csi2->output |= CSI2_OUTPUT_IPIPEIF;
                } else {
                        csi2->output &= ~CSI2_OUTPUT_IPIPEIF;
                }
                break;

        default:
                /* Link from camera to CSI2 is fixed... */
                return -EINVAL;
        }

        ctrl->vp_only_enable = csi2->output & CSI2_OUTPUT_MEMORY ? false : true;
        ctrl->vp_clk_enable = !!(csi2->output & CSI2_OUTPUT_IPIPEIF);

        return 0;
}

/* media operations */
static const struct media_entity_operations csi2_media_ops = {
        .link_setup = csi2_link_setup,
        .link_validate = v4l2_subdev_link_validate,
};

void omap4iss_csi2_unregister_entities(struct iss_csi2_device *csi2)
{
        v4l2_device_unregister_subdev(&csi2->subdev);
        omap4iss_video_unregister(&csi2->video_out);
}

int omap4iss_csi2_register_entities(struct iss_csi2_device *csi2,
                                    struct v4l2_device *vdev)
{
        int ret;

        /* Register the subdev and video nodes. */
        ret = v4l2_device_register_subdev(vdev, &csi2->subdev);
        if (ret < 0)
                goto error;

        ret = omap4iss_video_register(&csi2->video_out, vdev);
        if (ret < 0)
                goto error;

        return 0;

error:
        omap4iss_csi2_unregister_entities(csi2);
        return ret;
}

/* -----------------------------------------------------------------------------
 * ISS CSI2 initialisation and cleanup
 */

/*
 * csi2_init_entities - Initialize subdev and media entity.
 * @csi2: Pointer to csi2 structure.
 * return -ENOMEM or zero on success
 */
static int csi2_init_entities(struct iss_csi2_device *csi2, const char *subname)
{
        struct v4l2_subdev *sd = &csi2->subdev;
        struct media_pad *pads = csi2->pads;
        struct media_entity *me = &sd->entity;
        int ret;
        char name[V4L2_SUBDEV_NAME_SIZE];

        v4l2_subdev_init(sd, &csi2_ops);
        sd->internal_ops = &csi2_internal_ops;
        snprintf(name, sizeof(name), "CSI2%s", subname);
        snprintf(sd->name, sizeof(sd->name), "OMAP4 ISS %s", name);

        sd->grp_id = BIT(16);   /* group ID for iss subdevs */
        v4l2_set_subdevdata(sd, csi2);
        sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;

        pads[CSI2_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
        pads[CSI2_PAD_SINK].flags = MEDIA_PAD_FL_SINK;

        me->ops = &csi2_media_ops;
        ret = media_entity_pads_init(me, CSI2_PADS_NUM, pads);
        if (ret < 0)
                return ret;

        csi2_init_formats(sd, NULL);

        /* Video device node */
        csi2->video_out.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        csi2->video_out.ops = &csi2_issvideo_ops;
        csi2->video_out.bpl_alignment = 32;
        csi2->video_out.bpl_zero_padding = 1;
        csi2->video_out.bpl_max = 0x1ffe0;
        csi2->video_out.iss = csi2->iss;
        csi2->video_out.capture_mem = PAGE_ALIGN(4096 * 4096) * 3;

        ret = omap4iss_video_init(&csi2->video_out, name);
        if (ret < 0)
                goto error_video;

        return 0;

error_video:
        media_entity_cleanup(&csi2->subdev.entity);
        return ret;
}

/*
 * omap4iss_csi2_init - Routine for module driver init
 */
int omap4iss_csi2_init(struct iss_device *iss)
{
        struct iss_csi2_device *csi2a = &iss->csi2a;
        struct iss_csi2_device *csi2b = &iss->csi2b;
        int ret;

        csi2a->iss = iss;
        csi2a->available = 1;
        csi2a->regs1 = OMAP4_ISS_MEM_CSI2_A_REGS1;
        csi2a->phy = &iss->csiphy1;
        csi2a->subclk = OMAP4_ISS_SUBCLK_CSI2_A;
        csi2a->state = ISS_PIPELINE_STREAM_STOPPED;
        init_waitqueue_head(&csi2a->wait);

        ret = csi2_init_entities(csi2a, "a");
        if (ret < 0)
                return ret;

        csi2b->iss = iss;
        csi2b->available = 1;
        csi2b->regs1 = OMAP4_ISS_MEM_CSI2_B_REGS1;
        csi2b->phy = &iss->csiphy2;
        csi2b->subclk = OMAP4_ISS_SUBCLK_CSI2_B;
        csi2b->state = ISS_PIPELINE_STREAM_STOPPED;
        init_waitqueue_head(&csi2b->wait);

        ret = csi2_init_entities(csi2b, "b");
        if (ret < 0)
                return ret;

        return 0;
}

/*
 * omap4iss_csi2_create_links() - CSI2 pads links creation
 * @iss: Pointer to ISS device
 *
 * return negative error code or zero on success
 */
int omap4iss_csi2_create_links(struct iss_device *iss)
{
        struct iss_csi2_device *csi2a = &iss->csi2a;
        struct iss_csi2_device *csi2b = &iss->csi2b;
        int ret;

        /* Connect the CSI2a subdev to the video node. */
        ret = media_create_pad_link(&csi2a->subdev.entity, CSI2_PAD_SOURCE,
                                    &csi2a->video_out.video.entity, 0, 0);
        if (ret < 0)
                return ret;

        /* Connect the CSI2b subdev to the video node. */
        ret = media_create_pad_link(&csi2b->subdev.entity, CSI2_PAD_SOURCE,
                                    &csi2b->video_out.video.entity, 0, 0);
        if (ret < 0)
                return ret;

        return 0;
}

/*
 * omap4iss_csi2_cleanup - Routine for module driver cleanup
 */
void omap4iss_csi2_cleanup(struct iss_device *iss)
{
        struct iss_csi2_device *csi2a = &iss->csi2a;
        struct iss_csi2_device *csi2b = &iss->csi2b;

        omap4iss_video_cleanup(&csi2a->video_out);
        media_entity_cleanup(&csi2a->subdev.entity);

        omap4iss_video_cleanup(&csi2b->video_out);
        media_entity_cleanup(&csi2b->subdev.entity);
}