// SPDX-License-Identifier: GPL-2.0-only
/*
 * isp.c
 *
 * TI OMAP3 ISP - Core
 *
 * Copyright (C) 2006-2010 Nokia Corporation
 * Copyright (C) 2007-2009 Texas Instruments, Inc.
 *
 * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 *           Sakari Ailus <sakari.ailus@iki.fi>
 *
 * Contributors:
 *      Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 *      Sakari Ailus <sakari.ailus@iki.fi>
 *      David Cohen <dacohen@gmail.com>
 *      Stanimir Varbanov <svarbanov@mm-sol.com>
 *      Vimarsh Zutshi <vimarsh.zutshi@gmail.com>
 *      Tuukka Toivonen <tuukkat76@gmail.com>
 *      Sergio Aguirre <saaguirre@ti.com>
 *      Antti Koskipaa <akoskipa@gmail.com>
 *      Ivan T. Ivanov <iivanov@mm-sol.com>
 *      RaniSuneela <r-m@ti.com>
 *      Atanas Filipov <afilipov@mm-sol.com>
 *      Gjorgji Rosikopulos <grosikopulos@mm-sol.com>
 *      Hiroshi DOYU <hiroshi.doyu@nokia.com>
 *      Nayden Kanchev <nkanchev@mm-sol.com>
 *      Phil Carmody <ext-phil.2.carmody@nokia.com>
 *      Artem Bityutskiy <artem.bityutskiy@nokia.com>
 *      Dominic Curran <dcurran@ti.com>
 *      Ilkka Myllyperkio <ilkka.myllyperkio@sofica.fi>
 *      Pallavi Kulkarni <p-kulkarni@ti.com>
 *      Vaibhav Hiremath <hvaibhav@ti.com>
 *      Mohit Jalori <mjalori@ti.com>
 *      Sameer Venkatraman <sameerv@ti.com>
 *      Senthilvadivu Guruswamy <svadivu@ti.com>
 *      Thara Gopinath <thara@ti.com>
 *      Toni Leinonen <toni.leinonen@nokia.com>
 *      Troy Laramy <t-laramy@ti.com>
 */

#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/omap-iommu.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/vmalloc.h>

#ifdef CONFIG_ARM_DMA_USE_IOMMU
#include <asm/dma-iommu.h>
#endif

#include <media/v4l2-common.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-device.h>
#include <media/v4l2-mc.h>

#include "isp.h"
#include "ispreg.h"
#include "ispccdc.h"
#include "isppreview.h"
#include "ispresizer.h"
#include "ispcsi2.h"
#include "ispccp2.h"
#include "isph3a.h"
#include "isphist.h"

static unsigned int autoidle;
module_param(autoidle, int, 0444);
MODULE_PARM_DESC(autoidle, "Enable OMAP3ISP AUTOIDLE support");

static void isp_save_ctx(struct isp_device *isp);

static void isp_restore_ctx(struct isp_device *isp);

static const struct isp_res_mapping isp_res_maps[] = {
        {
                .isp_rev = ISP_REVISION_2_0,
                .offset = {
                        /* first MMIO area */
                        0x0000, /* base, len 0x0070 */
                        0x0400, /* ccp2, len 0x01f0 */
                        0x0600, /* ccdc, len 0x00a8 */
                        0x0a00, /* hist, len 0x0048 */
                        0x0c00, /* h3a, len 0x0060 */
                        0x0e00, /* preview, len 0x00a0 */
                        0x1000, /* resizer, len 0x00ac */
                        0x1200, /* sbl, len 0x00fc */
                        /* second MMIO area */
                        0x0000, /* csi2a, len 0x0170 */
                        0x0170, /* csiphy2, len 0x000c */
                },
                .phy_type = ISP_PHY_TYPE_3430,
        },
        {
                .isp_rev = ISP_REVISION_15_0,
                .offset = {
                        /* first MMIO area */
                        0x0000, /* base, len 0x0070 */
                        0x0400, /* ccp2, len 0x01f0 */
                        0x0600, /* ccdc, len 0x00a8 */
                        0x0a00, /* hist, len 0x0048 */
                        0x0c00, /* h3a, len 0x0060 */
                        0x0e00, /* preview, len 0x00a0 */
                        0x1000, /* resizer, len 0x00ac */
                        0x1200, /* sbl, len 0x00fc */
                        /* second MMIO area */
                        0x0000, /* csi2a, len 0x0170 (1st area) */
                        0x0170, /* csiphy2, len 0x000c */
                        0x01c0, /* csi2a, len 0x0040 (2nd area) */
                        0x0400, /* csi2c, len 0x0170 (1st area) */
                        0x0570, /* csiphy1, len 0x000c */
                        0x05c0, /* csi2c, len 0x0040 (2nd area) */
                },
                .phy_type = ISP_PHY_TYPE_3630,
        },
};

/* Structure for saving/restoring ISP module registers */
static struct isp_reg isp_reg_list[] = {
        {OMAP3_ISP_IOMEM_MAIN, ISP_SYSCONFIG, 0},
        {OMAP3_ISP_IOMEM_MAIN, ISP_CTRL, 0},
        {OMAP3_ISP_IOMEM_MAIN, ISP_TCTRL_CTRL, 0},
        {0, ISP_TOK_TERM, 0}
};

/*
 * omap3isp_flush - Post pending L3 bus writes by doing a register readback
 * @isp: OMAP3 ISP device
 *
 * In order to force posting of pending writes, we need to write and
 * readback the same register, in this case the revision register.
 *
 * See this link for reference:
 *   http://www.mail-archive.com/linux-omap@vger.kernel.org/msg08149.html
 */
void omap3isp_flush(struct isp_device *isp)
{
        isp_reg_writel(isp, 0, OMAP3_ISP_IOMEM_MAIN, ISP_REVISION);
        isp_reg_readl(isp, OMAP3_ISP_IOMEM_MAIN, ISP_REVISION);
}

/* -----------------------------------------------------------------------------
 * XCLK
 */

#define to_isp_xclk(_hw)        container_of(_hw, struct isp_xclk, hw)

static void isp_xclk_update(struct isp_xclk *xclk, u32 divider)
{
        switch (xclk->id) {
        case ISP_XCLK_A:
                isp_reg_clr_set(xclk->isp, OMAP3_ISP_IOMEM_MAIN, ISP_TCTRL_CTRL,
                                ISPTCTRL_CTRL_DIVA_MASK,
                                divider << ISPTCTRL_CTRL_DIVA_SHIFT);
                break;
        case ISP_XCLK_B:
                isp_reg_clr_set(xclk->isp, OMAP3_ISP_IOMEM_MAIN, ISP_TCTRL_CTRL,
                                ISPTCTRL_CTRL_DIVB_MASK,
                                divider << ISPTCTRL_CTRL_DIVB_SHIFT);
                break;
        }
}

static int isp_xclk_prepare(struct clk_hw *hw)
{
        struct isp_xclk *xclk = to_isp_xclk(hw);

        omap3isp_get(xclk->isp);

        return 0;
}

static void isp_xclk_unprepare(struct clk_hw *hw)
{
        struct isp_xclk *xclk = to_isp_xclk(hw);

        omap3isp_put(xclk->isp);
}

static int isp_xclk_enable(struct clk_hw *hw)
{
        struct isp_xclk *xclk = to_isp_xclk(hw);
        unsigned long flags;

        spin_lock_irqsave(&xclk->lock, flags);
        isp_xclk_update(xclk, xclk->divider);
        xclk->enabled = true;
        spin_unlock_irqrestore(&xclk->lock, flags);

        return 0;
}

static void isp_xclk_disable(struct clk_hw *hw)
{
        struct isp_xclk *xclk = to_isp_xclk(hw);
        unsigned long flags;

        spin_lock_irqsave(&xclk->lock, flags);
        isp_xclk_update(xclk, 0);
        xclk->enabled = false;
        spin_unlock_irqrestore(&xclk->lock, flags);
}

static unsigned long isp_xclk_recalc_rate(struct clk_hw *hw,
                                          unsigned long parent_rate)
{
        struct isp_xclk *xclk = to_isp_xclk(hw);

        return parent_rate / xclk->divider;
}

static u32 isp_xclk_calc_divider(unsigned long *rate, unsigned long parent_rate)
{
        u32 divider;

        if (*rate >= parent_rate) {
                *rate = parent_rate;
                return ISPTCTRL_CTRL_DIV_BYPASS;
        }

        if (*rate == 0)
                *rate = 1;

        divider = DIV_ROUND_CLOSEST(parent_rate, *rate);
        if (divider >= ISPTCTRL_CTRL_DIV_BYPASS)
                divider = ISPTCTRL_CTRL_DIV_BYPASS - 1;

        *rate = parent_rate / divider;
        return divider;
}

static long isp_xclk_round_rate(struct clk_hw *hw, unsigned long rate,
                                unsigned long *parent_rate)
{
        isp_xclk_calc_divider(&rate, *parent_rate);
        return rate;
}

static int isp_xclk_set_rate(struct clk_hw *hw, unsigned long rate,
                             unsigned long parent_rate)
{
        struct isp_xclk *xclk = to_isp_xclk(hw);
        unsigned long flags;
        u32 divider;

        divider = isp_xclk_calc_divider(&rate, parent_rate);

        spin_lock_irqsave(&xclk->lock, flags);

        xclk->divider = divider;
        if (xclk->enabled)
                isp_xclk_update(xclk, divider);

        spin_unlock_irqrestore(&xclk->lock, flags);

        dev_dbg(xclk->isp->dev, "%s: cam_xclk%c set to %lu Hz (div %u)\n",
                __func__, xclk->id == ISP_XCLK_A ? 'a' : 'b', rate, divider);
        return 0;
}

static const struct clk_ops isp_xclk_ops = {
        .prepare = isp_xclk_prepare,
        .unprepare = isp_xclk_unprepare,
        .enable = isp_xclk_enable,
        .disable = isp_xclk_disable,
        .recalc_rate = isp_xclk_recalc_rate,
        .round_rate = isp_xclk_round_rate,
        .set_rate = isp_xclk_set_rate,
};

static const char *isp_xclk_parent_name = "cam_mclk";

static struct clk *isp_xclk_src_get(struct of_phandle_args *clkspec, void *data)
{
        unsigned int idx = clkspec->args[0];
        struct isp_device *isp = data;

        if (idx >= ARRAY_SIZE(isp->xclks))
                return ERR_PTR(-ENOENT);

        return isp->xclks[idx].clk;
}

static int isp_xclk_init(struct isp_device *isp)
{
        struct device_node *np = isp->dev->of_node;
        struct clk_init_data init = {};
        unsigned int i;

        for (i = 0; i < ARRAY_SIZE(isp->xclks); ++i)
                isp->xclks[i].clk = ERR_PTR(-EINVAL);

        for (i = 0; i < ARRAY_SIZE(isp->xclks); ++i) {
                struct isp_xclk *xclk = &isp->xclks[i];

                xclk->isp = isp;
                xclk->id = i == 0 ? ISP_XCLK_A : ISP_XCLK_B;
                xclk->divider = 1;
                spin_lock_init(&xclk->lock);

                init.name = i == 0 ? "cam_xclka" : "cam_xclkb";
                init.ops = &isp_xclk_ops;
                init.parent_names = &isp_xclk_parent_name;
                init.num_parents = 1;

                xclk->hw.init = &init;
                /*
                 * The first argument is NULL in order to avoid circular
                 * reference, as this driver takes reference on the
                 * sensor subdevice modules and the sensors would take
                 * reference on this module through clk_get().
                 */
                xclk->clk = clk_register(NULL, &xclk->hw);
                if (IS_ERR(xclk->clk))
                        return PTR_ERR(xclk->clk);
        }

        if (np)
                of_clk_add_provider(np, isp_xclk_src_get, isp);

        return 0;
}

static void isp_xclk_cleanup(struct isp_device *isp)
{
        struct device_node *np = isp->dev->of_node;
        unsigned int i;

        if (np)
                of_clk_del_provider(np);

        for (i = 0; i < ARRAY_SIZE(isp->xclks); ++i) {
                struct isp_xclk *xclk = &isp->xclks[i];

                if (!IS_ERR(xclk->clk))
                        clk_unregister(xclk->clk);
        }
}

/* -----------------------------------------------------------------------------
 * Interrupts
 */

/*
 * isp_enable_interrupts - Enable ISP interrupts.
 * @isp: OMAP3 ISP device
 */
static void isp_enable_interrupts(struct isp_device *isp)
{
        static const u32 irq = IRQ0ENABLE_CSIA_IRQ
                             | IRQ0ENABLE_CSIB_IRQ
                             | IRQ0ENABLE_CCDC_LSC_PREF_ERR_IRQ
                             | IRQ0ENABLE_CCDC_LSC_DONE_IRQ
                             | IRQ0ENABLE_CCDC_VD0_IRQ
                             | IRQ0ENABLE_CCDC_VD1_IRQ
                             | IRQ0ENABLE_HS_VS_IRQ
                             | IRQ0ENABLE_HIST_DONE_IRQ
                             | IRQ0ENABLE_H3A_AWB_DONE_IRQ
                             | IRQ0ENABLE_H3A_AF_DONE_IRQ
                             | IRQ0ENABLE_PRV_DONE_IRQ
                             | IRQ0ENABLE_RSZ_DONE_IRQ;

        isp_reg_writel(isp, irq, OMAP3_ISP_IOMEM_MAIN, ISP_IRQ0STATUS);
        isp_reg_writel(isp, irq, OMAP3_ISP_IOMEM_MAIN, ISP_IRQ0ENABLE);
}

/*
 * isp_disable_interrupts - Disable ISP interrupts.
 * @isp: OMAP3 ISP device
 */
static void isp_disable_interrupts(struct isp_device *isp)
{
        isp_reg_writel(isp, 0, OMAP3_ISP_IOMEM_MAIN, ISP_IRQ0ENABLE);
}

/*
 * isp_core_init - ISP core settings
 * @isp: OMAP3 ISP device
 * @idle: Consider idle state.
 *
 * Set the power settings for the ISP and SBL bus and configure the HS/VS
 * interrupt source.
 *
 * We need to configure the HS/VS interrupt source before interrupts get
 * enabled, as the sensor might be free-running and the ISP default setting
 * (HS edge) would put an unnecessary burden on the CPU.
 */
static void isp_core_init(struct isp_device *isp, int idle)
{
        isp_reg_writel(isp,
                       ((idle ? ISP_SYSCONFIG_MIDLEMODE_SMARTSTANDBY :
                                ISP_SYSCONFIG_MIDLEMODE_FORCESTANDBY) <<
                        ISP_SYSCONFIG_MIDLEMODE_SHIFT) |
                        ((isp->revision == ISP_REVISION_15_0) ?
                          ISP_SYSCONFIG_AUTOIDLE : 0),
                       OMAP3_ISP_IOMEM_MAIN, ISP_SYSCONFIG);

        isp_reg_writel(isp,
                       (isp->autoidle ? ISPCTRL_SBL_AUTOIDLE : 0) |
                       ISPCTRL_SYNC_DETECT_VSRISE,
                       OMAP3_ISP_IOMEM_MAIN, ISP_CTRL);
}

/*
 * Configure the bridge and lane shifter. Valid inputs are
 *
 * CCDC_INPUT_PARALLEL: Parallel interface
 * CCDC_INPUT_CSI2A: CSI2a receiver
 * CCDC_INPUT_CCP2B: CCP2b receiver
 * CCDC_INPUT_CSI2C: CSI2c receiver
 *
 * The bridge and lane shifter are configured according to the selected input
 * and the ISP platform data.
 */
void omap3isp_configure_bridge(struct isp_device *isp,
                               enum ccdc_input_entity input,
                               const struct isp_parallel_cfg *parcfg,
                               unsigned int shift, unsigned int bridge)
{
        u32 ispctrl_val;

        ispctrl_val  = isp_reg_readl(isp, OMAP3_ISP_IOMEM_MAIN, ISP_CTRL);
        ispctrl_val &= ~ISPCTRL_SHIFT_MASK;
        ispctrl_val &= ~ISPCTRL_PAR_CLK_POL_INV;
        ispctrl_val &= ~ISPCTRL_PAR_SER_CLK_SEL_MASK;
        ispctrl_val &= ~ISPCTRL_PAR_BRIDGE_MASK;
        ispctrl_val |= bridge;

        switch (input) {
        case CCDC_INPUT_PARALLEL:
                ispctrl_val |= ISPCTRL_PAR_SER_CLK_SEL_PARALLEL;
                ispctrl_val |= parcfg->clk_pol << ISPCTRL_PAR_CLK_POL_SHIFT;
                shift += parcfg->data_lane_shift;
                break;

        case CCDC_INPUT_CSI2A:
                ispctrl_val |= ISPCTRL_PAR_SER_CLK_SEL_CSIA;
                break;

        case CCDC_INPUT_CCP2B:
                ispctrl_val |= ISPCTRL_PAR_SER_CLK_SEL_CSIB;
                break;

        case CCDC_INPUT_CSI2C:
                ispctrl_val |= ISPCTRL_PAR_SER_CLK_SEL_CSIC;
                break;

        default:
                return;
        }

        ispctrl_val |= ((shift/2) << ISPCTRL_SHIFT_SHIFT) & ISPCTRL_SHIFT_MASK;

        isp_reg_writel(isp, ispctrl_val, OMAP3_ISP_IOMEM_MAIN, ISP_CTRL);
}

void omap3isp_hist_dma_done(struct isp_device *isp)
{
        if (omap3isp_ccdc_busy(&isp->isp_ccdc) ||
            omap3isp_stat_pcr_busy(&isp->isp_hist)) {
                /* Histogram cannot be enabled in this frame anymore */
                atomic_set(&isp->isp_hist.buf_err, 1);
                dev_dbg(isp->dev,
                        "hist: Out of synchronization with CCDC. Ignoring next buffer.\n");
        }
}

static inline void isp_isr_dbg(struct isp_device *isp, u32 irqstatus)
{
        static const char *name[] = {
                "CSIA_IRQ",
                "res1",
                "res2",
                "CSIB_LCM_IRQ",
                "CSIB_IRQ",
                "res5",
                "res6",
                "res7",
                "CCDC_VD0_IRQ",
                "CCDC_VD1_IRQ",
                "CCDC_VD2_IRQ",
                "CCDC_ERR_IRQ",
                "H3A_AF_DONE_IRQ",
                "H3A_AWB_DONE_IRQ",
                "res14",
                "res15",
                "HIST_DONE_IRQ",
                "CCDC_LSC_DONE",
                "CCDC_LSC_PREFETCH_COMPLETED",
                "CCDC_LSC_PREFETCH_ERROR",
                "PRV_DONE_IRQ",
                "CBUFF_IRQ",
                "res22",
                "res23",
                "RSZ_DONE_IRQ",
                "OVF_IRQ",
                "res26",
                "res27",
                "MMU_ERR_IRQ",
                "OCP_ERR_IRQ",
                "SEC_ERR_IRQ",
                "HS_VS_IRQ",
        };
        int i;

        dev_dbg(isp->dev, "ISP IRQ: ");

        for (i = 0; i < ARRAY_SIZE(name); i++) {
                if ((1 << i) & irqstatus)
                        printk(KERN_CONT "%s ", name[i]);
        }
        printk(KERN_CONT "\n");
}

static void isp_isr_sbl(struct isp_device *isp)
{
        struct device *dev = isp->dev;
        struct isp_pipeline *pipe;
        u32 sbl_pcr;

        /*
         * Handle shared buffer logic overflows for video buffers.
         * ISPSBL_PCR_CCDCPRV_2_RSZ_OVF can be safely ignored.
         */
        sbl_pcr = isp_reg_readl(isp, OMAP3_ISP_IOMEM_SBL, ISPSBL_PCR);
        isp_reg_writel(isp, sbl_pcr, OMAP3_ISP_IOMEM_SBL, ISPSBL_PCR);
        sbl_pcr &= ~ISPSBL_PCR_CCDCPRV_2_RSZ_OVF;

        if (sbl_pcr)
                dev_dbg(dev, "SBL overflow (PCR = 0x%08x)\n", sbl_pcr);

        if (sbl_pcr & ISPSBL_PCR_CSIB_WBL_OVF) {
                pipe = to_isp_pipeline(&isp->isp_ccp2.subdev.entity);
                if (pipe != NULL)
                        pipe->error = true;
        }

        if (sbl_pcr & ISPSBL_PCR_CSIA_WBL_OVF) {
                pipe = to_isp_pipeline(&isp->isp_csi2a.subdev.entity);
                if (pipe != NULL)
                        pipe->error = true;
        }

        if (sbl_pcr & ISPSBL_PCR_CCDC_WBL_OVF) {
                pipe = to_isp_pipeline(&isp->isp_ccdc.subdev.entity);
                if (pipe != NULL)
                        pipe->error = true;
        }

        if (sbl_pcr & ISPSBL_PCR_PRV_WBL_OVF) {
                pipe = to_isp_pipeline(&isp->isp_prev.subdev.entity);
                if (pipe != NULL)
                        pipe->error = true;
        }

        if (sbl_pcr & (ISPSBL_PCR_RSZ1_WBL_OVF
                       | ISPSBL_PCR_RSZ2_WBL_OVF
                       | ISPSBL_PCR_RSZ3_WBL_OVF
                       | ISPSBL_PCR_RSZ4_WBL_OVF)) {
                pipe = to_isp_pipeline(&isp->isp_res.subdev.entity);
                if (pipe != NULL)
                        pipe->error = true;
        }

        if (sbl_pcr & ISPSBL_PCR_H3A_AF_WBL_OVF)
                omap3isp_stat_sbl_overflow(&isp->isp_af);

        if (sbl_pcr & ISPSBL_PCR_H3A_AEAWB_WBL_OVF)
                omap3isp_stat_sbl_overflow(&isp->isp_aewb);
}

/*
 * isp_isr - Interrupt Service Routine for Camera ISP module.
 * @irq: Not used currently.
 * @_isp: Pointer to the OMAP3 ISP device
 *
 * Handles the corresponding callback if plugged in.
 */
static irqreturn_t isp_isr(int irq, void *_isp)
{
        static const u32 ccdc_events = IRQ0STATUS_CCDC_LSC_PREF_ERR_IRQ |
                                       IRQ0STATUS_CCDC_LSC_DONE_IRQ |
                                       IRQ0STATUS_CCDC_VD0_IRQ |
                                       IRQ0STATUS_CCDC_VD1_IRQ |
                                       IRQ0STATUS_HS_VS_IRQ;
        struct isp_device *isp = _isp;
        u32 irqstatus;

        irqstatus = isp_reg_readl(isp, OMAP3_ISP_IOMEM_MAIN, ISP_IRQ0STATUS);
        isp_reg_writel(isp, irqstatus, OMAP3_ISP_IOMEM_MAIN, ISP_IRQ0STATUS);

        isp_isr_sbl(isp);

        if (irqstatus & IRQ0STATUS_CSIA_IRQ)
                omap3isp_csi2_isr(&isp->isp_csi2a);

        if (irqstatus & IRQ0STATUS_CSIB_IRQ)
                omap3isp_ccp2_isr(&isp->isp_ccp2);

        if (irqstatus & IRQ0STATUS_CCDC_VD0_IRQ) {
                if (isp->isp_ccdc.output & CCDC_OUTPUT_PREVIEW)
                        omap3isp_preview_isr_frame_sync(&isp->isp_prev);
                if (isp->isp_ccdc.output & CCDC_OUTPUT_RESIZER)
                        omap3isp_resizer_isr_frame_sync(&isp->isp_res);
                omap3isp_stat_isr_frame_sync(&isp->isp_aewb);
                omap3isp_stat_isr_frame_sync(&isp->isp_af);
                omap3isp_stat_isr_frame_sync(&isp->isp_hist);
        }

        if (irqstatus & ccdc_events)
                omap3isp_ccdc_isr(&isp->isp_ccdc, irqstatus & ccdc_events);

        if (irqstatus & IRQ0STATUS_PRV_DONE_IRQ) {
                if (isp->isp_prev.output & PREVIEW_OUTPUT_RESIZER)
                        omap3isp_resizer_isr_frame_sync(&isp->isp_res);
                omap3isp_preview_isr(&isp->isp_prev);
        }

        if (irqstatus & IRQ0STATUS_RSZ_DONE_IRQ)
                omap3isp_resizer_isr(&isp->isp_res);

        if (irqstatus & IRQ0STATUS_H3A_AWB_DONE_IRQ)
                omap3isp_stat_isr(&isp->isp_aewb);

        if (irqstatus & IRQ0STATUS_H3A_AF_DONE_IRQ)
                omap3isp_stat_isr(&isp->isp_af);

        if (irqstatus & IRQ0STATUS_HIST_DONE_IRQ)
                omap3isp_stat_isr(&isp->isp_hist);

        omap3isp_flush(isp);

#if defined(DEBUG) && defined(ISP_ISR_DEBUG)
        isp_isr_dbg(isp, irqstatus);
#endif

        return IRQ_HANDLED;
}

static const struct media_device_ops isp_media_ops = {
        .link_notify = v4l2_pipeline_link_notify,
};

/* -----------------------------------------------------------------------------
 * Pipeline stream management
 */

/*
 * isp_pipeline_enable - Enable streaming on a pipeline
 * @pipe: ISP pipeline
 * @mode: Stream mode (single shot or continuous)
 *
 * Walk the entities chain starting at the pipeline output video node and start
 * all modules in the chain in the given mode.
 *
 * Return 0 if successful, or the return value of the failed video::s_stream
 * operation otherwise.
 */
static int isp_pipeline_enable(struct isp_pipeline *pipe,
                               enum isp_pipeline_stream_state mode)
{
        struct isp_device *isp = pipe->output->isp;
        struct media_entity *entity;
        struct media_pad *pad;
        struct v4l2_subdev *subdev;
        unsigned long flags;
        int ret;

        /* Refuse to start streaming if an entity included in the pipeline has
         * crashed. This check must be performed before the loop below to avoid
         * starting entities if the pipeline won't start anyway (those entities
         * would then likely fail to stop, making the problem worse).
         */
        if (media_entity_enum_intersects(&pipe->ent_enum, &isp->crashed))
                return -EIO;

        spin_lock_irqsave(&pipe->lock, flags);
        pipe->state &= ~(ISP_PIPELINE_IDLE_INPUT | ISP_PIPELINE_IDLE_OUTPUT);
        spin_unlock_irqrestore(&pipe->lock, flags);

        pipe->do_propagation = false;

        entity = &pipe->output->video.entity;
        while (1) {
                pad = &entity->pads[0];
                if (!(pad->flags & MEDIA_PAD_FL_SINK))
                        break;

                pad = media_entity_remote_pad(pad);
                if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
                        break;

                entity = pad->entity;
                subdev = media_entity_to_v4l2_subdev(entity);

                ret = v4l2_subdev_call(subdev, video, s_stream, mode);
                if (ret < 0 && ret != -ENOIOCTLCMD)
                        return ret;

                if (subdev == &isp->isp_ccdc.subdev) {
                        v4l2_subdev_call(&isp->isp_aewb.subdev, video,
                                        s_stream, mode);
                        v4l2_subdev_call(&isp->isp_af.subdev, video,
                                        s_stream, mode);
                        v4l2_subdev_call(&isp->isp_hist.subdev, video,
                                        s_stream, mode);
                        pipe->do_propagation = true;
                }

                /* Stop at the first external sub-device. */
                if (subdev->dev != isp->dev)
                        break;
        }

        return 0;
}

static int isp_pipeline_wait_resizer(struct isp_device *isp)
{
        return omap3isp_resizer_busy(&isp->isp_res);
}

static int isp_pipeline_wait_preview(struct isp_device *isp)
{
        return omap3isp_preview_busy(&isp->isp_prev);
}

static int isp_pipeline_wait_ccdc(struct isp_device *isp)
{
        return omap3isp_stat_busy(&isp->isp_af)
            || omap3isp_stat_busy(&isp->isp_aewb)
            || omap3isp_stat_busy(&isp->isp_hist)
            || omap3isp_ccdc_busy(&isp->isp_ccdc);
}

#define ISP_STOP_TIMEOUT        msecs_to_jiffies(1000)

static int isp_pipeline_wait(struct isp_device *isp,
                             int(*busy)(struct isp_device *isp))
{
        unsigned long timeout = jiffies + ISP_STOP_TIMEOUT;

        while (!time_after(jiffies, timeout)) {
                if (!busy(isp))
                        return 0;
        }

        return 1;
}

/*
 * isp_pipeline_disable - Disable streaming on a pipeline
 * @pipe: ISP pipeline
 *
 * Walk the entities chain starting at the pipeline output video node and stop
 * all modules in the chain. Wait synchronously for the modules to be stopped if
 * necessary.
 *
 * Return 0 if all modules have been properly stopped, or -ETIMEDOUT if a module
 * can't be stopped (in which case a software reset of the ISP is probably
 * necessary).
 */
static int isp_pipeline_disable(struct isp_pipeline *pipe)
{
        struct isp_device *isp = pipe->output->isp;
        struct media_entity *entity;
        struct media_pad *pad;
        struct v4l2_subdev *subdev;
        int failure = 0;
        int ret;

        /*
         * We need to stop all the modules after CCDC first or they'll
         * never stop since they may not get a full frame from CCDC.
         */
        entity = &pipe->output->video.entity;
        while (1) {
                pad = &entity->pads[0];
                if (!(pad->flags & MEDIA_PAD_FL_SINK))
                        break;

                pad = media_entity_remote_pad(pad);
                if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
                        break;

                entity = pad->entity;
                subdev = media_entity_to_v4l2_subdev(entity);

                if (subdev == &isp->isp_ccdc.subdev) {
                        v4l2_subdev_call(&isp->isp_aewb.subdev,
                                         video, s_stream, 0);
                        v4l2_subdev_call(&isp->isp_af.subdev,
                                         video, s_stream, 0);
                        v4l2_subdev_call(&isp->isp_hist.subdev,
                                         video, s_stream, 0);
                }

                ret = v4l2_subdev_call(subdev, video, s_stream, 0);

                /* Stop at the first external sub-device. */
                if (subdev->dev != isp->dev)
                        break;

                if (subdev == &isp->isp_res.subdev)
                        ret |= isp_pipeline_wait(isp, isp_pipeline_wait_resizer);
                else if (subdev == &isp->isp_prev.subdev)
                        ret |= isp_pipeline_wait(isp, isp_pipeline_wait_preview);
                else if (subdev == &isp->isp_ccdc.subdev)
                        ret |= isp_pipeline_wait(isp, isp_pipeline_wait_ccdc);

                /* Handle stop failures. An entity that fails to stop can
                 * usually just be restarted. Flag the stop failure nonetheless
                 * to trigger an ISP reset the next time the device is released,
                 * just in case.
                 *
                 * The preview engine is a special case. A failure to stop can
                 * mean a hardware crash. When that happens the preview engine
                 * won't respond to read/write operations on the L4 bus anymore,
                 * resulting in a bus fault and a kernel oops next time it gets
                 * accessed. Mark it as crashed to prevent pipelines including
                 * it from being started.
                 */
                if (ret) {
                        dev_info(isp->dev, "Unable to stop %s\n", subdev->name);
                        isp->stop_failure = true;
                        if (subdev == &isp->isp_prev.subdev)
                                media_entity_enum_set(&isp->crashed,
                                                      &subdev->entity);
                        failure = -ETIMEDOUT;
                }
        }

        return failure;
}

/*
 * omap3isp_pipeline_set_stream - Enable/disable streaming on a pipeline
 * @pipe: ISP pipeline
 * @state: Stream state (stopped, single shot or continuous)
 *
 * Set the pipeline to the given stream state. Pipelines can be started in
 * single-shot or continuous mode.
 *
 * Return 0 if successful, or the return value of the failed video::s_stream
 * operation otherwise. The pipeline state is not updated when the operation
 * fails, except when stopping the pipeline.
 */
int omap3isp_pipeline_set_stream(struct isp_pipeline *pipe,
                                 enum isp_pipeline_stream_state state)
{
        int ret;

        if (state == ISP_PIPELINE_STREAM_STOPPED)
                ret = isp_pipeline_disable(pipe);
        else
                ret = isp_pipeline_enable(pipe, state);

        if (ret == 0 || state == ISP_PIPELINE_STREAM_STOPPED)
                pipe->stream_state = state;

        return ret;
}

/*
 * omap3isp_pipeline_cancel_stream - Cancel stream on a pipeline
 * @pipe: ISP pipeline
 *
 * Cancelling a stream mark all buffers on all video nodes in the pipeline as
 * erroneous and makes sure no new buffer can be queued. This function is called
 * when a fatal error that prevents any further operation on the pipeline
 * occurs.
 */
void omap3isp_pipeline_cancel_stream(struct isp_pipeline *pipe)
{
        if (pipe->input)
                omap3isp_video_cancel_stream(pipe->input);
        if (pipe->output)
                omap3isp_video_cancel_stream(pipe->output);
}

/*
 * isp_pipeline_resume - Resume streaming on a pipeline
 * @pipe: ISP pipeline
 *
 * Resume video output and input and re-enable pipeline.
 */
static void isp_pipeline_resume(struct isp_pipeline *pipe)
{
        int singleshot = pipe->stream_state == ISP_PIPELINE_STREAM_SINGLESHOT;

        omap3isp_video_resume(pipe->output, !singleshot);
        if (singleshot)
                omap3isp_video_resume(pipe->input, 0);
        isp_pipeline_enable(pipe, pipe->stream_state);
}

/*
 * isp_pipeline_suspend - Suspend streaming on a pipeline
 * @pipe: ISP pipeline
 *
 * Suspend pipeline.
 */
static void isp_pipeline_suspend(struct isp_pipeline *pipe)
{
        isp_pipeline_disable(pipe);
}

/*
 * isp_pipeline_is_last - Verify if entity has an enabled link to the output
 *                        video node
 * @me: ISP module's media entity
 *
 * Returns 1 if the entity has an enabled link to the output video node or 0
 * otherwise. It's true only while pipeline can have no more than one output
 * node.
 */
static int isp_pipeline_is_last(struct media_entity *me)
{
        struct isp_pipeline *pipe;
        struct media_pad *pad;

        if (!me->pipe)
                return 0;
        pipe = to_isp_pipeline(me);
        if (pipe->stream_state == ISP_PIPELINE_STREAM_STOPPED)
                return 0;
        pad = media_entity_remote_pad(&pipe->output->pad);
        return pad->entity == me;
}

/*
 * isp_suspend_module_pipeline - Suspend pipeline to which belongs the module
 * @me: ISP module's media entity
 *
 * Suspend the whole pipeline if module's entity has an enabled link to the
 * output video node. It works only while pipeline can have no more than one
 * output node.
 */
static void isp_suspend_module_pipeline(struct media_entity *me)
{
        if (isp_pipeline_is_last(me))
                isp_pipeline_suspend(to_isp_pipeline(me));
}

/*
 * isp_resume_module_pipeline - Resume pipeline to which belongs the module
 * @me: ISP module's media entity
 *
 * Resume the whole pipeline if module's entity has an enabled link to the
 * output video node. It works only while pipeline can have no more than one
 * output node.
 */
static void isp_resume_module_pipeline(struct media_entity *me)
{
        if (isp_pipeline_is_last(me))
                isp_pipeline_resume(to_isp_pipeline(me));
}

/*
 * isp_suspend_modules - Suspend ISP submodules.
 * @isp: OMAP3 ISP device
 *
 * Returns 0 if suspend left in idle state all the submodules properly,
 * or returns 1 if a general Reset is required to suspend the submodules.
 */
static int __maybe_unused isp_suspend_modules(struct isp_device *isp)
{
        unsigned long timeout;

        omap3isp_stat_suspend(&isp->isp_aewb);
        omap3isp_stat_suspend(&isp->isp_af);
        omap3isp_stat_suspend(&isp->isp_hist);
        isp_suspend_module_pipeline(&isp->isp_res.subdev.entity);
        isp_suspend_module_pipeline(&isp->isp_prev.subdev.entity);
        isp_suspend_module_pipeline(&isp->isp_ccdc.subdev.entity);
        isp_suspend_module_pipeline(&isp->isp_csi2a.subdev.entity);
        isp_suspend_module_pipeline(&isp->isp_ccp2.subdev.entity);

        timeout = jiffies + ISP_STOP_TIMEOUT;
        while (omap3isp_stat_busy(&isp->isp_af)
            || omap3isp_stat_busy(&isp->isp_aewb)
            || omap3isp_stat_busy(&isp->isp_hist)
            || omap3isp_preview_busy(&isp->isp_prev)
            || omap3isp_resizer_busy(&isp->isp_res)
            || omap3isp_ccdc_busy(&isp->isp_ccdc)) {
                if (time_after(jiffies, timeout)) {
                        dev_info(isp->dev, "can't stop modules.\n");
                        return 1;
                }

                msleep(1);
        }

        return 0;
}

/*
 * isp_resume_modules - Resume ISP submodules.
 * @isp: OMAP3 ISP device
 */
static void __maybe_unused isp_resume_modules(struct isp_device *isp)
{
        omap3isp_stat_resume(&isp->isp_aewb);
        omap3isp_stat_resume(&isp->isp_af);
        omap3isp_stat_resume(&isp->isp_hist);
        isp_resume_module_pipeline(&isp->isp_res.subdev.entity);
        isp_resume_module_pipeline(&isp->isp_prev.subdev.entity);
        isp_resume_module_pipeline(&isp->isp_ccdc.subdev.entity);
        isp_resume_module_pipeline(&isp->isp_csi2a.subdev.entity);
        isp_resume_module_pipeline(&isp->isp_ccp2.subdev.entity);
}

/*
 * isp_reset - Reset ISP with a timeout wait for idle.
 * @isp: OMAP3 ISP device
 */
static int isp_reset(struct isp_device *isp)
{
        unsigned long timeout = 0;

        isp_reg_writel(isp,
                       isp_reg_readl(isp, OMAP3_ISP_IOMEM_MAIN, ISP_SYSCONFIG)
                       | ISP_SYSCONFIG_SOFTRESET,
                       OMAP3_ISP_IOMEM_MAIN, ISP_SYSCONFIG);
        while (!(isp_reg_readl(isp, OMAP3_ISP_IOMEM_MAIN,
                               ISP_SYSSTATUS) & 0x1)) {
                if (timeout++ > 10000) {
                        dev_alert(isp->dev, "cannot reset ISP\n");
                        return -ETIMEDOUT;
                }
                udelay(1);
        }

        isp->stop_failure = false;
        media_entity_enum_zero(&isp->crashed);
        return 0;
}

/*
 * isp_save_context - Saves the values of the ISP module registers.
 * @isp: OMAP3 ISP device
 * @reg_list: Structure containing pairs of register address and value to
 *            modify on OMAP.
 */
static void
isp_save_context(struct isp_device *isp, struct isp_reg *reg_list)
{
        struct isp_reg *next = reg_list;

        for (; next->reg != ISP_TOK_TERM; next++)
                next->val = isp_reg_readl(isp, next->mmio_range, next->reg);
}

/*
 * isp_restore_context - Restores the values of the ISP module registers.
 * @isp: OMAP3 ISP device
 * @reg_list: Structure containing pairs of register address and value to
 *            modify on OMAP.
 */
static void
isp_restore_context(struct isp_device *isp, struct isp_reg *reg_list)
{
        struct isp_reg *next = reg_list;

        for (; next->reg != ISP_TOK_TERM; next++)
                isp_reg_writel(isp, next->val, next->mmio_range, next->reg);
}

/*
 * isp_save_ctx - Saves ISP, CCDC, HIST, H3A, PREV, RESZ & MMU context.
 * @isp: OMAP3 ISP device
 *
 * Routine for saving the context of each module in the ISP.
 * CCDC, HIST, H3A, PREV, RESZ and MMU.
 */
static void isp_save_ctx(struct isp_device *isp)
{
        isp_save_context(isp, isp_reg_list);
        omap_iommu_save_ctx(isp->dev);
}

/*
 * isp_restore_ctx - Restores ISP, CCDC, HIST, H3A, PREV, RESZ & MMU context.
 * @isp: OMAP3 ISP device
 *
 * Routine for restoring the context of each module in the ISP.
 * CCDC, HIST, H3A, PREV, RESZ and MMU.
 */
static void isp_restore_ctx(struct isp_device *isp)
{
        isp_restore_context(isp, isp_reg_list);
        omap_iommu_restore_ctx(isp->dev);
        omap3isp_ccdc_restore_context(isp);
        omap3isp_preview_restore_context(isp);
}

/* -----------------------------------------------------------------------------
 * SBL resources management
 */
#define OMAP3_ISP_SBL_READ      (OMAP3_ISP_SBL_CSI1_READ | \
                                 OMAP3_ISP_SBL_CCDC_LSC_READ | \
                                 OMAP3_ISP_SBL_PREVIEW_READ | \
                                 OMAP3_ISP_SBL_RESIZER_READ)
#define OMAP3_ISP_SBL_WRITE     (OMAP3_ISP_SBL_CSI1_WRITE | \
                                 OMAP3_ISP_SBL_CSI2A_WRITE | \
                                 OMAP3_ISP_SBL_CSI2C_WRITE | \
                                 OMAP3_ISP_SBL_CCDC_WRITE | \
                                 OMAP3_ISP_SBL_PREVIEW_WRITE)

void omap3isp_sbl_enable(struct isp_device *isp, enum isp_sbl_resource res)
{
        u32 sbl = 0;

        isp->sbl_resources |= res;

        if (isp->sbl_resources & OMAP3_ISP_SBL_CSI1_READ)
                sbl |= ISPCTRL_SBL_SHARED_RPORTA;

        if (isp->sbl_resources & OMAP3_ISP_SBL_CCDC_LSC_READ)
                sbl |= ISPCTRL_SBL_SHARED_RPORTB;

        if (isp->sbl_resources & OMAP3_ISP_SBL_CSI2C_WRITE)
                sbl |= ISPCTRL_SBL_SHARED_WPORTC;

        if (isp->sbl_resources & OMAP3_ISP_SBL_RESIZER_WRITE)
                sbl |= ISPCTRL_SBL_WR0_RAM_EN;

        if (isp->sbl_resources & OMAP3_ISP_SBL_WRITE)
                sbl |= ISPCTRL_SBL_WR1_RAM_EN;

        if (isp->sbl_resources & OMAP3_ISP_SBL_READ)
                sbl |= ISPCTRL_SBL_RD_RAM_EN;

        isp_reg_set(isp, OMAP3_ISP_IOMEM_MAIN, ISP_CTRL, sbl);
}

void omap3isp_sbl_disable(struct isp_device *isp, enum isp_sbl_resource res)
{
        u32 sbl = 0;

        isp->sbl_resources &= ~res;

        if (!(isp->sbl_resources & OMAP3_ISP_SBL_CSI1_READ))
                sbl |= ISPCTRL_SBL_SHARED_RPORTA;

        if (!(isp->sbl_resources & OMAP3_ISP_SBL_CCDC_LSC_READ))
                sbl |= ISPCTRL_SBL_SHARED_RPORTB;

        if (!(isp->sbl_resources & OMAP3_ISP_SBL_CSI2C_WRITE))
                sbl |= ISPCTRL_SBL_SHARED_WPORTC;

        if (!(isp->sbl_resources & OMAP3_ISP_SBL_RESIZER_WRITE))
                sbl |= ISPCTRL_SBL_WR0_RAM_EN;

        if (!(isp->sbl_resources & OMAP3_ISP_SBL_WRITE))
                sbl |= ISPCTRL_SBL_WR1_RAM_EN;

        if (!(isp->sbl_resources & OMAP3_ISP_SBL_READ))
                sbl |= ISPCTRL_SBL_RD_RAM_EN;

        isp_reg_clr(isp, OMAP3_ISP_IOMEM_MAIN, ISP_CTRL, sbl);
}

/*
 * isp_module_sync_idle - Helper to sync module with its idle state
 * @me: ISP submodule's media entity
 * @wait: ISP submodule's wait queue for streamoff/interrupt synchronization
 * @stopping: flag which tells module wants to stop
 *
 * This function checks if ISP submodule needs to wait for next interrupt. If
 * yes, makes the caller to sleep while waiting for such event.
 */
int omap3isp_module_sync_idle(struct media_entity *me, wait_queue_head_t *wait,
                              atomic_t *stopping)
{
        struct isp_pipeline *pipe = to_isp_pipeline(me);

        if (pipe->stream_state == ISP_PIPELINE_STREAM_STOPPED ||
            (pipe->stream_state == ISP_PIPELINE_STREAM_SINGLESHOT &&
             !isp_pipeline_ready(pipe)))
                return 0;

        /*
         * atomic_set() doesn't include memory barrier on ARM platform for SMP
         * scenario. We'll call it here to avoid race conditions.
         */
        atomic_set(stopping, 1);
        smp_mb();

        /*
         * If module is the last one, it's writing to memory. In this case,
         * it's necessary to check if the module is already paused due to
         * DMA queue underrun or if it has to wait for next interrupt to be
         * idle.
         * If it isn't the last one, the function won't sleep but *stopping
         * will still be set to warn next submodule caller's interrupt the
         * module wants to be idle.
         */
        if (isp_pipeline_is_last(me)) {
                struct isp_video *video = pipe->output;
                unsigned long flags;
                spin_lock_irqsave(&video->irqlock, flags);
                if (video->dmaqueue_flags & ISP_VIDEO_DMAQUEUE_UNDERRUN) {
                        spin_unlock_irqrestore(&video->irqlock, flags);
                        atomic_set(stopping, 0);
                        smp_mb();
                        return 0;
                }
                spin_unlock_irqrestore(&video->irqlock, flags);
                if (!wait_event_timeout(*wait, !atomic_read(stopping),
                                        msecs_to_jiffies(1000))) {
                        atomic_set(stopping, 0);
                        smp_mb();
                        return -ETIMEDOUT;
                }
        }

        return 0;
}

/*
 * omap3isp_module_sync_is_stopping - Helper to verify if module was stopping
 * @wait: ISP submodule's wait queue for streamoff/interrupt synchronization
 * @stopping: flag which tells module wants to stop
 *
 * This function checks if ISP submodule was stopping. In case of yes, it
 * notices the caller by setting stopping to 0 and waking up the wait queue.
 * Returns 1 if it was stopping or 0 otherwise.
 */
int omap3isp_module_sync_is_stopping(wait_queue_head_t *wait,
                                     atomic_t *stopping)
{
        if (atomic_cmpxchg(stopping, 1, 0)) {
                wake_up(wait);
                return 1;
        }

        return 0;
}

/* --------------------------------------------------------------------------
 * Clock management
 */

#define ISPCTRL_CLKS_MASK       (ISPCTRL_H3A_CLK_EN | \
                                 ISPCTRL_HIST_CLK_EN | \
                                 ISPCTRL_RSZ_CLK_EN | \
                                 (ISPCTRL_CCDC_CLK_EN | ISPCTRL_CCDC_RAM_EN) | \
                                 (ISPCTRL_PREV_CLK_EN | ISPCTRL_PREV_RAM_EN))

static void __isp_subclk_update(struct isp_device *isp)
{
        u32 clk = 0;

        /* AEWB and AF share the same clock. */
        if (isp->subclk_resources &
            (OMAP3_ISP_SUBCLK_AEWB | OMAP3_ISP_SUBCLK_AF))
                clk |= ISPCTRL_H3A_CLK_EN;

        if (isp->subclk_resources & OMAP3_ISP_SUBCLK_HIST)
                clk |= ISPCTRL_HIST_CLK_EN;

        if (isp->subclk_resources & OMAP3_ISP_SUBCLK_RESIZER)
                clk |= ISPCTRL_RSZ_CLK_EN;

        /* NOTE: For CCDC & Preview submodules, we need to affect internal
         *       RAM as well.
         */
        if (isp->subclk_resources & OMAP3_ISP_SUBCLK_CCDC)
                clk |= ISPCTRL_CCDC_CLK_EN | ISPCTRL_CCDC_RAM_EN;

        if (isp->subclk_resources & OMAP3_ISP_SUBCLK_PREVIEW)
                clk |= ISPCTRL_PREV_CLK_EN | ISPCTRL_PREV_RAM_EN;

        isp_reg_clr_set(isp, OMAP3_ISP_IOMEM_MAIN, ISP_CTRL,
                        ISPCTRL_CLKS_MASK, clk);
}

void omap3isp_subclk_enable(struct isp_device *isp,
                            enum isp_subclk_resource res)
{
        isp->subclk_resources |= res;

        __isp_subclk_update(isp);
}

void omap3isp_subclk_disable(struct isp_device *isp,
                             enum isp_subclk_resource res)
{
        isp->subclk_resources &= ~res;

        __isp_subclk_update(isp);
}

/*
 * isp_enable_clocks - Enable ISP clocks
 * @isp: OMAP3 ISP device
 *
 * Return 0 if successful, or clk_prepare_enable return value if any of them
 * fails.
 */
static int isp_enable_clocks(struct isp_device *isp)
{
        int r;
        unsigned long rate;

        r = clk_prepare_enable(isp->clock[ISP_CLK_CAM_ICK]);
        if (r) {
                dev_err(isp->dev, "failed to enable cam_ick clock\n");
                goto out_clk_enable_ick;
        }
        r = clk_set_rate(isp->clock[ISP_CLK_CAM_MCLK], CM_CAM_MCLK_HZ);
        if (r) {
                dev_err(isp->dev, "clk_set_rate for cam_mclk failed\n");
                goto out_clk_enable_mclk;
        }
        r = clk_prepare_enable(isp->clock[ISP_CLK_CAM_MCLK]);
        if (r) {
                dev_err(isp->dev, "failed to enable cam_mclk clock\n");
                goto out_clk_enable_mclk;
        }
        rate = clk_get_rate(isp->clock[ISP_CLK_CAM_MCLK]);
        if (rate != CM_CAM_MCLK_HZ)
                dev_warn(isp->dev, "unexpected cam_mclk rate:\n"
                                   " expected : %d\n"
                                   " actual   : %ld\n", CM_CAM_MCLK_HZ, rate);
        r = clk_prepare_enable(isp->clock[ISP_CLK_CSI2_FCK]);
        if (r) {
                dev_err(isp->dev, "failed to enable csi2_fck clock\n");
                goto out_clk_enable_csi2_fclk;
        }
        return 0;

out_clk_enable_csi2_fclk:
        clk_disable_unprepare(isp->clock[ISP_CLK_CAM_MCLK]);
out_clk_enable_mclk:
        clk_disable_unprepare(isp->clock[ISP_CLK_CAM_ICK]);
out_clk_enable_ick:
        return r;
}

/*
 * isp_disable_clocks - Disable ISP clocks
 * @isp: OMAP3 ISP device
 */
static void isp_disable_clocks(struct isp_device *isp)
{
        clk_disable_unprepare(isp->clock[ISP_CLK_CAM_ICK]);
        clk_disable_unprepare(isp->clock[ISP_CLK_CAM_MCLK]);
        clk_disable_unprepare(isp->clock[ISP_CLK_CSI2_FCK]);
}

static const char *isp_clocks[] = {
        "cam_ick",
        "cam_mclk",
        "csi2_96m_fck",
        "l3_ick",
};

static int isp_get_clocks(struct isp_device *isp)
{
        struct clk *clk;
        unsigned int i;

        for (i = 0; i < ARRAY_SIZE(isp_clocks); ++i) {
                clk = devm_clk_get(isp->dev, isp_clocks[i]);
                if (IS_ERR(clk)) {
                        dev_err(isp->dev, "clk_get %s failed\n", isp_clocks[i]);
                        return PTR_ERR(clk);
                }

                isp->clock[i] = clk;
        }

        return 0;
}

/*
 * omap3isp_get - Acquire the ISP resource.
 *
 * Initializes the clocks for the first acquire.
 *
 * Increment the reference count on the ISP. If the first reference is taken,
 * enable clocks and power-up all submodules.
 *
 * Return a pointer to the ISP device structure, or NULL if an error occurred.
 */
static struct isp_device *__omap3isp_get(struct isp_device *isp, bool irq)
{
        struct isp_device *__isp = isp;

        if (isp == NULL)
                return NULL;

        mutex_lock(&isp->isp_mutex);
        if (isp->ref_count > 0)
                goto out;

        if (isp_enable_clocks(isp) < 0) {
                __isp = NULL;
                goto out;
        }

        /* We don't want to restore context before saving it! */
        if (isp->has_context)
                isp_restore_ctx(isp);

        if (irq)
                isp_enable_interrupts(isp);

out:
        if (__isp != NULL)
                isp->ref_count++;
        mutex_unlock(&isp->isp_mutex);

        return __isp;
}

struct isp_device *omap3isp_get(struct isp_device *isp)
{
        return __omap3isp_get(isp, true);
}

/*
 * omap3isp_put - Release the ISP
 *
 * Decrement the reference count on the ISP. If the last reference is released,
 * power-down all submodules, disable clocks and free temporary buffers.
 */
static void __omap3isp_put(struct isp_device *isp, bool save_ctx)
{
        if (isp == NULL)
                return;

        mutex_lock(&isp->isp_mutex);
        BUG_ON(isp->ref_count == 0);
        if (--isp->ref_count == 0) {
                isp_disable_interrupts(isp);
                if (save_ctx) {
                        isp_save_ctx(isp);
                        isp->has_context = 1;
                }
                /* Reset the ISP if an entity has failed to stop. This is the
                 * only way to recover from such conditions.
                 */
                if (!media_entity_enum_empty(&isp->crashed) ||
                    isp->stop_failure)
                        isp_reset(isp);
                isp_disable_clocks(isp);
        }
        mutex_unlock(&isp->isp_mutex);
}

void omap3isp_put(struct isp_device *isp)
{
        __omap3isp_put(isp, true);
}

/* --------------------------------------------------------------------------
 * Platform device driver
 */

/*
 * omap3isp_print_status - Prints the values of the ISP Control Module registers
 * @isp: OMAP3 ISP device
 */
#define ISP_PRINT_REGISTER(isp, name)\
        dev_dbg(isp->dev, "###ISP " #name "=0x%08x\n", \
                isp_reg_readl(isp, OMAP3_ISP_IOMEM_MAIN, ISP_##name))
#define SBL_PRINT_REGISTER(isp, name)\
        dev_dbg(isp->dev, "###SBL " #name "=0x%08x\n", \
                isp_reg_readl(isp, OMAP3_ISP_IOMEM_SBL, ISPSBL_##name))

void omap3isp_print_status(struct isp_device *isp)
{
        dev_dbg(isp->dev, "-------------ISP Register dump--------------\n");

        ISP_PRINT_REGISTER(isp, SYSCONFIG);
        ISP_PRINT_REGISTER(isp, SYSSTATUS);
        ISP_PRINT_REGISTER(isp, IRQ0ENABLE);
        ISP_PRINT_REGISTER(isp, IRQ0STATUS);
        ISP_PRINT_REGISTER(isp, TCTRL_GRESET_LENGTH);
        ISP_PRINT_REGISTER(isp, TCTRL_PSTRB_REPLAY);
        ISP_PRINT_REGISTER(isp, CTRL);
        ISP_PRINT_REGISTER(isp, TCTRL_CTRL);
        ISP_PRINT_REGISTER(isp, TCTRL_FRAME);
        ISP_PRINT_REGISTER(isp, TCTRL_PSTRB_DELAY);
        ISP_PRINT_REGISTER(isp, TCTRL_STRB_DELAY);
        ISP_PRINT_REGISTER(isp, TCTRL_SHUT_DELAY);
        ISP_PRINT_REGISTER(isp, TCTRL_PSTRB_LENGTH);
        ISP_PRINT_REGISTER(isp, TCTRL_STRB_LENGTH);
        ISP_PRINT_REGISTER(isp, TCTRL_SHUT_LENGTH);

        SBL_PRINT_REGISTER(isp, PCR);
        SBL_PRINT_REGISTER(isp, SDR_REQ_EXP);

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

#ifdef CONFIG_PM

/*
 * Power management support.
 *
 * As the ISP can't properly handle an input video stream interruption on a non
 * frame boundary, the ISP pipelines need to be stopped before sensors get
 * suspended. However, as suspending the sensors can require a running clock,
 * which can be provided by the ISP, the ISP can't be completely suspended
 * before the sensor.
 *
 * To solve this problem power management support is split into prepare/complete
 * and suspend/resume operations. The pipelines are stopped in prepare() and the
 * ISP clocks get disabled in suspend(). Similarly, the clocks are re-enabled in
 * resume(), and the the pipelines are restarted in complete().
 *
 * TODO: PM dependencies between the ISP and sensors are not modelled explicitly
 * yet.
 */
static int isp_pm_prepare(struct device *dev)
{
        struct isp_device *isp = dev_get_drvdata(dev);
        int reset;

        WARN_ON(mutex_is_locked(&isp->isp_mutex));

        if (isp->ref_count == 0)
                return 0;

        reset = isp_suspend_modules(isp);
        isp_disable_interrupts(isp);
        isp_save_ctx(isp);
        if (reset)
                isp_reset(isp);

        return 0;
}

static int isp_pm_suspend(struct device *dev)
{
        struct isp_device *isp = dev_get_drvdata(dev);

        WARN_ON(mutex_is_locked(&isp->isp_mutex));

        if (isp->ref_count)
                isp_disable_clocks(isp);

        return 0;
}

static int isp_pm_resume(struct device *dev)
{
        struct isp_device *isp = dev_get_drvdata(dev);

        if (isp->ref_count == 0)
                return 0;

        return isp_enable_clocks(isp);
}

static void isp_pm_complete(struct device *dev)
{
        struct isp_device *isp = dev_get_drvdata(dev);

        if (isp->ref_count == 0)
                return;

        isp_restore_ctx(isp);
        isp_enable_interrupts(isp);
        isp_resume_modules(isp);
}

#else

#define isp_pm_prepare  NULL
#define isp_pm_suspend  NULL
#define isp_pm_resume   NULL
#define isp_pm_complete NULL

#endif /* CONFIG_PM */

static void isp_unregister_entities(struct isp_device *isp)
{
        media_device_unregister(&isp->media_dev);

        omap3isp_csi2_unregister_entities(&isp->isp_csi2a);
        omap3isp_ccp2_unregister_entities(&isp->isp_ccp2);
        omap3isp_ccdc_unregister_entities(&isp->isp_ccdc);
        omap3isp_preview_unregister_entities(&isp->isp_prev);
        omap3isp_resizer_unregister_entities(&isp->isp_res);
        omap3isp_stat_unregister_entities(&isp->isp_aewb);
        omap3isp_stat_unregister_entities(&isp->isp_af);
        omap3isp_stat_unregister_entities(&isp->isp_hist);

        v4l2_device_unregister(&isp->v4l2_dev);
        media_device_cleanup(&isp->media_dev);
}

static int isp_link_entity(
        struct isp_device *isp, struct media_entity *entity,
        enum isp_interface_type interface)
{
        struct media_entity *input;
        unsigned int flags;
        unsigned int pad;
        unsigned int i;

        /* Connect the sensor to the correct interface module.
         * Parallel sensors are connected directly to the CCDC, while
         * serial sensors are connected to the CSI2a, CCP2b or CSI2c
         * receiver through CSIPHY1 or CSIPHY2.
         */
        switch (interface) {
        case ISP_INTERFACE_PARALLEL:
                input = &isp->isp_ccdc.subdev.entity;
                pad = CCDC_PAD_SINK;
                flags = 0;
                break;

        case ISP_INTERFACE_CSI2A_PHY2:
                input = &isp->isp_csi2a.subdev.entity;
                pad = CSI2_PAD_SINK;
                flags = MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED;
                break;

        case ISP_INTERFACE_CCP2B_PHY1:
        case ISP_INTERFACE_CCP2B_PHY2:
                input = &isp->isp_ccp2.subdev.entity;
                pad = CCP2_PAD_SINK;
                flags = 0;
                break;

        case ISP_INTERFACE_CSI2C_PHY1:
                input = &isp->isp_csi2c.subdev.entity;
                pad = CSI2_PAD_SINK;
                flags = MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED;
                break;

        default:
                dev_err(isp->dev, "%s: invalid interface type %u\n", __func__,
                        interface);
                return -EINVAL;
        }

        /*
         * Not all interfaces are available on all revisions of the
         * ISP. The sub-devices of those interfaces aren't initialised
         * in such a case. Check this by ensuring the num_pads is
         * non-zero.
         */
        if (!input->num_pads) {
                dev_err(isp->dev, "%s: invalid input %u\n", entity->name,
                        interface);
                return -EINVAL;
        }

        for (i = 0; i < entity->num_pads; i++) {
                if (entity->pads[i].flags & MEDIA_PAD_FL_SOURCE)
                        break;
        }
        if (i == entity->num_pads) {
                dev_err(isp->dev, "%s: no source pad in external entity %s\n",
                        __func__, entity->name);
                return -EINVAL;
        }

        return media_create_pad_link(entity, i, input, pad, flags);
}

static int isp_register_entities(struct isp_device *isp)
{
        int ret;

        isp->media_dev.dev = isp->dev;
        strscpy(isp->media_dev.model, "TI OMAP3 ISP",
                sizeof(isp->media_dev.model));
        isp->media_dev.hw_revision = isp->revision;
        isp->media_dev.ops = &isp_media_ops;
        media_device_init(&isp->media_dev);

        isp->v4l2_dev.mdev = &isp->media_dev;
        ret = v4l2_device_register(isp->dev, &isp->v4l2_dev);
        if (ret < 0) {
                dev_err(isp->dev, "%s: V4L2 device registration failed (%d)\n",
                        __func__, ret);
                goto done;
        }

        /* Register internal entities */
        ret = omap3isp_ccp2_register_entities(&isp->isp_ccp2, &isp->v4l2_dev);
        if (ret < 0)
                goto done;

        ret = omap3isp_csi2_register_entities(&isp->isp_csi2a, &isp->v4l2_dev);
        if (ret < 0)
                goto done;

        ret = omap3isp_ccdc_register_entities(&isp->isp_ccdc, &isp->v4l2_dev);
        if (ret < 0)
                goto done;

        ret = omap3isp_preview_register_entities(&isp->isp_prev,
                                                 &isp->v4l2_dev);
        if (ret < 0)
                goto done;

        ret = omap3isp_resizer_register_entities(&isp->isp_res, &isp->v4l2_dev);
        if (ret < 0)
                goto done;

        ret = omap3isp_stat_register_entities(&isp->isp_aewb, &isp->v4l2_dev);
        if (ret < 0)
                goto done;

        ret = omap3isp_stat_register_entities(&isp->isp_af, &isp->v4l2_dev);
        if (ret < 0)
                goto done;

        ret = omap3isp_stat_register_entities(&isp->isp_hist, &isp->v4l2_dev);
        if (ret < 0)
                goto done;

done:
        if (ret < 0)
                isp_unregister_entities(isp);

        return ret;
}

/*
 * isp_create_links() - Create links for internal and external ISP entities
 * @isp : Pointer to ISP device
 *
 * This function creates all links between ISP internal and external entities.
 *
 * Return: A negative error code on failure or zero on success. Possible error
 * codes are those returned by media_create_pad_link().
 */
static int isp_create_links(struct isp_device *isp)
{
        int ret;

        /* Create links between entities and video nodes. */
        ret = media_create_pad_link(
                        &isp->isp_csi2a.subdev.entity, CSI2_PAD_SOURCE,
                        &isp->isp_csi2a.video_out.video.entity, 0, 0);
        if (ret < 0)
                return ret;

        ret = media_create_pad_link(
                        &isp->isp_ccp2.video_in.video.entity, 0,
                        &isp->isp_ccp2.subdev.entity, CCP2_PAD_SINK, 0);
        if (ret < 0)
                return ret;

        ret = media_create_pad_link(
                        &isp->isp_ccdc.subdev.entity, CCDC_PAD_SOURCE_OF,
                        &isp->isp_ccdc.video_out.video.entity, 0, 0);
        if (ret < 0)
                return ret;

        ret = media_create_pad_link(
                        &isp->isp_prev.video_in.video.entity, 0,
                        &isp->isp_prev.subdev.entity, PREV_PAD_SINK, 0);
        if (ret < 0)
                return ret;

        ret = media_create_pad_link(
                        &isp->isp_prev.subdev.entity, PREV_PAD_SOURCE,
                        &isp->isp_prev.video_out.video.entity, 0, 0);
        if (ret < 0)
                return ret;

        ret = media_create_pad_link(
                        &isp->isp_res.video_in.video.entity, 0,
                        &isp->isp_res.subdev.entity, RESZ_PAD_SINK, 0);
        if (ret < 0)
                return ret;

        ret = media_create_pad_link(
                        &isp->isp_res.subdev.entity, RESZ_PAD_SOURCE,
                        &isp->isp_res.video_out.video.entity, 0, 0);

        if (ret < 0)
                return ret;

        /* Create links between entities. */
        ret = media_create_pad_link(
                        &isp->isp_csi2a.subdev.entity, CSI2_PAD_SOURCE,
                        &isp->isp_ccdc.subdev.entity, CCDC_PAD_SINK, 0);
        if (ret < 0)
                return ret;

        ret = media_create_pad_link(
                        &isp->isp_ccp2.subdev.entity, CCP2_PAD_SOURCE,
                        &isp->isp_ccdc.subdev.entity, CCDC_PAD_SINK, 0);
        if (ret < 0)
                return ret;

        ret = media_create_pad_link(
                        &isp->isp_ccdc.subdev.entity, CCDC_PAD_SOURCE_VP,
                        &isp->isp_prev.subdev.entity, PREV_PAD_SINK, 0);
        if (ret < 0)
                return ret;

        ret = media_create_pad_link(
                        &isp->isp_ccdc.subdev.entity, CCDC_PAD_SOURCE_OF,
                        &isp->isp_res.subdev.entity, RESZ_PAD_SINK, 0);
        if (ret < 0)
                return ret;

        ret = media_create_pad_link(
                        &isp->isp_prev.subdev.entity, PREV_PAD_SOURCE,
                        &isp->isp_res.subdev.entity, RESZ_PAD_SINK, 0);
        if (ret < 0)
                return ret;

        ret = media_create_pad_link(
                        &isp->isp_ccdc.subdev.entity, CCDC_PAD_SOURCE_VP,
                        &isp->isp_aewb.subdev.entity, 0,
                        MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE);
        if (ret < 0)
                return ret;

        ret = media_create_pad_link(
                        &isp->isp_ccdc.subdev.entity, CCDC_PAD_SOURCE_VP,
                        &isp->isp_af.subdev.entity, 0,
                        MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE);
        if (ret < 0)
                return ret;

        ret = media_create_pad_link(
                        &isp->isp_ccdc.subdev.entity, CCDC_PAD_SOURCE_VP,
                        &isp->isp_hist.subdev.entity, 0,
                        MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE);
        if (ret < 0)
                return ret;

        return 0;
}

static void isp_cleanup_modules(struct isp_device *isp)
{
        omap3isp_h3a_aewb_cleanup(isp);
        omap3isp_h3a_af_cleanup(isp);
        omap3isp_hist_cleanup(isp);
        omap3isp_resizer_cleanup(isp);
        omap3isp_preview_cleanup(isp);
        omap3isp_ccdc_cleanup(isp);
        omap3isp_ccp2_cleanup(isp);
        omap3isp_csi2_cleanup(isp);
        omap3isp_csiphy_cleanup(isp);
}

static int isp_initialize_modules(struct isp_device *isp)
{
        int ret;

        ret = omap3isp_csiphy_init(isp);
        if (ret < 0) {
                dev_err(isp->dev, "CSI PHY initialization failed\n");
                return ret;
        }

        ret = omap3isp_csi2_init(isp);
        if (ret < 0) {
                dev_err(isp->dev, "CSI2 initialization failed\n");
                goto error_csi2;
        }

        ret = omap3isp_ccp2_init(isp);
        if (ret < 0) {
                if (ret != -EPROBE_DEFER)
                        dev_err(isp->dev, "CCP2 initialization failed\n");
                goto error_ccp2;
        }

        ret = omap3isp_ccdc_init(isp);
        if (ret < 0) {
                dev_err(isp->dev, "CCDC initialization failed\n");
                goto error_ccdc;
        }

        ret = omap3isp_preview_init(isp);
        if (ret < 0) {
                dev_err(isp->dev, "Preview initialization failed\n");
                goto error_preview;
        }

        ret = omap3isp_resizer_init(isp);
        if (ret < 0) {
                dev_err(isp->dev, "Resizer initialization failed\n");
                goto error_resizer;
        }

        ret = omap3isp_hist_init(isp);
        if (ret < 0) {
                dev_err(isp->dev, "Histogram initialization failed\n");
                goto error_hist;
        }

        ret = omap3isp_h3a_aewb_init(isp);
        if (ret < 0) {
                dev_err(isp->dev, "H3A AEWB initialization failed\n");
                goto error_h3a_aewb;
        }

        ret = omap3isp_h3a_af_init(isp);
        if (ret < 0) {
                dev_err(isp->dev, "H3A AF initialization failed\n");
                goto error_h3a_af;
        }

        return 0;

error_h3a_af:
        omap3isp_h3a_aewb_cleanup(isp);
error_h3a_aewb:
        omap3isp_hist_cleanup(isp);
error_hist:
        omap3isp_resizer_cleanup(isp);
error_resizer:
        omap3isp_preview_cleanup(isp);
error_preview:
        omap3isp_ccdc_cleanup(isp);
error_ccdc:
        omap3isp_ccp2_cleanup(isp);
error_ccp2:
        omap3isp_csi2_cleanup(isp);
error_csi2:
        omap3isp_csiphy_cleanup(isp);

        return ret;
}

static void isp_detach_iommu(struct isp_device *isp)
{
#ifdef CONFIG_ARM_DMA_USE_IOMMU
        arm_iommu_detach_device(isp->dev);
        arm_iommu_release_mapping(isp->mapping);
        isp->mapping = NULL;
#endif
}

static int isp_attach_iommu(struct isp_device *isp)
{
#ifdef CONFIG_ARM_DMA_USE_IOMMU
        struct dma_iommu_mapping *mapping;
        int ret;

        /*
         * Create the ARM mapping, used by the ARM DMA mapping core to allocate
         * VAs. This will allocate a corresponding IOMMU domain.
         */
        mapping = arm_iommu_create_mapping(&platform_bus_type, SZ_1G, SZ_2G);
        if (IS_ERR(mapping)) {
                dev_err(isp->dev, "failed to create ARM IOMMU mapping\n");
                return PTR_ERR(mapping);
        }

        isp->mapping = mapping;

        /* Attach the ARM VA mapping to the device. */
        ret = arm_iommu_attach_device(isp->dev, mapping);
        if (ret < 0) {
                dev_err(isp->dev, "failed to attach device to VA mapping\n");
                goto error;
        }

        return 0;

error:
        arm_iommu_release_mapping(isp->mapping);
        isp->mapping = NULL;
        return ret;
#else
        return -ENODEV;
#endif
}

/*
 * isp_remove - Remove ISP platform device
 * @pdev: Pointer to ISP platform device
 *
 * Always returns 0.
 */
static int isp_remove(struct platform_device *pdev)
{
        struct isp_device *isp = platform_get_drvdata(pdev);

        v4l2_async_notifier_unregister(&isp->notifier);

        isp_unregister_entities(isp);
        isp_cleanup_modules(isp);
        isp_xclk_cleanup(isp);

        __omap3isp_get(isp, false);
        isp_detach_iommu(isp);
        __omap3isp_put(isp, false);

        media_entity_enum_cleanup(&isp->crashed);
        v4l2_async_notifier_cleanup(&isp->notifier);

        kfree(isp);

        return 0;
}

enum isp_of_phy {
        ISP_OF_PHY_PARALLEL = 0,
        ISP_OF_PHY_CSIPHY1,
        ISP_OF_PHY_CSIPHY2,
};

static int isp_subdev_notifier_complete(struct v4l2_async_notifier *async)
{
        struct isp_device *isp = container_of(async, struct isp_device,
                                              notifier);
        struct v4l2_device *v4l2_dev = &isp->v4l2_dev;
        struct v4l2_subdev *sd;
        int ret;

        ret = media_entity_enum_init(&isp->crashed, &isp->media_dev);
        if (ret)
                return ret;

        list_for_each_entry(sd, &v4l2_dev->subdevs, list) {
                if (sd->notifier != &isp->notifier)
                        continue;

                ret = isp_link_entity(isp, &sd->entity,
                                      v4l2_subdev_to_bus_cfg(sd)->interface);
                if (ret < 0)
                        return ret;
        }

        ret = v4l2_device_register_subdev_nodes(&isp->v4l2_dev);
        if (ret < 0)
                return ret;

        return media_device_register(&isp->media_dev);
}

static void isp_parse_of_parallel_endpoint(struct device *dev,
                                           struct v4l2_fwnode_endpoint *vep,
                                           struct isp_bus_cfg *buscfg)
{
        buscfg->interface = ISP_INTERFACE_PARALLEL;
        buscfg->bus.parallel.data_lane_shift = vep->bus.parallel.data_shift;
        buscfg->bus.parallel.clk_pol =
                !!(vep->bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_FALLING);
        buscfg->bus.parallel.hs_pol =
                !!(vep->bus.parallel.flags & V4L2_MBUS_VSYNC_ACTIVE_LOW);
        buscfg->bus.parallel.vs_pol =
                !!(vep->bus.parallel.flags & V4L2_MBUS_HSYNC_ACTIVE_LOW);
        buscfg->bus.parallel.fld_pol =
                !!(vep->bus.parallel.flags & V4L2_MBUS_FIELD_EVEN_LOW);
        buscfg->bus.parallel.data_pol =
                !!(vep->bus.parallel.flags & V4L2_MBUS_DATA_ACTIVE_LOW);
        buscfg->bus.parallel.bt656 = vep->bus_type == V4L2_MBUS_BT656;
}

static void isp_parse_of_csi2_endpoint(struct device *dev,
                                       struct v4l2_fwnode_endpoint *vep,
                                       struct isp_bus_cfg *buscfg)
{
        unsigned int i;

        buscfg->bus.csi2.lanecfg.clk.pos = vep->bus.mipi_csi2.clock_lane;
        buscfg->bus.csi2.lanecfg.clk.pol =
                vep->bus.mipi_csi2.lane_polarities[0];
        dev_dbg(dev, "clock lane polarity %u, pos %u\n",
                buscfg->bus.csi2.lanecfg.clk.pol,
                buscfg->bus.csi2.lanecfg.clk.pos);

        buscfg->bus.csi2.num_data_lanes = vep->bus.mipi_csi2.num_data_lanes;

        for (i = 0; i < buscfg->bus.csi2.num_data_lanes; i++) {
                buscfg->bus.csi2.lanecfg.data[i].pos =
                        vep->bus.mipi_csi2.data_lanes[i];
                buscfg->bus.csi2.lanecfg.data[i].pol =
                        vep->bus.mipi_csi2.lane_polarities[i + 1];
                dev_dbg(dev,
                        "data lane %u polarity %u, pos %u\n", i,
                        buscfg->bus.csi2.lanecfg.data[i].pol,
                        buscfg->bus.csi2.lanecfg.data[i].pos);
        }
        /*
         * FIXME: now we assume the CRC is always there. Implement a way to
         * obtain this information from the sensor. Frame descriptors, perhaps?
         */
        buscfg->bus.csi2.crc = 1;
}

static void isp_parse_of_csi1_endpoint(struct device *dev,
                                       struct v4l2_fwnode_endpoint *vep,
                                       struct isp_bus_cfg *buscfg)
{
        buscfg->bus.ccp2.lanecfg.clk.pos = vep->bus.mipi_csi1.clock_lane;
        buscfg->bus.ccp2.lanecfg.clk.pol = vep->bus.mipi_csi1.lane_polarity[0];
        dev_dbg(dev, "clock lane polarity %u, pos %u\n",
                buscfg->bus.ccp2.lanecfg.clk.pol,
        buscfg->bus.ccp2.lanecfg.clk.pos);

        buscfg->bus.ccp2.lanecfg.data[0].pos = vep->bus.mipi_csi1.data_lane;
        buscfg->bus.ccp2.lanecfg.data[0].pol =
                vep->bus.mipi_csi1.lane_polarity[1];

        dev_dbg(dev, "data lane polarity %u, pos %u\n",
                buscfg->bus.ccp2.lanecfg.data[0].pol,
                buscfg->bus.ccp2.lanecfg.data[0].pos);

        buscfg->bus.ccp2.strobe_clk_pol = vep->bus.mipi_csi1.clock_inv;
        buscfg->bus.ccp2.phy_layer = vep->bus.mipi_csi1.strobe;
        buscfg->bus.ccp2.ccp2_mode = vep->bus_type == V4L2_MBUS_CCP2;
        buscfg->bus.ccp2.vp_clk_pol = 1;

        buscfg->bus.ccp2.crc = 1;
}

static int isp_alloc_isd(struct isp_async_subdev **isd,
                         struct isp_bus_cfg **buscfg)
{
        struct isp_async_subdev *__isd;

        __isd = kzalloc(sizeof(*__isd), GFP_KERNEL);
        if (!__isd)
                return -ENOMEM;

        *isd = __isd;
        *buscfg = &__isd->bus;

        return 0;
}

static struct {
        u32 phy;
        u32 csi2_if;
        u32 csi1_if;
} isp_bus_interfaces[2] = {
        { ISP_OF_PHY_CSIPHY1,
          ISP_INTERFACE_CSI2C_PHY1, ISP_INTERFACE_CCP2B_PHY1 },
        { ISP_OF_PHY_CSIPHY2,
          ISP_INTERFACE_CSI2A_PHY2, ISP_INTERFACE_CCP2B_PHY2 },
};

static int isp_parse_of_endpoints(struct isp_device *isp)
{
        struct fwnode_handle *ep;
        struct isp_async_subdev *isd = NULL;
        struct isp_bus_cfg *buscfg;
        unsigned int i;

        ep = fwnode_graph_get_endpoint_by_id(
                dev_fwnode(isp->dev), ISP_OF_PHY_PARALLEL, 0,
                FWNODE_GRAPH_ENDPOINT_NEXT);

        if (ep) {
                struct v4l2_fwnode_endpoint vep = {
                        .bus_type = V4L2_MBUS_PARALLEL
                };
                int ret;

                dev_dbg(isp->dev, "parsing parallel interface\n");

                ret = v4l2_fwnode_endpoint_parse(ep, &vep);

                if (!ret) {
                        ret = isp_alloc_isd(&isd, &buscfg);
                        if (ret)
                                return ret;
                }

                if (!ret) {
                        isp_parse_of_parallel_endpoint(isp->dev, &vep, buscfg);
                        ret = v4l2_async_notifier_add_fwnode_remote_subdev(
                                &isp->notifier, ep, &isd->asd);
                }

                fwnode_handle_put(ep);
                if (ret)
                        kfree(isd);
        }

        for (i = 0; i < ARRAY_SIZE(isp_bus_interfaces); i++) {
                struct v4l2_fwnode_endpoint vep = {
                        .bus_type = V4L2_MBUS_CSI2_DPHY
                };
                int ret;

                ep = fwnode_graph_get_endpoint_by_id(
                        dev_fwnode(isp->dev), isp_bus_interfaces[i].phy, 0,
                        FWNODE_GRAPH_ENDPOINT_NEXT);

                if (!ep)
                        continue;

                dev_dbg(isp->dev, "parsing serial interface %u, node %pOF\n", i,
                        to_of_node(ep));

                ret = isp_alloc_isd(&isd, &buscfg);
                if (ret)
                        return ret;

                ret = v4l2_fwnode_endpoint_parse(ep, &vep);
                if (!ret) {
                        buscfg->interface = isp_bus_interfaces[i].csi2_if;
                        isp_parse_of_csi2_endpoint(isp->dev, &vep, buscfg);
                } else if (ret == -ENXIO) {
                        vep = (struct v4l2_fwnode_endpoint)
                                { .bus_type = V4L2_MBUS_CSI1 };
                        ret = v4l2_fwnode_endpoint_parse(ep, &vep);

                        if (ret == -ENXIO) {
                                vep = (struct v4l2_fwnode_endpoint)
                                        { .bus_type = V4L2_MBUS_CCP2 };
                                ret = v4l2_fwnode_endpoint_parse(ep, &vep);
                        }
                        if (!ret) {
                                buscfg->interface =
                                        isp_bus_interfaces[i].csi1_if;
                                isp_parse_of_csi1_endpoint(isp->dev, &vep,
                                                           buscfg);
                        }
                }

                if (!ret)
                        ret = v4l2_async_notifier_add_fwnode_remote_subdev(
                                &isp->notifier, ep, &isd->asd);

                fwnode_handle_put(ep);
                if (ret)
                        kfree(isd);
        }

        return 0;
}

static const struct v4l2_async_notifier_operations isp_subdev_notifier_ops = {
        .complete = isp_subdev_notifier_complete,
};

/*
 * isp_probe - Probe ISP platform device
 * @pdev: Pointer to ISP platform device
 *
 * Returns 0 if successful,
 *   -ENOMEM if no memory available,
 *   -ENODEV if no platform device resources found
 *     or no space for remapping registers,
 *   -EINVAL if couldn't install ISR,
 *   or clk_get return error value.
 */
static int isp_probe(struct platform_device *pdev)
{
        struct isp_device *isp;
        struct resource *mem;
        int ret;
        int i, m;

        isp = kzalloc(sizeof(*isp), GFP_KERNEL);
        if (!isp) {
                dev_err(&pdev->dev, "could not allocate memory\n");
                return -ENOMEM;
        }

        ret = fwnode_property_read_u32(of_fwnode_handle(pdev->dev.of_node),
                                       "ti,phy-type", &isp->phy_type);
        if (ret)
                goto error_release_isp;

        isp->syscon = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
                                                      "syscon");
        if (IS_ERR(isp->syscon)) {
                ret = PTR_ERR(isp->syscon);
                goto error_release_isp;
        }

        ret = of_property_read_u32_index(pdev->dev.of_node,
                                         "syscon", 1, &isp->syscon_offset);
        if (ret)
                goto error_release_isp;

        isp->autoidle = autoidle;

        mutex_init(&isp->isp_mutex);
        spin_lock_init(&isp->stat_lock);
        v4l2_async_notifier_init(&isp->notifier);
        isp->dev = &pdev->dev;

        ret = isp_parse_of_endpoints(isp);
        if (ret < 0)
                goto error;

        isp->ref_count = 0;

        ret = dma_coerce_mask_and_coherent(isp->dev, DMA_BIT_MASK(32));
        if (ret)
                goto error;

        platform_set_drvdata(pdev, isp);

        /* Regulators */
        isp->isp_csiphy1.vdd = devm_regulator_get(&pdev->dev, "vdd-csiphy1");
        isp->isp_csiphy2.vdd = devm_regulator_get(&pdev->dev, "vdd-csiphy2");

        /* Clocks
         *
         * The ISP clock tree is revision-dependent. We thus need to enable ICLK
         * manually to read the revision before calling __omap3isp_get().
         *
         * Start by mapping the ISP MMIO area, which is in two pieces.
         * The ISP IOMMU is in between. Map both now, and fill in the
         * ISP revision specific portions a little later in the
         * function.
         */
        for (i = 0; i < 2; i++) {
                unsigned int map_idx = i ? OMAP3_ISP_IOMEM_CSI2A_REGS1 : 0;

                mem = platform_get_resource(pdev, IORESOURCE_MEM, i);
                isp->mmio_base[map_idx] =
                        devm_ioremap_resource(isp->dev, mem);
                if (IS_ERR(isp->mmio_base[map_idx]))
                        return PTR_ERR(isp->mmio_base[map_idx]);
        }

        ret = isp_get_clocks(isp);
        if (ret < 0)
                goto error;

        ret = clk_enable(isp->clock[ISP_CLK_CAM_ICK]);
        if (ret < 0)
                goto error;

        isp->revision = isp_reg_readl(isp, OMAP3_ISP_IOMEM_MAIN, ISP_REVISION);
        dev_info(isp->dev, "Revision %d.%d found\n",
                 (isp->revision & 0xf0) >> 4, isp->revision & 0x0f);

        clk_disable(isp->clock[ISP_CLK_CAM_ICK]);

        if (__omap3isp_get(isp, false) == NULL) {
                ret = -ENODEV;
                goto error;
        }

        ret = isp_reset(isp);
        if (ret < 0)
                goto error_isp;

        ret = isp_xclk_init(isp);
        if (ret < 0)
                goto error_isp;

        /* Memory resources */
        for (m = 0; m < ARRAY_SIZE(isp_res_maps); m++)
                if (isp->revision == isp_res_maps[m].isp_rev)
                        break;

        if (m == ARRAY_SIZE(isp_res_maps)) {
                dev_err(isp->dev, "No resource map found for ISP rev %d.%d\n",
                        (isp->revision & 0xf0) >> 4, isp->revision & 0xf);
                ret = -ENODEV;
                goto error_isp;
        }

        for (i = 1; i < OMAP3_ISP_IOMEM_CSI2A_REGS1; i++)
                isp->mmio_base[i] =
                        isp->mmio_base[0] + isp_res_maps[m].offset[i];

        for (i = OMAP3_ISP_IOMEM_CSIPHY2; i < OMAP3_ISP_IOMEM_LAST; i++)
                isp->mmio_base[i] =
                        isp->mmio_base[OMAP3_ISP_IOMEM_CSI2A_REGS1]
                        + isp_res_maps[m].offset[i];

        isp->mmio_hist_base_phys =
                mem->start + isp_res_maps[m].offset[OMAP3_ISP_IOMEM_HIST];

        /* IOMMU */
        ret = isp_attach_iommu(isp);
        if (ret < 0) {
                dev_err(&pdev->dev, "unable to attach to IOMMU\n");
                goto error_isp;
        }

        /* Interrupt */
        ret = platform_get_irq(pdev, 0);
        if (ret <= 0) {
                ret = -ENODEV;
                goto error_iommu;
        }
        isp->irq_num = ret;

        if (devm_request_irq(isp->dev, isp->irq_num, isp_isr, IRQF_SHARED,
                             "OMAP3 ISP", isp)) {
                dev_err(isp->dev, "Unable to request IRQ\n");
                ret = -EINVAL;
                goto error_iommu;
        }

        /* Entities */
        ret = isp_initialize_modules(isp);
        if (ret < 0)
                goto error_iommu;

        ret = isp_register_entities(isp);
        if (ret < 0)
                goto error_modules;

        ret = isp_create_links(isp);
        if (ret < 0)
                goto error_register_entities;

        isp->notifier.ops = &isp_subdev_notifier_ops;

        ret = v4l2_async_notifier_register(&isp->v4l2_dev, &isp->notifier);
        if (ret)
                goto error_register_entities;

        isp_core_init(isp, 1);
        omap3isp_put(isp);

        return 0;

error_register_entities:
        isp_unregister_entities(isp);
error_modules:
        isp_cleanup_modules(isp);
error_iommu:
        isp_detach_iommu(isp);
error_isp:
        isp_xclk_cleanup(isp);
        __omap3isp_put(isp, false);
error:
        v4l2_async_notifier_cleanup(&isp->notifier);
        mutex_destroy(&isp->isp_mutex);
error_release_isp:
        kfree(isp);

        return ret;
}

static const struct dev_pm_ops omap3isp_pm_ops = {
        .prepare = isp_pm_prepare,
        .suspend = isp_pm_suspend,
        .resume = isp_pm_resume,
        .complete = isp_pm_complete,
};

static const struct platform_device_id omap3isp_id_table[] = {
        { "omap3isp", 0 },
        { },
};
MODULE_DEVICE_TABLE(platform, omap3isp_id_table);

static const struct of_device_id omap3isp_of_table[] = {
        { .compatible = "ti,omap3-isp" },
        { },
};
MODULE_DEVICE_TABLE(of, omap3isp_of_table);

static struct platform_driver omap3isp_driver = {
        .probe = isp_probe,
        .remove = isp_remove,
        .id_table = omap3isp_id_table,
        .driver = {
                .name = "omap3isp",
                .pm     = &omap3isp_pm_ops,
                .of_match_table = omap3isp_of_table,
        },
};

module_platform_driver(omap3isp_driver);

MODULE_AUTHOR("Nokia Corporation");
MODULE_DESCRIPTION("TI OMAP3 ISP driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(ISP_VIDEO_DRIVER_VERSION);