/*
 * 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>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

#include <asm/cacheflush.h>

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

#include <media/v4l2-common.h>
#include <media/v4l2-device.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,
                .map = 1 << OMAP3_ISP_IOMEM_MAIN |
                       1 << OMAP3_ISP_IOMEM_CCP2 |
                       1 << OMAP3_ISP_IOMEM_CCDC |
                       1 << OMAP3_ISP_IOMEM_HIST |
                       1 << OMAP3_ISP_IOMEM_H3A |
                       1 << OMAP3_ISP_IOMEM_PREV |
                       1 << OMAP3_ISP_IOMEM_RESZ |
                       1 << OMAP3_ISP_IOMEM_SBL |
                       1 << OMAP3_ISP_IOMEM_CSI2A_REGS1 |
                       1 << OMAP3_ISP_IOMEM_CSIPHY2 |
                       1 << OMAP3_ISP_IOMEM_343X_CONTROL_CSIRXFE,
        },
        {
                .isp_rev = ISP_REVISION_15_0,
                .map = 1 << OMAP3_ISP_IOMEM_MAIN |
                       1 << OMAP3_ISP_IOMEM_CCP2 |
                       1 << OMAP3_ISP_IOMEM_CCDC |
                       1 << OMAP3_ISP_IOMEM_HIST |
                       1 << OMAP3_ISP_IOMEM_H3A |
                       1 << OMAP3_ISP_IOMEM_PREV |
                       1 << OMAP3_ISP_IOMEM_RESZ |
                       1 << OMAP3_ISP_IOMEM_SBL |
                       1 << OMAP3_ISP_IOMEM_CSI2A_REGS1 |
                       1 << OMAP3_ISP_IOMEM_CSIPHY2 |
                       1 << OMAP3_ISP_IOMEM_CSI2A_REGS2 |
                       1 << OMAP3_ISP_IOMEM_CSI2C_REGS1 |
                       1 << OMAP3_ISP_IOMEM_CSIPHY1 |
                       1 << OMAP3_ISP_IOMEM_CSI2C_REGS2 |
                       1 << OMAP3_ISP_IOMEM_3630_CONTROL_CAMERA_PHY_CTRL,
        },
};

/* 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);
}

/*
 * 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_set_xclk - Configures the specified cam_xclk to the desired frequency.
 * @isp: OMAP3 ISP device
 * @xclk: Desired frequency of the clock in Hz. 0 = stable low, 1 is stable high
 * @xclksel: XCLK to configure (0 = A, 1 = B).
 *
 * Configures the specified MCLK divisor in the ISP timing control register
 * (TCTRL_CTRL) to generate the desired xclk clock value.
 *
 * Divisor = cam_mclk_hz / xclk
 *
 * Returns the final frequency that is actually being generated
 **/
static u32 isp_set_xclk(struct isp_device *isp, u32 xclk, u8 xclksel)
{
        u32 divisor;
        u32 currentxclk;
        unsigned long mclk_hz;

        if (!omap3isp_get(isp))
                return 0;

        mclk_hz = clk_get_rate(isp->clock[ISP_CLK_CAM_MCLK]);

        if (xclk >= mclk_hz) {
                divisor = ISPTCTRL_CTRL_DIV_BYPASS;
                currentxclk = mclk_hz;
        } else if (xclk >= 2) {
                divisor = mclk_hz / xclk;
                if (divisor >= ISPTCTRL_CTRL_DIV_BYPASS)
                        divisor = ISPTCTRL_CTRL_DIV_BYPASS - 1;
                currentxclk = mclk_hz / divisor;
        } else {
                divisor = xclk;
                currentxclk = 0;
        }

        switch (xclksel) {
        case ISP_XCLK_A:
                isp_reg_clr_set(isp, OMAP3_ISP_IOMEM_MAIN, ISP_TCTRL_CTRL,
                                ISPTCTRL_CTRL_DIVA_MASK,
                                divisor << ISPTCTRL_CTRL_DIVA_SHIFT);
                dev_dbg(isp->dev, "isp_set_xclk(): cam_xclka set to %d Hz\n",
                        currentxclk);
                break;
        case ISP_XCLK_B:
                isp_reg_clr_set(isp, OMAP3_ISP_IOMEM_MAIN, ISP_TCTRL_CTRL,
                                ISPTCTRL_CTRL_DIVB_MASK,
                                divisor << ISPTCTRL_CTRL_DIVB_SHIFT);
                dev_dbg(isp->dev, "isp_set_xclk(): cam_xclkb set to %d Hz\n",
                        currentxclk);
                break;
        case ISP_XCLK_NONE:
        default:
                omap3isp_put(isp);
                dev_dbg(isp->dev, "ISP_ERR: isp_set_xclk(): Invalid requested "
                        "xclk. Must be 0 (A) or 1 (B).\n");
                return -EINVAL;
        }

        /* Do we go from stable whatever to clock? */
        if (divisor >= 2 && isp->xclk_divisor[xclksel - 1] < 2)
                omap3isp_get(isp);
        /* Stopping the clock. */
        else if (divisor < 2 && isp->xclk_divisor[xclksel - 1] >= 2)
                omap3isp_put(isp);

        isp->xclk_divisor[xclksel - 1] = divisor;

        omap3isp_put(isp);

        return currentxclk;
}

/*
 * 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 cConfigure 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_platform_data *pdata,
                               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 |= pdata->clk_pol << ISPCTRL_PAR_CLK_POL_SHIFT;
                shift += pdata->data_lane_shift * 2;
                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.
 *
 * Returns IRQ_HANDLED when IRQ was correctly handled, or IRQ_NONE when the
 * IRQ wasn't handled.
 */
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;
}

/* -----------------------------------------------------------------------------
 * Pipeline power management
 *
 * Entities must be powered up when part of a pipeline that contains at least
 * one open video device node.
 *
 * To achieve this use the entity use_count field to track the number of users.
 * For entities corresponding to video device nodes the use_count field stores
 * the users count of the node. For entities corresponding to subdevs the
 * use_count field stores the total number of users of all video device nodes
 * in the pipeline.
 *
 * The omap3isp_pipeline_pm_use() function must be called in the open() and
 * close() handlers of video device nodes. It increments or decrements the use
 * count of all subdev entities in the pipeline.
 *
 * To react to link management on powered pipelines, the link setup notification
 * callback updates the use count of all entities in the source and sink sides
 * of the link.
 */

/*
 * isp_pipeline_pm_use_count - Count the number of users of a pipeline
 * @entity: The entity
 *
 * Return the total number of users of all video device nodes in the pipeline.
 */
static int isp_pipeline_pm_use_count(struct media_entity *entity)
{
        struct media_entity_graph graph;
        int use = 0;

        media_entity_graph_walk_start(&graph, entity);

        while ((entity = media_entity_graph_walk_next(&graph))) {
                if (media_entity_type(entity) == MEDIA_ENT_T_DEVNODE)
                        use += entity->use_count;
        }

        return use;
}

/*
 * isp_pipeline_pm_power_one - Apply power change to an entity
 * @entity: The entity
 * @change: Use count change
 *
 * Change the entity use count by @change. If the entity is a subdev update its
 * power state by calling the core::s_power operation when the use count goes
 * from 0 to != 0 or from != 0 to 0.
 *
 * Return 0 on success or a negative error code on failure.
 */
static int isp_pipeline_pm_power_one(struct media_entity *entity, int change)
{
        struct v4l2_subdev *subdev;
        int ret;

        subdev = media_entity_type(entity) == MEDIA_ENT_T_V4L2_SUBDEV
               ? media_entity_to_v4l2_subdev(entity) : NULL;

        if (entity->use_count == 0 && change > 0 && subdev != NULL) {
                ret = v4l2_subdev_call(subdev, core, s_power, 1);
                if (ret < 0 && ret != -ENOIOCTLCMD)
                        return ret;
        }

        entity->use_count += change;
        WARN_ON(entity->use_count < 0);

        if (entity->use_count == 0 && change < 0 && subdev != NULL)
                v4l2_subdev_call(subdev, core, s_power, 0);

        return 0;
}

/*
 * isp_pipeline_pm_power - Apply power change to all entities in a pipeline
 * @entity: The entity
 * @change: Use count change
 *
 * Walk the pipeline to update the use count and the power state of all non-node
 * entities.
 *
 * Return 0 on success or a negative error code on failure.
 */
static int isp_pipeline_pm_power(struct media_entity *entity, int change)
{
        struct media_entity_graph graph;
        struct media_entity *first = entity;
        int ret = 0;

        if (!change)
                return 0;

        media_entity_graph_walk_start(&graph, entity);

        while (!ret && (entity = media_entity_graph_walk_next(&graph)))
                if (media_entity_type(entity) != MEDIA_ENT_T_DEVNODE)
                        ret = isp_pipeline_pm_power_one(entity, change);

        if (!ret)
                return 0;

        media_entity_graph_walk_start(&graph, first);

        while ((first = media_entity_graph_walk_next(&graph))
               && first != entity)
                if (media_entity_type(first) != MEDIA_ENT_T_DEVNODE)
                        isp_pipeline_pm_power_one(first, -change);

        return ret;
}

/*
 * omap3isp_pipeline_pm_use - Update the use count of an entity
 * @entity: The entity
 * @use: Use (1) or stop using (0) the entity
 *
 * Update the use count of all entities in the pipeline and power entities on or
 * off accordingly.
 *
 * Return 0 on success or a negative error code on failure. Powering entities
 * off is assumed to never fail. No failure can occur when the use parameter is
 * set to 0.
 */
int omap3isp_pipeline_pm_use(struct media_entity *entity, int use)
{
        int change = use ? 1 : -1;
        int ret;

        mutex_lock(&entity->parent->graph_mutex);

        /* Apply use count to node. */
        entity->use_count += change;
        WARN_ON(entity->use_count < 0);

        /* Apply power change to connected non-nodes. */
        ret = isp_pipeline_pm_power(entity, change);
        if (ret < 0)
                entity->use_count -= change;

        mutex_unlock(&entity->parent->graph_mutex);

        return ret;
}

/*
 * isp_pipeline_link_notify - Link management notification callback
 * @source: Pad at the start of the link
 * @sink: Pad at the end of the link
 * @flags: New link flags that will be applied
 *
 * React to link management on powered pipelines by updating the use count of
 * all entities in the source and sink sides of the link. Entities are powered
 * on or off accordingly.
 *
 * Return 0 on success or a negative error code on failure. Powering entities
 * off is assumed to never fail. This function will not fail for disconnection
 * events.
 */
static int isp_pipeline_link_notify(struct media_pad *source,
                                    struct media_pad *sink, u32 flags)
{
        int source_use = isp_pipeline_pm_use_count(source->entity);
        int sink_use = isp_pipeline_pm_use_count(sink->entity);
        int ret;

        if (!(flags & MEDIA_LNK_FL_ENABLED)) {
                /* Powering off entities is assumed to never fail. */
                isp_pipeline_pm_power(source->entity, -sink_use);
                isp_pipeline_pm_power(sink->entity, -source_use);
                return 0;
        }

        ret = isp_pipeline_pm_power(source->entity, sink_use);
        if (ret < 0)
                return ret;

        ret = isp_pipeline_pm_power(sink->entity, source_use);
        if (ret < 0)
                isp_pipeline_pm_power(source->entity, -sink_use);

        return ret;
}

/* -----------------------------------------------------------------------------
 * 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;

        /* If the preview engine crashed it might not respond to read/write
         * operations on the L4 bus. This would result in a bus fault and a
         * kernel oops. Refuse to start streaming in that case. 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 ((pipe->entities & isp->crashed) &
            (1U << isp->isp_prev.subdev.entity.id))
                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_source(pad);
                if (pad == NULL ||
                    media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
                        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;
                }
        }

        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_source(pad);
                if (pad == NULL ||
                    media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
                        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);
                }

                v4l2_subdev_call(subdev, video, s_stream, 0);

                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);
                else
                        ret = 0;

                if (ret) {
                        dev_info(isp->dev, "Unable to stop %s\n", subdev->name);
                        /* If the entity failed to stopped, assume it has
                         * crashed. Mark it as such, the ISP will be reset when
                         * applications will release it.
                         */
                        isp->crashed |= 1U << subdev->entity.id;
                        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;
}

/*
 * 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_source(&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 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 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->crashed = 0;
        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->queue->irqlock, flags);
                if (video->dmaqueue_flags & ISP_VIDEO_DMAQUEUE_UNDERRUN) {
                        spin_unlock_irqrestore(&video->queue->irqlock, flags);
                        atomic_set(stopping, 0);
                        smp_mb();
                        return 0;
                }
                spin_unlock_irqrestore(&video->queue->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_stopped - 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.
 */
void omap3isp_put(struct isp_device *isp)
{
        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 (isp->domain) {
                        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 (isp->crashed)
                        isp_reset(isp);
                isp_disable_clocks(isp);
        }
        mutex_unlock(&isp->isp_mutex);
}

/* --------------------------------------------------------------------------
 * 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 reenabled in
 * resume(), and the the pipelines are restarted in complete().
 *
 * TODO: PM dependencies between the ISP and sensors are not modeled 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)
{
        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_unregister(&isp->media_dev);
}

/*
 * isp_register_subdev_group - Register a group of subdevices
 * @isp: OMAP3 ISP device
 * @board_info: I2C subdevs board information array
 *
 * Register all I2C subdevices in the board_info array. The array must be
 * terminated by a NULL entry, and the first entry must be the sensor.
 *
 * Return a pointer to the sensor media entity if it has been successfully
 * registered, or NULL otherwise.
 */
static struct v4l2_subdev *
isp_register_subdev_group(struct isp_device *isp,
                     struct isp_subdev_i2c_board_info *board_info)
{
        struct v4l2_subdev *sensor = NULL;
        unsigned int first;

        if (board_info->board_info == NULL)
                return NULL;

        for (first = 1; board_info->board_info; ++board_info, first = 0) {
                struct v4l2_subdev *subdev;
                struct i2c_adapter *adapter;

                adapter = i2c_get_adapter(board_info->i2c_adapter_id);
                if (adapter == NULL) {
                        dev_err(isp->dev, "%s: Unable to get I2C adapter %d for "
                                "device %s\n", __func__,
                                board_info->i2c_adapter_id,
                                board_info->board_info->type);
                        continue;
                }

                subdev = v4l2_i2c_new_subdev_board(&isp->v4l2_dev, adapter,
                                board_info->board_info, NULL);
                if (subdev == NULL) {
                        dev_err(isp->dev, "%s: Unable to register subdev %s\n",
                                __func__, board_info->board_info->type);
                        continue;
                }

                if (first)
                        sensor = subdev;
        }

        return sensor;
}

static int isp_register_entities(struct isp_device *isp)
{
        struct isp_platform_data *pdata = isp->pdata;
        struct isp_v4l2_subdevs_group *subdevs;
        int ret;

        isp->media_dev.dev = isp->dev;
        strlcpy(isp->media_dev.model, "TI OMAP3 ISP",
                sizeof(isp->media_dev.model));
        isp->media_dev.hw_revision = isp->revision;
        isp->media_dev.link_notify = isp_pipeline_link_notify;
        ret = media_device_register(&isp->media_dev);
        if (ret < 0) {
                dev_err(isp->dev, "%s: Media device registration failed (%d)\n",
                        __func__, ret);
                return ret;
        }

        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;

        /* Register external entities */
        for (subdevs = pdata->subdevs; subdevs && subdevs->subdevs; ++subdevs) {
                struct v4l2_subdev *sensor;
                struct media_entity *input;
                unsigned int flags;
                unsigned int pad;
                unsigned int i;

                sensor = isp_register_subdev_group(isp, subdevs->subdevs);
                if (sensor == NULL)
                        continue;

                sensor->host_priv = subdevs;

                /* 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 (subdevs->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__, subdevs->interface);
                        ret = -EINVAL;
                        goto done;
                }

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

                ret = media_entity_create_link(&sensor->entity, i, input, pad,
                                               flags);
                if (ret < 0)
                        goto done;
        }

        ret = v4l2_device_register_subdev_nodes(&isp->v4l2_dev);

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

        return ret;
}

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);
}

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");
                goto error_csiphy;
        }

        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) {
                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;
        }

        /* Connect the submodules. */
        ret = media_entity_create_link(
                        &isp->isp_csi2a.subdev.entity, CSI2_PAD_SOURCE,
                        &isp->isp_ccdc.subdev.entity, CCDC_PAD_SINK, 0);
        if (ret < 0)
                goto error_link;

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

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

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

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

        ret = media_entity_create_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)
                goto error_link;

        ret = media_entity_create_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)
                goto error_link;

        ret = media_entity_create_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)
                goto error_link;

        return 0;

error_link:
        omap3isp_h3a_af_cleanup(isp);
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:
error_csiphy:
        return ret;
}

/*
 * 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);

        isp_unregister_entities(isp);
        isp_cleanup_modules(isp);

        __omap3isp_get(isp, false);
        iommu_detach_device(isp->domain, &pdev->dev);
        iommu_domain_free(isp->domain);
        isp->domain = NULL;
        omap3isp_put(isp);

        return 0;
}

static int isp_map_mem_resource(struct platform_device *pdev,
                                struct isp_device *isp,
                                enum isp_mem_resources res)
{
        struct resource *mem;

        /* request the mem region for the camera registers */

        mem = platform_get_resource(pdev, IORESOURCE_MEM, res);
        if (!mem) {
                dev_err(isp->dev, "no mem resource?\n");
                return -ENODEV;
        }

        if (!devm_request_mem_region(isp->dev, mem->start, resource_size(mem),
                                     pdev->name)) {
                dev_err(isp->dev,
                        "cannot reserve camera register I/O region\n");
                return -ENODEV;

        }
        isp->mmio_base_phys[res] = mem->start;
        isp->mmio_size[res] = resource_size(mem);

        /* map the region */
        isp->mmio_base[res] = devm_ioremap_nocache(isp->dev,
                                                   isp->mmio_base_phys[res],
                                                   isp->mmio_size[res]);
        if (!isp->mmio_base[res]) {
                dev_err(isp->dev, "cannot map camera register I/O region\n");
                return -ENODEV;
        }

        return 0;
}

/*
 * 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_platform_data *pdata = pdev->dev.platform_data;
        struct isp_device *isp;
        int ret;
        int i, m;

        if (pdata == NULL)
                return -EINVAL;

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

        isp->autoidle = autoidle;
        isp->platform_cb.set_xclk = isp_set_xclk;

        mutex_init(&isp->isp_mutex);
        spin_lock_init(&isp->stat_lock);

        isp->dev = &pdev->dev;
        isp->pdata = pdata;
        isp->ref_count = 0;

        isp->raw_dmamask = DMA_BIT_MASK(32);
        isp->dev->dma_mask = &isp->raw_dmamask;
        isp->dev->coherent_dma_mask = DMA_BIT_MASK(32);

        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().
         */
        ret = isp_map_mem_resource(pdev, isp, OMAP3_ISP_IOMEM_MAIN);
        if (ret < 0)
                goto error;

        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;

        /* 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_LAST; i++) {
                if (isp_res_maps[m].map & 1 << i) {
                        ret = isp_map_mem_resource(pdev, isp, i);
                        if (ret)
                                goto error_isp;
                }
        }

        isp->domain = iommu_domain_alloc(pdev->dev.bus);
        if (!isp->domain) {
                dev_err(isp->dev, "can't alloc iommu domain\n");
                ret = -ENOMEM;
                goto error_isp;
        }

        ret = iommu_attach_device(isp->domain, &pdev->dev);
        if (ret) {
                dev_err(&pdev->dev, "can't attach iommu device: %d\n", ret);
                goto free_domain;
        }

        /* Interrupt */
        isp->irq_num = platform_get_irq(pdev, 0);
        if (isp->irq_num <= 0) {
                dev_err(isp->dev, "No IRQ resource\n");
                ret = -ENODEV;
                goto detach_dev;
        }

        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 detach_dev;
        }

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

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

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

        return 0;

error_modules:
        isp_cleanup_modules(isp);
detach_dev:
        iommu_detach_device(isp->domain, &pdev->dev);
free_domain:
        iommu_domain_free(isp->domain);
error_isp:
        omap3isp_put(isp);
error:
        platform_set_drvdata(pdev, NULL);

        mutex_destroy(&isp->isp_mutex);

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

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

module_platform_driver(omap3isp_driver);

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