isp.c

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/*
 * isp.c
 *
 * TI OMAP3 ISP - Core
 *
 * Copyright (C) 2006-2010 Nokia Corporation
 * Copyright (C) 2007-2009 Texas Instruments, Inc.
 *
 * Contacts: Laurent Pinchart <[email protected]>
 *       Sakari Ailus <[email protected]>
 *
 * Contributors:
 *  Laurent Pinchart <[email protected]>
 *  Sakari Ailus <[email protected]>
 *  David Cohen <[email protected]>
 *  Stanimir Varbanov <[email protected]>
 *  Vimarsh Zutshi <[email protected]>
 *  Tuukka Toivonen <[email protected]>
 *  Sergio Aguirre <[email protected]>
 *  Antti Koskipaa <[email protected]>
 *  Ivan T. Ivanov <[email protected]>
 *  RaniSuneela <[email protected]>
 *  Atanas Filipov <[email protected]>
 *  Gjorgji Rosikopulos <[email protected]>
 *  Hiroshi DOYU <[email protected]>
 *  Nayden Kanchev <[email protected]>
 *  Phil Carmody <[email protected]>
 *  Artem Bityutskiy <[email protected]>
 *  Dominic Curran <[email protected]>
 *  Ilkka Myllyperkio <[email protected]>
 *  Pallavi Kulkarni <[email protected]>
 *  Vaibhav Hiremath <[email protected]>
 *  Mohit Jalori <[email protected]>
 *  Sameer Venkatraman <[email protected]>
 *  Senthilvadivu Guruswamy <[email protected]>
 *  Thara Gopinath <[email protected]>
 *  Toni Leinonen <[email protected]>
 *  Troy Laramy <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

#include <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/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 <plat/cpu.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,
    },
    {
        .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,
    },
};

/* 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/[email protected]/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);
}

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_enable return value if any of tthem fails.
 */
static int isp_enable_clocks(struct isp_device *isp)
{
    int r;
    unsigned long rate;
    int divisor;

    /*
     * cam_mclk clock chain:
     *   dpll4 -> dpll4_m5 -> dpll4_m5x2 -> cam_mclk
     *
     * In OMAP3630 dpll4_m5x2 != 2 x dpll4_m5 but both are
     * set to the same value. Hence the rate set for dpll4_m5
     * has to be twice of what is set on OMAP3430 to get
     * the required value for cam_mclk
     */
    if (cpu_is_omap3630())
        divisor = 1;
    else
        divisor = 2;

    r = clk_enable(isp->clock[ISP_CLK_CAM_ICK]);
    if (r) {
        dev_err(isp->dev, "clk_enable cam_ick failed\n");
        goto out_clk_enable_ick;
    }
    r = clk_set_rate(isp->clock[ISP_CLK_DPLL4_M5_CK],
             CM_CAM_MCLK_HZ/divisor);
    if (r) {
        dev_err(isp->dev, "clk_set_rate for dpll4_m5_ck failed\n");
        goto out_clk_enable_mclk;
    }
    r = clk_enable(isp->clock[ISP_CLK_CAM_MCLK]);
    if (r) {
        dev_err(isp->dev, "clk_enable cam_mclk failed\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_enable(isp->clock[ISP_CLK_CSI2_FCK]);
    if (r) {
        dev_err(isp->dev, "clk_enable csi2_fck failed\n");
        goto out_clk_enable_csi2_fclk;
    }
    return 0;

out_clk_enable_csi2_fclk:
    clk_disable(isp->clock[ISP_CLK_CAM_MCLK]);
out_clk_enable_mclk:
    clk_disable(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(isp->clock[ISP_CLK_CAM_ICK]);
    clk_disable(isp->clock[ISP_CLK_CAM_MCLK]);
    clk_disable(isp->clock[ISP_CLK_CSI2_FCK]);
}

static const char *isp_clocks[] = {
    "cam_ick",
    "cam_mclk",
    "dpll4_m5_ck",
    "csi2_96m_fck",
    "l3_ick",
};

static void isp_put_clocks(struct isp_device *isp)
{
    unsigned int i;

    for (i = 0; i < ARRAY_SIZE(isp_clocks); ++i) {
        if (isp->clock[i]) {
            clk_put(isp->clock[i]);
            isp->clock[i] = NULL;
        }
    }
}

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 = clk_get(isp->dev, isp_clocks[i]);
        if (IS_ERR(clk)) {
            dev_err(isp->dev, "clk_get %s failed\n", isp_clocks[i]);
            isp_put_clocks(isp);
            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) {
            printk(KERN_ERR "%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) {
            printk(KERN_ERR "%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) {
        printk(KERN_ERR "%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) {
        printk(KERN_ERR "%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;

        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:
            printk(KERN_ERR "%s: invalid interface type %u\n",
                   __func__, subdevs->interface);
            ret = -EINVAL;
            goto done;
        }

        ret = media_entity_create_link(&sensor->entity, 0, 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 __devexit isp_remove(struct platform_device *pdev)
{
    struct isp_device *isp = platform_get_drvdata(pdev);
    int i;

    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);

    free_irq(isp->irq_num, isp);
    isp_put_clocks(isp);

    for (i = 0; i < OMAP3_ISP_IOMEM_LAST; i++) {
        if (isp->mmio_base[i]) {
            iounmap(isp->mmio_base[i]);
            isp->mmio_base[i] = NULL;
        }

        if (isp->mmio_base_phys[i]) {
            release_mem_region(isp->mmio_base_phys[i],
                       isp->mmio_size[i]);
            isp->mmio_base_phys[i] = 0;
        }
    }

    regulator_put(isp->isp_csiphy1.vdd);
    regulator_put(isp->isp_csiphy2.vdd);
    kfree(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 (!request_mem_region(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] = ioremap_nocache(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 __devinit 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 = kzalloc(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 = regulator_get(&pdev->dev, "VDD_CSIPHY1");
    isp->isp_csiphy2.vdd = regulator_get(&pdev->dev, "VDD_CSIPHY2");

    /* Clocks */
    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;

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

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

    /* Memory resources */
    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);

    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 (request_irq(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 error_irq;

    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);
error_irq:
    free_irq(isp->irq_num, isp);
detach_dev:
    iommu_detach_device(isp->domain, &pdev->dev);
free_domain:
    iommu_domain_free(isp->domain);
error_isp:
    omap3isp_put(isp);
error:
    isp_put_clocks(isp);

    for (i = 0; i < OMAP3_ISP_IOMEM_LAST; i++) {
        if (isp->mmio_base[i]) {
            iounmap(isp->mmio_base[i]);
            isp->mmio_base[i] = NULL;
        }

        if (isp->mmio_base_phys[i]) {
            release_mem_region(isp->mmio_base_phys[i],
                       isp->mmio_size[i]);
            isp->mmio_base_phys[i] = 0;
        }
    }
    regulator_put(isp->isp_csiphy2.vdd);
    regulator_put(isp->isp_csiphy1.vdd);
    platform_set_drvdata(pdev, NULL);

    mutex_destroy(&isp->isp_mutex);
    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 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 = __devexit_p(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);