chan->viops[i].frame.iFrm.y1 + chan->yPitch;
                    chan->viops[i].frame.iFrm.cb2 = 
                      chan->viops[i].frame.iFrm.cb1 + chan->cPitch;
                    chan->viops[i].frame.iFrm.cr2 = 
                      chan->viops[i].frame.iFrm.cr1 + chan->cPitch;            
                }    
                if(i > 1) {
                    /* don't put the first 2 viop into the queue */
                    QUE_enqueue(&chan->qIn, (QUE_Handle)&chan->viops[i]);
                }

            }
        }    
        CACHE_clean(CACHE_L2ALL, 0, 0);
        chan->curViop = &chan->viops[0];
        chan->nextViop = &chan->viops[1]; 
        for(i = 0; i < _VPORT_NUM_EDMA_CHANS; i ++) {
            Int optFld1 = EDMA_OPT_RMK(
                params->edmaPri,
                EDMA_OPT_ESIZE_32BIT,
                EDMA_OPT_2DS_NO,
                EDMA_OPT_SUM_NONE,
                EDMA_OPT_2DD_YES,
                EDMA_OPT_DUM_INC,
                EDMA_OPT_TCINT_NO,
                EDMA_OPT_TCC_OF(0), 
                EDMA_OPT_TCCM_OF(0),
                EDMA_OPT_ATCINT_NO,    
                EDMA_OPT_ATCC_DEFAULT,
                EDMA_OPT_PDTS_DISABLE,
                EDMA_OPT_PDTD_DISABLE,
                EDMA_OPT_LINK_YES,
                EDMA_OPT_FS_NO
            );
    
            Int optFld2a = EDMA_OPT_RMK(
                params->edmaPri,
                EDMA_OPT_ESIZE_32BIT,
                EDMA_OPT_2DS_NO,
                EDMA_OPT_SUM_NONE,
                EDMA_OPT_2DD_YES,
                EDMA_OPT_DUM_INC,
                (i == 0 ? EDMA_OPT_TCINT_YES:EDMA_OPT_TCINT_NO),
                EDMA_OPT_TCC_OF(i == 0 ? chan->tcc[0] & 0x0f : 0), 
                EDMA_OPT_TCCM_OF(i == 0 ? chan->tcc[0] >> 4 : 0),
                EDMA_OPT_ATCINT_NO,    
                EDMA_OPT_ATCC_DEFAULT,
                EDMA_OPT_PDTS_DISABLE,
                EDMA_OPT_PDTD_DISABLE,
                EDMA_OPT_LINK_YES,
                EDMA_OPT_FS_NO
            );
            Int optFld2b = EDMA_OPT_RMK(
                params->edmaPri,
                EDMA_OPT_ESIZE_32BIT,
                EDMA_OPT_2DS_NO,
                EDMA_OPT_SUM_NONE,
                EDMA_OPT_2DD_YES,
                EDMA_OPT_DUM_INC,
                (i == 0 ? EDMA_OPT_TCINT_YES:EDMA_OPT_TCINT_NO),
                EDMA_OPT_TCC_OF(i == 0 ? chan->tcc[1] & 0x0f : 0), 
                EDMA_OPT_TCCM_OF(i == 0 ? chan->tcc[1] >> 4 : 0),
                EDMA_OPT_ATCINT_NO,    
                EDMA_OPT_ATCC_DEFAULT,
                EDMA_OPT_PDTS_DISABLE,
                EDMA_OPT_PDTD_DISABLE,
                EDMA_OPT_LINK_YES,
                EDMA_OPT_FS_NO
            );

            thrld = (i == 0) ? chan->yThrld : chan->cThrld;
            cfgEdma.src = EDMA_SRC_RMK(chan->edmaAddr[i]);
            if(chan->mergeFlds) {
                /* to merge the two fields together */
                /* EDMA is configured to transfer only field 1 initially */
                /* line pitch is twice the line size */
                /* this requires that the threlhold is the same as line size */
                
                /* first field */
                cfgEdma.cnt = 
                  EDMA_CNT_RMK((chan->numEventsFld1) - 1, (thrld << 1));
                cfgEdma.idx = EDMA_IDX_RMK(thrld << 4, 0);
    
                /* hard code the first two frames as current and reload buffers */                
                /* first field */
                cfgEdma.rld = EDMA_RLD_RMK(0, chan->hRld[4 * i + 1]);
                cfgEdma.opt = optFld1;
                cfgEdma.dst = 
                  EDMA_DST_RMK(*((Int *)(&chan->viops[0].frame.iFrm.y1) + i));
                EDMA_config(chan->hEdma[i], &cfgEdma);
                EDMA_config(chan->hRld[4 * i], &cfgEdma); 
                cfgEdma.dst = 
                  EDMA_DST_RMK(*((Int *)(&chan->viops[1].frame.iFrm.y1) + i));
                cfgEdma.rld = EDMA_RLD_RMK(0, chan->hRld[4 * i + 3]);
                EDMA_config(chan->hRld[4 * i + 2], &cfgEdma);

                /* second field */
                cfgEdma.opt = optFld2a;
                cfgEdma.cnt = 
                  EDMA_CNT_RMK((chan->numEvents-chan->numEventsFld1) - 1, 
                   (thrld << 1));
                cfgEdma.dst = 
                  EDMA_DST_RMK(*((Int *)(&chan->viops[0].frame.iFrm.y2) + i));
                cfgEdma.rld = EDMA_RLD_RMK(0, chan->hRld[4 * i + 2]);
                EDMA_config(chan->hRld[4 * i + 1], &cfgEdma); 
                cfgEdma.opt = optFld2b;
                cfgEdma.dst = 
                  EDMA_DST_RMK(*((Int *)(&chan->viops[1].frame.iFrm.y2) + i));
                cfgEdma.rld = EDMA_RLD_RMK(0, chan->hRld[4 * i]);
                EDMA_config(chan->hRld[4 * i + 3], &cfgEdma);
                
            }else {/* if fields are not merged, configure EDMA to transfer */
                   /* for both field1 and field 2                          */
                   /* the line pitch is just the line size                 */
                cfgEdma.opt = optFld2a;
                cfgEdma.cnt = EDMA_CNT_RMK((chan->numEvents) - 1, (thrld << 1));
                cfgEdma.idx = EDMA_IDX_RMK(thrld << 3, 0);
                cfgEdma.rld = EDMA_RLD_RMK(0, chan->hRld[4 * i + 2]);
                /* hard code the first and second frame buffer as current  */
                /* and reload buffers */
                cfgEdma.dst = EDMA_DST_RMK(
                    *((Int *)(&chan->viops[0].frame.iFrm.y1) + i));
                EDMA_config(chan->hEdma[i], &cfgEdma);
                EDMA_config(chan->hRld[4 * i], &cfgEdma);

                cfgEdma.opt = optFld2b;
                cfgEdma.rld = EDMA_RLD_RMK(0, chan->hRld[4 * i]);
                cfgEdma.dst = EDMA_DST_RMK(
                    *((Int *)(&chan->viops[1].frame.iFrm.y1) + i));
                EDMA_config(chan->hRld[4 * i + 2], &cfgEdma);
            }
        }
        chan->nextEDMARlds = 1;        
        /* enable EDMA channel */
        /*
         * The EDMA interrupt dispatcher will be called by the
         * BIOS HWI interrupt dispatcher.
         */
        IRQ_map(IRQ_EVT_EDMAINT, params->irqId);
        HWI_dispatchPlug(params->irqId, (Fxn)EDMA_intDispatcher, -1, NULL);
        
        EDMA_intClear(chan->tcc[0]);
        EDMA_intHook(chan->tcc[0], captureEdmaISR);       
        EDMA_intEnable(chan->tcc[0]);
        EDMA_intClear(chan->tcc[1]);
        EDMA_intHook(chan->tcc[1], captureEdmaISR);       
        EDMA_intEnable(chan->tcc[1]);
        for(i = 0; i < _VPORT_NUM_EDMA_CHANS; i ++) {
            EDMA_disableChannel(chan->hEdma[i]);
            EDMA_clearChannel(chan->hEdma[i]);
            EDMA_enableChannel(chan->hEdma[i]);
        }    
        chan->status |= _VPORT_READY;
        IRQ_enable(IRQ_EVT_EDMAINT);
        
    }   
    return IOM_COMPLETED;

}

/*
 *  ======== _covrRecover ========
 *  force recover from FIFO over-run
 */
static Int _covrRecover(Ptr chanp)
{
    _VPORT_ChanObj* chan = (_VPORT_ChanObj* )chanp;
    PortObj* port = &portObjs[chan->portNum];
    volatile Int *base = (volatile Int *)port->base;
    volatile Int *cbase = (volatile Int *)chan->base;    
    Int numEvents;
    volatile Int i;                                            
    
    
    /* disable over-run interrupt */
    base[_VP_VPIE_OFFSET] &= ~(_VP_VPIE_COVRA_MASK<<(chan->chanNum*16));
    /* block capture events */
    cbase[_VP_VCACTL_OFFSETA] |= _VP_VCACTL_BLKCAP_MASK;

    /* Disable the edmas before settings them up */
    EDMA_intDisable(chan->tcc[0]);
    EDMA_intDisable(chan->tcc[1]);
    for(i = 0; i < _VPORT_NUM_EDMA_CHANS; i ++) {
        EDMA_disableChannel(chan->hEdma[i]);
        EDMA_clearChannel(chan->hEdma[i]);
    }
    if(chan->mergeFlds) {
        numEvents = chan->numEventsFld1;        
    } else {
        numEvents = chan->numEvents;
    }

    /* set up DMA parameters again */
    EDMA_RSETH(chan->hEdma[0], DST, chan->curViop->frame.iFrm.y1);
    EDMA_RSETH(chan->hEdma[1], DST, chan->curViop->frame.iFrm.cb1);
    EDMA_RSETH(chan->hEdma[2], DST, chan->curViop->frame.iFrm.cr1);
    EDMA_RSETH(chan->hEdma[0], CNT, EDMA_CNT_RMK(numEvents - 1, 
        (chan->yThrld << 1)));
    EDMA_RSETH(chan->hEdma[1], CNT, EDMA_CNT_RMK(numEvents - 1, 
        (chan->cThrld << 1)));
    EDMA_RSETH(chan->hEdma[2], CNT, EDMA_CNT_RMK(numEvents - 1, 
        (chan->cThrld<<1)));

    /* enable the edma events again before settings them up */
    EDMA_intEnable(chan->tcc[0]);
    EDMA_intEnable(chan->tcc[1]);
    for(i = 0;i < 3;i ++) {
        EDMA_enableChannel(chan->hEdma[i]);
    }
    /* delay */
    for(i = 0; i < 100000; i ++);

    /* clear any pending over-run interrupt */
    if(chan->chanNum == 0) {
        base[_VP_VPIS_OFFSET] |= _VP_VPIS_COVRA_MASK;
    }else {
        base[_VP_VPIS_OFFSET] |= _VP_VPIS_COVRB_MASK;
    }    
    /* enable event generation */
    cbase[_VP_VCACTL_OFFSETA] &= ~(_VP_VCACTL_BLKCAP_MASK);

    /* enable over-run interrupt */
    base[_VP_VPIE_OFFSET] |= _VP_VPIE_COVRA_MASK << (chan->chanNum * 16);

    return IOM_COMPLETED;
}


/*
 *  ======== _setVIntCb ========
 *  setup video port interrupt call-back
 */
static Int _setVIntCb(Ptr chanp, Ptr args)
{      
    _VPORT_ChanObj* chan = (_VPORT_ChanObj* )chanp;
    PortObj* port = &portObjs[chan->portNum];
    volatile Int *base = (volatile Int *)port->base;
    volatile Int *cBase = (volatile Int *)chan->base;
    VPORT_VIntCbParams* vIntCbParams = (void *)args;
    Int mask = vIntCbParams->vIntMask;
    Uns vif2 = 0, vInt2 = 0, vif1 = 0, vInt1 = 0, fscl2 = 0;
    
    
    /* check to see if vertical interrupt is enabled */
    if(mask & VPORT_INT_VINT1) {
        vif1 = 1;
        vInt1 = vIntCbParams->vIntLine;
    }
    if(mask & VPORT_INT_VINT2) {
        vif2 = 1;
        vInt2 = vIntCbParams->vIntLine;    
    }
    fscl2 = vif2 & (~ vif1);
    /* setup vertical interrupt */
    cBase[_VP_VCAVINT_OFFSETA] = VP_VCAVINT_RMK(vif2,fscl2, 
        vInt2, vif1, vInt1);
    
    if(chan->chanNum == 1) {
        mask <<= 16;    /* channel B */
    }
    chan->vIntMask = mask;
    if(mask) {
        mask |= 1; /* turn on video port interrupt */
        IRQ_map(IRQ_EVT_VINT0 + chan->portNum, vIntCbParams->irqId);    
        HWI_dispatchPlug(vIntCbParams->irqId, (Fxn)captureISR, -1, NULL);
        IRQ_disable(IRQ_EVT_VINT0 + chan->portNum);
        IRQ_clear(IRQ_EVT_VINT0 + chan->portNum);
    }
    base[_VP_VPIE_OFFSET] |= mask;  /* register write */    
    chan->vIntFxn = vIntCbParams->vIntCbFxn;    
    chan->vIntCbArg = vIntCbParams->cbArg;
    return IOM_COMPLETED;   
}      
static void _delay(Int delayTime)
{
    asm("loop1: BDEC loop1, A4");
    asm(" NOP 5");

}

/*
 *  ======== _startVPCapture ========
 *  start video port capture operation
 */
static Int _startVPCapture(Ptr chanp)
{
    _VPORT_ChanObj* chan = (_VPORT_ChanObj* )chanp;
    PortObj* port = &portObjs[chan->portNum];
    volatile Int *base = (volatile Int *)port->base;
    volatile Int *cbase = (volatile Int *)chan->base;    

    /* enable channel */
    cbase[_VP_VCACTL_OFFSETA] |= VP_VCACTL_VCEN_ENABLE << _VP_VCACTL_VCEN_SHIFT;

    _delay(20000000);
    /* clear the block capture event mask bit to enable */
    /* generating capture events                        */
    cbase[_VP_VCACTL_OFFSETA] &= ~ (_VP_VCACTL_BLKCAP_MASK);

    /* enable interrupt generation in video port level */
    base[_VP_VPIE_OFFSET] |= VP_VPIE_VIE_ENABLE << _VP_VPIE_VIE_SHIFT;
    base[_VP_VPIS_OFFSET] |= 0XFFFFFFFF;
    /* clear any pending video port interrupt */
    IRQ_clear(IRQ_EVT_VINT0 + chan->portNum);
    /* enable corresponding video port interrupt in chip-level*/
    IRQ_enable(IRQ_EVT_VINT0 + chan->portNum);
    
    return IOM_COMPLETED;
}

/*
 *  ======== _stopVPCapture ========
 *  stop video port capture operation
 */
static Int _stopVPCapture(Ptr chanp)
{
    _VPORT_ChanObj* chan = (_VPORT_ChanObj* )chanp;
    PortObj* port = &portObjs[chan->portNum];
    volatile Int *cbase = (volatile Int *)chan->base;    
    volatile Int *base = (volatile Int *)port->base;

    /* block events generation */
    cbase[_VP_VCACTL_OFFSETA] &= (_VP_VCACTL_BLKCAP_MASK);

    /* disable channel */
    cbase[_VP_VCACTL_OFFSETA] &= 
        ~ (VP_VCACTL_VCEN_ENABLE << _VP_VCACTL_VCEN_SHIFT);

    /* disable interrupt generation in video port level */
    base[_VP_VPIE_OFFSET] &= ~ (VP_VPIE_VIE_ENABLE << _VP_VPIE_VIE_SHIFT);
    base[_VP_VPIS_OFFSET] |= 0XFFFFFFFF;
    
    /* disble corresponding video port interrupt in chip-level*/
    IRQ_disable(IRQ_EVT_VINT0 + chan->portNum);

    /* clear any pending video port interrupt */
    IRQ_clear(IRQ_EVT_VINT0 + chan->portNum);
    
    EDMA_intDisable(chan->tcc[0]);
    EDMA_intClear(chan->tcc[0]);

    EDMA_intDisable(chan->tcc[1]);
    EDMA_intClear(chan->tcc[1]);

    return IOM_COMPLETED;
}



/*
 *  ======== captureISR ========
 */
static void captureISR(Int portNum)
{
    volatile Int *base =  
        (volatile Int *)portObjs[portNum].base;
    Int vpis = base[_VP_VPIS_OFFSET];
    Int mask = vpis;
    _VPORT_ChanObj* chanObjs = portObjs[portNum].chanObj;
        
    if(vpis & chanObjs[0].vIntMask && chanObjs[0].vIntFxn != INV) {
        chanObjs[0].vIntFxn(chanObjs[0].vIntCbArg, vpis);
        mask &=  chanObjs[0].vIntMask;
    }else if(vpis & chanObjs[1].vIntMask && chanObjs[1].vIntFxn != INV) {
        chanObjs[1].vIntFxn(chanObjs[1].vIntCbArg, (vpis >> 16));
        mask &=  chanObjs[1].vIntMask;
    }
    /* clear interrupts that has been handled */
    base[_VP_VPIS_OFFSET] |= mask;
}