sysepic.c

这是WINDRIVER公司所开发的针对freescale公司最新的powerpc系列MPC8560的针对vxworks的bsp。对做powerpc嵌入式的很有用了。

*
* epicVecOptionsSet - set options for a vector
*
* <srcAddr> is the address offset of the Vector Priority register
* <mask> is one of EPIC_OPT_EN_MSK, EPIC_OPT_POLAR_MSK, EPIC_OPT_SENSE_MSK,
*                  EPIC_OPT_PRI_MSK, EPIC_OPT_EXPIN_MSK, EPIC_OPT_CRIT_MSK
* <options> is one of 
*   EPIC_OPT_EN_Y              interrupt enabled
*   EPIC_OPT_EN_N              interrupt disabled
*   EPIC_OPT_POLAR_ACT_LOW     polarity is active low
*   EPIC_OPT_POLAR_ACT_HIGH    polarity is active high
*   EPIC_OPT_POLAR_EDG_NEG     polarity is negative edge triggered
*   EPIC_OPT_POLAR_EDG_POS     polarity is positive edge triggered
*   EPIC_OPT_SENSE_EDG         edge sensitive
*   EPIC_OPT_SENSE_LVL         level sensitive
*   EPIC_OPT_PRI_VALUE(p)      set priority to p [0..15]
*   EPIC_OPT_EXPIN_OFF         external pin off
*   EPIC_OPT_EXPIN_ON          external pin on
*   EPIC_OPT_CRIT_OFF          route to critical pin off
*   EPIC_OPT_CRIT_ON           route to critical pin on
*
* NOMANUAL
*
* RETURNS: OK or an error code, can be one of the following:
*          OK
*          ERROR
*          EPIC_VEC_OPTION_INV
*          EPIC_INV_INTER_SOURCE
*          EPIC_VEC_OPTION_NA
*          EPIC_VEC_HAS_NO_IDR
*          EPIC_INTER_IN_SERVICE
*/

LOCAL int epicVecOptionsSet
    (
    ULONG       srcAddr,
    UINT32 	mask,
    UINT32 	options
    )
    {
    ULONG       vprVal;
    ULONG       idrVal;
    ULONG       vprFlag;
    ULONG       idrFlag;
    int         errCode;
    int         idrOffset = 0;              /* offset of IDR from VPR */

    if ((mask & ((0x3f30 << 16) | (0x3fff))) != 0)
        return (EPIC_VEC_OPTION_INV);

    errCode = epicSrcAddrCheck (srcAddr);

    if (errCode == EPIC_INV_INTER_SOURCE)
        {
        return (errCode);
        }

    vprFlag = mask & 0xffff0000;            /* upper sets upper VPR */
    idrFlag = (mask & 0x0000ffff) << 16;    /* lower sets upper IDR */

    switch (errCode)
        {
        case EPIC_EX_INTERRUPT:
            idrOffset = EPIC_EX_DEST_REG_VECREGOFF;
        break;

        case EPIC_IN_INTERRUPT:
            idrOffset = EPIC_IN_DEST_REG_VECREGOFF;
            if ((vprFlag & EPIC_OPT_SENSE_MSK) != 0)
                return (EPIC_VEC_OPTION_NA);
        break;

        case EPIC_GT_INTERRUPT:
            if (idrFlag != 0)
                return (EPIC_VEC_HAS_NO_IDR);
        break;

        case EPIC_MSG_INTERRUPT:
            idrOffset = EPIC_MSG_DEST_REG_VECREGOFF;
            if ((vprFlag & (EPIC_OPT_POLAR_MSK | EPIC_OPT_SENSE_MSK)) != 0)
                return (EPIC_VEC_OPTION_NA);
        break;

        case EPIC_IPI_INTERRUPT:
            if (idrFlag != 0)
                return (EPIC_VEC_HAS_NO_IDR);
        break;

        default:
            return (ERROR);
        }

    vprVal = sysEpicRegRead (srcAddr);

    if ((vprVal & EPIC_EIVPR_INTR_ACTIVE) != 0)
        return (EPIC_INTER_IN_SERVICE);

    if (vprFlag != 0)
        {
        vprVal &= ~(vprFlag);
        vprVal |= (options & 0xffff0000);
        sysEpicRegWrite (srcAddr, vprVal);
        }

    if ((idrFlag != 0) && (idrOffset != 0))
        {
        idrVal = sysEpicRegRead (srcAddr + idrOffset);
        idrVal &= ~(idrFlag);
        idrVal |= (options & 0xffff) << 16;
        sysEpicRegWrite (srcAddr + idrOffset, idrVal);
        }

    return OK;

    }

/*******************************************************************************
*
* epicVecOptionsGet - get options for a vector
*
* <srcAddr> is the address offset of the Vector Priority register
*
* Use one or more of the following masks to extract the returned value:
*   EPIC_OPT_EN_MSK
*   EPIC_OPT_POLAR_MSK
*   EPIC_OPT_SENSE_MSK
*   EPIC_OPT_PRI_MSK
*   EPIC_OPT_EXPIN_MSK
*   EPIC_OPT_CRIT_MSK
*
* NOMANUAL
*
* RETURNS: OK, ERROR, or EPIC_INV_INTER_SOURCE
*/

LOCAL UINT32 epicVecOptionsGet
    (
    ULONG       srcAddr
    )
    {
    ULONG       vprVal;
    ULONG       idrVal;
    int         errCode;
    int         idrOffset = 0;              /* offset of IDR from VPR */

    errCode = epicSrcAddrCheck (srcAddr);

    if (errCode == EPIC_INV_INTER_SOURCE)
        {
        return (errCode);
        }

    switch (errCode)
        {
        case EPIC_EX_INTERRUPT:
            idrOffset = EPIC_EX_DEST_REG_VECREGOFF;
        break;

        case EPIC_IN_INTERRUPT:
            idrOffset = EPIC_IN_DEST_REG_VECREGOFF;
        break;

        case EPIC_GT_INTERRUPT:
        break;

        case EPIC_MSG_INTERRUPT:
            idrOffset = EPIC_MSG_DEST_REG_VECREGOFF;
        break;

        case EPIC_IPI_INTERRUPT:
        break;

        default:
            return ((UINT32) ERROR);
        }

    vprVal = sysEpicRegRead (srcAddr);
    if (idrOffset != 0)
        idrVal = sysEpicRegRead (srcAddr + idrOffset);
    else
        idrVal = 0;

    return ((vprVal & 0xffff0000) | (idrVal >> 16));
    }

/*******************************************************************************
*
* sysEpicVecOptionsSet - change options for a vector
*
*/

int sysEpicVecOptionsSet
    (
    int    vector,
    UINT32 mask,
    UINT32 options
    )
    {
    if ((vector < 0) || (vector >= EPIC_MAX_ALL_IRQS))
        return (ERROR);

    /* set vector options on EPIC */

    return epicVecOptionsSet ( epicGetVecRegAdrs (vector), mask, options );
    }

/*******************************************************************************
*
* sysEpicVecOptionsGet - obtain options for a vector
*
*/

UINT32 sysEpicVecOptionsGet
    (
    int vector
    )
    {
    if ((vector < 0) || (vector >= EPIC_MAX_ALL_IRQS))
        return ((UINT32) ERROR);

    /* get vector options on EPIC */

    return epicVecOptionsGet ( epicGetVecRegAdrs (vector) );
    }

/*******************************************************************************
*
* sysEpicIntConnect - connect an interrupt handler to the system vector table
*
* This function connects an interrupt handler to the system vector table.
*
* RETURNS: OK or ERROR.
*/

STATUS sysEpicIntConnect
    (
    VOIDFUNCPTR * 	vector,		/* interrupt vector to attach */
    VOIDFUNCPTR		routine,	/* routine to be called */
    int			parameter	/* parameter to be passed to routine */
    )
    {
    INT_HANDLER_DESC *	pNewHandler;
    INT_HANDLER_DESC *	pCurrHandler;
    int			intVal;
    BOOL		sharing = FALSE;

    if (((int)vector < 0)  || ((int) vector >= INTERRUPT_TABLESIZE)) 
	{
        return (ERROR);   /*  out of range  */
	}

    /* create a new interrupt handler */

    pNewHandler = malloc (sizeof (INT_HANDLER_DESC));

    /* check if the memory allocation succeed */

    if (pNewHandler == NULL)

	return (ERROR);

    /*  initialize the new handler  */

    pNewHandler->vec = routine;
    pNewHandler->arg = parameter;
    pNewHandler->next = NULL;

    /* install the handler in the system interrupt table  */

    intVal = intLock (); /* lock interrupts to prevent races */

    if (sysIntTbl [(int) vector] == NULL)
	{
        sysIntTbl [(int) vector] = pNewHandler;  /* single int. handler case */
	}
    else
	{
        pCurrHandler = sysIntTbl[(int) vector];/* multiple int. handler case */

        while (pCurrHandler->next != NULL)
            {
            pCurrHandler = pCurrHandler->next;
            }
        
        pCurrHandler->next = pNewHandler;

        sharing = TRUE;
	}

    if ((int)vector >= 0 && (int)vector < EPIC_MAX_ALL_IRQS)
        {

        /* EPIC IRQ set EPIC registers */

        if (!sharing)
            {
            if ((int) vector < EPIC_VEC_IN_IRQ0)        /* EX type */
                {
                epicIntSourceSet ( epicGetVecRegAdrs ((int) vector),
                               EPIC_EX_DFT_POLAR, EPIC_EX_DFT_SENSE,
                               EPIC_PRIORITY_DEFAULT, (int) vector);
                }
            else if ((int) vector < EPIC_VEC_GT_IRQ0)   /* IN type */
                {
                epicIntSourceSet ( epicGetVecRegAdrs ((int) vector),
                               EPIC_IN_DFT_POLAR, 0x0,
                               EPIC_PRIORITY_DEFAULT, (int) vector);
                }
            else                                        /* other types */
                {
                epicIntSourceSet ( epicGetVecRegAdrs ((int) vector),
                               0x0, 0x0,
                               EPIC_PRIORITY_DEFAULT, (int) vector);
                }
            }
        }

    intUnlock (intVal);

    return (OK);
    }

/*******************************************************************************
*
* sysEpicIntHandlerExec  - execute the handlers for a given vector
* 
* This routine executes all the handlers chained to a given vector.
* If a vector has no handlers attached to it, a logMsg is generated.
*
* NOMANUAL
*
* RETURNS: N/A
*
*/

LOCAL void sysEpicIntHandlerExec
    (
    int vector
    )
    {    
    INT_HANDLER_DESC * pCurrHandler;

    /*  call each respective interrupt handler */	

    if ((pCurrHandler = sysIntTbl [vector]) == NULL)
        {
	logMsg ("uninitialized PIC interrupt vector 0x%x\r\n",
                vector, 0,0,0,0,0);
        }
    else
        {

#if FALSE	/* test for working of serial console */
        if (vector != 0x26)
            logMsg ("epic vector = 0x%x\n", vector);
#endif

	/* call Each respective chained interrupt handler  */
	while (pCurrHandler != NULL)
            {
  	    (*pCurrHandler->vec) (pCurrHandler->arg);
	    pCurrHandler = pCurrHandler->next;
            }

        }
    }

/*******************************************************************************
*
* sysEpicIntHandler - handles the EPIC interrupts to the CPU
*
* This routine handles interrupts originating from the embedded interrupt
* controller on the MPC8540 PowerPC processor.
* This handler is entered from the 0x500 exception.
*
* This routine is entered with CPU external interrupts enables.
*
* Since the EPIC is the primary interrupt controller this driver
* first initiates an Epic acknowledge call and reads the vector
* put out by the EPIC. Subsequent vectors have to be obtained if
* an external interrupt controller is connected to one of the
* epic handlers. 
*
* This routine then processes the interrupt by calling all the interrupt
* service routines chained to the vector.
*
* Finally, this routine re-arms the interrupt at the PIC by performing an 
* PIC EOI for both the EPIC and the 8259s.
*
* RETURNS:  N/A
*
*/

LOCAL void  sysEpicIntHandler (void)
    {
    int	epicIntVec;
    int oldkey;

    epicIntVec = epicIntAck ();	/* clear int, return the vec for highest IRQ */

#ifdef INCLUDE_WINDVIEW
    WV_EVT_INT_ENT (epicIntVec);
#endif 

    /* loop till all interrupts are cleared */
    while (epicIntVec != 0xffff)
        {

    #if FALSE
        /* block all lower priority interrupts */

        if ((oldLevel = epicCurTaskPrioSet (epicIntVec)) == EPIC_INV_PRIO_ERROR)
            {
            return;
            }
    #endif

        /* Allow external interrupts to the CPU. */

	CPU_INT_UNLOCK (_PPC_MSR_EE);
        sysEpicIntHandlerExec (epicIntVec);
	CPU_INT_LOCK (&oldkey);

        /*
         * Disable External Interrupts
         * External Interrupts will be re-enabled in the kernel's wrapper
         * of this Interrupt.
         */


        WRS_ASM ("sync");
        epicEOI();			/* signal end of interrupt on EPIC */
        WRS_ASM ("sync");

        epicIntVec = epicIntAck ();

    #if FALSE
        epicCurTaskPrioSet (oldLevel); 	/* Allow the next interrupt to occur */
    #endif

        } /* while */

    }

#ifdef INCLUDE_EPIC_CRT_INTR
/***************************************************************************
*
* epicCisr0Get - get critical interrupt summary
*