fei82559end.c

Intel 82557 Ethernet network interface driver

	CFD_BYTE_WR (pCFD, CFD_THRESH_OFFSET, 
		     pDrvCtrl->board.tcbTxThresh);

	/* bump to the next CFD */

	pCFD = (CFD_ID) ((UINT32) pCFD + CFD_SIZE);
	}

    pCFD = (CFD_ID) ((UINT32) pCFD - CFD_SIZE);

    /* tie the last CFD to the first one */

    CFD_NEXT_WR (pCFD, ((UINT32) pDrvCtrl->pFreeCFD));

    /* set the used CFDs ring to the free one */

    pDrvCtrl->pUsedCFD = pDrvCtrl->pFreeCFD;

    /*
     * N.B.
     * Use RFD_C_EL to tie the end of the RBD ring, and not RFD_C_SUSP
     * This is because we want the option of inserting a new RFD into
     * the ring on the fly (i.e., via an SCB_RUSTART command).  Why would
     * we do this?  Buffer loaning....  A suspend/resume reception model
     * will not allow us to do this, so we must use an idle/start model.
     */

    /* initialize the RFD ring, some of the fields will be done 
     * in fei82557Start 
     */

    for (ix = 0; ix < pDrvCtrl->nRFDs; ix++)
	{
	volatile RFD_ID    pRFDOld;

	if ((pRFD = (RFD_ID) netClusterGet (pDrvCtrl->endObj.pNetPool,
					   pDrvCtrl->pClPoolId)) == NULL)
	    return (ERROR);

	if (firstRFD)
	    {
	    /* first ready RFD pointer */

	    pDrvCtrl->pRFD = pRFD;
	    firstRFD = FALSE;
	    }
	else
	    {
	    /* tie the previous RFD to the current one */

	    RFD_NEXT_WR (pRFDOld, (UINT32) pRFD);
	    RFD_LONG_WR (pRFD, RFD_PREV_OFFSET, (UINT32) pRFDOld);
	    }

	/* no RBDs used */

        RFD_RBD_WR (pRFD, (UINT32) RBD_NOT_USED);

	/* set the actual count field to zero */

        RFD_WORD_WR (pRFD, RFD_COUNT_OFFSET, 0);

	/* set the size field for Ethernet packets */

        RFD_WORD_WR (pRFD, RFD_SIZE_OFFSET,
		     (UINT32) (ETHERMTU + EH_SIZE));

	/* remember this RFD */

	pRFDOld = pRFD;
	}

    /* tie the last RFD to the first one */

    RFD_NEXT_WR ((UINT32) pRFD, (UINT32) pDrvCtrl->pRFD);

    /* link the first RFD to the last one */

    RFD_LONG_WR (pDrvCtrl->pRFD, RFD_PREV_OFFSET, (UINT32) pRFD);

    /* Flush the write pipe */

    CACHE_PIPE_FLUSH ();

    DRV_LOG (DRV_DEBUG_LOAD, ("fei82557InitMem... Done\n"),
				0, 0, 0, 0, 0, 0);

    return OK;
    }

/**************************************************************************
*
* fei82557Start - start the device
*
* This routine starts the 82557 device and brings it up to an operational
* state.  The driver must have already been attached with the fei82557Load()
* routine.
*
* RETURNS: OK, or ERROR if the device could not be initialized.
*/

LOCAL STATUS fei82557Start
    (
    DRV_CTRL *pDrvCtrl       /* pointer to DRV_CTRL structure */
    )

    {
    RFD_ID       pRFD;
    UINT32       tempVar;
    int		retVal;

    DRV_LOG (DRV_DEBUG_START, ("Starting end...\n"), 1, 2, 3, 4, 5, 6);

    /* must have been attached */

    if (!pDrvCtrl->attached)
	return (ERROR);

    /* reset the chip */

    if (fei82557Reset (pDrvCtrl) == ERROR)
	return (ERROR);

    /* connect the int handler */

    SYS_INT_CONNECT (pDrvCtrl, fei82557Int, (int) pDrvCtrl, &retVal);
    if (retVal == ERROR)
	return (ERROR);

    /* acknowledge interrupts */

    SYS_INT_ACK (pDrvCtrl);

    /* enable chip interrupts after fei82557Reset disabled them */

    I82557_INT_ENABLE;

    /* enable system interrupts after fei82557Reset disabled them */

    SYS_INT_ENABLE (pDrvCtrl);

    /* run diagnostics */

    if (fei82557Diag (pDrvCtrl) == ERROR)    
	return (ERROR);

    /* setup address */

    if (fei82557IASetup (pDrvCtrl) == ERROR)
	return (ERROR);

    if (END_FLAGS_ISSET (IFF_MULTICAST))
        FEI_FLAG_SET (FEI_MCAST);
 
    /* configure chip */

    if (fei82557Config (pDrvCtrl) == ERROR)
	return (ERROR);

    /* set some flags to default values */

    pDrvCtrl->rxHandle = FALSE;
    pDrvCtrl->txHandle = FALSE;
    pDrvCtrl->txStall = FALSE;

    /* get the current free RFD */

    RFD_GET (pRFD);

    /* initiailize RFD ring */

    do 
	{

	/* set state and command for this RFD */

	RFD_WORD_WR (pRFD, RFD_STAT_OFFSET, (UINT32) 0);
	RFD_WORD_WR (pRFD, RFD_COMM_OFFSET, (UINT32) 0);

	/* bump to the next RFD */

	RFD_NEXT_RD (pRFD, tempVar);
	pRFD = (RFD_ID) tempVar;

	} while (pRFD != pDrvCtrl->pRFD);

    /* mark the last RFD for the chip to became idle */

    RFD_LONG_RD (pRFD, RFD_PREV_OFFSET, tempVar);
    RFD_WORD_WR (tempVar, RFD_COMM_OFFSET, (UINT32) RFD_C_EL);

    /* Flush the write pipe */

    CACHE_PIPE_FLUSH ();

    /* put CU into suspended state */

    if (fei82557NOP (pDrvCtrl) == ERROR)
	return (ERROR);

    /* mark the interface as up */

    END_FLAGS_SET (&pDrvCtrl->endObj, (IFF_UP | IFF_RUNNING));

    /* startup the receiver */

    if (fei82557SCBCommand (pDrvCtrl, SCB_C_RUSTART, TRUE, pRFD)
	== ERROR)
	return (ERROR);

    DRV_LOG (DRV_DEBUG_START, ("Starting end... Done\n"), 1, 2, 3, 4, 5, 6);

    return (OK);

    }


/*******************************************************************************
* fei82557Send - send an Ethernet packet
*
* This routine() takes a M_BLK_ID and sends off the data in the M_BLK_ID.
* The buffer must already have the addressing information properly installed
* in it. This is done by a higher layer.
*
* muxSend() calls this routine each time it wants to send a packet.
*
* RETURNS: N/A
*/

LOCAL STATUS fei82557Send
    (
    DRV_CTRL *  pDrvCtrl,       /* pointer to DRV_CTRL structure */
    M_BLK * 	pMblk           /* pointer to the mBlk/cluster pair */
    )

    {
    volatile CFD_ID 	pCFD;
    volatile CFD_ID 	pPrevCFD;
    int			len = 0;
    volatile UINT16	command;
    volatile UINT16	status;
    char *		pEnetHdr;
    volatile UINT16	scbStatus;

    DRV_LOG (DRV_DEBUG_TX, ("fei82557Send...\n"), 1, 2, 3, 4, 5, 6);

    /* check device mode */

    if (FEI_FLAG_ISSET (FEI_POLLING))
        {
        return (ERROR);
        }

    /* check for CFDs availability */

    /* get the current free CFD */

    FREE_CFD_GET (pCFD);
 
    /* Make cache consistent with memory */

    FEI_CACHE_INVALIDATE (pCFD, 4);
 
    /* read the CFD status word */

    CFD_WORD_RD (pCFD, CFD_STAT_OFFSET, status);
 
    if (!(FD_FLAG_ISSET (status, (CFD_S_COMPLETE | CFD_S_OK))))
	{

	DRV_LOG (DRV_DEBUG_TX, ("fei82557Send...NO CFDS \n"), 1, 2, 3, 4, 5, 6);

#ifdef INCLUDE_MIBII_RFC2233
    if (pDrvCtrl->endObj.pMib2Tbl != NULL)
        {
        pDrvCtrl->endObj.pMib2Tbl->m2CtrUpdateRtn(pDrvCtrl->endObj.pMib2Tbl,
                                                  M2_ctrId_ifOutErrors, 1);
        }
#else
    END_ERR_ADD (&pDrvCtrl->endObj, MIB2_OUT_ERRS, +1);
#endif /* INCLUDE_MIBII_RFC2233 */

	/* set to stall condition */

	END_TX_SEM_TAKE (&pDrvCtrl->endObj, WAIT_FOREVER);
	pDrvCtrl->txStall = TRUE;
	END_TX_SEM_GIVE (&pDrvCtrl->endObj);

	return (END_ERR_BLOCK);

	}

    /* interlock with fei82557CFDFree */

    END_TX_SEM_TAKE (&pDrvCtrl->endObj, WAIT_FOREVER);

    pEnetHdr = (char *) (CFD_PKT_ADDR (pCFD));
    len = netMblkToBufCopy (pMblk, (char *) pEnetHdr, NULL);
    netMblkClChainFree (pMblk);

    len = max (ETHERSMALL, len); 

#ifdef INCLUDE_MIBII_RFC2233
    if (pDrvCtrl->endObj.pMib2Tbl != NULL)
        {
        pDrvCtrl->endObj.pMib2Tbl->m2PktCountRtn(pDrvCtrl->endObj.pMib2Tbl,
                                         M2_PACKET_OUT, (char *)pEnetHdr, len);
        }
#endif /* INCLUDE_MIBII_RFC2233 */

    /* set up the current CFD */

    CFD_WORD_WR (pCFD, CFD_COUNT_OFFSET, ((len & 0x3fff) | TCB_CNT_EOF));
    CFD_WORD_WR (pCFD, CFD_COMM_OFFSET, (CFD_C_XMIT | CFD_C_SUSP));
    CFD_WORD_WR (pCFD, CFD_STAT_OFFSET, 0);

    /* set the thresh value */

    CFD_BYTE_WR (pCFD, CFD_THRESH_OFFSET, 
		 pDrvCtrl->board.tcbTxThresh);

    /* no TBDs used */

    CFD_BYTE_WR (pCFD, CFD_NUM_OFFSET, 0);

    /* this is a transmit command */

    CFD_BYTE_WR (pCFD, CFD_ACTION_OFFSET, CFD_TX);

    /* tie to the previous CFD */

    CFD_LONG_RD (pCFD, CFD_PREV_OFFSET, pPrevCFD);
    CFD_WORD_RD (pPrevCFD, CFD_COMM_OFFSET, command);
    CFD_WORD_WR (pPrevCFD, CFD_COMM_OFFSET, (command & (~CFD_C_SUSP)));

    /* Flush the write pipe */

    CACHE_PIPE_FLUSH ();

    /* advance the current free CFD pointer */

    fei82557FDUpdate (pDrvCtrl, CFD_FREE);

#ifdef INCLUDE_MIBII_RFC2233
#else
    END_ERR_ADD (&pDrvCtrl->endObj, MIB2_OUT_UCAST, +1);
#endif /* INCLUDE_MIBII_RFC2233 */

    /* kick the CU if needed */

    /* read CSR status word */

    CSR_WORD_RD (CSR_STAT_OFFSET, scbStatus);

    if ((scbStatus & SCB_S_CUMASK) == SCB_S_CUSUSP)
	{

	if (fei82557SCBCommand (pDrvCtrl, SCB_C_CURESUME, FALSE,(UINT32) 0) 
	    == ERROR)
	    {
	    DRV_LOG (DRV_DEBUG_TX, ("Could not send packet\n"), 
				      1, 2, 3, 4, 5, 6);
	    return (ERROR);
	    }
	else
	    {
	    /* in the old driver ther was a second attempt 
	     * at transimitting the packet, but is it sensible?
	     */
	    }
	}

    /* interlock with fei82557CFDFree */

    END_TX_SEM_GIVE (&pDrvCtrl->endObj);

    DRV_LOG (DRV_DEBUG_TX, ("fei82557Send...Done\n"), 1, 2, 3, 4, 5, 6);

    return (OK);

    }

/*******************************************************************************
* fei82557Int - entry point for handling interrupts from the 82557
*
* The interrupting events are acknowledged to the device, so that the device
* will de-assert its interrupt signal.  The amount of work done here is kept
* to a minimum; the bulk of the work is deferred to the netTask.
*
* RETURNS: N/A
*/

LOCAL void fei82557Int
    (
    DRV_CTRL *  pDrvCtrl       /* pointer to DRV_CTRL structure */
    )

    {
    UINT16  event;
    UINT16  scbStatus;
    UINT16  scbCommand;

    /* read and save CSR status word */

    CSR_WORD_RD (CSR_STAT_OFFSET, event);

    if ((event & SCB_S_STATMASK) == 0)
	{
	/* This device was not the cause of the shared int */

	return;  
	}

    /* clear chip level interrupt pending, use byte access */

    CSR_BYTE_WR (CSR_ACK_OFFSET, ((event & SCB_S_STATMASK) >> 8));

    /* board level interrupt acknowledge */

    SYS_INT_ACK (pDrvCtrl);

    /* read CSR status word again */

    CSR_WORD_RD (CSR_STAT_OFFSET, scbStatus);

    DRV_LOG (DRV_DEBUG_INT, ("fei82557Int: event 0x%x, scbStatus 0x%x\n"), 
			     event, scbStatus, 0, 0, 0, 0);

    /* read CSR command word */

    CSR_WORD_RD (CSR_COMM_OFFSET, scbCommand);

    /* handle transmit interrupts */

    if ((event & SCB_S_CNA)  && (!((UINT8) (scbCommand >> 8) & SCB_C_M)) &&
	(!(pDrvCtrl->txHandle))) 
	{
	I82557_INT_DISABLE;

	pDrvCtrl->txHandle = TRUE;

	(void) netJobAdd ((FUNCPTR) fei82557CFDFree, (int) pDrvCtrl,
			  0, 0, 0, 0);
	}

    /* handle receive interrupts only if fei82557Receive is not running */

    if ((event & SCB_S_FR) && !((UINT8) (scbCommand >> 8) & SCB_C_M)
	&& !(pDrvCtrl->rxHandle))
	{

	I82557_INT_DISABLE;