if_cpm.c

IXP425的BSP代码

        loanBuf = cacheDmaMalloc (loanNum * pDrvCtrl->ether.rxBufSize);
	if (loanBuf == NULL)
            pDrvCtrl->nLoanRxBd = 0;
        }
    else
	{
	/* use passed in address as memory pool - assume OK */

	txBuf   = bufBase;
	rxBuf   = (UINT8 *) (txBuf + (txBdNum * pDrvCtrl->ether.txBufSize));
	loanBuf = (UINT8 *) (rxBuf + (rxBdNum * pDrvCtrl->ether.rxBufSize));
	}

    /* assign buffer addresses */

    for (counter = 0; counter < txBdNum; counter++)
        pDrvCtrl->ether.txBdBase[counter].dataPointer = (txBuf + (counter *
	    pDrvCtrl->ether.txBufSize));

    for (counter = 0; counter < rxBdNum; counter++)
        pDrvCtrl->ether.rxBdBase[counter].dataPointer = (rxBuf + (counter *
	    pDrvCtrl->ether.rxBufSize));

    for (counter = 0; counter < pDrvCtrl->nLoanRxBd; counter++)
        {
        pDrvCtrl->lPool[counter] = (loanBuf + (counter *
				    pDrvCtrl->ether.rxBufSize));
        pDrvCtrl->refCnt[counter] = 0;
	pDrvCtrl->pRefCnt[counter] = & pDrvCtrl->refCnt[counter];
        }

    /* reset the chip */

    if (cpmReset (unit) == ERROR)
        return (ERROR);

    /* connect the interrupt handler cpmIntr() */

    if (intConnect (ivec, (VOIDFUNCPTR) cpmIntr, unit) == ERROR)
        return (ERROR);

    /* Initialize and start controller */

    cpmInit (unit);

    /* mark driver as attached */

    pDrvCtrl->attached = TRUE;

    return (OK);
    }

/*******************************************************************************
*
* cpmInit - network interface initialization routine
*
* This routine marks the interface as down, then configures and initializes
* the chip.  It sets up the transmit and receive buffer descriptor (BD)
* rings, initializes registers, and enables interrupts.  Finally, it marks
* the interface as up and running.  It does not touch the receive loaner
* buffer stack.
*
* The complement of this routine is cpmReset().  Once a unit is reset by
* cpmReset(), it may be re-initialized to a running state by this routine.
*
* RETURNS: OK if successful, otherwise ERROR.
*/

LOCAL STATUS cpmInit
    (
    int		unit		/* unit number */
    )
    {
    DRV_CTRL *	pDrvCtrl;
    UINT8	enetAddr[ENET_ADDR_SIZE];
    int		counter;

    /* sanity check the unit number */

    if (unit < 0 || unit >= MAX_UNITS)
	 return (ERROR);

    pDrvCtrl = & drvCtrl[unit];

    /* mark the device as down */
 
    pDrvCtrl->idr.ac_if.if_flags &= ~(IFF_UP | IFF_RUNNING);

    /* initialize flag(s) */

    pDrvCtrl->txStop = FALSE;

    /* set up transmit buffer descriptors */

    pDrvCtrl->ether.pScc->param.tbase = (UINT16)
	((UINT32) pDrvCtrl->ether.txBdBase & 0xfff);
    pDrvCtrl->ether.pScc->param.tbptr = (UINT16)
	((UINT32) pDrvCtrl->ether.txBdBase & 0xfff);

    pDrvCtrl->ether.txBdNext  = 0;

    /* initialize each transmit buffer descriptor */
     
    for (counter = 0; counter < pDrvCtrl->ether.txBdNum; counter++)
        pDrvCtrl->ether.txBdBase[counter].statusMode = SCC_ETHER_TX_BD_I |
                                                       SCC_ETHER_TX_BD_PAD |
                                                       SCC_ETHER_TX_BD_L |
                                                       SCC_ETHER_TX_BD_TC;

    /* set the last BD to wrap to the first */

    pDrvCtrl->ether.txBdBase[(counter - 1)].statusMode |= SCC_ETHER_TX_BD_W;

    /* set up receive buffer descriptors */

    pDrvCtrl->ether.pScc->param.rbase = (UINT16)
	((UINT32) pDrvCtrl->ether.rxBdBase & 0xfff);
    pDrvCtrl->ether.pScc->param.rbptr = (UINT16)
	((UINT32) pDrvCtrl->ether.rxBdBase & 0xfff);

    pDrvCtrl->ether.rxBdNext  = 0;

    /* initialize each receive buffer descriptor */

    for (counter = 0; counter < pDrvCtrl->ether.rxBdNum; counter++)
        pDrvCtrl->ether.rxBdBase[counter].statusMode = SCC_ETHER_RX_BD_I |
        					       SCC_ETHER_RX_BD_E;

    /* set the last BD to wrap to the first */

    pDrvCtrl->ether.rxBdBase[(counter - 1)].statusMode |= SCC_ETHER_RX_BD_W;

    /* set SCC attributes to Ethernet mode */
 
    pDrvCtrl->ether.pSccReg->gsmrl    = SCC_GSMRL_ETHERNET | SCC_GSMRL_TPP_10 |
                                        SCC_GSMRL_TPL_48   | SCC_GSMRL_TCI;
    pDrvCtrl->ether.pSccReg->gsmrh    = 0x0;

    pDrvCtrl->ether.pSccReg->psmr     = SCC_ETHER_PSMR_CRC |
					SCC_ETHER_PSMR_NIB_22;
 
    if (pDrvCtrl->idr.ac_if.if_flags & IFF_PROMISC)
        pDrvCtrl->ether.pSccReg->psmr |= SCC_ETHER_PSMR_PRO;
 
    pDrvCtrl->ether.pSccReg->dsr      = 0xd555;
    pDrvCtrl->ether.pScc->param.rfcr  = 0x18;      /* supervisor data access */
    pDrvCtrl->ether.pScc->param.tfcr  = 0x18;      /* supervisor data access */
    pDrvCtrl->ether.pScc->param.mrblr = FRAME_MAX_AL;  /* max rx buffer size */

    /* initialize parameter the SCC RAM */
 
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->c_pres	= 0xffffffff;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->c_mask	= 0xdebb20e3;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->crcec	= 0x00000000;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->alec	= 0x00000000;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->disfc	= 0x00000000;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->pads	= 0x8888;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->ret_lim	= 0x000f;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->mflr	= FRAME_MAX;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->minflr	= FRAME_MIN;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->maxd1	= FRAME_MAX;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->maxd2	= FRAME_MAX;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->gaddr1	= 0x0000;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->gaddr2	= 0x0000;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->gaddr3	= 0x0000;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->gaddr4	= 0x0000;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->p_per	= 0x0000;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->iaddr1	= 0x0000;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->iaddr2	= 0x0000;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->iaddr3	= 0x0000;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->iaddr4	= 0x0000;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->taddr_h	= 0x0000;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->taddr_m	= 0x0000;
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->taddr_l	= 0x0000;

    /* set the hardware Ethernet address of the board */

    if (sysCpmEnetAddrGet (unit, (UINT8 *) & enetAddr) == ERROR)
	return (ERROR);

    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->paddr1_h =
        (enetAddr[5] << 8) + enetAddr[4];
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->paddr1_m =
        (enetAddr[3] << 8) + enetAddr[2];
    ((SCC_ETHER_PROTO *)pDrvCtrl->ether.pScc->prot)->paddr1_l =
        (enetAddr[1] << 8) + enetAddr[0];

    bcopy ((char *) enetAddr, (char *) pDrvCtrl->idr.ac_enaddr, ENET_ADDR_SIZE);

    /* enable Ethernet interrupts */

    pDrvCtrl->ether.pSccReg->scce = 0xffff;		/* clr events */

    pDrvCtrl->ether.pSccReg->sccm = SCC_ETHER_SCCX_RXF | SCC_ETHER_SCCX_TXE;

    sysCpmEnetIntEnable (unit);				/* unmask interrupts */

    /* call the BSP to do any other initialization (e.g., connecting clocks) */

    if (sysCpmEnetEnable (unit) == ERROR)
	return (ERROR);

    /* raise the interface flags - mark the device as up */
 
    pDrvCtrl->idr.ac_if.if_flags |= IFF_UP | IFF_RUNNING | IFF_NOTRAILERS;

    /* enable the transmitter */

    pDrvCtrl->ether.pSccReg->gsmrl |= SCC_GSMRL_ENT;

    /* issue the restart transmitter command to the CP */

    (void) sysCpmEnetCommand (unit, CPM_CR_SCC_RESTART);

    /* enable the receiver */

    pDrvCtrl->ether.pSccReg->gsmrl |= SCC_GSMRL_ENR;

    return (OK);
    }

#ifdef BSD43_DRIVER
/*******************************************************************************
*
* cpmOutput - network interface output routine
*
* This routine simply calls ether_output(). ether_output() resolves 
* the hardware addresses and calls cpmStartOutput() with the unit number
* passed as an argument.
*
* RETURNS: OK if successful, otherwise errno.
*/

LOCAL int cpmOutput
    (
    IFNET *	pIfNet,		/* pointer to IFNET structure */
    MBUF *	pMbuf,		/* mbuf chain for output */
    SOCK *	pSock		/* sock ptr for destination */  
    )
    {
    DRV_CTRL * pDrvCtrl = & drvCtrl[pIfNet->if_unit];

    return (ether_output (pIfNet, pMbuf, pSock, (FUNCPTR) cpmStartOutput,
	    & pDrvCtrl->idr));
    }
#endif

/*******************************************************************************
*
* cpmStartOutput - output packet to network interface device
*
* cpmStartOutput() takes a packet from the network interface output queue,
* copies the mbuf chain into an interface buffer, and sends the packet over
* the interface.  etherOutputHookRtns are supported.
*
* Collision stats are collected in this routine from previously sent BDs.
* These BDs will not be examined until after the transmitter has cycled the
* ring, coming upon the BD after it has been sent. Thus, collision stat
* collection will be delayed a full cycle through the Tx ring.
*
* This routine is called from several possible threads.  Each one will be
* described below.
*
* The first, and most common thread, is when a user task requests the
* transmission of data. Under BSD 4.3, this will cause cpmOutput() to be
* called, which calls ether_output(), which usually calls this routine. 
* This routine will not be called if ether_output() finds that our interface
* output queue is full. In this very rare case, the outgoing data will be 
* thrown out. BSD 4.4 uses a slightly different model in which the generic
* ether_output() routine is called directly, followed by a call to this
* routine.
*
* The second thread is when a transmitter error occurs that causes a
* TXE event interrupt.  This happens for the following errors: transmitter
* underrun, retry limit reached, late collision, and heartbeat error.
* The ISR sets the txStop flag to stop the transmitter until the errors are
* serviced. These events require a RESTART command of the transmitter, which
* occurs in the cpmTxRestart() routine.  After the transmitter is restarted,
* cpmTxRestart() does a netJobAdd of cpmStartOutput() to send any packets
* left in the interface output queue.  Thus, the second thread executes
* in the context of netTask().
*
* The third, and most unlikely, thread occurs when this routine is executing
* and it runs out of free Tx BDs.  In this case, this routine turns on
* transmit interrupt and exits.  When the next BD is actually sent, an interrupt
* occurs.  The ISR does a netJobAdd of cpmStartOutput() to continue sending
* packets left in the interface output queue.  Once again, we find ourselves
* executing in the context of netTask().
*
* RETURNS: N/A
*/

#ifdef BSD43_DRIVER
LOCAL void cpmStartOutput
    (
    int		unit		/* unit number */
    )
    {
    DRV_CTRL *	pDrvCtrl = & drvCtrl[unit];
#else
LOCAL void cpmStartOutput
    (
    DRV_CTRL * 	pDrvCtrl	/* driver control structure */
    )
    {
#endif
    MBUF *	pMbuf;		/* mbuf pointer */
    int		length;
    SCC_BUF *	pTxBd;
    UINT8 *	pad;

    /*
     * Loop until:
     *     a) there are no more packets ready to send
     *     b) we have insufficient resources left to send another one
     *     c) a fatal transmitter error occurred, thus txStop was set
     */

    while (!pDrvCtrl->txStop && (pDrvCtrl->idr.ac_if.if_snd.ifq_head != NULL))
        {
	pTxBd = & pDrvCtrl->ether.txBdBase[pDrvCtrl->ether.txBdNext];

	/* check if a transmit buffer descriptor is available */

        if (pTxBd->statusMode & SCC_ETHER_TX_BD_R)
	    {
	    /* if no BD available, enable interrupt to see when one is free */

            pDrvCtrl->ether.pSccReg->scce = SCC_ETHER_SCCX_TXB;
            pDrvCtrl->ether.pSccReg->sccm |= SCC_ETHER_SCCX_TXB;
	    break;
	    }

        IF_DEQUEUE (& pDrvCtrl->idr.ac_if.if_snd, pMbuf); /* dequeue a packet */

        copy_from_mbufs (pTxBd->dataPointer, pMbuf, length);

        /* padding mechanism in Rev A is buggy - do in software */

        if (length < FRAME_MIN)
            {
            pad = pTxBd->dataPointer + length;
            for (; length != FRAME_MIN; length++, pad++)
                *pad = 0x88;
            }

        /* call hook if one is connected */

        if ((etherOutputHookRtn == NULL) || ((* etherOutputHookRtn)
	    (& pDrvCtrl->idr.ac_if, pTxBd->dataPointer, length) == 0))
            {
	    /* add in collision stats from previously sent BDs */

            pDrvCtrl->idr.ac_if.if_collisions += ((pTxBd->statusMode &
					          SCC_ETHER_TX_BD_RC) >> 2);

	    /* if hook did not grab the frame, send packet */

            pTxBd->dataLength = length;
            if (pTxBd->statusMode & SCC_ETHER_TX_BD_W)
                pTxBd->statusMode = SCC_ETHER_TX_BD_I | SCC_ETHER_TX_BD_PAD |
                                    SCC_ETHER_TX_BD_L | SCC_ETHER_TX_BD_TC  |
                                    SCC_ETHER_TX_BD_W | SCC_ETHER_TX_BD_R;
	    else
                pTxBd->statusMode = SCC_ETHER_TX_BD_I | SCC_ETHER_TX_BD_PAD |
                                    SCC_ETHER_TX_BD_L | SCC_ETHER_TX_BD_TC  |
                                    SCC_ETHER_TX_BD_R;

            /* incr BD count */

	    pDrvCtrl->ether.txBdNext = (pDrvCtrl->ether.txBdNext + 1) %
				        pDrvCtrl->ether.txBdNum;

#ifndef BSD43_DRIVER    /* BSD 4.4 ether_output() doesn't bump statistic. */
            pDrvCtrl->idr.ac_if.if_opackets++;
#endif
            }
        }
    }

/*******************************************************************************
*
* cpmIoctl - network interface control routine
*
* This routine implements the network interface control functions.
* It handles SIOCSIFADDR and SIOCSIFFLAGS commands.
*
* RETURNS: OK if successful, otherwise EINVAL.
*/

LOCAL int cpmIoctl
    (
    IFNET *	pIfNet,		/* pointer to IFNET structure */
    int		cmd,		/* command to process */
    caddr_t	data		/* pointer to data */ 
    )
    {
    DRV_CTRL * pDrvCtrl = & drvCtrl[pIfNet->if_unit];
    int         error   = 0;            /* error value */
    int         s       = splimp ();    /* sem not taken in calling functions */

    switch (cmd)
        {
        case SIOCSIFADDR:       /* set interface address */
            ((struct arpcom *)pIfNet)->ac_ipaddr = IA_SIN (data)->sin_addr;
            arpwhohas (pIfNet, &IA_SIN (data)->sin_addr);
            break;
    
        case SIOCSIFFLAGS:
	    /* set promiscuous bit according to flags */

	    if (pDrvCtrl->idr.ac_if.if_flags & IFF_PROMISC)
                pDrvCtrl->ether.pSccReg->psmr |= SCC_ETHER_PSMR_PRO;
            else
                pDrvCtrl->ether.pSccReg->psmr &= ~SCC_ETHER_PSMR_PRO;

            break;