3c90x.c

i386的bootloader源码grub

    INF_3C90X.ReceiveUPD.DataLength = 1536 + (1<<31);

    /** Submit the upload descriptor to the NIC **/
    outl(virt_to_bus(&(INF_3C90X.ReceiveUPD)),
         INF_3C90X.IOAddr + regUpListPtr_l);

    /** Wait for upload completion (upComplete(15) or upError (14)) **/
    for(i=0;i<40000;i++);
    while((INF_3C90X.ReceiveUPD.UpPktStatus & ((1<<14) | (1<<15))) == 0)
	for(i=0;i<40000;i++);

    /** Check for Error (else we have good packet) **/
    if (INF_3C90X.ReceiveUPD.UpPktStatus & (1<<14))
	{
	errcode = INF_3C90X.ReceiveUPD.UpPktStatus;
	if (errcode & (1<<16))
	    printf("3C90X: Rx Overrun (%hX)\n",errcode>>16);
	else if (errcode & (1<<17))
	    printf("3C90X: Runt Frame (%hX)\n",errcode>>16);
	else if (errcode & (1<<18))
	    printf("3C90X: Alignment Error (%hX)\n",errcode>>16);
	else if (errcode & (1<<19))
	    printf("3C90X: CRC Error (%hX)\n",errcode>>16);
	else if (errcode & (1<<20))
	    printf("3C90X: Oversized Frame (%hX)\n",errcode>>16);
	else
	    printf("3C90X: Packet error (%hX)\n",errcode>>16);
	return 0;
	}

    /** Ok, got packet.  Set length in nic->packetlen. **/
    nic->packetlen = (INF_3C90X.ReceiveUPD.UpPktStatus & 0x1FFF);

    return 1;
    }



/*** a3c90x_disable: exported routine to disable the card.  What's this for?
 *** the eepro100.c driver didn't have one, so I just left this one empty too.
 *** Ideas anyone?
 *** Must turn off receiver at least so stray packets will not corrupt memory
 *** [Ken]
 ***/
static void
a3c90x_disable(struct nic *nic)
    {
	/* Disable the receiver and transmitter. */
	outw(cmdRxDisable, INF_3C90X.IOAddr + regCommandIntStatus_w);
	outw(cmdTxDisable, INF_3C90X.IOAddr + regCommandIntStatus_w);
    }



/*** a3c90x_probe: exported routine to probe for the 3c905 card and perform
 *** initialization.  If this routine is called, the pci functions did find the
 *** card.  We just have to init it here.
 ***/
struct nic*
a3c90x_probe(struct nic *nic, unsigned short *probeaddrs, struct pci_device *pci)
    {
    int i, c;
    unsigned short eeprom[0x21];
    unsigned int cfg;
    unsigned int mopt;
    unsigned short linktype;

    if (probeaddrs == 0 || probeaddrs[0] == 0)
          return 0;

    adjust_pci_device(pci);

    INF_3C90X.IOAddr = probeaddrs[0] & ~3;
    INF_3C90X.CurrentWindow = 255;
    switch (a3c90x_internal_ReadEeprom(INF_3C90X.IOAddr, 0x03))
	{
	case 0x9000: /** 10 Base TPO             **/
	case 0x9001: /** 10/100 T4               **/
	case 0x9050: /** 10/100 TPO              **/
	case 0x9051: /** 10 Base Combo           **/
		INF_3C90X.isBrev = 0;
		break;

	case 0x9004: /** 10 Base TPO             **/
	case 0x9005: /** 10 Base Combo           **/
	case 0x9006: /** 10 Base TPO and Base2   **/
	case 0x900A: /** 10 Base FL              **/
	case 0x9055: /** 10/100 TPO              **/
	case 0x9056: /** 10/100 T4               **/
	case 0x905A: /** 10 Base FX              **/
	default:
		INF_3C90X.isBrev = 1;
		break;
	}

    /** Load the EEPROM contents **/
    if (INF_3C90X.isBrev)
	{
	for(i=0;i<=0x20;i++)
	    {
	    eeprom[i] = a3c90x_internal_ReadEeprom(INF_3C90X.IOAddr, i);
	    }

#ifdef	CFG_3C90X_BOOTROM_FIX
	/** Set xcvrSelect in InternalConfig in eeprom. **/
	/* only necessary for 3c905b revision cards with boot PROM bug!!! */
	a3c90x_internal_WriteEeprom(INF_3C90X.IOAddr, 0x13, 0x0160);
#endif

#ifdef	CFG_3C90X_XCVR
	if (CFG_3C90X_XCVR == 255)
	    {
	    /** Clear the LanWorks register **/
	    a3c90x_internal_WriteEeprom(INF_3C90X.IOAddr, 0x16, 0);
	    }
	else
	    {
	    /** Set the selected permanent-xcvrSelect in the
	     ** LanWorks register
	     **/
	    a3c90x_internal_WriteEeprom(INF_3C90X.IOAddr, 0x16,
	                    XCVR_MAGIC + ((CFG_3C90X_XCVR) & 0x000F));
	    }
#endif
	}
    else
	{
	for(i=0;i<=0x17;i++)
	    {
	    eeprom[i] = a3c90x_internal_ReadEeprom(INF_3C90X.IOAddr, i);
	    }
	}

    /** Print identification message **/
    printf("\n\n3C90X Driver 2.00 "
           "Copyright 1999 LightSys Technology Services, Inc.\n"
           "Portions Copyright 1999 Steve Smith\n");
    printf("Provided with ABSOLUTELY NO WARRANTY.\n");
    printf("-------------------------------------------------------"
           "------------------------\n");

    /** Retrieve the Hardware address and print it on the screen. **/
    INF_3C90X.HWAddr[0] = eeprom[0]>>8;
    INF_3C90X.HWAddr[1] = eeprom[0]&0xFF;
    INF_3C90X.HWAddr[2] = eeprom[1]>>8;
    INF_3C90X.HWAddr[3] = eeprom[1]&0xFF;
    INF_3C90X.HWAddr[4] = eeprom[2]>>8;
    INF_3C90X.HWAddr[5] = eeprom[2]&0xFF;
    printf("MAC Address = %!\n", INF_3C90X.HWAddr);

    /** Program the MAC address into the station address registers **/
    a3c90x_internal_SetWindow(INF_3C90X.IOAddr, winAddressing2);
    outw(htons(eeprom[0]), INF_3C90X.IOAddr + regStationAddress_2_3w);
    outw(htons(eeprom[1]), INF_3C90X.IOAddr + regStationAddress_2_3w+2);
    outw(htons(eeprom[2]), INF_3C90X.IOAddr + regStationAddress_2_3w+4);
    outw(0, INF_3C90X.IOAddr + regStationMask_2_3w+0);
    outw(0, INF_3C90X.IOAddr + regStationMask_2_3w+2);
    outw(0, INF_3C90X.IOAddr + regStationMask_2_3w+4);

    /** Fill in our entry in the etherboot arp table **/
    for(i=0;i<ETH_ALEN;i++)
	nic->node_addr[i] = (eeprom[i/2] >> (8*((i&1)^1))) & 0xff;

    /** Read the media options register, print a message and set default
     ** xcvr.
     **
     ** Uses Media Option command on B revision, Reset Option on non-B
     ** revision cards -- same register address
     **/
    a3c90x_internal_SetWindow(INF_3C90X.IOAddr, winTxRxOptions3);
    mopt = inw(INF_3C90X.IOAddr + regResetMediaOptions_3_w);

    /** mask out VCO bit that is defined as 10baseFL bit on B-rev cards **/
    if (! INF_3C90X.isBrev)
	{
	mopt &= 0x7F;
	}

    printf("Connectors present: ");
    c = 0;
    linktype = 0x0008;
    if (mopt & 0x01)
	{
	printf("%s100Base-T4",(c++)?", ":"");
	linktype = 0x0006;
	}
    if (mopt & 0x04)
	{
	printf("%s100Base-FX",(c++)?", ":"");
	linktype = 0x0005;
	}
    if (mopt & 0x10)
	{
	printf("%s10Base-2",(c++)?", ":"");
	linktype = 0x0003;
	}
    if (mopt & 0x20)
	{
	printf("%sAUI",(c++)?", ":"");
	linktype = 0x0001;
	}
    if (mopt & 0x40)
	{
	printf("%sMII",(c++)?", ":"");
	linktype = 0x0006;
	}
    if ((mopt & 0xA) == 0xA)
	{
	printf("%s10Base-T / 100Base-TX",(c++)?", ":"");
	linktype = 0x0008;
	}
    else if ((mopt & 0xA) == 0x2)
	{
	printf("%s100Base-TX",(c++)?", ":"");
	linktype = 0x0008;
	}
    else if ((mopt & 0xA) == 0x8)
	{
	printf("%s10Base-T",(c++)?", ":"");
	linktype = 0x0008;
	}
    printf(".\n");

    /** Determine transceiver type to use, depending on value stored in
     ** eeprom 0x16
     **/
    if (INF_3C90X.isBrev)
	{
	if ((eeprom[0x16] & 0xFF00) == XCVR_MAGIC)
	    {
	    /** User-defined **/
	    linktype = eeprom[0x16] & 0x000F;
	    }
	}
    else
	{
#ifdef	CFG_3C90X_XCVR
	    if (CFG_3C90X_XCVR != 255)
		linktype = CFG_3C90X_XCVR;
#endif	/* CFG_3C90X_XCVR */

	    /** I don't know what MII MAC only mode is!!! **/
	    if (linktype == 0x0009)
		{
		if (INF_3C90X.isBrev)
			printf("WARNING: MII External MAC Mode only supported on B-revision "
			       "cards!!!!\nFalling Back to MII Mode\n");
		linktype = 0x0006;
		}
	}

    /** enable DC converter for 10-Base-T **/
    if (linktype == 0x0003)
	{
	a3c90x_internal_IssueCommand(INF_3C90X.IOAddr, cmdEnableDcConverter, 0);
	}

    /** Set the link to the type we just determined. **/
    a3c90x_internal_SetWindow(INF_3C90X.IOAddr, winTxRxOptions3);
    cfg = inl(INF_3C90X.IOAddr + regInternalConfig_3_l);
    cfg &= ~(0xF<<20);
    cfg |= (linktype<<20);
    outl(cfg, INF_3C90X.IOAddr + regInternalConfig_3_l);

    /** Now that we set the xcvr type, reset the Tx and Rx, re-enable. **/
    a3c90x_internal_IssueCommand(INF_3C90X.IOAddr, cmdTxReset, 0x00);
    while (inw(INF_3C90X.IOAddr + regCommandIntStatus_w) & INT_CMDINPROGRESS)
	;

    if (!INF_3C90X.isBrev)
	outb(0x01, INF_3C90X.IOAddr + regTxFreeThresh_b);

    a3c90x_internal_IssueCommand(INF_3C90X.IOAddr, cmdTxEnable, 0);

    /**
     ** reset of the receiver on B-revision cards re-negotiates the link
     ** takes several seconds (a computer eternity)
     **/
    if (INF_3C90X.isBrev)
	a3c90x_internal_IssueCommand(INF_3C90X.IOAddr, cmdRxReset, 0x04);
    else
	a3c90x_internal_IssueCommand(INF_3C90X.IOAddr, cmdRxReset, 0x00);
    while (inw(INF_3C90X.IOAddr + regCommandIntStatus_w) & INT_CMDINPROGRESS)
	;

    /** Set the RX filter = receive only individual pkts & bcast. **/
    a3c90x_internal_IssueCommand(INF_3C90X.IOAddr, cmdSetRxFilter, 0x01 + 0x04);
    a3c90x_internal_IssueCommand(INF_3C90X.IOAddr, cmdRxEnable, 0);


    /**
     ** set Indication and Interrupt flags , acknowledge any IRQ's
     **/
    a3c90x_internal_IssueCommand(INF_3C90X.IOAddr, cmdSetInterruptEnable, 0);
    a3c90x_internal_IssueCommand(INF_3C90X.IOAddr,
                                 cmdSetIndicationEnable, 0x0014);
    a3c90x_internal_IssueCommand(INF_3C90X.IOAddr,
                                 cmdAcknowledgeInterrupt, 0x661);

    /** Set our exported functions **/
    nic->reset    = a3c90x_reset;
    nic->poll     = a3c90x_poll;
    nic->transmit = a3c90x_transmit;
    nic->disable  = a3c90x_disable;

    return nic;
    }