X-Git-Url: http://git.joshuawise.com/netwatch.git/blobdiff_plain/f8903fddbc2a42d68bfe42a0fb6cf93ed3a14277..740eaa87b6bc35dbf35e43854635b2cf02ca3398:/net/3c90x.c

diff --git a/net/3c90x.c b/net/3c90x.c
index 30283a2..d405352 100644
--- a/net/3c90x.c
+++ b/net/3c90x.c
@@ -1,10 +1,12 @@
 /*
- * 3c90x.c -- This file implements the 3c90x driver for etherboot.  Written
- * by Greg Beeley, Greg.Beeley@LightSys.org.  Modified by Steve Smith,
- * Steve.Smith@Juno.Com. Alignment bug fix Neil Newell (nn@icenoir.net).
+ * 3c90x.c
+ * NetWatch
  *
- * This program Copyright (C) 1999 LightSys Technology Services, Inc.
- * Portions Copyright (C) 1999 Steve Smith
+ * A ring buffer-based, bus-mastering Ethernet driver.
+ *
+ * Derived from Etherboot's 3c90x.c, which is
+ *   Copyright (C) 1999 LightSys Technology Services, Inc.
+ *   Portions Copyright (C) 1999 Steve Smith
  *
  * This program may be re-distributed in source or binary form, modified,
  * sold, or copied for any purpose, provided that the above copyright message
@@ -15,13 +17,6 @@
  * PURPOSE or MERCHANTABILITY.  Please read the associated documentation
  * "3c90x.txt" before compiling and using this driver.
  *
- * --------
- *
- * Program written with the assistance of the 3com documentation for
- * the 3c905B-TX card, as well as with some assistance from the 3c59x
- * driver Donald Becker wrote for the Linux kernel, and with some assistance
- * from the remainder of the Etherboot distribution.
- *
  * REVISION HISTORY:
  *
  * v0.10	1-26-1998	GRB	Initial implementation.
@@ -31,9 +26,10 @@
  *					Re-wrote poll and transmit for
  *					better error recovery and heavy
  *					network traffic operation
- * v2.01    5-26-2003 NN Fixed driver alignment issue which
- *                  caused system lockups if driver structures
- *                  not 8-byte aligned.
+ * v2.01        5-26-2003       NN      Fixed driver alignment issue which
+ *                                      caused system lockups if driver structures
+ *                                      not 8-byte aligned.
+ * NetWatch0    12-07-2008      JAW     Taken out back and shot.
  *
  */
 
@@ -48,11 +44,6 @@
 #include <paging.h>
 
 #define	XCVR_MAGIC	(0x5A00)
-/** any single transmission fails after 16 collisions or other errors
- ** this is the number of times to retry the transmission -- this should
- ** be plenty
- **/
-#define	XMIT_RETRIES	5
 
 /*** Register definitions for the 3c905 ***/
 enum Registers
@@ -218,52 +209,49 @@ enum Commands
 #define INT_CMDINPROGRESS	(1<<12)
 #define INT_WINDOWNUMBER	(7<<13)
 
+/* These structures are all 64-bit aligned, as needed for bus-mastering I/O. */
+typedef struct {
+	unsigned int addr;
+	unsigned int len;
+} segment_t __attribute__ ((aligned(8)));
 
-/*** TX descriptor ***/
-typedef struct
-    {
-    unsigned int	DnNextPtr;
-    unsigned int	FrameStartHeader;
-    struct {
-      unsigned int addr;
-      unsigned int len;
-    } __attribute ((aligned(8))) segments[64];
-    }
-    TXD __attribute__ ((aligned(8))); /* 64-bit aligned for bus mastering */
+typedef struct {
+	unsigned int next;
+	unsigned int hdr;
+	segment_t segments[64 /* XXX magic */];
+} txdesc_t __attribute__ ((aligned(8)));
 
 /*** RX descriptor ***/
-typedef struct
-    {
-    unsigned int	UpNextPtr;
-    unsigned int	UpPktStatus;
-    unsigned int	DataAddr;
-    unsigned int	DataLength;
-    }
-    RXD __attribute__ ((aligned(8))); /* 64-bit aligned for bus mastering */
-
-/*** Global variables ***/
-static struct
-    {
-    unsigned int	is3c556;
-    unsigned char	isBrev;
-    unsigned char	CurrentWindow;
-    unsigned int	IOAddr;
-    unsigned char	HWAddr[ETH_ALEN];
-    TXD			TransmitDPD;
-    RXD			ReceiveUPD;
-    }
-    INF_3C90X;
-static struct nic nic;
-
-#define _outl(v,a) outl((a),(v))
-#define _outw(v,a) outw((a),(v))
-#define _outb(v,a) outb((a),(v))
-
-static int _issue_command(int ioaddr, int cmd, int param)
+typedef struct {
+	unsigned int	next;
+	unsigned int	status;
+	segment_t segments[64];
+} rxdesc_t __attribute__ ((aligned(8)));
+
+typedef struct {
+	struct nic nic;
+	int is3c556;
+	int isBrev;
+	int curwnd;
+	int ioaddr;
+} nic_3c90x_t;
+
+static nic_3c90x_t _nic;
+
+#define _inb(n,a) (inb((n)->ioaddr + (a)))
+#define _inw(n,a) (inw((n)->ioaddr + (a)))
+#define _inl(n,a) (inl((n)->ioaddr + (a)))
+
+#define _outb(n,a,d) (outb((n)->ioaddr + (a), (d)))
+#define _outw(n,a,d) (outw((n)->ioaddr + (a), (d)))
+#define _outl(n,a,d) (outl((n)->ioaddr + (a), (d)))
+
+
+static int _issue_command(nic_3c90x_t *nic, int cmd, int param)
 {
-	outw(ioaddr + regCommandIntStatus_w, (cmd << 11) | param);
+	_outw(nic, regCommandIntStatus_w, (cmd << 11) | param);
 
-	while (inw(ioaddr + regCommandIntStatus_w) & INT_CMDINPROGRESS)
+	while (_inw(nic, regCommandIntStatus_w) & INT_CMDINPROGRESS)
 		;
 
 	return 0;
@@ -272,27 +260,27 @@ static int _issue_command(int ioaddr, int cmd, int param)
 
 /*** a3c90x_internal_SetWindow: selects a register window set.
  ***/
-static int _set_window(int ioaddr, int window)
+static int _set_window(nic_3c90x_t *nic, int window)
 {
-	if (INF_3C90X.CurrentWindow == window)
+	if (nic->curwnd == window)
 		return 0;
 
-	_issue_command(ioaddr, cmdSelectRegisterWindow, window);
-	INF_3C90X.CurrentWindow = window;
+	_issue_command(nic, cmdSelectRegisterWindow, window);
+	nic->curwnd = window;
 
 	return 0;
 }
 
 
-/*** a3c90x_internal_ReadEeprom - read data from the serial eeprom.
+/*** _read_eeprom - read data from the serial eeprom.
  ***/
 static unsigned short
-a3c90x_internal_ReadEeprom(int ioaddr, int address)
+_read_eeprom(nic_3c90x_t *nic, int address)
 {
 	unsigned short val;
 
 	/** Select correct window **/
-        _set_window(INF_3C90X.IOAddr, winEepromBios0);
+        _set_window(nic, winEepromBios0);
 
 	/** Make sure the eeprom isn't busy **/
 	do
@@ -301,13 +289,13 @@ a3c90x_internal_ReadEeprom(int ioaddr, int address)
         	for (i = 0; i < 165; i++)
         		inb(0x80);	/* wait 165 usec */
         }
-	while(0x8000 & inw(ioaddr + regEepromCommand_0_w));
+	while(0x8000 & _inw(nic, regEepromCommand_0_w));
 
 	/** Read the value. **/
-	if (INF_3C90X.is3c556)
-		_outw(address + (0x230), ioaddr + regEepromCommand_0_w);
+	if (nic->is3c556)
+		_outw(nic, regEepromCommand_0_w, address + 0x230);
 	else
-		_outw(address + 0x80, ioaddr + regEepromCommand_0_w);
+		_outw(nic, regEepromCommand_0_w, address + 0x80);
 
 	do
 	{
@@ -315,220 +303,160 @@ a3c90x_internal_ReadEeprom(int ioaddr, int address)
 		for (i = 0; i < 165; i++)
 			inb(0x80);	/* wait 165 usec */
 	}
-	while(0x8000 & inw(ioaddr + regEepromCommand_0_w));
-	val = inw(ioaddr + regEepromData_0_w);
+	while(0x8000 & _inw(nic, regEepromCommand_0_w));
+	val = _inw(nic, regEepromData_0_w);
 	
 	return val;
 }
 
 
-#ifdef	CFG_3C90X_BOOTROM_FIX
-/*** a3c90x_internal_WriteEepromWord - write a physical word of
- *** data to the onboard serial eeprom (not the BIOS prom, but the
- *** nvram in the card that stores, among other things, the MAC
- *** address).
- ***/
-static int
-a3c90x_internal_WriteEepromWord(int ioaddr, int address, unsigned short value)
-    {
-	/** Select register window **/
-        _set_window(ioaddr, winEepromBios0);
-
-	/** Verify Eeprom not busy **/
-	while((1<<15) & inw(ioaddr + regEepromCommand_0_w));
-
-	/** Issue WriteEnable, and wait for completion. **/
-	_outw(0x30, ioaddr + regEepromCommand_0_w);
-	while((1<<15) & inw(ioaddr + regEepromCommand_0_w));
-
-	/** Issue EraseRegister, and wait for completion. **/
-	_outw(address + ((0x03)<<6), ioaddr + regEepromCommand_0_w);
-	while((1<<15) & inw(ioaddr + regEepromCommand_0_w));
-
-	/** Send the new data to the eeprom, and wait for completion. **/
-	_outw(value, ioaddr + regEepromData_0_w);
-	_outw(0x30, ioaddr + regEepromCommand_0_w);
-	while((1<<15) & inw(ioaddr + regEepromCommand_0_w));
-
-	/** Burn the new data into the eeprom, and wait for completion. **/
-	_outw(address + ((0x01)<<6), ioaddr + regEepromCommand_0_w);
-	while((1<<15) & inw(ioaddr + regEepromCommand_0_w));
-
-    return 0;
-    }
-#endif
-
-#ifdef	CFG_3C90X_BOOTROM_FIX
-/*** a3c90x_internal_WriteEeprom - write data to the serial eeprom,
- *** and re-compute the eeprom checksum.
- ***/
-static int
-a3c90x_internal_WriteEeprom(int ioaddr, int address, unsigned short value)
-    {
-    int cksum = 0,v;
-    int i;
-    int maxAddress, cksumAddress;
-
-	if (INF_3C90X.isBrev)
-	    {
-	    maxAddress=0x1f;
-	    cksumAddress=0x20;
-	    }
-	else
-	    {
-	    maxAddress=0x16;
-	    cksumAddress=0x17;
-	    }
-
-	/** Write the value. **/
-	if (a3c90x_internal_WriteEepromWord(ioaddr, address, value) == -1)
-	    return -1;
-
-	/** Recompute the checksum. **/
-	for(i=0;i<=maxAddress;i++)
-	    {
-	    v = a3c90x_internal_ReadEeprom(ioaddr, i);
-	    cksum ^= (v & 0xFF);
-	    cksum ^= ((v>>8) & 0xFF);
-	    }
-	/** Write the checksum to the location in the eeprom **/
-	if (a3c90x_internal_WriteEepromWord(ioaddr, cksumAddress, cksum) == -1)
-	    return -1;
-
-    return 0;
-    }
-#endif
-
+#if 0
 /*** a3c90x_reset: exported function that resets the card to its default
  *** state.  This is so the Linux driver can re-set the card up the way
  *** it wants to.  If CFG_3C90X_PRESERVE_XCVR is defined, then the reset will
  *** not alter the selected transceiver that we used to download the boot
  *** image.
  ***/
-static void a3c90x_reset(void)
-    {
-#ifdef	CFG_3C90X_PRESERVE_XCVR
-    int cfg;
-    /** Read the current InternalConfig value. **/
-    _set_window(INF_3C90X.IOAddr, winTxRxOptions3);
-    cfg = inl(INF_3C90X.IOAddr + regInternalConfig_3_l);
-#endif
-
+static void _reset(nic_3c90x_t *nic)
+{
     /** Send the reset command to the card **/
     outputf("3c90x: issuing RESET");
-    _issue_command(INF_3C90X.IOAddr, cmdGlobalReset, 0);
+    _issue_command(nic, cmdGlobalReset, 0);
 
     /** global reset command resets station mask, non-B revision cards
      ** require explicit reset of values
      **/
-    _set_window(INF_3C90X.IOAddr, winAddressing2);
-    _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);
-
-#ifdef	CFG_3C90X_PRESERVE_XCVR
-    /** Re-set the original InternalConfig value from before reset **/
-    _set_window(INF_3C90X.IOAddr, winTxRxOptions3);
-    _outl(cfg, INF_3C90X.IOAddr + regInternalConfig_3_l);
-
-    /** enable DC converter for 10-Base-T **/
-    if ((cfg&0x0300) == 0x0300)
-	{
-	_issue_command(INF_3C90X.IOAddr, cmdEnableDcConverter, 0);
-	}
-#endif
+    _set_window(nic, winAddressing2);
+    _outw(nic, regStationMask_2_3w+0, 0);
+    _outw(nic, regStationMask_2_3w+2, 0);
+    _outw(nic, regStationMask_2_3w+4, 0);
 
     /** Issue transmit reset, wait for command completion **/
-    _issue_command(INF_3C90X.IOAddr, cmdTxReset, 0);
-    if (! INF_3C90X.isBrev)
-	_outb(0x01, INF_3C90X.IOAddr + regTxFreeThresh_b);
-    _issue_command(INF_3C90X.IOAddr, cmdTxEnable, 0);
+    _issue_command(nic, cmdTxReset, 0);
+    if (!nic->isBrev)
+	_outb(nic, regTxFreeThresh_b, 0x01);
+    _issue_command(nic, cmdTxEnable, 0);
 
     /**
      ** reset of the receiver on B-revision cards re-negotiates the link
      ** takes several seconds (a computer eternity)
      **/
-    if (INF_3C90X.isBrev)
-	_issue_command(INF_3C90X.IOAddr, cmdRxReset, 0x04);
+    if (nic->isBrev)
+	_issue_command(nic, cmdRxReset, 0x04);
     else
-	_issue_command(INF_3C90X.IOAddr, cmdRxReset, 0x00);
-    while (inw(INF_3C90X.IOAddr + regCommandIntStatus_w) & INT_CMDINPROGRESS)
-       ;
-    _issue_command(INF_3C90X.IOAddr, cmdRxEnable, 0);
+	_issue_command(nic, cmdRxReset, 0x00);
+    _issue_command(nic, cmdRxEnable, 0);
 
-    _issue_command(INF_3C90X.IOAddr, cmdSetInterruptEnable, 0);
+    _issue_command(nic, cmdSetInterruptEnable, 0);
     /** enable rxComplete and txComplete **/
-    _issue_command(INF_3C90X.IOAddr, cmdSetIndicationEnable, 0x0014);
+    _issue_command(nic, cmdSetIndicationEnable, 0x0014);
     /** acknowledge any pending status flags **/
-    _issue_command(INF_3C90X.IOAddr, cmdAcknowledgeInterrupt, 0x661);
+    _issue_command(nic, cmdAcknowledgeInterrupt, 0x661);
 
     return;
-    }
+}
+#endif
 
+/***************************** Transmit routines *****************************/
 
+#define XMIT_BUFS 8
 
-/*** a3c90x_transmit: exported function that transmits a packet.  Does not
- *** return any particular status.  Parameters are:
- *** dest_addr[6] - destination address, ethernet;
- *** proto - protocol type (ARP, IP, etc);
- *** size - size of the non-header part of the packet that needs transmitted;
- *** pkt - the pointer to the packet data itself.
- ***/
-static void
-a3c90x_transmit(struct pbuf *p)
+static txdesc_t txdescs[XMIT_BUFS];
+static struct pbuf *txpbufs[XMIT_BUFS] = {0,};
+
+/* txcons is the index into the ring buffer of the last packet that the
+ * 3c90x was seen processing, or -1 if the 3c90x was idle.
+ */
+static int txcons = -1;
+
+/* txprod is the index of the _next_ buffer that the driver will write into. */
+static int txprod = 0;
+
+/* _transmit adds a packet to the transmit ring buffer.  If no space is
+ * available in the buffer, then _transmit blocks until a packet has been
+ * transmitted.
+ */
+static void _transmit(struct nic *_nic, struct pbuf *p)
 {
+	nic_3c90x_t *nic = (nic_3c90x_t *)_nic;
 	unsigned char status;
-	static unsigned int stillwaiting = 0;
-	unsigned int n, len;
+	int len, n;
 	
-	if (stillwaiting)
+	/* Wait for there to be space. */
+	if (txcons == txprod)
 	{
-		while (!(inw(INF_3C90X.IOAddr + regCommandIntStatus_w) & INT_TXCOMPLETE) && oneshot_running())
-			;
-		if (!(inw(INF_3C90X.IOAddr + regCommandIntStatus_w) & INT_TXCOMPLETE))
+		int i = 0;
+		
+		outputf("3c90x: txbuf full, waiting for space...");
+		while (_inl(nic, regDnListPtr_l) != 0)
+			i++;
+		outputf("3c90x: took %d iters", i);
+	}
+	
+	/* Stall the download engine so it doesn't bother us. */
+	_issue_command(nic, cmdStallCtl, 2 /* Stall download */);
+	
+	/* Clean up old txcons. */
+	if (txcons != -1)
+	{
+		unsigned long curp = _inl(nic, regDnListPtr_l);
+		int end;
+		
+		if (curp == 0)
+			end = txprod;
+		else
+			end = (curp - v2p(txdescs)) / sizeof(txdescs[0]);
+		
+		while (txcons != end)
 		{
-			outputf("3c90x: tx timeout? txstat %02x", inb(INF_3C90X.IOAddr + regTxStatus_b));
-			outputf("3c90x: Gen sts %04x", inw(INF_3C90X.IOAddr + regCommandIntStatus_w));
+			pbuf_free(txpbufs[txcons]);
+			txpbufs[txcons] = NULL;
+			txdescs[txcons].hdr = 0;
+			txdescs[txcons].next = 0;
+			txcons = (txcons + 1) % XMIT_BUFS;
 		}
-		status = inb(INF_3C90X.IOAddr + regTxStatus_b);
-		outb(INF_3C90X.IOAddr + regTxStatus_b, 0x00);
-		stillwaiting = 0;
+		if (txcons == txprod)
+			txcons = -1;
+	}
+	
+	/* Look at the TX status */
+	status = _inb(nic, regTxStatus_b);
+	if (status)
+	{
+		outputf("3c90x: error: the nus.");
+		_outb(nic, regTxStatus_b, 0x00);
 	}
 
-	_issue_command(INF_3C90X.IOAddr, cmdStallCtl, 2 /* Stall download */);
-
-	/** Setup the DPD (download descriptor) **/
-	INF_3C90X.TransmitDPD.DnNextPtr = 0;
+	/* Set up the new txdesc. */
+	txdescs[txprod].next = 0;
 	len = 0;
 	n = 0;
+	txpbufs[txprod] = p;
+	pbuf_ref(p);
 	for (; p; p = p->next)
 	{
-		INF_3C90X.TransmitDPD.segments[n].addr = v2p(p->payload);
-		INF_3C90X.TransmitDPD.segments[n].len = p->len | (p->next ? 0 : (1 << 31));
+		txdescs[txprod].segments[n].addr = v2p(p->payload);
+		txdescs[txprod].segments[n].len = p->len | (p->next ? 0 : (1 << 31));
 		len += p->len;
 		n++;
 	}
-	/** set notification for transmission completion (bit 15) **/
-	INF_3C90X.TransmitDPD.FrameStartHeader = (len) | 0x8000;
+	txdescs[txprod].hdr = len;	/* If we wanted completion notification, bit 15 */
 	
-	outputf("3c90x: Sending %d byte %d seg packet", len, n);
-
-	/** Send the packet **/
-	outl(INF_3C90X.IOAddr + regDnListPtr_l, v2p(&(INF_3C90X.TransmitDPD)));
-	_issue_command(INF_3C90X.IOAddr, cmdStallCtl, 3 /* Unstall download */);
-		
-	oneshot_start_ms(10);
-	while((inl(INF_3C90X.IOAddr + regDnListPtr_l) != 0) && oneshot_running())
-		;
-	if (!oneshot_running())
+	/* Now link the new one in, after it's been set up. */
+	txdescs[(txprod + XMIT_BUFS - 1) % XMIT_BUFS].next = v2p(&(txdescs[txprod]));
+	
+	/* If the card is stopped, start it up again. */
+	if (_inl(nic, regDnListPtr_l) == 0)
 	{
-		outputf("3c90x: Download engine pointer timeout");
-		return;
+		_outl(nic, regDnListPtr_l, v2p(&(txdescs[txprod])));
+		txcons = txprod;
 	}
+	
+	txprod = (txprod + 1) % XMIT_BUFS;
+	
+	/* And let it proceed on its way. */
+	_issue_command(nic, cmdStallCtl, 3 /* Unstall download */);
 
-	oneshot_start_ms(10);
-	stillwaiting = 1;
-		
 #if 0		
 	/** successful completion (sans "interrupt Requested" bit) **/
 	if ((status & 0xbf) == 0x80)
@@ -539,159 +467,196 @@ a3c90x_transmit(struct pbuf *p)
 	if (status & 0x02)
 	{
 		outputf("3c90x: Tx Reclaim Error (%hhX)", status);
-		a3c90x_reset();
+		_reset(nic);
 	} else if (status & 0x04) {
 		outputf("3c90x: Tx Status Overflow (%hhX)", status);
 		for (i=0; i<32; i++)
-			_outb(0x00, INF_3C90X.IOAddr + regTxStatus_b);
+			_outb(nic, regTxStatus_b, 0x00);
 		/** must re-enable after max collisions before re-issuing tx **/
-		_issue_command(INF_3C90X.IOAddr, cmdTxEnable, 0);
+		_issue_command(nic, cmdTxEnable, 0);
 	} else if (status & 0x08) {
 		outputf("3c90x: Tx Max Collisions (%hhX)", status);
 		/** must re-enable after max collisions before re-issuing tx **/
-		_issue_command(INF_3C90X.IOAddr, cmdTxEnable, 0);
+		_issue_command(nic, cmdTxEnable, 0);
 	} else if (status & 0x10) {
 		outputf("3c90x: Tx Underrun (%hhX)", status);
-		a3c90x_reset();
+		_reset(nic);
 	} else if (status & 0x20) {
 		outputf("3c90x: Tx Jabber (%hhX)", status);
-		a3c90x_reset();
+		_reset(nic);
 	} else if ((status & 0x80) != 0x80) {
 		outputf("3c90x: Internal Error - Incomplete Transmission (%hhX)", status);
-		a3c90x_reset();
+		_reset(nic);
 	}
 #endif
 }
 
+/***************************** Receive routines *****************************/
+#define MAX_RECV_SIZE 1536
+#define RECV_BUFS 32
 
+static rxdesc_t rxdescs[RECV_BUFS];
+static struct pbuf *rxpbufs[RECV_BUFS] = {0,};
 
-/*** a3c90x_poll: exported routine that waits for a certain length of time
- *** for a packet, and if it sees none, returns 0.  This routine should
- *** copy the packet to nic->packet if it gets a packet and set the size
- *** in nic->packetlen.  Return 1 if a packet was found.
- ***/
-static int
-a3c90x_poll(struct nic *nic, int retrieve)
-    {
-    int i, errcode;
-
-    if (!(inw(INF_3C90X.IOAddr + regCommandIntStatus_w)&0x0010))
-	{
-	return 0;
-	}
-
-    if ( ! retrieve ) return 1;
-
-    /** we don't need to acknowledge rxComplete -- the upload engine
-     ** does it for us.
-     **/
-
-    /** Build the up-load descriptor **/
-    INF_3C90X.ReceiveUPD.UpNextPtr = 0;
-    INF_3C90X.ReceiveUPD.UpPktStatus = 0;
-    INF_3C90X.ReceiveUPD.DataAddr = v2p(nic->packet);
-    INF_3C90X.ReceiveUPD.DataLength = 1536 + (1<<31);
+/* rxcons is the pointer to the receive descriptor that the ethernet card will
+ * write into next.
+ */
+static int rxcons = 0;
 
-    /** Submit the upload descriptor to the NIC **/
-    _outl(v2p(&(INF_3C90X.ReceiveUPD)),
-         INF_3C90X.IOAddr + regUpListPtr_l);
+/* rxprod is the pointer to the receive descriptor that the driver will
+ * allocate next.
+ */
+static int rxprod = 0;
 
-    /** 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++);
+/* _recv_prepare fills the 3c90x's ring buffer with fresh pbufs from lwIP.
+ * The upload engine need not be stalled.
+ */
+static void _recv_prepare(nic_3c90x_t *nic)
+{
+	int oldprod;
 
-    /** Check for Error (else we have good packet) **/
-    if (INF_3C90X.ReceiveUPD.UpPktStatus & (1<<14))
+	oldprod = rxprod;
+	while ((rxprod != rxcons) || !rxpbufs[rxprod])
 	{
-	errcode = INF_3C90X.ReceiveUPD.UpPktStatus;
-	if (errcode & (1<<16))
-	    outputf("3C90X: Rx Overrun (%hX)",errcode>>16);
-	else if (errcode & (1<<17))
-	    outputf("3C90X: Runt Frame (%hX)",errcode>>16);
-	else if (errcode & (1<<18))
-	    outputf("3C90X: Alignment Error (%hX)",errcode>>16);
-	else if (errcode & (1<<19))
-	    outputf("3C90X: CRC Error (%hX)",errcode>>16);
-	else if (errcode & (1<<20))
-	    outputf("3C90X: Oversized Frame (%hX)",errcode>>16);
-	else
-	    outputf("3C90X: Packet error (%hX)",errcode>>16);
-	return 0;
+		int i;
+		struct pbuf *p;
+		
+		if (!rxpbufs[rxprod])
+			rxpbufs[rxprod] = p = pbuf_alloc(PBUF_RAW, MAX_RECV_SIZE, PBUF_POOL);
+		else {
+			outputf("WARNING: 3c90x has pbuf in slot %d", rxprod);
+			p = rxpbufs[rxprod];
+		}
+		
+		if (!p)
+		{
+			outputf("3c90x: out of memory for rx pbuf?");
+			break;
+		}
+		
+		rxdescs[rxprod].status = 0;
+		rxdescs[rxprod].next = 0;
+		for (i = 0; p; p = p->next, i++)
+		{
+			rxdescs[rxprod].segments[i].addr = v2p(p->payload);
+			rxdescs[rxprod].segments[i].len = p->len | (p->next ? 0 : (1 << 31));
+		}
+		
+		/* Hook in the new one after and only after it's been fully set up. */
+		rxdescs[(rxprod + RECV_BUFS - 1) % RECV_BUFS].next = v2p(&(rxdescs[rxprod]));
+		rxprod = (rxprod + 1) % RECV_BUFS;
 	}
+	
+	if (_inl(nic, regUpListPtr_l) == 0 && rxpbufs[oldprod])	/* Ran out of shit, and got new shit? */
+	{
+		_outl(nic, regUpListPtr_l, v2p(&rxdescs[oldprod]));
+		outputf("3c90x: WARNING: Ran out of rx slots");
+	}
+	
+	_issue_command(nic, cmdStallCtl, 1 /* Unstall upload */);
+}
 
-    /** 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]
- ***/
-void a3c90x_disable(struct dev *dev)
+/* _recv polls the ring buffer to see if any packets are available.  If any 
+ * are, then eth_recv is called for each available.  _recv returns how many
+ * packets it received successfully.  Whether _recv got any packets or not,
+ * _recv does not block, and reinitializes the ring buffer with fresh pbufs.
+ */
+static int _recv(struct nic *_nic)
 {
-	/* reset and disable merge */
-	a3c90x_reset();
-	/* Disable the receiver and transmitter. */
-	_outw(cmdRxDisable, INF_3C90X.IOAddr + regCommandIntStatus_w);
-	_outw(cmdTxDisable, INF_3C90X.IOAddr + regCommandIntStatus_w);
-}
+	nic_3c90x_t *nic = (nic_3c90x_t *)_nic;
+	int errcode, n = 0;
+	struct pbuf *p;
+	
+	/* Nothing to do? */
+	while ((rxdescs[rxcons].status & ((1<<14) | (1<<15))) != 0)
+	{
+		/** Check for Error (else we have good packet) **/
+		if (rxdescs[rxcons].status & (1<<14))
+		{
+			errcode = rxdescs[rxcons].status;
+			if (errcode & (1<<16))
+				outputf("3C90X: Rx Overrun (%hX)",errcode>>16);
+			else if (errcode & (1<<17))
+				outputf("3C90X: Runt Frame (%hX)",errcode>>16);
+			else if (errcode & (1<<18))
+				outputf("3C90X: Alignment Error (%hX)",errcode>>16);
+			else if (errcode & (1<<19))
+				outputf("3C90X: CRC Error (%hX)",errcode>>16);
+			else if (errcode & (1<<20))
+				outputf("3C90X: Oversized Frame (%hX)",errcode>>16);
+			else
+				outputf("3C90X: Packet error (%hX)",errcode>>16);
+		
+			p = NULL;	
+			pbuf_free(rxpbufs[rxcons]);		/* Bounce the old one before setting it up again. */
+		} else {
+			p = rxpbufs[rxcons];
+			pbuf_realloc(p, rxdescs[rxcons].status & 0x1FFF);	/* Resize the packet to how large it actually is. */
+		}
+		
+		rxpbufs[rxcons] = NULL;
+		rxdescs[rxcons].status = 0; 
+		rxcons = (rxcons + 1) % RECV_BUFS;
+		
+		if (p)
+		{
+			eth_recv(_nic, p);
+			n++;
+		}
+	}
 
+	_recv_prepare(nic);	/* Light the NIC up again. */
+	return n;
+}
 
 /*** 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.
  ***/
-static int a3c90x_probe(struct pci_dev * pci, void * data)
+static int _probe(struct pci_dev *pci, void *data)
 {
-    INF_3C90X.is3c556 = (pci->did == 0x6055);
- 
-    int i, c;
-    unsigned short eeprom[0x100];
-    unsigned int cfg;
-    unsigned int mopt;
-    unsigned int mstat;
-    unsigned short linktype;
+	nic_3c90x_t *nic = &_nic;
+	int i, c;
+	unsigned short eeprom[0x100];
+	unsigned int cfg;
+	unsigned int mopt;
+	unsigned int mstat;
+	unsigned short linktype;
 #define	HWADDR_OFFSET	10
 
-    unsigned long ioaddr = 0;
-    for (i = 0; i < 6; i++) {
-        if (pci->bars[i].type == PCI_BAR_IO) {
-            ioaddr = pci->bars[i].addr;
-            break;
-        }
-    }
-
-    if (ioaddr == 0)
-    {
-        outputf("3c90x: Unable to find I/O address");
-        return 0;
-    }
-    
-    /* Power it on */
-    pci_write16(pci->bus, pci->dev, pci->fn, 0xE0,
-    	pci_read16(pci->bus, pci->dev, pci->fn, 0xE0) & ~0x3);
+	unsigned long ioaddr = 0;
+	for (i = 0; i < 6; i++)
+		if (pci->bars[i].type == PCI_BAR_IO)
+		{
+			ioaddr = pci->bars[i].addr;
+			break;
+		}
+		
+	if (ioaddr == 0)
+	{
+		outputf("3c90x: Unable to find I/O address");
+		return 0;
+	}
     
-    outputf("3c90x: Picked I/O address %04x", ioaddr);
-    pci_bother_add(pci);
-    nic.ioaddr = ioaddr & ~3;
-    nic.irqno = 0;
-
-    INF_3C90X.IOAddr = ioaddr;
-    INF_3C90X.CurrentWindow = 255;
-    switch (a3c90x_internal_ReadEeprom(INF_3C90X.IOAddr, 0x03))
+	/* Power it on */
+	pci_write16(pci->bus, pci->dev, pci->fn, 0xE0,
+		pci_read16(pci->bus, pci->dev, pci->fn, 0xE0) & ~0x3);
+	
+	outputf("3c90x: Picked I/O address %04x", ioaddr);
+	pci_bother_add(pci);
+	nic->nic.ioaddr = ioaddr & ~3;
+	nic->nic.irqno = 0;
+
+	nic->ioaddr = ioaddr;
+	nic->is3c556 = (pci->did == 0x6055);
+	nic->curwnd = 255;
+	switch (_read_eeprom(nic, 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;
+		nic->isBrev = 0;
 		break;
 
 	case 0x9004: /** 10 Base TPO             **/
@@ -702,273 +667,186 @@ static int a3c90x_probe(struct pci_dev * pci, void * data)
 	case 0x9056: /** 10/100 T4               **/
 	case 0x905A: /** 10 Base FX              **/
 	default:
-		INF_3C90X.isBrev = 1;
+		nic->isBrev = 1;
 		break;
 	}
 
-    /** Load the EEPROM contents **/
-    if (INF_3C90X.isBrev)
-	{
-	for(i=0;i<=/*0x20*/0x7F;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);
-	    }
+	/** Load the EEPROM contents **/
+	if (nic->isBrev)
+		for(i=0;i<=0x20;i++)
+			eeprom[i] = _read_eeprom(nic, i);
 	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*/0x7F;i++)
-	    {
-	    eeprom[i] = a3c90x_internal_ReadEeprom(INF_3C90X.IOAddr, i);
-	    }
-	}
-
-    /** Print identification message **/
-#ifdef	CFG_3C90X_BOOTROM_FIX
-    if (INF_3C90X.isBrev)
-        {
-        outputf("NOTE: 3c905b bootrom fix enabled; has side "
-	   "effects.  See 3c90x.txt for info.");
+		for(i=0;i<=0x17;i++)
+			eeprom[i] = _read_eeprom(nic, i);
+
+	/** Retrieve the Hardware address and print it on the screen. **/
+	nic->nic.hwaddr[0] = eeprom[HWADDR_OFFSET + 0]>>8;
+	nic->nic.hwaddr[1] = eeprom[HWADDR_OFFSET + 0]&0xFF;
+	nic->nic.hwaddr[2] = eeprom[HWADDR_OFFSET + 1]>>8;
+	nic->nic.hwaddr[3] = eeprom[HWADDR_OFFSET + 1]&0xFF;
+	nic->nic.hwaddr[4] = eeprom[HWADDR_OFFSET + 2]>>8;
+	nic->nic.hwaddr[5] = eeprom[HWADDR_OFFSET + 2]&0xFF;
+	outputf("MAC Address = %02x:%02x:%02x:%02x:%02x:%02x",
+		nic->nic.hwaddr[0], nic->nic.hwaddr[1],
+		nic->nic.hwaddr[2], nic->nic.hwaddr[3],
+		nic->nic.hwaddr[4], nic->nic.hwaddr[5]);
+
+	/** 3C556: Invert MII power **/
+	if (nic->is3c556) {
+		_set_window(nic, winAddressing2);
+		_outw(nic, regResetOptions_2_w,
+			_inw(nic, regResetOptions_2_w) | 0x4000);
 	}
-#endif
-
-    /** Retrieve the Hardware address and print it on the screen. **/
-    INF_3C90X.HWAddr[0] = eeprom[HWADDR_OFFSET + 0]>>8;
-    INF_3C90X.HWAddr[1] = eeprom[HWADDR_OFFSET + 0]&0xFF;
-    INF_3C90X.HWAddr[2] = eeprom[HWADDR_OFFSET + 1]>>8;
-    INF_3C90X.HWAddr[3] = eeprom[HWADDR_OFFSET + 1]&0xFF;
-    INF_3C90X.HWAddr[4] = eeprom[HWADDR_OFFSET + 2]>>8;
-    INF_3C90X.HWAddr[5] = eeprom[HWADDR_OFFSET + 2]&0xFF;
-    outputf("MAC Address = %02x:%02x:%02x:%02x:%02x:%02x",
-    	INF_3C90X.HWAddr[0],
-    	INF_3C90X.HWAddr[1],
-    	INF_3C90X.HWAddr[2],
-    	INF_3C90X.HWAddr[3],
-    	INF_3C90X.HWAddr[4],
-    	INF_3C90X.HWAddr[5]);
-
-    /** 3C556: Invert MII power **/
-    if (INF_3C90X.is3c556) {
-	unsigned int tmp;
-	_set_window(INF_3C90X.IOAddr, winAddressing2);
-	tmp = inw(INF_3C90X.IOAddr + regResetOptions_2_w);
-	tmp |= 0x4000;
-	_outw(tmp, INF_3C90X.IOAddr + regResetOptions_2_w);
-    }
-
-    /* Test if the link is good, if not continue */
-    _set_window(INF_3C90X.IOAddr, winDiagnostics4);
-    mstat = inw(INF_3C90X.IOAddr + regMediaStatus_4_w);
-    if((mstat & (1<<11)) == 0) {
-	outputf("Valid link not established");
-	return 0;
-    }
-
-    /** Program the MAC address into the station address registers **/
-    _set_window(INF_3C90X.IOAddr, winAddressing2);
-    _outw(htons(eeprom[HWADDR_OFFSET + 0]), INF_3C90X.IOAddr + regStationAddress_2_3w);
-    _outw(htons(eeprom[HWADDR_OFFSET + 1]), INF_3C90X.IOAddr + regStationAddress_2_3w+2);
-    _outw(htons(eeprom[HWADDR_OFFSET + 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 **/
-/* XXX ? for lwip? 
-    for(i=0;i<ETH_ALEN;i++)
-	nic.node_addr[i] = (eeprom[HWADDR_OFFSET + 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
-     **/
-    _set_window(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;
+	/* Test if the link is good; if not, bail out */
+	_set_window(nic, winDiagnostics4);
+	mstat = _inw(nic, regMediaStatus_4_w);
+	if((mstat & (1<<11)) == 0) {
+		outputf("3c90x: valid link not established");
+		return 0;
 	}
 
-    outputf("Connectors present: ");
-    c = 0;
-    linktype = 0x0008;
-    if (mopt & 0x01)
-	{
-	outputf("%s100Base-T4",(c++)?", ":"");
-	linktype = 0x0006;
-	}
-    if (mopt & 0x04)
-	{
-	outputf("%s100Base-FX",(c++)?", ":"");
-	linktype = 0x0005;
-	}
-    if (mopt & 0x10)
+	/* Program the MAC address into the station address registers */
+	_set_window(nic, winAddressing2);
+	_outw(nic, regStationAddress_2_3w, htons(eeprom[HWADDR_OFFSET + 0]));
+	_outw(nic, regStationAddress_2_3w+2, htons(eeprom[HWADDR_OFFSET + 1]));
+	_outw(nic, regStationAddress_2_3w+4, htons(eeprom[HWADDR_OFFSET + 2]));
+	_outw(nic, regStationMask_2_3w+0, 0);
+	_outw(nic, regStationMask_2_3w+2, 0);
+	_outw(nic, regStationMask_2_3w+4, 0);
+
+	/** 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
+	 **/
+	_set_window(nic, winTxRxOptions3);
+	mopt = _inw(nic, regResetMediaOptions_3_w);
+
+	/** mask out VCO bit that is defined as 10baseFL bit on B-rev cards **/
+	if (!nic->isBrev)
+		mopt &= 0x7F;
+
+	outputf("3c90x: connectors present: ");
+	c = 0;
+	linktype = 0x0008;
+	if (mopt & 0x01)
 	{
-	outputf("%s10Base-2",(c++)?", ":"");
-	linktype = 0x0003;
+		outputf("  100Base-T4");
+		linktype = 0x0006;
 	}
-    if (mopt & 0x20)
+	if (mopt & 0x04)
 	{
-	outputf("%sAUI",(c++)?", ":"");
-	linktype = 0x0001;
+		outputf("  100Base-FX");
+		linktype = 0x0005;
 	}
-    if (mopt & 0x40)
+	if (mopt & 0x10)
 	{
-	outputf("%sMII",(c++)?", ":"");
-	linktype = 0x0006;
+		outputf("  10Base-2");
+		linktype = 0x0003;
 	}
-    if ((mopt & 0xA) == 0xA)
+	if (mopt & 0x20)
 	{
-	outputf("%s10Base-T / 100Base-TX",(c++)?", ":"");
-	linktype = 0x0008;
+		outputf("  AUI");
+		linktype = 0x0001;
 	}
-    else if ((mopt & 0xA) == 0x2)
+	if (mopt & 0x40)
 	{
-	outputf("%s100Base-TX",(c++)?", ":"");
-	linktype = 0x0008;
+		outputf("  MII");
+		linktype = 0x0006;
 	}
-    else if ((mopt & 0xA) == 0x8)
+	if ((mopt & 0xA) == 0xA)
 	{
-	outputf("%s10Base-T",(c++)?", ":"");
-	linktype = 0x0008;
+		outputf("  10Base-T / 100Base-TX");
+		linktype = 0x0008;
+	} else if ((mopt & 0xA) == 0x2) {
+		outputf("  100Base-TX");
+		linktype = 0x0008;
+	} else if ((mopt & 0xA) == 0x8) {
+		outputf("  10Base-T");
+		linktype = 0x0008;
 	}
-    outputf(".");
 
-    /** 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)
+	/** Determine transceiver type to use, depending on value stored in
+	 ** eeprom 0x16
+	 **/
+	if (nic->isBrev && ((eeprom[0x16] & 0xFF00) == XCVR_MAGIC))
+		linktype = eeprom[0x16] & 0x000F;	/* User-defined */
+	else if (linktype == 0x0009) {
+		if (nic->isBrev)
 			outputf("WARNING: MII External MAC Mode only supported on B-revision "
-			       "cards!!!!\nFalling Back to MII Mode\n");
+			        "cards!!!!\nFalling Back to MII Mode\n");
 		linktype = 0x0006;
-		}
-	}
-
-    /** enable DC converter for 10-Base-T **/
-    if (linktype == 0x0003)
-	{
-	_issue_command(INF_3C90X.IOAddr, cmdEnableDcConverter, 0);
 	}
 
-    /** Set the link to the type we just determined. **/
-    _set_window(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. **/
-    _issue_command(INF_3C90X.IOAddr, cmdTxReset, 0);
-    if (!INF_3C90X.isBrev)
-	_outb(0x01, INF_3C90X.IOAddr + regTxFreeThresh_b);
-
-    _issue_command(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)
-	_issue_command(INF_3C90X.IOAddr, cmdRxReset, 0x04);
-    else
-	_issue_command(INF_3C90X.IOAddr, cmdRxReset, 0x00);
-
-    /** Set the RX filter = receive only individual pkts & multicast & bcast. **/
-    _issue_command(INF_3C90X.IOAddr, cmdSetRxFilter, 0x01 + 0x02 + 0x04);
-    _issue_command(INF_3C90X.IOAddr, cmdRxEnable, 0);
-
-
-    /**
-     ** set Indication and Interrupt flags , acknowledge any IRQ's
-     **/
-    _issue_command(INF_3C90X.IOAddr, cmdSetInterruptEnable, 0);
-    _issue_command(INF_3C90X.IOAddr, cmdSetIndicationEnable, 0x0014);
-    _issue_command(INF_3C90X.IOAddr, cmdAcknowledgeInterrupt, 0x661);
-
-    /* * Set our exported functions **/
-    nic.poll     = a3c90x_poll;
-    nic.transmit = a3c90x_transmit;
-    memcpy(nic.hwaddr, INF_3C90X.HWAddr, 6);
-    eth_register(&nic);
-
-    return 1;
+	/** enable DC converter for 10-Base-T **/
+	if (linktype == 0x0003)
+		_issue_command(nic, cmdEnableDcConverter, 0);
+
+	/** Set the link to the type we just determined. **/
+	_set_window(nic, winTxRxOptions3);
+	cfg = _inl(nic, regInternalConfig_3_l);
+	cfg &= ~(0xF<<20);
+	cfg |= (linktype<<20);
+	_outl(nic, regInternalConfig_3_l, cfg);
+
+	/* Reset and turn on the transmit engine. */
+	_issue_command(nic, cmdTxReset, 0);
+	if (!nic->isBrev)
+		_outb(nic, regTxFreeThresh_b, 0x01);
+	_issue_command(nic, cmdTxEnable, 0);
+
+	/* Reset and turn on the receive engine. */
+	_issue_command(nic, cmdRxReset, nic->isBrev ? 0x04 : 0x00);
+	_issue_command(nic, cmdSetRxFilter, 0x01 + 0x02 + 0x04);	/* Individual, multicast, broadcast */
+	_recv_prepare(nic);					/* Set up the ring buffer... */
+	_issue_command(nic, cmdRxEnable, 0);	/* ... and light it up. */
+
+	/* Turn on interrupts, and ack any that are hanging out. */
+	_issue_command(nic, cmdSetInterruptEnable, 0);
+	_issue_command(nic, cmdSetIndicationEnable, 0x0014);
+	_issue_command(nic, cmdAcknowledgeInterrupt, 0x661);
+
+	/* Register with lwIP. */
+	nic->nic.recv = _recv;
+	nic->nic.transmit = _transmit;
+	eth_register(&(nic->nic));
+
+	return 1;
 }
 
-static struct pci_id a3c90x_nics[] = {
-/* Original 90x revisions: */
-PCI_ROM(0x10b7, 0x6055, "3c556",	 "3C556"),		/* Huricane */
-PCI_ROM(0x10b7, 0x9000, "3c905-tpo",     "3Com900-TPO"),	/* 10 Base TPO */
-PCI_ROM(0x10b7, 0x9001, "3c905-t4",      "3Com900-Combo"),	/* 10/100 T4 */
-PCI_ROM(0x10b7, 0x9050, "3c905-tpo100",  "3Com905-TX"),		/* 100 Base TX / 10/100 TPO */
-PCI_ROM(0x10b7, 0x9051, "3c905-combo",   "3Com905-T4"),		/* 100 Base T4 / 10 Base Combo */
-/* Newer 90xB revisions: */
-PCI_ROM(0x10b7, 0x9004, "3c905b-tpo",    "3Com900B-TPO"),	/* 10 Base TPO */
-PCI_ROM(0x10b7, 0x9005, "3c905b-combo",  "3Com900B-Combo"),	/* 10 Base Combo */
-PCI_ROM(0x10b7, 0x9006, "3c905b-tpb2",   "3Com900B-2/T"),	/* 10 Base TP and Base2 */
-PCI_ROM(0x10b7, 0x900a, "3c905b-fl",     "3Com900B-FL"),	/* 10 Base FL */
-PCI_ROM(0x10b7, 0x9055, "3c905b-tpo100", "3Com905B-TX"),	/* 10/100 TPO */
-PCI_ROM(0x10b7, 0x9056, "3c905b-t4",     "3Com905B-T4"),	/* 10/100 T4 */
-PCI_ROM(0x10b7, 0x9058, "3c905b-9058",   "3Com905B-9058"),	/* Cyclone 10/100/BNC */
-PCI_ROM(0x10b7, 0x905a, "3c905b-fx",     "3Com905B-FL"),	/* 100 Base FX / 10 Base FX */
-/* Newer 90xC revision: */
-PCI_ROM(0x10b7, 0x9200, "3c905c-tpo",    "3Com905C-TXM"),	/* 10/100 TPO (3C905C-TXM) */
-PCI_ROM(0x10b7, 0x9202, "3c920b-emb-ati", "3c920B-EMB-WNM (ATI Radeon 9100 IGP)"),	/* 3c920B-EMB-WNM (ATI Radeon 9100 IGP) */
-PCI_ROM(0x10b7, 0x9210, "3c920b-emb-wnm","3Com20B-EMB WNM"),
-PCI_ROM(0x10b7, 0x9800, "3c980",         "3Com980-Cyclone"),	/* Cyclone */
-PCI_ROM(0x10b7, 0x9805, "3c9805",        "3Com9805"),		/* Dual Port Server Cyclone */
-PCI_ROM(0x10b7, 0x7646, "3csoho100-tx",  "3CSOHO100-TX"),	/* Hurricane */
-PCI_ROM(0x10b7, 0x4500, "3c450",         "3Com450 HomePNA Tornado"),
-PCI_ROM(0x10b7, 0x1201, "3c982a",        "3Com982A"),
-PCI_ROM(0x10b7, 0x1202, "3c982b",        "3Com982B"),
+static struct pci_id _pci_ids[] = {
+	/* Original 90x revisions: */
+	PCI_ROM(0x10b7, 0x6055, "3c556",	 "3C556"),		/* Huricane */
+	PCI_ROM(0x10b7, 0x9000, "3c905-tpo",     "3Com900-TPO"),	/* 10 Base TPO */
+	PCI_ROM(0x10b7, 0x9001, "3c905-t4",      "3Com900-Combo"),	/* 10/100 T4 */
+	PCI_ROM(0x10b7, 0x9050, "3c905-tpo100",  "3Com905-TX"),		/* 100 Base TX / 10/100 TPO */
+	PCI_ROM(0x10b7, 0x9051, "3c905-combo",   "3Com905-T4"),		/* 100 Base T4 / 10 Base Combo */
+	/* Newer 90xB revisions: */
+	PCI_ROM(0x10b7, 0x9004, "3c905b-tpo",    "3Com900B-TPO"),	/* 10 Base TPO */
+	PCI_ROM(0x10b7, 0x9005, "3c905b-combo",  "3Com900B-Combo"),	/* 10 Base Combo */
+	PCI_ROM(0x10b7, 0x9006, "3c905b-tpb2",   "3Com900B-2/T"),	/* 10 Base TP and Base2 */
+	PCI_ROM(0x10b7, 0x900a, "3c905b-fl",     "3Com900B-FL"),	/* 10 Base FL */
+	PCI_ROM(0x10b7, 0x9055, "3c905b-tpo100", "3Com905B-TX"),	/* 10/100 TPO */
+	PCI_ROM(0x10b7, 0x9056, "3c905b-t4",     "3Com905B-T4"),	/* 10/100 T4 */
+	PCI_ROM(0x10b7, 0x9058, "3c905b-9058",   "3Com905B-9058"),	/* Cyclone 10/100/BNC */
+	PCI_ROM(0x10b7, 0x905a, "3c905b-fx",     "3Com905B-FL"),	/* 100 Base FX / 10 Base FX */
+	/* Newer 90xC revision: */
+	PCI_ROM(0x10b7, 0x9200, "3c905c-tpo",    "3Com905C-TXM"),	/* 10/100 TPO (3C905C-TXM) */
+	PCI_ROM(0x10b7, 0x9202, "3c920b-emb-ati", "3c920B-EMB-WNM (ATI Radeon 9100 IGP)"),	/* 3c920B-EMB-WNM (ATI Radeon 9100 IGP) */
+	PCI_ROM(0x10b7, 0x9210, "3c920b-emb-wnm","3Com20B-EMB WNM"),
+	PCI_ROM(0x10b7, 0x9800, "3c980",         "3Com980-Cyclone"),	/* Cyclone */
+	PCI_ROM(0x10b7, 0x9805, "3c9805",        "3Com9805"),		/* Dual Port Server Cyclone */
+	PCI_ROM(0x10b7, 0x7646, "3csoho100-tx",  "3CSOHO100-TX"),	/* Hurricane */
+	PCI_ROM(0x10b7, 0x4500, "3c450",         "3Com450 HomePNA Tornado"),
+	PCI_ROM(0x10b7, 0x1201, "3c982a",        "3Com982A"),
+	PCI_ROM(0x10b7, 0x1202, "3c982b",        "3Com982B"),
 };
 
 struct pci_driver a3c90x_driver = {
-	.name     = "3C90X",
-	.probe    = a3c90x_probe,
-	.ids      = a3c90x_nics,
-	.id_count = sizeof(a3c90x_nics)/sizeof(a3c90x_nics[0]),
+	.name     = "3c90x",
+	.probe    = _probe,
+	.ids      = _pci_ids,
+	.id_count = sizeof(_pci_ids)/sizeof(_pci_ids[0]),
 };