Initial import

1 files changed, 956 insertions, 0 deletions

diff --git a/drivers/net/ethernet/amd/sun3lance.c b/drivers/net/ethernet/amd/sun3lance.c
new file mode 100644
index 000000000..3d8c6b2cd
--- /dev/null
+++ b/drivers/net/ethernet/amd/sun3lance.c
@@ -0,0 +1,956 @@
+/* sun3lance.c: Ethernet driver for SUN3 Lance chip */
+/*
+
+  Sun3 Lance ethernet driver, by Sam Creasey (sammy@users.qual.net).
+  This driver is a part of the linux kernel, and is thus distributed
+  under the GNU General Public License.
+
+  The values used in LANCE_OBIO and LANCE_IRQ seem to be empirically
+  true for the correct IRQ and address of the lance registers.  They
+  have not been widely tested, however.  What we probably need is a
+  "proper" way to search for a device in the sun3's prom, but, alas,
+  linux has no such thing.
+
+  This driver is largely based on atarilance.c, by Roman Hodek.  Other
+  sources of inspiration were the NetBSD sun3 am7990 driver, and the
+  linux sparc lance driver (sunlance.c).
+
+  There are more assumptions made throughout this driver, it almost
+  certainly still needs work, but it does work at least for RARP/BOOTP and
+  mounting the root NFS filesystem.
+
+*/
+
+static char *version = "sun3lance.c: v1.2 1/12/2001  Sam Creasey (sammy@sammy.net)\n";
+
+#include <linux/module.h>
+#include <linux/stddef.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/bitops.h>
+
+#include <asm/cacheflush.h>
+#include <asm/setup.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/dvma.h>
+#include <asm/idprom.h>
+#include <asm/machines.h>
+
+#ifdef CONFIG_SUN3
+#include <asm/sun3mmu.h>
+#else
+#include <asm/sun3xprom.h>
+#endif
+
+/* sun3/60 addr/irq for the lance chip.  If your sun is different,
+   change this. */
+#define LANCE_OBIO 0x120000
+#define LANCE_IRQ IRQ_AUTO_3
+
+/* Debug level:
+ *  0 = silent, print only serious errors
+ *  1 = normal, print error messages
+ *  2 = debug, print debug infos
+ *  3 = debug, print even more debug infos (packet data)
+ */
+
+#define	LANCE_DEBUG	0
+
+#ifdef LANCE_DEBUG
+static int lance_debug = LANCE_DEBUG;
+#else
+static int lance_debug = 1;
+#endif
+module_param(lance_debug, int, 0);
+MODULE_PARM_DESC(lance_debug, "SUN3 Lance debug level (0-3)");
+MODULE_LICENSE("GPL");
+
+#define	DPRINTK(n,a) \
+	do {  \
+		if (lance_debug >= n)  \
+			printk a; \
+	} while( 0 )
+
+
+/* we're only using 32k of memory, so we use 4 TX
+   buffers and 16 RX buffers.  These values are expressed as log2. */
+
+#define TX_LOG_RING_SIZE			3
+#define RX_LOG_RING_SIZE			5
+
+/* These are the derived values */
+
+#define TX_RING_SIZE			(1 << TX_LOG_RING_SIZE)
+#define TX_RING_LEN_BITS		(TX_LOG_RING_SIZE << 5)
+#define	TX_RING_MOD_MASK		(TX_RING_SIZE - 1)
+
+#define RX_RING_SIZE			(1 << RX_LOG_RING_SIZE)
+#define RX_RING_LEN_BITS		(RX_LOG_RING_SIZE << 5)
+#define	RX_RING_MOD_MASK		(RX_RING_SIZE - 1)
+
+/* Definitions for packet buffer access: */
+#define PKT_BUF_SZ		1544
+
+/* Get the address of a packet buffer corresponding to a given buffer head */
+#define	PKTBUF_ADDR(head)	(void *)((unsigned long)(MEM) | (head)->base)
+
+
+/* The LANCE Rx and Tx ring descriptors. */
+struct lance_rx_head {
+	unsigned short	base;		/* Low word of base addr */
+	volatile unsigned char	flag;
+	unsigned char  base_hi;	/* High word of base addr (unused) */
+	short buf_length;	/* This length is 2s complement! */
+	volatile short msg_length;	/* This length is "normal". */
+};
+
+struct lance_tx_head {
+	unsigned short base;		/* Low word of base addr */
+	volatile unsigned char	flag;
+	unsigned char base_hi;	/* High word of base addr (unused) */
+	short length;		/* Length is 2s complement! */
+	volatile short misc;
+};
+
+/* The LANCE initialization block, described in databook. */
+struct lance_init_block {
+	unsigned short	mode;		/* Pre-set mode */
+	unsigned char	hwaddr[6];	/* Physical ethernet address */
+	unsigned int    filter[2];	/* Multicast filter (unused). */
+	/* Receive and transmit ring base, along with length bits. */
+	unsigned short rdra;
+	unsigned short rlen;
+	unsigned short tdra;
+	unsigned short tlen;
+	unsigned short pad[4]; /* is thie needed? */
+};
+
+/* The whole layout of the Lance shared memory */
+struct lance_memory {
+	struct lance_init_block	init;
+	struct lance_tx_head	tx_head[TX_RING_SIZE];
+	struct lance_rx_head	rx_head[RX_RING_SIZE];
+	char   rx_data[RX_RING_SIZE][PKT_BUF_SZ];
+	char   tx_data[TX_RING_SIZE][PKT_BUF_SZ];
+};
+
+/* The driver's private device structure */
+
+struct lance_private {
+	volatile unsigned short	*iobase;
+	struct lance_memory	*mem;
+     	int new_rx, new_tx;	/* The next free ring entry */
+	int old_tx, old_rx;     /* ring entry to be processed */
+/* These two must be longs for set_bit() */
+	long	    tx_full;
+	long	    lock;
+};
+
+/* I/O register access macros */
+
+#define	MEM	lp->mem
+#define	DREG	lp->iobase[0]
+#define	AREG	lp->iobase[1]
+#define	REGA(a)	(*( AREG = (a), &DREG ))
+
+/* Definitions for the Lance */
+
+/* tx_head flags */
+#define TMD1_ENP		0x01	/* end of packet */
+#define TMD1_STP		0x02	/* start of packet */
+#define TMD1_DEF		0x04	/* deferred */
+#define TMD1_ONE		0x08	/* one retry needed */
+#define TMD1_MORE		0x10	/* more than one retry needed */
+#define TMD1_ERR		0x40	/* error summary */
+#define TMD1_OWN 		0x80	/* ownership (set: chip owns) */
+
+#define TMD1_OWN_CHIP	TMD1_OWN
+#define TMD1_OWN_HOST	0
+
+/* tx_head misc field */
+#define TMD3_TDR		0x03FF	/* Time Domain Reflectometry counter */
+#define TMD3_RTRY		0x0400	/* failed after 16 retries */
+#define TMD3_LCAR		0x0800	/* carrier lost */
+#define TMD3_LCOL		0x1000	/* late collision */
+#define TMD3_UFLO		0x4000	/* underflow (late memory) */
+#define TMD3_BUFF		0x8000	/* buffering error (no ENP) */
+
+/* rx_head flags */
+#define RMD1_ENP		0x01	/* end of packet */
+#define RMD1_STP		0x02	/* start of packet */
+#define RMD1_BUFF		0x04	/* buffer error */
+#define RMD1_CRC		0x08	/* CRC error */
+#define RMD1_OFLO		0x10	/* overflow */
+#define RMD1_FRAM		0x20	/* framing error */
+#define RMD1_ERR		0x40	/* error summary */
+#define RMD1_OWN 		0x80	/* ownership (set: ship owns) */
+
+#define RMD1_OWN_CHIP	RMD1_OWN
+#define RMD1_OWN_HOST	0
+
+/* register names */
+#define CSR0	0		/* mode/status */
+#define CSR1	1		/* init block addr (low) */
+#define CSR2	2		/* init block addr (high) */
+#define CSR3	3		/* misc */
+#define CSR8	8	  	/* address filter */
+#define CSR15	15		/* promiscuous mode */
+
+/* CSR0 */
+/* (R=readable, W=writeable, S=set on write, C=clear on write) */
+#define CSR0_INIT	0x0001		/* initialize (RS) */
+#define CSR0_STRT	0x0002		/* start (RS) */
+#define CSR0_STOP	0x0004		/* stop (RS) */
+#define CSR0_TDMD	0x0008		/* transmit demand (RS) */
+#define CSR0_TXON	0x0010		/* transmitter on (R) */
+#define CSR0_RXON	0x0020		/* receiver on (R) */
+#define CSR0_INEA	0x0040		/* interrupt enable (RW) */
+#define CSR0_INTR	0x0080		/* interrupt active (R) */
+#define CSR0_IDON	0x0100		/* initialization done (RC) */
+#define CSR0_TINT	0x0200		/* transmitter interrupt (RC) */
+#define CSR0_RINT	0x0400		/* receiver interrupt (RC) */
+#define CSR0_MERR	0x0800		/* memory error (RC) */
+#define CSR0_MISS	0x1000		/* missed frame (RC) */
+#define CSR0_CERR	0x2000		/* carrier error (no heartbeat :-) (RC) */
+#define CSR0_BABL	0x4000		/* babble: tx-ed too many bits (RC) */
+#define CSR0_ERR	0x8000		/* error (RC) */
+
+/* CSR3 */
+#define CSR3_BCON	0x0001		/* byte control */
+#define CSR3_ACON	0x0002		/* ALE control */
+#define CSR3_BSWP	0x0004		/* byte swap (1=big endian) */
+
+/***************************** Prototypes *****************************/
+
+static int lance_probe( struct net_device *dev);
+static int lance_open( struct net_device *dev );
+static void lance_init_ring( struct net_device *dev );
+static int lance_start_xmit( struct sk_buff *skb, struct net_device *dev );
+static irqreturn_t lance_interrupt( int irq, void *dev_id);
+static int lance_rx( struct net_device *dev );
+static int lance_close( struct net_device *dev );
+static void set_multicast_list( struct net_device *dev );
+
+/************************* End of Prototypes **************************/
+
+struct net_device * __init sun3lance_probe(int unit)
+{
+	struct net_device *dev;
+	static int found;
+	int err = -ENODEV;
+
+	if (!MACH_IS_SUN3 && !MACH_IS_SUN3X)
+		return ERR_PTR(-ENODEV);
+
+	/* check that this machine has an onboard lance */
+	switch(idprom->id_machtype) {
+	case SM_SUN3|SM_3_50:
+	case SM_SUN3|SM_3_60:
+	case SM_SUN3X|SM_3_80:
+		/* these machines have lance */
+		break;
+
+	default:
+		return ERR_PTR(-ENODEV);
+	}
+
+	if (found)
+		return ERR_PTR(-ENODEV);
+
+	dev = alloc_etherdev(sizeof(struct lance_private));
+	if (!dev)
+		return ERR_PTR(-ENOMEM);
+	if (unit >= 0) {
+		sprintf(dev->name, "eth%d", unit);
+		netdev_boot_setup_check(dev);
+	}
+
+	if (!lance_probe(dev))
+		goto out;
+
+	err = register_netdev(dev);
+	if (err)
+		goto out1;
+	found = 1;
+	return dev;
+
+out1:
+#ifdef CONFIG_SUN3
+	iounmap((void __iomem *)dev->base_addr);
+#endif
+out:
+	free_netdev(dev);
+	return ERR_PTR(err);
+}
+
+static const struct net_device_ops lance_netdev_ops = {
+	.ndo_open		= lance_open,
+	.ndo_stop		= lance_close,
+	.ndo_start_xmit		= lance_start_xmit,
+	.ndo_set_rx_mode	= set_multicast_list,
+	.ndo_set_mac_address	= NULL,
+	.ndo_change_mtu		= eth_change_mtu,
+	.ndo_validate_addr	= eth_validate_addr,
+};
+
+static int __init lance_probe( struct net_device *dev)
+{
+	unsigned long ioaddr;
+
+	struct lance_private	*lp;
+	int 			i;
+	static int 		did_version;
+	volatile unsigned short *ioaddr_probe;
+	unsigned short tmp1, tmp2;
+
+#ifdef CONFIG_SUN3
+	ioaddr = (unsigned long)ioremap(LANCE_OBIO, PAGE_SIZE);
+	if (!ioaddr)
+		return 0;
+#else
+	ioaddr = SUN3X_LANCE;
+#endif
+
+	/* test to see if there's really a lance here */
+	/* (CSRO_INIT shouldn't be readable) */
+
+	ioaddr_probe = (volatile unsigned short *)ioaddr;
+	tmp1 = ioaddr_probe[0];
+	tmp2 = ioaddr_probe[1];
+
+	ioaddr_probe[1] = CSR0;
+	ioaddr_probe[0] = CSR0_INIT | CSR0_STOP;
+
+	if(ioaddr_probe[0] != CSR0_STOP) {
+		ioaddr_probe[0] = tmp1;
+		ioaddr_probe[1] = tmp2;
+
+#ifdef CONFIG_SUN3
+		iounmap((void __iomem *)ioaddr);
+#endif
+		return 0;
+	}
+
+	lp = netdev_priv(dev);
+
+	/* XXX - leak? */
+	MEM = dvma_malloc_align(sizeof(struct lance_memory), 0x10000);
+	if (MEM == NULL) {
+#ifdef CONFIG_SUN3
+		iounmap((void __iomem *)ioaddr);
+#endif
+		printk(KERN_WARNING "SUN3 Lance couldn't allocate DVMA memory\n");
+		return 0;
+	}
+
+	lp->iobase = (volatile unsigned short *)ioaddr;
+	dev->base_addr = (unsigned long)ioaddr; /* informational only */
+
+	REGA(CSR0) = CSR0_STOP;
+
+	if (request_irq(LANCE_IRQ, lance_interrupt, 0, "SUN3 Lance", dev) < 0) {
+#ifdef CONFIG_SUN3
+		iounmap((void __iomem *)ioaddr);
+#endif
+		dvma_free((void *)MEM);
+		printk(KERN_WARNING "SUN3 Lance unable to allocate IRQ\n");
+		return 0;
+	}
+	dev->irq = (unsigned short)LANCE_IRQ;
+
+
+	printk("%s: SUN3 Lance at io %#lx, mem %#lx, irq %d, hwaddr ",
+		   dev->name,
+		   (unsigned long)ioaddr,
+		   (unsigned long)MEM,
+		   dev->irq);
+
+	/* copy in the ethernet address from the prom */
+	for(i = 0; i < 6 ; i++)
+	     dev->dev_addr[i] = idprom->id_ethaddr[i];
+
+	/* tell the card it's ether address, bytes swapped */
+	MEM->init.hwaddr[0] = dev->dev_addr[1];
+	MEM->init.hwaddr[1] = dev->dev_addr[0];
+	MEM->init.hwaddr[2] = dev->dev_addr[3];
+	MEM->init.hwaddr[3] = dev->dev_addr[2];
+	MEM->init.hwaddr[4] = dev->dev_addr[5];
+	MEM->init.hwaddr[5] = dev->dev_addr[4];
+
+	printk("%pM\n", dev->dev_addr);
+
+	MEM->init.mode = 0x0000;
+	MEM->init.filter[0] = 0x00000000;
+	MEM->init.filter[1] = 0x00000000;
+	MEM->init.rdra = dvma_vtob(MEM->rx_head);
+	MEM->init.rlen    = (RX_LOG_RING_SIZE << 13) |
+		(dvma_vtob(MEM->rx_head) >> 16);
+	MEM->init.tdra = dvma_vtob(MEM->tx_head);
+	MEM->init.tlen    = (TX_LOG_RING_SIZE << 13) |
+		(dvma_vtob(MEM->tx_head) >> 16);
+
+	DPRINTK(2, ("initaddr: %08lx rx_ring: %08lx tx_ring: %08lx\n",
+	       dvma_vtob(&(MEM->init)), dvma_vtob(MEM->rx_head),
+	       (dvma_vtob(MEM->tx_head))));
+
+	if (did_version++ == 0)
+		printk( version );
+
+	dev->netdev_ops = &lance_netdev_ops;
+//	KLUDGE -- REMOVE ME
+	set_bit(__LINK_STATE_PRESENT, &dev->state);
+
+
+	return 1;
+}
+
+static int lance_open( struct net_device *dev )
+{
+	struct lance_private *lp = netdev_priv(dev);
+	int i;
+
+	DPRINTK( 2, ( "%s: lance_open()\n", dev->name ));
+
+	REGA(CSR0) = CSR0_STOP;
+
+	lance_init_ring(dev);
+
+	/* From now on, AREG is kept to point to CSR0 */
+	REGA(CSR0) = CSR0_INIT;
+
+	i = 1000000;
+	while (--i > 0)
+		if (DREG & CSR0_IDON)
+			break;
+	if (i <= 0 || (DREG & CSR0_ERR)) {
+		DPRINTK( 2, ( "lance_open(): opening %s failed, i=%d, csr0=%04x\n",
+					  dev->name, i, DREG ));
+		DREG = CSR0_STOP;
+		return -EIO;
+	}
+
+	DREG = CSR0_IDON | CSR0_STRT | CSR0_INEA;
+
+	netif_start_queue(dev);
+
+	DPRINTK( 2, ( "%s: LANCE is open, csr0 %04x\n", dev->name, DREG ));
+
+	return 0;
+}
+
+
+/* Initialize the LANCE Rx and Tx rings. */
+
+static void lance_init_ring( struct net_device *dev )
+{
+	struct lance_private *lp = netdev_priv(dev);
+	int i;
+
+	lp->lock = 0;
+	lp->tx_full = 0;
+	lp->new_rx = lp->new_tx = 0;
+	lp->old_rx = lp->old_tx = 0;
+
+	for( i = 0; i < TX_RING_SIZE; i++ ) {
+		MEM->tx_head[i].base = dvma_vtob(MEM->tx_data[i]);
+		MEM->tx_head[i].flag = 0;
+ 		MEM->tx_head[i].base_hi =
+			(dvma_vtob(MEM->tx_data[i])) >>16;
+		MEM->tx_head[i].length = 0;
+		MEM->tx_head[i].misc = 0;
+	}
+
+	for( i = 0; i < RX_RING_SIZE; i++ ) {
+		MEM->rx_head[i].base = dvma_vtob(MEM->rx_data[i]);
+		MEM->rx_head[i].flag = RMD1_OWN_CHIP;
+		MEM->rx_head[i].base_hi =
+			(dvma_vtob(MEM->rx_data[i])) >> 16;
+		MEM->rx_head[i].buf_length = -PKT_BUF_SZ | 0xf000;
+		MEM->rx_head[i].msg_length = 0;
+	}
+
+	/* tell the card it's ether address, bytes swapped */
+	MEM->init.hwaddr[0] = dev->dev_addr[1];
+	MEM->init.hwaddr[1] = dev->dev_addr[0];
+	MEM->init.hwaddr[2] = dev->dev_addr[3];
+	MEM->init.hwaddr[3] = dev->dev_addr[2];
+	MEM->init.hwaddr[4] = dev->dev_addr[5];
+	MEM->init.hwaddr[5] = dev->dev_addr[4];
+
+	MEM->init.mode = 0x0000;
+	MEM->init.filter[0] = 0x00000000;
+	MEM->init.filter[1] = 0x00000000;
+	MEM->init.rdra = dvma_vtob(MEM->rx_head);
+	MEM->init.rlen    = (RX_LOG_RING_SIZE << 13) |
+		(dvma_vtob(MEM->rx_head) >> 16);
+	MEM->init.tdra = dvma_vtob(MEM->tx_head);
+	MEM->init.tlen    = (TX_LOG_RING_SIZE << 13) |
+		(dvma_vtob(MEM->tx_head) >> 16);
+
+
+	/* tell the lance the address of its init block */
+	REGA(CSR1) = dvma_vtob(&(MEM->init));
+	REGA(CSR2) = dvma_vtob(&(MEM->init)) >> 16;
+
+#ifdef CONFIG_SUN3X
+	REGA(CSR3) = CSR3_BSWP | CSR3_ACON | CSR3_BCON;
+#else
+	REGA(CSR3) = CSR3_BSWP;
+#endif
+
+}
+
+
+static int lance_start_xmit( struct sk_buff *skb, struct net_device *dev )
+{
+	struct lance_private *lp = netdev_priv(dev);
+	int entry, len;
+	struct lance_tx_head *head;
+	unsigned long flags;
+
+	DPRINTK( 1, ( "%s: transmit start.\n",
+		      dev->name));
+
+	/* Transmitter timeout, serious problems. */
+	if (netif_queue_stopped(dev)) {
+		int tickssofar = jiffies - dev_trans_start(dev);
+		if (tickssofar < HZ/5)
+			return NETDEV_TX_BUSY;
+
+		DPRINTK( 1, ( "%s: transmit timed out, status %04x, resetting.\n",
+					  dev->name, DREG ));
+		DREG = CSR0_STOP;
+		/*
+		 * Always set BSWP after a STOP as STOP puts it back into
+		 * little endian mode.
+		 */
+		REGA(CSR3) = CSR3_BSWP;
+		dev->stats.tx_errors++;
+
+		if(lance_debug >= 2) {
+			int i;
+			printk("Ring data: old_tx %d new_tx %d%s new_rx %d\n",
+			       lp->old_tx, lp->new_tx,
+			       lp->tx_full ? " (full)" : "",
+			       lp->new_rx );
+			for( i = 0 ; i < RX_RING_SIZE; i++ )
+				printk( "rx #%d: base=%04x blen=%04x mlen=%04x\n",
+					i, MEM->rx_head[i].base,
+					-MEM->rx_head[i].buf_length,
+					MEM->rx_head[i].msg_length);
+			for( i = 0 ; i < TX_RING_SIZE; i++ )
+				printk("tx #%d: base=%04x len=%04x misc=%04x\n",
+				       i, MEM->tx_head[i].base,
+				       -MEM->tx_head[i].length,
+				       MEM->tx_head[i].misc );
+		}
+
+		lance_init_ring(dev);
+		REGA( CSR0 ) = CSR0_INEA | CSR0_INIT | CSR0_STRT;
+
+		netif_start_queue(dev);
+
+		return NETDEV_TX_OK;
+	}
+
+
+	/* Block a timer-based transmit from overlapping.  This could better be
+	   done with atomic_swap(1, dev->tbusy), but set_bit() works as well. */
+
+	/* Block a timer-based transmit from overlapping with us by
+	   stopping the queue for a bit... */
+
+	netif_stop_queue(dev);
+
+	if (test_and_set_bit( 0, (void*)&lp->lock ) != 0) {
+		printk( "%s: tx queue lock!.\n", dev->name);
+		/* don't clear dev->tbusy flag. */
+		return NETDEV_TX_BUSY;
+	}
+
+	AREG = CSR0;
+  	DPRINTK( 2, ( "%s: lance_start_xmit() called, csr0 %4.4x.\n",
+  				  dev->name, DREG ));
+
+#ifdef CONFIG_SUN3X
+	/* this weirdness doesn't appear on sun3... */
+	if(!(DREG & CSR0_INIT)) {
+		DPRINTK( 1, ("INIT not set, reinitializing...\n"));
+		REGA( CSR0 ) = CSR0_STOP;
+		lance_init_ring(dev);
+		REGA( CSR0 ) = CSR0_INIT | CSR0_STRT;
+	}
+#endif
+
+	/* Fill in a Tx ring entry */
+#if 0
+	if (lance_debug >= 2) {
+		printk( "%s: TX pkt %d type 0x%04x"
+			" from %s to %s"
+			" data at 0x%08x len %d\n",
+			dev->name, lp->new_tx, ((u_short *)skb->data)[6],
+			DEV_ADDR(&skb->data[6]), DEV_ADDR(skb->data),
+			(int)skb->data, (int)skb->len );
+	}
+#endif
+	/* We're not prepared for the int until the last flags are set/reset.
+	 * And the int may happen already after setting the OWN_CHIP... */
+	local_irq_save(flags);
+
+	/* Mask to ring buffer boundary. */
+	entry = lp->new_tx;
+	head  = &(MEM->tx_head[entry]);
+
+	/* Caution: the write order is important here, set the "ownership" bits
+	 * last.
+	 */
+
+	/* the sun3's lance needs it's buffer padded to the minimum
+	   size */
+	len = (ETH_ZLEN < skb->len) ? skb->len : ETH_ZLEN;
+
+//	head->length = -len;
+	head->length = (-len) | 0xf000;
+	head->misc = 0;
+
+	skb_copy_from_linear_data(skb, PKTBUF_ADDR(head), skb->len);
+	if (len != skb->len)
+		memset(PKTBUF_ADDR(head) + skb->len, 0, len-skb->len);
+
+	head->flag = TMD1_OWN_CHIP | TMD1_ENP | TMD1_STP;
+	lp->new_tx = (lp->new_tx + 1) & TX_RING_MOD_MASK;
+	dev->stats.tx_bytes += skb->len;
+
+	/* Trigger an immediate send poll. */
+	REGA(CSR0) = CSR0_INEA | CSR0_TDMD | CSR0_STRT;
+	AREG = CSR0;
+  	DPRINTK( 2, ( "%s: lance_start_xmit() exiting, csr0 %4.4x.\n",
+  				  dev->name, DREG ));
+	dev_kfree_skb(skb);
+
+	lp->lock = 0;
+	if ((MEM->tx_head[(entry+1) & TX_RING_MOD_MASK].flag & TMD1_OWN) ==
+	    TMD1_OWN_HOST)
+		netif_start_queue(dev);
+
+	local_irq_restore(flags);
+
+	return NETDEV_TX_OK;
+}
+
+/* The LANCE interrupt handler. */
+
+static irqreturn_t lance_interrupt( int irq, void *dev_id)
+{
+	struct net_device *dev = dev_id;
+	struct lance_private *lp = netdev_priv(dev);
+	int csr0;
+	static int in_interrupt;
+
+	if (dev == NULL) {
+		DPRINTK( 1, ( "lance_interrupt(): invalid dev_id\n" ));
+		return IRQ_NONE;
+	}
+
+	if (in_interrupt)
+		DPRINTK( 2, ( "%s: Re-entering the interrupt handler.\n", dev->name ));
+	in_interrupt = 1;
+
+ still_more:
+	flush_cache_all();
+
+	AREG = CSR0;
+	csr0 = DREG;
+
+	/* ack interrupts */
+	DREG = csr0 & (CSR0_TINT | CSR0_RINT | CSR0_IDON);
+
+	/* clear errors */
+	if(csr0 & CSR0_ERR)
+		DREG = CSR0_BABL | CSR0_MERR | CSR0_CERR | CSR0_MISS;
+
+
+	DPRINTK( 2, ( "%s: interrupt  csr0=%04x new csr=%04x.\n",
+		      dev->name, csr0, DREG ));
+
+	if (csr0 & CSR0_TINT) {			/* Tx-done interrupt */
+		int old_tx = lp->old_tx;
+
+//		if(lance_debug >= 3) {
+//			int i;
+//
+//			printk("%s: tx int\n", dev->name);
+//
+//			for(i = 0; i < TX_RING_SIZE; i++)
+//				printk("ring %d flag=%04x\n", i,
+//				       MEM->tx_head[i].flag);
+//		}
+
+		while( old_tx != lp->new_tx) {
+			struct lance_tx_head *head = &(MEM->tx_head[old_tx]);
+
+			DPRINTK(3, ("on tx_ring %d\n", old_tx));
+
+			if (head->flag & TMD1_OWN_CHIP)
+				break; /* It still hasn't been Txed */
+
+			if (head->flag & TMD1_ERR) {
+				int status = head->misc;
+				dev->stats.tx_errors++;
+				if (status & TMD3_RTRY) dev->stats.tx_aborted_errors++;
+				if (status & TMD3_LCAR) dev->stats.tx_carrier_errors++;
+				if (status & TMD3_LCOL) dev->stats.tx_window_errors++;
+				if (status & (TMD3_UFLO | TMD3_BUFF)) {
+					dev->stats.tx_fifo_errors++;
+					printk("%s: Tx FIFO error\n",
+					       dev->name);
+					REGA(CSR0) = CSR0_STOP;
+					REGA(CSR3) = CSR3_BSWP;
+					lance_init_ring(dev);
+					REGA(CSR0) = CSR0_STRT | CSR0_INEA;
+					return IRQ_HANDLED;
+				}
+			} else if(head->flag & (TMD1_ENP | TMD1_STP)) {
+
+				head->flag &= ~(TMD1_ENP | TMD1_STP);
+				if(head->flag & (TMD1_ONE | TMD1_MORE))
+					dev->stats.collisions++;
+
+				dev->stats.tx_packets++;
+				DPRINTK(3, ("cleared tx ring %d\n", old_tx));
+			}
+			old_tx = (old_tx +1) & TX_RING_MOD_MASK;
+		}
+
+		lp->old_tx = old_tx;
+	}
+
+
+	if (netif_queue_stopped(dev)) {
+		/* The ring is no longer full, clear tbusy. */
+		netif_start_queue(dev);
+		netif_wake_queue(dev);
+	}
+
+	if (csr0 & CSR0_RINT)			/* Rx interrupt */
+		lance_rx( dev );
+
+	/* Log misc errors. */
+	if (csr0 & CSR0_BABL) dev->stats.tx_errors++; /* Tx babble. */
+	if (csr0 & CSR0_MISS) dev->stats.rx_errors++; /* Missed a Rx frame. */
+	if (csr0 & CSR0_MERR) {
+		DPRINTK( 1, ( "%s: Bus master arbitration failure (?!?), "
+			      "status %04x.\n", dev->name, csr0 ));
+		/* Restart the chip. */
+		REGA(CSR0) = CSR0_STOP;
+		REGA(CSR3) = CSR3_BSWP;
+		lance_init_ring(dev);
+		REGA(CSR0) = CSR0_STRT | CSR0_INEA;
+	}
+
+
+    /* Clear any other interrupt, and set interrupt enable. */
+//	DREG = CSR0_BABL | CSR0_CERR | CSR0_MISS | CSR0_MERR |
+//		   CSR0_IDON | CSR0_INEA;
+
+	REGA(CSR0) = CSR0_INEA;
+
+	if(DREG & (CSR0_RINT | CSR0_TINT)) {
+	     DPRINTK(2, ("restarting interrupt, csr0=%#04x\n", DREG));
+	     goto still_more;
+	}
+
+	DPRINTK( 2, ( "%s: exiting interrupt, csr0=%#04x.\n",
+				  dev->name, DREG ));
+	in_interrupt = 0;
+	return IRQ_HANDLED;
+}
+
+/* get packet, toss into skbuff */
+static int lance_rx( struct net_device *dev )
+{
+	struct lance_private *lp = netdev_priv(dev);
+	int entry = lp->new_rx;
+
+	/* If we own the next entry, it's a new packet. Send it up. */
+	while( (MEM->rx_head[entry].flag & RMD1_OWN) == RMD1_OWN_HOST ) {
+		struct lance_rx_head *head = &(MEM->rx_head[entry]);
+		int status = head->flag;
+
+		if (status != (RMD1_ENP|RMD1_STP)) {  /* There was an error. */
+			/* There is a tricky error noted by John Murphy,
+			   <murf@perftech.com> to Russ Nelson: Even with
+			   full-sized buffers it's possible for a jabber packet to use two
+			   buffers, with only the last correctly noting the error. */
+			if (status & RMD1_ENP)	/* Only count a general error at the */
+				dev->stats.rx_errors++; /* end of a packet.*/
+			if (status & RMD1_FRAM) dev->stats.rx_frame_errors++;
+			if (status & RMD1_OFLO) dev->stats.rx_over_errors++;
+			if (status & RMD1_CRC) dev->stats.rx_crc_errors++;
+			if (status & RMD1_BUFF) dev->stats.rx_fifo_errors++;
+			head->flag &= (RMD1_ENP|RMD1_STP);
+		} else {
+			/* Malloc up new buffer, compatible with net-3. */
+//			short pkt_len = head->msg_length;// & 0xfff;
+			short pkt_len = (head->msg_length & 0xfff) - 4;
+			struct sk_buff *skb;
+
+			if (pkt_len < 60) {
+				printk( "%s: Runt packet!\n", dev->name );
+				dev->stats.rx_errors++;
+			}
+			else {
+				skb = netdev_alloc_skb(dev, pkt_len + 2);
+				if (skb == NULL) {
+					dev->stats.rx_dropped++;
+					head->msg_length = 0;
+					head->flag |= RMD1_OWN_CHIP;
+					lp->new_rx = (lp->new_rx+1) &
+					     RX_RING_MOD_MASK;
+				}
+
+#if 0
+				if (lance_debug >= 3) {
+					u_char *data = PKTBUF_ADDR(head);
+					printk("%s: RX pkt %d type 0x%04x"
+					       " from %pM to %pM",
+					       dev->name, lp->new_tx, ((u_short *)data)[6],
+					       &data[6], data);
+
+					printk(" data %02x %02x %02x %02x %02x %02x %02x %02x "
+					       "len %d at %08x\n",
+					       data[15], data[16], data[17], data[18],
+					       data[19], data[20], data[21], data[22],
+					       pkt_len, data);
+				}
+#endif
+				if (lance_debug >= 3) {
+					u_char *data = PKTBUF_ADDR(head);
+					printk( "%s: RX pkt %d type 0x%04x len %d\n ", dev->name, entry, ((u_short *)data)[6], pkt_len);
+				}
+
+
+				skb_reserve( skb, 2 );	/* 16 byte align */
+				skb_put( skb, pkt_len );	/* Make room */
+				skb_copy_to_linear_data(skb,
+						 PKTBUF_ADDR(head),
+						 pkt_len);
+
+				skb->protocol = eth_type_trans( skb, dev );
+				netif_rx( skb );
+				dev->stats.rx_packets++;
+				dev->stats.rx_bytes += pkt_len;
+			}
+		}
+
+//		head->buf_length = -PKT_BUF_SZ | 0xf000;
+		head->msg_length = 0;
+		head->flag = RMD1_OWN_CHIP;
+
+		entry = lp->new_rx = (lp->new_rx +1) & RX_RING_MOD_MASK;
+	}
+
+	/* From lance.c (Donald Becker): */
+	/* We should check that at least two ring entries are free.
+	   If not, we should free one and mark stats->rx_dropped++. */
+
+	return 0;
+}
+
+
+static int lance_close( struct net_device *dev )
+{
+	struct lance_private *lp = netdev_priv(dev);
+
+	netif_stop_queue(dev);
+
+	AREG = CSR0;
+
+	DPRINTK( 2, ( "%s: Shutting down ethercard, status was %2.2x.\n",
+				  dev->name, DREG ));
+
+	/* We stop the LANCE here -- it occasionally polls
+	   memory if we don't. */
+	DREG = CSR0_STOP;
+	return 0;
+}
+
+
+/* Set or clear the multicast filter for this adaptor.
+   num_addrs == -1		Promiscuous mode, receive all packets
+   num_addrs == 0		Normal mode, clear multicast list
+   num_addrs > 0		Multicast mode, receive normal and MC packets, and do
+						best-effort filtering.
+ */
+
+/* completely untested on a sun3 */
+static void set_multicast_list( struct net_device *dev )
+{
+	struct lance_private *lp = netdev_priv(dev);
+
+	if(netif_queue_stopped(dev))
+		/* Only possible if board is already started */
+		return;
+
+	/* We take the simple way out and always enable promiscuous mode. */
+	DREG = CSR0_STOP; /* Temporarily stop the lance. */
+
+	if (dev->flags & IFF_PROMISC) {
+		/* Log any net taps. */
+		DPRINTK( 3, ( "%s: Promiscuous mode enabled.\n", dev->name ));
+		REGA( CSR15 ) = 0x8000; /* Set promiscuous mode */
+	} else {
+		short multicast_table[4];
+		int num_addrs = netdev_mc_count(dev);
+		int i;
+		/* We don't use the multicast table, but rely on upper-layer
+		 * filtering. */
+		memset( multicast_table, (num_addrs == 0) ? 0 : -1,
+				sizeof(multicast_table) );
+		for( i = 0; i < 4; i++ )
+			REGA( CSR8+i ) = multicast_table[i];
+		REGA( CSR15 ) = 0; /* Unset promiscuous mode */
+	}
+
+	/*
+	 * Always set BSWP after a STOP as STOP puts it back into
+	 * little endian mode.
+	 */
+	REGA( CSR3 ) = CSR3_BSWP;
+
+	/* Resume normal operation and reset AREG to CSR0 */
+	REGA( CSR0 ) = CSR0_IDON | CSR0_INEA | CSR0_STRT;
+}
+
+
+#ifdef MODULE
+
+static struct net_device *sun3lance_dev;
+
+int __init init_module(void)
+{
+	sun3lance_dev = sun3lance_probe(-1);
+	return PTR_ERR_OR_ZERO(sun3lance_dev);
+}
+
+void __exit cleanup_module(void)
+{
+	unregister_netdev(sun3lance_dev);
+#ifdef CONFIG_SUN3
+	iounmap((void __iomem *)sun3lance_dev->base_addr);
+#endif
+	free_netdev(sun3lance_dev);
+}
+
+#endif /* MODULE */
+