Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 878 insertions, 0 deletions

diff --git a/drivers/net/ariadne.c b/drivers/net/ariadne.c
new file mode 100644
index 0000000..9fe93ac
--- /dev/null
+++ b/drivers/net/ariadne.c
@@ -0,0 +1,878 @@
+/*
+ *  Amiga Linux/m68k Ariadne Ethernet Driver
+ *
+ *  © Copyright 1995-2003 by Geert Uytterhoeven (geert@linux-m68k.org)
+ *			     Peter De Schrijver (p2@mind.be)
+ *
+ *  ---------------------------------------------------------------------------
+ *
+ *  This program is based on
+ *
+ *	lance.c:	An AMD LANCE ethernet driver for linux.
+ *			Written 1993-94 by Donald Becker.
+ *
+ *	Am79C960:	PCnet(tm)-ISA Single-Chip Ethernet Controller
+ *			Advanced Micro Devices
+ *			Publication #16907, Rev. B, Amendment/0, May 1994
+ *
+ *	MC68230:	Parallel Interface/Timer (PI/T)
+ *			Motorola Semiconductors, December, 1983
+ *
+ *  ---------------------------------------------------------------------------
+ *
+ *  This file is subject to the terms and conditions of the GNU General Public
+ *  License.  See the file COPYING in the main directory of the Linux
+ *  distribution for more details.
+ *
+ *  ---------------------------------------------------------------------------
+ *
+ *  The Ariadne is a Zorro-II board made by Village Tronic. It contains:
+ *
+ *	- an Am79C960 PCnet-ISA Single-Chip Ethernet Controller with both
+ *	  10BASE-2 (thin coax) and 10BASE-T (UTP) connectors
+ *
+ *	- an MC68230 Parallel Interface/Timer configured as 2 parallel ports
+ */
+
+#include <linux/module.h>
+#include <linux/stddef.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/interrupt.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/zorro.h>
+#include <linux/bitops.h>
+
+#include <asm/amigaints.h>
+#include <asm/amigahw.h>
+#include <asm/irq.h>
+
+#include "ariadne.h"
+
+
+#ifdef ARIADNE_DEBUG
+int ariadne_debug = ARIADNE_DEBUG;
+#else
+int ariadne_debug = 1;
+#endif
+
+
+    /*
+     *	Macros to Fix Endianness problems
+     */
+
+				/* Swap the Bytes in a WORD */
+#define swapw(x)	(((x>>8)&0x00ff)|((x<<8)&0xff00))
+				/* Get the Low BYTE in a WORD */
+#define lowb(x)		(x&0xff)
+				/* Get the Swapped High WORD in a LONG */
+#define swhighw(x)	((((x)>>8)&0xff00)|(((x)>>24)&0x00ff))
+				/* Get the Swapped Low WORD in a LONG */
+#define swloww(x)	((((x)<<8)&0xff00)|(((x)>>8)&0x00ff))
+
+
+    /*
+     *	Transmit/Receive Ring Definitions
+     */
+
+#define TX_RING_SIZE	5
+#define RX_RING_SIZE	16
+
+#define PKT_BUF_SIZE	1520
+
+
+    /*
+     *	Private Device Data
+     */
+
+struct ariadne_private {
+    volatile struct TDRE *tx_ring[TX_RING_SIZE];
+    volatile struct RDRE *rx_ring[RX_RING_SIZE];
+    volatile u_short *tx_buff[TX_RING_SIZE];
+    volatile u_short *rx_buff[RX_RING_SIZE];
+    int cur_tx, cur_rx;			/* The next free ring entry */
+    int dirty_tx;			/* The ring entries to be free()ed. */
+    struct net_device_stats stats;
+    char tx_full;
+};
+
+
+    /*
+     *	Structure Created in the Ariadne's RAM Buffer
+     */
+
+struct lancedata {
+    struct TDRE tx_ring[TX_RING_SIZE];
+    struct RDRE rx_ring[RX_RING_SIZE];
+    u_short tx_buff[TX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
+    u_short rx_buff[RX_RING_SIZE][PKT_BUF_SIZE/sizeof(u_short)];
+};
+
+static int ariadne_open(struct net_device *dev);
+static void ariadne_init_ring(struct net_device *dev);
+static int ariadne_start_xmit(struct sk_buff *skb, struct net_device *dev);
+static void ariadne_tx_timeout(struct net_device *dev);
+static int ariadne_rx(struct net_device *dev);
+static void ariadne_reset(struct net_device *dev);
+static irqreturn_t ariadne_interrupt(int irq, void *data, struct pt_regs *fp);
+static int ariadne_close(struct net_device *dev);
+static struct net_device_stats *ariadne_get_stats(struct net_device *dev);
+#ifdef HAVE_MULTICAST
+static void set_multicast_list(struct net_device *dev);
+#endif
+
+
+static void memcpyw(volatile u_short *dest, u_short *src, int len)
+{
+    while (len >= 2) {
+	*(dest++) = *(src++);
+	len -= 2;
+    }
+    if (len == 1)
+	*dest = (*(u_char *)src)<<8;
+}
+
+
+static int __devinit ariadne_init_one(struct zorro_dev *z,
+				      const struct zorro_device_id *ent);
+static void __devexit ariadne_remove_one(struct zorro_dev *z);
+
+
+static struct zorro_device_id ariadne_zorro_tbl[] __devinitdata = {
+    { ZORRO_PROD_VILLAGE_TRONIC_ARIADNE },
+    { 0 }
+};
+
+static struct zorro_driver ariadne_driver = {
+    .name	= "ariadne",
+    .id_table	= ariadne_zorro_tbl,
+    .probe	= ariadne_init_one,
+    .remove	= __devexit_p(ariadne_remove_one),
+};
+
+static int __devinit ariadne_init_one(struct zorro_dev *z,
+				      const struct zorro_device_id *ent)
+{
+    unsigned long board = z->resource.start;
+    unsigned long base_addr = board+ARIADNE_LANCE;
+    unsigned long mem_start = board+ARIADNE_RAM;
+    struct resource *r1, *r2;
+    struct net_device *dev;
+    struct ariadne_private *priv;
+    int err;
+
+    r1 = request_mem_region(base_addr, sizeof(struct Am79C960), "Am79C960");
+    if (!r1)
+	return -EBUSY;
+    r2 = request_mem_region(mem_start, ARIADNE_RAM_SIZE, "RAM");
+    if (!r2) {
+	release_resource(r1);
+	return -EBUSY;
+    }
+
+    dev = alloc_etherdev(sizeof(struct ariadne_private));
+    if (dev == NULL) {
+	release_resource(r1);
+	release_resource(r2);
+	return -ENOMEM;
+    }
+
+    SET_MODULE_OWNER(dev);
+    priv = netdev_priv(dev);
+
+    r1->name = dev->name;
+    r2->name = dev->name;
+
+    dev->dev_addr[0] = 0x00;
+    dev->dev_addr[1] = 0x60;
+    dev->dev_addr[2] = 0x30;
+    dev->dev_addr[3] = (z->rom.er_SerialNumber>>16) & 0xff;
+    dev->dev_addr[4] = (z->rom.er_SerialNumber>>8) & 0xff;
+    dev->dev_addr[5] = z->rom.er_SerialNumber & 0xff;
+    dev->base_addr = ZTWO_VADDR(base_addr);
+    dev->mem_start = ZTWO_VADDR(mem_start);
+    dev->mem_end = dev->mem_start+ARIADNE_RAM_SIZE;
+
+    dev->open = &ariadne_open;
+    dev->stop = &ariadne_close;
+    dev->hard_start_xmit = &ariadne_start_xmit;
+    dev->tx_timeout = &ariadne_tx_timeout;
+    dev->watchdog_timeo = 5*HZ;
+    dev->get_stats = &ariadne_get_stats;
+    dev->set_multicast_list = &set_multicast_list;
+
+    err = register_netdev(dev);
+    if (err) {
+	release_resource(r1);
+	release_resource(r2);
+	free_netdev(dev);
+	return err;
+    }
+    zorro_set_drvdata(z, dev);
+
+    printk(KERN_INFO "%s: Ariadne at 0x%08lx, Ethernet Address "
+	   "%02x:%02x:%02x:%02x:%02x:%02x\n", dev->name, board,
+	   dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
+	   dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
+
+    return 0;
+}
+
+
+static int ariadne_open(struct net_device *dev)
+{
+    volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
+    u_short in;
+    u_long version;
+    int i;
+
+    /* Reset the LANCE */
+    in = lance->Reset;
+
+    /* Stop the LANCE */
+    lance->RAP = CSR0;		/* PCnet-ISA Controller Status */
+    lance->RDP = STOP;
+
+    /* Check the LANCE version */
+    lance->RAP = CSR88;		/* Chip ID */
+    version = swapw(lance->RDP);
+    lance->RAP = CSR89;		/* Chip ID */
+    version |= swapw(lance->RDP)<<16;
+    if ((version & 0x00000fff) != 0x00000003) {
+	printk(KERN_WARNING "ariadne_open: Couldn't find AMD Ethernet Chip\n");
+	return -EAGAIN;
+    }
+    if ((version & 0x0ffff000) != 0x00003000) {
+	printk(KERN_WARNING "ariadne_open: Couldn't find Am79C960 (Wrong part "
+	       "number = %ld)\n", (version & 0x0ffff000)>>12);
+	return -EAGAIN;
+    }
+#if 0
+    printk(KERN_DEBUG "ariadne_open: Am79C960 (PCnet-ISA) Revision %ld\n",
+	   (version & 0xf0000000)>>28);
+#endif
+
+    ariadne_init_ring(dev);
+
+    /* Miscellaneous Stuff */
+    lance->RAP = CSR3;		/* Interrupt Masks and Deferral Control */
+    lance->RDP = 0x0000;
+    lance->RAP = CSR4;		/* Test and Features Control */
+    lance->RDP = DPOLL|APAD_XMT|MFCOM|RCVCCOM|TXSTRTM|JABM;
+
+    /* Set the Multicast Table */
+    lance->RAP = CSR8;		/* Logical Address Filter, LADRF[15:0] */
+    lance->RDP = 0x0000;
+    lance->RAP = CSR9;		/* Logical Address Filter, LADRF[31:16] */
+    lance->RDP = 0x0000;
+    lance->RAP = CSR10;		/* Logical Address Filter, LADRF[47:32] */
+    lance->RDP = 0x0000;
+    lance->RAP = CSR11;		/* Logical Address Filter, LADRF[63:48] */
+    lance->RDP = 0x0000;
+
+    /* Set the Ethernet Hardware Address */
+    lance->RAP = CSR12;		/* Physical Address Register, PADR[15:0] */
+    lance->RDP = ((u_short *)&dev->dev_addr[0])[0];
+    lance->RAP = CSR13;		/* Physical Address Register, PADR[31:16] */
+    lance->RDP = ((u_short *)&dev->dev_addr[0])[1];
+    lance->RAP = CSR14;		/* Physical Address Register, PADR[47:32] */
+    lance->RDP = ((u_short *)&dev->dev_addr[0])[2];
+
+    /* Set the Init Block Mode */
+    lance->RAP = CSR15;		/* Mode Register */
+    lance->RDP = 0x0000;
+
+    /* Set the Transmit Descriptor Ring Pointer */
+    lance->RAP = CSR30;		/* Base Address of Transmit Ring */
+    lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
+    lance->RAP = CSR31;		/* Base Address of transmit Ring */
+    lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_ring));
+
+    /* Set the Receive Descriptor Ring Pointer */
+    lance->RAP = CSR24;		/* Base Address of Receive Ring */
+    lance->RDP = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
+    lance->RAP = CSR25;		/* Base Address of Receive Ring */
+    lance->RDP = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_ring));
+
+    /* Set the Number of RX and TX Ring Entries */
+    lance->RAP = CSR76;		/* Receive Ring Length */
+    lance->RDP = swapw(((u_short)-RX_RING_SIZE));
+    lance->RAP = CSR78;		/* Transmit Ring Length */
+    lance->RDP = swapw(((u_short)-TX_RING_SIZE));
+
+    /* Enable Media Interface Port Auto Select (10BASE-2/10BASE-T) */
+    lance->RAP = ISACSR2;	/* Miscellaneous Configuration */
+    lance->IDP = ASEL;
+
+    /* LED Control */
+    lance->RAP = ISACSR5;	/* LED1 Status */
+    lance->IDP = PSE|XMTE;
+    lance->RAP = ISACSR6;	/* LED2 Status */
+    lance->IDP = PSE|COLE;
+    lance->RAP = ISACSR7;	/* LED3 Status */
+    lance->IDP = PSE|RCVE;
+
+    netif_start_queue(dev);
+
+    i = request_irq(IRQ_AMIGA_PORTS, ariadne_interrupt, SA_SHIRQ,
+                    dev->name, dev);
+    if (i) return i;
+
+    lance->RAP = CSR0;		/* PCnet-ISA Controller Status */
+    lance->RDP = INEA|STRT;
+
+    return 0;
+}
+
+
+static void ariadne_init_ring(struct net_device *dev)
+{
+    struct ariadne_private *priv = netdev_priv(dev);
+    volatile struct lancedata *lancedata = (struct lancedata *)dev->mem_start;
+    int i;
+
+    netif_stop_queue(dev);
+
+    priv->tx_full = 0;
+    priv->cur_rx = priv->cur_tx = 0;
+    priv->dirty_tx = 0;
+
+    /* Set up TX Ring */
+    for (i = 0; i < TX_RING_SIZE; i++) {
+	volatile struct TDRE *t = &lancedata->tx_ring[i];
+	t->TMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i]));
+	t->TMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, tx_buff[i])) |
+		  TF_STP | TF_ENP;
+	t->TMD2 = swapw((u_short)-PKT_BUF_SIZE);
+	t->TMD3 = 0;
+	priv->tx_ring[i] = &lancedata->tx_ring[i];
+	priv->tx_buff[i] = lancedata->tx_buff[i];
+#if 0
+	printk(KERN_DEBUG "TX Entry %2d at %p, Buf at %p\n", i,
+	       &lancedata->tx_ring[i], lancedata->tx_buff[i]);
+#endif
+    }
+
+    /* Set up RX Ring */
+    for (i = 0; i < RX_RING_SIZE; i++) {
+	volatile struct RDRE *r = &lancedata->rx_ring[i];
+	r->RMD0 = swloww(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i]));
+	r->RMD1 = swhighw(ARIADNE_RAM+offsetof(struct lancedata, rx_buff[i])) |
+		  RF_OWN;
+	r->RMD2 = swapw((u_short)-PKT_BUF_SIZE);
+	r->RMD3 = 0x0000;
+	priv->rx_ring[i] = &lancedata->rx_ring[i];
+	priv->rx_buff[i] = lancedata->rx_buff[i];
+#if 0
+	printk(KERN_DEBUG "RX Entry %2d at %p, Buf at %p\n", i,
+	       &lancedata->rx_ring[i], lancedata->rx_buff[i]);
+#endif
+    }
+}
+
+
+static int ariadne_close(struct net_device *dev)
+{
+    struct ariadne_private *priv = netdev_priv(dev);
+    volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
+
+    netif_stop_queue(dev);
+
+    lance->RAP = CSR112;	/* Missed Frame Count */
+    priv->stats.rx_missed_errors = swapw(lance->RDP);
+    lance->RAP = CSR0;		/* PCnet-ISA Controller Status */
+
+    if (ariadne_debug > 1) {
+	printk(KERN_DEBUG "%s: Shutting down ethercard, status was %2.2x.\n",
+	       dev->name, lance->RDP);
+	printk(KERN_DEBUG "%s: %lu packets missed\n", dev->name,
+	       priv->stats.rx_missed_errors);
+    }
+
+    /* We stop the LANCE here -- it occasionally polls memory if we don't. */
+    lance->RDP = STOP;
+
+    free_irq(IRQ_AMIGA_PORTS, dev);
+
+    return 0;
+}
+
+
+static inline void ariadne_reset(struct net_device *dev)
+{
+    volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
+
+    lance->RAP = CSR0;	/* PCnet-ISA Controller Status */
+    lance->RDP = STOP;
+    ariadne_init_ring(dev);
+    lance->RDP = INEA|STRT;
+    netif_start_queue(dev);
+}
+
+
+static irqreturn_t ariadne_interrupt(int irq, void *data, struct pt_regs *fp)
+{
+    struct net_device *dev = (struct net_device *)data;
+    volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
+    struct ariadne_private *priv;
+    int csr0, boguscnt;
+    int handled = 0;
+
+    if (dev == NULL) {
+	printk(KERN_WARNING "ariadne_interrupt(): irq for unknown device.\n");
+	return IRQ_NONE;
+    }
+
+    lance->RAP = CSR0;			/* PCnet-ISA Controller Status */
+
+    if (!(lance->RDP & INTR))		/* Check if any interrupt has been */
+	return IRQ_NONE;		/* generated by the board. */
+
+    priv = netdev_priv(dev);
+
+    boguscnt = 10;
+    while ((csr0 = lance->RDP) & (ERR|RINT|TINT) && --boguscnt >= 0) {
+	/* Acknowledge all of the current interrupt sources ASAP. */
+	lance->RDP = csr0 & ~(INEA|TDMD|STOP|STRT|INIT);
+
+#if 0
+	if (ariadne_debug > 5) {
+	    printk(KERN_DEBUG "%s: interrupt  csr0=%#2.2x new csr=%#2.2x.",
+		   dev->name, csr0, lance->RDP);
+	    printk("[");
+	    if (csr0 & INTR)
+		printk(" INTR");
+	    if (csr0 & INEA)
+		printk(" INEA");
+	    if (csr0 & RXON)
+		printk(" RXON");
+	    if (csr0 & TXON)
+		printk(" TXON");
+	    if (csr0 & TDMD)
+		printk(" TDMD");
+	    if (csr0 & STOP)
+		printk(" STOP");
+	    if (csr0 & STRT)
+		printk(" STRT");
+	    if (csr0 & INIT)
+		printk(" INIT");
+	    if (csr0 & ERR)
+		printk(" ERR");
+	    if (csr0 & BABL)
+		printk(" BABL");
+	    if (csr0 & CERR)
+		printk(" CERR");
+	    if (csr0 & MISS)
+		printk(" MISS");
+	    if (csr0 & MERR)
+		printk(" MERR");
+	    if (csr0 & RINT)
+		printk(" RINT");
+	    if (csr0 & TINT)
+		printk(" TINT");
+	    if (csr0 & IDON)
+		printk(" IDON");
+	    printk(" ]\n");
+	}
+#endif
+
+	if (csr0 & RINT) {	/* Rx interrupt */
+	    handled = 1;
+	    ariadne_rx(dev);
+	}
+
+	if (csr0 & TINT) {	/* Tx-done interrupt */
+	    int dirty_tx = priv->dirty_tx;
+
+	    handled = 1;
+	    while (dirty_tx < priv->cur_tx) {
+		int entry = dirty_tx % TX_RING_SIZE;
+		int status = lowb(priv->tx_ring[entry]->TMD1);
+
+		if (status & TF_OWN)
+		    break;	/* It still hasn't been Txed */
+
+		priv->tx_ring[entry]->TMD1 &= 0xff00;
+
+		if (status & TF_ERR) {
+		    /* There was an major error, log it. */
+		    int err_status = priv->tx_ring[entry]->TMD3;
+		    priv->stats.tx_errors++;
+		    if (err_status & EF_RTRY)
+			priv->stats.tx_aborted_errors++;
+		    if (err_status & EF_LCAR)
+			priv->stats.tx_carrier_errors++;
+		    if (err_status & EF_LCOL)
+			priv->stats.tx_window_errors++;
+		    if (err_status & EF_UFLO) {
+			/* Ackk!  On FIFO errors the Tx unit is turned off! */
+			priv->stats.tx_fifo_errors++;
+			/* Remove this verbosity later! */
+			printk(KERN_ERR "%s: Tx FIFO error! Status %4.4x.\n",
+			       dev->name, csr0);
+			/* Restart the chip. */
+			lance->RDP = STRT;
+		    }
+		} else {
+		    if (status & (TF_MORE|TF_ONE))
+			priv->stats.collisions++;
+		    priv->stats.tx_packets++;
+		}
+		dirty_tx++;
+	    }
+
+#ifndef final_version
+	    if (priv->cur_tx - dirty_tx >= TX_RING_SIZE) {
+		printk(KERN_ERR "out-of-sync dirty pointer, %d vs. %d, "
+		       "full=%d.\n", dirty_tx, priv->cur_tx, priv->tx_full);
+		dirty_tx += TX_RING_SIZE;
+	    }
+#endif
+
+	    if (priv->tx_full && netif_queue_stopped(dev) &&
+		dirty_tx > priv->cur_tx - TX_RING_SIZE + 2) {
+		/* The ring is no longer full. */
+		priv->tx_full = 0;
+		netif_wake_queue(dev);
+	    }
+
+	    priv->dirty_tx = dirty_tx;
+	}
+
+	/* Log misc errors. */
+	if (csr0 & BABL) {
+	    handled = 1;
+	    priv->stats.tx_errors++;	/* Tx babble. */
+	}
+	if (csr0 & MISS) {
+	    handled = 1;
+	    priv->stats.rx_errors++;	/* Missed a Rx frame. */
+	}
+	if (csr0 & MERR) {
+	    handled = 1;
+	    printk(KERN_ERR "%s: Bus master arbitration failure, status "
+		   "%4.4x.\n", dev->name, csr0);
+	    /* Restart the chip. */
+	    lance->RDP = STRT;
+	}
+    }
+
+    /* Clear any other interrupt, and set interrupt enable. */
+    lance->RAP = CSR0;		/* PCnet-ISA Controller Status */
+    lance->RDP = INEA|BABL|CERR|MISS|MERR|IDON;
+
+#if 0
+    if (ariadne_debug > 4)
+	printk(KERN_DEBUG "%s: exiting interrupt, csr%d=%#4.4x.\n", dev->name,
+	       lance->RAP, lance->RDP);
+#endif
+    return IRQ_RETVAL(handled);
+}
+
+
+static void ariadne_tx_timeout(struct net_device *dev)
+{
+    volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
+
+    printk(KERN_ERR "%s: transmit timed out, status %4.4x, resetting.\n",
+	   dev->name, lance->RDP);
+    ariadne_reset(dev);
+    netif_wake_queue(dev);
+}
+
+
+static int ariadne_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+    struct ariadne_private *priv = netdev_priv(dev);
+    volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
+    int entry;
+    unsigned long flags;
+    int len = skb->len;
+
+#if 0
+    if (ariadne_debug > 3) {
+	lance->RAP = CSR0;	/* PCnet-ISA Controller Status */
+	printk(KERN_DEBUG "%s: ariadne_start_xmit() called, csr0 %4.4x.\n",
+	       dev->name, lance->RDP);
+	lance->RDP = 0x0000;
+    }
+#endif
+
+    /* FIXME: is the 79C960 new enough to do its own padding right ? */
+    if (skb->len < ETH_ZLEN)
+    {
+    	skb = skb_padto(skb, ETH_ZLEN);
+    	if (skb == NULL)
+    	    return 0;
+    	len = ETH_ZLEN;
+    }
+
+    /* Fill in a Tx ring entry */
+
+#if 0
+    printk(KERN_DEBUG "TX pkt type 0x%04x from ", ((u_short *)skb->data)[6]);
+    {
+	int i;
+	u_char *ptr = &((u_char *)skb->data)[6];
+	for (i = 0; i < 6; i++)
+	    printk("%02x", ptr[i]);
+    }
+    printk(" to ");
+    {
+	int i;
+	u_char *ptr = (u_char *)skb->data;
+	for (i = 0; i < 6; i++)
+	    printk("%02x", ptr[i]);
+    }
+    printk(" data 0x%08x len %d\n", (int)skb->data, (int)skb->len);
+#endif
+
+    local_irq_save(flags);
+
+    entry = priv->cur_tx % TX_RING_SIZE;
+
+    /* Caution: the write order is important here, set the base address with
+		the "ownership" bits last. */
+
+    priv->tx_ring[entry]->TMD2 = swapw((u_short)-skb->len);
+    priv->tx_ring[entry]->TMD3 = 0x0000;
+    memcpyw(priv->tx_buff[entry], (u_short *)skb->data, len);
+
+#if 0
+    {
+	int i, len;
+
+	len = skb->len > 64 ? 64 : skb->len;
+	len >>= 1;
+	for (i = 0; i < len; i += 8) {
+	    int j;
+	    printk(KERN_DEBUG "%04x:", i);
+	    for (j = 0; (j < 8) && ((i+j) < len); j++) {
+		if (!(j & 1))
+		    printk(" ");
+		printk("%04x", priv->tx_buff[entry][i+j]);
+	    }
+	    printk("\n");
+	}
+    }
+#endif
+
+    priv->tx_ring[entry]->TMD1 = (priv->tx_ring[entry]->TMD1&0xff00)|TF_OWN|TF_STP|TF_ENP;
+
+    dev_kfree_skb(skb);
+
+    priv->cur_tx++;
+    if ((priv->cur_tx >= TX_RING_SIZE) && (priv->dirty_tx >= TX_RING_SIZE)) {
+
+#if 0
+	printk(KERN_DEBUG "*** Subtracting TX_RING_SIZE from cur_tx (%d) and "
+	       "dirty_tx (%d)\n", priv->cur_tx, priv->dirty_tx);
+#endif
+
+	priv->cur_tx -= TX_RING_SIZE;
+	priv->dirty_tx -= TX_RING_SIZE;
+    }
+
+    /* Trigger an immediate send poll. */
+    lance->RAP = CSR0;		/* PCnet-ISA Controller Status */
+    lance->RDP = INEA|TDMD;
+
+    dev->trans_start = jiffies;
+
+    if (lowb(priv->tx_ring[(entry+1) % TX_RING_SIZE]->TMD1) != 0) {
+	netif_stop_queue(dev);
+	priv->tx_full = 1;
+    }
+    local_irq_restore(flags);
+
+    return 0;
+}
+
+
+static int ariadne_rx(struct net_device *dev)
+{
+    struct ariadne_private *priv = netdev_priv(dev);
+    int entry = priv->cur_rx % RX_RING_SIZE;
+    int i;
+
+    /* If we own the next entry, it's a new packet. Send it up. */
+    while (!(lowb(priv->rx_ring[entry]->RMD1) & RF_OWN)) {
+	int status = lowb(priv->rx_ring[entry]->RMD1);
+
+	if (status != (RF_STP|RF_ENP)) {	/* 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 & RF_ENP)
+		/* Only count a general error at the end of a packet.*/
+		priv->stats.rx_errors++;
+	    if (status & RF_FRAM)
+		priv->stats.rx_frame_errors++;
+	    if (status & RF_OFLO)
+		priv->stats.rx_over_errors++;
+	    if (status & RF_CRC)
+		priv->stats.rx_crc_errors++;
+	    if (status & RF_BUFF)
+		priv->stats.rx_fifo_errors++;
+	    priv->rx_ring[entry]->RMD1 &= 0xff00|RF_STP|RF_ENP;
+	} else {
+	    /* Malloc up new buffer, compatible with net-3. */
+	    short pkt_len = swapw(priv->rx_ring[entry]->RMD3);
+	    struct sk_buff *skb;
+
+	    skb = dev_alloc_skb(pkt_len+2);
+	    if (skb == NULL) {
+		printk(KERN_WARNING "%s: Memory squeeze, deferring packet.\n",
+		       dev->name);
+		for (i = 0; i < RX_RING_SIZE; i++)
+		    if (lowb(priv->rx_ring[(entry+i) % RX_RING_SIZE]->RMD1) & RF_OWN)
+			break;
+
+		if (i > RX_RING_SIZE-2) {
+		    priv->stats.rx_dropped++;
+		    priv->rx_ring[entry]->RMD1 |= RF_OWN;
+		    priv->cur_rx++;
+		}
+		break;
+	    }
+
+
+	    skb->dev = dev;
+	    skb_reserve(skb,2);		/* 16 byte align */
+	    skb_put(skb,pkt_len);	/* Make room */
+	    eth_copy_and_sum(skb, (char *)priv->rx_buff[entry], pkt_len,0);
+	    skb->protocol=eth_type_trans(skb,dev);
+#if 0
+	    printk(KERN_DEBUG "RX pkt type 0x%04x from ",
+		   ((u_short *)skb->data)[6]);
+	    {
+		int i;
+		u_char *ptr = &((u_char *)skb->data)[6];
+		for (i = 0; i < 6; i++)
+		    printk("%02x", ptr[i]);
+	    }
+	    printk(" to ");
+	    {
+		int i;
+		u_char *ptr = (u_char *)skb->data;
+		for (i = 0; i < 6; i++)
+		    printk("%02x", ptr[i]);
+	    }
+	    printk(" data 0x%08x len %d\n", (int)skb->data, (int)skb->len);
+#endif
+
+	    netif_rx(skb);
+	    dev->last_rx = jiffies;
+	    priv->stats.rx_packets++;
+	    priv->stats.rx_bytes += pkt_len;
+	}
+
+	priv->rx_ring[entry]->RMD1 |= RF_OWN;
+	entry = (++priv->cur_rx) % RX_RING_SIZE;
+    }
+
+    priv->cur_rx = priv->cur_rx % RX_RING_SIZE;
+
+    /* 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 struct net_device_stats *ariadne_get_stats(struct net_device *dev)
+{
+    struct ariadne_private *priv = netdev_priv(dev);
+    volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
+    short saved_addr;
+    unsigned long flags;
+
+    local_irq_save(flags);
+    saved_addr = lance->RAP;
+    lance->RAP = CSR112;		/* Missed Frame Count */
+    priv->stats.rx_missed_errors = swapw(lance->RDP);
+    lance->RAP = saved_addr;
+    local_irq_restore(flags);
+
+    return &priv->stats;
+}
+
+
+/* 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.
+ */
+static void set_multicast_list(struct net_device *dev)
+{
+    volatile struct Am79C960 *lance = (struct Am79C960*)dev->base_addr;
+
+    if (!netif_running(dev))
+	return;
+
+    netif_stop_queue(dev);
+
+    /* We take the simple way out and always enable promiscuous mode. */
+    lance->RAP = CSR0;			/* PCnet-ISA Controller Status */
+    lance->RDP = STOP;			/* Temporarily stop the lance. */
+    ariadne_init_ring(dev);
+
+    if (dev->flags & IFF_PROMISC) {
+	/* Log any net taps. */
+	printk(KERN_INFO "%s: Promiscuous mode enabled.\n", dev->name);
+	lance->RAP = CSR15;		/* Mode Register */
+	lance->RDP = PROM;		/* Set promiscuous mode */
+    } else {
+	short multicast_table[4];
+	int num_addrs = dev->mc_count;
+	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++) {
+	    lance->RAP = CSR8+(i<<8);	/* Logical Address Filter */
+	    lance->RDP = swapw(multicast_table[i]);
+	}
+	lance->RAP = CSR15;		/* Mode Register */
+	lance->RDP = 0x0000;		/* Unset promiscuous mode */
+    }
+
+    lance->RAP = CSR0;			/* PCnet-ISA Controller Status */
+    lance->RDP = INEA|STRT|IDON;	/* Resume normal operation. */
+
+    netif_wake_queue(dev);
+}
+
+
+static void __devexit ariadne_remove_one(struct zorro_dev *z)
+{
+    struct net_device *dev = zorro_get_drvdata(z);
+
+    unregister_netdev(dev);
+    release_mem_region(ZTWO_PADDR(dev->base_addr), sizeof(struct Am79C960));
+    release_mem_region(ZTWO_PADDR(dev->mem_start), ARIADNE_RAM_SIZE);
+    free_netdev(dev);
+}
+
+static int __init ariadne_init_module(void)
+{
+    return zorro_module_init(&ariadne_driver);
+}
+
+static void __exit ariadne_cleanup_module(void)
+{
+    zorro_unregister_driver(&ariadne_driver);
+}
+
+module_init(ariadne_init_module);
+module_exit(ariadne_cleanup_module);
+
+MODULE_LICENSE("GPL");