Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 791 insertions, 0 deletions

diff --git a/drivers/net/ethernet/amd/ariadne.c b/drivers/net/ethernet/amd/ariadne.c
new file mode 100644
index 000000000..4b6a5cb85
--- /dev/null
+++ b/drivers/net/ethernet/amd/ariadne.c
@@ -0,0 +1,791 @@
+/*
+ *  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
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+/*#define DEBUG*/
+
+#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/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/byteorder.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 */
+	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 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 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];
+		netdev_dbg(dev, "TX Entry %2d at %p, Buf at %p\n",
+			   i, &lancedata->tx_ring[i], lancedata->tx_buff[i]);
+	}
+
+	/* 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];
+		netdev_dbg(dev, "RX Entry %2d at %p, Buf at %p\n",
+			   i, &lancedata->rx_ring[i], lancedata->rx_buff[i]);
+	}
+}
+
+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
+			 */
+			/* Only count a general error at the end of a packet */
+			if (status & RF_ENP)
+				dev->stats.rx_errors++;
+			if (status & RF_FRAM)
+				dev->stats.rx_frame_errors++;
+			if (status & RF_OFLO)
+				dev->stats.rx_over_errors++;
+			if (status & RF_CRC)
+				dev->stats.rx_crc_errors++;
+			if (status & RF_BUFF)
+				dev->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 = netdev_alloc_skb(dev, pkt_len + 2);
+			if (skb == NULL) {
+				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) {
+					dev->stats.rx_dropped++;
+					priv->rx_ring[entry]->RMD1 |= RF_OWN;
+					priv->cur_rx++;
+				}
+				break;
+			}
+
+
+			skb_reserve(skb, 2);	/* 16 byte align */
+			skb_put(skb, pkt_len);	/* Make room */
+			skb_copy_to_linear_data(skb,
+						(const void *)priv->rx_buff[entry],
+						pkt_len);
+			skb->protocol = eth_type_trans(skb, dev);
+			netdev_dbg(dev, "RX pkt type 0x%04x from %pM to %pM data %p len %u\n",
+				   ((u_short *)skb->data)[6],
+				   skb->data + 6, skb->data,
+				   skb->data, skb->len);
+
+			netif_rx(skb);
+			dev->stats.rx_packets++;
+			dev->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 irqreturn_t ariadne_interrupt(int irq, void *data)
+{
+	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;
+
+	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);
+
+#ifdef DEBUG
+		if (ariadne_debug > 5) {
+			netdev_dbg(dev, "interrupt  csr0=%#02x new csr=%#02x [",
+				   csr0, lance->RDP);
+			if (csr0 & INTR)
+				pr_cont(" INTR");
+			if (csr0 & INEA)
+				pr_cont(" INEA");
+			if (csr0 & RXON)
+				pr_cont(" RXON");
+			if (csr0 & TXON)
+				pr_cont(" TXON");
+			if (csr0 & TDMD)
+				pr_cont(" TDMD");
+			if (csr0 & STOP)
+				pr_cont(" STOP");
+			if (csr0 & STRT)
+				pr_cont(" STRT");
+			if (csr0 & INIT)
+				pr_cont(" INIT");
+			if (csr0 & ERR)
+				pr_cont(" ERR");
+			if (csr0 & BABL)
+				pr_cont(" BABL");
+			if (csr0 & CERR)
+				pr_cont(" CERR");
+			if (csr0 & MISS)
+				pr_cont(" MISS");
+			if (csr0 & MERR)
+				pr_cont(" MERR");
+			if (csr0 & RINT)
+				pr_cont(" RINT");
+			if (csr0 & TINT)
+				pr_cont(" TINT");
+			if (csr0 & IDON)
+				pr_cont(" IDON");
+			pr_cont(" ]\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;
+					dev->stats.tx_errors++;
+					if (err_status & EF_RTRY)
+						dev->stats.tx_aborted_errors++;
+					if (err_status & EF_LCAR)
+						dev->stats.tx_carrier_errors++;
+					if (err_status & EF_LCOL)
+						dev->stats.tx_window_errors++;
+					if (err_status & EF_UFLO) {
+						/* Ackk!  On FIFO errors the Tx unit is turned off! */
+						dev->stats.tx_fifo_errors++;
+						/* Remove this verbosity later! */
+						netdev_err(dev, "Tx FIFO error! Status %04x\n",
+							   csr0);
+						/* Restart the chip */
+						lance->RDP = STRT;
+					}
+				} else {
+					if (status & (TF_MORE | TF_ONE))
+						dev->stats.collisions++;
+					dev->stats.tx_packets++;
+				}
+				dirty_tx++;
+			}
+
+#ifndef final_version
+			if (priv->cur_tx - dirty_tx >= TX_RING_SIZE) {
+				netdev_err(dev, "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;
+			dev->stats.tx_errors++;	/* Tx babble */
+		}
+		if (csr0 & MISS) {
+			handled = 1;
+			dev->stats.rx_errors++;	/* Missed a Rx frame */
+		}
+		if (csr0 & MERR) {
+			handled = 1;
+			netdev_err(dev, "Bus master arbitration failure, status %04x\n",
+				   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 (ariadne_debug > 4)
+		netdev_dbg(dev, "exiting interrupt, csr%d=%#04x\n",
+			   lance->RAP, lance->RDP);
+
+	return IRQ_RETVAL(handled);
+}
+
+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) {
+		pr_warn("Couldn't find AMD Ethernet Chip\n");
+		return -EAGAIN;
+	}
+	if ((version & 0x0ffff000) != 0x00003000) {
+		pr_warn("Couldn't find Am79C960 (Wrong part number = %ld)\n",
+		       (version & 0x0ffff000) >> 12);
+		return -EAGAIN;
+	}
+
+	netdev_dbg(dev, "Am79C960 (PCnet-ISA) Revision %ld\n",
+		   (version & 0xf0000000) >> 28);
+
+	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, IRQF_SHARED,
+			dev->name, dev);
+	if (i)
+		return i;
+
+	lance->RAP = CSR0;		/* PCnet-ISA Controller Status */
+	lance->RDP = INEA | STRT;
+
+	return 0;
+}
+
+static int ariadne_close(struct net_device *dev)
+{
+	volatile struct Am79C960 *lance = (struct Am79C960 *)dev->base_addr;
+
+	netif_stop_queue(dev);
+
+	lance->RAP = CSR112;		/* Missed Frame Count */
+	dev->stats.rx_missed_errors = swapw(lance->RDP);
+	lance->RAP = CSR0;		/* PCnet-ISA Controller Status */
+
+	if (ariadne_debug > 1) {
+		netdev_dbg(dev, "Shutting down ethercard, status was %02x\n",
+			   lance->RDP);
+		netdev_dbg(dev, "%lu packets missed\n",
+			   dev->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 void ariadne_tx_timeout(struct net_device *dev)
+{
+	volatile struct Am79C960 *lance = (struct Am79C960 *)dev->base_addr;
+
+	netdev_err(dev, "transmit timed out, status %04x, resetting\n",
+		   lance->RDP);
+	ariadne_reset(dev);
+	netif_wake_queue(dev);
+}
+
+static netdev_tx_t 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 */
+		netdev_dbg(dev, "%s: csr0 %04x\n", __func__, lance->RDP);
+		lance->RDP = 0x0000;
+	}
+#endif
+
+	/* FIXME: is the 79C960 new enough to do its own padding right ? */
+	if (skb->len < ETH_ZLEN) {
+		if (skb_padto(skb, ETH_ZLEN))
+			return NETDEV_TX_OK;
+		len = ETH_ZLEN;
+	}
+
+	/* Fill in a Tx ring entry */
+
+	netdev_dbg(dev, "TX pkt type 0x%04x from %pM to %pM data %p len %u\n",
+		   ((u_short *)skb->data)[6],
+		   skb->data + 6, skb->data,
+		   skb->data, skb->len);
+
+	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);
+
+#ifdef DEBUG
+	print_hex_dump(KERN_DEBUG, "tx_buff: ", DUMP_PREFIX_OFFSET, 16, 1,
+		       (void *)priv->tx_buff[entry],
+		       skb->len > 64 ? 64 : skb->len, true);
+#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)) {
+
+		netdev_dbg(dev, "*** Subtracting TX_RING_SIZE from cur_tx (%d) and dirty_tx (%d)\n",
+			   priv->cur_tx, priv->dirty_tx);
+
+		priv->cur_tx -= TX_RING_SIZE;
+		priv->dirty_tx -= TX_RING_SIZE;
+	}
+	dev->stats.tx_bytes += len;
+
+	/* Trigger an immediate send poll */
+	lance->RAP = CSR0;		/* PCnet-ISA Controller Status */
+	lance->RDP = INEA | TDMD;
+
+	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 NETDEV_TX_OK;
+}
+
+static struct net_device_stats *ariadne_get_stats(struct net_device *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 */
+	dev->stats.rx_missed_errors = swapw(lance->RDP);
+	lance->RAP = saved_addr;
+	local_irq_restore(flags);
+
+	return &dev->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) {
+		lance->RAP = CSR15;	/* Mode Register */
+		lance->RDP = PROM;	/* 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++) {
+			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 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 const struct zorro_device_id ariadne_zorro_tbl[] = {
+	{ ZORRO_PROD_VILLAGE_TRONIC_ARIADNE },
+	{ 0 }
+};
+MODULE_DEVICE_TABLE(zorro, ariadne_zorro_tbl);
+
+static const struct net_device_ops ariadne_netdev_ops = {
+	.ndo_open		= ariadne_open,
+	.ndo_stop		= ariadne_close,
+	.ndo_start_xmit		= ariadne_start_xmit,
+	.ndo_tx_timeout		= ariadne_tx_timeout,
+	.ndo_get_stats		= ariadne_get_stats,
+	.ndo_set_rx_mode	= set_multicast_list,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_set_mac_address	= eth_mac_addr,
+};
+
+static int 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;
+	u32 serial;
+	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_mem_region(base_addr, sizeof(struct Am79C960));
+		return -EBUSY;
+	}
+
+	dev = alloc_etherdev(sizeof(struct ariadne_private));
+	if (dev == NULL) {
+		release_mem_region(base_addr, sizeof(struct Am79C960));
+		release_mem_region(mem_start, ARIADNE_RAM_SIZE);
+		return -ENOMEM;
+	}
+
+	r1->name = dev->name;
+	r2->name = dev->name;
+
+	serial = be32_to_cpu(z->rom.er_SerialNumber);
+	dev->dev_addr[0] = 0x00;
+	dev->dev_addr[1] = 0x60;
+	dev->dev_addr[2] = 0x30;
+	dev->dev_addr[3] = (serial >> 16) & 0xff;
+	dev->dev_addr[4] = (serial >> 8) & 0xff;
+	dev->dev_addr[5] = serial & 0xff;
+	dev->base_addr = (unsigned long)ZTWO_VADDR(base_addr);
+	dev->mem_start = (unsigned long)ZTWO_VADDR(mem_start);
+	dev->mem_end = dev->mem_start + ARIADNE_RAM_SIZE;
+
+	dev->netdev_ops = &ariadne_netdev_ops;
+	dev->watchdog_timeo = 5 * HZ;
+
+	err = register_netdev(dev);
+	if (err) {
+		release_mem_region(base_addr, sizeof(struct Am79C960));
+		release_mem_region(mem_start, ARIADNE_RAM_SIZE);
+		free_netdev(dev);
+		return err;
+	}
+	zorro_set_drvdata(z, dev);
+
+	netdev_info(dev, "Ariadne at 0x%08lx, Ethernet Address %pM\n",
+		    board, dev->dev_addr);
+
+	return 0;
+}
+
+static struct zorro_driver ariadne_driver = {
+	.name		= "ariadne",
+	.id_table	= ariadne_zorro_tbl,
+	.probe		= ariadne_init_one,
+	.remove		= ariadne_remove_one,
+};
+
+static int __init ariadne_init_module(void)
+{
+	return zorro_register_driver(&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");