Adding upstream version 6.1.76.upstream/6.1.76

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

6 files changed, 2063 insertions, 0 deletions

diff --git a/drivers/net/ethernet/seeq/Kconfig b/drivers/net/ethernet/seeq/Kconfig
new file mode 100644
index 000000000..ad1df3757
--- /dev/null
+++ b/drivers/net/ethernet/seeq/Kconfig
@@ -0,0 +1,34 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# SEEQ device configuration
+#
+
+config NET_VENDOR_SEEQ
+	bool "SEEQ devices"
+	default y
+	depends on HAS_IOMEM
+	help
+	  If you have a network (Ethernet) card belonging to this class, say Y.
+
+	  Note that the answer to this question doesn't directly affect the
+	  kernel: saying N will just cause the configurator to skip all
+	  the questions about SEEQ devices. If you say Y, you will be asked for
+	  your specific card in the following questions.
+
+if NET_VENDOR_SEEQ
+
+config ARM_ETHER3
+	tristate "Acorn/ANT Ether3 support"
+	depends on ARM && ARCH_ACORN
+	help
+	  If you have an Acorn system with one of these network cards, you
+	  should say Y to this option if you wish to use it with Linux.
+
+config SGISEEQ
+	tristate "SGI Seeq ethernet controller support"
+	depends on SGI_HAS_SEEQ
+	help
+	  Say Y here if you have an Seeq based Ethernet network card. This is
+	  used in many Silicon Graphics machines.
+
+endif # NET_VENDOR_SEEQ
diff --git a/drivers/net/ethernet/seeq/Makefile b/drivers/net/ethernet/seeq/Makefile
new file mode 100644
index 000000000..02aad7869
--- /dev/null
+++ b/drivers/net/ethernet/seeq/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the SEEQ network device drivers
+#
+
+obj-$(CONFIG_ARM_ETHER3) += ether3.o
+obj-$(CONFIG_SGISEEQ) += sgiseeq.o
diff --git a/drivers/net/ethernet/seeq/ether3.c b/drivers/net/ethernet/seeq/ether3.c
new file mode 100644
index 000000000..c672f92d6
--- /dev/null
+++ b/drivers/net/ethernet/seeq/ether3.c
@@ -0,0 +1,896 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  linux/drivers/acorn/net/ether3.c
+ *
+ *  Copyright (C) 1995-2000 Russell King
+ *
+ * SEEQ nq8005 ethernet driver for Acorn/ANT Ether3 card
+ *  for Acorn machines
+ *
+ * By Russell King, with some suggestions from borris@ant.co.uk
+ *
+ * Changelog:
+ * 1.04	RMK	29/02/1996	Won't pass packets that are from our ethernet
+ *				address up to the higher levels - they're
+ *				silently ignored.  I/F can now be put into
+ *				multicast mode.  Receiver routine optimised.
+ * 1.05	RMK	30/02/1996	Now claims interrupt at open when part of
+ *				the kernel rather than when a module.
+ * 1.06	RMK	02/03/1996	Various code cleanups
+ * 1.07	RMK	13/10/1996	Optimised interrupt routine and transmit
+ *				routines.
+ * 1.08	RMK	14/10/1996	Fixed problem with too many packets,
+ *				prevented the kernel message about dropped
+ *				packets appearing too many times a second.
+ *				Now does not disable all IRQs, only the IRQ
+ *				used by this card.
+ * 1.09	RMK	10/11/1996	Only enables TX irq when buffer space is low,
+ *				but we still service the TX queue if we get a
+ *				RX interrupt.
+ * 1.10	RMK	15/07/1997	Fixed autoprobing of NQ8004.
+ * 1.11	RMK	16/11/1997	Fixed autoprobing of NQ8005A.
+ * 1.12	RMK	31/12/1997	Removed reference to dev_tint for Linux 2.1.
+ *      RMK	27/06/1998	Changed asm/delay.h to linux/delay.h.
+ * 1.13	RMK	29/06/1998	Fixed problem with transmission of packets.
+ *				Chip seems to have a bug in, whereby if the
+ *				packet starts two bytes from the end of the
+ *				buffer, it corrupts the receiver chain, and
+ *				never updates the transmit status correctly.
+ * 1.14	RMK	07/01/1998	Added initial code for ETHERB addressing.
+ * 1.15	RMK	30/04/1999	More fixes to the transmit routine for buggy
+ *				hardware.
+ * 1.16	RMK	10/02/2000	Updated for 2.3.43
+ * 1.17	RMK	13/05/2000	Updated for 2.3.99-pre8
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/bitops.h>
+
+#include <asm/ecard.h>
+#include <asm/io.h>
+
+static char version[] = "ether3 ethernet driver (c) 1995-2000 R.M.King v1.17\n";
+
+#include "ether3.h"
+
+static unsigned int net_debug = NET_DEBUG;
+
+static void	ether3_setmulticastlist(struct net_device *dev);
+static int	ether3_rx(struct net_device *dev, unsigned int maxcnt);
+static void	ether3_tx(struct net_device *dev);
+static int	ether3_open (struct net_device *dev);
+static netdev_tx_t	ether3_sendpacket(struct sk_buff *skb,
+					  struct net_device *dev);
+static irqreturn_t ether3_interrupt (int irq, void *dev_id);
+static int	ether3_close (struct net_device *dev);
+static void	ether3_setmulticastlist (struct net_device *dev);
+static void	ether3_timeout(struct net_device *dev, unsigned int txqueue);
+
+#define BUS_16		2
+#define BUS_8		1
+#define BUS_UNKNOWN	0
+
+/* --------------------------------------------------------------------------- */
+
+typedef enum {
+	buffer_write,
+	buffer_read
+} buffer_rw_t;
+
+/*
+ * ether3 read/write.  Slow things down a bit...
+ * The SEEQ8005 doesn't like us writing to its registers
+ * too quickly.
+ */
+static inline void ether3_outb(int v, void __iomem *r)
+{
+	writeb(v, r);
+	udelay(1);
+}
+
+static inline void ether3_outw(int v, void __iomem *r)
+{
+	writew(v, r);
+	udelay(1);
+}
+#define ether3_inb(r)		({ unsigned int __v = readb((r)); udelay(1); __v; })
+#define ether3_inw(r)		({ unsigned int __v = readw((r)); udelay(1); __v; })
+
+static int
+ether3_setbuffer(struct net_device *dev, buffer_rw_t read, int start)
+{
+	int timeout = 1000;
+
+	ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
+	ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
+
+	while ((ether3_inw(REG_STATUS) & STAT_FIFOEMPTY) == 0) {
+		if (!timeout--) {
+			printk("%s: setbuffer broken\n", dev->name);
+			priv(dev)->broken = 1;
+			return 1;
+		}
+		udelay(1);
+	}
+
+	if (read == buffer_read) {
+		ether3_outw(start, REG_DMAADDR);
+		ether3_outw(priv(dev)->regs.command | CMD_FIFOREAD, REG_COMMAND);
+	} else {
+		ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
+		ether3_outw(start, REG_DMAADDR);
+	}
+	return 0;
+}
+
+/*
+ * write data to the buffer memory
+ */
+#define ether3_writebuffer(dev,data,length)			\
+	writesw(REG_BUFWIN, (data), (length) >> 1)
+
+#define ether3_writeword(dev,data)				\
+	writew((data), REG_BUFWIN)
+
+#define ether3_writelong(dev,data)	{			\
+	void __iomem *reg_bufwin = REG_BUFWIN;			\
+	writew((data), reg_bufwin);				\
+	writew((data) >> 16, reg_bufwin);			\
+}
+
+/*
+ * read data from the buffer memory
+ */
+#define ether3_readbuffer(dev,data,length)			\
+	readsw(REG_BUFWIN, (data), (length) >> 1)
+
+#define ether3_readword(dev)					\
+	readw(REG_BUFWIN)
+
+#define ether3_readlong(dev)	 				\
+	readw(REG_BUFWIN) | (readw(REG_BUFWIN) << 16)
+
+/*
+ * Switch LED off...
+ */
+static void ether3_ledoff(struct timer_list *t)
+{
+	struct dev_priv *private = from_timer(private, t, timer);
+	struct net_device *dev = private->dev;
+
+	ether3_outw(priv(dev)->regs.config2 |= CFG2_CTRLO, REG_CONFIG2);
+}
+
+/*
+ * switch LED on...
+ */
+static inline void ether3_ledon(struct net_device *dev)
+{
+	del_timer(&priv(dev)->timer);
+	priv(dev)->timer.expires = jiffies + HZ / 50; /* leave on for 1/50th second */
+	add_timer(&priv(dev)->timer);
+	if (priv(dev)->regs.config2 & CFG2_CTRLO)
+		ether3_outw(priv(dev)->regs.config2 &= ~CFG2_CTRLO, REG_CONFIG2);
+}
+
+/*
+ * Read the ethernet address string from the on board rom.
+ * This is an ascii string!!!
+ */
+static int
+ether3_addr(char *addr, struct expansion_card *ec)
+{
+	struct in_chunk_dir cd;
+	char *s;
+	
+	if (ecard_readchunk(&cd, ec, 0xf5, 0) && (s = strchr(cd.d.string, '('))) {
+		int i;
+		for (i = 0; i<6; i++) {
+			addr[i] = simple_strtoul(s + 1, &s, 0x10);
+			if (*s != (i==5?')' : ':' ))
+				break;
+		}
+		if (i == 6)
+			return 0;
+	}
+	/* I wonder if we should even let the user continue in this case
+	 *   - no, it would be better to disable the device
+	 */
+	printk(KERN_ERR "ether3: Couldn't read a valid MAC address from card.\n");
+	return -ENODEV;
+}
+
+/* --------------------------------------------------------------------------- */
+
+static int
+ether3_ramtest(struct net_device *dev, unsigned char byte)
+{
+	unsigned char *buffer = kmalloc(RX_END, GFP_KERNEL);
+	int i,ret = 0;
+	int max_errors = 4;
+	int bad = -1;
+
+	if (!buffer)
+		return 1;
+
+	memset(buffer, byte, RX_END);
+	ether3_setbuffer(dev, buffer_write, 0);
+	ether3_writebuffer(dev, buffer, TX_END);
+	ether3_setbuffer(dev, buffer_write, RX_START);
+	ether3_writebuffer(dev, buffer + RX_START, RX_LEN);
+	memset(buffer, byte ^ 0xff, RX_END);
+	ether3_setbuffer(dev, buffer_read, 0);
+	ether3_readbuffer(dev, buffer, TX_END);
+	ether3_setbuffer(dev, buffer_read, RX_START);
+	ether3_readbuffer(dev, buffer + RX_START, RX_LEN);
+
+	for (i = 0; i < RX_END; i++) {
+		if (buffer[i] != byte) {
+			if (max_errors > 0 && bad != buffer[i]) {
+				printk("%s: RAM failed with (%02X instead of %02X) at 0x%04X",
+				       dev->name, buffer[i], byte, i);
+				ret = 2;
+				max_errors--;
+				bad = i;
+			}
+		} else {
+			if (bad != -1) {
+				if (bad != i - 1)
+					printk(" - 0x%04X\n", i - 1);
+				printk("\n");
+				bad = -1;
+			}
+		}
+	}
+	if (bad != -1)
+		printk(" - 0xffff\n");
+	kfree(buffer);
+
+	return ret;
+}
+
+/* ------------------------------------------------------------------------------- */
+
+static int ether3_init_2(struct net_device *dev)
+{
+	int i;
+
+	priv(dev)->regs.config1 = CFG1_RECVCOMPSTAT0|CFG1_DMABURST8;
+	priv(dev)->regs.config2 = CFG2_CTRLO|CFG2_RECVCRC|CFG2_ERRENCRC;
+	priv(dev)->regs.command = 0;
+
+	/*
+	 * Set up our hardware address
+	 */
+	ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
+	for (i = 0; i < 6; i++)
+		ether3_outb(dev->dev_addr[i], REG_BUFWIN);
+
+	if (dev->flags & IFF_PROMISC)
+		priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
+	else if (dev->flags & IFF_MULTICAST)
+		priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
+	else
+		priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
+
+	/*
+	 * There is a problem with the NQ8005 in that it occasionally loses the
+	 * last two bytes.  To get round this problem, we receive the CRC as
+	 * well.  That way, if we do lose the last two, then it doesn't matter.
+	 */
+	ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
+	ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
+	ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
+	ether3_outw(0, REG_TRANSMITPTR);
+	ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
+	ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
+	ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
+	ether3_outw(priv(dev)->regs.command, REG_COMMAND);
+
+	i = ether3_ramtest(dev, 0x5A);
+	if(i)
+		return i;
+	i = ether3_ramtest(dev, 0x1E);
+	if(i)
+		return i;
+
+	ether3_setbuffer(dev, buffer_write, 0);
+	ether3_writelong(dev, 0);
+	return 0;
+}
+
+static void
+ether3_init_for_open(struct net_device *dev)
+{
+	int i;
+
+	/* Reset the chip */
+	ether3_outw(CFG2_RESET, REG_CONFIG2);
+	udelay(4);
+
+	priv(dev)->regs.command = 0;
+	ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
+	while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
+		barrier();
+
+	ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
+	for (i = 0; i < 6; i++)
+		ether3_outb(dev->dev_addr[i], REG_BUFWIN);
+
+	priv(dev)->tx_head	= 0;
+	priv(dev)->tx_tail	= 0;
+	priv(dev)->regs.config2 |= CFG2_CTRLO;
+	priv(dev)->rx_head	= RX_START;
+
+	ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
+	ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
+	ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
+	ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
+	ether3_outw(0, REG_TRANSMITPTR);
+	ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
+	ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
+
+	ether3_setbuffer(dev, buffer_write, 0);
+	ether3_writelong(dev, 0);
+
+	priv(dev)->regs.command = CMD_ENINTRX | CMD_ENINTTX;
+	ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
+}
+
+static inline int
+ether3_probe_bus_8(struct net_device *dev, int val)
+{
+	int write_low, write_high, read_low, read_high;
+
+	write_low = val & 255;
+	write_high = val >> 8;
+
+	printk(KERN_DEBUG "ether3_probe: write8 [%02X:%02X]", write_high, write_low);
+
+	ether3_outb(write_low, REG_RECVPTR);
+	ether3_outb(write_high, REG_RECVPTR + 4);
+
+	read_low = ether3_inb(REG_RECVPTR);
+	read_high = ether3_inb(REG_RECVPTR + 4);
+
+	printk(", read8 [%02X:%02X]\n", read_high, read_low);
+
+	return read_low == write_low && read_high == write_high;
+}
+
+static inline int
+ether3_probe_bus_16(struct net_device *dev, int val)
+{
+	int read_val;
+
+	ether3_outw(val, REG_RECVPTR);
+	read_val = ether3_inw(REG_RECVPTR);
+
+	printk(KERN_DEBUG "ether3_probe: write16 [%04X], read16 [%04X]\n", val, read_val);
+
+	return read_val == val;
+}
+
+/*
+ * Open/initialize the board.  This is called (in the current kernel)
+ * sometime after booting when the 'ifconfig' program is run.
+ *
+ * This routine should set everything up anew at each open, even
+ * registers that "should" only need to be set once at boot, so that
+ * there is non-reboot way to recover if something goes wrong.
+ */
+static int
+ether3_open(struct net_device *dev)
+{
+	if (request_irq(dev->irq, ether3_interrupt, 0, "ether3", dev))
+		return -EAGAIN;
+
+	ether3_init_for_open(dev);
+
+	netif_start_queue(dev);
+
+	return 0;
+}
+
+/*
+ * The inverse routine to ether3_open().
+ */
+static int
+ether3_close(struct net_device *dev)
+{
+	netif_stop_queue(dev);
+
+	disable_irq(dev->irq);
+
+	ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
+	priv(dev)->regs.command = 0;
+	while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
+		barrier();
+	ether3_outb(0x80, REG_CONFIG2 + 4);
+	ether3_outw(0, REG_COMMAND);
+
+	free_irq(dev->irq, dev);
+
+	return 0;
+}
+
+/*
+ * Set or clear promiscuous/multicast mode filter for this adaptor.
+ *
+ * We don't attempt any packet filtering.  The card may have a SEEQ 8004
+ * in which does not have the other ethernet address registers present...
+ */
+static void ether3_setmulticastlist(struct net_device *dev)
+{
+	priv(dev)->regs.config1 &= ~CFG1_RECVPROMISC;
+
+	if (dev->flags & IFF_PROMISC) {
+		/* promiscuous mode */
+		priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
+	} else if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev)) {
+		priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
+	} else
+		priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;
+
+	ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
+}
+
+static void ether3_timeout(struct net_device *dev, unsigned int txqueue)
+{
+	unsigned long flags;
+
+	del_timer(&priv(dev)->timer);
+
+	local_irq_save(flags);
+	printk(KERN_ERR "%s: transmit timed out, network cable problem?\n", dev->name);
+	printk(KERN_ERR "%s: state: { status=%04X cfg1=%04X cfg2=%04X }\n", dev->name,
+		ether3_inw(REG_STATUS), ether3_inw(REG_CONFIG1), ether3_inw(REG_CONFIG2));
+	printk(KERN_ERR "%s: { rpr=%04X rea=%04X tpr=%04X }\n", dev->name,
+		ether3_inw(REG_RECVPTR), ether3_inw(REG_RECVEND), ether3_inw(REG_TRANSMITPTR));
+	printk(KERN_ERR "%s: tx head=%X tx tail=%X\n", dev->name,
+		priv(dev)->tx_head, priv(dev)->tx_tail);
+	ether3_setbuffer(dev, buffer_read, priv(dev)->tx_tail);
+	printk(KERN_ERR "%s: packet status = %08X\n", dev->name, ether3_readlong(dev));
+	local_irq_restore(flags);
+
+	priv(dev)->regs.config2 |= CFG2_CTRLO;
+	dev->stats.tx_errors += 1;
+	ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
+	priv(dev)->tx_head = priv(dev)->tx_tail = 0;
+
+	netif_wake_queue(dev);
+}
+
+/*
+ * Transmit a packet
+ */
+static netdev_tx_t
+ether3_sendpacket(struct sk_buff *skb, struct net_device *dev)
+{
+	unsigned long flags;
+	unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
+	unsigned int ptr, next_ptr;
+
+	if (priv(dev)->broken) {
+		dev_kfree_skb(skb);
+		dev->stats.tx_dropped++;
+		netif_start_queue(dev);
+		return NETDEV_TX_OK;
+	}
+
+	length = (length + 1) & ~1;
+	if (length != skb->len) {
+		if (skb_padto(skb, length))
+			goto out;
+	}
+
+	next_ptr = (priv(dev)->tx_head + 1) & 15;
+
+	local_irq_save(flags);
+
+	if (priv(dev)->tx_tail == next_ptr) {
+		local_irq_restore(flags);
+		return NETDEV_TX_BUSY;	/* unable to queue */
+	}
+
+	ptr		 = 0x600 * priv(dev)->tx_head;
+	priv(dev)->tx_head = next_ptr;
+	next_ptr	*= 0x600;
+
+#define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)
+
+	ether3_setbuffer(dev, buffer_write, next_ptr);
+	ether3_writelong(dev, 0);
+	ether3_setbuffer(dev, buffer_write, ptr);
+	ether3_writelong(dev, 0);
+	ether3_writebuffer(dev, skb->data, length);
+	ether3_writeword(dev, htons(next_ptr));
+	ether3_writeword(dev, TXHDR_CHAINCONTINUE >> 16);
+	ether3_setbuffer(dev, buffer_write, ptr);
+	ether3_writeword(dev, htons((ptr + length + 4)));
+	ether3_writeword(dev, TXHDR_FLAGS >> 16);
+	ether3_ledon(dev);
+
+	if (!(ether3_inw(REG_STATUS) & STAT_TXON)) {
+		ether3_outw(ptr, REG_TRANSMITPTR);
+		ether3_outw(priv(dev)->regs.command | CMD_TXON, REG_COMMAND);
+	}
+
+	next_ptr = (priv(dev)->tx_head + 1) & 15;
+	local_irq_restore(flags);
+
+	dev_kfree_skb(skb);
+
+	if (priv(dev)->tx_tail == next_ptr)
+		netif_stop_queue(dev);
+
+ out:
+	return NETDEV_TX_OK;
+}
+
+static irqreturn_t
+ether3_interrupt(int irq, void *dev_id)
+{
+	struct net_device *dev = (struct net_device *)dev_id;
+	unsigned int status, handled = IRQ_NONE;
+
+#if NET_DEBUG > 1
+	if(net_debug & DEBUG_INT)
+		printk("eth3irq: %d ", irq);
+#endif
+
+	status = ether3_inw(REG_STATUS);
+
+	if (status & STAT_INTRX) {
+		ether3_outw(CMD_ACKINTRX | priv(dev)->regs.command, REG_COMMAND);
+		ether3_rx(dev, 12);
+		handled = IRQ_HANDLED;
+	}
+
+	if (status & STAT_INTTX) {
+		ether3_outw(CMD_ACKINTTX | priv(dev)->regs.command, REG_COMMAND);
+		ether3_tx(dev);
+		handled = IRQ_HANDLED;
+	}
+
+#if NET_DEBUG > 1
+	if(net_debug & DEBUG_INT)
+		printk("done\n");
+#endif
+	return handled;
+}
+
+/*
+ * If we have a good packet(s), get it/them out of the buffers.
+ */
+static int ether3_rx(struct net_device *dev, unsigned int maxcnt)
+{
+	unsigned int next_ptr = priv(dev)->rx_head, received = 0;
+
+	ether3_ledon(dev);
+
+	do {
+		unsigned int this_ptr, status;
+		unsigned char addrs[16];
+
+		/*
+		 * read the first 16 bytes from the buffer.
+		 * This contains the status bytes etc and ethernet addresses,
+		 * and we also check the source ethernet address to see if
+		 * it originated from us.
+		 */
+		{
+			unsigned int temp_ptr;
+			ether3_setbuffer(dev, buffer_read, next_ptr);
+			temp_ptr = ether3_readword(dev);
+			status = ether3_readword(dev);
+			if ((status & (RXSTAT_DONE | RXHDR_CHAINCONTINUE | RXHDR_RECEIVE)) !=
+				(RXSTAT_DONE | RXHDR_CHAINCONTINUE) || !temp_ptr)
+				break;
+
+			this_ptr = next_ptr + 4;
+			next_ptr = ntohs(temp_ptr);
+		}
+		ether3_setbuffer(dev, buffer_read, this_ptr);
+		ether3_readbuffer(dev, addrs+2, 12);
+
+if (next_ptr < RX_START || next_ptr >= RX_END) {
+ printk("%s: bad next pointer @%04X: ", dev->name, priv(dev)->rx_head);
+ printk("%02X %02X %02X %02X ", next_ptr >> 8, next_ptr & 255, status & 255, status >> 8);
+ printk("%pM %pM\n", addrs + 2, addrs + 8);
+ next_ptr = priv(dev)->rx_head;
+ break;
+}
+		/*
+		 * ignore our own packets...
+	 	 */
+		if (!(*(unsigned long *)&dev->dev_addr[0] ^ *(unsigned long *)&addrs[2+6]) &&
+		    !(*(unsigned short *)&dev->dev_addr[4] ^ *(unsigned short *)&addrs[2+10])) {
+			maxcnt ++; /* compensate for loopedback packet */
+			ether3_outw(next_ptr >> 8, REG_RECVEND);
+		} else
+		if (!(status & (RXSTAT_OVERSIZE|RXSTAT_CRCERROR|RXSTAT_DRIBBLEERROR|RXSTAT_SHORTPACKET))) {
+			unsigned int length = next_ptr - this_ptr;
+			struct sk_buff *skb;
+
+			if (next_ptr <= this_ptr)
+				length += RX_END - RX_START;
+
+			skb = netdev_alloc_skb(dev, length + 2);
+			if (skb) {
+				unsigned char *buf;
+
+				skb_reserve(skb, 2);
+				buf = skb_put(skb, length);
+				ether3_readbuffer(dev, buf + 12, length - 12);
+				ether3_outw(next_ptr >> 8, REG_RECVEND);
+				*(unsigned short *)(buf + 0)	= *(unsigned short *)(addrs + 2);
+				*(unsigned long *)(buf + 2)	= *(unsigned long *)(addrs + 4);
+				*(unsigned long *)(buf + 6)	= *(unsigned long *)(addrs + 8);
+				*(unsigned short *)(buf + 10)	= *(unsigned short *)(addrs + 12);
+				skb->protocol = eth_type_trans(skb, dev);
+				netif_rx(skb);
+				received ++;
+			} else {
+				ether3_outw(next_ptr >> 8, REG_RECVEND);
+				dev->stats.rx_dropped++;
+				goto done;
+			}
+		} else {
+			struct net_device_stats *stats = &dev->stats;
+			ether3_outw(next_ptr >> 8, REG_RECVEND);
+			if (status & RXSTAT_OVERSIZE)	  stats->rx_over_errors ++;
+			if (status & RXSTAT_CRCERROR)	  stats->rx_crc_errors ++;
+			if (status & RXSTAT_DRIBBLEERROR) stats->rx_fifo_errors ++;
+			if (status & RXSTAT_SHORTPACKET)  stats->rx_length_errors ++;
+			stats->rx_errors++;
+		}
+	}
+	while (-- maxcnt);
+
+done:
+	dev->stats.rx_packets += received;
+	priv(dev)->rx_head = next_ptr;
+	/*
+	 * If rx went off line, then that means that the buffer may be full.  We
+	 * have dropped at least one packet.
+	 */
+	if (!(ether3_inw(REG_STATUS) & STAT_RXON)) {
+		dev->stats.rx_dropped++;
+		ether3_outw(next_ptr, REG_RECVPTR);
+		ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
+	}
+
+	return maxcnt;
+}
+
+/*
+ * Update stats for the transmitted packet(s)
+ */
+static void ether3_tx(struct net_device *dev)
+{
+	unsigned int tx_tail = priv(dev)->tx_tail;
+	int max_work = 14;
+
+	do {
+	    	unsigned long status;
+
+		/*
+	    	 * Read the packet header
+		 */
+	    	ether3_setbuffer(dev, buffer_read, tx_tail * 0x600);
+		status = ether3_readlong(dev);
+
+		/*
+		 * Check to see if this packet has been transmitted
+		 */
+		if ((status & (TXSTAT_DONE | TXHDR_TRANSMIT)) !=
+		    (TXSTAT_DONE | TXHDR_TRANSMIT))
+			break;
+
+		/*
+		 * Update errors
+		 */
+		if (!(status & (TXSTAT_BABBLED | TXSTAT_16COLLISIONS)))
+			dev->stats.tx_packets++;
+		else {
+			dev->stats.tx_errors++;
+			if (status & TXSTAT_16COLLISIONS)
+				dev->stats.collisions += 16;
+			if (status & TXSTAT_BABBLED)
+				dev->stats.tx_fifo_errors++;
+		}
+
+		tx_tail = (tx_tail + 1) & 15;
+	} while (--max_work);
+
+	if (priv(dev)->tx_tail != tx_tail) {
+		priv(dev)->tx_tail = tx_tail;
+		netif_wake_queue(dev);
+	}
+}
+
+static void ether3_banner(void)
+{
+	static unsigned version_printed = 0;
+
+	if (net_debug && version_printed++ == 0)
+		printk(KERN_INFO "%s", version);
+}
+
+static const struct net_device_ops ether3_netdev_ops = {
+	.ndo_open		= ether3_open,
+	.ndo_stop		= ether3_close,
+	.ndo_start_xmit		= ether3_sendpacket,
+	.ndo_set_rx_mode	= ether3_setmulticastlist,
+	.ndo_tx_timeout		= ether3_timeout,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_set_mac_address	= eth_mac_addr,
+};
+
+static int
+ether3_probe(struct expansion_card *ec, const struct ecard_id *id)
+{
+	const struct ether3_data *data = id->data;
+	struct net_device *dev;
+	int bus_type, ret;
+	u8 addr[ETH_ALEN];
+
+	ether3_banner();
+
+	ret = ecard_request_resources(ec);
+	if (ret)
+		goto out;
+
+	dev = alloc_etherdev(sizeof(struct dev_priv));
+	if (!dev) {
+		ret = -ENOMEM;
+		goto release;
+	}
+
+	SET_NETDEV_DEV(dev, &ec->dev);
+
+	priv(dev)->base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
+	if (!priv(dev)->base) {
+		ret = -ENOMEM;
+		goto free;
+	}
+
+	ec->irqaddr = priv(dev)->base + data->base_offset;
+	ec->irqmask = 0xf0;
+
+	priv(dev)->seeq = priv(dev)->base + data->base_offset;
+	dev->irq = ec->irq;
+
+	ether3_addr(addr, ec);
+	eth_hw_addr_set(dev, addr);
+
+	priv(dev)->dev = dev;
+	timer_setup(&priv(dev)->timer, ether3_ledoff, 0);
+
+	/* Reset card...
+	 */
+	ether3_outb(0x80, REG_CONFIG2 + 4);
+	bus_type = BUS_UNKNOWN;
+	udelay(4);
+
+	/* Test using Receive Pointer (16-bit register) to find out
+	 * how the ether3 is connected to the bus...
+	 */
+	if (ether3_probe_bus_8(dev, 0x100) &&
+	    ether3_probe_bus_8(dev, 0x201))
+		bus_type = BUS_8;
+
+	if (bus_type == BUS_UNKNOWN &&
+	    ether3_probe_bus_16(dev, 0x101) &&
+	    ether3_probe_bus_16(dev, 0x201))
+		bus_type = BUS_16;
+
+	switch (bus_type) {
+	case BUS_UNKNOWN:
+		printk(KERN_ERR "%s: unable to identify bus width\n", dev->name);
+		ret = -ENODEV;
+		goto free;
+
+	case BUS_8:
+		printk(KERN_ERR "%s: %s found, but is an unsupported "
+			"8-bit card\n", dev->name, data->name);
+		ret = -ENODEV;
+		goto free;
+
+	default:
+		break;
+	}
+
+	if (ether3_init_2(dev)) {
+		ret = -ENODEV;
+		goto free;
+	}
+
+	dev->netdev_ops		= &ether3_netdev_ops;
+	dev->watchdog_timeo	= 5 * HZ / 100;
+
+	ret = register_netdev(dev);
+	if (ret)
+		goto free;
+
+	printk("%s: %s in slot %d, %pM\n",
+	       dev->name, data->name, ec->slot_no, dev->dev_addr);
+
+	ecard_set_drvdata(ec, dev);
+	return 0;
+
+ free:
+	free_netdev(dev);
+ release:
+	ecard_release_resources(ec);
+ out:
+	return ret;
+}
+
+static void ether3_remove(struct expansion_card *ec)
+{
+	struct net_device *dev = ecard_get_drvdata(ec);
+
+	ecard_set_drvdata(ec, NULL);
+
+	unregister_netdev(dev);
+	free_netdev(dev);
+	ecard_release_resources(ec);
+}
+
+static struct ether3_data ether3 = {
+	.name		= "ether3",
+	.base_offset	= 0,
+};
+
+static struct ether3_data etherb = {
+	.name		= "etherb",
+	.base_offset	= 0x800,
+};
+
+static const struct ecard_id ether3_ids[] = {
+	{ MANU_ANT2, PROD_ANT_ETHER3, &ether3 },
+	{ MANU_ANT,  PROD_ANT_ETHER3, &ether3 },
+	{ MANU_ANT,  PROD_ANT_ETHERB, &etherb },
+	{ 0xffff, 0xffff }
+};
+
+static struct ecard_driver ether3_driver = {
+	.probe		= ether3_probe,
+	.remove		= ether3_remove,
+	.id_table	= ether3_ids,
+	.drv = {
+		.name	= "ether3",
+	},
+};
+
+static int __init ether3_init(void)
+{
+	return ecard_register_driver(&ether3_driver);
+}
+
+static void __exit ether3_exit(void)
+{
+	ecard_remove_driver(&ether3_driver);
+}
+
+module_init(ether3_init);
+module_exit(ether3_exit);
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/net/ethernet/seeq/ether3.h b/drivers/net/ethernet/seeq/ether3.h
new file mode 100644
index 000000000..585dd51be
--- /dev/null
+++ b/drivers/net/ethernet/seeq/ether3.h
@@ -0,0 +1,174 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ *  linux/drivers/acorn/net/ether3.h
+ *
+ *  Copyright (C) 1995-2000 Russell King
+ *
+ *  network driver for Acorn/ANT Ether3 cards
+ */
+
+#ifndef _LINUX_ether3_H
+#define _LINUX_ether3_H
+
+/* use 0 for production, 1 for verification, >2 for debug. debug flags: */
+#define DEBUG_TX	 2
+#define DEBUG_RX	 4
+#define DEBUG_INT	 8
+#define DEBUG_IC	16
+#ifndef NET_DEBUG
+#define NET_DEBUG 	0
+#endif
+
+#define priv(dev)	((struct dev_priv *)netdev_priv(dev))
+
+/* Command register definitions & bits */
+#define REG_COMMAND		(priv(dev)->seeq + 0x0000)
+#define CMD_ENINTDMA		0x0001
+#define CMD_ENINTRX		0x0002
+#define CMD_ENINTTX		0x0004
+#define CMD_ENINTBUFWIN		0x0008
+#define CMD_ACKINTDMA		0x0010
+#define CMD_ACKINTRX		0x0020
+#define CMD_ACKINTTX		0x0040
+#define CMD_ACKINTBUFWIN	0x0080
+#define CMD_DMAON		0x0100
+#define CMD_RXON		0x0200
+#define CMD_TXON		0x0400
+#define CMD_DMAOFF		0x0800
+#define CMD_RXOFF		0x1000
+#define CMD_TXOFF		0x2000
+#define CMD_FIFOREAD		0x4000
+#define CMD_FIFOWRITE		0x8000
+
+/* status register */
+#define REG_STATUS		(priv(dev)->seeq + 0x0000)
+#define STAT_ENINTSTAT		0x0001
+#define STAT_ENINTRX		0x0002
+#define STAT_ENINTTX		0x0004
+#define STAT_ENINTBUFWIN	0x0008
+#define STAT_INTDMA		0x0010
+#define STAT_INTRX		0x0020
+#define STAT_INTTX		0x0040
+#define STAT_INTBUFWIN		0x0080
+#define STAT_DMAON		0x0100
+#define STAT_RXON		0x0200
+#define STAT_TXON		0x0400
+#define STAT_FIFOFULL		0x2000
+#define STAT_FIFOEMPTY		0x4000
+#define STAT_FIFODIR		0x8000
+
+/* configuration register 1 */
+#define REG_CONFIG1		(priv(dev)->seeq + 0x0040)
+#define CFG1_BUFSELSTAT0	0x0000
+#define CFG1_BUFSELSTAT1	0x0001
+#define CFG1_BUFSELSTAT2	0x0002
+#define CFG1_BUFSELSTAT3	0x0003
+#define CFG1_BUFSELSTAT4	0x0004
+#define CFG1_BUFSELSTAT5	0x0005
+#define CFG1_ADDRPROM		0x0006
+#define CFG1_TRANSEND		0x0007
+#define CFG1_LOCBUFMEM		0x0008
+#define CFG1_INTVECTOR		0x0009
+#define CFG1_RECVSPECONLY	0x0000
+#define CFG1_RECVSPECBROAD	0x4000
+#define CFG1_RECVSPECBRMULTI	0x8000
+#define CFG1_RECVPROMISC	0xC000
+
+/* The following aren't in 8004 */
+#define CFG1_DMABURSTCONT	0x0000
+#define CFG1_DMABURST800NS	0x0010
+#define CFG1_DMABURST1600NS	0x0020
+#define CFG1_DMABURST3200NS	0x0030
+#define CFG1_DMABURST1		0x0000
+#define CFG1_DMABURST4		0x0040
+#define CFG1_DMABURST8		0x0080
+#define CFG1_DMABURST16		0x00C0
+#define CFG1_RECVCOMPSTAT0	0x0100
+#define CFG1_RECVCOMPSTAT1	0x0200
+#define CFG1_RECVCOMPSTAT2	0x0400
+#define CFG1_RECVCOMPSTAT3	0x0800
+#define CFG1_RECVCOMPSTAT4	0x1000
+#define CFG1_RECVCOMPSTAT5	0x2000
+
+/* configuration register 2 */
+#define REG_CONFIG2		(priv(dev)->seeq + 0x0080)
+#define CFG2_BYTESWAP		0x0001
+#define CFG2_ERRENCRC		0x0008
+#define CFG2_ERRENDRIBBLE	0x0010
+#define CFG2_ERRSHORTFRAME	0x0020
+#define CFG2_SLOTSELECT		0x0040
+#define CFG2_PREAMSELECT	0x0080
+#define CFG2_ADDRLENGTH		0x0100
+#define CFG2_RECVCRC		0x0200
+#define CFG2_XMITNOCRC		0x0400
+#define CFG2_LOOPBACK		0x0800
+#define CFG2_CTRLO		0x1000
+#define CFG2_RESET		0x8000
+
+#define REG_RECVEND		(priv(dev)->seeq + 0x00c0)
+
+#define REG_BUFWIN		(priv(dev)->seeq + 0x0100)
+
+#define REG_RECVPTR		(priv(dev)->seeq + 0x0140)
+
+#define REG_TRANSMITPTR		(priv(dev)->seeq + 0x0180)
+
+#define REG_DMAADDR		(priv(dev)->seeq + 0x01c0)
+
+/*
+ * Cards transmit/receive headers
+ */
+#define TX_NEXT			(0xffff)
+#define TXHDR_ENBABBLEINT	(1 << 16)
+#define TXHDR_ENCOLLISIONINT	(1 << 17)
+#define TXHDR_EN16COLLISION	(1 << 18)
+#define TXHDR_ENSUCCESS		(1 << 19)
+#define TXHDR_DATAFOLLOWS	(1 << 21)
+#define TXHDR_CHAINCONTINUE	(1 << 22)
+#define TXHDR_TRANSMIT		(1 << 23)
+#define TXSTAT_BABBLED		(1 << 24)
+#define TXSTAT_COLLISION	(1 << 25)
+#define TXSTAT_16COLLISIONS	(1 << 26)
+#define TXSTAT_DONE		(1 << 31)
+
+#define RX_NEXT			(0xffff)
+#define RXHDR_CHAINCONTINUE	(1 << 6)
+#define RXHDR_RECEIVE		(1 << 7)
+#define RXSTAT_OVERSIZE		(1 << 8)
+#define RXSTAT_CRCERROR		(1 << 9)
+#define RXSTAT_DRIBBLEERROR	(1 << 10)
+#define RXSTAT_SHORTPACKET	(1 << 11)
+#define RXSTAT_DONE		(1 << 15)
+
+
+#define TX_START	0x0000
+#define TX_END		0x6000
+#define RX_START	0x6000
+#define RX_LEN		0xA000
+#define RX_END		0x10000
+/* must be a power of 2 and greater than MAX_TX_BUFFERED */
+#define MAX_TXED	16
+#define MAX_TX_BUFFERED	10
+
+struct dev_priv {
+    void __iomem *base;
+    void __iomem *seeq;
+    struct {
+	unsigned int command;
+	unsigned int config1;
+	unsigned int config2;
+    } regs;
+    unsigned char tx_head;		/* buffer nr to insert next packet	 */
+    unsigned char tx_tail;		/* buffer nr of transmitting packet	 */
+    unsigned int rx_head;		/* address to fetch next packet from	 */
+    struct timer_list timer;
+    struct net_device *dev;
+    int broken;				/* 0 = ok, 1 = something went wrong	 */
+};
+
+struct ether3_data {
+	const char name[8];
+	unsigned long base_offset;
+};
+
+#endif
diff --git a/drivers/net/ethernet/seeq/sgiseeq.c b/drivers/net/ethernet/seeq/sgiseeq.c
new file mode 100644
index 000000000..96065dfc7
--- /dev/null
+++ b/drivers/net/ethernet/seeq/sgiseeq.c
@@ -0,0 +1,848 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * sgiseeq.c: Seeq8003 ethernet driver for SGI machines.
+ *
+ * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
+ */
+
+#undef DEBUG
+
+#include <linux/dma-mapping.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/platform_device.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+
+#include <asm/sgi/hpc3.h>
+#include <asm/sgi/ip22.h>
+#include <asm/sgi/seeq.h>
+
+#include "sgiseeq.h"
+
+static char *sgiseeqstr = "SGI Seeq8003";
+
+/*
+ * If you want speed, you do something silly, it always has worked for me.  So,
+ * with that in mind, I've decided to make this driver look completely like a
+ * stupid Lance from a driver architecture perspective.  Only difference is that
+ * here our "ring buffer" looks and acts like a real Lance one does but is
+ * laid out like how the HPC DMA and the Seeq want it to.  You'd be surprised
+ * how a stupid idea like this can pay off in performance, not to mention
+ * making this driver 2,000 times easier to write. ;-)
+ */
+
+/* Tune these if we tend to run out often etc. */
+#define SEEQ_RX_BUFFERS  16
+#define SEEQ_TX_BUFFERS  16
+
+#define PKT_BUF_SZ       1584
+
+#define NEXT_RX(i)  (((i) + 1) & (SEEQ_RX_BUFFERS - 1))
+#define NEXT_TX(i)  (((i) + 1) & (SEEQ_TX_BUFFERS - 1))
+#define PREV_RX(i)  (((i) - 1) & (SEEQ_RX_BUFFERS - 1))
+#define PREV_TX(i)  (((i) - 1) & (SEEQ_TX_BUFFERS - 1))
+
+#define TX_BUFFS_AVAIL(sp) ((sp->tx_old <= sp->tx_new) ? \
+			    sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new : \
+			    sp->tx_old - sp->tx_new - 1)
+
+#define VIRT_TO_DMA(sp, v) ((sp)->srings_dma +                                 \
+				  (dma_addr_t)((unsigned long)(v) -            \
+					       (unsigned long)((sp)->rx_desc)))
+
+/* Copy frames shorter than rx_copybreak, otherwise pass on up in
+ * a full sized sk_buff.  Value of 100 stolen from tulip.c (!alpha).
+ */
+static int rx_copybreak = 100;
+
+#define PAD_SIZE    (128 - sizeof(struct hpc_dma_desc) - sizeof(void *))
+
+struct sgiseeq_rx_desc {
+	volatile struct hpc_dma_desc rdma;
+	u8 padding[PAD_SIZE];
+	struct sk_buff *skb;
+};
+
+struct sgiseeq_tx_desc {
+	volatile struct hpc_dma_desc tdma;
+	u8 padding[PAD_SIZE];
+	struct sk_buff *skb;
+};
+
+/*
+ * Warning: This structure is laid out in a certain way because HPC dma
+ *          descriptors must be 8-byte aligned.  So don't touch this without
+ *          some care.
+ */
+struct sgiseeq_init_block { /* Note the name ;-) */
+	struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS];
+	struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS];
+};
+
+struct sgiseeq_private {
+	struct sgiseeq_init_block *srings;
+	dma_addr_t srings_dma;
+
+	/* Ptrs to the descriptors in uncached space. */
+	struct sgiseeq_rx_desc *rx_desc;
+	struct sgiseeq_tx_desc *tx_desc;
+
+	char *name;
+	struct hpc3_ethregs *hregs;
+	struct sgiseeq_regs *sregs;
+
+	/* Ring entry counters. */
+	unsigned int rx_new, tx_new;
+	unsigned int rx_old, tx_old;
+
+	int is_edlc;
+	unsigned char control;
+	unsigned char mode;
+
+	spinlock_t tx_lock;
+};
+
+static inline void dma_sync_desc_cpu(struct net_device *dev, void *addr)
+{
+	struct sgiseeq_private *sp = netdev_priv(dev);
+
+	dma_sync_single_for_cpu(dev->dev.parent, VIRT_TO_DMA(sp, addr),
+			sizeof(struct sgiseeq_rx_desc), DMA_BIDIRECTIONAL);
+}
+
+static inline void dma_sync_desc_dev(struct net_device *dev, void *addr)
+{
+	struct sgiseeq_private *sp = netdev_priv(dev);
+
+	dma_sync_single_for_device(dev->dev.parent, VIRT_TO_DMA(sp, addr),
+			sizeof(struct sgiseeq_rx_desc), DMA_BIDIRECTIONAL);
+}
+
+static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs)
+{
+	hregs->reset = HPC3_ERST_CRESET | HPC3_ERST_CLRIRQ;
+	udelay(20);
+	hregs->reset = 0;
+}
+
+static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs,
+				       struct sgiseeq_regs *sregs)
+{
+	hregs->rx_ctrl = hregs->tx_ctrl = 0;
+	hpc3_eth_reset(hregs);
+}
+
+#define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \
+		       SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC)
+
+static inline void seeq_go(struct sgiseeq_private *sp,
+			   struct hpc3_ethregs *hregs,
+			   struct sgiseeq_regs *sregs)
+{
+	sregs->rstat = sp->mode | RSTAT_GO_BITS;
+	hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE;
+}
+
+static inline void __sgiseeq_set_mac_address(struct net_device *dev)
+{
+	struct sgiseeq_private *sp = netdev_priv(dev);
+	struct sgiseeq_regs *sregs = sp->sregs;
+	int i;
+
+	sregs->tstat = SEEQ_TCMD_RB0;
+	for (i = 0; i < 6; i++)
+		sregs->rw.eth_addr[i] = dev->dev_addr[i];
+}
+
+static int sgiseeq_set_mac_address(struct net_device *dev, void *addr)
+{
+	struct sgiseeq_private *sp = netdev_priv(dev);
+	struct sockaddr *sa = addr;
+
+	eth_hw_addr_set(dev, sa->sa_data);
+
+	spin_lock_irq(&sp->tx_lock);
+	__sgiseeq_set_mac_address(dev);
+	spin_unlock_irq(&sp->tx_lock);
+
+	return 0;
+}
+
+#define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD)
+#define RCNTCFG_INIT  (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE)
+#define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT))
+
+static int seeq_init_ring(struct net_device *dev)
+{
+	struct sgiseeq_private *sp = netdev_priv(dev);
+	int i;
+
+	netif_stop_queue(dev);
+	sp->rx_new = sp->tx_new = 0;
+	sp->rx_old = sp->tx_old = 0;
+
+	__sgiseeq_set_mac_address(dev);
+
+	/* Setup tx ring. */
+	for(i = 0; i < SEEQ_TX_BUFFERS; i++) {
+		sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT;
+		dma_sync_desc_dev(dev, &sp->tx_desc[i]);
+	}
+
+	/* And now the rx ring. */
+	for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
+		if (!sp->rx_desc[i].skb) {
+			dma_addr_t dma_addr;
+			struct sk_buff *skb = netdev_alloc_skb(dev, PKT_BUF_SZ);
+
+			if (skb == NULL)
+				return -ENOMEM;
+			skb_reserve(skb, 2);
+			dma_addr = dma_map_single(dev->dev.parent,
+						  skb->data - 2,
+						  PKT_BUF_SZ, DMA_FROM_DEVICE);
+			sp->rx_desc[i].skb = skb;
+			sp->rx_desc[i].rdma.pbuf = dma_addr;
+		}
+		sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT;
+		dma_sync_desc_dev(dev, &sp->rx_desc[i]);
+	}
+	sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR;
+	dma_sync_desc_dev(dev, &sp->rx_desc[i - 1]);
+	return 0;
+}
+
+static void seeq_purge_ring(struct net_device *dev)
+{
+	struct sgiseeq_private *sp = netdev_priv(dev);
+	int i;
+
+	/* clear tx ring. */
+	for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
+		if (sp->tx_desc[i].skb) {
+			dev_kfree_skb(sp->tx_desc[i].skb);
+			sp->tx_desc[i].skb = NULL;
+		}
+	}
+
+	/* And now the rx ring. */
+	for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
+		if (sp->rx_desc[i].skb) {
+			dev_kfree_skb(sp->rx_desc[i].skb);
+			sp->rx_desc[i].skb = NULL;
+		}
+	}
+}
+
+#ifdef DEBUG
+static struct sgiseeq_private *gpriv;
+static struct net_device *gdev;
+
+static void sgiseeq_dump_rings(void)
+{
+	static int once;
+	struct sgiseeq_rx_desc *r = gpriv->rx_desc;
+	struct sgiseeq_tx_desc *t = gpriv->tx_desc;
+	struct hpc3_ethregs *hregs = gpriv->hregs;
+	int i;
+
+	if (once)
+		return;
+	once++;
+	printk("RING DUMP:\n");
+	for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
+		printk("RX [%d]: @(%p) [%08x,%08x,%08x] ",
+		       i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
+		       r[i].rdma.pnext);
+		i += 1;
+		printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
+		       i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
+		       r[i].rdma.pnext);
+	}
+	for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
+		printk("TX [%d]: @(%p) [%08x,%08x,%08x] ",
+		       i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
+		       t[i].tdma.pnext);
+		i += 1;
+		printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
+		       i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
+		       t[i].tdma.pnext);
+	}
+	printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n",
+	       gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old);
+	printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n",
+	       hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl);
+	printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n",
+	       hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl);
+}
+#endif
+
+#define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF)
+#define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2)
+
+static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp,
+		     struct sgiseeq_regs *sregs)
+{
+	struct hpc3_ethregs *hregs = sp->hregs;
+	int err;
+
+	reset_hpc3_and_seeq(hregs, sregs);
+	err = seeq_init_ring(dev);
+	if (err)
+		return err;
+
+	/* Setup to field the proper interrupt types. */
+	if (sp->is_edlc) {
+		sregs->tstat = TSTAT_INIT_EDLC;
+		sregs->rw.wregs.control = sp->control;
+		sregs->rw.wregs.frame_gap = 0;
+	} else {
+		sregs->tstat = TSTAT_INIT_SEEQ;
+	}
+
+	hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc);
+	hregs->tx_ndptr = VIRT_TO_DMA(sp, sp->tx_desc);
+
+	seeq_go(sp, hregs, sregs);
+	return 0;
+}
+
+static void record_rx_errors(struct net_device *dev, unsigned char status)
+{
+	if (status & SEEQ_RSTAT_OVERF ||
+	    status & SEEQ_RSTAT_SFRAME)
+		dev->stats.rx_over_errors++;
+	if (status & SEEQ_RSTAT_CERROR)
+		dev->stats.rx_crc_errors++;
+	if (status & SEEQ_RSTAT_DERROR)
+		dev->stats.rx_frame_errors++;
+	if (status & SEEQ_RSTAT_REOF)
+		dev->stats.rx_errors++;
+}
+
+static inline void rx_maybe_restart(struct sgiseeq_private *sp,
+				    struct hpc3_ethregs *hregs,
+				    struct sgiseeq_regs *sregs)
+{
+	if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) {
+		hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc + sp->rx_new);
+		seeq_go(sp, hregs, sregs);
+	}
+}
+
+static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp,
+			      struct hpc3_ethregs *hregs,
+			      struct sgiseeq_regs *sregs)
+{
+	struct sgiseeq_rx_desc *rd;
+	struct sk_buff *skb = NULL;
+	struct sk_buff *newskb;
+	unsigned char pkt_status;
+	int len = 0;
+	unsigned int orig_end = PREV_RX(sp->rx_new);
+
+	/* Service every received packet. */
+	rd = &sp->rx_desc[sp->rx_new];
+	dma_sync_desc_cpu(dev, rd);
+	while (!(rd->rdma.cntinfo & HPCDMA_OWN)) {
+		len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3;
+		dma_unmap_single(dev->dev.parent, rd->rdma.pbuf,
+				 PKT_BUF_SZ, DMA_FROM_DEVICE);
+		pkt_status = rd->skb->data[len];
+		if (pkt_status & SEEQ_RSTAT_FIG) {
+			/* Packet is OK. */
+			/* We don't want to receive our own packets */
+			if (!ether_addr_equal(rd->skb->data + 6, dev->dev_addr)) {
+				if (len > rx_copybreak) {
+					skb = rd->skb;
+					newskb = netdev_alloc_skb(dev, PKT_BUF_SZ);
+					if (!newskb) {
+						newskb = skb;
+						skb = NULL;
+						goto memory_squeeze;
+					}
+					skb_reserve(newskb, 2);
+				} else {
+					skb = netdev_alloc_skb_ip_align(dev, len);
+					if (skb)
+						skb_copy_to_linear_data(skb, rd->skb->data, len);
+
+					newskb = rd->skb;
+				}
+memory_squeeze:
+				if (skb) {
+					skb_put(skb, len);
+					skb->protocol = eth_type_trans(skb, dev);
+					netif_rx(skb);
+					dev->stats.rx_packets++;
+					dev->stats.rx_bytes += len;
+				} else {
+					dev->stats.rx_dropped++;
+				}
+			} else {
+				/* Silently drop my own packets */
+				newskb = rd->skb;
+			}
+		} else {
+			record_rx_errors(dev, pkt_status);
+			newskb = rd->skb;
+		}
+		rd->skb = newskb;
+		rd->rdma.pbuf = dma_map_single(dev->dev.parent,
+					       newskb->data - 2,
+					       PKT_BUF_SZ, DMA_FROM_DEVICE);
+
+		/* Return the entry to the ring pool. */
+		rd->rdma.cntinfo = RCNTINFO_INIT;
+		sp->rx_new = NEXT_RX(sp->rx_new);
+		dma_sync_desc_dev(dev, rd);
+		rd = &sp->rx_desc[sp->rx_new];
+		dma_sync_desc_cpu(dev, rd);
+	}
+	dma_sync_desc_dev(dev, rd);
+
+	dma_sync_desc_cpu(dev, &sp->rx_desc[orig_end]);
+	sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR);
+	dma_sync_desc_dev(dev, &sp->rx_desc[orig_end]);
+	dma_sync_desc_cpu(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]);
+	sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR;
+	dma_sync_desc_dev(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]);
+	rx_maybe_restart(sp, hregs, sregs);
+}
+
+static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp,
+					     struct sgiseeq_regs *sregs)
+{
+	if (sp->is_edlc) {
+		sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT);
+		sregs->rw.wregs.control = sp->control;
+	}
+}
+
+static inline void kick_tx(struct net_device *dev,
+			   struct sgiseeq_private *sp,
+			   struct hpc3_ethregs *hregs)
+{
+	struct sgiseeq_tx_desc *td;
+	int i = sp->tx_old;
+
+	/* If the HPC aint doin nothin, and there are more packets
+	 * with ETXD cleared and XIU set we must make very certain
+	 * that we restart the HPC else we risk locking up the
+	 * adapter.  The following code is only safe iff the HPCDMA
+	 * is not active!
+	 */
+	td = &sp->tx_desc[i];
+	dma_sync_desc_cpu(dev, td);
+	while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) ==
+	      (HPCDMA_XIU | HPCDMA_ETXD)) {
+		i = NEXT_TX(i);
+		td = &sp->tx_desc[i];
+		dma_sync_desc_cpu(dev, td);
+	}
+	if (td->tdma.cntinfo & HPCDMA_XIU) {
+		dma_sync_desc_dev(dev, td);
+		hregs->tx_ndptr = VIRT_TO_DMA(sp, td);
+		hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
+	}
+}
+
+static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp,
+			      struct hpc3_ethregs *hregs,
+			      struct sgiseeq_regs *sregs)
+{
+	struct sgiseeq_tx_desc *td;
+	unsigned long status = hregs->tx_ctrl;
+	int j;
+
+	tx_maybe_reset_collisions(sp, sregs);
+
+	if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) {
+		/* Oops, HPC detected some sort of error. */
+		if (status & SEEQ_TSTAT_R16)
+			dev->stats.tx_aborted_errors++;
+		if (status & SEEQ_TSTAT_UFLOW)
+			dev->stats.tx_fifo_errors++;
+		if (status & SEEQ_TSTAT_LCLS)
+			dev->stats.collisions++;
+	}
+
+	/* Ack 'em... */
+	for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) {
+		td = &sp->tx_desc[j];
+
+		dma_sync_desc_cpu(dev, td);
+		if (!(td->tdma.cntinfo & (HPCDMA_XIU)))
+			break;
+		if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) {
+			dma_sync_desc_dev(dev, td);
+			if (!(status & HPC3_ETXCTRL_ACTIVE)) {
+				hregs->tx_ndptr = VIRT_TO_DMA(sp, td);
+				hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
+			}
+			break;
+		}
+		dev->stats.tx_packets++;
+		sp->tx_old = NEXT_TX(sp->tx_old);
+		td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE);
+		td->tdma.cntinfo |= HPCDMA_EOX;
+		if (td->skb) {
+			dev_kfree_skb_any(td->skb);
+			td->skb = NULL;
+		}
+		dma_sync_desc_dev(dev, td);
+	}
+}
+
+static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id)
+{
+	struct net_device *dev = (struct net_device *) dev_id;
+	struct sgiseeq_private *sp = netdev_priv(dev);
+	struct hpc3_ethregs *hregs = sp->hregs;
+	struct sgiseeq_regs *sregs = sp->sregs;
+
+	spin_lock(&sp->tx_lock);
+
+	/* Ack the IRQ and set software state. */
+	hregs->reset = HPC3_ERST_CLRIRQ;
+
+	/* Always check for received packets. */
+	sgiseeq_rx(dev, sp, hregs, sregs);
+
+	/* Only check for tx acks if we have something queued. */
+	if (sp->tx_old != sp->tx_new)
+		sgiseeq_tx(dev, sp, hregs, sregs);
+
+	if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) {
+		netif_wake_queue(dev);
+	}
+	spin_unlock(&sp->tx_lock);
+
+	return IRQ_HANDLED;
+}
+
+static int sgiseeq_open(struct net_device *dev)
+{
+	struct sgiseeq_private *sp = netdev_priv(dev);
+	struct sgiseeq_regs *sregs = sp->sregs;
+	unsigned int irq = dev->irq;
+	int err;
+
+	if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) {
+		printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq);
+		return -EAGAIN;
+	}
+
+	err = init_seeq(dev, sp, sregs);
+	if (err)
+		goto out_free_irq;
+
+	netif_start_queue(dev);
+
+	return 0;
+
+out_free_irq:
+	free_irq(irq, dev);
+
+	return err;
+}
+
+static int sgiseeq_close(struct net_device *dev)
+{
+	struct sgiseeq_private *sp = netdev_priv(dev);
+	struct sgiseeq_regs *sregs = sp->sregs;
+	unsigned int irq = dev->irq;
+
+	netif_stop_queue(dev);
+
+	/* Shutdown the Seeq. */
+	reset_hpc3_and_seeq(sp->hregs, sregs);
+	free_irq(irq, dev);
+	seeq_purge_ring(dev);
+
+	return 0;
+}
+
+static inline int sgiseeq_reset(struct net_device *dev)
+{
+	struct sgiseeq_private *sp = netdev_priv(dev);
+	struct sgiseeq_regs *sregs = sp->sregs;
+	int err;
+
+	err = init_seeq(dev, sp, sregs);
+	if (err)
+		return err;
+
+	netif_trans_update(dev); /* prevent tx timeout */
+	netif_wake_queue(dev);
+
+	return 0;
+}
+
+static netdev_tx_t
+sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct sgiseeq_private *sp = netdev_priv(dev);
+	struct hpc3_ethregs *hregs = sp->hregs;
+	unsigned long flags;
+	struct sgiseeq_tx_desc *td;
+	int len, entry;
+
+	spin_lock_irqsave(&sp->tx_lock, flags);
+
+	/* Setup... */
+	len = skb->len;
+	if (len < ETH_ZLEN) {
+		if (skb_padto(skb, ETH_ZLEN)) {
+			spin_unlock_irqrestore(&sp->tx_lock, flags);
+			return NETDEV_TX_OK;
+		}
+		len = ETH_ZLEN;
+	}
+
+	dev->stats.tx_bytes += len;
+	entry = sp->tx_new;
+	td = &sp->tx_desc[entry];
+	dma_sync_desc_cpu(dev, td);
+
+	/* Create entry.  There are so many races with adding a new
+	 * descriptor to the chain:
+	 * 1) Assume that the HPC is off processing a DMA chain while
+	 *    we are changing all of the following.
+	 * 2) Do no allow the HPC to look at a new descriptor until
+	 *    we have completely set up it's state.  This means, do
+	 *    not clear HPCDMA_EOX in the current last descritptor
+	 *    until the one we are adding looks consistent and could
+	 *    be processes right now.
+	 * 3) The tx interrupt code must notice when we've added a new
+	 *    entry and the HPC got to the end of the chain before we
+	 *    added this new entry and restarted it.
+	 */
+	td->skb = skb;
+	td->tdma.pbuf = dma_map_single(dev->dev.parent, skb->data,
+				       len, DMA_TO_DEVICE);
+	td->tdma.cntinfo = (len & HPCDMA_BCNT) |
+	                   HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX;
+	dma_sync_desc_dev(dev, td);
+	if (sp->tx_old != sp->tx_new) {
+		struct sgiseeq_tx_desc *backend;
+
+		backend = &sp->tx_desc[PREV_TX(sp->tx_new)];
+		dma_sync_desc_cpu(dev, backend);
+		backend->tdma.cntinfo &= ~HPCDMA_EOX;
+		dma_sync_desc_dev(dev, backend);
+	}
+	sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */
+
+	/* Maybe kick the HPC back into motion. */
+	if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE))
+		kick_tx(dev, sp, hregs);
+
+	if (!TX_BUFFS_AVAIL(sp))
+		netif_stop_queue(dev);
+	spin_unlock_irqrestore(&sp->tx_lock, flags);
+
+	return NETDEV_TX_OK;
+}
+
+static void timeout(struct net_device *dev, unsigned int txqueue)
+{
+	printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name);
+	sgiseeq_reset(dev);
+
+	netif_trans_update(dev); /* prevent tx timeout */
+	netif_wake_queue(dev);
+}
+
+static void sgiseeq_set_multicast(struct net_device *dev)
+{
+	struct sgiseeq_private *sp = netdev_priv(dev);
+	unsigned char oldmode = sp->mode;
+
+	if(dev->flags & IFF_PROMISC)
+		sp->mode = SEEQ_RCMD_RANY;
+	else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev))
+		sp->mode = SEEQ_RCMD_RBMCAST;
+	else
+		sp->mode = SEEQ_RCMD_RBCAST;
+
+	/* XXX I know this sucks, but is there a better way to reprogram
+	 * XXX the receiver? At least, this shouldn't happen too often.
+	 */
+
+	if (oldmode != sp->mode)
+		sgiseeq_reset(dev);
+}
+
+static inline void setup_tx_ring(struct net_device *dev,
+				 struct sgiseeq_tx_desc *buf,
+				 int nbufs)
+{
+	struct sgiseeq_private *sp = netdev_priv(dev);
+	int i = 0;
+
+	while (i < (nbufs - 1)) {
+		buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf + i + 1);
+		buf[i].tdma.pbuf = 0;
+		dma_sync_desc_dev(dev, &buf[i]);
+		i++;
+	}
+	buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf);
+	dma_sync_desc_dev(dev, &buf[i]);
+}
+
+static inline void setup_rx_ring(struct net_device *dev,
+				 struct sgiseeq_rx_desc *buf,
+				 int nbufs)
+{
+	struct sgiseeq_private *sp = netdev_priv(dev);
+	int i = 0;
+
+	while (i < (nbufs - 1)) {
+		buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf + i + 1);
+		buf[i].rdma.pbuf = 0;
+		dma_sync_desc_dev(dev, &buf[i]);
+		i++;
+	}
+	buf[i].rdma.pbuf = 0;
+	buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf);
+	dma_sync_desc_dev(dev, &buf[i]);
+}
+
+static const struct net_device_ops sgiseeq_netdev_ops = {
+	.ndo_open		= sgiseeq_open,
+	.ndo_stop		= sgiseeq_close,
+	.ndo_start_xmit		= sgiseeq_start_xmit,
+	.ndo_tx_timeout		= timeout,
+	.ndo_set_rx_mode	= sgiseeq_set_multicast,
+	.ndo_set_mac_address	= sgiseeq_set_mac_address,
+	.ndo_validate_addr	= eth_validate_addr,
+};
+
+static int sgiseeq_probe(struct platform_device *pdev)
+{
+	struct sgiseeq_platform_data *pd = dev_get_platdata(&pdev->dev);
+	struct hpc3_regs *hpcregs = pd->hpc;
+	struct sgiseeq_init_block *sr;
+	unsigned int irq = pd->irq;
+	struct sgiseeq_private *sp;
+	struct net_device *dev;
+	int err;
+
+	dev = alloc_etherdev(sizeof (struct sgiseeq_private));
+	if (!dev) {
+		err = -ENOMEM;
+		goto err_out;
+	}
+
+	platform_set_drvdata(pdev, dev);
+	SET_NETDEV_DEV(dev, &pdev->dev);
+	sp = netdev_priv(dev);
+
+	/* Make private data page aligned */
+	sr = dma_alloc_noncoherent(&pdev->dev, sizeof(*sp->srings),
+			&sp->srings_dma, DMA_BIDIRECTIONAL, GFP_KERNEL);
+	if (!sr) {
+		printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n");
+		err = -ENOMEM;
+		goto err_out_free_dev;
+	}
+	sp->srings = sr;
+	sp->rx_desc = sp->srings->rxvector;
+	sp->tx_desc = sp->srings->txvector;
+	spin_lock_init(&sp->tx_lock);
+
+	/* A couple calculations now, saves many cycles later. */
+	setup_rx_ring(dev, sp->rx_desc, SEEQ_RX_BUFFERS);
+	setup_tx_ring(dev, sp->tx_desc, SEEQ_TX_BUFFERS);
+
+	eth_hw_addr_set(dev, pd->mac);
+
+#ifdef DEBUG
+	gpriv = sp;
+	gdev = dev;
+#endif
+	sp->sregs = (struct sgiseeq_regs *) &hpcregs->eth_ext[0];
+	sp->hregs = &hpcregs->ethregs;
+	sp->name = sgiseeqstr;
+	sp->mode = SEEQ_RCMD_RBCAST;
+
+	/* Setup PIO and DMA transfer timing */
+	sp->hregs->pconfig = 0x161;
+	sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP |
+			     HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026;
+
+	/* Setup PIO and DMA transfer timing */
+	sp->hregs->pconfig = 0x161;
+	sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP |
+			     HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026;
+
+	/* Reset the chip. */
+	hpc3_eth_reset(sp->hregs);
+
+	sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff);
+	if (sp->is_edlc)
+		sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT |
+			      SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT |
+			      SEEQ_CTRL_ENCARR;
+
+	dev->netdev_ops		= &sgiseeq_netdev_ops;
+	dev->watchdog_timeo	= (200 * HZ) / 1000;
+	dev->irq		= irq;
+
+	if (register_netdev(dev)) {
+		printk(KERN_ERR "Sgiseeq: Cannot register net device, "
+		       "aborting.\n");
+		err = -ENODEV;
+		goto err_out_free_attrs;
+	}
+
+	printk(KERN_INFO "%s: %s %pM\n", dev->name, sgiseeqstr, dev->dev_addr);
+
+	return 0;
+
+err_out_free_attrs:
+	dma_free_noncoherent(&pdev->dev, sizeof(*sp->srings), sp->srings,
+		       sp->srings_dma, DMA_BIDIRECTIONAL);
+err_out_free_dev:
+	free_netdev(dev);
+
+err_out:
+	return err;
+}
+
+static int sgiseeq_remove(struct platform_device *pdev)
+{
+	struct net_device *dev = platform_get_drvdata(pdev);
+	struct sgiseeq_private *sp = netdev_priv(dev);
+
+	unregister_netdev(dev);
+	dma_free_noncoherent(&pdev->dev, sizeof(*sp->srings), sp->srings,
+		       sp->srings_dma, DMA_BIDIRECTIONAL);
+	free_netdev(dev);
+
+	return 0;
+}
+
+static struct platform_driver sgiseeq_driver = {
+	.probe	= sgiseeq_probe,
+	.remove	= sgiseeq_remove,
+	.driver = {
+		.name	= "sgiseeq",
+	}
+};
+
+module_platform_driver(sgiseeq_driver);
+
+MODULE_DESCRIPTION("SGI Seeq 8003 driver");
+MODULE_AUTHOR("Linux/MIPS Mailing List <linux-mips@linux-mips.org>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:sgiseeq");
diff --git a/drivers/net/ethernet/seeq/sgiseeq.h b/drivers/net/ethernet/seeq/sgiseeq.h
new file mode 100644
index 000000000..2f65c5560
--- /dev/null
+++ b/drivers/net/ethernet/seeq/sgiseeq.h
@@ -0,0 +1,104 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * sgiseeq.h: Defines for the Seeq8003 ethernet controller.
+ *
+ * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
+ */
+#ifndef _SGISEEQ_H
+#define _SGISEEQ_H
+
+struct sgiseeq_wregs {
+	volatile unsigned int multicase_high[2];
+	volatile unsigned int frame_gap;
+	volatile unsigned int control;
+};
+
+struct sgiseeq_rregs {
+	volatile unsigned int collision_tx[2];
+	volatile unsigned int collision_all[2];
+	volatile unsigned int _unused0;
+	volatile unsigned int rflags;
+};
+
+struct sgiseeq_regs {
+	union {
+		volatile unsigned int eth_addr[6];
+		volatile unsigned int multicast_low[6];
+		struct sgiseeq_wregs wregs;
+		struct sgiseeq_rregs rregs;
+	} rw;
+	volatile unsigned int rstat;
+	volatile unsigned int tstat;
+};
+
+/* Seeq8003 receive status register */
+#define SEEQ_RSTAT_OVERF   0x001 /* Overflow */
+#define SEEQ_RSTAT_CERROR  0x002 /* CRC error */
+#define SEEQ_RSTAT_DERROR  0x004 /* Dribble error */
+#define SEEQ_RSTAT_SFRAME  0x008 /* Short frame */
+#define SEEQ_RSTAT_REOF    0x010 /* Received end of frame */
+#define SEEQ_RSTAT_FIG     0x020 /* Frame is good */
+#define SEEQ_RSTAT_TIMEO   0x040 /* Timeout, or late receive */
+#define SEEQ_RSTAT_WHICH   0x080 /* Which status, 1=old 0=new */
+#define SEEQ_RSTAT_LITTLE  0x100 /* DMA is done in little endian format */
+#define SEEQ_RSTAT_SDMA    0x200 /* DMA has started */
+#define SEEQ_RSTAT_ADMA    0x400 /* DMA is active */
+#define SEEQ_RSTAT_ROVERF  0x800 /* Receive buffer overflow */
+
+/* Seeq8003 receive command register */
+#define SEEQ_RCMD_RDISAB   0x000 /* Disable receiver on the Seeq8003 */
+#define SEEQ_RCMD_IOVERF   0x001 /* IRQ on buffer overflows */
+#define SEEQ_RCMD_ICRC     0x002 /* IRQ on CRC errors */
+#define SEEQ_RCMD_IDRIB    0x004 /* IRQ on dribble errors */
+#define SEEQ_RCMD_ISHORT   0x008 /* IRQ on short frames */
+#define SEEQ_RCMD_IEOF     0x010 /* IRQ on end of frame */
+#define SEEQ_RCMD_IGOOD    0x020 /* IRQ on good frames */
+#define SEEQ_RCMD_RANY     0x040 /* Receive any frame */
+#define SEEQ_RCMD_RBCAST   0x080 /* Receive broadcasts */
+#define SEEQ_RCMD_RBMCAST  0x0c0 /* Receive broadcasts/multicasts */
+
+/* Seeq8003 transmit status register */
+#define SEEQ_TSTAT_UFLOW   0x001 /* Transmit buffer underflow */
+#define SEEQ_TSTAT_CLS     0x002 /* Collision detected */
+#define SEEQ_TSTAT_R16     0x004 /* Did 16 retries to tx a frame */
+#define SEEQ_TSTAT_PTRANS  0x008 /* Packet was transmitted ok */
+#define SEEQ_TSTAT_LCLS    0x010 /* Late collision occurred */
+#define SEEQ_TSTAT_WHICH   0x080 /* Which status, 1=old 0=new */
+#define SEEQ_TSTAT_TLE     0x100 /* DMA is done in little endian format */
+#define SEEQ_TSTAT_SDMA    0x200 /* DMA has started */
+#define SEEQ_TSTAT_ADMA    0x400 /* DMA is active */
+
+/* Seeq8003 transmit command register */
+#define SEEQ_TCMD_RB0      0x00 /* Register bank zero w/station addr */
+#define SEEQ_TCMD_IUF      0x01 /* IRQ on tx underflow */
+#define SEEQ_TCMD_IC       0x02 /* IRQ on collisions */
+#define SEEQ_TCMD_I16      0x04 /* IRQ after 16 failed attempts to tx frame */
+#define SEEQ_TCMD_IPT      0x08 /* IRQ when packet successfully transmitted */
+#define SEEQ_TCMD_RB1      0x20 /* Register bank one w/multi-cast low byte */
+#define SEEQ_TCMD_RB2      0x40 /* Register bank two w/multi-cast high byte */
+
+/* Seeq8003 control register */
+#define SEEQ_CTRL_XCNT     0x01
+#define SEEQ_CTRL_ACCNT    0x02
+#define SEEQ_CTRL_SFLAG    0x04
+#define SEEQ_CTRL_EMULTI   0x08
+#define SEEQ_CTRL_ESHORT   0x10
+#define SEEQ_CTRL_ENCARR   0x20
+
+/* Seeq8003 control registers on the SGI Hollywood HPC. */
+#define SEEQ_HPIO_P1BITS  0x00000001 /* cycles to stay in P1 phase for PIO */
+#define SEEQ_HPIO_P2BITS  0x00000060 /* cycles to stay in P2 phase for PIO */
+#define SEEQ_HPIO_P3BITS  0x00000100 /* cycles to stay in P3 phase for PIO */
+#define SEEQ_HDMA_D1BITS  0x00000006 /* cycles to stay in D1 phase for DMA */
+#define SEEQ_HDMA_D2BITS  0x00000020 /* cycles to stay in D2 phase for DMA */
+#define SEEQ_HDMA_D3BITS  0x00000000 /* cycles to stay in D3 phase for DMA */
+#define SEEQ_HDMA_TIMEO   0x00030000 /* cycles for DMA timeout */
+#define SEEQ_HCTL_NORM    0x00000000 /* Normal operation mode */
+#define SEEQ_HCTL_RESET   0x00000001 /* Reset Seeq8003 and HPC interface */
+#define SEEQ_HCTL_IPEND   0x00000002 /* IRQ is pending for the chip */
+#define SEEQ_HCTL_IPG     0x00001000 /* Inter-packet gap */
+#define SEEQ_HCTL_RFIX    0x00002000 /* At rxdc, clear end-of-packet */
+#define SEEQ_HCTL_EFIX    0x00004000 /* fixes intr status bit settings */
+#define SEEQ_HCTL_IFIX    0x00008000 /* enable startup timeouts */
+
+#endif /* !(_SGISEEQ_H) */