Linux-2.6.12-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, 1110 insertions, 0 deletions

diff --git a/drivers/net/arm/ether1.c b/drivers/net/arm/ether1.c
new file mode 100644
index 000000000000..36475eb2727f
--- /dev/null
+++ b/drivers/net/arm/ether1.c
@@ -0,0 +1,1110 @@
+/*
+ *  linux/drivers/acorn/net/ether1.c
+ *
+ *  Copyright (C) 1996-2000 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  Acorn ether1 driver (82586 chip) for Acorn machines
+ *
+ * We basically keep two queues in the cards memory - one for transmit
+ * and one for receive.  Each has a head and a tail.  The head is where
+ * we/the chip adds packets to be transmitted/received, and the tail
+ * is where the transmitter has got to/where the receiver will stop.
+ * Both of these queues are circular, and since the chip is running
+ * all the time, we have to be careful when we modify the pointers etc
+ * so that the buffer memory contents is valid all the time.
+ *
+ * Change log:
+ * 1.00	RMK			Released
+ * 1.01	RMK	19/03/1996	Transfers the last odd byte onto/off of the card now.
+ * 1.02	RMK	25/05/1997	Added code to restart RU if it goes not ready
+ * 1.03	RMK	14/09/1997	Cleaned up the handling of a reset during the TX interrupt.
+ *				Should prevent lockup.
+ * 1.04 RMK	17/09/1997	Added more info when initialsation of chip goes wrong.
+ *				TDR now only reports failure when chip reports non-zero
+ *				TDR time-distance.
+ * 1.05	RMK	31/12/1997	Removed calls to dev_tint for 2.1
+ * 1.06	RMK	10/02/2000	Updated for 2.3.43
+ * 1.07	RMK	13/05/2000	Updated for 2.3.99-pre8
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/bitops.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/ecard.h>
+
+#define __ETHER1_C
+#include "ether1.h"
+
+static unsigned int net_debug = NET_DEBUG;
+
+#define BUFFER_SIZE	0x10000
+#define TX_AREA_START	0x00100
+#define TX_AREA_END	0x05000
+#define RX_AREA_START	0x05000
+#define RX_AREA_END	0x0fc00
+
+static int ether1_open(struct net_device *dev);
+static int ether1_sendpacket(struct sk_buff *skb, struct net_device *dev);
+static irqreturn_t ether1_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static int ether1_close(struct net_device *dev);
+static struct net_device_stats *ether1_getstats(struct net_device *dev);
+static void ether1_setmulticastlist(struct net_device *dev);
+static void ether1_timeout(struct net_device *dev);
+
+/* ------------------------------------------------------------------------- */
+
+static char version[] __initdata = "ether1 ethernet driver (c) 2000 Russell King v1.07\n";
+
+#define BUS_16 16
+#define BUS_8  8
+
+/* ------------------------------------------------------------------------- */
+
+#define DISABLEIRQS 1
+#define NORMALIRQS  0
+
+#define ether1_readw(dev, addr, type, offset, svflgs) ether1_inw_p (dev, addr + (int)(&((type *)0)->offset), svflgs)
+#define ether1_writew(dev, val, addr, type, offset, svflgs) ether1_outw_p (dev, val, addr + (int)(&((type *)0)->offset), svflgs)
+
+static inline unsigned short
+ether1_inw_p (struct net_device *dev, int addr, int svflgs)
+{
+	unsigned long flags;
+	unsigned short ret;
+
+	if (svflgs)
+		local_irq_save (flags);
+
+	writeb(addr >> 12, REG_PAGE);
+	ret = readw(ETHER1_RAM + ((addr & 4095) << 1));
+	if (svflgs)
+		local_irq_restore (flags);
+	return ret;
+}
+
+static inline void
+ether1_outw_p (struct net_device *dev, unsigned short val, int addr, int svflgs)
+{
+	unsigned long flags;
+
+	if (svflgs)
+		local_irq_save (flags);
+
+	writeb(addr >> 12, REG_PAGE);
+	writew(val, ETHER1_RAM + ((addr & 4095) << 1));
+	if (svflgs)
+		local_irq_restore (flags);
+}
+
+/*
+ * Some inline assembler to allow fast transfers on to/off of the card.
+ * Since this driver depends on some features presented by the ARM
+ * specific architecture, and that you can't configure this driver
+ * without specifiing ARM mode, this is not a problem.
+ *
+ * This routine is essentially an optimised memcpy from the card's
+ * onboard RAM to kernel memory.
+ */
+static void
+ether1_writebuffer (struct net_device *dev, void *data, unsigned int start, unsigned int length)
+{
+	unsigned int page, thislen, offset;
+	void __iomem *addr;
+
+	offset = start & 4095;
+	page = start >> 12;
+	addr = ETHER1_RAM + (offset << 1);
+
+	if (offset + length > 4096)
+		thislen = 4096 - offset;
+	else
+		thislen = length;
+
+	do {
+		int used;
+
+		writeb(page, REG_PAGE);
+		length -= thislen;
+
+		__asm__ __volatile__(
+	"subs	%3, %3, #2\n\
+	bmi	2f\n\
+1:	ldr	%0, [%1], #2\n\
+	mov	%0, %0, lsl #16\n\
+	orr	%0, %0, %0, lsr #16\n\
+	str	%0, [%2], #4\n\
+	subs	%3, %3, #2\n\
+	bmi	2f\n\
+	ldr	%0, [%1], #2\n\
+	mov	%0, %0, lsl #16\n\
+	orr	%0, %0, %0, lsr #16\n\
+	str	%0, [%2], #4\n\
+	subs	%3, %3, #2\n\
+	bmi	2f\n\
+	ldr	%0, [%1], #2\n\
+	mov	%0, %0, lsl #16\n\
+	orr	%0, %0, %0, lsr #16\n\
+	str	%0, [%2], #4\n\
+	subs	%3, %3, #2\n\
+	bmi	2f\n\
+	ldr	%0, [%1], #2\n\
+	mov	%0, %0, lsl #16\n\
+	orr	%0, %0, %0, lsr #16\n\
+	str	%0, [%2], #4\n\
+	subs	%3, %3, #2\n\
+	bpl	1b\n\
+2:	adds	%3, %3, #1\n\
+	ldreqb	%0, [%1]\n\
+	streqb	%0, [%2]"
+		: "=&r" (used), "=&r" (data)
+		: "r"  (addr), "r" (thislen), "1" (data));
+
+		addr = ETHER1_RAM;
+
+		thislen = length;
+		if (thislen > 4096)
+			thislen = 4096;
+		page++;
+	} while (thislen);
+}
+
+static void
+ether1_readbuffer (struct net_device *dev, void *data, unsigned int start, unsigned int length)
+{
+	unsigned int page, thislen, offset;
+	void __iomem *addr;
+
+	offset = start & 4095;
+	page = start >> 12;
+	addr = ETHER1_RAM + (offset << 1);
+
+	if (offset + length > 4096)
+		thislen = 4096 - offset;
+	else
+		thislen = length;
+
+	do {
+		int used;
+
+		writeb(page, REG_PAGE);
+		length -= thislen;
+
+		__asm__ __volatile__(
+	"subs	%3, %3, #2\n\
+	bmi	2f\n\
+1:	ldr	%0, [%2], #4\n\
+	strb	%0, [%1], #1\n\
+	mov	%0, %0, lsr #8\n\
+	strb	%0, [%1], #1\n\
+	subs	%3, %3, #2\n\
+	bmi	2f\n\
+	ldr	%0, [%2], #4\n\
+	strb	%0, [%1], #1\n\
+	mov	%0, %0, lsr #8\n\
+	strb	%0, [%1], #1\n\
+	subs	%3, %3, #2\n\
+	bmi	2f\n\
+	ldr	%0, [%2], #4\n\
+	strb	%0, [%1], #1\n\
+	mov	%0, %0, lsr #8\n\
+	strb	%0, [%1], #1\n\
+	subs	%3, %3, #2\n\
+	bmi	2f\n\
+	ldr	%0, [%2], #4\n\
+	strb	%0, [%1], #1\n\
+	mov	%0, %0, lsr #8\n\
+	strb	%0, [%1], #1\n\
+	subs	%3, %3, #2\n\
+	bpl	1b\n\
+2:	adds	%3, %3, #1\n\
+	ldreqb	%0, [%2]\n\
+	streqb	%0, [%1]"
+		: "=&r" (used), "=&r" (data)
+		: "r"  (addr), "r" (thislen), "1" (data));
+
+		addr = ETHER1_RAM;
+
+		thislen = length;
+		if (thislen > 4096)
+			thislen = 4096;
+		page++;
+	} while (thislen);
+}
+
+static int __init
+ether1_ramtest(struct net_device *dev, unsigned char byte)
+{
+	unsigned char *buffer = kmalloc (BUFFER_SIZE, GFP_KERNEL);
+	int i, ret = BUFFER_SIZE;
+	int max_errors = 15;
+	int bad = -1;
+	int bad_start = 0;
+
+	if (!buffer)
+		return 1;
+
+	memset (buffer, byte, BUFFER_SIZE);
+	ether1_writebuffer (dev, buffer, 0, BUFFER_SIZE);
+	memset (buffer, byte ^ 0xff, BUFFER_SIZE);
+	ether1_readbuffer (dev, buffer, 0, BUFFER_SIZE);
+
+	for (i = 0; i < BUFFER_SIZE; i++) {
+		if (buffer[i] != byte) {
+			if (max_errors >= 0 && bad != buffer[i]) {
+				if (bad != -1)
+					printk ("\n");
+				printk (KERN_CRIT "%s: RAM failed with (%02X instead of %02X) at 0x%04X",
+					dev->name, buffer[i], byte, i);
+				ret = -ENODEV;
+				max_errors --;
+				bad = buffer[i];
+				bad_start = i;
+			}
+		} else {
+			if (bad != -1) {
+			    	if (bad_start == i - 1)
+					printk ("\n");
+				else
+					printk (" - 0x%04X\n", i - 1);
+				bad = -1;
+			}
+		}
+	}
+
+	if (bad != -1)
+		printk (" - 0x%04X\n", BUFFER_SIZE);
+	kfree (buffer);
+
+	return ret;
+}
+
+static int
+ether1_reset (struct net_device *dev)
+{
+	writeb(CTRL_RST|CTRL_ACK, REG_CONTROL);
+	return BUS_16;
+}
+
+static int __init
+ether1_init_2(struct net_device *dev)
+{
+	int i;
+	dev->mem_start = 0;
+
+	i = ether1_ramtest (dev, 0x5a);
+
+	if (i > 0)
+		i = ether1_ramtest (dev, 0x1e);
+
+	if (i <= 0)
+	    	return -ENODEV;
+
+	dev->mem_end = i;
+	return 0;
+}
+
+/*
+ * These are the structures that are loaded into the ether RAM card to
+ * initialise the 82586
+ */
+
+/* at 0x0100 */
+#define NOP_ADDR	(TX_AREA_START)
+#define NOP_SIZE	(0x06)
+static nop_t  init_nop  = {
+	0,
+	CMD_NOP,
+	NOP_ADDR
+};
+
+/* at 0x003a */
+#define TDR_ADDR	(0x003a)
+#define TDR_SIZE	(0x08)
+static tdr_t  init_tdr	= {
+	0,
+	CMD_TDR | CMD_INTR,
+	NOP_ADDR,
+	0
+};
+
+/* at 0x002e */
+#define MC_ADDR		(0x002e)
+#define MC_SIZE		(0x0c)
+static mc_t   init_mc   = {
+	0,
+	CMD_SETMULTICAST,
+	TDR_ADDR,
+	0,
+	{ { 0, } }
+};
+
+/* at 0x0022 */
+#define SA_ADDR		(0x0022)
+#define SA_SIZE		(0x0c)
+static sa_t   init_sa   = {
+	0,
+	CMD_SETADDRESS,
+	MC_ADDR,
+	{ 0, }
+};
+
+/* at 0x0010 */
+#define CFG_ADDR	(0x0010)
+#define CFG_SIZE	(0x12)
+static cfg_t  init_cfg  = {
+	0,
+	CMD_CONFIG,
+	SA_ADDR,
+	8,
+	8,
+	CFG8_SRDY,
+	CFG9_PREAMB8 | CFG9_ADDRLENBUF | CFG9_ADDRLEN(6),
+	0,
+	0x60,
+	0,
+	CFG13_RETRY(15) | CFG13_SLOTH(2),
+	0,
+};
+
+/* at 0x0000 */
+#define SCB_ADDR	(0x0000)
+#define SCB_SIZE	(0x10)
+static scb_t  init_scb  = {
+	0,
+	SCB_CMDACKRNR | SCB_CMDACKCNA | SCB_CMDACKFR | SCB_CMDACKCX,
+	CFG_ADDR,
+	RX_AREA_START,
+	0,
+	0,
+	0,
+	0
+};
+
+/* at 0xffee */
+#define ISCP_ADDR	(0xffee)
+#define ISCP_SIZE	(0x08)
+static iscp_t init_iscp = {
+	1,
+	SCB_ADDR,
+	0x0000,
+	0x0000
+};
+
+/* at 0xfff6 */
+#define SCP_ADDR	(0xfff6)
+#define SCP_SIZE	(0x0a)
+static scp_t  init_scp  = {
+	SCP_SY_16BBUS,
+	{ 0, 0 },
+	ISCP_ADDR,
+	0
+};
+
+#define RFD_SIZE	(0x16)
+static rfd_t  init_rfd	= {
+	0,
+	0,
+	0,
+	0,
+	{ 0, },
+	{ 0, },
+	0
+};
+
+#define RBD_SIZE	(0x0a)
+static rbd_t  init_rbd	= {
+	0,
+	0,
+	0,
+	0,
+	ETH_FRAME_LEN + 8
+};
+
+#define TX_SIZE		(0x08)
+#define TBD_SIZE	(0x08)
+
+static int
+ether1_init_for_open (struct net_device *dev)
+{
+	int i, status, addr, next, next2;
+	int failures = 0;
+	unsigned long timeout;
+
+	writeb(CTRL_RST|CTRL_ACK, REG_CONTROL);
+
+	for (i = 0; i < 6; i++)
+		init_sa.sa_addr[i] = dev->dev_addr[i];
+
+	/* load data structures into ether1 RAM */
+	ether1_writebuffer (dev, &init_scp,  SCP_ADDR,  SCP_SIZE);
+	ether1_writebuffer (dev, &init_iscp, ISCP_ADDR, ISCP_SIZE);
+	ether1_writebuffer (dev, &init_scb,  SCB_ADDR,  SCB_SIZE);
+	ether1_writebuffer (dev, &init_cfg,  CFG_ADDR,  CFG_SIZE);
+	ether1_writebuffer (dev, &init_sa,   SA_ADDR,   SA_SIZE);
+	ether1_writebuffer (dev, &init_mc,   MC_ADDR,   MC_SIZE);
+	ether1_writebuffer (dev, &init_tdr,  TDR_ADDR,  TDR_SIZE);
+	ether1_writebuffer (dev, &init_nop,  NOP_ADDR,  NOP_SIZE);
+
+	if (ether1_readw(dev, CFG_ADDR, cfg_t, cfg_command, NORMALIRQS) != CMD_CONFIG) {
+		printk (KERN_ERR "%s: detected either RAM fault or compiler bug\n",
+			dev->name);
+		return 1;
+	}
+
+	/*
+	 * setup circularly linked list of { rfd, rbd, buffer }, with
+	 * all rfds circularly linked, rbds circularly linked.
+	 * First rfd is linked to scp, first rbd is linked to first
+	 * rfd.  Last rbd has a suspend command.
+	 */
+	addr = RX_AREA_START;
+	do {
+		next = addr + RFD_SIZE + RBD_SIZE + ETH_FRAME_LEN + 10;
+		next2 = next + RFD_SIZE + RBD_SIZE + ETH_FRAME_LEN + 10;
+
+		if (next2 >= RX_AREA_END) {
+			next = RX_AREA_START;
+			init_rfd.rfd_command = RFD_CMDEL | RFD_CMDSUSPEND;
+			priv(dev)->rx_tail = addr;
+		} else
+			init_rfd.rfd_command = 0;
+		if (addr == RX_AREA_START)
+			init_rfd.rfd_rbdoffset = addr + RFD_SIZE;
+		else
+			init_rfd.rfd_rbdoffset = 0;
+		init_rfd.rfd_link = next;
+		init_rbd.rbd_link = next + RFD_SIZE;
+		init_rbd.rbd_bufl = addr + RFD_SIZE + RBD_SIZE;
+
+		ether1_writebuffer (dev, &init_rfd, addr, RFD_SIZE);
+		ether1_writebuffer (dev, &init_rbd, addr + RFD_SIZE, RBD_SIZE);
+		addr = next;
+	} while (next2 < RX_AREA_END);
+
+	priv(dev)->tx_link = NOP_ADDR;
+	priv(dev)->tx_head = NOP_ADDR + NOP_SIZE;
+	priv(dev)->tx_tail = TDR_ADDR;
+	priv(dev)->rx_head = RX_AREA_START;
+
+	/* release reset & give 586 a prod */
+	priv(dev)->resetting = 1;
+	priv(dev)->initialising = 1;
+	writeb(CTRL_RST, REG_CONTROL);
+	writeb(0, REG_CONTROL);
+	writeb(CTRL_CA, REG_CONTROL);
+
+	/* 586 should now unset iscp.busy */
+	timeout = jiffies + HZ/2;
+	while (ether1_readw(dev, ISCP_ADDR, iscp_t, iscp_busy, DISABLEIRQS) == 1) {
+		if (time_after(jiffies, timeout)) {
+			printk (KERN_WARNING "%s: can't initialise 82586: iscp is busy\n", dev->name);
+			return 1;
+		}
+	}
+
+	/* check status of commands that we issued */
+	timeout += HZ/10;
+	while (((status = ether1_readw(dev, CFG_ADDR, cfg_t, cfg_status, DISABLEIRQS))
+			& STAT_COMPLETE) == 0) {
+		if (time_after(jiffies, timeout))
+			break;
+	}
+
+	if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
+		printk (KERN_WARNING "%s: can't initialise 82586: config status %04X\n", dev->name, status);
+		printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
+			ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
+			ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
+			ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
+			ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
+		failures += 1;
+	}
+
+	timeout += HZ/10;
+	while (((status = ether1_readw(dev, SA_ADDR, sa_t, sa_status, DISABLEIRQS))
+			& STAT_COMPLETE) == 0) {
+		if (time_after(jiffies, timeout))
+			break;
+	}
+
+	if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
+		printk (KERN_WARNING "%s: can't initialise 82586: set address status %04X\n", dev->name, status);
+		printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
+			ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
+			ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
+			ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
+			ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
+		failures += 1;
+	}
+
+	timeout += HZ/10;
+	while (((status = ether1_readw(dev, MC_ADDR, mc_t, mc_status, DISABLEIRQS))
+			& STAT_COMPLETE) == 0) {
+		if (time_after(jiffies, timeout))
+			break;
+	}
+
+	if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
+		printk (KERN_WARNING "%s: can't initialise 82586: set multicast status %04X\n", dev->name, status);
+		printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
+			ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
+			ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
+			ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
+			ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
+		failures += 1;
+	}
+
+	timeout += HZ;
+	while (((status = ether1_readw(dev, TDR_ADDR, tdr_t, tdr_status, DISABLEIRQS))
+			& STAT_COMPLETE) == 0) {
+		if (time_after(jiffies, timeout))
+			break;
+	}
+
+	if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
+		printk (KERN_WARNING "%s: can't tdr (ignored)\n", dev->name);
+		printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
+			ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
+			ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
+			ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
+			ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
+	} else {
+		status = ether1_readw(dev, TDR_ADDR, tdr_t, tdr_result, DISABLEIRQS);
+		if (status & TDR_XCVRPROB)
+			printk (KERN_WARNING "%s: i/f failed tdr: transceiver problem\n", dev->name);
+		else if ((status & (TDR_SHORT|TDR_OPEN)) && (status & TDR_TIME)) {
+#ifdef FANCY
+			printk (KERN_WARNING "%s: i/f failed tdr: cable %s %d.%d us away\n", dev->name,
+				status & TDR_SHORT ? "short" : "open", (status & TDR_TIME) / 10,
+				(status & TDR_TIME) % 10);
+#else
+			printk (KERN_WARNING "%s: i/f failed tdr: cable %s %d clks away\n", dev->name,
+				status & TDR_SHORT ? "short" : "open", (status & TDR_TIME));
+#endif
+		}
+	}
+
+	if (failures)
+		ether1_reset (dev);
+	return failures ? 1 : 0;
+}
+
+/* ------------------------------------------------------------------------- */
+
+static int
+ether1_txalloc (struct net_device *dev, int size)
+{
+	int start, tail;
+
+	size = (size + 1) & ~1;
+	tail = priv(dev)->tx_tail;
+
+	if (priv(dev)->tx_head + size > TX_AREA_END) {
+		if (tail > priv(dev)->tx_head)
+			return -1;
+		start = TX_AREA_START;
+		if (start + size > tail)
+			return -1;
+		priv(dev)->tx_head = start + size;
+	} else {
+		if (priv(dev)->tx_head < tail && (priv(dev)->tx_head + size) > tail)
+			return -1;
+		start = priv(dev)->tx_head;
+		priv(dev)->tx_head += size;
+	}
+
+	return start;
+}
+
+static int
+ether1_open (struct net_device *dev)
+{
+	if (!is_valid_ether_addr(dev->dev_addr)) {
+		printk(KERN_WARNING "%s: invalid ethernet MAC address\n",
+			dev->name);
+		return -EINVAL;
+	}
+
+	if (request_irq(dev->irq, ether1_interrupt, 0, "ether1", dev))
+		return -EAGAIN;
+
+	memset (&priv(dev)->stats, 0, sizeof (struct net_device_stats));
+
+	if (ether1_init_for_open (dev)) {
+		free_irq (dev->irq, dev);
+		return -EAGAIN;
+	}
+
+	netif_start_queue(dev);
+
+	return 0;
+}
+
+static void
+ether1_timeout(struct net_device *dev)
+{
+	printk(KERN_WARNING "%s: transmit timeout, network cable problem?\n",
+		dev->name);
+	printk(KERN_WARNING "%s: resetting device\n", dev->name);
+
+	ether1_reset (dev);
+
+	if (ether1_init_for_open (dev))
+		printk (KERN_ERR "%s: unable to restart interface\n", dev->name);
+
+	priv(dev)->stats.tx_errors++;
+	netif_wake_queue(dev);
+}
+
+static int
+ether1_sendpacket (struct sk_buff *skb, struct net_device *dev)
+{
+	int tmp, tst, nopaddr, txaddr, tbdaddr, dataddr;
+	unsigned long flags;
+	tx_t tx;
+	tbd_t tbd;
+	nop_t nop;
+
+	if (priv(dev)->restart) {
+		printk(KERN_WARNING "%s: resetting device\n", dev->name);
+
+		ether1_reset(dev);
+
+		if (ether1_init_for_open(dev))
+			printk(KERN_ERR "%s: unable to restart interface\n", dev->name);
+		else
+			priv(dev)->restart = 0;
+	}
+
+	if (skb->len < ETH_ZLEN) {
+		skb = skb_padto(skb, ETH_ZLEN);
+		if (skb == NULL)
+			goto out;
+	}
+
+	/*
+	 * insert packet followed by a nop
+	 */
+	txaddr = ether1_txalloc (dev, TX_SIZE);
+	tbdaddr = ether1_txalloc (dev, TBD_SIZE);
+	dataddr = ether1_txalloc (dev, skb->len);
+	nopaddr = ether1_txalloc (dev, NOP_SIZE);
+
+	tx.tx_status = 0;
+	tx.tx_command = CMD_TX | CMD_INTR;
+	tx.tx_link = nopaddr;
+	tx.tx_tbdoffset = tbdaddr;
+	tbd.tbd_opts = TBD_EOL | skb->len;
+	tbd.tbd_link = I82586_NULL;
+	tbd.tbd_bufl = dataddr;
+	tbd.tbd_bufh = 0;
+	nop.nop_status = 0;
+	nop.nop_command = CMD_NOP;
+	nop.nop_link = nopaddr;
+
+	local_irq_save(flags);
+	ether1_writebuffer (dev, &tx, txaddr, TX_SIZE);
+	ether1_writebuffer (dev, &tbd, tbdaddr, TBD_SIZE);
+	ether1_writebuffer (dev, skb->data, dataddr, skb->len);
+	ether1_writebuffer (dev, &nop, nopaddr, NOP_SIZE);
+	tmp = priv(dev)->tx_link;
+	priv(dev)->tx_link = nopaddr;
+
+	/* now reset the previous nop pointer */
+	ether1_writew(dev, txaddr, tmp, nop_t, nop_link, NORMALIRQS);
+
+	local_irq_restore(flags);
+
+	/* handle transmit */
+	dev->trans_start = jiffies;
+
+	/* check to see if we have room for a full sized ether frame */
+	tmp = priv(dev)->tx_head;
+	tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);
+	priv(dev)->tx_head = tmp;
+	dev_kfree_skb (skb);
+
+	if (tst == -1)
+		netif_stop_queue(dev);
+
+ out:
+	return 0;
+}
+
+static void
+ether1_xmit_done (struct net_device *dev)
+{
+	nop_t nop;
+	int caddr, tst;
+
+	caddr = priv(dev)->tx_tail;
+
+again:
+	ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
+
+	switch (nop.nop_command & CMD_MASK) {
+	case CMD_TDR:
+		/* special case */
+		if (ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS)
+				!= (unsigned short)I82586_NULL) {
+			ether1_writew(dev, SCB_CMDCUCSTART | SCB_CMDRXSTART, SCB_ADDR, scb_t,
+				    scb_command, NORMALIRQS);
+			writeb(CTRL_CA, REG_CONTROL);
+		}
+		priv(dev)->tx_tail = NOP_ADDR;
+		return;
+
+	case CMD_NOP:
+		if (nop.nop_link == caddr) {
+			if (priv(dev)->initialising == 0)
+				printk (KERN_WARNING "%s: strange command complete with no tx command!\n", dev->name);
+			else
+			        priv(dev)->initialising = 0;
+			return;
+		}
+		if (caddr == nop.nop_link)
+			return;
+		caddr = nop.nop_link;
+		goto again;
+
+	case CMD_TX:
+		if (nop.nop_status & STAT_COMPLETE)
+			break;
+		printk (KERN_ERR "%s: strange command complete without completed command\n", dev->name);
+		priv(dev)->restart = 1;
+		return;
+
+	default:
+		printk (KERN_WARNING "%s: strange command %d complete! (offset %04X)", dev->name,
+			nop.nop_command & CMD_MASK, caddr);
+		priv(dev)->restart = 1;
+		return;
+	}
+
+	while (nop.nop_status & STAT_COMPLETE) {
+		if (nop.nop_status & STAT_OK) {
+			priv(dev)->stats.tx_packets ++;
+			priv(dev)->stats.collisions += (nop.nop_status & STAT_COLLISIONS);
+		} else {
+			priv(dev)->stats.tx_errors ++;
+
+			if (nop.nop_status & STAT_COLLAFTERTX)
+				priv(dev)->stats.collisions ++;
+			if (nop.nop_status & STAT_NOCARRIER)
+				priv(dev)->stats.tx_carrier_errors ++;
+			if (nop.nop_status & STAT_TXLOSTCTS)
+				printk (KERN_WARNING "%s: cts lost\n", dev->name);
+			if (nop.nop_status & STAT_TXSLOWDMA)
+				priv(dev)->stats.tx_fifo_errors ++;
+			if (nop.nop_status & STAT_COLLEXCESSIVE)
+				priv(dev)->stats.collisions += 16;
+		}
+
+		if (nop.nop_link == caddr) {
+			printk (KERN_ERR "%s: tx buffer chaining error: tx command points to itself\n", dev->name);
+			break;
+		}
+
+		caddr = nop.nop_link;
+		ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
+		if ((nop.nop_command & CMD_MASK) != CMD_NOP) {
+			printk (KERN_ERR "%s: tx buffer chaining error: no nop after tx command\n", dev->name);
+			break;
+		}
+
+		if (caddr == nop.nop_link)
+			break;
+
+		caddr = nop.nop_link;
+		ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
+		if ((nop.nop_command & CMD_MASK) != CMD_TX) {
+			printk (KERN_ERR "%s: tx buffer chaining error: no tx command after nop\n", dev->name);
+			break;
+		}
+	}
+	priv(dev)->tx_tail = caddr;
+
+	caddr = priv(dev)->tx_head;
+	tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);
+	priv(dev)->tx_head = caddr;
+	if (tst != -1)
+		netif_wake_queue(dev);
+}
+
+static void
+ether1_recv_done (struct net_device *dev)
+{
+	int status;
+	int nexttail, rbdaddr;
+	rbd_t rbd;
+
+	do {
+		status = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_status, NORMALIRQS);
+		if ((status & RFD_COMPLETE) == 0)
+			break;
+
+		rbdaddr = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_rbdoffset, NORMALIRQS);
+		ether1_readbuffer (dev, &rbd, rbdaddr, RBD_SIZE);
+
+		if ((rbd.rbd_status & (RBD_EOF | RBD_ACNTVALID)) == (RBD_EOF | RBD_ACNTVALID)) {
+			int length = rbd.rbd_status & RBD_ACNT;
+			struct sk_buff *skb;
+
+			length = (length + 1) & ~1;
+			skb = dev_alloc_skb (length + 2);
+
+			if (skb) {
+				skb->dev = dev;
+				skb_reserve (skb, 2);
+
+				ether1_readbuffer (dev, skb_put (skb, length), rbd.rbd_bufl, length);
+
+				skb->protocol = eth_type_trans (skb, dev);
+				netif_rx (skb);
+				priv(dev)->stats.rx_packets ++;
+			} else
+				priv(dev)->stats.rx_dropped ++;
+		} else {
+			printk(KERN_WARNING "%s: %s\n", dev->name,
+				(rbd.rbd_status & RBD_EOF) ? "oversized packet" : "acnt not valid");
+			priv(dev)->stats.rx_dropped ++;
+		}
+
+		nexttail = ether1_readw(dev, priv(dev)->rx_tail, rfd_t, rfd_link, NORMALIRQS);
+		/* nexttail should be rx_head */
+		if (nexttail != priv(dev)->rx_head)
+			printk(KERN_ERR "%s: receiver buffer chaining error (%04X != %04X)\n",
+				dev->name, nexttail, priv(dev)->rx_head);
+		ether1_writew(dev, RFD_CMDEL | RFD_CMDSUSPEND, nexttail, rfd_t, rfd_command, NORMALIRQS);
+		ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_command, NORMALIRQS);
+		ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_status, NORMALIRQS);
+		ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_rbdoffset, NORMALIRQS);
+	
+		priv(dev)->rx_tail = nexttail;
+		priv(dev)->rx_head = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_link, NORMALIRQS);
+	} while (1);
+}
+
+static irqreturn_t
+ether1_interrupt (int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *dev = (struct net_device *)dev_id;
+	int status;
+
+	status = ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS);
+
+	if (status) {
+		ether1_writew(dev, status & (SCB_STRNR | SCB_STCNA | SCB_STFR | SCB_STCX),
+			    SCB_ADDR, scb_t, scb_command, NORMALIRQS);
+		writeb(CTRL_CA | CTRL_ACK, REG_CONTROL);
+		if (status & SCB_STCX) {
+			ether1_xmit_done (dev);
+		}
+		if (status & SCB_STCNA) {
+			if (priv(dev)->resetting == 0)
+				printk (KERN_WARNING "%s: CU went not ready ???\n", dev->name);
+			else
+				priv(dev)->resetting += 1;
+			if (ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS)
+					!= (unsigned short)I82586_NULL) {
+				ether1_writew(dev, SCB_CMDCUCSTART, SCB_ADDR, scb_t, scb_command, NORMALIRQS);
+				writeb(CTRL_CA, REG_CONTROL);
+			}
+			if (priv(dev)->resetting == 2)
+				priv(dev)->resetting = 0;
+		}
+		if (status & SCB_STFR) {
+			ether1_recv_done (dev);
+		}
+		if (status & SCB_STRNR) {
+			if (ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS) & SCB_STRXSUSP) {
+				printk (KERN_WARNING "%s: RU went not ready: RU suspended\n", dev->name);
+				ether1_writew(dev, SCB_CMDRXRESUME, SCB_ADDR, scb_t, scb_command, NORMALIRQS);
+				writeb(CTRL_CA, REG_CONTROL);
+				priv(dev)->stats.rx_dropped ++;	/* we suspended due to lack of buffer space */
+			} else
+				printk(KERN_WARNING "%s: RU went not ready: %04X\n", dev->name,
+					ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS));
+			printk (KERN_WARNING "RU ptr = %04X\n", ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset,
+						NORMALIRQS));
+		}
+	} else
+		writeb(CTRL_ACK, REG_CONTROL);
+
+	return IRQ_HANDLED;
+}
+
+static int
+ether1_close (struct net_device *dev)
+{
+	ether1_reset (dev);
+
+	free_irq(dev->irq, dev);
+
+	return 0;
+}
+
+static struct net_device_stats *
+ether1_getstats (struct net_device *dev)
+{
+	return &priv(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
+ether1_setmulticastlist (struct net_device *dev)
+{
+}
+
+/* ------------------------------------------------------------------------- */
+
+static void __init ether1_banner(void)
+{
+	static unsigned int version_printed = 0;
+
+	if (net_debug && version_printed++ == 0)
+		printk(KERN_INFO "%s", version);
+}
+
+static int __devinit
+ether1_probe(struct expansion_card *ec, const struct ecard_id *id)
+{
+	struct net_device *dev;
+	int i, ret = 0;
+
+	ether1_banner();
+
+	ret = ecard_request_resources(ec);
+	if (ret)
+		goto out;
+
+	dev = alloc_etherdev(sizeof(struct ether1_priv));
+	if (!dev) {
+		ret = -ENOMEM;
+		goto release;
+	}
+
+	SET_MODULE_OWNER(dev);
+	SET_NETDEV_DEV(dev, &ec->dev);
+
+	dev->irq = ec->irq;
+	priv(dev)->base = ioremap(ecard_resource_start(ec, ECARD_RES_IOCFAST),
+				  ecard_resource_len(ec, ECARD_RES_IOCFAST));
+	if (!priv(dev)->base) {
+		ret = -ENOMEM;
+		goto free;
+	}
+
+	if ((priv(dev)->bus_type = ether1_reset(dev)) == 0) {
+		ret = -ENODEV;
+		goto free;
+	}
+
+	for (i = 0; i < 6; i++)
+		dev->dev_addr[i] = readb(IDPROM_ADDRESS + (i << 2));
+
+	if (ether1_init_2(dev)) {
+		ret = -ENODEV;
+		goto free;
+	}
+
+	dev->open		= ether1_open;
+	dev->stop		= ether1_close;
+	dev->hard_start_xmit    = ether1_sendpacket;
+	dev->get_stats		= ether1_getstats;
+	dev->set_multicast_list = ether1_setmulticastlist;
+	dev->tx_timeout		= ether1_timeout;
+	dev->watchdog_timeo	= 5 * HZ / 100;
+
+	ret = register_netdev(dev);
+	if (ret)
+		goto free;
+
+	printk(KERN_INFO "%s: ether1 in slot %d, ",
+		dev->name, ec->slot_no);
+    
+	for (i = 0; i < 6; i++)
+		printk ("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
+
+	ecard_set_drvdata(ec, dev);
+	return 0;
+
+ free:
+	if (priv(dev)->base)
+		iounmap(priv(dev)->base);
+	free_netdev(dev);
+ release:
+	ecard_release_resources(ec);
+ out:
+	return ret;
+}
+
+static void __devexit ether1_remove(struct expansion_card *ec)
+{
+	struct net_device *dev = ecard_get_drvdata(ec);
+
+	ecard_set_drvdata(ec, NULL);	
+
+	unregister_netdev(dev);
+	iounmap(priv(dev)->base);
+	free_netdev(dev);
+	ecard_release_resources(ec);
+}
+
+static const struct ecard_id ether1_ids[] = {
+	{ MANU_ACORN, PROD_ACORN_ETHER1 },
+	{ 0xffff, 0xffff }
+};
+
+static struct ecard_driver ether1_driver = {
+	.probe		= ether1_probe,
+	.remove		= __devexit_p(ether1_remove),
+	.id_table	= ether1_ids,
+	.drv = {
+		.name	= "ether1",
+	},
+};
+
+static int __init ether1_init(void)
+{
+	return ecard_register_driver(&ether1_driver);
+}
+
+static void __exit ether1_exit(void)
+{
+	ecard_remove_driver(&ether1_driver);
+}
+
+module_init(ether1_init);
+module_exit(ether1_exit);
+
+MODULE_LICENSE("GPL");