patch-2.1.88 linux/drivers/acorn/net/ether1.c

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diff -u --recursive --new-file v2.1.87/linux/drivers/acorn/net/ether1.c linux/drivers/acorn/net/ether1.c
@@ -0,0 +1,1241 @@
+/*
+ * linux/arch/arm/drivers/net/ether1.c
+ *
+ * (C) Copyright 1996,1997,1998 Russell King
+ *
+ * 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
+ */
+
+#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/malloc.h>
+#include <linux/string.h>
+#include <asm/system.h>
+#include <asm/bitops.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <linux/errno.h>
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+
+#include <asm/ecard.h>
+
+#define __ETHER1_C
+#include "ether1.h"
+
+static unsigned int net_debug = NET_DEBUG;
+
+#define 	struct ether1_priv *priv = (struct ether1_priv *)dev->priv \
+	struct ether1_priv *priv = (struct ether1_priv *)dev->priv
+
+#define BUFFER_SIZE	0x10000
+#define TX_AREA_START	0x00100
+#define TX_AREA_END	0x05000
+#define RX_AREA_START	0x05000
+#define RX_AREA_END	0x0fc00
+
+#define tx_done(dev) 0
+/* ------------------------------------------------------------------------- */
+static char *version = "ether1 ethernet driver (c) 1995 Russell King v1.05\n";
+
+#define BUS_16 16
+#define BUS_8  8
+
+static const card_ids ether1_cids[] = {
+	{ MANU_ACORN, PROD_ACORN_ETHER1 },
+	{ 0xffff, 0xffff }
+};
+
+/* ------------------------------------------------------------------------- */
+
+#define DISABLEIRQS 1
+#define NORMALIRQS  0
+
+#define ether1_inw(dev, addr, type, offset, svflgs) ether1_inw_p (dev, addr + (int)(&((type *)0)->offset), svflgs)
+#define ether1_outw(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 device *dev, int addr, int svflgs)
+{
+	unsigned long flags;
+	unsigned short ret;
+
+	if (svflgs) {
+		save_flags_cli (flags);
+	}
+	outb (addr >> 12, REG_PAGE);
+	ret = inw (ETHER1_RAM + ((addr & 4095) >> 1));
+	if (svflgs)
+		restore_flags (flags);
+	return ret;
+}
+
+static inline void ether1_outw_p (struct device *dev, unsigned short val, int addr, int svflgs)
+{
+	unsigned long flags;
+
+	if (svflgs) {
+		save_flags_cli (flags);
+	}
+	outb (addr >> 12, REG_PAGE);
+	outw (val, ETHER1_RAM + ((addr & 4095) >> 1));
+	if (svflgs)
+		restore_flags (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 inline void *ether1_inswb (unsigned int addr, void *data, unsigned int len)
+{
+	int used;
+
+	addr = IO_BASE + (addr << 2);
+
+	__asm__ __volatile__(
+		"subs	%3, %3, #2
+		bmi	2f
+1:		ldr	%0, [%1], #4
+		strb	%0, [%2], #1
+		mov	%0, %0, lsr #8
+		strb	%0, [%2], #1
+		subs	%3, %3, #2
+		bmi	2f
+		ldr	%0, [%1], #4
+		strb	%0, [%2], #1
+		mov	%0, %0, lsr #8
+		strb	%0, [%2], #1
+		subs	%3, %3, #2
+		bmi	2f
+		ldr	%0, [%1], #4
+		strb	%0, [%2], #1
+		mov	%0, %0, lsr #8
+		strb	%0, [%2], #1
+		subs	%3, %3, #2
+		bmi	2f
+		ldr	%0, [%1], #4
+		strb	%0, [%2], #1
+		mov	%0, %0, lsr #8
+		strb	%0, [%2], #1
+		subs	%3, %3, #2
+		bpl	1b
+2:		adds	%3, %3, #1
+		ldreqb	%0, [%1]
+		streqb	%0, [%2]"
+		: "=&r" (used), "=&r" (addr), "=&r" (data), "=&r" (len)
+		:                "1"  (addr), "2"   (data), "3"   (len));
+
+	return data;
+}
+
+static inline void *ether1_outswb (unsigned int addr, void *data, unsigned int len)
+{
+	int used;
+
+	addr = IO_BASE + (addr << 2);
+
+	__asm__ __volatile__(
+		"subs	%3, %3, #2
+		bmi	2f
+1:		ldr	%0, [%2], #2
+		mov	%0, %0, lsl #16
+		orr	%0, %0, %0, lsr #16
+		str	%0, [%1], #4
+		subs	%3, %3, #2
+		bmi	2f
+		ldr	%0, [%2], #2
+		mov	%0, %0, lsl #16
+		orr	%0, %0, %0, lsr #16
+		str	%0, [%1], #4
+		subs	%3, %3, #2
+		bmi	2f
+		ldr	%0, [%2], #2
+		mov	%0, %0, lsl #16
+		orr	%0, %0, %0, lsr #16
+		str	%0, [%1], #4
+		subs	%3, %3, #2
+		bmi	2f
+		ldr	%0, [%2], #2
+		mov	%0, %0, lsl #16
+		orr	%0, %0, %0, lsr #16
+		str	%0, [%1], #4
+		subs	%3, %3, #2
+		bpl	1b
+2:		adds	%3, %3, #1
+		ldreqb	%0, [%2]
+		streqb	%0, [%1]"
+		: "=&r" (used), "=&r" (addr), "=&r" (data), "=&r" (len)
+		:                "1"  (addr), "2"   (data), "3"   (len));
+
+	return data;
+}
+
+
+static void ether1_writebuffer (struct device *dev, void *data, unsigned int start, unsigned int length)
+{
+	unsigned int page, thislen, offset;
+	offset = start & 4095;
+
+	for (page = start >> 12; length; page++) 
+	{
+		outb (page, REG_PAGE);
+		if (offset + length > 4096) 
+		{
+		    length -= 4096 - offset;
+		    thislen = 4096 - offset;
+		}
+		else
+		{
+			thislen = length;
+			length = 0;
+		}
+
+		data = ether1_outswb (ETHER1_RAM + (offset >> 1), data, thislen);
+		offset = 0;
+	}
+}
+
+static void ether1_readbuffer (struct device *dev, void *data, unsigned int start, unsigned int length)
+{
+	unsigned int page, thislen, offset;
+
+	offset = start & 4095;
+
+	for (page = start >> 12; length; page++) 
+	{
+		outb (page, REG_PAGE);
+		if (offset + length > 4096) 
+		{
+			length -= 4096 - offset;
+			thislen = 4096 - offset;
+		}
+		else
+		{
+	 		thislen = length;
+			length = 0;
+		}
+
+		data = ether1_inswb (ETHER1_RAM + (offset >> 1), data, thislen);
+		offset = 0;
+	}
+}
+
+static int ether1_ramtest (struct 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 device *dev)
+{
+	outb (CTRL_RST|CTRL_ACK, REG_CONTROL);
+	return BUS_16;
+}
+
+static int ether1_init_2 (struct 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 device *dev)
+{
+	struct ether1_priv *priv = (struct ether1_priv *)dev->priv;
+	int i, status, addr, next, next2;
+	int failures = 0;
+
+	outb (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_inw (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->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->tx_link = NOP_ADDR;
+	priv->tx_head = NOP_ADDR + NOP_SIZE;
+	priv->tx_tail = TDR_ADDR;
+	priv->rx_head = RX_AREA_START;
+
+	/* release reset & give 586 a prod */
+	priv->resetting = 1;
+	priv->initialising = 1;
+	outb (CTRL_RST, REG_CONTROL);
+	outb (0, REG_CONTROL);
+	outb (CTRL_CA, REG_CONTROL);
+
+	/* 586 should now unset iscp.busy */
+	i = jiffies + HZ/2;
+	while (ether1_inw (dev, ISCP_ADDR, iscp_t, iscp_busy, DISABLEIRQS) == 1) 
+	{
+		if (jiffies > i) 
+		{
+			printk (KERN_WARNING "%s: can't initialise 82586: iscp is busy\n", dev->name);
+			return 1;
+		}
+	}
+
+	/* check status of commands that we issued */
+	i += HZ/10;
+	while (((status = ether1_inw (dev, CFG_ADDR, cfg_t, cfg_status, DISABLEIRQS)) & STAT_COMPLETE) == 0) 
+	{
+		if (jiffies-i<0)
+			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_inw (dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
+		ether1_inw (dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
+		ether1_inw (dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
+		ether1_inw (dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
+		failures += 1;
+	}
+
+	i += HZ/10;
+	while (((status = ether1_inw (dev, SA_ADDR, sa_t, sa_status, DISABLEIRQS)) & STAT_COMPLETE) == 0) 
+	{
+		if (jiffies-i<0)
+			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_inw (dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
+			ether1_inw (dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
+			ether1_inw (dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
+			ether1_inw (dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
+		failures += 1;
+	}
+
+	i += HZ/10;
+	while (((status = ether1_inw (dev, MC_ADDR, mc_t, mc_status, DISABLEIRQS)) & STAT_COMPLETE) == 0) 
+	{
+		if (jiffies-i < 0)
+			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_inw (dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
+			ether1_inw (dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
+			ether1_inw (dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
+			ether1_inw (dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
+		failures += 1;
+	}
+
+	i += HZ;
+	while (((status = ether1_inw (dev, TDR_ADDR, tdr_t, tdr_status, DISABLEIRQS)) & STAT_COMPLETE) == 0) 
+	{
+		if (jiffies-i <0)
+			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_inw (dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
+			ether1_inw (dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
+			ether1_inw (dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
+			ether1_inw (dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
+	}
+	else 
+	{
+		status = ether1_inw (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_probe1 (struct device *dev)
+{
+	static unsigned int version_printed = 0;
+	struct ether1_priv *priv;
+	int i;
+
+	if (!dev->priv)
+		dev->priv = kmalloc (sizeof (struct ether1_priv), GFP_KERNEL);
+
+	if (!dev->priv)
+    		return 1;
+
+	priv = (struct ether1_priv *)dev->priv;
+	memset (priv, 0, sizeof (struct ether1_priv));
+
+	if ((priv->bus_type = ether1_reset (dev)) == 0) 
+	{
+		kfree (dev->priv);
+		return 1;
+	}
+
+	if (net_debug && version_printed++ == 0)
+		printk (KERN_INFO "%s", version);
+
+	printk (KERN_INFO "%s: ether1 found [%d, %04lx, %d]", dev->name, priv->bus_type,
+		dev->base_addr, dev->irq);
+
+	request_region (dev->base_addr, 16, "ether1");
+	request_region (dev->base_addr + 0x800, 4096, "ether1(ram)");
+
+	for (i = 0; i < 6; i++)
+		printk (i==0?" %02x":i==5?":%02x\n":":%02x", dev->dev_addr[i]);
+
+	if (ether1_init_2 (dev)) 
+	{
+		kfree (dev->priv);
+		return 1;
+	}
+
+	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;
+
+	/* Fill in the fields of the device structure with ethernet values */
+	ether_setup (dev);
+
+#ifndef CLAIM_IRQ_AT_OPEN
+	if (request_irq (dev->irq, ether1_interrupt, 0, "ether1", dev)) 
+	{
+		kfree (dev->priv);
+		return -EAGAIN;
+	}
+#endif
+	return 0;
+}	
+    
+/* ------------------------------------------------------------------------- */
+
+static void ether1_addr (struct device *dev)
+{
+	int i;
+    
+	for (i = 0; i < 6; i++)
+		dev->dev_addr[i] = inb (IDPROM_ADDRESS + i);
+}
+
+int ether1_probe (struct device *dev)
+{
+#ifndef MODULE
+	struct expansion_card *ec;
+
+	if (!dev)
+		return ENODEV;
+
+	ecard_startfind ();
+	if ((ec = ecard_find (0, ether1_cids)) == NULL)
+		return ENODEV;
+
+	dev->base_addr = ecard_address (ec, ECARD_IOC, ECARD_FAST);
+	dev->irq       = ec->irq;
+
+	ecard_claim (ec);
+#endif
+	ether1_addr (dev);
+
+	if (ether1_probe1 (dev) == 0)
+		return 0;
+	return ENODEV;
+}
+
+/* ------------------------------------------------------------------------- */
+
+static int ether1_txalloc (struct device *dev, int size)
+{
+    	struct ether1_priv *priv = (struct ether1_priv *)dev->priv;
+	int start, tail;
+
+	size = (size + 1) & ~1;
+	tail = priv->tx_tail;
+
+	if (priv->tx_head + size > TX_AREA_END) 
+	{
+		if (tail > priv->tx_head)
+			return -1;
+		start = TX_AREA_START;
+		if (start + size > tail)
+			return -1;
+		priv->tx_head = start + size;
+	}
+	else
+	{
+		if (priv->tx_head < tail && (priv->tx_head + size) > tail)
+			return -1;
+		start = priv->tx_head;
+		priv->tx_head += size;
+	}
+	return start;
+}
+
+static void ether1_restart (struct device *dev, char *reason)
+{
+    	struct ether1_priv *priv = (struct ether1_priv *)dev->priv;
+	priv->stats.tx_errors ++;
+
+	if (reason)
+		printk (KERN_WARNING "%s: %s - resetting device\n", dev->name, reason);
+	else
+		printk (" - resetting device\n");
+
+	ether1_reset (dev);
+
+	dev->start = 0;
+	dev->tbusy = 0;
+
+	if (ether1_init_for_open (dev))
+		printk (KERN_ERR "%s: unable to restart interface\n", dev->name);
+
+	dev->start = 1;
+}
+
+static int ether1_open (struct device *dev)
+{
+    	struct ether1_priv *priv = (struct ether1_priv *)dev->priv;
+#ifdef CLAIM_IRQ_AT_OPEN
+	if (request_irq (dev->irq, ether1_interrupt, 0, "ether1", dev))
+		return -EAGAIN;
+#endif
+	MOD_INC_USE_COUNT;
+
+	memset (&priv->stats, 0, sizeof (struct enet_statistics));
+
+	if (ether1_init_for_open (dev)) 
+	{
+#ifdef CLAIM_IRQ_AT_OPEN
+		free_irq (dev->irq, dev);
+#endif
+		MOD_DEC_USE_COUNT;
+		return -EAGAIN;
+	}
+
+	dev->tbusy = 0;
+	dev->interrupt = 0;
+	dev->start = 1;
+
+	return 0;
+}
+
+static int ether1_sendpacket (struct sk_buff *skb, struct device *dev)
+{
+    	struct ether1_priv *priv = (struct ether1_priv *)dev->priv;
+
+	if (priv->restart)
+		ether1_restart (dev, NULL);
+
+	if (dev->tbusy) 
+	{
+		/*
+		 * If we get here, some higher level has decided that we are broken.
+		 * There should really be a "kick me" function call instead.
+		 */
+		int tickssofar = jiffies - dev->trans_start;
+
+		if (tickssofar < 5)
+			return 1;
+
+		/* Try to restart the adapter. */
+		ether1_restart (dev, "transmit timeout, network cable problem?");
+		dev->trans_start = jiffies;
+	}
+
+	/*
+	 * Block a timer-based transmit from overlapping.  This could better be
+	 * done with atomic_swap(1, dev->tbusy), but set_bit() works as well.
+	 */
+	 
+	if (test_and_set_bit (0, (void *)&dev->tbusy) != 0)
+		printk (KERN_WARNING "%s: transmitter access conflict.\n", dev->name);
+	else 
+	{
+		int len = (ETH_ZLEN < skb->len) ? skb->len : ETH_ZLEN;
+		int tmp, tst, nopaddr, txaddr, tbdaddr, dataddr;
+		unsigned long flags;
+		tx_t tx;
+		tbd_t tbd;
+		nop_t nop;
+
+		/*
+		 * insert packet followed by a nop
+		 */
+		txaddr = ether1_txalloc (dev, TX_SIZE);
+		tbdaddr = ether1_txalloc (dev, TBD_SIZE);
+		dataddr = ether1_txalloc (dev, 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 | 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;
+
+		save_flags_cli (flags);
+		ether1_writebuffer (dev, &tx, txaddr, TX_SIZE);
+		ether1_writebuffer (dev, &tbd, tbdaddr, TBD_SIZE);
+		ether1_writebuffer (dev, skb->data, dataddr, len);
+		ether1_writebuffer (dev, &nop, nopaddr, NOP_SIZE);
+		tmp = priv->tx_link;
+		priv->tx_link = nopaddr;
+
+		/* now reset the previous nop pointer */
+		ether1_outw (dev, txaddr, tmp, nop_t, nop_link, NORMALIRQS);
+
+		restore_flags (flags);
+
+		/* handle transmit */
+		dev->trans_start = jiffies;
+
+		/* check to see if we have room for a full sized ether frame */
+		tmp = priv->tx_head;
+		tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);
+		priv->tx_head = tmp;
+		if (tst != -1)
+			dev->tbusy = 0;
+	}
+	dev_kfree_skb (skb, FREE_WRITE);
+
+	return 0;
+}
+
+static void ether1_xmit_done (struct device *dev)
+{
+    	struct ether1_priv *priv = (struct ether1_priv *)dev->priv;
+	nop_t nop;
+	int caddr, tst;
+
+	caddr = priv->tx_tail;
+
+again:
+	ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
+
+	switch (nop.nop_command & CMD_MASK) 
+	{
+		case CMD_TDR:
+			/* special case */
+			if (ether1_inw (dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS) != (unsigned short)I82586_NULL) 
+			{
+				ether1_outw (dev, SCB_CMDCUCSTART | SCB_CMDRXSTART, SCB_ADDR, scb_t,
+				scb_command, NORMALIRQS);
+				outb (CTRL_CA, REG_CONTROL);
+			}
+			priv->tx_tail = NOP_ADDR;
+			return;
+
+		case CMD_NOP:
+			if (nop.nop_link == caddr)
+			{
+				if (priv->initialising == 0)
+					printk (KERN_WARNING "%s: strange command complete with no tx command!\n", dev->name);
+				else
+	        			priv->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->restart = 1;
+			return;
+
+		default:
+			printk (KERN_WARNING "%s: strange command %d complete! (offset %04X)", dev->name,
+				nop.nop_command & CMD_MASK, caddr);
+			priv->restart = 1;
+			return;
+	}
+
+	while (nop.nop_status & STAT_COMPLETE) 
+	{
+		if (nop.nop_status & STAT_OK) 
+		{
+			priv->stats.tx_packets ++;
+			priv->stats.collisions += (nop.nop_status & STAT_COLLISIONS);
+		}
+		else
+		{
+			priv->stats.tx_errors ++;
+			if (nop.nop_status & STAT_COLLAFTERTX)
+				priv->stats.collisions ++;
+			if (nop.nop_status & STAT_NOCARRIER)
+				priv->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->stats.tx_fifo_errors ++;
+			if (nop.nop_status & STAT_COLLEXCESSIVE)
+				priv->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->tx_tail = caddr;
+
+	caddr = priv->tx_head;
+	tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);
+	priv->tx_head = caddr;
+	if (tst != -1)
+		dev->tbusy = 0;
+    
+	mark_bh (NET_BH);
+}
+
+static void ether1_recv_done (struct device *dev)
+{
+    	struct ether1_priv *priv = (struct ether1_priv *)dev->priv;
+	int status;
+	int nexttail, rbdaddr;
+	rbd_t rbd;
+
+	do
+	{
+		status = ether1_inw (dev, priv->rx_head, rfd_t, rfd_status, NORMALIRQS);
+		if ((status & RFD_COMPLETE) == 0)
+			break;
+
+		rbdaddr = ether1_inw (dev, priv->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->stats.rx_packets ++;
+			}
+			else
+				priv->stats.rx_dropped ++;
+		}
+		else 
+		{
+			printk (KERN_WARNING "%s: %s\n", dev->name,
+				(rbd.rbd_status & RBD_EOF) ? "oversized packet" : "acnt not valid");
+			priv->stats.rx_dropped ++;
+		}
+
+		nexttail = ether1_inw (dev, priv->rx_tail, rfd_t, rfd_link, NORMALIRQS);
+		/* nexttail should be rx_head */
+		if (nexttail != priv->rx_head)
+			printk (KERN_ERR "%s: receiver buffer chaining error (%04X != %04X)\n",
+				dev->name, nexttail, priv->rx_head);
+		ether1_outw (dev, RFD_CMDEL | RFD_CMDSUSPEND, nexttail, rfd_t, rfd_command, NORMALIRQS);
+		ether1_outw (dev, 0, priv->rx_tail, rfd_t, rfd_command, NORMALIRQS);
+		ether1_outw (dev, 0, priv->rx_tail, rfd_t, rfd_status, NORMALIRQS);
+		ether1_outw (dev, 0, priv->rx_tail, rfd_t, rfd_rbdoffset, NORMALIRQS);
+	
+		priv->rx_tail = nexttail;
+		priv->rx_head = ether1_inw (dev, priv->rx_head, rfd_t, rfd_link, NORMALIRQS);
+	}
+	while (1);
+}
+
+static void ether1_interrupt (int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct device *dev = (struct device *)dev_id;
+    	struct ether1_priv *priv = (struct ether1_priv *)dev->priv;
+	int status;
+
+	dev->interrupt = 1;
+
+	status = ether1_inw (dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS);
+
+	if (status) 
+	{
+		ether1_outw (dev, status & (SCB_STRNR | SCB_STCNA | SCB_STFR | SCB_STCX),
+			SCB_ADDR, scb_t, scb_command, NORMALIRQS);
+		outb (CTRL_CA | CTRL_ACK, REG_CONTROL);
+		if (status & SCB_STCX)
+			ether1_xmit_done (dev);
+		if (status & SCB_STCNA) 
+		{
+			if (priv->resetting == 0)
+				printk (KERN_WARNING "%s: CU went not ready ???\n", dev->name);
+			else
+				priv->resetting += 1;
+			if (ether1_inw (dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS) != (unsigned short)I82586_NULL) 
+			{
+				ether1_outw (dev, SCB_CMDCUCSTART, SCB_ADDR, scb_t, scb_command, NORMALIRQS);
+				outb (CTRL_CA, REG_CONTROL);
+			}
+			if (priv->resetting == 2)
+				priv->resetting = 0;
+		}
+		if (status & SCB_STFR)
+			ether1_recv_done (dev);
+
+		if (status & SCB_STRNR) 
+		{
+			if (ether1_inw (dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS) & SCB_STRXSUSP) 
+			{
+				printk (KERN_WARNING "%s: RU went not ready: RU suspended\n", dev->name);
+				ether1_outw (dev, SCB_CMDRXRESUME, SCB_ADDR, scb_t, scb_command, NORMALIRQS);
+				outb (CTRL_CA, REG_CONTROL);
+				priv->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_inw (dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS));
+			printk (KERN_WARNING "RU ptr = %04X\n", ether1_inw (dev, SCB_ADDR, scb_t, scb_rfa_offset,NORMALIRQS));
+		}
+	}
+	else
+        	outb (CTRL_ACK, REG_CONTROL);
+
+	dev->interrupt = 0;
+}
+
+static int ether1_close (struct device *dev)
+{
+#ifdef CLAIM_IRQ_AT_OPEN
+	free_irq (dev->irq, dev);
+#endif
+
+	ether1_reset (dev);	
+	dev->start = 0;
+	dev->tbusy = 0;
+	MOD_DEC_USE_COUNT;
+
+	return 0;
+}
+
+static struct enet_statistics *ether1_getstats (struct device *dev)
+{
+    	struct ether1_priv *priv = (struct ether1_priv *)dev->priv;
+	return &priv->stats;
+}
+
+
+/*
+ * Set or clear the multicast filter for this adaptor.
+ * num_addrs == -1	Promiscuous mode, receive all packets.
+ * num_addrs == 0	Normal mode, clear multicast list.
+ * num_addrs > 0	Multicast mode, receive normal and MC packets, and do
+ *			best-effort filtering.
+ */
+
+static void ether1_setmulticastlist (struct device *dev)
+{
+}
+
+/* ------------------------------------------------------------------------- */
+
+#ifdef MODULE
+
+static char ethernames[MAX_ECARDS][9];
+static struct device *my_ethers[MAX_ECARDS];
+static struct expansion_card *ec[MAX_ECARDS];
+
+int init_module (void)
+{
+	int i;
+
+	for (i = 0; i < MAX_ECARDS; i++) 
+	{
+		my_ethers[i] = NULL;
+		ec[i] = NULL;
+		strcpy (ethernames[i], "        ");
+	}
+
+	i = 0;
+
+	ecard_startfind();
+
+	do 
+	{
+		if ((ec[i] = ecard_find(0, ether1_cids)) == NULL)
+			break;
+
+		my_ethers[i] = (struct device *)kmalloc (sizeof (struct device), GFP_KERNEL);
+		memset (my_ethers[i], 0, sizeof (struct device));
+
+		my_ethers[i]->irq = ec[i]->irq;
+		my_ethers[i]->base_addr = ecard_address (ec[i], ECARD_IOC, ECARD_FAST);
+		my_ethers[i]->init = ether1_probe;
+		my_ethers[i]->name = ethernames[i];
+
+		ecard_claim (ec[i]);
+
+		if (register_netdev (my_ethers[i]) != 0) 
+		{
+			for (i = 0; i < 4; i++) 
+	    		{
+				if (my_ethers[i]) 
+				{
+					kfree (my_ethers[i]);
+					my_ethers[i] = NULL;
+				}
+				if (ec[i])
+				{
+					ecard_release (ec[i]);
+					ec[i] = NULL;
+				}
+			}
+			return -EIO;
+		}
+		i++;
+	}
+	while (i < MAX_ECARDS);
+
+	return i != 0 ? 0 : -ENODEV;
+}
+
+void cleanup_module (void)
+{
+	int i;
+
+	for (i = 0; i < MAX_ECARDS; i++) 
+	{
+		if (my_ethers[i]) 
+		{
+			unregister_netdev (my_ethers[i]);
+			release_region (my_ethers[i]->base_addr, 16);
+			release_region (my_ethers[i]->base_addr + 0x800, 4096);
+#ifndef CLAIM_IRQ_AT_OPEN
+			free_irq (my_ethers[i]->irq, my_ethers[i]);
+#endif
+			my_ethers[i] = NULL;
+		}
+		if (ec[i]) 
+		{
+			ecard_release (ec[i]);
+			ec[i] = NULL;
+		}
+	}
+}
+#endif /* MODULE */

FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen, slshen@lbl.gov