Linux-2.6.12-rc2v2.6.12-rc2

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

Let it rip!

1 files changed, 1059 insertions, 0 deletions

diff --git a/drivers/net/appletalk/cops.c b/drivers/net/appletalk/cops.c
new file mode 100644
index 00000000000..2161c2d585f
--- /dev/null
+++ b/drivers/net/appletalk/cops.c
@@ -0,0 +1,1059 @@
+/*      cops.c: LocalTalk driver for Linux.
+ *
+ *	Authors:
+ *      - Jay Schulist <jschlst@samba.org>
+ *
+ *	With more than a little help from;
+ *	- Alan Cox <Alan.Cox@linux.org> 
+ *
+ *      Derived from:
+ *      - skeleton.c: A network driver outline for linux.
+ *        Written 1993-94 by Donald Becker.
+ *	- ltpc.c: A driver for the LocalTalk PC card.
+ *	  Written by Bradford W. Johnson.
+ *
+ *      Copyright 1993 United States Government as represented by the
+ *      Director, National Security Agency.
+ *
+ *      This software may be used and distributed according to the terms
+ *      of the GNU General Public License, incorporated herein by reference.
+ *
+ *	Changes:
+ *	19970608	Alan Cox	Allowed dual card type support
+ *					Can set board type in insmod
+ *					Hooks for cops_setup routine
+ *					(not yet implemented).
+ *	19971101	Jay Schulist	Fixes for multiple lt* devices.
+ *	19980607	Steven Hirsch	Fixed the badly broken support
+ *					for Tangent type cards. Only
+ *                                      tested on Daystar LT200. Some
+ *                                      cleanup of formatting and program
+ *                                      logic.  Added emacs 'local-vars'
+ *                                      setup for Jay's brace style.
+ *	20000211	Alan Cox	Cleaned up for softnet
+ */
+
+static const char *version =
+"cops.c:v0.04 6/7/98 Jay Schulist <jschlst@samba.org>\n";
+/*
+ *  Sources:
+ *      COPS Localtalk SDK. This provides almost all of the information
+ *      needed.
+ */
+
+/*
+ * insmod/modprobe configurable stuff.
+ *	- IO Port, choose one your card supports or 0 if you dare.
+ *	- IRQ, also choose one your card supports or nothing and let
+ *	  the driver figure it out.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.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/init.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/if_arp.h>
+#include <linux/if_ltalk.h>	/* For ltalk_setup() */
+#include <linux/delay.h>	/* For udelay() */
+#include <linux/atalk.h>
+#include <linux/spinlock.h>
+#include <linux/bitops.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+
+#include "cops.h"		/* Our Stuff */
+#include "cops_ltdrv.h"		/* Firmware code for Tangent type cards. */
+#include "cops_ffdrv.h"		/* Firmware code for Dayna type cards. */
+
+/*
+ *      The name of the card. Is used for messages and in the requests for
+ *      io regions, irqs and dma channels
+ */
+
+static const char *cardname = "cops";
+
+#ifdef CONFIG_COPS_DAYNA
+static int board_type = DAYNA;	/* Module exported */
+#else
+static int board_type = TANGENT;
+#endif
+
+static int io = 0x240;		/* Default IO for Dayna */
+static int irq = 5;		/* Default IRQ */
+
+/*
+ *	COPS Autoprobe information.
+ *	Right now if port address is right but IRQ is not 5 this will
+ *      return a 5 no matter what since we will still get a status response.
+ *      Need one more additional check to narrow down after we have gotten
+ *      the ioaddr. But since only other possible IRQs is 3 and 4 so no real
+ *	hurry on this. I *STRONGLY* recommend using IRQ 5 for your card with
+ *	this driver.
+ * 
+ *	This driver has 2 modes and they are: Dayna mode and Tangent mode.
+ *	Each mode corresponds with the type of card. It has been found
+ *	that there are 2 main types of cards and all other cards are
+ *	the same and just have different names or only have minor differences
+ *	such as more IO ports. As this driver is tested it will
+ *	become more clear on exactly what cards are supported. The driver
+ *	defaults to using Dayna mode. To change the drivers mode, simply
+ *	select Dayna or Tangent mode when configuring the kernel.
+ *
+ *      This driver should support:
+ *      TANGENT driver mode:
+ *              Tangent ATB-II, Novell NL-1000, Daystar Digital LT-200,
+ *		COPS LT-1
+ *      DAYNA driver mode:
+ *              Dayna DL2000/DaynaTalk PC (Half Length), COPS LT-95, 
+ *		Farallon PhoneNET PC III, Farallon PhoneNET PC II
+ *	Other cards possibly supported mode unkown though:
+ *		Dayna DL2000 (Full length), COPS LT/M (Micro-Channel)
+ *
+ *	Cards NOT supported by this driver but supported by the ltpc.c
+ *	driver written by Bradford W. Johnson <johns393@maroon.tc.umn.edu>
+ *		Farallon PhoneNET PC
+ *		Original Apple LocalTalk PC card
+ * 
+ *      N.B.
+ *
+ *      The Daystar Digital LT200 boards do not support interrupt-driven
+ *      IO.  You must specify 'irq=0xff' as a module parameter to invoke
+ *      polled mode.  I also believe that the port probing logic is quite
+ *      dangerous at best and certainly hopeless for a polled card.  Best to 
+ *      specify both. - Steve H.
+ *
+ */
+
+/*
+ * Zero terminated list of IO ports to probe.
+ */
+
+static unsigned int ports[] = { 
+	0x240, 0x340, 0x200, 0x210, 0x220, 0x230, 0x260, 
+	0x2A0, 0x300, 0x310, 0x320, 0x330, 0x350, 0x360,
+	0
+};
+
+/*
+ * Zero terminated list of IRQ ports to probe.
+ */
+
+static int cops_irqlist[] = {
+	5, 4, 3, 0 
+};
+
+static struct timer_list cops_timer;
+
+/* use 0 for production, 1 for verification, 2 for debug, 3 for verbose debug */
+#ifndef COPS_DEBUG
+#define COPS_DEBUG 1 
+#endif
+static unsigned int cops_debug = COPS_DEBUG;
+
+/* The number of low I/O ports used by the card. */
+#define COPS_IO_EXTENT       8
+
+/* Information that needs to be kept for each board. */
+
+struct cops_local
+{
+        struct net_device_stats stats;
+        int board;			/* Holds what board type is. */
+	int nodeid;			/* Set to 1 once have nodeid. */
+        unsigned char node_acquire;	/* Node ID when acquired. */
+        struct atalk_addr node_addr;	/* Full node address */
+	spinlock_t lock;		/* RX/TX lock */
+};
+
+/* Index to functions, as function prototypes. */
+static int  cops_probe1 (struct net_device *dev, int ioaddr);
+static int  cops_irq (int ioaddr, int board);
+
+static int  cops_open (struct net_device *dev);
+static int  cops_jumpstart (struct net_device *dev);
+static void cops_reset (struct net_device *dev, int sleep);
+static void cops_load (struct net_device *dev);
+static int  cops_nodeid (struct net_device *dev, int nodeid);
+
+static irqreturn_t cops_interrupt (int irq, void *dev_id, struct pt_regs *regs);
+static void cops_poll (unsigned long ltdev);
+static void cops_timeout(struct net_device *dev);
+static void cops_rx (struct net_device *dev);
+static int  cops_send_packet (struct sk_buff *skb, struct net_device *dev);
+static void set_multicast_list (struct net_device *dev);
+static int  cops_hard_header (struct sk_buff *skb, struct net_device *dev,
+			      unsigned short type, void *daddr, void *saddr, 
+			      unsigned len);
+
+static int  cops_ioctl (struct net_device *dev, struct ifreq *rq, int cmd);
+static int  cops_close (struct net_device *dev);
+static struct net_device_stats *cops_get_stats (struct net_device *dev);
+
+static void cleanup_card(struct net_device *dev)
+{
+	if (dev->irq)
+		free_irq(dev->irq, dev);
+	release_region(dev->base_addr, COPS_IO_EXTENT);
+}
+
+/*
+ *      Check for a network adaptor of this type, and return '0' iff one exists.
+ *      If dev->base_addr == 0, probe all likely locations.
+ *      If dev->base_addr in [1..0x1ff], always return failure.
+ *        otherwise go with what we pass in.
+ */
+struct net_device * __init cops_probe(int unit)
+{
+	struct net_device *dev;
+	unsigned *port;
+	int base_addr;
+	int err = 0;
+
+	dev = alloc_netdev(sizeof(struct cops_local), "lt%d", ltalk_setup);
+	if (!dev)
+		return ERR_PTR(-ENOMEM);
+
+	if (unit >= 0) {
+		sprintf(dev->name, "lt%d", unit);
+		netdev_boot_setup_check(dev);
+		irq = dev->irq;
+		base_addr = dev->base_addr;
+	} else {
+		base_addr = dev->base_addr = io;
+	}
+
+	SET_MODULE_OWNER(dev);
+
+	if (base_addr > 0x1ff) {    /* Check a single specified location. */
+		err = cops_probe1(dev, base_addr);
+	} else if (base_addr != 0) { /* Don't probe at all. */
+		err = -ENXIO;
+	} else {
+		/* FIXME  Does this really work for cards which generate irq?
+		 * It's definitely N.G. for polled Tangent. sh
+		 * Dayna cards don't autoprobe well at all, but if your card is
+		 * at IRQ 5 & IO 0x240 we find it every time. ;) JS
+		 */
+		for (port = ports; *port && cops_probe1(dev, *port) < 0; port++)
+			;
+		if (!*port)
+			err = -ENODEV;
+	}
+	if (err)
+		goto out;
+	err = register_netdev(dev);
+	if (err)
+		goto out1;
+	return dev;
+out1:
+	cleanup_card(dev);
+out:
+	free_netdev(dev);
+	return ERR_PTR(err);
+}
+
+/*
+ *      This is the real probe routine. Linux has a history of friendly device
+ *      probes on the ISA bus. A good device probes avoids doing writes, and
+ *      verifies that the correct device exists and functions.
+ */
+static int __init cops_probe1(struct net_device *dev, int ioaddr)
+{
+        struct cops_local *lp;
+	static unsigned version_printed;
+	int board = board_type;
+	int retval;
+	
+        if(cops_debug && version_printed++ == 0)
+		printk("%s", version);
+
+	/* Grab the region so no one else tries to probe our ioports. */
+	if (!request_region(ioaddr, COPS_IO_EXTENT, dev->name))
+		return -EBUSY;
+
+        /*
+         * Since this board has jumpered interrupts, allocate the interrupt
+         * vector now. There is no point in waiting since no other device
+         * can use the interrupt, and this marks the irq as busy. Jumpered
+         * interrupts are typically not reported by the boards, and we must
+         * used AutoIRQ to find them.
+	 */
+	dev->irq = irq;
+	switch (dev->irq)
+	{
+		case 0:
+			/* COPS AutoIRQ routine */
+			dev->irq = cops_irq(ioaddr, board);
+			if (dev->irq)
+				break;
+			/* No IRQ found on this port, fallthrough */
+		case 1:
+			retval = -EINVAL;
+			goto err_out;
+
+		/* Fixup for users that don't know that IRQ 2 is really
+		 * IRQ 9, or don't know which one to set.
+		 */
+		case 2:
+			dev->irq = 9;
+			break;
+
+		/* Polled operation requested. Although irq of zero passed as
+		 * a parameter tells the init routines to probe, we'll
+		 * overload it to denote polled operation at runtime.
+		 */
+		case 0xff:
+			dev->irq = 0;
+			break;
+
+		default:
+			break;
+	}
+
+	/* Reserve any actual interrupt. */
+	if (dev->irq) {
+		retval = request_irq(dev->irq, &cops_interrupt, 0, dev->name, dev);
+		if (retval)
+			goto err_out;
+	}
+
+	dev->base_addr = ioaddr;
+
+        lp = netdev_priv(dev);
+        memset(lp, 0, sizeof(struct cops_local));
+        spin_lock_init(&lp->lock);
+
+	/* Copy local board variable to lp struct. */
+	lp->board               = board;
+
+	dev->hard_start_xmit    = cops_send_packet;
+	dev->tx_timeout		= cops_timeout;
+	dev->watchdog_timeo	= HZ * 2;
+	dev->hard_header	= cops_hard_header;
+        dev->get_stats          = cops_get_stats;
+	dev->open               = cops_open;
+        dev->stop               = cops_close;
+        dev->do_ioctl           = cops_ioctl;
+	dev->set_multicast_list = set_multicast_list;
+        dev->mc_list            = NULL;
+
+	/* Tell the user where the card is and what mode we're in. */
+	if(board==DAYNA)
+		printk("%s: %s at %#3x, using IRQ %d, in Dayna mode.\n", 
+			dev->name, cardname, ioaddr, dev->irq);
+	if(board==TANGENT) {
+		if(dev->irq)
+			printk("%s: %s at %#3x, IRQ %d, in Tangent mode\n", 
+				dev->name, cardname, ioaddr, dev->irq);
+		else
+			printk("%s: %s at %#3x, using polled IO, in Tangent mode.\n", 
+				dev->name, cardname, ioaddr);
+
+	}
+        return 0;
+
+err_out:
+	release_region(ioaddr, COPS_IO_EXTENT);
+	return retval;
+}
+
+static int __init cops_irq (int ioaddr, int board)
+{       /*
+         * This does not use the IRQ to determine where the IRQ is. We just
+         * assume that when we get a correct status response that it's the IRQ.
+         * This really just verifies the IO port but since we only have access
+         * to such a small number of IRQs (5, 4, 3) this is not bad.
+         * This will probably not work for more than one card.
+         */
+        int irqaddr=0;
+        int i, x, status;
+
+        if(board==DAYNA)
+        {
+                outb(0, ioaddr+DAYNA_RESET);
+                inb(ioaddr+DAYNA_RESET);
+                mdelay(333);
+        }
+        if(board==TANGENT)
+        {
+                inb(ioaddr);
+                outb(0, ioaddr);
+                outb(0, ioaddr+TANG_RESET);
+        }
+
+        for(i=0; cops_irqlist[i] !=0; i++)
+        {
+                irqaddr = cops_irqlist[i];
+                for(x = 0xFFFF; x>0; x --)    /* wait for response */
+                {
+                        if(board==DAYNA)
+                        {
+                                status = (inb(ioaddr+DAYNA_CARD_STATUS)&3);
+                                if(status == 1)
+                                        return irqaddr;
+                        }
+                        if(board==TANGENT)
+                        {
+                                if((inb(ioaddr+TANG_CARD_STATUS)& TANG_TX_READY) !=0)
+                                        return irqaddr;
+                        }
+                }
+        }
+        return 0;       /* no IRQ found */
+}
+
+/*
+ * Open/initialize the board. This is called (in the current kernel)
+ * sometime after booting when the 'ifconfig' program is run.
+ */
+static int cops_open(struct net_device *dev)
+{
+    struct cops_local *lp = netdev_priv(dev);
+
+	if(dev->irq==0)
+	{
+		/*
+		 * I don't know if the Dayna-style boards support polled 
+		 * operation.  For now, only allow it for Tangent.
+		 */
+		if(lp->board==TANGENT)	/* Poll 20 times per second */
+		{
+		    init_timer(&cops_timer);
+		    cops_timer.function = cops_poll;
+		    cops_timer.data 	= (unsigned long)dev;
+		    cops_timer.expires 	= jiffies + HZ/20;
+		    add_timer(&cops_timer);
+		} 
+		else 
+		{
+			printk(KERN_WARNING "%s: No irq line set\n", dev->name);
+			return -EAGAIN;
+		}
+	}
+
+	cops_jumpstart(dev);	/* Start the card up. */
+
+	netif_start_queue(dev);
+        return 0;
+}
+
+/*
+ *	This allows for a dynamic start/restart of the entire card.
+ */
+static int cops_jumpstart(struct net_device *dev)
+{
+	struct cops_local *lp = netdev_priv(dev);
+
+	/*
+         *      Once the card has the firmware loaded and has acquired
+         *      the nodeid, if it is reset it will lose it all.
+         */
+        cops_reset(dev,1);	/* Need to reset card before load firmware. */
+        cops_load(dev);		/* Load the firmware. */
+
+	/*
+	 *	If atalkd already gave us a nodeid we will use that
+	 *	one again, else we wait for atalkd to give us a nodeid
+	 *	in cops_ioctl. This may cause a problem if someone steals
+	 *	our nodeid while we are resetting.
+	 */	
+	if(lp->nodeid == 1)
+		cops_nodeid(dev,lp->node_acquire);
+
+	return 0;
+}
+
+static void tangent_wait_reset(int ioaddr)
+{
+	int timeout=0;
+
+	while(timeout++ < 5 && (inb(ioaddr+TANG_CARD_STATUS)&TANG_TX_READY)==0)
+		mdelay(1);   /* Wait 1 second */
+}
+
+/*
+ *      Reset the LocalTalk board.
+ */
+static void cops_reset(struct net_device *dev, int sleep)
+{
+        struct cops_local *lp = netdev_priv(dev);
+        int ioaddr=dev->base_addr;
+
+        if(lp->board==TANGENT)
+        {
+                inb(ioaddr);		/* Clear request latch. */
+                outb(0,ioaddr);		/* Clear the TANG_TX_READY flop. */
+                outb(0, ioaddr+TANG_RESET);	/* Reset the adapter. */
+
+		tangent_wait_reset(ioaddr);
+                outb(0, ioaddr+TANG_CLEAR_INT);
+        }
+        if(lp->board==DAYNA)
+        {
+                outb(0, ioaddr+DAYNA_RESET);	/* Assert the reset port */
+                inb(ioaddr+DAYNA_RESET);	/* Clear the reset */
+                if(sleep)
+                {
+                        long snap=jiffies;
+
+			/* Let card finish initializing, about 1/3 second */
+	                while(jiffies-snap<HZ/3)
+                                schedule();
+                }
+                else
+                        mdelay(333);
+        }
+	netif_wake_queue(dev);
+	return;
+}
+
+static void cops_load (struct net_device *dev)
+{
+        struct ifreq ifr;
+        struct ltfirmware *ltf= (struct ltfirmware *)&ifr.ifr_ifru;
+        struct cops_local *lp = netdev_priv(dev);
+        int ioaddr=dev->base_addr;
+	int length, i = 0;
+
+        strcpy(ifr.ifr_name,"lt0");
+
+        /* Get card's firmware code and do some checks on it. */
+#ifdef CONFIG_COPS_DAYNA        
+        if(lp->board==DAYNA)
+        {
+                ltf->length=sizeof(ffdrv_code);
+                ltf->data=ffdrv_code;
+        }
+        else
+#endif        
+#ifdef CONFIG_COPS_TANGENT
+        if(lp->board==TANGENT)
+        {
+                ltf->length=sizeof(ltdrv_code);
+                ltf->data=ltdrv_code;
+        }
+        else
+#endif
+	{
+		printk(KERN_INFO "%s; unsupported board type.\n", dev->name);
+		return;
+	}
+	
+        /* Check to make sure firmware is correct length. */
+        if(lp->board==DAYNA && ltf->length!=5983)
+        {
+                printk(KERN_WARNING "%s: Firmware is not length of FFDRV.BIN.\n", dev->name);
+                return;
+        }
+        if(lp->board==TANGENT && ltf->length!=2501)
+        {
+                printk(KERN_WARNING "%s: Firmware is not length of DRVCODE.BIN.\n", dev->name);
+                return;
+        }
+
+        if(lp->board==DAYNA)
+        {
+                /*
+                 *      We must wait for a status response
+                 *      with the DAYNA board.
+                 */
+                while(++i<65536)
+                {
+                       if((inb(ioaddr+DAYNA_CARD_STATUS)&3)==1)
+                                break;
+                }
+
+                if(i==65536)
+                        return;
+        }
+
+        /*
+         *      Upload the firmware and kick. Byte-by-byte works nicely here.
+         */
+	i=0;
+        length = ltf->length;
+        while(length--)
+        {
+                outb(ltf->data[i], ioaddr);
+                i++;
+        }
+
+	if(cops_debug > 1)
+		printk("%s: Uploaded firmware - %d bytes of %d bytes.\n", 
+			dev->name, i, ltf->length);
+
+        if(lp->board==DAYNA) 	/* Tell Dayna to run the firmware code. */
+                outb(1, ioaddr+DAYNA_INT_CARD);
+	else			/* Tell Tang to run the firmware code. */
+		inb(ioaddr);
+
+        if(lp->board==TANGENT)
+        {
+                tangent_wait_reset(ioaddr);
+                inb(ioaddr);	/* Clear initial ready signal. */
+        }
+
+        return;
+}
+
+/*
+ * 	Get the LocalTalk Nodeid from the card. We can suggest
+ *	any nodeid 1-254. The card will try and get that exact
+ *	address else we can specify 0 as the nodeid and the card
+ *	will autoprobe for a nodeid.
+ */
+static int cops_nodeid (struct net_device *dev, int nodeid)
+{
+	struct cops_local *lp = netdev_priv(dev);
+	int ioaddr = dev->base_addr;
+
+	if(lp->board == DAYNA)
+        {
+        	/* Empty any pending adapter responses. */
+                while((inb(ioaddr+DAYNA_CARD_STATUS)&DAYNA_TX_READY)==0)
+                {
+			outb(0, ioaddr+COPS_CLEAR_INT);	/* Clear interrupts. */
+        		if((inb(ioaddr+DAYNA_CARD_STATUS)&0x03)==DAYNA_RX_REQUEST)
+                		cops_rx(dev);	/* Kick any packets waiting. */
+			schedule();
+                }
+
+                outb(2, ioaddr);       	/* Output command packet length as 2. */
+                outb(0, ioaddr);
+                outb(LAP_INIT, ioaddr);	/* Send LAP_INIT command byte. */
+                outb(nodeid, ioaddr);  	/* Suggest node address. */
+        }
+
+	if(lp->board == TANGENT)
+        {
+                /* Empty any pending adapter responses. */
+                while(inb(ioaddr+TANG_CARD_STATUS)&TANG_RX_READY)
+                {
+			outb(0, ioaddr+COPS_CLEAR_INT);	/* Clear interrupt. */
+                	cops_rx(dev);          	/* Kick out packets waiting. */
+			schedule();
+                }
+
+		/* Not sure what Tangent does if nodeid picked is used. */
+                if(nodeid == 0)	         		/* Seed. */
+                	nodeid = jiffies&0xFF;		/* Get a random try */
+                outb(2, ioaddr);        		/* Command length LSB */
+                outb(0, ioaddr);       			/* Command length MSB */
+                outb(LAP_INIT, ioaddr); 		/* Send LAP_INIT byte */
+                outb(nodeid, ioaddr); 		  	/* LAP address hint. */
+                outb(0xFF, ioaddr);     		/* Int. level to use */
+        }
+
+	lp->node_acquire=0;		/* Set nodeid holder to 0. */
+        while(lp->node_acquire==0)	/* Get *True* nodeid finally. */
+	{
+		outb(0, ioaddr+COPS_CLEAR_INT);	/* Clear any interrupt. */
+
+		if(lp->board == DAYNA)
+		{
+                	if((inb(ioaddr+DAYNA_CARD_STATUS)&0x03)==DAYNA_RX_REQUEST)
+                		cops_rx(dev);	/* Grab the nodeid put in lp->node_acquire. */
+		}
+		if(lp->board == TANGENT)
+		{	
+			if(inb(ioaddr+TANG_CARD_STATUS)&TANG_RX_READY)
+                                cops_rx(dev);   /* Grab the nodeid put in lp->node_acquire. */
+		}
+		schedule();
+	}
+
+	if(cops_debug > 1)
+		printk(KERN_DEBUG "%s: Node ID %d has been acquired.\n", 
+			dev->name, lp->node_acquire);
+
+	lp->nodeid=1;	/* Set got nodeid to 1. */
+
+        return 0;
+}
+
+/*
+ *	Poll the Tangent type cards to see if we have work.
+ */
+ 
+static void cops_poll(unsigned long ltdev)
+{
+	int ioaddr, status;
+	int boguscount = 0;
+
+	struct net_device *dev = (struct net_device *)ltdev;
+
+	del_timer(&cops_timer);
+
+	if(dev == NULL)
+		return;	/* We've been downed */
+
+	ioaddr = dev->base_addr;
+	do {
+		status=inb(ioaddr+TANG_CARD_STATUS);
+		if(status & TANG_RX_READY)
+			cops_rx(dev);
+		if(status & TANG_TX_READY)
+			netif_wake_queue(dev);
+		status = inb(ioaddr+TANG_CARD_STATUS);
+	} while((++boguscount < 20) && (status&(TANG_RX_READY|TANG_TX_READY)));
+
+	/* poll 20 times per second */
+	cops_timer.expires = jiffies + HZ/20;
+	add_timer(&cops_timer);
+
+	return;
+}
+
+/*
+ *      The typical workload of the driver:
+ *      Handle the network interface interrupts.
+ */
+static irqreturn_t cops_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+{
+        struct net_device *dev = dev_id;
+        struct cops_local *lp;
+        int ioaddr, status;
+        int boguscount = 0;
+
+        ioaddr = dev->base_addr;
+        lp = netdev_priv(dev);
+
+	if(lp->board==DAYNA)
+	{
+		do {
+			outb(0, ioaddr + COPS_CLEAR_INT);
+                       	status=inb(ioaddr+DAYNA_CARD_STATUS);
+                       	if((status&0x03)==DAYNA_RX_REQUEST)
+                       	        cops_rx(dev);
+                	netif_wake_queue(dev);
+		} while(++boguscount < 20);
+	}
+	else
+	{
+		do {
+                       	status=inb(ioaddr+TANG_CARD_STATUS);
+			if(status & TANG_RX_READY)
+				cops_rx(dev);
+			if(status & TANG_TX_READY)
+				netif_wake_queue(dev);
+			status=inb(ioaddr+TANG_CARD_STATUS);
+		} while((++boguscount < 20) && (status&(TANG_RX_READY|TANG_TX_READY)));
+	}
+
+        return IRQ_HANDLED;
+}
+
+/*
+ *      We have a good packet(s), get it/them out of the buffers.
+ */
+static void cops_rx(struct net_device *dev)
+{
+        int pkt_len = 0;
+        int rsp_type = 0;
+        struct sk_buff *skb = NULL;
+        struct cops_local *lp = netdev_priv(dev);
+        int ioaddr = dev->base_addr;
+        int boguscount = 0;
+        unsigned long flags;
+
+
+	spin_lock_irqsave(&lp->lock, flags);
+	
+        if(lp->board==DAYNA)
+        {
+                outb(0, ioaddr);                /* Send out Zero length. */
+                outb(0, ioaddr);
+                outb(DATA_READ, ioaddr);        /* Send read command out. */
+
+                /* Wait for DMA to turn around. */
+                while(++boguscount<1000000)
+                {
+			barrier();
+                        if((inb(ioaddr+DAYNA_CARD_STATUS)&0x03)==DAYNA_RX_READY)
+                                break;
+                }
+
+                if(boguscount==1000000)
+                {
+                        printk(KERN_WARNING "%s: DMA timed out.\n",dev->name);
+			spin_unlock_irqrestore(&lp->lock, flags);
+                        return;
+                }
+        }
+
+        /* Get response length. */
+	if(lp->board==DAYNA)
+        	pkt_len = inb(ioaddr) & 0xFF;
+	else
+		pkt_len = inb(ioaddr) & 0x00FF;
+        pkt_len |= (inb(ioaddr) << 8);
+        /* Input IO code. */
+        rsp_type=inb(ioaddr);
+
+        /* Malloc up new buffer. */
+        skb = dev_alloc_skb(pkt_len);
+        if(skb == NULL)
+        {
+                printk(KERN_WARNING "%s: Memory squeeze, dropping packet.\n",
+			dev->name);
+                lp->stats.rx_dropped++;
+                while(pkt_len--)        /* Discard packet */
+                        inb(ioaddr);
+                spin_unlock_irqrestore(&lp->lock, flags);
+                return;
+        }
+        skb->dev = dev;
+        skb_put(skb, pkt_len);
+        skb->protocol = htons(ETH_P_LOCALTALK);
+
+        insb(ioaddr, skb->data, pkt_len);               /* Eat the Data */
+
+        if(lp->board==DAYNA)
+                outb(1, ioaddr+DAYNA_INT_CARD);         /* Interrupt the card */
+
+        spin_unlock_irqrestore(&lp->lock, flags);  /* Restore interrupts. */
+
+        /* Check for bad response length */
+        if(pkt_len < 0 || pkt_len > MAX_LLAP_SIZE)
+        {
+		printk(KERN_WARNING "%s: Bad packet length of %d bytes.\n", 
+			dev->name, pkt_len);
+                lp->stats.tx_errors++;
+                dev_kfree_skb_any(skb);
+                return;
+        }
+
+        /* Set nodeid and then get out. */
+        if(rsp_type == LAP_INIT_RSP)
+        {	/* Nodeid taken from received packet. */
+                lp->node_acquire = skb->data[0];
+                dev_kfree_skb_any(skb);
+                return;
+        }
+
+        /* One last check to make sure we have a good packet. */
+        if(rsp_type != LAP_RESPONSE)
+        {
+                printk(KERN_WARNING "%s: Bad packet type %d.\n", dev->name, rsp_type);
+                lp->stats.tx_errors++;
+                dev_kfree_skb_any(skb);
+                return;
+        }
+
+        skb->mac.raw    = skb->data;    /* Point to entire packet. */
+        skb_pull(skb,3);
+        skb->h.raw      = skb->data;    /* Point to data (Skip header). */
+
+        /* Update the counters. */
+        lp->stats.rx_packets++;
+        lp->stats.rx_bytes += skb->len;
+
+        /* Send packet to a higher place. */
+        netif_rx(skb);
+	dev->last_rx = jiffies;
+}
+
+static void cops_timeout(struct net_device *dev)
+{
+        struct cops_local *lp = netdev_priv(dev);
+        int ioaddr = dev->base_addr;
+
+	lp->stats.tx_errors++;
+        if(lp->board==TANGENT)
+        {
+		if((inb(ioaddr+TANG_CARD_STATUS)&TANG_TX_READY)==0)
+               		printk(KERN_WARNING "%s: No TX complete interrupt.\n", dev->name);
+	}
+	printk(KERN_WARNING "%s: Transmit timed out.\n", dev->name);
+	cops_jumpstart(dev);	/* Restart the card. */
+	dev->trans_start = jiffies;
+	netif_wake_queue(dev);
+}
+
+
+/*
+ *	Make the card transmit a LocalTalk packet.
+ */
+
+static int cops_send_packet(struct sk_buff *skb, struct net_device *dev)
+{
+        struct cops_local *lp = netdev_priv(dev);
+        int ioaddr = dev->base_addr;
+        unsigned long flags;
+
+        /*
+         * Block a timer-based transmit from overlapping. 
+	 */
+	 
+	netif_stop_queue(dev);
+
+	spin_lock_irqsave(&lp->lock, flags);
+	if(lp->board == DAYNA)	 /* Wait for adapter transmit buffer. */
+		while((inb(ioaddr+DAYNA_CARD_STATUS)&DAYNA_TX_READY)==0)
+			cpu_relax();
+	if(lp->board == TANGENT) /* Wait for adapter transmit buffer. */
+		while((inb(ioaddr+TANG_CARD_STATUS)&TANG_TX_READY)==0)
+			cpu_relax();
+
+	/* Output IO length. */
+	outb(skb->len, ioaddr);
+	if(lp->board == DAYNA)
+               	outb(skb->len >> 8, ioaddr);
+	else
+		outb((skb->len >> 8)&0x0FF, ioaddr);
+
+	/* Output IO code. */
+	outb(LAP_WRITE, ioaddr);
+
+	if(lp->board == DAYNA)	/* Check the transmit buffer again. */
+        	while((inb(ioaddr+DAYNA_CARD_STATUS)&DAYNA_TX_READY)==0);
+
+	outsb(ioaddr, skb->data, skb->len);	/* Send out the data. */
+
+	if(lp->board==DAYNA)	/* Dayna requires you kick the card */
+		outb(1, ioaddr+DAYNA_INT_CARD);
+
+	spin_unlock_irqrestore(&lp->lock, flags);	/* Restore interrupts. */
+
+	/* Done sending packet, update counters and cleanup. */
+	lp->stats.tx_packets++;
+	lp->stats.tx_bytes += skb->len;
+	dev->trans_start = jiffies;
+	dev_kfree_skb (skb);
+        return 0;
+}
+
+/*
+ *	Dummy function to keep the Appletalk layer happy.
+ */
+ 
+static void set_multicast_list(struct net_device *dev)
+{
+        if(cops_debug >= 3)
+		printk("%s: set_multicast_list executed\n", dev->name);
+}
+
+/*
+ *      Another Dummy function to keep the Appletalk layer happy.
+ */
+ 
+static int cops_hard_header(struct sk_buff *skb, struct net_device *dev,
+			    unsigned short type, void *daddr, void *saddr, 
+			    unsigned len)
+{
+        if(cops_debug >= 3)
+                printk("%s: cops_hard_header executed. Wow!\n", dev->name);
+        return 0;
+}
+
+/*
+ *      System ioctls for the COPS LocalTalk card.
+ */
+ 
+static int cops_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+        struct cops_local *lp = netdev_priv(dev);
+        struct sockaddr_at *sa = (struct sockaddr_at *)&ifr->ifr_addr;
+        struct atalk_addr *aa = (struct atalk_addr *)&lp->node_addr;
+
+        switch(cmd)
+        {
+                case SIOCSIFADDR:
+			/* Get and set the nodeid and network # atalkd wants. */
+			cops_nodeid(dev, sa->sat_addr.s_node);
+			aa->s_net               = sa->sat_addr.s_net;
+                        aa->s_node              = lp->node_acquire;
+
+			/* Set broardcast address. */
+                        dev->broadcast[0]       = 0xFF;
+			
+			/* Set hardware address. */
+                        dev->dev_addr[0]        = aa->s_node;
+                        dev->addr_len           = 1;
+                        return 0;
+
+                case SIOCGIFADDR:
+                        sa->sat_addr.s_net      = aa->s_net;
+                        sa->sat_addr.s_node     = aa->s_node;
+                        return 0;
+
+                default:
+                        return -EOPNOTSUPP;
+        }
+}
+
+/*
+ *	The inverse routine to cops_open().
+ */
+ 
+static int cops_close(struct net_device *dev)
+{
+	struct cops_local *lp = netdev_priv(dev);
+
+	/* If we were running polled, yank the timer.
+	 */
+	if(lp->board==TANGENT && dev->irq==0)
+		del_timer(&cops_timer);
+
+	netif_stop_queue(dev);
+        return 0;
+}
+
+/*
+ *      Get the current statistics.
+ *      This may be called with the card open or closed.
+ */
+static struct net_device_stats *cops_get_stats(struct net_device *dev)
+{
+        struct cops_local *lp = netdev_priv(dev);
+        return &lp->stats;
+}
+
+#ifdef MODULE
+static struct net_device *cops_dev;
+
+MODULE_LICENSE("GPL");
+module_param(io, int, 0);
+module_param(irq, int, 0);
+module_param(board_type, int, 0);
+
+int init_module(void)
+{
+	if (io == 0)
+		printk(KERN_WARNING "%s: You shouldn't autoprobe with insmod\n",
+			cardname);
+	cops_dev = cops_probe(-1);
+	if (IS_ERR(cops_dev))
+		return PTR_ERR(cops_dev);
+        return 0;
+}
+
+void cleanup_module(void)
+{
+	unregister_netdev(cops_dev);
+	cleanup_card(cops_dev);
+	free_netdev(cops_dev);
+}
+#endif /* MODULE */
+
+/*
+ * Local variables:
+ *  compile-command: "gcc -DMODVERSIONS -DMODULE -D__KERNEL__ -Wall -Wstrict-prototypes -O2 -c cops.c"
+ *  c-basic-offset: 4
+ *  c-file-offsets: ((substatement-open . 0))
+ * End:
+ */