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/drivers/net/appletalk/cops.c

http://github.com/mirrors/linux
C | 1003 lines | 634 code | 141 blank | 228 comment | 105 complexity | 6f3348202b1b37890ed81e614e352c16 MD5 | raw file
   1/*      cops.c: LocalTalk driver for Linux.
   2 *
   3 *	Authors:
   4 *      - Jay Schulist <jschlst@samba.org>
   5 *
   6 *	With more than a little help from;
   7 *	- Alan Cox <alan@lxorguk.ukuu.org.uk>
   8 *
   9 *      Derived from:
  10 *      - skeleton.c: A network driver outline for linux.
  11 *        Written 1993-94 by Donald Becker.
  12 *	- ltpc.c: A driver for the LocalTalk PC card.
  13 *	  Written by Bradford W. Johnson.
  14 *
  15 *      Copyright 1993 United States Government as represented by the
  16 *      Director, National Security Agency.
  17 *
  18 *      This software may be used and distributed according to the terms
  19 *      of the GNU General Public License, incorporated herein by reference.
  20 *
  21 *	Changes:
  22 *	19970608	Alan Cox	Allowed dual card type support
  23 *					Can set board type in insmod
  24 *					Hooks for cops_setup routine
  25 *					(not yet implemented).
  26 *	19971101	Jay Schulist	Fixes for multiple lt* devices.
  27 *	19980607	Steven Hirsch	Fixed the badly broken support
  28 *					for Tangent type cards. Only
  29 *                                      tested on Daystar LT200. Some
  30 *                                      cleanup of formatting and program
  31 *                                      logic.  Added emacs 'local-vars'
  32 *                                      setup for Jay's brace style.
  33 *	20000211	Alan Cox	Cleaned up for softnet
  34 */
  35
  36static const char *version =
  37"cops.c:v0.04 6/7/98 Jay Schulist <jschlst@samba.org>\n";
  38/*
  39 *  Sources:
  40 *      COPS Localtalk SDK. This provides almost all of the information
  41 *      needed.
  42 */
  43
  44/*
  45 * insmod/modprobe configurable stuff.
  46 *	- IO Port, choose one your card supports or 0 if you dare.
  47 *	- IRQ, also choose one your card supports or nothing and let
  48 *	  the driver figure it out.
  49 */
  50
  51#include <linux/module.h>
  52#include <linux/kernel.h>
  53#include <linux/types.h>
  54#include <linux/fcntl.h>
  55#include <linux/interrupt.h>
  56#include <linux/ptrace.h>
  57#include <linux/ioport.h>
  58#include <linux/in.h>
  59#include <linux/string.h>
  60#include <linux/errno.h>
  61#include <linux/init.h>
  62#include <linux/netdevice.h>
  63#include <linux/etherdevice.h>
  64#include <linux/skbuff.h>
  65#include <linux/if_arp.h>
  66#include <linux/if_ltalk.h>
  67#include <linux/delay.h>	/* For udelay() */
  68#include <linux/atalk.h>
  69#include <linux/spinlock.h>
  70#include <linux/bitops.h>
  71#include <linux/jiffies.h>
  72
  73#include <asm/io.h>
  74#include <asm/dma.h>
  75
  76#include "cops.h"		/* Our Stuff */
  77#include "cops_ltdrv.h"		/* Firmware code for Tangent type cards. */
  78#include "cops_ffdrv.h"		/* Firmware code for Dayna type cards. */
  79
  80/*
  81 *      The name of the card. Is used for messages and in the requests for
  82 *      io regions, irqs and dma channels
  83 */
  84
  85static const char *cardname = "cops";
  86
  87#ifdef CONFIG_COPS_DAYNA
  88static int board_type = DAYNA;	/* Module exported */
  89#else
  90static int board_type = TANGENT;
  91#endif
  92
  93static int io = 0x240;		/* Default IO for Dayna */
  94static int irq = 5;		/* Default IRQ */
  95
  96/*
  97 *	COPS Autoprobe information.
  98 *	Right now if port address is right but IRQ is not 5 this will
  99 *      return a 5 no matter what since we will still get a status response.
 100 *      Need one more additional check to narrow down after we have gotten
 101 *      the ioaddr. But since only other possible IRQs is 3 and 4 so no real
 102 *	hurry on this. I *STRONGLY* recommend using IRQ 5 for your card with
 103 *	this driver.
 104 * 
 105 *	This driver has 2 modes and they are: Dayna mode and Tangent mode.
 106 *	Each mode corresponds with the type of card. It has been found
 107 *	that there are 2 main types of cards and all other cards are
 108 *	the same and just have different names or only have minor differences
 109 *	such as more IO ports. As this driver is tested it will
 110 *	become more clear on exactly what cards are supported. The driver
 111 *	defaults to using Dayna mode. To change the drivers mode, simply
 112 *	select Dayna or Tangent mode when configuring the kernel.
 113 *
 114 *      This driver should support:
 115 *      TANGENT driver mode:
 116 *              Tangent ATB-II, Novell NL-1000, Daystar Digital LT-200,
 117 *		COPS LT-1
 118 *      DAYNA driver mode:
 119 *              Dayna DL2000/DaynaTalk PC (Half Length), COPS LT-95, 
 120 *		Farallon PhoneNET PC III, Farallon PhoneNET PC II
 121 *	Other cards possibly supported mode unknown though:
 122 *		Dayna DL2000 (Full length), COPS LT/M (Micro-Channel)
 123 *
 124 *	Cards NOT supported by this driver but supported by the ltpc.c
 125 *	driver written by Bradford W. Johnson <johns393@maroon.tc.umn.edu>
 126 *		Farallon PhoneNET PC
 127 *		Original Apple LocalTalk PC card
 128 * 
 129 *      N.B.
 130 *
 131 *      The Daystar Digital LT200 boards do not support interrupt-driven
 132 *      IO.  You must specify 'irq=0xff' as a module parameter to invoke
 133 *      polled mode.  I also believe that the port probing logic is quite
 134 *      dangerous at best and certainly hopeless for a polled card.  Best to 
 135 *      specify both. - Steve H.
 136 *
 137 */
 138
 139/*
 140 * Zero terminated list of IO ports to probe.
 141 */
 142
 143static unsigned int ports[] = { 
 144	0x240, 0x340, 0x200, 0x210, 0x220, 0x230, 0x260, 
 145	0x2A0, 0x300, 0x310, 0x320, 0x330, 0x350, 0x360,
 146	0
 147};
 148
 149/*
 150 * Zero terminated list of IRQ ports to probe.
 151 */
 152
 153static int cops_irqlist[] = {
 154	5, 4, 3, 0 
 155};
 156
 157static struct timer_list cops_timer;
 158static struct net_device *cops_timer_dev;
 159
 160/* use 0 for production, 1 for verification, 2 for debug, 3 for verbose debug */
 161#ifndef COPS_DEBUG
 162#define COPS_DEBUG 1 
 163#endif
 164static unsigned int cops_debug = COPS_DEBUG;
 165
 166/* The number of low I/O ports used by the card. */
 167#define COPS_IO_EXTENT       8
 168
 169/* Information that needs to be kept for each board. */
 170
 171struct cops_local
 172{
 173        int board;			/* Holds what board type is. */
 174	int nodeid;			/* Set to 1 once have nodeid. */
 175        unsigned char node_acquire;	/* Node ID when acquired. */
 176        struct atalk_addr node_addr;	/* Full node address */
 177	spinlock_t lock;		/* RX/TX lock */
 178};
 179
 180/* Index to functions, as function prototypes. */
 181static int  cops_probe1 (struct net_device *dev, int ioaddr);
 182static int  cops_irq (int ioaddr, int board);
 183
 184static int  cops_open (struct net_device *dev);
 185static int  cops_jumpstart (struct net_device *dev);
 186static void cops_reset (struct net_device *dev, int sleep);
 187static void cops_load (struct net_device *dev);
 188static int  cops_nodeid (struct net_device *dev, int nodeid);
 189
 190static irqreturn_t cops_interrupt (int irq, void *dev_id);
 191static void cops_poll(struct timer_list *t);
 192static void cops_timeout(struct net_device *dev, unsigned int txqueue);
 193static void cops_rx (struct net_device *dev);
 194static netdev_tx_t  cops_send_packet (struct sk_buff *skb,
 195					    struct net_device *dev);
 196static void set_multicast_list (struct net_device *dev);
 197static int  cops_ioctl (struct net_device *dev, struct ifreq *rq, int cmd);
 198static int  cops_close (struct net_device *dev);
 199
 200static void cleanup_card(struct net_device *dev)
 201{
 202	if (dev->irq)
 203		free_irq(dev->irq, dev);
 204	release_region(dev->base_addr, COPS_IO_EXTENT);
 205}
 206
 207/*
 208 *      Check for a network adaptor of this type, and return '0' iff one exists.
 209 *      If dev->base_addr == 0, probe all likely locations.
 210 *      If dev->base_addr in [1..0x1ff], always return failure.
 211 *        otherwise go with what we pass in.
 212 */
 213struct net_device * __init cops_probe(int unit)
 214{
 215	struct net_device *dev;
 216	unsigned *port;
 217	int base_addr;
 218	int err = 0;
 219
 220	dev = alloc_ltalkdev(sizeof(struct cops_local));
 221	if (!dev)
 222		return ERR_PTR(-ENOMEM);
 223
 224	if (unit >= 0) {
 225		sprintf(dev->name, "lt%d", unit);
 226		netdev_boot_setup_check(dev);
 227		irq = dev->irq;
 228		base_addr = dev->base_addr;
 229	} else {
 230		base_addr = dev->base_addr = io;
 231	}
 232
 233	if (base_addr > 0x1ff) {    /* Check a single specified location. */
 234		err = cops_probe1(dev, base_addr);
 235	} else if (base_addr != 0) { /* Don't probe at all. */
 236		err = -ENXIO;
 237	} else {
 238		/* FIXME  Does this really work for cards which generate irq?
 239		 * It's definitely N.G. for polled Tangent. sh
 240		 * Dayna cards don't autoprobe well at all, but if your card is
 241		 * at IRQ 5 & IO 0x240 we find it every time. ;) JS
 242		 */
 243		for (port = ports; *port && cops_probe1(dev, *port) < 0; port++)
 244			;
 245		if (!*port)
 246			err = -ENODEV;
 247	}
 248	if (err)
 249		goto out;
 250	err = register_netdev(dev);
 251	if (err)
 252		goto out1;
 253	return dev;
 254out1:
 255	cleanup_card(dev);
 256out:
 257	free_netdev(dev);
 258	return ERR_PTR(err);
 259}
 260
 261static const struct net_device_ops cops_netdev_ops = {
 262	.ndo_open               = cops_open,
 263        .ndo_stop               = cops_close,
 264	.ndo_start_xmit   	= cops_send_packet,
 265	.ndo_tx_timeout		= cops_timeout,
 266        .ndo_do_ioctl           = cops_ioctl,
 267	.ndo_set_rx_mode	= set_multicast_list,
 268};
 269
 270/*
 271 *      This is the real probe routine. Linux has a history of friendly device
 272 *      probes on the ISA bus. A good device probes avoids doing writes, and
 273 *      verifies that the correct device exists and functions.
 274 */
 275static int __init cops_probe1(struct net_device *dev, int ioaddr)
 276{
 277        struct cops_local *lp;
 278	static unsigned version_printed;
 279	int board = board_type;
 280	int retval;
 281	
 282        if(cops_debug && version_printed++ == 0)
 283		printk("%s", version);
 284
 285	/* Grab the region so no one else tries to probe our ioports. */
 286	if (!request_region(ioaddr, COPS_IO_EXTENT, dev->name))
 287		return -EBUSY;
 288
 289        /*
 290         * Since this board has jumpered interrupts, allocate the interrupt
 291         * vector now. There is no point in waiting since no other device
 292         * can use the interrupt, and this marks the irq as busy. Jumpered
 293         * interrupts are typically not reported by the boards, and we must
 294         * used AutoIRQ to find them.
 295	 */
 296	dev->irq = irq;
 297	switch (dev->irq)
 298	{
 299		case 0:
 300			/* COPS AutoIRQ routine */
 301			dev->irq = cops_irq(ioaddr, board);
 302			if (dev->irq)
 303				break;
 304			/* fall through - Once no IRQ found on this port. */
 305		case 1:
 306			retval = -EINVAL;
 307			goto err_out;
 308
 309		/* Fixup for users that don't know that IRQ 2 is really
 310		 * IRQ 9, or don't know which one to set.
 311		 */
 312		case 2:
 313			dev->irq = 9;
 314			break;
 315
 316		/* Polled operation requested. Although irq of zero passed as
 317		 * a parameter tells the init routines to probe, we'll
 318		 * overload it to denote polled operation at runtime.
 319		 */
 320		case 0xff:
 321			dev->irq = 0;
 322			break;
 323
 324		default:
 325			break;
 326	}
 327
 328	/* Reserve any actual interrupt. */
 329	if (dev->irq) {
 330		retval = request_irq(dev->irq, cops_interrupt, 0, dev->name, dev);
 331		if (retval)
 332			goto err_out;
 333	}
 334
 335	dev->base_addr = ioaddr;
 336
 337        lp = netdev_priv(dev);
 338        spin_lock_init(&lp->lock);
 339
 340	/* Copy local board variable to lp struct. */
 341	lp->board               = board;
 342
 343	dev->netdev_ops 	= &cops_netdev_ops;
 344	dev->watchdog_timeo	= HZ * 2;
 345
 346
 347	/* Tell the user where the card is and what mode we're in. */
 348	if(board==DAYNA)
 349		printk("%s: %s at %#3x, using IRQ %d, in Dayna mode.\n", 
 350			dev->name, cardname, ioaddr, dev->irq);
 351	if(board==TANGENT) {
 352		if(dev->irq)
 353			printk("%s: %s at %#3x, IRQ %d, in Tangent mode\n", 
 354				dev->name, cardname, ioaddr, dev->irq);
 355		else
 356			printk("%s: %s at %#3x, using polled IO, in Tangent mode.\n", 
 357				dev->name, cardname, ioaddr);
 358
 359	}
 360        return 0;
 361
 362err_out:
 363	release_region(ioaddr, COPS_IO_EXTENT);
 364	return retval;
 365}
 366
 367static int __init cops_irq (int ioaddr, int board)
 368{       /*
 369         * This does not use the IRQ to determine where the IRQ is. We just
 370         * assume that when we get a correct status response that it's the IRQ.
 371         * This really just verifies the IO port but since we only have access
 372         * to such a small number of IRQs (5, 4, 3) this is not bad.
 373         * This will probably not work for more than one card.
 374         */
 375        int irqaddr=0;
 376        int i, x, status;
 377
 378        if(board==DAYNA)
 379        {
 380                outb(0, ioaddr+DAYNA_RESET);
 381                inb(ioaddr+DAYNA_RESET);
 382                mdelay(333);
 383        }
 384        if(board==TANGENT)
 385        {
 386                inb(ioaddr);
 387                outb(0, ioaddr);
 388                outb(0, ioaddr+TANG_RESET);
 389        }
 390
 391        for(i=0; cops_irqlist[i] !=0; i++)
 392        {
 393                irqaddr = cops_irqlist[i];
 394                for(x = 0xFFFF; x>0; x --)    /* wait for response */
 395                {
 396                        if(board==DAYNA)
 397                        {
 398                                status = (inb(ioaddr+DAYNA_CARD_STATUS)&3);
 399                                if(status == 1)
 400                                        return irqaddr;
 401                        }
 402                        if(board==TANGENT)
 403                        {
 404                                if((inb(ioaddr+TANG_CARD_STATUS)& TANG_TX_READY) !=0)
 405                                        return irqaddr;
 406                        }
 407                }
 408        }
 409        return 0;       /* no IRQ found */
 410}
 411
 412/*
 413 * Open/initialize the board. This is called (in the current kernel)
 414 * sometime after booting when the 'ifconfig' program is run.
 415 */
 416static int cops_open(struct net_device *dev)
 417{
 418    struct cops_local *lp = netdev_priv(dev);
 419
 420	if(dev->irq==0)
 421	{
 422		/*
 423		 * I don't know if the Dayna-style boards support polled 
 424		 * operation.  For now, only allow it for Tangent.
 425		 */
 426		if(lp->board==TANGENT)	/* Poll 20 times per second */
 427		{
 428		    cops_timer_dev = dev;
 429		    timer_setup(&cops_timer, cops_poll, 0);
 430		    cops_timer.expires 	= jiffies + HZ/20;
 431		    add_timer(&cops_timer);
 432		} 
 433		else 
 434		{
 435			printk(KERN_WARNING "%s: No irq line set\n", dev->name);
 436			return -EAGAIN;
 437		}
 438	}
 439
 440	cops_jumpstart(dev);	/* Start the card up. */
 441
 442	netif_start_queue(dev);
 443        return 0;
 444}
 445
 446/*
 447 *	This allows for a dynamic start/restart of the entire card.
 448 */
 449static int cops_jumpstart(struct net_device *dev)
 450{
 451	struct cops_local *lp = netdev_priv(dev);
 452
 453	/*
 454         *      Once the card has the firmware loaded and has acquired
 455         *      the nodeid, if it is reset it will lose it all.
 456         */
 457        cops_reset(dev,1);	/* Need to reset card before load firmware. */
 458        cops_load(dev);		/* Load the firmware. */
 459
 460	/*
 461	 *	If atalkd already gave us a nodeid we will use that
 462	 *	one again, else we wait for atalkd to give us a nodeid
 463	 *	in cops_ioctl. This may cause a problem if someone steals
 464	 *	our nodeid while we are resetting.
 465	 */	
 466	if(lp->nodeid == 1)
 467		cops_nodeid(dev,lp->node_acquire);
 468
 469	return 0;
 470}
 471
 472static void tangent_wait_reset(int ioaddr)
 473{
 474	int timeout=0;
 475
 476	while(timeout++ < 5 && (inb(ioaddr+TANG_CARD_STATUS)&TANG_TX_READY)==0)
 477		mdelay(1);   /* Wait 1 second */
 478}
 479
 480/*
 481 *      Reset the LocalTalk board.
 482 */
 483static void cops_reset(struct net_device *dev, int sleep)
 484{
 485        struct cops_local *lp = netdev_priv(dev);
 486        int ioaddr=dev->base_addr;
 487
 488        if(lp->board==TANGENT)
 489        {
 490                inb(ioaddr);		/* Clear request latch. */
 491                outb(0,ioaddr);		/* Clear the TANG_TX_READY flop. */
 492                outb(0, ioaddr+TANG_RESET);	/* Reset the adapter. */
 493
 494		tangent_wait_reset(ioaddr);
 495                outb(0, ioaddr+TANG_CLEAR_INT);
 496        }
 497        if(lp->board==DAYNA)
 498        {
 499                outb(0, ioaddr+DAYNA_RESET);	/* Assert the reset port */
 500                inb(ioaddr+DAYNA_RESET);	/* Clear the reset */
 501		if (sleep)
 502			msleep(333);
 503		else
 504			mdelay(333);
 505        }
 506
 507	netif_wake_queue(dev);
 508}
 509
 510static void cops_load (struct net_device *dev)
 511{
 512        struct ifreq ifr;
 513        struct ltfirmware *ltf= (struct ltfirmware *)&ifr.ifr_ifru;
 514        struct cops_local *lp = netdev_priv(dev);
 515        int ioaddr=dev->base_addr;
 516	int length, i = 0;
 517
 518        strcpy(ifr.ifr_name,"lt0");
 519
 520        /* Get card's firmware code and do some checks on it. */
 521#ifdef CONFIG_COPS_DAYNA        
 522        if(lp->board==DAYNA)
 523        {
 524                ltf->length=sizeof(ffdrv_code);
 525                ltf->data=ffdrv_code;
 526        }
 527        else
 528#endif        
 529#ifdef CONFIG_COPS_TANGENT
 530        if(lp->board==TANGENT)
 531        {
 532                ltf->length=sizeof(ltdrv_code);
 533                ltf->data=ltdrv_code;
 534        }
 535        else
 536#endif
 537	{
 538		printk(KERN_INFO "%s; unsupported board type.\n", dev->name);
 539		return;
 540	}
 541	
 542        /* Check to make sure firmware is correct length. */
 543        if(lp->board==DAYNA && ltf->length!=5983)
 544        {
 545                printk(KERN_WARNING "%s: Firmware is not length of FFDRV.BIN.\n", dev->name);
 546                return;
 547        }
 548        if(lp->board==TANGENT && ltf->length!=2501)
 549        {
 550                printk(KERN_WARNING "%s: Firmware is not length of DRVCODE.BIN.\n", dev->name);
 551                return;
 552        }
 553
 554        if(lp->board==DAYNA)
 555        {
 556                /*
 557                 *      We must wait for a status response
 558                 *      with the DAYNA board.
 559                 */
 560                while(++i<65536)
 561                {
 562                       if((inb(ioaddr+DAYNA_CARD_STATUS)&3)==1)
 563                                break;
 564                }
 565
 566                if(i==65536)
 567                        return;
 568        }
 569
 570        /*
 571         *      Upload the firmware and kick. Byte-by-byte works nicely here.
 572         */
 573	i=0;
 574        length = ltf->length;
 575        while(length--)
 576        {
 577                outb(ltf->data[i], ioaddr);
 578                i++;
 579        }
 580
 581	if(cops_debug > 1)
 582		printk("%s: Uploaded firmware - %d bytes of %d bytes.\n", 
 583			dev->name, i, ltf->length);
 584
 585        if(lp->board==DAYNA) 	/* Tell Dayna to run the firmware code. */
 586                outb(1, ioaddr+DAYNA_INT_CARD);
 587	else			/* Tell Tang to run the firmware code. */
 588		inb(ioaddr);
 589
 590        if(lp->board==TANGENT)
 591        {
 592                tangent_wait_reset(ioaddr);
 593                inb(ioaddr);	/* Clear initial ready signal. */
 594        }
 595}
 596
 597/*
 598 * 	Get the LocalTalk Nodeid from the card. We can suggest
 599 *	any nodeid 1-254. The card will try and get that exact
 600 *	address else we can specify 0 as the nodeid and the card
 601 *	will autoprobe for a nodeid.
 602 */
 603static int cops_nodeid (struct net_device *dev, int nodeid)
 604{
 605	struct cops_local *lp = netdev_priv(dev);
 606	int ioaddr = dev->base_addr;
 607
 608	if(lp->board == DAYNA)
 609        {
 610        	/* Empty any pending adapter responses. */
 611                while((inb(ioaddr+DAYNA_CARD_STATUS)&DAYNA_TX_READY)==0)
 612                {
 613			outb(0, ioaddr+COPS_CLEAR_INT);	/* Clear interrupts. */
 614        		if((inb(ioaddr+DAYNA_CARD_STATUS)&0x03)==DAYNA_RX_REQUEST)
 615                		cops_rx(dev);	/* Kick any packets waiting. */
 616			schedule();
 617                }
 618
 619                outb(2, ioaddr);       	/* Output command packet length as 2. */
 620                outb(0, ioaddr);
 621                outb(LAP_INIT, ioaddr);	/* Send LAP_INIT command byte. */
 622                outb(nodeid, ioaddr);  	/* Suggest node address. */
 623        }
 624
 625	if(lp->board == TANGENT)
 626        {
 627                /* Empty any pending adapter responses. */
 628                while(inb(ioaddr+TANG_CARD_STATUS)&TANG_RX_READY)
 629                {
 630			outb(0, ioaddr+COPS_CLEAR_INT);	/* Clear interrupt. */
 631                	cops_rx(dev);          	/* Kick out packets waiting. */
 632			schedule();
 633                }
 634
 635		/* Not sure what Tangent does if nodeid picked is used. */
 636                if(nodeid == 0)	         		/* Seed. */
 637                	nodeid = jiffies&0xFF;		/* Get a random try */
 638                outb(2, ioaddr);        		/* Command length LSB */
 639                outb(0, ioaddr);       			/* Command length MSB */
 640                outb(LAP_INIT, ioaddr); 		/* Send LAP_INIT byte */
 641                outb(nodeid, ioaddr); 		  	/* LAP address hint. */
 642                outb(0xFF, ioaddr);     		/* Int. level to use */
 643        }
 644
 645	lp->node_acquire=0;		/* Set nodeid holder to 0. */
 646        while(lp->node_acquire==0)	/* Get *True* nodeid finally. */
 647	{
 648		outb(0, ioaddr+COPS_CLEAR_INT);	/* Clear any interrupt. */
 649
 650		if(lp->board == DAYNA)
 651		{
 652                	if((inb(ioaddr+DAYNA_CARD_STATUS)&0x03)==DAYNA_RX_REQUEST)
 653                		cops_rx(dev);	/* Grab the nodeid put in lp->node_acquire. */
 654		}
 655		if(lp->board == TANGENT)
 656		{	
 657			if(inb(ioaddr+TANG_CARD_STATUS)&TANG_RX_READY)
 658                                cops_rx(dev);   /* Grab the nodeid put in lp->node_acquire. */
 659		}
 660		schedule();
 661	}
 662
 663	if(cops_debug > 1)
 664		printk(KERN_DEBUG "%s: Node ID %d has been acquired.\n", 
 665			dev->name, lp->node_acquire);
 666
 667	lp->nodeid=1;	/* Set got nodeid to 1. */
 668
 669        return 0;
 670}
 671
 672/*
 673 *	Poll the Tangent type cards to see if we have work.
 674 */
 675 
 676static void cops_poll(struct timer_list *unused)
 677{
 678	int ioaddr, status;
 679	int boguscount = 0;
 680	struct net_device *dev = cops_timer_dev;
 681
 682	del_timer(&cops_timer);
 683
 684	if(dev == NULL)
 685		return;	/* We've been downed */
 686
 687	ioaddr = dev->base_addr;
 688	do {
 689		status=inb(ioaddr+TANG_CARD_STATUS);
 690		if(status & TANG_RX_READY)
 691			cops_rx(dev);
 692		if(status & TANG_TX_READY)
 693			netif_wake_queue(dev);
 694		status = inb(ioaddr+TANG_CARD_STATUS);
 695	} while((++boguscount < 20) && (status&(TANG_RX_READY|TANG_TX_READY)));
 696
 697	/* poll 20 times per second */
 698	cops_timer.expires = jiffies + HZ/20;
 699	add_timer(&cops_timer);
 700}
 701
 702/*
 703 *      The typical workload of the driver:
 704 *      Handle the network interface interrupts.
 705 */
 706static irqreturn_t cops_interrupt(int irq, void *dev_id)
 707{
 708        struct net_device *dev = dev_id;
 709        struct cops_local *lp;
 710        int ioaddr, status;
 711        int boguscount = 0;
 712
 713        ioaddr = dev->base_addr;
 714        lp = netdev_priv(dev);
 715
 716	if(lp->board==DAYNA)
 717	{
 718		do {
 719			outb(0, ioaddr + COPS_CLEAR_INT);
 720                       	status=inb(ioaddr+DAYNA_CARD_STATUS);
 721                       	if((status&0x03)==DAYNA_RX_REQUEST)
 722                       	        cops_rx(dev);
 723                	netif_wake_queue(dev);
 724		} while(++boguscount < 20);
 725	}
 726	else
 727	{
 728		do {
 729                       	status=inb(ioaddr+TANG_CARD_STATUS);
 730			if(status & TANG_RX_READY)
 731				cops_rx(dev);
 732			if(status & TANG_TX_READY)
 733				netif_wake_queue(dev);
 734			status=inb(ioaddr+TANG_CARD_STATUS);
 735		} while((++boguscount < 20) && (status&(TANG_RX_READY|TANG_TX_READY)));
 736	}
 737
 738        return IRQ_HANDLED;
 739}
 740
 741/*
 742 *      We have a good packet(s), get it/them out of the buffers.
 743 */
 744static void cops_rx(struct net_device *dev)
 745{
 746        int pkt_len = 0;
 747        int rsp_type = 0;
 748        struct sk_buff *skb = NULL;
 749        struct cops_local *lp = netdev_priv(dev);
 750        int ioaddr = dev->base_addr;
 751        int boguscount = 0;
 752        unsigned long flags;
 753
 754
 755	spin_lock_irqsave(&lp->lock, flags);
 756	
 757        if(lp->board==DAYNA)
 758        {
 759                outb(0, ioaddr);                /* Send out Zero length. */
 760                outb(0, ioaddr);
 761                outb(DATA_READ, ioaddr);        /* Send read command out. */
 762
 763                /* Wait for DMA to turn around. */
 764                while(++boguscount<1000000)
 765                {
 766			barrier();
 767                        if((inb(ioaddr+DAYNA_CARD_STATUS)&0x03)==DAYNA_RX_READY)
 768                                break;
 769                }
 770
 771                if(boguscount==1000000)
 772                {
 773                        printk(KERN_WARNING "%s: DMA timed out.\n",dev->name);
 774			spin_unlock_irqrestore(&lp->lock, flags);
 775                        return;
 776                }
 777        }
 778
 779        /* Get response length. */
 780	pkt_len = inb(ioaddr);
 781        pkt_len |= (inb(ioaddr) << 8);
 782        /* Input IO code. */
 783        rsp_type=inb(ioaddr);
 784
 785        /* Malloc up new buffer. */
 786        skb = dev_alloc_skb(pkt_len);
 787        if(skb == NULL)
 788        {
 789                printk(KERN_WARNING "%s: Memory squeeze, dropping packet.\n",
 790			dev->name);
 791                dev->stats.rx_dropped++;
 792                while(pkt_len--)        /* Discard packet */
 793                        inb(ioaddr);
 794                spin_unlock_irqrestore(&lp->lock, flags);
 795                return;
 796        }
 797        skb->dev = dev;
 798        skb_put(skb, pkt_len);
 799        skb->protocol = htons(ETH_P_LOCALTALK);
 800
 801        insb(ioaddr, skb->data, pkt_len);               /* Eat the Data */
 802
 803        if(lp->board==DAYNA)
 804                outb(1, ioaddr+DAYNA_INT_CARD);         /* Interrupt the card */
 805
 806        spin_unlock_irqrestore(&lp->lock, flags);  /* Restore interrupts. */
 807
 808        /* Check for bad response length */
 809        if(pkt_len < 0 || pkt_len > MAX_LLAP_SIZE)
 810        {
 811		printk(KERN_WARNING "%s: Bad packet length of %d bytes.\n", 
 812			dev->name, pkt_len);
 813                dev->stats.tx_errors++;
 814                dev_kfree_skb_any(skb);
 815                return;
 816        }
 817
 818        /* Set nodeid and then get out. */
 819        if(rsp_type == LAP_INIT_RSP)
 820        {	/* Nodeid taken from received packet. */
 821                lp->node_acquire = skb->data[0];
 822                dev_kfree_skb_any(skb);
 823                return;
 824        }
 825
 826        /* One last check to make sure we have a good packet. */
 827        if(rsp_type != LAP_RESPONSE)
 828        {
 829                printk(KERN_WARNING "%s: Bad packet type %d.\n", dev->name, rsp_type);
 830                dev->stats.tx_errors++;
 831                dev_kfree_skb_any(skb);
 832                return;
 833        }
 834
 835        skb_reset_mac_header(skb);    /* Point to entire packet. */
 836        skb_pull(skb,3);
 837        skb_reset_transport_header(skb);    /* Point to data (Skip header). */
 838
 839        /* Update the counters. */
 840        dev->stats.rx_packets++;
 841        dev->stats.rx_bytes += skb->len;
 842
 843        /* Send packet to a higher place. */
 844        netif_rx(skb);
 845}
 846
 847static void cops_timeout(struct net_device *dev, unsigned int txqueue)
 848{
 849        struct cops_local *lp = netdev_priv(dev);
 850        int ioaddr = dev->base_addr;
 851
 852	dev->stats.tx_errors++;
 853        if(lp->board==TANGENT)
 854        {
 855		if((inb(ioaddr+TANG_CARD_STATUS)&TANG_TX_READY)==0)
 856               		printk(KERN_WARNING "%s: No TX complete interrupt.\n", dev->name);
 857	}
 858	printk(KERN_WARNING "%s: Transmit timed out.\n", dev->name);
 859	cops_jumpstart(dev);	/* Restart the card. */
 860	netif_trans_update(dev); /* prevent tx timeout */
 861	netif_wake_queue(dev);
 862}
 863
 864
 865/*
 866 *	Make the card transmit a LocalTalk packet.
 867 */
 868
 869static netdev_tx_t cops_send_packet(struct sk_buff *skb,
 870					  struct net_device *dev)
 871{
 872        struct cops_local *lp = netdev_priv(dev);
 873        int ioaddr = dev->base_addr;
 874        unsigned long flags;
 875
 876        /*
 877         * Block a timer-based transmit from overlapping. 
 878	 */
 879	 
 880	netif_stop_queue(dev);
 881
 882	spin_lock_irqsave(&lp->lock, flags);
 883	if(lp->board == DAYNA)	 /* Wait for adapter transmit buffer. */
 884		while((inb(ioaddr+DAYNA_CARD_STATUS)&DAYNA_TX_READY)==0)
 885			cpu_relax();
 886	if(lp->board == TANGENT) /* Wait for adapter transmit buffer. */
 887		while((inb(ioaddr+TANG_CARD_STATUS)&TANG_TX_READY)==0)
 888			cpu_relax();
 889
 890	/* Output IO length. */
 891	outb(skb->len, ioaddr);
 892	outb(skb->len >> 8, ioaddr);
 893
 894	/* Output IO code. */
 895	outb(LAP_WRITE, ioaddr);
 896
 897	if(lp->board == DAYNA)	/* Check the transmit buffer again. */
 898        	while((inb(ioaddr+DAYNA_CARD_STATUS)&DAYNA_TX_READY)==0);
 899
 900	outsb(ioaddr, skb->data, skb->len);	/* Send out the data. */
 901
 902	if(lp->board==DAYNA)	/* Dayna requires you kick the card */
 903		outb(1, ioaddr+DAYNA_INT_CARD);
 904
 905	spin_unlock_irqrestore(&lp->lock, flags);	/* Restore interrupts. */
 906
 907	/* Done sending packet, update counters and cleanup. */
 908	dev->stats.tx_packets++;
 909	dev->stats.tx_bytes += skb->len;
 910	dev_kfree_skb (skb);
 911	return NETDEV_TX_OK;
 912}
 913
 914/*
 915 *	Dummy function to keep the Appletalk layer happy.
 916 */
 917 
 918static void set_multicast_list(struct net_device *dev)
 919{
 920        if(cops_debug >= 3)
 921		printk("%s: set_multicast_list executed\n", dev->name);
 922}
 923
 924/*
 925 *      System ioctls for the COPS LocalTalk card.
 926 */
 927 
 928static int cops_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 929{
 930        struct cops_local *lp = netdev_priv(dev);
 931        struct sockaddr_at *sa = (struct sockaddr_at *)&ifr->ifr_addr;
 932        struct atalk_addr *aa = &lp->node_addr;
 933
 934        switch(cmd)
 935        {
 936                case SIOCSIFADDR:
 937			/* Get and set the nodeid and network # atalkd wants. */
 938			cops_nodeid(dev, sa->sat_addr.s_node);
 939			aa->s_net               = sa->sat_addr.s_net;
 940                        aa->s_node              = lp->node_acquire;
 941
 942			/* Set broardcast address. */
 943                        dev->broadcast[0]       = 0xFF;
 944			
 945			/* Set hardware address. */
 946                        dev->dev_addr[0]        = aa->s_node;
 947                        dev->addr_len           = 1;
 948                        return 0;
 949
 950                case SIOCGIFADDR:
 951                        sa->sat_addr.s_net      = aa->s_net;
 952                        sa->sat_addr.s_node     = aa->s_node;
 953                        return 0;
 954
 955                default:
 956                        return -EOPNOTSUPP;
 957        }
 958}
 959
 960/*
 961 *	The inverse routine to cops_open().
 962 */
 963 
 964static int cops_close(struct net_device *dev)
 965{
 966	struct cops_local *lp = netdev_priv(dev);
 967
 968	/* If we were running polled, yank the timer.
 969	 */
 970	if(lp->board==TANGENT && dev->irq==0)
 971		del_timer(&cops_timer);
 972
 973	netif_stop_queue(dev);
 974        return 0;
 975}
 976
 977
 978#ifdef MODULE
 979static struct net_device *cops_dev;
 980
 981MODULE_LICENSE("GPL");
 982module_param_hw(io, int, ioport, 0);
 983module_param_hw(irq, int, irq, 0);
 984module_param_hw(board_type, int, other, 0);
 985
 986static int __init cops_module_init(void)
 987{
 988	if (io == 0)
 989		printk(KERN_WARNING "%s: You shouldn't autoprobe with insmod\n",
 990			cardname);
 991	cops_dev = cops_probe(-1);
 992	return PTR_ERR_OR_ZERO(cops_dev);
 993}
 994
 995static void __exit cops_module_exit(void)
 996{
 997	unregister_netdev(cops_dev);
 998	cleanup_card(cops_dev);
 999	free_netdev(cops_dev);
1000}
1001module_init(cops_module_init);
1002module_exit(cops_module_exit);
1003#endif /* MODULE */