aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/appletalk/cops.c
blob: 9abd4eb86dc1bf7a38b692657696062f8dc7e974 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
/*      cops.c: LocalTalk driver for Linux.
 *
 *	Authors:
 *      - Jay Schulist <jschlst@samba.org>
 *
 *	With more than a little help from;
 *	- Alan Cox <alan@lxorguk.ukuu.org.uk>
 *
 *      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/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/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>
#include <linux/delay.h>	/* For udelay() */
#include <linux/atalk.h>
#include <linux/spinlock.h>
#include <linux/bitops.h>
#include <linux/jiffies.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 unknown 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
{
        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);
static void cops_poll (unsigned long ltdev);
static void cops_timeout(struct net_device *dev);
static void cops_rx (struct net_device *dev);
static netdev_tx_t  cops_send_packet (struct sk_buff *skb,
					    struct net_device *dev);
static void set_multicast_list (struct net_device *dev);
static int  cops_ioctl (struct net_device *dev, struct ifreq *rq, int cmd);
static int  cops_close (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_ltalkdev(sizeof(struct cops_local));
	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;
	}

	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);
}

static const struct net_device_ops cops_netdev_ops = {
	.ndo_open               = cops_open,
        .ndo_stop               = cops_close,
	.ndo_start_xmit   	= cops_send_packet,
	.ndo_tx_timeout		= cops_timeout,
        .ndo_do_ioctl           = cops_ioctl,
	.ndo_set_rx_mode	= set_multicast_list,
};

/*
 *      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);
        spin_lock_init(&lp->lock);

	/* Copy local board variable to lp struct. */
	lp->board               = board;

	dev->netdev_ops 	= &cops_netdev_ops;
	dev->watchdog_timeo	= HZ * 2;


	/* 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)
			msleep(333);
		else
			mdelay(333);
        }

	netif_wake_queue(dev);
}

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. */
        }
}

/*
 * 	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);
}

/*
 *      The typical workload of the driver:
 *      Handle the network interface interrupts.
 */
static irqreturn_t cops_interrupt(int irq, void *dev_id)
{
        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);
                dev->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);
                dev->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);
                dev->stats.tx_errors++;
                dev_kfree_skb_any(skb);
                return;
        }

        skb_reset_mac_header(skb);    /* Point to entire packet. */
        skb_pull(skb,3);
        skb_reset_transport_header(skb);    /* Point to data (Skip header). */

        /* Update the counters. */
        dev->stats.rx_packets++;
        dev->stats.rx_bytes += skb->len;

        /* Send packet to a higher place. */
        netif_rx(skb);
}

static void cops_timeout(struct net_device *dev)
{
        struct cops_local *lp = netdev_priv(dev);
        int ioaddr = dev->base_addr;

	dev->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; /* prevent tx timeout */
	netif_wake_queue(dev);
}


/*
 *	Make the card transmit a LocalTalk packet.
 */

static netdev_tx_t 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. */
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
	dev_kfree_skb (skb);
	return NETDEV_TX_OK;
}

/*
 *	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);
}

/*
 *      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;
}


#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);

static int __init cops_module_init(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;
}

static void __exit cops_module_exit(void)
{
	unregister_netdev(cops_dev);
	cleanup_card(cops_dev);
	free_netdev(cops_dev);
}
module_init(cops_module_init);
module_exit(cops_module_exit);
#endif /* MODULE */