summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/seeq/ether3.c
blob: 3aca57853ed470034d46e9eb01a848b761fbec28 (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
/*
 *  linux/drivers/acorn/net/ether3.c
 *
 *  Copyright (C) 1995-2000 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * SEEQ nq8005 ethernet driver for Acorn/ANT Ether3 card
 *  for Acorn machines
 *
 * By Russell King, with some suggestions from borris@ant.co.uk
 *
 * Changelog:
 * 1.04	RMK	29/02/1996	Won't pass packets that are from our ethernet
 *				address up to the higher levels - they're
 *				silently ignored.  I/F can now be put into
 *				multicast mode.  Receiver routine optimised.
 * 1.05	RMK	30/02/1996	Now claims interrupt at open when part of
 *				the kernel rather than when a module.
 * 1.06	RMK	02/03/1996	Various code cleanups
 * 1.07	RMK	13/10/1996	Optimised interrupt routine and transmit
 *				routines.
 * 1.08	RMK	14/10/1996	Fixed problem with too many packets,
 *				prevented the kernel message about dropped
 *				packets appearing too many times a second.
 *				Now does not disable all IRQs, only the IRQ
 *				used by this card.
 * 1.09	RMK	10/11/1996	Only enables TX irq when buffer space is low,
 *				but we still service the TX queue if we get a
 *				RX interrupt.
 * 1.10	RMK	15/07/1997	Fixed autoprobing of NQ8004.
 * 1.11	RMK	16/11/1997	Fixed autoprobing of NQ8005A.
 * 1.12	RMK	31/12/1997	Removed reference to dev_tint for Linux 2.1.
 *      RMK	27/06/1998	Changed asm/delay.h to linux/delay.h.
 * 1.13	RMK	29/06/1998	Fixed problem with transmission of packets.
 *				Chip seems to have a bug in, whereby if the
 *				packet starts two bytes from the end of the
 *				buffer, it corrupts the receiver chain, and
 *				never updates the transmit status correctly.
 * 1.14	RMK	07/01/1998	Added initial code for ETHERB addressing.
 * 1.15	RMK	30/04/1999	More fixes to the transmit routine for buggy
 *				hardware.
 * 1.16	RMK	10/02/2000	Updated for 2.3.43
 * 1.17	RMK	13/05/2000	Updated for 2.3.99-pre8
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/bitops.h>

#include <asm/ecard.h>
#include <asm/io.h>

static char version[] = "ether3 ethernet driver (c) 1995-2000 R.M.King v1.17\n";

#include "ether3.h"

static unsigned int net_debug = NET_DEBUG;

static void	ether3_setmulticastlist(struct net_device *dev);
static int	ether3_rx(struct net_device *dev, unsigned int maxcnt);
static void	ether3_tx(struct net_device *dev);
static int	ether3_open (struct net_device *dev);
static int	ether3_sendpacket (struct sk_buff *skb, struct net_device *dev);
static irqreturn_t ether3_interrupt (int irq, void *dev_id);
static int	ether3_close (struct net_device *dev);
static void	ether3_setmulticastlist (struct net_device *dev);
static void	ether3_timeout(struct net_device *dev);

#define BUS_16		2
#define BUS_8		1
#define BUS_UNKNOWN	0

/* --------------------------------------------------------------------------- */

typedef enum {
	buffer_write,
	buffer_read
} buffer_rw_t;

/*
 * ether3 read/write.  Slow things down a bit...
 * The SEEQ8005 doesn't like us writing to its registers
 * too quickly.
 */
static inline void ether3_outb(int v, void __iomem *r)
{
	writeb(v, r);
	udelay(1);
}

static inline void ether3_outw(int v, void __iomem *r)
{
	writew(v, r);
	udelay(1);
}
#define ether3_inb(r)		({ unsigned int __v = readb((r)); udelay(1); __v; })
#define ether3_inw(r)		({ unsigned int __v = readw((r)); udelay(1); __v; })

static int
ether3_setbuffer(struct net_device *dev, buffer_rw_t read, int start)
{
	int timeout = 1000;

	ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
	ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);

	while ((ether3_inw(REG_STATUS) & STAT_FIFOEMPTY) == 0) {
		if (!timeout--) {
			printk("%s: setbuffer broken\n", dev->name);
			priv(dev)->broken = 1;
			return 1;
		}
		udelay(1);
	}

	if (read == buffer_read) {
		ether3_outw(start, REG_DMAADDR);
		ether3_outw(priv(dev)->regs.command | CMD_FIFOREAD, REG_COMMAND);
	} else {
		ether3_outw(priv(dev)->regs.command | CMD_FIFOWRITE, REG_COMMAND);
		ether3_outw(start, REG_DMAADDR);
	}
	return 0;
}

/*
 * write data to the buffer memory
 */
#define ether3_writebuffer(dev,data,length)			\
	writesw(REG_BUFWIN, (data), (length) >> 1)

#define ether3_writeword(dev,data)				\
	writew((data), REG_BUFWIN)

#define ether3_writelong(dev,data)	{			\
	void __iomem *reg_bufwin = REG_BUFWIN;			\
	writew((data), reg_bufwin);				\
	writew((data) >> 16, reg_bufwin);			\
}

/*
 * read data from the buffer memory
 */
#define ether3_readbuffer(dev,data,length)			\
	readsw(REG_BUFWIN, (data), (length) >> 1)

#define ether3_readword(dev)					\
	readw(REG_BUFWIN)

#define ether3_readlong(dev)	 				\
	readw(REG_BUFWIN) | (readw(REG_BUFWIN) << 16)

/*
 * Switch LED off...
 */
static void ether3_ledoff(unsigned long data)
{
	struct net_device *dev = (struct net_device *)data;
	ether3_outw(priv(dev)->regs.config2 |= CFG2_CTRLO, REG_CONFIG2);
}

/*
 * switch LED on...
 */
static inline void ether3_ledon(struct net_device *dev)
{
	del_timer(&priv(dev)->timer);
	priv(dev)->timer.expires = jiffies + HZ / 50; /* leave on for 1/50th second */
	priv(dev)->timer.data = (unsigned long)dev;
	priv(dev)->timer.function = ether3_ledoff;
	add_timer(&priv(dev)->timer);
	if (priv(dev)->regs.config2 & CFG2_CTRLO)
		ether3_outw(priv(dev)->regs.config2 &= ~CFG2_CTRLO, REG_CONFIG2);
}

/*
 * Read the ethernet address string from the on board rom.
 * This is an ascii string!!!
 */
static int
ether3_addr(char *addr, struct expansion_card *ec)
{
	struct in_chunk_dir cd;
	char *s;
	
	if (ecard_readchunk(&cd, ec, 0xf5, 0) && (s = strchr(cd.d.string, '('))) {
		int i;
		for (i = 0; i<6; i++) {
			addr[i] = simple_strtoul(s + 1, &s, 0x10);
			if (*s != (i==5?')' : ':' ))
				break;
		}
		if (i == 6)
			return 0;
	}
	/* I wonder if we should even let the user continue in this case
	 *   - no, it would be better to disable the device
	 */
	printk(KERN_ERR "ether3: Couldn't read a valid MAC address from card.\n");
	return -ENODEV;
}

/* --------------------------------------------------------------------------- */

static int
ether3_ramtest(struct net_device *dev, unsigned char byte)
{
	unsigned char *buffer = kmalloc(RX_END, GFP_KERNEL);
	int i,ret = 0;
	int max_errors = 4;
	int bad = -1;

	if (!buffer)
		return 1;

	memset(buffer, byte, RX_END);
	ether3_setbuffer(dev, buffer_write, 0);
	ether3_writebuffer(dev, buffer, TX_END);
	ether3_setbuffer(dev, buffer_write, RX_START);
	ether3_writebuffer(dev, buffer + RX_START, RX_LEN);
	memset(buffer, byte ^ 0xff, RX_END);
	ether3_setbuffer(dev, buffer_read, 0);
	ether3_readbuffer(dev, buffer, TX_END);
	ether3_setbuffer(dev, buffer_read, RX_START);
	ether3_readbuffer(dev, buffer + RX_START, RX_LEN);

	for (i = 0; i < RX_END; i++) {
		if (buffer[i] != byte) {
			if (max_errors > 0 && bad != buffer[i]) {
				printk("%s: RAM failed with (%02X instead of %02X) at 0x%04X",
				       dev->name, buffer[i], byte, i);
				ret = 2;
				max_errors--;
				bad = i;
			}
		} else {
			if (bad != -1) {
				if (bad != i - 1)
					printk(" - 0x%04X\n", i - 1);
				printk("\n");
				bad = -1;
			}
		}
	}
	if (bad != -1)
		printk(" - 0xffff\n");
	kfree(buffer);

	return ret;
}

/* ------------------------------------------------------------------------------- */

static int ether3_init_2(struct net_device *dev)
{
	int i;

	priv(dev)->regs.config1 = CFG1_RECVCOMPSTAT0|CFG1_DMABURST8;
	priv(dev)->regs.config2 = CFG2_CTRLO|CFG2_RECVCRC|CFG2_ERRENCRC;
	priv(dev)->regs.command = 0;

	/*
	 * Set up our hardware address
	 */
	ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
	for (i = 0; i < 6; i++)
		ether3_outb(dev->dev_addr[i], REG_BUFWIN);

	if (dev->flags & IFF_PROMISC)
		priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
	else if (dev->flags & IFF_MULTICAST)
		priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
	else
		priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;

	/*
	 * There is a problem with the NQ8005 in that it occasionally loses the
	 * last two bytes.  To get round this problem, we receive the CRC as
	 * well.  That way, if we do lose the last two, then it doesn't matter.
	 */
	ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
	ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
	ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
	ether3_outw(0, REG_TRANSMITPTR);
	ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
	ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
	ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
	ether3_outw(priv(dev)->regs.command, REG_COMMAND);

	i = ether3_ramtest(dev, 0x5A);
	if(i)
		return i;
	i = ether3_ramtest(dev, 0x1E);
	if(i)
		return i;

	ether3_setbuffer(dev, buffer_write, 0);
	ether3_writelong(dev, 0);
	return 0;
}

static void
ether3_init_for_open(struct net_device *dev)
{
	int i;

	/* Reset the chip */
	ether3_outw(CFG2_RESET, REG_CONFIG2);
	udelay(4);

	priv(dev)->regs.command = 0;
	ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
	while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
		barrier();

	ether3_outw(priv(dev)->regs.config1 | CFG1_BUFSELSTAT0, REG_CONFIG1);
	for (i = 0; i < 6; i++)
		ether3_outb(dev->dev_addr[i], REG_BUFWIN);

	priv(dev)->tx_head	= 0;
	priv(dev)->tx_tail	= 0;
	priv(dev)->regs.config2 |= CFG2_CTRLO;
	priv(dev)->rx_head	= RX_START;

	ether3_outw(priv(dev)->regs.config1 | CFG1_TRANSEND, REG_CONFIG1);
	ether3_outw((TX_END>>8) - 1, REG_BUFWIN);
	ether3_outw(priv(dev)->rx_head, REG_RECVPTR);
	ether3_outw(priv(dev)->rx_head >> 8, REG_RECVEND);
	ether3_outw(0, REG_TRANSMITPTR);
	ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
	ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);

	ether3_setbuffer(dev, buffer_write, 0);
	ether3_writelong(dev, 0);

	priv(dev)->regs.command = CMD_ENINTRX | CMD_ENINTTX;
	ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
}

static inline int
ether3_probe_bus_8(struct net_device *dev, int val)
{
	int write_low, write_high, read_low, read_high;

	write_low = val & 255;
	write_high = val >> 8;

	printk(KERN_DEBUG "ether3_probe: write8 [%02X:%02X]", write_high, write_low);

	ether3_outb(write_low, REG_RECVPTR);
	ether3_outb(write_high, REG_RECVPTR + 4);

	read_low = ether3_inb(REG_RECVPTR);
	read_high = ether3_inb(REG_RECVPTR + 4);

	printk(", read8 [%02X:%02X]\n", read_high, read_low);

	return read_low == write_low && read_high == write_high;
}

static inline int
ether3_probe_bus_16(struct net_device *dev, int val)
{
	int read_val;

	ether3_outw(val, REG_RECVPTR);
	read_val = ether3_inw(REG_RECVPTR);

	printk(KERN_DEBUG "ether3_probe: write16 [%04X], read16 [%04X]\n", val, read_val);

	return read_val == val;
}

/*
 * Open/initialize the board.  This is called (in the current kernel)
 * sometime after booting when the 'ifconfig' program is run.
 *
 * This routine should set everything up anew at each open, even
 * registers that "should" only need to be set once at boot, so that
 * there is non-reboot way to recover if something goes wrong.
 */
static int
ether3_open(struct net_device *dev)
{
	if (request_irq(dev->irq, ether3_interrupt, 0, "ether3", dev))
		return -EAGAIN;

	ether3_init_for_open(dev);

	netif_start_queue(dev);

	return 0;
}

/*
 * The inverse routine to ether3_open().
 */
static int
ether3_close(struct net_device *dev)
{
	netif_stop_queue(dev);

	disable_irq(dev->irq);

	ether3_outw(CMD_RXOFF|CMD_TXOFF, REG_COMMAND);
	priv(dev)->regs.command = 0;
	while (ether3_inw(REG_STATUS) & (STAT_RXON|STAT_TXON))
		barrier();
	ether3_outb(0x80, REG_CONFIG2 + 4);
	ether3_outw(0, REG_COMMAND);

	free_irq(dev->irq, dev);

	return 0;
}

/*
 * Set or clear promiscuous/multicast mode filter for this adaptor.
 *
 * We don't attempt any packet filtering.  The card may have a SEEQ 8004
 * in which does not have the other ethernet address registers present...
 */
static void ether3_setmulticastlist(struct net_device *dev)
{
	priv(dev)->regs.config1 &= ~CFG1_RECVPROMISC;

	if (dev->flags & IFF_PROMISC) {
		/* promiscuous mode */
		priv(dev)->regs.config1 |= CFG1_RECVPROMISC;
	} else if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev)) {
		priv(dev)->regs.config1 |= CFG1_RECVSPECBRMULTI;
	} else
		priv(dev)->regs.config1 |= CFG1_RECVSPECBROAD;

	ether3_outw(priv(dev)->regs.config1 | CFG1_LOCBUFMEM, REG_CONFIG1);
}

static void ether3_timeout(struct net_device *dev)
{
	unsigned long flags;

	del_timer(&priv(dev)->timer);

	local_irq_save(flags);
	printk(KERN_ERR "%s: transmit timed out, network cable problem?\n", dev->name);
	printk(KERN_ERR "%s: state: { status=%04X cfg1=%04X cfg2=%04X }\n", dev->name,
		ether3_inw(REG_STATUS), ether3_inw(REG_CONFIG1), ether3_inw(REG_CONFIG2));
	printk(KERN_ERR "%s: { rpr=%04X rea=%04X tpr=%04X }\n", dev->name,
		ether3_inw(REG_RECVPTR), ether3_inw(REG_RECVEND), ether3_inw(REG_TRANSMITPTR));
	printk(KERN_ERR "%s: tx head=%X tx tail=%X\n", dev->name,
		priv(dev)->tx_head, priv(dev)->tx_tail);
	ether3_setbuffer(dev, buffer_read, priv(dev)->tx_tail);
	printk(KERN_ERR "%s: packet status = %08X\n", dev->name, ether3_readlong(dev));
	local_irq_restore(flags);

	priv(dev)->regs.config2 |= CFG2_CTRLO;
	dev->stats.tx_errors += 1;
	ether3_outw(priv(dev)->regs.config2, REG_CONFIG2);
	priv(dev)->tx_head = priv(dev)->tx_tail = 0;

	netif_wake_queue(dev);
}

/*
 * Transmit a packet
 */
static int
ether3_sendpacket(struct sk_buff *skb, struct net_device *dev)
{
	unsigned long flags;
	unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
	unsigned int ptr, next_ptr;

	if (priv(dev)->broken) {
		dev_kfree_skb(skb);
		dev->stats.tx_dropped++;
		netif_start_queue(dev);
		return NETDEV_TX_OK;
	}

	length = (length + 1) & ~1;
	if (length != skb->len) {
		if (skb_padto(skb, length))
			goto out;
	}

	next_ptr = (priv(dev)->tx_head + 1) & 15;

	local_irq_save(flags);

	if (priv(dev)->tx_tail == next_ptr) {
		local_irq_restore(flags);
		return NETDEV_TX_BUSY;	/* unable to queue */
	}

	ptr		 = 0x600 * priv(dev)->tx_head;
	priv(dev)->tx_head = next_ptr;
	next_ptr	*= 0x600;

#define TXHDR_FLAGS (TXHDR_TRANSMIT|TXHDR_CHAINCONTINUE|TXHDR_DATAFOLLOWS|TXHDR_ENSUCCESS)

	ether3_setbuffer(dev, buffer_write, next_ptr);
	ether3_writelong(dev, 0);
	ether3_setbuffer(dev, buffer_write, ptr);
	ether3_writelong(dev, 0);
	ether3_writebuffer(dev, skb->data, length);
	ether3_writeword(dev, htons(next_ptr));
	ether3_writeword(dev, TXHDR_CHAINCONTINUE >> 16);
	ether3_setbuffer(dev, buffer_write, ptr);
	ether3_writeword(dev, htons((ptr + length + 4)));
	ether3_writeword(dev, TXHDR_FLAGS >> 16);
	ether3_ledon(dev);

	if (!(ether3_inw(REG_STATUS) & STAT_TXON)) {
		ether3_outw(ptr, REG_TRANSMITPTR);
		ether3_outw(priv(dev)->regs.command | CMD_TXON, REG_COMMAND);
	}

	next_ptr = (priv(dev)->tx_head + 1) & 15;
	local_irq_restore(flags);

	dev_kfree_skb(skb);

	if (priv(dev)->tx_tail == next_ptr)
		netif_stop_queue(dev);

 out:
	return NETDEV_TX_OK;
}

static irqreturn_t
ether3_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = (struct net_device *)dev_id;
	unsigned int status, handled = IRQ_NONE;

#if NET_DEBUG > 1
	if(net_debug & DEBUG_INT)
		printk("eth3irq: %d ", irq);
#endif

	status = ether3_inw(REG_STATUS);

	if (status & STAT_INTRX) {
		ether3_outw(CMD_ACKINTRX | priv(dev)->regs.command, REG_COMMAND);
		ether3_rx(dev, 12);
		handled = IRQ_HANDLED;
	}

	if (status & STAT_INTTX) {
		ether3_outw(CMD_ACKINTTX | priv(dev)->regs.command, REG_COMMAND);
		ether3_tx(dev);
		handled = IRQ_HANDLED;
	}

#if NET_DEBUG > 1
	if(net_debug & DEBUG_INT)
		printk("done\n");
#endif
	return handled;
}

/*
 * If we have a good packet(s), get it/them out of the buffers.
 */
static int ether3_rx(struct net_device *dev, unsigned int maxcnt)
{
	unsigned int next_ptr = priv(dev)->rx_head, received = 0;

	ether3_ledon(dev);

	do {
		unsigned int this_ptr, status;
		unsigned char addrs[16];

		/*
		 * read the first 16 bytes from the buffer.
		 * This contains the status bytes etc and ethernet addresses,
		 * and we also check the source ethernet address to see if
		 * it originated from us.
		 */
		{
			unsigned int temp_ptr;
			ether3_setbuffer(dev, buffer_read, next_ptr);
			temp_ptr = ether3_readword(dev);
			status = ether3_readword(dev);
			if ((status & (RXSTAT_DONE | RXHDR_CHAINCONTINUE | RXHDR_RECEIVE)) !=
				(RXSTAT_DONE | RXHDR_CHAINCONTINUE) || !temp_ptr)
				break;

			this_ptr = next_ptr + 4;
			next_ptr = ntohs(temp_ptr);
		}
		ether3_setbuffer(dev, buffer_read, this_ptr);
		ether3_readbuffer(dev, addrs+2, 12);

if (next_ptr < RX_START || next_ptr >= RX_END) {
 int i;
 printk("%s: bad next pointer @%04X: ", dev->name, priv(dev)->rx_head);
 printk("%02X %02X %02X %02X ", next_ptr >> 8, next_ptr & 255, status & 255, status >> 8);
 for (i = 2; i < 14; i++)
   printk("%02X ", addrs[i]);
 printk("\n");
 next_ptr = priv(dev)->rx_head;
 break;
}
		/*
 		 * ignore our own packets...
	 	 */
		if (!(*(unsigned long *)&dev->dev_addr[0] ^ *(unsigned long *)&addrs[2+6]) &&
		    !(*(unsigned short *)&dev->dev_addr[4] ^ *(unsigned short *)&addrs[2+10])) {
			maxcnt ++; /* compensate for loopedback packet */
			ether3_outw(next_ptr >> 8, REG_RECVEND);
		} else
		if (!(status & (RXSTAT_OVERSIZE|RXSTAT_CRCERROR|RXSTAT_DRIBBLEERROR|RXSTAT_SHORTPACKET))) {
			unsigned int length = next_ptr - this_ptr;
			struct sk_buff *skb;

			if (next_ptr <= this_ptr)
				length += RX_END - RX_START;

			skb = netdev_alloc_skb(dev, length + 2);
			if (skb) {
				unsigned char *buf;

				skb_reserve(skb, 2);
				buf = skb_put(skb, length);
				ether3_readbuffer(dev, buf + 12, length - 12);
				ether3_outw(next_ptr >> 8, REG_RECVEND);
				*(unsigned short *)(buf + 0)	= *(unsigned short *)(addrs + 2);
				*(unsigned long *)(buf + 2)	= *(unsigned long *)(addrs + 4);
				*(unsigned long *)(buf + 6)	= *(unsigned long *)(addrs + 8);
				*(unsigned short *)(buf + 10)	= *(unsigned short *)(addrs + 12);
				skb->protocol = eth_type_trans(skb, dev);
				netif_rx(skb);
				received ++;
			} else
				goto dropping;
		} else {
			struct net_device_stats *stats = &dev->stats;
			ether3_outw(next_ptr >> 8, REG_RECVEND);
			if (status & RXSTAT_OVERSIZE)	  stats->rx_over_errors ++;
			if (status & RXSTAT_CRCERROR)	  stats->rx_crc_errors ++;
			if (status & RXSTAT_DRIBBLEERROR) stats->rx_fifo_errors ++;
			if (status & RXSTAT_SHORTPACKET)  stats->rx_length_errors ++;
			stats->rx_errors++;
		}
	}
	while (-- maxcnt);

done:
	dev->stats.rx_packets += received;
	priv(dev)->rx_head = next_ptr;
	/*
	 * If rx went off line, then that means that the buffer may be full.  We
	 * have dropped at least one packet.
	 */
	if (!(ether3_inw(REG_STATUS) & STAT_RXON)) {
		dev->stats.rx_dropped++;
    		ether3_outw(next_ptr, REG_RECVPTR);
		ether3_outw(priv(dev)->regs.command | CMD_RXON, REG_COMMAND);
	}

	return maxcnt;

dropping:{
	static unsigned long last_warned;

	ether3_outw(next_ptr >> 8, REG_RECVEND);
	/*
	 * Don't print this message too many times...
	 */
	if (time_after(jiffies, last_warned + 10 * HZ)) {
		last_warned = jiffies;
		printk("%s: memory squeeze, dropping packet.\n", dev->name);
	}
	dev->stats.rx_dropped++;
	goto done;
	}
}

/*
 * Update stats for the transmitted packet(s)
 */
static void ether3_tx(struct net_device *dev)
{
	unsigned int tx_tail = priv(dev)->tx_tail;
	int max_work = 14;

	do {
	    	unsigned long status;

    		/*
	    	 * Read the packet header
    		 */
	    	ether3_setbuffer(dev, buffer_read, tx_tail * 0x600);
    		status = ether3_readlong(dev);

		/*
		 * Check to see if this packet has been transmitted
		 */
		if ((status & (TXSTAT_DONE | TXHDR_TRANSMIT)) !=
		    (TXSTAT_DONE | TXHDR_TRANSMIT))
			break;

		/*
		 * Update errors
		 */
		if (!(status & (TXSTAT_BABBLED | TXSTAT_16COLLISIONS)))
			dev->stats.tx_packets++;
		else {
			dev->stats.tx_errors++;
			if (status & TXSTAT_16COLLISIONS)
				dev->stats.collisions += 16;
			if (status & TXSTAT_BABBLED)
				dev->stats.tx_fifo_errors++;
		}

		tx_tail = (tx_tail + 1) & 15;
	} while (--max_work);

	if (priv(dev)->tx_tail != tx_tail) {
		priv(dev)->tx_tail = tx_tail;
		netif_wake_queue(dev);
	}
}

static void ether3_banner(void)
{
	static unsigned version_printed = 0;

	if (net_debug && version_printed++ == 0)
		printk(KERN_INFO "%s", version);
}

static const struct net_device_ops ether3_netdev_ops = {
	.ndo_open		= ether3_open,
	.ndo_stop		= ether3_close,
	.ndo_start_xmit		= ether3_sendpacket,
	.ndo_set_rx_mode	= ether3_setmulticastlist,
	.ndo_tx_timeout		= ether3_timeout,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_change_mtu		= eth_change_mtu,
	.ndo_set_mac_address	= eth_mac_addr,
};

static int
ether3_probe(struct expansion_card *ec, const struct ecard_id *id)
{
	const struct ether3_data *data = id->data;
	struct net_device *dev;
	int bus_type, ret;

	ether3_banner();

	ret = ecard_request_resources(ec);
	if (ret)
		goto out;

	dev = alloc_etherdev(sizeof(struct dev_priv));
	if (!dev) {
		ret = -ENOMEM;
		goto release;
	}

	SET_NETDEV_DEV(dev, &ec->dev);

	priv(dev)->base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
	if (!priv(dev)->base) {
		ret = -ENOMEM;
		goto free;
	}

	ec->irqaddr = priv(dev)->base + data->base_offset;
	ec->irqmask = 0xf0;

	priv(dev)->seeq = priv(dev)->base + data->base_offset;
	dev->irq = ec->irq;

	ether3_addr(dev->dev_addr, ec);

	init_timer(&priv(dev)->timer);

	/* Reset card...
	 */
	ether3_outb(0x80, REG_CONFIG2 + 4);
	bus_type = BUS_UNKNOWN;
	udelay(4);

	/* Test using Receive Pointer (16-bit register) to find out
	 * how the ether3 is connected to the bus...
	 */
	if (ether3_probe_bus_8(dev, 0x100) &&
	    ether3_probe_bus_8(dev, 0x201))
		bus_type = BUS_8;

	if (bus_type == BUS_UNKNOWN &&
	    ether3_probe_bus_16(dev, 0x101) &&
	    ether3_probe_bus_16(dev, 0x201))
		bus_type = BUS_16;

	switch (bus_type) {
	case BUS_UNKNOWN:
		printk(KERN_ERR "%s: unable to identify bus width\n", dev->name);
		ret = -ENODEV;
		goto free;

	case BUS_8:
		printk(KERN_ERR "%s: %s found, but is an unsupported "
			"8-bit card\n", dev->name, data->name);
		ret = -ENODEV;
		goto free;

	default:
		break;
	}

	if (ether3_init_2(dev)) {
		ret = -ENODEV;
		goto free;
	}

	dev->netdev_ops		= &ether3_netdev_ops;
	dev->watchdog_timeo	= 5 * HZ / 100;

	ret = register_netdev(dev);
	if (ret)
		goto free;

	printk("%s: %s in slot %d, %pM\n",
	       dev->name, data->name, ec->slot_no, dev->dev_addr);

	ecard_set_drvdata(ec, dev);
	return 0;

 free:
	free_netdev(dev);
 release:
	ecard_release_resources(ec);
 out:
	return ret;
}

static void ether3_remove(struct expansion_card *ec)
{
	struct net_device *dev = ecard_get_drvdata(ec);

	ecard_set_drvdata(ec, NULL);

	unregister_netdev(dev);
	free_netdev(dev);
	ecard_release_resources(ec);
}

static struct ether3_data ether3 = {
	.name		= "ether3",
	.base_offset	= 0,
};

static struct ether3_data etherb = {
	.name		= "etherb",
	.base_offset	= 0x800,
};

static const struct ecard_id ether3_ids[] = {
	{ MANU_ANT2, PROD_ANT_ETHER3, &ether3 },
	{ MANU_ANT,  PROD_ANT_ETHER3, &ether3 },
	{ MANU_ANT,  PROD_ANT_ETHERB, &etherb },
	{ 0xffff, 0xffff }
};

static struct ecard_driver ether3_driver = {
	.probe		= ether3_probe,
	.remove		= ether3_remove,
	.id_table	= ether3_ids,
	.drv = {
		.name	= "ether3",
	},
};

static int __init ether3_init(void)
{
	return ecard_register_driver(&ether3_driver);
}

static void __exit ether3_exit(void)
{
	ecard_remove_driver(&ether3_driver);
}

module_init(ether3_init);
module_exit(ether3_exit);

MODULE_LICENSE("GPL");