aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/at1700.c
blob: 93185f5f09accd10ec947b2b30179071703e4f8e (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
/* at1700.c: A network device driver for  the Allied Telesis AT1700.

	Written 1993-98 by Donald Becker.

	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.

	The author may be reached as becker@scyld.com, or C/O
	Scyld Computing Corporation
	410 Severn Ave., Suite 210
	Annapolis MD 21403

	This is a device driver for the Allied Telesis AT1700, and
        Fujitsu FMV-181/182/181A/182A/183/184/183A/184A, which are
	straight-forward Fujitsu MB86965 implementations.

	Modification for Fujitsu FMV-18X cards is done by Yutaka Tamiya
	(tamy@flab.fujitsu.co.jp).

  Sources:
    The Fujitsu MB86965 datasheet.

	After the initial version of this driver was written Gerry Sawkins of
	ATI provided their EEPROM configuration code header file.
    Thanks to NIIBE Yutaka <gniibe@mri.co.jp> for bug fixes.

    MCA bus (AT1720) support by Rene Schmit <rene@bss.lu>

  Bugs:
	The MB86965 has a design flaw that makes all probes unreliable.  Not
	only is it difficult to detect, it also moves around in I/O space in
	response to inb()s from other device probes!
*/

#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/mca-legacy.h>
#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/skbuff.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/crc32.h>
#include <linux/bitops.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/dma.h>

static char version[] __initdata =
	"at1700.c:v1.16 9/11/06  Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";

#define DRV_NAME "at1700"

/* Tunable parameters. */

/* When to switch from the 64-entry multicast filter to Rx-all-multicast. */
#define MC_FILTERBREAK 64

/* These unusual address orders are used to verify the CONFIG register. */

static int fmv18x_probe_list[] __initdata = {
	0x220, 0x240, 0x260, 0x280, 0x2a0, 0x2c0, 0x300, 0x340, 0
};

/*
 *	ISA
 */

static unsigned at1700_probe_list[] __initdata = {
	0x260, 0x280, 0x2a0, 0x240, 0x340, 0x320, 0x380, 0x300, 0
};

/*
 *	MCA
 */
#ifdef CONFIG_MCA_LEGACY
static int at1700_ioaddr_pattern[] __initdata = {
	0x00, 0x04, 0x01, 0x05, 0x02, 0x06, 0x03, 0x07
};

static int at1700_mca_probe_list[] __initdata = {
	0x400, 0x1400, 0x2400, 0x3400, 0x4400, 0x5400, 0x6400, 0x7400, 0
};

static int at1700_irq_pattern[] __initdata = {
	0x00, 0x00, 0x00, 0x30, 0x70, 0xb0, 0x00, 0x00,
	0x00, 0xf0, 0x34, 0x74, 0xb4, 0x00, 0x00, 0xf4, 0x00
};
#endif

/* use 0 for production, 1 for verification, >2 for debug */
#ifndef NET_DEBUG
#define NET_DEBUG 1
#endif
static unsigned int net_debug = NET_DEBUG;

typedef unsigned char uchar;

/* Information that need to be kept for each board. */
struct net_local {
	spinlock_t lock;
	unsigned char mc_filter[8];
	uint jumpered:1;			/* Set iff the board has jumper config. */
	uint tx_started:1;			/* Packets are on the Tx queue. */
	uint tx_queue_ready:1;			/* Tx queue is ready to be sent. */
	uint rx_started:1;			/* Packets are Rxing. */
	uchar tx_queue;				/* Number of packet on the Tx queue. */
	char mca_slot;				/* -1 means ISA */
	ushort tx_queue_len;			/* Current length of the Tx queue. */
};


/* Offsets from the base address. */
#define STATUS			0
#define TX_STATUS		0
#define RX_STATUS		1
#define TX_INTR			2		/* Bit-mapped interrupt enable registers. */
#define RX_INTR			3
#define TX_MODE			4
#define RX_MODE			5
#define CONFIG_0		6		/* Misc. configuration settings. */
#define CONFIG_1		7
/* Run-time register bank 2 definitions. */
#define DATAPORT		8		/* Word-wide DMA or programmed-I/O dataport. */
#define TX_START		10
#define COL16CNTL		11		/* Controll Reg for 16 collisions */
#define MODE13			13
#define RX_CTRL			14
/* Configuration registers only on the '865A/B chips. */
#define EEPROM_Ctrl 	16
#define EEPROM_Data 	17
#define CARDSTATUS	16			/* FMV-18x Card Status */
#define CARDSTATUS1	17			/* FMV-18x Card Status */
#define IOCONFIG		18		/* Either read the jumper, or move the I/O. */
#define IOCONFIG1		19
#define	SAPROM			20		/* The station address PROM, if no EEPROM. */
#define MODE24			24
#define RESET			31		/* Write to reset some parts of the chip. */
#define AT1700_IO_EXTENT	32
#define PORT_OFFSET(o) (o)


#define TX_TIMEOUT		10


/* Index to functions, as function prototypes. */

static int at1700_probe1(struct net_device *dev, int ioaddr);
static int read_eeprom(long ioaddr, int location);
static int net_open(struct net_device *dev);
static netdev_tx_t net_send_packet(struct sk_buff *skb,
				   struct net_device *dev);
static irqreturn_t net_interrupt(int irq, void *dev_id);
static void net_rx(struct net_device *dev);
static int net_close(struct net_device *dev);
static void set_rx_mode(struct net_device *dev);
static void net_tx_timeout (struct net_device *dev);


#ifdef CONFIG_MCA_LEGACY
struct at1720_mca_adapters_struct {
	char* name;
	int id;
};
/* rEnE : maybe there are others I don't know off... */

static struct at1720_mca_adapters_struct at1720_mca_adapters[] __initdata = {
	{ "Allied Telesys AT1720AT",	0x6410 },
	{ "Allied Telesys AT1720BT", 	0x6413 },
	{ "Allied Telesys AT1720T",	0x6416 },
	{ NULL, 0 },
};
#endif

/* 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 == 1, always return failure.
   If dev->base_addr == 2, allocate space for the device and return success
   (detachable devices only).
   */

static int io = 0x260;

static int irq;

static void cleanup_card(struct net_device *dev)
{
#ifdef CONFIG_MCA_LEGACY
	struct net_local *lp = netdev_priv(dev);
	if (lp->mca_slot >= 0)
		mca_mark_as_unused(lp->mca_slot);
#endif
	free_irq(dev->irq, NULL);
	release_region(dev->base_addr, AT1700_IO_EXTENT);
}

struct net_device * __init at1700_probe(int unit)
{
	struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
	unsigned *port;
	int err = 0;

	if (!dev)
		return ERR_PTR(-ENODEV);

	if (unit >= 0) {
		sprintf(dev->name, "eth%d", unit);
		netdev_boot_setup_check(dev);
		io = dev->base_addr;
		irq = dev->irq;
	} else {
		dev->base_addr = io;
		dev->irq = irq;
	}

	if (io > 0x1ff) {	/* Check a single specified location. */
		err = at1700_probe1(dev, io);
	} else if (io != 0) {	/* Don't probe at all. */
		err = -ENXIO;
	} else {
		for (port = at1700_probe_list; *port; port++) {
			if (at1700_probe1(dev, *port) == 0)
				break;
			dev->irq = irq;
		}
		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 at1700_netdev_ops = {
	.ndo_open		= net_open,
	.ndo_stop		= net_close,
	.ndo_start_xmit 	= net_send_packet,
	.ndo_set_multicast_list = set_rx_mode,
	.ndo_tx_timeout 	= net_tx_timeout,
	.ndo_change_mtu		= eth_change_mtu,
	.ndo_set_mac_address 	= eth_mac_addr,
	.ndo_validate_addr	= eth_validate_addr,
};

/* The Fujitsu datasheet suggests that the NIC be probed for by checking its
   "signature", the default bit pattern after a reset.  This *doesn't* work --
   there is no way to reset the bus interface without a complete power-cycle!

   It turns out that ATI came to the same conclusion I did: the only thing
   that can be done is checking a few bits and then diving right into an
   EEPROM read. */

static int __init at1700_probe1(struct net_device *dev, int ioaddr)
{
	char fmv_irqmap[4] = {3, 7, 10, 15};
	char fmv_irqmap_pnp[8] = {3, 4, 5, 7, 9, 10, 11, 15};
	char at1700_irqmap[8] = {3, 4, 5, 9, 10, 11, 14, 15};
	unsigned int i, irq, is_fmv18x = 0, is_at1700 = 0;
	int slot, ret = -ENODEV;
	struct net_local *lp = netdev_priv(dev);

	if (!request_region(ioaddr, AT1700_IO_EXTENT, DRV_NAME))
		return -EBUSY;

	/* Resetting the chip doesn't reset the ISA interface, so don't bother.
	   That means we have to be careful with the register values we probe
	   for.
	 */
#ifdef notdef
	printk("at1700 probe at %#x, eeprom is %4.4x %4.4x %4.4x ctrl %4.4x.\n",
		   ioaddr, read_eeprom(ioaddr, 4), read_eeprom(ioaddr, 5),
		   read_eeprom(ioaddr, 6), inw(ioaddr + EEPROM_Ctrl));
#endif

#ifdef CONFIG_MCA_LEGACY
	/* rEnE (rene@bss.lu): got this from 3c509 driver source , adapted for AT1720 */

    /* Based on Erik Nygren's (nygren@mit.edu) 3c529 patch, heavily
	modified by Chris Beauregard (cpbeaure@csclub.uwaterloo.ca)
	to support standard MCA probing. */

	/* redone for multi-card detection by ZP Gu (zpg@castle.net) */
	/* now works as a module */

	if (MCA_bus) {
		int j;
		int l_i;
		u_char pos3, pos4;

		for (j = 0; at1720_mca_adapters[j].name != NULL; j ++) {
			slot = 0;
			while (slot != MCA_NOTFOUND) {

				slot = mca_find_unused_adapter( at1720_mca_adapters[j].id, slot );
				if (slot == MCA_NOTFOUND) break;

				/* if we get this far, an adapter has been detected and is
				enabled */

				pos3 = mca_read_stored_pos( slot, 3 );
				pos4 = mca_read_stored_pos( slot, 4 );

				for (l_i = 0; l_i < 8; l_i++)
					if (( pos3 & 0x07) == at1700_ioaddr_pattern[l_i])
						break;
				ioaddr = at1700_mca_probe_list[l_i];

				for (irq = 0; irq < 0x10; irq++)
					if (((((pos4>>4) & 0x0f) | (pos3 & 0xf0)) & 0xff) == at1700_irq_pattern[irq])
						break;

					/* probing for a card at a particular IO/IRQ */
				if ((dev->irq && dev->irq != irq) ||
				    (dev->base_addr && dev->base_addr != ioaddr)) {
				  	slot++;		/* probing next slot */
				  	continue;
				}

				dev->irq = irq;

				/* claim the slot */
				mca_set_adapter_name( slot, at1720_mca_adapters[j].name );
				mca_mark_as_used(slot);

				goto found;
			}
		}
		/* if we get here, we didn't find an MCA adapter - try ISA */
	}
#endif
	slot = -1;
	/* We must check for the EEPROM-config boards first, else accessing
	   IOCONFIG0 will move the board! */
	if (at1700_probe_list[inb(ioaddr + IOCONFIG1) & 0x07] == ioaddr &&
	    read_eeprom(ioaddr, 4) == 0x0000 &&
	    (read_eeprom(ioaddr, 5) & 0xff00) == 0xF400)
		is_at1700 = 1;
	else if (inb(ioaddr + SAPROM    ) == 0x00 &&
		 inb(ioaddr + SAPROM + 1) == 0x00 &&
		 inb(ioaddr + SAPROM + 2) == 0x0e)
		is_fmv18x = 1;
	else {
		goto err_out;
	}

#ifdef CONFIG_MCA_LEGACY
found:
#endif

		/* Reset the internal state machines. */
	outb(0, ioaddr + RESET);

	if (is_at1700) {
		irq = at1700_irqmap[(read_eeprom(ioaddr, 12)&0x04)
						   | (read_eeprom(ioaddr, 0)>>14)];
	} else {
		/* Check PnP mode for FMV-183/184/183A/184A. */
		/* This PnP routine is very poor. IO and IRQ should be known. */
		if (inb(ioaddr + CARDSTATUS1) & 0x20) {
			irq = dev->irq;
			for (i = 0; i < 8; i++) {
				if (irq == fmv_irqmap_pnp[i])
					break;
			}
			if (i == 8) {
				goto err_mca;
			}
		} else {
			if (fmv18x_probe_list[inb(ioaddr + IOCONFIG) & 0x07] != ioaddr)
				goto err_mca;
			irq = fmv_irqmap[(inb(ioaddr + IOCONFIG)>>6) & 0x03];
		}
	}

	printk("%s: %s found at %#3x, IRQ %d, address ", dev->name,
		   is_at1700 ? "AT1700" : "FMV-18X", ioaddr, irq);

	dev->base_addr = ioaddr;
	dev->irq = irq;

	if (is_at1700) {
		for(i = 0; i < 3; i++) {
			unsigned short eeprom_val = read_eeprom(ioaddr, 4+i);
			((unsigned short *)dev->dev_addr)[i] = ntohs(eeprom_val);
		}
	} else {
		for(i = 0; i < 6; i++) {
			unsigned char val = inb(ioaddr + SAPROM + i);
			dev->dev_addr[i] = val;
		}
	}
	printk("%pM", dev->dev_addr);

	/* The EEPROM word 12 bit 0x0400 means use regular 100 ohm 10baseT signals,
	   rather than 150 ohm shielded twisted pair compensation.
	   0x0000 == auto-sense the interface
	   0x0800 == use TP interface
	   0x1800 == use coax interface
	   */
	{
		const char *porttype[] = {"auto-sense", "10baseT", "auto-sense", "10base2"};
		if (is_at1700) {
			ushort setup_value = read_eeprom(ioaddr, 12);
			dev->if_port = setup_value >> 8;
		} else {
			ushort setup_value = inb(ioaddr + CARDSTATUS);
			switch (setup_value & 0x07) {
			case 0x01: /* 10base5 */
			case 0x02: /* 10base2 */
				dev->if_port = 0x18; break;
			case 0x04: /* 10baseT */
				dev->if_port = 0x08; break;
			default:   /* auto-sense */
				dev->if_port = 0x00; break;
			}
		}
		printk(" %s interface.\n", porttype[(dev->if_port>>3) & 3]);
	}

	/* Set the configuration register 0 to 32K 100ns. byte-wide memory, 16 bit
	   bus access, two 4K Tx queues, and disabled Tx and Rx. */
	outb(0xda, ioaddr + CONFIG_0);

	/* Set the station address in bank zero. */
	outb(0x00, ioaddr + CONFIG_1);
	for (i = 0; i < 6; i++)
		outb(dev->dev_addr[i], ioaddr + PORT_OFFSET(8 + i));

	/* Switch to bank 1 and set the multicast table to accept none. */
	outb(0x04, ioaddr + CONFIG_1);
	for (i = 0; i < 8; i++)
		outb(0x00, ioaddr + PORT_OFFSET(8 + i));


	/* Switch to bank 2 */
	/* Lock our I/O address, and set manual processing mode for 16 collisions. */
	outb(0x08, ioaddr + CONFIG_1);
	outb(dev->if_port, ioaddr + MODE13);
	outb(0x00, ioaddr + COL16CNTL);

	if (net_debug)
		printk(version);

	dev->netdev_ops = &at1700_netdev_ops;
	dev->watchdog_timeo = TX_TIMEOUT;

	spin_lock_init(&lp->lock);

	lp->jumpered = is_fmv18x;
	lp->mca_slot = slot;
	/* Snarf the interrupt vector now. */
	ret = request_irq(irq, net_interrupt, 0, DRV_NAME, dev);
	if (ret) {
		printk(KERN_ERR "AT1700 at %#3x is unusable due to a "
		       "conflict on IRQ %d.\n",
		       ioaddr, irq);
		goto err_mca;
	}

	return 0;

err_mca:
#ifdef CONFIG_MCA_LEGACY
	if (slot >= 0)
		mca_mark_as_unused(slot);
#endif
err_out:
	release_region(ioaddr, AT1700_IO_EXTENT);
	return ret;
}


/*  EEPROM_Ctrl bits. */
#define EE_SHIFT_CLK	0x40	/* EEPROM shift clock, in reg. 16. */
#define EE_CS			0x20	/* EEPROM chip select, in reg. 16. */
#define EE_DATA_WRITE	0x80	/* EEPROM chip data in, in reg. 17. */
#define EE_DATA_READ	0x80	/* EEPROM chip data out, in reg. 17. */

/* The EEPROM commands include the alway-set leading bit. */
#define EE_WRITE_CMD	(5 << 6)
#define EE_READ_CMD		(6 << 6)
#define EE_ERASE_CMD	(7 << 6)

static int __init read_eeprom(long ioaddr, int location)
{
	int i;
	unsigned short retval = 0;
	long ee_addr = ioaddr + EEPROM_Ctrl;
	long ee_daddr = ioaddr + EEPROM_Data;
	int read_cmd = location | EE_READ_CMD;

	/* Shift the read command bits out. */
	for (i = 9; i >= 0; i--) {
		short dataval = (read_cmd & (1 << i)) ? EE_DATA_WRITE : 0;
		outb(EE_CS, ee_addr);
		outb(dataval, ee_daddr);
		outb(EE_CS | EE_SHIFT_CLK, ee_addr);	/* EEPROM clock tick. */
	}
	outb(EE_DATA_WRITE, ee_daddr);
	for (i = 16; i > 0; i--) {
		outb(EE_CS, ee_addr);
		outb(EE_CS | EE_SHIFT_CLK, ee_addr);
		retval = (retval << 1) | ((inb(ee_daddr) & EE_DATA_READ) ? 1 : 0);
	}

	/* Terminate the EEPROM access. */
	outb(EE_CS, ee_addr);
	outb(EE_SHIFT_CLK, ee_addr);
	outb(0, ee_addr);
	return retval;
}



static int net_open(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	int ioaddr = dev->base_addr;

	/* Set the configuration register 0 to 32K 100ns. byte-wide memory, 16 bit
	   bus access, and two 4K Tx queues. */
	outb(0x5a, ioaddr + CONFIG_0);

	/* Powerup, switch to register bank 2, and enable the Rx and Tx. */
	outb(0xe8, ioaddr + CONFIG_1);

	lp->tx_started = 0;
	lp->tx_queue_ready = 1;
	lp->rx_started = 0;
	lp->tx_queue = 0;
	lp->tx_queue_len = 0;

	/* Turn on hardware Tx and Rx interrupts. */
	outb(0x82, ioaddr + TX_INTR);
	outb(0x81, ioaddr + RX_INTR);

	/* Enable the IRQ on boards of fmv18x it is feasible. */
	if (lp->jumpered) {
		outb(0x80, ioaddr + IOCONFIG1);
	}

	netif_start_queue(dev);
	return 0;
}

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

	printk ("%s: transmit timed out with status %04x, %s?\n", dev->name,
		inw (ioaddr + STATUS), inb (ioaddr + TX_STATUS) & 0x80
		? "IRQ conflict" : "network cable problem");
	printk ("%s: timeout registers: %04x %04x %04x %04x %04x %04x %04x %04x.\n",
	 dev->name, inw(ioaddr + TX_STATUS), inw(ioaddr + TX_INTR), inw(ioaddr + TX_MODE),
		inw(ioaddr + CONFIG_0), inw(ioaddr + DATAPORT), inw(ioaddr + TX_START),
		inw(ioaddr + MODE13 - 1), inw(ioaddr + RX_CTRL));
	dev->stats.tx_errors++;
	/* ToDo: We should try to restart the adaptor... */
	outw(0xffff, ioaddr + MODE24);
	outw (0xffff, ioaddr + TX_STATUS);
	outb (0x5a, ioaddr + CONFIG_0);
	outb (0xe8, ioaddr + CONFIG_1);
	outw (0x8182, ioaddr + TX_INTR);
	outb (0x00, ioaddr + TX_START);
	outb (0x03, ioaddr + COL16CNTL);

	dev->trans_start = jiffies; /* prevent tx timeout */

	lp->tx_started = 0;
	lp->tx_queue_ready = 1;
	lp->rx_started = 0;
	lp->tx_queue = 0;
	lp->tx_queue_len = 0;

	netif_wake_queue(dev);
}


static netdev_tx_t net_send_packet (struct sk_buff *skb,
				    struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	int ioaddr = dev->base_addr;
	short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
	short len = skb->len;
	unsigned char *buf = skb->data;
	static u8 pad[ETH_ZLEN];

	netif_stop_queue (dev);

	/* We may not start transmitting unless we finish transferring
	   a packet into the Tx queue. During executing the following
	   codes we possibly catch a Tx interrupt. Thus we flag off
	   tx_queue_ready, so that we prevent the interrupt routine
	   (net_interrupt) to start transmitting. */
	lp->tx_queue_ready = 0;
	{
		outw (length, ioaddr + DATAPORT);
		/* Packet data */
		outsw (ioaddr + DATAPORT, buf, len >> 1);
		/* Check for dribble byte */
		if (len & 1) {
			outw(skb->data[skb->len-1], ioaddr + DATAPORT);
			len++;
		}
		/* Check for packet padding */
		if (length != skb->len)
			outsw(ioaddr + DATAPORT, pad, (length - len + 1) >> 1);

		lp->tx_queue++;
		lp->tx_queue_len += length + 2;
	}
	lp->tx_queue_ready = 1;

	if (lp->tx_started == 0) {
		/* If the Tx is idle, always trigger a transmit. */
		outb (0x80 | lp->tx_queue, ioaddr + TX_START);
		lp->tx_queue = 0;
		lp->tx_queue_len = 0;
		lp->tx_started = 1;
		netif_start_queue (dev);
	} else if (lp->tx_queue_len < 4096 - 1502)
		/* Yes, there is room for one more packet. */
		netif_start_queue (dev);
	dev_kfree_skb (skb);

	return NETDEV_TX_OK;
}

/* The typical workload of the driver:
   Handle the network interface interrupts. */
static irqreturn_t net_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct net_local *lp;
	int ioaddr, status;
	int handled = 0;

	if (dev == NULL) {
		printk ("at1700_interrupt(): irq %d for unknown device.\n", irq);
		return IRQ_NONE;
	}

	ioaddr = dev->base_addr;
	lp = netdev_priv(dev);

	spin_lock (&lp->lock);

	status = inw(ioaddr + TX_STATUS);
	outw(status, ioaddr + TX_STATUS);

	if (net_debug > 4)
		printk("%s: Interrupt with status %04x.\n", dev->name, status);
	if (lp->rx_started == 0 &&
	    (status & 0xff00 || (inb(ioaddr + RX_MODE) & 0x40) == 0)) {
		/* Got a packet(s).
		   We cannot execute net_rx more than once at the same time for
		   the same device. During executing net_rx, we possibly catch a
		   Tx interrupt. Thus we flag on rx_started, so that we prevent
		   the interrupt routine (net_interrupt) to dive into net_rx
		   again. */
		handled = 1;
		lp->rx_started = 1;
		outb(0x00, ioaddr + RX_INTR);	/* Disable RX intr. */
		net_rx(dev);
		outb(0x81, ioaddr + RX_INTR);	/* Enable  RX intr. */
		lp->rx_started = 0;
	}
	if (status & 0x00ff) {
		handled = 1;
		if (status & 0x02) {
			/* More than 16 collisions occurred */
			if (net_debug > 4)
				printk("%s: 16 Collision occur during Txing.\n", dev->name);
			/* Cancel sending a packet. */
			outb(0x03, ioaddr + COL16CNTL);
			dev->stats.collisions++;
		}
		if (status & 0x82) {
			dev->stats.tx_packets++;
			/* The Tx queue has any packets and is not being
			   transferred a packet from the host, start
			   transmitting. */
			if (lp->tx_queue && lp->tx_queue_ready) {
				outb(0x80 | lp->tx_queue, ioaddr + TX_START);
				lp->tx_queue = 0;
				lp->tx_queue_len = 0;
				dev->trans_start = jiffies;
				netif_wake_queue (dev);
			} else {
				lp->tx_started = 0;
				netif_wake_queue (dev);
			}
		}
	}

	spin_unlock (&lp->lock);
	return IRQ_RETVAL(handled);
}

/* We have a good packet(s), get it/them out of the buffers. */
static void
net_rx(struct net_device *dev)
{
	int ioaddr = dev->base_addr;
	int boguscount = 5;

	while ((inb(ioaddr + RX_MODE) & 0x40) == 0) {
		ushort status = inw(ioaddr + DATAPORT);
		ushort pkt_len = inw(ioaddr + DATAPORT);

		if (net_debug > 4)
			printk("%s: Rxing packet mode %02x status %04x.\n",
				   dev->name, inb(ioaddr + RX_MODE), status);
#ifndef final_version
		if (status == 0) {
			outb(0x05, ioaddr + RX_CTRL);
			break;
		}
#endif

		if ((status & 0xF0) != 0x20) {	/* There was an error. */
			dev->stats.rx_errors++;
			if (status & 0x08) dev->stats.rx_length_errors++;
			if (status & 0x04) dev->stats.rx_frame_errors++;
			if (status & 0x02) dev->stats.rx_crc_errors++;
			if (status & 0x01) dev->stats.rx_over_errors++;
		} else {
			/* Malloc up new buffer. */
			struct sk_buff *skb;

			if (pkt_len > 1550) {
				printk("%s: The AT1700 claimed a very large packet, size %d.\n",
					   dev->name, pkt_len);
				/* Prime the FIFO and then flush the packet. */
				inw(ioaddr + DATAPORT); inw(ioaddr + DATAPORT);
				outb(0x05, ioaddr + RX_CTRL);
				dev->stats.rx_errors++;
				break;
			}
			skb = dev_alloc_skb(pkt_len+3);
			if (skb == NULL) {
				printk("%s: Memory squeeze, dropping packet (len %d).\n",
					   dev->name, pkt_len);
				/* Prime the FIFO and then flush the packet. */
				inw(ioaddr + DATAPORT); inw(ioaddr + DATAPORT);
				outb(0x05, ioaddr + RX_CTRL);
				dev->stats.rx_dropped++;
				break;
			}
			skb_reserve(skb,2);

			insw(ioaddr + DATAPORT, skb_put(skb,pkt_len), (pkt_len + 1) >> 1);
			skb->protocol=eth_type_trans(skb, dev);
			netif_rx(skb);
			dev->stats.rx_packets++;
			dev->stats.rx_bytes += pkt_len;
		}
		if (--boguscount <= 0)
			break;
	}

	/* If any worth-while packets have been received, dev_rint()
	   has done a mark_bh(NET_BH) for us and will work on them
	   when we get to the bottom-half routine. */
	{
		int i;
		for (i = 0; i < 20; i++) {
			if ((inb(ioaddr + RX_MODE) & 0x40) == 0x40)
				break;
			inw(ioaddr + DATAPORT);				/* dummy status read */
			outb(0x05, ioaddr + RX_CTRL);
		}

		if (net_debug > 5)
			printk("%s: Exint Rx packet with mode %02x after %d ticks.\n",
				   dev->name, inb(ioaddr + RX_MODE), i);
	}
}

/* The inverse routine to net_open(). */
static int net_close(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	int ioaddr = dev->base_addr;

	netif_stop_queue(dev);

	/* Set configuration register 0 to disable Tx and Rx. */
	outb(0xda, ioaddr + CONFIG_0);

	/* No statistic counters on the chip to update. */

	/* Disable the IRQ on boards of fmv18x where it is feasible. */
	if (lp->jumpered) {
		outb(0x00, ioaddr + IOCONFIG1);
		free_irq(dev->irq, dev);
	}

	/* Power-down the chip.  Green, green, green! */
	outb(0x00, ioaddr + CONFIG_1);
	return 0;
}

/*
  Set the multicast/promiscuous mode for this adaptor.
*/

static void
set_rx_mode(struct net_device *dev)
{
	int ioaddr = dev->base_addr;
	struct net_local *lp = netdev_priv(dev);
	unsigned char mc_filter[8];		 /* Multicast hash filter */
	unsigned long flags;

	if (dev->flags & IFF_PROMISC) {
		memset(mc_filter, 0xff, sizeof(mc_filter));
		outb(3, ioaddr + RX_MODE);	/* Enable promiscuous mode */
	} else if (netdev_mc_count(dev) > MC_FILTERBREAK ||
			   (dev->flags & IFF_ALLMULTI)) {
		/* Too many to filter perfectly -- accept all multicasts. */
		memset(mc_filter, 0xff, sizeof(mc_filter));
		outb(2, ioaddr + RX_MODE);	/* Use normal mode. */
	} else if (netdev_mc_empty(dev)) {
		memset(mc_filter, 0x00, sizeof(mc_filter));
		outb(1, ioaddr + RX_MODE);	/* Ignore almost all multicasts. */
	} else {
		struct netdev_hw_addr *ha;

		memset(mc_filter, 0, sizeof(mc_filter));
		netdev_for_each_mc_addr(ha, dev) {
			unsigned int bit =
				ether_crc_le(ETH_ALEN, ha->addr) >> 26;
			mc_filter[bit >> 3] |= (1 << bit);
		}
		outb(0x02, ioaddr + RX_MODE);	/* Use normal mode. */
	}

	spin_lock_irqsave (&lp->lock, flags);
	if (memcmp(mc_filter, lp->mc_filter, sizeof(mc_filter))) {
		int i;
		int saved_bank = inw(ioaddr + CONFIG_0);
		/* Switch to bank 1 and set the multicast table. */
		outw((saved_bank & ~0x0C00) | 0x0480, ioaddr + CONFIG_0);
		for (i = 0; i < 8; i++)
			outb(mc_filter[i], ioaddr + PORT_OFFSET(8 + i));
		memcpy(lp->mc_filter, mc_filter, sizeof(mc_filter));
		outw(saved_bank, ioaddr + CONFIG_0);
	}
	spin_unlock_irqrestore (&lp->lock, flags);
}

#ifdef MODULE
static struct net_device *dev_at1700;

module_param(io, int, 0);
module_param(irq, int, 0);
module_param(net_debug, int, 0);
MODULE_PARM_DESC(io, "AT1700/FMV18X I/O base address");
MODULE_PARM_DESC(irq, "AT1700/FMV18X IRQ number");
MODULE_PARM_DESC(net_debug, "AT1700/FMV18X debug level (0-6)");

static int __init at1700_module_init(void)
{
	if (io == 0)
		printk("at1700: You should not use auto-probing with insmod!\n");
	dev_at1700 = at1700_probe(-1);
	if (IS_ERR(dev_at1700))
		return PTR_ERR(dev_at1700);
	return 0;
}

static void __exit at1700_module_exit(void)
{
	unregister_netdev(dev_at1700);
	cleanup_card(dev_at1700);
	free_netdev(dev_at1700);
}
module_init(at1700_module_init);
module_exit(at1700_module_exit);
#endif /* MODULE */
MODULE_LICENSE("GPL");