summaryrefslogtreecommitdiffstats
path: root/drivers/net/ethernet/3com/3c574_cs.c
blob: 66df936380859b55ab0b8b15595319bfeb98c98a (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
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
/* 3c574.c: A PCMCIA ethernet driver for the 3com 3c574 "RoadRunner".

	Written 1993-1998 by
	Donald Becker, becker@scyld.com, (driver core) and
	David Hinds, dahinds@users.sourceforge.net (from his PC card code).
	Locking fixes (C) Copyright 2003 Red Hat Inc

	This software may be used and distributed according to the terms of
	the GNU General Public License, incorporated herein by reference.

	This driver derives from Donald Becker's 3c509 core, which has the
	following copyright:
	Copyright 1993 United States Government as represented by the
	Director, National Security Agency.
	

*/

/*
				Theory of Operation

I. Board Compatibility

This device driver is designed for the 3Com 3c574 PC card Fast Ethernet
Adapter.

II. Board-specific settings

None -- PC cards are autoconfigured.

III. Driver operation

The 3c574 uses a Boomerang-style interface, without the bus-master capability.
See the Boomerang driver and documentation for most details.

IV. Notes and chip documentation.

Two added registers are used to enhance PIO performance, RunnerRdCtrl and
RunnerWrCtrl.  These are 11 bit down-counters that are preloaded with the
count of word (16 bits) reads or writes the driver is about to do to the Rx
or Tx FIFO.  The chip is then able to hide the internal-PCI-bus to PC-card
translation latency by buffering the I/O operations with an 8 word FIFO.
Note: No other chip accesses are permitted when this buffer is used.

A second enhancement is that both attribute and common memory space
0x0800-0x0fff can translated to the PIO FIFO.  Thus memory operations (faster
with *some* PCcard bridges) may be used instead of I/O operations.
This is enabled by setting the 0x10 bit in the PCMCIA LAN COR.

Some slow PC card bridges work better if they never see a WAIT signal.
This is configured by setting the 0x20 bit in the PCMCIA LAN COR.
Only do this after testing that it is reliable and improves performance.

The upper five bits of RunnerRdCtrl are used to window into PCcard
configuration space registers.  Window 0 is the regular Boomerang/Odie
register set, 1-5 are various PC card control registers, and 16-31 are
the (reversed!) CIS table.

A final note: writing the InternalConfig register in window 3 with an
invalid ramWidth is Very Bad.

V. References

http://www.scyld.com/expert/NWay.html
http://www.national.com/opf/DP/DP83840A.html

Thanks to Terry Murphy of 3Com for providing development information for
earlier 3Com products.

*/

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/in.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/ioport.h>
#include <linux/bitops.h>
#include <linux/mii.h>

#include <pcmcia/cistpl.h>
#include <pcmcia/cisreg.h>
#include <pcmcia/ciscode.h>
#include <pcmcia/ds.h>

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

/*====================================================================*/

/* Module parameters */

MODULE_AUTHOR("David Hinds <dahinds@users.sourceforge.net>");
MODULE_DESCRIPTION("3Com 3c574 series PCMCIA ethernet driver");
MODULE_LICENSE("GPL");

#define INT_MODULE_PARM(n, v) static int n = v; module_param(n, int, 0)

/* Maximum events (Rx packets, etc.) to handle at each interrupt. */
INT_MODULE_PARM(max_interrupt_work, 32);

/* Force full duplex modes? */
INT_MODULE_PARM(full_duplex, 0);

/* Autodetect link polarity reversal? */
INT_MODULE_PARM(auto_polarity, 1);


/*====================================================================*/

/* Time in jiffies before concluding the transmitter is hung. */
#define TX_TIMEOUT  ((800*HZ)/1000)

/* To minimize the size of the driver source and make the driver more
   readable not all constants are symbolically defined.
   You'll need the manual if you want to understand driver details anyway. */
/* Offsets from base I/O address. */
#define EL3_DATA	0x00
#define EL3_CMD		0x0e
#define EL3_STATUS	0x0e

#define EL3WINDOW(win_num) outw(SelectWindow + (win_num), ioaddr + EL3_CMD)

/* The top five bits written to EL3_CMD are a command, the lower
   11 bits are the parameter, if applicable. */
enum el3_cmds {
	TotalReset = 0<<11, SelectWindow = 1<<11, StartCoax = 2<<11,
	RxDisable = 3<<11, RxEnable = 4<<11, RxReset = 5<<11, RxDiscard = 8<<11,
	TxEnable = 9<<11, TxDisable = 10<<11, TxReset = 11<<11,
	FakeIntr = 12<<11, AckIntr = 13<<11, SetIntrEnb = 14<<11,
	SetStatusEnb = 15<<11, SetRxFilter = 16<<11, SetRxThreshold = 17<<11,
	SetTxThreshold = 18<<11, SetTxStart = 19<<11, StatsEnable = 21<<11,
	StatsDisable = 22<<11, StopCoax = 23<<11,
};

enum elxl_status {
	IntLatch = 0x0001, AdapterFailure = 0x0002, TxComplete = 0x0004,
	TxAvailable = 0x0008, RxComplete = 0x0010, RxEarly = 0x0020,
	IntReq = 0x0040, StatsFull = 0x0080, CmdBusy = 0x1000 };

/* The SetRxFilter command accepts the following classes: */
enum RxFilter {
	RxStation = 1, RxMulticast = 2, RxBroadcast = 4, RxProm = 8
};

enum Window0 {
	Wn0EepromCmd = 10, Wn0EepromData = 12, /* EEPROM command/address, data. */
	IntrStatus=0x0E,		/* Valid in all windows. */
};
/* These assumes the larger EEPROM. */
enum Win0_EEPROM_cmds {
	EEPROM_Read = 0x200, EEPROM_WRITE = 0x100, EEPROM_ERASE = 0x300,
	EEPROM_EWENB = 0x30,		/* Enable erasing/writing for 10 msec. */
	EEPROM_EWDIS = 0x00,		/* Disable EWENB before 10 msec timeout. */
};

/* Register window 1 offsets, the window used in normal operation.
   On the "Odie" this window is always mapped at offsets 0x10-0x1f.
   Except for TxFree, which is overlapped by RunnerWrCtrl. */
enum Window1 {
	TX_FIFO = 0x10,  RX_FIFO = 0x10,  RxErrors = 0x14,
	RxStatus = 0x18,  Timer=0x1A, TxStatus = 0x1B,
	TxFree = 0x0C, /* Remaining free bytes in Tx buffer. */
	RunnerRdCtrl = 0x16, RunnerWrCtrl = 0x1c,
};

enum Window3 {			/* Window 3: MAC/config bits. */
	Wn3_Config=0, Wn3_MAC_Ctrl=6, Wn3_Options=8,
};
enum wn3_config {
	Ram_size = 7,
	Ram_width = 8,
	Ram_speed = 0x30,
	Rom_size = 0xc0,
	Ram_split_shift = 16,
	Ram_split = 3 << Ram_split_shift,
	Xcvr_shift = 20,
	Xcvr = 7 << Xcvr_shift,
	Autoselect = 0x1000000,
};

enum Window4 {		/* Window 4: Xcvr/media bits. */
	Wn4_FIFODiag = 4, Wn4_NetDiag = 6, Wn4_PhysicalMgmt=8, Wn4_Media = 10,
};

#define MEDIA_TP	0x00C0	/* Enable link beat and jabber for 10baseT. */

struct el3_private {
	struct pcmcia_device	*p_dev;
	u16 advertising, partner;		/* NWay media advertisement */
	unsigned char phys;			/* MII device address */
	unsigned int autoselect:1, default_media:3;	/* Read from the EEPROM/Wn3_Config. */
	/* for transceiver monitoring */
	struct timer_list media;
	unsigned short media_status;
	unsigned short fast_poll;
	unsigned long last_irq;
	spinlock_t window_lock;			/* Guards the Window selection */
};

/* Set iff a MII transceiver on any interface requires mdio preamble.
   This only set with the original DP83840 on older 3c905 boards, so the extra
   code size of a per-interface flag is not worthwhile. */
static char mii_preamble_required = 0;

/* Index of functions. */

static int tc574_config(struct pcmcia_device *link);
static void tc574_release(struct pcmcia_device *link);

static void mdio_sync(unsigned int ioaddr, int bits);
static int mdio_read(unsigned int ioaddr, int phy_id, int location);
static void mdio_write(unsigned int ioaddr, int phy_id, int location,
		       int value);
static unsigned short read_eeprom(unsigned int ioaddr, int index);
static void tc574_wait_for_completion(struct net_device *dev, int cmd);

static void tc574_reset(struct net_device *dev);
static void media_check(unsigned long arg);
static int el3_open(struct net_device *dev);
static netdev_tx_t el3_start_xmit(struct sk_buff *skb,
					struct net_device *dev);
static irqreturn_t el3_interrupt(int irq, void *dev_id);
static void update_stats(struct net_device *dev);
static struct net_device_stats *el3_get_stats(struct net_device *dev);
static int el3_rx(struct net_device *dev, int worklimit);
static int el3_close(struct net_device *dev);
static void el3_tx_timeout(struct net_device *dev);
static int el3_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
static void set_rx_mode(struct net_device *dev);
static void set_multicast_list(struct net_device *dev);

static void tc574_detach(struct pcmcia_device *p_dev);

/*
	tc574_attach() creates an "instance" of the driver, allocating
	local data structures for one device.  The device is registered
	with Card Services.
*/
static const struct net_device_ops el3_netdev_ops = {
	.ndo_open 		= el3_open,
	.ndo_stop 		= el3_close,
	.ndo_start_xmit		= el3_start_xmit,
	.ndo_tx_timeout 	= el3_tx_timeout,
	.ndo_get_stats		= el3_get_stats,
	.ndo_do_ioctl		= el3_ioctl,
	.ndo_set_rx_mode	= set_multicast_list,
	.ndo_change_mtu		= eth_change_mtu,
	.ndo_set_mac_address 	= eth_mac_addr,
	.ndo_validate_addr	= eth_validate_addr,
};

static int tc574_probe(struct pcmcia_device *link)
{
	struct el3_private *lp;
	struct net_device *dev;

	dev_dbg(&link->dev, "3c574_attach()\n");

	/* Create the PC card device object. */
	dev = alloc_etherdev(sizeof(struct el3_private));
	if (!dev)
		return -ENOMEM;
	lp = netdev_priv(dev);
	link->priv = dev;
	lp->p_dev = link;

	spin_lock_init(&lp->window_lock);
	link->resource[0]->end = 32;
	link->resource[0]->flags |= IO_DATA_PATH_WIDTH_16;
	link->config_flags |= CONF_ENABLE_IRQ;
	link->config_index = 1;

	dev->netdev_ops = &el3_netdev_ops;
	dev->watchdog_timeo = TX_TIMEOUT;

	return tc574_config(link);
}

static void tc574_detach(struct pcmcia_device *link)
{
	struct net_device *dev = link->priv;

	dev_dbg(&link->dev, "3c574_detach()\n");

	unregister_netdev(dev);

	tc574_release(link);

	free_netdev(dev);
} /* tc574_detach */

static const char *ram_split[] = {"5:3", "3:1", "1:1", "3:5"};

static int tc574_config(struct pcmcia_device *link)
{
	struct net_device *dev = link->priv;
	struct el3_private *lp = netdev_priv(dev);
	int ret, i, j;
	unsigned int ioaddr;
	__be16 *phys_addr;
	char *cardname;
	__u32 config;
	u8 *buf;
	size_t len;

	phys_addr = (__be16 *)dev->dev_addr;

	dev_dbg(&link->dev, "3c574_config()\n");

	link->io_lines = 16;

	for (i = j = 0; j < 0x400; j += 0x20) {
		link->resource[0]->start = j ^ 0x300;
		i = pcmcia_request_io(link);
		if (i == 0)
			break;
	}
	if (i != 0)
		goto failed;

	ret = pcmcia_request_irq(link, el3_interrupt);
	if (ret)
		goto failed;

	ret = pcmcia_enable_device(link);
	if (ret)
		goto failed;

	dev->irq = link->irq;
	dev->base_addr = link->resource[0]->start;

	ioaddr = dev->base_addr;

	/* The 3c574 normally uses an EEPROM for configuration info, including
	   the hardware address.  The future products may include a modem chip
	   and put the address in the CIS. */

	len = pcmcia_get_tuple(link, 0x88, &buf);
	if (buf && len >= 6) {
		for (i = 0; i < 3; i++)
			phys_addr[i] = htons(le16_to_cpu(buf[i * 2]));
		kfree(buf);
	} else {
		kfree(buf); /* 0 < len < 6 */
		EL3WINDOW(0);
		for (i = 0; i < 3; i++)
			phys_addr[i] = htons(read_eeprom(ioaddr, i + 10));
		if (phys_addr[0] == htons(0x6060)) {
			pr_notice("IO port conflict at 0x%03lx-0x%03lx\n",
				  dev->base_addr, dev->base_addr+15);
			goto failed;
		}
	}
	if (link->prod_id[1])
		cardname = link->prod_id[1];
	else
		cardname = "3Com 3c574";

	{
		u_char mcr;
		outw(2<<11, ioaddr + RunnerRdCtrl);
		mcr = inb(ioaddr + 2);
		outw(0<<11, ioaddr + RunnerRdCtrl);
		pr_info("  ASIC rev %d,", mcr>>3);
		EL3WINDOW(3);
		config = inl(ioaddr + Wn3_Config);
		lp->default_media = (config & Xcvr) >> Xcvr_shift;
		lp->autoselect = config & Autoselect ? 1 : 0;
	}

	init_timer(&lp->media);

	{
		int phy;
		
		/* Roadrunner only: Turn on the MII transceiver */
		outw(0x8040, ioaddr + Wn3_Options);
		mdelay(1);
		outw(0xc040, ioaddr + Wn3_Options);
		tc574_wait_for_completion(dev, TxReset);
		tc574_wait_for_completion(dev, RxReset);
		mdelay(1);
		outw(0x8040, ioaddr + Wn3_Options);
		
		EL3WINDOW(4);
		for (phy = 1; phy <= 32; phy++) {
			int mii_status;
			mdio_sync(ioaddr, 32);
			mii_status = mdio_read(ioaddr, phy & 0x1f, 1);
			if (mii_status != 0xffff) {
				lp->phys = phy & 0x1f;
				dev_dbg(&link->dev, "  MII transceiver at "
					"index %d, status %x.\n",
					  phy, mii_status);
				if ((mii_status & 0x0040) == 0)
					mii_preamble_required = 1;
				break;
			}
		}
		if (phy > 32) {
			pr_notice("  No MII transceivers found!\n");
			goto failed;
		}
		i = mdio_read(ioaddr, lp->phys, 16) | 0x40;
		mdio_write(ioaddr, lp->phys, 16, i);
		lp->advertising = mdio_read(ioaddr, lp->phys, 4);
		if (full_duplex) {
			/* Only advertise the FD media types. */
			lp->advertising &= ~0x02a0;
			mdio_write(ioaddr, lp->phys, 4, lp->advertising);
		}
	}

	SET_NETDEV_DEV(dev, &link->dev);

	if (register_netdev(dev) != 0) {
		pr_notice("register_netdev() failed\n");
		goto failed;
	}

	netdev_info(dev, "%s at io %#3lx, irq %d, hw_addr %pM\n",
		    cardname, dev->base_addr, dev->irq, dev->dev_addr);
	netdev_info(dev, " %dK FIFO split %s Rx:Tx, %sMII interface.\n",
		    8 << config & Ram_size,
		    ram_split[(config & Ram_split) >> Ram_split_shift],
		    config & Autoselect ? "autoselect " : "");

	return 0;

failed:
	tc574_release(link);
	return -ENODEV;

} /* tc574_config */

static void tc574_release(struct pcmcia_device *link)
{
	pcmcia_disable_device(link);
}

static int tc574_suspend(struct pcmcia_device *link)
{
	struct net_device *dev = link->priv;

	if (link->open)
		netif_device_detach(dev);

	return 0;
}

static int tc574_resume(struct pcmcia_device *link)
{
	struct net_device *dev = link->priv;

	if (link->open) {
		tc574_reset(dev);
		netif_device_attach(dev);
	}

	return 0;
}

static void dump_status(struct net_device *dev)
{
	unsigned int ioaddr = dev->base_addr;
	EL3WINDOW(1);
	netdev_info(dev, "  irq status %04x, rx status %04x, tx status %02x, tx free %04x\n",
		    inw(ioaddr+EL3_STATUS),
		    inw(ioaddr+RxStatus), inb(ioaddr+TxStatus),
		    inw(ioaddr+TxFree));
	EL3WINDOW(4);
	netdev_info(dev, "  diagnostics: fifo %04x net %04x ethernet %04x media %04x\n",
		    inw(ioaddr+0x04), inw(ioaddr+0x06),
		    inw(ioaddr+0x08), inw(ioaddr+0x0a));
	EL3WINDOW(1);
}

/*
  Use this for commands that may take time to finish
*/
static void tc574_wait_for_completion(struct net_device *dev, int cmd)
{
	int i = 1500;
	outw(cmd, dev->base_addr + EL3_CMD);
	while (--i > 0)
		if (!(inw(dev->base_addr + EL3_STATUS) & 0x1000)) break;
	if (i == 0)
		netdev_notice(dev, "command 0x%04x did not complete!\n", cmd);
}

/* Read a word from the EEPROM using the regular EEPROM access register.
   Assume that we are in register window zero.
 */
static unsigned short read_eeprom(unsigned int ioaddr, int index)
{
	int timer;
	outw(EEPROM_Read + index, ioaddr + Wn0EepromCmd);
	/* Pause for at least 162 usec for the read to take place. */
	for (timer = 1620; timer >= 0; timer--) {
		if ((inw(ioaddr + Wn0EepromCmd) & 0x8000) == 0)
			break;
	}
	return inw(ioaddr + Wn0EepromData);
}

/* MII transceiver control section.
   Read and write the MII registers using software-generated serial
   MDIO protocol.  See the MII specifications or DP83840A data sheet
   for details.
   The maxium data clock rate is 2.5 Mhz.  The timing is easily met by the
   slow PC card interface. */

#define MDIO_SHIFT_CLK	0x01
#define MDIO_DIR_WRITE	0x04
#define MDIO_DATA_WRITE0 (0x00 | MDIO_DIR_WRITE)
#define MDIO_DATA_WRITE1 (0x02 | MDIO_DIR_WRITE)
#define MDIO_DATA_READ	0x02
#define MDIO_ENB_IN		0x00

/* Generate the preamble required for initial synchronization and
   a few older transceivers. */
static void mdio_sync(unsigned int ioaddr, int bits)
{
	unsigned int mdio_addr = ioaddr + Wn4_PhysicalMgmt;

	/* Establish sync by sending at least 32 logic ones. */
	while (-- bits >= 0) {
		outw(MDIO_DATA_WRITE1, mdio_addr);
		outw(MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK, mdio_addr);
	}
}

static int mdio_read(unsigned int ioaddr, int phy_id, int location)
{
	int i;
	int read_cmd = (0xf6 << 10) | (phy_id << 5) | location;
	unsigned int retval = 0;
	unsigned int mdio_addr = ioaddr + Wn4_PhysicalMgmt;

	if (mii_preamble_required)
		mdio_sync(ioaddr, 32);

	/* Shift the read command bits out. */
	for (i = 14; i >= 0; i--) {
		int dataval = (read_cmd&(1<<i)) ? MDIO_DATA_WRITE1 : MDIO_DATA_WRITE0;
		outw(dataval, mdio_addr);
		outw(dataval | MDIO_SHIFT_CLK, mdio_addr);
	}
	/* Read the two transition, 16 data, and wire-idle bits. */
	for (i = 19; i > 0; i--) {
		outw(MDIO_ENB_IN, mdio_addr);
		retval = (retval << 1) | ((inw(mdio_addr) & MDIO_DATA_READ) ? 1 : 0);
		outw(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
	}
	return (retval>>1) & 0xffff;
}

static void mdio_write(unsigned int ioaddr, int phy_id, int location, int value)
{
	int write_cmd = 0x50020000 | (phy_id << 23) | (location << 18) | value;
	unsigned int mdio_addr = ioaddr + Wn4_PhysicalMgmt;
	int i;

	if (mii_preamble_required)
		mdio_sync(ioaddr, 32);

	/* Shift the command bits out. */
	for (i = 31; i >= 0; i--) {
		int dataval = (write_cmd&(1<<i)) ? MDIO_DATA_WRITE1 : MDIO_DATA_WRITE0;
		outw(dataval, mdio_addr);
		outw(dataval | MDIO_SHIFT_CLK, mdio_addr);
	}
	/* Leave the interface idle. */
	for (i = 1; i >= 0; i--) {
		outw(MDIO_ENB_IN, mdio_addr);
		outw(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
	}
}

/* Reset and restore all of the 3c574 registers. */
static void tc574_reset(struct net_device *dev)
{
	struct el3_private *lp = netdev_priv(dev);
	int i;
	unsigned int ioaddr = dev->base_addr;
	unsigned long flags;

	tc574_wait_for_completion(dev, TotalReset|0x10);

	spin_lock_irqsave(&lp->window_lock, flags);
	/* Clear any transactions in progress. */
	outw(0, ioaddr + RunnerWrCtrl);
	outw(0, ioaddr + RunnerRdCtrl);

	/* Set the station address and mask. */
	EL3WINDOW(2);
	for (i = 0; i < 6; i++)
		outb(dev->dev_addr[i], ioaddr + i);
	for (; i < 12; i+=2)
		outw(0, ioaddr + i);

	/* Reset config options */
	EL3WINDOW(3);
	outb((dev->mtu > 1500 ? 0x40 : 0), ioaddr + Wn3_MAC_Ctrl);
	outl((lp->autoselect ? 0x01000000 : 0) | 0x0062001b,
		 ioaddr + Wn3_Config);
	/* Roadrunner only: Turn on the MII transceiver. */
	outw(0x8040, ioaddr + Wn3_Options);
	mdelay(1);
	outw(0xc040, ioaddr + Wn3_Options);
	EL3WINDOW(1);
	spin_unlock_irqrestore(&lp->window_lock, flags);
	
	tc574_wait_for_completion(dev, TxReset);
	tc574_wait_for_completion(dev, RxReset);
	mdelay(1);
	spin_lock_irqsave(&lp->window_lock, flags);
	EL3WINDOW(3);
	outw(0x8040, ioaddr + Wn3_Options);

	/* Switch to the stats window, and clear all stats by reading. */
	outw(StatsDisable, ioaddr + EL3_CMD);
	EL3WINDOW(6);
	for (i = 0; i < 10; i++)
		inb(ioaddr + i);
	inw(ioaddr + 10);
	inw(ioaddr + 12);
	EL3WINDOW(4);
	inb(ioaddr + 12);
	inb(ioaddr + 13);

	/* .. enable any extra statistics bits.. */
	outw(0x0040, ioaddr + Wn4_NetDiag);
	
	EL3WINDOW(1);
	spin_unlock_irqrestore(&lp->window_lock, flags);
	
	/* .. re-sync MII and re-fill what NWay is advertising. */
	mdio_sync(ioaddr, 32);
	mdio_write(ioaddr, lp->phys, 4, lp->advertising);
	if (!auto_polarity) {
		/* works for TDK 78Q2120 series MII's */
		i = mdio_read(ioaddr, lp->phys, 16) | 0x20;
		mdio_write(ioaddr, lp->phys, 16, i);
	}

	spin_lock_irqsave(&lp->window_lock, flags);
	/* Switch to register set 1 for normal use, just for TxFree. */
	set_rx_mode(dev);
	spin_unlock_irqrestore(&lp->window_lock, flags);
	outw(StatsEnable, ioaddr + EL3_CMD); /* Turn on statistics. */
	outw(RxEnable, ioaddr + EL3_CMD); /* Enable the receiver. */
	outw(TxEnable, ioaddr + EL3_CMD); /* Enable transmitter. */
	/* Allow status bits to be seen. */
	outw(SetStatusEnb | 0xff, ioaddr + EL3_CMD);
	/* Ack all pending events, and set active indicator mask. */
	outw(AckIntr | IntLatch | TxAvailable | RxEarly | IntReq,
		 ioaddr + EL3_CMD);
	outw(SetIntrEnb | IntLatch | TxAvailable | RxComplete | StatsFull
		 | AdapterFailure | RxEarly, ioaddr + EL3_CMD);
}

static int el3_open(struct net_device *dev)
{
	struct el3_private *lp = netdev_priv(dev);
	struct pcmcia_device *link = lp->p_dev;

	if (!pcmcia_dev_present(link))
		return -ENODEV;
	
	link->open++;
	netif_start_queue(dev);
	
	tc574_reset(dev);
	lp->media.function = media_check;
	lp->media.data = (unsigned long) dev;
	lp->media.expires = jiffies + HZ;
	add_timer(&lp->media);
	
	dev_dbg(&link->dev, "%s: opened, status %4.4x.\n",
		  dev->name, inw(dev->base_addr + EL3_STATUS));
	
	return 0;
}

static void el3_tx_timeout(struct net_device *dev)
{
	unsigned int ioaddr = dev->base_addr;
	
	netdev_notice(dev, "Transmit timed out!\n");
	dump_status(dev);
	dev->stats.tx_errors++;
	dev->trans_start = jiffies; /* prevent tx timeout */
	/* Issue TX_RESET and TX_START commands. */
	tc574_wait_for_completion(dev, TxReset);
	outw(TxEnable, ioaddr + EL3_CMD);
	netif_wake_queue(dev);
}

static void pop_tx_status(struct net_device *dev)
{
	unsigned int ioaddr = dev->base_addr;
	int i;
    
	/* Clear the Tx status stack. */
	for (i = 32; i > 0; i--) {
		u_char tx_status = inb(ioaddr + TxStatus);
		if (!(tx_status & 0x84))
			break;
		/* reset transmitter on jabber error or underrun */
		if (tx_status & 0x30)
			tc574_wait_for_completion(dev, TxReset);
		if (tx_status & 0x38) {
			pr_debug("%s: transmit error: status 0x%02x\n",
				  dev->name, tx_status);
			outw(TxEnable, ioaddr + EL3_CMD);
			dev->stats.tx_aborted_errors++;
		}
		outb(0x00, ioaddr + TxStatus); /* Pop the status stack. */
	}
}

static netdev_tx_t el3_start_xmit(struct sk_buff *skb,
					struct net_device *dev)
{
	unsigned int ioaddr = dev->base_addr;
	struct el3_private *lp = netdev_priv(dev);
	unsigned long flags;

	pr_debug("%s: el3_start_xmit(length = %ld) called, "
		  "status %4.4x.\n", dev->name, (long)skb->len,
		  inw(ioaddr + EL3_STATUS));

	spin_lock_irqsave(&lp->window_lock, flags);

	dev->stats.tx_bytes += skb->len;

	/* Put out the doubleword header... */
	outw(skb->len, ioaddr + TX_FIFO);
	outw(0, ioaddr + TX_FIFO);
	/* ... and the packet rounded to a doubleword. */
	outsl(ioaddr + TX_FIFO, skb->data, (skb->len+3)>>2);

	/* TxFree appears only in Window 1, not offset 0x1c. */
	if (inw(ioaddr + TxFree) <= 1536) {
		netif_stop_queue(dev);
		/* Interrupt us when the FIFO has room for max-sized packet. 
		   The threshold is in units of dwords. */
		outw(SetTxThreshold + (1536>>2), ioaddr + EL3_CMD);
	}

	pop_tx_status(dev);
	spin_unlock_irqrestore(&lp->window_lock, flags);
	dev_kfree_skb(skb);
	return NETDEV_TX_OK;
}

/* The EL3 interrupt handler. */
static irqreturn_t el3_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = (struct net_device *) dev_id;
	struct el3_private *lp = netdev_priv(dev);
	unsigned int ioaddr;
	unsigned status;
	int work_budget = max_interrupt_work;
	int handled = 0;

	if (!netif_device_present(dev))
		return IRQ_NONE;
	ioaddr = dev->base_addr;

	pr_debug("%s: interrupt, status %4.4x.\n",
		  dev->name, inw(ioaddr + EL3_STATUS));

	spin_lock(&lp->window_lock);
	
	while ((status = inw(ioaddr + EL3_STATUS)) &
		   (IntLatch | RxComplete | RxEarly | StatsFull)) {
		if (!netif_device_present(dev) ||
			((status & 0xe000) != 0x2000)) {
			pr_debug("%s: Interrupt from dead card\n", dev->name);
			break;
		}

		handled = 1;

		if (status & RxComplete)
			work_budget = el3_rx(dev, work_budget);

		if (status & TxAvailable) {
			pr_debug("  TX room bit was handled.\n");
			/* There's room in the FIFO for a full-sized packet. */
			outw(AckIntr | TxAvailable, ioaddr + EL3_CMD);
			netif_wake_queue(dev);
		}

		if (status & TxComplete)
			pop_tx_status(dev);

		if (status & (AdapterFailure | RxEarly | StatsFull)) {
			/* Handle all uncommon interrupts. */
			if (status & StatsFull)
				update_stats(dev);
			if (status & RxEarly) {
				work_budget = el3_rx(dev, work_budget);
				outw(AckIntr | RxEarly, ioaddr + EL3_CMD);
			}
			if (status & AdapterFailure) {
				u16 fifo_diag;
				EL3WINDOW(4);
				fifo_diag = inw(ioaddr + Wn4_FIFODiag);
				EL3WINDOW(1);
				netdev_notice(dev, "adapter failure, FIFO diagnostic register %04x\n",
					      fifo_diag);
				if (fifo_diag & 0x0400) {
					/* Tx overrun */
					tc574_wait_for_completion(dev, TxReset);
					outw(TxEnable, ioaddr + EL3_CMD);
				}
				if (fifo_diag & 0x2000) {
					/* Rx underrun */
					tc574_wait_for_completion(dev, RxReset);
					set_rx_mode(dev);
					outw(RxEnable, ioaddr + EL3_CMD);
				}
				outw(AckIntr | AdapterFailure, ioaddr + EL3_CMD);
			}
		}

		if (--work_budget < 0) {
			pr_debug("%s: Too much work in interrupt, "
				  "status %4.4x.\n", dev->name, status);
			/* Clear all interrupts */
			outw(AckIntr | 0xFF, ioaddr + EL3_CMD);
			break;
		}
		/* Acknowledge the IRQ. */
		outw(AckIntr | IntReq | IntLatch, ioaddr + EL3_CMD);
	}

	pr_debug("%s: exiting interrupt, status %4.4x.\n",
		  dev->name, inw(ioaddr + EL3_STATUS));
		  
	spin_unlock(&lp->window_lock);
	return IRQ_RETVAL(handled);
}

/*
    This timer serves two purposes: to check for missed interrupts
	(and as a last resort, poll the NIC for events), and to monitor
	the MII, reporting changes in cable status.
*/
static void media_check(unsigned long arg)
{
	struct net_device *dev = (struct net_device *) arg;
	struct el3_private *lp = netdev_priv(dev);
	unsigned int ioaddr = dev->base_addr;
	unsigned long flags;
	unsigned short /* cable, */ media, partner;

	if (!netif_device_present(dev))
		goto reschedule;
	
	/* Check for pending interrupt with expired latency timer: with
	   this, we can limp along even if the interrupt is blocked */
	if ((inw(ioaddr + EL3_STATUS) & IntLatch) && (inb(ioaddr + Timer) == 0xff)) {
		if (!lp->fast_poll)
			netdev_info(dev, "interrupt(s) dropped!\n");

		local_irq_save(flags);
		el3_interrupt(dev->irq, dev);
		local_irq_restore(flags);

		lp->fast_poll = HZ;
	}
	if (lp->fast_poll) {
		lp->fast_poll--;
		lp->media.expires = jiffies + 2*HZ/100;
		add_timer(&lp->media);
		return;
	}

	spin_lock_irqsave(&lp->window_lock, flags);
	EL3WINDOW(4);
	media = mdio_read(ioaddr, lp->phys, 1);
	partner = mdio_read(ioaddr, lp->phys, 5);
	EL3WINDOW(1);
	
	if (media != lp->media_status) {
		if ((media ^ lp->media_status) & 0x0004)
			netdev_info(dev, "%s link beat\n",
				    (lp->media_status & 0x0004) ? "lost" : "found");
		if ((media ^ lp->media_status) & 0x0020) {
			lp->partner = 0;
			if (lp->media_status & 0x0020) {
				netdev_info(dev, "autonegotiation restarted\n");
			} else if (partner) {
				partner &= lp->advertising;
				lp->partner = partner;
				netdev_info(dev, "autonegotiation complete: "
					    "%dbaseT-%cD selected\n",
					    (partner & 0x0180) ? 100 : 10,
					    (partner & 0x0140) ? 'F' : 'H');
			} else {
				netdev_info(dev, "link partner did not autonegotiate\n");
			}

			EL3WINDOW(3);
			outb((partner & 0x0140 ? 0x20 : 0) |
				 (dev->mtu > 1500 ? 0x40 : 0), ioaddr + Wn3_MAC_Ctrl);
			EL3WINDOW(1);

		}
		if (media & 0x0010)
			netdev_info(dev, "remote fault detected\n");
		if (media & 0x0002)
			netdev_info(dev, "jabber detected\n");
		lp->media_status = media;
	}
	spin_unlock_irqrestore(&lp->window_lock, flags);

reschedule:
	lp->media.expires = jiffies + HZ;
	add_timer(&lp->media);
}

static struct net_device_stats *el3_get_stats(struct net_device *dev)
{
	struct el3_private *lp = netdev_priv(dev);

	if (netif_device_present(dev)) {
		unsigned long flags;
		spin_lock_irqsave(&lp->window_lock, flags);
		update_stats(dev);
		spin_unlock_irqrestore(&lp->window_lock, flags);
	}
	return &dev->stats;
}

/*  Update statistics.
	Surprisingly this need not be run single-threaded, but it effectively is.
	The counters clear when read, so the adds must merely be atomic.
 */
static void update_stats(struct net_device *dev)
{
	unsigned int ioaddr = dev->base_addr;
	u8 rx, tx, up;

	pr_debug("%s: updating the statistics.\n", dev->name);

	if (inw(ioaddr+EL3_STATUS) == 0xffff) /* No card. */
		return;
		
	/* Unlike the 3c509 we need not turn off stats updates while reading. */
	/* Switch to the stats window, and read everything. */
	EL3WINDOW(6);
	dev->stats.tx_carrier_errors 		+= inb(ioaddr + 0);
	dev->stats.tx_heartbeat_errors		+= inb(ioaddr + 1);
	/* Multiple collisions. */	   	inb(ioaddr + 2);
	dev->stats.collisions			+= inb(ioaddr + 3);
	dev->stats.tx_window_errors		+= inb(ioaddr + 4);
	dev->stats.rx_fifo_errors		+= inb(ioaddr + 5);
	dev->stats.tx_packets			+= inb(ioaddr + 6);
	up		 			 = inb(ioaddr + 9);
	dev->stats.tx_packets			+= (up&0x30) << 4;
	/* Rx packets   */			   inb(ioaddr + 7);
	/* Tx deferrals */			   inb(ioaddr + 8);
	rx		 			 = inw(ioaddr + 10);
	tx					 = inw(ioaddr + 12);

	EL3WINDOW(4);
	/* BadSSD */				   inb(ioaddr + 12);
	up					 = inb(ioaddr + 13);

	EL3WINDOW(1);
}

static int el3_rx(struct net_device *dev, int worklimit)
{
	unsigned int ioaddr = dev->base_addr;
	short rx_status;
	
	pr_debug("%s: in rx_packet(), status %4.4x, rx_status %4.4x.\n",
		  dev->name, inw(ioaddr+EL3_STATUS), inw(ioaddr+RxStatus));
	while (!((rx_status = inw(ioaddr + RxStatus)) & 0x8000) &&
			worklimit > 0) {
		worklimit--;
		if (rx_status & 0x4000) { /* Error, update stats. */
			short error = rx_status & 0x3800;
			dev->stats.rx_errors++;
			switch (error) {
			case 0x0000:	dev->stats.rx_over_errors++; break;
			case 0x0800:	dev->stats.rx_length_errors++; break;
			case 0x1000:	dev->stats.rx_frame_errors++; break;
			case 0x1800:	dev->stats.rx_length_errors++; break;
			case 0x2000:	dev->stats.rx_frame_errors++; break;
			case 0x2800:	dev->stats.rx_crc_errors++; break;
			}
		} else {
			short pkt_len = rx_status & 0x7ff;
			struct sk_buff *skb;

			skb = netdev_alloc_skb(dev, pkt_len + 5);

			pr_debug("  Receiving packet size %d status %4.4x.\n",
				  pkt_len, rx_status);
			if (skb != NULL) {
				skb_reserve(skb, 2);
				insl(ioaddr+RX_FIFO, skb_put(skb, pkt_len),
						((pkt_len+3)>>2));
				skb->protocol = eth_type_trans(skb, dev);
				netif_rx(skb);
				dev->stats.rx_packets++;
				dev->stats.rx_bytes += pkt_len;
			} else {
				pr_debug("%s: couldn't allocate a sk_buff of"
					  " size %d.\n", dev->name, pkt_len);
				dev->stats.rx_dropped++;
			}
		}
		tc574_wait_for_completion(dev, RxDiscard);
	}

	return worklimit;
}

/* Provide ioctl() calls to examine the MII xcvr state. */
static int el3_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	struct el3_private *lp = netdev_priv(dev);
	unsigned int ioaddr = dev->base_addr;
	struct mii_ioctl_data *data = if_mii(rq);
	int phy = lp->phys & 0x1f;

	pr_debug("%s: In ioct(%-.6s, %#4.4x) %4.4x %4.4x %4.4x %4.4x.\n",
		  dev->name, rq->ifr_ifrn.ifrn_name, cmd,
		  data->phy_id, data->reg_num, data->val_in, data->val_out);

	switch(cmd) {
	case SIOCGMIIPHY:		/* Get the address of the PHY in use. */
		data->phy_id = phy;
	case SIOCGMIIREG:		/* Read the specified MII register. */
		{
			int saved_window;
			unsigned long flags;

			spin_lock_irqsave(&lp->window_lock, flags);
			saved_window = inw(ioaddr + EL3_CMD) >> 13;
			EL3WINDOW(4);
			data->val_out = mdio_read(ioaddr, data->phy_id & 0x1f,
						  data->reg_num & 0x1f);
			EL3WINDOW(saved_window);
			spin_unlock_irqrestore(&lp->window_lock, flags);
			return 0;
		}
	case SIOCSMIIREG:		/* Write the specified MII register */
		{
			int saved_window;
                       unsigned long flags;

			spin_lock_irqsave(&lp->window_lock, flags);
			saved_window = inw(ioaddr + EL3_CMD) >> 13;
			EL3WINDOW(4);
			mdio_write(ioaddr, data->phy_id & 0x1f,
				   data->reg_num & 0x1f, data->val_in);
			EL3WINDOW(saved_window);
			spin_unlock_irqrestore(&lp->window_lock, flags);
			return 0;
		}
	default:
		return -EOPNOTSUPP;
	}
}

/* The Odie chip has a 64 bin multicast filter, but the bit layout is not
   documented.  Until it is we revert to receiving all multicast frames when
   any multicast reception is desired.
   Note: My other drivers emit a log message whenever promiscuous mode is
   entered to help detect password sniffers.  This is less desirable on
   typical PC card machines, so we omit the message.
   */

static void set_rx_mode(struct net_device *dev)
{
	unsigned int ioaddr = dev->base_addr;

	if (dev->flags & IFF_PROMISC)
		outw(SetRxFilter | RxStation | RxMulticast | RxBroadcast | RxProm,
			 ioaddr + EL3_CMD);
	else if (!netdev_mc_empty(dev) || (dev->flags & IFF_ALLMULTI))
		outw(SetRxFilter|RxStation|RxMulticast|RxBroadcast, ioaddr + EL3_CMD);
	else
		outw(SetRxFilter | RxStation | RxBroadcast, ioaddr + EL3_CMD);
}

static void set_multicast_list(struct net_device *dev)
{
	struct el3_private *lp = netdev_priv(dev);
	unsigned long flags;

	spin_lock_irqsave(&lp->window_lock, flags);
	set_rx_mode(dev);
	spin_unlock_irqrestore(&lp->window_lock, flags);
}

static int el3_close(struct net_device *dev)
{
	unsigned int ioaddr = dev->base_addr;
	struct el3_private *lp = netdev_priv(dev);
	struct pcmcia_device *link = lp->p_dev;

	dev_dbg(&link->dev, "%s: shutting down ethercard.\n", dev->name);
	
	if (pcmcia_dev_present(link)) {
		unsigned long flags;

		/* Turn off statistics ASAP.  We update lp->stats below. */
		outw(StatsDisable, ioaddr + EL3_CMD);
		
		/* Disable the receiver and transmitter. */
		outw(RxDisable, ioaddr + EL3_CMD);
		outw(TxDisable, ioaddr + EL3_CMD);
		
		/* Note: Switching to window 0 may disable the IRQ. */
		EL3WINDOW(0);
		spin_lock_irqsave(&lp->window_lock, flags);
		update_stats(dev);
		spin_unlock_irqrestore(&lp->window_lock, flags);

		/* force interrupts off */
		outw(SetIntrEnb | 0x0000, ioaddr + EL3_CMD);
	}

	link->open--;
	netif_stop_queue(dev);
	del_timer_sync(&lp->media);

	return 0;
}

static const struct pcmcia_device_id tc574_ids[] = {
	PCMCIA_DEVICE_MANF_CARD(0x0101, 0x0574),
	PCMCIA_MFC_DEVICE_CIS_MANF_CARD(0, 0x0101, 0x0556, "cis/3CCFEM556.cis"),
	PCMCIA_DEVICE_NULL,
};
MODULE_DEVICE_TABLE(pcmcia, tc574_ids);

static struct pcmcia_driver tc574_driver = {
	.owner		= THIS_MODULE,
	.name		= "3c574_cs",
	.probe		= tc574_probe,
	.remove		= tc574_detach,
	.id_table       = tc574_ids,
	.suspend	= tc574_suspend,
	.resume		= tc574_resume,
};

static int __init init_tc574(void)
{
	return pcmcia_register_driver(&tc574_driver);
}

static void __exit exit_tc574(void)
{
	pcmcia_unregister_driver(&tc574_driver);
}

module_init(init_tc574);
module_exit(exit_tc574);
OpenPOWER on IntegriCloud