summaryrefslogtreecommitdiffstats
path: root/drivers/net/appletalk/ltpc.c
blob: e69eead12ec715cd7fb610218bee4129e0f88129 (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
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
/***    ltpc.c -- a driver for the LocalTalk PC card.
 *
 *      Copyright (c) 1995,1996 Bradford W. Johnson <johns393@maroon.tc.umn.edu>
 *
 *      This software may be used and distributed according to the terms
 *      of the GNU General Public License, incorporated herein by reference.
 *
 *      This is ALPHA code at best.  It may not work for you.  It may
 *      damage your equipment.  It may damage your relations with other
 *      users of your network.  Use it at your own risk!
 *
 *      Based in part on:
 *      skeleton.c      by Donald Becker
 *      dummy.c         by Nick Holloway and Alan Cox
 *      loopback.c      by Ross Biro, Fred van Kampen, Donald Becker
 *      the netatalk source code (UMICH)
 *      lots of work on the card...
 *
 *      I do not have access to the (proprietary) SDK that goes with the card.
 *      If you do, I don't want to know about it, and you can probably write
 *      a better driver yourself anyway.  This does mean that the pieces that
 *      talk to the card are guesswork on my part, so use at your own risk!
 *
 *      This is my first try at writing Linux networking code, and is also
 *      guesswork.  Again, use at your own risk!  (Although on this part, I'd
 *      welcome suggestions)
 *
 *      This is a loadable kernel module which seems to work at my site
 *      consisting of a 1.2.13 linux box running netatalk 1.3.3, and with
 *      the kernel support from 1.3.3b2 including patches routing.patch
 *      and ddp.disappears.from.chooser.  In order to run it, you will need
 *      to patch ddp.c and aarp.c in the kernel, but only a little...
 *
 *      I'm fairly confident that while this is arguably badly written, the
 *      problems that people experience will be "higher level", that is, with
 *      complications in the netatalk code.  The driver itself doesn't do
 *      anything terribly complicated -- it pretends to be an ether device
 *      as far as netatalk is concerned, strips the DDP data out of the ether
 *      frame and builds a LLAP packet to send out the card.  In the other
 *      direction, it receives LLAP frames from the card and builds a fake
 *      ether packet that it then tosses up to the networking code.  You can
 *      argue (correctly) that this is an ugly way to do things, but it
 *      requires a minimal amount of fooling with the code in ddp.c and aarp.c.
 *
 *      The card will do a lot more than is used here -- I *think* it has the
 *      layers up through ATP.  Even if you knew how that part works (which I
 *      don't) it would be a big job to carve up the kernel ddp code to insert
 *      things at a higher level, and probably a bad idea...
 *
 *      There are a number of other cards that do LocalTalk on the PC.  If
 *      nobody finds any insurmountable (at the netatalk level) problems
 *      here, this driver should encourage people to put some work into the
 *      other cards (some of which I gather are still commercially available)
 *      and also to put hooks for LocalTalk into the official ddp code.
 *
 *      I welcome comments and suggestions.  This is my first try at Linux
 *      networking stuff, and there are probably lots of things that I did
 *      suboptimally.  
 *
 ***/

/***
 *
 * $Log: ltpc.c,v $
 * Revision 1.1.2.1  2000/03/01 05:35:07  jgarzik
 * at and tr cleanup
 *
 * Revision 1.8  1997/01/28 05:44:54  bradford
 * Clean up for non-module a little.
 * Hacked about a bit to clean things up - Alan Cox 
 * Probably broken it from the origina 1.8
 *

 * 1998/11/09: David Huggins-Daines <dhd@debian.org>
 * Cleaned up the initialization code to use the standard autoirq methods,
   and to probe for things in the standard order of i/o, irq, dma.  This
   removes the "reset the reset" hack, because I couldn't figure out an
   easy way to get the card to trigger an interrupt after it.
 * Added support for passing configuration parameters on the kernel command
   line and through insmod
 * Changed the device name from "ltalk0" to "lt0", both to conform with the
   other localtalk driver, and to clear up the inconsistency between the
   module and the non-module versions of the driver :-)
 * Added a bunch of comments (I was going to make some enums for the state
   codes and the register offsets, but I'm still not sure exactly what their
   semantics are)
 * Don't poll anymore in interrupt-driven mode
 * It seems to work as a module now (as of 2.1.127), but I don't think
   I'm responsible for that...

 *
 * Revision 1.7  1996/12/12 03:42:33  bradford
 * DMA alloc cribbed from 3c505.c.
 *
 * Revision 1.6  1996/12/12 03:18:58  bradford
 * Added virt_to_bus; works in 2.1.13.
 *
 * Revision 1.5  1996/12/12 03:13:22  root
 * xmitQel initialization -- think through better though.
 *
 * Revision 1.4  1996/06/18 14:55:55  root
 * Change names to ltpc. Tabs. Took a shot at dma alloc,
 * although more needs to be done eventually.
 *
 * Revision 1.3  1996/05/22 14:59:39  root
 * Change dev->open, dev->close to track dummy.c in 1.99.(around 7)
 *
 * Revision 1.2  1996/05/22 14:58:24  root
 * Change tabs mostly.
 *
 * Revision 1.1  1996/04/23 04:45:09  root
 * Initial revision
 *
 * Revision 0.16  1996/03/05 15:59:56  root
 * Change ARPHRD_LOCALTLK definition to the "real" one.
 *
 * Revision 0.15  1996/03/05 06:28:30  root
 * Changes for kernel 1.3.70.  Still need a few patches to kernel, but
 * it's getting closer.
 *
 * Revision 0.14  1996/02/25 17:38:32  root
 * More cleanups.  Removed query to card on get_stats.
 *
 * Revision 0.13  1996/02/21  16:27:40  root
 * Refix debug_print_skb.  Fix mac.raw gotcha that appeared in 1.3.65.
 * Clean up receive code a little.
 *
 * Revision 0.12  1996/02/19  16:34:53  root
 * Fix debug_print_skb.  Kludge outgoing snet to 0 when using startup
 * range.  Change debug to mask: 1 for verbose, 2 for higher level stuff
 * including packet printing, 4 for lower level (card i/o) stuff.
 *
 * Revision 0.11  1996/02/12  15:53:38  root
 * Added router sends (requires new aarp.c patch)
 *
 * Revision 0.10  1996/02/11  00:19:35  root
 * Change source LTALK_LOGGING debug switch to insmod ... debug=2.
 *
 * Revision 0.9  1996/02/10  23:59:35  root
 * Fixed those fixes for 1.2 -- DANGER!  The at.h that comes with netatalk
 * has a *different* definition of struct sockaddr_at than the Linux kernel
 * does.  This is an "insidious and invidious" bug...
 * (Actually the preceding comment is false -- it's the atalk.h in the
 * ancient atalk-0.06 that's the problem)
 *
 * Revision 0.8  1996/02/10 19:09:00  root
 * Merge 1.3 changes.  Tested OK under 1.3.60.
 *
 * Revision 0.7  1996/02/10 17:56:56  root
 * Added debug=1 parameter on insmod for debugging prints.  Tried
 * to fix timer unload on rmmod, but I don't think that's the problem.
 *
 * Revision 0.6  1995/12/31  19:01:09  root
 * Clean up rmmod, irq comments per feedback from Corin Anderson (Thanks Corey!)
 * Clean up initial probing -- sometimes the card wakes up latched in reset.
 *
 * Revision 0.5  1995/12/22  06:03:44  root
 * Added comments in front and cleaned up a bit.
 * This version sent out to people.
 *
 * Revision 0.4  1995/12/18  03:46:44  root
 * Return shortDDP to longDDP fake to 0/0.  Added command structs.
 *
 ***/

/* ltpc jumpers are:
*
*	Interrupts -- set at most one.  If none are set, the driver uses
*	polled mode.  Because the card was developed in the XT era, the
*	original documentation refers to IRQ2.  Since you'll be running
*	this on an AT (or later) class machine, that really means IRQ9.
*
*	SW1	IRQ 4
*	SW2	IRQ 3
*	SW3	IRQ 9 (2 in original card documentation only applies to XT)
*
*
*	DMA -- choose DMA 1 or 3, and set both corresponding switches.
*
*	SW4	DMA 3
*	SW5	DMA 1
*	SW6	DMA 3
*	SW7	DMA 1
*
*
*	I/O address -- choose one.  
*
*	SW8	220 / 240
*/

/*	To have some stuff logged, do 
*	insmod ltpc.o debug=1
*
*	For a whole bunch of stuff, use higher numbers.
*
*	The default is 0, i.e. no messages except for the probe results.
*/

/* insmod-tweakable variables */
static int debug;
#define DEBUG_VERBOSE 1
#define DEBUG_UPPER 2
#define DEBUG_LOWER 4

static int io;
static int irq;
static int dma;

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/spinlock.h>
#include <linux/in.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/if_ltalk.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/atalk.h>
#include <linux/bitops.h>
#include <linux/gfp.h>

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

/* our stuff */
#include "ltpc.h"

static DEFINE_SPINLOCK(txqueue_lock);
static DEFINE_SPINLOCK(mbox_lock);

/* function prototypes */
static int do_read(struct net_device *dev, void *cbuf, int cbuflen,
	void *dbuf, int dbuflen);
static int sendup_buffer (struct net_device *dev);

/* Dma Memory related stuff, cribbed directly from 3c505.c */

static unsigned long dma_mem_alloc(int size)
{
        int order = get_order(size);

        return __get_dma_pages(GFP_KERNEL, order);
}

/* DMA data buffer, DMA command buffer */
static unsigned char *ltdmabuf;
static unsigned char *ltdmacbuf;

/* private struct, holds our appletalk address */

struct ltpc_private
{
	struct atalk_addr my_addr;
};

/* transmit queue element struct */

struct xmitQel {
	struct xmitQel *next;
	/* command buffer */
	unsigned char *cbuf;
	short cbuflen;
	/* data buffer */
	unsigned char *dbuf;
	short dbuflen;
	unsigned char QWrite;	/* read or write data */
	unsigned char mailbox;
};

/* the transmit queue itself */

static struct xmitQel *xmQhd, *xmQtl;

static void enQ(struct xmitQel *qel)
{
	unsigned long flags;
	qel->next = NULL;
	
	spin_lock_irqsave(&txqueue_lock, flags);
	if (xmQtl) {
		xmQtl->next = qel;
	} else {
		xmQhd = qel;
	}
	xmQtl = qel;
	spin_unlock_irqrestore(&txqueue_lock, flags);

	if (debug & DEBUG_LOWER)
		printk("enqueued a 0x%02x command\n",qel->cbuf[0]);
}

static struct xmitQel *deQ(void)
{
	unsigned long flags;
	int i;
	struct xmitQel *qel=NULL;
	
	spin_lock_irqsave(&txqueue_lock, flags);
	if (xmQhd) {
		qel = xmQhd;
		xmQhd = qel->next;
		if(!xmQhd) xmQtl = NULL;
	}
	spin_unlock_irqrestore(&txqueue_lock, flags);

	if ((debug & DEBUG_LOWER) && qel) {
		int n;
		printk(KERN_DEBUG "ltpc: dequeued command ");
		n = qel->cbuflen;
		if (n>100) n=100;
		for(i=0;i<n;i++) printk("%02x ",qel->cbuf[i]);
		printk("\n");
	}

	return qel;
}

/* and... the queue elements we'll be using */
static struct xmitQel qels[16];

/* and their corresponding mailboxes */
static unsigned char mailbox[16];
static unsigned char mboxinuse[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

static int wait_timeout(struct net_device *dev, int c)
{
	/* returns true if it stayed c */
	/* this uses base+6, but it's ok */
	int i;

	/* twenty second or so total */

	for(i=0;i<200000;i++) {
		if ( c != inb_p(dev->base_addr+6) ) return 0;
		udelay(100);
	}
	return 1; /* timed out */
}

/* get the first free mailbox */

static int getmbox(void)
{
	unsigned long flags;
	int i;

	spin_lock_irqsave(&mbox_lock, flags);
	for(i=1;i<16;i++) if(!mboxinuse[i]) {
		mboxinuse[i]=1;
		spin_unlock_irqrestore(&mbox_lock, flags);
		return i;
	}
	spin_unlock_irqrestore(&mbox_lock, flags);
	return 0;
}

/* read a command from the card */
static void handlefc(struct net_device *dev)
{
	/* called *only* from idle, non-reentrant */
	int dma = dev->dma;
	int base = dev->base_addr;
	unsigned long flags;


	flags=claim_dma_lock();
	disable_dma(dma);
	clear_dma_ff(dma);
	set_dma_mode(dma,DMA_MODE_READ);
	set_dma_addr(dma,virt_to_bus(ltdmacbuf));
	set_dma_count(dma,50);
	enable_dma(dma);
	release_dma_lock(flags);

	inb_p(base+3);
	inb_p(base+2);

	if ( wait_timeout(dev,0xfc) ) printk("timed out in handlefc\n");
}

/* read data from the card */
static void handlefd(struct net_device *dev)
{
	int dma = dev->dma;
	int base = dev->base_addr;
	unsigned long flags;

	flags=claim_dma_lock();
	disable_dma(dma);
	clear_dma_ff(dma);
	set_dma_mode(dma,DMA_MODE_READ);
	set_dma_addr(dma,virt_to_bus(ltdmabuf));
	set_dma_count(dma,800);
	enable_dma(dma);
	release_dma_lock(flags);

	inb_p(base+3);
	inb_p(base+2);

	if ( wait_timeout(dev,0xfd) ) printk("timed out in handlefd\n");
	sendup_buffer(dev);
} 

static void handlewrite(struct net_device *dev)
{
	/* called *only* from idle, non-reentrant */
	/* on entry, 0xfb and ltdmabuf holds data */
	int dma = dev->dma;
	int base = dev->base_addr;
	unsigned long flags;
	
	flags=claim_dma_lock();
	disable_dma(dma);
	clear_dma_ff(dma);
	set_dma_mode(dma,DMA_MODE_WRITE);
	set_dma_addr(dma,virt_to_bus(ltdmabuf));
	set_dma_count(dma,800);
	enable_dma(dma);
	release_dma_lock(flags);
	
	inb_p(base+3);
	inb_p(base+2);

	if ( wait_timeout(dev,0xfb) ) {
		flags=claim_dma_lock();
		printk("timed out in handlewrite, dma res %d\n",
			get_dma_residue(dev->dma) );
		release_dma_lock(flags);
	}
}

static void handleread(struct net_device *dev)
{
	/* on entry, 0xfb */
	/* on exit, ltdmabuf holds data */
	int dma = dev->dma;
	int base = dev->base_addr;
	unsigned long flags;

	
	flags=claim_dma_lock();
	disable_dma(dma);
	clear_dma_ff(dma);
	set_dma_mode(dma,DMA_MODE_READ);
	set_dma_addr(dma,virt_to_bus(ltdmabuf));
	set_dma_count(dma,800);
	enable_dma(dma);
	release_dma_lock(flags);

	inb_p(base+3);
	inb_p(base+2);
	if ( wait_timeout(dev,0xfb) ) printk("timed out in handleread\n");
}

static void handlecommand(struct net_device *dev)
{
	/* on entry, 0xfa and ltdmacbuf holds command */
	int dma = dev->dma;
	int base = dev->base_addr;
	unsigned long flags;

	flags=claim_dma_lock();
	disable_dma(dma);
	clear_dma_ff(dma);
	set_dma_mode(dma,DMA_MODE_WRITE);
	set_dma_addr(dma,virt_to_bus(ltdmacbuf));
	set_dma_count(dma,50);
	enable_dma(dma);
	release_dma_lock(flags);
	inb_p(base+3);
	inb_p(base+2);
	if ( wait_timeout(dev,0xfa) ) printk("timed out in handlecommand\n");
} 

/* ready made command for getting the result from the card */
static unsigned char rescbuf[2] = {LT_GETRESULT,0};
static unsigned char resdbuf[2];

static int QInIdle;

/* idle expects to be called with the IRQ line high -- either because of
 * an interrupt, or because the line is tri-stated
 */

static void idle(struct net_device *dev)
{
	unsigned long flags;
	int state;
	/* FIXME This is initialized to shut the warning up, but I need to
	 * think this through again.
	 */
	struct xmitQel *q = NULL;
	int oops;
	int i;
	int base = dev->base_addr;

	spin_lock_irqsave(&txqueue_lock, flags);
	if(QInIdle) {
		spin_unlock_irqrestore(&txqueue_lock, flags);
		return;
	}
	QInIdle = 1;
	spin_unlock_irqrestore(&txqueue_lock, flags);

	/* this tri-states the IRQ line */
	(void) inb_p(base+6);

	oops = 100;

loop:
	if (0>oops--) { 
		printk("idle: looped too many times\n");
		goto done;
	}

	state = inb_p(base+6);
	if (state != inb_p(base+6)) goto loop;

	switch(state) {
		case 0xfc:
			/* incoming command */
			if (debug & DEBUG_LOWER) printk("idle: fc\n");
			handlefc(dev); 
			break;
		case 0xfd:
			/* incoming data */
			if(debug & DEBUG_LOWER) printk("idle: fd\n");
			handlefd(dev); 
			break;
		case 0xf9:
			/* result ready */
			if (debug & DEBUG_LOWER) printk("idle: f9\n");
			if(!mboxinuse[0]) {
				mboxinuse[0] = 1;
				qels[0].cbuf = rescbuf;
				qels[0].cbuflen = 2;
				qels[0].dbuf = resdbuf;
				qels[0].dbuflen = 2;
				qels[0].QWrite = 0;
				qels[0].mailbox = 0;
				enQ(&qels[0]);
			}
			inb_p(dev->base_addr+1);
			inb_p(dev->base_addr+0);
			if( wait_timeout(dev,0xf9) )
				printk("timed out idle f9\n");
			break;
		case 0xf8:
			/* ?? */
			if (xmQhd) {
				inb_p(dev->base_addr+1);
				inb_p(dev->base_addr+0);
				if(wait_timeout(dev,0xf8) )
					printk("timed out idle f8\n");
			} else {
				goto done;
			}
			break;
		case 0xfa:
			/* waiting for command */
			if(debug & DEBUG_LOWER) printk("idle: fa\n");
			if (xmQhd) {
				q=deQ();
				memcpy(ltdmacbuf,q->cbuf,q->cbuflen);
				ltdmacbuf[1] = q->mailbox;
				if (debug>1) { 
					int n;
					printk("ltpc: sent command     ");
					n = q->cbuflen;
					if (n>100) n=100;
					for(i=0;i<n;i++)
						printk("%02x ",ltdmacbuf[i]);
					printk("\n");
				}
				handlecommand(dev);
					if(0xfa==inb_p(base+6)) {
						/* we timed out, so return */
						goto done;
					} 
			} else {
				/* we don't seem to have a command */
				if (!mboxinuse[0]) {
					mboxinuse[0] = 1;
					qels[0].cbuf = rescbuf;
					qels[0].cbuflen = 2;
					qels[0].dbuf = resdbuf;
					qels[0].dbuflen = 2;
					qels[0].QWrite = 0;
					qels[0].mailbox = 0;
					enQ(&qels[0]);
				} else {
					printk("trouble: response command already queued\n");
					goto done;
				}
			} 
			break;
		case 0Xfb:
			/* data transfer ready */
			if(debug & DEBUG_LOWER) printk("idle: fb\n");
			if(q->QWrite) {
				memcpy(ltdmabuf,q->dbuf,q->dbuflen);
				handlewrite(dev);
			} else {
				handleread(dev);
				/* non-zero mailbox numbers are for
				   commmands, 0 is for GETRESULT
				   requests */
				if(q->mailbox) {
					memcpy(q->dbuf,ltdmabuf,q->dbuflen);
				} else { 
					/* this was a result */
					mailbox[ 0x0f & ltdmabuf[0] ] = ltdmabuf[1];
					mboxinuse[0]=0;
				}
			}
			break;
	}
	goto loop;

done:
	QInIdle=0;

	/* now set the interrupts back as appropriate */
	/* the first read takes it out of tri-state (but still high) */
	/* the second resets it */
	/* note that after this point, any read of base+6 will
	   trigger an interrupt */

	if (dev->irq) {
		inb_p(base+7);
		inb_p(base+7);
	}
}


static int do_write(struct net_device *dev, void *cbuf, int cbuflen,
	void *dbuf, int dbuflen)
{

	int i = getmbox();
	int ret;

	if(i) {
		qels[i].cbuf = (unsigned char *) cbuf;
		qels[i].cbuflen = cbuflen;
		qels[i].dbuf = (unsigned char *) dbuf;
		qels[i].dbuflen = dbuflen;
		qels[i].QWrite = 1;
		qels[i].mailbox = i;  /* this should be initted rather */
		enQ(&qels[i]);
		idle(dev);
		ret = mailbox[i];
		mboxinuse[i]=0;
		return ret;
	}
	printk("ltpc: could not allocate mbox\n");
	return -1;
}

static int do_read(struct net_device *dev, void *cbuf, int cbuflen,
	void *dbuf, int dbuflen)
{

	int i = getmbox();
	int ret;

	if(i) {
		qels[i].cbuf = (unsigned char *) cbuf;
		qels[i].cbuflen = cbuflen;
		qels[i].dbuf = (unsigned char *) dbuf;
		qels[i].dbuflen = dbuflen;
		qels[i].QWrite = 0;
		qels[i].mailbox = i;  /* this should be initted rather */
		enQ(&qels[i]);
		idle(dev);
		ret = mailbox[i];
		mboxinuse[i]=0;
		return ret;
	}
	printk("ltpc: could not allocate mbox\n");
	return -1;
}

/* end of idle handlers -- what should be seen is do_read, do_write */

static struct timer_list ltpc_timer;

static netdev_tx_t ltpc_xmit(struct sk_buff *skb, struct net_device *dev);

static int read_30 ( struct net_device *dev)
{
	lt_command c;
	c.getflags.command = LT_GETFLAGS;
	return do_read(dev, &c, sizeof(c.getflags),&c,0);
}

static int set_30 (struct net_device *dev,int x)
{
	lt_command c;
	c.setflags.command = LT_SETFLAGS;
	c.setflags.flags = x;
	return do_write(dev, &c, sizeof(c.setflags),&c,0);
}

/* LLAP to DDP translation */

static int sendup_buffer (struct net_device *dev)
{
	/* on entry, command is in ltdmacbuf, data in ltdmabuf */
	/* called from idle, non-reentrant */

	int dnode, snode, llaptype, len; 
	int sklen;
	struct sk_buff *skb;
	struct lt_rcvlap *ltc = (struct lt_rcvlap *) ltdmacbuf;

	if (ltc->command != LT_RCVLAP) {
		printk("unknown command 0x%02x from ltpc card\n",ltc->command);
		return -1;
	}
	dnode = ltc->dnode;
	snode = ltc->snode;
	llaptype = ltc->laptype;
	len = ltc->length; 

	sklen = len;
	if (llaptype == 1) 
		sklen += 8;  /* correct for short ddp */
	if(sklen > 800) {
		printk(KERN_INFO "%s: nonsense length in ltpc command 0x14: 0x%08x\n",
			dev->name,sklen);
		return -1;
	}

	if ( (llaptype==0) || (llaptype>2) ) {
		printk(KERN_INFO "%s: unknown LLAP type: %d\n",dev->name,llaptype);
		return -1;
	}


	skb = dev_alloc_skb(3+sklen);
	if (skb == NULL) 
	{
		printk("%s: dropping packet due to memory squeeze.\n",
			dev->name);
		return -1;
	}
	skb->dev = dev;

	if (sklen > len)
		skb_reserve(skb,8);
	skb_put(skb,len+3);
	skb->protocol = htons(ETH_P_LOCALTALK);
	/* add LLAP header */
	skb->data[0] = dnode;
	skb->data[1] = snode;
	skb->data[2] = llaptype;
	skb_reset_mac_header(skb);	/* save pointer to llap header */
	skb_pull(skb,3);

	/* copy ddp(s,e)hdr + contents */
	skb_copy_to_linear_data(skb, ltdmabuf, len);

	skb_reset_transport_header(skb);

	dev->stats.rx_packets++;
	dev->stats.rx_bytes += skb->len;

	/* toss it onwards */
	netif_rx(skb);
	return 0;
}

/* the handler for the board interrupt */
 
static irqreturn_t
ltpc_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;

	if (dev==NULL) {
		printk("ltpc_interrupt: unknown device.\n");
		return IRQ_NONE;
	}

	inb_p(dev->base_addr+6);  /* disable further interrupts from board */

	idle(dev); /* handle whatever is coming in */
 
	/* idle re-enables interrupts from board */ 

	return IRQ_HANDLED;
}

/***
 *
 *    The ioctls that the driver responds to are:
 *
 *    SIOCSIFADDR -- do probe using the passed node hint.
 *    SIOCGIFADDR -- return net, node.
 *
 *    some of this stuff should be done elsewhere.
 *
 ***/

static int ltpc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
	struct sockaddr_at *sa = (struct sockaddr_at *) &ifr->ifr_addr;
	/* we'll keep the localtalk node address in dev->pa_addr */
	struct ltpc_private *ltpc_priv = netdev_priv(dev);
	struct atalk_addr *aa = &ltpc_priv->my_addr;
	struct lt_init c;
	int ltflags;

	if(debug & DEBUG_VERBOSE) printk("ltpc_ioctl called\n");

	switch(cmd) {
		case SIOCSIFADDR:

			aa->s_net  = sa->sat_addr.s_net;
      
			/* this does the probe and returns the node addr */
			c.command = LT_INIT;
			c.hint = sa->sat_addr.s_node;

			aa->s_node = do_read(dev,&c,sizeof(c),&c,0);

			/* get all llap frames raw */
			ltflags = read_30(dev);
			ltflags |= LT_FLAG_ALLLAP;
			set_30 (dev,ltflags);  

			dev->broadcast[0] = 0xFF;
			dev->dev_addr[0] = aa->s_node;

			dev->addr_len=1;
   
			return 0;

		case SIOCGIFADDR:

			sa->sat_addr.s_net = aa->s_net;
			sa->sat_addr.s_node = aa->s_node;

			return 0;

		default: 
			return -EINVAL;
	}
}

static void set_multicast_list(struct net_device *dev)
{
	/* This needs to be present to keep netatalk happy. */
	/* Actually netatalk needs fixing! */
}

static int ltpc_poll_counter;

static void ltpc_poll(unsigned long l)
{
	struct net_device *dev = (struct net_device *) l;

	del_timer(&ltpc_timer);

	if(debug & DEBUG_VERBOSE) {
		if (!ltpc_poll_counter) {
			ltpc_poll_counter = 50;
			printk("ltpc poll is alive\n");
		}
		ltpc_poll_counter--;
	}
  
	if (!dev)
		return;  /* we've been downed */

	/* poll 20 times per second */
	idle(dev);
	ltpc_timer.expires = jiffies + HZ/20;
	
	add_timer(&ltpc_timer);
}

/* DDP to LLAP translation */

static netdev_tx_t ltpc_xmit(struct sk_buff *skb, struct net_device *dev)
{
	/* in kernel 1.3.xx, on entry skb->data points to ddp header,
	 * and skb->len is the length of the ddp data + ddp header
	 */
	int i;
	struct lt_sendlap cbuf;
	unsigned char *hdr;

	cbuf.command = LT_SENDLAP;
	cbuf.dnode = skb->data[0];
	cbuf.laptype = skb->data[2];
	skb_pull(skb,3);	/* skip past LLAP header */
	cbuf.length = skb->len;	/* this is host order */
	skb_reset_transport_header(skb);

	if(debug & DEBUG_UPPER) {
		printk("command ");
		for(i=0;i<6;i++)
			printk("%02x ",((unsigned char *)&cbuf)[i]);
		printk("\n");
	}

	hdr = skb_transport_header(skb);
	do_write(dev, &cbuf, sizeof(cbuf), hdr, skb->len);

	if(debug & DEBUG_UPPER) {
		printk("sent %d ddp bytes\n",skb->len);
		for (i = 0; i < skb->len; i++)
			printk("%02x ", hdr[i]);
		printk("\n");
	}

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

	dev_kfree_skb(skb);
	return NETDEV_TX_OK;
}

/* initialization stuff */
  
static int __init ltpc_probe_dma(int base, int dma)
{
	int want = (dma == 3) ? 2 : (dma == 1) ? 1 : 3;
  	unsigned long timeout;
  	unsigned long f;
  
  	if (want & 1) {
		if (request_dma(1,"ltpc")) {
			want &= ~1;
		} else {
			f=claim_dma_lock();
			disable_dma(1);
			clear_dma_ff(1);
			set_dma_mode(1,DMA_MODE_WRITE);
			set_dma_addr(1,virt_to_bus(ltdmabuf));
			set_dma_count(1,sizeof(struct lt_mem));
			enable_dma(1);
			release_dma_lock(f);
		}
	}
	if (want & 2) {
		if (request_dma(3,"ltpc")) {
			want &= ~2;
		} else {
			f=claim_dma_lock();
			disable_dma(3);
			clear_dma_ff(3);
			set_dma_mode(3,DMA_MODE_WRITE);
			set_dma_addr(3,virt_to_bus(ltdmabuf));
			set_dma_count(3,sizeof(struct lt_mem));
			enable_dma(3);
			release_dma_lock(f);
		}
	}
	/* set up request */

	/* FIXME -- do timings better! */

	ltdmabuf[0] = LT_READMEM;
	ltdmabuf[1] = 1;  /* mailbox */
	ltdmabuf[2] = 0; ltdmabuf[3] = 0;  /* address */
	ltdmabuf[4] = 0; ltdmabuf[5] = 1;  /* read 0x0100 bytes */
	ltdmabuf[6] = 0; /* dunno if this is necessary */

	inb_p(io+1);
	inb_p(io+0);
	timeout = jiffies+100*HZ/100;
	while(time_before(jiffies, timeout)) {
		if ( 0xfa == inb_p(io+6) ) break;
	}

	inb_p(io+3);
	inb_p(io+2);
	while(time_before(jiffies, timeout)) {
		if ( 0xfb == inb_p(io+6) ) break;
	}

	/* release the other dma channel (if we opened both of them) */

	if ((want & 2) && (get_dma_residue(3)==sizeof(struct lt_mem))) {
		want &= ~2;
		free_dma(3);
	}

	if ((want & 1) && (get_dma_residue(1)==sizeof(struct lt_mem))) {
		want &= ~1;
		free_dma(1);
	}

	if (!want)
		return 0;

	return (want & 2) ? 3 : 1;
}

static const struct net_device_ops ltpc_netdev = {
	.ndo_start_xmit		= ltpc_xmit,
	.ndo_do_ioctl		= ltpc_ioctl,
	.ndo_set_multicast_list = set_multicast_list,
};

struct net_device * __init ltpc_probe(void)
{
	struct net_device *dev;
	int err = -ENOMEM;
	int x=0,y=0;
	int autoirq;
	unsigned long f;
	unsigned long timeout;

	dev = alloc_ltalkdev(sizeof(struct ltpc_private));
	if (!dev)
		goto out;

	/* probe for the I/O port address */
	
	if (io != 0x240 && request_region(0x220,8,"ltpc")) {
		x = inb_p(0x220+6);
		if ( (x!=0xff) && (x>=0xf0) ) {
			io = 0x220;
			goto got_port;
		}
		release_region(0x220,8);
	}
	if (io != 0x220 && request_region(0x240,8,"ltpc")) {
		y = inb_p(0x240+6);
		if ( (y!=0xff) && (y>=0xf0) ){ 
			io = 0x240;
			goto got_port;
		}
		release_region(0x240,8);
	} 

	/* give up in despair */
	printk(KERN_ERR "LocalTalk card not found; 220 = %02x, 240 = %02x.\n", x,y);
	err = -ENODEV;
	goto out1;

 got_port:
	/* probe for the IRQ line */
	if (irq < 2) {
		unsigned long irq_mask;

		irq_mask = probe_irq_on();
		/* reset the interrupt line */
		inb_p(io+7);
		inb_p(io+7);
		/* trigger an interrupt (I hope) */
		inb_p(io+6);
		mdelay(2);
		autoirq = probe_irq_off(irq_mask);

		if (autoirq == 0) {
			printk(KERN_ERR "ltpc: probe at %#x failed to detect IRQ line.\n", io);
		} else {
			irq = autoirq;
		}
	}

	/* allocate a DMA buffer */
	ltdmabuf = (unsigned char *) dma_mem_alloc(1000);
	if (!ltdmabuf) {
		printk(KERN_ERR "ltpc: mem alloc failed\n");
		err = -ENOMEM;
		goto out2;
	}

	ltdmacbuf = &ltdmabuf[800];

	if(debug & DEBUG_VERBOSE) {
		printk("ltdmabuf pointer %08lx\n",(unsigned long) ltdmabuf);
	}

	/* reset the card */

	inb_p(io+1);
	inb_p(io+3);

	msleep(20);

	inb_p(io+0);
	inb_p(io+2);
	inb_p(io+7); /* clear reset */
	inb_p(io+4); 
	inb_p(io+5);
	inb_p(io+5); /* enable dma */
	inb_p(io+6); /* tri-state interrupt line */

	ssleep(1);
	
	/* now, figure out which dma channel we're using, unless it's
	   already been specified */
	/* well, 0 is a legal DMA channel, but the LTPC card doesn't
	   use it... */
	dma = ltpc_probe_dma(io, dma);
	if (!dma) {  /* no dma channel */
		printk(KERN_ERR "No DMA channel found on ltpc card.\n");
		err = -ENODEV;
		goto out3;
	}

	/* print out friendly message */
	if(irq)
		printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, IR%d, DMA%d.\n",io,irq,dma);
	else
		printk(KERN_INFO "Apple/Farallon LocalTalk-PC card at %03x, DMA%d.  Using polled mode.\n",io,dma);

	dev->netdev_ops = &ltpc_netdev;
	dev->base_addr = io;
	dev->irq = irq;
	dev->dma = dma;

	/* the card will want to send a result at this point */
	/* (I think... leaving out this part makes the kernel crash,
           so I put it back in...) */

	f=claim_dma_lock();
	disable_dma(dma);
	clear_dma_ff(dma);
	set_dma_mode(dma,DMA_MODE_READ);
	set_dma_addr(dma,virt_to_bus(ltdmabuf));
	set_dma_count(dma,0x100);
	enable_dma(dma);
	release_dma_lock(f);

	(void) inb_p(io+3);
	(void) inb_p(io+2);
	timeout = jiffies+100*HZ/100;

	while(time_before(jiffies, timeout)) {
		if( 0xf9 == inb_p(io+6))
			break;
		schedule();
	}

	if(debug & DEBUG_VERBOSE) {
		printk("setting up timer and irq\n");
	}

	/* grab it and don't let go :-) */
	if (irq && request_irq( irq, ltpc_interrupt, 0, "ltpc", dev) >= 0)
	{
		(void) inb_p(io+7);  /* enable interrupts from board */
		(void) inb_p(io+7);  /* and reset irq line */
	} else {
		if( irq )
			printk(KERN_ERR "ltpc: IRQ already in use, using polled mode.\n");
		dev->irq = 0;
		/* polled mode -- 20 times per second */
		/* this is really, really slow... should it poll more often? */
		init_timer(&ltpc_timer);
		ltpc_timer.function=ltpc_poll;
		ltpc_timer.data = (unsigned long) dev;

		ltpc_timer.expires = jiffies + HZ/20;
		add_timer(&ltpc_timer);
	}
	err = register_netdev(dev);
	if (err)
		goto out4;

	return NULL;
out4:
	del_timer_sync(&ltpc_timer);
	if (dev->irq)
		free_irq(dev->irq, dev);
out3:
	free_pages((unsigned long)ltdmabuf, get_order(1000));
out2:
	release_region(io, 8);
out1:
	free_netdev(dev);
out:
	return ERR_PTR(err);
}

#ifndef MODULE
/* handles "ltpc=io,irq,dma" kernel command lines */
static int __init ltpc_setup(char *str)
{
	int ints[5];

	str = get_options(str, ARRAY_SIZE(ints), ints);

	if (ints[0] == 0) {
		if (str && !strncmp(str, "auto", 4)) {
			/* do nothing :-) */
		}
		else {
			/* usage message */
			printk (KERN_ERR
				"ltpc: usage: ltpc=auto|iobase[,irq[,dma]]\n");
			return 0;
		}
	} else {
		io = ints[1];
		if (ints[0] > 1) {
			irq = ints[2];
		}
		if (ints[0] > 2) {
			dma = ints[3];
		}
		/* ignore any other parameters */
	}
	return 1;
}

__setup("ltpc=", ltpc_setup);
#endif /* MODULE */

static struct net_device *dev_ltpc;

#ifdef MODULE

MODULE_LICENSE("GPL");
module_param(debug, int, 0);
module_param(io, int, 0);
module_param(irq, int, 0);
module_param(dma, int, 0);


static int __init ltpc_module_init(void)
{
        if(io == 0)
		printk(KERN_NOTICE
		       "ltpc: Autoprobing is not recommended for modules\n");

	dev_ltpc = ltpc_probe();
	if (IS_ERR(dev_ltpc))
		return PTR_ERR(dev_ltpc);
	return 0;
}
module_init(ltpc_module_init);
#endif

static void __exit ltpc_cleanup(void)
{

	if(debug & DEBUG_VERBOSE) printk("unregister_netdev\n");
	unregister_netdev(dev_ltpc);

	ltpc_timer.data = 0;  /* signal the poll routine that we're done */

	del_timer_sync(&ltpc_timer);

	if(debug & DEBUG_VERBOSE) printk("freeing irq\n");

	if (dev_ltpc->irq)
		free_irq(dev_ltpc->irq, dev_ltpc);

	if(debug & DEBUG_VERBOSE) printk("freeing dma\n");

	if (dev_ltpc->dma)
		free_dma(dev_ltpc->dma);

	if(debug & DEBUG_VERBOSE) printk("freeing ioaddr\n");

	if (dev_ltpc->base_addr)
		release_region(dev_ltpc->base_addr,8);

	free_netdev(dev_ltpc);

	if(debug & DEBUG_VERBOSE) printk("free_pages\n");

	free_pages( (unsigned long) ltdmabuf, get_order(1000));

	if(debug & DEBUG_VERBOSE) printk("returning from cleanup_module\n");
}

module_exit(ltpc_cleanup);
OpenPOWER on IntegriCloud