summaryrefslogtreecommitdiffstats
path: root/drivers/isdn/hisax/ipacx.c
blob: c7086c1534bdfa15b69a5fe696c61c5cc300a2ee (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
/*
 *
 * IPACX specific routines
 *
 * Author       Joerg Petersohn
 * Derived from hisax_isac.c, isac.c, hscx.c and others
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include "hisax_if.h"
#include "hisax.h"
#include "isdnl1.h"
#include "ipacx.h"

#define DBUSY_TIMER_VALUE 80
#define TIMER3_VALUE      7000
#define MAX_DFRAME_LEN_L1 300
#define B_FIFO_SIZE       64
#define D_FIFO_SIZE       32


// ipacx interrupt mask values
#define _MASK_IMASK     0x2E  // global mask
#define _MASKB_IMASK    0x0B
#define _MASKD_IMASK    0x03  // all on

//----------------------------------------------------------
// local function declarations
//----------------------------------------------------------
static void ph_command(struct IsdnCardState *cs, unsigned int command);
static inline void cic_int(struct IsdnCardState *cs);
static void dch_l2l1(struct PStack *st, int pr, void *arg);
static void dbusy_timer_handler(struct timer_list *t);
static void dch_empty_fifo(struct IsdnCardState *cs, int count);
static void dch_fill_fifo(struct IsdnCardState *cs);
static inline void dch_int(struct IsdnCardState *cs);
static void dch_setstack(struct PStack *st, struct IsdnCardState *cs);
static void dch_init(struct IsdnCardState *cs);
static void bch_l2l1(struct PStack *st, int pr, void *arg);
static void bch_empty_fifo(struct BCState *bcs, int count);
static void bch_fill_fifo(struct BCState *bcs);
static void bch_int(struct IsdnCardState *cs, u_char hscx);
static void bch_mode(struct BCState *bcs, int mode, int bc);
static void bch_close_state(struct BCState *bcs);
static int bch_open_state(struct IsdnCardState *cs, struct BCState *bcs);
static int bch_setstack(struct PStack *st, struct BCState *bcs);
static void bch_init(struct IsdnCardState *cs, int hscx);
static void clear_pending_ints(struct IsdnCardState *cs);

//----------------------------------------------------------
// Issue Layer 1 command to chip
//----------------------------------------------------------
static void
ph_command(struct IsdnCardState *cs, unsigned int command)
{
	if (cs->debug & L1_DEB_ISAC)
		debugl1(cs, "ph_command (%#x) in (%#x)", command,
			cs->dc.isac.ph_state);
//###################################
//	printk(KERN_INFO "ph_command (%#x)\n", command);
//###################################
	cs->writeisac(cs, IPACX_CIX0, (command << 4) | 0x0E);
}

//----------------------------------------------------------
// Transceiver interrupt handler
//----------------------------------------------------------
static inline void
cic_int(struct IsdnCardState *cs)
{
	u_char event;

	event = cs->readisac(cs, IPACX_CIR0) >> 4;
	if (cs->debug & L1_DEB_ISAC) debugl1(cs, "cic_int(event=%#x)", event);
//#########################################
//	printk(KERN_INFO "cic_int(%x)\n", event);
//#########################################
	cs->dc.isac.ph_state = event;
	schedule_event(cs, D_L1STATECHANGE);
}

//==========================================================
// D channel functions
//==========================================================

//----------------------------------------------------------
// Command entry point
//----------------------------------------------------------
static void
dch_l2l1(struct PStack *st, int pr, void *arg)
{
	struct IsdnCardState *cs = (struct IsdnCardState *) st->l1.hardware;
	struct sk_buff *skb = arg;
	u_char cda1_cr;

	switch (pr) {
	case (PH_DATA | REQUEST):
		if (cs->debug & DEB_DLOG_HEX) LogFrame(cs, skb->data, skb->len);
		if (cs->debug & DEB_DLOG_VERBOSE) dlogframe(cs, skb, 0);
		if (cs->tx_skb) {
			skb_queue_tail(&cs->sq, skb);
#ifdef L2FRAME_DEBUG
			if (cs->debug & L1_DEB_LAPD) Logl2Frame(cs, skb, "PH_DATA Queued", 0);
#endif
		} else {
			cs->tx_skb = skb;
			cs->tx_cnt = 0;
#ifdef L2FRAME_DEBUG
			if (cs->debug & L1_DEB_LAPD) Logl2Frame(cs, skb, "PH_DATA", 0);
#endif
			dch_fill_fifo(cs);
		}
		break;

	case (PH_PULL | INDICATION):
		if (cs->tx_skb) {
			if (cs->debug & L1_DEB_WARN)
				debugl1(cs, " l2l1 tx_skb exist this shouldn't happen");
			skb_queue_tail(&cs->sq, skb);
			break;
		}
		if (cs->debug & DEB_DLOG_HEX)     LogFrame(cs, skb->data, skb->len);
		if (cs->debug & DEB_DLOG_VERBOSE) dlogframe(cs, skb, 0);
		cs->tx_skb = skb;
		cs->tx_cnt = 0;
#ifdef L2FRAME_DEBUG
		if (cs->debug & L1_DEB_LAPD) Logl2Frame(cs, skb, "PH_DATA_PULLED", 0);
#endif
		dch_fill_fifo(cs);
		break;

	case (PH_PULL | REQUEST):
#ifdef L2FRAME_DEBUG
		if (cs->debug & L1_DEB_LAPD) debugl1(cs, "-> PH_REQUEST_PULL");
#endif
		if (!cs->tx_skb) {
			clear_bit(FLG_L1_PULL_REQ, &st->l1.Flags);
			st->l1.l1l2(st, PH_PULL | CONFIRM, NULL);
		} else
			set_bit(FLG_L1_PULL_REQ, &st->l1.Flags);
		break;

	case (HW_RESET | REQUEST):
	case (HW_ENABLE | REQUEST):
		if ((cs->dc.isac.ph_state == IPACX_IND_RES) ||
		    (cs->dc.isac.ph_state == IPACX_IND_DR) ||
		    (cs->dc.isac.ph_state == IPACX_IND_DC))
			ph_command(cs, IPACX_CMD_TIM);
		else
			ph_command(cs, IPACX_CMD_RES);
		break;

	case (HW_INFO3 | REQUEST):
		ph_command(cs, IPACX_CMD_AR8);
		break;

	case (HW_TESTLOOP | REQUEST):
		cs->writeisac(cs, IPACX_CDA_TSDP10, 0x80); // Timeslot 0 is B1
		cs->writeisac(cs, IPACX_CDA_TSDP11, 0x81); // Timeslot 0 is B1
		cda1_cr = cs->readisac(cs, IPACX_CDA1_CR);
		(void) cs->readisac(cs, IPACX_CDA2_CR);
		if ((long)arg & 1) { // loop B1
			cs->writeisac(cs, IPACX_CDA1_CR, cda1_cr | 0x0a);
		}
		else {  // B1 off
			cs->writeisac(cs, IPACX_CDA1_CR, cda1_cr & ~0x0a);
		}
		if ((long)arg & 2) { // loop B2
			cs->writeisac(cs, IPACX_CDA1_CR, cda1_cr | 0x14);
		}
		else {  // B2 off
			cs->writeisac(cs, IPACX_CDA1_CR, cda1_cr & ~0x14);
		}
		break;

	case (HW_DEACTIVATE | RESPONSE):
		skb_queue_purge(&cs->rq);
		skb_queue_purge(&cs->sq);
		if (cs->tx_skb) {
			dev_kfree_skb_any(cs->tx_skb);
			cs->tx_skb = NULL;
		}
		if (test_and_clear_bit(FLG_DBUSY_TIMER, &cs->HW_Flags))
			del_timer(&cs->dbusytimer);
		break;

	default:
		if (cs->debug & L1_DEB_WARN) debugl1(cs, "dch_l2l1 unknown %04x", pr);
		break;
	}
}

//----------------------------------------------------------
//----------------------------------------------------------
static void
dbusy_timer_handler(struct timer_list *t)
{
	struct IsdnCardState *cs = from_timer(cs, t, dbusytimer);
	struct PStack *st;
	int	rbchd, stard;

	if (test_bit(FLG_DBUSY_TIMER, &cs->HW_Flags)) {
		rbchd = cs->readisac(cs, IPACX_RBCHD);
		stard = cs->readisac(cs, IPACX_STARD);
		if (cs->debug)
			debugl1(cs, "D-Channel Busy RBCHD %02x STARD %02x", rbchd, stard);
		if (!(stard & 0x40)) { // D-Channel Busy
			set_bit(FLG_L1_DBUSY, &cs->HW_Flags);
			for (st = cs->stlist; st; st = st->next) {
				st->l1.l1l2(st, PH_PAUSE | INDICATION, NULL); // flow control on
			}
		} else {
			// seems we lost an interrupt; reset transceiver */
			clear_bit(FLG_DBUSY_TIMER, &cs->HW_Flags);
			if (cs->tx_skb) {
				dev_kfree_skb_any(cs->tx_skb);
				cs->tx_cnt = 0;
				cs->tx_skb = NULL;
			} else {
				printk(KERN_WARNING "HiSax: ISAC D-Channel Busy no skb\n");
				debugl1(cs, "D-Channel Busy no skb");
			}
			cs->writeisac(cs, IPACX_CMDRD, 0x01); // Tx reset, generates XPR
		}
	}
}

//----------------------------------------------------------
// Fill buffer from receive FIFO
//----------------------------------------------------------
static void
dch_empty_fifo(struct IsdnCardState *cs, int count)
{
	u_char *ptr;

	if ((cs->debug & L1_DEB_ISAC) && !(cs->debug & L1_DEB_ISAC_FIFO))
		debugl1(cs, "dch_empty_fifo()");

	// message too large, remove
	if ((cs->rcvidx + count) >= MAX_DFRAME_LEN_L1) {
		if (cs->debug & L1_DEB_WARN)
			debugl1(cs, "dch_empty_fifo() incoming message too large");
		cs->writeisac(cs, IPACX_CMDRD, 0x80); // RMC
		cs->rcvidx = 0;
		return;
	}

	ptr = cs->rcvbuf + cs->rcvidx;
	cs->rcvidx += count;

	cs->readisacfifo(cs, ptr, count);
	cs->writeisac(cs, IPACX_CMDRD, 0x80); // RMC

	if (cs->debug & L1_DEB_ISAC_FIFO) {
		char *t = cs->dlog;

		t += sprintf(t, "dch_empty_fifo() cnt %d", count);
		QuickHex(t, ptr, count);
		debugl1(cs, "%s", cs->dlog);
	}
}

//----------------------------------------------------------
// Fill transmit FIFO
//----------------------------------------------------------
static void
dch_fill_fifo(struct IsdnCardState *cs)
{
	int count;
	u_char cmd, *ptr;

	if ((cs->debug & L1_DEB_ISAC) && !(cs->debug & L1_DEB_ISAC_FIFO))
		debugl1(cs, "dch_fill_fifo()");

	if (!cs->tx_skb) return;
	count = cs->tx_skb->len;
	if (count <= 0) return;

	if (count > D_FIFO_SIZE) {
		count = D_FIFO_SIZE;
		cmd   = 0x08; // XTF
	} else {
		cmd   = 0x0A; // XTF | XME
	}

	ptr = cs->tx_skb->data;
	skb_pull(cs->tx_skb, count);
	cs->tx_cnt += count;
	cs->writeisacfifo(cs, ptr, count);
	cs->writeisac(cs, IPACX_CMDRD, cmd);

	// set timeout for transmission contol
	if (test_and_set_bit(FLG_DBUSY_TIMER, &cs->HW_Flags)) {
		debugl1(cs, "dch_fill_fifo dbusytimer running");
		del_timer(&cs->dbusytimer);
	}
	cs->dbusytimer.expires = jiffies + ((DBUSY_TIMER_VALUE * HZ)/1000);
	add_timer(&cs->dbusytimer);

	if (cs->debug & L1_DEB_ISAC_FIFO) {
		char *t = cs->dlog;

		t += sprintf(t, "dch_fill_fifo() cnt %d", count);
		QuickHex(t, ptr, count);
		debugl1(cs, "%s", cs->dlog);
	}
}

//----------------------------------------------------------
// D channel interrupt handler
//----------------------------------------------------------
static inline void
dch_int(struct IsdnCardState *cs)
{
	struct sk_buff *skb;
	u_char istad, rstad;
	int count;

	istad = cs->readisac(cs, IPACX_ISTAD);
//##############################################
//	printk(KERN_WARNING "dch_int(istad=%02x)\n", istad);
//##############################################

	if (istad & 0x80) {  // RME
		rstad = cs->readisac(cs, IPACX_RSTAD);
		if ((rstad & 0xf0) != 0xa0) { // !(VFR && !RDO && CRC && !RAB)
			if (!(rstad & 0x80))
				if (cs->debug & L1_DEB_WARN)
					debugl1(cs, "dch_int(): invalid frame");
			if ((rstad & 0x40))
				if (cs->debug & L1_DEB_WARN)
					debugl1(cs, "dch_int(): RDO");
			if (!(rstad & 0x20))
				if (cs->debug & L1_DEB_WARN)
					debugl1(cs, "dch_int(): CRC error");
			cs->writeisac(cs, IPACX_CMDRD, 0x80);  // RMC
		} else {  // received frame ok
			count = cs->readisac(cs, IPACX_RBCLD);
			if (count) count--; // RSTAB is last byte
			count &= D_FIFO_SIZE - 1;
			if (count == 0) count = D_FIFO_SIZE;
			dch_empty_fifo(cs, count);
			if ((count = cs->rcvidx) > 0) {
				cs->rcvidx = 0;
				if (!(skb = dev_alloc_skb(count)))
					printk(KERN_WARNING "HiSax dch_int(): receive out of memory\n");
				else {
					skb_put_data(skb, cs->rcvbuf, count);
					skb_queue_tail(&cs->rq, skb);
				}
			}
		}
		cs->rcvidx = 0;
		schedule_event(cs, D_RCVBUFREADY);
	}

	if (istad & 0x40) {  // RPF
		dch_empty_fifo(cs, D_FIFO_SIZE);
	}

	if (istad & 0x20) {  // RFO
		if (cs->debug & L1_DEB_WARN) debugl1(cs, "dch_int(): RFO");
		cs->writeisac(cs, IPACX_CMDRD, 0x40); //RRES
	}

	if (istad & 0x10) {  // XPR
		if (test_and_clear_bit(FLG_DBUSY_TIMER, &cs->HW_Flags))
			del_timer(&cs->dbusytimer);
		if (test_and_clear_bit(FLG_L1_DBUSY, &cs->HW_Flags))
			schedule_event(cs, D_CLEARBUSY);
		if (cs->tx_skb) {
			if (cs->tx_skb->len) {
				dch_fill_fifo(cs);
				goto afterXPR;
			}
			else {
				dev_kfree_skb_irq(cs->tx_skb);
				cs->tx_skb = NULL;
				cs->tx_cnt = 0;
			}
		}
		if ((cs->tx_skb = skb_dequeue(&cs->sq))) {
			cs->tx_cnt = 0;
			dch_fill_fifo(cs);
		}
		else {
			schedule_event(cs, D_XMTBUFREADY);
		}
	}
afterXPR:

	if (istad & 0x0C) {  // XDU or XMR
		if (cs->debug & L1_DEB_WARN) debugl1(cs, "dch_int(): XDU");
		if (cs->tx_skb) {
			skb_push(cs->tx_skb, cs->tx_cnt); // retransmit
			cs->tx_cnt = 0;
			dch_fill_fifo(cs);
		} else {
			printk(KERN_WARNING "HiSax: ISAC XDU no skb\n");
			debugl1(cs, "ISAC XDU no skb");
		}
	}
}

//----------------------------------------------------------
//----------------------------------------------------------
static void
dch_setstack(struct PStack *st, struct IsdnCardState *cs)
{
	st->l1.l1hw = dch_l2l1;
}

//----------------------------------------------------------
//----------------------------------------------------------
static void
dch_init(struct IsdnCardState *cs)
{
	printk(KERN_INFO "HiSax: IPACX ISDN driver v0.1.0\n");

	cs->setstack_d      = dch_setstack;

	timer_setup(&cs->dbusytimer, dbusy_timer_handler, 0);

	cs->writeisac(cs, IPACX_TR_CONF0, 0x00);  // clear LDD
	cs->writeisac(cs, IPACX_TR_CONF2, 0x00);  // enable transmitter
	cs->writeisac(cs, IPACX_MODED,    0xC9);  // transparent mode 0, RAC, stop/go
	cs->writeisac(cs, IPACX_MON_CR,   0x00);  // disable monitor channel
}


//==========================================================
// B channel functions
//==========================================================

//----------------------------------------------------------
// Entry point for commands
//----------------------------------------------------------
static void
bch_l2l1(struct PStack *st, int pr, void *arg)
{
	struct BCState *bcs = st->l1.bcs;
	struct sk_buff *skb = arg;
	u_long flags;

	switch (pr) {
	case (PH_DATA | REQUEST):
		spin_lock_irqsave(&bcs->cs->lock, flags);
		if (bcs->tx_skb) {
			skb_queue_tail(&bcs->squeue, skb);
		} else {
			bcs->tx_skb = skb;
			set_bit(BC_FLG_BUSY, &bcs->Flag);
			bcs->hw.hscx.count = 0;
			bch_fill_fifo(bcs);
		}
		spin_unlock_irqrestore(&bcs->cs->lock, flags);
		break;
	case (PH_PULL | INDICATION):
		spin_lock_irqsave(&bcs->cs->lock, flags);
		if (bcs->tx_skb) {
			printk(KERN_WARNING "HiSax bch_l2l1(): this shouldn't happen\n");
		} else {
			set_bit(BC_FLG_BUSY, &bcs->Flag);
			bcs->tx_skb = skb;
			bcs->hw.hscx.count = 0;
			bch_fill_fifo(bcs);
		}
		spin_unlock_irqrestore(&bcs->cs->lock, flags);
		break;
	case (PH_PULL | REQUEST):
		if (!bcs->tx_skb) {
			clear_bit(FLG_L1_PULL_REQ, &st->l1.Flags);
			st->l1.l1l2(st, PH_PULL | CONFIRM, NULL);
		} else
			set_bit(FLG_L1_PULL_REQ, &st->l1.Flags);
		break;
	case (PH_ACTIVATE | REQUEST):
		spin_lock_irqsave(&bcs->cs->lock, flags);
		set_bit(BC_FLG_ACTIV, &bcs->Flag);
		bch_mode(bcs, st->l1.mode, st->l1.bc);
		spin_unlock_irqrestore(&bcs->cs->lock, flags);
		l1_msg_b(st, pr, arg);
		break;
	case (PH_DEACTIVATE | REQUEST):
		l1_msg_b(st, pr, arg);
		break;
	case (PH_DEACTIVATE | CONFIRM):
		spin_lock_irqsave(&bcs->cs->lock, flags);
		clear_bit(BC_FLG_ACTIV, &bcs->Flag);
		clear_bit(BC_FLG_BUSY, &bcs->Flag);
		bch_mode(bcs, 0, st->l1.bc);
		spin_unlock_irqrestore(&bcs->cs->lock, flags);
		st->l1.l1l2(st, PH_DEACTIVATE | CONFIRM, NULL);
		break;
	}
}

//----------------------------------------------------------
// Read B channel fifo to receive buffer
//----------------------------------------------------------
static void
bch_empty_fifo(struct BCState *bcs, int count)
{
	u_char *ptr, hscx;
	struct IsdnCardState *cs;
	int cnt;

	cs = bcs->cs;
	hscx = bcs->hw.hscx.hscx;
	if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
		debugl1(cs, "bch_empty_fifo()");

	// message too large, remove
	if (bcs->hw.hscx.rcvidx + count > HSCX_BUFMAX) {
		if (cs->debug & L1_DEB_WARN)
			debugl1(cs, "bch_empty_fifo() incoming packet too large");
		cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x80);  // RMC
		bcs->hw.hscx.rcvidx = 0;
		return;
	}

	ptr = bcs->hw.hscx.rcvbuf + bcs->hw.hscx.rcvidx;
	cnt = count;
	while (cnt--) *ptr++ = cs->BC_Read_Reg(cs, hscx, IPACX_RFIFOB);
	cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x80);  // RMC

	ptr = bcs->hw.hscx.rcvbuf + bcs->hw.hscx.rcvidx;
	bcs->hw.hscx.rcvidx += count;

	if (cs->debug & L1_DEB_HSCX_FIFO) {
		char *t = bcs->blog;

		t += sprintf(t, "bch_empty_fifo() B-%d cnt %d", hscx, count);
		QuickHex(t, ptr, count);
		debugl1(cs, "%s", bcs->blog);
	}
}

//----------------------------------------------------------
// Fill buffer to transmit FIFO
//----------------------------------------------------------
static void
bch_fill_fifo(struct BCState *bcs)
{
	struct IsdnCardState *cs;
	int more, count, cnt;
	u_char *ptr, *p, hscx;

	cs = bcs->cs;
	if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
		debugl1(cs, "bch_fill_fifo()");

	if (!bcs->tx_skb)           return;
	if (bcs->tx_skb->len <= 0)  return;

	hscx = bcs->hw.hscx.hscx;
	more = (bcs->mode == L1_MODE_TRANS) ? 1 : 0;
	if (bcs->tx_skb->len > B_FIFO_SIZE) {
		more  = 1;
		count = B_FIFO_SIZE;
	} else {
		count = bcs->tx_skb->len;
	}
	cnt = count;

	p = ptr = bcs->tx_skb->data;
	skb_pull(bcs->tx_skb, count);
	bcs->tx_cnt -= count;
	bcs->hw.hscx.count += count;
	while (cnt--) cs->BC_Write_Reg(cs, hscx, IPACX_XFIFOB, *p++);
	cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, (more ? 0x08 : 0x0a));

	if (cs->debug & L1_DEB_HSCX_FIFO) {
		char *t = bcs->blog;

		t += sprintf(t, "%s() B-%d cnt %d", __func__, hscx, count);
		QuickHex(t, ptr, count);
		debugl1(cs, "%s", bcs->blog);
	}
}

//----------------------------------------------------------
// B channel interrupt handler
//----------------------------------------------------------
static void
bch_int(struct IsdnCardState *cs, u_char hscx)
{
	u_char istab;
	struct BCState *bcs;
	struct sk_buff *skb;
	int count;
	u_char rstab;

	bcs = cs->bcs + hscx;
	istab = cs->BC_Read_Reg(cs, hscx, IPACX_ISTAB);
//##############################################
//	printk(KERN_WARNING "bch_int(istab=%02x)\n", istab);
//##############################################
	if (!test_bit(BC_FLG_INIT, &bcs->Flag)) return;

	if (istab & 0x80) {	// RME
		rstab = cs->BC_Read_Reg(cs, hscx, IPACX_RSTAB);
		if ((rstab & 0xf0) != 0xa0) { // !(VFR && !RDO && CRC && !RAB)
			if (!(rstab & 0x80))
				if (cs->debug & L1_DEB_WARN)
					debugl1(cs, "bch_int() B-%d: invalid frame", hscx);
			if ((rstab & 0x40) && (bcs->mode != L1_MODE_NULL))
				if (cs->debug & L1_DEB_WARN)
					debugl1(cs, "bch_int() B-%d: RDO mode=%d", hscx, bcs->mode);
			if (!(rstab & 0x20))
				if (cs->debug & L1_DEB_WARN)
					debugl1(cs, "bch_int() B-%d: CRC error", hscx);
			cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x80);  // RMC
		}
		else {  // received frame ok
			count = cs->BC_Read_Reg(cs, hscx, IPACX_RBCLB) & (B_FIFO_SIZE - 1);
			if (count == 0) count = B_FIFO_SIZE;
			bch_empty_fifo(bcs, count);
			if ((count = bcs->hw.hscx.rcvidx - 1) > 0) {
				if (cs->debug & L1_DEB_HSCX_FIFO)
					debugl1(cs, "bch_int Frame %d", count);
				if (!(skb = dev_alloc_skb(count)))
					printk(KERN_WARNING "HiSax bch_int(): receive frame out of memory\n");
				else {
					skb_put_data(skb, bcs->hw.hscx.rcvbuf,
						     count);
					skb_queue_tail(&bcs->rqueue, skb);
				}
			}
		}
		bcs->hw.hscx.rcvidx = 0;
		schedule_event(bcs, B_RCVBUFREADY);
	}

	if (istab & 0x40) {	// RPF
		bch_empty_fifo(bcs, B_FIFO_SIZE);

		if (bcs->mode == L1_MODE_TRANS) { // queue every chunk
			// receive transparent audio data
			if (!(skb = dev_alloc_skb(B_FIFO_SIZE)))
				printk(KERN_WARNING "HiSax bch_int(): receive transparent out of memory\n");
			else {
				skb_put_data(skb, bcs->hw.hscx.rcvbuf,
					     B_FIFO_SIZE);
				skb_queue_tail(&bcs->rqueue, skb);
			}
			bcs->hw.hscx.rcvidx = 0;
			schedule_event(bcs, B_RCVBUFREADY);
		}
	}

	if (istab & 0x20) {	// RFO
		if (cs->debug & L1_DEB_WARN)
			debugl1(cs, "bch_int() B-%d: RFO error", hscx);
		cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x40);  // RRES
	}

	if (istab & 0x10) {	// XPR
		if (bcs->tx_skb) {
			if (bcs->tx_skb->len) {
				bch_fill_fifo(bcs);
				goto afterXPR;
			} else {
				if (test_bit(FLG_LLI_L1WAKEUP, &bcs->st->lli.flag) &&
				    (PACKET_NOACK != bcs->tx_skb->pkt_type)) {
					u_long	flags;
					spin_lock_irqsave(&bcs->aclock, flags);
					bcs->ackcnt += bcs->hw.hscx.count;
					spin_unlock_irqrestore(&bcs->aclock, flags);
					schedule_event(bcs, B_ACKPENDING);
				}
			}
			dev_kfree_skb_irq(bcs->tx_skb);
			bcs->hw.hscx.count = 0;
			bcs->tx_skb = NULL;
		}
		if ((bcs->tx_skb = skb_dequeue(&bcs->squeue))) {
			bcs->hw.hscx.count = 0;
			set_bit(BC_FLG_BUSY, &bcs->Flag);
			bch_fill_fifo(bcs);
		} else {
			clear_bit(BC_FLG_BUSY, &bcs->Flag);
			schedule_event(bcs, B_XMTBUFREADY);
		}
	}
afterXPR:

	if (istab & 0x04) {	// XDU
		if (bcs->mode == L1_MODE_TRANS) {
			bch_fill_fifo(bcs);
		}
		else {
			if (bcs->tx_skb) {  // restart transmitting the whole frame
				skb_push(bcs->tx_skb, bcs->hw.hscx.count);
				bcs->tx_cnt += bcs->hw.hscx.count;
				bcs->hw.hscx.count = 0;
			}
			cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x01);  // XRES
			if (cs->debug & L1_DEB_WARN)
				debugl1(cs, "bch_int() B-%d XDU error", hscx);
		}
	}
}

//----------------------------------------------------------
//----------------------------------------------------------
static void
bch_mode(struct BCState *bcs, int mode, int bc)
{
	struct IsdnCardState *cs = bcs->cs;
	int hscx = bcs->hw.hscx.hscx;

	bc = bc ? 1 : 0;  // in case bc is greater than 1
	if (cs->debug & L1_DEB_HSCX)
		debugl1(cs, "mode_bch() switch B-%d mode %d chan %d", hscx, mode, bc);
	bcs->mode = mode;
	bcs->channel = bc;

	// map controller to according timeslot
	if (!hscx)
	{
		cs->writeisac(cs, IPACX_BCHA_TSDP_BC1, 0x80 | bc);
		cs->writeisac(cs, IPACX_BCHA_CR,       0x88);
	}
	else
	{
		cs->writeisac(cs, IPACX_BCHB_TSDP_BC1, 0x80 | bc);
		cs->writeisac(cs, IPACX_BCHB_CR,       0x88);
	}

	switch (mode) {
	case (L1_MODE_NULL):
		cs->BC_Write_Reg(cs, hscx, IPACX_MODEB, 0xC0);  // rec off
		cs->BC_Write_Reg(cs, hscx, IPACX_EXMB,  0x30);  // std adj.
		cs->BC_Write_Reg(cs, hscx, IPACX_MASKB, 0xFF);  // ints off
		cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x41);  // validate adjustments
		break;
	case (L1_MODE_TRANS):
		cs->BC_Write_Reg(cs, hscx, IPACX_MODEB, 0x88);  // ext transp mode
		cs->BC_Write_Reg(cs, hscx, IPACX_EXMB,  0x00);  // xxx00000
		cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x41);  // validate adjustments
		cs->BC_Write_Reg(cs, hscx, IPACX_MASKB, _MASKB_IMASK);
		break;
	case (L1_MODE_HDLC):
		cs->BC_Write_Reg(cs, hscx, IPACX_MODEB, 0xC8);  // transp mode 0
		cs->BC_Write_Reg(cs, hscx, IPACX_EXMB,  0x01);  // idle=hdlc flags crc enabled
		cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x41);  // validate adjustments
		cs->BC_Write_Reg(cs, hscx, IPACX_MASKB, _MASKB_IMASK);
		break;
	}
}

//----------------------------------------------------------
//----------------------------------------------------------
static void
bch_close_state(struct BCState *bcs)
{
	bch_mode(bcs, 0, bcs->channel);
	if (test_and_clear_bit(BC_FLG_INIT, &bcs->Flag)) {
		kfree(bcs->hw.hscx.rcvbuf);
		bcs->hw.hscx.rcvbuf = NULL;
		kfree(bcs->blog);
		bcs->blog = NULL;
		skb_queue_purge(&bcs->rqueue);
		skb_queue_purge(&bcs->squeue);
		if (bcs->tx_skb) {
			dev_kfree_skb_any(bcs->tx_skb);
			bcs->tx_skb = NULL;
			clear_bit(BC_FLG_BUSY, &bcs->Flag);
		}
	}
}

//----------------------------------------------------------
//----------------------------------------------------------
static int
bch_open_state(struct IsdnCardState *cs, struct BCState *bcs)
{
	if (!test_and_set_bit(BC_FLG_INIT, &bcs->Flag)) {
		if (!(bcs->hw.hscx.rcvbuf = kmalloc(HSCX_BUFMAX, GFP_ATOMIC))) {
			printk(KERN_WARNING
			       "HiSax open_bchstate(): No memory for hscx.rcvbuf\n");
			clear_bit(BC_FLG_INIT, &bcs->Flag);
			return (1);
		}
		if (!(bcs->blog = kmalloc(MAX_BLOG_SPACE, GFP_ATOMIC))) {
			printk(KERN_WARNING
			       "HiSax open_bchstate: No memory for bcs->blog\n");
			clear_bit(BC_FLG_INIT, &bcs->Flag);
			kfree(bcs->hw.hscx.rcvbuf);
			bcs->hw.hscx.rcvbuf = NULL;
			return (2);
		}
		skb_queue_head_init(&bcs->rqueue);
		skb_queue_head_init(&bcs->squeue);
	}
	bcs->tx_skb = NULL;
	clear_bit(BC_FLG_BUSY, &bcs->Flag);
	bcs->event = 0;
	bcs->hw.hscx.rcvidx = 0;
	bcs->tx_cnt = 0;
	return (0);
}

//----------------------------------------------------------
//----------------------------------------------------------
static int
bch_setstack(struct PStack *st, struct BCState *bcs)
{
	bcs->channel = st->l1.bc;
	if (bch_open_state(st->l1.hardware, bcs)) return (-1);
	st->l1.bcs = bcs;
	st->l2.l2l1 = bch_l2l1;
	setstack_manager(st);
	bcs->st = st;
	setstack_l1_B(st);
	return (0);
}

//----------------------------------------------------------
//----------------------------------------------------------
static void
bch_init(struct IsdnCardState *cs, int hscx)
{
	cs->bcs[hscx].BC_SetStack   = bch_setstack;
	cs->bcs[hscx].BC_Close      = bch_close_state;
	cs->bcs[hscx].hw.hscx.hscx  = hscx;
	cs->bcs[hscx].cs            = cs;
	bch_mode(cs->bcs + hscx, 0, hscx);
}


//==========================================================
// Shared functions
//==========================================================

//----------------------------------------------------------
// Main interrupt handler
//----------------------------------------------------------
void
interrupt_ipacx(struct IsdnCardState *cs)
{
	u_char ista;

	while ((ista = cs->readisac(cs, IPACX_ISTA))) {
//#################################################
//		printk(KERN_WARNING "interrupt_ipacx(ista=%02x)\n", ista);
//#################################################
		if (ista & 0x80) bch_int(cs, 0); // B channel interrupts
		if (ista & 0x40) bch_int(cs, 1);

		if (ista & 0x01) dch_int(cs);    // D channel
		if (ista & 0x10) cic_int(cs);    // Layer 1 state
	}
}

//----------------------------------------------------------
// Clears chip interrupt status
//----------------------------------------------------------
static void
clear_pending_ints(struct IsdnCardState *cs)
{
	int ista;

	// all interrupts off
	cs->writeisac(cs, IPACX_MASK, 0xff);
	cs->writeisac(cs, IPACX_MASKD, 0xff);
	cs->BC_Write_Reg(cs, 0, IPACX_MASKB, 0xff);
	cs->BC_Write_Reg(cs, 1, IPACX_MASKB, 0xff);

	ista = cs->readisac(cs, IPACX_ISTA);
	if (ista & 0x80) cs->BC_Read_Reg(cs, 0, IPACX_ISTAB);
	if (ista & 0x40) cs->BC_Read_Reg(cs, 1, IPACX_ISTAB);
	if (ista & 0x10) cs->readisac(cs, IPACX_CIR0);
	if (ista & 0x01) cs->readisac(cs, IPACX_ISTAD);
}

//----------------------------------------------------------
// Does chip configuration work
// Work to do depends on bit mask in part
//----------------------------------------------------------
void
init_ipacx(struct IsdnCardState *cs, int part)
{
	if (part & 1) {  // initialise chip
//##################################################
//	printk(KERN_INFO "init_ipacx(%x)\n", part);
//##################################################
		clear_pending_ints(cs);
		bch_init(cs, 0);
		bch_init(cs, 1);
		dch_init(cs);
	}
	if (part & 2) {  // reenable all interrupts and start chip
		cs->BC_Write_Reg(cs, 0, IPACX_MASKB, _MASKB_IMASK);
		cs->BC_Write_Reg(cs, 1, IPACX_MASKB, _MASKB_IMASK);
		cs->writeisac(cs, IPACX_MASKD, _MASKD_IMASK);
		cs->writeisac(cs, IPACX_MASK, _MASK_IMASK); // global mask register

		// reset HDLC Transmitters/receivers
		cs->writeisac(cs, IPACX_CMDRD, 0x41);
		cs->BC_Write_Reg(cs, 0, IPACX_CMDRB, 0x41);
		cs->BC_Write_Reg(cs, 1, IPACX_CMDRB, 0x41);
		ph_command(cs, IPACX_CMD_RES);
	}
}

//----------------- end of file -----------------------