summaryrefslogtreecommitdiffstats
path: root/extra/dahdi-linux-grsec/zaphfc-dahdi-flortz.diff
blob: 719accdc6902be5161a3e4feb1494762c7f39b58 (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
Index: dahdi-linux-2.1.0.4/drivers/dahdi/zaphfc.h
===================================================================
--- dahdi-linux-2.1.0.4.orig/drivers/dahdi/zaphfc.h	2009-03-17 18:13:54.000000000 +0200
+++ dahdi-linux-2.1.0.4/drivers/dahdi/zaphfc.h	2009-03-17 18:14:44.000000000 +0200
@@ -135,8 +135,12 @@
 /* bits in HFCD_MST_MODE */
 #define hfc_MST_MODE_MASTER	     0x01
 #define hfc_MST_MODE_SLAVE         0x00
+#define hfc_MST_MODE_F0_LONG_DURATION         0x08
 /* remaining bits are for codecs control */
 
+/* bits in HFCD_MST_EMOD */
+#define hfc_MST_EMOD_SLOW_CLOCK_ADJ	0x01
+
 /* bits in HFCD_SCTRL */
 #define hfc_SCTRL_B1_ENA	     0x01
 #define hfc_SCTRL_B2_ENA	     0x02
@@ -236,6 +240,9 @@
 #define hfc_BTRANS_THRESHOLD 128
 #define hfc_BTRANS_THRESMASK 0x00
 
+#define hfc_FIFO_MEM_SIZE_BYTES (32*1024)
+#define hfc_FIFO_MEM_SIZE_PAGES ((hfc_FIFO_MEM_SIZE_BYTES+PAGE_SIZE-1)/PAGE_SIZE)
+
 /* Structures */
 
 typedef struct hfc_regs {
@@ -249,20 +256,67 @@
     unsigned char connect;
     unsigned char trm;
     unsigned char mst_mode;
+    unsigned char mst_emod;
     unsigned char bswapped;
     unsigned char nt_mode;
     unsigned char int_drec;
 } hfc_regs;
 
+struct bch {
+    int fill_fifo,checkcnt,initialized;
+    struct {
+	u16 z2;
+	struct {
+	    volatile u16 *z1p;
+	    volatile u8 *fifo_base;
+	    int filled;
+	} c[2];
+	int diff;
+    } rx;
+    struct {
+	u16 z1;
+	struct {
+	    volatile u16 *z1p,*z2p;
+	    volatile u8 *fifo_base;
+	    int filled;
+	} c[2];
+	int diff;
+    } tx;
+};
+
+struct dch {
+    struct {
+	struct {
+	    volatile u8 *p;
+	} f1;
+	struct {
+	    u8 v;
+	    struct {
+		u16 v;
+	    } z2;
+	} f2;
+    } rx;
+    struct {
+	struct {
+	    u8 v;
+	    volatile u8 *p;
+	    struct {
+		u16 v;
+	    } z1;
+	} f1;
+	struct {
+	    volatile u8 *p;
+	} f2;
+    } tx;
+};
+
 typedef struct hfc_card {
     spinlock_t lock;
     unsigned int irq;
     unsigned int iomem;
     int ticks;		
-    int clicks;		
     unsigned char *pci_io;
-    void *fifomem;		// start of the shared mem
-    volatile void *fifos;	// 32k aligned mem for the fifos
+    void *fifos;		// 32k aligned mem for the fifos
     struct hfc_regs regs;
     unsigned int pcibus;
     unsigned int pcidevfn;
@@ -274,6 +328,9 @@
     unsigned char brecbuf[2][DAHDI_CHUNKSIZE];
     unsigned char btransbuf[2][DAHDI_CHUNKSIZE];
     unsigned char cardno;
+    int active;
+    struct bch bch;
+    struct dch dch;
     struct hfc_card *next;
 } hfc_card;
 
@@ -285,6 +342,3 @@
     struct hfc_card *card;
 } dahdi_hfc;
 
-/* tune this */
-#define hfc_BCHAN_BUFFER	8
-#define hfc_MAX_CARDS		8
Index: dahdi-linux-2.1.0.4/drivers/dahdi/zaphfc.c
===================================================================
--- dahdi-linux-2.1.0.4.orig/drivers/dahdi/zaphfc.c	2009-03-17 18:52:47.000000000 +0200
+++ dahdi-linux-2.1.0.4/drivers/dahdi/zaphfc.c	2009-03-17 18:53:43.000000000 +0200
@@ -7,19 +7,21 @@
  *
  * Klaus-Peter Junghanns <kpj@junghanns.net>
  *
+ * Copyright (C) 2004, 2005, 2006  Florian Zumbiehl <florz@gmx.de>
+ *  - support for slave mode of the HFC-S chip which allows it to
+ *    sync its sample clock to an external source/another HFC chip
+ *  - support for "interrupt bundling" (let only one card generate
+ *    8 kHz timing interrupt no matter how many cards there are
+ *    in the system)
+ *  - interrupt loss tolerant b channel handling
+ *
  * This program is free software and may be modified and
- * distributed under the terms of the GNU Public License.
+ * distributed under the terms of the GNU General Public License.
  *
  */
 
 #include <linux/kernel.h>
 #include <linux/module.h>
-#ifdef RTAITIMING
-#include <asm/io.h>
-#include <rtai.h>
-#include <rtai_sched.h>
-#include <rtai_fifos.h>
-#endif
 #include <linux/pci.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
@@ -29,6 +31,8 @@
 
 #include <linux/moduleparam.h>
 
+#define log2(n) ffz(~(n))
+
 #if CONFIG_PCI
 
 #define CLKDEL_TE	0x0f	/* CLKDEL in TE mode */
@@ -70,42 +74,31 @@
 static struct hfc_card *hfc_dev_list = NULL;
 static int hfc_dev_count = 0;
 static int modes = 0; // all TE
+static int sync_slave = 0; // all master
+static int timer_card = 0;
+static int jitterbuffer = 1;
 static int debug = 0;
 static struct pci_dev *multi_hfc = NULL;
 static spinlock_t registerlock = SPIN_LOCK_UNLOCKED;
 
-void hfc_shutdownCard(struct hfc_card *hfctmp) {
-    unsigned long flags;
-
-    if (hfctmp == NULL) {
-	return;
-    }
-
-    if (hfctmp->pci_io == NULL) {
-	return;
-    }
-    
-    spin_lock_irqsave(&hfctmp->lock,flags);
-
+void hfc_shutdownCard1(struct hfc_card *hfctmp) {
     printk(KERN_INFO "zaphfc: shutting down card at %p.\n",hfctmp->pci_io);
 
     /* Clear interrupt mask */
     hfctmp->regs.int_m2 = 0;
     hfc_outb(hfctmp, hfc_INT_M2, hfctmp->regs.int_m2);
 
-    /* Reset pending interrupts */
-    hfc_inb(hfctmp, hfc_INT_S1);
+    /* Remove interrupt handler */
+    free_irq(hfctmp->irq,hfctmp);
+}
+
+void hfc_shutdownCard2(struct hfc_card *hfctmp) {
+    unsigned long flags;
 
-    /* Wait for interrupts that might still be pending */
-    spin_unlock_irqrestore(&hfctmp->lock, flags);
-    set_current_state(TASK_UNINTERRUPTIBLE);
-    schedule_timeout((30 * HZ) / 1000);	// wait 30 ms
     spin_lock_irqsave(&hfctmp->lock,flags);
 
-    /* Remove interrupt handler */
-    if (hfctmp->irq) {
-	free_irq(hfctmp->irq, hfctmp);
-    }
+    /* Reset pending interrupts */
+    hfc_inb(hfctmp, hfc_INT_S1);
 
     /* Soft-reset the card */
     hfc_outb(hfctmp, hfc_CIRM, hfc_CIRM_RESET); // softreset on
@@ -119,8 +112,8 @@
 
     pci_write_config_word(hfctmp->pcidev, PCI_COMMAND, 0);	// disable memio and bustmaster
 
-    if (hfctmp->fifomem != NULL) {
-        kfree(hfctmp->fifomem);
+    if (hfctmp->fifos != NULL) {
+	free_pages((unsigned long)hfctmp->fifos,log2(hfc_FIFO_MEM_SIZE_PAGES));
     }
     iounmap((void *) hfctmp->pci_io);
     hfctmp->pci_io = NULL;
@@ -130,11 +123,24 @@
     spin_unlock_irqrestore(&hfctmp->lock,flags);
     if (hfctmp->ztdev != NULL) {
 	dahdi_unregister(&hfctmp->ztdev->span);
-	kfree(hfctmp->ztdev);
+	vfree(hfctmp->ztdev);
 	printk(KERN_INFO "unregistered from DAHDI.\n");
     }
 }
 
+void hfc_shutdownCard(struct hfc_card *hfctmp) {
+    if (hfctmp == NULL) {
+	return;
+    }
+
+    if (hfctmp->pci_io == NULL) {
+	return;
+    }
+
+    hfc_shutdownCard1(hfctmp);
+    hfc_shutdownCard2(hfctmp);
+}
+
 void hfc_resetCard(struct hfc_card *hfctmp) {
     unsigned long flags;
 
@@ -178,14 +184,14 @@
     hfctmp->regs.ctmt = hfc_CTMT_TRANSB1 | hfc_CTMT_TRANSB2; // all bchans are transparent , no freaking hdlc
     hfc_outb(hfctmp, hfc_CTMT, hfctmp->regs.ctmt);
 
-    hfctmp->regs.int_m1 = 0;
+    hfctmp->regs.int_m1=hfc_INTS_L1STATE;
+    if(hfctmp->cardno==timer_card){
+	hfctmp->regs.int_m2=hfc_M2_PROC_TRANS;
+    }else{
+	hfctmp->regs.int_m1|=hfc_INTS_DREC;
+	hfctmp->regs.int_m2=0;
+    }
     hfc_outb(hfctmp, hfc_INT_M1, hfctmp->regs.int_m1);
-
-#ifdef RTAITIMING
-    hfctmp->regs.int_m2 = 0;
-#else
-    hfctmp->regs.int_m2 = hfc_M2_PROC_TRANS;
-#endif
     hfc_outb(hfctmp, hfc_INT_M2, hfctmp->regs.int_m2);
 
     /* Clear already pending ints */
@@ -197,8 +203,8 @@
 	hfctmp->regs.sctrl = 3 | hfc_SCTRL_NONE_CAP | hfc_SCTRL_MODE_TE;	/* set tx_lo mode, error in datasheet ! */
     }
 
-    hfctmp->regs.mst_mode = hfc_MST_MODE_MASTER;	/* HFC Master Mode */
     hfc_outb(hfctmp, hfc_MST_MODE, hfctmp->regs.mst_mode);
+    hfc_outb(hfctmp, hfc_MST_EMOD, hfctmp->regs.mst_emod);
 
     hfc_outb(hfctmp, hfc_SCTRL, hfctmp->regs.sctrl);
     hfctmp->regs.sctrl_r = 3;
@@ -210,10 +216,8 @@
     hfc_outb(hfctmp, hfc_CIRM, 0x80 | 0x40);	// bit order
 
     /* Finally enable IRQ output */
-#ifndef RTAITIMING
     hfctmp->regs.int_m2 |= hfc_M2_IRQ_ENABLE;
     hfc_outb(hfctmp, hfc_INT_M2, hfctmp->regs.int_m2);
-#endif
 
     /* clear pending ints */
     hfc_inb(hfctmp, hfc_INT_S1); 
@@ -230,368 +234,210 @@
     spin_unlock(&registerlock);
 }
 
-static void hfc_btrans(struct hfc_card *hfctmp, char whichB) {
-    // we are called with irqs disabled from the irq handler
-    int count, maxlen, total;
-    unsigned char *f1, *f2;
-    unsigned short *z1, *z2, newz1;
-    int freebytes;
-
-    if (whichB == 1) {
-	f1 = (char *)(hfctmp->fifos + hfc_FIFO_B1TX_F1);
-        f2 = (char *)(hfctmp->fifos + hfc_FIFO_B1TX_F2);
-	z1 = (unsigned short *)(hfctmp->fifos + hfc_FIFO_B1TX_Z1 + (*f1 * 4));
-	z2 = (unsigned short *)(hfctmp->fifos + hfc_FIFO_B1TX_Z2 + (*f1 * 4));
-    } else {
-	f1 = (char *)(hfctmp->fifos + hfc_FIFO_B2TX_F1);
-        f2 = (char *)(hfctmp->fifos + hfc_FIFO_B2TX_F2);
-	z1 = (unsigned short *)(hfctmp->fifos + hfc_FIFO_B2TX_Z1 + (*f1 * 4));
-	z2 = (unsigned short *)(hfctmp->fifos + hfc_FIFO_B2TX_Z2 + (*f1 * 4));
-    }
-
-    freebytes = *z2 - *z1;
-    if (freebytes <= 0) {
-	freebytes += hfc_B_FIFO_SIZE;
-    }
-    count = DAHDI_CHUNKSIZE;
-
-    total = count;
-    if (freebytes < count) {
-	hfctmp->clicks++;
-	/* only spit out this warning once per second to not make things worse! */
-	if (hfctmp->clicks > 100) {
-	    printk(KERN_CRIT "zaphfc: bchan tx fifo full, dropping audio! (z1=%d, z2=%d)\n",*z1,*z2);
-	    hfctmp->clicks = 0;
-	}
-	return;
-    }
-    
-    maxlen = (hfc_B_FIFO_SIZE + hfc_B_SUB_VAL) - *z1;
-    if (maxlen > count) {
-        maxlen = count;
-    }
-    newz1 = *z1 + total;
-    if (newz1 >= (hfc_B_FIFO_SIZE + hfc_B_SUB_VAL)) { newz1 -= hfc_B_FIFO_SIZE; }
+/*===========================================================================*/
 
-	if (whichB == 1) {
-	    memcpy((char *)(hfctmp->fifos + hfc_FIFO_B1TX_ZOFF + *z1),hfctmp->ztdev->chans[0].writechunk, maxlen);
-	} else {
-	    memcpy((char *)(hfctmp->fifos + hfc_FIFO_B2TX_ZOFF + *z1),hfctmp->ztdev->chans[1].writechunk, maxlen);
-	}
-	
-	count -= maxlen;
-	if (count > 0) {
-	// Buffer wrap
-	    if (whichB == 1) {
-	        memcpy((char *)(hfctmp->fifos + hfc_FIFO_B1TX_ZOFF + hfc_B_SUB_VAL),hfctmp->ztdev->chans[0].writechunk+maxlen, count);
-	    } else {
-	        memcpy((char *)(hfctmp->fifos + hfc_FIFO_B2TX_ZOFF + hfc_B_SUB_VAL),hfctmp->ztdev->chans[1].writechunk+maxlen, count);
-	    }
-	}
+#if hfc_B_FIFO_SIZE%DAHDI_CHUNKSIZE
+#error hfc_B_FIFO_SIZE is not a multiple of DAHDI_CHUNKSIZE even though the code assumes this
+#endif
+
+static void hfc_dch_init(struct hfc_card *hfctmp){
+    struct dch *chtmp=&hfctmp->dch;
 
-    *z1 = newz1;	/* send it now */
+    chtmp->rx.f1.p=(u8 *)(hfctmp->fifos+hfc_FIFO_DRX_F1);
+    chtmp->rx.f2.v=0x1f;
+    chtmp->rx.f2.z2.v=0x1ff;
 
-//    if (count > 0) printk(KERN_CRIT "zaphfc: bchan tx fifo (f1=%d, f2=%d, z1=%d, z2=%d)\n",(*f1) & hfc_FMASK,(*f2) & hfc_FMASK, *z1, *z2);
-    return;    
+    chtmp->tx.f1.p=(u8 *)(hfctmp->fifos+hfc_FIFO_DTX_F1);
+    chtmp->tx.f1.v=0x1f;
+    chtmp->tx.f1.z1.v=0x1ff;
+    chtmp->tx.f2.p=(u8 *)(hfctmp->fifos+hfc_FIFO_DTX_F2);
 }
 
-static void hfc_brec(struct hfc_card *hfctmp, char whichB) {
-    // we are called with irqs disabled from the irq handler
-    int count, maxlen, drop;
-    volatile unsigned char *f1, *f2;
-    volatile unsigned short *z1, *z2, newz2;
-    int bytes = 0;
-
-    if (whichB == 1) {
-	f1 = (char *)(hfctmp->fifos + hfc_FIFO_B1RX_F1);
-        f2 = (char *)(hfctmp->fifos + hfc_FIFO_B1RX_F2);
-	z1 = (unsigned short *)(hfctmp->fifos + hfc_FIFO_B1RX_Z1 + (*f1 * 4));
-	z2 = (unsigned short *)(hfctmp->fifos + hfc_FIFO_B1RX_Z2 + (*f1 * 4));
-    } else {
-	f1 = (char *)(hfctmp->fifos + hfc_FIFO_B2RX_F1);
-        f2 = (char *)(hfctmp->fifos + hfc_FIFO_B2RX_F2);
-	z1 = (unsigned short *)(hfctmp->fifos + hfc_FIFO_B2RX_Z1 + (*f1 * 4));
-	z2 = (unsigned short *)(hfctmp->fifos + hfc_FIFO_B2RX_Z2 + (*f1 * 4));
-    }
+static void hfc_bch_init(struct hfc_card *hfctmp){
+    struct bch *chtmp=&hfctmp->bch;
 
-    bytes = *z1 - *z2;
-    if (bytes < 0) {
-	bytes += hfc_B_FIFO_SIZE;
-    }
-    count = DAHDI_CHUNKSIZE;
-    
-    if (bytes < DAHDI_CHUNKSIZE) {
-#ifndef RTAITIMING
-	printk(KERN_CRIT "zaphfc: bchan rx fifo not enough bytes to receive! (z1=%d, z2=%d, wanted %d got %d), probably a buffer overrun.\n",*z1,*z2,DAHDI_CHUNKSIZE,bytes);
-#endif
-	return;
-    }
+    chtmp->checkcnt=0;
+    chtmp->fill_fifo=0;
 
-    /* allowing the buffering of hfc_BCHAN_BUFFER bytes of audio data works around irq jitter */
-    if (bytes > hfc_BCHAN_BUFFER + DAHDI_CHUNKSIZE) {
-	/* if the system is too slow to handle it, we will have to drop it all (except 1 DAHDI chunk) */
-	drop = bytes - DAHDI_CHUNKSIZE;
-	hfctmp->clicks++;
-	/* only spit out this warning once per second to not make things worse! */
-	if (hfctmp->clicks > 100) {
-	    printk(KERN_CRIT "zaphfc: dropped audio (z1=%d, z2=%d, wanted %d got %d, dropped %d).\n",*z1,*z2,count,bytes,drop);
-	    hfctmp->clicks = 0;
-	}
-	/* hm, we are processing the b chan data tooooo slowly... let's drop the lost audio */
-	newz2 = *z2 + drop;
-	if (newz2 >= (hfc_B_FIFO_SIZE + hfc_B_SUB_VAL)) { 
-	    newz2 -= hfc_B_FIFO_SIZE; 
-	}
-	*z2 = newz2;
-    }
+    chtmp->rx.c[0].z1p=(unsigned short *)(hfctmp->fifos+hfc_FIFO_B1RX_Z1+0x1f*4);
+    chtmp->rx.c[0].fifo_base=(char *)(hfctmp->fifos+hfc_FIFO_B1RX_ZOFF);
+    chtmp->rx.c[1].z1p=(unsigned short *)(hfctmp->fifos+hfc_FIFO_B2RX_Z1+0x1f*4);
+    chtmp->rx.c[1].fifo_base=(char *)(hfctmp->fifos+hfc_FIFO_B2RX_ZOFF);
+    chtmp->rx.z2=hfc_B_SUB_VAL;
+    chtmp->rx.diff=0;
 
-    
-    maxlen = (hfc_B_FIFO_SIZE + hfc_B_SUB_VAL) - *z2;
-    if (maxlen > count) {
-        maxlen = count;
-    }
-    if (whichB == 1) {
-        memcpy(hfctmp->ztdev->chans[0].readchunk,(char *)(hfctmp->fifos + hfc_FIFO_B1RX_ZOFF + *z2), maxlen);
-    } else {
-        memcpy(hfctmp->ztdev->chans[1].readchunk,(char *)(hfctmp->fifos + hfc_FIFO_B2RX_ZOFF + *z2), maxlen);
-    }
-    newz2 = *z2 + count;
-    if (newz2 >= (hfc_B_FIFO_SIZE + hfc_B_SUB_VAL)) { 
-        newz2 -= hfc_B_FIFO_SIZE; 
+    chtmp->tx.c[0].z1p=(unsigned short *)(hfctmp->fifos+hfc_FIFO_B1TX_Z1+0x1f*4);
+    chtmp->tx.c[0].z2p=(unsigned short *)(hfctmp->fifos+hfc_FIFO_B1TX_Z2+0x1f*4);
+    chtmp->tx.c[0].fifo_base=(char *)(hfctmp->fifos+hfc_FIFO_B1TX_ZOFF);
+    chtmp->tx.c[0].filled=0;
+    chtmp->tx.c[1].z1p=(unsigned short *)(hfctmp->fifos+hfc_FIFO_B2TX_Z1+0x1f*4);
+    chtmp->tx.c[1].z2p=(unsigned short *)(hfctmp->fifos+hfc_FIFO_B2TX_Z2+0x1f*4);
+    chtmp->tx.c[1].fifo_base=(char *)(hfctmp->fifos+hfc_FIFO_B2TX_ZOFF);
+    chtmp->tx.c[1].filled=0;
+    chtmp->tx.z1=hfc_B_SUB_VAL;
+    chtmp->tx.diff=0;
+
+    hfc_dch_init(hfctmp);
+
+    chtmp->initialized=0;
+}
+
+static int hfc_bch_check(struct hfc_card *hfctmp){
+    struct bch *chtmp=&hfctmp->bch;
+    int x,r;
+
+    for(x=0;x<2;x++){
+	chtmp->tx.c[x].filled=(chtmp->tx.z1-*chtmp->tx.c[x].z2p+hfc_B_FIFO_SIZE)%hfc_B_FIFO_SIZE;
+	chtmp->rx.c[x].filled=(*chtmp->rx.c[x].z1p-chtmp->rx.z2+hfc_B_FIFO_SIZE)%hfc_B_FIFO_SIZE;
     }
-    *z2 = newz2;
-	
-    count -= maxlen;
-    if (count > 0) {
-    // Buffer wrap
-        if (whichB == 1) {
-	    z2 = (unsigned short *)(hfctmp->fifos + hfc_FIFO_B1RX_Z2 + (*f1 * 4));
-    	    memcpy(hfctmp->ztdev->chans[0].readchunk + maxlen,(char *)(hfctmp->fifos + hfc_FIFO_B1RX_ZOFF + hfc_B_SUB_VAL), count);
-	} else {
-	    z2 = (unsigned short *)(hfctmp->fifos + hfc_FIFO_B2RX_Z2 + (*f1 * 4));
-	    memcpy(hfctmp->ztdev->chans[1].readchunk + maxlen,(char *)(hfctmp->fifos + hfc_FIFO_B2RX_ZOFF + hfc_B_SUB_VAL), count);
-	}
-	newz2 = *z2 + count;
-	if (newz2 >= (hfc_B_FIFO_SIZE + hfc_B_SUB_VAL)) { 
-	    newz2 -= hfc_B_FIFO_SIZE; 
+    if(chtmp->fill_fifo){
+	chtmp->checkcnt++;
+	chtmp->checkcnt%=DAHDI_CHUNKSIZE;
+	r=!chtmp->checkcnt;
+    }else{
+	x=chtmp->tx.c[0].filled-chtmp->tx.c[1].filled;
+	if(abs(x-chtmp->tx.diff)>1){
+	    printk(KERN_CRIT "zaphfc[%d]: tx sync changed: %d, %d\n",hfctmp->cardno,chtmp->tx.c[0].filled,chtmp->tx.c[1].filled);
+	    chtmp->tx.diff=x;
 	}
+	r=chtmp->tx.c[0].filled<=DAHDI_CHUNKSIZE*jitterbuffer&&chtmp->tx.c[1].filled<=DAHDI_CHUNKSIZE*jitterbuffer;
     }
+    return(r);
+}
 
+#define hfc_bch_inc_z(a,b) (a)=((a)-hfc_B_SUB_VAL+(b))%hfc_B_FIFO_SIZE+hfc_B_SUB_VAL
 
-    if (whichB == 1) {
-	dahdi_ec_chunk(&hfctmp->ztdev->chans[0], hfctmp->ztdev->chans[0].readchunk, hfctmp->ztdev->chans[0].writechunk);
-    } else {
-	dahdi_ec_chunk(&hfctmp->ztdev->chans[1], hfctmp->ztdev->chans[1].readchunk, hfctmp->ztdev->chans[1].writechunk);
+static void hfc_bch_tx(struct hfc_card *hfctmp){
+    struct bch *chtmp=&hfctmp->bch;
+    int x;
+
+    for(x=0;x<2;x++)
+	memcpy((void *)(chtmp->tx.c[x].fifo_base+chtmp->tx.z1),hfctmp->ztdev->chans[x].writechunk,DAHDI_CHUNKSIZE);
+    hfc_bch_inc_z(chtmp->tx.z1,DAHDI_CHUNKSIZE);
+    if(chtmp->fill_fifo){
+	chtmp->fill_fifo--;
+    }else if(chtmp->tx.c[0].filled<=1||chtmp->tx.c[1].filled<=1){
+	chtmp->fill_fifo=jitterbuffer;
+	if(chtmp->initialized)
+	    printk(KERN_CRIT "zaphfc[%d]: b channel buffer underrun: %d, %d\n",hfctmp->cardno,chtmp->tx.c[0].filled,chtmp->tx.c[1].filled);
     }
-    return;    
+    if(!chtmp->fill_fifo)
+	for(x=0;x<2;x++)*chtmp->tx.c[x].z1p=chtmp->tx.z1;
 }
 
-
-static void hfc_dtrans(struct hfc_card *hfctmp) {
-    // we are called with irqs disabled from the irq handler
+static void hfc_bch_rx(struct hfc_card *hfctmp){
+    struct bch *chtmp=&hfctmp->bch;
     int x;
-    int count, maxlen, total;
-    unsigned char *f1, *f2, newf1;
-    unsigned short *z1, *z2, newz1;
-    int frames, freebytes;
 
-    if (hfctmp->ztdev->chans[2].bytes2transmit == 0) {
-	return;
+    x=chtmp->rx.c[0].filled-chtmp->rx.c[1].filled;
+    if(abs(x-chtmp->rx.diff)>1){
+	printk(KERN_CRIT "zaphfc[%d]: rx sync changed: %d, %d\n",hfctmp->cardno,chtmp->rx.c[0].filled,chtmp->rx.c[1].filled);
+	chtmp->rx.diff=x;
     }
-
-    f1 = (char *)(hfctmp->fifos + hfc_FIFO_DTX_F1);
-    f2 = (char *)(hfctmp->fifos + hfc_FIFO_DTX_F2);
-    z1 = (unsigned short *)(hfctmp->fifos + hfc_FIFO_DTX_Z1 + (*f1 * 4));
-    z2 = (unsigned short *)(hfctmp->fifos + hfc_FIFO_DTX_Z2 + (*f1 * 4));
-
-    frames = (*f1 - *f2) & hfc_FMASK;
-    if (frames < 0) {
-	frames += hfc_MAX_DFRAMES + 1;
+    if(chtmp->rx.c[0].filled>=DAHDI_CHUNKSIZE&&chtmp->rx.c[1].filled>=DAHDI_CHUNKSIZE){
+	if((chtmp->rx.c[0].filled>=DAHDI_CHUNKSIZE*(jitterbuffer+2)&&chtmp->rx.c[1].filled>=DAHDI_CHUNKSIZE*(jitterbuffer+2))||!chtmp->initialized){
+	    if(chtmp->initialized)
+		printk(KERN_CRIT "zaphfc[%d]: b channel buffer overflow: %d, %d\n",hfctmp->cardno,chtmp->rx.c[0].filled,chtmp->rx.c[1].filled);
+	    hfc_bch_inc_z(chtmp->rx.z2,chtmp->rx.c[0].filled-chtmp->rx.c[0].filled%DAHDI_CHUNKSIZE-DAHDI_CHUNKSIZE);
+	    chtmp->initialized=1;
+	}
+	for(x=0;x<2;x++){
+	    memcpy(hfctmp->ztdev->chans[x].readchunk,(void *)(chtmp->rx.c[x].fifo_base+chtmp->rx.z2),DAHDI_CHUNKSIZE);
+	    dahdi_ec_chunk(&hfctmp->ztdev->chans[x],hfctmp->ztdev->chans[x].readchunk,hfctmp->ztdev->chans[x].writechunk);
+	}
+	hfc_bch_inc_z(chtmp->rx.z2,DAHDI_CHUNKSIZE);
     }
+}
 
-    if (frames >= hfc_MAX_DFRAMES) {
-	printk(KERN_CRIT "zaphfc: dchan tx fifo total number of frames exceeded!\n");
-	return;
-    }
+/*===========================================================================*/
 
-    freebytes = *z2 - *z1;
-    if (freebytes <= 0) {
-	freebytes += hfc_D_FIFO_SIZE;
-    }
-    count = hfctmp->ztdev->chans[2].bytes2transmit;
-
-    total = count;
-    if (freebytes < count) {
-	printk(KERN_CRIT "zaphfc: dchan tx fifo not enough free bytes! (z1=%d, z2=%d)\n",*z1,*z2);
-	return;
-    }
-    
-    newz1 = (*z1 + count) & hfc_ZMASK;
-    newf1 = ((*f1 + 1) & hfc_MAX_DFRAMES) | (hfc_MAX_DFRAMES + 1);	// next frame
-    
-    if (count > 0) {
-	if (debug) {
-    	    printk(KERN_CRIT "zaphfc: card %d TX [ ", hfctmp->cardno);
-	    for (x=0; x<count; x++) {
+static void hfc_dch_tx(struct hfc_card *hfctmp){
+    struct dch *chtmp=&hfctmp->dch;
+    u8 tx_f2_v;
+    u16 x;
+
+    if(hfctmp->ztdev->chans[2].bytes2transmit){
+	if(debug){
+	    printk(KERN_CRIT "zaphfc[%d]: card TX [ ",hfctmp->cardno);
+	    for(x=0;x<hfctmp->ztdev->chans[2].bytes2transmit;x++){
 		printk("%#2x ",hfctmp->dtransbuf[x]);
 	    }
-	    if (hfctmp->ztdev->chans[2].eoftx == 1) {
-		printk("] %d bytes\n", count);
-	    } else {
-		printk("..] %d bytes\n", count);
-	    }
-	}
-	maxlen = hfc_D_FIFO_SIZE - *z1;
-	if (maxlen > count) {
-	    maxlen = count;
+	    printk("] %d bytes\n",hfctmp->ztdev->chans[2].bytes2transmit);
 	}
-	memcpy((char *)(hfctmp->fifos + hfc_FIFO_DTX_ZOFF + *z1),hfctmp->ztdev->chans[2].writechunk, maxlen);
-	count -= maxlen;
-	if (count > 0) {
-	    memcpy((char *)(hfctmp->fifos + hfc_FIFO_DTX_ZOFF),(char *)(hfctmp->ztdev->chans[2].writechunk + maxlen), count);
+	tx_f2_v=*chtmp->tx.f2.p;
+	if(!(tx_f2_v-chtmp->tx.f1.v+hfc_MAX_DFRAMES+1-1)&(hfc_MAX_DFRAMES+1-1)){
+	    printk(KERN_CRIT "zaphfc[%d]: dchan tx fifo total number of frames exceeded!\n",hfctmp->cardno);
+	}else{
+	    if(((*(volatile u16 *)(hfctmp->fifos+hfc_FIFO_DTX_Z2+tx_f2_v*4)-chtmp->tx.f1.z1.v+hfc_D_FIFO_SIZE-1)&(hfc_D_FIFO_SIZE-1))<hfctmp->ztdev->chans[2].bytes2transmit){
+		printk(KERN_CRIT "zaphfc[%d]: dchan tx fifo not enough space for frame!\n",hfctmp->cardno);
+	    }else{
+		chtmp->tx.f1.v=((chtmp->tx.f1.v+1)&hfc_MAX_DFRAMES)|(hfc_MAX_DFRAMES+1);
+		x=min(hfctmp->ztdev->chans[2].bytes2transmit,hfc_D_FIFO_SIZE-chtmp->tx.f1.z1.v);
+		memcpy(hfctmp->fifos+hfc_FIFO_DTX_ZOFF+chtmp->tx.f1.z1.v,hfctmp->ztdev->chans[2].writechunk,x);
+		memcpy(hfctmp->fifos+hfc_FIFO_DTX_ZOFF,hfctmp->ztdev->chans[2].writechunk+x,hfctmp->ztdev->chans[2].bytes2transmit-x);
+		*(volatile u16 *)(hfctmp->fifos+hfc_FIFO_DTX_Z2+chtmp->tx.f1.v*4)=chtmp->tx.f1.z1.v;
+		chtmp->tx.f1.z1.v=(chtmp->tx.f1.z1.v+hfctmp->ztdev->chans[2].bytes2transmit+hfc_D_FIFO_SIZE)&(hfc_D_FIFO_SIZE-1);
+		*(volatile u16 *)(hfctmp->fifos+hfc_FIFO_DTX_Z1+chtmp->tx.f1.v*4)=chtmp->tx.f1.z1.v;
+		*chtmp->tx.f1.p=chtmp->tx.f1.v;
+	    }
 	}
     }
-
-    *z1 = newz1;
-
-    if (hfctmp->ztdev->chans[2].eoftx == 1) {
-	*f1 = newf1;
-	z1 = (unsigned short *)(hfctmp->fifos + hfc_FIFO_DTX_Z1 + (*f1 * 4));
-	*z1 = newz1;
-	hfctmp->ztdev->chans[2].eoftx = 0;
-    }
-//    printk(KERN_CRIT "zaphfc: dchan tx fifo (f1=%d, f2=%d, z1=%d, z2=%d)\n",(*f1) & hfc_FMASK,(*f2) & hfc_FMASK, *z1, *z2);
-    return;    
 }
 
-/* receive a complete hdlc frame, skip broken or short frames */
-static void hfc_drec(struct hfc_card *hfctmp) {
-    int count=0, maxlen=0, framelen=0;
-    unsigned char *f1, *f2, *crcstat;
-    unsigned short *z1, *z2, oldz2, newz2;
+static void hfc_dch_rx(struct hfc_card *hfctmp){
+    struct dch *chtmp=&hfctmp->dch;
+    u16 size;
 
     hfctmp->ztdev->chans[2].bytes2receive=0;
-    hfctmp->ztdev->chans[2].eofrx = 0;
-
-    /* put the received data into the DAHDI buffer
-       we'll call dahdi_receive() later when the timer fires. */
-    f1 = (char *)(hfctmp->fifos + hfc_FIFO_DRX_F1);
-    f2 = (char *)(hfctmp->fifos + hfc_FIFO_DRX_F2);
-
-    if (*f1 == *f2) return; /* nothing received, strange eh? */
-
-    z1 = (unsigned short *)(hfctmp->fifos + hfc_FIFO_DRX_Z1 + (*f2 * 4));
-    z2 = (unsigned short *)(hfctmp->fifos + hfc_FIFO_DRX_Z2 + (*f2 * 4));
-    
-    /* calculate length of frame, including 2 bytes CRC and 1 byte STAT */
-    count = *z1 - *z2;
-    
-    if (count < 0) { 
-	count += hfc_D_FIFO_SIZE; /* ring buffer wrapped */
-    }
-    count++;
-    framelen = count;
-
-    crcstat = (char *)(hfctmp->fifos + hfc_FIFO_DRX_ZOFF + *z1);
-
-    if ((framelen < 4) || (*crcstat != 0x0)) {
-	/* the frame is too short for a valid HDLC frame or the CRC is borked */
-	printk(KERN_CRIT "zaphfc: empty HDLC frame or bad CRC received (framelen = %d, stat = %#x, card = %d).\n", framelen, *crcstat, hfctmp->cardno);
-	oldz2 = *z2;
-	*f2 = ((*f2 + 1) & hfc_MAX_DFRAMES) | (hfc_MAX_DFRAMES + 1);	/* NEXT!!! */
-        // recalculate z2, because Z2 is a function of F2 Z2(F2) and we INCed F2!!!
-	z2 = (unsigned short *)(hfctmp->fifos + hfc_FIFO_DRX_Z2 + (*f2 * 4));
-	*z2 = (oldz2 + framelen) & hfc_ZMASK;
-	hfctmp->drecinframe = 0;
-	hfctmp->regs.int_drec--;
-	/* skip short or broken frames */
-        hfctmp->ztdev->chans[2].bytes2receive = 0; 
-	return;
-    }
-
-    count -= 1;	/* strip STAT */
-    hfctmp->ztdev->chans[2].eofrx = 1;
-
-    if (count + *z2 <= hfc_D_FIFO_SIZE) {
-	maxlen = count;
-    } else {
-	maxlen = hfc_D_FIFO_SIZE - *z2;
+    hfctmp->ztdev->chans[2].eofrx=0;
+    if(*chtmp->rx.f1.p==chtmp->rx.f2.v){
+	hfctmp->regs.int_drec=0;
+    }else{
+	size=((*(volatile u16 *)(hfctmp->fifos+hfc_FIFO_DRX_Z1+chtmp->rx.f2.v*4)-chtmp->rx.f2.z2.v+hfc_D_FIFO_SIZE)&(hfc_D_FIFO_SIZE-1))+1;
+	if(size<4){
+	    printk(KERN_CRIT "zaphfc[%d]: empty HDLC frame received.\n",hfctmp->cardno);
+	}else{
+	    u16 x=min(size,(u16)(hfc_D_FIFO_SIZE-chtmp->rx.f2.z2.v));
+	    memcpy(hfctmp->drecbuf,hfctmp->fifos+hfc_FIFO_DRX_ZOFF+chtmp->rx.f2.z2.v,x);
+	    memcpy(hfctmp->drecbuf+x,hfctmp->fifos+hfc_FIFO_DRX_ZOFF,size-x);
+	    if(hfctmp->drecbuf[size-1]){
+		printk(KERN_CRIT "zaphfc[%d]: received d channel frame with bad CRC.\n",hfctmp->cardno);
+	    }else{
+		hfctmp->ztdev->chans[2].bytes2receive=size-1;
+		hfctmp->ztdev->chans[2].eofrx=1;
+	    }
+	}
+	chtmp->rx.f2.z2.v=(chtmp->rx.f2.z2.v+size)&(hfc_D_FIFO_SIZE-1);
+	chtmp->rx.f2.v=((chtmp->rx.f2.v+1)&hfc_MAX_DFRAMES)|(hfc_MAX_DFRAMES+1);
     }
-
-    /* copy first part */
-    memcpy(hfctmp->drecbuf, (char *)(hfctmp->fifos + hfc_FIFO_DRX_ZOFF + *z2), maxlen);
-    hfctmp->ztdev->chans[2].bytes2receive += maxlen; 
-    
-    count -= maxlen;
-    if (count > 0) {
-	/* ring buffer wrapped, copy rest from start of d fifo */
-	memcpy(hfctmp->drecbuf + maxlen, (char *)(hfctmp->fifos + hfc_FIFO_DRX_ZOFF), count);
-	hfctmp->ztdev->chans[2].bytes2receive += count; 
-    }
-
-    /* frame read */
-    oldz2 = *z2;
-    newz2 = (oldz2 + framelen) & hfc_ZMASK;
-    *f2 = ((*f2 + 1) & hfc_MAX_DFRAMES) | (hfc_MAX_DFRAMES + 1);	/* NEXT!!! */
-    /* recalculate z2, because Z2 is a function of F2 Z2(F2) and we INCed F2!!! */
-    z2 = (unsigned short *)(hfctmp->fifos + hfc_FIFO_DRX_Z2 + (*f2 * 4));
-    *z2 = newz2;
-    hfctmp->drecinframe = 0;
-    hfctmp->regs.int_drec--; 
 }
 
-#ifndef RTAITIMING
 DAHDI_IRQ_HANDLER(hfc_interrupt) {
     struct hfc_card *hfctmp = dev_id;
-    unsigned long flags = 0;
-    unsigned char stat;
-#else
-static void hfc_service(struct hfc_card *hfctmp) {
-#endif
+    struct hfc_card *hfctmp2;
     struct dahdi_hfc *zthfc;
-    unsigned char s1, s2, l1state;
+    unsigned char stat, s1, s2, l1state;
+    unsigned long flags = 0;
+    unsigned long flags2 = 0;
     int x;
 
     if (!hfctmp) {
-#ifndef RTAITIMING
-		return IRQ_NONE;
-#else
-	/* rtai */
-	return;
-#endif
+	    return IRQ_NONE;
     }
 
     if (!hfctmp->pci_io) {
 	    printk(KERN_WARNING "%s: IO-mem disabled, cannot handle interrupt\n",
 		   __FUNCTION__);
-#ifndef RTAITIMING
 	    return IRQ_NONE;
-#else
-	/* rtai */
-	return;
-#endif
     }
     
-    /*	we assume a few things in this irq handler:
-	- the hfc-pci will only generate "timer" irqs (proc/non-proc)
-	- we need to use every 8th IRQ (to generate 1khz timing)
-	OR
-	- if we use rtai for timing the hfc-pci will not generate ANY irq,
-	  instead rtai will call this "fake" irq with a 1khz realtime timer. :)
-	- rtai will directly service the card, not like it used to by triggering
-	  the linux irq
-    */
-
-#ifndef RTAITIMING
     spin_lock_irqsave(&hfctmp->lock, flags);
     stat = hfc_inb(hfctmp, hfc_STATUS);
-
     if ((stat & hfc_STATUS_ANYINT) == 0) {
         // maybe we are sharing the irq
 	spin_unlock_irqrestore(&hfctmp->lock,flags);
 	return IRQ_NONE;
     }
-#endif
 
     s1 = hfc_inb(hfctmp, hfc_INT_S1);
     s2 = hfc_inb(hfctmp, hfc_INT_S2); 
@@ -611,18 +457,10 @@
 		}
 		switch (l1state) {
 		    case 3:
-#ifdef RTAITIMING
-			sprintf(zthfc->span.desc, "HFC-S PCI A ISDN card %d [NT] layer 1 ACTIVATED (G%d) [realtime]", hfctmp->cardno, l1state);
-#else
 			sprintf(zthfc->span.desc, "HFC-S PCI A ISDN card %d [NT] layer 1 ACTIVATED (G%d)", hfctmp->cardno, l1state);
-#endif
 			break;
 		    default:
-#ifdef RTAITIMING
-			sprintf(zthfc->span.desc, "HFC-S PCI A ISDN card %d [NT] layer 1 DEACTIVATED (G%d) [realtime]", hfctmp->cardno, l1state);
-#else
 			sprintf(zthfc->span.desc, "HFC-S PCI A ISDN card %d [NT] layer 1 DEACTIVATED (G%d)", hfctmp->cardno, l1state);
-#endif
 		}
 		if (l1state == 2) {
 		    hfc_outb(hfctmp, hfc_STATES, hfc_STATES_ACTIVATE | hfc_STATES_DO_ACTION | hfc_STATES_NT_G2_G3);
@@ -636,18 +474,10 @@
 		}
 		switch (l1state) {
 		    case 7:
-#ifdef RTAITIMING
-			sprintf(zthfc->span.desc, "HFC-S PCI A ISDN card %d [TE] layer 1 ACTIVATED (F%d) [realtime]", hfctmp->cardno, l1state);
-#else
 			sprintf(zthfc->span.desc, "HFC-S PCI A ISDN card %d [TE] layer 1 ACTIVATED (F%d)", hfctmp->cardno, l1state);
-#endif
 			break;
 		    default:
-#ifdef RTAITIMING
-			sprintf(zthfc->span.desc, "HFC-S PCI A ISDN card %d [TE] layer 1 DEACTIVATED (F%d) [realtime]", hfctmp->cardno, l1state);
-#else
 			sprintf(zthfc->span.desc, "HFC-S PCI A ISDN card %d [TE] layer 1 DEACTIVATED (F%d)", hfctmp->cardno, l1state);
-#endif
 		}
 		if (l1state == 3) {
 		    hfc_outb(hfctmp, hfc_STATES, hfc_STATES_DO_ACTION | hfc_STATES_ACTIVATE);
@@ -657,7 +487,7 @@
 	}
 	if (s1 & hfc_INTS_DREC) {
 	    // D chan RX (bit 5)
-	    hfctmp->regs.int_drec++;
+	    hfctmp->regs.int_drec = 1;
 	    // mr. zapata there is something for you!
 	//    printk(KERN_CRIT "d chan rx\n");		    
 	}
@@ -678,14 +508,10 @@
 	    // B1 chan TX (bit 0)
 	}
     }
-#ifdef RTAITIMING
-    /* fake an irq */
-    s2 |= hfc_M2_PROC_TRANS;
-#endif
     if (s2 != 0) {
 	if (s2 & hfc_M2_PMESEL) {
 	    // kaboom irq (bit 7)
-	    printk(KERN_CRIT "zaphfc: sync lost, pci performance too low. you might have some cpu throtteling enabled.\n");
+	    //printk(KERN_CRIT "zaphfc: sync lost, pci performance too low. you might have some cpu throtteling enabled.\n");
 	}
 	if (s2 & hfc_M2_GCI_MON_REC) {
 	    // RxR monitor channel (bit 2)
@@ -693,32 +519,31 @@
 	if (s2 & hfc_M2_GCI_I_CHG) {
 	    // GCI I-change  (bit 1)
 	}
-	if (s2 & hfc_M2_PROC_TRANS) {
+	if((s2&hfc_M2_PROC_TRANS)&&(hfctmp->cardno==timer_card)){
 	    // processing/non-processing transition  (bit 0)
-	    hfctmp->ticks++;
-#ifndef RTAITIMING
-	    if (hfctmp->ticks > 7) {
-		// welcome to DAHDI timing :)
-#endif
-	    	hfctmp->ticks = 0;
-
-		if (hfctmp->ztdev->span.flags & DAHDI_FLAG_RUNNING) {
+	hfctmp2=hfctmp;
+	hfctmp=hfc_dev_list;
+	while(hfctmp){
+	    if(hfctmp->active){
+	    if(hfctmp!=hfctmp2)spin_lock_irqsave(&hfctmp->lock, flags2);
+	    if(hfc_bch_check(hfctmp)){
+    if (hfctmp->ztdev->span.flags & DAHDI_FLAG_RUNNING) {
 		    // clear dchan buffer
+	//	    memset(hfctmp->drecbuf, 0x0, sizeof(hfctmp->drecbuf));
+
 		    hfctmp->ztdev->chans[2].bytes2transmit = 0;
 		    hfctmp->ztdev->chans[2].maxbytes2transmit = hfc_D_FIFO_SIZE;
 
 		    dahdi_transmit(&(hfctmp->ztdev->span));
 
-		    hfc_btrans(hfctmp,1);
-		    hfc_btrans(hfctmp,2);
-		    hfc_dtrans(hfctmp);
+		    hfc_bch_tx(hfctmp);
+		    hfc_dch_tx(hfctmp);
 		}
 
-		hfc_brec(hfctmp,1);
-		hfc_brec(hfctmp,2);
-		if (hfctmp->regs.int_drec > 0) {
+		hfc_bch_rx(hfctmp);
+		if (hfctmp->regs.int_drec) {
 		    // dchan data to read
-		    hfc_drec(hfctmp);
+		    hfc_dch_rx(hfctmp);
 		    if (hfctmp->ztdev->chans[2].bytes2receive > 0) {
 			    if (debug) {
     				printk(KERN_CRIT "zaphfc: card %d RX [ ", hfctmp->cardno);
@@ -743,17 +568,16 @@
 		if (hfctmp->ztdev->span.flags & DAHDI_FLAG_RUNNING) {
 		    dahdi_receive(&(hfctmp->ztdev->span));
 		}
-		
-#ifndef RTAITIMING
 	    }
-#endif
+	    if(hfctmp!=hfctmp2)spin_unlock_irqrestore(&hfctmp->lock,flags2);
+	    }
+	    hfctmp=hfctmp->next;
+	}
+	hfctmp=hfctmp2;
 	}
-
     }
-#ifndef RTAITIMING
     spin_unlock_irqrestore(&hfctmp->lock,flags);
-	return IRQ_RETVAL(1);
-#endif
+    return IRQ_RETVAL(1);
 }
 
 
@@ -802,22 +626,22 @@
     }
     alreadyrunning = span->flags & DAHDI_FLAG_RUNNING;
     
-    if (!alreadyrunning) {
-	span->chans[2]->flags &= ~DAHDI_FLAG_HDLC;
-	span->chans[2]->flags |= DAHDI_FLAG_BRIDCHAN;
-	
-	span->flags |= DAHDI_FLAG_RUNNING;
+    if (alreadyrunning) return 0;
 
-	hfctmp->ticks = -2;
-	hfctmp->clicks = 0;
-	hfctmp->regs.fifo_en = hfc_FIFOEN_D | hfc_FIFOEN_B1 | hfc_FIFOEN_B2;
-        hfc_outb(hfctmp, hfc_FIFO_EN, hfctmp->regs.fifo_en);
-    } else {
-	return 0;
-    }
+    span->chans[2]->flags &= ~DAHDI_FLAG_HDLC;
+    span->chans[2]->flags |= DAHDI_FLAG_BRIDCHAN;
+
+    span->flags |= DAHDI_FLAG_RUNNING;
+
+    hfctmp->ticks = -2;
+    hfctmp->regs.fifo_en = hfc_FIFOEN_D | hfc_FIFOEN_B1 | hfc_FIFOEN_B2;
+    hfc_outb(hfctmp, hfc_FIFO_EN, hfctmp->regs.fifo_en);
+
+    hfc_bch_init(hfctmp);
 
     // drivers, start engines!
     hfc_outb(hfctmp, hfc_STATES, hfc_STATES_DO_ACTION | hfc_STATES_ACTIVATE);
+    hfctmp->active=1;
     return 0;
 }
 
@@ -847,17 +671,9 @@
 
     sprintf(zthfc->span.name, "ZTHFC%d", hfc_dev_count + 1);
     if (hfctmp->regs.nt_mode == 1) {
-#ifdef RTAITIMING
-	sprintf(zthfc->span.desc, "HFC-S PCI A ISDN card %d [NT] [realtime]", hfc_dev_count + 1);
-#else
 	sprintf(zthfc->span.desc, "HFC-S PCI A ISDN card %d [NT]", hfc_dev_count + 1);
-#endif
     } else {
-#ifdef RTAITIMING
-	sprintf(zthfc->span.desc, "HFC-S PCI A ISDN card %d [TE] [realtime]", hfc_dev_count + 1);
-#else
 	sprintf(zthfc->span.desc, "HFC-S PCI A ISDN card %d [TE]", hfc_dev_count + 1);
-#endif
     }
 
     zthfc->span.spanconfig = zthfc_spanconfig;
@@ -897,32 +713,6 @@
     return 0;
 }
 
-#ifdef RTAITIMING
-#define TICK_PERIOD  1000000
-#define TICK_PERIOD2 1000000000
-#define TASK_PRIORITY 1
-#define STACK_SIZE 10000
-
-static RT_TASK rt_task;
-static struct hfc_card *rtai_hfc_list[hfc_MAX_CARDS];
-static unsigned char rtai_hfc_counter = 0;
-
-static void rtai_register_hfc(struct hfc_card *hfctmp) {
-    rtai_hfc_list[rtai_hfc_counter++] = hfctmp;
-}
-
-static void rtai_loop(int t) {
-    int i=0;
-    for (;;) {
-	for (i=0; i < rtai_hfc_counter; i++) {
-	    if (rtai_hfc_list[i] != NULL)
-		hfc_service(rtai_hfc_list[i]);
-	}
-        rt_task_wait_period();
-    }
-}
-#endif
-
 int hfc_findCards(int pcivendor, int pcidevice, char *vendor_name, char *card_name) {
     struct pci_dev *tmp;
     struct hfc_card *hfctmp = NULL;
@@ -938,9 +728,9 @@
 	}
 	pci_set_master(tmp);
 
-	hfctmp = kmalloc(sizeof(struct hfc_card), GFP_KERNEL);
+	hfctmp = vmalloc(sizeof(struct hfc_card));
 	if (!hfctmp) {
-	    printk(KERN_WARNING "zaphfc: unable to kmalloc!\n");
+	    printk(KERN_WARNING "zaphfc: unable to vmalloc!\n");
 	    pci_disable_device(tmp);
 	    multi_hfc = NULL;
 	    return -ENOMEM;
@@ -948,6 +738,7 @@
 	memset(hfctmp, 0x0, sizeof(struct hfc_card));
 	spin_lock_init(&hfctmp->lock);
 	
+	hfctmp->active=0;
 	hfctmp->pcidev = tmp;
 	hfctmp->pcibus = tmp->bus->number;
 	hfctmp->pcidevfn = tmp->devfn; 
@@ -961,49 +752,39 @@
 	hfctmp->pci_io = (char *) tmp->resource[1].start;
 	if (!hfctmp->pci_io) {
 	    printk(KERN_WARNING "zaphfc: no iomem!\n");
-	    kfree(hfctmp);
+	    vfree(hfctmp);
 	    pci_disable_device(tmp);
 	    multi_hfc = NULL;
 	    return -1;
 	}
-	
-	hfctmp->fifomem = kmalloc(65536, GFP_KERNEL);
-	if (!hfctmp->fifomem) {
-	    printk(KERN_WARNING "zaphfc: unable to kmalloc fifomem!\n");
-	    kfree(hfctmp);
+
+	hfctmp->fifos=(void *)__get_free_pages(GFP_KERNEL,log2(hfc_FIFO_MEM_SIZE_PAGES));
+	if (!hfctmp->fifos) {
+	    printk(KERN_WARNING "zaphfc: unable to __get_free_pages fifomem!\n");
+	    vfree(hfctmp);
 	    pci_disable_device(tmp);
 	    multi_hfc = NULL;
 	    return -ENOMEM;
 	} else {
-	    memset(hfctmp->fifomem, 0x0, 65536);
-	    hfctmp->fifos = (void *)(((ulong) hfctmp->fifomem) & ~0x7FFF) + 0x8000;
 	    pci_write_config_dword(hfctmp->pcidev, 0x80, (u_int) virt_to_bus(hfctmp->fifos));
 	    hfctmp->pci_io = ioremap((ulong) hfctmp->pci_io, 256);
 	}
 
-#ifdef RTAITIMING
-	/* we need no stinking irq */
-	hfctmp->irq = 0;
-#else
 	if (request_irq(hfctmp->irq, &hfc_interrupt, DAHDI_IRQ_SHARED, "zaphfc", hfctmp)) {
 	    printk(KERN_WARNING "zaphfc: unable to register irq\n");
-	    kfree(hfctmp->fifomem);
-	    kfree(hfctmp);
+	    free_pages((unsigned long)hfctmp->fifos,log2(hfc_FIFO_MEM_SIZE_PAGES));
+	    vfree(hfctmp);
 	    iounmap((void *) hfctmp->pci_io);
 	    pci_disable_device(tmp);
 	    multi_hfc = NULL;
 	    return -EIO;
 	}
-#endif
 
-#ifdef RTAITIMING
-	rtai_register_hfc(hfctmp);
-#endif
 	printk(KERN_INFO
-		       "zaphfc: %s %s configured at mem %lx fifo %lx(%#x) IRQ %d HZ %d\n",
+		       "zaphfc: %s %s configured at mem %#x fifo %#x(%#x) IRQ %d HZ %d\n",
 			vendor_name, card_name,
-		       (unsigned long) hfctmp->pci_io,
-		       (unsigned long) hfctmp->fifos,
+		       (u_int) hfctmp->pci_io,
+		       (u_int) hfctmp->fifos,
 		       (u_int) virt_to_bus(hfctmp->fifos),
 		       hfctmp->irq, HZ); 
 	pci_write_config_word(hfctmp->pcidev, PCI_COMMAND, PCI_COMMAND_MEMORY);	// enable memio
@@ -1020,11 +801,21 @@
 	    hfctmp->regs.nt_mode = 0;
 	}
 
-	zthfc = kmalloc(sizeof(struct dahdi_hfc),GFP_KERNEL);
+	if(sync_slave&(1<<hfc_dev_count)){
+	    printk(KERN_INFO "zaphfc: Card %d configured for slave mode\n",hfc_dev_count);
+	    hfctmp->regs.mst_mode=hfc_MST_MODE_SLAVE|hfc_MST_MODE_F0_LONG_DURATION;
+	    hfctmp->regs.mst_emod=hfc_MST_EMOD_SLOW_CLOCK_ADJ;
+	}else{
+	    printk(KERN_INFO "zaphfc: Card %d configured for master mode\n",hfc_dev_count);
+	    hfctmp->regs.mst_mode=hfc_MST_MODE_MASTER|hfc_MST_MODE_F0_LONG_DURATION;
+	    hfctmp->regs.mst_emod=0;
+	}
+
+	zthfc = vmalloc(sizeof(struct dahdi_hfc));
 	if (!zthfc) {
-	    printk(KERN_CRIT "zaphfc: unable to kmalloc!\n");
+	    printk(KERN_CRIT "zaphfc: unable to vmalloc!\n");
 	    hfc_shutdownCard(hfctmp);
-	    kfree(hfctmp);
+	    vfree(hfctmp);
 	    multi_hfc = NULL;
 	    return -ENOMEM;
 	}
@@ -1050,7 +841,6 @@
 	memset(hfctmp->btransbuf[1], 0x0, sizeof(hfctmp->btransbuf[1]));
 	hfctmp->ztdev->chans[1].writechunk = hfctmp->btransbuf[1];
 
-
 	hfc_registerCard(hfctmp);
 	hfc_resetCard(hfctmp);
 	tmp = pci_get_device(pcivendor, pcidevice, multi_hfc);
@@ -1058,58 +848,42 @@
     return 0;
 }
 
-
-
 int init_module(void) {
     int i = 0;
-#ifdef RTAITIMING
-    RTIME tick_period;
-    for (i=0; i < hfc_MAX_CARDS; i++) {
-	rtai_hfc_list[i] = NULL;
+    if(jitterbuffer<1){
+	printk(KERN_INFO "zaphfc: invalid jitterbuffer size specified: %d - changing to minimum of 1\n",jitterbuffer);
+	jitterbuffer=1;
+    }else if(jitterbuffer>500){
+	printk(KERN_INFO "zaphfc: invalid jitterbuffer size specified: %d - changing to maximum of 500\n",jitterbuffer);
+	jitterbuffer=500;
     }
-    rt_set_periodic_mode();
-#endif
-    i = 0;
+    printk(KERN_INFO "zaphfc: jitterbuffer size: %d\n",jitterbuffer);
     while (id_list[i].vendor_id) {
 	multi_hfc = NULL;
 	hfc_findCards(id_list[i].vendor_id, id_list[i].device_id, id_list[i].vendor_name, id_list[i].card_name);
 	i++;
     }
-#ifdef RTAITIMING
-    for (i=0; i < hfc_MAX_CARDS; i++) {
-        if (rtai_hfc_list[i]) {
-	    printk(KERN_INFO
-		       "zaphfc: configured %d at mem %#x fifo %#x(%#x) for realtime servicing\n",
-			rtai_hfc_list[i]->cardno,
-		       (u_int) rtai_hfc_list[i]->pci_io,
-		       (u_int) rtai_hfc_list[i]->fifos,
-		       (u_int) virt_to_bus(rtai_hfc_list[i]->fifos));
-
-	}
-    }
-    rt_task_init(&rt_task, rtai_loop, 1, STACK_SIZE, TASK_PRIORITY, 0, 0);
-    tick_period = start_rt_timer(nano2count(TICK_PERIOD));
-    rt_task_make_periodic(&rt_task, rt_get_time() + tick_period, tick_period);
-#endif
     printk(KERN_INFO "zaphfc: %d hfc-pci card(s) in this box.\n", hfc_dev_count);
     return 0;
 }
 
 void cleanup_module(void) {
     struct hfc_card *tmpcard;
-#ifdef RTAITIMING
-    stop_rt_timer();
-    rt_task_delete(&rt_task);
-#endif
+
     printk(KERN_INFO "zaphfc: stop\n");
 //    spin_lock(&registerlock);
+    tmpcard=hfc_dev_list;
+    while(tmpcard){
+	hfc_shutdownCard1(tmpcard);
+	tmpcard=tmpcard->next;
+    }
     while (hfc_dev_list != NULL) {
 	if (hfc_dev_list == NULL) break;
-	hfc_shutdownCard(hfc_dev_list);
+	hfc_shutdownCard2(hfc_dev_list);
 	tmpcard = hfc_dev_list;
 	hfc_dev_list = hfc_dev_list->next;
 	if (tmpcard != NULL) {
-	    kfree(tmpcard);
+	    vfree(tmpcard);
 	    tmpcard = NULL;
 	    printk(KERN_INFO "zaphfc: freed one card.\n");
 	}
@@ -1119,8 +893,11 @@
 #endif
 
 
-module_param(modes, int, 0600);
+module_param(modes, int, 0400);
 module_param(debug, int, 0600);
+module_param(sync_slave, int, 0400);
+module_param(timer_card, int, 0400);
+module_param(jitterbuffer, int, 0400);
 
 MODULE_DESCRIPTION("HFC-S PCI A Zaptel Driver");
 MODULE_AUTHOR("Klaus-Peter Junghanns <kpj@junghanns.net>");