aboutsummaryrefslogblamecommitdiffstats
path: root/drivers/atm/zatm.c
blob: 55959e4d1cb77d3aef5269340fff23241f873d58 (plain) (tree)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
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
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

















                                                           

                       
                              




























































































































































































































































































































































































                                                                               
                                     















                                                                                
                                
                                                     
                                                  


                                                                
































































































































































































































































































































































































































































































                                                                               
                              

































































































































































































































































































































































                                                                                

                                                  

                           
                         

                                
                                                   






                                                                                
         

























                                                                            




















                                                                               
                 










                                                                               
                              

                         
                              

                            
                                     

                            


                                                               



                     
                                
       
                                





                                                                   
                                     
                  








































































































































































































































































































                                                                                      
/* drivers/atm/zatm.c - ZeitNet ZN122x device driver */
 
/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */


#include <linux/config.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/pci.h>
#include <linux/errno.h>
#include <linux/atm.h>
#include <linux/atmdev.h>
#include <linux/sonet.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/delay.h>
#include <linux/uio.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
#include <linux/atm_zatm.h>
#include <linux/capability.h>
#include <linux/bitops.h>
#include <linux/wait.h>
#include <asm/byteorder.h>
#include <asm/system.h>
#include <asm/string.h>
#include <asm/io.h>
#include <asm/atomic.h>
#include <asm/uaccess.h>

#include "uPD98401.h"
#include "uPD98402.h"
#include "zeprom.h"
#include "zatm.h"


/*
 * TODO:
 *
 * Minor features
 *  - support 64 kB SDUs (will have to use multibuffer batches then :-( )
 *  - proper use of CDV, credit = max(1,CDVT*PCR)
 *  - AAL0
 *  - better receive timestamps
 *  - OAM
 */

#define ZATM_COPPER	1

#if 0
#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
#else
#define DPRINTK(format,args...)
#endif

#ifndef CONFIG_ATM_ZATM_DEBUG


#define NULLCHECK(x)

#define EVENT(s,a,b)


static void event_dump(void)
{
}


#else


/* 
 * NULL pointer checking
 */

#define NULLCHECK(x) \
  if ((unsigned long) (x) < 0x30) printk(KERN_CRIT #x "==0x%x\n", (int) (x))

/*
 * Very extensive activity logging. Greatly improves bug detection speed but
 * costs a few Mbps if enabled.
 */

#define EV 64

static const char *ev[EV];
static unsigned long ev_a[EV],ev_b[EV];
static int ec = 0;


static void EVENT(const char *s,unsigned long a,unsigned long b)
{
	ev[ec] = s; 
	ev_a[ec] = a;
	ev_b[ec] = b;
	ec = (ec+1) % EV;
}


static void event_dump(void)
{
	int n,i;

	printk(KERN_NOTICE "----- event dump follows -----\n");
	for (n = 0; n < EV; n++) {
		i = (ec+n) % EV;
		printk(KERN_NOTICE);
		printk(ev[i] ? ev[i] : "(null)",ev_a[i],ev_b[i]);
	}
	printk(KERN_NOTICE "----- event dump ends here -----\n");
}


#endif /* CONFIG_ATM_ZATM_DEBUG */


#define RING_BUSY	1	/* indication from do_tx that PDU has to be
				   backlogged */

static struct atm_dev *zatm_boards = NULL;
static unsigned long dummy[2] = {0,0};


#define zin_n(r) inl(zatm_dev->base+r*4)
#define zin(r) inl(zatm_dev->base+uPD98401_##r*4)
#define zout(v,r) outl(v,zatm_dev->base+uPD98401_##r*4)
#define zwait while (zin(CMR) & uPD98401_BUSY)

/* RX0, RX1, TX0, TX1 */
static const int mbx_entries[NR_MBX] = { 1024,1024,1024,1024 };
static const int mbx_esize[NR_MBX] = { 16,16,4,4 }; /* entry size in bytes */

#define MBX_SIZE(i) (mbx_entries[i]*mbx_esize[i])


/*-------------------------------- utilities --------------------------------*/


static void zpokel(struct zatm_dev *zatm_dev,u32 value,u32 addr)
{
	zwait;
	zout(value,CER);
	zout(uPD98401_IND_ACC | uPD98401_IA_BALL |
	    (uPD98401_IA_TGT_CM << uPD98401_IA_TGT_SHIFT) | addr,CMR);
}


static u32 zpeekl(struct zatm_dev *zatm_dev,u32 addr)
{
	zwait;
	zout(uPD98401_IND_ACC | uPD98401_IA_BALL | uPD98401_IA_RW |
	  (uPD98401_IA_TGT_CM << uPD98401_IA_TGT_SHIFT) | addr,CMR);
	zwait;
	return zin(CER);
}


/*------------------------------- free lists --------------------------------*/


/*
 * Free buffer head structure:
 *   [0] pointer to buffer (for SAR)
 *   [1] buffer descr link pointer (for SAR)
 *   [2] back pointer to skb (for poll_rx)
 *   [3] data
 *   ...
 */

struct rx_buffer_head {
	u32		buffer;	/* pointer to buffer (for SAR) */
	u32		link;	/* buffer descriptor link pointer (for SAR) */
	struct sk_buff	*skb;	/* back pointer to skb (for poll_rx) */
};


static void refill_pool(struct atm_dev *dev,int pool)
{
	struct zatm_dev *zatm_dev;
	struct sk_buff *skb;
	struct rx_buffer_head *first;
	unsigned long flags;
	int align,offset,free,count,size;

	EVENT("refill_pool\n",0,0);
	zatm_dev = ZATM_DEV(dev);
	size = (64 << (pool <= ZATM_AAL5_POOL_BASE ? 0 :
	    pool-ZATM_AAL5_POOL_BASE))+sizeof(struct rx_buffer_head);
	if (size < PAGE_SIZE) {
		align = 32; /* for 32 byte alignment */
		offset = sizeof(struct rx_buffer_head);
	}
	else {
		align = 4096;
		offset = zatm_dev->pool_info[pool].offset+
		    sizeof(struct rx_buffer_head);
	}
	size += align;
	spin_lock_irqsave(&zatm_dev->lock, flags);
	free = zpeekl(zatm_dev,zatm_dev->pool_base+2*pool) &
	    uPD98401_RXFP_REMAIN;
	spin_unlock_irqrestore(&zatm_dev->lock, flags);
	if (free >= zatm_dev->pool_info[pool].low_water) return;
	EVENT("starting ... POOL: 0x%x, 0x%x\n",
	    zpeekl(zatm_dev,zatm_dev->pool_base+2*pool),
	    zpeekl(zatm_dev,zatm_dev->pool_base+2*pool+1));
	EVENT("dummy: 0x%08lx, 0x%08lx\n",dummy[0],dummy[1]);
	count = 0;
	first = NULL;
	while (free < zatm_dev->pool_info[pool].high_water) {
		struct rx_buffer_head *head;

		skb = alloc_skb(size,GFP_ATOMIC);
		if (!skb) {
			printk(KERN_WARNING DEV_LABEL "(Itf %d): got no new "
			    "skb (%d) with %d free\n",dev->number,size,free);
			break;
		}
		skb_reserve(skb,(unsigned char *) ((((unsigned long) skb->data+
		    align+offset-1) & ~(unsigned long) (align-1))-offset)-
		    skb->data);
		head = (struct rx_buffer_head *) skb->data;
		skb_reserve(skb,sizeof(struct rx_buffer_head));
		if (!first) first = head;
		count++;
		head->buffer = virt_to_bus(skb->data);
		head->link = 0;
		head->skb = skb;
		EVENT("enq skb 0x%08lx/0x%08lx\n",(unsigned long) skb,
		    (unsigned long) head);
		spin_lock_irqsave(&zatm_dev->lock, flags);
		if (zatm_dev->last_free[pool])
			((struct rx_buffer_head *) (zatm_dev->last_free[pool]->
			    data))[-1].link = virt_to_bus(head);
		zatm_dev->last_free[pool] = skb;
		skb_queue_tail(&zatm_dev->pool[pool],skb);
		spin_unlock_irqrestore(&zatm_dev->lock, flags);
		free++;
	}
	if (first) {
		spin_lock_irqsave(&zatm_dev->lock, flags);
		zwait;
		zout(virt_to_bus(first),CER);
		zout(uPD98401_ADD_BAT | (pool << uPD98401_POOL_SHIFT) | count,
		    CMR);
		spin_unlock_irqrestore(&zatm_dev->lock, flags);
		EVENT ("POOL: 0x%x, 0x%x\n",
		    zpeekl(zatm_dev,zatm_dev->pool_base+2*pool),
		    zpeekl(zatm_dev,zatm_dev->pool_base+2*pool+1));
		EVENT("dummy: 0x%08lx, 0x%08lx\n",dummy[0],dummy[1]);
	}
}


static void drain_free(struct atm_dev *dev,int pool)
{
	skb_queue_purge(&ZATM_DEV(dev)->pool[pool]);
}


static int pool_index(int max_pdu)
{
	int i;

	if (max_pdu % ATM_CELL_PAYLOAD)
		printk(KERN_ERR DEV_LABEL ": driver error in pool_index: "
		    "max_pdu is %d\n",max_pdu);
	if (max_pdu > 65536) return -1;
	for (i = 0; (64 << i) < max_pdu; i++);
	return i+ZATM_AAL5_POOL_BASE;
}


/* use_pool isn't reentrant */


static void use_pool(struct atm_dev *dev,int pool)
{
	struct zatm_dev *zatm_dev;
	unsigned long flags;
	int size;

	zatm_dev = ZATM_DEV(dev);
	if (!(zatm_dev->pool_info[pool].ref_count++)) {
		skb_queue_head_init(&zatm_dev->pool[pool]);
		size = pool-ZATM_AAL5_POOL_BASE;
		if (size < 0) size = 0; /* 64B... */
		else if (size > 10) size = 10; /* ... 64kB */
		spin_lock_irqsave(&zatm_dev->lock, flags);
		zpokel(zatm_dev,((zatm_dev->pool_info[pool].low_water/4) <<
		    uPD98401_RXFP_ALERT_SHIFT) |
		    (1 << uPD98401_RXFP_BTSZ_SHIFT) |
		    (size << uPD98401_RXFP_BFSZ_SHIFT),
		    zatm_dev->pool_base+pool*2);
		zpokel(zatm_dev,(unsigned long) dummy,zatm_dev->pool_base+
		    pool*2+1);
		spin_unlock_irqrestore(&zatm_dev->lock, flags);
		zatm_dev->last_free[pool] = NULL;
		refill_pool(dev,pool);
	}
	DPRINTK("pool %d: %d\n",pool,zatm_dev->pool_info[pool].ref_count);
}


static void unuse_pool(struct atm_dev *dev,int pool)
{
	if (!(--ZATM_DEV(dev)->pool_info[pool].ref_count))
		drain_free(dev,pool);
}

/*----------------------------------- RX ------------------------------------*/


#if 0
static void exception(struct atm_vcc *vcc)
{
   static int count = 0;
   struct zatm_dev *zatm_dev = ZATM_DEV(vcc->dev);
   struct zatm_vcc *zatm_vcc = ZATM_VCC(vcc);
   unsigned long *qrp;
   int i;

   if (count++ > 2) return;
   for (i = 0; i < 8; i++)
	printk("TX%d: 0x%08lx\n",i,
	  zpeekl(zatm_dev,zatm_vcc->tx_chan*VC_SIZE/4+i));
   for (i = 0; i < 5; i++)
	printk("SH%d: 0x%08lx\n",i,
	  zpeekl(zatm_dev,uPD98401_IM(zatm_vcc->shaper)+16*i));
   qrp = (unsigned long *) zpeekl(zatm_dev,zatm_vcc->tx_chan*VC_SIZE/4+
     uPD98401_TXVC_QRP);
   printk("qrp=0x%08lx\n",(unsigned long) qrp);
   for (i = 0; i < 4; i++) printk("QRP[%d]: 0x%08lx",i,qrp[i]);
}
#endif


static const char *err_txt[] = {
	"No error",
	"RX buf underflow",
	"RX FIFO overrun",
	"Maximum len violation",
	"CRC error",
	"User abort",
	"Length violation",
	"T1 error",
	"Deactivated",
	"???",
	"???",
	"???",
	"???",
	"???",
	"???",
	"???"
};


static void poll_rx(struct atm_dev *dev,int mbx)
{
	struct zatm_dev *zatm_dev;
	unsigned long pos;
	u32 x;
	int error;

	EVENT("poll_rx\n",0,0);
	zatm_dev = ZATM_DEV(dev);
	pos = (zatm_dev->mbx_start[mbx] & ~0xffffUL) | zin(MTA(mbx));
	while (x = zin(MWA(mbx)), (pos & 0xffff) != x) {
		u32 *here;
		struct sk_buff *skb;
		struct atm_vcc *vcc;
		int cells,size,chan;

		EVENT("MBX: host 0x%lx, nic 0x%x\n",pos,x);
		here = (u32 *) pos;
		if (((pos += 16) & 0xffff) == zatm_dev->mbx_end[mbx])
			pos = zatm_dev->mbx_start[mbx];
		cells = here[0] & uPD98401_AAL5_SIZE;
#if 0
printk("RX IND: 0x%x, 0x%x, 0x%x, 0x%x\n",here[0],here[1],here[2],here[3]);
{
unsigned long *x;
		printk("POOL: 0x%08x, 0x%08x\n",zpeekl(zatm_dev,
		      zatm_dev->pool_base),
		      zpeekl(zatm_dev,zatm_dev->pool_base+1));
		x = (unsigned long *) here[2];
		printk("[0..3] = 0x%08lx, 0x%08lx, 0x%08lx, 0x%08lx\n",
		    x[0],x[1],x[2],x[3]);
}
#endif
		error = 0;
		if (here[3] & uPD98401_AAL5_ERR) {
			error = (here[3] & uPD98401_AAL5_ES) >>
			    uPD98401_AAL5_ES_SHIFT;
			if (error == uPD98401_AAL5_ES_DEACT ||
			    error == uPD98401_AAL5_ES_FREE) continue;
		}
EVENT("error code 0x%x/0x%x\n",(here[3] & uPD98401_AAL5_ES) >>
  uPD98401_AAL5_ES_SHIFT,error);
		skb = ((struct rx_buffer_head *) bus_to_virt(here[2]))->skb;
		__net_timestamp(skb);
#if 0
printk("[-3..0] 0x%08lx 0x%08lx 0x%08lx 0x%08lx\n",((unsigned *) skb->data)[-3],
  ((unsigned *) skb->data)[-2],((unsigned *) skb->data)[-1],
  ((unsigned *) skb->data)[0]);
#endif
		EVENT("skb 0x%lx, here 0x%lx\n",(unsigned long) skb,
		    (unsigned long) here);
#if 0
printk("dummy: 0x%08lx, 0x%08lx\n",dummy[0],dummy[1]);
#endif
		size = error ? 0 : ntohs(((__be16 *) skb->data)[cells*
		    ATM_CELL_PAYLOAD/sizeof(u16)-3]);
		EVENT("got skb 0x%lx, size %d\n",(unsigned long) skb,size);
		chan = (here[3] & uPD98401_AAL5_CHAN) >>
		    uPD98401_AAL5_CHAN_SHIFT;
		if (chan < zatm_dev->chans && zatm_dev->rx_map[chan]) {
			int pos;
			vcc = zatm_dev->rx_map[chan];
			pos = ZATM_VCC(vcc)->pool;
			if (skb == zatm_dev->last_free[pos])
				zatm_dev->last_free[pos] = NULL;
			skb_unlink(skb, zatm_dev->pool + pos);
		}
		else {
			printk(KERN_ERR DEV_LABEL "(itf %d): RX indication "
			    "for non-existing channel\n",dev->number);
			size = 0;
			vcc = NULL;
			event_dump();
		}
		if (error) {
			static unsigned long silence = 0;
			static int last_error = 0;

			if (error != last_error ||
			    time_after(jiffies, silence)  || silence == 0){
				printk(KERN_WARNING DEV_LABEL "(itf %d): "
				    "chan %d error %s\n",dev->number,chan,
				    err_txt[error]);
				last_error = error;
				silence = (jiffies+2*HZ)|1;
			}
			size = 0;
		}
		if (size && (size > cells*ATM_CELL_PAYLOAD-ATM_AAL5_TRAILER ||
		    size <= (cells-1)*ATM_CELL_PAYLOAD-ATM_AAL5_TRAILER)) {
			printk(KERN_ERR DEV_LABEL "(itf %d): size %d with %d "
			    "cells\n",dev->number,size,cells);
			size = 0;
			event_dump();
		}
		if (size > ATM_MAX_AAL5_PDU) {
			printk(KERN_ERR DEV_LABEL "(itf %d): size too big "
			    "(%d)\n",dev->number,size);
			size = 0;
			event_dump();
		}
		if (!size) {
			dev_kfree_skb_irq(skb);
			if (vcc) atomic_inc(&vcc->stats->rx_err);
			continue;
		}
		if (!atm_charge(vcc,skb->truesize)) {
			dev_kfree_skb_irq(skb);
			continue;
		}
		skb->len = size;
		ATM_SKB(skb)->vcc = vcc;
		vcc->push(vcc,skb);
		atomic_inc(&vcc->stats->rx);
	}
	zout(pos & 0xffff,MTA(mbx));
#if 0 /* probably a stupid idea */
	refill_pool(dev,zatm_vcc->pool);
		/* maybe this saves us a few interrupts */
#endif
}


static int open_rx_first(struct atm_vcc *vcc)
{
	struct zatm_dev *zatm_dev;
	struct zatm_vcc *zatm_vcc;
	unsigned long flags;
	unsigned short chan;
	int cells;

	DPRINTK("open_rx_first (0x%x)\n",inb_p(0xc053));
	zatm_dev = ZATM_DEV(vcc->dev);
	zatm_vcc = ZATM_VCC(vcc);
	zatm_vcc->rx_chan = 0;
	if (vcc->qos.rxtp.traffic_class == ATM_NONE) return 0;
	if (vcc->qos.aal == ATM_AAL5) {
		if (vcc->qos.rxtp.max_sdu > 65464)
			vcc->qos.rxtp.max_sdu = 65464;
			/* fix this - we may want to receive 64kB SDUs
			   later */
		cells = (vcc->qos.rxtp.max_sdu+ATM_AAL5_TRAILER+
		    ATM_CELL_PAYLOAD-1)/ATM_CELL_PAYLOAD;
		zatm_vcc->pool = pool_index(cells*ATM_CELL_PAYLOAD);
	}
	else {
		cells = 1;
		zatm_vcc->pool = ZATM_AAL0_POOL;
	}
	if (zatm_vcc->pool < 0) return -EMSGSIZE;
	spin_lock_irqsave(&zatm_dev->lock, flags);
	zwait;
	zout(uPD98401_OPEN_CHAN,CMR);
	zwait;
	DPRINTK("0x%x 0x%x\n",zin(CMR),zin(CER));
	chan = (zin(CMR) & uPD98401_CHAN_ADDR) >> uPD98401_CHAN_ADDR_SHIFT;
	spin_unlock_irqrestore(&zatm_dev->lock, flags);
	DPRINTK("chan is %d\n",chan);
	if (!chan) return -EAGAIN;
	use_pool(vcc->dev,zatm_vcc->pool);
	DPRINTK("pool %d\n",zatm_vcc->pool);
	/* set up VC descriptor */
	spin_lock_irqsave(&zatm_dev->lock, flags);
	zpokel(zatm_dev,zatm_vcc->pool << uPD98401_RXVC_POOL_SHIFT,
	    chan*VC_SIZE/4);
	zpokel(zatm_dev,uPD98401_RXVC_OD | (vcc->qos.aal == ATM_AAL5 ?
	    uPD98401_RXVC_AR : 0) | cells,chan*VC_SIZE/4+1);
	zpokel(zatm_dev,0,chan*VC_SIZE/4+2);
	zatm_vcc->rx_chan = chan;
	zatm_dev->rx_map[chan] = vcc;
	spin_unlock_irqrestore(&zatm_dev->lock, flags);
	return 0;
}


static int open_rx_second(struct atm_vcc *vcc)
{
	struct zatm_dev *zatm_dev;
	struct zatm_vcc *zatm_vcc;
	unsigned long flags;
	int pos,shift;

	DPRINTK("open_rx_second (0x%x)\n",inb_p(0xc053));
	zatm_dev = ZATM_DEV(vcc->dev);
	zatm_vcc = ZATM_VCC(vcc);
	if (!zatm_vcc->rx_chan) return 0;
	spin_lock_irqsave(&zatm_dev->lock, flags);
	/* should also handle VPI @@@ */
	pos = vcc->vci >> 1;
	shift = (1-(vcc->vci & 1)) << 4;
	zpokel(zatm_dev,(zpeekl(zatm_dev,pos) & ~(0xffff << shift)) |
	    ((zatm_vcc->rx_chan | uPD98401_RXLT_ENBL) << shift),pos);
	spin_unlock_irqrestore(&zatm_dev->lock, flags);
	return 0;
}


static void close_rx(struct atm_vcc *vcc)
{
	struct zatm_dev *zatm_dev;
	struct zatm_vcc *zatm_vcc;
	unsigned long flags;
	int pos,shift;

	zatm_vcc = ZATM_VCC(vcc);
	zatm_dev = ZATM_DEV(vcc->dev);
	if (!zatm_vcc->rx_chan) return;
	DPRINTK("close_rx\n");
	/* disable receiver */
	if (vcc->vpi != ATM_VPI_UNSPEC && vcc->vci != ATM_VCI_UNSPEC) {
		spin_lock_irqsave(&zatm_dev->lock, flags);
		pos = vcc->vci >> 1;
		shift = (1-(vcc->vci & 1)) << 4;
		zpokel(zatm_dev,zpeekl(zatm_dev,pos) & ~(0xffff << shift),pos);
		zwait;
		zout(uPD98401_NOP,CMR);
		zwait;
		zout(uPD98401_NOP,CMR);
		spin_unlock_irqrestore(&zatm_dev->lock, flags);
	}
	spin_lock_irqsave(&zatm_dev->lock, flags);
	zwait;
	zout(uPD98401_DEACT_CHAN | uPD98401_CHAN_RT | (zatm_vcc->rx_chan <<
	    uPD98401_CHAN_ADDR_SHIFT),CMR);
	zwait;
	udelay(10); /* why oh why ... ? */
	zout(uPD98401_CLOSE_CHAN | uPD98401_CHAN_RT | (zatm_vcc->rx_chan <<
	    uPD98401_CHAN_ADDR_SHIFT),CMR);
	zwait;
	if (!(zin(CMR) & uPD98401_CHAN_ADDR))
		printk(KERN_CRIT DEV_LABEL "(itf %d): can't close RX channel "
		    "%d\n",vcc->dev->number,zatm_vcc->rx_chan);
	spin_unlock_irqrestore(&zatm_dev->lock, flags);
	zatm_dev->rx_map[zatm_vcc->rx_chan] = NULL;
	zatm_vcc->rx_chan = 0;
	unuse_pool(vcc->dev,zatm_vcc->pool);
}


static int start_rx(struct atm_dev *dev)
{
	struct zatm_dev *zatm_dev;
	int size,i;

DPRINTK("start_rx\n");
	zatm_dev = ZATM_DEV(dev);
	size = sizeof(struct atm_vcc *)*zatm_dev->chans;
	zatm_dev->rx_map = (struct atm_vcc **) kmalloc(size,GFP_KERNEL);
	if (!zatm_dev->rx_map) return -ENOMEM;
	memset(zatm_dev->rx_map,0,size);
	/* set VPI/VCI split (use all VCIs and give what's left to VPIs) */
	zpokel(zatm_dev,(1 << dev->ci_range.vci_bits)-1,uPD98401_VRR);
	/* prepare free buffer pools */
	for (i = 0; i <= ZATM_LAST_POOL; i++) {
		zatm_dev->pool_info[i].ref_count = 0;
		zatm_dev->pool_info[i].rqa_count = 0;
		zatm_dev->pool_info[i].rqu_count = 0;
		zatm_dev->pool_info[i].low_water = LOW_MARK;
		zatm_dev->pool_info[i].high_water = HIGH_MARK;
		zatm_dev->pool_info[i].offset = 0;
		zatm_dev->pool_info[i].next_off = 0;
		zatm_dev->pool_info[i].next_cnt = 0;
		zatm_dev->pool_info[i].next_thres = OFF_CNG_THRES;
	}
	return 0;
}


/*----------------------------------- TX ------------------------------------*/


static int do_tx(struct sk_buff *skb)
{
	struct atm_vcc *vcc;
	struct zatm_dev *zatm_dev;
	struct zatm_vcc *zatm_vcc;
	u32 *dsc;
	unsigned long flags;

	EVENT("do_tx\n",0,0);
	DPRINTK("sending skb %p\n",skb);
	vcc = ATM_SKB(skb)->vcc;
	zatm_dev = ZATM_DEV(vcc->dev);
	zatm_vcc = ZATM_VCC(vcc);
	EVENT("iovcnt=%d\n",skb_shinfo(skb)->nr_frags,0);
	spin_lock_irqsave(&zatm_dev->lock, flags);
	if (!skb_shinfo(skb)->nr_frags) {
		if (zatm_vcc->txing == RING_ENTRIES-1) {
			spin_unlock_irqrestore(&zatm_dev->lock, flags);
			return RING_BUSY;
		}
		zatm_vcc->txing++;
		dsc = zatm_vcc->ring+zatm_vcc->ring_curr;
		zatm_vcc->ring_curr = (zatm_vcc->ring_curr+RING_WORDS) &
		    (RING_ENTRIES*RING_WORDS-1);
		dsc[1] = 0;
		dsc[2] = skb->len;
		dsc[3] = virt_to_bus(skb->data);
		mb();
		dsc[0] = uPD98401_TXPD_V | uPD98401_TXPD_DP | uPD98401_TXPD_SM
		    | (vcc->qos.aal == ATM_AAL5 ? uPD98401_TXPD_AAL5 : 0 |
		    (ATM_SKB(skb)->atm_options & ATM_ATMOPT_CLP ?
		    uPD98401_CLPM_1 : uPD98401_CLPM_0));
		EVENT("dsc (0x%lx)\n",(unsigned long) dsc,0);
	}
	else {
printk("NONONONOO!!!!\n");
		dsc = NULL;
#if 0
		u32 *put;
		int i;

		dsc = (u32 *) kmalloc(uPD98401_TXPD_SIZE*2+
		    uPD98401_TXBD_SIZE*ATM_SKB(skb)->iovcnt,GFP_ATOMIC);
		if (!dsc) {
			if (vcc->pop) vcc->pop(vcc,skb);
			else dev_kfree_skb_irq(skb);
			return -EAGAIN;
		}
		/* @@@ should check alignment */
		put = dsc+8;
		dsc[0] = uPD98401_TXPD_V | uPD98401_TXPD_DP |
		    (vcc->aal == ATM_AAL5 ? uPD98401_TXPD_AAL5 : 0 |
		    (ATM_SKB(skb)->atm_options & ATM_ATMOPT_CLP ?
		    uPD98401_CLPM_1 : uPD98401_CLPM_0));
		dsc[1] = 0;
		dsc[2] = ATM_SKB(skb)->iovcnt*uPD98401_TXBD_SIZE;
		dsc[3] = virt_to_bus(put);
		for (i = 0; i < ATM_SKB(skb)->iovcnt; i++) {
			*put++ = ((struct iovec *) skb->data)[i].iov_len;
			*put++ = virt_to_bus(((struct iovec *)
			    skb->data)[i].iov_base);
		}
		put[-2] |= uPD98401_TXBD_LAST;
#endif
	}
	ZATM_PRV_DSC(skb) = dsc;
	skb_queue_tail(&zatm_vcc->tx_queue,skb);
	DPRINTK("QRP=0x%08lx\n",zpeekl(zatm_dev,zatm_vcc->tx_chan*VC_SIZE/4+
	  uPD98401_TXVC_QRP));
	zwait;
	zout(uPD98401_TX_READY | (zatm_vcc->tx_chan <<
	    uPD98401_CHAN_ADDR_SHIFT),CMR);
	spin_unlock_irqrestore(&zatm_dev->lock, flags);
	EVENT("done\n",0,0);
	return 0;
}


static inline void dequeue_tx(struct atm_vcc *vcc)
{
	struct zatm_vcc *zatm_vcc;
	struct sk_buff *skb;

	EVENT("dequeue_tx\n",0,0);
	zatm_vcc = ZATM_VCC(vcc);
	skb = skb_dequeue(&zatm_vcc->tx_queue);
	if (!skb) {
		printk(KERN_CRIT DEV_LABEL "(itf %d): dequeue_tx but not "
		    "txing\n",vcc->dev->number);
		return;
	}
#if 0 /* @@@ would fail on CLP */
if (*ZATM_PRV_DSC(skb) != (uPD98401_TXPD_V | uPD98401_TXPD_DP |
  uPD98401_TXPD_SM | uPD98401_TXPD_AAL5)) printk("@#*$!!!!  (%08x)\n",
  *ZATM_PRV_DSC(skb));
#endif
	*ZATM_PRV_DSC(skb) = 0; /* mark as invalid */
	zatm_vcc->txing--;
	if (vcc->pop) vcc->pop(vcc,skb);
	else dev_kfree_skb_irq(skb);
	while ((skb = skb_dequeue(&zatm_vcc->backlog)))
		if (do_tx(skb) == RING_BUSY) {
			skb_queue_head(&zatm_vcc->backlog,skb);
			break;
		}
	atomic_inc(&vcc->stats->tx);
	wake_up(&zatm_vcc->tx_wait);
}


static void poll_tx(struct atm_dev *dev,int mbx)
{
	struct zatm_dev *zatm_dev;
	unsigned long pos;
	u32 x;

	EVENT("poll_tx\n",0,0);
	zatm_dev = ZATM_DEV(dev);
	pos = (zatm_dev->mbx_start[mbx] & ~0xffffUL) | zin(MTA(mbx));
	while (x = zin(MWA(mbx)), (pos & 0xffff) != x) {
		int chan;

#if 1
		u32 data,*addr;

		EVENT("MBX: host 0x%lx, nic 0x%x\n",pos,x);
		addr = (u32 *) pos;
		data = *addr;
		chan = (data & uPD98401_TXI_CONN) >> uPD98401_TXI_CONN_SHIFT;
		EVENT("addr = 0x%lx, data = 0x%08x,",(unsigned long) addr,
		    data);
		EVENT("chan = %d\n",chan,0);
#else
NO !
		chan = (zatm_dev->mbx_start[mbx][pos >> 2] & uPD98401_TXI_CONN)
		>> uPD98401_TXI_CONN_SHIFT;
#endif
		if (chan < zatm_dev->chans && zatm_dev->tx_map[chan])
			dequeue_tx(zatm_dev->tx_map[chan]);
		else {
			printk(KERN_CRIT DEV_LABEL "(itf %d): TX indication "
			    "for non-existing channel %d\n",dev->number,chan);
			event_dump();
		}
		if (((pos += 4) & 0xffff) == zatm_dev->mbx_end[mbx])
			pos = zatm_dev->mbx_start[mbx];
	}
	zout(pos & 0xffff,MTA(mbx));
}


/*
 * BUG BUG BUG: Doesn't handle "new-style" rate specification yet.
 */

static int alloc_shaper(struct atm_dev *dev,int *pcr,int min,int max,int ubr)
{
	struct zatm_dev *zatm_dev;
	unsigned long flags;
	unsigned long i,m,c;
	int shaper;

	DPRINTK("alloc_shaper (min = %d, max = %d)\n",min,max);
	zatm_dev = ZATM_DEV(dev);
	if (!zatm_dev->free_shapers) return -EAGAIN;
	for (shaper = 0; !((zatm_dev->free_shapers >> shaper) & 1); shaper++);
	zatm_dev->free_shapers &= ~1 << shaper;
	if (ubr) {
		c = 5;
		i = m = 1;
		zatm_dev->ubr_ref_cnt++;
		zatm_dev->ubr = shaper;
	}
	else {
		if (min) {
			if (min <= 255) {
				i = min;
				m = ATM_OC3_PCR;
			}
			else {
				i = 255;
				m = ATM_OC3_PCR*255/min;
			}
		}
		else {
			if (max > zatm_dev->tx_bw) max = zatm_dev->tx_bw;
			if (max <= 255) {
				i = max;
				m = ATM_OC3_PCR;
			}
			else {
				i = 255;
				m = (ATM_OC3_PCR*255+max-1)/max;
			}
		}
		if (i > m) {
			printk(KERN_CRIT DEV_LABEL "shaper algorithm botched "
			    "[%d,%d] -> i=%ld,m=%ld\n",min,max,i,m);
			m = i;
		}
		*pcr = i*ATM_OC3_PCR/m;
		c = 20; /* @@@ should use max_cdv ! */
		if ((min && *pcr < min) || (max && *pcr > max)) return -EINVAL;
		if (zatm_dev->tx_bw < *pcr) return -EAGAIN;
		zatm_dev->tx_bw -= *pcr;
	}
	spin_lock_irqsave(&zatm_dev->lock, flags);
	DPRINTK("i = %d, m = %d, PCR = %d\n",i,m,*pcr);
	zpokel(zatm_dev,(i << uPD98401_IM_I_SHIFT) | m,uPD98401_IM(shaper));
	zpokel(zatm_dev,c << uPD98401_PC_C_SHIFT,uPD98401_PC(shaper));
	zpokel(zatm_dev,0,uPD98401_X(shaper));
	zpokel(zatm_dev,0,uPD98401_Y(shaper));
	zpokel(zatm_dev,uPD98401_PS_E,uPD98401_PS(shaper));
	spin_unlock_irqrestore(&zatm_dev->lock, flags);
	return shaper;
}


static void dealloc_shaper(struct atm_dev *dev,int shaper)
{
	struct zatm_dev *zatm_dev;
	unsigned long flags;

	zatm_dev = ZATM_DEV(dev);
	if (shaper == zatm_dev->ubr) {
		if (--zatm_dev->ubr_ref_cnt) return;
		zatm_dev->ubr = -1;
	}
	spin_lock_irqsave(&zatm_dev->lock, flags);
	zpokel(zatm_dev,zpeekl(zatm_dev,uPD98401_PS(shaper)) & ~uPD98401_PS_E,
	    uPD98401_PS(shaper));
	spin_unlock_irqrestore(&zatm_dev->lock, flags);
	zatm_dev->free_shapers |= 1 << shaper;
}


static void close_tx(struct atm_vcc *vcc)
{
	struct zatm_dev *zatm_dev;
	struct zatm_vcc *zatm_vcc;
	unsigned long flags;
	int chan;

	zatm_vcc = ZATM_VCC(vcc);
	zatm_dev = ZATM_DEV(vcc->dev);
	chan = zatm_vcc->tx_chan;
	if (!chan) return;
	DPRINTK("close_tx\n");
	if (skb_peek(&zatm_vcc->backlog)) {
		printk("waiting for backlog to drain ...\n");
		event_dump();
		wait_event(zatm_vcc->tx_wait, !skb_peek(&zatm_vcc->backlog));
	}
	if (skb_peek(&zatm_vcc->tx_queue)) {
		printk("waiting for TX queue to drain ...\n");
		event_dump();
		wait_event(zatm_vcc->tx_wait, !skb_peek(&zatm_vcc->tx_queue));
	}
	spin_lock_irqsave(&zatm_dev->lock, flags);
#if 0
	zwait;
	zout(uPD98401_DEACT_CHAN | (chan << uPD98401_CHAN_ADDR_SHIFT),CMR);
#endif
	zwait;
	zout(uPD98401_CLOSE_CHAN | (chan << uPD98401_CHAN_ADDR_SHIFT),CMR);
	zwait;
	if (!(zin(CMR) & uPD98401_CHAN_ADDR))
		printk(KERN_CRIT DEV_LABEL "(itf %d): can't close TX channel "
		    "%d\n",vcc->dev->number,chan);
	spin_unlock_irqrestore(&zatm_dev->lock, flags);
	zatm_vcc->tx_chan = 0;
	zatm_dev->tx_map[chan] = NULL;
	if (zatm_vcc->shaper != zatm_dev->ubr) {
		zatm_dev->tx_bw += vcc->qos.txtp.min_pcr;
		dealloc_shaper(vcc->dev,zatm_vcc->shaper);
	}
	kfree(zatm_vcc->ring);
}


static int open_tx_first(struct atm_vcc *vcc)
{
	struct zatm_dev *zatm_dev;
	struct zatm_vcc *zatm_vcc;
	unsigned long flags;
	u32 *loop;
	unsigned short chan;
	int pcr,unlimited;

	DPRINTK("open_tx_first\n");
	zatm_dev = ZATM_DEV(vcc->dev);
	zatm_vcc = ZATM_VCC(vcc);
	zatm_vcc->tx_chan = 0;
	if (vcc->qos.txtp.traffic_class == ATM_NONE) return 0;
	spin_lock_irqsave(&zatm_dev->lock, flags);
	zwait;
	zout(uPD98401_OPEN_CHAN,CMR);
	zwait;
	DPRINTK("0x%x 0x%x\n",zin(CMR),zin(CER));
	chan = (zin(CMR) & uPD98401_CHAN_ADDR) >> uPD98401_CHAN_ADDR_SHIFT;
	spin_unlock_irqrestore(&zatm_dev->lock, flags);
	DPRINTK("chan is %d\n",chan);
	if (!chan) return -EAGAIN;
	unlimited = vcc->qos.txtp.traffic_class == ATM_UBR &&
	    (!vcc->qos.txtp.max_pcr || vcc->qos.txtp.max_pcr == ATM_MAX_PCR ||
	    vcc->qos.txtp.max_pcr >= ATM_OC3_PCR);
	if (unlimited && zatm_dev->ubr != -1) zatm_vcc->shaper = zatm_dev->ubr;
	else {
		if (unlimited) vcc->qos.txtp.max_sdu = ATM_MAX_AAL5_PDU;
		if ((zatm_vcc->shaper = alloc_shaper(vcc->dev,&pcr,
		    vcc->qos.txtp.min_pcr,vcc->qos.txtp.max_pcr,unlimited))
		    < 0) {
			close_tx(vcc);
			return zatm_vcc->shaper;
		}
		if (pcr > ATM_OC3_PCR) pcr = ATM_OC3_PCR;
		vcc->qos.txtp.min_pcr = vcc->qos.txtp.max_pcr = pcr;
	}
	zatm_vcc->tx_chan = chan;
	skb_queue_head_init(&zatm_vcc->tx_queue);
	init_waitqueue_head(&zatm_vcc->tx_wait);
	/* initialize ring */
	zatm_vcc->ring = kmalloc(RING_SIZE,GFP_KERNEL);
	if (!zatm_vcc->ring) return -ENOMEM;
	memset(zatm_vcc->ring,0,RING_SIZE);
	loop = zatm_vcc->ring+RING_ENTRIES*RING_WORDS;
	loop[0] = uPD98401_TXPD_V;
	loop[1] = loop[2] = 0;
	loop[3] = virt_to_bus(zatm_vcc->ring);
	zatm_vcc->ring_curr = 0;
	zatm_vcc->txing = 0;
	skb_queue_head_init(&zatm_vcc->backlog);
	zpokel(zatm_dev,virt_to_bus(zatm_vcc->ring),
	    chan*VC_SIZE/4+uPD98401_TXVC_QRP);
	return 0;
}


static int open_tx_second(struct atm_vcc *vcc)
{
	struct zatm_dev *zatm_dev;
	struct zatm_vcc *zatm_vcc;
	unsigned long flags;

	DPRINTK("open_tx_second\n");
	zatm_dev = ZATM_DEV(vcc->dev);
	zatm_vcc = ZATM_VCC(vcc);
	if (!zatm_vcc->tx_chan) return 0;
	/* set up VC descriptor */
	spin_lock_irqsave(&zatm_dev->lock, flags);
	zpokel(zatm_dev,0,zatm_vcc->tx_chan*VC_SIZE/4);
	zpokel(zatm_dev,uPD98401_TXVC_L | (zatm_vcc->shaper <<
	    uPD98401_TXVC_SHP_SHIFT) | (vcc->vpi << uPD98401_TXVC_VPI_SHIFT) |
	    vcc->vci,zatm_vcc->tx_chan*VC_SIZE/4+1);
	zpokel(zatm_dev,0,zatm_vcc->tx_chan*VC_SIZE/4+2);
	spin_unlock_irqrestore(&zatm_dev->lock, flags);
	zatm_dev->tx_map[zatm_vcc->tx_chan] = vcc;
	return 0;
}


static int start_tx(struct atm_dev *dev)
{
	struct zatm_dev *zatm_dev;
	int i;

	DPRINTK("start_tx\n");
	zatm_dev = ZATM_DEV(dev);
	zatm_dev->tx_map = (struct atm_vcc **) kmalloc(sizeof(struct atm_vcc *)*
	    zatm_dev->chans,GFP_KERNEL);
	if (!zatm_dev->tx_map) return -ENOMEM;
	zatm_dev->tx_bw = ATM_OC3_PCR;
	zatm_dev->free_shapers = (1 << NR_SHAPERS)-1;
	zatm_dev->ubr = -1;
	zatm_dev->ubr_ref_cnt = 0;
	/* initialize shapers */
	for (i = 0; i < NR_SHAPERS; i++) zpokel(zatm_dev,0,uPD98401_PS(i));
	return 0;
}


/*------------------------------- interrupts --------------------------------*/


static irqreturn_t zatm_int(int irq,void *dev_id,struct pt_regs *regs)
{
	struct atm_dev *dev;
	struct zatm_dev *zatm_dev;
	u32 reason;
	int handled = 0;

	dev = dev_id;
	zatm_dev = ZATM_DEV(dev);
	while ((reason = zin(GSR))) {
		handled = 1;
		EVENT("reason 0x%x\n",reason,0);
		if (reason & uPD98401_INT_PI) {
			EVENT("PHY int\n",0,0);
			dev->phy->interrupt(dev);
		}
		if (reason & uPD98401_INT_RQA) {
			unsigned long pools;
			int i;

			pools = zin(RQA);
			EVENT("RQA (0x%08x)\n",pools,0);
			for (i = 0; pools; i++) {
				if (pools & 1) {
					refill_pool(dev,i);
					zatm_dev->pool_info[i].rqa_count++;
				}
				pools >>= 1;
			}
		}
		if (reason & uPD98401_INT_RQU) {
			unsigned long pools;
			int i;
			pools = zin(RQU);
			printk(KERN_WARNING DEV_LABEL "(itf %d): RQU 0x%08lx\n",
			    dev->number,pools);
			event_dump();
			for (i = 0; pools; i++) {
				if (pools & 1) {
					refill_pool(dev,i);
					zatm_dev->pool_info[i].rqu_count++;
				}
				pools >>= 1;
			}
		}
		/* don't handle RD */
		if (reason & uPD98401_INT_SPE)
			printk(KERN_ALERT DEV_LABEL "(itf %d): system parity "
			    "error at 0x%08x\n",dev->number,zin(ADDR));
		if (reason & uPD98401_INT_CPE)
			printk(KERN_ALERT DEV_LABEL "(itf %d): control memory "
			    "parity error at 0x%08x\n",dev->number,zin(ADDR));
		if (reason & uPD98401_INT_SBE) {
			printk(KERN_ALERT DEV_LABEL "(itf %d): system bus "
			    "error at 0x%08x\n",dev->number,zin(ADDR));
			event_dump();
		}
		/* don't handle IND */
		if (reason & uPD98401_INT_MF) {
			printk(KERN_CRIT DEV_LABEL "(itf %d): mailbox full "
			    "(0x%x)\n",dev->number,(reason & uPD98401_INT_MF)
			    >> uPD98401_INT_MF_SHIFT);
			event_dump();
			    /* @@@ should try to recover */
		}
		if (reason & uPD98401_INT_MM) {
			if (reason & 1) poll_rx(dev,0);
			if (reason & 2) poll_rx(dev,1);
			if (reason & 4) poll_tx(dev,2);
			if (reason & 8) poll_tx(dev,3);
		}
		/* @@@ handle RCRn */
	}
	return IRQ_RETVAL(handled);
}


/*----------------------------- (E)EPROM access -----------------------------*/


static void __devinit eprom_set(struct zatm_dev *zatm_dev,unsigned long value,
    unsigned short cmd)
{
	int error;

	if ((error = pci_write_config_dword(zatm_dev->pci_dev,cmd,value)))
		printk(KERN_ERR DEV_LABEL ": PCI write failed (0x%02x)\n",
		    error);
}


static unsigned long __devinit eprom_get(struct zatm_dev *zatm_dev,
    unsigned short cmd)
{
	unsigned int value;
	int error;

	if ((error = pci_read_config_dword(zatm_dev->pci_dev,cmd,&value)))
		printk(KERN_ERR DEV_LABEL ": PCI read failed (0x%02x)\n",
		    error);
	return value;
}


static void __devinit eprom_put_bits(struct zatm_dev *zatm_dev,
    unsigned long data,int bits,unsigned short cmd)
{
	unsigned long value;
	int i;

	for (i = bits-1; i >= 0; i--) {
		value = ZEPROM_CS | (((data >> i) & 1) ? ZEPROM_DI : 0);
		eprom_set(zatm_dev,value,cmd);
		eprom_set(zatm_dev,value | ZEPROM_SK,cmd);
		eprom_set(zatm_dev,value,cmd);
	}
}


static void __devinit eprom_get_byte(struct zatm_dev *zatm_dev,
    unsigned char *byte,unsigned short cmd)
{
	int i;

	*byte = 0;
	for (i = 8; i; i--) {
		eprom_set(zatm_dev,ZEPROM_CS,cmd);
		eprom_set(zatm_dev,ZEPROM_CS | ZEPROM_SK,cmd);
		*byte <<= 1;
		if (eprom_get(zatm_dev,cmd) & ZEPROM_DO) *byte |= 1;
		eprom_set(zatm_dev,ZEPROM_CS,cmd);
	}
}


static unsigned char __devinit eprom_try_esi(struct atm_dev *dev,
    unsigned short cmd,int offset,int swap)
{
	unsigned char buf[ZEPROM_SIZE];
	struct zatm_dev *zatm_dev;
	int i;

	zatm_dev = ZATM_DEV(dev);
	for (i = 0; i < ZEPROM_SIZE; i += 2) {
		eprom_set(zatm_dev,ZEPROM_CS,cmd); /* select EPROM */
		eprom_put_bits(zatm_dev,ZEPROM_CMD_READ,ZEPROM_CMD_LEN,cmd);
		eprom_put_bits(zatm_dev,i >> 1,ZEPROM_ADDR_LEN,cmd);
		eprom_get_byte(zatm_dev,buf+i+swap,cmd);
		eprom_get_byte(zatm_dev,buf+i+1-swap,cmd);
		eprom_set(zatm_dev,0,cmd); /* deselect EPROM */
	}
	memcpy(dev->esi,buf+offset,ESI_LEN);
	return memcmp(dev->esi,"\0\0\0\0\0",ESI_LEN); /* assumes ESI_LEN == 6 */
}


static void __devinit eprom_get_esi(struct atm_dev *dev)
{
	if (eprom_try_esi(dev,ZEPROM_V1_REG,ZEPROM_V1_ESI_OFF,1)) return;
	(void) eprom_try_esi(dev,ZEPROM_V2_REG,ZEPROM_V2_ESI_OFF,0);
}


/*--------------------------------- entries ---------------------------------*/


static int __init zatm_init(struct atm_dev *dev)
{
	struct zatm_dev *zatm_dev;
	struct pci_dev *pci_dev;
	unsigned short command;
	unsigned char revision;
	int error,i,last;
	unsigned long t0,t1,t2;

	DPRINTK(">zatm_init\n");
	zatm_dev = ZATM_DEV(dev);
	spin_lock_init(&zatm_dev->lock);
	pci_dev = zatm_dev->pci_dev;
	zatm_dev->base = pci_resource_start(pci_dev, 0);
	zatm_dev->irq = pci_dev->irq;
	if ((error = pci_read_config_word(pci_dev,PCI_COMMAND,&command)) ||
	    (error = pci_read_config_byte(pci_dev,PCI_REVISION_ID,&revision))) {
		printk(KERN_ERR DEV_LABEL "(itf %d): init error 0x%02x\n",
		    dev->number,error);
		return -EINVAL;
	}
	if ((error = pci_write_config_word(pci_dev,PCI_COMMAND,
	    command | PCI_COMMAND_IO | PCI_COMMAND_MASTER))) {
		printk(KERN_ERR DEV_LABEL "(itf %d): can't enable IO (0x%02x)"
		    "\n",dev->number,error);
		return -EIO;
	}
	eprom_get_esi(dev);
	printk(KERN_NOTICE DEV_LABEL "(itf %d): rev.%d,base=0x%x,irq=%d,",
	    dev->number,revision,zatm_dev->base,zatm_dev->irq);
	/* reset uPD98401 */
	zout(0,SWR);
	while (!(zin(GSR) & uPD98401_INT_IND));
	zout(uPD98401_GMR_ONE /*uPD98401_BURST4*/,GMR);
	last = MAX_CRAM_SIZE;
	for (i = last-RAM_INCREMENT; i >= 0; i -= RAM_INCREMENT) {
		zpokel(zatm_dev,0x55555555,i);
		if (zpeekl(zatm_dev,i) != 0x55555555) last = i;
		else {
			zpokel(zatm_dev,0xAAAAAAAA,i);
			if (zpeekl(zatm_dev,i) != 0xAAAAAAAA) last = i;
			else zpokel(zatm_dev,i,i);
		}
	}
	for (i = 0; i < last; i += RAM_INCREMENT)
		if (zpeekl(zatm_dev,i) != i) break;
	zatm_dev->mem = i << 2;
	while (i) zpokel(zatm_dev,0,--i);
	/* reset again to rebuild memory pointers */
	zout(0,SWR);
	while (!(zin(GSR) & uPD98401_INT_IND));
	zout(uPD98401_GMR_ONE | uPD98401_BURST8 | uPD98401_BURST4 |
	    uPD98401_BURST2 | uPD98401_GMR_PM | uPD98401_GMR_DR,GMR);
	/* TODO: should shrink allocation now */
	printk("mem=%dkB,%s (",zatm_dev->mem >> 10,zatm_dev->copper ? "UTP" :
	    "MMF");
	for (i = 0; i < ESI_LEN; i++)
		printk("%02X%s",dev->esi[i],i == ESI_LEN-1 ? ")\n" : "-");
	do {
		unsigned long flags;

		spin_lock_irqsave(&zatm_dev->lock, flags);
		t0 = zpeekl(zatm_dev,uPD98401_TSR);
		udelay(10);
		t1 = zpeekl(zatm_dev,uPD98401_TSR);
		udelay(1010);
		t2 = zpeekl(zatm_dev,uPD98401_TSR);
		spin_unlock_irqrestore(&zatm_dev->lock, flags);
	}
	while (t0 > t1 || t1 > t2); /* loop if wrapping ... */
	zatm_dev->khz = t2-2*t1+t0;
	printk(KERN_NOTICE DEV_LABEL "(itf %d): uPD98401 %d.%d at %d.%03d "
	    "MHz\n",dev->number,
	    (zin(VER) & uPD98401_MAJOR) >> uPD98401_MAJOR_SHIFT,
            zin(VER) & uPD98401_MINOR,zatm_dev->khz/1000,zatm_dev->khz % 1000);
	return uPD98402_init(dev);
}


static int __init zatm_start(struct atm_dev *dev)
{
	struct zatm_dev *zatm_dev = ZATM_DEV(dev);
	struct pci_dev *pdev = zatm_dev->pci_dev;
	unsigned long curr;
	int pools,vccs,rx;
	int error, i, ld;

	DPRINTK("zatm_start\n");
	zatm_dev->rx_map = zatm_dev->tx_map = NULL;
 	for (i = 0; i < NR_MBX; i++)
 		zatm_dev->mbx_start[i] = 0;
 	error = request_irq(zatm_dev->irq, zatm_int, SA_SHIRQ, DEV_LABEL, dev);
	if (error < 0) {
 		printk(KERN_ERR DEV_LABEL "(itf %d): IRQ%d is already in use\n",
 		    dev->number,zatm_dev->irq);
		goto done;
	}
	/* define memory regions */
	pools = NR_POOLS;
	if (NR_SHAPERS*SHAPER_SIZE > pools*POOL_SIZE)
		pools = NR_SHAPERS*SHAPER_SIZE/POOL_SIZE;
	vccs = (zatm_dev->mem-NR_SHAPERS*SHAPER_SIZE-pools*POOL_SIZE)/
	    (2*VC_SIZE+RX_SIZE);
	ld = -1;
	for (rx = 1; rx < vccs; rx <<= 1) ld++;
	dev->ci_range.vpi_bits = 0; /* @@@ no VPI for now */
	dev->ci_range.vci_bits = ld;
	dev->link_rate = ATM_OC3_PCR;
	zatm_dev->chans = vccs; /* ??? */
	curr = rx*RX_SIZE/4;
	DPRINTK("RX pool 0x%08lx\n",curr);
	zpokel(zatm_dev,curr,uPD98401_PMA); /* receive pool */
	zatm_dev->pool_base = curr;
	curr += pools*POOL_SIZE/4;
	DPRINTK("Shapers 0x%08lx\n",curr);
	zpokel(zatm_dev,curr,uPD98401_SMA); /* shapers */
	curr += NR_SHAPERS*SHAPER_SIZE/4;
	DPRINTK("Free    0x%08lx\n",curr);
	zpokel(zatm_dev,curr,uPD98401_TOS); /* free pool */
	printk(KERN_INFO DEV_LABEL "(itf %d): %d shapers, %d pools, %d RX, "
	    "%ld VCs\n",dev->number,NR_SHAPERS,pools,rx,
	    (zatm_dev->mem-curr*4)/VC_SIZE);
	/* create mailboxes */
	for (i = 0; i < NR_MBX; i++) {
		void *mbx;
		dma_addr_t mbx_dma;

		if (!mbx_entries[i])
			continue;
		mbx = pci_alloc_consistent(pdev, 2*MBX_SIZE(i), &mbx_dma);
		if (!mbx) {
			error = -ENOMEM;
			goto out;
		}
		/*
		 * Alignment provided by pci_alloc_consistent() isn't enough
		 * for this device.
		 */
		if (((unsigned long)mbx ^ mbx_dma) & 0xffff) {
			printk(KERN_ERR DEV_LABEL "(itf %d): system "
			       "bus incompatible with driver\n", dev->number);
			pci_free_consistent(pdev, 2*MBX_SIZE(i), mbx, mbx_dma);
			error = -ENODEV;
			goto out;
		}
		DPRINTK("mbx@0x%08lx-0x%08lx\n", mbx, mbx + MBX_SIZE(i));
		zatm_dev->mbx_start[i] = (unsigned long)mbx;
		zatm_dev->mbx_dma[i] = mbx_dma;
		zatm_dev->mbx_end[i] = (zatm_dev->mbx_start[i] + MBX_SIZE(i)) &
					0xffff;
		zout(mbx_dma >> 16, MSH(i));
		zout(mbx_dma, MSL(i));
		zout(zatm_dev->mbx_end[i], MBA(i));
		zout((unsigned long)mbx & 0xffff, MTA(i));
		zout((unsigned long)mbx & 0xffff, MWA(i));
	}
	error = start_tx(dev);
	if (error)
		goto out;
	error = start_rx(dev);
	if (error)
		goto out_tx;
	error = dev->phy->start(dev);
	if (error)
		goto out_rx;
	zout(0xffffffff,IMR); /* enable interrupts */
	/* enable TX & RX */
	zout(zin(GMR) | uPD98401_GMR_SE | uPD98401_GMR_RE,GMR);
done:
	return error;

out_rx:
	kfree(zatm_dev->rx_map);
out_tx:
	kfree(zatm_dev->tx_map);
out:
	while (i-- > 0) {
		pci_free_consistent(pdev, 2*MBX_SIZE(i), 
				    (void *)zatm_dev->mbx_start[i],
				    zatm_dev->mbx_dma[i]);
	}
	free_irq(zatm_dev->irq, dev);
	goto done;
}


static void zatm_close(struct atm_vcc *vcc)
{
        DPRINTK(">zatm_close\n");
        if (!ZATM_VCC(vcc)) return;
	clear_bit(ATM_VF_READY,&vcc->flags);
        close_rx(vcc);
	EVENT("close_tx\n",0,0);
        close_tx(vcc);
        DPRINTK("zatm_close: done waiting\n");
        /* deallocate memory */
        kfree(ZATM_VCC(vcc));
	vcc->dev_data = NULL;
	clear_bit(ATM_VF_ADDR,&vcc->flags);
}


static int zatm_open(struct atm_vcc *vcc)
{
	struct zatm_dev *zatm_dev;
	struct zatm_vcc *zatm_vcc;
	short vpi = vcc->vpi;
	int vci = vcc->vci;
	int error;

	DPRINTK(">zatm_open\n");
	zatm_dev = ZATM_DEV(vcc->dev);
	if (!test_bit(ATM_VF_PARTIAL,&vcc->flags))
		vcc->dev_data = NULL;
	if (vci != ATM_VPI_UNSPEC && vpi != ATM_VCI_UNSPEC)
		set_bit(ATM_VF_ADDR,&vcc->flags);
	if (vcc->qos.aal != ATM_AAL5) return -EINVAL; /* @@@ AAL0 */
	DPRINTK(DEV_LABEL "(itf %d): open %d.%d\n",vcc->dev->number,vcc->vpi,
	    vcc->vci);
	if (!test_bit(ATM_VF_PARTIAL,&vcc->flags)) {
		zatm_vcc = kmalloc(sizeof(struct zatm_vcc),GFP_KERNEL);
		if (!zatm_vcc) {
			clear_bit(ATM_VF_ADDR,&vcc->flags);
			return -ENOMEM;
		}
		vcc->dev_data = zatm_vcc;
		ZATM_VCC(vcc)->tx_chan = 0; /* for zatm_close after open_rx */
		if ((error = open_rx_first(vcc))) {
	                zatm_close(vcc);
	                return error;
	        }
		if ((error = open_tx_first(vcc))) {
			zatm_close(vcc);
			return error;
	        }
	}
	if (vci == ATM_VPI_UNSPEC || vpi == ATM_VCI_UNSPEC) return 0;
	if ((error = open_rx_second(vcc))) {
		zatm_close(vcc);
		return error;
        }
	if ((error = open_tx_second(vcc))) {
		zatm_close(vcc);
		return error;
        }
	set_bit(ATM_VF_READY,&vcc->flags);
        return 0;
}


static int zatm_change_qos(struct atm_vcc *vcc,struct atm_qos *qos,int flags)
{
	printk("Not yet implemented\n");
	return -ENOSYS;
	/* @@@ */
}


static int zatm_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
{
	struct zatm_dev *zatm_dev;
	unsigned long flags;

	zatm_dev = ZATM_DEV(dev);
	switch (cmd) {
		case ZATM_GETPOOLZ:
			if (!capable(CAP_NET_ADMIN)) return -EPERM;
			/* fall through */
		case ZATM_GETPOOL:
			{
				struct zatm_pool_info info;
				int pool;

				if (get_user(pool,
				    &((struct zatm_pool_req __user *) arg)->pool_num))
					return -EFAULT;
				if (pool < 0 || pool > ZATM_LAST_POOL)
					return -EINVAL;
				spin_lock_irqsave(&zatm_dev->lock, flags);
				info = zatm_dev->pool_info[pool];
				if (cmd == ZATM_GETPOOLZ) {
					zatm_dev->pool_info[pool].rqa_count = 0;
					zatm_dev->pool_info[pool].rqu_count = 0;
				}
				spin_unlock_irqrestore(&zatm_dev->lock, flags);
				return copy_to_user(
				    &((struct zatm_pool_req __user *) arg)->info,
				    &info,sizeof(info)) ? -EFAULT : 0;
			}
		case ZATM_SETPOOL:
			{
				struct zatm_pool_info info;
				int pool;

				if (!capable(CAP_NET_ADMIN)) return -EPERM;
				if (get_user(pool,
				    &((struct zatm_pool_req __user *) arg)->pool_num))
					return -EFAULT;
				if (pool < 0 || pool > ZATM_LAST_POOL)
					return -EINVAL;
				if (copy_from_user(&info,
				    &((struct zatm_pool_req __user *) arg)->info,
				    sizeof(info))) return -EFAULT;
				if (!info.low_water)
					info.low_water = zatm_dev->
					    pool_info[pool].low_water;
				if (!info.high_water)
					info.high_water = zatm_dev->
					    pool_info[pool].high_water;
				if (!info.next_thres)
					info.next_thres = zatm_dev->
					    pool_info[pool].next_thres;
				if (info.low_water >= info.high_water ||
				    info.low_water < 0)
					return -EINVAL;
				spin_lock_irqsave(&zatm_dev->lock, flags);
				zatm_dev->pool_info[pool].low_water =
				    info.low_water;
				zatm_dev->pool_info[pool].high_water =
				    info.high_water;
				zatm_dev->pool_info[pool].next_thres =
				    info.next_thres;
				spin_unlock_irqrestore(&zatm_dev->lock, flags);
				return 0;
			}
		default:
        		if (!dev->phy->ioctl) return -ENOIOCTLCMD;
		        return dev->phy->ioctl(dev,cmd,arg);
	}
}


static int zatm_getsockopt(struct atm_vcc *vcc,int level,int optname,
    void __user *optval,int optlen)
{
	return -EINVAL;
}


static int zatm_setsockopt(struct atm_vcc *vcc,int level,int optname,
    void __user *optval,int optlen)
{
	return -EINVAL;
}

static int zatm_send(struct atm_vcc *vcc,struct sk_buff *skb)
{
	int error;

	EVENT(">zatm_send 0x%lx\n",(unsigned long) skb,0);
	if (!ZATM_VCC(vcc)->tx_chan || !test_bit(ATM_VF_READY,&vcc->flags)) {
		if (vcc->pop) vcc->pop(vcc,skb);
		else dev_kfree_skb(skb);
		return -EINVAL;
	}
	if (!skb) {
		printk(KERN_CRIT "!skb in zatm_send ?\n");
		if (vcc->pop) vcc->pop(vcc,skb);
		return -EINVAL;
	}
	ATM_SKB(skb)->vcc = vcc;
	error = do_tx(skb);
	if (error != RING_BUSY) return error;
	skb_queue_tail(&ZATM_VCC(vcc)->backlog,skb);
	return 0;
}


static void zatm_phy_put(struct atm_dev *dev,unsigned char value,
    unsigned long addr)
{
	struct zatm_dev *zatm_dev;

	zatm_dev = ZATM_DEV(dev);
	zwait;
	zout(value,CER);
	zout(uPD98401_IND_ACC | uPD98401_IA_B0 |
	    (uPD98401_IA_TGT_PHY << uPD98401_IA_TGT_SHIFT) | addr,CMR);
}


static unsigned char zatm_phy_get(struct atm_dev *dev,unsigned long addr)
{
	struct zatm_dev *zatm_dev;

	zatm_dev = ZATM_DEV(dev);
	zwait;
	zout(uPD98401_IND_ACC | uPD98401_IA_B0 | uPD98401_IA_RW |
	  (uPD98401_IA_TGT_PHY << uPD98401_IA_TGT_SHIFT) | addr,CMR);
	zwait;
	return zin(CER) & 0xff;
}


static const struct atmdev_ops ops = {
	.open		= zatm_open,
	.close		= zatm_close,
	.ioctl		= zatm_ioctl,
	.getsockopt	= zatm_getsockopt,
	.setsockopt	= zatm_setsockopt,
	.send		= zatm_send,
	.phy_put	= zatm_phy_put,
	.phy_get	= zatm_phy_get,
	.change_qos	= zatm_change_qos,
};

static int __devinit zatm_init_one(struct pci_dev *pci_dev,
				   const struct pci_device_id *ent)
{
	struct atm_dev *dev;
	struct zatm_dev *zatm_dev;
	int ret = -ENOMEM;

	zatm_dev = (struct zatm_dev *) kmalloc(sizeof(*zatm_dev), GFP_KERNEL);
	if (!zatm_dev) {
		printk(KERN_EMERG "%s: memory shortage\n", DEV_LABEL);
		goto out;
	}

	dev = atm_dev_register(DEV_LABEL, &ops, -1, NULL);
	if (!dev)
		goto out_free;

	ret = pci_enable_device(pci_dev);
	if (ret < 0)
		goto out_deregister;

	ret = pci_request_regions(pci_dev, DEV_LABEL);
	if (ret < 0)
		goto out_disable;

	zatm_dev->pci_dev = pci_dev;
	dev->dev_data = zatm_dev;
	zatm_dev->copper = (int)ent->driver_data;
	if ((ret = zatm_init(dev)) || (ret = zatm_start(dev)))
		goto out_release;

	pci_set_drvdata(pci_dev, dev);
	zatm_dev->more = zatm_boards;
	zatm_boards = dev;
	ret = 0;
out:
	return ret;

out_release:
	pci_release_regions(pci_dev);
out_disable:
	pci_disable_device(pci_dev);
out_deregister:
	atm_dev_deregister(dev);
out_free:
	kfree(zatm_dev);
	goto out;
}


MODULE_LICENSE("GPL");

static struct pci_device_id zatm_pci_tbl[] __devinitdata = {
	{ PCI_VENDOR_ID_ZEITNET, PCI_DEVICE_ID_ZEITNET_1221,
		PCI_ANY_ID, PCI_ANY_ID, 0, 0, ZATM_COPPER },
	{ PCI_VENDOR_ID_ZEITNET, PCI_DEVICE_ID_ZEITNET_1225,
		PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, zatm_pci_tbl);

static struct pci_driver zatm_driver = {
	.name =		DEV_LABEL,
	.id_table =	zatm_pci_tbl,
	.probe =	zatm_init_one,
};

static int __init zatm_init_module(void)
{
	return pci_register_driver(&zatm_driver);
}

module_init(zatm_init_module);
/* module_exit not defined so not unloadable */