summaryrefslogtreecommitdiff
path: root/drivers/atm/firestream.c
blob: 6e600afd06ae6d0fbbaeb96d7aa02093954771b5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
/* drivers/atm/firestream.c - FireStream 155 (MB86697) and
 *                            FireStream  50 (MB86695) device driver 
 */
 
/* Written & (C) 2000 by R.E.Wolff@BitWizard.nl 
 * Copied snippets from zatm.c by Werner Almesberger, EPFL LRC/ICA 
 * and ambassador.c Copyright (C) 1995-1999  Madge Networks Ltd 
 */

/*
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  The GNU GPL is contained in /usr/doc/copyright/GPL on a Debian
  system and in the file COPYING in the Linux kernel source.
*/


#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/pci.h>
#include <linux/poison.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/ioport.h> /* for request_region */
#include <linux/uio.h>
#include <linux/init.h>
#include <linux/capability.h>
#include <linux/bitops.h>
#include <linux/slab.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 <linux/wait.h>

#include "firestream.h"

static int loopback = 0;
static int num=0x5a;

/* According to measurements (but they look suspicious to me!) done in
 * '97, 37% of the packets are one cell in size. So it pays to have
 * buffers allocated at that size. A large jump in percentage of
 * packets occurs at packets around 536 bytes in length. So it also
 * pays to have those pre-allocated. Unfortunately, we can't fully
 * take advantage of this as the majority of the packets is likely to
 * be TCP/IP (As where obviously the measurement comes from) There the
 * link would be opened with say a 1500 byte MTU, and we can't handle
 * smaller buffers more efficiently than the larger ones. -- REW
 */

/* Due to the way Linux memory management works, specifying "576" as
 * an allocation size here isn't going to help. They are allocated
 * from 1024-byte regions anyway. With the size of the sk_buffs (quite
 * large), it doesn't pay to allocate the smallest size (64) -- REW */

/* This is all guesswork. Hard numbers to back this up or disprove this, 
 * are appreciated. -- REW */

/* The last entry should be about 64k. However, the "buffer size" is
 * passed to the chip in a 16 bit field. I don't know how "65536"
 * would be interpreted. -- REW */

#define NP FS_NR_FREE_POOLS
static int rx_buf_sizes[NP]  = {128,  256,  512, 1024, 2048, 4096, 16384, 65520};
/* log2:                 7     8     9    10    11    12    14     16 */

#if 0
static int rx_pool_sizes[NP] = {1024, 1024, 512, 256,  128,  64,   32,    32};
#else
/* debug */
static int rx_pool_sizes[NP] = {128,  128,  128, 64,   64,   64,   32,    32};
#endif
/* log2:                 10    10    9    8     7     6     5      5  */
/* sumlog2:              17    18    18   18    18    18    19     21 */
/* mem allocated:        128k  256k  256k 256k  256k  256k  512k   2M */
/* tot mem: almost 4M */

/* NP is shorter, so that it fits on a single line. */
#undef NP


/* Small hardware gotcha:

   The FS50 CAM (VP/VC match registers) always take the lowest channel
   number that matches. This is not a problem.

   However, they also ignore whether the channel is enabled or
   not. This means that if you allocate channel 0 to 1.2 and then
   channel 1 to 0.0, then disabeling channel 0 and writing 0 to the
   match channel for channel 0 will "steal" the traffic from channel
   1, even if you correctly disable channel 0.

   Workaround: 

   - When disabling channels, write an invalid VP/VC value to the
   match register. (We use 0xffffffff, which in the worst case 
   matches VP/VC = <maxVP>/<maxVC>, but I expect it not to match
   anything as some "when not in use, program to 0" bits are now
   programmed to 1...)

   - Don't initialize the match registers to 0, as 0.0 is a valid
   channel.
*/


/* Optimization hints and tips.

   The FireStream chips are very capable of reducing the amount of
   "interrupt-traffic" for the CPU. This driver requests an interrupt on EVERY
   action. You could try to minimize this a bit. 

   Besides that, the userspace->kernel copy and the PCI bus are the
   performance limiting issues for this driver.

   You could queue up a bunch of outgoing packets without telling the
   FireStream. I'm not sure that's going to win you much though. The
   Linux layer won't tell us in advance when it's not going to give us
   any more packets in a while. So this is tricky to implement right without
   introducing extra delays. 
  
   -- REW
 */




/* The strings that define what the RX queue entry is all about. */
/* Fujitsu: Please tell me which ones can have a pointer to a 
   freepool descriptor! */
static char *res_strings[] = {
	"RX OK: streaming not EOP", 
	"RX OK: streaming EOP", 
	"RX OK: Single buffer packet", 
	"RX OK: packet mode", 
	"RX OK: F4 OAM (end to end)", 
	"RX OK: F4 OAM (Segment)", 
	"RX OK: F5 OAM (end to end)", 
	"RX OK: F5 OAM (Segment)", 
	"RX OK: RM cell", 
	"RX OK: TRANSP cell", 
	"RX OK: TRANSPC cell", 
	"Unmatched cell", 
	"reserved 12", 
	"reserved 13", 
	"reserved 14", 
	"Unrecognized cell", 
	"reserved 16", 
	"reassemby abort: AAL5 abort", 
	"packet purged", 
	"packet ageing timeout", 
	"channel ageing timeout", 
	"calculated length error", 
	"programmed length limit error", 
	"aal5 crc32 error", 
	"oam transp or transpc crc10 error", 
	"reserved 25", 
	"reserved 26", 
	"reserved 27", 
	"reserved 28", 
	"reserved 29", 
	"reserved 30", 
	"reassembly abort: no buffers", 
	"receive buffer overflow", 
	"change in GFC", 
	"receive buffer full", 
	"low priority discard - no receive descriptor", 
	"low priority discard - missing end of packet", 
	"reserved 41", 
	"reserved 42", 
	"reserved 43", 
	"reserved 44", 
	"reserved 45", 
	"reserved 46", 
	"reserved 47", 
	"reserved 48", 
	"reserved 49", 
	"reserved 50", 
	"reserved 51", 
	"reserved 52", 
	"reserved 53", 
	"reserved 54", 
	"reserved 55", 
	"reserved 56", 
	"reserved 57", 
	"reserved 58", 
	"reserved 59", 
	"reserved 60", 
	"reserved 61", 
	"reserved 62", 
	"reserved 63", 
};  

static char *irq_bitname[] = {
	"LPCO",
	"DPCO",
	"RBRQ0_W",
	"RBRQ1_W",
	"RBRQ2_W",
	"RBRQ3_W",
	"RBRQ0_NF",
	"RBRQ1_NF",
	"RBRQ2_NF",
	"RBRQ3_NF",
	"BFP_SC",
	"INIT",
	"INIT_ERR",
	"USCEO",
	"UPEC0",
	"VPFCO",
	"CRCCO",
	"HECO",
	"TBRQ_W",
	"TBRQ_NF",
	"CTPQ_E",
	"GFC_C0",
	"PCI_FTL",
	"CSQ_W",
	"CSQ_NF",
	"EXT_INT",
	"RXDMA_S"
};


#define PHY_EOF -1
#define PHY_CLEARALL -2

struct reginit_item {
	int reg, val;
};


static struct reginit_item PHY_NTC_INIT[] __devinitdata = {
	{ PHY_CLEARALL, 0x40 }, 
	{ 0x12,  0x0001 },
	{ 0x13,  0x7605 },
	{ 0x1A,  0x0001 },
	{ 0x1B,  0x0005 },
	{ 0x38,  0x0003 },
	{ 0x39,  0x0006 },   /* changed here to make loopback */
	{ 0x01,  0x5262 },
	{ 0x15,  0x0213 },
	{ 0x00,  0x0003 },
	{ PHY_EOF, 0},    /* -1 signals end of list */
};


/* Safetyfeature: If the card interrupts more than this number of times
   in a jiffy (1/100th of a second) then we just disable the interrupt and
   print a message. This prevents the system from hanging. 

   150000 packets per second is close to the limit a PC is going to have
   anyway. We therefore have to disable this for production. -- REW */
#undef IRQ_RATE_LIMIT // 100

/* Interrupts work now. Unlike serial cards, ATM cards don't work all
   that great without interrupts. -- REW */
#undef FS_POLL_FREQ // 100

/* 
   This driver can spew a whole lot of debugging output at you. If you
   need maximum performance, you should disable the DEBUG define. To
   aid in debugging in the field, I'm leaving the compile-time debug
   features enabled, and disable them "runtime". That allows me to
   instruct people with problems to enable debugging without requiring
   them to recompile... -- REW
*/
#define DEBUG

#ifdef DEBUG
#define fs_dprintk(f, str...) if (fs_debug & f) printk (str)
#else
#define fs_dprintk(f, str...) /* nothing */
#endif


static int fs_keystream = 0;

#ifdef DEBUG
/* I didn't forget to set this to zero before shipping. Hit me with a stick 
   if you get this with the debug default not set to zero again. -- REW */
static int fs_debug = 0;
#else
#define fs_debug 0
#endif

#ifdef MODULE
#ifdef DEBUG 
module_param(fs_debug, int, 0644);
#endif
module_param(loopback, int, 0);
module_param(num, int, 0);
module_param(fs_keystream, int, 0);
/* XXX Add rx_buf_sizes, and rx_pool_sizes As per request Amar. -- REW */
#endif


#define FS_DEBUG_FLOW    0x00000001
#define FS_DEBUG_OPEN    0x00000002
#define FS_DEBUG_QUEUE   0x00000004
#define FS_DEBUG_IRQ     0x00000008
#define FS_DEBUG_INIT    0x00000010
#define FS_DEBUG_SEND    0x00000020
#define FS_DEBUG_PHY     0x00000040
#define FS_DEBUG_CLEANUP 0x00000080
#define FS_DEBUG_QOS     0x00000100
#define FS_DEBUG_TXQ     0x00000200
#define FS_DEBUG_ALLOC   0x00000400
#define FS_DEBUG_TXMEM   0x00000800
#define FS_DEBUG_QSIZE   0x00001000


#define func_enter() fs_dprintk(FS_DEBUG_FLOW, "fs: enter %s\n", __func__)
#define func_exit()  fs_dprintk(FS_DEBUG_FLOW, "fs: exit  %s\n", __func__)


static struct fs_dev *fs_boards = NULL;

#ifdef DEBUG

static void my_hd (void *addr, int len)
{
	int j, ch;
	unsigned char *ptr = addr;

	while (len > 0) {
		printk ("%p ", ptr);
		for (j=0;j < ((len < 16)?len:16);j++) {
			printk ("%02x %s", ptr[j], (j==7)?" ":"");
		}
		for (  ;j < 16;j++) {
			printk ("   %s", (j==7)?" ":"");
		}
		for (j=0;j < ((len < 16)?len:16);j++) {
			ch = ptr[j];
			printk ("%c", (ch < 0x20)?'.':((ch > 0x7f)?'.':ch));
		}
		printk ("\n");
		ptr += 16;
		len -= 16;
	}
}
#else /* DEBUG */
static void my_hd (void *addr, int len){}
#endif /* DEBUG */

/********** free an skb (as per ATM device driver documentation) **********/

/* Hmm. If this is ATM specific, why isn't there an ATM routine for this?
 * I copied it over from the ambassador driver. -- REW */

static inline void fs_kfree_skb (struct sk_buff * skb) 
{
	if (ATM_SKB(skb)->vcc->pop)
		ATM_SKB(skb)->vcc->pop (ATM_SKB(skb)->vcc, skb);
	else
		dev_kfree_skb_any (skb);
}




/* It seems the ATM forum recommends this horribly complicated 16bit
 * floating point format. Turns out the Ambassador uses the exact same
 * encoding. I just copied it over. If Mitch agrees, I'll move it over
 * to the atm_misc file or something like that. (and remove it from 
 * here and the ambassador driver) -- REW
 */

/* The good thing about this format is that it is monotonic. So, 
   a conversion routine need not be very complicated. To be able to
   round "nearest" we need to take along a few extra bits. Lets
   put these after 16 bits, so that we can just return the top 16
   bits of the 32bit number as the result:

   int mr (unsigned int rate, int r) 
     {
     int e = 16+9;
     static int round[4]={0, 0, 0xffff, 0x8000};
     if (!rate) return 0;
     while (rate & 0xfc000000) {
       rate >>= 1;
       e++;
     }
     while (! (rate & 0xfe000000)) {
       rate <<= 1;
       e--;
     }

// Now the mantissa is in positions bit 16-25. Excepf for the "hidden 1" that's in bit 26.
     rate &= ~0x02000000;
// Next add in the exponent
     rate |= e << (16+9);
// And perform the rounding:
     return (rate + round[r]) >> 16;
   }

   14 lines-of-code. Compare that with the 120 that the Ambassador
   guys needed. (would be 8 lines shorter if I'd try to really reduce
   the number of lines:

   int mr (unsigned int rate, int r) 
   {
     int e = 16+9;
     static int round[4]={0, 0, 0xffff, 0x8000};
     if (!rate) return 0;
     for (;  rate & 0xfc000000 ;rate >>= 1, e++);
     for (;!(rate & 0xfe000000);rate <<= 1, e--);
     return ((rate & ~0x02000000) | (e << (16+9)) + round[r]) >> 16;
   }

   Exercise for the reader: Remove one more line-of-code, without
   cheating. (Just joining two lines is cheating). (I know it's
   possible, don't think you've beat me if you found it... If you
   manage to lose two lines or more, keep me updated! ;-)

   -- REW */


#define ROUND_UP      1
#define ROUND_DOWN    2
#define ROUND_NEAREST 3
/********** make rate (not quite as much fun as Horizon) **********/

static unsigned int make_rate (unsigned int rate, int r,
			       u16 * bits, unsigned int * actual) 
{
	unsigned char exp = -1; /* hush gcc */
	unsigned int man = -1;  /* hush gcc */
  
	fs_dprintk (FS_DEBUG_QOS, "make_rate %u", rate);
  
	/* rates in cells per second, ITU format (nasty 16-bit floating-point)
	   given 5-bit e and 9-bit m:
	   rate = EITHER (1+m/2^9)*2^e    OR 0
	   bits = EITHER 1<<14 | e<<9 | m OR 0
	   (bit 15 is "reserved", bit 14 "non-zero")
	   smallest rate is 0 (special representation)
	   largest rate is (1+511/512)*2^31 = 4290772992 (< 2^32-1)
	   smallest non-zero rate is (1+0/512)*2^0 = 1 (> 0)
	   simple algorithm:
	   find position of top bit, this gives e
	   remove top bit and shift (rounding if feeling clever) by 9-e
	*/
	/* Ambassador ucode bug: please don't set bit 14! so 0 rate not
	   representable. // This should move into the ambassador driver
	   when properly merged. -- REW */
  
	if (rate > 0xffc00000U) {
		/* larger than largest representable rate */
    
		if (r == ROUND_UP) {
			return -EINVAL;
		} else {
			exp = 31;
			man = 511;
		}
    
	} else if (rate) {
		/* representable rate */
    
		exp = 31;
		man = rate;
    
		/* invariant: rate = man*2^(exp-31) */
		while (!(man & (1<<31))) {
			exp = exp - 1;
			man = man<<1;
		}
    
		/* man has top bit set
		   rate = (2^31+(man-2^31))*2^(exp-31)
		   rate = (1+(man-2^31)/2^31)*2^exp 
		*/
		man = man<<1;
		man &= 0xffffffffU; /* a nop on 32-bit systems */
		/* rate = (1+man/2^32)*2^exp
    
		   exp is in the range 0 to 31, man is in the range 0 to 2^32-1
		   time to lose significance... we want m in the range 0 to 2^9-1
		   rounding presents a minor problem... we first decide which way
		   we are rounding (based on given rounding direction and possibly
		   the bits of the mantissa that are to be discarded).
		*/

		switch (r) {
		case ROUND_DOWN: {
			/* just truncate */
			man = man>>(32-9);
			break;
		}
		case ROUND_UP: {
			/* check all bits that we are discarding */
			if (man & (~0U>>9)) {
				man = (man>>(32-9)) + 1;
				if (man == (1<<9)) {
					/* no need to check for round up outside of range */
					man = 0;
					exp += 1;
				}
			} else {
				man = (man>>(32-9));
			}
			break;
		}
		case ROUND_NEAREST: {
			/* check msb that we are discarding */
			if (man & (1<<(32-9-1))) {
				man = (man>>(32-9)) + 1;
				if (man == (1<<9)) {
					/* no need to check for round up outside of range */
					man = 0;
					exp += 1;
				}
			} else {
				man = (man>>(32-9));
			}
			break;
		}
		}
    
	} else {
		/* zero rate - not representable */
    
		if (r == ROUND_DOWN) {
			return -EINVAL;
		} else {
			exp = 0;
			man = 0;
		}
	}
  
	fs_dprintk (FS_DEBUG_QOS, "rate: man=%u, exp=%hu", man, exp);
  
	if (bits)
		*bits = /* (1<<14) | */ (exp<<9) | man;
  
	if (actual)
		*actual = (exp >= 9)
			? (1 << exp) + (man << (exp-9))
			: (1 << exp) + ((man + (1<<(9-exp-1))) >> (9-exp));
  
	return 0;
}




/* FireStream access routines */
/* For DEEP-DOWN debugging these can be rigged to intercept accesses to
   certain registers or to just log all accesses. */

static inline void write_fs (struct fs_dev *dev, int offset, u32 val)
{
	writel (val, dev->base + offset);
}


static inline u32  read_fs (struct fs_dev *dev, int offset)
{
	return readl (dev->base + offset);
}



static inline struct FS_QENTRY *get_qentry (struct fs_dev *dev, struct queue *q)
{
	return bus_to_virt (read_fs (dev, Q_WP(q->offset)) & Q_ADDR_MASK);
}


static void submit_qentry (struct fs_dev *dev, struct queue *q, struct FS_QENTRY *qe)
{
	u32 wp;
	struct FS_QENTRY *cqe;

	/* XXX Sanity check: the write pointer can be checked to be 
	   still the same as the value passed as qe... -- REW */
	/*  udelay (5); */
	while ((wp = read_fs (dev, Q_WP (q->offset))) & Q_FULL) {
		fs_dprintk (FS_DEBUG_TXQ, "Found queue at %x full. Waiting.\n", 
			    q->offset);
		schedule ();
	}

	wp &= ~0xf;
	cqe = bus_to_virt (wp);
	if (qe != cqe) {
		fs_dprintk (FS_DEBUG_TXQ, "q mismatch! %p %p\n", qe, cqe);
	}

	write_fs (dev, Q_WP(q->offset), Q_INCWRAP);

	{
		static int c;
		if (!(c++ % 100))
			{
				int rp, wp;
				rp =  read_fs (dev, Q_RP(q->offset));
				wp =  read_fs (dev, Q_WP(q->offset));
				fs_dprintk (FS_DEBUG_TXQ, "q at %d: %x-%x: %x entries.\n", 
					    q->offset, rp, wp, wp-rp);
			}
	}
}

#ifdef DEBUG_EXTRA
static struct FS_QENTRY pq[60];
static int qp;

static struct FS_BPENTRY dq[60];
static int qd;
static void *da[60];
#endif 

static void submit_queue (struct fs_dev *dev, struct queue *q, 
			  u32 cmd, u32 p1, u32 p2, u32 p3)
{
	struct FS_QENTRY *qe;

	qe = get_qentry (dev, q);
	qe->cmd = cmd;
	qe->p0 = p1;
	qe->p1 = p2;
	qe->p2 = p3;
	submit_qentry (dev,  q, qe);

#ifdef DEBUG_EXTRA
	pq[qp].cmd = cmd;
	pq[qp].p0 = p1;
	pq[qp].p1 = p2;
	pq[qp].p2 = p3;
	qp++;
	if (qp >= 60) qp = 0;
#endif
}

/* Test the "other" way one day... -- REW */
#if 1
#define submit_command submit_queue
#else

static void submit_command (struct fs_dev *dev, struct queue *q, 
			    u32 cmd, u32 p1, u32 p2, u32 p3)
{
	write_fs (dev, CMDR0, cmd);
	write_fs (dev, CMDR1, p1);
	write_fs (dev, CMDR2, p2);
	write_fs (dev, CMDR3, p3);
}
#endif



static void process_return_queue (struct fs_dev *dev, struct queue *q)
{
	long rq;
	struct FS_QENTRY *qe;
	void *tc;
  
	while (!((rq = read_fs (dev, Q_RP(q->offset))) & Q_EMPTY)) {
		fs_dprintk (FS_DEBUG_QUEUE, "reaping return queue entry at %lx\n", rq); 
		qe = bus_to_virt (rq);
    
		fs_dprintk (FS_DEBUG_QUEUE, "queue entry: %08x %08x %08x %08x. (%d)\n", 
			    qe->cmd, qe->p0, qe->p1, qe->p2, STATUS_CODE (qe));

		switch (STATUS_CODE (qe)) {
		case 5:
			tc = bus_to_virt (qe->p0);
			fs_dprintk (FS_DEBUG_ALLOC, "Free tc: %p\n", tc);
			kfree (tc);
			break;
		}
    
		write_fs (dev, Q_RP(q->offset), Q_INCWRAP);
	}
}


static void process_txdone_queue (struct fs_dev *dev, struct queue *q)
{
	long rq;
	long tmp;
	struct FS_QENTRY *qe;
	struct sk_buff *skb;
	struct FS_BPENTRY *td;

	while (!((rq = read_fs (dev, Q_RP(q->offset))) & Q_EMPTY)) {
		fs_dprintk (FS_DEBUG_QUEUE, "reaping txdone entry at %lx\n", rq); 
		qe = bus_to_virt (rq);
    
		fs_dprintk (FS_DEBUG_QUEUE, "queue entry: %08x %08x %08x %08x: %d\n", 
			    qe->cmd, qe->p0, qe->p1, qe->p2, STATUS_CODE (qe));

		if (STATUS_CODE (qe) != 2)
			fs_dprintk (FS_DEBUG_TXMEM, "queue entry: %08x %08x %08x %08x: %d\n", 
				    qe->cmd, qe->p0, qe->p1, qe->p2, STATUS_CODE (qe));


		switch (STATUS_CODE (qe)) {
		case 0x01: /* This is for AAL0 where we put the chip in streaming mode */
			/* Fall through */
		case 0x02:
			/* Process a real txdone entry. */
			tmp = qe->p0;
			if (tmp & 0x0f)
				printk (KERN_WARNING "td not aligned: %ld\n", tmp);
			tmp &= ~0x0f;
			td = bus_to_virt (tmp);

			fs_dprintk (FS_DEBUG_QUEUE, "Pool entry: %08x %08x %08x %08x %p.\n", 
				    td->flags, td->next, td->bsa, td->aal_bufsize, td->skb );
      
			skb = td->skb;
			if (skb == FS_VCC (ATM_SKB(skb)->vcc)->last_skb) {
				wake_up_interruptible (& FS_VCC (ATM_SKB(skb)->vcc)->close_wait);
				FS_VCC (ATM_SKB(skb)->vcc)->last_skb = NULL;
			}
			td->dev->ntxpckts--;

			{
				static int c=0;
	
				if (!(c++ % 100)) {
					fs_dprintk (FS_DEBUG_QSIZE, "[%d]", td->dev->ntxpckts);
				}
			}

			atomic_inc(&ATM_SKB(skb)->vcc->stats->tx);

			fs_dprintk (FS_DEBUG_TXMEM, "i");
			fs_dprintk (FS_DEBUG_ALLOC, "Free t-skb: %p\n", skb);
			fs_kfree_skb (skb);

			fs_dprintk (FS_DEBUG_ALLOC, "Free trans-d: %p\n", td); 
			memset (td, ATM_POISON_FREE, sizeof(struct FS_BPENTRY));
			kfree (td);
			break;
		default:
			/* Here we get the tx purge inhibit command ... */
			/* Action, I believe, is "don't do anything". -- REW */
			;
		}
    
		write_fs (dev, Q_RP(q->offset), Q_INCWRAP);
	}
}


static void process_incoming (struct fs_dev *dev, struct queue *q)
{
	long rq;
	struct FS_QENTRY *qe;
	struct FS_BPENTRY *pe;    
	struct sk_buff *skb;
	unsigned int channo;
	struct atm_vcc *atm_vcc;

	while (!((rq = read_fs (dev, Q_RP(q->offset))) & Q_EMPTY)) {
		fs_dprintk (FS_DEBUG_QUEUE, "reaping incoming queue entry at %lx\n", rq); 
		qe = bus_to_virt (rq);
    
		fs_dprintk (FS_DEBUG_QUEUE, "queue entry: %08x %08x %08x %08x.  ", 
			    qe->cmd, qe->p0, qe->p1, qe->p2);

		fs_dprintk (FS_DEBUG_QUEUE, "-> %x: %s\n", 
			    STATUS_CODE (qe), 
			    res_strings[STATUS_CODE(qe)]);

		pe = bus_to_virt (qe->p0);
		fs_dprintk (FS_DEBUG_QUEUE, "Pool entry: %08x %08x %08x %08x %p %p.\n", 
			    pe->flags, pe->next, pe->bsa, pe->aal_bufsize, 
			    pe->skb, pe->fp);
      
		channo = qe->cmd & 0xffff;

		if (channo < dev->nchannels)
			atm_vcc = dev->atm_vccs[channo];
		else
			atm_vcc = NULL;

		/* Single buffer packet */
		switch (STATUS_CODE (qe)) {
		case 0x1:
			/* Fall through for streaming mode */
		case 0x2:/* Packet received OK.... */
			if (atm_vcc) {
				skb = pe->skb;
				pe->fp->n--;
#if 0
				fs_dprintk (FS_DEBUG_QUEUE, "Got skb: %p\n", skb);
				if (FS_DEBUG_QUEUE & fs_debug) my_hd (bus_to_virt (pe->bsa), 0x20);
#endif
				skb_put (skb, qe->p1 & 0xffff); 
				ATM_SKB(skb)->vcc = atm_vcc;
				atomic_inc(&atm_vcc->stats->rx);
				__net_timestamp(skb);
				fs_dprintk (FS_DEBUG_ALLOC, "Free rec-skb: %p (pushed)\n", skb);
				atm_vcc->push (atm_vcc, skb);
				fs_dprintk (FS_DEBUG_ALLOC, "Free rec-d: %p\n", pe);
				kfree (pe);
			} else {
				printk (KERN_ERR "Got a receive on a non-open channel %d.\n", channo);
			}
			break;
		case 0x17:/* AAL 5 CRC32 error. IFF the length field is nonzero, a buffer
			     has been consumed and needs to be processed. -- REW */
			if (qe->p1 & 0xffff) {
				pe = bus_to_virt (qe->p0);
				pe->fp->n--;
				fs_dprintk (FS_DEBUG_ALLOC, "Free rec-skb: %p\n", pe->skb);
				dev_kfree_skb_any (pe->skb);
				fs_dprintk (FS_DEBUG_ALLOC, "Free rec-d: %p\n", pe);
				kfree (pe);
			}
			if (atm_vcc)
				atomic_inc(&atm_vcc->stats->rx_drop);
			break;
		case 0x1f: /*  Reassembly abort: no buffers. */
			/* Silently increment error counter. */
			if (atm_vcc)
				atomic_inc(&atm_vcc->stats->rx_drop);
			break;
		default: /* Hmm. Haven't written the code to handle the others yet... -- REW */
			printk (KERN_WARNING "Don't know what to do with RX status %x: %s.\n", 
				STATUS_CODE(qe), res_strings[STATUS_CODE (qe)]);
		}
		write_fs (dev, Q_RP(q->offset), Q_INCWRAP);
	}
}



#define DO_DIRECTION(tp) ((tp)->traffic_class != ATM_NONE)

static int fs_open(struct atm_vcc *atm_vcc)
{
	struct fs_dev *dev;
	struct fs_vcc *vcc;
	struct fs_transmit_config *tc;
	struct atm_trafprm * txtp;
	struct atm_trafprm * rxtp;
	/*  struct fs_receive_config *rc;*/
	/*  struct FS_QENTRY *qe; */
	int error;
	int bfp;
	int to;
	unsigned short tmc0;
	short vpi = atm_vcc->vpi;
	int vci = atm_vcc->vci;

	func_enter ();

	dev = FS_DEV(atm_vcc->dev);
	fs_dprintk (FS_DEBUG_OPEN, "fs: open on dev: %p, vcc at %p\n", 
		    dev, atm_vcc);

	if (vci != ATM_VPI_UNSPEC && vpi != ATM_VCI_UNSPEC)
		set_bit(ATM_VF_ADDR, &atm_vcc->flags);

	if ((atm_vcc->qos.aal != ATM_AAL5) &&
	    (atm_vcc->qos.aal != ATM_AAL2))
	  return -EINVAL; /* XXX AAL0 */

	fs_dprintk (FS_DEBUG_OPEN, "fs: (itf %d): open %d.%d\n", 
		    atm_vcc->dev->number, atm_vcc->vpi, atm_vcc->vci);	

	/* XXX handle qos parameters (rate limiting) ? */

	vcc = kmalloc(sizeof(struct fs_vcc), GFP_KERNEL);
	fs_dprintk (FS_DEBUG_ALLOC, "Alloc VCC: %p(%Zd)\n", vcc, sizeof(struct fs_vcc));
	if (!vcc) {
		clear_bit(ATM_VF_ADDR, &atm_vcc->flags);
		return -ENOMEM;
	}
  
	atm_vcc->dev_data = vcc;
	vcc->last_skb = NULL;

	init_waitqueue_head (&vcc->close_wait);

	txtp = &atm_vcc->qos.txtp;
	rxtp = &atm_vcc->qos.rxtp;

	if (!test_bit(ATM_VF_PARTIAL, &atm_vcc->flags)) {
		if (IS_FS50(dev)) {
			/* Increment the channel numer: take a free one next time.  */
			for (to=33;to;to--, dev->channo++) {
				/* We only have 32 channels */
				if (dev->channo >= 32)
					dev->channo = 0;
				/* If we need to do RX, AND the RX is inuse, try the next */
				if (DO_DIRECTION(rxtp) && dev->atm_vccs[dev->channo])
					continue;
				/* If we need to do TX, AND the TX is inuse, try the next */
				if (DO_DIRECTION(txtp) && test_bit (dev->channo, dev->tx_inuse))
					continue;
				/* Ok, both are free! (or not needed) */
				break;
			}
			if (!to) {
				printk ("No more free channels for FS50..\n");
				return -EBUSY;
			}
			vcc->channo = dev->channo;
			dev->channo &= dev->channel_mask;
      
		} else {
			vcc->channo = (vpi << FS155_VCI_BITS) | (vci);
			if (((DO_DIRECTION(rxtp) && dev->atm_vccs[vcc->channo])) ||
			    ( DO_DIRECTION(txtp) && test_bit (vcc->channo, dev->tx_inuse))) {
				printk ("Channel is in use for FS155.\n");
				return -EBUSY;
			}
		}
		fs_dprintk (FS_DEBUG_OPEN, "OK. Allocated channel %x(%d).\n", 
			    vcc->channo, vcc->channo);
	}

	if (DO_DIRECTION (txtp)) {
		tc = kmalloc (sizeof (struct fs_transmit_config), GFP_KERNEL);
		fs_dprintk (FS_DEBUG_ALLOC, "Alloc tc: %p(%Zd)\n",
			    tc, sizeof (struct fs_transmit_config));
		if (!tc) {
			fs_dprintk (FS_DEBUG_OPEN, "fs: can't alloc transmit_config.\n");
			return -ENOMEM;
		}

		/* Allocate the "open" entry from the high priority txq. This makes
		   it most likely that the chip will notice it. It also prevents us
		   from having to wait for completion. On the other hand, we may
		   need to wait for completion anyway, to see if it completed
		   successfully. */

		switch (atm_vcc->qos.aal) {
		case ATM_AAL2:
		case ATM_AAL0:
		  tc->flags = 0
		    | TC_FLAGS_TRANSPARENT_PAYLOAD
		    | TC_FLAGS_PACKET
		    | (1 << 28)
		    | TC_FLAGS_TYPE_UBR /* XXX Change to VBR -- PVDL */
		    | TC_FLAGS_CAL0;
		  break;
		case ATM_AAL5:
		  tc->flags = 0
			| TC_FLAGS_AAL5
			| TC_FLAGS_PACKET  /* ??? */
			| TC_FLAGS_TYPE_CBR
			| TC_FLAGS_CAL0;
		  break;
		default:
			printk ("Unknown aal: %d\n", atm_vcc->qos.aal);
			tc->flags = 0;
		}
		/* Docs are vague about this atm_hdr field. By the way, the FS
		 * chip makes odd errors if lower bits are set.... -- REW */
		tc->atm_hdr =  (vpi << 20) | (vci << 4); 
		tmc0 = 0;
		{
			int pcr = atm_pcr_goal (txtp);

			fs_dprintk (FS_DEBUG_OPEN, "pcr = %d.\n", pcr);

			/* XXX Hmm. officially we're only allowed to do this if rounding 
			   is round_down -- REW */
			if (IS_FS50(dev)) {
				if (pcr > 51840000/53/8)  pcr = 51840000/53/8;
			} else {
				if (pcr > 155520000/53/8) pcr = 155520000/53/8;
			}
			if (!pcr) {
				/* no rate cap */
				tmc0 = IS_FS50(dev)?0x61BE:0x64c9; /* Just copied over the bits from Fujitsu -- REW */
			} else {
				int r;
				if (pcr < 0) {
					r = ROUND_DOWN;
					pcr = -pcr;
				} else {
					r = ROUND_UP;
				}
				error = make_rate (pcr, r, &tmc0, NULL);
				if (error) {
					kfree(tc);
					return error;
				}
			}
			fs_dprintk (FS_DEBUG_OPEN, "pcr = %d.\n", pcr);
		}
      
		tc->TMC[0] = tmc0 | 0x4000;
		tc->TMC[1] = 0; /* Unused */
		tc->TMC[2] = 0; /* Unused */
		tc->TMC[3] = 0; /* Unused */
    
		tc->spec = 0;    /* UTOPIA address, UDF, HEC: Unused -> 0 */
		tc->rtag[0] = 0; /* What should I do with routing tags??? 
				    -- Not used -- AS -- Thanks -- REW*/
		tc->rtag[1] = 0;
		tc->rtag[2] = 0;

		if (fs_debug & FS_DEBUG_OPEN) {
			fs_dprintk (FS_DEBUG_OPEN, "TX config record:\n");
			my_hd (tc, sizeof (*tc));
		}

		/* We now use the "submit_command" function to submit commands to
		   the firestream. There is a define up near the definition of
		   that routine that switches this routine between immediate write
		   to the immediate comamnd registers and queuing the commands in
		   the HPTXQ for execution. This last technique might be more
		   efficient if we know we're going to submit a whole lot of
		   commands in one go, but this driver is not setup to be able to
		   use such a construct. So it probably doen't matter much right
		   now. -- REW */
    
		/* The command is IMMediate and INQueue. The parameters are out-of-line.. */
		submit_command (dev, &dev->hp_txq, 
				QE_CMD_CONFIG_TX | QE_CMD_IMM_INQ | vcc->channo,
				virt_to_bus (tc), 0, 0);

		submit_command (dev, &dev->hp_txq, 
				QE_CMD_TX_EN | QE_CMD_IMM_INQ | vcc->channo,
				0, 0, 0);
		set_bit (vcc->channo, dev->tx_inuse);
	}

	if (DO_DIRECTION (rxtp)) {
		dev->atm_vccs[vcc->channo] = atm_vcc;

		for (bfp = 0;bfp < FS_NR_FREE_POOLS; bfp++)
			if (atm_vcc->qos.rxtp.max_sdu <= dev->rx_fp[bfp].bufsize) break;
		if (bfp >= FS_NR_FREE_POOLS) {
			fs_dprintk (FS_DEBUG_OPEN, "No free pool fits sdu: %d.\n", 
				    atm_vcc->qos.rxtp.max_sdu);
			/* XXX Cleanup? -- Would just calling fs_close work??? -- REW */

			/* XXX clear tx inuse. Close TX part? */
			dev->atm_vccs[vcc->channo] = NULL;
			kfree (vcc);
			return -EINVAL;
		}

		switch (atm_vcc->qos.aal) {
		case ATM_AAL0:
		case ATM_AAL2:
			submit_command (dev, &dev->hp_txq,
					QE_CMD_CONFIG_RX | QE_CMD_IMM_INQ | vcc->channo,
					RC_FLAGS_TRANSP |
					RC_FLAGS_BFPS_BFP * bfp |
					RC_FLAGS_RXBM_PSB, 0, 0);
			break;
		case ATM_AAL5:
			submit_command (dev, &dev->hp_txq,
					QE_CMD_CONFIG_RX | QE_CMD_IMM_INQ | vcc->channo,
					RC_FLAGS_AAL5 |
					RC_FLAGS_BFPS_BFP * bfp |
					RC_FLAGS_RXBM_PSB, 0, 0);
			break;
		};
		if (IS_FS50 (dev)) {
			submit_command (dev, &dev->hp_txq, 
					QE_CMD_REG_WR | QE_CMD_IMM_INQ,
					0x80 + vcc->channo,
					(vpi << 16) | vci, 0 ); /* XXX -- Use defines. */
		}
		submit_command (dev, &dev->hp_txq, 
				QE_CMD_RX_EN | QE_CMD_IMM_INQ | vcc->channo,
				0, 0, 0);
	}
    
	/* Indicate we're done! */
	set_bit(ATM_VF_READY, &atm_vcc->flags);

	func_exit ();
	return 0;
}


static void fs_close(struct atm_vcc *atm_vcc)
{
	struct fs_dev *dev = FS_DEV (atm_vcc->dev);
	struct fs_vcc *vcc = FS_VCC (atm_vcc);
	struct atm_trafprm * txtp;
	struct atm_trafprm * rxtp;

	func_enter ();

	clear_bit(ATM_VF_READY, &atm_vcc->flags);

	fs_dprintk (FS_DEBUG_QSIZE, "--==**[%d]**==--", dev->ntxpckts);
	if (vcc->last_skb) {
		fs_dprintk (FS_DEBUG_QUEUE, "Waiting for skb %p to be sent.\n", 
			    vcc->last_skb);
		/* We're going to wait for the last packet to get sent on this VC. It would
		   be impolite not to send them don't you think? 
		   XXX
		   We don't know which packets didn't get sent. So if we get interrupted in 
		   this sleep_on, we'll lose any reference to these packets. Memory leak!
		   On the other hand, it's awfully convenient that we can abort a "close" that
		   is taking too long. Maybe just use non-interruptible sleep on? -- REW */
		interruptible_sleep_on (& vcc->close_wait);
	}

	txtp = &atm_vcc->qos.txtp;
	rxtp = &atm_vcc->qos.rxtp;
  

	/* See App note XXX (Unpublished as of now) for the reason for the 
	   removal of the "CMD_IMM_INQ" part of the TX_PURGE_INH... -- REW */

	if (DO_DIRECTION (txtp)) {
		submit_command (dev,  &dev->hp_txq,
				QE_CMD_TX_PURGE_INH | /*QE_CMD_IMM_INQ|*/ vcc->channo, 0,0,0);
		clear_bit (vcc->channo, dev->tx_inuse);
	}

	if (DO_DIRECTION (rxtp)) {
		submit_command (dev,  &dev->hp_txq,
				QE_CMD_RX_PURGE_INH | QE_CMD_IMM_INQ | vcc->channo, 0,0,0);
		dev->atm_vccs [vcc->channo] = NULL;
  
		/* This means that this is configured as a receive channel */
		if (IS_FS50 (dev)) {
			/* Disable the receive filter. Is 0/0 indeed an invalid receive
			   channel? -- REW.  Yes it is. -- Hang. Ok. I'll use -1
			   (0xfff...) -- REW */
			submit_command (dev, &dev->hp_txq, 
					QE_CMD_REG_WR | QE_CMD_IMM_INQ,
					0x80 + vcc->channo, -1, 0 ); 
		}
	}

	fs_dprintk (FS_DEBUG_ALLOC, "Free vcc: %p\n", vcc);
	kfree (vcc);

	func_exit ();
}


static int fs_send (struct atm_vcc *atm_vcc, struct sk_buff *skb)
{
	struct fs_dev *dev = FS_DEV (atm_vcc->dev);
	struct fs_vcc *vcc = FS_VCC (atm_vcc);
	struct FS_BPENTRY *td;

	func_enter ();

	fs_dprintk (FS_DEBUG_TXMEM, "I");
	fs_dprintk (FS_DEBUG_SEND, "Send: atm_vcc %p skb %p vcc %p dev %p\n", 
		    atm_vcc, skb, vcc, dev);

	fs_dprintk (FS_DEBUG_ALLOC, "Alloc t-skb: %p (atm_send)\n", skb);

	ATM_SKB(skb)->vcc = atm_vcc;

	vcc->last_skb = skb;

	td = kmalloc (sizeof (struct FS_BPENTRY), GFP_ATOMIC);
	fs_dprintk (FS_DEBUG_ALLOC, "Alloc transd: %p(%Zd)\n", td, sizeof (struct FS_BPENTRY));
	if (!td) {
		/* Oops out of mem */
		return -ENOMEM;
	}

	fs_dprintk (FS_DEBUG_SEND, "first word in buffer: %x\n", 
		    *(int *) skb->data);

	td->flags =  TD_EPI | TD_DATA | skb->len;
	td->next = 0;
	td->bsa  = virt_to_bus (skb->data);
	td->skb = skb;
	td->dev = dev;
	dev->ntxpckts++;

#ifdef DEBUG_EXTRA
	da[qd] = td;
	dq[qd].flags = td->flags;
	dq[qd].next  = td->next;
	dq[qd].bsa   = td->bsa;
	dq[qd].skb   = td->skb;
	dq[qd].dev   = td->dev;
	qd++;
	if (qd >= 60) qd = 0;
#endif

	submit_queue (dev, &dev->hp_txq, 
		      QE_TRANSMIT_DE | vcc->channo,
		      virt_to_bus (td), 0, 
		      virt_to_bus (td));

	fs_dprintk (FS_DEBUG_QUEUE, "in send: txq %d txrq %d\n", 
		    read_fs (dev, Q_EA (dev->hp_txq.offset)) -
		    read_fs (dev, Q_SA (dev->hp_txq.offset)),
		    read_fs (dev, Q_EA (dev->tx_relq.offset)) -
		    read_fs (dev, Q_SA (dev->tx_relq.offset)));

	func_exit ();
	return 0;
}


/* Some function placeholders for functions we don't yet support. */

#if 0
static int fs_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
{
	func_enter ();
	func_exit ();
	return -ENOIOCTLCMD;
}


static int fs_getsockopt(struct atm_vcc *vcc,int level,int optname,
			 void __user *optval,int optlen)
{
	func_enter ();
	func_exit ();
	return 0;
}


static int fs_setsockopt(struct atm_vcc *vcc,int level,int optname,
			 void __user *optval,unsigned int optlen)
{
	func_enter ();
	func_exit ();
	return 0;
}


static void fs_phy_put(struct atm_dev *dev,unsigned char value,
		       unsigned long addr)
{
	func_enter ();
	func_exit ();
}


static unsigned char fs_phy_get(struct atm_dev *dev,unsigned long addr)
{
	func_enter ();
	func_exit ();
	return 0;
}


static int fs_change_qos(struct atm_vcc *vcc,struct atm_qos *qos,int flags)
{
	func_enter ();
	func_exit ();
	return 0;
};

#endif


static const struct atmdev_ops ops = {
	.open =         fs_open,
	.close =        fs_close,
	.send =         fs_send,
	.owner =        THIS_MODULE,
	/* ioctl:          fs_ioctl, */
	/* getsockopt:     fs_getsockopt, */
	/* setsockopt:     fs_setsockopt, */
	/* change_qos:     fs_change_qos, */

	/* For now implement these internally here... */  
	/* phy_put:        fs_phy_put, */
	/* phy_get:        fs_phy_get, */
};


static void __devinit undocumented_pci_fix (struct pci_dev *pdev)
{
	u32 tint;

	/* The Windows driver says: */
	/* Switch off FireStream Retry Limit Threshold 
	 */

	/* The register at 0x28 is documented as "reserved", no further
	   comments. */

	pci_read_config_dword (pdev, 0x28, &tint);
	if (tint != 0x80) {
		tint = 0x80;
		pci_write_config_dword (pdev, 0x28, tint);
	}
}



/**************************************************************************
 *                              PHY routines                              *
 **************************************************************************/

static void __devinit write_phy (struct fs_dev *dev, int regnum, int val)
{
	submit_command (dev,  &dev->hp_txq, QE_CMD_PRP_WR | QE_CMD_IMM_INQ,
			regnum, val, 0);
}

static int __devinit init_phy (struct fs_dev *dev, struct reginit_item *reginit)
{
	int i;

	func_enter ();
	while (reginit->reg != PHY_EOF) {
		if (reginit->reg == PHY_CLEARALL) {
			/* "PHY_CLEARALL means clear all registers. Numregisters is in "val". */
			for (i=0;i<reginit->val;i++) {
				write_phy (dev, i, 0);
			}
		} else {
			write_phy (dev, reginit->reg, reginit->val);
		}
		reginit++;
	}
	func_exit ();
	return 0;
}

static void reset_chip (struct fs_dev *dev)
{
	int i;

	write_fs (dev, SARMODE0, SARMODE0_SRTS0);

	/* Undocumented delay */
	udelay (128);

	/* The "internal registers are documented to all reset to zero, but 
	   comments & code in the Windows driver indicates that the pools are
	   NOT reset. */
	for (i=0;i < FS_NR_FREE_POOLS;i++) {
		write_fs (dev, FP_CNF (RXB_FP(i)), 0);
		write_fs (dev, FP_SA  (RXB_FP(i)), 0);
		write_fs (dev, FP_EA  (RXB_FP(i)), 0);
		write_fs (dev, FP_CNT (RXB_FP(i)), 0);
		write_fs (dev, FP_CTU (RXB_FP(i)), 0);
	}

	/* The same goes for the match channel registers, although those are
	   NOT documented that way in the Windows driver. -- REW */
	/* The Windows driver DOES write 0 to these registers somewhere in
	   the init sequence. However, a small hardware-feature, will
	   prevent reception of data on VPI/VCI = 0/0 (Unless the channel
	   allocated happens to have no disabled channels that have a lower
	   number. -- REW */

	/* Clear the match channel registers. */
	if (IS_FS50 (dev)) {
		for (i=0;i<FS50_NR_CHANNELS;i++) {
			write_fs (dev, 0x200 + i * 4, -1);
		}
	}
}

static void __devinit *aligned_kmalloc (int size, gfp_t flags, int alignment)
{
	void  *t;

	if (alignment <= 0x10) {
		t = kmalloc (size, flags);
		if ((unsigned long)t & (alignment-1)) {
			printk ("Kmalloc doesn't align things correctly! %p\n", t);
			kfree (t);
			return aligned_kmalloc (size, flags, alignment * 4);
		}
		return t;
	}
	printk (KERN_ERR "Request for > 0x10 alignment not yet implemented (hard!)\n");
	return NULL;
}

static int __devinit init_q (struct fs_dev *dev, 
			  struct queue *txq, int queue, int nentries, int is_rq)
{
	int sz = nentries * sizeof (struct FS_QENTRY);
	struct FS_QENTRY *p;

	func_enter ();

	fs_dprintk (FS_DEBUG_INIT, "Inititing queue at %x: %d entries:\n", 
		    queue, nentries);

	p = aligned_kmalloc (sz, GFP_KERNEL, 0x10);
	fs_dprintk (FS_DEBUG_ALLOC, "Alloc queue: %p(%d)\n", p, sz);

	if (!p) return 0;

	write_fs (dev, Q_SA(queue), virt_to_bus(p));
	write_fs (dev, Q_EA(queue), virt_to_bus(p+nentries-1));
	write_fs (dev, Q_WP(queue), virt_to_bus(p));
	write_fs (dev, Q_RP(queue), virt_to_bus(p));
	if (is_rq) {
		/* Configuration for the receive queue: 0: interrupt immediately,
		   no pre-warning to empty queues: We do our best to keep the
		   queue filled anyway. */
		write_fs (dev, Q_CNF(queue), 0 ); 
	}

	txq->sa = p;
	txq->ea = p;
	txq->offset = queue; 

	func_exit ();
	return 1;
}


static int __devinit init_fp (struct fs_dev *dev, 
			   struct freepool *fp, int queue, int bufsize, int nr_buffers)
{
	func_enter ();

	fs_dprintk (FS_DEBUG_INIT, "Inititing free pool at %x:\n", queue);

	write_fs (dev, FP_CNF(queue), (bufsize * RBFP_RBS) | RBFP_RBSVAL | RBFP_CME);
	write_fs (dev, FP_SA(queue),  0);
	write_fs (dev, FP_EA(queue),  0);
	write_fs (dev, FP_CTU(queue), 0);
	write_fs (dev, FP_CNT(queue), 0);

	fp->offset = queue; 
	fp->bufsize = bufsize;
	fp->nr_buffers = nr_buffers;

	func_exit ();
	return 1;
}


static inline int nr_buffers_in_freepool (struct fs_dev *dev, struct freepool *fp)
{
#if 0
	/* This seems to be unreliable.... */
	return read_fs (dev, FP_CNT (fp->offset));
#else
	return fp->n;
#endif
}


/* Check if this gets going again if a pool ever runs out.  -- Yes, it
   does. I've seen "receive abort: no buffers" and things started
   working again after that...  -- REW */

static void top_off_fp (struct fs_dev *dev, struct freepool *fp,
			gfp_t gfp_flags)
{
	struct FS_BPENTRY *qe, *ne;
	struct sk_buff *skb;
	int n = 0;
	u32 qe_tmp;

	fs_dprintk (FS_DEBUG_QUEUE, "Topping off queue at %x (%d-%d/%d)\n", 
		    fp->offset, read_fs (dev, FP_CNT (fp->offset)), fp->n, 
		    fp->nr_buffers);
	while (nr_buffers_in_freepool(dev, fp) < fp->nr_buffers) {

		skb = alloc_skb (fp->bufsize, gfp_flags);
		fs_dprintk (FS_DEBUG_ALLOC, "Alloc rec-skb: %p(%d)\n", skb, fp->bufsize);
		if (!skb) break;
		ne = kmalloc (sizeof (struct FS_BPENTRY), gfp_flags);
		fs_dprintk (FS_DEBUG_ALLOC, "Alloc rec-d: %p(%Zd)\n", ne, sizeof (struct FS_BPENTRY));
		if (!ne) {
			fs_dprintk (FS_DEBUG_ALLOC, "Free rec-skb: %p\n", skb);
			dev_kfree_skb_any (skb);
			break;
		}

		fs_dprintk (FS_DEBUG_QUEUE, "Adding skb %p desc %p -> %p(%p) ", 
			    skb, ne, skb->data, skb->head);
		n++;
		ne->flags = FP_FLAGS_EPI | fp->bufsize;
		ne->next  = virt_to_bus (NULL);
		ne->bsa   = virt_to_bus (skb->data);
		ne->aal_bufsize = fp->bufsize;
		ne->skb = skb;
		ne->fp = fp;

		/*
		 * FIXME: following code encodes and decodes
		 * machine pointers (could be 64-bit) into a
		 * 32-bit register.
		 */

		qe_tmp = read_fs (dev, FP_EA(fp->offset));
		fs_dprintk (FS_DEBUG_QUEUE, "link at %x\n", qe_tmp);
		if (qe_tmp) {
			qe = bus_to_virt ((long) qe_tmp);
			qe->next = virt_to_bus(ne);
			qe->flags &= ~FP_FLAGS_EPI;
		} else
			write_fs (dev, FP_SA(fp->offset), virt_to_bus(ne));

		write_fs (dev, FP_EA(fp->offset), virt_to_bus (ne));
		fp->n++;   /* XXX Atomic_inc? */
		write_fs (dev, FP_CTU(fp->offset), 1);
	}

	fs_dprintk (FS_DEBUG_QUEUE, "Added %d entries. \n", n);
}

static void __devexit free_queue (struct fs_dev *dev, struct queue *txq)
{
	func_enter ();

	write_fs (dev, Q_SA(txq->offset), 0);
	write_fs (dev, Q_EA(txq->offset), 0);
	write_fs (dev, Q_RP(txq->offset), 0);
	write_fs (dev, Q_WP(txq->offset), 0);
	/* Configuration ? */

	fs_dprintk (FS_DEBUG_ALLOC, "Free queue: %p\n", txq->sa);
	kfree (txq->sa);

	func_exit ();
}

static void __devexit free_freepool (struct fs_dev *dev, struct freepool *fp)
{
	func_enter ();

	write_fs (dev, FP_CNF(fp->offset), 0);
	write_fs (dev, FP_SA (fp->offset), 0);
	write_fs (dev, FP_EA (fp->offset), 0);
	write_fs (dev, FP_CNT(fp->offset), 0);
	write_fs (dev, FP_CTU(fp->offset), 0);

	func_exit ();
}



static irqreturn_t fs_irq (int irq, void *dev_id) 
{
	int i;
	u32 status;
	struct fs_dev *dev = dev_id;

	status = read_fs (dev, ISR);
	if (!status)
		return IRQ_NONE;

	func_enter ();

#ifdef IRQ_RATE_LIMIT
	/* Aaargh! I'm ashamed. This costs more lines-of-code than the actual 
	   interrupt routine!. (Well, used to when I wrote that comment) -- REW */
	{
		static int lastjif;
		static int nintr=0;
    
		if (lastjif == jiffies) {
			if (++nintr > IRQ_RATE_LIMIT) {
				free_irq (dev->irq, dev_id);
				printk (KERN_ERR "fs: Too many interrupts. Turning off interrupt %d.\n", 
					dev->irq);
			}
		} else {
			lastjif = jiffies;
			nintr = 0;
		}
	}
#endif
	fs_dprintk (FS_DEBUG_QUEUE, "in intr: txq %d txrq %d\n", 
		    read_fs (dev, Q_EA (dev->hp_txq.offset)) -
		    read_fs (dev, Q_SA (dev->hp_txq.offset)),
		    read_fs (dev, Q_EA (dev->tx_relq.offset)) -
		    read_fs (dev, Q_SA (dev->tx_relq.offset)));

	/* print the bits in the ISR register. */
	if (fs_debug & FS_DEBUG_IRQ) {
		/* The FS_DEBUG things are unnecessary here. But this way it is
		   clear for grep that these are debug prints. */
		fs_dprintk (FS_DEBUG_IRQ,  "IRQ status:");
		for (i=0;i<27;i++) 
			if (status & (1 << i)) 
				fs_dprintk (FS_DEBUG_IRQ, " %s", irq_bitname[i]);
		fs_dprintk (FS_DEBUG_IRQ, "\n");
	}
  
	if (status & ISR_RBRQ0_W) {
		fs_dprintk (FS_DEBUG_IRQ, "Iiiin-coming (0)!!!!\n");
		process_incoming (dev, &dev->rx_rq[0]);
		/* items mentioned on RBRQ0 are from FP 0 or 1. */
		top_off_fp (dev, &dev->rx_fp[0], GFP_ATOMIC);
		top_off_fp (dev, &dev->rx_fp[1], GFP_ATOMIC);
	}

	if (status & ISR_RBRQ1_W) {
		fs_dprintk (FS_DEBUG_IRQ, "Iiiin-coming (1)!!!!\n");
		process_incoming (dev, &dev->rx_rq[1]);
		top_off_fp (dev, &dev->rx_fp[2], GFP_ATOMIC);
		top_off_fp (dev, &dev->rx_fp[3], GFP_ATOMIC);
	}

	if (status & ISR_RBRQ2_W) {
		fs_dprintk (FS_DEBUG_IRQ, "Iiiin-coming (2)!!!!\n");
		process_incoming (dev, &dev->rx_rq[2]);
		top_off_fp (dev, &dev->rx_fp[4], GFP_ATOMIC);
		top_off_fp (dev, &dev->rx_fp[5], GFP_ATOMIC);
	}

	if (status & ISR_RBRQ3_W) {
		fs_dprintk (FS_DEBUG_IRQ, "Iiiin-coming (3)!!!!\n");
		process_incoming (dev, &dev->rx_rq[3]);
		top_off_fp (dev, &dev->rx_fp[6], GFP_ATOMIC);
		top_off_fp (dev, &dev->rx_fp[7], GFP_ATOMIC);
	}

	if (status & ISR_CSQ_W) {
		fs_dprintk (FS_DEBUG_IRQ, "Command executed ok!\n");
		process_return_queue (dev, &dev->st_q);
	}

	if (status & ISR_TBRQ_W) {
		fs_dprintk (FS_DEBUG_IRQ, "Data tramsitted!\n");
		process_txdone_queue (dev, &dev->tx_relq);
	}

	func_exit ();
	return IRQ_HANDLED;
}


#ifdef FS_POLL_FREQ
static void fs_poll (unsigned long data)
{
	struct fs_dev *dev = (struct fs_dev *) data;
  
	fs_irq (0, dev);
	dev->timer.expires = jiffies + FS_POLL_FREQ;
	add_timer (&dev->timer);
}
#endif

static int __devinit fs_init (struct fs_dev *dev)
{
	struct pci_dev  *pci_dev;
	int isr, to;
	int i;

	func_enter ();
	pci_dev = dev->pci_dev;

	printk (KERN_INFO "found a FireStream %d card, base %16llx, irq%d.\n",
		IS_FS50(dev)?50:155,
		(unsigned long long)pci_resource_start(pci_dev, 0),
		dev->pci_dev->irq);

	if (fs_debug & FS_DEBUG_INIT)
		my_hd ((unsigned char *) dev, sizeof (*dev));

	undocumented_pci_fix (pci_dev);

	dev->hw_base = pci_resource_start(pci_dev, 0);

	dev->base = ioremap(dev->hw_base, 0x1000);

	reset_chip (dev);
  
	write_fs (dev, SARMODE0, 0 
		  | (0 * SARMODE0_SHADEN) /* We don't use shadow registers. */
		  | (1 * SARMODE0_INTMODE_READCLEAR)
		  | (1 * SARMODE0_CWRE)
		  | (IS_FS50(dev) ? SARMODE0_PRPWT_FS50_5:
			  SARMODE0_PRPWT_FS155_3)
		  | (1 * SARMODE0_CALSUP_1)
		  | (IS_FS50(dev) ? (0
				   | SARMODE0_RXVCS_32
				   | SARMODE0_ABRVCS_32 
				   | SARMODE0_TXVCS_32):
		                  (0
				   | SARMODE0_RXVCS_1k
				   | SARMODE0_ABRVCS_1k 
				   | SARMODE0_TXVCS_1k)));

	/* 10ms * 100 is 1 second. That should be enough, as AN3:9 says it takes
	   1ms. */
	to = 100;
	while (--to) {
		isr = read_fs (dev, ISR);

		/* This bit is documented as "RESERVED" */
		if (isr & ISR_INIT_ERR) {
			printk (KERN_ERR "Error initializing the FS... \n");
			goto unmap;
		}
		if (isr & ISR_INIT) {
			fs_dprintk (FS_DEBUG_INIT, "Ha! Initialized OK!\n");
			break;
		}

		/* Try again after 10ms. */
		msleep(10);
	}

	if (!to) {
		printk (KERN_ERR "timeout initializing the FS... \n");
		goto unmap;
	}

	/* XXX fix for fs155 */
	dev->channel_mask = 0x1f; 
	dev->channo = 0;

	/* AN3: 10 */
	write_fs (dev, SARMODE1, 0 
		  | (fs_keystream * SARMODE1_DEFHEC) /* XXX PHY */
		  | ((loopback == 1) * SARMODE1_TSTLP) /* XXX Loopback mode enable... */
		  | (1 * SARMODE1_DCRM)
		  | (1 * SARMODE1_DCOAM)
		  | (0 * SARMODE1_OAMCRC)
		  | (0 * SARMODE1_DUMPE)
		  | (0 * SARMODE1_GPLEN) 
		  | (0 * SARMODE1_GNAM)
		  | (0 * SARMODE1_GVAS)
		  | (0 * SARMODE1_GPAS)
		  | (1 * SARMODE1_GPRI)
		  | (0 * SARMODE1_PMS)
		  | (0 * SARMODE1_GFCR)
		  | (1 * SARMODE1_HECM2)
		  | (1 * SARMODE1_HECM1)
		  | (1 * SARMODE1_HECM0)
		  | (1 << 12) /* That's what hang's driver does. Program to 0 */
		  | (0 * 0xff) /* XXX FS155 */);


	/* Cal prescale etc */

	/* AN3: 11 */
	write_fs (dev, TMCONF, 0x0000000f);
	write_fs (dev, CALPRESCALE, 0x01010101 * num);
	write_fs (dev, 0x80, 0x000F00E4);

	/* AN3: 12 */
	write_fs (dev, CELLOSCONF, 0
		  | (   0 * CELLOSCONF_CEN)
		  | (       CELLOSCONF_SC1)
		  | (0x80 * CELLOSCONF_COBS)
		  | (num  * CELLOSCONF_COPK)  /* Changed from 0xff to 0x5a */
		  | (num  * CELLOSCONF_COST));/* after a hint from Hang. 
					       * performance jumped 50->70... */

	/* Magic value by Hang */
	write_fs (dev, CELLOSCONF_COST, 0x0B809191);

	if (IS_FS50 (dev)) {
		write_fs (dev, RAS0, RAS0_DCD_XHLT);
		dev->atm_dev->ci_range.vpi_bits = 12;
		dev->atm_dev->ci_range.vci_bits = 16;
		dev->nchannels = FS50_NR_CHANNELS;
	} else {
		write_fs (dev, RAS0, RAS0_DCD_XHLT 
			  | (((1 << FS155_VPI_BITS) - 1) * RAS0_VPSEL)
			  | (((1 << FS155_VCI_BITS) - 1) * RAS0_VCSEL));
		/* We can chose the split arbitarily. We might be able to 
		   support more. Whatever. This should do for now. */
		dev->atm_dev->ci_range.vpi_bits = FS155_VPI_BITS;
		dev->atm_dev->ci_range.vci_bits = FS155_VCI_BITS;
    
		/* Address bits we can't use should be compared to 0. */
		write_fs (dev, RAC, 0);

		/* Manual (AN9, page 6) says ASF1=0 means compare Utopia address
		 * too.  I can't find ASF1 anywhere. Anyway, we AND with just the
		 * other bits, then compare with 0, which is exactly what we
		 * want. */
		write_fs (dev, RAM, (1 << (28 - FS155_VPI_BITS - FS155_VCI_BITS)) - 1);
		dev->nchannels = FS155_NR_CHANNELS;
	}
	dev->atm_vccs = kcalloc (dev->nchannels, sizeof (struct atm_vcc *),
				 GFP_KERNEL);
	fs_dprintk (FS_DEBUG_ALLOC, "Alloc atmvccs: %p(%Zd)\n",
		    dev->atm_vccs, dev->nchannels * sizeof (struct atm_vcc *));

	if (!dev->atm_vccs) {
		printk (KERN_WARNING "Couldn't allocate memory for VCC buffers. Woops!\n");
		/* XXX Clean up..... */
		goto unmap;
	}

	dev->tx_inuse = kzalloc (dev->nchannels / 8 /* bits/byte */ , GFP_KERNEL);
	fs_dprintk (FS_DEBUG_ALLOC, "Alloc tx_inuse: %p(%d)\n", 
		    dev->atm_vccs, dev->nchannels / 8);

	if (!dev->tx_inuse) {
		printk (KERN_WARNING "Couldn't allocate memory for tx_inuse bits!\n");
		/* XXX Clean up..... */
		goto unmap;
	}
	/* -- RAS1 : FS155 and 50 differ. Default (0) should be OK for both */
	/* -- RAS2 : FS50 only: Default is OK. */

	/* DMAMODE, default should be OK. -- REW */
	write_fs (dev, DMAMR, DMAMR_TX_MODE_FULL);

	init_q (dev, &dev->hp_txq, TX_PQ(TXQ_HP), TXQ_NENTRIES, 0);
	init_q (dev, &dev->lp_txq, TX_PQ(TXQ_LP), TXQ_NENTRIES, 0);
	init_q (dev, &dev->tx_relq, TXB_RQ, TXQ_NENTRIES, 1);
	init_q (dev, &dev->st_q, ST_Q, TXQ_NENTRIES, 1);

	for (i=0;i < FS_NR_FREE_POOLS;i++) {
		init_fp (dev, &dev->rx_fp[i], RXB_FP(i), 
			 rx_buf_sizes[i], rx_pool_sizes[i]);
		top_off_fp (dev, &dev->rx_fp[i], GFP_KERNEL);
	}


	for (i=0;i < FS_NR_RX_QUEUES;i++)
		init_q (dev, &dev->rx_rq[i], RXB_RQ(i), RXRQ_NENTRIES, 1);

	dev->irq = pci_dev->irq;
	if (request_irq (dev->irq, fs_irq, IRQF_SHARED, "firestream", dev)) {
		printk (KERN_WARNING "couldn't get irq %d for firestream.\n", pci_dev->irq);
		/* XXX undo all previous stuff... */
		goto unmap;
	}
	fs_dprintk (FS_DEBUG_INIT, "Grabbed irq %d for dev at %p.\n", dev->irq, dev);
  
	/* We want to be notified of most things. Just the statistics count
	   overflows are not interesting */
	write_fs (dev, IMR, 0
		  | ISR_RBRQ0_W 
		  | ISR_RBRQ1_W 
		  | ISR_RBRQ2_W 
		  | ISR_RBRQ3_W 
		  | ISR_TBRQ_W
		  | ISR_CSQ_W);

	write_fs (dev, SARMODE0, 0 
		  | (0 * SARMODE0_SHADEN) /* We don't use shadow registers. */
		  | (1 * SARMODE0_GINT)
		  | (1 * SARMODE0_INTMODE_READCLEAR)
		  | (0 * SARMODE0_CWRE)
		  | (IS_FS50(dev)?SARMODE0_PRPWT_FS50_5: 
		                  SARMODE0_PRPWT_FS155_3)
		  | (1 * SARMODE0_CALSUP_1)
		  | (IS_FS50 (dev)?(0
				    | SARMODE0_RXVCS_32
				    | SARMODE0_ABRVCS_32 
				    | SARMODE0_TXVCS_32):
		                   (0
				    | SARMODE0_RXVCS_1k
				    | SARMODE0_ABRVCS_1k 
				    | SARMODE0_TXVCS_1k))
		  | (1 * SARMODE0_RUN));

	init_phy (dev, PHY_NTC_INIT);

	if (loopback == 2) {
		write_phy (dev, 0x39, 0x000e);
	}

#ifdef FS_POLL_FREQ
	init_timer (&dev->timer);
	dev->timer.data = (unsigned long) dev;
	dev->timer.function = fs_poll;
	dev->timer.expires = jiffies + FS_POLL_FREQ;
	add_timer (&dev->timer);
#endif

	dev->atm_dev->dev_data = dev;
  
	func_exit ();
	return 0;
unmap:
	iounmap(dev->base);
	return 1;
}

static int __devinit firestream_init_one (struct pci_dev *pci_dev,
				       const struct pci_device_id *ent) 
{
	struct atm_dev *atm_dev;
	struct fs_dev *fs_dev;
	
	if (pci_enable_device(pci_dev)) 
		goto err_out;

	fs_dev = kzalloc (sizeof (struct fs_dev), GFP_KERNEL);
	fs_dprintk (FS_DEBUG_ALLOC, "Alloc fs-dev: %p(%Zd)\n",
		    fs_dev, sizeof (struct fs_dev));
	if (!fs_dev)
		goto err_out;
	atm_dev = atm_dev_register("fs", &ops, -1, NULL);
	if (!atm_dev)
		goto err_out_free_fs_dev;
  
	fs_dev->pci_dev = pci_dev;
	fs_dev->atm_dev = atm_dev;
	fs_dev->flags = ent->driver_data;

	if (fs_init(fs_dev))
		goto err_out_free_atm_dev;

	fs_dev->next = fs_boards;
	fs_boards = fs_dev;
	return 0;

 err_out_free_atm_dev:
	atm_dev_deregister(atm_dev);
 err_out_free_fs_dev:
 	kfree(fs_dev);
 err_out:
	return -ENODEV;
}

static void __devexit firestream_remove_one (struct pci_dev *pdev)
{
	int i;
	struct fs_dev *dev, *nxtdev;
	struct fs_vcc *vcc;
	struct FS_BPENTRY *fp, *nxt;
  
	func_enter ();

#if 0
	printk ("hptxq:\n");
	for (i=0;i<60;i++) {
		printk ("%d: %08x %08x %08x %08x \n", 
			i, pq[qp].cmd, pq[qp].p0, pq[qp].p1, pq[qp].p2);
		qp++;
		if (qp >= 60) qp = 0;
	}

	printk ("descriptors:\n");
	for (i=0;i<60;i++) {
		printk ("%d: %p: %08x %08x %p %p\n", 
			i, da[qd], dq[qd].flags, dq[qd].bsa, dq[qd].skb, dq[qd].dev);
		qd++;
		if (qd >= 60) qd = 0;
	}
#endif

	for (dev = fs_boards;dev != NULL;dev=nxtdev) {
		fs_dprintk (FS_DEBUG_CLEANUP, "Releasing resources for dev at %p.\n", dev);

		/* XXX Hit all the tx channels too! */

		for (i=0;i < dev->nchannels;i++) {
			if (dev->atm_vccs[i]) {
				vcc = FS_VCC (dev->atm_vccs[i]);
				submit_command (dev,  &dev->hp_txq,
						QE_CMD_TX_PURGE_INH | QE_CMD_IMM_INQ | vcc->channo, 0,0,0);
				submit_command (dev,  &dev->hp_txq,
						QE_CMD_RX_PURGE_INH | QE_CMD_IMM_INQ | vcc->channo, 0,0,0);

			}
		}

		/* XXX Wait a while for the chip to release all buffers. */

		for (i=0;i < FS_NR_FREE_POOLS;i++) {
			for (fp=bus_to_virt (read_fs (dev, FP_SA(dev->rx_fp[i].offset)));
			     !(fp->flags & FP_FLAGS_EPI);fp = nxt) {
				fs_dprintk (FS_DEBUG_ALLOC, "Free rec-skb: %p\n", fp->skb);
				dev_kfree_skb_any (fp->skb);
				nxt = bus_to_virt (fp->next);
				fs_dprintk (FS_DEBUG_ALLOC, "Free rec-d: %p\n", fp);
				kfree (fp);
			}
			fs_dprintk (FS_DEBUG_ALLOC, "Free rec-skb: %p\n", fp->skb);
			dev_kfree_skb_any (fp->skb);
			fs_dprintk (FS_DEBUG_ALLOC, "Free rec-d: %p\n", fp);
			kfree (fp);
		}

		/* Hang the chip in "reset", prevent it clobbering memory that is
		   no longer ours. */
		reset_chip (dev);

		fs_dprintk (FS_DEBUG_CLEANUP, "Freeing irq%d.\n", dev->irq);
		free_irq (dev->irq, dev);
		del_timer (&dev->timer);

		atm_dev_deregister(dev->atm_dev);
		free_queue (dev, &dev->hp_txq);
		free_queue (dev, &dev->lp_txq);
		free_queue (dev, &dev->tx_relq);
		free_queue (dev, &dev->st_q);

		fs_dprintk (FS_DEBUG_ALLOC, "Free atmvccs: %p\n", dev->atm_vccs);
		kfree (dev->atm_vccs);

		for (i=0;i< FS_NR_FREE_POOLS;i++)
			free_freepool (dev, &dev->rx_fp[i]);
    
		for (i=0;i < FS_NR_RX_QUEUES;i++)
			free_queue (dev, &dev->rx_rq[i]);

		iounmap(dev->base);
		fs_dprintk (FS_DEBUG_ALLOC, "Free fs-dev: %p\n", dev);
		nxtdev = dev->next;
		kfree (dev);
	}

	func_exit ();
}

static struct pci_device_id firestream_pci_tbl[] = {
	{ PCI_VENDOR_ID_FUJITSU_ME, PCI_DEVICE_ID_FUJITSU_FS50, 
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, FS_IS50},
	{ PCI_VENDOR_ID_FUJITSU_ME, PCI_DEVICE_ID_FUJITSU_FS155, 
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, FS_IS155},
	{ 0, }
};

MODULE_DEVICE_TABLE(pci, firestream_pci_tbl);

static struct pci_driver firestream_driver = {
	.name		= "firestream",
	.id_table	= firestream_pci_tbl,
	.probe		= firestream_init_one,
	.remove		= __devexit_p(firestream_remove_one),
};

static int __init firestream_init_module (void)
{
	int error;

	func_enter ();
	error = pci_register_driver(&firestream_driver);
	func_exit ();
	return error;
}

static void __exit firestream_cleanup_module(void)
{
	pci_unregister_driver(&firestream_driver);
}

module_init(firestream_init_module);
module_exit(firestream_cleanup_module);

MODULE_LICENSE("GPL");