summaryrefslogtreecommitdiff
path: root/drivers/char/sx.c
blob: a6b4f02bdceb06ba347d5241f6b479eacecbb36a (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
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620

/* sx.c -- driver for the Specialix SX series cards. 
 *
 *  This driver will also support the older SI, and XIO cards.
 *
 *
 *   (C) 1998 - 2004  R.E.Wolff@BitWizard.nl
 *
 *  Simon Allen (simonallen@cix.compulink.co.uk) wrote a previous
 *  version of this driver. Some fragments may have been copied. (none
 *  yet :-)
 *
 * Specialix pays for the development and support of this driver.
 * Please DO contact support@specialix.co.uk if you require
 * support. But please read the documentation (sx.txt) first.
 *
 *
 *
 *      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., 675 Mass Ave, Cambridge, MA 02139,
 *      USA.
 *
 * Revision history:
 * $Log: sx.c,v $
 * Revision 1.33  2000/03/09 10:00:00  pvdl,wolff
 * - Fixed module and port counting
 * - Fixed signal handling
 * - Fixed an Ooops
 * 
 * Revision 1.32  2000/03/07 09:00:00  wolff,pvdl
 * - Fixed some sx_dprintk typos
 * - added detection for an invalid board/module configuration
 *
 * Revision 1.31  2000/03/06 12:00:00  wolff,pvdl
 * - Added support for EISA
 *
 * Revision 1.30  2000/01/21 17:43:06  wolff
 * - Added support for SX+
 *
 * Revision 1.26  1999/08/05 15:22:14  wolff
 * - Port to 2.3.x
 * - Reformatted to Linus' liking.
 *
 * Revision 1.25  1999/07/30 14:24:08  wolff
 * Had accidentally left "gs_debug" set to "-1" instead of "off" (=0).
 *
 * Revision 1.24  1999/07/28 09:41:52  wolff
 * - I noticed the remark about use-count straying in sx.txt. I checked
 *   sx_open, and found a few places where that could happen. I hope it's
 *   fixed now.
 *
 * Revision 1.23  1999/07/28 08:56:06  wolff
 * - Fixed crash when sx_firmware run twice.
 * - Added sx_slowpoll as a module parameter (I guess nobody really wanted
 *   to change it from the default... )
 * - Fixed a stupid editing problem I introduced in 1.22.
 * - Fixed dropping characters on a termios change.
 *
 * Revision 1.22  1999/07/26 21:01:43  wolff
 * Russell Brown noticed that I had overlooked 4 out of six modem control
 * signals in sx_getsignals. Ooops.
 *
 * Revision 1.21  1999/07/23 09:11:33  wolff
 * I forgot to free dynamically allocated memory when the driver is unloaded.
 *
 * Revision 1.20  1999/07/20 06:25:26  wolff
 * The "closing wait" wasn't honoured. Thanks to James Griffiths for
 * reporting this.
 *
 * Revision 1.19  1999/07/11 08:59:59  wolff
 * Fixed an oops in close, when an open was pending. Changed the memtest
 * a bit. Should also test the board in word-mode, however my card fails the
 * memtest then. I still have to figure out what is wrong...
 *
 * Revision 1.18  1999/06/10 09:38:42  wolff
 * Changed the format of the firmware revision from %04x to %x.%02x .
 *
 * Revision 1.17  1999/06/04 09:44:35  wolff
 * fixed problem: reference to pci stuff when config_pci was off...
 * Thanks to Jorge Novo for noticing this.
 *
 * Revision 1.16  1999/06/02 08:30:15  wolff
 * added/removed the workaround for the DCD bug in the Firmware.
 * A bit more debugging code to locate that...
 *
 * Revision 1.15  1999/06/01 11:35:30  wolff
 * when DCD is left low (floating?), on TA's the firmware first tells us
 * that DCD is high, but after a short while suddenly comes to the
 * conclusion that it is low. All this would be fine, if it weren't that
 * Unix requires us to send a "hangup" signal in that case. This usually
 * all happens BEFORE the program has had a chance to ioctl the device
 * into clocal mode..
 *
 * Revision 1.14  1999/05/25 11:18:59  wolff
 * Added PCI-fix.
 * Added checks for return code of sx_sendcommand.
 * Don't issue "reconfig" if port isn't open yet. (bit us on TA modules...)
 *
 * Revision 1.13  1999/04/29 15:18:01  wolff
 * Fixed an "oops" that showed on SuSE 6.0 systems.
 * Activate DTR again after stty 0.
 *
 * Revision 1.12  1999/04/29 07:49:52  wolff
 * Improved "stty 0" handling a bit. (used to change baud to 9600 assuming
 *     the connection would be dropped anyway. That is not always the case,
 *     and confuses people).
 * Told the card to always monitor the modem signals.
 * Added support for dynamic  gs_debug adjustments.
 * Now tells the rest of the system the number of ports.
 *
 * Revision 1.11  1999/04/24 11:11:30  wolff
 * Fixed two stupid typos in the memory test.
 *
 * Revision 1.10  1999/04/24 10:53:39  wolff
 * Added some of Christian's suggestions.
 * Fixed an HW_COOK_IN bug (ISIG was not in I_OTHER. We used to trust the
 * card to send the signal to the process.....)
 *
 * Revision 1.9  1999/04/23 07:26:38  wolff
 * Included Christian Lademann's 2.0 compile-warning fixes and interrupt
 *    assignment redesign.
 * Cleanup of some other stuff.
 *
 * Revision 1.8  1999/04/16 13:05:30  wolff
 * fixed a DCD change unnoticed bug.
 *
 * Revision 1.7  1999/04/14 22:19:51  wolff
 * Fixed typo that showed up in 2.0.x builds (get_user instead of Get_user!)
 *
 * Revision 1.6  1999/04/13 18:40:20  wolff
 * changed misc-minor to 161, as assigned by HPA.
 *
 * Revision 1.5  1999/04/13 15:12:25  wolff
 * Fixed use-count leak when "hangup" occurred.
 * Added workaround for a stupid-PCIBIOS bug.
 *
 *
 * Revision 1.4  1999/04/01 22:47:40  wolff
 * Fixed < 1M linux-2.0 problem.
 * (vremap isn't compatible with ioremap in that case)
 *
 * Revision 1.3  1999/03/31 13:45:45  wolff
 * Firmware loading is now done through a separate IOCTL.
 *
 * Revision 1.2  1999/03/28 12:22:29  wolff
 * rcs cleanup
 *
 * Revision 1.1  1999/03/28 12:10:34  wolff
 * Readying for release on 2.0.x (sorry David, 1.01 becomes 1.1 for RCS). 
 *
 * Revision 0.12  1999/03/28 09:20:10  wolff
 * Fixed problem in 0.11, continueing cleanup.
 *
 * Revision 0.11  1999/03/28 08:46:44  wolff
 * cleanup. Not good.
 *
 * Revision 0.10  1999/03/28 08:09:43  wolff
 * Fixed loosing characters on close.
 *
 * Revision 0.9  1999/03/21 22:52:01  wolff
 * Ported back to 2.2.... (minor things)
 *
 * Revision 0.8  1999/03/21 22:40:33  wolff
 * Port to 2.0
 *
 * Revision 0.7  1999/03/21 19:06:34  wolff
 * Fixed hangup processing.
 *
 * Revision 0.6  1999/02/05 08:45:14  wolff
 * fixed real_raw problems. Inclusion into kernel imminent.
 *
 * Revision 0.5  1998/12/21 23:51:06  wolff
 * Snatched a nasty bug: sx_transmit_chars was getting re-entered, and it
 * shouldn't have. THATs why I want to have transmit interrupts even when
 * the buffer is empty.
 *
 * Revision 0.4  1998/12/17 09:34:46  wolff
 * PPP works. ioctl works. Basically works!
 *
 * Revision 0.3  1998/12/15 13:05:18  wolff
 * It works! Wow! Gotta start implementing IOCTL and stuff....
 *
 * Revision 0.2  1998/12/01 08:33:53  wolff
 * moved over to 2.1.130
 *
 * Revision 0.1  1998/11/03 21:23:51  wolff
 * Initial revision. Detects SX card.
 *
 * */


#define RCS_ID "$Id: sx.c,v 1.33 2000/03/08 10:01:02 wolff, pvdl Exp $"
#define RCS_REV "$Revision: 1.33 $"


#include <linux/module.h>
#include <linux/config.h> 
#include <linux/kdev_t.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/mm.h>
#include <linux/serial.h>
#include <linux/fcntl.h>
#include <linux/major.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/miscdevice.h>
#include <linux/bitops.h>

#include <asm/io.h>
#include <asm/uaccess.h>

/* The 3.0.0 version of sxboards/sxwindow.h  uses BYTE and WORD.... */
#define BYTE u8
#define WORD u16

/* .... but the 3.0.4 version uses _u8 and _u16. */
#define _u8 u8
#define _u16 u16

#include "sxboards.h"
#include "sxwindow.h"

#include <linux/generic_serial.h>
#include "sx.h"


/* I don't think that this driver can handle more than 256 ports on
   one machine. You'll have to increase the number of boards in sx.h
   if you want more than 4 boards.  */

#ifndef PCI_DEVICE_ID_SPECIALIX_SX_XIO_IO8
#define PCI_DEVICE_ID_SPECIALIX_SX_XIO_IO8 0x2000
#endif

#ifdef CONFIG_PCI
static struct pci_device_id sx_pci_tbl[] = {
	{ PCI_VENDOR_ID_SPECIALIX, PCI_DEVICE_ID_SPECIALIX_SX_XIO_IO8, PCI_ANY_ID, PCI_ANY_ID },
	{ 0 }
};
MODULE_DEVICE_TABLE(pci, sx_pci_tbl);
#endif /* CONFIG_PCI */

/* Configurable options: 
   (Don't be too sure that it'll work if you toggle them) */

/* Am I paranoid or not ? ;-) */
#undef SX_PARANOIA_CHECK


/* 20 -> 2000 per second. The card should rate-limit interrupts at 100
   Hz, but it is user configurable. I don't recommend going above 1000
   Hz. The interrupt ratelimit might trigger if the interrupt is
   shared with a very active other device. */
#define IRQ_RATE_LIMIT 20

/* Sharing interrupts is possible now. If the other device wants more
   than 2000 interrupts per second, we'd gracefully decline further
   interrupts. That's not what we want. On the other hand, if the
   other device interrupts 2000 times a second, don't use the SX
   interrupt. Use polling. */
#undef IRQ_RATE_LIMIT


#if 0
/* Not implemented */
/* 
 * The following defines are mostly for testing purposes. But if you need
 * some nice reporting in your syslog, you can define them also.
 */
#define SX_REPORT_FIFO
#define SX_REPORT_OVERRUN
#endif 


/* Function prototypes */
static void sx_disable_tx_interrupts (void * ptr); 
static void sx_enable_tx_interrupts (void * ptr); 
static void sx_disable_rx_interrupts (void * ptr); 
static void sx_enable_rx_interrupts (void * ptr); 
static int  sx_get_CD (void * ptr); 
static void sx_shutdown_port (void * ptr);
static int  sx_set_real_termios (void  *ptr);
static void sx_close (void  *ptr);
static int sx_chars_in_buffer (void * ptr);
static int sx_init_board (struct sx_board *board);
static int sx_init_portstructs (int nboards, int nports);
static int sx_fw_ioctl (struct inode *inode, struct file *filp,
                        unsigned int cmd, unsigned long arg);
static int sx_init_drivers(void);


static struct tty_driver *sx_driver;

static struct sx_board boards[SX_NBOARDS];
static struct sx_port *sx_ports;
static int sx_initialized;
static int sx_nports;
static int sx_debug;


/* You can have the driver poll your card. 
    - Set sx_poll to 1 to poll every timer tick (10ms on Intel). 
      This is used when the card cannot use an interrupt for some reason.

    - set sx_slowpoll to 100 to do an extra poll once a second (on Intel). If 
      the driver misses an interrupt (report this if it DOES happen to you!)
      everything will continue to work.... 
 */
static int sx_poll = 1;
static int sx_slowpoll;

/* The card limits the number of interrupts per second. 
   At 115k2 "100" should be sufficient. 
   If you're using higher baudrates, you can increase this...
 */

static int sx_maxints = 100;

/* These are the only open spaces in my computer. Yours may have more
   or less.... -- REW 
   duh: Card at 0xa0000 is possible on HP Netserver?? -- pvdl
*/
static int sx_probe_addrs[]= {0xc0000, 0xd0000, 0xe0000, 
                              0xc8000, 0xd8000, 0xe8000};
static int si_probe_addrs[]= {0xc0000, 0xd0000, 0xe0000, 
                              0xc8000, 0xd8000, 0xe8000, 0xa0000};
static int si1_probe_addrs[]= { 0xd0000};

#define NR_SX_ADDRS ARRAY_SIZE(sx_probe_addrs)
#define NR_SI_ADDRS ARRAY_SIZE(si_probe_addrs)
#define NR_SI1_ADDRS ARRAY_SIZE(si1_probe_addrs)


/* Set the mask to all-ones. This alas, only supports 32 interrupts. 
   Some architectures may need more. */
static int sx_irqmask = -1;

module_param_array(sx_probe_addrs, int, NULL, 0);
module_param_array(si_probe_addrs, int, NULL, 0);
module_param(sx_poll, int, 0);
module_param(sx_slowpoll, int, 0);
module_param(sx_maxints, int, 0);
module_param(sx_debug, int, 0);
module_param(sx_irqmask, int, 0);

MODULE_LICENSE("GPL");

static struct real_driver sx_real_driver = {
	sx_disable_tx_interrupts,
	sx_enable_tx_interrupts,
	sx_disable_rx_interrupts,
	sx_enable_rx_interrupts,
	sx_get_CD,
	sx_shutdown_port, 
	sx_set_real_termios, 
	sx_chars_in_buffer,
	sx_close,
};


/* 
   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... 
*/
#define DEBUG


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



#define func_enter() sx_dprintk (SX_DEBUG_FLOW, "sx: enter %s\n",__FUNCTION__)
#define func_exit()  sx_dprintk (SX_DEBUG_FLOW, "sx: exit  %s\n", __FUNCTION__)

#define func_enter2() sx_dprintk (SX_DEBUG_FLOW, "sx: enter %s (port %d)\n", \
					__FUNCTION__, port->line)




/* 
 *  Firmware loader driver specific routines
 *
 */

static struct file_operations sx_fw_fops = {
	.owner		= THIS_MODULE,
	.ioctl		= sx_fw_ioctl,
};

static struct miscdevice sx_fw_device = {
	SXCTL_MISC_MINOR, "sxctl", &sx_fw_fops
};





#ifdef SX_PARANOIA_CHECK

/* This doesn't work. Who's paranoid around here? Not me! */

static inline int sx_paranoia_check(struct sx_port const * port,
				    char *name, const char *routine)
{

	static const char *badmagic =
	  KERN_ERR "sx: Warning: bad sx port magic number for device %s in %s\n";
	static const char *badinfo =
	  KERN_ERR "sx: Warning: null sx port for device %s in %s\n";
 
	if (!port) {
		printk(badinfo, name, routine);
		return 1;
	}
	if (port->magic != SX_MAGIC) {
		printk(badmagic, name, routine);
		return 1;
	}

	return 0;
}
#else
#define sx_paranoia_check(a,b,c) 0
#endif

/* The timeouts. First try 30 times as fast as possible. Then give
   the card some time to breathe between accesses. (Otherwise the
   processor on the card might not be able to access its OWN bus... */

#define TIMEOUT_1 30
#define TIMEOUT_2 1000000


#ifdef DEBUG
static void my_hd_io(void __iomem *p, int len)
{
	int i, j, ch;
	unsigned char __iomem *addr = p;

	for (i=0;i<len;i+=16) {
		printk ("%p ", addr+i);
		for (j=0;j<16;j++) {
			printk ("%02x %s", readb(addr+j+i), (j==7)?" ":"");
		}
		for (j=0;j<16;j++) {
			ch = readb(addr+j+i);
			printk ("%c", (ch < 0x20)?'.':((ch > 0x7f)?'.':ch));
		}
		printk ("\n");
	}
}
static void my_hd(void *p, int len)
{
	int i, j, ch;
	unsigned char *addr = p;

	for (i=0;i<len;i+=16) {
		printk ("%p ", addr+i);
		for (j=0;j<16;j++) {
			printk ("%02x %s", addr[j+i], (j==7)?" ":"");
		}
		for (j=0;j<16;j++) {
			ch = addr[j+i];
			printk ("%c", (ch < 0x20)?'.':((ch > 0x7f)?'.':ch));
		}
		printk ("\n");
	}
}
#endif



/* This needs redoing for Alpha -- REW -- Done. */

static inline void write_sx_byte (struct sx_board *board, int offset, u8 byte)
{
	writeb (byte, board->base+offset);
}

static inline u8 read_sx_byte (struct sx_board *board, int offset)
{
	return readb (board->base+offset);
}


static inline void write_sx_word (struct sx_board *board, int offset, u16 word)
{
	writew (word, board->base+offset);
}

static inline u16 read_sx_word (struct sx_board *board, int offset)
{
	return readw (board->base + offset);
}


static int sx_busy_wait_eq (struct sx_board *board, 
                     	    int offset, int mask, int correctval)
{
	int i;

	func_enter ();

	for (i=0; i < TIMEOUT_1 ;i++)
		if ((read_sx_byte (board, offset) & mask) == correctval) {
			func_exit ();
			return 1;
		}

	for (i=0; i < TIMEOUT_2 ;i++) {
		if ((read_sx_byte (board, offset) & mask) == correctval) {
			func_exit ();
			return 1;
		}
		udelay (1);
	}

	func_exit ();
	return 0;
}


static int sx_busy_wait_neq (struct sx_board *board, 
                      	     int offset, int mask, int badval)
{
	int i;

	func_enter ();

	for (i=0; i < TIMEOUT_1 ;i++)
		if ((read_sx_byte (board, offset) & mask) != badval) {
			func_exit ();
			return 1;
		}

	for (i=0; i < TIMEOUT_2 ;i++) {
		if ((read_sx_byte (board, offset) & mask) != badval) {
			func_exit ();
			return 1;
		}
		udelay (1);
	}

	func_exit ();
	return 0;
}



/* 5.6.4 of 6210028 r2.3 */
static int sx_reset (struct sx_board *board)
{
	func_enter ();

	if (IS_SX_BOARD (board)) {

		write_sx_byte (board, SX_CONFIG, 0);
		write_sx_byte (board, SX_RESET, 1); /* Value doesn't matter */

		if (!sx_busy_wait_eq (board, SX_RESET_STATUS, 1, 0)) {
			printk (KERN_INFO "sx: Card doesn't respond to reset....\n");
			return 0;
		}
	} else if (IS_EISA_BOARD(board)) {
		outb(board->irq<<4, board->eisa_base+0xc02);
	} else if (IS_SI1_BOARD(board)) {
	        write_sx_byte (board, SI1_ISA_RESET,   0); // value does not matter
	} else {
		/* Gory details of the SI/ISA board */
		write_sx_byte (board, SI2_ISA_RESET,    SI2_ISA_RESET_SET);
		write_sx_byte (board, SI2_ISA_IRQ11,    SI2_ISA_IRQ11_CLEAR);
		write_sx_byte (board, SI2_ISA_IRQ12,    SI2_ISA_IRQ12_CLEAR);
		write_sx_byte (board, SI2_ISA_IRQ15,    SI2_ISA_IRQ15_CLEAR);
		write_sx_byte (board, SI2_ISA_INTCLEAR, SI2_ISA_INTCLEAR_CLEAR);
		write_sx_byte (board, SI2_ISA_IRQSET,   SI2_ISA_IRQSET_CLEAR);
	}

	func_exit ();
	return 1;
}


/* This doesn't work on machines where "NULL" isn't 0 */
/* If you have one of those, someone will need to write 
   the equivalent of this, which will amount to about 3 lines. I don't
   want to complicate this right now. -- REW
   (See, I do write comments every now and then :-) */
#define OFFSETOF(strct, elem) ((long)&(((struct strct *)NULL)->elem))


#define CHAN_OFFSET(port,elem) (port->ch_base + OFFSETOF (_SXCHANNEL, elem))
#define MODU_OFFSET(board,addr,elem)    (addr + OFFSETOF (_SXMODULE, elem))
#define  BRD_OFFSET(board,elem)                (OFFSETOF (_SXCARD, elem))


#define sx_write_channel_byte(port, elem, val) \
   write_sx_byte (port->board, CHAN_OFFSET (port, elem), val)

#define sx_read_channel_byte(port, elem) \
   read_sx_byte (port->board, CHAN_OFFSET (port, elem))

#define sx_write_channel_word(port, elem, val) \
   write_sx_word (port->board, CHAN_OFFSET (port, elem), val)

#define sx_read_channel_word(port, elem) \
   read_sx_word (port->board, CHAN_OFFSET (port, elem))


#define sx_write_module_byte(board, addr, elem, val) \
   write_sx_byte (board, MODU_OFFSET (board, addr, elem), val)

#define sx_read_module_byte(board, addr, elem) \
   read_sx_byte (board, MODU_OFFSET (board, addr, elem))

#define sx_write_module_word(board, addr, elem, val) \
   write_sx_word (board, MODU_OFFSET (board, addr, elem), val)

#define sx_read_module_word(board, addr, elem) \
   read_sx_word (board, MODU_OFFSET (board, addr, elem))


#define sx_write_board_byte(board, elem, val) \
   write_sx_byte (board, BRD_OFFSET (board, elem), val)

#define sx_read_board_byte(board, elem) \
   read_sx_byte (board, BRD_OFFSET (board, elem))

#define sx_write_board_word(board, elem, val) \
   write_sx_word (board, BRD_OFFSET (board, elem), val)

#define sx_read_board_word(board, elem) \
   read_sx_word (board, BRD_OFFSET (board, elem))


static int sx_start_board (struct sx_board *board)
{
	if (IS_SX_BOARD (board)) {
		write_sx_byte (board, SX_CONFIG, SX_CONF_BUSEN);
	} else if (IS_EISA_BOARD(board)) {
		write_sx_byte(board, SI2_EISA_OFF, SI2_EISA_VAL);
		outb((board->irq<<4)|4, board->eisa_base+0xc02);
	} else if (IS_SI1_BOARD(board)) {
		write_sx_byte (board, SI1_ISA_RESET_CLEAR, 0);
		write_sx_byte (board, SI1_ISA_INTCL, 0);
	} else {
		/* Don't bug me about the clear_set. 
		   I haven't the foggiest idea what it's about -- REW */
		write_sx_byte (board, SI2_ISA_RESET,    SI2_ISA_RESET_CLEAR);
		write_sx_byte (board, SI2_ISA_INTCLEAR, SI2_ISA_INTCLEAR_SET);
	}
	return 1;
}

#define SX_IRQ_REG_VAL(board) \
        ((board->flags & SX_ISA_BOARD)?(board->irq << 4):0)

/* Note. The SX register is write-only. Therefore, we have to enable the
   bus too. This is a no-op, if you don't mess with this driver... */
static int sx_start_interrupts (struct sx_board *board)
{

	/* Don't call this with board->irq == 0 */

	if (IS_SX_BOARD(board)) {
		write_sx_byte (board, SX_CONFIG, SX_IRQ_REG_VAL (board) | 
		                                 SX_CONF_BUSEN | 
		                                 SX_CONF_HOSTIRQ);
	} else if (IS_EISA_BOARD(board)) {
		inb(board->eisa_base+0xc03);  
	} else if (IS_SI1_BOARD(board)) {
	       write_sx_byte (board, SI1_ISA_INTCL,0);
	       write_sx_byte (board, SI1_ISA_INTCL_CLEAR,0);
	} else {
		switch (board->irq) {
		case 11:write_sx_byte (board, SI2_ISA_IRQ11, SI2_ISA_IRQ11_SET);break;
		case 12:write_sx_byte (board, SI2_ISA_IRQ12, SI2_ISA_IRQ12_SET);break;
		case 15:write_sx_byte (board, SI2_ISA_IRQ15, SI2_ISA_IRQ15_SET);break;
		default:printk (KERN_INFO "sx: SI/XIO card doesn't support interrupt %d.\n", 
		                board->irq);
		return 0;
		}
		write_sx_byte (board, SI2_ISA_INTCLEAR, SI2_ISA_INTCLEAR_SET);
	}

	return 1;
}


static int sx_send_command (struct sx_port *port, 
                     	    int command, int mask, int newstat)
{
	func_enter2 ();
	write_sx_byte (port->board, CHAN_OFFSET (port, hi_hstat), command);
	func_exit ();
	return sx_busy_wait_eq (port->board, CHAN_OFFSET (port, hi_hstat), mask, newstat);
}


static char *mod_type_s (int module_type)
{
	switch (module_type) {
	case TA4:       return "TA4";
	case TA8:       return "TA8";
	case TA4_ASIC:  return "TA4_ASIC";
	case TA8_ASIC:  return "TA8_ASIC";
	case MTA_CD1400:return "MTA_CD1400";
	case SXDC:      return "SXDC";
	default:return "Unknown/invalid";
	}
}


static char *pan_type_s (int pan_type)
{
	switch (pan_type) {
	case MOD_RS232DB25:     return "MOD_RS232DB25";
	case MOD_RS232RJ45:     return "MOD_RS232RJ45";
	case MOD_RS422DB25:     return "MOD_RS422DB25";
	case MOD_PARALLEL:      return "MOD_PARALLEL";
	case MOD_2_RS232DB25:   return "MOD_2_RS232DB25";
	case MOD_2_RS232RJ45:   return "MOD_2_RS232RJ45";
	case MOD_2_RS422DB25:   return "MOD_2_RS422DB25";
	case MOD_RS232DB25MALE: return "MOD_RS232DB25MALE";
	case MOD_2_PARALLEL:    return "MOD_2_PARALLEL";
	case MOD_BLANK:         return "empty";
	default:return "invalid";
	}
}


static int mod_compat_type (int module_type)
{
	return module_type >> 4;
}

static void sx_reconfigure_port(struct sx_port *port)
{
	if (sx_read_channel_byte (port, hi_hstat) == HS_IDLE_OPEN) {
		if (sx_send_command (port, HS_CONFIG, -1, HS_IDLE_OPEN) != 1) {
			printk (KERN_WARNING "sx: Sent reconfigure command, but card didn't react.\n");
		}
	} else {
		sx_dprintk (SX_DEBUG_TERMIOS, 
		            "sx: Not sending reconfigure: port isn't open (%02x).\n", 
		            sx_read_channel_byte (port, hi_hstat));
	}	
}

static void sx_setsignals (struct sx_port *port, int dtr, int rts)
{
	int t;
	func_enter2 ();

	t = sx_read_channel_byte (port, hi_op);
	if (dtr >= 0) t = dtr? (t | OP_DTR): (t & ~OP_DTR);
	if (rts >= 0) t = rts? (t | OP_RTS): (t & ~OP_RTS);
	sx_write_channel_byte (port, hi_op, t);
	sx_dprintk (SX_DEBUG_MODEMSIGNALS, "setsignals: %d/%d\n", dtr, rts);

	func_exit ();
}



static int sx_getsignals (struct sx_port *port)
{
	int i_stat,o_stat;

	o_stat = sx_read_channel_byte (port, hi_op);
	i_stat = sx_read_channel_byte (port, hi_ip);

	sx_dprintk (SX_DEBUG_MODEMSIGNALS, "getsignals: %d/%d  (%d/%d) %02x/%02x\n",
	            (o_stat & OP_DTR) != 0, (o_stat & OP_RTS) != 0,
	            port->c_dcd, sx_get_CD (port),
	            sx_read_channel_byte (port, hi_ip),
	            sx_read_channel_byte (port, hi_state));

	return (((o_stat & OP_DTR)?TIOCM_DTR:0) |
	        ((o_stat & OP_RTS)?TIOCM_RTS:0) |
	        ((i_stat & IP_CTS)?TIOCM_CTS:0) |
	        ((i_stat & IP_DCD)?TIOCM_CAR:0) |
	        ((i_stat & IP_DSR)?TIOCM_DSR:0) |
	        ((i_stat & IP_RI)?TIOCM_RNG:0)
	        );
}


static void sx_set_baud (struct sx_port *port)
{
	int t;

	if (port->board->ta_type == MOD_SXDC) {
		switch (port->gs.baud) {
		  /* Save some typing work... */
#define e(x) case x:t= BAUD_ ## x ; break
			e(50);e(75);e(110);e(150);e(200);e(300);e(600);
                        e(1200);e(1800);e(2000);e(2400);e(4800);e(7200);
                        e(9600);e(14400);e(19200);e(28800);e(38400);
                        e(56000);e(57600);e(64000);e(76800);e(115200);
			e(128000);e(150000);e(230400);e(256000);e(460800);
                        e(921600);
		case 134    :t = BAUD_134_5;   break;
		case 0      :t = -1;
								 break;
		default:
			/* Can I return "invalid"? */
			t = BAUD_9600;
			printk (KERN_INFO "sx: unsupported baud rate: %d.\n", port->gs.baud);
			break;
		}
#undef e
		if (t > 0) {
			/* The baud rate is not set to 0, so we're enabeling DTR... -- REW */
			sx_setsignals (port, 1, -1); 
			/* XXX This is not TA & MTA compatible */
			sx_write_channel_byte (port, hi_csr, 0xff);

			sx_write_channel_byte (port, hi_txbaud, t);
			sx_write_channel_byte (port, hi_rxbaud, t);
		} else {
			sx_setsignals (port, 0, -1);
		}
	} else {
		switch (port->gs.baud) {
#define e(x) case x:t= CSR_ ## x ; break
			e(75);e(150);e(300);e(600);e(1200);e(2400);e(4800);
                        e(1800);e(9600);
			e(19200);e(57600);e(38400);
			/* TA supports 110, but not 115200, MTA supports 115200, but not 110 */
		case 110: 
			if (port->board->ta_type == MOD_TA) {
				t = CSR_110;
				break;
			} else {
				t = CSR_9600;
				printk (KERN_INFO "sx: Unsupported baud rate: %d.\n", port->gs.baud);
				break;
			}
		case 115200: 
			if (port->board->ta_type == MOD_TA) {
				t = CSR_9600;
				printk (KERN_INFO "sx: Unsupported baud rate: %d.\n", port->gs.baud);
				break;
			} else {
				t = CSR_110;
				break;
			}
		case 0      :t = -1;
								 break;
		default:
			t = CSR_9600;
			printk (KERN_INFO "sx: Unsupported baud rate: %d.\n", port->gs.baud);
			break;
		}
#undef e
		if (t >= 0) {
			sx_setsignals (port, 1, -1);
			sx_write_channel_byte (port, hi_csr, t * 0x11);
		} else {
			sx_setsignals (port, 0, -1);
		}
	}
}


/* Simon Allen's version of this routine was 225 lines long. 85 is a lot
   better. -- REW */

static int sx_set_real_termios (void *ptr)
{
	struct sx_port *port = ptr;

	func_enter2();

	if (!port->gs.tty)
		return 0;

	/* What is this doing here? -- REW
	   Ha! figured it out. It is to allow you to get DTR active again
	   if you've dropped it with stty 0. Moved to set_baud, where it
	   belongs (next to the drop dtr if baud == 0) -- REW */
	/* sx_setsignals (port, 1, -1); */

	sx_set_baud (port);

#define CFLAG port->gs.tty->termios->c_cflag
	sx_write_channel_byte (port, hi_mr1,
	                       (C_PARENB (port->gs.tty)? MR1_WITH:MR1_NONE) |
	                       (C_PARODD (port->gs.tty)? MR1_ODD:MR1_EVEN) |
	                       (C_CRTSCTS(port->gs.tty)? MR1_RTS_RXFLOW:0) |
	                       (((CFLAG & CSIZE)==CS8) ? MR1_8_BITS:0) |
	                       (((CFLAG & CSIZE)==CS7) ? MR1_7_BITS:0) |
	                       (((CFLAG & CSIZE)==CS6) ? MR1_6_BITS:0) |
	                       (((CFLAG & CSIZE)==CS5) ? MR1_5_BITS:0) );

	sx_write_channel_byte (port, hi_mr2,
	                       (C_CRTSCTS(port->gs.tty)?MR2_CTS_TXFLOW:0) |
	                       (C_CSTOPB (port->gs.tty)?MR2_2_STOP:MR2_1_STOP));

	switch (CFLAG & CSIZE) {
	case CS8:sx_write_channel_byte (port, hi_mask, 0xff);break;
	case CS7:sx_write_channel_byte (port, hi_mask, 0x7f);break;
	case CS6:sx_write_channel_byte (port, hi_mask, 0x3f);break;
	case CS5:sx_write_channel_byte (port, hi_mask, 0x1f);break;
	default:
		printk (KERN_INFO "sx: Invalid wordsize: %u\n", CFLAG & CSIZE);
		break;
	}

	sx_write_channel_byte (port, hi_prtcl, 
	                       (I_IXON   (port->gs.tty)?SP_TXEN:0) |
	                       (I_IXOFF  (port->gs.tty)?SP_RXEN:0) |
	                       (I_IXANY  (port->gs.tty)?SP_TANY:0) |
	                       SP_DCEN);

	sx_write_channel_byte (port, hi_break, 
	                       (I_IGNBRK(port->gs.tty)?BR_IGN:0 |
	                        I_BRKINT(port->gs.tty)?BR_INT:0));

	sx_write_channel_byte (port, hi_txon,  START_CHAR (port->gs.tty));
	sx_write_channel_byte (port, hi_rxon,  START_CHAR (port->gs.tty));
	sx_write_channel_byte (port, hi_txoff, STOP_CHAR  (port->gs.tty));
	sx_write_channel_byte (port, hi_rxoff, STOP_CHAR  (port->gs.tty));

	sx_reconfigure_port(port);

	/* Tell line discipline whether we will do input cooking */
	if(I_OTHER(port->gs.tty)) {
		clear_bit(TTY_HW_COOK_IN, &port->gs.tty->flags);
	} else {
		set_bit(TTY_HW_COOK_IN, &port->gs.tty->flags);
	}
	sx_dprintk (SX_DEBUG_TERMIOS, "iflags: %x(%d) ",
	            port->gs.tty->termios->c_iflag, 
	            I_OTHER(port->gs.tty));


/* Tell line discipline whether we will do output cooking.
 * If OPOST is set and no other output flags are set then we can do output
 * processing.  Even if only *one* other flag in the O_OTHER group is set
 * we do cooking in software.
 */
	if(O_OPOST(port->gs.tty) && !O_OTHER(port->gs.tty)) {
		set_bit(TTY_HW_COOK_OUT, &port->gs.tty->flags);
	} else {
		clear_bit(TTY_HW_COOK_OUT, &port->gs.tty->flags);
	}
	sx_dprintk (SX_DEBUG_TERMIOS, "oflags: %x(%d)\n",
	            port->gs.tty->termios->c_oflag, 
	            O_OTHER(port->gs.tty));
	/* port->c_dcd = sx_get_CD (port); */
	func_exit ();
	return 0;
}



/* ********************************************************************** *
 *                   the interrupt related routines                       *
 * ********************************************************************** */

/* Note:
   Other drivers use the macro "MIN" to calculate how much to copy.
   This has the disadvantage that it will evaluate parts twice. That's
   expensive when it's IO (and the compiler cannot optimize those away!).
   Moreover, I'm not sure that you're race-free. 

   I assign a value, and then only allow the value to decrease. This
   is always safe. This makes the code a few lines longer, and you
   know I'm dead against that, but I think it is required in this
   case.  */


static void sx_transmit_chars (struct sx_port *port)
{
	int c;
	int tx_ip;
	int txroom;

	func_enter2 ();
	sx_dprintk (SX_DEBUG_TRANSMIT, "Port %p: transmit %d chars\n", 
	            port, port->gs.xmit_cnt);

	if (test_and_set_bit (SX_PORT_TRANSMIT_LOCK, &port->locks)) {
		return;
	}

	while (1) {
		c = port->gs.xmit_cnt;

		sx_dprintk (SX_DEBUG_TRANSMIT, "Copying %d ", c);
		tx_ip  = sx_read_channel_byte (port, hi_txipos);

		/* Took me 5 minutes to deduce this formula. 
		   Luckily it is literally in the manual in section 6.5.4.3.5 */
		txroom = (sx_read_channel_byte (port, hi_txopos) - tx_ip - 1) & 0xff;

		/* Don't copy more bytes than there is room for in the buffer */
		if (c > txroom)
			c = txroom;
		sx_dprintk (SX_DEBUG_TRANSMIT, " %d(%d) ", c, txroom );

		/* Don't copy past the end of the hardware transmit buffer */
		if (c > 0x100 - tx_ip) 
			c = 0x100 - tx_ip;

		sx_dprintk (SX_DEBUG_TRANSMIT, " %d(%d) ", c, 0x100-tx_ip );

		/* Don't copy pas the end of the source buffer */
		if (c > SERIAL_XMIT_SIZE - port->gs.xmit_tail) 
			c = SERIAL_XMIT_SIZE - port->gs.xmit_tail;

		sx_dprintk (SX_DEBUG_TRANSMIT, " %d(%ld) \n", 
		            c, SERIAL_XMIT_SIZE- port->gs.xmit_tail);

		/* If for one reason or another, we can't copy more data, we're done! */
		if (c == 0) break;


		memcpy_toio (port->board->base + CHAN_OFFSET(port,hi_txbuf) + tx_ip, 
		             port->gs.xmit_buf + port->gs.xmit_tail, c);

		/* Update the pointer in the card */
		sx_write_channel_byte (port, hi_txipos, (tx_ip+c) & 0xff);

		/* Update the kernel buffer end */
		port->gs.xmit_tail = (port->gs.xmit_tail + c) & (SERIAL_XMIT_SIZE-1);

		/* This one last. (this is essential)
		   It would allow others to start putting more data into the buffer! */
		port->gs.xmit_cnt -= c;
	}

	if (port->gs.xmit_cnt == 0) {
		sx_disable_tx_interrupts (port);
	}

	if ((port->gs.xmit_cnt <= port->gs.wakeup_chars) && port->gs.tty) {
		tty_wakeup(port->gs.tty);
		sx_dprintk (SX_DEBUG_TRANSMIT, "Waking up.... ldisc (%d)....\n",
		            port->gs.wakeup_chars); 
	}

	clear_bit (SX_PORT_TRANSMIT_LOCK, &port->locks);
	func_exit ();
}


/* Note the symmetry between receiving chars and transmitting them!
   Note: The kernel should have implemented both a receive buffer and
   a transmit buffer. */

/* Inlined: Called only once. Remove the inline when you add another call */
static inline void sx_receive_chars (struct sx_port *port)
{
	int c;
	int rx_op;
	struct tty_struct *tty;
	int copied=0;
	unsigned char *rp;

	func_enter2 ();
	tty = port->gs.tty;
	while (1) {
		rx_op = sx_read_channel_byte (port, hi_rxopos);
		c = (sx_read_channel_byte (port, hi_rxipos) - rx_op) & 0xff;

		sx_dprintk (SX_DEBUG_RECEIVE, "rxop=%d, c = %d.\n", rx_op, c); 

		/* Don't copy past the end of the hardware receive buffer */
		if (rx_op + c > 0x100) c = 0x100 - rx_op;

		sx_dprintk (SX_DEBUG_RECEIVE, "c = %d.\n", c);

		/* Don't copy more bytes than there is room for in the buffer */

		c = tty_prepare_flip_string(tty, &rp, c);

		sx_dprintk (SX_DEBUG_RECEIVE, "c = %d.\n", c); 

		/* If for one reason or another, we can't copy more data, we're done! */
		if (c == 0) break;

		sx_dprintk (SX_DEBUG_RECEIVE , "Copying over %d chars. First is %d at %lx\n", c, 
		            read_sx_byte (port->board, CHAN_OFFSET(port,hi_rxbuf) + rx_op),
		            CHAN_OFFSET(port, hi_rxbuf)); 
		memcpy_fromio (rp,
		               port->board->base + CHAN_OFFSET(port,hi_rxbuf) + rx_op, c);

		/* This one last. ( Not essential.)
		   It allows the card to start putting more data into the buffer! 
		   Update the pointer in the card */
		sx_write_channel_byte (port, hi_rxopos, (rx_op + c) & 0xff);

		copied += c;
	}
	if (copied) {
		struct timeval tv;

		do_gettimeofday (&tv);
		sx_dprintk (SX_DEBUG_RECEIVE, 
		            "pushing flipq port %d (%3d chars): %d.%06d  (%d/%d)\n", 
		            port->line, copied, 
		            (int) (tv.tv_sec % 60), (int)tv.tv_usec, tty->raw, tty->real_raw);

		/* Tell the rest of the system the news. Great news. New characters! */
		tty_flip_buffer_push (tty);
		/*    tty_schedule_flip (tty); */
	}

	func_exit ();
}

/* Inlined: it is called only once. Remove the inline if you add another 
   call */
static inline void sx_check_modem_signals (struct sx_port *port)
{
	int hi_state;
	int c_dcd;

	hi_state = sx_read_channel_byte (port, hi_state);
	sx_dprintk (SX_DEBUG_MODEMSIGNALS, "Checking modem signals (%d/%d)\n",
	            port->c_dcd, sx_get_CD (port));

	if (hi_state & ST_BREAK) {
		hi_state &= ~ST_BREAK;
		sx_dprintk (SX_DEBUG_MODEMSIGNALS, "got a break.\n");
		sx_write_channel_byte (port, hi_state, hi_state);
		gs_got_break (&port->gs);
	}
	if (hi_state & ST_DCD) {
		hi_state &= ~ST_DCD;
		sx_dprintk (SX_DEBUG_MODEMSIGNALS, "got a DCD change.\n");
		sx_write_channel_byte (port, hi_state, hi_state);
		c_dcd = sx_get_CD (port);
		sx_dprintk (SX_DEBUG_MODEMSIGNALS, "DCD is now %d\n", c_dcd);
		if (c_dcd != port->c_dcd) {
			port->c_dcd = c_dcd;
			if (sx_get_CD (port)) {
				/* DCD went UP */
				if ((sx_read_channel_byte(port, hi_hstat) != HS_IDLE_CLOSED) &&
						!(port->gs.tty->termios->c_cflag & CLOCAL) ) {
					/* Are we blocking in open?*/
					sx_dprintk (SX_DEBUG_MODEMSIGNALS, "DCD active, unblocking open\n");
					wake_up_interruptible(&port->gs.open_wait);
				} else {
					sx_dprintk (SX_DEBUG_MODEMSIGNALS, "DCD raised. Ignoring.\n");
				}
			} else {
				/* DCD went down! */
				if (!(port->gs.tty->termios->c_cflag & CLOCAL) ) {
					sx_dprintk (SX_DEBUG_MODEMSIGNALS, "DCD dropped. hanging up....\n");
					tty_hangup (port->gs.tty);
				} else {
					sx_dprintk (SX_DEBUG_MODEMSIGNALS, "DCD dropped. ignoring.\n");
				}
			}
		} else {
			sx_dprintk (SX_DEBUG_MODEMSIGNALS, "Hmmm. card told us DCD changed, but it didn't.\n");
		}
	}
}


/* This is what an interrupt routine should look like. 
 * Small, elegant, clear.
 */

static irqreturn_t sx_interrupt (int irq, void *ptr, struct pt_regs *regs)
{
	struct sx_board *board = ptr;
	struct sx_port *port;
	int i;

	func_enter ();
	sx_dprintk (SX_DEBUG_FLOW, "sx: enter sx_interrupt (%d/%d)\n", irq, board->irq); 

	/* AAargh! The order in which to do these things is essential and
	   not trivial. 

	   - Rate limit goes before "recursive". Otherwise a series of
	     recursive calls will hang the machine in the interrupt routine. 

	   - hardware twiddling goes before "recursive". Otherwise when we
	     poll the card, and a recursive interrupt happens, we won't
	     ack the card, so it might keep on interrupting us. (especially
	     level sensitive interrupt systems like PCI).

	   - Rate limit goes before hardware twiddling. Otherwise we won't
	     catch a card that has gone bonkers.

	   - The "initialized" test goes after the hardware twiddling. Otherwise
	     the card will stick us in the interrupt routine again.

	   - The initialized test goes before recursive. 
	*/



#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) */
	{
		static int lastjif;
		static int nintr=0;

		if (lastjif == jiffies) {
			if (++nintr > IRQ_RATE_LIMIT) {
				free_irq (board->irq, board);
				printk (KERN_ERR "sx: Too many interrupts. Turning off interrupt %d.\n", 
					      board->irq);
			}
		} else {
			lastjif = jiffies;
			nintr = 0;
		}
	}
#endif


	if (board->irq == irq) {
		/* Tell the card we've noticed the interrupt. */

		sx_write_board_word (board, cc_int_pending, 0);
		if (IS_SX_BOARD (board)) {
			write_sx_byte (board, SX_RESET_IRQ, 1);
		} else if (IS_EISA_BOARD(board)) {
			inb(board->eisa_base+0xc03);
			write_sx_word(board, 8, 0); 
		} else {
			write_sx_byte (board, SI2_ISA_INTCLEAR, SI2_ISA_INTCLEAR_CLEAR);
			write_sx_byte (board, SI2_ISA_INTCLEAR, SI2_ISA_INTCLEAR_SET);
		}
	}

	if (!sx_initialized)
		return IRQ_HANDLED;
	if (!(board->flags & SX_BOARD_INITIALIZED))
		return IRQ_HANDLED;

	if (test_and_set_bit (SX_BOARD_INTR_LOCK, &board->locks)) {
		printk (KERN_ERR "Recursive interrupt! (%d)\n", board->irq);
		return IRQ_HANDLED;
	}

	 for (i=0;i<board->nports;i++) {
		port = &board->ports[i];
		if (port->gs.flags & GS_ACTIVE) {
			if (sx_read_channel_byte (port, hi_state)) {
				sx_dprintk (SX_DEBUG_INTERRUPTS, 
				            "Port %d: modem signal change?... \n", i);
				sx_check_modem_signals (port); 
			}
			if (port->gs.xmit_cnt) {
				sx_transmit_chars (port);
			}
			if (!(port->gs.flags & SX_RX_THROTTLE)) {
				sx_receive_chars (port);
			}
		}
	}

	clear_bit (SX_BOARD_INTR_LOCK, &board->locks);

	sx_dprintk (SX_DEBUG_FLOW, "sx: exit sx_interrupt (%d/%d)\n", irq, board->irq); 
        func_exit ();
	return IRQ_HANDLED;
}


static void sx_pollfunc (unsigned long data)
{
	struct sx_board *board = (struct sx_board *) data;

	func_enter ();

	sx_interrupt (0, board, NULL);

	init_timer(&board->timer);

	board->timer.expires = jiffies + sx_poll;
	add_timer (&board->timer);
	func_exit ();
}



/* ********************************************************************** *
 *                Here are the routines that actually                     *
 *              interface with the generic_serial driver                  *
 * ********************************************************************** */

/* Ehhm. I don't know how to fiddle with interrupts on the SX card. --REW */
/* Hmm. Ok I figured it out. You don't.  */

static void sx_disable_tx_interrupts (void * ptr) 
{
	struct sx_port *port = ptr; 
	func_enter2();

	port->gs.flags &= ~GS_TX_INTEN;

	func_exit();
}


static void sx_enable_tx_interrupts (void * ptr) 
{
	struct sx_port *port = ptr; 
	int data_in_buffer;
	func_enter2();

	/* First transmit the characters that we're supposed to */
	sx_transmit_chars (port);

	/* The sx card will never interrupt us if we don't fill the buffer
	   past 25%. So we keep considering interrupts off if that's the case. */
	data_in_buffer = (sx_read_channel_byte (port, hi_txipos) - 
	                  sx_read_channel_byte (port, hi_txopos)) & 0xff;

	/* XXX Must be "HIGH_WATER" for SI card according to doc. */
	if (data_in_buffer < LOW_WATER) 
		port->gs.flags &= ~GS_TX_INTEN;

	func_exit();
}


static void sx_disable_rx_interrupts (void * ptr) 
{
	/*  struct sx_port *port = ptr; */
	func_enter();

	func_exit();
}

static void sx_enable_rx_interrupts (void * ptr) 
{
	/*  struct sx_port *port = ptr; */
	func_enter();

	func_exit();
}


/* Jeez. Isn't this simple? */
static int sx_get_CD (void * ptr) 
{
	struct sx_port *port = ptr;
	func_enter2();

	func_exit();
	return ((sx_read_channel_byte (port, hi_ip) & IP_DCD) != 0);
}


/* Jeez. Isn't this simple? */
static int sx_chars_in_buffer (void * ptr) 
{
	struct sx_port *port = ptr;
	func_enter2();

	func_exit();
	return ((sx_read_channel_byte (port, hi_txipos) - 
	         sx_read_channel_byte (port, hi_txopos)) & 0xff);
}


static void sx_shutdown_port (void * ptr) 
{
	struct sx_port *port = ptr; 

	func_enter();

	port->gs.flags &= ~ GS_ACTIVE;
	if (port->gs.tty && (port->gs.tty->termios->c_cflag & HUPCL)) {
		sx_setsignals (port, 0, 0);
		sx_reconfigure_port(port);
	}

	func_exit();
}





/* ********************************************************************** *
 *                Here are the routines that actually                     *
 *               interface with the rest of the system                    *
 * ********************************************************************** */

static int sx_open  (struct tty_struct * tty, struct file * filp)
{
	struct sx_port *port;
	int retval, line;
	unsigned long flags;

	func_enter();

	if (!sx_initialized) {
		return -EIO;
	}

	line = tty->index;
	sx_dprintk (SX_DEBUG_OPEN, "%d: opening line %d. tty=%p ctty=%p, np=%d)\n", 
	            current->pid, line, tty, current->signal->tty, sx_nports);

	if ((line < 0) || (line >= SX_NPORTS) || (line >= sx_nports))
		return -ENODEV;

	port = & sx_ports[line];
	port->c_dcd = 0; /* Make sure that the first interrupt doesn't detect a
	                    1 -> 0 transition. */


	sx_dprintk (SX_DEBUG_OPEN, "port = %p c_dcd = %d\n", port, port->c_dcd);

	spin_lock_irqsave(&port->gs.driver_lock, flags);

	tty->driver_data = port;
	port->gs.tty = tty;
	port->gs.count++;
	spin_unlock_irqrestore(&port->gs.driver_lock, flags);

	sx_dprintk (SX_DEBUG_OPEN, "starting port\n");

	/*
	 * Start up serial port
	 */
	retval = gs_init_port(&port->gs);
	sx_dprintk (SX_DEBUG_OPEN, "done gs_init\n");
	if (retval) {
		port->gs.count--;
		return retval;
	}

	port->gs.flags |= GS_ACTIVE;
	if (port->gs.count <= 1)
		sx_setsignals (port, 1,1);

#if 0
	if (sx_debug & SX_DEBUG_OPEN)
		my_hd (port, sizeof (*port));
#else
	if (sx_debug & SX_DEBUG_OPEN)
		my_hd_io (port->board->base + port->ch_base, sizeof (*port));
#endif

	if (port->gs.count <= 1) {
		if (sx_send_command (port, HS_LOPEN, -1, HS_IDLE_OPEN) != 1) {
			printk (KERN_ERR "sx: Card didn't respond to LOPEN command.\n");
			spin_lock_irqsave(&port->gs.driver_lock, flags);
			port->gs.count--;
			spin_unlock_irqrestore(&port->gs.driver_lock, flags);
			return -EIO;
		}
	}

	retval = gs_block_til_ready(port, filp);
	sx_dprintk (SX_DEBUG_OPEN, "Block til ready returned %d. Count=%d\n", 
	            retval, port->gs.count);

	if (retval) {
		/* 
		 * Don't lower gs.count here because sx_close() will be called later
		 */ 

		return retval;
	}
	/* tty->low_latency = 1; */

	port->c_dcd = sx_get_CD (port);
	sx_dprintk (SX_DEBUG_OPEN, "at open: cd=%d\n", port->c_dcd);

	func_exit();
	return 0;

}


static void sx_close (void *ptr)
{
	struct sx_port *port = ptr; 
	/* Give the port 5 seconds to close down. */
	int to = 5 * HZ; 

	func_enter ();

	sx_setsignals (port, 0, 0);
	sx_reconfigure_port(port);	
	sx_send_command (port, HS_CLOSE, 0, 0);

	while (to-- && (sx_read_channel_byte (port, hi_hstat) != HS_IDLE_CLOSED))
		if (msleep_interruptible(10))
			break;
	if (sx_read_channel_byte (port, hi_hstat) != HS_IDLE_CLOSED) {
		if (sx_send_command (port, HS_FORCE_CLOSED, -1, HS_IDLE_CLOSED) != 1) {
			printk (KERN_ERR 
			        "sx: sent the force_close command, but card didn't react\n");
		} else
			sx_dprintk (SX_DEBUG_CLOSE, "sent the force_close command.\n");
	}

	sx_dprintk (SX_DEBUG_CLOSE, "waited %d jiffies for close. count=%d\n", 
	            5 * HZ - to - 1, port->gs.count);

	if(port->gs.count) {
		sx_dprintk(SX_DEBUG_CLOSE, "WARNING port count:%d\n", port->gs.count);
		//printk ("%s SETTING port count to zero: %p count: %d\n", __FUNCTION__, port, port->gs.count);
		//port->gs.count = 0;
	}

	func_exit ();
}



/* This is relatively thorough. But then again it is only 20 lines. */
#define MARCHUP    for (i=min;i<max;i++) 
#define MARCHDOWN  for (i=max-1;i>=min;i--)
#define W0         write_sx_byte (board, i, 0x55)
#define W1         write_sx_byte (board, i, 0xaa)
#define R0         if (read_sx_byte (board, i) != 0x55) return 1
#define R1         if (read_sx_byte (board, i) != 0xaa) return 1

/* This memtest takes a human-noticable time. You normally only do it
   once a boot, so I guess that it is worth it. */
static int do_memtest (struct sx_board *board, int min, int max)
{
	int i;

	/* This is a marchb. Theoretically, marchb catches much more than
	   simpler tests. In practise, the longer test just catches more
	   intermittent errors. -- REW
	   (For the theory behind memory testing see: 
	   Testing Semiconductor Memories by A.J. van de Goor.) */
	MARCHUP	 {W0;}
	MARCHUP   {R0;W1;R1;W0;R0;W1;}
	MARCHUP   {R1;W0;W1;}
	MARCHDOWN {R1;W0;W1;W0;}
	MARCHDOWN {R0;W1;W0;}

	return 0;
}


#undef MARCHUP
#undef MARCHDOWN
#undef W0
#undef W1
#undef R0
#undef R1

#define MARCHUP    for (i=min;i<max;i+=2) 
#define MARCHDOWN  for (i=max-1;i>=min;i-=2)
#define W0         write_sx_word (board, i, 0x55aa)
#define W1         write_sx_word (board, i, 0xaa55)
#define R0         if (read_sx_word (board, i) != 0x55aa) return 1
#define R1         if (read_sx_word (board, i) != 0xaa55) return 1

#if 0
/* This memtest takes a human-noticable time. You normally only do it
   once a boot, so I guess that it is worth it. */
static int do_memtest_w (struct sx_board *board, int min, int max)
{
	int i;

	MARCHUP   {W0;}
	MARCHUP   {R0;W1;R1;W0;R0;W1;}
	MARCHUP   {R1;W0;W1;}
	MARCHDOWN {R1;W0;W1;W0;}
	MARCHDOWN {R0;W1;W0;}

	return 0;
}
#endif


static int sx_fw_ioctl (struct inode *inode, struct file *filp,
                        unsigned int cmd, unsigned long arg)
{
	int rc = 0;
	int __user *descr = (int __user *)arg;
	int i;
	static struct sx_board *board = NULL;
	int nbytes, offset;
	unsigned long data;
	char *tmp;

	func_enter();

#if 0 
	/* Removed superuser check: Sysops can use the permissions on the device
	   file to restrict access. Recommendation: Root only. (root.root 600) */
	if (!capable(CAP_SYS_ADMIN)) {
		return -EPERM;
	}
#endif

	sx_dprintk (SX_DEBUG_FIRMWARE, "IOCTL %x: %lx\n", cmd, arg);

	if (!board) board = &boards[0];
	if (board->flags & SX_BOARD_PRESENT) {
		sx_dprintk (SX_DEBUG_FIRMWARE, "Board present! (%x)\n", 
		            board->flags);
	} else {
		sx_dprintk (SX_DEBUG_FIRMWARE, "Board not present! (%x) all:", 
		            board->flags);
		for (i=0;i< SX_NBOARDS;i++)
			sx_dprintk (SX_DEBUG_FIRMWARE, "<%x> ", boards[i].flags);
		sx_dprintk (SX_DEBUG_FIRMWARE, "\n");
		return -EIO;
	}

	switch (cmd) {
	case SXIO_SET_BOARD:
		sx_dprintk (SX_DEBUG_FIRMWARE, "set board to %ld\n", arg);
		if (arg >= SX_NBOARDS) return -EIO;
		sx_dprintk (SX_DEBUG_FIRMWARE, "not out of range\n");
		if (!(boards[arg].flags	& SX_BOARD_PRESENT)) return -EIO;
		sx_dprintk (SX_DEBUG_FIRMWARE, ".. and present!\n");
		board = &boards[arg];
		break;
	case SXIO_GET_TYPE:
		rc = -ENOENT; /* If we manage to miss one, return error. */
		if (IS_SX_BOARD (board)) rc = SX_TYPE_SX;
		if (IS_CF_BOARD (board)) rc = SX_TYPE_CF;
		if (IS_SI_BOARD (board)) rc = SX_TYPE_SI;
		if (IS_SI1_BOARD (board)) rc = SX_TYPE_SI;
		if (IS_EISA_BOARD (board)) rc = SX_TYPE_SI;
		sx_dprintk (SX_DEBUG_FIRMWARE, "returning type= %d\n", rc);
		break;
	case SXIO_DO_RAMTEST:
		if (sx_initialized) /* Already initialized: better not ramtest the board.  */
			return -EPERM;
		if (IS_SX_BOARD (board)) {
			rc          = do_memtest   (board, 0, 0x7000);
			if (!rc) rc = do_memtest   (board, 0, 0x7000);
			/*if (!rc) rc = do_memtest_w (board, 0, 0x7000);*/
		} else {
			rc             = do_memtest   (board, 0, 0x7ff8);
			/* if (!rc) rc = do_memtest_w (board, 0, 0x7ff8); */
		}
		sx_dprintk (SX_DEBUG_FIRMWARE, "returning memtest result= %d\n", rc);
		break;
	case SXIO_DOWNLOAD:
		if (sx_initialized) /* Already initialized */
			return -EEXIST;
		if (!sx_reset (board)) 
			return -EIO;
		sx_dprintk (SX_DEBUG_INIT, "reset the board...\n");

		tmp = kmalloc (SX_CHUNK_SIZE, GFP_USER);
		if (!tmp) return -ENOMEM;
		get_user (nbytes, descr++);
		get_user (offset, descr++); 
		get_user (data,	 descr++);
		while (nbytes && data) {
			for (i=0;i<nbytes;i += SX_CHUNK_SIZE) {
				if (copy_from_user(tmp, (char __user *)data+i, 
						   (i + SX_CHUNK_SIZE >
						    nbytes) ? nbytes - i :
						   	      SX_CHUNK_SIZE)) {
					kfree (tmp);
					return -EFAULT;
				}
				memcpy_toio(board->base2 + offset + i, tmp, 
				                (i+SX_CHUNK_SIZE>nbytes)?nbytes-i:SX_CHUNK_SIZE);
			}

			get_user (nbytes, descr++);
			get_user (offset, descr++); 
			get_user (data,   descr++);
		}
		kfree (tmp);
		sx_nports += sx_init_board (board);
		rc = sx_nports;
		break;
	case SXIO_INIT:
		if (sx_initialized) /* Already initialized */
			return -EEXIST;
		/* This is not allowed until all boards are initialized... */
		for (i=0;i<SX_NBOARDS;i++) {
			if ( (boards[i].flags & SX_BOARD_PRESENT) &&
			     !(boards[i].flags & SX_BOARD_INITIALIZED))
				return -EIO;
		}
		for (i=0;i<SX_NBOARDS;i++)
			if (!(boards[i].flags & SX_BOARD_PRESENT)) break;

		sx_dprintk (SX_DEBUG_FIRMWARE, "initing portstructs, %d boards, "
		            "%d channels, first board: %d ports\n", 
		            i, sx_nports, boards[0].nports);
		rc = sx_init_portstructs (i, sx_nports);
		sx_init_drivers ();
		if (rc >= 0) 
			sx_initialized++;
		break;
	case SXIO_SETDEBUG:
		sx_debug = arg;
		break;
	case SXIO_GETDEBUG:
		rc = sx_debug;
		break;
	case SXIO_GETGSDEBUG:
	case SXIO_SETGSDEBUG:
		rc = -EINVAL;
		break;
	case SXIO_GETNPORTS:
		rc = sx_nports;
		break;
	default:
		printk (KERN_WARNING "Unknown ioctl on firmware device (%x).\n", cmd);
		break;
	}
	func_exit ();
	return rc;
}


static void sx_break (struct tty_struct * tty, int flag)
{
	struct sx_port *port = tty->driver_data;
	int rv;

	func_enter ();

	if (flag) 
		rv = sx_send_command (port, HS_START, -1, HS_IDLE_BREAK);
	else 
		rv = sx_send_command (port, HS_STOP, -1, HS_IDLE_OPEN);
	if (rv != 1) printk (KERN_ERR "sx: couldn't send break (%x).\n",
			read_sx_byte (port->board, CHAN_OFFSET (port, hi_hstat)));

	func_exit ();
}


static int sx_tiocmget(struct tty_struct *tty, struct file *file)
{
	struct sx_port *port = tty->driver_data;
	return sx_getsignals(port);
}

static int sx_tiocmset(struct tty_struct *tty, struct file *file,
		       unsigned int set, unsigned int clear)
{
	struct sx_port *port = tty->driver_data;
	int rts = -1, dtr = -1;

	if (set & TIOCM_RTS)
		rts = 1;
	if (set & TIOCM_DTR)
		dtr = 1;
	if (clear & TIOCM_RTS)
		rts = 0;
	if (clear & TIOCM_DTR)
		dtr = 0;

	sx_setsignals(port, dtr, rts);
	sx_reconfigure_port(port);
	return 0;
}

static int sx_ioctl (struct tty_struct * tty, struct file * filp, 
                     unsigned int cmd, unsigned long arg)
{
	int rc;
	struct sx_port *port = tty->driver_data;
	void __user *argp = (void __user *)arg;
	int ival;

	/* func_enter2(); */

	rc = 0;
	switch (cmd) {
	case TIOCGSOFTCAR:
		rc = put_user(((tty->termios->c_cflag & CLOCAL) ? 1 : 0),
		              (unsigned __user *) argp);
		break;
	case TIOCSSOFTCAR:
		if ((rc = get_user(ival, (unsigned __user *) argp)) == 0) {
			tty->termios->c_cflag =
				(tty->termios->c_cflag & ~CLOCAL) |
				(ival ? CLOCAL : 0);
		}
		break;
	case TIOCGSERIAL:
		rc = gs_getserial(&port->gs, argp);
		break;
	case TIOCSSERIAL:
		rc = gs_setserial(&port->gs, argp);
		break;
	default:
		rc = -ENOIOCTLCMD;
		break;
	}

	/* func_exit(); */
	return rc;
}


/* The throttle/unthrottle scheme for the Specialix card is different
 * from other drivers and deserves some explanation. 
 * The Specialix hardware takes care of XON/XOFF
 * and CTS/RTS flow control itself.  This means that all we have to
 * do when signalled by the upper tty layer to throttle/unthrottle is
 * to make a note of it here.  When we come to read characters from the
 * rx buffers on the card (sx_receive_chars()) we look to see if the
 * upper layer can accept more (as noted here in sx_rx_throt[]). 
 * If it can't we simply don't remove chars from the cards buffer. 
 * When the tty layer can accept chars, we again note that here and when
 * sx_receive_chars() is called it will remove them from the cards buffer.
 * The card will notice that a ports buffer has drained below some low
 * water mark and will unflow control the line itself, using whatever
 * flow control scheme is in use for that port. -- Simon Allen
 */

static void sx_throttle (struct tty_struct * tty)
{
	struct sx_port *port = (struct sx_port *)tty->driver_data;

	func_enter2();
	/* If the port is using any type of input flow
	 * control then throttle the port.
	 */
	if((tty->termios->c_cflag & CRTSCTS) || (I_IXOFF(tty)) ) {
		port->gs.flags |= SX_RX_THROTTLE;
	}
	func_exit();
}


static void sx_unthrottle (struct tty_struct * tty)
{
	struct sx_port *port = (struct sx_port *)tty->driver_data;

	func_enter2();
	/* Always unthrottle even if flow control is not enabled on
	 * this port in case we disabled flow control while the port
	 * was throttled
	 */
	port->gs.flags &= ~SX_RX_THROTTLE;
	func_exit();
	return;
}


/* ********************************************************************** *
 *                    Here are the initialization routines.               *
 * ********************************************************************** */




static int sx_init_board (struct sx_board *board)
{
	int addr;
	int chans;
	int type;

	func_enter();

	/* This is preceded by downloading the download code. */

	board->flags |= SX_BOARD_INITIALIZED;

	if (read_sx_byte (board, 0))
		/* CF boards may need this. */
		write_sx_byte(board,0, 0);

	/* This resets the processor again, to make sure it didn't do any
	   foolish things while we were downloading the image */
	if (!sx_reset (board))
		return 0;

	sx_start_board (board);
	udelay (10);
	if (!sx_busy_wait_neq (board, 0, 0xff, 0)) {
		printk (KERN_ERR "sx: Ooops. Board won't initialize.\n");
		return 0;
	}

	/* Ok. So now the processor on the card is running. It gathered
	   some info for us... */
	sx_dprintk (SX_DEBUG_INIT, "The sxcard structure:\n");
	if (sx_debug & SX_DEBUG_INIT) my_hd_io (board->base, 0x10);
	sx_dprintk (SX_DEBUG_INIT, "the first sx_module structure:\n");
	if (sx_debug & SX_DEBUG_INIT) my_hd_io (board->base + 0x80, 0x30);

	sx_dprintk (SX_DEBUG_INIT, 
	            "init_status: %x, %dk memory, firmware V%x.%02x,\n", 
	            read_sx_byte (board, 0), read_sx_byte(board, 1), 
	            read_sx_byte (board, 5), read_sx_byte(board, 4));

	if (read_sx_byte (board, 0) == 0xff) {
		printk (KERN_INFO "sx: No modules found. Sorry.\n");
		board->nports = 0;
		return 0;
	}

	chans = 0;

	if (IS_SX_BOARD(board)) {
		sx_write_board_word (board, cc_int_count, sx_maxints);
	} else {
		if (sx_maxints)
			sx_write_board_word (board, cc_int_count, SI_PROCESSOR_CLOCK/8/sx_maxints);
	}

	/* grab the first module type... */
	/*  board->ta_type = mod_compat_type (read_sx_byte (board, 0x80 + 0x08)); */
	board->ta_type = mod_compat_type (sx_read_module_byte (board, 0x80, mc_chip));

	/* XXX byteorder */
	for (addr = 0x80;addr != 0;addr = read_sx_word (board, addr) & 0x7fff) {
		type = sx_read_module_byte (board, addr, mc_chip);
		sx_dprintk (SX_DEBUG_INIT, "Module at %x: %d channels\n", 
		            addr, read_sx_byte (board, addr + 2));

		chans += sx_read_module_byte (board, addr, mc_type);

		sx_dprintk (SX_DEBUG_INIT, "module is an %s, which has %s/%s panels\n", 
		            mod_type_s (type),
		            pan_type_s (sx_read_module_byte (board, addr, mc_mods) & 0xf),
		            pan_type_s (sx_read_module_byte (board, addr, mc_mods) >> 4));

		sx_dprintk (SX_DEBUG_INIT, "CD1400 versions: %x/%x, ASIC version: %x\n", 
		            sx_read_module_byte (board, addr, mc_rev1),
		            sx_read_module_byte (board, addr, mc_rev2),
		            sx_read_module_byte (board, addr, mc_mtaasic_rev));

		/* The following combinations are illegal: It should theoretically
		   work, but timing problems make the bus HANG. */

		if (mod_compat_type (type) != board->ta_type) {
			printk (KERN_ERR "sx: This is an invalid configuration.\n"
			        "Don't mix TA/MTA/SXDC on the same hostadapter.\n");
			chans=0;
			break;
		}
		if ((IS_EISA_BOARD(board) || 
		     IS_SI_BOARD(board)) && (mod_compat_type(type) == 4)) {
			printk (KERN_ERR "sx: This is an invalid configuration.\n"
			        "Don't use SXDCs on an SI/XIO adapter.\n");
			chans=0;
			break;
		}
#if 0 /* Problem fixed: firmware 3.05 */
		if (IS_SX_BOARD(board) && (type == TA8)) {
			/* There are some issues with the firmware and the DCD/RTS
			   lines. It might work if you tie them together or something.
			   It might also work if you get a newer sx_firmware.	Therefore
			   this is just a warning. */
			printk (KERN_WARNING "sx: The SX host doesn't work too well "
			        "with the TA8 adapters.\nSpecialix is working on it.\n");
		}
#endif
	}

	if (chans) {
		/* board->flags |= SX_BOARD_PRESENT; */
		if(board->irq > 0) {
			/* fixed irq, probably PCI */
			if(sx_irqmask & (1 << board->irq)) { /* may we use this irq? */
				if(request_irq(board->irq, sx_interrupt, SA_SHIRQ | SA_INTERRUPT, "sx", board)) {
					printk(KERN_ERR "sx: Cannot allocate irq %d.\n", board->irq);
					board->irq = 0;
				}
			} else
				board->irq = 0;
		} else if(board->irq < 0 && sx_irqmask) {
			/* auto-allocate irq */
			int irqnr;
			int irqmask = sx_irqmask & (IS_SX_BOARD(board) ? SX_ISA_IRQ_MASK : SI2_ISA_IRQ_MASK);
			for(irqnr = 15; irqnr > 0; irqnr--)
				if(irqmask & (1 << irqnr))
					if(! request_irq(irqnr, sx_interrupt, SA_SHIRQ | SA_INTERRUPT, "sx", board))
						break;
			if(! irqnr)
				printk(KERN_ERR "sx: Cannot allocate IRQ.\n");
			board->irq = irqnr;
		} else
			board->irq = 0;

		if (board->irq) {
			/* Found a valid interrupt, start up interrupts! */
			sx_dprintk (SX_DEBUG_INIT, "Using irq %d.\n", board->irq);
			sx_start_interrupts (board);
			board->poll = sx_slowpoll;
			board->flags |= SX_IRQ_ALLOCATED;
		} else {
			/* no irq: setup board for polled operation */
			board->poll = sx_poll;
			sx_dprintk (SX_DEBUG_INIT, "Using poll-interval %d.\n", board->poll);
		}

		/* The timer should be initialized anyway: That way we can safely
			 del_timer it when the module is unloaded. */
		init_timer (&board->timer);

		if (board->poll) {
			board->timer.data = (unsigned long) board;
			board->timer.function = sx_pollfunc;
			board->timer.expires = jiffies + board->poll;
			add_timer (&board->timer);
		}
	} else {
		board->irq = 0;
	}

	board->nports = chans;
	sx_dprintk (SX_DEBUG_INIT, "returning %d ports.", board->nports);

	func_exit();
	return chans;
}


static void printheader(void)
{
	static int header_printed;

	if (!header_printed) {
		printk (KERN_INFO "Specialix SX driver "
		        "(C) 1998/1999 R.E.Wolff@BitWizard.nl \n");
		printk (KERN_INFO "sx: version %s\n", RCS_ID);
		header_printed = 1;
	}
}


static int probe_sx (struct sx_board *board)
{
	struct vpd_prom vpdp;
	char *p;
	int i;

	func_enter();

	if (!IS_CF_BOARD (board)) {    
		sx_dprintk (SX_DEBUG_PROBE, "Going to verify vpd prom at %p.\n", 
		            board->base + SX_VPD_ROM);

		if (sx_debug & SX_DEBUG_PROBE)
			my_hd_io(board->base + SX_VPD_ROM, 0x40);

		p = (char *) &vpdp;
		for (i=0;i< sizeof (struct vpd_prom);i++)
			*p++ = read_sx_byte (board, SX_VPD_ROM + i*2);

		if (sx_debug & SX_DEBUG_PROBE)
			my_hd (&vpdp, 0x20);

		sx_dprintk (SX_DEBUG_PROBE, "checking identifier...\n");

		if (strncmp (vpdp.identifier, SX_VPD_IDENT_STRING, 16) != 0) {
			sx_dprintk (SX_DEBUG_PROBE, "Got non-SX identifier: '%s'\n", 
			            vpdp.identifier); 
			return 0;
		}
	}

	printheader ();

	if (!IS_CF_BOARD (board)) {
		printk (KERN_DEBUG "sx: Found an SX board at %lx\n", board->hw_base);
		printk (KERN_DEBUG "sx: hw_rev: %d, assembly level: %d, uniq ID:%08x, ", 
		        vpdp.hwrev, vpdp.hwass, vpdp.uniqid);
		printk (           "Manufactured: %d/%d\n", 
		        1970 + vpdp.myear, vpdp.mweek);


		if ((((vpdp.uniqid >> 24) & SX_UNIQUEID_MASK) != SX_PCI_UNIQUEID1) &&
		    (((vpdp.uniqid >> 24) & SX_UNIQUEID_MASK) != SX_ISA_UNIQUEID1)) {
			/* This might be a bit harsh. This was the primary reason the
			   SX/ISA card didn't work at first... */
			printk (KERN_ERR "sx: Hmm. Not an SX/PCI or SX/ISA card. Sorry: giving up.\n");
			return (0);
		}

		if (((vpdp.uniqid >> 24) & SX_UNIQUEID_MASK) == SX_ISA_UNIQUEID1) {
			if (((unsigned long)board->hw_base) & 0x8000) {
				printk (KERN_WARNING "sx: Warning: There may be hardware problems with the card at %lx.\n", board->hw_base);
				printk (KERN_WARNING "sx: Read sx.txt for more info.\n");
			}
		}
	}

	board->nports = -1;

	/* This resets the processor, and keeps it off the bus. */
	if (!sx_reset (board)) 
		return 0;
	sx_dprintk (SX_DEBUG_INIT, "reset the board...\n");

	board->flags |= SX_BOARD_PRESENT;

	func_exit();
	return 1;
}



/* Specialix probes for this card at 32k increments from 640k to 16M.
   I consider machines with less than 16M unlikely nowadays, so I'm
   not probing above 1Mb. Also, 0xa0000, 0xb0000, are taken by the VGA
   card. 0xe0000 and 0xf0000 are taken by the BIOS. That only leaves 
   0xc0000, 0xc8000, 0xd0000 and 0xd8000 . */

static int probe_si (struct sx_board *board)
{
	int i;

	func_enter();
	sx_dprintk (SX_DEBUG_PROBE, "Going to verify SI signature hw %lx at %p.\n", board->hw_base,
	            board->base + SI2_ISA_ID_BASE);

	if (sx_debug & SX_DEBUG_PROBE)
		my_hd_io(board->base + SI2_ISA_ID_BASE, 0x8);

	if (!IS_EISA_BOARD(board)) {
	  if( IS_SI1_BOARD(board) ) 
	    {
		for (i=0;i<8;i++) {
		  write_sx_byte (board, SI2_ISA_ID_BASE+7-i,i); 

		}
	    }
		for (i=0;i<8;i++) {
			if ((read_sx_byte (board, SI2_ISA_ID_BASE+7-i) & 7) != i) {
				func_exit ();
				return 0;
			}
		}
	}

	/* Now we're pretty much convinced that there is an SI board here, 
	   but to prevent trouble, we'd better double check that we don't
	   have an SI1 board when we're probing for an SI2 board.... */

	write_sx_byte (board, SI2_ISA_ID_BASE,0x10); 
	if ( IS_SI1_BOARD(board)) {
		/* This should be an SI1 board, which has this
		   location writable... */
		if (read_sx_byte (board, SI2_ISA_ID_BASE) != 0x10) {
			func_exit ();
			return 0; 
		}
	} else {
		/* This should be an SI2 board, which has the bottom
		   3 bits non-writable... */
		if (read_sx_byte (board, SI2_ISA_ID_BASE) == 0x10) {
			func_exit ();
			return 0; 
		}
	}

	/* Now we're pretty much convinced that there is an SI board here, 
	   but to prevent trouble, we'd better double check that we don't
	   have an SI1 board when we're probing for an SI2 board.... */

	write_sx_byte (board, SI2_ISA_ID_BASE,0x10); 
	if ( IS_SI1_BOARD(board)) {
		/* This should be an SI1 board, which has this
		   location writable... */
		if (read_sx_byte (board, SI2_ISA_ID_BASE) != 0x10) {
			func_exit();
			return 0; 
		}
	} else {
		/* This should be an SI2 board, which has the bottom
		   3 bits non-writable... */
		if (read_sx_byte (board, SI2_ISA_ID_BASE) == 0x10) {
			func_exit ();
			return 0; 
		}
	}

	printheader ();

	printk (KERN_DEBUG "sx: Found an SI board at %lx\n", board->hw_base);
	/* Compared to the SX boards, it is a complete guess as to what
		 this card is up to... */

	board->nports = -1;

	/* This resets the processor, and keeps it off the bus. */
	if (!sx_reset (board)) 
		return 0;
	sx_dprintk (SX_DEBUG_INIT, "reset the board...\n");

	board->flags |= SX_BOARD_PRESENT;

	func_exit();
	return 1;
}

static struct tty_operations sx_ops = {
	.break_ctl = sx_break,
	.open	= sx_open,
	.close = gs_close,
	.write = gs_write,
	.put_char = gs_put_char,
	.flush_chars = gs_flush_chars,
	.write_room = gs_write_room,
	.chars_in_buffer = gs_chars_in_buffer,
	.flush_buffer = gs_flush_buffer,
	.ioctl = sx_ioctl,
	.throttle = sx_throttle,
	.unthrottle = sx_unthrottle,
	.set_termios = gs_set_termios,
	.stop = gs_stop,
	.start = gs_start,
	.hangup = gs_hangup,
	.tiocmget = sx_tiocmget,
	.tiocmset = sx_tiocmset,
};

static int sx_init_drivers(void)
{
	int error;

	func_enter();

	sx_driver = alloc_tty_driver(sx_nports);
	if (!sx_driver)
		return 1;
	sx_driver->owner = THIS_MODULE;
	sx_driver->driver_name = "specialix_sx";
	sx_driver->name = "ttyX";
	sx_driver->major = SX_NORMAL_MAJOR;
	sx_driver->type = TTY_DRIVER_TYPE_SERIAL;
	sx_driver->subtype = SERIAL_TYPE_NORMAL;
	sx_driver->init_termios = tty_std_termios;
	sx_driver->init_termios.c_cflag =
	  B9600 | CS8 | CREAD | HUPCL | CLOCAL;
	sx_driver->flags = TTY_DRIVER_REAL_RAW;
	tty_set_operations(sx_driver, &sx_ops);

	if ((error = tty_register_driver(sx_driver))) {
		put_tty_driver(sx_driver);
		printk(KERN_ERR "sx: Couldn't register sx driver, error = %d\n",
		       error);
		return 1;
	}
	func_exit();
	return 0;
}


static void * ckmalloc (int size)
{
	void *p;

	p = kmalloc(size, GFP_KERNEL);
	if (p) 
		memset(p, 0, size);
	return p;
}


static int sx_init_portstructs (int nboards, int nports)
{
	struct sx_board *board;
	struct sx_port *port;
	int i, j;
	int addr, chans;
	int portno;

	func_enter();

	/* Many drivers statically allocate the maximum number of ports
	   There is no reason not to allocate them dynamically. Is there? -- REW */
	sx_ports          = ckmalloc(nports * sizeof (struct sx_port));
	if (!sx_ports)
		return -ENOMEM;

	port = sx_ports;
	for (i = 0; i < nboards; i++) {
		board = &boards[i];
		board->ports = port;
		for (j=0; j < boards[i].nports;j++) {
			sx_dprintk (SX_DEBUG_INIT, "initing port %d\n", j);
			port->gs.magic = SX_MAGIC;
			port->gs.close_delay = HZ/2;
			port->gs.closing_wait = 30 * HZ;
			port->board = board;
			port->gs.rd = &sx_real_driver;
#ifdef NEW_WRITE_LOCKING
			port->gs.port_write_sem = MUTEX;
#endif
			port->gs.driver_lock = SPIN_LOCK_UNLOCKED;
			/*
			 * Initializing wait queue
			 */
			init_waitqueue_head(&port->gs.open_wait);
			init_waitqueue_head(&port->gs.close_wait); 		
			
			port++;
		}
	}

	port = sx_ports;
	portno = 0;
	for (i = 0; i < nboards; i++) {
		board = &boards[i];
		board->port_base = portno;
		/* Possibly the configuration was rejected. */
		sx_dprintk (SX_DEBUG_PROBE, "Board has %d channels\n", board->nports);
		if (board->nports <= 0) continue;
		/* XXX byteorder ?? */
		for (addr = 0x80;addr != 0;addr = read_sx_word (board, addr) & 0x7fff) {
			chans = sx_read_module_byte (board, addr, mc_type); 
			sx_dprintk (SX_DEBUG_PROBE, "Module at %x: %d channels\n", addr, chans);
			sx_dprintk (SX_DEBUG_PROBE, "Port at");
			for (j=0;j<chans;j++) {
				/* The "sx-way" is the way it SHOULD be done. That way in the 
				   future, the firmware may for example pack the structures a bit
				   more efficient. Neil tells me it isn't going to happen anytime
				   soon though. */
				if (IS_SX_BOARD(board))
					port->ch_base = sx_read_module_word (board, addr+j*2, mc_chan_pointer);
				else
					port->ch_base = addr + 0x100 + 0x300*j;

				sx_dprintk (SX_DEBUG_PROBE, " %x", port->ch_base);
				port->line = portno++;
				port++;
			}
			sx_dprintk (SX_DEBUG_PROBE, "\n");
		}
		/* This has to be done earlier. */
		/* board->flags |= SX_BOARD_INITIALIZED; */
	}

	func_exit();
	return 0;
}

static void __exit sx_release_drivers(void)
{
	func_enter();
	tty_unregister_driver(sx_driver);
	put_tty_driver(sx_driver);
	func_exit();
}

#ifdef CONFIG_PCI
 /******************************************************** 
 * Setting bit 17 in the CNTRL register of the PLX 9050  * 
 * chip forces a retry on writes while a read is pending.*
 * This is to prevent the card locking up on Intel Xeon  *
 * multiprocessor systems with the NX chipset.    -- NV  *
 ********************************************************/

/* Newer cards are produced with this bit set from the configuration
   EEprom.  As the bit is read/write for the CPU, we can fix it here,
   if we detect that it isn't set correctly. -- REW */

static void fix_sx_pci (struct pci_dev *pdev, struct sx_board *board)
{
	unsigned int hwbase;
	void __iomem *rebase;
	unsigned int t;

#define CNTRL_REG_OFFSET        0x50
#define CNTRL_REG_GOODVALUE     0x18260000

	pci_read_config_dword(pdev, PCI_BASE_ADDRESS_0, &hwbase);
	hwbase &= PCI_BASE_ADDRESS_MEM_MASK;
	rebase = ioremap(hwbase, 0x80);
	t = readl (rebase + CNTRL_REG_OFFSET);
	if (t != CNTRL_REG_GOODVALUE) {
		printk (KERN_DEBUG "sx: performing cntrl reg fix: %08x -> %08x\n", t, CNTRL_REG_GOODVALUE); 
		writel (CNTRL_REG_GOODVALUE, rebase + CNTRL_REG_OFFSET);
	}
	iounmap(rebase);
}
#endif


static int __init sx_init(void) 
{
	int i;
	int found = 0;
	int eisa_slot;
	struct sx_board *board;

#ifdef CONFIG_PCI
	struct pci_dev *pdev = NULL;
	unsigned int tint;
	unsigned short tshort;
#endif

	func_enter();
	sx_dprintk (SX_DEBUG_INIT, "Initing sx module... (sx_debug=%d)\n", sx_debug);
	if (abs ((long) (&sx_debug) - sx_debug) < 0x10000) {
		printk (KERN_WARNING "sx: sx_debug is an address, instead of a value. "
		        "Assuming -1.\n");
		printk ("(%p)\n", &sx_debug);
		sx_debug=-1;
	}

	if (misc_register(&sx_fw_device) < 0) {
		printk(KERN_ERR "SX: Unable to register firmware loader driver.\n");
		return -EIO;
	}

#ifdef CONFIG_PCI
	while ((pdev = pci_find_device (PCI_VENDOR_ID_SPECIALIX, 
					PCI_DEVICE_ID_SPECIALIX_SX_XIO_IO8, 
					      pdev))) {
		if (pci_enable_device(pdev))
			continue;

		/* Specialix has a whole bunch of cards with
		   0x2000 as the device ID. They say its because
		   the standard requires it. Stupid standard. */
		/* It seems that reading a word doesn't work reliably on 2.0.
		   Also, reading a non-aligned dword doesn't work. So we read the
		   whole dword at 0x2c and extract the word at 0x2e (SUBSYSTEM_ID)
		   ourselves */
		/* I don't know why the define doesn't work, constant 0x2c does --REW */ 
		pci_read_config_dword (pdev, 0x2c, &tint);
		tshort = (tint >> 16) & 0xffff;
		sx_dprintk (SX_DEBUG_PROBE, "Got a specialix card: %x.\n", tint);
		/* sx_dprintk (SX_DEBUG_PROBE, "pdev = %d/%d	(%x)\n", pdev, tint); */ 
		if ((tshort != 0x0200) && (tshort != 0x0300)) {
			sx_dprintk (SX_DEBUG_PROBE, "But it's not an SX card (%d)...\n", 
				    tshort);
			continue;
		}
		board = &boards[found];

		board->flags &= ~SX_BOARD_TYPE;
		board->flags |= (tshort == 0x200)?SX_PCI_BOARD:
						  SX_CFPCI_BOARD;

		/* CF boards use base address 3.... */
		if (IS_CF_BOARD (board))
			board->hw_base = pci_resource_start (pdev, 3);
		else
			board->hw_base = pci_resource_start (pdev, 2);
		board->base2 = 
		board->base = ioremap(board->hw_base, WINDOW_LEN (board));
		if (!board->base) {
			printk(KERN_ERR "ioremap failed\n");
			/* XXX handle error */
		}

		/* Most of the stuff on the CF board is offset by
		   0x18000 ....  */
		if (IS_CF_BOARD (board)) board->base += 0x18000;

		board->irq = pdev->irq;

		sx_dprintk (SX_DEBUG_PROBE, "Got a specialix card: %x/%p(%d) %x.\n", 
			    tint, boards[found].base, board->irq, board->flags);

		if (probe_sx (board)) {
			found++;
			fix_sx_pci (pdev, board);
		} else 
			iounmap(board->base2);
	}
#endif

	for (i=0;i<NR_SX_ADDRS;i++) {
		board = &boards[found];
		board->hw_base = sx_probe_addrs[i];
		board->base2 =
		board->base = ioremap(board->hw_base, SX_WINDOW_LEN);
		board->flags &= ~SX_BOARD_TYPE;
		board->flags |=	SX_ISA_BOARD;
		board->irq = sx_irqmask?-1:0;

		if (probe_sx (board)) {
			found++;
		} else {
			iounmap(board->base);
		}
	}

	for (i=0;i<NR_SI_ADDRS;i++) {
		board = &boards[found];
		board->hw_base = si_probe_addrs[i];
		board->base2 =
		board->base = ioremap(board->hw_base, SI2_ISA_WINDOW_LEN);
		board->flags &= ~SX_BOARD_TYPE;
		board->flags |=  SI_ISA_BOARD;
		board->irq = sx_irqmask ?-1:0;

		if (probe_si (board)) {
			found++;
		} else {
			iounmap (board->base);
		}
	}
	for (i=0;i<NR_SI1_ADDRS;i++) {
		board = &boards[found];
		board->hw_base = si1_probe_addrs[i];
		board->base2 =
		board->base = ioremap(board->hw_base, SI1_ISA_WINDOW_LEN);
		board->flags &= ~SX_BOARD_TYPE;
		board->flags |=  SI1_ISA_BOARD;
		board->irq = sx_irqmask ?-1:0;

		if (probe_si (board)) {
			found++;
		} else {
			iounmap (board->base);
		}
	}

        sx_dprintk(SX_DEBUG_PROBE, "Probing for EISA cards\n");
        for(eisa_slot=0x1000; eisa_slot<0x10000; eisa_slot+=0x1000)
        {
                if((inb(eisa_slot+0xc80)==0x4d) &&
                   (inb(eisa_slot+0xc81)==0x98))
                {
			sx_dprintk(SX_DEBUG_PROBE, "%s : Signature found in EISA slot %d, Product %d Rev %d\n",
			                        "XIO", (eisa_slot>>12), inb(eisa_slot+0xc82), inb(eisa_slot+0xc83));

			board = &boards[found];
			board->eisa_base = eisa_slot;
			board->flags &= ~SX_BOARD_TYPE;
			board->flags |= SI_EISA_BOARD;

			board->hw_base = (((inb(0xc01+eisa_slot) << 8) + inb(0xc00+eisa_slot)) << 16);
			board->base2 =
			board->base = ioremap(board->hw_base, SI2_EISA_WINDOW_LEN);

			sx_dprintk(SX_DEBUG_PROBE, "IO hw_base address: %lx\n", board->hw_base);
			sx_dprintk(SX_DEBUG_PROBE, "base: %p\n", board->base);
			board->irq = inb(board->eisa_base+0xc02)>>4; 
			sx_dprintk(SX_DEBUG_PROBE, "IRQ: %d\n", board->irq);
			
			probe_si(board);

			found++;
		}
	}
	if (found) {
		printk (KERN_INFO "sx: total of %d boards detected.\n", found);
	} else {
		misc_deregister(&sx_fw_device);
	}

	func_exit();
	return found?0:-EIO;
}


static void __exit sx_exit (void)
{
	int i; 
	struct sx_board *board;

	func_enter();
	for (i = 0; i < SX_NBOARDS; i++) {
		board = &boards[i];
		if (board->flags & SX_BOARD_INITIALIZED) {
			sx_dprintk (SX_DEBUG_CLEANUP, "Cleaning up board at %p\n", board->base);
			/* The board should stop messing with us.
			   (actually I mean the interrupt) */
			sx_reset (board);
			if ((board->irq) && (board->flags & SX_IRQ_ALLOCATED))
				free_irq (board->irq, board);

			/* It is safe/allowed to del_timer a non-active timer */
			del_timer (& board->timer);
			iounmap(board->base);
		}
	}
	if (misc_deregister(&sx_fw_device) < 0) {
		printk (KERN_INFO "sx: couldn't deregister firmware loader devic\n");
	}
	sx_dprintk (SX_DEBUG_CLEANUP, "Cleaning up drivers (%d)\n", sx_initialized);
	if (sx_initialized)
		sx_release_drivers ();

	kfree (sx_ports);
	func_exit();
}

module_init(sx_init);
module_exit(sx_exit);