aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/char/stallion.c
blob: a1a68f90d8030d2490f019ba1e5c99655a27f062 (plain) (blame)
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
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
/*****************************************************************************/

/*
 *	stallion.c  -- stallion multiport serial driver.
 *
 *	Copyright (C) 1996-1999  Stallion Technologies
 *	Copyright (C) 1994-1996  Greg Ungerer.
 *
 *	This code is loosely based on the Linux serial driver, written by
 *	Linus Torvalds, Theodore T'so and others.
 *
 *	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.
 */

/*****************************************************************************/

#include <linux/config.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/cd1400.h>
#include <linux/sc26198.h>
#include <linux/comstats.h>
#include <linux/stallion.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/smp_lock.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/device.h>
#include <linux/delay.h>

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

#ifdef CONFIG_PCI
#include <linux/pci.h>
#endif

/*****************************************************************************/

/*
 *	Define different board types. Use the standard Stallion "assigned"
 *	board numbers. Boards supported in this driver are abbreviated as
 *	EIO = EasyIO and ECH = EasyConnection 8/32.
 */
#define	BRD_EASYIO	20
#define	BRD_ECH		21
#define	BRD_ECHMC	22
#define	BRD_ECHPCI	26
#define	BRD_ECH64PCI	27
#define	BRD_EASYIOPCI	28

/*
 *	Define a configuration structure to hold the board configuration.
 *	Need to set this up in the code (for now) with the boards that are
 *	to be configured into the system. This is what needs to be modified
 *	when adding/removing/modifying boards. Each line entry in the
 *	stl_brdconf[] array is a board. Each line contains io/irq/memory
 *	ranges for that board (as well as what type of board it is).
 *	Some examples:
 *		{ BRD_EASYIO, 0x2a0, 0, 0, 10, 0 },
 *	This line would configure an EasyIO board (4 or 8, no difference),
 *	at io address 2a0 and irq 10.
 *	Another example:
 *		{ BRD_ECH, 0x2a8, 0x280, 0, 12, 0 },
 *	This line will configure an EasyConnection 8/32 board at primary io
 *	address 2a8, secondary io address 280 and irq 12.
 *	Enter as many lines into this array as you want (only the first 4
 *	will actually be used!). Any combination of EasyIO and EasyConnection
 *	boards can be specified. EasyConnection 8/32 boards can share their
 *	secondary io addresses between each other.
 *
 *	NOTE: there is no need to put any entries in this table for PCI
 *	boards. They will be found automatically by the driver - provided
 *	PCI BIOS32 support is compiled into the kernel.
 */

typedef struct {
	int		brdtype;
	int		ioaddr1;
	int		ioaddr2;
	unsigned long	memaddr;
	int		irq;
	int		irqtype;
} stlconf_t;

static stlconf_t	stl_brdconf[] = {
	/*{ BRD_EASYIO, 0x2a0, 0, 0, 10, 0 },*/
};

static int	stl_nrbrds = ARRAY_SIZE(stl_brdconf);

/*****************************************************************************/

/*
 *	Define some important driver characteristics. Device major numbers
 *	allocated as per Linux Device Registry.
 */
#ifndef	STL_SIOMEMMAJOR
#define	STL_SIOMEMMAJOR		28
#endif
#ifndef	STL_SERIALMAJOR
#define	STL_SERIALMAJOR		24
#endif
#ifndef	STL_CALLOUTMAJOR
#define	STL_CALLOUTMAJOR	25
#endif

/*
 *	Set the TX buffer size. Bigger is better, but we don't want
 *	to chew too much memory with buffers!
 */
#define	STL_TXBUFLOW		512
#define	STL_TXBUFSIZE		4096

/*****************************************************************************/

/*
 *	Define our local driver identity first. Set up stuff to deal with
 *	all the local structures required by a serial tty driver.
 */
static char	*stl_drvtitle = "Stallion Multiport Serial Driver";
static char	*stl_drvname = "stallion";
static char	*stl_drvversion = "5.6.0";

static struct tty_driver	*stl_serial;

/*
 *	We will need to allocate a temporary write buffer for chars that
 *	come direct from user space. The problem is that a copy from user
 *	space might cause a page fault (typically on a system that is
 *	swapping!). All ports will share one buffer - since if the system
 *	is already swapping a shared buffer won't make things any worse.
 */
static char			*stl_tmpwritebuf;

/*
 *	Define a local default termios struct. All ports will be created
 *	with this termios initially. Basically all it defines is a raw port
 *	at 9600, 8 data bits, 1 stop bit.
 */
static struct termios		stl_deftermios = {
	.c_cflag	= (B9600 | CS8 | CREAD | HUPCL | CLOCAL),
	.c_cc		= INIT_C_CC,
};

/*
 *	Define global stats structures. Not used often, and can be
 *	re-used for each stats call.
 */
static comstats_t	stl_comstats;
static combrd_t		stl_brdstats;
static stlbrd_t		stl_dummybrd;
static stlport_t	stl_dummyport;

/*
 *	Define global place to put buffer overflow characters.
 */
static char		stl_unwanted[SC26198_RXFIFOSIZE];

/*****************************************************************************/

static stlbrd_t		*stl_brds[STL_MAXBRDS];

/*
 *	Per board state flags. Used with the state field of the board struct.
 *	Not really much here!
 */
#define	BRD_FOUND	0x1

/*
 *	Define the port structure istate flags. These set of flags are
 *	modified at interrupt time - so setting and reseting them needs
 *	to be atomic. Use the bit clear/setting routines for this.
 */
#define	ASYI_TXBUSY	1
#define	ASYI_TXLOW	2
#define	ASYI_DCDCHANGE	3
#define	ASYI_TXFLOWED	4

/*
 *	Define an array of board names as printable strings. Handy for
 *	referencing boards when printing trace and stuff.
 */
static char	*stl_brdnames[] = {
	(char *) NULL,
	(char *) NULL,
	(char *) NULL,
	(char *) NULL,
	(char *) NULL,
	(char *) NULL,
	(char *) NULL,
	(char *) NULL,
	(char *) NULL,
	(char *) NULL,
	(char *) NULL,
	(char *) NULL,
	(char *) NULL,
	(char *) NULL,
	(char *) NULL,
	(char *) NULL,
	(char *) NULL,
	(char *) NULL,
	(char *) NULL,
	(char *) NULL,
	"EasyIO",
	"EC8/32-AT",
	"EC8/32-MC",
	(char *) NULL,
	(char *) NULL,
	(char *) NULL,
	"EC8/32-PCI",
	"EC8/64-PCI",
	"EasyIO-PCI",
};

/*****************************************************************************/

/*
 *	Define some string labels for arguments passed from the module
 *	load line. These allow for easy board definitions, and easy
 *	modification of the io, memory and irq resoucres.
 */
static int	stl_nargs = 0;
static char	*board0[4];
static char	*board1[4];
static char	*board2[4];
static char	*board3[4];

static char	**stl_brdsp[] = {
	(char **) &board0,
	(char **) &board1,
	(char **) &board2,
	(char **) &board3
};

/*
 *	Define a set of common board names, and types. This is used to
 *	parse any module arguments.
 */

typedef struct stlbrdtype {
	char	*name;
	int	type;
} stlbrdtype_t;

static stlbrdtype_t	stl_brdstr[] = {
	{ "easyio", BRD_EASYIO },
	{ "eio", BRD_EASYIO },
	{ "20", BRD_EASYIO },
	{ "ec8/32", BRD_ECH },
	{ "ec8/32-at", BRD_ECH },
	{ "ec8/32-isa", BRD_ECH },
	{ "ech", BRD_ECH },
	{ "echat", BRD_ECH },
	{ "21", BRD_ECH },
	{ "ec8/32-mc", BRD_ECHMC },
	{ "ec8/32-mca", BRD_ECHMC },
	{ "echmc", BRD_ECHMC },
	{ "echmca", BRD_ECHMC },
	{ "22", BRD_ECHMC },
	{ "ec8/32-pc", BRD_ECHPCI },
	{ "ec8/32-pci", BRD_ECHPCI },
	{ "26", BRD_ECHPCI },
	{ "ec8/64-pc", BRD_ECH64PCI },
	{ "ec8/64-pci", BRD_ECH64PCI },
	{ "ech-pci", BRD_ECH64PCI },
	{ "echpci", BRD_ECH64PCI },
	{ "echpc", BRD_ECH64PCI },
	{ "27", BRD_ECH64PCI },
	{ "easyio-pc", BRD_EASYIOPCI },
	{ "easyio-pci", BRD_EASYIOPCI },
	{ "eio-pci", BRD_EASYIOPCI },
	{ "eiopci", BRD_EASYIOPCI },
	{ "28", BRD_EASYIOPCI },
};

/*
 *	Define the module agruments.
 */
MODULE_AUTHOR("Greg Ungerer");
MODULE_DESCRIPTION("Stallion Multiport Serial Driver");
MODULE_LICENSE("GPL");

module_param_array(board0, charp, &stl_nargs, 0);
MODULE_PARM_DESC(board0, "Board 0 config -> name[,ioaddr[,ioaddr2][,irq]]");
module_param_array(board1, charp, &stl_nargs, 0);
MODULE_PARM_DESC(board1, "Board 1 config -> name[,ioaddr[,ioaddr2][,irq]]");
module_param_array(board2, charp, &stl_nargs, 0);
MODULE_PARM_DESC(board2, "Board 2 config -> name[,ioaddr[,ioaddr2][,irq]]");
module_param_array(board3, charp, &stl_nargs, 0);
MODULE_PARM_DESC(board3, "Board 3 config -> name[,ioaddr[,ioaddr2][,irq]]");

/*****************************************************************************/

/*
 *	Hardware ID bits for the EasyIO and ECH boards. These defines apply
 *	to the directly accessible io ports of these boards (not the uarts -
 *	they are in cd1400.h and sc26198.h).
 */
#define	EIO_8PORTRS	0x04
#define	EIO_4PORTRS	0x05
#define	EIO_8PORTDI	0x00
#define	EIO_8PORTM	0x06
#define	EIO_MK3		0x03
#define	EIO_IDBITMASK	0x07

#define	EIO_BRDMASK	0xf0
#define	ID_BRD4		0x10
#define	ID_BRD8		0x20
#define	ID_BRD16	0x30

#define	EIO_INTRPEND	0x08
#define	EIO_INTEDGE	0x00
#define	EIO_INTLEVEL	0x08
#define	EIO_0WS		0x10

#define	ECH_ID		0xa0
#define	ECH_IDBITMASK	0xe0
#define	ECH_BRDENABLE	0x08
#define	ECH_BRDDISABLE	0x00
#define	ECH_INTENABLE	0x01
#define	ECH_INTDISABLE	0x00
#define	ECH_INTLEVEL	0x02
#define	ECH_INTEDGE	0x00
#define	ECH_INTRPEND	0x01
#define	ECH_BRDRESET	0x01

#define	ECHMC_INTENABLE	0x01
#define	ECHMC_BRDRESET	0x02

#define	ECH_PNLSTATUS	2
#define	ECH_PNL16PORT	0x20
#define	ECH_PNLIDMASK	0x07
#define	ECH_PNLXPID	0x40
#define	ECH_PNLINTRPEND	0x80

#define	ECH_ADDR2MASK	0x1e0

/*
 *	Define the vector mapping bits for the programmable interrupt board
 *	hardware. These bits encode the interrupt for the board to use - it
 *	is software selectable (except the EIO-8M).
 */
static unsigned char	stl_vecmap[] = {
	0xff, 0xff, 0xff, 0x04, 0x06, 0x05, 0xff, 0x07,
	0xff, 0xff, 0x00, 0x02, 0x01, 0xff, 0xff, 0x03
};

/*
 *	Set up enable and disable macros for the ECH boards. They require
 *	the secondary io address space to be activated and deactivated.
 *	This way all ECH boards can share their secondary io region.
 *	If this is an ECH-PCI board then also need to set the page pointer
 *	to point to the correct page.
 */
#define	BRDENABLE(brdnr,pagenr)						\
	if (stl_brds[(brdnr)]->brdtype == BRD_ECH)			\
		outb((stl_brds[(brdnr)]->ioctrlval | ECH_BRDENABLE),	\
			stl_brds[(brdnr)]->ioctrl);			\
	else if (stl_brds[(brdnr)]->brdtype == BRD_ECHPCI)		\
		outb((pagenr), stl_brds[(brdnr)]->ioctrl);

#define	BRDDISABLE(brdnr)						\
	if (stl_brds[(brdnr)]->brdtype == BRD_ECH)			\
		outb((stl_brds[(brdnr)]->ioctrlval | ECH_BRDDISABLE),	\
			stl_brds[(brdnr)]->ioctrl);

#define	STL_CD1400MAXBAUD	230400
#define	STL_SC26198MAXBAUD	460800

#define	STL_BAUDBASE		115200
#define	STL_CLOSEDELAY		(5 * HZ / 10)

/*****************************************************************************/

#ifdef CONFIG_PCI

/*
 *	Define the Stallion PCI vendor and device IDs.
 */
#ifndef	PCI_VENDOR_ID_STALLION
#define	PCI_VENDOR_ID_STALLION		0x124d
#endif
#ifndef PCI_DEVICE_ID_ECHPCI832
#define	PCI_DEVICE_ID_ECHPCI832		0x0000
#endif
#ifndef PCI_DEVICE_ID_ECHPCI864
#define	PCI_DEVICE_ID_ECHPCI864		0x0002
#endif
#ifndef PCI_DEVICE_ID_EIOPCI
#define	PCI_DEVICE_ID_EIOPCI		0x0003
#endif

/*
 *	Define structure to hold all Stallion PCI boards.
 */
typedef struct stlpcibrd {
	unsigned short		vendid;
	unsigned short		devid;
	int			brdtype;
} stlpcibrd_t;

static stlpcibrd_t	stl_pcibrds[] = {
	{ PCI_VENDOR_ID_STALLION, PCI_DEVICE_ID_ECHPCI864, BRD_ECH64PCI },
	{ PCI_VENDOR_ID_STALLION, PCI_DEVICE_ID_EIOPCI, BRD_EASYIOPCI },
	{ PCI_VENDOR_ID_STALLION, PCI_DEVICE_ID_ECHPCI832, BRD_ECHPCI },
	{ PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87410, BRD_ECHPCI },
};

static int	stl_nrpcibrds = ARRAY_SIZE(stl_pcibrds);

#endif

/*****************************************************************************/

/*
 *	Define macros to extract a brd/port number from a minor number.
 */
#define	MINOR2BRD(min)		(((min) & 0xc0) >> 6)
#define	MINOR2PORT(min)		((min) & 0x3f)

/*
 *	Define a baud rate table that converts termios baud rate selector
 *	into the actual baud rate value. All baud rate calculations are
 *	based on the actual baud rate required.
 */
static unsigned int	stl_baudrates[] = {
	0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
	9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600
};

/*
 *	Define some handy local macros...
 */
#undef	MIN
#define	MIN(a,b)	(((a) <= (b)) ? (a) : (b))

#undef	TOLOWER
#define	TOLOWER(x)	((((x) >= 'A') && ((x) <= 'Z')) ? ((x) + 0x20) : (x))

/*****************************************************************************/

/*
 *	Declare all those functions in this driver!
 */

static void	stl_argbrds(void);
static int	stl_parsebrd(stlconf_t *confp, char **argp);

static unsigned long stl_atol(char *str);

static int	stl_init(void);
static int	stl_open(struct tty_struct *tty, struct file *filp);
static void	stl_close(struct tty_struct *tty, struct file *filp);
static int	stl_write(struct tty_struct *tty, const unsigned char *buf, int count);
static void	stl_putchar(struct tty_struct *tty, unsigned char ch);
static void	stl_flushchars(struct tty_struct *tty);
static int	stl_writeroom(struct tty_struct *tty);
static int	stl_charsinbuffer(struct tty_struct *tty);
static int	stl_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
static void	stl_settermios(struct tty_struct *tty, struct termios *old);
static void	stl_throttle(struct tty_struct *tty);
static void	stl_unthrottle(struct tty_struct *tty);
static void	stl_stop(struct tty_struct *tty);
static void	stl_start(struct tty_struct *tty);
static void	stl_flushbuffer(struct tty_struct *tty);
static void	stl_breakctl(struct tty_struct *tty, int state);
static void	stl_waituntilsent(struct tty_struct *tty, int timeout);
static void	stl_sendxchar(struct tty_struct *tty, char ch);
static void	stl_hangup(struct tty_struct *tty);
static int	stl_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, unsigned long arg);
static int	stl_portinfo(stlport_t *portp, int portnr, char *pos);
static int	stl_readproc(char *page, char **start, off_t off, int count, int *eof, void *data);

static int	stl_brdinit(stlbrd_t *brdp);
static int	stl_initports(stlbrd_t *brdp, stlpanel_t *panelp);
static int	stl_getserial(stlport_t *portp, struct serial_struct __user *sp);
static int	stl_setserial(stlport_t *portp, struct serial_struct __user *sp);
static int	stl_getbrdstats(combrd_t __user *bp);
static int	stl_getportstats(stlport_t *portp, comstats_t __user *cp);
static int	stl_clrportstats(stlport_t *portp, comstats_t __user *cp);
static int	stl_getportstruct(stlport_t __user *arg);
static int	stl_getbrdstruct(stlbrd_t __user *arg);
static int	stl_waitcarrier(stlport_t *portp, struct file *filp);
static int	stl_eiointr(stlbrd_t *brdp);
static int	stl_echatintr(stlbrd_t *brdp);
static int	stl_echmcaintr(stlbrd_t *brdp);
static int	stl_echpciintr(stlbrd_t *brdp);
static int	stl_echpci64intr(stlbrd_t *brdp);
static void	stl_offintr(void *private);
static stlbrd_t *stl_allocbrd(void);
static stlport_t *stl_getport(int brdnr, int panelnr, int portnr);

static inline int	stl_initbrds(void);
static inline int	stl_initeio(stlbrd_t *brdp);
static inline int	stl_initech(stlbrd_t *brdp);
static inline int	stl_getbrdnr(void);

#ifdef	CONFIG_PCI
static inline int	stl_findpcibrds(void);
static inline int	stl_initpcibrd(int brdtype, struct pci_dev *devp);
#endif

/*
 *	CD1400 uart specific handling functions.
 */
static void	stl_cd1400setreg(stlport_t *portp, int regnr, int value);
static int	stl_cd1400getreg(stlport_t *portp, int regnr);
static int	stl_cd1400updatereg(stlport_t *portp, int regnr, int value);
static int	stl_cd1400panelinit(stlbrd_t *brdp, stlpanel_t *panelp);
static void	stl_cd1400portinit(stlbrd_t *brdp, stlpanel_t *panelp, stlport_t *portp);
static void	stl_cd1400setport(stlport_t *portp, struct termios *tiosp);
static int	stl_cd1400getsignals(stlport_t *portp);
static void	stl_cd1400setsignals(stlport_t *portp, int dtr, int rts);
static void	stl_cd1400ccrwait(stlport_t *portp);
static void	stl_cd1400enablerxtx(stlport_t *portp, int rx, int tx);
static void	stl_cd1400startrxtx(stlport_t *portp, int rx, int tx);
static void	stl_cd1400disableintrs(stlport_t *portp);
static void	stl_cd1400sendbreak(stlport_t *portp, int len);
static void	stl_cd1400flowctrl(stlport_t *portp, int state);
static void	stl_cd1400sendflow(stlport_t *portp, int state);
static void	stl_cd1400flush(stlport_t *portp);
static int	stl_cd1400datastate(stlport_t *portp);
static void	stl_cd1400eiointr(stlpanel_t *panelp, unsigned int iobase);
static void	stl_cd1400echintr(stlpanel_t *panelp, unsigned int iobase);
static void	stl_cd1400txisr(stlpanel_t *panelp, int ioaddr);
static void	stl_cd1400rxisr(stlpanel_t *panelp, int ioaddr);
static void	stl_cd1400mdmisr(stlpanel_t *panelp, int ioaddr);

static inline int	stl_cd1400breakisr(stlport_t *portp, int ioaddr);

/*
 *	SC26198 uart specific handling functions.
 */
static void	stl_sc26198setreg(stlport_t *portp, int regnr, int value);
static int	stl_sc26198getreg(stlport_t *portp, int regnr);
static int	stl_sc26198updatereg(stlport_t *portp, int regnr, int value);
static int	stl_sc26198getglobreg(stlport_t *portp, int regnr);
static int	stl_sc26198panelinit(stlbrd_t *brdp, stlpanel_t *panelp);
static void	stl_sc26198portinit(stlbrd_t *brdp, stlpanel_t *panelp, stlport_t *portp);
static void	stl_sc26198setport(stlport_t *portp, struct termios *tiosp);
static int	stl_sc26198getsignals(stlport_t *portp);
static void	stl_sc26198setsignals(stlport_t *portp, int dtr, int rts);
static void	stl_sc26198enablerxtx(stlport_t *portp, int rx, int tx);
static void	stl_sc26198startrxtx(stlport_t *portp, int rx, int tx);
static void	stl_sc26198disableintrs(stlport_t *portp);
static void	stl_sc26198sendbreak(stlport_t *portp, int len);
static void	stl_sc26198flowctrl(stlport_t *portp, int state);
static void	stl_sc26198sendflow(stlport_t *portp, int state);
static void	stl_sc26198flush(stlport_t *portp);
static int	stl_sc26198datastate(stlport_t *portp);
static void	stl_sc26198wait(stlport_t *portp);
static void	stl_sc26198txunflow(stlport_t *portp, struct tty_struct *tty);
static void	stl_sc26198intr(stlpanel_t *panelp, unsigned int iobase);
static void	stl_sc26198txisr(stlport_t *port);
static void	stl_sc26198rxisr(stlport_t *port, unsigned int iack);
static void	stl_sc26198rxbadch(stlport_t *portp, unsigned char status, char ch);
static void	stl_sc26198rxbadchars(stlport_t *portp);
static void	stl_sc26198otherisr(stlport_t *port, unsigned int iack);

/*****************************************************************************/

/*
 *	Generic UART support structure.
 */
typedef struct uart {
	int	(*panelinit)(stlbrd_t *brdp, stlpanel_t *panelp);
	void	(*portinit)(stlbrd_t *brdp, stlpanel_t *panelp, stlport_t *portp);
	void	(*setport)(stlport_t *portp, struct termios *tiosp);
	int	(*getsignals)(stlport_t *portp);
	void	(*setsignals)(stlport_t *portp, int dtr, int rts);
	void	(*enablerxtx)(stlport_t *portp, int rx, int tx);
	void	(*startrxtx)(stlport_t *portp, int rx, int tx);
	void	(*disableintrs)(stlport_t *portp);
	void	(*sendbreak)(stlport_t *portp, int len);
	void	(*flowctrl)(stlport_t *portp, int state);
	void	(*sendflow)(stlport_t *portp, int state);
	void	(*flush)(stlport_t *portp);
	int	(*datastate)(stlport_t *portp);
	void	(*intr)(stlpanel_t *panelp, unsigned int iobase);
} uart_t;

/*
 *	Define some macros to make calling these functions nice and clean.
 */
#define	stl_panelinit		(* ((uart_t *) panelp->uartp)->panelinit)
#define	stl_portinit		(* ((uart_t *) portp->uartp)->portinit)
#define	stl_setport		(* ((uart_t *) portp->uartp)->setport)
#define	stl_getsignals		(* ((uart_t *) portp->uartp)->getsignals)
#define	stl_setsignals		(* ((uart_t *) portp->uartp)->setsignals)
#define	stl_enablerxtx		(* ((uart_t *) portp->uartp)->enablerxtx)
#define	stl_startrxtx		(* ((uart_t *) portp->uartp)->startrxtx)
#define	stl_disableintrs	(* ((uart_t *) portp->uartp)->disableintrs)
#define	stl_sendbreak		(* ((uart_t *) portp->uartp)->sendbreak)
#define	stl_flowctrl		(* ((uart_t *) portp->uartp)->flowctrl)
#define	stl_sendflow		(* ((uart_t *) portp->uartp)->sendflow)
#define	stl_flush		(* ((uart_t *) portp->uartp)->flush)
#define	stl_datastate		(* ((uart_t *) portp->uartp)->datastate)

/*****************************************************************************/

/*
 *	CD1400 UART specific data initialization.
 */
static uart_t stl_cd1400uart = {
	stl_cd1400panelinit,
	stl_cd1400portinit,
	stl_cd1400setport,
	stl_cd1400getsignals,
	stl_cd1400setsignals,
	stl_cd1400enablerxtx,
	stl_cd1400startrxtx,
	stl_cd1400disableintrs,
	stl_cd1400sendbreak,
	stl_cd1400flowctrl,
	stl_cd1400sendflow,
	stl_cd1400flush,
	stl_cd1400datastate,
	stl_cd1400eiointr
};

/*
 *	Define the offsets within the register bank of a cd1400 based panel.
 *	These io address offsets are common to the EasyIO board as well.
 */
#define	EREG_ADDR	0
#define	EREG_DATA	4
#define	EREG_RXACK	5
#define	EREG_TXACK	6
#define	EREG_MDACK	7

#define	EREG_BANKSIZE	8

#define	CD1400_CLK	25000000
#define	CD1400_CLK8M	20000000

/*
 *	Define the cd1400 baud rate clocks. These are used when calculating
 *	what clock and divisor to use for the required baud rate. Also
 *	define the maximum baud rate allowed, and the default base baud.
 */
static int	stl_cd1400clkdivs[] = {
	CD1400_CLK0, CD1400_CLK1, CD1400_CLK2, CD1400_CLK3, CD1400_CLK4
};

/*****************************************************************************/

/*
 *	SC26198 UART specific data initization.
 */
static uart_t stl_sc26198uart = {
	stl_sc26198panelinit,
	stl_sc26198portinit,
	stl_sc26198setport,
	stl_sc26198getsignals,
	stl_sc26198setsignals,
	stl_sc26198enablerxtx,
	stl_sc26198startrxtx,
	stl_sc26198disableintrs,
	stl_sc26198sendbreak,
	stl_sc26198flowctrl,
	stl_sc26198sendflow,
	stl_sc26198flush,
	stl_sc26198datastate,
	stl_sc26198intr
};

/*
 *	Define the offsets within the register bank of a sc26198 based panel.
 */
#define	XP_DATA		0
#define	XP_ADDR		1
#define	XP_MODID	2
#define	XP_STATUS	2
#define	XP_IACK		3

#define	XP_BANKSIZE	4

/*
 *	Define the sc26198 baud rate table. Offsets within the table
 *	represent the actual baud rate selector of sc26198 registers.
 */
static unsigned int	sc26198_baudtable[] = {
	50, 75, 150, 200, 300, 450, 600, 900, 1200, 1800, 2400, 3600,
	4800, 7200, 9600, 14400, 19200, 28800, 38400, 57600, 115200,
	230400, 460800, 921600
};

#define	SC26198_NRBAUDS		ARRAY_SIZE(sc26198_baudtable)

/*****************************************************************************/

/*
 *	Define the driver info for a user level control device. Used mainly
 *	to get at port stats - only not using the port device itself.
 */
static struct file_operations	stl_fsiomem = {
	.owner		= THIS_MODULE,
	.ioctl		= stl_memioctl,
};

/*****************************************************************************/

static struct class *stallion_class;

/*
 *	Loadable module initialization stuff.
 */

static int __init stallion_module_init(void)
{
	unsigned long	flags;

#ifdef DEBUG
	printk("init_module()\n");
#endif

	save_flags(flags);
	cli();
	stl_init();
	restore_flags(flags);

	return 0;
}

/*****************************************************************************/

static void __exit stallion_module_exit(void)
{
	stlbrd_t	*brdp;
	stlpanel_t	*panelp;
	stlport_t	*portp;
	unsigned long	flags;
	int		i, j, k;

#ifdef DEBUG
	printk("cleanup_module()\n");
#endif

	printk(KERN_INFO "Unloading %s: version %s\n", stl_drvtitle,
		stl_drvversion);

	save_flags(flags);
	cli();

/*
 *	Free up all allocated resources used by the ports. This includes
 *	memory and interrupts. As part of this process we will also do
 *	a hangup on every open port - to try to flush out any processes
 *	hanging onto ports.
 */
	i = tty_unregister_driver(stl_serial);
	put_tty_driver(stl_serial);
	if (i) {
		printk("STALLION: failed to un-register tty driver, "
			"errno=%d\n", -i);
		restore_flags(flags);
		return;
	}
	for (i = 0; i < 4; i++) {
		devfs_remove("staliomem/%d", i);
		class_device_destroy(stallion_class, MKDEV(STL_SIOMEMMAJOR, i));
	}
	devfs_remove("staliomem");
	if ((i = unregister_chrdev(STL_SIOMEMMAJOR, "staliomem")))
		printk("STALLION: failed to un-register serial memory device, "
			"errno=%d\n", -i);
	class_destroy(stallion_class);

	kfree(stl_tmpwritebuf);

	for (i = 0; (i < stl_nrbrds); i++) {
		if ((brdp = stl_brds[i]) == (stlbrd_t *) NULL)
			continue;

		free_irq(brdp->irq, brdp);

		for (j = 0; (j < STL_MAXPANELS); j++) {
			panelp = brdp->panels[j];
			if (panelp == (stlpanel_t *) NULL)
				continue;
			for (k = 0; (k < STL_PORTSPERPANEL); k++) {
				portp = panelp->ports[k];
				if (portp == (stlport_t *) NULL)
					continue;
				if (portp->tty != (struct tty_struct *) NULL)
					stl_hangup(portp->tty);
				kfree(portp->tx.buf);
				kfree(portp);
			}
			kfree(panelp);
		}

		release_region(brdp->ioaddr1, brdp->iosize1);
		if (brdp->iosize2 > 0)
			release_region(brdp->ioaddr2, brdp->iosize2);

		kfree(brdp);
		stl_brds[i] = (stlbrd_t *) NULL;
	}

	restore_flags(flags);
}

module_init(stallion_module_init);
module_exit(stallion_module_exit);

/*****************************************************************************/

/*
 *	Check for any arguments passed in on the module load command line.
 */

static void stl_argbrds(void)
{
	stlconf_t	conf;
	stlbrd_t	*brdp;
	int		i;

#ifdef DEBUG
	printk("stl_argbrds()\n");
#endif

	for (i = stl_nrbrds; (i < stl_nargs); i++) {
		memset(&conf, 0, sizeof(conf));
		if (stl_parsebrd(&conf, stl_brdsp[i]) == 0)
			continue;
		if ((brdp = stl_allocbrd()) == (stlbrd_t *) NULL)
			continue;
		stl_nrbrds = i + 1;
		brdp->brdnr = i;
		brdp->brdtype = conf.brdtype;
		brdp->ioaddr1 = conf.ioaddr1;
		brdp->ioaddr2 = conf.ioaddr2;
		brdp->irq = conf.irq;
		brdp->irqtype = conf.irqtype;
		stl_brdinit(brdp);
	}
}

/*****************************************************************************/

/*
 *	Convert an ascii string number into an unsigned long.
 */

static unsigned long stl_atol(char *str)
{
	unsigned long	val;
	int		base, c;
	char		*sp;

	val = 0;
	sp = str;
	if ((*sp == '0') && (*(sp+1) == 'x')) {
		base = 16;
		sp += 2;
	} else if (*sp == '0') {
		base = 8;
		sp++;
	} else {
		base = 10;
	}

	for (; (*sp != 0); sp++) {
		c = (*sp > '9') ? (TOLOWER(*sp) - 'a' + 10) : (*sp - '0');
		if ((c < 0) || (c >= base)) {
			printk("STALLION: invalid argument %s\n", str);
			val = 0;
			break;
		}
		val = (val * base) + c;
	}
	return val;
}

/*****************************************************************************/

/*
 *	Parse the supplied argument string, into the board conf struct.
 */

static int stl_parsebrd(stlconf_t *confp, char **argp)
{
	char	*sp;
	int	i;

#ifdef DEBUG
	printk("stl_parsebrd(confp=%x,argp=%x)\n", (int) confp, (int) argp);
#endif

	if ((argp[0] == (char *) NULL) || (*argp[0] == 0))
		return 0;

	for (sp = argp[0], i = 0; ((*sp != 0) && (i < 25)); sp++, i++)
		*sp = TOLOWER(*sp);

	for (i = 0; i < ARRAY_SIZE(stl_brdstr); i++) {
		if (strcmp(stl_brdstr[i].name, argp[0]) == 0)
			break;
	}
	if (i == ARRAY_SIZE(stl_brdstr)) {
		printk("STALLION: unknown board name, %s?\n", argp[0]);
		return 0;
	}

	confp->brdtype = stl_brdstr[i].type;

	i = 1;
	if ((argp[i] != (char *) NULL) && (*argp[i] != 0))
		confp->ioaddr1 = stl_atol(argp[i]);
	i++;
	if (confp->brdtype == BRD_ECH) {
		if ((argp[i] != (char *) NULL) && (*argp[i] != 0))
			confp->ioaddr2 = stl_atol(argp[i]);
		i++;
	}
	if ((argp[i] != (char *) NULL) && (*argp[i] != 0))
		confp->irq = stl_atol(argp[i]);
	return 1;
}

/*****************************************************************************/

/*
 *	Allocate a new board structure. Fill out the basic info in it.
 */

static stlbrd_t *stl_allocbrd(void)
{
	stlbrd_t	*brdp;

	brdp = kzalloc(sizeof(stlbrd_t), GFP_KERNEL);
	if (!brdp) {
		printk("STALLION: failed to allocate memory (size=%d)\n",
			sizeof(stlbrd_t));
		return NULL;
	}

	brdp->magic = STL_BOARDMAGIC;
	return brdp;
}

/*****************************************************************************/

static int stl_open(struct tty_struct *tty, struct file *filp)
{
	stlport_t	*portp;
	stlbrd_t	*brdp;
	unsigned int	minordev;
	int		brdnr, panelnr, portnr, rc;

#ifdef DEBUG
	printk("stl_open(tty=%x,filp=%x): device=%s\n", (int) tty,
		(int) filp, tty->name);
#endif

	minordev = tty->index;
	brdnr = MINOR2BRD(minordev);
	if (brdnr >= stl_nrbrds)
		return -ENODEV;
	brdp = stl_brds[brdnr];
	if (brdp == (stlbrd_t *) NULL)
		return -ENODEV;
	minordev = MINOR2PORT(minordev);
	for (portnr = -1, panelnr = 0; (panelnr < STL_MAXPANELS); panelnr++) {
		if (brdp->panels[panelnr] == (stlpanel_t *) NULL)
			break;
		if (minordev < brdp->panels[panelnr]->nrports) {
			portnr = minordev;
			break;
		}
		minordev -= brdp->panels[panelnr]->nrports;
	}
	if (portnr < 0)
		return -ENODEV;

	portp = brdp->panels[panelnr]->ports[portnr];
	if (portp == (stlport_t *) NULL)
		return -ENODEV;

/*
 *	On the first open of the device setup the port hardware, and
 *	initialize the per port data structure.
 */
	portp->tty = tty;
	tty->driver_data = portp;
	portp->refcount++;

	if ((portp->flags & ASYNC_INITIALIZED) == 0) {
		if (!portp->tx.buf) {
			portp->tx.buf = kmalloc(STL_TXBUFSIZE, GFP_KERNEL);
			if (!portp->tx.buf)
				return -ENOMEM;
			portp->tx.head = portp->tx.buf;
			portp->tx.tail = portp->tx.buf;
		}
		stl_setport(portp, tty->termios);
		portp->sigs = stl_getsignals(portp);
		stl_setsignals(portp, 1, 1);
		stl_enablerxtx(portp, 1, 1);
		stl_startrxtx(portp, 1, 0);
		clear_bit(TTY_IO_ERROR, &tty->flags);
		portp->flags |= ASYNC_INITIALIZED;
	}

/*
 *	Check if this port is in the middle of closing. If so then wait
 *	until it is closed then return error status, based on flag settings.
 *	The sleep here does not need interrupt protection since the wakeup
 *	for it is done with the same context.
 */
	if (portp->flags & ASYNC_CLOSING) {
		interruptible_sleep_on(&portp->close_wait);
		if (portp->flags & ASYNC_HUP_NOTIFY)
			return -EAGAIN;
		return -ERESTARTSYS;
	}

/*
 *	Based on type of open being done check if it can overlap with any
 *	previous opens still in effect. If we are a normal serial device
 *	then also we might have to wait for carrier.
 */
	if (!(filp->f_flags & O_NONBLOCK)) {
		if ((rc = stl_waitcarrier(portp, filp)) != 0)
			return rc;
	}
	portp->flags |= ASYNC_NORMAL_ACTIVE;

	return 0;
}

/*****************************************************************************/

/*
 *	Possibly need to wait for carrier (DCD signal) to come high. Say
 *	maybe because if we are clocal then we don't need to wait...
 */

static int stl_waitcarrier(stlport_t *portp, struct file *filp)
{
	unsigned long	flags;
	int		rc, doclocal;

#ifdef DEBUG
	printk("stl_waitcarrier(portp=%x,filp=%x)\n", (int) portp, (int) filp);
#endif

	rc = 0;
	doclocal = 0;

	if (portp->tty->termios->c_cflag & CLOCAL)
		doclocal++;

	save_flags(flags);
	cli();
	portp->openwaitcnt++;
	if (! tty_hung_up_p(filp))
		portp->refcount--;

	for (;;) {
		stl_setsignals(portp, 1, 1);
		if (tty_hung_up_p(filp) ||
		    ((portp->flags & ASYNC_INITIALIZED) == 0)) {
			if (portp->flags & ASYNC_HUP_NOTIFY)
				rc = -EBUSY;
			else
				rc = -ERESTARTSYS;
			break;
		}
		if (((portp->flags & ASYNC_CLOSING) == 0) &&
		    (doclocal || (portp->sigs & TIOCM_CD))) {
			break;
		}
		if (signal_pending(current)) {
			rc = -ERESTARTSYS;
			break;
		}
		interruptible_sleep_on(&portp->open_wait);
	}

	if (! tty_hung_up_p(filp))
		portp->refcount++;
	portp->openwaitcnt--;
	restore_flags(flags);

	return rc;
}

/*****************************************************************************/

static void stl_close(struct tty_struct *tty, struct file *filp)
{
	stlport_t	*portp;
	unsigned long	flags;

#ifdef DEBUG
	printk("stl_close(tty=%x,filp=%x)\n", (int) tty, (int) filp);
#endif

	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;

	save_flags(flags);
	cli();
	if (tty_hung_up_p(filp)) {
		restore_flags(flags);
		return;
	}
	if ((tty->count == 1) && (portp->refcount != 1))
		portp->refcount = 1;
	if (portp->refcount-- > 1) {
		restore_flags(flags);
		return;
	}

	portp->refcount = 0;
	portp->flags |= ASYNC_CLOSING;

/*
 *	May want to wait for any data to drain before closing. The BUSY
 *	flag keeps track of whether we are still sending or not - it is
 *	very accurate for the cd1400, not quite so for the sc26198.
 *	(The sc26198 has no "end-of-data" interrupt only empty FIFO)
 */
	tty->closing = 1;
	if (portp->closing_wait != ASYNC_CLOSING_WAIT_NONE)
		tty_wait_until_sent(tty, portp->closing_wait);
	stl_waituntilsent(tty, (HZ / 2));

	portp->flags &= ~ASYNC_INITIALIZED;
	stl_disableintrs(portp);
	if (tty->termios->c_cflag & HUPCL)
		stl_setsignals(portp, 0, 0);
	stl_enablerxtx(portp, 0, 0);
	stl_flushbuffer(tty);
	portp->istate = 0;
	if (portp->tx.buf != (char *) NULL) {
		kfree(portp->tx.buf);
		portp->tx.buf = (char *) NULL;
		portp->tx.head = (char *) NULL;
		portp->tx.tail = (char *) NULL;
	}
	set_bit(TTY_IO_ERROR, &tty->flags);
	tty_ldisc_flush(tty);

	tty->closing = 0;
	portp->tty = (struct tty_struct *) NULL;

	if (portp->openwaitcnt) {
		if (portp->close_delay)
			msleep_interruptible(jiffies_to_msecs(portp->close_delay));
		wake_up_interruptible(&portp->open_wait);
	}

	portp->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
	wake_up_interruptible(&portp->close_wait);
	restore_flags(flags);
}

/*****************************************************************************/

/*
 *	Write routine. Take data and stuff it in to the TX ring queue.
 *	If transmit interrupts are not running then start them.
 */

static int stl_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
	stlport_t	*portp;
	unsigned int	len, stlen;
	unsigned char	*chbuf;
	char		*head, *tail;

#ifdef DEBUG
	printk("stl_write(tty=%x,buf=%x,count=%d)\n",
		(int) tty, (int) buf, count);
#endif

	if ((tty == (struct tty_struct *) NULL) ||
	    (stl_tmpwritebuf == (char *) NULL))
		return 0;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return 0;
	if (portp->tx.buf == (char *) NULL)
		return 0;

/*
 *	If copying direct from user space we must cater for page faults,
 *	causing us to "sleep" here for a while. To handle this copy in all
 *	the data we need now, into a local buffer. Then when we got it all
 *	copy it into the TX buffer.
 */
	chbuf = (unsigned char *) buf;

	head = portp->tx.head;
	tail = portp->tx.tail;
	if (head >= tail) {
		len = STL_TXBUFSIZE - (head - tail) - 1;
		stlen = STL_TXBUFSIZE - (head - portp->tx.buf);
	} else {
		len = tail - head - 1;
		stlen = len;
	}

	len = MIN(len, count);
	count = 0;
	while (len > 0) {
		stlen = MIN(len, stlen);
		memcpy(head, chbuf, stlen);
		len -= stlen;
		chbuf += stlen;
		count += stlen;
		head += stlen;
		if (head >= (portp->tx.buf + STL_TXBUFSIZE)) {
			head = portp->tx.buf;
			stlen = tail - head;
		}
	}
	portp->tx.head = head;

	clear_bit(ASYI_TXLOW, &portp->istate);
	stl_startrxtx(portp, -1, 1);

	return count;
}

/*****************************************************************************/

static void stl_putchar(struct tty_struct *tty, unsigned char ch)
{
	stlport_t	*portp;
	unsigned int	len;
	char		*head, *tail;

#ifdef DEBUG
	printk("stl_putchar(tty=%x,ch=%x)\n", (int) tty, (int) ch);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;
	if (portp->tx.buf == (char *) NULL)
		return;

	head = portp->tx.head;
	tail = portp->tx.tail;

	len = (head >= tail) ? (STL_TXBUFSIZE - (head - tail)) : (tail - head);
	len--;

	if (len > 0) {
		*head++ = ch;
		if (head >= (portp->tx.buf + STL_TXBUFSIZE))
			head = portp->tx.buf;
	}	
	portp->tx.head = head;
}

/*****************************************************************************/

/*
 *	If there are any characters in the buffer then make sure that TX
 *	interrupts are on and get'em out. Normally used after the putchar
 *	routine has been called.
 */

static void stl_flushchars(struct tty_struct *tty)
{
	stlport_t	*portp;

#ifdef DEBUG
	printk("stl_flushchars(tty=%x)\n", (int) tty);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;
	if (portp->tx.buf == (char *) NULL)
		return;

#if 0
	if (tty->stopped || tty->hw_stopped ||
	    (portp->tx.head == portp->tx.tail))
		return;
#endif
	stl_startrxtx(portp, -1, 1);
}

/*****************************************************************************/

static int stl_writeroom(struct tty_struct *tty)
{
	stlport_t	*portp;
	char		*head, *tail;

#ifdef DEBUG
	printk("stl_writeroom(tty=%x)\n", (int) tty);
#endif

	if (tty == (struct tty_struct *) NULL)
		return 0;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return 0;
	if (portp->tx.buf == (char *) NULL)
		return 0;

	head = portp->tx.head;
	tail = portp->tx.tail;
	return ((head >= tail) ? (STL_TXBUFSIZE - (head - tail) - 1) : (tail - head - 1));
}

/*****************************************************************************/

/*
 *	Return number of chars in the TX buffer. Normally we would just
 *	calculate the number of chars in the buffer and return that, but if
 *	the buffer is empty and TX interrupts are still on then we return
 *	that the buffer still has 1 char in it. This way whoever called us
 *	will not think that ALL chars have drained - since the UART still
 *	must have some chars in it (we are busy after all).
 */

static int stl_charsinbuffer(struct tty_struct *tty)
{
	stlport_t	*portp;
	unsigned int	size;
	char		*head, *tail;

#ifdef DEBUG
	printk("stl_charsinbuffer(tty=%x)\n", (int) tty);
#endif

	if (tty == (struct tty_struct *) NULL)
		return 0;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return 0;
	if (portp->tx.buf == (char *) NULL)
		return 0;

	head = portp->tx.head;
	tail = portp->tx.tail;
	size = (head >= tail) ? (head - tail) : (STL_TXBUFSIZE - (tail - head));
	if ((size == 0) && test_bit(ASYI_TXBUSY, &portp->istate))
		size = 1;
	return size;
}

/*****************************************************************************/

/*
 *	Generate the serial struct info.
 */

static int stl_getserial(stlport_t *portp, struct serial_struct __user *sp)
{
	struct serial_struct	sio;
	stlbrd_t		*brdp;

#ifdef DEBUG
	printk("stl_getserial(portp=%x,sp=%x)\n", (int) portp, (int) sp);
#endif

	memset(&sio, 0, sizeof(struct serial_struct));
	sio.line = portp->portnr;
	sio.port = portp->ioaddr;
	sio.flags = portp->flags;
	sio.baud_base = portp->baud_base;
	sio.close_delay = portp->close_delay;
	sio.closing_wait = portp->closing_wait;
	sio.custom_divisor = portp->custom_divisor;
	sio.hub6 = 0;
	if (portp->uartp == &stl_cd1400uart) {
		sio.type = PORT_CIRRUS;
		sio.xmit_fifo_size = CD1400_TXFIFOSIZE;
	} else {
		sio.type = PORT_UNKNOWN;
		sio.xmit_fifo_size = SC26198_TXFIFOSIZE;
	}

	brdp = stl_brds[portp->brdnr];
	if (brdp != (stlbrd_t *) NULL)
		sio.irq = brdp->irq;

	return copy_to_user(sp, &sio, sizeof(struct serial_struct)) ? -EFAULT : 0;
}

/*****************************************************************************/

/*
 *	Set port according to the serial struct info.
 *	At this point we do not do any auto-configure stuff, so we will
 *	just quietly ignore any requests to change irq, etc.
 */

static int stl_setserial(stlport_t *portp, struct serial_struct __user *sp)
{
	struct serial_struct	sio;

#ifdef DEBUG
	printk("stl_setserial(portp=%x,sp=%x)\n", (int) portp, (int) sp);
#endif

	if (copy_from_user(&sio, sp, sizeof(struct serial_struct)))
		return -EFAULT;
	if (!capable(CAP_SYS_ADMIN)) {
		if ((sio.baud_base != portp->baud_base) ||
		    (sio.close_delay != portp->close_delay) ||
		    ((sio.flags & ~ASYNC_USR_MASK) !=
		    (portp->flags & ~ASYNC_USR_MASK)))
			return -EPERM;
	} 

	portp->flags = (portp->flags & ~ASYNC_USR_MASK) |
		(sio.flags & ASYNC_USR_MASK);
	portp->baud_base = sio.baud_base;
	portp->close_delay = sio.close_delay;
	portp->closing_wait = sio.closing_wait;
	portp->custom_divisor = sio.custom_divisor;
	stl_setport(portp, portp->tty->termios);
	return 0;
}

/*****************************************************************************/

static int stl_tiocmget(struct tty_struct *tty, struct file *file)
{
	stlport_t	*portp;

	if (tty == (struct tty_struct *) NULL)
		return -ENODEV;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return -ENODEV;
	if (tty->flags & (1 << TTY_IO_ERROR))
		return -EIO;

	return stl_getsignals(portp);
}

static int stl_tiocmset(struct tty_struct *tty, struct file *file,
			unsigned int set, unsigned int clear)
{
	stlport_t	*portp;
	int rts = -1, dtr = -1;

	if (tty == (struct tty_struct *) NULL)
		return -ENODEV;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return -ENODEV;
	if (tty->flags & (1 << TTY_IO_ERROR))
		return -EIO;

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

	stl_setsignals(portp, dtr, rts);
	return 0;
}

static int stl_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
{
	stlport_t	*portp;
	unsigned int	ival;
	int		rc;
	void __user *argp = (void __user *)arg;

#ifdef DEBUG
	printk("stl_ioctl(tty=%x,file=%x,cmd=%x,arg=%x)\n",
		(int) tty, (int) file, cmd, (int) arg);
#endif

	if (tty == (struct tty_struct *) NULL)
		return -ENODEV;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return -ENODEV;

	if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
 	    (cmd != COM_GETPORTSTATS) && (cmd != COM_CLRPORTSTATS)) {
		if (tty->flags & (1 << TTY_IO_ERROR))
			return -EIO;
	}

	rc = 0;

	switch (cmd) {
	case TIOCGSOFTCAR:
		rc = put_user(((tty->termios->c_cflag & CLOCAL) ? 1 : 0),
			(unsigned __user *) argp);
		break;
	case TIOCSSOFTCAR:
		if (get_user(ival, (unsigned int __user *) arg))
			return -EFAULT;
		tty->termios->c_cflag =
				(tty->termios->c_cflag & ~CLOCAL) |
				(ival ? CLOCAL : 0);
		break;
	case TIOCGSERIAL:
		rc = stl_getserial(portp, argp);
		break;
	case TIOCSSERIAL:
		rc = stl_setserial(portp, argp);
		break;
	case COM_GETPORTSTATS:
		rc = stl_getportstats(portp, argp);
		break;
	case COM_CLRPORTSTATS:
		rc = stl_clrportstats(portp, argp);
		break;
	case TIOCSERCONFIG:
	case TIOCSERGWILD:
	case TIOCSERSWILD:
	case TIOCSERGETLSR:
	case TIOCSERGSTRUCT:
	case TIOCSERGETMULTI:
	case TIOCSERSETMULTI:
	default:
		rc = -ENOIOCTLCMD;
		break;
	}

	return rc;
}

/*****************************************************************************/

static void stl_settermios(struct tty_struct *tty, struct termios *old)
{
	stlport_t	*portp;
	struct termios	*tiosp;

#ifdef DEBUG
	printk("stl_settermios(tty=%x,old=%x)\n", (int) tty, (int) old);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;

	tiosp = tty->termios;
	if ((tiosp->c_cflag == old->c_cflag) &&
	    (tiosp->c_iflag == old->c_iflag))
		return;

	stl_setport(portp, tiosp);
	stl_setsignals(portp, ((tiosp->c_cflag & (CBAUD & ~CBAUDEX)) ? 1 : 0),
		-1);
	if ((old->c_cflag & CRTSCTS) && ((tiosp->c_cflag & CRTSCTS) == 0)) {
		tty->hw_stopped = 0;
		stl_start(tty);
	}
	if (((old->c_cflag & CLOCAL) == 0) && (tiosp->c_cflag & CLOCAL))
		wake_up_interruptible(&portp->open_wait);
}

/*****************************************************************************/

/*
 *	Attempt to flow control who ever is sending us data. Based on termios
 *	settings use software or/and hardware flow control.
 */

static void stl_throttle(struct tty_struct *tty)
{
	stlport_t	*portp;

#ifdef DEBUG
	printk("stl_throttle(tty=%x)\n", (int) tty);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;
	stl_flowctrl(portp, 0);
}

/*****************************************************************************/

/*
 *	Unflow control the device sending us data...
 */

static void stl_unthrottle(struct tty_struct *tty)
{
	stlport_t	*portp;

#ifdef DEBUG
	printk("stl_unthrottle(tty=%x)\n", (int) tty);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;
	stl_flowctrl(portp, 1);
}

/*****************************************************************************/

/*
 *	Stop the transmitter. Basically to do this we will just turn TX
 *	interrupts off.
 */

static void stl_stop(struct tty_struct *tty)
{
	stlport_t	*portp;

#ifdef DEBUG
	printk("stl_stop(tty=%x)\n", (int) tty);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;
	stl_startrxtx(portp, -1, 0);
}

/*****************************************************************************/

/*
 *	Start the transmitter again. Just turn TX interrupts back on.
 */

static void stl_start(struct tty_struct *tty)
{
	stlport_t	*portp;

#ifdef DEBUG
	printk("stl_start(tty=%x)\n", (int) tty);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;
	stl_startrxtx(portp, -1, 1);
}

/*****************************************************************************/

/*
 *	Hangup this port. This is pretty much like closing the port, only
 *	a little more brutal. No waiting for data to drain. Shutdown the
 *	port and maybe drop signals.
 */

static void stl_hangup(struct tty_struct *tty)
{
	stlport_t	*portp;

#ifdef DEBUG
	printk("stl_hangup(tty=%x)\n", (int) tty);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;

	portp->flags &= ~ASYNC_INITIALIZED;
	stl_disableintrs(portp);
	if (tty->termios->c_cflag & HUPCL)
		stl_setsignals(portp, 0, 0);
	stl_enablerxtx(portp, 0, 0);
	stl_flushbuffer(tty);
	portp->istate = 0;
	set_bit(TTY_IO_ERROR, &tty->flags);
	if (portp->tx.buf != (char *) NULL) {
		kfree(portp->tx.buf);
		portp->tx.buf = (char *) NULL;
		portp->tx.head = (char *) NULL;
		portp->tx.tail = (char *) NULL;
	}
	portp->tty = (struct tty_struct *) NULL;
	portp->flags &= ~ASYNC_NORMAL_ACTIVE;
	portp->refcount = 0;
	wake_up_interruptible(&portp->open_wait);
}

/*****************************************************************************/

static void stl_flushbuffer(struct tty_struct *tty)
{
	stlport_t	*portp;

#ifdef DEBUG
	printk("stl_flushbuffer(tty=%x)\n", (int) tty);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;

	stl_flush(portp);
	tty_wakeup(tty);
}

/*****************************************************************************/

static void stl_breakctl(struct tty_struct *tty, int state)
{
	stlport_t	*portp;

#ifdef DEBUG
	printk("stl_breakctl(tty=%x,state=%d)\n", (int) tty, state);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;

	stl_sendbreak(portp, ((state == -1) ? 1 : 2));
}

/*****************************************************************************/

static void stl_waituntilsent(struct tty_struct *tty, int timeout)
{
	stlport_t	*portp;
	unsigned long	tend;

#ifdef DEBUG
	printk("stl_waituntilsent(tty=%x,timeout=%d)\n", (int) tty, timeout);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;

	if (timeout == 0)
		timeout = HZ;
	tend = jiffies + timeout;

	while (stl_datastate(portp)) {
		if (signal_pending(current))
			break;
		msleep_interruptible(20);
		if (time_after_eq(jiffies, tend))
			break;
	}
}

/*****************************************************************************/

static void stl_sendxchar(struct tty_struct *tty, char ch)
{
	stlport_t	*portp;

#ifdef DEBUG
	printk("stl_sendxchar(tty=%x,ch=%x)\n", (int) tty, ch);
#endif

	if (tty == (struct tty_struct *) NULL)
		return;
	portp = tty->driver_data;
	if (portp == (stlport_t *) NULL)
		return;

	if (ch == STOP_CHAR(tty))
		stl_sendflow(portp, 0);
	else if (ch == START_CHAR(tty))
		stl_sendflow(portp, 1);
	else
		stl_putchar(tty, ch);
}

/*****************************************************************************/

#define	MAXLINE		80

/*
 *	Format info for a specified port. The line is deliberately limited
 *	to 80 characters. (If it is too long it will be truncated, if too
 *	short then padded with spaces).
 */

static int stl_portinfo(stlport_t *portp, int portnr, char *pos)
{
	char	*sp;
	int	sigs, cnt;

	sp = pos;
	sp += sprintf(sp, "%d: uart:%s tx:%d rx:%d",
		portnr, (portp->hwid == 1) ? "SC26198" : "CD1400",
		(int) portp->stats.txtotal, (int) portp->stats.rxtotal);

	if (portp->stats.rxframing)
		sp += sprintf(sp, " fe:%d", (int) portp->stats.rxframing);
	if (portp->stats.rxparity)
		sp += sprintf(sp, " pe:%d", (int) portp->stats.rxparity);
	if (portp->stats.rxbreaks)
		sp += sprintf(sp, " brk:%d", (int) portp->stats.rxbreaks);
	if (portp->stats.rxoverrun)
		sp += sprintf(sp, " oe:%d", (int) portp->stats.rxoverrun);

	sigs = stl_getsignals(portp);
	cnt = sprintf(sp, "%s%s%s%s%s ",
		(sigs & TIOCM_RTS) ? "|RTS" : "",
		(sigs & TIOCM_CTS) ? "|CTS" : "",
		(sigs & TIOCM_DTR) ? "|DTR" : "",
		(sigs & TIOCM_CD) ? "|DCD" : "",
		(sigs & TIOCM_DSR) ? "|DSR" : "");
	*sp = ' ';
	sp += cnt;

	for (cnt = (sp - pos); (cnt < (MAXLINE - 1)); cnt++)
		*sp++ = ' ';
	if (cnt >= MAXLINE)
		pos[(MAXLINE - 2)] = '+';
	pos[(MAXLINE - 1)] = '\n';

	return MAXLINE;
}

/*****************************************************************************/

/*
 *	Port info, read from the /proc file system.
 */

static int stl_readproc(char *page, char **start, off_t off, int count, int *eof, void *data)
{
	stlbrd_t	*brdp;
	stlpanel_t	*panelp;
	stlport_t	*portp;
	int		brdnr, panelnr, portnr, totalport;
	int		curoff, maxoff;
	char		*pos;

#ifdef DEBUG
	printk("stl_readproc(page=%x,start=%x,off=%x,count=%d,eof=%x,"
		"data=%x\n", (int) page, (int) start, (int) off, count,
		(int) eof, (int) data);
#endif

	pos = page;
	totalport = 0;
	curoff = 0;

	if (off == 0) {
		pos += sprintf(pos, "%s: version %s", stl_drvtitle,
			stl_drvversion);
		while (pos < (page + MAXLINE - 1))
			*pos++ = ' ';
		*pos++ = '\n';
	}
	curoff =  MAXLINE;

/*
 *	We scan through for each board, panel and port. The offset is
 *	calculated on the fly, and irrelevant ports are skipped.
 */
	for (brdnr = 0; (brdnr < stl_nrbrds); brdnr++) {
		brdp = stl_brds[brdnr];
		if (brdp == (stlbrd_t *) NULL)
			continue;
		if (brdp->state == 0)
			continue;

		maxoff = curoff + (brdp->nrports * MAXLINE);
		if (off >= maxoff) {
			curoff = maxoff;
			continue;
		}

		totalport = brdnr * STL_MAXPORTS;
		for (panelnr = 0; (panelnr < brdp->nrpanels); panelnr++) {
			panelp = brdp->panels[panelnr];
			if (panelp == (stlpanel_t *) NULL)
				continue;

			maxoff = curoff + (panelp->nrports * MAXLINE);
			if (off >= maxoff) {
				curoff = maxoff;
				totalport += panelp->nrports;
				continue;
			}

			for (portnr = 0; (portnr < panelp->nrports); portnr++,
			    totalport++) {
				portp = panelp->ports[portnr];
				if (portp == (stlport_t *) NULL)
					continue;
				if (off >= (curoff += MAXLINE))
					continue;
				if ((pos - page + MAXLINE) > count)
					goto stl_readdone;
				pos += stl_portinfo(portp, totalport, pos);
			}
		}
	}

	*eof = 1;

stl_readdone:
	*start = page;
	return (pos - page);
}

/*****************************************************************************/

/*
 *	All board interrupts are vectored through here first. This code then
 *	calls off to the approrpriate board interrupt handlers.
 */

static irqreturn_t stl_intr(int irq, void *dev_id, struct pt_regs *regs)
{
	stlbrd_t	*brdp = (stlbrd_t *) dev_id;

#ifdef DEBUG
	printk("stl_intr(brdp=%x,irq=%d,regs=%x)\n", (int) brdp, irq,
	    (int) regs);
#endif

	return IRQ_RETVAL((* brdp->isr)(brdp));
}

/*****************************************************************************/

/*
 *	Interrupt service routine for EasyIO board types.
 */

static int stl_eiointr(stlbrd_t *brdp)
{
	stlpanel_t	*panelp;
	unsigned int	iobase;
	int		handled = 0;

	panelp = brdp->panels[0];
	iobase = panelp->iobase;
	while (inb(brdp->iostatus) & EIO_INTRPEND) {
		handled = 1;
		(* panelp->isr)(panelp, iobase);
	}
	return handled;
}

/*****************************************************************************/

/*
 *	Interrupt service routine for ECH-AT board types.
 */

static int stl_echatintr(stlbrd_t *brdp)
{
	stlpanel_t	*panelp;
	unsigned int	ioaddr;
	int		bnknr;
	int		handled = 0;

	outb((brdp->ioctrlval | ECH_BRDENABLE), brdp->ioctrl);

	while (inb(brdp->iostatus) & ECH_INTRPEND) {
		handled = 1;
		for (bnknr = 0; (bnknr < brdp->nrbnks); bnknr++) {
			ioaddr = brdp->bnkstataddr[bnknr];
			if (inb(ioaddr) & ECH_PNLINTRPEND) {
				panelp = brdp->bnk2panel[bnknr];
				(* panelp->isr)(panelp, (ioaddr & 0xfffc));
			}
		}
	}

	outb((brdp->ioctrlval | ECH_BRDDISABLE), brdp->ioctrl);

	return handled;
}

/*****************************************************************************/

/*
 *	Interrupt service routine for ECH-MCA board types.
 */

static int stl_echmcaintr(stlbrd_t *brdp)
{
	stlpanel_t	*panelp;
	unsigned int	ioaddr;
	int		bnknr;
	int		handled = 0;

	while (inb(brdp->iostatus) & ECH_INTRPEND) {
		handled = 1;
		for (bnknr = 0; (bnknr < brdp->nrbnks); bnknr++) {
			ioaddr = brdp->bnkstataddr[bnknr];
			if (inb(ioaddr) & ECH_PNLINTRPEND) {
				panelp = brdp->bnk2panel[bnknr];
				(* panelp->isr)(panelp, (ioaddr & 0xfffc));
			}
		}
	}
	return handled;
}

/*****************************************************************************/

/*
 *	Interrupt service routine for ECH-PCI board types.
 */

static int stl_echpciintr(stlbrd_t *brdp)
{
	stlpanel_t	*panelp;
	unsigned int	ioaddr;
	int		bnknr, recheck;
	int		handled = 0;

	while (1) {
		recheck = 0;
		for (bnknr = 0; (bnknr < brdp->nrbnks); bnknr++) {
			outb(brdp->bnkpageaddr[bnknr], brdp->ioctrl);
			ioaddr = brdp->bnkstataddr[bnknr];
			if (inb(ioaddr) & ECH_PNLINTRPEND) {
				panelp = brdp->bnk2panel[bnknr];
				(* panelp->isr)(panelp, (ioaddr & 0xfffc));
				recheck++;
				handled = 1;
			}
		}
		if (! recheck)
			break;
	}
	return handled;
}

/*****************************************************************************/

/*
 *	Interrupt service routine for ECH-8/64-PCI board types.
 */

static int stl_echpci64intr(stlbrd_t *brdp)
{
	stlpanel_t	*panelp;
	unsigned int	ioaddr;
	int		bnknr;
	int		handled = 0;

	while (inb(brdp->ioctrl) & 0x1) {
		handled = 1;
		for (bnknr = 0; (bnknr < brdp->nrbnks); bnknr++) {
			ioaddr = brdp->bnkstataddr[bnknr];
			if (inb(ioaddr) & ECH_PNLINTRPEND) {
				panelp = brdp->bnk2panel[bnknr];
				(* panelp->isr)(panelp, (ioaddr & 0xfffc));
			}
		}
	}

	return handled;
}

/*****************************************************************************/

/*
 *	Service an off-level request for some channel.
 */
static void stl_offintr(void *private)
{
	stlport_t		*portp;
	struct tty_struct	*tty;
	unsigned int		oldsigs;

	portp = private;

#ifdef DEBUG
	printk("stl_offintr(portp=%x)\n", (int) portp);
#endif

	if (portp == (stlport_t *) NULL)
		return;

	tty = portp->tty;
	if (tty == (struct tty_struct *) NULL)
		return;

	lock_kernel();
	if (test_bit(ASYI_TXLOW, &portp->istate)) {
		tty_wakeup(tty);
	}
	if (test_bit(ASYI_DCDCHANGE, &portp->istate)) {
		clear_bit(ASYI_DCDCHANGE, &portp->istate);
		oldsigs = portp->sigs;
		portp->sigs = stl_getsignals(portp);
		if ((portp->sigs & TIOCM_CD) && ((oldsigs & TIOCM_CD) == 0))
			wake_up_interruptible(&portp->open_wait);
		if ((oldsigs & TIOCM_CD) && ((portp->sigs & TIOCM_CD) == 0)) {
			if (portp->flags & ASYNC_CHECK_CD)
				tty_hangup(tty);	/* FIXME: module removal race here - AKPM */
		}
	}
	unlock_kernel();
}

/*****************************************************************************/

/*
 *	Initialize all the ports on a panel.
 */

static int __init stl_initports(stlbrd_t *brdp, stlpanel_t *panelp)
{
	stlport_t	*portp;
	int		chipmask, i;

#ifdef DEBUG
	printk("stl_initports(brdp=%x,panelp=%x)\n", (int) brdp, (int) panelp);
#endif

	chipmask = stl_panelinit(brdp, panelp);

/*
 *	All UART's are initialized (if found!). Now go through and setup
 *	each ports data structures.
 */
	for (i = 0; (i < panelp->nrports); i++) {
		portp = kzalloc(sizeof(stlport_t), GFP_KERNEL);
		if (!portp) {
			printk("STALLION: failed to allocate memory "
				"(size=%d)\n", sizeof(stlport_t));
			break;
		}

		portp->magic = STL_PORTMAGIC;
		portp->portnr = i;
		portp->brdnr = panelp->brdnr;
		portp->panelnr = panelp->panelnr;
		portp->uartp = panelp->uartp;
		portp->clk = brdp->clk;
		portp->baud_base = STL_BAUDBASE;
		portp->close_delay = STL_CLOSEDELAY;
		portp->closing_wait = 30 * HZ;
		INIT_WORK(&portp->tqueue, stl_offintr, portp);
		init_waitqueue_head(&portp->open_wait);
		init_waitqueue_head(&portp->close_wait);
		portp->stats.brd = portp->brdnr;
		portp->stats.panel = portp->panelnr;
		portp->stats.port = portp->portnr;
		panelp->ports[i] = portp;
		stl_portinit(brdp, panelp, portp);
	}

	return(0);
}

/*****************************************************************************/

/*
 *	Try to find and initialize an EasyIO board.
 */

static inline int stl_initeio(stlbrd_t *brdp)
{
	stlpanel_t	*panelp;
	unsigned int	status;
	char		*name;
	int		rc;

#ifdef DEBUG
	printk("stl_initeio(brdp=%x)\n", (int) brdp);
#endif

	brdp->ioctrl = brdp->ioaddr1 + 1;
	brdp->iostatus = brdp->ioaddr1 + 2;

	status = inb(brdp->iostatus);
	if ((status & EIO_IDBITMASK) == EIO_MK3)
		brdp->ioctrl++;

/*
 *	Handle board specific stuff now. The real difference is PCI
 *	or not PCI.
 */
	if (brdp->brdtype == BRD_EASYIOPCI) {
		brdp->iosize1 = 0x80;
		brdp->iosize2 = 0x80;
		name = "serial(EIO-PCI)";
		outb(0x41, (brdp->ioaddr2 + 0x4c));
	} else {
		brdp->iosize1 = 8;
		name = "serial(EIO)";
		if ((brdp->irq < 0) || (brdp->irq > 15) ||
		    (stl_vecmap[brdp->irq] == (unsigned char) 0xff)) {
			printk("STALLION: invalid irq=%d for brd=%d\n",
				brdp->irq, brdp->brdnr);
			return(-EINVAL);
		}
		outb((stl_vecmap[brdp->irq] | EIO_0WS |
			((brdp->irqtype) ? EIO_INTLEVEL : EIO_INTEDGE)),
			brdp->ioctrl);
	}

	if (!request_region(brdp->ioaddr1, brdp->iosize1, name)) {
		printk(KERN_WARNING "STALLION: Warning, board %d I/O address "
			"%x conflicts with another device\n", brdp->brdnr, 
			brdp->ioaddr1);
		return(-EBUSY);
	}
	
	if (brdp->iosize2 > 0)
		if (!request_region(brdp->ioaddr2, brdp->iosize2, name)) {
			printk(KERN_WARNING "STALLION: Warning, board %d I/O "
				"address %x conflicts with another device\n",
				brdp->brdnr, brdp->ioaddr2);
			printk(KERN_WARNING "STALLION: Warning, also "
				"releasing board %d I/O address %x \n", 
				brdp->brdnr, brdp->ioaddr1);
			release_region(brdp->ioaddr1, brdp->iosize1);
        		return(-EBUSY);
		}

/*
 *	Everything looks OK, so let's go ahead and probe for the hardware.
 */
	brdp->clk = CD1400_CLK;
	brdp->isr = stl_eiointr;

	switch (status & EIO_IDBITMASK) {
	case EIO_8PORTM:
		brdp->clk = CD1400_CLK8M;
		/* fall thru */
	case EIO_8PORTRS:
	case EIO_8PORTDI:
		brdp->nrports = 8;
		break;
	case EIO_4PORTRS:
		brdp->nrports = 4;
		break;
	case EIO_MK3:
		switch (status & EIO_BRDMASK) {
		case ID_BRD4:
			brdp->nrports = 4;
			break;
		case ID_BRD8:
			brdp->nrports = 8;
			break;
		case ID_BRD16:
			brdp->nrports = 16;
			break;
		default:
			return(-ENODEV);
		}
		break;
	default:
		return(-ENODEV);
	}

/*
 *	We have verified that the board is actually present, so now we
 *	can complete the setup.
 */

	panelp = kzalloc(sizeof(stlpanel_t), GFP_KERNEL);
	if (!panelp) {
		printk(KERN_WARNING "STALLION: failed to allocate memory "
			"(size=%d)\n", sizeof(stlpanel_t));
		return -ENOMEM;
	}

	panelp->magic = STL_PANELMAGIC;
	panelp->brdnr = brdp->brdnr;
	panelp->panelnr = 0;
	panelp->nrports = brdp->nrports;
	panelp->iobase = brdp->ioaddr1;
	panelp->hwid = status;
	if ((status & EIO_IDBITMASK) == EIO_MK3) {
		panelp->uartp = (void *) &stl_sc26198uart;
		panelp->isr = stl_sc26198intr;
	} else {
		panelp->uartp = (void *) &stl_cd1400uart;
		panelp->isr = stl_cd1400eiointr;
	}

	brdp->panels[0] = panelp;
	brdp->nrpanels = 1;
	brdp->state |= BRD_FOUND;
	brdp->hwid = status;
	if (request_irq(brdp->irq, stl_intr, SA_SHIRQ, name, brdp) != 0) {
		printk("STALLION: failed to register interrupt "
		    "routine for %s irq=%d\n", name, brdp->irq);
		rc = -ENODEV;
	} else {
		rc = 0;
	}
	return rc;
}

/*****************************************************************************/

/*
 *	Try to find an ECH board and initialize it. This code is capable of
 *	dealing with all types of ECH board.
 */

static inline int stl_initech(stlbrd_t *brdp)
{
	stlpanel_t	*panelp;
	unsigned int	status, nxtid, ioaddr, conflict;
	int		panelnr, banknr, i;
	char		*name;

#ifdef DEBUG
	printk("stl_initech(brdp=%x)\n", (int) brdp);
#endif

	status = 0;
	conflict = 0;

/*
 *	Set up the initial board register contents for boards. This varies a
 *	bit between the different board types. So we need to handle each
 *	separately. Also do a check that the supplied IRQ is good.
 */
	switch (brdp->brdtype) {

	case BRD_ECH:
		brdp->isr = stl_echatintr;
		brdp->ioctrl = brdp->ioaddr1 + 1;
		brdp->iostatus = brdp->ioaddr1 + 1;
		status = inb(brdp->iostatus);
		if ((status & ECH_IDBITMASK) != ECH_ID)
			return(-ENODEV);
		if ((brdp->irq < 0) || (brdp->irq > 15) ||
		    (stl_vecmap[brdp->irq] == (unsigned char) 0xff)) {
			printk("STALLION: invalid irq=%d for brd=%d\n",
				brdp->irq, brdp->brdnr);
			return(-EINVAL);
		}
		status = ((brdp->ioaddr2 & ECH_ADDR2MASK) >> 1);
		status |= (stl_vecmap[brdp->irq] << 1);
		outb((status | ECH_BRDRESET), brdp->ioaddr1);
		brdp->ioctrlval = ECH_INTENABLE |
			((brdp->irqtype) ? ECH_INTLEVEL : ECH_INTEDGE);
		for (i = 0; (i < 10); i++)
			outb((brdp->ioctrlval | ECH_BRDENABLE), brdp->ioctrl);
		brdp->iosize1 = 2;
		brdp->iosize2 = 32;
		name = "serial(EC8/32)";
		outb(status, brdp->ioaddr1);
		break;

	case BRD_ECHMC:
		brdp->isr = stl_echmcaintr;
		brdp->ioctrl = brdp->ioaddr1 + 0x20;
		brdp->iostatus = brdp->ioctrl;
		status = inb(brdp->iostatus);
		if ((status & ECH_IDBITMASK) != ECH_ID)
			return(-ENODEV);
		if ((brdp->irq < 0) || (brdp->irq > 15) ||
		    (stl_vecmap[brdp->irq] == (unsigned char) 0xff)) {
			printk("STALLION: invalid irq=%d for brd=%d\n",
				brdp->irq, brdp->brdnr);
			return(-EINVAL);
		}
		outb(ECHMC_BRDRESET, brdp->ioctrl);
		outb(ECHMC_INTENABLE, brdp->ioctrl);
		brdp->iosize1 = 64;
		name = "serial(EC8/32-MC)";
		break;

	case BRD_ECHPCI:
		brdp->isr = stl_echpciintr;
		brdp->ioctrl = brdp->ioaddr1 + 2;
		brdp->iosize1 = 4;
		brdp->iosize2 = 8;
		name = "serial(EC8/32-PCI)";
		break;

	case BRD_ECH64PCI:
		brdp->isr = stl_echpci64intr;
		brdp->ioctrl = brdp->ioaddr2 + 0x40;
		outb(0x43, (brdp->ioaddr1 + 0x4c));
		brdp->iosize1 = 0x80;
		brdp->iosize2 = 0x80;
		name = "serial(EC8/64-PCI)";
		break;

	default:
		printk("STALLION: unknown board type=%d\n", brdp->brdtype);
		return(-EINVAL);
		break;
	}

/*
 *	Check boards for possible IO address conflicts and return fail status 
 * 	if an IO conflict found.
 */
	if (!request_region(brdp->ioaddr1, brdp->iosize1, name)) {
		printk(KERN_WARNING "STALLION: Warning, board %d I/O address "
			"%x conflicts with another device\n", brdp->brdnr, 
			brdp->ioaddr1);
		return(-EBUSY);
	}
	
	if (brdp->iosize2 > 0)
		if (!request_region(brdp->ioaddr2, brdp->iosize2, name)) {
			printk(KERN_WARNING "STALLION: Warning, board %d I/O "
				"address %x conflicts with another device\n",
				brdp->brdnr, brdp->ioaddr2);
			printk(KERN_WARNING "STALLION: Warning, also "
				"releasing board %d I/O address %x \n", 
				brdp->brdnr, brdp->ioaddr1);
			release_region(brdp->ioaddr1, brdp->iosize1);
			return(-EBUSY);
		}

/*
 *	Scan through the secondary io address space looking for panels.
 *	As we find'em allocate and initialize panel structures for each.
 */
	brdp->clk = CD1400_CLK;
	brdp->hwid = status;

	ioaddr = brdp->ioaddr2;
	banknr = 0;
	panelnr = 0;
	nxtid = 0;

	for (i = 0; (i < STL_MAXPANELS); i++) {
		if (brdp->brdtype == BRD_ECHPCI) {
			outb(nxtid, brdp->ioctrl);
			ioaddr = brdp->ioaddr2;
		}
		status = inb(ioaddr + ECH_PNLSTATUS);
		if ((status & ECH_PNLIDMASK) != nxtid)
			break;
		panelp = kzalloc(sizeof(stlpanel_t), GFP_KERNEL);
		if (!panelp) {
			printk("STALLION: failed to allocate memory "
				"(size=%d)\n", sizeof(stlpanel_t));
			break;
		}
		panelp->magic = STL_PANELMAGIC;
		panelp->brdnr = brdp->brdnr;
		panelp->panelnr = panelnr;
		panelp->iobase = ioaddr;
		panelp->pagenr = nxtid;
		panelp->hwid = status;
		brdp->bnk2panel[banknr] = panelp;
		brdp->bnkpageaddr[banknr] = nxtid;
		brdp->bnkstataddr[banknr++] = ioaddr + ECH_PNLSTATUS;

		if (status & ECH_PNLXPID) {
			panelp->uartp = (void *) &stl_sc26198uart;
			panelp->isr = stl_sc26198intr;
			if (status & ECH_PNL16PORT) {
				panelp->nrports = 16;
				brdp->bnk2panel[banknr] = panelp;
				brdp->bnkpageaddr[banknr] = nxtid;
				brdp->bnkstataddr[banknr++] = ioaddr + 4 +
					ECH_PNLSTATUS;
			} else {
				panelp->nrports = 8;
			}
		} else {
			panelp->uartp = (void *) &stl_cd1400uart;
			panelp->isr = stl_cd1400echintr;
			if (status & ECH_PNL16PORT) {
				panelp->nrports = 16;
				panelp->ackmask = 0x80;
				if (brdp->brdtype != BRD_ECHPCI)
					ioaddr += EREG_BANKSIZE;
				brdp->bnk2panel[banknr] = panelp;
				brdp->bnkpageaddr[banknr] = ++nxtid;
				brdp->bnkstataddr[banknr++] = ioaddr +
					ECH_PNLSTATUS;
			} else {
				panelp->nrports = 8;
				panelp->ackmask = 0xc0;
			}
		}

		nxtid++;
		ioaddr += EREG_BANKSIZE;
		brdp->nrports += panelp->nrports;
		brdp->panels[panelnr++] = panelp;
		if ((brdp->brdtype != BRD_ECHPCI) &&
		    (ioaddr >= (brdp->ioaddr2 + brdp->iosize2)))
			break;
	}

	brdp->nrpanels = panelnr;
	brdp->nrbnks = banknr;
	if (brdp->brdtype == BRD_ECH)
		outb((brdp->ioctrlval | ECH_BRDDISABLE), brdp->ioctrl);

	brdp->state |= BRD_FOUND;
	if (request_irq(brdp->irq, stl_intr, SA_SHIRQ, name, brdp) != 0) {
		printk("STALLION: failed to register interrupt "
		    "routine for %s irq=%d\n", name, brdp->irq);
		i = -ENODEV;
	} else {
		i = 0;
	}

	return(i);
}

/*****************************************************************************/

/*
 *	Initialize and configure the specified board.
 *	Scan through all the boards in the configuration and see what we
 *	can find. Handle EIO and the ECH boards a little differently here
 *	since the initial search and setup is very different.
 */

static int __init stl_brdinit(stlbrd_t *brdp)
{
	int	i;

#ifdef DEBUG
	printk("stl_brdinit(brdp=%x)\n", (int) brdp);
#endif

	switch (brdp->brdtype) {
	case BRD_EASYIO:
	case BRD_EASYIOPCI:
		stl_initeio(brdp);
		break;
	case BRD_ECH:
	case BRD_ECHMC:
	case BRD_ECHPCI:
	case BRD_ECH64PCI:
		stl_initech(brdp);
		break;
	default:
		printk("STALLION: board=%d is unknown board type=%d\n",
			brdp->brdnr, brdp->brdtype);
		return(ENODEV);
	}

	stl_brds[brdp->brdnr] = brdp;
	if ((brdp->state & BRD_FOUND) == 0) {
		printk("STALLION: %s board not found, board=%d io=%x irq=%d\n",
			stl_brdnames[brdp->brdtype], brdp->brdnr,
			brdp->ioaddr1, brdp->irq);
		return(ENODEV);
	}

	for (i = 0; (i < STL_MAXPANELS); i++)
		if (brdp->panels[i] != (stlpanel_t *) NULL)
			stl_initports(brdp, brdp->panels[i]);

	printk("STALLION: %s found, board=%d io=%x irq=%d "
		"nrpanels=%d nrports=%d\n", stl_brdnames[brdp->brdtype],
		brdp->brdnr, brdp->ioaddr1, brdp->irq, brdp->nrpanels,
		brdp->nrports);
	return(0);
}

/*****************************************************************************/

/*
 *	Find the next available board number that is free.
 */

static inline int stl_getbrdnr(void)
{
	int	i;

	for (i = 0; (i < STL_MAXBRDS); i++) {
		if (stl_brds[i] == (stlbrd_t *) NULL) {
			if (i >= stl_nrbrds)
				stl_nrbrds = i + 1;
			return(i);
		}
	}
	return(-1);
}

/*****************************************************************************/

#ifdef	CONFIG_PCI

/*
 *	We have a Stallion board. Allocate a board structure and
 *	initialize it. Read its IO and IRQ resources from PCI
 *	configuration space.
 */

static inline int stl_initpcibrd(int brdtype, struct pci_dev *devp)
{
	stlbrd_t	*brdp;

#ifdef DEBUG
	printk("stl_initpcibrd(brdtype=%d,busnr=%x,devnr=%x)\n", brdtype,
		devp->bus->number, devp->devfn);
#endif

	if (pci_enable_device(devp))
		return(-EIO);
	if ((brdp = stl_allocbrd()) == (stlbrd_t *) NULL)
		return(-ENOMEM);
	if ((brdp->brdnr = stl_getbrdnr()) < 0) {
		printk("STALLION: too many boards found, "
			"maximum supported %d\n", STL_MAXBRDS);
		return(0);
	}
	brdp->brdtype = brdtype;

/*
 *	Different Stallion boards use the BAR registers in different ways,
 *	so set up io addresses based on board type.
 */
#ifdef DEBUG
	printk("%s(%d): BAR[]=%x,%x,%x,%x IRQ=%x\n", __FILE__, __LINE__,
		pci_resource_start(devp, 0), pci_resource_start(devp, 1),
		pci_resource_start(devp, 2), pci_resource_start(devp, 3), devp->irq);
#endif

/*
 *	We have all resources from the board, so let's setup the actual
 *	board structure now.
 */
	switch (brdtype) {
	case BRD_ECHPCI:
		brdp->ioaddr2 = pci_resource_start(devp, 0);
		brdp->ioaddr1 = pci_resource_start(devp, 1);
		break;
	case BRD_ECH64PCI:
		brdp->ioaddr2 = pci_resource_start(devp, 2);
		brdp->ioaddr1 = pci_resource_start(devp, 1);
		break;
	case BRD_EASYIOPCI:
		brdp->ioaddr1 = pci_resource_start(devp, 2);
		brdp->ioaddr2 = pci_resource_start(devp, 1);
		break;
	default:
		printk("STALLION: unknown PCI board type=%d\n", brdtype);
		break;
	}

	brdp->irq = devp->irq;
	stl_brdinit(brdp);

	return(0);
}

/*****************************************************************************/

/*
 *	Find all Stallion PCI boards that might be installed. Initialize each
 *	one as it is found.
 */


static inline int stl_findpcibrds(void)
{
	struct pci_dev	*dev = NULL;
	int		i, rc;

#ifdef DEBUG
	printk("stl_findpcibrds()\n");
#endif

	for (i = 0; (i < stl_nrpcibrds); i++)
		while ((dev = pci_find_device(stl_pcibrds[i].vendid,
		    stl_pcibrds[i].devid, dev))) {

/*
 *			Found a device on the PCI bus that has our vendor and
 *			device ID. Need to check now that it is really us.
 */
			if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE)
				continue;

			rc = stl_initpcibrd(stl_pcibrds[i].brdtype, dev);
			if (rc)
				return(rc);
		}

	return(0);
}

#endif

/*****************************************************************************/

/*
 *	Scan through all the boards in the configuration and see what we
 *	can find. Handle EIO and the ECH boards a little differently here
 *	since the initial search and setup is too different.
 */

static inline int stl_initbrds(void)
{
	stlbrd_t	*brdp;
	stlconf_t	*confp;
	int		i;

#ifdef DEBUG
	printk("stl_initbrds()\n");
#endif

	if (stl_nrbrds > STL_MAXBRDS) {
		printk("STALLION: too many boards in configuration table, "
			"truncating to %d\n", STL_MAXBRDS);
		stl_nrbrds = STL_MAXBRDS;
	}

/*
 *	Firstly scan the list of static boards configured. Allocate
 *	resources and initialize the boards as found.
 */
	for (i = 0; (i < stl_nrbrds); i++) {
		confp = &stl_brdconf[i];
		stl_parsebrd(confp, stl_brdsp[i]);
		if ((brdp = stl_allocbrd()) == (stlbrd_t *) NULL)
			return(-ENOMEM);
		brdp->brdnr = i;
		brdp->brdtype = confp->brdtype;
		brdp->ioaddr1 = confp->ioaddr1;
		brdp->ioaddr2 = confp->ioaddr2;
		brdp->irq = confp->irq;
		brdp->irqtype = confp->irqtype;
		stl_brdinit(brdp);
	}

/*
 *	Find any dynamically supported boards. That is via module load
 *	line options or auto-detected on the PCI bus.
 */
	stl_argbrds();
#ifdef CONFIG_PCI
	stl_findpcibrds();
#endif

	return(0);
}

/*****************************************************************************/

/*
 *	Return the board stats structure to user app.
 */

static int stl_getbrdstats(combrd_t __user *bp)
{
	stlbrd_t	*brdp;
	stlpanel_t	*panelp;
	int		i;

	if (copy_from_user(&stl_brdstats, bp, sizeof(combrd_t)))
		return -EFAULT;
	if (stl_brdstats.brd >= STL_MAXBRDS)
		return(-ENODEV);
	brdp = stl_brds[stl_brdstats.brd];
	if (brdp == (stlbrd_t *) NULL)
		return(-ENODEV);

	memset(&stl_brdstats, 0, sizeof(combrd_t));
	stl_brdstats.brd = brdp->brdnr;
	stl_brdstats.type = brdp->brdtype;
	stl_brdstats.hwid = brdp->hwid;
	stl_brdstats.state = brdp->state;
	stl_brdstats.ioaddr = brdp->ioaddr1;
	stl_brdstats.ioaddr2 = brdp->ioaddr2;
	stl_brdstats.irq = brdp->irq;
	stl_brdstats.nrpanels = brdp->nrpanels;
	stl_brdstats.nrports = brdp->nrports;
	for (i = 0; (i < brdp->nrpanels); i++) {
		panelp = brdp->panels[i];
		stl_brdstats.panels[i].panel = i;
		stl_brdstats.panels[i].hwid = panelp->hwid;
		stl_brdstats.panels[i].nrports = panelp->nrports;
	}

	return copy_to_user(bp, &stl_brdstats, sizeof(combrd_t)) ? -EFAULT : 0;
}

/*****************************************************************************/

/*
 *	Resolve the referenced port number into a port struct pointer.
 */

static stlport_t *stl_getport(int brdnr, int panelnr, int portnr)
{
	stlbrd_t	*brdp;
	stlpanel_t	*panelp;

	if ((brdnr < 0) || (brdnr >= STL_MAXBRDS))
		return((stlport_t *) NULL);
	brdp = stl_brds[brdnr];
	if (brdp == (stlbrd_t *) NULL)
		return((stlport_t *) NULL);
	if ((panelnr < 0) || (panelnr >= brdp->nrpanels))
		return((stlport_t *) NULL);
	panelp = brdp->panels[panelnr];
	if (panelp == (stlpanel_t *) NULL)
		return((stlport_t *) NULL);
	if ((portnr < 0) || (portnr >= panelp->nrports))
		return((stlport_t *) NULL);
	return(panelp->ports[portnr]);
}

/*****************************************************************************/

/*
 *	Return the port stats structure to user app. A NULL port struct
 *	pointer passed in means that we need to find out from the app
 *	what port to get stats for (used through board control device).
 */

static int stl_getportstats(stlport_t *portp, comstats_t __user *cp)
{
	unsigned char	*head, *tail;
	unsigned long	flags;

	if (!portp) {
		if (copy_from_user(&stl_comstats, cp, sizeof(comstats_t)))
			return -EFAULT;
		portp = stl_getport(stl_comstats.brd, stl_comstats.panel,
			stl_comstats.port);
		if (portp == (stlport_t *) NULL)
			return(-ENODEV);
	}

	portp->stats.state = portp->istate;
	portp->stats.flags = portp->flags;
	portp->stats.hwid = portp->hwid;

	portp->stats.ttystate = 0;
	portp->stats.cflags = 0;
	portp->stats.iflags = 0;
	portp->stats.oflags = 0;
	portp->stats.lflags = 0;
	portp->stats.rxbuffered = 0;

	save_flags(flags);
	cli();
	if (portp->tty != (struct tty_struct *) NULL) {
		if (portp->tty->driver_data == portp) {
			portp->stats.ttystate = portp->tty->flags;
			/* No longer available as a statistic */
			portp->stats.rxbuffered = 1; /*portp->tty->flip.count; */
			if (portp->tty->termios != (struct termios *) NULL) {
				portp->stats.cflags = portp->tty->termios->c_cflag;
				portp->stats.iflags = portp->tty->termios->c_iflag;
				portp->stats.oflags = portp->tty->termios->c_oflag;
				portp->stats.lflags = portp->tty->termios->c_lflag;
			}
		}
	}
	restore_flags(flags);

	head = portp->tx.head;
	tail = portp->tx.tail;
	portp->stats.txbuffered = ((head >= tail) ? (head - tail) :
		(STL_TXBUFSIZE - (tail - head)));

	portp->stats.signals = (unsigned long) stl_getsignals(portp);

	return copy_to_user(cp, &portp->stats,
			    sizeof(comstats_t)) ? -EFAULT : 0;
}

/*****************************************************************************/

/*
 *	Clear the port stats structure. We also return it zeroed out...
 */

static int stl_clrportstats(stlport_t *portp, comstats_t __user *cp)
{
	if (!portp) {
		if (copy_from_user(&stl_comstats, cp, sizeof(comstats_t)))
			return -EFAULT;
		portp = stl_getport(stl_comstats.brd, stl_comstats.panel,
			stl_comstats.port);
		if (portp == (stlport_t *) NULL)
			return(-ENODEV);
	}

	memset(&portp->stats, 0, sizeof(comstats_t));
	portp->stats.brd = portp->brdnr;
	portp->stats.panel = portp->panelnr;
	portp->stats.port = portp->portnr;
	return copy_to_user(cp, &portp->stats,
			    sizeof(comstats_t)) ? -EFAULT : 0;
}

/*****************************************************************************/

/*
 *	Return the entire driver ports structure to a user app.
 */

static int stl_getportstruct(stlport_t __user *arg)
{
	stlport_t	*portp;

	if (copy_from_user(&stl_dummyport, arg, sizeof(stlport_t)))
		return -EFAULT;
	portp = stl_getport(stl_dummyport.brdnr, stl_dummyport.panelnr,
		 stl_dummyport.portnr);
	if (!portp)
		return -ENODEV;
	return copy_to_user(arg, portp, sizeof(stlport_t)) ? -EFAULT : 0;
}

/*****************************************************************************/

/*
 *	Return the entire driver board structure to a user app.
 */

static int stl_getbrdstruct(stlbrd_t __user *arg)
{
	stlbrd_t	*brdp;

	if (copy_from_user(&stl_dummybrd, arg, sizeof(stlbrd_t)))
		return -EFAULT;
	if ((stl_dummybrd.brdnr < 0) || (stl_dummybrd.brdnr >= STL_MAXBRDS))
		return -ENODEV;
	brdp = stl_brds[stl_dummybrd.brdnr];
	if (!brdp)
		return(-ENODEV);
	return copy_to_user(arg, brdp, sizeof(stlbrd_t)) ? -EFAULT : 0;
}

/*****************************************************************************/

/*
 *	The "staliomem" device is also required to do some special operations
 *	on the board and/or ports. In this driver it is mostly used for stats
 *	collection.
 */

static int stl_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, unsigned long arg)
{
	int	brdnr, rc;
	void __user *argp = (void __user *)arg;

#ifdef DEBUG
	printk("stl_memioctl(ip=%x,fp=%x,cmd=%x,arg=%x)\n", (int) ip,
		(int) fp, cmd, (int) arg);
#endif

	brdnr = iminor(ip);
	if (brdnr >= STL_MAXBRDS)
		return(-ENODEV);
	rc = 0;

	switch (cmd) {
	case COM_GETPORTSTATS:
		rc = stl_getportstats(NULL, argp);
		break;
	case COM_CLRPORTSTATS:
		rc = stl_clrportstats(NULL, argp);
		break;
	case COM_GETBRDSTATS:
		rc = stl_getbrdstats(argp);
		break;
	case COM_READPORT:
		rc = stl_getportstruct(argp);
		break;
	case COM_READBOARD:
		rc = stl_getbrdstruct(argp);
		break;
	default:
		rc = -ENOIOCTLCMD;
		break;
	}

	return(rc);
}

static struct tty_operations stl_ops = {
	.open = stl_open,
	.close = stl_close,
	.write = stl_write,
	.put_char = stl_putchar,
	.flush_chars = stl_flushchars,
	.write_room = stl_writeroom,
	.chars_in_buffer = stl_charsinbuffer,
	.ioctl = stl_ioctl,
	.set_termios = stl_settermios,
	.throttle = stl_throttle,
	.unthrottle = stl_unthrottle,
	.stop = stl_stop,
	.start = stl_start,
	.hangup = stl_hangup,
	.flush_buffer = stl_flushbuffer,
	.break_ctl = stl_breakctl,
	.wait_until_sent = stl_waituntilsent,
	.send_xchar = stl_sendxchar,
	.read_proc = stl_readproc,
	.tiocmget = stl_tiocmget,
	.tiocmset = stl_tiocmset,
};

/*****************************************************************************/

static int __init stl_init(void)
{
	int i;
	printk(KERN_INFO "%s: version %s\n", stl_drvtitle, stl_drvversion);

	stl_initbrds();

	stl_serial = alloc_tty_driver(STL_MAXBRDS * STL_MAXPORTS);
	if (!stl_serial)
		return -1;

/*
 *	Allocate a temporary write buffer.
 */
	stl_tmpwritebuf = kmalloc(STL_TXBUFSIZE, GFP_KERNEL);
	if (!stl_tmpwritebuf)
		printk("STALLION: failed to allocate memory (size=%d)\n",
			STL_TXBUFSIZE);

/*
 *	Set up a character driver for per board stuff. This is mainly used
 *	to do stats ioctls on the ports.
 */
	if (register_chrdev(STL_SIOMEMMAJOR, "staliomem", &stl_fsiomem))
		printk("STALLION: failed to register serial board device\n");

	stallion_class = class_create(THIS_MODULE, "staliomem");
	for (i = 0; i < 4; i++)
		class_device_create(stallion_class, NULL,
				    MKDEV(STL_SIOMEMMAJOR, i), NULL,
				    "staliomem%d", i);

	stl_serial->owner = THIS_MODULE;
	stl_serial->driver_name = stl_drvname;
	stl_serial->name = "ttyE";
	stl_serial->devfs_name = "tts/E";
	stl_serial->major = STL_SERIALMAJOR;
	stl_serial->minor_start = 0;
	stl_serial->type = TTY_DRIVER_TYPE_SERIAL;
	stl_serial->subtype = SERIAL_TYPE_NORMAL;
	stl_serial->init_termios = stl_deftermios;
	stl_serial->flags = TTY_DRIVER_REAL_RAW;
	tty_set_operations(stl_serial, &stl_ops);

	if (tty_register_driver(stl_serial)) {
		put_tty_driver(stl_serial);
		printk("STALLION: failed to register serial driver\n");
		return -1;
	}

	return 0;
}

/*****************************************************************************/
/*                       CD1400 HARDWARE FUNCTIONS                           */
/*****************************************************************************/

/*
 *	These functions get/set/update the registers of the cd1400 UARTs.
 *	Access to the cd1400 registers is via an address/data io port pair.
 *	(Maybe should make this inline...)
 */

static int stl_cd1400getreg(stlport_t *portp, int regnr)
{
	outb((regnr + portp->uartaddr), portp->ioaddr);
	return inb(portp->ioaddr + EREG_DATA);
}

static void stl_cd1400setreg(stlport_t *portp, int regnr, int value)
{
	outb((regnr + portp->uartaddr), portp->ioaddr);
	outb(value, portp->ioaddr + EREG_DATA);
}

static int stl_cd1400updatereg(stlport_t *portp, int regnr, int value)
{
	outb((regnr + portp->uartaddr), portp->ioaddr);
	if (inb(portp->ioaddr + EREG_DATA) != value) {
		outb(value, portp->ioaddr + EREG_DATA);
		return 1;
	}
	return 0;
}

/*****************************************************************************/

/*
 *	Inbitialize the UARTs in a panel. We don't care what sort of board
 *	these ports are on - since the port io registers are almost
 *	identical when dealing with ports.
 */

static int stl_cd1400panelinit(stlbrd_t *brdp, stlpanel_t *panelp)
{
	unsigned int	gfrcr;
	int		chipmask, i, j;
	int		nrchips, uartaddr, ioaddr;

#ifdef DEBUG
	printk("stl_panelinit(brdp=%x,panelp=%x)\n", (int) brdp, (int) panelp);
#endif

	BRDENABLE(panelp->brdnr, panelp->pagenr);

/*
 *	Check that each chip is present and started up OK.
 */
	chipmask = 0;
	nrchips = panelp->nrports / CD1400_PORTS;
	for (i = 0; (i < nrchips); i++) {
		if (brdp->brdtype == BRD_ECHPCI) {
			outb((panelp->pagenr + (i >> 1)), brdp->ioctrl);
			ioaddr = panelp->iobase;
		} else {
			ioaddr = panelp->iobase + (EREG_BANKSIZE * (i >> 1));
		}
		uartaddr = (i & 0x01) ? 0x080 : 0;
		outb((GFRCR + uartaddr), ioaddr);
		outb(0, (ioaddr + EREG_DATA));
		outb((CCR + uartaddr), ioaddr);
		outb(CCR_RESETFULL, (ioaddr + EREG_DATA));
		outb(CCR_RESETFULL, (ioaddr + EREG_DATA));
		outb((GFRCR + uartaddr), ioaddr);
		for (j = 0; (j < CCR_MAXWAIT); j++) {
			if ((gfrcr = inb(ioaddr + EREG_DATA)) != 0)
				break;
		}
		if ((j >= CCR_MAXWAIT) || (gfrcr < 0x40) || (gfrcr > 0x60)) {
			printk("STALLION: cd1400 not responding, "
				"brd=%d panel=%d chip=%d\n",
				panelp->brdnr, panelp->panelnr, i);
			continue;
		}
		chipmask |= (0x1 << i);
		outb((PPR + uartaddr), ioaddr);
		outb(PPR_SCALAR, (ioaddr + EREG_DATA));
	}

	BRDDISABLE(panelp->brdnr);
	return chipmask;
}

/*****************************************************************************/

/*
 *	Initialize hardware specific port registers.
 */

static void stl_cd1400portinit(stlbrd_t *brdp, stlpanel_t *panelp, stlport_t *portp)
{
#ifdef DEBUG
	printk("stl_cd1400portinit(brdp=%x,panelp=%x,portp=%x)\n",
		(int) brdp, (int) panelp, (int) portp);
#endif

	if ((brdp == (stlbrd_t *) NULL) || (panelp == (stlpanel_t *) NULL) ||
	    (portp == (stlport_t *) NULL))
		return;

	portp->ioaddr = panelp->iobase + (((brdp->brdtype == BRD_ECHPCI) ||
		(portp->portnr < 8)) ? 0 : EREG_BANKSIZE);
	portp->uartaddr = (portp->portnr & 0x04) << 5;
	portp->pagenr = panelp->pagenr + (portp->portnr >> 3);

	BRDENABLE(portp->brdnr, portp->pagenr);
	stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
	stl_cd1400setreg(portp, LIVR, (portp->portnr << 3));
	portp->hwid = stl_cd1400getreg(portp, GFRCR);
	BRDDISABLE(portp->brdnr);
}

/*****************************************************************************/

/*
 *	Wait for the command register to be ready. We will poll this,
 *	since it won't usually take too long to be ready.
 */

static void stl_cd1400ccrwait(stlport_t *portp)
{
	int	i;

	for (i = 0; (i < CCR_MAXWAIT); i++) {
		if (stl_cd1400getreg(portp, CCR) == 0) {
			return;
		}
	}

	printk("STALLION: cd1400 not responding, port=%d panel=%d brd=%d\n",
		portp->portnr, portp->panelnr, portp->brdnr);
}

/*****************************************************************************/

/*
 *	Set up the cd1400 registers for a port based on the termios port
 *	settings.
 */

static void stl_cd1400setport(stlport_t *portp, struct termios *tiosp)
{
	stlbrd_t	*brdp;
	unsigned long	flags;
	unsigned int	clkdiv, baudrate;
	unsigned char	cor1, cor2, cor3;
	unsigned char	cor4, cor5, ccr;
	unsigned char	srer, sreron, sreroff;
	unsigned char	mcor1, mcor2, rtpr;
	unsigned char	clk, div;

	cor1 = 0;
	cor2 = 0;
	cor3 = 0;
	cor4 = 0;
	cor5 = 0;
	ccr = 0;
	rtpr = 0;
	clk = 0;
	div = 0;
	mcor1 = 0;
	mcor2 = 0;
	sreron = 0;
	sreroff = 0;

	brdp = stl_brds[portp->brdnr];
	if (brdp == (stlbrd_t *) NULL)
		return;

/*
 *	Set up the RX char ignore mask with those RX error types we
 *	can ignore. We can get the cd1400 to help us out a little here,
 *	it will ignore parity errors and breaks for us.
 */
	portp->rxignoremsk = 0;
	if (tiosp->c_iflag & IGNPAR) {
		portp->rxignoremsk |= (ST_PARITY | ST_FRAMING | ST_OVERRUN);
		cor1 |= COR1_PARIGNORE;
	}
	if (tiosp->c_iflag & IGNBRK) {
		portp->rxignoremsk |= ST_BREAK;
		cor4 |= COR4_IGNBRK;
	}

	portp->rxmarkmsk = ST_OVERRUN;
	if (tiosp->c_iflag & (INPCK | PARMRK))
		portp->rxmarkmsk |= (ST_PARITY | ST_FRAMING);
	if (tiosp->c_iflag & BRKINT)
		portp->rxmarkmsk |= ST_BREAK;

/*
 *	Go through the char size, parity and stop bits and set all the
 *	option register appropriately.
 */
	switch (tiosp->c_cflag & CSIZE) {
	case CS5:
		cor1 |= COR1_CHL5;
		break;
	case CS6:
		cor1 |= COR1_CHL6;
		break;
	case CS7:
		cor1 |= COR1_CHL7;
		break;
	default:
		cor1 |= COR1_CHL8;
		break;
	}

	if (tiosp->c_cflag & CSTOPB)
		cor1 |= COR1_STOP2;
	else
		cor1 |= COR1_STOP1;

	if (tiosp->c_cflag & PARENB) {
		if (tiosp->c_cflag & PARODD)
			cor1 |= (COR1_PARENB | COR1_PARODD);
		else
			cor1 |= (COR1_PARENB | COR1_PAREVEN);
	} else {
		cor1 |= COR1_PARNONE;
	}

/*
 *	Set the RX FIFO threshold at 6 chars. This gives a bit of breathing
 *	space for hardware flow control and the like. This should be set to
 *	VMIN. Also here we will set the RX data timeout to 10ms - this should
 *	really be based on VTIME.
 */
	cor3 |= FIFO_RXTHRESHOLD;
	rtpr = 2;

/*
 *	Calculate the baud rate timers. For now we will just assume that
 *	the input and output baud are the same. Could have used a baud
 *	table here, but this way we can generate virtually any baud rate
 *	we like!
 */
	baudrate = tiosp->c_cflag & CBAUD;
	if (baudrate & CBAUDEX) {
		baudrate &= ~CBAUDEX;
		if ((baudrate < 1) || (baudrate > 4))
			tiosp->c_cflag &= ~CBAUDEX;
		else
			baudrate += 15;
	}
	baudrate = stl_baudrates[baudrate];
	if ((tiosp->c_cflag & CBAUD) == B38400) {
		if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
			baudrate = 57600;
		else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
			baudrate = 115200;
		else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
			baudrate = 230400;
		else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
			baudrate = 460800;
		else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
			baudrate = (portp->baud_base / portp->custom_divisor);
	}
	if (baudrate > STL_CD1400MAXBAUD)
		baudrate = STL_CD1400MAXBAUD;

	if (baudrate > 0) {
		for (clk = 0; (clk < CD1400_NUMCLKS); clk++) {
			clkdiv = ((portp->clk / stl_cd1400clkdivs[clk]) / baudrate);
			if (clkdiv < 0x100)
				break;
		}
		div = (unsigned char) clkdiv;
	}

/*
 *	Check what form of modem signaling is required and set it up.
 */
	if ((tiosp->c_cflag & CLOCAL) == 0) {
		mcor1 |= MCOR1_DCD;
		mcor2 |= MCOR2_DCD;
		sreron |= SRER_MODEM;
		portp->flags |= ASYNC_CHECK_CD;
	} else {
		portp->flags &= ~ASYNC_CHECK_CD;
	}

/*
 *	Setup cd1400 enhanced modes if we can. In particular we want to
 *	handle as much of the flow control as possible automatically. As
 *	well as saving a few CPU cycles it will also greatly improve flow
 *	control reliability.
 */
	if (tiosp->c_iflag & IXON) {
		cor2 |= COR2_TXIBE;
		cor3 |= COR3_SCD12;
		if (tiosp->c_iflag & IXANY)
			cor2 |= COR2_IXM;
	}

	if (tiosp->c_cflag & CRTSCTS) {
		cor2 |= COR2_CTSAE;
		mcor1 |= FIFO_RTSTHRESHOLD;
	}

/*
 *	All cd1400 register values calculated so go through and set
 *	them all up.
 */

#ifdef DEBUG
	printk("SETPORT: portnr=%d panelnr=%d brdnr=%d\n",
		portp->portnr, portp->panelnr, portp->brdnr);
	printk("    cor1=%x cor2=%x cor3=%x cor4=%x cor5=%x\n",
		cor1, cor2, cor3, cor4, cor5);
	printk("    mcor1=%x mcor2=%x rtpr=%x sreron=%x sreroff=%x\n",
		mcor1, mcor2, rtpr, sreron, sreroff);
	printk("    tcor=%x tbpr=%x rcor=%x rbpr=%x\n", clk, div, clk, div);
	printk("    schr1=%x schr2=%x schr3=%x schr4=%x\n",
		tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP],
		tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP]);
#endif

	save_flags(flags);
	cli();
	BRDENABLE(portp->brdnr, portp->pagenr);
	stl_cd1400setreg(portp, CAR, (portp->portnr & 0x3));
	srer = stl_cd1400getreg(portp, SRER);
	stl_cd1400setreg(portp, SRER, 0);
	if (stl_cd1400updatereg(portp, COR1, cor1))
		ccr = 1;
	if (stl_cd1400updatereg(portp, COR2, cor2))
		ccr = 1;
	if (stl_cd1400updatereg(portp, COR3, cor3))
		ccr = 1;
	if (ccr) {
		stl_cd1400ccrwait(portp);
		stl_cd1400setreg(portp, CCR, CCR_CORCHANGE);
	}
	stl_cd1400setreg(portp, COR4, cor4);
	stl_cd1400setreg(portp, COR5, cor5);
	stl_cd1400setreg(portp, MCOR1, mcor1);
	stl_cd1400setreg(portp, MCOR2, mcor2);
	if (baudrate > 0) {
		stl_cd1400setreg(portp, TCOR, clk);
		stl_cd1400setreg(portp, TBPR, div);
		stl_cd1400setreg(portp, RCOR, clk);
		stl_cd1400setreg(portp, RBPR, div);
	}
	stl_cd1400setreg(portp, SCHR1, tiosp->c_cc[VSTART]);
	stl_cd1400setreg(portp, SCHR2, tiosp->c_cc[VSTOP]);
	stl_cd1400setreg(portp, SCHR3, tiosp->c_cc[VSTART]);
	stl_cd1400setreg(portp, SCHR4, tiosp->c_cc[VSTOP]);
	stl_cd1400setreg(portp, RTPR, rtpr);
	mcor1 = stl_cd1400getreg(portp, MSVR1);
	if (mcor1 & MSVR1_DCD)
		portp->sigs |= TIOCM_CD;
	else
		portp->sigs &= ~TIOCM_CD;
	stl_cd1400setreg(portp, SRER, ((srer & ~sreroff) | sreron));
	BRDDISABLE(portp->brdnr);
	restore_flags(flags);
}

/*****************************************************************************/

/*
 *	Set the state of the DTR and RTS signals.
 */

static void stl_cd1400setsignals(stlport_t *portp, int dtr, int rts)
{
	unsigned char	msvr1, msvr2;
	unsigned long	flags;

#ifdef DEBUG
	printk("stl_cd1400setsignals(portp=%x,dtr=%d,rts=%d)\n",
		(int) portp, dtr, rts);
#endif

	msvr1 = 0;
	msvr2 = 0;
	if (dtr > 0)
		msvr1 = MSVR1_DTR;
	if (rts > 0)
		msvr2 = MSVR2_RTS;

	save_flags(flags);
	cli();
	BRDENABLE(portp->brdnr, portp->pagenr);
	stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
	if (rts >= 0)
		stl_cd1400setreg(portp, MSVR2, msvr2);
	if (dtr >= 0)
		stl_cd1400setreg(portp, MSVR1, msvr1);
	BRDDISABLE(portp->brdnr);
	restore_flags(flags);
}

/*****************************************************************************/

/*
 *	Return the state of the signals.
 */

static int stl_cd1400getsignals(stlport_t *portp)
{
	unsigned char	msvr1, msvr2;
	unsigned long	flags;
	int		sigs;

#ifdef DEBUG
	printk("stl_cd1400getsignals(portp=%x)\n", (int) portp);
#endif

	save_flags(flags);
	cli();
	BRDENABLE(portp->brdnr, portp->pagenr);
	stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
	msvr1 = stl_cd1400getreg(portp, MSVR1);
	msvr2 = stl_cd1400getreg(portp, MSVR2);
	BRDDISABLE(portp->brdnr);
	restore_flags(flags);

	sigs = 0;
	sigs |= (msvr1 & MSVR1_DCD) ? TIOCM_CD : 0;
	sigs |= (msvr1 & MSVR1_CTS) ? TIOCM_CTS : 0;
	sigs |= (msvr1 & MSVR1_DTR) ? TIOCM_DTR : 0;
	sigs |= (msvr2 & MSVR2_RTS) ? TIOCM_RTS : 0;
#if 0
	sigs |= (msvr1 & MSVR1_RI) ? TIOCM_RI : 0;
	sigs |= (msvr1 & MSVR1_DSR) ? TIOCM_DSR : 0;
#else
	sigs |= TIOCM_DSR;
#endif
	return sigs;
}

/*****************************************************************************/

/*
 *	Enable/Disable the Transmitter and/or Receiver.
 */

static void stl_cd1400enablerxtx(stlport_t *portp, int rx, int tx)
{
	unsigned char	ccr;
	unsigned long	flags;

#ifdef DEBUG
	printk("stl_cd1400enablerxtx(portp=%x,rx=%d,tx=%d)\n",
		(int) portp, rx, tx);
#endif
	ccr = 0;

	if (tx == 0)
		ccr |= CCR_TXDISABLE;
	else if (tx > 0)
		ccr |= CCR_TXENABLE;
	if (rx == 0)
		ccr |= CCR_RXDISABLE;
	else if (rx > 0)
		ccr |= CCR_RXENABLE;

	save_flags(flags);
	cli();
	BRDENABLE(portp->brdnr, portp->pagenr);
	stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
	stl_cd1400ccrwait(portp);
	stl_cd1400setreg(portp, CCR, ccr);
	stl_cd1400ccrwait(portp);
	BRDDISABLE(portp->brdnr);
	restore_flags(flags);
}

/*****************************************************************************/

/*
 *	Start/stop the Transmitter and/or Receiver.
 */

static void stl_cd1400startrxtx(stlport_t *portp, int rx, int tx)
{
	unsigned char	sreron, sreroff;
	unsigned long	flags;

#ifdef DEBUG
	printk("stl_cd1400startrxtx(portp=%x,rx=%d,tx=%d)\n",
		(int) portp, rx, tx);
#endif

	sreron = 0;
	sreroff = 0;
	if (tx == 0)
		sreroff |= (SRER_TXDATA | SRER_TXEMPTY);
	else if (tx == 1)
		sreron |= SRER_TXDATA;
	else if (tx >= 2)
		sreron |= SRER_TXEMPTY;
	if (rx == 0)
		sreroff |= SRER_RXDATA;
	else if (rx > 0)
		sreron |= SRER_RXDATA;

	save_flags(flags);
	cli();
	BRDENABLE(portp->brdnr, portp->pagenr);
	stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
	stl_cd1400setreg(portp, SRER,
		((stl_cd1400getreg(portp, SRER) & ~sreroff) | sreron));
	BRDDISABLE(portp->brdnr);
	if (tx > 0)
		set_bit(ASYI_TXBUSY, &portp->istate);
	restore_flags(flags);
}

/*****************************************************************************/

/*
 *	Disable all interrupts from this port.
 */

static void stl_cd1400disableintrs(stlport_t *portp)
{
	unsigned long	flags;

#ifdef DEBUG
	printk("stl_cd1400disableintrs(portp=%x)\n", (int) portp);
#endif
	save_flags(flags);
	cli();
	BRDENABLE(portp->brdnr, portp->pagenr);
	stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
	stl_cd1400setreg(portp, SRER, 0);
	BRDDISABLE(portp->brdnr);
	restore_flags(flags);
}

/*****************************************************************************/

static void stl_cd1400sendbreak(stlport_t *portp, int len)
{
	unsigned long	flags;

#ifdef DEBUG
	printk("stl_cd1400sendbreak(portp=%x,len=%d)\n", (int) portp, len);
#endif

	save_flags(flags);
	cli();
	BRDENABLE(portp->brdnr, portp->pagenr);
	stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
	stl_cd1400setreg(portp, SRER,
		((stl_cd1400getreg(portp, SRER) & ~SRER_TXDATA) |
		SRER_TXEMPTY));
	BRDDISABLE(portp->brdnr);
	portp->brklen = len;
	if (len == 1)
		portp->stats.txbreaks++;
	restore_flags(flags);
}

/*****************************************************************************/

/*
 *	Take flow control actions...
 */

static void stl_cd1400flowctrl(stlport_t *portp, int state)
{
	struct tty_struct	*tty;
	unsigned long		flags;

#ifdef DEBUG
	printk("stl_cd1400flowctrl(portp=%x,state=%x)\n", (int) portp, state);
#endif

	if (portp == (stlport_t *) NULL)
		return;
	tty = portp->tty;
	if (tty == (struct tty_struct *) NULL)
		return;

	save_flags(flags);
	cli();
	BRDENABLE(portp->brdnr, portp->pagenr);
	stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));

	if (state) {
		if (tty->termios->c_iflag & IXOFF) {
			stl_cd1400ccrwait(portp);
			stl_cd1400setreg(portp, CCR, CCR_SENDSCHR1);
			portp->stats.rxxon++;
			stl_cd1400ccrwait(portp);
		}
/*
 *		Question: should we return RTS to what it was before? It may
 *		have been set by an ioctl... Suppose not, since if you have
 *		hardware flow control set then it is pretty silly to go and
 *		set the RTS line by hand.
 */
		if (tty->termios->c_cflag & CRTSCTS) {
			stl_cd1400setreg(portp, MCOR1,
				(stl_cd1400getreg(portp, MCOR1) |
				FIFO_RTSTHRESHOLD));
			stl_cd1400setreg(portp, MSVR2, MSVR2_RTS);
			portp->stats.rxrtson++;
		}
	} else {
		if (tty->termios->c_iflag & IXOFF) {
			stl_cd1400ccrwait(portp);
			stl_cd1400setreg(portp, CCR, CCR_SENDSCHR2);
			portp->stats.rxxoff++;
			stl_cd1400ccrwait(portp);
		}
		if (tty->termios->c_cflag & CRTSCTS) {
			stl_cd1400setreg(portp, MCOR1,
				(stl_cd1400getreg(portp, MCOR1) & 0xf0));
			stl_cd1400setreg(portp, MSVR2, 0);
			portp->stats.rxrtsoff++;
		}
	}

	BRDDISABLE(portp->brdnr);
	restore_flags(flags);
}

/*****************************************************************************/

/*
 *	Send a flow control character...
 */

static void stl_cd1400sendflow(stlport_t *portp, int state)
{
	struct tty_struct	*tty;
	unsigned long		flags;

#ifdef DEBUG
	printk("stl_cd1400sendflow(portp=%x,state=%x)\n", (int) portp, state);
#endif

	if (portp == (stlport_t *) NULL)
		return;
	tty = portp->tty;
	if (tty == (struct tty_struct *) NULL)
		return;

	save_flags(flags);
	cli();
	BRDENABLE(portp->brdnr, portp->pagenr);
	stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
	if (state) {
		stl_cd1400ccrwait(portp);
		stl_cd1400setreg(portp, CCR, CCR_SENDSCHR1);
		portp->stats.rxxon++;
		stl_cd1400ccrwait(portp);
	} else {
		stl_cd1400ccrwait(portp);
		stl_cd1400setreg(portp, CCR, CCR_SENDSCHR2);
		portp->stats.rxxoff++;
		stl_cd1400ccrwait(portp);
	}
	BRDDISABLE(portp->brdnr);
	restore_flags(flags);
}

/*****************************************************************************/

static void stl_cd1400flush(stlport_t *portp)
{
	unsigned long	flags;

#ifdef DEBUG
	printk("stl_cd1400flush(portp=%x)\n", (int) portp);
#endif

	if (portp == (stlport_t *) NULL)
		return;

	save_flags(flags);
	cli();
	BRDENABLE(portp->brdnr, portp->pagenr);
	stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
	stl_cd1400ccrwait(portp);
	stl_cd1400setreg(portp, CCR, CCR_TXFLUSHFIFO);
	stl_cd1400ccrwait(portp);
	portp->tx.tail = portp->tx.head;
	BRDDISABLE(portp->brdnr);
	restore_flags(flags);
}

/*****************************************************************************/

/*
 *	Return the current state of data flow on this port. This is only
 *	really interresting when determining if data has fully completed
 *	transmission or not... This is easy for the cd1400, it accurately
 *	maintains the busy port flag.
 */

static int stl_cd1400datastate(stlport_t *portp)
{
#ifdef DEBUG
	printk("stl_cd1400datastate(portp=%x)\n", (int) portp);
#endif

	if (portp == (stlport_t *) NULL)
		return 0;

	return test_bit(ASYI_TXBUSY, &portp->istate) ? 1 : 0;
}

/*****************************************************************************/

/*
 *	Interrupt service routine for cd1400 EasyIO boards.
 */

static void stl_cd1400eiointr(stlpanel_t *panelp, unsigned int iobase)
{
	unsigned char	svrtype;

#ifdef DEBUG
	printk("stl_cd1400eiointr(panelp=%x,iobase=%x)\n",
		(int) panelp, iobase);
#endif

	outb(SVRR, iobase);
	svrtype = inb(iobase + EREG_DATA);
	if (panelp->nrports > 4) {
		outb((SVRR + 0x80), iobase);
		svrtype |= inb(iobase + EREG_DATA);
	}

	if (svrtype & SVRR_RX)
		stl_cd1400rxisr(panelp, iobase);
	else if (svrtype & SVRR_TX)
		stl_cd1400txisr(panelp, iobase);
	else if (svrtype & SVRR_MDM)
		stl_cd1400mdmisr(panelp, iobase);
}

/*****************************************************************************/

/*
 *	Interrupt service routine for cd1400 panels.
 */

static void stl_cd1400echintr(stlpanel_t *panelp, unsigned int iobase)
{
	unsigned char	svrtype;

#ifdef DEBUG
	printk("stl_cd1400echintr(panelp=%x,iobase=%x)\n", (int) panelp,
		iobase);
#endif

	outb(SVRR, iobase);
	svrtype = inb(iobase + EREG_DATA);
	outb((SVRR + 0x80), iobase);
	svrtype |= inb(iobase + EREG_DATA);
	if (svrtype & SVRR_RX)
		stl_cd1400rxisr(panelp, iobase);
	else if (svrtype & SVRR_TX)
		stl_cd1400txisr(panelp, iobase);
	else if (svrtype & SVRR_MDM)
		stl_cd1400mdmisr(panelp, iobase);
}


/*****************************************************************************/

/*
 *	Unfortunately we need to handle breaks in the TX data stream, since
 *	this is the only way to generate them on the cd1400.
 */

static inline int stl_cd1400breakisr(stlport_t *portp, int ioaddr)
{
	if (portp->brklen == 1) {
		outb((COR2 + portp->uartaddr), ioaddr);
		outb((inb(ioaddr + EREG_DATA) | COR2_ETC),
			(ioaddr + EREG_DATA));
		outb((TDR + portp->uartaddr), ioaddr);
		outb(ETC_CMD, (ioaddr + EREG_DATA));
		outb(ETC_STARTBREAK, (ioaddr + EREG_DATA));
		outb((SRER + portp->uartaddr), ioaddr);
		outb((inb(ioaddr + EREG_DATA) & ~(SRER_TXDATA | SRER_TXEMPTY)),
			(ioaddr + EREG_DATA));
		return 1;
	} else if (portp->brklen > 1) {
		outb((TDR + portp->uartaddr), ioaddr);
		outb(ETC_CMD, (ioaddr + EREG_DATA));
		outb(ETC_STOPBREAK, (ioaddr + EREG_DATA));
		portp->brklen = -1;
		return 1;
	} else {
		outb((COR2 + portp->uartaddr), ioaddr);
		outb((inb(ioaddr + EREG_DATA) & ~COR2_ETC),
			(ioaddr + EREG_DATA));
		portp->brklen = 0;
	}
	return 0;
}

/*****************************************************************************/

/*
 *	Transmit interrupt handler. This has gotta be fast!  Handling TX
 *	chars is pretty simple, stuff as many as possible from the TX buffer
 *	into the cd1400 FIFO. Must also handle TX breaks here, since they
 *	are embedded as commands in the data stream. Oh no, had to use a goto!
 *	This could be optimized more, will do when I get time...
 *	In practice it is possible that interrupts are enabled but that the
 *	port has been hung up. Need to handle not having any TX buffer here,
 *	this is done by using the side effect that head and tail will also
 *	be NULL if the buffer has been freed.
 */

static void stl_cd1400txisr(stlpanel_t *panelp, int ioaddr)
{
	stlport_t	*portp;
	int		len, stlen;
	char		*head, *tail;
	unsigned char	ioack, srer;

#ifdef DEBUG
	printk("stl_cd1400txisr(panelp=%x,ioaddr=%x)\n", (int) panelp, ioaddr);
#endif

	ioack = inb(ioaddr + EREG_TXACK);
	if (((ioack & panelp->ackmask) != 0) ||
	    ((ioack & ACK_TYPMASK) != ACK_TYPTX)) {
		printk("STALLION: bad TX interrupt ack value=%x\n", ioack);
		return;
	}
	portp = panelp->ports[(ioack >> 3)];

/*
 *	Unfortunately we need to handle breaks in the data stream, since
 *	this is the only way to generate them on the cd1400. Do it now if
 *	a break is to be sent.
 */
	if (portp->brklen != 0)
		if (stl_cd1400breakisr(portp, ioaddr))
			goto stl_txalldone;

	head = portp->tx.head;
	tail = portp->tx.tail;
	len = (head >= tail) ? (head - tail) : (STL_TXBUFSIZE - (tail - head));
	if ((len == 0) || ((len < STL_TXBUFLOW) &&
	    (test_bit(ASYI_TXLOW, &portp->istate) == 0))) {
		set_bit(ASYI_TXLOW, &portp->istate);
		schedule_work(&portp->tqueue);
	}

	if (len == 0) {
		outb((SRER + portp->uartaddr), ioaddr);
		srer = inb(ioaddr + EREG_DATA);
		if (srer & SRER_TXDATA) {
			srer = (srer & ~SRER_TXDATA) | SRER_TXEMPTY;
		} else {
			srer &= ~(SRER_TXDATA | SRER_TXEMPTY);
			clear_bit(ASYI_TXBUSY, &portp->istate);
		}
		outb(srer, (ioaddr + EREG_DATA));
	} else {
		len = MIN(len, CD1400_TXFIFOSIZE);
		portp->stats.txtotal += len;
		stlen = MIN(len, ((portp->tx.buf + STL_TXBUFSIZE) - tail));
		outb((TDR + portp->uartaddr), ioaddr);
		outsb((ioaddr + EREG_DATA), tail, stlen);
		len -= stlen;
		tail += stlen;
		if (tail >= (portp->tx.buf + STL_TXBUFSIZE))
			tail = portp->tx.buf;
		if (len > 0) {
			outsb((ioaddr + EREG_DATA), tail, len);
			tail += len;
		}
		portp->tx.tail = tail;
	}

stl_txalldone:
	outb((EOSRR + portp->uartaddr), ioaddr);
	outb(0, (ioaddr + EREG_DATA));
}

/*****************************************************************************/

/*
 *	Receive character interrupt handler. Determine if we have good chars
 *	or bad chars and then process appropriately. Good chars are easy
 *	just shove the lot into the RX buffer and set all status byte to 0.
 *	If a bad RX char then process as required. This routine needs to be
 *	fast!  In practice it is possible that we get an interrupt on a port
 *	that is closed. This can happen on hangups - since they completely
 *	shutdown a port not in user context. Need to handle this case.
 */

static void stl_cd1400rxisr(stlpanel_t *panelp, int ioaddr)
{
	stlport_t		*portp;
	struct tty_struct	*tty;
	unsigned int		ioack, len, buflen;
	unsigned char		status;
	char			ch;

#ifdef DEBUG
	printk("stl_cd1400rxisr(panelp=%x,ioaddr=%x)\n", (int) panelp, ioaddr);
#endif

	ioack = inb(ioaddr + EREG_RXACK);
	if ((ioack & panelp->ackmask) != 0) {
		printk("STALLION: bad RX interrupt ack value=%x\n", ioack);
		return;
	}
	portp = panelp->ports[(ioack >> 3)];
	tty = portp->tty;

	if ((ioack & ACK_TYPMASK) == ACK_TYPRXGOOD) {
		outb((RDCR + portp->uartaddr), ioaddr);
		len = inb(ioaddr + EREG_DATA);
		if (tty == NULL || (buflen = tty_buffer_request_room(tty, len)) == 0) {
			len = MIN(len, sizeof(stl_unwanted));
			outb((RDSR + portp->uartaddr), ioaddr);
			insb((ioaddr + EREG_DATA), &stl_unwanted[0], len);
			portp->stats.rxlost += len;
			portp->stats.rxtotal += len;
		} else {
			len = MIN(len, buflen);
			if (len > 0) {
				unsigned char *ptr;
				outb((RDSR + portp->uartaddr), ioaddr);
				tty_prepare_flip_string(tty, &ptr, len);
				insb((ioaddr + EREG_DATA), ptr, len);
				tty_schedule_flip(tty);
				portp->stats.rxtotal += len;
			}
		}
	} else if ((ioack & ACK_TYPMASK) == ACK_TYPRXBAD) {
		outb((RDSR + portp->uartaddr), ioaddr);
		status = inb(ioaddr + EREG_DATA);
		ch = inb(ioaddr + EREG_DATA);
		if (status & ST_PARITY)
			portp->stats.rxparity++;
		if (status & ST_FRAMING)
			portp->stats.rxframing++;
		if (status & ST_OVERRUN)
			portp->stats.rxoverrun++;
		if (status & ST_BREAK)
			portp->stats.rxbreaks++;
		if (status & ST_SCHARMASK) {
			if ((status & ST_SCHARMASK) == ST_SCHAR1)
				portp->stats.txxon++;
			if ((status & ST_SCHARMASK) == ST_SCHAR2)
				portp->stats.txxoff++;
			goto stl_rxalldone;
		}
		if (tty != NULL && (portp->rxignoremsk & status) == 0) {
			if (portp->rxmarkmsk & status) {
				if (status & ST_BREAK) {
					status = TTY_BREAK;
					if (portp->flags & ASYNC_SAK) {
						do_SAK(tty);
						BRDENABLE(portp->brdnr, portp->pagenr);
					}
				} else if (status & ST_PARITY) {
					status = TTY_PARITY;
				} else if (status & ST_FRAMING) {
					status = TTY_FRAME;
				} else if(status & ST_OVERRUN) {
					status = TTY_OVERRUN;
				} else {
					status = 0;
				}
			} else {
				status = 0;
			}
			tty_insert_flip_char(tty, ch, status);
			tty_schedule_flip(tty);
		}
	} else {
		printk("STALLION: bad RX interrupt ack value=%x\n", ioack);
		return;
	}

stl_rxalldone:
	outb((EOSRR + portp->uartaddr), ioaddr);
	outb(0, (ioaddr + EREG_DATA));
}

/*****************************************************************************/

/*
 *	Modem interrupt handler. The is called when the modem signal line
 *	(DCD) has changed state. Leave most of the work to the off-level
 *	processing routine.
 */

static void stl_cd1400mdmisr(stlpanel_t *panelp, int ioaddr)
{
	stlport_t	*portp;
	unsigned int	ioack;
	unsigned char	misr;

#ifdef DEBUG
	printk("stl_cd1400mdmisr(panelp=%x)\n", (int) panelp);
#endif

	ioack = inb(ioaddr + EREG_MDACK);
	if (((ioack & panelp->ackmask) != 0) ||
	    ((ioack & ACK_TYPMASK) != ACK_TYPMDM)) {
		printk("STALLION: bad MODEM interrupt ack value=%x\n", ioack);
		return;
	}
	portp = panelp->ports[(ioack >> 3)];

	outb((MISR + portp->uartaddr), ioaddr);
	misr = inb(ioaddr + EREG_DATA);
	if (misr & MISR_DCD) {
		set_bit(ASYI_DCDCHANGE, &portp->istate);
		schedule_work(&portp->tqueue);
		portp->stats.modem++;
	}

	outb((EOSRR + portp->uartaddr), ioaddr);
	outb(0, (ioaddr + EREG_DATA));
}

/*****************************************************************************/
/*                      SC26198 HARDWARE FUNCTIONS                           */
/*****************************************************************************/

/*
 *	These functions get/set/update the registers of the sc26198 UARTs.
 *	Access to the sc26198 registers is via an address/data io port pair.
 *	(Maybe should make this inline...)
 */

static int stl_sc26198getreg(stlport_t *portp, int regnr)
{
	outb((regnr | portp->uartaddr), (portp->ioaddr + XP_ADDR));
	return inb(portp->ioaddr + XP_DATA);
}

static void stl_sc26198setreg(stlport_t *portp, int regnr, int value)
{
	outb((regnr | portp->uartaddr), (portp->ioaddr + XP_ADDR));
	outb(value, (portp->ioaddr + XP_DATA));
}

static int stl_sc26198updatereg(stlport_t *portp, int regnr, int value)
{
	outb((regnr | portp->uartaddr), (portp->ioaddr + XP_ADDR));
	if (inb(portp->ioaddr + XP_DATA) != value) {
		outb(value, (portp->ioaddr + XP_DATA));
		return 1;
	}
	return 0;
}

/*****************************************************************************/

/*
 *	Functions to get and set the sc26198 global registers.
 */

static int stl_sc26198getglobreg(stlport_t *portp, int regnr)
{
	outb(regnr, (portp->ioaddr + XP_ADDR));
	return inb(portp->ioaddr + XP_DATA);
}

#if 0
static void stl_sc26198setglobreg(stlport_t *portp, int regnr, int value)
{
	outb(regnr, (portp->ioaddr + XP_ADDR));
	outb(value, (portp->ioaddr + XP_DATA));
}
#endif

/*****************************************************************************/

/*
 *	Inbitialize the UARTs in a panel. We don't care what sort of board
 *	these ports are on - since the port io registers are almost
 *	identical when dealing with ports.
 */

static int stl_sc26198panelinit(stlbrd_t *brdp, stlpanel_t *panelp)
{
	int	chipmask, i;
	int	nrchips, ioaddr;

#ifdef DEBUG
	printk("stl_sc26198panelinit(brdp=%x,panelp=%x)\n",
		(int) brdp, (int) panelp);
#endif

	BRDENABLE(panelp->brdnr, panelp->pagenr);

/*
 *	Check that each chip is present and started up OK.
 */
	chipmask = 0;
	nrchips = (panelp->nrports + 4) / SC26198_PORTS;
	if (brdp->brdtype == BRD_ECHPCI)
		outb(panelp->pagenr, brdp->ioctrl);

	for (i = 0; (i < nrchips); i++) {
		ioaddr = panelp->iobase + (i * 4); 
		outb(SCCR, (ioaddr + XP_ADDR));
		outb(CR_RESETALL, (ioaddr + XP_DATA));
		outb(TSTR, (ioaddr + XP_ADDR));
		if (inb(ioaddr + XP_DATA) != 0) {
			printk("STALLION: sc26198 not responding, "
				"brd=%d panel=%d chip=%d\n",
				panelp->brdnr, panelp->panelnr, i);
			continue;
		}
		chipmask |= (0x1 << i);
		outb(GCCR, (ioaddr + XP_ADDR));
		outb(GCCR_IVRTYPCHANACK, (ioaddr + XP_DATA));
		outb(WDTRCR, (ioaddr + XP_ADDR));
		outb(0xff, (ioaddr + XP_DATA));
	}

	BRDDISABLE(panelp->brdnr);
	return chipmask;
}

/*****************************************************************************/

/*
 *	Initialize hardware specific port registers.
 */

static void stl_sc26198portinit(stlbrd_t *brdp, stlpanel_t *panelp, stlport_t *portp)
{
#ifdef DEBUG
	printk("stl_sc26198portinit(brdp=%x,panelp=%x,portp=%x)\n",
		(int) brdp, (int) panelp, (int) portp);
#endif

	if ((brdp == (stlbrd_t *) NULL) || (panelp == (stlpanel_t *) NULL) ||
	    (portp == (stlport_t *) NULL))
		return;

	portp->ioaddr = panelp->iobase + ((portp->portnr < 8) ? 0 : 4);
	portp->uartaddr = (portp->portnr & 0x07) << 4;
	portp->pagenr = panelp->pagenr;
	portp->hwid = 0x1;

	BRDENABLE(portp->brdnr, portp->pagenr);
	stl_sc26198setreg(portp, IOPCR, IOPCR_SETSIGS);
	BRDDISABLE(portp->brdnr);
}

/*****************************************************************************/

/*
 *	Set up the sc26198 registers for a port based on the termios port
 *	settings.
 */

static void stl_sc26198setport(stlport_t *portp, struct termios *tiosp)
{
	stlbrd_t	*brdp;
	unsigned long	flags;
	unsigned int	baudrate;
	unsigned char	mr0, mr1, mr2, clk;
	unsigned char	imron, imroff, iopr, ipr;

	mr0 = 0;
	mr1 = 0;
	mr2 = 0;
	clk = 0;
	iopr = 0;
	imron = 0;
	imroff = 0;

	brdp = stl_brds[portp->brdnr];
	if (brdp == (stlbrd_t *) NULL)
		return;

/*
 *	Set up the RX char ignore mask with those RX error types we
 *	can ignore.
 */
	portp->rxignoremsk = 0;
	if (tiosp->c_iflag & IGNPAR)
		portp->rxignoremsk |= (SR_RXPARITY | SR_RXFRAMING |
			SR_RXOVERRUN);
	if (tiosp->c_iflag & IGNBRK)
		portp->rxignoremsk |= SR_RXBREAK;

	portp->rxmarkmsk = SR_RXOVERRUN;
	if (tiosp->c_iflag & (INPCK | PARMRK))
		portp->rxmarkmsk |= (SR_RXPARITY | SR_RXFRAMING);
	if (tiosp->c_iflag & BRKINT)
		portp->rxmarkmsk |= SR_RXBREAK;

/*
 *	Go through the char size, parity and stop bits and set all the
 *	option register appropriately.
 */
	switch (tiosp->c_cflag & CSIZE) {
	case CS5:
		mr1 |= MR1_CS5;
		break;
	case CS6:
		mr1 |= MR1_CS6;
		break;
	case CS7:
		mr1 |= MR1_CS7;
		break;
	default:
		mr1 |= MR1_CS8;
		break;
	}

	if (tiosp->c_cflag & CSTOPB)
		mr2 |= MR2_STOP2;
	else
		mr2 |= MR2_STOP1;

	if (tiosp->c_cflag & PARENB) {
		if (tiosp->c_cflag & PARODD)
			mr1 |= (MR1_PARENB | MR1_PARODD);
		else
			mr1 |= (MR1_PARENB | MR1_PAREVEN);
	} else {
		mr1 |= MR1_PARNONE;
	}

	mr1 |= MR1_ERRBLOCK;

/*
 *	Set the RX FIFO threshold at 8 chars. This gives a bit of breathing
 *	space for hardware flow control and the like. This should be set to
 *	VMIN.
 */
	mr2 |= MR2_RXFIFOHALF;

/*
 *	Calculate the baud rate timers. For now we will just assume that
 *	the input and output baud are the same. The sc26198 has a fixed
 *	baud rate table, so only discrete baud rates possible.
 */
	baudrate = tiosp->c_cflag & CBAUD;
	if (baudrate & CBAUDEX) {
		baudrate &= ~CBAUDEX;
		if ((baudrate < 1) || (baudrate > 4))
			tiosp->c_cflag &= ~CBAUDEX;
		else
			baudrate += 15;
	}
	baudrate = stl_baudrates[baudrate];
	if ((tiosp->c_cflag & CBAUD) == B38400) {
		if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
			baudrate = 57600;
		else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
			baudrate = 115200;
		else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
			baudrate = 230400;
		else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
			baudrate = 460800;
		else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
			baudrate = (portp->baud_base / portp->custom_divisor);
	}
	if (baudrate > STL_SC26198MAXBAUD)
		baudrate = STL_SC26198MAXBAUD;

	if (baudrate > 0) {
		for (clk = 0; (clk < SC26198_NRBAUDS); clk++) {
			if (baudrate <= sc26198_baudtable[clk])
				break;
		}
	}

/*
 *	Check what form of modem signaling is required and set it up.
 */
	if (tiosp->c_cflag & CLOCAL) {
		portp->flags &= ~ASYNC_CHECK_CD;
	} else {
		iopr |= IOPR_DCDCOS;
		imron |= IR_IOPORT;
		portp->flags |= ASYNC_CHECK_CD;
	}

/*
 *	Setup sc26198 enhanced modes if we can. In particular we want to
 *	handle as much of the flow control as possible automatically. As
 *	well as saving a few CPU cycles it will also greatly improve flow
 *	control reliability.
 */
	if (tiosp->c_iflag & IXON) {
		mr0 |= MR0_SWFTX | MR0_SWFT;
		imron |= IR_XONXOFF;
	} else {
		imroff |= IR_XONXOFF;
	}
	if (tiosp->c_iflag & IXOFF)
		mr0 |= MR0_SWFRX;

	if (tiosp->c_cflag & CRTSCTS) {
		mr2 |= MR2_AUTOCTS;
		mr1 |= MR1_AUTORTS;
	}

/*
 *	All sc26198 register values calculated so go through and set
 *	them all up.
 */

#ifdef DEBUG
	printk("SETPORT: portnr=%d panelnr=%d brdnr=%d\n",
		portp->portnr, portp->panelnr, portp->brdnr);
	printk("    mr0=%x mr1=%x mr2=%x clk=%x\n", mr0, mr1, mr2, clk);
	printk("    iopr=%x imron=%x imroff=%x\n", iopr, imron, imroff);
	printk("    schr1=%x schr2=%x schr3=%x schr4=%x\n",
		tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP],
		tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP]);
#endif

	save_flags(flags);
	cli();
	BRDENABLE(portp->brdnr, portp->pagenr);
	stl_sc26198setreg(portp, IMR, 0);
	stl_sc26198updatereg(portp, MR0, mr0);
	stl_sc26198updatereg(portp, MR1, mr1);
	stl_sc26198setreg(portp, SCCR, CR_RXERRBLOCK);
	stl_sc26198updatereg(portp, MR2, mr2);
	stl_sc26198updatereg(portp, IOPIOR,
		((stl_sc26198getreg(portp, IOPIOR) & ~IPR_CHANGEMASK) | iopr));

	if (baudrate > 0) {
		stl_sc26198setreg(portp, TXCSR, clk);
		stl_sc26198setreg(portp, RXCSR, clk);
	}

	stl_sc26198setreg(portp, XONCR, tiosp->c_cc[VSTART]);
	stl_sc26198setreg(portp, XOFFCR, tiosp->c_cc[VSTOP]);

	ipr = stl_sc26198getreg(portp, IPR);
	if (ipr & IPR_DCD)
		portp->sigs &= ~TIOCM_CD;
	else
		portp->sigs |= TIOCM_CD;

	portp->imr = (portp->imr & ~imroff) | imron;
	stl_sc26198setreg(portp, IMR, portp->imr);
	BRDDISABLE(portp->brdnr);
	restore_flags(flags);
}

/*****************************************************************************/

/*
 *	Set the state of the DTR and RTS signals.
 */

static void stl_sc26198setsignals(stlport_t *portp, int dtr, int rts)
{
	unsigned char	iopioron, iopioroff;
	unsigned long	flags;

#ifdef DEBUG
	printk("stl_sc26198setsignals(portp=%x,dtr=%d,rts=%d)\n",
		(int) portp, dtr, rts);
#endif

	iopioron = 0;
	iopioroff = 0;
	if (dtr == 0)
		iopioroff |= IPR_DTR;
	else if (dtr > 0)
		iopioron |= IPR_DTR;
	if (rts == 0)
		iopioroff |= IPR_RTS;
	else if (rts > 0)
		iopioron |= IPR_RTS;

	save_flags(flags);
	cli();
	BRDENABLE(portp->brdnr, portp->pagenr);
	stl_sc26198setreg(portp, IOPIOR,
		((stl_sc26198getreg(portp, IOPIOR) & ~iopioroff) | iopioron));
	BRDDISABLE(portp->brdnr);
	restore_flags(flags);
}

/*****************************************************************************/

/*
 *	Return the state of the signals.
 */

static int stl_sc26198getsignals(stlport_t *portp)
{
	unsigned char	ipr;
	unsigned long	flags;
	int		sigs;

#ifdef DEBUG
	printk("stl_sc26198getsignals(portp=%x)\n", (int) portp);
#endif

	save_flags(flags);
	cli();
	BRDENABLE(portp->brdnr, portp->pagenr);
	ipr = stl_sc26198getreg(portp, IPR);
	BRDDISABLE(portp->brdnr);
	restore_flags(flags);

	sigs = 0;
	sigs |= (ipr & IPR_DCD) ? 0 : TIOCM_CD;
	sigs |= (ipr & IPR_CTS) ? 0 : TIOCM_CTS;
	sigs |= (ipr & IPR_DTR) ? 0: TIOCM_DTR;
	sigs |= (ipr & IPR_RTS) ? 0: TIOCM_RTS;
	sigs |= TIOCM_DSR;
	return sigs;
}

/*****************************************************************************/

/*
 *	Enable/Disable the Transmitter and/or Receiver.
 */

static void stl_sc26198enablerxtx(stlport_t *portp, int rx, int tx)
{
	unsigned char	ccr;
	unsigned long	flags;

#ifdef DEBUG
	printk("stl_sc26198enablerxtx(portp=%x,rx=%d,tx=%d)\n",
		(int) portp, rx, tx);
#endif

	ccr = portp->crenable;
	if (tx == 0)
		ccr &= ~CR_TXENABLE;
	else if (tx > 0)
		ccr |= CR_TXENABLE;
	if (rx == 0)
		ccr &= ~CR_RXENABLE;
	else if (rx > 0)
		ccr |= CR_RXENABLE;

	save_flags(flags);
	cli();
	BRDENABLE(portp->brdnr, portp->pagenr);
	stl_sc26198setreg(portp, SCCR, ccr);
	BRDDISABLE(portp->brdnr);
	portp->crenable = ccr;
	restore_flags(flags);
}

/*****************************************************************************/

/*
 *	Start/stop the Transmitter and/or Receiver.
 */

static void stl_sc26198startrxtx(stlport_t *portp, int rx, int tx)
{
	unsigned char	imr;
	unsigned long	flags;

#ifdef DEBUG
	printk("stl_sc26198startrxtx(portp=%x,rx=%d,tx=%d)\n",
		(int) portp, rx, tx);
#endif

	imr = portp->imr;
	if (tx == 0)
		imr &= ~IR_TXRDY;
	else if (tx == 1)
		imr |= IR_TXRDY;
	if (rx == 0)
		imr &= ~(IR_RXRDY | IR_RXBREAK | IR_RXWATCHDOG);
	else if (rx > 0)
		imr |= IR_RXRDY | IR_RXBREAK | IR_RXWATCHDOG;

	save_flags(flags);
	cli();
	BRDENABLE(portp->brdnr, portp->pagenr);
	stl_sc26198setreg(portp, IMR, imr);
	BRDDISABLE(portp->brdnr);
	portp->imr = imr;
	if (tx > 0)
		set_bit(ASYI_TXBUSY, &portp->istate);
	restore_flags(flags);
}

/*****************************************************************************/

/*
 *	Disable all interrupts from this port.
 */

static void stl_sc26198disableintrs(stlport_t *portp)
{
	unsigned long	flags;

#ifdef DEBUG
	printk("stl_sc26198disableintrs(portp=%x)\n", (int) portp);
#endif

	save_flags(flags);
	cli();
	BRDENABLE(portp->brdnr, portp->pagenr);
	portp->imr = 0;
	stl_sc26198setreg(portp, IMR, 0);
	BRDDISABLE(portp->brdnr);
	restore_flags(flags);
}

/*****************************************************************************/

static void stl_sc26198sendbreak(stlport_t *portp, int len)
{
	unsigned long	flags;

#ifdef DEBUG
	printk("stl_sc26198sendbreak(portp=%x,len=%d)\n", (int) portp, len);
#endif

	save_flags(flags);
	cli();
	BRDENABLE(portp->brdnr, portp->pagenr);
	if (len == 1) {
		stl_sc26198setreg(portp, SCCR, CR_TXSTARTBREAK);
		portp->stats.txbreaks++;
	} else {
		stl_sc26198setreg(portp, SCCR, CR_TXSTOPBREAK);
	}
	BRDDISABLE(portp->brdnr);
	restore_flags(flags);
}

/*****************************************************************************/

/*
 *	Take flow control actions...
 */

static void stl_sc26198flowctrl(stlport_t *portp, int state)
{
	struct tty_struct	*tty;
	unsigned long		flags;
	unsigned char		mr0;

#ifdef DEBUG
	printk("stl_sc26198flowctrl(portp=%x,state=%x)\n", (int) portp, state);
#endif

	if (portp == (stlport_t *) NULL)
		return;
	tty = portp->tty;
	if (tty == (struct tty_struct *) NULL)
		return;

	save_flags(flags);
	cli();
	BRDENABLE(portp->brdnr, portp->pagenr);

	if (state) {
		if (tty->termios->c_iflag & IXOFF) {
			mr0 = stl_sc26198getreg(portp, MR0);
			stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
			stl_sc26198setreg(portp, SCCR, CR_TXSENDXON);
			mr0 |= MR0_SWFRX;
			portp->stats.rxxon++;
			stl_sc26198wait(portp);
			stl_sc26198setreg(portp, MR0, mr0);
		}
/*
 *		Question: should we return RTS to what it was before? It may
 *		have been set by an ioctl... Suppose not, since if you have
 *		hardware flow control set then it is pretty silly to go and
 *		set the RTS line by hand.
 */
		if (tty->termios->c_cflag & CRTSCTS) {
			stl_sc26198setreg(portp, MR1,
				(stl_sc26198getreg(portp, MR1) | MR1_AUTORTS));
			stl_sc26198setreg(portp, IOPIOR,
				(stl_sc26198getreg(portp, IOPIOR) | IOPR_RTS));
			portp->stats.rxrtson++;
		}
	} else {
		if (tty->termios->c_iflag & IXOFF) {
			mr0 = stl_sc26198getreg(portp, MR0);
			stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
			stl_sc26198setreg(portp, SCCR, CR_TXSENDXOFF);
			mr0 &= ~MR0_SWFRX;
			portp->stats.rxxoff++;
			stl_sc26198wait(portp);
			stl_sc26198setreg(portp, MR0, mr0);
		}
		if (tty->termios->c_cflag & CRTSCTS) {
			stl_sc26198setreg(portp, MR1,
				(stl_sc26198getreg(portp, MR1) & ~MR1_AUTORTS));
			stl_sc26198setreg(portp, IOPIOR,
				(stl_sc26198getreg(portp, IOPIOR) & ~IOPR_RTS));
			portp->stats.rxrtsoff++;
		}
	}

	BRDDISABLE(portp->brdnr);
	restore_flags(flags);
}

/*****************************************************************************/

/*
 *	Send a flow control character.
 */

static void stl_sc26198sendflow(stlport_t *portp, int state)
{
	struct tty_struct	*tty;
	unsigned long		flags;
	unsigned char		mr0;

#ifdef DEBUG
	printk("stl_sc26198sendflow(portp=%x,state=%x)\n", (int) portp, state);
#endif

	if (portp == (stlport_t *) NULL)
		return;
	tty = portp->tty;
	if (tty == (struct tty_struct *) NULL)
		return;

	save_flags(flags);
	cli();
	BRDENABLE(portp->brdnr, portp->pagenr);
	if (state) {
		mr0 = stl_sc26198getreg(portp, MR0);
		stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
		stl_sc26198setreg(portp, SCCR, CR_TXSENDXON);
		mr0 |= MR0_SWFRX;
		portp->stats.rxxon++;
		stl_sc26198wait(portp);
		stl_sc26198setreg(portp, MR0, mr0);
	} else {
		mr0 = stl_sc26198getreg(portp, MR0);
		stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
		stl_sc26198setreg(portp, SCCR, CR_TXSENDXOFF);
		mr0 &= ~MR0_SWFRX;
		portp->stats.rxxoff++;
		stl_sc26198wait(portp);
		stl_sc26198setreg(portp, MR0, mr0);
	}
	BRDDISABLE(portp->brdnr);
	restore_flags(flags);
}

/*****************************************************************************/

static void stl_sc26198flush(stlport_t *portp)
{
	unsigned long	flags;

#ifdef DEBUG
	printk("stl_sc26198flush(portp=%x)\n", (int) portp);
#endif

	if (portp == (stlport_t *) NULL)
		return;

	save_flags(flags);
	cli();
	BRDENABLE(portp->brdnr, portp->pagenr);
	stl_sc26198setreg(portp, SCCR, CR_TXRESET);
	stl_sc26198setreg(portp, SCCR, portp->crenable);
	BRDDISABLE(portp->brdnr);
	portp->tx.tail = portp->tx.head;
	restore_flags(flags);
}

/*****************************************************************************/

/*
 *	Return the current state of data flow on this port. This is only
 *	really interresting when determining if data has fully completed
 *	transmission or not... The sc26198 interrupt scheme cannot
 *	determine when all data has actually drained, so we need to
 *	check the port statusy register to be sure.
 */

static int stl_sc26198datastate(stlport_t *portp)
{
	unsigned long	flags;
	unsigned char	sr;

#ifdef DEBUG
	printk("stl_sc26198datastate(portp=%x)\n", (int) portp);
#endif

	if (portp == (stlport_t *) NULL)
		return 0;
	if (test_bit(ASYI_TXBUSY, &portp->istate))
		return 1;

	save_flags(flags);
	cli();
	BRDENABLE(portp->brdnr, portp->pagenr);
	sr = stl_sc26198getreg(portp, SR);
	BRDDISABLE(portp->brdnr);
	restore_flags(flags);

	return (sr & SR_TXEMPTY) ? 0 : 1;
}

/*****************************************************************************/

/*
 *	Delay for a small amount of time, to give the sc26198 a chance
 *	to process a command...
 */

static void stl_sc26198wait(stlport_t *portp)
{
	int	i;

#ifdef DEBUG
	printk("stl_sc26198wait(portp=%x)\n", (int) portp);
#endif

	if (portp == (stlport_t *) NULL)
		return;

	for (i = 0; (i < 20); i++)
		stl_sc26198getglobreg(portp, TSTR);
}

/*****************************************************************************/

/*
 *	If we are TX flow controlled and in IXANY mode then we may
 *	need to unflow control here. We gotta do this because of the
 *	automatic flow control modes of the sc26198.
 */

static inline void stl_sc26198txunflow(stlport_t *portp, struct tty_struct *tty)
{
	unsigned char	mr0;

	mr0 = stl_sc26198getreg(portp, MR0);
	stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
	stl_sc26198setreg(portp, SCCR, CR_HOSTXON);
	stl_sc26198wait(portp);
	stl_sc26198setreg(portp, MR0, mr0);
	clear_bit(ASYI_TXFLOWED, &portp->istate);
}

/*****************************************************************************/

/*
 *	Interrupt service routine for sc26198 panels.
 */

static void stl_sc26198intr(stlpanel_t *panelp, unsigned int iobase)
{
	stlport_t	*portp;
	unsigned int	iack;

/* 
 *	Work around bug in sc26198 chip... Cannot have A6 address
 *	line of UART high, else iack will be returned as 0.
 */
	outb(0, (iobase + 1));

	iack = inb(iobase + XP_IACK);
	portp = panelp->ports[(iack & IVR_CHANMASK) + ((iobase & 0x4) << 1)];

	if (iack & IVR_RXDATA)
		stl_sc26198rxisr(portp, iack);
	else if (iack & IVR_TXDATA)
		stl_sc26198txisr(portp);
	else
		stl_sc26198otherisr(portp, iack);
}

/*****************************************************************************/

/*
 *	Transmit interrupt handler. This has gotta be fast!  Handling TX
 *	chars is pretty simple, stuff as many as possible from the TX buffer
 *	into the sc26198 FIFO.
 *	In practice it is possible that interrupts are enabled but that the
 *	port has been hung up. Need to handle not having any TX buffer here,
 *	this is done by using the side effect that head and tail will also
 *	be NULL if the buffer has been freed.
 */

static void stl_sc26198txisr(stlport_t *portp)
{
	unsigned int	ioaddr;
	unsigned char	mr0;
	int		len, stlen;
	char		*head, *tail;

#ifdef DEBUG
	printk("stl_sc26198txisr(portp=%x)\n", (int) portp);
#endif

	ioaddr = portp->ioaddr;
	head = portp->tx.head;
	tail = portp->tx.tail;
	len = (head >= tail) ? (head - tail) : (STL_TXBUFSIZE - (tail - head));
	if ((len == 0) || ((len < STL_TXBUFLOW) &&
	    (test_bit(ASYI_TXLOW, &portp->istate) == 0))) {
		set_bit(ASYI_TXLOW, &portp->istate);
		schedule_work(&portp->tqueue); 
	}

	if (len == 0) {
		outb((MR0 | portp->uartaddr), (ioaddr + XP_ADDR));
		mr0 = inb(ioaddr + XP_DATA);
		if ((mr0 & MR0_TXMASK) == MR0_TXEMPTY) {
			portp->imr &= ~IR_TXRDY;
			outb((IMR | portp->uartaddr), (ioaddr + XP_ADDR));
			outb(portp->imr, (ioaddr + XP_DATA));
			clear_bit(ASYI_TXBUSY, &portp->istate);
		} else {
			mr0 |= ((mr0 & ~MR0_TXMASK) | MR0_TXEMPTY);
			outb(mr0, (ioaddr + XP_DATA));
		}
	} else {
		len = MIN(len, SC26198_TXFIFOSIZE);
		portp->stats.txtotal += len;
		stlen = MIN(len, ((portp->tx.buf + STL_TXBUFSIZE) - tail));
		outb(GTXFIFO, (ioaddr + XP_ADDR));
		outsb((ioaddr + XP_DATA), tail, stlen);
		len -= stlen;
		tail += stlen;
		if (tail >= (portp->tx.buf + STL_TXBUFSIZE))
			tail = portp->tx.buf;
		if (len > 0) {
			outsb((ioaddr + XP_DATA), tail, len);
			tail += len;
		}
		portp->tx.tail = tail;
	}
}

/*****************************************************************************/

/*
 *	Receive character interrupt handler. Determine if we have good chars
 *	or bad chars and then process appropriately. Good chars are easy
 *	just shove the lot into the RX buffer and set all status byte to 0.
 *	If a bad RX char then process as required. This routine needs to be
 *	fast!  In practice it is possible that we get an interrupt on a port
 *	that is closed. This can happen on hangups - since they completely
 *	shutdown a port not in user context. Need to handle this case.
 */

static void stl_sc26198rxisr(stlport_t *portp, unsigned int iack)
{
	struct tty_struct	*tty;
	unsigned int		len, buflen, ioaddr;

#ifdef DEBUG
	printk("stl_sc26198rxisr(portp=%x,iack=%x)\n", (int) portp, iack);
#endif

	tty = portp->tty;
	ioaddr = portp->ioaddr;
	outb(GIBCR, (ioaddr + XP_ADDR));
	len = inb(ioaddr + XP_DATA) + 1;

	if ((iack & IVR_TYPEMASK) == IVR_RXDATA) {
		if (tty == NULL || (buflen = tty_buffer_request_room(tty, len)) == 0) {
			len = MIN(len, sizeof(stl_unwanted));
			outb(GRXFIFO, (ioaddr + XP_ADDR));
			insb((ioaddr + XP_DATA), &stl_unwanted[0], len);
			portp->stats.rxlost += len;
			portp->stats.rxtotal += len;
		} else {
			len = MIN(len, buflen);
			if (len > 0) {
				unsigned char *ptr;
				outb(GRXFIFO, (ioaddr + XP_ADDR));
				tty_prepare_flip_string(tty, &ptr, len);
				insb((ioaddr + XP_DATA), ptr, len);
				tty_schedule_flip(tty);
				portp->stats.rxtotal += len;
			}
		}
	} else {
		stl_sc26198rxbadchars(portp);
	}

/*
 *	If we are TX flow controlled and in IXANY mode then we may need
 *	to unflow control here. We gotta do this because of the automatic
 *	flow control modes of the sc26198.
 */
	if (test_bit(ASYI_TXFLOWED, &portp->istate)) {
		if ((tty != (struct tty_struct *) NULL) &&
		    (tty->termios != (struct termios *) NULL) &&
		    (tty->termios->c_iflag & IXANY)) {
			stl_sc26198txunflow(portp, tty);
		}
	}
}

/*****************************************************************************/

/*
 *	Process an RX bad character.
 */

static inline void stl_sc26198rxbadch(stlport_t *portp, unsigned char status, char ch)
{
	struct tty_struct	*tty;
	unsigned int		ioaddr;

	tty = portp->tty;
	ioaddr = portp->ioaddr;

	if (status & SR_RXPARITY)
		portp->stats.rxparity++;
	if (status & SR_RXFRAMING)
		portp->stats.rxframing++;
	if (status & SR_RXOVERRUN)
		portp->stats.rxoverrun++;
	if (status & SR_RXBREAK)
		portp->stats.rxbreaks++;

	if ((tty != (struct tty_struct *) NULL) &&
	    ((portp->rxignoremsk & status) == 0)) {
		if (portp->rxmarkmsk & status) {
			if (status & SR_RXBREAK) {
				status = TTY_BREAK;
				if (portp->flags & ASYNC_SAK) {
					do_SAK(tty);
					BRDENABLE(portp->brdnr, portp->pagenr);
				}
			} else if (status & SR_RXPARITY) {
				status = TTY_PARITY;
			} else if (status & SR_RXFRAMING) {
				status = TTY_FRAME;
			} else if(status & SR_RXOVERRUN) {
				status = TTY_OVERRUN;
			} else {
				status = 0;
			}
		} else {
			status = 0;
		}

		tty_insert_flip_char(tty, ch, status);
		tty_schedule_flip(tty);

		if (status == 0)
			portp->stats.rxtotal++;
	}
}

/*****************************************************************************/

/*
 *	Process all characters in the RX FIFO of the UART. Check all char
 *	status bytes as well, and process as required. We need to check
 *	all bytes in the FIFO, in case some more enter the FIFO while we
 *	are here. To get the exact character error type we need to switch
 *	into CHAR error mode (that is why we need to make sure we empty
 *	the FIFO).
 */

static void stl_sc26198rxbadchars(stlport_t *portp)
{
	unsigned char	status, mr1;
	char		ch;

/*
 *	To get the precise error type for each character we must switch
 *	back into CHAR error mode.
 */
	mr1 = stl_sc26198getreg(portp, MR1);
	stl_sc26198setreg(portp, MR1, (mr1 & ~MR1_ERRBLOCK));

	while ((status = stl_sc26198getreg(portp, SR)) & SR_RXRDY) {
		stl_sc26198setreg(portp, SCCR, CR_CLEARRXERR);
		ch = stl_sc26198getreg(portp, RXFIFO);
		stl_sc26198rxbadch(portp, status, ch);
	}

/*
 *	To get correct interrupt class we must switch back into BLOCK
 *	error mode.
 */
	stl_sc26198setreg(portp, MR1, mr1);
}

/*****************************************************************************/

/*
 *	Other interrupt handler. This includes modem signals, flow
 *	control actions, etc. Most stuff is left to off-level interrupt
 *	processing time.
 */

static void stl_sc26198otherisr(stlport_t *portp, unsigned int iack)
{
	unsigned char	cir, ipr, xisr;

#ifdef DEBUG
	printk("stl_sc26198otherisr(portp=%x,iack=%x)\n", (int) portp, iack);
#endif

	cir = stl_sc26198getglobreg(portp, CIR);

	switch (cir & CIR_SUBTYPEMASK) {
	case CIR_SUBCOS:
		ipr = stl_sc26198getreg(portp, IPR);
		if (ipr & IPR_DCDCHANGE) {
			set_bit(ASYI_DCDCHANGE, &portp->istate);
			schedule_work(&portp->tqueue); 
			portp->stats.modem++;
		}
		break;
	case CIR_SUBXONXOFF:
		xisr = stl_sc26198getreg(portp, XISR);
		if (xisr & XISR_RXXONGOT) {
			set_bit(ASYI_TXFLOWED, &portp->istate);
			portp->stats.txxoff++;
		}
		if (xisr & XISR_RXXOFFGOT) {
			clear_bit(ASYI_TXFLOWED, &portp->istate);
			portp->stats.txxon++;
		}
		break;
	case CIR_SUBBREAK:
		stl_sc26198setreg(portp, SCCR, CR_BREAKRESET);
		stl_sc26198rxbadchars(portp);
		break;
	default:
		break;
	}
}

/*****************************************************************************/