summaryrefslogtreecommitdiffstats
path: root/drivers/char/moxa.c
blob: 6799588b009976ca5d0efd98a065fd60f21d902d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
/*****************************************************************************/
/*
 *           moxa.c  -- MOXA Intellio family multiport serial driver.
 *
 *      Copyright (C) 1999-2000  Moxa Technologies (support@moxa.com).
 *      Copyright (c) 2007 Jiri Slaby <jirislaby@gmail.com>
 *
 *      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.
 */

/*
 *    MOXA Intellio Series Driver
 *      for             : LINUX
 *      date            : 1999/1/7
 *      version         : 5.1
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/errno.h>
#include <linux/firmware.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/serial.h>
#include <linux/tty_driver.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/bitops.h>

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

#include "moxa.h"

#define MOXA_VERSION		"6.0k"

#define MOXA_FW_HDRLEN		32

#define MOXAMAJOR		172

#define MAX_BOARDS		4	/* Don't change this value */
#define MAX_PORTS_PER_BOARD	32	/* Don't change this value */
#define MAX_PORTS		(MAX_BOARDS * MAX_PORTS_PER_BOARD)

#define MOXA_IS_320(brd) ((brd)->boardType == MOXA_BOARD_C320_ISA || \
		(brd)->boardType == MOXA_BOARD_C320_PCI)

/*
 *    Define the Moxa PCI vendor and device IDs.
 */
#define MOXA_BUS_TYPE_ISA	0
#define MOXA_BUS_TYPE_PCI	1

enum {
	MOXA_BOARD_C218_PCI = 1,
	MOXA_BOARD_C218_ISA,
	MOXA_BOARD_C320_PCI,
	MOXA_BOARD_C320_ISA,
	MOXA_BOARD_CP204J,
};

static char *moxa_brdname[] =
{
	"C218 Turbo PCI series",
	"C218 Turbo ISA series",
	"C320 Turbo PCI series",
	"C320 Turbo ISA series",
	"CP-204J series",
};

#ifdef CONFIG_PCI
static struct pci_device_id moxa_pcibrds[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C218),
		.driver_data = MOXA_BOARD_C218_PCI },
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C320),
		.driver_data = MOXA_BOARD_C320_PCI },
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP204J),
		.driver_data = MOXA_BOARD_CP204J },
	{ 0 }
};
MODULE_DEVICE_TABLE(pci, moxa_pcibrds);
#endif /* CONFIG_PCI */

struct moxa_port;

static struct moxa_board_conf {
	int boardType;
	int numPorts;
	int busType;

	unsigned int ready;

	struct moxa_port *ports;

	void __iomem *basemem;
	void __iomem *intNdx;
	void __iomem *intPend;
	void __iomem *intTable;
} moxa_boards[MAX_BOARDS];

struct mxser_mstatus {
	tcflag_t cflag;
	int cts;
	int dsr;
	int ri;
	int dcd;
};

struct moxaq_str {
	int inq;
	int outq;
};

struct moxa_port {
	struct tty_port port;
	struct moxa_board_conf *board;
	void __iomem *tableAddr;

	int type;
	int cflag;
	unsigned long statusflags;

	u8 DCDState;
	u8 lineCtrl;
	u8 lowChkFlag;
};

struct mon_str {
	int tick;
	int rxcnt[MAX_PORTS];
	int txcnt[MAX_PORTS];
};

/* statusflags */
#define TXSTOPPED	0x1
#define LOWWAIT 	0x2
#define EMPTYWAIT	0x4
#define THROTTLE	0x8

#define SERIAL_DO_RESTART

#define WAKEUP_CHARS		256

static int ttymajor = MOXAMAJOR;
static struct mon_str moxaLog;
static unsigned int moxaFuncTout = HZ / 2;
static unsigned int moxaLowWaterChk;
static DEFINE_MUTEX(moxa_openlock);
/* Variables for insmod */
#ifdef MODULE
static unsigned long baseaddr[MAX_BOARDS];
static unsigned int type[MAX_BOARDS];
static unsigned int numports[MAX_BOARDS];
#endif

MODULE_AUTHOR("William Chen");
MODULE_DESCRIPTION("MOXA Intellio Family Multiport Board Device Driver");
MODULE_LICENSE("GPL");
#ifdef MODULE
module_param_array(type, uint, NULL, 0);
MODULE_PARM_DESC(type, "card type: C218=2, C320=4");
module_param_array(baseaddr, ulong, NULL, 0);
MODULE_PARM_DESC(baseaddr, "base address");
module_param_array(numports, uint, NULL, 0);
MODULE_PARM_DESC(numports, "numports (ignored for C218)");
#endif
module_param(ttymajor, int, 0);

/*
 * static functions:
 */
static int moxa_open(struct tty_struct *, struct file *);
static void moxa_close(struct tty_struct *, struct file *);
static int moxa_write(struct tty_struct *, const unsigned char *, int);
static int moxa_write_room(struct tty_struct *);
static void moxa_flush_buffer(struct tty_struct *);
static int moxa_chars_in_buffer(struct tty_struct *);
static void moxa_throttle(struct tty_struct *);
static void moxa_unthrottle(struct tty_struct *);
static void moxa_set_termios(struct tty_struct *, struct ktermios *);
static void moxa_stop(struct tty_struct *);
static void moxa_start(struct tty_struct *);
static void moxa_hangup(struct tty_struct *);
static int moxa_tiocmget(struct tty_struct *tty, struct file *file);
static int moxa_tiocmset(struct tty_struct *tty, struct file *file,
			 unsigned int set, unsigned int clear);
static void moxa_poll(unsigned long);
static void moxa_set_tty_param(struct tty_struct *, struct ktermios *);
static void moxa_setup_empty_event(struct tty_struct *);
static void moxa_shut_down(struct tty_struct *);
static int moxa_carrier_raised(struct tty_port *);
/*
 * moxa board interface functions:
 */
static void MoxaPortEnable(struct moxa_port *);
static void MoxaPortDisable(struct moxa_port *);
static int MoxaPortSetTermio(struct moxa_port *, struct ktermios *, speed_t);
static int MoxaPortGetLineOut(struct moxa_port *, int *, int *);
static void MoxaPortLineCtrl(struct moxa_port *, int, int);
static void MoxaPortFlowCtrl(struct moxa_port *, int, int, int, int, int);
static int MoxaPortLineStatus(struct moxa_port *);
static void MoxaPortFlushData(struct moxa_port *, int);
static int MoxaPortWriteData(struct tty_struct *, const unsigned char *, int);
static int MoxaPortReadData(struct moxa_port *);
static int MoxaPortTxQueue(struct moxa_port *);
static int MoxaPortRxQueue(struct moxa_port *);
static int MoxaPortTxFree(struct moxa_port *);
static void MoxaPortTxDisable(struct moxa_port *);
static void MoxaPortTxEnable(struct moxa_port *);
static int moxa_get_serial_info(struct moxa_port *, struct serial_struct __user *);
static int moxa_set_serial_info(struct moxa_port *, struct serial_struct __user *);
static void MoxaSetFifo(struct moxa_port *port, int enable);

/*
 * I/O functions
 */

static void moxa_wait_finish(void __iomem *ofsAddr)
{
	unsigned long end = jiffies + moxaFuncTout;

	while (readw(ofsAddr + FuncCode) != 0)
		if (time_after(jiffies, end))
			return;
	if (readw(ofsAddr + FuncCode) != 0 && printk_ratelimit())
		printk(KERN_WARNING "moxa function expired\n");
}

static void moxafunc(void __iomem *ofsAddr, u16 cmd, u16 arg)
{
	writew(arg, ofsAddr + FuncArg);
	writew(cmd, ofsAddr + FuncCode);
	moxa_wait_finish(ofsAddr);
}

static void moxa_low_water_check(void __iomem *ofsAddr)
{
	u16 rptr, wptr, mask, len;

	if (readb(ofsAddr + FlagStat) & Xoff_state) {
		rptr = readw(ofsAddr + RXrptr);
		wptr = readw(ofsAddr + RXwptr);
		mask = readw(ofsAddr + RX_mask);
		len = (wptr - rptr) & mask;
		if (len <= Low_water)
			moxafunc(ofsAddr, FC_SendXon, 0);
	}
}

/*
 * TTY operations
 */

static int moxa_ioctl(struct tty_struct *tty, struct file *file,
		      unsigned int cmd, unsigned long arg)
{
	struct moxa_port *ch = tty->driver_data;
	void __user *argp = (void __user *)arg;
	int status, ret = 0;

	if (tty->index == MAX_PORTS) {
		if (cmd != MOXA_GETDATACOUNT && cmd != MOXA_GET_IOQUEUE &&
				cmd != MOXA_GETMSTATUS)
			return -EINVAL;
	} else if (!ch)
		return -ENODEV;

	switch (cmd) {
	case MOXA_GETDATACOUNT:
		moxaLog.tick = jiffies;
		if (copy_to_user(argp, &moxaLog, sizeof(moxaLog)))
			ret = -EFAULT;
		break;
	case MOXA_FLUSH_QUEUE:
		MoxaPortFlushData(ch, arg);
		break;
	case MOXA_GET_IOQUEUE: {
		struct moxaq_str __user *argm = argp;
		struct moxaq_str tmp;
		struct moxa_port *p;
		unsigned int i, j;

		mutex_lock(&moxa_openlock);
		for (i = 0; i < MAX_BOARDS; i++) {
			p = moxa_boards[i].ports;
			for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
				memset(&tmp, 0, sizeof(tmp));
				if (moxa_boards[i].ready) {
					tmp.inq = MoxaPortRxQueue(p);
					tmp.outq = MoxaPortTxQueue(p);
				}
				if (copy_to_user(argm, &tmp, sizeof(tmp))) {
					mutex_unlock(&moxa_openlock);
					return -EFAULT;
				}
			}
		}
		mutex_unlock(&moxa_openlock);
		break;
	} case MOXA_GET_OQUEUE:
		status = MoxaPortTxQueue(ch);
		ret = put_user(status, (unsigned long __user *)argp);
		break;
	case MOXA_GET_IQUEUE:
		status = MoxaPortRxQueue(ch);
		ret = put_user(status, (unsigned long __user *)argp);
		break;
	case MOXA_GETMSTATUS: {
		struct mxser_mstatus __user *argm = argp;
		struct mxser_mstatus tmp;
		struct moxa_port *p;
		unsigned int i, j;

		mutex_lock(&moxa_openlock);
		for (i = 0; i < MAX_BOARDS; i++) {
			p = moxa_boards[i].ports;
			for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
				struct tty_struct *ttyp;
				memset(&tmp, 0, sizeof(tmp));
				if (!moxa_boards[i].ready)
					goto copy;

				status = MoxaPortLineStatus(p);
				if (status & 1)
					tmp.cts = 1;
				if (status & 2)
					tmp.dsr = 1;
				if (status & 4)
					tmp.dcd = 1;

				ttyp = tty_port_tty_get(&p->port);
				if (!ttyp || !ttyp->termios)
					tmp.cflag = p->cflag;
				else
					tmp.cflag = ttyp->termios->c_cflag;
				tty_kref_put(tty);
copy:
				if (copy_to_user(argm, &tmp, sizeof(tmp))) {
					mutex_unlock(&moxa_openlock);
					return -EFAULT;
				}
			}
		}
		mutex_unlock(&moxa_openlock);
		break;
	}
	case TIOCGSERIAL:
		mutex_lock(&moxa_openlock);
		ret = moxa_get_serial_info(ch, argp);
		mutex_unlock(&moxa_openlock);
		break;
	case TIOCSSERIAL:
		mutex_lock(&moxa_openlock);
		ret = moxa_set_serial_info(ch, argp);
		mutex_unlock(&moxa_openlock);
		break;
	default:
		ret = -ENOIOCTLCMD;
	}
	return ret;
}

static int moxa_break_ctl(struct tty_struct *tty, int state)
{
	struct moxa_port *port = tty->driver_data;

	moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak,
			Magic_code);
	return 0;
}

static const struct tty_operations moxa_ops = {
	.open = moxa_open,
	.close = moxa_close,
	.write = moxa_write,
	.write_room = moxa_write_room,
	.flush_buffer = moxa_flush_buffer,
	.chars_in_buffer = moxa_chars_in_buffer,
	.ioctl = moxa_ioctl,
	.throttle = moxa_throttle,
	.unthrottle = moxa_unthrottle,
	.set_termios = moxa_set_termios,
	.stop = moxa_stop,
	.start = moxa_start,
	.hangup = moxa_hangup,
	.break_ctl = moxa_break_ctl,
	.tiocmget = moxa_tiocmget,
	.tiocmset = moxa_tiocmset,
};

static const struct tty_port_operations moxa_port_ops = {
	.carrier_raised = moxa_carrier_raised,
};

static struct tty_driver *moxaDriver;
static DEFINE_TIMER(moxaTimer, moxa_poll, 0, 0);
static DEFINE_SPINLOCK(moxa_lock);

/*
 * HW init
 */

static int moxa_check_fw_model(struct moxa_board_conf *brd, u8 model)
{
	switch (brd->boardType) {
	case MOXA_BOARD_C218_ISA:
	case MOXA_BOARD_C218_PCI:
		if (model != 1)
			goto err;
		break;
	case MOXA_BOARD_CP204J:
		if (model != 3)
			goto err;
		break;
	default:
		if (model != 2)
			goto err;
		break;
	}
	return 0;
err:
	return -EINVAL;
}

static int moxa_check_fw(const void *ptr)
{
	const __le16 *lptr = ptr;

	if (*lptr != cpu_to_le16(0x7980))
		return -EINVAL;

	return 0;
}

static int moxa_load_bios(struct moxa_board_conf *brd, const u8 *buf,
		size_t len)
{
	void __iomem *baseAddr = brd->basemem;
	u16 tmp;

	writeb(HW_reset, baseAddr + Control_reg);	/* reset */
	msleep(10);
	memset_io(baseAddr, 0, 4096);
	memcpy_toio(baseAddr, buf, len);	/* download BIOS */
	writeb(0, baseAddr + Control_reg);	/* restart */

	msleep(2000);

	switch (brd->boardType) {
	case MOXA_BOARD_C218_ISA:
	case MOXA_BOARD_C218_PCI:
		tmp = readw(baseAddr + C218_key);
		if (tmp != C218_KeyCode)
			goto err;
		break;
	case MOXA_BOARD_CP204J:
		tmp = readw(baseAddr + C218_key);
		if (tmp != CP204J_KeyCode)
			goto err;
		break;
	default:
		tmp = readw(baseAddr + C320_key);
		if (tmp != C320_KeyCode)
			goto err;
		tmp = readw(baseAddr + C320_status);
		if (tmp != STS_init) {
			printk(KERN_ERR "MOXA: bios upload failed -- CPU/Basic "
					"module not found\n");
			return -EIO;
		}
		break;
	}

	return 0;
err:
	printk(KERN_ERR "MOXA: bios upload failed -- board not found\n");
	return -EIO;
}

static int moxa_load_320b(struct moxa_board_conf *brd, const u8 *ptr,
		size_t len)
{
	void __iomem *baseAddr = brd->basemem;

	if (len < 7168) {
		printk(KERN_ERR "MOXA: invalid 320 bios -- too short\n");
		return -EINVAL;
	}

	writew(len - 7168 - 2, baseAddr + C320bapi_len);
	writeb(1, baseAddr + Control_reg);	/* Select Page 1 */
	memcpy_toio(baseAddr + DynPage_addr, ptr, 7168);
	writeb(2, baseAddr + Control_reg);	/* Select Page 2 */
	memcpy_toio(baseAddr + DynPage_addr, ptr + 7168, len - 7168);

	return 0;
}

static int moxa_real_load_code(struct moxa_board_conf *brd, const void *ptr,
		size_t len)
{
	void __iomem *baseAddr = brd->basemem;
	const __le16 *uptr = ptr;
	size_t wlen, len2, j;
	unsigned long key, loadbuf, loadlen, checksum, checksum_ok;
	unsigned int i, retry;
	u16 usum, keycode;

	keycode = (brd->boardType == MOXA_BOARD_CP204J) ? CP204J_KeyCode :
				C218_KeyCode;

	switch (brd->boardType) {
	case MOXA_BOARD_CP204J:
	case MOXA_BOARD_C218_ISA:
	case MOXA_BOARD_C218_PCI:
		key = C218_key;
		loadbuf = C218_LoadBuf;
		loadlen = C218DLoad_len;
		checksum = C218check_sum;
		checksum_ok = C218chksum_ok;
		break;
	default:
		key = C320_key;
		keycode = C320_KeyCode;
		loadbuf = C320_LoadBuf;
		loadlen = C320DLoad_len;
		checksum = C320check_sum;
		checksum_ok = C320chksum_ok;
		break;
	}

	usum = 0;
	wlen = len >> 1;
	for (i = 0; i < wlen; i++)
		usum += le16_to_cpu(uptr[i]);
	retry = 0;
	do {
		wlen = len >> 1;
		j = 0;
		while (wlen) {
			len2 = (wlen > 2048) ? 2048 : wlen;
			wlen -= len2;
			memcpy_toio(baseAddr + loadbuf, ptr + j, len2 << 1);
			j += len2 << 1;

			writew(len2, baseAddr + loadlen);
			writew(0, baseAddr + key);
			for (i = 0; i < 100; i++) {
				if (readw(baseAddr + key) == keycode)
					break;
				msleep(10);
			}
			if (readw(baseAddr + key) != keycode)
				return -EIO;
		}
		writew(0, baseAddr + loadlen);
		writew(usum, baseAddr + checksum);
		writew(0, baseAddr + key);
		for (i = 0; i < 100; i++) {
			if (readw(baseAddr + key) == keycode)
				break;
			msleep(10);
		}
		retry++;
	} while ((readb(baseAddr + checksum_ok) != 1) && (retry < 3));
	if (readb(baseAddr + checksum_ok) != 1)
		return -EIO;

	writew(0, baseAddr + key);
	for (i = 0; i < 600; i++) {
		if (readw(baseAddr + Magic_no) == Magic_code)
			break;
		msleep(10);
	}
	if (readw(baseAddr + Magic_no) != Magic_code)
		return -EIO;

	if (MOXA_IS_320(brd)) {
		if (brd->busType == MOXA_BUS_TYPE_PCI) {	/* ASIC board */
			writew(0x3800, baseAddr + TMS320_PORT1);
			writew(0x3900, baseAddr + TMS320_PORT2);
			writew(28499, baseAddr + TMS320_CLOCK);
		} else {
			writew(0x3200, baseAddr + TMS320_PORT1);
			writew(0x3400, baseAddr + TMS320_PORT2);
			writew(19999, baseAddr + TMS320_CLOCK);
		}
	}
	writew(1, baseAddr + Disable_IRQ);
	writew(0, baseAddr + Magic_no);
	for (i = 0; i < 500; i++) {
		if (readw(baseAddr + Magic_no) == Magic_code)
			break;
		msleep(10);
	}
	if (readw(baseAddr + Magic_no) != Magic_code)
		return -EIO;

	if (MOXA_IS_320(brd)) {
		j = readw(baseAddr + Module_cnt);
		if (j <= 0)
			return -EIO;
		brd->numPorts = j * 8;
		writew(j, baseAddr + Module_no);
		writew(0, baseAddr + Magic_no);
		for (i = 0; i < 600; i++) {
			if (readw(baseAddr + Magic_no) == Magic_code)
				break;
			msleep(10);
		}
		if (readw(baseAddr + Magic_no) != Magic_code)
			return -EIO;
	}
	brd->intNdx = baseAddr + IRQindex;
	brd->intPend = baseAddr + IRQpending;
	brd->intTable = baseAddr + IRQtable;

	return 0;
}

static int moxa_load_code(struct moxa_board_conf *brd, const void *ptr,
		size_t len)
{
	void __iomem *ofsAddr, *baseAddr = brd->basemem;
	struct moxa_port *port;
	int retval, i;

	if (len % 2) {
		printk(KERN_ERR "MOXA: bios length is not even\n");
		return -EINVAL;
	}

	retval = moxa_real_load_code(brd, ptr, len); /* may change numPorts */
	if (retval)
		return retval;

	switch (brd->boardType) {
	case MOXA_BOARD_C218_ISA:
	case MOXA_BOARD_C218_PCI:
	case MOXA_BOARD_CP204J:
		port = brd->ports;
		for (i = 0; i < brd->numPorts; i++, port++) {
			port->board = brd;
			port->DCDState = 0;
			port->tableAddr = baseAddr + Extern_table +
					Extern_size * i;
			ofsAddr = port->tableAddr;
			writew(C218rx_mask, ofsAddr + RX_mask);
			writew(C218tx_mask, ofsAddr + TX_mask);
			writew(C218rx_spage + i * C218buf_pageno, ofsAddr + Page_rxb);
			writew(readw(ofsAddr + Page_rxb) + C218rx_pageno, ofsAddr + EndPage_rxb);

			writew(C218tx_spage + i * C218buf_pageno, ofsAddr + Page_txb);
			writew(readw(ofsAddr + Page_txb) + C218tx_pageno, ofsAddr + EndPage_txb);

		}
		break;
	default:
		port = brd->ports;
		for (i = 0; i < brd->numPorts; i++, port++) {
			port->board = brd;
			port->DCDState = 0;
			port->tableAddr = baseAddr + Extern_table +
					Extern_size * i;
			ofsAddr = port->tableAddr;
			switch (brd->numPorts) {
			case 8:
				writew(C320p8rx_mask, ofsAddr + RX_mask);
				writew(C320p8tx_mask, ofsAddr + TX_mask);
				writew(C320p8rx_spage + i * C320p8buf_pgno, ofsAddr + Page_rxb);
				writew(readw(ofsAddr + Page_rxb) + C320p8rx_pgno, ofsAddr + EndPage_rxb);
				writew(C320p8tx_spage + i * C320p8buf_pgno, ofsAddr + Page_txb);
				writew(readw(ofsAddr + Page_txb) + C320p8tx_pgno, ofsAddr + EndPage_txb);

				break;
			case 16:
				writew(C320p16rx_mask, ofsAddr + RX_mask);
				writew(C320p16tx_mask, ofsAddr + TX_mask);
				writew(C320p16rx_spage + i * C320p16buf_pgno, ofsAddr + Page_rxb);
				writew(readw(ofsAddr + Page_rxb) + C320p16rx_pgno, ofsAddr + EndPage_rxb);
				writew(C320p16tx_spage + i * C320p16buf_pgno, ofsAddr + Page_txb);
				writew(readw(ofsAddr + Page_txb) + C320p16tx_pgno, ofsAddr + EndPage_txb);
				break;

			case 24:
				writew(C320p24rx_mask, ofsAddr + RX_mask);
				writew(C320p24tx_mask, ofsAddr + TX_mask);
				writew(C320p24rx_spage + i * C320p24buf_pgno, ofsAddr + Page_rxb);
				writew(readw(ofsAddr + Page_rxb) + C320p24rx_pgno, ofsAddr + EndPage_rxb);
				writew(C320p24tx_spage + i * C320p24buf_pgno, ofsAddr + Page_txb);
				writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
				break;
			case 32:
				writew(C320p32rx_mask, ofsAddr + RX_mask);
				writew(C320p32tx_mask, ofsAddr + TX_mask);
				writew(C320p32tx_ofs, ofsAddr + Ofs_txb);
				writew(C320p32rx_spage + i * C320p32buf_pgno, ofsAddr + Page_rxb);
				writew(readb(ofsAddr + Page_rxb), ofsAddr + EndPage_rxb);
				writew(C320p32tx_spage + i * C320p32buf_pgno, ofsAddr + Page_txb);
				writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
				break;
			}
		}
		break;
	}
	return 0;
}

static int moxa_load_fw(struct moxa_board_conf *brd, const struct firmware *fw)
{
	const void *ptr = fw->data;
	char rsn[64];
	u16 lens[5];
	size_t len;
	unsigned int a, lenp, lencnt;
	int ret = -EINVAL;
	struct {
		__le32 magic;	/* 0x34303430 */
		u8 reserved1[2];
		u8 type;	/* UNIX = 3 */
		u8 model;	/* C218T=1, C320T=2, CP204=3 */
		u8 reserved2[8];
		__le16 len[5];
	} const *hdr = ptr;

	BUILD_BUG_ON(ARRAY_SIZE(hdr->len) != ARRAY_SIZE(lens));

	if (fw->size < MOXA_FW_HDRLEN) {
		strcpy(rsn, "too short (even header won't fit)");
		goto err;
	}
	if (hdr->magic != cpu_to_le32(0x30343034)) {
		sprintf(rsn, "bad magic: %.8x", le32_to_cpu(hdr->magic));
		goto err;
	}
	if (hdr->type != 3) {
		sprintf(rsn, "not for linux, type is %u", hdr->type);
		goto err;
	}
	if (moxa_check_fw_model(brd, hdr->model)) {
		sprintf(rsn, "not for this card, model is %u", hdr->model);
		goto err;
	}

	len = MOXA_FW_HDRLEN;
	lencnt = hdr->model == 2 ? 5 : 3;
	for (a = 0; a < ARRAY_SIZE(lens); a++) {
		lens[a] = le16_to_cpu(hdr->len[a]);
		if (lens[a] && len + lens[a] <= fw->size &&
				moxa_check_fw(&fw->data[len]))
			printk(KERN_WARNING "MOXA firmware: unexpected input "
				"at offset %u, but going on\n", (u32)len);
		if (!lens[a] && a < lencnt) {
			sprintf(rsn, "too few entries in fw file");
			goto err;
		}
		len += lens[a];
	}

	if (len != fw->size) {
		sprintf(rsn, "bad length: %u (should be %u)", (u32)fw->size,
				(u32)len);
		goto err;
	}

	ptr += MOXA_FW_HDRLEN;
	lenp = 0; /* bios */

	strcpy(rsn, "read above");

	ret = moxa_load_bios(brd, ptr, lens[lenp]);
	if (ret)
		goto err;

	/* we skip the tty section (lens[1]), since we don't need it */
	ptr += lens[lenp] + lens[lenp + 1];
	lenp += 2; /* comm */

	if (hdr->model == 2) {
		ret = moxa_load_320b(brd, ptr, lens[lenp]);
		if (ret)
			goto err;
		/* skip another tty */
		ptr += lens[lenp] + lens[lenp + 1];
		lenp += 2;
	}

	ret = moxa_load_code(brd, ptr, lens[lenp]);
	if (ret)
		goto err;

	return 0;
err:
	printk(KERN_ERR "firmware failed to load, reason: %s\n", rsn);
	return ret;
}

static int moxa_init_board(struct moxa_board_conf *brd, struct device *dev)
{
	const struct firmware *fw;
	const char *file;
	struct moxa_port *p;
	unsigned int i;
	int ret;

	brd->ports = kcalloc(MAX_PORTS_PER_BOARD, sizeof(*brd->ports),
			GFP_KERNEL);
	if (brd->ports == NULL) {
		printk(KERN_ERR "cannot allocate memory for ports\n");
		ret = -ENOMEM;
		goto err;
	}

	for (i = 0, p = brd->ports; i < MAX_PORTS_PER_BOARD; i++, p++) {
		tty_port_init(&p->port);
		p->port.ops = &moxa_port_ops;
		p->type = PORT_16550A;
		p->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
	}

	switch (brd->boardType) {
	case MOXA_BOARD_C218_ISA:
	case MOXA_BOARD_C218_PCI:
		file = "c218tunx.cod";
		break;
	case MOXA_BOARD_CP204J:
		file = "cp204unx.cod";
		break;
	default:
		file = "c320tunx.cod";
		break;
	}

	ret = request_firmware(&fw, file, dev);
	if (ret) {
		printk(KERN_ERR "MOXA: request_firmware failed. Make sure "
				"you've placed '%s' file into your firmware "
				"loader directory (e.g. /lib/firmware)\n",
				file);
		goto err_free;
	}

	ret = moxa_load_fw(brd, fw);

	release_firmware(fw);

	if (ret)
		goto err_free;

	spin_lock_bh(&moxa_lock);
	brd->ready = 1;
	if (!timer_pending(&moxaTimer))
		mod_timer(&moxaTimer, jiffies + HZ / 50);
	spin_unlock_bh(&moxa_lock);

	return 0;
err_free:
	kfree(brd->ports);
err:
	return ret;
}

static void moxa_board_deinit(struct moxa_board_conf *brd)
{
	unsigned int a, opened;

	mutex_lock(&moxa_openlock);
	spin_lock_bh(&moxa_lock);
	brd->ready = 0;
	spin_unlock_bh(&moxa_lock);

	/* pci hot-un-plug support */
	for (a = 0; a < brd->numPorts; a++)
		if (brd->ports[a].port.flags & ASYNC_INITIALIZED) {
			struct tty_struct *tty = tty_port_tty_get(
						&brd->ports[a].port);
			if (tty) {
				tty_hangup(tty);
				tty_kref_put(tty);
			}
		}
	while (1) {
		opened = 0;
		for (a = 0; a < brd->numPorts; a++)
			if (brd->ports[a].port.flags & ASYNC_INITIALIZED)
				opened++;
		mutex_unlock(&moxa_openlock);
		if (!opened)
			break;
		msleep(50);
		mutex_lock(&moxa_openlock);
	}

	iounmap(brd->basemem);
	brd->basemem = NULL;
	kfree(brd->ports);
}

#ifdef CONFIG_PCI
static int __devinit moxa_pci_probe(struct pci_dev *pdev,
		const struct pci_device_id *ent)
{
	struct moxa_board_conf *board;
	unsigned int i;
	int board_type = ent->driver_data;
	int retval;

	retval = pci_enable_device(pdev);
	if (retval) {
		dev_err(&pdev->dev, "can't enable pci device\n");
		goto err;
	}

	for (i = 0; i < MAX_BOARDS; i++)
		if (moxa_boards[i].basemem == NULL)
			break;

	retval = -ENODEV;
	if (i >= MAX_BOARDS) {
		dev_warn(&pdev->dev, "more than %u MOXA Intellio family boards "
				"found. Board is ignored.\n", MAX_BOARDS);
		goto err;
	}

	board = &moxa_boards[i];

	retval = pci_request_region(pdev, 2, "moxa-base");
	if (retval) {
		dev_err(&pdev->dev, "can't request pci region 2\n");
		goto err;
	}

	board->basemem = ioremap_nocache(pci_resource_start(pdev, 2), 0x4000);
	if (board->basemem == NULL) {
		dev_err(&pdev->dev, "can't remap io space 2\n");
		goto err_reg;
	}

	board->boardType = board_type;
	switch (board_type) {
	case MOXA_BOARD_C218_ISA:
	case MOXA_BOARD_C218_PCI:
		board->numPorts = 8;
		break;

	case MOXA_BOARD_CP204J:
		board->numPorts = 4;
		break;
	default:
		board->numPorts = 0;
		break;
	}
	board->busType = MOXA_BUS_TYPE_PCI;

	retval = moxa_init_board(board, &pdev->dev);
	if (retval)
		goto err_base;

	pci_set_drvdata(pdev, board);

	dev_info(&pdev->dev, "board '%s' ready (%u ports, firmware loaded)\n",
			moxa_brdname[board_type - 1], board->numPorts);

	return 0;
err_base:
	iounmap(board->basemem);
	board->basemem = NULL;
err_reg:
	pci_release_region(pdev, 2);
err:
	return retval;
}

static void __devexit moxa_pci_remove(struct pci_dev *pdev)
{
	struct moxa_board_conf *brd = pci_get_drvdata(pdev);

	moxa_board_deinit(brd);

	pci_release_region(pdev, 2);
}

static struct pci_driver moxa_pci_driver = {
	.name = "moxa",
	.id_table = moxa_pcibrds,
	.probe = moxa_pci_probe,
	.remove = __devexit_p(moxa_pci_remove)
};
#endif /* CONFIG_PCI */

static int __init moxa_init(void)
{
	unsigned int isabrds = 0;
	int retval = 0;

	printk(KERN_INFO "MOXA Intellio family driver version %s\n",
			MOXA_VERSION);
	moxaDriver = alloc_tty_driver(MAX_PORTS + 1);
	if (!moxaDriver)
		return -ENOMEM;

	moxaDriver->owner = THIS_MODULE;
	moxaDriver->name = "ttyMX";
	moxaDriver->major = ttymajor;
	moxaDriver->minor_start = 0;
	moxaDriver->type = TTY_DRIVER_TYPE_SERIAL;
	moxaDriver->subtype = SERIAL_TYPE_NORMAL;
	moxaDriver->init_termios = tty_std_termios;
	moxaDriver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
	moxaDriver->init_termios.c_ispeed = 9600;
	moxaDriver->init_termios.c_ospeed = 9600;
	moxaDriver->flags = TTY_DRIVER_REAL_RAW;
	tty_set_operations(moxaDriver, &moxa_ops);

	if (tty_register_driver(moxaDriver)) {
		printk(KERN_ERR "can't register MOXA Smartio tty driver!\n");
		put_tty_driver(moxaDriver);
		return -1;
	}

	/* Find the boards defined from module args. */
#ifdef MODULE
	{
	struct moxa_board_conf *brd = moxa_boards;
	unsigned int i;
	for (i = 0; i < MAX_BOARDS; i++) {
		if (!baseaddr[i])
			break;
		if (type[i] == MOXA_BOARD_C218_ISA ||
				type[i] == MOXA_BOARD_C320_ISA) {
			pr_debug("Moxa board %2d: %s board(baseAddr=%lx)\n",
					isabrds + 1, moxa_brdname[type[i] - 1],
					baseaddr[i]);
			brd->boardType = type[i];
			brd->numPorts = type[i] == MOXA_BOARD_C218_ISA ? 8 :
					numports[i];
			brd->busType = MOXA_BUS_TYPE_ISA;
			brd->basemem = ioremap_nocache(baseaddr[i], 0x4000);
			if (!brd->basemem) {
				printk(KERN_ERR "MOXA: can't remap %lx\n",
						baseaddr[i]);
				continue;
			}
			if (moxa_init_board(brd, NULL)) {
				iounmap(brd->basemem);
				brd->basemem = NULL;
				continue;
			}

			printk(KERN_INFO "MOXA isa board found at 0x%.8lu and "
					"ready (%u ports, firmware loaded)\n",
					baseaddr[i], brd->numPorts);

			brd++;
			isabrds++;
		}
	}
	}
#endif

#ifdef CONFIG_PCI
	retval = pci_register_driver(&moxa_pci_driver);
	if (retval) {
		printk(KERN_ERR "Can't register MOXA pci driver!\n");
		if (isabrds)
			retval = 0;
	}
#endif

	return retval;
}

static void __exit moxa_exit(void)
{
	unsigned int i;

#ifdef CONFIG_PCI
	pci_unregister_driver(&moxa_pci_driver);
#endif

	for (i = 0; i < MAX_BOARDS; i++) /* ISA boards */
		if (moxa_boards[i].ready)
			moxa_board_deinit(&moxa_boards[i]);

	del_timer_sync(&moxaTimer);

	if (tty_unregister_driver(moxaDriver))
		printk(KERN_ERR "Couldn't unregister MOXA Intellio family "
				"serial driver\n");
	put_tty_driver(moxaDriver);
}

module_init(moxa_init);
module_exit(moxa_exit);

static void moxa_close_port(struct tty_struct *tty)
{
	struct moxa_port *ch = tty->driver_data;
	moxa_shut_down(tty);
	MoxaPortFlushData(ch, 2);
	ch->port.flags &= ~ASYNC_NORMAL_ACTIVE;
	tty->driver_data = NULL;
	tty_port_tty_set(&ch->port, NULL);
}

static int moxa_carrier_raised(struct tty_port *port)
{
	struct moxa_port *ch = container_of(port, struct moxa_port, port);
	int dcd;

	spin_lock_bh(&moxa_lock);
	dcd = ch->DCDState;
	spin_unlock_bh(&moxa_lock);
	return dcd;
}

static int moxa_block_till_ready(struct tty_struct *tty, struct file *filp,
			    struct moxa_port *ch)
{
	struct tty_port *port = &ch->port;
	DEFINE_WAIT(wait);
	int retval = 0;
	u8 dcd;

	while (1) {
		prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE);
		if (tty_hung_up_p(filp)) {
#ifdef SERIAL_DO_RESTART
			retval = -ERESTARTSYS;
#else
			retval = -EAGAIN;
#endif
			break;
		}
		dcd = tty_port_carrier_raised(port);
		if (dcd)
			break;

		if (signal_pending(current)) {
			retval = -ERESTARTSYS;
			break;
		}
		schedule();
	}
	finish_wait(&port->open_wait, &wait);

	return retval;
}

static int moxa_open(struct tty_struct *tty, struct file *filp)
{
	struct moxa_board_conf *brd;
	struct moxa_port *ch;
	int port;
	int retval;

	port = tty->index;
	if (port == MAX_PORTS) {
		return capable(CAP_SYS_ADMIN) ? 0 : -EPERM;
	}
	if (mutex_lock_interruptible(&moxa_openlock))
		return -ERESTARTSYS;
	brd = &moxa_boards[port / MAX_PORTS_PER_BOARD];
	if (!brd->ready) {
		mutex_unlock(&moxa_openlock);
		return -ENODEV;
	}

	if (port % MAX_PORTS_PER_BOARD >= brd->numPorts) {
		mutex_unlock(&moxa_openlock);
		return -ENODEV;
	}

	if (port % MAX_PORTS_PER_BOARD >= brd->numPorts) {
		retval = -ENODEV;
		goto out_unlock;
	}

	ch = &brd->ports[port % MAX_PORTS_PER_BOARD];
	ch->port.count++;
	tty->driver_data = ch;
	tty_port_tty_set(&ch->port, tty);
	if (!(ch->port.flags & ASYNC_INITIALIZED)) {
		ch->statusflags = 0;
		moxa_set_tty_param(tty, tty->termios);
		MoxaPortLineCtrl(ch, 1, 1);
		MoxaPortEnable(ch);
		MoxaSetFifo(ch, ch->type == PORT_16550A);
		ch->port.flags |= ASYNC_INITIALIZED;
	}
	mutex_unlock(&moxa_openlock);

	retval = 0;
	if (!(filp->f_flags & O_NONBLOCK) && !C_CLOCAL(tty))
		retval = moxa_block_till_ready(tty, filp, ch);
	mutex_lock(&moxa_openlock);
	if (retval) {
		if (ch->port.count) /* 0 means already hung up... */
			if (--ch->port.count == 0)
				moxa_close_port(tty);
	} else
		ch->port.flags |= ASYNC_NORMAL_ACTIVE;
out_unlock:
	mutex_unlock(&moxa_openlock);
	return retval;
}

static void moxa_close(struct tty_struct *tty, struct file *filp)
{
	struct moxa_port *ch;
	int port;

	port = tty->index;
	if (port == MAX_PORTS || tty_hung_up_p(filp))
		return;

	mutex_lock(&moxa_openlock);
	ch = tty->driver_data;
	if (ch == NULL)
		goto unlock;
	if (tty->count == 1 && ch->port.count != 1) {
		printk(KERN_WARNING "moxa_close: bad serial port count; "
			"tty->count is 1, ch->port.count is %d\n", ch->port.count);
		ch->port.count = 1;
	}
	if (--ch->port.count < 0) {
		printk(KERN_WARNING "moxa_close: bad serial port count, "
			"device=%s\n", tty->name);
		ch->port.count = 0;
	}
	if (ch->port.count)
		goto unlock;

	ch->cflag = tty->termios->c_cflag;
	if (ch->port.flags & ASYNC_INITIALIZED) {
		moxa_setup_empty_event(tty);
		tty_wait_until_sent(tty, 30 * HZ);	/* 30 seconds timeout */
	}

	moxa_close_port(tty);
unlock:
	mutex_unlock(&moxa_openlock);
}

static int moxa_write(struct tty_struct *tty,
		      const unsigned char *buf, int count)
{
	struct moxa_port *ch = tty->driver_data;
	int len;

	if (ch == NULL)
		return 0;

	spin_lock_bh(&moxa_lock);
	len = MoxaPortWriteData(tty, buf, count);
	spin_unlock_bh(&moxa_lock);

	ch->statusflags |= LOWWAIT;
	return len;
}

static int moxa_write_room(struct tty_struct *tty)
{
	struct moxa_port *ch;

	if (tty->stopped)
		return 0;
	ch = tty->driver_data;
	if (ch == NULL)
		return 0;
	return MoxaPortTxFree(ch);
}

static void moxa_flush_buffer(struct tty_struct *tty)
{
	struct moxa_port *ch = tty->driver_data;

	if (ch == NULL)
		return;
	MoxaPortFlushData(ch, 1);
	tty_wakeup(tty);
}

static int moxa_chars_in_buffer(struct tty_struct *tty)
{
	struct moxa_port *ch = tty->driver_data;
	int chars;

	/*
	 * Sigh...I have to check if driver_data is NULL here, because
	 * if an open() fails, the TTY subsystem eventually calls
	 * tty_wait_until_sent(), which calls the driver's chars_in_buffer()
	 * routine.  And since the open() failed, we return 0 here.  TDJ
	 */
	if (ch == NULL)
		return 0;
	lock_kernel();
	chars = MoxaPortTxQueue(ch);
	if (chars) {
		/*
		 * Make it possible to wakeup anything waiting for output
		 * in tty_ioctl.c, etc.
		 */
		if (!(ch->statusflags & EMPTYWAIT))
			moxa_setup_empty_event(tty);
	}
	unlock_kernel();
	return chars;
}

static int moxa_tiocmget(struct tty_struct *tty, struct file *file)
{
	struct moxa_port *ch;
	int flag = 0, dtr, rts;

	mutex_lock(&moxa_openlock);
	ch = tty->driver_data;
	if (!ch) {
		mutex_unlock(&moxa_openlock);
		return -EINVAL;
	}

	MoxaPortGetLineOut(ch, &dtr, &rts);
	if (dtr)
		flag |= TIOCM_DTR;
	if (rts)
		flag |= TIOCM_RTS;
	dtr = MoxaPortLineStatus(ch);
	if (dtr & 1)
		flag |= TIOCM_CTS;
	if (dtr & 2)
		flag |= TIOCM_DSR;
	if (dtr & 4)
		flag |= TIOCM_CD;
	mutex_unlock(&moxa_openlock);
	return flag;
}

static int moxa_tiocmset(struct tty_struct *tty, struct file *file,
			 unsigned int set, unsigned int clear)
{
	struct moxa_port *ch;
	int port;
	int dtr, rts;

	port = tty->index;
	mutex_lock(&moxa_openlock);
	ch = tty->driver_data;
	if (!ch) {
		mutex_unlock(&moxa_openlock);
		return -EINVAL;
	}

	MoxaPortGetLineOut(ch, &dtr, &rts);
	if (set & TIOCM_RTS)
		rts = 1;
	if (set & TIOCM_DTR)
		dtr = 1;
	if (clear & TIOCM_RTS)
		rts = 0;
	if (clear & TIOCM_DTR)
		dtr = 0;
	MoxaPortLineCtrl(ch, dtr, rts);
	mutex_unlock(&moxa_openlock);
	return 0;
}

static void moxa_throttle(struct tty_struct *tty)
{
	struct moxa_port *ch = tty->driver_data;

	ch->statusflags |= THROTTLE;
}

static void moxa_unthrottle(struct tty_struct *tty)
{
	struct moxa_port *ch = tty->driver_data;

	ch->statusflags &= ~THROTTLE;
}

static void moxa_set_termios(struct tty_struct *tty,
		struct ktermios *old_termios)
{
	struct moxa_port *ch = tty->driver_data;

	if (ch == NULL)
		return;
	moxa_set_tty_param(tty, old_termios);
	if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
		wake_up_interruptible(&ch->port.open_wait);
}

static void moxa_stop(struct tty_struct *tty)
{
	struct moxa_port *ch = tty->driver_data;

	if (ch == NULL)
		return;
	MoxaPortTxDisable(ch);
	ch->statusflags |= TXSTOPPED;
}


static void moxa_start(struct tty_struct *tty)
{
	struct moxa_port *ch = tty->driver_data;

	if (ch == NULL)
		return;

	if (!(ch->statusflags & TXSTOPPED))
		return;

	MoxaPortTxEnable(ch);
	ch->statusflags &= ~TXSTOPPED;
}

static void moxa_hangup(struct tty_struct *tty)
{
	struct moxa_port *ch;

	mutex_lock(&moxa_openlock);
	ch = tty->driver_data;
	if (ch == NULL) {
		mutex_unlock(&moxa_openlock);
		return;
	}
	ch->port.count = 0;
	moxa_close_port(tty);
	mutex_unlock(&moxa_openlock);

	wake_up_interruptible(&ch->port.open_wait);
}

static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd)
{
	struct tty_struct *tty;
	dcd = !!dcd;

	if (dcd != p->DCDState) {
		tty = tty_port_tty_get(&p->port);
		if (tty && C_CLOCAL(tty) && !dcd)
			tty_hangup(tty);
		tty_kref_put(tty);
	}
	p->DCDState = dcd;
}

static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
		u16 __iomem *ip)
{
	struct tty_struct *tty = tty_port_tty_get(&p->port);
	void __iomem *ofsAddr;
	unsigned int inited = p->port.flags & ASYNC_INITIALIZED;
	u16 intr;

	if (tty) {
		if ((p->statusflags & EMPTYWAIT) &&
				MoxaPortTxQueue(p) == 0) {
			p->statusflags &= ~EMPTYWAIT;
			tty_wakeup(tty);
		}
		if ((p->statusflags & LOWWAIT) && !tty->stopped &&
				MoxaPortTxQueue(p) <= WAKEUP_CHARS) {
			p->statusflags &= ~LOWWAIT;
			tty_wakeup(tty);
		}

		if (inited && !(p->statusflags & THROTTLE) &&
				MoxaPortRxQueue(p) > 0) { /* RX */
			MoxaPortReadData(p);
			tty_schedule_flip(tty);
		}
	} else {
		p->statusflags &= ~EMPTYWAIT;
		MoxaPortFlushData(p, 0); /* flush RX */
	}

	if (!handle) /* nothing else to do */
		goto put;

	intr = readw(ip); /* port irq status */
	if (intr == 0)
		goto put;

	writew(0, ip); /* ACK port */
	ofsAddr = p->tableAddr;
	if (intr & IntrTx) /* disable tx intr */
		writew(readw(ofsAddr + HostStat) & ~WakeupTx,
				ofsAddr + HostStat);

	if (!inited)
		goto put;

	if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */
		tty_insert_flip_char(tty, 0, TTY_BREAK);
		tty_schedule_flip(tty);
	}

	if (intr & IntrLine)
		moxa_new_dcdstate(p, readb(ofsAddr + FlagStat) & DCD_state);
put:
	tty_kref_put(tty);

	return 0;
}

static void moxa_poll(unsigned long ignored)
{
	struct moxa_board_conf *brd;
	u16 __iomem *ip;
	unsigned int card, port, served = 0;

	spin_lock(&moxa_lock);
	for (card = 0; card < MAX_BOARDS; card++) {
		brd = &moxa_boards[card];
		if (!brd->ready)
			continue;

		served++;

		ip = NULL;
		if (readb(brd->intPend) == 0xff)
			ip = brd->intTable + readb(brd->intNdx);

		for (port = 0; port < brd->numPorts; port++)
			moxa_poll_port(&brd->ports[port], !!ip, ip + port);

		if (ip)
			writeb(0, brd->intPend); /* ACK */

		if (moxaLowWaterChk) {
			struct moxa_port *p = brd->ports;
			for (port = 0; port < brd->numPorts; port++, p++)
				if (p->lowChkFlag) {
					p->lowChkFlag = 0;
					moxa_low_water_check(p->tableAddr);
				}
		}
	}
	moxaLowWaterChk = 0;

	if (served)
		mod_timer(&moxaTimer, jiffies + HZ / 50);
	spin_unlock(&moxa_lock);
}

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

static void moxa_set_tty_param(struct tty_struct *tty, struct ktermios *old_termios)
{
	register struct ktermios *ts = tty->termios;
	struct moxa_port *ch = tty->driver_data;
	int rts, cts, txflow, rxflow, xany, baud;

	rts = cts = txflow = rxflow = xany = 0;
	if (ts->c_cflag & CRTSCTS)
		rts = cts = 1;
	if (ts->c_iflag & IXON)
		txflow = 1;
	if (ts->c_iflag & IXOFF)
		rxflow = 1;
	if (ts->c_iflag & IXANY)
		xany = 1;

	/* Clear the features we don't support */
	ts->c_cflag &= ~CMSPAR;
	MoxaPortFlowCtrl(ch, rts, cts, txflow, rxflow, xany);
	baud = MoxaPortSetTermio(ch, ts, tty_get_baud_rate(tty));
	if (baud == -1)
		baud = tty_termios_baud_rate(old_termios);
	/* Not put the baud rate into the termios data */
	tty_encode_baud_rate(tty, baud, baud);
}

static void moxa_setup_empty_event(struct tty_struct *tty)
{
	struct moxa_port *ch = tty->driver_data;

	spin_lock_bh(&moxa_lock);
	ch->statusflags |= EMPTYWAIT;
	spin_unlock_bh(&moxa_lock);
}

static void moxa_shut_down(struct tty_struct *tty)
{
	struct moxa_port *ch = tty->driver_data;

	if (!(ch->port.flags & ASYNC_INITIALIZED))
		return;

	MoxaPortDisable(ch);

	/*
	 * If we're a modem control device and HUPCL is on, drop RTS & DTR.
	 */
	if (C_HUPCL(tty))
		MoxaPortLineCtrl(ch, 0, 0);

	spin_lock_bh(&moxa_lock);
	ch->port.flags &= ~ASYNC_INITIALIZED;
	spin_unlock_bh(&moxa_lock);
}

/*****************************************************************************
 *	Driver level functions: 					     *
 *****************************************************************************/

static void MoxaPortFlushData(struct moxa_port *port, int mode)
{
	void __iomem *ofsAddr;
	if (mode < 0 || mode > 2)
		return;
	ofsAddr = port->tableAddr;
	moxafunc(ofsAddr, FC_FlushQueue, mode);
	if (mode != 1) {
		port->lowChkFlag = 0;
		moxa_low_water_check(ofsAddr);
	}
}

/*
 *    Moxa Port Number Description:
 *
 *      MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And,
 *      the port number using in MOXA driver functions will be 0 to 31 for
 *      first MOXA board, 32 to 63 for second, 64 to 95 for third and 96
 *      to 127 for fourth. For example, if you setup three MOXA boards,
 *      first board is C218, second board is C320-16 and third board is
 *      C320-32. The port number of first board (C218 - 8 ports) is from
 *      0 to 7. The port number of second board (C320 - 16 ports) is form
 *      32 to 47. The port number of third board (C320 - 32 ports) is from
 *      64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to
 *      127 will be invalid.
 *
 *
 *      Moxa Functions Description:
 *
 *      Function 1:     Driver initialization routine, this routine must be
 *                      called when initialized driver.
 *      Syntax:
 *      void MoxaDriverInit();
 *
 *
 *      Function 2:     Moxa driver private IOCTL command processing.
 *      Syntax:
 *      int  MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port);
 *
 *           unsigned int cmd   : IOCTL command
 *           unsigned long arg  : IOCTL argument
 *           int port           : port number (0 - 127)
 *
 *           return:    0  (OK)
 *                      -EINVAL
 *                      -ENOIOCTLCMD
 *
 *
 *      Function 6:     Enable this port to start Tx/Rx data.
 *      Syntax:
 *      void MoxaPortEnable(int port);
 *           int port           : port number (0 - 127)
 *
 *
 *      Function 7:     Disable this port
 *      Syntax:
 *      void MoxaPortDisable(int port);
 *           int port           : port number (0 - 127)
 *
 *
 *      Function 10:    Setting baud rate of this port.
 *      Syntax:
 *      speed_t MoxaPortSetBaud(int port, speed_t baud);
 *           int port           : port number (0 - 127)
 *           long baud          : baud rate (50 - 115200)
 *
 *           return:    0       : this port is invalid or baud < 50
 *                      50 - 115200 : the real baud rate set to the port, if
 *                                    the argument baud is large than maximun
 *                                    available baud rate, the real setting
 *                                    baud rate will be the maximun baud rate.
 *
 *
 *      Function 12:    Configure the port.
 *      Syntax:
 *      int  MoxaPortSetTermio(int port, struct ktermios *termio, speed_t baud);
 *           int port           : port number (0 - 127)
 *           struct ktermios * termio : termio structure pointer
 *	     speed_t baud	: baud rate
 *
 *           return:    -1      : this port is invalid or termio == NULL
 *                      0       : setting O.K.
 *
 *
 *      Function 13:    Get the DTR/RTS state of this port.
 *      Syntax:
 *      int  MoxaPortGetLineOut(int port, int *dtrState, int *rtsState);
 *           int port           : port number (0 - 127)
 *           int * dtrState     : pointer to INT to receive the current DTR
 *                                state. (if NULL, this function will not
 *                                write to this address)
 *           int * rtsState     : pointer to INT to receive the current RTS
 *                                state. (if NULL, this function will not
 *                                write to this address)
 *
 *           return:    -1      : this port is invalid
 *                      0       : O.K.
 *
 *
 *      Function 14:    Setting the DTR/RTS output state of this port.
 *      Syntax:
 *      void MoxaPortLineCtrl(int port, int dtrState, int rtsState);
 *           int port           : port number (0 - 127)
 *           int dtrState       : DTR output state (0: off, 1: on)
 *           int rtsState       : RTS output state (0: off, 1: on)
 *
 *
 *      Function 15:    Setting the flow control of this port.
 *      Syntax:
 *      void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow,
 *                            int txFlow,int xany);
 *           int port           : port number (0 - 127)
 *           int rtsFlow        : H/W RTS flow control (0: no, 1: yes)
 *           int ctsFlow        : H/W CTS flow control (0: no, 1: yes)
 *           int rxFlow         : S/W Rx XON/XOFF flow control (0: no, 1: yes)
 *           int txFlow         : S/W Tx XON/XOFF flow control (0: no, 1: yes)
 *           int xany           : S/W XANY flow control (0: no, 1: yes)
 *
 *
 *      Function 16:    Get ths line status of this port
 *      Syntax:
 *      int  MoxaPortLineStatus(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    Bit 0 - CTS state (0: off, 1: on)
 *                      Bit 1 - DSR state (0: off, 1: on)
 *                      Bit 2 - DCD state (0: off, 1: on)
 *
 *
 *      Function 19:    Flush the Rx/Tx buffer data of this port.
 *      Syntax:
 *      void MoxaPortFlushData(int port, int mode);
 *           int port           : port number (0 - 127)
 *           int mode    
 *                      0       : flush the Rx buffer 
 *                      1       : flush the Tx buffer 
 *                      2       : flush the Rx and Tx buffer 
 *
 *
 *      Function 20:    Write data.
 *      Syntax:
 *      int  MoxaPortWriteData(int port, unsigned char * buffer, int length);
 *           int port           : port number (0 - 127)
 *           unsigned char * buffer     : pointer to write data buffer.
 *           int length         : write data length
 *
 *           return:    0 - length      : real write data length
 *
 *
 *      Function 21:    Read data.
 *      Syntax:
 *      int  MoxaPortReadData(int port, struct tty_struct *tty);
 *           int port           : port number (0 - 127)
 *	     struct tty_struct *tty : tty for data
 *
 *           return:    0 - length      : real read data length
 *
 *
 *      Function 24:    Get the Tx buffer current queued data bytes
 *      Syntax:
 *      int  MoxaPortTxQueue(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    ..      : Tx buffer current queued data bytes
 *
 *
 *      Function 25:    Get the Tx buffer current free space
 *      Syntax:
 *      int  MoxaPortTxFree(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    ..      : Tx buffer current free space
 *
 *
 *      Function 26:    Get the Rx buffer current queued data bytes
 *      Syntax:
 *      int  MoxaPortRxQueue(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    ..      : Rx buffer current queued data bytes
 *
 *
 *      Function 28:    Disable port data transmission.
 *      Syntax:
 *      void MoxaPortTxDisable(int port);
 *           int port           : port number (0 - 127)
 *
 *
 *      Function 29:    Enable port data transmission.
 *      Syntax:
 *      void MoxaPortTxEnable(int port);
 *           int port           : port number (0 - 127)
 *
 *
 *      Function 31:    Get the received BREAK signal count and reset it.
 *      Syntax:
 *      int  MoxaPortResetBrkCnt(int port);
 *           int port           : port number (0 - 127)
 *
 *           return:    0 - ..  : BREAK signal count
 *
 *
 */

static void MoxaPortEnable(struct moxa_port *port)
{
	void __iomem *ofsAddr;
	u16 lowwater = 512;

	ofsAddr = port->tableAddr;
	writew(lowwater, ofsAddr + Low_water);
	if (MOXA_IS_320(port->board))
		moxafunc(ofsAddr, FC_SetBreakIrq, 0);
	else
		writew(readw(ofsAddr + HostStat) | WakeupBreak,
				ofsAddr + HostStat);

	moxafunc(ofsAddr, FC_SetLineIrq, Magic_code);
	moxafunc(ofsAddr, FC_FlushQueue, 2);

	moxafunc(ofsAddr, FC_EnableCH, Magic_code);
	MoxaPortLineStatus(port);
}

static void MoxaPortDisable(struct moxa_port *port)
{
	void __iomem *ofsAddr = port->tableAddr;

	moxafunc(ofsAddr, FC_SetFlowCtl, 0);	/* disable flow control */
	moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code);
	writew(0, ofsAddr + HostStat);
	moxafunc(ofsAddr, FC_DisableCH, Magic_code);
}

static speed_t MoxaPortSetBaud(struct moxa_port *port, speed_t baud)
{
	void __iomem *ofsAddr = port->tableAddr;
	unsigned int clock, val;
	speed_t max;

	max = MOXA_IS_320(port->board) ? 460800 : 921600;
	if (baud < 50)
		return 0;
	if (baud > max)
		baud = max;
	clock = 921600;
	val = clock / baud;
	moxafunc(ofsAddr, FC_SetBaud, val);
	baud = clock / val;
	return baud;
}

static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio,
		speed_t baud)
{
	void __iomem *ofsAddr;
	tcflag_t cflag;
	tcflag_t mode = 0;

	ofsAddr = port->tableAddr;
	cflag = termio->c_cflag;	/* termio->c_cflag */

	mode = termio->c_cflag & CSIZE;
	if (mode == CS5)
		mode = MX_CS5;
	else if (mode == CS6)
		mode = MX_CS6;
	else if (mode == CS7)
		mode = MX_CS7;
	else if (mode == CS8)
		mode = MX_CS8;

	if (termio->c_cflag & CSTOPB) {
		if (mode == MX_CS5)
			mode |= MX_STOP15;
		else
			mode |= MX_STOP2;
	} else
		mode |= MX_STOP1;

	if (termio->c_cflag & PARENB) {
		if (termio->c_cflag & PARODD)
			mode |= MX_PARODD;
		else
			mode |= MX_PAREVEN;
	} else
		mode |= MX_PARNONE;

	moxafunc(ofsAddr, FC_SetDataMode, (u16)mode);

	if (MOXA_IS_320(port->board) && baud >= 921600)
		return -1;

	baud = MoxaPortSetBaud(port, baud);

	if (termio->c_iflag & (IXON | IXOFF | IXANY)) {
		writeb(termio->c_cc[VSTART], ofsAddr + FuncArg);
		writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1);
		writeb(FC_SetXonXoff, ofsAddr + FuncCode);
		moxa_wait_finish(ofsAddr);

	}
	return baud;
}

static int MoxaPortGetLineOut(struct moxa_port *port, int *dtrState,
		int *rtsState)
{
	if (dtrState)
		*dtrState = !!(port->lineCtrl & DTR_ON);
	if (rtsState)
		*rtsState = !!(port->lineCtrl & RTS_ON);

	return 0;
}

static void MoxaPortLineCtrl(struct moxa_port *port, int dtr, int rts)
{
	u8 mode = 0;

	if (dtr)
		mode |= DTR_ON;
	if (rts)
		mode |= RTS_ON;
	port->lineCtrl = mode;
	moxafunc(port->tableAddr, FC_LineControl, mode);
}

static void MoxaPortFlowCtrl(struct moxa_port *port, int rts, int cts,
		int txflow, int rxflow, int txany)
{
	int mode = 0;

	if (rts)
		mode |= RTS_FlowCtl;
	if (cts)
		mode |= CTS_FlowCtl;
	if (txflow)
		mode |= Tx_FlowCtl;
	if (rxflow)
		mode |= Rx_FlowCtl;
	if (txany)
		mode |= IXM_IXANY;
	moxafunc(port->tableAddr, FC_SetFlowCtl, mode);
}

static int MoxaPortLineStatus(struct moxa_port *port)
{
	void __iomem *ofsAddr;
	int val;

	ofsAddr = port->tableAddr;
	if (MOXA_IS_320(port->board)) {
		moxafunc(ofsAddr, FC_LineStatus, 0);
		val = readw(ofsAddr + FuncArg);
	} else {
		val = readw(ofsAddr + FlagStat) >> 4;
	}
	val &= 0x0B;
	if (val & 8)
		val |= 4;
	spin_lock_bh(&moxa_lock);
	moxa_new_dcdstate(port, val & 8);
	spin_unlock_bh(&moxa_lock);
	val &= 7;
	return val;
}

static int MoxaPortWriteData(struct tty_struct *tty,
		const unsigned char *buffer, int len)
{
	struct moxa_port *port = tty->driver_data;
	void __iomem *baseAddr, *ofsAddr, *ofs;
	unsigned int c, total;
	u16 head, tail, tx_mask, spage, epage;
	u16 pageno, pageofs, bufhead;

	ofsAddr = port->tableAddr;
	baseAddr = port->board->basemem;
	tx_mask = readw(ofsAddr + TX_mask);
	spage = readw(ofsAddr + Page_txb);
	epage = readw(ofsAddr + EndPage_txb);
	tail = readw(ofsAddr + TXwptr);
	head = readw(ofsAddr + TXrptr);
	c = (head > tail) ? (head - tail - 1) : (head - tail + tx_mask);
	if (c > len)
		c = len;
	moxaLog.txcnt[port->port.tty->index] += c;
	total = c;
	if (spage == epage) {
		bufhead = readw(ofsAddr + Ofs_txb);
		writew(spage, baseAddr + Control_reg);
		while (c > 0) {
			if (head > tail)
				len = head - tail - 1;
			else
				len = tx_mask + 1 - tail;
			len = (c > len) ? len : c;
			ofs = baseAddr + DynPage_addr + bufhead + tail;
			memcpy_toio(ofs, buffer, len);
			buffer += len;
			tail = (tail + len) & tx_mask;
			c -= len;
		}
	} else {
		pageno = spage + (tail >> 13);
		pageofs = tail & Page_mask;
		while (c > 0) {
			len = Page_size - pageofs;
			if (len > c)
				len = c;
			writeb(pageno, baseAddr + Control_reg);
			ofs = baseAddr + DynPage_addr + pageofs;
			memcpy_toio(ofs, buffer, len);
			buffer += len;
			if (++pageno == epage)
				pageno = spage;
			pageofs = 0;
			c -= len;
		}
		tail = (tail + total) & tx_mask;
	}
	writew(tail, ofsAddr + TXwptr);
	writeb(1, ofsAddr + CD180TXirq);	/* start to send */
	return total;
}

static int MoxaPortReadData(struct moxa_port *port)
{
	struct tty_struct *tty = port->port.tty;
	unsigned char *dst;
	void __iomem *baseAddr, *ofsAddr, *ofs;
	unsigned int count, len, total;
	u16 tail, rx_mask, spage, epage;
	u16 pageno, pageofs, bufhead, head;

	ofsAddr = port->tableAddr;
	baseAddr = port->board->basemem;
	head = readw(ofsAddr + RXrptr);
	tail = readw(ofsAddr + RXwptr);
	rx_mask = readw(ofsAddr + RX_mask);
	spage = readw(ofsAddr + Page_rxb);
	epage = readw(ofsAddr + EndPage_rxb);
	count = (tail >= head) ? (tail - head) : (tail - head + rx_mask + 1);
	if (count == 0)
		return 0;

	total = count;
	moxaLog.rxcnt[tty->index] += total;
	if (spage == epage) {
		bufhead = readw(ofsAddr + Ofs_rxb);
		writew(spage, baseAddr + Control_reg);
		while (count > 0) {
			ofs = baseAddr + DynPage_addr + bufhead + head;
			len = (tail >= head) ? (tail - head) :
					(rx_mask + 1 - head);
			len = tty_prepare_flip_string(tty, &dst,
					min(len, count));
			memcpy_fromio(dst, ofs, len);
			head = (head + len) & rx_mask;
			count -= len;
		}
	} else {
		pageno = spage + (head >> 13);
		pageofs = head & Page_mask;
		while (count > 0) {
			writew(pageno, baseAddr + Control_reg);
			ofs = baseAddr + DynPage_addr + pageofs;
			len = tty_prepare_flip_string(tty, &dst,
					min(Page_size - pageofs, count));
			memcpy_fromio(dst, ofs, len);

			count -= len;
			pageofs = (pageofs + len) & Page_mask;
			if (pageofs == 0 && ++pageno == epage)
				pageno = spage;
		}
		head = (head + total) & rx_mask;
	}
	writew(head, ofsAddr + RXrptr);
	if (readb(ofsAddr + FlagStat) & Xoff_state) {
		moxaLowWaterChk = 1;
		port->lowChkFlag = 1;
	}
	return total;
}


static int MoxaPortTxQueue(struct moxa_port *port)
{
	void __iomem *ofsAddr = port->tableAddr;
	u16 rptr, wptr, mask;

	rptr = readw(ofsAddr + TXrptr);
	wptr = readw(ofsAddr + TXwptr);
	mask = readw(ofsAddr + TX_mask);
	return (wptr - rptr) & mask;
}

static int MoxaPortTxFree(struct moxa_port *port)
{
	void __iomem *ofsAddr = port->tableAddr;
	u16 rptr, wptr, mask;

	rptr = readw(ofsAddr + TXrptr);
	wptr = readw(ofsAddr + TXwptr);
	mask = readw(ofsAddr + TX_mask);
	return mask - ((wptr - rptr) & mask);
}

static int MoxaPortRxQueue(struct moxa_port *port)
{
	void __iomem *ofsAddr = port->tableAddr;
	u16 rptr, wptr, mask;

	rptr = readw(ofsAddr + RXrptr);
	wptr = readw(ofsAddr + RXwptr);
	mask = readw(ofsAddr + RX_mask);
	return (wptr - rptr) & mask;
}

static void MoxaPortTxDisable(struct moxa_port *port)
{
	moxafunc(port->tableAddr, FC_SetXoffState, Magic_code);
}

static void MoxaPortTxEnable(struct moxa_port *port)
{
	moxafunc(port->tableAddr, FC_SetXonState, Magic_code);
}

static int moxa_get_serial_info(struct moxa_port *info,
		struct serial_struct __user *retinfo)
{
	struct serial_struct tmp = {
		.type = info->type,
		.line = info->port.tty->index,
		.flags = info->port.flags,
		.baud_base = 921600,
		.close_delay = info->port.close_delay
	};
	return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
}


static int moxa_set_serial_info(struct moxa_port *info,
		struct serial_struct __user *new_info)
{
	struct serial_struct new_serial;

	if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
		return -EFAULT;

	if (new_serial.irq != 0 || new_serial.port != 0 ||
			new_serial.custom_divisor != 0 ||
			new_serial.baud_base != 921600)
		return -EPERM;

	if (!capable(CAP_SYS_ADMIN)) {
		if (((new_serial.flags & ~ASYNC_USR_MASK) !=
		     (info->port.flags & ~ASYNC_USR_MASK)))
			return -EPERM;
	} else
		info->port.close_delay = new_serial.close_delay * HZ / 100;

	new_serial.flags = (new_serial.flags & ~ASYNC_FLAGS);
	new_serial.flags |= (info->port.flags & ASYNC_FLAGS);

	MoxaSetFifo(info, new_serial.type == PORT_16550A);

	info->type = new_serial.type;
	return 0;
}



/*****************************************************************************
 *	Static local functions: 					     *
 *****************************************************************************/

static void MoxaSetFifo(struct moxa_port *port, int enable)
{
	void __iomem *ofsAddr = port->tableAddr;

	if (!enable) {
		moxafunc(ofsAddr, FC_SetRxFIFOTrig, 0);
		moxafunc(ofsAddr, FC_SetTxFIFOCnt, 1);
	} else {
		moxafunc(ofsAddr, FC_SetRxFIFOTrig, 3);
		moxafunc(ofsAddr, FC_SetTxFIFOCnt, 16);
	}
}
OpenPOWER on IntegriCloud