summaryrefslogtreecommitdiffstats
path: root/drivers/char/nozomi.c
blob: 2ad7d37afbd080306d849d8a4558daca888f2e9b (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
/*
 * nozomi.c  -- HSDPA driver Broadband Wireless Data Card - Globe Trotter
 *
 * Written by: Ulf Jakobsson,
 *             Jan Åkerfeldt,
 *             Stefan Thomasson,
 *
 * Maintained by: Paul Hardwick (p.hardwick@option.com)
 *
 * Patches:
 *          Locking code changes for Vodafone by Sphere Systems Ltd,
 *                              Andrew Bird (ajb@spheresystems.co.uk )
 *                              & Phil Sanderson
 *
 * Source has been ported from an implementation made by Filip Aben @ Option
 *
 * --------------------------------------------------------------------------
 *
 * Copyright (c) 2005,2006 Option Wireless Sweden AB
 * Copyright (c) 2006 Sphere Systems Ltd
 * Copyright (c) 2006 Option Wireless n/v
 * All rights Reserved.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * --------------------------------------------------------------------------
 */

/* Enable this to have a lot of debug printouts */
#define DEBUG

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/sched.h>
#include <linux/serial.h>
#include <linux/interrupt.h>
#include <linux/kmod.h>
#include <linux/init.h>
#include <linux/kfifo.h>
#include <linux/uaccess.h>
#include <asm/byteorder.h>

#include <linux/delay.h>


#define VERSION_STRING DRIVER_DESC " 2.1d (build date: " \
					__DATE__ " " __TIME__ ")"

/*    Macros definitions */

/* Default debug printout level */
#define NOZOMI_DEBUG_LEVEL 0x00

#define P_BUF_SIZE 128
#define NFO(_err_flag_, args...)				\
do {								\
	char tmp[P_BUF_SIZE];					\
	snprintf(tmp, sizeof(tmp), ##args);			\
	printk(_err_flag_ "[%d] %s(): %s\n", __LINE__,		\
		__func__, tmp);				\
} while (0)

#define DBG1(args...) D_(0x01, ##args)
#define DBG2(args...) D_(0x02, ##args)
#define DBG3(args...) D_(0x04, ##args)
#define DBG4(args...) D_(0x08, ##args)
#define DBG5(args...) D_(0x10, ##args)
#define DBG6(args...) D_(0x20, ##args)
#define DBG7(args...) D_(0x40, ##args)
#define DBG8(args...) D_(0x80, ##args)

#ifdef DEBUG
/* Do we need this settable at runtime? */
static int debug = NOZOMI_DEBUG_LEVEL;

#define D(lvl, args...)  do \
			{if (lvl & debug) NFO(KERN_DEBUG, ##args); } \
			while (0)
#define D_(lvl, args...) D(lvl, ##args)

/* These printouts are always printed */

#else
static int debug;
#define D_(lvl, args...)
#endif

/* TODO: rewrite to optimize macros... */

#define TMP_BUF_MAX 256

#define DUMP(buf__,len__) \
  do {  \
    char tbuf[TMP_BUF_MAX] = {0};\
    if (len__ > 1) {\
	snprintf(tbuf, len__ > TMP_BUF_MAX ? TMP_BUF_MAX : len__, "%s", buf__);\
	if (tbuf[len__-2] == '\r') {\
		tbuf[len__-2] = 'r';\
	} \
	DBG1("SENDING: '%s' (%d+n)", tbuf, len__);\
    } else {\
	DBG1("SENDING: '%s' (%d)", tbuf, len__);\
    } \
} while (0)

/*    Defines */
#define NOZOMI_NAME		"nozomi"
#define NOZOMI_NAME_TTY		"nozomi_tty"
#define DRIVER_DESC		"Nozomi driver"

#define NTTY_TTY_MAXMINORS	256
#define NTTY_FIFO_BUFFER_SIZE	8192

/* Must be power of 2 */
#define FIFO_BUFFER_SIZE_UL	8192

/* Size of tmp send buffer to card */
#define SEND_BUF_MAX		1024
#define RECEIVE_BUF_MAX		4


/* Define all types of vendors and devices to support */
#define VENDOR1		0x1931	/* Vendor Option */
#define DEVICE1		0x000c	/* HSDPA card */

#define R_IIR		0x0000	/* Interrupt Identity Register */
#define R_FCR		0x0000	/* Flow Control Register */
#define R_IER		0x0004	/* Interrupt Enable Register */

#define CONFIG_MAGIC	0xEFEFFEFE
#define TOGGLE_VALID	0x0000

/* Definition of interrupt tokens */
#define MDM_DL1		0x0001
#define MDM_UL1		0x0002
#define MDM_DL2		0x0004
#define MDM_UL2		0x0008
#define DIAG_DL1	0x0010
#define DIAG_DL2	0x0020
#define DIAG_UL		0x0040
#define APP1_DL		0x0080
#define APP1_UL		0x0100
#define APP2_DL		0x0200
#define APP2_UL		0x0400
#define CTRL_DL		0x0800
#define CTRL_UL		0x1000
#define RESET		0x8000

#define MDM_DL		(MDM_DL1  | MDM_DL2)
#define MDM_UL		(MDM_UL1  | MDM_UL2)
#define DIAG_DL		(DIAG_DL1 | DIAG_DL2)

/* modem signal definition */
#define CTRL_DSR	0x0001
#define CTRL_DCD	0x0002
#define CTRL_RI		0x0004
#define CTRL_CTS	0x0008

#define CTRL_DTR	0x0001
#define CTRL_RTS	0x0002

#define MAX_PORT		4
#define NOZOMI_MAX_PORTS	5
#define NOZOMI_MAX_CARDS	(NTTY_TTY_MAXMINORS / MAX_PORT)

/*    Type definitions */

/*
 * There are two types of nozomi cards,
 * one with 2048 memory and with 8192 memory
 */
enum card_type {
	F32_2 = 2048,	/* 512 bytes downlink + uplink * 2 -> 2048 */
	F32_8 = 8192,	/* 3072 bytes downl. + 1024 bytes uplink * 2 -> 8192 */
};

/* Initialization states a card can be in */
enum card_state {
	NOZOMI_STATE_UKNOWN	= 0,
	NOZOMI_STATE_ENABLED	= 1,	/* pci device enabled */
	NOZOMI_STATE_ALLOCATED	= 2,	/* config setup done */
	NOZOMI_STATE_READY	= 3,	/* flowcontrols received */
};

/* Two different toggle channels exist */
enum channel_type {
	CH_A = 0,
	CH_B = 1,
};

/* Port definition for the card regarding flow control */
enum ctrl_port_type {
	CTRL_CMD	= 0,
	CTRL_MDM	= 1,
	CTRL_DIAG	= 2,
	CTRL_APP1	= 3,
	CTRL_APP2	= 4,
	CTRL_ERROR	= -1,
};

/* Ports that the nozomi has */
enum port_type {
	PORT_MDM	= 0,
	PORT_DIAG	= 1,
	PORT_APP1	= 2,
	PORT_APP2	= 3,
	PORT_CTRL	= 4,
	PORT_ERROR	= -1,
};

#ifdef __BIG_ENDIAN
/* Big endian */

struct toggles {
	unsigned int enabled:5;	/*
				 * Toggle fields are valid if enabled is 0,
				 * else A-channels must always be used.
				 */
	unsigned int diag_dl:1;
	unsigned int mdm_dl:1;
	unsigned int mdm_ul:1;
} __attribute__ ((packed));

/* Configuration table to read at startup of card */
/* Is for now only needed during initialization phase */
struct config_table {
	u32 signature;
	u16 product_information;
	u16 version;
	u8 pad3[3];
	struct toggles toggle;
	u8 pad1[4];
	u16 dl_mdm_len1;	/*
				 * If this is 64, it can hold
				 * 60 bytes + 4 that is length field
				 */
	u16 dl_start;

	u16 dl_diag_len1;
	u16 dl_mdm_len2;	/*
				 * If this is 64, it can hold
				 * 60 bytes + 4 that is length field
				 */
	u16 dl_app1_len;

	u16 dl_diag_len2;
	u16 dl_ctrl_len;
	u16 dl_app2_len;
	u8 pad2[16];
	u16 ul_mdm_len1;
	u16 ul_start;
	u16 ul_diag_len;
	u16 ul_mdm_len2;
	u16 ul_app1_len;
	u16 ul_app2_len;
	u16 ul_ctrl_len;
} __attribute__ ((packed));

/* This stores all control downlink flags */
struct ctrl_dl {
	u8 port;
	unsigned int reserved:4;
	unsigned int CTS:1;
	unsigned int RI:1;
	unsigned int DCD:1;
	unsigned int DSR:1;
} __attribute__ ((packed));

/* This stores all control uplink flags */
struct ctrl_ul {
	u8 port;
	unsigned int reserved:6;
	unsigned int RTS:1;
	unsigned int DTR:1;
} __attribute__ ((packed));

#else
/* Little endian */

/* This represents the toggle information */
struct toggles {
	unsigned int mdm_ul:1;
	unsigned int mdm_dl:1;
	unsigned int diag_dl:1;
	unsigned int enabled:5;	/*
				 * Toggle fields are valid if enabled is 0,
				 * else A-channels must always be used.
				 */
} __attribute__ ((packed));

/* Configuration table to read at startup of card */
struct config_table {
	u32 signature;
	u16 version;
	u16 product_information;
	struct toggles toggle;
	u8 pad1[7];
	u16 dl_start;
	u16 dl_mdm_len1;	/*
				 * If this is 64, it can hold
				 * 60 bytes + 4 that is length field
				 */
	u16 dl_mdm_len2;
	u16 dl_diag_len1;
	u16 dl_diag_len2;
	u16 dl_app1_len;
	u16 dl_app2_len;
	u16 dl_ctrl_len;
	u8 pad2[16];
	u16 ul_start;
	u16 ul_mdm_len2;
	u16 ul_mdm_len1;
	u16 ul_diag_len;
	u16 ul_app1_len;
	u16 ul_app2_len;
	u16 ul_ctrl_len;
} __attribute__ ((packed));

/* This stores all control downlink flags */
struct ctrl_dl {
	unsigned int DSR:1;
	unsigned int DCD:1;
	unsigned int RI:1;
	unsigned int CTS:1;
	unsigned int reserverd:4;
	u8 port;
} __attribute__ ((packed));

/* This stores all control uplink flags */
struct ctrl_ul {
	unsigned int DTR:1;
	unsigned int RTS:1;
	unsigned int reserved:6;
	u8 port;
} __attribute__ ((packed));
#endif

/* This holds all information that is needed regarding a port */
struct port {
	struct tty_port port;
	u8 update_flow_control;
	struct ctrl_ul ctrl_ul;
	struct ctrl_dl ctrl_dl;
	struct kfifo fifo_ul;
	void __iomem *dl_addr[2];
	u32 dl_size[2];
	u8 toggle_dl;
	void __iomem *ul_addr[2];
	u32 ul_size[2];
	u8 toggle_ul;
	u16 token_dl;

	/* mutex to ensure one access patch to this port */
	struct mutex tty_sem;
	wait_queue_head_t tty_wait;
	struct async_icount tty_icount;
};

/* Private data one for each card in the system */
struct nozomi {
	void __iomem *base_addr;
	unsigned long flip;

	/* Pointers to registers */
	void __iomem *reg_iir;
	void __iomem *reg_fcr;
	void __iomem *reg_ier;

	u16 last_ier;
	enum card_type card_type;
	struct config_table config_table;	/* Configuration table */
	struct pci_dev *pdev;
	struct port port[NOZOMI_MAX_PORTS];
	u8 *send_buf;

	spinlock_t spin_mutex;	/* secures access to registers and tty */

	unsigned int index_start;
	enum card_state state;
	u32 open_ttys;
};

/* This is a data packet that is read or written to/from card */
struct buffer {
	u32 size;		/* size is the length of the data buffer */
	u8 *data;
} __attribute__ ((packed));

/*    Global variables */
static const struct pci_device_id nozomi_pci_tbl[] __devinitconst = {
	{PCI_DEVICE(VENDOR1, DEVICE1)},
	{},
};

MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl);

static struct nozomi *ndevs[NOZOMI_MAX_CARDS];
static struct tty_driver *ntty_driver;

/*
 * find card by tty_index
 */
static inline struct nozomi *get_dc_by_tty(const struct tty_struct *tty)
{
	return tty ? ndevs[tty->index / MAX_PORT] : NULL;
}

static inline struct port *get_port_by_tty(const struct tty_struct *tty)
{
	struct nozomi *ndev = get_dc_by_tty(tty);
	return ndev ? &ndev->port[tty->index % MAX_PORT] : NULL;
}

/*
 * TODO:
 * -Optimize
 * -Rewrite cleaner
 */

static void read_mem32(u32 *buf, const void __iomem *mem_addr_start,
			u32 size_bytes)
{
	u32 i = 0;
	const u32 __iomem *ptr = mem_addr_start;
	u16 *buf16;

	if (unlikely(!ptr || !buf))
		goto out;

	/* shortcut for extremely often used cases */
	switch (size_bytes) {
	case 2:	/* 2 bytes */
		buf16 = (u16 *) buf;
		*buf16 = __le16_to_cpu(readw(ptr));
		goto out;
		break;
	case 4:	/* 4 bytes */
		*(buf) = __le32_to_cpu(readl(ptr));
		goto out;
		break;
	}

	while (i < size_bytes) {
		if (size_bytes - i == 2) {
			/* Handle 2 bytes in the end */
			buf16 = (u16 *) buf;
			*(buf16) = __le16_to_cpu(readw(ptr));
			i += 2;
		} else {
			/* Read 4 bytes */
			*(buf) = __le32_to_cpu(readl(ptr));
			i += 4;
		}
		buf++;
		ptr++;
	}
out:
	return;
}

/*
 * TODO:
 * -Optimize
 * -Rewrite cleaner
 */
static u32 write_mem32(void __iomem *mem_addr_start, const u32 *buf,
			u32 size_bytes)
{
	u32 i = 0;
	u32 __iomem *ptr = mem_addr_start;
	const u16 *buf16;

	if (unlikely(!ptr || !buf))
		return 0;

	/* shortcut for extremely often used cases */
	switch (size_bytes) {
	case 2:	/* 2 bytes */
		buf16 = (const u16 *)buf;
		writew(__cpu_to_le16(*buf16), ptr);
		return 2;
		break;
	case 1: /*
		 * also needs to write 4 bytes in this case
		 * so falling through..
		 */
	case 4: /* 4 bytes */
		writel(__cpu_to_le32(*buf), ptr);
		return 4;
		break;
	}

	while (i < size_bytes) {
		if (size_bytes - i == 2) {
			/* 2 bytes */
			buf16 = (const u16 *)buf;
			writew(__cpu_to_le16(*buf16), ptr);
			i += 2;
		} else {
			/* 4 bytes */
			writel(__cpu_to_le32(*buf), ptr);
			i += 4;
		}
		buf++;
		ptr++;
	}
	return i;
}

/* Setup pointers to different channels and also setup buffer sizes. */
static void setup_memory(struct nozomi *dc)
{
	void __iomem *offset = dc->base_addr + dc->config_table.dl_start;
	/* The length reported is including the length field of 4 bytes,
	 * hence subtract with 4.
	 */
	const u16 buff_offset = 4;

	/* Modem port dl configuration */
	dc->port[PORT_MDM].dl_addr[CH_A] = offset;
	dc->port[PORT_MDM].dl_addr[CH_B] =
				(offset += dc->config_table.dl_mdm_len1);
	dc->port[PORT_MDM].dl_size[CH_A] =
				dc->config_table.dl_mdm_len1 - buff_offset;
	dc->port[PORT_MDM].dl_size[CH_B] =
				dc->config_table.dl_mdm_len2 - buff_offset;

	/* Diag port dl configuration */
	dc->port[PORT_DIAG].dl_addr[CH_A] =
				(offset += dc->config_table.dl_mdm_len2);
	dc->port[PORT_DIAG].dl_size[CH_A] =
				dc->config_table.dl_diag_len1 - buff_offset;
	dc->port[PORT_DIAG].dl_addr[CH_B] =
				(offset += dc->config_table.dl_diag_len1);
	dc->port[PORT_DIAG].dl_size[CH_B] =
				dc->config_table.dl_diag_len2 - buff_offset;

	/* App1 port dl configuration */
	dc->port[PORT_APP1].dl_addr[CH_A] =
				(offset += dc->config_table.dl_diag_len2);
	dc->port[PORT_APP1].dl_size[CH_A] =
				dc->config_table.dl_app1_len - buff_offset;

	/* App2 port dl configuration */
	dc->port[PORT_APP2].dl_addr[CH_A] =
				(offset += dc->config_table.dl_app1_len);
	dc->port[PORT_APP2].dl_size[CH_A] =
				dc->config_table.dl_app2_len - buff_offset;

	/* Ctrl dl configuration */
	dc->port[PORT_CTRL].dl_addr[CH_A] =
				(offset += dc->config_table.dl_app2_len);
	dc->port[PORT_CTRL].dl_size[CH_A] =
				dc->config_table.dl_ctrl_len - buff_offset;

	offset = dc->base_addr + dc->config_table.ul_start;

	/* Modem Port ul configuration */
	dc->port[PORT_MDM].ul_addr[CH_A] = offset;
	dc->port[PORT_MDM].ul_size[CH_A] =
				dc->config_table.ul_mdm_len1 - buff_offset;
	dc->port[PORT_MDM].ul_addr[CH_B] =
				(offset += dc->config_table.ul_mdm_len1);
	dc->port[PORT_MDM].ul_size[CH_B] =
				dc->config_table.ul_mdm_len2 - buff_offset;

	/* Diag port ul configuration */
	dc->port[PORT_DIAG].ul_addr[CH_A] =
				(offset += dc->config_table.ul_mdm_len2);
	dc->port[PORT_DIAG].ul_size[CH_A] =
				dc->config_table.ul_diag_len - buff_offset;

	/* App1 port ul configuration */
	dc->port[PORT_APP1].ul_addr[CH_A] =
				(offset += dc->config_table.ul_diag_len);
	dc->port[PORT_APP1].ul_size[CH_A] =
				dc->config_table.ul_app1_len - buff_offset;

	/* App2 port ul configuration */
	dc->port[PORT_APP2].ul_addr[CH_A] =
				(offset += dc->config_table.ul_app1_len);
	dc->port[PORT_APP2].ul_size[CH_A] =
				dc->config_table.ul_app2_len - buff_offset;

	/* Ctrl ul configuration */
	dc->port[PORT_CTRL].ul_addr[CH_A] =
				(offset += dc->config_table.ul_app2_len);
	dc->port[PORT_CTRL].ul_size[CH_A] =
				dc->config_table.ul_ctrl_len - buff_offset;
}

/* Dump config table under initalization phase */
#ifdef DEBUG
static void dump_table(const struct nozomi *dc)
{
	DBG3("signature: 0x%08X", dc->config_table.signature);
	DBG3("version: 0x%04X", dc->config_table.version);
	DBG3("product_information: 0x%04X", \
				dc->config_table.product_information);
	DBG3("toggle enabled: %d", dc->config_table.toggle.enabled);
	DBG3("toggle up_mdm: %d", dc->config_table.toggle.mdm_ul);
	DBG3("toggle dl_mdm: %d", dc->config_table.toggle.mdm_dl);
	DBG3("toggle dl_dbg: %d", dc->config_table.toggle.diag_dl);

	DBG3("dl_start: 0x%04X", dc->config_table.dl_start);
	DBG3("dl_mdm_len0: 0x%04X, %d", dc->config_table.dl_mdm_len1,
	   dc->config_table.dl_mdm_len1);
	DBG3("dl_mdm_len1: 0x%04X, %d", dc->config_table.dl_mdm_len2,
	   dc->config_table.dl_mdm_len2);
	DBG3("dl_diag_len0: 0x%04X, %d", dc->config_table.dl_diag_len1,
	   dc->config_table.dl_diag_len1);
	DBG3("dl_diag_len1: 0x%04X, %d", dc->config_table.dl_diag_len2,
	   dc->config_table.dl_diag_len2);
	DBG3("dl_app1_len: 0x%04X, %d", dc->config_table.dl_app1_len,
	   dc->config_table.dl_app1_len);
	DBG3("dl_app2_len: 0x%04X, %d", dc->config_table.dl_app2_len,
	   dc->config_table.dl_app2_len);
	DBG3("dl_ctrl_len: 0x%04X, %d", dc->config_table.dl_ctrl_len,
	   dc->config_table.dl_ctrl_len);
	DBG3("ul_start: 0x%04X, %d", dc->config_table.ul_start,
	   dc->config_table.ul_start);
	DBG3("ul_mdm_len[0]: 0x%04X, %d", dc->config_table.ul_mdm_len1,
	   dc->config_table.ul_mdm_len1);
	DBG3("ul_mdm_len[1]: 0x%04X, %d", dc->config_table.ul_mdm_len2,
	   dc->config_table.ul_mdm_len2);
	DBG3("ul_diag_len: 0x%04X, %d", dc->config_table.ul_diag_len,
	   dc->config_table.ul_diag_len);
	DBG3("ul_app1_len: 0x%04X, %d", dc->config_table.ul_app1_len,
	   dc->config_table.ul_app1_len);
	DBG3("ul_app2_len: 0x%04X, %d", dc->config_table.ul_app2_len,
	   dc->config_table.ul_app2_len);
	DBG3("ul_ctrl_len: 0x%04X, %d", dc->config_table.ul_ctrl_len,
	   dc->config_table.ul_ctrl_len);
}
#else
static inline void dump_table(const struct nozomi *dc) { }
#endif

/*
 * Read configuration table from card under intalization phase
 * Returns 1 if ok, else 0
 */
static int nozomi_read_config_table(struct nozomi *dc)
{
	read_mem32((u32 *) &dc->config_table, dc->base_addr + 0,
						sizeof(struct config_table));

	if (dc->config_table.signature != CONFIG_MAGIC) {
		dev_err(&dc->pdev->dev, "ConfigTable Bad! 0x%08X != 0x%08X\n",
			dc->config_table.signature, CONFIG_MAGIC);
		return 0;
	}

	if ((dc->config_table.version == 0)
	    || (dc->config_table.toggle.enabled == TOGGLE_VALID)) {
		int i;
		DBG1("Second phase, configuring card");

		setup_memory(dc);

		dc->port[PORT_MDM].toggle_ul = dc->config_table.toggle.mdm_ul;
		dc->port[PORT_MDM].toggle_dl = dc->config_table.toggle.mdm_dl;
		dc->port[PORT_DIAG].toggle_dl = dc->config_table.toggle.diag_dl;
		DBG1("toggle ports: MDM UL:%d MDM DL:%d, DIAG DL:%d",
		   dc->port[PORT_MDM].toggle_ul,
		   dc->port[PORT_MDM].toggle_dl, dc->port[PORT_DIAG].toggle_dl);

		dump_table(dc);

		for (i = PORT_MDM; i < MAX_PORT; i++) {
			memset(&dc->port[i].ctrl_dl, 0, sizeof(struct ctrl_dl));
			memset(&dc->port[i].ctrl_ul, 0, sizeof(struct ctrl_ul));
		}

		/* Enable control channel */
		dc->last_ier = dc->last_ier | CTRL_DL;
		writew(dc->last_ier, dc->reg_ier);

		dc->state = NOZOMI_STATE_ALLOCATED;
		dev_info(&dc->pdev->dev, "Initialization OK!\n");
		return 1;
	}

	if ((dc->config_table.version > 0)
	    && (dc->config_table.toggle.enabled != TOGGLE_VALID)) {
		u32 offset = 0;
		DBG1("First phase: pushing upload buffers, clearing download");

		dev_info(&dc->pdev->dev, "Version of card: %d\n",
			 dc->config_table.version);

		/* Here we should disable all I/O over F32. */
		setup_memory(dc);

		/*
		 * We should send ALL channel pair tokens back along
		 * with reset token
		 */

		/* push upload modem buffers */
		write_mem32(dc->port[PORT_MDM].ul_addr[CH_A],
			(u32 *) &offset, 4);
		write_mem32(dc->port[PORT_MDM].ul_addr[CH_B],
			(u32 *) &offset, 4);

		writew(MDM_UL | DIAG_DL | MDM_DL, dc->reg_fcr);

		DBG1("First phase done");
	}

	return 1;
}

/* Enable uplink interrupts  */
static void enable_transmit_ul(enum port_type port, struct nozomi *dc)
{
	static const u16 mask[] = {MDM_UL, DIAG_UL, APP1_UL, APP2_UL, CTRL_UL};

	if (port < NOZOMI_MAX_PORTS) {
		dc->last_ier |= mask[port];
		writew(dc->last_ier, dc->reg_ier);
	} else {
		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
	}
}

/* Disable uplink interrupts  */
static void disable_transmit_ul(enum port_type port, struct nozomi *dc)
{
	static const u16 mask[] =
		{~MDM_UL, ~DIAG_UL, ~APP1_UL, ~APP2_UL, ~CTRL_UL};

	if (port < NOZOMI_MAX_PORTS) {
		dc->last_ier &= mask[port];
		writew(dc->last_ier, dc->reg_ier);
	} else {
		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
	}
}

/* Enable downlink interrupts */
static void enable_transmit_dl(enum port_type port, struct nozomi *dc)
{
	static const u16 mask[] = {MDM_DL, DIAG_DL, APP1_DL, APP2_DL, CTRL_DL};

	if (port < NOZOMI_MAX_PORTS) {
		dc->last_ier |= mask[port];
		writew(dc->last_ier, dc->reg_ier);
	} else {
		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
	}
}

/* Disable downlink interrupts */
static void disable_transmit_dl(enum port_type port, struct nozomi *dc)
{
	static const u16 mask[] =
		{~MDM_DL, ~DIAG_DL, ~APP1_DL, ~APP2_DL, ~CTRL_DL};

	if (port < NOZOMI_MAX_PORTS) {
		dc->last_ier &= mask[port];
		writew(dc->last_ier, dc->reg_ier);
	} else {
		dev_err(&dc->pdev->dev, "Called with wrong port?\n");
	}
}

/*
 * Return 1 - send buffer to card and ack.
 * Return 0 - don't ack, don't send buffer to card.
 */
static int send_data(enum port_type index, struct nozomi *dc)
{
	u32 size = 0;
	struct port *port = &dc->port[index];
	const u8 toggle = port->toggle_ul;
	void __iomem *addr = port->ul_addr[toggle];
	const u32 ul_size = port->ul_size[toggle];
	struct tty_struct *tty = tty_port_tty_get(&port->port);

	/* Get data from tty and place in buf for now */
	size = kfifo_out(&port->fifo_ul, dc->send_buf,
			   ul_size < SEND_BUF_MAX ? ul_size : SEND_BUF_MAX);

	if (size == 0) {
		DBG4("No more data to send, disable link:");
		tty_kref_put(tty);
		return 0;
	}

	/* DUMP(buf, size); */

	/* Write length + data */
	write_mem32(addr, (u32 *) &size, 4);
	write_mem32(addr + 4, (u32 *) dc->send_buf, size);

	if (tty)
		tty_wakeup(tty);

	tty_kref_put(tty);
	return 1;
}

/* If all data has been read, return 1, else 0 */
static int receive_data(enum port_type index, struct nozomi *dc)
{
	u8 buf[RECEIVE_BUF_MAX] = { 0 };
	int size;
	u32 offset = 4;
	struct port *port = &dc->port[index];
	void __iomem *addr = port->dl_addr[port->toggle_dl];
	struct tty_struct *tty = tty_port_tty_get(&port->port);
	int i, ret;

	if (unlikely(!tty)) {
		DBG1("tty not open for port: %d?", index);
		return 1;
	}

	read_mem32((u32 *) &size, addr, 4);
	/*  DBG1( "%d bytes port: %d", size, index); */

	if (test_bit(TTY_THROTTLED, &tty->flags)) {
		DBG1("No room in tty, don't read data, don't ack interrupt, "
			"disable interrupt");

		/* disable interrupt in downlink... */
		disable_transmit_dl(index, dc);
		ret = 0;
		goto put;
	}

	if (unlikely(size == 0)) {
		dev_err(&dc->pdev->dev, "size == 0?\n");
		ret = 1;
		goto put;
	}

	tty_buffer_request_room(tty, size);

	while (size > 0) {
		read_mem32((u32 *) buf, addr + offset, RECEIVE_BUF_MAX);

		if (size == 1) {
			tty_insert_flip_char(tty, buf[0], TTY_NORMAL);
			size = 0;
		} else if (size < RECEIVE_BUF_MAX) {
			size -= tty_insert_flip_string(tty, (char *) buf, size);
		} else {
			i = tty_insert_flip_string(tty, \
						(char *) buf, RECEIVE_BUF_MAX);
			size -= i;
			offset += i;
		}
	}

	set_bit(index, &dc->flip);
	ret = 1;
put:
	tty_kref_put(tty);
	return ret;
}

/* Debug for interrupts */
#ifdef DEBUG
static char *interrupt2str(u16 interrupt)
{
	static char buf[TMP_BUF_MAX];
	char *p = buf;

	interrupt & MDM_DL1 ? p += snprintf(p, TMP_BUF_MAX, "MDM_DL1 ") : NULL;
	interrupt & MDM_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
					"MDM_DL2 ") : NULL;

	interrupt & MDM_UL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
					"MDM_UL1 ") : NULL;
	interrupt & MDM_UL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
					"MDM_UL2 ") : NULL;

	interrupt & DIAG_DL1 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
					"DIAG_DL1 ") : NULL;
	interrupt & DIAG_DL2 ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
					"DIAG_DL2 ") : NULL;

	interrupt & DIAG_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
					"DIAG_UL ") : NULL;

	interrupt & APP1_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
					"APP1_DL ") : NULL;
	interrupt & APP2_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
					"APP2_DL ") : NULL;

	interrupt & APP1_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
					"APP1_UL ") : NULL;
	interrupt & APP2_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
					"APP2_UL ") : NULL;

	interrupt & CTRL_DL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
					"CTRL_DL ") : NULL;
	interrupt & CTRL_UL ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
					"CTRL_UL ") : NULL;

	interrupt & RESET ? p += snprintf(p, TMP_BUF_MAX - (p - buf),
					"RESET ") : NULL;

	return buf;
}
#endif

/*
 * Receive flow control
 * Return 1 - If ok, else 0
 */
static int receive_flow_control(struct nozomi *dc)
{
	enum port_type port = PORT_MDM;
	struct ctrl_dl ctrl_dl;
	struct ctrl_dl old_ctrl;
	u16 enable_ier = 0;

	read_mem32((u32 *) &ctrl_dl, dc->port[PORT_CTRL].dl_addr[CH_A], 2);

	switch (ctrl_dl.port) {
	case CTRL_CMD:
		DBG1("The Base Band sends this value as a response to a "
			"request for IMSI detach sent over the control "
			"channel uplink (see section 7.6.1).");
		break;
	case CTRL_MDM:
		port = PORT_MDM;
		enable_ier = MDM_DL;
		break;
	case CTRL_DIAG:
		port = PORT_DIAG;
		enable_ier = DIAG_DL;
		break;
	case CTRL_APP1:
		port = PORT_APP1;
		enable_ier = APP1_DL;
		break;
	case CTRL_APP2:
		port = PORT_APP2;
		enable_ier = APP2_DL;
		if (dc->state == NOZOMI_STATE_ALLOCATED) {
			/*
			 * After card initialization the flow control
			 * received for APP2 is always the last
			 */
			dc->state = NOZOMI_STATE_READY;
			dev_info(&dc->pdev->dev, "Device READY!\n");
		}
		break;
	default:
		dev_err(&dc->pdev->dev,
			"ERROR: flow control received for non-existing port\n");
		return 0;
	};

	DBG1("0x%04X->0x%04X", *((u16 *)&dc->port[port].ctrl_dl),
	   *((u16 *)&ctrl_dl));

	old_ctrl = dc->port[port].ctrl_dl;
	dc->port[port].ctrl_dl = ctrl_dl;

	if (old_ctrl.CTS == 1 && ctrl_dl.CTS == 0) {
		DBG1("Disable interrupt (0x%04X) on port: %d",
			enable_ier, port);
		disable_transmit_ul(port, dc);

	} else if (old_ctrl.CTS == 0 && ctrl_dl.CTS == 1) {

		if (kfifo_len(&dc->port[port].fifo_ul)) {
			DBG1("Enable interrupt (0x%04X) on port: %d",
				enable_ier, port);
			DBG1("Data in buffer [%d], enable transmit! ",
				kfifo_len(&dc->port[port].fifo_ul));
			enable_transmit_ul(port, dc);
		} else {
			DBG1("No data in buffer...");
		}
	}

	if (*(u16 *)&old_ctrl == *(u16 *)&ctrl_dl) {
		DBG1(" No change in mctrl");
		return 1;
	}
	/* Update statistics */
	if (old_ctrl.CTS != ctrl_dl.CTS)
		dc->port[port].tty_icount.cts++;
	if (old_ctrl.DSR != ctrl_dl.DSR)
		dc->port[port].tty_icount.dsr++;
	if (old_ctrl.RI != ctrl_dl.RI)
		dc->port[port].tty_icount.rng++;
	if (old_ctrl.DCD != ctrl_dl.DCD)
		dc->port[port].tty_icount.dcd++;

	wake_up_interruptible(&dc->port[port].tty_wait);

	DBG1("port: %d DCD(%d), CTS(%d), RI(%d), DSR(%d)",
	   port,
	   dc->port[port].tty_icount.dcd, dc->port[port].tty_icount.cts,
	   dc->port[port].tty_icount.rng, dc->port[port].tty_icount.dsr);

	return 1;
}

static enum ctrl_port_type port2ctrl(enum port_type port,
					const struct nozomi *dc)
{
	switch (port) {
	case PORT_MDM:
		return CTRL_MDM;
	case PORT_DIAG:
		return CTRL_DIAG;
	case PORT_APP1:
		return CTRL_APP1;
	case PORT_APP2:
		return CTRL_APP2;
	default:
		dev_err(&dc->pdev->dev,
			"ERROR: send flow control " \
			"received for non-existing port\n");
	};
	return CTRL_ERROR;
}

/*
 * Send flow control, can only update one channel at a time
 * Return 0 - If we have updated all flow control
 * Return 1 - If we need to update more flow control, ack current enable more
 */
static int send_flow_control(struct nozomi *dc)
{
	u32 i, more_flow_control_to_be_updated = 0;
	u16 *ctrl;

	for (i = PORT_MDM; i < MAX_PORT; i++) {
		if (dc->port[i].update_flow_control) {
			if (more_flow_control_to_be_updated) {
				/* We have more flow control to be updated */
				return 1;
			}
			dc->port[i].ctrl_ul.port = port2ctrl(i, dc);
			ctrl = (u16 *)&dc->port[i].ctrl_ul;
			write_mem32(dc->port[PORT_CTRL].ul_addr[0], \
				(u32 *) ctrl, 2);
			dc->port[i].update_flow_control = 0;
			more_flow_control_to_be_updated = 1;
		}
	}
	return 0;
}

/*
 * Handle downlink data, ports that are handled are modem and diagnostics
 * Return 1 - ok
 * Return 0 - toggle fields are out of sync
 */
static int handle_data_dl(struct nozomi *dc, enum port_type port, u8 *toggle,
			u16 read_iir, u16 mask1, u16 mask2)
{
	if (*toggle == 0 && read_iir & mask1) {
		if (receive_data(port, dc)) {
			writew(mask1, dc->reg_fcr);
			*toggle = !(*toggle);
		}

		if (read_iir & mask2) {
			if (receive_data(port, dc)) {
				writew(mask2, dc->reg_fcr);
				*toggle = !(*toggle);
			}
		}
	} else if (*toggle == 1 && read_iir & mask2) {
		if (receive_data(port, dc)) {
			writew(mask2, dc->reg_fcr);
			*toggle = !(*toggle);
		}

		if (read_iir & mask1) {
			if (receive_data(port, dc)) {
				writew(mask1, dc->reg_fcr);
				*toggle = !(*toggle);
			}
		}
	} else {
		dev_err(&dc->pdev->dev, "port out of sync!, toggle:%d\n",
			*toggle);
		return 0;
	}
	return 1;
}

/*
 * Handle uplink data, this is currently for the modem port
 * Return 1 - ok
 * Return 0 - toggle field are out of sync
 */
static int handle_data_ul(struct nozomi *dc, enum port_type port, u16 read_iir)
{
	u8 *toggle = &(dc->port[port].toggle_ul);

	if (*toggle == 0 && read_iir & MDM_UL1) {
		dc->last_ier &= ~MDM_UL;
		writew(dc->last_ier, dc->reg_ier);
		if (send_data(port, dc)) {
			writew(MDM_UL1, dc->reg_fcr);
			dc->last_ier = dc->last_ier | MDM_UL;
			writew(dc->last_ier, dc->reg_ier);
			*toggle = !*toggle;
		}

		if (read_iir & MDM_UL2) {
			dc->last_ier &= ~MDM_UL;
			writew(dc->last_ier, dc->reg_ier);
			if (send_data(port, dc)) {
				writew(MDM_UL2, dc->reg_fcr);
				dc->last_ier = dc->last_ier | MDM_UL;
				writew(dc->last_ier, dc->reg_ier);
				*toggle = !*toggle;
			}
		}

	} else if (*toggle == 1 && read_iir & MDM_UL2) {
		dc->last_ier &= ~MDM_UL;
		writew(dc->last_ier, dc->reg_ier);
		if (send_data(port, dc)) {
			writew(MDM_UL2, dc->reg_fcr);
			dc->last_ier = dc->last_ier | MDM_UL;
			writew(dc->last_ier, dc->reg_ier);
			*toggle = !*toggle;
		}

		if (read_iir & MDM_UL1) {
			dc->last_ier &= ~MDM_UL;
			writew(dc->last_ier, dc->reg_ier);
			if (send_data(port, dc)) {
				writew(MDM_UL1, dc->reg_fcr);
				dc->last_ier = dc->last_ier | MDM_UL;
				writew(dc->last_ier, dc->reg_ier);
				*toggle = !*toggle;
			}
		}
	} else {
		writew(read_iir & MDM_UL, dc->reg_fcr);
		dev_err(&dc->pdev->dev, "port out of sync!\n");
		return 0;
	}
	return 1;
}

static irqreturn_t interrupt_handler(int irq, void *dev_id)
{
	struct nozomi *dc = dev_id;
	unsigned int a;
	u16 read_iir;

	if (!dc)
		return IRQ_NONE;

	spin_lock(&dc->spin_mutex);
	read_iir = readw(dc->reg_iir);

	/* Card removed */
	if (read_iir == (u16)-1)
		goto none;
	/*
	 * Just handle interrupt enabled in IER
	 * (by masking with dc->last_ier)
	 */
	read_iir &= dc->last_ier;

	if (read_iir == 0)
		goto none;


	DBG4("%s irq:0x%04X, prev:0x%04X", interrupt2str(read_iir), read_iir,
		dc->last_ier);

	if (read_iir & RESET) {
		if (unlikely(!nozomi_read_config_table(dc))) {
			dc->last_ier = 0x0;
			writew(dc->last_ier, dc->reg_ier);
			dev_err(&dc->pdev->dev, "Could not read status from "
				"card, we should disable interface\n");
		} else {
			writew(RESET, dc->reg_fcr);
		}
		/* No more useful info if this was the reset interrupt. */
		goto exit_handler;
	}
	if (read_iir & CTRL_UL) {
		DBG1("CTRL_UL");
		dc->last_ier &= ~CTRL_UL;
		writew(dc->last_ier, dc->reg_ier);
		if (send_flow_control(dc)) {
			writew(CTRL_UL, dc->reg_fcr);
			dc->last_ier = dc->last_ier | CTRL_UL;
			writew(dc->last_ier, dc->reg_ier);
		}
	}
	if (read_iir & CTRL_DL) {
		receive_flow_control(dc);
		writew(CTRL_DL, dc->reg_fcr);
	}
	if (read_iir & MDM_DL) {
		if (!handle_data_dl(dc, PORT_MDM,
				&(dc->port[PORT_MDM].toggle_dl), read_iir,
				MDM_DL1, MDM_DL2)) {
			dev_err(&dc->pdev->dev, "MDM_DL out of sync!\n");
			goto exit_handler;
		}
	}
	if (read_iir & MDM_UL) {
		if (!handle_data_ul(dc, PORT_MDM, read_iir)) {
			dev_err(&dc->pdev->dev, "MDM_UL out of sync!\n");
			goto exit_handler;
		}
	}
	if (read_iir & DIAG_DL) {
		if (!handle_data_dl(dc, PORT_DIAG,
				&(dc->port[PORT_DIAG].toggle_dl), read_iir,
				DIAG_DL1, DIAG_DL2)) {
			dev_err(&dc->pdev->dev, "DIAG_DL out of sync!\n");
			goto exit_handler;
		}
	}
	if (read_iir & DIAG_UL) {
		dc->last_ier &= ~DIAG_UL;
		writew(dc->last_ier, dc->reg_ier);
		if (send_data(PORT_DIAG, dc)) {
			writew(DIAG_UL, dc->reg_fcr);
			dc->last_ier = dc->last_ier | DIAG_UL;
			writew(dc->last_ier, dc->reg_ier);
		}
	}
	if (read_iir & APP1_DL) {
		if (receive_data(PORT_APP1, dc))
			writew(APP1_DL, dc->reg_fcr);
	}
	if (read_iir & APP1_UL) {
		dc->last_ier &= ~APP1_UL;
		writew(dc->last_ier, dc->reg_ier);
		if (send_data(PORT_APP1, dc)) {
			writew(APP1_UL, dc->reg_fcr);
			dc->last_ier = dc->last_ier | APP1_UL;
			writew(dc->last_ier, dc->reg_ier);
		}
	}
	if (read_iir & APP2_DL) {
		if (receive_data(PORT_APP2, dc))
			writew(APP2_DL, dc->reg_fcr);
	}
	if (read_iir & APP2_UL) {
		dc->last_ier &= ~APP2_UL;
		writew(dc->last_ier, dc->reg_ier);
		if (send_data(PORT_APP2, dc)) {
			writew(APP2_UL, dc->reg_fcr);
			dc->last_ier = dc->last_ier | APP2_UL;
			writew(dc->last_ier, dc->reg_ier);
		}
	}

exit_handler:
	spin_unlock(&dc->spin_mutex);
	for (a = 0; a < NOZOMI_MAX_PORTS; a++) {
		struct tty_struct *tty;
		if (test_and_clear_bit(a, &dc->flip)) {
			tty = tty_port_tty_get(&dc->port[a].port);
			if (tty)
				tty_flip_buffer_push(tty);
			tty_kref_put(tty);
		}
	}
	return IRQ_HANDLED;
none:
	spin_unlock(&dc->spin_mutex);
	return IRQ_NONE;
}

static void nozomi_get_card_type(struct nozomi *dc)
{
	int i;
	u32 size = 0;

	for (i = 0; i < 6; i++)
		size += pci_resource_len(dc->pdev, i);

	/* Assume card type F32_8 if no match */
	dc->card_type = size == 2048 ? F32_2 : F32_8;

	dev_info(&dc->pdev->dev, "Card type is: %d\n", dc->card_type);
}

static void nozomi_setup_private_data(struct nozomi *dc)
{
	void __iomem *offset = dc->base_addr + dc->card_type / 2;
	unsigned int i;

	dc->reg_fcr = (void __iomem *)(offset + R_FCR);
	dc->reg_iir = (void __iomem *)(offset + R_IIR);
	dc->reg_ier = (void __iomem *)(offset + R_IER);
	dc->last_ier = 0;
	dc->flip = 0;

	dc->port[PORT_MDM].token_dl = MDM_DL;
	dc->port[PORT_DIAG].token_dl = DIAG_DL;
	dc->port[PORT_APP1].token_dl = APP1_DL;
	dc->port[PORT_APP2].token_dl = APP2_DL;

	for (i = 0; i < MAX_PORT; i++)
		init_waitqueue_head(&dc->port[i].tty_wait);
}

static ssize_t card_type_show(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));

	return sprintf(buf, "%d\n", dc->card_type);
}
static DEVICE_ATTR(card_type, S_IRUGO, card_type_show, NULL);

static ssize_t open_ttys_show(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	const struct nozomi *dc = pci_get_drvdata(to_pci_dev(dev));

	return sprintf(buf, "%u\n", dc->open_ttys);
}
static DEVICE_ATTR(open_ttys, S_IRUGO, open_ttys_show, NULL);

static void make_sysfs_files(struct nozomi *dc)
{
	if (device_create_file(&dc->pdev->dev, &dev_attr_card_type))
		dev_err(&dc->pdev->dev,
			"Could not create sysfs file for card_type\n");
	if (device_create_file(&dc->pdev->dev, &dev_attr_open_ttys))
		dev_err(&dc->pdev->dev,
			"Could not create sysfs file for open_ttys\n");
}

static void remove_sysfs_files(struct nozomi *dc)
{
	device_remove_file(&dc->pdev->dev, &dev_attr_card_type);
	device_remove_file(&dc->pdev->dev, &dev_attr_open_ttys);
}

/* Allocate memory for one device */
static int __devinit nozomi_card_init(struct pci_dev *pdev,
				      const struct pci_device_id *ent)
{
	resource_size_t start;
	int ret;
	struct nozomi *dc = NULL;
	int ndev_idx;
	int i;

	dev_dbg(&pdev->dev, "Init, new card found\n");

	for (ndev_idx = 0; ndev_idx < ARRAY_SIZE(ndevs); ndev_idx++)
		if (!ndevs[ndev_idx])
			break;

	if (ndev_idx >= ARRAY_SIZE(ndevs)) {
		dev_err(&pdev->dev, "no free tty range for this card left\n");
		ret = -EIO;
		goto err;
	}

	dc = kzalloc(sizeof(struct nozomi), GFP_KERNEL);
	if (unlikely(!dc)) {
		dev_err(&pdev->dev, "Could not allocate memory\n");
		ret = -ENOMEM;
		goto err_free;
	}

	dc->pdev = pdev;

	ret = pci_enable_device(dc->pdev);
	if (ret) {
		dev_err(&pdev->dev, "Failed to enable PCI Device\n");
		goto err_free;
	}

	ret = pci_request_regions(dc->pdev, NOZOMI_NAME);
	if (ret) {
		dev_err(&pdev->dev, "I/O address 0x%04x already in use\n",
			(int) /* nozomi_private.io_addr */ 0);
		goto err_disable_device;
	}

	start = pci_resource_start(dc->pdev, 0);
	if (start == 0) {
		dev_err(&pdev->dev, "No I/O address for card detected\n");
		ret = -ENODEV;
		goto err_rel_regs;
	}

	/* Find out what card type it is */
	nozomi_get_card_type(dc);

	dc->base_addr = ioremap_nocache(start, dc->card_type);
	if (!dc->base_addr) {
		dev_err(&pdev->dev, "Unable to map card MMIO\n");
		ret = -ENODEV;
		goto err_rel_regs;
	}

	dc->send_buf = kmalloc(SEND_BUF_MAX, GFP_KERNEL);
	if (!dc->send_buf) {
		dev_err(&pdev->dev, "Could not allocate send buffer?\n");
		ret = -ENOMEM;
		goto err_free_sbuf;
	}

	for (i = PORT_MDM; i < MAX_PORT; i++) {
		if (kfifo_alloc(&dc->port[i].fifo_ul,
		      FIFO_BUFFER_SIZE_UL, GFP_ATOMIC)) {
			dev_err(&pdev->dev,
					"Could not allocate kfifo buffer\n");
			ret = -ENOMEM;
			goto err_free_kfifo;
		}
	}

	spin_lock_init(&dc->spin_mutex);

	nozomi_setup_private_data(dc);

	/* Disable all interrupts */
	dc->last_ier = 0;
	writew(dc->last_ier, dc->reg_ier);

	ret = request_irq(pdev->irq, &interrupt_handler, IRQF_SHARED,
			NOZOMI_NAME, dc);
	if (unlikely(ret)) {
		dev_err(&pdev->dev, "can't request irq %d\n", pdev->irq);
		goto err_free_kfifo;
	}

	DBG1("base_addr: %p", dc->base_addr);

	make_sysfs_files(dc);

	dc->index_start = ndev_idx * MAX_PORT;
	ndevs[ndev_idx] = dc;

	pci_set_drvdata(pdev, dc);

	/* Enable RESET interrupt */
	dc->last_ier = RESET;
	iowrite16(dc->last_ier, dc->reg_ier);

	dc->state = NOZOMI_STATE_ENABLED;

	for (i = 0; i < MAX_PORT; i++) {
		struct device *tty_dev;

		mutex_init(&dc->port[i].tty_sem);
		tty_port_init(&dc->port[i].port);
		tty_dev = tty_register_device(ntty_driver, dc->index_start + i,
							&pdev->dev);

		if (IS_ERR(tty_dev)) {
			ret = PTR_ERR(tty_dev);
			dev_err(&pdev->dev, "Could not allocate tty?\n");
			goto err_free_tty;
		}
	}

	return 0;

err_free_tty:
	for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
		tty_unregister_device(ntty_driver, i);
err_free_kfifo:
	for (i = 0; i < MAX_PORT; i++)
		kfifo_free(&dc->port[i].fifo_ul);
err_free_sbuf:
	kfree(dc->send_buf);
	iounmap(dc->base_addr);
err_rel_regs:
	pci_release_regions(pdev);
err_disable_device:
	pci_disable_device(pdev);
err_free:
	kfree(dc);
err:
	return ret;
}

static void __devexit tty_exit(struct nozomi *dc)
{
	unsigned int i;

	DBG1(" ");

	flush_scheduled_work();

	for (i = 0; i < MAX_PORT; ++i) {
		struct tty_struct *tty = tty_port_tty_get(&dc->port[i].port);
		if (tty && list_empty(&tty->hangup_work.entry))
			tty_hangup(tty);
		tty_kref_put(tty);
	}
	/* Racy below - surely should wait for scheduled work to be done or
	   complete off a hangup method ? */
	while (dc->open_ttys)
		msleep(1);
	for (i = dc->index_start; i < dc->index_start + MAX_PORT; ++i)
		tty_unregister_device(ntty_driver, i);
}

/* Deallocate memory for one device */
static void __devexit nozomi_card_exit(struct pci_dev *pdev)
{
	int i;
	struct ctrl_ul ctrl;
	struct nozomi *dc = pci_get_drvdata(pdev);

	/* Disable all interrupts */
	dc->last_ier = 0;
	writew(dc->last_ier, dc->reg_ier);

	tty_exit(dc);

	/* Send 0x0001, command card to resend the reset token.  */
	/* This is to get the reset when the module is reloaded. */
	ctrl.port = 0x00;
	ctrl.reserved = 0;
	ctrl.RTS = 0;
	ctrl.DTR = 1;
	DBG1("sending flow control 0x%04X", *((u16 *)&ctrl));

	/* Setup dc->reg addresses to we can use defines here */
	write_mem32(dc->port[PORT_CTRL].ul_addr[0], (u32 *)&ctrl, 2);
	writew(CTRL_UL, dc->reg_fcr);	/* push the token to the card. */

	remove_sysfs_files(dc);

	free_irq(pdev->irq, dc);

	for (i = 0; i < MAX_PORT; i++)
		kfifo_free(&dc->port[i].fifo_ul);

	kfree(dc->send_buf);

	iounmap(dc->base_addr);

	pci_release_regions(pdev);

	pci_disable_device(pdev);

	ndevs[dc->index_start / MAX_PORT] = NULL;

	kfree(dc);
}

static void set_rts(const struct tty_struct *tty, int rts)
{
	struct port *port = get_port_by_tty(tty);

	port->ctrl_ul.RTS = rts;
	port->update_flow_control = 1;
	enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
}

static void set_dtr(const struct tty_struct *tty, int dtr)
{
	struct port *port = get_port_by_tty(tty);

	DBG1("SETTING DTR index: %d, dtr: %d", tty->index, dtr);

	port->ctrl_ul.DTR = dtr;
	port->update_flow_control = 1;
	enable_transmit_ul(PORT_CTRL, get_dc_by_tty(tty));
}

/*
 * ----------------------------------------------------------------------------
 * TTY code
 * ----------------------------------------------------------------------------
 */

/* Called when the userspace process opens the tty, /dev/noz*.  */
static int ntty_open(struct tty_struct *tty, struct file *file)
{
	struct port *port = get_port_by_tty(tty);
	struct nozomi *dc = get_dc_by_tty(tty);
	unsigned long flags;

	if (!port || !dc || dc->state != NOZOMI_STATE_READY)
		return -ENODEV;

	if (mutex_lock_interruptible(&port->tty_sem))
		return -ERESTARTSYS;

	port->port.count++;
	dc->open_ttys++;

	/* Enable interrupt downlink for channel */
	if (port->port.count == 1) {
		tty->driver_data = port;
		tty_port_tty_set(&port->port, tty);
		DBG1("open: %d", port->token_dl);
		spin_lock_irqsave(&dc->spin_mutex, flags);
		dc->last_ier = dc->last_ier | port->token_dl;
		writew(dc->last_ier, dc->reg_ier);
		spin_unlock_irqrestore(&dc->spin_mutex, flags);
	}
	mutex_unlock(&port->tty_sem);
	return 0;
}

/* Called when the userspace process close the tty, /dev/noz*. Also
   called immediately if ntty_open fails in which case tty->driver_data
   will be NULL an we exit by the first return */

static void ntty_close(struct tty_struct *tty, struct file *file)
{
	struct nozomi *dc = get_dc_by_tty(tty);
	struct port *nport = tty->driver_data;
	struct tty_port *port = &nport->port;
	unsigned long flags;

	if (!dc || !nport)
		return;

	/* Users cannot interrupt a close */
	mutex_lock(&nport->tty_sem);

	WARN_ON(!port->count);

	dc->open_ttys--;
	port->count--;

	if (port->count == 0) {
		DBG1("close: %d", nport->token_dl);
		tty_port_tty_set(port, NULL);
		spin_lock_irqsave(&dc->spin_mutex, flags);
		dc->last_ier &= ~(nport->token_dl);
		writew(dc->last_ier, dc->reg_ier);
		spin_unlock_irqrestore(&dc->spin_mutex, flags);
	}
	mutex_unlock(&nport->tty_sem);
}

/*
 * called when the userspace process writes to the tty (/dev/noz*).
 * Data is inserted into a fifo, which is then read and transfered to the modem.
 */
static int ntty_write(struct tty_struct *tty, const unsigned char *buffer,
		      int count)
{
	int rval = -EINVAL;
	struct nozomi *dc = get_dc_by_tty(tty);
	struct port *port = tty->driver_data;
	unsigned long flags;

	/* DBG1( "WRITEx: %d, index = %d", count, index); */

	if (!dc || !port)
		return -ENODEV;

	if (unlikely(!mutex_trylock(&port->tty_sem))) {
		/*
		 * must test lock as tty layer wraps calls
		 * to this function with BKL
		 */
		dev_err(&dc->pdev->dev, "Would have deadlocked - "
			"return EAGAIN\n");
		return -EAGAIN;
	}

	if (unlikely(!port->port.count)) {
		DBG1(" ");
		goto exit;
	}

	rval = kfifo_in(&port->fifo_ul, (unsigned char *)buffer, count);

	/* notify card */
	if (unlikely(dc == NULL)) {
		DBG1("No device context?");
		goto exit;
	}

	spin_lock_irqsave(&dc->spin_mutex, flags);
	/* CTS is only valid on the modem channel */
	if (port == &(dc->port[PORT_MDM])) {
		if (port->ctrl_dl.CTS) {
			DBG4("Enable interrupt");
			enable_transmit_ul(tty->index % MAX_PORT, dc);
		} else {
			dev_err(&dc->pdev->dev,
				"CTS not active on modem port?\n");
		}
	} else {
		enable_transmit_ul(tty->index % MAX_PORT, dc);
	}
	spin_unlock_irqrestore(&dc->spin_mutex, flags);

exit:
	mutex_unlock(&port->tty_sem);
	return rval;
}

/*
 * Calculate how much is left in device
 * This method is called by the upper tty layer.
 *   #according to sources N_TTY.c it expects a value >= 0 and
 *    does not check for negative values.
 */
static int ntty_write_room(struct tty_struct *tty)
{
	struct port *port = tty->driver_data;
	int room = 0;
	const struct nozomi *dc = get_dc_by_tty(tty);

	if (!dc || !port)
		return 0;
	if (!mutex_trylock(&port->tty_sem))
		return 0;

	if (!port->port.count)
		goto exit;

	room = port->fifo_ul.size - kfifo_len(&port->fifo_ul);

exit:
	mutex_unlock(&port->tty_sem);
	return room;
}

/* Gets io control parameters */
static int ntty_tiocmget(struct tty_struct *tty, struct file *file)
{
	const struct port *port = tty->driver_data;
	const struct ctrl_dl *ctrl_dl = &port->ctrl_dl;
	const struct ctrl_ul *ctrl_ul = &port->ctrl_ul;

	/* Note: these could change under us but it is not clear this
	   matters if so */
	return	(ctrl_ul->RTS ? TIOCM_RTS : 0) |
		(ctrl_ul->DTR ? TIOCM_DTR : 0) |
		(ctrl_dl->DCD ? TIOCM_CAR : 0) |
		(ctrl_dl->RI  ? TIOCM_RNG : 0) |
		(ctrl_dl->DSR ? TIOCM_DSR : 0) |
		(ctrl_dl->CTS ? TIOCM_CTS : 0);
}

/* Sets io controls parameters */
static int ntty_tiocmset(struct tty_struct *tty, struct file *file,
	unsigned int set, unsigned int clear)
{
	struct nozomi *dc = get_dc_by_tty(tty);
	unsigned long flags;

	spin_lock_irqsave(&dc->spin_mutex, flags);
	if (set & TIOCM_RTS)
		set_rts(tty, 1);
	else if (clear & TIOCM_RTS)
		set_rts(tty, 0);

	if (set & TIOCM_DTR)
		set_dtr(tty, 1);
	else if (clear & TIOCM_DTR)
		set_dtr(tty, 0);
	spin_unlock_irqrestore(&dc->spin_mutex, flags);

	return 0;
}

static int ntty_cflags_changed(struct port *port, unsigned long flags,
		struct async_icount *cprev)
{
	const struct async_icount cnow = port->tty_icount;
	int ret;

	ret =	((flags & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
		((flags & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
		((flags & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
		((flags & TIOCM_CTS) && (cnow.cts != cprev->cts));

	*cprev = cnow;

	return ret;
}

static int ntty_ioctl_tiocgicount(struct port *port, void __user *argp)
{
	const struct async_icount cnow = port->tty_icount;
	struct serial_icounter_struct icount;

	icount.cts = cnow.cts;
	icount.dsr = cnow.dsr;
	icount.rng = cnow.rng;
	icount.dcd = cnow.dcd;
	icount.rx = cnow.rx;
	icount.tx = cnow.tx;
	icount.frame = cnow.frame;
	icount.overrun = cnow.overrun;
	icount.parity = cnow.parity;
	icount.brk = cnow.brk;
	icount.buf_overrun = cnow.buf_overrun;

	return copy_to_user(argp, &icount, sizeof(icount)) ? -EFAULT : 0;
}

static int ntty_ioctl(struct tty_struct *tty, struct file *file,
		      unsigned int cmd, unsigned long arg)
{
	struct port *port = tty->driver_data;
	void __user *argp = (void __user *)arg;
	int rval = -ENOIOCTLCMD;

	DBG1("******** IOCTL, cmd: %d", cmd);

	switch (cmd) {
	case TIOCMIWAIT: {
		struct async_icount cprev = port->tty_icount;

		rval = wait_event_interruptible(port->tty_wait,
				ntty_cflags_changed(port, arg, &cprev));
		break;
	} case TIOCGICOUNT:
		rval = ntty_ioctl_tiocgicount(port, argp);
		break;
	default:
		DBG1("ERR: 0x%08X, %d", cmd, cmd);
		break;
	};

	return rval;
}

/*
 * Called by the upper tty layer when tty buffers are ready
 * to receive data again after a call to throttle.
 */
static void ntty_unthrottle(struct tty_struct *tty)
{
	struct nozomi *dc = get_dc_by_tty(tty);
	unsigned long flags;

	DBG1("UNTHROTTLE");
	spin_lock_irqsave(&dc->spin_mutex, flags);
	enable_transmit_dl(tty->index % MAX_PORT, dc);
	set_rts(tty, 1);

	spin_unlock_irqrestore(&dc->spin_mutex, flags);
}

/*
 * Called by the upper tty layer when the tty buffers are almost full.
 * The driver should stop send more data.
 */
static void ntty_throttle(struct tty_struct *tty)
{
	struct nozomi *dc = get_dc_by_tty(tty);
	unsigned long flags;

	DBG1("THROTTLE");
	spin_lock_irqsave(&dc->spin_mutex, flags);
	set_rts(tty, 0);
	spin_unlock_irqrestore(&dc->spin_mutex, flags);
}

/* Returns number of chars in buffer, called by tty layer */
static s32 ntty_chars_in_buffer(struct tty_struct *tty)
{
	struct port *port = tty->driver_data;
	struct nozomi *dc = get_dc_by_tty(tty);
	s32 rval = 0;

	if (unlikely(!dc || !port)) {
		goto exit_in_buffer;
	}

	if (unlikely(!port->port.count)) {
		dev_err(&dc->pdev->dev, "No tty open?\n");
		goto exit_in_buffer;
	}

	rval = kfifo_len(&port->fifo_ul);

exit_in_buffer:
	return rval;
}

static const struct tty_operations tty_ops = {
	.ioctl = ntty_ioctl,
	.open = ntty_open,
	.close = ntty_close,
	.write = ntty_write,
	.write_room = ntty_write_room,
	.unthrottle = ntty_unthrottle,
	.throttle = ntty_throttle,
	.chars_in_buffer = ntty_chars_in_buffer,
	.tiocmget = ntty_tiocmget,
	.tiocmset = ntty_tiocmset,
};

/* Module initialization */
static struct pci_driver nozomi_driver = {
	.name = NOZOMI_NAME,
	.id_table = nozomi_pci_tbl,
	.probe = nozomi_card_init,
	.remove = __devexit_p(nozomi_card_exit),
};

static __init int nozomi_init(void)
{
	int ret;

	printk(KERN_INFO "Initializing %s\n", VERSION_STRING);

	ntty_driver = alloc_tty_driver(NTTY_TTY_MAXMINORS);
	if (!ntty_driver)
		return -ENOMEM;

	ntty_driver->owner = THIS_MODULE;
	ntty_driver->driver_name = NOZOMI_NAME_TTY;
	ntty_driver->name = "noz";
	ntty_driver->major = 0;
	ntty_driver->type = TTY_DRIVER_TYPE_SERIAL;
	ntty_driver->subtype = SERIAL_TYPE_NORMAL;
	ntty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
	ntty_driver->init_termios = tty_std_termios;
	ntty_driver->init_termios.c_cflag = B115200 | CS8 | CREAD | \
						HUPCL | CLOCAL;
	ntty_driver->init_termios.c_ispeed = 115200;
	ntty_driver->init_termios.c_ospeed = 115200;
	tty_set_operations(ntty_driver, &tty_ops);

	ret = tty_register_driver(ntty_driver);
	if (ret) {
		printk(KERN_ERR "Nozomi: failed to register ntty driver\n");
		goto free_tty;
	}

	ret = pci_register_driver(&nozomi_driver);
	if (ret) {
		printk(KERN_ERR "Nozomi: can't register pci driver\n");
		goto unr_tty;
	}

	return 0;
unr_tty:
	tty_unregister_driver(ntty_driver);
free_tty:
	put_tty_driver(ntty_driver);
	return ret;
}

static __exit void nozomi_exit(void)
{
	printk(KERN_INFO "Unloading %s\n", DRIVER_DESC);
	pci_unregister_driver(&nozomi_driver);
	tty_unregister_driver(ntty_driver);
	put_tty_driver(ntty_driver);
}

module_init(nozomi_init);
module_exit(nozomi_exit);

module_param(debug, int, S_IRUGO | S_IWUSR);

MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION(DRIVER_DESC);