summaryrefslogtreecommitdiff
path: root/drivers/tty/serial/pch_uart.c
blob: 52379e56a31e7abc43a6642a799b1be7744be6c8 (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
/*
 *Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
 *
 *This program is free software; you can redistribute it and/or modify
 *it under the terms of the GNU General Public License as published by
 *the Free Software Foundation; version 2 of the License.
 *
 *This program is distributed in the hope that it will be useful,
 *but WITHOUT ANY WARRANTY; without even the implied warranty of
 *MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *GNU General Public License for more details.
 *
 *You should have received a copy of the GNU General Public License
 *along with this program; if not, write to the Free Software
 *Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
 */
#if defined(CONFIG_SERIAL_PCH_UART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/kernel.h>
#include <linux/serial_reg.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/console.h>
#include <linux/serial_core.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/dmi.h>
#include <linux/nmi.h>
#include <linux/delay.h>

#include <linux/debugfs.h>
#include <linux/dmaengine.h>
#include <linux/pch_dma.h>

enum {
	PCH_UART_HANDLED_RX_INT_SHIFT,
	PCH_UART_HANDLED_TX_INT_SHIFT,
	PCH_UART_HANDLED_RX_ERR_INT_SHIFT,
	PCH_UART_HANDLED_RX_TRG_INT_SHIFT,
	PCH_UART_HANDLED_MS_INT_SHIFT,
	PCH_UART_HANDLED_LS_INT_SHIFT,
};

enum {
	PCH_UART_8LINE,
	PCH_UART_2LINE,
};

#define PCH_UART_DRIVER_DEVICE "ttyPCH"

/* Set the max number of UART port
 * Intel EG20T PCH: 4 port
 * LAPIS Semiconductor ML7213 IOH: 3 port
 * LAPIS Semiconductor ML7223 IOH: 2 port
*/
#define PCH_UART_NR	4

#define PCH_UART_HANDLED_RX_INT	(1<<((PCH_UART_HANDLED_RX_INT_SHIFT)<<1))
#define PCH_UART_HANDLED_TX_INT	(1<<((PCH_UART_HANDLED_TX_INT_SHIFT)<<1))
#define PCH_UART_HANDLED_RX_ERR_INT	(1<<((\
					PCH_UART_HANDLED_RX_ERR_INT_SHIFT)<<1))
#define PCH_UART_HANDLED_RX_TRG_INT	(1<<((\
					PCH_UART_HANDLED_RX_TRG_INT_SHIFT)<<1))
#define PCH_UART_HANDLED_MS_INT	(1<<((PCH_UART_HANDLED_MS_INT_SHIFT)<<1))

#define PCH_UART_HANDLED_LS_INT	(1<<((PCH_UART_HANDLED_LS_INT_SHIFT)<<1))

#define PCH_UART_RBR		0x00
#define PCH_UART_THR		0x00

#define PCH_UART_IER_MASK	(PCH_UART_IER_ERBFI|PCH_UART_IER_ETBEI|\
				PCH_UART_IER_ELSI|PCH_UART_IER_EDSSI)
#define PCH_UART_IER_ERBFI	0x00000001
#define PCH_UART_IER_ETBEI	0x00000002
#define PCH_UART_IER_ELSI	0x00000004
#define PCH_UART_IER_EDSSI	0x00000008

#define PCH_UART_IIR_IP			0x00000001
#define PCH_UART_IIR_IID		0x00000006
#define PCH_UART_IIR_MSI		0x00000000
#define PCH_UART_IIR_TRI		0x00000002
#define PCH_UART_IIR_RRI		0x00000004
#define PCH_UART_IIR_REI		0x00000006
#define PCH_UART_IIR_TOI		0x00000008
#define PCH_UART_IIR_FIFO256		0x00000020
#define PCH_UART_IIR_FIFO64		PCH_UART_IIR_FIFO256
#define PCH_UART_IIR_FE			0x000000C0

#define PCH_UART_FCR_FIFOE		0x00000001
#define PCH_UART_FCR_RFR		0x00000002
#define PCH_UART_FCR_TFR		0x00000004
#define PCH_UART_FCR_DMS		0x00000008
#define PCH_UART_FCR_FIFO256		0x00000020
#define PCH_UART_FCR_RFTL		0x000000C0

#define PCH_UART_FCR_RFTL1		0x00000000
#define PCH_UART_FCR_RFTL64		0x00000040
#define PCH_UART_FCR_RFTL128		0x00000080
#define PCH_UART_FCR_RFTL224		0x000000C0
#define PCH_UART_FCR_RFTL16		PCH_UART_FCR_RFTL64
#define PCH_UART_FCR_RFTL32		PCH_UART_FCR_RFTL128
#define PCH_UART_FCR_RFTL56		PCH_UART_FCR_RFTL224
#define PCH_UART_FCR_RFTL4		PCH_UART_FCR_RFTL64
#define PCH_UART_FCR_RFTL8		PCH_UART_FCR_RFTL128
#define PCH_UART_FCR_RFTL14		PCH_UART_FCR_RFTL224
#define PCH_UART_FCR_RFTL_SHIFT		6

#define PCH_UART_LCR_WLS	0x00000003
#define PCH_UART_LCR_STB	0x00000004
#define PCH_UART_LCR_PEN	0x00000008
#define PCH_UART_LCR_EPS	0x00000010
#define PCH_UART_LCR_SP		0x00000020
#define PCH_UART_LCR_SB		0x00000040
#define PCH_UART_LCR_DLAB	0x00000080
#define PCH_UART_LCR_NP		0x00000000
#define PCH_UART_LCR_OP		PCH_UART_LCR_PEN
#define PCH_UART_LCR_EP		(PCH_UART_LCR_PEN | PCH_UART_LCR_EPS)
#define PCH_UART_LCR_1P		(PCH_UART_LCR_PEN | PCH_UART_LCR_SP)
#define PCH_UART_LCR_0P		(PCH_UART_LCR_PEN | PCH_UART_LCR_EPS |\
				PCH_UART_LCR_SP)

#define PCH_UART_LCR_5BIT	0x00000000
#define PCH_UART_LCR_6BIT	0x00000001
#define PCH_UART_LCR_7BIT	0x00000002
#define PCH_UART_LCR_8BIT	0x00000003

#define PCH_UART_MCR_DTR	0x00000001
#define PCH_UART_MCR_RTS	0x00000002
#define PCH_UART_MCR_OUT	0x0000000C
#define PCH_UART_MCR_LOOP	0x00000010
#define PCH_UART_MCR_AFE	0x00000020

#define PCH_UART_LSR_DR		0x00000001
#define PCH_UART_LSR_ERR	(1<<7)

#define PCH_UART_MSR_DCTS	0x00000001
#define PCH_UART_MSR_DDSR	0x00000002
#define PCH_UART_MSR_TERI	0x00000004
#define PCH_UART_MSR_DDCD	0x00000008
#define PCH_UART_MSR_CTS	0x00000010
#define PCH_UART_MSR_DSR	0x00000020
#define PCH_UART_MSR_RI		0x00000040
#define PCH_UART_MSR_DCD	0x00000080
#define PCH_UART_MSR_DELTA	(PCH_UART_MSR_DCTS | PCH_UART_MSR_DDSR |\
				PCH_UART_MSR_TERI | PCH_UART_MSR_DDCD)

#define PCH_UART_DLL		0x00
#define PCH_UART_DLM		0x01

#define PCH_UART_BRCSR		0x0E

#define PCH_UART_IID_RLS	(PCH_UART_IIR_REI)
#define PCH_UART_IID_RDR	(PCH_UART_IIR_RRI)
#define PCH_UART_IID_RDR_TO	(PCH_UART_IIR_RRI | PCH_UART_IIR_TOI)
#define PCH_UART_IID_THRE	(PCH_UART_IIR_TRI)
#define PCH_UART_IID_MS		(PCH_UART_IIR_MSI)

#define PCH_UART_HAL_PARITY_NONE	(PCH_UART_LCR_NP)
#define PCH_UART_HAL_PARITY_ODD		(PCH_UART_LCR_OP)
#define PCH_UART_HAL_PARITY_EVEN	(PCH_UART_LCR_EP)
#define PCH_UART_HAL_PARITY_FIX1	(PCH_UART_LCR_1P)
#define PCH_UART_HAL_PARITY_FIX0	(PCH_UART_LCR_0P)
#define PCH_UART_HAL_5BIT		(PCH_UART_LCR_5BIT)
#define PCH_UART_HAL_6BIT		(PCH_UART_LCR_6BIT)
#define PCH_UART_HAL_7BIT		(PCH_UART_LCR_7BIT)
#define PCH_UART_HAL_8BIT		(PCH_UART_LCR_8BIT)
#define PCH_UART_HAL_STB1		0
#define PCH_UART_HAL_STB2		(PCH_UART_LCR_STB)

#define PCH_UART_HAL_CLR_TX_FIFO	(PCH_UART_FCR_TFR)
#define PCH_UART_HAL_CLR_RX_FIFO	(PCH_UART_FCR_RFR)
#define PCH_UART_HAL_CLR_ALL_FIFO	(PCH_UART_HAL_CLR_TX_FIFO | \
					PCH_UART_HAL_CLR_RX_FIFO)

#define PCH_UART_HAL_DMA_MODE0		0
#define PCH_UART_HAL_FIFO_DIS		0
#define PCH_UART_HAL_FIFO16		(PCH_UART_FCR_FIFOE)
#define PCH_UART_HAL_FIFO256		(PCH_UART_FCR_FIFOE | \
					PCH_UART_FCR_FIFO256)
#define PCH_UART_HAL_FIFO64		(PCH_UART_HAL_FIFO256)
#define PCH_UART_HAL_TRIGGER1		(PCH_UART_FCR_RFTL1)
#define PCH_UART_HAL_TRIGGER64		(PCH_UART_FCR_RFTL64)
#define PCH_UART_HAL_TRIGGER128		(PCH_UART_FCR_RFTL128)
#define PCH_UART_HAL_TRIGGER224		(PCH_UART_FCR_RFTL224)
#define PCH_UART_HAL_TRIGGER16		(PCH_UART_FCR_RFTL16)
#define PCH_UART_HAL_TRIGGER32		(PCH_UART_FCR_RFTL32)
#define PCH_UART_HAL_TRIGGER56		(PCH_UART_FCR_RFTL56)
#define PCH_UART_HAL_TRIGGER4		(PCH_UART_FCR_RFTL4)
#define PCH_UART_HAL_TRIGGER8		(PCH_UART_FCR_RFTL8)
#define PCH_UART_HAL_TRIGGER14		(PCH_UART_FCR_RFTL14)
#define PCH_UART_HAL_TRIGGER_L		(PCH_UART_FCR_RFTL64)
#define PCH_UART_HAL_TRIGGER_M		(PCH_UART_FCR_RFTL128)
#define PCH_UART_HAL_TRIGGER_H		(PCH_UART_FCR_RFTL224)

#define PCH_UART_HAL_RX_INT		(PCH_UART_IER_ERBFI)
#define PCH_UART_HAL_TX_INT		(PCH_UART_IER_ETBEI)
#define PCH_UART_HAL_RX_ERR_INT		(PCH_UART_IER_ELSI)
#define PCH_UART_HAL_MS_INT		(PCH_UART_IER_EDSSI)
#define PCH_UART_HAL_ALL_INT		(PCH_UART_IER_MASK)

#define PCH_UART_HAL_DTR		(PCH_UART_MCR_DTR)
#define PCH_UART_HAL_RTS		(PCH_UART_MCR_RTS)
#define PCH_UART_HAL_OUT		(PCH_UART_MCR_OUT)
#define PCH_UART_HAL_LOOP		(PCH_UART_MCR_LOOP)
#define PCH_UART_HAL_AFE		(PCH_UART_MCR_AFE)

#define PCI_VENDOR_ID_ROHM		0x10DB

#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)

#define DEFAULT_UARTCLK   1843200 /*   1.8432 MHz */
#define CMITC_UARTCLK   192000000 /* 192.0000 MHz */
#define FRI2_64_UARTCLK  64000000 /*  64.0000 MHz */
#define FRI2_48_UARTCLK  48000000 /*  48.0000 MHz */
#define NTC1_UARTCLK     64000000 /*  64.0000 MHz */
#define MINNOW_UARTCLK   50000000 /*  50.0000 MHz */

struct pch_uart_buffer {
	unsigned char *buf;
	int size;
};

struct eg20t_port {
	struct uart_port port;
	int port_type;
	void __iomem *membase;
	resource_size_t mapbase;
	unsigned int iobase;
	struct pci_dev *pdev;
	int fifo_size;
	unsigned int uartclk;
	int start_tx;
	int start_rx;
	int tx_empty;
	int trigger;
	int trigger_level;
	struct pch_uart_buffer rxbuf;
	unsigned int dmsr;
	unsigned int fcr;
	unsigned int mcr;
	unsigned int use_dma;
	struct dma_async_tx_descriptor	*desc_tx;
	struct dma_async_tx_descriptor	*desc_rx;
	struct pch_dma_slave		param_tx;
	struct pch_dma_slave		param_rx;
	struct dma_chan			*chan_tx;
	struct dma_chan			*chan_rx;
	struct scatterlist		*sg_tx_p;
	int				nent;
	struct scatterlist		sg_rx;
	int				tx_dma_use;
	void				*rx_buf_virt;
	dma_addr_t			rx_buf_dma;

	struct dentry	*debugfs;

	/* protect the eg20t_port private structure and io access to membase */
	spinlock_t lock;
};

/**
 * struct pch_uart_driver_data - private data structure for UART-DMA
 * @port_type:			The number of DMA channel
 * @line_no:			UART port line number (0, 1, 2...)
 */
struct pch_uart_driver_data {
	int port_type;
	int line_no;
};

enum pch_uart_num_t {
	pch_et20t_uart0 = 0,
	pch_et20t_uart1,
	pch_et20t_uart2,
	pch_et20t_uart3,
	pch_ml7213_uart0,
	pch_ml7213_uart1,
	pch_ml7213_uart2,
	pch_ml7223_uart0,
	pch_ml7223_uart1,
	pch_ml7831_uart0,
	pch_ml7831_uart1,
};

static struct pch_uart_driver_data drv_dat[] = {
	[pch_et20t_uart0] = {PCH_UART_8LINE, 0},
	[pch_et20t_uart1] = {PCH_UART_2LINE, 1},
	[pch_et20t_uart2] = {PCH_UART_2LINE, 2},
	[pch_et20t_uart3] = {PCH_UART_2LINE, 3},
	[pch_ml7213_uart0] = {PCH_UART_8LINE, 0},
	[pch_ml7213_uart1] = {PCH_UART_2LINE, 1},
	[pch_ml7213_uart2] = {PCH_UART_2LINE, 2},
	[pch_ml7223_uart0] = {PCH_UART_8LINE, 0},
	[pch_ml7223_uart1] = {PCH_UART_2LINE, 1},
	[pch_ml7831_uart0] = {PCH_UART_8LINE, 0},
	[pch_ml7831_uart1] = {PCH_UART_2LINE, 1},
};

#ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
static struct eg20t_port *pch_uart_ports[PCH_UART_NR];
#endif
static unsigned int default_baud = 9600;
static unsigned int user_uartclk = 0;
static const int trigger_level_256[4] = { 1, 64, 128, 224 };
static const int trigger_level_64[4] = { 1, 16, 32, 56 };
static const int trigger_level_16[4] = { 1, 4, 8, 14 };
static const int trigger_level_1[4] = { 1, 1, 1, 1 };

#ifdef CONFIG_DEBUG_FS

#define PCH_REGS_BUFSIZE	1024


static ssize_t port_show_regs(struct file *file, char __user *user_buf,
				size_t count, loff_t *ppos)
{
	struct eg20t_port *priv = file->private_data;
	char *buf;
	u32 len = 0;
	ssize_t ret;
	unsigned char lcr;

	buf = kzalloc(PCH_REGS_BUFSIZE, GFP_KERNEL);
	if (!buf)
		return 0;

	len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
			"PCH EG20T port[%d] regs:\n", priv->port.line);

	len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
			"=================================\n");
	len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
			"IER: \t0x%02x\n", ioread8(priv->membase + UART_IER));
	len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
			"IIR: \t0x%02x\n", ioread8(priv->membase + UART_IIR));
	len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
			"LCR: \t0x%02x\n", ioread8(priv->membase + UART_LCR));
	len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
			"MCR: \t0x%02x\n", ioread8(priv->membase + UART_MCR));
	len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
			"LSR: \t0x%02x\n", ioread8(priv->membase + UART_LSR));
	len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
			"MSR: \t0x%02x\n", ioread8(priv->membase + UART_MSR));
	len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
			"BRCSR: \t0x%02x\n",
			ioread8(priv->membase + PCH_UART_BRCSR));

	lcr = ioread8(priv->membase + UART_LCR);
	iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR);
	len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
			"DLL: \t0x%02x\n", ioread8(priv->membase + UART_DLL));
	len += snprintf(buf + len, PCH_REGS_BUFSIZE - len,
			"DLM: \t0x%02x\n", ioread8(priv->membase + UART_DLM));
	iowrite8(lcr, priv->membase + UART_LCR);

	if (len > PCH_REGS_BUFSIZE)
		len = PCH_REGS_BUFSIZE;

	ret =  simple_read_from_buffer(user_buf, count, ppos, buf, len);
	kfree(buf);
	return ret;
}

static const struct file_operations port_regs_ops = {
	.owner		= THIS_MODULE,
	.open		= simple_open,
	.read		= port_show_regs,
	.llseek		= default_llseek,
};
#endif	/* CONFIG_DEBUG_FS */

static struct dmi_system_id pch_uart_dmi_table[] = {
	{
		.ident = "CM-iTC",
		{
			DMI_MATCH(DMI_BOARD_NAME, "CM-iTC"),
		},
		(void *)CMITC_UARTCLK,
	},
	{
		.ident = "FRI2",
		{
			DMI_MATCH(DMI_BIOS_VERSION, "FRI2"),
		},
		(void *)FRI2_64_UARTCLK,
	},
	{
		.ident = "Fish River Island II",
		{
			DMI_MATCH(DMI_PRODUCT_NAME, "Fish River Island II"),
		},
		(void *)FRI2_48_UARTCLK,
	},
	{
		.ident = "COMe-mTT",
		{
			DMI_MATCH(DMI_BOARD_NAME, "COMe-mTT"),
		},
		(void *)NTC1_UARTCLK,
	},
	{
		.ident = "nanoETXexpress-TT",
		{
			DMI_MATCH(DMI_BOARD_NAME, "nanoETXexpress-TT"),
		},
		(void *)NTC1_UARTCLK,
	},
	{
		.ident = "MinnowBoard",
		{
			DMI_MATCH(DMI_BOARD_NAME, "MinnowBoard"),
		},
		(void *)MINNOW_UARTCLK,
	},
};

/* Return UART clock, checking for board specific clocks. */
static unsigned int pch_uart_get_uartclk(void)
{
	const struct dmi_system_id *d;

	if (user_uartclk)
		return user_uartclk;

	d = dmi_first_match(pch_uart_dmi_table);
	if (d)
		return (unsigned long)d->driver_data;

	return DEFAULT_UARTCLK;
}

static void pch_uart_hal_enable_interrupt(struct eg20t_port *priv,
					  unsigned int flag)
{
	u8 ier = ioread8(priv->membase + UART_IER);
	ier |= flag & PCH_UART_IER_MASK;
	iowrite8(ier, priv->membase + UART_IER);
}

static void pch_uart_hal_disable_interrupt(struct eg20t_port *priv,
					   unsigned int flag)
{
	u8 ier = ioread8(priv->membase + UART_IER);
	ier &= ~(flag & PCH_UART_IER_MASK);
	iowrite8(ier, priv->membase + UART_IER);
}

static int pch_uart_hal_set_line(struct eg20t_port *priv, unsigned int baud,
				 unsigned int parity, unsigned int bits,
				 unsigned int stb)
{
	unsigned int dll, dlm, lcr;
	int div;

	div = DIV_ROUND_CLOSEST(priv->uartclk / 16, baud);
	if (div < 0 || USHRT_MAX <= div) {
		dev_err(priv->port.dev, "Invalid Baud(div=0x%x)\n", div);
		return -EINVAL;
	}

	dll = (unsigned int)div & 0x00FFU;
	dlm = ((unsigned int)div >> 8) & 0x00FFU;

	if (parity & ~(PCH_UART_LCR_PEN | PCH_UART_LCR_EPS | PCH_UART_LCR_SP)) {
		dev_err(priv->port.dev, "Invalid parity(0x%x)\n", parity);
		return -EINVAL;
	}

	if (bits & ~PCH_UART_LCR_WLS) {
		dev_err(priv->port.dev, "Invalid bits(0x%x)\n", bits);
		return -EINVAL;
	}

	if (stb & ~PCH_UART_LCR_STB) {
		dev_err(priv->port.dev, "Invalid STB(0x%x)\n", stb);
		return -EINVAL;
	}

	lcr = parity;
	lcr |= bits;
	lcr |= stb;

	dev_dbg(priv->port.dev, "%s:baud = %u, div = %04x, lcr = %02x (%lu)\n",
		 __func__, baud, div, lcr, jiffies);
	iowrite8(PCH_UART_LCR_DLAB, priv->membase + UART_LCR);
	iowrite8(dll, priv->membase + PCH_UART_DLL);
	iowrite8(dlm, priv->membase + PCH_UART_DLM);
	iowrite8(lcr, priv->membase + UART_LCR);

	return 0;
}

static int pch_uart_hal_fifo_reset(struct eg20t_port *priv,
				    unsigned int flag)
{
	if (flag & ~(PCH_UART_FCR_TFR | PCH_UART_FCR_RFR)) {
		dev_err(priv->port.dev, "%s:Invalid flag(0x%x)\n",
			__func__, flag);
		return -EINVAL;
	}

	iowrite8(PCH_UART_FCR_FIFOE | priv->fcr, priv->membase + UART_FCR);
	iowrite8(PCH_UART_FCR_FIFOE | priv->fcr | flag,
		 priv->membase + UART_FCR);
	iowrite8(priv->fcr, priv->membase + UART_FCR);

	return 0;
}

static int pch_uart_hal_set_fifo(struct eg20t_port *priv,
				 unsigned int dmamode,
				 unsigned int fifo_size, unsigned int trigger)
{
	u8 fcr;

	if (dmamode & ~PCH_UART_FCR_DMS) {
		dev_err(priv->port.dev, "%s:Invalid DMA Mode(0x%x)\n",
			__func__, dmamode);
		return -EINVAL;
	}

	if (fifo_size & ~(PCH_UART_FCR_FIFOE | PCH_UART_FCR_FIFO256)) {
		dev_err(priv->port.dev, "%s:Invalid FIFO SIZE(0x%x)\n",
			__func__, fifo_size);
		return -EINVAL;
	}

	if (trigger & ~PCH_UART_FCR_RFTL) {
		dev_err(priv->port.dev, "%s:Invalid TRIGGER(0x%x)\n",
			__func__, trigger);
		return -EINVAL;
	}

	switch (priv->fifo_size) {
	case 256:
		priv->trigger_level =
		    trigger_level_256[trigger >> PCH_UART_FCR_RFTL_SHIFT];
		break;
	case 64:
		priv->trigger_level =
		    trigger_level_64[trigger >> PCH_UART_FCR_RFTL_SHIFT];
		break;
	case 16:
		priv->trigger_level =
		    trigger_level_16[trigger >> PCH_UART_FCR_RFTL_SHIFT];
		break;
	default:
		priv->trigger_level =
		    trigger_level_1[trigger >> PCH_UART_FCR_RFTL_SHIFT];
		break;
	}
	fcr =
	    dmamode | fifo_size | trigger | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR;
	iowrite8(PCH_UART_FCR_FIFOE, priv->membase + UART_FCR);
	iowrite8(PCH_UART_FCR_FIFOE | PCH_UART_FCR_RFR | PCH_UART_FCR_TFR,
		 priv->membase + UART_FCR);
	iowrite8(fcr, priv->membase + UART_FCR);
	priv->fcr = fcr;

	return 0;
}

static u8 pch_uart_hal_get_modem(struct eg20t_port *priv)
{
	unsigned int msr = ioread8(priv->membase + UART_MSR);
	priv->dmsr = msr & PCH_UART_MSR_DELTA;
	return (u8)msr;
}

static void pch_uart_hal_write(struct eg20t_port *priv,
			      const unsigned char *buf, int tx_size)
{
	int i;
	unsigned int thr;

	for (i = 0; i < tx_size;) {
		thr = buf[i++];
		iowrite8(thr, priv->membase + PCH_UART_THR);
	}
}

static int pch_uart_hal_read(struct eg20t_port *priv, unsigned char *buf,
			     int rx_size)
{
	int i;
	u8 rbr, lsr;
	struct uart_port *port = &priv->port;

	lsr = ioread8(priv->membase + UART_LSR);
	for (i = 0, lsr = ioread8(priv->membase + UART_LSR);
	     i < rx_size && lsr & (UART_LSR_DR | UART_LSR_BI);
	     lsr = ioread8(priv->membase + UART_LSR)) {
		rbr = ioread8(priv->membase + PCH_UART_RBR);

		if (lsr & UART_LSR_BI) {
			port->icount.brk++;
			if (uart_handle_break(port))
				continue;
		}
#ifdef SUPPORT_SYSRQ
		if (port->sysrq) {
			if (uart_handle_sysrq_char(port, rbr))
				continue;
		}
#endif

		buf[i++] = rbr;
	}
	return i;
}

static unsigned char pch_uart_hal_get_iid(struct eg20t_port *priv)
{
	return ioread8(priv->membase + UART_IIR) &\
		      (PCH_UART_IIR_IID | PCH_UART_IIR_TOI | PCH_UART_IIR_IP);
}

static u8 pch_uart_hal_get_line_status(struct eg20t_port *priv)
{
	return ioread8(priv->membase + UART_LSR);
}

static void pch_uart_hal_set_break(struct eg20t_port *priv, int on)
{
	unsigned int lcr;

	lcr = ioread8(priv->membase + UART_LCR);
	if (on)
		lcr |= PCH_UART_LCR_SB;
	else
		lcr &= ~PCH_UART_LCR_SB;

	iowrite8(lcr, priv->membase + UART_LCR);
}

static int push_rx(struct eg20t_port *priv, const unsigned char *buf,
		   int size)
{
	struct uart_port *port = &priv->port;
	struct tty_port *tport = &port->state->port;

	tty_insert_flip_string(tport, buf, size);
	tty_flip_buffer_push(tport);

	return 0;
}

static int pop_tx_x(struct eg20t_port *priv, unsigned char *buf)
{
	int ret = 0;
	struct uart_port *port = &priv->port;

	if (port->x_char) {
		dev_dbg(priv->port.dev, "%s:X character send %02x (%lu)\n",
			__func__, port->x_char, jiffies);
		buf[0] = port->x_char;
		port->x_char = 0;
		ret = 1;
	}

	return ret;
}

static int dma_push_rx(struct eg20t_port *priv, int size)
{
	struct tty_struct *tty;
	int room;
	struct uart_port *port = &priv->port;
	struct tty_port *tport = &port->state->port;

	port = &priv->port;
	tty = tty_port_tty_get(tport);
	if (!tty) {
		dev_dbg(priv->port.dev, "%s:tty is busy now", __func__);
		return 0;
	}

	room = tty_buffer_request_room(tport, size);

	if (room < size)
		dev_warn(port->dev, "Rx overrun: dropping %u bytes\n",
			 size - room);
	if (!room)
		return room;

	tty_insert_flip_string(tport, sg_virt(&priv->sg_rx), size);

	port->icount.rx += room;
	tty_kref_put(tty);

	return room;
}

static void pch_free_dma(struct uart_port *port)
{
	struct eg20t_port *priv;
	priv = container_of(port, struct eg20t_port, port);

	if (priv->chan_tx) {
		dma_release_channel(priv->chan_tx);
		priv->chan_tx = NULL;
	}
	if (priv->chan_rx) {
		dma_release_channel(priv->chan_rx);
		priv->chan_rx = NULL;
	}

	if (priv->rx_buf_dma) {
		dma_free_coherent(port->dev, port->fifosize, priv->rx_buf_virt,
				  priv->rx_buf_dma);
		priv->rx_buf_virt = NULL;
		priv->rx_buf_dma = 0;
	}

	return;
}

static bool filter(struct dma_chan *chan, void *slave)
{
	struct pch_dma_slave *param = slave;

	if ((chan->chan_id == param->chan_id) && (param->dma_dev ==
						  chan->device->dev)) {
		chan->private = param;
		return true;
	} else {
		return false;
	}
}

static void pch_request_dma(struct uart_port *port)
{
	dma_cap_mask_t mask;
	struct dma_chan *chan;
	struct pci_dev *dma_dev;
	struct pch_dma_slave *param;
	struct eg20t_port *priv =
				container_of(port, struct eg20t_port, port);
	dma_cap_zero(mask);
	dma_cap_set(DMA_SLAVE, mask);

	dma_dev = pci_get_bus_and_slot(priv->pdev->bus->number,
				       PCI_DEVFN(0xa, 0)); /* Get DMA's dev
								information */
	/* Set Tx DMA */
	param = &priv->param_tx;
	param->dma_dev = &dma_dev->dev;
	param->chan_id = priv->port.line * 2; /* Tx = 0, 2, 4, ... */

	param->tx_reg = port->mapbase + UART_TX;
	chan = dma_request_channel(mask, filter, param);
	if (!chan) {
		dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Tx)\n",
			__func__);
		return;
	}
	priv->chan_tx = chan;

	/* Set Rx DMA */
	param = &priv->param_rx;
	param->dma_dev = &dma_dev->dev;
	param->chan_id = priv->port.line * 2 + 1; /* Rx = Tx + 1 */

	param->rx_reg = port->mapbase + UART_RX;
	chan = dma_request_channel(mask, filter, param);
	if (!chan) {
		dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Rx)\n",
			__func__);
		dma_release_channel(priv->chan_tx);
		priv->chan_tx = NULL;
		return;
	}

	/* Get Consistent memory for DMA */
	priv->rx_buf_virt = dma_alloc_coherent(port->dev, port->fifosize,
				    &priv->rx_buf_dma, GFP_KERNEL);
	priv->chan_rx = chan;
}

static void pch_dma_rx_complete(void *arg)
{
	struct eg20t_port *priv = arg;
	struct uart_port *port = &priv->port;
	int count;

	dma_sync_sg_for_cpu(port->dev, &priv->sg_rx, 1, DMA_FROM_DEVICE);
	count = dma_push_rx(priv, priv->trigger_level);
	if (count)
		tty_flip_buffer_push(&port->state->port);
	async_tx_ack(priv->desc_rx);
	pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT |
					    PCH_UART_HAL_RX_ERR_INT);
}

static void pch_dma_tx_complete(void *arg)
{
	struct eg20t_port *priv = arg;
	struct uart_port *port = &priv->port;
	struct circ_buf *xmit = &port->state->xmit;
	struct scatterlist *sg = priv->sg_tx_p;
	int i;

	for (i = 0; i < priv->nent; i++, sg++) {
		xmit->tail += sg_dma_len(sg);
		port->icount.tx += sg_dma_len(sg);
	}
	xmit->tail &= UART_XMIT_SIZE - 1;
	async_tx_ack(priv->desc_tx);
	dma_unmap_sg(port->dev, sg, priv->nent, DMA_TO_DEVICE);
	priv->tx_dma_use = 0;
	priv->nent = 0;
	kfree(priv->sg_tx_p);
	pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
}

static int pop_tx(struct eg20t_port *priv, int size)
{
	int count = 0;
	struct uart_port *port = &priv->port;
	struct circ_buf *xmit = &port->state->xmit;

	if (uart_tx_stopped(port) || uart_circ_empty(xmit) || count >= size)
		goto pop_tx_end;

	do {
		int cnt_to_end =
		    CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
		int sz = min(size - count, cnt_to_end);
		pch_uart_hal_write(priv, &xmit->buf[xmit->tail], sz);
		xmit->tail = (xmit->tail + sz) & (UART_XMIT_SIZE - 1);
		count += sz;
	} while (!uart_circ_empty(xmit) && count < size);

pop_tx_end:
	dev_dbg(priv->port.dev, "%d characters. Remained %d characters.(%lu)\n",
		 count, size - count, jiffies);

	return count;
}

static int handle_rx_to(struct eg20t_port *priv)
{
	struct pch_uart_buffer *buf;
	int rx_size;
	int ret;
	if (!priv->start_rx) {
		pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT |
						     PCH_UART_HAL_RX_ERR_INT);
		return 0;
	}
	buf = &priv->rxbuf;
	do {
		rx_size = pch_uart_hal_read(priv, buf->buf, buf->size);
		ret = push_rx(priv, buf->buf, rx_size);
		if (ret)
			return 0;
	} while (rx_size == buf->size);

	return PCH_UART_HANDLED_RX_INT;
}

static int handle_rx(struct eg20t_port *priv)
{
	return handle_rx_to(priv);
}

static int dma_handle_rx(struct eg20t_port *priv)
{
	struct uart_port *port = &priv->port;
	struct dma_async_tx_descriptor *desc;
	struct scatterlist *sg;

	priv = container_of(port, struct eg20t_port, port);
	sg = &priv->sg_rx;

	sg_init_table(&priv->sg_rx, 1); /* Initialize SG table */

	sg_dma_len(sg) = priv->trigger_level;

	sg_set_page(&priv->sg_rx, virt_to_page(priv->rx_buf_virt),
		     sg_dma_len(sg), (unsigned long)priv->rx_buf_virt &
		     ~PAGE_MASK);

	sg_dma_address(sg) = priv->rx_buf_dma;

	desc = dmaengine_prep_slave_sg(priv->chan_rx,
			sg, 1, DMA_DEV_TO_MEM,
			DMA_PREP_INTERRUPT | DMA_CTRL_ACK);

	if (!desc)
		return 0;

	priv->desc_rx = desc;
	desc->callback = pch_dma_rx_complete;
	desc->callback_param = priv;
	desc->tx_submit(desc);
	dma_async_issue_pending(priv->chan_rx);

	return PCH_UART_HANDLED_RX_INT;
}

static unsigned int handle_tx(struct eg20t_port *priv)
{
	struct uart_port *port = &priv->port;
	struct circ_buf *xmit = &port->state->xmit;
	int fifo_size;
	int tx_size;
	int size;
	int tx_empty;

	if (!priv->start_tx) {
		dev_info(priv->port.dev, "%s:Tx isn't started. (%lu)\n",
			__func__, jiffies);
		pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
		priv->tx_empty = 1;
		return 0;
	}

	fifo_size = max(priv->fifo_size, 1);
	tx_empty = 1;
	if (pop_tx_x(priv, xmit->buf)) {
		pch_uart_hal_write(priv, xmit->buf, 1);
		port->icount.tx++;
		tx_empty = 0;
		fifo_size--;
	}
	size = min(xmit->head - xmit->tail, fifo_size);
	if (size < 0)
		size = fifo_size;

	tx_size = pop_tx(priv, size);
	if (tx_size > 0) {
		port->icount.tx += tx_size;
		tx_empty = 0;
	}

	priv->tx_empty = tx_empty;

	if (tx_empty) {
		pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
		uart_write_wakeup(port);
	}

	return PCH_UART_HANDLED_TX_INT;
}

static unsigned int dma_handle_tx(struct eg20t_port *priv)
{
	struct uart_port *port = &priv->port;
	struct circ_buf *xmit = &port->state->xmit;
	struct scatterlist *sg;
	int nent;
	int fifo_size;
	int tx_empty;
	struct dma_async_tx_descriptor *desc;
	int num;
	int i;
	int bytes;
	int size;
	int rem;

	if (!priv->start_tx) {
		dev_info(priv->port.dev, "%s:Tx isn't started. (%lu)\n",
			__func__, jiffies);
		pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
		priv->tx_empty = 1;
		return 0;
	}

	if (priv->tx_dma_use) {
		dev_dbg(priv->port.dev, "%s:Tx is not completed. (%lu)\n",
			__func__, jiffies);
		pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
		priv->tx_empty = 1;
		return 0;
	}

	fifo_size = max(priv->fifo_size, 1);
	tx_empty = 1;
	if (pop_tx_x(priv, xmit->buf)) {
		pch_uart_hal_write(priv, xmit->buf, 1);
		port->icount.tx++;
		tx_empty = 0;
		fifo_size--;
	}

	bytes = min((int)CIRC_CNT(xmit->head, xmit->tail,
			     UART_XMIT_SIZE), CIRC_CNT_TO_END(xmit->head,
			     xmit->tail, UART_XMIT_SIZE));
	if (!bytes) {
		dev_dbg(priv->port.dev, "%s 0 bytes return\n", __func__);
		pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_TX_INT);
		uart_write_wakeup(port);
		return 0;
	}

	if (bytes > fifo_size) {
		num = bytes / fifo_size + 1;
		size = fifo_size;
		rem = bytes % fifo_size;
	} else {
		num = 1;
		size = bytes;
		rem = bytes;
	}

	dev_dbg(priv->port.dev, "%s num=%d size=%d rem=%d\n",
		__func__, num, size, rem);

	priv->tx_dma_use = 1;

	priv->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC);
	if (!priv->sg_tx_p) {
		dev_err(priv->port.dev, "%s:kzalloc Failed\n", __func__);
		return 0;
	}

	sg_init_table(priv->sg_tx_p, num); /* Initialize SG table */
	sg = priv->sg_tx_p;

	for (i = 0; i < num; i++, sg++) {
		if (i == (num - 1))
			sg_set_page(sg, virt_to_page(xmit->buf),
				    rem, fifo_size * i);
		else
			sg_set_page(sg, virt_to_page(xmit->buf),
				    size, fifo_size * i);
	}

	sg = priv->sg_tx_p;
	nent = dma_map_sg(port->dev, sg, num, DMA_TO_DEVICE);
	if (!nent) {
		dev_err(priv->port.dev, "%s:dma_map_sg Failed\n", __func__);
		return 0;
	}
	priv->nent = nent;

	for (i = 0; i < nent; i++, sg++) {
		sg->offset = (xmit->tail & (UART_XMIT_SIZE - 1)) +
			      fifo_size * i;
		sg_dma_address(sg) = (sg_dma_address(sg) &
				    ~(UART_XMIT_SIZE - 1)) + sg->offset;
		if (i == (nent - 1))
			sg_dma_len(sg) = rem;
		else
			sg_dma_len(sg) = size;
	}

	desc = dmaengine_prep_slave_sg(priv->chan_tx,
					priv->sg_tx_p, nent, DMA_MEM_TO_DEV,
					DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
	if (!desc) {
		dev_err(priv->port.dev, "%s:device_prep_slave_sg Failed\n",
			__func__);
		return 0;
	}
	dma_sync_sg_for_device(port->dev, priv->sg_tx_p, nent, DMA_TO_DEVICE);
	priv->desc_tx = desc;
	desc->callback = pch_dma_tx_complete;
	desc->callback_param = priv;

	desc->tx_submit(desc);

	dma_async_issue_pending(priv->chan_tx);

	return PCH_UART_HANDLED_TX_INT;
}

static void pch_uart_err_ir(struct eg20t_port *priv, unsigned int lsr)
{
	struct uart_port *port = &priv->port;
	struct tty_struct *tty = tty_port_tty_get(&port->state->port);
	char   *error_msg[5] = {};
	int    i = 0;

	if (lsr & PCH_UART_LSR_ERR)
		error_msg[i++] = "Error data in FIFO\n";

	if (lsr & UART_LSR_FE) {
		port->icount.frame++;
		error_msg[i++] = "  Framing Error\n";
	}

	if (lsr & UART_LSR_PE) {
		port->icount.parity++;
		error_msg[i++] = "  Parity Error\n";
	}

	if (lsr & UART_LSR_OE) {
		port->icount.overrun++;
		error_msg[i++] = "  Overrun Error\n";
	}

	if (tty == NULL) {
		for (i = 0; error_msg[i] != NULL; i++)
			dev_err(&priv->pdev->dev, error_msg[i]);
	}
}

static irqreturn_t pch_uart_interrupt(int irq, void *dev_id)
{
	struct eg20t_port *priv = dev_id;
	unsigned int handled;
	u8 lsr;
	int ret = 0;
	unsigned char iid;
	unsigned long flags;
	int next = 1;
	u8 msr;

	spin_lock_irqsave(&priv->lock, flags);
	handled = 0;
	while (next) {
		iid = pch_uart_hal_get_iid(priv);
		if (iid & PCH_UART_IIR_IP) /* No Interrupt */
			break;
		switch (iid) {
		case PCH_UART_IID_RLS:	/* Receiver Line Status */
			lsr = pch_uart_hal_get_line_status(priv);
			if (lsr & (PCH_UART_LSR_ERR | UART_LSR_FE |
						UART_LSR_PE | UART_LSR_OE)) {
				pch_uart_err_ir(priv, lsr);
				ret = PCH_UART_HANDLED_RX_ERR_INT;
			} else {
				ret = PCH_UART_HANDLED_LS_INT;
			}
			break;
		case PCH_UART_IID_RDR:	/* Received Data Ready */
			if (priv->use_dma) {
				pch_uart_hal_disable_interrupt(priv,
						PCH_UART_HAL_RX_INT |
						PCH_UART_HAL_RX_ERR_INT);
				ret = dma_handle_rx(priv);
				if (!ret)
					pch_uart_hal_enable_interrupt(priv,
						PCH_UART_HAL_RX_INT |
						PCH_UART_HAL_RX_ERR_INT);
			} else {
				ret = handle_rx(priv);
			}
			break;
		case PCH_UART_IID_RDR_TO:	/* Received Data Ready
						   (FIFO Timeout) */
			ret = handle_rx_to(priv);
			break;
		case PCH_UART_IID_THRE:	/* Transmitter Holding Register
						   Empty */
			if (priv->use_dma)
				ret = dma_handle_tx(priv);
			else
				ret = handle_tx(priv);
			break;
		case PCH_UART_IID_MS:	/* Modem Status */
			msr = pch_uart_hal_get_modem(priv);
			next = 0; /* MS ir prioirty is the lowest. So, MS ir
				     means final interrupt */
			if ((msr & UART_MSR_ANY_DELTA) == 0)
				break;
			ret |= PCH_UART_HANDLED_MS_INT;
			break;
		default:	/* Never junp to this label */
			dev_err(priv->port.dev, "%s:iid=%02x (%lu)\n", __func__,
				iid, jiffies);
			ret = -1;
			next = 0;
			break;
		}
		handled |= (unsigned int)ret;
	}

	spin_unlock_irqrestore(&priv->lock, flags);
	return IRQ_RETVAL(handled);
}

/* This function tests whether the transmitter fifo and shifter for the port
						described by 'port' is empty. */
static unsigned int pch_uart_tx_empty(struct uart_port *port)
{
	struct eg20t_port *priv;

	priv = container_of(port, struct eg20t_port, port);
	if (priv->tx_empty)
		return TIOCSER_TEMT;
	else
		return 0;
}

/* Returns the current state of modem control inputs. */
static unsigned int pch_uart_get_mctrl(struct uart_port *port)
{
	struct eg20t_port *priv;
	u8 modem;
	unsigned int ret = 0;

	priv = container_of(port, struct eg20t_port, port);
	modem = pch_uart_hal_get_modem(priv);

	if (modem & UART_MSR_DCD)
		ret |= TIOCM_CAR;

	if (modem & UART_MSR_RI)
		ret |= TIOCM_RNG;

	if (modem & UART_MSR_DSR)
		ret |= TIOCM_DSR;

	if (modem & UART_MSR_CTS)
		ret |= TIOCM_CTS;

	return ret;
}

static void pch_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
	u32 mcr = 0;
	struct eg20t_port *priv = container_of(port, struct eg20t_port, port);

	if (mctrl & TIOCM_DTR)
		mcr |= UART_MCR_DTR;
	if (mctrl & TIOCM_RTS)
		mcr |= UART_MCR_RTS;
	if (mctrl & TIOCM_LOOP)
		mcr |= UART_MCR_LOOP;

	if (priv->mcr & UART_MCR_AFE)
		mcr |= UART_MCR_AFE;

	if (mctrl)
		iowrite8(mcr, priv->membase + UART_MCR);
}

static void pch_uart_stop_tx(struct uart_port *port)
{
	struct eg20t_port *priv;
	priv = container_of(port, struct eg20t_port, port);
	priv->start_tx = 0;
	priv->tx_dma_use = 0;
}

static void pch_uart_start_tx(struct uart_port *port)
{
	struct eg20t_port *priv;

	priv = container_of(port, struct eg20t_port, port);

	if (priv->use_dma) {
		if (priv->tx_dma_use) {
			dev_dbg(priv->port.dev, "%s : Tx DMA is NOT empty.\n",
				__func__);
			return;
		}
	}

	priv->start_tx = 1;
	pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
}

static void pch_uart_stop_rx(struct uart_port *port)
{
	struct eg20t_port *priv;
	priv = container_of(port, struct eg20t_port, port);
	priv->start_rx = 0;
	pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_RX_INT |
					     PCH_UART_HAL_RX_ERR_INT);
}

/* Enable the modem status interrupts. */
static void pch_uart_enable_ms(struct uart_port *port)
{
	struct eg20t_port *priv;
	priv = container_of(port, struct eg20t_port, port);
	pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_MS_INT);
}

/* Control the transmission of a break signal. */
static void pch_uart_break_ctl(struct uart_port *port, int ctl)
{
	struct eg20t_port *priv;
	unsigned long flags;

	priv = container_of(port, struct eg20t_port, port);
	spin_lock_irqsave(&priv->lock, flags);
	pch_uart_hal_set_break(priv, ctl);
	spin_unlock_irqrestore(&priv->lock, flags);
}

/* Grab any interrupt resources and initialise any low level driver state. */
static int pch_uart_startup(struct uart_port *port)
{
	struct eg20t_port *priv;
	int ret;
	int fifo_size;
	int trigger_level;

	priv = container_of(port, struct eg20t_port, port);
	priv->tx_empty = 1;

	if (port->uartclk)
		priv->uartclk = port->uartclk;
	else
		port->uartclk = priv->uartclk;

	pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
	ret = pch_uart_hal_set_line(priv, default_baud,
			      PCH_UART_HAL_PARITY_NONE, PCH_UART_HAL_8BIT,
			      PCH_UART_HAL_STB1);
	if (ret)
		return ret;

	switch (priv->fifo_size) {
	case 256:
		fifo_size = PCH_UART_HAL_FIFO256;
		break;
	case 64:
		fifo_size = PCH_UART_HAL_FIFO64;
		break;
	case 16:
		fifo_size = PCH_UART_HAL_FIFO16;
		break;
	case 1:
	default:
		fifo_size = PCH_UART_HAL_FIFO_DIS;
		break;
	}

	switch (priv->trigger) {
	case PCH_UART_HAL_TRIGGER1:
		trigger_level = 1;
		break;
	case PCH_UART_HAL_TRIGGER_L:
		trigger_level = priv->fifo_size / 4;
		break;
	case PCH_UART_HAL_TRIGGER_M:
		trigger_level = priv->fifo_size / 2;
		break;
	case PCH_UART_HAL_TRIGGER_H:
	default:
		trigger_level = priv->fifo_size - (priv->fifo_size / 8);
		break;
	}

	priv->trigger_level = trigger_level;
	ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
				    fifo_size, priv->trigger);
	if (ret < 0)
		return ret;

	ret = request_irq(priv->port.irq, pch_uart_interrupt, IRQF_SHARED,
			KBUILD_MODNAME, priv);
	if (ret < 0)
		return ret;

	if (priv->use_dma)
		pch_request_dma(port);

	priv->start_rx = 1;
	pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_RX_INT |
					    PCH_UART_HAL_RX_ERR_INT);
	uart_update_timeout(port, CS8, default_baud);

	return 0;
}

static void pch_uart_shutdown(struct uart_port *port)
{
	struct eg20t_port *priv;
	int ret;

	priv = container_of(port, struct eg20t_port, port);
	pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
	pch_uart_hal_fifo_reset(priv, PCH_UART_HAL_CLR_ALL_FIFO);
	ret = pch_uart_hal_set_fifo(priv, PCH_UART_HAL_DMA_MODE0,
			      PCH_UART_HAL_FIFO_DIS, PCH_UART_HAL_TRIGGER1);
	if (ret)
		dev_err(priv->port.dev,
			"pch_uart_hal_set_fifo Failed(ret=%d)\n", ret);

	pch_free_dma(port);

	free_irq(priv->port.irq, priv);
}

/* Change the port parameters, including word length, parity, stop
 *bits.  Update read_status_mask and ignore_status_mask to indicate
 *the types of events we are interested in receiving.  */
static void pch_uart_set_termios(struct uart_port *port,
				 struct ktermios *termios, struct ktermios *old)
{
	int rtn;
	unsigned int baud, parity, bits, stb;
	struct eg20t_port *priv;
	unsigned long flags;

	priv = container_of(port, struct eg20t_port, port);
	switch (termios->c_cflag & CSIZE) {
	case CS5:
		bits = PCH_UART_HAL_5BIT;
		break;
	case CS6:
		bits = PCH_UART_HAL_6BIT;
		break;
	case CS7:
		bits = PCH_UART_HAL_7BIT;
		break;
	default:		/* CS8 */
		bits = PCH_UART_HAL_8BIT;
		break;
	}
	if (termios->c_cflag & CSTOPB)
		stb = PCH_UART_HAL_STB2;
	else
		stb = PCH_UART_HAL_STB1;

	if (termios->c_cflag & PARENB) {
		if (termios->c_cflag & PARODD)
			parity = PCH_UART_HAL_PARITY_ODD;
		else
			parity = PCH_UART_HAL_PARITY_EVEN;

	} else
		parity = PCH_UART_HAL_PARITY_NONE;

	/* Only UART0 has auto hardware flow function */
	if ((termios->c_cflag & CRTSCTS) && (priv->fifo_size == 256))
		priv->mcr |= UART_MCR_AFE;
	else
		priv->mcr &= ~UART_MCR_AFE;

	termios->c_cflag &= ~CMSPAR; /* Mark/Space parity is not supported */

	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);

	spin_lock_irqsave(&priv->lock, flags);
	spin_lock(&port->lock);

	uart_update_timeout(port, termios->c_cflag, baud);
	rtn = pch_uart_hal_set_line(priv, baud, parity, bits, stb);
	if (rtn)
		goto out;

	pch_uart_set_mctrl(&priv->port, priv->port.mctrl);
	/* Don't rewrite B0 */
	if (tty_termios_baud_rate(termios))
		tty_termios_encode_baud_rate(termios, baud, baud);

out:
	spin_unlock(&port->lock);
	spin_unlock_irqrestore(&priv->lock, flags);
}

static const char *pch_uart_type(struct uart_port *port)
{
	return KBUILD_MODNAME;
}

static void pch_uart_release_port(struct uart_port *port)
{
	struct eg20t_port *priv;

	priv = container_of(port, struct eg20t_port, port);
	pci_iounmap(priv->pdev, priv->membase);
	pci_release_regions(priv->pdev);
}

static int pch_uart_request_port(struct uart_port *port)
{
	struct eg20t_port *priv;
	int ret;
	void __iomem *membase;

	priv = container_of(port, struct eg20t_port, port);
	ret = pci_request_regions(priv->pdev, KBUILD_MODNAME);
	if (ret < 0)
		return -EBUSY;

	membase = pci_iomap(priv->pdev, 1, 0);
	if (!membase) {
		pci_release_regions(priv->pdev);
		return -EBUSY;
	}
	priv->membase = port->membase = membase;

	return 0;
}

static void pch_uart_config_port(struct uart_port *port, int type)
{
	struct eg20t_port *priv;

	priv = container_of(port, struct eg20t_port, port);
	if (type & UART_CONFIG_TYPE) {
		port->type = priv->port_type;
		pch_uart_request_port(port);
	}
}

static int pch_uart_verify_port(struct uart_port *port,
				struct serial_struct *serinfo)
{
	struct eg20t_port *priv;

	priv = container_of(port, struct eg20t_port, port);
	if (serinfo->flags & UPF_LOW_LATENCY) {
		dev_info(priv->port.dev,
			"PCH UART : Use PIO Mode (without DMA)\n");
		priv->use_dma = 0;
		serinfo->flags &= ~UPF_LOW_LATENCY;
	} else {
#ifndef CONFIG_PCH_DMA
		dev_err(priv->port.dev, "%s : PCH DMA is not Loaded.\n",
			__func__);
		return -EOPNOTSUPP;
#endif
		dev_info(priv->port.dev, "PCH UART : Use DMA Mode\n");
		if (!priv->use_dma)
			pch_request_dma(port);
		priv->use_dma = 1;
	}

	return 0;
}

#if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_PCH_UART_CONSOLE)
/*
 *	Wait for transmitter & holding register to empty
 */
static void wait_for_xmitr(struct eg20t_port *up, int bits)
{
	unsigned int status, tmout = 10000;

	/* Wait up to 10ms for the character(s) to be sent. */
	for (;;) {
		status = ioread8(up->membase + UART_LSR);

		if ((status & bits) == bits)
			break;
		if (--tmout == 0)
			break;
		udelay(1);
	}

	/* Wait up to 1s for flow control if necessary */
	if (up->port.flags & UPF_CONS_FLOW) {
		unsigned int tmout;
		for (tmout = 1000000; tmout; tmout--) {
			unsigned int msr = ioread8(up->membase + UART_MSR);
			if (msr & UART_MSR_CTS)
				break;
			udelay(1);
			touch_nmi_watchdog();
		}
	}
}
#endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_PCH_UART_CONSOLE */

#ifdef CONFIG_CONSOLE_POLL
/*
 * Console polling routines for communicate via uart while
 * in an interrupt or debug context.
 */
static int pch_uart_get_poll_char(struct uart_port *port)
{
	struct eg20t_port *priv =
		container_of(port, struct eg20t_port, port);
	u8 lsr = ioread8(priv->membase + UART_LSR);

	if (!(lsr & UART_LSR_DR))
		return NO_POLL_CHAR;

	return ioread8(priv->membase + PCH_UART_RBR);
}


static void pch_uart_put_poll_char(struct uart_port *port,
			 unsigned char c)
{
	unsigned int ier;
	struct eg20t_port *priv =
		container_of(port, struct eg20t_port, port);

	/*
	 * First save the IER then disable the interrupts
	 */
	ier = ioread8(priv->membase + UART_IER);
	pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);

	wait_for_xmitr(priv, UART_LSR_THRE);
	/*
	 * Send the character out.
	 * If a LF, also do CR...
	 */
	iowrite8(c, priv->membase + PCH_UART_THR);
	if (c == 10) {
		wait_for_xmitr(priv, UART_LSR_THRE);
		iowrite8(13, priv->membase + PCH_UART_THR);
	}

	/*
	 * Finally, wait for transmitter to become empty
	 * and restore the IER
	 */
	wait_for_xmitr(priv, BOTH_EMPTY);
	iowrite8(ier, priv->membase + UART_IER);
}
#endif /* CONFIG_CONSOLE_POLL */

static struct uart_ops pch_uart_ops = {
	.tx_empty = pch_uart_tx_empty,
	.set_mctrl = pch_uart_set_mctrl,
	.get_mctrl = pch_uart_get_mctrl,
	.stop_tx = pch_uart_stop_tx,
	.start_tx = pch_uart_start_tx,
	.stop_rx = pch_uart_stop_rx,
	.enable_ms = pch_uart_enable_ms,
	.break_ctl = pch_uart_break_ctl,
	.startup = pch_uart_startup,
	.shutdown = pch_uart_shutdown,
	.set_termios = pch_uart_set_termios,
/*	.pm		= pch_uart_pm,		Not supported yet */
/*	.set_wake	= pch_uart_set_wake,	Not supported yet */
	.type = pch_uart_type,
	.release_port = pch_uart_release_port,
	.request_port = pch_uart_request_port,
	.config_port = pch_uart_config_port,
	.verify_port = pch_uart_verify_port,
#ifdef CONFIG_CONSOLE_POLL
	.poll_get_char = pch_uart_get_poll_char,
	.poll_put_char = pch_uart_put_poll_char,
#endif
};

#ifdef CONFIG_SERIAL_PCH_UART_CONSOLE

static void pch_console_putchar(struct uart_port *port, int ch)
{
	struct eg20t_port *priv =
		container_of(port, struct eg20t_port, port);

	wait_for_xmitr(priv, UART_LSR_THRE);
	iowrite8(ch, priv->membase + PCH_UART_THR);
}

/*
 *	Print a string to the serial port trying not to disturb
 *	any possible real use of the port...
 *
 *	The console_lock must be held when we get here.
 */
static void
pch_console_write(struct console *co, const char *s, unsigned int count)
{
	struct eg20t_port *priv;
	unsigned long flags;
	int priv_locked = 1;
	int port_locked = 1;
	u8 ier;

	priv = pch_uart_ports[co->index];

	touch_nmi_watchdog();

	local_irq_save(flags);
	if (priv->port.sysrq) {
		/* call to uart_handle_sysrq_char already took the priv lock */
		priv_locked = 0;
		/* serial8250_handle_port() already took the port lock */
		port_locked = 0;
	} else if (oops_in_progress) {
		priv_locked = spin_trylock(&priv->lock);
		port_locked = spin_trylock(&priv->port.lock);
	} else {
		spin_lock(&priv->lock);
		spin_lock(&priv->port.lock);
	}

	/*
	 *	First save the IER then disable the interrupts
	 */
	ier = ioread8(priv->membase + UART_IER);

	pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);

	uart_console_write(&priv->port, s, count, pch_console_putchar);

	/*
	 *	Finally, wait for transmitter to become empty
	 *	and restore the IER
	 */
	wait_for_xmitr(priv, BOTH_EMPTY);
	iowrite8(ier, priv->membase + UART_IER);

	if (port_locked)
		spin_unlock(&priv->port.lock);
	if (priv_locked)
		spin_unlock(&priv->lock);
	local_irq_restore(flags);
}

static int __init pch_console_setup(struct console *co, char *options)
{
	struct uart_port *port;
	int baud = default_baud;
	int bits = 8;
	int parity = 'n';
	int flow = 'n';

	/*
	 * Check whether an invalid uart number has been specified, and
	 * if so, search for the first available port that does have
	 * console support.
	 */
	if (co->index >= PCH_UART_NR)
		co->index = 0;
	port = &pch_uart_ports[co->index]->port;

	if (!port || (!port->iobase && !port->membase))
		return -ENODEV;

	port->uartclk = pch_uart_get_uartclk();

	if (options)
		uart_parse_options(options, &baud, &parity, &bits, &flow);

	return uart_set_options(port, co, baud, parity, bits, flow);
}

static struct uart_driver pch_uart_driver;

static struct console pch_console = {
	.name		= PCH_UART_DRIVER_DEVICE,
	.write		= pch_console_write,
	.device		= uart_console_device,
	.setup		= pch_console_setup,
	.flags		= CON_PRINTBUFFER | CON_ANYTIME,
	.index		= -1,
	.data		= &pch_uart_driver,
};

#define PCH_CONSOLE	(&pch_console)
#else
#define PCH_CONSOLE	NULL
#endif	/* CONFIG_SERIAL_PCH_UART_CONSOLE */

static struct uart_driver pch_uart_driver = {
	.owner = THIS_MODULE,
	.driver_name = KBUILD_MODNAME,
	.dev_name = PCH_UART_DRIVER_DEVICE,
	.major = 0,
	.minor = 0,
	.nr = PCH_UART_NR,
	.cons = PCH_CONSOLE,
};

static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev,
					     const struct pci_device_id *id)
{
	struct eg20t_port *priv;
	int ret;
	unsigned int iobase;
	unsigned int mapbase;
	unsigned char *rxbuf;
	int fifosize;
	int port_type;
	struct pch_uart_driver_data *board;
	char name[32];	/* for debugfs file name */

	board = &drv_dat[id->driver_data];
	port_type = board->port_type;

	priv = kzalloc(sizeof(struct eg20t_port), GFP_KERNEL);
	if (priv == NULL)
		goto init_port_alloc_err;

	rxbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
	if (!rxbuf)
		goto init_port_free_txbuf;

	switch (port_type) {
	case PORT_UNKNOWN:
		fifosize = 256; /* EG20T/ML7213: UART0 */
		break;
	case PORT_8250:
		fifosize = 64; /* EG20T:UART1~3  ML7213: UART1~2*/
		break;
	default:
		dev_err(&pdev->dev, "Invalid Port Type(=%d)\n", port_type);
		goto init_port_hal_free;
	}

	pci_enable_msi(pdev);
	pci_set_master(pdev);

	spin_lock_init(&priv->lock);

	iobase = pci_resource_start(pdev, 0);
	mapbase = pci_resource_start(pdev, 1);
	priv->mapbase = mapbase;
	priv->iobase = iobase;
	priv->pdev = pdev;
	priv->tx_empty = 1;
	priv->rxbuf.buf = rxbuf;
	priv->rxbuf.size = PAGE_SIZE;

	priv->fifo_size = fifosize;
	priv->uartclk = pch_uart_get_uartclk();
	priv->port_type = PORT_MAX_8250 + port_type + 1;
	priv->port.dev = &pdev->dev;
	priv->port.iobase = iobase;
	priv->port.membase = NULL;
	priv->port.mapbase = mapbase;
	priv->port.irq = pdev->irq;
	priv->port.iotype = UPIO_PORT;
	priv->port.ops = &pch_uart_ops;
	priv->port.flags = UPF_BOOT_AUTOCONF;
	priv->port.fifosize = fifosize;
	priv->port.line = board->line_no;
	priv->trigger = PCH_UART_HAL_TRIGGER_M;

	spin_lock_init(&priv->port.lock);

	pci_set_drvdata(pdev, priv);
	priv->trigger_level = 1;
	priv->fcr = 0;

#ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
	pch_uart_ports[board->line_no] = priv;
#endif
	ret = uart_add_one_port(&pch_uart_driver, &priv->port);
	if (ret < 0)
		goto init_port_hal_free;

#ifdef CONFIG_DEBUG_FS
	snprintf(name, sizeof(name), "uart%d_regs", board->line_no);
	priv->debugfs = debugfs_create_file(name, S_IFREG | S_IRUGO,
				NULL, priv, &port_regs_ops);
#endif

	return priv;

init_port_hal_free:
#ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
	pch_uart_ports[board->line_no] = NULL;
#endif
	free_page((unsigned long)rxbuf);
init_port_free_txbuf:
	kfree(priv);
init_port_alloc_err:

	return NULL;
}

static void pch_uart_exit_port(struct eg20t_port *priv)
{

#ifdef CONFIG_DEBUG_FS
	if (priv->debugfs)
		debugfs_remove(priv->debugfs);
#endif
	uart_remove_one_port(&pch_uart_driver, &priv->port);
	pci_set_drvdata(priv->pdev, NULL);
	free_page((unsigned long)priv->rxbuf.buf);
}

static void pch_uart_pci_remove(struct pci_dev *pdev)
{
	struct eg20t_port *priv = pci_get_drvdata(pdev);

	pci_disable_msi(pdev);

#ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
	pch_uart_ports[priv->port.line] = NULL;
#endif
	pch_uart_exit_port(priv);
	pci_disable_device(pdev);
	kfree(priv);
	return;
}
#ifdef CONFIG_PM
static int pch_uart_pci_suspend(struct pci_dev *pdev, pm_message_t state)
{
	struct eg20t_port *priv = pci_get_drvdata(pdev);

	uart_suspend_port(&pch_uart_driver, &priv->port);

	pci_save_state(pdev);
	pci_set_power_state(pdev, pci_choose_state(pdev, state));
	return 0;
}

static int pch_uart_pci_resume(struct pci_dev *pdev)
{
	struct eg20t_port *priv = pci_get_drvdata(pdev);
	int ret;

	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);

	ret = pci_enable_device(pdev);
	if (ret) {
		dev_err(&pdev->dev,
		"%s-pci_enable_device failed(ret=%d) ", __func__, ret);
		return ret;
	}

	uart_resume_port(&pch_uart_driver, &priv->port);

	return 0;
}
#else
#define pch_uart_pci_suspend NULL
#define pch_uart_pci_resume NULL
#endif

static DEFINE_PCI_DEVICE_TABLE(pch_uart_pci_id) = {
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8811),
	 .driver_data = pch_et20t_uart0},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8812),
	 .driver_data = pch_et20t_uart1},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8813),
	 .driver_data = pch_et20t_uart2},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x8814),
	 .driver_data = pch_et20t_uart3},
	{PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8027),
	 .driver_data = pch_ml7213_uart0},
	{PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8028),
	 .driver_data = pch_ml7213_uart1},
	{PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8029),
	 .driver_data = pch_ml7213_uart2},
	{PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800C),
	 .driver_data = pch_ml7223_uart0},
	{PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x800D),
	 .driver_data = pch_ml7223_uart1},
	{PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8811),
	 .driver_data = pch_ml7831_uart0},
	{PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x8812),
	 .driver_data = pch_ml7831_uart1},
	{0,},
};

static int pch_uart_pci_probe(struct pci_dev *pdev,
					const struct pci_device_id *id)
{
	int ret;
	struct eg20t_port *priv;

	ret = pci_enable_device(pdev);
	if (ret < 0)
		goto probe_error;

	priv = pch_uart_init_port(pdev, id);
	if (!priv) {
		ret = -EBUSY;
		goto probe_disable_device;
	}
	pci_set_drvdata(pdev, priv);

	return ret;

probe_disable_device:
	pci_disable_msi(pdev);
	pci_disable_device(pdev);
probe_error:
	return ret;
}

static struct pci_driver pch_uart_pci_driver = {
	.name = "pch_uart",
	.id_table = pch_uart_pci_id,
	.probe = pch_uart_pci_probe,
	.remove = pch_uart_pci_remove,
	.suspend = pch_uart_pci_suspend,
	.resume = pch_uart_pci_resume,
};

static int __init pch_uart_module_init(void)
{
	int ret;

	/* register as UART driver */
	ret = uart_register_driver(&pch_uart_driver);
	if (ret < 0)
		return ret;

	/* register as PCI driver */
	ret = pci_register_driver(&pch_uart_pci_driver);
	if (ret < 0)
		uart_unregister_driver(&pch_uart_driver);

	return ret;
}
module_init(pch_uart_module_init);

static void __exit pch_uart_module_exit(void)
{
	pci_unregister_driver(&pch_uart_pci_driver);
	uart_unregister_driver(&pch_uart_driver);
}
module_exit(pch_uart_module_exit);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Intel EG20T PCH UART PCI Driver");
module_param(default_baud, uint, S_IRUGO);
MODULE_PARM_DESC(default_baud,
                 "Default BAUD for initial driver state and console (default 9600)");
module_param(user_uartclk, uint, S_IRUGO);
MODULE_PARM_DESC(user_uartclk,
                 "Override UART default or board specific UART clock");