aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/serial/mcfserial.c
blob: 3db206d29b338b36df60bd6920872fcdb6d4702b (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
/*
 * mcfserial.c -- serial driver for ColdFire internal UARTS.
 *
 * Copyright (C) 1999-2003 Greg Ungerer <gerg@snapgear.com>
 * Copyright (c) 2000-2001 Lineo, Inc. <www.lineo.com> 
 * Copyright (C) 2001-2002 SnapGear Inc. <www.snapgear.com> 
 *
 * Based on code from 68332serial.c which was:
 *
 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 1998 TSHG
 * Copyright (c) 1999 Rt-Control Inc. <jeff@uclinux.org>
 *
 * Changes:
 * 08/07/2003    Daniele Bellucci <bellucda@tiscali.it>
 *               some cleanups in mcfrs_write.
 *
 */
 
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/wait.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/kernel.h>
#include <linux/serial.h>
#include <linux/serialP.h>
#include <linux/console.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/delay.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/semaphore.h>
#include <asm/delay.h>
#include <asm/coldfire.h>
#include <asm/mcfsim.h>
#include <asm/mcfuart.h>
#include <asm/nettel.h>
#include <asm/uaccess.h>
#include "mcfserial.h"

struct timer_list mcfrs_timer_struct;

/*
 *	Default console baud rate,  we use this as the default
 *	for all ports so init can just open /dev/console and
 *	keep going.  Perhaps one day the cflag settings for the
 *	console can be used instead.
 */
#if defined(CONFIG_HW_FEITH)
#define	CONSOLE_BAUD_RATE	38400
#define	DEFAULT_CBAUD		B38400
#elif defined(CONFIG_MOD5272) || defined(CONFIG_M5208EVB) || \
      defined(CONFIG_M5329EVB) || defined(CONFIG_GILBARCO)
#define CONSOLE_BAUD_RATE 	115200
#define DEFAULT_CBAUD		B115200
#elif defined(CONFIG_ARNEWSH) || defined(CONFIG_FREESCALE) || \
      defined(CONFIG_senTec) || defined(CONFIG_SNEHA) || defined(CONFIG_AVNET)
#define	CONSOLE_BAUD_RATE	19200
#define	DEFAULT_CBAUD		B19200
#endif

#ifndef CONSOLE_BAUD_RATE
#define	CONSOLE_BAUD_RATE	9600
#define	DEFAULT_CBAUD		B9600
#endif

int mcfrs_console_inited = 0;
int mcfrs_console_port = -1;
int mcfrs_console_baud = CONSOLE_BAUD_RATE;
int mcfrs_console_cbaud = DEFAULT_CBAUD;

/*
 *	Driver data structures.
 */
static struct tty_driver *mcfrs_serial_driver;

/* number of characters left in xmit buffer before we ask for more */
#define WAKEUP_CHARS 256

/* Debugging...
 */
#undef SERIAL_DEBUG_OPEN
#undef SERIAL_DEBUG_FLOW

#if defined(CONFIG_M523x) || defined(CONFIG_M527x) || defined(CONFIG_M528x) || \
    defined(CONFIG_M520x) || defined(CONFIG_M532x)
#define	IRQBASE	(MCFINT_VECBASE+MCFINT_UART0)
#else
#define	IRQBASE	73
#endif

/*
 *	Configuration table, UARTs to look for at startup.
 */
static struct mcf_serial mcfrs_table[] = {
	{  /* ttyS0 */
		.magic = 0,
		.addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE1),
		.irq = IRQBASE,
		.flags = ASYNC_BOOT_AUTOCONF,
	},
#ifdef MCFUART_BASE2
	{  /* ttyS1 */
		.magic = 0,
		.addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE2),
		.irq = IRQBASE+1,
		.flags = ASYNC_BOOT_AUTOCONF,
	},
#endif
#ifdef MCFUART_BASE3
	{  /* ttyS2 */
		.magic = 0,
		.addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE3),
		.irq = IRQBASE+2,
		.flags = ASYNC_BOOT_AUTOCONF,
	},
#endif
#ifdef MCFUART_BASE4
	{  /* ttyS3 */
		.magic = 0,
		.addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE4),
		.irq = IRQBASE+3,
		.flags = ASYNC_BOOT_AUTOCONF,
	},
#endif
};


#define	NR_PORTS	(sizeof(mcfrs_table) / sizeof(struct mcf_serial))

/*
 * This is used to figure out the divisor speeds and the timeouts.
 */
static int mcfrs_baud_table[] = {
	0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
	9600, 19200, 38400, 57600, 115200, 230400, 460800, 0
};
#define MCFRS_BAUD_TABLE_SIZE \
			(sizeof(mcfrs_baud_table)/sizeof(mcfrs_baud_table[0]))


#ifdef CONFIG_MAGIC_SYSRQ
/*
 *	Magic system request keys. Used for debugging...
 */
extern int	magic_sysrq_key(int ch);
#endif


/*
 *	Forware declarations...
 */
static void	mcfrs_change_speed(struct mcf_serial *info);
static void	mcfrs_wait_until_sent(struct tty_struct *tty, int timeout);


static inline int serial_paranoia_check(struct mcf_serial *info,
					char *name, const char *routine)
{
#ifdef SERIAL_PARANOIA_CHECK
	static const char badmagic[] =
		"MCFRS(warning): bad magic number for serial struct %s in %s\n";
	static const char badinfo[] =
		"MCFRS(warning): null mcf_serial for %s in %s\n";

	if (!info) {
		printk(badinfo, name, routine);
		return 1;
	}
	if (info->magic != SERIAL_MAGIC) {
		printk(badmagic, name, routine);
		return 1;
	}
#endif
	return 0;
}

/*
 *	Sets or clears DTR and RTS on the requested line.
 */
static void mcfrs_setsignals(struct mcf_serial *info, int dtr, int rts)
{
	volatile unsigned char	*uartp;
	unsigned long		flags;
	
#if 0
	printk("%s(%d): mcfrs_setsignals(info=%x,dtr=%d,rts=%d)\n",
		__FILE__, __LINE__, info, dtr, rts);
#endif

	local_irq_save(flags);
	if (dtr >= 0) {
#ifdef MCFPP_DTR0
		if (info->line)
			mcf_setppdata(MCFPP_DTR1, (dtr ? 0 : MCFPP_DTR1));
		else
			mcf_setppdata(MCFPP_DTR0, (dtr ? 0 : MCFPP_DTR0));
#endif
	}
	if (rts >= 0) {
		uartp = info->addr;
		if (rts) {
			info->sigs |= TIOCM_RTS;
			uartp[MCFUART_UOP1] = MCFUART_UOP_RTS;
		} else {
			info->sigs &= ~TIOCM_RTS;
			uartp[MCFUART_UOP0] = MCFUART_UOP_RTS;
		}
	}
	local_irq_restore(flags);
	return;
}

/*
 *	Gets values of serial signals.
 */
static int mcfrs_getsignals(struct mcf_serial *info)
{
	volatile unsigned char	*uartp;
	unsigned long		flags;
	int			sigs;
#if defined(CONFIG_NETtel) && defined(CONFIG_M5307)
	unsigned short		ppdata;
#endif

#if 0
	printk("%s(%d): mcfrs_getsignals(info=%x)\n", __FILE__, __LINE__);
#endif

	local_irq_save(flags);
	uartp = info->addr;
	sigs = (uartp[MCFUART_UIPR] & MCFUART_UIPR_CTS) ? 0 : TIOCM_CTS;
	sigs |= (info->sigs & TIOCM_RTS);

#ifdef MCFPP_DCD0
{
	unsigned int ppdata;
	ppdata = mcf_getppdata();
	if (info->line == 0) {
		sigs |= (ppdata & MCFPP_DCD0) ? 0 : TIOCM_CD;
		sigs |= (ppdata & MCFPP_DTR0) ? 0 : TIOCM_DTR;
	} else if (info->line == 1) {
		sigs |= (ppdata & MCFPP_DCD1) ? 0 : TIOCM_CD;
		sigs |= (ppdata & MCFPP_DTR1) ? 0 : TIOCM_DTR;
	}
}
#endif

	local_irq_restore(flags);
	return(sigs);
}

/*
 * ------------------------------------------------------------
 * mcfrs_stop() and mcfrs_start()
 *
 * This routines are called before setting or resetting tty->stopped.
 * They enable or disable transmitter interrupts, as necessary.
 * ------------------------------------------------------------
 */
static void mcfrs_stop(struct tty_struct *tty)
{
	volatile unsigned char	*uartp;
	struct mcf_serial	*info = (struct mcf_serial *)tty->driver_data;
	unsigned long		flags;

	if (serial_paranoia_check(info, tty->name, "mcfrs_stop"))
		return;
	
	local_irq_save(flags);
	uartp = info->addr;
	info->imr &= ~MCFUART_UIR_TXREADY;
	uartp[MCFUART_UIMR] = info->imr;
	local_irq_restore(flags);
}

static void mcfrs_start(struct tty_struct *tty)
{
	volatile unsigned char	*uartp;
	struct mcf_serial	*info = (struct mcf_serial *)tty->driver_data;
	unsigned long		flags;
	
	if (serial_paranoia_check(info, tty->name, "mcfrs_start"))
		return;

	local_irq_save(flags);
	if (info->xmit_cnt && info->xmit_buf) {
		uartp = info->addr;
		info->imr |= MCFUART_UIR_TXREADY;
		uartp[MCFUART_UIMR] = info->imr;
	}
	local_irq_restore(flags);
}

/*
 * ----------------------------------------------------------------------
 *
 * Here starts the interrupt handling routines.  All of the following
 * subroutines are declared as inline and are folded into
 * mcfrs_interrupt().  They were separated out for readability's sake.
 *
 * Note: mcfrs_interrupt() is a "fast" interrupt, which means that it
 * runs with interrupts turned off.  People who may want to modify
 * mcfrs_interrupt() should try to keep the interrupt handler as fast as
 * possible.  After you are done making modifications, it is not a bad
 * idea to do:
 * 
 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
 *
 * and look at the resulting assemble code in serial.s.
 *
 * 				- Ted Ts'o (tytso@mit.edu), 7-Mar-93
 * -----------------------------------------------------------------------
 */

static inline void receive_chars(struct mcf_serial *info)
{
	volatile unsigned char	*uartp;
	struct tty_struct	*tty = info->tty;
	unsigned char		status, ch, flag;

	if (!tty)
		return;

	uartp = info->addr;

	while ((status = uartp[MCFUART_USR]) & MCFUART_USR_RXREADY) {
		ch = uartp[MCFUART_URB];
		info->stats.rx++;

#ifdef CONFIG_MAGIC_SYSRQ
		if (mcfrs_console_inited && (info->line == mcfrs_console_port)) {
			if (magic_sysrq_key(ch))
				continue;
		}
#endif

		flag = TTY_NORMAL;
		if (status & MCFUART_USR_RXERR) {
			uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETERR;
			if (status & MCFUART_USR_RXBREAK) {
				info->stats.rxbreak++;
				flag = TTY_BREAK;
			} else if (status & MCFUART_USR_RXPARITY) {
				info->stats.rxparity++;
				flag = TTY_PARITY;
			} else if (status & MCFUART_USR_RXOVERRUN) {
				info->stats.rxoverrun++;
				flag = TTY_OVERRUN;
			} else if (status & MCFUART_USR_RXFRAMING) {
				info->stats.rxframing++;
				flag = TTY_FRAME;
			}
		}
		tty_insert_flip_char(tty, ch, flag);
	}
	tty_schedule_flip(tty);
	return;
}

static inline void transmit_chars(struct mcf_serial *info)
{
	volatile unsigned char	*uartp;

	uartp = info->addr;

	if (info->x_char) {
		/* Send special char - probably flow control */
		uartp[MCFUART_UTB] = info->x_char;
		info->x_char = 0;
		info->stats.tx++;
	}

	if ((info->xmit_cnt <= 0) || info->tty->stopped) {
		info->imr &= ~MCFUART_UIR_TXREADY;
		uartp[MCFUART_UIMR] = info->imr;
		return;
	}

	while (uartp[MCFUART_USR] & MCFUART_USR_TXREADY) {
		uartp[MCFUART_UTB] = info->xmit_buf[info->xmit_tail++];
		info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
		info->stats.tx++;
		if (--info->xmit_cnt <= 0)
			break;
	}

	if (info->xmit_cnt < WAKEUP_CHARS)
		schedule_work(&info->tqueue);
	return;
}

/*
 * This is the serial driver's generic interrupt routine
 */
irqreturn_t mcfrs_interrupt(int irq, void *dev_id)
{
	struct mcf_serial	*info;
	unsigned char		isr;

	info = &mcfrs_table[(irq - IRQBASE)];
	isr = info->addr[MCFUART_UISR] & info->imr;

	if (isr & MCFUART_UIR_RXREADY)
		receive_chars(info);
	if (isr & MCFUART_UIR_TXREADY)
		transmit_chars(info);
	return IRQ_HANDLED;
}

/*
 * -------------------------------------------------------------------
 * Here ends the serial interrupt routines.
 * -------------------------------------------------------------------
 */

static void mcfrs_offintr(void *private)
{
	struct mcf_serial	*info = (struct mcf_serial *) private;
	struct tty_struct	*tty;
	
	tty = info->tty;
	if (!tty)
		return;
	tty_wakeup(tty);
}


/*
 *	Change of state on a DCD line.
 */
void mcfrs_modem_change(struct mcf_serial *info, int dcd)
{
	if (info->count == 0)
		return;

	if (info->flags & ASYNC_CHECK_CD) {
		if (dcd)
			wake_up_interruptible(&info->open_wait);
		else 
			schedule_work(&info->tqueue_hangup);
	}
}


#ifdef MCFPP_DCD0

unsigned short	mcfrs_ppstatus;

/*
 * This subroutine is called when the RS_TIMER goes off. It is used
 * to monitor the state of the DCD lines - since they have no edge
 * sensors and interrupt generators.
 */
static void mcfrs_timer(void)
{
	unsigned int	ppstatus, dcdval, i;

	ppstatus = mcf_getppdata() & (MCFPP_DCD0 | MCFPP_DCD1);

	if (ppstatus != mcfrs_ppstatus) {
		for (i = 0; (i < 2); i++) {
			dcdval = (i ? MCFPP_DCD1 : MCFPP_DCD0);
			if ((ppstatus & dcdval) != (mcfrs_ppstatus & dcdval)) {
				mcfrs_modem_change(&mcfrs_table[i],
					((ppstatus & dcdval) ? 0 : 1));
			}
		}
	}
	mcfrs_ppstatus = ppstatus;

	/* Re-arm timer */
	mcfrs_timer_struct.expires = jiffies + HZ/25;
	add_timer(&mcfrs_timer_struct);
}

#endif	/* MCFPP_DCD0 */


/*
 * This routine is called from the scheduler tqueue when the interrupt
 * routine has signalled that a hangup has occurred. The path of
 * hangup processing is:
 *
 * 	serial interrupt routine -> (scheduler tqueue) ->
 * 	do_serial_hangup() -> tty->hangup() -> mcfrs_hangup()
 * 
 */
static void do_serial_hangup(void *private)
{
	struct mcf_serial	*info = (struct mcf_serial *) private;
	struct tty_struct	*tty;
	
	tty = info->tty;
	if (!tty)
		return;

	tty_hangup(tty);
}

static int startup(struct mcf_serial * info)
{
	volatile unsigned char	*uartp;
	unsigned long		flags;
	
	if (info->flags & ASYNC_INITIALIZED)
		return 0;

	if (!info->xmit_buf) {
		info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
		if (!info->xmit_buf)
			return -ENOMEM;
	}

	local_irq_save(flags);

#ifdef SERIAL_DEBUG_OPEN
	printk("starting up ttyS%d (irq %d)...\n", info->line, info->irq);
#endif

	/*
	 *	Reset UART, get it into known state...
	 */
	uartp = info->addr;
	uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX;  /* reset RX */
	uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX;  /* reset TX */
	mcfrs_setsignals(info, 1, 1);

	if (info->tty)
		clear_bit(TTY_IO_ERROR, &info->tty->flags);
	info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;

	/*
	 * and set the speed of the serial port
	 */
	mcfrs_change_speed(info);

	/*
	 * Lastly enable the UART transmitter and receiver, and
	 * interrupt enables.
	 */
	info->imr = MCFUART_UIR_RXREADY;
	uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE;
	uartp[MCFUART_UIMR] = info->imr;

	info->flags |= ASYNC_INITIALIZED;
	local_irq_restore(flags);
	return 0;
}

/*
 * This routine will shutdown a serial port; interrupts are disabled, and
 * DTR is dropped if the hangup on close termio flag is on.
 */
static void shutdown(struct mcf_serial * info)
{
	volatile unsigned char	*uartp;
	unsigned long		flags;

	if (!(info->flags & ASYNC_INITIALIZED))
		return;

#ifdef SERIAL_DEBUG_OPEN
	printk("Shutting down serial port %d (irq %d)....\n", info->line,
	       info->irq);
#endif
	
	local_irq_save(flags);

	uartp = info->addr;
	uartp[MCFUART_UIMR] = 0;  /* mask all interrupts */
	uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX;  /* reset RX */
	uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX;  /* reset TX */

	if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
		mcfrs_setsignals(info, 0, 0);

	if (info->xmit_buf) {
		free_page((unsigned long) info->xmit_buf);
		info->xmit_buf = 0;
	}

	if (info->tty)
		set_bit(TTY_IO_ERROR, &info->tty->flags);
	
	info->flags &= ~ASYNC_INITIALIZED;
	local_irq_restore(flags);
}


/*
 * This routine is called to set the UART divisor registers to match
 * the specified baud rate for a serial port.
 */
static void mcfrs_change_speed(struct mcf_serial *info)
{
	volatile unsigned char	*uartp;
	unsigned int		baudclk, cflag;
	unsigned long		flags;
	unsigned char		mr1, mr2;
	int			i;
#ifdef	CONFIG_M5272
	unsigned int		fraction;
#endif

	if (!info->tty || !info->tty->termios)
		return;
	cflag = info->tty->termios->c_cflag;
	if (info->addr == 0)
		return;

#if 0
	printk("%s(%d): mcfrs_change_speed()\n", __FILE__, __LINE__);
#endif

	i = cflag & CBAUD;
	if (i & CBAUDEX) {
		i &= ~CBAUDEX;
		if (i < 1 || i > 4)
			info->tty->termios->c_cflag &= ~CBAUDEX;
		else
			i += 15;
	}
	if (i == 0) {
		mcfrs_setsignals(info, 0, -1);
		return;
	}

	/* compute the baudrate clock */
#ifdef	CONFIG_M5272
	/*
	 * For the MCF5272, also compute the baudrate fraction.
	 */
	baudclk = (MCF_BUSCLK / mcfrs_baud_table[i]) / 32;
	fraction = MCF_BUSCLK - (baudclk * 32 * mcfrs_baud_table[i]);
	fraction *= 16;
	fraction /= (32 * mcfrs_baud_table[i]);
#else
	baudclk = ((MCF_BUSCLK / mcfrs_baud_table[i]) + 16) / 32;
#endif

	info->baud = mcfrs_baud_table[i];

	mr1 = MCFUART_MR1_RXIRQRDY | MCFUART_MR1_RXERRCHAR;
	mr2 = 0;

	switch (cflag & CSIZE) {
	case CS5:	mr1 |= MCFUART_MR1_CS5; break;
	case CS6:	mr1 |= MCFUART_MR1_CS6; break;
	case CS7:	mr1 |= MCFUART_MR1_CS7; break;
	case CS8:
	default:	mr1 |= MCFUART_MR1_CS8; break;
	}

	if (cflag & PARENB) {
		if (cflag & CMSPAR) {
			if (cflag & PARODD)
				mr1 |= MCFUART_MR1_PARITYMARK;
			else
				mr1 |= MCFUART_MR1_PARITYSPACE;
		} else {
			if (cflag & PARODD)
				mr1 |= MCFUART_MR1_PARITYODD;
			else
				mr1 |= MCFUART_MR1_PARITYEVEN;
		}
	} else {
		mr1 |= MCFUART_MR1_PARITYNONE;
	}

	if (cflag & CSTOPB)
		mr2 |= MCFUART_MR2_STOP2;
	else
		mr2 |= MCFUART_MR2_STOP1;

	if (cflag & CRTSCTS) {
		mr1 |= MCFUART_MR1_RXRTS;
		mr2 |= MCFUART_MR2_TXCTS;
	}

	if (cflag & CLOCAL)
		info->flags &= ~ASYNC_CHECK_CD;
	else
		info->flags |= ASYNC_CHECK_CD;

	uartp = info->addr;

	local_irq_save(flags);
#if 0
	printk("%s(%d): mr1=%x mr2=%x baudclk=%x\n", __FILE__, __LINE__,
		mr1, mr2, baudclk);
#endif
	/*
	  Note: pg 12-16 of MCF5206e User's Manual states that a
	  software reset should be performed prior to changing
	  UMR1,2, UCSR, UACR, bit 7
	*/
	uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX;    /* reset RX */
	uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX;    /* reset TX */
	uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETMRPTR;	/* reset MR pointer */
	uartp[MCFUART_UMR] = mr1;
	uartp[MCFUART_UMR] = mr2;
	uartp[MCFUART_UBG1] = (baudclk & 0xff00) >> 8;	/* set msb byte */
	uartp[MCFUART_UBG2] = (baudclk & 0xff);		/* set lsb byte */
#ifdef	CONFIG_M5272
	uartp[MCFUART_UFPD] = (fraction & 0xf);		/* set fraction */
#endif
	uartp[MCFUART_UCSR] = MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER;
	uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE;
	mcfrs_setsignals(info, 1, -1);
	local_irq_restore(flags);
	return;
}

static void mcfrs_flush_chars(struct tty_struct *tty)
{
	volatile unsigned char	*uartp;
	struct mcf_serial	*info = (struct mcf_serial *)tty->driver_data;
	unsigned long		flags;

	if (serial_paranoia_check(info, tty->name, "mcfrs_flush_chars"))
		return;

	uartp = (volatile unsigned char *) info->addr;

	/*
	 * re-enable receiver interrupt
	 */
	local_irq_save(flags);
	if ((!(info->imr & MCFUART_UIR_RXREADY)) &&
	    (info->flags & ASYNC_INITIALIZED) ) {
		info->imr |= MCFUART_UIR_RXREADY;
		uartp[MCFUART_UIMR] = info->imr;
	}
	local_irq_restore(flags);

	if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
	    !info->xmit_buf)
		return;

	/* Enable transmitter */
	local_irq_save(flags);
	info->imr |= MCFUART_UIR_TXREADY;
	uartp[MCFUART_UIMR] = info->imr;
	local_irq_restore(flags);
}

static int mcfrs_write(struct tty_struct * tty,
		    const unsigned char *buf, int count)
{
	volatile unsigned char	*uartp;
	struct mcf_serial	*info = (struct mcf_serial *)tty->driver_data;
	unsigned long		flags;
	int			c, total = 0;

#if 0
	printk("%s(%d): mcfrs_write(tty=%x,buf=%x,count=%d)\n",
		__FILE__, __LINE__, (int)tty, (int)buf, count);
#endif

	if (serial_paranoia_check(info, tty->name, "mcfrs_write"))
		return 0;

	if (!tty || !info->xmit_buf)
		return 0;
	
	local_save_flags(flags);
	while (1) {
		local_irq_disable();		
		c = min(count, (int) min(((int)SERIAL_XMIT_SIZE) - info->xmit_cnt - 1,
			((int)SERIAL_XMIT_SIZE) - info->xmit_head));
		local_irq_restore(flags);

		if (c <= 0)
			break;

		memcpy(info->xmit_buf + info->xmit_head, buf, c);

		local_irq_disable();
		info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
		info->xmit_cnt += c;
		local_irq_restore(flags);

		buf += c;
		count -= c;
		total += c;
	}

	local_irq_disable();
	uartp = info->addr;
	info->imr |= MCFUART_UIR_TXREADY;
	uartp[MCFUART_UIMR] = info->imr;
	local_irq_restore(flags);

	return total;
}

static int mcfrs_write_room(struct tty_struct *tty)
{
	struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
	int	ret;

	if (serial_paranoia_check(info, tty->name, "mcfrs_write_room"))
		return 0;
	ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
	if (ret < 0)
		ret = 0;
	return ret;
}

static int mcfrs_chars_in_buffer(struct tty_struct *tty)
{
	struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;

	if (serial_paranoia_check(info, tty->name, "mcfrs_chars_in_buffer"))
		return 0;
	return info->xmit_cnt;
}

static void mcfrs_flush_buffer(struct tty_struct *tty)
{
	struct mcf_serial	*info = (struct mcf_serial *)tty->driver_data;
	unsigned long		flags;

	if (serial_paranoia_check(info, tty->name, "mcfrs_flush_buffer"))
		return;

	local_irq_save(flags);
	info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
	local_irq_restore(flags);

	tty_wakeup(tty);
}

/*
 * ------------------------------------------------------------
 * mcfrs_throttle()
 * 
 * This routine is called by the upper-layer tty layer to signal that
 * incoming characters should be throttled.
 * ------------------------------------------------------------
 */
static void mcfrs_throttle(struct tty_struct * tty)
{
	struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
#ifdef SERIAL_DEBUG_THROTTLE
	char	buf[64];
	
	printk("throttle %s: %d....\n", _tty_name(tty, buf),
	       tty->ldisc.chars_in_buffer(tty));
#endif

	if (serial_paranoia_check(info, tty->name, "mcfrs_throttle"))
		return;
	
	if (I_IXOFF(tty))
		info->x_char = STOP_CHAR(tty);

	/* Turn off RTS line (do this atomic) */
}

static void mcfrs_unthrottle(struct tty_struct * tty)
{
	struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
#ifdef SERIAL_DEBUG_THROTTLE
	char	buf[64];
	
	printk("unthrottle %s: %d....\n", _tty_name(tty, buf),
	       tty->ldisc.chars_in_buffer(tty));
#endif

	if (serial_paranoia_check(info, tty->name, "mcfrs_unthrottle"))
		return;
	
	if (I_IXOFF(tty)) {
		if (info->x_char)
			info->x_char = 0;
		else
			info->x_char = START_CHAR(tty);
	}

	/* Assert RTS line (do this atomic) */
}

/*
 * ------------------------------------------------------------
 * mcfrs_ioctl() and friends
 * ------------------------------------------------------------
 */

static int get_serial_info(struct mcf_serial * info,
			   struct serial_struct * retinfo)
{
	struct serial_struct tmp;
  
	if (!retinfo)
		return -EFAULT;
	memset(&tmp, 0, sizeof(tmp));
	tmp.type = info->type;
	tmp.line = info->line;
	tmp.port = (unsigned int) info->addr;
	tmp.irq = info->irq;
	tmp.flags = info->flags;
	tmp.baud_base = info->baud_base;
	tmp.close_delay = info->close_delay;
	tmp.closing_wait = info->closing_wait;
	tmp.custom_divisor = info->custom_divisor;
	return copy_to_user(retinfo,&tmp,sizeof(*retinfo)) ? -EFAULT : 0;
}

static int set_serial_info(struct mcf_serial * info,
			   struct serial_struct * new_info)
{
	struct serial_struct new_serial;
	struct mcf_serial old_info;
	int 	retval = 0;

	if (!new_info)
		return -EFAULT;
	if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
		return -EFAULT;
	old_info = *info;

	if (!capable(CAP_SYS_ADMIN)) {
		if ((new_serial.baud_base != info->baud_base) ||
		    (new_serial.type != info->type) ||
		    (new_serial.close_delay != info->close_delay) ||
		    ((new_serial.flags & ~ASYNC_USR_MASK) !=
		     (info->flags & ~ASYNC_USR_MASK)))
			return -EPERM;
		info->flags = ((info->flags & ~ASYNC_USR_MASK) |
			       (new_serial.flags & ASYNC_USR_MASK));
		info->custom_divisor = new_serial.custom_divisor;
		goto check_and_exit;
	}

	if (info->count > 1)
		return -EBUSY;

	/*
	 * OK, past this point, all the error checking has been done.
	 * At this point, we start making changes.....
	 */

	info->baud_base = new_serial.baud_base;
	info->flags = ((info->flags & ~ASYNC_FLAGS) |
			(new_serial.flags & ASYNC_FLAGS));
	info->type = new_serial.type;
	info->close_delay = new_serial.close_delay;
	info->closing_wait = new_serial.closing_wait;

check_and_exit:
	retval = startup(info);
	return retval;
}

/*
 * get_lsr_info - get line status register info
 *
 * Purpose: Let user call ioctl() to get info when the UART physically
 * 	    is emptied.  On bus types like RS485, the transmitter must
 * 	    release the bus after transmitting. This must be done when
 * 	    the transmit shift register is empty, not be done when the
 * 	    transmit holding register is empty.  This functionality
 * 	    allows an RS485 driver to be written in user space. 
 */
static int get_lsr_info(struct mcf_serial * info, unsigned int *value)
{
	volatile unsigned char	*uartp;
	unsigned long		flags;
	unsigned char		status;

	local_irq_save(flags);
	uartp = info->addr;
	status = (uartp[MCFUART_USR] & MCFUART_USR_TXEMPTY) ? TIOCSER_TEMT : 0;
	local_irq_restore(flags);

	return put_user(status,value);
}

/*
 * This routine sends a break character out the serial port.
 */
static void send_break(	struct mcf_serial * info, int duration)
{
	volatile unsigned char	*uartp;
	unsigned long		flags;

	if (!info->addr)
		return;
	set_current_state(TASK_INTERRUPTIBLE);
	uartp = info->addr;

	local_irq_save(flags);
	uartp[MCFUART_UCR] = MCFUART_UCR_CMDBREAKSTART;
	schedule_timeout(duration);
	uartp[MCFUART_UCR] = MCFUART_UCR_CMDBREAKSTOP;
	local_irq_restore(flags);
}

static int mcfrs_tiocmget(struct tty_struct *tty, struct file *file)
{
	struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;

	if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl"))
		return -ENODEV;
	if (tty->flags & (1 << TTY_IO_ERROR))
		return -EIO;

	return mcfrs_getsignals(info);
}

static int mcfrs_tiocmset(struct tty_struct *tty, struct file *file,
			  unsigned int set, unsigned int clear)
{
	struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
	int rts = -1, dtr = -1;

	if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl"))
		return -ENODEV;
	if (tty->flags & (1 << TTY_IO_ERROR))
		return -EIO;

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

	mcfrs_setsignals(info, dtr, rts);

	return 0;
}

static int mcfrs_ioctl(struct tty_struct *tty, struct file * file,
		    unsigned int cmd, unsigned long arg)
{
	struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
	int retval, error;

	if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl"))
		return -ENODEV;

	if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
	    (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD)  &&
	    (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
		if (tty->flags & (1 << TTY_IO_ERROR))
		    return -EIO;
	}
	
	switch (cmd) {
		case TCSBRK:	/* SVID version: non-zero arg --> no break */
			retval = tty_check_change(tty);
			if (retval)
				return retval;
			tty_wait_until_sent(tty, 0);
			if (!arg)
				send_break(info, HZ/4);	/* 1/4 second */
			return 0;
		case TCSBRKP:	/* support for POSIX tcsendbreak() */
			retval = tty_check_change(tty);
			if (retval)
				return retval;
			tty_wait_until_sent(tty, 0);
			send_break(info, arg ? arg*(HZ/10) : HZ/4);
			return 0;
		case TIOCGSOFTCAR:
			error = put_user(C_CLOCAL(tty) ? 1 : 0,
				    (unsigned long *) arg);
			if (error)
				return error;
			return 0;
		case TIOCSSOFTCAR:
			get_user(arg, (unsigned long *) arg);
			tty->termios->c_cflag =
				((tty->termios->c_cflag & ~CLOCAL) |
				 (arg ? CLOCAL : 0));
			return 0;
		case TIOCGSERIAL:
			if (access_ok(VERIFY_WRITE, (void *) arg,
						sizeof(struct serial_struct)))
				return get_serial_info(info,
					       (struct serial_struct *) arg);
			return -EFAULT;
		case TIOCSSERIAL:
			return set_serial_info(info,
					       (struct serial_struct *) arg);
		case TIOCSERGETLSR: /* Get line status register */
			if (access_ok(VERIFY_WRITE, (void *) arg,
						sizeof(unsigned int)))
				return get_lsr_info(info, (unsigned int *) arg);
			return -EFAULT;
		case TIOCSERGSTRUCT:
			error = copy_to_user((struct mcf_serial *) arg,
				    info, sizeof(struct mcf_serial));
			if (error)
				return -EFAULT;
			return 0;
			
#ifdef TIOCSET422
		case TIOCSET422: {
			unsigned int val;
			get_user(val, (unsigned int *) arg);
			mcf_setpa(MCFPP_PA11, (val ? 0 : MCFPP_PA11));
			break;
		}
		case TIOCGET422: {
			unsigned int val;
			val = (mcf_getpa() & MCFPP_PA11) ? 0 : 1;
			put_user(val, (unsigned int *) arg);
			break;
		}
#endif

		default:
			return -ENOIOCTLCMD;
		}
	return 0;
}

static void mcfrs_set_termios(struct tty_struct *tty, struct termios *old_termios)
{
	struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;

	if (tty->termios->c_cflag == old_termios->c_cflag)
		return;

	mcfrs_change_speed(info);

	if ((old_termios->c_cflag & CRTSCTS) &&
	    !(tty->termios->c_cflag & CRTSCTS)) {
		tty->hw_stopped = 0;
		mcfrs_setsignals(info, -1, 1);
#if 0
		mcfrs_start(tty);
#endif
	}
}

/*
 * ------------------------------------------------------------
 * mcfrs_close()
 * 
 * This routine is called when the serial port gets closed.  First, we
 * wait for the last remaining data to be sent.  Then, we unlink its
 * S structure from the interrupt chain if necessary, and we free
 * that IRQ if nothing is left in the chain.
 * ------------------------------------------------------------
 */
static void mcfrs_close(struct tty_struct *tty, struct file * filp)
{
	volatile unsigned char	*uartp;
	struct mcf_serial	*info = (struct mcf_serial *)tty->driver_data;
	unsigned long		flags;

	if (!info || serial_paranoia_check(info, tty->name, "mcfrs_close"))
		return;
	
	local_irq_save(flags);
	
	if (tty_hung_up_p(filp)) {
		local_irq_restore(flags);
		return;
	}
	
#ifdef SERIAL_DEBUG_OPEN
	printk("mcfrs_close ttyS%d, count = %d\n", info->line, info->count);
#endif
	if ((tty->count == 1) && (info->count != 1)) {
		/*
		 * Uh, oh.  tty->count is 1, which means that the tty
		 * structure will be freed.  Info->count should always
		 * be one in these conditions.  If it's greater than
		 * one, we've got real problems, since it means the
		 * serial port won't be shutdown.
		 */
		printk("MCFRS: bad serial port count; tty->count is 1, "
		       "info->count is %d\n", info->count);
		info->count = 1;
	}
	if (--info->count < 0) {
		printk("MCFRS: bad serial port count for ttyS%d: %d\n",
		       info->line, info->count);
		info->count = 0;
	}
	if (info->count) {
		local_irq_restore(flags);
		return;
	}
	info->flags |= ASYNC_CLOSING;

	/*
	 * Now we wait for the transmit buffer to clear; and we notify 
	 * the line discipline to only process XON/XOFF characters.
	 */
	tty->closing = 1;
	if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
		tty_wait_until_sent(tty, info->closing_wait);

	/*
	 * At this point we stop accepting input.  To do this, we
	 * disable the receive line status interrupts, and tell the
	 * interrupt driver to stop checking the data ready bit in the
	 * line status register.
	 */
	info->imr &= ~MCFUART_UIR_RXREADY;
	uartp = info->addr;
	uartp[MCFUART_UIMR] = info->imr;

#if 0
	/* FIXME: do we need to keep this enabled for console?? */
	if (mcfrs_console_inited && (mcfrs_console_port == info->line)) {
		/* Do not disable the UART */ ;
	} else
#endif
	shutdown(info);
	if (tty->driver->flush_buffer)
		tty->driver->flush_buffer(tty);
	tty_ldisc_flush(tty);
	
	tty->closing = 0;
	info->event = 0;
	info->tty = 0;
#if 0	
	if (tty->ldisc.num != ldiscs[N_TTY].num) {
		if (tty->ldisc.close)
			(tty->ldisc.close)(tty);
		tty->ldisc = ldiscs[N_TTY];
		tty->termios->c_line = N_TTY;
		if (tty->ldisc.open)
			(tty->ldisc.open)(tty);
	}
#endif	
	if (info->blocked_open) {
		if (info->close_delay) {
			msleep_interruptible(jiffies_to_msecs(info->close_delay));
		}
		wake_up_interruptible(&info->open_wait);
	}
	info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
	wake_up_interruptible(&info->close_wait);
	local_irq_restore(flags);
}

/*
 * mcfrs_wait_until_sent() --- wait until the transmitter is empty
 */
static void
mcfrs_wait_until_sent(struct tty_struct *tty, int timeout)
{
#ifdef	CONFIG_M5272
#define	MCF5272_FIFO_SIZE	25		/* fifo size + shift reg */

	struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
	volatile unsigned char *uartp;
	unsigned long orig_jiffies, fifo_time, char_time, fifo_cnt;

	if (serial_paranoia_check(info, tty->name, "mcfrs_wait_until_sent"))
		return;

	orig_jiffies = jiffies;

	/*
	 * Set the check interval to be 1/5 of the approximate time
	 * to send the entire fifo, and make it at least 1.  The check
	 * interval should also be less than the timeout.
	 *
	 * Note: we have to use pretty tight timings here to satisfy
	 * the NIST-PCTS.
	 */
	fifo_time = (MCF5272_FIFO_SIZE * HZ * 10) / info->baud;
	char_time = fifo_time / 5;
	if (char_time == 0)
		char_time = 1;
	if (timeout && timeout < char_time)
		char_time = timeout;

	/*
	 * Clamp the timeout period at 2 * the time to empty the
	 * fifo.  Just to be safe, set the minimum at .5 seconds.
	 */
	fifo_time *= 2;
	if (fifo_time < (HZ/2))
		fifo_time = HZ/2;
	if (!timeout || timeout > fifo_time)
		timeout = fifo_time;

	/*
	 * Account for the number of bytes in the UART
	 * transmitter FIFO plus any byte being shifted out.
	 */
	uartp = (volatile unsigned char *) info->addr;
	for (;;) {
		fifo_cnt = (uartp[MCFUART_UTF] & MCFUART_UTF_TXB);
		if ((uartp[MCFUART_USR] & (MCFUART_USR_TXREADY|
				MCFUART_USR_TXEMPTY)) ==
			MCFUART_USR_TXREADY)
			fifo_cnt++;
		if (fifo_cnt == 0)
			break;
		msleep_interruptible(jiffies_to_msecs(char_time));
		if (signal_pending(current))
			break;
		if (timeout && time_after(jiffies, orig_jiffies + timeout))
			break;
	}
#else
	/*
	 * For the other coldfire models, assume all data has been sent
	 */
#endif
}

/*
 * mcfrs_hangup() --- called by tty_hangup() when a hangup is signaled.
 */
void mcfrs_hangup(struct tty_struct *tty)
{
	struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
	
	if (serial_paranoia_check(info, tty->name, "mcfrs_hangup"))
		return;
	
	mcfrs_flush_buffer(tty);
	shutdown(info);
	info->event = 0;
	info->count = 0;
	info->flags &= ~ASYNC_NORMAL_ACTIVE;
	info->tty = 0;
	wake_up_interruptible(&info->open_wait);
}

/*
 * ------------------------------------------------------------
 * mcfrs_open() and friends
 * ------------------------------------------------------------
 */
static int block_til_ready(struct tty_struct *tty, struct file * filp,
			   struct mcf_serial *info)
{
	DECLARE_WAITQUEUE(wait, current);
	int	retval;
	int	do_clocal = 0;

	/*
	 * If the device is in the middle of being closed, then block
	 * until it's done, and then try again.
	 */
	if (info->flags & ASYNC_CLOSING) {
		interruptible_sleep_on(&info->close_wait);
#ifdef SERIAL_DO_RESTART
		if (info->flags & ASYNC_HUP_NOTIFY)
			return -EAGAIN;
		else
			return -ERESTARTSYS;
#else
		return -EAGAIN;
#endif
	}
	
	/*
	 * If non-blocking mode is set, or the port is not enabled,
	 * then make the check up front and then exit.
	 */
	if ((filp->f_flags & O_NONBLOCK) ||
	    (tty->flags & (1 << TTY_IO_ERROR))) {
		info->flags |= ASYNC_NORMAL_ACTIVE;
		return 0;
	}

	if (tty->termios->c_cflag & CLOCAL)
		do_clocal = 1;

	/*
	 * Block waiting for the carrier detect and the line to become
	 * free (i.e., not in use by the callout).  While we are in
	 * this loop, info->count is dropped by one, so that
	 * mcfrs_close() knows when to free things.  We restore it upon
	 * exit, either normal or abnormal.
	 */
	retval = 0;
	add_wait_queue(&info->open_wait, &wait);
#ifdef SERIAL_DEBUG_OPEN
	printk("block_til_ready before block: ttyS%d, count = %d\n",
	       info->line, info->count);
#endif
	info->count--;
	info->blocked_open++;
	while (1) {
		local_irq_disable();
		mcfrs_setsignals(info, 1, 1);
		local_irq_enable();
		current->state = TASK_INTERRUPTIBLE;
		if (tty_hung_up_p(filp) ||
		    !(info->flags & ASYNC_INITIALIZED)) {
#ifdef SERIAL_DO_RESTART
			if (info->flags & ASYNC_HUP_NOTIFY)
				retval = -EAGAIN;
			else
				retval = -ERESTARTSYS;	
#else
			retval = -EAGAIN;
#endif
			break;
		}
		if (!(info->flags & ASYNC_CLOSING) &&
		    (do_clocal || (mcfrs_getsignals(info) & TIOCM_CD)))
			break;
		if (signal_pending(current)) {
			retval = -ERESTARTSYS;
			break;
		}
#ifdef SERIAL_DEBUG_OPEN
		printk("block_til_ready blocking: ttyS%d, count = %d\n",
		       info->line, info->count);
#endif
		schedule();
	}
	current->state = TASK_RUNNING;
	remove_wait_queue(&info->open_wait, &wait);
	if (!tty_hung_up_p(filp))
		info->count++;
	info->blocked_open--;
#ifdef SERIAL_DEBUG_OPEN
	printk("block_til_ready after blocking: ttyS%d, count = %d\n",
	       info->line, info->count);
#endif
	if (retval)
		return retval;
	info->flags |= ASYNC_NORMAL_ACTIVE;
	return 0;
}	

/*
 * This routine is called whenever a serial port is opened. It
 * enables interrupts for a serial port, linking in its structure into
 * the IRQ chain.   It also performs the serial-specific
 * initialization for the tty structure.
 */
int mcfrs_open(struct tty_struct *tty, struct file * filp)
{
	struct mcf_serial	*info;
	int 			retval, line;

	line = tty->index;
	if ((line < 0) || (line >= NR_PORTS))
		return -ENODEV;
	info = mcfrs_table + line;
	if (serial_paranoia_check(info, tty->name, "mcfrs_open"))
		return -ENODEV;
#ifdef SERIAL_DEBUG_OPEN
	printk("mcfrs_open %s, count = %d\n", tty->name, info->count);
#endif
	info->count++;
	tty->driver_data = info;
	info->tty = tty;

	/*
	 * Start up serial port
	 */
	retval = startup(info);
	if (retval)
		return retval;

	retval = block_til_ready(tty, filp, info);
	if (retval) {
#ifdef SERIAL_DEBUG_OPEN
		printk("mcfrs_open returning after block_til_ready with %d\n",
		       retval);
#endif
		return retval;
	}

#ifdef SERIAL_DEBUG_OPEN
	printk("mcfrs_open %s successful...\n", tty->name);
#endif
	return 0;
}

/*
 *	Based on the line number set up the internal interrupt stuff.
 */
static void mcfrs_irqinit(struct mcf_serial *info)
{
#if defined(CONFIG_M5272)
	volatile unsigned long	*icrp;
	volatile unsigned long	*portp;
	volatile unsigned char	*uartp;

	uartp = info->addr;
	icrp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_ICR2);

	switch (info->line) {
	case 0:
		*icrp = 0xe0000000;
		break;
	case 1:
		*icrp = 0x0e000000;
		break;
	default:
		printk("MCFRS: don't know how to handle UART %d interrupt?\n",
			info->line);
		return;
	}

	/* Enable the output lines for the serial ports */
	portp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_PBCNT);
	*portp = (*portp & ~0x000000ff) | 0x00000055;
	portp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_PDCNT);
	*portp = (*portp & ~0x000003fc) | 0x000002a8;
#elif defined(CONFIG_M523x) || defined(CONFIG_M527x) || defined(CONFIG_M528x)
	volatile unsigned char *icrp, *uartp;
	volatile unsigned long *imrp;

	uartp = info->addr;

	icrp = (volatile unsigned char *) (MCF_MBAR + MCFICM_INTC0 +
		MCFINTC_ICR0 + MCFINT_UART0 + info->line);
	*icrp = 0x30 + info->line; /* level 6, line based priority */

	imrp = (volatile unsigned long *) (MCF_MBAR + MCFICM_INTC0 +
		MCFINTC_IMRL);
	*imrp &= ~((1 << (info->irq - MCFINT_VECBASE)) | 1);
#if defined(CONFIG_M527x)
	{
		/*
		 * External Pin Mask Setting & Enable External Pin for Interface
		 * mrcbis@aliceposta.it
        	 */
		unsigned short *serpin_enable_mask;
		serpin_enable_mask = (MCF_IPSBAR + MCF_GPIO_PAR_UART);
		if (info->line == 0)
			*serpin_enable_mask |= UART0_ENABLE_MASK;
		else if (info->line == 1)
			*serpin_enable_mask |= UART1_ENABLE_MASK;
		else if (info->line == 2)
			*serpin_enable_mask |= UART2_ENABLE_MASK;
	}
#endif
#elif defined(CONFIG_M520x)
	volatile unsigned char *icrp, *uartp;
	volatile unsigned long *imrp;

	uartp = info->addr;

	icrp = (volatile unsigned char *) (MCF_MBAR + MCFICM_INTC0 +
		MCFINTC_ICR0 + MCFINT_UART0 + info->line);
	*icrp = 0x03;

	imrp = (volatile unsigned long *) (MCF_MBAR + MCFICM_INTC0 +
		MCFINTC_IMRL);
	*imrp &= ~((1 << (info->irq - MCFINT_VECBASE)) | 1);
	if (info->line < 2) {
		unsigned short *uart_par;
		uart_par = (unsigned short *)(MCF_IPSBAR + MCF_GPIO_PAR_UART);
		if (info->line == 0)
			*uart_par |=  MCF_GPIO_PAR_UART_PAR_UTXD0
				  | MCF_GPIO_PAR_UART_PAR_URXD0;
		else if (info->line == 1)
			*uart_par |=  MCF_GPIO_PAR_UART_PAR_UTXD1
				  | MCF_GPIO_PAR_UART_PAR_URXD1;
		} else if (info->line == 2) {
			unsigned char *feci2c_par;
			feci2c_par = (unsigned char *)(MCF_IPSBAR +  MCF_GPIO_PAR_FECI2C);
			*feci2c_par &= ~0x0F;
			*feci2c_par |=  MCF_GPIO_PAR_FECI2C_PAR_SCL_UTXD2
				    | MCF_GPIO_PAR_FECI2C_PAR_SDA_URXD2;
		}
#elif defined(CONFIG_M532x)
	volatile unsigned char *uartp;
	uartp = info->addr;
	switch (info->line) {
	case 0:
		MCF_INTC0_ICR26 = 0x3;
		MCF_INTC0_CIMR = 26;
		/* GPIO initialization */
		MCF_GPIO_PAR_UART |= 0x000F;
		break;
	case 1:
		MCF_INTC0_ICR27 = 0x3;
		MCF_INTC0_CIMR = 27;
		/* GPIO initialization */
		MCF_GPIO_PAR_UART |= 0x0FF0;
		break;
	case 2:
		MCF_INTC0_ICR28 = 0x3;
		MCF_INTC0_CIMR = 28;
		/* GPIOs also must be initalized, depends on board */
		break;
	}
#else
	volatile unsigned char	*icrp, *uartp;

	switch (info->line) {
	case 0:
		icrp = (volatile unsigned char *) (MCF_MBAR + MCFSIM_UART1ICR);
		*icrp = /*MCFSIM_ICR_AUTOVEC |*/ MCFSIM_ICR_LEVEL6 |
			MCFSIM_ICR_PRI1;
		mcf_setimr(mcf_getimr() & ~MCFSIM_IMR_UART1);
		break;
	case 1:
		icrp = (volatile unsigned char *) (MCF_MBAR + MCFSIM_UART2ICR);
		*icrp = /*MCFSIM_ICR_AUTOVEC |*/ MCFSIM_ICR_LEVEL6 |
			MCFSIM_ICR_PRI2;
		mcf_setimr(mcf_getimr() & ~MCFSIM_IMR_UART2);
		break;
	default:
		printk("MCFRS: don't know how to handle UART %d interrupt?\n",
			info->line);
		return;
	}

	uartp = info->addr;
	uartp[MCFUART_UIVR] = info->irq;
#endif

	/* Clear mask, so no surprise interrupts. */
	uartp[MCFUART_UIMR] = 0;

	if (request_irq(info->irq, mcfrs_interrupt, IRQF_DISABLED,
	    "ColdFire UART", NULL)) {
		printk("MCFRS: Unable to attach ColdFire UART %d interrupt "
			"vector=%d\n", info->line, info->irq);
	}

	return;
}


char *mcfrs_drivername = "ColdFire internal UART serial driver version 1.00\n";


/*
 * Serial stats reporting...
 */
int mcfrs_readproc(char *page, char **start, off_t off, int count,
		         int *eof, void *data)
{
	struct mcf_serial	*info;
	char			str[20];
	int			len, sigs, i;

	len = sprintf(page, mcfrs_drivername);
	for (i = 0; (i < NR_PORTS); i++) {
		info = &mcfrs_table[i];
		len += sprintf((page + len), "%d: port:%x irq=%d baud:%d ",
			i, (unsigned int) info->addr, info->irq, info->baud);
		if (info->stats.rx || info->stats.tx)
			len += sprintf((page + len), "tx:%d rx:%d ",
			info->stats.tx, info->stats.rx);
		if (info->stats.rxframing)
			len += sprintf((page + len), "fe:%d ",
			info->stats.rxframing);
		if (info->stats.rxparity)
			len += sprintf((page + len), "pe:%d ",
			info->stats.rxparity);
		if (info->stats.rxbreak)
			len += sprintf((page + len), "brk:%d ",
			info->stats.rxbreak);
		if (info->stats.rxoverrun)
			len += sprintf((page + len), "oe:%d ",
			info->stats.rxoverrun);

		str[0] = str[1] = 0;
		if ((sigs = mcfrs_getsignals(info))) {
			if (sigs & TIOCM_RTS)
				strcat(str, "|RTS");
			if (sigs & TIOCM_CTS)
				strcat(str, "|CTS");
			if (sigs & TIOCM_DTR)
				strcat(str, "|DTR");
			if (sigs & TIOCM_CD)
				strcat(str, "|CD");
		}

		len += sprintf((page + len), "%s\n", &str[1]);
	}

	return(len);
}


/* Finally, routines used to initialize the serial driver. */

static void show_serial_version(void)
{
	printk(mcfrs_drivername);
}

static const struct tty_operations mcfrs_ops = {
	.open = mcfrs_open,
	.close = mcfrs_close,
	.write = mcfrs_write,
	.flush_chars = mcfrs_flush_chars,
	.write_room = mcfrs_write_room,
	.chars_in_buffer = mcfrs_chars_in_buffer,
	.flush_buffer = mcfrs_flush_buffer,
	.ioctl = mcfrs_ioctl,
	.throttle = mcfrs_throttle,
	.unthrottle = mcfrs_unthrottle,
	.set_termios = mcfrs_set_termios,
	.stop = mcfrs_stop,
	.start = mcfrs_start,
	.hangup = mcfrs_hangup,
	.read_proc = mcfrs_readproc,
	.wait_until_sent = mcfrs_wait_until_sent,
 	.tiocmget = mcfrs_tiocmget,
	.tiocmset = mcfrs_tiocmset,
};

/* mcfrs_init inits the driver */
static int __init
mcfrs_init(void)
{
	struct mcf_serial	*info;
	unsigned long		flags;
	int			i;

	/* Setup base handler, and timer table. */
#ifdef MCFPP_DCD0
	init_timer(&mcfrs_timer_struct);
	mcfrs_timer_struct.function = mcfrs_timer;
	mcfrs_timer_struct.data = 0;
	mcfrs_timer_struct.expires = jiffies + HZ/25;
	add_timer(&mcfrs_timer_struct);
	mcfrs_ppstatus = mcf_getppdata() & (MCFPP_DCD0 | MCFPP_DCD1);
#endif
	mcfrs_serial_driver = alloc_tty_driver(NR_PORTS);
	if (!mcfrs_serial_driver)
		return -ENOMEM;

	show_serial_version();

	/* Initialize the tty_driver structure */
	mcfrs_serial_driver->owner = THIS_MODULE;
	mcfrs_serial_driver->name = "ttyS";
	mcfrs_serial_driver->driver_name = "mcfserial";
	mcfrs_serial_driver->major = TTY_MAJOR;
	mcfrs_serial_driver->minor_start = 64;
	mcfrs_serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
	mcfrs_serial_driver->subtype = SERIAL_TYPE_NORMAL;
	mcfrs_serial_driver->init_termios = tty_std_termios;

	mcfrs_serial_driver->init_termios.c_cflag =
		mcfrs_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
	mcfrs_serial_driver->flags = TTY_DRIVER_REAL_RAW;

	tty_set_operations(mcfrs_serial_driver, &mcfrs_ops);

	if (tty_register_driver(mcfrs_serial_driver)) {
		printk("MCFRS: Couldn't register serial driver\n");
		put_tty_driver(mcfrs_serial_driver);
		return(-EBUSY);
	}

	local_irq_save(flags);

	/*
	 *	Configure all the attached serial ports.
	 */
	for (i = 0, info = mcfrs_table; (i < NR_PORTS); i++, info++) {
		info->magic = SERIAL_MAGIC;
		info->line = i;
		info->tty = 0;
		info->custom_divisor = 16;
		info->close_delay = 50;
		info->closing_wait = 3000;
		info->x_char = 0;
		info->event = 0;
		info->count = 0;
		info->blocked_open = 0;
		INIT_WORK(&info->tqueue, mcfrs_offintr, info);
		INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info);
		init_waitqueue_head(&info->open_wait);
		init_waitqueue_head(&info->close_wait);

		info->imr = 0;
		mcfrs_setsignals(info, 0, 0);
		mcfrs_irqinit(info);

		printk("ttyS%d at 0x%04x (irq = %d)", info->line,
			(unsigned int) info->addr, info->irq);
		printk(" is a builtin ColdFire UART\n");
	}

	local_irq_restore(flags);
	return 0;
}

module_init(mcfrs_init);

/****************************************************************************/
/*                          Serial Console                                  */
/****************************************************************************/

/*
 *	Quick and dirty UART initialization, for console output.
 */

void mcfrs_init_console(void)
{
	volatile unsigned char	*uartp;
	unsigned int		clk;

	/*
	 *	Reset UART, get it into known state...
	 */
	uartp = (volatile unsigned char *) (MCF_MBAR +
		(mcfrs_console_port ? MCFUART_BASE2 : MCFUART_BASE1));

	uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX;  /* reset RX */
	uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX;  /* reset TX */
	uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETMRPTR;  /* reset MR pointer */

	/*
	 * Set port for defined baud , 8 data bits, 1 stop bit, no parity.
	 */
	uartp[MCFUART_UMR] = MCFUART_MR1_PARITYNONE | MCFUART_MR1_CS8;
	uartp[MCFUART_UMR] = MCFUART_MR2_STOP1;

#ifdef	CONFIG_M5272
{
	/*
	 * For the MCF5272, also compute the baudrate fraction.
	 */
	int fraction = MCF_BUSCLK - (clk * 32 * mcfrs_console_baud);
	fraction *= 16;
	fraction /= (32 * mcfrs_console_baud);
	uartp[MCFUART_UFPD] = (fraction & 0xf);		/* set fraction */
	clk = (MCF_BUSCLK / mcfrs_console_baud) / 32;
}
#else
	clk = ((MCF_BUSCLK / mcfrs_console_baud) + 16) / 32; /* set baud */
#endif

	uartp[MCFUART_UBG1] = (clk & 0xff00) >> 8;  /* set msb baud */
	uartp[MCFUART_UBG2] = (clk & 0xff);  /* set lsb baud */
	uartp[MCFUART_UCSR] = MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER;
	uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE;

	mcfrs_console_inited++;
	return;
}


/*
 *	Setup for console. Argument comes from the boot command line.
 */

int mcfrs_console_setup(struct console *cp, char *arg)
{
	int		i, n = CONSOLE_BAUD_RATE;

	if (!cp)
		return(-1);

	if (!strncmp(cp->name, "ttyS", 4))
		mcfrs_console_port = cp->index;
	else if (!strncmp(cp->name, "cua", 3))
		mcfrs_console_port = cp->index;
	else
		return(-1);

	if (arg)
		n = simple_strtoul(arg,NULL,0);
	for (i = 0; i < MCFRS_BAUD_TABLE_SIZE; i++)
		if (mcfrs_baud_table[i] == n)
			break;
	if (i < MCFRS_BAUD_TABLE_SIZE) {
		mcfrs_console_baud = n;
		mcfrs_console_cbaud = 0;
		if (i > 15) {
			mcfrs_console_cbaud |= CBAUDEX;
			i -= 15;
		}
		mcfrs_console_cbaud |= i;
	}
	mcfrs_init_console(); /* make sure baud rate changes */
	return(0);
}


static struct tty_driver *mcfrs_console_device(struct console *c, int *index)
{
	*index = c->index;
	return mcfrs_serial_driver;
}


/*
 *	Output a single character, using UART polled mode.
 *	This is used for console output.
 */

void mcfrs_put_char(char ch)
{
	volatile unsigned char	*uartp;
	unsigned long		flags;
	int			i;

	uartp = (volatile unsigned char *) (MCF_MBAR +
		(mcfrs_console_port ? MCFUART_BASE2 : MCFUART_BASE1));

	local_irq_save(flags);
	for (i = 0; (i < 0x10000); i++) {
		if (uartp[MCFUART_USR] & MCFUART_USR_TXREADY)
			break;
	}
	if (i < 0x10000) {
		uartp[MCFUART_UTB] = ch;
		for (i = 0; (i < 0x10000); i++)
			if (uartp[MCFUART_USR] & MCFUART_USR_TXEMPTY)
				break;
	}
	if (i >= 0x10000)
		mcfrs_init_console(); /* try and get it back */
	local_irq_restore(flags);

	return;
}


/*
 * rs_console_write is registered for printk output.
 */

void mcfrs_console_write(struct console *cp, const char *p, unsigned len)
{
	if (!mcfrs_console_inited)
		mcfrs_init_console();
	while (len-- > 0) {
		if (*p == '\n')
			mcfrs_put_char('\r');
		mcfrs_put_char(*p++);
	}
}

/*
 * declare our consoles
 */

struct console mcfrs_console = {
	.name		= "ttyS",
	.write		= mcfrs_console_write,
	.device		= mcfrs_console_device,
	.setup		= mcfrs_console_setup,
	.flags		= CON_PRINTBUFFER,
	.index		= -1,
};

static int __init mcfrs_console_init(void)
{
	register_console(&mcfrs_console);
	return 0;
}

console_initcall(mcfrs_console_init);

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