aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/serial/mpc52xx_uart.c
blob: d93b3578c5e22f67fdb48b074478c042b81e31bf (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
/*
 * Driver for the PSC of the Freescale MPC52xx PSCs configured as UARTs.
 *
 * FIXME According to the usermanual the status bits in the status register
 * are only updated when the peripherals access the FIFO and not when the
 * CPU access them. So since we use this bits to know when we stop writing
 * and reading, they may not be updated in-time and a race condition may
 * exists. But I haven't be able to prove this and I don't care. But if
 * any problem arises, it might worth checking. The TX/RX FIFO Stats
 * registers should be used in addition.
 * Update: Actually, they seem updated ... At least the bits we use.
 *
 *
 * Maintainer : Sylvain Munaut <tnt@246tNt.com>
 *
 * Some of the code has been inspired/copied from the 2.4 code written
 * by Dale Farnsworth <dfarnsworth@mvista.com>.
 *
 * Copyright (C) 2008 Freescale Semiconductor Inc.
 *                    John Rigby <jrigby@gmail.com>
 * Added support for MPC5121
 * Copyright (C) 2006 Secret Lab Technologies Ltd.
 *                    Grant Likely <grant.likely@secretlab.ca>
 * Copyright (C) 2004-2006 Sylvain Munaut <tnt@246tNt.com>
 * Copyright (C) 2003 MontaVista, Software, Inc.
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */

/* Platform device Usage :
 *
 * Since PSCs can have multiple function, the correct driver for each one
 * is selected by calling mpc52xx_match_psc_function(...). The function
 * handled by this driver is "uart".
 *
 * The driver init all necessary registers to place the PSC in uart mode without
 * DCD. However, the pin multiplexing aren't changed and should be set either
 * by the bootloader or in the platform init code.
 *
 * The idx field must be equal to the PSC index (e.g. 0 for PSC1, 1 for PSC2,
 * and so on). So the PSC1 is mapped to /dev/ttyPSC0, PSC2 to /dev/ttyPSC1 and
 * so on. But be warned, it's an ABSOLUTE REQUIREMENT ! This is needed mainly
 * fpr the console code : without this 1:1 mapping, at early boot time, when we
 * are parsing the kernel args console=ttyPSC?, we wouldn't know which PSC it
 * will be mapped to.
 */

/* OF Platform device Usage :
 *
 * This driver is only used for PSCs configured in uart mode.  The device
 * tree will have a node for each PSC in uart mode w/ device_type = "serial"
 * and "mpc52xx-psc-uart" in the compatible string
 *
 * By default, PSC devices are enumerated in the order they are found.  However
 * a particular PSC number can be forces by adding 'device_no = <port#>'
 * to the device node.
 *
 * The driver init all necessary registers to place the PSC in uart mode without
 * DCD. However, the pin multiplexing aren't changed and should be set either
 * by the bootloader or in the platform init code.
 */

#undef DEBUG

#include <linux/device.h>
#include <linux/module.h>
#include <linux/tty.h>
#include <linux/serial.h>
#include <linux/sysrq.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/io.h>

#if defined(CONFIG_PPC_MERGE)
#include <linux/of.h>
#include <linux/of_platform.h>
#else
#include <linux/platform_device.h>
#endif

#include <asm/mpc52xx.h>
#include <asm/mpc512x.h>
#include <asm/mpc52xx_psc.h>

#if defined(CONFIG_SERIAL_MPC52xx_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif

#include <linux/serial_core.h>


/* We've been assigned a range on the "Low-density serial ports" major */
#define SERIAL_PSC_MAJOR	204
#define SERIAL_PSC_MINOR	148


#define ISR_PASS_LIMIT 256	/* Max number of iteration in the interrupt */


static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM];
	/* Rem: - We use the read_status_mask as a shadow of
	 *        psc->mpc52xx_psc_imr
	 *      - It's important that is array is all zero on start as we
	 *        use it to know if it's initialized or not ! If it's not sure
	 *        it's cleared, then a memset(...,0,...) should be added to
	 *        the console_init
	 */
#if defined(CONFIG_PPC_MERGE)
/* lookup table for matching device nodes to index numbers */
static struct device_node *mpc52xx_uart_nodes[MPC52xx_PSC_MAXNUM];

static void mpc52xx_uart_of_enumerate(void);
#endif


#define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase))


/* Forward declaration of the interruption handling routine */
static irqreturn_t mpc52xx_uart_int(int irq, void *dev_id);


/* Simple macro to test if a port is console or not. This one is taken
 * for serial_core.c and maybe should be moved to serial_core.h ? */
#ifdef CONFIG_SERIAL_CORE_CONSOLE
#define uart_console(port) \
	((port)->cons && (port)->cons->index == (port)->line)
#else
#define uart_console(port)	(0)
#endif

/* ======================================================================== */
/* PSC fifo operations for isolating differences between 52xx and 512x      */
/* ======================================================================== */

struct psc_ops {
	void		(*fifo_init)(struct uart_port *port);
	int		(*raw_rx_rdy)(struct uart_port *port);
	int		(*raw_tx_rdy)(struct uart_port *port);
	int		(*rx_rdy)(struct uart_port *port);
	int		(*tx_rdy)(struct uart_port *port);
	int		(*tx_empty)(struct uart_port *port);
	void		(*stop_rx)(struct uart_port *port);
	void		(*start_tx)(struct uart_port *port);
	void		(*stop_tx)(struct uart_port *port);
	void		(*rx_clr_irq)(struct uart_port *port);
	void		(*tx_clr_irq)(struct uart_port *port);
	void		(*write_char)(struct uart_port *port, unsigned char c);
	unsigned char	(*read_char)(struct uart_port *port);
	void		(*cw_disable_ints)(struct uart_port *port);
	void		(*cw_restore_ints)(struct uart_port *port);
	unsigned long	(*getuartclk)(void *p);
};

#ifdef CONFIG_PPC_MPC52xx
#define FIFO_52xx(port) ((struct mpc52xx_psc_fifo __iomem *)(PSC(port)+1))
static void mpc52xx_psc_fifo_init(struct uart_port *port)
{
	struct mpc52xx_psc __iomem *psc = PSC(port);
	struct mpc52xx_psc_fifo __iomem *fifo = FIFO_52xx(port);

	/* /32 prescaler */
	out_be16(&psc->mpc52xx_psc_clock_select, 0xdd00);

	out_8(&fifo->rfcntl, 0x00);
	out_be16(&fifo->rfalarm, 0x1ff);
	out_8(&fifo->tfcntl, 0x07);
	out_be16(&fifo->tfalarm, 0x80);

	port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY;
	out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
}

static int mpc52xx_psc_raw_rx_rdy(struct uart_port *port)
{
	return in_be16(&PSC(port)->mpc52xx_psc_status)
	    & MPC52xx_PSC_SR_RXRDY;
}

static int mpc52xx_psc_raw_tx_rdy(struct uart_port *port)
{
	return in_be16(&PSC(port)->mpc52xx_psc_status)
	    & MPC52xx_PSC_SR_TXRDY;
}


static int mpc52xx_psc_rx_rdy(struct uart_port *port)
{
	return in_be16(&PSC(port)->mpc52xx_psc_isr)
	    & port->read_status_mask
	    & MPC52xx_PSC_IMR_RXRDY;
}

static int mpc52xx_psc_tx_rdy(struct uart_port *port)
{
	return in_be16(&PSC(port)->mpc52xx_psc_isr)
	    & port->read_status_mask
	    & MPC52xx_PSC_IMR_TXRDY;
}

static int mpc52xx_psc_tx_empty(struct uart_port *port)
{
	return in_be16(&PSC(port)->mpc52xx_psc_status)
	    & MPC52xx_PSC_SR_TXEMP;
}

static void mpc52xx_psc_start_tx(struct uart_port *port)
{
	port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY;
	out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
}

static void mpc52xx_psc_stop_tx(struct uart_port *port)
{
	port->read_status_mask &= ~MPC52xx_PSC_IMR_TXRDY;
	out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
}

static void mpc52xx_psc_stop_rx(struct uart_port *port)
{
	port->read_status_mask &= ~MPC52xx_PSC_IMR_RXRDY;
	out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
}

static void mpc52xx_psc_rx_clr_irq(struct uart_port *port)
{
}

static void mpc52xx_psc_tx_clr_irq(struct uart_port *port)
{
}

static void mpc52xx_psc_write_char(struct uart_port *port, unsigned char c)
{
	out_8(&PSC(port)->mpc52xx_psc_buffer_8, c);
}

static unsigned char mpc52xx_psc_read_char(struct uart_port *port)
{
	return in_8(&PSC(port)->mpc52xx_psc_buffer_8);
}

static void mpc52xx_psc_cw_disable_ints(struct uart_port *port)
{
	out_be16(&PSC(port)->mpc52xx_psc_imr, 0);
}

static void mpc52xx_psc_cw_restore_ints(struct uart_port *port)
{
	out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask);
}

/* Search for bus-frequency property in this node or a parent */
static unsigned long mpc52xx_getuartclk(void *p)
{
#if defined(CONFIG_PPC_MERGE)
	/*
	 * 5200 UARTs have a / 32 prescaler
	 * but the generic serial code assumes 16
	 * so return ipb freq / 2
	 */
	return mpc52xx_find_ipb_freq(p) / 2;
#else
	pr_debug("unexpected call to mpc52xx_getuartclk with arch/ppc\n");
	return NULL;
#endif
}

static struct psc_ops mpc52xx_psc_ops = {
	.fifo_init = mpc52xx_psc_fifo_init,
	.raw_rx_rdy = mpc52xx_psc_raw_rx_rdy,
	.raw_tx_rdy = mpc52xx_psc_raw_tx_rdy,
	.rx_rdy = mpc52xx_psc_rx_rdy,
	.tx_rdy = mpc52xx_psc_tx_rdy,
	.tx_empty = mpc52xx_psc_tx_empty,
	.stop_rx = mpc52xx_psc_stop_rx,
	.start_tx = mpc52xx_psc_start_tx,
	.stop_tx = mpc52xx_psc_stop_tx,
	.rx_clr_irq = mpc52xx_psc_rx_clr_irq,
	.tx_clr_irq = mpc52xx_psc_tx_clr_irq,
	.write_char = mpc52xx_psc_write_char,
	.read_char = mpc52xx_psc_read_char,
	.cw_disable_ints = mpc52xx_psc_cw_disable_ints,
	.cw_restore_ints = mpc52xx_psc_cw_restore_ints,
	.getuartclk = mpc52xx_getuartclk,
};

#endif /* CONFIG_MPC52xx */

#ifdef CONFIG_PPC_MPC512x
#define FIFO_512x(port) ((struct mpc512x_psc_fifo __iomem *)(PSC(port)+1))
static void mpc512x_psc_fifo_init(struct uart_port *port)
{
	out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_RESET_SLICE);
	out_be32(&FIFO_512x(port)->txcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
	out_be32(&FIFO_512x(port)->txalarm, 1);
	out_be32(&FIFO_512x(port)->tximr, 0);

	out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_RESET_SLICE);
	out_be32(&FIFO_512x(port)->rxcmd, MPC512x_PSC_FIFO_ENABLE_SLICE);
	out_be32(&FIFO_512x(port)->rxalarm, 1);
	out_be32(&FIFO_512x(port)->rximr, 0);

	out_be32(&FIFO_512x(port)->tximr, MPC512x_PSC_FIFO_ALARM);
	out_be32(&FIFO_512x(port)->rximr, MPC512x_PSC_FIFO_ALARM);
}

static int mpc512x_psc_raw_rx_rdy(struct uart_port *port)
{
	return !(in_be32(&FIFO_512x(port)->rxsr) & MPC512x_PSC_FIFO_EMPTY);
}

static int mpc512x_psc_raw_tx_rdy(struct uart_port *port)
{
	return !(in_be32(&FIFO_512x(port)->txsr) & MPC512x_PSC_FIFO_FULL);
}

static int mpc512x_psc_rx_rdy(struct uart_port *port)
{
	return in_be32(&FIFO_512x(port)->rxsr)
	    & in_be32(&FIFO_512x(port)->rximr)
	    & MPC512x_PSC_FIFO_ALARM;
}

static int mpc512x_psc_tx_rdy(struct uart_port *port)
{
	return in_be32(&FIFO_512x(port)->txsr)
	    & in_be32(&FIFO_512x(port)->tximr)
	    & MPC512x_PSC_FIFO_ALARM;
}

static int mpc512x_psc_tx_empty(struct uart_port *port)
{
	return in_be32(&FIFO_512x(port)->txsr)
	    & MPC512x_PSC_FIFO_EMPTY;
}

static void mpc512x_psc_stop_rx(struct uart_port *port)
{
	unsigned long rx_fifo_imr;

	rx_fifo_imr = in_be32(&FIFO_512x(port)->rximr);
	rx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
	out_be32(&FIFO_512x(port)->rximr, rx_fifo_imr);
}

static void mpc512x_psc_start_tx(struct uart_port *port)
{
	unsigned long tx_fifo_imr;

	tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
	tx_fifo_imr |= MPC512x_PSC_FIFO_ALARM;
	out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
}

static void mpc512x_psc_stop_tx(struct uart_port *port)
{
	unsigned long tx_fifo_imr;

	tx_fifo_imr = in_be32(&FIFO_512x(port)->tximr);
	tx_fifo_imr &= ~MPC512x_PSC_FIFO_ALARM;
	out_be32(&FIFO_512x(port)->tximr, tx_fifo_imr);
}

static void mpc512x_psc_rx_clr_irq(struct uart_port *port)
{
	out_be32(&FIFO_512x(port)->rxisr, in_be32(&FIFO_512x(port)->rxisr));
}

static void mpc512x_psc_tx_clr_irq(struct uart_port *port)
{
	out_be32(&FIFO_512x(port)->txisr, in_be32(&FIFO_512x(port)->txisr));
}

static void mpc512x_psc_write_char(struct uart_port *port, unsigned char c)
{
	out_8(&FIFO_512x(port)->txdata_8, c);
}

static unsigned char mpc512x_psc_read_char(struct uart_port *port)
{
	return in_8(&FIFO_512x(port)->rxdata_8);
}

static void mpc512x_psc_cw_disable_ints(struct uart_port *port)
{
	port->read_status_mask =
		in_be32(&FIFO_512x(port)->tximr) << 16 |
		in_be32(&FIFO_512x(port)->rximr);
	out_be32(&FIFO_512x(port)->tximr, 0);
	out_be32(&FIFO_512x(port)->rximr, 0);
}

static void mpc512x_psc_cw_restore_ints(struct uart_port *port)
{
	out_be32(&FIFO_512x(port)->tximr,
		(port->read_status_mask >> 16) & 0x7f);
	out_be32(&FIFO_512x(port)->rximr, port->read_status_mask & 0x7f);
}

static unsigned long mpc512x_getuartclk(void *p)
{
	return mpc512x_find_ips_freq(p);
}

static struct psc_ops mpc512x_psc_ops = {
	.fifo_init = mpc512x_psc_fifo_init,
	.raw_rx_rdy = mpc512x_psc_raw_rx_rdy,
	.raw_tx_rdy = mpc512x_psc_raw_tx_rdy,
	.rx_rdy = mpc512x_psc_rx_rdy,
	.tx_rdy = mpc512x_psc_tx_rdy,
	.tx_empty = mpc512x_psc_tx_empty,
	.stop_rx = mpc512x_psc_stop_rx,
	.start_tx = mpc512x_psc_start_tx,
	.stop_tx = mpc512x_psc_stop_tx,
	.rx_clr_irq = mpc512x_psc_rx_clr_irq,
	.tx_clr_irq = mpc512x_psc_tx_clr_irq,
	.write_char = mpc512x_psc_write_char,
	.read_char = mpc512x_psc_read_char,
	.cw_disable_ints = mpc512x_psc_cw_disable_ints,
	.cw_restore_ints = mpc512x_psc_cw_restore_ints,
	.getuartclk = mpc512x_getuartclk,
};
#endif

static struct psc_ops *psc_ops;

/* ======================================================================== */
/* UART operations                                                          */
/* ======================================================================== */

static unsigned int
mpc52xx_uart_tx_empty(struct uart_port *port)
{
	return psc_ops->tx_empty(port) ? TIOCSER_TEMT : 0;
}

static void
mpc52xx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
	/* Not implemented */
}

static unsigned int
mpc52xx_uart_get_mctrl(struct uart_port *port)
{
	/* Not implemented */
	return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
}

static void
mpc52xx_uart_stop_tx(struct uart_port *port)
{
	/* port->lock taken by caller */
	psc_ops->stop_tx(port);
}

static void
mpc52xx_uart_start_tx(struct uart_port *port)
{
	/* port->lock taken by caller */
	psc_ops->start_tx(port);
}

static void
mpc52xx_uart_send_xchar(struct uart_port *port, char ch)
{
	unsigned long flags;
	spin_lock_irqsave(&port->lock, flags);

	port->x_char = ch;
	if (ch) {
		/* Make sure tx interrupts are on */
		/* Truly necessary ??? They should be anyway */
		psc_ops->start_tx(port);
	}

	spin_unlock_irqrestore(&port->lock, flags);
}

static void
mpc52xx_uart_stop_rx(struct uart_port *port)
{
	/* port->lock taken by caller */
	psc_ops->stop_rx(port);
}

static void
mpc52xx_uart_enable_ms(struct uart_port *port)
{
	/* Not implemented */
}

static void
mpc52xx_uart_break_ctl(struct uart_port *port, int ctl)
{
	unsigned long flags;
	spin_lock_irqsave(&port->lock, flags);

	if (ctl == -1)
		out_8(&PSC(port)->command, MPC52xx_PSC_START_BRK);
	else
		out_8(&PSC(port)->command, MPC52xx_PSC_STOP_BRK);

	spin_unlock_irqrestore(&port->lock, flags);
}

static int
mpc52xx_uart_startup(struct uart_port *port)
{
	struct mpc52xx_psc __iomem *psc = PSC(port);
	int ret;

	/* Request IRQ */
	ret = request_irq(port->irq, mpc52xx_uart_int,
		IRQF_DISABLED | IRQF_SAMPLE_RANDOM | IRQF_SHARED,
		"mpc52xx_psc_uart", port);
	if (ret)
		return ret;

	/* Reset/activate the port, clear and enable interrupts */
	out_8(&psc->command, MPC52xx_PSC_RST_RX);
	out_8(&psc->command, MPC52xx_PSC_RST_TX);

	out_be32(&psc->sicr, 0);	/* UART mode DCD ignored */

	psc_ops->fifo_init(port);

	out_8(&psc->command, MPC52xx_PSC_TX_ENABLE);
	out_8(&psc->command, MPC52xx_PSC_RX_ENABLE);

	return 0;
}

static void
mpc52xx_uart_shutdown(struct uart_port *port)
{
	struct mpc52xx_psc __iomem *psc = PSC(port);

	/* Shut down the port.  Leave TX active if on a console port */
	out_8(&psc->command, MPC52xx_PSC_RST_RX);
	if (!uart_console(port))
		out_8(&psc->command, MPC52xx_PSC_RST_TX);

	port->read_status_mask = 0;
	out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);

	/* Release interrupt */
	free_irq(port->irq, port);
}

static void
mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new,
			 struct ktermios *old)
{
	struct mpc52xx_psc __iomem *psc = PSC(port);
	unsigned long flags;
	unsigned char mr1, mr2;
	unsigned short ctr;
	unsigned int j, baud, quot;

	/* Prepare what we're gonna write */
	mr1 = 0;

	switch (new->c_cflag & CSIZE) {
	case CS5:	mr1 |= MPC52xx_PSC_MODE_5_BITS;
		break;
	case CS6:	mr1 |= MPC52xx_PSC_MODE_6_BITS;
		break;
	case CS7:	mr1 |= MPC52xx_PSC_MODE_7_BITS;
		break;
	case CS8:
	default:	mr1 |= MPC52xx_PSC_MODE_8_BITS;
	}

	if (new->c_cflag & PARENB) {
		mr1 |= (new->c_cflag & PARODD) ?
			MPC52xx_PSC_MODE_PARODD : MPC52xx_PSC_MODE_PAREVEN;
	} else
		mr1 |= MPC52xx_PSC_MODE_PARNONE;


	mr2 = 0;

	if (new->c_cflag & CSTOPB)
		mr2 |= MPC52xx_PSC_MODE_TWO_STOP;
	else
		mr2 |= ((new->c_cflag & CSIZE) == CS5) ?
			MPC52xx_PSC_MODE_ONE_STOP_5_BITS :
			MPC52xx_PSC_MODE_ONE_STOP;


	baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16);
	quot = uart_get_divisor(port, baud);
	ctr = quot & 0xffff;

	/* Get the lock */
	spin_lock_irqsave(&port->lock, flags);

	/* Update the per-port timeout */
	uart_update_timeout(port, new->c_cflag, baud);

	/* Do our best to flush TX & RX, so we don't loose anything */
	/* But we don't wait indefinitly ! */
	j = 5000000;	/* Maximum wait */
	/* FIXME Can't receive chars since set_termios might be called at early
	 * boot for the console, all stuff is not yet ready to receive at that
	 * time and that just makes the kernel oops */
	/* while (j-- && mpc52xx_uart_int_rx_chars(port)); */
	while (!mpc52xx_uart_tx_empty(port) && --j)
		udelay(1);

	if (!j)
		printk(KERN_ERR "mpc52xx_uart.c: "
			"Unable to flush RX & TX fifos in-time in set_termios."
			"Some chars may have been lost.\n");

	/* Reset the TX & RX */
	out_8(&psc->command, MPC52xx_PSC_RST_RX);
	out_8(&psc->command, MPC52xx_PSC_RST_TX);

	/* Send new mode settings */
	out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
	out_8(&psc->mode, mr1);
	out_8(&psc->mode, mr2);
	out_8(&psc->ctur, ctr >> 8);
	out_8(&psc->ctlr, ctr & 0xff);

	/* Reenable TX & RX */
	out_8(&psc->command, MPC52xx_PSC_TX_ENABLE);
	out_8(&psc->command, MPC52xx_PSC_RX_ENABLE);

	/* We're all set, release the lock */
	spin_unlock_irqrestore(&port->lock, flags);
}

static const char *
mpc52xx_uart_type(struct uart_port *port)
{
	return port->type == PORT_MPC52xx ? "MPC52xx PSC" : NULL;
}

static void
mpc52xx_uart_release_port(struct uart_port *port)
{
	/* remapped by us ? */
	if (port->flags & UPF_IOREMAP) {
		iounmap(port->membase);
		port->membase = NULL;
	}

	release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
}

static int
mpc52xx_uart_request_port(struct uart_port *port)
{
	int err;

	if (port->flags & UPF_IOREMAP) /* Need to remap ? */
		port->membase = ioremap(port->mapbase,
					sizeof(struct mpc52xx_psc));

	if (!port->membase)
		return -EINVAL;

	err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc),
			"mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;

	if (err && (port->flags & UPF_IOREMAP)) {
		iounmap(port->membase);
		port->membase = NULL;
	}

	return err;
}

static void
mpc52xx_uart_config_port(struct uart_port *port, int flags)
{
	if ((flags & UART_CONFIG_TYPE)
		&& (mpc52xx_uart_request_port(port) == 0))
		port->type = PORT_MPC52xx;
}

static int
mpc52xx_uart_verify_port(struct uart_port *port, struct serial_struct *ser)
{
	if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPC52xx)
		return -EINVAL;

	if ((ser->irq != port->irq) ||
	    (ser->io_type != SERIAL_IO_MEM) ||
	    (ser->baud_base != port->uartclk)  ||
	    (ser->iomem_base != (void *)port->mapbase) ||
	    (ser->hub6 != 0))
		return -EINVAL;

	return 0;
}


static struct uart_ops mpc52xx_uart_ops = {
	.tx_empty	= mpc52xx_uart_tx_empty,
	.set_mctrl	= mpc52xx_uart_set_mctrl,
	.get_mctrl	= mpc52xx_uart_get_mctrl,
	.stop_tx	= mpc52xx_uart_stop_tx,
	.start_tx	= mpc52xx_uart_start_tx,
	.send_xchar	= mpc52xx_uart_send_xchar,
	.stop_rx	= mpc52xx_uart_stop_rx,
	.enable_ms	= mpc52xx_uart_enable_ms,
	.break_ctl	= mpc52xx_uart_break_ctl,
	.startup	= mpc52xx_uart_startup,
	.shutdown	= mpc52xx_uart_shutdown,
	.set_termios	= mpc52xx_uart_set_termios,
/*	.pm		= mpc52xx_uart_pm,		Not supported yet */
/*	.set_wake	= mpc52xx_uart_set_wake,	Not supported yet */
	.type		= mpc52xx_uart_type,
	.release_port	= mpc52xx_uart_release_port,
	.request_port	= mpc52xx_uart_request_port,
	.config_port	= mpc52xx_uart_config_port,
	.verify_port	= mpc52xx_uart_verify_port
};


/* ======================================================================== */
/* Interrupt handling                                                       */
/* ======================================================================== */

static inline int
mpc52xx_uart_int_rx_chars(struct uart_port *port)
{
	struct tty_struct *tty = port->info->tty;
	unsigned char ch, flag;
	unsigned short status;

	/* While we can read, do so ! */
	while (psc_ops->raw_rx_rdy(port)) {
		/* Get the char */
		ch = psc_ops->read_char(port);

		/* Handle sysreq char */
#ifdef SUPPORT_SYSRQ
		if (uart_handle_sysrq_char(port, ch)) {
			port->sysrq = 0;
			continue;
		}
#endif

		/* Store it */

		flag = TTY_NORMAL;
		port->icount.rx++;

		status = in_be16(&PSC(port)->mpc52xx_psc_status);

		if (status & (MPC52xx_PSC_SR_PE |
			      MPC52xx_PSC_SR_FE |
			      MPC52xx_PSC_SR_RB)) {

			if (status & MPC52xx_PSC_SR_RB) {
				flag = TTY_BREAK;
				uart_handle_break(port);
			} else if (status & MPC52xx_PSC_SR_PE)
				flag = TTY_PARITY;
			else if (status & MPC52xx_PSC_SR_FE)
				flag = TTY_FRAME;

			/* Clear error condition */
			out_8(&PSC(port)->command, MPC52xx_PSC_RST_ERR_STAT);

		}
		tty_insert_flip_char(tty, ch, flag);
		if (status & MPC52xx_PSC_SR_OE) {
			/*
			 * Overrun is special, since it's
			 * reported immediately, and doesn't
			 * affect the current character
			 */
			tty_insert_flip_char(tty, 0, TTY_OVERRUN);
		}
	}

	tty_flip_buffer_push(tty);

	return psc_ops->raw_rx_rdy(port);
}

static inline int
mpc52xx_uart_int_tx_chars(struct uart_port *port)
{
	struct circ_buf *xmit = &port->info->xmit;

	/* Process out of band chars */
	if (port->x_char) {
		psc_ops->write_char(port, port->x_char);
		port->icount.tx++;
		port->x_char = 0;
		return 1;
	}

	/* Nothing to do ? */
	if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
		mpc52xx_uart_stop_tx(port);
		return 0;
	}

	/* Send chars */
	while (psc_ops->raw_tx_rdy(port)) {
		psc_ops->write_char(port, xmit->buf[xmit->tail]);
		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
		port->icount.tx++;
		if (uart_circ_empty(xmit))
			break;
	}

	/* Wake up */
	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
		uart_write_wakeup(port);

	/* Maybe we're done after all */
	if (uart_circ_empty(xmit)) {
		mpc52xx_uart_stop_tx(port);
		return 0;
	}

	return 1;
}

static irqreturn_t
mpc52xx_uart_int(int irq, void *dev_id)
{
	struct uart_port *port = dev_id;
	unsigned long pass = ISR_PASS_LIMIT;
	unsigned int keepgoing;

	spin_lock(&port->lock);

	/* While we have stuff to do, we continue */
	do {
		/* If we don't find anything to do, we stop */
		keepgoing = 0;

		psc_ops->rx_clr_irq(port);
		if (psc_ops->rx_rdy(port))
			keepgoing |= mpc52xx_uart_int_rx_chars(port);

		psc_ops->tx_clr_irq(port);
		if (psc_ops->tx_rdy(port))
			keepgoing |= mpc52xx_uart_int_tx_chars(port);

		/* Limit number of iteration */
		if (!(--pass))
			keepgoing = 0;

	} while (keepgoing);

	spin_unlock(&port->lock);

	return IRQ_HANDLED;
}


/* ======================================================================== */
/* Console ( if applicable )                                                */
/* ======================================================================== */

#ifdef CONFIG_SERIAL_MPC52xx_CONSOLE

static void __init
mpc52xx_console_get_options(struct uart_port *port,
			    int *baud, int *parity, int *bits, int *flow)
{
	struct mpc52xx_psc __iomem *psc = PSC(port);
	unsigned char mr1;

	pr_debug("mpc52xx_console_get_options(port=%p)\n", port);

	/* Read the mode registers */
	out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
	mr1 = in_8(&psc->mode);

	/* CT{U,L}R are write-only ! */
	*baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
#if !defined(CONFIG_PPC_MERGE)
	if (__res.bi_baudrate)
		*baud = __res.bi_baudrate;
#endif

	/* Parse them */
	switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
	case MPC52xx_PSC_MODE_5_BITS:
		*bits = 5;
		break;
	case MPC52xx_PSC_MODE_6_BITS:
		*bits = 6;
		break;
	case MPC52xx_PSC_MODE_7_BITS:
		*bits = 7;
		break;
	case MPC52xx_PSC_MODE_8_BITS:
	default:
		*bits = 8;
	}

	if (mr1 & MPC52xx_PSC_MODE_PARNONE)
		*parity = 'n';
	else
		*parity = mr1 & MPC52xx_PSC_MODE_PARODD ? 'o' : 'e';
}

static void
mpc52xx_console_write(struct console *co, const char *s, unsigned int count)
{
	struct uart_port *port = &mpc52xx_uart_ports[co->index];
	unsigned int i, j;

	/* Disable interrupts */
	psc_ops->cw_disable_ints(port);

	/* Wait the TX buffer to be empty */
	j = 5000000;	/* Maximum wait */
	while (!mpc52xx_uart_tx_empty(port) && --j)
		udelay(1);

	/* Write all the chars */
	for (i = 0; i < count; i++, s++) {
		/* Line return handling */
		if (*s == '\n')
			psc_ops->write_char(port, '\r');

		/* Send the char */
		psc_ops->write_char(port, *s);

		/* Wait the TX buffer to be empty */
		j = 20000;	/* Maximum wait */
		while (!mpc52xx_uart_tx_empty(port) && --j)
			udelay(1);
	}

	/* Restore interrupt state */
	psc_ops->cw_restore_ints(port);
}

#if !defined(CONFIG_PPC_MERGE)
static int __init
mpc52xx_console_setup(struct console *co, char *options)
{
	struct uart_port *port = &mpc52xx_uart_ports[co->index];

	int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
	int bits = 8;
	int parity = 'n';
	int flow = 'n';

	if (co->index < 0 || co->index >= MPC52xx_PSC_MAXNUM)
		return -EINVAL;

	/* Basic port init. Needed since we use some uart_??? func before
	 * real init for early access */
	spin_lock_init(&port->lock);
	port->uartclk	= __res.bi_ipbfreq / 2; /* Look at CTLR doc */
	port->ops	= &mpc52xx_uart_ops;
	port->mapbase	= MPC52xx_PA(MPC52xx_PSCx_OFFSET(co->index+1));

	/* We ioremap ourself */
	port->membase = ioremap(port->mapbase, MPC52xx_PSC_SIZE);
	if (port->membase == NULL)
		return -EINVAL;

	/* Setup the port parameters accoding to options */
	if (options)
		uart_parse_options(options, &baud, &parity, &bits, &flow);
	else
		mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);

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

#else

static int __init
mpc52xx_console_setup(struct console *co, char *options)
{
	struct uart_port *port = &mpc52xx_uart_ports[co->index];
	struct device_node *np = mpc52xx_uart_nodes[co->index];
	unsigned int uartclk;
	struct resource res;
	int ret;

	int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
	int bits = 8;
	int parity = 'n';
	int flow = 'n';

	pr_debug("mpc52xx_console_setup co=%p, co->index=%i, options=%s\n",
		 co, co->index, options);

	if ((co->index < 0) || (co->index > MPC52xx_PSC_MAXNUM)) {
		pr_debug("PSC%x out of range\n", co->index);
		return -EINVAL;
	}

	if (!np) {
		pr_debug("PSC%x not found in device tree\n", co->index);
		return -EINVAL;
	}

	pr_debug("Console on ttyPSC%x is %s\n",
		 co->index, mpc52xx_uart_nodes[co->index]->full_name);

	/* Fetch register locations */
	ret = of_address_to_resource(np, 0, &res);
	if (ret) {
		pr_debug("Could not get resources for PSC%x\n", co->index);
		return ret;
	}

	uartclk = psc_ops->getuartclk(np);
	if (uartclk == 0) {
		pr_debug("Could not find uart clock frequency!\n");
		return -EINVAL;
	}

	/* Basic port init. Needed since we use some uart_??? func before
	 * real init for early access */
	spin_lock_init(&port->lock);
	port->uartclk = uartclk;
	port->ops	= &mpc52xx_uart_ops;
	port->mapbase = res.start;
	port->membase = ioremap(res.start, sizeof(struct mpc52xx_psc));
	port->irq = irq_of_parse_and_map(np, 0);

	if (port->membase == NULL)
		return -EINVAL;

	pr_debug("mpc52xx-psc uart at %p, mapped to %p, irq=%x, freq=%i\n",
		 (void *)port->mapbase, port->membase,
		 port->irq, port->uartclk);

	/* Setup the port parameters accoding to options */
	if (options)
		uart_parse_options(options, &baud, &parity, &bits, &flow);
	else
		mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);

	pr_debug("Setting console parameters: %i %i%c1 flow=%c\n",
		 baud, bits, parity, flow);

	return uart_set_options(port, co, baud, parity, bits, flow);
}
#endif /* defined(CONFIG_PPC_MERGE) */


static struct uart_driver mpc52xx_uart_driver;

static struct console mpc52xx_console = {
	.name	= "ttyPSC",
	.write	= mpc52xx_console_write,
	.device	= uart_console_device,
	.setup	= mpc52xx_console_setup,
	.flags	= CON_PRINTBUFFER,
	.index	= -1,	/* Specified on the cmdline (e.g. console=ttyPSC0) */
	.data	= &mpc52xx_uart_driver,
};


static int __init
mpc52xx_console_init(void)
{
#if defined(CONFIG_PPC_MERGE)
	mpc52xx_uart_of_enumerate();
#endif
	register_console(&mpc52xx_console);
	return 0;
}

console_initcall(mpc52xx_console_init);

#define MPC52xx_PSC_CONSOLE &mpc52xx_console
#else
#define MPC52xx_PSC_CONSOLE NULL
#endif


/* ======================================================================== */
/* UART Driver                                                              */
/* ======================================================================== */

static struct uart_driver mpc52xx_uart_driver = {
	.driver_name	= "mpc52xx_psc_uart",
	.dev_name	= "ttyPSC",
	.major		= SERIAL_PSC_MAJOR,
	.minor		= SERIAL_PSC_MINOR,
	.nr		= MPC52xx_PSC_MAXNUM,
	.cons		= MPC52xx_PSC_CONSOLE,
};


#if !defined(CONFIG_PPC_MERGE)
/* ======================================================================== */
/* Platform Driver                                                          */
/* ======================================================================== */

static int __devinit
mpc52xx_uart_probe(struct platform_device *dev)
{
	struct resource *res = dev->resource;

	struct uart_port *port = NULL;
	int i, idx, ret;

	/* Check validity & presence */
	idx = dev->id;
	if (idx < 0 || idx >= MPC52xx_PSC_MAXNUM)
		return -EINVAL;

	if (!mpc52xx_match_psc_function(idx, "uart"))
		return -ENODEV;

	/* Init the port structure */
	port = &mpc52xx_uart_ports[idx];

	spin_lock_init(&port->lock);
	port->uartclk	= __res.bi_ipbfreq / 2; /* Look at CTLR doc */
	port->fifosize	= 512;
	port->iotype	= UPIO_MEM;
	port->flags	= UPF_BOOT_AUTOCONF |
			  (uart_console(port) ? 0 : UPF_IOREMAP);
	port->line	= idx;
	port->ops	= &mpc52xx_uart_ops;
	port->dev	= &dev->dev;

	/* Search for IRQ and mapbase */
	for (i = 0 ; i < dev->num_resources ; i++, res++) {
		if (res->flags & IORESOURCE_MEM)
			port->mapbase = res->start;
		else if (res->flags & IORESOURCE_IRQ)
			port->irq = res->start;
	}
	if (!port->irq || !port->mapbase)
		return -EINVAL;

	/* Add the port to the uart sub-system */
	ret = uart_add_one_port(&mpc52xx_uart_driver, port);
	if (!ret)
		platform_set_drvdata(dev, (void *)port);

	return ret;
}

static int
mpc52xx_uart_remove(struct platform_device *dev)
{
	struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev);

	platform_set_drvdata(dev, NULL);

	if (port)
		uart_remove_one_port(&mpc52xx_uart_driver, port);

	return 0;
}

#ifdef CONFIG_PM
static int
mpc52xx_uart_suspend(struct platform_device *dev, pm_message_t state)
{
	struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev);

	if (port)
		uart_suspend_port(&mpc52xx_uart_driver, port);

	return 0;
}

static int
mpc52xx_uart_resume(struct platform_device *dev)
{
	struct uart_port *port = (struct uart_port *) platform_get_drvdata(dev);

	if (port)
		uart_resume_port(&mpc52xx_uart_driver, port);

	return 0;
}
#endif

/* work with hotplug and coldplug */
MODULE_ALIAS("platform:mpc52xx-psc");

static struct platform_driver mpc52xx_uart_platform_driver = {
	.probe		= mpc52xx_uart_probe,
	.remove		= mpc52xx_uart_remove,
#ifdef CONFIG_PM
	.suspend	= mpc52xx_uart_suspend,
	.resume		= mpc52xx_uart_resume,
#endif
	.driver		= {
		.owner	= THIS_MODULE,
		.name	= "mpc52xx-psc",
	},
};
#endif /* !defined(CONFIG_PPC_MERGE) */


#if defined(CONFIG_PPC_MERGE)
/* ======================================================================== */
/* OF Platform Driver                                                       */
/* ======================================================================== */

static struct of_device_id mpc52xx_uart_of_match[] = {
#ifdef CONFIG_PPC_MPC52xx
	{ .compatible = "fsl,mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
	/* binding used by old lite5200 device trees: */
	{ .compatible = "mpc5200-psc-uart", .data = &mpc52xx_psc_ops, },
	/* binding used by efika: */
	{ .compatible = "mpc5200-serial", .data = &mpc52xx_psc_ops, },
#endif
#ifdef CONFIG_PPC_MPC512x
	{ .compatible = "fsl,mpc5121-psc-uart", .data = &mpc512x_psc_ops, },
	{},
#endif
};

static int __devinit
mpc52xx_uart_of_probe(struct of_device *op, const struct of_device_id *match)
{
	int idx = -1;
	unsigned int uartclk;
	struct uart_port *port = NULL;
	struct resource res;
	int ret;

	dev_dbg(&op->dev, "mpc52xx_uart_probe(op=%p, match=%p)\n", op, match);

	/* Check validity & presence */
	for (idx = 0; idx < MPC52xx_PSC_MAXNUM; idx++)
		if (mpc52xx_uart_nodes[idx] == op->node)
			break;
	if (idx >= MPC52xx_PSC_MAXNUM)
		return -EINVAL;
	pr_debug("Found %s assigned to ttyPSC%x\n",
		 mpc52xx_uart_nodes[idx]->full_name, idx);

	uartclk = psc_ops->getuartclk(op->node);
	if (uartclk == 0) {
		dev_dbg(&op->dev, "Could not find uart clock frequency!\n");
		return -EINVAL;
	}

	/* Init the port structure */
	port = &mpc52xx_uart_ports[idx];

	spin_lock_init(&port->lock);
	port->uartclk = uartclk;
	port->fifosize	= 512;
	port->iotype	= UPIO_MEM;
	port->flags	= UPF_BOOT_AUTOCONF |
			  (uart_console(port) ? 0 : UPF_IOREMAP);
	port->line	= idx;
	port->ops	= &mpc52xx_uart_ops;
	port->dev	= &op->dev;

	/* Search for IRQ and mapbase */
	ret = of_address_to_resource(op->node, 0, &res);
	if (ret)
		return ret;

	port->mapbase = res.start;
	port->irq = irq_of_parse_and_map(op->node, 0);

	dev_dbg(&op->dev, "mpc52xx-psc uart at %p, irq=%x, freq=%i\n",
		(void *)port->mapbase, port->irq, port->uartclk);

	if ((port->irq == NO_IRQ) || !port->mapbase) {
		printk(KERN_ERR "Could not allocate resources for PSC\n");
		return -EINVAL;
	}

	/* Add the port to the uart sub-system */
	ret = uart_add_one_port(&mpc52xx_uart_driver, port);
	if (!ret)
		dev_set_drvdata(&op->dev, (void *)port);

	return ret;
}

static int
mpc52xx_uart_of_remove(struct of_device *op)
{
	struct uart_port *port = dev_get_drvdata(&op->dev);
	dev_set_drvdata(&op->dev, NULL);

	if (port) {
		uart_remove_one_port(&mpc52xx_uart_driver, port);
		irq_dispose_mapping(port->irq);
	}

	return 0;
}

#ifdef CONFIG_PM
static int
mpc52xx_uart_of_suspend(struct of_device *op, pm_message_t state)
{
	struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);

	if (port)
		uart_suspend_port(&mpc52xx_uart_driver, port);

	return 0;
}

static int
mpc52xx_uart_of_resume(struct of_device *op)
{
	struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);

	if (port)
		uart_resume_port(&mpc52xx_uart_driver, port);

	return 0;
}
#endif

static void
mpc52xx_uart_of_assign(struct device_node *np, int idx)
{
	int free_idx = -1;
	int i;

	/* Find the first free node */
	for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
		if (mpc52xx_uart_nodes[i] == NULL) {
			free_idx = i;
			break;
		}
	}

	if ((idx < 0) || (idx >= MPC52xx_PSC_MAXNUM))
		idx = free_idx;

	if (idx < 0)
		return; /* No free slot; abort */

	of_node_get(np);
	/* If the slot is already occupied, then swap slots */
	if (mpc52xx_uart_nodes[idx] && (free_idx != -1))
		mpc52xx_uart_nodes[free_idx] = mpc52xx_uart_nodes[idx];
	mpc52xx_uart_nodes[idx] = np;
}

static void
mpc52xx_uart_of_enumerate(void)
{
	static int enum_done;
	struct device_node *np;
	const unsigned int *devno;
	const struct  of_device_id *match;
	int i;

	if (enum_done)
		return;

	for_each_node_by_type(np, "serial") {
		match = of_match_node(mpc52xx_uart_of_match, np);
		if (!match)
			continue;

		psc_ops = match->data;

		/* Is a particular device number requested? */
		devno = of_get_property(np, "port-number", NULL);
		mpc52xx_uart_of_assign(np, devno ? *devno : -1);
	}

	enum_done = 1;

	for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
		if (mpc52xx_uart_nodes[i])
			pr_debug("%s assigned to ttyPSC%x\n",
				 mpc52xx_uart_nodes[i]->full_name, i);
	}
}

MODULE_DEVICE_TABLE(of, mpc52xx_uart_of_match);

static struct of_platform_driver mpc52xx_uart_of_driver = {
	.match_table	= mpc52xx_uart_of_match,
	.probe		= mpc52xx_uart_of_probe,
	.remove		= mpc52xx_uart_of_remove,
#ifdef CONFIG_PM
	.suspend	= mpc52xx_uart_of_suspend,
	.resume		= mpc52xx_uart_of_resume,
#endif
	.driver		= {
		.name	= "mpc52xx-psc-uart",
	},
};
#endif /* defined(CONFIG_PPC_MERGE) */


/* ======================================================================== */
/* Module                                                                   */
/* ======================================================================== */

static int __init
mpc52xx_uart_init(void)
{
	int ret;

	printk(KERN_INFO "Serial: MPC52xx PSC UART driver\n");

	ret = uart_register_driver(&mpc52xx_uart_driver);
	if (ret) {
		printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
		       __FILE__, ret);
		return ret;
	}

#if defined(CONFIG_PPC_MERGE)
	mpc52xx_uart_of_enumerate();

	ret = of_register_platform_driver(&mpc52xx_uart_of_driver);
	if (ret) {
		printk(KERN_ERR "%s: of_register_platform_driver failed (%i)\n",
		       __FILE__, ret);
		uart_unregister_driver(&mpc52xx_uart_driver);
		return ret;
	}
#else
	psc_ops = &mpc52xx_psc_ops;
	ret = platform_driver_register(&mpc52xx_uart_platform_driver);
	if (ret) {
		printk(KERN_ERR "%s: platform_driver_register failed (%i)\n",
		       __FILE__, ret);
		uart_unregister_driver(&mpc52xx_uart_driver);
		return ret;
	}
#endif

	return 0;
}

static void __exit
mpc52xx_uart_exit(void)
{
#if defined(CONFIG_PPC_MERGE)
	of_unregister_platform_driver(&mpc52xx_uart_of_driver);
#else
	platform_driver_unregister(&mpc52xx_uart_platform_driver);
#endif
	uart_unregister_driver(&mpc52xx_uart_driver);
}


module_init(mpc52xx_uart_init);
module_exit(mpc52xx_uart_exit);

MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>");
MODULE_DESCRIPTION("Freescale MPC52xx PSC UART");
MODULE_LICENSE("GPL");