aboutsummaryrefslogtreecommitdiff
path: root/drivers/ata/pata_macio.c
blob: a02f76fdcfcd37df9062880424a68d94d9970bc1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
/*
 * Libata based driver for Apple "macio" family of PATA controllers
 *
 * Copyright 2008/2009 Benjamin Herrenschmidt, IBM Corp
 *                     <benh@kernel.crashing.org>
 *
 * Some bits and pieces from drivers/ide/ppc/pmac.c
 *
 */

#undef DEBUG
#undef DEBUG_DMA

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/ata.h>
#include <linux/libata.h>
#include <linux/adb.h>
#include <linux/pmu.h>
#include <linux/scatterlist.h>
#include <linux/of.h>
#include <linux/gfp.h>

#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>

#include <asm/macio.h>
#include <asm/io.h>
#include <asm/dbdma.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/mediabay.h>

#ifdef DEBUG_DMA
#define dev_dbgdma(dev, format, arg...)		\
	dev_printk(KERN_DEBUG , dev , format , ## arg)
#else
#define dev_dbgdma(dev, format, arg...)		\
	({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
#endif

#define DRV_NAME	"pata_macio"
#define DRV_VERSION	"0.9"

/* Models of macio ATA controller */
enum {
	controller_ohare,	/* OHare based */
	controller_heathrow,	/* Heathrow/Paddington */
	controller_kl_ata3,	/* KeyLargo ATA-3 */
	controller_kl_ata4,	/* KeyLargo ATA-4 */
	controller_un_ata6,	/* UniNorth2 ATA-6 */
	controller_k2_ata6,	/* K2 ATA-6 */
	controller_sh_ata6,	/* Shasta ATA-6 */
};

static const char* macio_ata_names[] = {
	"OHare ATA",		/* OHare based */
	"Heathrow ATA",		/* Heathrow/Paddington */
	"KeyLargo ATA-3",	/* KeyLargo ATA-3 (MDMA only) */
	"KeyLargo ATA-4",	/* KeyLargo ATA-4 (UDMA/66) */
	"UniNorth ATA-6",	/* UniNorth2 ATA-6 (UDMA/100) */
	"K2 ATA-6",		/* K2 ATA-6 (UDMA/100) */
	"Shasta ATA-6",		/* Shasta ATA-6 (UDMA/133) */
};

/*
 * Extra registers, both 32-bit little-endian
 */
#define IDE_TIMING_CONFIG	0x200
#define IDE_INTERRUPT		0x300

/* Kauai (U2) ATA has different register setup */
#define IDE_KAUAI_PIO_CONFIG	0x200
#define IDE_KAUAI_ULTRA_CONFIG	0x210
#define IDE_KAUAI_POLL_CONFIG	0x220

/*
 * Timing configuration register definitions
 */

/* Number of IDE_SYSCLK_NS ticks, argument is in nanoseconds */
#define SYSCLK_TICKS(t)		(((t) + IDE_SYSCLK_NS - 1) / IDE_SYSCLK_NS)
#define SYSCLK_TICKS_66(t)	(((t) + IDE_SYSCLK_66_NS - 1) / IDE_SYSCLK_66_NS)
#define IDE_SYSCLK_NS		30	/* 33Mhz cell */
#define IDE_SYSCLK_66_NS	15	/* 66Mhz cell */

/* 133Mhz cell, found in shasta.
 * See comments about 100 Mhz Uninorth 2...
 * Note that PIO_MASK and MDMA_MASK seem to overlap, that's just
 * weird and I don't now why .. at this stage
 */
#define TR_133_PIOREG_PIO_MASK		0xff000fff
#define TR_133_PIOREG_MDMA_MASK		0x00fff800
#define TR_133_UDMAREG_UDMA_MASK	0x0003ffff
#define TR_133_UDMAREG_UDMA_EN		0x00000001

/* 100Mhz cell, found in Uninorth 2 and K2. It appears as a pci device
 * (106b/0033) on uninorth or K2 internal PCI bus and it's clock is
 * controlled like gem or fw. It appears to be an evolution of keylargo
 * ATA4 with a timing register extended to 2x32bits registers (one
 * for PIO & MWDMA and one for UDMA, and a similar DBDMA channel.
 * It has it's own local feature control register as well.
 *
 * After scratching my mind over the timing values, at least for PIO
 * and MDMA, I think I've figured the format of the timing register,
 * though I use pre-calculated tables for UDMA as usual...
 */
#define TR_100_PIO_ADDRSETUP_MASK	0xff000000 /* Size of field unknown */
#define TR_100_PIO_ADDRSETUP_SHIFT	24
#define TR_100_MDMA_MASK		0x00fff000
#define TR_100_MDMA_RECOVERY_MASK	0x00fc0000
#define TR_100_MDMA_RECOVERY_SHIFT	18
#define TR_100_MDMA_ACCESS_MASK		0x0003f000
#define TR_100_MDMA_ACCESS_SHIFT	12
#define TR_100_PIO_MASK			0xff000fff
#define TR_100_PIO_RECOVERY_MASK	0x00000fc0
#define TR_100_PIO_RECOVERY_SHIFT	6
#define TR_100_PIO_ACCESS_MASK		0x0000003f
#define TR_100_PIO_ACCESS_SHIFT		0

#define TR_100_UDMAREG_UDMA_MASK	0x0000ffff
#define TR_100_UDMAREG_UDMA_EN		0x00000001


/* 66Mhz cell, found in KeyLargo. Can do ultra mode 0 to 2 on
 * 40 connector cable and to 4 on 80 connector one.
 * Clock unit is 15ns (66Mhz)
 *
 * 3 Values can be programmed:
 *  - Write data setup, which appears to match the cycle time. They
 *    also call it DIOW setup.
 *  - Ready to pause time (from spec)
 *  - Address setup. That one is weird. I don't see where exactly
 *    it fits in UDMA cycles, I got it's name from an obscure piece
 *    of commented out code in Darwin. They leave it to 0, we do as
 *    well, despite a comment that would lead to think it has a
 *    min value of 45ns.
 * Apple also add 60ns to the write data setup (or cycle time ?) on
 * reads.
 */
#define TR_66_UDMA_MASK			0xfff00000
#define TR_66_UDMA_EN			0x00100000 /* Enable Ultra mode for DMA */
#define TR_66_PIO_ADDRSETUP_MASK	0xe0000000 /* Address setup */
#define TR_66_PIO_ADDRSETUP_SHIFT	29
#define TR_66_UDMA_RDY2PAUS_MASK	0x1e000000 /* Ready 2 pause time */
#define TR_66_UDMA_RDY2PAUS_SHIFT	25
#define TR_66_UDMA_WRDATASETUP_MASK	0x01e00000 /* Write data setup time */
#define TR_66_UDMA_WRDATASETUP_SHIFT	21
#define TR_66_MDMA_MASK			0x000ffc00
#define TR_66_MDMA_RECOVERY_MASK	0x000f8000
#define TR_66_MDMA_RECOVERY_SHIFT	15
#define TR_66_MDMA_ACCESS_MASK		0x00007c00
#define TR_66_MDMA_ACCESS_SHIFT		10
#define TR_66_PIO_MASK			0xe00003ff
#define TR_66_PIO_RECOVERY_MASK		0x000003e0
#define TR_66_PIO_RECOVERY_SHIFT	5
#define TR_66_PIO_ACCESS_MASK		0x0000001f
#define TR_66_PIO_ACCESS_SHIFT		0

/* 33Mhz cell, found in OHare, Heathrow (& Paddington) and KeyLargo
 * Can do pio & mdma modes, clock unit is 30ns (33Mhz)
 *
 * The access time and recovery time can be programmed. Some older
 * Darwin code base limit OHare to 150ns cycle time. I decided to do
 * the same here fore safety against broken old hardware ;)
 * The HalfTick bit, when set, adds half a clock (15ns) to the access
 * time and removes one from recovery. It's not supported on KeyLargo
 * implementation afaik. The E bit appears to be set for PIO mode 0 and
 * is used to reach long timings used in this mode.
 */
#define TR_33_MDMA_MASK			0x003ff800
#define TR_33_MDMA_RECOVERY_MASK	0x001f0000
#define TR_33_MDMA_RECOVERY_SHIFT	16
#define TR_33_MDMA_ACCESS_MASK		0x0000f800
#define TR_33_MDMA_ACCESS_SHIFT		11
#define TR_33_MDMA_HALFTICK		0x00200000
#define TR_33_PIO_MASK			0x000007ff
#define TR_33_PIO_E			0x00000400
#define TR_33_PIO_RECOVERY_MASK		0x000003e0
#define TR_33_PIO_RECOVERY_SHIFT	5
#define TR_33_PIO_ACCESS_MASK		0x0000001f
#define TR_33_PIO_ACCESS_SHIFT		0

/*
 * Interrupt register definitions. Only present on newer cells
 * (Keylargo and later afaik) so we don't use it.
 */
#define IDE_INTR_DMA			0x80000000
#define IDE_INTR_DEVICE			0x40000000

/*
 * FCR Register on Kauai. Not sure what bit 0x4 is  ...
 */
#define KAUAI_FCR_UATA_MAGIC		0x00000004
#define KAUAI_FCR_UATA_RESET_N		0x00000002
#define KAUAI_FCR_UATA_ENABLE		0x00000001


/* Allow up to 256 DBDMA commands per xfer */
#define MAX_DCMDS		256

/* Don't let a DMA segment go all the way to 64K */
#define MAX_DBDMA_SEG		0xff00


/*
 * Wait 1s for disk to answer on IDE bus after a hard reset
 * of the device (via GPIO/FCR).
 *
 * Some devices seem to "pollute" the bus even after dropping
 * the BSY bit (typically some combo drives slave on the UDMA
 * bus) after a hard reset. Since we hard reset all drives on
 * KeyLargo ATA66, we have to keep that delay around. I may end
 * up not hard resetting anymore on these and keep the delay only
 * for older interfaces instead (we have to reset when coming
 * from MacOS...) --BenH.
 */
#define IDE_WAKEUP_DELAY_MS	1000

struct pata_macio_timing;

struct pata_macio_priv {
	int				kind;
	int				aapl_bus_id;
	int				mediabay : 1;
	struct device_node		*node;
	struct macio_dev		*mdev;
	struct pci_dev			*pdev;
	struct device			*dev;
	int				irq;
	u32				treg[2][2];
	void __iomem			*tfregs;
	void __iomem			*kauai_fcr;
	struct dbdma_cmd *		dma_table_cpu;
	dma_addr_t			dma_table_dma;
	struct ata_host			*host;
	const struct pata_macio_timing	*timings;
};

/* Previous variants of this driver used to calculate timings
 * for various variants of the chip and use tables for others.
 *
 * Not only was this confusing, but in addition, it isn't clear
 * whether our calculation code was correct. It didn't entirely
 * match the darwin code and whatever documentation I could find
 * on these cells
 *
 * I decided to entirely rely on a table instead for this version
 * of the driver. Also, because I don't really care about derated
 * modes and really old HW other than making it work, I'm not going
 * to calculate / snoop timing values for something else than the
 * standard modes.
 */
struct pata_macio_timing {
	int	mode;
	u32	reg1;	/* Bits to set in first timing reg */
	u32	reg2;	/* Bits to set in second timing reg */
};

static const struct pata_macio_timing pata_macio_ohare_timings[] = {
	{ XFER_PIO_0,		0x00000526,	0, },
	{ XFER_PIO_1,		0x00000085,	0, },
	{ XFER_PIO_2,		0x00000025,	0, },
	{ XFER_PIO_3,		0x00000025,	0, },
	{ XFER_PIO_4,		0x00000025,	0, },
	{ XFER_MW_DMA_0,	0x00074000,	0, },
	{ XFER_MW_DMA_1,	0x00221000,	0, },
	{ XFER_MW_DMA_2,	0x00211000,	0, },
	{ -1, 0, 0 }
};

static const struct pata_macio_timing pata_macio_heathrow_timings[] = {
	{ XFER_PIO_0,		0x00000526,	0, },
	{ XFER_PIO_1,		0x00000085,	0, },
	{ XFER_PIO_2,		0x00000025,	0, },
	{ XFER_PIO_3,		0x00000025,	0, },
	{ XFER_PIO_4,		0x00000025,	0, },
	{ XFER_MW_DMA_0,	0x00074000,	0, },
	{ XFER_MW_DMA_1,	0x00221000,	0, },
	{ XFER_MW_DMA_2,	0x00211000,	0, },
	{ -1, 0, 0 }
};

static const struct pata_macio_timing pata_macio_kl33_timings[] = {
	{ XFER_PIO_0,		0x00000526,	0, },
	{ XFER_PIO_1,		0x00000085,	0, },
	{ XFER_PIO_2,		0x00000025,	0, },
	{ XFER_PIO_3,		0x00000025,	0, },
	{ XFER_PIO_4,		0x00000025,	0, },
	{ XFER_MW_DMA_0,	0x00084000,	0, },
	{ XFER_MW_DMA_1,	0x00021800,	0, },
	{ XFER_MW_DMA_2,	0x00011800,	0, },
	{ -1, 0, 0 }
};

static const struct pata_macio_timing pata_macio_kl66_timings[] = {
	{ XFER_PIO_0,		0x0000038c,	0, },
	{ XFER_PIO_1,		0x0000020a,	0, },
	{ XFER_PIO_2,		0x00000127,	0, },
	{ XFER_PIO_3,		0x000000c6,	0, },
	{ XFER_PIO_4,		0x00000065,	0, },
	{ XFER_MW_DMA_0,	0x00084000,	0, },
	{ XFER_MW_DMA_1,	0x00029800,	0, },
	{ XFER_MW_DMA_2,	0x00019400,	0, },
	{ XFER_UDMA_0,		0x19100000,	0, },
	{ XFER_UDMA_1,		0x14d00000,	0, },
	{ XFER_UDMA_2,		0x10900000,	0, },
	{ XFER_UDMA_3,		0x0c700000,	0, },
	{ XFER_UDMA_4,		0x0c500000,	0, },
	{ -1, 0, 0 }
};

static const struct pata_macio_timing pata_macio_kauai_timings[] = {
	{ XFER_PIO_0,		0x08000a92,	0, },
	{ XFER_PIO_1,		0x0800060f,	0, },
	{ XFER_PIO_2,		0x0800038b,	0, },
	{ XFER_PIO_3,		0x05000249,	0, },
	{ XFER_PIO_4,		0x04000148,	0, },
	{ XFER_MW_DMA_0,	0x00618000,	0, },
	{ XFER_MW_DMA_1,	0x00209000,	0, },
	{ XFER_MW_DMA_2,	0x00148000,	0, },
	{ XFER_UDMA_0,		         0,	0x000070c1, },
	{ XFER_UDMA_1,		         0,	0x00005d81, },
	{ XFER_UDMA_2,		         0,	0x00004a61, },
	{ XFER_UDMA_3,		         0,	0x00003a51, },
	{ XFER_UDMA_4,		         0,	0x00002a31, },
	{ XFER_UDMA_5,		         0,	0x00002921, },
	{ -1, 0, 0 }
};

static const struct pata_macio_timing pata_macio_shasta_timings[] = {
	{ XFER_PIO_0,		0x0a000c97,	0, },
	{ XFER_PIO_1,		0x07000712,	0, },
	{ XFER_PIO_2,		0x040003cd,	0, },
	{ XFER_PIO_3,		0x0500028b,	0, },
	{ XFER_PIO_4,		0x0400010a,	0, },
	{ XFER_MW_DMA_0,	0x00820800,	0, },
	{ XFER_MW_DMA_1,	0x0028b000,	0, },
	{ XFER_MW_DMA_2,	0x001ca000,	0, },
	{ XFER_UDMA_0,		         0,	0x00035901, },
	{ XFER_UDMA_1,		         0,	0x000348b1, },
	{ XFER_UDMA_2,		         0,	0x00033881, },
	{ XFER_UDMA_3,		         0,	0x00033861, },
	{ XFER_UDMA_4,		         0,	0x00033841, },
	{ XFER_UDMA_5,		         0,	0x00033031, },
	{ XFER_UDMA_6,		         0,	0x00033021, },
	{ -1, 0, 0 }
};

static const struct pata_macio_timing *pata_macio_find_timing(
					    struct pata_macio_priv *priv,
					    int mode)
{
	int i;

	for (i = 0; priv->timings[i].mode > 0; i++) {
		if (priv->timings[i].mode == mode)
			return &priv->timings[i];
	}
	return NULL;
}


static void pata_macio_apply_timings(struct ata_port *ap, unsigned int device)
{
	struct pata_macio_priv *priv = ap->private_data;
	void __iomem *rbase = ap->ioaddr.cmd_addr;

	if (priv->kind == controller_sh_ata6 ||
	    priv->kind == controller_un_ata6 ||
	    priv->kind == controller_k2_ata6) {
		writel(priv->treg[device][0], rbase + IDE_KAUAI_PIO_CONFIG);
		writel(priv->treg[device][1], rbase + IDE_KAUAI_ULTRA_CONFIG);
	} else
		writel(priv->treg[device][0], rbase + IDE_TIMING_CONFIG);
}

static void pata_macio_dev_select(struct ata_port *ap, unsigned int device)
{
	ata_sff_dev_select(ap, device);

	/* Apply timings */
	pata_macio_apply_timings(ap, device);
}

static void pata_macio_set_timings(struct ata_port *ap,
				   struct ata_device *adev)
{
	struct pata_macio_priv *priv = ap->private_data;
	const struct pata_macio_timing *t;

	dev_dbg(priv->dev, "Set timings: DEV=%d,PIO=0x%x (%s),DMA=0x%x (%s)\n",
		adev->devno,
		adev->pio_mode,
		ata_mode_string(ata_xfer_mode2mask(adev->pio_mode)),
		adev->dma_mode,
		ata_mode_string(ata_xfer_mode2mask(adev->dma_mode)));

	/* First clear timings */
	priv->treg[adev->devno][0] = priv->treg[adev->devno][1] = 0;

	/* Now get the PIO timings */
	t = pata_macio_find_timing(priv, adev->pio_mode);
	if (t == NULL) {
		dev_warn(priv->dev, "Invalid PIO timing requested: 0x%x\n",
			 adev->pio_mode);
		t = pata_macio_find_timing(priv, XFER_PIO_0);
	}
	BUG_ON(t == NULL);

	/* PIO timings only ever use the first treg */
	priv->treg[adev->devno][0] |= t->reg1;

	/* Now get DMA timings */
	t = pata_macio_find_timing(priv, adev->dma_mode);
	if (t == NULL || (t->reg1 == 0 && t->reg2 == 0)) {
		dev_dbg(priv->dev, "DMA timing not set yet, using MW_DMA_0\n");
		t = pata_macio_find_timing(priv, XFER_MW_DMA_0);
	}
	BUG_ON(t == NULL);

	/* DMA timings can use both tregs */
	priv->treg[adev->devno][0] |= t->reg1;
	priv->treg[adev->devno][1] |= t->reg2;

	dev_dbg(priv->dev, " -> %08x %08x\n",
		priv->treg[adev->devno][0],
		priv->treg[adev->devno][1]);

	/* Apply to hardware */
	pata_macio_apply_timings(ap, adev->devno);
}

/*
 * Blast some well known "safe" values to the timing registers at init or
 * wakeup from sleep time, before we do real calculation
 */
static void pata_macio_default_timings(struct pata_macio_priv *priv)
{
	unsigned int value, value2 = 0;

	switch(priv->kind) {
		case controller_sh_ata6:
			value = 0x0a820c97;
			value2 = 0x00033031;
			break;
		case controller_un_ata6:
		case controller_k2_ata6:
			value = 0x08618a92;
			value2 = 0x00002921;
			break;
		case controller_kl_ata4:
			value = 0x0008438c;
			break;
		case controller_kl_ata3:
			value = 0x00084526;
			break;
		case controller_heathrow:
		case controller_ohare:
		default:
			value = 0x00074526;
			break;
	}
	priv->treg[0][0] = priv->treg[1][0] = value;
	priv->treg[0][1] = priv->treg[1][1] = value2;
}

static int pata_macio_cable_detect(struct ata_port *ap)
{
	struct pata_macio_priv *priv = ap->private_data;

	/* Get cable type from device-tree */
	if (priv->kind == controller_kl_ata4 ||
	    priv->kind == controller_un_ata6 ||
	    priv->kind == controller_k2_ata6 ||
	    priv->kind == controller_sh_ata6) {
		const char* cable = of_get_property(priv->node, "cable-type",
						    NULL);
		struct device_node *root = of_find_node_by_path("/");
		const char *model = of_get_property(root, "model", NULL);

		if (cable && !strncmp(cable, "80-", 3)) {
			/* Some drives fail to detect 80c cable in PowerBook
			 * These machine use proprietary short IDE cable
			 * anyway
			 */
			if (!strncmp(model, "PowerBook", 9))
				return ATA_CBL_PATA40_SHORT;
			else
				return ATA_CBL_PATA80;
		}
	}

	/* G5's seem to have incorrect cable type in device-tree.
	 * Let's assume they always have a 80 conductor cable, this seem to
	 * be always the case unless the user mucked around
	 */
	if (of_device_is_compatible(priv->node, "K2-UATA") ||
	    of_device_is_compatible(priv->node, "shasta-ata"))
		return ATA_CBL_PATA80;

	/* Anything else is 40 connectors */
	return ATA_CBL_PATA40;
}

static void pata_macio_qc_prep(struct ata_queued_cmd *qc)
{
	unsigned int write = (qc->tf.flags & ATA_TFLAG_WRITE);
	struct ata_port *ap = qc->ap;
	struct pata_macio_priv *priv = ap->private_data;
	struct scatterlist *sg;
	struct dbdma_cmd *table;
	unsigned int si, pi;

	dev_dbgdma(priv->dev, "%s: qc %p flags %lx, write %d dev %d\n",
		   __func__, qc, qc->flags, write, qc->dev->devno);

	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
		return;

	table = (struct dbdma_cmd *) priv->dma_table_cpu;

	pi = 0;
	for_each_sg(qc->sg, sg, qc->n_elem, si) {
		u32 addr, sg_len, len;

		/* determine if physical DMA addr spans 64K boundary.
		 * Note h/w doesn't support 64-bit, so we unconditionally
		 * truncate dma_addr_t to u32.
		 */
		addr = (u32) sg_dma_address(sg);
		sg_len = sg_dma_len(sg);

		while (sg_len) {
			/* table overflow should never happen */
			BUG_ON (pi++ >= MAX_DCMDS);

			len = (sg_len < MAX_DBDMA_SEG) ? sg_len : MAX_DBDMA_SEG;
			st_le16(&table->command, write ? OUTPUT_MORE: INPUT_MORE);
			st_le16(&table->req_count, len);
			st_le32(&table->phy_addr, addr);
			table->cmd_dep = 0;
			table->xfer_status = 0;
			table->res_count = 0;
			addr += len;
			sg_len -= len;
			++table;
		}
	}

	/* Should never happen according to Tejun */
	BUG_ON(!pi);

	/* Convert the last command to an input/output */
	table--;
	st_le16(&table->command, write ? OUTPUT_LAST: INPUT_LAST);
	table++;

	/* Add the stop command to the end of the list */
	memset(table, 0, sizeof(struct dbdma_cmd));
	st_le16(&table->command, DBDMA_STOP);

	dev_dbgdma(priv->dev, "%s: %d DMA list entries\n", __func__, pi);
}


static void pata_macio_freeze(struct ata_port *ap)
{
	struct dbdma_regs __iomem *dma_regs = ap->ioaddr.bmdma_addr;

	if (dma_regs) {
		unsigned int timeout = 1000000;

		/* Make sure DMA controller is stopped */
		writel((RUN|PAUSE|FLUSH|WAKE|DEAD) << 16, &dma_regs->control);
		while (--timeout && (readl(&dma_regs->status) & RUN))
			udelay(1);
	}

	ata_sff_freeze(ap);
}


static void pata_macio_bmdma_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	struct pata_macio_priv *priv = ap->private_data;
	struct dbdma_regs __iomem *dma_regs = ap->ioaddr.bmdma_addr;
	int dev = qc->dev->devno;

	dev_dbgdma(priv->dev, "%s: qc %p\n", __func__, qc);

	/* Make sure DMA commands updates are visible */
	writel(priv->dma_table_dma, &dma_regs->cmdptr);

	/* On KeyLargo 66Mhz cell, we need to add 60ns to wrDataSetup on
	 * UDMA reads
	 */
	if (priv->kind == controller_kl_ata4 &&
	    (priv->treg[dev][0] & TR_66_UDMA_EN)) {
		void __iomem *rbase = ap->ioaddr.cmd_addr;
		u32 reg = priv->treg[dev][0];

		if (!(qc->tf.flags & ATA_TFLAG_WRITE))
			reg += 0x00800000;
		writel(reg, rbase + IDE_TIMING_CONFIG);
	}

	/* issue r/w command */
	ap->ops->sff_exec_command(ap, &qc->tf);
}

static void pata_macio_bmdma_start(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	struct pata_macio_priv *priv = ap->private_data;
	struct dbdma_regs __iomem *dma_regs = ap->ioaddr.bmdma_addr;

	dev_dbgdma(priv->dev, "%s: qc %p\n", __func__, qc);

	writel((RUN << 16) | RUN, &dma_regs->control);
	/* Make sure it gets to the controller right now */
	(void)readl(&dma_regs->control);
}

static void pata_macio_bmdma_stop(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	struct pata_macio_priv *priv = ap->private_data;
	struct dbdma_regs __iomem *dma_regs = ap->ioaddr.bmdma_addr;
	unsigned int timeout = 1000000;

	dev_dbgdma(priv->dev, "%s: qc %p\n", __func__, qc);

	/* Stop the DMA engine and wait for it to full halt */
	writel (((RUN|WAKE|DEAD) << 16), &dma_regs->control);
	while (--timeout && (readl(&dma_regs->status) & RUN))
		udelay(1);
}

static u8 pata_macio_bmdma_status(struct ata_port *ap)
{
	struct pata_macio_priv *priv = ap->private_data;
	struct dbdma_regs __iomem *dma_regs = ap->ioaddr.bmdma_addr;
	u32 dstat, rstat = ATA_DMA_INTR;
	unsigned long timeout = 0;

	dstat = readl(&dma_regs->status);

	dev_dbgdma(priv->dev, "%s: dstat=%x\n", __func__, dstat);

	/* We have two things to deal with here:
	 *
	 * - The dbdma won't stop if the command was started
	 * but completed with an error without transferring all
	 * datas. This happens when bad blocks are met during
	 * a multi-block transfer.
	 *
	 * - The dbdma fifo hasn't yet finished flushing to
	 * to system memory when the disk interrupt occurs.
	 *
	 */

	/* First check for errors */
	if ((dstat & (RUN|DEAD)) != RUN)
		rstat |= ATA_DMA_ERR;

	/* If ACTIVE is cleared, the STOP command has been hit and
	 * the transfer is complete. If not, we have to flush the
	 * channel.
	 */
	if ((dstat & ACTIVE) == 0)
		return rstat;

	dev_dbgdma(priv->dev, "%s: DMA still active, flushing...\n", __func__);

	/* If dbdma didn't execute the STOP command yet, the
	 * active bit is still set. We consider that we aren't
	 * sharing interrupts (which is hopefully the case with
	 * those controllers) and so we just try to flush the
	 * channel for pending data in the fifo
	 */
	udelay(1);
	writel((FLUSH << 16) | FLUSH, &dma_regs->control);
	for (;;) {
		udelay(1);
		dstat = readl(&dma_regs->status);
		if ((dstat & FLUSH) == 0)
			break;
		if (++timeout > 1000) {
			dev_warn(priv->dev, "timeout flushing DMA\n");
			rstat |= ATA_DMA_ERR;
			break;
		}
	}
	return rstat;
}

/* port_start is when we allocate the DMA command list */
static int pata_macio_port_start(struct ata_port *ap)
{
	struct pata_macio_priv *priv = ap->private_data;

	if (ap->ioaddr.bmdma_addr == NULL)
		return 0;

	/* Allocate space for the DBDMA commands.
	 *
	 * The +2 is +1 for the stop command and +1 to allow for
	 * aligning the start address to a multiple of 16 bytes.
	 */
	priv->dma_table_cpu =
		dmam_alloc_coherent(priv->dev,
				    (MAX_DCMDS + 2) * sizeof(struct dbdma_cmd),
				    &priv->dma_table_dma, GFP_KERNEL);
	if (priv->dma_table_cpu == NULL) {
		dev_err(priv->dev, "Unable to allocate DMA command list\n");
		ap->ioaddr.bmdma_addr = NULL;
		ap->mwdma_mask = 0;
		ap->udma_mask = 0;
	}
	return 0;
}

static void pata_macio_irq_clear(struct ata_port *ap)
{
	struct pata_macio_priv *priv = ap->private_data;

	/* Nothing to do here */

	dev_dbgdma(priv->dev, "%s\n", __func__);
}

static void pata_macio_reset_hw(struct pata_macio_priv *priv, int resume)
{
	dev_dbg(priv->dev, "Enabling & resetting... \n");

	if (priv->mediabay)
		return;

	if (priv->kind == controller_ohare && !resume) {
		/* The code below is having trouble on some ohare machines
		 * (timing related ?). Until I can put my hand on one of these
		 * units, I keep the old way
		 */
		ppc_md.feature_call(PMAC_FTR_IDE_ENABLE, priv->node, 0, 1);
	} else {
		int rc;

 		/* Reset and enable controller */
		rc = ppc_md.feature_call(PMAC_FTR_IDE_RESET,
					 priv->node, priv->aapl_bus_id, 1);
		ppc_md.feature_call(PMAC_FTR_IDE_ENABLE,
				    priv->node, priv->aapl_bus_id, 1);
		msleep(10);
		/* Only bother waiting if there's a reset control */
		if (rc == 0) {
			ppc_md.feature_call(PMAC_FTR_IDE_RESET,
					    priv->node, priv->aapl_bus_id, 0);
			msleep(IDE_WAKEUP_DELAY_MS);
		}
	}

	/* If resuming a PCI device, restore the config space here */
	if (priv->pdev && resume) {
		int rc;

		pci_restore_state(priv->pdev);
		rc = pcim_enable_device(priv->pdev);
		if (rc)
			dev_err(&priv->pdev->dev,
				"Failed to enable device after resume (%d)\n",
				rc);
		else
			pci_set_master(priv->pdev);
	}

	/* On Kauai, initialize the FCR. We don't perform a reset, doesn't really
	 * seem necessary and speeds up the boot process
	 */
	if (priv->kauai_fcr)
		writel(KAUAI_FCR_UATA_MAGIC |
		       KAUAI_FCR_UATA_RESET_N |
		       KAUAI_FCR_UATA_ENABLE, priv->kauai_fcr);
}

/* Hook the standard slave config to fixup some HW related alignment
 * restrictions
 */
static int pata_macio_slave_config(struct scsi_device *sdev)
{
	struct ata_port *ap = ata_shost_to_port(sdev->host);
	struct pata_macio_priv *priv = ap->private_data;
	struct ata_device *dev;
	u16 cmd;
	int rc;

	/* First call original */
	rc = ata_scsi_slave_config(sdev);
	if (rc)
		return rc;

	/* This is lifted from sata_nv */
	dev = &ap->link.device[sdev->id];

	/* OHare has issues with non cache aligned DMA on some chipsets */
	if (priv->kind == controller_ohare) {
		blk_queue_update_dma_alignment(sdev->request_queue, 31);
		blk_queue_update_dma_pad(sdev->request_queue, 31);

		/* Tell the world about it */
		ata_dev_info(dev, "OHare alignment limits applied\n");
		return 0;
	}

	/* We only have issues with ATAPI */
	if (dev->class != ATA_DEV_ATAPI)
		return 0;

	/* Shasta and K2 seem to have "issues" with reads ... */
	if (priv->kind == controller_sh_ata6 || priv->kind == controller_k2_ata6) {
		/* Allright these are bad, apply restrictions */
		blk_queue_update_dma_alignment(sdev->request_queue, 15);
		blk_queue_update_dma_pad(sdev->request_queue, 15);

		/* We enable MWI and hack cache line size directly here, this
		 * is specific to this chipset and not normal values, we happen
		 * to somewhat know what we are doing here (which is basically
		 * to do the same Apple does and pray they did not get it wrong :-)
		 */
		BUG_ON(!priv->pdev);
		pci_write_config_byte(priv->pdev, PCI_CACHE_LINE_SIZE, 0x08);
		pci_read_config_word(priv->pdev, PCI_COMMAND, &cmd);
		pci_write_config_word(priv->pdev, PCI_COMMAND,
				      cmd | PCI_COMMAND_INVALIDATE);

		/* Tell the world about it */
		ata_dev_info(dev, "K2/Shasta alignment limits applied\n");
	}

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int pata_macio_do_suspend(struct pata_macio_priv *priv, pm_message_t mesg)
{
	int rc;

	/* First, core libata suspend to do most of the work */
	rc = ata_host_suspend(priv->host, mesg);
	if (rc)
		return rc;

	/* Restore to default timings */
	pata_macio_default_timings(priv);

	/* Mask interrupt. Not strictly necessary but old driver did
	 * it and I'd rather not change that here */
	disable_irq(priv->irq);

	/* The media bay will handle itself just fine */
	if (priv->mediabay)
		return 0;

	/* Kauai has bus control FCRs directly here */
	if (priv->kauai_fcr) {
		u32 fcr = readl(priv->kauai_fcr);
		fcr &= ~(KAUAI_FCR_UATA_RESET_N | KAUAI_FCR_UATA_ENABLE);
		writel(fcr, priv->kauai_fcr);
	}

	/* For PCI, save state and disable DMA. No need to call
	 * pci_set_power_state(), the HW doesn't do D states that
	 * way, the platform code will take care of suspending the
	 * ASIC properly
	 */
	if (priv->pdev) {
		pci_save_state(priv->pdev);
		pci_disable_device(priv->pdev);
	}

	/* Disable the bus on older machines and the cell on kauai */
	ppc_md.feature_call(PMAC_FTR_IDE_ENABLE, priv->node,
			    priv->aapl_bus_id, 0);

	return 0;
}

static int pata_macio_do_resume(struct pata_macio_priv *priv)
{
	/* Reset and re-enable the HW */
	pata_macio_reset_hw(priv, 1);

	/* Sanitize drive timings */
	pata_macio_apply_timings(priv->host->ports[0], 0);

	/* We want our IRQ back ! */
	enable_irq(priv->irq);

	/* Let the libata core take it from there */
	ata_host_resume(priv->host);

	return 0;
}
#endif /* CONFIG_PM_SLEEP */

static struct scsi_host_template pata_macio_sht = {
	ATA_BASE_SHT(DRV_NAME),
	.sg_tablesize		= MAX_DCMDS,
	/* We may not need that strict one */
	.dma_boundary		= ATA_DMA_BOUNDARY,
	.slave_configure	= pata_macio_slave_config,
};

static struct ata_port_operations pata_macio_ops = {
	.inherits		= &ata_bmdma_port_ops,

	.freeze			= pata_macio_freeze,
	.set_piomode		= pata_macio_set_timings,
	.set_dmamode		= pata_macio_set_timings,
	.cable_detect		= pata_macio_cable_detect,
	.sff_dev_select		= pata_macio_dev_select,
	.qc_prep		= pata_macio_qc_prep,
	.bmdma_setup		= pata_macio_bmdma_setup,
	.bmdma_start		= pata_macio_bmdma_start,
	.bmdma_stop		= pata_macio_bmdma_stop,
	.bmdma_status		= pata_macio_bmdma_status,
	.port_start		= pata_macio_port_start,
	.sff_irq_clear		= pata_macio_irq_clear,
};

static void pata_macio_invariants(struct pata_macio_priv *priv)
{
	const int *bidp;

	/* Identify the type of controller */
	if (of_device_is_compatible(priv->node, "shasta-ata")) {
		priv->kind = controller_sh_ata6;
	        priv->timings = pata_macio_shasta_timings;
	} else if (of_device_is_compatible(priv->node, "kauai-ata")) {
		priv->kind = controller_un_ata6;
	        priv->timings = pata_macio_kauai_timings;
	} else if (of_device_is_compatible(priv->node, "K2-UATA")) {
		priv->kind = controller_k2_ata6;
	        priv->timings = pata_macio_kauai_timings;
	} else if (of_device_is_compatible(priv->node, "keylargo-ata")) {
		if (strcmp(priv->node->name, "ata-4") == 0) {
			priv->kind = controller_kl_ata4;
			priv->timings = pata_macio_kl66_timings;
		} else {
			priv->kind = controller_kl_ata3;
			priv->timings = pata_macio_kl33_timings;
		}
	} else if (of_device_is_compatible(priv->node, "heathrow-ata")) {
		priv->kind = controller_heathrow;
		priv->timings = pata_macio_heathrow_timings;
	} else {
		priv->kind = controller_ohare;
		priv->timings = pata_macio_ohare_timings;
	}

	/* XXX FIXME --- setup priv->mediabay here */

	/* Get Apple bus ID (for clock and ASIC control) */
	bidp = of_get_property(priv->node, "AAPL,bus-id", NULL);
	priv->aapl_bus_id =  bidp ? *bidp : 0;

	/* Fixup missing Apple bus ID in case of media-bay */
	if (priv->mediabay && bidp == 0)
		priv->aapl_bus_id = 1;
}

static void pata_macio_setup_ios(struct ata_ioports *ioaddr,
				 void __iomem * base, void __iomem * dma)
{
	/* cmd_addr is the base of regs for that port */
	ioaddr->cmd_addr	= base;

	/* taskfile registers */
	ioaddr->data_addr	= base + (ATA_REG_DATA    << 4);
	ioaddr->error_addr	= base + (ATA_REG_ERR     << 4);
	ioaddr->feature_addr	= base + (ATA_REG_FEATURE << 4);
	ioaddr->nsect_addr	= base + (ATA_REG_NSECT   << 4);
	ioaddr->lbal_addr	= base + (ATA_REG_LBAL    << 4);
	ioaddr->lbam_addr	= base + (ATA_REG_LBAM    << 4);
	ioaddr->lbah_addr	= base + (ATA_REG_LBAH    << 4);
	ioaddr->device_addr	= base + (ATA_REG_DEVICE  << 4);
	ioaddr->status_addr	= base + (ATA_REG_STATUS  << 4);
	ioaddr->command_addr	= base + (ATA_REG_CMD     << 4);
	ioaddr->altstatus_addr	= base + 0x160;
	ioaddr->ctl_addr	= base + 0x160;
	ioaddr->bmdma_addr	= dma;
}

static void pmac_macio_calc_timing_masks(struct pata_macio_priv *priv,
					 struct ata_port_info *pinfo)
{
	int i = 0;

	pinfo->pio_mask		= 0;
	pinfo->mwdma_mask	= 0;
	pinfo->udma_mask	= 0;

	while (priv->timings[i].mode > 0) {
		unsigned int mask = 1U << (priv->timings[i].mode & 0x0f);
		switch(priv->timings[i].mode & 0xf0) {
		case 0x00: /* PIO */
			pinfo->pio_mask |= (mask >> 8);
			break;
		case 0x20: /* MWDMA */
			pinfo->mwdma_mask |= mask;
			break;
		case 0x40: /* UDMA */
			pinfo->udma_mask |= mask;
			break;
		}
		i++;
	}
	dev_dbg(priv->dev, "Supported masks: PIO=%lx, MWDMA=%lx, UDMA=%lx\n",
		pinfo->pio_mask, pinfo->mwdma_mask, pinfo->udma_mask);
}

static int pata_macio_common_init(struct pata_macio_priv *priv,
				  resource_size_t tfregs,
				  resource_size_t dmaregs,
				  resource_size_t fcregs,
				  unsigned long irq)
{
	struct ata_port_info		pinfo;
	const struct ata_port_info	*ppi[] = { &pinfo, NULL };
	void __iomem			*dma_regs = NULL;

	/* Fill up privates with various invariants collected from the
	 * device-tree
	 */
	pata_macio_invariants(priv);

	/* Make sure we have sane initial timings in the cache */
	pata_macio_default_timings(priv);

	/* Not sure what the real max is but we know it's less than 64K, let's
	 * use 64K minus 256
	 */
	dma_set_max_seg_size(priv->dev, MAX_DBDMA_SEG);

	/* Allocate libata host for 1 port */
	memset(&pinfo, 0, sizeof(struct ata_port_info));
	pmac_macio_calc_timing_masks(priv, &pinfo);
	pinfo.flags		= ATA_FLAG_SLAVE_POSS;
	pinfo.port_ops		= &pata_macio_ops;
	pinfo.private_data	= priv;

	priv->host = ata_host_alloc_pinfo(priv->dev, ppi, 1);
	if (priv->host == NULL) {
		dev_err(priv->dev, "Failed to allocate ATA port structure\n");
		return -ENOMEM;
	}

	/* Setup the private data in host too */
	priv->host->private_data = priv;

	/* Map base registers */
	priv->tfregs = devm_ioremap(priv->dev, tfregs, 0x100);
	if (priv->tfregs == NULL) {
		dev_err(priv->dev, "Failed to map ATA ports\n");
		return -ENOMEM;
	}
	priv->host->iomap = &priv->tfregs;

	/* Map DMA regs */
	if (dmaregs != 0) {
		dma_regs = devm_ioremap(priv->dev, dmaregs,
					sizeof(struct dbdma_regs));
		if (dma_regs == NULL)
			dev_warn(priv->dev, "Failed to map ATA DMA registers\n");
	}

	/* If chip has local feature control, map those regs too */
	if (fcregs != 0) {
		priv->kauai_fcr = devm_ioremap(priv->dev, fcregs, 4);
		if (priv->kauai_fcr == NULL) {
			dev_err(priv->dev, "Failed to map ATA FCR register\n");
			return -ENOMEM;
		}
	}

	/* Setup port data structure */
	pata_macio_setup_ios(&priv->host->ports[0]->ioaddr,
			     priv->tfregs, dma_regs);
	priv->host->ports[0]->private_data = priv;

	/* hard-reset the controller */
	pata_macio_reset_hw(priv, 0);
	pata_macio_apply_timings(priv->host->ports[0], 0);

	/* Enable bus master if necessary */
	if (priv->pdev && dma_regs)
		pci_set_master(priv->pdev);

	dev_info(priv->dev, "Activating pata-macio chipset %s, Apple bus ID %d\n",
		 macio_ata_names[priv->kind], priv->aapl_bus_id);

	/* Start it up */
	priv->irq = irq;
	return ata_host_activate(priv->host, irq, ata_bmdma_interrupt, 0,
				 &pata_macio_sht);
}

static int pata_macio_attach(struct macio_dev *mdev,
			     const struct of_device_id *match)
{
	struct pata_macio_priv	*priv;
	resource_size_t		tfregs, dmaregs = 0;
	unsigned long		irq;
	int			rc;

	/* Check for broken device-trees */
	if (macio_resource_count(mdev) == 0) {
		dev_err(&mdev->ofdev.dev,
			"No addresses for controller\n");
		return -ENXIO;
	}

	/* Enable managed resources */
	macio_enable_devres(mdev);

	/* Allocate and init private data structure */
	priv = devm_kzalloc(&mdev->ofdev.dev,
			    sizeof(struct pata_macio_priv), GFP_KERNEL);
	if (priv == NULL) {
		dev_err(&mdev->ofdev.dev,
			"Failed to allocate private memory\n");
		return -ENOMEM;
	}
	priv->node = of_node_get(mdev->ofdev.dev.of_node);
	priv->mdev = mdev;
	priv->dev = &mdev->ofdev.dev;

	/* Request memory resource for taskfile registers */
	if (macio_request_resource(mdev, 0, "pata-macio")) {
		dev_err(&mdev->ofdev.dev,
			"Cannot obtain taskfile resource\n");
		return -EBUSY;
	}
	tfregs = macio_resource_start(mdev, 0);

	/* Request resources for DMA registers if any */
	if (macio_resource_count(mdev) >= 2) {
		if (macio_request_resource(mdev, 1, "pata-macio-dma"))
			dev_err(&mdev->ofdev.dev,
				"Cannot obtain DMA resource\n");
		else
			dmaregs = macio_resource_start(mdev, 1);
	}

	/*
	 * Fixup missing IRQ for some old implementations with broken
	 * device-trees.
	 *
	 * This is a bit bogus, it should be fixed in the device-tree itself,
	 * via the existing macio fixups, based on the type of interrupt
	 * controller in the machine. However, I have no test HW for this case,
	 * and this trick works well enough on those old machines...
	 */
	if (macio_irq_count(mdev) == 0) {
		dev_warn(&mdev->ofdev.dev,
			 "No interrupts for controller, using 13\n");
		irq = irq_create_mapping(NULL, 13);
	} else
		irq = macio_irq(mdev, 0);

	/* Prevvent media bay callbacks until fully registered */
	lock_media_bay(priv->mdev->media_bay);

	/* Get register addresses and call common initialization */
	rc = pata_macio_common_init(priv,
				    tfregs,		/* Taskfile regs */
				    dmaregs,		/* DBDMA regs */
				    0,			/* Feature control */
				    irq);
	unlock_media_bay(priv->mdev->media_bay);

	return rc;
}

static int pata_macio_detach(struct macio_dev *mdev)
{
	struct ata_host *host = macio_get_drvdata(mdev);
	struct pata_macio_priv *priv = host->private_data;

	lock_media_bay(priv->mdev->media_bay);

	/* Make sure the mediabay callback doesn't try to access
	 * dead stuff
	 */
	priv->host->private_data = NULL;

	ata_host_detach(host);

	unlock_media_bay(priv->mdev->media_bay);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int pata_macio_suspend(struct macio_dev *mdev, pm_message_t mesg)
{
	struct ata_host *host = macio_get_drvdata(mdev);

	return pata_macio_do_suspend(host->private_data, mesg);
}

static int pata_macio_resume(struct macio_dev *mdev)
{
	struct ata_host *host = macio_get_drvdata(mdev);

	return pata_macio_do_resume(host->private_data);
}
#endif /* CONFIG_PM_SLEEP */

#ifdef CONFIG_PMAC_MEDIABAY
static void pata_macio_mb_event(struct macio_dev* mdev, int mb_state)
{
	struct ata_host *host = macio_get_drvdata(mdev);
	struct ata_port *ap;
	struct ata_eh_info *ehi;
	struct ata_device *dev;
	unsigned long flags;

	if (!host || !host->private_data)
		return;
	ap = host->ports[0];
	spin_lock_irqsave(ap->lock, flags);
	ehi = &ap->link.eh_info;
	if (mb_state == MB_CD) {
		ata_ehi_push_desc(ehi, "mediabay plug");
		ata_ehi_hotplugged(ehi);
		ata_port_freeze(ap);
	} else {
		ata_ehi_push_desc(ehi, "mediabay unplug");
		ata_for_each_dev(dev, &ap->link, ALL)
			dev->flags |= ATA_DFLAG_DETACH;
		ata_port_abort(ap);
	}
	spin_unlock_irqrestore(ap->lock, flags);

}
#endif /* CONFIG_PMAC_MEDIABAY */


static int pata_macio_pci_attach(struct pci_dev *pdev,
				 const struct pci_device_id *id)
{
	struct pata_macio_priv	*priv;
	struct device_node	*np;
	resource_size_t		rbase;

	/* We cannot use a MacIO controller without its OF device node */
	np = pci_device_to_OF_node(pdev);
	if (np == NULL) {
		dev_err(&pdev->dev,
			"Cannot find OF device node for controller\n");
		return -ENODEV;
	}

	/* Check that it can be enabled */
	if (pcim_enable_device(pdev)) {
		dev_err(&pdev->dev,
			"Cannot enable controller PCI device\n");
		return -ENXIO;
	}

	/* Allocate and init private data structure */
	priv = devm_kzalloc(&pdev->dev,
			    sizeof(struct pata_macio_priv), GFP_KERNEL);
	if (priv == NULL) {
		dev_err(&pdev->dev,
			"Failed to allocate private memory\n");
		return -ENOMEM;
	}
	priv->node = of_node_get(np);
	priv->pdev = pdev;
	priv->dev = &pdev->dev;

	/* Get MMIO regions */
	if (pci_request_regions(pdev, "pata-macio")) {
		dev_err(&pdev->dev,
			"Cannot obtain PCI resources\n");
		return -EBUSY;
	}

	/* Get register addresses and call common initialization */
	rbase = pci_resource_start(pdev, 0);
	if (pata_macio_common_init(priv,
				   rbase + 0x2000,	/* Taskfile regs */
				   rbase + 0x1000,	/* DBDMA regs */
				   rbase,		/* Feature control */
				   pdev->irq))
		return -ENXIO;

	return 0;
}

static void pata_macio_pci_detach(struct pci_dev *pdev)
{
	struct ata_host *host = pci_get_drvdata(pdev);

	ata_host_detach(host);
}

#ifdef CONFIG_PM_SLEEP
static int pata_macio_pci_suspend(struct pci_dev *pdev, pm_message_t mesg)
{
	struct ata_host *host = pci_get_drvdata(pdev);

	return pata_macio_do_suspend(host->private_data, mesg);
}

static int pata_macio_pci_resume(struct pci_dev *pdev)
{
	struct ata_host *host = pci_get_drvdata(pdev);

	return pata_macio_do_resume(host->private_data);
}
#endif /* CONFIG_PM_SLEEP */

static struct of_device_id pata_macio_match[] =
{
	{
	.name 		= "IDE",
	},
	{
	.name 		= "ATA",
	},
	{
	.type		= "ide",
	},
	{
	.type		= "ata",
	},
	{},
};

static struct macio_driver pata_macio_driver =
{
	.driver = {
		.name 		= "pata-macio",
		.owner		= THIS_MODULE,
		.of_match_table	= pata_macio_match,
	},
	.probe		= pata_macio_attach,
	.remove		= pata_macio_detach,
#ifdef CONFIG_PM_SLEEP
	.suspend	= pata_macio_suspend,
	.resume		= pata_macio_resume,
#endif
#ifdef CONFIG_PMAC_MEDIABAY
	.mediabay_event	= pata_macio_mb_event,
#endif
};

static const struct pci_device_id pata_macio_pci_match[] = {
	{ PCI_VDEVICE(APPLE, PCI_DEVICE_ID_APPLE_UNI_N_ATA),	0 },
	{ PCI_VDEVICE(APPLE, PCI_DEVICE_ID_APPLE_IPID_ATA100),	0 },
	{ PCI_VDEVICE(APPLE, PCI_DEVICE_ID_APPLE_K2_ATA100),	0 },
	{ PCI_VDEVICE(APPLE, PCI_DEVICE_ID_APPLE_SH_ATA),	0 },
	{ PCI_VDEVICE(APPLE, PCI_DEVICE_ID_APPLE_IPID2_ATA),	0 },
	{},
};

static struct pci_driver pata_macio_pci_driver = {
	.name		= "pata-pci-macio",
	.id_table	= pata_macio_pci_match,
	.probe		= pata_macio_pci_attach,
	.remove		= pata_macio_pci_detach,
#ifdef CONFIG_PM_SLEEP
	.suspend	= pata_macio_pci_suspend,
	.resume		= pata_macio_pci_resume,
#endif
	.driver = {
		.owner		= THIS_MODULE,
	},
};
MODULE_DEVICE_TABLE(pci, pata_macio_pci_match);


static int __init pata_macio_init(void)
{
	int rc;

	if (!machine_is(powermac))
		return -ENODEV;

	rc = pci_register_driver(&pata_macio_pci_driver);
	if (rc)
		return rc;
	rc = macio_register_driver(&pata_macio_driver);
	if (rc) {
		pci_unregister_driver(&pata_macio_pci_driver);
		return rc;
	}
	return 0;
}

static void __exit pata_macio_exit(void)
{
	macio_unregister_driver(&pata_macio_driver);
	pci_unregister_driver(&pata_macio_pci_driver);
}

module_init(pata_macio_init);
module_exit(pata_macio_exit);

MODULE_AUTHOR("Benjamin Herrenschmidt");
MODULE_DESCRIPTION("Apple MacIO PATA driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);