summaryrefslogtreecommitdiffstats
path: root/drivers/ide/ide-iops.c
blob: 26b58d15c4e6b9f86fecca3eed91aae4056a0556 (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
/*
 *  Copyright (C) 2000-2002	Andre Hedrick <andre@linux-ide.org>
 *  Copyright (C) 2003		Red Hat
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/blkpg.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/ide.h>
#include <linux/bitops.h>
#include <linux/nmi.h>

#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/io.h>

/*
 *	Conventional PIO operations for ATA devices
 */

static u8 ide_inb (unsigned long port)
{
	return (u8) inb(port);
}

static void ide_outb (u8 val, unsigned long port)
{
	outb(val, port);
}

/*
 *	MMIO operations, typically used for SATA controllers
 */

static u8 ide_mm_inb (unsigned long port)
{
	return (u8) readb((void __iomem *) port);
}

static void ide_mm_outb (u8 value, unsigned long port)
{
	writeb(value, (void __iomem *) port);
}

void SELECT_DRIVE (ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	const struct ide_port_ops *port_ops = hwif->port_ops;
	ide_task_t task;

	if (port_ops && port_ops->selectproc)
		port_ops->selectproc(drive);

	memset(&task, 0, sizeof(task));
	task.tf_flags = IDE_TFLAG_OUT_DEVICE;

	drive->hwif->tp_ops->tf_load(drive, &task);
}

void SELECT_MASK(ide_drive_t *drive, int mask)
{
	const struct ide_port_ops *port_ops = drive->hwif->port_ops;

	if (port_ops && port_ops->maskproc)
		port_ops->maskproc(drive, mask);
}

void ide_exec_command(ide_hwif_t *hwif, u8 cmd)
{
	if (hwif->host_flags & IDE_HFLAG_MMIO)
		writeb(cmd, (void __iomem *)hwif->io_ports.command_addr);
	else
		outb(cmd, hwif->io_ports.command_addr);
}
EXPORT_SYMBOL_GPL(ide_exec_command);

u8 ide_read_status(ide_hwif_t *hwif)
{
	if (hwif->host_flags & IDE_HFLAG_MMIO)
		return readb((void __iomem *)hwif->io_ports.status_addr);
	else
		return inb(hwif->io_ports.status_addr);
}
EXPORT_SYMBOL_GPL(ide_read_status);

u8 ide_read_altstatus(ide_hwif_t *hwif)
{
	if (hwif->host_flags & IDE_HFLAG_MMIO)
		return readb((void __iomem *)hwif->io_ports.ctl_addr);
	else
		return inb(hwif->io_ports.ctl_addr);
}
EXPORT_SYMBOL_GPL(ide_read_altstatus);

u8 ide_read_sff_dma_status(ide_hwif_t *hwif)
{
	if (hwif->host_flags & IDE_HFLAG_MMIO)
		return readb((void __iomem *)(hwif->dma_base + ATA_DMA_STATUS));
	else
		return inb(hwif->dma_base + ATA_DMA_STATUS);
}
EXPORT_SYMBOL_GPL(ide_read_sff_dma_status);

void ide_set_irq(ide_hwif_t *hwif, int on)
{
	u8 ctl = ATA_DEVCTL_OBS;

	if (on == 4) { /* hack for SRST */
		ctl |= 4;
		on &= ~4;
	}

	ctl |= on ? 0 : 2;

	if (hwif->host_flags & IDE_HFLAG_MMIO)
		writeb(ctl, (void __iomem *)hwif->io_ports.ctl_addr);
	else
		outb(ctl, hwif->io_ports.ctl_addr);
}
EXPORT_SYMBOL_GPL(ide_set_irq);

void ide_tf_load(ide_drive_t *drive, ide_task_t *task)
{
	ide_hwif_t *hwif = drive->hwif;
	struct ide_io_ports *io_ports = &hwif->io_ports;
	struct ide_taskfile *tf = &task->tf;
	void (*tf_outb)(u8 addr, unsigned long port);
	u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
	u8 HIHI = (task->tf_flags & IDE_TFLAG_LBA48) ? 0xE0 : 0xEF;

	if (mmio)
		tf_outb = ide_mm_outb;
	else
		tf_outb = ide_outb;

	if (task->tf_flags & IDE_TFLAG_FLAGGED)
		HIHI = 0xFF;

	if (task->tf_flags & IDE_TFLAG_OUT_DATA) {
		u16 data = (tf->hob_data << 8) | tf->data;

		if (mmio)
			writew(data, (void __iomem *)io_ports->data_addr);
		else
			outw(data, io_ports->data_addr);
	}

	if (task->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
		tf_outb(tf->hob_feature, io_ports->feature_addr);
	if (task->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
		tf_outb(tf->hob_nsect, io_ports->nsect_addr);
	if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
		tf_outb(tf->hob_lbal, io_ports->lbal_addr);
	if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
		tf_outb(tf->hob_lbam, io_ports->lbam_addr);
	if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
		tf_outb(tf->hob_lbah, io_ports->lbah_addr);

	if (task->tf_flags & IDE_TFLAG_OUT_FEATURE)
		tf_outb(tf->feature, io_ports->feature_addr);
	if (task->tf_flags & IDE_TFLAG_OUT_NSECT)
		tf_outb(tf->nsect, io_ports->nsect_addr);
	if (task->tf_flags & IDE_TFLAG_OUT_LBAL)
		tf_outb(tf->lbal, io_ports->lbal_addr);
	if (task->tf_flags & IDE_TFLAG_OUT_LBAM)
		tf_outb(tf->lbam, io_ports->lbam_addr);
	if (task->tf_flags & IDE_TFLAG_OUT_LBAH)
		tf_outb(tf->lbah, io_ports->lbah_addr);

	if (task->tf_flags & IDE_TFLAG_OUT_DEVICE)
		tf_outb((tf->device & HIHI) | drive->select,
			 io_ports->device_addr);
}
EXPORT_SYMBOL_GPL(ide_tf_load);

void ide_tf_read(ide_drive_t *drive, ide_task_t *task)
{
	ide_hwif_t *hwif = drive->hwif;
	struct ide_io_ports *io_ports = &hwif->io_ports;
	struct ide_taskfile *tf = &task->tf;
	void (*tf_outb)(u8 addr, unsigned long port);
	u8 (*tf_inb)(unsigned long port);
	u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;

	if (mmio) {
		tf_outb = ide_mm_outb;
		tf_inb  = ide_mm_inb;
	} else {
		tf_outb = ide_outb;
		tf_inb  = ide_inb;
	}

	if (task->tf_flags & IDE_TFLAG_IN_DATA) {
		u16 data;

		if (mmio)
			data = readw((void __iomem *)io_ports->data_addr);
		else
			data = inw(io_ports->data_addr);

		tf->data = data & 0xff;
		tf->hob_data = (data >> 8) & 0xff;
	}

	/* be sure we're looking at the low order bits */
	tf_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);

	if (task->tf_flags & IDE_TFLAG_IN_FEATURE)
		tf->feature = tf_inb(io_ports->feature_addr);
	if (task->tf_flags & IDE_TFLAG_IN_NSECT)
		tf->nsect  = tf_inb(io_ports->nsect_addr);
	if (task->tf_flags & IDE_TFLAG_IN_LBAL)
		tf->lbal   = tf_inb(io_ports->lbal_addr);
	if (task->tf_flags & IDE_TFLAG_IN_LBAM)
		tf->lbam   = tf_inb(io_ports->lbam_addr);
	if (task->tf_flags & IDE_TFLAG_IN_LBAH)
		tf->lbah   = tf_inb(io_ports->lbah_addr);
	if (task->tf_flags & IDE_TFLAG_IN_DEVICE)
		tf->device = tf_inb(io_ports->device_addr);

	if (task->tf_flags & IDE_TFLAG_LBA48) {
		tf_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);

		if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
			tf->hob_feature = tf_inb(io_ports->feature_addr);
		if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
			tf->hob_nsect   = tf_inb(io_ports->nsect_addr);
		if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
			tf->hob_lbal    = tf_inb(io_ports->lbal_addr);
		if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
			tf->hob_lbam    = tf_inb(io_ports->lbam_addr);
		if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
			tf->hob_lbah    = tf_inb(io_ports->lbah_addr);
	}
}
EXPORT_SYMBOL_GPL(ide_tf_read);

/*
 * Some localbus EIDE interfaces require a special access sequence
 * when using 32-bit I/O instructions to transfer data.  We call this
 * the "vlb_sync" sequence, which consists of three successive reads
 * of the sector count register location, with interrupts disabled
 * to ensure that the reads all happen together.
 */
static void ata_vlb_sync(unsigned long port)
{
	(void)inb(port);
	(void)inb(port);
	(void)inb(port);
}

/*
 * This is used for most PIO data transfers *from* the IDE interface
 *
 * These routines will round up any request for an odd number of bytes,
 * so if an odd len is specified, be sure that there's at least one
 * extra byte allocated for the buffer.
 */
void ide_input_data(ide_drive_t *drive, struct request *rq, void *buf,
		    unsigned int len)
{
	ide_hwif_t *hwif = drive->hwif;
	struct ide_io_ports *io_ports = &hwif->io_ports;
	unsigned long data_addr = io_ports->data_addr;
	u8 io_32bit = drive->io_32bit;
	u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;

	len++;

	if (io_32bit) {
		unsigned long uninitialized_var(flags);

		if ((io_32bit & 2) && !mmio) {
			local_irq_save(flags);
			ata_vlb_sync(io_ports->nsect_addr);
		}

		if (mmio)
			__ide_mm_insl((void __iomem *)data_addr, buf, len / 4);
		else
			insl(data_addr, buf, len / 4);

		if ((io_32bit & 2) && !mmio)
			local_irq_restore(flags);

		if ((len & 3) >= 2) {
			if (mmio)
				__ide_mm_insw((void __iomem *)data_addr,
						(u8 *)buf + (len & ~3), 1);
			else
				insw(data_addr, (u8 *)buf + (len & ~3), 1);
		}
	} else {
		if (mmio)
			__ide_mm_insw((void __iomem *)data_addr, buf, len / 2);
		else
			insw(data_addr, buf, len / 2);
	}
}
EXPORT_SYMBOL_GPL(ide_input_data);

/*
 * This is used for most PIO data transfers *to* the IDE interface
 */
void ide_output_data(ide_drive_t *drive, struct request *rq, void *buf,
		     unsigned int len)
{
	ide_hwif_t *hwif = drive->hwif;
	struct ide_io_ports *io_ports = &hwif->io_ports;
	unsigned long data_addr = io_ports->data_addr;
	u8 io_32bit = drive->io_32bit;
	u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;

	if (io_32bit) {
		unsigned long uninitialized_var(flags);

		if ((io_32bit & 2) && !mmio) {
			local_irq_save(flags);
			ata_vlb_sync(io_ports->nsect_addr);
		}

		if (mmio)
			__ide_mm_outsl((void __iomem *)data_addr, buf, len / 4);
		else
			outsl(data_addr, buf, len / 4);

		if ((io_32bit & 2) && !mmio)
			local_irq_restore(flags);

		if ((len & 3) >= 2) {
			if (mmio)
				__ide_mm_outsw((void __iomem *)data_addr,
						 (u8 *)buf + (len & ~3), 1);
			else
				outsw(data_addr, (u8 *)buf + (len & ~3), 1);
		}
	} else {
		if (mmio)
			__ide_mm_outsw((void __iomem *)data_addr, buf, len / 2);
		else
			outsw(data_addr, buf, len / 2);
	}
}
EXPORT_SYMBOL_GPL(ide_output_data);

u8 ide_read_error(ide_drive_t *drive)
{
	ide_task_t task;

	memset(&task, 0, sizeof(task));
	task.tf_flags = IDE_TFLAG_IN_FEATURE;

	drive->hwif->tp_ops->tf_read(drive, &task);

	return task.tf.error;
}
EXPORT_SYMBOL_GPL(ide_read_error);

void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason)
{
	ide_task_t task;

	memset(&task, 0, sizeof(task));
	task.tf_flags = IDE_TFLAG_IN_LBAH | IDE_TFLAG_IN_LBAM |
			IDE_TFLAG_IN_NSECT;

	drive->hwif->tp_ops->tf_read(drive, &task);

	*bcount = (task.tf.lbah << 8) | task.tf.lbam;
	*ireason = task.tf.nsect & 3;
}
EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason);

const struct ide_tp_ops default_tp_ops = {
	.exec_command		= ide_exec_command,
	.read_status		= ide_read_status,
	.read_altstatus		= ide_read_altstatus,
	.read_sff_dma_status	= ide_read_sff_dma_status,

	.set_irq		= ide_set_irq,

	.tf_load		= ide_tf_load,
	.tf_read		= ide_tf_read,

	.input_data		= ide_input_data,
	.output_data		= ide_output_data,
};

void ide_fix_driveid(u16 *id)
{
#ifndef __LITTLE_ENDIAN
# ifdef __BIG_ENDIAN
	int i;

	for (i = 0; i < 256; i++)
		id[i] = __le16_to_cpu(id[i]);
# else
#  error "Please fix <asm/byteorder.h>"
# endif
#endif
}

/*
 * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
 * removing leading/trailing blanks and compressing internal blanks.
 * It is primarily used to tidy up the model name/number fields as
 * returned by the ATA_CMD_ID_ATA[PI] commands.
 */

void ide_fixstring (u8 *s, const int bytecount, const int byteswap)
{
	u8 *p, *end = &s[bytecount & ~1]; /* bytecount must be even */

	if (byteswap) {
		/* convert from big-endian to host byte order */
		for (p = s ; p != end ; p += 2)
			be16_to_cpus((u16 *) p);
	}

	/* strip leading blanks */
	p = s;
	while (s != end && *s == ' ')
		++s;
	/* compress internal blanks and strip trailing blanks */
	while (s != end && *s) {
		if (*s++ != ' ' || (s != end && *s && *s != ' '))
			*p++ = *(s-1);
	}
	/* wipe out trailing garbage */
	while (p != end)
		*p++ = '\0';
}

EXPORT_SYMBOL(ide_fixstring);

/*
 * Needed for PCI irq sharing
 */
int drive_is_ready (ide_drive_t *drive)
{
	ide_hwif_t *hwif	= drive->hwif;
	u8 stat			= 0;

	if (drive->waiting_for_dma)
		return hwif->dma_ops->dma_test_irq(drive);

	/*
	 * We do a passive status test under shared PCI interrupts on
	 * cards that truly share the ATA side interrupt, but may also share
	 * an interrupt with another pci card/device.  We make no assumptions
	 * about possible isa-pnp and pci-pnp issues yet.
	 */
	if (hwif->io_ports.ctl_addr &&
	    (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0)
		stat = hwif->tp_ops->read_altstatus(hwif);
	else
		/* Note: this may clear a pending IRQ!! */
		stat = hwif->tp_ops->read_status(hwif);

	if (stat & ATA_BUSY)
		/* drive busy:  definitely not interrupting */
		return 0;

	/* drive ready: *might* be interrupting */
	return 1;
}

EXPORT_SYMBOL(drive_is_ready);

/*
 * This routine busy-waits for the drive status to be not "busy".
 * It then checks the status for all of the "good" bits and none
 * of the "bad" bits, and if all is okay it returns 0.  All other
 * cases return error -- caller may then invoke ide_error().
 *
 * This routine should get fixed to not hog the cpu during extra long waits..
 * That could be done by busy-waiting for the first jiffy or two, and then
 * setting a timer to wake up at half second intervals thereafter,
 * until timeout is achieved, before timing out.
 */
static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout, u8 *rstat)
{
	ide_hwif_t *hwif = drive->hwif;
	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
	unsigned long flags;
	int i;
	u8 stat;

	udelay(1);	/* spec allows drive 400ns to assert "BUSY" */
	stat = tp_ops->read_status(hwif);

	if (stat & ATA_BUSY) {
		local_irq_save(flags);
		local_irq_enable_in_hardirq();
		timeout += jiffies;
		while ((stat = tp_ops->read_status(hwif)) & ATA_BUSY) {
			if (time_after(jiffies, timeout)) {
				/*
				 * One last read after the timeout in case
				 * heavy interrupt load made us not make any
				 * progress during the timeout..
				 */
				stat = tp_ops->read_status(hwif);
				if ((stat & ATA_BUSY) == 0)
					break;

				local_irq_restore(flags);
				*rstat = stat;
				return -EBUSY;
			}
		}
		local_irq_restore(flags);
	}
	/*
	 * Allow status to settle, then read it again.
	 * A few rare drives vastly violate the 400ns spec here,
	 * so we'll wait up to 10usec for a "good" status
	 * rather than expensively fail things immediately.
	 * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
	 */
	for (i = 0; i < 10; i++) {
		udelay(1);
		stat = tp_ops->read_status(hwif);

		if (OK_STAT(stat, good, bad)) {
			*rstat = stat;
			return 0;
		}
	}
	*rstat = stat;
	return -EFAULT;
}

/*
 * In case of error returns error value after doing "*startstop = ide_error()".
 * The caller should return the updated value of "startstop" in this case,
 * "startstop" is unchanged when the function returns 0.
 */
int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout)
{
	int err;
	u8 stat;

	/* bail early if we've exceeded max_failures */
	if (drive->max_failures && (drive->failures > drive->max_failures)) {
		*startstop = ide_stopped;
		return 1;
	}

	err = __ide_wait_stat(drive, good, bad, timeout, &stat);

	if (err) {
		char *s = (err == -EBUSY) ? "status timeout" : "status error";
		*startstop = ide_error(drive, s, stat);
	}

	return err;
}

EXPORT_SYMBOL(ide_wait_stat);

/**
 *	ide_in_drive_list	-	look for drive in black/white list
 *	@id: drive identifier
 *	@table: list to inspect
 *
 *	Look for a drive in the blacklist and the whitelist tables
 *	Returns 1 if the drive is found in the table.
 */

int ide_in_drive_list(u16 *id, const struct drive_list_entry *table)
{
	for ( ; table->id_model; table++)
		if ((!strcmp(table->id_model, (char *)&id[ATA_ID_PROD])) &&
		    (!table->id_firmware ||
		     strstr((char *)&id[ATA_ID_FW_REV], table->id_firmware)))
			return 1;
	return 0;
}

EXPORT_SYMBOL_GPL(ide_in_drive_list);

/*
 * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
 * We list them here and depend on the device side cable detection for them.
 *
 * Some optical devices with the buggy firmwares have the same problem.
 */
static const struct drive_list_entry ivb_list[] = {
	{ "QUANTUM FIREBALLlct10 05"	, "A03.0900"	},
	{ "TSSTcorp CDDVDW SH-S202J"	, "SB00"	},
	{ "TSSTcorp CDDVDW SH-S202J"	, "SB01"	},
	{ "TSSTcorp CDDVDW SH-S202N"	, "SB00"	},
	{ "TSSTcorp CDDVDW SH-S202N"	, "SB01"	},
	{ "TSSTcorp CDDVDW SH-S202H"	, "SB00"	},
	{ "TSSTcorp CDDVDW SH-S202H"	, "SB01"	},
	{ "SAMSUNG SP0822N"		, "WA100-10"	},
	{ NULL				, NULL		}
};

/*
 *  All hosts that use the 80c ribbon must use!
 *  The name is derived from upper byte of word 93 and the 80c ribbon.
 */
u8 eighty_ninty_three (ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	u16 *id = drive->id;
	int ivb = ide_in_drive_list(id, ivb_list);

	if (hwif->cbl == ATA_CBL_PATA40_SHORT)
		return 1;

	if (ivb)
		printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
				  drive->name);

	if (ata_id_is_sata(id) && !ivb)
		return 1;

	if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
		goto no_80w;

	/*
	 * FIXME:
	 * - change master/slave IDENTIFY order
	 * - force bit13 (80c cable present) check also for !ivb devices
	 *   (unless the slave device is pre-ATA3)
	 */
	if ((id[ATA_ID_HW_CONFIG] & 0x4000) ||
	    (ivb && (id[ATA_ID_HW_CONFIG] & 0x2000)))
		return 1;

no_80w:
	if (drive->dev_flags & IDE_DFLAG_UDMA33_WARNED)
		return 0;

	printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
			    "limiting max speed to UDMA33\n",
			    drive->name,
			    hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");

	drive->dev_flags |= IDE_DFLAG_UDMA33_WARNED;

	return 0;
}

int ide_driveid_update(ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
	u16 *id;
	unsigned long flags;
	u8 stat;

	/*
	 * Re-read drive->id for possible DMA mode
	 * change (copied from ide-probe.c)
	 */

	SELECT_MASK(drive, 1);
	tp_ops->set_irq(hwif, 0);
	msleep(50);
	tp_ops->exec_command(hwif, ATA_CMD_ID_ATA);

	if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 1)) {
		SELECT_MASK(drive, 0);
		return 0;
	}

	msleep(50);	/* wait for IRQ and ATA_DRQ */
	stat = tp_ops->read_status(hwif);

	if (!OK_STAT(stat, ATA_DRQ, BAD_R_STAT)) {
		SELECT_MASK(drive, 0);
		printk("%s: CHECK for good STATUS\n", drive->name);
		return 0;
	}
	local_irq_save(flags);
	SELECT_MASK(drive, 0);
	id = kmalloc(SECTOR_SIZE, GFP_ATOMIC);
	if (!id) {
		local_irq_restore(flags);
		return 0;
	}
	tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
	(void)tp_ops->read_status(hwif);	/* clear drive IRQ */
	local_irq_enable();
	local_irq_restore(flags);
	ide_fix_driveid(id);

	drive->id[ATA_ID_UDMA_MODES]  = id[ATA_ID_UDMA_MODES];
	drive->id[ATA_ID_MWDMA_MODES] = id[ATA_ID_MWDMA_MODES];
	drive->id[ATA_ID_SWDMA_MODES] = id[ATA_ID_SWDMA_MODES];
	/* anything more ? */

	kfree(id);

	if ((drive->dev_flags & IDE_DFLAG_USING_DMA) && ide_id_dma_bug(drive))
		ide_dma_off(drive);

	return 1;
}

int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
{
	ide_hwif_t *hwif = drive->hwif;
	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
	u16 *id = drive->id, i;
	int error = 0;
	u8 stat;
	ide_task_t task;

#ifdef CONFIG_BLK_DEV_IDEDMA
	if (hwif->dma_ops)	/* check if host supports DMA */
		hwif->dma_ops->dma_host_set(drive, 0);
#endif

	/* Skip setting PIO flow-control modes on pre-EIDE drives */
	if ((speed & 0xf8) == XFER_PIO_0 && ata_id_has_iordy(drive->id) == 0)
		goto skip;

	/*
	 * Don't use ide_wait_cmd here - it will
	 * attempt to set_geometry and recalibrate,
	 * but for some reason these don't work at
	 * this point (lost interrupt).
	 */
        /*
         * Select the drive, and issue the SETFEATURES command
         */
	disable_irq_nosync(hwif->irq);
	
	/*
	 *	FIXME: we race against the running IRQ here if
	 *	this is called from non IRQ context. If we use
	 *	disable_irq() we hang on the error path. Work
	 *	is needed.
	 */
	 
	udelay(1);
	SELECT_DRIVE(drive);
	SELECT_MASK(drive, 1);
	udelay(1);
	tp_ops->set_irq(hwif, 0);

	memset(&task, 0, sizeof(task));
	task.tf_flags = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT;
	task.tf.feature = SETFEATURES_XFER;
	task.tf.nsect   = speed;

	tp_ops->tf_load(drive, &task);

	tp_ops->exec_command(hwif, ATA_CMD_SET_FEATURES);

	if (drive->quirk_list == 2)
		tp_ops->set_irq(hwif, 1);

	error = __ide_wait_stat(drive, drive->ready_stat,
				ATA_BUSY | ATA_DRQ | ATA_ERR,
				WAIT_CMD, &stat);

	SELECT_MASK(drive, 0);

	enable_irq(hwif->irq);

	if (error) {
		(void) ide_dump_status(drive, "set_drive_speed_status", stat);
		return error;
	}

	id[ATA_ID_UDMA_MODES]  &= ~0xFF00;
	id[ATA_ID_MWDMA_MODES] &= ~0x0F00;
	id[ATA_ID_SWDMA_MODES] &= ~0x0F00;

 skip:
#ifdef CONFIG_BLK_DEV_IDEDMA
	if (speed >= XFER_SW_DMA_0 && (drive->dev_flags & IDE_DFLAG_USING_DMA))
		hwif->dma_ops->dma_host_set(drive, 1);
	else if (hwif->dma_ops)	/* check if host supports DMA */
		ide_dma_off_quietly(drive);
#endif

	if (speed >= XFER_UDMA_0) {
		i = 1 << (speed - XFER_UDMA_0);
		id[ATA_ID_UDMA_MODES] |= (i << 8 | i);
	} else if (speed >= XFER_MW_DMA_0) {
		i = 1 << (speed - XFER_MW_DMA_0);
		id[ATA_ID_MWDMA_MODES] |= (i << 8 | i);
	} else if (speed >= XFER_SW_DMA_0) {
		i = 1 << (speed - XFER_SW_DMA_0);
		id[ATA_ID_SWDMA_MODES] |= (i << 8 | i);
	}

	if (!drive->init_speed)
		drive->init_speed = speed;
	drive->current_speed = speed;
	return error;
}

/*
 * This should get invoked any time we exit the driver to
 * wait for an interrupt response from a drive.  handler() points
 * at the appropriate code to handle the next interrupt, and a
 * timer is started to prevent us from waiting forever in case
 * something goes wrong (see the ide_timer_expiry() handler later on).
 *
 * See also ide_execute_command
 */
static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
		      unsigned int timeout, ide_expiry_t *expiry)
{
	ide_hwif_t *hwif = drive->hwif;

	BUG_ON(hwif->handler);
	hwif->handler		= handler;
	hwif->expiry		= expiry;
	hwif->timer.expires	= jiffies + timeout;
	hwif->req_gen_timer	= hwif->req_gen;
	add_timer(&hwif->timer);
}

void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
		      unsigned int timeout, ide_expiry_t *expiry)
{
	ide_hwif_t *hwif = drive->hwif;
	unsigned long flags;

	spin_lock_irqsave(&hwif->lock, flags);
	__ide_set_handler(drive, handler, timeout, expiry);
	spin_unlock_irqrestore(&hwif->lock, flags);
}

EXPORT_SYMBOL(ide_set_handler);
 
/**
 *	ide_execute_command	-	execute an IDE command
 *	@drive: IDE drive to issue the command against
 *	@command: command byte to write
 *	@handler: handler for next phase
 *	@timeout: timeout for command
 *	@expiry:  handler to run on timeout
 *
 *	Helper function to issue an IDE command. This handles the
 *	atomicity requirements, command timing and ensures that the 
 *	handler and IRQ setup do not race. All IDE command kick off
 *	should go via this function or do equivalent locking.
 */

void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler,
			 unsigned timeout, ide_expiry_t *expiry)
{
	ide_hwif_t *hwif = drive->hwif;
	unsigned long flags;

	spin_lock_irqsave(&hwif->lock, flags);
	__ide_set_handler(drive, handler, timeout, expiry);
	hwif->tp_ops->exec_command(hwif, cmd);
	/*
	 * Drive takes 400nS to respond, we must avoid the IRQ being
	 * serviced before that.
	 *
	 * FIXME: we could skip this delay with care on non shared devices
	 */
	ndelay(400);
	spin_unlock_irqrestore(&hwif->lock, flags);
}
EXPORT_SYMBOL(ide_execute_command);

void ide_execute_pkt_cmd(ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	unsigned long flags;

	spin_lock_irqsave(&hwif->lock, flags);
	hwif->tp_ops->exec_command(hwif, ATA_CMD_PACKET);
	ndelay(400);
	spin_unlock_irqrestore(&hwif->lock, flags);
}
EXPORT_SYMBOL_GPL(ide_execute_pkt_cmd);

static inline void ide_complete_drive_reset(ide_drive_t *drive, int err)
{
	struct request *rq = drive->hwif->rq;

	if (rq && blk_special_request(rq) && rq->cmd[0] == REQ_DRIVE_RESET)
		ide_end_request(drive, err ? err : 1, 0);
}

/* needed below */
static ide_startstop_t do_reset1 (ide_drive_t *, int);

/*
 * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 * during an atapi drive reset operation. If the drive has not yet responded,
 * and we have not yet hit our maximum waiting time, then the timer is restarted
 * for another 50ms.
 */
static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	u8 stat;

	SELECT_DRIVE(drive);
	udelay (10);
	stat = hwif->tp_ops->read_status(hwif);

	if (OK_STAT(stat, 0, ATA_BUSY))
		printk("%s: ATAPI reset complete\n", drive->name);
	else {
		if (time_before(jiffies, hwif->poll_timeout)) {
			ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
			/* continue polling */
			return ide_started;
		}
		/* end of polling */
		hwif->polling = 0;
		printk("%s: ATAPI reset timed-out, status=0x%02x\n",
				drive->name, stat);
		/* do it the old fashioned way */
		return do_reset1(drive, 1);
	}
	/* done polling */
	hwif->polling = 0;
	ide_complete_drive_reset(drive, 0);
	return ide_stopped;
}

static void ide_reset_report_error(ide_hwif_t *hwif, u8 err)
{
	static const char *err_master_vals[] =
		{ NULL, "passed", "formatter device error",
		  "sector buffer error", "ECC circuitry error",
		  "controlling MPU error" };

	u8 err_master = err & 0x7f;

	printk(KERN_ERR "%s: reset: master: ", hwif->name);
	if (err_master && err_master < 6)
		printk(KERN_CONT "%s", err_master_vals[err_master]);
	else
		printk(KERN_CONT "error (0x%02x?)", err);
	if (err & 0x80)
		printk(KERN_CONT "; slave: failed");
	printk(KERN_CONT "\n");
}

/*
 * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 * during an ide reset operation. If the drives have not yet responded,
 * and we have not yet hit our maximum waiting time, then the timer is restarted
 * for another 50ms.
 */
static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
{
	ide_hwif_t *hwif = drive->hwif;
	const struct ide_port_ops *port_ops = hwif->port_ops;
	u8 tmp;
	int err = 0;

	if (port_ops && port_ops->reset_poll) {
		err = port_ops->reset_poll(drive);
		if (err) {
			printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
				hwif->name, drive->name);
			goto out;
		}
	}

	tmp = hwif->tp_ops->read_status(hwif);

	if (!OK_STAT(tmp, 0, ATA_BUSY)) {
		if (time_before(jiffies, hwif->poll_timeout)) {
			ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
			/* continue polling */
			return ide_started;
		}
		printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
		drive->failures++;
		err = -EIO;
	} else  {
		tmp = ide_read_error(drive);

		if (tmp == 1) {
			printk(KERN_INFO "%s: reset: success\n", hwif->name);
			drive->failures = 0;
		} else {
			ide_reset_report_error(hwif, tmp);
			drive->failures++;
			err = -EIO;
		}
	}
out:
	hwif->polling = 0;	/* done polling */
	ide_complete_drive_reset(drive, err);
	return ide_stopped;
}

static void ide_disk_pre_reset(ide_drive_t *drive)
{
	int legacy = (drive->id[ATA_ID_CFS_ENABLE_2] & 0x0400) ? 0 : 1;

	drive->special.all = 0;
	drive->special.b.set_geometry = legacy;
	drive->special.b.recalibrate  = legacy;

	drive->mult_count = 0;
	drive->dev_flags &= ~IDE_DFLAG_PARKED;

	if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0 &&
	    (drive->dev_flags & IDE_DFLAG_USING_DMA) == 0)
		drive->mult_req = 0;

	if (drive->mult_req != drive->mult_count)
		drive->special.b.set_multmode = 1;
}

static void pre_reset(ide_drive_t *drive)
{
	const struct ide_port_ops *port_ops = drive->hwif->port_ops;

	if (drive->media == ide_disk)
		ide_disk_pre_reset(drive);
	else
		drive->dev_flags |= IDE_DFLAG_POST_RESET;

	if (drive->dev_flags & IDE_DFLAG_USING_DMA) {
		if (drive->crc_count)
			ide_check_dma_crc(drive);
		else
			ide_dma_off(drive);
	}

	if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0) {
		if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0) {
			drive->dev_flags &= ~IDE_DFLAG_UNMASK;
			drive->io_32bit = 0;
		}
		return;
	}

	if (port_ops && port_ops->pre_reset)
		port_ops->pre_reset(drive);

	if (drive->current_speed != 0xff)
		drive->desired_speed = drive->current_speed;
	drive->current_speed = 0xff;
}

/*
 * do_reset1() attempts to recover a confused drive by resetting it.
 * Unfortunately, resetting a disk drive actually resets all devices on
 * the same interface, so it can really be thought of as resetting the
 * interface rather than resetting the drive.
 *
 * ATAPI devices have their own reset mechanism which allows them to be
 * individually reset without clobbering other devices on the same interface.
 *
 * Unfortunately, the IDE interface does not generate an interrupt to let
 * us know when the reset operation has finished, so we must poll for this.
 * Equally poor, though, is the fact that this may a very long time to complete,
 * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
 * we set a timer to poll at 50ms intervals.
 */
static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
{
	ide_hwif_t *hwif = drive->hwif;
	struct ide_io_ports *io_ports = &hwif->io_ports;
	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
	const struct ide_port_ops *port_ops;
	unsigned long flags, timeout;
	unsigned int unit;
	DEFINE_WAIT(wait);

	spin_lock_irqsave(&hwif->lock, flags);

	/* We must not reset with running handlers */
	BUG_ON(hwif->handler != NULL);

	/* For an ATAPI device, first try an ATAPI SRST. */
	if (drive->media != ide_disk && !do_not_try_atapi) {
		pre_reset(drive);
		SELECT_DRIVE(drive);
		udelay (20);
		tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
		ndelay(400);
		hwif->poll_timeout = jiffies + WAIT_WORSTCASE;
		hwif->polling = 1;
		__ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
		spin_unlock_irqrestore(&hwif->lock, flags);
		return ide_started;
	}

	/* We must not disturb devices in the IDE_DFLAG_PARKED state. */
	do {
		unsigned long now;

		prepare_to_wait(&ide_park_wq, &wait, TASK_UNINTERRUPTIBLE);
		timeout = jiffies;
		for (unit = 0; unit < MAX_DRIVES; unit++) {
			ide_drive_t *tdrive = hwif->devices[unit];

			if (tdrive->dev_flags & IDE_DFLAG_PRESENT &&
			    tdrive->dev_flags & IDE_DFLAG_PARKED &&
			    time_after(tdrive->sleep, timeout))
				timeout = tdrive->sleep;
		}

		now = jiffies;
		if (time_before_eq(timeout, now))
			break;

		spin_unlock_irqrestore(&hwif->lock, flags);
		timeout = schedule_timeout_uninterruptible(timeout - now);
		spin_lock_irqsave(&hwif->lock, flags);
	} while (timeout);
	finish_wait(&ide_park_wq, &wait);

	/*
	 * First, reset any device state data we were maintaining
	 * for any of the drives on this interface.
	 */
	for (unit = 0; unit < MAX_DRIVES; ++unit)
		pre_reset(hwif->devices[unit]);

	if (io_ports->ctl_addr == 0) {
		spin_unlock_irqrestore(&hwif->lock, flags);
		ide_complete_drive_reset(drive, -ENXIO);
		return ide_stopped;
	}

	/*
	 * Note that we also set nIEN while resetting the device,
	 * to mask unwanted interrupts from the interface during the reset.
	 * However, due to the design of PC hardware, this will cause an
	 * immediate interrupt due to the edge transition it produces.
	 * This single interrupt gives us a "fast poll" for drives that
	 * recover from reset very quickly, saving us the first 50ms wait time.
	 *
	 * TODO: add ->softreset method and stop abusing ->set_irq
	 */
	/* set SRST and nIEN */
	tp_ops->set_irq(hwif, 4);
	/* more than enough time */
	udelay(10);
	/* clear SRST, leave nIEN (unless device is on the quirk list) */
	tp_ops->set_irq(hwif, drive->quirk_list == 2);
	/* more than enough time */
	udelay(10);
	hwif->poll_timeout = jiffies + WAIT_WORSTCASE;
	hwif->polling = 1;
	__ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);

	/*
	 * Some weird controller like resetting themselves to a strange
	 * state when the disks are reset this way. At least, the Winbond
	 * 553 documentation says that
	 */
	port_ops = hwif->port_ops;
	if (port_ops && port_ops->resetproc)
		port_ops->resetproc(drive);

	spin_unlock_irqrestore(&hwif->lock, flags);
	return ide_started;
}

/*
 * ide_do_reset() is the entry point to the drive/interface reset code.
 */

ide_startstop_t ide_do_reset (ide_drive_t *drive)
{
	return do_reset1(drive, 0);
}

EXPORT_SYMBOL(ide_do_reset);

/*
 * ide_wait_not_busy() waits for the currently selected device on the hwif
 * to report a non-busy status, see comments in ide_probe_port().
 */
int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
{
	u8 stat = 0;

	while(timeout--) {
		/*
		 * Turn this into a schedule() sleep once I'm sure
		 * about locking issues (2.5 work ?).
		 */
		mdelay(1);
		stat = hwif->tp_ops->read_status(hwif);
		if ((stat & ATA_BUSY) == 0)
			return 0;
		/*
		 * Assume a value of 0xff means nothing is connected to
		 * the interface and it doesn't implement the pull-down
		 * resistor on D7.
		 */
		if (stat == 0xff)
			return -ENODEV;
		touch_softlockup_watchdog();
		touch_nmi_watchdog();
	}
	return -EBUSY;
}
OpenPOWER on IntegriCloud