summaryrefslogtreecommitdiffstats
path: root/drivers/ata/pata_legacy.c
blob: 6529d34f0370064fedf63e6bad80920b38a31f6d (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
/*
 *   pata-legacy.c - Legacy port PATA/SATA controller driver.
 *   Copyright 2005/2006 Red Hat <alan@redhat.com>, all rights reserved.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *   An ATA driver for the legacy ATA ports.
 *
 *   Data Sources:
 *	Opti 82C465/82C611 support: Data sheets at opti-inc.com
 *	HT6560 series:
 *	Promise 20230/20620:
 *		http://www.ryston.cz/petr/vlb/pdc20230b.html
 *		http://www.ryston.cz/petr/vlb/pdc20230c.html
 *		http://www.ryston.cz/petr/vlb/pdc20630.html
 *
 *  Unsupported but docs exist:
 *	Appian/Adaptec AIC25VL01/Cirrus Logic PD7220
 *	Winbond W83759A
 *
 *  This driver handles legacy (that is "ISA/VLB side") IDE ports found
 *  on PC class systems. There are three hybrid devices that are exceptions
 *  The Cyrix 5510/5520 where a pre SFF ATA device is on the bridge and
 *  the MPIIX where the tuning is PCI side but the IDE is "ISA side".
 *
 *  Specific support is included for the ht6560a/ht6560b/opti82c611a/
 *  opti82c465mv/promise 20230c/20630
 *
 *  Use the autospeed and pio_mask options with:
 *	Appian ADI/2 aka CLPD7220 or AIC25VL01.
 *  Use the jumpers, autospeed and set pio_mask to the mode on the jumpers with
 *	Goldstar GM82C711, PIC-1288A-125, UMC 82C871F, Winbond W83759,
 *	Winbond W83759A, Promise PDC20230-B
 *
 *  For now use autospeed and pio_mask as above with the W83759A. This may
 *  change.
 *
 *  TODO
 *	Merge existing pata_qdi driver
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <scsi/scsi_host.h>
#include <linux/ata.h>
#include <linux/libata.h>
#include <linux/platform_device.h>

#define DRV_NAME "pata_legacy"
#define DRV_VERSION "0.5.5"

#define NR_HOST 6

static int legacy_port[NR_HOST] = { 0x1f0, 0x170, 0x1e8, 0x168, 0x1e0, 0x160 };
static int legacy_irq[NR_HOST] = { 14, 15, 11, 10, 8, 12 };

struct legacy_data {
	unsigned long timing;
	u8 clock[2];
	u8 last;
	int fast;
	struct platform_device *platform_dev;

};

static struct legacy_data legacy_data[NR_HOST];
static struct ata_host *legacy_host[NR_HOST];
static int nr_legacy_host;


static int probe_all;			/* Set to check all ISA port ranges */
static int ht6560a;			/* HT 6560A on primary 1, secondary 2, both 3 */
static int ht6560b;			/* HT 6560A on primary 1, secondary 2, both 3 */
static int opti82c611a;			/* Opti82c611A on primary 1, secondary 2, both 3 */
static int opti82c46x;			/* Opti 82c465MV present (pri/sec autodetect) */
static int autospeed;			/* Chip present which snoops speed changes */
static int pio_mask = 0x1F;		/* PIO range for autospeed devices */
static int iordy_mask = 0xFFFFFFFF;	/* Use iordy if available */

/**
 *	legacy_set_mode		-	mode setting
 *	@link: IDE link
 *	@unused: Device that failed when error is returned
 *
 *	Use a non standard set_mode function. We don't want to be tuned.
 *
 *	The BIOS configured everything. Our job is not to fiddle. Just use
 *	whatever PIO the hardware is using and leave it at that. When we
 *	get some kind of nice user driven API for control then we can
 *	expand on this as per hdparm in the base kernel.
 */

static int legacy_set_mode(struct ata_link *link, struct ata_device **unused)
{
	struct ata_device *dev;

	ata_link_for_each_dev(dev, link) {
		if (ata_dev_enabled(dev)) {
			ata_dev_printk(dev, KERN_INFO, "configured for PIO\n");
			dev->pio_mode = XFER_PIO_0;
			dev->xfer_mode = XFER_PIO_0;
			dev->xfer_shift = ATA_SHIFT_PIO;
			dev->flags |= ATA_DFLAG_PIO;
		}
	}
	return 0;
}

static struct scsi_host_template legacy_sht = {
	.module			= THIS_MODULE,
	.name			= DRV_NAME,
	.ioctl			= ata_scsi_ioctl,
	.queuecommand		= ata_scsi_queuecmd,
	.can_queue		= ATA_DEF_QUEUE,
	.this_id		= ATA_SHT_THIS_ID,
	.sg_tablesize		= LIBATA_MAX_PRD,
	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
	.emulated		= ATA_SHT_EMULATED,
	.use_clustering		= ATA_SHT_USE_CLUSTERING,
	.proc_name		= DRV_NAME,
	.dma_boundary		= ATA_DMA_BOUNDARY,
	.slave_configure	= ata_scsi_slave_config,
	.slave_destroy		= ata_scsi_slave_destroy,
	.bios_param		= ata_std_bios_param,
};

/*
 *	These ops are used if the user indicates the hardware
 *	snoops the commands to decide on the mode and handles the
 *	mode selection "magically" itself. Several legacy controllers
 *	do this. The mode range can be set if it is not 0x1F by setting
 *	pio_mask as well.
 */

static struct ata_port_operations simple_port_ops = {
	.port_disable	= ata_port_disable,
	.tf_load	= ata_tf_load,
	.tf_read	= ata_tf_read,
	.check_status 	= ata_check_status,
	.exec_command	= ata_exec_command,
	.dev_select 	= ata_std_dev_select,

	.freeze		= ata_bmdma_freeze,
	.thaw		= ata_bmdma_thaw,
	.error_handler	= ata_bmdma_error_handler,
	.post_internal_cmd = ata_bmdma_post_internal_cmd,
	.cable_detect	= ata_cable_40wire,

	.qc_prep 	= ata_qc_prep,
	.qc_issue	= ata_qc_issue_prot,

	.data_xfer	= ata_data_xfer_noirq,

	.irq_handler	= ata_interrupt,
	.irq_clear	= ata_bmdma_irq_clear,
	.irq_on		= ata_irq_on,

	.port_start	= ata_port_start,
};

static struct ata_port_operations legacy_port_ops = {
	.set_mode	= legacy_set_mode,

	.port_disable	= ata_port_disable,
	.tf_load	= ata_tf_load,
	.tf_read	= ata_tf_read,
	.check_status 	= ata_check_status,
	.exec_command	= ata_exec_command,
	.dev_select 	= ata_std_dev_select,
	.cable_detect	= ata_cable_40wire,

	.freeze		= ata_bmdma_freeze,
	.thaw		= ata_bmdma_thaw,
	.error_handler	= ata_bmdma_error_handler,
	.post_internal_cmd = ata_bmdma_post_internal_cmd,

	.qc_prep 	= ata_qc_prep,
	.qc_issue	= ata_qc_issue_prot,

	.data_xfer	= ata_data_xfer_noirq,

	.irq_handler	= ata_interrupt,
	.irq_clear	= ata_bmdma_irq_clear,
	.irq_on		= ata_irq_on,

	.port_start	= ata_port_start,
};

/*
 *	Promise 20230C and 20620 support
 *
 *	This controller supports PIO0 to PIO2. We set PIO timings conservatively to
 *	allow for 50MHz Vesa Local Bus. The 20620 DMA support is weird being DMA to
 *	controller and PIO'd to the host and not supported.
 */

static void pdc20230_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
	int tries = 5;
	int pio = adev->pio_mode - XFER_PIO_0;
	u8 rt;
	unsigned long flags;

	/* Safe as UP only. Force I/Os to occur together */

	local_irq_save(flags);

	/* Unlock the control interface */
	do
	{
		inb(0x1F5);
		outb(inb(0x1F2) | 0x80, 0x1F2);
		inb(0x1F2);
		inb(0x3F6);
		inb(0x3F6);
		inb(0x1F2);
		inb(0x1F2);
	}
	while((inb(0x1F2) & 0x80) && --tries);

	local_irq_restore(flags);

	outb(inb(0x1F4) & 0x07, 0x1F4);

	rt = inb(0x1F3);
	rt &= 0x07 << (3 * adev->devno);
	if (pio)
		rt |= (1 + 3 * pio) << (3 * adev->devno);

	udelay(100);
	outb(inb(0x1F2) | 0x01, 0x1F2);
	udelay(100);
	inb(0x1F5);

}

static void pdc_data_xfer_vlb(struct ata_device *adev, unsigned char *buf, unsigned int buflen, int write_data)
{
	struct ata_port *ap = adev->link->ap;
	int slop = buflen & 3;
	unsigned long flags;

	if (ata_id_has_dword_io(adev->id)) {
		local_irq_save(flags);

		/* Perform the 32bit I/O synchronization sequence */
		ioread8(ap->ioaddr.nsect_addr);
		ioread8(ap->ioaddr.nsect_addr);
		ioread8(ap->ioaddr.nsect_addr);

		/* Now the data */

		if (write_data)
			iowrite32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);
		else
			ioread32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);

		if (unlikely(slop)) {
			u32 pad;
			if (write_data) {
				memcpy(&pad, buf + buflen - slop, slop);
				pad = le32_to_cpu(pad);
				iowrite32(pad, ap->ioaddr.data_addr);
			} else {
				pad = ioread32(ap->ioaddr.data_addr);
				pad = cpu_to_le16(pad);
				memcpy(buf + buflen - slop, &pad, slop);
			}
		}
		local_irq_restore(flags);
	}
	else
		ata_data_xfer_noirq(adev, buf, buflen, write_data);
}

static struct ata_port_operations pdc20230_port_ops = {
	.set_piomode	= pdc20230_set_piomode,

	.port_disable	= ata_port_disable,
	.tf_load	= ata_tf_load,
	.tf_read	= ata_tf_read,
	.check_status 	= ata_check_status,
	.exec_command	= ata_exec_command,
	.dev_select 	= ata_std_dev_select,

	.freeze		= ata_bmdma_freeze,
	.thaw		= ata_bmdma_thaw,
	.error_handler	= ata_bmdma_error_handler,
	.post_internal_cmd = ata_bmdma_post_internal_cmd,
	.cable_detect	= ata_cable_40wire,

	.qc_prep 	= ata_qc_prep,
	.qc_issue	= ata_qc_issue_prot,

	.data_xfer	= pdc_data_xfer_vlb,

	.irq_handler	= ata_interrupt,
	.irq_clear	= ata_bmdma_irq_clear,
	.irq_on		= ata_irq_on,

	.port_start	= ata_port_start,
};

/*
 *	Holtek 6560A support
 *
 *	This controller supports PIO0 to PIO2 (no IORDY even though higher timings
 *	can be loaded).
 */

static void ht6560a_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
	u8 active, recover;
	struct ata_timing t;

	/* Get the timing data in cycles. For now play safe at 50Mhz */
	ata_timing_compute(adev, adev->pio_mode, &t, 20000, 1000);

	active = FIT(t.active, 2, 15);
	recover = FIT(t.recover, 4, 15);

	inb(0x3E6);
	inb(0x3E6);
	inb(0x3E6);
	inb(0x3E6);

	iowrite8(recover << 4 | active, ap->ioaddr.device_addr);
	ioread8(ap->ioaddr.status_addr);
}

static struct ata_port_operations ht6560a_port_ops = {
	.set_piomode	= ht6560a_set_piomode,

	.port_disable	= ata_port_disable,
	.tf_load	= ata_tf_load,
	.tf_read	= ata_tf_read,
	.check_status 	= ata_check_status,
	.exec_command	= ata_exec_command,
	.dev_select 	= ata_std_dev_select,

	.freeze		= ata_bmdma_freeze,
	.thaw		= ata_bmdma_thaw,
	.error_handler	= ata_bmdma_error_handler,
	.post_internal_cmd = ata_bmdma_post_internal_cmd,
	.cable_detect	= ata_cable_40wire,

	.qc_prep 	= ata_qc_prep,
	.qc_issue	= ata_qc_issue_prot,

	.data_xfer	= ata_data_xfer,	/* Check vlb/noirq */

	.irq_handler	= ata_interrupt,
	.irq_clear	= ata_bmdma_irq_clear,
	.irq_on		= ata_irq_on,

	.port_start	= ata_port_start,
};

/*
 *	Holtek 6560B support
 *
 *	This controller supports PIO0 to PIO4. We honour the BIOS/jumper FIFO setting
 *	unless we see an ATAPI device in which case we force it off.
 *
 *	FIXME: need to implement 2nd channel support.
 */

static void ht6560b_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
	u8 active, recover;
	struct ata_timing t;

	/* Get the timing data in cycles. For now play safe at 50Mhz */
	ata_timing_compute(adev, adev->pio_mode, &t, 20000, 1000);

	active = FIT(t.active, 2, 15);
	recover = FIT(t.recover, 2, 16);
	recover &= 0x15;

	inb(0x3E6);
	inb(0x3E6);
	inb(0x3E6);
	inb(0x3E6);

	iowrite8(recover << 4 | active, ap->ioaddr.device_addr);

	if (adev->class != ATA_DEV_ATA) {
		u8 rconf = inb(0x3E6);
		if (rconf & 0x24) {
			rconf &= ~ 0x24;
			outb(rconf, 0x3E6);
		}
	}
	ioread8(ap->ioaddr.status_addr);
}

static struct ata_port_operations ht6560b_port_ops = {
	.set_piomode	= ht6560b_set_piomode,

	.port_disable	= ata_port_disable,
	.tf_load	= ata_tf_load,
	.tf_read	= ata_tf_read,
	.check_status 	= ata_check_status,
	.exec_command	= ata_exec_command,
	.dev_select 	= ata_std_dev_select,

	.freeze		= ata_bmdma_freeze,
	.thaw		= ata_bmdma_thaw,
	.error_handler	= ata_bmdma_error_handler,
	.post_internal_cmd = ata_bmdma_post_internal_cmd,
	.cable_detect	= ata_cable_40wire,

	.qc_prep 	= ata_qc_prep,
	.qc_issue	= ata_qc_issue_prot,

	.data_xfer	= ata_data_xfer,	/* FIXME: Check 32bit and noirq */

	.irq_handler	= ata_interrupt,
	.irq_clear	= ata_bmdma_irq_clear,
	.irq_on		= ata_irq_on,

	.port_start	= ata_port_start,
};

/*
 *	Opti core chipset helpers
 */

/**
 *	opti_syscfg	-	read OPTI chipset configuration
 *	@reg: Configuration register to read
 *
 *	Returns the value of an OPTI system board configuration register.
 */

static u8 opti_syscfg(u8 reg)
{
	unsigned long flags;
	u8 r;

	/* Uniprocessor chipset and must force cycles adjancent */
	local_irq_save(flags);
	outb(reg, 0x22);
	r = inb(0x24);
	local_irq_restore(flags);
	return r;
}

/*
 *	Opti 82C611A
 *
 *	This controller supports PIO0 to PIO3.
 */

static void opti82c611a_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
	u8 active, recover, setup;
	struct ata_timing t;
	struct ata_device *pair = ata_dev_pair(adev);
	int clock;
	int khz[4] = { 50000, 40000, 33000, 25000 };
	u8 rc;

	/* Enter configuration mode */
	ioread16(ap->ioaddr.error_addr);
	ioread16(ap->ioaddr.error_addr);
	iowrite8(3, ap->ioaddr.nsect_addr);

	/* Read VLB clock strapping */
	clock = 1000000000 / khz[ioread8(ap->ioaddr.lbah_addr) & 0x03];

	/* Get the timing data in cycles */
	ata_timing_compute(adev, adev->pio_mode, &t, clock, 1000);

	/* Setup timing is shared */
	if (pair) {
		struct ata_timing tp;
		ata_timing_compute(pair, pair->pio_mode, &tp, clock, 1000);

		ata_timing_merge(&t, &tp, &t, ATA_TIMING_SETUP);
	}

	active = FIT(t.active, 2, 17) - 2;
	recover = FIT(t.recover, 1, 16) - 1;
	setup = FIT(t.setup, 1, 4) - 1;

	/* Select the right timing bank for write timing */
	rc = ioread8(ap->ioaddr.lbal_addr);
	rc &= 0x7F;
	rc |= (adev->devno << 7);
	iowrite8(rc, ap->ioaddr.lbal_addr);

	/* Write the timings */
	iowrite8(active << 4 | recover, ap->ioaddr.error_addr);

	/* Select the right bank for read timings, also
	   load the shared timings for address */
	rc = ioread8(ap->ioaddr.device_addr);
	rc &= 0xC0;
	rc |= adev->devno;	/* Index select */
	rc |= (setup << 4) | 0x04;
	iowrite8(rc, ap->ioaddr.device_addr);

	/* Load the read timings */
	iowrite8(active << 4 | recover, ap->ioaddr.data_addr);

	/* Ensure the timing register mode is right */
	rc = ioread8(ap->ioaddr.lbal_addr);
	rc &= 0x73;
	rc |= 0x84;
	iowrite8(rc, ap->ioaddr.lbal_addr);

	/* Exit command mode */
	iowrite8(0x83,  ap->ioaddr.nsect_addr);
}


static struct ata_port_operations opti82c611a_port_ops = {
	.set_piomode	= opti82c611a_set_piomode,

	.port_disable	= ata_port_disable,
	.tf_load	= ata_tf_load,
	.tf_read	= ata_tf_read,
	.check_status 	= ata_check_status,
	.exec_command	= ata_exec_command,
	.dev_select 	= ata_std_dev_select,

	.freeze		= ata_bmdma_freeze,
	.thaw		= ata_bmdma_thaw,
	.error_handler	= ata_bmdma_error_handler,
	.post_internal_cmd = ata_bmdma_post_internal_cmd,
	.cable_detect	= ata_cable_40wire,

	.qc_prep 	= ata_qc_prep,
	.qc_issue	= ata_qc_issue_prot,

	.data_xfer	= ata_data_xfer,

	.irq_handler	= ata_interrupt,
	.irq_clear	= ata_bmdma_irq_clear,
	.irq_on		= ata_irq_on,

	.port_start	= ata_port_start,
};

/*
 *	Opti 82C465MV
 *
 *	This controller supports PIO0 to PIO3. Unlike the 611A the MVB
 *	version is dual channel but doesn't have a lot of unique registers.
 */

static void opti82c46x_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
	u8 active, recover, setup;
	struct ata_timing t;
	struct ata_device *pair = ata_dev_pair(adev);
	int clock;
	int khz[4] = { 50000, 40000, 33000, 25000 };
	u8 rc;
	u8 sysclk;

	/* Get the clock */
	sysclk = opti_syscfg(0xAC) & 0xC0;	/* BIOS set */

	/* Enter configuration mode */
	ioread16(ap->ioaddr.error_addr);
	ioread16(ap->ioaddr.error_addr);
	iowrite8(3, ap->ioaddr.nsect_addr);

	/* Read VLB clock strapping */
	clock = 1000000000 / khz[sysclk];

	/* Get the timing data in cycles */
	ata_timing_compute(adev, adev->pio_mode, &t, clock, 1000);

	/* Setup timing is shared */
	if (pair) {
		struct ata_timing tp;
		ata_timing_compute(pair, pair->pio_mode, &tp, clock, 1000);

		ata_timing_merge(&t, &tp, &t, ATA_TIMING_SETUP);
	}

	active = FIT(t.active, 2, 17) - 2;
	recover = FIT(t.recover, 1, 16) - 1;
	setup = FIT(t.setup, 1, 4) - 1;

	/* Select the right timing bank for write timing */
	rc = ioread8(ap->ioaddr.lbal_addr);
	rc &= 0x7F;
	rc |= (adev->devno << 7);
	iowrite8(rc, ap->ioaddr.lbal_addr);

	/* Write the timings */
	iowrite8(active << 4 | recover, ap->ioaddr.error_addr);

	/* Select the right bank for read timings, also
	   load the shared timings for address */
	rc = ioread8(ap->ioaddr.device_addr);
	rc &= 0xC0;
	rc |= adev->devno;	/* Index select */
	rc |= (setup << 4) | 0x04;
	iowrite8(rc, ap->ioaddr.device_addr);

	/* Load the read timings */
	iowrite8(active << 4 | recover, ap->ioaddr.data_addr);

	/* Ensure the timing register mode is right */
	rc = ioread8(ap->ioaddr.lbal_addr);
	rc &= 0x73;
	rc |= 0x84;
	iowrite8(rc, ap->ioaddr.lbal_addr);

	/* Exit command mode */
	iowrite8(0x83,  ap->ioaddr.nsect_addr);

	/* We need to know this for quad device on the MVB */
	ap->host->private_data = ap;
}

/**
 *	opt82c465mv_qc_issue_prot	-	command issue
 *	@qc: command pending
 *
 *	Called when the libata layer is about to issue a command. We wrap
 *	this interface so that we can load the correct ATA timings. The
 *	MVB has a single set of timing registers and these are shared
 *	across channels. As there are two registers we really ought to
 *	track the last two used values as a sort of register window. For
 *	now we just reload on a channel switch. On the single channel
 *	setup this condition never fires so we do nothing extra.
 *
 *	FIXME: dual channel needs ->serialize support
 */

static unsigned int opti82c46x_qc_issue_prot(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	struct ata_device *adev = qc->dev;

	/* If timings are set and for the wrong channel (2nd test is
	   due to a libata shortcoming and will eventually go I hope) */
	if (ap->host->private_data != ap->host
	    && ap->host->private_data != NULL)
		opti82c46x_set_piomode(ap, adev);

	return ata_qc_issue_prot(qc);
}

static struct ata_port_operations opti82c46x_port_ops = {
	.set_piomode	= opti82c46x_set_piomode,

	.port_disable	= ata_port_disable,
	.tf_load	= ata_tf_load,
	.tf_read	= ata_tf_read,
	.check_status 	= ata_check_status,
	.exec_command	= ata_exec_command,
	.dev_select 	= ata_std_dev_select,

	.freeze		= ata_bmdma_freeze,
	.thaw		= ata_bmdma_thaw,
	.error_handler	= ata_bmdma_error_handler,
	.post_internal_cmd = ata_bmdma_post_internal_cmd,
	.cable_detect	= ata_cable_40wire,

	.qc_prep 	= ata_qc_prep,
	.qc_issue	= opti82c46x_qc_issue_prot,

	.data_xfer	= ata_data_xfer,

	.irq_handler	= ata_interrupt,
	.irq_clear	= ata_bmdma_irq_clear,
	.irq_on		= ata_irq_on,

	.port_start	= ata_port_start,
};


/**
 *	legacy_init_one		-	attach a legacy interface
 *	@port: port number
 *	@io: I/O port start
 *	@ctrl: control port
 *	@irq: interrupt line
 *
 *	Register an ISA bus IDE interface. Such interfaces are PIO and we
 *	assume do not support IRQ sharing.
 */

static __init int legacy_init_one(int port, unsigned long io, unsigned long ctrl, int irq)
{
	struct legacy_data *ld = &legacy_data[nr_legacy_host];
	struct ata_host *host;
	struct ata_port *ap;
	struct platform_device *pdev;
	struct ata_port_operations *ops = &legacy_port_ops;
	void __iomem *io_addr, *ctrl_addr;
	int pio_modes = pio_mask;
	u32 mask = (1 << port);
	u32 iordy = (iordy_mask & mask) ? 0: ATA_FLAG_NO_IORDY;
	int ret;

	pdev = platform_device_register_simple(DRV_NAME, nr_legacy_host, NULL, 0);
	if (IS_ERR(pdev))
		return PTR_ERR(pdev);

	ret = -EBUSY;
	if (devm_request_region(&pdev->dev, io, 8, "pata_legacy") == NULL ||
	    devm_request_region(&pdev->dev, ctrl, 1, "pata_legacy") == NULL)
		goto fail;

	ret = -ENOMEM;
	io_addr = devm_ioport_map(&pdev->dev, io, 8);
	ctrl_addr = devm_ioport_map(&pdev->dev, ctrl, 1);
	if (!io_addr || !ctrl_addr)
		goto fail;

	if (ht6560a & mask) {
		ops = &ht6560a_port_ops;
		pio_modes = 0x07;
		iordy = ATA_FLAG_NO_IORDY;
	}
	if (ht6560b & mask) {
		ops = &ht6560b_port_ops;
		pio_modes = 0x1F;
	}
	if (opti82c611a & mask) {
		ops = &opti82c611a_port_ops;
		pio_modes = 0x0F;
	}
	if (opti82c46x & mask) {
		ops = &opti82c46x_port_ops;
		pio_modes = 0x0F;
	}

	/* Probe for automatically detectable controllers */

	if (io == 0x1F0 && ops == &legacy_port_ops) {
		unsigned long flags;

		local_irq_save(flags);

		/* Probes */
		inb(0x1F5);
		outb(inb(0x1F2) | 0x80, 0x1F2);
		inb(0x1F2);
		inb(0x3F6);
		inb(0x3F6);
		inb(0x1F2);
		inb(0x1F2);

		if ((inb(0x1F2) & 0x80) == 0) {
			/* PDC20230c or 20630 ? */
			printk(KERN_INFO "PDC20230-C/20630 VLB ATA controller detected.\n");
				pio_modes = 0x07;
			ops = &pdc20230_port_ops;
			iordy = ATA_FLAG_NO_IORDY;
			udelay(100);
			inb(0x1F5);
		} else {
			outb(0x55, 0x1F2);
			inb(0x1F2);
			inb(0x1F2);
			if (inb(0x1F2) == 0x00) {
				printk(KERN_INFO "PDC20230-B VLB ATA controller detected.\n");
			}
		}
		local_irq_restore(flags);
	}


	/* Chip does mode setting by command snooping */
	if (ops == &legacy_port_ops && (autospeed & mask))
		ops = &simple_port_ops;

	ret = -ENOMEM;
	host = ata_host_alloc(&pdev->dev, 1);
	if (!host)
		goto fail;
	ap = host->ports[0];

	ap->ops = ops;
	ap->pio_mask = pio_modes;
	ap->flags |= ATA_FLAG_SLAVE_POSS | iordy;
	ap->ioaddr.cmd_addr = io_addr;
	ap->ioaddr.altstatus_addr = ctrl_addr;
	ap->ioaddr.ctl_addr = ctrl_addr;
	ata_std_ports(&ap->ioaddr);
	ap->private_data = ld;

	ret = ata_host_activate(host, irq, ata_interrupt, 0, &legacy_sht);
	if (ret)
		goto fail;

	legacy_host[nr_legacy_host++] = dev_get_drvdata(&pdev->dev);
	ld->platform_dev = pdev;
	return 0;

fail:
	platform_device_unregister(pdev);
	return ret;
}

/**
 *	legacy_check_special_cases	-	ATA special cases
 *	@p: PCI device to check
 *	@master: set this if we find an ATA master
 *	@master: set this if we find an ATA secondary
 *
 *	A small number of vendors implemented early PCI ATA interfaces on bridge logic
 *	without the ATA interface being PCI visible. Where we have a matching PCI driver
 *	we must skip the relevant device here. If we don't know about it then the legacy
 *	driver is the right driver anyway.
 */

static void legacy_check_special_cases(struct pci_dev *p, int *primary, int *secondary)
{
	/* Cyrix CS5510 pre SFF MWDMA ATA on the bridge */
	if (p->vendor == 0x1078 && p->device == 0x0000) {
		*primary = *secondary = 1;
		return;
	}
	/* Cyrix CS5520 pre SFF MWDMA ATA on the bridge */
	if (p->vendor == 0x1078 && p->device == 0x0002) {
		*primary = *secondary = 1;
		return;
	}
	/* Intel MPIIX - PIO ATA on non PCI side of bridge */
	if (p->vendor == 0x8086 && p->device == 0x1234) {
		u16 r;
		pci_read_config_word(p, 0x6C, &r);
		if (r & 0x8000) {	/* ATA port enabled */
			if (r & 0x4000)
				*secondary = 1;
			else
				*primary = 1;
		}
		return;
	}
}


/**
 *	legacy_init		-	attach legacy interfaces
 *
 *	Attach legacy IDE interfaces by scanning the usual IRQ/port suspects.
 *	Right now we do not scan the ide0 and ide1 address but should do so
 *	for non PCI systems or systems with no PCI IDE legacy mode devices.
 *	If you fix that note there are special cases to consider like VLB
 *	drivers and CS5510/20.
 */

static __init int legacy_init(void)
{
	int i;
	int ct = 0;
	int primary = 0;
	int secondary = 0;
	int last_port = NR_HOST;

	struct pci_dev *p = NULL;

	for_each_pci_dev(p) {
		int r;
		/* Check for any overlap of the system ATA mappings. Native mode controllers
		   stuck on these addresses or some devices in 'raid' mode won't be found by
		   the storage class test */
		for (r = 0; r < 6; r++) {
			if (pci_resource_start(p, r) == 0x1f0)
				primary = 1;
			if (pci_resource_start(p, r) == 0x170)
				secondary = 1;
		}
		/* Check for special cases */
		legacy_check_special_cases(p, &primary, &secondary);

		/* If PCI bus is present then don't probe for tertiary legacy ports */
		if (probe_all == 0)
			last_port = 2;
	}

	/* If an OPTI 82C46X is present find out where the channels are */
	if (opti82c46x) {
		static const char *optis[4] = {
			"3/463MV", "5MV",
			"5MVA", "5MVB"
		};
		u8 chans = 1;
		u8 ctrl = (opti_syscfg(0x30) & 0xC0) >> 6;

		opti82c46x = 3;	/* Assume master and slave first */
		printk(KERN_INFO DRV_NAME ": Opti 82C46%s chipset support.\n", optis[ctrl]);
		if (ctrl == 3)
			chans = (opti_syscfg(0x3F) & 0x20) ? 2 : 1;
		ctrl = opti_syscfg(0xAC);
		/* Check enabled and this port is the 465MV port. On the
		   MVB we may have two channels */
		if (ctrl & 8) {
			if (ctrl & 4)
				opti82c46x = 2;	/* Slave */
			else
				opti82c46x = 1;	/* Master */
			if (chans == 2)
				opti82c46x = 3; /* Master and Slave */
		}	/* Slave only */
		else if (chans == 1)
			opti82c46x = 1;
	}

	for (i = 0; i < last_port; i++) {
		/* Skip primary if we have seen a PCI one */
		if (i == 0 && primary == 1)
			continue;
		/* Skip secondary if we have seen a PCI one */
		if (i == 1 && secondary == 1)
			continue;
		if (legacy_init_one(i, legacy_port[i],
				   legacy_port[i] + 0x0206,
				   legacy_irq[i]) == 0)
			ct++;
	}
	if (ct != 0)
		return 0;
	return -ENODEV;
}

static __exit void legacy_exit(void)
{
	int i;

	for (i = 0; i < nr_legacy_host; i++) {
		struct legacy_data *ld = &legacy_data[i];

		ata_host_detach(legacy_host[i]);
		platform_device_unregister(ld->platform_dev);
		if (ld->timing)
			release_region(ld->timing, 2);
	}
}

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for legacy ATA");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

module_param(probe_all, int, 0);
module_param(autospeed, int, 0);
module_param(ht6560a, int, 0);
module_param(ht6560b, int, 0);
module_param(opti82c611a, int, 0);
module_param(opti82c46x, int, 0);
module_param(pio_mask, int, 0);
module_param(iordy_mask, int, 0);

module_init(legacy_init);
module_exit(legacy_exit);