aboutsummaryrefslogtreecommitdiff
path: root/drivers/ata/pata_pdc2027x.c
blob: b183511225252bcd2411021c78fefd8e5ac5a752 (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
/*
 *  Promise PATA TX2/TX4/TX2000/133 IDE driver for pdc20268 to pdc20277.
 *
 *  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 of the License, or (at your option) any later version.
 *
 *  Ported to libata by:
 *  Albert Lee <albertcc@tw.ibm.com> IBM Corporation
 *
 *  Copyright (C) 1998-2002		Andre Hedrick <andre@linux-ide.org>
 *  Portions Copyright (C) 1999 Promise Technology, Inc.
 *
 *  Author: Frank Tiernan (frankt@promise.com)
 *  Released under terms of General Public License
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *  Hardware information only available under NDA.
 *
 */
#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 <linux/device.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_cmnd.h>
#include <linux/libata.h>

#define DRV_NAME	"pata_pdc2027x"
#define DRV_VERSION	"1.0"
#undef PDC_DEBUG

#ifdef PDC_DEBUG
#define PDPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ## args)
#else
#define PDPRINTK(fmt, args...)
#endif

enum {
	PDC_MMIO_BAR		= 5,

	PDC_UDMA_100		= 0,
	PDC_UDMA_133		= 1,

	PDC_100_MHZ		= 100000000,
	PDC_133_MHZ		= 133333333,

	PDC_SYS_CTL		= 0x1100,
	PDC_ATA_CTL		= 0x1104,
	PDC_GLOBAL_CTL		= 0x1108,
	PDC_CTCR0		= 0x110C,
	PDC_CTCR1		= 0x1110,
	PDC_BYTE_COUNT		= 0x1120,
	PDC_PLL_CTL		= 0x1202,
};

static int pdc2027x_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
static int pdc2027x_prereset(struct ata_link *link, unsigned long deadline);
static void pdc2027x_set_piomode(struct ata_port *ap, struct ata_device *adev);
static void pdc2027x_set_dmamode(struct ata_port *ap, struct ata_device *adev);
static int pdc2027x_check_atapi_dma(struct ata_queued_cmd *qc);
static unsigned long pdc2027x_mode_filter(struct ata_device *adev, unsigned long mask);
static int pdc2027x_cable_detect(struct ata_port *ap);
static int pdc2027x_set_mode(struct ata_link *link, struct ata_device **r_failed);

/*
 * ATA Timing Tables based on 133MHz controller clock.
 * These tables are only used when the controller is in 133MHz clock.
 * If the controller is in 100MHz clock, the ASIC hardware will
 * set the timing registers automatically when "set feature" command
 * is issued to the device. However, if the controller clock is 133MHz,
 * the following tables must be used.
 */
static struct pdc2027x_pio_timing {
	u8 value0, value1, value2;
} pdc2027x_pio_timing_tbl [] = {
	{ 0xfb, 0x2b, 0xac }, /* PIO mode 0 */
	{ 0x46, 0x29, 0xa4 }, /* PIO mode 1 */
	{ 0x23, 0x26, 0x64 }, /* PIO mode 2 */
	{ 0x27, 0x0d, 0x35 }, /* PIO mode 3, IORDY on, Prefetch off */
	{ 0x23, 0x09, 0x25 }, /* PIO mode 4, IORDY on, Prefetch off */
};

static struct pdc2027x_mdma_timing {
	u8 value0, value1;
} pdc2027x_mdma_timing_tbl [] = {
	{ 0xdf, 0x5f }, /* MDMA mode 0 */
	{ 0x6b, 0x27 }, /* MDMA mode 1 */
	{ 0x69, 0x25 }, /* MDMA mode 2 */
};

static struct pdc2027x_udma_timing {
	u8 value0, value1, value2;
} pdc2027x_udma_timing_tbl [] = {
	{ 0x4a, 0x0f, 0xd5 }, /* UDMA mode 0 */
	{ 0x3a, 0x0a, 0xd0 }, /* UDMA mode 1 */
	{ 0x2a, 0x07, 0xcd }, /* UDMA mode 2 */
	{ 0x1a, 0x05, 0xcd }, /* UDMA mode 3 */
	{ 0x1a, 0x03, 0xcd }, /* UDMA mode 4 */
	{ 0x1a, 0x02, 0xcb }, /* UDMA mode 5 */
	{ 0x1a, 0x01, 0xcb }, /* UDMA mode 6 */
};

static const struct pci_device_id pdc2027x_pci_tbl[] = {
	{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20268), PDC_UDMA_100 },
	{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20269), PDC_UDMA_133 },
	{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20270), PDC_UDMA_100 },
	{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20271), PDC_UDMA_133 },
	{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20275), PDC_UDMA_133 },
	{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20276), PDC_UDMA_133 },
	{ PCI_VDEVICE(PROMISE, PCI_DEVICE_ID_PROMISE_20277), PDC_UDMA_133 },

	{ }	/* terminate list */
};

static struct pci_driver pdc2027x_pci_driver = {
	.name			= DRV_NAME,
	.id_table		= pdc2027x_pci_tbl,
	.probe			= pdc2027x_init_one,
	.remove			= ata_pci_remove_one,
};

static struct scsi_host_template pdc2027x_sht = {
	ATA_BMDMA_SHT(DRV_NAME),
};

static struct ata_port_operations pdc2027x_pata100_ops = {
	.inherits		= &ata_bmdma_port_ops,
	.check_atapi_dma	= pdc2027x_check_atapi_dma,
	.cable_detect		= pdc2027x_cable_detect,
	.prereset		= pdc2027x_prereset,
};

static struct ata_port_operations pdc2027x_pata133_ops = {
	.inherits		= &pdc2027x_pata100_ops,
	.mode_filter		= pdc2027x_mode_filter,
	.set_piomode		= pdc2027x_set_piomode,
	.set_dmamode		= pdc2027x_set_dmamode,
	.set_mode		= pdc2027x_set_mode,
};

static struct ata_port_info pdc2027x_port_info[] = {
	/* PDC_UDMA_100 */
	{
		.flags		= ATA_FLAG_NO_LEGACY | ATA_FLAG_SLAVE_POSS |
		                  ATA_FLAG_MMIO,
		.pio_mask	= ATA_PIO4,
		.mwdma_mask	= ATA_MWDMA2,
		.udma_mask	= ATA_UDMA5,
		.port_ops	= &pdc2027x_pata100_ops,
	},
	/* PDC_UDMA_133 */
	{
		.flags		= ATA_FLAG_NO_LEGACY | ATA_FLAG_SLAVE_POSS |
                        	  ATA_FLAG_MMIO,
		.pio_mask	= ATA_PIO4,
		.mwdma_mask	= ATA_MWDMA2,
		.udma_mask	= ATA_UDMA6,
		.port_ops	= &pdc2027x_pata133_ops,
	},
};

MODULE_AUTHOR("Andre Hedrick, Frank Tiernan, Albert Lee");
MODULE_DESCRIPTION("libata driver module for Promise PDC20268 to PDC20277");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
MODULE_DEVICE_TABLE(pci, pdc2027x_pci_tbl);

/**
 *	port_mmio - Get the MMIO address of PDC2027x extended registers
 *	@ap: Port
 *	@offset: offset from mmio base
 */
static inline void __iomem *port_mmio(struct ata_port *ap, unsigned int offset)
{
	return ap->host->iomap[PDC_MMIO_BAR] + ap->port_no * 0x100 + offset;
}

/**
 *	dev_mmio - Get the MMIO address of PDC2027x extended registers
 *	@ap: Port
 *	@adev: device
 *	@offset: offset from mmio base
 */
static inline void __iomem *dev_mmio(struct ata_port *ap, struct ata_device *adev, unsigned int offset)
{
	u8 adj = (adev->devno) ? 0x08 : 0x00;
	return port_mmio(ap, offset) + adj;
}

/**
 *	pdc2027x_pata_cable_detect - Probe host controller cable detect info
 *	@ap: Port for which cable detect info is desired
 *
 *	Read 80c cable indicator from Promise extended register.
 *      This register is latched when the system is reset.
 *
 *	LOCKING:
 *	None (inherited from caller).
 */
static int pdc2027x_cable_detect(struct ata_port *ap)
{
	u32 cgcr;

	/* check cable detect results */
	cgcr = ioread32(port_mmio(ap, PDC_GLOBAL_CTL));
	if (cgcr & (1 << 26))
		goto cbl40;

	PDPRINTK("No cable or 80-conductor cable on port %d\n", ap->port_no);

	return ATA_CBL_PATA80;
cbl40:
	printk(KERN_INFO DRV_NAME ": 40-conductor cable detected on port %d\n", ap->port_no);
	return ATA_CBL_PATA40;
}

/**
 * pdc2027x_port_enabled - Check PDC ATA control register to see whether the port is enabled.
 * @ap: Port to check
 */
static inline int pdc2027x_port_enabled(struct ata_port *ap)
{
	return ioread8(port_mmio(ap, PDC_ATA_CTL)) & 0x02;
}

/**
 *	pdc2027x_prereset - prereset for PATA host controller
 *	@link: Target link
 *	@deadline: deadline jiffies for the operation
 *
 *	Probeinit including cable detection.
 *
 *	LOCKING:
 *	None (inherited from caller).
 */

static int pdc2027x_prereset(struct ata_link *link, unsigned long deadline)
{
	/* Check whether port enabled */
	if (!pdc2027x_port_enabled(link->ap))
		return -ENOENT;
	return ata_sff_prereset(link, deadline);
}

/**
 *	pdc2720x_mode_filter	-	mode selection filter
 *	@adev: ATA device
 *	@mask: list of modes proposed
 *
 *	Block UDMA on devices that cause trouble with this controller.
 */

static unsigned long pdc2027x_mode_filter(struct ata_device *adev, unsigned long mask)
{
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	struct ata_device *pair = ata_dev_pair(adev);

	if (adev->class != ATA_DEV_ATA || adev->devno == 0 || pair == NULL)
		return mask;

	/* Check for slave of a Maxtor at UDMA6 */
	ata_id_c_string(pair->id, model_num, ATA_ID_PROD,
			  ATA_ID_PROD_LEN + 1);
	/* If the master is a maxtor in UDMA6 then the slave should not use UDMA 6 */
	if (strstr(model_num, "Maxtor") == NULL && pair->dma_mode == XFER_UDMA_6)
		mask &= ~ (1 << (6 + ATA_SHIFT_UDMA));

	return mask;
}

/**
 *	pdc2027x_set_piomode - Initialize host controller PATA PIO timings
 *	@ap: Port to configure
 *	@adev: um
 *
 *	Set PIO mode for device.
 *
 *	LOCKING:
 *	None (inherited from caller).
 */

static void pdc2027x_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
	unsigned int pio = adev->pio_mode - XFER_PIO_0;
	u32 ctcr0, ctcr1;

	PDPRINTK("adev->pio_mode[%X]\n", adev->pio_mode);

	/* Sanity check */
	if (pio > 4) {
		printk(KERN_ERR DRV_NAME ": Unknown pio mode [%d] ignored\n", pio);
		return;

	}

	/* Set the PIO timing registers using value table for 133MHz */
	PDPRINTK("Set pio regs... \n");

	ctcr0 = ioread32(dev_mmio(ap, adev, PDC_CTCR0));
	ctcr0 &= 0xffff0000;
	ctcr0 |= pdc2027x_pio_timing_tbl[pio].value0 |
		(pdc2027x_pio_timing_tbl[pio].value1 << 8);
	iowrite32(ctcr0, dev_mmio(ap, adev, PDC_CTCR0));

	ctcr1 = ioread32(dev_mmio(ap, adev, PDC_CTCR1));
	ctcr1 &= 0x00ffffff;
	ctcr1 |= (pdc2027x_pio_timing_tbl[pio].value2 << 24);
	iowrite32(ctcr1, dev_mmio(ap, adev, PDC_CTCR1));

	PDPRINTK("Set pio regs done\n");

	PDPRINTK("Set to pio mode[%u] \n", pio);
}

/**
 *	pdc2027x_set_dmamode - Initialize host controller PATA UDMA timings
 *	@ap: Port to configure
 *	@adev: um
 *
 *	Set UDMA mode for device.
 *
 *	LOCKING:
 *	None (inherited from caller).
 */
static void pdc2027x_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
	unsigned int dma_mode = adev->dma_mode;
	u32 ctcr0, ctcr1;

	if ((dma_mode >= XFER_UDMA_0) &&
	   (dma_mode <= XFER_UDMA_6)) {
		/* Set the UDMA timing registers with value table for 133MHz */
		unsigned int udma_mode = dma_mode & 0x07;

		if (dma_mode == XFER_UDMA_2) {
			/*
			 * Turn off tHOLD.
			 * If tHOLD is '1', the hardware will add half clock for data hold time.
			 * This code segment seems to be no effect. tHOLD will be overwritten below.
			 */
			ctcr1 = ioread32(dev_mmio(ap, adev, PDC_CTCR1));
			iowrite32(ctcr1 & ~(1 << 7), dev_mmio(ap, adev, PDC_CTCR1));
		}

		PDPRINTK("Set udma regs... \n");

		ctcr1 = ioread32(dev_mmio(ap, adev, PDC_CTCR1));
		ctcr1 &= 0xff000000;
		ctcr1 |= pdc2027x_udma_timing_tbl[udma_mode].value0 |
			(pdc2027x_udma_timing_tbl[udma_mode].value1 << 8) |
			(pdc2027x_udma_timing_tbl[udma_mode].value2 << 16);
		iowrite32(ctcr1, dev_mmio(ap, adev, PDC_CTCR1));

		PDPRINTK("Set udma regs done\n");

		PDPRINTK("Set to udma mode[%u] \n", udma_mode);

	} else  if ((dma_mode >= XFER_MW_DMA_0) &&
		   (dma_mode <= XFER_MW_DMA_2)) {
		/* Set the MDMA timing registers with value table for 133MHz */
		unsigned int mdma_mode = dma_mode & 0x07;

		PDPRINTK("Set mdma regs... \n");
		ctcr0 = ioread32(dev_mmio(ap, adev, PDC_CTCR0));

		ctcr0 &= 0x0000ffff;
		ctcr0 |= (pdc2027x_mdma_timing_tbl[mdma_mode].value0 << 16) |
			(pdc2027x_mdma_timing_tbl[mdma_mode].value1 << 24);

		iowrite32(ctcr0, dev_mmio(ap, adev, PDC_CTCR0));
		PDPRINTK("Set mdma regs done\n");

		PDPRINTK("Set to mdma mode[%u] \n", mdma_mode);
	} else {
		printk(KERN_ERR DRV_NAME ": Unknown dma mode [%u] ignored\n", dma_mode);
	}
}

/**
 *	pdc2027x_set_mode - Set the timing registers back to correct values.
 *	@link: link to configure
 *	@r_failed: Returned device for failure
 *
 *	The pdc2027x hardware will look at "SET FEATURES" and change the timing registers
 *	automatically. The values set by the hardware might be incorrect, under 133Mhz PLL.
 *	This function overwrites the possibly incorrect values set by the hardware to be correct.
 */
static int pdc2027x_set_mode(struct ata_link *link, struct ata_device **r_failed)
{
	struct ata_port *ap = link->ap;
	struct ata_device *dev;
	int rc;

	rc = ata_do_set_mode(link, r_failed);
	if (rc < 0)
		return rc;

	ata_for_each_dev(dev, link, ENABLED) {
		pdc2027x_set_piomode(ap, dev);

		/*
		 * Enable prefetch if the device support PIO only.
		 */
		if (dev->xfer_shift == ATA_SHIFT_PIO) {
			u32 ctcr1 = ioread32(dev_mmio(ap, dev, PDC_CTCR1));
			ctcr1 |= (1 << 25);
			iowrite32(ctcr1, dev_mmio(ap, dev, PDC_CTCR1));

			PDPRINTK("Turn on prefetch\n");
		} else {
			pdc2027x_set_dmamode(ap, dev);
		}
	}
	return 0;
}

/**
 *	pdc2027x_check_atapi_dma - Check whether ATAPI DMA can be supported for this command
 *	@qc: Metadata associated with taskfile to check
 *
 *	LOCKING:
 *	None (inherited from caller).
 *
 *	RETURNS: 0 when ATAPI DMA can be used
 *		 1 otherwise
 */
static int pdc2027x_check_atapi_dma(struct ata_queued_cmd *qc)
{
	struct scsi_cmnd *cmd = qc->scsicmd;
	u8 *scsicmd = cmd->cmnd;
	int rc = 1; /* atapi dma off by default */

	/*
	 * This workaround is from Promise's GPL driver.
	 * If ATAPI DMA is used for commands not in the
	 * following white list, say MODE_SENSE and REQUEST_SENSE,
	 * pdc2027x might hit the irq lost problem.
	 */
	switch (scsicmd[0]) {
	case READ_10:
	case WRITE_10:
	case READ_12:
	case WRITE_12:
	case READ_6:
	case WRITE_6:
	case 0xad: /* READ_DVD_STRUCTURE */
	case 0xbe: /* READ_CD */
		/* ATAPI DMA is ok */
		rc = 0;
		break;
	default:
		;
	}

	return rc;
}

/**
 * pdc_read_counter - Read the ctr counter
 * @host: target ATA host
 */

static long pdc_read_counter(struct ata_host *host)
{
	void __iomem *mmio_base = host->iomap[PDC_MMIO_BAR];
	long counter;
	int retry = 1;
	u32 bccrl, bccrh, bccrlv, bccrhv;

retry:
	bccrl = ioread32(mmio_base + PDC_BYTE_COUNT) & 0x7fff;
	bccrh = ioread32(mmio_base + PDC_BYTE_COUNT + 0x100) & 0x7fff;

	/* Read the counter values again for verification */
	bccrlv = ioread32(mmio_base + PDC_BYTE_COUNT) & 0x7fff;
	bccrhv = ioread32(mmio_base + PDC_BYTE_COUNT + 0x100) & 0x7fff;

	counter = (bccrh << 15) | bccrl;

	PDPRINTK("bccrh [%X] bccrl [%X]\n", bccrh,  bccrl);
	PDPRINTK("bccrhv[%X] bccrlv[%X]\n", bccrhv, bccrlv);

	/*
	 * The 30-bit decreasing counter are read by 2 pieces.
	 * Incorrect value may be read when both bccrh and bccrl are changing.
	 * Ex. When 7900 decrease to 78FF, wrong value 7800 might be read.
	 */
	if (retry && !(bccrh == bccrhv && bccrl >= bccrlv)) {
		retry--;
		PDPRINTK("rereading counter\n");
		goto retry;
	}

	return counter;
}

/**
 * adjust_pll - Adjust the PLL input clock in Hz.
 *
 * @pdc_controller: controller specific information
 * @host: target ATA host
 * @pll_clock: The input of PLL in HZ
 */
static void pdc_adjust_pll(struct ata_host *host, long pll_clock, unsigned int board_idx)
{
	void __iomem *mmio_base = host->iomap[PDC_MMIO_BAR];
	u16 pll_ctl;
	long pll_clock_khz = pll_clock / 1000;
	long pout_required = board_idx? PDC_133_MHZ:PDC_100_MHZ;
	long ratio = pout_required / pll_clock_khz;
	int F, R;

	/* Sanity check */
	if (unlikely(pll_clock_khz < 5000L || pll_clock_khz > 70000L)) {
		printk(KERN_ERR DRV_NAME ": Invalid PLL input clock %ldkHz, give up!\n", pll_clock_khz);
		return;
	}

#ifdef PDC_DEBUG
	PDPRINTK("pout_required is %ld\n", pout_required);

	/* Show the current clock value of PLL control register
	 * (maybe already configured by the firmware)
	 */
	pll_ctl = ioread16(mmio_base + PDC_PLL_CTL);

	PDPRINTK("pll_ctl[%X]\n", pll_ctl);
#endif

	/*
	 * Calculate the ratio of F, R and OD
	 * POUT = (F + 2) / (( R + 2) * NO)
	 */
	if (ratio < 8600L) { /* 8.6x */
		/* Using NO = 0x01, R = 0x0D */
		R = 0x0d;
	} else if (ratio < 12900L) { /* 12.9x */
		/* Using NO = 0x01, R = 0x08 */
		R = 0x08;
	} else if (ratio < 16100L) { /* 16.1x */
		/* Using NO = 0x01, R = 0x06 */
		R = 0x06;
	} else if (ratio < 64000L) { /* 64x */
		R = 0x00;
	} else {
		/* Invalid ratio */
		printk(KERN_ERR DRV_NAME ": Invalid ratio %ld, give up!\n", ratio);
		return;
	}

	F = (ratio * (R+2)) / 1000 - 2;

	if (unlikely(F < 0 || F > 127)) {
		/* Invalid F */
		printk(KERN_ERR DRV_NAME ": F[%d] invalid!\n", F);
		return;
	}

	PDPRINTK("F[%d] R[%d] ratio*1000[%ld]\n", F, R, ratio);

	pll_ctl = (R << 8) | F;

	PDPRINTK("Writing pll_ctl[%X]\n", pll_ctl);

	iowrite16(pll_ctl, mmio_base + PDC_PLL_CTL);
	ioread16(mmio_base + PDC_PLL_CTL); /* flush */

	/* Wait the PLL circuit to be stable */
	mdelay(30);

#ifdef PDC_DEBUG
	/*
	 *  Show the current clock value of PLL control register
	 * (maybe configured by the firmware)
	 */
	pll_ctl = ioread16(mmio_base + PDC_PLL_CTL);

	PDPRINTK("pll_ctl[%X]\n", pll_ctl);
#endif

	return;
}

/**
 * detect_pll_input_clock - Detect the PLL input clock in Hz.
 * @host: target ATA host
 * Ex. 16949000 on 33MHz PCI bus for pdc20275.
 *     Half of the PCI clock.
 */
static long pdc_detect_pll_input_clock(struct ata_host *host)
{
	void __iomem *mmio_base = host->iomap[PDC_MMIO_BAR];
	u32 scr;
	long start_count, end_count;
	struct timeval start_time, end_time;
	long pll_clock, usec_elapsed;

	/* Start the test mode */
	scr = ioread32(mmio_base + PDC_SYS_CTL);
	PDPRINTK("scr[%X]\n", scr);
	iowrite32(scr | (0x01 << 14), mmio_base + PDC_SYS_CTL);
	ioread32(mmio_base + PDC_SYS_CTL); /* flush */

	/* Read current counter value */
	start_count = pdc_read_counter(host);
	do_gettimeofday(&start_time);

	/* Let the counter run for 100 ms. */
	mdelay(100);

	/* Read the counter values again */
	end_count = pdc_read_counter(host);
	do_gettimeofday(&end_time);

	/* Stop the test mode */
	scr = ioread32(mmio_base + PDC_SYS_CTL);
	PDPRINTK("scr[%X]\n", scr);
	iowrite32(scr & ~(0x01 << 14), mmio_base + PDC_SYS_CTL);
	ioread32(mmio_base + PDC_SYS_CTL); /* flush */

	/* calculate the input clock in Hz */
	usec_elapsed = (end_time.tv_sec - start_time.tv_sec) * 1000000 +
		(end_time.tv_usec - start_time.tv_usec);

	pll_clock = ((start_count - end_count) & 0x3fffffff) / 100 *
		(100000000 / usec_elapsed);

	PDPRINTK("start[%ld] end[%ld] \n", start_count, end_count);
	PDPRINTK("PLL input clock[%ld]Hz\n", pll_clock);

	return pll_clock;
}

/**
 * pdc_hardware_init - Initialize the hardware.
 * @host: target ATA host
 * @board_idx: board identifier
 */
static int pdc_hardware_init(struct ata_host *host, unsigned int board_idx)
{
	long pll_clock;

	/*
	 * Detect PLL input clock rate.
	 * On some system, where PCI bus is running at non-standard clock rate.
	 * Ex. 25MHz or 40MHz, we have to adjust the cycle_time.
	 * The pdc20275 controller employs PLL circuit to help correct timing registers setting.
	 */
	pll_clock = pdc_detect_pll_input_clock(host);

	dev_printk(KERN_INFO, host->dev, "PLL input clock %ld kHz\n", pll_clock/1000);

	/* Adjust PLL control register */
	pdc_adjust_pll(host, pll_clock, board_idx);

	return 0;
}

/**
 * pdc_ata_setup_port - setup the mmio address
 * @port: ata ioports to setup
 * @base: base address
 */
static void pdc_ata_setup_port(struct ata_ioports *port, void __iomem *base)
{
	port->cmd_addr		=
	port->data_addr		= base;
	port->feature_addr	=
	port->error_addr	= base + 0x05;
	port->nsect_addr	= base + 0x0a;
	port->lbal_addr		= base + 0x0f;
	port->lbam_addr		= base + 0x10;
	port->lbah_addr		= base + 0x15;
	port->device_addr	= base + 0x1a;
	port->command_addr	=
	port->status_addr	= base + 0x1f;
	port->altstatus_addr	=
	port->ctl_addr		= base + 0x81a;
}

/**
 * pdc2027x_init_one - PCI probe function
 * Called when an instance of PCI adapter is inserted.
 * This function checks whether the hardware is supported,
 * initialize hardware and register an instance of ata_host to
 * libata.  (implements struct pci_driver.probe() )
 *
 * @pdev: instance of pci_dev found
 * @ent:  matching entry in the id_tbl[]
 */
static int __devinit pdc2027x_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	static int printed_version;
	static const unsigned long cmd_offset[] = { 0x17c0, 0x15c0 };
	static const unsigned long bmdma_offset[] = { 0x1000, 0x1008 };
	unsigned int board_idx = (unsigned int) ent->driver_data;
	const struct ata_port_info *ppi[] =
		{ &pdc2027x_port_info[board_idx], NULL };
	struct ata_host *host;
	void __iomem *mmio_base;
	int i, rc;

	if (!printed_version++)
		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");

	/* alloc host */
	host = ata_host_alloc_pinfo(&pdev->dev, ppi, 2);
	if (!host)
		return -ENOMEM;

	/* acquire resources and fill host */
	rc = pcim_enable_device(pdev);
	if (rc)
		return rc;

	rc = pcim_iomap_regions(pdev, 1 << PDC_MMIO_BAR, DRV_NAME);
	if (rc)
		return rc;
	host->iomap = pcim_iomap_table(pdev);

	rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
	if (rc)
		return rc;

	rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
	if (rc)
		return rc;

	mmio_base = host->iomap[PDC_MMIO_BAR];

	for (i = 0; i < 2; i++) {
		struct ata_port *ap = host->ports[i];

		pdc_ata_setup_port(&ap->ioaddr, mmio_base + cmd_offset[i]);
		ap->ioaddr.bmdma_addr = mmio_base + bmdma_offset[i];

		ata_port_pbar_desc(ap, PDC_MMIO_BAR, -1, "mmio");
		ata_port_pbar_desc(ap, PDC_MMIO_BAR, cmd_offset[i], "cmd");
	}

	//pci_enable_intx(pdev);

	/* initialize adapter */
	if (pdc_hardware_init(host, board_idx) != 0)
		return -EIO;

	pci_set_master(pdev);
	return ata_host_activate(host, pdev->irq, ata_bmdma_interrupt,
				 IRQF_SHARED, &pdc2027x_sht);
}

/**
 * pdc2027x_init - Called after this module is loaded into the kernel.
 */
static int __init pdc2027x_init(void)
{
	return pci_register_driver(&pdc2027x_pci_driver);
}

/**
 * pdc2027x_exit - Called before this module unloaded from the kernel
 */
static void __exit pdc2027x_exit(void)
{
	pci_unregister_driver(&pdc2027x_pci_driver);
}

module_init(pdc2027x_init);
module_exit(pdc2027x_exit);