summaryrefslogtreecommitdiffstats
path: root/drivers/ata/pdc_adma.c
blob: fdad56c8662a33ea4c47d5fb3f6a749675425f1a (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
/*
 *  pdc_adma.c - Pacific Digital Corporation ADMA
 *
 *  Maintained by:  Mark Lord <mlord@pobox.com>
 *
 *  Copyright 2005 Mark Lord
 *
 *  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.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *
 *  Supports ATA disks in single-packet ADMA mode.
 *  Uses PIO for everything else.
 *
 *  TODO:  Use ADMA transfers for ATAPI devices, when possible.
 *  This requires careful attention to a number of quirks of the chip.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/gfp.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>

#define DRV_NAME	"pdc_adma"
#define DRV_VERSION	"1.0"

/* macro to calculate base address for ATA regs */
#define ADMA_ATA_REGS(base, port_no)	((base) + ((port_no) * 0x40))

/* macro to calculate base address for ADMA regs */
#define ADMA_REGS(base, port_no)	((base) + 0x80 + ((port_no) * 0x20))

/* macro to obtain addresses from ata_port */
#define ADMA_PORT_REGS(ap) \
	ADMA_REGS((ap)->host->iomap[ADMA_MMIO_BAR], ap->port_no)

enum {
	ADMA_MMIO_BAR		= 4,

	ADMA_PORTS		= 2,
	ADMA_CPB_BYTES		= 40,
	ADMA_PRD_BYTES		= LIBATA_MAX_PRD * 16,
	ADMA_PKT_BYTES		= ADMA_CPB_BYTES + ADMA_PRD_BYTES,

	ADMA_DMA_BOUNDARY	= 0xffffffff,

	/* global register offsets */
	ADMA_MODE_LOCK		= 0x00c7,

	/* per-channel register offsets */
	ADMA_CONTROL		= 0x0000, /* ADMA control */
	ADMA_STATUS		= 0x0002, /* ADMA status */
	ADMA_CPB_COUNT		= 0x0004, /* CPB count */
	ADMA_CPB_CURRENT	= 0x000c, /* current CPB address */
	ADMA_CPB_NEXT		= 0x000c, /* next CPB address */
	ADMA_CPB_LOOKUP		= 0x0010, /* CPB lookup table */
	ADMA_FIFO_IN		= 0x0014, /* input FIFO threshold */
	ADMA_FIFO_OUT		= 0x0016, /* output FIFO threshold */

	/* ADMA_CONTROL register bits */
	aNIEN			= (1 << 8), /* irq mask: 1==masked */
	aGO			= (1 << 7), /* packet trigger ("Go!") */
	aRSTADM			= (1 << 5), /* ADMA logic reset */
	aPIOMD4			= 0x0003,   /* PIO mode 4 */

	/* ADMA_STATUS register bits */
	aPSD			= (1 << 6),
	aUIRQ			= (1 << 4),
	aPERR			= (1 << 0),

	/* CPB bits */
	cDONE			= (1 << 0),
	cATERR			= (1 << 3),

	cVLD			= (1 << 0),
	cDAT			= (1 << 2),
	cIEN			= (1 << 3),

	/* PRD bits */
	pORD			= (1 << 4),
	pDIRO			= (1 << 5),
	pEND			= (1 << 7),

	/* ATA register flags */
	rIGN			= (1 << 5),
	rEND			= (1 << 7),

	/* ATA register addresses */
	ADMA_REGS_CONTROL	= 0x0e,
	ADMA_REGS_SECTOR_COUNT	= 0x12,
	ADMA_REGS_LBA_LOW	= 0x13,
	ADMA_REGS_LBA_MID	= 0x14,
	ADMA_REGS_LBA_HIGH	= 0x15,
	ADMA_REGS_DEVICE	= 0x16,
	ADMA_REGS_COMMAND	= 0x17,

	/* PCI device IDs */
	board_1841_idx		= 0,	/* ADMA 2-port controller */
};

typedef enum { adma_state_idle, adma_state_pkt, adma_state_mmio } adma_state_t;

struct adma_port_priv {
	u8			*pkt;
	dma_addr_t		pkt_dma;
	adma_state_t		state;
};

static int adma_ata_init_one(struct pci_dev *pdev,
				const struct pci_device_id *ent);
static int adma_port_start(struct ata_port *ap);
static void adma_port_stop(struct ata_port *ap);
static void adma_qc_prep(struct ata_queued_cmd *qc);
static unsigned int adma_qc_issue(struct ata_queued_cmd *qc);
static int adma_check_atapi_dma(struct ata_queued_cmd *qc);
static void adma_freeze(struct ata_port *ap);
static void adma_thaw(struct ata_port *ap);
static int adma_prereset(struct ata_link *link, unsigned long deadline);

static struct scsi_host_template adma_ata_sht = {
	ATA_BASE_SHT(DRV_NAME),
	.sg_tablesize		= LIBATA_MAX_PRD,
	.dma_boundary		= ADMA_DMA_BOUNDARY,
};

static struct ata_port_operations adma_ata_ops = {
	.inherits		= &ata_sff_port_ops,

	.lost_interrupt		= ATA_OP_NULL,

	.check_atapi_dma	= adma_check_atapi_dma,
	.qc_prep		= adma_qc_prep,
	.qc_issue		= adma_qc_issue,

	.freeze			= adma_freeze,
	.thaw			= adma_thaw,
	.prereset		= adma_prereset,

	.port_start		= adma_port_start,
	.port_stop		= adma_port_stop,
};

static struct ata_port_info adma_port_info[] = {
	/* board_1841_idx */
	{
		.flags		= ATA_FLAG_SLAVE_POSS | ATA_FLAG_PIO_POLLING,
		.pio_mask	= ATA_PIO4_ONLY,
		.udma_mask	= ATA_UDMA4,
		.port_ops	= &adma_ata_ops,
	},
};

static const struct pci_device_id adma_ata_pci_tbl[] = {
	{ PCI_VDEVICE(PDC, 0x1841), board_1841_idx },

	{ }	/* terminate list */
};

static struct pci_driver adma_ata_pci_driver = {
	.name			= DRV_NAME,
	.id_table		= adma_ata_pci_tbl,
	.probe			= adma_ata_init_one,
	.remove			= ata_pci_remove_one,
};

static int adma_check_atapi_dma(struct ata_queued_cmd *qc)
{
	return 1;	/* ATAPI DMA not yet supported */
}

static void adma_reset_engine(struct ata_port *ap)
{
	void __iomem *chan = ADMA_PORT_REGS(ap);

	/* reset ADMA to idle state */
	writew(aPIOMD4 | aNIEN | aRSTADM, chan + ADMA_CONTROL);
	udelay(2);
	writew(aPIOMD4, chan + ADMA_CONTROL);
	udelay(2);
}

static void adma_reinit_engine(struct ata_port *ap)
{
	struct adma_port_priv *pp = ap->private_data;
	void __iomem *chan = ADMA_PORT_REGS(ap);

	/* mask/clear ATA interrupts */
	writeb(ATA_NIEN, ap->ioaddr.ctl_addr);
	ata_sff_check_status(ap);

	/* reset the ADMA engine */
	adma_reset_engine(ap);

	/* set in-FIFO threshold to 0x100 */
	writew(0x100, chan + ADMA_FIFO_IN);

	/* set CPB pointer */
	writel((u32)pp->pkt_dma, chan + ADMA_CPB_NEXT);

	/* set out-FIFO threshold to 0x100 */
	writew(0x100, chan + ADMA_FIFO_OUT);

	/* set CPB count */
	writew(1, chan + ADMA_CPB_COUNT);

	/* read/discard ADMA status */
	readb(chan + ADMA_STATUS);
}

static inline void adma_enter_reg_mode(struct ata_port *ap)
{
	void __iomem *chan = ADMA_PORT_REGS(ap);

	writew(aPIOMD4, chan + ADMA_CONTROL);
	readb(chan + ADMA_STATUS);	/* flush */
}

static void adma_freeze(struct ata_port *ap)
{
	void __iomem *chan = ADMA_PORT_REGS(ap);

	/* mask/clear ATA interrupts */
	writeb(ATA_NIEN, ap->ioaddr.ctl_addr);
	ata_sff_check_status(ap);

	/* reset ADMA to idle state */
	writew(aPIOMD4 | aNIEN | aRSTADM, chan + ADMA_CONTROL);
	udelay(2);
	writew(aPIOMD4 | aNIEN, chan + ADMA_CONTROL);
	udelay(2);
}

static void adma_thaw(struct ata_port *ap)
{
	adma_reinit_engine(ap);
}

static int adma_prereset(struct ata_link *link, unsigned long deadline)
{
	struct ata_port *ap = link->ap;
	struct adma_port_priv *pp = ap->private_data;

	if (pp->state != adma_state_idle) /* healthy paranoia */
		pp->state = adma_state_mmio;
	adma_reinit_engine(ap);

	return ata_sff_prereset(link, deadline);
}

static int adma_fill_sg(struct ata_queued_cmd *qc)
{
	struct scatterlist *sg;
	struct ata_port *ap = qc->ap;
	struct adma_port_priv *pp = ap->private_data;
	u8  *buf = pp->pkt, *last_buf = NULL;
	int i = (2 + buf[3]) * 8;
	u8 pFLAGS = pORD | ((qc->tf.flags & ATA_TFLAG_WRITE) ? pDIRO : 0);
	unsigned int si;

	for_each_sg(qc->sg, sg, qc->n_elem, si) {
		u32 addr;
		u32 len;

		addr = (u32)sg_dma_address(sg);
		*(__le32 *)(buf + i) = cpu_to_le32(addr);
		i += 4;

		len = sg_dma_len(sg) >> 3;
		*(__le32 *)(buf + i) = cpu_to_le32(len);
		i += 4;

		last_buf = &buf[i];
		buf[i++] = pFLAGS;
		buf[i++] = qc->dev->dma_mode & 0xf;
		buf[i++] = 0;	/* pPKLW */
		buf[i++] = 0;	/* reserved */

		*(__le32 *)(buf + i) =
			(pFLAGS & pEND) ? 0 : cpu_to_le32(pp->pkt_dma + i + 4);
		i += 4;

		VPRINTK("PRD[%u] = (0x%lX, 0x%X)\n", i/4,
					(unsigned long)addr, len);
	}

	if (likely(last_buf))
		*last_buf |= pEND;

	return i;
}

static void adma_qc_prep(struct ata_queued_cmd *qc)
{
	struct adma_port_priv *pp = qc->ap->private_data;
	u8  *buf = pp->pkt;
	u32 pkt_dma = (u32)pp->pkt_dma;
	int i = 0;

	VPRINTK("ENTER\n");

	adma_enter_reg_mode(qc->ap);
	if (qc->tf.protocol != ATA_PROT_DMA)
		return;

	buf[i++] = 0;	/* Response flags */
	buf[i++] = 0;	/* reserved */
	buf[i++] = cVLD | cDAT | cIEN;
	i++;		/* cLEN, gets filled in below */

	*(__le32 *)(buf+i) = cpu_to_le32(pkt_dma);	/* cNCPB */
	i += 4;		/* cNCPB */
	i += 4;		/* cPRD, gets filled in below */

	buf[i++] = 0;	/* reserved */
	buf[i++] = 0;	/* reserved */
	buf[i++] = 0;	/* reserved */
	buf[i++] = 0;	/* reserved */

	/* ATA registers; must be a multiple of 4 */
	buf[i++] = qc->tf.device;
	buf[i++] = ADMA_REGS_DEVICE;
	if ((qc->tf.flags & ATA_TFLAG_LBA48)) {
		buf[i++] = qc->tf.hob_nsect;
		buf[i++] = ADMA_REGS_SECTOR_COUNT;
		buf[i++] = qc->tf.hob_lbal;
		buf[i++] = ADMA_REGS_LBA_LOW;
		buf[i++] = qc->tf.hob_lbam;
		buf[i++] = ADMA_REGS_LBA_MID;
		buf[i++] = qc->tf.hob_lbah;
		buf[i++] = ADMA_REGS_LBA_HIGH;
	}
	buf[i++] = qc->tf.nsect;
	buf[i++] = ADMA_REGS_SECTOR_COUNT;
	buf[i++] = qc->tf.lbal;
	buf[i++] = ADMA_REGS_LBA_LOW;
	buf[i++] = qc->tf.lbam;
	buf[i++] = ADMA_REGS_LBA_MID;
	buf[i++] = qc->tf.lbah;
	buf[i++] = ADMA_REGS_LBA_HIGH;
	buf[i++] = 0;
	buf[i++] = ADMA_REGS_CONTROL;
	buf[i++] = rIGN;
	buf[i++] = 0;
	buf[i++] = qc->tf.command;
	buf[i++] = ADMA_REGS_COMMAND | rEND;

	buf[3] = (i >> 3) - 2;				/* cLEN */
	*(__le32 *)(buf+8) = cpu_to_le32(pkt_dma + i);	/* cPRD */

	i = adma_fill_sg(qc);
	wmb();	/* flush PRDs and pkt to memory */
#if 0
	/* dump out CPB + PRDs for debug */
	{
		int j, len = 0;
		static char obuf[2048];
		for (j = 0; j < i; ++j) {
			len += sprintf(obuf+len, "%02x ", buf[j]);
			if ((j & 7) == 7) {
				printk("%s\n", obuf);
				len = 0;
			}
		}
		if (len)
			printk("%s\n", obuf);
	}
#endif
}

static inline void adma_packet_start(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	void __iomem *chan = ADMA_PORT_REGS(ap);

	VPRINTK("ENTER, ap %p\n", ap);

	/* fire up the ADMA engine */
	writew(aPIOMD4 | aGO, chan + ADMA_CONTROL);
}

static unsigned int adma_qc_issue(struct ata_queued_cmd *qc)
{
	struct adma_port_priv *pp = qc->ap->private_data;

	switch (qc->tf.protocol) {
	case ATA_PROT_DMA:
		pp->state = adma_state_pkt;
		adma_packet_start(qc);
		return 0;

	case ATAPI_PROT_DMA:
		BUG();
		break;

	default:
		break;
	}

	pp->state = adma_state_mmio;
	return ata_sff_qc_issue(qc);
}

static inline unsigned int adma_intr_pkt(struct ata_host *host)
{
	unsigned int handled = 0, port_no;

	for (port_no = 0; port_no < host->n_ports; ++port_no) {
		struct ata_port *ap = host->ports[port_no];
		struct adma_port_priv *pp;
		struct ata_queued_cmd *qc;
		void __iomem *chan = ADMA_PORT_REGS(ap);
		u8 status = readb(chan + ADMA_STATUS);

		if (status == 0)
			continue;
		handled = 1;
		adma_enter_reg_mode(ap);
		pp = ap->private_data;
		if (!pp || pp->state != adma_state_pkt)
			continue;
		qc = ata_qc_from_tag(ap, ap->link.active_tag);
		if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
			if (status & aPERR)
				qc->err_mask |= AC_ERR_HOST_BUS;
			else if ((status & (aPSD | aUIRQ)))
				qc->err_mask |= AC_ERR_OTHER;

			if (pp->pkt[0] & cATERR)
				qc->err_mask |= AC_ERR_DEV;
			else if (pp->pkt[0] != cDONE)
				qc->err_mask |= AC_ERR_OTHER;

			if (!qc->err_mask)
				ata_qc_complete(qc);
			else {
				struct ata_eh_info *ehi = &ap->link.eh_info;
				ata_ehi_clear_desc(ehi);
				ata_ehi_push_desc(ehi,
					"ADMA-status 0x%02X", status);
				ata_ehi_push_desc(ehi,
					"pkt[0] 0x%02X", pp->pkt[0]);

				if (qc->err_mask == AC_ERR_DEV)
					ata_port_abort(ap);
				else
					ata_port_freeze(ap);
			}
		}
	}
	return handled;
}

static inline unsigned int adma_intr_mmio(struct ata_host *host)
{
	unsigned int handled = 0, port_no;

	for (port_no = 0; port_no < host->n_ports; ++port_no) {
		struct ata_port *ap = host->ports[port_no];
		struct adma_port_priv *pp = ap->private_data;
		struct ata_queued_cmd *qc;

		if (!pp || pp->state != adma_state_mmio)
			continue;
		qc = ata_qc_from_tag(ap, ap->link.active_tag);
		if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {

			/* check main status, clearing INTRQ */
			u8 status = ata_sff_check_status(ap);
			if ((status & ATA_BUSY))
				continue;
			DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
				ap->print_id, qc->tf.protocol, status);

			/* complete taskfile transaction */
			pp->state = adma_state_idle;
			qc->err_mask |= ac_err_mask(status);
			if (!qc->err_mask)
				ata_qc_complete(qc);
			else {
				struct ata_eh_info *ehi = &ap->link.eh_info;
				ata_ehi_clear_desc(ehi);
				ata_ehi_push_desc(ehi, "status 0x%02X", status);

				if (qc->err_mask == AC_ERR_DEV)
					ata_port_abort(ap);
				else
					ata_port_freeze(ap);
			}
			handled = 1;
		}
	}
	return handled;
}

static irqreturn_t adma_intr(int irq, void *dev_instance)
{
	struct ata_host *host = dev_instance;
	unsigned int handled = 0;

	VPRINTK("ENTER\n");

	spin_lock(&host->lock);
	handled  = adma_intr_pkt(host) | adma_intr_mmio(host);
	spin_unlock(&host->lock);

	VPRINTK("EXIT\n");

	return IRQ_RETVAL(handled);
}

static void adma_ata_setup_port(struct ata_ioports *port, void __iomem *base)
{
	port->cmd_addr		=
	port->data_addr		= base + 0x000;
	port->error_addr	=
	port->feature_addr	= base + 0x004;
	port->nsect_addr	= base + 0x008;
	port->lbal_addr		= base + 0x00c;
	port->lbam_addr		= base + 0x010;
	port->lbah_addr		= base + 0x014;
	port->device_addr	= base + 0x018;
	port->status_addr	=
	port->command_addr	= base + 0x01c;
	port->altstatus_addr	=
	port->ctl_addr		= base + 0x038;
}

static int adma_port_start(struct ata_port *ap)
{
	struct device *dev = ap->host->dev;
	struct adma_port_priv *pp;

	adma_enter_reg_mode(ap);
	pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
	if (!pp)
		return -ENOMEM;
	pp->pkt = dmam_alloc_coherent(dev, ADMA_PKT_BYTES, &pp->pkt_dma,
				      GFP_KERNEL);
	if (!pp->pkt)
		return -ENOMEM;
	/* paranoia? */
	if ((pp->pkt_dma & 7) != 0) {
		printk(KERN_ERR "bad alignment for pp->pkt_dma: %08x\n",
						(u32)pp->pkt_dma);
		return -ENOMEM;
	}
	memset(pp->pkt, 0, ADMA_PKT_BYTES);
	ap->private_data = pp;
	adma_reinit_engine(ap);
	return 0;
}

static void adma_port_stop(struct ata_port *ap)
{
	adma_reset_engine(ap);
}

static void adma_host_init(struct ata_host *host, unsigned int chip_id)
{
	unsigned int port_no;

	/* enable/lock aGO operation */
	writeb(7, host->iomap[ADMA_MMIO_BAR] + ADMA_MODE_LOCK);

	/* reset the ADMA logic */
	for (port_no = 0; port_no < ADMA_PORTS; ++port_no)
		adma_reset_engine(host->ports[port_no]);
}

static int adma_set_dma_masks(struct pci_dev *pdev, void __iomem *mmio_base)
{
	int rc;

	rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
	if (rc) {
		dev_err(&pdev->dev, "32-bit DMA enable failed\n");
		return rc;
	}
	rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
	if (rc) {
		dev_err(&pdev->dev, "32-bit consistent DMA enable failed\n");
		return rc;
	}
	return 0;
}

static int adma_ata_init_one(struct pci_dev *pdev,
			     const struct pci_device_id *ent)
{
	static int printed_version;
	unsigned int board_idx = (unsigned int) ent->driver_data;
	const struct ata_port_info *ppi[] = { &adma_port_info[board_idx], NULL };
	struct ata_host *host;
	void __iomem *mmio_base;
	int rc, port_no;

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

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

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

	if ((pci_resource_flags(pdev, 4) & IORESOURCE_MEM) == 0)
		return -ENODEV;

	rc = pcim_iomap_regions(pdev, 1 << ADMA_MMIO_BAR, DRV_NAME);
	if (rc)
		return rc;
	host->iomap = pcim_iomap_table(pdev);
	mmio_base = host->iomap[ADMA_MMIO_BAR];

	rc = adma_set_dma_masks(pdev, mmio_base);
	if (rc)
		return rc;

	for (port_no = 0; port_no < ADMA_PORTS; ++port_no) {
		struct ata_port *ap = host->ports[port_no];
		void __iomem *port_base = ADMA_ATA_REGS(mmio_base, port_no);
		unsigned int offset = port_base - mmio_base;

		adma_ata_setup_port(&ap->ioaddr, port_base);

		ata_port_pbar_desc(ap, ADMA_MMIO_BAR, -1, "mmio");
		ata_port_pbar_desc(ap, ADMA_MMIO_BAR, offset, "port");
	}

	/* initialize adapter */
	adma_host_init(host, board_idx);

	pci_set_master(pdev);
	return ata_host_activate(host, pdev->irq, adma_intr, IRQF_SHARED,
				 &adma_ata_sht);
}

static int __init adma_ata_init(void)
{
	return pci_register_driver(&adma_ata_pci_driver);
}

static void __exit adma_ata_exit(void)
{
	pci_unregister_driver(&adma_ata_pci_driver);
}

MODULE_AUTHOR("Mark Lord");
MODULE_DESCRIPTION("Pacific Digital Corporation ADMA low-level driver");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, adma_ata_pci_tbl);
MODULE_VERSION(DRV_VERSION);

module_init(adma_ata_init);
module_exit(adma_ata_exit);