summaryrefslogtreecommitdiff
path: root/drivers/ata/sata_inic162x.c
blob: e4513174824830fa67d3e000ec97a449245fb0c8 (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
/*
 * sata_inic162x.c - Driver for Initio 162x SATA controllers
 *
 * Copyright 2006  SUSE Linux Products GmbH
 * Copyright 2006  Tejun Heo <teheo@novell.com>
 *
 * This file is released under GPL v2.
 *
 * This controller is eccentric and easily locks up if something isn't
 * right.  Documentation is available at initio's website but it only
 * documents registers (not programming model).
 *
 * This driver has interesting history.  The first version was written
 * from the documentation and a 2.4 IDE driver posted on a Taiwan
 * company, which didn't use any IDMA features and couldn't handle
 * LBA48.  The resulting driver couldn't handle LBA48 devices either
 * making it pretty useless.
 *
 * After a while, initio picked the driver up, renamed it to
 * sata_initio162x, updated it to use IDMA for ATA DMA commands and
 * posted it on their website.  It only used ATA_PROT_DMA for IDMA and
 * attaching both devices and issuing IDMA and !IDMA commands
 * simultaneously broke it due to PIRQ masking interaction but it did
 * show how to use the IDMA (ADMA + some initio specific twists)
 * engine.
 *
 * Then, I picked up their changes again and here's the usable driver
 * which uses IDMA for everything.  Everything works now including
 * LBA48, CD/DVD burning, suspend/resume and hotplug.  There are some
 * issues tho.  Result Tf is not resported properly, NCQ isn't
 * supported yet and CD/DVD writing works with DMA assisted PIO
 * protocol (which, for native SATA devices, shouldn't cause any
 * noticeable difference).
 *
 * Anyways, so, here's finally a working driver for inic162x.  Enjoy!
 *
 * initio: If you guys wanna improve the driver regarding result TF
 * access and other stuff, please feel free to contact me.  I'll be
 * happy to assist.
 */

#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <linux/blkdev.h>
#include <scsi/scsi_device.h>

#define DRV_NAME	"sata_inic162x"
#define DRV_VERSION	"0.4"

enum {
	MMIO_BAR_PCI		= 5,
	MMIO_BAR_CARDBUS	= 1,

	NR_PORTS		= 2,

	IDMA_CPB_TBL_SIZE	= 4 * 32,

	INIC_DMA_BOUNDARY	= 0xffffff,

	HOST_ACTRL		= 0x08,
	HOST_CTL		= 0x7c,
	HOST_STAT		= 0x7e,
	HOST_IRQ_STAT		= 0xbc,
	HOST_IRQ_MASK		= 0xbe,

	PORT_SIZE		= 0x40,

	/* registers for ATA TF operation */
	PORT_TF_DATA		= 0x00,
	PORT_TF_FEATURE		= 0x01,
	PORT_TF_NSECT		= 0x02,
	PORT_TF_LBAL		= 0x03,
	PORT_TF_LBAM		= 0x04,
	PORT_TF_LBAH		= 0x05,
	PORT_TF_DEVICE		= 0x06,
	PORT_TF_COMMAND		= 0x07,
	PORT_TF_ALT_STAT	= 0x08,
	PORT_IRQ_STAT		= 0x09,
	PORT_IRQ_MASK		= 0x0a,
	PORT_PRD_CTL		= 0x0b,
	PORT_PRD_ADDR		= 0x0c,
	PORT_PRD_XFERLEN	= 0x10,
	PORT_CPB_CPBLAR		= 0x18,
	PORT_CPB_PTQFIFO	= 0x1c,

	/* IDMA register */
	PORT_IDMA_CTL		= 0x14,
	PORT_IDMA_STAT		= 0x16,

	PORT_RPQ_FIFO		= 0x1e,
	PORT_RPQ_CNT		= 0x1f,

	PORT_SCR		= 0x20,

	/* HOST_CTL bits */
	HCTL_LEDEN		= (1 << 3),  /* enable LED operation */
	HCTL_IRQOFF		= (1 << 8),  /* global IRQ off */
	HCTL_FTHD0		= (1 << 10), /* fifo threshold 0 */
	HCTL_FTHD1		= (1 << 11), /* fifo threshold 1*/
	HCTL_PWRDWN		= (1 << 12), /* power down PHYs */
	HCTL_SOFTRST		= (1 << 13), /* global reset (no phy reset) */
	HCTL_RPGSEL		= (1 << 15), /* register page select */

	HCTL_KNOWN_BITS		= HCTL_IRQOFF | HCTL_PWRDWN | HCTL_SOFTRST |
				  HCTL_RPGSEL,

	/* HOST_IRQ_(STAT|MASK) bits */
	HIRQ_PORT0		= (1 << 0),
	HIRQ_PORT1		= (1 << 1),
	HIRQ_SOFT		= (1 << 14),
	HIRQ_GLOBAL		= (1 << 15), /* STAT only */

	/* PORT_IRQ_(STAT|MASK) bits */
	PIRQ_OFFLINE		= (1 << 0),  /* device unplugged */
	PIRQ_ONLINE		= (1 << 1),  /* device plugged */
	PIRQ_COMPLETE		= (1 << 2),  /* completion interrupt */
	PIRQ_FATAL		= (1 << 3),  /* fatal error */
	PIRQ_ATA		= (1 << 4),  /* ATA interrupt */
	PIRQ_REPLY		= (1 << 5),  /* reply FIFO not empty */
	PIRQ_PENDING		= (1 << 7),  /* port IRQ pending (STAT only) */

	PIRQ_ERR		= PIRQ_OFFLINE | PIRQ_ONLINE | PIRQ_FATAL,
	PIRQ_MASK_DEFAULT	= PIRQ_REPLY | PIRQ_ATA,
	PIRQ_MASK_FREEZE	= 0xff,

	/* PORT_PRD_CTL bits */
	PRD_CTL_START		= (1 << 0),
	PRD_CTL_WR		= (1 << 3),
	PRD_CTL_DMAEN		= (1 << 7),  /* DMA enable */

	/* PORT_IDMA_CTL bits */
	IDMA_CTL_RST_ATA	= (1 << 2),  /* hardreset ATA bus */
	IDMA_CTL_RST_IDMA	= (1 << 5),  /* reset IDMA machinary */
	IDMA_CTL_GO		= (1 << 7),  /* IDMA mode go */
	IDMA_CTL_ATA_NIEN	= (1 << 8),  /* ATA IRQ disable */

	/* PORT_IDMA_STAT bits */
	IDMA_STAT_PERR		= (1 << 0),  /* PCI ERROR MODE */
	IDMA_STAT_CPBERR	= (1 << 1),  /* ADMA CPB error */
	IDMA_STAT_LGCY		= (1 << 3),  /* ADMA legacy */
	IDMA_STAT_UIRQ		= (1 << 4),  /* ADMA unsolicited irq */
	IDMA_STAT_STPD		= (1 << 5),  /* ADMA stopped */
	IDMA_STAT_PSD		= (1 << 6),  /* ADMA pause */
	IDMA_STAT_DONE		= (1 << 7),  /* ADMA done */

	IDMA_STAT_ERR		= IDMA_STAT_PERR | IDMA_STAT_CPBERR,

	/* CPB Control Flags*/
	CPB_CTL_VALID		= (1 << 0),  /* CPB valid */
	CPB_CTL_QUEUED		= (1 << 1),  /* queued command */
	CPB_CTL_DATA		= (1 << 2),  /* data, rsvd in datasheet */
	CPB_CTL_IEN		= (1 << 3),  /* PCI interrupt enable */
	CPB_CTL_DEVDIR		= (1 << 4),  /* device direction control */

	/* CPB Response Flags */
	CPB_RESP_DONE		= (1 << 0),  /* ATA command complete */
	CPB_RESP_REL		= (1 << 1),  /* ATA release */
	CPB_RESP_IGNORED	= (1 << 2),  /* CPB ignored */
	CPB_RESP_ATA_ERR	= (1 << 3),  /* ATA command error */
	CPB_RESP_SPURIOUS	= (1 << 4),  /* ATA spurious interrupt error */
	CPB_RESP_UNDERFLOW	= (1 << 5),  /* APRD deficiency length error */
	CPB_RESP_OVERFLOW	= (1 << 6),  /* APRD exccess length error */
	CPB_RESP_CPB_ERR	= (1 << 7),  /* CPB error flag */

	/* PRD Control Flags */
	PRD_DRAIN		= (1 << 1),  /* ignore data excess */
	PRD_CDB			= (1 << 2),  /* atapi packet command pointer */
	PRD_DIRECT_INTR		= (1 << 3),  /* direct interrupt */
	PRD_DMA			= (1 << 4),  /* data transfer method */
	PRD_WRITE		= (1 << 5),  /* data dir, rsvd in datasheet */
	PRD_IOM			= (1 << 6),  /* io/memory transfer */
	PRD_END			= (1 << 7),  /* APRD chain end */
};

/* Comman Parameter Block */
struct inic_cpb {
	u8		resp_flags;	/* Response Flags */
	u8		error;		/* ATA Error */
	u8		status;		/* ATA Status */
	u8		ctl_flags;	/* Control Flags */
	__le32		len;		/* Total Transfer Length */
	__le32		prd;		/* First PRD pointer */
	u8		rsvd[4];
	/* 16 bytes */
	u8		feature;	/* ATA Feature */
	u8		hob_feature;	/* ATA Ex. Feature */
	u8		device;		/* ATA Device/Head */
	u8		mirctl;		/* Mirror Control */
	u8		nsect;		/* ATA Sector Count */
	u8		hob_nsect;	/* ATA Ex. Sector Count */
	u8		lbal;		/* ATA Sector Number */
	u8		hob_lbal;	/* ATA Ex. Sector Number */
	u8		lbam;		/* ATA Cylinder Low */
	u8		hob_lbam;	/* ATA Ex. Cylinder Low */
	u8		lbah;		/* ATA Cylinder High */
	u8		hob_lbah;	/* ATA Ex. Cylinder High */
	u8		command;	/* ATA Command */
	u8		ctl;		/* ATA Control */
	u8		slave_error;	/* Slave ATA Error */
	u8		slave_status;	/* Slave ATA Status */
	/* 32 bytes */
} __packed;

/* Physical Region Descriptor */
struct inic_prd {
	__le32		mad;		/* Physical Memory Address */
	__le16		len;		/* Transfer Length */
	u8		rsvd;
	u8		flags;		/* Control Flags */
} __packed;

struct inic_pkt {
	struct inic_cpb	cpb;
	struct inic_prd	prd[LIBATA_MAX_PRD + 1];	/* + 1 for cdb */
	u8		cdb[ATAPI_CDB_LEN];
} __packed;

struct inic_host_priv {
	void __iomem	*mmio_base;
	u16		cached_hctl;
};

struct inic_port_priv {
	struct inic_pkt	*pkt;
	dma_addr_t	pkt_dma;
	u32		*cpb_tbl;
	dma_addr_t	cpb_tbl_dma;
};

static struct scsi_host_template inic_sht = {
	ATA_BASE_SHT(DRV_NAME),
	.sg_tablesize	= LIBATA_MAX_PRD,	/* maybe it can be larger? */
	.dma_boundary	= INIC_DMA_BOUNDARY,
};

static const int scr_map[] = {
	[SCR_STATUS]	= 0,
	[SCR_ERROR]	= 1,
	[SCR_CONTROL]	= 2,
};

static void __iomem *inic_port_base(struct ata_port *ap)
{
	struct inic_host_priv *hpriv = ap->host->private_data;

	return hpriv->mmio_base + ap->port_no * PORT_SIZE;
}

static void inic_reset_port(void __iomem *port_base)
{
	void __iomem *idma_ctl = port_base + PORT_IDMA_CTL;

	/* stop IDMA engine */
	readw(idma_ctl); /* flush */
	msleep(1);

	/* mask IRQ and assert reset */
	writew(IDMA_CTL_RST_IDMA, idma_ctl);
	readw(idma_ctl); /* flush */
	msleep(1);

	/* release reset */
	writew(0, idma_ctl);

	/* clear irq */
	writeb(0xff, port_base + PORT_IRQ_STAT);
}

static int inic_scr_read(struct ata_link *link, unsigned sc_reg, u32 *val)
{
	void __iomem *scr_addr = inic_port_base(link->ap) + PORT_SCR;

	if (unlikely(sc_reg >= ARRAY_SIZE(scr_map)))
		return -EINVAL;

	*val = readl(scr_addr + scr_map[sc_reg] * 4);

	/* this controller has stuck DIAG.N, ignore it */
	if (sc_reg == SCR_ERROR)
		*val &= ~SERR_PHYRDY_CHG;
	return 0;
}

static int inic_scr_write(struct ata_link *link, unsigned sc_reg, u32 val)
{
	void __iomem *scr_addr = inic_port_base(link->ap) + PORT_SCR;

	if (unlikely(sc_reg >= ARRAY_SIZE(scr_map)))
		return -EINVAL;

	writel(val, scr_addr + scr_map[sc_reg] * 4);
	return 0;
}

static void inic_stop_idma(struct ata_port *ap)
{
	void __iomem *port_base = inic_port_base(ap);

	readb(port_base + PORT_RPQ_FIFO);
	readb(port_base + PORT_RPQ_CNT);
	writew(0, port_base + PORT_IDMA_CTL);
}

static void inic_host_err_intr(struct ata_port *ap, u8 irq_stat, u16 idma_stat)
{
	struct ata_eh_info *ehi = &ap->link.eh_info;
	struct inic_port_priv *pp = ap->private_data;
	struct inic_cpb *cpb = &pp->pkt->cpb;
	bool freeze = false;

	ata_ehi_clear_desc(ehi);
	ata_ehi_push_desc(ehi, "irq_stat=0x%x idma_stat=0x%x",
			  irq_stat, idma_stat);

	inic_stop_idma(ap);

	if (irq_stat & (PIRQ_OFFLINE | PIRQ_ONLINE)) {
		ata_ehi_push_desc(ehi, "hotplug");
		ata_ehi_hotplugged(ehi);
		freeze = true;
	}

	if (idma_stat & IDMA_STAT_PERR) {
		ata_ehi_push_desc(ehi, "PCI error");
		freeze = true;
	}

	if (idma_stat & IDMA_STAT_CPBERR) {
		ata_ehi_push_desc(ehi, "CPB error");

		if (cpb->resp_flags & CPB_RESP_IGNORED) {
			__ata_ehi_push_desc(ehi, " ignored");
			ehi->err_mask |= AC_ERR_INVALID;
			freeze = true;
		}

		if (cpb->resp_flags & CPB_RESP_ATA_ERR)
			ehi->err_mask |= AC_ERR_DEV;

		if (cpb->resp_flags & CPB_RESP_SPURIOUS) {
			__ata_ehi_push_desc(ehi, " spurious-intr");
			ehi->err_mask |= AC_ERR_HSM;
			freeze = true;
		}

		if (cpb->resp_flags &
		    (CPB_RESP_UNDERFLOW | CPB_RESP_OVERFLOW)) {
			__ata_ehi_push_desc(ehi, " data-over/underflow");
			ehi->err_mask |= AC_ERR_HSM;
			freeze = true;
		}
	}

	if (freeze)
		ata_port_freeze(ap);
	else
		ata_port_abort(ap);
}

static void inic_host_intr(struct ata_port *ap)
{
	void __iomem *port_base = inic_port_base(ap);
	struct ata_queued_cmd *qc = ata_qc_from_tag(ap, ap->link.active_tag);
	u8 irq_stat;
	u16 idma_stat;

	/* read and clear IRQ status */
	irq_stat = readb(port_base + PORT_IRQ_STAT);
	writeb(irq_stat, port_base + PORT_IRQ_STAT);
	idma_stat = readw(port_base + PORT_IDMA_STAT);

	if (unlikely((irq_stat & PIRQ_ERR) || (idma_stat & IDMA_STAT_ERR)))
		inic_host_err_intr(ap, irq_stat, idma_stat);

	if (unlikely(!qc))
		goto spurious;

	if (likely(idma_stat & IDMA_STAT_DONE)) {
		inic_stop_idma(ap);

		/* Depending on circumstances, device error
		 * isn't reported by IDMA, check it explicitly.
		 */
		if (unlikely(readb(port_base + PORT_TF_COMMAND) &
			     (ATA_DF | ATA_ERR)))
			qc->err_mask |= AC_ERR_DEV;

		ata_qc_complete(qc);
		return;
	}

 spurious:
	ata_port_warn(ap, "unhandled interrupt: cmd=0x%x irq_stat=0x%x idma_stat=0x%x\n",
		      qc ? qc->tf.command : 0xff, irq_stat, idma_stat);
}

static irqreturn_t inic_interrupt(int irq, void *dev_instance)
{
	struct ata_host *host = dev_instance;
	struct inic_host_priv *hpriv = host->private_data;
	u16 host_irq_stat;
	int i, handled = 0;

	host_irq_stat = readw(hpriv->mmio_base + HOST_IRQ_STAT);

	if (unlikely(!(host_irq_stat & HIRQ_GLOBAL)))
		goto out;

	spin_lock(&host->lock);

	for (i = 0; i < NR_PORTS; i++)
		if (host_irq_stat & (HIRQ_PORT0 << i)) {
			inic_host_intr(host->ports[i]);
			handled++;
		}

	spin_unlock(&host->lock);

 out:
	return IRQ_RETVAL(handled);
}

static int inic_check_atapi_dma(struct ata_queued_cmd *qc)
{
	/* For some reason ATAPI_PROT_DMA doesn't work for some
	 * commands including writes and other misc ops.  Use PIO
	 * protocol instead, which BTW is driven by the DMA engine
	 * anyway, so it shouldn't make much difference for native
	 * SATA devices.
	 */
	if (atapi_cmd_type(qc->cdb[0]) == READ)
		return 0;
	return 1;
}

static void inic_fill_sg(struct inic_prd *prd, struct ata_queued_cmd *qc)
{
	struct scatterlist *sg;
	unsigned int si;
	u8 flags = 0;

	if (qc->tf.flags & ATA_TFLAG_WRITE)
		flags |= PRD_WRITE;

	if (ata_is_dma(qc->tf.protocol))
		flags |= PRD_DMA;

	for_each_sg(qc->sg, sg, qc->n_elem, si) {
		prd->mad = cpu_to_le32(sg_dma_address(sg));
		prd->len = cpu_to_le16(sg_dma_len(sg));
		prd->flags = flags;
		prd++;
	}

	WARN_ON(!si);
	prd[-1].flags |= PRD_END;
}

static void inic_qc_prep(struct ata_queued_cmd *qc)
{
	struct inic_port_priv *pp = qc->ap->private_data;
	struct inic_pkt *pkt = pp->pkt;
	struct inic_cpb *cpb = &pkt->cpb;
	struct inic_prd *prd = pkt->prd;
	bool is_atapi = ata_is_atapi(qc->tf.protocol);
	bool is_data = ata_is_data(qc->tf.protocol);
	unsigned int cdb_len = 0;

	VPRINTK("ENTER\n");

	if (is_atapi)
		cdb_len = qc->dev->cdb_len;

	/* prepare packet, based on initio driver */
	memset(pkt, 0, sizeof(struct inic_pkt));

	cpb->ctl_flags = CPB_CTL_VALID | CPB_CTL_IEN;
	if (is_atapi || is_data)
		cpb->ctl_flags |= CPB_CTL_DATA;

	cpb->len = cpu_to_le32(qc->nbytes + cdb_len);
	cpb->prd = cpu_to_le32(pp->pkt_dma + offsetof(struct inic_pkt, prd));

	cpb->device = qc->tf.device;
	cpb->feature = qc->tf.feature;
	cpb->nsect = qc->tf.nsect;
	cpb->lbal = qc->tf.lbal;
	cpb->lbam = qc->tf.lbam;
	cpb->lbah = qc->tf.lbah;

	if (qc->tf.flags & ATA_TFLAG_LBA48) {
		cpb->hob_feature = qc->tf.hob_feature;
		cpb->hob_nsect = qc->tf.hob_nsect;
		cpb->hob_lbal = qc->tf.hob_lbal;
		cpb->hob_lbam = qc->tf.hob_lbam;
		cpb->hob_lbah = qc->tf.hob_lbah;
	}

	cpb->command = qc->tf.command;
	/* don't load ctl - dunno why.  it's like that in the initio driver */

	/* setup PRD for CDB */
	if (is_atapi) {
		memcpy(pkt->cdb, qc->cdb, ATAPI_CDB_LEN);
		prd->mad = cpu_to_le32(pp->pkt_dma +
				       offsetof(struct inic_pkt, cdb));
		prd->len = cpu_to_le16(cdb_len);
		prd->flags = PRD_CDB | PRD_WRITE;
		if (!is_data)
			prd->flags |= PRD_END;
		prd++;
	}

	/* setup sg table */
	if (is_data)
		inic_fill_sg(prd, qc);

	pp->cpb_tbl[0] = pp->pkt_dma;
}

static unsigned int inic_qc_issue(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	void __iomem *port_base = inic_port_base(ap);

	/* fire up the ADMA engine */
	writew(HCTL_FTHD0 | HCTL_LEDEN, port_base + HOST_CTL);
	writew(IDMA_CTL_GO, port_base + PORT_IDMA_CTL);
	writeb(0, port_base + PORT_CPB_PTQFIFO);

	return 0;
}

static void inic_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
{
	void __iomem *port_base = inic_port_base(ap);

	tf->feature	= readb(port_base + PORT_TF_FEATURE);
	tf->nsect	= readb(port_base + PORT_TF_NSECT);
	tf->lbal	= readb(port_base + PORT_TF_LBAL);
	tf->lbam	= readb(port_base + PORT_TF_LBAM);
	tf->lbah	= readb(port_base + PORT_TF_LBAH);
	tf->device	= readb(port_base + PORT_TF_DEVICE);
	tf->command	= readb(port_base + PORT_TF_COMMAND);
}

static bool inic_qc_fill_rtf(struct ata_queued_cmd *qc)
{
	struct ata_taskfile *rtf = &qc->result_tf;
	struct ata_taskfile tf;

	/* FIXME: Except for status and error, result TF access
	 * doesn't work.  I tried reading from BAR0/2, CPB and BAR5.
	 * None works regardless of which command interface is used.
	 * For now return true iff status indicates device error.
	 * This means that we're reporting bogus sector for RW
	 * failures.  Eeekk....
	 */
	inic_tf_read(qc->ap, &tf);

	if (!(tf.command & ATA_ERR))
		return false;

	rtf->command = tf.command;
	rtf->feature = tf.feature;
	return true;
}

static void inic_freeze(struct ata_port *ap)
{
	void __iomem *port_base = inic_port_base(ap);

	writeb(PIRQ_MASK_FREEZE, port_base + PORT_IRQ_MASK);
	writeb(0xff, port_base + PORT_IRQ_STAT);
}

static void inic_thaw(struct ata_port *ap)
{
	void __iomem *port_base = inic_port_base(ap);

	writeb(0xff, port_base + PORT_IRQ_STAT);
	writeb(PIRQ_MASK_DEFAULT, port_base + PORT_IRQ_MASK);
}

static int inic_check_ready(struct ata_link *link)
{
	void __iomem *port_base = inic_port_base(link->ap);

	return ata_check_ready(readb(port_base + PORT_TF_COMMAND));
}

/*
 * SRST and SControl hardreset don't give valid signature on this
 * controller.  Only controller specific hardreset mechanism works.
 */
static int inic_hardreset(struct ata_link *link, unsigned int *class,
			  unsigned long deadline)
{
	struct ata_port *ap = link->ap;
	void __iomem *port_base = inic_port_base(ap);
	void __iomem *idma_ctl = port_base + PORT_IDMA_CTL;
	const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
	int rc;

	/* hammer it into sane state */
	inic_reset_port(port_base);

	writew(IDMA_CTL_RST_ATA, idma_ctl);
	readw(idma_ctl);	/* flush */
	ata_msleep(ap, 1);
	writew(0, idma_ctl);

	rc = sata_link_resume(link, timing, deadline);
	if (rc) {
		ata_link_warn(link,
			      "failed to resume link after reset (errno=%d)\n",
			      rc);
		return rc;
	}

	*class = ATA_DEV_NONE;
	if (ata_link_online(link)) {
		struct ata_taskfile tf;

		/* wait for link to become ready */
		rc = ata_wait_after_reset(link, deadline, inic_check_ready);
		/* link occupied, -ENODEV too is an error */
		if (rc) {
			ata_link_warn(link,
				      "device not ready after hardreset (errno=%d)\n",
				      rc);
			return rc;
		}

		inic_tf_read(ap, &tf);
		*class = ata_dev_classify(&tf);
	}

	return 0;
}

static void inic_error_handler(struct ata_port *ap)
{
	void __iomem *port_base = inic_port_base(ap);

	inic_reset_port(port_base);
	ata_std_error_handler(ap);
}

static void inic_post_internal_cmd(struct ata_queued_cmd *qc)
{
	/* make DMA engine forget about the failed command */
	if (qc->flags & ATA_QCFLAG_FAILED)
		inic_reset_port(inic_port_base(qc->ap));
}

static void init_port(struct ata_port *ap)
{
	void __iomem *port_base = inic_port_base(ap);
	struct inic_port_priv *pp = ap->private_data;

	/* clear packet and CPB table */
	memset(pp->pkt, 0, sizeof(struct inic_pkt));
	memset(pp->cpb_tbl, 0, IDMA_CPB_TBL_SIZE);

	/* setup CPB lookup table addresses */
	writel(pp->cpb_tbl_dma, port_base + PORT_CPB_CPBLAR);
}

static int inic_port_resume(struct ata_port *ap)
{
	init_port(ap);
	return 0;
}

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

	/* alloc and initialize private data */
	pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
	if (!pp)
		return -ENOMEM;
	ap->private_data = pp;

	/* Alloc resources */
	pp->pkt = dmam_alloc_coherent(dev, sizeof(struct inic_pkt),
				      &pp->pkt_dma, GFP_KERNEL);
	if (!pp->pkt)
		return -ENOMEM;

	pp->cpb_tbl = dmam_alloc_coherent(dev, IDMA_CPB_TBL_SIZE,
					  &pp->cpb_tbl_dma, GFP_KERNEL);
	if (!pp->cpb_tbl)
		return -ENOMEM;

	init_port(ap);

	return 0;
}

static struct ata_port_operations inic_port_ops = {
	.inherits		= &sata_port_ops,

	.check_atapi_dma	= inic_check_atapi_dma,
	.qc_prep		= inic_qc_prep,
	.qc_issue		= inic_qc_issue,
	.qc_fill_rtf		= inic_qc_fill_rtf,

	.freeze			= inic_freeze,
	.thaw			= inic_thaw,
	.hardreset		= inic_hardreset,
	.error_handler		= inic_error_handler,
	.post_internal_cmd	= inic_post_internal_cmd,

	.scr_read		= inic_scr_read,
	.scr_write		= inic_scr_write,

	.port_resume		= inic_port_resume,
	.port_start		= inic_port_start,
};

static struct ata_port_info inic_port_info = {
	.flags			= ATA_FLAG_SATA | ATA_FLAG_PIO_DMA,
	.pio_mask		= ATA_PIO4,
	.mwdma_mask		= ATA_MWDMA2,
	.udma_mask		= ATA_UDMA6,
	.port_ops		= &inic_port_ops
};

static int init_controller(void __iomem *mmio_base, u16 hctl)
{
	int i;
	u16 val;

	hctl &= ~HCTL_KNOWN_BITS;

	/* Soft reset whole controller.  Spec says reset duration is 3
	 * PCI clocks, be generous and give it 10ms.
	 */
	writew(hctl | HCTL_SOFTRST, mmio_base + HOST_CTL);
	readw(mmio_base + HOST_CTL); /* flush */

	for (i = 0; i < 10; i++) {
		msleep(1);
		val = readw(mmio_base + HOST_CTL);
		if (!(val & HCTL_SOFTRST))
			break;
	}

	if (val & HCTL_SOFTRST)
		return -EIO;

	/* mask all interrupts and reset ports */
	for (i = 0; i < NR_PORTS; i++) {
		void __iomem *port_base = mmio_base + i * PORT_SIZE;

		writeb(0xff, port_base + PORT_IRQ_MASK);
		inic_reset_port(port_base);
	}

	/* port IRQ is masked now, unmask global IRQ */
	writew(hctl & ~HCTL_IRQOFF, mmio_base + HOST_CTL);
	val = readw(mmio_base + HOST_IRQ_MASK);
	val &= ~(HIRQ_PORT0 | HIRQ_PORT1);
	writew(val, mmio_base + HOST_IRQ_MASK);

	return 0;
}

#ifdef CONFIG_PM
static int inic_pci_device_resume(struct pci_dev *pdev)
{
	struct ata_host *host = pci_get_drvdata(pdev);
	struct inic_host_priv *hpriv = host->private_data;
	int rc;

	rc = ata_pci_device_do_resume(pdev);
	if (rc)
		return rc;

	if (pdev->dev.power.power_state.event == PM_EVENT_SUSPEND) {
		rc = init_controller(hpriv->mmio_base, hpriv->cached_hctl);
		if (rc)
			return rc;
	}

	ata_host_resume(host);

	return 0;
}
#endif

static int inic_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	const struct ata_port_info *ppi[] = { &inic_port_info, NULL };
	struct ata_host *host;
	struct inic_host_priv *hpriv;
	void __iomem * const *iomap;
	int mmio_bar;
	int i, rc;

	ata_print_version_once(&pdev->dev, DRV_VERSION);

	/* alloc host */
	host = ata_host_alloc_pinfo(&pdev->dev, ppi, NR_PORTS);
	hpriv = devm_kzalloc(&pdev->dev, sizeof(*hpriv), GFP_KERNEL);
	if (!host || !hpriv)
		return -ENOMEM;

	host->private_data = hpriv;

	/* Acquire resources and fill host.  Note that PCI and cardbus
	 * use different BARs.
	 */
	rc = pcim_enable_device(pdev);
	if (rc)
		return rc;

	if (pci_resource_flags(pdev, MMIO_BAR_PCI) & IORESOURCE_MEM)
		mmio_bar = MMIO_BAR_PCI;
	else
		mmio_bar = MMIO_BAR_CARDBUS;

	rc = pcim_iomap_regions(pdev, 1 << mmio_bar, DRV_NAME);
	if (rc)
		return rc;
	host->iomap = iomap = pcim_iomap_table(pdev);
	hpriv->mmio_base = iomap[mmio_bar];
	hpriv->cached_hctl = readw(hpriv->mmio_base + HOST_CTL);

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

		ata_port_pbar_desc(ap, mmio_bar, -1, "mmio");
		ata_port_pbar_desc(ap, mmio_bar, i * PORT_SIZE, "port");
	}

	/* Set dma_mask.  This devices doesn't support 64bit addressing. */
	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;
	}

	/*
	 * This controller is braindamaged.  dma_boundary is 0xffff
	 * like others but it will lock up the whole machine HARD if
	 * 65536 byte PRD entry is fed. Reduce maximum segment size.
	 */
	rc = pci_set_dma_max_seg_size(pdev, 65536 - 512);
	if (rc) {
		dev_err(&pdev->dev, "failed to set the maximum segment size\n");
		return rc;
	}

	rc = init_controller(hpriv->mmio_base, hpriv->cached_hctl);
	if (rc) {
		dev_err(&pdev->dev, "failed to initialize controller\n");
		return rc;
	}

	pci_set_master(pdev);
	return ata_host_activate(host, pdev->irq, inic_interrupt, IRQF_SHARED,
				 &inic_sht);
}

static const struct pci_device_id inic_pci_tbl[] = {
	{ PCI_VDEVICE(INIT, 0x1622), },
	{ },
};

static struct pci_driver inic_pci_driver = {
	.name 		= DRV_NAME,
	.id_table	= inic_pci_tbl,
#ifdef CONFIG_PM
	.suspend	= ata_pci_device_suspend,
	.resume		= inic_pci_device_resume,
#endif
	.probe 		= inic_init_one,
	.remove		= ata_pci_remove_one,
};

module_pci_driver(inic_pci_driver);

MODULE_AUTHOR("Tejun Heo");
MODULE_DESCRIPTION("low-level driver for Initio 162x SATA");
MODULE_LICENSE("GPL v2");
MODULE_DEVICE_TABLE(pci, inic_pci_tbl);
MODULE_VERSION(DRV_VERSION);