aboutsummaryrefslogtreecommitdiff
path: root/drivers/ide/pci/sgiioc4.c
blob: d396b2929ed87791564600b85675d72eda7af774 (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
/*
 * Copyright (c) 2003-2006 Silicon Graphics, Inc.  All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * For further information regarding this notice, see:
 *
 * http://oss.sgi.com/projects/GenInfo/NoticeExplan
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/hdreg.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/blkdev.h>
#include <linux/ioc4.h>
#include <asm/io.h>

#include <linux/ide.h>

/* IOC4 Specific Definitions */
#define IOC4_CMD_OFFSET		0x100
#define IOC4_CTRL_OFFSET	0x120
#define IOC4_DMA_OFFSET		0x140
#define IOC4_INTR_OFFSET	0x0

#define IOC4_TIMING		0x00
#define IOC4_DMA_PTR_L		0x01
#define IOC4_DMA_PTR_H		0x02
#define IOC4_DMA_ADDR_L		0x03
#define IOC4_DMA_ADDR_H		0x04
#define IOC4_BC_DEV		0x05
#define IOC4_BC_MEM		0x06
#define	IOC4_DMA_CTRL		0x07
#define	IOC4_DMA_END_ADDR	0x08

/* Bits in the IOC4 Control/Status Register */
#define	IOC4_S_DMA_START	0x01
#define	IOC4_S_DMA_STOP		0x02
#define	IOC4_S_DMA_DIR		0x04
#define	IOC4_S_DMA_ACTIVE	0x08
#define	IOC4_S_DMA_ERROR	0x10
#define	IOC4_ATA_MEMERR		0x02

/* Read/Write Directions */
#define	IOC4_DMA_WRITE		0x04
#define	IOC4_DMA_READ		0x00

/* Interrupt Register Offsets */
#define IOC4_INTR_REG		0x03
#define	IOC4_INTR_SET		0x05
#define	IOC4_INTR_CLEAR		0x07

#define IOC4_IDE_CACHELINE_SIZE	128
#define IOC4_CMD_CTL_BLK_SIZE	0x20
#define IOC4_SUPPORTED_FIRMWARE_REV 46

typedef struct {
	u32 timing_reg0;
	u32 timing_reg1;
	u32 low_mem_ptr;
	u32 high_mem_ptr;
	u32 low_mem_addr;
	u32 high_mem_addr;
	u32 dev_byte_count;
	u32 mem_byte_count;
	u32 status;
} ioc4_dma_regs_t;

/* Each Physical Region Descriptor Entry size is 16 bytes (2 * 64 bits) */
/* IOC4 has only 1 IDE channel */
#define IOC4_PRD_BYTES       16
#define IOC4_PRD_ENTRIES     (PAGE_SIZE /(4*IOC4_PRD_BYTES))


static void
sgiioc4_init_hwif_ports(hw_regs_t * hw, unsigned long data_port,
			unsigned long ctrl_port, unsigned long irq_port)
{
	unsigned long reg = data_port;
	int i;

	/* Registers are word (32 bit) aligned */
	for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
		hw->io_ports[i] = reg + i * 4;

	if (ctrl_port)
		hw->io_ports[IDE_CONTROL_OFFSET] = ctrl_port;

	if (irq_port)
		hw->io_ports[IDE_IRQ_OFFSET] = irq_port;
}

static void
sgiioc4_maskproc(ide_drive_t * drive, int mask)
{
	writeb(mask ? (drive->ctl | 2) : (drive->ctl & ~2),
	       (void __iomem *)IDE_CONTROL_REG);
}


static int
sgiioc4_checkirq(ide_hwif_t * hwif)
{
	unsigned long intr_addr =
		hwif->io_ports[IDE_IRQ_OFFSET] + IOC4_INTR_REG * 4;

	if ((u8)readl((void __iomem *)intr_addr) & 0x03)
		return 1;

	return 0;
}

static u8 sgiioc4_INB(unsigned long);

static int
sgiioc4_clearirq(ide_drive_t * drive)
{
	u32 intr_reg;
	ide_hwif_t *hwif = HWIF(drive);
	unsigned long other_ir =
	    hwif->io_ports[IDE_IRQ_OFFSET] + (IOC4_INTR_REG << 2);

	/* Code to check for PCI error conditions */
	intr_reg = readl((void __iomem *)other_ir);
	if (intr_reg & 0x03) { /* Valid IOC4-IDE interrupt */
		/*
		 * Using sgiioc4_INB to read the IDE_STATUS_REG has a side effect
		 * of clearing the interrupt.  The first read should clear it
		 * if it is set.  The second read should return a "clear" status
		 * if it got cleared.  If not, then spin for a bit trying to
		 * clear it.
		 */
		u8 stat = sgiioc4_INB(IDE_STATUS_REG);
		int count = 0;
		stat = sgiioc4_INB(IDE_STATUS_REG);
		while ((stat & 0x80) && (count++ < 100)) {
			udelay(1);
			stat = sgiioc4_INB(IDE_STATUS_REG);
		}

		if (intr_reg & 0x02) {
			/* Error when transferring DMA data on PCI bus */
			u32 pci_err_addr_low, pci_err_addr_high,
			    pci_stat_cmd_reg;

			pci_err_addr_low =
				readl((void __iomem *)hwif->io_ports[IDE_IRQ_OFFSET]);
			pci_err_addr_high =
				readl((void __iomem *)(hwif->io_ports[IDE_IRQ_OFFSET] + 4));
			pci_read_config_dword(hwif->pci_dev, PCI_COMMAND,
					      &pci_stat_cmd_reg);
			printk(KERN_ERR
			       "%s(%s) : PCI Bus Error when doing DMA:"
				   " status-cmd reg is 0x%x\n",
			       __FUNCTION__, drive->name, pci_stat_cmd_reg);
			printk(KERN_ERR
			       "%s(%s) : PCI Error Address is 0x%x%x\n",
			       __FUNCTION__, drive->name,
			       pci_err_addr_high, pci_err_addr_low);
			/* Clear the PCI Error indicator */
			pci_write_config_dword(hwif->pci_dev, PCI_COMMAND,
					       0x00000146);
		}

		/* Clear the Interrupt, Error bits on the IOC4 */
		writel(0x03, (void __iomem *)other_ir);

		intr_reg = readl((void __iomem *)other_ir);
	}

	return intr_reg & 3;
}

static void sgiioc4_ide_dma_start(ide_drive_t * drive)
{
	ide_hwif_t *hwif = HWIF(drive);
	unsigned long ioc4_dma_addr = hwif->dma_base + IOC4_DMA_CTRL * 4;
	unsigned int reg = readl((void __iomem *)ioc4_dma_addr);
	unsigned int temp_reg = reg | IOC4_S_DMA_START;

	writel(temp_reg, (void __iomem *)ioc4_dma_addr);
}

static u32
sgiioc4_ide_dma_stop(ide_hwif_t *hwif, u64 dma_base)
{
	unsigned long ioc4_dma_addr = dma_base + IOC4_DMA_CTRL * 4;
	u32	ioc4_dma;
	int	count;

	count = 0;
	ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
	while ((ioc4_dma & IOC4_S_DMA_STOP) && (count++ < 200)) {
		udelay(1);
		ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
	}
	return ioc4_dma;
}

/* Stops the IOC4 DMA Engine */
static int
sgiioc4_ide_dma_end(ide_drive_t * drive)
{
	u32 ioc4_dma, bc_dev, bc_mem, num, valid = 0, cnt = 0;
	ide_hwif_t *hwif = HWIF(drive);
	unsigned long dma_base = hwif->dma_base;
	int dma_stat = 0;
	unsigned long *ending_dma = ide_get_hwifdata(hwif);

	writel(IOC4_S_DMA_STOP, (void __iomem *)(dma_base + IOC4_DMA_CTRL * 4));

	ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);

	if (ioc4_dma & IOC4_S_DMA_STOP) {
		printk(KERN_ERR
		       "%s(%s): IOC4 DMA STOP bit is still 1 :"
		       "ioc4_dma_reg 0x%x\n",
		       __FUNCTION__, drive->name, ioc4_dma);
		dma_stat = 1;
	}

	/*
	 * The IOC4 will DMA 1's to the ending dma area to indicate that
	 * previous data DMA is complete.  This is necessary because of relaxed
	 * ordering between register reads and DMA writes on the Altix.
	 */
	while ((cnt++ < 200) && (!valid)) {
		for (num = 0; num < 16; num++) {
			if (ending_dma[num]) {
				valid = 1;
				break;
			}
		}
		udelay(1);
	}
	if (!valid) {
		printk(KERN_ERR "%s(%s) : DMA incomplete\n", __FUNCTION__,
		       drive->name);
		dma_stat = 1;
	}

	bc_dev = readl((void __iomem *)(dma_base + IOC4_BC_DEV * 4));
	bc_mem = readl((void __iomem *)(dma_base + IOC4_BC_MEM * 4));

	if ((bc_dev & 0x01FF) || (bc_mem & 0x1FF)) {
		if (bc_dev > bc_mem + 8) {
			printk(KERN_ERR
			       "%s(%s): WARNING!! byte_count_dev %d "
			       "!= byte_count_mem %d\n",
			       __FUNCTION__, drive->name, bc_dev, bc_mem);
		}
	}

	drive->waiting_for_dma = 0;
	ide_destroy_dmatable(drive);

	return dma_stat;
}

static int
sgiioc4_ide_dma_on(ide_drive_t * drive)
{
	drive->using_dma = 1;

	return 0;
}

static void sgiioc4_dma_off_quietly(ide_drive_t *drive)
{
	drive->using_dma = 0;

	drive->hwif->dma_host_off(drive);
}

static int sgiioc4_ide_dma_check(ide_drive_t *drive)
{
	/* FIXME: check for available DMA modes */
	if (ide_config_drive_speed(drive, XFER_MW_DMA_2) != 0) {
		printk(KERN_WARNING "%s: couldn't set MWDMA2 mode, "
				    "using PIO instead\n", drive->name);
		return -1;
	} else
		return 0;
}

/* returns 1 if dma irq issued, 0 otherwise */
static int
sgiioc4_ide_dma_test_irq(ide_drive_t * drive)
{
	return sgiioc4_checkirq(HWIF(drive));
}

static void sgiioc4_dma_host_on(ide_drive_t * drive)
{
}

static void sgiioc4_dma_host_off(ide_drive_t * drive)
{
	sgiioc4_clearirq(drive);
}

static void
sgiioc4_resetproc(ide_drive_t * drive)
{
	sgiioc4_ide_dma_end(drive);
	sgiioc4_clearirq(drive);
}

static void
sgiioc4_dma_lost_irq(ide_drive_t * drive)
{
	sgiioc4_resetproc(drive);

	ide_dma_lost_irq(drive);
}

static u8
sgiioc4_INB(unsigned long port)
{
	u8 reg = (u8) readb((void __iomem *) port);

	if ((port & 0xFFF) == 0x11C) {	/* Status register of IOC4 */
		if (reg & 0x51) {	/* Not busy...check for interrupt */
			unsigned long other_ir = port - 0x110;
			unsigned int intr_reg = (u32) readl((void __iomem *) other_ir);

			/* Clear the Interrupt, Error bits on the IOC4 */
			if (intr_reg & 0x03) {
				writel(0x03, (void __iomem *) other_ir);
				intr_reg = (u32) readl((void __iomem *) other_ir);
			}
		}
	}

	return reg;
}

/* Creates a dma map for the scatter-gather list entries */
static void __devinit
ide_dma_sgiioc4(ide_hwif_t * hwif, unsigned long dma_base)
{
	void __iomem *virt_dma_base;
	int num_ports = sizeof (ioc4_dma_regs_t);
	void *pad;

	printk(KERN_INFO "%s: BM-DMA at 0x%04lx-0x%04lx\n", hwif->name,
	       dma_base, dma_base + num_ports - 1);

	if (!request_mem_region(dma_base, num_ports, hwif->name)) {
		printk(KERN_ERR
		       "%s(%s) -- ERROR, Addresses 0x%p to 0x%p "
		       "ALREADY in use\n",
		       __FUNCTION__, hwif->name, (void *) dma_base,
		       (void *) dma_base + num_ports - 1);
		goto dma_alloc_failure;
	}

	virt_dma_base = ioremap(dma_base, num_ports);
	if (virt_dma_base == NULL) {
		printk(KERN_ERR
		       "%s(%s) -- ERROR, Unable to map addresses 0x%lx to 0x%lx\n",
		       __FUNCTION__, hwif->name, dma_base, dma_base + num_ports - 1);
		goto dma_remap_failure;
	}
	hwif->dma_base = (unsigned long) virt_dma_base;

	hwif->dmatable_cpu = pci_alloc_consistent(hwif->pci_dev,
					  IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
					  &hwif->dmatable_dma);

	if (!hwif->dmatable_cpu)
		goto dma_pci_alloc_failure;

	hwif->sg_max_nents = IOC4_PRD_ENTRIES;

	pad = pci_alloc_consistent(hwif->pci_dev, IOC4_IDE_CACHELINE_SIZE,
				   (dma_addr_t *) &(hwif->dma_status));

	if (pad) {
		ide_set_hwifdata(hwif, pad);
		return;
	}

	pci_free_consistent(hwif->pci_dev,
			    IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
			    hwif->dmatable_cpu, hwif->dmatable_dma);
	printk(KERN_INFO
	       "%s() -- Error! Unable to allocate DMA Maps for drive %s\n",
	       __FUNCTION__, hwif->name);
	printk(KERN_INFO
	       "Changing from DMA to PIO mode for Drive %s\n", hwif->name);

dma_pci_alloc_failure:
	iounmap(virt_dma_base);

dma_remap_failure:
	release_mem_region(dma_base, num_ports);

dma_alloc_failure:
	/* Disable DMA because we couldnot allocate any DMA maps */
	hwif->autodma = 0;
	hwif->atapi_dma = 0;
}

/* Initializes the IOC4 DMA Engine */
static void
sgiioc4_configure_for_dma(int dma_direction, ide_drive_t * drive)
{
	u32 ioc4_dma;
	ide_hwif_t *hwif = HWIF(drive);
	unsigned long dma_base = hwif->dma_base;
	unsigned long ioc4_dma_addr = dma_base + IOC4_DMA_CTRL * 4;
	u32 dma_addr, ending_dma_addr;

	ioc4_dma = readl((void __iomem *)ioc4_dma_addr);

	if (ioc4_dma & IOC4_S_DMA_ACTIVE) {
		printk(KERN_WARNING
			"%s(%s):Warning!! DMA from previous transfer was still active\n",
		       __FUNCTION__, drive->name);
		writel(IOC4_S_DMA_STOP, (void __iomem *)ioc4_dma_addr);
		ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);

		if (ioc4_dma & IOC4_S_DMA_STOP)
			printk(KERN_ERR
			       "%s(%s) : IOC4 Dma STOP bit is still 1\n",
			       __FUNCTION__, drive->name);
	}

	ioc4_dma = readl((void __iomem *)ioc4_dma_addr);
	if (ioc4_dma & IOC4_S_DMA_ERROR) {
		printk(KERN_WARNING
		       "%s(%s) : Warning!! - DMA Error during Previous"
		       " transfer | status 0x%x\n",
		       __FUNCTION__, drive->name, ioc4_dma);
		writel(IOC4_S_DMA_STOP, (void __iomem *)ioc4_dma_addr);
		ioc4_dma = sgiioc4_ide_dma_stop(hwif, dma_base);

		if (ioc4_dma & IOC4_S_DMA_STOP)
			printk(KERN_ERR
			       "%s(%s) : IOC4 DMA STOP bit is still 1\n",
			       __FUNCTION__, drive->name);
	}

	/* Address of the Scatter Gather List */
	dma_addr = cpu_to_le32(hwif->dmatable_dma);
	writel(dma_addr, (void __iomem *)(dma_base + IOC4_DMA_PTR_L * 4));

	/* Address of the Ending DMA */
	memset(ide_get_hwifdata(hwif), 0, IOC4_IDE_CACHELINE_SIZE);
	ending_dma_addr = cpu_to_le32(hwif->dma_status);
	writel(ending_dma_addr, (void __iomem *)(dma_base + IOC4_DMA_END_ADDR * 4));

	writel(dma_direction, (void __iomem *)ioc4_dma_addr);
	drive->waiting_for_dma = 1;
}

/* IOC4 Scatter Gather list Format 					 */
/* 128 Bit entries to support 64 bit addresses in the future		 */
/* The Scatter Gather list Entry should be in the BIG-ENDIAN Format	 */
/* --------------------------------------------------------------------- */
/* | Upper 32 bits - Zero           |	 	Lower 32 bits- address | */
/* --------------------------------------------------------------------- */
/* | Upper 32 bits - Zero	    |EOL| 15 unused     | 16 Bit Length| */
/* --------------------------------------------------------------------- */
/* Creates the scatter gather list, DMA Table */
static unsigned int
sgiioc4_build_dma_table(ide_drive_t * drive, struct request *rq, int ddir)
{
	ide_hwif_t *hwif = HWIF(drive);
	unsigned int *table = hwif->dmatable_cpu;
	unsigned int count = 0, i = 1;
	struct scatterlist *sg;

	hwif->sg_nents = i = ide_build_sglist(drive, rq);

	if (!i)
		return 0;	/* sglist of length Zero */

	sg = hwif->sg_table;
	while (i && sg_dma_len(sg)) {
		dma_addr_t cur_addr;
		int cur_len;
		cur_addr = sg_dma_address(sg);
		cur_len = sg_dma_len(sg);

		while (cur_len) {
			if (count++ >= IOC4_PRD_ENTRIES) {
				printk(KERN_WARNING
				       "%s: DMA table too small\n",
				       drive->name);
				goto use_pio_instead;
			} else {
				u32 bcount =
				    0x10000 - (cur_addr & 0xffff);

				if (bcount > cur_len)
					bcount = cur_len;

				/* put the addr, length in
				 * the IOC4 dma-table format */
				*table = 0x0;
				table++;
				*table = cpu_to_be32(cur_addr);
				table++;
				*table = 0x0;
				table++;

				*table = cpu_to_be32(bcount);
				table++;

				cur_addr += bcount;
				cur_len -= bcount;
			}
		}

		sg++;
		i--;
	}

	if (count) {
		table--;
		*table |= cpu_to_be32(0x80000000);
		return count;
	}

use_pio_instead:
	pci_unmap_sg(hwif->pci_dev, hwif->sg_table, hwif->sg_nents,
		     hwif->sg_dma_direction);

	return 0;		/* revert to PIO for this request */
}

static int sgiioc4_ide_dma_setup(ide_drive_t *drive)
{
	struct request *rq = HWGROUP(drive)->rq;
	unsigned int count = 0;
	int ddir;

	if (rq_data_dir(rq))
		ddir = PCI_DMA_TODEVICE;
	else
		ddir = PCI_DMA_FROMDEVICE;

	if (!(count = sgiioc4_build_dma_table(drive, rq, ddir))) {
		/* try PIO instead of DMA */
		ide_map_sg(drive, rq);
		return 1;
	}

	if (rq_data_dir(rq))
		/* Writes TO the IOC4 FROM Main Memory */
		ddir = IOC4_DMA_READ;
	else
		/* Writes FROM the IOC4 TO Main Memory */
		ddir = IOC4_DMA_WRITE;

	sgiioc4_configure_for_dma(ddir, drive);

	return 0;
}

static void __devinit
ide_init_sgiioc4(ide_hwif_t * hwif)
{
	hwif->mmio = 1;
	hwif->autodma = 1;
	hwif->atapi_dma = 1;
	hwif->ultra_mask = 0x0;	/* Disable Ultra DMA */
	hwif->mwdma_mask = 0x2;	/* Multimode-2 DMA  */
	hwif->swdma_mask = 0x2;
	hwif->tuneproc = NULL;	/* Sets timing for PIO mode */
	hwif->speedproc = NULL;	/* Sets timing for DMA &/or PIO modes */
	hwif->selectproc = NULL;/* Use the default routine to select drive */
	hwif->reset_poll = NULL;/* No HBA specific reset_poll needed */
	hwif->pre_reset = NULL;	/* No HBA specific pre_set needed */
	hwif->resetproc = &sgiioc4_resetproc;/* Reset DMA engine,
						clear interrupts */
	hwif->intrproc = NULL;	/* Enable or Disable interrupt from drive */
	hwif->maskproc = &sgiioc4_maskproc;	/* Mask on/off NIEN register */
	hwif->quirkproc = NULL;
	hwif->busproc = NULL;

	hwif->dma_setup = &sgiioc4_ide_dma_setup;
	hwif->dma_start = &sgiioc4_ide_dma_start;
	hwif->ide_dma_end = &sgiioc4_ide_dma_end;
	hwif->ide_dma_check = &sgiioc4_ide_dma_check;
	hwif->ide_dma_on = &sgiioc4_ide_dma_on;
	hwif->dma_off_quietly = &sgiioc4_dma_off_quietly;
	hwif->ide_dma_test_irq = &sgiioc4_ide_dma_test_irq;
	hwif->dma_host_on = &sgiioc4_dma_host_on;
	hwif->dma_host_off = &sgiioc4_dma_host_off;
	hwif->dma_lost_irq = &sgiioc4_dma_lost_irq;
	hwif->dma_timeout = &ide_dma_timeout;

	hwif->INB = &sgiioc4_INB;
}

static int __devinit
sgiioc4_ide_setup_pci_device(struct pci_dev *dev, ide_pci_device_t * d)
{
	unsigned long cmd_base, dma_base, irqport;
	unsigned long bar0, cmd_phys_base, ctl;
	void __iomem *virt_base;
	ide_hwif_t *hwif;
	int h;

	/*
	 * Find an empty HWIF; if none available, return -ENOMEM.
	 */
	for (h = 0; h < MAX_HWIFS; ++h) {
		hwif = &ide_hwifs[h];
		if (hwif->chipset == ide_unknown)
			break;
	}
	if (h == MAX_HWIFS) {
		printk(KERN_ERR "%s: too many IDE interfaces, no room in table\n", d->name);
		return -ENOMEM;
	}

	/*  Get the CmdBlk and CtrlBlk Base Registers */
	bar0 = pci_resource_start(dev, 0);
	virt_base = ioremap(bar0, pci_resource_len(dev, 0));
	if (virt_base == NULL) {
		printk(KERN_ERR "%s: Unable to remap BAR 0 address: 0x%lx\n",
			d->name, bar0);
		return -ENOMEM;
	}
	cmd_base = (unsigned long) virt_base + IOC4_CMD_OFFSET;
	ctl = (unsigned long) virt_base + IOC4_CTRL_OFFSET;
	irqport = (unsigned long) virt_base + IOC4_INTR_OFFSET;
	dma_base = pci_resource_start(dev, 0) + IOC4_DMA_OFFSET;

	cmd_phys_base = bar0 + IOC4_CMD_OFFSET;
	if (!request_mem_region(cmd_phys_base, IOC4_CMD_CTL_BLK_SIZE,
	    hwif->name)) {
		printk(KERN_ERR
			"%s : %s -- ERROR, Addresses "
			"0x%p to 0x%p ALREADY in use\n",
		       __FUNCTION__, hwif->name, (void *) cmd_phys_base,
		       (void *) cmd_phys_base + IOC4_CMD_CTL_BLK_SIZE);
		return -ENOMEM;
	}

	if (hwif->io_ports[IDE_DATA_OFFSET] != cmd_base) {
		/* Initialize the IO registers */
		sgiioc4_init_hwif_ports(&hwif->hw, cmd_base, ctl, irqport);
		memcpy(hwif->io_ports, hwif->hw.io_ports,
		       sizeof (hwif->io_ports));
		hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
	}

	hwif->irq = dev->irq;
	hwif->chipset = ide_pci;
	hwif->pci_dev = dev;
	hwif->channel = 0;	/* Single Channel chip */
	hwif->cds = (struct ide_pci_device_s *) d;
	hwif->gendev.parent = &dev->dev;/* setup proper ancestral information */

	/* The IOC4 uses MMIO rather than Port IO. */
	default_hwif_mmiops(hwif);

	/* Initializing chipset IRQ Registers */
	writel(0x03, (void __iomem *)(irqport + IOC4_INTR_SET * 4));

	ide_init_sgiioc4(hwif);

	if (dma_base)
		ide_dma_sgiioc4(hwif, dma_base);
	else
		printk(KERN_INFO "%s: %s Bus-Master DMA disabled\n",
		       hwif->name, d->name);

	if (probe_hwif_init(hwif))
		return -EIO;

	/* Create /proc/ide entries */
	ide_proc_register_port(hwif);

	return 0;
}

static unsigned int __devinit
pci_init_sgiioc4(struct pci_dev *dev, ide_pci_device_t * d)
{
	unsigned int class_rev;
	int ret;

	pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
	class_rev &= 0xff;
	printk(KERN_INFO "%s: IDE controller at PCI slot %s, revision %d\n",
			d->name, pci_name(dev), class_rev);
	if (class_rev < IOC4_SUPPORTED_FIRMWARE_REV) {
		printk(KERN_ERR "Skipping %s IDE controller in slot %s: "
			"firmware is obsolete - please upgrade to revision"
			"46 or higher\n", d->name, pci_name(dev));
		ret = -EAGAIN;
		goto out;
	}
	ret = sgiioc4_ide_setup_pci_device(dev, d);
out:
	return ret;
}

static ide_pci_device_t sgiioc4_chipset __devinitdata = {
	 /* Channel 0 */
	 .name = "SGIIOC4",
	 .init_hwif = ide_init_sgiioc4,
	 .init_dma = ide_dma_sgiioc4,
	 .channels = 1,
	 .autodma = AUTODMA,
	 /* SGI IOC4 doesn't have enablebits. */
	 .bootable = ON_BOARD,
};

int
ioc4_ide_attach_one(struct ioc4_driver_data *idd)
{
	/* PCI-RT does not bring out IDE connection.
	 * Do not attach to this particular IOC4.
	 */
	if (idd->idd_variant == IOC4_VARIANT_PCI_RT)
		return 0;

	return pci_init_sgiioc4(idd->idd_pdev, &sgiioc4_chipset);
}

static struct ioc4_submodule ioc4_ide_submodule = {
	.is_name = "IOC4_ide",
	.is_owner = THIS_MODULE,
	.is_probe = ioc4_ide_attach_one,
/*	.is_remove = ioc4_ide_remove_one,	*/
};

static int __init ioc4_ide_init(void)
{
	return ioc4_register_submodule(&ioc4_ide_submodule);
}

late_initcall(ioc4_ide_init); /* Call only after IDE init is done */

MODULE_AUTHOR("Aniket Malatpure/Jeremy Higdon");
MODULE_DESCRIPTION("IDE PCI driver module for SGI IOC4 Base-IO Card");
MODULE_LICENSE("GPL");