aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/ata/pata_ali.c
blob: e6d2b840e8706ad5e32ab9337fe72d1f428420ac (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
/*
 * pata_ali.c 	- ALI 15x3 PATA for new ATA layer
 *			  (C) 2005 Red Hat Inc
 *			  Alan Cox <alan@redhat.com>
 *
 * based in part upon
 * linux/drivers/ide/pci/alim15x3.c		Version 0.17	2003/01/02
 *
 *  Copyright (C) 1998-2000 Michel Aubry, Maintainer
 *  Copyright (C) 1998-2000 Andrzej Krzysztofowicz, Maintainer
 *  Copyright (C) 1999-2000 CJ, cjtsai@ali.com.tw, Maintainer
 *
 *  Copyright (C) 1998-2000 Andre Hedrick (andre@linux-ide.org)
 *  May be copied or modified under the terms of the GNU General Public License
 *  Copyright (C) 2002 Alan Cox <alan@redhat.com>
 *  ALi (now ULi M5228) support by Clear Zhang <Clear.Zhang@ali.com.tw>
 *
 *  Documentation
 *	Chipset documentation available under NDA only
 *
 *  TODO/CHECK
 *	Cannot have ATAPI on both master & slave for rev < c2 (???) but
 *	otherwise should do atapi DMA.
 */

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

#define DRV_NAME "pata_ali"
#define DRV_VERSION "0.6.6"

/*
 *	Cable special cases
 */

static struct dmi_system_id cable_dmi_table[] = {
	{
		.ident = "HP Pavilion N5430",
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
			DMI_MATCH(DMI_BOARD_NAME, "OmniBook N32N-736"),
		},
	},
	{ }
};

static int ali_cable_override(struct pci_dev *pdev)
{
	/* Fujitsu P2000 */
	if (pdev->subsystem_vendor == 0x10CF && pdev->subsystem_device == 0x10AF)
	   	return 1;
	/* Systems by DMI */
	if (dmi_check_system(cable_dmi_table))
		return 1;
	return 0;
}

/**
 *	ali_c2_cable_detect	-	cable detection
 *	@ap: ATA port
 *
 *	Perform cable detection for C2 and later revisions
 */

static int ali_c2_cable_detect(struct ata_port *ap)
{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	u8 ata66;

	/* Certain laptops use short but suitable cables and don't
	   implement the detect logic */

	if (ali_cable_override(pdev))
		return ATA_CBL_PATA40_SHORT;

	/* Host view cable detect 0x4A bit 0 primary bit 1 secondary
	   Bit set for 40 pin */
	pci_read_config_byte(pdev, 0x4A, &ata66);
	if (ata66 & (1 << ap->port_no))
		return ATA_CBL_PATA40;
	else
		return ATA_CBL_PATA80;
}

/**
 *	ali_early_error_handler	-	reset for eary chip
 *	@ap: ATA port
 *
 *	Handle the reset callback for the later chips with cable detect
 */

static int ali_c2_pre_reset(struct ata_port *ap)
{
	ap->cbl = ali_c2_cable_detect(ap);
	return ata_std_prereset(ap);
}

static void ali_c2_error_handler(struct ata_port *ap)
{
	ata_bmdma_drive_eh(ap, ali_c2_pre_reset,
			       ata_std_softreset, NULL,
			       ata_std_postreset);
}

/**
 *	ali_early_cable_detect	-	cable detection
 *	@ap: ATA port
 *
 *	Perform cable detection for older chipsets. This turns out to be
 *	rather easy to implement
 */

static int ali_early_cable_detect(struct ata_port *ap)
{
	return ATA_CBL_PATA40;
}

/**
 *	ali_early_probe_init	-	reset for early chip
 *	@ap: ATA port
 *
 *	Handle the reset callback for the early (pre cable detect) chips.
 */

static int ali_early_pre_reset(struct ata_port *ap)
{
	ap->cbl = ali_early_cable_detect(ap);
	return ata_std_prereset(ap);
}

static void ali_early_error_handler(struct ata_port *ap)
{
	return ata_bmdma_drive_eh(ap, ali_early_pre_reset,
				     ata_std_softreset, NULL,
				     ata_std_postreset);
}

/**
 *	ali_20_filter		-	filter for earlier ALI DMA
 *	@ap: ALi ATA port
 *	@adev: attached device
 *
 *	Ensure that we do not do DMA on CD devices. We may be able to
 *	fix that later on. Also ensure we do not do UDMA on WDC drives
 */

static unsigned long ali_20_filter(const struct ata_port *ap, struct ata_device *adev, unsigned long mask)
{
	char model_num[40];
	/* No DMA on anything but a disk for now */
	if (adev->class != ATA_DEV_ATA)
		mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
	ata_id_string(adev->id, model_num, ATA_ID_PROD_OFS, sizeof(model_num));
	if (strstr(model_num, "WDC"))
		return mask &= ~ATA_MASK_UDMA;
	return ata_pci_default_filter(ap, adev, mask);
}

/**
 *	ali_fifo_control	-	FIFO manager
 *	@ap: ALi channel to control
 *	@adev: device for FIFO control
 *	@on: 0 for off 1 for on
 *
 *	Enable or disable the FIFO on a given device. Because of the way the
 *	ALi FIFO works it provides a boost on ATA disk but can be confused by
 *	ATAPI and we must therefore manage it.
 */

static void ali_fifo_control(struct ata_port *ap, struct ata_device *adev, int on)
{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	int pio_fifo = 0x54 + ap->port_no;
	u8 fifo;
	int shift = 4 * adev->devno;

	/* ATA - FIFO on set nibble to 0x05, ATAPI - FIFO off, set nibble to
	   0x00. Not all the docs agree but the behaviour we now use is the
	   one stated in the BIOS Programming Guide */

	pci_read_config_byte(pdev, pio_fifo, &fifo);
	fifo &= ~(0x0F << shift);
	if (on)
		fifo |= (on << shift);
	pci_write_config_byte(pdev, pio_fifo, fifo);
}

/**
 *	ali_program_modes	-	load mode registers
 *	@ap: ALi channel to load
 *	@adev: Device the timing is for
 *	@cmd: Command timing
 *	@data: Data timing
 *	@ultra: UDMA timing or zero for off
 *
 *	Loads the timing registers for cmd/data and disable UDMA if
 *	ultra is zero. If ultra is set then load and enable the UDMA
 *	timing but do not touch the command/data timing.
 */

static void ali_program_modes(struct ata_port *ap, struct ata_device *adev, struct ata_timing *t, u8 ultra)
{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	int cas = 0x58 + 4 * ap->port_no;	/* Command timing */
	int cbt = 0x59 + 4 * ap->port_no;	/* Command timing */
	int drwt = 0x5A + 4 * ap->port_no + adev->devno; /* R/W timing */
	int udmat = 0x56 + ap->port_no;	/* UDMA timing */
	int shift = 4 * adev->devno;
	u8 udma;

	if (t != NULL) {
		t->setup = FIT(t->setup, 1, 8) & 7;
		t->act8b = FIT(t->act8b, 1, 8) & 7;
		t->rec8b = FIT(t->rec8b, 1, 16) & 15;
		t->active = FIT(t->active, 1, 8) & 7;
		t->recover = FIT(t->recover, 1, 16) & 15;

		pci_write_config_byte(pdev, cas, t->setup);
		pci_write_config_byte(pdev, cbt, (t->act8b << 4) | t->rec8b);
		pci_write_config_byte(pdev, drwt, (t->active << 4) | t->recover);
	}

	/* Set up the UDMA enable */
	pci_read_config_byte(pdev, udmat, &udma);
	udma &= ~(0x0F << shift);
	udma |= ultra << shift;
	pci_write_config_byte(pdev, udmat, udma);
}

/**
 *	ali_set_piomode	-	set initial PIO mode data
 *	@ap: ATA interface
 *	@adev: ATA device
 *
 *	Program the ALi registers for PIO mode. FIXME: add timings for
 *	PIO5.
 */

static void ali_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
	struct ata_device *pair = ata_dev_pair(adev);
	struct ata_timing t;
	unsigned long T =  1000000000 / 33333;	/* PCI clock based */

	ata_timing_compute(adev, adev->pio_mode, &t, T, 1);
	if (pair) {
		struct ata_timing p;
		ata_timing_compute(pair, pair->pio_mode, &p, T, 1);
		ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP|ATA_TIMING_8BIT);
		if (pair->dma_mode) {
			ata_timing_compute(pair, pair->dma_mode, &p, T, 1);
			ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP|ATA_TIMING_8BIT);
		}
	}

	/* PIO FIFO is only permitted on ATA disk */
	if (adev->class != ATA_DEV_ATA)
		ali_fifo_control(ap, adev, 0x00);
	ali_program_modes(ap, adev, &t, 0);
	if (adev->class == ATA_DEV_ATA)
		ali_fifo_control(ap, adev, 0x05);

}

/**
 *	ali_set_dmamode	-	set initial DMA mode data
 *	@ap: ATA interface
 *	@adev: ATA device
 *
 *	FIXME: MWDMA timings
 */

static void ali_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
	static u8 udma_timing[7] = { 0xC, 0xB, 0xA, 0x9, 0x8, 0xF, 0xD };
	struct ata_device *pair = ata_dev_pair(adev);
	struct ata_timing t;
	unsigned long T =  1000000000 / 33333;	/* PCI clock based */
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);


	if (adev->class == ATA_DEV_ATA)
		ali_fifo_control(ap, adev, 0x08);

	if (adev->dma_mode >= XFER_UDMA_0) {
		ali_program_modes(ap, adev, NULL, udma_timing[adev->dma_mode - XFER_UDMA_0]);
		if (adev->dma_mode >= XFER_UDMA_3) {
			u8 reg4b;
			pci_read_config_byte(pdev, 0x4B, &reg4b);
			reg4b |= 1;
			pci_write_config_byte(pdev, 0x4B, reg4b);
		}
	} else {
		ata_timing_compute(adev, adev->dma_mode, &t, T, 1);
		if (pair) {
			struct ata_timing p;
			ata_timing_compute(pair, pair->pio_mode, &p, T, 1);
			ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP|ATA_TIMING_8BIT);
			if (pair->dma_mode) {
				ata_timing_compute(pair, pair->dma_mode, &p, T, 1);
				ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP|ATA_TIMING_8BIT);
			}
		}
		ali_program_modes(ap, adev, &t, 0);
	}
}

/**
 *	ali_lock_sectors	-	Keep older devices to 255 sector mode
 *	@ap: ATA port
 *	@adev: Device
 *
 *	Called during the bus probe for each device that is found. We use
 *	this call to lock the sector count of the device to 255 or less on
 *	older ALi controllers. If we didn't do this then large I/O's would
 *	require LBA48 commands which the older ALi requires are issued by
 *	slower PIO methods
 */

static void ali_lock_sectors(struct ata_port *ap, struct ata_device *adev)
{
	adev->max_sectors = 255;
}

static struct scsi_host_template ali_sht = {
	.module			= THIS_MODULE,
	.name			= DRV_NAME,
	.ioctl			= ata_scsi_ioctl,
	.queuecommand		= ata_scsi_queuecmd,
	.can_queue		= ATA_DEF_QUEUE,
	.this_id		= ATA_SHT_THIS_ID,
	.sg_tablesize		= LIBATA_MAX_PRD,
	/* Keep LBA28 counts so large I/O's don't turn LBA48 and PIO
	   with older controllers. Not locked so will grow on C5 or later */
	.max_sectors		= 255,
	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
	.emulated		= ATA_SHT_EMULATED,
	.use_clustering		= ATA_SHT_USE_CLUSTERING,
	.proc_name		= DRV_NAME,
	.dma_boundary		= ATA_DMA_BOUNDARY,
	.slave_configure	= ata_scsi_slave_config,
	.slave_destroy		= ata_scsi_slave_destroy,
	.bios_param		= ata_std_bios_param,
};

/*
 *	Port operations for PIO only ALi
 */

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

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

	.qc_prep 	= ata_qc_prep,
	.qc_issue	= ata_qc_issue_prot,

	.data_xfer	= ata_pio_data_xfer,

	.irq_handler	= ata_interrupt,
	.irq_clear	= ata_bmdma_irq_clear,

	.port_start	= ata_port_start,
	.port_stop	= ata_port_stop,
	.host_stop	= ata_host_stop
};

/*
 *	Port operations for DMA capable ALi without cable
 *	detect
 */
static struct ata_port_operations ali_20_port_ops = {
	.port_disable	= ata_port_disable,

	.set_piomode	= ali_set_piomode,
	.set_dmamode	= ali_set_dmamode,
	.mode_filter	= ali_20_filter,

	.tf_load	= ata_tf_load,
	.tf_read	= ata_tf_read,
	.check_status 	= ata_check_status,
	.exec_command	= ata_exec_command,
	.dev_select 	= ata_std_dev_select,
	.dev_config	= ali_lock_sectors,

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

	.bmdma_setup 	= ata_bmdma_setup,
	.bmdma_start 	= ata_bmdma_start,
	.bmdma_stop	= ata_bmdma_stop,
	.bmdma_status 	= ata_bmdma_status,

	.qc_prep 	= ata_qc_prep,
	.qc_issue	= ata_qc_issue_prot,

	.data_xfer	= ata_pio_data_xfer,

	.irq_handler	= ata_interrupt,
	.irq_clear	= ata_bmdma_irq_clear,

	.port_start	= ata_port_start,
	.port_stop	= ata_port_stop,
	.host_stop	= ata_host_stop
};

/*
 *	Port operations for DMA capable ALi with cable detect
 */
static struct ata_port_operations ali_c2_port_ops = {
	.port_disable	= ata_port_disable,
	.set_piomode	= ali_set_piomode,
	.set_dmamode	= ali_set_dmamode,
	.mode_filter	= ata_pci_default_filter,
	.tf_load	= ata_tf_load,
	.tf_read	= ata_tf_read,
	.check_status 	= ata_check_status,
	.exec_command	= ata_exec_command,
	.dev_select 	= ata_std_dev_select,
	.dev_config	= ali_lock_sectors,

	.freeze		= ata_bmdma_freeze,
	.thaw		= ata_bmdma_thaw,
	.error_handler	= ali_c2_error_handler,
	.post_internal_cmd = ata_bmdma_post_internal_cmd,

	.bmdma_setup 	= ata_bmdma_setup,
	.bmdma_start 	= ata_bmdma_start,
	.bmdma_stop	= ata_bmdma_stop,
	.bmdma_status 	= ata_bmdma_status,

	.qc_prep 	= ata_qc_prep,
	.qc_issue	= ata_qc_issue_prot,

	.data_xfer	= ata_pio_data_xfer,

	.irq_handler	= ata_interrupt,
	.irq_clear	= ata_bmdma_irq_clear,

	.port_start	= ata_port_start,
	.port_stop	= ata_port_stop,
	.host_stop	= ata_host_stop
};

/*
 *	Port operations for DMA capable ALi with cable detect and LBA48
 */
static struct ata_port_operations ali_c5_port_ops = {
	.port_disable	= ata_port_disable,
	.set_piomode	= ali_set_piomode,
	.set_dmamode	= ali_set_dmamode,
	.mode_filter	= ata_pci_default_filter,
	.tf_load	= ata_tf_load,
	.tf_read	= ata_tf_read,
	.check_status 	= ata_check_status,
	.exec_command	= ata_exec_command,
	.dev_select 	= ata_std_dev_select,

	.freeze		= ata_bmdma_freeze,
	.thaw		= ata_bmdma_thaw,
	.error_handler	= ali_c2_error_handler,
	.post_internal_cmd = ata_bmdma_post_internal_cmd,

	.bmdma_setup 	= ata_bmdma_setup,
	.bmdma_start 	= ata_bmdma_start,
	.bmdma_stop	= ata_bmdma_stop,
	.bmdma_status 	= ata_bmdma_status,

	.qc_prep 	= ata_qc_prep,
	.qc_issue	= ata_qc_issue_prot,

	.data_xfer	= ata_pio_data_xfer,

	.irq_handler	= ata_interrupt,
	.irq_clear	= ata_bmdma_irq_clear,

	.port_start	= ata_port_start,
	.port_stop	= ata_port_stop,
	.host_stop	= ata_host_stop
};

/**
 *	ali_init_one		-	discovery callback
 *	@pdev: PCI device ID
 *	@id: PCI table info
 *
 *	An ALi IDE interface has been discovered. Figure out what revision
 *	and perform configuration work before handing it to the ATA layer
 */

static int ali_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
	static struct ata_port_info info_early = {
		.sht = &ali_sht,
		.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
		.pio_mask = 0x1f,
		.port_ops = &ali_early_port_ops
	};
	/* Revision 0x20 added DMA */
	static struct ata_port_info info_20 = {
		.sht = &ali_sht,
		.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST | ATA_FLAG_PIO_LBA48,
		.pio_mask = 0x1f,
		.mwdma_mask = 0x07,
		.port_ops = &ali_20_port_ops
	};
	/* Revision 0x20 with support logic added UDMA */
	static struct ata_port_info info_20_udma = {
		.sht = &ali_sht,
		.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST | ATA_FLAG_PIO_LBA48,
		.pio_mask = 0x1f,
		.mwdma_mask = 0x07,
		.udma_mask = 0x07,	/* UDMA33 */
		.port_ops = &ali_20_port_ops
	};
	/* Revision 0xC2 adds UDMA66 */
	static struct ata_port_info info_c2 = {
		.sht = &ali_sht,
		.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST | ATA_FLAG_PIO_LBA48,
		.pio_mask = 0x1f,
		.mwdma_mask = 0x07,
		.udma_mask = 0x1f,
		.port_ops = &ali_c2_port_ops
	};
	/* Revision 0xC3 is UDMA100 */
	static struct ata_port_info info_c3 = {
		.sht = &ali_sht,
		.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST | ATA_FLAG_PIO_LBA48,
		.pio_mask = 0x1f,
		.mwdma_mask = 0x07,
		.udma_mask = 0x3f,
		.port_ops = &ali_c2_port_ops
	};
	/* Revision 0xC4 is UDMA133 */
	static struct ata_port_info info_c4 = {
		.sht = &ali_sht,
		.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST | ATA_FLAG_PIO_LBA48,
		.pio_mask = 0x1f,
		.mwdma_mask = 0x07,
		.udma_mask = 0x7f,
		.port_ops = &ali_c2_port_ops
	};
	/* Revision 0xC5 is UDMA133 with LBA48 DMA */
	static struct ata_port_info info_c5 = {
		.sht = &ali_sht,
		.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
		.pio_mask = 0x1f,
		.mwdma_mask = 0x07,
		.udma_mask = 0x7f,
		.port_ops = &ali_c5_port_ops
	};

	static struct ata_port_info *port_info[2];
	u8 rev, tmp;
	struct pci_dev *north, *isa_bridge;

	pci_read_config_byte(pdev, PCI_REVISION_ID, &rev);

	/*
	 * The chipset revision selects the driver operations and
	 * mode data.
	 */

	if (rev < 0x20) {
		port_info[0] = port_info[1] = &info_early;
	} else if (rev < 0xC2) {
		/* 1543-E/F, 1543C-C, 1543C-D, 1543C-E */
		pci_read_config_byte(pdev, 0x4B, &tmp);
		/* Clear CD-ROM DMA write bit */
		tmp &= 0x7F;
		pci_write_config_byte(pdev, 0x4B, tmp);
        	port_info[0] = port_info[1] = &info_20;
	} else if (rev == 0xC2) {
        	port_info[0] = port_info[1] = &info_c2;
	} else if (rev == 0xC3) {
        	port_info[0] = port_info[1] = &info_c3;
	} else if (rev == 0xC4) {
        	port_info[0] = port_info[1] = &info_c4;
	} else
        	port_info[0] = port_info[1] = &info_c5;

	if (rev >= 0xC2) {
		/* Enable cable detection logic */
		pci_read_config_byte(pdev, 0x4B, &tmp);
		pci_write_config_byte(pdev, 0x4B, tmp | 0x08);
	}

	north = pci_get_slot(pdev->bus, PCI_DEVFN(0,0));
	isa_bridge = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL);

	if (north && north->vendor == PCI_VENDOR_ID_AL) {
		/* Configure the ALi bridge logic. For non ALi rely on BIOS.
		   Set the south bridge enable bit */
		pci_read_config_byte(isa_bridge, 0x79, &tmp);
		if (rev == 0xC2)
			pci_write_config_byte(isa_bridge, 0x79, tmp | 0x04);
		else if (rev > 0xC2)
			pci_write_config_byte(isa_bridge, 0x79, tmp | 0x02);
	}

	if (rev >= 0x20) {
		if (rev < 0xC2) {
			/* Are we paired with a UDMA capable chip */
			pci_read_config_byte(isa_bridge, 0x5E, &tmp);
			if ((tmp & 0x1E) == 0x12)
		        	port_info[0] = port_info[1] = &info_20_udma;
		}
		/*
		 * CD_ROM DMA on (0x53 bit 0). Enable this even if we want
		 * to use PIO. 0x53 bit 1 (rev 20 only) - enable FIFO control
		 * via 0x54/55.
		 */
		pci_read_config_byte(pdev, 0x53, &tmp);
		if (rev <= 0x20)
			tmp &= ~0x02;
		if (rev >= 0xc7)
			tmp |= 0x03;
		else
			tmp |= 0x01;	/* CD_ROM enable for DMA */
		pci_write_config_byte(pdev, 0x53, tmp);
	}

	pci_dev_put(isa_bridge);
	pci_dev_put(north);

	ata_pci_clear_simplex(pdev);
	return ata_pci_init_one(pdev, port_info, 2);
}

static const struct pci_device_id ali[] = {
	{ PCI_VDEVICE(AL, PCI_DEVICE_ID_AL_M5228), },
	{ PCI_VDEVICE(AL, PCI_DEVICE_ID_AL_M5229), },

	{ },
};

static struct pci_driver ali_pci_driver = {
	.name 		= DRV_NAME,
	.id_table	= ali,
	.probe 		= ali_init_one,
	.remove		= ata_pci_remove_one
};

static int __init ali_init(void)
{
	return pci_register_driver(&ali_pci_driver);
}


static void __exit ali_exit(void)
{
	pci_unregister_driver(&ali_pci_driver);
}


MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for ALi PATA");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, ali);
MODULE_VERSION(DRV_VERSION);

module_init(ali_init);
module_exit(ali_exit);