summaryrefslogtreecommitdiff
path: root/drivers/macintosh/mediabay.c
blob: b856bb67169cf9dcaef51e2c5a4c700b28b7f001 (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
/*
 * Driver for the media bay on the PowerBook 3400 and 2400.
 *
 * Copyright (C) 1998 Paul Mackerras.
 *
 * Various evolutions by Benjamin Herrenschmidt & Henry Worth
 *
 *  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.
 */
#include <linux/config.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/hdreg.h>
#include <linux/stddef.h>
#include <linux/init.h>
#include <linux/ide.h>
#include <asm/prom.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/mediabay.h>
#include <asm/sections.h>
#include <asm/ohare.h>
#include <asm/heathrow.h>
#include <asm/keylargo.h>
#include <linux/adb.h>
#include <linux/pmu.h>


#define MB_DEBUG
#define MB_IGNORE_SIGNALS

#ifdef MB_DEBUG
#define MBDBG(fmt, arg...)	printk(KERN_INFO fmt , ## arg)
#else
#define MBDBG(fmt, arg...)	do { } while (0)
#endif

#define MB_FCR32(bay, r)	((bay)->base + ((r) >> 2))
#define MB_FCR8(bay, r)		(((volatile u8 __iomem *)((bay)->base)) + (r))

#define MB_IN32(bay,r)		(in_le32(MB_FCR32(bay,r)))
#define MB_OUT32(bay,r,v)	(out_le32(MB_FCR32(bay,r), (v)))
#define MB_BIS(bay,r,v)		(MB_OUT32((bay), (r), MB_IN32((bay), r) | (v)))
#define MB_BIC(bay,r,v)		(MB_OUT32((bay), (r), MB_IN32((bay), r) & ~(v)))
#define MB_IN8(bay,r)		(in_8(MB_FCR8(bay,r)))
#define MB_OUT8(bay,r,v)	(out_8(MB_FCR8(bay,r), (v)))

struct media_bay_info;

struct mb_ops {
	char*	name;
	void	(*init)(struct media_bay_info *bay);
	u8	(*content)(struct media_bay_info *bay);
	void	(*power)(struct media_bay_info *bay, int on_off);
	int	(*setup_bus)(struct media_bay_info *bay, u8 device_id);
	void	(*un_reset)(struct media_bay_info *bay);
	void	(*un_reset_ide)(struct media_bay_info *bay);
};

struct media_bay_info {
	u32 __iomem			*base;
	int				content_id;
	int				state;
	int				last_value;
	int				value_count;
	int				timer;
	struct macio_dev		*mdev;
	struct mb_ops*			ops;
	int				index;
	int				cached_gpio;
	int				sleeping;
	struct semaphore		lock;
#ifdef CONFIG_BLK_DEV_IDE
	void __iomem			*cd_base;
	int 				cd_index;
	int				cd_irq;
	int				cd_retry;
#endif
};

#define MAX_BAYS	2

static struct media_bay_info media_bays[MAX_BAYS];
int media_bay_count = 0;

#ifdef CONFIG_BLK_DEV_IDE
/* check the busy bit in the media-bay ide interface
   (assumes the media-bay contains an ide device) */
#define MB_IDE_READY(i)	((readb(media_bays[i].cd_base + 0x70) & 0x80) == 0)
#endif

/*
 * Wait that number of ms between each step in normal polling mode
 */
#define MB_POLL_DELAY	25

/*
 * Consider the media-bay ID value stable if it is the same for
 * this number of milliseconds
 */
#define MB_STABLE_DELAY	100

/* Wait after powering up the media bay this delay in ms
 * timeout bumped for some powerbooks
 */
#define MB_POWER_DELAY	200

/*
 * Hold the media-bay reset signal true for this many ticks
 * after a device is inserted before releasing it.
 */
#define MB_RESET_DELAY	50

/*
 * Wait this long after the reset signal is released and before doing
 * further operations. After this delay, the IDE reset signal is released
 * too for an IDE device
 */
#define MB_SETUP_DELAY	100

/*
 * Wait this many ticks after an IDE device (e.g. CD-ROM) is inserted
 * (or until the device is ready) before waiting for busy bit to disappear
 */
#define MB_IDE_WAIT	1000

/*
 * Timeout waiting for busy bit of an IDE device to go down
 */
#define MB_IDE_TIMEOUT	5000

/*
 * Max retries of the full power up/down sequence for an IDE device
 */
#define MAX_CD_RETRIES	3

/*
 * States of a media bay
 */
enum {
	mb_empty = 0,		/* Idle */
	mb_powering_up,		/* power bit set, waiting MB_POWER_DELAY */
	mb_enabling_bay,	/* enable bits set, waiting MB_RESET_DELAY */
	mb_resetting,		/* reset bit unset, waiting MB_SETUP_DELAY */
	mb_ide_resetting,	/* IDE reset bit unser, waiting MB_IDE_WAIT */
	mb_ide_waiting,		/* Waiting for BUSY bit to go away until MB_IDE_TIMEOUT */
	mb_up,			/* Media bay full */
	mb_powering_down	/* Powering down (avoid too fast down/up) */
};

#define MB_POWER_SOUND		0x08
#define MB_POWER_FLOPPY		0x04
#define MB_POWER_ATA		0x02
#define MB_POWER_PCI		0x01
#define MB_POWER_OFF		0x00

/*
 * Functions for polling content of media bay
 */
 
static u8
ohare_mb_content(struct media_bay_info *bay)
{
	return (MB_IN32(bay, OHARE_MBCR) >> 12) & 7;
}

static u8
heathrow_mb_content(struct media_bay_info *bay)
{
	return (MB_IN32(bay, HEATHROW_MBCR) >> 12) & 7;
}

static u8
keylargo_mb_content(struct media_bay_info *bay)
{
	int new_gpio;

	new_gpio = MB_IN8(bay, KL_GPIO_MEDIABAY_IRQ) & KEYLARGO_GPIO_INPUT_DATA;
	if (new_gpio) {
		bay->cached_gpio = new_gpio;
		return MB_NO;
	} else if (bay->cached_gpio != new_gpio) {
		MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
		(void)MB_IN32(bay, KEYLARGO_MBCR);
		udelay(5);
		MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
		(void)MB_IN32(bay, KEYLARGO_MBCR);
		udelay(5);
		bay->cached_gpio = new_gpio;
	}
	return (MB_IN32(bay, KEYLARGO_MBCR) >> 4) & 7;
}

/*
 * Functions for powering up/down the bay, puts the bay device
 * into reset state as well
 */

static void
ohare_mb_power(struct media_bay_info* bay, int on_off)
{
	if (on_off) {
		/* Power up device, assert it's reset line */
		MB_BIC(bay, OHARE_FCR, OH_BAY_RESET_N);
		MB_BIC(bay, OHARE_FCR, OH_BAY_POWER_N);
	} else {
		/* Disable all devices */
		MB_BIC(bay, OHARE_FCR, OH_BAY_DEV_MASK);
		MB_BIC(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
		/* Cut power from bay, release reset line */
		MB_BIS(bay, OHARE_FCR, OH_BAY_POWER_N);
		MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
		MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
	}
	MB_BIC(bay, OHARE_MBCR, 0x00000F00);
}

static void
heathrow_mb_power(struct media_bay_info* bay, int on_off)
{
	if (on_off) {
		/* Power up device, assert it's reset line */
		MB_BIC(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
		MB_BIC(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
	} else {
		/* Disable all devices */
		MB_BIC(bay, HEATHROW_FCR, HRW_BAY_DEV_MASK);
		MB_BIC(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
		/* Cut power from bay, release reset line */
		MB_BIS(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
		MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
		MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
	}
	MB_BIC(bay, HEATHROW_MBCR, 0x00000F00);
}

static void
keylargo_mb_power(struct media_bay_info* bay, int on_off)
{
	if (on_off) {
		/* Power up device, assert it's reset line */
            	MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
            	MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
	} else {
		/* Disable all devices */
		MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_MASK);
		MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
		/* Cut power from bay, release reset line */
		MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
		MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
		MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
	}
	MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
}

/*
 * Functions for configuring the media bay for a given type of device,
 * enable the related busses
 */

static int
ohare_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
{
	switch(device_id) {
		case MB_FD:
		case MB_FD1:
			MB_BIS(bay, OHARE_FCR, OH_BAY_FLOPPY_ENABLE);
			MB_BIS(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
			return 0;
		case MB_CD:
			MB_BIC(bay, OHARE_FCR, OH_IDE1_RESET_N);
			MB_BIS(bay, OHARE_FCR, OH_BAY_IDE_ENABLE);
			return 0;
		case MB_PCI:
			MB_BIS(bay, OHARE_FCR, OH_BAY_PCI_ENABLE);
			return 0;
	}
	return -ENODEV;
}

static int
heathrow_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
{
	switch(device_id) {
		case MB_FD:
		case MB_FD1:
			MB_BIS(bay, HEATHROW_FCR, HRW_BAY_FLOPPY_ENABLE);
			MB_BIS(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
			return 0;
		case MB_CD:
			MB_BIC(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
			MB_BIS(bay, HEATHROW_FCR, HRW_BAY_IDE_ENABLE);
			return 0;
		case MB_PCI:
			MB_BIS(bay, HEATHROW_FCR, HRW_BAY_PCI_ENABLE);
			return 0;
	}
	return -ENODEV;
}

static int
keylargo_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
{
	switch(device_id) {
		case MB_CD:
			MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_IDE_ENABLE);
			MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
			MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
			return 0;
		case MB_PCI:
			MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_PCI_ENABLE);
			return 0;
		case MB_SOUND:
			MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_SOUND_ENABLE);
			return 0;
	}
	return -ENODEV;
}

/*
 * Functions for tweaking resets
 */

static void
ohare_mb_un_reset(struct media_bay_info* bay)
{
	MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
}

static void keylargo_mb_init(struct media_bay_info *bay)
{
	MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
}

static void heathrow_mb_un_reset(struct media_bay_info* bay)
{
	MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
}

static void keylargo_mb_un_reset(struct media_bay_info* bay)
{
	MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
}

static void ohare_mb_un_reset_ide(struct media_bay_info* bay)
{
	MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
}

static void heathrow_mb_un_reset_ide(struct media_bay_info* bay)
{
	MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
}

static void keylargo_mb_un_reset_ide(struct media_bay_info* bay)
{
	MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
}

static inline void set_mb_power(struct media_bay_info* bay, int onoff)
{
	/* Power up up and assert the bay reset line */
	if (onoff) {
		bay->ops->power(bay, 1);
		bay->state = mb_powering_up;
		MBDBG("mediabay%d: powering up\n", bay->index);
	} else { 
		/* Make sure everything is powered down & disabled */
		bay->ops->power(bay, 0);
		bay->state = mb_powering_down;
		MBDBG("mediabay%d: powering down\n", bay->index);
	}
	bay->timer = msecs_to_jiffies(MB_POWER_DELAY);
}

static void poll_media_bay(struct media_bay_info* bay)
{
	int id = bay->ops->content(bay);

	if (id == bay->last_value) {
		if (id != bay->content_id) {
			bay->value_count += msecs_to_jiffies(MB_POLL_DELAY);
			if (bay->value_count >= msecs_to_jiffies(MB_STABLE_DELAY)) {
				/* If the device type changes without going thru
				 * "MB_NO", we force a pass by "MB_NO" to make sure
				 * things are properly reset
				 */
				if ((id != MB_NO) && (bay->content_id != MB_NO)) {
					id = MB_NO;
					MBDBG("mediabay%d: forcing MB_NO\n", bay->index);
				}
				MBDBG("mediabay%d: switching to %d\n", bay->index, id);
				set_mb_power(bay, id != MB_NO);
				bay->content_id = id;
				if (id == MB_NO) {
#ifdef CONFIG_BLK_DEV_IDE
					bay->cd_retry = 0;
#endif
					printk(KERN_INFO "media bay %d is empty\n", bay->index);
				}
			}
		}
	} else {
		bay->last_value = id;
		bay->value_count = 0;
	}
}

int check_media_bay(struct device_node *which_bay, int what)
{
#ifdef CONFIG_BLK_DEV_IDE
	int	i;

	for (i=0; i<media_bay_count; i++)
		if (media_bays[i].mdev && which_bay == media_bays[i].mdev->ofdev.node) {
			if ((what == media_bays[i].content_id) && media_bays[i].state == mb_up)
				return 0;
			media_bays[i].cd_index = -1;
			return -EINVAL;
		}
#endif /* CONFIG_BLK_DEV_IDE */
	return -ENODEV;
}
EXPORT_SYMBOL(check_media_bay);

int check_media_bay_by_base(unsigned long base, int what)
{
#ifdef CONFIG_BLK_DEV_IDE
	int	i;

	for (i=0; i<media_bay_count; i++)
		if (media_bays[i].mdev && base == (unsigned long) media_bays[i].cd_base) {
			if ((what == media_bays[i].content_id) && media_bays[i].state == mb_up)
				return 0;
			media_bays[i].cd_index = -1;
			return -EINVAL;
		} 
#endif
	
	return -ENODEV;
}

int media_bay_set_ide_infos(struct device_node* which_bay, unsigned long base,
	int irq, int index)
{
#ifdef CONFIG_BLK_DEV_IDE
	int	i;

	for (i=0; i<media_bay_count; i++) {
		struct media_bay_info* bay = &media_bays[i];

		if (bay->mdev && which_bay == bay->mdev->ofdev.node) {
			int timeout = 5000;
			
			down(&bay->lock);

 			bay->cd_base	= (void __iomem *) base;
			bay->cd_irq	= irq;

			if ((MB_CD != bay->content_id) || bay->state != mb_up) {
				up(&bay->lock);
				return 0;
			}
			printk(KERN_DEBUG "Registered ide%d for media bay %d\n", index, i);
			do {
				if (MB_IDE_READY(i)) {
					bay->cd_index	= index;
					up(&bay->lock);
					return 0;
				}
				mdelay(1);
			} while(--timeout);
			printk(KERN_DEBUG "Timeount waiting IDE in bay %d\n", i);
			up(&bay->lock);
			return -ENODEV;
		}
	}
#endif /* CONFIG_BLK_DEV_IDE */
	
	return -ENODEV;
}

static void media_bay_step(int i)
{
	struct media_bay_info* bay = &media_bays[i];

	/* We don't poll when powering down */
	if (bay->state != mb_powering_down)
	    poll_media_bay(bay);

	/* If timer expired or polling IDE busy, run state machine */
	if ((bay->state != mb_ide_waiting) && (bay->timer != 0)) {
		bay->timer -= msecs_to_jiffies(MB_POLL_DELAY);
		if (bay->timer > 0)
			return;
		bay->timer = 0;
	}

	switch(bay->state) {
	case mb_powering_up:
	    	if (bay->ops->setup_bus(bay, bay->last_value) < 0) {
			MBDBG("mediabay%d: device not supported (kind:%d)\n", i, bay->content_id);
	    		set_mb_power(bay, 0);
	    		break;
	    	}
	    	bay->timer = msecs_to_jiffies(MB_RESET_DELAY);
	    	bay->state = mb_enabling_bay;
		MBDBG("mediabay%d: enabling (kind:%d)\n", i, bay->content_id);
		break;
	case mb_enabling_bay:
		bay->ops->un_reset(bay);
	    	bay->timer = msecs_to_jiffies(MB_SETUP_DELAY);
	    	bay->state = mb_resetting;
		MBDBG("mediabay%d: waiting reset (kind:%d)\n", i, bay->content_id);
	    	break;
	    
	case mb_resetting:
		if (bay->content_id != MB_CD) {
			MBDBG("mediabay%d: bay is up (kind:%d)\n", i, bay->content_id);
			bay->state = mb_up;
			break;
	    	}
#ifdef CONFIG_BLK_DEV_IDE
		MBDBG("mediabay%d: waiting IDE reset (kind:%d)\n", i, bay->content_id);
		bay->ops->un_reset_ide(bay);
	    	bay->timer = msecs_to_jiffies(MB_IDE_WAIT);
	    	bay->state = mb_ide_resetting;
#else
		printk(KERN_DEBUG "media-bay %d is ide (not compiled in kernel)\n", i);
		set_mb_power(bay, 0);
#endif /* CONFIG_BLK_DEV_IDE */
	    	break;
	    
#ifdef CONFIG_BLK_DEV_IDE
	case mb_ide_resetting:
	    	bay->timer = msecs_to_jiffies(MB_IDE_TIMEOUT);
	    	bay->state = mb_ide_waiting;
		MBDBG("mediabay%d: waiting IDE ready (kind:%d)\n", i, bay->content_id);
	    	break;
	    
	case mb_ide_waiting:
		if (bay->cd_base == NULL) {
			bay->timer = 0;
			bay->state = mb_up;
			MBDBG("mediabay%d: up before IDE init\n", i);
			break;
		} else if (MB_IDE_READY(i)) {
			bay->timer = 0;
			bay->state = mb_up;
			if (bay->cd_index < 0) {
				hw_regs_t hw;

				printk("mediabay %d, registering IDE...\n", i);
				pmu_suspend();
				ide_init_hwif_ports(&hw, (unsigned long) bay->cd_base, (unsigned long) 0, NULL);
				hw.irq = bay->cd_irq;
				hw.chipset = ide_pmac;
				bay->cd_index = ide_register_hw(&hw, NULL);
				pmu_resume();
			}
			if (bay->cd_index == -1) {
				/* We eventually do a retry */
				bay->cd_retry++;
				printk("IDE register error\n");
				set_mb_power(bay, 0);
			} else {
				printk(KERN_DEBUG "media-bay %d is ide%d\n", i, bay->cd_index);
				MBDBG("mediabay %d IDE ready\n", i);
			}
			break;
	    	} else if (bay->timer > 0)
			bay->timer -= msecs_to_jiffies(MB_POLL_DELAY);
	    	if (bay->timer <= 0) {
			printk("\nIDE Timeout in bay %d !, IDE state is: 0x%02x\n",
			       i, readb(bay->cd_base + 0x70));
			MBDBG("mediabay%d: nIDE Timeout !\n", i);
			set_mb_power(bay, 0);
			bay->timer = 0;
	    	}
		break;
#endif /* CONFIG_BLK_DEV_IDE */

	case mb_powering_down:
	    	bay->state = mb_empty;
#ifdef CONFIG_BLK_DEV_IDE
    	        if (bay->cd_index >= 0) {
			printk(KERN_DEBUG "Unregistering mb %d ide, index:%d\n", i,
			       bay->cd_index);
			ide_unregister(bay->cd_index);
			bay->cd_index = -1;
		}
	    	if (bay->cd_retry) {
			if (bay->cd_retry > MAX_CD_RETRIES) {
				/* Should add an error sound (sort of beep in dmasound) */
				printk("\nmedia-bay %d, IDE device badly inserted or unrecognised\n", i);
			} else {
				/* Force a new power down/up sequence */
				bay->content_id = MB_NO;
			}
	    	}
#endif /* CONFIG_BLK_DEV_IDE */    
		MBDBG("mediabay%d: end of power down\n", i);
	    	break;
	}
}

/*
 * This procedure runs as a kernel thread to poll the media bay
 * once each tick and register and unregister the IDE interface
 * with the IDE driver.  It needs to be a thread because
 * ide_register can't be called from interrupt context.
 */
static int media_bay_task(void *x)
{
	int	i;

	strcpy(current->comm, "media-bay");
#ifdef MB_IGNORE_SIGNALS
	sigfillset(&current->blocked);
#endif

	for (;;) {
		for (i = 0; i < media_bay_count; ++i) {
			down(&media_bays[i].lock);
			if (!media_bays[i].sleeping)
				media_bay_step(i);
			up(&media_bays[i].lock);
		}

		msleep_interruptible(MB_POLL_DELAY);
		if (signal_pending(current))
			return 0;
	}
}

static int __devinit media_bay_attach(struct macio_dev *mdev, const struct of_device_id *match)
{
	struct media_bay_info* bay;
	u32 __iomem *regbase;
	struct device_node *ofnode;
	int i;

	ofnode = mdev->ofdev.node;

	if (macio_resource_count(mdev) < 1)
		return -ENODEV;
	if (macio_request_resources(mdev, "media-bay"))
		return -EBUSY;
	/* Media bay registers are located at the beginning of the
         * mac-io chip, we get the parent address for now (hrm...)
         */
	regbase = (u32 __iomem *)
		ioremap(ofnode->parent->addrs[0].address, 0x100);
	if (regbase == NULL) {
		macio_release_resources(mdev);
		return -ENOMEM;
	}
	
	i = media_bay_count++;
	bay = &media_bays[i];
	bay->mdev = mdev;
	bay->base = regbase;
	bay->index = i;
	bay->ops = match->data;
	bay->sleeping = 0;
	init_MUTEX(&bay->lock);

	/* Init HW probing */
	if (bay->ops->init)
		bay->ops->init(bay);

	printk(KERN_INFO "mediabay%d: Registered %s media-bay\n", i, bay->ops->name);

	/* Force an immediate detect */
	set_mb_power(bay, 0);
	msleep(MB_POWER_DELAY);
	bay->content_id = MB_NO;
	bay->last_value = bay->ops->content(bay);
	bay->value_count = msecs_to_jiffies(MB_STABLE_DELAY);
	bay->state = mb_empty;
	do {
		msleep(MB_POLL_DELAY);
		media_bay_step(i);
	} while((bay->state != mb_empty) &&
		(bay->state != mb_up));

	/* Mark us ready by filling our mdev data */
	macio_set_drvdata(mdev, bay);

	/* Startup kernel thread */
	if (i == 0)
		kernel_thread(media_bay_task, NULL, CLONE_KERNEL);

	return 0;

}

static int media_bay_suspend(struct macio_dev *mdev, pm_message_t state)
{
	struct media_bay_info	*bay = macio_get_drvdata(mdev);

	if (state.event != mdev->ofdev.dev.power.power_state.event && state.event == PM_EVENT_SUSPEND) {
		down(&bay->lock);
		bay->sleeping = 1;
		set_mb_power(bay, 0);
		up(&bay->lock);
		msleep(MB_POLL_DELAY);
		mdev->ofdev.dev.power.power_state = state;
	}
	return 0;
}

static int media_bay_resume(struct macio_dev *mdev)
{
	struct media_bay_info	*bay = macio_get_drvdata(mdev);

	if (mdev->ofdev.dev.power.power_state.event != PM_EVENT_ON) {
		mdev->ofdev.dev.power.power_state = PMSG_ON;

	       	/* We re-enable the bay using it's previous content
	       	   only if it did not change. Note those bozo timings,
	       	   they seem to help the 3400 get it right.
	       	 */
	       	/* Force MB power to 0 */
		down(&bay->lock);
	       	set_mb_power(bay, 0);
		msleep(MB_POWER_DELAY);
	       	if (bay->ops->content(bay) != bay->content_id) {
			printk("mediabay%d: content changed during sleep...\n", bay->index);
			up(&bay->lock);
	       		return 0;
		}
	       	set_mb_power(bay, 1);
	       	bay->last_value = bay->content_id;
	       	bay->value_count = msecs_to_jiffies(MB_STABLE_DELAY);
	       	bay->timer = msecs_to_jiffies(MB_POWER_DELAY);
#ifdef CONFIG_BLK_DEV_IDE
	       	bay->cd_retry = 0;
#endif
	       	do {
			msleep(MB_POLL_DELAY);
	       		media_bay_step(bay->index);
	       	} while((bay->state != mb_empty) &&
	       		(bay->state != mb_up));
		bay->sleeping = 0;
		up(&bay->lock);
	}
	return 0;
}


/* Definitions of "ops" structures.
 */
static struct mb_ops ohare_mb_ops = {
	.name		= "Ohare",
	.content	= ohare_mb_content,
	.power		= ohare_mb_power,
	.setup_bus	= ohare_mb_setup_bus,
	.un_reset	= ohare_mb_un_reset,
	.un_reset_ide	= ohare_mb_un_reset_ide,
};

static struct mb_ops heathrow_mb_ops = {
	.name		= "Heathrow",
	.content	= heathrow_mb_content,
	.power		= heathrow_mb_power,
	.setup_bus	= heathrow_mb_setup_bus,
	.un_reset	= heathrow_mb_un_reset,
	.un_reset_ide	= heathrow_mb_un_reset_ide,
};

static struct mb_ops keylargo_mb_ops = {
	.name		= "KeyLargo",
	.init		= keylargo_mb_init,
	.content	= keylargo_mb_content,
	.power		= keylargo_mb_power,
	.setup_bus	= keylargo_mb_setup_bus,
	.un_reset	= keylargo_mb_un_reset,
	.un_reset_ide	= keylargo_mb_un_reset_ide,
};

/*
 * It seems that the bit for the media-bay interrupt in the IRQ_LEVEL
 * register is always set when there is something in the media bay.
 * This causes problems for the interrupt code if we attach an interrupt
 * handler to the media-bay interrupt, because it tends to go into
 * an infinite loop calling the media bay interrupt handler.
 * Therefore we do it all by polling the media bay once each tick.
 */

static struct of_device_id media_bay_match[] =
{
	{
	.name		= "media-bay",
	.compatible	= "keylargo-media-bay",
	.data		= &keylargo_mb_ops,
	},
	{
	.name		= "media-bay",
	.compatible	= "heathrow-media-bay",
	.data		= &heathrow_mb_ops,
	},
	{
	.name		= "media-bay",
	.compatible	= "ohare-media-bay",
	.data		= &ohare_mb_ops,
	},
	{},
};

static struct macio_driver media_bay_driver =
{
	.name		= "media-bay",
	.match_table	= media_bay_match,
	.probe		= media_bay_attach,
	.suspend	= media_bay_suspend,
	.resume		= media_bay_resume
};

static int __init media_bay_init(void)
{
	int i;

	for (i=0; i<MAX_BAYS; i++) {
		memset((char *)&media_bays[i], 0, sizeof(struct media_bay_info));
		media_bays[i].content_id	= -1;
#ifdef CONFIG_BLK_DEV_IDE
		media_bays[i].cd_index		= -1;
#endif
	}
	if (_machine != _MACH_Pmac)
		return -ENODEV;

	macio_register_driver(&media_bay_driver);	

	return 0;
}

device_initcall(media_bay_init);