xref: /linux/drivers/macintosh/mediabay.c (revision 4413e16d9d21673bb5048a2e542f1aaa00015c2e)
1 /*
2  * Driver for the media bay on the PowerBook 3400 and 2400.
3  *
4  * Copyright (C) 1998 Paul Mackerras.
5  *
6  * Various evolutions by Benjamin Herrenschmidt & Henry Worth
7  *
8  *  This program is free software; you can redistribute it and/or
9  *  modify it under the terms of the GNU General Public License
10  *  as published by the Free Software Foundation; either version
11  *  2 of the License, or (at your option) any later version.
12  */
13 #include <linux/types.h>
14 #include <linux/errno.h>
15 #include <linux/kernel.h>
16 #include <linux/delay.h>
17 #include <linux/sched.h>
18 #include <linux/timer.h>
19 #include <linux/stddef.h>
20 #include <linux/init.h>
21 #include <linux/kthread.h>
22 #include <linux/mutex.h>
23 #include <asm/prom.h>
24 #include <asm/pgtable.h>
25 #include <asm/io.h>
26 #include <asm/machdep.h>
27 #include <asm/pmac_feature.h>
28 #include <asm/mediabay.h>
29 #include <asm/sections.h>
30 #include <asm/ohare.h>
31 #include <asm/heathrow.h>
32 #include <asm/keylargo.h>
33 #include <linux/adb.h>
34 #include <linux/pmu.h>
35 
36 #define MB_FCR32(bay, r)	((bay)->base + ((r) >> 2))
37 #define MB_FCR8(bay, r)		(((volatile u8 __iomem *)((bay)->base)) + (r))
38 
39 #define MB_IN32(bay,r)		(in_le32(MB_FCR32(bay,r)))
40 #define MB_OUT32(bay,r,v)	(out_le32(MB_FCR32(bay,r), (v)))
41 #define MB_BIS(bay,r,v)		(MB_OUT32((bay), (r), MB_IN32((bay), r) | (v)))
42 #define MB_BIC(bay,r,v)		(MB_OUT32((bay), (r), MB_IN32((bay), r) & ~(v)))
43 #define MB_IN8(bay,r)		(in_8(MB_FCR8(bay,r)))
44 #define MB_OUT8(bay,r,v)	(out_8(MB_FCR8(bay,r), (v)))
45 
46 struct media_bay_info;
47 
48 struct mb_ops {
49 	char*	name;
50 	void	(*init)(struct media_bay_info *bay);
51 	u8	(*content)(struct media_bay_info *bay);
52 	void	(*power)(struct media_bay_info *bay, int on_off);
53 	int	(*setup_bus)(struct media_bay_info *bay, u8 device_id);
54 	void	(*un_reset)(struct media_bay_info *bay);
55 	void	(*un_reset_ide)(struct media_bay_info *bay);
56 };
57 
58 struct media_bay_info {
59 	u32 __iomem			*base;
60 	int				content_id;
61 	int				state;
62 	int				last_value;
63 	int				value_count;
64 	int				timer;
65 	struct macio_dev		*mdev;
66 	const struct mb_ops*		ops;
67 	int				index;
68 	int				cached_gpio;
69 	int				sleeping;
70 	int				user_lock;
71 	struct mutex			lock;
72 };
73 
74 #define MAX_BAYS	2
75 
76 static struct media_bay_info media_bays[MAX_BAYS];
77 static int media_bay_count = 0;
78 
79 /*
80  * Wait that number of ms between each step in normal polling mode
81  */
82 #define MB_POLL_DELAY	25
83 
84 /*
85  * Consider the media-bay ID value stable if it is the same for
86  * this number of milliseconds
87  */
88 #define MB_STABLE_DELAY	100
89 
90 /* Wait after powering up the media bay this delay in ms
91  * timeout bumped for some powerbooks
92  */
93 #define MB_POWER_DELAY	200
94 
95 /*
96  * Hold the media-bay reset signal true for this many ticks
97  * after a device is inserted before releasing it.
98  */
99 #define MB_RESET_DELAY	50
100 
101 /*
102  * Wait this long after the reset signal is released and before doing
103  * further operations. After this delay, the IDE reset signal is released
104  * too for an IDE device
105  */
106 #define MB_SETUP_DELAY	100
107 
108 /*
109  * Wait this many ticks after an IDE device (e.g. CD-ROM) is inserted
110  * (or until the device is ready) before calling into the driver
111  */
112 #define MB_IDE_WAIT	1000
113 
114 /*
115  * States of a media bay
116  */
117 enum {
118 	mb_empty = 0,		/* Idle */
119 	mb_powering_up,		/* power bit set, waiting MB_POWER_DELAY */
120 	mb_enabling_bay,	/* enable bits set, waiting MB_RESET_DELAY */
121 	mb_resetting,		/* reset bit unset, waiting MB_SETUP_DELAY */
122 	mb_ide_resetting,	/* IDE reset bit unser, waiting MB_IDE_WAIT */
123 	mb_up,			/* Media bay full */
124 	mb_powering_down	/* Powering down (avoid too fast down/up) */
125 };
126 
127 #define MB_POWER_SOUND		0x08
128 #define MB_POWER_FLOPPY		0x04
129 #define MB_POWER_ATA		0x02
130 #define MB_POWER_PCI		0x01
131 #define MB_POWER_OFF		0x00
132 
133 /*
134  * Functions for polling content of media bay
135  */
136 
137 static u8
138 ohare_mb_content(struct media_bay_info *bay)
139 {
140 	return (MB_IN32(bay, OHARE_MBCR) >> 12) & 7;
141 }
142 
143 static u8
144 heathrow_mb_content(struct media_bay_info *bay)
145 {
146 	return (MB_IN32(bay, HEATHROW_MBCR) >> 12) & 7;
147 }
148 
149 static u8
150 keylargo_mb_content(struct media_bay_info *bay)
151 {
152 	int new_gpio;
153 
154 	new_gpio = MB_IN8(bay, KL_GPIO_MEDIABAY_IRQ) & KEYLARGO_GPIO_INPUT_DATA;
155 	if (new_gpio) {
156 		bay->cached_gpio = new_gpio;
157 		return MB_NO;
158 	} else if (bay->cached_gpio != new_gpio) {
159 		MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
160 		(void)MB_IN32(bay, KEYLARGO_MBCR);
161 		udelay(5);
162 		MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
163 		(void)MB_IN32(bay, KEYLARGO_MBCR);
164 		udelay(5);
165 		bay->cached_gpio = new_gpio;
166 	}
167 	return (MB_IN32(bay, KEYLARGO_MBCR) >> 4) & 7;
168 }
169 
170 /*
171  * Functions for powering up/down the bay, puts the bay device
172  * into reset state as well
173  */
174 
175 static void
176 ohare_mb_power(struct media_bay_info* bay, int on_off)
177 {
178 	if (on_off) {
179 		/* Power up device, assert it's reset line */
180 		MB_BIC(bay, OHARE_FCR, OH_BAY_RESET_N);
181 		MB_BIC(bay, OHARE_FCR, OH_BAY_POWER_N);
182 	} else {
183 		/* Disable all devices */
184 		MB_BIC(bay, OHARE_FCR, OH_BAY_DEV_MASK);
185 		MB_BIC(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
186 		/* Cut power from bay, release reset line */
187 		MB_BIS(bay, OHARE_FCR, OH_BAY_POWER_N);
188 		MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
189 		MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
190 	}
191 	MB_BIC(bay, OHARE_MBCR, 0x00000F00);
192 }
193 
194 static void
195 heathrow_mb_power(struct media_bay_info* bay, int on_off)
196 {
197 	if (on_off) {
198 		/* Power up device, assert it's reset line */
199 		MB_BIC(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
200 		MB_BIC(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
201 	} else {
202 		/* Disable all devices */
203 		MB_BIC(bay, HEATHROW_FCR, HRW_BAY_DEV_MASK);
204 		MB_BIC(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
205 		/* Cut power from bay, release reset line */
206 		MB_BIS(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
207 		MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
208 		MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
209 	}
210 	MB_BIC(bay, HEATHROW_MBCR, 0x00000F00);
211 }
212 
213 static void
214 keylargo_mb_power(struct media_bay_info* bay, int on_off)
215 {
216 	if (on_off) {
217 		/* Power up device, assert it's reset line */
218             	MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
219             	MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
220 	} else {
221 		/* Disable all devices */
222 		MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_MASK);
223 		MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
224 		/* Cut power from bay, release reset line */
225 		MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
226 		MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
227 		MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
228 	}
229 	MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
230 }
231 
232 /*
233  * Functions for configuring the media bay for a given type of device,
234  * enable the related busses
235  */
236 
237 static int
238 ohare_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
239 {
240 	switch(device_id) {
241 		case MB_FD:
242 		case MB_FD1:
243 			MB_BIS(bay, OHARE_FCR, OH_BAY_FLOPPY_ENABLE);
244 			MB_BIS(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
245 			return 0;
246 		case MB_CD:
247 			MB_BIC(bay, OHARE_FCR, OH_IDE1_RESET_N);
248 			MB_BIS(bay, OHARE_FCR, OH_BAY_IDE_ENABLE);
249 			return 0;
250 		case MB_PCI:
251 			MB_BIS(bay, OHARE_FCR, OH_BAY_PCI_ENABLE);
252 			return 0;
253 	}
254 	return -ENODEV;
255 }
256 
257 static int
258 heathrow_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
259 {
260 	switch(device_id) {
261 		case MB_FD:
262 		case MB_FD1:
263 			MB_BIS(bay, HEATHROW_FCR, HRW_BAY_FLOPPY_ENABLE);
264 			MB_BIS(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
265 			return 0;
266 		case MB_CD:
267 			MB_BIC(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
268 			MB_BIS(bay, HEATHROW_FCR, HRW_BAY_IDE_ENABLE);
269 			return 0;
270 		case MB_PCI:
271 			MB_BIS(bay, HEATHROW_FCR, HRW_BAY_PCI_ENABLE);
272 			return 0;
273 	}
274 	return -ENODEV;
275 }
276 
277 static int
278 keylargo_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
279 {
280 	switch(device_id) {
281 		case MB_CD:
282 			MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_IDE_ENABLE);
283 			MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
284 			MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
285 			return 0;
286 		case MB_PCI:
287 			MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_PCI_ENABLE);
288 			return 0;
289 		case MB_SOUND:
290 			MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_SOUND_ENABLE);
291 			return 0;
292 	}
293 	return -ENODEV;
294 }
295 
296 /*
297  * Functions for tweaking resets
298  */
299 
300 static void
301 ohare_mb_un_reset(struct media_bay_info* bay)
302 {
303 	MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
304 }
305 
306 static void keylargo_mb_init(struct media_bay_info *bay)
307 {
308 	MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
309 }
310 
311 static void heathrow_mb_un_reset(struct media_bay_info* bay)
312 {
313 	MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
314 }
315 
316 static void keylargo_mb_un_reset(struct media_bay_info* bay)
317 {
318 	MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
319 }
320 
321 static void ohare_mb_un_reset_ide(struct media_bay_info* bay)
322 {
323 	MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
324 }
325 
326 static void heathrow_mb_un_reset_ide(struct media_bay_info* bay)
327 {
328 	MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
329 }
330 
331 static void keylargo_mb_un_reset_ide(struct media_bay_info* bay)
332 {
333 	MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
334 }
335 
336 static inline void set_mb_power(struct media_bay_info* bay, int onoff)
337 {
338 	/* Power up up and assert the bay reset line */
339 	if (onoff) {
340 		bay->ops->power(bay, 1);
341 		bay->state = mb_powering_up;
342 		pr_debug("mediabay%d: powering up\n", bay->index);
343 	} else {
344 		/* Make sure everything is powered down & disabled */
345 		bay->ops->power(bay, 0);
346 		bay->state = mb_powering_down;
347 		pr_debug("mediabay%d: powering down\n", bay->index);
348 	}
349 	bay->timer = msecs_to_jiffies(MB_POWER_DELAY);
350 }
351 
352 static void poll_media_bay(struct media_bay_info* bay)
353 {
354 	int id = bay->ops->content(bay);
355 
356 	static char *mb_content_types[] = {
357 		"a floppy drive",
358 		"a floppy drive",
359 		"an unsupported audio device",
360 		"an ATA device",
361 		"an unsupported PCI device",
362 		"an unknown device",
363 	};
364 
365 	if (id != bay->last_value) {
366 		bay->last_value = id;
367 		bay->value_count = 0;
368 		return;
369 	}
370 	if (id == bay->content_id)
371 		return;
372 
373 	bay->value_count += msecs_to_jiffies(MB_POLL_DELAY);
374 	if (bay->value_count >= msecs_to_jiffies(MB_STABLE_DELAY)) {
375 		/* If the device type changes without going thru
376 		 * "MB_NO", we force a pass by "MB_NO" to make sure
377 		 * things are properly reset
378 		 */
379 		if ((id != MB_NO) && (bay->content_id != MB_NO)) {
380 			id = MB_NO;
381 			pr_debug("mediabay%d: forcing MB_NO\n", bay->index);
382 		}
383 		pr_debug("mediabay%d: switching to %d\n", bay->index, id);
384 		set_mb_power(bay, id != MB_NO);
385 		bay->content_id = id;
386 		if (id >= MB_NO || id < 0)
387 			printk(KERN_INFO "mediabay%d: Bay is now empty\n", bay->index);
388 		else
389 			printk(KERN_INFO "mediabay%d: Bay contains %s\n",
390 			       bay->index, mb_content_types[id]);
391 	}
392 }
393 
394 int check_media_bay(struct macio_dev *baydev)
395 {
396 	struct media_bay_info* bay;
397 	int id;
398 
399 	if (baydev == NULL)
400 		return MB_NO;
401 
402 	/* This returns an instant snapshot, not locking, sine
403 	 * we may be called with the bay lock held. The resulting
404 	 * fuzzyness of the result if called at the wrong time is
405 	 * not actually a huge deal
406 	 */
407 	bay = macio_get_drvdata(baydev);
408 	if (bay == NULL)
409 		return MB_NO;
410 	id = bay->content_id;
411 	if (bay->state != mb_up)
412 		return MB_NO;
413 	if (id == MB_FD1)
414 		return MB_FD;
415 	return id;
416 }
417 EXPORT_SYMBOL_GPL(check_media_bay);
418 
419 void lock_media_bay(struct macio_dev *baydev)
420 {
421 	struct media_bay_info* bay;
422 
423 	if (baydev == NULL)
424 		return;
425 	bay = macio_get_drvdata(baydev);
426 	if (bay == NULL)
427 		return;
428 	mutex_lock(&bay->lock);
429 	bay->user_lock = 1;
430 }
431 EXPORT_SYMBOL_GPL(lock_media_bay);
432 
433 void unlock_media_bay(struct macio_dev *baydev)
434 {
435 	struct media_bay_info* bay;
436 
437 	if (baydev == NULL)
438 		return;
439 	bay = macio_get_drvdata(baydev);
440 	if (bay == NULL)
441 		return;
442 	if (bay->user_lock) {
443 		bay->user_lock = 0;
444 		mutex_unlock(&bay->lock);
445 	}
446 }
447 EXPORT_SYMBOL_GPL(unlock_media_bay);
448 
449 static int mb_broadcast_hotplug(struct device *dev, void *data)
450 {
451 	struct media_bay_info* bay = data;
452 	struct macio_dev *mdev;
453 	struct macio_driver *drv;
454 	int state;
455 
456 	if (dev->bus != &macio_bus_type)
457 		return 0;
458 
459 	state = bay->state == mb_up ? bay->content_id : MB_NO;
460 	if (state == MB_FD1)
461 		state = MB_FD;
462 	mdev = to_macio_device(dev);
463 	drv = to_macio_driver(dev->driver);
464 	if (dev->driver && drv->mediabay_event)
465 		drv->mediabay_event(mdev, state);
466 	return 0;
467 }
468 
469 static void media_bay_step(int i)
470 {
471 	struct media_bay_info* bay = &media_bays[i];
472 
473 	/* We don't poll when powering down */
474 	if (bay->state != mb_powering_down)
475 	    poll_media_bay(bay);
476 
477 	/* If timer expired run state machine */
478 	if (bay->timer != 0) {
479 		bay->timer -= msecs_to_jiffies(MB_POLL_DELAY);
480 		if (bay->timer > 0)
481 			return;
482 		bay->timer = 0;
483 	}
484 
485 	switch(bay->state) {
486 	case mb_powering_up:
487 	    	if (bay->ops->setup_bus(bay, bay->last_value) < 0) {
488 			pr_debug("mediabay%d: device not supported (kind:%d)\n",
489 				 i, bay->content_id);
490 	    		set_mb_power(bay, 0);
491 	    		break;
492 	    	}
493 	    	bay->timer = msecs_to_jiffies(MB_RESET_DELAY);
494 	    	bay->state = mb_enabling_bay;
495 		pr_debug("mediabay%d: enabling (kind:%d)\n", i, bay->content_id);
496 		break;
497 	case mb_enabling_bay:
498 		bay->ops->un_reset(bay);
499 	    	bay->timer = msecs_to_jiffies(MB_SETUP_DELAY);
500 	    	bay->state = mb_resetting;
501 		pr_debug("mediabay%d: releasing bay reset (kind:%d)\n",
502 			 i, bay->content_id);
503 	    	break;
504 	case mb_resetting:
505 		if (bay->content_id != MB_CD) {
506 			pr_debug("mediabay%d: bay is up (kind:%d)\n", i,
507 				 bay->content_id);
508 			bay->state = mb_up;
509 			device_for_each_child(&bay->mdev->ofdev.dev,
510 					      bay, mb_broadcast_hotplug);
511 			break;
512 	    	}
513 		pr_debug("mediabay%d: releasing ATA reset (kind:%d)\n",
514 			 i, bay->content_id);
515 		bay->ops->un_reset_ide(bay);
516 	    	bay->timer = msecs_to_jiffies(MB_IDE_WAIT);
517 	    	bay->state = mb_ide_resetting;
518 	    	break;
519 
520 	case mb_ide_resetting:
521 		pr_debug("mediabay%d: bay is up (kind:%d)\n", i, bay->content_id);
522 		bay->state = mb_up;
523 		device_for_each_child(&bay->mdev->ofdev.dev,
524 				      bay, mb_broadcast_hotplug);
525 	    	break;
526 
527 	case mb_powering_down:
528 	    	bay->state = mb_empty;
529 		device_for_each_child(&bay->mdev->ofdev.dev,
530 				      bay, mb_broadcast_hotplug);
531 		pr_debug("mediabay%d: end of power down\n", i);
532 	    	break;
533 	}
534 }
535 
536 /*
537  * This procedure runs as a kernel thread to poll the media bay
538  * once each tick and register and unregister the IDE interface
539  * with the IDE driver.  It needs to be a thread because
540  * ide_register can't be called from interrupt context.
541  */
542 static int media_bay_task(void *x)
543 {
544 	int	i;
545 
546 	while (!kthread_should_stop()) {
547 		for (i = 0; i < media_bay_count; ++i) {
548 			mutex_lock(&media_bays[i].lock);
549 			if (!media_bays[i].sleeping)
550 				media_bay_step(i);
551 			mutex_unlock(&media_bays[i].lock);
552 		}
553 
554 		msleep_interruptible(MB_POLL_DELAY);
555 	}
556 	return 0;
557 }
558 
559 static int __devinit media_bay_attach(struct macio_dev *mdev, const struct of_device_id *match)
560 {
561 	struct media_bay_info* bay;
562 	u32 __iomem *regbase;
563 	struct device_node *ofnode;
564 	unsigned long base;
565 	int i;
566 
567 	ofnode = mdev->ofdev.dev.of_node;
568 
569 	if (macio_resource_count(mdev) < 1)
570 		return -ENODEV;
571 	if (macio_request_resources(mdev, "media-bay"))
572 		return -EBUSY;
573 	/* Media bay registers are located at the beginning of the
574          * mac-io chip, for now, we trick and align down the first
575 	 * resource passed in
576          */
577 	base = macio_resource_start(mdev, 0) & 0xffff0000u;
578 	regbase = (u32 __iomem *)ioremap(base, 0x100);
579 	if (regbase == NULL) {
580 		macio_release_resources(mdev);
581 		return -ENOMEM;
582 	}
583 
584 	i = media_bay_count++;
585 	bay = &media_bays[i];
586 	bay->mdev = mdev;
587 	bay->base = regbase;
588 	bay->index = i;
589 	bay->ops = match->data;
590 	bay->sleeping = 0;
591 	mutex_init(&bay->lock);
592 
593 	/* Init HW probing */
594 	if (bay->ops->init)
595 		bay->ops->init(bay);
596 
597 	printk(KERN_INFO "mediabay%d: Registered %s media-bay\n", i, bay->ops->name);
598 
599 	/* Force an immediate detect */
600 	set_mb_power(bay, 0);
601 	msleep(MB_POWER_DELAY);
602 	bay->content_id = MB_NO;
603 	bay->last_value = bay->ops->content(bay);
604 	bay->value_count = msecs_to_jiffies(MB_STABLE_DELAY);
605 	bay->state = mb_empty;
606 
607 	/* Mark us ready by filling our mdev data */
608 	macio_set_drvdata(mdev, bay);
609 
610 	/* Startup kernel thread */
611 	if (i == 0)
612 		kthread_run(media_bay_task, NULL, "media-bay");
613 
614 	return 0;
615 
616 }
617 
618 static int media_bay_suspend(struct macio_dev *mdev, pm_message_t state)
619 {
620 	struct media_bay_info	*bay = macio_get_drvdata(mdev);
621 
622 	if (state.event != mdev->ofdev.dev.power.power_state.event
623 	    && (state.event & PM_EVENT_SLEEP)) {
624 		mutex_lock(&bay->lock);
625 		bay->sleeping = 1;
626 		set_mb_power(bay, 0);
627 		mutex_unlock(&bay->lock);
628 		msleep(MB_POLL_DELAY);
629 		mdev->ofdev.dev.power.power_state = state;
630 	}
631 	return 0;
632 }
633 
634 static int media_bay_resume(struct macio_dev *mdev)
635 {
636 	struct media_bay_info	*bay = macio_get_drvdata(mdev);
637 
638 	if (mdev->ofdev.dev.power.power_state.event != PM_EVENT_ON) {
639 		mdev->ofdev.dev.power.power_state = PMSG_ON;
640 
641 	       	/* We re-enable the bay using it's previous content
642 	       	   only if it did not change. Note those bozo timings,
643 	       	   they seem to help the 3400 get it right.
644 	       	 */
645 	       	/* Force MB power to 0 */
646 		mutex_lock(&bay->lock);
647 	       	set_mb_power(bay, 0);
648 		msleep(MB_POWER_DELAY);
649 	       	if (bay->ops->content(bay) != bay->content_id) {
650 			printk("mediabay%d: Content changed during sleep...\n", bay->index);
651 			mutex_unlock(&bay->lock);
652 	       		return 0;
653 		}
654 	       	set_mb_power(bay, 1);
655 	       	bay->last_value = bay->content_id;
656 	       	bay->value_count = msecs_to_jiffies(MB_STABLE_DELAY);
657 	       	bay->timer = msecs_to_jiffies(MB_POWER_DELAY);
658 	       	do {
659 			msleep(MB_POLL_DELAY);
660 	       		media_bay_step(bay->index);
661 	       	} while((bay->state != mb_empty) &&
662 	       		(bay->state != mb_up));
663 		bay->sleeping = 0;
664 		mutex_unlock(&bay->lock);
665 	}
666 	return 0;
667 }
668 
669 
670 /* Definitions of "ops" structures.
671  */
672 static const struct mb_ops ohare_mb_ops = {
673 	.name		= "Ohare",
674 	.content	= ohare_mb_content,
675 	.power		= ohare_mb_power,
676 	.setup_bus	= ohare_mb_setup_bus,
677 	.un_reset	= ohare_mb_un_reset,
678 	.un_reset_ide	= ohare_mb_un_reset_ide,
679 };
680 
681 static const struct mb_ops heathrow_mb_ops = {
682 	.name		= "Heathrow",
683 	.content	= heathrow_mb_content,
684 	.power		= heathrow_mb_power,
685 	.setup_bus	= heathrow_mb_setup_bus,
686 	.un_reset	= heathrow_mb_un_reset,
687 	.un_reset_ide	= heathrow_mb_un_reset_ide,
688 };
689 
690 static const struct mb_ops keylargo_mb_ops = {
691 	.name		= "KeyLargo",
692 	.init		= keylargo_mb_init,
693 	.content	= keylargo_mb_content,
694 	.power		= keylargo_mb_power,
695 	.setup_bus	= keylargo_mb_setup_bus,
696 	.un_reset	= keylargo_mb_un_reset,
697 	.un_reset_ide	= keylargo_mb_un_reset_ide,
698 };
699 
700 /*
701  * It seems that the bit for the media-bay interrupt in the IRQ_LEVEL
702  * register is always set when there is something in the media bay.
703  * This causes problems for the interrupt code if we attach an interrupt
704  * handler to the media-bay interrupt, because it tends to go into
705  * an infinite loop calling the media bay interrupt handler.
706  * Therefore we do it all by polling the media bay once each tick.
707  */
708 
709 static struct of_device_id media_bay_match[] =
710 {
711 	{
712 	.name		= "media-bay",
713 	.compatible	= "keylargo-media-bay",
714 	.data		= &keylargo_mb_ops,
715 	},
716 	{
717 	.name		= "media-bay",
718 	.compatible	= "heathrow-media-bay",
719 	.data		= &heathrow_mb_ops,
720 	},
721 	{
722 	.name		= "media-bay",
723 	.compatible	= "ohare-media-bay",
724 	.data		= &ohare_mb_ops,
725 	},
726 	{},
727 };
728 
729 static struct macio_driver media_bay_driver =
730 {
731 	.driver = {
732 		.name		= "media-bay",
733 		.of_match_table	= media_bay_match,
734 	},
735 	.probe		= media_bay_attach,
736 	.suspend	= media_bay_suspend,
737 	.resume		= media_bay_resume
738 };
739 
740 static int __init media_bay_init(void)
741 {
742 	int i;
743 
744 	for (i=0; i<MAX_BAYS; i++) {
745 		memset((char *)&media_bays[i], 0, sizeof(struct media_bay_info));
746 		media_bays[i].content_id	= -1;
747 	}
748 	if (!machine_is(powermac))
749 		return 0;
750 
751 	macio_register_driver(&media_bay_driver);
752 
753 	return 0;
754 }
755 
756 device_initcall(media_bay_init);
757