xref: /openbmc/linux/drivers/macintosh/mediabay.c (revision 22246614)
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/hdreg.h>
20 #include <linux/stddef.h>
21 #include <linux/init.h>
22 #include <linux/ide.h>
23 #include <linux/kthread.h>
24 #include <asm/prom.h>
25 #include <asm/pgtable.h>
26 #include <asm/io.h>
27 #include <asm/machdep.h>
28 #include <asm/pmac_feature.h>
29 #include <asm/mediabay.h>
30 #include <asm/sections.h>
31 #include <asm/ohare.h>
32 #include <asm/heathrow.h>
33 #include <asm/keylargo.h>
34 #include <linux/adb.h>
35 #include <linux/pmu.h>
36 
37 
38 #define MB_DEBUG
39 
40 #ifdef MB_DEBUG
41 #define MBDBG(fmt, arg...)	printk(KERN_INFO fmt , ## arg)
42 #else
43 #define MBDBG(fmt, arg...)	do { } while (0)
44 #endif
45 
46 #define MB_FCR32(bay, r)	((bay)->base + ((r) >> 2))
47 #define MB_FCR8(bay, r)		(((volatile u8 __iomem *)((bay)->base)) + (r))
48 
49 #define MB_IN32(bay,r)		(in_le32(MB_FCR32(bay,r)))
50 #define MB_OUT32(bay,r,v)	(out_le32(MB_FCR32(bay,r), (v)))
51 #define MB_BIS(bay,r,v)		(MB_OUT32((bay), (r), MB_IN32((bay), r) | (v)))
52 #define MB_BIC(bay,r,v)		(MB_OUT32((bay), (r), MB_IN32((bay), r) & ~(v)))
53 #define MB_IN8(bay,r)		(in_8(MB_FCR8(bay,r)))
54 #define MB_OUT8(bay,r,v)	(out_8(MB_FCR8(bay,r), (v)))
55 
56 struct media_bay_info;
57 
58 struct mb_ops {
59 	char*	name;
60 	void	(*init)(struct media_bay_info *bay);
61 	u8	(*content)(struct media_bay_info *bay);
62 	void	(*power)(struct media_bay_info *bay, int on_off);
63 	int	(*setup_bus)(struct media_bay_info *bay, u8 device_id);
64 	void	(*un_reset)(struct media_bay_info *bay);
65 	void	(*un_reset_ide)(struct media_bay_info *bay);
66 };
67 
68 struct media_bay_info {
69 	u32 __iomem			*base;
70 	int				content_id;
71 	int				state;
72 	int				last_value;
73 	int				value_count;
74 	int				timer;
75 	struct macio_dev		*mdev;
76 	struct mb_ops*			ops;
77 	int				index;
78 	int				cached_gpio;
79 	int				sleeping;
80 	struct semaphore		lock;
81 #ifdef CONFIG_BLK_DEV_IDE_PMAC
82 	ide_hwif_t			*cd_port;
83 	void __iomem			*cd_base;
84 	int				cd_irq;
85 	int				cd_retry;
86 #endif
87 #if defined(CONFIG_BLK_DEV_IDE_PMAC) || defined(CONFIG_MAC_FLOPPY)
88 	int 				cd_index;
89 #endif
90 };
91 
92 #define MAX_BAYS	2
93 
94 static struct media_bay_info media_bays[MAX_BAYS];
95 int media_bay_count = 0;
96 
97 #ifdef CONFIG_BLK_DEV_IDE_PMAC
98 /* check the busy bit in the media-bay ide interface
99    (assumes the media-bay contains an ide device) */
100 #define MB_IDE_READY(i)	((readb(media_bays[i].cd_base + 0x70) & 0x80) == 0)
101 #endif
102 
103 /*
104  * Wait that number of ms between each step in normal polling mode
105  */
106 #define MB_POLL_DELAY	25
107 
108 /*
109  * Consider the media-bay ID value stable if it is the same for
110  * this number of milliseconds
111  */
112 #define MB_STABLE_DELAY	100
113 
114 /* Wait after powering up the media bay this delay in ms
115  * timeout bumped for some powerbooks
116  */
117 #define MB_POWER_DELAY	200
118 
119 /*
120  * Hold the media-bay reset signal true for this many ticks
121  * after a device is inserted before releasing it.
122  */
123 #define MB_RESET_DELAY	50
124 
125 /*
126  * Wait this long after the reset signal is released and before doing
127  * further operations. After this delay, the IDE reset signal is released
128  * too for an IDE device
129  */
130 #define MB_SETUP_DELAY	100
131 
132 /*
133  * Wait this many ticks after an IDE device (e.g. CD-ROM) is inserted
134  * (or until the device is ready) before waiting for busy bit to disappear
135  */
136 #define MB_IDE_WAIT	1000
137 
138 /*
139  * Timeout waiting for busy bit of an IDE device to go down
140  */
141 #define MB_IDE_TIMEOUT	5000
142 
143 /*
144  * Max retries of the full power up/down sequence for an IDE device
145  */
146 #define MAX_CD_RETRIES	3
147 
148 /*
149  * States of a media bay
150  */
151 enum {
152 	mb_empty = 0,		/* Idle */
153 	mb_powering_up,		/* power bit set, waiting MB_POWER_DELAY */
154 	mb_enabling_bay,	/* enable bits set, waiting MB_RESET_DELAY */
155 	mb_resetting,		/* reset bit unset, waiting MB_SETUP_DELAY */
156 	mb_ide_resetting,	/* IDE reset bit unser, waiting MB_IDE_WAIT */
157 	mb_ide_waiting,		/* Waiting for BUSY bit to go away until MB_IDE_TIMEOUT */
158 	mb_up,			/* Media bay full */
159 	mb_powering_down	/* Powering down (avoid too fast down/up) */
160 };
161 
162 #define MB_POWER_SOUND		0x08
163 #define MB_POWER_FLOPPY		0x04
164 #define MB_POWER_ATA		0x02
165 #define MB_POWER_PCI		0x01
166 #define MB_POWER_OFF		0x00
167 
168 /*
169  * Functions for polling content of media bay
170  */
171 
172 static u8
173 ohare_mb_content(struct media_bay_info *bay)
174 {
175 	return (MB_IN32(bay, OHARE_MBCR) >> 12) & 7;
176 }
177 
178 static u8
179 heathrow_mb_content(struct media_bay_info *bay)
180 {
181 	return (MB_IN32(bay, HEATHROW_MBCR) >> 12) & 7;
182 }
183 
184 static u8
185 keylargo_mb_content(struct media_bay_info *bay)
186 {
187 	int new_gpio;
188 
189 	new_gpio = MB_IN8(bay, KL_GPIO_MEDIABAY_IRQ) & KEYLARGO_GPIO_INPUT_DATA;
190 	if (new_gpio) {
191 		bay->cached_gpio = new_gpio;
192 		return MB_NO;
193 	} else if (bay->cached_gpio != new_gpio) {
194 		MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
195 		(void)MB_IN32(bay, KEYLARGO_MBCR);
196 		udelay(5);
197 		MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
198 		(void)MB_IN32(bay, KEYLARGO_MBCR);
199 		udelay(5);
200 		bay->cached_gpio = new_gpio;
201 	}
202 	return (MB_IN32(bay, KEYLARGO_MBCR) >> 4) & 7;
203 }
204 
205 /*
206  * Functions for powering up/down the bay, puts the bay device
207  * into reset state as well
208  */
209 
210 static void
211 ohare_mb_power(struct media_bay_info* bay, int on_off)
212 {
213 	if (on_off) {
214 		/* Power up device, assert it's reset line */
215 		MB_BIC(bay, OHARE_FCR, OH_BAY_RESET_N);
216 		MB_BIC(bay, OHARE_FCR, OH_BAY_POWER_N);
217 	} else {
218 		/* Disable all devices */
219 		MB_BIC(bay, OHARE_FCR, OH_BAY_DEV_MASK);
220 		MB_BIC(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
221 		/* Cut power from bay, release reset line */
222 		MB_BIS(bay, OHARE_FCR, OH_BAY_POWER_N);
223 		MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
224 		MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
225 	}
226 	MB_BIC(bay, OHARE_MBCR, 0x00000F00);
227 }
228 
229 static void
230 heathrow_mb_power(struct media_bay_info* bay, int on_off)
231 {
232 	if (on_off) {
233 		/* Power up device, assert it's reset line */
234 		MB_BIC(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
235 		MB_BIC(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
236 	} else {
237 		/* Disable all devices */
238 		MB_BIC(bay, HEATHROW_FCR, HRW_BAY_DEV_MASK);
239 		MB_BIC(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
240 		/* Cut power from bay, release reset line */
241 		MB_BIS(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
242 		MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
243 		MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
244 	}
245 	MB_BIC(bay, HEATHROW_MBCR, 0x00000F00);
246 }
247 
248 static void
249 keylargo_mb_power(struct media_bay_info* bay, int on_off)
250 {
251 	if (on_off) {
252 		/* Power up device, assert it's reset line */
253             	MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
254             	MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
255 	} else {
256 		/* Disable all devices */
257 		MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_MASK);
258 		MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
259 		/* Cut power from bay, release reset line */
260 		MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
261 		MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
262 		MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
263 	}
264 	MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
265 }
266 
267 /*
268  * Functions for configuring the media bay for a given type of device,
269  * enable the related busses
270  */
271 
272 static int
273 ohare_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
274 {
275 	switch(device_id) {
276 		case MB_FD:
277 		case MB_FD1:
278 			MB_BIS(bay, OHARE_FCR, OH_BAY_FLOPPY_ENABLE);
279 			MB_BIS(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
280 			return 0;
281 		case MB_CD:
282 			MB_BIC(bay, OHARE_FCR, OH_IDE1_RESET_N);
283 			MB_BIS(bay, OHARE_FCR, OH_BAY_IDE_ENABLE);
284 			return 0;
285 		case MB_PCI:
286 			MB_BIS(bay, OHARE_FCR, OH_BAY_PCI_ENABLE);
287 			return 0;
288 	}
289 	return -ENODEV;
290 }
291 
292 static int
293 heathrow_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
294 {
295 	switch(device_id) {
296 		case MB_FD:
297 		case MB_FD1:
298 			MB_BIS(bay, HEATHROW_FCR, HRW_BAY_FLOPPY_ENABLE);
299 			MB_BIS(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
300 			return 0;
301 		case MB_CD:
302 			MB_BIC(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
303 			MB_BIS(bay, HEATHROW_FCR, HRW_BAY_IDE_ENABLE);
304 			return 0;
305 		case MB_PCI:
306 			MB_BIS(bay, HEATHROW_FCR, HRW_BAY_PCI_ENABLE);
307 			return 0;
308 	}
309 	return -ENODEV;
310 }
311 
312 static int
313 keylargo_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
314 {
315 	switch(device_id) {
316 		case MB_CD:
317 			MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_IDE_ENABLE);
318 			MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
319 			MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
320 			return 0;
321 		case MB_PCI:
322 			MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_PCI_ENABLE);
323 			return 0;
324 		case MB_SOUND:
325 			MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_SOUND_ENABLE);
326 			return 0;
327 	}
328 	return -ENODEV;
329 }
330 
331 /*
332  * Functions for tweaking resets
333  */
334 
335 static void
336 ohare_mb_un_reset(struct media_bay_info* bay)
337 {
338 	MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
339 }
340 
341 static void keylargo_mb_init(struct media_bay_info *bay)
342 {
343 	MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
344 }
345 
346 static void heathrow_mb_un_reset(struct media_bay_info* bay)
347 {
348 	MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
349 }
350 
351 static void keylargo_mb_un_reset(struct media_bay_info* bay)
352 {
353 	MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
354 }
355 
356 static void ohare_mb_un_reset_ide(struct media_bay_info* bay)
357 {
358 	MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
359 }
360 
361 static void heathrow_mb_un_reset_ide(struct media_bay_info* bay)
362 {
363 	MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
364 }
365 
366 static void keylargo_mb_un_reset_ide(struct media_bay_info* bay)
367 {
368 	MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
369 }
370 
371 static inline void set_mb_power(struct media_bay_info* bay, int onoff)
372 {
373 	/* Power up up and assert the bay reset line */
374 	if (onoff) {
375 		bay->ops->power(bay, 1);
376 		bay->state = mb_powering_up;
377 		MBDBG("mediabay%d: powering up\n", bay->index);
378 	} else {
379 		/* Make sure everything is powered down & disabled */
380 		bay->ops->power(bay, 0);
381 		bay->state = mb_powering_down;
382 		MBDBG("mediabay%d: powering down\n", bay->index);
383 	}
384 	bay->timer = msecs_to_jiffies(MB_POWER_DELAY);
385 }
386 
387 static void poll_media_bay(struct media_bay_info* bay)
388 {
389 	int id = bay->ops->content(bay);
390 
391 	if (id == bay->last_value) {
392 		if (id != bay->content_id) {
393 			bay->value_count += msecs_to_jiffies(MB_POLL_DELAY);
394 			if (bay->value_count >= msecs_to_jiffies(MB_STABLE_DELAY)) {
395 				/* If the device type changes without going thru
396 				 * "MB_NO", we force a pass by "MB_NO" to make sure
397 				 * things are properly reset
398 				 */
399 				if ((id != MB_NO) && (bay->content_id != MB_NO)) {
400 					id = MB_NO;
401 					MBDBG("mediabay%d: forcing MB_NO\n", bay->index);
402 				}
403 				MBDBG("mediabay%d: switching to %d\n", bay->index, id);
404 				set_mb_power(bay, id != MB_NO);
405 				bay->content_id = id;
406 				if (id == MB_NO) {
407 #ifdef CONFIG_BLK_DEV_IDE_PMAC
408 					bay->cd_retry = 0;
409 #endif
410 					printk(KERN_INFO "media bay %d is empty\n", bay->index);
411 				}
412 			}
413 		}
414 	} else {
415 		bay->last_value = id;
416 		bay->value_count = 0;
417 	}
418 }
419 
420 int check_media_bay(struct device_node *which_bay, int what)
421 {
422 	int	i;
423 
424 	for (i=0; i<media_bay_count; i++)
425 		if (media_bays[i].mdev && which_bay == media_bays[i].mdev->ofdev.node) {
426 			if ((what == media_bays[i].content_id) && media_bays[i].state == mb_up)
427 				return 0;
428 			media_bays[i].cd_index = -1;
429 			return -EINVAL;
430 		}
431 	return -ENODEV;
432 }
433 EXPORT_SYMBOL(check_media_bay);
434 
435 #ifdef CONFIG_BLK_DEV_IDE_PMAC
436 int check_media_bay_by_base(unsigned long base, int what)
437 {
438 	int	i;
439 
440 	for (i=0; i<media_bay_count; i++)
441 		if (media_bays[i].mdev && base == (unsigned long) media_bays[i].cd_base) {
442 			if ((what == media_bays[i].content_id) && media_bays[i].state == mb_up)
443 				return 0;
444 			media_bays[i].cd_index = -1;
445 			return -EINVAL;
446 		}
447 
448 	return -ENODEV;
449 }
450 
451 int media_bay_set_ide_infos(struct device_node* which_bay, unsigned long base,
452 			    int irq, ide_hwif_t *hwif)
453 {
454 	int	i;
455 
456 	for (i=0; i<media_bay_count; i++) {
457 		struct media_bay_info* bay = &media_bays[i];
458 
459 		if (bay->mdev && which_bay == bay->mdev->ofdev.node) {
460 			int timeout = 5000, index = hwif->index;
461 
462 			down(&bay->lock);
463 
464 			bay->cd_port	= hwif;
465  			bay->cd_base	= (void __iomem *) base;
466 			bay->cd_irq	= irq;
467 
468 			if ((MB_CD != bay->content_id) || bay->state != mb_up) {
469 				up(&bay->lock);
470 				return 0;
471 			}
472 			printk(KERN_DEBUG "Registered ide%d for media bay %d\n", index, i);
473 			do {
474 				if (MB_IDE_READY(i)) {
475 					bay->cd_index	= index;
476 					up(&bay->lock);
477 					return 0;
478 				}
479 				mdelay(1);
480 			} while(--timeout);
481 			printk(KERN_DEBUG "Timeount waiting IDE in bay %d\n", i);
482 			up(&bay->lock);
483 			return -ENODEV;
484 		}
485 	}
486 
487 	return -ENODEV;
488 }
489 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
490 
491 static void media_bay_step(int i)
492 {
493 	struct media_bay_info* bay = &media_bays[i];
494 
495 	/* We don't poll when powering down */
496 	if (bay->state != mb_powering_down)
497 	    poll_media_bay(bay);
498 
499 	/* If timer expired or polling IDE busy, run state machine */
500 	if ((bay->state != mb_ide_waiting) && (bay->timer != 0)) {
501 		bay->timer -= msecs_to_jiffies(MB_POLL_DELAY);
502 		if (bay->timer > 0)
503 			return;
504 		bay->timer = 0;
505 	}
506 
507 	switch(bay->state) {
508 	case mb_powering_up:
509 	    	if (bay->ops->setup_bus(bay, bay->last_value) < 0) {
510 			MBDBG("mediabay%d: device not supported (kind:%d)\n", i, bay->content_id);
511 	    		set_mb_power(bay, 0);
512 	    		break;
513 	    	}
514 	    	bay->timer = msecs_to_jiffies(MB_RESET_DELAY);
515 	    	bay->state = mb_enabling_bay;
516 		MBDBG("mediabay%d: enabling (kind:%d)\n", i, bay->content_id);
517 		break;
518 	case mb_enabling_bay:
519 		bay->ops->un_reset(bay);
520 	    	bay->timer = msecs_to_jiffies(MB_SETUP_DELAY);
521 	    	bay->state = mb_resetting;
522 		MBDBG("mediabay%d: waiting reset (kind:%d)\n", i, bay->content_id);
523 	    	break;
524 	case mb_resetting:
525 		if (bay->content_id != MB_CD) {
526 			MBDBG("mediabay%d: bay is up (kind:%d)\n", i, bay->content_id);
527 			bay->state = mb_up;
528 			break;
529 	    	}
530 #ifdef CONFIG_BLK_DEV_IDE_PMAC
531 		MBDBG("mediabay%d: waiting IDE reset (kind:%d)\n", i, bay->content_id);
532 		bay->ops->un_reset_ide(bay);
533 	    	bay->timer = msecs_to_jiffies(MB_IDE_WAIT);
534 	    	bay->state = mb_ide_resetting;
535 #else
536 		printk(KERN_DEBUG "media-bay %d is ide (not compiled in kernel)\n", i);
537 		set_mb_power(bay, 0);
538 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
539 	    	break;
540 #ifdef CONFIG_BLK_DEV_IDE_PMAC
541 	case mb_ide_resetting:
542 	    	bay->timer = msecs_to_jiffies(MB_IDE_TIMEOUT);
543 	    	bay->state = mb_ide_waiting;
544 		MBDBG("mediabay%d: waiting IDE ready (kind:%d)\n", i, bay->content_id);
545 	    	break;
546 	case mb_ide_waiting:
547 		if (bay->cd_base == NULL) {
548 			bay->timer = 0;
549 			bay->state = mb_up;
550 			MBDBG("mediabay%d: up before IDE init\n", i);
551 			break;
552 		} else if (MB_IDE_READY(i)) {
553 			bay->timer = 0;
554 			bay->state = mb_up;
555 			if (bay->cd_index < 0) {
556 				printk("mediabay %d, registering IDE...\n", i);
557 				pmu_suspend();
558 				ide_port_scan(bay->cd_port);
559 				bay->cd_index = bay->cd_port->index;
560 				pmu_resume();
561 			}
562 			if (bay->cd_index == -1) {
563 				/* We eventually do a retry */
564 				bay->cd_retry++;
565 				printk("IDE register error\n");
566 				set_mb_power(bay, 0);
567 			} else {
568 				printk(KERN_DEBUG "media-bay %d is ide%d\n", i, bay->cd_index);
569 				MBDBG("mediabay %d IDE ready\n", i);
570 			}
571 			break;
572 	    	} else if (bay->timer > 0)
573 			bay->timer -= msecs_to_jiffies(MB_POLL_DELAY);
574 	    	if (bay->timer <= 0) {
575 			printk("\nIDE Timeout in bay %d !, IDE state is: 0x%02x\n",
576 			       i, readb(bay->cd_base + 0x70));
577 			MBDBG("mediabay%d: nIDE Timeout !\n", i);
578 			set_mb_power(bay, 0);
579 			bay->timer = 0;
580 	    	}
581 		break;
582 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
583 	case mb_powering_down:
584 	    	bay->state = mb_empty;
585 #ifdef CONFIG_BLK_DEV_IDE_PMAC
586     	        if (bay->cd_index >= 0) {
587 			printk(KERN_DEBUG "Unregistering mb %d ide, index:%d\n", i,
588 			       bay->cd_index);
589 			ide_port_unregister_devices(bay->cd_port);
590 			bay->cd_index = -1;
591 		}
592 	    	if (bay->cd_retry) {
593 			if (bay->cd_retry > MAX_CD_RETRIES) {
594 				/* Should add an error sound (sort of beep in dmasound) */
595 				printk("\nmedia-bay %d, IDE device badly inserted or unrecognised\n", i);
596 			} else {
597 				/* Force a new power down/up sequence */
598 				bay->content_id = MB_NO;
599 			}
600 	    	}
601 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
602 		MBDBG("mediabay%d: end of power down\n", i);
603 	    	break;
604 	}
605 }
606 
607 /*
608  * This procedure runs as a kernel thread to poll the media bay
609  * once each tick and register and unregister the IDE interface
610  * with the IDE driver.  It needs to be a thread because
611  * ide_register can't be called from interrupt context.
612  */
613 static int media_bay_task(void *x)
614 {
615 	int	i;
616 
617 	while (!kthread_should_stop()) {
618 		for (i = 0; i < media_bay_count; ++i) {
619 			down(&media_bays[i].lock);
620 			if (!media_bays[i].sleeping)
621 				media_bay_step(i);
622 			up(&media_bays[i].lock);
623 		}
624 
625 		msleep_interruptible(MB_POLL_DELAY);
626 	}
627 	return 0;
628 }
629 
630 static int __devinit media_bay_attach(struct macio_dev *mdev, const struct of_device_id *match)
631 {
632 	struct media_bay_info* bay;
633 	u32 __iomem *regbase;
634 	struct device_node *ofnode;
635 	unsigned long base;
636 	int i;
637 
638 	ofnode = mdev->ofdev.node;
639 
640 	if (macio_resource_count(mdev) < 1)
641 		return -ENODEV;
642 	if (macio_request_resources(mdev, "media-bay"))
643 		return -EBUSY;
644 	/* Media bay registers are located at the beginning of the
645          * mac-io chip, for now, we trick and align down the first
646 	 * resource passed in
647          */
648 	base = macio_resource_start(mdev, 0) & 0xffff0000u;
649 	regbase = (u32 __iomem *)ioremap(base, 0x100);
650 	if (regbase == NULL) {
651 		macio_release_resources(mdev);
652 		return -ENOMEM;
653 	}
654 
655 	i = media_bay_count++;
656 	bay = &media_bays[i];
657 	bay->mdev = mdev;
658 	bay->base = regbase;
659 	bay->index = i;
660 	bay->ops = match->data;
661 	bay->sleeping = 0;
662 	init_MUTEX(&bay->lock);
663 
664 	/* Init HW probing */
665 	if (bay->ops->init)
666 		bay->ops->init(bay);
667 
668 	printk(KERN_INFO "mediabay%d: Registered %s media-bay\n", i, bay->ops->name);
669 
670 	/* Force an immediate detect */
671 	set_mb_power(bay, 0);
672 	msleep(MB_POWER_DELAY);
673 	bay->content_id = MB_NO;
674 	bay->last_value = bay->ops->content(bay);
675 	bay->value_count = msecs_to_jiffies(MB_STABLE_DELAY);
676 	bay->state = mb_empty;
677 	do {
678 		msleep(MB_POLL_DELAY);
679 		media_bay_step(i);
680 	} while((bay->state != mb_empty) &&
681 		(bay->state != mb_up));
682 
683 	/* Mark us ready by filling our mdev data */
684 	macio_set_drvdata(mdev, bay);
685 
686 	/* Startup kernel thread */
687 	if (i == 0)
688 		kthread_run(media_bay_task, NULL, "media-bay");
689 
690 	return 0;
691 
692 }
693 
694 static int media_bay_suspend(struct macio_dev *mdev, pm_message_t state)
695 {
696 	struct media_bay_info	*bay = macio_get_drvdata(mdev);
697 
698 	if (state.event != mdev->ofdev.dev.power.power_state.event
699 	    && (state.event & PM_EVENT_SLEEP)) {
700 		down(&bay->lock);
701 		bay->sleeping = 1;
702 		set_mb_power(bay, 0);
703 		up(&bay->lock);
704 		msleep(MB_POLL_DELAY);
705 		mdev->ofdev.dev.power.power_state = state;
706 	}
707 	return 0;
708 }
709 
710 static int media_bay_resume(struct macio_dev *mdev)
711 {
712 	struct media_bay_info	*bay = macio_get_drvdata(mdev);
713 
714 	if (mdev->ofdev.dev.power.power_state.event != PM_EVENT_ON) {
715 		mdev->ofdev.dev.power.power_state = PMSG_ON;
716 
717 	       	/* We re-enable the bay using it's previous content
718 	       	   only if it did not change. Note those bozo timings,
719 	       	   they seem to help the 3400 get it right.
720 	       	 */
721 	       	/* Force MB power to 0 */
722 		down(&bay->lock);
723 	       	set_mb_power(bay, 0);
724 		msleep(MB_POWER_DELAY);
725 	       	if (bay->ops->content(bay) != bay->content_id) {
726 			printk("mediabay%d: content changed during sleep...\n", bay->index);
727 			up(&bay->lock);
728 	       		return 0;
729 		}
730 	       	set_mb_power(bay, 1);
731 	       	bay->last_value = bay->content_id;
732 	       	bay->value_count = msecs_to_jiffies(MB_STABLE_DELAY);
733 	       	bay->timer = msecs_to_jiffies(MB_POWER_DELAY);
734 #ifdef CONFIG_BLK_DEV_IDE_PMAC
735 	       	bay->cd_retry = 0;
736 #endif
737 	       	do {
738 			msleep(MB_POLL_DELAY);
739 	       		media_bay_step(bay->index);
740 	       	} while((bay->state != mb_empty) &&
741 	       		(bay->state != mb_up));
742 		bay->sleeping = 0;
743 		up(&bay->lock);
744 	}
745 	return 0;
746 }
747 
748 
749 /* Definitions of "ops" structures.
750  */
751 static struct mb_ops ohare_mb_ops = {
752 	.name		= "Ohare",
753 	.content	= ohare_mb_content,
754 	.power		= ohare_mb_power,
755 	.setup_bus	= ohare_mb_setup_bus,
756 	.un_reset	= ohare_mb_un_reset,
757 	.un_reset_ide	= ohare_mb_un_reset_ide,
758 };
759 
760 static struct mb_ops heathrow_mb_ops = {
761 	.name		= "Heathrow",
762 	.content	= heathrow_mb_content,
763 	.power		= heathrow_mb_power,
764 	.setup_bus	= heathrow_mb_setup_bus,
765 	.un_reset	= heathrow_mb_un_reset,
766 	.un_reset_ide	= heathrow_mb_un_reset_ide,
767 };
768 
769 static struct mb_ops keylargo_mb_ops = {
770 	.name		= "KeyLargo",
771 	.init		= keylargo_mb_init,
772 	.content	= keylargo_mb_content,
773 	.power		= keylargo_mb_power,
774 	.setup_bus	= keylargo_mb_setup_bus,
775 	.un_reset	= keylargo_mb_un_reset,
776 	.un_reset_ide	= keylargo_mb_un_reset_ide,
777 };
778 
779 /*
780  * It seems that the bit for the media-bay interrupt in the IRQ_LEVEL
781  * register is always set when there is something in the media bay.
782  * This causes problems for the interrupt code if we attach an interrupt
783  * handler to the media-bay interrupt, because it tends to go into
784  * an infinite loop calling the media bay interrupt handler.
785  * Therefore we do it all by polling the media bay once each tick.
786  */
787 
788 static struct of_device_id media_bay_match[] =
789 {
790 	{
791 	.name		= "media-bay",
792 	.compatible	= "keylargo-media-bay",
793 	.data		= &keylargo_mb_ops,
794 	},
795 	{
796 	.name		= "media-bay",
797 	.compatible	= "heathrow-media-bay",
798 	.data		= &heathrow_mb_ops,
799 	},
800 	{
801 	.name		= "media-bay",
802 	.compatible	= "ohare-media-bay",
803 	.data		= &ohare_mb_ops,
804 	},
805 	{},
806 };
807 
808 static struct macio_driver media_bay_driver =
809 {
810 	.name		= "media-bay",
811 	.match_table	= media_bay_match,
812 	.probe		= media_bay_attach,
813 	.suspend	= media_bay_suspend,
814 	.resume		= media_bay_resume
815 };
816 
817 static int __init media_bay_init(void)
818 {
819 	int i;
820 
821 	for (i=0; i<MAX_BAYS; i++) {
822 		memset((char *)&media_bays[i], 0, sizeof(struct media_bay_info));
823 		media_bays[i].content_id	= -1;
824 #ifdef CONFIG_BLK_DEV_IDE_PMAC
825 		media_bays[i].cd_index		= -1;
826 #endif
827 	}
828 	if (!machine_is(powermac))
829 		return 0;
830 
831 	macio_register_driver(&media_bay_driver);
832 
833 	return 0;
834 }
835 
836 device_initcall(media_bay_init);
837