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shm: Remove silly double assignment
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / macintosh / mediabay.c
blob82add26cc665d317d43cfcef389daab925164713
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);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree