Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
mediabay.c
Go to the documentation of this file.
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);
Generated on Thu Jan 10 2013 13:43:18 for Linux Kernel by   doxygen 1.8.2