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PCI: add an option to allow ASPM enabled forcibly
[linux-2.6/next.git] / drivers / ide / ide.c
blob772451600e4d96064b57f8732a7579481ee2b3a1
1 /*
2 * Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
3 * Copyright (C) 2003-2005, 2007 Bartlomiej Zolnierkiewicz
4 */
5
6 /*
7 * Mostly written by Mark Lord <mlord@pobox.com>
8 * and Gadi Oxman <gadio@netvision.net.il>
9 * and Andre Hedrick <andre@linux-ide.org>
10 *
11 * See linux/MAINTAINERS for address of current maintainer.
12 *
13 * This is the multiple IDE interface driver, as evolved from hd.c.
14 * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
15 * (usually 14 & 15).
16 * There can be up to two drives per interface, as per the ATA-2 spec.
17 *
18 * ...
19 *
20 * From hd.c:
21 * |
22 * | It traverses the request-list, using interrupts to jump between functions.
23 * | As nearly all functions can be called within interrupts, we may not sleep.
24 * | Special care is recommended. Have Fun!
25 * |
26 * | modified by Drew Eckhardt to check nr of hd's from the CMOS.
27 * |
28 * | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
29 * | in the early extended-partition checks and added DM partitions.
30 * |
31 * | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
32 * |
33 * | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
34 * | and general streamlining by Mark Lord (mlord@pobox.com).
35 *
36 * October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
37 *
38 * Mark Lord (mlord@pobox.com) (IDE Perf.Pkg)
39 * Delman Lee (delman@ieee.org) ("Mr. atdisk2")
40 * Scott Snyder (snyder@fnald0.fnal.gov) (ATAPI IDE cd-rom)
41 *
42 * This was a rewrite of just about everything from hd.c, though some original
43 * code is still sprinkled about. Think of it as a major evolution, with
44 * inspiration from lots of linux users, esp. hamish@zot.apana.org.au
45 */
46
47 #define _IDE_C /* Tell ide.h it's really us */
48
49 #include <linux/module.h>
50 #include <linux/types.h>
51 #include <linux/string.h>
52 #include <linux/kernel.h>
53 #include <linux/interrupt.h>
54 #include <linux/major.h>
55 #include <linux/errno.h>
56 #include <linux/genhd.h>
57 #include <linux/slab.h>
58 #include <linux/init.h>
59 #include <linux/pci.h>
60 #include <linux/ide.h>
61 #include <linux/completion.h>
62 #include <linux/device.h>
63
64
65 /* default maximum number of failures */
66 #define IDE_DEFAULT_MAX_FAILURES 1
67
68 struct class *ide_port_class;
69
70 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
71 IDE2_MAJOR, IDE3_MAJOR,
72 IDE4_MAJOR, IDE5_MAJOR,
73 IDE6_MAJOR, IDE7_MAJOR,
74 IDE8_MAJOR, IDE9_MAJOR };
75
76 DEFINE_MUTEX(ide_cfg_mtx);
77
78 __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
79 EXPORT_SYMBOL(ide_lock);
80
81 static void ide_port_init_devices_data(ide_hwif_t *);
82
83 /*
84 * Do not even *think* about calling this!
85 */
86 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
87 {
88 /* bulk initialize hwif & drive info with zeros */
89 memset(hwif, 0, sizeof(ide_hwif_t));
90
91 /* fill in any non-zero initial values */
92 hwif->index = index;
93 hwif->major = ide_hwif_to_major[index];
94
95 hwif->name[0] = 'i';
96 hwif->name[1] = 'd';
97 hwif->name[2] = 'e';
98 hwif->name[3] = '0' + index;
99
100 hwif->bus_state = BUSSTATE_ON;
101
102 init_completion(&hwif->gendev_rel_comp);
103
104 hwif->tp_ops = &default_tp_ops;
105
106 ide_port_init_devices_data(hwif);
107 }
108
109 static void ide_port_init_devices_data(ide_hwif_t *hwif)
110 {
111 int unit;
112
113 for (unit = 0; unit < MAX_DRIVES; ++unit) {
114 ide_drive_t *drive = &hwif->drives[unit];
115 u8 j = (hwif->index * MAX_DRIVES) + unit;
116
117 memset(drive, 0, sizeof(*drive));
118
119 drive->media = ide_disk;
120 drive->select.all = (unit<<4)|0xa0;
121 drive->hwif = hwif;
122 drive->ready_stat = READY_STAT;
123 drive->bad_wstat = BAD_W_STAT;
124 drive->special.b.recalibrate = 1;
125 drive->special.b.set_geometry = 1;
126 drive->name[0] = 'h';
127 drive->name[1] = 'd';
128 drive->name[2] = 'a' + j;
129 drive->max_failures = IDE_DEFAULT_MAX_FAILURES;
130
131 INIT_LIST_HEAD(&drive->list);
132 init_completion(&drive->gendev_rel_comp);
133 }
134 }
135
136 /* Called with ide_lock held. */
137 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
138 {
139 int i;
140
141 for (i = 0; i < MAX_DRIVES; i++) {
142 ide_drive_t *drive = &hwif->drives[i];
143
144 if (drive->present) {
145 spin_unlock_irq(&ide_lock);
146 device_unregister(&drive->gendev);
147 wait_for_completion(&drive->gendev_rel_comp);
148 spin_lock_irq(&ide_lock);
149 }
150 }
151 }
152
153 void ide_port_unregister_devices(ide_hwif_t *hwif)
154 {
155 mutex_lock(&ide_cfg_mtx);
156 spin_lock_irq(&ide_lock);
157 __ide_port_unregister_devices(hwif);
158 hwif->present = 0;
159 ide_port_init_devices_data(hwif);
160 spin_unlock_irq(&ide_lock);
161 mutex_unlock(&ide_cfg_mtx);
162 }
163 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
164
165 /**
166 * ide_unregister - free an IDE interface
167 * @hwif: IDE interface
168 *
169 * Perform the final unregister of an IDE interface. At the moment
170 * we don't refcount interfaces so this will also get split up.
171 *
172 * Locking:
173 * The caller must not hold the IDE locks
174 * The drive present/vanishing is not yet properly locked
175 * Take care with the callbacks. These have been split to avoid
176 * deadlocking the IDE layer. The shutdown callback is called
177 * before we take the lock and free resources. It is up to the
178 * caller to be sure there is no pending I/O here, and that
179 * the interface will not be reopened (present/vanishing locking
180 * isn't yet done BTW). After we commit to the final kill we
181 * call the cleanup callback with the ide locks held.
182 *
183 * Unregister restores the hwif structures to the default state.
184 * This is raving bonkers.
185 */
186
187 void ide_unregister(ide_hwif_t *hwif)
188 {
189 ide_hwif_t *g;
190 ide_hwgroup_t *hwgroup;
191 int irq_count = 0;
192
193 BUG_ON(in_interrupt());
194 BUG_ON(irqs_disabled());
195
196 mutex_lock(&ide_cfg_mtx);
197
198 spin_lock_irq(&ide_lock);
199 if (hwif->present) {
200 __ide_port_unregister_devices(hwif);
201 hwif->present = 0;
202 }
203 spin_unlock_irq(&ide_lock);
204
205 ide_proc_unregister_port(hwif);
206
207 hwgroup = hwif->hwgroup;
208 /*
209 * free the irq if we were the only hwif using it
210 */
211 g = hwgroup->hwif;
212 do {
213 if (g->irq == hwif->irq)
214 ++irq_count;
215 g = g->next;
216 } while (g != hwgroup->hwif);
217 if (irq_count == 1)
218 free_irq(hwif->irq, hwgroup);
219
220 ide_remove_port_from_hwgroup(hwif);
221
222 device_unregister(hwif->portdev);
223 device_unregister(&hwif->gendev);
224 wait_for_completion(&hwif->gendev_rel_comp);
225
226 /*
227 * Remove us from the kernel's knowledge
228 */
229 blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
230 kfree(hwif->sg_table);
231 unregister_blkdev(hwif->major, hwif->name);
232
233 if (hwif->dma_base)
234 ide_release_dma_engine(hwif);
235
236 mutex_unlock(&ide_cfg_mtx);
237 }
238
239 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
240 {
241 memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
242 hwif->irq = hw->irq;
243 hwif->chipset = hw->chipset;
244 hwif->dev = hw->dev;
245 hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
246 hwif->ack_intr = hw->ack_intr;
247 hwif->config_data = hw->config;
248 }
249
250 /*
251 * Locks for IDE setting functionality
252 */
253
254 DEFINE_MUTEX(ide_setting_mtx);
255
256 EXPORT_SYMBOL_GPL(ide_setting_mtx);
257
258 /**
259 * ide_spin_wait_hwgroup - wait for group
260 * @drive: drive in the group
261 *
262 * Wait for an IDE device group to go non busy and then return
263 * holding the ide_lock which guards the hwgroup->busy status
264 * and right to use it.
265 */
266
267 int ide_spin_wait_hwgroup (ide_drive_t *drive)
268 {
269 ide_hwgroup_t *hwgroup = HWGROUP(drive);
270 unsigned long timeout = jiffies + (3 * HZ);
271
272 spin_lock_irq(&ide_lock);
273
274 while (hwgroup->busy) {
275 unsigned long lflags;
276 spin_unlock_irq(&ide_lock);
277 local_irq_set(lflags);
278 if (time_after(jiffies, timeout)) {
279 local_irq_restore(lflags);
280 printk(KERN_ERR "%s: channel busy\n", drive->name);
281 return -EBUSY;
282 }
283 local_irq_restore(lflags);
284 spin_lock_irq(&ide_lock);
285 }
286 return 0;
287 }
288
289 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
290
291 int set_io_32bit(ide_drive_t *drive, int arg)
292 {
293 if (drive->no_io_32bit)
294 return -EPERM;
295
296 if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
297 return -EINVAL;
298
299 if (ide_spin_wait_hwgroup(drive))
300 return -EBUSY;
301
302 drive->io_32bit = arg;
303
304 spin_unlock_irq(&ide_lock);
305
306 return 0;
307 }
308
309 static int set_ksettings(ide_drive_t *drive, int arg)
310 {
311 if (arg < 0 || arg > 1)
312 return -EINVAL;
313
314 if (ide_spin_wait_hwgroup(drive))
315 return -EBUSY;
316 drive->keep_settings = arg;
317 spin_unlock_irq(&ide_lock);
318
319 return 0;
320 }
321
322 int set_using_dma(ide_drive_t *drive, int arg)
323 {
324 #ifdef CONFIG_BLK_DEV_IDEDMA
325 ide_hwif_t *hwif = drive->hwif;
326 int err = -EPERM;
327
328 if (arg < 0 || arg > 1)
329 return -EINVAL;
330
331 if (!drive->id || !(drive->id->capability & 1))
332 goto out;
333
334 if (hwif->dma_ops == NULL)
335 goto out;
336
337 err = -EBUSY;
338 if (ide_spin_wait_hwgroup(drive))
339 goto out;
340 /*
341 * set ->busy flag, unlock and let it ride
342 */
343 hwif->hwgroup->busy = 1;
344 spin_unlock_irq(&ide_lock);
345
346 err = 0;
347
348 if (arg) {
349 if (ide_set_dma(drive))
350 err = -EIO;
351 } else
352 ide_dma_off(drive);
353
354 /*
355 * lock, clear ->busy flag and unlock before leaving
356 */
357 spin_lock_irq(&ide_lock);
358 hwif->hwgroup->busy = 0;
359 spin_unlock_irq(&ide_lock);
360 out:
361 return err;
362 #else
363 if (arg < 0 || arg > 1)
364 return -EINVAL;
365
366 return -EPERM;
367 #endif
368 }
369
370 int set_pio_mode(ide_drive_t *drive, int arg)
371 {
372 struct request *rq;
373 ide_hwif_t *hwif = drive->hwif;
374 const struct ide_port_ops *port_ops = hwif->port_ops;
375
376 if (arg < 0 || arg > 255)
377 return -EINVAL;
378
379 if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
380 (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
381 return -ENOSYS;
382
383 if (drive->special.b.set_tune)
384 return -EBUSY;
385
386 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
387 rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
388
389 drive->tune_req = (u8) arg;
390 drive->special.b.set_tune = 1;
391
392 blk_execute_rq(drive->queue, NULL, rq, 0);
393 blk_put_request(rq);
394
395 return 0;
396 }
397
398 static int set_unmaskirq(ide_drive_t *drive, int arg)
399 {
400 if (drive->no_unmask)
401 return -EPERM;
402
403 if (arg < 0 || arg > 1)
404 return -EINVAL;
405
406 if (ide_spin_wait_hwgroup(drive))
407 return -EBUSY;
408 drive->unmask = arg;
409 spin_unlock_irq(&ide_lock);
410
411 return 0;
412 }
413
414 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
415 {
416 ide_drive_t *drive = dev->driver_data;
417 ide_hwif_t *hwif = HWIF(drive);
418 struct request *rq;
419 struct request_pm_state rqpm;
420 ide_task_t args;
421 int ret;
422
423 /* Call ACPI _GTM only once */
424 if (!(drive->dn % 2))
425 ide_acpi_get_timing(hwif);
426
427 memset(&rqpm, 0, sizeof(rqpm));
428 memset(&args, 0, sizeof(args));
429 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
430 rq->cmd_type = REQ_TYPE_PM_SUSPEND;
431 rq->special = &args;
432 rq->data = &rqpm;
433 rqpm.pm_step = ide_pm_state_start_suspend;
434 if (mesg.event == PM_EVENT_PRETHAW)
435 mesg.event = PM_EVENT_FREEZE;
436 rqpm.pm_state = mesg.event;
437
438 ret = blk_execute_rq(drive->queue, NULL, rq, 0);
439 blk_put_request(rq);
440 /* only call ACPI _PS3 after both drivers are suspended */
441 if (!ret && (((drive->dn % 2) && hwif->drives[0].present
442 && hwif->drives[1].present)
443 || !hwif->drives[0].present
444 || !hwif->drives[1].present))
445 ide_acpi_set_state(hwif, 0);
446 return ret;
447 }
448
449 static int generic_ide_resume(struct device *dev)
450 {
451 ide_drive_t *drive = dev->driver_data;
452 ide_hwif_t *hwif = HWIF(drive);
453 struct request *rq;
454 struct request_pm_state rqpm;
455 ide_task_t args;
456 int err;
457
458 /* Call ACPI _STM only once */
459 if (!(drive->dn % 2)) {
460 ide_acpi_set_state(hwif, 1);
461 ide_acpi_push_timing(hwif);
462 }
463
464 ide_acpi_exec_tfs(drive);
465
466 memset(&rqpm, 0, sizeof(rqpm));
467 memset(&args, 0, sizeof(args));
468 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
469 rq->cmd_type = REQ_TYPE_PM_RESUME;
470 rq->cmd_flags |= REQ_PREEMPT;
471 rq->special = &args;
472 rq->data = &rqpm;
473 rqpm.pm_step = ide_pm_state_start_resume;
474 rqpm.pm_state = PM_EVENT_ON;
475
476 err = blk_execute_rq(drive->queue, NULL, rq, 1);
477 blk_put_request(rq);
478
479 if (err == 0 && dev->driver) {
480 ide_driver_t *drv = to_ide_driver(dev->driver);
481
482 if (drv->resume)
483 drv->resume(drive);
484 }
485
486 return err;
487 }
488
489 static int generic_drive_reset(ide_drive_t *drive)
490 {
491 struct request *rq;
492 int ret = 0;
493
494 rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
495 rq->cmd_type = REQ_TYPE_SPECIAL;
496 rq->cmd_len = 1;
497 rq->cmd[0] = REQ_DRIVE_RESET;
498 rq->cmd_flags |= REQ_SOFTBARRIER;
499 if (blk_execute_rq(drive->queue, NULL, rq, 1))
500 ret = rq->errors;
501 blk_put_request(rq);
502 return ret;
503 }
504
505 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
506 unsigned int cmd, unsigned long arg)
507 {
508 unsigned long flags;
509 ide_driver_t *drv;
510 void __user *p = (void __user *)arg;
511 int err = 0, (*setfunc)(ide_drive_t *, int);
512 u8 *val;
513
514 switch (cmd) {
515 case HDIO_GET_32BIT: val = &drive->io_32bit; goto read_val;
516 case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
517 case HDIO_GET_UNMASKINTR: val = &drive->unmask; goto read_val;
518 case HDIO_GET_DMA: val = &drive->using_dma; goto read_val;
519 case HDIO_SET_32BIT: setfunc = set_io_32bit; goto set_val;
520 case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings; goto set_val;
521 case HDIO_SET_PIO_MODE: setfunc = set_pio_mode; goto set_val;
522 case HDIO_SET_UNMASKINTR: setfunc = set_unmaskirq; goto set_val;
523 case HDIO_SET_DMA: setfunc = set_using_dma; goto set_val;
524 }
525
526 switch (cmd) {
527 case HDIO_OBSOLETE_IDENTITY:
528 case HDIO_GET_IDENTITY:
529 if (bdev != bdev->bd_contains)
530 return -EINVAL;
531 if (drive->id_read == 0)
532 return -ENOMSG;
533 if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
534 return -EFAULT;
535 return 0;
536
537 case HDIO_GET_NICE:
538 return put_user(drive->dsc_overlap << IDE_NICE_DSC_OVERLAP |
539 drive->atapi_overlap << IDE_NICE_ATAPI_OVERLAP |
540 drive->nice1 << IDE_NICE_1,
541 (long __user *) arg);
542 #ifdef CONFIG_IDE_TASK_IOCTL
543 case HDIO_DRIVE_TASKFILE:
544 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
545 return -EACCES;
546 switch(drive->media) {
547 case ide_disk:
548 return ide_taskfile_ioctl(drive, cmd, arg);
549 default:
550 return -ENOMSG;
551 }
552 #endif /* CONFIG_IDE_TASK_IOCTL */
553
554 case HDIO_DRIVE_CMD:
555 if (!capable(CAP_SYS_RAWIO))
556 return -EACCES;
557 return ide_cmd_ioctl(drive, cmd, arg);
558
559 case HDIO_DRIVE_TASK:
560 if (!capable(CAP_SYS_RAWIO))
561 return -EACCES;
562 return ide_task_ioctl(drive, cmd, arg);
563 case HDIO_SET_NICE:
564 if (!capable(CAP_SYS_ADMIN)) return -EACCES;
565 if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
566 return -EPERM;
567 drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
568 drv = *(ide_driver_t **)bdev->bd_disk->private_data;
569 if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
570 drive->dsc_overlap = 0;
571 return -EPERM;
572 }
573 drive->nice1 = (arg >> IDE_NICE_1) & 1;
574 return 0;
575 case HDIO_DRIVE_RESET:
576 if (!capable(CAP_SYS_ADMIN))
577 return -EACCES;
578
579 return generic_drive_reset(drive);
580
581 case HDIO_GET_BUSSTATE:
582 if (!capable(CAP_SYS_ADMIN))
583 return -EACCES;
584 if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
585 return -EFAULT;
586 return 0;
587
588 case HDIO_SET_BUSSTATE:
589 if (!capable(CAP_SYS_ADMIN))
590 return -EACCES;
591 return -EOPNOTSUPP;
592 default:
593 return -EINVAL;
594 }
595
596 read_val:
597 mutex_lock(&ide_setting_mtx);
598 spin_lock_irqsave(&ide_lock, flags);
599 err = *val;
600 spin_unlock_irqrestore(&ide_lock, flags);
601 mutex_unlock(&ide_setting_mtx);
602 return err >= 0 ? put_user(err, (long __user *)arg) : err;
603
604 set_val:
605 if (bdev != bdev->bd_contains)
606 err = -EINVAL;
607 else {
608 if (!capable(CAP_SYS_ADMIN))
609 err = -EACCES;
610 else {
611 mutex_lock(&ide_setting_mtx);
612 err = setfunc(drive, arg);
613 mutex_unlock(&ide_setting_mtx);
614 }
615 }
616 return err;
617 }
618
619 EXPORT_SYMBOL(generic_ide_ioctl);
620
621 /**
622 * ide_device_get - get an additional reference to a ide_drive_t
623 * @drive: device to get a reference to
624 *
625 * Gets a reference to the ide_drive_t and increments the use count of the
626 * underlying LLDD module.
627 */
628 int ide_device_get(ide_drive_t *drive)
629 {
630 struct device *host_dev;
631 struct module *module;
632
633 if (!get_device(&drive->gendev))
634 return -ENXIO;
635
636 host_dev = drive->hwif->host->dev[0];
637 module = host_dev ? host_dev->driver->owner : NULL;
638
639 if (module && !try_module_get(module)) {
640 put_device(&drive->gendev);
641 return -ENXIO;
642 }
643
644 return 0;
645 }
646 EXPORT_SYMBOL_GPL(ide_device_get);
647
648 /**
649 * ide_device_put - release a reference to a ide_drive_t
650 * @drive: device to release a reference on
651 *
652 * Release a reference to the ide_drive_t and decrements the use count of
653 * the underlying LLDD module.
654 */
655 void ide_device_put(ide_drive_t *drive)
656 {
657 #ifdef CONFIG_MODULE_UNLOAD
658 struct device *host_dev = drive->hwif->host->dev[0];
659 struct module *module = host_dev ? host_dev->driver->owner : NULL;
660
661 if (module)
662 module_put(module);
663 #endif
664 put_device(&drive->gendev);
665 }
666 EXPORT_SYMBOL_GPL(ide_device_put);
667
668 static int ide_bus_match(struct device *dev, struct device_driver *drv)
669 {
670 return 1;
671 }
672
673 static char *media_string(ide_drive_t *drive)
674 {
675 switch (drive->media) {
676 case ide_disk:
677 return "disk";
678 case ide_cdrom:
679 return "cdrom";
680 case ide_tape:
681 return "tape";
682 case ide_floppy:
683 return "floppy";
684 case ide_optical:
685 return "optical";
686 default:
687 return "UNKNOWN";
688 }
689 }
690
691 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
692 {
693 ide_drive_t *drive = to_ide_device(dev);
694 return sprintf(buf, "%s\n", media_string(drive));
695 }
696
697 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
698 {
699 ide_drive_t *drive = to_ide_device(dev);
700 return sprintf(buf, "%s\n", drive->name);
701 }
702
703 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
704 {
705 ide_drive_t *drive = to_ide_device(dev);
706 return sprintf(buf, "ide:m-%s\n", media_string(drive));
707 }
708
709 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
710 char *buf)
711 {
712 ide_drive_t *drive = to_ide_device(dev);
713 return sprintf(buf, "%s\n", drive->id->model);
714 }
715
716 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
717 char *buf)
718 {
719 ide_drive_t *drive = to_ide_device(dev);
720 return sprintf(buf, "%s\n", drive->id->fw_rev);
721 }
722
723 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
724 char *buf)
725 {
726 ide_drive_t *drive = to_ide_device(dev);
727 return sprintf(buf, "%s\n", drive->id->serial_no);
728 }
729
730 static struct device_attribute ide_dev_attrs[] = {
731 __ATTR_RO(media),
732 __ATTR_RO(drivename),
733 __ATTR_RO(modalias),
734 __ATTR_RO(model),
735 __ATTR_RO(firmware),
736 __ATTR(serial, 0400, serial_show, NULL),
737 __ATTR_NULL
738 };
739
740 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
741 {
742 ide_drive_t *drive = to_ide_device(dev);
743
744 add_uevent_var(env, "MEDIA=%s", media_string(drive));
745 add_uevent_var(env, "DRIVENAME=%s", drive->name);
746 add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
747 return 0;
748 }
749
750 static int generic_ide_probe(struct device *dev)
751 {
752 ide_drive_t *drive = to_ide_device(dev);
753 ide_driver_t *drv = to_ide_driver(dev->driver);
754
755 return drv->probe ? drv->probe(drive) : -ENODEV;
756 }
757
758 static int generic_ide_remove(struct device *dev)
759 {
760 ide_drive_t *drive = to_ide_device(dev);
761 ide_driver_t *drv = to_ide_driver(dev->driver);
762
763 if (drv->remove)
764 drv->remove(drive);
765
766 return 0;
767 }
768
769 static void generic_ide_shutdown(struct device *dev)
770 {
771 ide_drive_t *drive = to_ide_device(dev);
772 ide_driver_t *drv = to_ide_driver(dev->driver);
773
774 if (dev->driver && drv->shutdown)
775 drv->shutdown(drive);
776 }
777
778 struct bus_type ide_bus_type = {
779 .name = "ide",
780 .match = ide_bus_match,
781 .uevent = ide_uevent,
782 .probe = generic_ide_probe,
783 .remove = generic_ide_remove,
784 .shutdown = generic_ide_shutdown,
785 .dev_attrs = ide_dev_attrs,
786 .suspend = generic_ide_suspend,
787 .resume = generic_ide_resume,
788 };
789
790 EXPORT_SYMBOL_GPL(ide_bus_type);
791
792 int ide_vlb_clk;
793 EXPORT_SYMBOL_GPL(ide_vlb_clk);
794
795 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
796 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
797
798 int ide_pci_clk;
799 EXPORT_SYMBOL_GPL(ide_pci_clk);
800
801 module_param_named(pci_clock, ide_pci_clk, int, 0);
802 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
803
804 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
805 {
806 int a, b, i, j = 1;
807 unsigned int *dev_param_mask = (unsigned int *)kp->arg;
808
809 if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
810 sscanf(s, "%d.%d", &a, &b) != 2)
811 return -EINVAL;
812
813 i = a * MAX_DRIVES + b;
814
815 if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
816 return -EINVAL;
817
818 if (j)
819 *dev_param_mask |= (1 << i);
820 else
821 *dev_param_mask &= (1 << i);
822
823 return 0;
824 }
825
826 static unsigned int ide_nodma;
827
828 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
829 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
830
831 static unsigned int ide_noflush;
832
833 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
834 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
835
836 static unsigned int ide_noprobe;
837
838 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
839 MODULE_PARM_DESC(noprobe, "skip probing for a device");
840
841 static unsigned int ide_nowerr;
842
843 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
844 MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device");
845
846 static unsigned int ide_cdroms;
847
848 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
849 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
850
851 struct chs_geom {
852 unsigned int cyl;
853 u8 head;
854 u8 sect;
855 };
856
857 static unsigned int ide_disks;
858 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
859
860 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
861 {
862 int a, b, c = 0, h = 0, s = 0, i, j = 1;
863
864 if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
865 sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
866 return -EINVAL;
867
868 i = a * MAX_DRIVES + b;
869
870 if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
871 return -EINVAL;
872
873 if (c > INT_MAX || h > 255 || s > 255)
874 return -EINVAL;
875
876 if (j)
877 ide_disks |= (1 << i);
878 else
879 ide_disks &= (1 << i);
880
881 ide_disks_chs[i].cyl = c;
882 ide_disks_chs[i].head = h;
883 ide_disks_chs[i].sect = s;
884
885 return 0;
886 }
887
888 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
889 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
890
891 static void ide_dev_apply_params(ide_drive_t *drive)
892 {
893 int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
894
895 if (ide_nodma & (1 << i)) {
896 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
897 drive->nodma = 1;
898 }
899 if (ide_noflush & (1 << i)) {
900 printk(KERN_INFO "ide: disabling flush requests for %s\n",
901 drive->name);
902 drive->noflush = 1;
903 }
904 if (ide_noprobe & (1 << i)) {
905 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
906 drive->noprobe = 1;
907 }
908 if (ide_nowerr & (1 << i)) {
909 printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n",
910 drive->name);
911 drive->bad_wstat = BAD_R_STAT;
912 }
913 if (ide_cdroms & (1 << i)) {
914 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
915 drive->present = 1;
916 drive->media = ide_cdrom;
917 /* an ATAPI device ignores DRDY */
918 drive->ready_stat = 0;
919 }
920 if (ide_disks & (1 << i)) {
921 drive->cyl = drive->bios_cyl = ide_disks_chs[i].cyl;
922 drive->head = drive->bios_head = ide_disks_chs[i].head;
923 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
924 drive->forced_geom = 1;
925 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
926 drive->name,
927 drive->cyl, drive->head, drive->sect);
928 drive->present = 1;
929 drive->media = ide_disk;
930 drive->ready_stat = READY_STAT;
931 }
932 }
933
934 static unsigned int ide_ignore_cable;
935
936 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
937 {
938 int i, j = 1;
939
940 if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
941 return -EINVAL;
942
943 if (i >= MAX_HWIFS || j < 0 || j > 1)
944 return -EINVAL;
945
946 if (j)
947 ide_ignore_cable |= (1 << i);
948 else
949 ide_ignore_cable &= (1 << i);
950
951 return 0;
952 }
953
954 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
955 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
956
957 void ide_port_apply_params(ide_hwif_t *hwif)
958 {
959 int i;
960
961 if (ide_ignore_cable & (1 << hwif->index)) {
962 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
963 hwif->name);
964 hwif->cbl = ATA_CBL_PATA40_SHORT;
965 }
966
967 for (i = 0; i < MAX_DRIVES; i++)
968 ide_dev_apply_params(&hwif->drives[i]);
969 }
970
971 /*
972 * This is gets invoked once during initialization, to set *everything* up
973 */
974 static int __init ide_init(void)
975 {
976 int ret;
977
978 printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
979
980 ret = bus_register(&ide_bus_type);
981 if (ret < 0) {
982 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
983 return ret;
984 }
985
986 ide_port_class = class_create(THIS_MODULE, "ide_port");
987 if (IS_ERR(ide_port_class)) {
988 ret = PTR_ERR(ide_port_class);
989 goto out_port_class;
990 }
991
992 proc_ide_create();
993
994 return 0;
995
996 out_port_class:
997 bus_unregister(&ide_bus_type);
998
999 return ret;
1000 }
1001
1002 static void __exit ide_exit(void)
1003 {
1004 proc_ide_destroy();
1005
1006 class_destroy(ide_port_class);
1007
1008 bus_unregister(&ide_bus_type);
1009 }
1010
1011 module_init(ide_init);
1012 module_exit(ide_exit);
1013
1014 MODULE_LICENSE("GPL");
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