ide: include <linux/hdreg.h> only when needed
[linux-3.10.git] / drivers / ide / ide.c
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 #include <linux/module.h>
48 #include <linux/types.h>
49 #include <linux/string.h>
50 #include <linux/kernel.h>
51 #include <linux/interrupt.h>
52 #include <linux/major.h>
53 #include <linux/errno.h>
54 #include <linux/genhd.h>
55 #include <linux/slab.h>
56 #include <linux/init.h>
57 #include <linux/pci.h>
58 #include <linux/ide.h>
59 #include <linux/hdreg.h>
60 #include <linux/completion.h>
61 #include <linux/device.h>
62
63
64 /* default maximum number of failures */
65 #define IDE_DEFAULT_MAX_FAILURES        1
66
67 struct class *ide_port_class;
68
69 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
70                                         IDE2_MAJOR, IDE3_MAJOR,
71                                         IDE4_MAJOR, IDE5_MAJOR,
72                                         IDE6_MAJOR, IDE7_MAJOR,
73                                         IDE8_MAJOR, IDE9_MAJOR };
74
75 DEFINE_MUTEX(ide_cfg_mtx);
76
77 __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
78 EXPORT_SYMBOL(ide_lock);
79
80 static void ide_port_init_devices_data(ide_hwif_t *);
81
82 /*
83  * Do not even *think* about calling this!
84  */
85 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
86 {
87         /* bulk initialize hwif & drive info with zeros */
88         memset(hwif, 0, sizeof(ide_hwif_t));
89
90         /* fill in any non-zero initial values */
91         hwif->index     = index;
92         hwif->major     = ide_hwif_to_major[index];
93
94         hwif->name[0]   = 'i';
95         hwif->name[1]   = 'd';
96         hwif->name[2]   = 'e';
97         hwif->name[3]   = '0' + index;
98
99         hwif->bus_state = BUSSTATE_ON;
100
101         init_completion(&hwif->gendev_rel_comp);
102
103         hwif->tp_ops = &default_tp_ops;
104
105         ide_port_init_devices_data(hwif);
106 }
107
108 static void ide_port_init_devices_data(ide_hwif_t *hwif)
109 {
110         int unit;
111
112         for (unit = 0; unit < MAX_DRIVES; ++unit) {
113                 ide_drive_t *drive = &hwif->drives[unit];
114                 u8 j = (hwif->index * MAX_DRIVES) + unit;
115
116                 memset(drive, 0, sizeof(*drive));
117
118                 drive->media                    = ide_disk;
119                 drive->select.all               = (unit<<4)|0xa0;
120                 drive->hwif                     = hwif;
121                 drive->ready_stat               = ATA_DRDY;
122                 drive->bad_wstat                = BAD_W_STAT;
123                 drive->special.b.recalibrate    = 1;
124                 drive->special.b.set_geometry   = 1;
125                 drive->name[0]                  = 'h';
126                 drive->name[1]                  = 'd';
127                 drive->name[2]                  = 'a' + j;
128                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
129
130                 INIT_LIST_HEAD(&drive->list);
131                 init_completion(&drive->gendev_rel_comp);
132         }
133 }
134
135 /* Called with ide_lock held. */
136 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
137 {
138         int i;
139
140         for (i = 0; i < MAX_DRIVES; i++) {
141                 ide_drive_t *drive = &hwif->drives[i];
142
143                 if (drive->present) {
144                         spin_unlock_irq(&ide_lock);
145                         device_unregister(&drive->gendev);
146                         wait_for_completion(&drive->gendev_rel_comp);
147                         spin_lock_irq(&ide_lock);
148                 }
149         }
150 }
151
152 void ide_port_unregister_devices(ide_hwif_t *hwif)
153 {
154         mutex_lock(&ide_cfg_mtx);
155         spin_lock_irq(&ide_lock);
156         __ide_port_unregister_devices(hwif);
157         hwif->present = 0;
158         ide_port_init_devices_data(hwif);
159         spin_unlock_irq(&ide_lock);
160         mutex_unlock(&ide_cfg_mtx);
161 }
162 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
163
164 /**
165  *      ide_unregister          -       free an IDE interface
166  *      @hwif: IDE interface
167  *
168  *      Perform the final unregister of an IDE interface. At the moment
169  *      we don't refcount interfaces so this will also get split up.
170  *
171  *      Locking:
172  *      The caller must not hold the IDE locks
173  *      The drive present/vanishing is not yet properly locked
174  *      Take care with the callbacks. These have been split to avoid
175  *      deadlocking the IDE layer. The shutdown callback is called
176  *      before we take the lock and free resources. It is up to the
177  *      caller to be sure there is no pending I/O here, and that
178  *      the interface will not be reopened (present/vanishing locking
179  *      isn't yet done BTW). After we commit to the final kill we
180  *      call the cleanup callback with the ide locks held.
181  *
182  *      Unregister restores the hwif structures to the default state.
183  *      This is raving bonkers.
184  */
185
186 void ide_unregister(ide_hwif_t *hwif)
187 {
188         ide_hwif_t *g;
189         ide_hwgroup_t *hwgroup;
190         int irq_count = 0;
191
192         BUG_ON(in_interrupt());
193         BUG_ON(irqs_disabled());
194
195         mutex_lock(&ide_cfg_mtx);
196
197         spin_lock_irq(&ide_lock);
198         if (hwif->present) {
199                 __ide_port_unregister_devices(hwif);
200                 hwif->present = 0;
201         }
202         spin_unlock_irq(&ide_lock);
203
204         ide_proc_unregister_port(hwif);
205
206         hwgroup = hwif->hwgroup;
207         /*
208          * free the irq if we were the only hwif using it
209          */
210         g = hwgroup->hwif;
211         do {
212                 if (g->irq == hwif->irq)
213                         ++irq_count;
214                 g = g->next;
215         } while (g != hwgroup->hwif);
216         if (irq_count == 1)
217                 free_irq(hwif->irq, hwgroup);
218
219         ide_remove_port_from_hwgroup(hwif);
220
221         device_unregister(hwif->portdev);
222         device_unregister(&hwif->gendev);
223         wait_for_completion(&hwif->gendev_rel_comp);
224
225         /*
226          * Remove us from the kernel's knowledge
227          */
228         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
229         kfree(hwif->sg_table);
230         unregister_blkdev(hwif->major, hwif->name);
231
232         if (hwif->dma_base)
233                 ide_release_dma_engine(hwif);
234
235         mutex_unlock(&ide_cfg_mtx);
236 }
237
238 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
239 {
240         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
241         hwif->irq = hw->irq;
242         hwif->chipset = hw->chipset;
243         hwif->dev = hw->dev;
244         hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
245         hwif->ack_intr = hw->ack_intr;
246         hwif->config_data = hw->config;
247 }
248
249 /*
250  *      Locks for IDE setting functionality
251  */
252
253 DEFINE_MUTEX(ide_setting_mtx);
254
255 EXPORT_SYMBOL_GPL(ide_setting_mtx);
256
257 /**
258  *      ide_spin_wait_hwgroup   -       wait for group
259  *      @drive: drive in the group
260  *
261  *      Wait for an IDE device group to go non busy and then return
262  *      holding the ide_lock which guards the hwgroup->busy status
263  *      and right to use it.
264  */
265
266 int ide_spin_wait_hwgroup (ide_drive_t *drive)
267 {
268         ide_hwgroup_t *hwgroup = HWGROUP(drive);
269         unsigned long timeout = jiffies + (3 * HZ);
270
271         spin_lock_irq(&ide_lock);
272
273         while (hwgroup->busy) {
274                 unsigned long lflags;
275                 spin_unlock_irq(&ide_lock);
276                 local_irq_set(lflags);
277                 if (time_after(jiffies, timeout)) {
278                         local_irq_restore(lflags);
279                         printk(KERN_ERR "%s: channel busy\n", drive->name);
280                         return -EBUSY;
281                 }
282                 local_irq_restore(lflags);
283                 spin_lock_irq(&ide_lock);
284         }
285         return 0;
286 }
287
288 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
289
290 int set_io_32bit(ide_drive_t *drive, int arg)
291 {
292         if (drive->no_io_32bit)
293                 return -EPERM;
294
295         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
296                 return -EINVAL;
297
298         if (ide_spin_wait_hwgroup(drive))
299                 return -EBUSY;
300
301         drive->io_32bit = arg;
302
303         spin_unlock_irq(&ide_lock);
304
305         return 0;
306 }
307
308 static int set_ksettings(ide_drive_t *drive, int arg)
309 {
310         if (arg < 0 || arg > 1)
311                 return -EINVAL;
312
313         if (ide_spin_wait_hwgroup(drive))
314                 return -EBUSY;
315         drive->keep_settings = arg;
316         spin_unlock_irq(&ide_lock);
317
318         return 0;
319 }
320
321 int set_using_dma(ide_drive_t *drive, int arg)
322 {
323 #ifdef CONFIG_BLK_DEV_IDEDMA
324         ide_hwif_t *hwif = drive->hwif;
325         int err = -EPERM;
326
327         if (arg < 0 || arg > 1)
328                 return -EINVAL;
329
330         if (ata_id_has_dma(drive->id) == 0)
331                 goto out;
332
333         if (hwif->dma_ops == NULL)
334                 goto out;
335
336         err = -EBUSY;
337         if (ide_spin_wait_hwgroup(drive))
338                 goto out;
339         /*
340          * set ->busy flag, unlock and let it ride
341          */
342         hwif->hwgroup->busy = 1;
343         spin_unlock_irq(&ide_lock);
344
345         err = 0;
346
347         if (arg) {
348                 if (ide_set_dma(drive))
349                         err = -EIO;
350         } else
351                 ide_dma_off(drive);
352
353         /*
354          * lock, clear ->busy flag and unlock before leaving
355          */
356         spin_lock_irq(&ide_lock);
357         hwif->hwgroup->busy = 0;
358         spin_unlock_irq(&ide_lock);
359 out:
360         return err;
361 #else
362         if (arg < 0 || arg > 1)
363                 return -EINVAL;
364
365         return -EPERM;
366 #endif
367 }
368
369 int set_pio_mode(ide_drive_t *drive, int arg)
370 {
371         struct request *rq;
372         ide_hwif_t *hwif = drive->hwif;
373         const struct ide_port_ops *port_ops = hwif->port_ops;
374
375         if (arg < 0 || arg > 255)
376                 return -EINVAL;
377
378         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
379             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
380                 return -ENOSYS;
381
382         if (drive->special.b.set_tune)
383                 return -EBUSY;
384
385         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
386         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
387
388         drive->tune_req = (u8) arg;
389         drive->special.b.set_tune = 1;
390
391         blk_execute_rq(drive->queue, NULL, rq, 0);
392         blk_put_request(rq);
393
394         return 0;
395 }
396
397 static int set_unmaskirq(ide_drive_t *drive, int arg)
398 {
399         if (drive->no_unmask)
400                 return -EPERM;
401
402         if (arg < 0 || arg > 1)
403                 return -EINVAL;
404
405         if (ide_spin_wait_hwgroup(drive))
406                 return -EBUSY;
407         drive->unmask = arg;
408         spin_unlock_irq(&ide_lock);
409
410         return 0;
411 }
412
413 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
414 {
415         ide_drive_t *drive = dev->driver_data;
416         ide_hwif_t *hwif = HWIF(drive);
417         struct request *rq;
418         struct request_pm_state rqpm;
419         ide_task_t args;
420         int ret;
421
422         /* Call ACPI _GTM only once */
423         if (!(drive->dn % 2))
424                 ide_acpi_get_timing(hwif);
425
426         memset(&rqpm, 0, sizeof(rqpm));
427         memset(&args, 0, sizeof(args));
428         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
429         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
430         rq->special = &args;
431         rq->data = &rqpm;
432         rqpm.pm_step = ide_pm_state_start_suspend;
433         if (mesg.event == PM_EVENT_PRETHAW)
434                 mesg.event = PM_EVENT_FREEZE;
435         rqpm.pm_state = mesg.event;
436
437         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
438         blk_put_request(rq);
439         /* only call ACPI _PS3 after both drivers are suspended */
440         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
441                  && hwif->drives[1].present)
442                  || !hwif->drives[0].present
443                  || !hwif->drives[1].present))
444                 ide_acpi_set_state(hwif, 0);
445         return ret;
446 }
447
448 static int generic_ide_resume(struct device *dev)
449 {
450         ide_drive_t *drive = dev->driver_data;
451         ide_hwif_t *hwif = HWIF(drive);
452         struct request *rq;
453         struct request_pm_state rqpm;
454         ide_task_t args;
455         int err;
456
457         /* Call ACPI _STM only once */
458         if (!(drive->dn % 2)) {
459                 ide_acpi_set_state(hwif, 1);
460                 ide_acpi_push_timing(hwif);
461         }
462
463         ide_acpi_exec_tfs(drive);
464
465         memset(&rqpm, 0, sizeof(rqpm));
466         memset(&args, 0, sizeof(args));
467         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
468         rq->cmd_type = REQ_TYPE_PM_RESUME;
469         rq->cmd_flags |= REQ_PREEMPT;
470         rq->special = &args;
471         rq->data = &rqpm;
472         rqpm.pm_step = ide_pm_state_start_resume;
473         rqpm.pm_state = PM_EVENT_ON;
474
475         err = blk_execute_rq(drive->queue, NULL, rq, 1);
476         blk_put_request(rq);
477
478         if (err == 0 && dev->driver) {
479                 ide_driver_t *drv = to_ide_driver(dev->driver);
480
481                 if (drv->resume)
482                         drv->resume(drive);
483         }
484
485         return err;
486 }
487
488 static int generic_drive_reset(ide_drive_t *drive)
489 {
490         struct request *rq;
491         int ret = 0;
492
493         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
494         rq->cmd_type = REQ_TYPE_SPECIAL;
495         rq->cmd_len = 1;
496         rq->cmd[0] = REQ_DRIVE_RESET;
497         rq->cmd_flags |= REQ_SOFTBARRIER;
498         if (blk_execute_rq(drive->queue, NULL, rq, 1))
499                 ret = rq->errors;
500         blk_put_request(rq);
501         return ret;
502 }
503
504 static inline void ide_id_to_hd_driveid(u16 *id)
505 {
506 #ifdef __BIG_ENDIAN
507         /* accessed in struct hd_driveid as 8-bit values */
508         id[ATA_ID_MAX_MULTSECT]  = __cpu_to_le16(id[ATA_ID_MAX_MULTSECT]);
509         id[ATA_ID_CAPABILITY]    = __cpu_to_le16(id[ATA_ID_CAPABILITY]);
510         id[ATA_ID_OLD_PIO_MODES] = __cpu_to_le16(id[ATA_ID_OLD_PIO_MODES]);
511         id[ATA_ID_OLD_DMA_MODES] = __cpu_to_le16(id[ATA_ID_OLD_DMA_MODES]);
512         id[ATA_ID_MULTSECT]      = __cpu_to_le16(id[ATA_ID_MULTSECT]);
513
514         /* as 32-bit values */
515         *(u32 *)&id[ATA_ID_LBA_CAPACITY] = ata_id_u32(id, ATA_ID_LBA_CAPACITY);
516         *(u32 *)&id[ATA_ID_SPG]          = ata_id_u32(id, ATA_ID_SPG);
517
518         /* as 64-bit value */
519         *(u64 *)&id[ATA_ID_LBA_CAPACITY_2] =
520                 ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
521 #endif
522 }
523
524 static int ide_get_identity_ioctl(ide_drive_t *drive, unsigned int cmd,
525                                   unsigned long arg)
526 {
527         u16 *id = NULL;
528         int size = (cmd == HDIO_GET_IDENTITY) ? (ATA_ID_WORDS * 2) : 142;
529         int rc = 0;
530
531         if (drive->id_read == 0) {
532                 rc = -ENOMSG;
533                 goto out;
534         }
535
536         id = kmalloc(size, GFP_KERNEL);
537         if (id == NULL) {
538                 rc = -ENOMEM;
539                 goto out;
540         }
541
542         memcpy(id, drive->id, size);
543         ide_id_to_hd_driveid(id);
544
545         if (copy_to_user((void __user *)arg, id, size))
546                 rc = -EFAULT;
547
548         kfree(id);
549 out:
550         return rc;
551 }
552
553 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
554                         unsigned int cmd, unsigned long arg)
555 {
556         unsigned long flags;
557         ide_driver_t *drv;
558         int err = 0, (*setfunc)(ide_drive_t *, int);
559         u8 *val;
560
561         switch (cmd) {
562         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
563         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
564         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
565         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
566         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
567         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
568         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
569         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
570         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
571         }
572
573         switch (cmd) {
574                 case HDIO_OBSOLETE_IDENTITY:
575                 case HDIO_GET_IDENTITY:
576                         if (bdev != bdev->bd_contains)
577                                 return -EINVAL;
578                         return ide_get_identity_ioctl(drive, cmd, arg);
579                 case HDIO_GET_NICE:
580                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
581                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
582                                         drive->nice1 << IDE_NICE_1,
583                                         (long __user *) arg);
584 #ifdef CONFIG_IDE_TASK_IOCTL
585                 case HDIO_DRIVE_TASKFILE:
586                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
587                                 return -EACCES;
588                         switch(drive->media) {
589                                 case ide_disk:
590                                         return ide_taskfile_ioctl(drive, cmd, arg);
591                                 default:
592                                         return -ENOMSG;
593                         }
594 #endif /* CONFIG_IDE_TASK_IOCTL */
595
596                 case HDIO_DRIVE_CMD:
597                         if (!capable(CAP_SYS_RAWIO))
598                                 return -EACCES;
599                         return ide_cmd_ioctl(drive, cmd, arg);
600
601                 case HDIO_DRIVE_TASK:
602                         if (!capable(CAP_SYS_RAWIO))
603                                 return -EACCES;
604                         return ide_task_ioctl(drive, cmd, arg);
605                 case HDIO_SET_NICE:
606                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
607                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
608                                 return -EPERM;
609                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
610                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
611                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
612                                 drive->dsc_overlap = 0;
613                                 return -EPERM;
614                         }
615                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
616                         return 0;
617                 case HDIO_DRIVE_RESET:
618                         if (!capable(CAP_SYS_ADMIN))
619                                 return -EACCES;
620
621                         return generic_drive_reset(drive);
622
623                 case HDIO_GET_BUSSTATE:
624                         if (!capable(CAP_SYS_ADMIN))
625                                 return -EACCES;
626                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
627                                 return -EFAULT;
628                         return 0;
629
630                 case HDIO_SET_BUSSTATE:
631                         if (!capable(CAP_SYS_ADMIN))
632                                 return -EACCES;
633                         return -EOPNOTSUPP;
634                 default:
635                         return -EINVAL;
636         }
637
638 read_val:
639         mutex_lock(&ide_setting_mtx);
640         spin_lock_irqsave(&ide_lock, flags);
641         err = *val;
642         spin_unlock_irqrestore(&ide_lock, flags);
643         mutex_unlock(&ide_setting_mtx);
644         return err >= 0 ? put_user(err, (long __user *)arg) : err;
645
646 set_val:
647         if (bdev != bdev->bd_contains)
648                 err = -EINVAL;
649         else {
650                 if (!capable(CAP_SYS_ADMIN))
651                         err = -EACCES;
652                 else {
653                         mutex_lock(&ide_setting_mtx);
654                         err = setfunc(drive, arg);
655                         mutex_unlock(&ide_setting_mtx);
656                 }
657         }
658         return err;
659 }
660
661 EXPORT_SYMBOL(generic_ide_ioctl);
662
663 /**
664  * ide_device_get       -       get an additional reference to a ide_drive_t
665  * @drive:      device to get a reference to
666  *
667  * Gets a reference to the ide_drive_t and increments the use count of the
668  * underlying LLDD module.
669  */
670 int ide_device_get(ide_drive_t *drive)
671 {
672         struct device *host_dev;
673         struct module *module;
674
675         if (!get_device(&drive->gendev))
676                 return -ENXIO;
677
678         host_dev = drive->hwif->host->dev[0];
679         module = host_dev ? host_dev->driver->owner : NULL;
680
681         if (module && !try_module_get(module)) {
682                 put_device(&drive->gendev);
683                 return -ENXIO;
684         }
685
686         return 0;
687 }
688 EXPORT_SYMBOL_GPL(ide_device_get);
689
690 /**
691  * ide_device_put       -       release a reference to a ide_drive_t
692  * @drive:      device to release a reference on
693  *
694  * Release a reference to the ide_drive_t and decrements the use count of
695  * the underlying LLDD module.
696  */
697 void ide_device_put(ide_drive_t *drive)
698 {
699 #ifdef CONFIG_MODULE_UNLOAD
700         struct device *host_dev = drive->hwif->host->dev[0];
701         struct module *module = host_dev ? host_dev->driver->owner : NULL;
702
703         if (module)
704                 module_put(module);
705 #endif
706         put_device(&drive->gendev);
707 }
708 EXPORT_SYMBOL_GPL(ide_device_put);
709
710 static int ide_bus_match(struct device *dev, struct device_driver *drv)
711 {
712         return 1;
713 }
714
715 static char *media_string(ide_drive_t *drive)
716 {
717         switch (drive->media) {
718         case ide_disk:
719                 return "disk";
720         case ide_cdrom:
721                 return "cdrom";
722         case ide_tape:
723                 return "tape";
724         case ide_floppy:
725                 return "floppy";
726         case ide_optical:
727                 return "optical";
728         default:
729                 return "UNKNOWN";
730         }
731 }
732
733 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
734 {
735         ide_drive_t *drive = to_ide_device(dev);
736         return sprintf(buf, "%s\n", media_string(drive));
737 }
738
739 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
740 {
741         ide_drive_t *drive = to_ide_device(dev);
742         return sprintf(buf, "%s\n", drive->name);
743 }
744
745 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
746 {
747         ide_drive_t *drive = to_ide_device(dev);
748         return sprintf(buf, "ide:m-%s\n", media_string(drive));
749 }
750
751 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
752                           char *buf)
753 {
754         ide_drive_t *drive = to_ide_device(dev);
755         return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_PROD]);
756 }
757
758 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
759                              char *buf)
760 {
761         ide_drive_t *drive = to_ide_device(dev);
762         return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_FW_REV]);
763 }
764
765 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
766                            char *buf)
767 {
768         ide_drive_t *drive = to_ide_device(dev);
769         return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_SERNO]);
770 }
771
772 static struct device_attribute ide_dev_attrs[] = {
773         __ATTR_RO(media),
774         __ATTR_RO(drivename),
775         __ATTR_RO(modalias),
776         __ATTR_RO(model),
777         __ATTR_RO(firmware),
778         __ATTR(serial, 0400, serial_show, NULL),
779         __ATTR_NULL
780 };
781
782 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
783 {
784         ide_drive_t *drive = to_ide_device(dev);
785
786         add_uevent_var(env, "MEDIA=%s", media_string(drive));
787         add_uevent_var(env, "DRIVENAME=%s", drive->name);
788         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
789         return 0;
790 }
791
792 static int generic_ide_probe(struct device *dev)
793 {
794         ide_drive_t *drive = to_ide_device(dev);
795         ide_driver_t *drv = to_ide_driver(dev->driver);
796
797         return drv->probe ? drv->probe(drive) : -ENODEV;
798 }
799
800 static int generic_ide_remove(struct device *dev)
801 {
802         ide_drive_t *drive = to_ide_device(dev);
803         ide_driver_t *drv = to_ide_driver(dev->driver);
804
805         if (drv->remove)
806                 drv->remove(drive);
807
808         return 0;
809 }
810
811 static void generic_ide_shutdown(struct device *dev)
812 {
813         ide_drive_t *drive = to_ide_device(dev);
814         ide_driver_t *drv = to_ide_driver(dev->driver);
815
816         if (dev->driver && drv->shutdown)
817                 drv->shutdown(drive);
818 }
819
820 struct bus_type ide_bus_type = {
821         .name           = "ide",
822         .match          = ide_bus_match,
823         .uevent         = ide_uevent,
824         .probe          = generic_ide_probe,
825         .remove         = generic_ide_remove,
826         .shutdown       = generic_ide_shutdown,
827         .dev_attrs      = ide_dev_attrs,
828         .suspend        = generic_ide_suspend,
829         .resume         = generic_ide_resume,
830 };
831
832 EXPORT_SYMBOL_GPL(ide_bus_type);
833
834 int ide_vlb_clk;
835 EXPORT_SYMBOL_GPL(ide_vlb_clk);
836
837 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
838 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
839
840 int ide_pci_clk;
841 EXPORT_SYMBOL_GPL(ide_pci_clk);
842
843 module_param_named(pci_clock, ide_pci_clk, int, 0);
844 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
845
846 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
847 {
848         int a, b, i, j = 1;
849         unsigned int *dev_param_mask = (unsigned int *)kp->arg;
850
851         if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
852             sscanf(s, "%d.%d", &a, &b) != 2)
853                 return -EINVAL;
854
855         i = a * MAX_DRIVES + b;
856
857         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
858                 return -EINVAL;
859
860         if (j)
861                 *dev_param_mask |= (1 << i);
862         else
863                 *dev_param_mask &= (1 << i);
864
865         return 0;
866 }
867
868 static unsigned int ide_nodma;
869
870 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
871 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
872
873 static unsigned int ide_noflush;
874
875 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
876 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
877
878 static unsigned int ide_noprobe;
879
880 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
881 MODULE_PARM_DESC(noprobe, "skip probing for a device");
882
883 static unsigned int ide_nowerr;
884
885 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
886 MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device");
887
888 static unsigned int ide_cdroms;
889
890 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
891 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
892
893 struct chs_geom {
894         unsigned int    cyl;
895         u8              head;
896         u8              sect;
897 };
898
899 static unsigned int ide_disks;
900 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
901
902 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
903 {
904         int a, b, c = 0, h = 0, s = 0, i, j = 1;
905
906         if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
907             sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
908                 return -EINVAL;
909
910         i = a * MAX_DRIVES + b;
911
912         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
913                 return -EINVAL;
914
915         if (c > INT_MAX || h > 255 || s > 255)
916                 return -EINVAL;
917
918         if (j)
919                 ide_disks |= (1 << i);
920         else
921                 ide_disks &= (1 << i);
922
923         ide_disks_chs[i].cyl  = c;
924         ide_disks_chs[i].head = h;
925         ide_disks_chs[i].sect = s;
926
927         return 0;
928 }
929
930 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
931 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
932
933 static void ide_dev_apply_params(ide_drive_t *drive)
934 {
935         int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
936
937         if (ide_nodma & (1 << i)) {
938                 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
939                 drive->nodma = 1;
940         }
941         if (ide_noflush & (1 << i)) {
942                 printk(KERN_INFO "ide: disabling flush requests for %s\n",
943                                  drive->name);
944                 drive->noflush = 1;
945         }
946         if (ide_noprobe & (1 << i)) {
947                 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
948                 drive->noprobe = 1;
949         }
950         if (ide_nowerr & (1 << i)) {
951                 printk(KERN_INFO "ide: ignoring the ATA_DF bit for %s\n",
952                                  drive->name);
953                 drive->bad_wstat = BAD_R_STAT;
954         }
955         if (ide_cdroms & (1 << i)) {
956                 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
957                 drive->present = 1;
958                 drive->media = ide_cdrom;
959                 /* an ATAPI device ignores DRDY */
960                 drive->ready_stat = 0;
961         }
962         if (ide_disks & (1 << i)) {
963                 drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
964                 drive->head = drive->bios_head = ide_disks_chs[i].head;
965                 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
966                 drive->forced_geom = 1;
967                 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
968                                  drive->name,
969                                  drive->cyl, drive->head, drive->sect);
970                 drive->present = 1;
971                 drive->media = ide_disk;
972                 drive->ready_stat = ATA_DRDY;
973         }
974 }
975
976 static unsigned int ide_ignore_cable;
977
978 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
979 {
980         int i, j = 1;
981
982         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
983                 return -EINVAL;
984
985         if (i >= MAX_HWIFS || j < 0 || j > 1)
986                 return -EINVAL;
987
988         if (j)
989                 ide_ignore_cable |= (1 << i);
990         else
991                 ide_ignore_cable &= (1 << i);
992
993         return 0;
994 }
995
996 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
997 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
998
999 void ide_port_apply_params(ide_hwif_t *hwif)
1000 {
1001         int i;
1002
1003         if (ide_ignore_cable & (1 << hwif->index)) {
1004                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
1005                                  hwif->name);
1006                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1007         }
1008
1009         for (i = 0; i < MAX_DRIVES; i++)
1010                 ide_dev_apply_params(&hwif->drives[i]);
1011 }
1012
1013 /*
1014  * This is gets invoked once during initialization, to set *everything* up
1015  */
1016 static int __init ide_init(void)
1017 {
1018         int ret;
1019
1020         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
1021
1022         ret = bus_register(&ide_bus_type);
1023         if (ret < 0) {
1024                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1025                 return ret;
1026         }
1027
1028         ide_port_class = class_create(THIS_MODULE, "ide_port");
1029         if (IS_ERR(ide_port_class)) {
1030                 ret = PTR_ERR(ide_port_class);
1031                 goto out_port_class;
1032         }
1033
1034         proc_ide_create();
1035
1036         return 0;
1037
1038 out_port_class:
1039         bus_unregister(&ide_bus_type);
1040
1041         return ret;
1042 }
1043
1044 static void __exit ide_exit(void)
1045 {
1046         proc_ide_destroy();
1047
1048         class_destroy(ide_port_class);
1049
1050         bus_unregister(&ide_bus_type);
1051 }
1052
1053 module_init(ide_init);
1054 module_exit(ide_exit);
1055
1056 MODULE_LICENSE("GPL");