ide: remove drive->ctl
[linux-3.10.git] / drivers / ide / ide.c
1 /*
2  *  Copyright (C) 1994-1998         Linus Torvalds & authors (see below)
3  *  Copyrifht (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/timer.h>
54 #include <linux/mm.h>
55 #include <linux/interrupt.h>
56 #include <linux/major.h>
57 #include <linux/errno.h>
58 #include <linux/genhd.h>
59 #include <linux/blkpg.h>
60 #include <linux/slab.h>
61 #include <linux/init.h>
62 #include <linux/pci.h>
63 #include <linux/delay.h>
64 #include <linux/ide.h>
65 #include <linux/completion.h>
66 #include <linux/reboot.h>
67 #include <linux/cdrom.h>
68 #include <linux/seq_file.h>
69 #include <linux/device.h>
70 #include <linux/bitops.h>
71
72 #include <asm/byteorder.h>
73 #include <asm/irq.h>
74 #include <asm/uaccess.h>
75 #include <asm/io.h>
76
77
78 /* default maximum number of failures */
79 #define IDE_DEFAULT_MAX_FAILURES        1
80
81 struct class *ide_port_class;
82
83 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
84                                         IDE2_MAJOR, IDE3_MAJOR,
85                                         IDE4_MAJOR, IDE5_MAJOR,
86                                         IDE6_MAJOR, IDE7_MAJOR,
87                                         IDE8_MAJOR, IDE9_MAJOR };
88
89 DEFINE_MUTEX(ide_cfg_mtx);
90
91 __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
92 EXPORT_SYMBOL(ide_lock);
93
94 ide_hwif_t ide_hwifs[MAX_HWIFS];        /* master data repository */
95
96 static void ide_port_init_devices_data(ide_hwif_t *);
97
98 /*
99  * Do not even *think* about calling this!
100  */
101 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
102 {
103         /* bulk initialize hwif & drive info with zeros */
104         memset(hwif, 0, sizeof(ide_hwif_t));
105
106         /* fill in any non-zero initial values */
107         hwif->index     = index;
108         hwif->major     = ide_hwif_to_major[index];
109
110         hwif->name[0]   = 'i';
111         hwif->name[1]   = 'd';
112         hwif->name[2]   = 'e';
113         hwif->name[3]   = '0' + index;
114
115         hwif->bus_state = BUSSTATE_ON;
116
117         init_completion(&hwif->gendev_rel_comp);
118
119         default_hwif_iops(hwif);
120         default_hwif_transport(hwif);
121
122         ide_port_init_devices_data(hwif);
123 }
124 EXPORT_SYMBOL_GPL(ide_init_port_data);
125
126 static void ide_port_init_devices_data(ide_hwif_t *hwif)
127 {
128         int unit;
129
130         for (unit = 0; unit < MAX_DRIVES; ++unit) {
131                 ide_drive_t *drive = &hwif->drives[unit];
132                 u8 j = (hwif->index * MAX_DRIVES) + unit;
133
134                 memset(drive, 0, sizeof(*drive));
135
136                 drive->media                    = ide_disk;
137                 drive->select.all               = (unit<<4)|0xa0;
138                 drive->hwif                     = hwif;
139                 drive->ready_stat               = READY_STAT;
140                 drive->bad_wstat                = BAD_W_STAT;
141                 drive->special.b.recalibrate    = 1;
142                 drive->special.b.set_geometry   = 1;
143                 drive->name[0]                  = 'h';
144                 drive->name[1]                  = 'd';
145                 drive->name[2]                  = 'a' + j;
146                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
147
148                 INIT_LIST_HEAD(&drive->list);
149                 init_completion(&drive->gendev_rel_comp);
150         }
151 }
152
153 static void __init init_ide_data (void)
154 {
155         unsigned int index;
156
157         /* Initialise all interface structures */
158         for (index = 0; index < MAX_HWIFS; ++index) {
159                 ide_hwif_t *hwif = &ide_hwifs[index];
160
161                 ide_init_port_data(hwif, index);
162         }
163 }
164
165 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
166 {
167         ide_hwgroup_t *hwgroup = hwif->hwgroup;
168
169         spin_lock_irq(&ide_lock);
170         /*
171          * Remove us from the hwgroup, and free
172          * the hwgroup if we were the only member
173          */
174         if (hwif->next == hwif) {
175                 BUG_ON(hwgroup->hwif != hwif);
176                 kfree(hwgroup);
177         } else {
178                 /* There is another interface in hwgroup.
179                  * Unlink us, and set hwgroup->drive and ->hwif to
180                  * something sane.
181                  */
182                 ide_hwif_t *g = hwgroup->hwif;
183
184                 while (g->next != hwif)
185                         g = g->next;
186                 g->next = hwif->next;
187                 if (hwgroup->hwif == hwif) {
188                         /* Chose a random hwif for hwgroup->hwif.
189                          * It's guaranteed that there are no drives
190                          * left in the hwgroup.
191                          */
192                         BUG_ON(hwgroup->drive != NULL);
193                         hwgroup->hwif = g;
194                 }
195                 BUG_ON(hwgroup->hwif == hwif);
196         }
197         spin_unlock_irq(&ide_lock);
198 }
199
200 /* Called with ide_lock held. */
201 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
202 {
203         int i;
204
205         for (i = 0; i < MAX_DRIVES; i++) {
206                 ide_drive_t *drive = &hwif->drives[i];
207
208                 if (drive->present) {
209                         spin_unlock_irq(&ide_lock);
210                         device_unregister(&drive->gendev);
211                         wait_for_completion(&drive->gendev_rel_comp);
212                         spin_lock_irq(&ide_lock);
213                 }
214         }
215 }
216
217 void ide_port_unregister_devices(ide_hwif_t *hwif)
218 {
219         mutex_lock(&ide_cfg_mtx);
220         spin_lock_irq(&ide_lock);
221         __ide_port_unregister_devices(hwif);
222         hwif->present = 0;
223         ide_port_init_devices_data(hwif);
224         spin_unlock_irq(&ide_lock);
225         mutex_unlock(&ide_cfg_mtx);
226 }
227 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
228
229 /**
230  *      ide_unregister          -       free an IDE interface
231  *      @hwif: IDE interface
232  *
233  *      Perform the final unregister of an IDE interface. At the moment
234  *      we don't refcount interfaces so this will also get split up.
235  *
236  *      Locking:
237  *      The caller must not hold the IDE locks
238  *      The drive present/vanishing is not yet properly locked
239  *      Take care with the callbacks. These have been split to avoid
240  *      deadlocking the IDE layer. The shutdown callback is called
241  *      before we take the lock and free resources. It is up to the
242  *      caller to be sure there is no pending I/O here, and that
243  *      the interface will not be reopened (present/vanishing locking
244  *      isn't yet done BTW). After we commit to the final kill we
245  *      call the cleanup callback with the ide locks held.
246  *
247  *      Unregister restores the hwif structures to the default state.
248  *      This is raving bonkers.
249  */
250
251 void ide_unregister(ide_hwif_t *hwif)
252 {
253         ide_hwif_t *g;
254         ide_hwgroup_t *hwgroup;
255         int irq_count = 0;
256
257         BUG_ON(in_interrupt());
258         BUG_ON(irqs_disabled());
259
260         mutex_lock(&ide_cfg_mtx);
261
262         spin_lock_irq(&ide_lock);
263         if (hwif->present) {
264                 __ide_port_unregister_devices(hwif);
265                 hwif->present = 0;
266         }
267         spin_unlock_irq(&ide_lock);
268
269         ide_proc_unregister_port(hwif);
270
271         hwgroup = hwif->hwgroup;
272         /*
273          * free the irq if we were the only hwif using it
274          */
275         g = hwgroup->hwif;
276         do {
277                 if (g->irq == hwif->irq)
278                         ++irq_count;
279                 g = g->next;
280         } while (g != hwgroup->hwif);
281         if (irq_count == 1)
282                 free_irq(hwif->irq, hwgroup);
283
284         ide_remove_port_from_hwgroup(hwif);
285
286         device_unregister(hwif->portdev);
287         device_unregister(&hwif->gendev);
288         wait_for_completion(&hwif->gendev_rel_comp);
289
290         /*
291          * Remove us from the kernel's knowledge
292          */
293         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
294         kfree(hwif->sg_table);
295         unregister_blkdev(hwif->major, hwif->name);
296
297         if (hwif->dma_base)
298                 ide_release_dma_engine(hwif);
299
300         spin_lock_irq(&ide_lock);
301         /* restore hwif data to pristine status */
302         ide_init_port_data(hwif, hwif->index);
303         spin_unlock_irq(&ide_lock);
304
305         mutex_unlock(&ide_cfg_mtx);
306 }
307
308 EXPORT_SYMBOL(ide_unregister);
309
310 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
311 {
312         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
313         hwif->irq = hw->irq;
314         hwif->chipset = hw->chipset;
315         hwif->gendev.parent = hw->dev;
316         hwif->ack_intr = hw->ack_intr;
317 }
318 EXPORT_SYMBOL_GPL(ide_init_port_hw);
319
320 /*
321  *      Locks for IDE setting functionality
322  */
323
324 DEFINE_MUTEX(ide_setting_mtx);
325
326 EXPORT_SYMBOL_GPL(ide_setting_mtx);
327
328 /**
329  *      ide_spin_wait_hwgroup   -       wait for group
330  *      @drive: drive in the group
331  *
332  *      Wait for an IDE device group to go non busy and then return
333  *      holding the ide_lock which guards the hwgroup->busy status
334  *      and right to use it.
335  */
336
337 int ide_spin_wait_hwgroup (ide_drive_t *drive)
338 {
339         ide_hwgroup_t *hwgroup = HWGROUP(drive);
340         unsigned long timeout = jiffies + (3 * HZ);
341
342         spin_lock_irq(&ide_lock);
343
344         while (hwgroup->busy) {
345                 unsigned long lflags;
346                 spin_unlock_irq(&ide_lock);
347                 local_irq_set(lflags);
348                 if (time_after(jiffies, timeout)) {
349                         local_irq_restore(lflags);
350                         printk(KERN_ERR "%s: channel busy\n", drive->name);
351                         return -EBUSY;
352                 }
353                 local_irq_restore(lflags);
354                 spin_lock_irq(&ide_lock);
355         }
356         return 0;
357 }
358
359 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
360
361 int set_io_32bit(ide_drive_t *drive, int arg)
362 {
363         if (drive->no_io_32bit)
364                 return -EPERM;
365
366         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
367                 return -EINVAL;
368
369         if (ide_spin_wait_hwgroup(drive))
370                 return -EBUSY;
371
372         drive->io_32bit = arg;
373
374         spin_unlock_irq(&ide_lock);
375
376         return 0;
377 }
378
379 static int set_ksettings(ide_drive_t *drive, int arg)
380 {
381         if (arg < 0 || arg > 1)
382                 return -EINVAL;
383
384         if (ide_spin_wait_hwgroup(drive))
385                 return -EBUSY;
386         drive->keep_settings = arg;
387         spin_unlock_irq(&ide_lock);
388
389         return 0;
390 }
391
392 int set_using_dma(ide_drive_t *drive, int arg)
393 {
394 #ifdef CONFIG_BLK_DEV_IDEDMA
395         ide_hwif_t *hwif = drive->hwif;
396         int err = -EPERM;
397
398         if (arg < 0 || arg > 1)
399                 return -EINVAL;
400
401         if (!drive->id || !(drive->id->capability & 1))
402                 goto out;
403
404         if (hwif->dma_ops == NULL)
405                 goto out;
406
407         err = -EBUSY;
408         if (ide_spin_wait_hwgroup(drive))
409                 goto out;
410         /*
411          * set ->busy flag, unlock and let it ride
412          */
413         hwif->hwgroup->busy = 1;
414         spin_unlock_irq(&ide_lock);
415
416         err = 0;
417
418         if (arg) {
419                 if (ide_set_dma(drive))
420                         err = -EIO;
421         } else
422                 ide_dma_off(drive);
423
424         /*
425          * lock, clear ->busy flag and unlock before leaving
426          */
427         spin_lock_irq(&ide_lock);
428         hwif->hwgroup->busy = 0;
429         spin_unlock_irq(&ide_lock);
430 out:
431         return err;
432 #else
433         if (arg < 0 || arg > 1)
434                 return -EINVAL;
435
436         return -EPERM;
437 #endif
438 }
439
440 int set_pio_mode(ide_drive_t *drive, int arg)
441 {
442         struct request *rq;
443         ide_hwif_t *hwif = drive->hwif;
444         const struct ide_port_ops *port_ops = hwif->port_ops;
445
446         if (arg < 0 || arg > 255)
447                 return -EINVAL;
448
449         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
450             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
451                 return -ENOSYS;
452
453         if (drive->special.b.set_tune)
454                 return -EBUSY;
455
456         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
457         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
458
459         drive->tune_req = (u8) arg;
460         drive->special.b.set_tune = 1;
461
462         blk_execute_rq(drive->queue, NULL, rq, 0);
463         blk_put_request(rq);
464
465         return 0;
466 }
467
468 static int set_unmaskirq(ide_drive_t *drive, int arg)
469 {
470         if (drive->no_unmask)
471                 return -EPERM;
472
473         if (arg < 0 || arg > 1)
474                 return -EINVAL;
475
476         if (ide_spin_wait_hwgroup(drive))
477                 return -EBUSY;
478         drive->unmask = arg;
479         spin_unlock_irq(&ide_lock);
480
481         return 0;
482 }
483
484 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
485 {
486         ide_drive_t *drive = dev->driver_data;
487         ide_hwif_t *hwif = HWIF(drive);
488         struct request *rq;
489         struct request_pm_state rqpm;
490         ide_task_t args;
491         int ret;
492
493         /* Call ACPI _GTM only once */
494         if (!(drive->dn % 2))
495                 ide_acpi_get_timing(hwif);
496
497         memset(&rqpm, 0, sizeof(rqpm));
498         memset(&args, 0, sizeof(args));
499         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
500         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
501         rq->special = &args;
502         rq->data = &rqpm;
503         rqpm.pm_step = ide_pm_state_start_suspend;
504         if (mesg.event == PM_EVENT_PRETHAW)
505                 mesg.event = PM_EVENT_FREEZE;
506         rqpm.pm_state = mesg.event;
507
508         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
509         blk_put_request(rq);
510         /* only call ACPI _PS3 after both drivers are suspended */
511         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
512                  && hwif->drives[1].present)
513                  || !hwif->drives[0].present
514                  || !hwif->drives[1].present))
515                 ide_acpi_set_state(hwif, 0);
516         return ret;
517 }
518
519 static int generic_ide_resume(struct device *dev)
520 {
521         ide_drive_t *drive = dev->driver_data;
522         ide_hwif_t *hwif = HWIF(drive);
523         struct request *rq;
524         struct request_pm_state rqpm;
525         ide_task_t args;
526         int err;
527
528         /* Call ACPI _STM only once */
529         if (!(drive->dn % 2)) {
530                 ide_acpi_set_state(hwif, 1);
531                 ide_acpi_push_timing(hwif);
532         }
533
534         ide_acpi_exec_tfs(drive);
535
536         memset(&rqpm, 0, sizeof(rqpm));
537         memset(&args, 0, sizeof(args));
538         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
539         rq->cmd_type = REQ_TYPE_PM_RESUME;
540         rq->cmd_flags |= REQ_PREEMPT;
541         rq->special = &args;
542         rq->data = &rqpm;
543         rqpm.pm_step = ide_pm_state_start_resume;
544         rqpm.pm_state = PM_EVENT_ON;
545
546         err = blk_execute_rq(drive->queue, NULL, rq, 1);
547         blk_put_request(rq);
548
549         if (err == 0 && dev->driver) {
550                 ide_driver_t *drv = to_ide_driver(dev->driver);
551
552                 if (drv->resume)
553                         drv->resume(drive);
554         }
555
556         return err;
557 }
558
559 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
560                         unsigned int cmd, unsigned long arg)
561 {
562         unsigned long flags;
563         ide_driver_t *drv;
564         void __user *p = (void __user *)arg;
565         int err = 0, (*setfunc)(ide_drive_t *, int);
566         u8 *val;
567
568         switch (cmd) {
569         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
570         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
571         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
572         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
573         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
574         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
575         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
576         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
577         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
578         }
579
580         switch (cmd) {
581                 case HDIO_OBSOLETE_IDENTITY:
582                 case HDIO_GET_IDENTITY:
583                         if (bdev != bdev->bd_contains)
584                                 return -EINVAL;
585                         if (drive->id_read == 0)
586                                 return -ENOMSG;
587                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
588                                 return -EFAULT;
589                         return 0;
590
591                 case HDIO_GET_NICE:
592                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
593                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
594                                         drive->nice1 << IDE_NICE_1,
595                                         (long __user *) arg);
596 #ifdef CONFIG_IDE_TASK_IOCTL
597                 case HDIO_DRIVE_TASKFILE:
598                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
599                                 return -EACCES;
600                         switch(drive->media) {
601                                 case ide_disk:
602                                         return ide_taskfile_ioctl(drive, cmd, arg);
603                                 default:
604                                         return -ENOMSG;
605                         }
606 #endif /* CONFIG_IDE_TASK_IOCTL */
607
608                 case HDIO_DRIVE_CMD:
609                         if (!capable(CAP_SYS_RAWIO))
610                                 return -EACCES;
611                         return ide_cmd_ioctl(drive, cmd, arg);
612
613                 case HDIO_DRIVE_TASK:
614                         if (!capable(CAP_SYS_RAWIO))
615                                 return -EACCES;
616                         return ide_task_ioctl(drive, cmd, arg);
617                 case HDIO_SET_NICE:
618                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
619                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
620                                 return -EPERM;
621                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
622                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
623                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
624                                 drive->dsc_overlap = 0;
625                                 return -EPERM;
626                         }
627                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
628                         return 0;
629                 case HDIO_DRIVE_RESET:
630                         if (!capable(CAP_SYS_ADMIN))
631                                 return -EACCES;
632
633                         /*
634                          *      Abort the current command on the
635                          *      group if there is one, taking
636                          *      care not to allow anything else
637                          *      to be queued and to die on the
638                          *      spot if we miss one somehow
639                          */
640
641                         spin_lock_irqsave(&ide_lock, flags);
642
643                         if (HWGROUP(drive)->resetting) {
644                                 spin_unlock_irqrestore(&ide_lock, flags);
645                                 return -EBUSY;
646                         }
647
648                         ide_abort(drive, "drive reset");
649
650                         BUG_ON(HWGROUP(drive)->handler);
651
652                         /* Ensure nothing gets queued after we
653                            drop the lock. Reset will clear the busy */
654
655                         HWGROUP(drive)->busy = 1;
656                         spin_unlock_irqrestore(&ide_lock, flags);
657                         (void) ide_do_reset(drive);
658
659                         return 0;
660                 case HDIO_GET_BUSSTATE:
661                         if (!capable(CAP_SYS_ADMIN))
662                                 return -EACCES;
663                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
664                                 return -EFAULT;
665                         return 0;
666
667                 case HDIO_SET_BUSSTATE:
668                         if (!capable(CAP_SYS_ADMIN))
669                                 return -EACCES;
670                         return -EOPNOTSUPP;
671                 default:
672                         return -EINVAL;
673         }
674
675 read_val:
676         mutex_lock(&ide_setting_mtx);
677         spin_lock_irqsave(&ide_lock, flags);
678         err = *val;
679         spin_unlock_irqrestore(&ide_lock, flags);
680         mutex_unlock(&ide_setting_mtx);
681         return err >= 0 ? put_user(err, (long __user *)arg) : err;
682
683 set_val:
684         if (bdev != bdev->bd_contains)
685                 err = -EINVAL;
686         else {
687                 if (!capable(CAP_SYS_ADMIN))
688                         err = -EACCES;
689                 else {
690                         mutex_lock(&ide_setting_mtx);
691                         err = setfunc(drive, arg);
692                         mutex_unlock(&ide_setting_mtx);
693                 }
694         }
695         return err;
696 }
697
698 EXPORT_SYMBOL(generic_ide_ioctl);
699
700 static int ide_bus_match(struct device *dev, struct device_driver *drv)
701 {
702         return 1;
703 }
704
705 static char *media_string(ide_drive_t *drive)
706 {
707         switch (drive->media) {
708         case ide_disk:
709                 return "disk";
710         case ide_cdrom:
711                 return "cdrom";
712         case ide_tape:
713                 return "tape";
714         case ide_floppy:
715                 return "floppy";
716         case ide_optical:
717                 return "optical";
718         default:
719                 return "UNKNOWN";
720         }
721 }
722
723 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
724 {
725         ide_drive_t *drive = to_ide_device(dev);
726         return sprintf(buf, "%s\n", media_string(drive));
727 }
728
729 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
730 {
731         ide_drive_t *drive = to_ide_device(dev);
732         return sprintf(buf, "%s\n", drive->name);
733 }
734
735 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
736 {
737         ide_drive_t *drive = to_ide_device(dev);
738         return sprintf(buf, "ide:m-%s\n", media_string(drive));
739 }
740
741 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
742                           char *buf)
743 {
744         ide_drive_t *drive = to_ide_device(dev);
745         return sprintf(buf, "%s\n", drive->id->model);
746 }
747
748 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
749                              char *buf)
750 {
751         ide_drive_t *drive = to_ide_device(dev);
752         return sprintf(buf, "%s\n", drive->id->fw_rev);
753 }
754
755 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
756                            char *buf)
757 {
758         ide_drive_t *drive = to_ide_device(dev);
759         return sprintf(buf, "%s\n", drive->id->serial_no);
760 }
761
762 static struct device_attribute ide_dev_attrs[] = {
763         __ATTR_RO(media),
764         __ATTR_RO(drivename),
765         __ATTR_RO(modalias),
766         __ATTR_RO(model),
767         __ATTR_RO(firmware),
768         __ATTR(serial, 0400, serial_show, NULL),
769         __ATTR_NULL
770 };
771
772 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
773 {
774         ide_drive_t *drive = to_ide_device(dev);
775
776         add_uevent_var(env, "MEDIA=%s", media_string(drive));
777         add_uevent_var(env, "DRIVENAME=%s", drive->name);
778         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
779         return 0;
780 }
781
782 static int generic_ide_probe(struct device *dev)
783 {
784         ide_drive_t *drive = to_ide_device(dev);
785         ide_driver_t *drv = to_ide_driver(dev->driver);
786
787         return drv->probe ? drv->probe(drive) : -ENODEV;
788 }
789
790 static int generic_ide_remove(struct device *dev)
791 {
792         ide_drive_t *drive = to_ide_device(dev);
793         ide_driver_t *drv = to_ide_driver(dev->driver);
794
795         if (drv->remove)
796                 drv->remove(drive);
797
798         return 0;
799 }
800
801 static void generic_ide_shutdown(struct device *dev)
802 {
803         ide_drive_t *drive = to_ide_device(dev);
804         ide_driver_t *drv = to_ide_driver(dev->driver);
805
806         if (dev->driver && drv->shutdown)
807                 drv->shutdown(drive);
808 }
809
810 struct bus_type ide_bus_type = {
811         .name           = "ide",
812         .match          = ide_bus_match,
813         .uevent         = ide_uevent,
814         .probe          = generic_ide_probe,
815         .remove         = generic_ide_remove,
816         .shutdown       = generic_ide_shutdown,
817         .dev_attrs      = ide_dev_attrs,
818         .suspend        = generic_ide_suspend,
819         .resume         = generic_ide_resume,
820 };
821
822 EXPORT_SYMBOL_GPL(ide_bus_type);
823
824 int ide_vlb_clk;
825 EXPORT_SYMBOL_GPL(ide_vlb_clk);
826
827 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
828 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
829
830 int ide_pci_clk;
831 EXPORT_SYMBOL_GPL(ide_pci_clk);
832
833 module_param_named(pci_clock, ide_pci_clk, int, 0);
834 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
835
836 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
837 {
838         int a, b, i, j = 1;
839         unsigned int *dev_param_mask = (unsigned int *)kp->arg;
840
841         if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
842             sscanf(s, "%d.%d", &a, &b) != 2)
843                 return -EINVAL;
844
845         i = a * MAX_DRIVES + b;
846
847         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
848                 return -EINVAL;
849
850         if (j)
851                 *dev_param_mask |= (1 << i);
852         else
853                 *dev_param_mask &= (1 << i);
854
855         return 0;
856 }
857
858 static unsigned int ide_nodma;
859
860 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
861 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
862
863 static unsigned int ide_noflush;
864
865 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
866 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
867
868 static unsigned int ide_noprobe;
869
870 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
871 MODULE_PARM_DESC(noprobe, "skip probing for a device");
872
873 static unsigned int ide_nowerr;
874
875 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
876 MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device");
877
878 static unsigned int ide_cdroms;
879
880 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
881 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
882
883 struct chs_geom {
884         unsigned int    cyl;
885         u8              head;
886         u8              sect;
887 };
888
889 static unsigned int ide_disks;
890 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
891
892 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
893 {
894         int a, b, c = 0, h = 0, s = 0, i, j = 1;
895
896         if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
897             sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
898                 return -EINVAL;
899
900         i = a * MAX_DRIVES + b;
901
902         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
903                 return -EINVAL;
904
905         if (c > INT_MAX || h > 255 || s > 255)
906                 return -EINVAL;
907
908         if (j)
909                 ide_disks |= (1 << i);
910         else
911                 ide_disks &= (1 << i);
912
913         ide_disks_chs[i].cyl  = c;
914         ide_disks_chs[i].head = h;
915         ide_disks_chs[i].sect = s;
916
917         return 0;
918 }
919
920 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
921 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
922
923 static void ide_dev_apply_params(ide_drive_t *drive)
924 {
925         int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
926
927         if (ide_nodma & (1 << i)) {
928                 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
929                 drive->nodma = 1;
930         }
931         if (ide_noflush & (1 << i)) {
932                 printk(KERN_INFO "ide: disabling flush requests for %s\n",
933                                  drive->name);
934                 drive->noflush = 1;
935         }
936         if (ide_noprobe & (1 << i)) {
937                 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
938                 drive->noprobe = 1;
939         }
940         if (ide_nowerr & (1 << i)) {
941                 printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n",
942                                  drive->name);
943                 drive->bad_wstat = BAD_R_STAT;
944         }
945         if (ide_cdroms & (1 << i)) {
946                 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
947                 drive->present = 1;
948                 drive->media = ide_cdrom;
949                 /* an ATAPI device ignores DRDY */
950                 drive->ready_stat = 0;
951         }
952         if (ide_disks & (1 << i)) {
953                 drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
954                 drive->head = drive->bios_head = ide_disks_chs[i].head;
955                 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
956                 drive->forced_geom = 1;
957                 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
958                                  drive->name,
959                                  drive->cyl, drive->head, drive->sect);
960                 drive->present = 1;
961                 drive->media = ide_disk;
962                 drive->ready_stat = READY_STAT;
963         }
964 }
965
966 static unsigned int ide_ignore_cable;
967
968 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
969 {
970         int i, j = 1;
971
972         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
973                 return -EINVAL;
974
975         if (i >= MAX_HWIFS || j < 0 || j > 1)
976                 return -EINVAL;
977
978         if (j)
979                 ide_ignore_cable |= (1 << i);
980         else
981                 ide_ignore_cable &= (1 << i);
982
983         return 0;
984 }
985
986 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
987 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
988
989 void ide_port_apply_params(ide_hwif_t *hwif)
990 {
991         int i;
992
993         if (ide_ignore_cable & (1 << hwif->index)) {
994                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
995                                  hwif->name);
996                 hwif->cbl = ATA_CBL_PATA40_SHORT;
997         }
998
999         for (i = 0; i < MAX_DRIVES; i++)
1000                 ide_dev_apply_params(&hwif->drives[i]);
1001 }
1002
1003 /*
1004  * This is gets invoked once during initialization, to set *everything* up
1005  */
1006 static int __init ide_init(void)
1007 {
1008         int ret;
1009
1010         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
1011
1012         ret = bus_register(&ide_bus_type);
1013         if (ret < 0) {
1014                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1015                 return ret;
1016         }
1017
1018         ide_port_class = class_create(THIS_MODULE, "ide_port");
1019         if (IS_ERR(ide_port_class)) {
1020                 ret = PTR_ERR(ide_port_class);
1021                 goto out_port_class;
1022         }
1023
1024         init_ide_data();
1025
1026         proc_ide_create();
1027
1028         return 0;
1029
1030 out_port_class:
1031         bus_unregister(&ide_bus_type);
1032
1033         return ret;
1034 }
1035
1036 static void __exit ide_exit(void)
1037 {
1038         proc_ide_destroy();
1039
1040         class_destroy(ide_port_class);
1041
1042         bus_unregister(&ide_bus_type);
1043 }
1044
1045 module_init(ide_init);
1046 module_exit(ide_exit);
1047
1048 MODULE_LICENSE("GPL");