ide: remove obsoleted "hdx=" kernel parameters
[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  __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
91
92 int noautodma = 0;
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->ctl                      = 0x08;
140                 drive->ready_stat               = READY_STAT;
141                 drive->bad_wstat                = BAD_W_STAT;
142                 drive->special.b.recalibrate    = 1;
143                 drive->special.b.set_geometry   = 1;
144                 drive->name[0]                  = 'h';
145                 drive->name[1]                  = 'd';
146                 drive->name[2]                  = 'a' + j;
147                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
148
149                 INIT_LIST_HEAD(&drive->list);
150                 init_completion(&drive->gendev_rel_comp);
151         }
152 }
153
154 /*
155  * init_ide_data() sets reasonable default values into all fields
156  * of all instances of the hwifs and drives, but only on the first call.
157  * Subsequent calls have no effect (they don't wipe out anything).
158  *
159  * This routine is normally called at driver initialization time,
160  * but may also be called MUCH earlier during kernel "command-line"
161  * parameter processing.  As such, we cannot depend on any other parts
162  * of the kernel (such as memory allocation) to be functioning yet.
163  *
164  * This is too bad, as otherwise we could dynamically allocate the
165  * ide_drive_t structs as needed, rather than always consuming memory
166  * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
167  *
168  * FIXME: We should stuff the setup data into __init and copy the
169  * relevant hwifs/allocate them properly during boot.
170  */
171 #define MAGIC_COOKIE 0x12345678
172 static void __init init_ide_data (void)
173 {
174         unsigned int index;
175         static unsigned long magic_cookie = MAGIC_COOKIE;
176
177         if (magic_cookie != MAGIC_COOKIE)
178                 return;         /* already initialized */
179         magic_cookie = 0;
180
181         /* Initialise all interface structures */
182         for (index = 0; index < MAX_HWIFS; ++index) {
183                 ide_hwif_t *hwif = &ide_hwifs[index];
184
185                 ide_init_port_data(hwif, index);
186         }
187 }
188
189 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
190 {
191         ide_hwgroup_t *hwgroup = hwif->hwgroup;
192
193         spin_lock_irq(&ide_lock);
194         /*
195          * Remove us from the hwgroup, and free
196          * the hwgroup if we were the only member
197          */
198         if (hwif->next == hwif) {
199                 BUG_ON(hwgroup->hwif != hwif);
200                 kfree(hwgroup);
201         } else {
202                 /* There is another interface in hwgroup.
203                  * Unlink us, and set hwgroup->drive and ->hwif to
204                  * something sane.
205                  */
206                 ide_hwif_t *g = hwgroup->hwif;
207
208                 while (g->next != hwif)
209                         g = g->next;
210                 g->next = hwif->next;
211                 if (hwgroup->hwif == hwif) {
212                         /* Chose a random hwif for hwgroup->hwif.
213                          * It's guaranteed that there are no drives
214                          * left in the hwgroup.
215                          */
216                         BUG_ON(hwgroup->drive != NULL);
217                         hwgroup->hwif = g;
218                 }
219                 BUG_ON(hwgroup->hwif == hwif);
220         }
221         spin_unlock_irq(&ide_lock);
222 }
223
224 /* Called with ide_lock held. */
225 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
226 {
227         int i;
228
229         for (i = 0; i < MAX_DRIVES; i++) {
230                 ide_drive_t *drive = &hwif->drives[i];
231
232                 if (drive->present) {
233                         spin_unlock_irq(&ide_lock);
234                         device_unregister(&drive->gendev);
235                         wait_for_completion(&drive->gendev_rel_comp);
236                         spin_lock_irq(&ide_lock);
237                 }
238         }
239 }
240
241 void ide_port_unregister_devices(ide_hwif_t *hwif)
242 {
243         mutex_lock(&ide_cfg_mtx);
244         spin_lock_irq(&ide_lock);
245         __ide_port_unregister_devices(hwif);
246         hwif->present = 0;
247         ide_port_init_devices_data(hwif);
248         spin_unlock_irq(&ide_lock);
249         mutex_unlock(&ide_cfg_mtx);
250 }
251 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
252
253 /**
254  *      ide_unregister          -       free an IDE interface
255  *      @hwif: IDE interface
256  *
257  *      Perform the final unregister of an IDE interface. At the moment
258  *      we don't refcount interfaces so this will also get split up.
259  *
260  *      Locking:
261  *      The caller must not hold the IDE locks
262  *      The drive present/vanishing is not yet properly locked
263  *      Take care with the callbacks. These have been split to avoid
264  *      deadlocking the IDE layer. The shutdown callback is called
265  *      before we take the lock and free resources. It is up to the
266  *      caller to be sure there is no pending I/O here, and that
267  *      the interface will not be reopened (present/vanishing locking
268  *      isn't yet done BTW). After we commit to the final kill we
269  *      call the cleanup callback with the ide locks held.
270  *
271  *      Unregister restores the hwif structures to the default state.
272  *      This is raving bonkers.
273  */
274
275 void ide_unregister(ide_hwif_t *hwif)
276 {
277         ide_hwif_t *g;
278         ide_hwgroup_t *hwgroup;
279         int irq_count = 0;
280
281         BUG_ON(in_interrupt());
282         BUG_ON(irqs_disabled());
283
284         mutex_lock(&ide_cfg_mtx);
285
286         spin_lock_irq(&ide_lock);
287         if (hwif->present) {
288                 __ide_port_unregister_devices(hwif);
289                 hwif->present = 0;
290         }
291         spin_unlock_irq(&ide_lock);
292
293         ide_proc_unregister_port(hwif);
294
295         hwgroup = hwif->hwgroup;
296         /*
297          * free the irq if we were the only hwif using it
298          */
299         g = hwgroup->hwif;
300         do {
301                 if (g->irq == hwif->irq)
302                         ++irq_count;
303                 g = g->next;
304         } while (g != hwgroup->hwif);
305         if (irq_count == 1)
306                 free_irq(hwif->irq, hwgroup);
307
308         ide_remove_port_from_hwgroup(hwif);
309
310         device_unregister(hwif->portdev);
311         device_unregister(&hwif->gendev);
312         wait_for_completion(&hwif->gendev_rel_comp);
313
314         /*
315          * Remove us from the kernel's knowledge
316          */
317         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
318         kfree(hwif->sg_table);
319         unregister_blkdev(hwif->major, hwif->name);
320
321         if (hwif->dma_base)
322                 ide_release_dma_engine(hwif);
323
324         spin_lock_irq(&ide_lock);
325         /* restore hwif data to pristine status */
326         ide_init_port_data(hwif, hwif->index);
327         spin_unlock_irq(&ide_lock);
328
329         mutex_unlock(&ide_cfg_mtx);
330 }
331
332 EXPORT_SYMBOL(ide_unregister);
333
334 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
335 {
336         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
337         hwif->irq = hw->irq;
338         hwif->chipset = hw->chipset;
339         hwif->gendev.parent = hw->dev;
340         hwif->ack_intr = hw->ack_intr;
341 }
342 EXPORT_SYMBOL_GPL(ide_init_port_hw);
343
344 /*
345  *      Locks for IDE setting functionality
346  */
347
348 DEFINE_MUTEX(ide_setting_mtx);
349
350 EXPORT_SYMBOL_GPL(ide_setting_mtx);
351
352 /**
353  *      ide_spin_wait_hwgroup   -       wait for group
354  *      @drive: drive in the group
355  *
356  *      Wait for an IDE device group to go non busy and then return
357  *      holding the ide_lock which guards the hwgroup->busy status
358  *      and right to use it.
359  */
360
361 int ide_spin_wait_hwgroup (ide_drive_t *drive)
362 {
363         ide_hwgroup_t *hwgroup = HWGROUP(drive);
364         unsigned long timeout = jiffies + (3 * HZ);
365
366         spin_lock_irq(&ide_lock);
367
368         while (hwgroup->busy) {
369                 unsigned long lflags;
370                 spin_unlock_irq(&ide_lock);
371                 local_irq_set(lflags);
372                 if (time_after(jiffies, timeout)) {
373                         local_irq_restore(lflags);
374                         printk(KERN_ERR "%s: channel busy\n", drive->name);
375                         return -EBUSY;
376                 }
377                 local_irq_restore(lflags);
378                 spin_lock_irq(&ide_lock);
379         }
380         return 0;
381 }
382
383 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
384
385 int set_io_32bit(ide_drive_t *drive, int arg)
386 {
387         if (drive->no_io_32bit)
388                 return -EPERM;
389
390         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
391                 return -EINVAL;
392
393         if (ide_spin_wait_hwgroup(drive))
394                 return -EBUSY;
395
396         drive->io_32bit = arg;
397
398         spin_unlock_irq(&ide_lock);
399
400         return 0;
401 }
402
403 static int set_ksettings(ide_drive_t *drive, int arg)
404 {
405         if (arg < 0 || arg > 1)
406                 return -EINVAL;
407
408         if (ide_spin_wait_hwgroup(drive))
409                 return -EBUSY;
410         drive->keep_settings = arg;
411         spin_unlock_irq(&ide_lock);
412
413         return 0;
414 }
415
416 int set_using_dma(ide_drive_t *drive, int arg)
417 {
418 #ifdef CONFIG_BLK_DEV_IDEDMA
419         ide_hwif_t *hwif = drive->hwif;
420         int err = -EPERM;
421
422         if (arg < 0 || arg > 1)
423                 return -EINVAL;
424
425         if (!drive->id || !(drive->id->capability & 1))
426                 goto out;
427
428         if (hwif->dma_ops == NULL)
429                 goto out;
430
431         err = -EBUSY;
432         if (ide_spin_wait_hwgroup(drive))
433                 goto out;
434         /*
435          * set ->busy flag, unlock and let it ride
436          */
437         hwif->hwgroup->busy = 1;
438         spin_unlock_irq(&ide_lock);
439
440         err = 0;
441
442         if (arg) {
443                 if (ide_set_dma(drive))
444                         err = -EIO;
445         } else
446                 ide_dma_off(drive);
447
448         /*
449          * lock, clear ->busy flag and unlock before leaving
450          */
451         spin_lock_irq(&ide_lock);
452         hwif->hwgroup->busy = 0;
453         spin_unlock_irq(&ide_lock);
454 out:
455         return err;
456 #else
457         if (arg < 0 || arg > 1)
458                 return -EINVAL;
459
460         return -EPERM;
461 #endif
462 }
463
464 int set_pio_mode(ide_drive_t *drive, int arg)
465 {
466         struct request *rq;
467         ide_hwif_t *hwif = drive->hwif;
468         const struct ide_port_ops *port_ops = hwif->port_ops;
469
470         if (arg < 0 || arg > 255)
471                 return -EINVAL;
472
473         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
474             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
475                 return -ENOSYS;
476
477         if (drive->special.b.set_tune)
478                 return -EBUSY;
479
480         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
481         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
482
483         drive->tune_req = (u8) arg;
484         drive->special.b.set_tune = 1;
485
486         blk_execute_rq(drive->queue, NULL, rq, 0);
487         blk_put_request(rq);
488
489         return 0;
490 }
491
492 static int set_unmaskirq(ide_drive_t *drive, int arg)
493 {
494         if (drive->no_unmask)
495                 return -EPERM;
496
497         if (arg < 0 || arg > 1)
498                 return -EINVAL;
499
500         if (ide_spin_wait_hwgroup(drive))
501                 return -EBUSY;
502         drive->unmask = arg;
503         spin_unlock_irq(&ide_lock);
504
505         return 0;
506 }
507
508 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
509 {
510         ide_drive_t *drive = dev->driver_data;
511         ide_hwif_t *hwif = HWIF(drive);
512         struct request *rq;
513         struct request_pm_state rqpm;
514         ide_task_t args;
515         int ret;
516
517         /* Call ACPI _GTM only once */
518         if (!(drive->dn % 2))
519                 ide_acpi_get_timing(hwif);
520
521         memset(&rqpm, 0, sizeof(rqpm));
522         memset(&args, 0, sizeof(args));
523         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
524         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
525         rq->special = &args;
526         rq->data = &rqpm;
527         rqpm.pm_step = ide_pm_state_start_suspend;
528         if (mesg.event == PM_EVENT_PRETHAW)
529                 mesg.event = PM_EVENT_FREEZE;
530         rqpm.pm_state = mesg.event;
531
532         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
533         blk_put_request(rq);
534         /* only call ACPI _PS3 after both drivers are suspended */
535         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
536                  && hwif->drives[1].present)
537                  || !hwif->drives[0].present
538                  || !hwif->drives[1].present))
539                 ide_acpi_set_state(hwif, 0);
540         return ret;
541 }
542
543 static int generic_ide_resume(struct device *dev)
544 {
545         ide_drive_t *drive = dev->driver_data;
546         ide_hwif_t *hwif = HWIF(drive);
547         struct request *rq;
548         struct request_pm_state rqpm;
549         ide_task_t args;
550         int err;
551
552         /* Call ACPI _STM only once */
553         if (!(drive->dn % 2)) {
554                 ide_acpi_set_state(hwif, 1);
555                 ide_acpi_push_timing(hwif);
556         }
557
558         ide_acpi_exec_tfs(drive);
559
560         memset(&rqpm, 0, sizeof(rqpm));
561         memset(&args, 0, sizeof(args));
562         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
563         rq->cmd_type = REQ_TYPE_PM_RESUME;
564         rq->cmd_flags |= REQ_PREEMPT;
565         rq->special = &args;
566         rq->data = &rqpm;
567         rqpm.pm_step = ide_pm_state_start_resume;
568         rqpm.pm_state = PM_EVENT_ON;
569
570         err = blk_execute_rq(drive->queue, NULL, rq, 1);
571         blk_put_request(rq);
572
573         if (err == 0 && dev->driver) {
574                 ide_driver_t *drv = to_ide_driver(dev->driver);
575
576                 if (drv->resume)
577                         drv->resume(drive);
578         }
579
580         return err;
581 }
582
583 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
584                         unsigned int cmd, unsigned long arg)
585 {
586         unsigned long flags;
587         ide_driver_t *drv;
588         void __user *p = (void __user *)arg;
589         int err = 0, (*setfunc)(ide_drive_t *, int);
590         u8 *val;
591
592         switch (cmd) {
593         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
594         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
595         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
596         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
597         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
598         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
599         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
600         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
601         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
602         }
603
604         switch (cmd) {
605                 case HDIO_OBSOLETE_IDENTITY:
606                 case HDIO_GET_IDENTITY:
607                         if (bdev != bdev->bd_contains)
608                                 return -EINVAL;
609                         if (drive->id_read == 0)
610                                 return -ENOMSG;
611                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
612                                 return -EFAULT;
613                         return 0;
614
615                 case HDIO_GET_NICE:
616                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
617                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
618                                         drive->nice1 << IDE_NICE_1,
619                                         (long __user *) arg);
620 #ifdef CONFIG_IDE_TASK_IOCTL
621                 case HDIO_DRIVE_TASKFILE:
622                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
623                                 return -EACCES;
624                         switch(drive->media) {
625                                 case ide_disk:
626                                         return ide_taskfile_ioctl(drive, cmd, arg);
627                                 default:
628                                         return -ENOMSG;
629                         }
630 #endif /* CONFIG_IDE_TASK_IOCTL */
631
632                 case HDIO_DRIVE_CMD:
633                         if (!capable(CAP_SYS_RAWIO))
634                                 return -EACCES;
635                         return ide_cmd_ioctl(drive, cmd, arg);
636
637                 case HDIO_DRIVE_TASK:
638                         if (!capable(CAP_SYS_RAWIO))
639                                 return -EACCES;
640                         return ide_task_ioctl(drive, cmd, arg);
641                 case HDIO_SET_NICE:
642                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
643                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
644                                 return -EPERM;
645                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
646                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
647                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
648                                 drive->dsc_overlap = 0;
649                                 return -EPERM;
650                         }
651                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
652                         return 0;
653                 case HDIO_DRIVE_RESET:
654                         if (!capable(CAP_SYS_ADMIN))
655                                 return -EACCES;
656
657                         /*
658                          *      Abort the current command on the
659                          *      group if there is one, taking
660                          *      care not to allow anything else
661                          *      to be queued and to die on the
662                          *      spot if we miss one somehow
663                          */
664
665                         spin_lock_irqsave(&ide_lock, flags);
666
667                         if (HWGROUP(drive)->resetting) {
668                                 spin_unlock_irqrestore(&ide_lock, flags);
669                                 return -EBUSY;
670                         }
671
672                         ide_abort(drive, "drive reset");
673
674                         BUG_ON(HWGROUP(drive)->handler);
675
676                         /* Ensure nothing gets queued after we
677                            drop the lock. Reset will clear the busy */
678
679                         HWGROUP(drive)->busy = 1;
680                         spin_unlock_irqrestore(&ide_lock, flags);
681                         (void) ide_do_reset(drive);
682
683                         return 0;
684                 case HDIO_GET_BUSSTATE:
685                         if (!capable(CAP_SYS_ADMIN))
686                                 return -EACCES;
687                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
688                                 return -EFAULT;
689                         return 0;
690
691                 case HDIO_SET_BUSSTATE:
692                         if (!capable(CAP_SYS_ADMIN))
693                                 return -EACCES;
694                         return -EOPNOTSUPP;
695                 default:
696                         return -EINVAL;
697         }
698
699 read_val:
700         mutex_lock(&ide_setting_mtx);
701         spin_lock_irqsave(&ide_lock, flags);
702         err = *val;
703         spin_unlock_irqrestore(&ide_lock, flags);
704         mutex_unlock(&ide_setting_mtx);
705         return err >= 0 ? put_user(err, (long __user *)arg) : err;
706
707 set_val:
708         if (bdev != bdev->bd_contains)
709                 err = -EINVAL;
710         else {
711                 if (!capable(CAP_SYS_ADMIN))
712                         err = -EACCES;
713                 else {
714                         mutex_lock(&ide_setting_mtx);
715                         err = setfunc(drive, arg);
716                         mutex_unlock(&ide_setting_mtx);
717                 }
718         }
719         return err;
720 }
721
722 EXPORT_SYMBOL(generic_ide_ioctl);
723
724 /*
725  * ide_setup() gets called VERY EARLY during initialization,
726  * to handle kernel "command line" strings beginning with "ide".
727  *
728  * Remember to update Documentation/ide/ide.txt if you change something here.
729  */
730 static int __init ide_setup(char *s)
731 {
732         printk(KERN_INFO "ide_setup: %s", s);
733         init_ide_data ();
734
735 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
736         if (!strcmp(s, "ide=doubler")) {
737                 extern int ide_doubler;
738
739                 printk(" : Enabled support for IDE doublers\n");
740                 ide_doubler = 1;
741                 goto obsolete_option;
742         }
743 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
744
745         if (!strcmp(s, "ide=nodma")) {
746                 printk(" : Prevented DMA\n");
747                 noautodma = 1;
748                 goto obsolete_option;
749         }
750
751 #ifdef CONFIG_BLK_DEV_IDEACPI
752         if (!strcmp(s, "ide=noacpi")) {
753                 //printk(" : Disable IDE ACPI support.\n");
754                 ide_noacpi = 1;
755                 goto obsolete_option;
756         }
757         if (!strcmp(s, "ide=acpigtf")) {
758                 //printk(" : Enable IDE ACPI _GTF support.\n");
759                 ide_acpigtf = 1;
760                 goto obsolete_option;
761         }
762         if (!strcmp(s, "ide=acpionboot")) {
763                 //printk(" : Call IDE ACPI methods on boot.\n");
764                 ide_acpionboot = 1;
765                 goto obsolete_option;
766         }
767 #endif /* CONFIG_BLK_DEV_IDEACPI */
768
769         printk(" -- BAD OPTION\n");
770         return 1;
771 obsolete_option:
772         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
773         return 1;
774 }
775
776 EXPORT_SYMBOL(ide_lock);
777
778 static int ide_bus_match(struct device *dev, struct device_driver *drv)
779 {
780         return 1;
781 }
782
783 static char *media_string(ide_drive_t *drive)
784 {
785         switch (drive->media) {
786         case ide_disk:
787                 return "disk";
788         case ide_cdrom:
789                 return "cdrom";
790         case ide_tape:
791                 return "tape";
792         case ide_floppy:
793                 return "floppy";
794         case ide_optical:
795                 return "optical";
796         default:
797                 return "UNKNOWN";
798         }
799 }
800
801 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
802 {
803         ide_drive_t *drive = to_ide_device(dev);
804         return sprintf(buf, "%s\n", media_string(drive));
805 }
806
807 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
808 {
809         ide_drive_t *drive = to_ide_device(dev);
810         return sprintf(buf, "%s\n", drive->name);
811 }
812
813 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
814 {
815         ide_drive_t *drive = to_ide_device(dev);
816         return sprintf(buf, "ide:m-%s\n", media_string(drive));
817 }
818
819 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
820                           char *buf)
821 {
822         ide_drive_t *drive = to_ide_device(dev);
823         return sprintf(buf, "%s\n", drive->id->model);
824 }
825
826 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
827                              char *buf)
828 {
829         ide_drive_t *drive = to_ide_device(dev);
830         return sprintf(buf, "%s\n", drive->id->fw_rev);
831 }
832
833 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
834                            char *buf)
835 {
836         ide_drive_t *drive = to_ide_device(dev);
837         return sprintf(buf, "%s\n", drive->id->serial_no);
838 }
839
840 static struct device_attribute ide_dev_attrs[] = {
841         __ATTR_RO(media),
842         __ATTR_RO(drivename),
843         __ATTR_RO(modalias),
844         __ATTR_RO(model),
845         __ATTR_RO(firmware),
846         __ATTR(serial, 0400, serial_show, NULL),
847         __ATTR_NULL
848 };
849
850 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
851 {
852         ide_drive_t *drive = to_ide_device(dev);
853
854         add_uevent_var(env, "MEDIA=%s", media_string(drive));
855         add_uevent_var(env, "DRIVENAME=%s", drive->name);
856         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
857         return 0;
858 }
859
860 static int generic_ide_probe(struct device *dev)
861 {
862         ide_drive_t *drive = to_ide_device(dev);
863         ide_driver_t *drv = to_ide_driver(dev->driver);
864
865         return drv->probe ? drv->probe(drive) : -ENODEV;
866 }
867
868 static int generic_ide_remove(struct device *dev)
869 {
870         ide_drive_t *drive = to_ide_device(dev);
871         ide_driver_t *drv = to_ide_driver(dev->driver);
872
873         if (drv->remove)
874                 drv->remove(drive);
875
876         return 0;
877 }
878
879 static void generic_ide_shutdown(struct device *dev)
880 {
881         ide_drive_t *drive = to_ide_device(dev);
882         ide_driver_t *drv = to_ide_driver(dev->driver);
883
884         if (dev->driver && drv->shutdown)
885                 drv->shutdown(drive);
886 }
887
888 struct bus_type ide_bus_type = {
889         .name           = "ide",
890         .match          = ide_bus_match,
891         .uevent         = ide_uevent,
892         .probe          = generic_ide_probe,
893         .remove         = generic_ide_remove,
894         .shutdown       = generic_ide_shutdown,
895         .dev_attrs      = ide_dev_attrs,
896         .suspend        = generic_ide_suspend,
897         .resume         = generic_ide_resume,
898 };
899
900 EXPORT_SYMBOL_GPL(ide_bus_type);
901
902 int ide_vlb_clk;
903 EXPORT_SYMBOL_GPL(ide_vlb_clk);
904
905 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
906 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
907
908 int ide_pci_clk;
909 EXPORT_SYMBOL_GPL(ide_pci_clk);
910
911 module_param_named(pci_clock, ide_pci_clk, int, 0);
912 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
913
914 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
915 {
916         int a, b, i, j = 1;
917         unsigned int *dev_param_mask = (unsigned int *)kp->arg;
918
919         if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
920             sscanf(s, "%d.%d", &a, &b) != 2)
921                 return -EINVAL;
922
923         i = a * MAX_DRIVES + b;
924
925         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
926                 return -EINVAL;
927
928         if (j)
929                 *dev_param_mask |= (1 << i);
930         else
931                 *dev_param_mask &= (1 << i);
932
933         return 0;
934 }
935
936 static unsigned int ide_nodma;
937
938 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
939 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
940
941 static unsigned int ide_noflush;
942
943 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
944 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
945
946 static unsigned int ide_noprobe;
947
948 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
949 MODULE_PARM_DESC(noprobe, "skip probing for a device");
950
951 static unsigned int ide_nowerr;
952
953 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
954 MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device");
955
956 static unsigned int ide_cdroms;
957
958 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
959 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
960
961 struct chs_geom {
962         unsigned int    cyl;
963         u8              head;
964         u8              sect;
965 };
966
967 static unsigned int ide_disks;
968 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
969
970 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
971 {
972         int a, b, c = 0, h = 0, s = 0, i, j = 1;
973
974         if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
975             sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
976                 return -EINVAL;
977
978         i = a * MAX_DRIVES + b;
979
980         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
981                 return -EINVAL;
982
983         if (c > INT_MAX || h > 255 || s > 255)
984                 return -EINVAL;
985
986         if (j)
987                 ide_disks |= (1 << i);
988         else
989                 ide_disks &= (1 << i);
990
991         ide_disks_chs[i].cyl  = c;
992         ide_disks_chs[i].head = h;
993         ide_disks_chs[i].sect = s;
994
995         return 0;
996 }
997
998 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
999 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
1000
1001 static void ide_dev_apply_params(ide_drive_t *drive)
1002 {
1003         int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
1004
1005         if (ide_nodma & (1 << i)) {
1006                 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
1007                 drive->nodma = 1;
1008         }
1009         if (ide_noflush & (1 << i)) {
1010                 printk(KERN_INFO "ide: disabling flush requests for %s\n",
1011                                  drive->name);
1012                 drive->noflush = 1;
1013         }
1014         if (ide_noprobe & (1 << i)) {
1015                 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
1016                 drive->noprobe = 1;
1017         }
1018         if (ide_nowerr & (1 << i)) {
1019                 printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n",
1020                                  drive->name);
1021                 drive->bad_wstat = BAD_R_STAT;
1022         }
1023         if (ide_cdroms & (1 << i)) {
1024                 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
1025                 drive->present = 1;
1026                 drive->media = ide_cdrom;
1027                 /* an ATAPI device ignores DRDY */
1028                 drive->ready_stat = 0;
1029         }
1030         if (ide_disks & (1 << i)) {
1031                 drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
1032                 drive->head = drive->bios_head = ide_disks_chs[i].head;
1033                 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
1034                 drive->forced_geom = 1;
1035                 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
1036                                  drive->name,
1037                                  drive->cyl, drive->head, drive->sect);
1038                 drive->present = 1;
1039                 drive->media = ide_disk;
1040                 drive->ready_stat = READY_STAT;
1041         }
1042 }
1043
1044 static unsigned int ide_ignore_cable;
1045
1046 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
1047 {
1048         int i, j = 1;
1049
1050         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
1051                 return -EINVAL;
1052
1053         if (i >= MAX_HWIFS || j < 0 || j > 1)
1054                 return -EINVAL;
1055
1056         if (j)
1057                 ide_ignore_cable |= (1 << i);
1058         else
1059                 ide_ignore_cable &= (1 << i);
1060
1061         return 0;
1062 }
1063
1064 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
1065 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
1066
1067 void ide_port_apply_params(ide_hwif_t *hwif)
1068 {
1069         int i;
1070
1071         if (ide_ignore_cable & (1 << hwif->index)) {
1072                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
1073                                  hwif->name);
1074                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1075         }
1076
1077         for (i = 0; i < MAX_DRIVES; i++)
1078                 ide_dev_apply_params(&hwif->drives[i]);
1079 }
1080
1081 /*
1082  * This is gets invoked once during initialization, to set *everything* up
1083  */
1084 static int __init ide_init(void)
1085 {
1086         int ret;
1087
1088         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
1089
1090         ret = bus_register(&ide_bus_type);
1091         if (ret < 0) {
1092                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1093                 return ret;
1094         }
1095
1096         ide_port_class = class_create(THIS_MODULE, "ide_port");
1097         if (IS_ERR(ide_port_class)) {
1098                 ret = PTR_ERR(ide_port_class);
1099                 goto out_port_class;
1100         }
1101
1102         init_ide_data();
1103
1104         proc_ide_create();
1105
1106         return 0;
1107
1108 out_port_class:
1109         bus_unregister(&ide_bus_type);
1110
1111         return ret;
1112 }
1113
1114 #ifdef MODULE
1115 static char *options = NULL;
1116 module_param(options, charp, 0);
1117 MODULE_LICENSE("GPL");
1118
1119 static void __init parse_options (char *line)
1120 {
1121         char *next = line;
1122
1123         if (line == NULL || !*line)
1124                 return;
1125         while ((line = next) != NULL) {
1126                 if ((next = strchr(line,' ')) != NULL)
1127                         *next++ = 0;
1128                 if (!ide_setup(line))
1129                         printk (KERN_INFO "Unknown option '%s'\n", line);
1130         }
1131 }
1132
1133 int __init init_module (void)
1134 {
1135         parse_options(options);
1136         return ide_init();
1137 }
1138
1139 void __exit cleanup_module (void)
1140 {
1141         proc_ide_destroy();
1142
1143         class_destroy(ide_port_class);
1144
1145         bus_unregister(&ide_bus_type);
1146 }
1147
1148 #else /* !MODULE */
1149
1150 __setup("", ide_setup);
1151
1152 module_init(ide_init);
1153
1154 #endif /* MODULE */