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