ide: add struct ide_host (take 3)
[linux-2.6] / 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         hwif->tp_ops = &default_tp_ops;
105
106         ide_port_init_devices_data(hwif);
107 }
108
109 static void ide_port_init_devices_data(ide_hwif_t *hwif)
110 {
111         int unit;
112
113         for (unit = 0; unit < MAX_DRIVES; ++unit) {
114                 ide_drive_t *drive = &hwif->drives[unit];
115                 u8 j = (hwif->index * MAX_DRIVES) + unit;
116
117                 memset(drive, 0, sizeof(*drive));
118
119                 drive->media                    = ide_disk;
120                 drive->select.all               = (unit<<4)|0xa0;
121                 drive->hwif                     = hwif;
122                 drive->ready_stat               = READY_STAT;
123                 drive->bad_wstat                = BAD_W_STAT;
124                 drive->special.b.recalibrate    = 1;
125                 drive->special.b.set_geometry   = 1;
126                 drive->name[0]                  = 'h';
127                 drive->name[1]                  = 'd';
128                 drive->name[2]                  = 'a' + j;
129                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
130
131                 INIT_LIST_HEAD(&drive->list);
132                 init_completion(&drive->gendev_rel_comp);
133         }
134 }
135
136 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
137 {
138         ide_hwgroup_t *hwgroup = hwif->hwgroup;
139
140         spin_lock_irq(&ide_lock);
141         /*
142          * Remove us from the hwgroup, and free
143          * the hwgroup if we were the only member
144          */
145         if (hwif->next == hwif) {
146                 BUG_ON(hwgroup->hwif != hwif);
147                 kfree(hwgroup);
148         } else {
149                 /* There is another interface in hwgroup.
150                  * Unlink us, and set hwgroup->drive and ->hwif to
151                  * something sane.
152                  */
153                 ide_hwif_t *g = hwgroup->hwif;
154
155                 while (g->next != hwif)
156                         g = g->next;
157                 g->next = hwif->next;
158                 if (hwgroup->hwif == hwif) {
159                         /* Chose a random hwif for hwgroup->hwif.
160                          * It's guaranteed that there are no drives
161                          * left in the hwgroup.
162                          */
163                         BUG_ON(hwgroup->drive != NULL);
164                         hwgroup->hwif = g;
165                 }
166                 BUG_ON(hwgroup->hwif == hwif);
167         }
168         spin_unlock_irq(&ide_lock);
169 }
170
171 /* Called with ide_lock held. */
172 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
173 {
174         int i;
175
176         for (i = 0; i < MAX_DRIVES; i++) {
177                 ide_drive_t *drive = &hwif->drives[i];
178
179                 if (drive->present) {
180                         spin_unlock_irq(&ide_lock);
181                         device_unregister(&drive->gendev);
182                         wait_for_completion(&drive->gendev_rel_comp);
183                         spin_lock_irq(&ide_lock);
184                 }
185         }
186 }
187
188 void ide_port_unregister_devices(ide_hwif_t *hwif)
189 {
190         mutex_lock(&ide_cfg_mtx);
191         spin_lock_irq(&ide_lock);
192         __ide_port_unregister_devices(hwif);
193         hwif->present = 0;
194         ide_port_init_devices_data(hwif);
195         spin_unlock_irq(&ide_lock);
196         mutex_unlock(&ide_cfg_mtx);
197 }
198 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
199
200 /**
201  *      ide_unregister          -       free an IDE interface
202  *      @hwif: IDE interface
203  *
204  *      Perform the final unregister of an IDE interface. At the moment
205  *      we don't refcount interfaces so this will also get split up.
206  *
207  *      Locking:
208  *      The caller must not hold the IDE locks
209  *      The drive present/vanishing is not yet properly locked
210  *      Take care with the callbacks. These have been split to avoid
211  *      deadlocking the IDE layer. The shutdown callback is called
212  *      before we take the lock and free resources. It is up to the
213  *      caller to be sure there is no pending I/O here, and that
214  *      the interface will not be reopened (present/vanishing locking
215  *      isn't yet done BTW). After we commit to the final kill we
216  *      call the cleanup callback with the ide locks held.
217  *
218  *      Unregister restores the hwif structures to the default state.
219  *      This is raving bonkers.
220  */
221
222 void ide_unregister(ide_hwif_t *hwif)
223 {
224         ide_hwif_t *g;
225         ide_hwgroup_t *hwgroup;
226         int irq_count = 0;
227
228         BUG_ON(in_interrupt());
229         BUG_ON(irqs_disabled());
230
231         mutex_lock(&ide_cfg_mtx);
232
233         spin_lock_irq(&ide_lock);
234         if (hwif->present) {
235                 __ide_port_unregister_devices(hwif);
236                 hwif->present = 0;
237         }
238         spin_unlock_irq(&ide_lock);
239
240         ide_proc_unregister_port(hwif);
241
242         hwgroup = hwif->hwgroup;
243         /*
244          * free the irq if we were the only hwif using it
245          */
246         g = hwgroup->hwif;
247         do {
248                 if (g->irq == hwif->irq)
249                         ++irq_count;
250                 g = g->next;
251         } while (g != hwgroup->hwif);
252         if (irq_count == 1)
253                 free_irq(hwif->irq, hwgroup);
254
255         ide_remove_port_from_hwgroup(hwif);
256
257         device_unregister(hwif->portdev);
258         device_unregister(&hwif->gendev);
259         wait_for_completion(&hwif->gendev_rel_comp);
260
261         /*
262          * Remove us from the kernel's knowledge
263          */
264         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
265         kfree(hwif->sg_table);
266         unregister_blkdev(hwif->major, hwif->name);
267
268         if (hwif->dma_base)
269                 ide_release_dma_engine(hwif);
270
271         spin_lock_irq(&ide_lock);
272         /* restore hwif data to pristine status */
273         ide_init_port_data(hwif, hwif->index);
274         spin_unlock_irq(&ide_lock);
275
276         mutex_unlock(&ide_cfg_mtx);
277 }
278
279 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
280 {
281         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
282         hwif->irq = hw->irq;
283         hwif->chipset = hw->chipset;
284         hwif->dev = hw->dev;
285         hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
286         hwif->ack_intr = hw->ack_intr;
287         hwif->config_data = hw->config;
288 }
289
290 /*
291  *      Locks for IDE setting functionality
292  */
293
294 DEFINE_MUTEX(ide_setting_mtx);
295
296 EXPORT_SYMBOL_GPL(ide_setting_mtx);
297
298 /**
299  *      ide_spin_wait_hwgroup   -       wait for group
300  *      @drive: drive in the group
301  *
302  *      Wait for an IDE device group to go non busy and then return
303  *      holding the ide_lock which guards the hwgroup->busy status
304  *      and right to use it.
305  */
306
307 int ide_spin_wait_hwgroup (ide_drive_t *drive)
308 {
309         ide_hwgroup_t *hwgroup = HWGROUP(drive);
310         unsigned long timeout = jiffies + (3 * HZ);
311
312         spin_lock_irq(&ide_lock);
313
314         while (hwgroup->busy) {
315                 unsigned long lflags;
316                 spin_unlock_irq(&ide_lock);
317                 local_irq_set(lflags);
318                 if (time_after(jiffies, timeout)) {
319                         local_irq_restore(lflags);
320                         printk(KERN_ERR "%s: channel busy\n", drive->name);
321                         return -EBUSY;
322                 }
323                 local_irq_restore(lflags);
324                 spin_lock_irq(&ide_lock);
325         }
326         return 0;
327 }
328
329 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
330
331 int set_io_32bit(ide_drive_t *drive, int arg)
332 {
333         if (drive->no_io_32bit)
334                 return -EPERM;
335
336         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
337                 return -EINVAL;
338
339         if (ide_spin_wait_hwgroup(drive))
340                 return -EBUSY;
341
342         drive->io_32bit = arg;
343
344         spin_unlock_irq(&ide_lock);
345
346         return 0;
347 }
348
349 static int set_ksettings(ide_drive_t *drive, int arg)
350 {
351         if (arg < 0 || arg > 1)
352                 return -EINVAL;
353
354         if (ide_spin_wait_hwgroup(drive))
355                 return -EBUSY;
356         drive->keep_settings = arg;
357         spin_unlock_irq(&ide_lock);
358
359         return 0;
360 }
361
362 int set_using_dma(ide_drive_t *drive, int arg)
363 {
364 #ifdef CONFIG_BLK_DEV_IDEDMA
365         ide_hwif_t *hwif = drive->hwif;
366         int err = -EPERM;
367
368         if (arg < 0 || arg > 1)
369                 return -EINVAL;
370
371         if (!drive->id || !(drive->id->capability & 1))
372                 goto out;
373
374         if (hwif->dma_ops == NULL)
375                 goto out;
376
377         err = -EBUSY;
378         if (ide_spin_wait_hwgroup(drive))
379                 goto out;
380         /*
381          * set ->busy flag, unlock and let it ride
382          */
383         hwif->hwgroup->busy = 1;
384         spin_unlock_irq(&ide_lock);
385
386         err = 0;
387
388         if (arg) {
389                 if (ide_set_dma(drive))
390                         err = -EIO;
391         } else
392                 ide_dma_off(drive);
393
394         /*
395          * lock, clear ->busy flag and unlock before leaving
396          */
397         spin_lock_irq(&ide_lock);
398         hwif->hwgroup->busy = 0;
399         spin_unlock_irq(&ide_lock);
400 out:
401         return err;
402 #else
403         if (arg < 0 || arg > 1)
404                 return -EINVAL;
405
406         return -EPERM;
407 #endif
408 }
409
410 int set_pio_mode(ide_drive_t *drive, int arg)
411 {
412         struct request *rq;
413         ide_hwif_t *hwif = drive->hwif;
414         const struct ide_port_ops *port_ops = hwif->port_ops;
415
416         if (arg < 0 || arg > 255)
417                 return -EINVAL;
418
419         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
420             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
421                 return -ENOSYS;
422
423         if (drive->special.b.set_tune)
424                 return -EBUSY;
425
426         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
427         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
428
429         drive->tune_req = (u8) arg;
430         drive->special.b.set_tune = 1;
431
432         blk_execute_rq(drive->queue, NULL, rq, 0);
433         blk_put_request(rq);
434
435         return 0;
436 }
437
438 static int set_unmaskirq(ide_drive_t *drive, int arg)
439 {
440         if (drive->no_unmask)
441                 return -EPERM;
442
443         if (arg < 0 || arg > 1)
444                 return -EINVAL;
445
446         if (ide_spin_wait_hwgroup(drive))
447                 return -EBUSY;
448         drive->unmask = arg;
449         spin_unlock_irq(&ide_lock);
450
451         return 0;
452 }
453
454 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
455 {
456         ide_drive_t *drive = dev->driver_data;
457         ide_hwif_t *hwif = HWIF(drive);
458         struct request *rq;
459         struct request_pm_state rqpm;
460         ide_task_t args;
461         int ret;
462
463         /* Call ACPI _GTM only once */
464         if (!(drive->dn % 2))
465                 ide_acpi_get_timing(hwif);
466
467         memset(&rqpm, 0, sizeof(rqpm));
468         memset(&args, 0, sizeof(args));
469         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
470         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
471         rq->special = &args;
472         rq->data = &rqpm;
473         rqpm.pm_step = ide_pm_state_start_suspend;
474         if (mesg.event == PM_EVENT_PRETHAW)
475                 mesg.event = PM_EVENT_FREEZE;
476         rqpm.pm_state = mesg.event;
477
478         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
479         blk_put_request(rq);
480         /* only call ACPI _PS3 after both drivers are suspended */
481         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
482                  && hwif->drives[1].present)
483                  || !hwif->drives[0].present
484                  || !hwif->drives[1].present))
485                 ide_acpi_set_state(hwif, 0);
486         return ret;
487 }
488
489 static int generic_ide_resume(struct device *dev)
490 {
491         ide_drive_t *drive = dev->driver_data;
492         ide_hwif_t *hwif = HWIF(drive);
493         struct request *rq;
494         struct request_pm_state rqpm;
495         ide_task_t args;
496         int err;
497
498         /* Call ACPI _STM only once */
499         if (!(drive->dn % 2)) {
500                 ide_acpi_set_state(hwif, 1);
501                 ide_acpi_push_timing(hwif);
502         }
503
504         ide_acpi_exec_tfs(drive);
505
506         memset(&rqpm, 0, sizeof(rqpm));
507         memset(&args, 0, sizeof(args));
508         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
509         rq->cmd_type = REQ_TYPE_PM_RESUME;
510         rq->cmd_flags |= REQ_PREEMPT;
511         rq->special = &args;
512         rq->data = &rqpm;
513         rqpm.pm_step = ide_pm_state_start_resume;
514         rqpm.pm_state = PM_EVENT_ON;
515
516         err = blk_execute_rq(drive->queue, NULL, rq, 1);
517         blk_put_request(rq);
518
519         if (err == 0 && dev->driver) {
520                 ide_driver_t *drv = to_ide_driver(dev->driver);
521
522                 if (drv->resume)
523                         drv->resume(drive);
524         }
525
526         return err;
527 }
528
529 static int generic_drive_reset(ide_drive_t *drive)
530 {
531         struct request *rq;
532         int ret = 0;
533
534         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
535         rq->cmd_type = REQ_TYPE_SPECIAL;
536         rq->cmd_len = 1;
537         rq->cmd[0] = REQ_DRIVE_RESET;
538         rq->cmd_flags |= REQ_SOFTBARRIER;
539         if (blk_execute_rq(drive->queue, NULL, rq, 1))
540                 ret = rq->errors;
541         blk_put_request(rq);
542         return ret;
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                         return generic_drive_reset(drive);
620
621                 case HDIO_GET_BUSSTATE:
622                         if (!capable(CAP_SYS_ADMIN))
623                                 return -EACCES;
624                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
625                                 return -EFAULT;
626                         return 0;
627
628                 case HDIO_SET_BUSSTATE:
629                         if (!capable(CAP_SYS_ADMIN))
630                                 return -EACCES;
631                         return -EOPNOTSUPP;
632                 default:
633                         return -EINVAL;
634         }
635
636 read_val:
637         mutex_lock(&ide_setting_mtx);
638         spin_lock_irqsave(&ide_lock, flags);
639         err = *val;
640         spin_unlock_irqrestore(&ide_lock, flags);
641         mutex_unlock(&ide_setting_mtx);
642         return err >= 0 ? put_user(err, (long __user *)arg) : err;
643
644 set_val:
645         if (bdev != bdev->bd_contains)
646                 err = -EINVAL;
647         else {
648                 if (!capable(CAP_SYS_ADMIN))
649                         err = -EACCES;
650                 else {
651                         mutex_lock(&ide_setting_mtx);
652                         err = setfunc(drive, arg);
653                         mutex_unlock(&ide_setting_mtx);
654                 }
655         }
656         return err;
657 }
658
659 EXPORT_SYMBOL(generic_ide_ioctl);
660
661 static int ide_bus_match(struct device *dev, struct device_driver *drv)
662 {
663         return 1;
664 }
665
666 static char *media_string(ide_drive_t *drive)
667 {
668         switch (drive->media) {
669         case ide_disk:
670                 return "disk";
671         case ide_cdrom:
672                 return "cdrom";
673         case ide_tape:
674                 return "tape";
675         case ide_floppy:
676                 return "floppy";
677         case ide_optical:
678                 return "optical";
679         default:
680                 return "UNKNOWN";
681         }
682 }
683
684 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
685 {
686         ide_drive_t *drive = to_ide_device(dev);
687         return sprintf(buf, "%s\n", media_string(drive));
688 }
689
690 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
691 {
692         ide_drive_t *drive = to_ide_device(dev);
693         return sprintf(buf, "%s\n", drive->name);
694 }
695
696 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
697 {
698         ide_drive_t *drive = to_ide_device(dev);
699         return sprintf(buf, "ide:m-%s\n", media_string(drive));
700 }
701
702 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
703                           char *buf)
704 {
705         ide_drive_t *drive = to_ide_device(dev);
706         return sprintf(buf, "%s\n", drive->id->model);
707 }
708
709 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
710                              char *buf)
711 {
712         ide_drive_t *drive = to_ide_device(dev);
713         return sprintf(buf, "%s\n", drive->id->fw_rev);
714 }
715
716 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
717                            char *buf)
718 {
719         ide_drive_t *drive = to_ide_device(dev);
720         return sprintf(buf, "%s\n", drive->id->serial_no);
721 }
722
723 static struct device_attribute ide_dev_attrs[] = {
724         __ATTR_RO(media),
725         __ATTR_RO(drivename),
726         __ATTR_RO(modalias),
727         __ATTR_RO(model),
728         __ATTR_RO(firmware),
729         __ATTR(serial, 0400, serial_show, NULL),
730         __ATTR_NULL
731 };
732
733 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
734 {
735         ide_drive_t *drive = to_ide_device(dev);
736
737         add_uevent_var(env, "MEDIA=%s", media_string(drive));
738         add_uevent_var(env, "DRIVENAME=%s", drive->name);
739         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
740         return 0;
741 }
742
743 static int generic_ide_probe(struct device *dev)
744 {
745         ide_drive_t *drive = to_ide_device(dev);
746         ide_driver_t *drv = to_ide_driver(dev->driver);
747
748         return drv->probe ? drv->probe(drive) : -ENODEV;
749 }
750
751 static int generic_ide_remove(struct device *dev)
752 {
753         ide_drive_t *drive = to_ide_device(dev);
754         ide_driver_t *drv = to_ide_driver(dev->driver);
755
756         if (drv->remove)
757                 drv->remove(drive);
758
759         return 0;
760 }
761
762 static void generic_ide_shutdown(struct device *dev)
763 {
764         ide_drive_t *drive = to_ide_device(dev);
765         ide_driver_t *drv = to_ide_driver(dev->driver);
766
767         if (dev->driver && drv->shutdown)
768                 drv->shutdown(drive);
769 }
770
771 struct bus_type ide_bus_type = {
772         .name           = "ide",
773         .match          = ide_bus_match,
774         .uevent         = ide_uevent,
775         .probe          = generic_ide_probe,
776         .remove         = generic_ide_remove,
777         .shutdown       = generic_ide_shutdown,
778         .dev_attrs      = ide_dev_attrs,
779         .suspend        = generic_ide_suspend,
780         .resume         = generic_ide_resume,
781 };
782
783 EXPORT_SYMBOL_GPL(ide_bus_type);
784
785 int ide_vlb_clk;
786 EXPORT_SYMBOL_GPL(ide_vlb_clk);
787
788 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
789 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
790
791 int ide_pci_clk;
792 EXPORT_SYMBOL_GPL(ide_pci_clk);
793
794 module_param_named(pci_clock, ide_pci_clk, int, 0);
795 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
796
797 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
798 {
799         int a, b, i, j = 1;
800         unsigned int *dev_param_mask = (unsigned int *)kp->arg;
801
802         if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
803             sscanf(s, "%d.%d", &a, &b) != 2)
804                 return -EINVAL;
805
806         i = a * MAX_DRIVES + b;
807
808         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
809                 return -EINVAL;
810
811         if (j)
812                 *dev_param_mask |= (1 << i);
813         else
814                 *dev_param_mask &= (1 << i);
815
816         return 0;
817 }
818
819 static unsigned int ide_nodma;
820
821 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
822 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
823
824 static unsigned int ide_noflush;
825
826 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
827 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
828
829 static unsigned int ide_noprobe;
830
831 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
832 MODULE_PARM_DESC(noprobe, "skip probing for a device");
833
834 static unsigned int ide_nowerr;
835
836 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
837 MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device");
838
839 static unsigned int ide_cdroms;
840
841 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
842 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
843
844 struct chs_geom {
845         unsigned int    cyl;
846         u8              head;
847         u8              sect;
848 };
849
850 static unsigned int ide_disks;
851 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
852
853 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
854 {
855         int a, b, c = 0, h = 0, s = 0, i, j = 1;
856
857         if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
858             sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
859                 return -EINVAL;
860
861         i = a * MAX_DRIVES + b;
862
863         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
864                 return -EINVAL;
865
866         if (c > INT_MAX || h > 255 || s > 255)
867                 return -EINVAL;
868
869         if (j)
870                 ide_disks |= (1 << i);
871         else
872                 ide_disks &= (1 << i);
873
874         ide_disks_chs[i].cyl  = c;
875         ide_disks_chs[i].head = h;
876         ide_disks_chs[i].sect = s;
877
878         return 0;
879 }
880
881 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
882 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
883
884 static void ide_dev_apply_params(ide_drive_t *drive)
885 {
886         int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
887
888         if (ide_nodma & (1 << i)) {
889                 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
890                 drive->nodma = 1;
891         }
892         if (ide_noflush & (1 << i)) {
893                 printk(KERN_INFO "ide: disabling flush requests for %s\n",
894                                  drive->name);
895                 drive->noflush = 1;
896         }
897         if (ide_noprobe & (1 << i)) {
898                 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
899                 drive->noprobe = 1;
900         }
901         if (ide_nowerr & (1 << i)) {
902                 printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n",
903                                  drive->name);
904                 drive->bad_wstat = BAD_R_STAT;
905         }
906         if (ide_cdroms & (1 << i)) {
907                 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
908                 drive->present = 1;
909                 drive->media = ide_cdrom;
910                 /* an ATAPI device ignores DRDY */
911                 drive->ready_stat = 0;
912         }
913         if (ide_disks & (1 << i)) {
914                 drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
915                 drive->head = drive->bios_head = ide_disks_chs[i].head;
916                 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
917                 drive->forced_geom = 1;
918                 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
919                                  drive->name,
920                                  drive->cyl, drive->head, drive->sect);
921                 drive->present = 1;
922                 drive->media = ide_disk;
923                 drive->ready_stat = READY_STAT;
924         }
925 }
926
927 static unsigned int ide_ignore_cable;
928
929 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
930 {
931         int i, j = 1;
932
933         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
934                 return -EINVAL;
935
936         if (i >= MAX_HWIFS || j < 0 || j > 1)
937                 return -EINVAL;
938
939         if (j)
940                 ide_ignore_cable |= (1 << i);
941         else
942                 ide_ignore_cable &= (1 << i);
943
944         return 0;
945 }
946
947 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
948 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
949
950 void ide_port_apply_params(ide_hwif_t *hwif)
951 {
952         int i;
953
954         if (ide_ignore_cable & (1 << hwif->index)) {
955                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
956                                  hwif->name);
957                 hwif->cbl = ATA_CBL_PATA40_SHORT;
958         }
959
960         for (i = 0; i < MAX_DRIVES; i++)
961                 ide_dev_apply_params(&hwif->drives[i]);
962 }
963
964 /*
965  * This is gets invoked once during initialization, to set *everything* up
966  */
967 static int __init ide_init(void)
968 {
969         int ret;
970
971         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
972
973         ret = bus_register(&ide_bus_type);
974         if (ret < 0) {
975                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
976                 return ret;
977         }
978
979         ide_port_class = class_create(THIS_MODULE, "ide_port");
980         if (IS_ERR(ide_port_class)) {
981                 ret = PTR_ERR(ide_port_class);
982                 goto out_port_class;
983         }
984
985         proc_ide_create();
986
987         return 0;
988
989 out_port_class:
990         bus_unregister(&ide_bus_type);
991
992         return ret;
993 }
994
995 static void __exit ide_exit(void)
996 {
997         proc_ide_destroy();
998
999         class_destroy(ide_port_class);
1000
1001         bus_unregister(&ide_bus_type);
1002 }
1003
1004 module_init(ide_init);
1005 module_exit(ide_exit);
1006
1007 MODULE_LICENSE("GPL");