ide: add struct ide_tp_ops (take 2)
[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/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 EXPORT_SYMBOL(ide_unregister);
280
281 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
282 {
283         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
284         hwif->irq = hw->irq;
285         hwif->chipset = hw->chipset;
286         hwif->dev = hw->dev;
287         hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
288         hwif->ack_intr = hw->ack_intr;
289         hwif->config_data = hw->config;
290 }
291
292 /*
293  *      Locks for IDE setting functionality
294  */
295
296 DEFINE_MUTEX(ide_setting_mtx);
297
298 EXPORT_SYMBOL_GPL(ide_setting_mtx);
299
300 /**
301  *      ide_spin_wait_hwgroup   -       wait for group
302  *      @drive: drive in the group
303  *
304  *      Wait for an IDE device group to go non busy and then return
305  *      holding the ide_lock which guards the hwgroup->busy status
306  *      and right to use it.
307  */
308
309 int ide_spin_wait_hwgroup (ide_drive_t *drive)
310 {
311         ide_hwgroup_t *hwgroup = HWGROUP(drive);
312         unsigned long timeout = jiffies + (3 * HZ);
313
314         spin_lock_irq(&ide_lock);
315
316         while (hwgroup->busy) {
317                 unsigned long lflags;
318                 spin_unlock_irq(&ide_lock);
319                 local_irq_set(lflags);
320                 if (time_after(jiffies, timeout)) {
321                         local_irq_restore(lflags);
322                         printk(KERN_ERR "%s: channel busy\n", drive->name);
323                         return -EBUSY;
324                 }
325                 local_irq_restore(lflags);
326                 spin_lock_irq(&ide_lock);
327         }
328         return 0;
329 }
330
331 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
332
333 int set_io_32bit(ide_drive_t *drive, int arg)
334 {
335         if (drive->no_io_32bit)
336                 return -EPERM;
337
338         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
339                 return -EINVAL;
340
341         if (ide_spin_wait_hwgroup(drive))
342                 return -EBUSY;
343
344         drive->io_32bit = arg;
345
346         spin_unlock_irq(&ide_lock);
347
348         return 0;
349 }
350
351 static int set_ksettings(ide_drive_t *drive, int arg)
352 {
353         if (arg < 0 || arg > 1)
354                 return -EINVAL;
355
356         if (ide_spin_wait_hwgroup(drive))
357                 return -EBUSY;
358         drive->keep_settings = arg;
359         spin_unlock_irq(&ide_lock);
360
361         return 0;
362 }
363
364 int set_using_dma(ide_drive_t *drive, int arg)
365 {
366 #ifdef CONFIG_BLK_DEV_IDEDMA
367         ide_hwif_t *hwif = drive->hwif;
368         int err = -EPERM;
369
370         if (arg < 0 || arg > 1)
371                 return -EINVAL;
372
373         if (!drive->id || !(drive->id->capability & 1))
374                 goto out;
375
376         if (hwif->dma_ops == NULL)
377                 goto out;
378
379         err = -EBUSY;
380         if (ide_spin_wait_hwgroup(drive))
381                 goto out;
382         /*
383          * set ->busy flag, unlock and let it ride
384          */
385         hwif->hwgroup->busy = 1;
386         spin_unlock_irq(&ide_lock);
387
388         err = 0;
389
390         if (arg) {
391                 if (ide_set_dma(drive))
392                         err = -EIO;
393         } else
394                 ide_dma_off(drive);
395
396         /*
397          * lock, clear ->busy flag and unlock before leaving
398          */
399         spin_lock_irq(&ide_lock);
400         hwif->hwgroup->busy = 0;
401         spin_unlock_irq(&ide_lock);
402 out:
403         return err;
404 #else
405         if (arg < 0 || arg > 1)
406                 return -EINVAL;
407
408         return -EPERM;
409 #endif
410 }
411
412 int set_pio_mode(ide_drive_t *drive, int arg)
413 {
414         struct request *rq;
415         ide_hwif_t *hwif = drive->hwif;
416         const struct ide_port_ops *port_ops = hwif->port_ops;
417
418         if (arg < 0 || arg > 255)
419                 return -EINVAL;
420
421         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
422             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
423                 return -ENOSYS;
424
425         if (drive->special.b.set_tune)
426                 return -EBUSY;
427
428         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
429         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
430
431         drive->tune_req = (u8) arg;
432         drive->special.b.set_tune = 1;
433
434         blk_execute_rq(drive->queue, NULL, rq, 0);
435         blk_put_request(rq);
436
437         return 0;
438 }
439
440 static int set_unmaskirq(ide_drive_t *drive, int arg)
441 {
442         if (drive->no_unmask)
443                 return -EPERM;
444
445         if (arg < 0 || arg > 1)
446                 return -EINVAL;
447
448         if (ide_spin_wait_hwgroup(drive))
449                 return -EBUSY;
450         drive->unmask = arg;
451         spin_unlock_irq(&ide_lock);
452
453         return 0;
454 }
455
456 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
457 {
458         ide_drive_t *drive = dev->driver_data;
459         ide_hwif_t *hwif = HWIF(drive);
460         struct request *rq;
461         struct request_pm_state rqpm;
462         ide_task_t args;
463         int ret;
464
465         /* Call ACPI _GTM only once */
466         if (!(drive->dn % 2))
467                 ide_acpi_get_timing(hwif);
468
469         memset(&rqpm, 0, sizeof(rqpm));
470         memset(&args, 0, sizeof(args));
471         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
472         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
473         rq->special = &args;
474         rq->data = &rqpm;
475         rqpm.pm_step = ide_pm_state_start_suspend;
476         if (mesg.event == PM_EVENT_PRETHAW)
477                 mesg.event = PM_EVENT_FREEZE;
478         rqpm.pm_state = mesg.event;
479
480         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
481         blk_put_request(rq);
482         /* only call ACPI _PS3 after both drivers are suspended */
483         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
484                  && hwif->drives[1].present)
485                  || !hwif->drives[0].present
486                  || !hwif->drives[1].present))
487                 ide_acpi_set_state(hwif, 0);
488         return ret;
489 }
490
491 static int generic_ide_resume(struct device *dev)
492 {
493         ide_drive_t *drive = dev->driver_data;
494         ide_hwif_t *hwif = HWIF(drive);
495         struct request *rq;
496         struct request_pm_state rqpm;
497         ide_task_t args;
498         int err;
499
500         /* Call ACPI _STM only once */
501         if (!(drive->dn % 2)) {
502                 ide_acpi_set_state(hwif, 1);
503                 ide_acpi_push_timing(hwif);
504         }
505
506         ide_acpi_exec_tfs(drive);
507
508         memset(&rqpm, 0, sizeof(rqpm));
509         memset(&args, 0, sizeof(args));
510         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
511         rq->cmd_type = REQ_TYPE_PM_RESUME;
512         rq->cmd_flags |= REQ_PREEMPT;
513         rq->special = &args;
514         rq->data = &rqpm;
515         rqpm.pm_step = ide_pm_state_start_resume;
516         rqpm.pm_state = PM_EVENT_ON;
517
518         err = blk_execute_rq(drive->queue, NULL, rq, 1);
519         blk_put_request(rq);
520
521         if (err == 0 && dev->driver) {
522                 ide_driver_t *drv = to_ide_driver(dev->driver);
523
524                 if (drv->resume)
525                         drv->resume(drive);
526         }
527
528         return err;
529 }
530
531 static int generic_drive_reset(ide_drive_t *drive)
532 {
533         struct request *rq;
534         int ret = 0;
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         if (blk_execute_rq(drive->queue, NULL, rq, 1))
542                 ret = rq->errors;
543         blk_put_request(rq);
544         return ret;
545 }
546
547 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
548                         unsigned int cmd, unsigned long arg)
549 {
550         unsigned long flags;
551         ide_driver_t *drv;
552         void __user *p = (void __user *)arg;
553         int err = 0, (*setfunc)(ide_drive_t *, int);
554         u8 *val;
555
556         switch (cmd) {
557         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
558         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
559         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
560         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
561         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
562         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
563         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
564         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
565         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
566         }
567
568         switch (cmd) {
569                 case HDIO_OBSOLETE_IDENTITY:
570                 case HDIO_GET_IDENTITY:
571                         if (bdev != bdev->bd_contains)
572                                 return -EINVAL;
573                         if (drive->id_read == 0)
574                                 return -ENOMSG;
575                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
576                                 return -EFAULT;
577                         return 0;
578
579                 case HDIO_GET_NICE:
580                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
581                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
582                                         drive->nice1 << IDE_NICE_1,
583                                         (long __user *) arg);
584 #ifdef CONFIG_IDE_TASK_IOCTL
585                 case HDIO_DRIVE_TASKFILE:
586                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
587                                 return -EACCES;
588                         switch(drive->media) {
589                                 case ide_disk:
590                                         return ide_taskfile_ioctl(drive, cmd, arg);
591                                 default:
592                                         return -ENOMSG;
593                         }
594 #endif /* CONFIG_IDE_TASK_IOCTL */
595
596                 case HDIO_DRIVE_CMD:
597                         if (!capable(CAP_SYS_RAWIO))
598                                 return -EACCES;
599                         return ide_cmd_ioctl(drive, cmd, arg);
600
601                 case HDIO_DRIVE_TASK:
602                         if (!capable(CAP_SYS_RAWIO))
603                                 return -EACCES;
604                         return ide_task_ioctl(drive, cmd, arg);
605                 case HDIO_SET_NICE:
606                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
607                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
608                                 return -EPERM;
609                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
610                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
611                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
612                                 drive->dsc_overlap = 0;
613                                 return -EPERM;
614                         }
615                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
616                         return 0;
617                 case HDIO_DRIVE_RESET:
618                         if (!capable(CAP_SYS_ADMIN))
619                                 return -EACCES;
620
621                         return generic_drive_reset(drive);
622
623                 case HDIO_GET_BUSSTATE:
624                         if (!capable(CAP_SYS_ADMIN))
625                                 return -EACCES;
626                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
627                                 return -EFAULT;
628                         return 0;
629
630                 case HDIO_SET_BUSSTATE:
631                         if (!capable(CAP_SYS_ADMIN))
632                                 return -EACCES;
633                         return -EOPNOTSUPP;
634                 default:
635                         return -EINVAL;
636         }
637
638 read_val:
639         mutex_lock(&ide_setting_mtx);
640         spin_lock_irqsave(&ide_lock, flags);
641         err = *val;
642         spin_unlock_irqrestore(&ide_lock, flags);
643         mutex_unlock(&ide_setting_mtx);
644         return err >= 0 ? put_user(err, (long __user *)arg) : err;
645
646 set_val:
647         if (bdev != bdev->bd_contains)
648                 err = -EINVAL;
649         else {
650                 if (!capable(CAP_SYS_ADMIN))
651                         err = -EACCES;
652                 else {
653                         mutex_lock(&ide_setting_mtx);
654                         err = setfunc(drive, arg);
655                         mutex_unlock(&ide_setting_mtx);
656                 }
657         }
658         return err;
659 }
660
661 EXPORT_SYMBOL(generic_ide_ioctl);
662
663 static int ide_bus_match(struct device *dev, struct device_driver *drv)
664 {
665         return 1;
666 }
667
668 static char *media_string(ide_drive_t *drive)
669 {
670         switch (drive->media) {
671         case ide_disk:
672                 return "disk";
673         case ide_cdrom:
674                 return "cdrom";
675         case ide_tape:
676                 return "tape";
677         case ide_floppy:
678                 return "floppy";
679         case ide_optical:
680                 return "optical";
681         default:
682                 return "UNKNOWN";
683         }
684 }
685
686 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
687 {
688         ide_drive_t *drive = to_ide_device(dev);
689         return sprintf(buf, "%s\n", media_string(drive));
690 }
691
692 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
693 {
694         ide_drive_t *drive = to_ide_device(dev);
695         return sprintf(buf, "%s\n", drive->name);
696 }
697
698 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
699 {
700         ide_drive_t *drive = to_ide_device(dev);
701         return sprintf(buf, "ide:m-%s\n", media_string(drive));
702 }
703
704 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
705                           char *buf)
706 {
707         ide_drive_t *drive = to_ide_device(dev);
708         return sprintf(buf, "%s\n", drive->id->model);
709 }
710
711 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
712                              char *buf)
713 {
714         ide_drive_t *drive = to_ide_device(dev);
715         return sprintf(buf, "%s\n", drive->id->fw_rev);
716 }
717
718 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
719                            char *buf)
720 {
721         ide_drive_t *drive = to_ide_device(dev);
722         return sprintf(buf, "%s\n", drive->id->serial_no);
723 }
724
725 static struct device_attribute ide_dev_attrs[] = {
726         __ATTR_RO(media),
727         __ATTR_RO(drivename),
728         __ATTR_RO(modalias),
729         __ATTR_RO(model),
730         __ATTR_RO(firmware),
731         __ATTR(serial, 0400, serial_show, NULL),
732         __ATTR_NULL
733 };
734
735 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
736 {
737         ide_drive_t *drive = to_ide_device(dev);
738
739         add_uevent_var(env, "MEDIA=%s", media_string(drive));
740         add_uevent_var(env, "DRIVENAME=%s", drive->name);
741         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
742         return 0;
743 }
744
745 static int generic_ide_probe(struct device *dev)
746 {
747         ide_drive_t *drive = to_ide_device(dev);
748         ide_driver_t *drv = to_ide_driver(dev->driver);
749
750         return drv->probe ? drv->probe(drive) : -ENODEV;
751 }
752
753 static int generic_ide_remove(struct device *dev)
754 {
755         ide_drive_t *drive = to_ide_device(dev);
756         ide_driver_t *drv = to_ide_driver(dev->driver);
757
758         if (drv->remove)
759                 drv->remove(drive);
760
761         return 0;
762 }
763
764 static void generic_ide_shutdown(struct device *dev)
765 {
766         ide_drive_t *drive = to_ide_device(dev);
767         ide_driver_t *drv = to_ide_driver(dev->driver);
768
769         if (dev->driver && drv->shutdown)
770                 drv->shutdown(drive);
771 }
772
773 struct bus_type ide_bus_type = {
774         .name           = "ide",
775         .match          = ide_bus_match,
776         .uevent         = ide_uevent,
777         .probe          = generic_ide_probe,
778         .remove         = generic_ide_remove,
779         .shutdown       = generic_ide_shutdown,
780         .dev_attrs      = ide_dev_attrs,
781         .suspend        = generic_ide_suspend,
782         .resume         = generic_ide_resume,
783 };
784
785 EXPORT_SYMBOL_GPL(ide_bus_type);
786
787 int ide_vlb_clk;
788 EXPORT_SYMBOL_GPL(ide_vlb_clk);
789
790 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
791 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
792
793 int ide_pci_clk;
794 EXPORT_SYMBOL_GPL(ide_pci_clk);
795
796 module_param_named(pci_clock, ide_pci_clk, int, 0);
797 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
798
799 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
800 {
801         int a, b, i, j = 1;
802         unsigned int *dev_param_mask = (unsigned int *)kp->arg;
803
804         if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
805             sscanf(s, "%d.%d", &a, &b) != 2)
806                 return -EINVAL;
807
808         i = a * MAX_DRIVES + b;
809
810         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
811                 return -EINVAL;
812
813         if (j)
814                 *dev_param_mask |= (1 << i);
815         else
816                 *dev_param_mask &= (1 << i);
817
818         return 0;
819 }
820
821 static unsigned int ide_nodma;
822
823 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
824 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
825
826 static unsigned int ide_noflush;
827
828 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
829 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
830
831 static unsigned int ide_noprobe;
832
833 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
834 MODULE_PARM_DESC(noprobe, "skip probing for a device");
835
836 static unsigned int ide_nowerr;
837
838 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
839 MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device");
840
841 static unsigned int ide_cdroms;
842
843 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
844 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
845
846 struct chs_geom {
847         unsigned int    cyl;
848         u8              head;
849         u8              sect;
850 };
851
852 static unsigned int ide_disks;
853 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
854
855 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
856 {
857         int a, b, c = 0, h = 0, s = 0, i, j = 1;
858
859         if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
860             sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
861                 return -EINVAL;
862
863         i = a * MAX_DRIVES + b;
864
865         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
866                 return -EINVAL;
867
868         if (c > INT_MAX || h > 255 || s > 255)
869                 return -EINVAL;
870
871         if (j)
872                 ide_disks |= (1 << i);
873         else
874                 ide_disks &= (1 << i);
875
876         ide_disks_chs[i].cyl  = c;
877         ide_disks_chs[i].head = h;
878         ide_disks_chs[i].sect = s;
879
880         return 0;
881 }
882
883 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
884 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
885
886 static void ide_dev_apply_params(ide_drive_t *drive)
887 {
888         int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
889
890         if (ide_nodma & (1 << i)) {
891                 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
892                 drive->nodma = 1;
893         }
894         if (ide_noflush & (1 << i)) {
895                 printk(KERN_INFO "ide: disabling flush requests for %s\n",
896                                  drive->name);
897                 drive->noflush = 1;
898         }
899         if (ide_noprobe & (1 << i)) {
900                 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
901                 drive->noprobe = 1;
902         }
903         if (ide_nowerr & (1 << i)) {
904                 printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n",
905                                  drive->name);
906                 drive->bad_wstat = BAD_R_STAT;
907         }
908         if (ide_cdroms & (1 << i)) {
909                 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
910                 drive->present = 1;
911                 drive->media = ide_cdrom;
912                 /* an ATAPI device ignores DRDY */
913                 drive->ready_stat = 0;
914         }
915         if (ide_disks & (1 << i)) {
916                 drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
917                 drive->head = drive->bios_head = ide_disks_chs[i].head;
918                 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
919                 drive->forced_geom = 1;
920                 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
921                                  drive->name,
922                                  drive->cyl, drive->head, drive->sect);
923                 drive->present = 1;
924                 drive->media = ide_disk;
925                 drive->ready_stat = READY_STAT;
926         }
927 }
928
929 static unsigned int ide_ignore_cable;
930
931 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
932 {
933         int i, j = 1;
934
935         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
936                 return -EINVAL;
937
938         if (i >= MAX_HWIFS || j < 0 || j > 1)
939                 return -EINVAL;
940
941         if (j)
942                 ide_ignore_cable |= (1 << i);
943         else
944                 ide_ignore_cable &= (1 << i);
945
946         return 0;
947 }
948
949 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
950 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
951
952 void ide_port_apply_params(ide_hwif_t *hwif)
953 {
954         int i;
955
956         if (ide_ignore_cable & (1 << hwif->index)) {
957                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
958                                  hwif->name);
959                 hwif->cbl = ATA_CBL_PATA40_SHORT;
960         }
961
962         for (i = 0; i < MAX_DRIVES; i++)
963                 ide_dev_apply_params(&hwif->drives[i]);
964 }
965
966 /*
967  * This is gets invoked once during initialization, to set *everything* up
968  */
969 static int __init ide_init(void)
970 {
971         int ret;
972
973         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
974
975         ret = bus_register(&ide_bus_type);
976         if (ret < 0) {
977                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
978                 return ret;
979         }
980
981         ide_port_class = class_create(THIS_MODULE, "ide_port");
982         if (IS_ERR(ide_port_class)) {
983                 ret = PTR_ERR(ide_port_class);
984                 goto out_port_class;
985         }
986
987         proc_ide_create();
988
989         return 0;
990
991 out_port_class:
992         bus_unregister(&ide_bus_type);
993
994         return ret;
995 }
996
997 static void __exit ide_exit(void)
998 {
999         proc_ide_destroy();
1000
1001         class_destroy(ide_port_class);
1002
1003         bus_unregister(&ide_bus_type);
1004 }
1005
1006 module_init(ide_init);
1007 module_exit(ide_exit);
1008
1009 MODULE_LICENSE("GPL");