ide: /proc/ide/hd*/settings rework
[linux-3.10.git] / drivers / ide / ide.c
1 /*
2  *  Copyright (C) 1994-1998         Linus Torvalds & authors (see below)
3  *  Copyright (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 #include <linux/module.h>
48 #include <linux/types.h>
49 #include <linux/string.h>
50 #include <linux/kernel.h>
51 #include <linux/interrupt.h>
52 #include <linux/major.h>
53 #include <linux/errno.h>
54 #include <linux/genhd.h>
55 #include <linux/slab.h>
56 #include <linux/init.h>
57 #include <linux/pci.h>
58 #include <linux/ide.h>
59 #include <linux/hdreg.h>
60 #include <linux/completion.h>
61 #include <linux/device.h>
62
63
64 /* default maximum number of failures */
65 #define IDE_DEFAULT_MAX_FAILURES        1
66
67 struct class *ide_port_class;
68
69 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
70                                         IDE2_MAJOR, IDE3_MAJOR,
71                                         IDE4_MAJOR, IDE5_MAJOR,
72                                         IDE6_MAJOR, IDE7_MAJOR,
73                                         IDE8_MAJOR, IDE9_MAJOR };
74
75 DEFINE_MUTEX(ide_cfg_mtx);
76
77 __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
78 EXPORT_SYMBOL(ide_lock);
79
80 static void ide_port_init_devices_data(ide_hwif_t *);
81
82 /*
83  * Do not even *think* about calling this!
84  */
85 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
86 {
87         /* bulk initialize hwif & drive info with zeros */
88         memset(hwif, 0, sizeof(ide_hwif_t));
89
90         /* fill in any non-zero initial values */
91         hwif->index     = index;
92         hwif->major     = ide_hwif_to_major[index];
93
94         hwif->name[0]   = 'i';
95         hwif->name[1]   = 'd';
96         hwif->name[2]   = 'e';
97         hwif->name[3]   = '0' + index;
98
99         hwif->bus_state = BUSSTATE_ON;
100
101         init_completion(&hwif->gendev_rel_comp);
102
103         hwif->tp_ops = &default_tp_ops;
104
105         ide_port_init_devices_data(hwif);
106 }
107
108 static void ide_port_init_devices_data(ide_hwif_t *hwif)
109 {
110         int unit;
111
112         for (unit = 0; unit < MAX_DRIVES; ++unit) {
113                 ide_drive_t *drive = &hwif->drives[unit];
114                 u8 j = (hwif->index * MAX_DRIVES) + unit;
115
116                 memset(drive, 0, sizeof(*drive));
117
118                 drive->media                    = ide_disk;
119                 drive->select.all               = (unit<<4)|0xa0;
120                 drive->hwif                     = hwif;
121                 drive->ready_stat               = ATA_DRDY;
122                 drive->bad_wstat                = BAD_W_STAT;
123                 drive->special.b.recalibrate    = 1;
124                 drive->special.b.set_geometry   = 1;
125                 drive->name[0]                  = 'h';
126                 drive->name[1]                  = 'd';
127                 drive->name[2]                  = 'a' + j;
128                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
129
130                 INIT_LIST_HEAD(&drive->list);
131                 init_completion(&drive->gendev_rel_comp);
132         }
133 }
134
135 /* Called with ide_lock held. */
136 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
137 {
138         int i;
139
140         for (i = 0; i < MAX_DRIVES; i++) {
141                 ide_drive_t *drive = &hwif->drives[i];
142
143                 if (drive->present) {
144                         spin_unlock_irq(&ide_lock);
145                         device_unregister(&drive->gendev);
146                         wait_for_completion(&drive->gendev_rel_comp);
147                         spin_lock_irq(&ide_lock);
148                 }
149         }
150 }
151
152 void ide_port_unregister_devices(ide_hwif_t *hwif)
153 {
154         mutex_lock(&ide_cfg_mtx);
155         spin_lock_irq(&ide_lock);
156         __ide_port_unregister_devices(hwif);
157         hwif->present = 0;
158         ide_port_init_devices_data(hwif);
159         spin_unlock_irq(&ide_lock);
160         mutex_unlock(&ide_cfg_mtx);
161 }
162 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
163
164 /**
165  *      ide_unregister          -       free an IDE interface
166  *      @hwif: IDE interface
167  *
168  *      Perform the final unregister of an IDE interface. At the moment
169  *      we don't refcount interfaces so this will also get split up.
170  *
171  *      Locking:
172  *      The caller must not hold the IDE locks
173  *      The drive present/vanishing is not yet properly locked
174  *      Take care with the callbacks. These have been split to avoid
175  *      deadlocking the IDE layer. The shutdown callback is called
176  *      before we take the lock and free resources. It is up to the
177  *      caller to be sure there is no pending I/O here, and that
178  *      the interface will not be reopened (present/vanishing locking
179  *      isn't yet done BTW). After we commit to the final kill we
180  *      call the cleanup callback with the ide locks held.
181  *
182  *      Unregister restores the hwif structures to the default state.
183  *      This is raving bonkers.
184  */
185
186 void ide_unregister(ide_hwif_t *hwif)
187 {
188         ide_hwif_t *g;
189         ide_hwgroup_t *hwgroup;
190         int irq_count = 0;
191
192         BUG_ON(in_interrupt());
193         BUG_ON(irqs_disabled());
194
195         mutex_lock(&ide_cfg_mtx);
196
197         spin_lock_irq(&ide_lock);
198         if (hwif->present) {
199                 __ide_port_unregister_devices(hwif);
200                 hwif->present = 0;
201         }
202         spin_unlock_irq(&ide_lock);
203
204         ide_proc_unregister_port(hwif);
205
206         hwgroup = hwif->hwgroup;
207         /*
208          * free the irq if we were the only hwif using it
209          */
210         g = hwgroup->hwif;
211         do {
212                 if (g->irq == hwif->irq)
213                         ++irq_count;
214                 g = g->next;
215         } while (g != hwgroup->hwif);
216         if (irq_count == 1)
217                 free_irq(hwif->irq, hwgroup);
218
219         ide_remove_port_from_hwgroup(hwif);
220
221         device_unregister(hwif->portdev);
222         device_unregister(&hwif->gendev);
223         wait_for_completion(&hwif->gendev_rel_comp);
224
225         /*
226          * Remove us from the kernel's knowledge
227          */
228         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
229         kfree(hwif->sg_table);
230         unregister_blkdev(hwif->major, hwif->name);
231
232         if (hwif->dma_base)
233                 ide_release_dma_engine(hwif);
234
235         mutex_unlock(&ide_cfg_mtx);
236 }
237
238 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
239 {
240         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
241         hwif->irq = hw->irq;
242         hwif->chipset = hw->chipset;
243         hwif->dev = hw->dev;
244         hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
245         hwif->ack_intr = hw->ack_intr;
246         hwif->config_data = hw->config;
247 }
248
249 /*
250  *      Locks for IDE setting functionality
251  */
252
253 DEFINE_MUTEX(ide_setting_mtx);
254
255 EXPORT_SYMBOL_GPL(ide_setting_mtx);
256
257 /**
258  *      ide_spin_wait_hwgroup   -       wait for group
259  *      @drive: drive in the group
260  *
261  *      Wait for an IDE device group to go non busy and then return
262  *      holding the ide_lock which guards the hwgroup->busy status
263  *      and right to use it.
264  */
265
266 int ide_spin_wait_hwgroup (ide_drive_t *drive)
267 {
268         ide_hwgroup_t *hwgroup = HWGROUP(drive);
269         unsigned long timeout = jiffies + (3 * HZ);
270
271         spin_lock_irq(&ide_lock);
272
273         while (hwgroup->busy) {
274                 unsigned long lflags;
275                 spin_unlock_irq(&ide_lock);
276                 local_irq_set(lflags);
277                 if (time_after(jiffies, timeout)) {
278                         local_irq_restore(lflags);
279                         printk(KERN_ERR "%s: channel busy\n", drive->name);
280                         return -EBUSY;
281                 }
282                 local_irq_restore(lflags);
283                 spin_lock_irq(&ide_lock);
284         }
285         return 0;
286 }
287
288 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
289
290 ide_devset_get(io_32bit, io_32bit);
291
292 int set_io_32bit(ide_drive_t *drive, int arg)
293 {
294         if (drive->no_io_32bit)
295                 return -EPERM;
296
297         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
298                 return -EINVAL;
299
300         if (ide_spin_wait_hwgroup(drive))
301                 return -EBUSY;
302
303         drive->io_32bit = arg;
304
305         spin_unlock_irq(&ide_lock);
306
307         return 0;
308 }
309
310 ide_devset_get(ksettings, keep_settings);
311
312 int set_ksettings(ide_drive_t *drive, int arg)
313 {
314         if (arg < 0 || arg > 1)
315                 return -EINVAL;
316
317         if (ide_spin_wait_hwgroup(drive))
318                 return -EBUSY;
319         drive->keep_settings = arg;
320         spin_unlock_irq(&ide_lock);
321
322         return 0;
323 }
324
325 ide_devset_get(using_dma, using_dma);
326
327 int set_using_dma(ide_drive_t *drive, int arg)
328 {
329 #ifdef CONFIG_BLK_DEV_IDEDMA
330         ide_hwif_t *hwif = drive->hwif;
331         int err = -EPERM;
332
333         if (arg < 0 || arg > 1)
334                 return -EINVAL;
335
336         if (ata_id_has_dma(drive->id) == 0)
337                 goto out;
338
339         if (hwif->dma_ops == NULL)
340                 goto out;
341
342         err = -EBUSY;
343         if (ide_spin_wait_hwgroup(drive))
344                 goto out;
345         /*
346          * set ->busy flag, unlock and let it ride
347          */
348         hwif->hwgroup->busy = 1;
349         spin_unlock_irq(&ide_lock);
350
351         err = 0;
352
353         if (arg) {
354                 if (ide_set_dma(drive))
355                         err = -EIO;
356         } else
357                 ide_dma_off(drive);
358
359         /*
360          * lock, clear ->busy flag and unlock before leaving
361          */
362         spin_lock_irq(&ide_lock);
363         hwif->hwgroup->busy = 0;
364         spin_unlock_irq(&ide_lock);
365 out:
366         return err;
367 #else
368         if (arg < 0 || arg > 1)
369                 return -EINVAL;
370
371         return -EPERM;
372 #endif
373 }
374
375 int set_pio_mode(ide_drive_t *drive, int arg)
376 {
377         struct request *rq;
378         ide_hwif_t *hwif = drive->hwif;
379         const struct ide_port_ops *port_ops = hwif->port_ops;
380
381         if (arg < 0 || arg > 255)
382                 return -EINVAL;
383
384         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
385             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
386                 return -ENOSYS;
387
388         if (drive->special.b.set_tune)
389                 return -EBUSY;
390
391         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
392         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
393
394         drive->tune_req = (u8) arg;
395         drive->special.b.set_tune = 1;
396
397         blk_execute_rq(drive->queue, NULL, rq, 0);
398         blk_put_request(rq);
399
400         return 0;
401 }
402
403 ide_devset_get(unmaskirq, unmask);
404
405 int set_unmaskirq(ide_drive_t *drive, int arg)
406 {
407         if (drive->no_unmask)
408                 return -EPERM;
409
410         if (arg < 0 || arg > 1)
411                 return -EINVAL;
412
413         if (ide_spin_wait_hwgroup(drive))
414                 return -EBUSY;
415         drive->unmask = arg;
416         spin_unlock_irq(&ide_lock);
417
418         return 0;
419 }
420
421 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
422 {
423         ide_drive_t *drive = dev->driver_data;
424         ide_hwif_t *hwif = HWIF(drive);
425         struct request *rq;
426         struct request_pm_state rqpm;
427         ide_task_t args;
428         int ret;
429
430         /* Call ACPI _GTM only once */
431         if (!(drive->dn % 2))
432                 ide_acpi_get_timing(hwif);
433
434         memset(&rqpm, 0, sizeof(rqpm));
435         memset(&args, 0, sizeof(args));
436         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
437         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
438         rq->special = &args;
439         rq->data = &rqpm;
440         rqpm.pm_step = ide_pm_state_start_suspend;
441         if (mesg.event == PM_EVENT_PRETHAW)
442                 mesg.event = PM_EVENT_FREEZE;
443         rqpm.pm_state = mesg.event;
444
445         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
446         blk_put_request(rq);
447         /* only call ACPI _PS3 after both drivers are suspended */
448         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
449                  && hwif->drives[1].present)
450                  || !hwif->drives[0].present
451                  || !hwif->drives[1].present))
452                 ide_acpi_set_state(hwif, 0);
453         return ret;
454 }
455
456 static int generic_ide_resume(struct device *dev)
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 err;
464
465         /* Call ACPI _STM only once */
466         if (!(drive->dn % 2)) {
467                 ide_acpi_set_state(hwif, 1);
468                 ide_acpi_push_timing(hwif);
469         }
470
471         ide_acpi_exec_tfs(drive);
472
473         memset(&rqpm, 0, sizeof(rqpm));
474         memset(&args, 0, sizeof(args));
475         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
476         rq->cmd_type = REQ_TYPE_PM_RESUME;
477         rq->cmd_flags |= REQ_PREEMPT;
478         rq->special = &args;
479         rq->data = &rqpm;
480         rqpm.pm_step = ide_pm_state_start_resume;
481         rqpm.pm_state = PM_EVENT_ON;
482
483         err = blk_execute_rq(drive->queue, NULL, rq, 1);
484         blk_put_request(rq);
485
486         if (err == 0 && dev->driver) {
487                 ide_driver_t *drv = to_ide_driver(dev->driver);
488
489                 if (drv->resume)
490                         drv->resume(drive);
491         }
492
493         return err;
494 }
495
496 static int generic_drive_reset(ide_drive_t *drive)
497 {
498         struct request *rq;
499         int ret = 0;
500
501         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
502         rq->cmd_type = REQ_TYPE_SPECIAL;
503         rq->cmd_len = 1;
504         rq->cmd[0] = REQ_DRIVE_RESET;
505         rq->cmd_flags |= REQ_SOFTBARRIER;
506         if (blk_execute_rq(drive->queue, NULL, rq, 1))
507                 ret = rq->errors;
508         blk_put_request(rq);
509         return ret;
510 }
511
512 static inline void ide_id_to_hd_driveid(u16 *id)
513 {
514 #ifdef __BIG_ENDIAN
515         /* accessed in struct hd_driveid as 8-bit values */
516         id[ATA_ID_MAX_MULTSECT]  = __cpu_to_le16(id[ATA_ID_MAX_MULTSECT]);
517         id[ATA_ID_CAPABILITY]    = __cpu_to_le16(id[ATA_ID_CAPABILITY]);
518         id[ATA_ID_OLD_PIO_MODES] = __cpu_to_le16(id[ATA_ID_OLD_PIO_MODES]);
519         id[ATA_ID_OLD_DMA_MODES] = __cpu_to_le16(id[ATA_ID_OLD_DMA_MODES]);
520         id[ATA_ID_MULTSECT]      = __cpu_to_le16(id[ATA_ID_MULTSECT]);
521
522         /* as 32-bit values */
523         *(u32 *)&id[ATA_ID_LBA_CAPACITY] = ata_id_u32(id, ATA_ID_LBA_CAPACITY);
524         *(u32 *)&id[ATA_ID_SPG]          = ata_id_u32(id, ATA_ID_SPG);
525
526         /* as 64-bit value */
527         *(u64 *)&id[ATA_ID_LBA_CAPACITY_2] =
528                 ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
529 #endif
530 }
531
532 static int ide_get_identity_ioctl(ide_drive_t *drive, unsigned int cmd,
533                                   unsigned long arg)
534 {
535         u16 *id = NULL;
536         int size = (cmd == HDIO_GET_IDENTITY) ? (ATA_ID_WORDS * 2) : 142;
537         int rc = 0;
538
539         if (drive->id_read == 0) {
540                 rc = -ENOMSG;
541                 goto out;
542         }
543
544         id = kmalloc(size, GFP_KERNEL);
545         if (id == NULL) {
546                 rc = -ENOMEM;
547                 goto out;
548         }
549
550         memcpy(id, drive->id, size);
551         ide_id_to_hd_driveid(id);
552
553         if (copy_to_user((void __user *)arg, id, size))
554                 rc = -EFAULT;
555
556         kfree(id);
557 out:
558         return rc;
559 }
560
561 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
562                         unsigned int cmd, unsigned long arg)
563 {
564         unsigned long flags;
565         ide_driver_t *drv;
566         int err = 0, (*getfunc)(ide_drive_t *), (*setfunc)(ide_drive_t *, int);
567
568         switch (cmd) {
569         case HDIO_GET_32BIT:        getfunc = get_io_32bit;      goto read_val;
570         case HDIO_GET_KEEPSETTINGS: getfunc = get_ksettings;     goto read_val;
571         case HDIO_GET_UNMASKINTR:   getfunc = get_unmaskirq;     goto read_val;
572         case HDIO_GET_DMA:          getfunc = get_using_dma;     goto read_val;
573         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
574         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
575         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
576         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
577         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
578         }
579
580         switch (cmd) {
581                 case HDIO_OBSOLETE_IDENTITY:
582                 case HDIO_GET_IDENTITY:
583                         if (bdev != bdev->bd_contains)
584                                 return -EINVAL;
585                         return ide_get_identity_ioctl(drive, cmd, arg);
586                 case HDIO_GET_NICE:
587                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
588                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
589                                         drive->nice1 << IDE_NICE_1,
590                                         (long __user *) arg);
591 #ifdef CONFIG_IDE_TASK_IOCTL
592                 case HDIO_DRIVE_TASKFILE:
593                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
594                                 return -EACCES;
595                         switch(drive->media) {
596                                 case ide_disk:
597                                         return ide_taskfile_ioctl(drive, cmd, arg);
598                                 default:
599                                         return -ENOMSG;
600                         }
601 #endif /* CONFIG_IDE_TASK_IOCTL */
602
603                 case HDIO_DRIVE_CMD:
604                         if (!capable(CAP_SYS_RAWIO))
605                                 return -EACCES;
606                         return ide_cmd_ioctl(drive, cmd, arg);
607
608                 case HDIO_DRIVE_TASK:
609                         if (!capable(CAP_SYS_RAWIO))
610                                 return -EACCES;
611                         return ide_task_ioctl(drive, cmd, arg);
612                 case HDIO_SET_NICE:
613                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
614                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
615                                 return -EPERM;
616                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
617                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
618                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
619                                 drive->dsc_overlap = 0;
620                                 return -EPERM;
621                         }
622                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
623                         return 0;
624                 case HDIO_DRIVE_RESET:
625                         if (!capable(CAP_SYS_ADMIN))
626                                 return -EACCES;
627
628                         return generic_drive_reset(drive);
629
630                 case HDIO_GET_BUSSTATE:
631                         if (!capable(CAP_SYS_ADMIN))
632                                 return -EACCES;
633                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
634                                 return -EFAULT;
635                         return 0;
636
637                 case HDIO_SET_BUSSTATE:
638                         if (!capable(CAP_SYS_ADMIN))
639                                 return -EACCES;
640                         return -EOPNOTSUPP;
641                 default:
642                         return -EINVAL;
643         }
644
645 read_val:
646         mutex_lock(&ide_setting_mtx);
647         spin_lock_irqsave(&ide_lock, flags);
648         err = getfunc(drive);
649         spin_unlock_irqrestore(&ide_lock, flags);
650         mutex_unlock(&ide_setting_mtx);
651         return err >= 0 ? put_user(err, (long __user *)arg) : err;
652
653 set_val:
654         if (bdev != bdev->bd_contains)
655                 err = -EINVAL;
656         else {
657                 if (!capable(CAP_SYS_ADMIN))
658                         err = -EACCES;
659                 else {
660                         mutex_lock(&ide_setting_mtx);
661                         err = setfunc(drive, arg);
662                         mutex_unlock(&ide_setting_mtx);
663                 }
664         }
665         return err;
666 }
667
668 EXPORT_SYMBOL(generic_ide_ioctl);
669
670 /**
671  * ide_device_get       -       get an additional reference to a ide_drive_t
672  * @drive:      device to get a reference to
673  *
674  * Gets a reference to the ide_drive_t and increments the use count of the
675  * underlying LLDD module.
676  */
677 int ide_device_get(ide_drive_t *drive)
678 {
679         struct device *host_dev;
680         struct module *module;
681
682         if (!get_device(&drive->gendev))
683                 return -ENXIO;
684
685         host_dev = drive->hwif->host->dev[0];
686         module = host_dev ? host_dev->driver->owner : NULL;
687
688         if (module && !try_module_get(module)) {
689                 put_device(&drive->gendev);
690                 return -ENXIO;
691         }
692
693         return 0;
694 }
695 EXPORT_SYMBOL_GPL(ide_device_get);
696
697 /**
698  * ide_device_put       -       release a reference to a ide_drive_t
699  * @drive:      device to release a reference on
700  *
701  * Release a reference to the ide_drive_t and decrements the use count of
702  * the underlying LLDD module.
703  */
704 void ide_device_put(ide_drive_t *drive)
705 {
706 #ifdef CONFIG_MODULE_UNLOAD
707         struct device *host_dev = drive->hwif->host->dev[0];
708         struct module *module = host_dev ? host_dev->driver->owner : NULL;
709
710         if (module)
711                 module_put(module);
712 #endif
713         put_device(&drive->gendev);
714 }
715 EXPORT_SYMBOL_GPL(ide_device_put);
716
717 static int ide_bus_match(struct device *dev, struct device_driver *drv)
718 {
719         return 1;
720 }
721
722 static char *media_string(ide_drive_t *drive)
723 {
724         switch (drive->media) {
725         case ide_disk:
726                 return "disk";
727         case ide_cdrom:
728                 return "cdrom";
729         case ide_tape:
730                 return "tape";
731         case ide_floppy:
732                 return "floppy";
733         case ide_optical:
734                 return "optical";
735         default:
736                 return "UNKNOWN";
737         }
738 }
739
740 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
741 {
742         ide_drive_t *drive = to_ide_device(dev);
743         return sprintf(buf, "%s\n", media_string(drive));
744 }
745
746 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
747 {
748         ide_drive_t *drive = to_ide_device(dev);
749         return sprintf(buf, "%s\n", drive->name);
750 }
751
752 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
753 {
754         ide_drive_t *drive = to_ide_device(dev);
755         return sprintf(buf, "ide:m-%s\n", media_string(drive));
756 }
757
758 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
759                           char *buf)
760 {
761         ide_drive_t *drive = to_ide_device(dev);
762         return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_PROD]);
763 }
764
765 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
766                              char *buf)
767 {
768         ide_drive_t *drive = to_ide_device(dev);
769         return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_FW_REV]);
770 }
771
772 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
773                            char *buf)
774 {
775         ide_drive_t *drive = to_ide_device(dev);
776         return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_SERNO]);
777 }
778
779 static struct device_attribute ide_dev_attrs[] = {
780         __ATTR_RO(media),
781         __ATTR_RO(drivename),
782         __ATTR_RO(modalias),
783         __ATTR_RO(model),
784         __ATTR_RO(firmware),
785         __ATTR(serial, 0400, serial_show, NULL),
786         __ATTR_NULL
787 };
788
789 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
790 {
791         ide_drive_t *drive = to_ide_device(dev);
792
793         add_uevent_var(env, "MEDIA=%s", media_string(drive));
794         add_uevent_var(env, "DRIVENAME=%s", drive->name);
795         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
796         return 0;
797 }
798
799 static int generic_ide_probe(struct device *dev)
800 {
801         ide_drive_t *drive = to_ide_device(dev);
802         ide_driver_t *drv = to_ide_driver(dev->driver);
803
804         return drv->probe ? drv->probe(drive) : -ENODEV;
805 }
806
807 static int generic_ide_remove(struct device *dev)
808 {
809         ide_drive_t *drive = to_ide_device(dev);
810         ide_driver_t *drv = to_ide_driver(dev->driver);
811
812         if (drv->remove)
813                 drv->remove(drive);
814
815         return 0;
816 }
817
818 static void generic_ide_shutdown(struct device *dev)
819 {
820         ide_drive_t *drive = to_ide_device(dev);
821         ide_driver_t *drv = to_ide_driver(dev->driver);
822
823         if (dev->driver && drv->shutdown)
824                 drv->shutdown(drive);
825 }
826
827 struct bus_type ide_bus_type = {
828         .name           = "ide",
829         .match          = ide_bus_match,
830         .uevent         = ide_uevent,
831         .probe          = generic_ide_probe,
832         .remove         = generic_ide_remove,
833         .shutdown       = generic_ide_shutdown,
834         .dev_attrs      = ide_dev_attrs,
835         .suspend        = generic_ide_suspend,
836         .resume         = generic_ide_resume,
837 };
838
839 EXPORT_SYMBOL_GPL(ide_bus_type);
840
841 int ide_vlb_clk;
842 EXPORT_SYMBOL_GPL(ide_vlb_clk);
843
844 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
845 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
846
847 int ide_pci_clk;
848 EXPORT_SYMBOL_GPL(ide_pci_clk);
849
850 module_param_named(pci_clock, ide_pci_clk, int, 0);
851 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
852
853 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
854 {
855         int a, b, i, j = 1;
856         unsigned int *dev_param_mask = (unsigned int *)kp->arg;
857
858         if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
859             sscanf(s, "%d.%d", &a, &b) != 2)
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 (j)
868                 *dev_param_mask |= (1 << i);
869         else
870                 *dev_param_mask &= (1 << i);
871
872         return 0;
873 }
874
875 static unsigned int ide_nodma;
876
877 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
878 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
879
880 static unsigned int ide_noflush;
881
882 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
883 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
884
885 static unsigned int ide_noprobe;
886
887 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
888 MODULE_PARM_DESC(noprobe, "skip probing for a device");
889
890 static unsigned int ide_nowerr;
891
892 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
893 MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device");
894
895 static unsigned int ide_cdroms;
896
897 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
898 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
899
900 struct chs_geom {
901         unsigned int    cyl;
902         u8              head;
903         u8              sect;
904 };
905
906 static unsigned int ide_disks;
907 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
908
909 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
910 {
911         int a, b, c = 0, h = 0, s = 0, i, j = 1;
912
913         if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
914             sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
915                 return -EINVAL;
916
917         i = a * MAX_DRIVES + b;
918
919         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
920                 return -EINVAL;
921
922         if (c > INT_MAX || h > 255 || s > 255)
923                 return -EINVAL;
924
925         if (j)
926                 ide_disks |= (1 << i);
927         else
928                 ide_disks &= (1 << i);
929
930         ide_disks_chs[i].cyl  = c;
931         ide_disks_chs[i].head = h;
932         ide_disks_chs[i].sect = s;
933
934         return 0;
935 }
936
937 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
938 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
939
940 static void ide_dev_apply_params(ide_drive_t *drive)
941 {
942         int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
943
944         if (ide_nodma & (1 << i)) {
945                 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
946                 drive->nodma = 1;
947         }
948         if (ide_noflush & (1 << i)) {
949                 printk(KERN_INFO "ide: disabling flush requests for %s\n",
950                                  drive->name);
951                 drive->noflush = 1;
952         }
953         if (ide_noprobe & (1 << i)) {
954                 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
955                 drive->noprobe = 1;
956         }
957         if (ide_nowerr & (1 << i)) {
958                 printk(KERN_INFO "ide: ignoring the ATA_DF bit for %s\n",
959                                  drive->name);
960                 drive->bad_wstat = BAD_R_STAT;
961         }
962         if (ide_cdroms & (1 << i)) {
963                 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
964                 drive->present = 1;
965                 drive->media = ide_cdrom;
966                 /* an ATAPI device ignores DRDY */
967                 drive->ready_stat = 0;
968         }
969         if (ide_disks & (1 << i)) {
970                 drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
971                 drive->head = drive->bios_head = ide_disks_chs[i].head;
972                 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
973                 drive->forced_geom = 1;
974                 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
975                                  drive->name,
976                                  drive->cyl, drive->head, drive->sect);
977                 drive->present = 1;
978                 drive->media = ide_disk;
979                 drive->ready_stat = ATA_DRDY;
980         }
981 }
982
983 static unsigned int ide_ignore_cable;
984
985 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
986 {
987         int i, j = 1;
988
989         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
990                 return -EINVAL;
991
992         if (i >= MAX_HWIFS || j < 0 || j > 1)
993                 return -EINVAL;
994
995         if (j)
996                 ide_ignore_cable |= (1 << i);
997         else
998                 ide_ignore_cable &= (1 << i);
999
1000         return 0;
1001 }
1002
1003 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
1004 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
1005
1006 void ide_port_apply_params(ide_hwif_t *hwif)
1007 {
1008         int i;
1009
1010         if (ide_ignore_cable & (1 << hwif->index)) {
1011                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
1012                                  hwif->name);
1013                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1014         }
1015
1016         for (i = 0; i < MAX_DRIVES; i++)
1017                 ide_dev_apply_params(&hwif->drives[i]);
1018 }
1019
1020 /*
1021  * This is gets invoked once during initialization, to set *everything* up
1022  */
1023 static int __init ide_init(void)
1024 {
1025         int ret;
1026
1027         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
1028
1029         ret = bus_register(&ide_bus_type);
1030         if (ret < 0) {
1031                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1032                 return ret;
1033         }
1034
1035         ide_port_class = class_create(THIS_MODULE, "ide_port");
1036         if (IS_ERR(ide_port_class)) {
1037                 ret = PTR_ERR(ide_port_class);
1038                 goto out_port_class;
1039         }
1040
1041         proc_ide_create();
1042
1043         return 0;
1044
1045 out_port_class:
1046         bus_unregister(&ide_bus_type);
1047
1048         return ret;
1049 }
1050
1051 static void __exit ide_exit(void)
1052 {
1053         proc_ide_destroy();
1054
1055         class_destroy(ide_port_class);
1056
1057         bus_unregister(&ide_bus_type);
1058 }
1059
1060 module_init(ide_init);
1061 module_exit(ide_exit);
1062
1063 MODULE_LICENSE("GPL");