ide: add ide_device_{get,put}() helpers
[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 #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 /* Called with ide_lock held. */
137 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
138 {
139         int i;
140
141         for (i = 0; i < MAX_DRIVES; i++) {
142                 ide_drive_t *drive = &hwif->drives[i];
143
144                 if (drive->present) {
145                         spin_unlock_irq(&ide_lock);
146                         device_unregister(&drive->gendev);
147                         wait_for_completion(&drive->gendev_rel_comp);
148                         spin_lock_irq(&ide_lock);
149                 }
150         }
151 }
152
153 void ide_port_unregister_devices(ide_hwif_t *hwif)
154 {
155         mutex_lock(&ide_cfg_mtx);
156         spin_lock_irq(&ide_lock);
157         __ide_port_unregister_devices(hwif);
158         hwif->present = 0;
159         ide_port_init_devices_data(hwif);
160         spin_unlock_irq(&ide_lock);
161         mutex_unlock(&ide_cfg_mtx);
162 }
163 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
164
165 /**
166  *      ide_unregister          -       free an IDE interface
167  *      @hwif: IDE interface
168  *
169  *      Perform the final unregister of an IDE interface. At the moment
170  *      we don't refcount interfaces so this will also get split up.
171  *
172  *      Locking:
173  *      The caller must not hold the IDE locks
174  *      The drive present/vanishing is not yet properly locked
175  *      Take care with the callbacks. These have been split to avoid
176  *      deadlocking the IDE layer. The shutdown callback is called
177  *      before we take the lock and free resources. It is up to the
178  *      caller to be sure there is no pending I/O here, and that
179  *      the interface will not be reopened (present/vanishing locking
180  *      isn't yet done BTW). After we commit to the final kill we
181  *      call the cleanup callback with the ide locks held.
182  *
183  *      Unregister restores the hwif structures to the default state.
184  *      This is raving bonkers.
185  */
186
187 void ide_unregister(ide_hwif_t *hwif)
188 {
189         ide_hwif_t *g;
190         ide_hwgroup_t *hwgroup;
191         int irq_count = 0;
192
193         BUG_ON(in_interrupt());
194         BUG_ON(irqs_disabled());
195
196         mutex_lock(&ide_cfg_mtx);
197
198         spin_lock_irq(&ide_lock);
199         if (hwif->present) {
200                 __ide_port_unregister_devices(hwif);
201                 hwif->present = 0;
202         }
203         spin_unlock_irq(&ide_lock);
204
205         ide_proc_unregister_port(hwif);
206
207         hwgroup = hwif->hwgroup;
208         /*
209          * free the irq if we were the only hwif using it
210          */
211         g = hwgroup->hwif;
212         do {
213                 if (g->irq == hwif->irq)
214                         ++irq_count;
215                 g = g->next;
216         } while (g != hwgroup->hwif);
217         if (irq_count == 1)
218                 free_irq(hwif->irq, hwgroup);
219
220         ide_remove_port_from_hwgroup(hwif);
221
222         device_unregister(hwif->portdev);
223         device_unregister(&hwif->gendev);
224         wait_for_completion(&hwif->gendev_rel_comp);
225
226         /*
227          * Remove us from the kernel's knowledge
228          */
229         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
230         kfree(hwif->sg_table);
231         unregister_blkdev(hwif->major, hwif->name);
232
233         if (hwif->dma_base)
234                 ide_release_dma_engine(hwif);
235
236         mutex_unlock(&ide_cfg_mtx);
237 }
238
239 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
240 {
241         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
242         hwif->irq = hw->irq;
243         hwif->chipset = hw->chipset;
244         hwif->dev = hw->dev;
245         hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
246         hwif->ack_intr = hw->ack_intr;
247         hwif->config_data = hw->config;
248 }
249
250 /*
251  *      Locks for IDE setting functionality
252  */
253
254 DEFINE_MUTEX(ide_setting_mtx);
255
256 EXPORT_SYMBOL_GPL(ide_setting_mtx);
257
258 /**
259  *      ide_spin_wait_hwgroup   -       wait for group
260  *      @drive: drive in the group
261  *
262  *      Wait for an IDE device group to go non busy and then return
263  *      holding the ide_lock which guards the hwgroup->busy status
264  *      and right to use it.
265  */
266
267 int ide_spin_wait_hwgroup (ide_drive_t *drive)
268 {
269         ide_hwgroup_t *hwgroup = HWGROUP(drive);
270         unsigned long timeout = jiffies + (3 * HZ);
271
272         spin_lock_irq(&ide_lock);
273
274         while (hwgroup->busy) {
275                 unsigned long lflags;
276                 spin_unlock_irq(&ide_lock);
277                 local_irq_set(lflags);
278                 if (time_after(jiffies, timeout)) {
279                         local_irq_restore(lflags);
280                         printk(KERN_ERR "%s: channel busy\n", drive->name);
281                         return -EBUSY;
282                 }
283                 local_irq_restore(lflags);
284                 spin_lock_irq(&ide_lock);
285         }
286         return 0;
287 }
288
289 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
290
291 int set_io_32bit(ide_drive_t *drive, int arg)
292 {
293         if (drive->no_io_32bit)
294                 return -EPERM;
295
296         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
297                 return -EINVAL;
298
299         if (ide_spin_wait_hwgroup(drive))
300                 return -EBUSY;
301
302         drive->io_32bit = arg;
303
304         spin_unlock_irq(&ide_lock);
305
306         return 0;
307 }
308
309 static int set_ksettings(ide_drive_t *drive, int arg)
310 {
311         if (arg < 0 || arg > 1)
312                 return -EINVAL;
313
314         if (ide_spin_wait_hwgroup(drive))
315                 return -EBUSY;
316         drive->keep_settings = arg;
317         spin_unlock_irq(&ide_lock);
318
319         return 0;
320 }
321
322 int set_using_dma(ide_drive_t *drive, int arg)
323 {
324 #ifdef CONFIG_BLK_DEV_IDEDMA
325         ide_hwif_t *hwif = drive->hwif;
326         int err = -EPERM;
327
328         if (arg < 0 || arg > 1)
329                 return -EINVAL;
330
331         if (!drive->id || !(drive->id->capability & 1))
332                 goto out;
333
334         if (hwif->dma_ops == NULL)
335                 goto out;
336
337         err = -EBUSY;
338         if (ide_spin_wait_hwgroup(drive))
339                 goto out;
340         /*
341          * set ->busy flag, unlock and let it ride
342          */
343         hwif->hwgroup->busy = 1;
344         spin_unlock_irq(&ide_lock);
345
346         err = 0;
347
348         if (arg) {
349                 if (ide_set_dma(drive))
350                         err = -EIO;
351         } else
352                 ide_dma_off(drive);
353
354         /*
355          * lock, clear ->busy flag and unlock before leaving
356          */
357         spin_lock_irq(&ide_lock);
358         hwif->hwgroup->busy = 0;
359         spin_unlock_irq(&ide_lock);
360 out:
361         return err;
362 #else
363         if (arg < 0 || arg > 1)
364                 return -EINVAL;
365
366         return -EPERM;
367 #endif
368 }
369
370 int set_pio_mode(ide_drive_t *drive, int arg)
371 {
372         struct request *rq;
373         ide_hwif_t *hwif = drive->hwif;
374         const struct ide_port_ops *port_ops = hwif->port_ops;
375
376         if (arg < 0 || arg > 255)
377                 return -EINVAL;
378
379         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
380             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
381                 return -ENOSYS;
382
383         if (drive->special.b.set_tune)
384                 return -EBUSY;
385
386         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
387         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
388
389         drive->tune_req = (u8) arg;
390         drive->special.b.set_tune = 1;
391
392         blk_execute_rq(drive->queue, NULL, rq, 0);
393         blk_put_request(rq);
394
395         return 0;
396 }
397
398 static int set_unmaskirq(ide_drive_t *drive, int arg)
399 {
400         if (drive->no_unmask)
401                 return -EPERM;
402
403         if (arg < 0 || arg > 1)
404                 return -EINVAL;
405
406         if (ide_spin_wait_hwgroup(drive))
407                 return -EBUSY;
408         drive->unmask = arg;
409         spin_unlock_irq(&ide_lock);
410
411         return 0;
412 }
413
414 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
415 {
416         ide_drive_t *drive = dev->driver_data;
417         ide_hwif_t *hwif = HWIF(drive);
418         struct request *rq;
419         struct request_pm_state rqpm;
420         ide_task_t args;
421         int ret;
422
423         /* Call ACPI _GTM only once */
424         if (!(drive->dn % 2))
425                 ide_acpi_get_timing(hwif);
426
427         memset(&rqpm, 0, sizeof(rqpm));
428         memset(&args, 0, sizeof(args));
429         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
430         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
431         rq->special = &args;
432         rq->data = &rqpm;
433         rqpm.pm_step = ide_pm_state_start_suspend;
434         if (mesg.event == PM_EVENT_PRETHAW)
435                 mesg.event = PM_EVENT_FREEZE;
436         rqpm.pm_state = mesg.event;
437
438         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
439         blk_put_request(rq);
440         /* only call ACPI _PS3 after both drivers are suspended */
441         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
442                  && hwif->drives[1].present)
443                  || !hwif->drives[0].present
444                  || !hwif->drives[1].present))
445                 ide_acpi_set_state(hwif, 0);
446         return ret;
447 }
448
449 static int generic_ide_resume(struct device *dev)
450 {
451         ide_drive_t *drive = dev->driver_data;
452         ide_hwif_t *hwif = HWIF(drive);
453         struct request *rq;
454         struct request_pm_state rqpm;
455         ide_task_t args;
456         int err;
457
458         /* Call ACPI _STM only once */
459         if (!(drive->dn % 2)) {
460                 ide_acpi_set_state(hwif, 1);
461                 ide_acpi_push_timing(hwif);
462         }
463
464         ide_acpi_exec_tfs(drive);
465
466         memset(&rqpm, 0, sizeof(rqpm));
467         memset(&args, 0, sizeof(args));
468         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
469         rq->cmd_type = REQ_TYPE_PM_RESUME;
470         rq->cmd_flags |= REQ_PREEMPT;
471         rq->special = &args;
472         rq->data = &rqpm;
473         rqpm.pm_step = ide_pm_state_start_resume;
474         rqpm.pm_state = PM_EVENT_ON;
475
476         err = blk_execute_rq(drive->queue, NULL, rq, 1);
477         blk_put_request(rq);
478
479         if (err == 0 && dev->driver) {
480                 ide_driver_t *drv = to_ide_driver(dev->driver);
481
482                 if (drv->resume)
483                         drv->resume(drive);
484         }
485
486         return err;
487 }
488
489 static int generic_drive_reset(ide_drive_t *drive)
490 {
491         struct request *rq;
492         int ret = 0;
493
494         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
495         rq->cmd_type = REQ_TYPE_SPECIAL;
496         rq->cmd_len = 1;
497         rq->cmd[0] = REQ_DRIVE_RESET;
498         rq->cmd_flags |= REQ_SOFTBARRIER;
499         if (blk_execute_rq(drive->queue, NULL, rq, 1))
500                 ret = rq->errors;
501         blk_put_request(rq);
502         return ret;
503 }
504
505 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
506                         unsigned int cmd, unsigned long arg)
507 {
508         unsigned long flags;
509         ide_driver_t *drv;
510         void __user *p = (void __user *)arg;
511         int err = 0, (*setfunc)(ide_drive_t *, int);
512         u8 *val;
513
514         switch (cmd) {
515         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
516         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
517         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
518         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
519         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
520         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
521         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
522         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
523         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
524         }
525
526         switch (cmd) {
527                 case HDIO_OBSOLETE_IDENTITY:
528                 case HDIO_GET_IDENTITY:
529                         if (bdev != bdev->bd_contains)
530                                 return -EINVAL;
531                         if (drive->id_read == 0)
532                                 return -ENOMSG;
533                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
534                                 return -EFAULT;
535                         return 0;
536
537                 case HDIO_GET_NICE:
538                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
539                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
540                                         drive->nice1 << IDE_NICE_1,
541                                         (long __user *) arg);
542 #ifdef CONFIG_IDE_TASK_IOCTL
543                 case HDIO_DRIVE_TASKFILE:
544                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
545                                 return -EACCES;
546                         switch(drive->media) {
547                                 case ide_disk:
548                                         return ide_taskfile_ioctl(drive, cmd, arg);
549                                 default:
550                                         return -ENOMSG;
551                         }
552 #endif /* CONFIG_IDE_TASK_IOCTL */
553
554                 case HDIO_DRIVE_CMD:
555                         if (!capable(CAP_SYS_RAWIO))
556                                 return -EACCES;
557                         return ide_cmd_ioctl(drive, cmd, arg);
558
559                 case HDIO_DRIVE_TASK:
560                         if (!capable(CAP_SYS_RAWIO))
561                                 return -EACCES;
562                         return ide_task_ioctl(drive, cmd, arg);
563                 case HDIO_SET_NICE:
564                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
565                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
566                                 return -EPERM;
567                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
568                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
569                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
570                                 drive->dsc_overlap = 0;
571                                 return -EPERM;
572                         }
573                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
574                         return 0;
575                 case HDIO_DRIVE_RESET:
576                         if (!capable(CAP_SYS_ADMIN))
577                                 return -EACCES;
578
579                         return generic_drive_reset(drive);
580
581                 case HDIO_GET_BUSSTATE:
582                         if (!capable(CAP_SYS_ADMIN))
583                                 return -EACCES;
584                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
585                                 return -EFAULT;
586                         return 0;
587
588                 case HDIO_SET_BUSSTATE:
589                         if (!capable(CAP_SYS_ADMIN))
590                                 return -EACCES;
591                         return -EOPNOTSUPP;
592                 default:
593                         return -EINVAL;
594         }
595
596 read_val:
597         mutex_lock(&ide_setting_mtx);
598         spin_lock_irqsave(&ide_lock, flags);
599         err = *val;
600         spin_unlock_irqrestore(&ide_lock, flags);
601         mutex_unlock(&ide_setting_mtx);
602         return err >= 0 ? put_user(err, (long __user *)arg) : err;
603
604 set_val:
605         if (bdev != bdev->bd_contains)
606                 err = -EINVAL;
607         else {
608                 if (!capable(CAP_SYS_ADMIN))
609                         err = -EACCES;
610                 else {
611                         mutex_lock(&ide_setting_mtx);
612                         err = setfunc(drive, arg);
613                         mutex_unlock(&ide_setting_mtx);
614                 }
615         }
616         return err;
617 }
618
619 EXPORT_SYMBOL(generic_ide_ioctl);
620
621 /**
622  * ide_device_get       -       get an additional reference to a ide_drive_t
623  * @drive:      device to get a reference to
624  *
625  * Gets a reference to the ide_drive_t and increments the use count of the
626  * underlying LLDD module.
627  */
628 int ide_device_get(ide_drive_t *drive)
629 {
630         struct device *host_dev;
631         struct module *module;
632
633         if (!get_device(&drive->gendev))
634                 return -ENXIO;
635
636         host_dev = drive->hwif->host->dev[0];
637         module = host_dev ? host_dev->driver->owner : NULL;
638
639         if (module && !try_module_get(module)) {
640                 put_device(&drive->gendev);
641                 return -ENXIO;
642         }
643
644         return 0;
645 }
646 EXPORT_SYMBOL_GPL(ide_device_get);
647
648 /**
649  * ide_device_put       -       release a reference to a ide_drive_t
650  * @drive:      device to release a reference on
651  *
652  * Release a reference to the ide_drive_t and decrements the use count of
653  * the underlying LLDD module.
654  */
655 void ide_device_put(ide_drive_t *drive)
656 {
657 #ifdef CONFIG_MODULE_UNLOAD
658         struct device *host_dev = drive->hwif->host->dev[0];
659         struct module *module = host_dev ? host_dev->driver->owner : NULL;
660
661         if (module)
662                 module_put(module);
663 #endif
664         put_device(&drive->gendev);
665 }
666 EXPORT_SYMBOL_GPL(ide_device_put);
667
668 static int ide_bus_match(struct device *dev, struct device_driver *drv)
669 {
670         return 1;
671 }
672
673 static char *media_string(ide_drive_t *drive)
674 {
675         switch (drive->media) {
676         case ide_disk:
677                 return "disk";
678         case ide_cdrom:
679                 return "cdrom";
680         case ide_tape:
681                 return "tape";
682         case ide_floppy:
683                 return "floppy";
684         case ide_optical:
685                 return "optical";
686         default:
687                 return "UNKNOWN";
688         }
689 }
690
691 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
692 {
693         ide_drive_t *drive = to_ide_device(dev);
694         return sprintf(buf, "%s\n", media_string(drive));
695 }
696
697 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
698 {
699         ide_drive_t *drive = to_ide_device(dev);
700         return sprintf(buf, "%s\n", drive->name);
701 }
702
703 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
704 {
705         ide_drive_t *drive = to_ide_device(dev);
706         return sprintf(buf, "ide:m-%s\n", media_string(drive));
707 }
708
709 static ssize_t model_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->model);
714 }
715
716 static ssize_t firmware_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->fw_rev);
721 }
722
723 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
724                            char *buf)
725 {
726         ide_drive_t *drive = to_ide_device(dev);
727         return sprintf(buf, "%s\n", drive->id->serial_no);
728 }
729
730 static struct device_attribute ide_dev_attrs[] = {
731         __ATTR_RO(media),
732         __ATTR_RO(drivename),
733         __ATTR_RO(modalias),
734         __ATTR_RO(model),
735         __ATTR_RO(firmware),
736         __ATTR(serial, 0400, serial_show, NULL),
737         __ATTR_NULL
738 };
739
740 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
741 {
742         ide_drive_t *drive = to_ide_device(dev);
743
744         add_uevent_var(env, "MEDIA=%s", media_string(drive));
745         add_uevent_var(env, "DRIVENAME=%s", drive->name);
746         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
747         return 0;
748 }
749
750 static int generic_ide_probe(struct device *dev)
751 {
752         ide_drive_t *drive = to_ide_device(dev);
753         ide_driver_t *drv = to_ide_driver(dev->driver);
754
755         return drv->probe ? drv->probe(drive) : -ENODEV;
756 }
757
758 static int generic_ide_remove(struct device *dev)
759 {
760         ide_drive_t *drive = to_ide_device(dev);
761         ide_driver_t *drv = to_ide_driver(dev->driver);
762
763         if (drv->remove)
764                 drv->remove(drive);
765
766         return 0;
767 }
768
769 static void generic_ide_shutdown(struct device *dev)
770 {
771         ide_drive_t *drive = to_ide_device(dev);
772         ide_driver_t *drv = to_ide_driver(dev->driver);
773
774         if (dev->driver && drv->shutdown)
775                 drv->shutdown(drive);
776 }
777
778 struct bus_type ide_bus_type = {
779         .name           = "ide",
780         .match          = ide_bus_match,
781         .uevent         = ide_uevent,
782         .probe          = generic_ide_probe,
783         .remove         = generic_ide_remove,
784         .shutdown       = generic_ide_shutdown,
785         .dev_attrs      = ide_dev_attrs,
786         .suspend        = generic_ide_suspend,
787         .resume         = generic_ide_resume,
788 };
789
790 EXPORT_SYMBOL_GPL(ide_bus_type);
791
792 int ide_vlb_clk;
793 EXPORT_SYMBOL_GPL(ide_vlb_clk);
794
795 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
796 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
797
798 int ide_pci_clk;
799 EXPORT_SYMBOL_GPL(ide_pci_clk);
800
801 module_param_named(pci_clock, ide_pci_clk, int, 0);
802 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
803
804 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
805 {
806         int a, b, i, j = 1;
807         unsigned int *dev_param_mask = (unsigned int *)kp->arg;
808
809         if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
810             sscanf(s, "%d.%d", &a, &b) != 2)
811                 return -EINVAL;
812
813         i = a * MAX_DRIVES + b;
814
815         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
816                 return -EINVAL;
817
818         if (j)
819                 *dev_param_mask |= (1 << i);
820         else
821                 *dev_param_mask &= (1 << i);
822
823         return 0;
824 }
825
826 static unsigned int ide_nodma;
827
828 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
829 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
830
831 static unsigned int ide_noflush;
832
833 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
834 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
835
836 static unsigned int ide_noprobe;
837
838 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
839 MODULE_PARM_DESC(noprobe, "skip probing for a device");
840
841 static unsigned int ide_nowerr;
842
843 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
844 MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device");
845
846 static unsigned int ide_cdroms;
847
848 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
849 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
850
851 struct chs_geom {
852         unsigned int    cyl;
853         u8              head;
854         u8              sect;
855 };
856
857 static unsigned int ide_disks;
858 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
859
860 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
861 {
862         int a, b, c = 0, h = 0, s = 0, i, j = 1;
863
864         if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
865             sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
866                 return -EINVAL;
867
868         i = a * MAX_DRIVES + b;
869
870         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
871                 return -EINVAL;
872
873         if (c > INT_MAX || h > 255 || s > 255)
874                 return -EINVAL;
875
876         if (j)
877                 ide_disks |= (1 << i);
878         else
879                 ide_disks &= (1 << i);
880
881         ide_disks_chs[i].cyl  = c;
882         ide_disks_chs[i].head = h;
883         ide_disks_chs[i].sect = s;
884
885         return 0;
886 }
887
888 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
889 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
890
891 static void ide_dev_apply_params(ide_drive_t *drive)
892 {
893         int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
894
895         if (ide_nodma & (1 << i)) {
896                 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
897                 drive->nodma = 1;
898         }
899         if (ide_noflush & (1 << i)) {
900                 printk(KERN_INFO "ide: disabling flush requests for %s\n",
901                                  drive->name);
902                 drive->noflush = 1;
903         }
904         if (ide_noprobe & (1 << i)) {
905                 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
906                 drive->noprobe = 1;
907         }
908         if (ide_nowerr & (1 << i)) {
909                 printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n",
910                                  drive->name);
911                 drive->bad_wstat = BAD_R_STAT;
912         }
913         if (ide_cdroms & (1 << i)) {
914                 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
915                 drive->present = 1;
916                 drive->media = ide_cdrom;
917                 /* an ATAPI device ignores DRDY */
918                 drive->ready_stat = 0;
919         }
920         if (ide_disks & (1 << i)) {
921                 drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
922                 drive->head = drive->bios_head = ide_disks_chs[i].head;
923                 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
924                 drive->forced_geom = 1;
925                 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
926                                  drive->name,
927                                  drive->cyl, drive->head, drive->sect);
928                 drive->present = 1;
929                 drive->media = ide_disk;
930                 drive->ready_stat = READY_STAT;
931         }
932 }
933
934 static unsigned int ide_ignore_cable;
935
936 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
937 {
938         int i, j = 1;
939
940         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
941                 return -EINVAL;
942
943         if (i >= MAX_HWIFS || j < 0 || j > 1)
944                 return -EINVAL;
945
946         if (j)
947                 ide_ignore_cable |= (1 << i);
948         else
949                 ide_ignore_cable &= (1 << i);
950
951         return 0;
952 }
953
954 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
955 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
956
957 void ide_port_apply_params(ide_hwif_t *hwif)
958 {
959         int i;
960
961         if (ide_ignore_cable & (1 << hwif->index)) {
962                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
963                                  hwif->name);
964                 hwif->cbl = ATA_CBL_PATA40_SHORT;
965         }
966
967         for (i = 0; i < MAX_DRIVES; i++)
968                 ide_dev_apply_params(&hwif->drives[i]);
969 }
970
971 /*
972  * This is gets invoked once during initialization, to set *everything* up
973  */
974 static int __init ide_init(void)
975 {
976         int ret;
977
978         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
979
980         ret = bus_register(&ide_bus_type);
981         if (ret < 0) {
982                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
983                 return ret;
984         }
985
986         ide_port_class = class_create(THIS_MODULE, "ide_port");
987         if (IS_ERR(ide_port_class)) {
988                 ret = PTR_ERR(ide_port_class);
989                 goto out_port_class;
990         }
991
992         proc_ide_create();
993
994         return 0;
995
996 out_port_class:
997         bus_unregister(&ide_bus_type);
998
999         return ret;
1000 }
1001
1002 static void __exit ide_exit(void)
1003 {
1004         proc_ide_destroy();
1005
1006         class_destroy(ide_port_class);
1007
1008         bus_unregister(&ide_bus_type);
1009 }
1010
1011 module_init(ide_init);
1012 module_exit(ide_exit);
1013
1014 MODULE_LICENSE("GPL");