3cac96f3b0aa02e51a2c7be7b41311d015a03131
[linux-2.6.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/timer.h>
54 #include <linux/mm.h>
55 #include <linux/interrupt.h>
56 #include <linux/major.h>
57 #include <linux/errno.h>
58 #include <linux/genhd.h>
59 #include <linux/blkpg.h>
60 #include <linux/slab.h>
61 #include <linux/init.h>
62 #include <linux/pci.h>
63 #include <linux/delay.h>
64 #include <linux/ide.h>
65 #include <linux/completion.h>
66 #include <linux/reboot.h>
67 #include <linux/cdrom.h>
68 #include <linux/seq_file.h>
69 #include <linux/device.h>
70 #include <linux/bitops.h>
71
72 #include <asm/byteorder.h>
73 #include <asm/irq.h>
74 #include <asm/uaccess.h>
75 #include <asm/io.h>
76
77
78 /* default maximum number of failures */
79 #define IDE_DEFAULT_MAX_FAILURES        1
80
81 struct class *ide_port_class;
82
83 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
84                                         IDE2_MAJOR, IDE3_MAJOR,
85                                         IDE4_MAJOR, IDE5_MAJOR,
86                                         IDE6_MAJOR, IDE7_MAJOR,
87                                         IDE8_MAJOR, IDE9_MAJOR };
88
89 static int idebus_parameter;    /* holds the "idebus=" parameter */
90 static int system_bus_speed;    /* holds what we think is VESA/PCI bus speed */
91
92 DEFINE_MUTEX(ide_cfg_mtx);
93  __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
94
95 int noautodma = 0;
96
97 #ifdef CONFIG_BLK_DEV_IDEACPI
98 int ide_noacpi = 0;
99 int ide_noacpitfs = 1;
100 int ide_noacpionboot = 1;
101 #endif
102
103 ide_hwif_t ide_hwifs[MAX_HWIFS];        /* master data repository */
104
105 static void ide_port_init_devices_data(ide_hwif_t *);
106
107 /*
108  * Do not even *think* about calling this!
109  */
110 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
111 {
112         /* bulk initialize hwif & drive info with zeros */
113         memset(hwif, 0, sizeof(ide_hwif_t));
114
115         /* fill in any non-zero initial values */
116         hwif->index     = index;
117         hwif->major     = ide_hwif_to_major[index];
118
119         hwif->name[0]   = 'i';
120         hwif->name[1]   = 'd';
121         hwif->name[2]   = 'e';
122         hwif->name[3]   = '0' + index;
123
124         hwif->bus_state = BUSSTATE_ON;
125
126         init_completion(&hwif->gendev_rel_comp);
127
128         default_hwif_iops(hwif);
129         default_hwif_transport(hwif);
130
131         ide_port_init_devices_data(hwif);
132 }
133 EXPORT_SYMBOL_GPL(ide_init_port_data);
134
135 static void ide_port_init_devices_data(ide_hwif_t *hwif)
136 {
137         int unit;
138
139         for (unit = 0; unit < MAX_DRIVES; ++unit) {
140                 ide_drive_t *drive = &hwif->drives[unit];
141                 u8 j = (hwif->index * MAX_DRIVES) + unit;
142
143                 memset(drive, 0, sizeof(*drive));
144
145                 drive->media                    = ide_disk;
146                 drive->select.all               = (unit<<4)|0xa0;
147                 drive->hwif                     = hwif;
148                 drive->ctl                      = 0x08;
149                 drive->ready_stat               = READY_STAT;
150                 drive->bad_wstat                = BAD_W_STAT;
151                 drive->special.b.recalibrate    = 1;
152                 drive->special.b.set_geometry   = 1;
153                 drive->name[0]                  = 'h';
154                 drive->name[1]                  = 'd';
155                 drive->name[2]                  = 'a' + j;
156                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
157
158                 INIT_LIST_HEAD(&drive->list);
159                 init_completion(&drive->gendev_rel_comp);
160         }
161 }
162
163 /*
164  * init_ide_data() sets reasonable default values into all fields
165  * of all instances of the hwifs and drives, but only on the first call.
166  * Subsequent calls have no effect (they don't wipe out anything).
167  *
168  * This routine is normally called at driver initialization time,
169  * but may also be called MUCH earlier during kernel "command-line"
170  * parameter processing.  As such, we cannot depend on any other parts
171  * of the kernel (such as memory allocation) to be functioning yet.
172  *
173  * This is too bad, as otherwise we could dynamically allocate the
174  * ide_drive_t structs as needed, rather than always consuming memory
175  * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
176  *
177  * FIXME: We should stuff the setup data into __init and copy the
178  * relevant hwifs/allocate them properly during boot.
179  */
180 #define MAGIC_COOKIE 0x12345678
181 static void __init init_ide_data (void)
182 {
183         unsigned int index;
184         static unsigned long magic_cookie = MAGIC_COOKIE;
185
186         if (magic_cookie != MAGIC_COOKIE)
187                 return;         /* already initialized */
188         magic_cookie = 0;
189
190         /* Initialise all interface structures */
191         for (index = 0; index < MAX_HWIFS; ++index) {
192                 ide_hwif_t *hwif = &ide_hwifs[index];
193
194                 ide_init_port_data(hwif, index);
195         }
196 }
197
198 /**
199  *      ide_system_bus_speed    -       guess bus speed
200  *
201  *      ide_system_bus_speed() returns what we think is the system VESA/PCI
202  *      bus speed (in MHz). This is used for calculating interface PIO timings.
203  *      The default is 40 for known PCI systems, 50 otherwise.
204  *      The "idebus=xx" parameter can be used to override this value.
205  *      The actual value to be used is computed/displayed the first time
206  *      through. Drivers should only use this as a last resort.
207  *
208  *      Returns a guessed speed in MHz.
209  */
210
211 static int ide_system_bus_speed(void)
212 {
213 #ifdef CONFIG_PCI
214         static struct pci_device_id pci_default[] = {
215                 { PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
216                 { }
217         };
218 #else
219 #define pci_default 0
220 #endif /* CONFIG_PCI */
221
222         /* user supplied value */
223         if (idebus_parameter)
224                 return idebus_parameter;
225
226         /* safe default value for PCI or VESA and PCI*/
227         return pci_dev_present(pci_default) ? 33 : 50;
228 }
229
230 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
231 {
232         ide_hwgroup_t *hwgroup = hwif->hwgroup;
233
234         spin_lock_irq(&ide_lock);
235         /*
236          * Remove us from the hwgroup, and free
237          * the hwgroup if we were the only member
238          */
239         if (hwif->next == hwif) {
240                 BUG_ON(hwgroup->hwif != hwif);
241                 kfree(hwgroup);
242         } else {
243                 /* There is another interface in hwgroup.
244                  * Unlink us, and set hwgroup->drive and ->hwif to
245                  * something sane.
246                  */
247                 ide_hwif_t *g = hwgroup->hwif;
248
249                 while (g->next != hwif)
250                         g = g->next;
251                 g->next = hwif->next;
252                 if (hwgroup->hwif == hwif) {
253                         /* Chose a random hwif for hwgroup->hwif.
254                          * It's guaranteed that there are no drives
255                          * left in the hwgroup.
256                          */
257                         BUG_ON(hwgroup->drive != NULL);
258                         hwgroup->hwif = g;
259                 }
260                 BUG_ON(hwgroup->hwif == hwif);
261         }
262         spin_unlock_irq(&ide_lock);
263 }
264
265 /* Called with ide_lock held. */
266 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
267 {
268         int i;
269
270         for (i = 0; i < MAX_DRIVES; i++) {
271                 ide_drive_t *drive = &hwif->drives[i];
272
273                 if (drive->present) {
274                         spin_unlock_irq(&ide_lock);
275                         device_unregister(&drive->gendev);
276                         wait_for_completion(&drive->gendev_rel_comp);
277                         spin_lock_irq(&ide_lock);
278                 }
279         }
280 }
281
282 void ide_port_unregister_devices(ide_hwif_t *hwif)
283 {
284         mutex_lock(&ide_cfg_mtx);
285         spin_lock_irq(&ide_lock);
286         __ide_port_unregister_devices(hwif);
287         hwif->present = 0;
288         ide_port_init_devices_data(hwif);
289         spin_unlock_irq(&ide_lock);
290         mutex_unlock(&ide_cfg_mtx);
291 }
292 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
293
294 /**
295  *      ide_unregister          -       free an IDE interface
296  *      @index: index of interface (will change soon to a pointer)
297  *
298  *      Perform the final unregister of an IDE interface. At the moment
299  *      we don't refcount interfaces so this will also get split up.
300  *
301  *      Locking:
302  *      The caller must not hold the IDE locks
303  *      The drive present/vanishing is not yet properly locked
304  *      Take care with the callbacks. These have been split to avoid
305  *      deadlocking the IDE layer. The shutdown callback is called
306  *      before we take the lock and free resources. It is up to the
307  *      caller to be sure there is no pending I/O here, and that
308  *      the interface will not be reopened (present/vanishing locking
309  *      isn't yet done BTW). After we commit to the final kill we
310  *      call the cleanup callback with the ide locks held.
311  *
312  *      Unregister restores the hwif structures to the default state.
313  *      This is raving bonkers.
314  */
315
316 void ide_unregister(unsigned int index)
317 {
318         ide_hwif_t *hwif, *g;
319         ide_hwgroup_t *hwgroup;
320         int irq_count = 0;
321
322         BUG_ON(index >= MAX_HWIFS);
323
324         BUG_ON(in_interrupt());
325         BUG_ON(irqs_disabled());
326         mutex_lock(&ide_cfg_mtx);
327         spin_lock_irq(&ide_lock);
328         hwif = &ide_hwifs[index];
329         if (!hwif->present)
330                 goto abort;
331         __ide_port_unregister_devices(hwif);
332         hwif->present = 0;
333
334         spin_unlock_irq(&ide_lock);
335
336         ide_proc_unregister_port(hwif);
337
338         hwgroup = hwif->hwgroup;
339         /*
340          * free the irq if we were the only hwif using it
341          */
342         g = hwgroup->hwif;
343         do {
344                 if (g->irq == hwif->irq)
345                         ++irq_count;
346                 g = g->next;
347         } while (g != hwgroup->hwif);
348         if (irq_count == 1)
349                 free_irq(hwif->irq, hwgroup);
350
351         ide_remove_port_from_hwgroup(hwif);
352
353         device_unregister(hwif->portdev);
354         device_unregister(&hwif->gendev);
355         wait_for_completion(&hwif->gendev_rel_comp);
356
357         /*
358          * Remove us from the kernel's knowledge
359          */
360         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
361         kfree(hwif->sg_table);
362         unregister_blkdev(hwif->major, hwif->name);
363         spin_lock_irq(&ide_lock);
364
365         if (hwif->dma_base)
366                 ide_release_dma_engine(hwif);
367
368         /* restore hwif data to pristine status */
369         ide_init_port_data(hwif, index);
370
371 abort:
372         spin_unlock_irq(&ide_lock);
373         mutex_unlock(&ide_cfg_mtx);
374 }
375
376 EXPORT_SYMBOL(ide_unregister);
377
378 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
379 {
380         memcpy(hwif->io_ports, hw->io_ports, sizeof(hwif->io_ports));
381         hwif->irq = hw->irq;
382         hwif->chipset = hw->chipset;
383         hwif->gendev.parent = hw->dev;
384         hwif->ack_intr = hw->ack_intr;
385 }
386 EXPORT_SYMBOL_GPL(ide_init_port_hw);
387
388 /*
389  *      Locks for IDE setting functionality
390  */
391
392 DEFINE_MUTEX(ide_setting_mtx);
393
394 EXPORT_SYMBOL_GPL(ide_setting_mtx);
395
396 /**
397  *      ide_spin_wait_hwgroup   -       wait for group
398  *      @drive: drive in the group
399  *
400  *      Wait for an IDE device group to go non busy and then return
401  *      holding the ide_lock which guards the hwgroup->busy status
402  *      and right to use it.
403  */
404
405 int ide_spin_wait_hwgroup (ide_drive_t *drive)
406 {
407         ide_hwgroup_t *hwgroup = HWGROUP(drive);
408         unsigned long timeout = jiffies + (3 * HZ);
409
410         spin_lock_irq(&ide_lock);
411
412         while (hwgroup->busy) {
413                 unsigned long lflags;
414                 spin_unlock_irq(&ide_lock);
415                 local_irq_set(lflags);
416                 if (time_after(jiffies, timeout)) {
417                         local_irq_restore(lflags);
418                         printk(KERN_ERR "%s: channel busy\n", drive->name);
419                         return -EBUSY;
420                 }
421                 local_irq_restore(lflags);
422                 spin_lock_irq(&ide_lock);
423         }
424         return 0;
425 }
426
427 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
428
429 int set_io_32bit(ide_drive_t *drive, int arg)
430 {
431         if (drive->no_io_32bit)
432                 return -EPERM;
433
434         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
435                 return -EINVAL;
436
437         if (ide_spin_wait_hwgroup(drive))
438                 return -EBUSY;
439
440         drive->io_32bit = arg;
441
442         spin_unlock_irq(&ide_lock);
443
444         return 0;
445 }
446
447 static int set_ksettings(ide_drive_t *drive, int arg)
448 {
449         if (arg < 0 || arg > 1)
450                 return -EINVAL;
451
452         if (ide_spin_wait_hwgroup(drive))
453                 return -EBUSY;
454         drive->keep_settings = arg;
455         spin_unlock_irq(&ide_lock);
456
457         return 0;
458 }
459
460 int set_using_dma(ide_drive_t *drive, int arg)
461 {
462 #ifdef CONFIG_BLK_DEV_IDEDMA
463         ide_hwif_t *hwif = drive->hwif;
464         int err = -EPERM;
465
466         if (arg < 0 || arg > 1)
467                 return -EINVAL;
468
469         if (!drive->id || !(drive->id->capability & 1))
470                 goto out;
471
472         if (hwif->dma_ops == NULL)
473                 goto out;
474
475         err = -EBUSY;
476         if (ide_spin_wait_hwgroup(drive))
477                 goto out;
478         /*
479          * set ->busy flag, unlock and let it ride
480          */
481         hwif->hwgroup->busy = 1;
482         spin_unlock_irq(&ide_lock);
483
484         err = 0;
485
486         if (arg) {
487                 if (ide_set_dma(drive))
488                         err = -EIO;
489         } else
490                 ide_dma_off(drive);
491
492         /*
493          * lock, clear ->busy flag and unlock before leaving
494          */
495         spin_lock_irq(&ide_lock);
496         hwif->hwgroup->busy = 0;
497         spin_unlock_irq(&ide_lock);
498 out:
499         return err;
500 #else
501         if (arg < 0 || arg > 1)
502                 return -EINVAL;
503
504         return -EPERM;
505 #endif
506 }
507
508 int set_pio_mode(ide_drive_t *drive, int arg)
509 {
510         struct request rq;
511         ide_hwif_t *hwif = drive->hwif;
512         const struct ide_port_ops *port_ops = hwif->port_ops;
513
514         if (arg < 0 || arg > 255)
515                 return -EINVAL;
516
517         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
518             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
519                 return -ENOSYS;
520
521         if (drive->special.b.set_tune)
522                 return -EBUSY;
523
524         ide_init_drive_cmd(&rq);
525         rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
526
527         drive->tune_req = (u8) arg;
528         drive->special.b.set_tune = 1;
529         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
530         return 0;
531 }
532
533 static int set_unmaskirq(ide_drive_t *drive, int arg)
534 {
535         if (drive->no_unmask)
536                 return -EPERM;
537
538         if (arg < 0 || arg > 1)
539                 return -EINVAL;
540
541         if (ide_spin_wait_hwgroup(drive))
542                 return -EBUSY;
543         drive->unmask = arg;
544         spin_unlock_irq(&ide_lock);
545
546         return 0;
547 }
548
549 /**
550  *      system_bus_clock        -       clock guess
551  *
552  *      External version of the bus clock guess used by very old IDE drivers
553  *      for things like VLB timings. Should not be used.
554  */
555
556 int system_bus_clock (void)
557 {
558         return system_bus_speed;
559 }
560
561 EXPORT_SYMBOL(system_bus_clock);
562
563 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
564 {
565         ide_drive_t *drive = dev->driver_data;
566         ide_hwif_t *hwif = HWIF(drive);
567         struct request rq;
568         struct request_pm_state rqpm;
569         ide_task_t args;
570         int ret;
571
572         /* Call ACPI _GTM only once */
573         if (!(drive->dn % 2))
574                 ide_acpi_get_timing(hwif);
575
576         memset(&rq, 0, sizeof(rq));
577         memset(&rqpm, 0, sizeof(rqpm));
578         memset(&args, 0, sizeof(args));
579         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
580         rq.special = &args;
581         rq.data = &rqpm;
582         rqpm.pm_step = ide_pm_state_start_suspend;
583         if (mesg.event == PM_EVENT_PRETHAW)
584                 mesg.event = PM_EVENT_FREEZE;
585         rqpm.pm_state = mesg.event;
586
587         ret = ide_do_drive_cmd(drive, &rq, ide_wait);
588         /* only call ACPI _PS3 after both drivers are suspended */
589         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
590                  && hwif->drives[1].present)
591                  || !hwif->drives[0].present
592                  || !hwif->drives[1].present))
593                 ide_acpi_set_state(hwif, 0);
594         return ret;
595 }
596
597 static int generic_ide_resume(struct device *dev)
598 {
599         ide_drive_t *drive = dev->driver_data;
600         ide_hwif_t *hwif = HWIF(drive);
601         struct request rq;
602         struct request_pm_state rqpm;
603         ide_task_t args;
604         int err;
605
606         /* Call ACPI _STM only once */
607         if (!(drive->dn % 2)) {
608                 ide_acpi_set_state(hwif, 1);
609                 ide_acpi_push_timing(hwif);
610         }
611
612         ide_acpi_exec_tfs(drive);
613
614         memset(&rq, 0, sizeof(rq));
615         memset(&rqpm, 0, sizeof(rqpm));
616         memset(&args, 0, sizeof(args));
617         rq.cmd_type = REQ_TYPE_PM_RESUME;
618         rq.special = &args;
619         rq.data = &rqpm;
620         rqpm.pm_step = ide_pm_state_start_resume;
621         rqpm.pm_state = PM_EVENT_ON;
622
623         err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
624
625         if (err == 0 && dev->driver) {
626                 ide_driver_t *drv = to_ide_driver(dev->driver);
627
628                 if (drv->resume)
629                         drv->resume(drive);
630         }
631
632         return err;
633 }
634
635 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
636                         unsigned int cmd, unsigned long arg)
637 {
638         unsigned long flags;
639         ide_driver_t *drv;
640         void __user *p = (void __user *)arg;
641         int err = 0, (*setfunc)(ide_drive_t *, int);
642         u8 *val;
643
644         switch (cmd) {
645         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
646         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
647         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
648         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
649         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
650         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
651         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
652         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
653         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
654         }
655
656         switch (cmd) {
657                 case HDIO_OBSOLETE_IDENTITY:
658                 case HDIO_GET_IDENTITY:
659                         if (bdev != bdev->bd_contains)
660                                 return -EINVAL;
661                         if (drive->id_read == 0)
662                                 return -ENOMSG;
663                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
664                                 return -EFAULT;
665                         return 0;
666
667                 case HDIO_GET_NICE:
668                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
669                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
670                                         drive->nice1 << IDE_NICE_1,
671                                         (long __user *) arg);
672 #ifdef CONFIG_IDE_TASK_IOCTL
673                 case HDIO_DRIVE_TASKFILE:
674                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
675                                 return -EACCES;
676                         switch(drive->media) {
677                                 case ide_disk:
678                                         return ide_taskfile_ioctl(drive, cmd, arg);
679                                 default:
680                                         return -ENOMSG;
681                         }
682 #endif /* CONFIG_IDE_TASK_IOCTL */
683
684                 case HDIO_DRIVE_CMD:
685                         if (!capable(CAP_SYS_RAWIO))
686                                 return -EACCES;
687                         return ide_cmd_ioctl(drive, cmd, arg);
688
689                 case HDIO_DRIVE_TASK:
690                         if (!capable(CAP_SYS_RAWIO))
691                                 return -EACCES;
692                         return ide_task_ioctl(drive, cmd, arg);
693                 case HDIO_SET_NICE:
694                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
695                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
696                                 return -EPERM;
697                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
698                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
699                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
700                                 drive->dsc_overlap = 0;
701                                 return -EPERM;
702                         }
703                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
704                         return 0;
705                 case HDIO_DRIVE_RESET:
706                         if (!capable(CAP_SYS_ADMIN))
707                                 return -EACCES;
708
709                         /*
710                          *      Abort the current command on the
711                          *      group if there is one, taking
712                          *      care not to allow anything else
713                          *      to be queued and to die on the
714                          *      spot if we miss one somehow
715                          */
716
717                         spin_lock_irqsave(&ide_lock, flags);
718
719                         if (HWGROUP(drive)->resetting) {
720                                 spin_unlock_irqrestore(&ide_lock, flags);
721                                 return -EBUSY;
722                         }
723
724                         ide_abort(drive, "drive reset");
725
726                         BUG_ON(HWGROUP(drive)->handler);
727
728                         /* Ensure nothing gets queued after we
729                            drop the lock. Reset will clear the busy */
730
731                         HWGROUP(drive)->busy = 1;
732                         spin_unlock_irqrestore(&ide_lock, flags);
733                         (void) ide_do_reset(drive);
734
735                         return 0;
736                 case HDIO_GET_BUSSTATE:
737                         if (!capable(CAP_SYS_ADMIN))
738                                 return -EACCES;
739                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
740                                 return -EFAULT;
741                         return 0;
742
743                 case HDIO_SET_BUSSTATE:
744                         if (!capable(CAP_SYS_ADMIN))
745                                 return -EACCES;
746                         return -EOPNOTSUPP;
747                 default:
748                         return -EINVAL;
749         }
750
751 read_val:
752         mutex_lock(&ide_setting_mtx);
753         spin_lock_irqsave(&ide_lock, flags);
754         err = *val;
755         spin_unlock_irqrestore(&ide_lock, flags);
756         mutex_unlock(&ide_setting_mtx);
757         return err >= 0 ? put_user(err, (long __user *)arg) : err;
758
759 set_val:
760         if (bdev != bdev->bd_contains)
761                 err = -EINVAL;
762         else {
763                 if (!capable(CAP_SYS_ADMIN))
764                         err = -EACCES;
765                 else {
766                         mutex_lock(&ide_setting_mtx);
767                         err = setfunc(drive, arg);
768                         mutex_unlock(&ide_setting_mtx);
769                 }
770         }
771         return err;
772 }
773
774 EXPORT_SYMBOL(generic_ide_ioctl);
775
776 /*
777  * stridx() returns the offset of c within s,
778  * or -1 if c is '\0' or not found within s.
779  */
780 static int __init stridx (const char *s, char c)
781 {
782         char *i = strchr(s, c);
783         return (i && c) ? i - s : -1;
784 }
785
786 /*
787  * match_parm() does parsing for ide_setup():
788  *
789  * 1. the first char of s must be '='.
790  * 2. if the remainder matches one of the supplied keywords,
791  *     the index (1 based) of the keyword is negated and returned.
792  * 3. if the remainder is a series of no more than max_vals numbers
793  *     separated by commas, the numbers are saved in vals[] and a
794  *     count of how many were saved is returned.  Base10 is assumed,
795  *     and base16 is allowed when prefixed with "0x".
796  * 4. otherwise, zero is returned.
797  */
798 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
799 {
800         static const char *decimal = "0123456789";
801         static const char *hex = "0123456789abcdef";
802         int i, n;
803
804         if (*s++ == '=') {
805                 /*
806                  * Try matching against the supplied keywords,
807                  * and return -(index+1) if we match one
808                  */
809                 if (keywords != NULL) {
810                         for (i = 0; *keywords != NULL; ++i) {
811                                 if (!strcmp(s, *keywords++))
812                                         return -(i+1);
813                         }
814                 }
815                 /*
816                  * Look for a series of no more than "max_vals"
817                  * numeric values separated by commas, in base10,
818                  * or base16 when prefixed with "0x".
819                  * Return a count of how many were found.
820                  */
821                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
822                         vals[n] = i;
823                         while ((i = stridx(decimal, *++s)) >= 0)
824                                 vals[n] = (vals[n] * 10) + i;
825                         if (*s == 'x' && !vals[n]) {
826                                 while ((i = stridx(hex, *++s)) >= 0)
827                                         vals[n] = (vals[n] * 0x10) + i;
828                         }
829                         if (++n == max_vals)
830                                 break;
831                         if (*s == ',' || *s == ';')
832                                 ++s;
833                 }
834                 if (!*s)
835                         return n;
836         }
837         return 0;       /* zero = nothing matched */
838 }
839
840 extern int probe_ali14xx;
841 extern int probe_umc8672;
842 extern int probe_dtc2278;
843 extern int probe_ht6560b;
844 extern int probe_qd65xx;
845 extern int cmd640_vlb;
846 extern int probe_4drives;
847
848 static int __initdata is_chipset_set;
849
850 /*
851  * ide_setup() gets called VERY EARLY during initialization,
852  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
853  *
854  * Remember to update Documentation/ide/ide.txt if you change something here.
855  */
856 static int __init ide_setup(char *s)
857 {
858         int i, vals[3];
859         ide_hwif_t *hwif;
860         ide_drive_t *drive;
861         unsigned int hw, unit;
862         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
863         const char max_hwif  = '0' + (MAX_HWIFS - 1);
864
865         
866         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
867                 return 0;                               /* driver and not us */
868
869         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
870                 return 0;
871
872         printk(KERN_INFO "ide_setup: %s", s);
873         init_ide_data ();
874
875 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
876         if (!strcmp(s, "ide=doubler")) {
877                 extern int ide_doubler;
878
879                 printk(" : Enabled support for IDE doublers\n");
880                 ide_doubler = 1;
881                 return 1;
882         }
883 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
884
885         if (!strcmp(s, "ide=nodma")) {
886                 printk(" : Prevented DMA\n");
887                 noautodma = 1;
888                 goto obsolete_option;
889         }
890
891 #ifdef CONFIG_BLK_DEV_IDEACPI
892         if (!strcmp(s, "ide=noacpi")) {
893                 //printk(" : Disable IDE ACPI support.\n");
894                 ide_noacpi = 1;
895                 return 1;
896         }
897         if (!strcmp(s, "ide=acpigtf")) {
898                 //printk(" : Enable IDE ACPI _GTF support.\n");
899                 ide_noacpitfs = 0;
900                 return 1;
901         }
902         if (!strcmp(s, "ide=acpionboot")) {
903                 //printk(" : Call IDE ACPI methods on boot.\n");
904                 ide_noacpionboot = 0;
905                 return 1;
906         }
907 #endif /* CONFIG_BLK_DEV_IDEACPI */
908
909         /*
910          * Look for drive options:  "hdx="
911          */
912         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
913                 const char *hd_words[] = {
914                         "none", "noprobe", "nowerr", "cdrom", "nodma",
915                         "autotune", "noautotune", "-8", "-9", "-10",
916                         "noflush", "remap", "remap63", "scsi", NULL };
917                 unit = s[2] - 'a';
918                 hw   = unit / MAX_DRIVES;
919                 unit = unit % MAX_DRIVES;
920                 hwif = &ide_hwifs[hw];
921                 drive = &hwif->drives[unit];
922                 if (strncmp(s + 4, "ide-", 4) == 0) {
923                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
924                         goto obsolete_option;
925                 }
926                 switch (match_parm(&s[3], hd_words, vals, 3)) {
927                         case -1: /* "none" */
928                         case -2: /* "noprobe" */
929                                 drive->noprobe = 1;
930                                 goto done;
931                         case -3: /* "nowerr" */
932                                 drive->bad_wstat = BAD_R_STAT;
933                                 goto done;
934                         case -4: /* "cdrom" */
935                                 drive->present = 1;
936                                 drive->media = ide_cdrom;
937                                 /* an ATAPI device ignores DRDY */
938                                 drive->ready_stat = 0;
939                                 goto done;
940                         case -5: /* nodma */
941                                 drive->nodma = 1;
942                                 goto done;
943                         case -6: /* "autotune" */
944                                 drive->autotune = IDE_TUNE_AUTO;
945                                 goto obsolete_option;
946                         case -7: /* "noautotune" */
947                                 drive->autotune = IDE_TUNE_NOAUTO;
948                                 goto obsolete_option;
949                         case -11: /* noflush */
950                                 drive->noflush = 1;
951                                 goto done;
952                         case -12: /* "remap" */
953                                 drive->remap_0_to_1 = 1;
954                                 goto obsolete_option;
955                         case -13: /* "remap63" */
956                                 drive->sect0 = 63;
957                                 goto obsolete_option;
958                         case -14: /* "scsi" */
959                                 drive->scsi = 1;
960                                 goto obsolete_option;
961                         case 3: /* cyl,head,sect */
962                                 drive->media    = ide_disk;
963                                 drive->ready_stat = READY_STAT;
964                                 drive->cyl      = drive->bios_cyl  = vals[0];
965                                 drive->head     = drive->bios_head = vals[1];
966                                 drive->sect     = drive->bios_sect = vals[2];
967                                 drive->present  = 1;
968                                 drive->forced_geom = 1;
969                                 goto done;
970                         default:
971                                 goto bad_option;
972                 }
973         }
974
975         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
976                 goto bad_option;
977         /*
978          * Look for bus speed option:  "idebus="
979          */
980         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
981                 if (match_parm(&s[6], NULL, vals, 1) != 1)
982                         goto bad_option;
983                 if (vals[0] >= 20 && vals[0] <= 66) {
984                         idebus_parameter = vals[0];
985                 } else
986                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
987                 goto done;
988         }
989         /*
990          * Look for interface options:  "idex="
991          */
992         if (s[3] >= '0' && s[3] <= max_hwif) {
993                 /*
994                  * Be VERY CAREFUL changing this: note hardcoded indexes below
995                  * (-8, -9, -10) are reserved to ease the hardcoding.
996                  */
997                 static const char *ide_words[] = {
998                         "minus1", "minus2", "minus3", "minus4",
999                         "reset", "minus6", "ata66", "minus8", "minus9",
1000                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1001                         "dtc2278", "umc8672", "ali14xx", NULL };
1002
1003                 hw = s[3] - '0';
1004                 hwif = &ide_hwifs[hw];
1005                 i = match_parm(&s[4], ide_words, vals, 3);
1006
1007                 /*
1008                  * Cryptic check to ensure chipset not already set for hwif.
1009                  * Note: we can't depend on hwif->chipset here.
1010                  */
1011                 if (i >= -18 && i <= -11) {
1012                         /* chipset already specified */
1013                         if (is_chipset_set)
1014                                 goto bad_option;
1015                         /* these drivers are for "ide0=" only */
1016                         if (hw != 0)
1017                                 goto bad_hwif;
1018                         is_chipset_set = 1;
1019                         printk("\n");
1020                 }
1021
1022                 switch (i) {
1023 #ifdef CONFIG_BLK_DEV_ALI14XX
1024                         case -17: /* "ali14xx" */
1025                                 probe_ali14xx = 1;
1026                                 goto obsolete_option;
1027 #endif
1028 #ifdef CONFIG_BLK_DEV_UMC8672
1029                         case -16: /* "umc8672" */
1030                                 probe_umc8672 = 1;
1031                                 goto obsolete_option;
1032 #endif
1033 #ifdef CONFIG_BLK_DEV_DTC2278
1034                         case -15: /* "dtc2278" */
1035                                 probe_dtc2278 = 1;
1036                                 goto obsolete_option;
1037 #endif
1038 #ifdef CONFIG_BLK_DEV_CMD640
1039                         case -14: /* "cmd640_vlb" */
1040                                 cmd640_vlb = 1;
1041                                 goto obsolete_option;
1042 #endif
1043 #ifdef CONFIG_BLK_DEV_HT6560B
1044                         case -13: /* "ht6560b" */
1045                                 probe_ht6560b = 1;
1046                                 goto obsolete_option;
1047 #endif
1048 #ifdef CONFIG_BLK_DEV_QD65XX
1049                         case -12: /* "qd65xx" */
1050                                 probe_qd65xx = 1;
1051                                 goto obsolete_option;
1052 #endif
1053 #ifdef CONFIG_BLK_DEV_4DRIVES
1054                         case -11: /* "four" drives on one set of ports */
1055                                 probe_4drives = 1;
1056                                 goto obsolete_option;
1057 #endif
1058                         case -10: /* minus10 */
1059                         case -9: /* minus9 */
1060                         case -8: /* minus8 */
1061                         case -6:
1062                         case -4:
1063                         case -3:
1064                                 goto bad_option;
1065                         case -7: /* ata66 */
1066 #ifdef CONFIG_BLK_DEV_IDEPCI
1067                                 /*
1068                                  * Use ATA_CBL_PATA40_SHORT so drive side
1069                                  * cable detection is also overriden.
1070                                  */
1071                                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1072                                 goto obsolete_option;
1073 #else
1074                                 goto bad_hwif;
1075 #endif
1076                         case -5: /* "reset" */
1077                                 hwif->reset = 1;
1078                                 goto obsolete_option;
1079                         case -2:
1080                         case -1:
1081                         case 0:
1082                         case 1:
1083                         case 2:
1084                         case 3:
1085                                 goto bad_option;
1086                         default:
1087                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1088                                 return 1;
1089                 }
1090         }
1091 bad_option:
1092         printk(" -- BAD OPTION\n");
1093         return 1;
1094 obsolete_option:
1095         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1096         return 1;
1097 bad_hwif:
1098         printk("-- NOT SUPPORTED ON ide%d", hw);
1099 done:
1100         printk("\n");
1101         return 1;
1102 }
1103
1104 EXPORT_SYMBOL(ide_lock);
1105
1106 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1107 {
1108         return 1;
1109 }
1110
1111 static char *media_string(ide_drive_t *drive)
1112 {
1113         switch (drive->media) {
1114         case ide_disk:
1115                 return "disk";
1116         case ide_cdrom:
1117                 return "cdrom";
1118         case ide_tape:
1119                 return "tape";
1120         case ide_floppy:
1121                 return "floppy";
1122         case ide_optical:
1123                 return "optical";
1124         default:
1125                 return "UNKNOWN";
1126         }
1127 }
1128
1129 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1130 {
1131         ide_drive_t *drive = to_ide_device(dev);
1132         return sprintf(buf, "%s\n", media_string(drive));
1133 }
1134
1135 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1136 {
1137         ide_drive_t *drive = to_ide_device(dev);
1138         return sprintf(buf, "%s\n", drive->name);
1139 }
1140
1141 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1142 {
1143         ide_drive_t *drive = to_ide_device(dev);
1144         return sprintf(buf, "ide:m-%s\n", media_string(drive));
1145 }
1146
1147 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
1148                           char *buf)
1149 {
1150         ide_drive_t *drive = to_ide_device(dev);
1151         return sprintf(buf, "%s\n", drive->id->model);
1152 }
1153
1154 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
1155                              char *buf)
1156 {
1157         ide_drive_t *drive = to_ide_device(dev);
1158         return sprintf(buf, "%s\n", drive->id->fw_rev);
1159 }
1160
1161 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
1162                            char *buf)
1163 {
1164         ide_drive_t *drive = to_ide_device(dev);
1165         return sprintf(buf, "%s\n", drive->id->serial_no);
1166 }
1167
1168 static struct device_attribute ide_dev_attrs[] = {
1169         __ATTR_RO(media),
1170         __ATTR_RO(drivename),
1171         __ATTR_RO(modalias),
1172         __ATTR_RO(model),
1173         __ATTR_RO(firmware),
1174         __ATTR(serial, 0400, serial_show, NULL),
1175         __ATTR_NULL
1176 };
1177
1178 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
1179 {
1180         ide_drive_t *drive = to_ide_device(dev);
1181
1182         add_uevent_var(env, "MEDIA=%s", media_string(drive));
1183         add_uevent_var(env, "DRIVENAME=%s", drive->name);
1184         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
1185         return 0;
1186 }
1187
1188 static int generic_ide_probe(struct device *dev)
1189 {
1190         ide_drive_t *drive = to_ide_device(dev);
1191         ide_driver_t *drv = to_ide_driver(dev->driver);
1192
1193         return drv->probe ? drv->probe(drive) : -ENODEV;
1194 }
1195
1196 static int generic_ide_remove(struct device *dev)
1197 {
1198         ide_drive_t *drive = to_ide_device(dev);
1199         ide_driver_t *drv = to_ide_driver(dev->driver);
1200
1201         if (drv->remove)
1202                 drv->remove(drive);
1203
1204         return 0;
1205 }
1206
1207 static void generic_ide_shutdown(struct device *dev)
1208 {
1209         ide_drive_t *drive = to_ide_device(dev);
1210         ide_driver_t *drv = to_ide_driver(dev->driver);
1211
1212         if (dev->driver && drv->shutdown)
1213                 drv->shutdown(drive);
1214 }
1215
1216 struct bus_type ide_bus_type = {
1217         .name           = "ide",
1218         .match          = ide_bus_match,
1219         .uevent         = ide_uevent,
1220         .probe          = generic_ide_probe,
1221         .remove         = generic_ide_remove,
1222         .shutdown       = generic_ide_shutdown,
1223         .dev_attrs      = ide_dev_attrs,
1224         .suspend        = generic_ide_suspend,
1225         .resume         = generic_ide_resume,
1226 };
1227
1228 EXPORT_SYMBOL_GPL(ide_bus_type);
1229
1230 static void ide_port_class_release(struct device *portdev)
1231 {
1232         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1233
1234         put_device(&hwif->gendev);
1235 }
1236
1237 static unsigned int ide_ignore_cable;
1238
1239 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
1240 {
1241         int i, j = 1;
1242
1243         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
1244                 return -EINVAL;
1245
1246         if (i >= MAX_HWIFS || j < 0 || j > 1)
1247                 return -EINVAL;
1248
1249         if (j)
1250                 ide_ignore_cable |= (1 << i);
1251         else
1252                 ide_ignore_cable &= (1 << i);
1253
1254         return 0;
1255 }
1256
1257 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
1258 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
1259
1260 void ide_port_apply_params(ide_hwif_t *hwif)
1261 {
1262         if (ide_ignore_cable & (1 << hwif->index)) {
1263                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
1264                                  hwif->name);
1265                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1266         }
1267 }
1268
1269 /*
1270  * This is gets invoked once during initialization, to set *everything* up
1271  */
1272 static int __init ide_init(void)
1273 {
1274         int ret;
1275
1276         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
1277         system_bus_speed = ide_system_bus_speed();
1278
1279         printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
1280                          "for PIO modes%s\n", system_bus_speed,
1281                         idebus_parameter ? "" : "; override with idebus=xx");
1282
1283         ret = bus_register(&ide_bus_type);
1284         if (ret < 0) {
1285                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1286                 return ret;
1287         }
1288
1289         ide_port_class = class_create(THIS_MODULE, "ide_port");
1290         if (IS_ERR(ide_port_class)) {
1291                 ret = PTR_ERR(ide_port_class);
1292                 goto out_port_class;
1293         }
1294         ide_port_class->dev_release = ide_port_class_release;
1295
1296         init_ide_data();
1297
1298         proc_ide_create();
1299
1300         return 0;
1301
1302 out_port_class:
1303         bus_unregister(&ide_bus_type);
1304
1305         return ret;
1306 }
1307
1308 #ifdef MODULE
1309 static char *options = NULL;
1310 module_param(options, charp, 0);
1311 MODULE_LICENSE("GPL");
1312
1313 static void __init parse_options (char *line)
1314 {
1315         char *next = line;
1316
1317         if (line == NULL || !*line)
1318                 return;
1319         while ((line = next) != NULL) {
1320                 if ((next = strchr(line,' ')) != NULL)
1321                         *next++ = 0;
1322                 if (!ide_setup(line))
1323                         printk (KERN_INFO "Unknown option '%s'\n", line);
1324         }
1325 }
1326
1327 int __init init_module (void)
1328 {
1329         parse_options(options);
1330         return ide_init();
1331 }
1332
1333 void __exit cleanup_module (void)
1334 {
1335         int index;
1336
1337         for (index = 0; index < MAX_HWIFS; ++index)
1338                 ide_unregister(index);
1339
1340         proc_ide_destroy();
1341
1342         class_destroy(ide_port_class);
1343
1344         bus_unregister(&ide_bus_type);
1345 }
1346
1347 #else /* !MODULE */
1348
1349 __setup("", ide_setup);
1350
1351 module_init(ide_init);
1352
1353 #endif /* MODULE */