Driver core: convert block from raw kobjects to core devices
[linux-2.6.git] / drivers / ide / ide-probe.c
1 /*
2  *  linux/drivers/ide/ide-probe.c       Version 1.11    Mar 05, 2003
3  *
4  *  Copyright (C) 1994-1998  Linus Torvalds & authors (see below)
5  */
6
7 /*
8  *  Mostly written by Mark Lord <mlord@pobox.com>
9  *                and Gadi Oxman <gadio@netvision.net.il>
10  *                and Andre Hedrick <andre@linux-ide.org>
11  *
12  *  See linux/MAINTAINERS for address of current maintainer.
13  *
14  * This is the IDE probe module, as evolved from hd.c and ide.c.
15  *
16  * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
17  *       by Andrea Arcangeli
18  */
19
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/string.h>
23 #include <linux/kernel.h>
24 #include <linux/timer.h>
25 #include <linux/mm.h>
26 #include <linux/interrupt.h>
27 #include <linux/major.h>
28 #include <linux/errno.h>
29 #include <linux/genhd.h>
30 #include <linux/slab.h>
31 #include <linux/delay.h>
32 #include <linux/ide.h>
33 #include <linux/spinlock.h>
34 #include <linux/kmod.h>
35 #include <linux/pci.h>
36 #include <linux/scatterlist.h>
37
38 #include <asm/byteorder.h>
39 #include <asm/irq.h>
40 #include <asm/uaccess.h>
41 #include <asm/io.h>
42
43 /**
44  *      generic_id              -       add a generic drive id
45  *      @drive: drive to make an ID block for
46  *      
47  *      Add a fake id field to the drive we are passed. This allows
48  *      use to skip a ton of NULL checks (which people always miss) 
49  *      and make drive properties unconditional outside of this file
50  */
51  
52 static void generic_id(ide_drive_t *drive)
53 {
54         drive->id->cyls = drive->cyl;
55         drive->id->heads = drive->head;
56         drive->id->sectors = drive->sect;
57         drive->id->cur_cyls = drive->cyl;
58         drive->id->cur_heads = drive->head;
59         drive->id->cur_sectors = drive->sect;
60 }
61
62 static void ide_disk_init_chs(ide_drive_t *drive)
63 {
64         struct hd_driveid *id = drive->id;
65
66         /* Extract geometry if we did not already have one for the drive */
67         if (!drive->cyl || !drive->head || !drive->sect) {
68                 drive->cyl  = drive->bios_cyl  = id->cyls;
69                 drive->head = drive->bios_head = id->heads;
70                 drive->sect = drive->bios_sect = id->sectors;
71         }
72
73         /* Handle logical geometry translation by the drive */
74         if ((id->field_valid & 1) && id->cur_cyls &&
75             id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
76                 drive->cyl  = id->cur_cyls;
77                 drive->head = id->cur_heads;
78                 drive->sect = id->cur_sectors;
79         }
80
81         /* Use physical geometry if what we have still makes no sense */
82         if (drive->head > 16 && id->heads && id->heads <= 16) {
83                 drive->cyl  = id->cyls;
84                 drive->head = id->heads;
85                 drive->sect = id->sectors;
86         }
87 }
88
89 static void ide_disk_init_mult_count(ide_drive_t *drive)
90 {
91         struct hd_driveid *id = drive->id;
92
93         drive->mult_count = 0;
94         if (id->max_multsect) {
95 #ifdef CONFIG_IDEDISK_MULTI_MODE
96                 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
97                 id->multsect_valid = id->multsect ? 1 : 0;
98                 drive->mult_req = id->multsect_valid ? id->max_multsect : INITIAL_MULT_COUNT;
99                 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
100 #else   /* original, pre IDE-NFG, per request of AC */
101                 drive->mult_req = INITIAL_MULT_COUNT;
102                 if (drive->mult_req > id->max_multsect)
103                         drive->mult_req = id->max_multsect;
104                 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
105                         drive->special.b.set_multmode = 1;
106 #endif
107         }
108 }
109
110 /**
111  *      do_identify     -       identify a drive
112  *      @drive: drive to identify 
113  *      @cmd: command used
114  *
115  *      Called when we have issued a drive identify command to
116  *      read and parse the results. This function is run with
117  *      interrupts disabled. 
118  */
119  
120 static inline void do_identify (ide_drive_t *drive, u8 cmd)
121 {
122         ide_hwif_t *hwif = HWIF(drive);
123         int bswap = 1;
124         struct hd_driveid *id;
125
126         id = drive->id;
127         /* read 512 bytes of id info */
128         hwif->ata_input_data(drive, id, SECTOR_WORDS);
129
130         drive->id_read = 1;
131         local_irq_enable();
132         ide_fix_driveid(id);
133
134 #if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
135         /*
136          * EATA SCSI controllers do a hardware ATA emulation:
137          * Ignore them if there is a driver for them available.
138          */
139         if ((id->model[0] == 'P' && id->model[1] == 'M') ||
140             (id->model[0] == 'S' && id->model[1] == 'K')) {
141                 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
142                 goto err_misc;
143         }
144 #endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
145
146         /*
147          *  WIN_IDENTIFY returns little-endian info,
148          *  WIN_PIDENTIFY *usually* returns little-endian info.
149          */
150         if (cmd == WIN_PIDENTIFY) {
151                 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
152                  || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
153                  || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
154                         /* Vertos drives may still be weird */
155                         bswap ^= 1;     
156         }
157         ide_fixstring(id->model,     sizeof(id->model),     bswap);
158         ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
159         ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
160
161         /* we depend on this a lot! */
162         id->model[sizeof(id->model)-1] = '\0';
163
164         if (strstr(id->model, "E X A B Y T E N E S T"))
165                 goto err_misc;
166
167         printk("%s: %s, ", drive->name, id->model);
168         drive->present = 1;
169         drive->dead = 0;
170
171         /*
172          * Check for an ATAPI device
173          */
174         if (cmd == WIN_PIDENTIFY) {
175                 u8 type = (id->config >> 8) & 0x1f;
176                 printk("ATAPI ");
177                 switch (type) {
178                         case ide_floppy:
179                                 if (!strstr(id->model, "CD-ROM")) {
180                                         if (!strstr(id->model, "oppy") &&
181                                             !strstr(id->model, "poyp") &&
182                                             !strstr(id->model, "ZIP"))
183                                                 printk("cdrom or floppy?, assuming ");
184                                         if (drive->media != ide_cdrom) {
185                                                 printk ("FLOPPY");
186                                                 drive->removable = 1;
187                                                 break;
188                                         }
189                                 }
190                                 /* Early cdrom models used zero */
191                                 type = ide_cdrom;
192                         case ide_cdrom:
193                                 drive->removable = 1;
194 #ifdef CONFIG_PPC
195                                 /* kludge for Apple PowerBook internal zip */
196                                 if (!strstr(id->model, "CD-ROM") &&
197                                     strstr(id->model, "ZIP")) {
198                                         printk ("FLOPPY");
199                                         type = ide_floppy;
200                                         break;
201                                 }
202 #endif
203                                 printk ("CD/DVD-ROM");
204                                 break;
205                         case ide_tape:
206                                 printk ("TAPE");
207                                 break;
208                         case ide_optical:
209                                 printk ("OPTICAL");
210                                 drive->removable = 1;
211                                 break;
212                         default:
213                                 printk("UNKNOWN (type %d)", type);
214                                 break;
215                 }
216                 printk (" drive\n");
217                 drive->media = type;
218                 /* an ATAPI device ignores DRDY */
219                 drive->ready_stat = 0;
220                 return;
221         }
222
223         /*
224          * Not an ATAPI device: looks like a "regular" hard disk
225          */
226
227         /*
228          * 0x848a = CompactFlash device
229          * These are *not* removable in Linux definition of the term
230          */
231
232         if ((id->config != 0x848a) && (id->config & (1<<7)))
233                 drive->removable = 1;
234
235         drive->media = ide_disk;
236         printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
237         QUIRK_LIST(drive);
238         return;
239
240 err_misc:
241         kfree(id);
242         drive->present = 0;
243         return;
244 }
245
246 /**
247  *      actual_try_to_identify  -       send ata/atapi identify
248  *      @drive: drive to identify
249  *      @cmd: command to use
250  *
251  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
252  *      and waits for a response.  It also monitors irqs while this is
253  *      happening, in hope of automatically determining which one is
254  *      being used by the interface.
255  *
256  *      Returns:        0  device was identified
257  *                      1  device timed-out (no response to identify request)
258  *                      2  device aborted the command (refused to identify itself)
259  */
260
261 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
262 {
263         ide_hwif_t *hwif = HWIF(drive);
264         int rc;
265         unsigned long hd_status;
266         unsigned long timeout;
267         u8 s = 0, a = 0;
268
269         /* take a deep breath */
270         msleep(50);
271
272         if (IDE_CONTROL_REG) {
273                 a = hwif->INB(IDE_ALTSTATUS_REG);
274                 s = hwif->INB(IDE_STATUS_REG);
275                 if ((a ^ s) & ~INDEX_STAT) {
276                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
277                                 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
278                         /* ancient Seagate drives, broken interfaces */
279                         hd_status = IDE_STATUS_REG;
280                 } else {
281                         /* use non-intrusive polling */
282                         hd_status = IDE_ALTSTATUS_REG;
283                 }
284         } else
285                 hd_status = IDE_STATUS_REG;
286
287         /* set features register for atapi
288          * identify command to be sure of reply
289          */
290         if ((cmd == WIN_PIDENTIFY))
291                 /* disable dma & overlap */
292                 hwif->OUTB(0, IDE_FEATURE_REG);
293
294         /* ask drive for ID */
295         hwif->OUTB(cmd, IDE_COMMAND_REG);
296
297         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
298         timeout += jiffies;
299         do {
300                 if (time_after(jiffies, timeout)) {
301                         /* drive timed-out */
302                         return 1;
303                 }
304                 /* give drive a breather */
305                 msleep(50);
306         } while ((hwif->INB(hd_status)) & BUSY_STAT);
307
308         /* wait for IRQ and DRQ_STAT */
309         msleep(50);
310         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
311                 unsigned long flags;
312
313                 /* local CPU only; some systems need this */
314                 local_irq_save(flags);
315                 /* drive returned ID */
316                 do_identify(drive, cmd);
317                 /* drive responded with ID */
318                 rc = 0;
319                 /* clear drive IRQ */
320                 (void) hwif->INB(IDE_STATUS_REG);
321                 local_irq_restore(flags);
322         } else {
323                 /* drive refused ID */
324                 rc = 2;
325         }
326         return rc;
327 }
328
329 /**
330  *      try_to_identify -       try to identify a drive
331  *      @drive: drive to probe
332  *      @cmd: command to use
333  *
334  *      Issue the identify command and then do IRQ probing to
335  *      complete the identification when needed by finding the
336  *      IRQ the drive is attached to
337  */
338  
339 static int try_to_identify (ide_drive_t *drive, u8 cmd)
340 {
341         ide_hwif_t *hwif = HWIF(drive);
342         int retval;
343         int autoprobe = 0;
344         unsigned long cookie = 0;
345
346         /*
347          * Disable device irq unless we need to
348          * probe for it. Otherwise we'll get spurious
349          * interrupts during the identify-phase that
350          * the irq handler isn't expecting.
351          */
352         if (IDE_CONTROL_REG) {
353                 u8 ctl = drive->ctl | 2;
354                 if (!hwif->irq) {
355                         autoprobe = 1;
356                         cookie = probe_irq_on();
357                         /* enable device irq */
358                         ctl &= ~2;
359                 }
360                 hwif->OUTB(ctl, IDE_CONTROL_REG);
361         }
362
363         retval = actual_try_to_identify(drive, cmd);
364
365         if (autoprobe) {
366                 int irq;
367                 /* mask device irq */
368                 hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
369                 /* clear drive IRQ */
370                 (void) hwif->INB(IDE_STATUS_REG);
371                 udelay(5);
372                 irq = probe_irq_off(cookie);
373                 if (!hwif->irq) {
374                         if (irq > 0) {
375                                 hwif->irq = irq;
376                         } else {
377                                 /* Mmmm.. multiple IRQs..
378                                  * don't know which was ours
379                                  */
380                                 printk("%s: IRQ probe failed (0x%lx)\n",
381                                         drive->name, cookie);
382                         }
383                 }
384         }
385         return retval;
386 }
387
388
389 /**
390  *      do_probe                -       probe an IDE device
391  *      @drive: drive to probe
392  *      @cmd: command to use
393  *
394  *      do_probe() has the difficult job of finding a drive if it exists,
395  *      without getting hung up if it doesn't exist, without trampling on
396  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
397  *
398  *      If a drive is "known" to exist (from CMOS or kernel parameters),
399  *      but does not respond right away, the probe will "hang in there"
400  *      for the maximum wait time (about 30 seconds), otherwise it will
401  *      exit much more quickly.
402  *
403  * Returns:     0  device was identified
404  *              1  device timed-out (no response to identify request)
405  *              2  device aborted the command (refused to identify itself)
406  *              3  bad status from device (possible for ATAPI drives)
407  *              4  probe was not attempted because failure was obvious
408  */
409
410 static int do_probe (ide_drive_t *drive, u8 cmd)
411 {
412         int rc;
413         ide_hwif_t *hwif = HWIF(drive);
414
415         if (drive->present) {
416                 /* avoid waiting for inappropriate probes */
417                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
418                         return 4;
419         }
420 #ifdef DEBUG
421         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
422                 drive->name, drive->present, drive->media,
423                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
424 #endif
425
426         /* needed for some systems
427          * (e.g. crw9624 as drive0 with disk as slave)
428          */
429         msleep(50);
430         SELECT_DRIVE(drive);
431         msleep(50);
432         if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
433                 if (drive->select.b.unit != 0) {
434                         /* exit with drive0 selected */
435                         SELECT_DRIVE(&hwif->drives[0]);
436                         /* allow BUSY_STAT to assert & clear */
437                         msleep(50);
438                 }
439                 /* no i/f present: mmm.. this should be a 4 -ml */
440                 return 3;
441         }
442
443         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
444             drive->present || cmd == WIN_PIDENTIFY) {
445                 /* send cmd and wait */
446                 if ((rc = try_to_identify(drive, cmd))) {
447                         /* failed: try again */
448                         rc = try_to_identify(drive,cmd);
449                 }
450                 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
451                         return 4;
452
453                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
454                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
455                         (drive->autotune == IDE_TUNE_AUTO))) {
456                         unsigned long timeout;
457                         printk("%s: no response (status = 0x%02x), "
458                                 "resetting drive\n", drive->name,
459                                 hwif->INB(IDE_STATUS_REG));
460                         msleep(50);
461                         hwif->OUTB(drive->select.all, IDE_SELECT_REG);
462                         msleep(50);
463                         hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
464                         timeout = jiffies;
465                         while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
466                                time_before(jiffies, timeout + WAIT_WORSTCASE))
467                                 msleep(50);
468                         rc = try_to_identify(drive, cmd);
469                 }
470                 if (rc == 1)
471                         printk("%s: no response (status = 0x%02x)\n",
472                                 drive->name, hwif->INB(IDE_STATUS_REG));
473                 /* ensure drive irq is clear */
474                 (void) hwif->INB(IDE_STATUS_REG);
475         } else {
476                 /* not present or maybe ATAPI */
477                 rc = 3;
478         }
479         if (drive->select.b.unit != 0) {
480                 /* exit with drive0 selected */
481                 SELECT_DRIVE(&hwif->drives[0]);
482                 msleep(50);
483                 /* ensure drive irq is clear */
484                 (void) hwif->INB(IDE_STATUS_REG);
485         }
486         return rc;
487 }
488
489 /*
490  *
491  */
492 static void enable_nest (ide_drive_t *drive)
493 {
494         ide_hwif_t *hwif = HWIF(drive);
495         unsigned long timeout;
496
497         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
498         SELECT_DRIVE(drive);
499         msleep(50);
500         hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
501         timeout = jiffies + WAIT_WORSTCASE;
502         do {
503                 if (time_after(jiffies, timeout)) {
504                         printk("failed (timeout)\n");
505                         return;
506                 }
507                 msleep(50);
508         } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
509
510         msleep(50);
511
512         if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
513                 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
514         } else {
515                 printk("success\n");
516         }
517
518         /* if !(success||timed-out) */
519         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
520                 /* look for ATAPI device */
521                 (void) do_probe(drive, WIN_PIDENTIFY);
522         }
523 }
524
525 /**
526  *      probe_for_drives        -       upper level drive probe
527  *      @drive: drive to probe for
528  *
529  *      probe_for_drive() tests for existence of a given drive using do_probe()
530  *      and presents things to the user as needed.
531  *
532  *      Returns:        0  no device was found
533  *                      1  device was found (note: drive->present might
534  *                         still be 0)
535  */
536  
537 static inline u8 probe_for_drive (ide_drive_t *drive)
538 {
539         /*
540          *      In order to keep things simple we have an id
541          *      block for all drives at all times. If the device
542          *      is pre ATA or refuses ATA/ATAPI identify we
543          *      will add faked data to this.
544          *
545          *      Also note that 0 everywhere means "can't do X"
546          */
547  
548         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
549         drive->id_read = 0;
550         if(drive->id == NULL)
551         {
552                 printk(KERN_ERR "ide: out of memory for id data.\n");
553                 return 0;
554         }
555         strcpy(drive->id->model, "UNKNOWN");
556         
557         /* skip probing? */
558         if (!drive->noprobe)
559         {
560                 /* if !(success||timed-out) */
561                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
562                         /* look for ATAPI device */
563                         (void) do_probe(drive, WIN_PIDENTIFY);
564                 }
565                 if (!drive->present)
566                         /* drive not found */
567                         return 0;
568                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
569                         enable_nest(drive);
570         
571                 /* identification failed? */
572                 if (!drive->id_read) {
573                         if (drive->media == ide_disk) {
574                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
575                                         drive->name, drive->cyl,
576                                         drive->head, drive->sect);
577                         } else if (drive->media == ide_cdrom) {
578                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
579                         } else {
580                                 /* nuke it */
581                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
582                                 drive->present = 0;
583                         }
584                 }
585                 /* drive was found */
586         }
587         if(!drive->present)
588                 return 0;
589         /* The drive wasn't being helpful. Add generic info only */
590         if (drive->id_read == 0) {
591                 generic_id(drive);
592                 return 1;
593         }
594
595         if (drive->media == ide_disk) {
596                 ide_disk_init_chs(drive);
597                 ide_disk_init_mult_count(drive);
598         }
599
600         return drive->present;
601 }
602
603 static void hwif_release_dev (struct device *dev)
604 {
605         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
606
607         complete(&hwif->gendev_rel_comp);
608 }
609
610 static void hwif_register (ide_hwif_t *hwif)
611 {
612         int ret;
613
614         /* register with global device tree */
615         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
616         hwif->gendev.driver_data = hwif;
617         if (hwif->gendev.parent == NULL) {
618                 if (hwif->pci_dev)
619                         hwif->gendev.parent = &hwif->pci_dev->dev;
620                 else
621                         /* Would like to do = &device_legacy */
622                         hwif->gendev.parent = NULL;
623         }
624         hwif->gendev.release = hwif_release_dev;
625         ret = device_register(&hwif->gendev);
626         if (ret < 0)
627                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
628                         __FUNCTION__, ret);
629 }
630
631 static int wait_hwif_ready(ide_hwif_t *hwif)
632 {
633         int unit, rc;
634
635         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
636
637         /* Let HW settle down a bit from whatever init state we
638          * come from */
639         mdelay(2);
640
641         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
642          * I know of at least one disk who takes 31 seconds, I use 35
643          * here to be safe
644          */
645         rc = ide_wait_not_busy(hwif, 35000);
646         if (rc)
647                 return rc;
648
649         /* Now make sure both master & slave are ready */
650         for (unit = 0; unit < MAX_DRIVES; unit++) {
651                 ide_drive_t *drive = &hwif->drives[unit];
652
653                 /* Ignore disks that we will not probe for later. */
654                 if (!drive->noprobe || drive->present) {
655                         SELECT_DRIVE(drive);
656                         if (IDE_CONTROL_REG)
657                                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
658                         mdelay(2);
659                         rc = ide_wait_not_busy(hwif, 35000);
660                         if (rc)
661                                 goto out;
662                 } else
663                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
664                                           drive->name);
665         }
666 out:
667         /* Exit function with master reselected (let's be sane) */
668         if (unit)
669                 SELECT_DRIVE(&hwif->drives[0]);
670
671         return rc;
672 }
673
674 /**
675  *      ide_undecoded_slave     -       look for bad CF adapters
676  *      @hwif: interface
677  *
678  *      Analyse the drives on the interface and attempt to decide if we
679  *      have the same drive viewed twice. This occurs with crap CF adapters
680  *      and PCMCIA sometimes.
681  */
682
683 void ide_undecoded_slave(ide_hwif_t *hwif)
684 {
685         ide_drive_t *drive0 = &hwif->drives[0];
686         ide_drive_t *drive1 = &hwif->drives[1];
687
688         if (drive0->present == 0 || drive1->present == 0)
689                 return;
690
691         /* If the models don't match they are not the same product */
692         if (strcmp(drive0->id->model, drive1->id->model))
693                 return;
694
695         /* Serial numbers do not match */
696         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
697                 return;
698
699         /* No serial number, thankfully very rare for CF */
700         if (drive0->id->serial_no[0] == 0)
701                 return;
702
703         /* Appears to be an IDE flash adapter with decode bugs */
704         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
705
706         drive1->present = 0;
707 }
708
709 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
710
711 /*
712  * This routine only knows how to look for drive units 0 and 1
713  * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
714  */
715 static void probe_hwif(ide_hwif_t *hwif)
716 {
717         unsigned long flags;
718         unsigned int irqd;
719         int unit;
720
721         if (hwif->noprobe)
722                 return;
723
724         if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
725             (ide_hwif_request_regions(hwif))) {
726                 u16 msgout = 0;
727                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
728                         ide_drive_t *drive = &hwif->drives[unit];
729                         if (drive->present) {
730                                 drive->present = 0;
731                                 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
732                                         drive->name);
733                                 msgout = 1;
734                         }
735                 }
736                 if (!msgout)
737                         printk(KERN_ERR "%s: ports already in use, skipping probe\n",
738                                 hwif->name);
739                 return; 
740         }
741
742         /*
743          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
744          * we'll install our IRQ driver much later...
745          */
746         irqd = hwif->irq;
747         if (irqd)
748                 disable_irq(hwif->irq);
749
750         local_irq_set(flags);
751
752         /* This is needed on some PPCs and a bunch of BIOS-less embedded
753          * platforms. Typical cases are:
754          * 
755          *  - The firmware hard reset the disk before booting the kernel,
756          *    the drive is still doing it's poweron-reset sequence, that
757          *    can take up to 30 seconds
758          *  - The firmware does nothing (or no firmware), the device is
759          *    still in POST state (same as above actually).
760          *  - Some CD/DVD/Writer combo drives tend to drive the bus during
761          *    their reset sequence even when they are non-selected slave
762          *    devices, thus preventing discovery of the main HD
763          *    
764          *  Doing this wait-for-busy should not harm any existing configuration
765          *  (at least things won't be worse than what current code does, that
766          *  is blindly go & talk to the drive) and fix some issues like the
767          *  above.
768          *  
769          *  BenH.
770          */
771         if (wait_hwif_ready(hwif) == -EBUSY)
772                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
773
774         /*
775          * Need to probe slave device first to make it release PDIAG-.
776          */
777         for (unit = MAX_DRIVES - 1; unit >= 0; unit--) {
778                 ide_drive_t *drive = &hwif->drives[unit];
779                 drive->dn = (hwif->channel ? 2 : 0) + unit;
780                 (void) probe_for_drive(drive);
781                 if (drive->present && !hwif->present) {
782                         hwif->present = 1;
783                         if (hwif->chipset != ide_4drives ||
784                             !hwif->mate || 
785                             !hwif->mate->present) {
786                                 hwif_register(hwif);
787                         }
788                 }
789         }
790         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
791                 unsigned long timeout = jiffies + WAIT_WORSTCASE;
792                 u8 stat;
793
794                 printk(KERN_WARNING "%s: reset\n", hwif->name);
795                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
796                 udelay(10);
797                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
798                 do {
799                         msleep(50);
800                         stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
801                 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
802
803         }
804         local_irq_restore(flags);
805         /*
806          * Use cached IRQ number. It might be (and is...) changed by probe
807          * code above
808          */
809         if (irqd)
810                 enable_irq(irqd);
811
812         if (!hwif->present) {
813                 ide_hwif_release_regions(hwif);
814                 return;
815         }
816
817         if (hwif->fixup)
818                 hwif->fixup(hwif);
819
820         for (unit = 0; unit < MAX_DRIVES; ++unit) {
821                 ide_drive_t *drive = &hwif->drives[unit];
822
823                 if (drive->present) {
824                         if (drive->autotune == IDE_TUNE_AUTO)
825                                 ide_set_max_pio(drive);
826
827                         if (drive->autotune != IDE_TUNE_DEFAULT &&
828                             drive->autotune != IDE_TUNE_AUTO)
829                                 continue;
830
831                         drive->nice1 = 1;
832
833                         if (hwif->ide_dma_on) {
834                                 /*
835                                  * Force DMAing for the beginning of the check.
836                                  * Some chipsets appear to do interesting
837                                  * things, if not checked and cleared.
838                                  *   PARANOIA!!!
839                                  */
840                                 hwif->dma_off_quietly(drive);
841                                 ide_set_dma(drive);
842                         }
843                 }
844         }
845
846         for (unit = 0; unit < MAX_DRIVES; ++unit) {
847                 ide_drive_t *drive = &hwif->drives[unit];
848
849                 if (hwif->no_io_32bit)
850                         drive->no_io_32bit = 1;
851                 else
852                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
853         }
854 }
855
856 static int hwif_init(ide_hwif_t *hwif);
857 static void hwif_register_devices(ide_hwif_t *hwif);
858
859 static int probe_hwif_init(ide_hwif_t *hwif)
860 {
861         probe_hwif(hwif);
862
863         if (!hwif_init(hwif)) {
864                 printk(KERN_INFO "%s: failed to initialize IDE interface\n",
865                                  hwif->name);
866                 return -1;
867         }
868
869         if (hwif->present)
870                 hwif_register_devices(hwif);
871
872         return 0;
873 }
874
875 #if MAX_HWIFS > 1
876 /*
877  * save_match() is used to simplify logic in init_irq() below.
878  *
879  * A loophole here is that we may not know about a particular
880  * hwif's irq until after that hwif is actually probed/initialized..
881  * This could be a problem for the case where an hwif is on a
882  * dual interface that requires serialization (eg. cmd640) and another
883  * hwif using one of the same irqs is initialized beforehand.
884  *
885  * This routine detects and reports such situations, but does not fix them.
886  */
887 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
888 {
889         ide_hwif_t *m = *match;
890
891         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
892                 if (!new->hwgroup)
893                         return;
894                 printk("%s: potential irq problem with %s and %s\n",
895                         hwif->name, new->name, m->name);
896         }
897         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
898                 *match = new;
899 }
900 #endif /* MAX_HWIFS > 1 */
901
902 /*
903  * init request queue
904  */
905 static int ide_init_queue(ide_drive_t *drive)
906 {
907         struct request_queue *q;
908         ide_hwif_t *hwif = HWIF(drive);
909         int max_sectors = 256;
910         int max_sg_entries = PRD_ENTRIES;
911
912         /*
913          *      Our default set up assumes the normal IDE case,
914          *      that is 64K segmenting, standard PRD setup
915          *      and LBA28. Some drivers then impose their own
916          *      limits and LBA48 we could raise it but as yet
917          *      do not.
918          */
919
920         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
921         if (!q)
922                 return 1;
923
924         q->queuedata = drive;
925         blk_queue_segment_boundary(q, 0xffff);
926
927         if (!hwif->rqsize) {
928                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
929                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
930                         hwif->rqsize = 256;
931                 else
932                         hwif->rqsize = 65536;
933         }
934         if (hwif->rqsize < max_sectors)
935                 max_sectors = hwif->rqsize;
936         blk_queue_max_sectors(q, max_sectors);
937
938 #ifdef CONFIG_PCI
939         /* When we have an IOMMU, we may have a problem where pci_map_sg()
940          * creates segments that don't completely match our boundary
941          * requirements and thus need to be broken up again. Because it
942          * doesn't align properly either, we may actually have to break up
943          * to more segments than what was we got in the first place, a max
944          * worst case is twice as many.
945          * This will be fixed once we teach pci_map_sg() about our boundary
946          * requirements, hopefully soon. *FIXME*
947          */
948         if (!PCI_DMA_BUS_IS_PHYS)
949                 max_sg_entries >>= 1;
950 #endif /* CONFIG_PCI */
951
952         blk_queue_max_hw_segments(q, max_sg_entries);
953         blk_queue_max_phys_segments(q, max_sg_entries);
954
955         /* assign drive queue */
956         drive->queue = q;
957
958         /* needs drive->queue to be set */
959         ide_toggle_bounce(drive, 1);
960
961         return 0;
962 }
963
964 /*
965  * This routine sets up the irq for an ide interface, and creates a new
966  * hwgroup for the irq/hwif if none was previously assigned.
967  *
968  * Much of the code is for correctly detecting/handling irq sharing
969  * and irq serialization situations.  This is somewhat complex because
970  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
971  *
972  * The IRQF_DISABLED in sa_flags means ide_intr() is always entered with
973  * interrupts completely disabled.  This can be bad for interrupt latency,
974  * but anything else has led to problems on some machines.  We re-enable
975  * interrupts as much as we can safely do in most places.
976  */
977 static int init_irq (ide_hwif_t *hwif)
978 {
979         unsigned int index;
980         ide_hwgroup_t *hwgroup;
981         ide_hwif_t *match = NULL;
982
983
984         BUG_ON(in_interrupt());
985         BUG_ON(irqs_disabled());        
986         BUG_ON(hwif == NULL);
987
988         mutex_lock(&ide_cfg_mtx);
989         hwif->hwgroup = NULL;
990 #if MAX_HWIFS > 1
991         /*
992          * Group up with any other hwifs that share our irq(s).
993          */
994         for (index = 0; index < MAX_HWIFS; index++) {
995                 ide_hwif_t *h = &ide_hwifs[index];
996                 if (h->hwgroup) {  /* scan only initialized hwif's */
997                         if (hwif->irq == h->irq) {
998                                 hwif->sharing_irq = h->sharing_irq = 1;
999                                 if (hwif->chipset != ide_pci ||
1000                                     h->chipset != ide_pci) {
1001                                         save_match(hwif, h, &match);
1002                                 }
1003                         }
1004                         if (hwif->serialized) {
1005                                 if (hwif->mate && hwif->mate->irq == h->irq)
1006                                         save_match(hwif, h, &match);
1007                         }
1008                         if (h->serialized) {
1009                                 if (h->mate && hwif->irq == h->mate->irq)
1010                                         save_match(hwif, h, &match);
1011                         }
1012                 }
1013         }
1014 #endif /* MAX_HWIFS > 1 */
1015         /*
1016          * If we are still without a hwgroup, then form a new one
1017          */
1018         if (match) {
1019                 hwgroup = match->hwgroup;
1020                 hwif->hwgroup = hwgroup;
1021                 /*
1022                  * Link us into the hwgroup.
1023                  * This must be done early, do ensure that unexpected_intr
1024                  * can find the hwif and prevent irq storms.
1025                  * No drives are attached to the new hwif, choose_drive
1026                  * can't do anything stupid (yet).
1027                  * Add ourself as the 2nd entry to the hwgroup->hwif
1028                  * linked list, the first entry is the hwif that owns
1029                  * hwgroup->handler - do not change that.
1030                  */
1031                 spin_lock_irq(&ide_lock);
1032                 hwif->next = hwgroup->hwif->next;
1033                 hwgroup->hwif->next = hwif;
1034                 spin_unlock_irq(&ide_lock);
1035         } else {
1036                 hwgroup = kmalloc_node(sizeof(ide_hwgroup_t),
1037                                         GFP_KERNEL | __GFP_ZERO,
1038                                         hwif_to_node(hwif->drives[0].hwif));
1039                 if (!hwgroup)
1040                         goto out_up;
1041
1042                 hwif->hwgroup = hwgroup;
1043
1044                 hwgroup->hwif     = hwif->next = hwif;
1045                 hwgroup->rq       = NULL;
1046                 hwgroup->handler  = NULL;
1047                 hwgroup->drive    = NULL;
1048                 hwgroup->busy     = 0;
1049                 init_timer(&hwgroup->timer);
1050                 hwgroup->timer.function = &ide_timer_expiry;
1051                 hwgroup->timer.data = (unsigned long) hwgroup;
1052         }
1053
1054         /*
1055          * Allocate the irq, if not already obtained for another hwif
1056          */
1057         if (!match || match->irq != hwif->irq) {
1058                 int sa = IRQF_DISABLED;
1059 #if defined(__mc68000__) || defined(CONFIG_APUS)
1060                 sa = IRQF_SHARED;
1061 #endif /* __mc68000__ || CONFIG_APUS */
1062
1063                 if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
1064                         sa = IRQF_SHARED;
1065 #ifndef CONFIG_IDEPCI_SHARE_IRQ
1066                         sa |= IRQF_DISABLED;
1067 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
1068                 }
1069
1070                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1071                         /* clear nIEN */
1072                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1073
1074                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1075                         goto out_unlink;
1076         }
1077
1078         /*
1079          * For any present drive:
1080          * - allocate the block device queue
1081          * - link drive into the hwgroup
1082          */
1083         for (index = 0; index < MAX_DRIVES; ++index) {
1084                 ide_drive_t *drive = &hwif->drives[index];
1085                 if (!drive->present)
1086                         continue;
1087                 if (ide_init_queue(drive)) {
1088                         printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1089                         continue;
1090                 }
1091                 spin_lock_irq(&ide_lock);
1092                 if (!hwgroup->drive) {
1093                         /* first drive for hwgroup. */
1094                         drive->next = drive;
1095                         hwgroup->drive = drive;
1096                         hwgroup->hwif = HWIF(hwgroup->drive);
1097                 } else {
1098                         drive->next = hwgroup->drive->next;
1099                         hwgroup->drive->next = drive;
1100                 }
1101                 spin_unlock_irq(&ide_lock);
1102         }
1103
1104 #if !defined(__mc68000__) && !defined(CONFIG_APUS)
1105         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1106                 hwif->io_ports[IDE_DATA_OFFSET],
1107                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1108                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1109 #else
1110         printk("%s at 0x%08lx on irq %d", hwif->name,
1111                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1112 #endif /* __mc68000__ && CONFIG_APUS */
1113         if (match)
1114                 printk(" (%sed with %s)",
1115                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1116         printk("\n");
1117         mutex_unlock(&ide_cfg_mtx);
1118         return 0;
1119 out_unlink:
1120         spin_lock_irq(&ide_lock);
1121         if (hwif->next == hwif) {
1122                 BUG_ON(match);
1123                 BUG_ON(hwgroup->hwif != hwif);
1124                 kfree(hwgroup);
1125         } else {
1126                 ide_hwif_t *g;
1127                 g = hwgroup->hwif;
1128                 while (g->next != hwif)
1129                         g = g->next;
1130                 g->next = hwif->next;
1131                 if (hwgroup->hwif == hwif) {
1132                         /* Impossible. */
1133                         printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1134                         hwgroup->hwif = g;
1135                 }
1136                 BUG_ON(hwgroup->hwif == hwif);
1137         }
1138         spin_unlock_irq(&ide_lock);
1139 out_up:
1140         mutex_unlock(&ide_cfg_mtx);
1141         return 1;
1142 }
1143
1144 static int ata_lock(dev_t dev, void *data)
1145 {
1146         /* FIXME: we want to pin hwif down */
1147         return 0;
1148 }
1149
1150 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1151 {
1152         ide_hwif_t *hwif = data;
1153         int unit = *part >> PARTN_BITS;
1154         ide_drive_t *drive = &hwif->drives[unit];
1155         if (!drive->present)
1156                 return NULL;
1157
1158         if (drive->media == ide_disk)
1159                 request_module("ide-disk");
1160         if (drive->scsi)
1161                 request_module("ide-scsi");
1162         if (drive->media == ide_cdrom || drive->media == ide_optical)
1163                 request_module("ide-cd");
1164         if (drive->media == ide_tape)
1165                 request_module("ide-tape");
1166         if (drive->media == ide_floppy)
1167                 request_module("ide-floppy");
1168
1169         return NULL;
1170 }
1171
1172 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1173 {
1174         struct gendisk *p = data;
1175         *part &= (1 << PARTN_BITS) - 1;
1176         return &p->dev.kobj;
1177 }
1178
1179 static int exact_lock(dev_t dev, void *data)
1180 {
1181         struct gendisk *p = data;
1182
1183         if (!get_disk(p))
1184                 return -1;
1185         return 0;
1186 }
1187
1188 void ide_register_region(struct gendisk *disk)
1189 {
1190         blk_register_region(MKDEV(disk->major, disk->first_minor),
1191                             disk->minors, NULL, exact_match, exact_lock, disk);
1192 }
1193
1194 EXPORT_SYMBOL_GPL(ide_register_region);
1195
1196 void ide_unregister_region(struct gendisk *disk)
1197 {
1198         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1199                               disk->minors);
1200 }
1201
1202 EXPORT_SYMBOL_GPL(ide_unregister_region);
1203
1204 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1205 {
1206         ide_hwif_t *hwif = drive->hwif;
1207         unsigned int unit = (drive->select.all >> 4) & 1;
1208
1209         disk->major = hwif->major;
1210         disk->first_minor = unit << PARTN_BITS;
1211         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1212         disk->queue = drive->queue;
1213 }
1214
1215 EXPORT_SYMBOL_GPL(ide_init_disk);
1216
1217 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1218 {
1219         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1220
1221         if (drive == drive->next) {
1222                 /* special case: last drive from hwgroup. */
1223                 BUG_ON(hwgroup->drive != drive);
1224                 hwgroup->drive = NULL;
1225         } else {
1226                 ide_drive_t *walk;
1227
1228                 walk = hwgroup->drive;
1229                 while (walk->next != drive)
1230                         walk = walk->next;
1231                 walk->next = drive->next;
1232                 if (hwgroup->drive == drive) {
1233                         hwgroup->drive = drive->next;
1234                         hwgroup->hwif = hwgroup->drive->hwif;
1235                 }
1236         }
1237         BUG_ON(hwgroup->drive == drive);
1238 }
1239
1240 static void drive_release_dev (struct device *dev)
1241 {
1242         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1243
1244         spin_lock_irq(&ide_lock);
1245         ide_remove_drive_from_hwgroup(drive);
1246         kfree(drive->id);
1247         drive->id = NULL;
1248         drive->present = 0;
1249         /* Messed up locking ... */
1250         spin_unlock_irq(&ide_lock);
1251         blk_cleanup_queue(drive->queue);
1252         spin_lock_irq(&ide_lock);
1253         drive->queue = NULL;
1254         spin_unlock_irq(&ide_lock);
1255
1256         complete(&drive->gendev_rel_comp);
1257 }
1258
1259 /*
1260  * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1261  * after probing for drives, to allocate partition tables and other data
1262  * structures needed for the routines in genhd.c.  ide_geninit() gets called
1263  * somewhat later, during the partition check.
1264  */
1265 static void init_gendisk (ide_hwif_t *hwif)
1266 {
1267         unsigned int unit;
1268
1269         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1270                 ide_drive_t * drive = &hwif->drives[unit];
1271                 ide_add_generic_settings(drive);
1272                 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1273                          hwif->index,unit);
1274                 drive->gendev.parent = &hwif->gendev;
1275                 drive->gendev.bus = &ide_bus_type;
1276                 drive->gendev.driver_data = drive;
1277                 drive->gendev.release = drive_release_dev;
1278         }
1279         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1280                         THIS_MODULE, ata_probe, ata_lock, hwif);
1281 }
1282
1283 static int hwif_init(ide_hwif_t *hwif)
1284 {
1285         int old_irq;
1286
1287         /* Return success if no device is connected */
1288         if (!hwif->present)
1289                 return 1;
1290
1291         if (!hwif->irq) {
1292                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1293                 {
1294                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1295                         return (hwif->present = 0);
1296                 }
1297         }
1298 #ifdef CONFIG_BLK_DEV_HD
1299         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1300                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1301                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1302                 return (hwif->present = 0);
1303         }
1304 #endif /* CONFIG_BLK_DEV_HD */
1305
1306         /* we set it back to 1 if all is ok below */    
1307         hwif->present = 0;
1308
1309         if (register_blkdev(hwif->major, hwif->name))
1310                 return 0;
1311
1312         if (!hwif->sg_max_nents)
1313                 hwif->sg_max_nents = PRD_ENTRIES;
1314
1315         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1316                                  GFP_KERNEL);
1317         if (!hwif->sg_table) {
1318                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1319                 goto out;
1320         }
1321
1322         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1323         
1324         if (init_irq(hwif) == 0)
1325                 goto done;
1326
1327         old_irq = hwif->irq;
1328         /*
1329          *      It failed to initialise. Find the default IRQ for 
1330          *      this port and try that.
1331          */
1332         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1333                 printk("%s: Disabled unable to get IRQ %d.\n",
1334                         hwif->name, old_irq);
1335                 goto out;
1336         }
1337         if (init_irq(hwif)) {
1338                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1339                         hwif->name, old_irq, hwif->irq);
1340                 goto out;
1341         }
1342         printk("%s: probed IRQ %d failed, using default.\n",
1343                 hwif->name, hwif->irq);
1344
1345 done:
1346         init_gendisk(hwif);
1347
1348         ide_acpi_init(hwif);
1349
1350         hwif->present = 1;      /* success */
1351         return 1;
1352
1353 out:
1354         unregister_blkdev(hwif->major, hwif->name);
1355         return 0;
1356 }
1357
1358 static void hwif_register_devices(ide_hwif_t *hwif)
1359 {
1360         unsigned int i;
1361
1362         for (i = 0; i < MAX_DRIVES; i++) {
1363                 ide_drive_t *drive = &hwif->drives[i];
1364
1365                 if (drive->present) {
1366                         int ret = device_register(&drive->gendev);
1367
1368                         if (ret < 0)
1369                                 printk(KERN_WARNING "IDE: %s: "
1370                                         "device_register error: %d\n",
1371                                         __FUNCTION__, ret);
1372                 }
1373         }
1374 }
1375
1376 int ideprobe_init (void)
1377 {
1378         unsigned int index;
1379         int probe[MAX_HWIFS];
1380
1381         memset(probe, 0, MAX_HWIFS * sizeof(int));
1382         for (index = 0; index < MAX_HWIFS; ++index)
1383                 probe[index] = !ide_hwifs[index].present;
1384
1385         for (index = 0; index < MAX_HWIFS; ++index)
1386                 if (probe[index])
1387                         probe_hwif(&ide_hwifs[index]);
1388         for (index = 0; index < MAX_HWIFS; ++index)
1389                 if (probe[index])
1390                         hwif_init(&ide_hwifs[index]);
1391         for (index = 0; index < MAX_HWIFS; ++index) {
1392                 if (probe[index]) {
1393                         ide_hwif_t *hwif = &ide_hwifs[index];
1394                         if (!hwif->present)
1395                                 continue;
1396                         if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1397                                 hwif->chipset = ide_generic;
1398                         hwif_register_devices(hwif);
1399                 }
1400         }
1401         for (index = 0; index < MAX_HWIFS; ++index)
1402                 if (probe[index])
1403                         ide_proc_register_port(&ide_hwifs[index]);
1404         return 0;
1405 }
1406
1407 EXPORT_SYMBOL_GPL(ideprobe_init);
1408
1409 int ide_device_add(u8 idx[4])
1410 {
1411         int i, rc = 0;
1412
1413         for (i = 0; i < 4; i++) {
1414                 if (idx[i] != 0xff)
1415                         rc |= probe_hwif_init(&ide_hwifs[idx[i]]);
1416         }
1417
1418         for (i = 0; i < 4; i++) {
1419                 if (idx[i] != 0xff)
1420                         ide_proc_register_port(&ide_hwifs[idx[i]]);
1421         }
1422
1423         return rc;
1424 }
1425
1426 EXPORT_SYMBOL_GPL(ide_device_add);