Merge branch 'orion' into devel
[linux-2.6] / 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 : 0;
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 = 0;
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
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                 if (!hwif->irq) {
354                         autoprobe = 1;
355                         cookie = probe_irq_on();
356                 }
357                 ide_set_irq(drive, autoprobe);
358         }
359
360         retval = actual_try_to_identify(drive, cmd);
361
362         if (autoprobe) {
363                 int irq;
364
365                 ide_set_irq(drive, 0);
366                 /* clear drive IRQ */
367                 (void) hwif->INB(IDE_STATUS_REG);
368                 udelay(5);
369                 irq = probe_irq_off(cookie);
370                 if (!hwif->irq) {
371                         if (irq > 0) {
372                                 hwif->irq = irq;
373                         } else {
374                                 /* Mmmm.. multiple IRQs..
375                                  * don't know which was ours
376                                  */
377                                 printk("%s: IRQ probe failed (0x%lx)\n",
378                                         drive->name, cookie);
379                         }
380                 }
381         }
382         return retval;
383 }
384
385 static int ide_busy_sleep(ide_hwif_t *hwif)
386 {
387         unsigned long timeout = jiffies + WAIT_WORSTCASE;
388         u8 stat;
389
390         do {
391                 msleep(50);
392                 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
393                 if ((stat & BUSY_STAT) == 0)
394                         return 0;
395         } while (time_before(jiffies, timeout));
396
397         return 1;
398 }
399
400 /**
401  *      do_probe                -       probe an IDE device
402  *      @drive: drive to probe
403  *      @cmd: command to use
404  *
405  *      do_probe() has the difficult job of finding a drive if it exists,
406  *      without getting hung up if it doesn't exist, without trampling on
407  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
408  *
409  *      If a drive is "known" to exist (from CMOS or kernel parameters),
410  *      but does not respond right away, the probe will "hang in there"
411  *      for the maximum wait time (about 30 seconds), otherwise it will
412  *      exit much more quickly.
413  *
414  * Returns:     0  device was identified
415  *              1  device timed-out (no response to identify request)
416  *              2  device aborted the command (refused to identify itself)
417  *              3  bad status from device (possible for ATAPI drives)
418  *              4  probe was not attempted because failure was obvious
419  */
420
421 static int do_probe (ide_drive_t *drive, u8 cmd)
422 {
423         int rc;
424         ide_hwif_t *hwif = HWIF(drive);
425
426         if (drive->present) {
427                 /* avoid waiting for inappropriate probes */
428                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
429                         return 4;
430         }
431 #ifdef DEBUG
432         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
433                 drive->name, drive->present, drive->media,
434                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
435 #endif
436
437         /* needed for some systems
438          * (e.g. crw9624 as drive0 with disk as slave)
439          */
440         msleep(50);
441         SELECT_DRIVE(drive);
442         msleep(50);
443         if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
444                 if (drive->select.b.unit != 0) {
445                         /* exit with drive0 selected */
446                         SELECT_DRIVE(&hwif->drives[0]);
447                         /* allow BUSY_STAT to assert & clear */
448                         msleep(50);
449                 }
450                 /* no i/f present: mmm.. this should be a 4 -ml */
451                 return 3;
452         }
453
454         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
455             drive->present || cmd == WIN_PIDENTIFY) {
456                 /* send cmd and wait */
457                 if ((rc = try_to_identify(drive, cmd))) {
458                         /* failed: try again */
459                         rc = try_to_identify(drive,cmd);
460                 }
461                 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
462                         return 4;
463
464                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
465                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
466                         (drive->autotune == IDE_TUNE_AUTO))) {
467                         printk("%s: no response (status = 0x%02x), "
468                                 "resetting drive\n", drive->name,
469                                 hwif->INB(IDE_STATUS_REG));
470                         msleep(50);
471                         hwif->OUTB(drive->select.all, IDE_SELECT_REG);
472                         msleep(50);
473                         hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
474                         (void)ide_busy_sleep(hwif);
475                         rc = try_to_identify(drive, cmd);
476                 }
477                 if (rc == 1)
478                         printk("%s: no response (status = 0x%02x)\n",
479                                 drive->name, hwif->INB(IDE_STATUS_REG));
480                 /* ensure drive irq is clear */
481                 (void) hwif->INB(IDE_STATUS_REG);
482         } else {
483                 /* not present or maybe ATAPI */
484                 rc = 3;
485         }
486         if (drive->select.b.unit != 0) {
487                 /* exit with drive0 selected */
488                 SELECT_DRIVE(&hwif->drives[0]);
489                 msleep(50);
490                 /* ensure drive irq is clear */
491                 (void) hwif->INB(IDE_STATUS_REG);
492         }
493         return rc;
494 }
495
496 /*
497  *
498  */
499 static void enable_nest (ide_drive_t *drive)
500 {
501         ide_hwif_t *hwif = HWIF(drive);
502
503         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
504         SELECT_DRIVE(drive);
505         msleep(50);
506         hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
507
508         if (ide_busy_sleep(hwif)) {
509                 printk(KERN_CONT "failed (timeout)\n");
510                 return;
511         }
512
513         msleep(50);
514
515         if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
516                 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
517         } else {
518                 printk("success\n");
519         }
520
521         /* if !(success||timed-out) */
522         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
523                 /* look for ATAPI device */
524                 (void) do_probe(drive, WIN_PIDENTIFY);
525         }
526 }
527
528 /**
529  *      probe_for_drives        -       upper level drive probe
530  *      @drive: drive to probe for
531  *
532  *      probe_for_drive() tests for existence of a given drive using do_probe()
533  *      and presents things to the user as needed.
534  *
535  *      Returns:        0  no device was found
536  *                      1  device was found (note: drive->present might
537  *                         still be 0)
538  */
539  
540 static inline u8 probe_for_drive (ide_drive_t *drive)
541 {
542         /*
543          *      In order to keep things simple we have an id
544          *      block for all drives at all times. If the device
545          *      is pre ATA or refuses ATA/ATAPI identify we
546          *      will add faked data to this.
547          *
548          *      Also note that 0 everywhere means "can't do X"
549          */
550  
551         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
552         drive->id_read = 0;
553         if(drive->id == NULL)
554         {
555                 printk(KERN_ERR "ide: out of memory for id data.\n");
556                 return 0;
557         }
558         strcpy(drive->id->model, "UNKNOWN");
559         
560         /* skip probing? */
561         if (!drive->noprobe)
562         {
563                 /* if !(success||timed-out) */
564                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
565                         /* look for ATAPI device */
566                         (void) do_probe(drive, WIN_PIDENTIFY);
567                 }
568                 if (!drive->present)
569                         /* drive not found */
570                         return 0;
571                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
572                         enable_nest(drive);
573         
574                 /* identification failed? */
575                 if (!drive->id_read) {
576                         if (drive->media == ide_disk) {
577                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
578                                         drive->name, drive->cyl,
579                                         drive->head, drive->sect);
580                         } else if (drive->media == ide_cdrom) {
581                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
582                         } else {
583                                 /* nuke it */
584                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
585                                 drive->present = 0;
586                         }
587                 }
588                 /* drive was found */
589         }
590         if(!drive->present)
591                 return 0;
592         /* The drive wasn't being helpful. Add generic info only */
593         if (drive->id_read == 0) {
594                 generic_id(drive);
595                 return 1;
596         }
597
598         if (drive->media == ide_disk) {
599                 ide_disk_init_chs(drive);
600                 ide_disk_init_mult_count(drive);
601         }
602
603         return drive->present;
604 }
605
606 static void hwif_release_dev (struct device *dev)
607 {
608         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
609
610         complete(&hwif->gendev_rel_comp);
611 }
612
613 static void hwif_register (ide_hwif_t *hwif)
614 {
615         int ret;
616
617         /* register with global device tree */
618         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
619         hwif->gendev.driver_data = hwif;
620         if (hwif->gendev.parent == NULL) {
621                 if (hwif->pci_dev)
622                         hwif->gendev.parent = &hwif->pci_dev->dev;
623                 else
624                         /* Would like to do = &device_legacy */
625                         hwif->gendev.parent = NULL;
626         }
627         hwif->gendev.release = hwif_release_dev;
628         ret = device_register(&hwif->gendev);
629         if (ret < 0)
630                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
631                         __FUNCTION__, ret);
632 }
633
634 static int wait_hwif_ready(ide_hwif_t *hwif)
635 {
636         int unit, rc;
637
638         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
639
640         /* Let HW settle down a bit from whatever init state we
641          * come from */
642         mdelay(2);
643
644         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
645          * I know of at least one disk who takes 31 seconds, I use 35
646          * here to be safe
647          */
648         rc = ide_wait_not_busy(hwif, 35000);
649         if (rc)
650                 return rc;
651
652         /* Now make sure both master & slave are ready */
653         for (unit = 0; unit < MAX_DRIVES; unit++) {
654                 ide_drive_t *drive = &hwif->drives[unit];
655
656                 /* Ignore disks that we will not probe for later. */
657                 if (!drive->noprobe || drive->present) {
658                         SELECT_DRIVE(drive);
659                         ide_set_irq(drive, 1);
660                         mdelay(2);
661                         rc = ide_wait_not_busy(hwif, 35000);
662                         if (rc)
663                                 goto out;
664                 } else
665                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
666                                           drive->name);
667         }
668 out:
669         /* Exit function with master reselected (let's be sane) */
670         if (unit)
671                 SELECT_DRIVE(&hwif->drives[0]);
672
673         return rc;
674 }
675
676 /**
677  *      ide_undecoded_slave     -       look for bad CF adapters
678  *      @drive1: drive
679  *
680  *      Analyse the drives on the interface and attempt to decide if we
681  *      have the same drive viewed twice. This occurs with crap CF adapters
682  *      and PCMCIA sometimes.
683  */
684
685 void ide_undecoded_slave(ide_drive_t *drive1)
686 {
687         ide_drive_t *drive0 = &drive1->hwif->drives[0];
688
689         if ((drive1->dn & 1) == 0 || drive0->present == 0)
690                 return;
691
692         /* If the models don't match they are not the same product */
693         if (strcmp(drive0->id->model, drive1->id->model))
694                 return;
695
696         /* Serial numbers do not match */
697         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
698                 return;
699
700         /* No serial number, thankfully very rare for CF */
701         if (drive0->id->serial_no[0] == 0)
702                 return;
703
704         /* Appears to be an IDE flash adapter with decode bugs */
705         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
706
707         drive1->present = 0;
708 }
709
710 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
711
712 /*
713  * This routine only knows how to look for drive units 0 and 1
714  * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
715  */
716 static void probe_hwif(ide_hwif_t *hwif)
717 {
718         unsigned long flags;
719         unsigned int irqd;
720         int unit;
721
722         if (hwif->noprobe)
723                 return;
724
725         if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
726             (ide_hwif_request_regions(hwif))) {
727                 u16 msgout = 0;
728                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
729                         ide_drive_t *drive = &hwif->drives[unit];
730                         if (drive->present) {
731                                 drive->present = 0;
732                                 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
733                                         drive->name);
734                                 msgout = 1;
735                         }
736                 }
737                 if (!msgout)
738                         printk(KERN_ERR "%s: ports already in use, skipping probe\n",
739                                 hwif->name);
740                 return; 
741         }
742
743         /*
744          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
745          * we'll install our IRQ driver much later...
746          */
747         irqd = hwif->irq;
748         if (irqd)
749                 disable_irq(hwif->irq);
750
751         local_irq_set(flags);
752
753         /* This is needed on some PPCs and a bunch of BIOS-less embedded
754          * platforms. Typical cases are:
755          * 
756          *  - The firmware hard reset the disk before booting the kernel,
757          *    the drive is still doing it's poweron-reset sequence, that
758          *    can take up to 30 seconds
759          *  - The firmware does nothing (or no firmware), the device is
760          *    still in POST state (same as above actually).
761          *  - Some CD/DVD/Writer combo drives tend to drive the bus during
762          *    their reset sequence even when they are non-selected slave
763          *    devices, thus preventing discovery of the main HD
764          *    
765          *  Doing this wait-for-busy should not harm any existing configuration
766          *  (at least things won't be worse than what current code does, that
767          *  is blindly go & talk to the drive) and fix some issues like the
768          *  above.
769          *  
770          *  BenH.
771          */
772         if (wait_hwif_ready(hwif) == -EBUSY)
773                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
774
775         /*
776          * Need to probe slave device first to make it release PDIAG-.
777          */
778         for (unit = MAX_DRIVES - 1; unit >= 0; unit--) {
779                 ide_drive_t *drive = &hwif->drives[unit];
780                 drive->dn = (hwif->channel ? 2 : 0) + unit;
781                 (void) probe_for_drive(drive);
782                 if (drive->present && !hwif->present) {
783                         hwif->present = 1;
784                         if (hwif->chipset != ide_4drives ||
785                             !hwif->mate || 
786                             !hwif->mate->present) {
787                                 hwif_register(hwif);
788                         }
789                 }
790         }
791         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
792                 printk(KERN_WARNING "%s: reset\n", hwif->name);
793                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
794                 udelay(10);
795                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
796                 (void)ide_busy_sleep(hwif);
797         }
798         local_irq_restore(flags);
799         /*
800          * Use cached IRQ number. It might be (and is...) changed by probe
801          * code above
802          */
803         if (irqd)
804                 enable_irq(irqd);
805
806         if (!hwif->present) {
807                 ide_hwif_release_regions(hwif);
808                 return;
809         }
810
811         for (unit = 0; unit < MAX_DRIVES; unit++) {
812                 ide_drive_t *drive = &hwif->drives[unit];
813
814                 if (drive->present && hwif->quirkproc)
815                         hwif->quirkproc(drive);
816         }
817
818         for (unit = 0; unit < MAX_DRIVES; ++unit) {
819                 ide_drive_t *drive = &hwif->drives[unit];
820
821                 if (drive->present) {
822                         if (drive->autotune == IDE_TUNE_AUTO)
823                                 ide_set_max_pio(drive);
824
825                         if (drive->autotune != IDE_TUNE_DEFAULT &&
826                             drive->autotune != IDE_TUNE_AUTO)
827                                 continue;
828
829                         drive->nice1 = 1;
830
831                         if (hwif->dma_host_set)
832                                 ide_set_dma(drive);
833                 }
834         }
835
836         for (unit = 0; unit < MAX_DRIVES; ++unit) {
837                 ide_drive_t *drive = &hwif->drives[unit];
838
839                 if (hwif->no_io_32bit)
840                         drive->no_io_32bit = 1;
841                 else
842                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
843         }
844 }
845
846 #if MAX_HWIFS > 1
847 /*
848  * save_match() is used to simplify logic in init_irq() below.
849  *
850  * A loophole here is that we may not know about a particular
851  * hwif's irq until after that hwif is actually probed/initialized..
852  * This could be a problem for the case where an hwif is on a
853  * dual interface that requires serialization (eg. cmd640) and another
854  * hwif using one of the same irqs is initialized beforehand.
855  *
856  * This routine detects and reports such situations, but does not fix them.
857  */
858 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
859 {
860         ide_hwif_t *m = *match;
861
862         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
863                 if (!new->hwgroup)
864                         return;
865                 printk("%s: potential irq problem with %s and %s\n",
866                         hwif->name, new->name, m->name);
867         }
868         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
869                 *match = new;
870 }
871 #endif /* MAX_HWIFS > 1 */
872
873 /*
874  * init request queue
875  */
876 static int ide_init_queue(ide_drive_t *drive)
877 {
878         struct request_queue *q;
879         ide_hwif_t *hwif = HWIF(drive);
880         int max_sectors = 256;
881         int max_sg_entries = PRD_ENTRIES;
882
883         /*
884          *      Our default set up assumes the normal IDE case,
885          *      that is 64K segmenting, standard PRD setup
886          *      and LBA28. Some drivers then impose their own
887          *      limits and LBA48 we could raise it but as yet
888          *      do not.
889          */
890
891         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
892         if (!q)
893                 return 1;
894
895         q->queuedata = drive;
896         blk_queue_segment_boundary(q, 0xffff);
897
898         if (!hwif->rqsize) {
899                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
900                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
901                         hwif->rqsize = 256;
902                 else
903                         hwif->rqsize = 65536;
904         }
905         if (hwif->rqsize < max_sectors)
906                 max_sectors = hwif->rqsize;
907         blk_queue_max_sectors(q, max_sectors);
908
909 #ifdef CONFIG_PCI
910         /* When we have an IOMMU, we may have a problem where pci_map_sg()
911          * creates segments that don't completely match our boundary
912          * requirements and thus need to be broken up again. Because it
913          * doesn't align properly either, we may actually have to break up
914          * to more segments than what was we got in the first place, a max
915          * worst case is twice as many.
916          * This will be fixed once we teach pci_map_sg() about our boundary
917          * requirements, hopefully soon. *FIXME*
918          */
919         if (!PCI_DMA_BUS_IS_PHYS)
920                 max_sg_entries >>= 1;
921 #endif /* CONFIG_PCI */
922
923         blk_queue_max_hw_segments(q, max_sg_entries);
924         blk_queue_max_phys_segments(q, max_sg_entries);
925
926         /* assign drive queue */
927         drive->queue = q;
928
929         /* needs drive->queue to be set */
930         ide_toggle_bounce(drive, 1);
931
932         return 0;
933 }
934
935 /*
936  * This routine sets up the irq for an ide interface, and creates a new
937  * hwgroup for the irq/hwif if none was previously assigned.
938  *
939  * Much of the code is for correctly detecting/handling irq sharing
940  * and irq serialization situations.  This is somewhat complex because
941  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
942  */
943 static int init_irq (ide_hwif_t *hwif)
944 {
945         unsigned int index;
946         ide_hwgroup_t *hwgroup;
947         ide_hwif_t *match = NULL;
948
949
950         BUG_ON(in_interrupt());
951         BUG_ON(irqs_disabled());        
952         BUG_ON(hwif == NULL);
953
954         mutex_lock(&ide_cfg_mtx);
955         hwif->hwgroup = NULL;
956 #if MAX_HWIFS > 1
957         /*
958          * Group up with any other hwifs that share our irq(s).
959          */
960         for (index = 0; index < MAX_HWIFS; index++) {
961                 ide_hwif_t *h = &ide_hwifs[index];
962                 if (h->hwgroup) {  /* scan only initialized hwif's */
963                         if (hwif->irq == h->irq) {
964                                 hwif->sharing_irq = h->sharing_irq = 1;
965                                 if (hwif->chipset != ide_pci ||
966                                     h->chipset != ide_pci) {
967                                         save_match(hwif, h, &match);
968                                 }
969                         }
970                         if (hwif->serialized) {
971                                 if (hwif->mate && hwif->mate->irq == h->irq)
972                                         save_match(hwif, h, &match);
973                         }
974                         if (h->serialized) {
975                                 if (h->mate && hwif->irq == h->mate->irq)
976                                         save_match(hwif, h, &match);
977                         }
978                 }
979         }
980 #endif /* MAX_HWIFS > 1 */
981         /*
982          * If we are still without a hwgroup, then form a new one
983          */
984         if (match) {
985                 hwgroup = match->hwgroup;
986                 hwif->hwgroup = hwgroup;
987                 /*
988                  * Link us into the hwgroup.
989                  * This must be done early, do ensure that unexpected_intr
990                  * can find the hwif and prevent irq storms.
991                  * No drives are attached to the new hwif, choose_drive
992                  * can't do anything stupid (yet).
993                  * Add ourself as the 2nd entry to the hwgroup->hwif
994                  * linked list, the first entry is the hwif that owns
995                  * hwgroup->handler - do not change that.
996                  */
997                 spin_lock_irq(&ide_lock);
998                 hwif->next = hwgroup->hwif->next;
999                 hwgroup->hwif->next = hwif;
1000                 spin_unlock_irq(&ide_lock);
1001         } else {
1002                 hwgroup = kmalloc_node(sizeof(ide_hwgroup_t),
1003                                         GFP_KERNEL | __GFP_ZERO,
1004                                         hwif_to_node(hwif->drives[0].hwif));
1005                 if (!hwgroup)
1006                         goto out_up;
1007
1008                 hwif->hwgroup = hwgroup;
1009
1010                 hwgroup->hwif     = hwif->next = hwif;
1011                 hwgroup->rq       = NULL;
1012                 hwgroup->handler  = NULL;
1013                 hwgroup->drive    = NULL;
1014                 hwgroup->busy     = 0;
1015                 init_timer(&hwgroup->timer);
1016                 hwgroup->timer.function = &ide_timer_expiry;
1017                 hwgroup->timer.data = (unsigned long) hwgroup;
1018         }
1019
1020         /*
1021          * Allocate the irq, if not already obtained for another hwif
1022          */
1023         if (!match || match->irq != hwif->irq) {
1024                 int sa = 0;
1025 #if defined(__mc68000__) || defined(CONFIG_APUS)
1026                 sa = IRQF_SHARED;
1027 #endif /* __mc68000__ || CONFIG_APUS */
1028
1029                 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1030                         sa = IRQF_SHARED;
1031
1032                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1033                         /* clear nIEN */
1034                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1035
1036                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1037                         goto out_unlink;
1038         }
1039
1040         /*
1041          * For any present drive:
1042          * - allocate the block device queue
1043          * - link drive into the hwgroup
1044          */
1045         for (index = 0; index < MAX_DRIVES; ++index) {
1046                 ide_drive_t *drive = &hwif->drives[index];
1047                 if (!drive->present)
1048                         continue;
1049                 if (ide_init_queue(drive)) {
1050                         printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1051                         continue;
1052                 }
1053                 spin_lock_irq(&ide_lock);
1054                 if (!hwgroup->drive) {
1055                         /* first drive for hwgroup. */
1056                         drive->next = drive;
1057                         hwgroup->drive = drive;
1058                         hwgroup->hwif = HWIF(hwgroup->drive);
1059                 } else {
1060                         drive->next = hwgroup->drive->next;
1061                         hwgroup->drive->next = drive;
1062                 }
1063                 spin_unlock_irq(&ide_lock);
1064         }
1065
1066 #if !defined(__mc68000__) && !defined(CONFIG_APUS)
1067         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1068                 hwif->io_ports[IDE_DATA_OFFSET],
1069                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1070                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1071 #else
1072         printk("%s at 0x%08lx on irq %d", hwif->name,
1073                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1074 #endif /* __mc68000__ && CONFIG_APUS */
1075         if (match)
1076                 printk(" (%sed with %s)",
1077                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1078         printk("\n");
1079         mutex_unlock(&ide_cfg_mtx);
1080         return 0;
1081 out_unlink:
1082         spin_lock_irq(&ide_lock);
1083         if (hwif->next == hwif) {
1084                 BUG_ON(match);
1085                 BUG_ON(hwgroup->hwif != hwif);
1086                 kfree(hwgroup);
1087         } else {
1088                 ide_hwif_t *g;
1089                 g = hwgroup->hwif;
1090                 while (g->next != hwif)
1091                         g = g->next;
1092                 g->next = hwif->next;
1093                 if (hwgroup->hwif == hwif) {
1094                         /* Impossible. */
1095                         printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1096                         hwgroup->hwif = g;
1097                 }
1098                 BUG_ON(hwgroup->hwif == hwif);
1099         }
1100         spin_unlock_irq(&ide_lock);
1101 out_up:
1102         mutex_unlock(&ide_cfg_mtx);
1103         return 1;
1104 }
1105
1106 static int ata_lock(dev_t dev, void *data)
1107 {
1108         /* FIXME: we want to pin hwif down */
1109         return 0;
1110 }
1111
1112 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1113 {
1114         ide_hwif_t *hwif = data;
1115         int unit = *part >> PARTN_BITS;
1116         ide_drive_t *drive = &hwif->drives[unit];
1117         if (!drive->present)
1118                 return NULL;
1119
1120         if (drive->media == ide_disk)
1121                 request_module("ide-disk");
1122         if (drive->scsi)
1123                 request_module("ide-scsi");
1124         if (drive->media == ide_cdrom || drive->media == ide_optical)
1125                 request_module("ide-cd");
1126         if (drive->media == ide_tape)
1127                 request_module("ide-tape");
1128         if (drive->media == ide_floppy)
1129                 request_module("ide-floppy");
1130
1131         return NULL;
1132 }
1133
1134 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1135 {
1136         struct gendisk *p = data;
1137         *part &= (1 << PARTN_BITS) - 1;
1138         return &p->dev.kobj;
1139 }
1140
1141 static int exact_lock(dev_t dev, void *data)
1142 {
1143         struct gendisk *p = data;
1144
1145         if (!get_disk(p))
1146                 return -1;
1147         return 0;
1148 }
1149
1150 void ide_register_region(struct gendisk *disk)
1151 {
1152         blk_register_region(MKDEV(disk->major, disk->first_minor),
1153                             disk->minors, NULL, exact_match, exact_lock, disk);
1154 }
1155
1156 EXPORT_SYMBOL_GPL(ide_register_region);
1157
1158 void ide_unregister_region(struct gendisk *disk)
1159 {
1160         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1161                               disk->minors);
1162 }
1163
1164 EXPORT_SYMBOL_GPL(ide_unregister_region);
1165
1166 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1167 {
1168         ide_hwif_t *hwif = drive->hwif;
1169         unsigned int unit = (drive->select.all >> 4) & 1;
1170
1171         disk->major = hwif->major;
1172         disk->first_minor = unit << PARTN_BITS;
1173         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1174         disk->queue = drive->queue;
1175 }
1176
1177 EXPORT_SYMBOL_GPL(ide_init_disk);
1178
1179 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1180 {
1181         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1182
1183         if (drive == drive->next) {
1184                 /* special case: last drive from hwgroup. */
1185                 BUG_ON(hwgroup->drive != drive);
1186                 hwgroup->drive = NULL;
1187         } else {
1188                 ide_drive_t *walk;
1189
1190                 walk = hwgroup->drive;
1191                 while (walk->next != drive)
1192                         walk = walk->next;
1193                 walk->next = drive->next;
1194                 if (hwgroup->drive == drive) {
1195                         hwgroup->drive = drive->next;
1196                         hwgroup->hwif = hwgroup->drive->hwif;
1197                 }
1198         }
1199         BUG_ON(hwgroup->drive == drive);
1200 }
1201
1202 static void drive_release_dev (struct device *dev)
1203 {
1204         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1205
1206         spin_lock_irq(&ide_lock);
1207         ide_remove_drive_from_hwgroup(drive);
1208         kfree(drive->id);
1209         drive->id = NULL;
1210         drive->present = 0;
1211         /* Messed up locking ... */
1212         spin_unlock_irq(&ide_lock);
1213         blk_cleanup_queue(drive->queue);
1214         spin_lock_irq(&ide_lock);
1215         drive->queue = NULL;
1216         spin_unlock_irq(&ide_lock);
1217
1218         complete(&drive->gendev_rel_comp);
1219 }
1220
1221 /*
1222  * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1223  * after probing for drives, to allocate partition tables and other data
1224  * structures needed for the routines in genhd.c.  ide_geninit() gets called
1225  * somewhat later, during the partition check.
1226  */
1227 static void init_gendisk (ide_hwif_t *hwif)
1228 {
1229         unsigned int unit;
1230
1231         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1232                 ide_drive_t * drive = &hwif->drives[unit];
1233                 ide_add_generic_settings(drive);
1234                 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1235                          hwif->index,unit);
1236                 drive->gendev.parent = &hwif->gendev;
1237                 drive->gendev.bus = &ide_bus_type;
1238                 drive->gendev.driver_data = drive;
1239                 drive->gendev.release = drive_release_dev;
1240         }
1241         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1242                         THIS_MODULE, ata_probe, ata_lock, hwif);
1243 }
1244
1245 static int hwif_init(ide_hwif_t *hwif)
1246 {
1247         int old_irq;
1248
1249         /* Return success if no device is connected */
1250         if (!hwif->present)
1251                 return 1;
1252
1253         if (!hwif->irq) {
1254                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1255                 {
1256                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1257                         return (hwif->present = 0);
1258                 }
1259         }
1260 #ifdef CONFIG_BLK_DEV_HD
1261         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1262                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1263                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1264                 return (hwif->present = 0);
1265         }
1266 #endif /* CONFIG_BLK_DEV_HD */
1267
1268         /* we set it back to 1 if all is ok below */    
1269         hwif->present = 0;
1270
1271         if (register_blkdev(hwif->major, hwif->name))
1272                 return 0;
1273
1274         if (!hwif->sg_max_nents)
1275                 hwif->sg_max_nents = PRD_ENTRIES;
1276
1277         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1278                                  GFP_KERNEL);
1279         if (!hwif->sg_table) {
1280                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1281                 goto out;
1282         }
1283
1284         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1285         
1286         if (init_irq(hwif) == 0)
1287                 goto done;
1288
1289         old_irq = hwif->irq;
1290         /*
1291          *      It failed to initialise. Find the default IRQ for 
1292          *      this port and try that.
1293          */
1294         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1295                 printk("%s: Disabled unable to get IRQ %d.\n",
1296                         hwif->name, old_irq);
1297                 goto out;
1298         }
1299         if (init_irq(hwif)) {
1300                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1301                         hwif->name, old_irq, hwif->irq);
1302                 goto out;
1303         }
1304         printk("%s: probed IRQ %d failed, using default.\n",
1305                 hwif->name, hwif->irq);
1306
1307 done:
1308         init_gendisk(hwif);
1309
1310         ide_acpi_init(hwif);
1311
1312         hwif->present = 1;      /* success */
1313         return 1;
1314
1315 out:
1316         unregister_blkdev(hwif->major, hwif->name);
1317         return 0;
1318 }
1319
1320 static void hwif_register_devices(ide_hwif_t *hwif)
1321 {
1322         unsigned int i;
1323
1324         for (i = 0; i < MAX_DRIVES; i++) {
1325                 ide_drive_t *drive = &hwif->drives[i];
1326
1327                 if (drive->present) {
1328                         int ret = device_register(&drive->gendev);
1329
1330                         if (ret < 0)
1331                                 printk(KERN_WARNING "IDE: %s: "
1332                                         "device_register error: %d\n",
1333                                         __FUNCTION__, ret);
1334                 }
1335         }
1336 }
1337
1338 int ide_device_add_all(u8 *idx)
1339 {
1340         ide_hwif_t *hwif;
1341         int i, rc = 0;
1342
1343         for (i = 0; i < MAX_HWIFS; i++) {
1344                 if (idx[i] == 0xff)
1345                         continue;
1346
1347                 probe_hwif(&ide_hwifs[idx[i]]);
1348         }
1349
1350         for (i = 0; i < MAX_HWIFS; i++) {
1351                 if (idx[i] == 0xff)
1352                         continue;
1353
1354                 hwif = &ide_hwifs[idx[i]];
1355
1356                 if (hwif_init(hwif) == 0) {
1357                         printk(KERN_INFO "%s: failed to initialize IDE "
1358                                          "interface\n", hwif->name);
1359                         rc = -1;
1360                         continue;
1361                 }
1362         }
1363
1364         for (i = 0; i < MAX_HWIFS; i++) {
1365                 if (idx[i] == 0xff)
1366                         continue;
1367
1368                 hwif = &ide_hwifs[idx[i]];
1369
1370                 if (hwif->present) {
1371                         if (hwif->chipset == ide_unknown ||
1372                             hwif->chipset == ide_forced)
1373                                 hwif->chipset = ide_generic;
1374                         hwif_register_devices(hwif);
1375                 }
1376         }
1377
1378         for (i = 0; i < MAX_HWIFS; i++) {
1379                 if (idx[i] != 0xff)
1380                         ide_proc_register_port(&ide_hwifs[idx[i]]);
1381         }
1382
1383         return rc;
1384 }
1385 EXPORT_SYMBOL_GPL(ide_device_add_all);
1386
1387 int ide_device_add(u8 idx[4])
1388 {
1389         u8 idx_all[MAX_HWIFS];
1390         int i;
1391
1392         for (i = 0; i < MAX_HWIFS; i++)
1393                 idx_all[i] = (i < 4) ? idx[i] : 0xff;
1394
1395         return ide_device_add_all(idx_all);
1396 }
1397 EXPORT_SYMBOL_GPL(ide_device_add);