Merge git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6
[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  * Version 1.00         move drive probing code from ide.c to ide-probe.c
17  * Version 1.01         fix compilation problem for m68k
18  * Version 1.02         increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
19  *                       by Andrea Arcangeli
20  * Version 1.03         fix for (hwif->chipset == ide_4drives)
21  * Version 1.04         fixed buggy treatments of known flash memory cards
22  *
23  * Version 1.05         fix for (hwif->chipset == ide_pdc4030)
24  *                      added ide6/7/8/9
25  *                      allowed for secondary flash card to be detectable
26  *                       with new flag : drive->ata_flash : 1;
27  * Version 1.06         stream line request queue and prep for cascade project.
28  * Version 1.07         max_sect <= 255; slower disks would get behind and
29  *                      then fall over when they get to 256.    Paul G.
30  * Version 1.10         Update set for new IDE. drive->id is now always
31  *                      valid after probe time even with noprobe
32  */
33
34 #include <linux/module.h>
35 #include <linux/types.h>
36 #include <linux/string.h>
37 #include <linux/kernel.h>
38 #include <linux/timer.h>
39 #include <linux/mm.h>
40 #include <linux/interrupt.h>
41 #include <linux/major.h>
42 #include <linux/errno.h>
43 #include <linux/genhd.h>
44 #include <linux/slab.h>
45 #include <linux/delay.h>
46 #include <linux/ide.h>
47 #include <linux/spinlock.h>
48 #include <linux/kmod.h>
49 #include <linux/pci.h>
50
51 #include <asm/byteorder.h>
52 #include <asm/irq.h>
53 #include <asm/uaccess.h>
54 #include <asm/io.h>
55
56 /**
57  *      generic_id              -       add a generic drive id
58  *      @drive: drive to make an ID block for
59  *      
60  *      Add a fake id field to the drive we are passed. This allows
61  *      use to skip a ton of NULL checks (which people always miss) 
62  *      and make drive properties unconditional outside of this file
63  */
64  
65 static void generic_id(ide_drive_t *drive)
66 {
67         drive->id->cyls = drive->cyl;
68         drive->id->heads = drive->head;
69         drive->id->sectors = drive->sect;
70         drive->id->cur_cyls = drive->cyl;
71         drive->id->cur_heads = drive->head;
72         drive->id->cur_sectors = drive->sect;
73 }
74
75 static void ide_disk_init_chs(ide_drive_t *drive)
76 {
77         struct hd_driveid *id = drive->id;
78
79         /* Extract geometry if we did not already have one for the drive */
80         if (!drive->cyl || !drive->head || !drive->sect) {
81                 drive->cyl  = drive->bios_cyl  = id->cyls;
82                 drive->head = drive->bios_head = id->heads;
83                 drive->sect = drive->bios_sect = id->sectors;
84         }
85
86         /* Handle logical geometry translation by the drive */
87         if ((id->field_valid & 1) && id->cur_cyls &&
88             id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
89                 drive->cyl  = id->cur_cyls;
90                 drive->head = id->cur_heads;
91                 drive->sect = id->cur_sectors;
92         }
93
94         /* Use physical geometry if what we have still makes no sense */
95         if (drive->head > 16 && id->heads && id->heads <= 16) {
96                 drive->cyl  = id->cyls;
97                 drive->head = id->heads;
98                 drive->sect = id->sectors;
99         }
100 }
101
102 static void ide_disk_init_mult_count(ide_drive_t *drive)
103 {
104         struct hd_driveid *id = drive->id;
105
106         drive->mult_count = 0;
107         if (id->max_multsect) {
108 #ifdef CONFIG_IDEDISK_MULTI_MODE
109                 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
110                 id->multsect_valid = id->multsect ? 1 : 0;
111                 drive->mult_req = id->multsect_valid ? id->max_multsect : INITIAL_MULT_COUNT;
112                 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
113 #else   /* original, pre IDE-NFG, per request of AC */
114                 drive->mult_req = INITIAL_MULT_COUNT;
115                 if (drive->mult_req > id->max_multsect)
116                         drive->mult_req = id->max_multsect;
117                 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
118                         drive->special.b.set_multmode = 1;
119 #endif
120         }
121 }
122
123 /**
124  *      do_identify     -       identify a drive
125  *      @drive: drive to identify 
126  *      @cmd: command used
127  *
128  *      Called when we have issued a drive identify command to
129  *      read and parse the results. This function is run with
130  *      interrupts disabled. 
131  */
132  
133 static inline void do_identify (ide_drive_t *drive, u8 cmd)
134 {
135         ide_hwif_t *hwif = HWIF(drive);
136         int bswap = 1;
137         struct hd_driveid *id;
138
139         id = drive->id;
140         /* read 512 bytes of id info */
141         hwif->ata_input_data(drive, id, SECTOR_WORDS);
142
143         drive->id_read = 1;
144         local_irq_enable();
145         ide_fix_driveid(id);
146
147 #if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
148         /*
149          * EATA SCSI controllers do a hardware ATA emulation:
150          * Ignore them if there is a driver for them available.
151          */
152         if ((id->model[0] == 'P' && id->model[1] == 'M') ||
153             (id->model[0] == 'S' && id->model[1] == 'K')) {
154                 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
155                 goto err_misc;
156         }
157 #endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
158
159         /*
160          *  WIN_IDENTIFY returns little-endian info,
161          *  WIN_PIDENTIFY *usually* returns little-endian info.
162          */
163         if (cmd == WIN_PIDENTIFY) {
164                 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
165                  || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
166                  || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
167                         /* Vertos drives may still be weird */
168                         bswap ^= 1;     
169         }
170         ide_fixstring(id->model,     sizeof(id->model),     bswap);
171         ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
172         ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
173
174         if (strstr(id->model, "E X A B Y T E N E S T"))
175                 goto err_misc;
176
177         /* we depend on this a lot! */
178         id->model[sizeof(id->model)-1] = '\0';
179         printk("%s: %s, ", drive->name, id->model);
180         drive->present = 1;
181         drive->dead = 0;
182
183         /*
184          * Check for an ATAPI device
185          */
186         if (cmd == WIN_PIDENTIFY) {
187                 u8 type = (id->config >> 8) & 0x1f;
188                 printk("ATAPI ");
189                 switch (type) {
190                         case ide_floppy:
191                                 if (!strstr(id->model, "CD-ROM")) {
192                                         if (!strstr(id->model, "oppy") &&
193                                             !strstr(id->model, "poyp") &&
194                                             !strstr(id->model, "ZIP"))
195                                                 printk("cdrom or floppy?, assuming ");
196                                         if (drive->media != ide_cdrom) {
197                                                 printk ("FLOPPY");
198                                                 drive->removable = 1;
199                                                 break;
200                                         }
201                                 }
202                                 /* Early cdrom models used zero */
203                                 type = ide_cdrom;
204                         case ide_cdrom:
205                                 drive->removable = 1;
206 #ifdef CONFIG_PPC
207                                 /* kludge for Apple PowerBook internal zip */
208                                 if (!strstr(id->model, "CD-ROM") &&
209                                     strstr(id->model, "ZIP")) {
210                                         printk ("FLOPPY");
211                                         type = ide_floppy;
212                                         break;
213                                 }
214 #endif
215                                 printk ("CD/DVD-ROM");
216                                 break;
217                         case ide_tape:
218                                 printk ("TAPE");
219                                 break;
220                         case ide_optical:
221                                 printk ("OPTICAL");
222                                 drive->removable = 1;
223                                 break;
224                         default:
225                                 printk("UNKNOWN (type %d)", type);
226                                 break;
227                 }
228                 printk (" drive\n");
229                 drive->media = type;
230                 /* an ATAPI device ignores DRDY */
231                 drive->ready_stat = 0;
232                 return;
233         }
234
235         /*
236          * Not an ATAPI device: looks like a "regular" hard disk
237          */
238
239         /*
240          * 0x848a = CompactFlash device
241          * These are *not* removable in Linux definition of the term
242          */
243
244         if ((id->config != 0x848a) && (id->config & (1<<7)))
245                 drive->removable = 1;
246
247         drive->media = ide_disk;
248         printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
249         QUIRK_LIST(drive);
250         return;
251
252 err_misc:
253         kfree(id);
254         drive->present = 0;
255         return;
256 }
257
258 /**
259  *      actual_try_to_identify  -       send ata/atapi identify
260  *      @drive: drive to identify
261  *      @cmd: command to use
262  *
263  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
264  *      and waits for a response.  It also monitors irqs while this is
265  *      happening, in hope of automatically determining which one is
266  *      being used by the interface.
267  *
268  *      Returns:        0  device was identified
269  *                      1  device timed-out (no response to identify request)
270  *                      2  device aborted the command (refused to identify itself)
271  */
272
273 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
274 {
275         ide_hwif_t *hwif = HWIF(drive);
276         int rc;
277         unsigned long hd_status;
278         unsigned long timeout;
279         u8 s = 0, a = 0;
280
281         /* take a deep breath */
282         msleep(50);
283
284         if (IDE_CONTROL_REG) {
285                 a = hwif->INB(IDE_ALTSTATUS_REG);
286                 s = hwif->INB(IDE_STATUS_REG);
287                 if ((a ^ s) & ~INDEX_STAT) {
288                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
289                                 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
290                         /* ancient Seagate drives, broken interfaces */
291                         hd_status = IDE_STATUS_REG;
292                 } else {
293                         /* use non-intrusive polling */
294                         hd_status = IDE_ALTSTATUS_REG;
295                 }
296         } else
297                 hd_status = IDE_STATUS_REG;
298
299         /* set features register for atapi
300          * identify command to be sure of reply
301          */
302         if ((cmd == WIN_PIDENTIFY))
303                 /* disable dma & overlap */
304                 hwif->OUTB(0, IDE_FEATURE_REG);
305
306         /* ask drive for ID */
307         hwif->OUTB(cmd, IDE_COMMAND_REG);
308
309         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
310         timeout += jiffies;
311         do {
312                 if (time_after(jiffies, timeout)) {
313                         /* drive timed-out */
314                         return 1;
315                 }
316                 /* give drive a breather */
317                 msleep(50);
318         } while ((hwif->INB(hd_status)) & BUSY_STAT);
319
320         /* wait for IRQ and DRQ_STAT */
321         msleep(50);
322         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
323                 unsigned long flags;
324
325                 /* local CPU only; some systems need this */
326                 local_irq_save(flags);
327                 /* drive returned ID */
328                 do_identify(drive, cmd);
329                 /* drive responded with ID */
330                 rc = 0;
331                 /* clear drive IRQ */
332                 (void) hwif->INB(IDE_STATUS_REG);
333                 local_irq_restore(flags);
334         } else {
335                 /* drive refused ID */
336                 rc = 2;
337         }
338         return rc;
339 }
340
341 /**
342  *      try_to_identify -       try to identify a drive
343  *      @drive: drive to probe
344  *      @cmd: command to use
345  *
346  *      Issue the identify command and then do IRQ probing to
347  *      complete the identification when needed by finding the
348  *      IRQ the drive is attached to
349  */
350  
351 static int try_to_identify (ide_drive_t *drive, u8 cmd)
352 {
353         ide_hwif_t *hwif = HWIF(drive);
354         int retval;
355         int autoprobe = 0;
356         unsigned long cookie = 0;
357
358         /*
359          * Disable device irq unless we need to
360          * probe for it. Otherwise we'll get spurious
361          * interrupts during the identify-phase that
362          * the irq handler isn't expecting.
363          */
364         if (IDE_CONTROL_REG) {
365                 u8 ctl = drive->ctl | 2;
366                 if (!hwif->irq) {
367                         autoprobe = 1;
368                         cookie = probe_irq_on();
369                         /* enable device irq */
370                         ctl &= ~2;
371                 }
372                 hwif->OUTB(ctl, IDE_CONTROL_REG);
373         }
374
375         retval = actual_try_to_identify(drive, cmd);
376
377         if (autoprobe) {
378                 int irq;
379                 /* mask device irq */
380                 hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
381                 /* clear drive IRQ */
382                 (void) hwif->INB(IDE_STATUS_REG);
383                 udelay(5);
384                 irq = probe_irq_off(cookie);
385                 if (!hwif->irq) {
386                         if (irq > 0) {
387                                 hwif->irq = irq;
388                         } else {
389                                 /* Mmmm.. multiple IRQs..
390                                  * don't know which was ours
391                                  */
392                                 printk("%s: IRQ probe failed (0x%lx)\n",
393                                         drive->name, cookie);
394                         }
395                 }
396         }
397         return retval;
398 }
399
400
401 /**
402  *      do_probe                -       probe an IDE device
403  *      @drive: drive to probe
404  *      @cmd: command to use
405  *
406  *      do_probe() has the difficult job of finding a drive if it exists,
407  *      without getting hung up if it doesn't exist, without trampling on
408  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
409  *
410  *      If a drive is "known" to exist (from CMOS or kernel parameters),
411  *      but does not respond right away, the probe will "hang in there"
412  *      for the maximum wait time (about 30 seconds), otherwise it will
413  *      exit much more quickly.
414  *
415  * Returns:     0  device was identified
416  *              1  device timed-out (no response to identify request)
417  *              2  device aborted the command (refused to identify itself)
418  *              3  bad status from device (possible for ATAPI drives)
419  *              4  probe was not attempted because failure was obvious
420  */
421
422 static int do_probe (ide_drive_t *drive, u8 cmd)
423 {
424         int rc;
425         ide_hwif_t *hwif = HWIF(drive);
426
427         if (drive->present) {
428                 /* avoid waiting for inappropriate probes */
429                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
430                         return 4;
431         }
432 #ifdef DEBUG
433         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
434                 drive->name, drive->present, drive->media,
435                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
436 #endif
437
438         /* needed for some systems
439          * (e.g. crw9624 as drive0 with disk as slave)
440          */
441         msleep(50);
442         SELECT_DRIVE(drive);
443         msleep(50);
444         if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
445                 if (drive->select.b.unit != 0) {
446                         /* exit with drive0 selected */
447                         SELECT_DRIVE(&hwif->drives[0]);
448                         /* allow BUSY_STAT to assert & clear */
449                         msleep(50);
450                 }
451                 /* no i/f present: mmm.. this should be a 4 -ml */
452                 return 3;
453         }
454
455         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
456             drive->present || cmd == WIN_PIDENTIFY) {
457                 /* send cmd and wait */
458                 if ((rc = try_to_identify(drive, cmd))) {
459                         /* failed: try again */
460                         rc = try_to_identify(drive,cmd);
461                 }
462                 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
463                         return 4;
464
465                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
466                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
467                         (drive->autotune == IDE_TUNE_AUTO))) {
468                         unsigned long timeout;
469                         printk("%s: no response (status = 0x%02x), "
470                                 "resetting drive\n", drive->name,
471                                 hwif->INB(IDE_STATUS_REG));
472                         msleep(50);
473                         hwif->OUTB(drive->select.all, IDE_SELECT_REG);
474                         msleep(50);
475                         hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
476                         timeout = jiffies;
477                         while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
478                                time_before(jiffies, timeout + WAIT_WORSTCASE))
479                                 msleep(50);
480                         rc = try_to_identify(drive, cmd);
481                 }
482                 if (rc == 1)
483                         printk("%s: no response (status = 0x%02x)\n",
484                                 drive->name, hwif->INB(IDE_STATUS_REG));
485                 /* ensure drive irq is clear */
486                 (void) hwif->INB(IDE_STATUS_REG);
487         } else {
488                 /* not present or maybe ATAPI */
489                 rc = 3;
490         }
491         if (drive->select.b.unit != 0) {
492                 /* exit with drive0 selected */
493                 SELECT_DRIVE(&hwif->drives[0]);
494                 msleep(50);
495                 /* ensure drive irq is clear */
496                 (void) hwif->INB(IDE_STATUS_REG);
497         }
498         return rc;
499 }
500
501 /*
502  *
503  */
504 static void enable_nest (ide_drive_t *drive)
505 {
506         ide_hwif_t *hwif = HWIF(drive);
507         unsigned long timeout;
508
509         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
510         SELECT_DRIVE(drive);
511         msleep(50);
512         hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
513         timeout = jiffies + WAIT_WORSTCASE;
514         do {
515                 if (time_after(jiffies, timeout)) {
516                         printk("failed (timeout)\n");
517                         return;
518                 }
519                 msleep(50);
520         } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
521
522         msleep(50);
523
524         if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
525                 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
526         } else {
527                 printk("success\n");
528         }
529
530         /* if !(success||timed-out) */
531         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
532                 /* look for ATAPI device */
533                 (void) do_probe(drive, WIN_PIDENTIFY);
534         }
535 }
536
537 /**
538  *      probe_for_drives        -       upper level drive probe
539  *      @drive: drive to probe for
540  *
541  *      probe_for_drive() tests for existence of a given drive using do_probe()
542  *      and presents things to the user as needed.
543  *
544  *      Returns:        0  no device was found
545  *                      1  device was found (note: drive->present might
546  *                         still be 0)
547  */
548  
549 static inline u8 probe_for_drive (ide_drive_t *drive)
550 {
551         /*
552          *      In order to keep things simple we have an id
553          *      block for all drives at all times. If the device
554          *      is pre ATA or refuses ATA/ATAPI identify we
555          *      will add faked data to this.
556          *
557          *      Also note that 0 everywhere means "can't do X"
558          */
559  
560         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
561         drive->id_read = 0;
562         if(drive->id == NULL)
563         {
564                 printk(KERN_ERR "ide: out of memory for id data.\n");
565                 return 0;
566         }
567         strcpy(drive->id->model, "UNKNOWN");
568         
569         /* skip probing? */
570         if (!drive->noprobe)
571         {
572                 /* if !(success||timed-out) */
573                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
574                         /* look for ATAPI device */
575                         (void) do_probe(drive, WIN_PIDENTIFY);
576                 }
577                 if (!drive->present)
578                         /* drive not found */
579                         return 0;
580                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
581                         enable_nest(drive);
582         
583                 /* identification failed? */
584                 if (!drive->id_read) {
585                         if (drive->media == ide_disk) {
586                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
587                                         drive->name, drive->cyl,
588                                         drive->head, drive->sect);
589                         } else if (drive->media == ide_cdrom) {
590                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
591                         } else {
592                                 /* nuke it */
593                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
594                                 drive->present = 0;
595                         }
596                 }
597                 /* drive was found */
598         }
599         if(!drive->present)
600                 return 0;
601         /* The drive wasn't being helpful. Add generic info only */
602         if (drive->id_read == 0) {
603                 generic_id(drive);
604                 return 1;
605         }
606
607         if (drive->media == ide_disk) {
608                 ide_disk_init_chs(drive);
609                 ide_disk_init_mult_count(drive);
610         }
611
612         return drive->present;
613 }
614
615 static void hwif_release_dev (struct device *dev)
616 {
617         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
618
619         complete(&hwif->gendev_rel_comp);
620 }
621
622 static void hwif_register (ide_hwif_t *hwif)
623 {
624         int ret;
625
626         /* register with global device tree */
627         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
628         hwif->gendev.driver_data = hwif;
629         if (hwif->gendev.parent == NULL) {
630                 if (hwif->pci_dev)
631                         hwif->gendev.parent = &hwif->pci_dev->dev;
632                 else
633                         /* Would like to do = &device_legacy */
634                         hwif->gendev.parent = NULL;
635         }
636         hwif->gendev.release = hwif_release_dev;
637         ret = device_register(&hwif->gendev);
638         if (ret < 0)
639                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
640                         __FUNCTION__, ret);
641 }
642
643 static int wait_hwif_ready(ide_hwif_t *hwif)
644 {
645         int rc;
646
647         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
648
649         /* Let HW settle down a bit from whatever init state we
650          * come from */
651         mdelay(2);
652
653         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
654          * I know of at least one disk who takes 31 seconds, I use 35
655          * here to be safe
656          */
657         rc = ide_wait_not_busy(hwif, 35000);
658         if (rc)
659                 return rc;
660
661         /* Now make sure both master & slave are ready */
662         SELECT_DRIVE(&hwif->drives[0]);
663         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
664         mdelay(2);
665         rc = ide_wait_not_busy(hwif, 35000);
666         if (rc)
667                 return rc;
668         SELECT_DRIVE(&hwif->drives[1]);
669         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
670         mdelay(2);
671         rc = ide_wait_not_busy(hwif, 35000);
672
673         /* Exit function with master reselected (let's be sane) */
674         SELECT_DRIVE(&hwif->drives[0]);
675         
676         return rc;
677 }
678
679 /**
680  *      ide_undecoded_slave     -       look for bad CF adapters
681  *      @hwif: interface
682  *
683  *      Analyse the drives on the interface and attempt to decide if we
684  *      have the same drive viewed twice. This occurs with crap CF adapters
685  *      and PCMCIA sometimes.
686  */
687
688 void ide_undecoded_slave(ide_hwif_t *hwif)
689 {
690         ide_drive_t *drive0 = &hwif->drives[0];
691         ide_drive_t *drive1 = &hwif->drives[1];
692
693         if (drive0->present == 0 || drive1->present == 0)
694                 return;
695
696         /* If the models don't match they are not the same product */
697         if (strcmp(drive0->id->model, drive1->id->model))
698                 return;
699
700         /* Serial numbers do not match */
701         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
702                 return;
703
704         /* No serial number, thankfully very rare for CF */
705         if (drive0->id->serial_no[0] == 0)
706                 return;
707
708         /* Appears to be an IDE flash adapter with decode bugs */
709         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
710
711         drive1->present = 0;
712 }
713
714 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
715
716 /*
717  * This routine only knows how to look for drive units 0 and 1
718  * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
719  */
720 static void probe_hwif(ide_hwif_t *hwif, void (*fixup)(ide_hwif_t *hwif))
721 {
722         unsigned long flags;
723         unsigned int irqd;
724         int unit;
725
726         if (hwif->noprobe)
727                 return;
728
729         if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
730             (ide_hwif_request_regions(hwif))) {
731                 u16 msgout = 0;
732                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
733                         ide_drive_t *drive = &hwif->drives[unit];
734                         if (drive->present) {
735                                 drive->present = 0;
736                                 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
737                                         drive->name);
738                                 msgout = 1;
739                         }
740                 }
741                 if (!msgout)
742                         printk(KERN_ERR "%s: ports already in use, skipping probe\n",
743                                 hwif->name);
744                 return; 
745         }
746
747         /*
748          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
749          * we'll install our IRQ driver much later...
750          */
751         irqd = hwif->irq;
752         if (irqd)
753                 disable_irq(hwif->irq);
754
755         local_irq_set(flags);
756
757         /* This is needed on some PPCs and a bunch of BIOS-less embedded
758          * platforms. Typical cases are:
759          * 
760          *  - The firmware hard reset the disk before booting the kernel,
761          *    the drive is still doing it's poweron-reset sequence, that
762          *    can take up to 30 seconds
763          *  - The firmware does nothing (or no firmware), the device is
764          *    still in POST state (same as above actually).
765          *  - Some CD/DVD/Writer combo drives tend to drive the bus during
766          *    their reset sequence even when they are non-selected slave
767          *    devices, thus preventing discovery of the main HD
768          *    
769          *  Doing this wait-for-busy should not harm any existing configuration
770          *  (at least things won't be worse than what current code does, that
771          *  is blindly go & talk to the drive) and fix some issues like the
772          *  above.
773          *  
774          *  BenH.
775          */
776         if (wait_hwif_ready(hwif) == -EBUSY)
777                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
778
779         /*
780          * Need to probe slave device first to make it release PDIAG-.
781          */
782         for (unit = MAX_DRIVES - 1; unit >= 0; unit--) {
783                 ide_drive_t *drive = &hwif->drives[unit];
784                 drive->dn = (hwif->channel ? 2 : 0) + unit;
785                 (void) probe_for_drive(drive);
786                 if (drive->present && !hwif->present) {
787                         hwif->present = 1;
788                         if (hwif->chipset != ide_4drives ||
789                             !hwif->mate || 
790                             !hwif->mate->present) {
791                                 hwif_register(hwif);
792                         }
793                 }
794         }
795         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
796                 unsigned long timeout = jiffies + WAIT_WORSTCASE;
797                 u8 stat;
798
799                 printk(KERN_WARNING "%s: reset\n", hwif->name);
800                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
801                 udelay(10);
802                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
803                 do {
804                         msleep(50);
805                         stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
806                 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
807
808         }
809         local_irq_restore(flags);
810         /*
811          * Use cached IRQ number. It might be (and is...) changed by probe
812          * code above
813          */
814         if (irqd)
815                 enable_irq(irqd);
816
817         if (!hwif->present) {
818                 ide_hwif_release_regions(hwif);
819                 return;
820         }
821
822         if (fixup)
823                 fixup(hwif);
824
825         for (unit = 0; unit < MAX_DRIVES; ++unit) {
826                 ide_drive_t *drive = &hwif->drives[unit];
827
828                 if (drive->present) {
829                         if (drive->autotune == IDE_TUNE_AUTO)
830                                 ide_set_max_pio(drive);
831
832                         if (drive->autotune != IDE_TUNE_DEFAULT &&
833                             drive->autotune != IDE_TUNE_AUTO)
834                                 continue;
835
836                         drive->nice1 = 1;
837
838                         /*
839                          * MAJOR HACK BARF :-/
840                          *
841                          * FIXME: chipsets own this cruft!
842                          */
843                         /*
844                          * Move here to prevent module loading clashing.
845                          */
846         //              drive->autodma = hwif->autodma;
847                         if (hwif->ide_dma_check) {
848                                 /*
849                                  * Force DMAing for the beginning of the check.
850                                  * Some chipsets appear to do interesting
851                                  * things, if not checked and cleared.
852                                  *   PARANOIA!!!
853                                  */
854                                 hwif->dma_off_quietly(drive);
855 #ifdef CONFIG_IDEDMA_ONLYDISK
856                                 if (drive->media == ide_disk)
857 #endif
858                                         ide_set_dma(drive);
859                         }
860                 }
861         }
862
863         for (unit = 0; unit < MAX_DRIVES; ++unit) {
864                 ide_drive_t *drive = &hwif->drives[unit];
865
866                 if (hwif->no_io_32bit)
867                         drive->no_io_32bit = 1;
868                 else
869                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
870         }
871 }
872
873 static int hwif_init(ide_hwif_t *hwif);
874
875 int probe_hwif_init_with_fixup(ide_hwif_t *hwif, void (*fixup)(ide_hwif_t *hwif))
876 {
877         probe_hwif(hwif, fixup);
878
879         if (!hwif_init(hwif)) {
880                 printk(KERN_INFO "%s: failed to initialize IDE interface\n",
881                                  hwif->name);
882                 return -1;
883         }
884
885         if (hwif->present) {
886                 u16 unit = 0;
887                 int ret;
888
889                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
890                         ide_drive_t *drive = &hwif->drives[unit];
891                         /* For now don't attach absent drives, we may
892                            want them on default or a new "empty" class
893                            for hotplug reprobing ? */
894                         if (drive->present) {
895                                 ret = device_register(&drive->gendev);
896                                 if (ret < 0)
897                                         printk(KERN_WARNING "IDE: %s: "
898                                                 "device_register error: %d\n",
899                                                 __FUNCTION__, ret);
900                         }
901                 }
902         }
903         return 0;
904 }
905
906 int probe_hwif_init(ide_hwif_t *hwif)
907 {
908         return probe_hwif_init_with_fixup(hwif, NULL);
909 }
910
911 EXPORT_SYMBOL(probe_hwif_init);
912
913 #if MAX_HWIFS > 1
914 /*
915  * save_match() is used to simplify logic in init_irq() below.
916  *
917  * A loophole here is that we may not know about a particular
918  * hwif's irq until after that hwif is actually probed/initialized..
919  * This could be a problem for the case where an hwif is on a
920  * dual interface that requires serialization (eg. cmd640) and another
921  * hwif using one of the same irqs is initialized beforehand.
922  *
923  * This routine detects and reports such situations, but does not fix them.
924  */
925 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
926 {
927         ide_hwif_t *m = *match;
928
929         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
930                 if (!new->hwgroup)
931                         return;
932                 printk("%s: potential irq problem with %s and %s\n",
933                         hwif->name, new->name, m->name);
934         }
935         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
936                 *match = new;
937 }
938 #endif /* MAX_HWIFS > 1 */
939
940 /*
941  * init request queue
942  */
943 static int ide_init_queue(ide_drive_t *drive)
944 {
945         struct request_queue *q;
946         ide_hwif_t *hwif = HWIF(drive);
947         int max_sectors = 256;
948         int max_sg_entries = PRD_ENTRIES;
949
950         /*
951          *      Our default set up assumes the normal IDE case,
952          *      that is 64K segmenting, standard PRD setup
953          *      and LBA28. Some drivers then impose their own
954          *      limits and LBA48 we could raise it but as yet
955          *      do not.
956          */
957
958         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
959         if (!q)
960                 return 1;
961
962         q->queuedata = drive;
963         blk_queue_segment_boundary(q, 0xffff);
964
965         if (!hwif->rqsize) {
966                 if (hwif->no_lba48 || hwif->no_lba48_dma)
967                         hwif->rqsize = 256;
968                 else
969                         hwif->rqsize = 65536;
970         }
971         if (hwif->rqsize < max_sectors)
972                 max_sectors = hwif->rqsize;
973         blk_queue_max_sectors(q, max_sectors);
974
975 #ifdef CONFIG_PCI
976         /* When we have an IOMMU, we may have a problem where pci_map_sg()
977          * creates segments that don't completely match our boundary
978          * requirements and thus need to be broken up again. Because it
979          * doesn't align properly either, we may actually have to break up
980          * to more segments than what was we got in the first place, a max
981          * worst case is twice as many.
982          * This will be fixed once we teach pci_map_sg() about our boundary
983          * requirements, hopefully soon. *FIXME*
984          */
985         if (!PCI_DMA_BUS_IS_PHYS)
986                 max_sg_entries >>= 1;
987 #endif /* CONFIG_PCI */
988
989         blk_queue_max_hw_segments(q, max_sg_entries);
990         blk_queue_max_phys_segments(q, max_sg_entries);
991
992         /* assign drive queue */
993         drive->queue = q;
994
995         /* needs drive->queue to be set */
996         ide_toggle_bounce(drive, 1);
997
998         return 0;
999 }
1000
1001 /*
1002  * This routine sets up the irq for an ide interface, and creates a new
1003  * hwgroup for the irq/hwif if none was previously assigned.
1004  *
1005  * Much of the code is for correctly detecting/handling irq sharing
1006  * and irq serialization situations.  This is somewhat complex because
1007  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1008  *
1009  * The IRQF_DISABLED in sa_flags means ide_intr() is always entered with
1010  * interrupts completely disabled.  This can be bad for interrupt latency,
1011  * but anything else has led to problems on some machines.  We re-enable
1012  * interrupts as much as we can safely do in most places.
1013  */
1014 static int init_irq (ide_hwif_t *hwif)
1015 {
1016         unsigned int index;
1017         ide_hwgroup_t *hwgroup;
1018         ide_hwif_t *match = NULL;
1019
1020
1021         BUG_ON(in_interrupt());
1022         BUG_ON(irqs_disabled());        
1023         BUG_ON(hwif == NULL);
1024
1025         mutex_lock(&ide_cfg_mtx);
1026         hwif->hwgroup = NULL;
1027 #if MAX_HWIFS > 1
1028         /*
1029          * Group up with any other hwifs that share our irq(s).
1030          */
1031         for (index = 0; index < MAX_HWIFS; index++) {
1032                 ide_hwif_t *h = &ide_hwifs[index];
1033                 if (h->hwgroup) {  /* scan only initialized hwif's */
1034                         if (hwif->irq == h->irq) {
1035                                 hwif->sharing_irq = h->sharing_irq = 1;
1036                                 if (hwif->chipset != ide_pci ||
1037                                     h->chipset != ide_pci) {
1038                                         save_match(hwif, h, &match);
1039                                 }
1040                         }
1041                         if (hwif->serialized) {
1042                                 if (hwif->mate && hwif->mate->irq == h->irq)
1043                                         save_match(hwif, h, &match);
1044                         }
1045                         if (h->serialized) {
1046                                 if (h->mate && hwif->irq == h->mate->irq)
1047                                         save_match(hwif, h, &match);
1048                         }
1049                 }
1050         }
1051 #endif /* MAX_HWIFS > 1 */
1052         /*
1053          * If we are still without a hwgroup, then form a new one
1054          */
1055         if (match) {
1056                 hwgroup = match->hwgroup;
1057                 hwif->hwgroup = hwgroup;
1058                 /*
1059                  * Link us into the hwgroup.
1060                  * This must be done early, do ensure that unexpected_intr
1061                  * can find the hwif and prevent irq storms.
1062                  * No drives are attached to the new hwif, choose_drive
1063                  * can't do anything stupid (yet).
1064                  * Add ourself as the 2nd entry to the hwgroup->hwif
1065                  * linked list, the first entry is the hwif that owns
1066                  * hwgroup->handler - do not change that.
1067                  */
1068                 spin_lock_irq(&ide_lock);
1069                 hwif->next = hwgroup->hwif->next;
1070                 hwgroup->hwif->next = hwif;
1071                 spin_unlock_irq(&ide_lock);
1072         } else {
1073                 hwgroup = kmalloc_node(sizeof(ide_hwgroup_t),
1074                                         GFP_KERNEL | __GFP_ZERO,
1075                                         hwif_to_node(hwif->drives[0].hwif));
1076                 if (!hwgroup)
1077                         goto out_up;
1078
1079                 hwif->hwgroup = hwgroup;
1080
1081                 hwgroup->hwif     = hwif->next = hwif;
1082                 hwgroup->rq       = NULL;
1083                 hwgroup->handler  = NULL;
1084                 hwgroup->drive    = NULL;
1085                 hwgroup->busy     = 0;
1086                 init_timer(&hwgroup->timer);
1087                 hwgroup->timer.function = &ide_timer_expiry;
1088                 hwgroup->timer.data = (unsigned long) hwgroup;
1089         }
1090
1091         /*
1092          * Allocate the irq, if not already obtained for another hwif
1093          */
1094         if (!match || match->irq != hwif->irq) {
1095                 int sa = IRQF_DISABLED;
1096 #if defined(__mc68000__) || defined(CONFIG_APUS)
1097                 sa = IRQF_SHARED;
1098 #endif /* __mc68000__ || CONFIG_APUS */
1099
1100                 if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
1101                         sa = IRQF_SHARED;
1102 #ifndef CONFIG_IDEPCI_SHARE_IRQ
1103                         sa |= IRQF_DISABLED;
1104 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
1105                 }
1106
1107                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1108                         /* clear nIEN */
1109                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1110
1111                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1112                         goto out_unlink;
1113         }
1114
1115         /*
1116          * For any present drive:
1117          * - allocate the block device queue
1118          * - link drive into the hwgroup
1119          */
1120         for (index = 0; index < MAX_DRIVES; ++index) {
1121                 ide_drive_t *drive = &hwif->drives[index];
1122                 if (!drive->present)
1123                         continue;
1124                 if (ide_init_queue(drive)) {
1125                         printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1126                         continue;
1127                 }
1128                 spin_lock_irq(&ide_lock);
1129                 if (!hwgroup->drive) {
1130                         /* first drive for hwgroup. */
1131                         drive->next = drive;
1132                         hwgroup->drive = drive;
1133                         hwgroup->hwif = HWIF(hwgroup->drive);
1134                 } else {
1135                         drive->next = hwgroup->drive->next;
1136                         hwgroup->drive->next = drive;
1137                 }
1138                 spin_unlock_irq(&ide_lock);
1139         }
1140
1141 #if !defined(__mc68000__) && !defined(CONFIG_APUS)
1142         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1143                 hwif->io_ports[IDE_DATA_OFFSET],
1144                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1145                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1146 #else
1147         printk("%s at 0x%08lx on irq %d", hwif->name,
1148                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1149 #endif /* __mc68000__ && CONFIG_APUS */
1150         if (match)
1151                 printk(" (%sed with %s)",
1152                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1153         printk("\n");
1154         mutex_unlock(&ide_cfg_mtx);
1155         return 0;
1156 out_unlink:
1157         spin_lock_irq(&ide_lock);
1158         if (hwif->next == hwif) {
1159                 BUG_ON(match);
1160                 BUG_ON(hwgroup->hwif != hwif);
1161                 kfree(hwgroup);
1162         } else {
1163                 ide_hwif_t *g;
1164                 g = hwgroup->hwif;
1165                 while (g->next != hwif)
1166                         g = g->next;
1167                 g->next = hwif->next;
1168                 if (hwgroup->hwif == hwif) {
1169                         /* Impossible. */
1170                         printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1171                         hwgroup->hwif = g;
1172                 }
1173                 BUG_ON(hwgroup->hwif == hwif);
1174         }
1175         spin_unlock_irq(&ide_lock);
1176 out_up:
1177         mutex_unlock(&ide_cfg_mtx);
1178         return 1;
1179 }
1180
1181 static int ata_lock(dev_t dev, void *data)
1182 {
1183         /* FIXME: we want to pin hwif down */
1184         return 0;
1185 }
1186
1187 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1188 {
1189         ide_hwif_t *hwif = data;
1190         int unit = *part >> PARTN_BITS;
1191         ide_drive_t *drive = &hwif->drives[unit];
1192         if (!drive->present)
1193                 return NULL;
1194
1195         if (drive->media == ide_disk)
1196                 request_module("ide-disk");
1197         if (drive->scsi)
1198                 request_module("ide-scsi");
1199         if (drive->media == ide_cdrom || drive->media == ide_optical)
1200                 request_module("ide-cd");
1201         if (drive->media == ide_tape)
1202                 request_module("ide-tape");
1203         if (drive->media == ide_floppy)
1204                 request_module("ide-floppy");
1205
1206         return NULL;
1207 }
1208
1209 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1210 {
1211         struct gendisk *p = data;
1212         *part &= (1 << PARTN_BITS) - 1;
1213         return &p->kobj;
1214 }
1215
1216 static int exact_lock(dev_t dev, void *data)
1217 {
1218         struct gendisk *p = data;
1219
1220         if (!get_disk(p))
1221                 return -1;
1222         return 0;
1223 }
1224
1225 void ide_register_region(struct gendisk *disk)
1226 {
1227         blk_register_region(MKDEV(disk->major, disk->first_minor),
1228                             disk->minors, NULL, exact_match, exact_lock, disk);
1229 }
1230
1231 EXPORT_SYMBOL_GPL(ide_register_region);
1232
1233 void ide_unregister_region(struct gendisk *disk)
1234 {
1235         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1236                               disk->minors);
1237 }
1238
1239 EXPORT_SYMBOL_GPL(ide_unregister_region);
1240
1241 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1242 {
1243         ide_hwif_t *hwif = drive->hwif;
1244         unsigned int unit = (drive->select.all >> 4) & 1;
1245
1246         disk->major = hwif->major;
1247         disk->first_minor = unit << PARTN_BITS;
1248         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1249         disk->queue = drive->queue;
1250 }
1251
1252 EXPORT_SYMBOL_GPL(ide_init_disk);
1253
1254 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1255 {
1256         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1257
1258         if (drive == drive->next) {
1259                 /* special case: last drive from hwgroup. */
1260                 BUG_ON(hwgroup->drive != drive);
1261                 hwgroup->drive = NULL;
1262         } else {
1263                 ide_drive_t *walk;
1264
1265                 walk = hwgroup->drive;
1266                 while (walk->next != drive)
1267                         walk = walk->next;
1268                 walk->next = drive->next;
1269                 if (hwgroup->drive == drive) {
1270                         hwgroup->drive = drive->next;
1271                         hwgroup->hwif = hwgroup->drive->hwif;
1272                 }
1273         }
1274         BUG_ON(hwgroup->drive == drive);
1275 }
1276
1277 static void drive_release_dev (struct device *dev)
1278 {
1279         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1280
1281         spin_lock_irq(&ide_lock);
1282         ide_remove_drive_from_hwgroup(drive);
1283         kfree(drive->id);
1284         drive->id = NULL;
1285         drive->present = 0;
1286         /* Messed up locking ... */
1287         spin_unlock_irq(&ide_lock);
1288         blk_cleanup_queue(drive->queue);
1289         spin_lock_irq(&ide_lock);
1290         drive->queue = NULL;
1291         spin_unlock_irq(&ide_lock);
1292
1293         complete(&drive->gendev_rel_comp);
1294 }
1295
1296 /*
1297  * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1298  * after probing for drives, to allocate partition tables and other data
1299  * structures needed for the routines in genhd.c.  ide_geninit() gets called
1300  * somewhat later, during the partition check.
1301  */
1302 static void init_gendisk (ide_hwif_t *hwif)
1303 {
1304         unsigned int unit;
1305
1306         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1307                 ide_drive_t * drive = &hwif->drives[unit];
1308                 ide_add_generic_settings(drive);
1309                 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1310                          hwif->index,unit);
1311                 drive->gendev.parent = &hwif->gendev;
1312                 drive->gendev.bus = &ide_bus_type;
1313                 drive->gendev.driver_data = drive;
1314                 drive->gendev.release = drive_release_dev;
1315         }
1316         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1317                         THIS_MODULE, ata_probe, ata_lock, hwif);
1318 }
1319
1320 static int hwif_init(ide_hwif_t *hwif)
1321 {
1322         int old_irq;
1323
1324         /* Return success if no device is connected */
1325         if (!hwif->present)
1326                 return 1;
1327
1328         if (!hwif->irq) {
1329                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1330                 {
1331                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1332                         return (hwif->present = 0);
1333                 }
1334         }
1335 #ifdef CONFIG_BLK_DEV_HD
1336         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1337                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1338                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1339                 return (hwif->present = 0);
1340         }
1341 #endif /* CONFIG_BLK_DEV_HD */
1342
1343         /* we set it back to 1 if all is ok below */    
1344         hwif->present = 0;
1345
1346         if (register_blkdev(hwif->major, hwif->name))
1347                 return 0;
1348
1349         if (!hwif->sg_max_nents)
1350                 hwif->sg_max_nents = PRD_ENTRIES;
1351
1352         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1353                                  GFP_KERNEL);
1354         if (!hwif->sg_table) {
1355                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1356                 goto out;
1357         }
1358         
1359         if (init_irq(hwif) == 0)
1360                 goto done;
1361
1362         old_irq = hwif->irq;
1363         /*
1364          *      It failed to initialise. Find the default IRQ for 
1365          *      this port and try that.
1366          */
1367         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1368                 printk("%s: Disabled unable to get IRQ %d.\n",
1369                         hwif->name, old_irq);
1370                 goto out;
1371         }
1372         if (init_irq(hwif)) {
1373                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1374                         hwif->name, old_irq, hwif->irq);
1375                 goto out;
1376         }
1377         printk("%s: probed IRQ %d failed, using default.\n",
1378                 hwif->name, hwif->irq);
1379
1380 done:
1381         init_gendisk(hwif);
1382
1383         ide_acpi_init(hwif);
1384
1385         hwif->present = 1;      /* success */
1386         return 1;
1387
1388 out:
1389         unregister_blkdev(hwif->major, hwif->name);
1390         return 0;
1391 }
1392
1393 int ideprobe_init (void)
1394 {
1395         unsigned int index;
1396         int probe[MAX_HWIFS];
1397
1398         memset(probe, 0, MAX_HWIFS * sizeof(int));
1399         for (index = 0; index < MAX_HWIFS; ++index)
1400                 probe[index] = !ide_hwifs[index].present;
1401
1402         for (index = 0; index < MAX_HWIFS; ++index)
1403                 if (probe[index])
1404                         probe_hwif(&ide_hwifs[index], NULL);
1405         for (index = 0; index < MAX_HWIFS; ++index)
1406                 if (probe[index])
1407                         hwif_init(&ide_hwifs[index]);
1408         for (index = 0; index < MAX_HWIFS; ++index) {
1409                 if (probe[index]) {
1410                         ide_hwif_t *hwif = &ide_hwifs[index];
1411                         int unit;
1412                         if (!hwif->present)
1413                                 continue;
1414                         if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1415                                 hwif->chipset = ide_generic;
1416                         for (unit = 0; unit < MAX_DRIVES; ++unit)
1417                                 if (hwif->drives[unit].present) {
1418                                         int ret = device_register(
1419                                                 &hwif->drives[unit].gendev);
1420                                         if (ret < 0)
1421                                                 printk(KERN_WARNING "IDE: %s: "
1422                                                         "device_register error: %d\n",
1423                                                         __FUNCTION__, ret);
1424                                 }
1425                 }
1426         }
1427         for (index = 0; index < MAX_HWIFS; ++index)
1428                 if (probe[index])
1429                         ide_proc_register_port(&ide_hwifs[index]);
1430         return 0;
1431 }
1432
1433 EXPORT_SYMBOL_GPL(ideprobe_init);