Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-lguest
[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 #include <linux/scatterlist.h>
51
52 #include <asm/byteorder.h>
53 #include <asm/irq.h>
54 #include <asm/uaccess.h>
55 #include <asm/io.h>
56
57 /**
58  *      generic_id              -       add a generic drive id
59  *      @drive: drive to make an ID block for
60  *      
61  *      Add a fake id field to the drive we are passed. This allows
62  *      use to skip a ton of NULL checks (which people always miss) 
63  *      and make drive properties unconditional outside of this file
64  */
65  
66 static void generic_id(ide_drive_t *drive)
67 {
68         drive->id->cyls = drive->cyl;
69         drive->id->heads = drive->head;
70         drive->id->sectors = drive->sect;
71         drive->id->cur_cyls = drive->cyl;
72         drive->id->cur_heads = drive->head;
73         drive->id->cur_sectors = drive->sect;
74 }
75
76 static void ide_disk_init_chs(ide_drive_t *drive)
77 {
78         struct hd_driveid *id = drive->id;
79
80         /* Extract geometry if we did not already have one for the drive */
81         if (!drive->cyl || !drive->head || !drive->sect) {
82                 drive->cyl  = drive->bios_cyl  = id->cyls;
83                 drive->head = drive->bios_head = id->heads;
84                 drive->sect = drive->bios_sect = id->sectors;
85         }
86
87         /* Handle logical geometry translation by the drive */
88         if ((id->field_valid & 1) && id->cur_cyls &&
89             id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
90                 drive->cyl  = id->cur_cyls;
91                 drive->head = id->cur_heads;
92                 drive->sect = id->cur_sectors;
93         }
94
95         /* Use physical geometry if what we have still makes no sense */
96         if (drive->head > 16 && id->heads && id->heads <= 16) {
97                 drive->cyl  = id->cyls;
98                 drive->head = id->heads;
99                 drive->sect = id->sectors;
100         }
101 }
102
103 static void ide_disk_init_mult_count(ide_drive_t *drive)
104 {
105         struct hd_driveid *id = drive->id;
106
107         drive->mult_count = 0;
108         if (id->max_multsect) {
109 #ifdef CONFIG_IDEDISK_MULTI_MODE
110                 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
111                 id->multsect_valid = id->multsect ? 1 : 0;
112                 drive->mult_req = id->multsect_valid ? id->max_multsect : INITIAL_MULT_COUNT;
113                 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
114 #else   /* original, pre IDE-NFG, per request of AC */
115                 drive->mult_req = INITIAL_MULT_COUNT;
116                 if (drive->mult_req > id->max_multsect)
117                         drive->mult_req = id->max_multsect;
118                 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
119                         drive->special.b.set_multmode = 1;
120 #endif
121         }
122 }
123
124 /**
125  *      do_identify     -       identify a drive
126  *      @drive: drive to identify 
127  *      @cmd: command used
128  *
129  *      Called when we have issued a drive identify command to
130  *      read and parse the results. This function is run with
131  *      interrupts disabled. 
132  */
133  
134 static inline void do_identify (ide_drive_t *drive, u8 cmd)
135 {
136         ide_hwif_t *hwif = HWIF(drive);
137         int bswap = 1;
138         struct hd_driveid *id;
139
140         id = drive->id;
141         /* read 512 bytes of id info */
142         hwif->ata_input_data(drive, id, SECTOR_WORDS);
143
144         drive->id_read = 1;
145         local_irq_enable();
146         ide_fix_driveid(id);
147
148 #if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
149         /*
150          * EATA SCSI controllers do a hardware ATA emulation:
151          * Ignore them if there is a driver for them available.
152          */
153         if ((id->model[0] == 'P' && id->model[1] == 'M') ||
154             (id->model[0] == 'S' && id->model[1] == 'K')) {
155                 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
156                 goto err_misc;
157         }
158 #endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
159
160         /*
161          *  WIN_IDENTIFY returns little-endian info,
162          *  WIN_PIDENTIFY *usually* returns little-endian info.
163          */
164         if (cmd == WIN_PIDENTIFY) {
165                 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
166                  || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
167                  || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
168                         /* Vertos drives may still be weird */
169                         bswap ^= 1;     
170         }
171         ide_fixstring(id->model,     sizeof(id->model),     bswap);
172         ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
173         ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
174
175         if (strstr(id->model, "E X A B Y T E N E S T"))
176                 goto err_misc;
177
178         /* we depend on this a lot! */
179         id->model[sizeof(id->model)-1] = '\0';
180         printk("%s: %s, ", drive->name, id->model);
181         drive->present = 1;
182         drive->dead = 0;
183
184         /*
185          * Check for an ATAPI device
186          */
187         if (cmd == WIN_PIDENTIFY) {
188                 u8 type = (id->config >> 8) & 0x1f;
189                 printk("ATAPI ");
190                 switch (type) {
191                         case ide_floppy:
192                                 if (!strstr(id->model, "CD-ROM")) {
193                                         if (!strstr(id->model, "oppy") &&
194                                             !strstr(id->model, "poyp") &&
195                                             !strstr(id->model, "ZIP"))
196                                                 printk("cdrom or floppy?, assuming ");
197                                         if (drive->media != ide_cdrom) {
198                                                 printk ("FLOPPY");
199                                                 drive->removable = 1;
200                                                 break;
201                                         }
202                                 }
203                                 /* Early cdrom models used zero */
204                                 type = ide_cdrom;
205                         case ide_cdrom:
206                                 drive->removable = 1;
207 #ifdef CONFIG_PPC
208                                 /* kludge for Apple PowerBook internal zip */
209                                 if (!strstr(id->model, "CD-ROM") &&
210                                     strstr(id->model, "ZIP")) {
211                                         printk ("FLOPPY");
212                                         type = ide_floppy;
213                                         break;
214                                 }
215 #endif
216                                 printk ("CD/DVD-ROM");
217                                 break;
218                         case ide_tape:
219                                 printk ("TAPE");
220                                 break;
221                         case ide_optical:
222                                 printk ("OPTICAL");
223                                 drive->removable = 1;
224                                 break;
225                         default:
226                                 printk("UNKNOWN (type %d)", type);
227                                 break;
228                 }
229                 printk (" drive\n");
230                 drive->media = type;
231                 /* an ATAPI device ignores DRDY */
232                 drive->ready_stat = 0;
233                 return;
234         }
235
236         /*
237          * Not an ATAPI device: looks like a "regular" hard disk
238          */
239
240         /*
241          * 0x848a = CompactFlash device
242          * These are *not* removable in Linux definition of the term
243          */
244
245         if ((id->config != 0x848a) && (id->config & (1<<7)))
246                 drive->removable = 1;
247
248         drive->media = ide_disk;
249         printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
250         QUIRK_LIST(drive);
251         return;
252
253 err_misc:
254         kfree(id);
255         drive->present = 0;
256         return;
257 }
258
259 /**
260  *      actual_try_to_identify  -       send ata/atapi identify
261  *      @drive: drive to identify
262  *      @cmd: command to use
263  *
264  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
265  *      and waits for a response.  It also monitors irqs while this is
266  *      happening, in hope of automatically determining which one is
267  *      being used by the interface.
268  *
269  *      Returns:        0  device was identified
270  *                      1  device timed-out (no response to identify request)
271  *                      2  device aborted the command (refused to identify itself)
272  */
273
274 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
275 {
276         ide_hwif_t *hwif = HWIF(drive);
277         int rc;
278         unsigned long hd_status;
279         unsigned long timeout;
280         u8 s = 0, a = 0;
281
282         /* take a deep breath */
283         msleep(50);
284
285         if (IDE_CONTROL_REG) {
286                 a = hwif->INB(IDE_ALTSTATUS_REG);
287                 s = hwif->INB(IDE_STATUS_REG);
288                 if ((a ^ s) & ~INDEX_STAT) {
289                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
290                                 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
291                         /* ancient Seagate drives, broken interfaces */
292                         hd_status = IDE_STATUS_REG;
293                 } else {
294                         /* use non-intrusive polling */
295                         hd_status = IDE_ALTSTATUS_REG;
296                 }
297         } else
298                 hd_status = IDE_STATUS_REG;
299
300         /* set features register for atapi
301          * identify command to be sure of reply
302          */
303         if ((cmd == WIN_PIDENTIFY))
304                 /* disable dma & overlap */
305                 hwif->OUTB(0, IDE_FEATURE_REG);
306
307         /* ask drive for ID */
308         hwif->OUTB(cmd, IDE_COMMAND_REG);
309
310         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
311         timeout += jiffies;
312         do {
313                 if (time_after(jiffies, timeout)) {
314                         /* drive timed-out */
315                         return 1;
316                 }
317                 /* give drive a breather */
318                 msleep(50);
319         } while ((hwif->INB(hd_status)) & BUSY_STAT);
320
321         /* wait for IRQ and DRQ_STAT */
322         msleep(50);
323         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
324                 unsigned long flags;
325
326                 /* local CPU only; some systems need this */
327                 local_irq_save(flags);
328                 /* drive returned ID */
329                 do_identify(drive, cmd);
330                 /* drive responded with ID */
331                 rc = 0;
332                 /* clear drive IRQ */
333                 (void) hwif->INB(IDE_STATUS_REG);
334                 local_irq_restore(flags);
335         } else {
336                 /* drive refused ID */
337                 rc = 2;
338         }
339         return rc;
340 }
341
342 /**
343  *      try_to_identify -       try to identify a drive
344  *      @drive: drive to probe
345  *      @cmd: command to use
346  *
347  *      Issue the identify command and then do IRQ probing to
348  *      complete the identification when needed by finding the
349  *      IRQ the drive is attached to
350  */
351  
352 static int try_to_identify (ide_drive_t *drive, u8 cmd)
353 {
354         ide_hwif_t *hwif = HWIF(drive);
355         int retval;
356         int autoprobe = 0;
357         unsigned long cookie = 0;
358
359         /*
360          * Disable device irq unless we need to
361          * probe for it. Otherwise we'll get spurious
362          * interrupts during the identify-phase that
363          * the irq handler isn't expecting.
364          */
365         if (IDE_CONTROL_REG) {
366                 u8 ctl = drive->ctl | 2;
367                 if (!hwif->irq) {
368                         autoprobe = 1;
369                         cookie = probe_irq_on();
370                         /* enable device irq */
371                         ctl &= ~2;
372                 }
373                 hwif->OUTB(ctl, IDE_CONTROL_REG);
374         }
375
376         retval = actual_try_to_identify(drive, cmd);
377
378         if (autoprobe) {
379                 int irq;
380                 /* mask device irq */
381                 hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
382                 /* clear drive IRQ */
383                 (void) hwif->INB(IDE_STATUS_REG);
384                 udelay(5);
385                 irq = probe_irq_off(cookie);
386                 if (!hwif->irq) {
387                         if (irq > 0) {
388                                 hwif->irq = irq;
389                         } else {
390                                 /* Mmmm.. multiple IRQs..
391                                  * don't know which was ours
392                                  */
393                                 printk("%s: IRQ probe failed (0x%lx)\n",
394                                         drive->name, cookie);
395                         }
396                 }
397         }
398         return retval;
399 }
400
401
402 /**
403  *      do_probe                -       probe an IDE device
404  *      @drive: drive to probe
405  *      @cmd: command to use
406  *
407  *      do_probe() has the difficult job of finding a drive if it exists,
408  *      without getting hung up if it doesn't exist, without trampling on
409  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
410  *
411  *      If a drive is "known" to exist (from CMOS or kernel parameters),
412  *      but does not respond right away, the probe will "hang in there"
413  *      for the maximum wait time (about 30 seconds), otherwise it will
414  *      exit much more quickly.
415  *
416  * Returns:     0  device was identified
417  *              1  device timed-out (no response to identify request)
418  *              2  device aborted the command (refused to identify itself)
419  *              3  bad status from device (possible for ATAPI drives)
420  *              4  probe was not attempted because failure was obvious
421  */
422
423 static int do_probe (ide_drive_t *drive, u8 cmd)
424 {
425         int rc;
426         ide_hwif_t *hwif = HWIF(drive);
427
428         if (drive->present) {
429                 /* avoid waiting for inappropriate probes */
430                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
431                         return 4;
432         }
433 #ifdef DEBUG
434         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
435                 drive->name, drive->present, drive->media,
436                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
437 #endif
438
439         /* needed for some systems
440          * (e.g. crw9624 as drive0 with disk as slave)
441          */
442         msleep(50);
443         SELECT_DRIVE(drive);
444         msleep(50);
445         if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
446                 if (drive->select.b.unit != 0) {
447                         /* exit with drive0 selected */
448                         SELECT_DRIVE(&hwif->drives[0]);
449                         /* allow BUSY_STAT to assert & clear */
450                         msleep(50);
451                 }
452                 /* no i/f present: mmm.. this should be a 4 -ml */
453                 return 3;
454         }
455
456         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
457             drive->present || cmd == WIN_PIDENTIFY) {
458                 /* send cmd and wait */
459                 if ((rc = try_to_identify(drive, cmd))) {
460                         /* failed: try again */
461                         rc = try_to_identify(drive,cmd);
462                 }
463                 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
464                         return 4;
465
466                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
467                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
468                         (drive->autotune == IDE_TUNE_AUTO))) {
469                         unsigned long timeout;
470                         printk("%s: no response (status = 0x%02x), "
471                                 "resetting drive\n", drive->name,
472                                 hwif->INB(IDE_STATUS_REG));
473                         msleep(50);
474                         hwif->OUTB(drive->select.all, IDE_SELECT_REG);
475                         msleep(50);
476                         hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
477                         timeout = jiffies;
478                         while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
479                                time_before(jiffies, timeout + WAIT_WORSTCASE))
480                                 msleep(50);
481                         rc = try_to_identify(drive, cmd);
482                 }
483                 if (rc == 1)
484                         printk("%s: no response (status = 0x%02x)\n",
485                                 drive->name, hwif->INB(IDE_STATUS_REG));
486                 /* ensure drive irq is clear */
487                 (void) hwif->INB(IDE_STATUS_REG);
488         } else {
489                 /* not present or maybe ATAPI */
490                 rc = 3;
491         }
492         if (drive->select.b.unit != 0) {
493                 /* exit with drive0 selected */
494                 SELECT_DRIVE(&hwif->drives[0]);
495                 msleep(50);
496                 /* ensure drive irq is clear */
497                 (void) hwif->INB(IDE_STATUS_REG);
498         }
499         return rc;
500 }
501
502 /*
503  *
504  */
505 static void enable_nest (ide_drive_t *drive)
506 {
507         ide_hwif_t *hwif = HWIF(drive);
508         unsigned long timeout;
509
510         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
511         SELECT_DRIVE(drive);
512         msleep(50);
513         hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
514         timeout = jiffies + WAIT_WORSTCASE;
515         do {
516                 if (time_after(jiffies, timeout)) {
517                         printk("failed (timeout)\n");
518                         return;
519                 }
520                 msleep(50);
521         } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
522
523         msleep(50);
524
525         if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
526                 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
527         } else {
528                 printk("success\n");
529         }
530
531         /* if !(success||timed-out) */
532         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
533                 /* look for ATAPI device */
534                 (void) do_probe(drive, WIN_PIDENTIFY);
535         }
536 }
537
538 /**
539  *      probe_for_drives        -       upper level drive probe
540  *      @drive: drive to probe for
541  *
542  *      probe_for_drive() tests for existence of a given drive using do_probe()
543  *      and presents things to the user as needed.
544  *
545  *      Returns:        0  no device was found
546  *                      1  device was found (note: drive->present might
547  *                         still be 0)
548  */
549  
550 static inline u8 probe_for_drive (ide_drive_t *drive)
551 {
552         /*
553          *      In order to keep things simple we have an id
554          *      block for all drives at all times. If the device
555          *      is pre ATA or refuses ATA/ATAPI identify we
556          *      will add faked data to this.
557          *
558          *      Also note that 0 everywhere means "can't do X"
559          */
560  
561         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
562         drive->id_read = 0;
563         if(drive->id == NULL)
564         {
565                 printk(KERN_ERR "ide: out of memory for id data.\n");
566                 return 0;
567         }
568         strcpy(drive->id->model, "UNKNOWN");
569         
570         /* skip probing? */
571         if (!drive->noprobe)
572         {
573                 /* if !(success||timed-out) */
574                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
575                         /* look for ATAPI device */
576                         (void) do_probe(drive, WIN_PIDENTIFY);
577                 }
578                 if (!drive->present)
579                         /* drive not found */
580                         return 0;
581                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
582                         enable_nest(drive);
583         
584                 /* identification failed? */
585                 if (!drive->id_read) {
586                         if (drive->media == ide_disk) {
587                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
588                                         drive->name, drive->cyl,
589                                         drive->head, drive->sect);
590                         } else if (drive->media == ide_cdrom) {
591                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
592                         } else {
593                                 /* nuke it */
594                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
595                                 drive->present = 0;
596                         }
597                 }
598                 /* drive was found */
599         }
600         if(!drive->present)
601                 return 0;
602         /* The drive wasn't being helpful. Add generic info only */
603         if (drive->id_read == 0) {
604                 generic_id(drive);
605                 return 1;
606         }
607
608         if (drive->media == ide_disk) {
609                 ide_disk_init_chs(drive);
610                 ide_disk_init_mult_count(drive);
611         }
612
613         return drive->present;
614 }
615
616 static void hwif_release_dev (struct device *dev)
617 {
618         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
619
620         complete(&hwif->gendev_rel_comp);
621 }
622
623 static void hwif_register (ide_hwif_t *hwif)
624 {
625         int ret;
626
627         /* register with global device tree */
628         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
629         hwif->gendev.driver_data = hwif;
630         if (hwif->gendev.parent == NULL) {
631                 if (hwif->pci_dev)
632                         hwif->gendev.parent = &hwif->pci_dev->dev;
633                 else
634                         /* Would like to do = &device_legacy */
635                         hwif->gendev.parent = NULL;
636         }
637         hwif->gendev.release = hwif_release_dev;
638         ret = device_register(&hwif->gendev);
639         if (ret < 0)
640                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
641                         __FUNCTION__, ret);
642 }
643
644 static int wait_hwif_ready(ide_hwif_t *hwif)
645 {
646         int rc;
647
648         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
649
650         /* Let HW settle down a bit from whatever init state we
651          * come from */
652         mdelay(2);
653
654         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
655          * I know of at least one disk who takes 31 seconds, I use 35
656          * here to be safe
657          */
658         rc = ide_wait_not_busy(hwif, 35000);
659         if (rc)
660                 return rc;
661
662         /* Now make sure both master & slave are ready */
663         SELECT_DRIVE(&hwif->drives[0]);
664         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
665         mdelay(2);
666         rc = ide_wait_not_busy(hwif, 35000);
667         if (rc)
668                 return rc;
669         SELECT_DRIVE(&hwif->drives[1]);
670         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
671         mdelay(2);
672         rc = ide_wait_not_busy(hwif, 35000);
673
674         /* Exit function with master reselected (let's be sane) */
675         SELECT_DRIVE(&hwif->drives[0]);
676         
677         return rc;
678 }
679
680 /**
681  *      ide_undecoded_slave     -       look for bad CF adapters
682  *      @hwif: interface
683  *
684  *      Analyse the drives on the interface and attempt to decide if we
685  *      have the same drive viewed twice. This occurs with crap CF adapters
686  *      and PCMCIA sometimes.
687  */
688
689 void ide_undecoded_slave(ide_hwif_t *hwif)
690 {
691         ide_drive_t *drive0 = &hwif->drives[0];
692         ide_drive_t *drive1 = &hwif->drives[1];
693
694         if (drive0->present == 0 || drive1->present == 0)
695                 return;
696
697         /* If the models don't match they are not the same product */
698         if (strcmp(drive0->id->model, drive1->id->model))
699                 return;
700
701         /* Serial numbers do not match */
702         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
703                 return;
704
705         /* No serial number, thankfully very rare for CF */
706         if (drive0->id->serial_no[0] == 0)
707                 return;
708
709         /* Appears to be an IDE flash adapter with decode bugs */
710         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
711
712         drive1->present = 0;
713 }
714
715 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
716
717 /*
718  * This routine only knows how to look for drive units 0 and 1
719  * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
720  */
721 static void probe_hwif(ide_hwif_t *hwif)
722 {
723         unsigned long flags;
724         unsigned int irqd;
725         int unit;
726
727         if (hwif->noprobe)
728                 return;
729
730         if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
731             (ide_hwif_request_regions(hwif))) {
732                 u16 msgout = 0;
733                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
734                         ide_drive_t *drive = &hwif->drives[unit];
735                         if (drive->present) {
736                                 drive->present = 0;
737                                 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
738                                         drive->name);
739                                 msgout = 1;
740                         }
741                 }
742                 if (!msgout)
743                         printk(KERN_ERR "%s: ports already in use, skipping probe\n",
744                                 hwif->name);
745                 return; 
746         }
747
748         /*
749          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
750          * we'll install our IRQ driver much later...
751          */
752         irqd = hwif->irq;
753         if (irqd)
754                 disable_irq(hwif->irq);
755
756         local_irq_set(flags);
757
758         /* This is needed on some PPCs and a bunch of BIOS-less embedded
759          * platforms. Typical cases are:
760          * 
761          *  - The firmware hard reset the disk before booting the kernel,
762          *    the drive is still doing it's poweron-reset sequence, that
763          *    can take up to 30 seconds
764          *  - The firmware does nothing (or no firmware), the device is
765          *    still in POST state (same as above actually).
766          *  - Some CD/DVD/Writer combo drives tend to drive the bus during
767          *    their reset sequence even when they are non-selected slave
768          *    devices, thus preventing discovery of the main HD
769          *    
770          *  Doing this wait-for-busy should not harm any existing configuration
771          *  (at least things won't be worse than what current code does, that
772          *  is blindly go & talk to the drive) and fix some issues like the
773          *  above.
774          *  
775          *  BenH.
776          */
777         if (wait_hwif_ready(hwif) == -EBUSY)
778                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
779
780         /*
781          * Need to probe slave device first to make it release PDIAG-.
782          */
783         for (unit = MAX_DRIVES - 1; unit >= 0; unit--) {
784                 ide_drive_t *drive = &hwif->drives[unit];
785                 drive->dn = (hwif->channel ? 2 : 0) + unit;
786                 (void) probe_for_drive(drive);
787                 if (drive->present && !hwif->present) {
788                         hwif->present = 1;
789                         if (hwif->chipset != ide_4drives ||
790                             !hwif->mate || 
791                             !hwif->mate->present) {
792                                 hwif_register(hwif);
793                         }
794                 }
795         }
796         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
797                 unsigned long timeout = jiffies + WAIT_WORSTCASE;
798                 u8 stat;
799
800                 printk(KERN_WARNING "%s: reset\n", hwif->name);
801                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
802                 udelay(10);
803                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
804                 do {
805                         msleep(50);
806                         stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
807                 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
808
809         }
810         local_irq_restore(flags);
811         /*
812          * Use cached IRQ number. It might be (and is...) changed by probe
813          * code above
814          */
815         if (irqd)
816                 enable_irq(irqd);
817
818         if (!hwif->present) {
819                 ide_hwif_release_regions(hwif);
820                 return;
821         }
822
823         if (hwif->fixup)
824                 hwif->fixup(hwif);
825
826         for (unit = 0; unit < MAX_DRIVES; ++unit) {
827                 ide_drive_t *drive = &hwif->drives[unit];
828
829                 if (drive->present) {
830                         if (drive->autotune == IDE_TUNE_AUTO)
831                                 ide_set_max_pio(drive);
832
833                         if (drive->autotune != IDE_TUNE_DEFAULT &&
834                             drive->autotune != IDE_TUNE_AUTO)
835                                 continue;
836
837                         drive->nice1 = 1;
838
839                         if (hwif->ide_dma_on) {
840                                 /*
841                                  * Force DMAing for the beginning of the check.
842                                  * Some chipsets appear to do interesting
843                                  * things, if not checked and cleared.
844                                  *   PARANOIA!!!
845                                  */
846                                 hwif->dma_off_quietly(drive);
847                                 ide_set_dma(drive);
848                         }
849                 }
850         }
851
852         for (unit = 0; unit < MAX_DRIVES; ++unit) {
853                 ide_drive_t *drive = &hwif->drives[unit];
854
855                 if (hwif->no_io_32bit)
856                         drive->no_io_32bit = 1;
857                 else
858                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
859         }
860 }
861
862 static int hwif_init(ide_hwif_t *hwif);
863 static void hwif_register_devices(ide_hwif_t *hwif);
864
865 static int probe_hwif_init(ide_hwif_t *hwif)
866 {
867         probe_hwif(hwif);
868
869         if (!hwif_init(hwif)) {
870                 printk(KERN_INFO "%s: failed to initialize IDE interface\n",
871                                  hwif->name);
872                 return -1;
873         }
874
875         if (hwif->present)
876                 hwif_register_devices(hwif);
877
878         return 0;
879 }
880
881 #if MAX_HWIFS > 1
882 /*
883  * save_match() is used to simplify logic in init_irq() below.
884  *
885  * A loophole here is that we may not know about a particular
886  * hwif's irq until after that hwif is actually probed/initialized..
887  * This could be a problem for the case where an hwif is on a
888  * dual interface that requires serialization (eg. cmd640) and another
889  * hwif using one of the same irqs is initialized beforehand.
890  *
891  * This routine detects and reports such situations, but does not fix them.
892  */
893 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
894 {
895         ide_hwif_t *m = *match;
896
897         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
898                 if (!new->hwgroup)
899                         return;
900                 printk("%s: potential irq problem with %s and %s\n",
901                         hwif->name, new->name, m->name);
902         }
903         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
904                 *match = new;
905 }
906 #endif /* MAX_HWIFS > 1 */
907
908 /*
909  * init request queue
910  */
911 static int ide_init_queue(ide_drive_t *drive)
912 {
913         struct request_queue *q;
914         ide_hwif_t *hwif = HWIF(drive);
915         int max_sectors = 256;
916         int max_sg_entries = PRD_ENTRIES;
917
918         /*
919          *      Our default set up assumes the normal IDE case,
920          *      that is 64K segmenting, standard PRD setup
921          *      and LBA28. Some drivers then impose their own
922          *      limits and LBA48 we could raise it but as yet
923          *      do not.
924          */
925
926         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
927         if (!q)
928                 return 1;
929
930         q->queuedata = drive;
931         blk_queue_segment_boundary(q, 0xffff);
932
933         if (!hwif->rqsize) {
934                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
935                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
936                         hwif->rqsize = 256;
937                 else
938                         hwif->rqsize = 65536;
939         }
940         if (hwif->rqsize < max_sectors)
941                 max_sectors = hwif->rqsize;
942         blk_queue_max_sectors(q, max_sectors);
943
944 #ifdef CONFIG_PCI
945         /* When we have an IOMMU, we may have a problem where pci_map_sg()
946          * creates segments that don't completely match our boundary
947          * requirements and thus need to be broken up again. Because it
948          * doesn't align properly either, we may actually have to break up
949          * to more segments than what was we got in the first place, a max
950          * worst case is twice as many.
951          * This will be fixed once we teach pci_map_sg() about our boundary
952          * requirements, hopefully soon. *FIXME*
953          */
954         if (!PCI_DMA_BUS_IS_PHYS)
955                 max_sg_entries >>= 1;
956 #endif /* CONFIG_PCI */
957
958         blk_queue_max_hw_segments(q, max_sg_entries);
959         blk_queue_max_phys_segments(q, max_sg_entries);
960
961         /* assign drive queue */
962         drive->queue = q;
963
964         /* needs drive->queue to be set */
965         ide_toggle_bounce(drive, 1);
966
967         return 0;
968 }
969
970 /*
971  * This routine sets up the irq for an ide interface, and creates a new
972  * hwgroup for the irq/hwif if none was previously assigned.
973  *
974  * Much of the code is for correctly detecting/handling irq sharing
975  * and irq serialization situations.  This is somewhat complex because
976  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
977  *
978  * The IRQF_DISABLED in sa_flags means ide_intr() is always entered with
979  * interrupts completely disabled.  This can be bad for interrupt latency,
980  * but anything else has led to problems on some machines.  We re-enable
981  * interrupts as much as we can safely do in most places.
982  */
983 static int init_irq (ide_hwif_t *hwif)
984 {
985         unsigned int index;
986         ide_hwgroup_t *hwgroup;
987         ide_hwif_t *match = NULL;
988
989
990         BUG_ON(in_interrupt());
991         BUG_ON(irqs_disabled());        
992         BUG_ON(hwif == NULL);
993
994         mutex_lock(&ide_cfg_mtx);
995         hwif->hwgroup = NULL;
996 #if MAX_HWIFS > 1
997         /*
998          * Group up with any other hwifs that share our irq(s).
999          */
1000         for (index = 0; index < MAX_HWIFS; index++) {
1001                 ide_hwif_t *h = &ide_hwifs[index];
1002                 if (h->hwgroup) {  /* scan only initialized hwif's */
1003                         if (hwif->irq == h->irq) {
1004                                 hwif->sharing_irq = h->sharing_irq = 1;
1005                                 if (hwif->chipset != ide_pci ||
1006                                     h->chipset != ide_pci) {
1007                                         save_match(hwif, h, &match);
1008                                 }
1009                         }
1010                         if (hwif->serialized) {
1011                                 if (hwif->mate && hwif->mate->irq == h->irq)
1012                                         save_match(hwif, h, &match);
1013                         }
1014                         if (h->serialized) {
1015                                 if (h->mate && hwif->irq == h->mate->irq)
1016                                         save_match(hwif, h, &match);
1017                         }
1018                 }
1019         }
1020 #endif /* MAX_HWIFS > 1 */
1021         /*
1022          * If we are still without a hwgroup, then form a new one
1023          */
1024         if (match) {
1025                 hwgroup = match->hwgroup;
1026                 hwif->hwgroup = hwgroup;
1027                 /*
1028                  * Link us into the hwgroup.
1029                  * This must be done early, do ensure that unexpected_intr
1030                  * can find the hwif and prevent irq storms.
1031                  * No drives are attached to the new hwif, choose_drive
1032                  * can't do anything stupid (yet).
1033                  * Add ourself as the 2nd entry to the hwgroup->hwif
1034                  * linked list, the first entry is the hwif that owns
1035                  * hwgroup->handler - do not change that.
1036                  */
1037                 spin_lock_irq(&ide_lock);
1038                 hwif->next = hwgroup->hwif->next;
1039                 hwgroup->hwif->next = hwif;
1040                 spin_unlock_irq(&ide_lock);
1041         } else {
1042                 hwgroup = kmalloc_node(sizeof(ide_hwgroup_t),
1043                                         GFP_KERNEL | __GFP_ZERO,
1044                                         hwif_to_node(hwif->drives[0].hwif));
1045                 if (!hwgroup)
1046                         goto out_up;
1047
1048                 hwif->hwgroup = hwgroup;
1049
1050                 hwgroup->hwif     = hwif->next = hwif;
1051                 hwgroup->rq       = NULL;
1052                 hwgroup->handler  = NULL;
1053                 hwgroup->drive    = NULL;
1054                 hwgroup->busy     = 0;
1055                 init_timer(&hwgroup->timer);
1056                 hwgroup->timer.function = &ide_timer_expiry;
1057                 hwgroup->timer.data = (unsigned long) hwgroup;
1058         }
1059
1060         /*
1061          * Allocate the irq, if not already obtained for another hwif
1062          */
1063         if (!match || match->irq != hwif->irq) {
1064                 int sa = IRQF_DISABLED;
1065 #if defined(__mc68000__) || defined(CONFIG_APUS)
1066                 sa = IRQF_SHARED;
1067 #endif /* __mc68000__ || CONFIG_APUS */
1068
1069                 if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
1070                         sa = IRQF_SHARED;
1071 #ifndef CONFIG_IDEPCI_SHARE_IRQ
1072                         sa |= IRQF_DISABLED;
1073 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
1074                 }
1075
1076                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1077                         /* clear nIEN */
1078                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1079
1080                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1081                         goto out_unlink;
1082         }
1083
1084         /*
1085          * For any present drive:
1086          * - allocate the block device queue
1087          * - link drive into the hwgroup
1088          */
1089         for (index = 0; index < MAX_DRIVES; ++index) {
1090                 ide_drive_t *drive = &hwif->drives[index];
1091                 if (!drive->present)
1092                         continue;
1093                 if (ide_init_queue(drive)) {
1094                         printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1095                         continue;
1096                 }
1097                 spin_lock_irq(&ide_lock);
1098                 if (!hwgroup->drive) {
1099                         /* first drive for hwgroup. */
1100                         drive->next = drive;
1101                         hwgroup->drive = drive;
1102                         hwgroup->hwif = HWIF(hwgroup->drive);
1103                 } else {
1104                         drive->next = hwgroup->drive->next;
1105                         hwgroup->drive->next = drive;
1106                 }
1107                 spin_unlock_irq(&ide_lock);
1108         }
1109
1110 #if !defined(__mc68000__) && !defined(CONFIG_APUS)
1111         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1112                 hwif->io_ports[IDE_DATA_OFFSET],
1113                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1114                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1115 #else
1116         printk("%s at 0x%08lx on irq %d", hwif->name,
1117                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1118 #endif /* __mc68000__ && CONFIG_APUS */
1119         if (match)
1120                 printk(" (%sed with %s)",
1121                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1122         printk("\n");
1123         mutex_unlock(&ide_cfg_mtx);
1124         return 0;
1125 out_unlink:
1126         spin_lock_irq(&ide_lock);
1127         if (hwif->next == hwif) {
1128                 BUG_ON(match);
1129                 BUG_ON(hwgroup->hwif != hwif);
1130                 kfree(hwgroup);
1131         } else {
1132                 ide_hwif_t *g;
1133                 g = hwgroup->hwif;
1134                 while (g->next != hwif)
1135                         g = g->next;
1136                 g->next = hwif->next;
1137                 if (hwgroup->hwif == hwif) {
1138                         /* Impossible. */
1139                         printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1140                         hwgroup->hwif = g;
1141                 }
1142                 BUG_ON(hwgroup->hwif == hwif);
1143         }
1144         spin_unlock_irq(&ide_lock);
1145 out_up:
1146         mutex_unlock(&ide_cfg_mtx);
1147         return 1;
1148 }
1149
1150 static int ata_lock(dev_t dev, void *data)
1151 {
1152         /* FIXME: we want to pin hwif down */
1153         return 0;
1154 }
1155
1156 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1157 {
1158         ide_hwif_t *hwif = data;
1159         int unit = *part >> PARTN_BITS;
1160         ide_drive_t *drive = &hwif->drives[unit];
1161         if (!drive->present)
1162                 return NULL;
1163
1164         if (drive->media == ide_disk)
1165                 request_module("ide-disk");
1166         if (drive->scsi)
1167                 request_module("ide-scsi");
1168         if (drive->media == ide_cdrom || drive->media == ide_optical)
1169                 request_module("ide-cd");
1170         if (drive->media == ide_tape)
1171                 request_module("ide-tape");
1172         if (drive->media == ide_floppy)
1173                 request_module("ide-floppy");
1174
1175         return NULL;
1176 }
1177
1178 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1179 {
1180         struct gendisk *p = data;
1181         *part &= (1 << PARTN_BITS) - 1;
1182         return &p->kobj;
1183 }
1184
1185 static int exact_lock(dev_t dev, void *data)
1186 {
1187         struct gendisk *p = data;
1188
1189         if (!get_disk(p))
1190                 return -1;
1191         return 0;
1192 }
1193
1194 void ide_register_region(struct gendisk *disk)
1195 {
1196         blk_register_region(MKDEV(disk->major, disk->first_minor),
1197                             disk->minors, NULL, exact_match, exact_lock, disk);
1198 }
1199
1200 EXPORT_SYMBOL_GPL(ide_register_region);
1201
1202 void ide_unregister_region(struct gendisk *disk)
1203 {
1204         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1205                               disk->minors);
1206 }
1207
1208 EXPORT_SYMBOL_GPL(ide_unregister_region);
1209
1210 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1211 {
1212         ide_hwif_t *hwif = drive->hwif;
1213         unsigned int unit = (drive->select.all >> 4) & 1;
1214
1215         disk->major = hwif->major;
1216         disk->first_minor = unit << PARTN_BITS;
1217         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1218         disk->queue = drive->queue;
1219 }
1220
1221 EXPORT_SYMBOL_GPL(ide_init_disk);
1222
1223 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1224 {
1225         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1226
1227         if (drive == drive->next) {
1228                 /* special case: last drive from hwgroup. */
1229                 BUG_ON(hwgroup->drive != drive);
1230                 hwgroup->drive = NULL;
1231         } else {
1232                 ide_drive_t *walk;
1233
1234                 walk = hwgroup->drive;
1235                 while (walk->next != drive)
1236                         walk = walk->next;
1237                 walk->next = drive->next;
1238                 if (hwgroup->drive == drive) {
1239                         hwgroup->drive = drive->next;
1240                         hwgroup->hwif = hwgroup->drive->hwif;
1241                 }
1242         }
1243         BUG_ON(hwgroup->drive == drive);
1244 }
1245
1246 static void drive_release_dev (struct device *dev)
1247 {
1248         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1249
1250         spin_lock_irq(&ide_lock);
1251         ide_remove_drive_from_hwgroup(drive);
1252         kfree(drive->id);
1253         drive->id = NULL;
1254         drive->present = 0;
1255         /* Messed up locking ... */
1256         spin_unlock_irq(&ide_lock);
1257         blk_cleanup_queue(drive->queue);
1258         spin_lock_irq(&ide_lock);
1259         drive->queue = NULL;
1260         spin_unlock_irq(&ide_lock);
1261
1262         complete(&drive->gendev_rel_comp);
1263 }
1264
1265 /*
1266  * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1267  * after probing for drives, to allocate partition tables and other data
1268  * structures needed for the routines in genhd.c.  ide_geninit() gets called
1269  * somewhat later, during the partition check.
1270  */
1271 static void init_gendisk (ide_hwif_t *hwif)
1272 {
1273         unsigned int unit;
1274
1275         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1276                 ide_drive_t * drive = &hwif->drives[unit];
1277                 ide_add_generic_settings(drive);
1278                 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1279                          hwif->index,unit);
1280                 drive->gendev.parent = &hwif->gendev;
1281                 drive->gendev.bus = &ide_bus_type;
1282                 drive->gendev.driver_data = drive;
1283                 drive->gendev.release = drive_release_dev;
1284         }
1285         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1286                         THIS_MODULE, ata_probe, ata_lock, hwif);
1287 }
1288
1289 static int hwif_init(ide_hwif_t *hwif)
1290 {
1291         int old_irq;
1292
1293         /* Return success if no device is connected */
1294         if (!hwif->present)
1295                 return 1;
1296
1297         if (!hwif->irq) {
1298                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1299                 {
1300                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1301                         return (hwif->present = 0);
1302                 }
1303         }
1304 #ifdef CONFIG_BLK_DEV_HD
1305         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1306                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1307                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1308                 return (hwif->present = 0);
1309         }
1310 #endif /* CONFIG_BLK_DEV_HD */
1311
1312         /* we set it back to 1 if all is ok below */    
1313         hwif->present = 0;
1314
1315         if (register_blkdev(hwif->major, hwif->name))
1316                 return 0;
1317
1318         if (!hwif->sg_max_nents)
1319                 hwif->sg_max_nents = PRD_ENTRIES;
1320
1321         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1322                                  GFP_KERNEL);
1323         if (!hwif->sg_table) {
1324                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1325                 goto out;
1326         }
1327
1328         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1329         
1330         if (init_irq(hwif) == 0)
1331                 goto done;
1332
1333         old_irq = hwif->irq;
1334         /*
1335          *      It failed to initialise. Find the default IRQ for 
1336          *      this port and try that.
1337          */
1338         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1339                 printk("%s: Disabled unable to get IRQ %d.\n",
1340                         hwif->name, old_irq);
1341                 goto out;
1342         }
1343         if (init_irq(hwif)) {
1344                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1345                         hwif->name, old_irq, hwif->irq);
1346                 goto out;
1347         }
1348         printk("%s: probed IRQ %d failed, using default.\n",
1349                 hwif->name, hwif->irq);
1350
1351 done:
1352         init_gendisk(hwif);
1353
1354         ide_acpi_init(hwif);
1355
1356         hwif->present = 1;      /* success */
1357         return 1;
1358
1359 out:
1360         unregister_blkdev(hwif->major, hwif->name);
1361         return 0;
1362 }
1363
1364 static void hwif_register_devices(ide_hwif_t *hwif)
1365 {
1366         unsigned int i;
1367
1368         for (i = 0; i < MAX_DRIVES; i++) {
1369                 ide_drive_t *drive = &hwif->drives[i];
1370
1371                 if (drive->present) {
1372                         int ret = device_register(&drive->gendev);
1373
1374                         if (ret < 0)
1375                                 printk(KERN_WARNING "IDE: %s: "
1376                                         "device_register error: %d\n",
1377                                         __FUNCTION__, ret);
1378                 }
1379         }
1380 }
1381
1382 int ideprobe_init (void)
1383 {
1384         unsigned int index;
1385         int probe[MAX_HWIFS];
1386
1387         memset(probe, 0, MAX_HWIFS * sizeof(int));
1388         for (index = 0; index < MAX_HWIFS; ++index)
1389                 probe[index] = !ide_hwifs[index].present;
1390
1391         for (index = 0; index < MAX_HWIFS; ++index)
1392                 if (probe[index])
1393                         probe_hwif(&ide_hwifs[index]);
1394         for (index = 0; index < MAX_HWIFS; ++index)
1395                 if (probe[index])
1396                         hwif_init(&ide_hwifs[index]);
1397         for (index = 0; index < MAX_HWIFS; ++index) {
1398                 if (probe[index]) {
1399                         ide_hwif_t *hwif = &ide_hwifs[index];
1400                         if (!hwif->present)
1401                                 continue;
1402                         if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1403                                 hwif->chipset = ide_generic;
1404                         hwif_register_devices(hwif);
1405                 }
1406         }
1407         for (index = 0; index < MAX_HWIFS; ++index)
1408                 if (probe[index])
1409                         ide_proc_register_port(&ide_hwifs[index]);
1410         return 0;
1411 }
1412
1413 EXPORT_SYMBOL_GPL(ideprobe_init);
1414
1415 int ide_device_add(u8 idx[4])
1416 {
1417         int i, rc = 0;
1418
1419         for (i = 0; i < 4; i++) {
1420                 if (idx[i] != 0xff)
1421                         rc |= probe_hwif_init(&ide_hwifs[idx[i]]);
1422         }
1423
1424         for (i = 0; i < 4; i++) {
1425                 if (idx[i] != 0xff)
1426                         ide_proc_register_port(&ide_hwifs[idx[i]]);
1427         }
1428
1429         return rc;
1430 }
1431
1432 EXPORT_SYMBOL_GPL(ide_device_add);