194ecb0049eb1ed37c3dde4c00d3a83273c1dc88
[sfrench/cifs-2.6.git] / drivers / ide / ide-probe.c
1 /*
2  *  Copyright (C) 1994-1998   Linus Torvalds & authors (see below)
3  *  Copyright (C) 2005, 2007  Bartlomiej Zolnierkiewicz
4  */
5
6 /*
7  *  Mostly written by Mark Lord <mlord@pobox.com>
8  *                and Gadi Oxman <gadio@netvision.net.il>
9  *                and Andre Hedrick <andre@linux-ide.org>
10  *
11  *  See linux/MAINTAINERS for address of current maintainer.
12  *
13  * This is the IDE probe module, as evolved from hd.c and ide.c.
14  *
15  * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
16  *       by Andrea Arcangeli
17  */
18
19 #include <linux/module.h>
20 #include <linux/types.h>
21 #include <linux/string.h>
22 #include <linux/kernel.h>
23 #include <linux/timer.h>
24 #include <linux/mm.h>
25 #include <linux/interrupt.h>
26 #include <linux/major.h>
27 #include <linux/errno.h>
28 #include <linux/genhd.h>
29 #include <linux/slab.h>
30 #include <linux/delay.h>
31 #include <linux/ide.h>
32 #include <linux/spinlock.h>
33 #include <linux/kmod.h>
34 #include <linux/pci.h>
35 #include <linux/scatterlist.h>
36
37 #include <asm/byteorder.h>
38 #include <asm/irq.h>
39 #include <asm/uaccess.h>
40 #include <asm/io.h>
41
42 /**
43  *      generic_id              -       add a generic drive id
44  *      @drive: drive to make an ID block for
45  *      
46  *      Add a fake id field to the drive we are passed. This allows
47  *      use to skip a ton of NULL checks (which people always miss) 
48  *      and make drive properties unconditional outside of this file
49  */
50  
51 static void generic_id(ide_drive_t *drive)
52 {
53         drive->id->cyls = drive->cyl;
54         drive->id->heads = drive->head;
55         drive->id->sectors = drive->sect;
56         drive->id->cur_cyls = drive->cyl;
57         drive->id->cur_heads = drive->head;
58         drive->id->cur_sectors = drive->sect;
59 }
60
61 static void ide_disk_init_chs(ide_drive_t *drive)
62 {
63         struct hd_driveid *id = drive->id;
64
65         /* Extract geometry if we did not already have one for the drive */
66         if (!drive->cyl || !drive->head || !drive->sect) {
67                 drive->cyl  = drive->bios_cyl  = id->cyls;
68                 drive->head = drive->bios_head = id->heads;
69                 drive->sect = drive->bios_sect = id->sectors;
70         }
71
72         /* Handle logical geometry translation by the drive */
73         if ((id->field_valid & 1) && id->cur_cyls &&
74             id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
75                 drive->cyl  = id->cur_cyls;
76                 drive->head = id->cur_heads;
77                 drive->sect = id->cur_sectors;
78         }
79
80         /* Use physical geometry if what we have still makes no sense */
81         if (drive->head > 16 && id->heads && id->heads <= 16) {
82                 drive->cyl  = id->cyls;
83                 drive->head = id->heads;
84                 drive->sect = id->sectors;
85         }
86 }
87
88 static void ide_disk_init_mult_count(ide_drive_t *drive)
89 {
90         struct hd_driveid *id = drive->id;
91
92         drive->mult_count = 0;
93         if (id->max_multsect) {
94 #ifdef CONFIG_IDEDISK_MULTI_MODE
95                 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
96                 id->multsect_valid = id->multsect ? 1 : 0;
97                 drive->mult_req = id->multsect_valid ? id->max_multsect : 0;
98                 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
99 #else   /* original, pre IDE-NFG, per request of AC */
100                 drive->mult_req = 0;
101                 if (drive->mult_req > id->max_multsect)
102                         drive->mult_req = id->max_multsect;
103                 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
104                         drive->special.b.set_multmode = 1;
105 #endif
106         }
107 }
108
109 /**
110  *      do_identify     -       identify a drive
111  *      @drive: drive to identify 
112  *      @cmd: command used
113  *
114  *      Called when we have issued a drive identify command to
115  *      read and parse the results. This function is run with
116  *      interrupts disabled. 
117  */
118  
119 static inline void do_identify (ide_drive_t *drive, u8 cmd)
120 {
121         ide_hwif_t *hwif = HWIF(drive);
122         int bswap = 1;
123         struct hd_driveid *id;
124
125         id = drive->id;
126         /* read 512 bytes of id info */
127         hwif->ata_input_data(drive, id, SECTOR_WORDS);
128
129         drive->id_read = 1;
130         local_irq_enable();
131 #ifdef DEBUG
132         printk(KERN_INFO "%s: dumping identify data\n", drive->name);
133         ide_dump_identify((u8 *)id);
134 #endif
135         ide_fix_driveid(id);
136
137 #if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
138         /*
139          * EATA SCSI controllers do a hardware ATA emulation:
140          * Ignore them if there is a driver for them available.
141          */
142         if ((id->model[0] == 'P' && id->model[1] == 'M') ||
143             (id->model[0] == 'S' && id->model[1] == 'K')) {
144                 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
145                 goto err_misc;
146         }
147 #endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
148
149         /*
150          *  WIN_IDENTIFY returns little-endian info,
151          *  WIN_PIDENTIFY *usually* returns little-endian info.
152          */
153         if (cmd == WIN_PIDENTIFY) {
154                 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
155                  || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
156                  || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
157                         /* Vertos drives may still be weird */
158                         bswap ^= 1;     
159         }
160         ide_fixstring(id->model,     sizeof(id->model),     bswap);
161         ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
162         ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
163
164         /* we depend on this a lot! */
165         id->model[sizeof(id->model)-1] = '\0';
166
167         if (strstr(id->model, "E X A B Y T E N E S T"))
168                 goto err_misc;
169
170         printk("%s: %s, ", drive->name, id->model);
171         drive->present = 1;
172         drive->dead = 0;
173
174         /*
175          * Check for an ATAPI device
176          */
177         if (cmd == WIN_PIDENTIFY) {
178                 u8 type = (id->config >> 8) & 0x1f;
179                 printk("ATAPI ");
180                 switch (type) {
181                         case ide_floppy:
182                                 if (!strstr(id->model, "CD-ROM")) {
183                                         if (!strstr(id->model, "oppy") &&
184                                             !strstr(id->model, "poyp") &&
185                                             !strstr(id->model, "ZIP"))
186                                                 printk("cdrom or floppy?, assuming ");
187                                         if (drive->media != ide_cdrom) {
188                                                 printk ("FLOPPY");
189                                                 drive->removable = 1;
190                                                 break;
191                                         }
192                                 }
193                                 /* Early cdrom models used zero */
194                                 type = ide_cdrom;
195                         case ide_cdrom:
196                                 drive->removable = 1;
197 #ifdef CONFIG_PPC
198                                 /* kludge for Apple PowerBook internal zip */
199                                 if (!strstr(id->model, "CD-ROM") &&
200                                     strstr(id->model, "ZIP")) {
201                                         printk ("FLOPPY");
202                                         type = ide_floppy;
203                                         break;
204                                 }
205 #endif
206                                 printk ("CD/DVD-ROM");
207                                 break;
208                         case ide_tape:
209                                 printk ("TAPE");
210                                 break;
211                         case ide_optical:
212                                 printk ("OPTICAL");
213                                 drive->removable = 1;
214                                 break;
215                         default:
216                                 printk("UNKNOWN (type %d)", type);
217                                 break;
218                 }
219                 printk (" drive\n");
220                 drive->media = type;
221                 /* an ATAPI device ignores DRDY */
222                 drive->ready_stat = 0;
223                 return;
224         }
225
226         /*
227          * Not an ATAPI device: looks like a "regular" hard disk
228          */
229
230         /*
231          * 0x848a = CompactFlash device
232          * These are *not* removable in Linux definition of the term
233          */
234
235         if ((id->config != 0x848a) && (id->config & (1<<7)))
236                 drive->removable = 1;
237
238         drive->media = ide_disk;
239         printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
240
241         return;
242
243 err_misc:
244         kfree(id);
245         drive->present = 0;
246         return;
247 }
248
249 /**
250  *      actual_try_to_identify  -       send ata/atapi identify
251  *      @drive: drive to identify
252  *      @cmd: command to use
253  *
254  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
255  *      and waits for a response.  It also monitors irqs while this is
256  *      happening, in hope of automatically determining which one is
257  *      being used by the interface.
258  *
259  *      Returns:        0  device was identified
260  *                      1  device timed-out (no response to identify request)
261  *                      2  device aborted the command (refused to identify itself)
262  */
263
264 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
265 {
266         ide_hwif_t *hwif = HWIF(drive);
267         int use_altstatus = 0, rc;
268         unsigned long timeout;
269         u8 s = 0, a = 0;
270
271         /* take a deep breath */
272         msleep(50);
273
274         if (IDE_CONTROL_REG) {
275                 a = ide_read_altstatus(drive);
276                 s = ide_read_status(drive);
277                 if ((a ^ s) & ~INDEX_STAT)
278                         /* ancient Seagate drives, broken interfaces */
279                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
280                                          "instead of ALTSTATUS(0x%02x)\n",
281                                          drive->name, s, a);
282                 else
283                         /* use non-intrusive polling */
284                         use_altstatus = 1;
285         }
286
287         /* set features register for atapi
288          * identify command to be sure of reply
289          */
290         if ((cmd == WIN_PIDENTIFY))
291                 /* disable dma & overlap */
292                 hwif->OUTB(0, IDE_FEATURE_REG);
293
294         /* ask drive for ID */
295         hwif->OUTB(cmd, IDE_COMMAND_REG);
296
297         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
298         timeout += jiffies;
299         do {
300                 if (time_after(jiffies, timeout)) {
301                         /* drive timed-out */
302                         return 1;
303                 }
304                 /* give drive a breather */
305                 msleep(50);
306                 s = use_altstatus ? ide_read_altstatus(drive)
307                                   : ide_read_status(drive);
308         } while (s & BUSY_STAT);
309
310         /* wait for IRQ and DRQ_STAT */
311         msleep(50);
312         s = ide_read_status(drive);
313
314         if (OK_STAT(s, DRQ_STAT, BAD_R_STAT)) {
315                 unsigned long flags;
316
317                 /* local CPU only; some systems need this */
318                 local_irq_save(flags);
319                 /* drive returned ID */
320                 do_identify(drive, cmd);
321                 /* drive responded with ID */
322                 rc = 0;
323                 /* clear drive IRQ */
324                 (void)ide_read_status(drive);
325                 local_irq_restore(flags);
326         } else {
327                 /* drive refused ID */
328                 rc = 2;
329         }
330         return rc;
331 }
332
333 /**
334  *      try_to_identify -       try to identify a drive
335  *      @drive: drive to probe
336  *      @cmd: command to use
337  *
338  *      Issue the identify command and then do IRQ probing to
339  *      complete the identification when needed by finding the
340  *      IRQ the drive is attached to
341  */
342  
343 static int try_to_identify (ide_drive_t *drive, u8 cmd)
344 {
345         ide_hwif_t *hwif = HWIF(drive);
346         int retval;
347         int autoprobe = 0;
348         unsigned long cookie = 0;
349
350         /*
351          * Disable device irq unless we need to
352          * probe for it. Otherwise we'll get spurious
353          * interrupts during the identify-phase that
354          * the irq handler isn't expecting.
355          */
356         if (IDE_CONTROL_REG) {
357                 if (!hwif->irq) {
358                         autoprobe = 1;
359                         cookie = probe_irq_on();
360                 }
361                 ide_set_irq(drive, autoprobe);
362         }
363
364         retval = actual_try_to_identify(drive, cmd);
365
366         if (autoprobe) {
367                 int irq;
368
369                 ide_set_irq(drive, 0);
370                 /* clear drive IRQ */
371                 (void)ide_read_status(drive);
372                 udelay(5);
373                 irq = probe_irq_off(cookie);
374                 if (!hwif->irq) {
375                         if (irq > 0) {
376                                 hwif->irq = irq;
377                         } else {
378                                 /* Mmmm.. multiple IRQs..
379                                  * don't know which was ours
380                                  */
381                                 printk("%s: IRQ probe failed (0x%lx)\n",
382                                         drive->name, cookie);
383                         }
384                 }
385         }
386         return retval;
387 }
388
389 static int ide_busy_sleep(ide_hwif_t *hwif)
390 {
391         unsigned long timeout = jiffies + WAIT_WORSTCASE;
392         u8 stat;
393
394         do {
395                 msleep(50);
396                 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
397                 if ((stat & BUSY_STAT) == 0)
398                         return 0;
399         } while (time_before(jiffies, timeout));
400
401         return 1;
402 }
403
404 /**
405  *      do_probe                -       probe an IDE device
406  *      @drive: drive to probe
407  *      @cmd: command to use
408  *
409  *      do_probe() has the difficult job of finding a drive if it exists,
410  *      without getting hung up if it doesn't exist, without trampling on
411  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
412  *
413  *      If a drive is "known" to exist (from CMOS or kernel parameters),
414  *      but does not respond right away, the probe will "hang in there"
415  *      for the maximum wait time (about 30 seconds), otherwise it will
416  *      exit much more quickly.
417  *
418  * Returns:     0  device was identified
419  *              1  device timed-out (no response to identify request)
420  *              2  device aborted the command (refused to identify itself)
421  *              3  bad status from device (possible for ATAPI drives)
422  *              4  probe was not attempted because failure was obvious
423  */
424
425 static int do_probe (ide_drive_t *drive, u8 cmd)
426 {
427         ide_hwif_t *hwif = HWIF(drive);
428         int rc;
429         u8 stat;
430
431         if (drive->present) {
432                 /* avoid waiting for inappropriate probes */
433                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
434                         return 4;
435         }
436 #ifdef DEBUG
437         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
438                 drive->name, drive->present, drive->media,
439                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
440 #endif
441
442         /* needed for some systems
443          * (e.g. crw9624 as drive0 with disk as slave)
444          */
445         msleep(50);
446         SELECT_DRIVE(drive);
447         msleep(50);
448         if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
449                 if (drive->select.b.unit != 0) {
450                         /* exit with drive0 selected */
451                         SELECT_DRIVE(&hwif->drives[0]);
452                         /* allow BUSY_STAT to assert & clear */
453                         msleep(50);
454                 }
455                 /* no i/f present: mmm.. this should be a 4 -ml */
456                 return 3;
457         }
458
459         stat = ide_read_status(drive);
460
461         if (OK_STAT(stat, READY_STAT, BUSY_STAT) ||
462             drive->present || cmd == WIN_PIDENTIFY) {
463                 /* send cmd and wait */
464                 if ((rc = try_to_identify(drive, cmd))) {
465                         /* failed: try again */
466                         rc = try_to_identify(drive,cmd);
467                 }
468
469                 stat = ide_read_status(drive);
470
471                 if (stat == (BUSY_STAT | READY_STAT))
472                         return 4;
473
474                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
475                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
476                         (drive->autotune == IDE_TUNE_AUTO))) {
477                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
478                                         "resetting drive\n", drive->name, stat);
479                         msleep(50);
480                         hwif->OUTB(drive->select.all, IDE_SELECT_REG);
481                         msleep(50);
482                         hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
483                         (void)ide_busy_sleep(hwif);
484                         rc = try_to_identify(drive, cmd);
485                 }
486
487                 /* ensure drive IRQ is clear */
488                 stat = ide_read_status(drive);
489
490                 if (rc == 1)
491                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
492                                         drive->name, stat);
493         } else {
494                 /* not present or maybe ATAPI */
495                 rc = 3;
496         }
497         if (drive->select.b.unit != 0) {
498                 /* exit with drive0 selected */
499                 SELECT_DRIVE(&hwif->drives[0]);
500                 msleep(50);
501                 /* ensure drive irq is clear */
502                 (void)ide_read_status(drive);
503         }
504         return rc;
505 }
506
507 /*
508  *
509  */
510 static void enable_nest (ide_drive_t *drive)
511 {
512         ide_hwif_t *hwif = HWIF(drive);
513         u8 stat;
514
515         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
516         SELECT_DRIVE(drive);
517         msleep(50);
518         hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
519
520         if (ide_busy_sleep(hwif)) {
521                 printk(KERN_CONT "failed (timeout)\n");
522                 return;
523         }
524
525         msleep(50);
526
527         stat = ide_read_status(drive);
528
529         if (!OK_STAT(stat, 0, BAD_STAT))
530                 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
531         else
532                 printk(KERN_CONT "success\n");
533
534         /* if !(success||timed-out) */
535         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
536                 /* look for ATAPI device */
537                 (void) do_probe(drive, WIN_PIDENTIFY);
538         }
539 }
540
541 /**
542  *      probe_for_drives        -       upper level drive probe
543  *      @drive: drive to probe for
544  *
545  *      probe_for_drive() tests for existence of a given drive using do_probe()
546  *      and presents things to the user as needed.
547  *
548  *      Returns:        0  no device was found
549  *                      1  device was found (note: drive->present might
550  *                         still be 0)
551  */
552  
553 static inline u8 probe_for_drive (ide_drive_t *drive)
554 {
555         /*
556          *      In order to keep things simple we have an id
557          *      block for all drives at all times. If the device
558          *      is pre ATA or refuses ATA/ATAPI identify we
559          *      will add faked data to this.
560          *
561          *      Also note that 0 everywhere means "can't do X"
562          */
563  
564         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
565         drive->id_read = 0;
566         if(drive->id == NULL)
567         {
568                 printk(KERN_ERR "ide: out of memory for id data.\n");
569                 return 0;
570         }
571         strcpy(drive->id->model, "UNKNOWN");
572         
573         /* skip probing? */
574         if (!drive->noprobe)
575         {
576                 /* if !(success||timed-out) */
577                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
578                         /* look for ATAPI device */
579                         (void) do_probe(drive, WIN_PIDENTIFY);
580                 }
581                 if (!drive->present)
582                         /* drive not found */
583                         return 0;
584                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
585                         enable_nest(drive);
586         
587                 /* identification failed? */
588                 if (!drive->id_read) {
589                         if (drive->media == ide_disk) {
590                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
591                                         drive->name, drive->cyl,
592                                         drive->head, drive->sect);
593                         } else if (drive->media == ide_cdrom) {
594                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
595                         } else {
596                                 /* nuke it */
597                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
598                                 drive->present = 0;
599                         }
600                 }
601                 /* drive was found */
602         }
603         if(!drive->present)
604                 return 0;
605         /* The drive wasn't being helpful. Add generic info only */
606         if (drive->id_read == 0) {
607                 generic_id(drive);
608                 return 1;
609         }
610
611         if (drive->media == ide_disk) {
612                 ide_disk_init_chs(drive);
613                 ide_disk_init_mult_count(drive);
614         }
615
616         return drive->present;
617 }
618
619 static void hwif_release_dev (struct device *dev)
620 {
621         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
622
623         complete(&hwif->gendev_rel_comp);
624 }
625
626 static void ide_register_port(ide_hwif_t *hwif)
627 {
628         int ret;
629
630         /* register with global device tree */
631         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
632         hwif->gendev.driver_data = hwif;
633         if (hwif->gendev.parent == NULL) {
634                 if (hwif->dev)
635                         hwif->gendev.parent = hwif->dev;
636                 else
637                         /* Would like to do = &device_legacy */
638                         hwif->gendev.parent = NULL;
639         }
640         hwif->gendev.release = hwif_release_dev;
641         ret = device_register(&hwif->gendev);
642         if (ret < 0)
643                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
644                         __FUNCTION__, ret);
645 }
646
647 /**
648  *      ide_port_wait_ready     -       wait for port to become ready
649  *      @hwif: IDE port
650  *
651  *      This is needed on some PPCs and a bunch of BIOS-less embedded
652  *      platforms.  Typical cases are:
653  *
654  *      - The firmware hard reset the disk before booting the kernel,
655  *        the drive is still doing it's poweron-reset sequence, that
656  *        can take up to 30 seconds.
657  *
658  *      - The firmware does nothing (or no firmware), the device is
659  *        still in POST state (same as above actually).
660  *
661  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
662  *        their reset sequence even when they are non-selected slave
663  *        devices, thus preventing discovery of the main HD.
664  *
665  *      Doing this wait-for-non-busy should not harm any existing
666  *      configuration and fix some issues like the above.
667  *
668  *      BenH.
669  *
670  *      Returns 0 on success, error code (< 0) otherwise.
671  */
672
673 static int ide_port_wait_ready(ide_hwif_t *hwif)
674 {
675         int unit, rc;
676
677         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
678
679         /* Let HW settle down a bit from whatever init state we
680          * come from */
681         mdelay(2);
682
683         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
684          * I know of at least one disk who takes 31 seconds, I use 35
685          * here to be safe
686          */
687         rc = ide_wait_not_busy(hwif, 35000);
688         if (rc)
689                 return rc;
690
691         /* Now make sure both master & slave are ready */
692         for (unit = 0; unit < MAX_DRIVES; unit++) {
693                 ide_drive_t *drive = &hwif->drives[unit];
694
695                 /* Ignore disks that we will not probe for later. */
696                 if (!drive->noprobe || drive->present) {
697                         SELECT_DRIVE(drive);
698                         ide_set_irq(drive, 1);
699                         mdelay(2);
700                         rc = ide_wait_not_busy(hwif, 35000);
701                         if (rc)
702                                 goto out;
703                 } else
704                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
705                                           drive->name);
706         }
707 out:
708         /* Exit function with master reselected (let's be sane) */
709         if (unit)
710                 SELECT_DRIVE(&hwif->drives[0]);
711
712         return rc;
713 }
714
715 /**
716  *      ide_undecoded_slave     -       look for bad CF adapters
717  *      @drive1: drive
718  *
719  *      Analyse the drives on the interface and attempt to decide if we
720  *      have the same drive viewed twice. This occurs with crap CF adapters
721  *      and PCMCIA sometimes.
722  */
723
724 void ide_undecoded_slave(ide_drive_t *drive1)
725 {
726         ide_drive_t *drive0 = &drive1->hwif->drives[0];
727
728         if ((drive1->dn & 1) == 0 || drive0->present == 0)
729                 return;
730
731         /* If the models don't match they are not the same product */
732         if (strcmp(drive0->id->model, drive1->id->model))
733                 return;
734
735         /* Serial numbers do not match */
736         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
737                 return;
738
739         /* No serial number, thankfully very rare for CF */
740         if (drive0->id->serial_no[0] == 0)
741                 return;
742
743         /* Appears to be an IDE flash adapter with decode bugs */
744         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
745
746         drive1->present = 0;
747 }
748
749 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
750
751 static int ide_probe_port(ide_hwif_t *hwif)
752 {
753         unsigned long flags;
754         unsigned int irqd;
755         int unit, rc = -ENODEV;
756
757         BUG_ON(hwif->present);
758
759         if (hwif->noprobe ||
760             (hwif->drives[0].noprobe && hwif->drives[1].noprobe))
761                 return -EACCES;
762
763         /*
764          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
765          * we'll install our IRQ driver much later...
766          */
767         irqd = hwif->irq;
768         if (irqd)
769                 disable_irq(hwif->irq);
770
771         local_irq_set(flags);
772
773         if (ide_port_wait_ready(hwif) == -EBUSY)
774                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
775
776         /*
777          * Need to probe slave device first to make it release PDIAG-.
778          */
779         for (unit = MAX_DRIVES - 1; unit >= 0; unit--) {
780                 ide_drive_t *drive = &hwif->drives[unit];
781                 drive->dn = (hwif->channel ? 2 : 0) + unit;
782                 (void) probe_for_drive(drive);
783                 if (drive->present)
784                         rc = 0;
785         }
786         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
787                 printk(KERN_WARNING "%s: reset\n", hwif->name);
788                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
789                 udelay(10);
790                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
791                 (void)ide_busy_sleep(hwif);
792         }
793         local_irq_restore(flags);
794         /*
795          * Use cached IRQ number. It might be (and is...) changed by probe
796          * code above
797          */
798         if (irqd)
799                 enable_irq(irqd);
800
801         return rc;
802 }
803
804 static void ide_port_tune_devices(ide_hwif_t *hwif)
805 {
806         int unit;
807
808         for (unit = 0; unit < MAX_DRIVES; unit++) {
809                 ide_drive_t *drive = &hwif->drives[unit];
810
811                 if (drive->present && hwif->quirkproc)
812                         hwif->quirkproc(drive);
813         }
814
815         for (unit = 0; unit < MAX_DRIVES; ++unit) {
816                 ide_drive_t *drive = &hwif->drives[unit];
817
818                 if (drive->present) {
819                         if (drive->autotune == IDE_TUNE_AUTO)
820                                 ide_set_max_pio(drive);
821
822                         if (drive->autotune != IDE_TUNE_DEFAULT &&
823                             drive->autotune != IDE_TUNE_AUTO)
824                                 continue;
825
826                         drive->nice1 = 1;
827
828                         if (hwif->dma_host_set)
829                                 ide_set_dma(drive);
830                 }
831         }
832
833         for (unit = 0; unit < MAX_DRIVES; ++unit) {
834                 ide_drive_t *drive = &hwif->drives[unit];
835
836                 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
837                         drive->no_io_32bit = 1;
838                 else
839                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
840         }
841 }
842
843 #if MAX_HWIFS > 1
844 /*
845  * save_match() is used to simplify logic in init_irq() below.
846  *
847  * A loophole here is that we may not know about a particular
848  * hwif's irq until after that hwif is actually probed/initialized..
849  * This could be a problem for the case where an hwif is on a
850  * dual interface that requires serialization (eg. cmd640) and another
851  * hwif using one of the same irqs is initialized beforehand.
852  *
853  * This routine detects and reports such situations, but does not fix them.
854  */
855 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
856 {
857         ide_hwif_t *m = *match;
858
859         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
860                 if (!new->hwgroup)
861                         return;
862                 printk("%s: potential irq problem with %s and %s\n",
863                         hwif->name, new->name, m->name);
864         }
865         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
866                 *match = new;
867 }
868 #endif /* MAX_HWIFS > 1 */
869
870 /*
871  * init request queue
872  */
873 static int ide_init_queue(ide_drive_t *drive)
874 {
875         struct request_queue *q;
876         ide_hwif_t *hwif = HWIF(drive);
877         int max_sectors = 256;
878         int max_sg_entries = PRD_ENTRIES;
879
880         /*
881          *      Our default set up assumes the normal IDE case,
882          *      that is 64K segmenting, standard PRD setup
883          *      and LBA28. Some drivers then impose their own
884          *      limits and LBA48 we could raise it but as yet
885          *      do not.
886          */
887
888         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
889         if (!q)
890                 return 1;
891
892         q->queuedata = drive;
893         blk_queue_segment_boundary(q, 0xffff);
894
895         if (hwif->rqsize < max_sectors)
896                 max_sectors = hwif->rqsize;
897         blk_queue_max_sectors(q, max_sectors);
898
899 #ifdef CONFIG_PCI
900         /* When we have an IOMMU, we may have a problem where pci_map_sg()
901          * creates segments that don't completely match our boundary
902          * requirements and thus need to be broken up again. Because it
903          * doesn't align properly either, we may actually have to break up
904          * to more segments than what was we got in the first place, a max
905          * worst case is twice as many.
906          * This will be fixed once we teach pci_map_sg() about our boundary
907          * requirements, hopefully soon. *FIXME*
908          */
909         if (!PCI_DMA_BUS_IS_PHYS)
910                 max_sg_entries >>= 1;
911 #endif /* CONFIG_PCI */
912
913         blk_queue_max_hw_segments(q, max_sg_entries);
914         blk_queue_max_phys_segments(q, max_sg_entries);
915
916         /* assign drive queue */
917         drive->queue = q;
918
919         /* needs drive->queue to be set */
920         ide_toggle_bounce(drive, 1);
921
922         return 0;
923 }
924
925 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
926 {
927         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
928
929         spin_lock_irq(&ide_lock);
930         if (!hwgroup->drive) {
931                 /* first drive for hwgroup. */
932                 drive->next = drive;
933                 hwgroup->drive = drive;
934                 hwgroup->hwif = HWIF(hwgroup->drive);
935         } else {
936                 drive->next = hwgroup->drive->next;
937                 hwgroup->drive->next = drive;
938         }
939         spin_unlock_irq(&ide_lock);
940 }
941
942 /*
943  * For any present drive:
944  * - allocate the block device queue
945  * - link drive into the hwgroup
946  */
947 static void ide_port_setup_devices(ide_hwif_t *hwif)
948 {
949         int i;
950
951         for (i = 0; i < MAX_DRIVES; i++) {
952                 ide_drive_t *drive = &hwif->drives[i];
953
954                 if (!drive->present)
955                         continue;
956
957                 if (ide_init_queue(drive)) {
958                         printk(KERN_ERR "ide: failed to init %s\n",
959                                         drive->name);
960                         continue;
961                 }
962
963                 ide_add_drive_to_hwgroup(drive);
964         }
965 }
966
967 /*
968  * This routine sets up the irq for an ide interface, and creates a new
969  * hwgroup for the irq/hwif if none was previously assigned.
970  *
971  * Much of the code is for correctly detecting/handling irq sharing
972  * and irq serialization situations.  This is somewhat complex because
973  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
974  */
975 static int init_irq (ide_hwif_t *hwif)
976 {
977         unsigned int index;
978         ide_hwgroup_t *hwgroup;
979         ide_hwif_t *match = NULL;
980
981
982         BUG_ON(in_interrupt());
983         BUG_ON(irqs_disabled());        
984         BUG_ON(hwif == NULL);
985
986         mutex_lock(&ide_cfg_mtx);
987         hwif->hwgroup = NULL;
988 #if MAX_HWIFS > 1
989         /*
990          * Group up with any other hwifs that share our irq(s).
991          */
992         for (index = 0; index < MAX_HWIFS; index++) {
993                 ide_hwif_t *h = &ide_hwifs[index];
994                 if (h->hwgroup) {  /* scan only initialized hwif's */
995                         if (hwif->irq == h->irq) {
996                                 hwif->sharing_irq = h->sharing_irq = 1;
997                                 if (hwif->chipset != ide_pci ||
998                                     h->chipset != ide_pci) {
999                                         save_match(hwif, h, &match);
1000                                 }
1001                         }
1002                         if (hwif->serialized) {
1003                                 if (hwif->mate && hwif->mate->irq == h->irq)
1004                                         save_match(hwif, h, &match);
1005                         }
1006                         if (h->serialized) {
1007                                 if (h->mate && hwif->irq == h->mate->irq)
1008                                         save_match(hwif, h, &match);
1009                         }
1010                 }
1011         }
1012 #endif /* MAX_HWIFS > 1 */
1013         /*
1014          * If we are still without a hwgroup, then form a new one
1015          */
1016         if (match) {
1017                 hwgroup = match->hwgroup;
1018                 hwif->hwgroup = hwgroup;
1019                 /*
1020                  * Link us into the hwgroup.
1021                  * This must be done early, do ensure that unexpected_intr
1022                  * can find the hwif and prevent irq storms.
1023                  * No drives are attached to the new hwif, choose_drive
1024                  * can't do anything stupid (yet).
1025                  * Add ourself as the 2nd entry to the hwgroup->hwif
1026                  * linked list, the first entry is the hwif that owns
1027                  * hwgroup->handler - do not change that.
1028                  */
1029                 spin_lock_irq(&ide_lock);
1030                 hwif->next = hwgroup->hwif->next;
1031                 hwgroup->hwif->next = hwif;
1032                 BUG_ON(hwif->next == hwif);
1033                 spin_unlock_irq(&ide_lock);
1034         } else {
1035                 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1036                                        hwif_to_node(hwif));
1037                 if (hwgroup == NULL)
1038                         goto out_up;
1039
1040                 hwif->hwgroup = hwgroup;
1041                 hwgroup->hwif = hwif->next = hwif;
1042
1043                 init_timer(&hwgroup->timer);
1044                 hwgroup->timer.function = &ide_timer_expiry;
1045                 hwgroup->timer.data = (unsigned long) hwgroup;
1046         }
1047
1048         /*
1049          * Allocate the irq, if not already obtained for another hwif
1050          */
1051         if (!match || match->irq != hwif->irq) {
1052                 int sa = 0;
1053 #if defined(__mc68000__)
1054                 sa = IRQF_SHARED;
1055 #endif /* __mc68000__ */
1056
1057                 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1058                         sa = IRQF_SHARED;
1059
1060                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1061                         /* clear nIEN */
1062                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1063
1064                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1065                         goto out_unlink;
1066         }
1067
1068         if (!hwif->rqsize) {
1069                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1070                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1071                         hwif->rqsize = 256;
1072                 else
1073                         hwif->rqsize = 65536;
1074         }
1075
1076 #if !defined(__mc68000__)
1077         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1078                 hwif->io_ports[IDE_DATA_OFFSET],
1079                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1080                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1081 #else
1082         printk("%s at 0x%08lx on irq %d", hwif->name,
1083                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1084 #endif /* __mc68000__ */
1085         if (match)
1086                 printk(" (%sed with %s)",
1087                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1088         printk("\n");
1089
1090         ide_port_setup_devices(hwif);
1091
1092         mutex_unlock(&ide_cfg_mtx);
1093         return 0;
1094 out_unlink:
1095         ide_remove_port_from_hwgroup(hwif);
1096 out_up:
1097         mutex_unlock(&ide_cfg_mtx);
1098         return 1;
1099 }
1100
1101 static int ata_lock(dev_t dev, void *data)
1102 {
1103         /* FIXME: we want to pin hwif down */
1104         return 0;
1105 }
1106
1107 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1108 {
1109         ide_hwif_t *hwif = data;
1110         int unit = *part >> PARTN_BITS;
1111         ide_drive_t *drive = &hwif->drives[unit];
1112         if (!drive->present)
1113                 return NULL;
1114
1115         if (drive->media == ide_disk)
1116                 request_module("ide-disk");
1117         if (drive->scsi)
1118                 request_module("ide-scsi");
1119         if (drive->media == ide_cdrom || drive->media == ide_optical)
1120                 request_module("ide-cd");
1121         if (drive->media == ide_tape)
1122                 request_module("ide-tape");
1123         if (drive->media == ide_floppy)
1124                 request_module("ide-floppy");
1125
1126         return NULL;
1127 }
1128
1129 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1130 {
1131         struct gendisk *p = data;
1132         *part &= (1 << PARTN_BITS) - 1;
1133         return &p->dev.kobj;
1134 }
1135
1136 static int exact_lock(dev_t dev, void *data)
1137 {
1138         struct gendisk *p = data;
1139
1140         if (!get_disk(p))
1141                 return -1;
1142         return 0;
1143 }
1144
1145 void ide_register_region(struct gendisk *disk)
1146 {
1147         blk_register_region(MKDEV(disk->major, disk->first_minor),
1148                             disk->minors, NULL, exact_match, exact_lock, disk);
1149 }
1150
1151 EXPORT_SYMBOL_GPL(ide_register_region);
1152
1153 void ide_unregister_region(struct gendisk *disk)
1154 {
1155         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1156                               disk->minors);
1157 }
1158
1159 EXPORT_SYMBOL_GPL(ide_unregister_region);
1160
1161 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1162 {
1163         ide_hwif_t *hwif = drive->hwif;
1164         unsigned int unit = (drive->select.all >> 4) & 1;
1165
1166         disk->major = hwif->major;
1167         disk->first_minor = unit << PARTN_BITS;
1168         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1169         disk->queue = drive->queue;
1170 }
1171
1172 EXPORT_SYMBOL_GPL(ide_init_disk);
1173
1174 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1175 {
1176         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1177
1178         if (drive == drive->next) {
1179                 /* special case: last drive from hwgroup. */
1180                 BUG_ON(hwgroup->drive != drive);
1181                 hwgroup->drive = NULL;
1182         } else {
1183                 ide_drive_t *walk;
1184
1185                 walk = hwgroup->drive;
1186                 while (walk->next != drive)
1187                         walk = walk->next;
1188                 walk->next = drive->next;
1189                 if (hwgroup->drive == drive) {
1190                         hwgroup->drive = drive->next;
1191                         hwgroup->hwif = hwgroup->drive->hwif;
1192                 }
1193         }
1194         BUG_ON(hwgroup->drive == drive);
1195 }
1196
1197 static void drive_release_dev (struct device *dev)
1198 {
1199         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1200
1201         spin_lock_irq(&ide_lock);
1202         ide_remove_drive_from_hwgroup(drive);
1203         kfree(drive->id);
1204         drive->id = NULL;
1205         drive->present = 0;
1206         /* Messed up locking ... */
1207         spin_unlock_irq(&ide_lock);
1208         blk_cleanup_queue(drive->queue);
1209         spin_lock_irq(&ide_lock);
1210         drive->queue = NULL;
1211         spin_unlock_irq(&ide_lock);
1212
1213         complete(&drive->gendev_rel_comp);
1214 }
1215
1216 static int hwif_init(ide_hwif_t *hwif)
1217 {
1218         int old_irq;
1219
1220         if (!hwif->irq) {
1221                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1222                 {
1223                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1224                         return 0;
1225                 }
1226         }
1227 #ifdef CONFIG_BLK_DEV_HD
1228         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1229                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1230                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1231                 return 0;
1232         }
1233 #endif /* CONFIG_BLK_DEV_HD */
1234
1235         if (register_blkdev(hwif->major, hwif->name))
1236                 return 0;
1237
1238         if (!hwif->sg_max_nents)
1239                 hwif->sg_max_nents = PRD_ENTRIES;
1240
1241         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1242                                  GFP_KERNEL);
1243         if (!hwif->sg_table) {
1244                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1245                 goto out;
1246         }
1247
1248         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1249         
1250         if (init_irq(hwif) == 0)
1251                 goto done;
1252
1253         old_irq = hwif->irq;
1254         /*
1255          *      It failed to initialise. Find the default IRQ for 
1256          *      this port and try that.
1257          */
1258         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1259                 printk("%s: Disabled unable to get IRQ %d.\n",
1260                         hwif->name, old_irq);
1261                 goto out;
1262         }
1263         if (init_irq(hwif)) {
1264                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1265                         hwif->name, old_irq, hwif->irq);
1266                 goto out;
1267         }
1268         printk("%s: probed IRQ %d failed, using default.\n",
1269                 hwif->name, hwif->irq);
1270
1271 done:
1272         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1273                             THIS_MODULE, ata_probe, ata_lock, hwif);
1274         return 1;
1275
1276 out:
1277         unregister_blkdev(hwif->major, hwif->name);
1278         return 0;
1279 }
1280
1281 static void hwif_register_devices(ide_hwif_t *hwif)
1282 {
1283         unsigned int i;
1284
1285         for (i = 0; i < MAX_DRIVES; i++) {
1286                 ide_drive_t *drive = &hwif->drives[i];
1287                 struct device *dev = &drive->gendev;
1288                 int ret;
1289
1290                 if (!drive->present)
1291                         continue;
1292
1293                 ide_add_generic_settings(drive);
1294
1295                 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1296                 dev->parent = &hwif->gendev;
1297                 dev->bus = &ide_bus_type;
1298                 dev->driver_data = drive;
1299                 dev->release = drive_release_dev;
1300
1301                 ret = device_register(dev);
1302                 if (ret < 0)
1303                         printk(KERN_WARNING "IDE: %s: device_register error: "
1304                                             "%d\n", __func__, ret);
1305         }
1306 }
1307
1308 static void ide_port_init_devices(ide_hwif_t *hwif)
1309 {
1310         int i;
1311
1312         for (i = 0; i < MAX_DRIVES; i++) {
1313                 ide_drive_t *drive = &hwif->drives[i];
1314
1315                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1316                         drive->io_32bit = 1;
1317                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1318                         drive->unmask = 1;
1319                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1320                         drive->no_unmask = 1;
1321                 if ((hwif->host_flags & IDE_HFLAG_NO_AUTOTUNE) == 0)
1322                         drive->autotune = 1;
1323         }
1324
1325         if (hwif->port_init_devs)
1326                 hwif->port_init_devs(hwif);
1327 }
1328
1329 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1330                           const struct ide_port_info *d)
1331 {
1332         if (d->chipset != ide_etrax100)
1333                 hwif->channel = port;
1334
1335         if (d->chipset)
1336                 hwif->chipset = d->chipset;
1337
1338         if (d->init_iops)
1339                 d->init_iops(hwif);
1340
1341         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0)
1342                 ide_hwif_setup_dma(hwif, d);
1343
1344         if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1345             (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1346                 hwif->irq = port ? 15 : 14;
1347
1348         hwif->host_flags = d->host_flags;
1349         hwif->pio_mask = d->pio_mask;
1350
1351         if ((d->host_flags & IDE_HFLAG_SERIALIZE) && hwif->mate)
1352                 hwif->mate->serialized = hwif->serialized = 1;
1353
1354         hwif->swdma_mask = d->swdma_mask;
1355         hwif->mwdma_mask = d->mwdma_mask;
1356         hwif->ultra_mask = d->udma_mask;
1357
1358         /* reset DMA masks only for SFF-style DMA controllers */
1359         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0 && hwif->dma_base == 0)
1360                 hwif->swdma_mask = hwif->mwdma_mask = hwif->ultra_mask = 0;
1361
1362         if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1363                 hwif->rqsize = 256;
1364
1365         /* call chipset specific routine for each enabled port */
1366         if (d->init_hwif)
1367                 d->init_hwif(hwif);
1368
1369         if (hwif->cable_detect && (hwif->ultra_mask & 0x78)) {
1370                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1371                         hwif->cbl = hwif->cable_detect(hwif);
1372         }
1373 }
1374
1375 int ide_device_add_all(u8 *idx, const struct ide_port_info *d)
1376 {
1377         ide_hwif_t *hwif, *mate = NULL;
1378         int i, rc = 0;
1379
1380         for (i = 0; i < MAX_HWIFS; i++) {
1381                 if (d == NULL || idx[i] == 0xff) {
1382                         mate = NULL;
1383                         continue;
1384                 }
1385
1386                 hwif = &ide_hwifs[idx[i]];
1387
1388                 if (d->chipset != ide_etrax100 && (i & 1) && mate) {
1389                         hwif->mate = mate;
1390                         mate->mate = hwif;
1391                 }
1392
1393                 mate = (i & 1) ? NULL : hwif;
1394
1395                 ide_init_port(hwif, i & 1, d);
1396                 ide_port_init_devices(hwif);
1397         }
1398
1399         for (i = 0; i < MAX_HWIFS; i++) {
1400                 if (idx[i] == 0xff)
1401                         continue;
1402
1403                 hwif = &ide_hwifs[idx[i]];
1404
1405                 if ((hwif->chipset != ide_4drives || !hwif->mate ||
1406                      !hwif->mate->present) && ide_hwif_request_regions(hwif)) {
1407                         printk(KERN_ERR "%s: ports already in use, "
1408                                         "skipping probe\n", hwif->name);
1409                         continue;
1410                 }
1411
1412                 if (ide_probe_port(hwif) < 0) {
1413                         ide_hwif_release_regions(hwif);
1414                         continue;
1415                 }
1416
1417                 hwif->present = 1;
1418
1419                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1420                     !hwif->mate->present)
1421                         ide_register_port(hwif);
1422
1423                 ide_port_tune_devices(hwif);
1424         }
1425
1426         for (i = 0; i < MAX_HWIFS; i++) {
1427                 if (idx[i] == 0xff)
1428                         continue;
1429
1430                 hwif = &ide_hwifs[idx[i]];
1431
1432                 if (!hwif->present)
1433                         continue;
1434
1435                 if (hwif_init(hwif) == 0) {
1436                         printk(KERN_INFO "%s: failed to initialize IDE "
1437                                          "interface\n", hwif->name);
1438                         hwif->present = 0;
1439                         rc = -1;
1440                         continue;
1441                 }
1442
1443                 ide_acpi_init(hwif);
1444                 ide_acpi_port_init_devices(hwif);
1445         }
1446
1447         for (i = 0; i < MAX_HWIFS; i++) {
1448                 if (idx[i] == 0xff)
1449                         continue;
1450
1451                 hwif = &ide_hwifs[idx[i]];
1452
1453                 if (hwif->present) {
1454                         if (hwif->chipset == ide_unknown ||
1455                             hwif->chipset == ide_forced)
1456                                 hwif->chipset = ide_generic;
1457                         hwif_register_devices(hwif);
1458                 }
1459         }
1460
1461         for (i = 0; i < MAX_HWIFS; i++) {
1462                 if (idx[i] == 0xff)
1463                         continue;
1464
1465                 hwif = &ide_hwifs[idx[i]];
1466
1467                 if (hwif->present) {
1468                         ide_proc_register_port(hwif);
1469                         ide_proc_port_register_devices(hwif);
1470                 }
1471         }
1472
1473         return rc;
1474 }
1475 EXPORT_SYMBOL_GPL(ide_device_add_all);
1476
1477 int ide_device_add(u8 idx[4], const struct ide_port_info *d)
1478 {
1479         u8 idx_all[MAX_HWIFS];
1480         int i;
1481
1482         for (i = 0; i < MAX_HWIFS; i++)
1483                 idx_all[i] = (i < 4) ? idx[i] : 0xff;
1484
1485         return ide_device_add_all(idx_all, d);
1486 }
1487 EXPORT_SYMBOL_GPL(ide_device_add);