4a33100a2314bf6eb77f646f2129c6d2bca75377
[linux-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 (hwif->io_ports[IDE_CONTROL_OFFSET]) {
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, hwif->io_ports[IDE_FEATURE_OFFSET]);
293
294         /* ask drive for ID */
295         hwif->OUTB(cmd, hwif->io_ports[IDE_COMMAND_OFFSET]);
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 (hwif->io_ports[IDE_CONTROL_OFFSET]) {
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(hwif->io_ports[IDE_SELECT_OFFSET]) != drive->select.all &&
449             !drive->present) {
450                 if (drive->select.b.unit != 0) {
451                         /* exit with drive0 selected */
452                         SELECT_DRIVE(&hwif->drives[0]);
453                         /* allow BUSY_STAT to assert & clear */
454                         msleep(50);
455                 }
456                 /* no i/f present: mmm.. this should be a 4 -ml */
457                 return 3;
458         }
459
460         stat = ide_read_status(drive);
461
462         if (OK_STAT(stat, READY_STAT, BUSY_STAT) ||
463             drive->present || cmd == WIN_PIDENTIFY) {
464                 /* send cmd and wait */
465                 if ((rc = try_to_identify(drive, cmd))) {
466                         /* failed: try again */
467                         rc = try_to_identify(drive,cmd);
468                 }
469
470                 stat = ide_read_status(drive);
471
472                 if (stat == (BUSY_STAT | READY_STAT))
473                         return 4;
474
475                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
476                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
477                         (drive->autotune == IDE_TUNE_AUTO))) {
478                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
479                                         "resetting drive\n", drive->name, stat);
480                         msleep(50);
481                         hwif->OUTB(drive->select.all,
482                                    hwif->io_ports[IDE_SELECT_OFFSET]);
483                         msleep(50);
484                         hwif->OUTB(WIN_SRST,
485                                    hwif->io_ports[IDE_COMMAND_OFFSET]);
486                         (void)ide_busy_sleep(hwif);
487                         rc = try_to_identify(drive, cmd);
488                 }
489
490                 /* ensure drive IRQ is clear */
491                 stat = ide_read_status(drive);
492
493                 if (rc == 1)
494                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
495                                         drive->name, stat);
496         } else {
497                 /* not present or maybe ATAPI */
498                 rc = 3;
499         }
500         if (drive->select.b.unit != 0) {
501                 /* exit with drive0 selected */
502                 SELECT_DRIVE(&hwif->drives[0]);
503                 msleep(50);
504                 /* ensure drive irq is clear */
505                 (void)ide_read_status(drive);
506         }
507         return rc;
508 }
509
510 /*
511  *
512  */
513 static void enable_nest (ide_drive_t *drive)
514 {
515         ide_hwif_t *hwif = HWIF(drive);
516         u8 stat;
517
518         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
519         SELECT_DRIVE(drive);
520         msleep(50);
521         hwif->OUTB(EXABYTE_ENABLE_NEST, hwif->io_ports[IDE_COMMAND_OFFSET]);
522
523         if (ide_busy_sleep(hwif)) {
524                 printk(KERN_CONT "failed (timeout)\n");
525                 return;
526         }
527
528         msleep(50);
529
530         stat = ide_read_status(drive);
531
532         if (!OK_STAT(stat, 0, BAD_STAT))
533                 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
534         else
535                 printk(KERN_CONT "success\n");
536
537         /* if !(success||timed-out) */
538         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
539                 /* look for ATAPI device */
540                 (void) do_probe(drive, WIN_PIDENTIFY);
541         }
542 }
543
544 /**
545  *      probe_for_drives        -       upper level drive probe
546  *      @drive: drive to probe for
547  *
548  *      probe_for_drive() tests for existence of a given drive using do_probe()
549  *      and presents things to the user as needed.
550  *
551  *      Returns:        0  no device was found
552  *                      1  device was found (note: drive->present might
553  *                         still be 0)
554  */
555  
556 static inline u8 probe_for_drive (ide_drive_t *drive)
557 {
558         /*
559          *      In order to keep things simple we have an id
560          *      block for all drives at all times. If the device
561          *      is pre ATA or refuses ATA/ATAPI identify we
562          *      will add faked data to this.
563          *
564          *      Also note that 0 everywhere means "can't do X"
565          */
566  
567         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
568         drive->id_read = 0;
569         if(drive->id == NULL)
570         {
571                 printk(KERN_ERR "ide: out of memory for id data.\n");
572                 return 0;
573         }
574         strcpy(drive->id->model, "UNKNOWN");
575         
576         /* skip probing? */
577         if (!drive->noprobe)
578         {
579                 /* if !(success||timed-out) */
580                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
581                         /* look for ATAPI device */
582                         (void) do_probe(drive, WIN_PIDENTIFY);
583                 }
584                 if (!drive->present)
585                         /* drive not found */
586                         return 0;
587                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
588                         enable_nest(drive);
589         
590                 /* identification failed? */
591                 if (!drive->id_read) {
592                         if (drive->media == ide_disk) {
593                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
594                                         drive->name, drive->cyl,
595                                         drive->head, drive->sect);
596                         } else if (drive->media == ide_cdrom) {
597                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
598                         } else {
599                                 /* nuke it */
600                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
601                                 drive->present = 0;
602                         }
603                 }
604                 /* drive was found */
605         }
606         if(!drive->present)
607                 return 0;
608         /* The drive wasn't being helpful. Add generic info only */
609         if (drive->id_read == 0) {
610                 generic_id(drive);
611                 return 1;
612         }
613
614         if (drive->media == ide_disk) {
615                 ide_disk_init_chs(drive);
616                 ide_disk_init_mult_count(drive);
617         }
618
619         return drive->present;
620 }
621
622 static void hwif_release_dev (struct device *dev)
623 {
624         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
625
626         complete(&hwif->gendev_rel_comp);
627 }
628
629 static int ide_register_port(ide_hwif_t *hwif)
630 {
631         int ret;
632
633         /* register with global device tree */
634         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
635         hwif->gendev.driver_data = hwif;
636         if (hwif->gendev.parent == NULL) {
637                 if (hwif->dev)
638                         hwif->gendev.parent = hwif->dev;
639                 else
640                         /* Would like to do = &device_legacy */
641                         hwif->gendev.parent = NULL;
642         }
643         hwif->gendev.release = hwif_release_dev;
644         ret = device_register(&hwif->gendev);
645         if (ret < 0) {
646                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
647                         __func__, ret);
648                 goto out;
649         }
650
651         get_device(&hwif->gendev);
652
653         hwif->portdev = device_create(ide_port_class, &hwif->gendev,
654                                       MKDEV(0, 0), hwif->name);
655         if (IS_ERR(hwif->portdev)) {
656                 ret = PTR_ERR(hwif->portdev);
657                 device_unregister(&hwif->gendev);
658         }
659         dev_set_drvdata(hwif->portdev, hwif);
660 out:
661         return ret;
662 }
663
664 /**
665  *      ide_port_wait_ready     -       wait for port to become ready
666  *      @hwif: IDE port
667  *
668  *      This is needed on some PPCs and a bunch of BIOS-less embedded
669  *      platforms.  Typical cases are:
670  *
671  *      - The firmware hard reset the disk before booting the kernel,
672  *        the drive is still doing it's poweron-reset sequence, that
673  *        can take up to 30 seconds.
674  *
675  *      - The firmware does nothing (or no firmware), the device is
676  *        still in POST state (same as above actually).
677  *
678  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
679  *        their reset sequence even when they are non-selected slave
680  *        devices, thus preventing discovery of the main HD.
681  *
682  *      Doing this wait-for-non-busy should not harm any existing
683  *      configuration and fix some issues like the above.
684  *
685  *      BenH.
686  *
687  *      Returns 0 on success, error code (< 0) otherwise.
688  */
689
690 static int ide_port_wait_ready(ide_hwif_t *hwif)
691 {
692         int unit, rc;
693
694         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
695
696         /* Let HW settle down a bit from whatever init state we
697          * come from */
698         mdelay(2);
699
700         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
701          * I know of at least one disk who takes 31 seconds, I use 35
702          * here to be safe
703          */
704         rc = ide_wait_not_busy(hwif, 35000);
705         if (rc)
706                 return rc;
707
708         /* Now make sure both master & slave are ready */
709         for (unit = 0; unit < MAX_DRIVES; unit++) {
710                 ide_drive_t *drive = &hwif->drives[unit];
711
712                 /* Ignore disks that we will not probe for later. */
713                 if (!drive->noprobe || drive->present) {
714                         SELECT_DRIVE(drive);
715                         ide_set_irq(drive, 1);
716                         mdelay(2);
717                         rc = ide_wait_not_busy(hwif, 35000);
718                         if (rc)
719                                 goto out;
720                 } else
721                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
722                                           drive->name);
723         }
724 out:
725         /* Exit function with master reselected (let's be sane) */
726         if (unit)
727                 SELECT_DRIVE(&hwif->drives[0]);
728
729         return rc;
730 }
731
732 /**
733  *      ide_undecoded_slave     -       look for bad CF adapters
734  *      @drive1: drive
735  *
736  *      Analyse the drives on the interface and attempt to decide if we
737  *      have the same drive viewed twice. This occurs with crap CF adapters
738  *      and PCMCIA sometimes.
739  */
740
741 void ide_undecoded_slave(ide_drive_t *drive1)
742 {
743         ide_drive_t *drive0 = &drive1->hwif->drives[0];
744
745         if ((drive1->dn & 1) == 0 || drive0->present == 0)
746                 return;
747
748         /* If the models don't match they are not the same product */
749         if (strcmp(drive0->id->model, drive1->id->model))
750                 return;
751
752         /* Serial numbers do not match */
753         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
754                 return;
755
756         /* No serial number, thankfully very rare for CF */
757         if (drive0->id->serial_no[0] == 0)
758                 return;
759
760         /* Appears to be an IDE flash adapter with decode bugs */
761         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
762
763         drive1->present = 0;
764 }
765
766 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
767
768 static int ide_probe_port(ide_hwif_t *hwif)
769 {
770         unsigned long flags;
771         unsigned int irqd;
772         int unit, rc = -ENODEV;
773
774         BUG_ON(hwif->present);
775
776         if (hwif->drives[0].noprobe && hwif->drives[1].noprobe)
777                 return -EACCES;
778
779         /*
780          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
781          * we'll install our IRQ driver much later...
782          */
783         irqd = hwif->irq;
784         if (irqd)
785                 disable_irq(hwif->irq);
786
787         local_irq_set(flags);
788
789         if (ide_port_wait_ready(hwif) == -EBUSY)
790                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
791
792         /*
793          * Second drive should only exist if first drive was found,
794          * but a lot of cdrom drives are configured as single slaves.
795          */
796         for (unit = 0; unit < MAX_DRIVES; ++unit) {
797                 ide_drive_t *drive = &hwif->drives[unit];
798                 drive->dn = (hwif->channel ? 2 : 0) + unit;
799                 (void) probe_for_drive(drive);
800                 if (drive->present)
801                         rc = 0;
802         }
803         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
804                 printk(KERN_WARNING "%s: reset\n", hwif->name);
805                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
806                 udelay(10);
807                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
808                 (void)ide_busy_sleep(hwif);
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         return rc;
819 }
820
821 static void ide_port_tune_devices(ide_hwif_t *hwif)
822 {
823         const struct ide_port_ops *port_ops = hwif->port_ops;
824         int unit;
825
826         for (unit = 0; unit < MAX_DRIVES; unit++) {
827                 ide_drive_t *drive = &hwif->drives[unit];
828
829                 if (drive->present && port_ops && port_ops->quirkproc)
830                         port_ops->quirkproc(drive);
831         }
832
833         for (unit = 0; unit < MAX_DRIVES; ++unit) {
834                 ide_drive_t *drive = &hwif->drives[unit];
835
836                 if (drive->present) {
837                         if (drive->autotune == IDE_TUNE_AUTO)
838                                 ide_set_max_pio(drive);
839
840                         if (drive->autotune != IDE_TUNE_DEFAULT &&
841                             drive->autotune != IDE_TUNE_AUTO)
842                                 continue;
843
844                         drive->nice1 = 1;
845
846                         if (hwif->dma_ops)
847                                 ide_set_dma(drive);
848                 }
849         }
850
851         for (unit = 0; unit < MAX_DRIVES; ++unit) {
852                 ide_drive_t *drive = &hwif->drives[unit];
853
854                 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
855                         drive->no_io_32bit = 1;
856                 else
857                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
858         }
859 }
860
861 #if MAX_HWIFS > 1
862 /*
863  * save_match() is used to simplify logic in init_irq() below.
864  *
865  * A loophole here is that we may not know about a particular
866  * hwif's irq until after that hwif is actually probed/initialized..
867  * This could be a problem for the case where an hwif is on a
868  * dual interface that requires serialization (eg. cmd640) and another
869  * hwif using one of the same irqs is initialized beforehand.
870  *
871  * This routine detects and reports such situations, but does not fix them.
872  */
873 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
874 {
875         ide_hwif_t *m = *match;
876
877         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
878                 if (!new->hwgroup)
879                         return;
880                 printk("%s: potential irq problem with %s and %s\n",
881                         hwif->name, new->name, m->name);
882         }
883         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
884                 *match = new;
885 }
886 #endif /* MAX_HWIFS > 1 */
887
888 /*
889  * init request queue
890  */
891 static int ide_init_queue(ide_drive_t *drive)
892 {
893         struct request_queue *q;
894         ide_hwif_t *hwif = HWIF(drive);
895         int max_sectors = 256;
896         int max_sg_entries = PRD_ENTRIES;
897
898         /*
899          *      Our default set up assumes the normal IDE case,
900          *      that is 64K segmenting, standard PRD setup
901          *      and LBA28. Some drivers then impose their own
902          *      limits and LBA48 we could raise it but as yet
903          *      do not.
904          */
905
906         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
907         if (!q)
908                 return 1;
909
910         q->queuedata = drive;
911         blk_queue_segment_boundary(q, 0xffff);
912
913         if (hwif->rqsize < max_sectors)
914                 max_sectors = hwif->rqsize;
915         blk_queue_max_sectors(q, max_sectors);
916
917 #ifdef CONFIG_PCI
918         /* When we have an IOMMU, we may have a problem where pci_map_sg()
919          * creates segments that don't completely match our boundary
920          * requirements and thus need to be broken up again. Because it
921          * doesn't align properly either, we may actually have to break up
922          * to more segments than what was we got in the first place, a max
923          * worst case is twice as many.
924          * This will be fixed once we teach pci_map_sg() about our boundary
925          * requirements, hopefully soon. *FIXME*
926          */
927         if (!PCI_DMA_BUS_IS_PHYS)
928                 max_sg_entries >>= 1;
929 #endif /* CONFIG_PCI */
930
931         blk_queue_max_hw_segments(q, max_sg_entries);
932         blk_queue_max_phys_segments(q, max_sg_entries);
933
934         /* assign drive queue */
935         drive->queue = q;
936
937         /* needs drive->queue to be set */
938         ide_toggle_bounce(drive, 1);
939
940         return 0;
941 }
942
943 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
944 {
945         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
946
947         spin_lock_irq(&ide_lock);
948         if (!hwgroup->drive) {
949                 /* first drive for hwgroup. */
950                 drive->next = drive;
951                 hwgroup->drive = drive;
952                 hwgroup->hwif = HWIF(hwgroup->drive);
953         } else {
954                 drive->next = hwgroup->drive->next;
955                 hwgroup->drive->next = drive;
956         }
957         spin_unlock_irq(&ide_lock);
958 }
959
960 /*
961  * For any present drive:
962  * - allocate the block device queue
963  * - link drive into the hwgroup
964  */
965 static void ide_port_setup_devices(ide_hwif_t *hwif)
966 {
967         int i;
968
969         mutex_lock(&ide_cfg_mtx);
970         for (i = 0; i < MAX_DRIVES; i++) {
971                 ide_drive_t *drive = &hwif->drives[i];
972
973                 if (!drive->present)
974                         continue;
975
976                 if (ide_init_queue(drive)) {
977                         printk(KERN_ERR "ide: failed to init %s\n",
978                                         drive->name);
979                         continue;
980                 }
981
982                 ide_add_drive_to_hwgroup(drive);
983         }
984         mutex_unlock(&ide_cfg_mtx);
985 }
986
987 /*
988  * This routine sets up the irq for an ide interface, and creates a new
989  * hwgroup for the irq/hwif if none was previously assigned.
990  *
991  * Much of the code is for correctly detecting/handling irq sharing
992  * and irq serialization situations.  This is somewhat complex because
993  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
994  */
995 static int init_irq (ide_hwif_t *hwif)
996 {
997         unsigned int index;
998         ide_hwgroup_t *hwgroup;
999         ide_hwif_t *match = NULL;
1000
1001
1002         BUG_ON(in_interrupt());
1003         BUG_ON(irqs_disabled());        
1004         BUG_ON(hwif == NULL);
1005
1006         mutex_lock(&ide_cfg_mtx);
1007         hwif->hwgroup = NULL;
1008 #if MAX_HWIFS > 1
1009         /*
1010          * Group up with any other hwifs that share our irq(s).
1011          */
1012         for (index = 0; index < MAX_HWIFS; index++) {
1013                 ide_hwif_t *h = &ide_hwifs[index];
1014                 if (h->hwgroup) {  /* scan only initialized hwif's */
1015                         if (hwif->irq == h->irq) {
1016                                 hwif->sharing_irq = h->sharing_irq = 1;
1017                                 if (hwif->chipset != ide_pci ||
1018                                     h->chipset != ide_pci) {
1019                                         save_match(hwif, h, &match);
1020                                 }
1021                         }
1022                         if (hwif->serialized) {
1023                                 if (hwif->mate && hwif->mate->irq == h->irq)
1024                                         save_match(hwif, h, &match);
1025                         }
1026                         if (h->serialized) {
1027                                 if (h->mate && hwif->irq == h->mate->irq)
1028                                         save_match(hwif, h, &match);
1029                         }
1030                 }
1031         }
1032 #endif /* MAX_HWIFS > 1 */
1033         /*
1034          * If we are still without a hwgroup, then form a new one
1035          */
1036         if (match) {
1037                 hwgroup = match->hwgroup;
1038                 hwif->hwgroup = hwgroup;
1039                 /*
1040                  * Link us into the hwgroup.
1041                  * This must be done early, do ensure that unexpected_intr
1042                  * can find the hwif and prevent irq storms.
1043                  * No drives are attached to the new hwif, choose_drive
1044                  * can't do anything stupid (yet).
1045                  * Add ourself as the 2nd entry to the hwgroup->hwif
1046                  * linked list, the first entry is the hwif that owns
1047                  * hwgroup->handler - do not change that.
1048                  */
1049                 spin_lock_irq(&ide_lock);
1050                 hwif->next = hwgroup->hwif->next;
1051                 hwgroup->hwif->next = hwif;
1052                 BUG_ON(hwif->next == hwif);
1053                 spin_unlock_irq(&ide_lock);
1054         } else {
1055                 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1056                                        hwif_to_node(hwif));
1057                 if (hwgroup == NULL)
1058                         goto out_up;
1059
1060                 hwif->hwgroup = hwgroup;
1061                 hwgroup->hwif = hwif->next = hwif;
1062
1063                 init_timer(&hwgroup->timer);
1064                 hwgroup->timer.function = &ide_timer_expiry;
1065                 hwgroup->timer.data = (unsigned long) hwgroup;
1066         }
1067
1068         /*
1069          * Allocate the irq, if not already obtained for another hwif
1070          */
1071         if (!match || match->irq != hwif->irq) {
1072                 int sa = 0;
1073 #if defined(__mc68000__)
1074                 sa = IRQF_SHARED;
1075 #endif /* __mc68000__ */
1076
1077                 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1078                         sa = IRQF_SHARED;
1079
1080                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1081                         /* clear nIEN */
1082                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1083
1084                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1085                         goto out_unlink;
1086         }
1087
1088         if (!hwif->rqsize) {
1089                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1090                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1091                         hwif->rqsize = 256;
1092                 else
1093                         hwif->rqsize = 65536;
1094         }
1095
1096 #if !defined(__mc68000__)
1097         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1098                 hwif->io_ports[IDE_DATA_OFFSET],
1099                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1100                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1101 #else
1102         printk("%s at 0x%08lx on irq %d", hwif->name,
1103                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1104 #endif /* __mc68000__ */
1105         if (match)
1106                 printk(" (%sed with %s)",
1107                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1108         printk("\n");
1109
1110         mutex_unlock(&ide_cfg_mtx);
1111         return 0;
1112 out_unlink:
1113         ide_remove_port_from_hwgroup(hwif);
1114 out_up:
1115         mutex_unlock(&ide_cfg_mtx);
1116         return 1;
1117 }
1118
1119 static int ata_lock(dev_t dev, void *data)
1120 {
1121         /* FIXME: we want to pin hwif down */
1122         return 0;
1123 }
1124
1125 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1126 {
1127         ide_hwif_t *hwif = data;
1128         int unit = *part >> PARTN_BITS;
1129         ide_drive_t *drive = &hwif->drives[unit];
1130         if (!drive->present)
1131                 return NULL;
1132
1133         if (drive->media == ide_disk)
1134                 request_module("ide-disk");
1135         if (drive->scsi)
1136                 request_module("ide-scsi");
1137         if (drive->media == ide_cdrom || drive->media == ide_optical)
1138                 request_module("ide-cd");
1139         if (drive->media == ide_tape)
1140                 request_module("ide-tape");
1141         if (drive->media == ide_floppy)
1142                 request_module("ide-floppy");
1143
1144         return NULL;
1145 }
1146
1147 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1148 {
1149         struct gendisk *p = data;
1150         *part &= (1 << PARTN_BITS) - 1;
1151         return &p->dev.kobj;
1152 }
1153
1154 static int exact_lock(dev_t dev, void *data)
1155 {
1156         struct gendisk *p = data;
1157
1158         if (!get_disk(p))
1159                 return -1;
1160         return 0;
1161 }
1162
1163 void ide_register_region(struct gendisk *disk)
1164 {
1165         blk_register_region(MKDEV(disk->major, disk->first_minor),
1166                             disk->minors, NULL, exact_match, exact_lock, disk);
1167 }
1168
1169 EXPORT_SYMBOL_GPL(ide_register_region);
1170
1171 void ide_unregister_region(struct gendisk *disk)
1172 {
1173         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1174                               disk->minors);
1175 }
1176
1177 EXPORT_SYMBOL_GPL(ide_unregister_region);
1178
1179 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1180 {
1181         ide_hwif_t *hwif = drive->hwif;
1182         unsigned int unit = (drive->select.all >> 4) & 1;
1183
1184         disk->major = hwif->major;
1185         disk->first_minor = unit << PARTN_BITS;
1186         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1187         disk->queue = drive->queue;
1188 }
1189
1190 EXPORT_SYMBOL_GPL(ide_init_disk);
1191
1192 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1193 {
1194         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1195
1196         if (drive == drive->next) {
1197                 /* special case: last drive from hwgroup. */
1198                 BUG_ON(hwgroup->drive != drive);
1199                 hwgroup->drive = NULL;
1200         } else {
1201                 ide_drive_t *walk;
1202
1203                 walk = hwgroup->drive;
1204                 while (walk->next != drive)
1205                         walk = walk->next;
1206                 walk->next = drive->next;
1207                 if (hwgroup->drive == drive) {
1208                         hwgroup->drive = drive->next;
1209                         hwgroup->hwif = hwgroup->drive->hwif;
1210                 }
1211         }
1212         BUG_ON(hwgroup->drive == drive);
1213 }
1214
1215 static void drive_release_dev (struct device *dev)
1216 {
1217         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1218
1219         ide_proc_unregister_device(drive);
1220
1221         spin_lock_irq(&ide_lock);
1222         ide_remove_drive_from_hwgroup(drive);
1223         kfree(drive->id);
1224         drive->id = NULL;
1225         drive->present = 0;
1226         /* Messed up locking ... */
1227         spin_unlock_irq(&ide_lock);
1228         blk_cleanup_queue(drive->queue);
1229         spin_lock_irq(&ide_lock);
1230         drive->queue = NULL;
1231         spin_unlock_irq(&ide_lock);
1232
1233         complete(&drive->gendev_rel_comp);
1234 }
1235
1236 #ifndef ide_default_irq
1237 #define ide_default_irq(irq) 0
1238 #endif
1239
1240 static int hwif_init(ide_hwif_t *hwif)
1241 {
1242         int old_irq;
1243
1244         if (!hwif->irq) {
1245                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1246                 {
1247                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1248                         return 0;
1249                 }
1250         }
1251
1252         if (register_blkdev(hwif->major, hwif->name))
1253                 return 0;
1254
1255         if (!hwif->sg_max_nents)
1256                 hwif->sg_max_nents = PRD_ENTRIES;
1257
1258         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1259                                  GFP_KERNEL);
1260         if (!hwif->sg_table) {
1261                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1262                 goto out;
1263         }
1264
1265         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1266         
1267         if (init_irq(hwif) == 0)
1268                 goto done;
1269
1270         old_irq = hwif->irq;
1271         /*
1272          *      It failed to initialise. Find the default IRQ for 
1273          *      this port and try that.
1274          */
1275         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1276                 printk("%s: Disabled unable to get IRQ %d.\n",
1277                         hwif->name, old_irq);
1278                 goto out;
1279         }
1280         if (init_irq(hwif)) {
1281                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1282                         hwif->name, old_irq, hwif->irq);
1283                 goto out;
1284         }
1285         printk("%s: probed IRQ %d failed, using default.\n",
1286                 hwif->name, hwif->irq);
1287
1288 done:
1289         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1290                             THIS_MODULE, ata_probe, ata_lock, hwif);
1291         return 1;
1292
1293 out:
1294         unregister_blkdev(hwif->major, hwif->name);
1295         return 0;
1296 }
1297
1298 static void hwif_register_devices(ide_hwif_t *hwif)
1299 {
1300         unsigned int i;
1301
1302         for (i = 0; i < MAX_DRIVES; i++) {
1303                 ide_drive_t *drive = &hwif->drives[i];
1304                 struct device *dev = &drive->gendev;
1305                 int ret;
1306
1307                 if (!drive->present)
1308                         continue;
1309
1310                 ide_add_generic_settings(drive);
1311
1312                 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1313                 dev->parent = &hwif->gendev;
1314                 dev->bus = &ide_bus_type;
1315                 dev->driver_data = drive;
1316                 dev->release = drive_release_dev;
1317
1318                 ret = device_register(dev);
1319                 if (ret < 0)
1320                         printk(KERN_WARNING "IDE: %s: device_register error: "
1321                                             "%d\n", __func__, ret);
1322         }
1323 }
1324
1325 static void ide_port_init_devices(ide_hwif_t *hwif)
1326 {
1327         const struct ide_port_ops *port_ops = hwif->port_ops;
1328         int i;
1329
1330         for (i = 0; i < MAX_DRIVES; i++) {
1331                 ide_drive_t *drive = &hwif->drives[i];
1332
1333                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1334                         drive->io_32bit = 1;
1335                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1336                         drive->unmask = 1;
1337                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1338                         drive->no_unmask = 1;
1339                 if ((hwif->host_flags & IDE_HFLAG_NO_AUTOTUNE) == 0)
1340                         drive->autotune = 1;
1341         }
1342
1343         if (port_ops && port_ops->port_init_devs)
1344                 port_ops->port_init_devs(hwif);
1345 }
1346
1347 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1348                           const struct ide_port_info *d)
1349 {
1350         if (d->chipset != ide_etrax100)
1351                 hwif->channel = port;
1352
1353         if (d->chipset)
1354                 hwif->chipset = d->chipset;
1355
1356         if (d->init_iops)
1357                 d->init_iops(hwif);
1358
1359         if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1360             (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1361                 hwif->irq = port ? 15 : 14;
1362
1363         hwif->host_flags = d->host_flags;
1364         hwif->pio_mask = d->pio_mask;
1365
1366         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1367         if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1368                 hwif->port_ops = d->port_ops;
1369
1370         if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1371             ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1372                 if (hwif->mate)
1373                         hwif->mate->serialized = hwif->serialized = 1;
1374         }
1375
1376         hwif->swdma_mask = d->swdma_mask;
1377         hwif->mwdma_mask = d->mwdma_mask;
1378         hwif->ultra_mask = d->udma_mask;
1379
1380         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1381                 int rc;
1382
1383                 if (d->init_dma)
1384                         rc = d->init_dma(hwif, d);
1385                 else
1386                         rc = ide_hwif_setup_dma(hwif, d);
1387
1388                 if (rc < 0) {
1389                         printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1390                         hwif->swdma_mask = 0;
1391                         hwif->mwdma_mask = 0;
1392                         hwif->ultra_mask = 0;
1393                 } else if (d->dma_ops)
1394                         hwif->dma_ops = d->dma_ops;
1395         }
1396
1397         if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1398                 hwif->rqsize = 256;
1399
1400         /* call chipset specific routine for each enabled port */
1401         if (d->init_hwif)
1402                 d->init_hwif(hwif);
1403 }
1404
1405 static void ide_port_cable_detect(ide_hwif_t *hwif)
1406 {
1407         const struct ide_port_ops *port_ops = hwif->port_ops;
1408
1409         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1410                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1411                         hwif->cbl = port_ops->cable_detect(hwif);
1412         }
1413 }
1414
1415 static ssize_t store_delete_devices(struct device *portdev,
1416                                     struct device_attribute *attr,
1417                                     const char *buf, size_t n)
1418 {
1419         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1420
1421         if (strncmp(buf, "1", n))
1422                 return -EINVAL;
1423
1424         ide_port_unregister_devices(hwif);
1425
1426         return n;
1427 };
1428
1429 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1430
1431 static ssize_t store_scan(struct device *portdev,
1432                           struct device_attribute *attr,
1433                           const char *buf, size_t n)
1434 {
1435         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1436
1437         if (strncmp(buf, "1", n))
1438                 return -EINVAL;
1439
1440         ide_port_unregister_devices(hwif);
1441         ide_port_scan(hwif);
1442
1443         return n;
1444 };
1445
1446 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1447
1448 static struct device_attribute *ide_port_attrs[] = {
1449         &dev_attr_delete_devices,
1450         &dev_attr_scan,
1451         NULL
1452 };
1453
1454 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1455 {
1456         int i, rc;
1457
1458         for (i = 0; ide_port_attrs[i]; i++) {
1459                 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1460                 if (rc)
1461                         break;
1462         }
1463
1464         return rc;
1465 }
1466
1467 /**
1468  *      ide_find_port_slot      -       find free ide_hwifs[] slot
1469  *      @d: IDE port info
1470  *
1471  *      Return the new hwif.  If we are out of free slots return NULL.
1472  */
1473
1474 ide_hwif_t *ide_find_port_slot(const struct ide_port_info *d)
1475 {
1476         ide_hwif_t *hwif;
1477         int i;
1478         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1479
1480         /*
1481          * Claim an unassigned slot.
1482          *
1483          * Give preference to claiming other slots before claiming ide0/ide1,
1484          * just in case there's another interface yet-to-be-scanned
1485          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1486          *
1487          * Unless there is a bootable card that does not use the standard
1488          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1489          */
1490         if (bootable) {
1491                 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;
1492
1493                 for (; i < MAX_HWIFS; i++) {
1494                         hwif = &ide_hwifs[i];
1495                         if (hwif->chipset == ide_unknown)
1496                                 return hwif;
1497                 }
1498         } else {
1499                 for (i = 2; i < MAX_HWIFS; i++) {
1500                         hwif = &ide_hwifs[i];
1501                         if (hwif->chipset == ide_unknown)
1502                                 return hwif;
1503                 }
1504                 for (i = 0; i < 2 && i < MAX_HWIFS; i++) {
1505                         hwif = &ide_hwifs[i];
1506                         if (hwif->chipset == ide_unknown)
1507                                 return hwif;
1508                 }
1509         }
1510
1511         return NULL;
1512 }
1513 EXPORT_SYMBOL_GPL(ide_find_port_slot);
1514
1515 int ide_device_add_all(u8 *idx, const struct ide_port_info *d)
1516 {
1517         ide_hwif_t *hwif, *mate = NULL;
1518         int i, rc = 0;
1519
1520         for (i = 0; i < MAX_HWIFS; i++) {
1521                 if (idx[i] == 0xff) {
1522                         mate = NULL;
1523                         continue;
1524                 }
1525
1526                 hwif = &ide_hwifs[idx[i]];
1527
1528                 ide_port_apply_params(hwif);
1529
1530                 if (d == NULL) {
1531                         mate = NULL;
1532                         continue;
1533                 }
1534
1535                 if (d->chipset != ide_etrax100 && (i & 1) && mate) {
1536                         hwif->mate = mate;
1537                         mate->mate = hwif;
1538                 }
1539
1540                 mate = (i & 1) ? NULL : hwif;
1541
1542                 ide_init_port(hwif, i & 1, d);
1543                 ide_port_cable_detect(hwif);
1544                 ide_port_init_devices(hwif);
1545         }
1546
1547         for (i = 0; i < MAX_HWIFS; i++) {
1548                 if (idx[i] == 0xff)
1549                         continue;
1550
1551                 hwif = &ide_hwifs[idx[i]];
1552
1553                 if (ide_probe_port(hwif) == 0)
1554                         hwif->present = 1;
1555
1556                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1557                     !hwif->mate->present)
1558                         ide_register_port(hwif);
1559
1560                 if (hwif->present)
1561                         ide_port_tune_devices(hwif);
1562         }
1563
1564         for (i = 0; i < MAX_HWIFS; i++) {
1565                 if (idx[i] == 0xff)
1566                         continue;
1567
1568                 hwif = &ide_hwifs[idx[i]];
1569
1570                 if (hwif_init(hwif) == 0) {
1571                         printk(KERN_INFO "%s: failed to initialize IDE "
1572                                          "interface\n", hwif->name);
1573                         hwif->present = 0;
1574                         rc = -1;
1575                         continue;
1576                 }
1577
1578                 if (hwif->present)
1579                         ide_port_setup_devices(hwif);
1580
1581                 ide_acpi_init(hwif);
1582
1583                 if (hwif->present)
1584                         ide_acpi_port_init_devices(hwif);
1585         }
1586
1587         for (i = 0; i < MAX_HWIFS; i++) {
1588                 if (idx[i] == 0xff)
1589                         continue;
1590
1591                 hwif = &ide_hwifs[idx[i]];
1592
1593                 if (hwif->chipset == ide_unknown)
1594                         hwif->chipset = ide_generic;
1595
1596                 if (hwif->present)
1597                         hwif_register_devices(hwif);
1598         }
1599
1600         for (i = 0; i < MAX_HWIFS; i++) {
1601                 if (idx[i] == 0xff)
1602                         continue;
1603
1604                 hwif = &ide_hwifs[idx[i]];
1605
1606                 ide_sysfs_register_port(hwif);
1607                 ide_proc_register_port(hwif);
1608
1609                 if (hwif->present)
1610                         ide_proc_port_register_devices(hwif);
1611         }
1612
1613         return rc;
1614 }
1615 EXPORT_SYMBOL_GPL(ide_device_add_all);
1616
1617 int ide_device_add(u8 idx[4], const struct ide_port_info *d)
1618 {
1619         u8 idx_all[MAX_HWIFS];
1620         int i;
1621
1622         for (i = 0; i < MAX_HWIFS; i++)
1623                 idx_all[i] = (i < 4) ? idx[i] : 0xff;
1624
1625         return ide_device_add_all(idx_all, d);
1626 }
1627 EXPORT_SYMBOL_GPL(ide_device_add);
1628
1629 void ide_port_scan(ide_hwif_t *hwif)
1630 {
1631         ide_port_apply_params(hwif);
1632         ide_port_cable_detect(hwif);
1633         ide_port_init_devices(hwif);
1634
1635         if (ide_probe_port(hwif) < 0)
1636                 return;
1637
1638         hwif->present = 1;
1639
1640         ide_port_tune_devices(hwif);
1641         ide_acpi_port_init_devices(hwif);
1642         ide_port_setup_devices(hwif);
1643         hwif_register_devices(hwif);
1644         ide_proc_port_register_devices(hwif);
1645 }
1646 EXPORT_SYMBOL_GPL(ide_port_scan);
1647
1648 static void ide_legacy_init_one(u8 *idx, hw_regs_t *hw, u8 port_no,
1649                                 const struct ide_port_info *d,
1650                                 unsigned long config)
1651 {
1652         ide_hwif_t *hwif;
1653         unsigned long base, ctl;
1654         int irq;
1655
1656         if (port_no == 0) {
1657                 base = 0x1f0;
1658                 ctl  = 0x3f6;
1659                 irq  = 14;
1660         } else {
1661                 base = 0x170;
1662                 ctl  = 0x376;
1663                 irq  = 15;
1664         }
1665
1666         if (!request_region(base, 8, d->name)) {
1667                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1668                                 d->name, base, base + 7);
1669                 return;
1670         }
1671
1672         if (!request_region(ctl, 1, d->name)) {
1673                 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1674                                 d->name, ctl);
1675                 release_region(base, 8);
1676                 return;
1677         }
1678
1679         ide_std_init_ports(hw, base, ctl);
1680         hw->irq = irq;
1681
1682         hwif = ide_find_port_slot(d);
1683         if (hwif) {
1684                 ide_init_port_hw(hwif, hw);
1685                 if (config)
1686                         hwif->config_data = config;
1687                 idx[port_no] = hwif->index;
1688         }
1689 }
1690
1691 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1692 {
1693         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
1694         hw_regs_t hw[2];
1695
1696         memset(&hw, 0, sizeof(hw));
1697
1698         if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1699                 ide_legacy_init_one(idx, &hw[0], 0, d, config);
1700         ide_legacy_init_one(idx, &hw[1], 1, d, config);
1701
1702         if (idx[0] == 0xff && idx[1] == 0xff &&
1703             (d->host_flags & IDE_HFLAG_SINGLE))
1704                 return -ENOENT;
1705
1706         ide_device_add(idx, d);
1707
1708         return 0;
1709 }
1710 EXPORT_SYMBOL_GPL(ide_legacy_device_add);