Merge master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6] / 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->input_data(drive, NULL, id, SECTOR_SIZE);
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         struct ide_io_ports *io_ports = &hwif->io_ports;
268         int use_altstatus = 0, rc;
269         unsigned long timeout;
270         u8 s = 0, a = 0;
271
272         /* take a deep breath */
273         msleep(50);
274
275         if (io_ports->ctl_addr) {
276                 a = ide_read_altstatus(drive);
277                 s = ide_read_status(drive);
278                 if ((a ^ s) & ~INDEX_STAT)
279                         /* ancient Seagate drives, broken interfaces */
280                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
281                                          "instead of ALTSTATUS(0x%02x)\n",
282                                          drive->name, s, a);
283                 else
284                         /* use non-intrusive polling */
285                         use_altstatus = 1;
286         }
287
288         /* set features register for atapi
289          * identify command to be sure of reply
290          */
291         if ((cmd == WIN_PIDENTIFY))
292                 /* disable dma & overlap */
293                 hwif->OUTB(0, io_ports->feature_addr);
294
295         /* ask drive for ID */
296         hwif->OUTBSYNC(drive, cmd, io_ports->command_addr);
297
298         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
299         timeout += jiffies;
300         do {
301                 if (time_after(jiffies, timeout)) {
302                         /* drive timed-out */
303                         return 1;
304                 }
305                 /* give drive a breather */
306                 msleep(50);
307                 s = use_altstatus ? ide_read_altstatus(drive)
308                                   : ide_read_status(drive);
309         } while (s & BUSY_STAT);
310
311         /* wait for IRQ and DRQ_STAT */
312         msleep(50);
313         s = ide_read_status(drive);
314
315         if (OK_STAT(s, DRQ_STAT, BAD_R_STAT)) {
316                 unsigned long flags;
317
318                 /* local CPU only; some systems need this */
319                 local_irq_save(flags);
320                 /* drive returned ID */
321                 do_identify(drive, cmd);
322                 /* drive responded with ID */
323                 rc = 0;
324                 /* clear drive IRQ */
325                 (void)ide_read_status(drive);
326                 local_irq_restore(flags);
327         } else {
328                 /* drive refused ID */
329                 rc = 2;
330         }
331         return rc;
332 }
333
334 /**
335  *      try_to_identify -       try to identify a drive
336  *      @drive: drive to probe
337  *      @cmd: command to use
338  *
339  *      Issue the identify command and then do IRQ probing to
340  *      complete the identification when needed by finding the
341  *      IRQ the drive is attached to
342  */
343  
344 static int try_to_identify (ide_drive_t *drive, u8 cmd)
345 {
346         ide_hwif_t *hwif = HWIF(drive);
347         int retval;
348         int autoprobe = 0;
349         unsigned long cookie = 0;
350
351         /*
352          * Disable device irq unless we need to
353          * probe for it. Otherwise we'll get spurious
354          * interrupts during the identify-phase that
355          * the irq handler isn't expecting.
356          */
357         if (hwif->io_ports.ctl_addr) {
358                 if (!hwif->irq) {
359                         autoprobe = 1;
360                         cookie = probe_irq_on();
361                 }
362                 ide_set_irq(drive, autoprobe);
363         }
364
365         retval = actual_try_to_identify(drive, cmd);
366
367         if (autoprobe) {
368                 int irq;
369
370                 ide_set_irq(drive, 0);
371                 /* clear drive IRQ */
372                 (void)ide_read_status(drive);
373                 udelay(5);
374                 irq = probe_irq_off(cookie);
375                 if (!hwif->irq) {
376                         if (irq > 0) {
377                                 hwif->irq = irq;
378                         } else {
379                                 /* Mmmm.. multiple IRQs..
380                                  * don't know which was ours
381                                  */
382                                 printk("%s: IRQ probe failed (0x%lx)\n",
383                                         drive->name, cookie);
384                         }
385                 }
386         }
387         return retval;
388 }
389
390 static int ide_busy_sleep(ide_hwif_t *hwif)
391 {
392         unsigned long timeout = jiffies + WAIT_WORSTCASE;
393         u8 stat;
394
395         do {
396                 msleep(50);
397                 stat = hwif->INB(hwif->io_ports.status_addr);
398                 if ((stat & BUSY_STAT) == 0)
399                         return 0;
400         } while (time_before(jiffies, timeout));
401
402         return 1;
403 }
404
405 /**
406  *      do_probe                -       probe an IDE device
407  *      @drive: drive to probe
408  *      @cmd: command to use
409  *
410  *      do_probe() has the difficult job of finding a drive if it exists,
411  *      without getting hung up if it doesn't exist, without trampling on
412  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
413  *
414  *      If a drive is "known" to exist (from CMOS or kernel parameters),
415  *      but does not respond right away, the probe will "hang in there"
416  *      for the maximum wait time (about 30 seconds), otherwise it will
417  *      exit much more quickly.
418  *
419  * Returns:     0  device was identified
420  *              1  device timed-out (no response to identify request)
421  *              2  device aborted the command (refused to identify itself)
422  *              3  bad status from device (possible for ATAPI drives)
423  *              4  probe was not attempted because failure was obvious
424  */
425
426 static int do_probe (ide_drive_t *drive, u8 cmd)
427 {
428         ide_hwif_t *hwif = HWIF(drive);
429         struct ide_io_ports *io_ports = &hwif->io_ports;
430         int rc;
431         u8 stat;
432
433         if (drive->present) {
434                 /* avoid waiting for inappropriate probes */
435                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
436                         return 4;
437         }
438 #ifdef DEBUG
439         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
440                 drive->name, drive->present, drive->media,
441                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
442 #endif
443
444         /* needed for some systems
445          * (e.g. crw9624 as drive0 with disk as slave)
446          */
447         msleep(50);
448         SELECT_DRIVE(drive);
449         msleep(50);
450         if (hwif->INB(io_ports->device_addr) != drive->select.all &&
451             !drive->present) {
452                 if (drive->select.b.unit != 0) {
453                         /* exit with drive0 selected */
454                         SELECT_DRIVE(&hwif->drives[0]);
455                         /* allow BUSY_STAT to assert & clear */
456                         msleep(50);
457                 }
458                 /* no i/f present: mmm.. this should be a 4 -ml */
459                 return 3;
460         }
461
462         stat = ide_read_status(drive);
463
464         if (OK_STAT(stat, READY_STAT, BUSY_STAT) ||
465             drive->present || cmd == WIN_PIDENTIFY) {
466                 /* send cmd and wait */
467                 if ((rc = try_to_identify(drive, cmd))) {
468                         /* failed: try again */
469                         rc = try_to_identify(drive,cmd);
470                 }
471
472                 stat = ide_read_status(drive);
473
474                 if (stat == (BUSY_STAT | READY_STAT))
475                         return 4;
476
477                 if (rc == 1 && cmd == WIN_PIDENTIFY) {
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, io_ports->device_addr);
482                         msleep(50);
483                         hwif->OUTBSYNC(drive, WIN_SRST, io_ports->command_addr);
484                         (void)ide_busy_sleep(hwif);
485                         rc = try_to_identify(drive, cmd);
486                 }
487
488                 /* ensure drive IRQ is clear */
489                 stat = ide_read_status(drive);
490
491                 if (rc == 1)
492                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
493                                         drive->name, stat);
494         } else {
495                 /* not present or maybe ATAPI */
496                 rc = 3;
497         }
498         if (drive->select.b.unit != 0) {
499                 /* exit with drive0 selected */
500                 SELECT_DRIVE(&hwif->drives[0]);
501                 msleep(50);
502                 /* ensure drive irq is clear */
503                 (void)ide_read_status(drive);
504         }
505         return rc;
506 }
507
508 /*
509  *
510  */
511 static void enable_nest (ide_drive_t *drive)
512 {
513         ide_hwif_t *hwif = HWIF(drive);
514         u8 stat;
515
516         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
517         SELECT_DRIVE(drive);
518         msleep(50);
519         hwif->OUTBSYNC(drive, EXABYTE_ENABLE_NEST, hwif->io_ports.command_addr);
520
521         if (ide_busy_sleep(hwif)) {
522                 printk(KERN_CONT "failed (timeout)\n");
523                 return;
524         }
525
526         msleep(50);
527
528         stat = ide_read_status(drive);
529
530         if (!OK_STAT(stat, 0, BAD_STAT))
531                 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
532         else
533                 printk(KERN_CONT "success\n");
534
535         /* if !(success||timed-out) */
536         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
537                 /* look for ATAPI device */
538                 (void) do_probe(drive, WIN_PIDENTIFY);
539         }
540 }
541
542 /**
543  *      probe_for_drives        -       upper level drive probe
544  *      @drive: drive to probe for
545  *
546  *      probe_for_drive() tests for existence of a given drive using do_probe()
547  *      and presents things to the user as needed.
548  *
549  *      Returns:        0  no device was found
550  *                      1  device was found (note: drive->present might
551  *                         still be 0)
552  */
553  
554 static inline u8 probe_for_drive (ide_drive_t *drive)
555 {
556         /*
557          *      In order to keep things simple we have an id
558          *      block for all drives at all times. If the device
559          *      is pre ATA or refuses ATA/ATAPI identify we
560          *      will add faked data to this.
561          *
562          *      Also note that 0 everywhere means "can't do X"
563          */
564  
565         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
566         drive->id_read = 0;
567         if(drive->id == NULL)
568         {
569                 printk(KERN_ERR "ide: out of memory for id data.\n");
570                 return 0;
571         }
572         strcpy(drive->id->model, "UNKNOWN");
573         
574         /* skip probing? */
575         if (!drive->noprobe)
576         {
577                 /* if !(success||timed-out) */
578                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
579                         /* look for ATAPI device */
580                         (void) do_probe(drive, WIN_PIDENTIFY);
581                 }
582                 if (!drive->present)
583                         /* drive not found */
584                         return 0;
585                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
586                         enable_nest(drive);
587         
588                 /* identification failed? */
589                 if (!drive->id_read) {
590                         if (drive->media == ide_disk) {
591                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
592                                         drive->name, drive->cyl,
593                                         drive->head, drive->sect);
594                         } else if (drive->media == ide_cdrom) {
595                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
596                         } else {
597                                 /* nuke it */
598                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
599                                 drive->present = 0;
600                         }
601                 }
602                 /* drive was found */
603         }
604         if(!drive->present)
605                 return 0;
606         /* The drive wasn't being helpful. Add generic info only */
607         if (drive->id_read == 0) {
608                 generic_id(drive);
609                 return 1;
610         }
611
612         if (drive->media == ide_disk) {
613                 ide_disk_init_chs(drive);
614                 ide_disk_init_mult_count(drive);
615         }
616
617         return drive->present;
618 }
619
620 static void hwif_release_dev (struct device *dev)
621 {
622         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
623
624         complete(&hwif->gendev_rel_comp);
625 }
626
627 static int ide_register_port(ide_hwif_t *hwif)
628 {
629         int ret;
630
631         /* register with global device tree */
632         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
633         hwif->gendev.driver_data = hwif;
634         if (hwif->gendev.parent == NULL) {
635                 if (hwif->dev)
636                         hwif->gendev.parent = hwif->dev;
637                 else
638                         /* Would like to do = &device_legacy */
639                         hwif->gendev.parent = NULL;
640         }
641         hwif->gendev.release = hwif_release_dev;
642         ret = device_register(&hwif->gendev);
643         if (ret < 0) {
644                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
645                         __func__, ret);
646                 goto out;
647         }
648
649         get_device(&hwif->gendev);
650
651         hwif->portdev = device_create(ide_port_class, &hwif->gendev,
652                                       MKDEV(0, 0), hwif->name);
653         if (IS_ERR(hwif->portdev)) {
654                 ret = PTR_ERR(hwif->portdev);
655                 device_unregister(&hwif->gendev);
656         }
657         dev_set_drvdata(hwif->portdev, hwif);
658 out:
659         return ret;
660 }
661
662 /**
663  *      ide_port_wait_ready     -       wait for port to become ready
664  *      @hwif: IDE port
665  *
666  *      This is needed on some PPCs and a bunch of BIOS-less embedded
667  *      platforms.  Typical cases are:
668  *
669  *      - The firmware hard reset the disk before booting the kernel,
670  *        the drive is still doing it's poweron-reset sequence, that
671  *        can take up to 30 seconds.
672  *
673  *      - The firmware does nothing (or no firmware), the device is
674  *        still in POST state (same as above actually).
675  *
676  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
677  *        their reset sequence even when they are non-selected slave
678  *        devices, thus preventing discovery of the main HD.
679  *
680  *      Doing this wait-for-non-busy should not harm any existing
681  *      configuration and fix some issues like the above.
682  *
683  *      BenH.
684  *
685  *      Returns 0 on success, error code (< 0) otherwise.
686  */
687
688 static int ide_port_wait_ready(ide_hwif_t *hwif)
689 {
690         int unit, rc;
691
692         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
693
694         /* Let HW settle down a bit from whatever init state we
695          * come from */
696         mdelay(2);
697
698         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
699          * I know of at least one disk who takes 31 seconds, I use 35
700          * here to be safe
701          */
702         rc = ide_wait_not_busy(hwif, 35000);
703         if (rc)
704                 return rc;
705
706         /* Now make sure both master & slave are ready */
707         for (unit = 0; unit < MAX_DRIVES; unit++) {
708                 ide_drive_t *drive = &hwif->drives[unit];
709
710                 /* Ignore disks that we will not probe for later. */
711                 if (!drive->noprobe || drive->present) {
712                         SELECT_DRIVE(drive);
713                         ide_set_irq(drive, 1);
714                         mdelay(2);
715                         rc = ide_wait_not_busy(hwif, 35000);
716                         if (rc)
717                                 goto out;
718                 } else
719                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
720                                           drive->name);
721         }
722 out:
723         /* Exit function with master reselected (let's be sane) */
724         if (unit)
725                 SELECT_DRIVE(&hwif->drives[0]);
726
727         return rc;
728 }
729
730 /**
731  *      ide_undecoded_slave     -       look for bad CF adapters
732  *      @drive1: drive
733  *
734  *      Analyse the drives on the interface and attempt to decide if we
735  *      have the same drive viewed twice. This occurs with crap CF adapters
736  *      and PCMCIA sometimes.
737  */
738
739 void ide_undecoded_slave(ide_drive_t *drive1)
740 {
741         ide_drive_t *drive0 = &drive1->hwif->drives[0];
742
743         if ((drive1->dn & 1) == 0 || drive0->present == 0)
744                 return;
745
746         /* If the models don't match they are not the same product */
747         if (strcmp(drive0->id->model, drive1->id->model))
748                 return;
749
750         /* Serial numbers do not match */
751         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
752                 return;
753
754         /* No serial number, thankfully very rare for CF */
755         if (drive0->id->serial_no[0] == 0)
756                 return;
757
758         /* Appears to be an IDE flash adapter with decode bugs */
759         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
760
761         drive1->present = 0;
762 }
763
764 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
765
766 static int ide_probe_port(ide_hwif_t *hwif)
767 {
768         unsigned long flags;
769         unsigned int irqd;
770         int unit, rc = -ENODEV;
771
772         BUG_ON(hwif->present);
773
774         if (hwif->drives[0].noprobe && hwif->drives[1].noprobe)
775                 return -EACCES;
776
777         /*
778          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
779          * we'll install our IRQ driver much later...
780          */
781         irqd = hwif->irq;
782         if (irqd)
783                 disable_irq(hwif->irq);
784
785         local_irq_set(flags);
786
787         if (ide_port_wait_ready(hwif) == -EBUSY)
788                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
789
790         /*
791          * Second drive should only exist if first drive was found,
792          * but a lot of cdrom drives are configured as single slaves.
793          */
794         for (unit = 0; unit < MAX_DRIVES; ++unit) {
795                 ide_drive_t *drive = &hwif->drives[unit];
796                 drive->dn = (hwif->channel ? 2 : 0) + unit;
797                 (void) probe_for_drive(drive);
798                 if (drive->present)
799                         rc = 0;
800         }
801
802         local_irq_restore(flags);
803
804         /*
805          * Use cached IRQ number. It might be (and is...) changed by probe
806          * code above
807          */
808         if (irqd)
809                 enable_irq(irqd);
810
811         return rc;
812 }
813
814 static void ide_port_tune_devices(ide_hwif_t *hwif)
815 {
816         const struct ide_port_ops *port_ops = hwif->port_ops;
817         int unit;
818
819         for (unit = 0; unit < MAX_DRIVES; unit++) {
820                 ide_drive_t *drive = &hwif->drives[unit];
821
822                 if (drive->present && port_ops && port_ops->quirkproc)
823                         port_ops->quirkproc(drive);
824         }
825
826         for (unit = 0; unit < MAX_DRIVES; ++unit) {
827                 ide_drive_t *drive = &hwif->drives[unit];
828
829                 if (drive->present) {
830                         ide_set_max_pio(drive);
831
832                         drive->nice1 = 1;
833
834                         if (hwif->dma_ops)
835                                 ide_set_dma(drive);
836                 }
837         }
838
839         for (unit = 0; unit < MAX_DRIVES; ++unit) {
840                 ide_drive_t *drive = &hwif->drives[unit];
841
842                 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
843                         drive->no_io_32bit = 1;
844                 else
845                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
846         }
847 }
848
849 #if MAX_HWIFS > 1
850 /*
851  * save_match() is used to simplify logic in init_irq() below.
852  *
853  * A loophole here is that we may not know about a particular
854  * hwif's irq until after that hwif is actually probed/initialized..
855  * This could be a problem for the case where an hwif is on a
856  * dual interface that requires serialization (eg. cmd640) and another
857  * hwif using one of the same irqs is initialized beforehand.
858  *
859  * This routine detects and reports such situations, but does not fix them.
860  */
861 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
862 {
863         ide_hwif_t *m = *match;
864
865         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
866                 if (!new->hwgroup)
867                         return;
868                 printk("%s: potential irq problem with %s and %s\n",
869                         hwif->name, new->name, m->name);
870         }
871         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
872                 *match = new;
873 }
874 #endif /* MAX_HWIFS > 1 */
875
876 /*
877  * init request queue
878  */
879 static int ide_init_queue(ide_drive_t *drive)
880 {
881         struct request_queue *q;
882         ide_hwif_t *hwif = HWIF(drive);
883         int max_sectors = 256;
884         int max_sg_entries = PRD_ENTRIES;
885
886         /*
887          *      Our default set up assumes the normal IDE case,
888          *      that is 64K segmenting, standard PRD setup
889          *      and LBA28. Some drivers then impose their own
890          *      limits and LBA48 we could raise it but as yet
891          *      do not.
892          */
893
894         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
895         if (!q)
896                 return 1;
897
898         q->queuedata = drive;
899         blk_queue_segment_boundary(q, 0xffff);
900
901         if (hwif->rqsize < max_sectors)
902                 max_sectors = hwif->rqsize;
903         blk_queue_max_sectors(q, max_sectors);
904
905 #ifdef CONFIG_PCI
906         /* When we have an IOMMU, we may have a problem where pci_map_sg()
907          * creates segments that don't completely match our boundary
908          * requirements and thus need to be broken up again. Because it
909          * doesn't align properly either, we may actually have to break up
910          * to more segments than what was we got in the first place, a max
911          * worst case is twice as many.
912          * This will be fixed once we teach pci_map_sg() about our boundary
913          * requirements, hopefully soon. *FIXME*
914          */
915         if (!PCI_DMA_BUS_IS_PHYS)
916                 max_sg_entries >>= 1;
917 #endif /* CONFIG_PCI */
918
919         blk_queue_max_hw_segments(q, max_sg_entries);
920         blk_queue_max_phys_segments(q, max_sg_entries);
921
922         /* assign drive queue */
923         drive->queue = q;
924
925         /* needs drive->queue to be set */
926         ide_toggle_bounce(drive, 1);
927
928         return 0;
929 }
930
931 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
932 {
933         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
934
935         spin_lock_irq(&ide_lock);
936         if (!hwgroup->drive) {
937                 /* first drive for hwgroup. */
938                 drive->next = drive;
939                 hwgroup->drive = drive;
940                 hwgroup->hwif = HWIF(hwgroup->drive);
941         } else {
942                 drive->next = hwgroup->drive->next;
943                 hwgroup->drive->next = drive;
944         }
945         spin_unlock_irq(&ide_lock);
946 }
947
948 /*
949  * For any present drive:
950  * - allocate the block device queue
951  * - link drive into the hwgroup
952  */
953 static void ide_port_setup_devices(ide_hwif_t *hwif)
954 {
955         int i;
956
957         mutex_lock(&ide_cfg_mtx);
958         for (i = 0; i < MAX_DRIVES; i++) {
959                 ide_drive_t *drive = &hwif->drives[i];
960
961                 if (!drive->present)
962                         continue;
963
964                 if (ide_init_queue(drive)) {
965                         printk(KERN_ERR "ide: failed to init %s\n",
966                                         drive->name);
967                         continue;
968                 }
969
970                 ide_add_drive_to_hwgroup(drive);
971         }
972         mutex_unlock(&ide_cfg_mtx);
973 }
974
975 /*
976  * This routine sets up the irq for an ide interface, and creates a new
977  * hwgroup for the irq/hwif if none was previously assigned.
978  *
979  * Much of the code is for correctly detecting/handling irq sharing
980  * and irq serialization situations.  This is somewhat complex because
981  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
982  */
983 static int init_irq (ide_hwif_t *hwif)
984 {
985         struct ide_io_ports *io_ports = &hwif->io_ports;
986         unsigned int index;
987         ide_hwgroup_t *hwgroup;
988         ide_hwif_t *match = NULL;
989
990
991         BUG_ON(in_interrupt());
992         BUG_ON(irqs_disabled());        
993         BUG_ON(hwif == NULL);
994
995         mutex_lock(&ide_cfg_mtx);
996         hwif->hwgroup = NULL;
997 #if MAX_HWIFS > 1
998         /*
999          * Group up with any other hwifs that share our irq(s).
1000          */
1001         for (index = 0; index < MAX_HWIFS; index++) {
1002                 ide_hwif_t *h = &ide_hwifs[index];
1003                 if (h->hwgroup) {  /* scan only initialized hwif's */
1004                         if (hwif->irq == h->irq) {
1005                                 hwif->sharing_irq = h->sharing_irq = 1;
1006                                 if (hwif->chipset != ide_pci ||
1007                                     h->chipset != ide_pci) {
1008                                         save_match(hwif, h, &match);
1009                                 }
1010                         }
1011                         if (hwif->serialized) {
1012                                 if (hwif->mate && hwif->mate->irq == h->irq)
1013                                         save_match(hwif, h, &match);
1014                         }
1015                         if (h->serialized) {
1016                                 if (h->mate && hwif->irq == h->mate->irq)
1017                                         save_match(hwif, h, &match);
1018                         }
1019                 }
1020         }
1021 #endif /* MAX_HWIFS > 1 */
1022         /*
1023          * If we are still without a hwgroup, then form a new one
1024          */
1025         if (match) {
1026                 hwgroup = match->hwgroup;
1027                 hwif->hwgroup = hwgroup;
1028                 /*
1029                  * Link us into the hwgroup.
1030                  * This must be done early, do ensure that unexpected_intr
1031                  * can find the hwif and prevent irq storms.
1032                  * No drives are attached to the new hwif, choose_drive
1033                  * can't do anything stupid (yet).
1034                  * Add ourself as the 2nd entry to the hwgroup->hwif
1035                  * linked list, the first entry is the hwif that owns
1036                  * hwgroup->handler - do not change that.
1037                  */
1038                 spin_lock_irq(&ide_lock);
1039                 hwif->next = hwgroup->hwif->next;
1040                 hwgroup->hwif->next = hwif;
1041                 BUG_ON(hwif->next == hwif);
1042                 spin_unlock_irq(&ide_lock);
1043         } else {
1044                 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1045                                        hwif_to_node(hwif));
1046                 if (hwgroup == NULL)
1047                         goto out_up;
1048
1049                 hwif->hwgroup = hwgroup;
1050                 hwgroup->hwif = hwif->next = hwif;
1051
1052                 init_timer(&hwgroup->timer);
1053                 hwgroup->timer.function = &ide_timer_expiry;
1054                 hwgroup->timer.data = (unsigned long) hwgroup;
1055         }
1056
1057         /*
1058          * Allocate the irq, if not already obtained for another hwif
1059          */
1060         if (!match || match->irq != hwif->irq) {
1061                 int sa = 0;
1062 #if defined(__mc68000__)
1063                 sa = IRQF_SHARED;
1064 #endif /* __mc68000__ */
1065
1066                 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1067                         sa = IRQF_SHARED;
1068
1069                 if (io_ports->ctl_addr)
1070                         /* clear nIEN */
1071                         hwif->OUTB(0x08, io_ports->ctl_addr);
1072
1073                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1074                         goto out_unlink;
1075         }
1076
1077         if (!hwif->rqsize) {
1078                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1079                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1080                         hwif->rqsize = 256;
1081                 else
1082                         hwif->rqsize = 65536;
1083         }
1084
1085 #if !defined(__mc68000__)
1086         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1087                 io_ports->data_addr, io_ports->status_addr,
1088                 io_ports->ctl_addr, hwif->irq);
1089 #else
1090         printk("%s at 0x%08lx on irq %d", hwif->name,
1091                 io_ports->data_addr, hwif->irq);
1092 #endif /* __mc68000__ */
1093         if (match)
1094                 printk(" (%sed with %s)",
1095                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1096         printk("\n");
1097
1098         mutex_unlock(&ide_cfg_mtx);
1099         return 0;
1100 out_unlink:
1101         ide_remove_port_from_hwgroup(hwif);
1102 out_up:
1103         mutex_unlock(&ide_cfg_mtx);
1104         return 1;
1105 }
1106
1107 static int ata_lock(dev_t dev, void *data)
1108 {
1109         /* FIXME: we want to pin hwif down */
1110         return 0;
1111 }
1112
1113 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1114 {
1115         ide_hwif_t *hwif = data;
1116         int unit = *part >> PARTN_BITS;
1117         ide_drive_t *drive = &hwif->drives[unit];
1118         if (!drive->present)
1119                 return NULL;
1120
1121         if (drive->media == ide_disk)
1122                 request_module("ide-disk");
1123         if (drive->scsi)
1124                 request_module("ide-scsi");
1125         if (drive->media == ide_cdrom || drive->media == ide_optical)
1126                 request_module("ide-cd");
1127         if (drive->media == ide_tape)
1128                 request_module("ide-tape");
1129         if (drive->media == ide_floppy)
1130                 request_module("ide-floppy");
1131
1132         return NULL;
1133 }
1134
1135 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1136 {
1137         struct gendisk *p = data;
1138         *part &= (1 << PARTN_BITS) - 1;
1139         return &p->dev.kobj;
1140 }
1141
1142 static int exact_lock(dev_t dev, void *data)
1143 {
1144         struct gendisk *p = data;
1145
1146         if (!get_disk(p))
1147                 return -1;
1148         return 0;
1149 }
1150
1151 void ide_register_region(struct gendisk *disk)
1152 {
1153         blk_register_region(MKDEV(disk->major, disk->first_minor),
1154                             disk->minors, NULL, exact_match, exact_lock, disk);
1155 }
1156
1157 EXPORT_SYMBOL_GPL(ide_register_region);
1158
1159 void ide_unregister_region(struct gendisk *disk)
1160 {
1161         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1162                               disk->minors);
1163 }
1164
1165 EXPORT_SYMBOL_GPL(ide_unregister_region);
1166
1167 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1168 {
1169         ide_hwif_t *hwif = drive->hwif;
1170         unsigned int unit = (drive->select.all >> 4) & 1;
1171
1172         disk->major = hwif->major;
1173         disk->first_minor = unit << PARTN_BITS;
1174         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1175         disk->queue = drive->queue;
1176 }
1177
1178 EXPORT_SYMBOL_GPL(ide_init_disk);
1179
1180 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1181 {
1182         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1183
1184         if (drive == drive->next) {
1185                 /* special case: last drive from hwgroup. */
1186                 BUG_ON(hwgroup->drive != drive);
1187                 hwgroup->drive = NULL;
1188         } else {
1189                 ide_drive_t *walk;
1190
1191                 walk = hwgroup->drive;
1192                 while (walk->next != drive)
1193                         walk = walk->next;
1194                 walk->next = drive->next;
1195                 if (hwgroup->drive == drive) {
1196                         hwgroup->drive = drive->next;
1197                         hwgroup->hwif = hwgroup->drive->hwif;
1198                 }
1199         }
1200         BUG_ON(hwgroup->drive == drive);
1201 }
1202
1203 static void drive_release_dev (struct device *dev)
1204 {
1205         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1206
1207         ide_proc_unregister_device(drive);
1208
1209         spin_lock_irq(&ide_lock);
1210         ide_remove_drive_from_hwgroup(drive);
1211         kfree(drive->id);
1212         drive->id = NULL;
1213         drive->present = 0;
1214         /* Messed up locking ... */
1215         spin_unlock_irq(&ide_lock);
1216         blk_cleanup_queue(drive->queue);
1217         spin_lock_irq(&ide_lock);
1218         drive->queue = NULL;
1219         spin_unlock_irq(&ide_lock);
1220
1221         complete(&drive->gendev_rel_comp);
1222 }
1223
1224 #ifndef ide_default_irq
1225 #define ide_default_irq(irq) 0
1226 #endif
1227
1228 static int hwif_init(ide_hwif_t *hwif)
1229 {
1230         int old_irq;
1231
1232         if (!hwif->irq) {
1233                 hwif->irq = ide_default_irq(hwif->io_ports.data_addr);
1234                 if (!hwif->irq) {
1235                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1236                         return 0;
1237                 }
1238         }
1239
1240         if (register_blkdev(hwif->major, hwif->name))
1241                 return 0;
1242
1243         if (!hwif->sg_max_nents)
1244                 hwif->sg_max_nents = PRD_ENTRIES;
1245
1246         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1247                                  GFP_KERNEL);
1248         if (!hwif->sg_table) {
1249                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1250                 goto out;
1251         }
1252
1253         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1254         
1255         if (init_irq(hwif) == 0)
1256                 goto done;
1257
1258         old_irq = hwif->irq;
1259         /*
1260          *      It failed to initialise. Find the default IRQ for 
1261          *      this port and try that.
1262          */
1263         hwif->irq = ide_default_irq(hwif->io_ports.data_addr);
1264         if (!hwif->irq) {
1265                 printk("%s: Disabled unable to get IRQ %d.\n",
1266                         hwif->name, old_irq);
1267                 goto out;
1268         }
1269         if (init_irq(hwif)) {
1270                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1271                         hwif->name, old_irq, hwif->irq);
1272                 goto out;
1273         }
1274         printk("%s: probed IRQ %d failed, using default.\n",
1275                 hwif->name, hwif->irq);
1276
1277 done:
1278         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1279                             THIS_MODULE, ata_probe, ata_lock, hwif);
1280         return 1;
1281
1282 out:
1283         unregister_blkdev(hwif->major, hwif->name);
1284         return 0;
1285 }
1286
1287 static void hwif_register_devices(ide_hwif_t *hwif)
1288 {
1289         unsigned int i;
1290
1291         for (i = 0; i < MAX_DRIVES; i++) {
1292                 ide_drive_t *drive = &hwif->drives[i];
1293                 struct device *dev = &drive->gendev;
1294                 int ret;
1295
1296                 if (!drive->present)
1297                         continue;
1298
1299                 ide_add_generic_settings(drive);
1300
1301                 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1302                 dev->parent = &hwif->gendev;
1303                 dev->bus = &ide_bus_type;
1304                 dev->driver_data = drive;
1305                 dev->release = drive_release_dev;
1306
1307                 ret = device_register(dev);
1308                 if (ret < 0)
1309                         printk(KERN_WARNING "IDE: %s: device_register error: "
1310                                             "%d\n", __func__, ret);
1311         }
1312 }
1313
1314 static void ide_port_init_devices(ide_hwif_t *hwif)
1315 {
1316         const struct ide_port_ops *port_ops = hwif->port_ops;
1317         int i;
1318
1319         for (i = 0; i < MAX_DRIVES; i++) {
1320                 ide_drive_t *drive = &hwif->drives[i];
1321
1322                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1323                         drive->io_32bit = 1;
1324                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1325                         drive->unmask = 1;
1326                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1327                         drive->no_unmask = 1;
1328         }
1329
1330         if (port_ops && port_ops->port_init_devs)
1331                 port_ops->port_init_devs(hwif);
1332 }
1333
1334 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1335                           const struct ide_port_info *d)
1336 {
1337         if (d->chipset != ide_etrax100)
1338                 hwif->channel = port;
1339
1340         if (d->chipset)
1341                 hwif->chipset = d->chipset;
1342
1343         if (d->init_iops)
1344                 d->init_iops(hwif);
1345
1346         if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1347             (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1348                 hwif->irq = port ? 15 : 14;
1349
1350         hwif->host_flags = d->host_flags;
1351         hwif->pio_mask = d->pio_mask;
1352
1353         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1354         if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1355                 hwif->port_ops = d->port_ops;
1356
1357         if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1358             ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1359                 if (hwif->mate)
1360                         hwif->mate->serialized = hwif->serialized = 1;
1361         }
1362
1363         hwif->swdma_mask = d->swdma_mask;
1364         hwif->mwdma_mask = d->mwdma_mask;
1365         hwif->ultra_mask = d->udma_mask;
1366
1367         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1368                 int rc;
1369
1370                 if (d->init_dma)
1371                         rc = d->init_dma(hwif, d);
1372                 else
1373                         rc = ide_hwif_setup_dma(hwif, d);
1374
1375                 if (rc < 0) {
1376                         printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1377                         hwif->swdma_mask = 0;
1378                         hwif->mwdma_mask = 0;
1379                         hwif->ultra_mask = 0;
1380                 } else if (d->dma_ops)
1381                         hwif->dma_ops = d->dma_ops;
1382         }
1383
1384         if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1385                 hwif->rqsize = 256;
1386
1387         /* call chipset specific routine for each enabled port */
1388         if (d->init_hwif)
1389                 d->init_hwif(hwif);
1390 }
1391
1392 static void ide_port_cable_detect(ide_hwif_t *hwif)
1393 {
1394         const struct ide_port_ops *port_ops = hwif->port_ops;
1395
1396         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1397                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1398                         hwif->cbl = port_ops->cable_detect(hwif);
1399         }
1400 }
1401
1402 static ssize_t store_delete_devices(struct device *portdev,
1403                                     struct device_attribute *attr,
1404                                     const char *buf, size_t n)
1405 {
1406         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1407
1408         if (strncmp(buf, "1", n))
1409                 return -EINVAL;
1410
1411         ide_port_unregister_devices(hwif);
1412
1413         return n;
1414 };
1415
1416 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1417
1418 static ssize_t store_scan(struct device *portdev,
1419                           struct device_attribute *attr,
1420                           const char *buf, size_t n)
1421 {
1422         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1423
1424         if (strncmp(buf, "1", n))
1425                 return -EINVAL;
1426
1427         ide_port_unregister_devices(hwif);
1428         ide_port_scan(hwif);
1429
1430         return n;
1431 };
1432
1433 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1434
1435 static struct device_attribute *ide_port_attrs[] = {
1436         &dev_attr_delete_devices,
1437         &dev_attr_scan,
1438         NULL
1439 };
1440
1441 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1442 {
1443         int i, rc;
1444
1445         for (i = 0; ide_port_attrs[i]; i++) {
1446                 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1447                 if (rc)
1448                         break;
1449         }
1450
1451         return rc;
1452 }
1453
1454 /**
1455  *      ide_find_port_slot      -       find free ide_hwifs[] slot
1456  *      @d: IDE port info
1457  *
1458  *      Return the new hwif.  If we are out of free slots return NULL.
1459  */
1460
1461 ide_hwif_t *ide_find_port_slot(const struct ide_port_info *d)
1462 {
1463         ide_hwif_t *hwif;
1464         int i;
1465         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1466
1467         /*
1468          * Claim an unassigned slot.
1469          *
1470          * Give preference to claiming other slots before claiming ide0/ide1,
1471          * just in case there's another interface yet-to-be-scanned
1472          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1473          *
1474          * Unless there is a bootable card that does not use the standard
1475          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1476          */
1477         if (bootable) {
1478                 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;
1479
1480                 for (; i < MAX_HWIFS; i++) {
1481                         hwif = &ide_hwifs[i];
1482                         if (hwif->chipset == ide_unknown)
1483                                 return hwif;
1484                 }
1485         } else {
1486                 for (i = 2; i < MAX_HWIFS; i++) {
1487                         hwif = &ide_hwifs[i];
1488                         if (hwif->chipset == ide_unknown)
1489                                 return hwif;
1490                 }
1491                 for (i = 0; i < 2 && i < MAX_HWIFS; i++) {
1492                         hwif = &ide_hwifs[i];
1493                         if (hwif->chipset == ide_unknown)
1494                                 return hwif;
1495                 }
1496         }
1497
1498         return NULL;
1499 }
1500 EXPORT_SYMBOL_GPL(ide_find_port_slot);
1501
1502 int ide_device_add_all(u8 *idx, const struct ide_port_info *d)
1503 {
1504         ide_hwif_t *hwif, *mate = NULL;
1505         int i, rc = 0;
1506
1507         for (i = 0; i < MAX_HWIFS; i++) {
1508                 if (idx[i] == 0xff) {
1509                         mate = NULL;
1510                         continue;
1511                 }
1512
1513                 hwif = &ide_hwifs[idx[i]];
1514
1515                 ide_port_apply_params(hwif);
1516
1517                 if (d == NULL) {
1518                         mate = NULL;
1519                         continue;
1520                 }
1521
1522                 if (d->chipset != ide_etrax100 && (i & 1) && mate) {
1523                         hwif->mate = mate;
1524                         mate->mate = hwif;
1525                 }
1526
1527                 mate = (i & 1) ? NULL : hwif;
1528
1529                 ide_init_port(hwif, i & 1, d);
1530                 ide_port_cable_detect(hwif);
1531                 ide_port_init_devices(hwif);
1532         }
1533
1534         for (i = 0; i < MAX_HWIFS; i++) {
1535                 if (idx[i] == 0xff)
1536                         continue;
1537
1538                 hwif = &ide_hwifs[idx[i]];
1539
1540                 if (ide_probe_port(hwif) == 0)
1541                         hwif->present = 1;
1542
1543                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1544                     !hwif->mate->present)
1545                         ide_register_port(hwif);
1546
1547                 if (hwif->present)
1548                         ide_port_tune_devices(hwif);
1549         }
1550
1551         for (i = 0; i < MAX_HWIFS; i++) {
1552                 if (idx[i] == 0xff)
1553                         continue;
1554
1555                 hwif = &ide_hwifs[idx[i]];
1556
1557                 if (hwif_init(hwif) == 0) {
1558                         printk(KERN_INFO "%s: failed to initialize IDE "
1559                                          "interface\n", hwif->name);
1560                         hwif->present = 0;
1561                         rc = -1;
1562                         continue;
1563                 }
1564
1565                 if (hwif->present)
1566                         ide_port_setup_devices(hwif);
1567
1568                 ide_acpi_init(hwif);
1569
1570                 if (hwif->present)
1571                         ide_acpi_port_init_devices(hwif);
1572         }
1573
1574         for (i = 0; i < MAX_HWIFS; i++) {
1575                 if (idx[i] == 0xff)
1576                         continue;
1577
1578                 hwif = &ide_hwifs[idx[i]];
1579
1580                 if (hwif->chipset == ide_unknown)
1581                         hwif->chipset = ide_generic;
1582
1583                 if (hwif->present)
1584                         hwif_register_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                 ide_sysfs_register_port(hwif);
1594                 ide_proc_register_port(hwif);
1595
1596                 if (hwif->present)
1597                         ide_proc_port_register_devices(hwif);
1598         }
1599
1600         return rc;
1601 }
1602 EXPORT_SYMBOL_GPL(ide_device_add_all);
1603
1604 int ide_device_add(u8 idx[4], const struct ide_port_info *d)
1605 {
1606         u8 idx_all[MAX_HWIFS];
1607         int i;
1608
1609         for (i = 0; i < MAX_HWIFS; i++)
1610                 idx_all[i] = (i < 4) ? idx[i] : 0xff;
1611
1612         return ide_device_add_all(idx_all, d);
1613 }
1614 EXPORT_SYMBOL_GPL(ide_device_add);
1615
1616 void ide_port_scan(ide_hwif_t *hwif)
1617 {
1618         ide_port_apply_params(hwif);
1619         ide_port_cable_detect(hwif);
1620         ide_port_init_devices(hwif);
1621
1622         if (ide_probe_port(hwif) < 0)
1623                 return;
1624
1625         hwif->present = 1;
1626
1627         ide_port_tune_devices(hwif);
1628         ide_acpi_port_init_devices(hwif);
1629         ide_port_setup_devices(hwif);
1630         hwif_register_devices(hwif);
1631         ide_proc_port_register_devices(hwif);
1632 }
1633 EXPORT_SYMBOL_GPL(ide_port_scan);
1634
1635 static void ide_legacy_init_one(u8 *idx, hw_regs_t *hw, u8 port_no,
1636                                 const struct ide_port_info *d,
1637                                 unsigned long config)
1638 {
1639         ide_hwif_t *hwif;
1640         unsigned long base, ctl;
1641         int irq;
1642
1643         if (port_no == 0) {
1644                 base = 0x1f0;
1645                 ctl  = 0x3f6;
1646                 irq  = 14;
1647         } else {
1648                 base = 0x170;
1649                 ctl  = 0x376;
1650                 irq  = 15;
1651         }
1652
1653         if (!request_region(base, 8, d->name)) {
1654                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1655                                 d->name, base, base + 7);
1656                 return;
1657         }
1658
1659         if (!request_region(ctl, 1, d->name)) {
1660                 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1661                                 d->name, ctl);
1662                 release_region(base, 8);
1663                 return;
1664         }
1665
1666         ide_std_init_ports(hw, base, ctl);
1667         hw->irq = irq;
1668
1669         hwif = ide_find_port_slot(d);
1670         if (hwif) {
1671                 ide_init_port_hw(hwif, hw);
1672                 if (config)
1673                         hwif->config_data = config;
1674                 idx[port_no] = hwif->index;
1675         }
1676 }
1677
1678 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1679 {
1680         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
1681         hw_regs_t hw[2];
1682
1683         memset(&hw, 0, sizeof(hw));
1684
1685         if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1686                 ide_legacy_init_one(idx, &hw[0], 0, d, config);
1687         ide_legacy_init_one(idx, &hw[1], 1, d, config);
1688
1689         if (idx[0] == 0xff && idx[1] == 0xff &&
1690             (d->host_flags & IDE_HFLAG_SINGLE))
1691                 return -ENOENT;
1692
1693         ide_device_add(idx, d);
1694
1695         return 0;
1696 }
1697 EXPORT_SYMBOL_GPL(ide_legacy_device_add);