ide: tighten checks on PCI BARs in ide_hwif_configure()
[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 static ide_hwif_t ide_hwifs[MAX_HWIFS]; /* master data repository */
43
44 /**
45  *      generic_id              -       add a generic drive id
46  *      @drive: drive to make an ID block for
47  *      
48  *      Add a fake id field to the drive we are passed. This allows
49  *      use to skip a ton of NULL checks (which people always miss) 
50  *      and make drive properties unconditional outside of this file
51  */
52  
53 static void generic_id(ide_drive_t *drive)
54 {
55         drive->id->cyls = drive->cyl;
56         drive->id->heads = drive->head;
57         drive->id->sectors = drive->sect;
58         drive->id->cur_cyls = drive->cyl;
59         drive->id->cur_heads = drive->head;
60         drive->id->cur_sectors = drive->sect;
61 }
62
63 static void ide_disk_init_chs(ide_drive_t *drive)
64 {
65         struct hd_driveid *id = drive->id;
66
67         /* Extract geometry if we did not already have one for the drive */
68         if (!drive->cyl || !drive->head || !drive->sect) {
69                 drive->cyl  = drive->bios_cyl  = id->cyls;
70                 drive->head = drive->bios_head = id->heads;
71                 drive->sect = drive->bios_sect = id->sectors;
72         }
73
74         /* Handle logical geometry translation by the drive */
75         if ((id->field_valid & 1) && id->cur_cyls &&
76             id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
77                 drive->cyl  = id->cur_cyls;
78                 drive->head = id->cur_heads;
79                 drive->sect = id->cur_sectors;
80         }
81
82         /* Use physical geometry if what we have still makes no sense */
83         if (drive->head > 16 && id->heads && id->heads <= 16) {
84                 drive->cyl  = id->cyls;
85                 drive->head = id->heads;
86                 drive->sect = id->sectors;
87         }
88 }
89
90 static void ide_disk_init_mult_count(ide_drive_t *drive)
91 {
92         struct hd_driveid *id = drive->id;
93
94         drive->mult_count = 0;
95         if (id->max_multsect) {
96 #ifdef CONFIG_IDEDISK_MULTI_MODE
97                 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
98                 id->multsect_valid = id->multsect ? 1 : 0;
99                 drive->mult_req = id->multsect_valid ? id->max_multsect : 0;
100                 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
101 #else   /* original, pre IDE-NFG, per request of AC */
102                 drive->mult_req = 0;
103                 if (drive->mult_req > id->max_multsect)
104                         drive->mult_req = id->max_multsect;
105                 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
106                         drive->special.b.set_multmode = 1;
107 #endif
108         }
109 }
110
111 /**
112  *      do_identify     -       identify a drive
113  *      @drive: drive to identify 
114  *      @cmd: command used
115  *
116  *      Called when we have issued a drive identify command to
117  *      read and parse the results. This function is run with
118  *      interrupts disabled. 
119  */
120  
121 static inline void do_identify (ide_drive_t *drive, u8 cmd)
122 {
123         ide_hwif_t *hwif = HWIF(drive);
124         int bswap = 1;
125         struct hd_driveid *id;
126
127         id = drive->id;
128         /* read 512 bytes of id info */
129         hwif->input_data(drive, NULL, id, SECTOR_SIZE);
130
131         drive->id_read = 1;
132         local_irq_enable();
133 #ifdef DEBUG
134         printk(KERN_INFO "%s: dumping identify data\n", drive->name);
135         ide_dump_identify((u8 *)id);
136 #endif
137         ide_fix_driveid(id);
138
139 #if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
140         /*
141          * EATA SCSI controllers do a hardware ATA emulation:
142          * Ignore them if there is a driver for them available.
143          */
144         if ((id->model[0] == 'P' && id->model[1] == 'M') ||
145             (id->model[0] == 'S' && id->model[1] == 'K')) {
146                 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
147                 goto err_misc;
148         }
149 #endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
150
151         /*
152          *  WIN_IDENTIFY returns little-endian info,
153          *  WIN_PIDENTIFY *usually* returns little-endian info.
154          */
155         if (cmd == WIN_PIDENTIFY) {
156                 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
157                  || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
158                  || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
159                         /* Vertos drives may still be weird */
160                         bswap ^= 1;     
161         }
162         ide_fixstring(id->model,     sizeof(id->model),     bswap);
163         ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
164         ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
165
166         /* we depend on this a lot! */
167         id->model[sizeof(id->model)-1] = '\0';
168
169         if (strstr(id->model, "E X A B Y T E N E S T"))
170                 goto err_misc;
171
172         printk("%s: %s, ", drive->name, id->model);
173         drive->present = 1;
174         drive->dead = 0;
175
176         /*
177          * Check for an ATAPI device
178          */
179         if (cmd == WIN_PIDENTIFY) {
180                 u8 type = (id->config >> 8) & 0x1f;
181                 printk("ATAPI ");
182                 switch (type) {
183                         case ide_floppy:
184                                 if (!strstr(id->model, "CD-ROM")) {
185                                         if (!strstr(id->model, "oppy") &&
186                                             !strstr(id->model, "poyp") &&
187                                             !strstr(id->model, "ZIP"))
188                                                 printk("cdrom or floppy?, assuming ");
189                                         if (drive->media != ide_cdrom) {
190                                                 printk ("FLOPPY");
191                                                 drive->removable = 1;
192                                                 break;
193                                         }
194                                 }
195                                 /* Early cdrom models used zero */
196                                 type = ide_cdrom;
197                         case ide_cdrom:
198                                 drive->removable = 1;
199 #ifdef CONFIG_PPC
200                                 /* kludge for Apple PowerBook internal zip */
201                                 if (!strstr(id->model, "CD-ROM") &&
202                                     strstr(id->model, "ZIP")) {
203                                         printk ("FLOPPY");
204                                         type = ide_floppy;
205                                         break;
206                                 }
207 #endif
208                                 printk ("CD/DVD-ROM");
209                                 break;
210                         case ide_tape:
211                                 printk ("TAPE");
212                                 break;
213                         case ide_optical:
214                                 printk ("OPTICAL");
215                                 drive->removable = 1;
216                                 break;
217                         default:
218                                 printk("UNKNOWN (type %d)", type);
219                                 break;
220                 }
221                 printk (" drive\n");
222                 drive->media = type;
223                 /* an ATAPI device ignores DRDY */
224                 drive->ready_stat = 0;
225                 return;
226         }
227
228         /*
229          * Not an ATAPI device: looks like a "regular" hard disk
230          */
231
232         /*
233          * 0x848a = CompactFlash device
234          * These are *not* removable in Linux definition of the term
235          */
236
237         if ((id->config != 0x848a) && (id->config & (1<<7)))
238                 drive->removable = 1;
239
240         drive->media = ide_disk;
241         printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
242
243         return;
244
245 err_misc:
246         kfree(id);
247         drive->present = 0;
248         return;
249 }
250
251 /**
252  *      actual_try_to_identify  -       send ata/atapi identify
253  *      @drive: drive to identify
254  *      @cmd: command to use
255  *
256  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
257  *      and waits for a response.  It also monitors irqs while this is
258  *      happening, in hope of automatically determining which one is
259  *      being used by the interface.
260  *
261  *      Returns:        0  device was identified
262  *                      1  device timed-out (no response to identify request)
263  *                      2  device aborted the command (refused to identify itself)
264  */
265
266 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
267 {
268         ide_hwif_t *hwif = HWIF(drive);
269         struct ide_io_ports *io_ports = &hwif->io_ports;
270         int use_altstatus = 0, rc;
271         unsigned long timeout;
272         u8 s = 0, a = 0;
273
274         /* take a deep breath */
275         msleep(50);
276
277         if (io_ports->ctl_addr) {
278                 a = ide_read_altstatus(drive);
279                 s = ide_read_status(drive);
280                 if ((a ^ s) & ~INDEX_STAT)
281                         /* ancient Seagate drives, broken interfaces */
282                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
283                                          "instead of ALTSTATUS(0x%02x)\n",
284                                          drive->name, s, a);
285                 else
286                         /* use non-intrusive polling */
287                         use_altstatus = 1;
288         }
289
290         /* set features register for atapi
291          * identify command to be sure of reply
292          */
293         if ((cmd == WIN_PIDENTIFY))
294                 /* disable dma & overlap */
295                 hwif->OUTB(0, io_ports->feature_addr);
296
297         /* ask drive for ID */
298         hwif->OUTBSYNC(hwif, cmd, hwif->io_ports.command_addr);
299
300         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
301         timeout += jiffies;
302         do {
303                 if (time_after(jiffies, timeout)) {
304                         /* drive timed-out */
305                         return 1;
306                 }
307                 /* give drive a breather */
308                 msleep(50);
309                 s = use_altstatus ? ide_read_altstatus(drive)
310                                   : ide_read_status(drive);
311         } while (s & BUSY_STAT);
312
313         /* wait for IRQ and DRQ_STAT */
314         msleep(50);
315         s = ide_read_status(drive);
316
317         if (OK_STAT(s, DRQ_STAT, BAD_R_STAT)) {
318                 unsigned long flags;
319
320                 /* local CPU only; some systems need this */
321                 local_irq_save(flags);
322                 /* drive returned ID */
323                 do_identify(drive, cmd);
324                 /* drive responded with ID */
325                 rc = 0;
326                 /* clear drive IRQ */
327                 (void)ide_read_status(drive);
328                 local_irq_restore(flags);
329         } else {
330                 /* drive refused ID */
331                 rc = 2;
332         }
333         return rc;
334 }
335
336 /**
337  *      try_to_identify -       try to identify a drive
338  *      @drive: drive to probe
339  *      @cmd: command to use
340  *
341  *      Issue the identify command and then do IRQ probing to
342  *      complete the identification when needed by finding the
343  *      IRQ the drive is attached to
344  */
345  
346 static int try_to_identify (ide_drive_t *drive, u8 cmd)
347 {
348         ide_hwif_t *hwif = HWIF(drive);
349         int retval;
350         int autoprobe = 0;
351         unsigned long cookie = 0;
352
353         /*
354          * Disable device irq unless we need to
355          * probe for it. Otherwise we'll get spurious
356          * interrupts during the identify-phase that
357          * the irq handler isn't expecting.
358          */
359         if (hwif->io_ports.ctl_addr) {
360                 if (!hwif->irq) {
361                         autoprobe = 1;
362                         cookie = probe_irq_on();
363                 }
364                 ide_set_irq(drive, autoprobe);
365         }
366
367         retval = actual_try_to_identify(drive, cmd);
368
369         if (autoprobe) {
370                 int irq;
371
372                 ide_set_irq(drive, 0);
373                 /* clear drive IRQ */
374                 (void)ide_read_status(drive);
375                 udelay(5);
376                 irq = probe_irq_off(cookie);
377                 if (!hwif->irq) {
378                         if (irq > 0) {
379                                 hwif->irq = irq;
380                         } else {
381                                 /* Mmmm.. multiple IRQs..
382                                  * don't know which was ours
383                                  */
384                                 printk("%s: IRQ probe failed (0x%lx)\n",
385                                         drive->name, cookie);
386                         }
387                 }
388         }
389         return retval;
390 }
391
392 static int ide_busy_sleep(ide_hwif_t *hwif)
393 {
394         unsigned long timeout = jiffies + WAIT_WORSTCASE;
395         u8 stat;
396
397         do {
398                 msleep(50);
399                 stat = hwif->INB(hwif->io_ports.status_addr);
400                 if ((stat & BUSY_STAT) == 0)
401                         return 0;
402         } while (time_before(jiffies, timeout));
403
404         return 1;
405 }
406
407 /**
408  *      do_probe                -       probe an IDE device
409  *      @drive: drive to probe
410  *      @cmd: command to use
411  *
412  *      do_probe() has the difficult job of finding a drive if it exists,
413  *      without getting hung up if it doesn't exist, without trampling on
414  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
415  *
416  *      If a drive is "known" to exist (from CMOS or kernel parameters),
417  *      but does not respond right away, the probe will "hang in there"
418  *      for the maximum wait time (about 30 seconds), otherwise it will
419  *      exit much more quickly.
420  *
421  * Returns:     0  device was identified
422  *              1  device timed-out (no response to identify request)
423  *              2  device aborted the command (refused to identify itself)
424  *              3  bad status from device (possible for ATAPI drives)
425  *              4  probe was not attempted because failure was obvious
426  */
427
428 static int do_probe (ide_drive_t *drive, u8 cmd)
429 {
430         ide_hwif_t *hwif = HWIF(drive);
431         struct ide_io_ports *io_ports = &hwif->io_ports;
432         int rc;
433         u8 stat;
434
435         if (drive->present) {
436                 /* avoid waiting for inappropriate probes */
437                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
438                         return 4;
439         }
440 #ifdef DEBUG
441         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
442                 drive->name, drive->present, drive->media,
443                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
444 #endif
445
446         /* needed for some systems
447          * (e.g. crw9624 as drive0 with disk as slave)
448          */
449         msleep(50);
450         SELECT_DRIVE(drive);
451         msleep(50);
452         if (hwif->INB(io_ports->device_addr) != drive->select.all &&
453             !drive->present) {
454                 if (drive->select.b.unit != 0) {
455                         /* exit with drive0 selected */
456                         SELECT_DRIVE(&hwif->drives[0]);
457                         /* allow BUSY_STAT to assert & clear */
458                         msleep(50);
459                 }
460                 /* no i/f present: mmm.. this should be a 4 -ml */
461                 return 3;
462         }
463
464         stat = ide_read_status(drive);
465
466         if (OK_STAT(stat, READY_STAT, BUSY_STAT) ||
467             drive->present || cmd == WIN_PIDENTIFY) {
468                 /* send cmd and wait */
469                 if ((rc = try_to_identify(drive, cmd))) {
470                         /* failed: try again */
471                         rc = try_to_identify(drive,cmd);
472                 }
473
474                 stat = ide_read_status(drive);
475
476                 if (stat == (BUSY_STAT | READY_STAT))
477                         return 4;
478
479                 if (rc == 1 && cmd == WIN_PIDENTIFY) {
480                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
481                                         "resetting drive\n", drive->name, stat);
482                         msleep(50);
483                         SELECT_DRIVE(drive);
484                         msleep(50);
485                         hwif->OUTBSYNC(hwif, WIN_SRST, io_ports->command_addr);
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->OUTBSYNC(hwif, EXABYTE_ENABLE_NEST, hwif->io_ports.command_addr);
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         hwif->portdev = device_create_drvdata(ide_port_class, &hwif->gendev,
652                                               MKDEV(0, 0), hwif, hwif->name);
653         if (IS_ERR(hwif->portdev)) {
654                 ret = PTR_ERR(hwif->portdev);
655                 device_unregister(&hwif->gendev);
656         }
657 out:
658         return ret;
659 }
660
661 /**
662  *      ide_port_wait_ready     -       wait for port to become ready
663  *      @hwif: IDE port
664  *
665  *      This is needed on some PPCs and a bunch of BIOS-less embedded
666  *      platforms.  Typical cases are:
667  *
668  *      - The firmware hard reset the disk before booting the kernel,
669  *        the drive is still doing it's poweron-reset sequence, that
670  *        can take up to 30 seconds.
671  *
672  *      - The firmware does nothing (or no firmware), the device is
673  *        still in POST state (same as above actually).
674  *
675  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
676  *        their reset sequence even when they are non-selected slave
677  *        devices, thus preventing discovery of the main HD.
678  *
679  *      Doing this wait-for-non-busy should not harm any existing
680  *      configuration and fix some issues like the above.
681  *
682  *      BenH.
683  *
684  *      Returns 0 on success, error code (< 0) otherwise.
685  */
686
687 static int ide_port_wait_ready(ide_hwif_t *hwif)
688 {
689         int unit, rc;
690
691         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
692
693         /* Let HW settle down a bit from whatever init state we
694          * come from */
695         mdelay(2);
696
697         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
698          * I know of at least one disk who takes 31 seconds, I use 35
699          * here to be safe
700          */
701         rc = ide_wait_not_busy(hwif, 35000);
702         if (rc)
703                 return rc;
704
705         /* Now make sure both master & slave are ready */
706         for (unit = 0; unit < MAX_DRIVES; unit++) {
707                 ide_drive_t *drive = &hwif->drives[unit];
708
709                 /* Ignore disks that we will not probe for later. */
710                 if (!drive->noprobe || drive->present) {
711                         SELECT_DRIVE(drive);
712                         ide_set_irq(drive, 1);
713                         mdelay(2);
714                         rc = ide_wait_not_busy(hwif, 35000);
715                         if (rc)
716                                 goto out;
717                 } else
718                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
719                                           drive->name);
720         }
721 out:
722         /* Exit function with master reselected (let's be sane) */
723         if (unit)
724                 SELECT_DRIVE(&hwif->drives[0]);
725
726         return rc;
727 }
728
729 /**
730  *      ide_undecoded_slave     -       look for bad CF adapters
731  *      @drive1: drive
732  *
733  *      Analyse the drives on the interface and attempt to decide if we
734  *      have the same drive viewed twice. This occurs with crap CF adapters
735  *      and PCMCIA sometimes.
736  */
737
738 void ide_undecoded_slave(ide_drive_t *drive1)
739 {
740         ide_drive_t *drive0 = &drive1->hwif->drives[0];
741
742         if ((drive1->dn & 1) == 0 || drive0->present == 0)
743                 return;
744
745         /* If the models don't match they are not the same product */
746         if (strcmp(drive0->id->model, drive1->id->model))
747                 return;
748
749         /* Serial numbers do not match */
750         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
751                 return;
752
753         /* No serial number, thankfully very rare for CF */
754         if (drive0->id->serial_no[0] == 0)
755                 return;
756
757         /* Appears to be an IDE flash adapter with decode bugs */
758         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
759
760         drive1->present = 0;
761 }
762
763 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
764
765 static int ide_probe_port(ide_hwif_t *hwif)
766 {
767         unsigned long flags;
768         unsigned int irqd;
769         int unit, rc = -ENODEV;
770
771         BUG_ON(hwif->present);
772
773         if (hwif->drives[0].noprobe && hwif->drives[1].noprobe)
774                 return -EACCES;
775
776         /*
777          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
778          * we'll install our IRQ driver much later...
779          */
780         irqd = hwif->irq;
781         if (irqd)
782                 disable_irq(hwif->irq);
783
784         local_irq_set(flags);
785
786         if (ide_port_wait_ready(hwif) == -EBUSY)
787                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
788
789         /*
790          * Second drive should only exist if first drive was found,
791          * but a lot of cdrom drives are configured as single slaves.
792          */
793         for (unit = 0; unit < MAX_DRIVES; ++unit) {
794                 ide_drive_t *drive = &hwif->drives[unit];
795                 drive->dn = (hwif->channel ? 2 : 0) + unit;
796                 (void) probe_for_drive(drive);
797                 if (drive->present)
798                         rc = 0;
799         }
800
801         local_irq_restore(flags);
802
803         /*
804          * Use cached IRQ number. It might be (and is...) changed by probe
805          * code above
806          */
807         if (irqd)
808                 enable_irq(irqd);
809
810         return rc;
811 }
812
813 static void ide_port_tune_devices(ide_hwif_t *hwif)
814 {
815         const struct ide_port_ops *port_ops = hwif->port_ops;
816         int unit;
817
818         for (unit = 0; unit < MAX_DRIVES; unit++) {
819                 ide_drive_t *drive = &hwif->drives[unit];
820
821                 if (drive->present && port_ops && port_ops->quirkproc)
822                         port_ops->quirkproc(drive);
823         }
824
825         for (unit = 0; unit < MAX_DRIVES; ++unit) {
826                 ide_drive_t *drive = &hwif->drives[unit];
827
828                 if (drive->present) {
829                         ide_set_max_pio(drive);
830
831                         drive->nice1 = 1;
832
833                         if (hwif->dma_ops)
834                                 ide_set_dma(drive);
835                 }
836         }
837
838         for (unit = 0; unit < MAX_DRIVES; ++unit) {
839                 ide_drive_t *drive = &hwif->drives[unit];
840
841                 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
842                         drive->no_io_32bit = 1;
843                 else
844                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
845         }
846 }
847
848 #if MAX_HWIFS > 1
849 /*
850  * save_match() is used to simplify logic in init_irq() below.
851  *
852  * A loophole here is that we may not know about a particular
853  * hwif's irq until after that hwif is actually probed/initialized..
854  * This could be a problem for the case where an hwif is on a
855  * dual interface that requires serialization (eg. cmd640) and another
856  * hwif using one of the same irqs is initialized beforehand.
857  *
858  * This routine detects and reports such situations, but does not fix them.
859  */
860 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
861 {
862         ide_hwif_t *m = *match;
863
864         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
865                 if (!new->hwgroup)
866                         return;
867                 printk("%s: potential irq problem with %s and %s\n",
868                         hwif->name, new->name, m->name);
869         }
870         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
871                 *match = new;
872 }
873 #endif /* MAX_HWIFS > 1 */
874
875 /*
876  * init request queue
877  */
878 static int ide_init_queue(ide_drive_t *drive)
879 {
880         struct request_queue *q;
881         ide_hwif_t *hwif = HWIF(drive);
882         int max_sectors = 256;
883         int max_sg_entries = PRD_ENTRIES;
884
885         /*
886          *      Our default set up assumes the normal IDE case,
887          *      that is 64K segmenting, standard PRD setup
888          *      and LBA28. Some drivers then impose their own
889          *      limits and LBA48 we could raise it but as yet
890          *      do not.
891          */
892
893         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
894         if (!q)
895                 return 1;
896
897         q->queuedata = drive;
898         blk_queue_segment_boundary(q, 0xffff);
899
900         if (hwif->rqsize < max_sectors)
901                 max_sectors = hwif->rqsize;
902         blk_queue_max_sectors(q, max_sectors);
903
904 #ifdef CONFIG_PCI
905         /* When we have an IOMMU, we may have a problem where pci_map_sg()
906          * creates segments that don't completely match our boundary
907          * requirements and thus need to be broken up again. Because it
908          * doesn't align properly either, we may actually have to break up
909          * to more segments than what was we got in the first place, a max
910          * worst case is twice as many.
911          * This will be fixed once we teach pci_map_sg() about our boundary
912          * requirements, hopefully soon. *FIXME*
913          */
914         if (!PCI_DMA_BUS_IS_PHYS)
915                 max_sg_entries >>= 1;
916 #endif /* CONFIG_PCI */
917
918         blk_queue_max_hw_segments(q, max_sg_entries);
919         blk_queue_max_phys_segments(q, max_sg_entries);
920
921         /* assign drive queue */
922         drive->queue = q;
923
924         /* needs drive->queue to be set */
925         ide_toggle_bounce(drive, 1);
926
927         return 0;
928 }
929
930 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
931 {
932         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
933
934         spin_lock_irq(&ide_lock);
935         if (!hwgroup->drive) {
936                 /* first drive for hwgroup. */
937                 drive->next = drive;
938                 hwgroup->drive = drive;
939                 hwgroup->hwif = HWIF(hwgroup->drive);
940         } else {
941                 drive->next = hwgroup->drive->next;
942                 hwgroup->drive->next = drive;
943         }
944         spin_unlock_irq(&ide_lock);
945 }
946
947 /*
948  * For any present drive:
949  * - allocate the block device queue
950  * - link drive into the hwgroup
951  */
952 static void ide_port_setup_devices(ide_hwif_t *hwif)
953 {
954         int i;
955
956         mutex_lock(&ide_cfg_mtx);
957         for (i = 0; i < MAX_DRIVES; i++) {
958                 ide_drive_t *drive = &hwif->drives[i];
959
960                 if (!drive->present)
961                         continue;
962
963                 if (ide_init_queue(drive)) {
964                         printk(KERN_ERR "ide: failed to init %s\n",
965                                         drive->name);
966                         continue;
967                 }
968
969                 ide_add_drive_to_hwgroup(drive);
970         }
971         mutex_unlock(&ide_cfg_mtx);
972 }
973
974 /*
975  * This routine sets up the irq for an ide interface, and creates a new
976  * hwgroup for the irq/hwif if none was previously assigned.
977  *
978  * Much of the code is for correctly detecting/handling irq sharing
979  * and irq serialization situations.  This is somewhat complex because
980  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
981  */
982 static int init_irq (ide_hwif_t *hwif)
983 {
984         struct ide_io_ports *io_ports = &hwif->io_ports;
985         unsigned int index;
986         ide_hwgroup_t *hwgroup;
987         ide_hwif_t *match = NULL;
988
989
990         BUG_ON(in_interrupt());
991         BUG_ON(irqs_disabled());        
992         BUG_ON(hwif == NULL);
993
994         mutex_lock(&ide_cfg_mtx);
995         hwif->hwgroup = NULL;
996 #if MAX_HWIFS > 1
997         /*
998          * Group up with any other hwifs that share our irq(s).
999          */
1000         for (index = 0; index < MAX_HWIFS; index++) {
1001                 ide_hwif_t *h = &ide_hwifs[index];
1002                 if (h->hwgroup) {  /* scan only initialized hwif's */
1003                         if (hwif->irq == h->irq) {
1004                                 hwif->sharing_irq = h->sharing_irq = 1;
1005                                 if (hwif->chipset != ide_pci ||
1006                                     h->chipset != ide_pci) {
1007                                         save_match(hwif, h, &match);
1008                                 }
1009                         }
1010                         if (hwif->serialized) {
1011                                 if (hwif->mate && hwif->mate->irq == h->irq)
1012                                         save_match(hwif, h, &match);
1013                         }
1014                         if (h->serialized) {
1015                                 if (h->mate && hwif->irq == h->mate->irq)
1016                                         save_match(hwif, h, &match);
1017                         }
1018                 }
1019         }
1020 #endif /* MAX_HWIFS > 1 */
1021         /*
1022          * If we are still without a hwgroup, then form a new one
1023          */
1024         if (match) {
1025                 hwgroup = match->hwgroup;
1026                 hwif->hwgroup = hwgroup;
1027                 /*
1028                  * Link us into the hwgroup.
1029                  * This must be done early, do ensure that unexpected_intr
1030                  * can find the hwif and prevent irq storms.
1031                  * No drives are attached to the new hwif, choose_drive
1032                  * can't do anything stupid (yet).
1033                  * Add ourself as the 2nd entry to the hwgroup->hwif
1034                  * linked list, the first entry is the hwif that owns
1035                  * hwgroup->handler - do not change that.
1036                  */
1037                 spin_lock_irq(&ide_lock);
1038                 hwif->next = hwgroup->hwif->next;
1039                 hwgroup->hwif->next = hwif;
1040                 BUG_ON(hwif->next == hwif);
1041                 spin_unlock_irq(&ide_lock);
1042         } else {
1043                 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1044                                        hwif_to_node(hwif));
1045                 if (hwgroup == NULL)
1046                         goto out_up;
1047
1048                 hwif->hwgroup = hwgroup;
1049                 hwgroup->hwif = hwif->next = hwif;
1050
1051                 init_timer(&hwgroup->timer);
1052                 hwgroup->timer.function = &ide_timer_expiry;
1053                 hwgroup->timer.data = (unsigned long) hwgroup;
1054         }
1055
1056         /*
1057          * Allocate the irq, if not already obtained for another hwif
1058          */
1059         if (!match || match->irq != hwif->irq) {
1060                 int sa = 0;
1061 #if defined(__mc68000__)
1062                 sa = IRQF_SHARED;
1063 #endif /* __mc68000__ */
1064
1065                 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1066                         sa = IRQF_SHARED;
1067
1068                 if (io_ports->ctl_addr)
1069                         /* clear nIEN */
1070                         hwif->OUTBSYNC(hwif, ATA_DEVCTL_OBS, io_ports->ctl_addr);
1071
1072                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1073                         goto out_unlink;
1074         }
1075
1076         if (!hwif->rqsize) {
1077                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1078                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1079                         hwif->rqsize = 256;
1080                 else
1081                         hwif->rqsize = 65536;
1082         }
1083
1084 #if !defined(__mc68000__)
1085         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1086                 io_ports->data_addr, io_ports->status_addr,
1087                 io_ports->ctl_addr, hwif->irq);
1088 #else
1089         printk("%s at 0x%08lx on irq %d", hwif->name,
1090                 io_ports->data_addr, hwif->irq);
1091 #endif /* __mc68000__ */
1092         if (match)
1093                 printk(" (%sed with %s)",
1094                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1095         printk("\n");
1096
1097         mutex_unlock(&ide_cfg_mtx);
1098         return 0;
1099 out_unlink:
1100         ide_remove_port_from_hwgroup(hwif);
1101 out_up:
1102         mutex_unlock(&ide_cfg_mtx);
1103         return 1;
1104 }
1105
1106 static int ata_lock(dev_t dev, void *data)
1107 {
1108         /* FIXME: we want to pin hwif down */
1109         return 0;
1110 }
1111
1112 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1113 {
1114         ide_hwif_t *hwif = data;
1115         int unit = *part >> PARTN_BITS;
1116         ide_drive_t *drive = &hwif->drives[unit];
1117         if (!drive->present)
1118                 return NULL;
1119
1120         if (drive->media == ide_disk)
1121                 request_module("ide-disk");
1122         if (drive->scsi)
1123                 request_module("ide-scsi");
1124         if (drive->media == ide_cdrom || drive->media == ide_optical)
1125                 request_module("ide-cd");
1126         if (drive->media == ide_tape)
1127                 request_module("ide-tape");
1128         if (drive->media == ide_floppy)
1129                 request_module("ide-floppy");
1130
1131         return NULL;
1132 }
1133
1134 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1135 {
1136         struct gendisk *p = data;
1137         *part &= (1 << PARTN_BITS) - 1;
1138         return &p->dev.kobj;
1139 }
1140
1141 static int exact_lock(dev_t dev, void *data)
1142 {
1143         struct gendisk *p = data;
1144
1145         if (!get_disk(p))
1146                 return -1;
1147         return 0;
1148 }
1149
1150 void ide_register_region(struct gendisk *disk)
1151 {
1152         blk_register_region(MKDEV(disk->major, disk->first_minor),
1153                             disk->minors, NULL, exact_match, exact_lock, disk);
1154 }
1155
1156 EXPORT_SYMBOL_GPL(ide_register_region);
1157
1158 void ide_unregister_region(struct gendisk *disk)
1159 {
1160         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1161                               disk->minors);
1162 }
1163
1164 EXPORT_SYMBOL_GPL(ide_unregister_region);
1165
1166 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1167 {
1168         ide_hwif_t *hwif = drive->hwif;
1169         unsigned int unit = (drive->select.all >> 4) & 1;
1170
1171         disk->major = hwif->major;
1172         disk->first_minor = unit << PARTN_BITS;
1173         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1174         disk->queue = drive->queue;
1175 }
1176
1177 EXPORT_SYMBOL_GPL(ide_init_disk);
1178
1179 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1180 {
1181         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1182
1183         if (drive == drive->next) {
1184                 /* special case: last drive from hwgroup. */
1185                 BUG_ON(hwgroup->drive != drive);
1186                 hwgroup->drive = NULL;
1187         } else {
1188                 ide_drive_t *walk;
1189
1190                 walk = hwgroup->drive;
1191                 while (walk->next != drive)
1192                         walk = walk->next;
1193                 walk->next = drive->next;
1194                 if (hwgroup->drive == drive) {
1195                         hwgroup->drive = drive->next;
1196                         hwgroup->hwif = hwgroup->drive->hwif;
1197                 }
1198         }
1199         BUG_ON(hwgroup->drive == drive);
1200 }
1201
1202 static void drive_release_dev (struct device *dev)
1203 {
1204         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1205
1206         ide_proc_unregister_device(drive);
1207
1208         spin_lock_irq(&ide_lock);
1209         ide_remove_drive_from_hwgroup(drive);
1210         kfree(drive->id);
1211         drive->id = NULL;
1212         drive->present = 0;
1213         /* Messed up locking ... */
1214         spin_unlock_irq(&ide_lock);
1215         blk_cleanup_queue(drive->queue);
1216         spin_lock_irq(&ide_lock);
1217         drive->queue = NULL;
1218         spin_unlock_irq(&ide_lock);
1219
1220         complete(&drive->gendev_rel_comp);
1221 }
1222
1223 static int hwif_init(ide_hwif_t *hwif)
1224 {
1225         int old_irq;
1226
1227         if (!hwif->irq) {
1228                 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1229                 if (!hwif->irq) {
1230                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1231                         return 0;
1232                 }
1233         }
1234
1235         if (register_blkdev(hwif->major, hwif->name))
1236                 return 0;
1237
1238         if (!hwif->sg_max_nents)
1239                 hwif->sg_max_nents = PRD_ENTRIES;
1240
1241         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1242                                  GFP_KERNEL);
1243         if (!hwif->sg_table) {
1244                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1245                 goto out;
1246         }
1247
1248         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1249         
1250         if (init_irq(hwif) == 0)
1251                 goto done;
1252
1253         old_irq = hwif->irq;
1254         /*
1255          *      It failed to initialise. Find the default IRQ for 
1256          *      this port and try that.
1257          */
1258         hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1259         if (!hwif->irq) {
1260                 printk("%s: Disabled unable to get IRQ %d.\n",
1261                         hwif->name, old_irq);
1262                 goto out;
1263         }
1264         if (init_irq(hwif)) {
1265                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1266                         hwif->name, old_irq, hwif->irq);
1267                 goto out;
1268         }
1269         printk("%s: probed IRQ %d failed, using default.\n",
1270                 hwif->name, hwif->irq);
1271
1272 done:
1273         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1274                             THIS_MODULE, ata_probe, ata_lock, hwif);
1275         return 1;
1276
1277 out:
1278         unregister_blkdev(hwif->major, hwif->name);
1279         return 0;
1280 }
1281
1282 static void hwif_register_devices(ide_hwif_t *hwif)
1283 {
1284         unsigned int i;
1285
1286         for (i = 0; i < MAX_DRIVES; i++) {
1287                 ide_drive_t *drive = &hwif->drives[i];
1288                 struct device *dev = &drive->gendev;
1289                 int ret;
1290
1291                 if (!drive->present)
1292                         continue;
1293
1294                 ide_add_generic_settings(drive);
1295
1296                 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1297                 dev->parent = &hwif->gendev;
1298                 dev->bus = &ide_bus_type;
1299                 dev->driver_data = drive;
1300                 dev->release = drive_release_dev;
1301
1302                 ret = device_register(dev);
1303                 if (ret < 0)
1304                         printk(KERN_WARNING "IDE: %s: device_register error: "
1305                                             "%d\n", __func__, ret);
1306         }
1307 }
1308
1309 static void ide_port_init_devices(ide_hwif_t *hwif)
1310 {
1311         const struct ide_port_ops *port_ops = hwif->port_ops;
1312         int i;
1313
1314         for (i = 0; i < MAX_DRIVES; i++) {
1315                 ide_drive_t *drive = &hwif->drives[i];
1316
1317                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1318                         drive->io_32bit = 1;
1319                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1320                         drive->unmask = 1;
1321                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1322                         drive->no_unmask = 1;
1323         }
1324
1325         if (port_ops && port_ops->port_init_devs)
1326                 port_ops->port_init_devs(hwif);
1327 }
1328
1329 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1330                           const struct ide_port_info *d)
1331 {
1332         hwif->channel = port;
1333
1334         if (d->chipset)
1335                 hwif->chipset = d->chipset;
1336
1337         if (d->init_iops)
1338                 d->init_iops(hwif);
1339
1340         if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1341             (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1342                 hwif->irq = port ? 15 : 14;
1343
1344         /* ->host_flags may be set by ->init_iops (or even earlier...) */
1345         hwif->host_flags |= d->host_flags;
1346         hwif->pio_mask = d->pio_mask;
1347
1348         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1349         if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1350                 hwif->port_ops = d->port_ops;
1351
1352         hwif->swdma_mask = d->swdma_mask;
1353         hwif->mwdma_mask = d->mwdma_mask;
1354         hwif->ultra_mask = d->udma_mask;
1355
1356         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1357                 int rc;
1358
1359                 if (d->init_dma)
1360                         rc = d->init_dma(hwif, d);
1361                 else
1362                         rc = ide_hwif_setup_dma(hwif, d);
1363
1364                 if (rc < 0) {
1365                         printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1366                         hwif->swdma_mask = 0;
1367                         hwif->mwdma_mask = 0;
1368                         hwif->ultra_mask = 0;
1369                 } else if (d->dma_ops)
1370                         hwif->dma_ops = d->dma_ops;
1371         }
1372
1373         if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1374             ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1375                 if (hwif->mate)
1376                         hwif->mate->serialized = hwif->serialized = 1;
1377         }
1378
1379         if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1380                 hwif->rqsize = 256;
1381
1382         /* call chipset specific routine for each enabled port */
1383         if (d->init_hwif)
1384                 d->init_hwif(hwif);
1385 }
1386
1387 static void ide_port_cable_detect(ide_hwif_t *hwif)
1388 {
1389         const struct ide_port_ops *port_ops = hwif->port_ops;
1390
1391         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1392                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1393                         hwif->cbl = port_ops->cable_detect(hwif);
1394         }
1395 }
1396
1397 static ssize_t store_delete_devices(struct device *portdev,
1398                                     struct device_attribute *attr,
1399                                     const char *buf, size_t n)
1400 {
1401         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1402
1403         if (strncmp(buf, "1", n))
1404                 return -EINVAL;
1405
1406         ide_port_unregister_devices(hwif);
1407
1408         return n;
1409 };
1410
1411 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1412
1413 static ssize_t store_scan(struct device *portdev,
1414                           struct device_attribute *attr,
1415                           const char *buf, size_t n)
1416 {
1417         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1418
1419         if (strncmp(buf, "1", n))
1420                 return -EINVAL;
1421
1422         ide_port_unregister_devices(hwif);
1423         ide_port_scan(hwif);
1424
1425         return n;
1426 };
1427
1428 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1429
1430 static struct device_attribute *ide_port_attrs[] = {
1431         &dev_attr_delete_devices,
1432         &dev_attr_scan,
1433         NULL
1434 };
1435
1436 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1437 {
1438         int i, rc;
1439
1440         for (i = 0; ide_port_attrs[i]; i++) {
1441                 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1442                 if (rc)
1443                         break;
1444         }
1445
1446         return rc;
1447 }
1448
1449 /**
1450  *      ide_find_port_slot      -       find free ide_hwifs[] slot
1451  *      @d: IDE port info
1452  *
1453  *      Return the new hwif.  If we are out of free slots return NULL.
1454  */
1455
1456 ide_hwif_t *ide_find_port_slot(const struct ide_port_info *d)
1457 {
1458         ide_hwif_t *hwif;
1459         int i;
1460         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1461
1462         /*
1463          * Claim an unassigned slot.
1464          *
1465          * Give preference to claiming other slots before claiming ide0/ide1,
1466          * just in case there's another interface yet-to-be-scanned
1467          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1468          *
1469          * Unless there is a bootable card that does not use the standard
1470          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1471          */
1472         if (bootable) {
1473                 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;
1474
1475                 for (; i < MAX_HWIFS; i++) {
1476                         hwif = &ide_hwifs[i];
1477                         if (hwif->chipset == ide_unknown)
1478                                 goto out_found;
1479                 }
1480         } else {
1481                 for (i = 2; i < MAX_HWIFS; i++) {
1482                         hwif = &ide_hwifs[i];
1483                         if (hwif->chipset == ide_unknown)
1484                                 goto out_found;
1485                 }
1486                 for (i = 0; i < 2 && i < MAX_HWIFS; i++) {
1487                         hwif = &ide_hwifs[i];
1488                         if (hwif->chipset == ide_unknown)
1489                                 goto out_found;
1490                 }
1491         }
1492
1493         return NULL;
1494
1495 out_found:
1496         ide_init_port_data(hwif, i);
1497         return hwif;
1498 }
1499 EXPORT_SYMBOL_GPL(ide_find_port_slot);
1500
1501 int ide_device_add_all(u8 *idx, const struct ide_port_info *d)
1502 {
1503         ide_hwif_t *hwif, *mate = NULL;
1504         int i, rc = 0;
1505
1506         for (i = 0; i < MAX_HWIFS; i++) {
1507                 if (idx[i] == 0xff) {
1508                         mate = NULL;
1509                         continue;
1510                 }
1511
1512                 hwif = &ide_hwifs[idx[i]];
1513
1514                 ide_port_apply_params(hwif);
1515
1516                 if (d == NULL) {
1517                         mate = NULL;
1518                         continue;
1519                 }
1520
1521                 if ((i & 1) && mate) {
1522                         hwif->mate = mate;
1523                         mate->mate = hwif;
1524                 }
1525
1526                 mate = (i & 1) ? NULL : hwif;
1527
1528                 ide_init_port(hwif, i & 1, d);
1529                 ide_port_cable_detect(hwif);
1530                 ide_port_init_devices(hwif);
1531         }
1532
1533         for (i = 0; i < MAX_HWIFS; i++) {
1534                 if (idx[i] == 0xff)
1535                         continue;
1536
1537                 hwif = &ide_hwifs[idx[i]];
1538
1539                 if (ide_probe_port(hwif) == 0)
1540                         hwif->present = 1;
1541
1542                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1543                     !hwif->mate->present)
1544                         ide_register_port(hwif);
1545
1546                 if (hwif->present)
1547                         ide_port_tune_devices(hwif);
1548         }
1549
1550         for (i = 0; i < MAX_HWIFS; i++) {
1551                 if (idx[i] == 0xff)
1552                         continue;
1553
1554                 hwif = &ide_hwifs[idx[i]];
1555
1556                 if (hwif_init(hwif) == 0) {
1557                         printk(KERN_INFO "%s: failed to initialize IDE "
1558                                          "interface\n", hwif->name);
1559                         hwif->present = 0;
1560                         rc = -1;
1561                         continue;
1562                 }
1563
1564                 if (hwif->present)
1565                         ide_port_setup_devices(hwif);
1566
1567                 ide_acpi_init(hwif);
1568
1569                 if (hwif->present)
1570                         ide_acpi_port_init_devices(hwif);
1571         }
1572
1573         for (i = 0; i < MAX_HWIFS; i++) {
1574                 if (idx[i] == 0xff)
1575                         continue;
1576
1577                 hwif = &ide_hwifs[idx[i]];
1578
1579                 if (hwif->chipset == ide_unknown)
1580                         hwif->chipset = ide_generic;
1581
1582                 if (hwif->present)
1583                         hwif_register_devices(hwif);
1584         }
1585
1586         for (i = 0; i < MAX_HWIFS; i++) {
1587                 if (idx[i] == 0xff)
1588                         continue;
1589
1590                 hwif = &ide_hwifs[idx[i]];
1591
1592                 ide_sysfs_register_port(hwif);
1593                 ide_proc_register_port(hwif);
1594
1595                 if (hwif->present)
1596                         ide_proc_port_register_devices(hwif);
1597         }
1598
1599         return rc;
1600 }
1601 EXPORT_SYMBOL_GPL(ide_device_add_all);
1602
1603 int ide_device_add(u8 idx[4], const struct ide_port_info *d)
1604 {
1605         u8 idx_all[MAX_HWIFS];
1606         int i;
1607
1608         for (i = 0; i < MAX_HWIFS; i++)
1609                 idx_all[i] = (i < 4) ? idx[i] : 0xff;
1610
1611         return ide_device_add_all(idx_all, d);
1612 }
1613 EXPORT_SYMBOL_GPL(ide_device_add);
1614
1615 void ide_port_scan(ide_hwif_t *hwif)
1616 {
1617         ide_port_apply_params(hwif);
1618         ide_port_cable_detect(hwif);
1619         ide_port_init_devices(hwif);
1620
1621         if (ide_probe_port(hwif) < 0)
1622                 return;
1623
1624         hwif->present = 1;
1625
1626         ide_port_tune_devices(hwif);
1627         ide_acpi_port_init_devices(hwif);
1628         ide_port_setup_devices(hwif);
1629         hwif_register_devices(hwif);
1630         ide_proc_port_register_devices(hwif);
1631 }
1632 EXPORT_SYMBOL_GPL(ide_port_scan);
1633
1634 static void ide_legacy_init_one(u8 *idx, hw_regs_t *hw, u8 port_no,
1635                                 const struct ide_port_info *d,
1636                                 unsigned long config)
1637 {
1638         ide_hwif_t *hwif;
1639         unsigned long base, ctl;
1640         int irq;
1641
1642         if (port_no == 0) {
1643                 base = 0x1f0;
1644                 ctl  = 0x3f6;
1645                 irq  = 14;
1646         } else {
1647                 base = 0x170;
1648                 ctl  = 0x376;
1649                 irq  = 15;
1650         }
1651
1652         if (!request_region(base, 8, d->name)) {
1653                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1654                                 d->name, base, base + 7);
1655                 return;
1656         }
1657
1658         if (!request_region(ctl, 1, d->name)) {
1659                 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1660                                 d->name, ctl);
1661                 release_region(base, 8);
1662                 return;
1663         }
1664
1665         ide_std_init_ports(hw, base, ctl);
1666         hw->irq = irq;
1667         hw->chipset = d->chipset;
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);