ide: add ide_pci_remove() helper
[linux-2.6.git] / drivers / ide / ide-probe.c
1 /*
2  *  Copyright (C) 1994-1998   Linus Torvalds & authors (see below)
3  *  Copyright (C) 2005, 2007  Bartlomiej Zolnierkiewicz
4  */
5
6 /*
7  *  Mostly written by Mark Lord <mlord@pobox.com>
8  *                and Gadi Oxman <gadio@netvision.net.il>
9  *                and Andre Hedrick <andre@linux-ide.org>
10  *
11  *  See linux/MAINTAINERS for address of current maintainer.
12  *
13  * This is the IDE probe module, as evolved from hd.c and ide.c.
14  *
15  * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
16  *       by Andrea Arcangeli
17  */
18
19 #include <linux/module.h>
20 #include <linux/types.h>
21 #include <linux/string.h>
22 #include <linux/kernel.h>
23 #include <linux/timer.h>
24 #include <linux/mm.h>
25 #include <linux/interrupt.h>
26 #include <linux/major.h>
27 #include <linux/errno.h>
28 #include <linux/genhd.h>
29 #include <linux/slab.h>
30 #include <linux/delay.h>
31 #include <linux/ide.h>
32 #include <linux/spinlock.h>
33 #include <linux/kmod.h>
34 #include <linux/pci.h>
35 #include <linux/scatterlist.h>
36
37 #include <asm/byteorder.h>
38 #include <asm/irq.h>
39 #include <asm/uaccess.h>
40 #include <asm/io.h>
41
42 /**
43  *      generic_id              -       add a generic drive id
44  *      @drive: drive to make an ID block for
45  *      
46  *      Add a fake id field to the drive we are passed. This allows
47  *      use to skip a ton of NULL checks (which people always miss) 
48  *      and make drive properties unconditional outside of this file
49  */
50  
51 static void generic_id(ide_drive_t *drive)
52 {
53         drive->id->cyls = drive->cyl;
54         drive->id->heads = drive->head;
55         drive->id->sectors = drive->sect;
56         drive->id->cur_cyls = drive->cyl;
57         drive->id->cur_heads = drive->head;
58         drive->id->cur_sectors = drive->sect;
59 }
60
61 static void ide_disk_init_chs(ide_drive_t *drive)
62 {
63         struct hd_driveid *id = drive->id;
64
65         /* Extract geometry if we did not already have one for the drive */
66         if (!drive->cyl || !drive->head || !drive->sect) {
67                 drive->cyl  = drive->bios_cyl  = id->cyls;
68                 drive->head = drive->bios_head = id->heads;
69                 drive->sect = drive->bios_sect = id->sectors;
70         }
71
72         /* Handle logical geometry translation by the drive */
73         if ((id->field_valid & 1) && id->cur_cyls &&
74             id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
75                 drive->cyl  = id->cur_cyls;
76                 drive->head = id->cur_heads;
77                 drive->sect = id->cur_sectors;
78         }
79
80         /* Use physical geometry if what we have still makes no sense */
81         if (drive->head > 16 && id->heads && id->heads <= 16) {
82                 drive->cyl  = id->cyls;
83                 drive->head = id->heads;
84                 drive->sect = id->sectors;
85         }
86 }
87
88 static void ide_disk_init_mult_count(ide_drive_t *drive)
89 {
90         struct hd_driveid *id = drive->id;
91
92         drive->mult_count = 0;
93         if (id->max_multsect) {
94 #ifdef CONFIG_IDEDISK_MULTI_MODE
95                 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
96                 id->multsect_valid = id->multsect ? 1 : 0;
97                 drive->mult_req = id->multsect_valid ? id->max_multsect : 0;
98                 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
99 #else   /* original, pre IDE-NFG, per request of AC */
100                 drive->mult_req = 0;
101                 if (drive->mult_req > id->max_multsect)
102                         drive->mult_req = id->max_multsect;
103                 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
104                         drive->special.b.set_multmode = 1;
105 #endif
106         }
107 }
108
109 /**
110  *      do_identify     -       identify a drive
111  *      @drive: drive to identify 
112  *      @cmd: command used
113  *
114  *      Called when we have issued a drive identify command to
115  *      read and parse the results. This function is run with
116  *      interrupts disabled. 
117  */
118  
119 static inline void do_identify (ide_drive_t *drive, u8 cmd)
120 {
121         ide_hwif_t *hwif = HWIF(drive);
122         int bswap = 1;
123         struct hd_driveid *id;
124
125         id = drive->id;
126         /* read 512 bytes of id info */
127         hwif->tp_ops->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         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
269         int use_altstatus = 0, rc;
270         unsigned long timeout;
271         u8 s = 0, a = 0;
272
273         /* take a deep breath */
274         msleep(50);
275
276         if (io_ports->ctl_addr) {
277                 a = tp_ops->read_altstatus(hwif);
278                 s = tp_ops->read_status(hwif);
279                 if ((a ^ s) & ~INDEX_STAT)
280                         /* ancient Seagate drives, broken interfaces */
281                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
282                                          "instead of ALTSTATUS(0x%02x)\n",
283                                          drive->name, s, a);
284                 else
285                         /* use non-intrusive polling */
286                         use_altstatus = 1;
287         }
288
289         /* set features register for atapi
290          * identify command to be sure of reply
291          */
292         if (cmd == WIN_PIDENTIFY) {
293                 ide_task_t task;
294
295                 memset(&task, 0, sizeof(task));
296                 /* disable DMA & overlap */
297                 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
298
299                 tp_ops->tf_load(drive, &task);
300         }
301
302         /* ask drive for ID */
303         tp_ops->exec_command(hwif, cmd);
304
305         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
306         timeout += jiffies;
307         do {
308                 if (time_after(jiffies, timeout)) {
309                         /* drive timed-out */
310                         return 1;
311                 }
312                 /* give drive a breather */
313                 msleep(50);
314                 s = use_altstatus ? tp_ops->read_altstatus(hwif)
315                                   : tp_ops->read_status(hwif);
316         } while (s & BUSY_STAT);
317
318         /* wait for IRQ and DRQ_STAT */
319         msleep(50);
320         s = tp_ops->read_status(hwif);
321
322         if (OK_STAT(s, DRQ_STAT, BAD_R_STAT)) {
323                 unsigned long flags;
324
325                 /* local CPU only; some systems need this */
326                 local_irq_save(flags);
327                 /* drive returned ID */
328                 do_identify(drive, cmd);
329                 /* drive responded with ID */
330                 rc = 0;
331                 /* clear drive IRQ */
332                 (void)tp_ops->read_status(hwif);
333                 local_irq_restore(flags);
334         } else {
335                 /* drive refused ID */
336                 rc = 2;
337         }
338         return rc;
339 }
340
341 /**
342  *      try_to_identify -       try to identify a drive
343  *      @drive: drive to probe
344  *      @cmd: command to use
345  *
346  *      Issue the identify command and then do IRQ probing to
347  *      complete the identification when needed by finding the
348  *      IRQ the drive is attached to
349  */
350  
351 static int try_to_identify (ide_drive_t *drive, u8 cmd)
352 {
353         ide_hwif_t *hwif = HWIF(drive);
354         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
355         int retval;
356         int autoprobe = 0;
357         unsigned long cookie = 0;
358
359         /*
360          * Disable device irq unless we need to
361          * probe for it. Otherwise we'll get spurious
362          * interrupts during the identify-phase that
363          * the irq handler isn't expecting.
364          */
365         if (hwif->io_ports.ctl_addr) {
366                 if (!hwif->irq) {
367                         autoprobe = 1;
368                         cookie = probe_irq_on();
369                 }
370                 tp_ops->set_irq(hwif, autoprobe);
371         }
372
373         retval = actual_try_to_identify(drive, cmd);
374
375         if (autoprobe) {
376                 int irq;
377
378                 tp_ops->set_irq(hwif, 0);
379                 /* clear drive IRQ */
380                 (void)tp_ops->read_status(hwif);
381                 udelay(5);
382                 irq = probe_irq_off(cookie);
383                 if (!hwif->irq) {
384                         if (irq > 0) {
385                                 hwif->irq = irq;
386                         } else {
387                                 /* Mmmm.. multiple IRQs..
388                                  * don't know which was ours
389                                  */
390                                 printk("%s: IRQ probe failed (0x%lx)\n",
391                                         drive->name, cookie);
392                         }
393                 }
394         }
395         return retval;
396 }
397
398 static int ide_busy_sleep(ide_hwif_t *hwif)
399 {
400         unsigned long timeout = jiffies + WAIT_WORSTCASE;
401         u8 stat;
402
403         do {
404                 msleep(50);
405                 stat = hwif->tp_ops->read_status(hwif);
406                 if ((stat & BUSY_STAT) == 0)
407                         return 0;
408         } while (time_before(jiffies, timeout));
409
410         return 1;
411 }
412
413 static u8 ide_read_device(ide_drive_t *drive)
414 {
415         ide_task_t task;
416
417         memset(&task, 0, sizeof(task));
418         task.tf_flags = IDE_TFLAG_IN_DEVICE;
419
420         drive->hwif->tp_ops->tf_read(drive, &task);
421
422         return task.tf.device;
423 }
424
425 /**
426  *      do_probe                -       probe an IDE device
427  *      @drive: drive to probe
428  *      @cmd: command to use
429  *
430  *      do_probe() has the difficult job of finding a drive if it exists,
431  *      without getting hung up if it doesn't exist, without trampling on
432  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
433  *
434  *      If a drive is "known" to exist (from CMOS or kernel parameters),
435  *      but does not respond right away, the probe will "hang in there"
436  *      for the maximum wait time (about 30 seconds), otherwise it will
437  *      exit much more quickly.
438  *
439  * Returns:     0  device was identified
440  *              1  device timed-out (no response to identify request)
441  *              2  device aborted the command (refused to identify itself)
442  *              3  bad status from device (possible for ATAPI drives)
443  *              4  probe was not attempted because failure was obvious
444  */
445
446 static int do_probe (ide_drive_t *drive, u8 cmd)
447 {
448         ide_hwif_t *hwif = HWIF(drive);
449         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
450         int rc;
451         u8 stat;
452
453         if (drive->present) {
454                 /* avoid waiting for inappropriate probes */
455                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
456                         return 4;
457         }
458 #ifdef DEBUG
459         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
460                 drive->name, drive->present, drive->media,
461                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
462 #endif
463
464         /* needed for some systems
465          * (e.g. crw9624 as drive0 with disk as slave)
466          */
467         msleep(50);
468         SELECT_DRIVE(drive);
469         msleep(50);
470
471         if (ide_read_device(drive) != drive->select.all && !drive->present) {
472                 if (drive->select.b.unit != 0) {
473                         /* exit with drive0 selected */
474                         SELECT_DRIVE(&hwif->drives[0]);
475                         /* allow BUSY_STAT to assert & clear */
476                         msleep(50);
477                 }
478                 /* no i/f present: mmm.. this should be a 4 -ml */
479                 return 3;
480         }
481
482         stat = tp_ops->read_status(hwif);
483
484         if (OK_STAT(stat, READY_STAT, BUSY_STAT) ||
485             drive->present || cmd == WIN_PIDENTIFY) {
486                 /* send cmd and wait */
487                 if ((rc = try_to_identify(drive, cmd))) {
488                         /* failed: try again */
489                         rc = try_to_identify(drive,cmd);
490                 }
491
492                 stat = tp_ops->read_status(hwif);
493
494                 if (stat == (BUSY_STAT | READY_STAT))
495                         return 4;
496
497                 if (rc == 1 && cmd == WIN_PIDENTIFY) {
498                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
499                                         "resetting drive\n", drive->name, stat);
500                         msleep(50);
501                         SELECT_DRIVE(drive);
502                         msleep(50);
503                         tp_ops->exec_command(hwif, WIN_SRST);
504                         (void)ide_busy_sleep(hwif);
505                         rc = try_to_identify(drive, cmd);
506                 }
507
508                 /* ensure drive IRQ is clear */
509                 stat = tp_ops->read_status(hwif);
510
511                 if (rc == 1)
512                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
513                                         drive->name, stat);
514         } else {
515                 /* not present or maybe ATAPI */
516                 rc = 3;
517         }
518         if (drive->select.b.unit != 0) {
519                 /* exit with drive0 selected */
520                 SELECT_DRIVE(&hwif->drives[0]);
521                 msleep(50);
522                 /* ensure drive irq is clear */
523                 (void)tp_ops->read_status(hwif);
524         }
525         return rc;
526 }
527
528 /*
529  *
530  */
531 static void enable_nest (ide_drive_t *drive)
532 {
533         ide_hwif_t *hwif = HWIF(drive);
534         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
535         u8 stat;
536
537         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
538         SELECT_DRIVE(drive);
539         msleep(50);
540         tp_ops->exec_command(hwif, EXABYTE_ENABLE_NEST);
541
542         if (ide_busy_sleep(hwif)) {
543                 printk(KERN_CONT "failed (timeout)\n");
544                 return;
545         }
546
547         msleep(50);
548
549         stat = tp_ops->read_status(hwif);
550
551         if (!OK_STAT(stat, 0, BAD_STAT))
552                 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
553         else
554                 printk(KERN_CONT "success\n");
555
556         /* if !(success||timed-out) */
557         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
558                 /* look for ATAPI device */
559                 (void) do_probe(drive, WIN_PIDENTIFY);
560         }
561 }
562
563 /**
564  *      probe_for_drives        -       upper level drive probe
565  *      @drive: drive to probe for
566  *
567  *      probe_for_drive() tests for existence of a given drive using do_probe()
568  *      and presents things to the user as needed.
569  *
570  *      Returns:        0  no device was found
571  *                      1  device was found (note: drive->present might
572  *                         still be 0)
573  */
574  
575 static inline u8 probe_for_drive (ide_drive_t *drive)
576 {
577         /*
578          *      In order to keep things simple we have an id
579          *      block for all drives at all times. If the device
580          *      is pre ATA or refuses ATA/ATAPI identify we
581          *      will add faked data to this.
582          *
583          *      Also note that 0 everywhere means "can't do X"
584          */
585  
586         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
587         drive->id_read = 0;
588         if(drive->id == NULL)
589         {
590                 printk(KERN_ERR "ide: out of memory for id data.\n");
591                 return 0;
592         }
593         strcpy(drive->id->model, "UNKNOWN");
594         
595         /* skip probing? */
596         if (!drive->noprobe)
597         {
598                 /* if !(success||timed-out) */
599                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
600                         /* look for ATAPI device */
601                         (void) do_probe(drive, WIN_PIDENTIFY);
602                 }
603                 if (!drive->present)
604                         /* drive not found */
605                         return 0;
606                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
607                         enable_nest(drive);
608         
609                 /* identification failed? */
610                 if (!drive->id_read) {
611                         if (drive->media == ide_disk) {
612                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
613                                         drive->name, drive->cyl,
614                                         drive->head, drive->sect);
615                         } else if (drive->media == ide_cdrom) {
616                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
617                         } else {
618                                 /* nuke it */
619                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
620                                 drive->present = 0;
621                         }
622                 }
623                 /* drive was found */
624         }
625         if(!drive->present)
626                 return 0;
627         /* The drive wasn't being helpful. Add generic info only */
628         if (drive->id_read == 0) {
629                 generic_id(drive);
630                 return 1;
631         }
632
633         if (drive->media == ide_disk) {
634                 ide_disk_init_chs(drive);
635                 ide_disk_init_mult_count(drive);
636         }
637
638         return drive->present;
639 }
640
641 static void hwif_release_dev(struct device *dev)
642 {
643         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
644
645         complete(&hwif->gendev_rel_comp);
646 }
647
648 static int ide_register_port(ide_hwif_t *hwif)
649 {
650         int ret;
651
652         /* register with global device tree */
653         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
654         hwif->gendev.driver_data = hwif;
655         if (hwif->gendev.parent == NULL) {
656                 if (hwif->dev)
657                         hwif->gendev.parent = hwif->dev;
658                 else
659                         /* Would like to do = &device_legacy */
660                         hwif->gendev.parent = NULL;
661         }
662         hwif->gendev.release = hwif_release_dev;
663         ret = device_register(&hwif->gendev);
664         if (ret < 0) {
665                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
666                         __func__, ret);
667                 goto out;
668         }
669
670         hwif->portdev = device_create_drvdata(ide_port_class, &hwif->gendev,
671                                               MKDEV(0, 0), hwif, hwif->name);
672         if (IS_ERR(hwif->portdev)) {
673                 ret = PTR_ERR(hwif->portdev);
674                 device_unregister(&hwif->gendev);
675         }
676 out:
677         return ret;
678 }
679
680 /**
681  *      ide_port_wait_ready     -       wait for port to become ready
682  *      @hwif: IDE port
683  *
684  *      This is needed on some PPCs and a bunch of BIOS-less embedded
685  *      platforms.  Typical cases are:
686  *
687  *      - The firmware hard reset the disk before booting the kernel,
688  *        the drive is still doing it's poweron-reset sequence, that
689  *        can take up to 30 seconds.
690  *
691  *      - The firmware does nothing (or no firmware), the device is
692  *        still in POST state (same as above actually).
693  *
694  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
695  *        their reset sequence even when they are non-selected slave
696  *        devices, thus preventing discovery of the main HD.
697  *
698  *      Doing this wait-for-non-busy should not harm any existing
699  *      configuration and fix some issues like the above.
700  *
701  *      BenH.
702  *
703  *      Returns 0 on success, error code (< 0) otherwise.
704  */
705
706 static int ide_port_wait_ready(ide_hwif_t *hwif)
707 {
708         int unit, rc;
709
710         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
711
712         /* Let HW settle down a bit from whatever init state we
713          * come from */
714         mdelay(2);
715
716         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
717          * I know of at least one disk who takes 31 seconds, I use 35
718          * here to be safe
719          */
720         rc = ide_wait_not_busy(hwif, 35000);
721         if (rc)
722                 return rc;
723
724         /* Now make sure both master & slave are ready */
725         for (unit = 0; unit < MAX_DRIVES; unit++) {
726                 ide_drive_t *drive = &hwif->drives[unit];
727
728                 /* Ignore disks that we will not probe for later. */
729                 if (!drive->noprobe || drive->present) {
730                         SELECT_DRIVE(drive);
731                         hwif->tp_ops->set_irq(hwif, 1);
732                         mdelay(2);
733                         rc = ide_wait_not_busy(hwif, 35000);
734                         if (rc)
735                                 goto out;
736                 } else
737                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
738                                           drive->name);
739         }
740 out:
741         /* Exit function with master reselected (let's be sane) */
742         if (unit)
743                 SELECT_DRIVE(&hwif->drives[0]);
744
745         return rc;
746 }
747
748 /**
749  *      ide_undecoded_slave     -       look for bad CF adapters
750  *      @drive1: drive
751  *
752  *      Analyse the drives on the interface and attempt to decide if we
753  *      have the same drive viewed twice. This occurs with crap CF adapters
754  *      and PCMCIA sometimes.
755  */
756
757 void ide_undecoded_slave(ide_drive_t *drive1)
758 {
759         ide_drive_t *drive0 = &drive1->hwif->drives[0];
760
761         if ((drive1->dn & 1) == 0 || drive0->present == 0)
762                 return;
763
764         /* If the models don't match they are not the same product */
765         if (strcmp(drive0->id->model, drive1->id->model))
766                 return;
767
768         /* Serial numbers do not match */
769         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
770                 return;
771
772         /* No serial number, thankfully very rare for CF */
773         if (drive0->id->serial_no[0] == 0)
774                 return;
775
776         /* Appears to be an IDE flash adapter with decode bugs */
777         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
778
779         drive1->present = 0;
780 }
781
782 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
783
784 static int ide_probe_port(ide_hwif_t *hwif)
785 {
786         unsigned long flags;
787         unsigned int irqd;
788         int unit, rc = -ENODEV;
789
790         BUG_ON(hwif->present);
791
792         if (hwif->drives[0].noprobe && hwif->drives[1].noprobe)
793                 return -EACCES;
794
795         /*
796          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
797          * we'll install our IRQ driver much later...
798          */
799         irqd = hwif->irq;
800         if (irqd)
801                 disable_irq(hwif->irq);
802
803         local_irq_set(flags);
804
805         if (ide_port_wait_ready(hwif) == -EBUSY)
806                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
807
808         /*
809          * Second drive should only exist if first drive was found,
810          * but a lot of cdrom drives are configured as single slaves.
811          */
812         for (unit = 0; unit < MAX_DRIVES; ++unit) {
813                 ide_drive_t *drive = &hwif->drives[unit];
814                 drive->dn = (hwif->channel ? 2 : 0) + unit;
815                 (void) probe_for_drive(drive);
816                 if (drive->present)
817                         rc = 0;
818         }
819
820         local_irq_restore(flags);
821
822         /*
823          * Use cached IRQ number. It might be (and is...) changed by probe
824          * code above
825          */
826         if (irqd)
827                 enable_irq(irqd);
828
829         return rc;
830 }
831
832 static void ide_port_tune_devices(ide_hwif_t *hwif)
833 {
834         const struct ide_port_ops *port_ops = hwif->port_ops;
835         int unit;
836
837         for (unit = 0; unit < MAX_DRIVES; unit++) {
838                 ide_drive_t *drive = &hwif->drives[unit];
839
840                 if (drive->present && port_ops && port_ops->quirkproc)
841                         port_ops->quirkproc(drive);
842         }
843
844         for (unit = 0; unit < MAX_DRIVES; ++unit) {
845                 ide_drive_t *drive = &hwif->drives[unit];
846
847                 if (drive->present) {
848                         ide_set_max_pio(drive);
849
850                         drive->nice1 = 1;
851
852                         if (hwif->dma_ops)
853                                 ide_set_dma(drive);
854                 }
855         }
856
857         for (unit = 0; unit < MAX_DRIVES; ++unit) {
858                 ide_drive_t *drive = &hwif->drives[unit];
859
860                 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
861                         drive->no_io_32bit = 1;
862                 else
863                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
864         }
865 }
866
867 #if MAX_HWIFS > 1
868 /*
869  * save_match() is used to simplify logic in init_irq() below.
870  *
871  * A loophole here is that we may not know about a particular
872  * hwif's irq until after that hwif is actually probed/initialized..
873  * This could be a problem for the case where an hwif is on a
874  * dual interface that requires serialization (eg. cmd640) and another
875  * hwif using one of the same irqs is initialized beforehand.
876  *
877  * This routine detects and reports such situations, but does not fix them.
878  */
879 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
880 {
881         ide_hwif_t *m = *match;
882
883         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
884                 if (!new->hwgroup)
885                         return;
886                 printk("%s: potential irq problem with %s and %s\n",
887                         hwif->name, new->name, m->name);
888         }
889         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
890                 *match = new;
891 }
892 #endif /* MAX_HWIFS > 1 */
893
894 /*
895  * init request queue
896  */
897 static int ide_init_queue(ide_drive_t *drive)
898 {
899         struct request_queue *q;
900         ide_hwif_t *hwif = HWIF(drive);
901         int max_sectors = 256;
902         int max_sg_entries = PRD_ENTRIES;
903
904         /*
905          *      Our default set up assumes the normal IDE case,
906          *      that is 64K segmenting, standard PRD setup
907          *      and LBA28. Some drivers then impose their own
908          *      limits and LBA48 we could raise it but as yet
909          *      do not.
910          */
911
912         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
913         if (!q)
914                 return 1;
915
916         q->queuedata = drive;
917         blk_queue_segment_boundary(q, 0xffff);
918
919         if (hwif->rqsize < max_sectors)
920                 max_sectors = hwif->rqsize;
921         blk_queue_max_sectors(q, max_sectors);
922
923 #ifdef CONFIG_PCI
924         /* When we have an IOMMU, we may have a problem where pci_map_sg()
925          * creates segments that don't completely match our boundary
926          * requirements and thus need to be broken up again. Because it
927          * doesn't align properly either, we may actually have to break up
928          * to more segments than what was we got in the first place, a max
929          * worst case is twice as many.
930          * This will be fixed once we teach pci_map_sg() about our boundary
931          * requirements, hopefully soon. *FIXME*
932          */
933         if (!PCI_DMA_BUS_IS_PHYS)
934                 max_sg_entries >>= 1;
935 #endif /* CONFIG_PCI */
936
937         blk_queue_max_hw_segments(q, max_sg_entries);
938         blk_queue_max_phys_segments(q, max_sg_entries);
939
940         /* assign drive queue */
941         drive->queue = q;
942
943         /* needs drive->queue to be set */
944         ide_toggle_bounce(drive, 1);
945
946         return 0;
947 }
948
949 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
950 {
951         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
952
953         spin_lock_irq(&ide_lock);
954         if (!hwgroup->drive) {
955                 /* first drive for hwgroup. */
956                 drive->next = drive;
957                 hwgroup->drive = drive;
958                 hwgroup->hwif = HWIF(hwgroup->drive);
959         } else {
960                 drive->next = hwgroup->drive->next;
961                 hwgroup->drive->next = drive;
962         }
963         spin_unlock_irq(&ide_lock);
964 }
965
966 /*
967  * For any present drive:
968  * - allocate the block device queue
969  * - link drive into the hwgroup
970  */
971 static void ide_port_setup_devices(ide_hwif_t *hwif)
972 {
973         int i;
974
975         mutex_lock(&ide_cfg_mtx);
976         for (i = 0; i < MAX_DRIVES; i++) {
977                 ide_drive_t *drive = &hwif->drives[i];
978
979                 if (!drive->present)
980                         continue;
981
982                 if (ide_init_queue(drive)) {
983                         printk(KERN_ERR "ide: failed to init %s\n",
984                                         drive->name);
985                         continue;
986                 }
987
988                 ide_add_drive_to_hwgroup(drive);
989         }
990         mutex_unlock(&ide_cfg_mtx);
991 }
992
993 static ide_hwif_t *ide_ports[MAX_HWIFS];
994
995 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
996 {
997         ide_hwgroup_t *hwgroup = hwif->hwgroup;
998
999         ide_ports[hwif->index] = NULL;
1000
1001         spin_lock_irq(&ide_lock);
1002         /*
1003          * Remove us from the hwgroup, and free
1004          * the hwgroup if we were the only member
1005          */
1006         if (hwif->next == hwif) {
1007                 BUG_ON(hwgroup->hwif != hwif);
1008                 kfree(hwgroup);
1009         } else {
1010                 /* There is another interface in hwgroup.
1011                  * Unlink us, and set hwgroup->drive and ->hwif to
1012                  * something sane.
1013                  */
1014                 ide_hwif_t *g = hwgroup->hwif;
1015
1016                 while (g->next != hwif)
1017                         g = g->next;
1018                 g->next = hwif->next;
1019                 if (hwgroup->hwif == hwif) {
1020                         /* Chose a random hwif for hwgroup->hwif.
1021                          * It's guaranteed that there are no drives
1022                          * left in the hwgroup.
1023                          */
1024                         BUG_ON(hwgroup->drive != NULL);
1025                         hwgroup->hwif = g;
1026                 }
1027                 BUG_ON(hwgroup->hwif == hwif);
1028         }
1029         spin_unlock_irq(&ide_lock);
1030 }
1031
1032 /*
1033  * This routine sets up the irq for an ide interface, and creates a new
1034  * hwgroup for the irq/hwif if none was previously assigned.
1035  *
1036  * Much of the code is for correctly detecting/handling irq sharing
1037  * and irq serialization situations.  This is somewhat complex because
1038  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1039  */
1040 static int init_irq (ide_hwif_t *hwif)
1041 {
1042         struct ide_io_ports *io_ports = &hwif->io_ports;
1043         unsigned int index;
1044         ide_hwgroup_t *hwgroup;
1045         ide_hwif_t *match = NULL;
1046
1047
1048         BUG_ON(in_interrupt());
1049         BUG_ON(irqs_disabled());        
1050         BUG_ON(hwif == NULL);
1051
1052         mutex_lock(&ide_cfg_mtx);
1053         hwif->hwgroup = NULL;
1054 #if MAX_HWIFS > 1
1055         /*
1056          * Group up with any other hwifs that share our irq(s).
1057          */
1058         for (index = 0; index < MAX_HWIFS; index++) {
1059                 ide_hwif_t *h = ide_ports[index];
1060
1061                 if (h && h->hwgroup) {  /* scan only initialized ports */
1062                         if (hwif->irq == h->irq) {
1063                                 hwif->sharing_irq = h->sharing_irq = 1;
1064                                 if (hwif->chipset != ide_pci ||
1065                                     h->chipset != ide_pci) {
1066                                         save_match(hwif, h, &match);
1067                                 }
1068                         }
1069                         if (hwif->serialized) {
1070                                 if (hwif->mate && hwif->mate->irq == h->irq)
1071                                         save_match(hwif, h, &match);
1072                         }
1073                         if (h->serialized) {
1074                                 if (h->mate && hwif->irq == h->mate->irq)
1075                                         save_match(hwif, h, &match);
1076                         }
1077                 }
1078         }
1079 #endif /* MAX_HWIFS > 1 */
1080         /*
1081          * If we are still without a hwgroup, then form a new one
1082          */
1083         if (match) {
1084                 hwgroup = match->hwgroup;
1085                 hwif->hwgroup = hwgroup;
1086                 /*
1087                  * Link us into the hwgroup.
1088                  * This must be done early, do ensure that unexpected_intr
1089                  * can find the hwif and prevent irq storms.
1090                  * No drives are attached to the new hwif, choose_drive
1091                  * can't do anything stupid (yet).
1092                  * Add ourself as the 2nd entry to the hwgroup->hwif
1093                  * linked list, the first entry is the hwif that owns
1094                  * hwgroup->handler - do not change that.
1095                  */
1096                 spin_lock_irq(&ide_lock);
1097                 hwif->next = hwgroup->hwif->next;
1098                 hwgroup->hwif->next = hwif;
1099                 BUG_ON(hwif->next == hwif);
1100                 spin_unlock_irq(&ide_lock);
1101         } else {
1102                 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1103                                        hwif_to_node(hwif));
1104                 if (hwgroup == NULL)
1105                         goto out_up;
1106
1107                 hwif->hwgroup = hwgroup;
1108                 hwgroup->hwif = hwif->next = hwif;
1109
1110                 init_timer(&hwgroup->timer);
1111                 hwgroup->timer.function = &ide_timer_expiry;
1112                 hwgroup->timer.data = (unsigned long) hwgroup;
1113         }
1114
1115         ide_ports[hwif->index] = hwif;
1116
1117         /*
1118          * Allocate the irq, if not already obtained for another hwif
1119          */
1120         if (!match || match->irq != hwif->irq) {
1121                 int sa = 0;
1122 #if defined(__mc68000__)
1123                 sa = IRQF_SHARED;
1124 #endif /* __mc68000__ */
1125
1126                 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1127                         sa = IRQF_SHARED;
1128
1129                 if (io_ports->ctl_addr)
1130                         hwif->tp_ops->set_irq(hwif, 1);
1131
1132                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1133                         goto out_unlink;
1134         }
1135
1136         if (!hwif->rqsize) {
1137                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1138                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1139                         hwif->rqsize = 256;
1140                 else
1141                         hwif->rqsize = 65536;
1142         }
1143
1144 #if !defined(__mc68000__)
1145         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1146                 io_ports->data_addr, io_ports->status_addr,
1147                 io_ports->ctl_addr, hwif->irq);
1148 #else
1149         printk("%s at 0x%08lx on irq %d", hwif->name,
1150                 io_ports->data_addr, hwif->irq);
1151 #endif /* __mc68000__ */
1152         if (match)
1153                 printk(" (%sed with %s)",
1154                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1155         printk("\n");
1156
1157         mutex_unlock(&ide_cfg_mtx);
1158         return 0;
1159 out_unlink:
1160         ide_remove_port_from_hwgroup(hwif);
1161 out_up:
1162         mutex_unlock(&ide_cfg_mtx);
1163         return 1;
1164 }
1165
1166 static int ata_lock(dev_t dev, void *data)
1167 {
1168         /* FIXME: we want to pin hwif down */
1169         return 0;
1170 }
1171
1172 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1173 {
1174         ide_hwif_t *hwif = data;
1175         int unit = *part >> PARTN_BITS;
1176         ide_drive_t *drive = &hwif->drives[unit];
1177         if (!drive->present)
1178                 return NULL;
1179
1180         if (drive->media == ide_disk)
1181                 request_module("ide-disk");
1182         if (drive->scsi)
1183                 request_module("ide-scsi");
1184         if (drive->media == ide_cdrom || drive->media == ide_optical)
1185                 request_module("ide-cd");
1186         if (drive->media == ide_tape)
1187                 request_module("ide-tape");
1188         if (drive->media == ide_floppy)
1189                 request_module("ide-floppy");
1190
1191         return NULL;
1192 }
1193
1194 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1195 {
1196         struct gendisk *p = data;
1197         *part &= (1 << PARTN_BITS) - 1;
1198         return &p->dev.kobj;
1199 }
1200
1201 static int exact_lock(dev_t dev, void *data)
1202 {
1203         struct gendisk *p = data;
1204
1205         if (!get_disk(p))
1206                 return -1;
1207         return 0;
1208 }
1209
1210 void ide_register_region(struct gendisk *disk)
1211 {
1212         blk_register_region(MKDEV(disk->major, disk->first_minor),
1213                             disk->minors, NULL, exact_match, exact_lock, disk);
1214 }
1215
1216 EXPORT_SYMBOL_GPL(ide_register_region);
1217
1218 void ide_unregister_region(struct gendisk *disk)
1219 {
1220         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1221                               disk->minors);
1222 }
1223
1224 EXPORT_SYMBOL_GPL(ide_unregister_region);
1225
1226 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1227 {
1228         ide_hwif_t *hwif = drive->hwif;
1229         unsigned int unit = (drive->select.all >> 4) & 1;
1230
1231         disk->major = hwif->major;
1232         disk->first_minor = unit << PARTN_BITS;
1233         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1234         disk->queue = drive->queue;
1235 }
1236
1237 EXPORT_SYMBOL_GPL(ide_init_disk);
1238
1239 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1240 {
1241         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1242
1243         if (drive == drive->next) {
1244                 /* special case: last drive from hwgroup. */
1245                 BUG_ON(hwgroup->drive != drive);
1246                 hwgroup->drive = NULL;
1247         } else {
1248                 ide_drive_t *walk;
1249
1250                 walk = hwgroup->drive;
1251                 while (walk->next != drive)
1252                         walk = walk->next;
1253                 walk->next = drive->next;
1254                 if (hwgroup->drive == drive) {
1255                         hwgroup->drive = drive->next;
1256                         hwgroup->hwif = hwgroup->drive->hwif;
1257                 }
1258         }
1259         BUG_ON(hwgroup->drive == drive);
1260 }
1261
1262 static void drive_release_dev (struct device *dev)
1263 {
1264         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1265
1266         ide_proc_unregister_device(drive);
1267
1268         spin_lock_irq(&ide_lock);
1269         ide_remove_drive_from_hwgroup(drive);
1270         kfree(drive->id);
1271         drive->id = NULL;
1272         drive->present = 0;
1273         /* Messed up locking ... */
1274         spin_unlock_irq(&ide_lock);
1275         blk_cleanup_queue(drive->queue);
1276         spin_lock_irq(&ide_lock);
1277         drive->queue = NULL;
1278         spin_unlock_irq(&ide_lock);
1279
1280         complete(&drive->gendev_rel_comp);
1281 }
1282
1283 static int hwif_init(ide_hwif_t *hwif)
1284 {
1285         int old_irq;
1286
1287         if (!hwif->irq) {
1288                 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1289                 if (!hwif->irq) {
1290                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1291                         return 0;
1292                 }
1293         }
1294
1295         if (register_blkdev(hwif->major, hwif->name))
1296                 return 0;
1297
1298         if (!hwif->sg_max_nents)
1299                 hwif->sg_max_nents = PRD_ENTRIES;
1300
1301         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1302                                  GFP_KERNEL);
1303         if (!hwif->sg_table) {
1304                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1305                 goto out;
1306         }
1307
1308         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1309         
1310         if (init_irq(hwif) == 0)
1311                 goto done;
1312
1313         old_irq = hwif->irq;
1314         /*
1315          *      It failed to initialise. Find the default IRQ for 
1316          *      this port and try that.
1317          */
1318         hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1319         if (!hwif->irq) {
1320                 printk("%s: Disabled unable to get IRQ %d.\n",
1321                         hwif->name, old_irq);
1322                 goto out;
1323         }
1324         if (init_irq(hwif)) {
1325                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1326                         hwif->name, old_irq, hwif->irq);
1327                 goto out;
1328         }
1329         printk("%s: probed IRQ %d failed, using default.\n",
1330                 hwif->name, hwif->irq);
1331
1332 done:
1333         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1334                             THIS_MODULE, ata_probe, ata_lock, hwif);
1335         return 1;
1336
1337 out:
1338         unregister_blkdev(hwif->major, hwif->name);
1339         return 0;
1340 }
1341
1342 static void hwif_register_devices(ide_hwif_t *hwif)
1343 {
1344         unsigned int i;
1345
1346         for (i = 0; i < MAX_DRIVES; i++) {
1347                 ide_drive_t *drive = &hwif->drives[i];
1348                 struct device *dev = &drive->gendev;
1349                 int ret;
1350
1351                 if (!drive->present)
1352                         continue;
1353
1354                 ide_add_generic_settings(drive);
1355
1356                 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1357                 dev->parent = &hwif->gendev;
1358                 dev->bus = &ide_bus_type;
1359                 dev->driver_data = drive;
1360                 dev->release = drive_release_dev;
1361
1362                 ret = device_register(dev);
1363                 if (ret < 0)
1364                         printk(KERN_WARNING "IDE: %s: device_register error: "
1365                                             "%d\n", __func__, ret);
1366         }
1367 }
1368
1369 static void ide_port_init_devices(ide_hwif_t *hwif)
1370 {
1371         const struct ide_port_ops *port_ops = hwif->port_ops;
1372         int i;
1373
1374         for (i = 0; i < MAX_DRIVES; i++) {
1375                 ide_drive_t *drive = &hwif->drives[i];
1376
1377                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1378                         drive->io_32bit = 1;
1379                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1380                         drive->unmask = 1;
1381                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1382                         drive->no_unmask = 1;
1383
1384                 if (port_ops && port_ops->init_dev)
1385                         port_ops->init_dev(drive);
1386         }
1387 }
1388
1389 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1390                           const struct ide_port_info *d)
1391 {
1392         hwif->channel = port;
1393
1394         if (d->chipset)
1395                 hwif->chipset = d->chipset;
1396
1397         if (d->init_iops)
1398                 d->init_iops(hwif);
1399
1400         if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1401             (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1402                 hwif->irq = port ? 15 : 14;
1403
1404         /* ->host_flags may be set by ->init_iops (or even earlier...) */
1405         hwif->host_flags |= d->host_flags;
1406         hwif->pio_mask = d->pio_mask;
1407
1408         if (d->tp_ops)
1409                 hwif->tp_ops = d->tp_ops;
1410
1411         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1412         if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1413                 hwif->port_ops = d->port_ops;
1414
1415         hwif->swdma_mask = d->swdma_mask;
1416         hwif->mwdma_mask = d->mwdma_mask;
1417         hwif->ultra_mask = d->udma_mask;
1418
1419         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1420                 int rc;
1421
1422                 if (d->init_dma)
1423                         rc = d->init_dma(hwif, d);
1424                 else
1425                         rc = ide_hwif_setup_dma(hwif, d);
1426
1427                 if (rc < 0) {
1428                         printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1429                         hwif->dma_base = 0;
1430                         hwif->swdma_mask = 0;
1431                         hwif->mwdma_mask = 0;
1432                         hwif->ultra_mask = 0;
1433                 } else if (d->dma_ops)
1434                         hwif->dma_ops = d->dma_ops;
1435         }
1436
1437         if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1438             ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1439                 if (hwif->mate)
1440                         hwif->mate->serialized = hwif->serialized = 1;
1441         }
1442
1443         if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1444                 hwif->rqsize = 256;
1445
1446         /* call chipset specific routine for each enabled port */
1447         if (d->init_hwif)
1448                 d->init_hwif(hwif);
1449 }
1450
1451 static void ide_port_cable_detect(ide_hwif_t *hwif)
1452 {
1453         const struct ide_port_ops *port_ops = hwif->port_ops;
1454
1455         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1456                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1457                         hwif->cbl = port_ops->cable_detect(hwif);
1458         }
1459 }
1460
1461 static ssize_t store_delete_devices(struct device *portdev,
1462                                     struct device_attribute *attr,
1463                                     const char *buf, size_t n)
1464 {
1465         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1466
1467         if (strncmp(buf, "1", n))
1468                 return -EINVAL;
1469
1470         ide_port_unregister_devices(hwif);
1471
1472         return n;
1473 };
1474
1475 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1476
1477 static ssize_t store_scan(struct device *portdev,
1478                           struct device_attribute *attr,
1479                           const char *buf, size_t n)
1480 {
1481         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1482
1483         if (strncmp(buf, "1", n))
1484                 return -EINVAL;
1485
1486         ide_port_unregister_devices(hwif);
1487         ide_port_scan(hwif);
1488
1489         return n;
1490 };
1491
1492 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1493
1494 static struct device_attribute *ide_port_attrs[] = {
1495         &dev_attr_delete_devices,
1496         &dev_attr_scan,
1497         NULL
1498 };
1499
1500 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1501 {
1502         int i, rc;
1503
1504         for (i = 0; ide_port_attrs[i]; i++) {
1505                 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1506                 if (rc)
1507                         break;
1508         }
1509
1510         return rc;
1511 }
1512
1513 static unsigned int ide_indexes;
1514
1515 /**
1516  *      ide_find_port_slot      -       find free port slot
1517  *      @d: IDE port info
1518  *
1519  *      Return the new port slot index or -ENOENT if we are out of free slots.
1520  */
1521
1522 static int ide_find_port_slot(const struct ide_port_info *d)
1523 {
1524         int idx = -ENOENT;
1525         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1526         u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1527
1528         /*
1529          * Claim an unassigned slot.
1530          *
1531          * Give preference to claiming other slots before claiming ide0/ide1,
1532          * just in case there's another interface yet-to-be-scanned
1533          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1534          *
1535          * Unless there is a bootable card that does not use the standard
1536          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1537          */
1538         mutex_lock(&ide_cfg_mtx);
1539         if (MAX_HWIFS == 1) {
1540                 if (ide_indexes == 0 && i == 0)
1541                         idx = 1;
1542         } else {
1543                 if (bootable) {
1544                         if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1545                                 idx = ffz(ide_indexes | i);
1546                 } else {
1547                         if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1548                                 idx = ffz(ide_indexes | 3);
1549                         else if ((ide_indexes & 3) != 3)
1550                                 idx = ffz(ide_indexes);
1551                 }
1552         }
1553         if (idx >= 0)
1554                 ide_indexes |= (1 << idx);
1555         mutex_unlock(&ide_cfg_mtx);
1556
1557         return idx;
1558 }
1559
1560 static void ide_free_port_slot(int idx)
1561 {
1562         mutex_lock(&ide_cfg_mtx);
1563         ide_indexes &= ~(1 << idx);
1564         mutex_unlock(&ide_cfg_mtx);
1565 }
1566
1567 struct ide_host *ide_host_alloc_all(const struct ide_port_info *d,
1568                                     hw_regs_t **hws)
1569 {
1570         struct ide_host *host;
1571         int i;
1572
1573         host = kzalloc(sizeof(*host), GFP_KERNEL);
1574         if (host == NULL)
1575                 return NULL;
1576
1577         for (i = 0; i < MAX_HWIFS; i++) {
1578                 ide_hwif_t *hwif;
1579                 int idx;
1580
1581                 if (hws[i] == NULL)
1582                         continue;
1583
1584                 hwif = kzalloc(sizeof(*hwif), GFP_KERNEL);
1585                 if (hwif == NULL)
1586                         continue;
1587
1588                 idx = ide_find_port_slot(d);
1589                 if (idx < 0) {
1590                         printk(KERN_ERR "%s: no free slot for interface\n",
1591                                         d ? d->name : "ide");
1592                         kfree(hwif);
1593                         continue;
1594                 }
1595
1596                 ide_init_port_data(hwif, idx);
1597
1598                 hwif->host = host;
1599
1600                 host->ports[i] = hwif;
1601                 host->n_ports++;
1602         }
1603
1604         if (host->n_ports == 0) {
1605                 kfree(host);
1606                 return NULL;
1607         }
1608
1609         if (hws[0])
1610                 host->dev[0] = hws[0]->dev;
1611
1612         if (d)
1613                 host->host_flags = d->host_flags;
1614
1615         return host;
1616 }
1617 EXPORT_SYMBOL_GPL(ide_host_alloc_all);
1618
1619 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1620 {
1621         hw_regs_t *hws_all[MAX_HWIFS];
1622         int i;
1623
1624         for (i = 0; i < MAX_HWIFS; i++)
1625                 hws_all[i] = (i < 4) ? hws[i] : NULL;
1626
1627         return ide_host_alloc_all(d, hws_all);
1628 }
1629 EXPORT_SYMBOL_GPL(ide_host_alloc);
1630
1631 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1632                       hw_regs_t **hws)
1633 {
1634         ide_hwif_t *hwif, *mate = NULL;
1635         int i, j = 0;
1636
1637         for (i = 0; i < MAX_HWIFS; i++) {
1638                 hwif = host->ports[i];
1639
1640                 if (hwif == NULL) {
1641                         mate = NULL;
1642                         continue;
1643                 }
1644
1645                 ide_init_port_hw(hwif, hws[i]);
1646                 ide_port_apply_params(hwif);
1647
1648                 if (d == NULL) {
1649                         mate = NULL;
1650                         continue;
1651                 }
1652
1653                 if ((i & 1) && mate) {
1654                         hwif->mate = mate;
1655                         mate->mate = hwif;
1656                 }
1657
1658                 mate = (i & 1) ? NULL : hwif;
1659
1660                 ide_init_port(hwif, i & 1, d);
1661                 ide_port_cable_detect(hwif);
1662                 ide_port_init_devices(hwif);
1663         }
1664
1665         for (i = 0; i < MAX_HWIFS; i++) {
1666                 hwif = host->ports[i];
1667
1668                 if (hwif == NULL)
1669                         continue;
1670
1671                 if (ide_probe_port(hwif) == 0)
1672                         hwif->present = 1;
1673
1674                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1675                     !hwif->mate->present)
1676                         ide_register_port(hwif);
1677
1678                 if (hwif->present)
1679                         ide_port_tune_devices(hwif);
1680         }
1681
1682         for (i = 0; i < MAX_HWIFS; i++) {
1683                 hwif = host->ports[i];
1684
1685                 if (hwif == NULL)
1686                         continue;
1687
1688                 if (hwif_init(hwif) == 0) {
1689                         printk(KERN_INFO "%s: failed to initialize IDE "
1690                                          "interface\n", hwif->name);
1691                         hwif->present = 0;
1692                         continue;
1693                 }
1694
1695                 j++;
1696
1697                 if (hwif->present)
1698                         ide_port_setup_devices(hwif);
1699
1700                 ide_acpi_init(hwif);
1701
1702                 if (hwif->present)
1703                         ide_acpi_port_init_devices(hwif);
1704         }
1705
1706         for (i = 0; i < MAX_HWIFS; i++) {
1707                 hwif = host->ports[i];
1708
1709                 if (hwif == NULL)
1710                         continue;
1711
1712                 if (hwif->chipset == ide_unknown)
1713                         hwif->chipset = ide_generic;
1714
1715                 if (hwif->present)
1716                         hwif_register_devices(hwif);
1717         }
1718
1719         for (i = 0; i < MAX_HWIFS; i++) {
1720                 hwif = host->ports[i];
1721
1722                 if (hwif == NULL)
1723                         continue;
1724
1725                 ide_sysfs_register_port(hwif);
1726                 ide_proc_register_port(hwif);
1727
1728                 if (hwif->present)
1729                         ide_proc_port_register_devices(hwif);
1730         }
1731
1732         return j ? 0 : -1;
1733 }
1734 EXPORT_SYMBOL_GPL(ide_host_register);
1735
1736 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1737                  struct ide_host **hostp)
1738 {
1739         struct ide_host *host;
1740         int rc;
1741
1742         host = ide_host_alloc(d, hws);
1743         if (host == NULL)
1744                 return -ENOMEM;
1745
1746         rc = ide_host_register(host, d, hws);
1747         if (rc) {
1748                 ide_host_free(host);
1749                 return rc;
1750         }
1751
1752         if (hostp)
1753                 *hostp = host;
1754
1755         return 0;
1756 }
1757 EXPORT_SYMBOL_GPL(ide_host_add);
1758
1759 void ide_host_free(struct ide_host *host)
1760 {
1761         ide_hwif_t *hwif;
1762         int i;
1763
1764         for (i = 0; i < MAX_HWIFS; i++) {
1765                 hwif = host->ports[i];
1766
1767                 if (hwif == NULL)
1768                         continue;
1769
1770                 ide_free_port_slot(hwif->index);
1771                 kfree(hwif);
1772         }
1773
1774         kfree(host);
1775 }
1776 EXPORT_SYMBOL_GPL(ide_host_free);
1777
1778 void ide_host_remove(struct ide_host *host)
1779 {
1780         int i;
1781
1782         for (i = 0; i < MAX_HWIFS; i++) {
1783                 if (host->ports[i])
1784                         ide_unregister(host->ports[i]);
1785         }
1786
1787         ide_host_free(host);
1788 }
1789 EXPORT_SYMBOL_GPL(ide_host_remove);
1790
1791 void ide_port_scan(ide_hwif_t *hwif)
1792 {
1793         ide_port_apply_params(hwif);
1794         ide_port_cable_detect(hwif);
1795         ide_port_init_devices(hwif);
1796
1797         if (ide_probe_port(hwif) < 0)
1798                 return;
1799
1800         hwif->present = 1;
1801
1802         ide_port_tune_devices(hwif);
1803         ide_acpi_port_init_devices(hwif);
1804         ide_port_setup_devices(hwif);
1805         hwif_register_devices(hwif);
1806         ide_proc_port_register_devices(hwif);
1807 }
1808 EXPORT_SYMBOL_GPL(ide_port_scan);
1809
1810 static void ide_legacy_init_one(hw_regs_t **hws, hw_regs_t *hw,
1811                                 u8 port_no, const struct ide_port_info *d,
1812                                 unsigned long config)
1813 {
1814         unsigned long base, ctl;
1815         int irq;
1816
1817         if (port_no == 0) {
1818                 base = 0x1f0;
1819                 ctl  = 0x3f6;
1820                 irq  = 14;
1821         } else {
1822                 base = 0x170;
1823                 ctl  = 0x376;
1824                 irq  = 15;
1825         }
1826
1827         if (!request_region(base, 8, d->name)) {
1828                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1829                                 d->name, base, base + 7);
1830                 return;
1831         }
1832
1833         if (!request_region(ctl, 1, d->name)) {
1834                 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1835                                 d->name, ctl);
1836                 release_region(base, 8);
1837                 return;
1838         }
1839
1840         ide_std_init_ports(hw, base, ctl);
1841         hw->irq = irq;
1842         hw->chipset = d->chipset;
1843         hw->config = config;
1844
1845         hws[port_no] = hw;
1846 }
1847
1848 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1849 {
1850         hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
1851
1852         memset(&hw, 0, sizeof(hw));
1853
1854         if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1855                 ide_legacy_init_one(hws, &hw[0], 0, d, config);
1856         ide_legacy_init_one(hws, &hw[1], 1, d, config);
1857
1858         if (hws[0] == NULL && hws[1] == NULL &&
1859             (d->host_flags & IDE_HFLAG_SINGLE))
1860                 return -ENOENT;
1861
1862         return ide_host_add(d, hws, NULL);
1863 }
1864 EXPORT_SYMBOL_GPL(ide_legacy_device_add);