Merge git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6
[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         /*
138          *  WIN_IDENTIFY returns little-endian info,
139          *  WIN_PIDENTIFY *usually* returns little-endian info.
140          */
141         if (cmd == WIN_PIDENTIFY) {
142                 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
143                  || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
144                  || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
145                         /* Vertos drives may still be weird */
146                         bswap ^= 1;     
147         }
148         ide_fixstring(id->model,     sizeof(id->model),     bswap);
149         ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
150         ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
151
152         /* we depend on this a lot! */
153         id->model[sizeof(id->model)-1] = '\0';
154
155         if (strstr(id->model, "E X A B Y T E N E S T"))
156                 goto err_misc;
157
158         printk(KERN_INFO "%s: %s, ", drive->name, id->model);
159
160         drive->present = 1;
161         drive->dead = 0;
162
163         /*
164          * Check for an ATAPI device
165          */
166         if (cmd == WIN_PIDENTIFY) {
167                 u8 type = (id->config >> 8) & 0x1f;
168
169                 printk(KERN_CONT "ATAPI ");
170                 switch (type) {
171                         case ide_floppy:
172                                 if (!strstr(id->model, "CD-ROM")) {
173                                         if (!strstr(id->model, "oppy") &&
174                                             !strstr(id->model, "poyp") &&
175                                             !strstr(id->model, "ZIP"))
176                                                 printk(KERN_CONT "cdrom or floppy?, assuming ");
177                                         if (drive->media != ide_cdrom) {
178                                                 printk(KERN_CONT "FLOPPY");
179                                                 drive->removable = 1;
180                                                 break;
181                                         }
182                                 }
183                                 /* Early cdrom models used zero */
184                                 type = ide_cdrom;
185                         case ide_cdrom:
186                                 drive->removable = 1;
187 #ifdef CONFIG_PPC
188                                 /* kludge for Apple PowerBook internal zip */
189                                 if (!strstr(id->model, "CD-ROM") &&
190                                     strstr(id->model, "ZIP")) {
191                                         printk(KERN_CONT "FLOPPY");
192                                         type = ide_floppy;
193                                         break;
194                                 }
195 #endif
196                                 printk(KERN_CONT "CD/DVD-ROM");
197                                 break;
198                         case ide_tape:
199                                 printk(KERN_CONT "TAPE");
200                                 break;
201                         case ide_optical:
202                                 printk(KERN_CONT "OPTICAL");
203                                 drive->removable = 1;
204                                 break;
205                         default:
206                                 printk(KERN_CONT "UNKNOWN (type %d)", type);
207                                 break;
208                 }
209                 printk(KERN_CONT " drive\n");
210                 drive->media = type;
211                 /* an ATAPI device ignores DRDY */
212                 drive->ready_stat = 0;
213                 return;
214         }
215
216         /*
217          * Not an ATAPI device: looks like a "regular" hard disk
218          */
219
220         /*
221          * 0x848a = CompactFlash device
222          * These are *not* removable in Linux definition of the term
223          */
224
225         if ((id->config != 0x848a) && (id->config & (1<<7)))
226                 drive->removable = 1;
227
228         drive->media = ide_disk;
229
230         printk(KERN_CONT "%s DISK drive\n",
231                 (id->config == 0x848a) ? "CFA" : "ATA");
232
233         return;
234
235 err_misc:
236         kfree(id);
237         drive->present = 0;
238         return;
239 }
240
241 /**
242  *      actual_try_to_identify  -       send ata/atapi identify
243  *      @drive: drive to identify
244  *      @cmd: command to use
245  *
246  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
247  *      and waits for a response.  It also monitors irqs while this is
248  *      happening, in hope of automatically determining which one is
249  *      being used by the interface.
250  *
251  *      Returns:        0  device was identified
252  *                      1  device timed-out (no response to identify request)
253  *                      2  device aborted the command (refused to identify itself)
254  */
255
256 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
257 {
258         ide_hwif_t *hwif = HWIF(drive);
259         struct ide_io_ports *io_ports = &hwif->io_ports;
260         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
261         int use_altstatus = 0, rc;
262         unsigned long timeout;
263         u8 s = 0, a = 0;
264
265         /* take a deep breath */
266         msleep(50);
267
268         if (io_ports->ctl_addr) {
269                 a = tp_ops->read_altstatus(hwif);
270                 s = tp_ops->read_status(hwif);
271                 if ((a ^ s) & ~INDEX_STAT)
272                         /* ancient Seagate drives, broken interfaces */
273                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
274                                          "instead of ALTSTATUS(0x%02x)\n",
275                                          drive->name, s, a);
276                 else
277                         /* use non-intrusive polling */
278                         use_altstatus = 1;
279         }
280
281         /* set features register for atapi
282          * identify command to be sure of reply
283          */
284         if (cmd == WIN_PIDENTIFY) {
285                 ide_task_t task;
286
287                 memset(&task, 0, sizeof(task));
288                 /* disable DMA & overlap */
289                 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
290
291                 tp_ops->tf_load(drive, &task);
292         }
293
294         /* ask drive for ID */
295         tp_ops->exec_command(hwif, cmd);
296
297         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
298         timeout += jiffies;
299         do {
300                 if (time_after(jiffies, timeout)) {
301                         /* drive timed-out */
302                         return 1;
303                 }
304                 /* give drive a breather */
305                 msleep(50);
306                 s = use_altstatus ? tp_ops->read_altstatus(hwif)
307                                   : tp_ops->read_status(hwif);
308         } while (s & BUSY_STAT);
309
310         /* wait for IRQ and DRQ_STAT */
311         msleep(50);
312         s = tp_ops->read_status(hwif);
313
314         if (OK_STAT(s, DRQ_STAT, BAD_R_STAT)) {
315                 unsigned long flags;
316
317                 /* local CPU only; some systems need this */
318                 local_irq_save(flags);
319                 /* drive returned ID */
320                 do_identify(drive, cmd);
321                 /* drive responded with ID */
322                 rc = 0;
323                 /* clear drive IRQ */
324                 (void)tp_ops->read_status(hwif);
325                 local_irq_restore(flags);
326         } else {
327                 /* drive refused ID */
328                 rc = 2;
329         }
330         return rc;
331 }
332
333 /**
334  *      try_to_identify -       try to identify a drive
335  *      @drive: drive to probe
336  *      @cmd: command to use
337  *
338  *      Issue the identify command and then do IRQ probing to
339  *      complete the identification when needed by finding the
340  *      IRQ the drive is attached to
341  */
342  
343 static int try_to_identify (ide_drive_t *drive, u8 cmd)
344 {
345         ide_hwif_t *hwif = HWIF(drive);
346         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
347         int retval;
348         int autoprobe = 0;
349         unsigned long cookie = 0;
350
351         /*
352          * Disable device irq unless we need to
353          * probe for it. Otherwise we'll get spurious
354          * interrupts during the identify-phase that
355          * the irq handler isn't expecting.
356          */
357         if (hwif->io_ports.ctl_addr) {
358                 if (!hwif->irq) {
359                         autoprobe = 1;
360                         cookie = probe_irq_on();
361                 }
362                 tp_ops->set_irq(hwif, autoprobe);
363         }
364
365         retval = actual_try_to_identify(drive, cmd);
366
367         if (autoprobe) {
368                 int irq;
369
370                 tp_ops->set_irq(hwif, 0);
371                 /* clear drive IRQ */
372                 (void)tp_ops->read_status(hwif);
373                 udelay(5);
374                 irq = probe_irq_off(cookie);
375                 if (!hwif->irq) {
376                         if (irq > 0) {
377                                 hwif->irq = irq;
378                         } else {
379                                 /* Mmmm.. multiple IRQs..
380                                  * don't know which was ours
381                                  */
382                                 printk(KERN_ERR "%s: IRQ probe failed (0x%lx)\n",
383                                         drive->name, cookie);
384                         }
385                 }
386         }
387         return retval;
388 }
389
390 static int ide_busy_sleep(ide_hwif_t *hwif)
391 {
392         unsigned long timeout = jiffies + WAIT_WORSTCASE;
393         u8 stat;
394
395         do {
396                 msleep(50);
397                 stat = hwif->tp_ops->read_status(hwif);
398                 if ((stat & BUSY_STAT) == 0)
399                         return 0;
400         } while (time_before(jiffies, timeout));
401
402         return 1;
403 }
404
405 static u8 ide_read_device(ide_drive_t *drive)
406 {
407         ide_task_t task;
408
409         memset(&task, 0, sizeof(task));
410         task.tf_flags = IDE_TFLAG_IN_DEVICE;
411
412         drive->hwif->tp_ops->tf_read(drive, &task);
413
414         return task.tf.device;
415 }
416
417 /**
418  *      do_probe                -       probe an IDE device
419  *      @drive: drive to probe
420  *      @cmd: command to use
421  *
422  *      do_probe() has the difficult job of finding a drive if it exists,
423  *      without getting hung up if it doesn't exist, without trampling on
424  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
425  *
426  *      If a drive is "known" to exist (from CMOS or kernel parameters),
427  *      but does not respond right away, the probe will "hang in there"
428  *      for the maximum wait time (about 30 seconds), otherwise it will
429  *      exit much more quickly.
430  *
431  * Returns:     0  device was identified
432  *              1  device timed-out (no response to identify request)
433  *              2  device aborted the command (refused to identify itself)
434  *              3  bad status from device (possible for ATAPI drives)
435  *              4  probe was not attempted because failure was obvious
436  */
437
438 static int do_probe (ide_drive_t *drive, u8 cmd)
439 {
440         ide_hwif_t *hwif = HWIF(drive);
441         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
442         int rc;
443         u8 stat;
444
445         if (drive->present) {
446                 /* avoid waiting for inappropriate probes */
447                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
448                         return 4;
449         }
450 #ifdef DEBUG
451         printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
452                 drive->name, drive->present, drive->media,
453                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
454 #endif
455
456         /* needed for some systems
457          * (e.g. crw9624 as drive0 with disk as slave)
458          */
459         msleep(50);
460         SELECT_DRIVE(drive);
461         msleep(50);
462
463         if (ide_read_device(drive) != drive->select.all && !drive->present) {
464                 if (drive->select.b.unit != 0) {
465                         /* exit with drive0 selected */
466                         SELECT_DRIVE(&hwif->drives[0]);
467                         /* allow BUSY_STAT to assert & clear */
468                         msleep(50);
469                 }
470                 /* no i/f present: mmm.. this should be a 4 -ml */
471                 return 3;
472         }
473
474         stat = tp_ops->read_status(hwif);
475
476         if (OK_STAT(stat, READY_STAT, BUSY_STAT) ||
477             drive->present || cmd == WIN_PIDENTIFY) {
478                 /* send cmd and wait */
479                 if ((rc = try_to_identify(drive, cmd))) {
480                         /* failed: try again */
481                         rc = try_to_identify(drive,cmd);
482                 }
483
484                 stat = tp_ops->read_status(hwif);
485
486                 if (stat == (BUSY_STAT | READY_STAT))
487                         return 4;
488
489                 if (rc == 1 && cmd == WIN_PIDENTIFY) {
490                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
491                                         "resetting drive\n", drive->name, stat);
492                         msleep(50);
493                         SELECT_DRIVE(drive);
494                         msleep(50);
495                         tp_ops->exec_command(hwif, WIN_SRST);
496                         (void)ide_busy_sleep(hwif);
497                         rc = try_to_identify(drive, cmd);
498                 }
499
500                 /* ensure drive IRQ is clear */
501                 stat = tp_ops->read_status(hwif);
502
503                 if (rc == 1)
504                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
505                                         drive->name, stat);
506         } else {
507                 /* not present or maybe ATAPI */
508                 rc = 3;
509         }
510         if (drive->select.b.unit != 0) {
511                 /* exit with drive0 selected */
512                 SELECT_DRIVE(&hwif->drives[0]);
513                 msleep(50);
514                 /* ensure drive irq is clear */
515                 (void)tp_ops->read_status(hwif);
516         }
517         return rc;
518 }
519
520 /*
521  *
522  */
523 static void enable_nest (ide_drive_t *drive)
524 {
525         ide_hwif_t *hwif = HWIF(drive);
526         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
527         u8 stat;
528
529         printk(KERN_INFO "%s: enabling %s -- ", hwif->name, drive->id->model);
530
531         SELECT_DRIVE(drive);
532         msleep(50);
533         tp_ops->exec_command(hwif, EXABYTE_ENABLE_NEST);
534
535         if (ide_busy_sleep(hwif)) {
536                 printk(KERN_CONT "failed (timeout)\n");
537                 return;
538         }
539
540         msleep(50);
541
542         stat = tp_ops->read_status(hwif);
543
544         if (!OK_STAT(stat, 0, BAD_STAT))
545                 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
546         else
547                 printk(KERN_CONT "success\n");
548
549         /* if !(success||timed-out) */
550         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
551                 /* look for ATAPI device */
552                 (void) do_probe(drive, WIN_PIDENTIFY);
553         }
554 }
555
556 /**
557  *      probe_for_drives        -       upper level drive probe
558  *      @drive: drive to probe for
559  *
560  *      probe_for_drive() tests for existence of a given drive using do_probe()
561  *      and presents things to the user as needed.
562  *
563  *      Returns:        0  no device was found
564  *                      1  device was found (note: drive->present might
565  *                         still be 0)
566  */
567  
568 static inline u8 probe_for_drive (ide_drive_t *drive)
569 {
570         /*
571          *      In order to keep things simple we have an id
572          *      block for all drives at all times. If the device
573          *      is pre ATA or refuses ATA/ATAPI identify we
574          *      will add faked data to this.
575          *
576          *      Also note that 0 everywhere means "can't do X"
577          */
578  
579         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
580         drive->id_read = 0;
581         if(drive->id == NULL)
582         {
583                 printk(KERN_ERR "ide: out of memory for id data.\n");
584                 return 0;
585         }
586         strcpy(drive->id->model, "UNKNOWN");
587         
588         /* skip probing? */
589         if (!drive->noprobe)
590         {
591                 /* if !(success||timed-out) */
592                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
593                         /* look for ATAPI device */
594                         (void) do_probe(drive, WIN_PIDENTIFY);
595                 }
596                 if (!drive->present)
597                         /* drive not found */
598                         return 0;
599                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
600                         enable_nest(drive);
601         
602                 /* identification failed? */
603                 if (!drive->id_read) {
604                         if (drive->media == ide_disk) {
605                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
606                                         drive->name, drive->cyl,
607                                         drive->head, drive->sect);
608                         } else if (drive->media == ide_cdrom) {
609                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
610                         } else {
611                                 /* nuke it */
612                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
613                                 drive->present = 0;
614                         }
615                 }
616                 /* drive was found */
617         }
618         if(!drive->present)
619                 return 0;
620         /* The drive wasn't being helpful. Add generic info only */
621         if (drive->id_read == 0) {
622                 generic_id(drive);
623                 return 1;
624         }
625
626         if (drive->media == ide_disk) {
627                 ide_disk_init_chs(drive);
628                 ide_disk_init_mult_count(drive);
629         }
630
631         return drive->present;
632 }
633
634 static void hwif_release_dev(struct device *dev)
635 {
636         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
637
638         complete(&hwif->gendev_rel_comp);
639 }
640
641 static int ide_register_port(ide_hwif_t *hwif)
642 {
643         int ret;
644
645         /* register with global device tree */
646         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
647         hwif->gendev.driver_data = hwif;
648         if (hwif->gendev.parent == NULL) {
649                 if (hwif->dev)
650                         hwif->gendev.parent = hwif->dev;
651                 else
652                         /* Would like to do = &device_legacy */
653                         hwif->gendev.parent = NULL;
654         }
655         hwif->gendev.release = hwif_release_dev;
656         ret = device_register(&hwif->gendev);
657         if (ret < 0) {
658                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
659                         __func__, ret);
660                 goto out;
661         }
662
663         hwif->portdev = device_create_drvdata(ide_port_class, &hwif->gendev,
664                                               MKDEV(0, 0), hwif, hwif->name);
665         if (IS_ERR(hwif->portdev)) {
666                 ret = PTR_ERR(hwif->portdev);
667                 device_unregister(&hwif->gendev);
668         }
669 out:
670         return ret;
671 }
672
673 /**
674  *      ide_port_wait_ready     -       wait for port to become ready
675  *      @hwif: IDE port
676  *
677  *      This is needed on some PPCs and a bunch of BIOS-less embedded
678  *      platforms.  Typical cases are:
679  *
680  *      - The firmware hard reset the disk before booting the kernel,
681  *        the drive is still doing it's poweron-reset sequence, that
682  *        can take up to 30 seconds.
683  *
684  *      - The firmware does nothing (or no firmware), the device is
685  *        still in POST state (same as above actually).
686  *
687  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
688  *        their reset sequence even when they are non-selected slave
689  *        devices, thus preventing discovery of the main HD.
690  *
691  *      Doing this wait-for-non-busy should not harm any existing
692  *      configuration and fix some issues like the above.
693  *
694  *      BenH.
695  *
696  *      Returns 0 on success, error code (< 0) otherwise.
697  */
698
699 static int ide_port_wait_ready(ide_hwif_t *hwif)
700 {
701         int unit, rc;
702
703         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
704
705         /* Let HW settle down a bit from whatever init state we
706          * come from */
707         mdelay(2);
708
709         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
710          * I know of at least one disk who takes 31 seconds, I use 35
711          * here to be safe
712          */
713         rc = ide_wait_not_busy(hwif, 35000);
714         if (rc)
715                 return rc;
716
717         /* Now make sure both master & slave are ready */
718         for (unit = 0; unit < MAX_DRIVES; unit++) {
719                 ide_drive_t *drive = &hwif->drives[unit];
720
721                 /* Ignore disks that we will not probe for later. */
722                 if (!drive->noprobe || drive->present) {
723                         SELECT_DRIVE(drive);
724                         hwif->tp_ops->set_irq(hwif, 1);
725                         mdelay(2);
726                         rc = ide_wait_not_busy(hwif, 35000);
727                         if (rc)
728                                 goto out;
729                 } else
730                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
731                                           drive->name);
732         }
733 out:
734         /* Exit function with master reselected (let's be sane) */
735         if (unit)
736                 SELECT_DRIVE(&hwif->drives[0]);
737
738         return rc;
739 }
740
741 /**
742  *      ide_undecoded_slave     -       look for bad CF adapters
743  *      @drive1: drive
744  *
745  *      Analyse the drives on the interface and attempt to decide if we
746  *      have the same drive viewed twice. This occurs with crap CF adapters
747  *      and PCMCIA sometimes.
748  */
749
750 void ide_undecoded_slave(ide_drive_t *drive1)
751 {
752         ide_drive_t *drive0 = &drive1->hwif->drives[0];
753
754         if ((drive1->dn & 1) == 0 || drive0->present == 0)
755                 return;
756
757         /* If the models don't match they are not the same product */
758         if (strcmp(drive0->id->model, drive1->id->model))
759                 return;
760
761         /* Serial numbers do not match */
762         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
763                 return;
764
765         /* No serial number, thankfully very rare for CF */
766         if (drive0->id->serial_no[0] == 0)
767                 return;
768
769         /* Appears to be an IDE flash adapter with decode bugs */
770         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
771
772         drive1->present = 0;
773 }
774
775 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
776
777 static int ide_probe_port(ide_hwif_t *hwif)
778 {
779         unsigned long flags;
780         unsigned int irqd;
781         int unit, rc = -ENODEV;
782
783         BUG_ON(hwif->present);
784
785         if (hwif->drives[0].noprobe && hwif->drives[1].noprobe)
786                 return -EACCES;
787
788         /*
789          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
790          * we'll install our IRQ driver much later...
791          */
792         irqd = hwif->irq;
793         if (irqd)
794                 disable_irq(hwif->irq);
795
796         local_irq_set(flags);
797
798         if (ide_port_wait_ready(hwif) == -EBUSY)
799                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
800
801         /*
802          * Second drive should only exist if first drive was found,
803          * but a lot of cdrom drives are configured as single slaves.
804          */
805         for (unit = 0; unit < MAX_DRIVES; ++unit) {
806                 ide_drive_t *drive = &hwif->drives[unit];
807                 drive->dn = (hwif->channel ? 2 : 0) + unit;
808                 (void) probe_for_drive(drive);
809                 if (drive->present)
810                         rc = 0;
811         }
812
813         local_irq_restore(flags);
814
815         /*
816          * Use cached IRQ number. It might be (and is...) changed by probe
817          * code above
818          */
819         if (irqd)
820                 enable_irq(irqd);
821
822         return rc;
823 }
824
825 static void ide_port_tune_devices(ide_hwif_t *hwif)
826 {
827         const struct ide_port_ops *port_ops = hwif->port_ops;
828         int unit;
829
830         for (unit = 0; unit < MAX_DRIVES; unit++) {
831                 ide_drive_t *drive = &hwif->drives[unit];
832
833                 if (drive->present && port_ops && port_ops->quirkproc)
834                         port_ops->quirkproc(drive);
835         }
836
837         for (unit = 0; unit < MAX_DRIVES; ++unit) {
838                 ide_drive_t *drive = &hwif->drives[unit];
839
840                 if (drive->present) {
841                         ide_set_max_pio(drive);
842
843                         drive->nice1 = 1;
844
845                         if (hwif->dma_ops)
846                                 ide_set_dma(drive);
847                 }
848         }
849
850         for (unit = 0; unit < MAX_DRIVES; ++unit) {
851                 ide_drive_t *drive = &hwif->drives[unit];
852
853                 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
854                         drive->no_io_32bit = 1;
855                 else
856                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
857         }
858 }
859
860 #if MAX_HWIFS > 1
861 /*
862  * save_match() is used to simplify logic in init_irq() below.
863  *
864  * A loophole here is that we may not know about a particular
865  * hwif's irq until after that hwif is actually probed/initialized..
866  * This could be a problem for the case where an hwif is on a
867  * dual interface that requires serialization (eg. cmd640) and another
868  * hwif using one of the same irqs is initialized beforehand.
869  *
870  * This routine detects and reports such situations, but does not fix them.
871  */
872 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
873 {
874         ide_hwif_t *m = *match;
875
876         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
877                 if (!new->hwgroup)
878                         return;
879                 printk(KERN_WARNING "%s: potential IRQ problem with %s and %s\n",
880                         hwif->name, new->name, m->name);
881         }
882         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
883                 *match = new;
884 }
885 #endif /* MAX_HWIFS > 1 */
886
887 /*
888  * init request queue
889  */
890 static int ide_init_queue(ide_drive_t *drive)
891 {
892         struct request_queue *q;
893         ide_hwif_t *hwif = HWIF(drive);
894         int max_sectors = 256;
895         int max_sg_entries = PRD_ENTRIES;
896
897         /*
898          *      Our default set up assumes the normal IDE case,
899          *      that is 64K segmenting, standard PRD setup
900          *      and LBA28. Some drivers then impose their own
901          *      limits and LBA48 we could raise it but as yet
902          *      do not.
903          */
904
905         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
906         if (!q)
907                 return 1;
908
909         q->queuedata = drive;
910         blk_queue_segment_boundary(q, 0xffff);
911
912         if (hwif->rqsize < max_sectors)
913                 max_sectors = hwif->rqsize;
914         blk_queue_max_sectors(q, max_sectors);
915
916 #ifdef CONFIG_PCI
917         /* When we have an IOMMU, we may have a problem where pci_map_sg()
918          * creates segments that don't completely match our boundary
919          * requirements and thus need to be broken up again. Because it
920          * doesn't align properly either, we may actually have to break up
921          * to more segments than what was we got in the first place, a max
922          * worst case is twice as many.
923          * This will be fixed once we teach pci_map_sg() about our boundary
924          * requirements, hopefully soon. *FIXME*
925          */
926         if (!PCI_DMA_BUS_IS_PHYS)
927                 max_sg_entries >>= 1;
928 #endif /* CONFIG_PCI */
929
930         blk_queue_max_hw_segments(q, max_sg_entries);
931         blk_queue_max_phys_segments(q, max_sg_entries);
932
933         /* assign drive queue */
934         drive->queue = q;
935
936         /* needs drive->queue to be set */
937         ide_toggle_bounce(drive, 1);
938
939         return 0;
940 }
941
942 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
943 {
944         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
945
946         spin_lock_irq(&ide_lock);
947         if (!hwgroup->drive) {
948                 /* first drive for hwgroup. */
949                 drive->next = drive;
950                 hwgroup->drive = drive;
951                 hwgroup->hwif = HWIF(hwgroup->drive);
952         } else {
953                 drive->next = hwgroup->drive->next;
954                 hwgroup->drive->next = drive;
955         }
956         spin_unlock_irq(&ide_lock);
957 }
958
959 /*
960  * For any present drive:
961  * - allocate the block device queue
962  * - link drive into the hwgroup
963  */
964 static void ide_port_setup_devices(ide_hwif_t *hwif)
965 {
966         int i;
967
968         mutex_lock(&ide_cfg_mtx);
969         for (i = 0; i < MAX_DRIVES; i++) {
970                 ide_drive_t *drive = &hwif->drives[i];
971
972                 if (!drive->present)
973                         continue;
974
975                 if (ide_init_queue(drive)) {
976                         printk(KERN_ERR "ide: failed to init %s\n",
977                                         drive->name);
978                         continue;
979                 }
980
981                 ide_add_drive_to_hwgroup(drive);
982         }
983         mutex_unlock(&ide_cfg_mtx);
984 }
985
986 static ide_hwif_t *ide_ports[MAX_HWIFS];
987
988 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
989 {
990         ide_hwgroup_t *hwgroup = hwif->hwgroup;
991
992         ide_ports[hwif->index] = NULL;
993
994         spin_lock_irq(&ide_lock);
995         /*
996          * Remove us from the hwgroup, and free
997          * the hwgroup if we were the only member
998          */
999         if (hwif->next == hwif) {
1000                 BUG_ON(hwgroup->hwif != hwif);
1001                 kfree(hwgroup);
1002         } else {
1003                 /* There is another interface in hwgroup.
1004                  * Unlink us, and set hwgroup->drive and ->hwif to
1005                  * something sane.
1006                  */
1007                 ide_hwif_t *g = hwgroup->hwif;
1008
1009                 while (g->next != hwif)
1010                         g = g->next;
1011                 g->next = hwif->next;
1012                 if (hwgroup->hwif == hwif) {
1013                         /* Chose a random hwif for hwgroup->hwif.
1014                          * It's guaranteed that there are no drives
1015                          * left in the hwgroup.
1016                          */
1017                         BUG_ON(hwgroup->drive != NULL);
1018                         hwgroup->hwif = g;
1019                 }
1020                 BUG_ON(hwgroup->hwif == hwif);
1021         }
1022         spin_unlock_irq(&ide_lock);
1023 }
1024
1025 /*
1026  * This routine sets up the irq for an ide interface, and creates a new
1027  * hwgroup for the irq/hwif if none was previously assigned.
1028  *
1029  * Much of the code is for correctly detecting/handling irq sharing
1030  * and irq serialization situations.  This is somewhat complex because
1031  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1032  */
1033 static int init_irq (ide_hwif_t *hwif)
1034 {
1035         struct ide_io_ports *io_ports = &hwif->io_ports;
1036         unsigned int index;
1037         ide_hwgroup_t *hwgroup;
1038         ide_hwif_t *match = NULL;
1039
1040
1041         BUG_ON(in_interrupt());
1042         BUG_ON(irqs_disabled());        
1043         BUG_ON(hwif == NULL);
1044
1045         mutex_lock(&ide_cfg_mtx);
1046         hwif->hwgroup = NULL;
1047 #if MAX_HWIFS > 1
1048         /*
1049          * Group up with any other hwifs that share our irq(s).
1050          */
1051         for (index = 0; index < MAX_HWIFS; index++) {
1052                 ide_hwif_t *h = ide_ports[index];
1053
1054                 if (h && h->hwgroup) {  /* scan only initialized ports */
1055                         if (hwif->irq == h->irq) {
1056                                 hwif->sharing_irq = h->sharing_irq = 1;
1057                                 if (hwif->chipset != ide_pci ||
1058                                     h->chipset != ide_pci) {
1059                                         save_match(hwif, h, &match);
1060                                 }
1061                         }
1062                         if (hwif->serialized) {
1063                                 if (hwif->mate && hwif->mate->irq == h->irq)
1064                                         save_match(hwif, h, &match);
1065                         }
1066                         if (h->serialized) {
1067                                 if (h->mate && hwif->irq == h->mate->irq)
1068                                         save_match(hwif, h, &match);
1069                         }
1070                 }
1071         }
1072 #endif /* MAX_HWIFS > 1 */
1073         /*
1074          * If we are still without a hwgroup, then form a new one
1075          */
1076         if (match) {
1077                 hwgroup = match->hwgroup;
1078                 hwif->hwgroup = hwgroup;
1079                 /*
1080                  * Link us into the hwgroup.
1081                  * This must be done early, do ensure that unexpected_intr
1082                  * can find the hwif and prevent irq storms.
1083                  * No drives are attached to the new hwif, choose_drive
1084                  * can't do anything stupid (yet).
1085                  * Add ourself as the 2nd entry to the hwgroup->hwif
1086                  * linked list, the first entry is the hwif that owns
1087                  * hwgroup->handler - do not change that.
1088                  */
1089                 spin_lock_irq(&ide_lock);
1090                 hwif->next = hwgroup->hwif->next;
1091                 hwgroup->hwif->next = hwif;
1092                 BUG_ON(hwif->next == hwif);
1093                 spin_unlock_irq(&ide_lock);
1094         } else {
1095                 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1096                                        hwif_to_node(hwif));
1097                 if (hwgroup == NULL)
1098                         goto out_up;
1099
1100                 hwif->hwgroup = hwgroup;
1101                 hwgroup->hwif = hwif->next = hwif;
1102
1103                 init_timer(&hwgroup->timer);
1104                 hwgroup->timer.function = &ide_timer_expiry;
1105                 hwgroup->timer.data = (unsigned long) hwgroup;
1106         }
1107
1108         ide_ports[hwif->index] = hwif;
1109
1110         /*
1111          * Allocate the irq, if not already obtained for another hwif
1112          */
1113         if (!match || match->irq != hwif->irq) {
1114                 int sa = 0;
1115 #if defined(__mc68000__)
1116                 sa = IRQF_SHARED;
1117 #endif /* __mc68000__ */
1118
1119                 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1120                         sa = IRQF_SHARED;
1121
1122                 if (io_ports->ctl_addr)
1123                         hwif->tp_ops->set_irq(hwif, 1);
1124
1125                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1126                         goto out_unlink;
1127         }
1128
1129         if (!hwif->rqsize) {
1130                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1131                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1132                         hwif->rqsize = 256;
1133                 else
1134                         hwif->rqsize = 65536;
1135         }
1136
1137 #if !defined(__mc68000__)
1138         printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1139                 io_ports->data_addr, io_ports->status_addr,
1140                 io_ports->ctl_addr, hwif->irq);
1141 #else
1142         printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
1143                 io_ports->data_addr, hwif->irq);
1144 #endif /* __mc68000__ */
1145         if (match)
1146                 printk(KERN_CONT " (%sed with %s)",
1147                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1148         printk(KERN_CONT "\n");
1149
1150         mutex_unlock(&ide_cfg_mtx);
1151         return 0;
1152 out_unlink:
1153         ide_remove_port_from_hwgroup(hwif);
1154 out_up:
1155         mutex_unlock(&ide_cfg_mtx);
1156         return 1;
1157 }
1158
1159 static int ata_lock(dev_t dev, void *data)
1160 {
1161         /* FIXME: we want to pin hwif down */
1162         return 0;
1163 }
1164
1165 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1166 {
1167         ide_hwif_t *hwif = data;
1168         int unit = *part >> PARTN_BITS;
1169         ide_drive_t *drive = &hwif->drives[unit];
1170         if (!drive->present)
1171                 return NULL;
1172
1173         if (drive->media == ide_disk)
1174                 request_module("ide-disk");
1175         if (drive->scsi)
1176                 request_module("ide-scsi");
1177         if (drive->media == ide_cdrom || drive->media == ide_optical)
1178                 request_module("ide-cd");
1179         if (drive->media == ide_tape)
1180                 request_module("ide-tape");
1181         if (drive->media == ide_floppy)
1182                 request_module("ide-floppy");
1183
1184         return NULL;
1185 }
1186
1187 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1188 {
1189         struct gendisk *p = data;
1190         *part &= (1 << PARTN_BITS) - 1;
1191         return &p->dev.kobj;
1192 }
1193
1194 static int exact_lock(dev_t dev, void *data)
1195 {
1196         struct gendisk *p = data;
1197
1198         if (!get_disk(p))
1199                 return -1;
1200         return 0;
1201 }
1202
1203 void ide_register_region(struct gendisk *disk)
1204 {
1205         blk_register_region(MKDEV(disk->major, disk->first_minor),
1206                             disk->minors, NULL, exact_match, exact_lock, disk);
1207 }
1208
1209 EXPORT_SYMBOL_GPL(ide_register_region);
1210
1211 void ide_unregister_region(struct gendisk *disk)
1212 {
1213         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1214                               disk->minors);
1215 }
1216
1217 EXPORT_SYMBOL_GPL(ide_unregister_region);
1218
1219 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1220 {
1221         ide_hwif_t *hwif = drive->hwif;
1222         unsigned int unit = (drive->select.all >> 4) & 1;
1223
1224         disk->major = hwif->major;
1225         disk->first_minor = unit << PARTN_BITS;
1226         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1227         disk->queue = drive->queue;
1228 }
1229
1230 EXPORT_SYMBOL_GPL(ide_init_disk);
1231
1232 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1233 {
1234         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1235
1236         if (drive == drive->next) {
1237                 /* special case: last drive from hwgroup. */
1238                 BUG_ON(hwgroup->drive != drive);
1239                 hwgroup->drive = NULL;
1240         } else {
1241                 ide_drive_t *walk;
1242
1243                 walk = hwgroup->drive;
1244                 while (walk->next != drive)
1245                         walk = walk->next;
1246                 walk->next = drive->next;
1247                 if (hwgroup->drive == drive) {
1248                         hwgroup->drive = drive->next;
1249                         hwgroup->hwif = hwgroup->drive->hwif;
1250                 }
1251         }
1252         BUG_ON(hwgroup->drive == drive);
1253 }
1254
1255 static void drive_release_dev (struct device *dev)
1256 {
1257         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1258
1259         ide_proc_unregister_device(drive);
1260
1261         spin_lock_irq(&ide_lock);
1262         ide_remove_drive_from_hwgroup(drive);
1263         kfree(drive->id);
1264         drive->id = NULL;
1265         drive->present = 0;
1266         /* Messed up locking ... */
1267         spin_unlock_irq(&ide_lock);
1268         blk_cleanup_queue(drive->queue);
1269         spin_lock_irq(&ide_lock);
1270         drive->queue = NULL;
1271         spin_unlock_irq(&ide_lock);
1272
1273         complete(&drive->gendev_rel_comp);
1274 }
1275
1276 static int hwif_init(ide_hwif_t *hwif)
1277 {
1278         int old_irq;
1279
1280         if (!hwif->irq) {
1281                 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1282                 if (!hwif->irq) {
1283                         printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
1284                         return 0;
1285                 }
1286         }
1287
1288         if (register_blkdev(hwif->major, hwif->name))
1289                 return 0;
1290
1291         if (!hwif->sg_max_nents)
1292                 hwif->sg_max_nents = PRD_ENTRIES;
1293
1294         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1295                                  GFP_KERNEL);
1296         if (!hwif->sg_table) {
1297                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1298                 goto out;
1299         }
1300
1301         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1302         
1303         if (init_irq(hwif) == 0)
1304                 goto done;
1305
1306         old_irq = hwif->irq;
1307         /*
1308          *      It failed to initialise. Find the default IRQ for 
1309          *      this port and try that.
1310          */
1311         hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1312         if (!hwif->irq) {
1313                 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1314                         hwif->name, old_irq);
1315                 goto out;
1316         }
1317         if (init_irq(hwif)) {
1318                 printk(KERN_ERR "%s: probed IRQ %d and default IRQ %d failed\n",
1319                         hwif->name, old_irq, hwif->irq);
1320                 goto out;
1321         }
1322         printk(KERN_WARNING "%s: probed IRQ %d failed, using default\n",
1323                 hwif->name, hwif->irq);
1324
1325 done:
1326         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1327                             THIS_MODULE, ata_probe, ata_lock, hwif);
1328         return 1;
1329
1330 out:
1331         unregister_blkdev(hwif->major, hwif->name);
1332         return 0;
1333 }
1334
1335 static void hwif_register_devices(ide_hwif_t *hwif)
1336 {
1337         unsigned int i;
1338
1339         for (i = 0; i < MAX_DRIVES; i++) {
1340                 ide_drive_t *drive = &hwif->drives[i];
1341                 struct device *dev = &drive->gendev;
1342                 int ret;
1343
1344                 if (!drive->present)
1345                         continue;
1346
1347                 ide_add_generic_settings(drive);
1348
1349                 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1350                 dev->parent = &hwif->gendev;
1351                 dev->bus = &ide_bus_type;
1352                 dev->driver_data = drive;
1353                 dev->release = drive_release_dev;
1354
1355                 ret = device_register(dev);
1356                 if (ret < 0)
1357                         printk(KERN_WARNING "IDE: %s: device_register error: "
1358                                             "%d\n", __func__, ret);
1359         }
1360 }
1361
1362 static void ide_port_init_devices(ide_hwif_t *hwif)
1363 {
1364         const struct ide_port_ops *port_ops = hwif->port_ops;
1365         int i;
1366
1367         for (i = 0; i < MAX_DRIVES; i++) {
1368                 ide_drive_t *drive = &hwif->drives[i];
1369
1370                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1371                         drive->io_32bit = 1;
1372                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1373                         drive->unmask = 1;
1374                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1375                         drive->no_unmask = 1;
1376
1377                 if (port_ops && port_ops->init_dev)
1378                         port_ops->init_dev(drive);
1379         }
1380 }
1381
1382 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1383                           const struct ide_port_info *d)
1384 {
1385         hwif->channel = port;
1386
1387         if (d->chipset)
1388                 hwif->chipset = d->chipset;
1389
1390         if (d->init_iops)
1391                 d->init_iops(hwif);
1392
1393         if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1394             (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1395                 hwif->irq = port ? 15 : 14;
1396
1397         /* ->host_flags may be set by ->init_iops (or even earlier...) */
1398         hwif->host_flags |= d->host_flags;
1399         hwif->pio_mask = d->pio_mask;
1400
1401         if (d->tp_ops)
1402                 hwif->tp_ops = d->tp_ops;
1403
1404         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1405         if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1406                 hwif->port_ops = d->port_ops;
1407
1408         hwif->swdma_mask = d->swdma_mask;
1409         hwif->mwdma_mask = d->mwdma_mask;
1410         hwif->ultra_mask = d->udma_mask;
1411
1412         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1413                 int rc;
1414
1415                 if (d->init_dma)
1416                         rc = d->init_dma(hwif, d);
1417                 else
1418                         rc = ide_hwif_setup_dma(hwif, d);
1419
1420                 if (rc < 0) {
1421                         printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1422                         hwif->dma_base = 0;
1423                         hwif->swdma_mask = 0;
1424                         hwif->mwdma_mask = 0;
1425                         hwif->ultra_mask = 0;
1426                 } else if (d->dma_ops)
1427                         hwif->dma_ops = d->dma_ops;
1428         }
1429
1430         if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1431             ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1432                 if (hwif->mate)
1433                         hwif->mate->serialized = hwif->serialized = 1;
1434         }
1435
1436         if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1437                 hwif->rqsize = 256;
1438
1439         /* call chipset specific routine for each enabled port */
1440         if (d->init_hwif)
1441                 d->init_hwif(hwif);
1442 }
1443
1444 static void ide_port_cable_detect(ide_hwif_t *hwif)
1445 {
1446         const struct ide_port_ops *port_ops = hwif->port_ops;
1447
1448         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1449                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1450                         hwif->cbl = port_ops->cable_detect(hwif);
1451         }
1452 }
1453
1454 static ssize_t store_delete_devices(struct device *portdev,
1455                                     struct device_attribute *attr,
1456                                     const char *buf, size_t n)
1457 {
1458         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1459
1460         if (strncmp(buf, "1", n))
1461                 return -EINVAL;
1462
1463         ide_port_unregister_devices(hwif);
1464
1465         return n;
1466 };
1467
1468 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1469
1470 static ssize_t store_scan(struct device *portdev,
1471                           struct device_attribute *attr,
1472                           const char *buf, size_t n)
1473 {
1474         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1475
1476         if (strncmp(buf, "1", n))
1477                 return -EINVAL;
1478
1479         ide_port_unregister_devices(hwif);
1480         ide_port_scan(hwif);
1481
1482         return n;
1483 };
1484
1485 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1486
1487 static struct device_attribute *ide_port_attrs[] = {
1488         &dev_attr_delete_devices,
1489         &dev_attr_scan,
1490         NULL
1491 };
1492
1493 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1494 {
1495         int i, rc;
1496
1497         for (i = 0; ide_port_attrs[i]; i++) {
1498                 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1499                 if (rc)
1500                         break;
1501         }
1502
1503         return rc;
1504 }
1505
1506 static unsigned int ide_indexes;
1507
1508 /**
1509  *      ide_find_port_slot      -       find free port slot
1510  *      @d: IDE port info
1511  *
1512  *      Return the new port slot index or -ENOENT if we are out of free slots.
1513  */
1514
1515 static int ide_find_port_slot(const struct ide_port_info *d)
1516 {
1517         int idx = -ENOENT;
1518         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1519         u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1520
1521         /*
1522          * Claim an unassigned slot.
1523          *
1524          * Give preference to claiming other slots before claiming ide0/ide1,
1525          * just in case there's another interface yet-to-be-scanned
1526          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1527          *
1528          * Unless there is a bootable card that does not use the standard
1529          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1530          */
1531         mutex_lock(&ide_cfg_mtx);
1532         if (MAX_HWIFS == 1) {
1533                 if (ide_indexes == 0 && i == 0)
1534                         idx = 1;
1535         } else {
1536                 if (bootable) {
1537                         if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1538                                 idx = ffz(ide_indexes | i);
1539                 } else {
1540                         if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1541                                 idx = ffz(ide_indexes | 3);
1542                         else if ((ide_indexes & 3) != 3)
1543                                 idx = ffz(ide_indexes);
1544                 }
1545         }
1546         if (idx >= 0)
1547                 ide_indexes |= (1 << idx);
1548         mutex_unlock(&ide_cfg_mtx);
1549
1550         return idx;
1551 }
1552
1553 static void ide_free_port_slot(int idx)
1554 {
1555         mutex_lock(&ide_cfg_mtx);
1556         ide_indexes &= ~(1 << idx);
1557         mutex_unlock(&ide_cfg_mtx);
1558 }
1559
1560 struct ide_host *ide_host_alloc_all(const struct ide_port_info *d,
1561                                     hw_regs_t **hws)
1562 {
1563         struct ide_host *host;
1564         int i;
1565
1566         host = kzalloc(sizeof(*host), GFP_KERNEL);
1567         if (host == NULL)
1568                 return NULL;
1569
1570         for (i = 0; i < MAX_HWIFS; i++) {
1571                 ide_hwif_t *hwif;
1572                 int idx;
1573
1574                 if (hws[i] == NULL)
1575                         continue;
1576
1577                 hwif = kzalloc(sizeof(*hwif), GFP_KERNEL);
1578                 if (hwif == NULL)
1579                         continue;
1580
1581                 idx = ide_find_port_slot(d);
1582                 if (idx < 0) {
1583                         printk(KERN_ERR "%s: no free slot for interface\n",
1584                                         d ? d->name : "ide");
1585                         kfree(hwif);
1586                         continue;
1587                 }
1588
1589                 ide_init_port_data(hwif, idx);
1590
1591                 hwif->host = host;
1592
1593                 host->ports[i] = hwif;
1594                 host->n_ports++;
1595         }
1596
1597         if (host->n_ports == 0) {
1598                 kfree(host);
1599                 return NULL;
1600         }
1601
1602         if (hws[0])
1603                 host->dev[0] = hws[0]->dev;
1604
1605         if (d)
1606                 host->host_flags = d->host_flags;
1607
1608         return host;
1609 }
1610 EXPORT_SYMBOL_GPL(ide_host_alloc_all);
1611
1612 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1613 {
1614         hw_regs_t *hws_all[MAX_HWIFS];
1615         int i;
1616
1617         for (i = 0; i < MAX_HWIFS; i++)
1618                 hws_all[i] = (i < 4) ? hws[i] : NULL;
1619
1620         return ide_host_alloc_all(d, hws_all);
1621 }
1622 EXPORT_SYMBOL_GPL(ide_host_alloc);
1623
1624 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1625                       hw_regs_t **hws)
1626 {
1627         ide_hwif_t *hwif, *mate = NULL;
1628         int i, j = 0;
1629
1630         for (i = 0; i < MAX_HWIFS; i++) {
1631                 hwif = host->ports[i];
1632
1633                 if (hwif == NULL) {
1634                         mate = NULL;
1635                         continue;
1636                 }
1637
1638                 ide_init_port_hw(hwif, hws[i]);
1639                 ide_port_apply_params(hwif);
1640
1641                 if (d == NULL) {
1642                         mate = NULL;
1643                         continue;
1644                 }
1645
1646                 if ((i & 1) && mate) {
1647                         hwif->mate = mate;
1648                         mate->mate = hwif;
1649                 }
1650
1651                 mate = (i & 1) ? NULL : hwif;
1652
1653                 ide_init_port(hwif, i & 1, d);
1654                 ide_port_cable_detect(hwif);
1655                 ide_port_init_devices(hwif);
1656         }
1657
1658         for (i = 0; i < MAX_HWIFS; i++) {
1659                 hwif = host->ports[i];
1660
1661                 if (hwif == NULL)
1662                         continue;
1663
1664                 if (ide_probe_port(hwif) == 0)
1665                         hwif->present = 1;
1666
1667                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1668                     !hwif->mate->present)
1669                         ide_register_port(hwif);
1670
1671                 if (hwif->present)
1672                         ide_port_tune_devices(hwif);
1673         }
1674
1675         for (i = 0; i < MAX_HWIFS; i++) {
1676                 hwif = host->ports[i];
1677
1678                 if (hwif == NULL)
1679                         continue;
1680
1681                 if (hwif_init(hwif) == 0) {
1682                         printk(KERN_INFO "%s: failed to initialize IDE "
1683                                          "interface\n", hwif->name);
1684                         hwif->present = 0;
1685                         continue;
1686                 }
1687
1688                 j++;
1689
1690                 if (hwif->present)
1691                         ide_port_setup_devices(hwif);
1692
1693                 ide_acpi_init(hwif);
1694
1695                 if (hwif->present)
1696                         ide_acpi_port_init_devices(hwif);
1697         }
1698
1699         for (i = 0; i < MAX_HWIFS; i++) {
1700                 hwif = host->ports[i];
1701
1702                 if (hwif == NULL)
1703                         continue;
1704
1705                 if (hwif->chipset == ide_unknown)
1706                         hwif->chipset = ide_generic;
1707
1708                 if (hwif->present)
1709                         hwif_register_devices(hwif);
1710         }
1711
1712         for (i = 0; i < MAX_HWIFS; i++) {
1713                 hwif = host->ports[i];
1714
1715                 if (hwif == NULL)
1716                         continue;
1717
1718                 ide_sysfs_register_port(hwif);
1719                 ide_proc_register_port(hwif);
1720
1721                 if (hwif->present)
1722                         ide_proc_port_register_devices(hwif);
1723         }
1724
1725         return j ? 0 : -1;
1726 }
1727 EXPORT_SYMBOL_GPL(ide_host_register);
1728
1729 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1730                  struct ide_host **hostp)
1731 {
1732         struct ide_host *host;
1733         int rc;
1734
1735         host = ide_host_alloc(d, hws);
1736         if (host == NULL)
1737                 return -ENOMEM;
1738
1739         rc = ide_host_register(host, d, hws);
1740         if (rc) {
1741                 ide_host_free(host);
1742                 return rc;
1743         }
1744
1745         if (hostp)
1746                 *hostp = host;
1747
1748         return 0;
1749 }
1750 EXPORT_SYMBOL_GPL(ide_host_add);
1751
1752 void ide_host_free(struct ide_host *host)
1753 {
1754         ide_hwif_t *hwif;
1755         int i;
1756
1757         for (i = 0; i < MAX_HWIFS; i++) {
1758                 hwif = host->ports[i];
1759
1760                 if (hwif == NULL)
1761                         continue;
1762
1763                 ide_free_port_slot(hwif->index);
1764                 kfree(hwif);
1765         }
1766
1767         kfree(host);
1768 }
1769 EXPORT_SYMBOL_GPL(ide_host_free);
1770
1771 void ide_host_remove(struct ide_host *host)
1772 {
1773         int i;
1774
1775         for (i = 0; i < MAX_HWIFS; i++) {
1776                 if (host->ports[i])
1777                         ide_unregister(host->ports[i]);
1778         }
1779
1780         ide_host_free(host);
1781 }
1782 EXPORT_SYMBOL_GPL(ide_host_remove);
1783
1784 void ide_port_scan(ide_hwif_t *hwif)
1785 {
1786         ide_port_apply_params(hwif);
1787         ide_port_cable_detect(hwif);
1788         ide_port_init_devices(hwif);
1789
1790         if (ide_probe_port(hwif) < 0)
1791                 return;
1792
1793         hwif->present = 1;
1794
1795         ide_port_tune_devices(hwif);
1796         ide_acpi_port_init_devices(hwif);
1797         ide_port_setup_devices(hwif);
1798         hwif_register_devices(hwif);
1799         ide_proc_port_register_devices(hwif);
1800 }
1801 EXPORT_SYMBOL_GPL(ide_port_scan);
1802
1803 static void ide_legacy_init_one(hw_regs_t **hws, hw_regs_t *hw,
1804                                 u8 port_no, const struct ide_port_info *d,
1805                                 unsigned long config)
1806 {
1807         unsigned long base, ctl;
1808         int irq;
1809
1810         if (port_no == 0) {
1811                 base = 0x1f0;
1812                 ctl  = 0x3f6;
1813                 irq  = 14;
1814         } else {
1815                 base = 0x170;
1816                 ctl  = 0x376;
1817                 irq  = 15;
1818         }
1819
1820         if (!request_region(base, 8, d->name)) {
1821                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1822                                 d->name, base, base + 7);
1823                 return;
1824         }
1825
1826         if (!request_region(ctl, 1, d->name)) {
1827                 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1828                                 d->name, ctl);
1829                 release_region(base, 8);
1830                 return;
1831         }
1832
1833         ide_std_init_ports(hw, base, ctl);
1834         hw->irq = irq;
1835         hw->chipset = d->chipset;
1836         hw->config = config;
1837
1838         hws[port_no] = hw;
1839 }
1840
1841 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1842 {
1843         hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
1844
1845         memset(&hw, 0, sizeof(hw));
1846
1847         if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1848                 ide_legacy_init_one(hws, &hw[0], 0, d, config);
1849         ide_legacy_init_one(hws, &hw[1], 1, d, config);
1850
1851         if (hws[0] == NULL && hws[1] == NULL &&
1852             (d->host_flags & IDE_HFLAG_SINGLE))
1853                 return -ENOENT;
1854
1855         return ide_host_add(d, hws, NULL);
1856 }
1857 EXPORT_SYMBOL_GPL(ide_legacy_device_add);