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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/drivers/ide/ide-probe.c Version 1.11 Mar 05, 2003
3 *
4 * Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
5 */
6
7/*
8 * Mostly written by Mark Lord <mlord@pobox.com>
9 * and Gadi Oxman <gadio@netvision.net.il>
10 * and Andre Hedrick <andre@linux-ide.org>
11 *
12 * See linux/MAINTAINERS for address of current maintainer.
13 *
14 * This is the IDE probe module, as evolved from hd.c and ide.c.
15 *
16 * Version 1.00 move drive probing code from ide.c to ide-probe.c
17 * Version 1.01 fix compilation problem for m68k
18 * Version 1.02 increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
19 * by Andrea Arcangeli
20 * Version 1.03 fix for (hwif->chipset == ide_4drives)
21 * Version 1.04 fixed buggy treatments of known flash memory cards
22 *
23 * Version 1.05 fix for (hwif->chipset == ide_pdc4030)
24 * added ide6/7/8/9
25 * allowed for secondary flash card to be detectable
26 * with new flag : drive->ata_flash : 1;
27 * Version 1.06 stream line request queue and prep for cascade project.
28 * Version 1.07 max_sect <= 255; slower disks would get behind and
29 * then fall over when they get to 256. Paul G.
30 * Version 1.10 Update set for new IDE. drive->id is now always
31 * valid after probe time even with noprobe
32 */
33
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/module.h>
35#include <linux/types.h>
36#include <linux/string.h>
37#include <linux/kernel.h>
38#include <linux/timer.h>
39#include <linux/mm.h>
40#include <linux/interrupt.h>
41#include <linux/major.h>
42#include <linux/errno.h>
43#include <linux/genhd.h>
44#include <linux/slab.h>
45#include <linux/delay.h>
46#include <linux/ide.h>
47#include <linux/spinlock.h>
48#include <linux/kmod.h>
49#include <linux/pci.h>
50
51#include <asm/byteorder.h>
52#include <asm/irq.h>
53#include <asm/uaccess.h>
54#include <asm/io.h>
55
56/**
57 * generic_id - add a generic drive id
58 * @drive: drive to make an ID block for
59 *
60 * Add a fake id field to the drive we are passed. This allows
61 * use to skip a ton of NULL checks (which people always miss)
62 * and make drive properties unconditional outside of this file
63 */
64
65static void generic_id(ide_drive_t *drive)
66{
67 drive->id->cyls = drive->cyl;
68 drive->id->heads = drive->head;
69 drive->id->sectors = drive->sect;
70 drive->id->cur_cyls = drive->cyl;
71 drive->id->cur_heads = drive->head;
72 drive->id->cur_sectors = drive->sect;
73}
74
75static void ide_disk_init_chs(ide_drive_t *drive)
76{
77 struct hd_driveid *id = drive->id;
78
79 /* Extract geometry if we did not already have one for the drive */
80 if (!drive->cyl || !drive->head || !drive->sect) {
81 drive->cyl = drive->bios_cyl = id->cyls;
82 drive->head = drive->bios_head = id->heads;
83 drive->sect = drive->bios_sect = id->sectors;
84 }
85
86 /* Handle logical geometry translation by the drive */
87 if ((id->field_valid & 1) && id->cur_cyls &&
88 id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
89 drive->cyl = id->cur_cyls;
90 drive->head = id->cur_heads;
91 drive->sect = id->cur_sectors;
92 }
93
94 /* Use physical geometry if what we have still makes no sense */
95 if (drive->head > 16 && id->heads && id->heads <= 16) {
96 drive->cyl = id->cyls;
97 drive->head = id->heads;
98 drive->sect = id->sectors;
99 }
100}
101
102static void ide_disk_init_mult_count(ide_drive_t *drive)
103{
104 struct hd_driveid *id = drive->id;
105
106 drive->mult_count = 0;
107 if (id->max_multsect) {
108#ifdef CONFIG_IDEDISK_MULTI_MODE
109 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
110 id->multsect_valid = id->multsect ? 1 : 0;
111 drive->mult_req = id->multsect_valid ? id->max_multsect : INITIAL_MULT_COUNT;
112 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
113#else /* original, pre IDE-NFG, per request of AC */
114 drive->mult_req = INITIAL_MULT_COUNT;
115 if (drive->mult_req > id->max_multsect)
116 drive->mult_req = id->max_multsect;
117 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
118 drive->special.b.set_multmode = 1;
119#endif
120 }
121}
122
123/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 * do_identify - identify a drive
125 * @drive: drive to identify
126 * @cmd: command used
127 *
128 * Called when we have issued a drive identify command to
129 * read and parse the results. This function is run with
130 * interrupts disabled.
131 */
132
133static inline void do_identify (ide_drive_t *drive, u8 cmd)
134{
135 ide_hwif_t *hwif = HWIF(drive);
136 int bswap = 1;
137 struct hd_driveid *id;
138
139 id = drive->id;
140 /* read 512 bytes of id info */
141 hwif->ata_input_data(drive, id, SECTOR_WORDS);
142
143 drive->id_read = 1;
144 local_irq_enable();
145 ide_fix_driveid(id);
146
Robert P. J. Daye71bc142007-07-09 23:17:57 +0200147#if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 /*
149 * EATA SCSI controllers do a hardware ATA emulation:
150 * Ignore them if there is a driver for them available.
151 */
152 if ((id->model[0] == 'P' && id->model[1] == 'M') ||
153 (id->model[0] == 'S' && id->model[1] == 'K')) {
154 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
155 goto err_misc;
156 }
Robert P. J. Daye71bc142007-07-09 23:17:57 +0200157#endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
159 /*
160 * WIN_IDENTIFY returns little-endian info,
161 * WIN_PIDENTIFY *usually* returns little-endian info.
162 */
163 if (cmd == WIN_PIDENTIFY) {
164 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
165 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
166 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
167 /* Vertos drives may still be weird */
168 bswap ^= 1;
169 }
170 ide_fixstring(id->model, sizeof(id->model), bswap);
171 ide_fixstring(id->fw_rev, sizeof(id->fw_rev), bswap);
172 ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
173
174 if (strstr(id->model, "E X A B Y T E N E S T"))
175 goto err_misc;
176
177 /* we depend on this a lot! */
178 id->model[sizeof(id->model)-1] = '\0';
179 printk("%s: %s, ", drive->name, id->model);
180 drive->present = 1;
181 drive->dead = 0;
182
183 /*
184 * Check for an ATAPI device
185 */
186 if (cmd == WIN_PIDENTIFY) {
187 u8 type = (id->config >> 8) & 0x1f;
188 printk("ATAPI ");
189 switch (type) {
190 case ide_floppy:
191 if (!strstr(id->model, "CD-ROM")) {
192 if (!strstr(id->model, "oppy") &&
193 !strstr(id->model, "poyp") &&
194 !strstr(id->model, "ZIP"))
195 printk("cdrom or floppy?, assuming ");
196 if (drive->media != ide_cdrom) {
197 printk ("FLOPPY");
198 drive->removable = 1;
199 break;
200 }
201 }
202 /* Early cdrom models used zero */
203 type = ide_cdrom;
204 case ide_cdrom:
205 drive->removable = 1;
206#ifdef CONFIG_PPC
207 /* kludge for Apple PowerBook internal zip */
208 if (!strstr(id->model, "CD-ROM") &&
209 strstr(id->model, "ZIP")) {
210 printk ("FLOPPY");
211 type = ide_floppy;
212 break;
213 }
214#endif
215 printk ("CD/DVD-ROM");
216 break;
217 case ide_tape:
218 printk ("TAPE");
219 break;
220 case ide_optical:
221 printk ("OPTICAL");
222 drive->removable = 1;
223 break;
224 default:
225 printk("UNKNOWN (type %d)", type);
226 break;
227 }
228 printk (" drive\n");
229 drive->media = type;
230 /* an ATAPI device ignores DRDY */
231 drive->ready_stat = 0;
232 return;
233 }
234
235 /*
236 * Not an ATAPI device: looks like a "regular" hard disk
237 */
Richard Purdie98109332006-02-03 03:04:55 -0800238
239 /*
240 * 0x848a = CompactFlash device
241 * These are *not* removable in Linux definition of the term
242 */
243
244 if ((id->config != 0x848a) && (id->config & (1<<7)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 drive->removable = 1;
246
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 drive->media = ide_disk;
Richard Purdie98109332006-02-03 03:04:55 -0800248 printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 QUIRK_LIST(drive);
250 return;
251
252err_misc:
253 kfree(id);
254 drive->present = 0;
255 return;
256}
257
258/**
259 * actual_try_to_identify - send ata/atapi identify
260 * @drive: drive to identify
261 * @cmd: command to use
262 *
263 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
264 * and waits for a response. It also monitors irqs while this is
265 * happening, in hope of automatically determining which one is
266 * being used by the interface.
267 *
268 * Returns: 0 device was identified
269 * 1 device timed-out (no response to identify request)
270 * 2 device aborted the command (refused to identify itself)
271 */
272
273static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
274{
275 ide_hwif_t *hwif = HWIF(drive);
276 int rc;
277 unsigned long hd_status;
278 unsigned long timeout;
279 u8 s = 0, a = 0;
280
281 /* take a deep breath */
282 msleep(50);
283
284 if (IDE_CONTROL_REG) {
285 a = hwif->INB(IDE_ALTSTATUS_REG);
286 s = hwif->INB(IDE_STATUS_REG);
287 if ((a ^ s) & ~INDEX_STAT) {
288 printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
289 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
290 /* ancient Seagate drives, broken interfaces */
291 hd_status = IDE_STATUS_REG;
292 } else {
293 /* use non-intrusive polling */
294 hd_status = IDE_ALTSTATUS_REG;
295 }
296 } else
297 hd_status = IDE_STATUS_REG;
298
299 /* set features register for atapi
300 * identify command to be sure of reply
301 */
302 if ((cmd == WIN_PIDENTIFY))
303 /* disable dma & overlap */
304 hwif->OUTB(0, IDE_FEATURE_REG);
305
306 /* ask drive for ID */
307 hwif->OUTB(cmd, IDE_COMMAND_REG);
308
309 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
310 timeout += jiffies;
311 do {
312 if (time_after(jiffies, timeout)) {
313 /* drive timed-out */
314 return 1;
315 }
316 /* give drive a breather */
317 msleep(50);
318 } while ((hwif->INB(hd_status)) & BUSY_STAT);
319
320 /* wait for IRQ and DRQ_STAT */
321 msleep(50);
322 if (OK_STAT((hwif->INB(IDE_STATUS_REG)), 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) hwif->INB(IDE_STATUS_REG);
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
351static int try_to_identify (ide_drive_t *drive, u8 cmd)
352{
353 ide_hwif_t *hwif = HWIF(drive);
354 int retval;
355 int autoprobe = 0;
356 unsigned long cookie = 0;
357
358 /*
359 * Disable device irq unless we need to
360 * probe for it. Otherwise we'll get spurious
361 * interrupts during the identify-phase that
362 * the irq handler isn't expecting.
363 */
364 if (IDE_CONTROL_REG) {
365 u8 ctl = drive->ctl | 2;
366 if (!hwif->irq) {
367 autoprobe = 1;
368 cookie = probe_irq_on();
369 /* enable device irq */
370 ctl &= ~2;
371 }
372 hwif->OUTB(ctl, IDE_CONTROL_REG);
373 }
374
375 retval = actual_try_to_identify(drive, cmd);
376
377 if (autoprobe) {
378 int irq;
379 /* mask device irq */
380 hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
381 /* clear drive IRQ */
382 (void) hwif->INB(IDE_STATUS_REG);
383 udelay(5);
384 irq = probe_irq_off(cookie);
385 if (!hwif->irq) {
386 if (irq > 0) {
387 hwif->irq = irq;
388 } else {
389 /* Mmmm.. multiple IRQs..
390 * don't know which was ours
391 */
392 printk("%s: IRQ probe failed (0x%lx)\n",
393 drive->name, cookie);
394 }
395 }
396 }
397 return retval;
398}
399
400
401/**
402 * do_probe - probe an IDE device
403 * @drive: drive to probe
404 * @cmd: command to use
405 *
406 * do_probe() has the difficult job of finding a drive if it exists,
407 * without getting hung up if it doesn't exist, without trampling on
408 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
409 *
410 * If a drive is "known" to exist (from CMOS or kernel parameters),
411 * but does not respond right away, the probe will "hang in there"
412 * for the maximum wait time (about 30 seconds), otherwise it will
413 * exit much more quickly.
414 *
415 * Returns: 0 device was identified
416 * 1 device timed-out (no response to identify request)
417 * 2 device aborted the command (refused to identify itself)
418 * 3 bad status from device (possible for ATAPI drives)
419 * 4 probe was not attempted because failure was obvious
420 */
421
422static int do_probe (ide_drive_t *drive, u8 cmd)
423{
424 int rc;
425 ide_hwif_t *hwif = HWIF(drive);
426
427 if (drive->present) {
428 /* avoid waiting for inappropriate probes */
429 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
430 return 4;
431 }
432#ifdef DEBUG
433 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
434 drive->name, drive->present, drive->media,
435 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
436#endif
437
438 /* needed for some systems
439 * (e.g. crw9624 as drive0 with disk as slave)
440 */
441 msleep(50);
442 SELECT_DRIVE(drive);
443 msleep(50);
444 if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
445 if (drive->select.b.unit != 0) {
446 /* exit with drive0 selected */
447 SELECT_DRIVE(&hwif->drives[0]);
448 /* allow BUSY_STAT to assert & clear */
449 msleep(50);
450 }
451 /* no i/f present: mmm.. this should be a 4 -ml */
452 return 3;
453 }
454
455 if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
456 drive->present || cmd == WIN_PIDENTIFY) {
457 /* send cmd and wait */
458 if ((rc = try_to_identify(drive, cmd))) {
459 /* failed: try again */
460 rc = try_to_identify(drive,cmd);
461 }
462 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
463 return 4;
464
465 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
466 ((drive->autotune == IDE_TUNE_DEFAULT) ||
467 (drive->autotune == IDE_TUNE_AUTO))) {
468 unsigned long timeout;
469 printk("%s: no response (status = 0x%02x), "
470 "resetting drive\n", drive->name,
471 hwif->INB(IDE_STATUS_REG));
472 msleep(50);
473 hwif->OUTB(drive->select.all, IDE_SELECT_REG);
474 msleep(50);
475 hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
476 timeout = jiffies;
477 while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
478 time_before(jiffies, timeout + WAIT_WORSTCASE))
479 msleep(50);
480 rc = try_to_identify(drive, cmd);
481 }
482 if (rc == 1)
483 printk("%s: no response (status = 0x%02x)\n",
484 drive->name, hwif->INB(IDE_STATUS_REG));
485 /* ensure drive irq is clear */
486 (void) hwif->INB(IDE_STATUS_REG);
487 } else {
488 /* not present or maybe ATAPI */
489 rc = 3;
490 }
491 if (drive->select.b.unit != 0) {
492 /* exit with drive0 selected */
493 SELECT_DRIVE(&hwif->drives[0]);
494 msleep(50);
495 /* ensure drive irq is clear */
496 (void) hwif->INB(IDE_STATUS_REG);
497 }
498 return rc;
499}
500
501/*
502 *
503 */
504static void enable_nest (ide_drive_t *drive)
505{
506 ide_hwif_t *hwif = HWIF(drive);
507 unsigned long timeout;
508
509 printk("%s: enabling %s -- ", hwif->name, drive->id->model);
510 SELECT_DRIVE(drive);
511 msleep(50);
512 hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
513 timeout = jiffies + WAIT_WORSTCASE;
514 do {
515 if (time_after(jiffies, timeout)) {
516 printk("failed (timeout)\n");
517 return;
518 }
519 msleep(50);
520 } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
521
522 msleep(50);
523
524 if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
525 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
526 } else {
527 printk("success\n");
528 }
529
530 /* if !(success||timed-out) */
531 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
532 /* look for ATAPI device */
533 (void) do_probe(drive, WIN_PIDENTIFY);
534 }
535}
536
537/**
538 * probe_for_drives - upper level drive probe
539 * @drive: drive to probe for
540 *
541 * probe_for_drive() tests for existence of a given drive using do_probe()
542 * and presents things to the user as needed.
543 *
544 * Returns: 0 no device was found
545 * 1 device was found (note: drive->present might
546 * still be 0)
547 */
548
549static inline u8 probe_for_drive (ide_drive_t *drive)
550{
551 /*
552 * In order to keep things simple we have an id
553 * block for all drives at all times. If the device
554 * is pre ATA or refuses ATA/ATAPI identify we
555 * will add faked data to this.
556 *
557 * Also note that 0 everywhere means "can't do X"
558 */
559
Deepak Saxenaf5e3c2f2005-11-07 01:01:25 -0800560 drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 drive->id_read = 0;
562 if(drive->id == NULL)
563 {
564 printk(KERN_ERR "ide: out of memory for id data.\n");
565 return 0;
566 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 strcpy(drive->id->model, "UNKNOWN");
568
569 /* skip probing? */
570 if (!drive->noprobe)
571 {
572 /* if !(success||timed-out) */
573 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
574 /* look for ATAPI device */
575 (void) do_probe(drive, WIN_PIDENTIFY);
576 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 if (!drive->present)
578 /* drive not found */
579 return 0;
Alan Cox78595572007-07-03 22:28:35 +0200580 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
581 enable_nest(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582
583 /* identification failed? */
584 if (!drive->id_read) {
585 if (drive->media == ide_disk) {
586 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
587 drive->name, drive->cyl,
588 drive->head, drive->sect);
589 } else if (drive->media == ide_cdrom) {
590 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
591 } else {
592 /* nuke it */
593 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
594 drive->present = 0;
595 }
596 }
597 /* drive was found */
598 }
599 if(!drive->present)
600 return 0;
601 /* The drive wasn't being helpful. Add generic info only */
602 if (drive->id_read == 0) {
603 generic_id(drive);
604 return 1;
605 }
606
607 if (drive->media == ide_disk) {
608 ide_disk_init_chs(drive);
609 ide_disk_init_mult_count(drive);
610 }
611
612 return drive->present;
613}
614
615static void hwif_release_dev (struct device *dev)
616{
617 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
618
Aleksey Makarovf36d4022006-01-09 15:59:27 -0800619 complete(&hwif->gendev_rel_comp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620}
621
622static void hwif_register (ide_hwif_t *hwif)
623{
Randy Dunlap349ae232006-10-03 01:14:23 -0700624 int ret;
625
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 /* register with global device tree */
627 strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
628 hwif->gendev.driver_data = hwif;
629 if (hwif->gendev.parent == NULL) {
630 if (hwif->pci_dev)
631 hwif->gendev.parent = &hwif->pci_dev->dev;
632 else
633 /* Would like to do = &device_legacy */
634 hwif->gendev.parent = NULL;
635 }
636 hwif->gendev.release = hwif_release_dev;
Randy Dunlap349ae232006-10-03 01:14:23 -0700637 ret = device_register(&hwif->gendev);
638 if (ret < 0)
639 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
640 __FUNCTION__, ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641}
642
643static int wait_hwif_ready(ide_hwif_t *hwif)
644{
645 int rc;
646
647 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
648
649 /* Let HW settle down a bit from whatever init state we
650 * come from */
651 mdelay(2);
652
653 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
654 * I know of at least one disk who takes 31 seconds, I use 35
655 * here to be safe
656 */
657 rc = ide_wait_not_busy(hwif, 35000);
658 if (rc)
659 return rc;
660
661 /* Now make sure both master & slave are ready */
662 SELECT_DRIVE(&hwif->drives[0]);
663 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
664 mdelay(2);
Marcello Maggioni284e4232005-05-26 15:47:35 +0200665 rc = ide_wait_not_busy(hwif, 35000);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 if (rc)
667 return rc;
668 SELECT_DRIVE(&hwif->drives[1]);
669 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
670 mdelay(2);
Marcello Maggioni284e4232005-05-26 15:47:35 +0200671 rc = ide_wait_not_busy(hwif, 35000);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672
673 /* Exit function with master reselected (let's be sane) */
674 SELECT_DRIVE(&hwif->drives[0]);
675
676 return rc;
677}
678
679/**
680 * ide_undecoded_slave - look for bad CF adapters
681 * @hwif: interface
682 *
683 * Analyse the drives on the interface and attempt to decide if we
684 * have the same drive viewed twice. This occurs with crap CF adapters
685 * and PCMCIA sometimes.
686 */
687
688void ide_undecoded_slave(ide_hwif_t *hwif)
689{
690 ide_drive_t *drive0 = &hwif->drives[0];
691 ide_drive_t *drive1 = &hwif->drives[1];
692
693 if (drive0->present == 0 || drive1->present == 0)
694 return;
695
696 /* If the models don't match they are not the same product */
697 if (strcmp(drive0->id->model, drive1->id->model))
698 return;
699
700 /* Serial numbers do not match */
701 if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
702 return;
703
704 /* No serial number, thankfully very rare for CF */
705 if (drive0->id->serial_no[0] == 0)
706 return;
707
708 /* Appears to be an IDE flash adapter with decode bugs */
709 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
710
711 drive1->present = 0;
712}
713
714EXPORT_SYMBOL_GPL(ide_undecoded_slave);
715
716/*
717 * This routine only knows how to look for drive units 0 and 1
718 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
719 */
Bartlomiej Zolnierkiewiczfd9bb532007-10-20 00:32:31 +0200720static void probe_hwif(ide_hwif_t *hwif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 unsigned long flags;
723 unsigned int irqd;
Bartlomiej Zolnierkiewiczb140b992007-10-13 17:47:51 +0200724 int unit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
726 if (hwif->noprobe)
727 return;
728
729 if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
730 (ide_hwif_request_regions(hwif))) {
731 u16 msgout = 0;
732 for (unit = 0; unit < MAX_DRIVES; ++unit) {
733 ide_drive_t *drive = &hwif->drives[unit];
734 if (drive->present) {
735 drive->present = 0;
736 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
737 drive->name);
738 msgout = 1;
739 }
740 }
741 if (!msgout)
742 printk(KERN_ERR "%s: ports already in use, skipping probe\n",
743 hwif->name);
744 return;
745 }
746
747 /*
748 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
749 * we'll install our IRQ driver much later...
750 */
751 irqd = hwif->irq;
752 if (irqd)
753 disable_irq(hwif->irq);
754
755 local_irq_set(flags);
756
757 /* This is needed on some PPCs and a bunch of BIOS-less embedded
758 * platforms. Typical cases are:
759 *
760 * - The firmware hard reset the disk before booting the kernel,
761 * the drive is still doing it's poweron-reset sequence, that
762 * can take up to 30 seconds
763 * - The firmware does nothing (or no firmware), the device is
764 * still in POST state (same as above actually).
765 * - Some CD/DVD/Writer combo drives tend to drive the bus during
766 * their reset sequence even when they are non-selected slave
767 * devices, thus preventing discovery of the main HD
768 *
769 * Doing this wait-for-busy should not harm any existing configuration
770 * (at least things won't be worse than what current code does, that
771 * is blindly go & talk to the drive) and fix some issues like the
772 * above.
773 *
774 * BenH.
775 */
776 if (wait_hwif_ready(hwif) == -EBUSY)
777 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
778
779 /*
Bartlomiej Zolnierkiewiczb140b992007-10-13 17:47:51 +0200780 * Need to probe slave device first to make it release PDIAG-.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 */
Bartlomiej Zolnierkiewiczb140b992007-10-13 17:47:51 +0200782 for (unit = MAX_DRIVES - 1; unit >= 0; unit--) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 ide_drive_t *drive = &hwif->drives[unit];
784 drive->dn = (hwif->channel ? 2 : 0) + unit;
785 (void) probe_for_drive(drive);
786 if (drive->present && !hwif->present) {
787 hwif->present = 1;
788 if (hwif->chipset != ide_4drives ||
789 !hwif->mate ||
790 !hwif->mate->present) {
791 hwif_register(hwif);
792 }
793 }
794 }
795 if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
796 unsigned long timeout = jiffies + WAIT_WORSTCASE;
797 u8 stat;
798
799 printk(KERN_WARNING "%s: reset\n", hwif->name);
800 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
801 udelay(10);
802 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
803 do {
804 msleep(50);
805 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
806 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
807
808 }
809 local_irq_restore(flags);
810 /*
811 * Use cached IRQ number. It might be (and is...) changed by probe
812 * code above
813 */
814 if (irqd)
815 enable_irq(irqd);
816
817 if (!hwif->present) {
818 ide_hwif_release_regions(hwif);
819 return;
820 }
821
Bartlomiej Zolnierkiewiczfd9bb532007-10-20 00:32:31 +0200822 if (hwif->fixup)
823 hwif->fixup(hwif);
Bartlomiej Zolnierkiewicz0380dad2007-06-08 15:14:29 +0200824
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 for (unit = 0; unit < MAX_DRIVES; ++unit) {
826 ide_drive_t *drive = &hwif->drives[unit];
827
828 if (drive->present) {
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200829 if (drive->autotune == IDE_TUNE_AUTO)
830 ide_set_max_pio(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831
832 if (drive->autotune != IDE_TUNE_DEFAULT &&
833 drive->autotune != IDE_TUNE_AUTO)
834 continue;
835
836 drive->nice1 = 1;
837
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200838 if (hwif->ide_dma_on) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 /*
840 * Force DMAing for the beginning of the check.
841 * Some chipsets appear to do interesting
842 * things, if not checked and cleared.
843 * PARANOIA!!!
844 */
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100845 hwif->dma_off_quietly(drive);
Bartlomiej Zolnierkiewicz8c0697c2007-10-16 22:29:58 +0200846 ide_set_dma(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 }
848 }
849 }
Kumar Gala208a08f2006-03-24 03:18:21 -0800850
851 for (unit = 0; unit < MAX_DRIVES; ++unit) {
852 ide_drive_t *drive = &hwif->drives[unit];
853
854 if (hwif->no_io_32bit)
855 drive->no_io_32bit = 1;
856 else
857 drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
858 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859}
860
861static int hwif_init(ide_hwif_t *hwif);
Bartlomiej Zolnierkiewicz9601a602007-10-20 00:32:29 +0200862static void hwif_register_devices(ide_hwif_t *hwif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863
Bartlomiej Zolnierkiewicz8447d9d2007-10-20 00:32:31 +0200864static int probe_hwif_init(ide_hwif_t *hwif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865{
Bartlomiej Zolnierkiewiczfd9bb532007-10-20 00:32:31 +0200866 probe_hwif(hwif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867
868 if (!hwif_init(hwif)) {
869 printk(KERN_INFO "%s: failed to initialize IDE interface\n",
870 hwif->name);
871 return -1;
872 }
873
Bartlomiej Zolnierkiewicz9601a602007-10-20 00:32:29 +0200874 if (hwif->present)
875 hwif_register_devices(hwif);
Randy Dunlap349ae232006-10-03 01:14:23 -0700876
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 return 0;
878}
879
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880#if MAX_HWIFS > 1
881/*
882 * save_match() is used to simplify logic in init_irq() below.
883 *
884 * A loophole here is that we may not know about a particular
885 * hwif's irq until after that hwif is actually probed/initialized..
886 * This could be a problem for the case where an hwif is on a
887 * dual interface that requires serialization (eg. cmd640) and another
888 * hwif using one of the same irqs is initialized beforehand.
889 *
890 * This routine detects and reports such situations, but does not fix them.
891 */
892static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
893{
894 ide_hwif_t *m = *match;
895
896 if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
897 if (!new->hwgroup)
898 return;
899 printk("%s: potential irq problem with %s and %s\n",
900 hwif->name, new->name, m->name);
901 }
902 if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
903 *match = new;
904}
905#endif /* MAX_HWIFS > 1 */
906
907/*
908 * init request queue
909 */
910static int ide_init_queue(ide_drive_t *drive)
911{
Jens Axboe165125e2007-07-24 09:28:11 +0200912 struct request_queue *q;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913 ide_hwif_t *hwif = HWIF(drive);
914 int max_sectors = 256;
915 int max_sg_entries = PRD_ENTRIES;
916
917 /*
918 * Our default set up assumes the normal IDE case,
919 * that is 64K segmenting, standard PRD setup
920 * and LBA28. Some drivers then impose their own
921 * limits and LBA48 we could raise it but as yet
922 * do not.
923 */
Christoph Lameter19460892005-06-23 00:08:19 -0700924
Ravikiran G Thirumalai556e58f2005-08-04 12:53:26 -0700925 q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 if (!q)
927 return 1;
928
929 q->queuedata = drive;
930 blk_queue_segment_boundary(q, 0xffff);
931
932 if (!hwif->rqsize) {
Bartlomiej Zolnierkiewicz238e4f12007-10-19 00:30:07 +0200933 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
934 (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 hwif->rqsize = 256;
936 else
937 hwif->rqsize = 65536;
938 }
939 if (hwif->rqsize < max_sectors)
940 max_sectors = hwif->rqsize;
941 blk_queue_max_sectors(q, max_sectors);
942
943#ifdef CONFIG_PCI
944 /* When we have an IOMMU, we may have a problem where pci_map_sg()
945 * creates segments that don't completely match our boundary
946 * requirements and thus need to be broken up again. Because it
947 * doesn't align properly either, we may actually have to break up
948 * to more segments than what was we got in the first place, a max
949 * worst case is twice as many.
950 * This will be fixed once we teach pci_map_sg() about our boundary
951 * requirements, hopefully soon. *FIXME*
952 */
953 if (!PCI_DMA_BUS_IS_PHYS)
954 max_sg_entries >>= 1;
955#endif /* CONFIG_PCI */
956
957 blk_queue_max_hw_segments(q, max_sg_entries);
958 blk_queue_max_phys_segments(q, max_sg_entries);
959
960 /* assign drive queue */
961 drive->queue = q;
962
963 /* needs drive->queue to be set */
964 ide_toggle_bounce(drive, 1);
965
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 return 0;
967}
968
969/*
970 * This routine sets up the irq for an ide interface, and creates a new
971 * hwgroup for the irq/hwif if none was previously assigned.
972 *
973 * Much of the code is for correctly detecting/handling irq sharing
974 * and irq serialization situations. This is somewhat complex because
975 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
976 *
Thomas Gleixner362537b2006-07-01 19:29:34 -0700977 * The IRQF_DISABLED in sa_flags means ide_intr() is always entered with
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 * interrupts completely disabled. This can be bad for interrupt latency,
979 * but anything else has led to problems on some machines. We re-enable
980 * interrupts as much as we can safely do in most places.
981 */
982static int init_irq (ide_hwif_t *hwif)
983{
984 unsigned int index;
985 ide_hwgroup_t *hwgroup;
986 ide_hwif_t *match = NULL;
987
988
989 BUG_ON(in_interrupt());
990 BUG_ON(irqs_disabled());
Ravikiran G Thirumalai556e58f2005-08-04 12:53:26 -0700991 BUG_ON(hwif == NULL);
992
Matthias Kaehlckeef298882007-07-09 23:17:55 +0200993 mutex_lock(&ide_cfg_mtx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 hwif->hwgroup = NULL;
995#if MAX_HWIFS > 1
996 /*
997 * Group up with any other hwifs that share our irq(s).
998 */
999 for (index = 0; index < MAX_HWIFS; index++) {
1000 ide_hwif_t *h = &ide_hwifs[index];
1001 if (h->hwgroup) { /* scan only initialized hwif's */
1002 if (hwif->irq == h->irq) {
1003 hwif->sharing_irq = h->sharing_irq = 1;
1004 if (hwif->chipset != ide_pci ||
1005 h->chipset != ide_pci) {
1006 save_match(hwif, h, &match);
1007 }
1008 }
1009 if (hwif->serialized) {
1010 if (hwif->mate && hwif->mate->irq == h->irq)
1011 save_match(hwif, h, &match);
1012 }
1013 if (h->serialized) {
1014 if (h->mate && hwif->irq == h->mate->irq)
1015 save_match(hwif, h, &match);
1016 }
1017 }
1018 }
1019#endif /* MAX_HWIFS > 1 */
1020 /*
1021 * If we are still without a hwgroup, then form a new one
1022 */
1023 if (match) {
1024 hwgroup = match->hwgroup;
1025 hwif->hwgroup = hwgroup;
1026 /*
1027 * Link us into the hwgroup.
1028 * This must be done early, do ensure that unexpected_intr
1029 * can find the hwif and prevent irq storms.
1030 * No drives are attached to the new hwif, choose_drive
1031 * can't do anything stupid (yet).
1032 * Add ourself as the 2nd entry to the hwgroup->hwif
1033 * linked list, the first entry is the hwif that owns
1034 * hwgroup->handler - do not change that.
1035 */
1036 spin_lock_irq(&ide_lock);
1037 hwif->next = hwgroup->hwif->next;
1038 hwgroup->hwif->next = hwif;
1039 spin_unlock_irq(&ide_lock);
1040 } else {
Christoph Lameter94f60302007-07-17 04:03:29 -07001041 hwgroup = kmalloc_node(sizeof(ide_hwgroup_t),
1042 GFP_KERNEL | __GFP_ZERO,
Ravikiran G Thirumalai556e58f2005-08-04 12:53:26 -07001043 hwif_to_node(hwif->drives[0].hwif));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 if (!hwgroup)
1045 goto out_up;
1046
1047 hwif->hwgroup = hwgroup;
1048
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 hwgroup->hwif = hwif->next = hwif;
1050 hwgroup->rq = NULL;
1051 hwgroup->handler = NULL;
1052 hwgroup->drive = NULL;
1053 hwgroup->busy = 0;
1054 init_timer(&hwgroup->timer);
1055 hwgroup->timer.function = &ide_timer_expiry;
1056 hwgroup->timer.data = (unsigned long) hwgroup;
1057 }
1058
1059 /*
1060 * Allocate the irq, if not already obtained for another hwif
1061 */
1062 if (!match || match->irq != hwif->irq) {
Thomas Gleixner362537b2006-07-01 19:29:34 -07001063 int sa = IRQF_DISABLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064#if defined(__mc68000__) || defined(CONFIG_APUS)
Thomas Gleixner362537b2006-07-01 19:29:34 -07001065 sa = IRQF_SHARED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066#endif /* __mc68000__ || CONFIG_APUS */
1067
1068 if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
Thomas Gleixner362537b2006-07-01 19:29:34 -07001069 sa = IRQF_SHARED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070#ifndef CONFIG_IDEPCI_SHARE_IRQ
Thomas Gleixner362537b2006-07-01 19:29:34 -07001071 sa |= IRQF_DISABLED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072#endif /* CONFIG_IDEPCI_SHARE_IRQ */
1073 }
1074
1075 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1076 /* clear nIEN */
1077 hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1078
1079 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1080 goto out_unlink;
1081 }
1082
1083 /*
1084 * For any present drive:
1085 * - allocate the block device queue
1086 * - link drive into the hwgroup
1087 */
1088 for (index = 0; index < MAX_DRIVES; ++index) {
1089 ide_drive_t *drive = &hwif->drives[index];
1090 if (!drive->present)
1091 continue;
1092 if (ide_init_queue(drive)) {
1093 printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1094 continue;
1095 }
1096 spin_lock_irq(&ide_lock);
1097 if (!hwgroup->drive) {
1098 /* first drive for hwgroup. */
1099 drive->next = drive;
1100 hwgroup->drive = drive;
1101 hwgroup->hwif = HWIF(hwgroup->drive);
1102 } else {
1103 drive->next = hwgroup->drive->next;
1104 hwgroup->drive->next = drive;
1105 }
1106 spin_unlock_irq(&ide_lock);
1107 }
1108
David S. Millerc6387a42006-06-20 01:21:29 -07001109#if !defined(__mc68000__) && !defined(CONFIG_APUS)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1111 hwif->io_ports[IDE_DATA_OFFSET],
1112 hwif->io_ports[IDE_DATA_OFFSET]+7,
1113 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114#else
1115 printk("%s at 0x%08lx on irq %d", hwif->name,
1116 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1117#endif /* __mc68000__ && CONFIG_APUS */
1118 if (match)
1119 printk(" (%sed with %s)",
1120 hwif->sharing_irq ? "shar" : "serializ", match->name);
1121 printk("\n");
Matthias Kaehlckeef298882007-07-09 23:17:55 +02001122 mutex_unlock(&ide_cfg_mtx);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 return 0;
1124out_unlink:
1125 spin_lock_irq(&ide_lock);
1126 if (hwif->next == hwif) {
1127 BUG_ON(match);
1128 BUG_ON(hwgroup->hwif != hwif);
1129 kfree(hwgroup);
1130 } else {
1131 ide_hwif_t *g;
1132 g = hwgroup->hwif;
1133 while (g->next != hwif)
1134 g = g->next;
1135 g->next = hwif->next;
1136 if (hwgroup->hwif == hwif) {
1137 /* Impossible. */
1138 printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1139 hwgroup->hwif = g;
1140 }
1141 BUG_ON(hwgroup->hwif == hwif);
1142 }
1143 spin_unlock_irq(&ide_lock);
1144out_up:
Matthias Kaehlckeef298882007-07-09 23:17:55 +02001145 mutex_unlock(&ide_cfg_mtx);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 return 1;
1147}
1148
1149static int ata_lock(dev_t dev, void *data)
1150{
1151 /* FIXME: we want to pin hwif down */
1152 return 0;
1153}
1154
1155static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1156{
1157 ide_hwif_t *hwif = data;
1158 int unit = *part >> PARTN_BITS;
1159 ide_drive_t *drive = &hwif->drives[unit];
1160 if (!drive->present)
1161 return NULL;
1162
1163 if (drive->media == ide_disk)
1164 request_module("ide-disk");
1165 if (drive->scsi)
1166 request_module("ide-scsi");
1167 if (drive->media == ide_cdrom || drive->media == ide_optical)
1168 request_module("ide-cd");
1169 if (drive->media == ide_tape)
1170 request_module("ide-tape");
1171 if (drive->media == ide_floppy)
1172 request_module("ide-floppy");
1173
1174 return NULL;
1175}
1176
1177static struct kobject *exact_match(dev_t dev, int *part, void *data)
1178{
1179 struct gendisk *p = data;
1180 *part &= (1 << PARTN_BITS) - 1;
1181 return &p->kobj;
1182}
1183
1184static int exact_lock(dev_t dev, void *data)
1185{
1186 struct gendisk *p = data;
1187
1188 if (!get_disk(p))
1189 return -1;
1190 return 0;
1191}
1192
1193void ide_register_region(struct gendisk *disk)
1194{
1195 blk_register_region(MKDEV(disk->major, disk->first_minor),
1196 disk->minors, NULL, exact_match, exact_lock, disk);
1197}
1198
1199EXPORT_SYMBOL_GPL(ide_register_region);
1200
1201void ide_unregister_region(struct gendisk *disk)
1202{
1203 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1204 disk->minors);
1205}
1206
1207EXPORT_SYMBOL_GPL(ide_unregister_region);
1208
1209void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1210{
1211 ide_hwif_t *hwif = drive->hwif;
1212 unsigned int unit = (drive->select.all >> 4) & 1;
1213
1214 disk->major = hwif->major;
1215 disk->first_minor = unit << PARTN_BITS;
1216 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1217 disk->queue = drive->queue;
1218}
1219
1220EXPORT_SYMBOL_GPL(ide_init_disk);
1221
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001222static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1223{
1224 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1225
1226 if (drive == drive->next) {
1227 /* special case: last drive from hwgroup. */
1228 BUG_ON(hwgroup->drive != drive);
1229 hwgroup->drive = NULL;
1230 } else {
1231 ide_drive_t *walk;
1232
1233 walk = hwgroup->drive;
1234 while (walk->next != drive)
1235 walk = walk->next;
1236 walk->next = drive->next;
1237 if (hwgroup->drive == drive) {
1238 hwgroup->drive = drive->next;
1239 hwgroup->hwif = hwgroup->drive->hwif;
1240 }
1241 }
1242 BUG_ON(hwgroup->drive == drive);
1243}
1244
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245static void drive_release_dev (struct device *dev)
1246{
1247 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1248
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001249 spin_lock_irq(&ide_lock);
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001250 ide_remove_drive_from_hwgroup(drive);
Jesper Juhl6044ec82005-11-07 01:01:32 -08001251 kfree(drive->id);
1252 drive->id = NULL;
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001253 drive->present = 0;
1254 /* Messed up locking ... */
1255 spin_unlock_irq(&ide_lock);
1256 blk_cleanup_queue(drive->queue);
1257 spin_lock_irq(&ide_lock);
1258 drive->queue = NULL;
1259 spin_unlock_irq(&ide_lock);
1260
Aleksey Makarovf36d4022006-01-09 15:59:27 -08001261 complete(&drive->gendev_rel_comp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262}
1263
1264/*
1265 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1266 * after probing for drives, to allocate partition tables and other data
1267 * structures needed for the routines in genhd.c. ide_geninit() gets called
1268 * somewhat later, during the partition check.
1269 */
1270static void init_gendisk (ide_hwif_t *hwif)
1271{
1272 unsigned int unit;
1273
1274 for (unit = 0; unit < MAX_DRIVES; ++unit) {
1275 ide_drive_t * drive = &hwif->drives[unit];
1276 ide_add_generic_settings(drive);
1277 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1278 hwif->index,unit);
1279 drive->gendev.parent = &hwif->gendev;
1280 drive->gendev.bus = &ide_bus_type;
1281 drive->gendev.driver_data = drive;
1282 drive->gendev.release = drive_release_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283 }
1284 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1285 THIS_MODULE, ata_probe, ata_lock, hwif);
1286}
1287
1288static int hwif_init(ide_hwif_t *hwif)
1289{
1290 int old_irq;
1291
1292 /* Return success if no device is connected */
1293 if (!hwif->present)
1294 return 1;
1295
1296 if (!hwif->irq) {
1297 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1298 {
1299 printk("%s: DISABLED, NO IRQ\n", hwif->name);
1300 return (hwif->present = 0);
1301 }
1302 }
1303#ifdef CONFIG_BLK_DEV_HD
1304 if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1305 printk("%s: CANNOT SHARE IRQ WITH OLD "
1306 "HARDDISK DRIVER (hd.c)\n", hwif->name);
1307 return (hwif->present = 0);
1308 }
1309#endif /* CONFIG_BLK_DEV_HD */
1310
1311 /* we set it back to 1 if all is ok below */
1312 hwif->present = 0;
1313
1314 if (register_blkdev(hwif->major, hwif->name))
1315 return 0;
1316
1317 if (!hwif->sg_max_nents)
1318 hwif->sg_max_nents = PRD_ENTRIES;
1319
Jens Axboe55c16a72007-07-25 08:13:56 +02001320 hwif->sg_table = kzalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 GFP_KERNEL);
1322 if (!hwif->sg_table) {
1323 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1324 goto out;
1325 }
1326
1327 if (init_irq(hwif) == 0)
1328 goto done;
1329
1330 old_irq = hwif->irq;
1331 /*
1332 * It failed to initialise. Find the default IRQ for
1333 * this port and try that.
1334 */
1335 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1336 printk("%s: Disabled unable to get IRQ %d.\n",
1337 hwif->name, old_irq);
1338 goto out;
1339 }
1340 if (init_irq(hwif)) {
1341 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1342 hwif->name, old_irq, hwif->irq);
1343 goto out;
1344 }
1345 printk("%s: probed IRQ %d failed, using default.\n",
1346 hwif->name, hwif->irq);
1347
1348done:
1349 init_gendisk(hwif);
Hannes Reineckee3a59b42007-02-07 18:19:37 +01001350
1351 ide_acpi_init(hwif);
1352
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353 hwif->present = 1; /* success */
1354 return 1;
1355
1356out:
1357 unregister_blkdev(hwif->major, hwif->name);
1358 return 0;
1359}
1360
Bartlomiej Zolnierkiewicz9601a602007-10-20 00:32:29 +02001361static void hwif_register_devices(ide_hwif_t *hwif)
1362{
1363 unsigned int i;
1364
1365 for (i = 0; i < MAX_DRIVES; i++) {
1366 ide_drive_t *drive = &hwif->drives[i];
1367
1368 if (drive->present) {
1369 int ret = device_register(&drive->gendev);
1370
1371 if (ret < 0)
1372 printk(KERN_WARNING "IDE: %s: "
1373 "device_register error: %d\n",
1374 __FUNCTION__, ret);
1375 }
1376 }
1377}
1378
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379int ideprobe_init (void)
1380{
1381 unsigned int index;
1382 int probe[MAX_HWIFS];
1383
1384 memset(probe, 0, MAX_HWIFS * sizeof(int));
1385 for (index = 0; index < MAX_HWIFS; ++index)
1386 probe[index] = !ide_hwifs[index].present;
1387
1388 for (index = 0; index < MAX_HWIFS; ++index)
1389 if (probe[index])
Bartlomiej Zolnierkiewiczfd9bb532007-10-20 00:32:31 +02001390 probe_hwif(&ide_hwifs[index]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 for (index = 0; index < MAX_HWIFS; ++index)
1392 if (probe[index])
1393 hwif_init(&ide_hwifs[index]);
1394 for (index = 0; index < MAX_HWIFS; ++index) {
1395 if (probe[index]) {
1396 ide_hwif_t *hwif = &ide_hwifs[index];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397 if (!hwif->present)
1398 continue;
1399 if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1400 hwif->chipset = ide_generic;
Bartlomiej Zolnierkiewicz9601a602007-10-20 00:32:29 +02001401 hwif_register_devices(hwif);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 }
1403 }
Bartlomiej Zolnierkiewicz5cbf79c2007-05-10 00:01:11 +02001404 for (index = 0; index < MAX_HWIFS; ++index)
1405 if (probe[index])
1406 ide_proc_register_port(&ide_hwifs[index]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 return 0;
1408}
1409
1410EXPORT_SYMBOL_GPL(ideprobe_init);
Bartlomiej Zolnierkiewicz8447d9d2007-10-20 00:32:31 +02001411
1412int ide_device_add(u8 idx[4])
1413{
1414 int i, rc = 0;
1415
1416 for (i = 0; i < 4; i++) {
1417 if (idx[i] != 0xff)
1418 rc |= probe_hwif_init(&ide_hwifs[idx[i]]);
1419 }
1420
1421 for (i = 0; i < 4; i++) {
1422 if (idx[i] != 0xff)
1423 ide_proc_register_port(&ide_hwifs[idx[i]]);
1424 }
1425
1426 return rc;
1427}
1428
1429EXPORT_SYMBOL_GPL(ide_device_add);