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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 *
Bartlomiej Zolnierkiewiczbbe4d6d2007-12-12 23:32:00 +010016 * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
17 * by Andrea Arcangeli
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 */
19
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/module.h>
21#include <linux/types.h>
22#include <linux/string.h>
23#include <linux/kernel.h>
24#include <linux/timer.h>
25#include <linux/mm.h>
26#include <linux/interrupt.h>
27#include <linux/major.h>
28#include <linux/errno.h>
29#include <linux/genhd.h>
30#include <linux/slab.h>
31#include <linux/delay.h>
32#include <linux/ide.h>
33#include <linux/spinlock.h>
34#include <linux/kmod.h>
35#include <linux/pci.h>
FUJITA Tomonoridc817852007-10-23 09:29:58 +020036#include <linux/scatterlist.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38#include <asm/byteorder.h>
39#include <asm/irq.h>
40#include <asm/uaccess.h>
41#include <asm/io.h>
42
43/**
44 * generic_id - add a generic drive id
45 * @drive: drive to make an ID block for
46 *
47 * Add a fake id field to the drive we are passed. This allows
48 * use to skip a ton of NULL checks (which people always miss)
49 * and make drive properties unconditional outside of this file
50 */
51
52static void generic_id(ide_drive_t *drive)
53{
54 drive->id->cyls = drive->cyl;
55 drive->id->heads = drive->head;
56 drive->id->sectors = drive->sect;
57 drive->id->cur_cyls = drive->cyl;
58 drive->id->cur_heads = drive->head;
59 drive->id->cur_sectors = drive->sect;
60}
61
62static void ide_disk_init_chs(ide_drive_t *drive)
63{
64 struct hd_driveid *id = drive->id;
65
66 /* Extract geometry if we did not already have one for the drive */
67 if (!drive->cyl || !drive->head || !drive->sect) {
68 drive->cyl = drive->bios_cyl = id->cyls;
69 drive->head = drive->bios_head = id->heads;
70 drive->sect = drive->bios_sect = id->sectors;
71 }
72
73 /* Handle logical geometry translation by the drive */
74 if ((id->field_valid & 1) && id->cur_cyls &&
75 id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
76 drive->cyl = id->cur_cyls;
77 drive->head = id->cur_heads;
78 drive->sect = id->cur_sectors;
79 }
80
81 /* Use physical geometry if what we have still makes no sense */
82 if (drive->head > 16 && id->heads && id->heads <= 16) {
83 drive->cyl = id->cyls;
84 drive->head = id->heads;
85 drive->sect = id->sectors;
86 }
87}
88
89static void ide_disk_init_mult_count(ide_drive_t *drive)
90{
91 struct hd_driveid *id = drive->id;
92
93 drive->mult_count = 0;
94 if (id->max_multsect) {
95#ifdef CONFIG_IDEDISK_MULTI_MODE
96 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
97 id->multsect_valid = id->multsect ? 1 : 0;
Bartlomiej Zolnierkiewicz4ee06b72008-01-25 22:17:08 +010098 drive->mult_req = id->multsect_valid ? id->max_multsect : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
100#else /* original, pre IDE-NFG, per request of AC */
Bartlomiej Zolnierkiewicz4ee06b72008-01-25 22:17:08 +0100101 drive->mult_req = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 if (drive->mult_req > id->max_multsect)
103 drive->mult_req = id->max_multsect;
104 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
105 drive->special.b.set_multmode = 1;
106#endif
107 }
108}
109
110/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 * do_identify - identify a drive
112 * @drive: drive to identify
113 * @cmd: command used
114 *
115 * Called when we have issued a drive identify command to
116 * read and parse the results. This function is run with
117 * interrupts disabled.
118 */
119
120static inline void do_identify (ide_drive_t *drive, u8 cmd)
121{
122 ide_hwif_t *hwif = HWIF(drive);
123 int bswap = 1;
124 struct hd_driveid *id;
125
126 id = drive->id;
127 /* read 512 bytes of id info */
128 hwif->ata_input_data(drive, id, SECTOR_WORDS);
129
130 drive->id_read = 1;
131 local_irq_enable();
132 ide_fix_driveid(id);
133
Robert P. J. Daye71bc142007-07-09 23:17:57 +0200134#if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 /*
136 * EATA SCSI controllers do a hardware ATA emulation:
137 * Ignore them if there is a driver for them available.
138 */
139 if ((id->model[0] == 'P' && id->model[1] == 'M') ||
140 (id->model[0] == 'S' && id->model[1] == 'K')) {
141 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
142 goto err_misc;
143 }
Robert P. J. Daye71bc142007-07-09 23:17:57 +0200144#endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
146 /*
147 * WIN_IDENTIFY returns little-endian info,
148 * WIN_PIDENTIFY *usually* returns little-endian info.
149 */
150 if (cmd == WIN_PIDENTIFY) {
151 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
152 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
153 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
154 /* Vertos drives may still be weird */
155 bswap ^= 1;
156 }
157 ide_fixstring(id->model, sizeof(id->model), bswap);
158 ide_fixstring(id->fw_rev, sizeof(id->fw_rev), bswap);
159 ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
160
Tejun Heo699b0522007-11-05 21:42:25 +0100161 /* we depend on this a lot! */
162 id->model[sizeof(id->model)-1] = '\0';
163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 if (strstr(id->model, "E X A B Y T E N E S T"))
165 goto err_misc;
166
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 printk("%s: %s, ", drive->name, id->model);
168 drive->present = 1;
169 drive->dead = 0;
170
171 /*
172 * Check for an ATAPI device
173 */
174 if (cmd == WIN_PIDENTIFY) {
175 u8 type = (id->config >> 8) & 0x1f;
176 printk("ATAPI ");
177 switch (type) {
178 case ide_floppy:
179 if (!strstr(id->model, "CD-ROM")) {
180 if (!strstr(id->model, "oppy") &&
181 !strstr(id->model, "poyp") &&
182 !strstr(id->model, "ZIP"))
183 printk("cdrom or floppy?, assuming ");
184 if (drive->media != ide_cdrom) {
185 printk ("FLOPPY");
186 drive->removable = 1;
187 break;
188 }
189 }
190 /* Early cdrom models used zero */
191 type = ide_cdrom;
192 case ide_cdrom:
193 drive->removable = 1;
194#ifdef CONFIG_PPC
195 /* kludge for Apple PowerBook internal zip */
196 if (!strstr(id->model, "CD-ROM") &&
197 strstr(id->model, "ZIP")) {
198 printk ("FLOPPY");
199 type = ide_floppy;
200 break;
201 }
202#endif
203 printk ("CD/DVD-ROM");
204 break;
205 case ide_tape:
206 printk ("TAPE");
207 break;
208 case ide_optical:
209 printk ("OPTICAL");
210 drive->removable = 1;
211 break;
212 default:
213 printk("UNKNOWN (type %d)", type);
214 break;
215 }
216 printk (" drive\n");
217 drive->media = type;
218 /* an ATAPI device ignores DRDY */
219 drive->ready_stat = 0;
220 return;
221 }
222
223 /*
224 * Not an ATAPI device: looks like a "regular" hard disk
225 */
Richard Purdie98109332006-02-03 03:04:55 -0800226
227 /*
228 * 0x848a = CompactFlash device
229 * These are *not* removable in Linux definition of the term
230 */
231
232 if ((id->config != 0x848a) && (id->config & (1<<7)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 drive->removable = 1;
234
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 drive->media = ide_disk;
Richard Purdie98109332006-02-03 03:04:55 -0800236 printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 QUIRK_LIST(drive);
238 return;
239
240err_misc:
241 kfree(id);
242 drive->present = 0;
243 return;
244}
245
246/**
247 * actual_try_to_identify - send ata/atapi identify
248 * @drive: drive to identify
249 * @cmd: command to use
250 *
251 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
252 * and waits for a response. It also monitors irqs while this is
253 * happening, in hope of automatically determining which one is
254 * being used by the interface.
255 *
256 * Returns: 0 device was identified
257 * 1 device timed-out (no response to identify request)
258 * 2 device aborted the command (refused to identify itself)
259 */
260
261static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
262{
263 ide_hwif_t *hwif = HWIF(drive);
264 int rc;
265 unsigned long hd_status;
266 unsigned long timeout;
267 u8 s = 0, a = 0;
268
269 /* take a deep breath */
270 msleep(50);
271
272 if (IDE_CONTROL_REG) {
273 a = hwif->INB(IDE_ALTSTATUS_REG);
274 s = hwif->INB(IDE_STATUS_REG);
275 if ((a ^ s) & ~INDEX_STAT) {
276 printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
277 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
278 /* ancient Seagate drives, broken interfaces */
279 hd_status = IDE_STATUS_REG;
280 } else {
281 /* use non-intrusive polling */
282 hd_status = IDE_ALTSTATUS_REG;
283 }
284 } else
285 hd_status = IDE_STATUS_REG;
286
287 /* set features register for atapi
288 * identify command to be sure of reply
289 */
290 if ((cmd == WIN_PIDENTIFY))
291 /* disable dma & overlap */
292 hwif->OUTB(0, IDE_FEATURE_REG);
293
294 /* ask drive for ID */
295 hwif->OUTB(cmd, IDE_COMMAND_REG);
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 } while ((hwif->INB(hd_status)) & BUSY_STAT);
307
308 /* wait for IRQ and DRQ_STAT */
309 msleep(50);
310 if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
311 unsigned long flags;
312
313 /* local CPU only; some systems need this */
314 local_irq_save(flags);
315 /* drive returned ID */
316 do_identify(drive, cmd);
317 /* drive responded with ID */
318 rc = 0;
319 /* clear drive IRQ */
320 (void) hwif->INB(IDE_STATUS_REG);
321 local_irq_restore(flags);
322 } else {
323 /* drive refused ID */
324 rc = 2;
325 }
326 return rc;
327}
328
329/**
330 * try_to_identify - try to identify a drive
331 * @drive: drive to probe
332 * @cmd: command to use
333 *
334 * Issue the identify command and then do IRQ probing to
335 * complete the identification when needed by finding the
336 * IRQ the drive is attached to
337 */
338
339static int try_to_identify (ide_drive_t *drive, u8 cmd)
340{
341 ide_hwif_t *hwif = HWIF(drive);
342 int retval;
343 int autoprobe = 0;
344 unsigned long cookie = 0;
345
346 /*
347 * Disable device irq unless we need to
348 * probe for it. Otherwise we'll get spurious
349 * interrupts during the identify-phase that
350 * the irq handler isn't expecting.
351 */
352 if (IDE_CONTROL_REG) {
353 u8 ctl = drive->ctl | 2;
354 if (!hwif->irq) {
355 autoprobe = 1;
356 cookie = probe_irq_on();
357 /* enable device irq */
358 ctl &= ~2;
359 }
360 hwif->OUTB(ctl, IDE_CONTROL_REG);
361 }
362
363 retval = actual_try_to_identify(drive, cmd);
364
365 if (autoprobe) {
366 int irq;
367 /* mask device irq */
368 hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
369 /* clear drive IRQ */
370 (void) hwif->INB(IDE_STATUS_REG);
371 udelay(5);
372 irq = probe_irq_off(cookie);
373 if (!hwif->irq) {
374 if (irq > 0) {
375 hwif->irq = irq;
376 } else {
377 /* Mmmm.. multiple IRQs..
378 * don't know which was ours
379 */
380 printk("%s: IRQ probe failed (0x%lx)\n",
381 drive->name, cookie);
382 }
383 }
384 }
385 return retval;
386}
387
388
389/**
390 * do_probe - probe an IDE device
391 * @drive: drive to probe
392 * @cmd: command to use
393 *
394 * do_probe() has the difficult job of finding a drive if it exists,
395 * without getting hung up if it doesn't exist, without trampling on
396 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
397 *
398 * If a drive is "known" to exist (from CMOS or kernel parameters),
399 * but does not respond right away, the probe will "hang in there"
400 * for the maximum wait time (about 30 seconds), otherwise it will
401 * exit much more quickly.
402 *
403 * Returns: 0 device was identified
404 * 1 device timed-out (no response to identify request)
405 * 2 device aborted the command (refused to identify itself)
406 * 3 bad status from device (possible for ATAPI drives)
407 * 4 probe was not attempted because failure was obvious
408 */
409
410static int do_probe (ide_drive_t *drive, u8 cmd)
411{
412 int rc;
413 ide_hwif_t *hwif = HWIF(drive);
414
415 if (drive->present) {
416 /* avoid waiting for inappropriate probes */
417 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
418 return 4;
419 }
420#ifdef DEBUG
421 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
422 drive->name, drive->present, drive->media,
423 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
424#endif
425
426 /* needed for some systems
427 * (e.g. crw9624 as drive0 with disk as slave)
428 */
429 msleep(50);
430 SELECT_DRIVE(drive);
431 msleep(50);
432 if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
433 if (drive->select.b.unit != 0) {
434 /* exit with drive0 selected */
435 SELECT_DRIVE(&hwif->drives[0]);
436 /* allow BUSY_STAT to assert & clear */
437 msleep(50);
438 }
439 /* no i/f present: mmm.. this should be a 4 -ml */
440 return 3;
441 }
442
443 if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
444 drive->present || cmd == WIN_PIDENTIFY) {
445 /* send cmd and wait */
446 if ((rc = try_to_identify(drive, cmd))) {
447 /* failed: try again */
448 rc = try_to_identify(drive,cmd);
449 }
450 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
451 return 4;
452
453 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
454 ((drive->autotune == IDE_TUNE_DEFAULT) ||
455 (drive->autotune == IDE_TUNE_AUTO))) {
456 unsigned long timeout;
457 printk("%s: no response (status = 0x%02x), "
458 "resetting drive\n", drive->name,
459 hwif->INB(IDE_STATUS_REG));
460 msleep(50);
461 hwif->OUTB(drive->select.all, IDE_SELECT_REG);
462 msleep(50);
463 hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
464 timeout = jiffies;
465 while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
466 time_before(jiffies, timeout + WAIT_WORSTCASE))
467 msleep(50);
468 rc = try_to_identify(drive, cmd);
469 }
470 if (rc == 1)
471 printk("%s: no response (status = 0x%02x)\n",
472 drive->name, hwif->INB(IDE_STATUS_REG));
473 /* ensure drive irq is clear */
474 (void) hwif->INB(IDE_STATUS_REG);
475 } else {
476 /* not present or maybe ATAPI */
477 rc = 3;
478 }
479 if (drive->select.b.unit != 0) {
480 /* exit with drive0 selected */
481 SELECT_DRIVE(&hwif->drives[0]);
482 msleep(50);
483 /* ensure drive irq is clear */
484 (void) hwif->INB(IDE_STATUS_REG);
485 }
486 return rc;
487}
488
489/*
490 *
491 */
492static void enable_nest (ide_drive_t *drive)
493{
494 ide_hwif_t *hwif = HWIF(drive);
495 unsigned long timeout;
496
497 printk("%s: enabling %s -- ", hwif->name, drive->id->model);
498 SELECT_DRIVE(drive);
499 msleep(50);
500 hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
501 timeout = jiffies + WAIT_WORSTCASE;
502 do {
503 if (time_after(jiffies, timeout)) {
504 printk("failed (timeout)\n");
505 return;
506 }
507 msleep(50);
508 } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
509
510 msleep(50);
511
512 if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
513 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
514 } else {
515 printk("success\n");
516 }
517
518 /* if !(success||timed-out) */
519 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
520 /* look for ATAPI device */
521 (void) do_probe(drive, WIN_PIDENTIFY);
522 }
523}
524
525/**
526 * probe_for_drives - upper level drive probe
527 * @drive: drive to probe for
528 *
529 * probe_for_drive() tests for existence of a given drive using do_probe()
530 * and presents things to the user as needed.
531 *
532 * Returns: 0 no device was found
533 * 1 device was found (note: drive->present might
534 * still be 0)
535 */
536
537static inline u8 probe_for_drive (ide_drive_t *drive)
538{
539 /*
540 * In order to keep things simple we have an id
541 * block for all drives at all times. If the device
542 * is pre ATA or refuses ATA/ATAPI identify we
543 * will add faked data to this.
544 *
545 * Also note that 0 everywhere means "can't do X"
546 */
547
Deepak Saxenaf5e3c2f2005-11-07 01:01:25 -0800548 drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 drive->id_read = 0;
550 if(drive->id == NULL)
551 {
552 printk(KERN_ERR "ide: out of memory for id data.\n");
553 return 0;
554 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 strcpy(drive->id->model, "UNKNOWN");
556
557 /* skip probing? */
558 if (!drive->noprobe)
559 {
560 /* if !(success||timed-out) */
561 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
562 /* look for ATAPI device */
563 (void) do_probe(drive, WIN_PIDENTIFY);
564 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 if (!drive->present)
566 /* drive not found */
567 return 0;
Alan Cox78595572007-07-03 22:28:35 +0200568 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
569 enable_nest(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
571 /* identification failed? */
572 if (!drive->id_read) {
573 if (drive->media == ide_disk) {
574 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
575 drive->name, drive->cyl,
576 drive->head, drive->sect);
577 } else if (drive->media == ide_cdrom) {
578 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
579 } else {
580 /* nuke it */
581 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
582 drive->present = 0;
583 }
584 }
585 /* drive was found */
586 }
587 if(!drive->present)
588 return 0;
589 /* The drive wasn't being helpful. Add generic info only */
590 if (drive->id_read == 0) {
591 generic_id(drive);
592 return 1;
593 }
594
595 if (drive->media == ide_disk) {
596 ide_disk_init_chs(drive);
597 ide_disk_init_mult_count(drive);
598 }
599
600 return drive->present;
601}
602
603static void hwif_release_dev (struct device *dev)
604{
605 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
606
Aleksey Makarovf36d4022006-01-09 15:59:27 -0800607 complete(&hwif->gendev_rel_comp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608}
609
610static void hwif_register (ide_hwif_t *hwif)
611{
Randy Dunlap349ae232006-10-03 01:14:23 -0700612 int ret;
613
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 /* register with global device tree */
615 strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
616 hwif->gendev.driver_data = hwif;
617 if (hwif->gendev.parent == NULL) {
618 if (hwif->pci_dev)
619 hwif->gendev.parent = &hwif->pci_dev->dev;
620 else
621 /* Would like to do = &device_legacy */
622 hwif->gendev.parent = NULL;
623 }
624 hwif->gendev.release = hwif_release_dev;
Randy Dunlap349ae232006-10-03 01:14:23 -0700625 ret = device_register(&hwif->gendev);
626 if (ret < 0)
627 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
628 __FUNCTION__, ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629}
630
631static int wait_hwif_ready(ide_hwif_t *hwif)
632{
Jonas Stare82661052007-11-27 21:35:53 +0100633 int unit, rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634
635 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
636
637 /* Let HW settle down a bit from whatever init state we
638 * come from */
639 mdelay(2);
640
641 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
642 * I know of at least one disk who takes 31 seconds, I use 35
643 * here to be safe
644 */
645 rc = ide_wait_not_busy(hwif, 35000);
646 if (rc)
647 return rc;
648
649 /* Now make sure both master & slave are ready */
Jonas Stare82661052007-11-27 21:35:53 +0100650 for (unit = 0; unit < MAX_DRIVES; unit++) {
651 ide_drive_t *drive = &hwif->drives[unit];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652
Jonas Stare82661052007-11-27 21:35:53 +0100653 /* Ignore disks that we will not probe for later. */
654 if (!drive->noprobe || drive->present) {
655 SELECT_DRIVE(drive);
Bartlomiej Zolnierkiewiczad0e74d2007-12-12 23:31:57 +0100656 if (IDE_CONTROL_REG)
657 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
Jonas Stare82661052007-11-27 21:35:53 +0100658 mdelay(2);
659 rc = ide_wait_not_busy(hwif, 35000);
660 if (rc)
661 goto out;
662 } else
663 printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
664 drive->name);
665 }
666out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 /* Exit function with master reselected (let's be sane) */
Jonas Stare82661052007-11-27 21:35:53 +0100668 if (unit)
669 SELECT_DRIVE(&hwif->drives[0]);
670
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 return rc;
672}
673
674/**
675 * ide_undecoded_slave - look for bad CF adapters
676 * @hwif: interface
677 *
678 * Analyse the drives on the interface and attempt to decide if we
679 * have the same drive viewed twice. This occurs with crap CF adapters
680 * and PCMCIA sometimes.
681 */
682
683void ide_undecoded_slave(ide_hwif_t *hwif)
684{
685 ide_drive_t *drive0 = &hwif->drives[0];
686 ide_drive_t *drive1 = &hwif->drives[1];
687
688 if (drive0->present == 0 || drive1->present == 0)
689 return;
690
691 /* If the models don't match they are not the same product */
692 if (strcmp(drive0->id->model, drive1->id->model))
693 return;
694
695 /* Serial numbers do not match */
696 if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
697 return;
698
699 /* No serial number, thankfully very rare for CF */
700 if (drive0->id->serial_no[0] == 0)
701 return;
702
703 /* Appears to be an IDE flash adapter with decode bugs */
704 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
705
706 drive1->present = 0;
707}
708
709EXPORT_SYMBOL_GPL(ide_undecoded_slave);
710
711/*
712 * This routine only knows how to look for drive units 0 and 1
713 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
714 */
Bartlomiej Zolnierkiewiczfd9bb532007-10-20 00:32:31 +0200715static void probe_hwif(ide_hwif_t *hwif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 unsigned long flags;
718 unsigned int irqd;
Bartlomiej Zolnierkiewiczb140b992007-10-13 17:47:51 +0200719 int unit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720
721 if (hwif->noprobe)
722 return;
723
724 if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
725 (ide_hwif_request_regions(hwif))) {
726 u16 msgout = 0;
727 for (unit = 0; unit < MAX_DRIVES; ++unit) {
728 ide_drive_t *drive = &hwif->drives[unit];
729 if (drive->present) {
730 drive->present = 0;
731 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
732 drive->name);
733 msgout = 1;
734 }
735 }
736 if (!msgout)
737 printk(KERN_ERR "%s: ports already in use, skipping probe\n",
738 hwif->name);
739 return;
740 }
741
742 /*
743 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
744 * we'll install our IRQ driver much later...
745 */
746 irqd = hwif->irq;
747 if (irqd)
748 disable_irq(hwif->irq);
749
750 local_irq_set(flags);
751
752 /* This is needed on some PPCs and a bunch of BIOS-less embedded
753 * platforms. Typical cases are:
754 *
755 * - The firmware hard reset the disk before booting the kernel,
756 * the drive is still doing it's poweron-reset sequence, that
757 * can take up to 30 seconds
758 * - The firmware does nothing (or no firmware), the device is
759 * still in POST state (same as above actually).
760 * - Some CD/DVD/Writer combo drives tend to drive the bus during
761 * their reset sequence even when they are non-selected slave
762 * devices, thus preventing discovery of the main HD
763 *
764 * Doing this wait-for-busy should not harm any existing configuration
765 * (at least things won't be worse than what current code does, that
766 * is blindly go & talk to the drive) and fix some issues like the
767 * above.
768 *
769 * BenH.
770 */
771 if (wait_hwif_ready(hwif) == -EBUSY)
772 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
773
774 /*
Bartlomiej Zolnierkiewiczb140b992007-10-13 17:47:51 +0200775 * Need to probe slave device first to make it release PDIAG-.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 */
Bartlomiej Zolnierkiewiczb140b992007-10-13 17:47:51 +0200777 for (unit = MAX_DRIVES - 1; unit >= 0; unit--) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 ide_drive_t *drive = &hwif->drives[unit];
779 drive->dn = (hwif->channel ? 2 : 0) + unit;
780 (void) probe_for_drive(drive);
781 if (drive->present && !hwif->present) {
782 hwif->present = 1;
783 if (hwif->chipset != ide_4drives ||
784 !hwif->mate ||
785 !hwif->mate->present) {
786 hwif_register(hwif);
787 }
788 }
789 }
790 if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
791 unsigned long timeout = jiffies + WAIT_WORSTCASE;
792 u8 stat;
793
794 printk(KERN_WARNING "%s: reset\n", hwif->name);
795 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
796 udelay(10);
797 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
798 do {
799 msleep(50);
800 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
801 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
802
803 }
804 local_irq_restore(flags);
805 /*
806 * Use cached IRQ number. It might be (and is...) changed by probe
807 * code above
808 */
809 if (irqd)
810 enable_irq(irqd);
811
812 if (!hwif->present) {
813 ide_hwif_release_regions(hwif);
814 return;
815 }
816
Bartlomiej Zolnierkiewiczfd9bb532007-10-20 00:32:31 +0200817 if (hwif->fixup)
818 hwif->fixup(hwif);
Bartlomiej Zolnierkiewicz0380dad2007-06-08 15:14:29 +0200819
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 for (unit = 0; unit < MAX_DRIVES; ++unit) {
821 ide_drive_t *drive = &hwif->drives[unit];
822
823 if (drive->present) {
Bartlomiej Zolnierkiewicz26bcb872007-10-11 23:54:00 +0200824 if (drive->autotune == IDE_TUNE_AUTO)
825 ide_set_max_pio(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826
827 if (drive->autotune != IDE_TUNE_DEFAULT &&
828 drive->autotune != IDE_TUNE_AUTO)
829 continue;
830
831 drive->nice1 = 1;
832
Bartlomiej Zolnierkiewicz0ae2e172007-10-16 22:29:55 +0200833 if (hwif->ide_dma_on) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 /*
835 * Force DMAing for the beginning of the check.
836 * Some chipsets appear to do interesting
837 * things, if not checked and cleared.
838 * PARANOIA!!!
839 */
Bartlomiej Zolnierkiewicz7469aaf2007-02-17 02:40:26 +0100840 hwif->dma_off_quietly(drive);
Bartlomiej Zolnierkiewicz8c0697c2007-10-16 22:29:58 +0200841 ide_set_dma(drive);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 }
843 }
844 }
Kumar Gala208a08f2006-03-24 03:18:21 -0800845
846 for (unit = 0; unit < MAX_DRIVES; ++unit) {
847 ide_drive_t *drive = &hwif->drives[unit];
848
849 if (hwif->no_io_32bit)
850 drive->no_io_32bit = 1;
851 else
852 drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
853 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854}
855
856static int hwif_init(ide_hwif_t *hwif);
Bartlomiej Zolnierkiewicz9601a602007-10-20 00:32:29 +0200857static void hwif_register_devices(ide_hwif_t *hwif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858
Bartlomiej Zolnierkiewicz8447d9d2007-10-20 00:32:31 +0200859static int probe_hwif_init(ide_hwif_t *hwif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860{
Bartlomiej Zolnierkiewiczfd9bb532007-10-20 00:32:31 +0200861 probe_hwif(hwif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862
863 if (!hwif_init(hwif)) {
864 printk(KERN_INFO "%s: failed to initialize IDE interface\n",
865 hwif->name);
866 return -1;
867 }
868
Bartlomiej Zolnierkiewicz9601a602007-10-20 00:32:29 +0200869 if (hwif->present)
870 hwif_register_devices(hwif);
Randy Dunlap349ae232006-10-03 01:14:23 -0700871
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 return 0;
873}
874
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875#if MAX_HWIFS > 1
876/*
877 * save_match() is used to simplify logic in init_irq() below.
878 *
879 * A loophole here is that we may not know about a particular
880 * hwif's irq until after that hwif is actually probed/initialized..
881 * This could be a problem for the case where an hwif is on a
882 * dual interface that requires serialization (eg. cmd640) and another
883 * hwif using one of the same irqs is initialized beforehand.
884 *
885 * This routine detects and reports such situations, but does not fix them.
886 */
887static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
888{
889 ide_hwif_t *m = *match;
890
891 if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
892 if (!new->hwgroup)
893 return;
894 printk("%s: potential irq problem with %s and %s\n",
895 hwif->name, new->name, m->name);
896 }
897 if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
898 *match = new;
899}
900#endif /* MAX_HWIFS > 1 */
901
902/*
903 * init request queue
904 */
905static int ide_init_queue(ide_drive_t *drive)
906{
Jens Axboe165125e2007-07-24 09:28:11 +0200907 struct request_queue *q;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 ide_hwif_t *hwif = HWIF(drive);
909 int max_sectors = 256;
910 int max_sg_entries = PRD_ENTRIES;
911
912 /*
913 * Our default set up assumes the normal IDE case,
914 * that is 64K segmenting, standard PRD setup
915 * and LBA28. Some drivers then impose their own
916 * limits and LBA48 we could raise it but as yet
917 * do not.
918 */
Christoph Lameter19460892005-06-23 00:08:19 -0700919
Ravikiran G Thirumalai556e58f2005-08-04 12:53:26 -0700920 q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 if (!q)
922 return 1;
923
924 q->queuedata = drive;
925 blk_queue_segment_boundary(q, 0xffff);
926
927 if (!hwif->rqsize) {
Bartlomiej Zolnierkiewicz238e4f12007-10-19 00:30:07 +0200928 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
929 (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 hwif->rqsize = 256;
931 else
932 hwif->rqsize = 65536;
933 }
934 if (hwif->rqsize < max_sectors)
935 max_sectors = hwif->rqsize;
936 blk_queue_max_sectors(q, max_sectors);
937
938#ifdef CONFIG_PCI
939 /* When we have an IOMMU, we may have a problem where pci_map_sg()
940 * creates segments that don't completely match our boundary
941 * requirements and thus need to be broken up again. Because it
942 * doesn't align properly either, we may actually have to break up
943 * to more segments than what was we got in the first place, a max
944 * worst case is twice as many.
945 * This will be fixed once we teach pci_map_sg() about our boundary
946 * requirements, hopefully soon. *FIXME*
947 */
948 if (!PCI_DMA_BUS_IS_PHYS)
949 max_sg_entries >>= 1;
950#endif /* CONFIG_PCI */
951
952 blk_queue_max_hw_segments(q, max_sg_entries);
953 blk_queue_max_phys_segments(q, max_sg_entries);
954
955 /* assign drive queue */
956 drive->queue = q;
957
958 /* needs drive->queue to be set */
959 ide_toggle_bounce(drive, 1);
960
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 return 0;
962}
963
964/*
965 * This routine sets up the irq for an ide interface, and creates a new
966 * hwgroup for the irq/hwif if none was previously assigned.
967 *
968 * Much of the code is for correctly detecting/handling irq sharing
969 * and irq serialization situations. This is somewhat complex because
970 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 */
972static int init_irq (ide_hwif_t *hwif)
973{
974 unsigned int index;
975 ide_hwgroup_t *hwgroup;
976 ide_hwif_t *match = NULL;
977
978
979 BUG_ON(in_interrupt());
980 BUG_ON(irqs_disabled());
Ravikiran G Thirumalai556e58f2005-08-04 12:53:26 -0700981 BUG_ON(hwif == NULL);
982
Matthias Kaehlckeef298882007-07-09 23:17:55 +0200983 mutex_lock(&ide_cfg_mtx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 hwif->hwgroup = NULL;
985#if MAX_HWIFS > 1
986 /*
987 * Group up with any other hwifs that share our irq(s).
988 */
989 for (index = 0; index < MAX_HWIFS; index++) {
990 ide_hwif_t *h = &ide_hwifs[index];
991 if (h->hwgroup) { /* scan only initialized hwif's */
992 if (hwif->irq == h->irq) {
993 hwif->sharing_irq = h->sharing_irq = 1;
994 if (hwif->chipset != ide_pci ||
995 h->chipset != ide_pci) {
996 save_match(hwif, h, &match);
997 }
998 }
999 if (hwif->serialized) {
1000 if (hwif->mate && hwif->mate->irq == h->irq)
1001 save_match(hwif, h, &match);
1002 }
1003 if (h->serialized) {
1004 if (h->mate && hwif->irq == h->mate->irq)
1005 save_match(hwif, h, &match);
1006 }
1007 }
1008 }
1009#endif /* MAX_HWIFS > 1 */
1010 /*
1011 * If we are still without a hwgroup, then form a new one
1012 */
1013 if (match) {
1014 hwgroup = match->hwgroup;
1015 hwif->hwgroup = hwgroup;
1016 /*
1017 * Link us into the hwgroup.
1018 * This must be done early, do ensure that unexpected_intr
1019 * can find the hwif and prevent irq storms.
1020 * No drives are attached to the new hwif, choose_drive
1021 * can't do anything stupid (yet).
1022 * Add ourself as the 2nd entry to the hwgroup->hwif
1023 * linked list, the first entry is the hwif that owns
1024 * hwgroup->handler - do not change that.
1025 */
1026 spin_lock_irq(&ide_lock);
1027 hwif->next = hwgroup->hwif->next;
1028 hwgroup->hwif->next = hwif;
1029 spin_unlock_irq(&ide_lock);
1030 } else {
Christoph Lameter94f60302007-07-17 04:03:29 -07001031 hwgroup = kmalloc_node(sizeof(ide_hwgroup_t),
1032 GFP_KERNEL | __GFP_ZERO,
Ravikiran G Thirumalai556e58f2005-08-04 12:53:26 -07001033 hwif_to_node(hwif->drives[0].hwif));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 if (!hwgroup)
1035 goto out_up;
1036
1037 hwif->hwgroup = hwgroup;
1038
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 hwgroup->hwif = hwif->next = hwif;
1040 hwgroup->rq = NULL;
1041 hwgroup->handler = NULL;
1042 hwgroup->drive = NULL;
1043 hwgroup->busy = 0;
1044 init_timer(&hwgroup->timer);
1045 hwgroup->timer.function = &ide_timer_expiry;
1046 hwgroup->timer.data = (unsigned long) hwgroup;
1047 }
1048
1049 /*
1050 * Allocate the irq, if not already obtained for another hwif
1051 */
1052 if (!match || match->irq != hwif->irq) {
Bartlomiej Zolnierkiewicz7b5da4b2008-01-25 22:17:08 +01001053 int sa = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054#if defined(__mc68000__) || defined(CONFIG_APUS)
Thomas Gleixner362537b2006-07-01 19:29:34 -07001055 sa = IRQF_SHARED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056#endif /* __mc68000__ || CONFIG_APUS */
1057
Bartlomiej Zolnierkiewicz7b5da4b2008-01-25 22:17:08 +01001058 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
Thomas Gleixner362537b2006-07-01 19:29:34 -07001059 sa = IRQF_SHARED;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060
1061 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1062 /* clear nIEN */
1063 hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1064
1065 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1066 goto out_unlink;
1067 }
1068
1069 /*
1070 * For any present drive:
1071 * - allocate the block device queue
1072 * - link drive into the hwgroup
1073 */
1074 for (index = 0; index < MAX_DRIVES; ++index) {
1075 ide_drive_t *drive = &hwif->drives[index];
1076 if (!drive->present)
1077 continue;
1078 if (ide_init_queue(drive)) {
1079 printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1080 continue;
1081 }
1082 spin_lock_irq(&ide_lock);
1083 if (!hwgroup->drive) {
1084 /* first drive for hwgroup. */
1085 drive->next = drive;
1086 hwgroup->drive = drive;
1087 hwgroup->hwif = HWIF(hwgroup->drive);
1088 } else {
1089 drive->next = hwgroup->drive->next;
1090 hwgroup->drive->next = drive;
1091 }
1092 spin_unlock_irq(&ide_lock);
1093 }
1094
David S. Millerc6387a42006-06-20 01:21:29 -07001095#if !defined(__mc68000__) && !defined(CONFIG_APUS)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1097 hwif->io_ports[IDE_DATA_OFFSET],
1098 hwif->io_ports[IDE_DATA_OFFSET]+7,
1099 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100#else
1101 printk("%s at 0x%08lx on irq %d", hwif->name,
1102 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1103#endif /* __mc68000__ && CONFIG_APUS */
1104 if (match)
1105 printk(" (%sed with %s)",
1106 hwif->sharing_irq ? "shar" : "serializ", match->name);
1107 printk("\n");
Matthias Kaehlckeef298882007-07-09 23:17:55 +02001108 mutex_unlock(&ide_cfg_mtx);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 return 0;
1110out_unlink:
1111 spin_lock_irq(&ide_lock);
1112 if (hwif->next == hwif) {
1113 BUG_ON(match);
1114 BUG_ON(hwgroup->hwif != hwif);
1115 kfree(hwgroup);
1116 } else {
1117 ide_hwif_t *g;
1118 g = hwgroup->hwif;
1119 while (g->next != hwif)
1120 g = g->next;
1121 g->next = hwif->next;
1122 if (hwgroup->hwif == hwif) {
1123 /* Impossible. */
1124 printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1125 hwgroup->hwif = g;
1126 }
1127 BUG_ON(hwgroup->hwif == hwif);
1128 }
1129 spin_unlock_irq(&ide_lock);
1130out_up:
Matthias Kaehlckeef298882007-07-09 23:17:55 +02001131 mutex_unlock(&ide_cfg_mtx);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 return 1;
1133}
1134
1135static int ata_lock(dev_t dev, void *data)
1136{
1137 /* FIXME: we want to pin hwif down */
1138 return 0;
1139}
1140
1141static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1142{
1143 ide_hwif_t *hwif = data;
1144 int unit = *part >> PARTN_BITS;
1145 ide_drive_t *drive = &hwif->drives[unit];
1146 if (!drive->present)
1147 return NULL;
1148
1149 if (drive->media == ide_disk)
1150 request_module("ide-disk");
1151 if (drive->scsi)
1152 request_module("ide-scsi");
1153 if (drive->media == ide_cdrom || drive->media == ide_optical)
1154 request_module("ide-cd");
1155 if (drive->media == ide_tape)
1156 request_module("ide-tape");
1157 if (drive->media == ide_floppy)
1158 request_module("ide-floppy");
1159
1160 return NULL;
1161}
1162
1163static struct kobject *exact_match(dev_t dev, int *part, void *data)
1164{
1165 struct gendisk *p = data;
1166 *part &= (1 << PARTN_BITS) - 1;
Kay Sieversedfaa7c2007-05-21 22:08:01 +02001167 return &p->dev.kobj;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168}
1169
1170static int exact_lock(dev_t dev, void *data)
1171{
1172 struct gendisk *p = data;
1173
1174 if (!get_disk(p))
1175 return -1;
1176 return 0;
1177}
1178
1179void ide_register_region(struct gendisk *disk)
1180{
1181 blk_register_region(MKDEV(disk->major, disk->first_minor),
1182 disk->minors, NULL, exact_match, exact_lock, disk);
1183}
1184
1185EXPORT_SYMBOL_GPL(ide_register_region);
1186
1187void ide_unregister_region(struct gendisk *disk)
1188{
1189 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1190 disk->minors);
1191}
1192
1193EXPORT_SYMBOL_GPL(ide_unregister_region);
1194
1195void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1196{
1197 ide_hwif_t *hwif = drive->hwif;
1198 unsigned int unit = (drive->select.all >> 4) & 1;
1199
1200 disk->major = hwif->major;
1201 disk->first_minor = unit << PARTN_BITS;
1202 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1203 disk->queue = drive->queue;
1204}
1205
1206EXPORT_SYMBOL_GPL(ide_init_disk);
1207
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001208static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1209{
1210 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1211
1212 if (drive == drive->next) {
1213 /* special case: last drive from hwgroup. */
1214 BUG_ON(hwgroup->drive != drive);
1215 hwgroup->drive = NULL;
1216 } else {
1217 ide_drive_t *walk;
1218
1219 walk = hwgroup->drive;
1220 while (walk->next != drive)
1221 walk = walk->next;
1222 walk->next = drive->next;
1223 if (hwgroup->drive == drive) {
1224 hwgroup->drive = drive->next;
1225 hwgroup->hwif = hwgroup->drive->hwif;
1226 }
1227 }
1228 BUG_ON(hwgroup->drive == drive);
1229}
1230
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231static void drive_release_dev (struct device *dev)
1232{
1233 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1234
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001235 spin_lock_irq(&ide_lock);
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001236 ide_remove_drive_from_hwgroup(drive);
Jesper Juhl6044ec82005-11-07 01:01:32 -08001237 kfree(drive->id);
1238 drive->id = NULL;
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001239 drive->present = 0;
1240 /* Messed up locking ... */
1241 spin_unlock_irq(&ide_lock);
1242 blk_cleanup_queue(drive->queue);
1243 spin_lock_irq(&ide_lock);
1244 drive->queue = NULL;
1245 spin_unlock_irq(&ide_lock);
1246
Aleksey Makarovf36d4022006-01-09 15:59:27 -08001247 complete(&drive->gendev_rel_comp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248}
1249
1250/*
1251 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1252 * after probing for drives, to allocate partition tables and other data
1253 * structures needed for the routines in genhd.c. ide_geninit() gets called
1254 * somewhat later, during the partition check.
1255 */
1256static void init_gendisk (ide_hwif_t *hwif)
1257{
1258 unsigned int unit;
1259
1260 for (unit = 0; unit < MAX_DRIVES; ++unit) {
1261 ide_drive_t * drive = &hwif->drives[unit];
1262 ide_add_generic_settings(drive);
1263 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1264 hwif->index,unit);
1265 drive->gendev.parent = &hwif->gendev;
1266 drive->gendev.bus = &ide_bus_type;
1267 drive->gendev.driver_data = drive;
1268 drive->gendev.release = drive_release_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269 }
1270 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1271 THIS_MODULE, ata_probe, ata_lock, hwif);
1272}
1273
1274static int hwif_init(ide_hwif_t *hwif)
1275{
1276 int old_irq;
1277
1278 /* Return success if no device is connected */
1279 if (!hwif->present)
1280 return 1;
1281
1282 if (!hwif->irq) {
1283 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1284 {
1285 printk("%s: DISABLED, NO IRQ\n", hwif->name);
1286 return (hwif->present = 0);
1287 }
1288 }
1289#ifdef CONFIG_BLK_DEV_HD
1290 if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1291 printk("%s: CANNOT SHARE IRQ WITH OLD "
1292 "HARDDISK DRIVER (hd.c)\n", hwif->name);
1293 return (hwif->present = 0);
1294 }
1295#endif /* CONFIG_BLK_DEV_HD */
1296
1297 /* we set it back to 1 if all is ok below */
1298 hwif->present = 0;
1299
1300 if (register_blkdev(hwif->major, hwif->name))
1301 return 0;
1302
1303 if (!hwif->sg_max_nents)
1304 hwif->sg_max_nents = PRD_ENTRIES;
1305
Jens Axboe45711f12007-10-22 21:19:53 +02001306 hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 GFP_KERNEL);
1308 if (!hwif->sg_table) {
1309 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1310 goto out;
1311 }
Jens Axboe45711f12007-10-22 21:19:53 +02001312
1313 sg_init_table(hwif->sg_table, hwif->sg_max_nents);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314
1315 if (init_irq(hwif) == 0)
1316 goto done;
1317
1318 old_irq = hwif->irq;
1319 /*
1320 * It failed to initialise. Find the default IRQ for
1321 * this port and try that.
1322 */
1323 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1324 printk("%s: Disabled unable to get IRQ %d.\n",
1325 hwif->name, old_irq);
1326 goto out;
1327 }
1328 if (init_irq(hwif)) {
1329 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1330 hwif->name, old_irq, hwif->irq);
1331 goto out;
1332 }
1333 printk("%s: probed IRQ %d failed, using default.\n",
1334 hwif->name, hwif->irq);
1335
1336done:
1337 init_gendisk(hwif);
Hannes Reineckee3a59b42007-02-07 18:19:37 +01001338
1339 ide_acpi_init(hwif);
1340
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 hwif->present = 1; /* success */
1342 return 1;
1343
1344out:
1345 unregister_blkdev(hwif->major, hwif->name);
1346 return 0;
1347}
1348
Bartlomiej Zolnierkiewicz9601a602007-10-20 00:32:29 +02001349static void hwif_register_devices(ide_hwif_t *hwif)
1350{
1351 unsigned int i;
1352
1353 for (i = 0; i < MAX_DRIVES; i++) {
1354 ide_drive_t *drive = &hwif->drives[i];
1355
1356 if (drive->present) {
1357 int ret = device_register(&drive->gendev);
1358
1359 if (ret < 0)
1360 printk(KERN_WARNING "IDE: %s: "
1361 "device_register error: %d\n",
1362 __FUNCTION__, ret);
1363 }
1364 }
1365}
1366
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367int ideprobe_init (void)
1368{
1369 unsigned int index;
1370 int probe[MAX_HWIFS];
1371
1372 memset(probe, 0, MAX_HWIFS * sizeof(int));
1373 for (index = 0; index < MAX_HWIFS; ++index)
1374 probe[index] = !ide_hwifs[index].present;
1375
1376 for (index = 0; index < MAX_HWIFS; ++index)
1377 if (probe[index])
Bartlomiej Zolnierkiewiczfd9bb532007-10-20 00:32:31 +02001378 probe_hwif(&ide_hwifs[index]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 for (index = 0; index < MAX_HWIFS; ++index)
1380 if (probe[index])
1381 hwif_init(&ide_hwifs[index]);
1382 for (index = 0; index < MAX_HWIFS; ++index) {
1383 if (probe[index]) {
1384 ide_hwif_t *hwif = &ide_hwifs[index];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385 if (!hwif->present)
1386 continue;
1387 if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1388 hwif->chipset = ide_generic;
Bartlomiej Zolnierkiewicz9601a602007-10-20 00:32:29 +02001389 hwif_register_devices(hwif);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 }
1391 }
Bartlomiej Zolnierkiewicz5cbf79c2007-05-10 00:01:11 +02001392 for (index = 0; index < MAX_HWIFS; ++index)
1393 if (probe[index])
1394 ide_proc_register_port(&ide_hwifs[index]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 return 0;
1396}
1397
1398EXPORT_SYMBOL_GPL(ideprobe_init);
Bartlomiej Zolnierkiewicz8447d9d2007-10-20 00:32:31 +02001399
1400int ide_device_add(u8 idx[4])
1401{
1402 int i, rc = 0;
1403
1404 for (i = 0; i < 4; i++) {
1405 if (idx[i] != 0xff)
1406 rc |= probe_hwif_init(&ide_hwifs[idx[i]]);
1407 }
1408
1409 for (i = 0; i < 4; i++) {
1410 if (idx[i] != 0xff)
1411 ide_proc_register_port(&ide_hwifs[idx[i]]);
1412 }
1413
1414 return rc;
1415}
1416
1417EXPORT_SYMBOL_GPL(ide_device_add);