blob: 1b7b4c531bc290de2c40efb213a792b811b46172 [file] [log] [blame]
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
34#undef REALLY_SLOW_IO /* most systems can safely undef this */
35
36#include <linux/config.h>
37#include <linux/module.h>
38#include <linux/types.h>
39#include <linux/string.h>
40#include <linux/kernel.h>
41#include <linux/timer.h>
42#include <linux/mm.h>
43#include <linux/interrupt.h>
44#include <linux/major.h>
45#include <linux/errno.h>
46#include <linux/genhd.h>
47#include <linux/slab.h>
48#include <linux/delay.h>
49#include <linux/ide.h>
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +020050#include <linux/devfs_fs_kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include <linux/spinlock.h>
52#include <linux/kmod.h>
53#include <linux/pci.h>
54
55#include <asm/byteorder.h>
56#include <asm/irq.h>
57#include <asm/uaccess.h>
58#include <asm/io.h>
59
60/**
61 * generic_id - add a generic drive id
62 * @drive: drive to make an ID block for
63 *
64 * Add a fake id field to the drive we are passed. This allows
65 * use to skip a ton of NULL checks (which people always miss)
66 * and make drive properties unconditional outside of this file
67 */
68
69static void generic_id(ide_drive_t *drive)
70{
71 drive->id->cyls = drive->cyl;
72 drive->id->heads = drive->head;
73 drive->id->sectors = drive->sect;
74 drive->id->cur_cyls = drive->cyl;
75 drive->id->cur_heads = drive->head;
76 drive->id->cur_sectors = drive->sect;
77}
78
79static void ide_disk_init_chs(ide_drive_t *drive)
80{
81 struct hd_driveid *id = drive->id;
82
83 /* Extract geometry if we did not already have one for the drive */
84 if (!drive->cyl || !drive->head || !drive->sect) {
85 drive->cyl = drive->bios_cyl = id->cyls;
86 drive->head = drive->bios_head = id->heads;
87 drive->sect = drive->bios_sect = id->sectors;
88 }
89
90 /* Handle logical geometry translation by the drive */
91 if ((id->field_valid & 1) && id->cur_cyls &&
92 id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
93 drive->cyl = id->cur_cyls;
94 drive->head = id->cur_heads;
95 drive->sect = id->cur_sectors;
96 }
97
98 /* Use physical geometry if what we have still makes no sense */
99 if (drive->head > 16 && id->heads && id->heads <= 16) {
100 drive->cyl = id->cyls;
101 drive->head = id->heads;
102 drive->sect = id->sectors;
103 }
104}
105
106static void ide_disk_init_mult_count(ide_drive_t *drive)
107{
108 struct hd_driveid *id = drive->id;
109
110 drive->mult_count = 0;
111 if (id->max_multsect) {
112#ifdef CONFIG_IDEDISK_MULTI_MODE
113 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
114 id->multsect_valid = id->multsect ? 1 : 0;
115 drive->mult_req = id->multsect_valid ? id->max_multsect : INITIAL_MULT_COUNT;
116 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
117#else /* original, pre IDE-NFG, per request of AC */
118 drive->mult_req = INITIAL_MULT_COUNT;
119 if (drive->mult_req > id->max_multsect)
120 drive->mult_req = id->max_multsect;
121 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
122 drive->special.b.set_multmode = 1;
123#endif
124 }
125}
126
127/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 * do_identify - identify a drive
129 * @drive: drive to identify
130 * @cmd: command used
131 *
132 * Called when we have issued a drive identify command to
133 * read and parse the results. This function is run with
134 * interrupts disabled.
135 */
136
137static inline void do_identify (ide_drive_t *drive, u8 cmd)
138{
139 ide_hwif_t *hwif = HWIF(drive);
140 int bswap = 1;
141 struct hd_driveid *id;
142
143 id = drive->id;
144 /* read 512 bytes of id info */
145 hwif->ata_input_data(drive, id, SECTOR_WORDS);
146
147 drive->id_read = 1;
148 local_irq_enable();
149 ide_fix_driveid(id);
150
151#if defined (CONFIG_SCSI_EATA_DMA) || defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
152 /*
153 * EATA SCSI controllers do a hardware ATA emulation:
154 * Ignore them if there is a driver for them available.
155 */
156 if ((id->model[0] == 'P' && id->model[1] == 'M') ||
157 (id->model[0] == 'S' && id->model[1] == 'K')) {
158 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
159 goto err_misc;
160 }
161#endif /* CONFIG_SCSI_EATA_DMA || CONFIG_SCSI_EATA_PIO */
162
163 /*
164 * WIN_IDENTIFY returns little-endian info,
165 * WIN_PIDENTIFY *usually* returns little-endian info.
166 */
167 if (cmd == WIN_PIDENTIFY) {
168 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
169 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
170 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
171 /* Vertos drives may still be weird */
172 bswap ^= 1;
173 }
174 ide_fixstring(id->model, sizeof(id->model), bswap);
175 ide_fixstring(id->fw_rev, sizeof(id->fw_rev), bswap);
176 ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
177
178 if (strstr(id->model, "E X A B Y T E N E S T"))
179 goto err_misc;
180
181 /* we depend on this a lot! */
182 id->model[sizeof(id->model)-1] = '\0';
183 printk("%s: %s, ", drive->name, id->model);
184 drive->present = 1;
185 drive->dead = 0;
186
187 /*
188 * Check for an ATAPI device
189 */
190 if (cmd == WIN_PIDENTIFY) {
191 u8 type = (id->config >> 8) & 0x1f;
192 printk("ATAPI ");
193 switch (type) {
194 case ide_floppy:
195 if (!strstr(id->model, "CD-ROM")) {
196 if (!strstr(id->model, "oppy") &&
197 !strstr(id->model, "poyp") &&
198 !strstr(id->model, "ZIP"))
199 printk("cdrom or floppy?, assuming ");
200 if (drive->media != ide_cdrom) {
201 printk ("FLOPPY");
202 drive->removable = 1;
203 break;
204 }
205 }
206 /* Early cdrom models used zero */
207 type = ide_cdrom;
208 case ide_cdrom:
209 drive->removable = 1;
210#ifdef CONFIG_PPC
211 /* kludge for Apple PowerBook internal zip */
212 if (!strstr(id->model, "CD-ROM") &&
213 strstr(id->model, "ZIP")) {
214 printk ("FLOPPY");
215 type = ide_floppy;
216 break;
217 }
218#endif
219 printk ("CD/DVD-ROM");
220 break;
221 case ide_tape:
222 printk ("TAPE");
223 break;
224 case ide_optical:
225 printk ("OPTICAL");
226 drive->removable = 1;
227 break;
228 default:
229 printk("UNKNOWN (type %d)", type);
230 break;
231 }
232 printk (" drive\n");
233 drive->media = type;
234 /* an ATAPI device ignores DRDY */
235 drive->ready_stat = 0;
236 return;
237 }
238
239 /*
240 * Not an ATAPI device: looks like a "regular" hard disk
241 */
Richard Purdie98109332006-02-03 03:04:55 -0800242
243 /*
244 * 0x848a = CompactFlash device
245 * These are *not* removable in Linux definition of the term
246 */
247
248 if ((id->config != 0x848a) && (id->config & (1<<7)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 drive->removable = 1;
250
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 drive->media = ide_disk;
Richard Purdie98109332006-02-03 03:04:55 -0800252 printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 QUIRK_LIST(drive);
254 return;
255
256err_misc:
257 kfree(id);
258 drive->present = 0;
259 return;
260}
261
262/**
263 * actual_try_to_identify - send ata/atapi identify
264 * @drive: drive to identify
265 * @cmd: command to use
266 *
267 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
268 * and waits for a response. It also monitors irqs while this is
269 * happening, in hope of automatically determining which one is
270 * being used by the interface.
271 *
272 * Returns: 0 device was identified
273 * 1 device timed-out (no response to identify request)
274 * 2 device aborted the command (refused to identify itself)
275 */
276
277static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
278{
279 ide_hwif_t *hwif = HWIF(drive);
280 int rc;
281 unsigned long hd_status;
282 unsigned long timeout;
283 u8 s = 0, a = 0;
284
285 /* take a deep breath */
286 msleep(50);
287
288 if (IDE_CONTROL_REG) {
289 a = hwif->INB(IDE_ALTSTATUS_REG);
290 s = hwif->INB(IDE_STATUS_REG);
291 if ((a ^ s) & ~INDEX_STAT) {
292 printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
293 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
294 /* ancient Seagate drives, broken interfaces */
295 hd_status = IDE_STATUS_REG;
296 } else {
297 /* use non-intrusive polling */
298 hd_status = IDE_ALTSTATUS_REG;
299 }
300 } else
301 hd_status = IDE_STATUS_REG;
302
303 /* set features register for atapi
304 * identify command to be sure of reply
305 */
306 if ((cmd == WIN_PIDENTIFY))
307 /* disable dma & overlap */
308 hwif->OUTB(0, IDE_FEATURE_REG);
309
310 /* ask drive for ID */
311 hwif->OUTB(cmd, IDE_COMMAND_REG);
312
313 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
314 timeout += jiffies;
315 do {
316 if (time_after(jiffies, timeout)) {
317 /* drive timed-out */
318 return 1;
319 }
320 /* give drive a breather */
321 msleep(50);
322 } while ((hwif->INB(hd_status)) & BUSY_STAT);
323
324 /* wait for IRQ and DRQ_STAT */
325 msleep(50);
326 if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
327 unsigned long flags;
328
329 /* local CPU only; some systems need this */
330 local_irq_save(flags);
331 /* drive returned ID */
332 do_identify(drive, cmd);
333 /* drive responded with ID */
334 rc = 0;
335 /* clear drive IRQ */
336 (void) hwif->INB(IDE_STATUS_REG);
337 local_irq_restore(flags);
338 } else {
339 /* drive refused ID */
340 rc = 2;
341 }
342 return rc;
343}
344
345/**
346 * try_to_identify - try to identify a drive
347 * @drive: drive to probe
348 * @cmd: command to use
349 *
350 * Issue the identify command and then do IRQ probing to
351 * complete the identification when needed by finding the
352 * IRQ the drive is attached to
353 */
354
355static int try_to_identify (ide_drive_t *drive, u8 cmd)
356{
357 ide_hwif_t *hwif = HWIF(drive);
358 int retval;
359 int autoprobe = 0;
360 unsigned long cookie = 0;
361
362 /*
363 * Disable device irq unless we need to
364 * probe for it. Otherwise we'll get spurious
365 * interrupts during the identify-phase that
366 * the irq handler isn't expecting.
367 */
368 if (IDE_CONTROL_REG) {
369 u8 ctl = drive->ctl | 2;
370 if (!hwif->irq) {
371 autoprobe = 1;
372 cookie = probe_irq_on();
373 /* enable device irq */
374 ctl &= ~2;
375 }
376 hwif->OUTB(ctl, IDE_CONTROL_REG);
377 }
378
379 retval = actual_try_to_identify(drive, cmd);
380
381 if (autoprobe) {
382 int irq;
383 /* mask device irq */
384 hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
385 /* clear drive IRQ */
386 (void) hwif->INB(IDE_STATUS_REG);
387 udelay(5);
388 irq = probe_irq_off(cookie);
389 if (!hwif->irq) {
390 if (irq > 0) {
391 hwif->irq = irq;
392 } else {
393 /* Mmmm.. multiple IRQs..
394 * don't know which was ours
395 */
396 printk("%s: IRQ probe failed (0x%lx)\n",
397 drive->name, cookie);
398 }
399 }
400 }
401 return retval;
402}
403
404
405/**
406 * do_probe - probe an IDE device
407 * @drive: drive to probe
408 * @cmd: command to use
409 *
410 * do_probe() has the difficult job of finding a drive if it exists,
411 * without getting hung up if it doesn't exist, without trampling on
412 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
413 *
414 * If a drive is "known" to exist (from CMOS or kernel parameters),
415 * but does not respond right away, the probe will "hang in there"
416 * for the maximum wait time (about 30 seconds), otherwise it will
417 * exit much more quickly.
418 *
419 * Returns: 0 device was identified
420 * 1 device timed-out (no response to identify request)
421 * 2 device aborted the command (refused to identify itself)
422 * 3 bad status from device (possible for ATAPI drives)
423 * 4 probe was not attempted because failure was obvious
424 */
425
426static int do_probe (ide_drive_t *drive, u8 cmd)
427{
428 int rc;
429 ide_hwif_t *hwif = HWIF(drive);
430
431 if (drive->present) {
432 /* avoid waiting for inappropriate probes */
433 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
434 return 4;
435 }
436#ifdef DEBUG
437 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
438 drive->name, drive->present, drive->media,
439 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
440#endif
441
442 /* needed for some systems
443 * (e.g. crw9624 as drive0 with disk as slave)
444 */
445 msleep(50);
446 SELECT_DRIVE(drive);
447 msleep(50);
448 if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
449 if (drive->select.b.unit != 0) {
450 /* exit with drive0 selected */
451 SELECT_DRIVE(&hwif->drives[0]);
452 /* allow BUSY_STAT to assert & clear */
453 msleep(50);
454 }
455 /* no i/f present: mmm.. this should be a 4 -ml */
456 return 3;
457 }
458
459 if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
460 drive->present || cmd == WIN_PIDENTIFY) {
461 /* send cmd and wait */
462 if ((rc = try_to_identify(drive, cmd))) {
463 /* failed: try again */
464 rc = try_to_identify(drive,cmd);
465 }
466 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
467 return 4;
468
469 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
470 ((drive->autotune == IDE_TUNE_DEFAULT) ||
471 (drive->autotune == IDE_TUNE_AUTO))) {
472 unsigned long timeout;
473 printk("%s: no response (status = 0x%02x), "
474 "resetting drive\n", drive->name,
475 hwif->INB(IDE_STATUS_REG));
476 msleep(50);
477 hwif->OUTB(drive->select.all, IDE_SELECT_REG);
478 msleep(50);
479 hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
480 timeout = jiffies;
481 while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
482 time_before(jiffies, timeout + WAIT_WORSTCASE))
483 msleep(50);
484 rc = try_to_identify(drive, cmd);
485 }
486 if (rc == 1)
487 printk("%s: no response (status = 0x%02x)\n",
488 drive->name, hwif->INB(IDE_STATUS_REG));
489 /* ensure drive irq is clear */
490 (void) hwif->INB(IDE_STATUS_REG);
491 } else {
492 /* not present or maybe ATAPI */
493 rc = 3;
494 }
495 if (drive->select.b.unit != 0) {
496 /* exit with drive0 selected */
497 SELECT_DRIVE(&hwif->drives[0]);
498 msleep(50);
499 /* ensure drive irq is clear */
500 (void) hwif->INB(IDE_STATUS_REG);
501 }
502 return rc;
503}
504
505/*
506 *
507 */
508static void enable_nest (ide_drive_t *drive)
509{
510 ide_hwif_t *hwif = HWIF(drive);
511 unsigned long timeout;
512
513 printk("%s: enabling %s -- ", hwif->name, drive->id->model);
514 SELECT_DRIVE(drive);
515 msleep(50);
516 hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
517 timeout = jiffies + WAIT_WORSTCASE;
518 do {
519 if (time_after(jiffies, timeout)) {
520 printk("failed (timeout)\n");
521 return;
522 }
523 msleep(50);
524 } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
525
526 msleep(50);
527
528 if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
529 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
530 } else {
531 printk("success\n");
532 }
533
534 /* if !(success||timed-out) */
535 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
536 /* look for ATAPI device */
537 (void) do_probe(drive, WIN_PIDENTIFY);
538 }
539}
540
541/**
542 * probe_for_drives - upper level drive probe
543 * @drive: drive to probe for
544 *
545 * probe_for_drive() tests for existence of a given drive using do_probe()
546 * and presents things to the user as needed.
547 *
548 * Returns: 0 no device was found
549 * 1 device was found (note: drive->present might
550 * still be 0)
551 */
552
553static inline u8 probe_for_drive (ide_drive_t *drive)
554{
555 /*
556 * In order to keep things simple we have an id
557 * block for all drives at all times. If the device
558 * is pre ATA or refuses ATA/ATAPI identify we
559 * will add faked data to this.
560 *
561 * Also note that 0 everywhere means "can't do X"
562 */
563
Deepak Saxenaf5e3c2f2005-11-07 01:01:25 -0800564 drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 drive->id_read = 0;
566 if(drive->id == NULL)
567 {
568 printk(KERN_ERR "ide: out of memory for id data.\n");
569 return 0;
570 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 strcpy(drive->id->model, "UNKNOWN");
572
573 /* skip probing? */
574 if (!drive->noprobe)
575 {
576 /* if !(success||timed-out) */
577 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
578 /* look for ATAPI device */
579 (void) do_probe(drive, WIN_PIDENTIFY);
580 }
581 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
582 enable_nest(drive);
583 if (!drive->present)
584 /* drive not found */
585 return 0;
586
587 /* identification failed? */
588 if (!drive->id_read) {
589 if (drive->media == ide_disk) {
590 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
591 drive->name, drive->cyl,
592 drive->head, drive->sect);
593 } else if (drive->media == ide_cdrom) {
594 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
595 } else {
596 /* nuke it */
597 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
598 drive->present = 0;
599 }
600 }
601 /* drive was found */
602 }
603 if(!drive->present)
604 return 0;
605 /* The drive wasn't being helpful. Add generic info only */
606 if (drive->id_read == 0) {
607 generic_id(drive);
608 return 1;
609 }
610
611 if (drive->media == ide_disk) {
612 ide_disk_init_chs(drive);
613 ide_disk_init_mult_count(drive);
614 }
615
616 return drive->present;
617}
618
619static void hwif_release_dev (struct device *dev)
620{
621 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
622
Aleksey Makarovf36d4022006-01-09 15:59:27 -0800623 complete(&hwif->gendev_rel_comp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624}
625
626static void hwif_register (ide_hwif_t *hwif)
627{
628 /* register with global device tree */
629 strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
630 hwif->gendev.driver_data = hwif;
631 if (hwif->gendev.parent == NULL) {
632 if (hwif->pci_dev)
633 hwif->gendev.parent = &hwif->pci_dev->dev;
634 else
635 /* Would like to do = &device_legacy */
636 hwif->gendev.parent = NULL;
637 }
638 hwif->gendev.release = hwif_release_dev;
639 device_register(&hwif->gendev);
640}
641
642static int wait_hwif_ready(ide_hwif_t *hwif)
643{
644 int rc;
645
646 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
647
648 /* Let HW settle down a bit from whatever init state we
649 * come from */
650 mdelay(2);
651
652 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
653 * I know of at least one disk who takes 31 seconds, I use 35
654 * here to be safe
655 */
656 rc = ide_wait_not_busy(hwif, 35000);
657 if (rc)
658 return rc;
659
660 /* Now make sure both master & slave are ready */
661 SELECT_DRIVE(&hwif->drives[0]);
662 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
663 mdelay(2);
Marcello Maggioni284e4232005-05-26 15:47:35 +0200664 rc = ide_wait_not_busy(hwif, 35000);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 if (rc)
666 return rc;
667 SELECT_DRIVE(&hwif->drives[1]);
668 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
669 mdelay(2);
Marcello Maggioni284e4232005-05-26 15:47:35 +0200670 rc = ide_wait_not_busy(hwif, 35000);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671
672 /* Exit function with master reselected (let's be sane) */
673 SELECT_DRIVE(&hwif->drives[0]);
674
675 return rc;
676}
677
678/**
679 * ide_undecoded_slave - look for bad CF adapters
680 * @hwif: interface
681 *
682 * Analyse the drives on the interface and attempt to decide if we
683 * have the same drive viewed twice. This occurs with crap CF adapters
684 * and PCMCIA sometimes.
685 */
686
687void ide_undecoded_slave(ide_hwif_t *hwif)
688{
689 ide_drive_t *drive0 = &hwif->drives[0];
690 ide_drive_t *drive1 = &hwif->drives[1];
691
692 if (drive0->present == 0 || drive1->present == 0)
693 return;
694
695 /* If the models don't match they are not the same product */
696 if (strcmp(drive0->id->model, drive1->id->model))
697 return;
698
699 /* Serial numbers do not match */
700 if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
701 return;
702
703 /* No serial number, thankfully very rare for CF */
704 if (drive0->id->serial_no[0] == 0)
705 return;
706
707 /* Appears to be an IDE flash adapter with decode bugs */
708 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
709
710 drive1->present = 0;
711}
712
713EXPORT_SYMBOL_GPL(ide_undecoded_slave);
714
715/*
716 * This routine only knows how to look for drive units 0 and 1
717 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
718 */
719static void probe_hwif(ide_hwif_t *hwif)
720{
721 unsigned int unit;
722 unsigned long flags;
723 unsigned int irqd;
724
725 if (hwif->noprobe)
726 return;
727
728 if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
729 (ide_hwif_request_regions(hwif))) {
730 u16 msgout = 0;
731 for (unit = 0; unit < MAX_DRIVES; ++unit) {
732 ide_drive_t *drive = &hwif->drives[unit];
733 if (drive->present) {
734 drive->present = 0;
735 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
736 drive->name);
737 msgout = 1;
738 }
739 }
740 if (!msgout)
741 printk(KERN_ERR "%s: ports already in use, skipping probe\n",
742 hwif->name);
743 return;
744 }
745
746 /*
747 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
748 * we'll install our IRQ driver much later...
749 */
750 irqd = hwif->irq;
751 if (irqd)
752 disable_irq(hwif->irq);
753
754 local_irq_set(flags);
755
756 /* This is needed on some PPCs and a bunch of BIOS-less embedded
757 * platforms. Typical cases are:
758 *
759 * - The firmware hard reset the disk before booting the kernel,
760 * the drive is still doing it's poweron-reset sequence, that
761 * can take up to 30 seconds
762 * - The firmware does nothing (or no firmware), the device is
763 * still in POST state (same as above actually).
764 * - Some CD/DVD/Writer combo drives tend to drive the bus during
765 * their reset sequence even when they are non-selected slave
766 * devices, thus preventing discovery of the main HD
767 *
768 * Doing this wait-for-busy should not harm any existing configuration
769 * (at least things won't be worse than what current code does, that
770 * is blindly go & talk to the drive) and fix some issues like the
771 * above.
772 *
773 * BenH.
774 */
775 if (wait_hwif_ready(hwif) == -EBUSY)
776 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
777
778 /*
779 * Second drive should only exist if first drive was found,
780 * but a lot of cdrom drives are configured as single slaves.
781 */
782 for (unit = 0; unit < MAX_DRIVES; ++unit) {
783 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
822 for (unit = 0; unit < MAX_DRIVES; ++unit) {
823 ide_drive_t *drive = &hwif->drives[unit];
824
825 if (drive->present) {
826 if (hwif->tuneproc != NULL &&
827 drive->autotune == IDE_TUNE_AUTO)
828 /* auto-tune PIO mode */
829 hwif->tuneproc(drive, 255);
830
831 if (drive->autotune != IDE_TUNE_DEFAULT &&
832 drive->autotune != IDE_TUNE_AUTO)
833 continue;
834
835 drive->nice1 = 1;
836
837 /*
838 * MAJOR HACK BARF :-/
839 *
840 * FIXME: chipsets own this cruft!
841 */
842 /*
843 * Move here to prevent module loading clashing.
844 */
845 // drive->autodma = hwif->autodma;
846 if (hwif->ide_dma_check) {
847 /*
848 * Force DMAing for the beginning of the check.
849 * Some chipsets appear to do interesting
850 * things, if not checked and cleared.
851 * PARANOIA!!!
852 */
853 hwif->ide_dma_off_quietly(drive);
854#ifdef CONFIG_IDEDMA_ONLYDISK
855 if (drive->media == ide_disk)
856#endif
857 hwif->ide_dma_check(drive);
858 }
859 }
860 }
Kumar Gala208a08f2006-03-24 03:18:21 -0800861
862 for (unit = 0; unit < MAX_DRIVES; ++unit) {
863 ide_drive_t *drive = &hwif->drives[unit];
864
865 if (hwif->no_io_32bit)
866 drive->no_io_32bit = 1;
867 else
868 drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
869 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870}
871
872static int hwif_init(ide_hwif_t *hwif);
873
874int probe_hwif_init_with_fixup(ide_hwif_t *hwif, void (*fixup)(ide_hwif_t *hwif))
875{
876 probe_hwif(hwif);
877
878 if (fixup)
879 fixup(hwif);
880
881 if (!hwif_init(hwif)) {
882 printk(KERN_INFO "%s: failed to initialize IDE interface\n",
883 hwif->name);
884 return -1;
885 }
886
887 if (hwif->present) {
888 u16 unit = 0;
889 for (unit = 0; unit < MAX_DRIVES; ++unit) {
890 ide_drive_t *drive = &hwif->drives[unit];
891 /* For now don't attach absent drives, we may
892 want them on default or a new "empty" class
893 for hotplug reprobing ? */
894 if (drive->present) {
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +0200895 device_register(&drive->gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 }
897 }
898 }
899 return 0;
900}
901
902int probe_hwif_init(ide_hwif_t *hwif)
903{
904 return probe_hwif_init_with_fixup(hwif, NULL);
905}
906
907EXPORT_SYMBOL(probe_hwif_init);
908
909#if MAX_HWIFS > 1
910/*
911 * save_match() is used to simplify logic in init_irq() below.
912 *
913 * A loophole here is that we may not know about a particular
914 * hwif's irq until after that hwif is actually probed/initialized..
915 * This could be a problem for the case where an hwif is on a
916 * dual interface that requires serialization (eg. cmd640) and another
917 * hwif using one of the same irqs is initialized beforehand.
918 *
919 * This routine detects and reports such situations, but does not fix them.
920 */
921static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
922{
923 ide_hwif_t *m = *match;
924
925 if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
926 if (!new->hwgroup)
927 return;
928 printk("%s: potential irq problem with %s and %s\n",
929 hwif->name, new->name, m->name);
930 }
931 if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
932 *match = new;
933}
934#endif /* MAX_HWIFS > 1 */
935
936/*
937 * init request queue
938 */
939static int ide_init_queue(ide_drive_t *drive)
940{
941 request_queue_t *q;
942 ide_hwif_t *hwif = HWIF(drive);
943 int max_sectors = 256;
944 int max_sg_entries = PRD_ENTRIES;
945
946 /*
947 * Our default set up assumes the normal IDE case,
948 * that is 64K segmenting, standard PRD setup
949 * and LBA28. Some drivers then impose their own
950 * limits and LBA48 we could raise it but as yet
951 * do not.
952 */
Christoph Lameter19460892005-06-23 00:08:19 -0700953
Ravikiran G Thirumalai556e58f2005-08-04 12:53:26 -0700954 q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 if (!q)
956 return 1;
957
958 q->queuedata = drive;
959 blk_queue_segment_boundary(q, 0xffff);
960
961 if (!hwif->rqsize) {
962 if (hwif->no_lba48 || hwif->no_lba48_dma)
963 hwif->rqsize = 256;
964 else
965 hwif->rqsize = 65536;
966 }
967 if (hwif->rqsize < max_sectors)
968 max_sectors = hwif->rqsize;
969 blk_queue_max_sectors(q, max_sectors);
970
971#ifdef CONFIG_PCI
972 /* When we have an IOMMU, we may have a problem where pci_map_sg()
973 * creates segments that don't completely match our boundary
974 * requirements and thus need to be broken up again. Because it
975 * doesn't align properly either, we may actually have to break up
976 * to more segments than what was we got in the first place, a max
977 * worst case is twice as many.
978 * This will be fixed once we teach pci_map_sg() about our boundary
979 * requirements, hopefully soon. *FIXME*
980 */
981 if (!PCI_DMA_BUS_IS_PHYS)
982 max_sg_entries >>= 1;
983#endif /* CONFIG_PCI */
984
985 blk_queue_max_hw_segments(q, max_sg_entries);
986 blk_queue_max_phys_segments(q, max_sg_entries);
987
988 /* assign drive queue */
989 drive->queue = q;
990
991 /* needs drive->queue to be set */
992 ide_toggle_bounce(drive, 1);
993
994 /* enable led activity for disk drives only */
995 if (drive->media == ide_disk && hwif->led_act)
996 blk_queue_activity_fn(q, hwif->led_act, drive);
997
998 return 0;
999}
1000
1001/*
1002 * This routine sets up the irq for an ide interface, and creates a new
1003 * hwgroup for the irq/hwif if none was previously assigned.
1004 *
1005 * Much of the code is for correctly detecting/handling irq sharing
1006 * and irq serialization situations. This is somewhat complex because
1007 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1008 *
1009 * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
1010 * interrupts completely disabled. This can be bad for interrupt latency,
1011 * but anything else has led to problems on some machines. We re-enable
1012 * interrupts as much as we can safely do in most places.
1013 */
1014static int init_irq (ide_hwif_t *hwif)
1015{
1016 unsigned int index;
1017 ide_hwgroup_t *hwgroup;
1018 ide_hwif_t *match = NULL;
1019
1020
1021 BUG_ON(in_interrupt());
1022 BUG_ON(irqs_disabled());
Ravikiran G Thirumalai556e58f2005-08-04 12:53:26 -07001023 BUG_ON(hwif == NULL);
1024
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 down(&ide_cfg_sem);
1026 hwif->hwgroup = NULL;
1027#if MAX_HWIFS > 1
1028 /*
1029 * Group up with any other hwifs that share our irq(s).
1030 */
1031 for (index = 0; index < MAX_HWIFS; index++) {
1032 ide_hwif_t *h = &ide_hwifs[index];
1033 if (h->hwgroup) { /* scan only initialized hwif's */
1034 if (hwif->irq == h->irq) {
1035 hwif->sharing_irq = h->sharing_irq = 1;
1036 if (hwif->chipset != ide_pci ||
1037 h->chipset != ide_pci) {
1038 save_match(hwif, h, &match);
1039 }
1040 }
1041 if (hwif->serialized) {
1042 if (hwif->mate && hwif->mate->irq == h->irq)
1043 save_match(hwif, h, &match);
1044 }
1045 if (h->serialized) {
1046 if (h->mate && hwif->irq == h->mate->irq)
1047 save_match(hwif, h, &match);
1048 }
1049 }
1050 }
1051#endif /* MAX_HWIFS > 1 */
1052 /*
1053 * If we are still without a hwgroup, then form a new one
1054 */
1055 if (match) {
1056 hwgroup = match->hwgroup;
1057 hwif->hwgroup = hwgroup;
1058 /*
1059 * Link us into the hwgroup.
1060 * This must be done early, do ensure that unexpected_intr
1061 * can find the hwif and prevent irq storms.
1062 * No drives are attached to the new hwif, choose_drive
1063 * can't do anything stupid (yet).
1064 * Add ourself as the 2nd entry to the hwgroup->hwif
1065 * linked list, the first entry is the hwif that owns
1066 * hwgroup->handler - do not change that.
1067 */
1068 spin_lock_irq(&ide_lock);
1069 hwif->next = hwgroup->hwif->next;
1070 hwgroup->hwif->next = hwif;
1071 spin_unlock_irq(&ide_lock);
1072 } else {
Christoph Lameter19460892005-06-23 00:08:19 -07001073 hwgroup = kmalloc_node(sizeof(ide_hwgroup_t), GFP_KERNEL,
Ravikiran G Thirumalai556e58f2005-08-04 12:53:26 -07001074 hwif_to_node(hwif->drives[0].hwif));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 if (!hwgroup)
1076 goto out_up;
1077
1078 hwif->hwgroup = hwgroup;
1079
1080 memset(hwgroup, 0, sizeof(ide_hwgroup_t));
1081 hwgroup->hwif = hwif->next = hwif;
1082 hwgroup->rq = NULL;
1083 hwgroup->handler = NULL;
1084 hwgroup->drive = NULL;
1085 hwgroup->busy = 0;
1086 init_timer(&hwgroup->timer);
1087 hwgroup->timer.function = &ide_timer_expiry;
1088 hwgroup->timer.data = (unsigned long) hwgroup;
1089 }
1090
1091 /*
1092 * Allocate the irq, if not already obtained for another hwif
1093 */
1094 if (!match || match->irq != hwif->irq) {
1095 int sa = SA_INTERRUPT;
1096#if defined(__mc68000__) || defined(CONFIG_APUS)
1097 sa = SA_SHIRQ;
1098#endif /* __mc68000__ || CONFIG_APUS */
1099
1100 if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
1101 sa = SA_SHIRQ;
1102#ifndef CONFIG_IDEPCI_SHARE_IRQ
1103 sa |= SA_INTERRUPT;
1104#endif /* CONFIG_IDEPCI_SHARE_IRQ */
1105 }
1106
1107 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1108 /* clear nIEN */
1109 hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1110
1111 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1112 goto out_unlink;
1113 }
1114
1115 /*
1116 * For any present drive:
1117 * - allocate the block device queue
1118 * - link drive into the hwgroup
1119 */
1120 for (index = 0; index < MAX_DRIVES; ++index) {
1121 ide_drive_t *drive = &hwif->drives[index];
1122 if (!drive->present)
1123 continue;
1124 if (ide_init_queue(drive)) {
1125 printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1126 continue;
1127 }
1128 spin_lock_irq(&ide_lock);
1129 if (!hwgroup->drive) {
1130 /* first drive for hwgroup. */
1131 drive->next = drive;
1132 hwgroup->drive = drive;
1133 hwgroup->hwif = HWIF(hwgroup->drive);
1134 } else {
1135 drive->next = hwgroup->drive->next;
1136 hwgroup->drive->next = drive;
1137 }
1138 spin_unlock_irq(&ide_lock);
1139 }
1140
1141#if !defined(__mc68000__) && !defined(CONFIG_APUS) && !defined(__sparc__)
1142 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1143 hwif->io_ports[IDE_DATA_OFFSET],
1144 hwif->io_ports[IDE_DATA_OFFSET]+7,
1145 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1146#elif defined(__sparc__)
1147 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %s", hwif->name,
1148 hwif->io_ports[IDE_DATA_OFFSET],
1149 hwif->io_ports[IDE_DATA_OFFSET]+7,
1150 hwif->io_ports[IDE_CONTROL_OFFSET], __irq_itoa(hwif->irq));
1151#else
1152 printk("%s at 0x%08lx on irq %d", hwif->name,
1153 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1154#endif /* __mc68000__ && CONFIG_APUS */
1155 if (match)
1156 printk(" (%sed with %s)",
1157 hwif->sharing_irq ? "shar" : "serializ", match->name);
1158 printk("\n");
1159 up(&ide_cfg_sem);
1160 return 0;
1161out_unlink:
1162 spin_lock_irq(&ide_lock);
1163 if (hwif->next == hwif) {
1164 BUG_ON(match);
1165 BUG_ON(hwgroup->hwif != hwif);
1166 kfree(hwgroup);
1167 } else {
1168 ide_hwif_t *g;
1169 g = hwgroup->hwif;
1170 while (g->next != hwif)
1171 g = g->next;
1172 g->next = hwif->next;
1173 if (hwgroup->hwif == hwif) {
1174 /* Impossible. */
1175 printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1176 hwgroup->hwif = g;
1177 }
1178 BUG_ON(hwgroup->hwif == hwif);
1179 }
1180 spin_unlock_irq(&ide_lock);
1181out_up:
1182 up(&ide_cfg_sem);
1183 return 1;
1184}
1185
1186static int ata_lock(dev_t dev, void *data)
1187{
1188 /* FIXME: we want to pin hwif down */
1189 return 0;
1190}
1191
1192static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1193{
1194 ide_hwif_t *hwif = data;
1195 int unit = *part >> PARTN_BITS;
1196 ide_drive_t *drive = &hwif->drives[unit];
1197 if (!drive->present)
1198 return NULL;
1199
1200 if (drive->media == ide_disk)
1201 request_module("ide-disk");
1202 if (drive->scsi)
1203 request_module("ide-scsi");
1204 if (drive->media == ide_cdrom || drive->media == ide_optical)
1205 request_module("ide-cd");
1206 if (drive->media == ide_tape)
1207 request_module("ide-tape");
1208 if (drive->media == ide_floppy)
1209 request_module("ide-floppy");
1210
1211 return NULL;
1212}
1213
1214static struct kobject *exact_match(dev_t dev, int *part, void *data)
1215{
1216 struct gendisk *p = data;
1217 *part &= (1 << PARTN_BITS) - 1;
1218 return &p->kobj;
1219}
1220
1221static int exact_lock(dev_t dev, void *data)
1222{
1223 struct gendisk *p = data;
1224
1225 if (!get_disk(p))
1226 return -1;
1227 return 0;
1228}
1229
1230void ide_register_region(struct gendisk *disk)
1231{
1232 blk_register_region(MKDEV(disk->major, disk->first_minor),
1233 disk->minors, NULL, exact_match, exact_lock, disk);
1234}
1235
1236EXPORT_SYMBOL_GPL(ide_register_region);
1237
1238void ide_unregister_region(struct gendisk *disk)
1239{
1240 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1241 disk->minors);
1242}
1243
1244EXPORT_SYMBOL_GPL(ide_unregister_region);
1245
1246void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1247{
1248 ide_hwif_t *hwif = drive->hwif;
1249 unsigned int unit = (drive->select.all >> 4) & 1;
1250
1251 disk->major = hwif->major;
1252 disk->first_minor = unit << PARTN_BITS;
1253 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1254 disk->queue = drive->queue;
1255}
1256
1257EXPORT_SYMBOL_GPL(ide_init_disk);
1258
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001259static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1260{
1261 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1262
1263 if (drive == drive->next) {
1264 /* special case: last drive from hwgroup. */
1265 BUG_ON(hwgroup->drive != drive);
1266 hwgroup->drive = NULL;
1267 } else {
1268 ide_drive_t *walk;
1269
1270 walk = hwgroup->drive;
1271 while (walk->next != drive)
1272 walk = walk->next;
1273 walk->next = drive->next;
1274 if (hwgroup->drive == drive) {
1275 hwgroup->drive = drive->next;
1276 hwgroup->hwif = hwgroup->drive->hwif;
1277 }
1278 }
1279 BUG_ON(hwgroup->drive == drive);
1280}
1281
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282static void drive_release_dev (struct device *dev)
1283{
1284 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1285
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001286 spin_lock_irq(&ide_lock);
1287 if (drive->devfs_name[0] != '\0') {
1288 devfs_remove(drive->devfs_name);
1289 drive->devfs_name[0] = '\0';
1290 }
1291 ide_remove_drive_from_hwgroup(drive);
Jesper Juhl6044ec82005-11-07 01:01:32 -08001292 kfree(drive->id);
1293 drive->id = NULL;
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001294 drive->present = 0;
1295 /* Messed up locking ... */
1296 spin_unlock_irq(&ide_lock);
1297 blk_cleanup_queue(drive->queue);
1298 spin_lock_irq(&ide_lock);
1299 drive->queue = NULL;
1300 spin_unlock_irq(&ide_lock);
1301
Aleksey Makarovf36d4022006-01-09 15:59:27 -08001302 complete(&drive->gendev_rel_comp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303}
1304
1305/*
1306 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1307 * after probing for drives, to allocate partition tables and other data
1308 * structures needed for the routines in genhd.c. ide_geninit() gets called
1309 * somewhat later, during the partition check.
1310 */
1311static void init_gendisk (ide_hwif_t *hwif)
1312{
1313 unsigned int unit;
1314
1315 for (unit = 0; unit < MAX_DRIVES; ++unit) {
1316 ide_drive_t * drive = &hwif->drives[unit];
1317 ide_add_generic_settings(drive);
1318 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1319 hwif->index,unit);
1320 drive->gendev.parent = &hwif->gendev;
1321 drive->gendev.bus = &ide_bus_type;
1322 drive->gendev.driver_data = drive;
1323 drive->gendev.release = drive_release_dev;
1324 if (drive->present) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 sprintf(drive->devfs_name, "ide/host%d/bus%d/target%d/lun%d",
1326 (hwif->channel && hwif->mate) ?
1327 hwif->mate->index : hwif->index,
1328 hwif->channel, unit, drive->lun);
1329 }
1330 }
1331 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1332 THIS_MODULE, ata_probe, ata_lock, hwif);
1333}
1334
1335static int hwif_init(ide_hwif_t *hwif)
1336{
1337 int old_irq;
1338
1339 /* Return success if no device is connected */
1340 if (!hwif->present)
1341 return 1;
1342
1343 if (!hwif->irq) {
1344 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1345 {
1346 printk("%s: DISABLED, NO IRQ\n", hwif->name);
1347 return (hwif->present = 0);
1348 }
1349 }
1350#ifdef CONFIG_BLK_DEV_HD
1351 if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1352 printk("%s: CANNOT SHARE IRQ WITH OLD "
1353 "HARDDISK DRIVER (hd.c)\n", hwif->name);
1354 return (hwif->present = 0);
1355 }
1356#endif /* CONFIG_BLK_DEV_HD */
1357
1358 /* we set it back to 1 if all is ok below */
1359 hwif->present = 0;
1360
1361 if (register_blkdev(hwif->major, hwif->name))
1362 return 0;
1363
1364 if (!hwif->sg_max_nents)
1365 hwif->sg_max_nents = PRD_ENTRIES;
1366
1367 hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1368 GFP_KERNEL);
1369 if (!hwif->sg_table) {
1370 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1371 goto out;
1372 }
1373
1374 if (init_irq(hwif) == 0)
1375 goto done;
1376
1377 old_irq = hwif->irq;
1378 /*
1379 * It failed to initialise. Find the default IRQ for
1380 * this port and try that.
1381 */
1382 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1383 printk("%s: Disabled unable to get IRQ %d.\n",
1384 hwif->name, old_irq);
1385 goto out;
1386 }
1387 if (init_irq(hwif)) {
1388 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1389 hwif->name, old_irq, hwif->irq);
1390 goto out;
1391 }
1392 printk("%s: probed IRQ %d failed, using default.\n",
1393 hwif->name, hwif->irq);
1394
1395done:
1396 init_gendisk(hwif);
1397 hwif->present = 1; /* success */
1398 return 1;
1399
1400out:
1401 unregister_blkdev(hwif->major, hwif->name);
1402 return 0;
1403}
1404
1405int ideprobe_init (void)
1406{
1407 unsigned int index;
1408 int probe[MAX_HWIFS];
1409
1410 memset(probe, 0, MAX_HWIFS * sizeof(int));
1411 for (index = 0; index < MAX_HWIFS; ++index)
1412 probe[index] = !ide_hwifs[index].present;
1413
1414 for (index = 0; index < MAX_HWIFS; ++index)
1415 if (probe[index])
1416 probe_hwif(&ide_hwifs[index]);
1417 for (index = 0; index < MAX_HWIFS; ++index)
1418 if (probe[index])
1419 hwif_init(&ide_hwifs[index]);
1420 for (index = 0; index < MAX_HWIFS; ++index) {
1421 if (probe[index]) {
1422 ide_hwif_t *hwif = &ide_hwifs[index];
1423 int unit;
1424 if (!hwif->present)
1425 continue;
1426 if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1427 hwif->chipset = ide_generic;
1428 for (unit = 0; unit < MAX_DRIVES; ++unit)
1429 if (hwif->drives[unit].present)
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001430 device_register(&hwif->drives[unit].gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431 }
1432 }
1433 return 0;
1434}
1435
1436EXPORT_SYMBOL_GPL(ideprobe_init);