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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
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/**
128 * drive_is_flashcard - check for compact flash
129 * @drive: drive to check
130 *
131 * CompactFlash cards and their brethern pretend to be removable
132 * hard disks, except:
133 * (1) they never have a slave unit, and
134 * (2) they don't have doorlock mechanisms.
135 * This test catches them, and is invoked elsewhere when setting
136 * appropriate config bits.
137 *
138 * FIXME: This treatment is probably applicable for *all* PCMCIA (PC CARD)
139 * devices, so in linux 2.3.x we should change this to just treat all
140 * PCMCIA drives this way, and get rid of the model-name tests below
141 * (too big of an interface change for 2.4.x).
142 * At that time, we might also consider parameterizing the timeouts and
143 * retries, since these are MUCH faster than mechanical drives. -M.Lord
144 */
145
146static inline int drive_is_flashcard (ide_drive_t *drive)
147{
148 struct hd_driveid *id = drive->id;
149
150 if (drive->removable) {
151 if (id->config == 0x848a) return 1; /* CompactFlash */
152 if (!strncmp(id->model, "KODAK ATA_FLASH", 15) /* Kodak */
153 || !strncmp(id->model, "Hitachi CV", 10) /* Hitachi */
154 || !strncmp(id->model, "SunDisk SDCFB", 13) /* old SanDisk */
155 || !strncmp(id->model, "SanDisk SDCFB", 13) /* SanDisk */
156 || !strncmp(id->model, "HAGIWARA HPC", 12) /* Hagiwara */
157 || !strncmp(id->model, "LEXAR ATA_FLASH", 15) /* Lexar */
158 || !strncmp(id->model, "ATA_FLASH", 9)) /* Simple Tech */
159 {
160 return 1; /* yes, it is a flash memory card */
161 }
162 }
163 return 0; /* no, it is not a flash memory card */
164}
165
166/**
167 * do_identify - identify a drive
168 * @drive: drive to identify
169 * @cmd: command used
170 *
171 * Called when we have issued a drive identify command to
172 * read and parse the results. This function is run with
173 * interrupts disabled.
174 */
175
176static inline void do_identify (ide_drive_t *drive, u8 cmd)
177{
178 ide_hwif_t *hwif = HWIF(drive);
179 int bswap = 1;
180 struct hd_driveid *id;
181
182 id = drive->id;
183 /* read 512 bytes of id info */
184 hwif->ata_input_data(drive, id, SECTOR_WORDS);
185
186 drive->id_read = 1;
187 local_irq_enable();
188 ide_fix_driveid(id);
189
190#if defined (CONFIG_SCSI_EATA_DMA) || defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
191 /*
192 * EATA SCSI controllers do a hardware ATA emulation:
193 * Ignore them if there is a driver for them available.
194 */
195 if ((id->model[0] == 'P' && id->model[1] == 'M') ||
196 (id->model[0] == 'S' && id->model[1] == 'K')) {
197 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
198 goto err_misc;
199 }
200#endif /* CONFIG_SCSI_EATA_DMA || CONFIG_SCSI_EATA_PIO */
201
202 /*
203 * WIN_IDENTIFY returns little-endian info,
204 * WIN_PIDENTIFY *usually* returns little-endian info.
205 */
206 if (cmd == WIN_PIDENTIFY) {
207 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
208 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
209 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
210 /* Vertos drives may still be weird */
211 bswap ^= 1;
212 }
213 ide_fixstring(id->model, sizeof(id->model), bswap);
214 ide_fixstring(id->fw_rev, sizeof(id->fw_rev), bswap);
215 ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
216
217 if (strstr(id->model, "E X A B Y T E N E S T"))
218 goto err_misc;
219
220 /* we depend on this a lot! */
221 id->model[sizeof(id->model)-1] = '\0';
222 printk("%s: %s, ", drive->name, id->model);
223 drive->present = 1;
224 drive->dead = 0;
225
226 /*
227 * Check for an ATAPI device
228 */
229 if (cmd == WIN_PIDENTIFY) {
230 u8 type = (id->config >> 8) & 0x1f;
231 printk("ATAPI ");
232 switch (type) {
233 case ide_floppy:
234 if (!strstr(id->model, "CD-ROM")) {
235 if (!strstr(id->model, "oppy") &&
236 !strstr(id->model, "poyp") &&
237 !strstr(id->model, "ZIP"))
238 printk("cdrom or floppy?, assuming ");
239 if (drive->media != ide_cdrom) {
240 printk ("FLOPPY");
241 drive->removable = 1;
242 break;
243 }
244 }
245 /* Early cdrom models used zero */
246 type = ide_cdrom;
247 case ide_cdrom:
248 drive->removable = 1;
249#ifdef CONFIG_PPC
250 /* kludge for Apple PowerBook internal zip */
251 if (!strstr(id->model, "CD-ROM") &&
252 strstr(id->model, "ZIP")) {
253 printk ("FLOPPY");
254 type = ide_floppy;
255 break;
256 }
257#endif
258 printk ("CD/DVD-ROM");
259 break;
260 case ide_tape:
261 printk ("TAPE");
262 break;
263 case ide_optical:
264 printk ("OPTICAL");
265 drive->removable = 1;
266 break;
267 default:
268 printk("UNKNOWN (type %d)", type);
269 break;
270 }
271 printk (" drive\n");
272 drive->media = type;
273 /* an ATAPI device ignores DRDY */
274 drive->ready_stat = 0;
275 return;
276 }
277
278 /*
279 * Not an ATAPI device: looks like a "regular" hard disk
280 */
281 if (id->config & (1<<7))
282 drive->removable = 1;
283
284 if (drive_is_flashcard(drive))
285 drive->is_flash = 1;
286 drive->media = ide_disk;
287 printk("%s DISK drive\n", (drive->is_flash) ? "CFA" : "ATA" );
288 QUIRK_LIST(drive);
289 return;
290
291err_misc:
292 kfree(id);
293 drive->present = 0;
294 return;
295}
296
297/**
298 * actual_try_to_identify - send ata/atapi identify
299 * @drive: drive to identify
300 * @cmd: command to use
301 *
302 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
303 * and waits for a response. It also monitors irqs while this is
304 * happening, in hope of automatically determining which one is
305 * being used by the interface.
306 *
307 * Returns: 0 device was identified
308 * 1 device timed-out (no response to identify request)
309 * 2 device aborted the command (refused to identify itself)
310 */
311
312static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
313{
314 ide_hwif_t *hwif = HWIF(drive);
315 int rc;
316 unsigned long hd_status;
317 unsigned long timeout;
318 u8 s = 0, a = 0;
319
320 /* take a deep breath */
321 msleep(50);
322
323 if (IDE_CONTROL_REG) {
324 a = hwif->INB(IDE_ALTSTATUS_REG);
325 s = hwif->INB(IDE_STATUS_REG);
326 if ((a ^ s) & ~INDEX_STAT) {
327 printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
328 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
329 /* ancient Seagate drives, broken interfaces */
330 hd_status = IDE_STATUS_REG;
331 } else {
332 /* use non-intrusive polling */
333 hd_status = IDE_ALTSTATUS_REG;
334 }
335 } else
336 hd_status = IDE_STATUS_REG;
337
338 /* set features register for atapi
339 * identify command to be sure of reply
340 */
341 if ((cmd == WIN_PIDENTIFY))
342 /* disable dma & overlap */
343 hwif->OUTB(0, IDE_FEATURE_REG);
344
345 /* ask drive for ID */
346 hwif->OUTB(cmd, IDE_COMMAND_REG);
347
348 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
349 timeout += jiffies;
350 do {
351 if (time_after(jiffies, timeout)) {
352 /* drive timed-out */
353 return 1;
354 }
355 /* give drive a breather */
356 msleep(50);
357 } while ((hwif->INB(hd_status)) & BUSY_STAT);
358
359 /* wait for IRQ and DRQ_STAT */
360 msleep(50);
361 if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
362 unsigned long flags;
363
364 /* local CPU only; some systems need this */
365 local_irq_save(flags);
366 /* drive returned ID */
367 do_identify(drive, cmd);
368 /* drive responded with ID */
369 rc = 0;
370 /* clear drive IRQ */
371 (void) hwif->INB(IDE_STATUS_REG);
372 local_irq_restore(flags);
373 } else {
374 /* drive refused ID */
375 rc = 2;
376 }
377 return rc;
378}
379
380/**
381 * try_to_identify - try to identify a drive
382 * @drive: drive to probe
383 * @cmd: command to use
384 *
385 * Issue the identify command and then do IRQ probing to
386 * complete the identification when needed by finding the
387 * IRQ the drive is attached to
388 */
389
390static int try_to_identify (ide_drive_t *drive, u8 cmd)
391{
392 ide_hwif_t *hwif = HWIF(drive);
393 int retval;
394 int autoprobe = 0;
395 unsigned long cookie = 0;
396
397 /*
398 * Disable device irq unless we need to
399 * probe for it. Otherwise we'll get spurious
400 * interrupts during the identify-phase that
401 * the irq handler isn't expecting.
402 */
403 if (IDE_CONTROL_REG) {
404 u8 ctl = drive->ctl | 2;
405 if (!hwif->irq) {
406 autoprobe = 1;
407 cookie = probe_irq_on();
408 /* enable device irq */
409 ctl &= ~2;
410 }
411 hwif->OUTB(ctl, IDE_CONTROL_REG);
412 }
413
414 retval = actual_try_to_identify(drive, cmd);
415
416 if (autoprobe) {
417 int irq;
418 /* mask device irq */
419 hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
420 /* clear drive IRQ */
421 (void) hwif->INB(IDE_STATUS_REG);
422 udelay(5);
423 irq = probe_irq_off(cookie);
424 if (!hwif->irq) {
425 if (irq > 0) {
426 hwif->irq = irq;
427 } else {
428 /* Mmmm.. multiple IRQs..
429 * don't know which was ours
430 */
431 printk("%s: IRQ probe failed (0x%lx)\n",
432 drive->name, cookie);
433 }
434 }
435 }
436 return retval;
437}
438
439
440/**
441 * do_probe - probe an IDE device
442 * @drive: drive to probe
443 * @cmd: command to use
444 *
445 * do_probe() has the difficult job of finding a drive if it exists,
446 * without getting hung up if it doesn't exist, without trampling on
447 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
448 *
449 * If a drive is "known" to exist (from CMOS or kernel parameters),
450 * but does not respond right away, the probe will "hang in there"
451 * for the maximum wait time (about 30 seconds), otherwise it will
452 * exit much more quickly.
453 *
454 * Returns: 0 device was identified
455 * 1 device timed-out (no response to identify request)
456 * 2 device aborted the command (refused to identify itself)
457 * 3 bad status from device (possible for ATAPI drives)
458 * 4 probe was not attempted because failure was obvious
459 */
460
461static int do_probe (ide_drive_t *drive, u8 cmd)
462{
463 int rc;
464 ide_hwif_t *hwif = HWIF(drive);
465
466 if (drive->present) {
467 /* avoid waiting for inappropriate probes */
468 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
469 return 4;
470 }
471#ifdef DEBUG
472 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
473 drive->name, drive->present, drive->media,
474 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
475#endif
476
477 /* needed for some systems
478 * (e.g. crw9624 as drive0 with disk as slave)
479 */
480 msleep(50);
481 SELECT_DRIVE(drive);
482 msleep(50);
483 if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
484 if (drive->select.b.unit != 0) {
485 /* exit with drive0 selected */
486 SELECT_DRIVE(&hwif->drives[0]);
487 /* allow BUSY_STAT to assert & clear */
488 msleep(50);
489 }
490 /* no i/f present: mmm.. this should be a 4 -ml */
491 return 3;
492 }
493
494 if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
495 drive->present || cmd == WIN_PIDENTIFY) {
496 /* send cmd and wait */
497 if ((rc = try_to_identify(drive, cmd))) {
498 /* failed: try again */
499 rc = try_to_identify(drive,cmd);
500 }
501 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
502 return 4;
503
504 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
505 ((drive->autotune == IDE_TUNE_DEFAULT) ||
506 (drive->autotune == IDE_TUNE_AUTO))) {
507 unsigned long timeout;
508 printk("%s: no response (status = 0x%02x), "
509 "resetting drive\n", drive->name,
510 hwif->INB(IDE_STATUS_REG));
511 msleep(50);
512 hwif->OUTB(drive->select.all, IDE_SELECT_REG);
513 msleep(50);
514 hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
515 timeout = jiffies;
516 while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
517 time_before(jiffies, timeout + WAIT_WORSTCASE))
518 msleep(50);
519 rc = try_to_identify(drive, cmd);
520 }
521 if (rc == 1)
522 printk("%s: no response (status = 0x%02x)\n",
523 drive->name, hwif->INB(IDE_STATUS_REG));
524 /* ensure drive irq is clear */
525 (void) hwif->INB(IDE_STATUS_REG);
526 } else {
527 /* not present or maybe ATAPI */
528 rc = 3;
529 }
530 if (drive->select.b.unit != 0) {
531 /* exit with drive0 selected */
532 SELECT_DRIVE(&hwif->drives[0]);
533 msleep(50);
534 /* ensure drive irq is clear */
535 (void) hwif->INB(IDE_STATUS_REG);
536 }
537 return rc;
538}
539
540/*
541 *
542 */
543static void enable_nest (ide_drive_t *drive)
544{
545 ide_hwif_t *hwif = HWIF(drive);
546 unsigned long timeout;
547
548 printk("%s: enabling %s -- ", hwif->name, drive->id->model);
549 SELECT_DRIVE(drive);
550 msleep(50);
551 hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
552 timeout = jiffies + WAIT_WORSTCASE;
553 do {
554 if (time_after(jiffies, timeout)) {
555 printk("failed (timeout)\n");
556 return;
557 }
558 msleep(50);
559 } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
560
561 msleep(50);
562
563 if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
564 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
565 } else {
566 printk("success\n");
567 }
568
569 /* if !(success||timed-out) */
570 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
571 /* look for ATAPI device */
572 (void) do_probe(drive, WIN_PIDENTIFY);
573 }
574}
575
576/**
577 * probe_for_drives - upper level drive probe
578 * @drive: drive to probe for
579 *
580 * probe_for_drive() tests for existence of a given drive using do_probe()
581 * and presents things to the user as needed.
582 *
583 * Returns: 0 no device was found
584 * 1 device was found (note: drive->present might
585 * still be 0)
586 */
587
588static inline u8 probe_for_drive (ide_drive_t *drive)
589{
590 /*
591 * In order to keep things simple we have an id
592 * block for all drives at all times. If the device
593 * is pre ATA or refuses ATA/ATAPI identify we
594 * will add faked data to this.
595 *
596 * Also note that 0 everywhere means "can't do X"
597 */
598
599 drive->id = kmalloc(SECTOR_WORDS *4, GFP_KERNEL);
600 drive->id_read = 0;
601 if(drive->id == NULL)
602 {
603 printk(KERN_ERR "ide: out of memory for id data.\n");
604 return 0;
605 }
606 memset(drive->id, 0, SECTOR_WORDS * 4);
607 strcpy(drive->id->model, "UNKNOWN");
608
609 /* skip probing? */
610 if (!drive->noprobe)
611 {
612 /* if !(success||timed-out) */
613 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
614 /* look for ATAPI device */
615 (void) do_probe(drive, WIN_PIDENTIFY);
616 }
617 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
618 enable_nest(drive);
619 if (!drive->present)
620 /* drive not found */
621 return 0;
622
623 /* identification failed? */
624 if (!drive->id_read) {
625 if (drive->media == ide_disk) {
626 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
627 drive->name, drive->cyl,
628 drive->head, drive->sect);
629 } else if (drive->media == ide_cdrom) {
630 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
631 } else {
632 /* nuke it */
633 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
634 drive->present = 0;
635 }
636 }
637 /* drive was found */
638 }
639 if(!drive->present)
640 return 0;
641 /* The drive wasn't being helpful. Add generic info only */
642 if (drive->id_read == 0) {
643 generic_id(drive);
644 return 1;
645 }
646
647 if (drive->media == ide_disk) {
648 ide_disk_init_chs(drive);
649 ide_disk_init_mult_count(drive);
650 }
651
652 return drive->present;
653}
654
655static void hwif_release_dev (struct device *dev)
656{
657 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
658
659 up(&hwif->gendev_rel_sem);
660}
661
662static void hwif_register (ide_hwif_t *hwif)
663{
664 /* register with global device tree */
665 strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
666 hwif->gendev.driver_data = hwif;
667 if (hwif->gendev.parent == NULL) {
668 if (hwif->pci_dev)
669 hwif->gendev.parent = &hwif->pci_dev->dev;
670 else
671 /* Would like to do = &device_legacy */
672 hwif->gendev.parent = NULL;
673 }
674 hwif->gendev.release = hwif_release_dev;
675 device_register(&hwif->gendev);
676}
677
678static int wait_hwif_ready(ide_hwif_t *hwif)
679{
680 int rc;
681
682 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
683
684 /* Let HW settle down a bit from whatever init state we
685 * come from */
686 mdelay(2);
687
688 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
689 * I know of at least one disk who takes 31 seconds, I use 35
690 * here to be safe
691 */
692 rc = ide_wait_not_busy(hwif, 35000);
693 if (rc)
694 return rc;
695
696 /* Now make sure both master & slave are ready */
697 SELECT_DRIVE(&hwif->drives[0]);
698 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
699 mdelay(2);
Marcello Maggioni284e4232005-05-26 15:47:35 +0200700 rc = ide_wait_not_busy(hwif, 35000);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 if (rc)
702 return rc;
703 SELECT_DRIVE(&hwif->drives[1]);
704 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
705 mdelay(2);
Marcello Maggioni284e4232005-05-26 15:47:35 +0200706 rc = ide_wait_not_busy(hwif, 35000);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707
708 /* Exit function with master reselected (let's be sane) */
709 SELECT_DRIVE(&hwif->drives[0]);
710
711 return rc;
712}
713
714/**
715 * ide_undecoded_slave - look for bad CF adapters
716 * @hwif: interface
717 *
718 * Analyse the drives on the interface and attempt to decide if we
719 * have the same drive viewed twice. This occurs with crap CF adapters
720 * and PCMCIA sometimes.
721 */
722
723void ide_undecoded_slave(ide_hwif_t *hwif)
724{
725 ide_drive_t *drive0 = &hwif->drives[0];
726 ide_drive_t *drive1 = &hwif->drives[1];
727
728 if (drive0->present == 0 || drive1->present == 0)
729 return;
730
731 /* If the models don't match they are not the same product */
732 if (strcmp(drive0->id->model, drive1->id->model))
733 return;
734
735 /* Serial numbers do not match */
736 if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
737 return;
738
739 /* No serial number, thankfully very rare for CF */
740 if (drive0->id->serial_no[0] == 0)
741 return;
742
743 /* Appears to be an IDE flash adapter with decode bugs */
744 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
745
746 drive1->present = 0;
747}
748
749EXPORT_SYMBOL_GPL(ide_undecoded_slave);
750
751/*
752 * This routine only knows how to look for drive units 0 and 1
753 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
754 */
755static void probe_hwif(ide_hwif_t *hwif)
756{
757 unsigned int unit;
758 unsigned long flags;
759 unsigned int irqd;
760
761 if (hwif->noprobe)
762 return;
763
764 if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
765 (ide_hwif_request_regions(hwif))) {
766 u16 msgout = 0;
767 for (unit = 0; unit < MAX_DRIVES; ++unit) {
768 ide_drive_t *drive = &hwif->drives[unit];
769 if (drive->present) {
770 drive->present = 0;
771 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
772 drive->name);
773 msgout = 1;
774 }
775 }
776 if (!msgout)
777 printk(KERN_ERR "%s: ports already in use, skipping probe\n",
778 hwif->name);
779 return;
780 }
781
782 /*
783 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
784 * we'll install our IRQ driver much later...
785 */
786 irqd = hwif->irq;
787 if (irqd)
788 disable_irq(hwif->irq);
789
790 local_irq_set(flags);
791
792 /* This is needed on some PPCs and a bunch of BIOS-less embedded
793 * platforms. Typical cases are:
794 *
795 * - The firmware hard reset the disk before booting the kernel,
796 * the drive is still doing it's poweron-reset sequence, that
797 * can take up to 30 seconds
798 * - The firmware does nothing (or no firmware), the device is
799 * still in POST state (same as above actually).
800 * - Some CD/DVD/Writer combo drives tend to drive the bus during
801 * their reset sequence even when they are non-selected slave
802 * devices, thus preventing discovery of the main HD
803 *
804 * Doing this wait-for-busy should not harm any existing configuration
805 * (at least things won't be worse than what current code does, that
806 * is blindly go & talk to the drive) and fix some issues like the
807 * above.
808 *
809 * BenH.
810 */
811 if (wait_hwif_ready(hwif) == -EBUSY)
812 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
813
814 /*
815 * Second drive should only exist if first drive was found,
816 * but a lot of cdrom drives are configured as single slaves.
817 */
818 for (unit = 0; unit < MAX_DRIVES; ++unit) {
819 ide_drive_t *drive = &hwif->drives[unit];
820 drive->dn = (hwif->channel ? 2 : 0) + unit;
821 (void) probe_for_drive(drive);
822 if (drive->present && !hwif->present) {
823 hwif->present = 1;
824 if (hwif->chipset != ide_4drives ||
825 !hwif->mate ||
826 !hwif->mate->present) {
827 hwif_register(hwif);
828 }
829 }
830 }
831 if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
832 unsigned long timeout = jiffies + WAIT_WORSTCASE;
833 u8 stat;
834
835 printk(KERN_WARNING "%s: reset\n", hwif->name);
836 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
837 udelay(10);
838 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
839 do {
840 msleep(50);
841 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
842 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
843
844 }
845 local_irq_restore(flags);
846 /*
847 * Use cached IRQ number. It might be (and is...) changed by probe
848 * code above
849 */
850 if (irqd)
851 enable_irq(irqd);
852
853 if (!hwif->present) {
854 ide_hwif_release_regions(hwif);
855 return;
856 }
857
858 for (unit = 0; unit < MAX_DRIVES; ++unit) {
859 ide_drive_t *drive = &hwif->drives[unit];
860
861 if (drive->present) {
862 if (hwif->tuneproc != NULL &&
863 drive->autotune == IDE_TUNE_AUTO)
864 /* auto-tune PIO mode */
865 hwif->tuneproc(drive, 255);
866
867 if (drive->autotune != IDE_TUNE_DEFAULT &&
868 drive->autotune != IDE_TUNE_AUTO)
869 continue;
870
871 drive->nice1 = 1;
872
873 /*
874 * MAJOR HACK BARF :-/
875 *
876 * FIXME: chipsets own this cruft!
877 */
878 /*
879 * Move here to prevent module loading clashing.
880 */
881 // drive->autodma = hwif->autodma;
882 if (hwif->ide_dma_check) {
883 /*
884 * Force DMAing for the beginning of the check.
885 * Some chipsets appear to do interesting
886 * things, if not checked and cleared.
887 * PARANOIA!!!
888 */
889 hwif->ide_dma_off_quietly(drive);
890#ifdef CONFIG_IDEDMA_ONLYDISK
891 if (drive->media == ide_disk)
892#endif
893 hwif->ide_dma_check(drive);
894 }
895 }
896 }
897}
898
899static int hwif_init(ide_hwif_t *hwif);
900
901int probe_hwif_init_with_fixup(ide_hwif_t *hwif, void (*fixup)(ide_hwif_t *hwif))
902{
903 probe_hwif(hwif);
904
905 if (fixup)
906 fixup(hwif);
907
908 if (!hwif_init(hwif)) {
909 printk(KERN_INFO "%s: failed to initialize IDE interface\n",
910 hwif->name);
911 return -1;
912 }
913
914 if (hwif->present) {
915 u16 unit = 0;
916 for (unit = 0; unit < MAX_DRIVES; ++unit) {
917 ide_drive_t *drive = &hwif->drives[unit];
918 /* For now don't attach absent drives, we may
919 want them on default or a new "empty" class
920 for hotplug reprobing ? */
921 if (drive->present) {
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +0200922 device_register(&drive->gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 }
924 }
925 }
926 return 0;
927}
928
929int probe_hwif_init(ide_hwif_t *hwif)
930{
931 return probe_hwif_init_with_fixup(hwif, NULL);
932}
933
934EXPORT_SYMBOL(probe_hwif_init);
935
936#if MAX_HWIFS > 1
937/*
938 * save_match() is used to simplify logic in init_irq() below.
939 *
940 * A loophole here is that we may not know about a particular
941 * hwif's irq until after that hwif is actually probed/initialized..
942 * This could be a problem for the case where an hwif is on a
943 * dual interface that requires serialization (eg. cmd640) and another
944 * hwif using one of the same irqs is initialized beforehand.
945 *
946 * This routine detects and reports such situations, but does not fix them.
947 */
948static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
949{
950 ide_hwif_t *m = *match;
951
952 if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
953 if (!new->hwgroup)
954 return;
955 printk("%s: potential irq problem with %s and %s\n",
956 hwif->name, new->name, m->name);
957 }
958 if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
959 *match = new;
960}
961#endif /* MAX_HWIFS > 1 */
962
963/*
964 * init request queue
965 */
966static int ide_init_queue(ide_drive_t *drive)
967{
968 request_queue_t *q;
969 ide_hwif_t *hwif = HWIF(drive);
970 int max_sectors = 256;
971 int max_sg_entries = PRD_ENTRIES;
972
973 /*
974 * Our default set up assumes the normal IDE case,
975 * that is 64K segmenting, standard PRD setup
976 * and LBA28. Some drivers then impose their own
977 * limits and LBA48 we could raise it but as yet
978 * do not.
979 */
Christoph Lameter19460892005-06-23 00:08:19 -0700980
981 q = blk_init_queue_node(do_ide_request, &ide_lock,
982 pcibus_to_node(drive->hwif->pci_dev->bus));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 if (!q)
984 return 1;
985
986 q->queuedata = drive;
987 blk_queue_segment_boundary(q, 0xffff);
988
989 if (!hwif->rqsize) {
990 if (hwif->no_lba48 || hwif->no_lba48_dma)
991 hwif->rqsize = 256;
992 else
993 hwif->rqsize = 65536;
994 }
995 if (hwif->rqsize < max_sectors)
996 max_sectors = hwif->rqsize;
997 blk_queue_max_sectors(q, max_sectors);
998
999#ifdef CONFIG_PCI
1000 /* When we have an IOMMU, we may have a problem where pci_map_sg()
1001 * creates segments that don't completely match our boundary
1002 * requirements and thus need to be broken up again. Because it
1003 * doesn't align properly either, we may actually have to break up
1004 * to more segments than what was we got in the first place, a max
1005 * worst case is twice as many.
1006 * This will be fixed once we teach pci_map_sg() about our boundary
1007 * requirements, hopefully soon. *FIXME*
1008 */
1009 if (!PCI_DMA_BUS_IS_PHYS)
1010 max_sg_entries >>= 1;
1011#endif /* CONFIG_PCI */
1012
1013 blk_queue_max_hw_segments(q, max_sg_entries);
1014 blk_queue_max_phys_segments(q, max_sg_entries);
1015
1016 /* assign drive queue */
1017 drive->queue = q;
1018
1019 /* needs drive->queue to be set */
1020 ide_toggle_bounce(drive, 1);
1021
1022 /* enable led activity for disk drives only */
1023 if (drive->media == ide_disk && hwif->led_act)
1024 blk_queue_activity_fn(q, hwif->led_act, drive);
1025
1026 return 0;
1027}
1028
1029/*
1030 * This routine sets up the irq for an ide interface, and creates a new
1031 * hwgroup for the irq/hwif if none was previously assigned.
1032 *
1033 * Much of the code is for correctly detecting/handling irq sharing
1034 * and irq serialization situations. This is somewhat complex because
1035 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1036 *
1037 * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
1038 * interrupts completely disabled. This can be bad for interrupt latency,
1039 * but anything else has led to problems on some machines. We re-enable
1040 * interrupts as much as we can safely do in most places.
1041 */
1042static int init_irq (ide_hwif_t *hwif)
1043{
1044 unsigned int index;
1045 ide_hwgroup_t *hwgroup;
1046 ide_hwif_t *match = NULL;
1047
1048
1049 BUG_ON(in_interrupt());
1050 BUG_ON(irqs_disabled());
1051 down(&ide_cfg_sem);
1052 hwif->hwgroup = NULL;
1053#if MAX_HWIFS > 1
1054 /*
1055 * Group up with any other hwifs that share our irq(s).
1056 */
1057 for (index = 0; index < MAX_HWIFS; index++) {
1058 ide_hwif_t *h = &ide_hwifs[index];
1059 if (h->hwgroup) { /* scan only initialized hwif's */
1060 if (hwif->irq == h->irq) {
1061 hwif->sharing_irq = h->sharing_irq = 1;
1062 if (hwif->chipset != ide_pci ||
1063 h->chipset != ide_pci) {
1064 save_match(hwif, h, &match);
1065 }
1066 }
1067 if (hwif->serialized) {
1068 if (hwif->mate && hwif->mate->irq == h->irq)
1069 save_match(hwif, h, &match);
1070 }
1071 if (h->serialized) {
1072 if (h->mate && hwif->irq == h->mate->irq)
1073 save_match(hwif, h, &match);
1074 }
1075 }
1076 }
1077#endif /* MAX_HWIFS > 1 */
1078 /*
1079 * If we are still without a hwgroup, then form a new one
1080 */
1081 if (match) {
1082 hwgroup = match->hwgroup;
1083 hwif->hwgroup = hwgroup;
1084 /*
1085 * Link us into the hwgroup.
1086 * This must be done early, do ensure that unexpected_intr
1087 * can find the hwif and prevent irq storms.
1088 * No drives are attached to the new hwif, choose_drive
1089 * can't do anything stupid (yet).
1090 * Add ourself as the 2nd entry to the hwgroup->hwif
1091 * linked list, the first entry is the hwif that owns
1092 * hwgroup->handler - do not change that.
1093 */
1094 spin_lock_irq(&ide_lock);
1095 hwif->next = hwgroup->hwif->next;
1096 hwgroup->hwif->next = hwif;
1097 spin_unlock_irq(&ide_lock);
1098 } else {
Christoph Lameter19460892005-06-23 00:08:19 -07001099 hwgroup = kmalloc_node(sizeof(ide_hwgroup_t), GFP_KERNEL,
1100 pcibus_to_node(hwif->drives[0].hwif->pci_dev->bus));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 if (!hwgroup)
1102 goto out_up;
1103
1104 hwif->hwgroup = hwgroup;
1105
1106 memset(hwgroup, 0, sizeof(ide_hwgroup_t));
1107 hwgroup->hwif = hwif->next = hwif;
1108 hwgroup->rq = NULL;
1109 hwgroup->handler = NULL;
1110 hwgroup->drive = NULL;
1111 hwgroup->busy = 0;
1112 init_timer(&hwgroup->timer);
1113 hwgroup->timer.function = &ide_timer_expiry;
1114 hwgroup->timer.data = (unsigned long) hwgroup;
1115 }
1116
1117 /*
1118 * Allocate the irq, if not already obtained for another hwif
1119 */
1120 if (!match || match->irq != hwif->irq) {
1121 int sa = SA_INTERRUPT;
1122#if defined(__mc68000__) || defined(CONFIG_APUS)
1123 sa = SA_SHIRQ;
1124#endif /* __mc68000__ || CONFIG_APUS */
1125
1126 if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
1127 sa = SA_SHIRQ;
1128#ifndef CONFIG_IDEPCI_SHARE_IRQ
1129 sa |= SA_INTERRUPT;
1130#endif /* CONFIG_IDEPCI_SHARE_IRQ */
1131 }
1132
1133 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1134 /* clear nIEN */
1135 hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1136
1137 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1138 goto out_unlink;
1139 }
1140
1141 /*
1142 * For any present drive:
1143 * - allocate the block device queue
1144 * - link drive into the hwgroup
1145 */
1146 for (index = 0; index < MAX_DRIVES; ++index) {
1147 ide_drive_t *drive = &hwif->drives[index];
1148 if (!drive->present)
1149 continue;
1150 if (ide_init_queue(drive)) {
1151 printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1152 continue;
1153 }
1154 spin_lock_irq(&ide_lock);
1155 if (!hwgroup->drive) {
1156 /* first drive for hwgroup. */
1157 drive->next = drive;
1158 hwgroup->drive = drive;
1159 hwgroup->hwif = HWIF(hwgroup->drive);
1160 } else {
1161 drive->next = hwgroup->drive->next;
1162 hwgroup->drive->next = drive;
1163 }
1164 spin_unlock_irq(&ide_lock);
1165 }
1166
1167#if !defined(__mc68000__) && !defined(CONFIG_APUS) && !defined(__sparc__)
1168 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1169 hwif->io_ports[IDE_DATA_OFFSET],
1170 hwif->io_ports[IDE_DATA_OFFSET]+7,
1171 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1172#elif defined(__sparc__)
1173 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %s", hwif->name,
1174 hwif->io_ports[IDE_DATA_OFFSET],
1175 hwif->io_ports[IDE_DATA_OFFSET]+7,
1176 hwif->io_ports[IDE_CONTROL_OFFSET], __irq_itoa(hwif->irq));
1177#else
1178 printk("%s at 0x%08lx on irq %d", hwif->name,
1179 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1180#endif /* __mc68000__ && CONFIG_APUS */
1181 if (match)
1182 printk(" (%sed with %s)",
1183 hwif->sharing_irq ? "shar" : "serializ", match->name);
1184 printk("\n");
1185 up(&ide_cfg_sem);
1186 return 0;
1187out_unlink:
1188 spin_lock_irq(&ide_lock);
1189 if (hwif->next == hwif) {
1190 BUG_ON(match);
1191 BUG_ON(hwgroup->hwif != hwif);
1192 kfree(hwgroup);
1193 } else {
1194 ide_hwif_t *g;
1195 g = hwgroup->hwif;
1196 while (g->next != hwif)
1197 g = g->next;
1198 g->next = hwif->next;
1199 if (hwgroup->hwif == hwif) {
1200 /* Impossible. */
1201 printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1202 hwgroup->hwif = g;
1203 }
1204 BUG_ON(hwgroup->hwif == hwif);
1205 }
1206 spin_unlock_irq(&ide_lock);
1207out_up:
1208 up(&ide_cfg_sem);
1209 return 1;
1210}
1211
1212static int ata_lock(dev_t dev, void *data)
1213{
1214 /* FIXME: we want to pin hwif down */
1215 return 0;
1216}
1217
1218static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1219{
1220 ide_hwif_t *hwif = data;
1221 int unit = *part >> PARTN_BITS;
1222 ide_drive_t *drive = &hwif->drives[unit];
1223 if (!drive->present)
1224 return NULL;
1225
1226 if (drive->media == ide_disk)
1227 request_module("ide-disk");
1228 if (drive->scsi)
1229 request_module("ide-scsi");
1230 if (drive->media == ide_cdrom || drive->media == ide_optical)
1231 request_module("ide-cd");
1232 if (drive->media == ide_tape)
1233 request_module("ide-tape");
1234 if (drive->media == ide_floppy)
1235 request_module("ide-floppy");
1236
1237 return NULL;
1238}
1239
1240static struct kobject *exact_match(dev_t dev, int *part, void *data)
1241{
1242 struct gendisk *p = data;
1243 *part &= (1 << PARTN_BITS) - 1;
1244 return &p->kobj;
1245}
1246
1247static int exact_lock(dev_t dev, void *data)
1248{
1249 struct gendisk *p = data;
1250
1251 if (!get_disk(p))
1252 return -1;
1253 return 0;
1254}
1255
1256void ide_register_region(struct gendisk *disk)
1257{
1258 blk_register_region(MKDEV(disk->major, disk->first_minor),
1259 disk->minors, NULL, exact_match, exact_lock, disk);
1260}
1261
1262EXPORT_SYMBOL_GPL(ide_register_region);
1263
1264void ide_unregister_region(struct gendisk *disk)
1265{
1266 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1267 disk->minors);
1268}
1269
1270EXPORT_SYMBOL_GPL(ide_unregister_region);
1271
1272void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1273{
1274 ide_hwif_t *hwif = drive->hwif;
1275 unsigned int unit = (drive->select.all >> 4) & 1;
1276
1277 disk->major = hwif->major;
1278 disk->first_minor = unit << PARTN_BITS;
1279 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1280 disk->queue = drive->queue;
1281}
1282
1283EXPORT_SYMBOL_GPL(ide_init_disk);
1284
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001285static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1286{
1287 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1288
1289 if (drive == drive->next) {
1290 /* special case: last drive from hwgroup. */
1291 BUG_ON(hwgroup->drive != drive);
1292 hwgroup->drive = NULL;
1293 } else {
1294 ide_drive_t *walk;
1295
1296 walk = hwgroup->drive;
1297 while (walk->next != drive)
1298 walk = walk->next;
1299 walk->next = drive->next;
1300 if (hwgroup->drive == drive) {
1301 hwgroup->drive = drive->next;
1302 hwgroup->hwif = hwgroup->drive->hwif;
1303 }
1304 }
1305 BUG_ON(hwgroup->drive == drive);
1306}
1307
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308static void drive_release_dev (struct device *dev)
1309{
1310 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1311
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001312 spin_lock_irq(&ide_lock);
1313 if (drive->devfs_name[0] != '\0') {
1314 devfs_remove(drive->devfs_name);
1315 drive->devfs_name[0] = '\0';
1316 }
1317 ide_remove_drive_from_hwgroup(drive);
1318 if (drive->id != NULL) {
1319 kfree(drive->id);
1320 drive->id = NULL;
1321 }
1322 drive->present = 0;
1323 /* Messed up locking ... */
1324 spin_unlock_irq(&ide_lock);
1325 blk_cleanup_queue(drive->queue);
1326 spin_lock_irq(&ide_lock);
1327 drive->queue = NULL;
1328 spin_unlock_irq(&ide_lock);
1329
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 up(&drive->gendev_rel_sem);
1331}
1332
1333/*
1334 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1335 * after probing for drives, to allocate partition tables and other data
1336 * structures needed for the routines in genhd.c. ide_geninit() gets called
1337 * somewhat later, during the partition check.
1338 */
1339static void init_gendisk (ide_hwif_t *hwif)
1340{
1341 unsigned int unit;
1342
1343 for (unit = 0; unit < MAX_DRIVES; ++unit) {
1344 ide_drive_t * drive = &hwif->drives[unit];
1345 ide_add_generic_settings(drive);
1346 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1347 hwif->index,unit);
1348 drive->gendev.parent = &hwif->gendev;
1349 drive->gendev.bus = &ide_bus_type;
1350 drive->gendev.driver_data = drive;
1351 drive->gendev.release = drive_release_dev;
1352 if (drive->present) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353 sprintf(drive->devfs_name, "ide/host%d/bus%d/target%d/lun%d",
1354 (hwif->channel && hwif->mate) ?
1355 hwif->mate->index : hwif->index,
1356 hwif->channel, unit, drive->lun);
1357 }
1358 }
1359 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1360 THIS_MODULE, ata_probe, ata_lock, hwif);
1361}
1362
1363static int hwif_init(ide_hwif_t *hwif)
1364{
1365 int old_irq;
1366
1367 /* Return success if no device is connected */
1368 if (!hwif->present)
1369 return 1;
1370
1371 if (!hwif->irq) {
1372 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1373 {
1374 printk("%s: DISABLED, NO IRQ\n", hwif->name);
1375 return (hwif->present = 0);
1376 }
1377 }
1378#ifdef CONFIG_BLK_DEV_HD
1379 if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1380 printk("%s: CANNOT SHARE IRQ WITH OLD "
1381 "HARDDISK DRIVER (hd.c)\n", hwif->name);
1382 return (hwif->present = 0);
1383 }
1384#endif /* CONFIG_BLK_DEV_HD */
1385
1386 /* we set it back to 1 if all is ok below */
1387 hwif->present = 0;
1388
1389 if (register_blkdev(hwif->major, hwif->name))
1390 return 0;
1391
1392 if (!hwif->sg_max_nents)
1393 hwif->sg_max_nents = PRD_ENTRIES;
1394
1395 hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1396 GFP_KERNEL);
1397 if (!hwif->sg_table) {
1398 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1399 goto out;
1400 }
1401
1402 if (init_irq(hwif) == 0)
1403 goto done;
1404
1405 old_irq = hwif->irq;
1406 /*
1407 * It failed to initialise. Find the default IRQ for
1408 * this port and try that.
1409 */
1410 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1411 printk("%s: Disabled unable to get IRQ %d.\n",
1412 hwif->name, old_irq);
1413 goto out;
1414 }
1415 if (init_irq(hwif)) {
1416 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1417 hwif->name, old_irq, hwif->irq);
1418 goto out;
1419 }
1420 printk("%s: probed IRQ %d failed, using default.\n",
1421 hwif->name, hwif->irq);
1422
1423done:
1424 init_gendisk(hwif);
1425 hwif->present = 1; /* success */
1426 return 1;
1427
1428out:
1429 unregister_blkdev(hwif->major, hwif->name);
1430 return 0;
1431}
1432
1433int ideprobe_init (void)
1434{
1435 unsigned int index;
1436 int probe[MAX_HWIFS];
1437
1438 memset(probe, 0, MAX_HWIFS * sizeof(int));
1439 for (index = 0; index < MAX_HWIFS; ++index)
1440 probe[index] = !ide_hwifs[index].present;
1441
1442 for (index = 0; index < MAX_HWIFS; ++index)
1443 if (probe[index])
1444 probe_hwif(&ide_hwifs[index]);
1445 for (index = 0; index < MAX_HWIFS; ++index)
1446 if (probe[index])
1447 hwif_init(&ide_hwifs[index]);
1448 for (index = 0; index < MAX_HWIFS; ++index) {
1449 if (probe[index]) {
1450 ide_hwif_t *hwif = &ide_hwifs[index];
1451 int unit;
1452 if (!hwif->present)
1453 continue;
1454 if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1455 hwif->chipset = ide_generic;
1456 for (unit = 0; unit < MAX_DRIVES; ++unit)
1457 if (hwif->drives[unit].present)
Bartlomiej Zolnierkiewicz8604aff2005-05-26 14:55:34 +02001458 device_register(&hwif->drives[unit].gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459 }
1460 }
1461 return 0;
1462}
1463
1464EXPORT_SYMBOL_GPL(ideprobe_init);