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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/ide/ide-probe.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/ide/ide-probe.c')
-rw-r--r--drivers/ide/ide-probe.c1421
1 files changed, 1421 insertions, 0 deletions
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
new file mode 100644
index 000000000000..554473a95cf7
--- /dev/null
+++ b/drivers/ide/ide-probe.c
@@ -0,0 +1,1421 @@
1/*
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>
50#include <linux/spinlock.h>
51#include <linux/kmod.h>
52#include <linux/pci.h>
53
54#include <asm/byteorder.h>
55#include <asm/irq.h>
56#include <asm/uaccess.h>
57#include <asm/io.h>
58
59/**
60 * generic_id - add a generic drive id
61 * @drive: drive to make an ID block for
62 *
63 * Add a fake id field to the drive we are passed. This allows
64 * use to skip a ton of NULL checks (which people always miss)
65 * and make drive properties unconditional outside of this file
66 */
67
68static void generic_id(ide_drive_t *drive)
69{
70 drive->id->cyls = drive->cyl;
71 drive->id->heads = drive->head;
72 drive->id->sectors = drive->sect;
73 drive->id->cur_cyls = drive->cyl;
74 drive->id->cur_heads = drive->head;
75 drive->id->cur_sectors = drive->sect;
76}
77
78static void ide_disk_init_chs(ide_drive_t *drive)
79{
80 struct hd_driveid *id = drive->id;
81
82 /* Extract geometry if we did not already have one for the drive */
83 if (!drive->cyl || !drive->head || !drive->sect) {
84 drive->cyl = drive->bios_cyl = id->cyls;
85 drive->head = drive->bios_head = id->heads;
86 drive->sect = drive->bios_sect = id->sectors;
87 }
88
89 /* Handle logical geometry translation by the drive */
90 if ((id->field_valid & 1) && id->cur_cyls &&
91 id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
92 drive->cyl = id->cur_cyls;
93 drive->head = id->cur_heads;
94 drive->sect = id->cur_sectors;
95 }
96
97 /* Use physical geometry if what we have still makes no sense */
98 if (drive->head > 16 && id->heads && id->heads <= 16) {
99 drive->cyl = id->cyls;
100 drive->head = id->heads;
101 drive->sect = id->sectors;
102 }
103}
104
105static void ide_disk_init_mult_count(ide_drive_t *drive)
106{
107 struct hd_driveid *id = drive->id;
108
109 drive->mult_count = 0;
110 if (id->max_multsect) {
111#ifdef CONFIG_IDEDISK_MULTI_MODE
112 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
113 id->multsect_valid = id->multsect ? 1 : 0;
114 drive->mult_req = id->multsect_valid ? id->max_multsect : INITIAL_MULT_COUNT;
115 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
116#else /* original, pre IDE-NFG, per request of AC */
117 drive->mult_req = INITIAL_MULT_COUNT;
118 if (drive->mult_req > id->max_multsect)
119 drive->mult_req = id->max_multsect;
120 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
121 drive->special.b.set_multmode = 1;
122#endif
123 }
124}
125
126/**
127 * drive_is_flashcard - check for compact flash
128 * @drive: drive to check
129 *
130 * CompactFlash cards and their brethern pretend to be removable
131 * hard disks, except:
132 * (1) they never have a slave unit, and
133 * (2) they don't have doorlock mechanisms.
134 * This test catches them, and is invoked elsewhere when setting
135 * appropriate config bits.
136 *
137 * FIXME: This treatment is probably applicable for *all* PCMCIA (PC CARD)
138 * devices, so in linux 2.3.x we should change this to just treat all
139 * PCMCIA drives this way, and get rid of the model-name tests below
140 * (too big of an interface change for 2.4.x).
141 * At that time, we might also consider parameterizing the timeouts and
142 * retries, since these are MUCH faster than mechanical drives. -M.Lord
143 */
144
145static inline int drive_is_flashcard (ide_drive_t *drive)
146{
147 struct hd_driveid *id = drive->id;
148
149 if (drive->removable) {
150 if (id->config == 0x848a) return 1; /* CompactFlash */
151 if (!strncmp(id->model, "KODAK ATA_FLASH", 15) /* Kodak */
152 || !strncmp(id->model, "Hitachi CV", 10) /* Hitachi */
153 || !strncmp(id->model, "SunDisk SDCFB", 13) /* old SanDisk */
154 || !strncmp(id->model, "SanDisk SDCFB", 13) /* SanDisk */
155 || !strncmp(id->model, "HAGIWARA HPC", 12) /* Hagiwara */
156 || !strncmp(id->model, "LEXAR ATA_FLASH", 15) /* Lexar */
157 || !strncmp(id->model, "ATA_FLASH", 9)) /* Simple Tech */
158 {
159 return 1; /* yes, it is a flash memory card */
160 }
161 }
162 return 0; /* no, it is not a flash memory card */
163}
164
165/**
166 * do_identify - identify a drive
167 * @drive: drive to identify
168 * @cmd: command used
169 *
170 * Called when we have issued a drive identify command to
171 * read and parse the results. This function is run with
172 * interrupts disabled.
173 */
174
175static inline void do_identify (ide_drive_t *drive, u8 cmd)
176{
177 ide_hwif_t *hwif = HWIF(drive);
178 int bswap = 1;
179 struct hd_driveid *id;
180
181 id = drive->id;
182 /* read 512 bytes of id info */
183 hwif->ata_input_data(drive, id, SECTOR_WORDS);
184
185 drive->id_read = 1;
186 local_irq_enable();
187 ide_fix_driveid(id);
188
189#if defined (CONFIG_SCSI_EATA_DMA) || defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
190 /*
191 * EATA SCSI controllers do a hardware ATA emulation:
192 * Ignore them if there is a driver for them available.
193 */
194 if ((id->model[0] == 'P' && id->model[1] == 'M') ||
195 (id->model[0] == 'S' && id->model[1] == 'K')) {
196 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
197 goto err_misc;
198 }
199#endif /* CONFIG_SCSI_EATA_DMA || CONFIG_SCSI_EATA_PIO */
200
201 /*
202 * WIN_IDENTIFY returns little-endian info,
203 * WIN_PIDENTIFY *usually* returns little-endian info.
204 */
205 if (cmd == WIN_PIDENTIFY) {
206 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
207 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
208 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
209 /* Vertos drives may still be weird */
210 bswap ^= 1;
211 }
212 ide_fixstring(id->model, sizeof(id->model), bswap);
213 ide_fixstring(id->fw_rev, sizeof(id->fw_rev), bswap);
214 ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
215
216 if (strstr(id->model, "E X A B Y T E N E S T"))
217 goto err_misc;
218
219 /* we depend on this a lot! */
220 id->model[sizeof(id->model)-1] = '\0';
221 printk("%s: %s, ", drive->name, id->model);
222 drive->present = 1;
223 drive->dead = 0;
224
225 /*
226 * Check for an ATAPI device
227 */
228 if (cmd == WIN_PIDENTIFY) {
229 u8 type = (id->config >> 8) & 0x1f;
230 printk("ATAPI ");
231 switch (type) {
232 case ide_floppy:
233 if (!strstr(id->model, "CD-ROM")) {
234 if (!strstr(id->model, "oppy") &&
235 !strstr(id->model, "poyp") &&
236 !strstr(id->model, "ZIP"))
237 printk("cdrom or floppy?, assuming ");
238 if (drive->media != ide_cdrom) {
239 printk ("FLOPPY");
240 drive->removable = 1;
241 break;
242 }
243 }
244 /* Early cdrom models used zero */
245 type = ide_cdrom;
246 case ide_cdrom:
247 drive->removable = 1;
248#ifdef CONFIG_PPC
249 /* kludge for Apple PowerBook internal zip */
250 if (!strstr(id->model, "CD-ROM") &&
251 strstr(id->model, "ZIP")) {
252 printk ("FLOPPY");
253 type = ide_floppy;
254 break;
255 }
256#endif
257 printk ("CD/DVD-ROM");
258 break;
259 case ide_tape:
260 printk ("TAPE");
261 break;
262 case ide_optical:
263 printk ("OPTICAL");
264 drive->removable = 1;
265 break;
266 default:
267 printk("UNKNOWN (type %d)", type);
268 break;
269 }
270 printk (" drive\n");
271 drive->media = type;
272 /* an ATAPI device ignores DRDY */
273 drive->ready_stat = 0;
274 return;
275 }
276
277 /*
278 * Not an ATAPI device: looks like a "regular" hard disk
279 */
280 if (id->config & (1<<7))
281 drive->removable = 1;
282
283 if (drive_is_flashcard(drive))
284 drive->is_flash = 1;
285 drive->media = ide_disk;
286 printk("%s DISK drive\n", (drive->is_flash) ? "CFA" : "ATA" );
287 QUIRK_LIST(drive);
288 return;
289
290err_misc:
291 kfree(id);
292 drive->present = 0;
293 return;
294}
295
296/**
297 * actual_try_to_identify - send ata/atapi identify
298 * @drive: drive to identify
299 * @cmd: command to use
300 *
301 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
302 * and waits for a response. It also monitors irqs while this is
303 * happening, in hope of automatically determining which one is
304 * being used by the interface.
305 *
306 * Returns: 0 device was identified
307 * 1 device timed-out (no response to identify request)
308 * 2 device aborted the command (refused to identify itself)
309 */
310
311static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
312{
313 ide_hwif_t *hwif = HWIF(drive);
314 int rc;
315 unsigned long hd_status;
316 unsigned long timeout;
317 u8 s = 0, a = 0;
318
319 /* take a deep breath */
320 msleep(50);
321
322 if (IDE_CONTROL_REG) {
323 a = hwif->INB(IDE_ALTSTATUS_REG);
324 s = hwif->INB(IDE_STATUS_REG);
325 if ((a ^ s) & ~INDEX_STAT) {
326 printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
327 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
328 /* ancient Seagate drives, broken interfaces */
329 hd_status = IDE_STATUS_REG;
330 } else {
331 /* use non-intrusive polling */
332 hd_status = IDE_ALTSTATUS_REG;
333 }
334 } else
335 hd_status = IDE_STATUS_REG;
336
337 /* set features register for atapi
338 * identify command to be sure of reply
339 */
340 if ((cmd == WIN_PIDENTIFY))
341 /* disable dma & overlap */
342 hwif->OUTB(0, IDE_FEATURE_REG);
343
344 /* ask drive for ID */
345 hwif->OUTB(cmd, IDE_COMMAND_REG);
346
347 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
348 timeout += jiffies;
349 do {
350 if (time_after(jiffies, timeout)) {
351 /* drive timed-out */
352 return 1;
353 }
354 /* give drive a breather */
355 msleep(50);
356 } while ((hwif->INB(hd_status)) & BUSY_STAT);
357
358 /* wait for IRQ and DRQ_STAT */
359 msleep(50);
360 if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
361 unsigned long flags;
362
363 /* local CPU only; some systems need this */
364 local_irq_save(flags);
365 /* drive returned ID */
366 do_identify(drive, cmd);
367 /* drive responded with ID */
368 rc = 0;
369 /* clear drive IRQ */
370 (void) hwif->INB(IDE_STATUS_REG);
371 local_irq_restore(flags);
372 } else {
373 /* drive refused ID */
374 rc = 2;
375 }
376 return rc;
377}
378
379/**
380 * try_to_identify - try to identify a drive
381 * @drive: drive to probe
382 * @cmd: command to use
383 *
384 * Issue the identify command and then do IRQ probing to
385 * complete the identification when needed by finding the
386 * IRQ the drive is attached to
387 */
388
389static int try_to_identify (ide_drive_t *drive, u8 cmd)
390{
391 ide_hwif_t *hwif = HWIF(drive);
392 int retval;
393 int autoprobe = 0;
394 unsigned long cookie = 0;
395
396 /*
397 * Disable device irq unless we need to
398 * probe for it. Otherwise we'll get spurious
399 * interrupts during the identify-phase that
400 * the irq handler isn't expecting.
401 */
402 if (IDE_CONTROL_REG) {
403 u8 ctl = drive->ctl | 2;
404 if (!hwif->irq) {
405 autoprobe = 1;
406 cookie = probe_irq_on();
407 /* enable device irq */
408 ctl &= ~2;
409 }
410 hwif->OUTB(ctl, IDE_CONTROL_REG);
411 }
412
413 retval = actual_try_to_identify(drive, cmd);
414
415 if (autoprobe) {
416 int irq;
417 /* mask device irq */
418 hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
419 /* clear drive IRQ */
420 (void) hwif->INB(IDE_STATUS_REG);
421 udelay(5);
422 irq = probe_irq_off(cookie);
423 if (!hwif->irq) {
424 if (irq > 0) {
425 hwif->irq = irq;
426 } else {
427 /* Mmmm.. multiple IRQs..
428 * don't know which was ours
429 */
430 printk("%s: IRQ probe failed (0x%lx)\n",
431 drive->name, cookie);
432 }
433 }
434 }
435 return retval;
436}
437
438
439/**
440 * do_probe - probe an IDE device
441 * @drive: drive to probe
442 * @cmd: command to use
443 *
444 * do_probe() has the difficult job of finding a drive if it exists,
445 * without getting hung up if it doesn't exist, without trampling on
446 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
447 *
448 * If a drive is "known" to exist (from CMOS or kernel parameters),
449 * but does not respond right away, the probe will "hang in there"
450 * for the maximum wait time (about 30 seconds), otherwise it will
451 * exit much more quickly.
452 *
453 * Returns: 0 device was identified
454 * 1 device timed-out (no response to identify request)
455 * 2 device aborted the command (refused to identify itself)
456 * 3 bad status from device (possible for ATAPI drives)
457 * 4 probe was not attempted because failure was obvious
458 */
459
460static int do_probe (ide_drive_t *drive, u8 cmd)
461{
462 int rc;
463 ide_hwif_t *hwif = HWIF(drive);
464
465 if (drive->present) {
466 /* avoid waiting for inappropriate probes */
467 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
468 return 4;
469 }
470#ifdef DEBUG
471 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
472 drive->name, drive->present, drive->media,
473 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
474#endif
475
476 /* needed for some systems
477 * (e.g. crw9624 as drive0 with disk as slave)
478 */
479 msleep(50);
480 SELECT_DRIVE(drive);
481 msleep(50);
482 if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
483 if (drive->select.b.unit != 0) {
484 /* exit with drive0 selected */
485 SELECT_DRIVE(&hwif->drives[0]);
486 /* allow BUSY_STAT to assert & clear */
487 msleep(50);
488 }
489 /* no i/f present: mmm.. this should be a 4 -ml */
490 return 3;
491 }
492
493 if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
494 drive->present || cmd == WIN_PIDENTIFY) {
495 /* send cmd and wait */
496 if ((rc = try_to_identify(drive, cmd))) {
497 /* failed: try again */
498 rc = try_to_identify(drive,cmd);
499 }
500 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
501 return 4;
502
503 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
504 ((drive->autotune == IDE_TUNE_DEFAULT) ||
505 (drive->autotune == IDE_TUNE_AUTO))) {
506 unsigned long timeout;
507 printk("%s: no response (status = 0x%02x), "
508 "resetting drive\n", drive->name,
509 hwif->INB(IDE_STATUS_REG));
510 msleep(50);
511 hwif->OUTB(drive->select.all, IDE_SELECT_REG);
512 msleep(50);
513 hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
514 timeout = jiffies;
515 while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
516 time_before(jiffies, timeout + WAIT_WORSTCASE))
517 msleep(50);
518 rc = try_to_identify(drive, cmd);
519 }
520 if (rc == 1)
521 printk("%s: no response (status = 0x%02x)\n",
522 drive->name, hwif->INB(IDE_STATUS_REG));
523 /* ensure drive irq is clear */
524 (void) hwif->INB(IDE_STATUS_REG);
525 } else {
526 /* not present or maybe ATAPI */
527 rc = 3;
528 }
529 if (drive->select.b.unit != 0) {
530 /* exit with drive0 selected */
531 SELECT_DRIVE(&hwif->drives[0]);
532 msleep(50);
533 /* ensure drive irq is clear */
534 (void) hwif->INB(IDE_STATUS_REG);
535 }
536 return rc;
537}
538
539/*
540 *
541 */
542static void enable_nest (ide_drive_t *drive)
543{
544 ide_hwif_t *hwif = HWIF(drive);
545 unsigned long timeout;
546
547 printk("%s: enabling %s -- ", hwif->name, drive->id->model);
548 SELECT_DRIVE(drive);
549 msleep(50);
550 hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
551 timeout = jiffies + WAIT_WORSTCASE;
552 do {
553 if (time_after(jiffies, timeout)) {
554 printk("failed (timeout)\n");
555 return;
556 }
557 msleep(50);
558 } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
559
560 msleep(50);
561
562 if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
563 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
564 } else {
565 printk("success\n");
566 }
567
568 /* if !(success||timed-out) */
569 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
570 /* look for ATAPI device */
571 (void) do_probe(drive, WIN_PIDENTIFY);
572 }
573}
574
575/**
576 * probe_for_drives - upper level drive probe
577 * @drive: drive to probe for
578 *
579 * probe_for_drive() tests for existence of a given drive using do_probe()
580 * and presents things to the user as needed.
581 *
582 * Returns: 0 no device was found
583 * 1 device was found (note: drive->present might
584 * still be 0)
585 */
586
587static inline u8 probe_for_drive (ide_drive_t *drive)
588{
589 /*
590 * In order to keep things simple we have an id
591 * block for all drives at all times. If the device
592 * is pre ATA or refuses ATA/ATAPI identify we
593 * will add faked data to this.
594 *
595 * Also note that 0 everywhere means "can't do X"
596 */
597
598 drive->id = kmalloc(SECTOR_WORDS *4, GFP_KERNEL);
599 drive->id_read = 0;
600 if(drive->id == NULL)
601 {
602 printk(KERN_ERR "ide: out of memory for id data.\n");
603 return 0;
604 }
605 memset(drive->id, 0, SECTOR_WORDS * 4);
606 strcpy(drive->id->model, "UNKNOWN");
607
608 /* skip probing? */
609 if (!drive->noprobe)
610 {
611 /* if !(success||timed-out) */
612 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
613 /* look for ATAPI device */
614 (void) do_probe(drive, WIN_PIDENTIFY);
615 }
616 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
617 enable_nest(drive);
618 if (!drive->present)
619 /* drive not found */
620 return 0;
621
622 /* identification failed? */
623 if (!drive->id_read) {
624 if (drive->media == ide_disk) {
625 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
626 drive->name, drive->cyl,
627 drive->head, drive->sect);
628 } else if (drive->media == ide_cdrom) {
629 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
630 } else {
631 /* nuke it */
632 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
633 drive->present = 0;
634 }
635 }
636 /* drive was found */
637 }
638 if(!drive->present)
639 return 0;
640 /* The drive wasn't being helpful. Add generic info only */
641 if (drive->id_read == 0) {
642 generic_id(drive);
643 return 1;
644 }
645
646 if (drive->media == ide_disk) {
647 ide_disk_init_chs(drive);
648 ide_disk_init_mult_count(drive);
649 }
650
651 return drive->present;
652}
653
654static void hwif_release_dev (struct device *dev)
655{
656 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
657
658 up(&hwif->gendev_rel_sem);
659}
660
661static void hwif_register (ide_hwif_t *hwif)
662{
663 /* register with global device tree */
664 strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
665 hwif->gendev.driver_data = hwif;
666 if (hwif->gendev.parent == NULL) {
667 if (hwif->pci_dev)
668 hwif->gendev.parent = &hwif->pci_dev->dev;
669 else
670 /* Would like to do = &device_legacy */
671 hwif->gendev.parent = NULL;
672 }
673 hwif->gendev.release = hwif_release_dev;
674 device_register(&hwif->gendev);
675}
676
677static int wait_hwif_ready(ide_hwif_t *hwif)
678{
679 int rc;
680
681 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
682
683 /* Let HW settle down a bit from whatever init state we
684 * come from */
685 mdelay(2);
686
687 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
688 * I know of at least one disk who takes 31 seconds, I use 35
689 * here to be safe
690 */
691 rc = ide_wait_not_busy(hwif, 35000);
692 if (rc)
693 return rc;
694
695 /* Now make sure both master & slave are ready */
696 SELECT_DRIVE(&hwif->drives[0]);
697 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
698 mdelay(2);
699 rc = ide_wait_not_busy(hwif, 10000);
700 if (rc)
701 return rc;
702 SELECT_DRIVE(&hwif->drives[1]);
703 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
704 mdelay(2);
705 rc = ide_wait_not_busy(hwif, 10000);
706
707 /* Exit function with master reselected (let's be sane) */
708 SELECT_DRIVE(&hwif->drives[0]);
709
710 return rc;
711}
712
713/**
714 * ide_undecoded_slave - look for bad CF adapters
715 * @hwif: interface
716 *
717 * Analyse the drives on the interface and attempt to decide if we
718 * have the same drive viewed twice. This occurs with crap CF adapters
719 * and PCMCIA sometimes.
720 */
721
722void ide_undecoded_slave(ide_hwif_t *hwif)
723{
724 ide_drive_t *drive0 = &hwif->drives[0];
725 ide_drive_t *drive1 = &hwif->drives[1];
726
727 if (drive0->present == 0 || drive1->present == 0)
728 return;
729
730 /* If the models don't match they are not the same product */
731 if (strcmp(drive0->id->model, drive1->id->model))
732 return;
733
734 /* Serial numbers do not match */
735 if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
736 return;
737
738 /* No serial number, thankfully very rare for CF */
739 if (drive0->id->serial_no[0] == 0)
740 return;
741
742 /* Appears to be an IDE flash adapter with decode bugs */
743 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
744
745 drive1->present = 0;
746}
747
748EXPORT_SYMBOL_GPL(ide_undecoded_slave);
749
750/*
751 * This routine only knows how to look for drive units 0 and 1
752 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
753 */
754static void probe_hwif(ide_hwif_t *hwif)
755{
756 unsigned int unit;
757 unsigned long flags;
758 unsigned int irqd;
759
760 if (hwif->noprobe)
761 return;
762
763 if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
764 (ide_hwif_request_regions(hwif))) {
765 u16 msgout = 0;
766 for (unit = 0; unit < MAX_DRIVES; ++unit) {
767 ide_drive_t *drive = &hwif->drives[unit];
768 if (drive->present) {
769 drive->present = 0;
770 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
771 drive->name);
772 msgout = 1;
773 }
774 }
775 if (!msgout)
776 printk(KERN_ERR "%s: ports already in use, skipping probe\n",
777 hwif->name);
778 return;
779 }
780
781 /*
782 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
783 * we'll install our IRQ driver much later...
784 */
785 irqd = hwif->irq;
786 if (irqd)
787 disable_irq(hwif->irq);
788
789 local_irq_set(flags);
790
791 /* This is needed on some PPCs and a bunch of BIOS-less embedded
792 * platforms. Typical cases are:
793 *
794 * - The firmware hard reset the disk before booting the kernel,
795 * the drive is still doing it's poweron-reset sequence, that
796 * can take up to 30 seconds
797 * - The firmware does nothing (or no firmware), the device is
798 * still in POST state (same as above actually).
799 * - Some CD/DVD/Writer combo drives tend to drive the bus during
800 * their reset sequence even when they are non-selected slave
801 * devices, thus preventing discovery of the main HD
802 *
803 * Doing this wait-for-busy should not harm any existing configuration
804 * (at least things won't be worse than what current code does, that
805 * is blindly go & talk to the drive) and fix some issues like the
806 * above.
807 *
808 * BenH.
809 */
810 if (wait_hwif_ready(hwif) == -EBUSY)
811 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
812
813 /*
814 * Second drive should only exist if first drive was found,
815 * but a lot of cdrom drives are configured as single slaves.
816 */
817 for (unit = 0; unit < MAX_DRIVES; ++unit) {
818 ide_drive_t *drive = &hwif->drives[unit];
819 drive->dn = (hwif->channel ? 2 : 0) + unit;
820 (void) probe_for_drive(drive);
821 if (drive->present && !hwif->present) {
822 hwif->present = 1;
823 if (hwif->chipset != ide_4drives ||
824 !hwif->mate ||
825 !hwif->mate->present) {
826 hwif_register(hwif);
827 }
828 }
829 }
830 if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
831 unsigned long timeout = jiffies + WAIT_WORSTCASE;
832 u8 stat;
833
834 printk(KERN_WARNING "%s: reset\n", hwif->name);
835 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
836 udelay(10);
837 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
838 do {
839 msleep(50);
840 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
841 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
842
843 }
844 local_irq_restore(flags);
845 /*
846 * Use cached IRQ number. It might be (and is...) changed by probe
847 * code above
848 */
849 if (irqd)
850 enable_irq(irqd);
851
852 if (!hwif->present) {
853 ide_hwif_release_regions(hwif);
854 return;
855 }
856
857 for (unit = 0; unit < MAX_DRIVES; ++unit) {
858 ide_drive_t *drive = &hwif->drives[unit];
859
860 if (drive->present) {
861 if (hwif->tuneproc != NULL &&
862 drive->autotune == IDE_TUNE_AUTO)
863 /* auto-tune PIO mode */
864 hwif->tuneproc(drive, 255);
865
866 if (drive->autotune != IDE_TUNE_DEFAULT &&
867 drive->autotune != IDE_TUNE_AUTO)
868 continue;
869
870 drive->nice1 = 1;
871
872 /*
873 * MAJOR HACK BARF :-/
874 *
875 * FIXME: chipsets own this cruft!
876 */
877 /*
878 * Move here to prevent module loading clashing.
879 */
880 // drive->autodma = hwif->autodma;
881 if (hwif->ide_dma_check) {
882 /*
883 * Force DMAing for the beginning of the check.
884 * Some chipsets appear to do interesting
885 * things, if not checked and cleared.
886 * PARANOIA!!!
887 */
888 hwif->ide_dma_off_quietly(drive);
889#ifdef CONFIG_IDEDMA_ONLYDISK
890 if (drive->media == ide_disk)
891#endif
892 hwif->ide_dma_check(drive);
893 }
894 }
895 }
896}
897
898static int hwif_init(ide_hwif_t *hwif);
899
900int probe_hwif_init_with_fixup(ide_hwif_t *hwif, void (*fixup)(ide_hwif_t *hwif))
901{
902 probe_hwif(hwif);
903
904 if (fixup)
905 fixup(hwif);
906
907 if (!hwif_init(hwif)) {
908 printk(KERN_INFO "%s: failed to initialize IDE interface\n",
909 hwif->name);
910 return -1;
911 }
912
913 if (hwif->present) {
914 u16 unit = 0;
915 for (unit = 0; unit < MAX_DRIVES; ++unit) {
916 ide_drive_t *drive = &hwif->drives[unit];
917 /* For now don't attach absent drives, we may
918 want them on default or a new "empty" class
919 for hotplug reprobing ? */
920 if (drive->present) {
921 ata_attach(drive);
922 }
923 }
924 }
925 return 0;
926}
927
928int probe_hwif_init(ide_hwif_t *hwif)
929{
930 return probe_hwif_init_with_fixup(hwif, NULL);
931}
932
933EXPORT_SYMBOL(probe_hwif_init);
934
935#if MAX_HWIFS > 1
936/*
937 * save_match() is used to simplify logic in init_irq() below.
938 *
939 * A loophole here is that we may not know about a particular
940 * hwif's irq until after that hwif is actually probed/initialized..
941 * This could be a problem for the case where an hwif is on a
942 * dual interface that requires serialization (eg. cmd640) and another
943 * hwif using one of the same irqs is initialized beforehand.
944 *
945 * This routine detects and reports such situations, but does not fix them.
946 */
947static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
948{
949 ide_hwif_t *m = *match;
950
951 if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
952 if (!new->hwgroup)
953 return;
954 printk("%s: potential irq problem with %s and %s\n",
955 hwif->name, new->name, m->name);
956 }
957 if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
958 *match = new;
959}
960#endif /* MAX_HWIFS > 1 */
961
962/*
963 * init request queue
964 */
965static int ide_init_queue(ide_drive_t *drive)
966{
967 request_queue_t *q;
968 ide_hwif_t *hwif = HWIF(drive);
969 int max_sectors = 256;
970 int max_sg_entries = PRD_ENTRIES;
971
972 /*
973 * Our default set up assumes the normal IDE case,
974 * that is 64K segmenting, standard PRD setup
975 * and LBA28. Some drivers then impose their own
976 * limits and LBA48 we could raise it but as yet
977 * do not.
978 */
979
980 q = blk_init_queue(do_ide_request, &ide_lock);
981 if (!q)
982 return 1;
983
984 q->queuedata = drive;
985 blk_queue_segment_boundary(q, 0xffff);
986
987 if (!hwif->rqsize) {
988 if (hwif->no_lba48 || hwif->no_lba48_dma)
989 hwif->rqsize = 256;
990 else
991 hwif->rqsize = 65536;
992 }
993 if (hwif->rqsize < max_sectors)
994 max_sectors = hwif->rqsize;
995 blk_queue_max_sectors(q, max_sectors);
996
997#ifdef CONFIG_PCI
998 /* When we have an IOMMU, we may have a problem where pci_map_sg()
999 * creates segments that don't completely match our boundary
1000 * requirements and thus need to be broken up again. Because it
1001 * doesn't align properly either, we may actually have to break up
1002 * to more segments than what was we got in the first place, a max
1003 * worst case is twice as many.
1004 * This will be fixed once we teach pci_map_sg() about our boundary
1005 * requirements, hopefully soon. *FIXME*
1006 */
1007 if (!PCI_DMA_BUS_IS_PHYS)
1008 max_sg_entries >>= 1;
1009#endif /* CONFIG_PCI */
1010
1011 blk_queue_max_hw_segments(q, max_sg_entries);
1012 blk_queue_max_phys_segments(q, max_sg_entries);
1013
1014 /* assign drive queue */
1015 drive->queue = q;
1016
1017 /* needs drive->queue to be set */
1018 ide_toggle_bounce(drive, 1);
1019
1020 /* enable led activity for disk drives only */
1021 if (drive->media == ide_disk && hwif->led_act)
1022 blk_queue_activity_fn(q, hwif->led_act, drive);
1023
1024 return 0;
1025}
1026
1027/*
1028 * This routine sets up the irq for an ide interface, and creates a new
1029 * hwgroup for the irq/hwif if none was previously assigned.
1030 *
1031 * Much of the code is for correctly detecting/handling irq sharing
1032 * and irq serialization situations. This is somewhat complex because
1033 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1034 *
1035 * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
1036 * interrupts completely disabled. This can be bad for interrupt latency,
1037 * but anything else has led to problems on some machines. We re-enable
1038 * interrupts as much as we can safely do in most places.
1039 */
1040static int init_irq (ide_hwif_t *hwif)
1041{
1042 unsigned int index;
1043 ide_hwgroup_t *hwgroup;
1044 ide_hwif_t *match = NULL;
1045
1046
1047 BUG_ON(in_interrupt());
1048 BUG_ON(irqs_disabled());
1049 down(&ide_cfg_sem);
1050 hwif->hwgroup = NULL;
1051#if MAX_HWIFS > 1
1052 /*
1053 * Group up with any other hwifs that share our irq(s).
1054 */
1055 for (index = 0; index < MAX_HWIFS; index++) {
1056 ide_hwif_t *h = &ide_hwifs[index];
1057 if (h->hwgroup) { /* scan only initialized hwif's */
1058 if (hwif->irq == h->irq) {
1059 hwif->sharing_irq = h->sharing_irq = 1;
1060 if (hwif->chipset != ide_pci ||
1061 h->chipset != ide_pci) {
1062 save_match(hwif, h, &match);
1063 }
1064 }
1065 if (hwif->serialized) {
1066 if (hwif->mate && hwif->mate->irq == h->irq)
1067 save_match(hwif, h, &match);
1068 }
1069 if (h->serialized) {
1070 if (h->mate && hwif->irq == h->mate->irq)
1071 save_match(hwif, h, &match);
1072 }
1073 }
1074 }
1075#endif /* MAX_HWIFS > 1 */
1076 /*
1077 * If we are still without a hwgroup, then form a new one
1078 */
1079 if (match) {
1080 hwgroup = match->hwgroup;
1081 hwif->hwgroup = hwgroup;
1082 /*
1083 * Link us into the hwgroup.
1084 * This must be done early, do ensure that unexpected_intr
1085 * can find the hwif and prevent irq storms.
1086 * No drives are attached to the new hwif, choose_drive
1087 * can't do anything stupid (yet).
1088 * Add ourself as the 2nd entry to the hwgroup->hwif
1089 * linked list, the first entry is the hwif that owns
1090 * hwgroup->handler - do not change that.
1091 */
1092 spin_lock_irq(&ide_lock);
1093 hwif->next = hwgroup->hwif->next;
1094 hwgroup->hwif->next = hwif;
1095 spin_unlock_irq(&ide_lock);
1096 } else {
1097 hwgroup = kmalloc(sizeof(ide_hwgroup_t),GFP_KERNEL);
1098 if (!hwgroup)
1099 goto out_up;
1100
1101 hwif->hwgroup = hwgroup;
1102
1103 memset(hwgroup, 0, sizeof(ide_hwgroup_t));
1104 hwgroup->hwif = hwif->next = hwif;
1105 hwgroup->rq = NULL;
1106 hwgroup->handler = NULL;
1107 hwgroup->drive = NULL;
1108 hwgroup->busy = 0;
1109 init_timer(&hwgroup->timer);
1110 hwgroup->timer.function = &ide_timer_expiry;
1111 hwgroup->timer.data = (unsigned long) hwgroup;
1112 }
1113
1114 /*
1115 * Allocate the irq, if not already obtained for another hwif
1116 */
1117 if (!match || match->irq != hwif->irq) {
1118 int sa = SA_INTERRUPT;
1119#if defined(__mc68000__) || defined(CONFIG_APUS)
1120 sa = SA_SHIRQ;
1121#endif /* __mc68000__ || CONFIG_APUS */
1122
1123 if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
1124 sa = SA_SHIRQ;
1125#ifndef CONFIG_IDEPCI_SHARE_IRQ
1126 sa |= SA_INTERRUPT;
1127#endif /* CONFIG_IDEPCI_SHARE_IRQ */
1128 }
1129
1130 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1131 /* clear nIEN */
1132 hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1133
1134 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1135 goto out_unlink;
1136 }
1137
1138 /*
1139 * For any present drive:
1140 * - allocate the block device queue
1141 * - link drive into the hwgroup
1142 */
1143 for (index = 0; index < MAX_DRIVES; ++index) {
1144 ide_drive_t *drive = &hwif->drives[index];
1145 if (!drive->present)
1146 continue;
1147 if (ide_init_queue(drive)) {
1148 printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1149 continue;
1150 }
1151 spin_lock_irq(&ide_lock);
1152 if (!hwgroup->drive) {
1153 /* first drive for hwgroup. */
1154 drive->next = drive;
1155 hwgroup->drive = drive;
1156 hwgroup->hwif = HWIF(hwgroup->drive);
1157 } else {
1158 drive->next = hwgroup->drive->next;
1159 hwgroup->drive->next = drive;
1160 }
1161 spin_unlock_irq(&ide_lock);
1162 }
1163
1164#if !defined(__mc68000__) && !defined(CONFIG_APUS) && !defined(__sparc__)
1165 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1166 hwif->io_ports[IDE_DATA_OFFSET],
1167 hwif->io_ports[IDE_DATA_OFFSET]+7,
1168 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1169#elif defined(__sparc__)
1170 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %s", hwif->name,
1171 hwif->io_ports[IDE_DATA_OFFSET],
1172 hwif->io_ports[IDE_DATA_OFFSET]+7,
1173 hwif->io_ports[IDE_CONTROL_OFFSET], __irq_itoa(hwif->irq));
1174#else
1175 printk("%s at 0x%08lx on irq %d", hwif->name,
1176 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1177#endif /* __mc68000__ && CONFIG_APUS */
1178 if (match)
1179 printk(" (%sed with %s)",
1180 hwif->sharing_irq ? "shar" : "serializ", match->name);
1181 printk("\n");
1182 up(&ide_cfg_sem);
1183 return 0;
1184out_unlink:
1185 spin_lock_irq(&ide_lock);
1186 if (hwif->next == hwif) {
1187 BUG_ON(match);
1188 BUG_ON(hwgroup->hwif != hwif);
1189 kfree(hwgroup);
1190 } else {
1191 ide_hwif_t *g;
1192 g = hwgroup->hwif;
1193 while (g->next != hwif)
1194 g = g->next;
1195 g->next = hwif->next;
1196 if (hwgroup->hwif == hwif) {
1197 /* Impossible. */
1198 printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1199 hwgroup->hwif = g;
1200 }
1201 BUG_ON(hwgroup->hwif == hwif);
1202 }
1203 spin_unlock_irq(&ide_lock);
1204out_up:
1205 up(&ide_cfg_sem);
1206 return 1;
1207}
1208
1209static int ata_lock(dev_t dev, void *data)
1210{
1211 /* FIXME: we want to pin hwif down */
1212 return 0;
1213}
1214
1215static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1216{
1217 ide_hwif_t *hwif = data;
1218 int unit = *part >> PARTN_BITS;
1219 ide_drive_t *drive = &hwif->drives[unit];
1220 if (!drive->present)
1221 return NULL;
1222
1223 if (drive->media == ide_disk)
1224 request_module("ide-disk");
1225 if (drive->scsi)
1226 request_module("ide-scsi");
1227 if (drive->media == ide_cdrom || drive->media == ide_optical)
1228 request_module("ide-cd");
1229 if (drive->media == ide_tape)
1230 request_module("ide-tape");
1231 if (drive->media == ide_floppy)
1232 request_module("ide-floppy");
1233
1234 return NULL;
1235}
1236
1237static struct kobject *exact_match(dev_t dev, int *part, void *data)
1238{
1239 struct gendisk *p = data;
1240 *part &= (1 << PARTN_BITS) - 1;
1241 return &p->kobj;
1242}
1243
1244static int exact_lock(dev_t dev, void *data)
1245{
1246 struct gendisk *p = data;
1247
1248 if (!get_disk(p))
1249 return -1;
1250 return 0;
1251}
1252
1253void ide_register_region(struct gendisk *disk)
1254{
1255 blk_register_region(MKDEV(disk->major, disk->first_minor),
1256 disk->minors, NULL, exact_match, exact_lock, disk);
1257}
1258
1259EXPORT_SYMBOL_GPL(ide_register_region);
1260
1261void ide_unregister_region(struct gendisk *disk)
1262{
1263 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1264 disk->minors);
1265}
1266
1267EXPORT_SYMBOL_GPL(ide_unregister_region);
1268
1269void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1270{
1271 ide_hwif_t *hwif = drive->hwif;
1272 unsigned int unit = (drive->select.all >> 4) & 1;
1273
1274 disk->major = hwif->major;
1275 disk->first_minor = unit << PARTN_BITS;
1276 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1277 disk->queue = drive->queue;
1278}
1279
1280EXPORT_SYMBOL_GPL(ide_init_disk);
1281
1282static void drive_release_dev (struct device *dev)
1283{
1284 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1285
1286 up(&drive->gendev_rel_sem);
1287}
1288
1289/*
1290 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1291 * after probing for drives, to allocate partition tables and other data
1292 * structures needed for the routines in genhd.c. ide_geninit() gets called
1293 * somewhat later, during the partition check.
1294 */
1295static void init_gendisk (ide_hwif_t *hwif)
1296{
1297 unsigned int unit;
1298
1299 for (unit = 0; unit < MAX_DRIVES; ++unit) {
1300 ide_drive_t * drive = &hwif->drives[unit];
1301 ide_add_generic_settings(drive);
1302 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1303 hwif->index,unit);
1304 drive->gendev.parent = &hwif->gendev;
1305 drive->gendev.bus = &ide_bus_type;
1306 drive->gendev.driver_data = drive;
1307 drive->gendev.release = drive_release_dev;
1308 if (drive->present) {
1309 device_register(&drive->gendev);
1310 sprintf(drive->devfs_name, "ide/host%d/bus%d/target%d/lun%d",
1311 (hwif->channel && hwif->mate) ?
1312 hwif->mate->index : hwif->index,
1313 hwif->channel, unit, drive->lun);
1314 }
1315 }
1316 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1317 THIS_MODULE, ata_probe, ata_lock, hwif);
1318}
1319
1320static int hwif_init(ide_hwif_t *hwif)
1321{
1322 int old_irq;
1323
1324 /* Return success if no device is connected */
1325 if (!hwif->present)
1326 return 1;
1327
1328 if (!hwif->irq) {
1329 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1330 {
1331 printk("%s: DISABLED, NO IRQ\n", hwif->name);
1332 return (hwif->present = 0);
1333 }
1334 }
1335#ifdef CONFIG_BLK_DEV_HD
1336 if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1337 printk("%s: CANNOT SHARE IRQ WITH OLD "
1338 "HARDDISK DRIVER (hd.c)\n", hwif->name);
1339 return (hwif->present = 0);
1340 }
1341#endif /* CONFIG_BLK_DEV_HD */
1342
1343 /* we set it back to 1 if all is ok below */
1344 hwif->present = 0;
1345
1346 if (register_blkdev(hwif->major, hwif->name))
1347 return 0;
1348
1349 if (!hwif->sg_max_nents)
1350 hwif->sg_max_nents = PRD_ENTRIES;
1351
1352 hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1353 GFP_KERNEL);
1354 if (!hwif->sg_table) {
1355 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1356 goto out;
1357 }
1358
1359 if (init_irq(hwif) == 0)
1360 goto done;
1361
1362 old_irq = hwif->irq;
1363 /*
1364 * It failed to initialise. Find the default IRQ for
1365 * this port and try that.
1366 */
1367 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1368 printk("%s: Disabled unable to get IRQ %d.\n",
1369 hwif->name, old_irq);
1370 goto out;
1371 }
1372 if (init_irq(hwif)) {
1373 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1374 hwif->name, old_irq, hwif->irq);
1375 goto out;
1376 }
1377 printk("%s: probed IRQ %d failed, using default.\n",
1378 hwif->name, hwif->irq);
1379
1380done:
1381 init_gendisk(hwif);
1382 hwif->present = 1; /* success */
1383 return 1;
1384
1385out:
1386 unregister_blkdev(hwif->major, hwif->name);
1387 return 0;
1388}
1389
1390int ideprobe_init (void)
1391{
1392 unsigned int index;
1393 int probe[MAX_HWIFS];
1394
1395 memset(probe, 0, MAX_HWIFS * sizeof(int));
1396 for (index = 0; index < MAX_HWIFS; ++index)
1397 probe[index] = !ide_hwifs[index].present;
1398
1399 for (index = 0; index < MAX_HWIFS; ++index)
1400 if (probe[index])
1401 probe_hwif(&ide_hwifs[index]);
1402 for (index = 0; index < MAX_HWIFS; ++index)
1403 if (probe[index])
1404 hwif_init(&ide_hwifs[index]);
1405 for (index = 0; index < MAX_HWIFS; ++index) {
1406 if (probe[index]) {
1407 ide_hwif_t *hwif = &ide_hwifs[index];
1408 int unit;
1409 if (!hwif->present)
1410 continue;
1411 if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1412 hwif->chipset = ide_generic;
1413 for (unit = 0; unit < MAX_DRIVES; ++unit)
1414 if (hwif->drives[unit].present)
1415 ata_attach(&hwif->drives[unit]);
1416 }
1417 }
1418 return 0;
1419}
1420
1421EXPORT_SYMBOL_GPL(ideprobe_init);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 20:47:03 -0500