2 * linux/drivers/ide/ide-probe.c Version 1.11 Mar 05, 2003
4 * Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
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>
12 * See linux/MAINTAINERS for address of current maintainer.
14 * This is the IDE probe module, as evolved from hd.c and ide.c.
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
20 * Version 1.03 fix for (hwif->chipset == ide_4drives)
21 * Version 1.04 fixed buggy treatments of known flash memory cards
23 * Version 1.05 fix for (hwif->chipset == ide_pdc4030)
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
34 #undef REALLY_SLOW_IO /* most systems can safely undef this */
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>
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>
54 #include <asm/byteorder.h>
56 #include <asm/uaccess.h>
60 * generic_id - add a generic drive id
61 * @drive: drive to make an ID block for
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
68 static void generic_id(ide_drive_t *drive)
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;
78 static void ide_disk_init_chs(ide_drive_t *drive)
80 struct hd_driveid *id = drive->id;
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;
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;
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;
105 static void ide_disk_init_mult_count(ide_drive_t *drive)
107 struct hd_driveid *id = drive->id;
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;
127 * do_identify - identify a drive
128 * @drive: drive to identify
131 * Called when we have issued a drive identify command to
132 * read and parse the results. This function is run with
133 * interrupts disabled.
136 static inline void do_identify (ide_drive_t *drive, u8 cmd)
138 ide_hwif_t *hwif = HWIF(drive);
140 struct hd_driveid *id;
143 /* read 512 bytes of id info */
144 hwif->ata_input_data(drive, id, SECTOR_WORDS);
150 #if defined (CONFIG_SCSI_EATA_DMA) || defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
152 * EATA SCSI controllers do a hardware ATA emulation:
153 * Ignore them if there is a driver for them available.
155 if ((id->model[0] == 'P' && id->model[1] == 'M') ||
156 (id->model[0] == 'S' && id->model[1] == 'K')) {
157 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
160 #endif /* CONFIG_SCSI_EATA_DMA || CONFIG_SCSI_EATA_PIO */
163 * WIN_IDENTIFY returns little-endian info,
164 * WIN_PIDENTIFY *usually* returns little-endian info.
166 if (cmd == WIN_PIDENTIFY) {
167 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
168 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
169 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
170 /* Vertos drives may still be weird */
173 ide_fixstring(id->model, sizeof(id->model), bswap);
174 ide_fixstring(id->fw_rev, sizeof(id->fw_rev), bswap);
175 ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
177 if (strstr(id->model, "E X A B Y T E N E S T"))
180 /* we depend on this a lot! */
181 id->model[sizeof(id->model)-1] = '\0';
182 printk("%s: %s, ", drive->name, id->model);
187 * Check for an ATAPI device
189 if (cmd == WIN_PIDENTIFY) {
190 u8 type = (id->config >> 8) & 0x1f;
194 if (!strstr(id->model, "CD-ROM")) {
195 if (!strstr(id->model, "oppy") &&
196 !strstr(id->model, "poyp") &&
197 !strstr(id->model, "ZIP"))
198 printk("cdrom or floppy?, assuming ");
199 if (drive->media != ide_cdrom) {
201 drive->removable = 1;
205 /* Early cdrom models used zero */
208 drive->removable = 1;
210 /* kludge for Apple PowerBook internal zip */
211 if (!strstr(id->model, "CD-ROM") &&
212 strstr(id->model, "ZIP")) {
218 printk ("CD/DVD-ROM");
225 drive->removable = 1;
228 printk("UNKNOWN (type %d)", type);
233 /* an ATAPI device ignores DRDY */
234 drive->ready_stat = 0;
239 * Not an ATAPI device: looks like a "regular" hard disk
243 * 0x848a = CompactFlash device
244 * These are *not* removable in Linux definition of the term
247 if ((id->config != 0x848a) && (id->config & (1<<7)))
248 drive->removable = 1;
250 drive->media = ide_disk;
251 printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
262 * actual_try_to_identify - send ata/atapi identify
263 * @drive: drive to identify
264 * @cmd: command to use
266 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
267 * and waits for a response. It also monitors irqs while this is
268 * happening, in hope of automatically determining which one is
269 * being used by the interface.
271 * Returns: 0 device was identified
272 * 1 device timed-out (no response to identify request)
273 * 2 device aborted the command (refused to identify itself)
276 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
278 ide_hwif_t *hwif = HWIF(drive);
280 unsigned long hd_status;
281 unsigned long timeout;
284 /* take a deep breath */
287 if (IDE_CONTROL_REG) {
288 a = hwif->INB(IDE_ALTSTATUS_REG);
289 s = hwif->INB(IDE_STATUS_REG);
290 if ((a ^ s) & ~INDEX_STAT) {
291 printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
292 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
293 /* ancient Seagate drives, broken interfaces */
294 hd_status = IDE_STATUS_REG;
296 /* use non-intrusive polling */
297 hd_status = IDE_ALTSTATUS_REG;
300 hd_status = IDE_STATUS_REG;
302 /* set features register for atapi
303 * identify command to be sure of reply
305 if ((cmd == WIN_PIDENTIFY))
306 /* disable dma & overlap */
307 hwif->OUTB(0, IDE_FEATURE_REG);
309 /* ask drive for ID */
310 hwif->OUTB(cmd, IDE_COMMAND_REG);
312 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
315 if (time_after(jiffies, timeout)) {
316 /* drive timed-out */
319 /* give drive a breather */
321 } while ((hwif->INB(hd_status)) & BUSY_STAT);
323 /* wait for IRQ and DRQ_STAT */
325 if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
328 /* local CPU only; some systems need this */
329 local_irq_save(flags);
330 /* drive returned ID */
331 do_identify(drive, cmd);
332 /* drive responded with ID */
334 /* clear drive IRQ */
335 (void) hwif->INB(IDE_STATUS_REG);
336 local_irq_restore(flags);
338 /* drive refused ID */
345 * try_to_identify - try to identify a drive
346 * @drive: drive to probe
347 * @cmd: command to use
349 * Issue the identify command and then do IRQ probing to
350 * complete the identification when needed by finding the
351 * IRQ the drive is attached to
354 static int try_to_identify (ide_drive_t *drive, u8 cmd)
356 ide_hwif_t *hwif = HWIF(drive);
359 unsigned long cookie = 0;
362 * Disable device irq unless we need to
363 * probe for it. Otherwise we'll get spurious
364 * interrupts during the identify-phase that
365 * the irq handler isn't expecting.
367 if (IDE_CONTROL_REG) {
368 u8 ctl = drive->ctl | 2;
371 cookie = probe_irq_on();
372 /* enable device irq */
375 hwif->OUTB(ctl, IDE_CONTROL_REG);
378 retval = actual_try_to_identify(drive, cmd);
382 /* mask device irq */
383 hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
384 /* clear drive IRQ */
385 (void) hwif->INB(IDE_STATUS_REG);
387 irq = probe_irq_off(cookie);
392 /* Mmmm.. multiple IRQs..
393 * don't know which was ours
395 printk("%s: IRQ probe failed (0x%lx)\n",
396 drive->name, cookie);
405 * do_probe - probe an IDE device
406 * @drive: drive to probe
407 * @cmd: command to use
409 * do_probe() has the difficult job of finding a drive if it exists,
410 * without getting hung up if it doesn't exist, without trampling on
411 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
413 * If a drive is "known" to exist (from CMOS or kernel parameters),
414 * but does not respond right away, the probe will "hang in there"
415 * for the maximum wait time (about 30 seconds), otherwise it will
416 * exit much more quickly.
418 * Returns: 0 device was identified
419 * 1 device timed-out (no response to identify request)
420 * 2 device aborted the command (refused to identify itself)
421 * 3 bad status from device (possible for ATAPI drives)
422 * 4 probe was not attempted because failure was obvious
425 static int do_probe (ide_drive_t *drive, u8 cmd)
428 ide_hwif_t *hwif = HWIF(drive);
430 if (drive->present) {
431 /* avoid waiting for inappropriate probes */
432 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
436 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
437 drive->name, drive->present, drive->media,
438 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
441 /* needed for some systems
442 * (e.g. crw9624 as drive0 with disk as slave)
447 if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
448 if (drive->select.b.unit != 0) {
449 /* exit with drive0 selected */
450 SELECT_DRIVE(&hwif->drives[0]);
451 /* allow BUSY_STAT to assert & clear */
454 /* no i/f present: mmm.. this should be a 4 -ml */
458 if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
459 drive->present || cmd == WIN_PIDENTIFY) {
460 /* send cmd and wait */
461 if ((rc = try_to_identify(drive, cmd))) {
462 /* failed: try again */
463 rc = try_to_identify(drive,cmd);
465 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
468 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
469 ((drive->autotune == IDE_TUNE_DEFAULT) ||
470 (drive->autotune == IDE_TUNE_AUTO))) {
471 unsigned long timeout;
472 printk("%s: no response (status = 0x%02x), "
473 "resetting drive\n", drive->name,
474 hwif->INB(IDE_STATUS_REG));
476 hwif->OUTB(drive->select.all, IDE_SELECT_REG);
478 hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
480 while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
481 time_before(jiffies, timeout + WAIT_WORSTCASE))
483 rc = try_to_identify(drive, cmd);
486 printk("%s: no response (status = 0x%02x)\n",
487 drive->name, hwif->INB(IDE_STATUS_REG));
488 /* ensure drive irq is clear */
489 (void) hwif->INB(IDE_STATUS_REG);
491 /* not present or maybe ATAPI */
494 if (drive->select.b.unit != 0) {
495 /* exit with drive0 selected */
496 SELECT_DRIVE(&hwif->drives[0]);
498 /* ensure drive irq is clear */
499 (void) hwif->INB(IDE_STATUS_REG);
507 static void enable_nest (ide_drive_t *drive)
509 ide_hwif_t *hwif = HWIF(drive);
510 unsigned long timeout;
512 printk("%s: enabling %s -- ", hwif->name, drive->id->model);
515 hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
516 timeout = jiffies + WAIT_WORSTCASE;
518 if (time_after(jiffies, timeout)) {
519 printk("failed (timeout)\n");
523 } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
527 if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
528 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
533 /* if !(success||timed-out) */
534 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
535 /* look for ATAPI device */
536 (void) do_probe(drive, WIN_PIDENTIFY);
541 * probe_for_drives - upper level drive probe
542 * @drive: drive to probe for
544 * probe_for_drive() tests for existence of a given drive using do_probe()
545 * and presents things to the user as needed.
547 * Returns: 0 no device was found
548 * 1 device was found (note: drive->present might
552 static inline u8 probe_for_drive (ide_drive_t *drive)
555 * In order to keep things simple we have an id
556 * block for all drives at all times. If the device
557 * is pre ATA or refuses ATA/ATAPI identify we
558 * will add faked data to this.
560 * Also note that 0 everywhere means "can't do X"
563 drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
565 if(drive->id == NULL)
567 printk(KERN_ERR "ide: out of memory for id data.\n");
570 strcpy(drive->id->model, "UNKNOWN");
575 /* if !(success||timed-out) */
576 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
577 /* look for ATAPI device */
578 (void) do_probe(drive, WIN_PIDENTIFY);
580 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
583 /* drive not found */
586 /* identification failed? */
587 if (!drive->id_read) {
588 if (drive->media == ide_disk) {
589 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
590 drive->name, drive->cyl,
591 drive->head, drive->sect);
592 } else if (drive->media == ide_cdrom) {
593 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
596 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
600 /* drive was found */
604 /* The drive wasn't being helpful. Add generic info only */
605 if (drive->id_read == 0) {
610 if (drive->media == ide_disk) {
611 ide_disk_init_chs(drive);
612 ide_disk_init_mult_count(drive);
615 return drive->present;
618 static void hwif_release_dev (struct device *dev)
620 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
622 complete(&hwif->gendev_rel_comp);
625 static void hwif_register (ide_hwif_t *hwif)
627 /* register with global device tree */
628 strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
629 hwif->gendev.driver_data = hwif;
630 if (hwif->gendev.parent == NULL) {
632 hwif->gendev.parent = &hwif->pci_dev->dev;
634 /* Would like to do = &device_legacy */
635 hwif->gendev.parent = NULL;
637 hwif->gendev.release = hwif_release_dev;
638 device_register(&hwif->gendev);
641 static int wait_hwif_ready(ide_hwif_t *hwif)
645 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
647 /* Let HW settle down a bit from whatever init state we
651 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
652 * I know of at least one disk who takes 31 seconds, I use 35
655 rc = ide_wait_not_busy(hwif, 35000);
659 /* Now make sure both master & slave are ready */
660 SELECT_DRIVE(&hwif->drives[0]);
661 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
663 rc = ide_wait_not_busy(hwif, 35000);
666 SELECT_DRIVE(&hwif->drives[1]);
667 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
669 rc = ide_wait_not_busy(hwif, 35000);
671 /* Exit function with master reselected (let's be sane) */
672 SELECT_DRIVE(&hwif->drives[0]);
678 * ide_undecoded_slave - look for bad CF adapters
681 * Analyse the drives on the interface and attempt to decide if we
682 * have the same drive viewed twice. This occurs with crap CF adapters
683 * and PCMCIA sometimes.
686 void ide_undecoded_slave(ide_hwif_t *hwif)
688 ide_drive_t *drive0 = &hwif->drives[0];
689 ide_drive_t *drive1 = &hwif->drives[1];
691 if (drive0->present == 0 || drive1->present == 0)
694 /* If the models don't match they are not the same product */
695 if (strcmp(drive0->id->model, drive1->id->model))
698 /* Serial numbers do not match */
699 if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
702 /* No serial number, thankfully very rare for CF */
703 if (drive0->id->serial_no[0] == 0)
706 /* Appears to be an IDE flash adapter with decode bugs */
707 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
712 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
715 * This routine only knows how to look for drive units 0 and 1
716 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
718 static void probe_hwif(ide_hwif_t *hwif)
727 if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
728 (ide_hwif_request_regions(hwif))) {
730 for (unit = 0; unit < MAX_DRIVES; ++unit) {
731 ide_drive_t *drive = &hwif->drives[unit];
732 if (drive->present) {
734 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
740 printk(KERN_ERR "%s: ports already in use, skipping probe\n",
746 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
747 * we'll install our IRQ driver much later...
751 disable_irq(hwif->irq);
753 local_irq_set(flags);
755 /* This is needed on some PPCs and a bunch of BIOS-less embedded
756 * platforms. Typical cases are:
758 * - The firmware hard reset the disk before booting the kernel,
759 * the drive is still doing it's poweron-reset sequence, that
760 * can take up to 30 seconds
761 * - The firmware does nothing (or no firmware), the device is
762 * still in POST state (same as above actually).
763 * - Some CD/DVD/Writer combo drives tend to drive the bus during
764 * their reset sequence even when they are non-selected slave
765 * devices, thus preventing discovery of the main HD
767 * Doing this wait-for-busy should not harm any existing configuration
768 * (at least things won't be worse than what current code does, that
769 * is blindly go & talk to the drive) and fix some issues like the
774 if (wait_hwif_ready(hwif) == -EBUSY)
775 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
778 * Second drive should only exist if first drive was found,
779 * but a lot of cdrom drives are configured as single slaves.
781 for (unit = 0; unit < MAX_DRIVES; ++unit) {
782 ide_drive_t *drive = &hwif->drives[unit];
783 drive->dn = (hwif->channel ? 2 : 0) + unit;
784 (void) probe_for_drive(drive);
785 if (drive->present && !hwif->present) {
787 if (hwif->chipset != ide_4drives ||
789 !hwif->mate->present) {
794 if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
795 unsigned long timeout = jiffies + WAIT_WORSTCASE;
798 printk(KERN_WARNING "%s: reset\n", hwif->name);
799 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
801 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
804 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
805 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
808 local_irq_restore(flags);
810 * Use cached IRQ number. It might be (and is...) changed by probe
816 if (!hwif->present) {
817 ide_hwif_release_regions(hwif);
821 for (unit = 0; unit < MAX_DRIVES; ++unit) {
822 ide_drive_t *drive = &hwif->drives[unit];
824 if (drive->present) {
825 if (hwif->tuneproc != NULL &&
826 drive->autotune == IDE_TUNE_AUTO)
827 /* auto-tune PIO mode */
828 hwif->tuneproc(drive, 255);
830 if (drive->autotune != IDE_TUNE_DEFAULT &&
831 drive->autotune != IDE_TUNE_AUTO)
837 * MAJOR HACK BARF :-/
839 * FIXME: chipsets own this cruft!
842 * Move here to prevent module loading clashing.
844 // drive->autodma = hwif->autodma;
845 if (hwif->ide_dma_check) {
847 * Force DMAing for the beginning of the check.
848 * Some chipsets appear to do interesting
849 * things, if not checked and cleared.
852 hwif->ide_dma_off_quietly(drive);
853 #ifdef CONFIG_IDEDMA_ONLYDISK
854 if (drive->media == ide_disk)
856 hwif->ide_dma_check(drive);
861 for (unit = 0; unit < MAX_DRIVES; ++unit) {
862 ide_drive_t *drive = &hwif->drives[unit];
864 if (hwif->no_io_32bit)
865 drive->no_io_32bit = 1;
867 drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
871 static int hwif_init(ide_hwif_t *hwif);
873 int probe_hwif_init_with_fixup(ide_hwif_t *hwif, void (*fixup)(ide_hwif_t *hwif))
880 if (!hwif_init(hwif)) {
881 printk(KERN_INFO "%s: failed to initialize IDE interface\n",
888 for (unit = 0; unit < MAX_DRIVES; ++unit) {
889 ide_drive_t *drive = &hwif->drives[unit];
890 /* For now don't attach absent drives, we may
891 want them on default or a new "empty" class
892 for hotplug reprobing ? */
893 if (drive->present) {
894 device_register(&drive->gendev);
901 int probe_hwif_init(ide_hwif_t *hwif)
903 return probe_hwif_init_with_fixup(hwif, NULL);
906 EXPORT_SYMBOL(probe_hwif_init);
910 * save_match() is used to simplify logic in init_irq() below.
912 * A loophole here is that we may not know about a particular
913 * hwif's irq until after that hwif is actually probed/initialized..
914 * This could be a problem for the case where an hwif is on a
915 * dual interface that requires serialization (eg. cmd640) and another
916 * hwif using one of the same irqs is initialized beforehand.
918 * This routine detects and reports such situations, but does not fix them.
920 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
922 ide_hwif_t *m = *match;
924 if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
927 printk("%s: potential irq problem with %s and %s\n",
928 hwif->name, new->name, m->name);
930 if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
933 #endif /* MAX_HWIFS > 1 */
938 static int ide_init_queue(ide_drive_t *drive)
941 ide_hwif_t *hwif = HWIF(drive);
942 int max_sectors = 256;
943 int max_sg_entries = PRD_ENTRIES;
946 * Our default set up assumes the normal IDE case,
947 * that is 64K segmenting, standard PRD setup
948 * and LBA28. Some drivers then impose their own
949 * limits and LBA48 we could raise it but as yet
953 q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
957 q->queuedata = drive;
958 blk_queue_segment_boundary(q, 0xffff);
961 if (hwif->no_lba48 || hwif->no_lba48_dma)
964 hwif->rqsize = 65536;
966 if (hwif->rqsize < max_sectors)
967 max_sectors = hwif->rqsize;
968 blk_queue_max_sectors(q, max_sectors);
971 /* When we have an IOMMU, we may have a problem where pci_map_sg()
972 * creates segments that don't completely match our boundary
973 * requirements and thus need to be broken up again. Because it
974 * doesn't align properly either, we may actually have to break up
975 * to more segments than what was we got in the first place, a max
976 * worst case is twice as many.
977 * This will be fixed once we teach pci_map_sg() about our boundary
978 * requirements, hopefully soon. *FIXME*
980 if (!PCI_DMA_BUS_IS_PHYS)
981 max_sg_entries >>= 1;
982 #endif /* CONFIG_PCI */
984 blk_queue_max_hw_segments(q, max_sg_entries);
985 blk_queue_max_phys_segments(q, max_sg_entries);
987 /* assign drive queue */
990 /* needs drive->queue to be set */
991 ide_toggle_bounce(drive, 1);
993 /* enable led activity for disk drives only */
994 if (drive->media == ide_disk && hwif->led_act)
995 blk_queue_activity_fn(q, hwif->led_act, drive);
1001 * This routine sets up the irq for an ide interface, and creates a new
1002 * hwgroup for the irq/hwif if none was previously assigned.
1004 * Much of the code is for correctly detecting/handling irq sharing
1005 * and irq serialization situations. This is somewhat complex because
1006 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1008 * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
1009 * interrupts completely disabled. This can be bad for interrupt latency,
1010 * but anything else has led to problems on some machines. We re-enable
1011 * interrupts as much as we can safely do in most places.
1013 static int init_irq (ide_hwif_t *hwif)
1016 ide_hwgroup_t *hwgroup;
1017 ide_hwif_t *match = NULL;
1020 BUG_ON(in_interrupt());
1021 BUG_ON(irqs_disabled());
1022 BUG_ON(hwif == NULL);
1025 hwif->hwgroup = NULL;
1028 * Group up with any other hwifs that share our irq(s).
1030 for (index = 0; index < MAX_HWIFS; index++) {
1031 ide_hwif_t *h = &ide_hwifs[index];
1032 if (h->hwgroup) { /* scan only initialized hwif's */
1033 if (hwif->irq == h->irq) {
1034 hwif->sharing_irq = h->sharing_irq = 1;
1035 if (hwif->chipset != ide_pci ||
1036 h->chipset != ide_pci) {
1037 save_match(hwif, h, &match);
1040 if (hwif->serialized) {
1041 if (hwif->mate && hwif->mate->irq == h->irq)
1042 save_match(hwif, h, &match);
1044 if (h->serialized) {
1045 if (h->mate && hwif->irq == h->mate->irq)
1046 save_match(hwif, h, &match);
1050 #endif /* MAX_HWIFS > 1 */
1052 * If we are still without a hwgroup, then form a new one
1055 hwgroup = match->hwgroup;
1056 hwif->hwgroup = hwgroup;
1058 * Link us into the hwgroup.
1059 * This must be done early, do ensure that unexpected_intr
1060 * can find the hwif and prevent irq storms.
1061 * No drives are attached to the new hwif, choose_drive
1062 * can't do anything stupid (yet).
1063 * Add ourself as the 2nd entry to the hwgroup->hwif
1064 * linked list, the first entry is the hwif that owns
1065 * hwgroup->handler - do not change that.
1067 spin_lock_irq(&ide_lock);
1068 hwif->next = hwgroup->hwif->next;
1069 hwgroup->hwif->next = hwif;
1070 spin_unlock_irq(&ide_lock);
1072 hwgroup = kmalloc_node(sizeof(ide_hwgroup_t), GFP_KERNEL,
1073 hwif_to_node(hwif->drives[0].hwif));
1077 hwif->hwgroup = hwgroup;
1079 memset(hwgroup, 0, sizeof(ide_hwgroup_t));
1080 hwgroup->hwif = hwif->next = hwif;
1082 hwgroup->handler = NULL;
1083 hwgroup->drive = NULL;
1085 init_timer(&hwgroup->timer);
1086 hwgroup->timer.function = &ide_timer_expiry;
1087 hwgroup->timer.data = (unsigned long) hwgroup;
1091 * Allocate the irq, if not already obtained for another hwif
1093 if (!match || match->irq != hwif->irq) {
1094 int sa = SA_INTERRUPT;
1095 #if defined(__mc68000__) || defined(CONFIG_APUS)
1097 #endif /* __mc68000__ || CONFIG_APUS */
1099 if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
1101 #ifndef CONFIG_IDEPCI_SHARE_IRQ
1103 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
1106 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1108 hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1110 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1115 * For any present drive:
1116 * - allocate the block device queue
1117 * - link drive into the hwgroup
1119 for (index = 0; index < MAX_DRIVES; ++index) {
1120 ide_drive_t *drive = &hwif->drives[index];
1121 if (!drive->present)
1123 if (ide_init_queue(drive)) {
1124 printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1127 spin_lock_irq(&ide_lock);
1128 if (!hwgroup->drive) {
1129 /* first drive for hwgroup. */
1130 drive->next = drive;
1131 hwgroup->drive = drive;
1132 hwgroup->hwif = HWIF(hwgroup->drive);
1134 drive->next = hwgroup->drive->next;
1135 hwgroup->drive->next = drive;
1137 spin_unlock_irq(&ide_lock);
1140 #if !defined(__mc68000__) && !defined(CONFIG_APUS)
1141 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1142 hwif->io_ports[IDE_DATA_OFFSET],
1143 hwif->io_ports[IDE_DATA_OFFSET]+7,
1144 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1146 printk("%s at 0x%08lx on irq %d", hwif->name,
1147 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1148 #endif /* __mc68000__ && CONFIG_APUS */
1150 printk(" (%sed with %s)",
1151 hwif->sharing_irq ? "shar" : "serializ", match->name);
1156 spin_lock_irq(&ide_lock);
1157 if (hwif->next == hwif) {
1159 BUG_ON(hwgroup->hwif != hwif);
1164 while (g->next != hwif)
1166 g->next = hwif->next;
1167 if (hwgroup->hwif == hwif) {
1169 printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1172 BUG_ON(hwgroup->hwif == hwif);
1174 spin_unlock_irq(&ide_lock);
1180 static int ata_lock(dev_t dev, void *data)
1182 /* FIXME: we want to pin hwif down */
1186 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1188 ide_hwif_t *hwif = data;
1189 int unit = *part >> PARTN_BITS;
1190 ide_drive_t *drive = &hwif->drives[unit];
1191 if (!drive->present)
1194 if (drive->media == ide_disk)
1195 request_module("ide-disk");
1197 request_module("ide-scsi");
1198 if (drive->media == ide_cdrom || drive->media == ide_optical)
1199 request_module("ide-cd");
1200 if (drive->media == ide_tape)
1201 request_module("ide-tape");
1202 if (drive->media == ide_floppy)
1203 request_module("ide-floppy");
1208 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1210 struct gendisk *p = data;
1211 *part &= (1 << PARTN_BITS) - 1;
1215 static int exact_lock(dev_t dev, void *data)
1217 struct gendisk *p = data;
1224 void ide_register_region(struct gendisk *disk)
1226 blk_register_region(MKDEV(disk->major, disk->first_minor),
1227 disk->minors, NULL, exact_match, exact_lock, disk);
1230 EXPORT_SYMBOL_GPL(ide_register_region);
1232 void ide_unregister_region(struct gendisk *disk)
1234 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1238 EXPORT_SYMBOL_GPL(ide_unregister_region);
1240 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1242 ide_hwif_t *hwif = drive->hwif;
1243 unsigned int unit = (drive->select.all >> 4) & 1;
1245 disk->major = hwif->major;
1246 disk->first_minor = unit << PARTN_BITS;
1247 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1248 disk->queue = drive->queue;
1251 EXPORT_SYMBOL_GPL(ide_init_disk);
1253 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1255 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1257 if (drive == drive->next) {
1258 /* special case: last drive from hwgroup. */
1259 BUG_ON(hwgroup->drive != drive);
1260 hwgroup->drive = NULL;
1264 walk = hwgroup->drive;
1265 while (walk->next != drive)
1267 walk->next = drive->next;
1268 if (hwgroup->drive == drive) {
1269 hwgroup->drive = drive->next;
1270 hwgroup->hwif = hwgroup->drive->hwif;
1273 BUG_ON(hwgroup->drive == drive);
1276 static void drive_release_dev (struct device *dev)
1278 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1280 spin_lock_irq(&ide_lock);
1281 ide_remove_drive_from_hwgroup(drive);
1285 /* Messed up locking ... */
1286 spin_unlock_irq(&ide_lock);
1287 blk_cleanup_queue(drive->queue);
1288 spin_lock_irq(&ide_lock);
1289 drive->queue = NULL;
1290 spin_unlock_irq(&ide_lock);
1292 complete(&drive->gendev_rel_comp);
1296 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1297 * after probing for drives, to allocate partition tables and other data
1298 * structures needed for the routines in genhd.c. ide_geninit() gets called
1299 * somewhat later, during the partition check.
1301 static void init_gendisk (ide_hwif_t *hwif)
1305 for (unit = 0; unit < MAX_DRIVES; ++unit) {
1306 ide_drive_t * drive = &hwif->drives[unit];
1307 ide_add_generic_settings(drive);
1308 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1310 drive->gendev.parent = &hwif->gendev;
1311 drive->gendev.bus = &ide_bus_type;
1312 drive->gendev.driver_data = drive;
1313 drive->gendev.release = drive_release_dev;
1315 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1316 THIS_MODULE, ata_probe, ata_lock, hwif);
1319 static int hwif_init(ide_hwif_t *hwif)
1323 /* Return success if no device is connected */
1328 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1330 printk("%s: DISABLED, NO IRQ\n", hwif->name);
1331 return (hwif->present = 0);
1334 #ifdef CONFIG_BLK_DEV_HD
1335 if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1336 printk("%s: CANNOT SHARE IRQ WITH OLD "
1337 "HARDDISK DRIVER (hd.c)\n", hwif->name);
1338 return (hwif->present = 0);
1340 #endif /* CONFIG_BLK_DEV_HD */
1342 /* we set it back to 1 if all is ok below */
1345 if (register_blkdev(hwif->major, hwif->name))
1348 if (!hwif->sg_max_nents)
1349 hwif->sg_max_nents = PRD_ENTRIES;
1351 hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1353 if (!hwif->sg_table) {
1354 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1358 if (init_irq(hwif) == 0)
1361 old_irq = hwif->irq;
1363 * It failed to initialise. Find the default IRQ for
1364 * this port and try that.
1366 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1367 printk("%s: Disabled unable to get IRQ %d.\n",
1368 hwif->name, old_irq);
1371 if (init_irq(hwif)) {
1372 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1373 hwif->name, old_irq, hwif->irq);
1376 printk("%s: probed IRQ %d failed, using default.\n",
1377 hwif->name, hwif->irq);
1381 hwif->present = 1; /* success */
1385 unregister_blkdev(hwif->major, hwif->name);
1389 int ideprobe_init (void)
1392 int probe[MAX_HWIFS];
1394 memset(probe, 0, MAX_HWIFS * sizeof(int));
1395 for (index = 0; index < MAX_HWIFS; ++index)
1396 probe[index] = !ide_hwifs[index].present;
1398 for (index = 0; index < MAX_HWIFS; ++index)
1400 probe_hwif(&ide_hwifs[index]);
1401 for (index = 0; index < MAX_HWIFS; ++index)
1403 hwif_init(&ide_hwifs[index]);
1404 for (index = 0; index < MAX_HWIFS; ++index) {
1406 ide_hwif_t *hwif = &ide_hwifs[index];
1410 if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1411 hwif->chipset = ide_generic;
1412 for (unit = 0; unit < MAX_DRIVES; ++unit)
1413 if (hwif->drives[unit].present)
1414 device_register(&hwif->drives[unit].gendev);
1420 EXPORT_SYMBOL_GPL(ideprobe_init);