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;
79 * drive_is_flashcard - check for compact flash
80 * @drive: drive to check
82 * CompactFlash cards and their brethern pretend to be removable
84 * (1) they never have a slave unit, and
85 * (2) they don't have doorlock mechanisms.
86 * This test catches them, and is invoked elsewhere when setting
87 * appropriate config bits.
89 * FIXME: This treatment is probably applicable for *all* PCMCIA (PC CARD)
90 * devices, so in linux 2.3.x we should change this to just treat all
91 * PCMCIA drives this way, and get rid of the model-name tests below
92 * (too big of an interface change for 2.4.x).
93 * At that time, we might also consider parameterizing the timeouts and
94 * retries, since these are MUCH faster than mechanical drives. -M.Lord
97 static inline int drive_is_flashcard (ide_drive_t *drive)
99 struct hd_driveid *id = drive->id;
101 if (drive->removable) {
102 if (id->config == 0x848a) return 1; /* CompactFlash */
103 if (!strncmp(id->model, "KODAK ATA_FLASH", 15) /* Kodak */
104 || !strncmp(id->model, "Hitachi CV", 10) /* Hitachi */
105 || !strncmp(id->model, "SunDisk SDCFB", 13) /* old SanDisk */
106 || !strncmp(id->model, "SanDisk SDCFB", 13) /* SanDisk */
107 || !strncmp(id->model, "HAGIWARA HPC", 12) /* Hagiwara */
108 || !strncmp(id->model, "LEXAR ATA_FLASH", 15) /* Lexar */
109 || !strncmp(id->model, "ATA_FLASH", 9)) /* Simple Tech */
111 return 1; /* yes, it is a flash memory card */
114 return 0; /* no, it is not a flash memory card */
118 * do_identify - identify a drive
119 * @drive: drive to identify
122 * Called when we have issued a drive identify command to
123 * read and parse the results. This function is run with
124 * interrupts disabled.
127 static inline void do_identify (ide_drive_t *drive, u8 cmd)
129 ide_hwif_t *hwif = HWIF(drive);
131 struct hd_driveid *id;
134 /* read 512 bytes of id info */
135 hwif->ata_input_data(drive, id, SECTOR_WORDS);
141 #if defined (CONFIG_SCSI_EATA_DMA) || defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
143 * EATA SCSI controllers do a hardware ATA emulation:
144 * Ignore them if there is a driver for them available.
146 if ((id->model[0] == 'P' && id->model[1] == 'M') ||
147 (id->model[0] == 'S' && id->model[1] == 'K')) {
148 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
151 #endif /* CONFIG_SCSI_EATA_DMA || CONFIG_SCSI_EATA_PIO */
154 * WIN_IDENTIFY returns little-endian info,
155 * WIN_PIDENTIFY *usually* returns little-endian info.
157 if (cmd == WIN_PIDENTIFY) {
158 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
159 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
160 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
161 /* Vertos drives may still be weird */
164 ide_fixstring(id->model, sizeof(id->model), bswap);
165 ide_fixstring(id->fw_rev, sizeof(id->fw_rev), bswap);
166 ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
168 if (strstr(id->model, "E X A B Y T E N E S T"))
171 /* we depend on this a lot! */
172 id->model[sizeof(id->model)-1] = '\0';
173 printk("%s: %s, ", drive->name, id->model);
178 * Check for an ATAPI device
180 if (cmd == WIN_PIDENTIFY) {
181 u8 type = (id->config >> 8) & 0x1f;
183 #ifdef CONFIG_BLK_DEV_PDC4030
184 if (hwif->channel == 1 && hwif->chipset == ide_pdc4030) {
185 printk(" -- not supported on 2nd Promise port\n");
188 #endif /* CONFIG_BLK_DEV_PDC4030 */
191 if (!strstr(id->model, "CD-ROM")) {
192 if (!strstr(id->model, "oppy") &&
193 !strstr(id->model, "poyp") &&
194 !strstr(id->model, "ZIP"))
195 printk("cdrom or floppy?, assuming ");
196 if (drive->media != ide_cdrom) {
198 drive->removable = 1;
202 /* Early cdrom models used zero */
205 drive->removable = 1;
207 /* kludge for Apple PowerBook internal zip */
208 if (!strstr(id->model, "CD-ROM") &&
209 strstr(id->model, "ZIP")) {
215 printk ("CD/DVD-ROM");
222 drive->removable = 1;
225 printk("UNKNOWN (type %d)", type);
234 * Not an ATAPI device: looks like a "regular" hard disk
236 if (id->config & (1<<7))
237 drive->removable = 1;
239 if (drive_is_flashcard(drive))
241 drive->media = ide_disk;
242 printk("%s DISK drive\n", (drive->is_flash) ? "CFA" : "ATA" );
253 * actual_try_to_identify - send ata/atapi identify
254 * @drive: drive to identify
255 * @cmd: command to use
257 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
258 * and waits for a response. It also monitors irqs while this is
259 * happening, in hope of automatically determining which one is
260 * being used by the interface.
262 * Returns: 0 device was identified
263 * 1 device timed-out (no response to identify request)
264 * 2 device aborted the command (refused to identify itself)
267 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
269 ide_hwif_t *hwif = HWIF(drive);
271 unsigned long hd_status;
272 unsigned long timeout;
275 /* take a deep breath */
278 if (IDE_CONTROL_REG) {
279 a = hwif->INB(IDE_ALTSTATUS_REG);
280 s = hwif->INB(IDE_STATUS_REG);
281 if ((a ^ s) & ~INDEX_STAT) {
282 printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
283 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
284 /* ancient Seagate drives, broken interfaces */
285 hd_status = IDE_STATUS_REG;
287 /* use non-intrusive polling */
288 hd_status = IDE_ALTSTATUS_REG;
291 hd_status = IDE_STATUS_REG;
293 /* set features register for atapi
294 * identify command to be sure of reply
296 if ((cmd == WIN_PIDENTIFY))
297 /* disable dma & overlap */
298 hwif->OUTB(0, IDE_FEATURE_REG);
300 if (hwif->identify != NULL) {
301 if (hwif->identify(drive))
304 /* ask drive for ID */
305 hwif->OUTB(cmd, IDE_COMMAND_REG);
307 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
310 if (time_after(jiffies, timeout)) {
311 /* drive timed-out */
314 /* give drive a breather */
316 } while ((hwif->INB(hd_status)) & BUSY_STAT);
318 /* wait for IRQ and DRQ_STAT */
320 if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
323 /* local CPU only; some systems need this */
324 local_irq_save(flags);
325 /* drive returned ID */
326 do_identify(drive, cmd);
327 /* drive responded with ID */
329 /* clear drive IRQ */
330 (void) hwif->INB(IDE_STATUS_REG);
331 local_irq_restore(flags);
333 /* drive refused ID */
340 * try_to_identify - try to identify a drive
341 * @drive: drive to probe
342 * @cmd: command to use
344 * Issue the identify command and then do IRQ probing to
345 * complete the identification when needed by finding the
346 * IRQ the drive is attached to
349 static int try_to_identify (ide_drive_t *drive, u8 cmd)
351 ide_hwif_t *hwif = HWIF(drive);
354 unsigned long cookie = 0;
357 * Disable device irq unless we need to
358 * probe for it. Otherwise we'll get spurious
359 * interrupts during the identify-phase that
360 * the irq handler isn't expecting.
362 if (IDE_CONTROL_REG) {
363 u8 ctl = drive->ctl | 2;
366 cookie = probe_irq_on();
367 /* enable device irq */
370 hwif->OUTB(ctl, IDE_CONTROL_REG);
373 retval = actual_try_to_identify(drive, cmd);
377 /* mask device irq */
378 hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
379 /* clear drive IRQ */
380 (void) hwif->INB(IDE_STATUS_REG);
382 irq = probe_irq_off(cookie);
387 /* Mmmm.. multiple IRQs..
388 * don't know which was ours
390 printk("%s: IRQ probe failed (0x%lx)\n",
391 drive->name, cookie);
400 * do_probe - probe an IDE device
401 * @drive: drive to probe
402 * @cmd: command to use
404 * do_probe() has the difficult job of finding a drive if it exists,
405 * without getting hung up if it doesn't exist, without trampling on
406 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
408 * If a drive is "known" to exist (from CMOS or kernel parameters),
409 * but does not respond right away, the probe will "hang in there"
410 * for the maximum wait time (about 30 seconds), otherwise it will
411 * exit much more quickly.
413 * Returns: 0 device was identified
414 * 1 device timed-out (no response to identify request)
415 * 2 device aborted the command (refused to identify itself)
416 * 3 bad status from device (possible for ATAPI drives)
417 * 4 probe was not attempted because failure was obvious
420 static int do_probe (ide_drive_t *drive, u8 cmd)
423 ide_hwif_t *hwif = HWIF(drive);
425 if (drive->present) {
426 /* avoid waiting for inappropriate probes */
427 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
431 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
432 drive->name, drive->present, drive->media,
433 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
436 /* needed for some systems
437 * (e.g. crw9624 as drive0 with disk as slave)
442 if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
443 if (drive->select.b.unit != 0) {
444 /* exit with drive0 selected */
445 SELECT_DRIVE(&hwif->drives[0]);
446 /* allow BUSY_STAT to assert & clear */
449 /* no i/f present: mmm.. this should be a 4 -ml */
453 if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
454 drive->present || cmd == WIN_PIDENTIFY) {
455 /* send cmd and wait */
456 if ((rc = try_to_identify(drive, cmd))) {
457 /* failed: try again */
458 rc = try_to_identify(drive,cmd);
460 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
463 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
464 ((drive->autotune == IDE_TUNE_DEFAULT) ||
465 (drive->autotune == IDE_TUNE_AUTO))) {
466 unsigned long timeout;
467 printk("%s: no response (status = 0x%02x), "
468 "resetting drive\n", drive->name,
469 hwif->INB(IDE_STATUS_REG));
471 hwif->OUTB(drive->select.all, IDE_SELECT_REG);
473 hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
475 while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
476 time_before(jiffies, timeout + WAIT_WORSTCASE))
478 rc = try_to_identify(drive, cmd);
481 printk("%s: no response (status = 0x%02x)\n",
482 drive->name, hwif->INB(IDE_STATUS_REG));
483 /* ensure drive irq is clear */
484 (void) hwif->INB(IDE_STATUS_REG);
486 /* not present or maybe ATAPI */
489 if (drive->select.b.unit != 0) {
490 /* exit with drive0 selected */
491 SELECT_DRIVE(&hwif->drives[0]);
493 /* ensure drive irq is clear */
494 (void) hwif->INB(IDE_STATUS_REG);
502 static void enable_nest (ide_drive_t *drive)
504 ide_hwif_t *hwif = HWIF(drive);
505 unsigned long timeout;
507 printk("%s: enabling %s -- ", hwif->name, drive->id->model);
510 hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
511 timeout = jiffies + WAIT_WORSTCASE;
513 if (time_after(jiffies, timeout)) {
514 printk("failed (timeout)\n");
518 } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
522 if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
523 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
528 /* if !(success||timed-out) */
529 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
530 /* look for ATAPI device */
531 (void) do_probe(drive, WIN_PIDENTIFY);
536 * probe_for_drives - upper level drive probe
537 * @drive: drive to probe for
539 * probe_for_drive() tests for existence of a given drive using do_probe()
540 * and presents things to the user as needed.
542 * Returns: 0 no device was found
543 * 1 device was found (note: drive->present might
547 static inline u8 probe_for_drive (ide_drive_t *drive)
550 * In order to keep things simple we have an id
551 * block for all drives at all times. If the device
552 * is pre ATA or refuses ATA/ATAPI identify we
553 * will add faked data to this.
555 * Also note that 0 everywhere means "can't do X"
558 drive->id = kmalloc(SECTOR_WORDS *4, GFP_KERNEL);
560 if(drive->id == NULL)
562 printk(KERN_ERR "ide: out of memory for id data.\n");
565 memset(drive->id, 0, SECTOR_WORDS * 4);
566 strcpy(drive->id->model, "UNKNOWN");
571 /* if !(success||timed-out) */
572 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
573 /* look for ATAPI device */
574 (void) do_probe(drive, WIN_PIDENTIFY);
576 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
579 /* drive not found */
582 /* identification failed? */
583 if (!drive->id_read) {
584 if (drive->media == ide_disk) {
585 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
586 drive->name, drive->cyl,
587 drive->head, drive->sect);
588 } else if (drive->media == ide_cdrom) {
589 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
592 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
596 /* drive was found */
600 /* The drive wasn't being helpful. Add generic info only */
603 return drive->present;
606 static void hwif_release_dev (struct device *dev)
608 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
610 up(&hwif->gendev_rel_sem);
613 static void hwif_register (ide_hwif_t *hwif)
615 /* register with global device tree */
616 strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
617 hwif->gendev.driver_data = hwif;
618 if (hwif->gendev.parent == NULL) {
620 hwif->gendev.parent = &hwif->pci_dev->dev;
622 /* Would like to do = &device_legacy */
623 hwif->gendev.parent = NULL;
625 hwif->gendev.release = hwif_release_dev;
626 device_register(&hwif->gendev);
629 static int wait_hwif_ready(ide_hwif_t *hwif)
633 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
635 /* Let HW settle down a bit from whatever init state we
639 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
640 * I know of at least one disk who takes 31 seconds, I use 35
643 rc = ide_wait_not_busy(hwif, 35000);
647 /* Now make sure both master & slave are ready */
648 SELECT_DRIVE(&hwif->drives[0]);
649 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
651 rc = ide_wait_not_busy(hwif, 10000);
654 SELECT_DRIVE(&hwif->drives[1]);
655 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
657 rc = ide_wait_not_busy(hwif, 10000);
659 /* Exit function with master reselected (let's be sane) */
660 SELECT_DRIVE(&hwif->drives[0]);
666 * This routine only knows how to look for drive units 0 and 1
667 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
669 static void probe_hwif(ide_hwif_t *hwif)
678 if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
679 #ifdef CONFIG_BLK_DEV_PDC4030
680 (hwif->chipset != ide_pdc4030 || hwif->channel == 0) &&
681 #endif /* CONFIG_BLK_DEV_PDC4030 */
682 (ide_hwif_request_regions(hwif))) {
684 for (unit = 0; unit < MAX_DRIVES; ++unit) {
685 ide_drive_t *drive = &hwif->drives[unit];
686 if (drive->present) {
688 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
694 printk(KERN_ERR "%s: ports already in use, skipping probe\n",
700 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
701 * we'll install our IRQ driver much later...
705 disable_irq(hwif->irq);
707 local_irq_set(flags);
709 /* This is needed on some PPCs and a bunch of BIOS-less embedded
710 * platforms. Typical cases are:
712 * - The firmware hard reset the disk before booting the kernel,
713 * the drive is still doing it's poweron-reset sequence, that
714 * can take up to 30 seconds
715 * - The firmware does nothing (or no firmware), the device is
716 * still in POST state (same as above actually).
717 * - Some CD/DVD/Writer combo drives tend to drive the bus during
718 * their reset sequence even when they are non-selected slave
719 * devices, thus preventing discovery of the main HD
721 * Doing this wait-for-busy should not harm any existing configuration
722 * (at least things won't be worse than what current code does, that
723 * is blindly go & talk to the drive) and fix some issues like the
728 if (wait_hwif_ready(hwif))
729 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
732 * Second drive should only exist if first drive was found,
733 * but a lot of cdrom drives are configured as single slaves.
735 for (unit = 0; unit < MAX_DRIVES; ++unit) {
736 ide_drive_t *drive = &hwif->drives[unit];
737 drive->dn = (hwif->channel ? 2 : 0) + unit;
738 (void) probe_for_drive(drive);
739 if (drive->present && hwif->present && unit == 1) {
740 if (strcmp(hwif->drives[0].id->model, drive->id->model) == 0 &&
741 /* Don't do this for noprobe or non ATA */
742 strcmp(drive->id->model, "UNKNOWN") &&
743 /* And beware of confused Maxtor drives that go "M0000000000"
744 "The SN# is garbage in the ID block..." [Eric] */
745 strncmp(drive->id->serial_no, "M0000000000000000000", 20) &&
746 strncmp(hwif->drives[0].id->serial_no, drive->id->serial_no, 20) == 0) {
747 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
751 if (drive->present && !hwif->present) {
753 if (hwif->chipset != ide_4drives ||
755 !hwif->mate->present) {
760 if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
761 unsigned long timeout = jiffies + WAIT_WORSTCASE;
764 printk(KERN_WARNING "%s: reset\n", hwif->name);
765 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
767 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
770 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
771 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
774 local_irq_restore(flags);
776 * Use cached IRQ number. It might be (and is...) changed by probe
782 if (!hwif->present) {
783 ide_hwif_release_regions(hwif);
787 for (unit = 0; unit < MAX_DRIVES; ++unit) {
788 ide_drive_t *drive = &hwif->drives[unit];
790 if (drive->present) {
791 if (hwif->tuneproc != NULL &&
792 drive->autotune == IDE_TUNE_AUTO)
793 /* auto-tune PIO mode */
794 hwif->tuneproc(drive, 255);
796 * MAJOR HACK BARF :-/
798 * FIXME: chipsets own this cruft!
801 * Move here to prevent module loading clashing.
803 // drive->autodma = hwif->autodma;
804 if ((hwif->ide_dma_check) &&
805 ((drive->autotune == IDE_TUNE_DEFAULT) ||
806 (drive->autotune == IDE_TUNE_AUTO))) {
808 * Force DMAing for the beginning of the check.
809 * Some chipsets appear to do interesting
810 * things, if not checked and cleared.
813 hwif->ide_dma_off_quietly(drive);
814 #ifdef CONFIG_IDEDMA_ONLYDISK
815 if (drive->media == ide_disk)
817 hwif->ide_dma_check(drive);
823 static int hwif_init(ide_hwif_t *hwif);
824 int probe_hwif_init (ide_hwif_t *hwif)
831 for (unit = 0; unit < MAX_DRIVES; ++unit) {
832 ide_drive_t *drive = &hwif->drives[unit];
833 /* For now don't attach absent drives, we may
834 want them on default or a new "empty" class
835 for hotplug reprobing ? */
836 if (drive->present) {
844 EXPORT_SYMBOL(probe_hwif_init);
848 * save_match() is used to simplify logic in init_irq() below.
850 * A loophole here is that we may not know about a particular
851 * hwif's irq until after that hwif is actually probed/initialized..
852 * This could be a problem for the case where an hwif is on a
853 * dual interface that requires serialization (eg. cmd640) and another
854 * hwif using one of the same irqs is initialized beforehand.
856 * This routine detects and reports such situations, but does not fix them.
858 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
860 ide_hwif_t *m = *match;
862 if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
865 printk("%s: potential irq problem with %s and %s\n",
866 hwif->name, new->name, m->name);
868 if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
871 #endif /* MAX_HWIFS > 1 */
876 static int ide_init_queue(ide_drive_t *drive)
879 ide_hwif_t *hwif = HWIF(drive);
880 int max_sectors = 256;
881 int max_sg_entries = PRD_ENTRIES;
884 * Our default set up assumes the normal IDE case,
885 * that is 64K segmenting, standard PRD setup
886 * and LBA28. Some drivers then impose their own
887 * limits and LBA48 we could raise it but as yet
891 q = blk_init_queue(do_ide_request, &ide_lock);
895 q->queuedata = drive;
896 blk_queue_segment_boundary(q, 0xffff);
899 if (hwif->no_lba48 || hwif->no_lba48_dma)
902 hwif->rqsize = 65536;
904 if (hwif->rqsize < max_sectors)
905 max_sectors = hwif->rqsize;
906 blk_queue_max_sectors(q, max_sectors);
909 /* When we have an IOMMU, we may have a problem where pci_map_sg()
910 * creates segments that don't completely match our boundary
911 * requirements and thus need to be broken up again. Because it
912 * doesn't align properly either, we may actually have to break up
913 * to more segments than what was we got in the first place, a max
914 * worst case is twice as many.
915 * This will be fixed once we teach pci_map_sg() about our boundary
916 * requirements, hopefully soon. *FIXME*
918 if (!PCI_DMA_BUS_IS_PHYS)
919 max_sg_entries >>= 1;
920 #endif /* CONFIG_PCI */
922 blk_queue_max_hw_segments(q, max_sg_entries);
923 blk_queue_max_phys_segments(q, max_sg_entries);
925 /* assign drive and gendisk queue */
928 drive->disk->queue = drive->queue;
930 /* needs drive->queue to be set */
931 ide_toggle_bounce(drive, 1);
933 /* enable led activity for disk drives only */
934 if (drive->media == ide_disk && hwif->led_act)
935 blk_queue_activity_fn(q, hwif->led_act, drive);
941 * This routine sets up the irq for an ide interface, and creates a new
942 * hwgroup for the irq/hwif if none was previously assigned.
944 * Much of the code is for correctly detecting/handling irq sharing
945 * and irq serialization situations. This is somewhat complex because
946 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
948 * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
949 * interrupts completely disabled. This can be bad for interrupt latency,
950 * but anything else has led to problems on some machines. We re-enable
951 * interrupts as much as we can safely do in most places.
953 static int init_irq (ide_hwif_t *hwif)
956 ide_hwgroup_t *hwgroup;
957 ide_hwif_t *match = NULL;
960 BUG_ON(in_interrupt());
961 BUG_ON(irqs_disabled());
963 hwif->hwgroup = NULL;
966 * Group up with any other hwifs that share our irq(s).
968 for (index = 0; index < MAX_HWIFS; index++) {
969 ide_hwif_t *h = &ide_hwifs[index];
970 if (h->hwgroup) { /* scan only initialized hwif's */
971 if (hwif->irq == h->irq) {
972 hwif->sharing_irq = h->sharing_irq = 1;
973 if (hwif->chipset != ide_pci ||
974 h->chipset != ide_pci) {
975 save_match(hwif, h, &match);
978 if (hwif->serialized) {
979 if (hwif->mate && hwif->mate->irq == h->irq)
980 save_match(hwif, h, &match);
983 if (h->mate && hwif->irq == h->mate->irq)
984 save_match(hwif, h, &match);
988 #endif /* MAX_HWIFS > 1 */
990 * If we are still without a hwgroup, then form a new one
993 hwgroup = match->hwgroup;
994 hwif->hwgroup = hwgroup;
996 * Link us into the hwgroup.
997 * This must be done early, do ensure that unexpected_intr
998 * can find the hwif and prevent irq storms.
999 * No drives are attached to the new hwif, choose_drive
1000 * can't do anything stupid (yet).
1001 * Add ourself as the 2nd entry to the hwgroup->hwif
1002 * linked list, the first entry is the hwif that owns
1003 * hwgroup->handler - do not change that.
1005 spin_lock_irq(&ide_lock);
1006 hwif->next = hwgroup->hwif->next;
1007 hwgroup->hwif->next = hwif;
1008 spin_unlock_irq(&ide_lock);
1010 hwgroup = kmalloc(sizeof(ide_hwgroup_t),GFP_KERNEL);
1014 hwif->hwgroup = hwgroup;
1016 memset(hwgroup, 0, sizeof(ide_hwgroup_t));
1017 hwgroup->hwif = hwif->next = hwif;
1019 hwgroup->handler = NULL;
1020 hwgroup->drive = NULL;
1022 init_timer(&hwgroup->timer);
1023 hwgroup->timer.function = &ide_timer_expiry;
1024 hwgroup->timer.data = (unsigned long) hwgroup;
1028 * Allocate the irq, if not already obtained for another hwif
1030 if (!match || match->irq != hwif->irq) {
1031 int sa = SA_INTERRUPT;
1032 #if defined(__mc68000__) || defined(CONFIG_APUS)
1034 #endif /* __mc68000__ || CONFIG_APUS */
1036 if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
1038 #ifndef CONFIG_IDEPCI_SHARE_IRQ
1040 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
1043 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1045 hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1047 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1052 * For any present drive:
1053 * - allocate the block device queue
1054 * - link drive into the hwgroup
1056 for (index = 0; index < MAX_DRIVES; ++index) {
1057 ide_drive_t *drive = &hwif->drives[index];
1058 if (!drive->present)
1060 if (ide_init_queue(drive)) {
1061 printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1064 spin_lock_irq(&ide_lock);
1065 if (!hwgroup->drive) {
1066 /* first drive for hwgroup. */
1067 drive->next = drive;
1068 hwgroup->drive = drive;
1069 hwgroup->hwif = HWIF(hwgroup->drive);
1071 drive->next = hwgroup->drive->next;
1072 hwgroup->drive->next = drive;
1074 spin_unlock_irq(&ide_lock);
1077 #if !defined(__mc68000__) && !defined(CONFIG_APUS) && !defined(__sparc__)
1078 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1079 hwif->io_ports[IDE_DATA_OFFSET],
1080 hwif->io_ports[IDE_DATA_OFFSET]+7,
1081 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1082 #elif defined(__sparc__)
1083 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %s", hwif->name,
1084 hwif->io_ports[IDE_DATA_OFFSET],
1085 hwif->io_ports[IDE_DATA_OFFSET]+7,
1086 hwif->io_ports[IDE_CONTROL_OFFSET], __irq_itoa(hwif->irq));
1088 printk("%s at 0x%08lx on irq %d", hwif->name,
1089 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1090 #endif /* __mc68000__ && CONFIG_APUS */
1092 printk(" (%sed with %s)",
1093 hwif->sharing_irq ? "shar" : "serializ", match->name);
1098 spin_lock_irq(&ide_lock);
1099 if (hwif->next == hwif) {
1101 BUG_ON(hwgroup->hwif != hwif);
1106 while (g->next != hwif)
1108 g->next = hwif->next;
1109 if (hwgroup->hwif == hwif) {
1111 printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1114 BUG_ON(hwgroup->hwif == hwif);
1116 spin_unlock_irq(&ide_lock);
1122 static int ata_lock(dev_t dev, void *data)
1124 /* FIXME: we want to pin hwif down */
1128 extern ide_driver_t idedefault_driver;
1130 struct kobject *ata_probe(dev_t dev, int *part, void *data)
1132 ide_hwif_t *hwif = data;
1133 int unit = *part >> PARTN_BITS;
1134 ide_drive_t *drive = &hwif->drives[unit];
1135 if (!drive->present)
1137 if (drive->driver == &idedefault_driver) {
1138 if (drive->media == ide_disk)
1139 (void) request_module("ide-disk");
1141 (void) request_module("ide-scsi");
1142 if (drive->media == ide_cdrom || drive->media == ide_optical)
1143 (void) request_module("ide-cd");
1144 if (drive->media == ide_tape)
1145 (void) request_module("ide-tape");
1146 if (drive->media == ide_floppy)
1147 (void) request_module("ide-floppy");
1149 if (drive->driver == &idedefault_driver)
1151 *part &= (1 << PARTN_BITS) - 1;
1152 return get_disk(drive->disk);
1155 static int alloc_disks(ide_hwif_t *hwif)
1158 struct gendisk *disks[MAX_DRIVES];
1160 for (unit = 0; unit < MAX_DRIVES; unit++) {
1161 disks[unit] = alloc_disk(1 << PARTN_BITS);
1165 for (unit = 0; unit < MAX_DRIVES; ++unit) {
1166 ide_drive_t *drive = &hwif->drives[unit];
1167 struct gendisk *disk = disks[unit];
1168 disk->major = hwif->major;
1169 disk->first_minor = unit << PARTN_BITS;
1170 sprintf(disk->disk_name,"hd%c",'a'+hwif->index*MAX_DRIVES+unit);
1171 disk->fops = ide_fops;
1172 disk->private_data = drive;
1177 printk(KERN_WARNING "(ide::init_gendisk) Out of memory\n");
1179 put_disk(disks[unit]);
1183 static void drive_release_dev (struct device *dev)
1185 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1187 up(&drive->gendev_rel_sem);
1191 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1192 * after probing for drives, to allocate partition tables and other data
1193 * structures needed for the routines in genhd.c. ide_geninit() gets called
1194 * somewhat later, during the partition check.
1196 static void init_gendisk (ide_hwif_t *hwif)
1200 for (unit = 0; unit < MAX_DRIVES; ++unit) {
1201 ide_drive_t * drive = &hwif->drives[unit];
1202 ide_add_generic_settings(drive);
1203 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1205 drive->gendev.parent = &hwif->gendev;
1206 drive->gendev.bus = &ide_bus_type;
1207 drive->gendev.driver_data = drive;
1208 drive->gendev.release = drive_release_dev;
1209 if (drive->present) {
1210 device_register(&drive->gendev);
1211 sprintf(drive->devfs_name, "ide/host%d/bus%d/target%d/lun%d",
1212 (hwif->channel && hwif->mate) ?
1213 hwif->mate->index : hwif->index,
1214 hwif->channel, unit, drive->lun);
1217 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1218 THIS_MODULE, ata_probe, ata_lock, hwif);
1221 static int hwif_init(ide_hwif_t *hwif)
1229 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1231 printk("%s: DISABLED, NO IRQ\n", hwif->name);
1232 return (hwif->present = 0);
1235 #ifdef CONFIG_BLK_DEV_HD
1236 if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1237 printk("%s: CANNOT SHARE IRQ WITH OLD "
1238 "HARDDISK DRIVER (hd.c)\n", hwif->name);
1239 return (hwif->present = 0);
1241 #endif /* CONFIG_BLK_DEV_HD */
1243 /* we set it back to 1 if all is ok below */
1246 if (register_blkdev(hwif->major, hwif->name))
1249 if (alloc_disks(hwif) < 0)
1252 if (init_irq(hwif) == 0)
1255 old_irq = hwif->irq;
1257 * It failed to initialise. Find the default IRQ for
1258 * this port and try that.
1260 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1261 printk("%s: Disabled unable to get IRQ %d.\n",
1262 hwif->name, old_irq);
1265 if (init_irq(hwif)) {
1266 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1267 hwif->name, old_irq, hwif->irq);
1270 printk("%s: probed IRQ %d failed, using default.\n",
1271 hwif->name, hwif->irq);
1275 hwif->present = 1; /* success */
1279 for (unit = 0; unit < MAX_DRIVES; unit++) {
1280 struct gendisk *disk = hwif->drives[unit].disk;
1281 hwif->drives[unit].disk = NULL;
1285 unregister_blkdev(hwif->major, hwif->name);
1289 int ideprobe_init (void)
1292 int probe[MAX_HWIFS];
1294 memset(probe, 0, MAX_HWIFS * sizeof(int));
1295 for (index = 0; index < MAX_HWIFS; ++index)
1296 probe[index] = !ide_hwifs[index].present;
1299 * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
1301 for (index = 0; index < MAX_HWIFS; ++index)
1303 probe_hwif(&ide_hwifs[index]);
1304 for (index = 0; index < MAX_HWIFS; ++index)
1306 hwif_init(&ide_hwifs[index]);
1307 for (index = 0; index < MAX_HWIFS; ++index) {
1309 ide_hwif_t *hwif = &ide_hwifs[index];
1313 if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1314 hwif->chipset = ide_generic;
1315 for (unit = 0; unit < MAX_DRIVES; ++unit)
1316 if (hwif->drives[unit].present)
1317 ata_attach(&hwif->drives[unit]);
1323 EXPORT_SYMBOL_GPL(ideprobe_init);