2 * Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
3 * Copyright (C) 2005, 2007 Bartlomiej Zolnierkiewicz
7 * Mostly written by Mark Lord <mlord@pobox.com>
8 * and Gadi Oxman <gadio@netvision.net.il>
9 * and Andre Hedrick <andre@linux-ide.org>
11 * See linux/MAINTAINERS for address of current maintainer.
13 * This is the IDE probe module, as evolved from hd.c and ide.c.
15 * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
19 #include <linux/module.h>
20 #include <linux/types.h>
21 #include <linux/string.h>
22 #include <linux/kernel.h>
23 #include <linux/timer.h>
25 #include <linux/interrupt.h>
26 #include <linux/major.h>
27 #include <linux/errno.h>
28 #include <linux/genhd.h>
29 #include <linux/slab.h>
30 #include <linux/delay.h>
31 #include <linux/ide.h>
32 #include <linux/spinlock.h>
33 #include <linux/kmod.h>
34 #include <linux/pci.h>
35 #include <linux/scatterlist.h>
37 #include <asm/byteorder.h>
39 #include <asm/uaccess.h>
43 * generic_id - add a generic drive id
44 * @drive: drive to make an ID block for
46 * Add a fake id field to the drive we are passed. This allows
47 * use to skip a ton of NULL checks (which people always miss)
48 * and make drive properties unconditional outside of this file
51 static void generic_id(ide_drive_t *drive)
53 drive->id->cyls = drive->cyl;
54 drive->id->heads = drive->head;
55 drive->id->sectors = drive->sect;
56 drive->id->cur_cyls = drive->cyl;
57 drive->id->cur_heads = drive->head;
58 drive->id->cur_sectors = drive->sect;
61 static void ide_disk_init_chs(ide_drive_t *drive)
63 struct hd_driveid *id = drive->id;
65 /* Extract geometry if we did not already have one for the drive */
66 if (!drive->cyl || !drive->head || !drive->sect) {
67 drive->cyl = drive->bios_cyl = id->cyls;
68 drive->head = drive->bios_head = id->heads;
69 drive->sect = drive->bios_sect = id->sectors;
72 /* Handle logical geometry translation by the drive */
73 if ((id->field_valid & 1) && id->cur_cyls &&
74 id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
75 drive->cyl = id->cur_cyls;
76 drive->head = id->cur_heads;
77 drive->sect = id->cur_sectors;
80 /* Use physical geometry if what we have still makes no sense */
81 if (drive->head > 16 && id->heads && id->heads <= 16) {
82 drive->cyl = id->cyls;
83 drive->head = id->heads;
84 drive->sect = id->sectors;
88 static void ide_disk_init_mult_count(ide_drive_t *drive)
90 struct hd_driveid *id = drive->id;
92 drive->mult_count = 0;
93 if (id->max_multsect) {
94 #ifdef CONFIG_IDEDISK_MULTI_MODE
95 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
96 id->multsect_valid = id->multsect ? 1 : 0;
97 drive->mult_req = id->multsect_valid ? id->max_multsect : 0;
98 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
99 #else /* original, pre IDE-NFG, per request of AC */
101 if (drive->mult_req > id->max_multsect)
102 drive->mult_req = id->max_multsect;
103 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
104 drive->special.b.set_multmode = 1;
110 * do_identify - identify a drive
111 * @drive: drive to identify
114 * Called when we have issued a drive identify command to
115 * read and parse the results. This function is run with
116 * interrupts disabled.
119 static inline void do_identify (ide_drive_t *drive, u8 cmd)
121 ide_hwif_t *hwif = HWIF(drive);
123 struct hd_driveid *id;
126 /* read 512 bytes of id info */
127 hwif->ata_input_data(drive, id, SECTOR_WORDS);
132 printk(KERN_INFO "%s: dumping identify data\n", drive->name);
133 ide_dump_identify((u8 *)id);
137 #if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
139 * EATA SCSI controllers do a hardware ATA emulation:
140 * Ignore them if there is a driver for them available.
142 if ((id->model[0] == 'P' && id->model[1] == 'M') ||
143 (id->model[0] == 'S' && id->model[1] == 'K')) {
144 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
147 #endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
150 * WIN_IDENTIFY returns little-endian info,
151 * WIN_PIDENTIFY *usually* returns little-endian info.
153 if (cmd == WIN_PIDENTIFY) {
154 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
155 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
156 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
157 /* Vertos drives may still be weird */
160 ide_fixstring(id->model, sizeof(id->model), bswap);
161 ide_fixstring(id->fw_rev, sizeof(id->fw_rev), bswap);
162 ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
164 /* we depend on this a lot! */
165 id->model[sizeof(id->model)-1] = '\0';
167 if (strstr(id->model, "E X A B Y T E N E S T"))
170 printk("%s: %s, ", drive->name, id->model);
175 * Check for an ATAPI device
177 if (cmd == WIN_PIDENTIFY) {
178 u8 type = (id->config >> 8) & 0x1f;
182 if (!strstr(id->model, "CD-ROM")) {
183 if (!strstr(id->model, "oppy") &&
184 !strstr(id->model, "poyp") &&
185 !strstr(id->model, "ZIP"))
186 printk("cdrom or floppy?, assuming ");
187 if (drive->media != ide_cdrom) {
189 drive->removable = 1;
193 /* Early cdrom models used zero */
196 drive->removable = 1;
198 /* kludge for Apple PowerBook internal zip */
199 if (!strstr(id->model, "CD-ROM") &&
200 strstr(id->model, "ZIP")) {
206 printk ("CD/DVD-ROM");
213 drive->removable = 1;
216 printk("UNKNOWN (type %d)", type);
221 /* an ATAPI device ignores DRDY */
222 drive->ready_stat = 0;
227 * Not an ATAPI device: looks like a "regular" hard disk
231 * 0x848a = CompactFlash device
232 * These are *not* removable in Linux definition of the term
235 if ((id->config != 0x848a) && (id->config & (1<<7)))
236 drive->removable = 1;
238 drive->media = ide_disk;
239 printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
250 * actual_try_to_identify - send ata/atapi identify
251 * @drive: drive to identify
252 * @cmd: command to use
254 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
255 * and waits for a response. It also monitors irqs while this is
256 * happening, in hope of automatically determining which one is
257 * being used by the interface.
259 * Returns: 0 device was identified
260 * 1 device timed-out (no response to identify request)
261 * 2 device aborted the command (refused to identify itself)
264 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
266 ide_hwif_t *hwif = HWIF(drive);
268 unsigned long hd_status;
269 unsigned long timeout;
272 /* take a deep breath */
275 if (IDE_CONTROL_REG) {
276 a = hwif->INB(IDE_ALTSTATUS_REG);
277 s = hwif->INB(IDE_STATUS_REG);
278 if ((a ^ s) & ~INDEX_STAT) {
279 printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
280 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
281 /* ancient Seagate drives, broken interfaces */
282 hd_status = IDE_STATUS_REG;
284 /* use non-intrusive polling */
285 hd_status = IDE_ALTSTATUS_REG;
288 hd_status = IDE_STATUS_REG;
290 /* set features register for atapi
291 * identify command to be sure of reply
293 if ((cmd == WIN_PIDENTIFY))
294 /* disable dma & overlap */
295 hwif->OUTB(0, IDE_FEATURE_REG);
297 /* ask drive for ID */
298 hwif->OUTB(cmd, IDE_COMMAND_REG);
300 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
303 if (time_after(jiffies, timeout)) {
304 /* drive timed-out */
307 /* give drive a breather */
309 } while ((hwif->INB(hd_status)) & BUSY_STAT);
311 /* wait for IRQ and DRQ_STAT */
313 if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
316 /* local CPU only; some systems need this */
317 local_irq_save(flags);
318 /* drive returned ID */
319 do_identify(drive, cmd);
320 /* drive responded with ID */
322 /* clear drive IRQ */
323 (void) hwif->INB(IDE_STATUS_REG);
324 local_irq_restore(flags);
326 /* drive refused ID */
333 * try_to_identify - try to identify a drive
334 * @drive: drive to probe
335 * @cmd: command to use
337 * Issue the identify command and then do IRQ probing to
338 * complete the identification when needed by finding the
339 * IRQ the drive is attached to
342 static int try_to_identify (ide_drive_t *drive, u8 cmd)
344 ide_hwif_t *hwif = HWIF(drive);
347 unsigned long cookie = 0;
350 * Disable device irq unless we need to
351 * probe for it. Otherwise we'll get spurious
352 * interrupts during the identify-phase that
353 * the irq handler isn't expecting.
355 if (IDE_CONTROL_REG) {
358 cookie = probe_irq_on();
360 ide_set_irq(drive, autoprobe);
363 retval = actual_try_to_identify(drive, cmd);
368 ide_set_irq(drive, 0);
369 /* clear drive IRQ */
370 (void) hwif->INB(IDE_STATUS_REG);
372 irq = probe_irq_off(cookie);
377 /* Mmmm.. multiple IRQs..
378 * don't know which was ours
380 printk("%s: IRQ probe failed (0x%lx)\n",
381 drive->name, cookie);
388 static int ide_busy_sleep(ide_hwif_t *hwif)
390 unsigned long timeout = jiffies + WAIT_WORSTCASE;
395 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
396 if ((stat & BUSY_STAT) == 0)
398 } while (time_before(jiffies, timeout));
404 * do_probe - probe an IDE device
405 * @drive: drive to probe
406 * @cmd: command to use
408 * do_probe() has the difficult job of finding a drive if it exists,
409 * without getting hung up if it doesn't exist, without trampling on
410 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
412 * If a drive is "known" to exist (from CMOS or kernel parameters),
413 * but does not respond right away, the probe will "hang in there"
414 * for the maximum wait time (about 30 seconds), otherwise it will
415 * exit much more quickly.
417 * Returns: 0 device was identified
418 * 1 device timed-out (no response to identify request)
419 * 2 device aborted the command (refused to identify itself)
420 * 3 bad status from device (possible for ATAPI drives)
421 * 4 probe was not attempted because failure was obvious
424 static int do_probe (ide_drive_t *drive, u8 cmd)
427 ide_hwif_t *hwif = HWIF(drive);
429 if (drive->present) {
430 /* avoid waiting for inappropriate probes */
431 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
435 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
436 drive->name, drive->present, drive->media,
437 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
440 /* needed for some systems
441 * (e.g. crw9624 as drive0 with disk as slave)
446 if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
447 if (drive->select.b.unit != 0) {
448 /* exit with drive0 selected */
449 SELECT_DRIVE(&hwif->drives[0]);
450 /* allow BUSY_STAT to assert & clear */
453 /* no i/f present: mmm.. this should be a 4 -ml */
457 if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
458 drive->present || cmd == WIN_PIDENTIFY) {
459 /* send cmd and wait */
460 if ((rc = try_to_identify(drive, cmd))) {
461 /* failed: try again */
462 rc = try_to_identify(drive,cmd);
464 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
467 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
468 ((drive->autotune == IDE_TUNE_DEFAULT) ||
469 (drive->autotune == IDE_TUNE_AUTO))) {
470 printk("%s: no response (status = 0x%02x), "
471 "resetting drive\n", drive->name,
472 hwif->INB(IDE_STATUS_REG));
474 hwif->OUTB(drive->select.all, IDE_SELECT_REG);
476 hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
477 (void)ide_busy_sleep(hwif);
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);
506 printk("%s: enabling %s -- ", hwif->name, drive->id->model);
509 hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
511 if (ide_busy_sleep(hwif)) {
512 printk(KERN_CONT "failed (timeout)\n");
518 if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
519 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
524 /* if !(success||timed-out) */
525 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
526 /* look for ATAPI device */
527 (void) do_probe(drive, WIN_PIDENTIFY);
532 * probe_for_drives - upper level drive probe
533 * @drive: drive to probe for
535 * probe_for_drive() tests for existence of a given drive using do_probe()
536 * and presents things to the user as needed.
538 * Returns: 0 no device was found
539 * 1 device was found (note: drive->present might
543 static inline u8 probe_for_drive (ide_drive_t *drive)
546 * In order to keep things simple we have an id
547 * block for all drives at all times. If the device
548 * is pre ATA or refuses ATA/ATAPI identify we
549 * will add faked data to this.
551 * Also note that 0 everywhere means "can't do X"
554 drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
556 if(drive->id == NULL)
558 printk(KERN_ERR "ide: out of memory for id data.\n");
561 strcpy(drive->id->model, "UNKNOWN");
566 /* if !(success||timed-out) */
567 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
568 /* look for ATAPI device */
569 (void) do_probe(drive, WIN_PIDENTIFY);
572 /* drive not found */
574 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
577 /* identification failed? */
578 if (!drive->id_read) {
579 if (drive->media == ide_disk) {
580 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
581 drive->name, drive->cyl,
582 drive->head, drive->sect);
583 } else if (drive->media == ide_cdrom) {
584 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
587 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
591 /* drive was found */
595 /* The drive wasn't being helpful. Add generic info only */
596 if (drive->id_read == 0) {
601 if (drive->media == ide_disk) {
602 ide_disk_init_chs(drive);
603 ide_disk_init_mult_count(drive);
606 return drive->present;
609 static void hwif_release_dev (struct device *dev)
611 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
613 complete(&hwif->gendev_rel_comp);
616 static void hwif_register (ide_hwif_t *hwif)
620 /* register with global device tree */
621 strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
622 hwif->gendev.driver_data = hwif;
623 if (hwif->gendev.parent == NULL) {
625 hwif->gendev.parent = hwif->dev;
627 /* Would like to do = &device_legacy */
628 hwif->gendev.parent = NULL;
630 hwif->gendev.release = hwif_release_dev;
631 ret = device_register(&hwif->gendev);
633 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
638 * ide_port_wait_ready - wait for port to become ready
641 * This is needed on some PPCs and a bunch of BIOS-less embedded
642 * platforms. Typical cases are:
644 * - The firmware hard reset the disk before booting the kernel,
645 * the drive is still doing it's poweron-reset sequence, that
646 * can take up to 30 seconds.
648 * - The firmware does nothing (or no firmware), the device is
649 * still in POST state (same as above actually).
651 * - Some CD/DVD/Writer combo drives tend to drive the bus during
652 * their reset sequence even when they are non-selected slave
653 * devices, thus preventing discovery of the main HD.
655 * Doing this wait-for-non-busy should not harm any existing
656 * configuration and fix some issues like the above.
660 * Returns 0 on success, error code (< 0) otherwise.
663 static int ide_port_wait_ready(ide_hwif_t *hwif)
667 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
669 /* Let HW settle down a bit from whatever init state we
673 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
674 * I know of at least one disk who takes 31 seconds, I use 35
677 rc = ide_wait_not_busy(hwif, 35000);
681 /* Now make sure both master & slave are ready */
682 for (unit = 0; unit < MAX_DRIVES; unit++) {
683 ide_drive_t *drive = &hwif->drives[unit];
685 /* Ignore disks that we will not probe for later. */
686 if (!drive->noprobe || drive->present) {
688 ide_set_irq(drive, 1);
690 rc = ide_wait_not_busy(hwif, 35000);
694 printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
698 /* Exit function with master reselected (let's be sane) */
700 SELECT_DRIVE(&hwif->drives[0]);
706 * ide_undecoded_slave - look for bad CF adapters
709 * Analyse the drives on the interface and attempt to decide if we
710 * have the same drive viewed twice. This occurs with crap CF adapters
711 * and PCMCIA sometimes.
714 void ide_undecoded_slave(ide_drive_t *drive1)
716 ide_drive_t *drive0 = &drive1->hwif->drives[0];
718 if ((drive1->dn & 1) == 0 || drive0->present == 0)
721 /* If the models don't match they are not the same product */
722 if (strcmp(drive0->id->model, drive1->id->model))
725 /* Serial numbers do not match */
726 if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
729 /* No serial number, thankfully very rare for CF */
730 if (drive0->id->serial_no[0] == 0)
733 /* Appears to be an IDE flash adapter with decode bugs */
734 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
739 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
742 * This routine only knows how to look for drive units 0 and 1
743 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
745 static void probe_hwif(ide_hwif_t *hwif)
754 if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
755 (ide_hwif_request_regions(hwif))) {
756 printk(KERN_ERR "%s: ports already in use, skipping probe\n",
762 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
763 * we'll install our IRQ driver much later...
767 disable_irq(hwif->irq);
769 local_irq_set(flags);
771 if (ide_port_wait_ready(hwif) == -EBUSY)
772 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
775 * Need to probe slave device first to make it release PDIAG-.
777 for (unit = MAX_DRIVES - 1; unit >= 0; unit--) {
778 ide_drive_t *drive = &hwif->drives[unit];
779 drive->dn = (hwif->channel ? 2 : 0) + unit;
780 (void) probe_for_drive(drive);
781 if (drive->present && !hwif->present) {
783 if (hwif->chipset != ide_4drives ||
785 !hwif->mate->present) {
790 if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
791 printk(KERN_WARNING "%s: reset\n", hwif->name);
792 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
794 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
795 (void)ide_busy_sleep(hwif);
797 local_irq_restore(flags);
799 * Use cached IRQ number. It might be (and is...) changed by probe
805 if (!hwif->present) {
806 ide_hwif_release_regions(hwif);
810 for (unit = 0; unit < MAX_DRIVES; unit++) {
811 ide_drive_t *drive = &hwif->drives[unit];
813 if (drive->present && hwif->quirkproc)
814 hwif->quirkproc(drive);
817 for (unit = 0; unit < MAX_DRIVES; ++unit) {
818 ide_drive_t *drive = &hwif->drives[unit];
820 if (drive->present) {
821 if (drive->autotune == IDE_TUNE_AUTO)
822 ide_set_max_pio(drive);
824 if (drive->autotune != IDE_TUNE_DEFAULT &&
825 drive->autotune != IDE_TUNE_AUTO)
830 if (hwif->dma_host_set)
835 for (unit = 0; unit < MAX_DRIVES; ++unit) {
836 ide_drive_t *drive = &hwif->drives[unit];
838 if (hwif->no_io_32bit)
839 drive->no_io_32bit = 1;
841 drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
847 * save_match() is used to simplify logic in init_irq() below.
849 * A loophole here is that we may not know about a particular
850 * hwif's irq until after that hwif is actually probed/initialized..
851 * This could be a problem for the case where an hwif is on a
852 * dual interface that requires serialization (eg. cmd640) and another
853 * hwif using one of the same irqs is initialized beforehand.
855 * This routine detects and reports such situations, but does not fix them.
857 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
859 ide_hwif_t *m = *match;
861 if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
864 printk("%s: potential irq problem with %s and %s\n",
865 hwif->name, new->name, m->name);
867 if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
870 #endif /* MAX_HWIFS > 1 */
875 static int ide_init_queue(ide_drive_t *drive)
877 struct request_queue *q;
878 ide_hwif_t *hwif = HWIF(drive);
879 int max_sectors = 256;
880 int max_sg_entries = PRD_ENTRIES;
883 * Our default set up assumes the normal IDE case,
884 * that is 64K segmenting, standard PRD setup
885 * and LBA28. Some drivers then impose their own
886 * limits and LBA48 we could raise it but as yet
890 q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
894 q->queuedata = drive;
895 blk_queue_segment_boundary(q, 0xffff);
898 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
899 (hwif->host_flags & IDE_HFLAG_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 queue */
928 /* needs drive->queue to be set */
929 ide_toggle_bounce(drive, 1);
935 * This routine sets up the irq for an ide interface, and creates a new
936 * hwgroup for the irq/hwif if none was previously assigned.
938 * Much of the code is for correctly detecting/handling irq sharing
939 * and irq serialization situations. This is somewhat complex because
940 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
942 static int init_irq (ide_hwif_t *hwif)
945 ide_hwgroup_t *hwgroup;
946 ide_hwif_t *match = NULL;
949 BUG_ON(in_interrupt());
950 BUG_ON(irqs_disabled());
951 BUG_ON(hwif == NULL);
953 mutex_lock(&ide_cfg_mtx);
954 hwif->hwgroup = NULL;
957 * Group up with any other hwifs that share our irq(s).
959 for (index = 0; index < MAX_HWIFS; index++) {
960 ide_hwif_t *h = &ide_hwifs[index];
961 if (h->hwgroup) { /* scan only initialized hwif's */
962 if (hwif->irq == h->irq) {
963 hwif->sharing_irq = h->sharing_irq = 1;
964 if (hwif->chipset != ide_pci ||
965 h->chipset != ide_pci) {
966 save_match(hwif, h, &match);
969 if (hwif->serialized) {
970 if (hwif->mate && hwif->mate->irq == h->irq)
971 save_match(hwif, h, &match);
974 if (h->mate && hwif->irq == h->mate->irq)
975 save_match(hwif, h, &match);
979 #endif /* MAX_HWIFS > 1 */
981 * If we are still without a hwgroup, then form a new one
984 hwgroup = match->hwgroup;
985 hwif->hwgroup = hwgroup;
987 * Link us into the hwgroup.
988 * This must be done early, do ensure that unexpected_intr
989 * can find the hwif and prevent irq storms.
990 * No drives are attached to the new hwif, choose_drive
991 * can't do anything stupid (yet).
992 * Add ourself as the 2nd entry to the hwgroup->hwif
993 * linked list, the first entry is the hwif that owns
994 * hwgroup->handler - do not change that.
996 spin_lock_irq(&ide_lock);
997 hwif->next = hwgroup->hwif->next;
998 hwgroup->hwif->next = hwif;
999 spin_unlock_irq(&ide_lock);
1001 hwgroup = kmalloc_node(sizeof(ide_hwgroup_t),
1002 GFP_KERNEL | __GFP_ZERO,
1003 hwif_to_node(hwif->drives[0].hwif));
1007 hwif->hwgroup = hwgroup;
1009 hwgroup->hwif = hwif->next = hwif;
1011 hwgroup->handler = NULL;
1012 hwgroup->drive = NULL;
1014 init_timer(&hwgroup->timer);
1015 hwgroup->timer.function = &ide_timer_expiry;
1016 hwgroup->timer.data = (unsigned long) hwgroup;
1020 * Allocate the irq, if not already obtained for another hwif
1022 if (!match || match->irq != hwif->irq) {
1024 #if defined(__mc68000__) || defined(CONFIG_APUS)
1026 #endif /* __mc68000__ || CONFIG_APUS */
1028 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1031 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1033 hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1035 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1040 * For any present drive:
1041 * - allocate the block device queue
1042 * - link drive into the hwgroup
1044 for (index = 0; index < MAX_DRIVES; ++index) {
1045 ide_drive_t *drive = &hwif->drives[index];
1046 if (!drive->present)
1048 if (ide_init_queue(drive)) {
1049 printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1052 spin_lock_irq(&ide_lock);
1053 if (!hwgroup->drive) {
1054 /* first drive for hwgroup. */
1055 drive->next = drive;
1056 hwgroup->drive = drive;
1057 hwgroup->hwif = HWIF(hwgroup->drive);
1059 drive->next = hwgroup->drive->next;
1060 hwgroup->drive->next = drive;
1062 spin_unlock_irq(&ide_lock);
1065 #if !defined(__mc68000__) && !defined(CONFIG_APUS)
1066 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1067 hwif->io_ports[IDE_DATA_OFFSET],
1068 hwif->io_ports[IDE_DATA_OFFSET]+7,
1069 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1071 printk("%s at 0x%08lx on irq %d", hwif->name,
1072 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1073 #endif /* __mc68000__ && CONFIG_APUS */
1075 printk(" (%sed with %s)",
1076 hwif->sharing_irq ? "shar" : "serializ", match->name);
1078 mutex_unlock(&ide_cfg_mtx);
1081 spin_lock_irq(&ide_lock);
1082 if (hwif->next == hwif) {
1084 BUG_ON(hwgroup->hwif != hwif);
1089 while (g->next != hwif)
1091 g->next = hwif->next;
1092 if (hwgroup->hwif == hwif) {
1094 printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1097 BUG_ON(hwgroup->hwif == hwif);
1099 spin_unlock_irq(&ide_lock);
1101 mutex_unlock(&ide_cfg_mtx);
1105 static int ata_lock(dev_t dev, void *data)
1107 /* FIXME: we want to pin hwif down */
1111 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1113 ide_hwif_t *hwif = data;
1114 int unit = *part >> PARTN_BITS;
1115 ide_drive_t *drive = &hwif->drives[unit];
1116 if (!drive->present)
1119 if (drive->media == ide_disk)
1120 request_module("ide-disk");
1122 request_module("ide-scsi");
1123 if (drive->media == ide_cdrom || drive->media == ide_optical)
1124 request_module("ide-cd");
1125 if (drive->media == ide_tape)
1126 request_module("ide-tape");
1127 if (drive->media == ide_floppy)
1128 request_module("ide-floppy");
1133 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1135 struct gendisk *p = data;
1136 *part &= (1 << PARTN_BITS) - 1;
1137 return &p->dev.kobj;
1140 static int exact_lock(dev_t dev, void *data)
1142 struct gendisk *p = data;
1149 void ide_register_region(struct gendisk *disk)
1151 blk_register_region(MKDEV(disk->major, disk->first_minor),
1152 disk->minors, NULL, exact_match, exact_lock, disk);
1155 EXPORT_SYMBOL_GPL(ide_register_region);
1157 void ide_unregister_region(struct gendisk *disk)
1159 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1163 EXPORT_SYMBOL_GPL(ide_unregister_region);
1165 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1167 ide_hwif_t *hwif = drive->hwif;
1168 unsigned int unit = (drive->select.all >> 4) & 1;
1170 disk->major = hwif->major;
1171 disk->first_minor = unit << PARTN_BITS;
1172 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1173 disk->queue = drive->queue;
1176 EXPORT_SYMBOL_GPL(ide_init_disk);
1178 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1180 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1182 if (drive == drive->next) {
1183 /* special case: last drive from hwgroup. */
1184 BUG_ON(hwgroup->drive != drive);
1185 hwgroup->drive = NULL;
1189 walk = hwgroup->drive;
1190 while (walk->next != drive)
1192 walk->next = drive->next;
1193 if (hwgroup->drive == drive) {
1194 hwgroup->drive = drive->next;
1195 hwgroup->hwif = hwgroup->drive->hwif;
1198 BUG_ON(hwgroup->drive == drive);
1201 static void drive_release_dev (struct device *dev)
1203 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1205 spin_lock_irq(&ide_lock);
1206 ide_remove_drive_from_hwgroup(drive);
1210 /* Messed up locking ... */
1211 spin_unlock_irq(&ide_lock);
1212 blk_cleanup_queue(drive->queue);
1213 spin_lock_irq(&ide_lock);
1214 drive->queue = NULL;
1215 spin_unlock_irq(&ide_lock);
1217 complete(&drive->gendev_rel_comp);
1221 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1222 * after probing for drives, to allocate partition tables and other data
1223 * structures needed for the routines in genhd.c. ide_geninit() gets called
1224 * somewhat later, during the partition check.
1226 static void init_gendisk (ide_hwif_t *hwif)
1230 for (unit = 0; unit < MAX_DRIVES; ++unit) {
1231 ide_drive_t * drive = &hwif->drives[unit];
1232 ide_add_generic_settings(drive);
1233 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1235 drive->gendev.parent = &hwif->gendev;
1236 drive->gendev.bus = &ide_bus_type;
1237 drive->gendev.driver_data = drive;
1238 drive->gendev.release = drive_release_dev;
1240 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1241 THIS_MODULE, ata_probe, ata_lock, hwif);
1244 static int hwif_init(ide_hwif_t *hwif)
1248 /* Return success if no device is connected */
1253 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1255 printk("%s: DISABLED, NO IRQ\n", hwif->name);
1256 return (hwif->present = 0);
1259 #ifdef CONFIG_BLK_DEV_HD
1260 if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1261 printk("%s: CANNOT SHARE IRQ WITH OLD "
1262 "HARDDISK DRIVER (hd.c)\n", hwif->name);
1263 return (hwif->present = 0);
1265 #endif /* CONFIG_BLK_DEV_HD */
1267 /* we set it back to 1 if all is ok below */
1270 if (register_blkdev(hwif->major, hwif->name))
1273 if (!hwif->sg_max_nents)
1274 hwif->sg_max_nents = PRD_ENTRIES;
1276 hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1278 if (!hwif->sg_table) {
1279 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1283 sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1285 if (init_irq(hwif) == 0)
1288 old_irq = hwif->irq;
1290 * It failed to initialise. Find the default IRQ for
1291 * this port and try that.
1293 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1294 printk("%s: Disabled unable to get IRQ %d.\n",
1295 hwif->name, old_irq);
1298 if (init_irq(hwif)) {
1299 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1300 hwif->name, old_irq, hwif->irq);
1303 printk("%s: probed IRQ %d failed, using default.\n",
1304 hwif->name, hwif->irq);
1309 ide_acpi_init(hwif);
1311 hwif->present = 1; /* success */
1315 unregister_blkdev(hwif->major, hwif->name);
1319 static void hwif_register_devices(ide_hwif_t *hwif)
1323 for (i = 0; i < MAX_DRIVES; i++) {
1324 ide_drive_t *drive = &hwif->drives[i];
1326 if (drive->present) {
1327 int ret = device_register(&drive->gendev);
1330 printk(KERN_WARNING "IDE: %s: "
1331 "device_register error: %d\n",
1337 int ide_device_add_all(u8 *idx)
1342 for (i = 0; i < MAX_HWIFS; i++) {
1346 probe_hwif(&ide_hwifs[idx[i]]);
1349 for (i = 0; i < MAX_HWIFS; i++) {
1353 hwif = &ide_hwifs[idx[i]];
1355 if (hwif_init(hwif) == 0) {
1356 printk(KERN_INFO "%s: failed to initialize IDE "
1357 "interface\n", hwif->name);
1363 for (i = 0; i < MAX_HWIFS; i++) {
1367 hwif = &ide_hwifs[idx[i]];
1369 if (hwif->present) {
1370 if (hwif->chipset == ide_unknown ||
1371 hwif->chipset == ide_forced)
1372 hwif->chipset = ide_generic;
1373 hwif_register_devices(hwif);
1377 for (i = 0; i < MAX_HWIFS; i++) {
1379 ide_proc_register_port(&ide_hwifs[idx[i]]);
1384 EXPORT_SYMBOL_GPL(ide_device_add_all);
1386 int ide_device_add(u8 idx[4])
1388 u8 idx_all[MAX_HWIFS];
1391 for (i = 0; i < MAX_HWIFS; i++)
1392 idx_all[i] = (i < 4) ? idx[i] : 0xff;
1394 return ide_device_add_all(idx_all);
1396 EXPORT_SYMBOL_GPL(ide_device_add);