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)
55 id[ATA_ID_CUR_CYLS] = id[ATA_ID_CYLS] = drive->cyl;
56 id[ATA_ID_CUR_HEADS] = id[ATA_ID_HEADS] = drive->head;
57 id[ATA_ID_CUR_SECTORS] = id[ATA_ID_SECTORS] = drive->sect;
60 static void ide_disk_init_chs(ide_drive_t *drive)
64 /* Extract geometry if we did not already have one for the drive */
65 if (!drive->cyl || !drive->head || !drive->sect) {
66 drive->cyl = drive->bios_cyl = id[ATA_ID_CYLS];
67 drive->head = drive->bios_head = id[ATA_ID_HEADS];
68 drive->sect = drive->bios_sect = id[ATA_ID_SECTORS];
71 /* Handle logical geometry translation by the drive */
72 if (ata_id_current_chs_valid(id)) {
73 drive->cyl = id[ATA_ID_CUR_CYLS];
74 drive->head = id[ATA_ID_CUR_HEADS];
75 drive->sect = id[ATA_ID_CUR_SECTORS];
78 /* Use physical geometry if what we have still makes no sense */
79 if (drive->head > 16 && id[ATA_ID_HEADS] && id[ATA_ID_HEADS] <= 16) {
80 drive->cyl = id[ATA_ID_CYLS];
81 drive->head = id[ATA_ID_HEADS];
82 drive->sect = id[ATA_ID_SECTORS];
86 static void ide_disk_init_mult_count(ide_drive_t *drive)
89 u8 max_multsect = id[ATA_ID_MAX_MULTSECT] & 0xff;
92 #ifdef CONFIG_IDEDISK_MULTI_MODE
93 if ((max_multsect / 2) > 1)
94 id[ATA_ID_MULTSECT] = max_multsect | 0x100;
96 id[ATA_ID_MULTSECT] &= ~0x1ff;
98 drive->mult_req = id[ATA_ID_MULTSECT] & 0xff;
100 if ((id[ATA_ID_MULTSECT] & 0x100) &&
101 (id[ATA_ID_MULTSECT] & 0xff))
102 drive->special.b.set_multmode = 1;
107 * do_identify - identify a drive
108 * @drive: drive to identify
111 * Called when we have issued a drive identify command to
112 * read and parse the results. This function is run with
113 * interrupts disabled.
116 static inline void do_identify (ide_drive_t *drive, u8 cmd)
118 ide_hwif_t *hwif = HWIF(drive);
120 char *m = (char *)&id[ATA_ID_PROD];
123 /* read 512 bytes of id info */
124 hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
129 printk(KERN_INFO "%s: dumping identify data\n", drive->name);
130 ide_dump_identify((u8 *)id);
135 * ATA_CMD_ID_ATA returns little-endian info,
136 * ATA_CMD_ID_ATAPI *usually* returns little-endian info.
138 if (cmd == ATA_CMD_ID_ATAPI) {
139 if ((m[0] == 'N' && m[1] == 'E') || /* NEC */
140 (m[0] == 'F' && m[1] == 'X') || /* Mitsumi */
141 (m[0] == 'P' && m[1] == 'i')) /* Pioneer */
142 /* Vertos drives may still be weird */
146 ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
147 ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
148 ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
150 /* we depend on this a lot! */
151 m[ATA_ID_PROD_LEN - 1] = '\0';
153 if (strstr(m, "E X A B Y T E N E S T"))
156 printk(KERN_INFO "%s: %s, ", drive->name, m);
162 * Check for an ATAPI device
164 if (cmd == ATA_CMD_ID_ATAPI) {
165 u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;
167 printk(KERN_CONT "ATAPI ");
170 if (!strstr(m, "CD-ROM")) {
171 if (!strstr(m, "oppy") &&
172 !strstr(m, "poyp") &&
174 printk(KERN_CONT "cdrom or floppy?, assuming ");
175 if (drive->media != ide_cdrom) {
176 printk(KERN_CONT "FLOPPY");
177 drive->removable = 1;
181 /* Early cdrom models used zero */
184 drive->removable = 1;
186 /* kludge for Apple PowerBook internal zip */
187 if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
188 printk(KERN_CONT "FLOPPY");
193 printk(KERN_CONT "CD/DVD-ROM");
196 printk(KERN_CONT "TAPE");
199 printk(KERN_CONT "OPTICAL");
200 drive->removable = 1;
203 printk(KERN_CONT "UNKNOWN (type %d)", type);
206 printk(KERN_CONT " drive\n");
208 /* an ATAPI device ignores DRDY */
209 drive->ready_stat = 0;
214 * Not an ATAPI device: looks like a "regular" hard disk
218 * 0x848a = CompactFlash device
219 * These are *not* removable in Linux definition of the term
221 if (id[ATA_ID_CONFIG] != 0x848a && (id[ATA_ID_CONFIG] & (1 << 7)))
222 drive->removable = 1;
224 drive->media = ide_disk;
226 printk(KERN_CONT "%s DISK drive\n",
227 (id[ATA_ID_CONFIG] == 0x848a) ? "CFA" : "ATA");
238 * actual_try_to_identify - send ata/atapi identify
239 * @drive: drive to identify
240 * @cmd: command to use
242 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
243 * and waits for a response. It also monitors irqs while this is
244 * happening, in hope of automatically determining which one is
245 * being used by the interface.
247 * Returns: 0 device was identified
248 * 1 device timed-out (no response to identify request)
249 * 2 device aborted the command (refused to identify itself)
252 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
254 ide_hwif_t *hwif = HWIF(drive);
255 struct ide_io_ports *io_ports = &hwif->io_ports;
256 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
257 int use_altstatus = 0, rc;
258 unsigned long timeout;
261 /* take a deep breath */
264 if (io_ports->ctl_addr) {
265 a = tp_ops->read_altstatus(hwif);
266 s = tp_ops->read_status(hwif);
267 if ((a ^ s) & ~ATA_IDX)
268 /* ancient Seagate drives, broken interfaces */
269 printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
270 "instead of ALTSTATUS(0x%02x)\n",
273 /* use non-intrusive polling */
277 /* set features register for atapi
278 * identify command to be sure of reply
280 if (cmd == ATA_CMD_ID_ATAPI) {
283 memset(&task, 0, sizeof(task));
284 /* disable DMA & overlap */
285 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
287 tp_ops->tf_load(drive, &task);
290 /* ask drive for ID */
291 tp_ops->exec_command(hwif, cmd);
293 timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
295 if (ide_busy_sleep(hwif, timeout, use_altstatus))
298 /* wait for IRQ and ATA_DRQ */
300 s = tp_ops->read_status(hwif);
302 if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
305 /* local CPU only; some systems need this */
306 local_irq_save(flags);
307 /* drive returned ID */
308 do_identify(drive, cmd);
309 /* drive responded with ID */
311 /* clear drive IRQ */
312 (void)tp_ops->read_status(hwif);
313 local_irq_restore(flags);
315 /* drive refused ID */
322 * try_to_identify - try to identify a drive
323 * @drive: drive to probe
324 * @cmd: command to use
326 * Issue the identify command and then do IRQ probing to
327 * complete the identification when needed by finding the
328 * IRQ the drive is attached to
331 static int try_to_identify (ide_drive_t *drive, u8 cmd)
333 ide_hwif_t *hwif = HWIF(drive);
334 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
337 unsigned long cookie = 0;
340 * Disable device irq unless we need to
341 * probe for it. Otherwise we'll get spurious
342 * interrupts during the identify-phase that
343 * the irq handler isn't expecting.
345 if (hwif->io_ports.ctl_addr) {
348 cookie = probe_irq_on();
350 tp_ops->set_irq(hwif, autoprobe);
353 retval = actual_try_to_identify(drive, cmd);
358 tp_ops->set_irq(hwif, 0);
359 /* clear drive IRQ */
360 (void)tp_ops->read_status(hwif);
362 irq = probe_irq_off(cookie);
367 /* Mmmm.. multiple IRQs..
368 * don't know which was ours
370 printk(KERN_ERR "%s: IRQ probe failed (0x%lx)\n",
371 drive->name, cookie);
378 int ide_busy_sleep(ide_hwif_t *hwif, unsigned long timeout, int altstatus)
385 msleep(50); /* give drive a breather */
386 stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
387 : hwif->tp_ops->read_status(hwif);
388 if ((stat & ATA_BUSY) == 0)
390 } while (time_before(jiffies, timeout));
392 return 1; /* drive timed-out */
395 static u8 ide_read_device(ide_drive_t *drive)
399 memset(&task, 0, sizeof(task));
400 task.tf_flags = IDE_TFLAG_IN_DEVICE;
402 drive->hwif->tp_ops->tf_read(drive, &task);
404 return task.tf.device;
408 * do_probe - probe an IDE device
409 * @drive: drive to probe
410 * @cmd: command to use
412 * do_probe() has the difficult job of finding a drive if it exists,
413 * without getting hung up if it doesn't exist, without trampling on
414 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
416 * If a drive is "known" to exist (from CMOS or kernel parameters),
417 * but does not respond right away, the probe will "hang in there"
418 * for the maximum wait time (about 30 seconds), otherwise it will
419 * exit much more quickly.
421 * Returns: 0 device was identified
422 * 1 device timed-out (no response to identify request)
423 * 2 device aborted the command (refused to identify itself)
424 * 3 bad status from device (possible for ATAPI drives)
425 * 4 probe was not attempted because failure was obvious
428 static int do_probe (ide_drive_t *drive, u8 cmd)
430 ide_hwif_t *hwif = HWIF(drive);
431 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
435 if (drive->present) {
436 /* avoid waiting for inappropriate probes */
437 if (drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
441 printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
442 drive->name, drive->present, drive->media,
443 (cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
446 /* needed for some systems
447 * (e.g. crw9624 as drive0 with disk as slave)
453 if (ide_read_device(drive) != drive->select.all && !drive->present) {
454 if (drive->select.b.unit != 0) {
455 /* exit with drive0 selected */
456 SELECT_DRIVE(&hwif->drives[0]);
457 /* allow ATA_BUSY to assert & clear */
460 /* no i/f present: mmm.. this should be a 4 -ml */
464 stat = tp_ops->read_status(hwif);
466 if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
467 drive->present || cmd == ATA_CMD_ID_ATAPI) {
468 /* send cmd and wait */
469 if ((rc = try_to_identify(drive, cmd))) {
470 /* failed: try again */
471 rc = try_to_identify(drive,cmd);
474 stat = tp_ops->read_status(hwif);
476 if (stat == (ATA_BUSY | ATA_DRDY))
479 if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
480 printk(KERN_ERR "%s: no response (status = 0x%02x), "
481 "resetting drive\n", drive->name, stat);
485 tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
486 (void)ide_busy_sleep(hwif, WAIT_WORSTCASE, 0);
487 rc = try_to_identify(drive, cmd);
490 /* ensure drive IRQ is clear */
491 stat = tp_ops->read_status(hwif);
494 printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
497 /* not present or maybe ATAPI */
500 if (drive->select.b.unit != 0) {
501 /* exit with drive0 selected */
502 SELECT_DRIVE(&hwif->drives[0]);
504 /* ensure drive irq is clear */
505 (void)tp_ops->read_status(hwif);
513 static void enable_nest (ide_drive_t *drive)
515 ide_hwif_t *hwif = HWIF(drive);
516 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
519 printk(KERN_INFO "%s: enabling %s -- ",
520 hwif->name, (char *)&drive->id[ATA_ID_PROD]);
524 tp_ops->exec_command(hwif, ATA_EXABYTE_ENABLE_NEST);
526 if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 0)) {
527 printk(KERN_CONT "failed (timeout)\n");
533 stat = tp_ops->read_status(hwif);
535 if (!OK_STAT(stat, 0, BAD_STAT))
536 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
538 printk(KERN_CONT "success\n");
542 * probe_for_drives - upper level drive probe
543 * @drive: drive to probe for
545 * probe_for_drive() tests for existence of a given drive using do_probe()
546 * and presents things to the user as needed.
548 * Returns: 0 no device was found
549 * 1 device was found (note: drive->present might
553 static inline u8 probe_for_drive (ide_drive_t *drive)
558 * In order to keep things simple we have an id
559 * block for all drives at all times. If the device
560 * is pre ATA or refuses ATA/ATAPI identify we
561 * will add faked data to this.
563 * Also note that 0 everywhere means "can't do X"
566 drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
568 if(drive->id == NULL)
570 printk(KERN_ERR "ide: out of memory for id data.\n");
574 m = (char *)&drive->id[ATA_ID_PROD];
575 strcpy(m, "UNKNOWN");
578 if (!drive->noprobe) {
580 /* if !(success||timed-out) */
581 if (do_probe(drive, ATA_CMD_ID_ATA) >= 2)
582 /* look for ATAPI device */
583 (void)do_probe(drive, ATA_CMD_ID_ATAPI);
586 /* drive not found */
589 if (strstr(m, "E X A B Y T E N E S T")) {
594 /* identification failed? */
595 if (!drive->id_read) {
596 if (drive->media == ide_disk) {
597 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
598 drive->name, drive->cyl,
599 drive->head, drive->sect);
600 } else if (drive->media == ide_cdrom) {
601 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
604 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
608 /* drive was found */
612 /* The drive wasn't being helpful. Add generic info only */
613 if (drive->id_read == 0) {
618 if (drive->media == ide_disk) {
619 ide_disk_init_chs(drive);
620 ide_disk_init_mult_count(drive);
623 return drive->present;
626 static void hwif_release_dev(struct device *dev)
628 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
630 complete(&hwif->gendev_rel_comp);
633 static int ide_register_port(ide_hwif_t *hwif)
637 /* register with global device tree */
638 strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
639 hwif->gendev.driver_data = hwif;
640 if (hwif->gendev.parent == NULL) {
642 hwif->gendev.parent = hwif->dev;
644 /* Would like to do = &device_legacy */
645 hwif->gendev.parent = NULL;
647 hwif->gendev.release = hwif_release_dev;
648 ret = device_register(&hwif->gendev);
650 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
655 hwif->portdev = device_create_drvdata(ide_port_class, &hwif->gendev,
656 MKDEV(0, 0), hwif, hwif->name);
657 if (IS_ERR(hwif->portdev)) {
658 ret = PTR_ERR(hwif->portdev);
659 device_unregister(&hwif->gendev);
666 * ide_port_wait_ready - wait for port to become ready
669 * This is needed on some PPCs and a bunch of BIOS-less embedded
670 * platforms. Typical cases are:
672 * - The firmware hard reset the disk before booting the kernel,
673 * the drive is still doing it's poweron-reset sequence, that
674 * can take up to 30 seconds.
676 * - The firmware does nothing (or no firmware), the device is
677 * still in POST state (same as above actually).
679 * - Some CD/DVD/Writer combo drives tend to drive the bus during
680 * their reset sequence even when they are non-selected slave
681 * devices, thus preventing discovery of the main HD.
683 * Doing this wait-for-non-busy should not harm any existing
684 * configuration and fix some issues like the above.
688 * Returns 0 on success, error code (< 0) otherwise.
691 static int ide_port_wait_ready(ide_hwif_t *hwif)
695 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
697 /* Let HW settle down a bit from whatever init state we
701 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
702 * I know of at least one disk who takes 31 seconds, I use 35
705 rc = ide_wait_not_busy(hwif, 35000);
709 /* Now make sure both master & slave are ready */
710 for (unit = 0; unit < MAX_DRIVES; unit++) {
711 ide_drive_t *drive = &hwif->drives[unit];
713 /* Ignore disks that we will not probe for later. */
714 if (!drive->noprobe || drive->present) {
716 hwif->tp_ops->set_irq(hwif, 1);
718 rc = ide_wait_not_busy(hwif, 35000);
722 printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
726 /* Exit function with master reselected (let's be sane) */
728 SELECT_DRIVE(&hwif->drives[0]);
734 * ide_undecoded_slave - look for bad CF adapters
735 * @dev1: slave device
737 * Analyse the drives on the interface and attempt to decide if we
738 * have the same drive viewed twice. This occurs with crap CF adapters
739 * and PCMCIA sometimes.
742 void ide_undecoded_slave(ide_drive_t *dev1)
744 ide_drive_t *dev0 = &dev1->hwif->drives[0];
746 if ((dev1->dn & 1) == 0 || dev0->present == 0)
749 /* If the models don't match they are not the same product */
750 if (strcmp((char *)&dev0->id[ATA_ID_PROD],
751 (char *)&dev1->id[ATA_ID_PROD]))
754 /* Serial numbers do not match */
755 if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
756 (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
759 /* No serial number, thankfully very rare for CF */
760 if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
763 /* Appears to be an IDE flash adapter with decode bugs */
764 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
769 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
771 static int ide_probe_port(ide_hwif_t *hwif)
775 int unit, rc = -ENODEV;
777 BUG_ON(hwif->present);
779 if (hwif->drives[0].noprobe && hwif->drives[1].noprobe)
783 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
784 * we'll install our IRQ driver much later...
788 disable_irq(hwif->irq);
790 local_irq_set(flags);
792 if (ide_port_wait_ready(hwif) == -EBUSY)
793 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
796 * Second drive should only exist if first drive was found,
797 * but a lot of cdrom drives are configured as single slaves.
799 for (unit = 0; unit < MAX_DRIVES; ++unit) {
800 ide_drive_t *drive = &hwif->drives[unit];
801 drive->dn = (hwif->channel ? 2 : 0) + unit;
802 (void) probe_for_drive(drive);
807 local_irq_restore(flags);
810 * Use cached IRQ number. It might be (and is...) changed by probe
819 static void ide_port_tune_devices(ide_hwif_t *hwif)
821 const struct ide_port_ops *port_ops = hwif->port_ops;
824 for (unit = 0; unit < MAX_DRIVES; unit++) {
825 ide_drive_t *drive = &hwif->drives[unit];
827 if (drive->present && port_ops && port_ops->quirkproc)
828 port_ops->quirkproc(drive);
831 for (unit = 0; unit < MAX_DRIVES; ++unit) {
832 ide_drive_t *drive = &hwif->drives[unit];
834 if (drive->present) {
835 ide_set_max_pio(drive);
844 for (unit = 0; unit < MAX_DRIVES; ++unit) {
845 ide_drive_t *drive = &hwif->drives[unit];
847 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
848 drive->no_io_32bit = 1;
850 drive->no_io_32bit = drive->id[ATA_ID_DWORD_IO] ? 1 : 0;
856 * save_match() is used to simplify logic in init_irq() below.
858 * A loophole here is that we may not know about a particular
859 * hwif's irq until after that hwif is actually probed/initialized..
860 * This could be a problem for the case where an hwif is on a
861 * dual interface that requires serialization (eg. cmd640) and another
862 * hwif using one of the same irqs is initialized beforehand.
864 * This routine detects and reports such situations, but does not fix them.
866 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
868 ide_hwif_t *m = *match;
870 if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
873 printk(KERN_WARNING "%s: potential IRQ problem with %s and %s\n",
874 hwif->name, new->name, m->name);
876 if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
879 #endif /* MAX_HWIFS > 1 */
884 static int ide_init_queue(ide_drive_t *drive)
886 struct request_queue *q;
887 ide_hwif_t *hwif = HWIF(drive);
888 int max_sectors = 256;
889 int max_sg_entries = PRD_ENTRIES;
892 * Our default set up assumes the normal IDE case,
893 * that is 64K segmenting, standard PRD setup
894 * and LBA28. Some drivers then impose their own
895 * limits and LBA48 we could raise it but as yet
899 q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
903 q->queuedata = drive;
904 blk_queue_segment_boundary(q, 0xffff);
906 if (hwif->rqsize < max_sectors)
907 max_sectors = hwif->rqsize;
908 blk_queue_max_sectors(q, max_sectors);
911 /* When we have an IOMMU, we may have a problem where pci_map_sg()
912 * creates segments that don't completely match our boundary
913 * requirements and thus need to be broken up again. Because it
914 * doesn't align properly either, we may actually have to break up
915 * to more segments than what was we got in the first place, a max
916 * worst case is twice as many.
917 * This will be fixed once we teach pci_map_sg() about our boundary
918 * requirements, hopefully soon. *FIXME*
920 if (!PCI_DMA_BUS_IS_PHYS)
921 max_sg_entries >>= 1;
922 #endif /* CONFIG_PCI */
924 blk_queue_max_hw_segments(q, max_sg_entries);
925 blk_queue_max_phys_segments(q, max_sg_entries);
927 /* assign drive queue */
930 /* needs drive->queue to be set */
931 ide_toggle_bounce(drive, 1);
936 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
938 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
940 spin_lock_irq(&ide_lock);
941 if (!hwgroup->drive) {
942 /* first drive for hwgroup. */
944 hwgroup->drive = drive;
945 hwgroup->hwif = HWIF(hwgroup->drive);
947 drive->next = hwgroup->drive->next;
948 hwgroup->drive->next = drive;
950 spin_unlock_irq(&ide_lock);
954 * For any present drive:
955 * - allocate the block device queue
956 * - link drive into the hwgroup
958 static void ide_port_setup_devices(ide_hwif_t *hwif)
962 mutex_lock(&ide_cfg_mtx);
963 for (i = 0; i < MAX_DRIVES; i++) {
964 ide_drive_t *drive = &hwif->drives[i];
969 if (ide_init_queue(drive)) {
970 printk(KERN_ERR "ide: failed to init %s\n",
975 ide_add_drive_to_hwgroup(drive);
977 mutex_unlock(&ide_cfg_mtx);
980 static ide_hwif_t *ide_ports[MAX_HWIFS];
982 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
984 ide_hwgroup_t *hwgroup = hwif->hwgroup;
986 ide_ports[hwif->index] = NULL;
988 spin_lock_irq(&ide_lock);
990 * Remove us from the hwgroup, and free
991 * the hwgroup if we were the only member
993 if (hwif->next == hwif) {
994 BUG_ON(hwgroup->hwif != hwif);
997 /* There is another interface in hwgroup.
998 * Unlink us, and set hwgroup->drive and ->hwif to
1001 ide_hwif_t *g = hwgroup->hwif;
1003 while (g->next != hwif)
1005 g->next = hwif->next;
1006 if (hwgroup->hwif == hwif) {
1007 /* Chose a random hwif for hwgroup->hwif.
1008 * It's guaranteed that there are no drives
1009 * left in the hwgroup.
1011 BUG_ON(hwgroup->drive != NULL);
1014 BUG_ON(hwgroup->hwif == hwif);
1016 spin_unlock_irq(&ide_lock);
1020 * This routine sets up the irq for an ide interface, and creates a new
1021 * hwgroup for the irq/hwif if none was previously assigned.
1023 * Much of the code is for correctly detecting/handling irq sharing
1024 * and irq serialization situations. This is somewhat complex because
1025 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1027 static int init_irq (ide_hwif_t *hwif)
1029 struct ide_io_ports *io_ports = &hwif->io_ports;
1031 ide_hwgroup_t *hwgroup;
1032 ide_hwif_t *match = NULL;
1034 mutex_lock(&ide_cfg_mtx);
1035 hwif->hwgroup = NULL;
1038 * Group up with any other hwifs that share our irq(s).
1040 for (index = 0; index < MAX_HWIFS; index++) {
1041 ide_hwif_t *h = ide_ports[index];
1043 if (h && h->hwgroup) { /* scan only initialized ports */
1044 if (hwif->irq == h->irq) {
1045 hwif->sharing_irq = h->sharing_irq = 1;
1046 if (hwif->chipset != ide_pci ||
1047 h->chipset != ide_pci) {
1048 save_match(hwif, h, &match);
1051 if (hwif->serialized) {
1052 if (hwif->mate && hwif->mate->irq == h->irq)
1053 save_match(hwif, h, &match);
1055 if (h->serialized) {
1056 if (h->mate && hwif->irq == h->mate->irq)
1057 save_match(hwif, h, &match);
1061 #endif /* MAX_HWIFS > 1 */
1063 * If we are still without a hwgroup, then form a new one
1066 hwgroup = match->hwgroup;
1067 hwif->hwgroup = hwgroup;
1069 * Link us into the hwgroup.
1070 * This must be done early, do ensure that unexpected_intr
1071 * can find the hwif and prevent irq storms.
1072 * No drives are attached to the new hwif, choose_drive
1073 * can't do anything stupid (yet).
1074 * Add ourself as the 2nd entry to the hwgroup->hwif
1075 * linked list, the first entry is the hwif that owns
1076 * hwgroup->handler - do not change that.
1078 spin_lock_irq(&ide_lock);
1079 hwif->next = hwgroup->hwif->next;
1080 hwgroup->hwif->next = hwif;
1081 BUG_ON(hwif->next == hwif);
1082 spin_unlock_irq(&ide_lock);
1084 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1085 hwif_to_node(hwif));
1086 if (hwgroup == NULL)
1089 hwif->hwgroup = hwgroup;
1090 hwgroup->hwif = hwif->next = hwif;
1092 init_timer(&hwgroup->timer);
1093 hwgroup->timer.function = &ide_timer_expiry;
1094 hwgroup->timer.data = (unsigned long) hwgroup;
1097 ide_ports[hwif->index] = hwif;
1100 * Allocate the irq, if not already obtained for another hwif
1102 if (!match || match->irq != hwif->irq) {
1104 #if defined(__mc68000__)
1106 #endif /* __mc68000__ */
1108 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1111 if (io_ports->ctl_addr)
1112 hwif->tp_ops->set_irq(hwif, 1);
1114 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1118 if (!hwif->rqsize) {
1119 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1120 (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1123 hwif->rqsize = 65536;
1126 #if !defined(__mc68000__)
1127 printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1128 io_ports->data_addr, io_ports->status_addr,
1129 io_ports->ctl_addr, hwif->irq);
1131 printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
1132 io_ports->data_addr, hwif->irq);
1133 #endif /* __mc68000__ */
1135 printk(KERN_CONT " (%sed with %s)",
1136 hwif->sharing_irq ? "shar" : "serializ", match->name);
1137 printk(KERN_CONT "\n");
1139 mutex_unlock(&ide_cfg_mtx);
1142 ide_remove_port_from_hwgroup(hwif);
1144 mutex_unlock(&ide_cfg_mtx);
1148 static int ata_lock(dev_t dev, void *data)
1150 /* FIXME: we want to pin hwif down */
1154 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1156 ide_hwif_t *hwif = data;
1157 int unit = *part >> PARTN_BITS;
1158 ide_drive_t *drive = &hwif->drives[unit];
1159 if (!drive->present)
1162 if (drive->media == ide_disk)
1163 request_module("ide-disk");
1165 request_module("ide-scsi");
1166 if (drive->media == ide_cdrom || drive->media == ide_optical)
1167 request_module("ide-cd");
1168 if (drive->media == ide_tape)
1169 request_module("ide-tape");
1170 if (drive->media == ide_floppy)
1171 request_module("ide-floppy");
1176 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1178 struct gendisk *p = data;
1179 *part &= (1 << PARTN_BITS) - 1;
1180 return &disk_to_dev(p)->kobj;
1183 static int exact_lock(dev_t dev, void *data)
1185 struct gendisk *p = data;
1192 void ide_register_region(struct gendisk *disk)
1194 blk_register_region(MKDEV(disk->major, disk->first_minor),
1195 disk->minors, NULL, exact_match, exact_lock, disk);
1198 EXPORT_SYMBOL_GPL(ide_register_region);
1200 void ide_unregister_region(struct gendisk *disk)
1202 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1206 EXPORT_SYMBOL_GPL(ide_unregister_region);
1208 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1210 ide_hwif_t *hwif = drive->hwif;
1211 unsigned int unit = (drive->select.all >> 4) & 1;
1213 disk->major = hwif->major;
1214 disk->first_minor = unit << PARTN_BITS;
1215 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1216 disk->queue = drive->queue;
1219 EXPORT_SYMBOL_GPL(ide_init_disk);
1221 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1223 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1225 if (drive == drive->next) {
1226 /* special case: last drive from hwgroup. */
1227 BUG_ON(hwgroup->drive != drive);
1228 hwgroup->drive = NULL;
1232 walk = hwgroup->drive;
1233 while (walk->next != drive)
1235 walk->next = drive->next;
1236 if (hwgroup->drive == drive) {
1237 hwgroup->drive = drive->next;
1238 hwgroup->hwif = hwgroup->drive->hwif;
1241 BUG_ON(hwgroup->drive == drive);
1244 static void drive_release_dev (struct device *dev)
1246 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1248 ide_proc_unregister_device(drive);
1250 spin_lock_irq(&ide_lock);
1251 ide_remove_drive_from_hwgroup(drive);
1255 /* Messed up locking ... */
1256 spin_unlock_irq(&ide_lock);
1257 blk_cleanup_queue(drive->queue);
1258 spin_lock_irq(&ide_lock);
1259 drive->queue = NULL;
1260 spin_unlock_irq(&ide_lock);
1262 complete(&drive->gendev_rel_comp);
1265 static int hwif_init(ide_hwif_t *hwif)
1270 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1272 printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
1277 if (register_blkdev(hwif->major, hwif->name))
1280 if (!hwif->sg_max_nents)
1281 hwif->sg_max_nents = PRD_ENTRIES;
1283 hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1285 if (!hwif->sg_table) {
1286 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1290 sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1292 if (init_irq(hwif) == 0)
1295 old_irq = hwif->irq;
1297 * It failed to initialise. Find the default IRQ for
1298 * this port and try that.
1300 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1302 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1303 hwif->name, old_irq);
1306 if (init_irq(hwif)) {
1307 printk(KERN_ERR "%s: probed IRQ %d and default IRQ %d failed\n",
1308 hwif->name, old_irq, hwif->irq);
1311 printk(KERN_WARNING "%s: probed IRQ %d failed, using default\n",
1312 hwif->name, hwif->irq);
1315 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1316 THIS_MODULE, ata_probe, ata_lock, hwif);
1320 unregister_blkdev(hwif->major, hwif->name);
1324 static void hwif_register_devices(ide_hwif_t *hwif)
1328 for (i = 0; i < MAX_DRIVES; i++) {
1329 ide_drive_t *drive = &hwif->drives[i];
1330 struct device *dev = &drive->gendev;
1333 if (!drive->present)
1336 ide_add_generic_settings(drive);
1338 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1339 dev->parent = &hwif->gendev;
1340 dev->bus = &ide_bus_type;
1341 dev->driver_data = drive;
1342 dev->release = drive_release_dev;
1344 ret = device_register(dev);
1346 printk(KERN_WARNING "IDE: %s: device_register error: "
1347 "%d\n", __func__, ret);
1351 static void ide_port_init_devices(ide_hwif_t *hwif)
1353 const struct ide_port_ops *port_ops = hwif->port_ops;
1356 for (i = 0; i < MAX_DRIVES; i++) {
1357 ide_drive_t *drive = &hwif->drives[i];
1359 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1360 drive->io_32bit = 1;
1361 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1363 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1364 drive->no_unmask = 1;
1366 if (port_ops && port_ops->init_dev)
1367 port_ops->init_dev(drive);
1371 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1372 const struct ide_port_info *d)
1374 hwif->channel = port;
1377 hwif->chipset = d->chipset;
1382 if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1383 (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1384 hwif->irq = port ? 15 : 14;
1386 /* ->host_flags may be set by ->init_iops (or even earlier...) */
1387 hwif->host_flags |= d->host_flags;
1388 hwif->pio_mask = d->pio_mask;
1391 hwif->tp_ops = d->tp_ops;
1393 /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1394 if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1395 hwif->port_ops = d->port_ops;
1397 hwif->swdma_mask = d->swdma_mask;
1398 hwif->mwdma_mask = d->mwdma_mask;
1399 hwif->ultra_mask = d->udma_mask;
1401 if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1405 rc = d->init_dma(hwif, d);
1407 rc = ide_hwif_setup_dma(hwif, d);
1410 printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1412 hwif->swdma_mask = 0;
1413 hwif->mwdma_mask = 0;
1414 hwif->ultra_mask = 0;
1415 } else if (d->dma_ops)
1416 hwif->dma_ops = d->dma_ops;
1419 if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1420 ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1422 hwif->mate->serialized = hwif->serialized = 1;
1425 if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1428 /* call chipset specific routine for each enabled port */
1433 static void ide_port_cable_detect(ide_hwif_t *hwif)
1435 const struct ide_port_ops *port_ops = hwif->port_ops;
1437 if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1438 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1439 hwif->cbl = port_ops->cable_detect(hwif);
1443 static ssize_t store_delete_devices(struct device *portdev,
1444 struct device_attribute *attr,
1445 const char *buf, size_t n)
1447 ide_hwif_t *hwif = dev_get_drvdata(portdev);
1449 if (strncmp(buf, "1", n))
1452 ide_port_unregister_devices(hwif);
1457 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1459 static ssize_t store_scan(struct device *portdev,
1460 struct device_attribute *attr,
1461 const char *buf, size_t n)
1463 ide_hwif_t *hwif = dev_get_drvdata(portdev);
1465 if (strncmp(buf, "1", n))
1468 ide_port_unregister_devices(hwif);
1469 ide_port_scan(hwif);
1474 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1476 static struct device_attribute *ide_port_attrs[] = {
1477 &dev_attr_delete_devices,
1482 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1484 int i, uninitialized_var(rc);
1486 for (i = 0; ide_port_attrs[i]; i++) {
1487 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1495 static unsigned int ide_indexes;
1498 * ide_find_port_slot - find free port slot
1501 * Return the new port slot index or -ENOENT if we are out of free slots.
1504 static int ide_find_port_slot(const struct ide_port_info *d)
1507 u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1508 u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1511 * Claim an unassigned slot.
1513 * Give preference to claiming other slots before claiming ide0/ide1,
1514 * just in case there's another interface yet-to-be-scanned
1515 * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1517 * Unless there is a bootable card that does not use the standard
1518 * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1520 mutex_lock(&ide_cfg_mtx);
1521 if (MAX_HWIFS == 1) {
1522 if (ide_indexes == 0 && i == 0)
1526 if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1527 idx = ffz(ide_indexes | i);
1529 if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1530 idx = ffz(ide_indexes | 3);
1531 else if ((ide_indexes & 3) != 3)
1532 idx = ffz(ide_indexes);
1536 ide_indexes |= (1 << idx);
1537 mutex_unlock(&ide_cfg_mtx);
1542 static void ide_free_port_slot(int idx)
1544 mutex_lock(&ide_cfg_mtx);
1545 ide_indexes &= ~(1 << idx);
1546 mutex_unlock(&ide_cfg_mtx);
1549 struct ide_host *ide_host_alloc_all(const struct ide_port_info *d,
1552 struct ide_host *host;
1555 host = kzalloc(sizeof(*host), GFP_KERNEL);
1559 for (i = 0; i < MAX_HWIFS; i++) {
1566 hwif = kzalloc(sizeof(*hwif), GFP_KERNEL);
1570 idx = ide_find_port_slot(d);
1572 printk(KERN_ERR "%s: no free slot for interface\n",
1573 d ? d->name : "ide");
1578 ide_init_port_data(hwif, idx);
1582 host->ports[i] = hwif;
1586 if (host->n_ports == 0) {
1592 host->dev[0] = hws[0]->dev;
1595 host->host_flags = d->host_flags;
1599 EXPORT_SYMBOL_GPL(ide_host_alloc_all);
1601 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1603 hw_regs_t *hws_all[MAX_HWIFS];
1606 for (i = 0; i < MAX_HWIFS; i++)
1607 hws_all[i] = (i < 4) ? hws[i] : NULL;
1609 return ide_host_alloc_all(d, hws_all);
1611 EXPORT_SYMBOL_GPL(ide_host_alloc);
1613 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1616 ide_hwif_t *hwif, *mate = NULL;
1619 for (i = 0; i < MAX_HWIFS; i++) {
1620 hwif = host->ports[i];
1627 ide_init_port_hw(hwif, hws[i]);
1628 ide_port_apply_params(hwif);
1635 if ((i & 1) && mate) {
1640 mate = (i & 1) ? NULL : hwif;
1642 ide_init_port(hwif, i & 1, d);
1643 ide_port_cable_detect(hwif);
1644 ide_port_init_devices(hwif);
1647 for (i = 0; i < MAX_HWIFS; i++) {
1648 hwif = host->ports[i];
1653 if (ide_probe_port(hwif) == 0)
1656 if (hwif->chipset != ide_4drives || !hwif->mate ||
1657 !hwif->mate->present)
1658 ide_register_port(hwif);
1661 ide_port_tune_devices(hwif);
1664 for (i = 0; i < MAX_HWIFS; i++) {
1665 hwif = host->ports[i];
1670 if (hwif_init(hwif) == 0) {
1671 printk(KERN_INFO "%s: failed to initialize IDE "
1672 "interface\n", hwif->name);
1680 ide_port_setup_devices(hwif);
1682 ide_acpi_init(hwif);
1685 ide_acpi_port_init_devices(hwif);
1688 for (i = 0; i < MAX_HWIFS; i++) {
1689 hwif = host->ports[i];
1694 if (hwif->chipset == ide_unknown)
1695 hwif->chipset = ide_generic;
1698 hwif_register_devices(hwif);
1701 for (i = 0; i < MAX_HWIFS; i++) {
1702 hwif = host->ports[i];
1707 ide_sysfs_register_port(hwif);
1708 ide_proc_register_port(hwif);
1711 ide_proc_port_register_devices(hwif);
1716 EXPORT_SYMBOL_GPL(ide_host_register);
1718 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1719 struct ide_host **hostp)
1721 struct ide_host *host;
1724 host = ide_host_alloc(d, hws);
1728 rc = ide_host_register(host, d, hws);
1730 ide_host_free(host);
1739 EXPORT_SYMBOL_GPL(ide_host_add);
1741 void ide_host_free(struct ide_host *host)
1746 for (i = 0; i < MAX_HWIFS; i++) {
1747 hwif = host->ports[i];
1752 ide_free_port_slot(hwif->index);
1758 EXPORT_SYMBOL_GPL(ide_host_free);
1760 void ide_host_remove(struct ide_host *host)
1764 for (i = 0; i < MAX_HWIFS; i++) {
1766 ide_unregister(host->ports[i]);
1769 ide_host_free(host);
1771 EXPORT_SYMBOL_GPL(ide_host_remove);
1773 void ide_port_scan(ide_hwif_t *hwif)
1775 ide_port_apply_params(hwif);
1776 ide_port_cable_detect(hwif);
1777 ide_port_init_devices(hwif);
1779 if (ide_probe_port(hwif) < 0)
1784 ide_port_tune_devices(hwif);
1785 ide_acpi_port_init_devices(hwif);
1786 ide_port_setup_devices(hwif);
1787 hwif_register_devices(hwif);
1788 ide_proc_port_register_devices(hwif);
1790 EXPORT_SYMBOL_GPL(ide_port_scan);
1792 static void ide_legacy_init_one(hw_regs_t **hws, hw_regs_t *hw,
1793 u8 port_no, const struct ide_port_info *d,
1794 unsigned long config)
1796 unsigned long base, ctl;
1809 if (!request_region(base, 8, d->name)) {
1810 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1811 d->name, base, base + 7);
1815 if (!request_region(ctl, 1, d->name)) {
1816 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1818 release_region(base, 8);
1822 ide_std_init_ports(hw, base, ctl);
1824 hw->chipset = d->chipset;
1825 hw->config = config;
1830 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1832 hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
1834 memset(&hw, 0, sizeof(hw));
1836 if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1837 ide_legacy_init_one(hws, &hw[0], 0, d, config);
1838 ide_legacy_init_one(hws, &hw[1], 1, d, config);
1840 if (hws[0] == NULL && hws[1] == NULL &&
1841 (d->host_flags & IDE_HFLAG_SINGLE))
1844 return ide_host_add(d, hws, NULL);
1846 EXPORT_SYMBOL_GPL(ide_legacy_device_add);