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 if ((max_multsect / 2) > 1)
93 id[ATA_ID_MULTSECT] = max_multsect | 0x100;
95 id[ATA_ID_MULTSECT] &= ~0x1ff;
97 drive->mult_req = id[ATA_ID_MULTSECT] & 0xff;
100 drive->special.b.set_multmode = 1;
105 * do_identify - identify a drive
106 * @drive: drive to identify
109 * Called when we have issued a drive identify command to
110 * read and parse the results. This function is run with
111 * interrupts disabled.
114 static inline void do_identify (ide_drive_t *drive, u8 cmd)
116 ide_hwif_t *hwif = HWIF(drive);
118 char *m = (char *)&id[ATA_ID_PROD];
119 int bswap = 1, is_cfa;
121 /* read 512 bytes of id info */
122 hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
127 printk(KERN_INFO "%s: dumping identify data\n", drive->name);
128 ide_dump_identify((u8 *)id);
133 * ATA_CMD_ID_ATA returns little-endian info,
134 * ATA_CMD_ID_ATAPI *usually* returns little-endian info.
136 if (cmd == ATA_CMD_ID_ATAPI) {
137 if ((m[0] == 'N' && m[1] == 'E') || /* NEC */
138 (m[0] == 'F' && m[1] == 'X') || /* Mitsumi */
139 (m[0] == 'P' && m[1] == 'i')) /* Pioneer */
140 /* Vertos drives may still be weird */
144 ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
145 ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
146 ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
148 /* we depend on this a lot! */
149 m[ATA_ID_PROD_LEN - 1] = '\0';
151 if (strstr(m, "E X A B Y T E N E S T"))
154 printk(KERN_INFO "%s: %s, ", drive->name, m);
160 * Check for an ATAPI device
162 if (cmd == ATA_CMD_ID_ATAPI) {
163 u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;
165 printk(KERN_CONT "ATAPI ");
168 if (!strstr(m, "CD-ROM")) {
169 if (!strstr(m, "oppy") &&
170 !strstr(m, "poyp") &&
172 printk(KERN_CONT "cdrom or floppy?, assuming ");
173 if (drive->media != ide_cdrom) {
174 printk(KERN_CONT "FLOPPY");
175 drive->removable = 1;
179 /* Early cdrom models used zero */
182 drive->removable = 1;
184 /* kludge for Apple PowerBook internal zip */
185 if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
186 printk(KERN_CONT "FLOPPY");
191 printk(KERN_CONT "CD/DVD-ROM");
194 printk(KERN_CONT "TAPE");
197 printk(KERN_CONT "OPTICAL");
198 drive->removable = 1;
201 printk(KERN_CONT "UNKNOWN (type %d)", type);
204 printk(KERN_CONT " drive\n");
206 /* an ATAPI device ignores DRDY */
207 drive->ready_stat = 0;
212 * Not an ATAPI device: looks like a "regular" hard disk
215 is_cfa = ata_id_is_cfa(id);
217 /* CF devices are *not* removable in Linux definition of the term */
218 if (is_cfa == 0 && (id[ATA_ID_CONFIG] & (1 << 7)))
219 drive->removable = 1;
221 drive->media = ide_disk;
223 printk(KERN_CONT "%s DISK drive\n", is_cfa ? "CFA" : "ATA");
234 * actual_try_to_identify - send ata/atapi identify
235 * @drive: drive to identify
236 * @cmd: command to use
238 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
239 * and waits for a response. It also monitors irqs while this is
240 * happening, in hope of automatically determining which one is
241 * being used by the interface.
243 * Returns: 0 device was identified
244 * 1 device timed-out (no response to identify request)
245 * 2 device aborted the command (refused to identify itself)
248 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
250 ide_hwif_t *hwif = HWIF(drive);
251 struct ide_io_ports *io_ports = &hwif->io_ports;
252 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
253 int use_altstatus = 0, rc;
254 unsigned long timeout;
257 /* take a deep breath */
260 if (io_ports->ctl_addr) {
261 a = tp_ops->read_altstatus(hwif);
262 s = tp_ops->read_status(hwif);
263 if ((a ^ s) & ~ATA_IDX)
264 /* ancient Seagate drives, broken interfaces */
265 printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
266 "instead of ALTSTATUS(0x%02x)\n",
269 /* use non-intrusive polling */
273 /* set features register for atapi
274 * identify command to be sure of reply
276 if (cmd == ATA_CMD_ID_ATAPI) {
279 memset(&task, 0, sizeof(task));
280 /* disable DMA & overlap */
281 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
283 tp_ops->tf_load(drive, &task);
286 /* ask drive for ID */
287 tp_ops->exec_command(hwif, cmd);
289 timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
291 if (ide_busy_sleep(hwif, timeout, use_altstatus))
294 /* wait for IRQ and ATA_DRQ */
296 s = tp_ops->read_status(hwif);
298 if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
301 /* local CPU only; some systems need this */
302 local_irq_save(flags);
303 /* drive returned ID */
304 do_identify(drive, cmd);
305 /* drive responded with ID */
307 /* clear drive IRQ */
308 (void)tp_ops->read_status(hwif);
309 local_irq_restore(flags);
311 /* drive refused ID */
318 * try_to_identify - try to identify a drive
319 * @drive: drive to probe
320 * @cmd: command to use
322 * Issue the identify command and then do IRQ probing to
323 * complete the identification when needed by finding the
324 * IRQ the drive is attached to
327 static int try_to_identify (ide_drive_t *drive, u8 cmd)
329 ide_hwif_t *hwif = HWIF(drive);
330 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
333 unsigned long cookie = 0;
336 * Disable device irq unless we need to
337 * probe for it. Otherwise we'll get spurious
338 * interrupts during the identify-phase that
339 * the irq handler isn't expecting.
341 if (hwif->io_ports.ctl_addr) {
344 cookie = probe_irq_on();
346 tp_ops->set_irq(hwif, autoprobe);
349 retval = actual_try_to_identify(drive, cmd);
354 tp_ops->set_irq(hwif, 0);
355 /* clear drive IRQ */
356 (void)tp_ops->read_status(hwif);
358 irq = probe_irq_off(cookie);
363 /* Mmmm.. multiple IRQs..
364 * don't know which was ours
366 printk(KERN_ERR "%s: IRQ probe failed (0x%lx)\n",
367 drive->name, cookie);
374 int ide_busy_sleep(ide_hwif_t *hwif, unsigned long timeout, int altstatus)
381 msleep(50); /* give drive a breather */
382 stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
383 : hwif->tp_ops->read_status(hwif);
384 if ((stat & ATA_BUSY) == 0)
386 } while (time_before(jiffies, timeout));
388 return 1; /* drive timed-out */
391 static u8 ide_read_device(ide_drive_t *drive)
395 memset(&task, 0, sizeof(task));
396 task.tf_flags = IDE_TFLAG_IN_DEVICE;
398 drive->hwif->tp_ops->tf_read(drive, &task);
400 return task.tf.device;
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)
426 ide_hwif_t *hwif = HWIF(drive);
427 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
431 if (drive->present) {
432 /* avoid waiting for inappropriate probes */
433 if (drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
437 printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
438 drive->name, drive->present, drive->media,
439 (cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
442 /* needed for some systems
443 * (e.g. crw9624 as drive0 with disk as slave)
449 if (ide_read_device(drive) != drive->select.all && !drive->present) {
450 if (drive->select.b.unit != 0) {
451 /* exit with drive0 selected */
452 SELECT_DRIVE(&hwif->drives[0]);
453 /* allow ATA_BUSY to assert & clear */
456 /* no i/f present: mmm.. this should be a 4 -ml */
460 stat = tp_ops->read_status(hwif);
462 if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
463 drive->present || cmd == ATA_CMD_ID_ATAPI) {
464 /* send cmd and wait */
465 if ((rc = try_to_identify(drive, cmd))) {
466 /* failed: try again */
467 rc = try_to_identify(drive,cmd);
470 stat = tp_ops->read_status(hwif);
472 if (stat == (ATA_BUSY | ATA_DRDY))
475 if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
476 printk(KERN_ERR "%s: no response (status = 0x%02x), "
477 "resetting drive\n", drive->name, stat);
481 tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
482 (void)ide_busy_sleep(hwif, WAIT_WORSTCASE, 0);
483 rc = try_to_identify(drive, cmd);
486 /* ensure drive IRQ is clear */
487 stat = tp_ops->read_status(hwif);
490 printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
493 /* not present or maybe ATAPI */
496 if (drive->select.b.unit != 0) {
497 /* exit with drive0 selected */
498 SELECT_DRIVE(&hwif->drives[0]);
500 /* ensure drive irq is clear */
501 (void)tp_ops->read_status(hwif);
509 static void enable_nest (ide_drive_t *drive)
511 ide_hwif_t *hwif = HWIF(drive);
512 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
515 printk(KERN_INFO "%s: enabling %s -- ",
516 hwif->name, (char *)&drive->id[ATA_ID_PROD]);
520 tp_ops->exec_command(hwif, ATA_EXABYTE_ENABLE_NEST);
522 if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 0)) {
523 printk(KERN_CONT "failed (timeout)\n");
529 stat = tp_ops->read_status(hwif);
531 if (!OK_STAT(stat, 0, BAD_STAT))
532 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
534 printk(KERN_CONT "success\n");
538 * probe_for_drives - upper level drive probe
539 * @drive: drive to probe for
541 * probe_for_drive() tests for existence of a given drive using do_probe()
542 * and presents things to the user as needed.
544 * Returns: 0 no device was found
545 * 1 device was found (note: drive->present might
549 static inline u8 probe_for_drive (ide_drive_t *drive)
554 * In order to keep things simple we have an id
555 * block for all drives at all times. If the device
556 * is pre ATA or refuses ATA/ATAPI identify we
557 * will add faked data to this.
559 * Also note that 0 everywhere means "can't do X"
562 drive->id = kzalloc(SECTOR_SIZE, GFP_KERNEL);
564 if(drive->id == NULL)
566 printk(KERN_ERR "ide: out of memory for id data.\n");
570 m = (char *)&drive->id[ATA_ID_PROD];
571 strcpy(m, "UNKNOWN");
574 if (!drive->noprobe) {
576 /* if !(success||timed-out) */
577 if (do_probe(drive, ATA_CMD_ID_ATA) >= 2)
578 /* look for ATAPI device */
579 (void)do_probe(drive, ATA_CMD_ID_ATAPI);
582 /* drive not found */
585 if (strstr(m, "E X A B Y T E N E S T")) {
590 /* identification failed? */
591 if (!drive->id_read) {
592 if (drive->media == ide_disk) {
593 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
594 drive->name, drive->cyl,
595 drive->head, drive->sect);
596 } else if (drive->media == ide_cdrom) {
597 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
600 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
604 /* drive was found */
608 /* The drive wasn't being helpful. Add generic info only */
609 if (drive->id_read == 0) {
614 if (drive->media == ide_disk) {
615 ide_disk_init_chs(drive);
616 ide_disk_init_mult_count(drive);
619 return drive->present;
622 static void hwif_release_dev(struct device *dev)
624 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
626 complete(&hwif->gendev_rel_comp);
629 static int ide_register_port(ide_hwif_t *hwif)
633 /* register with global device tree */
634 strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
635 hwif->gendev.driver_data = hwif;
636 if (hwif->gendev.parent == NULL) {
638 hwif->gendev.parent = hwif->dev;
640 /* Would like to do = &device_legacy */
641 hwif->gendev.parent = NULL;
643 hwif->gendev.release = hwif_release_dev;
644 ret = device_register(&hwif->gendev);
646 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
651 hwif->portdev = device_create_drvdata(ide_port_class, &hwif->gendev,
652 MKDEV(0, 0), hwif, hwif->name);
653 if (IS_ERR(hwif->portdev)) {
654 ret = PTR_ERR(hwif->portdev);
655 device_unregister(&hwif->gendev);
662 * ide_port_wait_ready - wait for port to become ready
665 * This is needed on some PPCs and a bunch of BIOS-less embedded
666 * platforms. Typical cases are:
668 * - The firmware hard reset the disk before booting the kernel,
669 * the drive is still doing it's poweron-reset sequence, that
670 * can take up to 30 seconds.
672 * - The firmware does nothing (or no firmware), the device is
673 * still in POST state (same as above actually).
675 * - Some CD/DVD/Writer combo drives tend to drive the bus during
676 * their reset sequence even when they are non-selected slave
677 * devices, thus preventing discovery of the main HD.
679 * Doing this wait-for-non-busy should not harm any existing
680 * configuration and fix some issues like the above.
684 * Returns 0 on success, error code (< 0) otherwise.
687 static int ide_port_wait_ready(ide_hwif_t *hwif)
691 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
693 /* Let HW settle down a bit from whatever init state we
697 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
698 * I know of at least one disk who takes 31 seconds, I use 35
701 rc = ide_wait_not_busy(hwif, 35000);
705 /* Now make sure both master & slave are ready */
706 for (unit = 0; unit < MAX_DRIVES; unit++) {
707 ide_drive_t *drive = &hwif->drives[unit];
709 /* Ignore disks that we will not probe for later. */
710 if (!drive->noprobe || drive->present) {
712 hwif->tp_ops->set_irq(hwif, 1);
714 rc = ide_wait_not_busy(hwif, 35000);
718 printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
722 /* Exit function with master reselected (let's be sane) */
724 SELECT_DRIVE(&hwif->drives[0]);
730 * ide_undecoded_slave - look for bad CF adapters
731 * @dev1: slave device
733 * Analyse the drives on the interface and attempt to decide if we
734 * have the same drive viewed twice. This occurs with crap CF adapters
735 * and PCMCIA sometimes.
738 void ide_undecoded_slave(ide_drive_t *dev1)
740 ide_drive_t *dev0 = &dev1->hwif->drives[0];
742 if ((dev1->dn & 1) == 0 || dev0->present == 0)
745 /* If the models don't match they are not the same product */
746 if (strcmp((char *)&dev0->id[ATA_ID_PROD],
747 (char *)&dev1->id[ATA_ID_PROD]))
750 /* Serial numbers do not match */
751 if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
752 (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
755 /* No serial number, thankfully very rare for CF */
756 if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
759 /* Appears to be an IDE flash adapter with decode bugs */
760 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
765 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
767 static int ide_probe_port(ide_hwif_t *hwif)
771 int unit, rc = -ENODEV;
773 BUG_ON(hwif->present);
775 if (hwif->drives[0].noprobe && hwif->drives[1].noprobe)
779 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
780 * we'll install our IRQ driver much later...
784 disable_irq(hwif->irq);
786 local_irq_set(flags);
788 if (ide_port_wait_ready(hwif) == -EBUSY)
789 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
792 * Second drive should only exist if first drive was found,
793 * but a lot of cdrom drives are configured as single slaves.
795 for (unit = 0; unit < MAX_DRIVES; ++unit) {
796 ide_drive_t *drive = &hwif->drives[unit];
797 drive->dn = (hwif->channel ? 2 : 0) + unit;
798 (void) probe_for_drive(drive);
803 local_irq_restore(flags);
806 * Use cached IRQ number. It might be (and is...) changed by probe
815 static void ide_port_tune_devices(ide_hwif_t *hwif)
817 const struct ide_port_ops *port_ops = hwif->port_ops;
820 for (unit = 0; unit < MAX_DRIVES; unit++) {
821 ide_drive_t *drive = &hwif->drives[unit];
823 if (drive->present && port_ops && port_ops->quirkproc)
824 port_ops->quirkproc(drive);
827 for (unit = 0; unit < MAX_DRIVES; ++unit) {
828 ide_drive_t *drive = &hwif->drives[unit];
830 if (drive->present) {
831 ide_set_max_pio(drive);
840 for (unit = 0; unit < MAX_DRIVES; ++unit) {
841 ide_drive_t *drive = &hwif->drives[unit];
843 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
844 drive->no_io_32bit = 1;
846 drive->no_io_32bit = drive->id[ATA_ID_DWORD_IO] ? 1 : 0;
851 * save_match() is used to simplify logic in init_irq() below.
853 * A loophole here is that we may not know about a particular
854 * hwif's irq until after that hwif is actually probed/initialized..
855 * This could be a problem for the case where an hwif is on a
856 * dual interface that requires serialization (eg. cmd640) and another
857 * hwif using one of the same irqs is initialized beforehand.
859 * This routine detects and reports such situations, but does not fix them.
861 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
863 ide_hwif_t *m = *match;
865 if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
868 printk(KERN_WARNING "%s: potential IRQ problem with %s and %s\n",
869 hwif->name, new->name, m->name);
871 if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
878 static int ide_init_queue(ide_drive_t *drive)
880 struct request_queue *q;
881 ide_hwif_t *hwif = HWIF(drive);
882 int max_sectors = 256;
883 int max_sg_entries = PRD_ENTRIES;
886 * Our default set up assumes the normal IDE case,
887 * that is 64K segmenting, standard PRD setup
888 * and LBA28. Some drivers then impose their own
889 * limits and LBA48 we could raise it but as yet
893 q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
897 q->queuedata = drive;
898 blk_queue_segment_boundary(q, 0xffff);
900 if (hwif->rqsize < max_sectors)
901 max_sectors = hwif->rqsize;
902 blk_queue_max_sectors(q, max_sectors);
905 /* When we have an IOMMU, we may have a problem where pci_map_sg()
906 * creates segments that don't completely match our boundary
907 * requirements and thus need to be broken up again. Because it
908 * doesn't align properly either, we may actually have to break up
909 * to more segments than what was we got in the first place, a max
910 * worst case is twice as many.
911 * This will be fixed once we teach pci_map_sg() about our boundary
912 * requirements, hopefully soon. *FIXME*
914 if (!PCI_DMA_BUS_IS_PHYS)
915 max_sg_entries >>= 1;
916 #endif /* CONFIG_PCI */
918 blk_queue_max_hw_segments(q, max_sg_entries);
919 blk_queue_max_phys_segments(q, max_sg_entries);
921 /* assign drive queue */
924 /* needs drive->queue to be set */
925 ide_toggle_bounce(drive, 1);
930 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
932 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
934 spin_lock_irq(&ide_lock);
935 if (!hwgroup->drive) {
936 /* first drive for hwgroup. */
938 hwgroup->drive = drive;
939 hwgroup->hwif = HWIF(hwgroup->drive);
941 drive->next = hwgroup->drive->next;
942 hwgroup->drive->next = drive;
944 spin_unlock_irq(&ide_lock);
948 * For any present drive:
949 * - allocate the block device queue
950 * - link drive into the hwgroup
952 static void ide_port_setup_devices(ide_hwif_t *hwif)
956 mutex_lock(&ide_cfg_mtx);
957 for (i = 0; i < MAX_DRIVES; i++) {
958 ide_drive_t *drive = &hwif->drives[i];
963 if (ide_init_queue(drive)) {
964 printk(KERN_ERR "ide: failed to init %s\n",
969 ide_add_drive_to_hwgroup(drive);
971 mutex_unlock(&ide_cfg_mtx);
974 static ide_hwif_t *ide_ports[MAX_HWIFS];
976 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
978 ide_hwgroup_t *hwgroup = hwif->hwgroup;
980 ide_ports[hwif->index] = NULL;
982 spin_lock_irq(&ide_lock);
984 * Remove us from the hwgroup, and free
985 * the hwgroup if we were the only member
987 if (hwif->next == hwif) {
988 BUG_ON(hwgroup->hwif != hwif);
991 /* There is another interface in hwgroup.
992 * Unlink us, and set hwgroup->drive and ->hwif to
995 ide_hwif_t *g = hwgroup->hwif;
997 while (g->next != hwif)
999 g->next = hwif->next;
1000 if (hwgroup->hwif == hwif) {
1001 /* Chose a random hwif for hwgroup->hwif.
1002 * It's guaranteed that there are no drives
1003 * left in the hwgroup.
1005 BUG_ON(hwgroup->drive != NULL);
1008 BUG_ON(hwgroup->hwif == hwif);
1010 spin_unlock_irq(&ide_lock);
1014 * This routine sets up the irq for an ide interface, and creates a new
1015 * hwgroup for the irq/hwif if none was previously assigned.
1017 * Much of the code is for correctly detecting/handling irq sharing
1018 * and irq serialization situations. This is somewhat complex because
1019 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1021 static int init_irq (ide_hwif_t *hwif)
1023 struct ide_io_ports *io_ports = &hwif->io_ports;
1025 ide_hwgroup_t *hwgroup;
1026 ide_hwif_t *match = NULL;
1028 mutex_lock(&ide_cfg_mtx);
1029 hwif->hwgroup = NULL;
1032 * Group up with any other hwifs that share our irq(s).
1034 for (index = 0; index < MAX_HWIFS; index++) {
1035 ide_hwif_t *h = ide_ports[index];
1037 if (h && h->hwgroup) { /* scan only initialized ports */
1038 if (hwif->irq == h->irq) {
1039 hwif->sharing_irq = h->sharing_irq = 1;
1040 if (hwif->chipset != ide_pci ||
1041 h->chipset != ide_pci) {
1042 save_match(hwif, h, &match);
1045 if (hwif->serialized) {
1046 if (hwif->mate && hwif->mate->irq == h->irq)
1047 save_match(hwif, h, &match);
1049 if (h->serialized) {
1050 if (h->mate && hwif->irq == h->mate->irq)
1051 save_match(hwif, h, &match);
1057 * If we are still without a hwgroup, then form a new one
1060 hwgroup = match->hwgroup;
1061 hwif->hwgroup = hwgroup;
1063 * Link us into the hwgroup.
1064 * This must be done early, do ensure that unexpected_intr
1065 * can find the hwif and prevent irq storms.
1066 * No drives are attached to the new hwif, choose_drive
1067 * can't do anything stupid (yet).
1068 * Add ourself as the 2nd entry to the hwgroup->hwif
1069 * linked list, the first entry is the hwif that owns
1070 * hwgroup->handler - do not change that.
1072 spin_lock_irq(&ide_lock);
1073 hwif->next = hwgroup->hwif->next;
1074 hwgroup->hwif->next = hwif;
1075 BUG_ON(hwif->next == hwif);
1076 spin_unlock_irq(&ide_lock);
1078 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1079 hwif_to_node(hwif));
1080 if (hwgroup == NULL)
1083 hwif->hwgroup = hwgroup;
1084 hwgroup->hwif = hwif->next = hwif;
1086 init_timer(&hwgroup->timer);
1087 hwgroup->timer.function = &ide_timer_expiry;
1088 hwgroup->timer.data = (unsigned long) hwgroup;
1091 ide_ports[hwif->index] = hwif;
1094 * Allocate the irq, if not already obtained for another hwif
1096 if (!match || match->irq != hwif->irq) {
1098 #if defined(__mc68000__)
1100 #endif /* __mc68000__ */
1102 if (hwif->chipset == ide_pci || hwif->chipset == ide_cmd646 ||
1103 hwif->chipset == ide_ali14xx)
1106 if (io_ports->ctl_addr)
1107 hwif->tp_ops->set_irq(hwif, 1);
1109 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1113 if (!hwif->rqsize) {
1114 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1115 (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1118 hwif->rqsize = 65536;
1121 #if !defined(__mc68000__)
1122 printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1123 io_ports->data_addr, io_ports->status_addr,
1124 io_ports->ctl_addr, hwif->irq);
1126 printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
1127 io_ports->data_addr, hwif->irq);
1128 #endif /* __mc68000__ */
1130 printk(KERN_CONT " (%sed with %s)",
1131 hwif->sharing_irq ? "shar" : "serializ", match->name);
1132 printk(KERN_CONT "\n");
1134 mutex_unlock(&ide_cfg_mtx);
1137 ide_remove_port_from_hwgroup(hwif);
1139 mutex_unlock(&ide_cfg_mtx);
1143 static int ata_lock(dev_t dev, void *data)
1145 /* FIXME: we want to pin hwif down */
1149 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1151 ide_hwif_t *hwif = data;
1152 int unit = *part >> PARTN_BITS;
1153 ide_drive_t *drive = &hwif->drives[unit];
1154 if (!drive->present)
1157 if (drive->media == ide_disk)
1158 request_module("ide-disk");
1160 request_module("ide-scsi");
1161 if (drive->media == ide_cdrom || drive->media == ide_optical)
1162 request_module("ide-cd");
1163 if (drive->media == ide_tape)
1164 request_module("ide-tape");
1165 if (drive->media == ide_floppy)
1166 request_module("ide-floppy");
1171 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1173 struct gendisk *p = data;
1174 *part &= (1 << PARTN_BITS) - 1;
1175 return &disk_to_dev(p)->kobj;
1178 static int exact_lock(dev_t dev, void *data)
1180 struct gendisk *p = data;
1187 void ide_register_region(struct gendisk *disk)
1189 blk_register_region(MKDEV(disk->major, disk->first_minor),
1190 disk->minors, NULL, exact_match, exact_lock, disk);
1193 EXPORT_SYMBOL_GPL(ide_register_region);
1195 void ide_unregister_region(struct gendisk *disk)
1197 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1201 EXPORT_SYMBOL_GPL(ide_unregister_region);
1203 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1205 ide_hwif_t *hwif = drive->hwif;
1206 unsigned int unit = (drive->select.all >> 4) & 1;
1208 disk->major = hwif->major;
1209 disk->first_minor = unit << PARTN_BITS;
1210 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1211 disk->queue = drive->queue;
1214 EXPORT_SYMBOL_GPL(ide_init_disk);
1216 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1218 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1220 if (drive == drive->next) {
1221 /* special case: last drive from hwgroup. */
1222 BUG_ON(hwgroup->drive != drive);
1223 hwgroup->drive = NULL;
1227 walk = hwgroup->drive;
1228 while (walk->next != drive)
1230 walk->next = drive->next;
1231 if (hwgroup->drive == drive) {
1232 hwgroup->drive = drive->next;
1233 hwgroup->hwif = hwgroup->drive->hwif;
1236 BUG_ON(hwgroup->drive == drive);
1239 static void drive_release_dev (struct device *dev)
1241 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1243 ide_proc_unregister_device(drive);
1245 spin_lock_irq(&ide_lock);
1246 ide_remove_drive_from_hwgroup(drive);
1250 /* Messed up locking ... */
1251 spin_unlock_irq(&ide_lock);
1252 blk_cleanup_queue(drive->queue);
1253 spin_lock_irq(&ide_lock);
1254 drive->queue = NULL;
1255 spin_unlock_irq(&ide_lock);
1257 complete(&drive->gendev_rel_comp);
1260 static int hwif_init(ide_hwif_t *hwif)
1265 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1267 printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
1272 if (register_blkdev(hwif->major, hwif->name))
1275 if (!hwif->sg_max_nents)
1276 hwif->sg_max_nents = PRD_ENTRIES;
1278 hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1280 if (!hwif->sg_table) {
1281 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1285 sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1287 if (init_irq(hwif) == 0)
1290 old_irq = hwif->irq;
1292 * It failed to initialise. Find the default IRQ for
1293 * this port and try that.
1295 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1297 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1298 hwif->name, old_irq);
1301 if (init_irq(hwif)) {
1302 printk(KERN_ERR "%s: probed IRQ %d and default IRQ %d failed\n",
1303 hwif->name, old_irq, hwif->irq);
1306 printk(KERN_WARNING "%s: probed IRQ %d failed, using default\n",
1307 hwif->name, hwif->irq);
1310 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1311 THIS_MODULE, ata_probe, ata_lock, hwif);
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];
1325 struct device *dev = &drive->gendev;
1328 if (!drive->present)
1331 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1332 dev->parent = &hwif->gendev;
1333 dev->bus = &ide_bus_type;
1334 dev->driver_data = drive;
1335 dev->release = drive_release_dev;
1337 ret = device_register(dev);
1339 printk(KERN_WARNING "IDE: %s: device_register error: "
1340 "%d\n", __func__, ret);
1344 static void ide_port_init_devices(ide_hwif_t *hwif)
1346 const struct ide_port_ops *port_ops = hwif->port_ops;
1349 for (i = 0; i < MAX_DRIVES; i++) {
1350 ide_drive_t *drive = &hwif->drives[i];
1352 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1353 drive->io_32bit = 1;
1354 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1356 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1357 drive->no_unmask = 1;
1359 if (port_ops && port_ops->init_dev)
1360 port_ops->init_dev(drive);
1364 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1365 const struct ide_port_info *d)
1367 hwif->channel = port;
1370 hwif->chipset = d->chipset;
1375 if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1376 (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1377 hwif->irq = port ? 15 : 14;
1379 /* ->host_flags may be set by ->init_iops (or even earlier...) */
1380 hwif->host_flags |= d->host_flags;
1381 hwif->pio_mask = d->pio_mask;
1384 hwif->tp_ops = d->tp_ops;
1386 /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1387 if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1388 hwif->port_ops = d->port_ops;
1390 hwif->swdma_mask = d->swdma_mask;
1391 hwif->mwdma_mask = d->mwdma_mask;
1392 hwif->ultra_mask = d->udma_mask;
1394 if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1398 rc = d->init_dma(hwif, d);
1400 rc = ide_hwif_setup_dma(hwif, d);
1403 printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1405 hwif->swdma_mask = 0;
1406 hwif->mwdma_mask = 0;
1407 hwif->ultra_mask = 0;
1408 } else if (d->dma_ops)
1409 hwif->dma_ops = d->dma_ops;
1412 if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1413 ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1415 hwif->mate->serialized = hwif->serialized = 1;
1418 if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1421 /* call chipset specific routine for each enabled port */
1426 static void ide_port_cable_detect(ide_hwif_t *hwif)
1428 const struct ide_port_ops *port_ops = hwif->port_ops;
1430 if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1431 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1432 hwif->cbl = port_ops->cable_detect(hwif);
1436 static ssize_t store_delete_devices(struct device *portdev,
1437 struct device_attribute *attr,
1438 const char *buf, size_t n)
1440 ide_hwif_t *hwif = dev_get_drvdata(portdev);
1442 if (strncmp(buf, "1", n))
1445 ide_port_unregister_devices(hwif);
1450 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1452 static ssize_t store_scan(struct device *portdev,
1453 struct device_attribute *attr,
1454 const char *buf, size_t n)
1456 ide_hwif_t *hwif = dev_get_drvdata(portdev);
1458 if (strncmp(buf, "1", n))
1461 ide_port_unregister_devices(hwif);
1462 ide_port_scan(hwif);
1467 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1469 static struct device_attribute *ide_port_attrs[] = {
1470 &dev_attr_delete_devices,
1475 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1477 int i, uninitialized_var(rc);
1479 for (i = 0; ide_port_attrs[i]; i++) {
1480 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1488 static unsigned int ide_indexes;
1491 * ide_find_port_slot - find free port slot
1494 * Return the new port slot index or -ENOENT if we are out of free slots.
1497 static int ide_find_port_slot(const struct ide_port_info *d)
1500 u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1501 u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1504 * Claim an unassigned slot.
1506 * Give preference to claiming other slots before claiming ide0/ide1,
1507 * just in case there's another interface yet-to-be-scanned
1508 * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1510 * Unless there is a bootable card that does not use the standard
1511 * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1513 mutex_lock(&ide_cfg_mtx);
1515 if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1516 idx = ffz(ide_indexes | i);
1518 if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1519 idx = ffz(ide_indexes | 3);
1520 else if ((ide_indexes & 3) != 3)
1521 idx = ffz(ide_indexes);
1524 ide_indexes |= (1 << idx);
1525 mutex_unlock(&ide_cfg_mtx);
1530 static void ide_free_port_slot(int idx)
1532 mutex_lock(&ide_cfg_mtx);
1533 ide_indexes &= ~(1 << idx);
1534 mutex_unlock(&ide_cfg_mtx);
1537 struct ide_host *ide_host_alloc_all(const struct ide_port_info *d,
1540 struct ide_host *host;
1543 host = kzalloc(sizeof(*host), GFP_KERNEL);
1547 for (i = 0; i < MAX_HWIFS; i++) {
1554 hwif = kzalloc(sizeof(*hwif), GFP_KERNEL);
1558 idx = ide_find_port_slot(d);
1560 printk(KERN_ERR "%s: no free slot for interface\n",
1561 d ? d->name : "ide");
1566 ide_init_port_data(hwif, idx);
1570 host->ports[i] = hwif;
1574 if (host->n_ports == 0) {
1580 host->dev[0] = hws[0]->dev;
1583 host->init_chipset = d->init_chipset;
1584 host->host_flags = d->host_flags;
1589 EXPORT_SYMBOL_GPL(ide_host_alloc_all);
1591 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1593 hw_regs_t *hws_all[MAX_HWIFS];
1596 for (i = 0; i < MAX_HWIFS; i++)
1597 hws_all[i] = (i < 4) ? hws[i] : NULL;
1599 return ide_host_alloc_all(d, hws_all);
1601 EXPORT_SYMBOL_GPL(ide_host_alloc);
1603 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1606 ide_hwif_t *hwif, *mate = NULL;
1609 for (i = 0; i < MAX_HWIFS; i++) {
1610 hwif = host->ports[i];
1617 ide_init_port_hw(hwif, hws[i]);
1618 ide_port_apply_params(hwif);
1625 if ((i & 1) && mate) {
1630 mate = (i & 1) ? NULL : hwif;
1632 ide_init_port(hwif, i & 1, d);
1633 ide_port_cable_detect(hwif);
1634 ide_port_init_devices(hwif);
1637 for (i = 0; i < MAX_HWIFS; i++) {
1638 hwif = host->ports[i];
1643 if (ide_probe_port(hwif) == 0)
1646 if (hwif->chipset != ide_4drives || !hwif->mate ||
1647 !hwif->mate->present)
1648 ide_register_port(hwif);
1651 ide_port_tune_devices(hwif);
1654 for (i = 0; i < MAX_HWIFS; i++) {
1655 hwif = host->ports[i];
1660 if (hwif_init(hwif) == 0) {
1661 printk(KERN_INFO "%s: failed to initialize IDE "
1662 "interface\n", hwif->name);
1670 ide_port_setup_devices(hwif);
1672 ide_acpi_init(hwif);
1675 ide_acpi_port_init_devices(hwif);
1678 for (i = 0; i < MAX_HWIFS; i++) {
1679 hwif = host->ports[i];
1684 if (hwif->chipset == ide_unknown)
1685 hwif->chipset = ide_generic;
1688 hwif_register_devices(hwif);
1691 for (i = 0; i < MAX_HWIFS; i++) {
1692 hwif = host->ports[i];
1697 ide_sysfs_register_port(hwif);
1698 ide_proc_register_port(hwif);
1701 ide_proc_port_register_devices(hwif);
1706 EXPORT_SYMBOL_GPL(ide_host_register);
1708 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1709 struct ide_host **hostp)
1711 struct ide_host *host;
1714 host = ide_host_alloc(d, hws);
1718 rc = ide_host_register(host, d, hws);
1720 ide_host_free(host);
1729 EXPORT_SYMBOL_GPL(ide_host_add);
1731 void ide_host_free(struct ide_host *host)
1736 for (i = 0; i < MAX_HWIFS; i++) {
1737 hwif = host->ports[i];
1742 ide_free_port_slot(hwif->index);
1748 EXPORT_SYMBOL_GPL(ide_host_free);
1750 void ide_host_remove(struct ide_host *host)
1754 for (i = 0; i < MAX_HWIFS; i++) {
1756 ide_unregister(host->ports[i]);
1759 ide_host_free(host);
1761 EXPORT_SYMBOL_GPL(ide_host_remove);
1763 void ide_port_scan(ide_hwif_t *hwif)
1765 ide_port_apply_params(hwif);
1766 ide_port_cable_detect(hwif);
1767 ide_port_init_devices(hwif);
1769 if (ide_probe_port(hwif) < 0)
1774 ide_port_tune_devices(hwif);
1775 ide_acpi_port_init_devices(hwif);
1776 ide_port_setup_devices(hwif);
1777 hwif_register_devices(hwif);
1778 ide_proc_port_register_devices(hwif);
1780 EXPORT_SYMBOL_GPL(ide_port_scan);
1782 static void ide_legacy_init_one(hw_regs_t **hws, hw_regs_t *hw,
1783 u8 port_no, const struct ide_port_info *d,
1784 unsigned long config)
1786 unsigned long base, ctl;
1799 if (!request_region(base, 8, d->name)) {
1800 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1801 d->name, base, base + 7);
1805 if (!request_region(ctl, 1, d->name)) {
1806 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1808 release_region(base, 8);
1812 ide_std_init_ports(hw, base, ctl);
1814 hw->chipset = d->chipset;
1815 hw->config = config;
1820 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1822 hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
1824 memset(&hw, 0, sizeof(hw));
1826 if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1827 ide_legacy_init_one(hws, &hw[0], 0, d, config);
1828 ide_legacy_init_one(hws, &hw[1], 1, d, config);
1830 if (hws[0] == NULL && hws[1] == NULL &&
1831 (d->host_flags & IDE_HFLAG_SINGLE))
1834 return ide_host_add(d, hws, NULL);
1836 EXPORT_SYMBOL_GPL(ide_legacy_device_add);