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>
42 static ide_hwif_t ide_hwifs[MAX_HWIFS]; /* master data repository */
45 * generic_id - add a generic drive id
46 * @drive: drive to make an ID block for
48 * Add a fake id field to the drive we are passed. This allows
49 * use to skip a ton of NULL checks (which people always miss)
50 * and make drive properties unconditional outside of this file
53 static void generic_id(ide_drive_t *drive)
55 drive->id->cyls = drive->cyl;
56 drive->id->heads = drive->head;
57 drive->id->sectors = drive->sect;
58 drive->id->cur_cyls = drive->cyl;
59 drive->id->cur_heads = drive->head;
60 drive->id->cur_sectors = drive->sect;
63 static void ide_disk_init_chs(ide_drive_t *drive)
65 struct hd_driveid *id = drive->id;
67 /* Extract geometry if we did not already have one for the drive */
68 if (!drive->cyl || !drive->head || !drive->sect) {
69 drive->cyl = drive->bios_cyl = id->cyls;
70 drive->head = drive->bios_head = id->heads;
71 drive->sect = drive->bios_sect = id->sectors;
74 /* Handle logical geometry translation by the drive */
75 if ((id->field_valid & 1) && id->cur_cyls &&
76 id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
77 drive->cyl = id->cur_cyls;
78 drive->head = id->cur_heads;
79 drive->sect = id->cur_sectors;
82 /* Use physical geometry if what we have still makes no sense */
83 if (drive->head > 16 && id->heads && id->heads <= 16) {
84 drive->cyl = id->cyls;
85 drive->head = id->heads;
86 drive->sect = id->sectors;
90 static void ide_disk_init_mult_count(ide_drive_t *drive)
92 struct hd_driveid *id = drive->id;
94 drive->mult_count = 0;
95 if (id->max_multsect) {
96 #ifdef CONFIG_IDEDISK_MULTI_MODE
97 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
98 id->multsect_valid = id->multsect ? 1 : 0;
99 drive->mult_req = id->multsect_valid ? id->max_multsect : 0;
100 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
101 #else /* original, pre IDE-NFG, per request of AC */
103 if (drive->mult_req > id->max_multsect)
104 drive->mult_req = id->max_multsect;
105 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
106 drive->special.b.set_multmode = 1;
112 * do_identify - identify a drive
113 * @drive: drive to identify
116 * Called when we have issued a drive identify command to
117 * read and parse the results. This function is run with
118 * interrupts disabled.
121 static inline void do_identify (ide_drive_t *drive, u8 cmd)
123 ide_hwif_t *hwif = HWIF(drive);
125 struct hd_driveid *id;
128 /* read 512 bytes of id info */
129 hwif->input_data(drive, NULL, id, SECTOR_SIZE);
134 printk(KERN_INFO "%s: dumping identify data\n", drive->name);
135 ide_dump_identify((u8 *)id);
139 #if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
141 * EATA SCSI controllers do a hardware ATA emulation:
142 * Ignore them if there is a driver for them available.
144 if ((id->model[0] == 'P' && id->model[1] == 'M') ||
145 (id->model[0] == 'S' && id->model[1] == 'K')) {
146 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
149 #endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
152 * WIN_IDENTIFY returns little-endian info,
153 * WIN_PIDENTIFY *usually* returns little-endian info.
155 if (cmd == WIN_PIDENTIFY) {
156 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
157 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
158 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
159 /* Vertos drives may still be weird */
162 ide_fixstring(id->model, sizeof(id->model), bswap);
163 ide_fixstring(id->fw_rev, sizeof(id->fw_rev), bswap);
164 ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
166 /* we depend on this a lot! */
167 id->model[sizeof(id->model)-1] = '\0';
169 if (strstr(id->model, "E X A B Y T E N E S T"))
172 printk("%s: %s, ", drive->name, id->model);
177 * Check for an ATAPI device
179 if (cmd == WIN_PIDENTIFY) {
180 u8 type = (id->config >> 8) & 0x1f;
184 if (!strstr(id->model, "CD-ROM")) {
185 if (!strstr(id->model, "oppy") &&
186 !strstr(id->model, "poyp") &&
187 !strstr(id->model, "ZIP"))
188 printk("cdrom or floppy?, assuming ");
189 if (drive->media != ide_cdrom) {
191 drive->removable = 1;
195 /* Early cdrom models used zero */
198 drive->removable = 1;
200 /* kludge for Apple PowerBook internal zip */
201 if (!strstr(id->model, "CD-ROM") &&
202 strstr(id->model, "ZIP")) {
208 printk ("CD/DVD-ROM");
215 drive->removable = 1;
218 printk("UNKNOWN (type %d)", type);
223 /* an ATAPI device ignores DRDY */
224 drive->ready_stat = 0;
229 * Not an ATAPI device: looks like a "regular" hard disk
233 * 0x848a = CompactFlash device
234 * These are *not* removable in Linux definition of the term
237 if ((id->config != 0x848a) && (id->config & (1<<7)))
238 drive->removable = 1;
240 drive->media = ide_disk;
241 printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
252 * actual_try_to_identify - send ata/atapi identify
253 * @drive: drive to identify
254 * @cmd: command to use
256 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
257 * and waits for a response. It also monitors irqs while this is
258 * happening, in hope of automatically determining which one is
259 * being used by the interface.
261 * Returns: 0 device was identified
262 * 1 device timed-out (no response to identify request)
263 * 2 device aborted the command (refused to identify itself)
266 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
268 ide_hwif_t *hwif = HWIF(drive);
269 struct ide_io_ports *io_ports = &hwif->io_ports;
270 int use_altstatus = 0, rc;
271 unsigned long timeout;
274 /* take a deep breath */
277 if (io_ports->ctl_addr) {
278 a = hwif->read_altstatus(hwif);
279 s = hwif->read_status(hwif);
280 if ((a ^ s) & ~INDEX_STAT)
281 /* ancient Seagate drives, broken interfaces */
282 printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
283 "instead of ALTSTATUS(0x%02x)\n",
286 /* use non-intrusive polling */
290 /* set features register for atapi
291 * identify command to be sure of reply
293 if (cmd == WIN_PIDENTIFY) {
296 memset(&task, 0, sizeof(task));
297 /* disable DMA & overlap */
298 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
300 drive->hwif->tf_load(drive, &task);
303 /* ask drive for ID */
304 hwif->exec_command(hwif, cmd);
306 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
309 if (time_after(jiffies, timeout)) {
310 /* drive timed-out */
313 /* give drive a breather */
315 s = use_altstatus ? hwif->read_altstatus(hwif)
316 : hwif->read_status(hwif);
317 } while (s & BUSY_STAT);
319 /* wait for IRQ and DRQ_STAT */
321 s = hwif->read_status(hwif);
323 if (OK_STAT(s, DRQ_STAT, BAD_R_STAT)) {
326 /* local CPU only; some systems need this */
327 local_irq_save(flags);
328 /* drive returned ID */
329 do_identify(drive, cmd);
330 /* drive responded with ID */
332 /* clear drive IRQ */
333 (void)hwif->read_status(hwif);
334 local_irq_restore(flags);
336 /* drive refused ID */
343 * try_to_identify - try to identify a drive
344 * @drive: drive to probe
345 * @cmd: command to use
347 * Issue the identify command and then do IRQ probing to
348 * complete the identification when needed by finding the
349 * IRQ the drive is attached to
352 static int try_to_identify (ide_drive_t *drive, u8 cmd)
354 ide_hwif_t *hwif = HWIF(drive);
357 unsigned long cookie = 0;
360 * Disable device irq unless we need to
361 * probe for it. Otherwise we'll get spurious
362 * interrupts during the identify-phase that
363 * the irq handler isn't expecting.
365 if (hwif->io_ports.ctl_addr) {
368 cookie = probe_irq_on();
370 hwif->set_irq(hwif, autoprobe);
373 retval = actual_try_to_identify(drive, cmd);
378 hwif->set_irq(hwif, 0);
379 /* clear drive IRQ */
380 (void)hwif->read_status(hwif);
382 irq = probe_irq_off(cookie);
387 /* Mmmm.. multiple IRQs..
388 * don't know which was ours
390 printk("%s: IRQ probe failed (0x%lx)\n",
391 drive->name, cookie);
398 static int ide_busy_sleep(ide_hwif_t *hwif)
400 unsigned long timeout = jiffies + WAIT_WORSTCASE;
405 stat = hwif->read_status(hwif);
406 if ((stat & BUSY_STAT) == 0)
408 } while (time_before(jiffies, timeout));
413 static u8 ide_read_device(ide_drive_t *drive)
417 memset(&task, 0, sizeof(task));
418 task.tf_flags = IDE_TFLAG_IN_DEVICE;
420 drive->hwif->tf_read(drive, &task);
422 return task.tf.device;
426 * do_probe - probe an IDE device
427 * @drive: drive to probe
428 * @cmd: command to use
430 * do_probe() has the difficult job of finding a drive if it exists,
431 * without getting hung up if it doesn't exist, without trampling on
432 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
434 * If a drive is "known" to exist (from CMOS or kernel parameters),
435 * but does not respond right away, the probe will "hang in there"
436 * for the maximum wait time (about 30 seconds), otherwise it will
437 * exit much more quickly.
439 * Returns: 0 device was identified
440 * 1 device timed-out (no response to identify request)
441 * 2 device aborted the command (refused to identify itself)
442 * 3 bad status from device (possible for ATAPI drives)
443 * 4 probe was not attempted because failure was obvious
446 static int do_probe (ide_drive_t *drive, u8 cmd)
448 ide_hwif_t *hwif = HWIF(drive);
452 if (drive->present) {
453 /* avoid waiting for inappropriate probes */
454 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
458 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
459 drive->name, drive->present, drive->media,
460 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
463 /* needed for some systems
464 * (e.g. crw9624 as drive0 with disk as slave)
470 if (ide_read_device(drive) != drive->select.all && !drive->present) {
471 if (drive->select.b.unit != 0) {
472 /* exit with drive0 selected */
473 SELECT_DRIVE(&hwif->drives[0]);
474 /* allow BUSY_STAT to assert & clear */
477 /* no i/f present: mmm.. this should be a 4 -ml */
481 stat = hwif->read_status(hwif);
483 if (OK_STAT(stat, READY_STAT, BUSY_STAT) ||
484 drive->present || cmd == WIN_PIDENTIFY) {
485 /* send cmd and wait */
486 if ((rc = try_to_identify(drive, cmd))) {
487 /* failed: try again */
488 rc = try_to_identify(drive,cmd);
491 stat = hwif->read_status(hwif);
493 if (stat == (BUSY_STAT | READY_STAT))
496 if (rc == 1 && cmd == WIN_PIDENTIFY) {
497 printk(KERN_ERR "%s: no response (status = 0x%02x), "
498 "resetting drive\n", drive->name, stat);
502 hwif->exec_command(hwif, WIN_SRST);
503 (void)ide_busy_sleep(hwif);
504 rc = try_to_identify(drive, cmd);
507 /* ensure drive IRQ is clear */
508 stat = hwif->read_status(hwif);
511 printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
514 /* not present or maybe ATAPI */
517 if (drive->select.b.unit != 0) {
518 /* exit with drive0 selected */
519 SELECT_DRIVE(&hwif->drives[0]);
521 /* ensure drive irq is clear */
522 (void)hwif->read_status(hwif);
530 static void enable_nest (ide_drive_t *drive)
532 ide_hwif_t *hwif = HWIF(drive);
535 printk("%s: enabling %s -- ", hwif->name, drive->id->model);
538 hwif->exec_command(hwif, EXABYTE_ENABLE_NEST);
540 if (ide_busy_sleep(hwif)) {
541 printk(KERN_CONT "failed (timeout)\n");
547 stat = hwif->read_status(hwif);
549 if (!OK_STAT(stat, 0, BAD_STAT))
550 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
552 printk(KERN_CONT "success\n");
554 /* if !(success||timed-out) */
555 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
556 /* look for ATAPI device */
557 (void) do_probe(drive, WIN_PIDENTIFY);
562 * probe_for_drives - upper level drive probe
563 * @drive: drive to probe for
565 * probe_for_drive() tests for existence of a given drive using do_probe()
566 * and presents things to the user as needed.
568 * Returns: 0 no device was found
569 * 1 device was found (note: drive->present might
573 static inline u8 probe_for_drive (ide_drive_t *drive)
576 * In order to keep things simple we have an id
577 * block for all drives at all times. If the device
578 * is pre ATA or refuses ATA/ATAPI identify we
579 * will add faked data to this.
581 * Also note that 0 everywhere means "can't do X"
584 drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
586 if(drive->id == NULL)
588 printk(KERN_ERR "ide: out of memory for id data.\n");
591 strcpy(drive->id->model, "UNKNOWN");
596 /* if !(success||timed-out) */
597 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
598 /* look for ATAPI device */
599 (void) do_probe(drive, WIN_PIDENTIFY);
602 /* drive not found */
604 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
607 /* identification failed? */
608 if (!drive->id_read) {
609 if (drive->media == ide_disk) {
610 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
611 drive->name, drive->cyl,
612 drive->head, drive->sect);
613 } else if (drive->media == ide_cdrom) {
614 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
617 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
621 /* drive was found */
625 /* The drive wasn't being helpful. Add generic info only */
626 if (drive->id_read == 0) {
631 if (drive->media == ide_disk) {
632 ide_disk_init_chs(drive);
633 ide_disk_init_mult_count(drive);
636 return drive->present;
639 static void hwif_release_dev (struct device *dev)
641 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
643 complete(&hwif->gendev_rel_comp);
646 static int ide_register_port(ide_hwif_t *hwif)
650 /* register with global device tree */
651 strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
652 hwif->gendev.driver_data = hwif;
653 if (hwif->gendev.parent == NULL) {
655 hwif->gendev.parent = hwif->dev;
657 /* Would like to do = &device_legacy */
658 hwif->gendev.parent = NULL;
660 hwif->gendev.release = hwif_release_dev;
661 ret = device_register(&hwif->gendev);
663 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
668 hwif->portdev = device_create_drvdata(ide_port_class, &hwif->gendev,
669 MKDEV(0, 0), hwif, hwif->name);
670 if (IS_ERR(hwif->portdev)) {
671 ret = PTR_ERR(hwif->portdev);
672 device_unregister(&hwif->gendev);
679 * ide_port_wait_ready - wait for port to become ready
682 * This is needed on some PPCs and a bunch of BIOS-less embedded
683 * platforms. Typical cases are:
685 * - The firmware hard reset the disk before booting the kernel,
686 * the drive is still doing it's poweron-reset sequence, that
687 * can take up to 30 seconds.
689 * - The firmware does nothing (or no firmware), the device is
690 * still in POST state (same as above actually).
692 * - Some CD/DVD/Writer combo drives tend to drive the bus during
693 * their reset sequence even when they are non-selected slave
694 * devices, thus preventing discovery of the main HD.
696 * Doing this wait-for-non-busy should not harm any existing
697 * configuration and fix some issues like the above.
701 * Returns 0 on success, error code (< 0) otherwise.
704 static int ide_port_wait_ready(ide_hwif_t *hwif)
708 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
710 /* Let HW settle down a bit from whatever init state we
714 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
715 * I know of at least one disk who takes 31 seconds, I use 35
718 rc = ide_wait_not_busy(hwif, 35000);
722 /* Now make sure both master & slave are ready */
723 for (unit = 0; unit < MAX_DRIVES; unit++) {
724 ide_drive_t *drive = &hwif->drives[unit];
726 /* Ignore disks that we will not probe for later. */
727 if (!drive->noprobe || drive->present) {
729 hwif->set_irq(hwif, 1);
731 rc = ide_wait_not_busy(hwif, 35000);
735 printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
739 /* Exit function with master reselected (let's be sane) */
741 SELECT_DRIVE(&hwif->drives[0]);
747 * ide_undecoded_slave - look for bad CF adapters
750 * Analyse the drives on the interface and attempt to decide if we
751 * have the same drive viewed twice. This occurs with crap CF adapters
752 * and PCMCIA sometimes.
755 void ide_undecoded_slave(ide_drive_t *drive1)
757 ide_drive_t *drive0 = &drive1->hwif->drives[0];
759 if ((drive1->dn & 1) == 0 || drive0->present == 0)
762 /* If the models don't match they are not the same product */
763 if (strcmp(drive0->id->model, drive1->id->model))
766 /* Serial numbers do not match */
767 if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
770 /* No serial number, thankfully very rare for CF */
771 if (drive0->id->serial_no[0] == 0)
774 /* Appears to be an IDE flash adapter with decode bugs */
775 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
780 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
782 static int ide_probe_port(ide_hwif_t *hwif)
786 int unit, rc = -ENODEV;
788 BUG_ON(hwif->present);
790 if (hwif->drives[0].noprobe && hwif->drives[1].noprobe)
794 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
795 * we'll install our IRQ driver much later...
799 disable_irq(hwif->irq);
801 local_irq_set(flags);
803 if (ide_port_wait_ready(hwif) == -EBUSY)
804 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
807 * Second drive should only exist if first drive was found,
808 * but a lot of cdrom drives are configured as single slaves.
810 for (unit = 0; unit < MAX_DRIVES; ++unit) {
811 ide_drive_t *drive = &hwif->drives[unit];
812 drive->dn = (hwif->channel ? 2 : 0) + unit;
813 (void) probe_for_drive(drive);
818 local_irq_restore(flags);
821 * Use cached IRQ number. It might be (and is...) changed by probe
830 static void ide_port_tune_devices(ide_hwif_t *hwif)
832 const struct ide_port_ops *port_ops = hwif->port_ops;
835 for (unit = 0; unit < MAX_DRIVES; unit++) {
836 ide_drive_t *drive = &hwif->drives[unit];
838 if (drive->present && port_ops && port_ops->quirkproc)
839 port_ops->quirkproc(drive);
842 for (unit = 0; unit < MAX_DRIVES; ++unit) {
843 ide_drive_t *drive = &hwif->drives[unit];
845 if (drive->present) {
846 ide_set_max_pio(drive);
855 for (unit = 0; unit < MAX_DRIVES; ++unit) {
856 ide_drive_t *drive = &hwif->drives[unit];
858 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
859 drive->no_io_32bit = 1;
861 drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
867 * save_match() is used to simplify logic in init_irq() below.
869 * A loophole here is that we may not know about a particular
870 * hwif's irq until after that hwif is actually probed/initialized..
871 * This could be a problem for the case where an hwif is on a
872 * dual interface that requires serialization (eg. cmd640) and another
873 * hwif using one of the same irqs is initialized beforehand.
875 * This routine detects and reports such situations, but does not fix them.
877 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
879 ide_hwif_t *m = *match;
881 if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
884 printk("%s: potential irq problem with %s and %s\n",
885 hwif->name, new->name, m->name);
887 if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
890 #endif /* MAX_HWIFS > 1 */
895 static int ide_init_queue(ide_drive_t *drive)
897 struct request_queue *q;
898 ide_hwif_t *hwif = HWIF(drive);
899 int max_sectors = 256;
900 int max_sg_entries = PRD_ENTRIES;
903 * Our default set up assumes the normal IDE case,
904 * that is 64K segmenting, standard PRD setup
905 * and LBA28. Some drivers then impose their own
906 * limits and LBA48 we could raise it but as yet
910 q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
914 q->queuedata = drive;
915 blk_queue_segment_boundary(q, 0xffff);
917 if (hwif->rqsize < max_sectors)
918 max_sectors = hwif->rqsize;
919 blk_queue_max_sectors(q, max_sectors);
922 /* When we have an IOMMU, we may have a problem where pci_map_sg()
923 * creates segments that don't completely match our boundary
924 * requirements and thus need to be broken up again. Because it
925 * doesn't align properly either, we may actually have to break up
926 * to more segments than what was we got in the first place, a max
927 * worst case is twice as many.
928 * This will be fixed once we teach pci_map_sg() about our boundary
929 * requirements, hopefully soon. *FIXME*
931 if (!PCI_DMA_BUS_IS_PHYS)
932 max_sg_entries >>= 1;
933 #endif /* CONFIG_PCI */
935 blk_queue_max_hw_segments(q, max_sg_entries);
936 blk_queue_max_phys_segments(q, max_sg_entries);
938 /* assign drive queue */
941 /* needs drive->queue to be set */
942 ide_toggle_bounce(drive, 1);
947 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
949 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
951 spin_lock_irq(&ide_lock);
952 if (!hwgroup->drive) {
953 /* first drive for hwgroup. */
955 hwgroup->drive = drive;
956 hwgroup->hwif = HWIF(hwgroup->drive);
958 drive->next = hwgroup->drive->next;
959 hwgroup->drive->next = drive;
961 spin_unlock_irq(&ide_lock);
965 * For any present drive:
966 * - allocate the block device queue
967 * - link drive into the hwgroup
969 static void ide_port_setup_devices(ide_hwif_t *hwif)
973 mutex_lock(&ide_cfg_mtx);
974 for (i = 0; i < MAX_DRIVES; i++) {
975 ide_drive_t *drive = &hwif->drives[i];
980 if (ide_init_queue(drive)) {
981 printk(KERN_ERR "ide: failed to init %s\n",
986 ide_add_drive_to_hwgroup(drive);
988 mutex_unlock(&ide_cfg_mtx);
992 * This routine sets up the irq for an ide interface, and creates a new
993 * hwgroup for the irq/hwif if none was previously assigned.
995 * Much of the code is for correctly detecting/handling irq sharing
996 * and irq serialization situations. This is somewhat complex because
997 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
999 static int init_irq (ide_hwif_t *hwif)
1001 struct ide_io_ports *io_ports = &hwif->io_ports;
1003 ide_hwgroup_t *hwgroup;
1004 ide_hwif_t *match = NULL;
1007 BUG_ON(in_interrupt());
1008 BUG_ON(irqs_disabled());
1009 BUG_ON(hwif == NULL);
1011 mutex_lock(&ide_cfg_mtx);
1012 hwif->hwgroup = NULL;
1015 * Group up with any other hwifs that share our irq(s).
1017 for (index = 0; index < MAX_HWIFS; index++) {
1018 ide_hwif_t *h = &ide_hwifs[index];
1019 if (h->hwgroup) { /* scan only initialized hwif's */
1020 if (hwif->irq == h->irq) {
1021 hwif->sharing_irq = h->sharing_irq = 1;
1022 if (hwif->chipset != ide_pci ||
1023 h->chipset != ide_pci) {
1024 save_match(hwif, h, &match);
1027 if (hwif->serialized) {
1028 if (hwif->mate && hwif->mate->irq == h->irq)
1029 save_match(hwif, h, &match);
1031 if (h->serialized) {
1032 if (h->mate && hwif->irq == h->mate->irq)
1033 save_match(hwif, h, &match);
1037 #endif /* MAX_HWIFS > 1 */
1039 * If we are still without a hwgroup, then form a new one
1042 hwgroup = match->hwgroup;
1043 hwif->hwgroup = hwgroup;
1045 * Link us into the hwgroup.
1046 * This must be done early, do ensure that unexpected_intr
1047 * can find the hwif and prevent irq storms.
1048 * No drives are attached to the new hwif, choose_drive
1049 * can't do anything stupid (yet).
1050 * Add ourself as the 2nd entry to the hwgroup->hwif
1051 * linked list, the first entry is the hwif that owns
1052 * hwgroup->handler - do not change that.
1054 spin_lock_irq(&ide_lock);
1055 hwif->next = hwgroup->hwif->next;
1056 hwgroup->hwif->next = hwif;
1057 BUG_ON(hwif->next == hwif);
1058 spin_unlock_irq(&ide_lock);
1060 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1061 hwif_to_node(hwif));
1062 if (hwgroup == NULL)
1065 hwif->hwgroup = hwgroup;
1066 hwgroup->hwif = hwif->next = hwif;
1068 init_timer(&hwgroup->timer);
1069 hwgroup->timer.function = &ide_timer_expiry;
1070 hwgroup->timer.data = (unsigned long) hwgroup;
1074 * Allocate the irq, if not already obtained for another hwif
1076 if (!match || match->irq != hwif->irq) {
1078 #if defined(__mc68000__)
1080 #endif /* __mc68000__ */
1082 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1085 if (io_ports->ctl_addr)
1086 hwif->set_irq(hwif, 1);
1088 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1092 if (!hwif->rqsize) {
1093 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1094 (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1097 hwif->rqsize = 65536;
1100 #if !defined(__mc68000__)
1101 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1102 io_ports->data_addr, io_ports->status_addr,
1103 io_ports->ctl_addr, hwif->irq);
1105 printk("%s at 0x%08lx on irq %d", hwif->name,
1106 io_ports->data_addr, hwif->irq);
1107 #endif /* __mc68000__ */
1109 printk(" (%sed with %s)",
1110 hwif->sharing_irq ? "shar" : "serializ", match->name);
1113 mutex_unlock(&ide_cfg_mtx);
1116 ide_remove_port_from_hwgroup(hwif);
1118 mutex_unlock(&ide_cfg_mtx);
1122 static int ata_lock(dev_t dev, void *data)
1124 /* FIXME: we want to pin hwif down */
1128 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1130 ide_hwif_t *hwif = data;
1131 int unit = *part >> PARTN_BITS;
1132 ide_drive_t *drive = &hwif->drives[unit];
1133 if (!drive->present)
1136 if (drive->media == ide_disk)
1137 request_module("ide-disk");
1139 request_module("ide-scsi");
1140 if (drive->media == ide_cdrom || drive->media == ide_optical)
1141 request_module("ide-cd");
1142 if (drive->media == ide_tape)
1143 request_module("ide-tape");
1144 if (drive->media == ide_floppy)
1145 request_module("ide-floppy");
1150 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1152 struct gendisk *p = data;
1153 *part &= (1 << PARTN_BITS) - 1;
1154 return &p->dev.kobj;
1157 static int exact_lock(dev_t dev, void *data)
1159 struct gendisk *p = data;
1166 void ide_register_region(struct gendisk *disk)
1168 blk_register_region(MKDEV(disk->major, disk->first_minor),
1169 disk->minors, NULL, exact_match, exact_lock, disk);
1172 EXPORT_SYMBOL_GPL(ide_register_region);
1174 void ide_unregister_region(struct gendisk *disk)
1176 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1180 EXPORT_SYMBOL_GPL(ide_unregister_region);
1182 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1184 ide_hwif_t *hwif = drive->hwif;
1185 unsigned int unit = (drive->select.all >> 4) & 1;
1187 disk->major = hwif->major;
1188 disk->first_minor = unit << PARTN_BITS;
1189 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1190 disk->queue = drive->queue;
1193 EXPORT_SYMBOL_GPL(ide_init_disk);
1195 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1197 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1199 if (drive == drive->next) {
1200 /* special case: last drive from hwgroup. */
1201 BUG_ON(hwgroup->drive != drive);
1202 hwgroup->drive = NULL;
1206 walk = hwgroup->drive;
1207 while (walk->next != drive)
1209 walk->next = drive->next;
1210 if (hwgroup->drive == drive) {
1211 hwgroup->drive = drive->next;
1212 hwgroup->hwif = hwgroup->drive->hwif;
1215 BUG_ON(hwgroup->drive == drive);
1218 static void drive_release_dev (struct device *dev)
1220 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1222 ide_proc_unregister_device(drive);
1224 spin_lock_irq(&ide_lock);
1225 ide_remove_drive_from_hwgroup(drive);
1229 /* Messed up locking ... */
1230 spin_unlock_irq(&ide_lock);
1231 blk_cleanup_queue(drive->queue);
1232 spin_lock_irq(&ide_lock);
1233 drive->queue = NULL;
1234 spin_unlock_irq(&ide_lock);
1236 complete(&drive->gendev_rel_comp);
1239 static int hwif_init(ide_hwif_t *hwif)
1244 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1246 printk("%s: DISABLED, NO IRQ\n", hwif->name);
1251 if (register_blkdev(hwif->major, hwif->name))
1254 if (!hwif->sg_max_nents)
1255 hwif->sg_max_nents = PRD_ENTRIES;
1257 hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1259 if (!hwif->sg_table) {
1260 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1264 sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1266 if (init_irq(hwif) == 0)
1269 old_irq = hwif->irq;
1271 * It failed to initialise. Find the default IRQ for
1272 * this port and try that.
1274 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1276 printk("%s: Disabled unable to get IRQ %d.\n",
1277 hwif->name, old_irq);
1280 if (init_irq(hwif)) {
1281 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1282 hwif->name, old_irq, hwif->irq);
1285 printk("%s: probed IRQ %d failed, using default.\n",
1286 hwif->name, hwif->irq);
1289 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1290 THIS_MODULE, ata_probe, ata_lock, hwif);
1294 unregister_blkdev(hwif->major, hwif->name);
1298 static void hwif_register_devices(ide_hwif_t *hwif)
1302 for (i = 0; i < MAX_DRIVES; i++) {
1303 ide_drive_t *drive = &hwif->drives[i];
1304 struct device *dev = &drive->gendev;
1307 if (!drive->present)
1310 ide_add_generic_settings(drive);
1312 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1313 dev->parent = &hwif->gendev;
1314 dev->bus = &ide_bus_type;
1315 dev->driver_data = drive;
1316 dev->release = drive_release_dev;
1318 ret = device_register(dev);
1320 printk(KERN_WARNING "IDE: %s: device_register error: "
1321 "%d\n", __func__, ret);
1325 static void ide_port_init_devices(ide_hwif_t *hwif)
1327 const struct ide_port_ops *port_ops = hwif->port_ops;
1330 for (i = 0; i < MAX_DRIVES; i++) {
1331 ide_drive_t *drive = &hwif->drives[i];
1333 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1334 drive->io_32bit = 1;
1335 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1337 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1338 drive->no_unmask = 1;
1340 if (port_ops && port_ops->init_dev)
1341 port_ops->init_dev(drive);
1345 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1346 const struct ide_port_info *d)
1348 hwif->channel = port;
1351 hwif->chipset = d->chipset;
1356 if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1357 (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1358 hwif->irq = port ? 15 : 14;
1360 /* ->host_flags may be set by ->init_iops (or even earlier...) */
1361 hwif->host_flags |= d->host_flags;
1362 hwif->pio_mask = d->pio_mask;
1364 /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1365 if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1366 hwif->port_ops = d->port_ops;
1368 hwif->swdma_mask = d->swdma_mask;
1369 hwif->mwdma_mask = d->mwdma_mask;
1370 hwif->ultra_mask = d->udma_mask;
1372 if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1376 rc = d->init_dma(hwif, d);
1378 rc = ide_hwif_setup_dma(hwif, d);
1381 printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1383 hwif->swdma_mask = 0;
1384 hwif->mwdma_mask = 0;
1385 hwif->ultra_mask = 0;
1386 } else if (d->dma_ops)
1387 hwif->dma_ops = d->dma_ops;
1390 if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1391 ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1393 hwif->mate->serialized = hwif->serialized = 1;
1396 if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1399 /* call chipset specific routine for each enabled port */
1404 static void ide_port_cable_detect(ide_hwif_t *hwif)
1406 const struct ide_port_ops *port_ops = hwif->port_ops;
1408 if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1409 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1410 hwif->cbl = port_ops->cable_detect(hwif);
1414 static ssize_t store_delete_devices(struct device *portdev,
1415 struct device_attribute *attr,
1416 const char *buf, size_t n)
1418 ide_hwif_t *hwif = dev_get_drvdata(portdev);
1420 if (strncmp(buf, "1", n))
1423 ide_port_unregister_devices(hwif);
1428 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1430 static ssize_t store_scan(struct device *portdev,
1431 struct device_attribute *attr,
1432 const char *buf, size_t n)
1434 ide_hwif_t *hwif = dev_get_drvdata(portdev);
1436 if (strncmp(buf, "1", n))
1439 ide_port_unregister_devices(hwif);
1440 ide_port_scan(hwif);
1445 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1447 static struct device_attribute *ide_port_attrs[] = {
1448 &dev_attr_delete_devices,
1453 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1457 for (i = 0; ide_port_attrs[i]; i++) {
1458 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1467 * ide_find_port_slot - find free ide_hwifs[] slot
1470 * Return the new hwif. If we are out of free slots return NULL.
1473 ide_hwif_t *ide_find_port_slot(const struct ide_port_info *d)
1477 u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1480 * Claim an unassigned slot.
1482 * Give preference to claiming other slots before claiming ide0/ide1,
1483 * just in case there's another interface yet-to-be-scanned
1484 * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1486 * Unless there is a bootable card that does not use the standard
1487 * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1490 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;
1492 for (; i < MAX_HWIFS; i++) {
1493 hwif = &ide_hwifs[i];
1494 if (hwif->chipset == ide_unknown)
1498 for (i = 2; i < MAX_HWIFS; i++) {
1499 hwif = &ide_hwifs[i];
1500 if (hwif->chipset == ide_unknown)
1503 for (i = 0; i < 2 && i < MAX_HWIFS; i++) {
1504 hwif = &ide_hwifs[i];
1505 if (hwif->chipset == ide_unknown)
1510 printk(KERN_ERR "%s: no free slot for interface\n",
1511 d ? d->name : "ide");
1516 ide_init_port_data(hwif, i);
1519 EXPORT_SYMBOL_GPL(ide_find_port_slot);
1521 int ide_device_add_all(u8 *idx, const struct ide_port_info *d, hw_regs_t **hws)
1523 ide_hwif_t *hwif, *mate = NULL;
1526 for (i = 0; i < MAX_HWIFS; i++) {
1527 if (idx[i] == 0xff) {
1532 hwif = &ide_hwifs[idx[i]];
1534 ide_init_port_hw(hwif, hws[i]);
1535 ide_port_apply_params(hwif);
1542 if ((i & 1) && mate) {
1547 mate = (i & 1) ? NULL : hwif;
1549 ide_init_port(hwif, i & 1, d);
1550 ide_port_cable_detect(hwif);
1551 ide_port_init_devices(hwif);
1554 for (i = 0; i < MAX_HWIFS; i++) {
1558 hwif = &ide_hwifs[idx[i]];
1560 if (ide_probe_port(hwif) == 0)
1563 if (hwif->chipset != ide_4drives || !hwif->mate ||
1564 !hwif->mate->present)
1565 ide_register_port(hwif);
1568 ide_port_tune_devices(hwif);
1571 for (i = 0; i < MAX_HWIFS; i++) {
1575 hwif = &ide_hwifs[idx[i]];
1577 if (hwif_init(hwif) == 0) {
1578 printk(KERN_INFO "%s: failed to initialize IDE "
1579 "interface\n", hwif->name);
1586 ide_port_setup_devices(hwif);
1588 ide_acpi_init(hwif);
1591 ide_acpi_port_init_devices(hwif);
1594 for (i = 0; i < MAX_HWIFS; i++) {
1598 hwif = &ide_hwifs[idx[i]];
1600 if (hwif->chipset == ide_unknown)
1601 hwif->chipset = ide_generic;
1604 hwif_register_devices(hwif);
1607 for (i = 0; i < MAX_HWIFS; i++) {
1611 hwif = &ide_hwifs[idx[i]];
1613 ide_sysfs_register_port(hwif);
1614 ide_proc_register_port(hwif);
1617 ide_proc_port_register_devices(hwif);
1622 EXPORT_SYMBOL_GPL(ide_device_add_all);
1624 int ide_device_add(u8 *idx, const struct ide_port_info *d, hw_regs_t **hws)
1626 hw_regs_t *hws_all[MAX_HWIFS];
1627 u8 idx_all[MAX_HWIFS];
1630 for (i = 0; i < MAX_HWIFS; i++) {
1631 hws_all[i] = (i < 4) ? hws[i] : NULL;
1632 idx_all[i] = (i < 4) ? idx[i] : 0xff;
1635 return ide_device_add_all(idx_all, d, hws_all);
1637 EXPORT_SYMBOL_GPL(ide_device_add);
1639 void ide_port_scan(ide_hwif_t *hwif)
1641 ide_port_apply_params(hwif);
1642 ide_port_cable_detect(hwif);
1643 ide_port_init_devices(hwif);
1645 if (ide_probe_port(hwif) < 0)
1650 ide_port_tune_devices(hwif);
1651 ide_acpi_port_init_devices(hwif);
1652 ide_port_setup_devices(hwif);
1653 hwif_register_devices(hwif);
1654 ide_proc_port_register_devices(hwif);
1656 EXPORT_SYMBOL_GPL(ide_port_scan);
1658 static void ide_legacy_init_one(u8 *idx, hw_regs_t **hws, hw_regs_t *hw,
1659 u8 port_no, const struct ide_port_info *d,
1660 unsigned long config)
1663 unsigned long base, ctl;
1676 if (!request_region(base, 8, d->name)) {
1677 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1678 d->name, base, base + 7);
1682 if (!request_region(ctl, 1, d->name)) {
1683 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1685 release_region(base, 8);
1689 ide_std_init_ports(hw, base, ctl);
1691 hw->chipset = d->chipset;
1692 hw->config = config;
1694 hwif = ide_find_port_slot(d);
1696 hwif->chipset = hw->chipset;
1699 idx[port_no] = hwif->index;
1703 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1705 u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
1706 hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
1708 memset(&hw, 0, sizeof(hw));
1710 if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1711 ide_legacy_init_one(idx, hws, &hw[0], 0, d, config);
1712 ide_legacy_init_one(idx, hws, &hw[1], 1, d, config);
1714 if (idx[0] == 0xff && idx[1] == 0xff &&
1715 (d->host_flags & IDE_HFLAG_SINGLE))
1718 ide_device_add(idx, d, hws);
1722 EXPORT_SYMBOL_GPL(ide_legacy_device_add);