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;
104 static void ide_classify_ata_dev(ide_drive_t *drive)
107 char *m = (char *)&id[ATA_ID_PROD];
108 int is_cfa = ata_id_is_cfa(id);
110 /* CF devices are *not* removable in Linux definition of the term */
111 if (is_cfa == 0 && (id[ATA_ID_CONFIG] & (1 << 7)))
112 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
114 drive->media = ide_disk;
116 if (!ata_id_has_unload(drive->id))
117 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
119 printk(KERN_INFO "%s: %s, %s DISK drive\n", drive->name, m,
120 is_cfa ? "CFA" : "ATA");
123 static void ide_classify_atapi_dev(ide_drive_t *drive)
126 char *m = (char *)&id[ATA_ID_PROD];
127 u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;
129 printk(KERN_INFO "%s: %s, ATAPI ", drive->name, m);
132 if (!strstr(m, "CD-ROM")) {
133 if (!strstr(m, "oppy") &&
134 !strstr(m, "poyp") &&
136 printk(KERN_CONT "cdrom or floppy?, assuming ");
137 if (drive->media != ide_cdrom) {
138 printk(KERN_CONT "FLOPPY");
139 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
143 /* Early cdrom models used zero */
146 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
148 /* kludge for Apple PowerBook internal zip */
149 if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
150 printk(KERN_CONT "FLOPPY");
155 printk(KERN_CONT "CD/DVD-ROM");
158 printk(KERN_CONT "TAPE");
161 printk(KERN_CONT "OPTICAL");
162 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
165 printk(KERN_CONT "UNKNOWN (type %d)", type);
169 printk(KERN_CONT " drive\n");
171 /* an ATAPI device ignores DRDY */
172 drive->ready_stat = 0;
173 if (ata_id_cdb_intr(id))
174 drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
175 drive->dev_flags |= IDE_DFLAG_DOORLOCKING;
176 /* we don't do head unloading on ATAPI devices */
177 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
181 * do_identify - identify a drive
182 * @drive: drive to identify
185 * Called when we have issued a drive identify command to
186 * read and parse the results. This function is run with
187 * interrupts disabled.
190 static void do_identify(ide_drive_t *drive, u8 cmd)
192 ide_hwif_t *hwif = drive->hwif;
194 char *m = (char *)&id[ATA_ID_PROD];
198 /* local CPU only; some systems need this */
199 local_irq_save(flags);
200 /* read 512 bytes of id info */
201 hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
202 local_irq_restore(flags);
204 drive->dev_flags |= IDE_DFLAG_ID_READ;
206 printk(KERN_INFO "%s: dumping identify data\n", drive->name);
207 ide_dump_identify((u8 *)id);
212 * ATA_CMD_ID_ATA returns little-endian info,
213 * ATA_CMD_ID_ATAPI *usually* returns little-endian info.
215 if (cmd == ATA_CMD_ID_ATAPI) {
216 if ((m[0] == 'N' && m[1] == 'E') || /* NEC */
217 (m[0] == 'F' && m[1] == 'X') || /* Mitsumi */
218 (m[0] == 'P' && m[1] == 'i')) /* Pioneer */
219 /* Vertos drives may still be weird */
223 ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
224 ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
225 ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
227 /* we depend on this a lot! */
228 m[ATA_ID_PROD_LEN - 1] = '\0';
230 if (strstr(m, "E X A B Y T E N E S T"))
233 drive->dev_flags |= IDE_DFLAG_PRESENT;
234 drive->dev_flags &= ~IDE_DFLAG_DEAD;
237 * Check for an ATAPI device
239 if (cmd == ATA_CMD_ID_ATAPI)
240 ide_classify_atapi_dev(drive);
243 * Not an ATAPI device: looks like a "regular" hard disk
245 ide_classify_ata_dev(drive);
249 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
253 * actual_try_to_identify - send ata/atapi identify
254 * @drive: drive to identify
255 * @cmd: command to use
257 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
258 * and waits for a response.
260 * Returns: 0 device was identified
261 * 1 device timed-out (no response to identify request)
262 * 2 device aborted the command (refused to identify itself)
265 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
267 ide_hwif_t *hwif = drive->hwif;
268 struct ide_io_ports *io_ports = &hwif->io_ports;
269 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
270 int use_altstatus = 0, rc;
271 unsigned long timeout;
274 /* take a deep breath */
277 if (io_ports->ctl_addr &&
278 (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) {
279 a = tp_ops->read_altstatus(hwif);
280 s = tp_ops->read_status(hwif);
281 if ((a ^ s) & ~ATA_IDX)
282 /* ancient Seagate drives, broken interfaces */
283 printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
284 "instead of ALTSTATUS(0x%02x)\n",
287 /* use non-intrusive polling */
291 /* set features register for atapi
292 * identify command to be sure of reply
294 if (cmd == ATA_CMD_ID_ATAPI) {
297 memset(&task, 0, sizeof(task));
298 /* disable DMA & overlap */
299 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
301 tp_ops->tf_load(drive, &task);
304 /* ask drive for ID */
305 tp_ops->exec_command(hwif, cmd);
307 timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
309 if (ide_busy_sleep(hwif, timeout, use_altstatus))
312 /* wait for IRQ and ATA_DRQ */
314 s = tp_ops->read_status(hwif);
316 if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
317 /* drive returned ID */
318 do_identify(drive, cmd);
319 /* drive responded with ID */
321 /* clear drive IRQ */
322 (void)tp_ops->read_status(hwif);
324 /* drive refused ID */
331 * try_to_identify - try to identify a drive
332 * @drive: drive to probe
333 * @cmd: command to use
335 * Issue the identify command.
338 static int try_to_identify (ide_drive_t *drive, u8 cmd)
340 ide_hwif_t *hwif = drive->hwif;
341 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
344 * Disable device IRQ. Otherwise we'll get spurious interrupts
345 * during the identify phase that the IRQ handler isn't expecting.
347 if (hwif->io_ports.ctl_addr)
348 tp_ops->set_irq(hwif, 0);
350 return actual_try_to_identify(drive, cmd);
353 int ide_busy_sleep(ide_hwif_t *hwif, unsigned long timeout, int altstatus)
360 msleep(50); /* give drive a breather */
361 stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
362 : hwif->tp_ops->read_status(hwif);
363 if ((stat & ATA_BUSY) == 0)
365 } while (time_before(jiffies, timeout));
367 return 1; /* drive timed-out */
370 static u8 ide_read_device(ide_drive_t *drive)
374 memset(&task, 0, sizeof(task));
375 task.tf_flags = IDE_TFLAG_IN_DEVICE;
377 drive->hwif->tp_ops->tf_read(drive, &task);
379 return task.tf.device;
383 * do_probe - probe an IDE device
384 * @drive: drive to probe
385 * @cmd: command to use
387 * do_probe() has the difficult job of finding a drive if it exists,
388 * without getting hung up if it doesn't exist, without trampling on
389 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
391 * If a drive is "known" to exist (from CMOS or kernel parameters),
392 * but does not respond right away, the probe will "hang in there"
393 * for the maximum wait time (about 30 seconds), otherwise it will
394 * exit much more quickly.
396 * Returns: 0 device was identified
397 * 1 device timed-out (no response to identify request)
398 * 2 device aborted the command (refused to identify itself)
399 * 3 bad status from device (possible for ATAPI drives)
400 * 4 probe was not attempted because failure was obvious
403 static int do_probe (ide_drive_t *drive, u8 cmd)
405 ide_hwif_t *hwif = drive->hwif;
406 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
408 u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;
410 /* avoid waiting for inappropriate probes */
411 if (present && drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
415 printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
416 drive->name, present, drive->media,
417 (cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
420 /* needed for some systems
421 * (e.g. crw9624 as drive0 with disk as slave)
427 if (ide_read_device(drive) != drive->select && present == 0) {
429 /* exit with drive0 selected */
430 SELECT_DRIVE(hwif->devices[0]);
431 /* allow ATA_BUSY to assert & clear */
434 /* no i/f present: mmm.. this should be a 4 -ml */
438 stat = tp_ops->read_status(hwif);
440 if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
441 present || cmd == ATA_CMD_ID_ATAPI) {
442 /* send cmd and wait */
443 if ((rc = try_to_identify(drive, cmd))) {
444 /* failed: try again */
445 rc = try_to_identify(drive,cmd);
448 stat = tp_ops->read_status(hwif);
450 if (stat == (ATA_BUSY | ATA_DRDY))
453 if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
454 printk(KERN_ERR "%s: no response (status = 0x%02x), "
455 "resetting drive\n", drive->name, stat);
459 tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
460 (void)ide_busy_sleep(hwif, WAIT_WORSTCASE, 0);
461 rc = try_to_identify(drive, cmd);
464 /* ensure drive IRQ is clear */
465 stat = tp_ops->read_status(hwif);
468 printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
471 /* not present or maybe ATAPI */
475 /* exit with drive0 selected */
476 SELECT_DRIVE(hwif->devices[0]);
478 /* ensure drive irq is clear */
479 (void)tp_ops->read_status(hwif);
487 static void enable_nest (ide_drive_t *drive)
489 ide_hwif_t *hwif = drive->hwif;
490 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
493 printk(KERN_INFO "%s: enabling %s -- ",
494 hwif->name, (char *)&drive->id[ATA_ID_PROD]);
498 tp_ops->exec_command(hwif, ATA_EXABYTE_ENABLE_NEST);
500 if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 0)) {
501 printk(KERN_CONT "failed (timeout)\n");
507 stat = tp_ops->read_status(hwif);
509 if (!OK_STAT(stat, 0, BAD_STAT))
510 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
512 printk(KERN_CONT "success\n");
516 * probe_for_drives - upper level drive probe
517 * @drive: drive to probe for
519 * probe_for_drive() tests for existence of a given drive using do_probe()
520 * and presents things to the user as needed.
522 * Returns: 0 no device was found
524 * (note: IDE_DFLAG_PRESENT might still be not set)
527 static u8 probe_for_drive(ide_drive_t *drive)
532 * In order to keep things simple we have an id
533 * block for all drives at all times. If the device
534 * is pre ATA or refuses ATA/ATAPI identify we
535 * will add faked data to this.
537 * Also note that 0 everywhere means "can't do X"
540 drive->dev_flags &= ~IDE_DFLAG_ID_READ;
542 drive->id = kzalloc(SECTOR_SIZE, GFP_KERNEL);
543 if (drive->id == NULL) {
544 printk(KERN_ERR "ide: out of memory for id data.\n");
548 m = (char *)&drive->id[ATA_ID_PROD];
549 strcpy(m, "UNKNOWN");
552 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) {
554 /* if !(success||timed-out) */
555 if (do_probe(drive, ATA_CMD_ID_ATA) >= 2)
556 /* look for ATAPI device */
557 (void)do_probe(drive, ATA_CMD_ID_ATAPI);
559 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
560 /* drive not found */
563 if (strstr(m, "E X A B Y T E N E S T")) {
568 /* identification failed? */
569 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
570 if (drive->media == ide_disk) {
571 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
572 drive->name, drive->cyl,
573 drive->head, drive->sect);
574 } else if (drive->media == ide_cdrom) {
575 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
578 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
579 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
582 /* drive was found */
585 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
588 /* The drive wasn't being helpful. Add generic info only */
589 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
594 if (drive->media == ide_disk) {
595 ide_disk_init_chs(drive);
596 ide_disk_init_mult_count(drive);
599 return !!(drive->dev_flags & IDE_DFLAG_PRESENT);
602 static void hwif_release_dev(struct device *dev)
604 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
606 complete(&hwif->gendev_rel_comp);
609 static int ide_register_port(ide_hwif_t *hwif)
613 /* register with global device tree */
614 dev_set_name(&hwif->gendev, hwif->name);
615 hwif->gendev.driver_data = hwif;
616 if (hwif->gendev.parent == NULL)
617 hwif->gendev.parent = hwif->dev;
618 hwif->gendev.release = hwif_release_dev;
620 ret = device_register(&hwif->gendev);
622 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
627 hwif->portdev = device_create(ide_port_class, &hwif->gendev,
628 MKDEV(0, 0), hwif, hwif->name);
629 if (IS_ERR(hwif->portdev)) {
630 ret = PTR_ERR(hwif->portdev);
631 device_unregister(&hwif->gendev);
638 * ide_port_wait_ready - wait for port to become ready
641 * This is needed on some PPCs and a bunch of BIOS-less embedded
642 * platforms. Typical cases are:
644 * - The firmware hard reset the disk before booting the kernel,
645 * the drive is still doing it's poweron-reset sequence, that
646 * can take up to 30 seconds.
648 * - The firmware does nothing (or no firmware), the device is
649 * still in POST state (same as above actually).
651 * - Some CD/DVD/Writer combo drives tend to drive the bus during
652 * their reset sequence even when they are non-selected slave
653 * devices, thus preventing discovery of the main HD.
655 * Doing this wait-for-non-busy should not harm any existing
656 * configuration and fix some issues like the above.
660 * Returns 0 on success, error code (< 0) otherwise.
663 static int ide_port_wait_ready(ide_hwif_t *hwif)
668 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
670 /* Let HW settle down a bit from whatever init state we
674 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
675 * I know of at least one disk who takes 31 seconds, I use 35
678 rc = ide_wait_not_busy(hwif, 35000);
682 /* Now make sure both master & slave are ready */
683 ide_port_for_each_dev(i, drive, hwif) {
684 /* Ignore disks that we will not probe for later. */
685 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0 ||
686 (drive->dev_flags & IDE_DFLAG_PRESENT)) {
688 hwif->tp_ops->set_irq(hwif, 1);
690 rc = ide_wait_not_busy(hwif, 35000);
694 printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
698 /* Exit function with master reselected (let's be sane) */
700 SELECT_DRIVE(hwif->devices[0]);
706 * ide_undecoded_slave - look for bad CF adapters
707 * @dev1: slave device
709 * Analyse the drives on the interface and attempt to decide if we
710 * have the same drive viewed twice. This occurs with crap CF adapters
711 * and PCMCIA sometimes.
714 void ide_undecoded_slave(ide_drive_t *dev1)
716 ide_drive_t *dev0 = dev1->hwif->devices[0];
718 if ((dev1->dn & 1) == 0 || (dev0->dev_flags & IDE_DFLAG_PRESENT) == 0)
721 /* If the models don't match they are not the same product */
722 if (strcmp((char *)&dev0->id[ATA_ID_PROD],
723 (char *)&dev1->id[ATA_ID_PROD]))
726 /* Serial numbers do not match */
727 if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
728 (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
731 /* No serial number, thankfully very rare for CF */
732 if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
735 /* Appears to be an IDE flash adapter with decode bugs */
736 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
738 dev1->dev_flags &= ~IDE_DFLAG_PRESENT;
741 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
743 static int ide_probe_port(ide_hwif_t *hwif)
749 BUG_ON(hwif->present);
751 if ((hwif->devices[0]->dev_flags & IDE_DFLAG_NOPROBE) &&
752 (hwif->devices[1]->dev_flags & IDE_DFLAG_NOPROBE))
756 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
757 * we'll install our IRQ driver much later...
761 disable_irq(hwif->irq);
763 if (ide_port_wait_ready(hwif) == -EBUSY)
764 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
767 * Second drive should only exist if first drive was found,
768 * but a lot of cdrom drives are configured as single slaves.
770 ide_port_for_each_dev(i, drive, hwif) {
771 (void) probe_for_drive(drive);
772 if (drive->dev_flags & IDE_DFLAG_PRESENT)
777 * Use cached IRQ number. It might be (and is...) changed by probe
786 static void ide_port_tune_devices(ide_hwif_t *hwif)
788 const struct ide_port_ops *port_ops = hwif->port_ops;
792 ide_port_for_each_present_dev(i, drive, hwif) {
793 if (port_ops && port_ops->quirkproc)
794 port_ops->quirkproc(drive);
797 ide_port_for_each_present_dev(i, drive, hwif) {
798 ide_set_max_pio(drive);
800 drive->dev_flags |= IDE_DFLAG_NICE1;
810 static int ide_init_queue(ide_drive_t *drive)
812 struct request_queue *q;
813 ide_hwif_t *hwif = drive->hwif;
814 int max_sectors = 256;
815 int max_sg_entries = PRD_ENTRIES;
818 * Our default set up assumes the normal IDE case,
819 * that is 64K segmenting, standard PRD setup
820 * and LBA28. Some drivers then impose their own
821 * limits and LBA48 we could raise it but as yet
825 q = blk_init_queue_node(do_ide_request, NULL, hwif_to_node(hwif));
829 q->queuedata = drive;
830 blk_queue_segment_boundary(q, 0xffff);
832 if (hwif->rqsize < max_sectors)
833 max_sectors = hwif->rqsize;
834 blk_queue_max_sectors(q, max_sectors);
837 /* When we have an IOMMU, we may have a problem where pci_map_sg()
838 * creates segments that don't completely match our boundary
839 * requirements and thus need to be broken up again. Because it
840 * doesn't align properly either, we may actually have to break up
841 * to more segments than what was we got in the first place, a max
842 * worst case is twice as many.
843 * This will be fixed once we teach pci_map_sg() about our boundary
844 * requirements, hopefully soon. *FIXME*
846 if (!PCI_DMA_BUS_IS_PHYS)
847 max_sg_entries >>= 1;
848 #endif /* CONFIG_PCI */
850 blk_queue_max_hw_segments(q, max_sg_entries);
851 blk_queue_max_phys_segments(q, max_sg_entries);
853 /* assign drive queue */
856 /* needs drive->queue to be set */
857 ide_toggle_bounce(drive, 1);
862 static DEFINE_MUTEX(ide_cfg_mtx);
865 * For any present drive:
866 * - allocate the block device queue
868 static int ide_port_setup_devices(ide_hwif_t *hwif)
873 mutex_lock(&ide_cfg_mtx);
874 ide_port_for_each_present_dev(i, drive, hwif) {
875 if (ide_init_queue(drive)) {
876 printk(KERN_ERR "ide: failed to init %s\n",
880 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
886 mutex_unlock(&ide_cfg_mtx);
892 * This routine sets up the IRQ for an IDE interface.
894 static int init_irq (ide_hwif_t *hwif)
896 struct ide_io_ports *io_ports = &hwif->io_ports;
897 irq_handler_t irq_handler;
900 irq_handler = hwif->host->irq_handler;
901 if (irq_handler == NULL)
902 irq_handler = ide_intr;
904 #if defined(__mc68000__)
906 #endif /* __mc68000__ */
908 if (hwif->chipset == ide_pci)
911 if (io_ports->ctl_addr)
912 hwif->tp_ops->set_irq(hwif, 1);
914 if (request_irq(hwif->irq, irq_handler, sa, hwif->name, hwif))
918 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
919 (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
922 hwif->rqsize = 65536;
925 #if !defined(__mc68000__)
926 printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
927 io_ports->data_addr, io_ports->status_addr,
928 io_ports->ctl_addr, hwif->irq);
930 printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
931 io_ports->data_addr, hwif->irq);
932 #endif /* __mc68000__ */
933 if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE)
934 printk(KERN_CONT " (serialized)");
935 printk(KERN_CONT "\n");
942 static int ata_lock(dev_t dev, void *data)
944 /* FIXME: we want to pin hwif down */
948 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
950 ide_hwif_t *hwif = data;
951 int unit = *part >> PARTN_BITS;
952 ide_drive_t *drive = hwif->devices[unit];
954 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
957 if (drive->media == ide_disk)
958 request_module("ide-disk");
959 if (drive->media == ide_cdrom || drive->media == ide_optical)
960 request_module("ide-cd");
961 if (drive->media == ide_tape)
962 request_module("ide-tape");
963 if (drive->media == ide_floppy)
964 request_module("ide-floppy");
969 static struct kobject *exact_match(dev_t dev, int *part, void *data)
971 struct gendisk *p = data;
972 *part &= (1 << PARTN_BITS) - 1;
973 return &disk_to_dev(p)->kobj;
976 static int exact_lock(dev_t dev, void *data)
978 struct gendisk *p = data;
985 void ide_register_region(struct gendisk *disk)
987 blk_register_region(MKDEV(disk->major, disk->first_minor),
988 disk->minors, NULL, exact_match, exact_lock, disk);
991 EXPORT_SYMBOL_GPL(ide_register_region);
993 void ide_unregister_region(struct gendisk *disk)
995 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
999 EXPORT_SYMBOL_GPL(ide_unregister_region);
1001 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1003 ide_hwif_t *hwif = drive->hwif;
1004 unsigned int unit = drive->dn & 1;
1006 disk->major = hwif->major;
1007 disk->first_minor = unit << PARTN_BITS;
1008 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1009 disk->queue = drive->queue;
1012 EXPORT_SYMBOL_GPL(ide_init_disk);
1014 static void drive_release_dev (struct device *dev)
1016 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1017 ide_hwif_t *hwif = drive->hwif;
1019 ide_proc_unregister_device(drive);
1021 spin_lock_irq(&hwif->lock);
1024 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
1025 /* Messed up locking ... */
1026 spin_unlock_irq(&hwif->lock);
1027 blk_cleanup_queue(drive->queue);
1028 spin_lock_irq(&hwif->lock);
1029 drive->queue = NULL;
1030 spin_unlock_irq(&hwif->lock);
1032 complete(&drive->gendev_rel_comp);
1035 static int hwif_init(ide_hwif_t *hwif)
1038 printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
1042 if (register_blkdev(hwif->major, hwif->name))
1045 if (!hwif->sg_max_nents)
1046 hwif->sg_max_nents = PRD_ENTRIES;
1048 hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1050 if (!hwif->sg_table) {
1051 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1055 sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1057 if (init_irq(hwif)) {
1058 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1059 hwif->name, hwif->irq);
1063 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1064 THIS_MODULE, ata_probe, ata_lock, hwif);
1068 unregister_blkdev(hwif->major, hwif->name);
1072 static void hwif_register_devices(ide_hwif_t *hwif)
1077 ide_port_for_each_present_dev(i, drive, hwif) {
1078 struct device *dev = &drive->gendev;
1081 dev_set_name(dev, "%u.%u", hwif->index, i);
1082 dev->parent = &hwif->gendev;
1083 dev->bus = &ide_bus_type;
1084 dev->driver_data = drive;
1085 dev->release = drive_release_dev;
1087 ret = device_register(dev);
1089 printk(KERN_WARNING "IDE: %s: device_register error: "
1090 "%d\n", __func__, ret);
1094 static void ide_port_init_devices(ide_hwif_t *hwif)
1096 const struct ide_port_ops *port_ops = hwif->port_ops;
1100 ide_port_for_each_dev(i, drive, hwif) {
1101 drive->dn = i + hwif->channel * 2;
1103 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1104 drive->io_32bit = 1;
1105 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
1106 drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
1107 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1108 drive->dev_flags |= IDE_DFLAG_UNMASK;
1109 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1110 drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
1112 if (port_ops && port_ops->init_dev)
1113 port_ops->init_dev(drive);
1117 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1118 const struct ide_port_info *d)
1120 hwif->channel = port;
1123 hwif->chipset = d->chipset;
1128 /* ->host_flags may be set by ->init_iops (or even earlier...) */
1129 hwif->host_flags |= d->host_flags;
1130 hwif->pio_mask = d->pio_mask;
1133 hwif->tp_ops = d->tp_ops;
1135 /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1136 if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1137 hwif->port_ops = d->port_ops;
1139 hwif->swdma_mask = d->swdma_mask;
1140 hwif->mwdma_mask = d->mwdma_mask;
1141 hwif->ultra_mask = d->udma_mask;
1143 if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1146 hwif->dma_ops = d->dma_ops;
1149 rc = d->init_dma(hwif, d);
1151 rc = ide_hwif_setup_dma(hwif, d);
1154 printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1156 hwif->dma_ops = NULL;
1158 hwif->swdma_mask = 0;
1159 hwif->mwdma_mask = 0;
1160 hwif->ultra_mask = 0;
1164 if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1165 ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base))
1166 hwif->host->host_flags |= IDE_HFLAG_SERIALIZE;
1169 hwif->rqsize = d->max_sectors;
1171 /* call chipset specific routine for each enabled port */
1176 static void ide_port_cable_detect(ide_hwif_t *hwif)
1178 const struct ide_port_ops *port_ops = hwif->port_ops;
1180 if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1181 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1182 hwif->cbl = port_ops->cable_detect(hwif);
1186 static const u8 ide_hwif_to_major[] =
1187 { IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR, IDE4_MAJOR,
1188 IDE5_MAJOR, IDE6_MAJOR, IDE7_MAJOR, IDE8_MAJOR, IDE9_MAJOR };
1190 static void ide_port_init_devices_data(ide_hwif_t *hwif)
1195 ide_port_for_each_dev(i, drive, hwif) {
1196 u8 j = (hwif->index * MAX_DRIVES) + i;
1198 memset(drive, 0, sizeof(*drive));
1200 drive->media = ide_disk;
1201 drive->select = (i << 4) | ATA_DEVICE_OBS;
1203 drive->ready_stat = ATA_DRDY;
1204 drive->bad_wstat = BAD_W_STAT;
1205 drive->special.b.recalibrate = 1;
1206 drive->special.b.set_geometry = 1;
1207 drive->name[0] = 'h';
1208 drive->name[1] = 'd';
1209 drive->name[2] = 'a' + j;
1210 drive->max_failures = IDE_DEFAULT_MAX_FAILURES;
1212 INIT_LIST_HEAD(&drive->list);
1213 init_completion(&drive->gendev_rel_comp);
1217 static void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
1219 /* fill in any non-zero initial values */
1220 hwif->index = index;
1221 hwif->major = ide_hwif_to_major[index];
1223 hwif->name[0] = 'i';
1224 hwif->name[1] = 'd';
1225 hwif->name[2] = 'e';
1226 hwif->name[3] = '0' + index;
1228 spin_lock_init(&hwif->lock);
1230 init_timer(&hwif->timer);
1231 hwif->timer.function = &ide_timer_expiry;
1232 hwif->timer.data = (unsigned long)hwif;
1234 init_completion(&hwif->gendev_rel_comp);
1236 hwif->tp_ops = &default_tp_ops;
1238 ide_port_init_devices_data(hwif);
1241 static void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
1243 memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
1244 hwif->irq = hw->irq;
1245 hwif->chipset = hw->chipset;
1246 hwif->dev = hw->dev;
1247 hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
1248 hwif->ack_intr = hw->ack_intr;
1249 hwif->config_data = hw->config;
1252 static unsigned int ide_indexes;
1255 * ide_find_port_slot - find free port slot
1258 * Return the new port slot index or -ENOENT if we are out of free slots.
1261 static int ide_find_port_slot(const struct ide_port_info *d)
1264 u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1265 u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1268 * Claim an unassigned slot.
1270 * Give preference to claiming other slots before claiming ide0/ide1,
1271 * just in case there's another interface yet-to-be-scanned
1272 * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1274 * Unless there is a bootable card that does not use the standard
1275 * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1277 mutex_lock(&ide_cfg_mtx);
1279 if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1280 idx = ffz(ide_indexes | i);
1282 if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1283 idx = ffz(ide_indexes | 3);
1284 else if ((ide_indexes & 3) != 3)
1285 idx = ffz(ide_indexes);
1288 ide_indexes |= (1 << idx);
1289 mutex_unlock(&ide_cfg_mtx);
1294 static void ide_free_port_slot(int idx)
1296 mutex_lock(&ide_cfg_mtx);
1297 ide_indexes &= ~(1 << idx);
1298 mutex_unlock(&ide_cfg_mtx);
1301 static void ide_port_free_devices(ide_hwif_t *hwif)
1306 ide_port_for_each_dev(i, drive, hwif)
1310 static int ide_port_alloc_devices(ide_hwif_t *hwif, int node)
1314 for (i = 0; i < MAX_DRIVES; i++) {
1317 drive = kzalloc_node(sizeof(*drive), GFP_KERNEL, node);
1321 hwif->devices[i] = drive;
1326 ide_port_free_devices(hwif);
1330 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1332 struct ide_host *host;
1333 struct device *dev = hws[0] ? hws[0]->dev : NULL;
1334 int node = dev ? dev_to_node(dev) : -1;
1337 host = kzalloc_node(sizeof(*host), GFP_KERNEL, node);
1341 for (i = 0; i < MAX_HOST_PORTS; i++) {
1348 hwif = kzalloc_node(sizeof(*hwif), GFP_KERNEL, node);
1352 if (ide_port_alloc_devices(hwif, node) < 0) {
1357 idx = ide_find_port_slot(d);
1359 printk(KERN_ERR "%s: no free slot for interface\n",
1360 d ? d->name : "ide");
1365 ide_init_port_data(hwif, idx);
1369 host->ports[i] = hwif;
1373 if (host->n_ports == 0) {
1381 host->init_chipset = d->init_chipset;
1382 host->host_flags = d->host_flags;
1387 EXPORT_SYMBOL_GPL(ide_host_alloc);
1389 static void ide_port_free(ide_hwif_t *hwif)
1391 ide_port_free_devices(hwif);
1392 ide_free_port_slot(hwif->index);
1396 static void ide_disable_port(ide_hwif_t *hwif)
1398 struct ide_host *host = hwif->host;
1401 printk(KERN_INFO "%s: disabling port\n", hwif->name);
1403 for (i = 0; i < MAX_HOST_PORTS; i++) {
1404 if (host->ports[i] == hwif) {
1405 host->ports[i] = NULL;
1410 ide_port_free(hwif);
1413 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1416 ide_hwif_t *hwif, *mate = NULL;
1419 ide_host_for_each_port(i, hwif, host) {
1425 ide_init_port_hw(hwif, hws[i]);
1426 ide_port_apply_params(hwif);
1431 if ((i & 1) && mate) {
1436 mate = (i & 1) ? NULL : hwif;
1438 ide_init_port(hwif, i & 1, d);
1439 ide_port_cable_detect(hwif);
1442 ide_port_init_devices(hwif);
1445 ide_host_for_each_port(i, hwif, host) {
1449 if (ide_probe_port(hwif) == 0)
1452 if (hwif->chipset != ide_4drives || !hwif->mate ||
1453 !hwif->mate->present) {
1454 if (ide_register_port(hwif)) {
1455 ide_disable_port(hwif);
1461 ide_port_tune_devices(hwif);
1464 ide_host_for_each_port(i, hwif, host) {
1468 if (hwif_init(hwif) == 0) {
1469 printk(KERN_INFO "%s: failed to initialize IDE "
1470 "interface\n", hwif->name);
1471 device_unregister(&hwif->gendev);
1472 ide_disable_port(hwif);
1477 if (ide_port_setup_devices(hwif) == 0) {
1484 ide_acpi_init_port(hwif);
1487 ide_acpi_port_init_devices(hwif);
1490 ide_host_for_each_port(i, hwif, host) {
1495 hwif_register_devices(hwif);
1498 ide_host_for_each_port(i, hwif, host) {
1502 ide_sysfs_register_port(hwif);
1503 ide_proc_register_port(hwif);
1506 ide_proc_port_register_devices(hwif);
1511 EXPORT_SYMBOL_GPL(ide_host_register);
1513 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1514 struct ide_host **hostp)
1516 struct ide_host *host;
1519 host = ide_host_alloc(d, hws);
1523 rc = ide_host_register(host, d, hws);
1525 ide_host_free(host);
1534 EXPORT_SYMBOL_GPL(ide_host_add);
1536 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
1541 ide_port_for_each_present_dev(i, drive, hwif) {
1542 device_unregister(&drive->gendev);
1543 wait_for_completion(&drive->gendev_rel_comp);
1547 void ide_port_unregister_devices(ide_hwif_t *hwif)
1549 mutex_lock(&ide_cfg_mtx);
1550 __ide_port_unregister_devices(hwif);
1552 ide_port_init_devices_data(hwif);
1553 mutex_unlock(&ide_cfg_mtx);
1555 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
1558 * ide_unregister - free an IDE interface
1559 * @hwif: IDE interface
1561 * Perform the final unregister of an IDE interface.
1564 * The caller must not hold the IDE locks.
1566 * It is up to the caller to be sure there is no pending I/O here,
1567 * and that the interface will not be reopened (present/vanishing
1568 * locking isn't yet done BTW).
1571 static void ide_unregister(ide_hwif_t *hwif)
1573 BUG_ON(in_interrupt());
1574 BUG_ON(irqs_disabled());
1576 mutex_lock(&ide_cfg_mtx);
1578 if (hwif->present) {
1579 __ide_port_unregister_devices(hwif);
1583 ide_proc_unregister_port(hwif);
1585 free_irq(hwif->irq, hwif);
1587 device_unregister(hwif->portdev);
1588 device_unregister(&hwif->gendev);
1589 wait_for_completion(&hwif->gendev_rel_comp);
1592 * Remove us from the kernel's knowledge
1594 blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
1595 kfree(hwif->sg_table);
1596 unregister_blkdev(hwif->major, hwif->name);
1598 ide_release_dma_engine(hwif);
1600 mutex_unlock(&ide_cfg_mtx);
1603 void ide_host_free(struct ide_host *host)
1608 ide_host_for_each_port(i, hwif, host) {
1610 ide_port_free(hwif);
1615 EXPORT_SYMBOL_GPL(ide_host_free);
1617 void ide_host_remove(struct ide_host *host)
1622 ide_host_for_each_port(i, hwif, host) {
1624 ide_unregister(hwif);
1627 ide_host_free(host);
1629 EXPORT_SYMBOL_GPL(ide_host_remove);
1631 void ide_port_scan(ide_hwif_t *hwif)
1633 ide_port_apply_params(hwif);
1634 ide_port_cable_detect(hwif);
1635 ide_port_init_devices(hwif);
1637 if (ide_probe_port(hwif) < 0)
1642 ide_port_tune_devices(hwif);
1643 ide_port_setup_devices(hwif);
1644 ide_acpi_port_init_devices(hwif);
1645 hwif_register_devices(hwif);
1646 ide_proc_port_register_devices(hwif);
1648 EXPORT_SYMBOL_GPL(ide_port_scan);