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 void do_identify(ide_drive_t *drive, u8 cmd)
116 ide_hwif_t *hwif = HWIF(drive);
118 char *m = (char *)&id[ATA_ID_PROD];
120 int bswap = 1, is_cfa;
122 /* local CPU only; some systems need this */
123 local_irq_save(flags);
124 /* read 512 bytes of id info */
125 hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
126 local_irq_restore(flags);
128 drive->dev_flags |= IDE_DFLAG_ID_READ;
130 printk(KERN_INFO "%s: dumping identify data\n", drive->name);
131 ide_dump_identify((u8 *)id);
136 * ATA_CMD_ID_ATA returns little-endian info,
137 * ATA_CMD_ID_ATAPI *usually* returns little-endian info.
139 if (cmd == ATA_CMD_ID_ATAPI) {
140 if ((m[0] == 'N' && m[1] == 'E') || /* NEC */
141 (m[0] == 'F' && m[1] == 'X') || /* Mitsumi */
142 (m[0] == 'P' && m[1] == 'i')) /* Pioneer */
143 /* Vertos drives may still be weird */
147 ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
148 ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
149 ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
151 /* we depend on this a lot! */
152 m[ATA_ID_PROD_LEN - 1] = '\0';
154 if (strstr(m, "E X A B Y T E N E S T"))
157 printk(KERN_INFO "%s: %s, ", drive->name, m);
159 drive->dev_flags |= IDE_DFLAG_PRESENT;
160 drive->dev_flags &= ~IDE_DFLAG_DEAD;
163 * Check for an ATAPI device
165 if (cmd == ATA_CMD_ID_ATAPI) {
166 u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;
168 printk(KERN_CONT "ATAPI ");
171 if (!strstr(m, "CD-ROM")) {
172 if (!strstr(m, "oppy") &&
173 !strstr(m, "poyp") &&
175 printk(KERN_CONT "cdrom or floppy?, assuming ");
176 if (drive->media != ide_cdrom) {
177 printk(KERN_CONT "FLOPPY");
178 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
182 /* Early cdrom models used zero */
185 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
187 /* kludge for Apple PowerBook internal zip */
188 if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
189 printk(KERN_CONT "FLOPPY");
194 printk(KERN_CONT "CD/DVD-ROM");
197 printk(KERN_CONT "TAPE");
200 printk(KERN_CONT "OPTICAL");
201 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
204 printk(KERN_CONT "UNKNOWN (type %d)", type);
207 printk(KERN_CONT " drive\n");
209 /* an ATAPI device ignores DRDY */
210 drive->ready_stat = 0;
211 if (ata_id_cdb_intr(id))
212 drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
213 drive->dev_flags |= IDE_DFLAG_DOORLOCKING;
214 /* we don't do head unloading on ATAPI devices */
215 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
220 * Not an ATAPI device: looks like a "regular" hard disk
223 is_cfa = ata_id_is_cfa(id);
225 /* CF devices are *not* removable in Linux definition of the term */
226 if (is_cfa == 0 && (id[ATA_ID_CONFIG] & (1 << 7)))
227 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
229 drive->media = ide_disk;
231 if (!ata_id_has_unload(drive->id))
232 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
234 printk(KERN_CONT "%s DISK drive\n", is_cfa ? "CFA" : "ATA");
240 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
245 * actual_try_to_identify - send ata/atapi identify
246 * @drive: drive to identify
247 * @cmd: command to use
249 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
250 * and waits for a response. It also monitors irqs while this is
251 * happening, in hope of automatically determining which one is
252 * being used by the interface.
254 * Returns: 0 device was identified
255 * 1 device timed-out (no response to identify request)
256 * 2 device aborted the command (refused to identify itself)
259 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
261 ide_hwif_t *hwif = HWIF(drive);
262 struct ide_io_ports *io_ports = &hwif->io_ports;
263 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
264 int use_altstatus = 0, rc;
265 unsigned long timeout;
268 /* take a deep breath */
271 if (io_ports->ctl_addr &&
272 (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) {
273 a = tp_ops->read_altstatus(hwif);
274 s = tp_ops->read_status(hwif);
275 if ((a ^ s) & ~ATA_IDX)
276 /* ancient Seagate drives, broken interfaces */
277 printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
278 "instead of ALTSTATUS(0x%02x)\n",
281 /* use non-intrusive polling */
285 /* set features register for atapi
286 * identify command to be sure of reply
288 if (cmd == ATA_CMD_ID_ATAPI) {
291 memset(&task, 0, sizeof(task));
292 /* disable DMA & overlap */
293 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
295 tp_ops->tf_load(drive, &task);
298 /* ask drive for ID */
299 tp_ops->exec_command(hwif, cmd);
301 timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
303 if (ide_busy_sleep(hwif, timeout, use_altstatus))
306 /* wait for IRQ and ATA_DRQ */
308 s = tp_ops->read_status(hwif);
310 if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
311 /* drive returned ID */
312 do_identify(drive, cmd);
313 /* drive responded with ID */
315 /* clear drive IRQ */
316 (void)tp_ops->read_status(hwif);
318 /* drive refused ID */
325 * try_to_identify - try to identify a drive
326 * @drive: drive to probe
327 * @cmd: command to use
329 * Issue the identify command and then do IRQ probing to
330 * complete the identification when needed by finding the
331 * IRQ the drive is attached to
334 static int try_to_identify (ide_drive_t *drive, u8 cmd)
336 ide_hwif_t *hwif = HWIF(drive);
337 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
340 unsigned long cookie = 0;
343 * Disable device irq unless we need to
344 * probe for it. Otherwise we'll get spurious
345 * interrupts during the identify-phase that
346 * the irq handler isn't expecting.
348 if (hwif->io_ports.ctl_addr) {
351 cookie = probe_irq_on();
353 tp_ops->set_irq(hwif, autoprobe);
356 retval = actual_try_to_identify(drive, cmd);
361 tp_ops->set_irq(hwif, 0);
362 /* clear drive IRQ */
363 (void)tp_ops->read_status(hwif);
365 irq = probe_irq_off(cookie);
370 /* Mmmm.. multiple IRQs..
371 * don't know which was ours
373 printk(KERN_ERR "%s: IRQ probe failed (0x%lx)\n",
374 drive->name, cookie);
381 int ide_busy_sleep(ide_hwif_t *hwif, unsigned long timeout, int altstatus)
388 msleep(50); /* give drive a breather */
389 stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
390 : hwif->tp_ops->read_status(hwif);
391 if ((stat & ATA_BUSY) == 0)
393 } while (time_before(jiffies, timeout));
395 return 1; /* drive timed-out */
398 static u8 ide_read_device(ide_drive_t *drive)
402 memset(&task, 0, sizeof(task));
403 task.tf_flags = IDE_TFLAG_IN_DEVICE;
405 drive->hwif->tp_ops->tf_read(drive, &task);
407 return task.tf.device;
411 * do_probe - probe an IDE device
412 * @drive: drive to probe
413 * @cmd: command to use
415 * do_probe() has the difficult job of finding a drive if it exists,
416 * without getting hung up if it doesn't exist, without trampling on
417 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
419 * If a drive is "known" to exist (from CMOS or kernel parameters),
420 * but does not respond right away, the probe will "hang in there"
421 * for the maximum wait time (about 30 seconds), otherwise it will
422 * exit much more quickly.
424 * Returns: 0 device was identified
425 * 1 device timed-out (no response to identify request)
426 * 2 device aborted the command (refused to identify itself)
427 * 3 bad status from device (possible for ATAPI drives)
428 * 4 probe was not attempted because failure was obvious
431 static int do_probe (ide_drive_t *drive, u8 cmd)
433 ide_hwif_t *hwif = HWIF(drive);
434 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
436 u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;
438 /* avoid waiting for inappropriate probes */
439 if (present && drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
443 printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
444 drive->name, present, drive->media,
445 (cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
448 /* needed for some systems
449 * (e.g. crw9624 as drive0 with disk as slave)
455 if (ide_read_device(drive) != drive->select && present == 0) {
457 /* exit with drive0 selected */
458 SELECT_DRIVE(&hwif->drives[0]);
459 /* allow ATA_BUSY to assert & clear */
462 /* no i/f present: mmm.. this should be a 4 -ml */
466 stat = tp_ops->read_status(hwif);
468 if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
469 present || cmd == ATA_CMD_ID_ATAPI) {
470 /* send cmd and wait */
471 if ((rc = try_to_identify(drive, cmd))) {
472 /* failed: try again */
473 rc = try_to_identify(drive,cmd);
476 stat = tp_ops->read_status(hwif);
478 if (stat == (ATA_BUSY | ATA_DRDY))
481 if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
482 printk(KERN_ERR "%s: no response (status = 0x%02x), "
483 "resetting drive\n", drive->name, stat);
487 tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
488 (void)ide_busy_sleep(hwif, WAIT_WORSTCASE, 0);
489 rc = try_to_identify(drive, cmd);
492 /* ensure drive IRQ is clear */
493 stat = tp_ops->read_status(hwif);
496 printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
499 /* not present or maybe ATAPI */
503 /* exit with drive0 selected */
504 SELECT_DRIVE(&hwif->drives[0]);
506 /* ensure drive irq is clear */
507 (void)tp_ops->read_status(hwif);
515 static void enable_nest (ide_drive_t *drive)
517 ide_hwif_t *hwif = HWIF(drive);
518 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
521 printk(KERN_INFO "%s: enabling %s -- ",
522 hwif->name, (char *)&drive->id[ATA_ID_PROD]);
526 tp_ops->exec_command(hwif, ATA_EXABYTE_ENABLE_NEST);
528 if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 0)) {
529 printk(KERN_CONT "failed (timeout)\n");
535 stat = tp_ops->read_status(hwif);
537 if (!OK_STAT(stat, 0, BAD_STAT))
538 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
540 printk(KERN_CONT "success\n");
544 * probe_for_drives - upper level drive probe
545 * @drive: drive to probe for
547 * probe_for_drive() tests for existence of a given drive using do_probe()
548 * and presents things to the user as needed.
550 * Returns: 0 no device was found
552 * (note: IDE_DFLAG_PRESENT might still be not set)
555 static u8 probe_for_drive(ide_drive_t *drive)
560 * In order to keep things simple we have an id
561 * block for all drives at all times. If the device
562 * is pre ATA or refuses ATA/ATAPI identify we
563 * will add faked data to this.
565 * Also note that 0 everywhere means "can't do X"
568 drive->dev_flags &= ~IDE_DFLAG_ID_READ;
570 drive->id = kzalloc(SECTOR_SIZE, GFP_KERNEL);
571 if (drive->id == NULL) {
572 printk(KERN_ERR "ide: out of memory for id data.\n");
576 m = (char *)&drive->id[ATA_ID_PROD];
577 strcpy(m, "UNKNOWN");
580 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) {
582 /* if !(success||timed-out) */
583 if (do_probe(drive, ATA_CMD_ID_ATA) >= 2)
584 /* look for ATAPI device */
585 (void)do_probe(drive, ATA_CMD_ID_ATAPI);
587 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
588 /* drive not found */
591 if (strstr(m, "E X A B Y T E N E S T")) {
596 /* identification failed? */
597 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
598 if (drive->media == ide_disk) {
599 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
600 drive->name, drive->cyl,
601 drive->head, drive->sect);
602 } else if (drive->media == ide_cdrom) {
603 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
606 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
607 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
610 /* drive was found */
613 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
616 /* The drive wasn't being helpful. Add generic info only */
617 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
622 if (drive->media == ide_disk) {
623 ide_disk_init_chs(drive);
624 ide_disk_init_mult_count(drive);
627 return !!(drive->dev_flags & IDE_DFLAG_PRESENT);
630 static void hwif_release_dev(struct device *dev)
632 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
634 complete(&hwif->gendev_rel_comp);
637 static int ide_register_port(ide_hwif_t *hwif)
641 /* register with global device tree */
642 dev_set_name(&hwif->gendev, hwif->name);
643 hwif->gendev.driver_data = hwif;
644 hwif->gendev.parent = hwif->dev;
645 hwif->gendev.release = hwif_release_dev;
647 ret = device_register(&hwif->gendev);
649 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
654 hwif->portdev = device_create(ide_port_class, &hwif->gendev,
655 MKDEV(0, 0), hwif, hwif->name);
656 if (IS_ERR(hwif->portdev)) {
657 ret = PTR_ERR(hwif->portdev);
658 device_unregister(&hwif->gendev);
665 * ide_port_wait_ready - wait for port to become ready
668 * This is needed on some PPCs and a bunch of BIOS-less embedded
669 * platforms. Typical cases are:
671 * - The firmware hard reset the disk before booting the kernel,
672 * the drive is still doing it's poweron-reset sequence, that
673 * can take up to 30 seconds.
675 * - The firmware does nothing (or no firmware), the device is
676 * still in POST state (same as above actually).
678 * - Some CD/DVD/Writer combo drives tend to drive the bus during
679 * their reset sequence even when they are non-selected slave
680 * devices, thus preventing discovery of the main HD.
682 * Doing this wait-for-non-busy should not harm any existing
683 * configuration and fix some issues like the above.
687 * Returns 0 on success, error code (< 0) otherwise.
690 static int ide_port_wait_ready(ide_hwif_t *hwif)
694 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
696 /* Let HW settle down a bit from whatever init state we
700 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
701 * I know of at least one disk who takes 31 seconds, I use 35
704 rc = ide_wait_not_busy(hwif, 35000);
708 /* Now make sure both master & slave are ready */
709 for (unit = 0; unit < MAX_DRIVES; unit++) {
710 ide_drive_t *drive = &hwif->drives[unit];
712 /* Ignore disks that we will not probe for later. */
713 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0 ||
714 (drive->dev_flags & IDE_DFLAG_PRESENT)) {
716 hwif->tp_ops->set_irq(hwif, 1);
718 rc = ide_wait_not_busy(hwif, 35000);
722 printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
726 /* Exit function with master reselected (let's be sane) */
728 SELECT_DRIVE(&hwif->drives[0]);
734 * ide_undecoded_slave - look for bad CF adapters
735 * @dev1: slave device
737 * Analyse the drives on the interface and attempt to decide if we
738 * have the same drive viewed twice. This occurs with crap CF adapters
739 * and PCMCIA sometimes.
742 void ide_undecoded_slave(ide_drive_t *dev1)
744 ide_drive_t *dev0 = &dev1->hwif->drives[0];
746 if ((dev1->dn & 1) == 0 || (dev0->dev_flags & IDE_DFLAG_PRESENT) == 0)
749 /* If the models don't match they are not the same product */
750 if (strcmp((char *)&dev0->id[ATA_ID_PROD],
751 (char *)&dev1->id[ATA_ID_PROD]))
754 /* Serial numbers do not match */
755 if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
756 (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
759 /* No serial number, thankfully very rare for CF */
760 if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
763 /* Appears to be an IDE flash adapter with decode bugs */
764 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
766 dev1->dev_flags &= ~IDE_DFLAG_PRESENT;
769 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
771 static int ide_probe_port(ide_hwif_t *hwif)
775 int unit, rc = -ENODEV;
777 BUG_ON(hwif->present);
779 if ((hwif->drives[0].dev_flags & IDE_DFLAG_NOPROBE) &&
780 (hwif->drives[1].dev_flags & IDE_DFLAG_NOPROBE))
784 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
785 * we'll install our IRQ driver much later...
789 disable_irq(hwif->irq);
791 local_irq_set(flags);
793 if (ide_port_wait_ready(hwif) == -EBUSY)
794 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
797 * Second drive should only exist if first drive was found,
798 * but a lot of cdrom drives are configured as single slaves.
800 for (unit = 0; unit < MAX_DRIVES; ++unit) {
801 ide_drive_t *drive = &hwif->drives[unit];
803 (void) probe_for_drive(drive);
804 if (drive->dev_flags & IDE_DFLAG_PRESENT)
808 local_irq_restore(flags);
811 * Use cached IRQ number. It might be (and is...) changed by probe
820 static void ide_port_tune_devices(ide_hwif_t *hwif)
822 const struct ide_port_ops *port_ops = hwif->port_ops;
825 for (unit = 0; unit < MAX_DRIVES; unit++) {
826 ide_drive_t *drive = &hwif->drives[unit];
828 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
829 if (port_ops && port_ops->quirkproc)
830 port_ops->quirkproc(drive);
834 for (unit = 0; unit < MAX_DRIVES; ++unit) {
835 ide_drive_t *drive = &hwif->drives[unit];
837 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
838 ide_set_max_pio(drive);
840 drive->dev_flags |= IDE_DFLAG_NICE1;
847 for (unit = 0; unit < MAX_DRIVES; ++unit) {
848 ide_drive_t *drive = &hwif->drives[unit];
850 if ((hwif->host_flags & IDE_HFLAG_NO_IO_32BIT) ||
851 drive->id[ATA_ID_DWORD_IO])
852 drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
854 drive->dev_flags &= ~IDE_DFLAG_NO_IO_32BIT;
861 static int ide_init_queue(ide_drive_t *drive)
863 struct request_queue *q;
864 ide_hwif_t *hwif = HWIF(drive);
865 int max_sectors = 256;
866 int max_sg_entries = PRD_ENTRIES;
869 * Our default set up assumes the normal IDE case,
870 * that is 64K segmenting, standard PRD setup
871 * and LBA28. Some drivers then impose their own
872 * limits and LBA48 we could raise it but as yet
876 q = blk_init_queue_node(do_ide_request, &hwif->hwgroup->lock,
881 q->queuedata = drive;
882 blk_queue_segment_boundary(q, 0xffff);
884 if (hwif->rqsize < max_sectors)
885 max_sectors = hwif->rqsize;
886 blk_queue_max_sectors(q, max_sectors);
889 /* When we have an IOMMU, we may have a problem where pci_map_sg()
890 * creates segments that don't completely match our boundary
891 * requirements and thus need to be broken up again. Because it
892 * doesn't align properly either, we may actually have to break up
893 * to more segments than what was we got in the first place, a max
894 * worst case is twice as many.
895 * This will be fixed once we teach pci_map_sg() about our boundary
896 * requirements, hopefully soon. *FIXME*
898 if (!PCI_DMA_BUS_IS_PHYS)
899 max_sg_entries >>= 1;
900 #endif /* CONFIG_PCI */
902 blk_queue_max_hw_segments(q, max_sg_entries);
903 blk_queue_max_phys_segments(q, max_sg_entries);
905 /* assign drive queue */
908 /* needs drive->queue to be set */
909 ide_toggle_bounce(drive, 1);
914 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
916 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
918 spin_lock_irq(&hwgroup->lock);
919 if (!hwgroup->drive) {
920 /* first drive for hwgroup. */
922 hwgroup->drive = drive;
923 hwgroup->hwif = HWIF(hwgroup->drive);
925 drive->next = hwgroup->drive->next;
926 hwgroup->drive->next = drive;
928 spin_unlock_irq(&hwgroup->lock);
932 * For any present drive:
933 * - allocate the block device queue
934 * - link drive into the hwgroup
936 static int ide_port_setup_devices(ide_hwif_t *hwif)
940 mutex_lock(&ide_cfg_mtx);
941 for (i = 0; i < MAX_DRIVES; i++) {
942 ide_drive_t *drive = &hwif->drives[i];
944 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
947 if (ide_init_queue(drive)) {
948 printk(KERN_ERR "ide: failed to init %s\n",
952 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
958 ide_add_drive_to_hwgroup(drive);
960 mutex_unlock(&ide_cfg_mtx);
965 static ide_hwif_t *ide_ports[MAX_HWIFS];
967 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
969 ide_hwgroup_t *hwgroup = hwif->hwgroup;
971 ide_ports[hwif->index] = NULL;
973 spin_lock_irq(&hwgroup->lock);
975 * Remove us from the hwgroup, and free
976 * the hwgroup if we were the only member
978 if (hwif->next == hwif) {
979 BUG_ON(hwgroup->hwif != hwif);
982 /* There is another interface in hwgroup.
983 * Unlink us, and set hwgroup->drive and ->hwif to
986 ide_hwif_t *g = hwgroup->hwif;
988 while (g->next != hwif)
990 g->next = hwif->next;
991 if (hwgroup->hwif == hwif) {
992 /* Chose a random hwif for hwgroup->hwif.
993 * It's guaranteed that there are no drives
994 * left in the hwgroup.
996 BUG_ON(hwgroup->drive != NULL);
999 BUG_ON(hwgroup->hwif == hwif);
1001 spin_unlock_irq(&hwgroup->lock);
1005 * This routine sets up the irq for an ide interface, and creates a new
1006 * hwgroup for the irq/hwif if none was previously assigned.
1008 * Much of the code is for correctly detecting/handling irq sharing
1009 * and irq serialization situations. This is somewhat complex because
1010 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1012 static int init_irq (ide_hwif_t *hwif)
1014 struct ide_io_ports *io_ports = &hwif->io_ports;
1016 ide_hwgroup_t *hwgroup;
1017 ide_hwif_t *match = NULL;
1019 mutex_lock(&ide_cfg_mtx);
1020 hwif->hwgroup = NULL;
1022 for (index = 0; index < MAX_HWIFS; index++) {
1023 ide_hwif_t *h = ide_ports[index];
1025 if (h && h->hwgroup) { /* scan only initialized ports */
1026 if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE) {
1027 if (hwif->host == h->host)
1034 * If we are still without a hwgroup, then form a new one
1037 hwgroup = match->hwgroup;
1038 hwif->hwgroup = hwgroup;
1040 * Link us into the hwgroup.
1041 * This must be done early, do ensure that unexpected_intr
1042 * can find the hwif and prevent irq storms.
1043 * No drives are attached to the new hwif, choose_drive
1044 * can't do anything stupid (yet).
1045 * Add ourself as the 2nd entry to the hwgroup->hwif
1046 * linked list, the first entry is the hwif that owns
1047 * hwgroup->handler - do not change that.
1049 spin_lock_irq(&hwgroup->lock);
1050 hwif->next = hwgroup->hwif->next;
1051 hwgroup->hwif->next = hwif;
1052 BUG_ON(hwif->next == hwif);
1053 spin_unlock_irq(&hwgroup->lock);
1055 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1056 hwif_to_node(hwif));
1057 if (hwgroup == NULL)
1060 spin_lock_init(&hwgroup->lock);
1062 hwif->hwgroup = hwgroup;
1063 hwgroup->hwif = hwif->next = hwif;
1065 init_timer(&hwgroup->timer);
1066 hwgroup->timer.function = &ide_timer_expiry;
1067 hwgroup->timer.data = (unsigned long) hwgroup;
1070 ide_ports[hwif->index] = hwif;
1073 * Allocate the irq, if not already obtained for another hwif
1075 if (!match || match->irq != hwif->irq) {
1077 #if defined(__mc68000__)
1079 #endif /* __mc68000__ */
1081 if (hwif->chipset == ide_pci)
1084 if (io_ports->ctl_addr)
1085 hwif->tp_ops->set_irq(hwif, 1);
1087 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1091 if (!hwif->rqsize) {
1092 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1093 (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1096 hwif->rqsize = 65536;
1099 #if !defined(__mc68000__)
1100 printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1101 io_ports->data_addr, io_ports->status_addr,
1102 io_ports->ctl_addr, hwif->irq);
1104 printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
1105 io_ports->data_addr, hwif->irq);
1106 #endif /* __mc68000__ */
1108 printk(KERN_CONT " (serialized with %s)", match->name);
1109 printk(KERN_CONT "\n");
1111 mutex_unlock(&ide_cfg_mtx);
1114 ide_remove_port_from_hwgroup(hwif);
1116 mutex_unlock(&ide_cfg_mtx);
1120 static int ata_lock(dev_t dev, void *data)
1122 /* FIXME: we want to pin hwif down */
1126 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1128 ide_hwif_t *hwif = data;
1129 int unit = *part >> PARTN_BITS;
1130 ide_drive_t *drive = &hwif->drives[unit];
1132 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1135 if (drive->media == ide_disk)
1136 request_module("ide-disk");
1137 if (drive->dev_flags & IDE_DFLAG_SCSI)
1138 request_module("ide-scsi");
1139 if (drive->media == ide_cdrom || drive->media == ide_optical)
1140 request_module("ide-cd");
1141 if (drive->media == ide_tape)
1142 request_module("ide-tape");
1143 if (drive->media == ide_floppy)
1144 request_module("ide-floppy");
1149 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1151 struct gendisk *p = data;
1152 *part &= (1 << PARTN_BITS) - 1;
1153 return &disk_to_dev(p)->kobj;
1156 static int exact_lock(dev_t dev, void *data)
1158 struct gendisk *p = data;
1165 void ide_register_region(struct gendisk *disk)
1167 blk_register_region(MKDEV(disk->major, disk->first_minor),
1168 disk->minors, NULL, exact_match, exact_lock, disk);
1171 EXPORT_SYMBOL_GPL(ide_register_region);
1173 void ide_unregister_region(struct gendisk *disk)
1175 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1179 EXPORT_SYMBOL_GPL(ide_unregister_region);
1181 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1183 ide_hwif_t *hwif = drive->hwif;
1184 unsigned int unit = drive->dn & 1;
1186 disk->major = hwif->major;
1187 disk->first_minor = unit << PARTN_BITS;
1188 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1189 disk->queue = drive->queue;
1192 EXPORT_SYMBOL_GPL(ide_init_disk);
1194 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1196 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1198 if (drive == drive->next) {
1199 /* special case: last drive from hwgroup. */
1200 BUG_ON(hwgroup->drive != drive);
1201 hwgroup->drive = NULL;
1205 walk = hwgroup->drive;
1206 while (walk->next != drive)
1208 walk->next = drive->next;
1209 if (hwgroup->drive == drive) {
1210 hwgroup->drive = drive->next;
1211 hwgroup->hwif = hwgroup->drive->hwif;
1214 BUG_ON(hwgroup->drive == drive);
1217 static void drive_release_dev (struct device *dev)
1219 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1220 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1222 ide_proc_unregister_device(drive);
1224 spin_lock_irq(&hwgroup->lock);
1225 ide_remove_drive_from_hwgroup(drive);
1228 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
1229 /* Messed up locking ... */
1230 spin_unlock_irq(&hwgroup->lock);
1231 blk_cleanup_queue(drive->queue);
1232 spin_lock_irq(&hwgroup->lock);
1233 drive->queue = NULL;
1234 spin_unlock_irq(&hwgroup->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(KERN_ERR "%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(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1277 hwif->name, old_irq);
1280 if (init_irq(hwif)) {
1281 printk(KERN_ERR "%s: probed IRQ %d and default IRQ %d failed\n",
1282 hwif->name, old_irq, hwif->irq);
1285 printk(KERN_WARNING "%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->dev_flags & IDE_DFLAG_PRESENT) == 0)
1310 dev_set_name(dev, "%u.%u", hwif->index, i);
1311 dev->parent = &hwif->gendev;
1312 dev->bus = &ide_bus_type;
1313 dev->driver_data = drive;
1314 dev->release = drive_release_dev;
1316 ret = device_register(dev);
1318 printk(KERN_WARNING "IDE: %s: device_register error: "
1319 "%d\n", __func__, ret);
1323 static void ide_port_init_devices(ide_hwif_t *hwif)
1325 const struct ide_port_ops *port_ops = hwif->port_ops;
1328 for (i = 0; i < MAX_DRIVES; i++) {
1329 ide_drive_t *drive = &hwif->drives[i];
1331 drive->dn = i + hwif->channel * 2;
1333 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1334 drive->io_32bit = 1;
1335 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1336 drive->dev_flags |= IDE_DFLAG_UNMASK;
1337 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1338 drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
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;
1365 hwif->tp_ops = d->tp_ops;
1367 /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1368 if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1369 hwif->port_ops = d->port_ops;
1371 hwif->swdma_mask = d->swdma_mask;
1372 hwif->mwdma_mask = d->mwdma_mask;
1373 hwif->ultra_mask = d->udma_mask;
1375 if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1379 rc = d->init_dma(hwif, d);
1381 rc = ide_hwif_setup_dma(hwif, d);
1384 printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1386 hwif->swdma_mask = 0;
1387 hwif->mwdma_mask = 0;
1388 hwif->ultra_mask = 0;
1389 } else if (d->dma_ops)
1390 hwif->dma_ops = d->dma_ops;
1393 if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1394 ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base))
1395 hwif->host->host_flags |= IDE_HFLAG_SERIALIZE;
1398 hwif->rqsize = d->max_sectors;
1400 /* call chipset specific routine for each enabled port */
1405 static void ide_port_cable_detect(ide_hwif_t *hwif)
1407 const struct ide_port_ops *port_ops = hwif->port_ops;
1409 if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1410 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1411 hwif->cbl = port_ops->cable_detect(hwif);
1415 static ssize_t store_delete_devices(struct device *portdev,
1416 struct device_attribute *attr,
1417 const char *buf, size_t n)
1419 ide_hwif_t *hwif = dev_get_drvdata(portdev);
1421 if (strncmp(buf, "1", n))
1424 ide_port_unregister_devices(hwif);
1429 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1431 static ssize_t store_scan(struct device *portdev,
1432 struct device_attribute *attr,
1433 const char *buf, size_t n)
1435 ide_hwif_t *hwif = dev_get_drvdata(portdev);
1437 if (strncmp(buf, "1", n))
1440 ide_port_unregister_devices(hwif);
1441 ide_port_scan(hwif);
1446 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1448 static struct device_attribute *ide_port_attrs[] = {
1449 &dev_attr_delete_devices,
1454 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1456 int i, uninitialized_var(rc);
1458 for (i = 0; ide_port_attrs[i]; i++) {
1459 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1467 static unsigned int ide_indexes;
1470 * ide_find_port_slot - find free port slot
1473 * Return the new port slot index or -ENOENT if we are out of free slots.
1476 static int ide_find_port_slot(const struct ide_port_info *d)
1479 u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1480 u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1483 * Claim an unassigned slot.
1485 * Give preference to claiming other slots before claiming ide0/ide1,
1486 * just in case there's another interface yet-to-be-scanned
1487 * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1489 * Unless there is a bootable card that does not use the standard
1490 * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1492 mutex_lock(&ide_cfg_mtx);
1494 if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1495 idx = ffz(ide_indexes | i);
1497 if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1498 idx = ffz(ide_indexes | 3);
1499 else if ((ide_indexes & 3) != 3)
1500 idx = ffz(ide_indexes);
1503 ide_indexes |= (1 << idx);
1504 mutex_unlock(&ide_cfg_mtx);
1509 static void ide_free_port_slot(int idx)
1511 mutex_lock(&ide_cfg_mtx);
1512 ide_indexes &= ~(1 << idx);
1513 mutex_unlock(&ide_cfg_mtx);
1516 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1518 struct ide_host *host;
1521 host = kzalloc(sizeof(*host), GFP_KERNEL);
1525 for (i = 0; i < MAX_HOST_PORTS; i++) {
1532 hwif = kzalloc(sizeof(*hwif), GFP_KERNEL);
1536 idx = ide_find_port_slot(d);
1538 printk(KERN_ERR "%s: no free slot for interface\n",
1539 d ? d->name : "ide");
1544 ide_init_port_data(hwif, idx);
1548 host->ports[i] = hwif;
1552 if (host->n_ports == 0) {
1558 host->dev[0] = hws[0]->dev;
1561 host->init_chipset = d->init_chipset;
1562 host->host_flags = d->host_flags;
1567 EXPORT_SYMBOL_GPL(ide_host_alloc);
1569 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1572 ide_hwif_t *hwif, *mate = NULL;
1575 for (i = 0; i < MAX_HOST_PORTS; i++) {
1576 hwif = host->ports[i];
1583 ide_init_port_hw(hwif, hws[i]);
1584 ide_port_apply_params(hwif);
1589 if ((i & 1) && mate) {
1594 mate = (i & 1) ? NULL : hwif;
1596 ide_init_port(hwif, i & 1, d);
1597 ide_port_cable_detect(hwif);
1600 ide_port_init_devices(hwif);
1603 for (i = 0; i < MAX_HOST_PORTS; i++) {
1604 hwif = host->ports[i];
1609 if (ide_probe_port(hwif) == 0)
1612 if (hwif->chipset != ide_4drives || !hwif->mate ||
1613 !hwif->mate->present)
1614 ide_register_port(hwif);
1617 ide_port_tune_devices(hwif);
1620 for (i = 0; i < MAX_HOST_PORTS; i++) {
1621 hwif = host->ports[i];
1626 if (hwif_init(hwif) == 0) {
1627 printk(KERN_INFO "%s: failed to initialize IDE "
1628 "interface\n", hwif->name);
1634 if (ide_port_setup_devices(hwif) == 0) {
1641 ide_acpi_init(hwif);
1644 ide_acpi_port_init_devices(hwif);
1647 for (i = 0; i < MAX_HOST_PORTS; i++) {
1648 hwif = host->ports[i];
1654 hwif_register_devices(hwif);
1657 for (i = 0; i < MAX_HOST_PORTS; i++) {
1658 hwif = host->ports[i];
1663 ide_sysfs_register_port(hwif);
1664 ide_proc_register_port(hwif);
1667 ide_proc_port_register_devices(hwif);
1672 EXPORT_SYMBOL_GPL(ide_host_register);
1674 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1675 struct ide_host **hostp)
1677 struct ide_host *host;
1680 host = ide_host_alloc(d, hws);
1684 rc = ide_host_register(host, d, hws);
1686 ide_host_free(host);
1695 EXPORT_SYMBOL_GPL(ide_host_add);
1697 void ide_host_free(struct ide_host *host)
1702 for (i = 0; i < MAX_HOST_PORTS; i++) {
1703 hwif = host->ports[i];
1708 ide_free_port_slot(hwif->index);
1714 EXPORT_SYMBOL_GPL(ide_host_free);
1716 void ide_host_remove(struct ide_host *host)
1720 for (i = 0; i < MAX_HOST_PORTS; i++) {
1722 ide_unregister(host->ports[i]);
1725 ide_host_free(host);
1727 EXPORT_SYMBOL_GPL(ide_host_remove);
1729 void ide_port_scan(ide_hwif_t *hwif)
1731 ide_port_apply_params(hwif);
1732 ide_port_cable_detect(hwif);
1733 ide_port_init_devices(hwif);
1735 if (ide_probe_port(hwif) < 0)
1740 ide_port_tune_devices(hwif);
1741 ide_acpi_port_init_devices(hwif);
1742 ide_port_setup_devices(hwif);
1743 hwif_register_devices(hwif);
1744 ide_proc_port_register_devices(hwif);
1746 EXPORT_SYMBOL_GPL(ide_port_scan);