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->tp_ops->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 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
271 int use_altstatus = 0, rc;
272 unsigned long timeout;
275 /* take a deep breath */
278 if (io_ports->ctl_addr) {
279 a = tp_ops->read_altstatus(hwif);
280 s = tp_ops->read_status(hwif);
281 if ((a ^ s) & ~INDEX_STAT)
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 == WIN_PIDENTIFY) {
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 == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
310 if (time_after(jiffies, timeout)) {
311 /* drive timed-out */
314 /* give drive a breather */
316 s = use_altstatus ? tp_ops->read_altstatus(hwif)
317 : tp_ops->read_status(hwif);
318 } while (s & BUSY_STAT);
320 /* wait for IRQ and DRQ_STAT */
322 s = tp_ops->read_status(hwif);
324 if (OK_STAT(s, DRQ_STAT, BAD_R_STAT)) {
327 /* local CPU only; some systems need this */
328 local_irq_save(flags);
329 /* drive returned ID */
330 do_identify(drive, cmd);
331 /* drive responded with ID */
333 /* clear drive IRQ */
334 (void)tp_ops->read_status(hwif);
335 local_irq_restore(flags);
337 /* drive refused ID */
344 * try_to_identify - try to identify a drive
345 * @drive: drive to probe
346 * @cmd: command to use
348 * Issue the identify command and then do IRQ probing to
349 * complete the identification when needed by finding the
350 * IRQ the drive is attached to
353 static int try_to_identify (ide_drive_t *drive, u8 cmd)
355 ide_hwif_t *hwif = HWIF(drive);
356 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
359 unsigned long cookie = 0;
362 * Disable device irq unless we need to
363 * probe for it. Otherwise we'll get spurious
364 * interrupts during the identify-phase that
365 * the irq handler isn't expecting.
367 if (hwif->io_ports.ctl_addr) {
370 cookie = probe_irq_on();
372 tp_ops->set_irq(hwif, autoprobe);
375 retval = actual_try_to_identify(drive, cmd);
380 tp_ops->set_irq(hwif, 0);
381 /* clear drive IRQ */
382 (void)tp_ops->read_status(hwif);
384 irq = probe_irq_off(cookie);
389 /* Mmmm.. multiple IRQs..
390 * don't know which was ours
392 printk("%s: IRQ probe failed (0x%lx)\n",
393 drive->name, cookie);
400 static int ide_busy_sleep(ide_hwif_t *hwif)
402 unsigned long timeout = jiffies + WAIT_WORSTCASE;
407 stat = hwif->tp_ops->read_status(hwif);
408 if ((stat & BUSY_STAT) == 0)
410 } while (time_before(jiffies, timeout));
415 static u8 ide_read_device(ide_drive_t *drive)
419 memset(&task, 0, sizeof(task));
420 task.tf_flags = IDE_TFLAG_IN_DEVICE;
422 drive->hwif->tp_ops->tf_read(drive, &task);
424 return task.tf.device;
428 * do_probe - probe an IDE device
429 * @drive: drive to probe
430 * @cmd: command to use
432 * do_probe() has the difficult job of finding a drive if it exists,
433 * without getting hung up if it doesn't exist, without trampling on
434 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
436 * If a drive is "known" to exist (from CMOS or kernel parameters),
437 * but does not respond right away, the probe will "hang in there"
438 * for the maximum wait time (about 30 seconds), otherwise it will
439 * exit much more quickly.
441 * Returns: 0 device was identified
442 * 1 device timed-out (no response to identify request)
443 * 2 device aborted the command (refused to identify itself)
444 * 3 bad status from device (possible for ATAPI drives)
445 * 4 probe was not attempted because failure was obvious
448 static int do_probe (ide_drive_t *drive, u8 cmd)
450 ide_hwif_t *hwif = HWIF(drive);
451 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
455 if (drive->present) {
456 /* avoid waiting for inappropriate probes */
457 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
461 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
462 drive->name, drive->present, drive->media,
463 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
466 /* needed for some systems
467 * (e.g. crw9624 as drive0 with disk as slave)
473 if (ide_read_device(drive) != drive->select.all && !drive->present) {
474 if (drive->select.b.unit != 0) {
475 /* exit with drive0 selected */
476 SELECT_DRIVE(&hwif->drives[0]);
477 /* allow BUSY_STAT to assert & clear */
480 /* no i/f present: mmm.. this should be a 4 -ml */
484 stat = tp_ops->read_status(hwif);
486 if (OK_STAT(stat, READY_STAT, BUSY_STAT) ||
487 drive->present || cmd == WIN_PIDENTIFY) {
488 /* send cmd and wait */
489 if ((rc = try_to_identify(drive, cmd))) {
490 /* failed: try again */
491 rc = try_to_identify(drive,cmd);
494 stat = tp_ops->read_status(hwif);
496 if (stat == (BUSY_STAT | READY_STAT))
499 if (rc == 1 && cmd == WIN_PIDENTIFY) {
500 printk(KERN_ERR "%s: no response (status = 0x%02x), "
501 "resetting drive\n", drive->name, stat);
505 tp_ops->exec_command(hwif, WIN_SRST);
506 (void)ide_busy_sleep(hwif);
507 rc = try_to_identify(drive, cmd);
510 /* ensure drive IRQ is clear */
511 stat = tp_ops->read_status(hwif);
514 printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
517 /* not present or maybe ATAPI */
520 if (drive->select.b.unit != 0) {
521 /* exit with drive0 selected */
522 SELECT_DRIVE(&hwif->drives[0]);
524 /* ensure drive irq is clear */
525 (void)tp_ops->read_status(hwif);
533 static void enable_nest (ide_drive_t *drive)
535 ide_hwif_t *hwif = HWIF(drive);
536 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
539 printk("%s: enabling %s -- ", hwif->name, drive->id->model);
542 tp_ops->exec_command(hwif, EXABYTE_ENABLE_NEST);
544 if (ide_busy_sleep(hwif)) {
545 printk(KERN_CONT "failed (timeout)\n");
551 stat = tp_ops->read_status(hwif);
553 if (!OK_STAT(stat, 0, BAD_STAT))
554 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
556 printk(KERN_CONT "success\n");
558 /* if !(success||timed-out) */
559 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
560 /* look for ATAPI device */
561 (void) do_probe(drive, WIN_PIDENTIFY);
566 * probe_for_drives - upper level drive probe
567 * @drive: drive to probe for
569 * probe_for_drive() tests for existence of a given drive using do_probe()
570 * and presents things to the user as needed.
572 * Returns: 0 no device was found
573 * 1 device was found (note: drive->present might
577 static inline u8 probe_for_drive (ide_drive_t *drive)
580 * In order to keep things simple we have an id
581 * block for all drives at all times. If the device
582 * is pre ATA or refuses ATA/ATAPI identify we
583 * will add faked data to this.
585 * Also note that 0 everywhere means "can't do X"
588 drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
590 if(drive->id == NULL)
592 printk(KERN_ERR "ide: out of memory for id data.\n");
595 strcpy(drive->id->model, "UNKNOWN");
600 /* if !(success||timed-out) */
601 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
602 /* look for ATAPI device */
603 (void) do_probe(drive, WIN_PIDENTIFY);
606 /* drive not found */
608 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
611 /* identification failed? */
612 if (!drive->id_read) {
613 if (drive->media == ide_disk) {
614 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
615 drive->name, drive->cyl,
616 drive->head, drive->sect);
617 } else if (drive->media == ide_cdrom) {
618 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
621 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
625 /* drive was found */
629 /* The drive wasn't being helpful. Add generic info only */
630 if (drive->id_read == 0) {
635 if (drive->media == ide_disk) {
636 ide_disk_init_chs(drive);
637 ide_disk_init_mult_count(drive);
640 return drive->present;
643 static void hwif_release_dev (struct device *dev)
645 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
647 complete(&hwif->gendev_rel_comp);
650 static int ide_register_port(ide_hwif_t *hwif)
654 /* register with global device tree */
655 strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
656 hwif->gendev.driver_data = hwif;
657 if (hwif->gendev.parent == NULL) {
659 hwif->gendev.parent = hwif->dev;
661 /* Would like to do = &device_legacy */
662 hwif->gendev.parent = NULL;
664 hwif->gendev.release = hwif_release_dev;
665 ret = device_register(&hwif->gendev);
667 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
672 hwif->portdev = device_create_drvdata(ide_port_class, &hwif->gendev,
673 MKDEV(0, 0), hwif, hwif->name);
674 if (IS_ERR(hwif->portdev)) {
675 ret = PTR_ERR(hwif->portdev);
676 device_unregister(&hwif->gendev);
683 * ide_port_wait_ready - wait for port to become ready
686 * This is needed on some PPCs and a bunch of BIOS-less embedded
687 * platforms. Typical cases are:
689 * - The firmware hard reset the disk before booting the kernel,
690 * the drive is still doing it's poweron-reset sequence, that
691 * can take up to 30 seconds.
693 * - The firmware does nothing (or no firmware), the device is
694 * still in POST state (same as above actually).
696 * - Some CD/DVD/Writer combo drives tend to drive the bus during
697 * their reset sequence even when they are non-selected slave
698 * devices, thus preventing discovery of the main HD.
700 * Doing this wait-for-non-busy should not harm any existing
701 * configuration and fix some issues like the above.
705 * Returns 0 on success, error code (< 0) otherwise.
708 static int ide_port_wait_ready(ide_hwif_t *hwif)
712 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
714 /* Let HW settle down a bit from whatever init state we
718 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
719 * I know of at least one disk who takes 31 seconds, I use 35
722 rc = ide_wait_not_busy(hwif, 35000);
726 /* Now make sure both master & slave are ready */
727 for (unit = 0; unit < MAX_DRIVES; unit++) {
728 ide_drive_t *drive = &hwif->drives[unit];
730 /* Ignore disks that we will not probe for later. */
731 if (!drive->noprobe || drive->present) {
733 hwif->tp_ops->set_irq(hwif, 1);
735 rc = ide_wait_not_busy(hwif, 35000);
739 printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
743 /* Exit function with master reselected (let's be sane) */
745 SELECT_DRIVE(&hwif->drives[0]);
751 * ide_undecoded_slave - look for bad CF adapters
754 * Analyse the drives on the interface and attempt to decide if we
755 * have the same drive viewed twice. This occurs with crap CF adapters
756 * and PCMCIA sometimes.
759 void ide_undecoded_slave(ide_drive_t *drive1)
761 ide_drive_t *drive0 = &drive1->hwif->drives[0];
763 if ((drive1->dn & 1) == 0 || drive0->present == 0)
766 /* If the models don't match they are not the same product */
767 if (strcmp(drive0->id->model, drive1->id->model))
770 /* Serial numbers do not match */
771 if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
774 /* No serial number, thankfully very rare for CF */
775 if (drive0->id->serial_no[0] == 0)
778 /* Appears to be an IDE flash adapter with decode bugs */
779 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
784 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
786 static int ide_probe_port(ide_hwif_t *hwif)
790 int unit, rc = -ENODEV;
792 BUG_ON(hwif->present);
794 if (hwif->drives[0].noprobe && hwif->drives[1].noprobe)
798 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
799 * we'll install our IRQ driver much later...
803 disable_irq(hwif->irq);
805 local_irq_set(flags);
807 if (ide_port_wait_ready(hwif) == -EBUSY)
808 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
811 * Second drive should only exist if first drive was found,
812 * but a lot of cdrom drives are configured as single slaves.
814 for (unit = 0; unit < MAX_DRIVES; ++unit) {
815 ide_drive_t *drive = &hwif->drives[unit];
816 drive->dn = (hwif->channel ? 2 : 0) + unit;
817 (void) probe_for_drive(drive);
822 local_irq_restore(flags);
825 * Use cached IRQ number. It might be (and is...) changed by probe
834 static void ide_port_tune_devices(ide_hwif_t *hwif)
836 const struct ide_port_ops *port_ops = hwif->port_ops;
839 for (unit = 0; unit < MAX_DRIVES; unit++) {
840 ide_drive_t *drive = &hwif->drives[unit];
842 if (drive->present && port_ops && port_ops->quirkproc)
843 port_ops->quirkproc(drive);
846 for (unit = 0; unit < MAX_DRIVES; ++unit) {
847 ide_drive_t *drive = &hwif->drives[unit];
849 if (drive->present) {
850 ide_set_max_pio(drive);
859 for (unit = 0; unit < MAX_DRIVES; ++unit) {
860 ide_drive_t *drive = &hwif->drives[unit];
862 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
863 drive->no_io_32bit = 1;
865 drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
871 * save_match() is used to simplify logic in init_irq() below.
873 * A loophole here is that we may not know about a particular
874 * hwif's irq until after that hwif is actually probed/initialized..
875 * This could be a problem for the case where an hwif is on a
876 * dual interface that requires serialization (eg. cmd640) and another
877 * hwif using one of the same irqs is initialized beforehand.
879 * This routine detects and reports such situations, but does not fix them.
881 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
883 ide_hwif_t *m = *match;
885 if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
888 printk("%s: potential irq problem with %s and %s\n",
889 hwif->name, new->name, m->name);
891 if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
894 #endif /* MAX_HWIFS > 1 */
899 static int ide_init_queue(ide_drive_t *drive)
901 struct request_queue *q;
902 ide_hwif_t *hwif = HWIF(drive);
903 int max_sectors = 256;
904 int max_sg_entries = PRD_ENTRIES;
907 * Our default set up assumes the normal IDE case,
908 * that is 64K segmenting, standard PRD setup
909 * and LBA28. Some drivers then impose their own
910 * limits and LBA48 we could raise it but as yet
914 q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
918 q->queuedata = drive;
919 blk_queue_segment_boundary(q, 0xffff);
921 if (hwif->rqsize < max_sectors)
922 max_sectors = hwif->rqsize;
923 blk_queue_max_sectors(q, max_sectors);
926 /* When we have an IOMMU, we may have a problem where pci_map_sg()
927 * creates segments that don't completely match our boundary
928 * requirements and thus need to be broken up again. Because it
929 * doesn't align properly either, we may actually have to break up
930 * to more segments than what was we got in the first place, a max
931 * worst case is twice as many.
932 * This will be fixed once we teach pci_map_sg() about our boundary
933 * requirements, hopefully soon. *FIXME*
935 if (!PCI_DMA_BUS_IS_PHYS)
936 max_sg_entries >>= 1;
937 #endif /* CONFIG_PCI */
939 blk_queue_max_hw_segments(q, max_sg_entries);
940 blk_queue_max_phys_segments(q, max_sg_entries);
942 /* assign drive queue */
945 /* needs drive->queue to be set */
946 ide_toggle_bounce(drive, 1);
951 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
953 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
955 spin_lock_irq(&ide_lock);
956 if (!hwgroup->drive) {
957 /* first drive for hwgroup. */
959 hwgroup->drive = drive;
960 hwgroup->hwif = HWIF(hwgroup->drive);
962 drive->next = hwgroup->drive->next;
963 hwgroup->drive->next = drive;
965 spin_unlock_irq(&ide_lock);
969 * For any present drive:
970 * - allocate the block device queue
971 * - link drive into the hwgroup
973 static void ide_port_setup_devices(ide_hwif_t *hwif)
977 mutex_lock(&ide_cfg_mtx);
978 for (i = 0; i < MAX_DRIVES; i++) {
979 ide_drive_t *drive = &hwif->drives[i];
984 if (ide_init_queue(drive)) {
985 printk(KERN_ERR "ide: failed to init %s\n",
990 ide_add_drive_to_hwgroup(drive);
992 mutex_unlock(&ide_cfg_mtx);
996 * This routine sets up the irq for an ide interface, and creates a new
997 * hwgroup for the irq/hwif if none was previously assigned.
999 * Much of the code is for correctly detecting/handling irq sharing
1000 * and irq serialization situations. This is somewhat complex because
1001 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1003 static int init_irq (ide_hwif_t *hwif)
1005 struct ide_io_ports *io_ports = &hwif->io_ports;
1007 ide_hwgroup_t *hwgroup;
1008 ide_hwif_t *match = NULL;
1011 BUG_ON(in_interrupt());
1012 BUG_ON(irqs_disabled());
1013 BUG_ON(hwif == NULL);
1015 mutex_lock(&ide_cfg_mtx);
1016 hwif->hwgroup = NULL;
1019 * Group up with any other hwifs that share our irq(s).
1021 for (index = 0; index < MAX_HWIFS; index++) {
1022 ide_hwif_t *h = &ide_hwifs[index];
1023 if (h->hwgroup) { /* scan only initialized hwif's */
1024 if (hwif->irq == h->irq) {
1025 hwif->sharing_irq = h->sharing_irq = 1;
1026 if (hwif->chipset != ide_pci ||
1027 h->chipset != ide_pci) {
1028 save_match(hwif, h, &match);
1031 if (hwif->serialized) {
1032 if (hwif->mate && hwif->mate->irq == h->irq)
1033 save_match(hwif, h, &match);
1035 if (h->serialized) {
1036 if (h->mate && hwif->irq == h->mate->irq)
1037 save_match(hwif, h, &match);
1041 #endif /* MAX_HWIFS > 1 */
1043 * If we are still without a hwgroup, then form a new one
1046 hwgroup = match->hwgroup;
1047 hwif->hwgroup = hwgroup;
1049 * Link us into the hwgroup.
1050 * This must be done early, do ensure that unexpected_intr
1051 * can find the hwif and prevent irq storms.
1052 * No drives are attached to the new hwif, choose_drive
1053 * can't do anything stupid (yet).
1054 * Add ourself as the 2nd entry to the hwgroup->hwif
1055 * linked list, the first entry is the hwif that owns
1056 * hwgroup->handler - do not change that.
1058 spin_lock_irq(&ide_lock);
1059 hwif->next = hwgroup->hwif->next;
1060 hwgroup->hwif->next = hwif;
1061 BUG_ON(hwif->next == hwif);
1062 spin_unlock_irq(&ide_lock);
1064 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1065 hwif_to_node(hwif));
1066 if (hwgroup == NULL)
1069 hwif->hwgroup = hwgroup;
1070 hwgroup->hwif = hwif->next = hwif;
1072 init_timer(&hwgroup->timer);
1073 hwgroup->timer.function = &ide_timer_expiry;
1074 hwgroup->timer.data = (unsigned long) hwgroup;
1078 * Allocate the irq, if not already obtained for another hwif
1080 if (!match || match->irq != hwif->irq) {
1082 #if defined(__mc68000__)
1084 #endif /* __mc68000__ */
1086 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1089 if (io_ports->ctl_addr)
1090 hwif->tp_ops->set_irq(hwif, 1);
1092 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1096 if (!hwif->rqsize) {
1097 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1098 (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1101 hwif->rqsize = 65536;
1104 #if !defined(__mc68000__)
1105 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1106 io_ports->data_addr, io_ports->status_addr,
1107 io_ports->ctl_addr, hwif->irq);
1109 printk("%s at 0x%08lx on irq %d", hwif->name,
1110 io_ports->data_addr, hwif->irq);
1111 #endif /* __mc68000__ */
1113 printk(" (%sed with %s)",
1114 hwif->sharing_irq ? "shar" : "serializ", match->name);
1117 mutex_unlock(&ide_cfg_mtx);
1120 ide_remove_port_from_hwgroup(hwif);
1122 mutex_unlock(&ide_cfg_mtx);
1126 static int ata_lock(dev_t dev, void *data)
1128 /* FIXME: we want to pin hwif down */
1132 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1134 ide_hwif_t *hwif = data;
1135 int unit = *part >> PARTN_BITS;
1136 ide_drive_t *drive = &hwif->drives[unit];
1137 if (!drive->present)
1140 if (drive->media == ide_disk)
1141 request_module("ide-disk");
1143 request_module("ide-scsi");
1144 if (drive->media == ide_cdrom || drive->media == ide_optical)
1145 request_module("ide-cd");
1146 if (drive->media == ide_tape)
1147 request_module("ide-tape");
1148 if (drive->media == ide_floppy)
1149 request_module("ide-floppy");
1154 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1156 struct gendisk *p = data;
1157 *part &= (1 << PARTN_BITS) - 1;
1158 return &p->dev.kobj;
1161 static int exact_lock(dev_t dev, void *data)
1163 struct gendisk *p = data;
1170 void ide_register_region(struct gendisk *disk)
1172 blk_register_region(MKDEV(disk->major, disk->first_minor),
1173 disk->minors, NULL, exact_match, exact_lock, disk);
1176 EXPORT_SYMBOL_GPL(ide_register_region);
1178 void ide_unregister_region(struct gendisk *disk)
1180 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1184 EXPORT_SYMBOL_GPL(ide_unregister_region);
1186 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1188 ide_hwif_t *hwif = drive->hwif;
1189 unsigned int unit = (drive->select.all >> 4) & 1;
1191 disk->major = hwif->major;
1192 disk->first_minor = unit << PARTN_BITS;
1193 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1194 disk->queue = drive->queue;
1197 EXPORT_SYMBOL_GPL(ide_init_disk);
1199 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1201 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1203 if (drive == drive->next) {
1204 /* special case: last drive from hwgroup. */
1205 BUG_ON(hwgroup->drive != drive);
1206 hwgroup->drive = NULL;
1210 walk = hwgroup->drive;
1211 while (walk->next != drive)
1213 walk->next = drive->next;
1214 if (hwgroup->drive == drive) {
1215 hwgroup->drive = drive->next;
1216 hwgroup->hwif = hwgroup->drive->hwif;
1219 BUG_ON(hwgroup->drive == drive);
1222 static void drive_release_dev (struct device *dev)
1224 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1226 ide_proc_unregister_device(drive);
1228 spin_lock_irq(&ide_lock);
1229 ide_remove_drive_from_hwgroup(drive);
1233 /* Messed up locking ... */
1234 spin_unlock_irq(&ide_lock);
1235 blk_cleanup_queue(drive->queue);
1236 spin_lock_irq(&ide_lock);
1237 drive->queue = NULL;
1238 spin_unlock_irq(&ide_lock);
1240 complete(&drive->gendev_rel_comp);
1243 static int hwif_init(ide_hwif_t *hwif)
1248 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1250 printk("%s: DISABLED, NO IRQ\n", hwif->name);
1255 if (register_blkdev(hwif->major, hwif->name))
1258 if (!hwif->sg_max_nents)
1259 hwif->sg_max_nents = PRD_ENTRIES;
1261 hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1263 if (!hwif->sg_table) {
1264 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1268 sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1270 if (init_irq(hwif) == 0)
1273 old_irq = hwif->irq;
1275 * It failed to initialise. Find the default IRQ for
1276 * this port and try that.
1278 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1280 printk("%s: Disabled unable to get IRQ %d.\n",
1281 hwif->name, old_irq);
1284 if (init_irq(hwif)) {
1285 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1286 hwif->name, old_irq, hwif->irq);
1289 printk("%s: probed IRQ %d failed, using default.\n",
1290 hwif->name, hwif->irq);
1293 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1294 THIS_MODULE, ata_probe, ata_lock, hwif);
1298 unregister_blkdev(hwif->major, hwif->name);
1302 static void hwif_register_devices(ide_hwif_t *hwif)
1306 for (i = 0; i < MAX_DRIVES; i++) {
1307 ide_drive_t *drive = &hwif->drives[i];
1308 struct device *dev = &drive->gendev;
1311 if (!drive->present)
1314 ide_add_generic_settings(drive);
1316 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1317 dev->parent = &hwif->gendev;
1318 dev->bus = &ide_bus_type;
1319 dev->driver_data = drive;
1320 dev->release = drive_release_dev;
1322 ret = device_register(dev);
1324 printk(KERN_WARNING "IDE: %s: device_register error: "
1325 "%d\n", __func__, ret);
1329 static void ide_port_init_devices(ide_hwif_t *hwif)
1331 const struct ide_port_ops *port_ops = hwif->port_ops;
1334 for (i = 0; i < MAX_DRIVES; i++) {
1335 ide_drive_t *drive = &hwif->drives[i];
1337 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1338 drive->io_32bit = 1;
1339 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1341 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1342 drive->no_unmask = 1;
1344 if (port_ops && port_ops->init_dev)
1345 port_ops->init_dev(drive);
1349 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1350 const struct ide_port_info *d)
1352 hwif->channel = port;
1355 hwif->chipset = d->chipset;
1360 if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1361 (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1362 hwif->irq = port ? 15 : 14;
1364 /* ->host_flags may be set by ->init_iops (or even earlier...) */
1365 hwif->host_flags |= d->host_flags;
1366 hwif->pio_mask = d->pio_mask;
1369 hwif->tp_ops = d->tp_ops;
1371 /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1372 if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1373 hwif->port_ops = d->port_ops;
1375 hwif->swdma_mask = d->swdma_mask;
1376 hwif->mwdma_mask = d->mwdma_mask;
1377 hwif->ultra_mask = d->udma_mask;
1379 if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1383 rc = d->init_dma(hwif, d);
1385 rc = ide_hwif_setup_dma(hwif, d);
1388 printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1390 hwif->swdma_mask = 0;
1391 hwif->mwdma_mask = 0;
1392 hwif->ultra_mask = 0;
1393 } else if (d->dma_ops)
1394 hwif->dma_ops = d->dma_ops;
1397 if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1398 ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1400 hwif->mate->serialized = hwif->serialized = 1;
1403 if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1406 /* call chipset specific routine for each enabled port */
1411 static void ide_port_cable_detect(ide_hwif_t *hwif)
1413 const struct ide_port_ops *port_ops = hwif->port_ops;
1415 if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1416 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1417 hwif->cbl = port_ops->cable_detect(hwif);
1421 static ssize_t store_delete_devices(struct device *portdev,
1422 struct device_attribute *attr,
1423 const char *buf, size_t n)
1425 ide_hwif_t *hwif = dev_get_drvdata(portdev);
1427 if (strncmp(buf, "1", n))
1430 ide_port_unregister_devices(hwif);
1435 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1437 static ssize_t store_scan(struct device *portdev,
1438 struct device_attribute *attr,
1439 const char *buf, size_t n)
1441 ide_hwif_t *hwif = dev_get_drvdata(portdev);
1443 if (strncmp(buf, "1", n))
1446 ide_port_unregister_devices(hwif);
1447 ide_port_scan(hwif);
1452 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1454 static struct device_attribute *ide_port_attrs[] = {
1455 &dev_attr_delete_devices,
1460 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1464 for (i = 0; ide_port_attrs[i]; i++) {
1465 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1474 * ide_find_port_slot - find free ide_hwifs[] slot
1477 * Return the new hwif. If we are out of free slots return NULL.
1480 static ide_hwif_t *ide_find_port_slot(const struct ide_port_info *d)
1484 u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1487 * Claim an unassigned slot.
1489 * Give preference to claiming other slots before claiming ide0/ide1,
1490 * just in case there's another interface yet-to-be-scanned
1491 * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1493 * Unless there is a bootable card that does not use the standard
1494 * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1497 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;
1499 for (; i < MAX_HWIFS; i++) {
1500 hwif = &ide_hwifs[i];
1501 if (hwif->chipset == ide_unknown)
1505 for (i = 2; i < MAX_HWIFS; i++) {
1506 hwif = &ide_hwifs[i];
1507 if (hwif->chipset == ide_unknown)
1510 for (i = 0; i < 2 && i < MAX_HWIFS; i++) {
1511 hwif = &ide_hwifs[i];
1512 if (hwif->chipset == ide_unknown)
1517 printk(KERN_ERR "%s: no free slot for interface\n",
1518 d ? d->name : "ide");
1523 ide_init_port_data(hwif, i);
1527 struct ide_host *ide_host_alloc_all(const struct ide_port_info *d,
1530 struct ide_host *host;
1533 host = kzalloc(sizeof(*host), GFP_KERNEL);
1537 for (i = 0; i < MAX_HWIFS; i++) {
1543 hwif = ide_find_port_slot(d);
1545 hwif->chipset = hws[i]->chipset;
1547 host->ports[i] = hwif;
1552 if (host->n_ports == 0) {
1559 EXPORT_SYMBOL_GPL(ide_host_alloc_all);
1561 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1563 hw_regs_t *hws_all[MAX_HWIFS];
1566 for (i = 0; i < MAX_HWIFS; i++)
1567 hws_all[i] = (i < 4) ? hws[i] : NULL;
1569 return ide_host_alloc_all(d, hws_all);
1571 EXPORT_SYMBOL_GPL(ide_host_alloc);
1573 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1576 ide_hwif_t *hwif, *mate = NULL;
1580 for (i = 0; i < MAX_HWIFS; i++) {
1581 idx[i] = host->ports[i] ? host->ports[i]->index : 0xff;
1583 if (idx[i] == 0xff) {
1588 hwif = &ide_hwifs[idx[i]];
1590 ide_init_port_hw(hwif, hws[i]);
1591 ide_port_apply_params(hwif);
1598 if ((i & 1) && mate) {
1603 mate = (i & 1) ? NULL : hwif;
1605 ide_init_port(hwif, i & 1, d);
1606 ide_port_cable_detect(hwif);
1607 ide_port_init_devices(hwif);
1610 for (i = 0; i < MAX_HWIFS; i++) {
1614 hwif = &ide_hwifs[idx[i]];
1616 if (ide_probe_port(hwif) == 0)
1619 if (hwif->chipset != ide_4drives || !hwif->mate ||
1620 !hwif->mate->present)
1621 ide_register_port(hwif);
1624 ide_port_tune_devices(hwif);
1627 for (i = 0; i < MAX_HWIFS; i++) {
1631 hwif = &ide_hwifs[idx[i]];
1633 if (hwif_init(hwif) == 0) {
1634 printk(KERN_INFO "%s: failed to initialize IDE "
1635 "interface\n", hwif->name);
1642 ide_port_setup_devices(hwif);
1644 ide_acpi_init(hwif);
1647 ide_acpi_port_init_devices(hwif);
1650 for (i = 0; i < MAX_HWIFS; i++) {
1654 hwif = &ide_hwifs[idx[i]];
1656 if (hwif->chipset == ide_unknown)
1657 hwif->chipset = ide_generic;
1660 hwif_register_devices(hwif);
1663 for (i = 0; i < MAX_HWIFS; i++) {
1667 hwif = &ide_hwifs[idx[i]];
1669 ide_sysfs_register_port(hwif);
1670 ide_proc_register_port(hwif);
1673 ide_proc_port_register_devices(hwif);
1678 EXPORT_SYMBOL_GPL(ide_host_register);
1680 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1681 struct ide_host **hostp)
1683 struct ide_host *host;
1685 host = ide_host_alloc(d, hws);
1689 ide_host_register(host, d, hws);
1696 EXPORT_SYMBOL_GPL(ide_host_add);
1698 void ide_host_remove(struct ide_host *host)
1702 for (i = 0; i < MAX_HWIFS; i++) {
1704 ide_unregister(host->ports[i]);
1709 EXPORT_SYMBOL_GPL(ide_host_remove);
1711 void ide_port_scan(ide_hwif_t *hwif)
1713 ide_port_apply_params(hwif);
1714 ide_port_cable_detect(hwif);
1715 ide_port_init_devices(hwif);
1717 if (ide_probe_port(hwif) < 0)
1722 ide_port_tune_devices(hwif);
1723 ide_acpi_port_init_devices(hwif);
1724 ide_port_setup_devices(hwif);
1725 hwif_register_devices(hwif);
1726 ide_proc_port_register_devices(hwif);
1728 EXPORT_SYMBOL_GPL(ide_port_scan);
1730 static void ide_legacy_init_one(hw_regs_t **hws, hw_regs_t *hw,
1731 u8 port_no, const struct ide_port_info *d,
1732 unsigned long config)
1734 unsigned long base, ctl;
1747 if (!request_region(base, 8, d->name)) {
1748 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1749 d->name, base, base + 7);
1753 if (!request_region(ctl, 1, d->name)) {
1754 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1756 release_region(base, 8);
1760 ide_std_init_ports(hw, base, ctl);
1762 hw->chipset = d->chipset;
1763 hw->config = config;
1768 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1770 hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
1772 memset(&hw, 0, sizeof(hw));
1774 if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1775 ide_legacy_init_one(hws, &hw[0], 0, d, config);
1776 ide_legacy_init_one(hws, &hw[1], 1, d, config);
1778 if (hws[0] == NULL && hws[1] == NULL &&
1779 (d->host_flags & IDE_HFLAG_SINGLE))
1782 return ide_host_add(d, hws, NULL);
1784 EXPORT_SYMBOL_GPL(ide_legacy_device_add);