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_flags |= IDE_SFLAG_SET_MULTMODE;
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
184 * @id: buffer for IDENTIFY data
186 * Called when we have issued a drive identify command to
187 * read and parse the results. This function is run with
188 * interrupts disabled.
191 static void do_identify(ide_drive_t *drive, u8 cmd, u16 *id)
193 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"))
231 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
233 drive->dev_flags |= IDE_DFLAG_PRESENT;
237 * ide_dev_read_id - send ATA/ATAPI IDENTIFY command
238 * @drive: drive to identify
239 * @cmd: command to use
240 * @id: buffer for IDENTIFY data
242 * Sends an ATA(PI) IDENTIFY request to a drive and waits for a response.
244 * Returns: 0 device was identified
245 * 1 device timed-out (no response to identify request)
246 * 2 device aborted the command (refused to identify itself)
249 int ide_dev_read_id(ide_drive_t *drive, u8 cmd, u16 *id)
251 ide_hwif_t *hwif = drive->hwif;
252 struct ide_io_ports *io_ports = &hwif->io_ports;
253 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
254 int use_altstatus = 0, rc;
255 unsigned long timeout;
259 * Disable device IRQ. Otherwise we'll get spurious interrupts
260 * during the identify phase that the IRQ handler isn't expecting.
262 if (io_ports->ctl_addr)
263 tp_ops->write_devctl(hwif, ATA_NIEN | ATA_DEVCTL_OBS);
265 /* take a deep breath */
268 if (io_ports->ctl_addr &&
269 (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) {
270 a = tp_ops->read_altstatus(hwif);
271 s = tp_ops->read_status(hwif);
272 if ((a ^ s) & ~ATA_IDX)
273 /* ancient Seagate drives, broken interfaces */
274 printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
275 "instead of ALTSTATUS(0x%02x)\n",
278 /* use non-intrusive polling */
282 /* set features register for atapi
283 * identify command to be sure of reply
285 if (cmd == ATA_CMD_ID_ATAPI) {
286 struct ide_taskfile tf;
288 memset(&tf, 0, sizeof(tf));
289 /* disable DMA & overlap */
290 tp_ops->tf_load(drive, &tf, IDE_VALID_FEATURE);
293 /* ask drive for ID */
294 tp_ops->exec_command(hwif, cmd);
296 timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
298 if (ide_busy_sleep(drive, timeout, use_altstatus))
301 /* wait for IRQ and ATA_DRQ */
303 s = tp_ops->read_status(hwif);
305 if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
306 /* drive returned ID */
307 do_identify(drive, cmd, id);
308 /* drive responded with ID */
310 /* clear drive IRQ */
311 (void)tp_ops->read_status(hwif);
313 /* drive refused ID */
319 int ide_busy_sleep(ide_drive_t *drive, unsigned long timeout, int altstatus)
321 ide_hwif_t *hwif = drive->hwif;
327 msleep(50); /* give drive a breather */
328 stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
329 : hwif->tp_ops->read_status(hwif);
330 if ((stat & ATA_BUSY) == 0)
332 } while (time_before(jiffies, timeout));
334 printk(KERN_ERR "%s: timeout in %s\n", drive->name, __func__);
336 return 1; /* drive timed-out */
339 static u8 ide_read_device(ide_drive_t *drive)
341 struct ide_taskfile tf;
343 drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_DEVICE);
349 * do_probe - probe an IDE device
350 * @drive: drive to probe
351 * @cmd: command to use
353 * do_probe() has the difficult job of finding a drive if it exists,
354 * without getting hung up if it doesn't exist, without trampling on
355 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
357 * If a drive is "known" to exist (from CMOS or kernel parameters),
358 * but does not respond right away, the probe will "hang in there"
359 * for the maximum wait time (about 30 seconds), otherwise it will
360 * exit much more quickly.
362 * Returns: 0 device was identified
363 * 1 device timed-out (no response to identify request)
364 * 2 device aborted the command (refused to identify itself)
365 * 3 bad status from device (possible for ATAPI drives)
366 * 4 probe was not attempted because failure was obvious
369 static int do_probe (ide_drive_t *drive, u8 cmd)
371 ide_hwif_t *hwif = drive->hwif;
372 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
375 u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;
377 /* avoid waiting for inappropriate probes */
378 if (present && drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
382 printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
383 drive->name, present, drive->media,
384 (cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
387 /* needed for some systems
388 * (e.g. crw9624 as drive0 with disk as slave)
391 tp_ops->dev_select(drive);
394 if (ide_read_device(drive) != drive->select && present == 0) {
396 /* exit with drive0 selected */
397 tp_ops->dev_select(hwif->devices[0]);
398 /* allow ATA_BUSY to assert & clear */
401 /* no i/f present: mmm.. this should be a 4 -ml */
405 stat = tp_ops->read_status(hwif);
407 if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
408 present || cmd == ATA_CMD_ID_ATAPI) {
409 rc = ide_dev_read_id(drive, cmd, id);
411 /* failed: try again */
412 rc = ide_dev_read_id(drive, cmd, id);
414 stat = tp_ops->read_status(hwif);
416 if (stat == (ATA_BUSY | ATA_DRDY))
419 if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
420 printk(KERN_ERR "%s: no response (status = 0x%02x), "
421 "resetting drive\n", drive->name, stat);
423 tp_ops->dev_select(drive);
425 tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
426 (void)ide_busy_sleep(drive, WAIT_WORSTCASE, 0);
427 rc = ide_dev_read_id(drive, cmd, id);
430 /* ensure drive IRQ is clear */
431 stat = tp_ops->read_status(hwif);
434 printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
437 /* not present or maybe ATAPI */
441 /* exit with drive0 selected */
442 tp_ops->dev_select(hwif->devices[0]);
444 /* ensure drive irq is clear */
445 (void)tp_ops->read_status(hwif);
451 * probe_for_drives - upper level drive probe
452 * @drive: drive to probe for
454 * probe_for_drive() tests for existence of a given drive using do_probe()
455 * and presents things to the user as needed.
457 * Returns: 0 no device was found
459 * (note: IDE_DFLAG_PRESENT might still be not set)
462 static u8 probe_for_drive(ide_drive_t *drive)
468 drive->dev_flags &= ~IDE_DFLAG_ID_READ;
470 m = (char *)&drive->id[ATA_ID_PROD];
471 strcpy(m, "UNKNOWN");
474 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) {
475 /* if !(success||timed-out) */
476 cmd = ATA_CMD_ID_ATA;
477 rc = do_probe(drive, cmd);
479 /* look for ATAPI device */
480 cmd = ATA_CMD_ID_ATAPI;
481 rc = do_probe(drive, cmd);
484 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
487 /* identification failed? */
488 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
489 if (drive->media == ide_disk) {
490 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
491 drive->name, drive->cyl,
492 drive->head, drive->sect);
493 } else if (drive->media == ide_cdrom) {
494 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
497 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
498 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
501 if (cmd == ATA_CMD_ID_ATAPI)
502 ide_classify_atapi_dev(drive);
504 ide_classify_ata_dev(drive);
508 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
511 /* The drive wasn't being helpful. Add generic info only */
512 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
517 if (drive->media == ide_disk) {
518 ide_disk_init_chs(drive);
519 ide_disk_init_mult_count(drive);
525 static void hwif_release_dev(struct device *dev)
527 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
529 complete(&hwif->gendev_rel_comp);
532 static int ide_register_port(ide_hwif_t *hwif)
536 /* register with global device tree */
537 dev_set_name(&hwif->gendev, hwif->name);
538 dev_set_drvdata(&hwif->gendev, hwif);
539 if (hwif->gendev.parent == NULL)
540 hwif->gendev.parent = hwif->dev;
541 hwif->gendev.release = hwif_release_dev;
543 ret = device_register(&hwif->gendev);
545 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
550 hwif->portdev = device_create(ide_port_class, &hwif->gendev,
551 MKDEV(0, 0), hwif, hwif->name);
552 if (IS_ERR(hwif->portdev)) {
553 ret = PTR_ERR(hwif->portdev);
554 device_unregister(&hwif->gendev);
561 * ide_port_wait_ready - wait for port to become ready
564 * This is needed on some PPCs and a bunch of BIOS-less embedded
565 * platforms. Typical cases are:
567 * - The firmware hard reset the disk before booting the kernel,
568 * the drive is still doing it's poweron-reset sequence, that
569 * can take up to 30 seconds.
571 * - The firmware does nothing (or no firmware), the device is
572 * still in POST state (same as above actually).
574 * - Some CD/DVD/Writer combo drives tend to drive the bus during
575 * their reset sequence even when they are non-selected slave
576 * devices, thus preventing discovery of the main HD.
578 * Doing this wait-for-non-busy should not harm any existing
579 * configuration and fix some issues like the above.
583 * Returns 0 on success, error code (< 0) otherwise.
586 static int ide_port_wait_ready(ide_hwif_t *hwif)
588 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
592 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
594 /* Let HW settle down a bit from whatever init state we
598 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
599 * I know of at least one disk who takes 31 seconds, I use 35
602 rc = ide_wait_not_busy(hwif, 35000);
606 /* Now make sure both master & slave are ready */
607 ide_port_for_each_dev(i, drive, hwif) {
608 /* Ignore disks that we will not probe for later. */
609 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0 ||
610 (drive->dev_flags & IDE_DFLAG_PRESENT)) {
611 tp_ops->dev_select(drive);
612 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
614 rc = ide_wait_not_busy(hwif, 35000);
618 printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
622 /* Exit function with master reselected (let's be sane) */
624 tp_ops->dev_select(hwif->devices[0]);
630 * ide_undecoded_slave - look for bad CF adapters
631 * @dev1: slave device
633 * Analyse the drives on the interface and attempt to decide if we
634 * have the same drive viewed twice. This occurs with crap CF adapters
635 * and PCMCIA sometimes.
638 void ide_undecoded_slave(ide_drive_t *dev1)
640 ide_drive_t *dev0 = dev1->hwif->devices[0];
642 if ((dev1->dn & 1) == 0 || (dev0->dev_flags & IDE_DFLAG_PRESENT) == 0)
645 /* If the models don't match they are not the same product */
646 if (strcmp((char *)&dev0->id[ATA_ID_PROD],
647 (char *)&dev1->id[ATA_ID_PROD]))
650 /* Serial numbers do not match */
651 if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
652 (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
655 /* No serial number, thankfully very rare for CF */
656 if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
659 /* Appears to be an IDE flash adapter with decode bugs */
660 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
662 dev1->dev_flags &= ~IDE_DFLAG_PRESENT;
665 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
667 static int ide_probe_port(ide_hwif_t *hwif)
673 BUG_ON(hwif->present);
675 if ((hwif->devices[0]->dev_flags & IDE_DFLAG_NOPROBE) &&
676 (hwif->devices[1]->dev_flags & IDE_DFLAG_NOPROBE))
680 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
681 * we'll install our IRQ driver much later...
685 disable_irq(hwif->irq);
687 rc = ide_port_wait_ready(hwif);
689 printk(KERN_INFO "%s: no devices on the port\n", hwif->name);
691 } else if (rc == -EBUSY)
692 printk(KERN_ERR "%s: not ready before the probe\n", hwif->name);
697 * Second drive should only exist if first drive was found,
698 * but a lot of cdrom drives are configured as single slaves.
700 ide_port_for_each_dev(i, drive, hwif) {
701 (void) probe_for_drive(drive);
702 if (drive->dev_flags & IDE_DFLAG_PRESENT)
707 * Use cached IRQ number. It might be (and is...) changed by probe
716 static void ide_port_tune_devices(ide_hwif_t *hwif)
718 const struct ide_port_ops *port_ops = hwif->port_ops;
722 ide_port_for_each_present_dev(i, drive, hwif) {
723 ide_check_nien_quirk_list(drive);
725 if (port_ops && port_ops->quirkproc)
726 port_ops->quirkproc(drive);
729 ide_port_for_each_present_dev(i, drive, hwif) {
730 ide_set_max_pio(drive);
732 drive->dev_flags |= IDE_DFLAG_NICE1;
742 static int ide_init_queue(ide_drive_t *drive)
744 struct request_queue *q;
745 ide_hwif_t *hwif = drive->hwif;
746 int max_sectors = 256;
747 int max_sg_entries = PRD_ENTRIES;
750 * Our default set up assumes the normal IDE case,
751 * that is 64K segmenting, standard PRD setup
752 * and LBA28. Some drivers then impose their own
753 * limits and LBA48 we could raise it but as yet
757 q = blk_init_queue_node(do_ide_request, NULL, hwif_to_node(hwif));
761 q->queuedata = drive;
762 blk_queue_segment_boundary(q, 0xffff);
764 if (hwif->rqsize < max_sectors)
765 max_sectors = hwif->rqsize;
766 blk_queue_max_sectors(q, max_sectors);
769 /* When we have an IOMMU, we may have a problem where pci_map_sg()
770 * creates segments that don't completely match our boundary
771 * requirements and thus need to be broken up again. Because it
772 * doesn't align properly either, we may actually have to break up
773 * to more segments than what was we got in the first place, a max
774 * worst case is twice as many.
775 * This will be fixed once we teach pci_map_sg() about our boundary
776 * requirements, hopefully soon. *FIXME*
778 if (!PCI_DMA_BUS_IS_PHYS)
779 max_sg_entries >>= 1;
780 #endif /* CONFIG_PCI */
782 blk_queue_max_hw_segments(q, max_sg_entries);
783 blk_queue_max_phys_segments(q, max_sg_entries);
785 /* assign drive queue */
788 /* needs drive->queue to be set */
789 ide_toggle_bounce(drive, 1);
794 static DEFINE_MUTEX(ide_cfg_mtx);
797 * For any present drive:
798 * - allocate the block device queue
800 static int ide_port_setup_devices(ide_hwif_t *hwif)
805 mutex_lock(&ide_cfg_mtx);
806 ide_port_for_each_present_dev(i, drive, hwif) {
807 if (ide_init_queue(drive)) {
808 printk(KERN_ERR "ide: failed to init %s\n",
810 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
816 mutex_unlock(&ide_cfg_mtx);
821 static void ide_host_enable_irqs(struct ide_host *host)
826 ide_host_for_each_port(i, hwif, host) {
830 /* clear any pending IRQs */
831 hwif->tp_ops->read_status(hwif);
834 if (hwif->io_ports.ctl_addr)
835 hwif->tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
840 * This routine sets up the IRQ for an IDE interface.
842 static int init_irq (ide_hwif_t *hwif)
844 struct ide_io_ports *io_ports = &hwif->io_ports;
845 struct ide_host *host = hwif->host;
846 irq_handler_t irq_handler = host->irq_handler;
847 int sa = host->irq_flags;
849 if (irq_handler == NULL)
850 irq_handler = ide_intr;
852 if (request_irq(hwif->irq, irq_handler, sa, hwif->name, hwif))
855 #if !defined(__mc68000__)
856 printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
857 io_ports->data_addr, io_ports->status_addr,
858 io_ports->ctl_addr, hwif->irq);
860 printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
861 io_ports->data_addr, hwif->irq);
862 #endif /* __mc68000__ */
863 if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE)
864 printk(KERN_CONT " (serialized)");
865 printk(KERN_CONT "\n");
872 static int ata_lock(dev_t dev, void *data)
874 /* FIXME: we want to pin hwif down */
878 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
880 ide_hwif_t *hwif = data;
881 int unit = *part >> PARTN_BITS;
882 ide_drive_t *drive = hwif->devices[unit];
884 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
887 if (drive->media == ide_disk)
888 request_module("ide-disk");
889 if (drive->media == ide_cdrom || drive->media == ide_optical)
890 request_module("ide-cd");
891 if (drive->media == ide_tape)
892 request_module("ide-tape");
893 if (drive->media == ide_floppy)
894 request_module("ide-floppy");
899 static struct kobject *exact_match(dev_t dev, int *part, void *data)
901 struct gendisk *p = data;
902 *part &= (1 << PARTN_BITS) - 1;
903 return &disk_to_dev(p)->kobj;
906 static int exact_lock(dev_t dev, void *data)
908 struct gendisk *p = data;
915 void ide_register_region(struct gendisk *disk)
917 blk_register_region(MKDEV(disk->major, disk->first_minor),
918 disk->minors, NULL, exact_match, exact_lock, disk);
921 EXPORT_SYMBOL_GPL(ide_register_region);
923 void ide_unregister_region(struct gendisk *disk)
925 blk_unregister_region(MKDEV(disk->major, disk->first_minor),
929 EXPORT_SYMBOL_GPL(ide_unregister_region);
931 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
933 ide_hwif_t *hwif = drive->hwif;
934 unsigned int unit = drive->dn & 1;
936 disk->major = hwif->major;
937 disk->first_minor = unit << PARTN_BITS;
938 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
939 disk->queue = drive->queue;
942 EXPORT_SYMBOL_GPL(ide_init_disk);
944 static void drive_release_dev (struct device *dev)
946 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
948 ide_proc_unregister_device(drive);
950 blk_cleanup_queue(drive->queue);
953 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
955 complete(&drive->gendev_rel_comp);
958 static int hwif_init(ide_hwif_t *hwif)
961 printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
965 if (register_blkdev(hwif->major, hwif->name))
968 if (!hwif->sg_max_nents)
969 hwif->sg_max_nents = PRD_ENTRIES;
971 hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
973 if (!hwif->sg_table) {
974 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
978 sg_init_table(hwif->sg_table, hwif->sg_max_nents);
980 if (init_irq(hwif)) {
981 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
982 hwif->name, hwif->irq);
986 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
987 THIS_MODULE, ata_probe, ata_lock, hwif);
991 unregister_blkdev(hwif->major, hwif->name);
995 static void hwif_register_devices(ide_hwif_t *hwif)
1000 ide_port_for_each_present_dev(i, drive, hwif) {
1001 struct device *dev = &drive->gendev;
1004 dev_set_name(dev, "%u.%u", hwif->index, i);
1005 dev_set_drvdata(dev, drive);
1006 dev->parent = &hwif->gendev;
1007 dev->bus = &ide_bus_type;
1008 dev->release = drive_release_dev;
1010 ret = device_register(dev);
1012 printk(KERN_WARNING "IDE: %s: device_register error: "
1013 "%d\n", __func__, ret);
1017 static void ide_port_init_devices(ide_hwif_t *hwif)
1019 const struct ide_port_ops *port_ops = hwif->port_ops;
1023 ide_port_for_each_dev(i, drive, hwif) {
1024 drive->dn = i + hwif->channel * 2;
1026 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1027 drive->io_32bit = 1;
1028 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
1029 drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
1030 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1031 drive->dev_flags |= IDE_DFLAG_UNMASK;
1032 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1033 drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
1035 if (port_ops && port_ops->init_dev)
1036 port_ops->init_dev(drive);
1039 ide_port_for_each_dev(i, drive, hwif) {
1041 * default to PIO Mode 0 before we figure out
1042 * the most suited mode for the attached device
1044 if (port_ops && port_ops->set_pio_mode)
1045 port_ops->set_pio_mode(drive, 0);
1049 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1050 const struct ide_port_info *d)
1052 hwif->channel = port;
1054 hwif->chipset = d->chipset ? d->chipset : ide_pci;
1059 /* ->host_flags may be set by ->init_iops (or even earlier...) */
1060 hwif->host_flags |= d->host_flags;
1061 hwif->pio_mask = d->pio_mask;
1064 hwif->tp_ops = d->tp_ops;
1066 /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1067 if ((hwif->host_flags & IDE_HFLAG_DTC2278) == 0 || hwif->channel == 0)
1068 hwif->port_ops = d->port_ops;
1070 hwif->swdma_mask = d->swdma_mask;
1071 hwif->mwdma_mask = d->mwdma_mask;
1072 hwif->ultra_mask = d->udma_mask;
1074 if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1077 hwif->dma_ops = d->dma_ops;
1080 rc = d->init_dma(hwif, d);
1082 rc = ide_hwif_setup_dma(hwif, d);
1085 printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1087 hwif->dma_ops = NULL;
1089 hwif->swdma_mask = 0;
1090 hwif->mwdma_mask = 0;
1091 hwif->ultra_mask = 0;
1095 if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1096 ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base))
1097 hwif->host->host_flags |= IDE_HFLAG_SERIALIZE;
1100 hwif->rqsize = d->max_sectors;
1102 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1103 (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1106 hwif->rqsize = 65536;
1109 /* call chipset specific routine for each enabled port */
1114 static void ide_port_cable_detect(ide_hwif_t *hwif)
1116 const struct ide_port_ops *port_ops = hwif->port_ops;
1118 if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1119 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1120 hwif->cbl = port_ops->cable_detect(hwif);
1124 static const u8 ide_hwif_to_major[] =
1125 { IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR, IDE4_MAJOR,
1126 IDE5_MAJOR, IDE6_MAJOR, IDE7_MAJOR, IDE8_MAJOR, IDE9_MAJOR };
1128 static void ide_port_init_devices_data(ide_hwif_t *hwif)
1133 ide_port_for_each_dev(i, drive, hwif) {
1134 u8 j = (hwif->index * MAX_DRIVES) + i;
1135 u16 *saved_id = drive->id;
1137 memset(drive, 0, sizeof(*drive));
1138 memset(saved_id, 0, SECTOR_SIZE);
1139 drive->id = saved_id;
1141 drive->media = ide_disk;
1142 drive->select = (i << 4) | ATA_DEVICE_OBS;
1144 drive->ready_stat = ATA_DRDY;
1145 drive->bad_wstat = BAD_W_STAT;
1146 drive->special_flags = IDE_SFLAG_RECALIBRATE |
1147 IDE_SFLAG_SET_GEOMETRY;
1148 drive->name[0] = 'h';
1149 drive->name[1] = 'd';
1150 drive->name[2] = 'a' + j;
1151 drive->max_failures = IDE_DEFAULT_MAX_FAILURES;
1153 INIT_LIST_HEAD(&drive->list);
1154 init_completion(&drive->gendev_rel_comp);
1158 static void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
1160 /* fill in any non-zero initial values */
1161 hwif->index = index;
1162 hwif->major = ide_hwif_to_major[index];
1164 hwif->name[0] = 'i';
1165 hwif->name[1] = 'd';
1166 hwif->name[2] = 'e';
1167 hwif->name[3] = '0' + index;
1169 spin_lock_init(&hwif->lock);
1171 init_timer(&hwif->timer);
1172 hwif->timer.function = &ide_timer_expiry;
1173 hwif->timer.data = (unsigned long)hwif;
1175 init_completion(&hwif->gendev_rel_comp);
1177 hwif->tp_ops = &default_tp_ops;
1179 ide_port_init_devices_data(hwif);
1182 static void ide_init_port_hw(ide_hwif_t *hwif, struct ide_hw *hw)
1184 memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
1185 hwif->irq = hw->irq;
1186 hwif->dev = hw->dev;
1187 hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
1188 hwif->config_data = hw->config;
1191 static unsigned int ide_indexes;
1194 * ide_find_port_slot - find free port slot
1197 * Return the new port slot index or -ENOENT if we are out of free slots.
1200 static int ide_find_port_slot(const struct ide_port_info *d)
1203 u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1204 u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1207 * Claim an unassigned slot.
1209 * Give preference to claiming other slots before claiming ide0/ide1,
1210 * just in case there's another interface yet-to-be-scanned
1211 * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1213 * Unless there is a bootable card that does not use the standard
1214 * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1216 mutex_lock(&ide_cfg_mtx);
1218 if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1219 idx = ffz(ide_indexes | i);
1221 if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1222 idx = ffz(ide_indexes | 3);
1223 else if ((ide_indexes & 3) != 3)
1224 idx = ffz(ide_indexes);
1227 ide_indexes |= (1 << idx);
1228 mutex_unlock(&ide_cfg_mtx);
1233 static void ide_free_port_slot(int idx)
1235 mutex_lock(&ide_cfg_mtx);
1236 ide_indexes &= ~(1 << idx);
1237 mutex_unlock(&ide_cfg_mtx);
1240 static void ide_port_free_devices(ide_hwif_t *hwif)
1245 ide_port_for_each_dev(i, drive, hwif) {
1251 static int ide_port_alloc_devices(ide_hwif_t *hwif, int node)
1255 for (i = 0; i < MAX_DRIVES; i++) {
1258 drive = kzalloc_node(sizeof(*drive), GFP_KERNEL, node);
1263 * In order to keep things simple we have an id
1264 * block for all drives at all times. If the device
1265 * is pre ATA or refuses ATA/ATAPI identify we
1266 * will add faked data to this.
1268 * Also note that 0 everywhere means "can't do X"
1270 drive->id = kzalloc_node(SECTOR_SIZE, GFP_KERNEL, node);
1271 if (drive->id == NULL)
1274 hwif->devices[i] = drive;
1279 ide_port_free_devices(hwif);
1283 struct ide_host *ide_host_alloc(const struct ide_port_info *d,
1284 struct ide_hw **hws, unsigned int n_ports)
1286 struct ide_host *host;
1287 struct device *dev = hws[0] ? hws[0]->dev : NULL;
1288 int node = dev ? dev_to_node(dev) : -1;
1291 host = kzalloc_node(sizeof(*host), GFP_KERNEL, node);
1295 for (i = 0; i < n_ports; i++) {
1302 hwif = kzalloc_node(sizeof(*hwif), GFP_KERNEL, node);
1306 if (ide_port_alloc_devices(hwif, node) < 0) {
1311 idx = ide_find_port_slot(d);
1313 printk(KERN_ERR "%s: no free slot for interface\n",
1314 d ? d->name : "ide");
1315 ide_port_free_devices(hwif);
1320 ide_init_port_data(hwif, idx);
1324 host->ports[i] = hwif;
1328 if (host->n_ports == 0) {
1336 host->init_chipset = d->init_chipset;
1337 host->get_lock = d->get_lock;
1338 host->release_lock = d->release_lock;
1339 host->host_flags = d->host_flags;
1340 host->irq_flags = d->irq_flags;
1345 EXPORT_SYMBOL_GPL(ide_host_alloc);
1347 static void ide_port_free(ide_hwif_t *hwif)
1349 ide_port_free_devices(hwif);
1350 ide_free_port_slot(hwif->index);
1354 static void ide_disable_port(ide_hwif_t *hwif)
1356 struct ide_host *host = hwif->host;
1359 printk(KERN_INFO "%s: disabling port\n", hwif->name);
1361 for (i = 0; i < MAX_HOST_PORTS; i++) {
1362 if (host->ports[i] == hwif) {
1363 host->ports[i] = NULL;
1368 ide_port_free(hwif);
1371 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1372 struct ide_hw **hws)
1374 ide_hwif_t *hwif, *mate = NULL;
1377 ide_host_for_each_port(i, hwif, host) {
1383 ide_init_port_hw(hwif, hws[i]);
1384 ide_port_apply_params(hwif);
1386 if ((i & 1) && mate) {
1391 mate = (i & 1) ? NULL : hwif;
1393 ide_init_port(hwif, i & 1, d);
1394 ide_port_cable_detect(hwif);
1396 hwif->port_flags |= IDE_PFLAG_PROBING;
1398 ide_port_init_devices(hwif);
1401 ide_host_for_each_port(i, hwif, host) {
1405 if (ide_probe_port(hwif) == 0)
1408 hwif->port_flags &= ~IDE_PFLAG_PROBING;
1410 if ((hwif->host_flags & IDE_HFLAG_4DRIVES) == 0 ||
1411 hwif->mate == NULL || hwif->mate->present == 0) {
1412 if (ide_register_port(hwif)) {
1413 ide_disable_port(hwif);
1419 ide_port_tune_devices(hwif);
1422 ide_host_enable_irqs(host);
1424 ide_host_for_each_port(i, hwif, host) {
1428 if (hwif_init(hwif) == 0) {
1429 printk(KERN_INFO "%s: failed to initialize IDE "
1430 "interface\n", hwif->name);
1431 device_unregister(&hwif->gendev);
1432 ide_disable_port(hwif);
1437 if (ide_port_setup_devices(hwif) == 0) {
1444 ide_acpi_init_port(hwif);
1447 ide_acpi_port_init_devices(hwif);
1450 ide_host_for_each_port(i, hwif, host) {
1455 hwif_register_devices(hwif);
1458 ide_host_for_each_port(i, hwif, host) {
1462 ide_sysfs_register_port(hwif);
1463 ide_proc_register_port(hwif);
1466 ide_proc_port_register_devices(hwif);
1471 EXPORT_SYMBOL_GPL(ide_host_register);
1473 int ide_host_add(const struct ide_port_info *d, struct ide_hw **hws,
1474 unsigned int n_ports, struct ide_host **hostp)
1476 struct ide_host *host;
1479 host = ide_host_alloc(d, hws, n_ports);
1483 rc = ide_host_register(host, d, hws);
1485 ide_host_free(host);
1494 EXPORT_SYMBOL_GPL(ide_host_add);
1496 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
1501 ide_port_for_each_present_dev(i, drive, hwif) {
1502 device_unregister(&drive->gendev);
1503 wait_for_completion(&drive->gendev_rel_comp);
1507 void ide_port_unregister_devices(ide_hwif_t *hwif)
1509 mutex_lock(&ide_cfg_mtx);
1510 __ide_port_unregister_devices(hwif);
1512 ide_port_init_devices_data(hwif);
1513 mutex_unlock(&ide_cfg_mtx);
1515 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
1518 * ide_unregister - free an IDE interface
1519 * @hwif: IDE interface
1521 * Perform the final unregister of an IDE interface.
1524 * The caller must not hold the IDE locks.
1526 * It is up to the caller to be sure there is no pending I/O here,
1527 * and that the interface will not be reopened (present/vanishing
1528 * locking isn't yet done BTW).
1531 static void ide_unregister(ide_hwif_t *hwif)
1533 BUG_ON(in_interrupt());
1534 BUG_ON(irqs_disabled());
1536 mutex_lock(&ide_cfg_mtx);
1538 if (hwif->present) {
1539 __ide_port_unregister_devices(hwif);
1543 ide_proc_unregister_port(hwif);
1545 free_irq(hwif->irq, hwif);
1547 device_unregister(hwif->portdev);
1548 device_unregister(&hwif->gendev);
1549 wait_for_completion(&hwif->gendev_rel_comp);
1552 * Remove us from the kernel's knowledge
1554 blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
1555 kfree(hwif->sg_table);
1556 unregister_blkdev(hwif->major, hwif->name);
1558 ide_release_dma_engine(hwif);
1560 mutex_unlock(&ide_cfg_mtx);
1563 void ide_host_free(struct ide_host *host)
1568 ide_host_for_each_port(i, hwif, host) {
1570 ide_port_free(hwif);
1575 EXPORT_SYMBOL_GPL(ide_host_free);
1577 void ide_host_remove(struct ide_host *host)
1582 ide_host_for_each_port(i, hwif, host) {
1584 ide_unregister(hwif);
1587 ide_host_free(host);
1589 EXPORT_SYMBOL_GPL(ide_host_remove);
1591 void ide_port_scan(ide_hwif_t *hwif)
1595 ide_port_apply_params(hwif);
1596 ide_port_cable_detect(hwif);
1598 hwif->port_flags |= IDE_PFLAG_PROBING;
1600 ide_port_init_devices(hwif);
1602 rc = ide_probe_port(hwif);
1604 hwif->port_flags &= ~IDE_PFLAG_PROBING;
1611 ide_port_tune_devices(hwif);
1612 ide_port_setup_devices(hwif);
1613 ide_acpi_port_init_devices(hwif);
1614 hwif_register_devices(hwif);
1615 ide_proc_port_register_devices(hwif);
1617 EXPORT_SYMBOL_GPL(ide_port_scan);