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2 * linux/drivers/ide/ide-probe.c Version 1.11 Mar 05, 2003
4 * Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
8 * Mostly written by Mark Lord <mlord@pobox.com>
9 * and Gadi Oxman <gadio@netvision.net.il>
10 * and Andre Hedrick <andre@linux-ide.org>
12 * See linux/MAINTAINERS for address of current maintainer.
14 * This is the IDE probe module, as evolved from hd.c and ide.c.
16 * Version 1.00 move drive probing code from ide.c to ide-probe.c
17 * Version 1.01 fix compilation problem for m68k
18 * Version 1.02 increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
20 * Version 1.03 fix for (hwif->chipset == ide_4drives)
21 * Version 1.04 fixed buggy treatments of known flash memory cards
23 * Version 1.05 fix for (hwif->chipset == ide_pdc4030)
25 * allowed for secondary flash card to be detectable
26 * with new flag : drive->ata_flash : 1;
27 * Version 1.06 stream line request queue and prep for cascade project.
28 * Version 1.07 max_sect <= 255; slower disks would get behind and
29 * then fall over when they get to 256. Paul G.
30 * Version 1.10 Update set for new IDE. drive->id is now always
31 * valid after probe time even with noprobe
34 #undef REALLY_SLOW_IO /* most systems can safely undef this */
36 #include <linux/module.h>
37 #include <linux/types.h>
38 #include <linux/string.h>
39 #include <linux/kernel.h>
40 #include <linux/timer.h>
42 #include <linux/interrupt.h>
43 #include <linux/major.h>
44 #include <linux/errno.h>
45 #include <linux/genhd.h>
46 #include <linux/slab.h>
47 #include <linux/delay.h>
48 #include <linux/ide.h>
49 #include <linux/spinlock.h>
50 #include <linux/kmod.h>
51 #include <linux/pci.h>
53 #include <asm/byteorder.h>
55 #include <asm/uaccess.h>
59 * generic_id - add a generic drive id
60 * @drive: drive to make an ID block for
62 * Add a fake id field to the drive we are passed. This allows
63 * use to skip a ton of NULL checks (which people always miss)
64 * and make drive properties unconditional outside of this file
67 static void generic_id(ide_drive_t
*drive
)
69 drive
->id
->cyls
= drive
->cyl
;
70 drive
->id
->heads
= drive
->head
;
71 drive
->id
->sectors
= drive
->sect
;
72 drive
->id
->cur_cyls
= drive
->cyl
;
73 drive
->id
->cur_heads
= drive
->head
;
74 drive
->id
->cur_sectors
= drive
->sect
;
77 static void ide_disk_init_chs(ide_drive_t
*drive
)
79 struct hd_driveid
*id
= drive
->id
;
81 /* Extract geometry if we did not already have one for the drive */
82 if (!drive
->cyl
|| !drive
->head
|| !drive
->sect
) {
83 drive
->cyl
= drive
->bios_cyl
= id
->cyls
;
84 drive
->head
= drive
->bios_head
= id
->heads
;
85 drive
->sect
= drive
->bios_sect
= id
->sectors
;
88 /* Handle logical geometry translation by the drive */
89 if ((id
->field_valid
& 1) && id
->cur_cyls
&&
90 id
->cur_heads
&& (id
->cur_heads
<= 16) && id
->cur_sectors
) {
91 drive
->cyl
= id
->cur_cyls
;
92 drive
->head
= id
->cur_heads
;
93 drive
->sect
= id
->cur_sectors
;
96 /* Use physical geometry if what we have still makes no sense */
97 if (drive
->head
> 16 && id
->heads
&& id
->heads
<= 16) {
98 drive
->cyl
= id
->cyls
;
99 drive
->head
= id
->heads
;
100 drive
->sect
= id
->sectors
;
104 static void ide_disk_init_mult_count(ide_drive_t
*drive
)
106 struct hd_driveid
*id
= drive
->id
;
108 drive
->mult_count
= 0;
109 if (id
->max_multsect
) {
110 #ifdef CONFIG_IDEDISK_MULTI_MODE
111 id
->multsect
= ((id
->max_multsect
/2) > 1) ? id
->max_multsect
: 0;
112 id
->multsect_valid
= id
->multsect
? 1 : 0;
113 drive
->mult_req
= id
->multsect_valid
? id
->max_multsect
: INITIAL_MULT_COUNT
;
114 drive
->special
.b
.set_multmode
= drive
->mult_req
? 1 : 0;
115 #else /* original, pre IDE-NFG, per request of AC */
116 drive
->mult_req
= INITIAL_MULT_COUNT
;
117 if (drive
->mult_req
> id
->max_multsect
)
118 drive
->mult_req
= id
->max_multsect
;
119 if (drive
->mult_req
|| ((id
->multsect_valid
& 1) && id
->multsect
))
120 drive
->special
.b
.set_multmode
= 1;
126 * do_identify - identify a drive
127 * @drive: drive to identify
130 * Called when we have issued a drive identify command to
131 * read and parse the results. This function is run with
132 * interrupts disabled.
135 static inline void do_identify (ide_drive_t
*drive
, u8 cmd
)
137 ide_hwif_t
*hwif
= HWIF(drive
);
139 struct hd_driveid
*id
;
142 /* read 512 bytes of id info */
143 hwif
->ata_input_data(drive
, id
, SECTOR_WORDS
);
149 #if defined (CONFIG_SCSI_EATA_DMA) || defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
151 * EATA SCSI controllers do a hardware ATA emulation:
152 * Ignore them if there is a driver for them available.
154 if ((id
->model
[0] == 'P' && id
->model
[1] == 'M') ||
155 (id
->model
[0] == 'S' && id
->model
[1] == 'K')) {
156 printk("%s: EATA SCSI HBA %.10s\n", drive
->name
, id
->model
);
159 #endif /* CONFIG_SCSI_EATA_DMA || CONFIG_SCSI_EATA_PIO */
162 * WIN_IDENTIFY returns little-endian info,
163 * WIN_PIDENTIFY *usually* returns little-endian info.
165 if (cmd
== WIN_PIDENTIFY
) {
166 if ((id
->model
[0] == 'N' && id
->model
[1] == 'E') /* NEC */
167 || (id
->model
[0] == 'F' && id
->model
[1] == 'X') /* Mitsumi */
168 || (id
->model
[0] == 'P' && id
->model
[1] == 'i'))/* Pioneer */
169 /* Vertos drives may still be weird */
172 ide_fixstring(id
->model
, sizeof(id
->model
), bswap
);
173 ide_fixstring(id
->fw_rev
, sizeof(id
->fw_rev
), bswap
);
174 ide_fixstring(id
->serial_no
, sizeof(id
->serial_no
), bswap
);
176 if (strstr(id
->model
, "E X A B Y T E N E S T"))
179 /* we depend on this a lot! */
180 id
->model
[sizeof(id
->model
)-1] = '\0';
181 printk("%s: %s, ", drive
->name
, id
->model
);
186 * Check for an ATAPI device
188 if (cmd
== WIN_PIDENTIFY
) {
189 u8 type
= (id
->config
>> 8) & 0x1f;
193 if (!strstr(id
->model
, "CD-ROM")) {
194 if (!strstr(id
->model
, "oppy") &&
195 !strstr(id
->model
, "poyp") &&
196 !strstr(id
->model
, "ZIP"))
197 printk("cdrom or floppy?, assuming ");
198 if (drive
->media
!= ide_cdrom
) {
200 drive
->removable
= 1;
204 /* Early cdrom models used zero */
207 drive
->removable
= 1;
209 /* kludge for Apple PowerBook internal zip */
210 if (!strstr(id
->model
, "CD-ROM") &&
211 strstr(id
->model
, "ZIP")) {
217 printk ("CD/DVD-ROM");
224 drive
->removable
= 1;
227 printk("UNKNOWN (type %d)", type
);
232 /* an ATAPI device ignores DRDY */
233 drive
->ready_stat
= 0;
238 * Not an ATAPI device: looks like a "regular" hard disk
242 * 0x848a = CompactFlash device
243 * These are *not* removable in Linux definition of the term
246 if ((id
->config
!= 0x848a) && (id
->config
& (1<<7)))
247 drive
->removable
= 1;
249 drive
->media
= ide_disk
;
250 printk("%s DISK drive\n", (id
->config
== 0x848a) ? "CFA" : "ATA" );
261 * actual_try_to_identify - send ata/atapi identify
262 * @drive: drive to identify
263 * @cmd: command to use
265 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
266 * and waits for a response. It also monitors irqs while this is
267 * happening, in hope of automatically determining which one is
268 * being used by the interface.
270 * Returns: 0 device was identified
271 * 1 device timed-out (no response to identify request)
272 * 2 device aborted the command (refused to identify itself)
275 static int actual_try_to_identify (ide_drive_t
*drive
, u8 cmd
)
277 ide_hwif_t
*hwif
= HWIF(drive
);
279 unsigned long hd_status
;
280 unsigned long timeout
;
283 /* take a deep breath */
286 if (IDE_CONTROL_REG
) {
287 a
= hwif
->INB(IDE_ALTSTATUS_REG
);
288 s
= hwif
->INB(IDE_STATUS_REG
);
289 if ((a
^ s
) & ~INDEX_STAT
) {
290 printk(KERN_INFO
"%s: probing with STATUS(0x%02x) instead of "
291 "ALTSTATUS(0x%02x)\n", drive
->name
, s
, a
);
292 /* ancient Seagate drives, broken interfaces */
293 hd_status
= IDE_STATUS_REG
;
295 /* use non-intrusive polling */
296 hd_status
= IDE_ALTSTATUS_REG
;
299 hd_status
= IDE_STATUS_REG
;
301 /* set features register for atapi
302 * identify command to be sure of reply
304 if ((cmd
== WIN_PIDENTIFY
))
305 /* disable dma & overlap */
306 hwif
->OUTB(0, IDE_FEATURE_REG
);
308 /* ask drive for ID */
309 hwif
->OUTB(cmd
, IDE_COMMAND_REG
);
311 timeout
= ((cmd
== WIN_IDENTIFY
) ? WAIT_WORSTCASE
: WAIT_PIDENTIFY
) / 2;
314 if (time_after(jiffies
, timeout
)) {
315 /* drive timed-out */
318 /* give drive a breather */
320 } while ((hwif
->INB(hd_status
)) & BUSY_STAT
);
322 /* wait for IRQ and DRQ_STAT */
324 if (OK_STAT((hwif
->INB(IDE_STATUS_REG
)), 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) hwif
->INB(IDE_STATUS_REG
);
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
);
358 unsigned long cookie
= 0;
361 * Disable device irq unless we need to
362 * probe for it. Otherwise we'll get spurious
363 * interrupts during the identify-phase that
364 * the irq handler isn't expecting.
366 if (IDE_CONTROL_REG
) {
367 u8 ctl
= drive
->ctl
| 2;
370 cookie
= probe_irq_on();
371 /* enable device irq */
374 hwif
->OUTB(ctl
, IDE_CONTROL_REG
);
377 retval
= actual_try_to_identify(drive
, cmd
);
381 /* mask device irq */
382 hwif
->OUTB(drive
->ctl
|2, IDE_CONTROL_REG
);
383 /* clear drive IRQ */
384 (void) hwif
->INB(IDE_STATUS_REG
);
386 irq
= probe_irq_off(cookie
);
391 /* Mmmm.. multiple IRQs..
392 * don't know which was ours
394 printk("%s: IRQ probe failed (0x%lx)\n",
395 drive
->name
, cookie
);
404 * do_probe - probe an IDE device
405 * @drive: drive to probe
406 * @cmd: command to use
408 * do_probe() has the difficult job of finding a drive if it exists,
409 * without getting hung up if it doesn't exist, without trampling on
410 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
412 * If a drive is "known" to exist (from CMOS or kernel parameters),
413 * but does not respond right away, the probe will "hang in there"
414 * for the maximum wait time (about 30 seconds), otherwise it will
415 * exit much more quickly.
417 * Returns: 0 device was identified
418 * 1 device timed-out (no response to identify request)
419 * 2 device aborted the command (refused to identify itself)
420 * 3 bad status from device (possible for ATAPI drives)
421 * 4 probe was not attempted because failure was obvious
424 static int do_probe (ide_drive_t
*drive
, u8 cmd
)
427 ide_hwif_t
*hwif
= HWIF(drive
);
429 if (drive
->present
) {
430 /* avoid waiting for inappropriate probes */
431 if ((drive
->media
!= ide_disk
) && (cmd
== WIN_IDENTIFY
))
435 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
436 drive
->name
, drive
->present
, drive
->media
,
437 (cmd
== WIN_IDENTIFY
) ? "ATA" : "ATAPI");
440 /* needed for some systems
441 * (e.g. crw9624 as drive0 with disk as slave)
446 if (hwif
->INB(IDE_SELECT_REG
) != drive
->select
.all
&& !drive
->present
) {
447 if (drive
->select
.b
.unit
!= 0) {
448 /* exit with drive0 selected */
449 SELECT_DRIVE(&hwif
->drives
[0]);
450 /* allow BUSY_STAT to assert & clear */
453 /* no i/f present: mmm.. this should be a 4 -ml */
457 if (OK_STAT((hwif
->INB(IDE_STATUS_REG
)), READY_STAT
, BUSY_STAT
) ||
458 drive
->present
|| cmd
== WIN_PIDENTIFY
) {
459 /* send cmd and wait */
460 if ((rc
= try_to_identify(drive
, cmd
))) {
461 /* failed: try again */
462 rc
= try_to_identify(drive
,cmd
);
464 if (hwif
->INB(IDE_STATUS_REG
) == (BUSY_STAT
|READY_STAT
))
467 if ((rc
== 1 && cmd
== WIN_PIDENTIFY
) &&
468 ((drive
->autotune
== IDE_TUNE_DEFAULT
) ||
469 (drive
->autotune
== IDE_TUNE_AUTO
))) {
470 unsigned long timeout
;
471 printk("%s: no response (status = 0x%02x), "
472 "resetting drive\n", drive
->name
,
473 hwif
->INB(IDE_STATUS_REG
));
475 hwif
->OUTB(drive
->select
.all
, IDE_SELECT_REG
);
477 hwif
->OUTB(WIN_SRST
, IDE_COMMAND_REG
);
479 while (((hwif
->INB(IDE_STATUS_REG
)) & BUSY_STAT
) &&
480 time_before(jiffies
, timeout
+ WAIT_WORSTCASE
))
482 rc
= try_to_identify(drive
, cmd
);
485 printk("%s: no response (status = 0x%02x)\n",
486 drive
->name
, hwif
->INB(IDE_STATUS_REG
));
487 /* ensure drive irq is clear */
488 (void) hwif
->INB(IDE_STATUS_REG
);
490 /* not present or maybe ATAPI */
493 if (drive
->select
.b
.unit
!= 0) {
494 /* exit with drive0 selected */
495 SELECT_DRIVE(&hwif
->drives
[0]);
497 /* ensure drive irq is clear */
498 (void) hwif
->INB(IDE_STATUS_REG
);
506 static void enable_nest (ide_drive_t
*drive
)
508 ide_hwif_t
*hwif
= HWIF(drive
);
509 unsigned long timeout
;
511 printk("%s: enabling %s -- ", hwif
->name
, drive
->id
->model
);
514 hwif
->OUTB(EXABYTE_ENABLE_NEST
, IDE_COMMAND_REG
);
515 timeout
= jiffies
+ WAIT_WORSTCASE
;
517 if (time_after(jiffies
, timeout
)) {
518 printk("failed (timeout)\n");
522 } while ((hwif
->INB(IDE_STATUS_REG
)) & BUSY_STAT
);
526 if (!OK_STAT((hwif
->INB(IDE_STATUS_REG
)), 0, BAD_STAT
)) {
527 printk("failed (status = 0x%02x)\n", hwif
->INB(IDE_STATUS_REG
));
532 /* if !(success||timed-out) */
533 if (do_probe(drive
, WIN_IDENTIFY
) >= 2) {
534 /* look for ATAPI device */
535 (void) do_probe(drive
, WIN_PIDENTIFY
);
540 * probe_for_drives - upper level drive probe
541 * @drive: drive to probe for
543 * probe_for_drive() tests for existence of a given drive using do_probe()
544 * and presents things to the user as needed.
546 * Returns: 0 no device was found
547 * 1 device was found (note: drive->present might
551 static inline u8
probe_for_drive (ide_drive_t
*drive
)
554 * In order to keep things simple we have an id
555 * block for all drives at all times. If the device
556 * is pre ATA or refuses ATA/ATAPI identify we
557 * will add faked data to this.
559 * Also note that 0 everywhere means "can't do X"
562 drive
->id
= kzalloc(SECTOR_WORDS
*4, GFP_KERNEL
);
564 if(drive
->id
== NULL
)
566 printk(KERN_ERR
"ide: out of memory for id data.\n");
569 strcpy(drive
->id
->model
, "UNKNOWN");
574 /* if !(success||timed-out) */
575 if (do_probe(drive
, WIN_IDENTIFY
) >= 2) {
576 /* look for ATAPI device */
577 (void) do_probe(drive
, WIN_PIDENTIFY
);
579 if (strstr(drive
->id
->model
, "E X A B Y T E N E S T"))
582 /* drive not found */
585 /* identification failed? */
586 if (!drive
->id_read
) {
587 if (drive
->media
== ide_disk
) {
588 printk(KERN_INFO
"%s: non-IDE drive, CHS=%d/%d/%d\n",
589 drive
->name
, drive
->cyl
,
590 drive
->head
, drive
->sect
);
591 } else if (drive
->media
== ide_cdrom
) {
592 printk(KERN_INFO
"%s: ATAPI cdrom (?)\n", drive
->name
);
595 printk(KERN_WARNING
"%s: Unknown device on bus refused identification. Ignoring.\n", drive
->name
);
599 /* drive was found */
603 /* The drive wasn't being helpful. Add generic info only */
604 if (drive
->id_read
== 0) {
609 if (drive
->media
== ide_disk
) {
610 ide_disk_init_chs(drive
);
611 ide_disk_init_mult_count(drive
);
614 return drive
->present
;
617 static void hwif_release_dev (struct device
*dev
)
619 ide_hwif_t
*hwif
= container_of(dev
, ide_hwif_t
, gendev
);
621 complete(&hwif
->gendev_rel_comp
);
624 static void hwif_register (ide_hwif_t
*hwif
)
626 /* register with global device tree */
627 strlcpy(hwif
->gendev
.bus_id
,hwif
->name
,BUS_ID_SIZE
);
628 hwif
->gendev
.driver_data
= hwif
;
629 if (hwif
->gendev
.parent
== NULL
) {
631 hwif
->gendev
.parent
= &hwif
->pci_dev
->dev
;
633 /* Would like to do = &device_legacy */
634 hwif
->gendev
.parent
= NULL
;
636 hwif
->gendev
.release
= hwif_release_dev
;
637 device_register(&hwif
->gendev
);
640 static int wait_hwif_ready(ide_hwif_t
*hwif
)
644 printk(KERN_DEBUG
"Probing IDE interface %s...\n", hwif
->name
);
646 /* Let HW settle down a bit from whatever init state we
650 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
651 * I know of at least one disk who takes 31 seconds, I use 35
654 rc
= ide_wait_not_busy(hwif
, 35000);
658 /* Now make sure both master & slave are ready */
659 SELECT_DRIVE(&hwif
->drives
[0]);
660 hwif
->OUTB(8, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
662 rc
= ide_wait_not_busy(hwif
, 35000);
665 SELECT_DRIVE(&hwif
->drives
[1]);
666 hwif
->OUTB(8, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
668 rc
= ide_wait_not_busy(hwif
, 35000);
670 /* Exit function with master reselected (let's be sane) */
671 SELECT_DRIVE(&hwif
->drives
[0]);
677 * ide_undecoded_slave - look for bad CF adapters
680 * Analyse the drives on the interface and attempt to decide if we
681 * have the same drive viewed twice. This occurs with crap CF adapters
682 * and PCMCIA sometimes.
685 void ide_undecoded_slave(ide_hwif_t
*hwif
)
687 ide_drive_t
*drive0
= &hwif
->drives
[0];
688 ide_drive_t
*drive1
= &hwif
->drives
[1];
690 if (drive0
->present
== 0 || drive1
->present
== 0)
693 /* If the models don't match they are not the same product */
694 if (strcmp(drive0
->id
->model
, drive1
->id
->model
))
697 /* Serial numbers do not match */
698 if (strncmp(drive0
->id
->serial_no
, drive1
->id
->serial_no
, 20))
701 /* No serial number, thankfully very rare for CF */
702 if (drive0
->id
->serial_no
[0] == 0)
705 /* Appears to be an IDE flash adapter with decode bugs */
706 printk(KERN_WARNING
"ide-probe: ignoring undecoded slave\n");
711 EXPORT_SYMBOL_GPL(ide_undecoded_slave
);
714 * This routine only knows how to look for drive units 0 and 1
715 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
717 static void probe_hwif(ide_hwif_t
*hwif
)
726 if ((hwif
->chipset
!= ide_4drives
|| !hwif
->mate
|| !hwif
->mate
->present
) &&
727 (ide_hwif_request_regions(hwif
))) {
729 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
730 ide_drive_t
*drive
= &hwif
->drives
[unit
];
731 if (drive
->present
) {
733 printk(KERN_ERR
"%s: ERROR, PORTS ALREADY IN USE\n",
739 printk(KERN_ERR
"%s: ports already in use, skipping probe\n",
745 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
746 * we'll install our IRQ driver much later...
750 disable_irq(hwif
->irq
);
752 local_irq_set(flags
);
754 /* This is needed on some PPCs and a bunch of BIOS-less embedded
755 * platforms. Typical cases are:
757 * - The firmware hard reset the disk before booting the kernel,
758 * the drive is still doing it's poweron-reset sequence, that
759 * can take up to 30 seconds
760 * - The firmware does nothing (or no firmware), the device is
761 * still in POST state (same as above actually).
762 * - Some CD/DVD/Writer combo drives tend to drive the bus during
763 * their reset sequence even when they are non-selected slave
764 * devices, thus preventing discovery of the main HD
766 * Doing this wait-for-busy should not harm any existing configuration
767 * (at least things won't be worse than what current code does, that
768 * is blindly go & talk to the drive) and fix some issues like the
773 if (wait_hwif_ready(hwif
) == -EBUSY
)
774 printk(KERN_DEBUG
"%s: Wait for ready failed before probe !\n", hwif
->name
);
777 * Second drive should only exist if first drive was found,
778 * but a lot of cdrom drives are configured as single slaves.
780 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
781 ide_drive_t
*drive
= &hwif
->drives
[unit
];
782 drive
->dn
= (hwif
->channel
? 2 : 0) + unit
;
783 (void) probe_for_drive(drive
);
784 if (drive
->present
&& !hwif
->present
) {
786 if (hwif
->chipset
!= ide_4drives
||
788 !hwif
->mate
->present
) {
793 if (hwif
->io_ports
[IDE_CONTROL_OFFSET
] && hwif
->reset
) {
794 unsigned long timeout
= jiffies
+ WAIT_WORSTCASE
;
797 printk(KERN_WARNING
"%s: reset\n", hwif
->name
);
798 hwif
->OUTB(12, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
800 hwif
->OUTB(8, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
803 stat
= hwif
->INB(hwif
->io_ports
[IDE_STATUS_OFFSET
]);
804 } while ((stat
& BUSY_STAT
) && time_after(timeout
, jiffies
));
807 local_irq_restore(flags
);
809 * Use cached IRQ number. It might be (and is...) changed by probe
815 if (!hwif
->present
) {
816 ide_hwif_release_regions(hwif
);
820 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
821 ide_drive_t
*drive
= &hwif
->drives
[unit
];
823 if (drive
->present
) {
824 if (hwif
->tuneproc
!= NULL
&&
825 drive
->autotune
== IDE_TUNE_AUTO
)
826 /* auto-tune PIO mode */
827 hwif
->tuneproc(drive
, 255);
829 if (drive
->autotune
!= IDE_TUNE_DEFAULT
&&
830 drive
->autotune
!= IDE_TUNE_AUTO
)
836 * MAJOR HACK BARF :-/
838 * FIXME: chipsets own this cruft!
841 * Move here to prevent module loading clashing.
843 // drive->autodma = hwif->autodma;
844 if (hwif
->ide_dma_check
) {
846 * Force DMAing for the beginning of the check.
847 * Some chipsets appear to do interesting
848 * things, if not checked and cleared.
851 hwif
->ide_dma_off_quietly(drive
);
852 #ifdef CONFIG_IDEDMA_ONLYDISK
853 if (drive
->media
== ide_disk
)
855 hwif
->ide_dma_check(drive
);
860 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
861 ide_drive_t
*drive
= &hwif
->drives
[unit
];
863 if (hwif
->no_io_32bit
)
864 drive
->no_io_32bit
= 1;
866 drive
->no_io_32bit
= drive
->id
->dword_io
? 1 : 0;
870 static int hwif_init(ide_hwif_t
*hwif
);
872 int probe_hwif_init_with_fixup(ide_hwif_t
*hwif
, void (*fixup
)(ide_hwif_t
*hwif
))
879 if (!hwif_init(hwif
)) {
880 printk(KERN_INFO
"%s: failed to initialize IDE interface\n",
887 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
888 ide_drive_t
*drive
= &hwif
->drives
[unit
];
889 /* For now don't attach absent drives, we may
890 want them on default or a new "empty" class
891 for hotplug reprobing ? */
892 if (drive
->present
) {
893 device_register(&drive
->gendev
);
900 int probe_hwif_init(ide_hwif_t
*hwif
)
902 return probe_hwif_init_with_fixup(hwif
, NULL
);
905 EXPORT_SYMBOL(probe_hwif_init
);
909 * save_match() is used to simplify logic in init_irq() below.
911 * A loophole here is that we may not know about a particular
912 * hwif's irq until after that hwif is actually probed/initialized..
913 * This could be a problem for the case where an hwif is on a
914 * dual interface that requires serialization (eg. cmd640) and another
915 * hwif using one of the same irqs is initialized beforehand.
917 * This routine detects and reports such situations, but does not fix them.
919 static void save_match(ide_hwif_t
*hwif
, ide_hwif_t
*new, ide_hwif_t
**match
)
921 ide_hwif_t
*m
= *match
;
923 if (m
&& m
->hwgroup
&& m
->hwgroup
!= new->hwgroup
) {
926 printk("%s: potential irq problem with %s and %s\n",
927 hwif
->name
, new->name
, m
->name
);
929 if (!m
|| m
->irq
!= hwif
->irq
) /* don't undo a prior perfect match */
932 #endif /* MAX_HWIFS > 1 */
937 static int ide_init_queue(ide_drive_t
*drive
)
940 ide_hwif_t
*hwif
= HWIF(drive
);
941 int max_sectors
= 256;
942 int max_sg_entries
= PRD_ENTRIES
;
945 * Our default set up assumes the normal IDE case,
946 * that is 64K segmenting, standard PRD setup
947 * and LBA28. Some drivers then impose their own
948 * limits and LBA48 we could raise it but as yet
952 q
= blk_init_queue_node(do_ide_request
, &ide_lock
, hwif_to_node(hwif
));
956 q
->queuedata
= drive
;
957 blk_queue_segment_boundary(q
, 0xffff);
960 if (hwif
->no_lba48
|| hwif
->no_lba48_dma
)
963 hwif
->rqsize
= 65536;
965 if (hwif
->rqsize
< max_sectors
)
966 max_sectors
= hwif
->rqsize
;
967 blk_queue_max_sectors(q
, max_sectors
);
970 /* When we have an IOMMU, we may have a problem where pci_map_sg()
971 * creates segments that don't completely match our boundary
972 * requirements and thus need to be broken up again. Because it
973 * doesn't align properly either, we may actually have to break up
974 * to more segments than what was we got in the first place, a max
975 * worst case is twice as many.
976 * This will be fixed once we teach pci_map_sg() about our boundary
977 * requirements, hopefully soon. *FIXME*
979 if (!PCI_DMA_BUS_IS_PHYS
)
980 max_sg_entries
>>= 1;
981 #endif /* CONFIG_PCI */
983 blk_queue_max_hw_segments(q
, max_sg_entries
);
984 blk_queue_max_phys_segments(q
, max_sg_entries
);
986 /* assign drive queue */
989 /* needs drive->queue to be set */
990 ide_toggle_bounce(drive
, 1);
992 /* enable led activity for disk drives only */
993 if (drive
->media
== ide_disk
&& hwif
->led_act
)
994 blk_queue_activity_fn(q
, hwif
->led_act
, drive
);
1000 * This routine sets up the irq for an ide interface, and creates a new
1001 * hwgroup for the irq/hwif if none was previously assigned.
1003 * Much of the code is for correctly detecting/handling irq sharing
1004 * and irq serialization situations. This is somewhat complex because
1005 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1007 * The IRQF_DISABLED in sa_flags means ide_intr() is always entered with
1008 * interrupts completely disabled. This can be bad for interrupt latency,
1009 * but anything else has led to problems on some machines. We re-enable
1010 * interrupts as much as we can safely do in most places.
1012 static int init_irq (ide_hwif_t
*hwif
)
1015 ide_hwgroup_t
*hwgroup
;
1016 ide_hwif_t
*match
= NULL
;
1019 BUG_ON(in_interrupt());
1020 BUG_ON(irqs_disabled());
1021 BUG_ON(hwif
== NULL
);
1024 hwif
->hwgroup
= NULL
;
1027 * Group up with any other hwifs that share our irq(s).
1029 for (index
= 0; index
< MAX_HWIFS
; index
++) {
1030 ide_hwif_t
*h
= &ide_hwifs
[index
];
1031 if (h
->hwgroup
) { /* scan only initialized hwif's */
1032 if (hwif
->irq
== h
->irq
) {
1033 hwif
->sharing_irq
= h
->sharing_irq
= 1;
1034 if (hwif
->chipset
!= ide_pci
||
1035 h
->chipset
!= ide_pci
) {
1036 save_match(hwif
, h
, &match
);
1039 if (hwif
->serialized
) {
1040 if (hwif
->mate
&& hwif
->mate
->irq
== h
->irq
)
1041 save_match(hwif
, h
, &match
);
1043 if (h
->serialized
) {
1044 if (h
->mate
&& hwif
->irq
== h
->mate
->irq
)
1045 save_match(hwif
, h
, &match
);
1049 #endif /* MAX_HWIFS > 1 */
1051 * If we are still without a hwgroup, then form a new one
1054 hwgroup
= match
->hwgroup
;
1055 hwif
->hwgroup
= hwgroup
;
1057 * Link us into the hwgroup.
1058 * This must be done early, do ensure that unexpected_intr
1059 * can find the hwif and prevent irq storms.
1060 * No drives are attached to the new hwif, choose_drive
1061 * can't do anything stupid (yet).
1062 * Add ourself as the 2nd entry to the hwgroup->hwif
1063 * linked list, the first entry is the hwif that owns
1064 * hwgroup->handler - do not change that.
1066 spin_lock_irq(&ide_lock
);
1067 hwif
->next
= hwgroup
->hwif
->next
;
1068 hwgroup
->hwif
->next
= hwif
;
1069 spin_unlock_irq(&ide_lock
);
1071 hwgroup
= kmalloc_node(sizeof(ide_hwgroup_t
), GFP_KERNEL
,
1072 hwif_to_node(hwif
->drives
[0].hwif
));
1076 hwif
->hwgroup
= hwgroup
;
1078 memset(hwgroup
, 0, sizeof(ide_hwgroup_t
));
1079 hwgroup
->hwif
= hwif
->next
= hwif
;
1081 hwgroup
->handler
= NULL
;
1082 hwgroup
->drive
= NULL
;
1084 init_timer(&hwgroup
->timer
);
1085 hwgroup
->timer
.function
= &ide_timer_expiry
;
1086 hwgroup
->timer
.data
= (unsigned long) hwgroup
;
1090 * Allocate the irq, if not already obtained for another hwif
1092 if (!match
|| match
->irq
!= hwif
->irq
) {
1093 int sa
= IRQF_DISABLED
;
1094 #if defined(__mc68000__) || defined(CONFIG_APUS)
1096 #endif /* __mc68000__ || CONFIG_APUS */
1098 if (IDE_CHIPSET_IS_PCI(hwif
->chipset
)) {
1100 #ifndef CONFIG_IDEPCI_SHARE_IRQ
1101 sa
|= IRQF_DISABLED
;
1102 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
1105 if (hwif
->io_ports
[IDE_CONTROL_OFFSET
])
1107 hwif
->OUTB(0x08, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
1109 if (request_irq(hwif
->irq
,&ide_intr
,sa
,hwif
->name
,hwgroup
))
1114 * For any present drive:
1115 * - allocate the block device queue
1116 * - link drive into the hwgroup
1118 for (index
= 0; index
< MAX_DRIVES
; ++index
) {
1119 ide_drive_t
*drive
= &hwif
->drives
[index
];
1120 if (!drive
->present
)
1122 if (ide_init_queue(drive
)) {
1123 printk(KERN_ERR
"ide: failed to init %s\n",drive
->name
);
1126 spin_lock_irq(&ide_lock
);
1127 if (!hwgroup
->drive
) {
1128 /* first drive for hwgroup. */
1129 drive
->next
= drive
;
1130 hwgroup
->drive
= drive
;
1131 hwgroup
->hwif
= HWIF(hwgroup
->drive
);
1133 drive
->next
= hwgroup
->drive
->next
;
1134 hwgroup
->drive
->next
= drive
;
1136 spin_unlock_irq(&ide_lock
);
1139 #if !defined(__mc68000__) && !defined(CONFIG_APUS)
1140 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif
->name
,
1141 hwif
->io_ports
[IDE_DATA_OFFSET
],
1142 hwif
->io_ports
[IDE_DATA_OFFSET
]+7,
1143 hwif
->io_ports
[IDE_CONTROL_OFFSET
], hwif
->irq
);
1145 printk("%s at 0x%08lx on irq %d", hwif
->name
,
1146 hwif
->io_ports
[IDE_DATA_OFFSET
], hwif
->irq
);
1147 #endif /* __mc68000__ && CONFIG_APUS */
1149 printk(" (%sed with %s)",
1150 hwif
->sharing_irq
? "shar" : "serializ", match
->name
);
1155 spin_lock_irq(&ide_lock
);
1156 if (hwif
->next
== hwif
) {
1158 BUG_ON(hwgroup
->hwif
!= hwif
);
1163 while (g
->next
!= hwif
)
1165 g
->next
= hwif
->next
;
1166 if (hwgroup
->hwif
== hwif
) {
1168 printk(KERN_ERR
"Duh. Uninitialized hwif listed as active hwif.\n");
1171 BUG_ON(hwgroup
->hwif
== hwif
);
1173 spin_unlock_irq(&ide_lock
);
1179 static int ata_lock(dev_t dev
, void *data
)
1181 /* FIXME: we want to pin hwif down */
1185 static struct kobject
*ata_probe(dev_t dev
, int *part
, void *data
)
1187 ide_hwif_t
*hwif
= data
;
1188 int unit
= *part
>> PARTN_BITS
;
1189 ide_drive_t
*drive
= &hwif
->drives
[unit
];
1190 if (!drive
->present
)
1193 if (drive
->media
== ide_disk
)
1194 request_module("ide-disk");
1196 request_module("ide-scsi");
1197 if (drive
->media
== ide_cdrom
|| drive
->media
== ide_optical
)
1198 request_module("ide-cd");
1199 if (drive
->media
== ide_tape
)
1200 request_module("ide-tape");
1201 if (drive
->media
== ide_floppy
)
1202 request_module("ide-floppy");
1207 static struct kobject
*exact_match(dev_t dev
, int *part
, void *data
)
1209 struct gendisk
*p
= data
;
1210 *part
&= (1 << PARTN_BITS
) - 1;
1214 static int exact_lock(dev_t dev
, void *data
)
1216 struct gendisk
*p
= data
;
1223 void ide_register_region(struct gendisk
*disk
)
1225 blk_register_region(MKDEV(disk
->major
, disk
->first_minor
),
1226 disk
->minors
, NULL
, exact_match
, exact_lock
, disk
);
1229 EXPORT_SYMBOL_GPL(ide_register_region
);
1231 void ide_unregister_region(struct gendisk
*disk
)
1233 blk_unregister_region(MKDEV(disk
->major
, disk
->first_minor
),
1237 EXPORT_SYMBOL_GPL(ide_unregister_region
);
1239 void ide_init_disk(struct gendisk
*disk
, ide_drive_t
*drive
)
1241 ide_hwif_t
*hwif
= drive
->hwif
;
1242 unsigned int unit
= (drive
->select
.all
>> 4) & 1;
1244 disk
->major
= hwif
->major
;
1245 disk
->first_minor
= unit
<< PARTN_BITS
;
1246 sprintf(disk
->disk_name
, "hd%c", 'a' + hwif
->index
* MAX_DRIVES
+ unit
);
1247 disk
->queue
= drive
->queue
;
1250 EXPORT_SYMBOL_GPL(ide_init_disk
);
1252 static void ide_remove_drive_from_hwgroup(ide_drive_t
*drive
)
1254 ide_hwgroup_t
*hwgroup
= drive
->hwif
->hwgroup
;
1256 if (drive
== drive
->next
) {
1257 /* special case: last drive from hwgroup. */
1258 BUG_ON(hwgroup
->drive
!= drive
);
1259 hwgroup
->drive
= NULL
;
1263 walk
= hwgroup
->drive
;
1264 while (walk
->next
!= drive
)
1266 walk
->next
= drive
->next
;
1267 if (hwgroup
->drive
== drive
) {
1268 hwgroup
->drive
= drive
->next
;
1269 hwgroup
->hwif
= hwgroup
->drive
->hwif
;
1272 BUG_ON(hwgroup
->drive
== drive
);
1275 static void drive_release_dev (struct device
*dev
)
1277 ide_drive_t
*drive
= container_of(dev
, ide_drive_t
, gendev
);
1279 spin_lock_irq(&ide_lock
);
1280 ide_remove_drive_from_hwgroup(drive
);
1284 /* Messed up locking ... */
1285 spin_unlock_irq(&ide_lock
);
1286 blk_cleanup_queue(drive
->queue
);
1287 spin_lock_irq(&ide_lock
);
1288 drive
->queue
= NULL
;
1289 spin_unlock_irq(&ide_lock
);
1291 complete(&drive
->gendev_rel_comp
);
1295 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1296 * after probing for drives, to allocate partition tables and other data
1297 * structures needed for the routines in genhd.c. ide_geninit() gets called
1298 * somewhat later, during the partition check.
1300 static void init_gendisk (ide_hwif_t
*hwif
)
1304 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
1305 ide_drive_t
* drive
= &hwif
->drives
[unit
];
1306 ide_add_generic_settings(drive
);
1307 snprintf(drive
->gendev
.bus_id
,BUS_ID_SIZE
,"%u.%u",
1309 drive
->gendev
.parent
= &hwif
->gendev
;
1310 drive
->gendev
.bus
= &ide_bus_type
;
1311 drive
->gendev
.driver_data
= drive
;
1312 drive
->gendev
.release
= drive_release_dev
;
1314 blk_register_region(MKDEV(hwif
->major
, 0), MAX_DRIVES
<< PARTN_BITS
,
1315 THIS_MODULE
, ata_probe
, ata_lock
, hwif
);
1318 static int hwif_init(ide_hwif_t
*hwif
)
1322 /* Return success if no device is connected */
1327 if (!(hwif
->irq
= ide_default_irq(hwif
->io_ports
[IDE_DATA_OFFSET
])))
1329 printk("%s: DISABLED, NO IRQ\n", hwif
->name
);
1330 return (hwif
->present
= 0);
1333 #ifdef CONFIG_BLK_DEV_HD
1334 if (hwif
->irq
== HD_IRQ
&& hwif
->io_ports
[IDE_DATA_OFFSET
] != HD_DATA
) {
1335 printk("%s: CANNOT SHARE IRQ WITH OLD "
1336 "HARDDISK DRIVER (hd.c)\n", hwif
->name
);
1337 return (hwif
->present
= 0);
1339 #endif /* CONFIG_BLK_DEV_HD */
1341 /* we set it back to 1 if all is ok below */
1344 if (register_blkdev(hwif
->major
, hwif
->name
))
1347 if (!hwif
->sg_max_nents
)
1348 hwif
->sg_max_nents
= PRD_ENTRIES
;
1350 hwif
->sg_table
= kmalloc(sizeof(struct scatterlist
)*hwif
->sg_max_nents
,
1352 if (!hwif
->sg_table
) {
1353 printk(KERN_ERR
"%s: unable to allocate SG table.\n", hwif
->name
);
1357 if (init_irq(hwif
) == 0)
1360 old_irq
= hwif
->irq
;
1362 * It failed to initialise. Find the default IRQ for
1363 * this port and try that.
1365 if (!(hwif
->irq
= ide_default_irq(hwif
->io_ports
[IDE_DATA_OFFSET
]))) {
1366 printk("%s: Disabled unable to get IRQ %d.\n",
1367 hwif
->name
, old_irq
);
1370 if (init_irq(hwif
)) {
1371 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1372 hwif
->name
, old_irq
, hwif
->irq
);
1375 printk("%s: probed IRQ %d failed, using default.\n",
1376 hwif
->name
, hwif
->irq
);
1380 hwif
->present
= 1; /* success */
1384 unregister_blkdev(hwif
->major
, hwif
->name
);
1388 int ideprobe_init (void)
1391 int probe
[MAX_HWIFS
];
1393 memset(probe
, 0, MAX_HWIFS
* sizeof(int));
1394 for (index
= 0; index
< MAX_HWIFS
; ++index
)
1395 probe
[index
] = !ide_hwifs
[index
].present
;
1397 for (index
= 0; index
< MAX_HWIFS
; ++index
)
1399 probe_hwif(&ide_hwifs
[index
]);
1400 for (index
= 0; index
< MAX_HWIFS
; ++index
)
1402 hwif_init(&ide_hwifs
[index
]);
1403 for (index
= 0; index
< MAX_HWIFS
; ++index
) {
1405 ide_hwif_t
*hwif
= &ide_hwifs
[index
];
1409 if (hwif
->chipset
== ide_unknown
|| hwif
->chipset
== ide_forced
)
1410 hwif
->chipset
= ide_generic
;
1411 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
)
1412 if (hwif
->drives
[unit
].present
)
1413 device_register(&hwif
->drives
[unit
].gendev
);
1419 EXPORT_SYMBOL_GPL(ideprobe_init
);