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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 #include <linux/module.h>
35 #include <linux/types.h>
36 #include <linux/string.h>
37 #include <linux/kernel.h>
38 #include <linux/timer.h>
40 #include <linux/interrupt.h>
41 #include <linux/major.h>
42 #include <linux/errno.h>
43 #include <linux/genhd.h>
44 #include <linux/slab.h>
45 #include <linux/delay.h>
46 #include <linux/ide.h>
47 #include <linux/spinlock.h>
48 #include <linux/kmod.h>
49 #include <linux/pci.h>
51 #include <asm/byteorder.h>
53 #include <asm/uaccess.h>
57 * generic_id - add a generic drive id
58 * @drive: drive to make an ID block for
60 * Add a fake id field to the drive we are passed. This allows
61 * use to skip a ton of NULL checks (which people always miss)
62 * and make drive properties unconditional outside of this file
65 static void generic_id(ide_drive_t
*drive
)
67 drive
->id
->cyls
= drive
->cyl
;
68 drive
->id
->heads
= drive
->head
;
69 drive
->id
->sectors
= drive
->sect
;
70 drive
->id
->cur_cyls
= drive
->cyl
;
71 drive
->id
->cur_heads
= drive
->head
;
72 drive
->id
->cur_sectors
= drive
->sect
;
75 static void ide_disk_init_chs(ide_drive_t
*drive
)
77 struct hd_driveid
*id
= drive
->id
;
79 /* Extract geometry if we did not already have one for the drive */
80 if (!drive
->cyl
|| !drive
->head
|| !drive
->sect
) {
81 drive
->cyl
= drive
->bios_cyl
= id
->cyls
;
82 drive
->head
= drive
->bios_head
= id
->heads
;
83 drive
->sect
= drive
->bios_sect
= id
->sectors
;
86 /* Handle logical geometry translation by the drive */
87 if ((id
->field_valid
& 1) && id
->cur_cyls
&&
88 id
->cur_heads
&& (id
->cur_heads
<= 16) && id
->cur_sectors
) {
89 drive
->cyl
= id
->cur_cyls
;
90 drive
->head
= id
->cur_heads
;
91 drive
->sect
= id
->cur_sectors
;
94 /* Use physical geometry if what we have still makes no sense */
95 if (drive
->head
> 16 && id
->heads
&& id
->heads
<= 16) {
96 drive
->cyl
= id
->cyls
;
97 drive
->head
= id
->heads
;
98 drive
->sect
= id
->sectors
;
102 static void ide_disk_init_mult_count(ide_drive_t
*drive
)
104 struct hd_driveid
*id
= drive
->id
;
106 drive
->mult_count
= 0;
107 if (id
->max_multsect
) {
108 #ifdef CONFIG_IDEDISK_MULTI_MODE
109 id
->multsect
= ((id
->max_multsect
/2) > 1) ? id
->max_multsect
: 0;
110 id
->multsect_valid
= id
->multsect
? 1 : 0;
111 drive
->mult_req
= id
->multsect_valid
? id
->max_multsect
: INITIAL_MULT_COUNT
;
112 drive
->special
.b
.set_multmode
= drive
->mult_req
? 1 : 0;
113 #else /* original, pre IDE-NFG, per request of AC */
114 drive
->mult_req
= INITIAL_MULT_COUNT
;
115 if (drive
->mult_req
> id
->max_multsect
)
116 drive
->mult_req
= id
->max_multsect
;
117 if (drive
->mult_req
|| ((id
->multsect_valid
& 1) && id
->multsect
))
118 drive
->special
.b
.set_multmode
= 1;
124 * do_identify - identify a drive
125 * @drive: drive to identify
128 * Called when we have issued a drive identify command to
129 * read and parse the results. This function is run with
130 * interrupts disabled.
133 static inline void do_identify (ide_drive_t
*drive
, u8 cmd
)
135 ide_hwif_t
*hwif
= HWIF(drive
);
137 struct hd_driveid
*id
;
140 /* read 512 bytes of id info */
141 hwif
->ata_input_data(drive
, id
, SECTOR_WORDS
);
147 #if defined (CONFIG_SCSI_EATA_DMA) || defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
149 * EATA SCSI controllers do a hardware ATA emulation:
150 * Ignore them if there is a driver for them available.
152 if ((id
->model
[0] == 'P' && id
->model
[1] == 'M') ||
153 (id
->model
[0] == 'S' && id
->model
[1] == 'K')) {
154 printk("%s: EATA SCSI HBA %.10s\n", drive
->name
, id
->model
);
157 #endif /* CONFIG_SCSI_EATA_DMA || CONFIG_SCSI_EATA_PIO */
160 * WIN_IDENTIFY returns little-endian info,
161 * WIN_PIDENTIFY *usually* returns little-endian info.
163 if (cmd
== WIN_PIDENTIFY
) {
164 if ((id
->model
[0] == 'N' && id
->model
[1] == 'E') /* NEC */
165 || (id
->model
[0] == 'F' && id
->model
[1] == 'X') /* Mitsumi */
166 || (id
->model
[0] == 'P' && id
->model
[1] == 'i'))/* Pioneer */
167 /* Vertos drives may still be weird */
170 ide_fixstring(id
->model
, sizeof(id
->model
), bswap
);
171 ide_fixstring(id
->fw_rev
, sizeof(id
->fw_rev
), bswap
);
172 ide_fixstring(id
->serial_no
, sizeof(id
->serial_no
), bswap
);
174 if (strstr(id
->model
, "E X A B Y T E N E S T"))
177 /* we depend on this a lot! */
178 id
->model
[sizeof(id
->model
)-1] = '\0';
179 printk("%s: %s, ", drive
->name
, id
->model
);
184 * Check for an ATAPI device
186 if (cmd
== WIN_PIDENTIFY
) {
187 u8 type
= (id
->config
>> 8) & 0x1f;
191 if (!strstr(id
->model
, "CD-ROM")) {
192 if (!strstr(id
->model
, "oppy") &&
193 !strstr(id
->model
, "poyp") &&
194 !strstr(id
->model
, "ZIP"))
195 printk("cdrom or floppy?, assuming ");
196 if (drive
->media
!= ide_cdrom
) {
198 drive
->removable
= 1;
202 /* Early cdrom models used zero */
205 drive
->removable
= 1;
207 /* kludge for Apple PowerBook internal zip */
208 if (!strstr(id
->model
, "CD-ROM") &&
209 strstr(id
->model
, "ZIP")) {
215 printk ("CD/DVD-ROM");
222 drive
->removable
= 1;
225 printk("UNKNOWN (type %d)", type
);
230 /* an ATAPI device ignores DRDY */
231 drive
->ready_stat
= 0;
236 * Not an ATAPI device: looks like a "regular" hard disk
240 * 0x848a = CompactFlash device
241 * These are *not* removable in Linux definition of the term
244 if ((id
->config
!= 0x848a) && (id
->config
& (1<<7)))
245 drive
->removable
= 1;
247 drive
->media
= ide_disk
;
248 printk("%s DISK drive\n", (id
->config
== 0x848a) ? "CFA" : "ATA" );
259 * actual_try_to_identify - send ata/atapi identify
260 * @drive: drive to identify
261 * @cmd: command to use
263 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
264 * and waits for a response. It also monitors irqs while this is
265 * happening, in hope of automatically determining which one is
266 * being used by the interface.
268 * Returns: 0 device was identified
269 * 1 device timed-out (no response to identify request)
270 * 2 device aborted the command (refused to identify itself)
273 static int actual_try_to_identify (ide_drive_t
*drive
, u8 cmd
)
275 ide_hwif_t
*hwif
= HWIF(drive
);
277 unsigned long hd_status
;
278 unsigned long timeout
;
281 /* take a deep breath */
284 if (IDE_CONTROL_REG
) {
285 a
= hwif
->INB(IDE_ALTSTATUS_REG
);
286 s
= hwif
->INB(IDE_STATUS_REG
);
287 if ((a
^ s
) & ~INDEX_STAT
) {
288 printk(KERN_INFO
"%s: probing with STATUS(0x%02x) instead of "
289 "ALTSTATUS(0x%02x)\n", drive
->name
, s
, a
);
290 /* ancient Seagate drives, broken interfaces */
291 hd_status
= IDE_STATUS_REG
;
293 /* use non-intrusive polling */
294 hd_status
= IDE_ALTSTATUS_REG
;
297 hd_status
= IDE_STATUS_REG
;
299 /* set features register for atapi
300 * identify command to be sure of reply
302 if ((cmd
== WIN_PIDENTIFY
))
303 /* disable dma & overlap */
304 hwif
->OUTB(0, IDE_FEATURE_REG
);
306 /* ask drive for ID */
307 hwif
->OUTB(cmd
, IDE_COMMAND_REG
);
309 timeout
= ((cmd
== WIN_IDENTIFY
) ? WAIT_WORSTCASE
: WAIT_PIDENTIFY
) / 2;
312 if (time_after(jiffies
, timeout
)) {
313 /* drive timed-out */
316 /* give drive a breather */
318 } while ((hwif
->INB(hd_status
)) & BUSY_STAT
);
320 /* wait for IRQ and DRQ_STAT */
322 if (OK_STAT((hwif
->INB(IDE_STATUS_REG
)), DRQ_STAT
, BAD_R_STAT
)) {
325 /* local CPU only; some systems need this */
326 local_irq_save(flags
);
327 /* drive returned ID */
328 do_identify(drive
, cmd
);
329 /* drive responded with ID */
331 /* clear drive IRQ */
332 (void) hwif
->INB(IDE_STATUS_REG
);
333 local_irq_restore(flags
);
335 /* drive refused ID */
342 * try_to_identify - try to identify a drive
343 * @drive: drive to probe
344 * @cmd: command to use
346 * Issue the identify command and then do IRQ probing to
347 * complete the identification when needed by finding the
348 * IRQ the drive is attached to
351 static int try_to_identify (ide_drive_t
*drive
, u8 cmd
)
353 ide_hwif_t
*hwif
= HWIF(drive
);
356 unsigned long cookie
= 0;
359 * Disable device irq unless we need to
360 * probe for it. Otherwise we'll get spurious
361 * interrupts during the identify-phase that
362 * the irq handler isn't expecting.
364 if (IDE_CONTROL_REG
) {
365 u8 ctl
= drive
->ctl
| 2;
368 cookie
= probe_irq_on();
369 /* enable device irq */
372 hwif
->OUTB(ctl
, IDE_CONTROL_REG
);
375 retval
= actual_try_to_identify(drive
, cmd
);
379 /* mask device irq */
380 hwif
->OUTB(drive
->ctl
|2, IDE_CONTROL_REG
);
381 /* clear drive IRQ */
382 (void) hwif
->INB(IDE_STATUS_REG
);
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
);
402 * do_probe - probe an IDE device
403 * @drive: drive to probe
404 * @cmd: command to use
406 * do_probe() has the difficult job of finding a drive if it exists,
407 * without getting hung up if it doesn't exist, without trampling on
408 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
410 * If a drive is "known" to exist (from CMOS or kernel parameters),
411 * but does not respond right away, the probe will "hang in there"
412 * for the maximum wait time (about 30 seconds), otherwise it will
413 * exit much more quickly.
415 * Returns: 0 device was identified
416 * 1 device timed-out (no response to identify request)
417 * 2 device aborted the command (refused to identify itself)
418 * 3 bad status from device (possible for ATAPI drives)
419 * 4 probe was not attempted because failure was obvious
422 static int do_probe (ide_drive_t
*drive
, u8 cmd
)
425 ide_hwif_t
*hwif
= HWIF(drive
);
427 if (drive
->present
) {
428 /* avoid waiting for inappropriate probes */
429 if ((drive
->media
!= ide_disk
) && (cmd
== WIN_IDENTIFY
))
433 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
434 drive
->name
, drive
->present
, drive
->media
,
435 (cmd
== WIN_IDENTIFY
) ? "ATA" : "ATAPI");
438 /* needed for some systems
439 * (e.g. crw9624 as drive0 with disk as slave)
444 if (hwif
->INB(IDE_SELECT_REG
) != drive
->select
.all
&& !drive
->present
) {
445 if (drive
->select
.b
.unit
!= 0) {
446 /* exit with drive0 selected */
447 SELECT_DRIVE(&hwif
->drives
[0]);
448 /* allow BUSY_STAT to assert & clear */
451 /* no i/f present: mmm.. this should be a 4 -ml */
455 if (OK_STAT((hwif
->INB(IDE_STATUS_REG
)), READY_STAT
, BUSY_STAT
) ||
456 drive
->present
|| cmd
== WIN_PIDENTIFY
) {
457 /* send cmd and wait */
458 if ((rc
= try_to_identify(drive
, cmd
))) {
459 /* failed: try again */
460 rc
= try_to_identify(drive
,cmd
);
462 if (hwif
->INB(IDE_STATUS_REG
) == (BUSY_STAT
|READY_STAT
))
465 if ((rc
== 1 && cmd
== WIN_PIDENTIFY
) &&
466 ((drive
->autotune
== IDE_TUNE_DEFAULT
) ||
467 (drive
->autotune
== IDE_TUNE_AUTO
))) {
468 unsigned long timeout
;
469 printk("%s: no response (status = 0x%02x), "
470 "resetting drive\n", drive
->name
,
471 hwif
->INB(IDE_STATUS_REG
));
473 hwif
->OUTB(drive
->select
.all
, IDE_SELECT_REG
);
475 hwif
->OUTB(WIN_SRST
, IDE_COMMAND_REG
);
477 while (((hwif
->INB(IDE_STATUS_REG
)) & BUSY_STAT
) &&
478 time_before(jiffies
, timeout
+ WAIT_WORSTCASE
))
480 rc
= try_to_identify(drive
, cmd
);
483 printk("%s: no response (status = 0x%02x)\n",
484 drive
->name
, hwif
->INB(IDE_STATUS_REG
));
485 /* ensure drive irq is clear */
486 (void) hwif
->INB(IDE_STATUS_REG
);
488 /* not present or maybe ATAPI */
491 if (drive
->select
.b
.unit
!= 0) {
492 /* exit with drive0 selected */
493 SELECT_DRIVE(&hwif
->drives
[0]);
495 /* ensure drive irq is clear */
496 (void) hwif
->INB(IDE_STATUS_REG
);
504 static void enable_nest (ide_drive_t
*drive
)
506 ide_hwif_t
*hwif
= HWIF(drive
);
507 unsigned long timeout
;
509 printk("%s: enabling %s -- ", hwif
->name
, drive
->id
->model
);
512 hwif
->OUTB(EXABYTE_ENABLE_NEST
, IDE_COMMAND_REG
);
513 timeout
= jiffies
+ WAIT_WORSTCASE
;
515 if (time_after(jiffies
, timeout
)) {
516 printk("failed (timeout)\n");
520 } while ((hwif
->INB(IDE_STATUS_REG
)) & BUSY_STAT
);
524 if (!OK_STAT((hwif
->INB(IDE_STATUS_REG
)), 0, BAD_STAT
)) {
525 printk("failed (status = 0x%02x)\n", hwif
->INB(IDE_STATUS_REG
));
530 /* if !(success||timed-out) */
531 if (do_probe(drive
, WIN_IDENTIFY
) >= 2) {
532 /* look for ATAPI device */
533 (void) do_probe(drive
, WIN_PIDENTIFY
);
538 * probe_for_drives - upper level drive probe
539 * @drive: drive to probe for
541 * probe_for_drive() tests for existence of a given drive using do_probe()
542 * and presents things to the user as needed.
544 * Returns: 0 no device was found
545 * 1 device was found (note: drive->present might
549 static inline u8
probe_for_drive (ide_drive_t
*drive
)
552 * In order to keep things simple we have an id
553 * block for all drives at all times. If the device
554 * is pre ATA or refuses ATA/ATAPI identify we
555 * will add faked data to this.
557 * Also note that 0 everywhere means "can't do X"
560 drive
->id
= kzalloc(SECTOR_WORDS
*4, GFP_KERNEL
);
562 if(drive
->id
== NULL
)
564 printk(KERN_ERR
"ide: out of memory for id data.\n");
567 strcpy(drive
->id
->model
, "UNKNOWN");
572 /* if !(success||timed-out) */
573 if (do_probe(drive
, WIN_IDENTIFY
) >= 2) {
574 /* look for ATAPI device */
575 (void) do_probe(drive
, WIN_PIDENTIFY
);
578 /* drive not found */
580 if (strstr(drive
->id
->model
, "E X A B Y T E N E S T"))
583 /* identification failed? */
584 if (!drive
->id_read
) {
585 if (drive
->media
== ide_disk
) {
586 printk(KERN_INFO
"%s: non-IDE drive, CHS=%d/%d/%d\n",
587 drive
->name
, drive
->cyl
,
588 drive
->head
, drive
->sect
);
589 } else if (drive
->media
== ide_cdrom
) {
590 printk(KERN_INFO
"%s: ATAPI cdrom (?)\n", drive
->name
);
593 printk(KERN_WARNING
"%s: Unknown device on bus refused identification. Ignoring.\n", drive
->name
);
597 /* drive was found */
601 /* The drive wasn't being helpful. Add generic info only */
602 if (drive
->id_read
== 0) {
607 if (drive
->media
== ide_disk
) {
608 ide_disk_init_chs(drive
);
609 ide_disk_init_mult_count(drive
);
612 return drive
->present
;
615 static void hwif_release_dev (struct device
*dev
)
617 ide_hwif_t
*hwif
= container_of(dev
, ide_hwif_t
, gendev
);
619 complete(&hwif
->gendev_rel_comp
);
622 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 ret
= device_register(&hwif
->gendev
);
639 printk(KERN_WARNING
"IDE: %s: device_register error: %d\n",
643 static int wait_hwif_ready(ide_hwif_t
*hwif
)
647 printk(KERN_DEBUG
"Probing IDE interface %s...\n", hwif
->name
);
649 /* Let HW settle down a bit from whatever init state we
653 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
654 * I know of at least one disk who takes 31 seconds, I use 35
657 rc
= ide_wait_not_busy(hwif
, 35000);
661 /* Now make sure both master & slave are ready */
662 SELECT_DRIVE(&hwif
->drives
[0]);
663 hwif
->OUTB(8, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
665 rc
= ide_wait_not_busy(hwif
, 35000);
668 SELECT_DRIVE(&hwif
->drives
[1]);
669 hwif
->OUTB(8, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
671 rc
= ide_wait_not_busy(hwif
, 35000);
673 /* Exit function with master reselected (let's be sane) */
674 SELECT_DRIVE(&hwif
->drives
[0]);
680 * ide_undecoded_slave - look for bad CF adapters
683 * Analyse the drives on the interface and attempt to decide if we
684 * have the same drive viewed twice. This occurs with crap CF adapters
685 * and PCMCIA sometimes.
688 void ide_undecoded_slave(ide_hwif_t
*hwif
)
690 ide_drive_t
*drive0
= &hwif
->drives
[0];
691 ide_drive_t
*drive1
= &hwif
->drives
[1];
693 if (drive0
->present
== 0 || drive1
->present
== 0)
696 /* If the models don't match they are not the same product */
697 if (strcmp(drive0
->id
->model
, drive1
->id
->model
))
700 /* Serial numbers do not match */
701 if (strncmp(drive0
->id
->serial_no
, drive1
->id
->serial_no
, 20))
704 /* No serial number, thankfully very rare for CF */
705 if (drive0
->id
->serial_no
[0] == 0)
708 /* Appears to be an IDE flash adapter with decode bugs */
709 printk(KERN_WARNING
"ide-probe: ignoring undecoded slave\n");
714 EXPORT_SYMBOL_GPL(ide_undecoded_slave
);
717 * This routine only knows how to look for drive units 0 and 1
718 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
720 static void probe_hwif(ide_hwif_t
*hwif
, void (*fixup
)(ide_hwif_t
*hwif
))
729 if ((hwif
->chipset
!= ide_4drives
|| !hwif
->mate
|| !hwif
->mate
->present
) &&
730 (ide_hwif_request_regions(hwif
))) {
732 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
733 ide_drive_t
*drive
= &hwif
->drives
[unit
];
734 if (drive
->present
) {
736 printk(KERN_ERR
"%s: ERROR, PORTS ALREADY IN USE\n",
742 printk(KERN_ERR
"%s: ports already in use, skipping probe\n",
748 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
749 * we'll install our IRQ driver much later...
753 disable_irq(hwif
->irq
);
755 local_irq_set(flags
);
757 /* This is needed on some PPCs and a bunch of BIOS-less embedded
758 * platforms. Typical cases are:
760 * - The firmware hard reset the disk before booting the kernel,
761 * the drive is still doing it's poweron-reset sequence, that
762 * can take up to 30 seconds
763 * - The firmware does nothing (or no firmware), the device is
764 * still in POST state (same as above actually).
765 * - Some CD/DVD/Writer combo drives tend to drive the bus during
766 * their reset sequence even when they are non-selected slave
767 * devices, thus preventing discovery of the main HD
769 * Doing this wait-for-busy should not harm any existing configuration
770 * (at least things won't be worse than what current code does, that
771 * is blindly go & talk to the drive) and fix some issues like the
776 if (wait_hwif_ready(hwif
) == -EBUSY
)
777 printk(KERN_DEBUG
"%s: Wait for ready failed before probe !\n", hwif
->name
);
780 * Second drive should only exist if first drive was found,
781 * but a lot of cdrom drives are configured as single slaves.
783 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
784 ide_drive_t
*drive
= &hwif
->drives
[unit
];
785 drive
->dn
= (hwif
->channel
? 2 : 0) + unit
;
786 (void) probe_for_drive(drive
);
787 if (drive
->present
&& !hwif
->present
) {
789 if (hwif
->chipset
!= ide_4drives
||
791 !hwif
->mate
->present
) {
796 if (hwif
->io_ports
[IDE_CONTROL_OFFSET
] && hwif
->reset
) {
797 unsigned long timeout
= jiffies
+ WAIT_WORSTCASE
;
800 printk(KERN_WARNING
"%s: reset\n", hwif
->name
);
801 hwif
->OUTB(12, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
803 hwif
->OUTB(8, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
806 stat
= hwif
->INB(hwif
->io_ports
[IDE_STATUS_OFFSET
]);
807 } while ((stat
& BUSY_STAT
) && time_after(timeout
, jiffies
));
810 local_irq_restore(flags
);
812 * Use cached IRQ number. It might be (and is...) changed by probe
818 if (!hwif
->present
) {
819 ide_hwif_release_regions(hwif
);
826 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
827 ide_drive_t
*drive
= &hwif
->drives
[unit
];
829 if (drive
->present
) {
830 if (hwif
->tuneproc
!= NULL
&&
831 drive
->autotune
== IDE_TUNE_AUTO
)
832 /* auto-tune PIO mode */
833 hwif
->tuneproc(drive
, 255);
835 if (drive
->autotune
!= IDE_TUNE_DEFAULT
&&
836 drive
->autotune
!= IDE_TUNE_AUTO
)
842 * MAJOR HACK BARF :-/
844 * FIXME: chipsets own this cruft!
847 * Move here to prevent module loading clashing.
849 // drive->autodma = hwif->autodma;
850 if (hwif
->ide_dma_check
) {
852 * Force DMAing for the beginning of the check.
853 * Some chipsets appear to do interesting
854 * things, if not checked and cleared.
857 hwif
->dma_off_quietly(drive
);
858 #ifdef CONFIG_IDEDMA_ONLYDISK
859 if (drive
->media
== ide_disk
)
866 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
867 ide_drive_t
*drive
= &hwif
->drives
[unit
];
869 if (hwif
->no_io_32bit
)
870 drive
->no_io_32bit
= 1;
872 drive
->no_io_32bit
= drive
->id
->dword_io
? 1 : 0;
876 static int hwif_init(ide_hwif_t
*hwif
);
878 int probe_hwif_init_with_fixup(ide_hwif_t
*hwif
, void (*fixup
)(ide_hwif_t
*hwif
))
880 probe_hwif(hwif
, fixup
);
882 if (!hwif_init(hwif
)) {
883 printk(KERN_INFO
"%s: failed to initialize IDE interface\n",
892 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
893 ide_drive_t
*drive
= &hwif
->drives
[unit
];
894 /* For now don't attach absent drives, we may
895 want them on default or a new "empty" class
896 for hotplug reprobing ? */
897 if (drive
->present
) {
898 ret
= device_register(&drive
->gendev
);
900 printk(KERN_WARNING
"IDE: %s: "
901 "device_register error: %d\n",
909 int probe_hwif_init(ide_hwif_t
*hwif
)
911 return probe_hwif_init_with_fixup(hwif
, NULL
);
914 EXPORT_SYMBOL(probe_hwif_init
);
918 * save_match() is used to simplify logic in init_irq() below.
920 * A loophole here is that we may not know about a particular
921 * hwif's irq until after that hwif is actually probed/initialized..
922 * This could be a problem for the case where an hwif is on a
923 * dual interface that requires serialization (eg. cmd640) and another
924 * hwif using one of the same irqs is initialized beforehand.
926 * This routine detects and reports such situations, but does not fix them.
928 static void save_match(ide_hwif_t
*hwif
, ide_hwif_t
*new, ide_hwif_t
**match
)
930 ide_hwif_t
*m
= *match
;
932 if (m
&& m
->hwgroup
&& m
->hwgroup
!= new->hwgroup
) {
935 printk("%s: potential irq problem with %s and %s\n",
936 hwif
->name
, new->name
, m
->name
);
938 if (!m
|| m
->irq
!= hwif
->irq
) /* don't undo a prior perfect match */
941 #endif /* MAX_HWIFS > 1 */
946 static int ide_init_queue(ide_drive_t
*drive
)
949 ide_hwif_t
*hwif
= HWIF(drive
);
950 int max_sectors
= 256;
951 int max_sg_entries
= PRD_ENTRIES
;
954 * Our default set up assumes the normal IDE case,
955 * that is 64K segmenting, standard PRD setup
956 * and LBA28. Some drivers then impose their own
957 * limits and LBA48 we could raise it but as yet
961 q
= blk_init_queue_node(do_ide_request
, &ide_lock
, hwif_to_node(hwif
));
965 q
->queuedata
= drive
;
966 blk_queue_segment_boundary(q
, 0xffff);
969 if (hwif
->no_lba48
|| hwif
->no_lba48_dma
)
972 hwif
->rqsize
= 65536;
974 if (hwif
->rqsize
< max_sectors
)
975 max_sectors
= hwif
->rqsize
;
976 blk_queue_max_sectors(q
, max_sectors
);
979 /* When we have an IOMMU, we may have a problem where pci_map_sg()
980 * creates segments that don't completely match our boundary
981 * requirements and thus need to be broken up again. Because it
982 * doesn't align properly either, we may actually have to break up
983 * to more segments than what was we got in the first place, a max
984 * worst case is twice as many.
985 * This will be fixed once we teach pci_map_sg() about our boundary
986 * requirements, hopefully soon. *FIXME*
988 if (!PCI_DMA_BUS_IS_PHYS
)
989 max_sg_entries
>>= 1;
990 #endif /* CONFIG_PCI */
992 blk_queue_max_hw_segments(q
, max_sg_entries
);
993 blk_queue_max_phys_segments(q
, max_sg_entries
);
995 /* assign drive queue */
998 /* needs drive->queue to be set */
999 ide_toggle_bounce(drive
, 1);
1005 * This routine sets up the irq for an ide interface, and creates a new
1006 * hwgroup for the irq/hwif if none was previously assigned.
1008 * Much of the code is for correctly detecting/handling irq sharing
1009 * and irq serialization situations. This is somewhat complex because
1010 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1012 * The IRQF_DISABLED in sa_flags means ide_intr() is always entered with
1013 * interrupts completely disabled. This can be bad for interrupt latency,
1014 * but anything else has led to problems on some machines. We re-enable
1015 * interrupts as much as we can safely do in most places.
1017 static int init_irq (ide_hwif_t
*hwif
)
1020 ide_hwgroup_t
*hwgroup
;
1021 ide_hwif_t
*match
= NULL
;
1024 BUG_ON(in_interrupt());
1025 BUG_ON(irqs_disabled());
1026 BUG_ON(hwif
== NULL
);
1029 hwif
->hwgroup
= NULL
;
1032 * Group up with any other hwifs that share our irq(s).
1034 for (index
= 0; index
< MAX_HWIFS
; index
++) {
1035 ide_hwif_t
*h
= &ide_hwifs
[index
];
1036 if (h
->hwgroup
) { /* scan only initialized hwif's */
1037 if (hwif
->irq
== h
->irq
) {
1038 hwif
->sharing_irq
= h
->sharing_irq
= 1;
1039 if (hwif
->chipset
!= ide_pci
||
1040 h
->chipset
!= ide_pci
) {
1041 save_match(hwif
, h
, &match
);
1044 if (hwif
->serialized
) {
1045 if (hwif
->mate
&& hwif
->mate
->irq
== h
->irq
)
1046 save_match(hwif
, h
, &match
);
1048 if (h
->serialized
) {
1049 if (h
->mate
&& hwif
->irq
== h
->mate
->irq
)
1050 save_match(hwif
, h
, &match
);
1054 #endif /* MAX_HWIFS > 1 */
1056 * If we are still without a hwgroup, then form a new one
1059 hwgroup
= match
->hwgroup
;
1060 hwif
->hwgroup
= hwgroup
;
1062 * Link us into the hwgroup.
1063 * This must be done early, do ensure that unexpected_intr
1064 * can find the hwif and prevent irq storms.
1065 * No drives are attached to the new hwif, choose_drive
1066 * can't do anything stupid (yet).
1067 * Add ourself as the 2nd entry to the hwgroup->hwif
1068 * linked list, the first entry is the hwif that owns
1069 * hwgroup->handler - do not change that.
1071 spin_lock_irq(&ide_lock
);
1072 hwif
->next
= hwgroup
->hwif
->next
;
1073 hwgroup
->hwif
->next
= hwif
;
1074 spin_unlock_irq(&ide_lock
);
1076 hwgroup
= kmalloc_node(sizeof(ide_hwgroup_t
), GFP_KERNEL
,
1077 hwif_to_node(hwif
->drives
[0].hwif
));
1081 hwif
->hwgroup
= hwgroup
;
1083 memset(hwgroup
, 0, sizeof(ide_hwgroup_t
));
1084 hwgroup
->hwif
= hwif
->next
= hwif
;
1086 hwgroup
->handler
= NULL
;
1087 hwgroup
->drive
= NULL
;
1089 init_timer(&hwgroup
->timer
);
1090 hwgroup
->timer
.function
= &ide_timer_expiry
;
1091 hwgroup
->timer
.data
= (unsigned long) hwgroup
;
1095 * Allocate the irq, if not already obtained for another hwif
1097 if (!match
|| match
->irq
!= hwif
->irq
) {
1098 int sa
= IRQF_DISABLED
;
1099 #if defined(__mc68000__) || defined(CONFIG_APUS)
1101 #endif /* __mc68000__ || CONFIG_APUS */
1103 if (IDE_CHIPSET_IS_PCI(hwif
->chipset
)) {
1105 #ifndef CONFIG_IDEPCI_SHARE_IRQ
1106 sa
|= IRQF_DISABLED
;
1107 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
1110 if (hwif
->io_ports
[IDE_CONTROL_OFFSET
])
1112 hwif
->OUTB(0x08, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
1114 if (request_irq(hwif
->irq
,&ide_intr
,sa
,hwif
->name
,hwgroup
))
1119 * For any present drive:
1120 * - allocate the block device queue
1121 * - link drive into the hwgroup
1123 for (index
= 0; index
< MAX_DRIVES
; ++index
) {
1124 ide_drive_t
*drive
= &hwif
->drives
[index
];
1125 if (!drive
->present
)
1127 if (ide_init_queue(drive
)) {
1128 printk(KERN_ERR
"ide: failed to init %s\n",drive
->name
);
1131 spin_lock_irq(&ide_lock
);
1132 if (!hwgroup
->drive
) {
1133 /* first drive for hwgroup. */
1134 drive
->next
= drive
;
1135 hwgroup
->drive
= drive
;
1136 hwgroup
->hwif
= HWIF(hwgroup
->drive
);
1138 drive
->next
= hwgroup
->drive
->next
;
1139 hwgroup
->drive
->next
= drive
;
1141 spin_unlock_irq(&ide_lock
);
1144 #if !defined(__mc68000__) && !defined(CONFIG_APUS)
1145 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif
->name
,
1146 hwif
->io_ports
[IDE_DATA_OFFSET
],
1147 hwif
->io_ports
[IDE_DATA_OFFSET
]+7,
1148 hwif
->io_ports
[IDE_CONTROL_OFFSET
], hwif
->irq
);
1150 printk("%s at 0x%08lx on irq %d", hwif
->name
,
1151 hwif
->io_ports
[IDE_DATA_OFFSET
], hwif
->irq
);
1152 #endif /* __mc68000__ && CONFIG_APUS */
1154 printk(" (%sed with %s)",
1155 hwif
->sharing_irq
? "shar" : "serializ", match
->name
);
1160 spin_lock_irq(&ide_lock
);
1161 if (hwif
->next
== hwif
) {
1163 BUG_ON(hwgroup
->hwif
!= hwif
);
1168 while (g
->next
!= hwif
)
1170 g
->next
= hwif
->next
;
1171 if (hwgroup
->hwif
== hwif
) {
1173 printk(KERN_ERR
"Duh. Uninitialized hwif listed as active hwif.\n");
1176 BUG_ON(hwgroup
->hwif
== hwif
);
1178 spin_unlock_irq(&ide_lock
);
1184 static int ata_lock(dev_t dev
, void *data
)
1186 /* FIXME: we want to pin hwif down */
1190 static struct kobject
*ata_probe(dev_t dev
, int *part
, void *data
)
1192 ide_hwif_t
*hwif
= data
;
1193 int unit
= *part
>> PARTN_BITS
;
1194 ide_drive_t
*drive
= &hwif
->drives
[unit
];
1195 if (!drive
->present
)
1198 if (drive
->media
== ide_disk
)
1199 request_module("ide-disk");
1201 request_module("ide-scsi");
1202 if (drive
->media
== ide_cdrom
|| drive
->media
== ide_optical
)
1203 request_module("ide-cd");
1204 if (drive
->media
== ide_tape
)
1205 request_module("ide-tape");
1206 if (drive
->media
== ide_floppy
)
1207 request_module("ide-floppy");
1212 static struct kobject
*exact_match(dev_t dev
, int *part
, void *data
)
1214 struct gendisk
*p
= data
;
1215 *part
&= (1 << PARTN_BITS
) - 1;
1219 static int exact_lock(dev_t dev
, void *data
)
1221 struct gendisk
*p
= data
;
1228 void ide_register_region(struct gendisk
*disk
)
1230 blk_register_region(MKDEV(disk
->major
, disk
->first_minor
),
1231 disk
->minors
, NULL
, exact_match
, exact_lock
, disk
);
1234 EXPORT_SYMBOL_GPL(ide_register_region
);
1236 void ide_unregister_region(struct gendisk
*disk
)
1238 blk_unregister_region(MKDEV(disk
->major
, disk
->first_minor
),
1242 EXPORT_SYMBOL_GPL(ide_unregister_region
);
1244 void ide_init_disk(struct gendisk
*disk
, ide_drive_t
*drive
)
1246 ide_hwif_t
*hwif
= drive
->hwif
;
1247 unsigned int unit
= (drive
->select
.all
>> 4) & 1;
1249 disk
->major
= hwif
->major
;
1250 disk
->first_minor
= unit
<< PARTN_BITS
;
1251 sprintf(disk
->disk_name
, "hd%c", 'a' + hwif
->index
* MAX_DRIVES
+ unit
);
1252 disk
->queue
= drive
->queue
;
1255 EXPORT_SYMBOL_GPL(ide_init_disk
);
1257 static void ide_remove_drive_from_hwgroup(ide_drive_t
*drive
)
1259 ide_hwgroup_t
*hwgroup
= drive
->hwif
->hwgroup
;
1261 if (drive
== drive
->next
) {
1262 /* special case: last drive from hwgroup. */
1263 BUG_ON(hwgroup
->drive
!= drive
);
1264 hwgroup
->drive
= NULL
;
1268 walk
= hwgroup
->drive
;
1269 while (walk
->next
!= drive
)
1271 walk
->next
= drive
->next
;
1272 if (hwgroup
->drive
== drive
) {
1273 hwgroup
->drive
= drive
->next
;
1274 hwgroup
->hwif
= hwgroup
->drive
->hwif
;
1277 BUG_ON(hwgroup
->drive
== drive
);
1280 static void drive_release_dev (struct device
*dev
)
1282 ide_drive_t
*drive
= container_of(dev
, ide_drive_t
, gendev
);
1284 spin_lock_irq(&ide_lock
);
1285 ide_remove_drive_from_hwgroup(drive
);
1289 /* Messed up locking ... */
1290 spin_unlock_irq(&ide_lock
);
1291 blk_cleanup_queue(drive
->queue
);
1292 spin_lock_irq(&ide_lock
);
1293 drive
->queue
= NULL
;
1294 spin_unlock_irq(&ide_lock
);
1296 complete(&drive
->gendev_rel_comp
);
1300 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1301 * after probing for drives, to allocate partition tables and other data
1302 * structures needed for the routines in genhd.c. ide_geninit() gets called
1303 * somewhat later, during the partition check.
1305 static void init_gendisk (ide_hwif_t
*hwif
)
1309 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
1310 ide_drive_t
* drive
= &hwif
->drives
[unit
];
1311 ide_add_generic_settings(drive
);
1312 snprintf(drive
->gendev
.bus_id
,BUS_ID_SIZE
,"%u.%u",
1314 drive
->gendev
.parent
= &hwif
->gendev
;
1315 drive
->gendev
.bus
= &ide_bus_type
;
1316 drive
->gendev
.driver_data
= drive
;
1317 drive
->gendev
.release
= drive_release_dev
;
1319 blk_register_region(MKDEV(hwif
->major
, 0), MAX_DRIVES
<< PARTN_BITS
,
1320 THIS_MODULE
, ata_probe
, ata_lock
, hwif
);
1323 static int hwif_init(ide_hwif_t
*hwif
)
1327 /* Return success if no device is connected */
1332 if (!(hwif
->irq
= ide_default_irq(hwif
->io_ports
[IDE_DATA_OFFSET
])))
1334 printk("%s: DISABLED, NO IRQ\n", hwif
->name
);
1335 return (hwif
->present
= 0);
1338 #ifdef CONFIG_BLK_DEV_HD
1339 if (hwif
->irq
== HD_IRQ
&& hwif
->io_ports
[IDE_DATA_OFFSET
] != HD_DATA
) {
1340 printk("%s: CANNOT SHARE IRQ WITH OLD "
1341 "HARDDISK DRIVER (hd.c)\n", hwif
->name
);
1342 return (hwif
->present
= 0);
1344 #endif /* CONFIG_BLK_DEV_HD */
1346 /* we set it back to 1 if all is ok below */
1349 if (register_blkdev(hwif
->major
, hwif
->name
))
1352 if (!hwif
->sg_max_nents
)
1353 hwif
->sg_max_nents
= PRD_ENTRIES
;
1355 hwif
->sg_table
= kmalloc(sizeof(struct scatterlist
)*hwif
->sg_max_nents
,
1357 if (!hwif
->sg_table
) {
1358 printk(KERN_ERR
"%s: unable to allocate SG table.\n", hwif
->name
);
1362 if (init_irq(hwif
) == 0)
1365 old_irq
= hwif
->irq
;
1367 * It failed to initialise. Find the default IRQ for
1368 * this port and try that.
1370 if (!(hwif
->irq
= ide_default_irq(hwif
->io_ports
[IDE_DATA_OFFSET
]))) {
1371 printk("%s: Disabled unable to get IRQ %d.\n",
1372 hwif
->name
, old_irq
);
1375 if (init_irq(hwif
)) {
1376 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1377 hwif
->name
, old_irq
, hwif
->irq
);
1380 printk("%s: probed IRQ %d failed, using default.\n",
1381 hwif
->name
, hwif
->irq
);
1386 ide_acpi_init(hwif
);
1388 hwif
->present
= 1; /* success */
1392 unregister_blkdev(hwif
->major
, hwif
->name
);
1396 int ideprobe_init (void)
1399 int probe
[MAX_HWIFS
];
1401 memset(probe
, 0, MAX_HWIFS
* sizeof(int));
1402 for (index
= 0; index
< MAX_HWIFS
; ++index
)
1403 probe
[index
] = !ide_hwifs
[index
].present
;
1405 for (index
= 0; index
< MAX_HWIFS
; ++index
)
1407 probe_hwif(&ide_hwifs
[index
], NULL
);
1408 for (index
= 0; index
< MAX_HWIFS
; ++index
)
1410 hwif_init(&ide_hwifs
[index
]);
1411 for (index
= 0; index
< MAX_HWIFS
; ++index
) {
1413 ide_hwif_t
*hwif
= &ide_hwifs
[index
];
1417 if (hwif
->chipset
== ide_unknown
|| hwif
->chipset
== ide_forced
)
1418 hwif
->chipset
= ide_generic
;
1419 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
)
1420 if (hwif
->drives
[unit
].present
) {
1421 int ret
= device_register(
1422 &hwif
->drives
[unit
].gendev
);
1424 printk(KERN_WARNING
"IDE: %s: "
1425 "device_register error: %d\n",
1430 for (index
= 0; index
< MAX_HWIFS
; ++index
)
1432 ide_proc_register_port(&ide_hwifs
[index
]);
1436 EXPORT_SYMBOL_GPL(ideprobe_init
);