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>
50 #include <linux/scatterlist.h>
52 #include <asm/byteorder.h>
54 #include <asm/uaccess.h>
58 * generic_id - add a generic drive id
59 * @drive: drive to make an ID block for
61 * Add a fake id field to the drive we are passed. This allows
62 * use to skip a ton of NULL checks (which people always miss)
63 * and make drive properties unconditional outside of this file
66 static void generic_id(ide_drive_t
*drive
)
68 drive
->id
->cyls
= drive
->cyl
;
69 drive
->id
->heads
= drive
->head
;
70 drive
->id
->sectors
= drive
->sect
;
71 drive
->id
->cur_cyls
= drive
->cyl
;
72 drive
->id
->cur_heads
= drive
->head
;
73 drive
->id
->cur_sectors
= drive
->sect
;
76 static void ide_disk_init_chs(ide_drive_t
*drive
)
78 struct hd_driveid
*id
= drive
->id
;
80 /* Extract geometry if we did not already have one for the drive */
81 if (!drive
->cyl
|| !drive
->head
|| !drive
->sect
) {
82 drive
->cyl
= drive
->bios_cyl
= id
->cyls
;
83 drive
->head
= drive
->bios_head
= id
->heads
;
84 drive
->sect
= drive
->bios_sect
= id
->sectors
;
87 /* Handle logical geometry translation by the drive */
88 if ((id
->field_valid
& 1) && id
->cur_cyls
&&
89 id
->cur_heads
&& (id
->cur_heads
<= 16) && id
->cur_sectors
) {
90 drive
->cyl
= id
->cur_cyls
;
91 drive
->head
= id
->cur_heads
;
92 drive
->sect
= id
->cur_sectors
;
95 /* Use physical geometry if what we have still makes no sense */
96 if (drive
->head
> 16 && id
->heads
&& id
->heads
<= 16) {
97 drive
->cyl
= id
->cyls
;
98 drive
->head
= id
->heads
;
99 drive
->sect
= id
->sectors
;
103 static void ide_disk_init_mult_count(ide_drive_t
*drive
)
105 struct hd_driveid
*id
= drive
->id
;
107 drive
->mult_count
= 0;
108 if (id
->max_multsect
) {
109 #ifdef CONFIG_IDEDISK_MULTI_MODE
110 id
->multsect
= ((id
->max_multsect
/2) > 1) ? id
->max_multsect
: 0;
111 id
->multsect_valid
= id
->multsect
? 1 : 0;
112 drive
->mult_req
= id
->multsect_valid
? id
->max_multsect
: INITIAL_MULT_COUNT
;
113 drive
->special
.b
.set_multmode
= drive
->mult_req
? 1 : 0;
114 #else /* original, pre IDE-NFG, per request of AC */
115 drive
->mult_req
= INITIAL_MULT_COUNT
;
116 if (drive
->mult_req
> id
->max_multsect
)
117 drive
->mult_req
= id
->max_multsect
;
118 if (drive
->mult_req
|| ((id
->multsect_valid
& 1) && id
->multsect
))
119 drive
->special
.b
.set_multmode
= 1;
125 * do_identify - identify a drive
126 * @drive: drive to identify
129 * Called when we have issued a drive identify command to
130 * read and parse the results. This function is run with
131 * interrupts disabled.
134 static inline void do_identify (ide_drive_t
*drive
, u8 cmd
)
136 ide_hwif_t
*hwif
= HWIF(drive
);
138 struct hd_driveid
*id
;
141 /* read 512 bytes of id info */
142 hwif
->ata_input_data(drive
, id
, SECTOR_WORDS
);
148 #if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
150 * EATA SCSI controllers do a hardware ATA emulation:
151 * Ignore them if there is a driver for them available.
153 if ((id
->model
[0] == 'P' && id
->model
[1] == 'M') ||
154 (id
->model
[0] == 'S' && id
->model
[1] == 'K')) {
155 printk("%s: EATA SCSI HBA %.10s\n", drive
->name
, id
->model
);
158 #endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
161 * WIN_IDENTIFY returns little-endian info,
162 * WIN_PIDENTIFY *usually* returns little-endian info.
164 if (cmd
== WIN_PIDENTIFY
) {
165 if ((id
->model
[0] == 'N' && id
->model
[1] == 'E') /* NEC */
166 || (id
->model
[0] == 'F' && id
->model
[1] == 'X') /* Mitsumi */
167 || (id
->model
[0] == 'P' && id
->model
[1] == 'i'))/* Pioneer */
168 /* Vertos drives may still be weird */
171 ide_fixstring(id
->model
, sizeof(id
->model
), bswap
);
172 ide_fixstring(id
->fw_rev
, sizeof(id
->fw_rev
), bswap
);
173 ide_fixstring(id
->serial_no
, sizeof(id
->serial_no
), bswap
);
175 if (strstr(id
->model
, "E X A B Y T E N E S T"))
178 /* we depend on this a lot! */
179 id
->model
[sizeof(id
->model
)-1] = '\0';
180 printk("%s: %s, ", drive
->name
, id
->model
);
185 * Check for an ATAPI device
187 if (cmd
== WIN_PIDENTIFY
) {
188 u8 type
= (id
->config
>> 8) & 0x1f;
192 if (!strstr(id
->model
, "CD-ROM")) {
193 if (!strstr(id
->model
, "oppy") &&
194 !strstr(id
->model
, "poyp") &&
195 !strstr(id
->model
, "ZIP"))
196 printk("cdrom or floppy?, assuming ");
197 if (drive
->media
!= ide_cdrom
) {
199 drive
->removable
= 1;
203 /* Early cdrom models used zero */
206 drive
->removable
= 1;
208 /* kludge for Apple PowerBook internal zip */
209 if (!strstr(id
->model
, "CD-ROM") &&
210 strstr(id
->model
, "ZIP")) {
216 printk ("CD/DVD-ROM");
223 drive
->removable
= 1;
226 printk("UNKNOWN (type %d)", type
);
231 /* an ATAPI device ignores DRDY */
232 drive
->ready_stat
= 0;
237 * Not an ATAPI device: looks like a "regular" hard disk
241 * 0x848a = CompactFlash device
242 * These are *not* removable in Linux definition of the term
245 if ((id
->config
!= 0x848a) && (id
->config
& (1<<7)))
246 drive
->removable
= 1;
248 drive
->media
= ide_disk
;
249 printk("%s DISK drive\n", (id
->config
== 0x848a) ? "CFA" : "ATA" );
260 * actual_try_to_identify - send ata/atapi identify
261 * @drive: drive to identify
262 * @cmd: command to use
264 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
265 * and waits for a response. It also monitors irqs while this is
266 * happening, in hope of automatically determining which one is
267 * being used by the interface.
269 * Returns: 0 device was identified
270 * 1 device timed-out (no response to identify request)
271 * 2 device aborted the command (refused to identify itself)
274 static int actual_try_to_identify (ide_drive_t
*drive
, u8 cmd
)
276 ide_hwif_t
*hwif
= HWIF(drive
);
278 unsigned long hd_status
;
279 unsigned long timeout
;
282 /* take a deep breath */
285 if (IDE_CONTROL_REG
) {
286 a
= hwif
->INB(IDE_ALTSTATUS_REG
);
287 s
= hwif
->INB(IDE_STATUS_REG
);
288 if ((a
^ s
) & ~INDEX_STAT
) {
289 printk(KERN_INFO
"%s: probing with STATUS(0x%02x) instead of "
290 "ALTSTATUS(0x%02x)\n", drive
->name
, s
, a
);
291 /* ancient Seagate drives, broken interfaces */
292 hd_status
= IDE_STATUS_REG
;
294 /* use non-intrusive polling */
295 hd_status
= IDE_ALTSTATUS_REG
;
298 hd_status
= IDE_STATUS_REG
;
300 /* set features register for atapi
301 * identify command to be sure of reply
303 if ((cmd
== WIN_PIDENTIFY
))
304 /* disable dma & overlap */
305 hwif
->OUTB(0, IDE_FEATURE_REG
);
307 /* ask drive for ID */
308 hwif
->OUTB(cmd
, IDE_COMMAND_REG
);
310 timeout
= ((cmd
== WIN_IDENTIFY
) ? WAIT_WORSTCASE
: WAIT_PIDENTIFY
) / 2;
313 if (time_after(jiffies
, timeout
)) {
314 /* drive timed-out */
317 /* give drive a breather */
319 } while ((hwif
->INB(hd_status
)) & BUSY_STAT
);
321 /* wait for IRQ and DRQ_STAT */
323 if (OK_STAT((hwif
->INB(IDE_STATUS_REG
)), DRQ_STAT
, BAD_R_STAT
)) {
326 /* local CPU only; some systems need this */
327 local_irq_save(flags
);
328 /* drive returned ID */
329 do_identify(drive
, cmd
);
330 /* drive responded with ID */
332 /* clear drive IRQ */
333 (void) hwif
->INB(IDE_STATUS_REG
);
334 local_irq_restore(flags
);
336 /* drive refused ID */
343 * try_to_identify - try to identify a drive
344 * @drive: drive to probe
345 * @cmd: command to use
347 * Issue the identify command and then do IRQ probing to
348 * complete the identification when needed by finding the
349 * IRQ the drive is attached to
352 static int try_to_identify (ide_drive_t
*drive
, u8 cmd
)
354 ide_hwif_t
*hwif
= HWIF(drive
);
357 unsigned long cookie
= 0;
360 * Disable device irq unless we need to
361 * probe for it. Otherwise we'll get spurious
362 * interrupts during the identify-phase that
363 * the irq handler isn't expecting.
365 if (IDE_CONTROL_REG
) {
366 u8 ctl
= drive
->ctl
| 2;
369 cookie
= probe_irq_on();
370 /* enable device irq */
373 hwif
->OUTB(ctl
, IDE_CONTROL_REG
);
376 retval
= actual_try_to_identify(drive
, cmd
);
380 /* mask device irq */
381 hwif
->OUTB(drive
->ctl
|2, IDE_CONTROL_REG
);
382 /* clear drive IRQ */
383 (void) hwif
->INB(IDE_STATUS_REG
);
385 irq
= probe_irq_off(cookie
);
390 /* Mmmm.. multiple IRQs..
391 * don't know which was ours
393 printk("%s: IRQ probe failed (0x%lx)\n",
394 drive
->name
, cookie
);
403 * do_probe - probe an IDE device
404 * @drive: drive to probe
405 * @cmd: command to use
407 * do_probe() has the difficult job of finding a drive if it exists,
408 * without getting hung up if it doesn't exist, without trampling on
409 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
411 * If a drive is "known" to exist (from CMOS or kernel parameters),
412 * but does not respond right away, the probe will "hang in there"
413 * for the maximum wait time (about 30 seconds), otherwise it will
414 * exit much more quickly.
416 * Returns: 0 device was identified
417 * 1 device timed-out (no response to identify request)
418 * 2 device aborted the command (refused to identify itself)
419 * 3 bad status from device (possible for ATAPI drives)
420 * 4 probe was not attempted because failure was obvious
423 static int do_probe (ide_drive_t
*drive
, u8 cmd
)
426 ide_hwif_t
*hwif
= HWIF(drive
);
428 if (drive
->present
) {
429 /* avoid waiting for inappropriate probes */
430 if ((drive
->media
!= ide_disk
) && (cmd
== WIN_IDENTIFY
))
434 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
435 drive
->name
, drive
->present
, drive
->media
,
436 (cmd
== WIN_IDENTIFY
) ? "ATA" : "ATAPI");
439 /* needed for some systems
440 * (e.g. crw9624 as drive0 with disk as slave)
445 if (hwif
->INB(IDE_SELECT_REG
) != drive
->select
.all
&& !drive
->present
) {
446 if (drive
->select
.b
.unit
!= 0) {
447 /* exit with drive0 selected */
448 SELECT_DRIVE(&hwif
->drives
[0]);
449 /* allow BUSY_STAT to assert & clear */
452 /* no i/f present: mmm.. this should be a 4 -ml */
456 if (OK_STAT((hwif
->INB(IDE_STATUS_REG
)), READY_STAT
, BUSY_STAT
) ||
457 drive
->present
|| cmd
== WIN_PIDENTIFY
) {
458 /* send cmd and wait */
459 if ((rc
= try_to_identify(drive
, cmd
))) {
460 /* failed: try again */
461 rc
= try_to_identify(drive
,cmd
);
463 if (hwif
->INB(IDE_STATUS_REG
) == (BUSY_STAT
|READY_STAT
))
466 if ((rc
== 1 && cmd
== WIN_PIDENTIFY
) &&
467 ((drive
->autotune
== IDE_TUNE_DEFAULT
) ||
468 (drive
->autotune
== IDE_TUNE_AUTO
))) {
469 unsigned long timeout
;
470 printk("%s: no response (status = 0x%02x), "
471 "resetting drive\n", drive
->name
,
472 hwif
->INB(IDE_STATUS_REG
));
474 hwif
->OUTB(drive
->select
.all
, IDE_SELECT_REG
);
476 hwif
->OUTB(WIN_SRST
, IDE_COMMAND_REG
);
478 while (((hwif
->INB(IDE_STATUS_REG
)) & BUSY_STAT
) &&
479 time_before(jiffies
, timeout
+ WAIT_WORSTCASE
))
481 rc
= try_to_identify(drive
, cmd
);
484 printk("%s: no response (status = 0x%02x)\n",
485 drive
->name
, hwif
->INB(IDE_STATUS_REG
));
486 /* ensure drive irq is clear */
487 (void) hwif
->INB(IDE_STATUS_REG
);
489 /* not present or maybe ATAPI */
492 if (drive
->select
.b
.unit
!= 0) {
493 /* exit with drive0 selected */
494 SELECT_DRIVE(&hwif
->drives
[0]);
496 /* ensure drive irq is clear */
497 (void) hwif
->INB(IDE_STATUS_REG
);
505 static void enable_nest (ide_drive_t
*drive
)
507 ide_hwif_t
*hwif
= HWIF(drive
);
508 unsigned long timeout
;
510 printk("%s: enabling %s -- ", hwif
->name
, drive
->id
->model
);
513 hwif
->OUTB(EXABYTE_ENABLE_NEST
, IDE_COMMAND_REG
);
514 timeout
= jiffies
+ WAIT_WORSTCASE
;
516 if (time_after(jiffies
, timeout
)) {
517 printk("failed (timeout)\n");
521 } while ((hwif
->INB(IDE_STATUS_REG
)) & BUSY_STAT
);
525 if (!OK_STAT((hwif
->INB(IDE_STATUS_REG
)), 0, BAD_STAT
)) {
526 printk("failed (status = 0x%02x)\n", hwif
->INB(IDE_STATUS_REG
));
531 /* if !(success||timed-out) */
532 if (do_probe(drive
, WIN_IDENTIFY
) >= 2) {
533 /* look for ATAPI device */
534 (void) do_probe(drive
, WIN_PIDENTIFY
);
539 * probe_for_drives - upper level drive probe
540 * @drive: drive to probe for
542 * probe_for_drive() tests for existence of a given drive using do_probe()
543 * and presents things to the user as needed.
545 * Returns: 0 no device was found
546 * 1 device was found (note: drive->present might
550 static inline u8
probe_for_drive (ide_drive_t
*drive
)
553 * In order to keep things simple we have an id
554 * block for all drives at all times. If the device
555 * is pre ATA or refuses ATA/ATAPI identify we
556 * will add faked data to this.
558 * Also note that 0 everywhere means "can't do X"
561 drive
->id
= kzalloc(SECTOR_WORDS
*4, GFP_KERNEL
);
563 if(drive
->id
== NULL
)
565 printk(KERN_ERR
"ide: out of memory for id data.\n");
568 strcpy(drive
->id
->model
, "UNKNOWN");
573 /* if !(success||timed-out) */
574 if (do_probe(drive
, WIN_IDENTIFY
) >= 2) {
575 /* look for ATAPI device */
576 (void) do_probe(drive
, WIN_PIDENTIFY
);
579 /* drive not found */
581 if (strstr(drive
->id
->model
, "E X A B Y T E N E S T"))
584 /* identification failed? */
585 if (!drive
->id_read
) {
586 if (drive
->media
== ide_disk
) {
587 printk(KERN_INFO
"%s: non-IDE drive, CHS=%d/%d/%d\n",
588 drive
->name
, drive
->cyl
,
589 drive
->head
, drive
->sect
);
590 } else if (drive
->media
== ide_cdrom
) {
591 printk(KERN_INFO
"%s: ATAPI cdrom (?)\n", drive
->name
);
594 printk(KERN_WARNING
"%s: Unknown device on bus refused identification. Ignoring.\n", drive
->name
);
598 /* drive was found */
602 /* The drive wasn't being helpful. Add generic info only */
603 if (drive
->id_read
== 0) {
608 if (drive
->media
== ide_disk
) {
609 ide_disk_init_chs(drive
);
610 ide_disk_init_mult_count(drive
);
613 return drive
->present
;
616 static void hwif_release_dev (struct device
*dev
)
618 ide_hwif_t
*hwif
= container_of(dev
, ide_hwif_t
, gendev
);
620 complete(&hwif
->gendev_rel_comp
);
623 static void hwif_register (ide_hwif_t
*hwif
)
627 /* register with global device tree */
628 strlcpy(hwif
->gendev
.bus_id
,hwif
->name
,BUS_ID_SIZE
);
629 hwif
->gendev
.driver_data
= hwif
;
630 if (hwif
->gendev
.parent
== NULL
) {
632 hwif
->gendev
.parent
= &hwif
->pci_dev
->dev
;
634 /* Would like to do = &device_legacy */
635 hwif
->gendev
.parent
= NULL
;
637 hwif
->gendev
.release
= hwif_release_dev
;
638 ret
= device_register(&hwif
->gendev
);
640 printk(KERN_WARNING
"IDE: %s: device_register error: %d\n",
644 static int wait_hwif_ready(ide_hwif_t
*hwif
)
648 printk(KERN_DEBUG
"Probing IDE interface %s...\n", hwif
->name
);
650 /* Let HW settle down a bit from whatever init state we
654 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
655 * I know of at least one disk who takes 31 seconds, I use 35
658 rc
= ide_wait_not_busy(hwif
, 35000);
662 /* Now make sure both master & slave are ready */
663 SELECT_DRIVE(&hwif
->drives
[0]);
664 hwif
->OUTB(8, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
666 rc
= ide_wait_not_busy(hwif
, 35000);
669 SELECT_DRIVE(&hwif
->drives
[1]);
670 hwif
->OUTB(8, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
672 rc
= ide_wait_not_busy(hwif
, 35000);
674 /* Exit function with master reselected (let's be sane) */
675 SELECT_DRIVE(&hwif
->drives
[0]);
681 * ide_undecoded_slave - look for bad CF adapters
684 * Analyse the drives on the interface and attempt to decide if we
685 * have the same drive viewed twice. This occurs with crap CF adapters
686 * and PCMCIA sometimes.
689 void ide_undecoded_slave(ide_hwif_t
*hwif
)
691 ide_drive_t
*drive0
= &hwif
->drives
[0];
692 ide_drive_t
*drive1
= &hwif
->drives
[1];
694 if (drive0
->present
== 0 || drive1
->present
== 0)
697 /* If the models don't match they are not the same product */
698 if (strcmp(drive0
->id
->model
, drive1
->id
->model
))
701 /* Serial numbers do not match */
702 if (strncmp(drive0
->id
->serial_no
, drive1
->id
->serial_no
, 20))
705 /* No serial number, thankfully very rare for CF */
706 if (drive0
->id
->serial_no
[0] == 0)
709 /* Appears to be an IDE flash adapter with decode bugs */
710 printk(KERN_WARNING
"ide-probe: ignoring undecoded slave\n");
715 EXPORT_SYMBOL_GPL(ide_undecoded_slave
);
718 * This routine only knows how to look for drive units 0 and 1
719 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
721 static void probe_hwif(ide_hwif_t
*hwif
)
730 if ((hwif
->chipset
!= ide_4drives
|| !hwif
->mate
|| !hwif
->mate
->present
) &&
731 (ide_hwif_request_regions(hwif
))) {
733 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
734 ide_drive_t
*drive
= &hwif
->drives
[unit
];
735 if (drive
->present
) {
737 printk(KERN_ERR
"%s: ERROR, PORTS ALREADY IN USE\n",
743 printk(KERN_ERR
"%s: ports already in use, skipping probe\n",
749 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
750 * we'll install our IRQ driver much later...
754 disable_irq(hwif
->irq
);
756 local_irq_set(flags
);
758 /* This is needed on some PPCs and a bunch of BIOS-less embedded
759 * platforms. Typical cases are:
761 * - The firmware hard reset the disk before booting the kernel,
762 * the drive is still doing it's poweron-reset sequence, that
763 * can take up to 30 seconds
764 * - The firmware does nothing (or no firmware), the device is
765 * still in POST state (same as above actually).
766 * - Some CD/DVD/Writer combo drives tend to drive the bus during
767 * their reset sequence even when they are non-selected slave
768 * devices, thus preventing discovery of the main HD
770 * Doing this wait-for-busy should not harm any existing configuration
771 * (at least things won't be worse than what current code does, that
772 * is blindly go & talk to the drive) and fix some issues like the
777 if (wait_hwif_ready(hwif
) == -EBUSY
)
778 printk(KERN_DEBUG
"%s: Wait for ready failed before probe !\n", hwif
->name
);
781 * Need to probe slave device first to make it release PDIAG-.
783 for (unit
= MAX_DRIVES
- 1; unit
>= 0; 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 (drive
->autotune
== IDE_TUNE_AUTO
)
831 ide_set_max_pio(drive
);
833 if (drive
->autotune
!= IDE_TUNE_DEFAULT
&&
834 drive
->autotune
!= IDE_TUNE_AUTO
)
839 if (hwif
->ide_dma_on
) {
841 * Force DMAing for the beginning of the check.
842 * Some chipsets appear to do interesting
843 * things, if not checked and cleared.
846 hwif
->dma_off_quietly(drive
);
852 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
853 ide_drive_t
*drive
= &hwif
->drives
[unit
];
855 if (hwif
->no_io_32bit
)
856 drive
->no_io_32bit
= 1;
858 drive
->no_io_32bit
= drive
->id
->dword_io
? 1 : 0;
862 static int hwif_init(ide_hwif_t
*hwif
);
863 static void hwif_register_devices(ide_hwif_t
*hwif
);
865 static int probe_hwif_init(ide_hwif_t
*hwif
)
869 if (!hwif_init(hwif
)) {
870 printk(KERN_INFO
"%s: failed to initialize IDE interface\n",
876 hwif_register_devices(hwif
);
883 * save_match() is used to simplify logic in init_irq() below.
885 * A loophole here is that we may not know about a particular
886 * hwif's irq until after that hwif is actually probed/initialized..
887 * This could be a problem for the case where an hwif is on a
888 * dual interface that requires serialization (eg. cmd640) and another
889 * hwif using one of the same irqs is initialized beforehand.
891 * This routine detects and reports such situations, but does not fix them.
893 static void save_match(ide_hwif_t
*hwif
, ide_hwif_t
*new, ide_hwif_t
**match
)
895 ide_hwif_t
*m
= *match
;
897 if (m
&& m
->hwgroup
&& m
->hwgroup
!= new->hwgroup
) {
900 printk("%s: potential irq problem with %s and %s\n",
901 hwif
->name
, new->name
, m
->name
);
903 if (!m
|| m
->irq
!= hwif
->irq
) /* don't undo a prior perfect match */
906 #endif /* MAX_HWIFS > 1 */
911 static int ide_init_queue(ide_drive_t
*drive
)
913 struct request_queue
*q
;
914 ide_hwif_t
*hwif
= HWIF(drive
);
915 int max_sectors
= 256;
916 int max_sg_entries
= PRD_ENTRIES
;
919 * Our default set up assumes the normal IDE case,
920 * that is 64K segmenting, standard PRD setup
921 * and LBA28. Some drivers then impose their own
922 * limits and LBA48 we could raise it but as yet
926 q
= blk_init_queue_node(do_ide_request
, &ide_lock
, hwif_to_node(hwif
));
930 q
->queuedata
= drive
;
931 blk_queue_segment_boundary(q
, 0xffff);
934 if ((hwif
->host_flags
& IDE_HFLAG_NO_LBA48
) ||
935 (hwif
->host_flags
& IDE_HFLAG_NO_LBA48_DMA
))
938 hwif
->rqsize
= 65536;
940 if (hwif
->rqsize
< max_sectors
)
941 max_sectors
= hwif
->rqsize
;
942 blk_queue_max_sectors(q
, max_sectors
);
945 /* When we have an IOMMU, we may have a problem where pci_map_sg()
946 * creates segments that don't completely match our boundary
947 * requirements and thus need to be broken up again. Because it
948 * doesn't align properly either, we may actually have to break up
949 * to more segments than what was we got in the first place, a max
950 * worst case is twice as many.
951 * This will be fixed once we teach pci_map_sg() about our boundary
952 * requirements, hopefully soon. *FIXME*
954 if (!PCI_DMA_BUS_IS_PHYS
)
955 max_sg_entries
>>= 1;
956 #endif /* CONFIG_PCI */
958 blk_queue_max_hw_segments(q
, max_sg_entries
);
959 blk_queue_max_phys_segments(q
, max_sg_entries
);
961 /* assign drive queue */
964 /* needs drive->queue to be set */
965 ide_toggle_bounce(drive
, 1);
971 * This routine sets up the irq for an ide interface, and creates a new
972 * hwgroup for the irq/hwif if none was previously assigned.
974 * Much of the code is for correctly detecting/handling irq sharing
975 * and irq serialization situations. This is somewhat complex because
976 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
978 * The IRQF_DISABLED in sa_flags means ide_intr() is always entered with
979 * interrupts completely disabled. This can be bad for interrupt latency,
980 * but anything else has led to problems on some machines. We re-enable
981 * interrupts as much as we can safely do in most places.
983 static int init_irq (ide_hwif_t
*hwif
)
986 ide_hwgroup_t
*hwgroup
;
987 ide_hwif_t
*match
= NULL
;
990 BUG_ON(in_interrupt());
991 BUG_ON(irqs_disabled());
992 BUG_ON(hwif
== NULL
);
994 mutex_lock(&ide_cfg_mtx
);
995 hwif
->hwgroup
= NULL
;
998 * Group up with any other hwifs that share our irq(s).
1000 for (index
= 0; index
< MAX_HWIFS
; index
++) {
1001 ide_hwif_t
*h
= &ide_hwifs
[index
];
1002 if (h
->hwgroup
) { /* scan only initialized hwif's */
1003 if (hwif
->irq
== h
->irq
) {
1004 hwif
->sharing_irq
= h
->sharing_irq
= 1;
1005 if (hwif
->chipset
!= ide_pci
||
1006 h
->chipset
!= ide_pci
) {
1007 save_match(hwif
, h
, &match
);
1010 if (hwif
->serialized
) {
1011 if (hwif
->mate
&& hwif
->mate
->irq
== h
->irq
)
1012 save_match(hwif
, h
, &match
);
1014 if (h
->serialized
) {
1015 if (h
->mate
&& hwif
->irq
== h
->mate
->irq
)
1016 save_match(hwif
, h
, &match
);
1020 #endif /* MAX_HWIFS > 1 */
1022 * If we are still without a hwgroup, then form a new one
1025 hwgroup
= match
->hwgroup
;
1026 hwif
->hwgroup
= hwgroup
;
1028 * Link us into the hwgroup.
1029 * This must be done early, do ensure that unexpected_intr
1030 * can find the hwif and prevent irq storms.
1031 * No drives are attached to the new hwif, choose_drive
1032 * can't do anything stupid (yet).
1033 * Add ourself as the 2nd entry to the hwgroup->hwif
1034 * linked list, the first entry is the hwif that owns
1035 * hwgroup->handler - do not change that.
1037 spin_lock_irq(&ide_lock
);
1038 hwif
->next
= hwgroup
->hwif
->next
;
1039 hwgroup
->hwif
->next
= hwif
;
1040 spin_unlock_irq(&ide_lock
);
1042 hwgroup
= kmalloc_node(sizeof(ide_hwgroup_t
),
1043 GFP_KERNEL
| __GFP_ZERO
,
1044 hwif_to_node(hwif
->drives
[0].hwif
));
1048 hwif
->hwgroup
= hwgroup
;
1050 hwgroup
->hwif
= hwif
->next
= hwif
;
1052 hwgroup
->handler
= NULL
;
1053 hwgroup
->drive
= NULL
;
1055 init_timer(&hwgroup
->timer
);
1056 hwgroup
->timer
.function
= &ide_timer_expiry
;
1057 hwgroup
->timer
.data
= (unsigned long) hwgroup
;
1061 * Allocate the irq, if not already obtained for another hwif
1063 if (!match
|| match
->irq
!= hwif
->irq
) {
1064 int sa
= IRQF_DISABLED
;
1065 #if defined(__mc68000__) || defined(CONFIG_APUS)
1067 #endif /* __mc68000__ || CONFIG_APUS */
1069 if (IDE_CHIPSET_IS_PCI(hwif
->chipset
)) {
1071 #ifndef CONFIG_IDEPCI_SHARE_IRQ
1072 sa
|= IRQF_DISABLED
;
1073 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
1076 if (hwif
->io_ports
[IDE_CONTROL_OFFSET
])
1078 hwif
->OUTB(0x08, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
1080 if (request_irq(hwif
->irq
,&ide_intr
,sa
,hwif
->name
,hwgroup
))
1085 * For any present drive:
1086 * - allocate the block device queue
1087 * - link drive into the hwgroup
1089 for (index
= 0; index
< MAX_DRIVES
; ++index
) {
1090 ide_drive_t
*drive
= &hwif
->drives
[index
];
1091 if (!drive
->present
)
1093 if (ide_init_queue(drive
)) {
1094 printk(KERN_ERR
"ide: failed to init %s\n",drive
->name
);
1097 spin_lock_irq(&ide_lock
);
1098 if (!hwgroup
->drive
) {
1099 /* first drive for hwgroup. */
1100 drive
->next
= drive
;
1101 hwgroup
->drive
= drive
;
1102 hwgroup
->hwif
= HWIF(hwgroup
->drive
);
1104 drive
->next
= hwgroup
->drive
->next
;
1105 hwgroup
->drive
->next
= drive
;
1107 spin_unlock_irq(&ide_lock
);
1110 #if !defined(__mc68000__) && !defined(CONFIG_APUS)
1111 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif
->name
,
1112 hwif
->io_ports
[IDE_DATA_OFFSET
],
1113 hwif
->io_ports
[IDE_DATA_OFFSET
]+7,
1114 hwif
->io_ports
[IDE_CONTROL_OFFSET
], hwif
->irq
);
1116 printk("%s at 0x%08lx on irq %d", hwif
->name
,
1117 hwif
->io_ports
[IDE_DATA_OFFSET
], hwif
->irq
);
1118 #endif /* __mc68000__ && CONFIG_APUS */
1120 printk(" (%sed with %s)",
1121 hwif
->sharing_irq
? "shar" : "serializ", match
->name
);
1123 mutex_unlock(&ide_cfg_mtx
);
1126 spin_lock_irq(&ide_lock
);
1127 if (hwif
->next
== hwif
) {
1129 BUG_ON(hwgroup
->hwif
!= hwif
);
1134 while (g
->next
!= hwif
)
1136 g
->next
= hwif
->next
;
1137 if (hwgroup
->hwif
== hwif
) {
1139 printk(KERN_ERR
"Duh. Uninitialized hwif listed as active hwif.\n");
1142 BUG_ON(hwgroup
->hwif
== hwif
);
1144 spin_unlock_irq(&ide_lock
);
1146 mutex_unlock(&ide_cfg_mtx
);
1150 static int ata_lock(dev_t dev
, void *data
)
1152 /* FIXME: we want to pin hwif down */
1156 static struct kobject
*ata_probe(dev_t dev
, int *part
, void *data
)
1158 ide_hwif_t
*hwif
= data
;
1159 int unit
= *part
>> PARTN_BITS
;
1160 ide_drive_t
*drive
= &hwif
->drives
[unit
];
1161 if (!drive
->present
)
1164 if (drive
->media
== ide_disk
)
1165 request_module("ide-disk");
1167 request_module("ide-scsi");
1168 if (drive
->media
== ide_cdrom
|| drive
->media
== ide_optical
)
1169 request_module("ide-cd");
1170 if (drive
->media
== ide_tape
)
1171 request_module("ide-tape");
1172 if (drive
->media
== ide_floppy
)
1173 request_module("ide-floppy");
1178 static struct kobject
*exact_match(dev_t dev
, int *part
, void *data
)
1180 struct gendisk
*p
= data
;
1181 *part
&= (1 << PARTN_BITS
) - 1;
1185 static int exact_lock(dev_t dev
, void *data
)
1187 struct gendisk
*p
= data
;
1194 void ide_register_region(struct gendisk
*disk
)
1196 blk_register_region(MKDEV(disk
->major
, disk
->first_minor
),
1197 disk
->minors
, NULL
, exact_match
, exact_lock
, disk
);
1200 EXPORT_SYMBOL_GPL(ide_register_region
);
1202 void ide_unregister_region(struct gendisk
*disk
)
1204 blk_unregister_region(MKDEV(disk
->major
, disk
->first_minor
),
1208 EXPORT_SYMBOL_GPL(ide_unregister_region
);
1210 void ide_init_disk(struct gendisk
*disk
, ide_drive_t
*drive
)
1212 ide_hwif_t
*hwif
= drive
->hwif
;
1213 unsigned int unit
= (drive
->select
.all
>> 4) & 1;
1215 disk
->major
= hwif
->major
;
1216 disk
->first_minor
= unit
<< PARTN_BITS
;
1217 sprintf(disk
->disk_name
, "hd%c", 'a' + hwif
->index
* MAX_DRIVES
+ unit
);
1218 disk
->queue
= drive
->queue
;
1221 EXPORT_SYMBOL_GPL(ide_init_disk
);
1223 static void ide_remove_drive_from_hwgroup(ide_drive_t
*drive
)
1225 ide_hwgroup_t
*hwgroup
= drive
->hwif
->hwgroup
;
1227 if (drive
== drive
->next
) {
1228 /* special case: last drive from hwgroup. */
1229 BUG_ON(hwgroup
->drive
!= drive
);
1230 hwgroup
->drive
= NULL
;
1234 walk
= hwgroup
->drive
;
1235 while (walk
->next
!= drive
)
1237 walk
->next
= drive
->next
;
1238 if (hwgroup
->drive
== drive
) {
1239 hwgroup
->drive
= drive
->next
;
1240 hwgroup
->hwif
= hwgroup
->drive
->hwif
;
1243 BUG_ON(hwgroup
->drive
== drive
);
1246 static void drive_release_dev (struct device
*dev
)
1248 ide_drive_t
*drive
= container_of(dev
, ide_drive_t
, gendev
);
1250 spin_lock_irq(&ide_lock
);
1251 ide_remove_drive_from_hwgroup(drive
);
1255 /* Messed up locking ... */
1256 spin_unlock_irq(&ide_lock
);
1257 blk_cleanup_queue(drive
->queue
);
1258 spin_lock_irq(&ide_lock
);
1259 drive
->queue
= NULL
;
1260 spin_unlock_irq(&ide_lock
);
1262 complete(&drive
->gendev_rel_comp
);
1266 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1267 * after probing for drives, to allocate partition tables and other data
1268 * structures needed for the routines in genhd.c. ide_geninit() gets called
1269 * somewhat later, during the partition check.
1271 static void init_gendisk (ide_hwif_t
*hwif
)
1275 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
1276 ide_drive_t
* drive
= &hwif
->drives
[unit
];
1277 ide_add_generic_settings(drive
);
1278 snprintf(drive
->gendev
.bus_id
,BUS_ID_SIZE
,"%u.%u",
1280 drive
->gendev
.parent
= &hwif
->gendev
;
1281 drive
->gendev
.bus
= &ide_bus_type
;
1282 drive
->gendev
.driver_data
= drive
;
1283 drive
->gendev
.release
= drive_release_dev
;
1285 blk_register_region(MKDEV(hwif
->major
, 0), MAX_DRIVES
<< PARTN_BITS
,
1286 THIS_MODULE
, ata_probe
, ata_lock
, hwif
);
1289 static int hwif_init(ide_hwif_t
*hwif
)
1293 /* Return success if no device is connected */
1298 if (!(hwif
->irq
= ide_default_irq(hwif
->io_ports
[IDE_DATA_OFFSET
])))
1300 printk("%s: DISABLED, NO IRQ\n", hwif
->name
);
1301 return (hwif
->present
= 0);
1304 #ifdef CONFIG_BLK_DEV_HD
1305 if (hwif
->irq
== HD_IRQ
&& hwif
->io_ports
[IDE_DATA_OFFSET
] != HD_DATA
) {
1306 printk("%s: CANNOT SHARE IRQ WITH OLD "
1307 "HARDDISK DRIVER (hd.c)\n", hwif
->name
);
1308 return (hwif
->present
= 0);
1310 #endif /* CONFIG_BLK_DEV_HD */
1312 /* we set it back to 1 if all is ok below */
1315 if (register_blkdev(hwif
->major
, hwif
->name
))
1318 if (!hwif
->sg_max_nents
)
1319 hwif
->sg_max_nents
= PRD_ENTRIES
;
1321 hwif
->sg_table
= kmalloc(sizeof(struct scatterlist
)*hwif
->sg_max_nents
,
1323 if (!hwif
->sg_table
) {
1324 printk(KERN_ERR
"%s: unable to allocate SG table.\n", hwif
->name
);
1328 sg_init_table(hwif
->sg_table
, hwif
->sg_max_nents
);
1330 if (init_irq(hwif
) == 0)
1333 old_irq
= hwif
->irq
;
1335 * It failed to initialise. Find the default IRQ for
1336 * this port and try that.
1338 if (!(hwif
->irq
= ide_default_irq(hwif
->io_ports
[IDE_DATA_OFFSET
]))) {
1339 printk("%s: Disabled unable to get IRQ %d.\n",
1340 hwif
->name
, old_irq
);
1343 if (init_irq(hwif
)) {
1344 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1345 hwif
->name
, old_irq
, hwif
->irq
);
1348 printk("%s: probed IRQ %d failed, using default.\n",
1349 hwif
->name
, hwif
->irq
);
1354 ide_acpi_init(hwif
);
1356 hwif
->present
= 1; /* success */
1360 unregister_blkdev(hwif
->major
, hwif
->name
);
1364 static void hwif_register_devices(ide_hwif_t
*hwif
)
1368 for (i
= 0; i
< MAX_DRIVES
; i
++) {
1369 ide_drive_t
*drive
= &hwif
->drives
[i
];
1371 if (drive
->present
) {
1372 int ret
= device_register(&drive
->gendev
);
1375 printk(KERN_WARNING
"IDE: %s: "
1376 "device_register error: %d\n",
1382 int ideprobe_init (void)
1385 int probe
[MAX_HWIFS
];
1387 memset(probe
, 0, MAX_HWIFS
* sizeof(int));
1388 for (index
= 0; index
< MAX_HWIFS
; ++index
)
1389 probe
[index
] = !ide_hwifs
[index
].present
;
1391 for (index
= 0; index
< MAX_HWIFS
; ++index
)
1393 probe_hwif(&ide_hwifs
[index
]);
1394 for (index
= 0; index
< MAX_HWIFS
; ++index
)
1396 hwif_init(&ide_hwifs
[index
]);
1397 for (index
= 0; index
< MAX_HWIFS
; ++index
) {
1399 ide_hwif_t
*hwif
= &ide_hwifs
[index
];
1402 if (hwif
->chipset
== ide_unknown
|| hwif
->chipset
== ide_forced
)
1403 hwif
->chipset
= ide_generic
;
1404 hwif_register_devices(hwif
);
1407 for (index
= 0; index
< MAX_HWIFS
; ++index
)
1409 ide_proc_register_port(&ide_hwifs
[index
]);
1413 EXPORT_SYMBOL_GPL(ideprobe_init
);
1415 int ide_device_add(u8 idx
[4])
1419 for (i
= 0; i
< 4; i
++) {
1421 rc
|= probe_hwif_init(&ide_hwifs
[idx
[i
]]);
1424 for (i
= 0; i
< 4; i
++) {
1426 ide_proc_register_port(&ide_hwifs
[idx
[i
]]);
1432 EXPORT_SYMBOL_GPL(ide_device_add
);
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