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 * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/string.h>
23 #include <linux/kernel.h>
24 #include <linux/timer.h>
26 #include <linux/interrupt.h>
27 #include <linux/major.h>
28 #include <linux/errno.h>
29 #include <linux/genhd.h>
30 #include <linux/slab.h>
31 #include <linux/delay.h>
32 #include <linux/ide.h>
33 #include <linux/spinlock.h>
34 #include <linux/kmod.h>
35 #include <linux/pci.h>
36 #include <linux/scatterlist.h>
38 #include <asm/byteorder.h>
40 #include <asm/uaccess.h>
44 * generic_id - add a generic drive id
45 * @drive: drive to make an ID block for
47 * Add a fake id field to the drive we are passed. This allows
48 * use to skip a ton of NULL checks (which people always miss)
49 * and make drive properties unconditional outside of this file
52 static void generic_id(ide_drive_t
*drive
)
54 drive
->id
->cyls
= drive
->cyl
;
55 drive
->id
->heads
= drive
->head
;
56 drive
->id
->sectors
= drive
->sect
;
57 drive
->id
->cur_cyls
= drive
->cyl
;
58 drive
->id
->cur_heads
= drive
->head
;
59 drive
->id
->cur_sectors
= drive
->sect
;
62 static void ide_disk_init_chs(ide_drive_t
*drive
)
64 struct hd_driveid
*id
= drive
->id
;
66 /* Extract geometry if we did not already have one for the drive */
67 if (!drive
->cyl
|| !drive
->head
|| !drive
->sect
) {
68 drive
->cyl
= drive
->bios_cyl
= id
->cyls
;
69 drive
->head
= drive
->bios_head
= id
->heads
;
70 drive
->sect
= drive
->bios_sect
= id
->sectors
;
73 /* Handle logical geometry translation by the drive */
74 if ((id
->field_valid
& 1) && id
->cur_cyls
&&
75 id
->cur_heads
&& (id
->cur_heads
<= 16) && id
->cur_sectors
) {
76 drive
->cyl
= id
->cur_cyls
;
77 drive
->head
= id
->cur_heads
;
78 drive
->sect
= id
->cur_sectors
;
81 /* Use physical geometry if what we have still makes no sense */
82 if (drive
->head
> 16 && id
->heads
&& id
->heads
<= 16) {
83 drive
->cyl
= id
->cyls
;
84 drive
->head
= id
->heads
;
85 drive
->sect
= id
->sectors
;
89 static void ide_disk_init_mult_count(ide_drive_t
*drive
)
91 struct hd_driveid
*id
= drive
->id
;
93 drive
->mult_count
= 0;
94 if (id
->max_multsect
) {
95 #ifdef CONFIG_IDEDISK_MULTI_MODE
96 id
->multsect
= ((id
->max_multsect
/2) > 1) ? id
->max_multsect
: 0;
97 id
->multsect_valid
= id
->multsect
? 1 : 0;
98 drive
->mult_req
= id
->multsect_valid
? id
->max_multsect
: 0;
99 drive
->special
.b
.set_multmode
= drive
->mult_req
? 1 : 0;
100 #else /* original, pre IDE-NFG, per request of AC */
102 if (drive
->mult_req
> id
->max_multsect
)
103 drive
->mult_req
= id
->max_multsect
;
104 if (drive
->mult_req
|| ((id
->multsect_valid
& 1) && id
->multsect
))
105 drive
->special
.b
.set_multmode
= 1;
111 * do_identify - identify a drive
112 * @drive: drive to identify
115 * Called when we have issued a drive identify command to
116 * read and parse the results. This function is run with
117 * interrupts disabled.
120 static inline void do_identify (ide_drive_t
*drive
, u8 cmd
)
122 ide_hwif_t
*hwif
= HWIF(drive
);
124 struct hd_driveid
*id
;
127 /* read 512 bytes of id info */
128 hwif
->ata_input_data(drive
, id
, SECTOR_WORDS
);
134 #if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
136 * EATA SCSI controllers do a hardware ATA emulation:
137 * Ignore them if there is a driver for them available.
139 if ((id
->model
[0] == 'P' && id
->model
[1] == 'M') ||
140 (id
->model
[0] == 'S' && id
->model
[1] == 'K')) {
141 printk("%s: EATA SCSI HBA %.10s\n", drive
->name
, id
->model
);
144 #endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
147 * WIN_IDENTIFY returns little-endian info,
148 * WIN_PIDENTIFY *usually* returns little-endian info.
150 if (cmd
== WIN_PIDENTIFY
) {
151 if ((id
->model
[0] == 'N' && id
->model
[1] == 'E') /* NEC */
152 || (id
->model
[0] == 'F' && id
->model
[1] == 'X') /* Mitsumi */
153 || (id
->model
[0] == 'P' && id
->model
[1] == 'i'))/* Pioneer */
154 /* Vertos drives may still be weird */
157 ide_fixstring(id
->model
, sizeof(id
->model
), bswap
);
158 ide_fixstring(id
->fw_rev
, sizeof(id
->fw_rev
), bswap
);
159 ide_fixstring(id
->serial_no
, sizeof(id
->serial_no
), bswap
);
161 /* we depend on this a lot! */
162 id
->model
[sizeof(id
->model
)-1] = '\0';
164 if (strstr(id
->model
, "E X A B Y T E N E S T"))
167 printk("%s: %s, ", drive
->name
, id
->model
);
172 * Check for an ATAPI device
174 if (cmd
== WIN_PIDENTIFY
) {
175 u8 type
= (id
->config
>> 8) & 0x1f;
179 if (!strstr(id
->model
, "CD-ROM")) {
180 if (!strstr(id
->model
, "oppy") &&
181 !strstr(id
->model
, "poyp") &&
182 !strstr(id
->model
, "ZIP"))
183 printk("cdrom or floppy?, assuming ");
184 if (drive
->media
!= ide_cdrom
) {
186 drive
->removable
= 1;
190 /* Early cdrom models used zero */
193 drive
->removable
= 1;
195 /* kludge for Apple PowerBook internal zip */
196 if (!strstr(id
->model
, "CD-ROM") &&
197 strstr(id
->model
, "ZIP")) {
203 printk ("CD/DVD-ROM");
210 drive
->removable
= 1;
213 printk("UNKNOWN (type %d)", type
);
218 /* an ATAPI device ignores DRDY */
219 drive
->ready_stat
= 0;
224 * Not an ATAPI device: looks like a "regular" hard disk
228 * 0x848a = CompactFlash device
229 * These are *not* removable in Linux definition of the term
232 if ((id
->config
!= 0x848a) && (id
->config
& (1<<7)))
233 drive
->removable
= 1;
235 drive
->media
= ide_disk
;
236 printk("%s DISK drive\n", (id
->config
== 0x848a) ? "CFA" : "ATA" );
239 drive
->quirk_list
= hwif
->quirkproc(drive
);
250 * actual_try_to_identify - send ata/atapi identify
251 * @drive: drive to identify
252 * @cmd: command to use
254 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
255 * and waits for a response. It also monitors irqs while this is
256 * happening, in hope of automatically determining which one is
257 * being used by the interface.
259 * Returns: 0 device was identified
260 * 1 device timed-out (no response to identify request)
261 * 2 device aborted the command (refused to identify itself)
264 static int actual_try_to_identify (ide_drive_t
*drive
, u8 cmd
)
266 ide_hwif_t
*hwif
= HWIF(drive
);
268 unsigned long hd_status
;
269 unsigned long timeout
;
272 /* take a deep breath */
275 if (IDE_CONTROL_REG
) {
276 a
= hwif
->INB(IDE_ALTSTATUS_REG
);
277 s
= hwif
->INB(IDE_STATUS_REG
);
278 if ((a
^ s
) & ~INDEX_STAT
) {
279 printk(KERN_INFO
"%s: probing with STATUS(0x%02x) instead of "
280 "ALTSTATUS(0x%02x)\n", drive
->name
, s
, a
);
281 /* ancient Seagate drives, broken interfaces */
282 hd_status
= IDE_STATUS_REG
;
284 /* use non-intrusive polling */
285 hd_status
= IDE_ALTSTATUS_REG
;
288 hd_status
= IDE_STATUS_REG
;
290 /* set features register for atapi
291 * identify command to be sure of reply
293 if ((cmd
== WIN_PIDENTIFY
))
294 /* disable dma & overlap */
295 hwif
->OUTB(0, IDE_FEATURE_REG
);
297 /* ask drive for ID */
298 hwif
->OUTB(cmd
, IDE_COMMAND_REG
);
300 timeout
= ((cmd
== WIN_IDENTIFY
) ? WAIT_WORSTCASE
: WAIT_PIDENTIFY
) / 2;
303 if (time_after(jiffies
, timeout
)) {
304 /* drive timed-out */
307 /* give drive a breather */
309 } while ((hwif
->INB(hd_status
)) & BUSY_STAT
);
311 /* wait for IRQ and DRQ_STAT */
313 if (OK_STAT((hwif
->INB(IDE_STATUS_REG
)), DRQ_STAT
, BAD_R_STAT
)) {
316 /* local CPU only; some systems need this */
317 local_irq_save(flags
);
318 /* drive returned ID */
319 do_identify(drive
, cmd
);
320 /* drive responded with ID */
322 /* clear drive IRQ */
323 (void) hwif
->INB(IDE_STATUS_REG
);
324 local_irq_restore(flags
);
326 /* drive refused ID */
333 * try_to_identify - try to identify a drive
334 * @drive: drive to probe
335 * @cmd: command to use
337 * Issue the identify command and then do IRQ probing to
338 * complete the identification when needed by finding the
339 * IRQ the drive is attached to
342 static int try_to_identify (ide_drive_t
*drive
, u8 cmd
)
344 ide_hwif_t
*hwif
= HWIF(drive
);
347 unsigned long cookie
= 0;
350 * Disable device irq unless we need to
351 * probe for it. Otherwise we'll get spurious
352 * interrupts during the identify-phase that
353 * the irq handler isn't expecting.
355 if (IDE_CONTROL_REG
) {
356 u8 ctl
= drive
->ctl
| 2;
359 cookie
= probe_irq_on();
360 /* enable device irq */
363 hwif
->OUTB(ctl
, IDE_CONTROL_REG
);
366 retval
= actual_try_to_identify(drive
, cmd
);
370 /* mask device irq */
371 hwif
->OUTB(drive
->ctl
|2, IDE_CONTROL_REG
);
372 /* clear drive IRQ */
373 (void) hwif
->INB(IDE_STATUS_REG
);
375 irq
= probe_irq_off(cookie
);
380 /* Mmmm.. multiple IRQs..
381 * don't know which was ours
383 printk("%s: IRQ probe failed (0x%lx)\n",
384 drive
->name
, cookie
);
393 * do_probe - probe an IDE device
394 * @drive: drive to probe
395 * @cmd: command to use
397 * do_probe() has the difficult job of finding a drive if it exists,
398 * without getting hung up if it doesn't exist, without trampling on
399 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
401 * If a drive is "known" to exist (from CMOS or kernel parameters),
402 * but does not respond right away, the probe will "hang in there"
403 * for the maximum wait time (about 30 seconds), otherwise it will
404 * exit much more quickly.
406 * Returns: 0 device was identified
407 * 1 device timed-out (no response to identify request)
408 * 2 device aborted the command (refused to identify itself)
409 * 3 bad status from device (possible for ATAPI drives)
410 * 4 probe was not attempted because failure was obvious
413 static int do_probe (ide_drive_t
*drive
, u8 cmd
)
416 ide_hwif_t
*hwif
= HWIF(drive
);
418 if (drive
->present
) {
419 /* avoid waiting for inappropriate probes */
420 if ((drive
->media
!= ide_disk
) && (cmd
== WIN_IDENTIFY
))
424 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
425 drive
->name
, drive
->present
, drive
->media
,
426 (cmd
== WIN_IDENTIFY
) ? "ATA" : "ATAPI");
429 /* needed for some systems
430 * (e.g. crw9624 as drive0 with disk as slave)
435 if (hwif
->INB(IDE_SELECT_REG
) != drive
->select
.all
&& !drive
->present
) {
436 if (drive
->select
.b
.unit
!= 0) {
437 /* exit with drive0 selected */
438 SELECT_DRIVE(&hwif
->drives
[0]);
439 /* allow BUSY_STAT to assert & clear */
442 /* no i/f present: mmm.. this should be a 4 -ml */
446 if (OK_STAT((hwif
->INB(IDE_STATUS_REG
)), READY_STAT
, BUSY_STAT
) ||
447 drive
->present
|| cmd
== WIN_PIDENTIFY
) {
448 /* send cmd and wait */
449 if ((rc
= try_to_identify(drive
, cmd
))) {
450 /* failed: try again */
451 rc
= try_to_identify(drive
,cmd
);
453 if (hwif
->INB(IDE_STATUS_REG
) == (BUSY_STAT
|READY_STAT
))
456 if ((rc
== 1 && cmd
== WIN_PIDENTIFY
) &&
457 ((drive
->autotune
== IDE_TUNE_DEFAULT
) ||
458 (drive
->autotune
== IDE_TUNE_AUTO
))) {
459 unsigned long timeout
;
460 printk("%s: no response (status = 0x%02x), "
461 "resetting drive\n", drive
->name
,
462 hwif
->INB(IDE_STATUS_REG
));
464 hwif
->OUTB(drive
->select
.all
, IDE_SELECT_REG
);
466 hwif
->OUTB(WIN_SRST
, IDE_COMMAND_REG
);
468 while (((hwif
->INB(IDE_STATUS_REG
)) & BUSY_STAT
) &&
469 time_before(jiffies
, timeout
+ WAIT_WORSTCASE
))
471 rc
= try_to_identify(drive
, cmd
);
474 printk("%s: no response (status = 0x%02x)\n",
475 drive
->name
, hwif
->INB(IDE_STATUS_REG
));
476 /* ensure drive irq is clear */
477 (void) hwif
->INB(IDE_STATUS_REG
);
479 /* not present or maybe ATAPI */
482 if (drive
->select
.b
.unit
!= 0) {
483 /* exit with drive0 selected */
484 SELECT_DRIVE(&hwif
->drives
[0]);
486 /* ensure drive irq is clear */
487 (void) hwif
->INB(IDE_STATUS_REG
);
495 static void enable_nest (ide_drive_t
*drive
)
497 ide_hwif_t
*hwif
= HWIF(drive
);
498 unsigned long timeout
;
500 printk("%s: enabling %s -- ", hwif
->name
, drive
->id
->model
);
503 hwif
->OUTB(EXABYTE_ENABLE_NEST
, IDE_COMMAND_REG
);
504 timeout
= jiffies
+ WAIT_WORSTCASE
;
506 if (time_after(jiffies
, timeout
)) {
507 printk("failed (timeout)\n");
511 } while ((hwif
->INB(IDE_STATUS_REG
)) & BUSY_STAT
);
515 if (!OK_STAT((hwif
->INB(IDE_STATUS_REG
)), 0, BAD_STAT
)) {
516 printk("failed (status = 0x%02x)\n", hwif
->INB(IDE_STATUS_REG
));
521 /* if !(success||timed-out) */
522 if (do_probe(drive
, WIN_IDENTIFY
) >= 2) {
523 /* look for ATAPI device */
524 (void) do_probe(drive
, WIN_PIDENTIFY
);
529 * probe_for_drives - upper level drive probe
530 * @drive: drive to probe for
532 * probe_for_drive() tests for existence of a given drive using do_probe()
533 * and presents things to the user as needed.
535 * Returns: 0 no device was found
536 * 1 device was found (note: drive->present might
540 static inline u8
probe_for_drive (ide_drive_t
*drive
)
543 * In order to keep things simple we have an id
544 * block for all drives at all times. If the device
545 * is pre ATA or refuses ATA/ATAPI identify we
546 * will add faked data to this.
548 * Also note that 0 everywhere means "can't do X"
551 drive
->id
= kzalloc(SECTOR_WORDS
*4, GFP_KERNEL
);
553 if(drive
->id
== NULL
)
555 printk(KERN_ERR
"ide: out of memory for id data.\n");
558 strcpy(drive
->id
->model
, "UNKNOWN");
563 /* if !(success||timed-out) */
564 if (do_probe(drive
, WIN_IDENTIFY
) >= 2) {
565 /* look for ATAPI device */
566 (void) do_probe(drive
, WIN_PIDENTIFY
);
569 /* drive not found */
571 if (strstr(drive
->id
->model
, "E X A B Y T E N E S T"))
574 /* identification failed? */
575 if (!drive
->id_read
) {
576 if (drive
->media
== ide_disk
) {
577 printk(KERN_INFO
"%s: non-IDE drive, CHS=%d/%d/%d\n",
578 drive
->name
, drive
->cyl
,
579 drive
->head
, drive
->sect
);
580 } else if (drive
->media
== ide_cdrom
) {
581 printk(KERN_INFO
"%s: ATAPI cdrom (?)\n", drive
->name
);
584 printk(KERN_WARNING
"%s: Unknown device on bus refused identification. Ignoring.\n", drive
->name
);
588 /* drive was found */
592 /* The drive wasn't being helpful. Add generic info only */
593 if (drive
->id_read
== 0) {
598 if (drive
->media
== ide_disk
) {
599 ide_disk_init_chs(drive
);
600 ide_disk_init_mult_count(drive
);
603 return drive
->present
;
606 static void hwif_release_dev (struct device
*dev
)
608 ide_hwif_t
*hwif
= container_of(dev
, ide_hwif_t
, gendev
);
610 complete(&hwif
->gendev_rel_comp
);
613 static void hwif_register (ide_hwif_t
*hwif
)
617 /* register with global device tree */
618 strlcpy(hwif
->gendev
.bus_id
,hwif
->name
,BUS_ID_SIZE
);
619 hwif
->gendev
.driver_data
= hwif
;
620 if (hwif
->gendev
.parent
== NULL
) {
622 hwif
->gendev
.parent
= &hwif
->pci_dev
->dev
;
624 /* Would like to do = &device_legacy */
625 hwif
->gendev
.parent
= NULL
;
627 hwif
->gendev
.release
= hwif_release_dev
;
628 ret
= device_register(&hwif
->gendev
);
630 printk(KERN_WARNING
"IDE: %s: device_register error: %d\n",
634 static int wait_hwif_ready(ide_hwif_t
*hwif
)
638 printk(KERN_DEBUG
"Probing IDE interface %s...\n", hwif
->name
);
640 /* Let HW settle down a bit from whatever init state we
644 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
645 * I know of at least one disk who takes 31 seconds, I use 35
648 rc
= ide_wait_not_busy(hwif
, 35000);
652 /* Now make sure both master & slave are ready */
653 for (unit
= 0; unit
< MAX_DRIVES
; unit
++) {
654 ide_drive_t
*drive
= &hwif
->drives
[unit
];
656 /* Ignore disks that we will not probe for later. */
657 if (!drive
->noprobe
|| drive
->present
) {
660 hwif
->OUTB(drive
->ctl
, IDE_CONTROL_REG
);
662 rc
= ide_wait_not_busy(hwif
, 35000);
666 printk(KERN_DEBUG
"%s: ide_wait_not_busy() skipped\n",
670 /* Exit function with master reselected (let's be sane) */
672 SELECT_DRIVE(&hwif
->drives
[0]);
678 * ide_undecoded_slave - look for bad CF adapters
681 * Analyse the drives on the interface and attempt to decide if we
682 * have the same drive viewed twice. This occurs with crap CF adapters
683 * and PCMCIA sometimes.
686 void ide_undecoded_slave(ide_hwif_t
*hwif
)
688 ide_drive_t
*drive0
= &hwif
->drives
[0];
689 ide_drive_t
*drive1
= &hwif
->drives
[1];
691 if (drive0
->present
== 0 || drive1
->present
== 0)
694 /* If the models don't match they are not the same product */
695 if (strcmp(drive0
->id
->model
, drive1
->id
->model
))
698 /* Serial numbers do not match */
699 if (strncmp(drive0
->id
->serial_no
, drive1
->id
->serial_no
, 20))
702 /* No serial number, thankfully very rare for CF */
703 if (drive0
->id
->serial_no
[0] == 0)
706 /* Appears to be an IDE flash adapter with decode bugs */
707 printk(KERN_WARNING
"ide-probe: ignoring undecoded slave\n");
712 EXPORT_SYMBOL_GPL(ide_undecoded_slave
);
715 * This routine only knows how to look for drive units 0 and 1
716 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
718 static void probe_hwif(ide_hwif_t
*hwif
)
727 if ((hwif
->chipset
!= ide_4drives
|| !hwif
->mate
|| !hwif
->mate
->present
) &&
728 (ide_hwif_request_regions(hwif
))) {
730 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
731 ide_drive_t
*drive
= &hwif
->drives
[unit
];
732 if (drive
->present
) {
734 printk(KERN_ERR
"%s: ERROR, PORTS ALREADY IN USE\n",
740 printk(KERN_ERR
"%s: ports already in use, skipping probe\n",
746 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
747 * we'll install our IRQ driver much later...
751 disable_irq(hwif
->irq
);
753 local_irq_set(flags
);
755 /* This is needed on some PPCs and a bunch of BIOS-less embedded
756 * platforms. Typical cases are:
758 * - The firmware hard reset the disk before booting the kernel,
759 * the drive is still doing it's poweron-reset sequence, that
760 * can take up to 30 seconds
761 * - The firmware does nothing (or no firmware), the device is
762 * still in POST state (same as above actually).
763 * - Some CD/DVD/Writer combo drives tend to drive the bus during
764 * their reset sequence even when they are non-selected slave
765 * devices, thus preventing discovery of the main HD
767 * Doing this wait-for-busy should not harm any existing configuration
768 * (at least things won't be worse than what current code does, that
769 * is blindly go & talk to the drive) and fix some issues like the
774 if (wait_hwif_ready(hwif
) == -EBUSY
)
775 printk(KERN_DEBUG
"%s: Wait for ready failed before probe !\n", hwif
->name
);
778 * Need to probe slave device first to make it release PDIAG-.
780 for (unit
= MAX_DRIVES
- 1; unit
>= 0; 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
);
823 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
824 ide_drive_t
*drive
= &hwif
->drives
[unit
];
826 if (drive
->present
) {
827 if (drive
->autotune
== IDE_TUNE_AUTO
)
828 ide_set_max_pio(drive
);
830 if (drive
->autotune
!= IDE_TUNE_DEFAULT
&&
831 drive
->autotune
!= IDE_TUNE_AUTO
)
836 if (hwif
->ide_dma_on
)
841 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
842 ide_drive_t
*drive
= &hwif
->drives
[unit
];
844 if (hwif
->no_io_32bit
)
845 drive
->no_io_32bit
= 1;
847 drive
->no_io_32bit
= drive
->id
->dword_io
? 1 : 0;
851 static int hwif_init(ide_hwif_t
*hwif
);
852 static void hwif_register_devices(ide_hwif_t
*hwif
);
854 static int probe_hwif_init(ide_hwif_t
*hwif
)
858 if (!hwif_init(hwif
)) {
859 printk(KERN_INFO
"%s: failed to initialize IDE interface\n",
865 hwif_register_devices(hwif
);
872 * save_match() is used to simplify logic in init_irq() below.
874 * A loophole here is that we may not know about a particular
875 * hwif's irq until after that hwif is actually probed/initialized..
876 * This could be a problem for the case where an hwif is on a
877 * dual interface that requires serialization (eg. cmd640) and another
878 * hwif using one of the same irqs is initialized beforehand.
880 * This routine detects and reports such situations, but does not fix them.
882 static void save_match(ide_hwif_t
*hwif
, ide_hwif_t
*new, ide_hwif_t
**match
)
884 ide_hwif_t
*m
= *match
;
886 if (m
&& m
->hwgroup
&& m
->hwgroup
!= new->hwgroup
) {
889 printk("%s: potential irq problem with %s and %s\n",
890 hwif
->name
, new->name
, m
->name
);
892 if (!m
|| m
->irq
!= hwif
->irq
) /* don't undo a prior perfect match */
895 #endif /* MAX_HWIFS > 1 */
900 static int ide_init_queue(ide_drive_t
*drive
)
902 struct request_queue
*q
;
903 ide_hwif_t
*hwif
= HWIF(drive
);
904 int max_sectors
= 256;
905 int max_sg_entries
= PRD_ENTRIES
;
908 * Our default set up assumes the normal IDE case,
909 * that is 64K segmenting, standard PRD setup
910 * and LBA28. Some drivers then impose their own
911 * limits and LBA48 we could raise it but as yet
915 q
= blk_init_queue_node(do_ide_request
, &ide_lock
, hwif_to_node(hwif
));
919 q
->queuedata
= drive
;
920 blk_queue_segment_boundary(q
, 0xffff);
923 if ((hwif
->host_flags
& IDE_HFLAG_NO_LBA48
) ||
924 (hwif
->host_flags
& IDE_HFLAG_NO_LBA48_DMA
))
927 hwif
->rqsize
= 65536;
929 if (hwif
->rqsize
< max_sectors
)
930 max_sectors
= hwif
->rqsize
;
931 blk_queue_max_sectors(q
, max_sectors
);
934 /* When we have an IOMMU, we may have a problem where pci_map_sg()
935 * creates segments that don't completely match our boundary
936 * requirements and thus need to be broken up again. Because it
937 * doesn't align properly either, we may actually have to break up
938 * to more segments than what was we got in the first place, a max
939 * worst case is twice as many.
940 * This will be fixed once we teach pci_map_sg() about our boundary
941 * requirements, hopefully soon. *FIXME*
943 if (!PCI_DMA_BUS_IS_PHYS
)
944 max_sg_entries
>>= 1;
945 #endif /* CONFIG_PCI */
947 blk_queue_max_hw_segments(q
, max_sg_entries
);
948 blk_queue_max_phys_segments(q
, max_sg_entries
);
950 /* assign drive queue */
953 /* needs drive->queue to be set */
954 ide_toggle_bounce(drive
, 1);
960 * This routine sets up the irq for an ide interface, and creates a new
961 * hwgroup for the irq/hwif if none was previously assigned.
963 * Much of the code is for correctly detecting/handling irq sharing
964 * and irq serialization situations. This is somewhat complex because
965 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
967 static int init_irq (ide_hwif_t
*hwif
)
970 ide_hwgroup_t
*hwgroup
;
971 ide_hwif_t
*match
= NULL
;
974 BUG_ON(in_interrupt());
975 BUG_ON(irqs_disabled());
976 BUG_ON(hwif
== NULL
);
978 mutex_lock(&ide_cfg_mtx
);
979 hwif
->hwgroup
= NULL
;
982 * Group up with any other hwifs that share our irq(s).
984 for (index
= 0; index
< MAX_HWIFS
; index
++) {
985 ide_hwif_t
*h
= &ide_hwifs
[index
];
986 if (h
->hwgroup
) { /* scan only initialized hwif's */
987 if (hwif
->irq
== h
->irq
) {
988 hwif
->sharing_irq
= h
->sharing_irq
= 1;
989 if (hwif
->chipset
!= ide_pci
||
990 h
->chipset
!= ide_pci
) {
991 save_match(hwif
, h
, &match
);
994 if (hwif
->serialized
) {
995 if (hwif
->mate
&& hwif
->mate
->irq
== h
->irq
)
996 save_match(hwif
, h
, &match
);
999 if (h
->mate
&& hwif
->irq
== h
->mate
->irq
)
1000 save_match(hwif
, h
, &match
);
1004 #endif /* MAX_HWIFS > 1 */
1006 * If we are still without a hwgroup, then form a new one
1009 hwgroup
= match
->hwgroup
;
1010 hwif
->hwgroup
= hwgroup
;
1012 * Link us into the hwgroup.
1013 * This must be done early, do ensure that unexpected_intr
1014 * can find the hwif and prevent irq storms.
1015 * No drives are attached to the new hwif, choose_drive
1016 * can't do anything stupid (yet).
1017 * Add ourself as the 2nd entry to the hwgroup->hwif
1018 * linked list, the first entry is the hwif that owns
1019 * hwgroup->handler - do not change that.
1021 spin_lock_irq(&ide_lock
);
1022 hwif
->next
= hwgroup
->hwif
->next
;
1023 hwgroup
->hwif
->next
= hwif
;
1024 spin_unlock_irq(&ide_lock
);
1026 hwgroup
= kmalloc_node(sizeof(ide_hwgroup_t
),
1027 GFP_KERNEL
| __GFP_ZERO
,
1028 hwif_to_node(hwif
->drives
[0].hwif
));
1032 hwif
->hwgroup
= hwgroup
;
1034 hwgroup
->hwif
= hwif
->next
= hwif
;
1036 hwgroup
->handler
= NULL
;
1037 hwgroup
->drive
= NULL
;
1039 init_timer(&hwgroup
->timer
);
1040 hwgroup
->timer
.function
= &ide_timer_expiry
;
1041 hwgroup
->timer
.data
= (unsigned long) hwgroup
;
1045 * Allocate the irq, if not already obtained for another hwif
1047 if (!match
|| match
->irq
!= hwif
->irq
) {
1049 #if defined(__mc68000__) || defined(CONFIG_APUS)
1051 #endif /* __mc68000__ || CONFIG_APUS */
1053 if (IDE_CHIPSET_IS_PCI(hwif
->chipset
))
1056 if (hwif
->io_ports
[IDE_CONTROL_OFFSET
])
1058 hwif
->OUTB(0x08, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
1060 if (request_irq(hwif
->irq
,&ide_intr
,sa
,hwif
->name
,hwgroup
))
1065 * For any present drive:
1066 * - allocate the block device queue
1067 * - link drive into the hwgroup
1069 for (index
= 0; index
< MAX_DRIVES
; ++index
) {
1070 ide_drive_t
*drive
= &hwif
->drives
[index
];
1071 if (!drive
->present
)
1073 if (ide_init_queue(drive
)) {
1074 printk(KERN_ERR
"ide: failed to init %s\n",drive
->name
);
1077 spin_lock_irq(&ide_lock
);
1078 if (!hwgroup
->drive
) {
1079 /* first drive for hwgroup. */
1080 drive
->next
= drive
;
1081 hwgroup
->drive
= drive
;
1082 hwgroup
->hwif
= HWIF(hwgroup
->drive
);
1084 drive
->next
= hwgroup
->drive
->next
;
1085 hwgroup
->drive
->next
= drive
;
1087 spin_unlock_irq(&ide_lock
);
1090 #if !defined(__mc68000__) && !defined(CONFIG_APUS)
1091 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif
->name
,
1092 hwif
->io_ports
[IDE_DATA_OFFSET
],
1093 hwif
->io_ports
[IDE_DATA_OFFSET
]+7,
1094 hwif
->io_ports
[IDE_CONTROL_OFFSET
], hwif
->irq
);
1096 printk("%s at 0x%08lx on irq %d", hwif
->name
,
1097 hwif
->io_ports
[IDE_DATA_OFFSET
], hwif
->irq
);
1098 #endif /* __mc68000__ && CONFIG_APUS */
1100 printk(" (%sed with %s)",
1101 hwif
->sharing_irq
? "shar" : "serializ", match
->name
);
1103 mutex_unlock(&ide_cfg_mtx
);
1106 spin_lock_irq(&ide_lock
);
1107 if (hwif
->next
== hwif
) {
1109 BUG_ON(hwgroup
->hwif
!= hwif
);
1114 while (g
->next
!= hwif
)
1116 g
->next
= hwif
->next
;
1117 if (hwgroup
->hwif
== hwif
) {
1119 printk(KERN_ERR
"Duh. Uninitialized hwif listed as active hwif.\n");
1122 BUG_ON(hwgroup
->hwif
== hwif
);
1124 spin_unlock_irq(&ide_lock
);
1126 mutex_unlock(&ide_cfg_mtx
);
1130 static int ata_lock(dev_t dev
, void *data
)
1132 /* FIXME: we want to pin hwif down */
1136 static struct kobject
*ata_probe(dev_t dev
, int *part
, void *data
)
1138 ide_hwif_t
*hwif
= data
;
1139 int unit
= *part
>> PARTN_BITS
;
1140 ide_drive_t
*drive
= &hwif
->drives
[unit
];
1141 if (!drive
->present
)
1144 if (drive
->media
== ide_disk
)
1145 request_module("ide-disk");
1147 request_module("ide-scsi");
1148 if (drive
->media
== ide_cdrom
|| drive
->media
== ide_optical
)
1149 request_module("ide-cd");
1150 if (drive
->media
== ide_tape
)
1151 request_module("ide-tape");
1152 if (drive
->media
== ide_floppy
)
1153 request_module("ide-floppy");
1158 static struct kobject
*exact_match(dev_t dev
, int *part
, void *data
)
1160 struct gendisk
*p
= data
;
1161 *part
&= (1 << PARTN_BITS
) - 1;
1162 return &p
->dev
.kobj
;
1165 static int exact_lock(dev_t dev
, void *data
)
1167 struct gendisk
*p
= data
;
1174 void ide_register_region(struct gendisk
*disk
)
1176 blk_register_region(MKDEV(disk
->major
, disk
->first_minor
),
1177 disk
->minors
, NULL
, exact_match
, exact_lock
, disk
);
1180 EXPORT_SYMBOL_GPL(ide_register_region
);
1182 void ide_unregister_region(struct gendisk
*disk
)
1184 blk_unregister_region(MKDEV(disk
->major
, disk
->first_minor
),
1188 EXPORT_SYMBOL_GPL(ide_unregister_region
);
1190 void ide_init_disk(struct gendisk
*disk
, ide_drive_t
*drive
)
1192 ide_hwif_t
*hwif
= drive
->hwif
;
1193 unsigned int unit
= (drive
->select
.all
>> 4) & 1;
1195 disk
->major
= hwif
->major
;
1196 disk
->first_minor
= unit
<< PARTN_BITS
;
1197 sprintf(disk
->disk_name
, "hd%c", 'a' + hwif
->index
* MAX_DRIVES
+ unit
);
1198 disk
->queue
= drive
->queue
;
1201 EXPORT_SYMBOL_GPL(ide_init_disk
);
1203 static void ide_remove_drive_from_hwgroup(ide_drive_t
*drive
)
1205 ide_hwgroup_t
*hwgroup
= drive
->hwif
->hwgroup
;
1207 if (drive
== drive
->next
) {
1208 /* special case: last drive from hwgroup. */
1209 BUG_ON(hwgroup
->drive
!= drive
);
1210 hwgroup
->drive
= NULL
;
1214 walk
= hwgroup
->drive
;
1215 while (walk
->next
!= drive
)
1217 walk
->next
= drive
->next
;
1218 if (hwgroup
->drive
== drive
) {
1219 hwgroup
->drive
= drive
->next
;
1220 hwgroup
->hwif
= hwgroup
->drive
->hwif
;
1223 BUG_ON(hwgroup
->drive
== drive
);
1226 static void drive_release_dev (struct device
*dev
)
1228 ide_drive_t
*drive
= container_of(dev
, ide_drive_t
, gendev
);
1230 spin_lock_irq(&ide_lock
);
1231 ide_remove_drive_from_hwgroup(drive
);
1235 /* Messed up locking ... */
1236 spin_unlock_irq(&ide_lock
);
1237 blk_cleanup_queue(drive
->queue
);
1238 spin_lock_irq(&ide_lock
);
1239 drive
->queue
= NULL
;
1240 spin_unlock_irq(&ide_lock
);
1242 complete(&drive
->gendev_rel_comp
);
1246 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1247 * after probing for drives, to allocate partition tables and other data
1248 * structures needed for the routines in genhd.c. ide_geninit() gets called
1249 * somewhat later, during the partition check.
1251 static void init_gendisk (ide_hwif_t
*hwif
)
1255 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
1256 ide_drive_t
* drive
= &hwif
->drives
[unit
];
1257 ide_add_generic_settings(drive
);
1258 snprintf(drive
->gendev
.bus_id
,BUS_ID_SIZE
,"%u.%u",
1260 drive
->gendev
.parent
= &hwif
->gendev
;
1261 drive
->gendev
.bus
= &ide_bus_type
;
1262 drive
->gendev
.driver_data
= drive
;
1263 drive
->gendev
.release
= drive_release_dev
;
1265 blk_register_region(MKDEV(hwif
->major
, 0), MAX_DRIVES
<< PARTN_BITS
,
1266 THIS_MODULE
, ata_probe
, ata_lock
, hwif
);
1269 static int hwif_init(ide_hwif_t
*hwif
)
1273 /* Return success if no device is connected */
1278 if (!(hwif
->irq
= ide_default_irq(hwif
->io_ports
[IDE_DATA_OFFSET
])))
1280 printk("%s: DISABLED, NO IRQ\n", hwif
->name
);
1281 return (hwif
->present
= 0);
1284 #ifdef CONFIG_BLK_DEV_HD
1285 if (hwif
->irq
== HD_IRQ
&& hwif
->io_ports
[IDE_DATA_OFFSET
] != HD_DATA
) {
1286 printk("%s: CANNOT SHARE IRQ WITH OLD "
1287 "HARDDISK DRIVER (hd.c)\n", hwif
->name
);
1288 return (hwif
->present
= 0);
1290 #endif /* CONFIG_BLK_DEV_HD */
1292 /* we set it back to 1 if all is ok below */
1295 if (register_blkdev(hwif
->major
, hwif
->name
))
1298 if (!hwif
->sg_max_nents
)
1299 hwif
->sg_max_nents
= PRD_ENTRIES
;
1301 hwif
->sg_table
= kmalloc(sizeof(struct scatterlist
)*hwif
->sg_max_nents
,
1303 if (!hwif
->sg_table
) {
1304 printk(KERN_ERR
"%s: unable to allocate SG table.\n", hwif
->name
);
1308 sg_init_table(hwif
->sg_table
, hwif
->sg_max_nents
);
1310 if (init_irq(hwif
) == 0)
1313 old_irq
= hwif
->irq
;
1315 * It failed to initialise. Find the default IRQ for
1316 * this port and try that.
1318 if (!(hwif
->irq
= ide_default_irq(hwif
->io_ports
[IDE_DATA_OFFSET
]))) {
1319 printk("%s: Disabled unable to get IRQ %d.\n",
1320 hwif
->name
, old_irq
);
1323 if (init_irq(hwif
)) {
1324 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1325 hwif
->name
, old_irq
, hwif
->irq
);
1328 printk("%s: probed IRQ %d failed, using default.\n",
1329 hwif
->name
, hwif
->irq
);
1334 ide_acpi_init(hwif
);
1336 hwif
->present
= 1; /* success */
1340 unregister_blkdev(hwif
->major
, hwif
->name
);
1344 static void hwif_register_devices(ide_hwif_t
*hwif
)
1348 for (i
= 0; i
< MAX_DRIVES
; i
++) {
1349 ide_drive_t
*drive
= &hwif
->drives
[i
];
1351 if (drive
->present
) {
1352 int ret
= device_register(&drive
->gendev
);
1355 printk(KERN_WARNING
"IDE: %s: "
1356 "device_register error: %d\n",
1362 int ideprobe_init (void)
1365 int probe
[MAX_HWIFS
];
1367 memset(probe
, 0, MAX_HWIFS
* sizeof(int));
1368 for (index
= 0; index
< MAX_HWIFS
; ++index
)
1369 probe
[index
] = !ide_hwifs
[index
].present
;
1371 for (index
= 0; index
< MAX_HWIFS
; ++index
)
1373 probe_hwif(&ide_hwifs
[index
]);
1374 for (index
= 0; index
< MAX_HWIFS
; ++index
)
1376 hwif_init(&ide_hwifs
[index
]);
1377 for (index
= 0; index
< MAX_HWIFS
; ++index
) {
1379 ide_hwif_t
*hwif
= &ide_hwifs
[index
];
1382 if (hwif
->chipset
== ide_unknown
|| hwif
->chipset
== ide_forced
)
1383 hwif
->chipset
= ide_generic
;
1384 hwif_register_devices(hwif
);
1387 for (index
= 0; index
< MAX_HWIFS
; ++index
)
1389 ide_proc_register_port(&ide_hwifs
[index
]);
1393 EXPORT_SYMBOL_GPL(ideprobe_init
);
1395 int ide_device_add(u8 idx
[4])
1399 for (i
= 0; i
< 4; i
++) {
1401 rc
|= probe_hwif_init(&ide_hwifs
[idx
[i
]]);
1404 for (i
= 0; i
< 4; i
++) {
1406 ide_proc_register_port(&ide_hwifs
[idx
[i
]]);
1412 EXPORT_SYMBOL_GPL(ide_device_add
);
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