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
);
133 printk(KERN_INFO
"%s: dumping identify data\n", drive
->name
);
134 ide_dump_identify((u8
*)id
);
138 #if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
140 * EATA SCSI controllers do a hardware ATA emulation:
141 * Ignore them if there is a driver for them available.
143 if ((id
->model
[0] == 'P' && id
->model
[1] == 'M') ||
144 (id
->model
[0] == 'S' && id
->model
[1] == 'K')) {
145 printk("%s: EATA SCSI HBA %.10s\n", drive
->name
, id
->model
);
148 #endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
151 * WIN_IDENTIFY returns little-endian info,
152 * WIN_PIDENTIFY *usually* returns little-endian info.
154 if (cmd
== WIN_PIDENTIFY
) {
155 if ((id
->model
[0] == 'N' && id
->model
[1] == 'E') /* NEC */
156 || (id
->model
[0] == 'F' && id
->model
[1] == 'X') /* Mitsumi */
157 || (id
->model
[0] == 'P' && id
->model
[1] == 'i'))/* Pioneer */
158 /* Vertos drives may still be weird */
161 ide_fixstring(id
->model
, sizeof(id
->model
), bswap
);
162 ide_fixstring(id
->fw_rev
, sizeof(id
->fw_rev
), bswap
);
163 ide_fixstring(id
->serial_no
, sizeof(id
->serial_no
), bswap
);
165 /* we depend on this a lot! */
166 id
->model
[sizeof(id
->model
)-1] = '\0';
168 if (strstr(id
->model
, "E X A B Y T E N E S T"))
171 printk("%s: %s, ", drive
->name
, id
->model
);
176 * Check for an ATAPI device
178 if (cmd
== WIN_PIDENTIFY
) {
179 u8 type
= (id
->config
>> 8) & 0x1f;
183 if (!strstr(id
->model
, "CD-ROM")) {
184 if (!strstr(id
->model
, "oppy") &&
185 !strstr(id
->model
, "poyp") &&
186 !strstr(id
->model
, "ZIP"))
187 printk("cdrom or floppy?, assuming ");
188 if (drive
->media
!= ide_cdrom
) {
190 drive
->removable
= 1;
194 /* Early cdrom models used zero */
197 drive
->removable
= 1;
199 /* kludge for Apple PowerBook internal zip */
200 if (!strstr(id
->model
, "CD-ROM") &&
201 strstr(id
->model
, "ZIP")) {
207 printk ("CD/DVD-ROM");
214 drive
->removable
= 1;
217 printk("UNKNOWN (type %d)", type
);
222 /* an ATAPI device ignores DRDY */
223 drive
->ready_stat
= 0;
228 * Not an ATAPI device: looks like a "regular" hard disk
232 * 0x848a = CompactFlash device
233 * These are *not* removable in Linux definition of the term
236 if ((id
->config
!= 0x848a) && (id
->config
& (1<<7)))
237 drive
->removable
= 1;
239 drive
->media
= ide_disk
;
240 printk("%s DISK drive\n", (id
->config
== 0x848a) ? "CFA" : "ATA" );
251 * actual_try_to_identify - send ata/atapi identify
252 * @drive: drive to identify
253 * @cmd: command to use
255 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
256 * and waits for a response. It also monitors irqs while this is
257 * happening, in hope of automatically determining which one is
258 * being used by the interface.
260 * Returns: 0 device was identified
261 * 1 device timed-out (no response to identify request)
262 * 2 device aborted the command (refused to identify itself)
265 static int actual_try_to_identify (ide_drive_t
*drive
, u8 cmd
)
267 ide_hwif_t
*hwif
= HWIF(drive
);
269 unsigned long hd_status
;
270 unsigned long timeout
;
273 /* take a deep breath */
276 if (IDE_CONTROL_REG
) {
277 a
= hwif
->INB(IDE_ALTSTATUS_REG
);
278 s
= hwif
->INB(IDE_STATUS_REG
);
279 if ((a
^ s
) & ~INDEX_STAT
) {
280 printk(KERN_INFO
"%s: probing with STATUS(0x%02x) instead of "
281 "ALTSTATUS(0x%02x)\n", drive
->name
, s
, a
);
282 /* ancient Seagate drives, broken interfaces */
283 hd_status
= IDE_STATUS_REG
;
285 /* use non-intrusive polling */
286 hd_status
= IDE_ALTSTATUS_REG
;
289 hd_status
= IDE_STATUS_REG
;
291 /* set features register for atapi
292 * identify command to be sure of reply
294 if ((cmd
== WIN_PIDENTIFY
))
295 /* disable dma & overlap */
296 hwif
->OUTB(0, IDE_FEATURE_REG
);
298 /* ask drive for ID */
299 hwif
->OUTB(cmd
, IDE_COMMAND_REG
);
301 timeout
= ((cmd
== WIN_IDENTIFY
) ? WAIT_WORSTCASE
: WAIT_PIDENTIFY
) / 2;
304 if (time_after(jiffies
, timeout
)) {
305 /* drive timed-out */
308 /* give drive a breather */
310 } while ((hwif
->INB(hd_status
)) & BUSY_STAT
);
312 /* wait for IRQ and DRQ_STAT */
314 if (OK_STAT((hwif
->INB(IDE_STATUS_REG
)), DRQ_STAT
, BAD_R_STAT
)) {
317 /* local CPU only; some systems need this */
318 local_irq_save(flags
);
319 /* drive returned ID */
320 do_identify(drive
, cmd
);
321 /* drive responded with ID */
323 /* clear drive IRQ */
324 (void) hwif
->INB(IDE_STATUS_REG
);
325 local_irq_restore(flags
);
327 /* drive refused ID */
334 * try_to_identify - try to identify a drive
335 * @drive: drive to probe
336 * @cmd: command to use
338 * Issue the identify command and then do IRQ probing to
339 * complete the identification when needed by finding the
340 * IRQ the drive is attached to
343 static int try_to_identify (ide_drive_t
*drive
, u8 cmd
)
345 ide_hwif_t
*hwif
= HWIF(drive
);
348 unsigned long cookie
= 0;
351 * Disable device irq unless we need to
352 * probe for it. Otherwise we'll get spurious
353 * interrupts during the identify-phase that
354 * the irq handler isn't expecting.
356 if (IDE_CONTROL_REG
) {
359 cookie
= probe_irq_on();
361 ide_set_irq(drive
, autoprobe
);
364 retval
= actual_try_to_identify(drive
, cmd
);
369 ide_set_irq(drive
, 0);
370 /* clear drive IRQ */
371 (void) hwif
->INB(IDE_STATUS_REG
);
373 irq
= probe_irq_off(cookie
);
378 /* Mmmm.. multiple IRQs..
379 * don't know which was ours
381 printk("%s: IRQ probe failed (0x%lx)\n",
382 drive
->name
, cookie
);
389 static int ide_busy_sleep(ide_hwif_t
*hwif
)
391 unsigned long timeout
= jiffies
+ WAIT_WORSTCASE
;
396 stat
= hwif
->INB(hwif
->io_ports
[IDE_STATUS_OFFSET
]);
397 if ((stat
& BUSY_STAT
) == 0)
399 } while (time_before(jiffies
, timeout
));
405 * do_probe - probe an IDE device
406 * @drive: drive to probe
407 * @cmd: command to use
409 * do_probe() has the difficult job of finding a drive if it exists,
410 * without getting hung up if it doesn't exist, without trampling on
411 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
413 * If a drive is "known" to exist (from CMOS or kernel parameters),
414 * but does not respond right away, the probe will "hang in there"
415 * for the maximum wait time (about 30 seconds), otherwise it will
416 * exit much more quickly.
418 * Returns: 0 device was identified
419 * 1 device timed-out (no response to identify request)
420 * 2 device aborted the command (refused to identify itself)
421 * 3 bad status from device (possible for ATAPI drives)
422 * 4 probe was not attempted because failure was obvious
425 static int do_probe (ide_drive_t
*drive
, u8 cmd
)
428 ide_hwif_t
*hwif
= HWIF(drive
);
430 if (drive
->present
) {
431 /* avoid waiting for inappropriate probes */
432 if ((drive
->media
!= ide_disk
) && (cmd
== WIN_IDENTIFY
))
436 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
437 drive
->name
, drive
->present
, drive
->media
,
438 (cmd
== WIN_IDENTIFY
) ? "ATA" : "ATAPI");
441 /* needed for some systems
442 * (e.g. crw9624 as drive0 with disk as slave)
447 if (hwif
->INB(IDE_SELECT_REG
) != drive
->select
.all
&& !drive
->present
) {
448 if (drive
->select
.b
.unit
!= 0) {
449 /* exit with drive0 selected */
450 SELECT_DRIVE(&hwif
->drives
[0]);
451 /* allow BUSY_STAT to assert & clear */
454 /* no i/f present: mmm.. this should be a 4 -ml */
458 if (OK_STAT((hwif
->INB(IDE_STATUS_REG
)), READY_STAT
, BUSY_STAT
) ||
459 drive
->present
|| cmd
== WIN_PIDENTIFY
) {
460 /* send cmd and wait */
461 if ((rc
= try_to_identify(drive
, cmd
))) {
462 /* failed: try again */
463 rc
= try_to_identify(drive
,cmd
);
465 if (hwif
->INB(IDE_STATUS_REG
) == (BUSY_STAT
|READY_STAT
))
468 if ((rc
== 1 && cmd
== WIN_PIDENTIFY
) &&
469 ((drive
->autotune
== IDE_TUNE_DEFAULT
) ||
470 (drive
->autotune
== IDE_TUNE_AUTO
))) {
471 printk("%s: no response (status = 0x%02x), "
472 "resetting drive\n", drive
->name
,
473 hwif
->INB(IDE_STATUS_REG
));
475 hwif
->OUTB(drive
->select
.all
, IDE_SELECT_REG
);
477 hwif
->OUTB(WIN_SRST
, IDE_COMMAND_REG
);
478 (void)ide_busy_sleep(hwif
);
479 rc
= try_to_identify(drive
, cmd
);
482 printk("%s: no response (status = 0x%02x)\n",
483 drive
->name
, hwif
->INB(IDE_STATUS_REG
));
484 /* ensure drive irq is clear */
485 (void) hwif
->INB(IDE_STATUS_REG
);
487 /* not present or maybe ATAPI */
490 if (drive
->select
.b
.unit
!= 0) {
491 /* exit with drive0 selected */
492 SELECT_DRIVE(&hwif
->drives
[0]);
494 /* ensure drive irq is clear */
495 (void) hwif
->INB(IDE_STATUS_REG
);
503 static void enable_nest (ide_drive_t
*drive
)
505 ide_hwif_t
*hwif
= HWIF(drive
);
507 printk("%s: enabling %s -- ", hwif
->name
, drive
->id
->model
);
510 hwif
->OUTB(EXABYTE_ENABLE_NEST
, IDE_COMMAND_REG
);
512 if (ide_busy_sleep(hwif
)) {
513 printk(KERN_CONT
"failed (timeout)\n");
519 if (!OK_STAT((hwif
->INB(IDE_STATUS_REG
)), 0, BAD_STAT
)) {
520 printk("failed (status = 0x%02x)\n", hwif
->INB(IDE_STATUS_REG
));
525 /* if !(success||timed-out) */
526 if (do_probe(drive
, WIN_IDENTIFY
) >= 2) {
527 /* look for ATAPI device */
528 (void) do_probe(drive
, WIN_PIDENTIFY
);
533 * probe_for_drives - upper level drive probe
534 * @drive: drive to probe for
536 * probe_for_drive() tests for existence of a given drive using do_probe()
537 * and presents things to the user as needed.
539 * Returns: 0 no device was found
540 * 1 device was found (note: drive->present might
544 static inline u8
probe_for_drive (ide_drive_t
*drive
)
547 * In order to keep things simple we have an id
548 * block for all drives at all times. If the device
549 * is pre ATA or refuses ATA/ATAPI identify we
550 * will add faked data to this.
552 * Also note that 0 everywhere means "can't do X"
555 drive
->id
= kzalloc(SECTOR_WORDS
*4, GFP_KERNEL
);
557 if(drive
->id
== NULL
)
559 printk(KERN_ERR
"ide: out of memory for id data.\n");
562 strcpy(drive
->id
->model
, "UNKNOWN");
567 /* if !(success||timed-out) */
568 if (do_probe(drive
, WIN_IDENTIFY
) >= 2) {
569 /* look for ATAPI device */
570 (void) do_probe(drive
, WIN_PIDENTIFY
);
573 /* drive not found */
575 if (strstr(drive
->id
->model
, "E X A B Y T E N E S T"))
578 /* identification failed? */
579 if (!drive
->id_read
) {
580 if (drive
->media
== ide_disk
) {
581 printk(KERN_INFO
"%s: non-IDE drive, CHS=%d/%d/%d\n",
582 drive
->name
, drive
->cyl
,
583 drive
->head
, drive
->sect
);
584 } else if (drive
->media
== ide_cdrom
) {
585 printk(KERN_INFO
"%s: ATAPI cdrom (?)\n", drive
->name
);
588 printk(KERN_WARNING
"%s: Unknown device on bus refused identification. Ignoring.\n", drive
->name
);
592 /* drive was found */
596 /* The drive wasn't being helpful. Add generic info only */
597 if (drive
->id_read
== 0) {
602 if (drive
->media
== ide_disk
) {
603 ide_disk_init_chs(drive
);
604 ide_disk_init_mult_count(drive
);
607 return drive
->present
;
610 static void hwif_release_dev (struct device
*dev
)
612 ide_hwif_t
*hwif
= container_of(dev
, ide_hwif_t
, gendev
);
614 complete(&hwif
->gendev_rel_comp
);
617 static void hwif_register (ide_hwif_t
*hwif
)
621 /* register with global device tree */
622 strlcpy(hwif
->gendev
.bus_id
,hwif
->name
,BUS_ID_SIZE
);
623 hwif
->gendev
.driver_data
= hwif
;
624 if (hwif
->gendev
.parent
== NULL
) {
626 hwif
->gendev
.parent
= hwif
->dev
;
628 /* Would like to do = &device_legacy */
629 hwif
->gendev
.parent
= NULL
;
631 hwif
->gendev
.release
= hwif_release_dev
;
632 ret
= device_register(&hwif
->gendev
);
634 printk(KERN_WARNING
"IDE: %s: device_register error: %d\n",
638 static int wait_hwif_ready(ide_hwif_t
*hwif
)
642 printk(KERN_DEBUG
"Probing IDE interface %s...\n", hwif
->name
);
644 /* Let HW settle down a bit from whatever init state we
648 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
649 * I know of at least one disk who takes 31 seconds, I use 35
652 rc
= ide_wait_not_busy(hwif
, 35000);
656 /* Now make sure both master & slave are ready */
657 for (unit
= 0; unit
< MAX_DRIVES
; unit
++) {
658 ide_drive_t
*drive
= &hwif
->drives
[unit
];
660 /* Ignore disks that we will not probe for later. */
661 if (!drive
->noprobe
|| drive
->present
) {
663 ide_set_irq(drive
, 1);
665 rc
= ide_wait_not_busy(hwif
, 35000);
669 printk(KERN_DEBUG
"%s: ide_wait_not_busy() skipped\n",
673 /* 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_drive_t
*drive1
)
691 ide_drive_t
*drive0
= &drive1
->hwif
->drives
[0];
693 if ((drive1
->dn
& 1) == 0 || drive0
->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
)
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 * Need to probe slave device first to make it release PDIAG-.
782 for (unit
= MAX_DRIVES
- 1; unit
>= 0; unit
--) {
783 ide_drive_t
*drive
= &hwif
->drives
[unit
];
784 drive
->dn
= (hwif
->channel
? 2 : 0) + unit
;
785 (void) probe_for_drive(drive
);
786 if (drive
->present
&& !hwif
->present
) {
788 if (hwif
->chipset
!= ide_4drives
||
790 !hwif
->mate
->present
) {
795 if (hwif
->io_ports
[IDE_CONTROL_OFFSET
] && hwif
->reset
) {
796 printk(KERN_WARNING
"%s: reset\n", hwif
->name
);
797 hwif
->OUTB(12, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
799 hwif
->OUTB(8, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
800 (void)ide_busy_sleep(hwif
);
802 local_irq_restore(flags
);
804 * Use cached IRQ number. It might be (and is...) changed by probe
810 if (!hwif
->present
) {
811 ide_hwif_release_regions(hwif
);
815 for (unit
= 0; unit
< MAX_DRIVES
; unit
++) {
816 ide_drive_t
*drive
= &hwif
->drives
[unit
];
818 if (drive
->present
&& hwif
->quirkproc
)
819 hwif
->quirkproc(drive
);
822 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
823 ide_drive_t
*drive
= &hwif
->drives
[unit
];
825 if (drive
->present
) {
826 if (drive
->autotune
== IDE_TUNE_AUTO
)
827 ide_set_max_pio(drive
);
829 if (drive
->autotune
!= IDE_TUNE_DEFAULT
&&
830 drive
->autotune
!= IDE_TUNE_AUTO
)
835 if (hwif
->dma_host_set
)
840 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
841 ide_drive_t
*drive
= &hwif
->drives
[unit
];
843 if (hwif
->no_io_32bit
)
844 drive
->no_io_32bit
= 1;
846 drive
->no_io_32bit
= drive
->id
->dword_io
? 1 : 0;
852 * save_match() is used to simplify logic in init_irq() below.
854 * A loophole here is that we may not know about a particular
855 * hwif's irq until after that hwif is actually probed/initialized..
856 * This could be a problem for the case where an hwif is on a
857 * dual interface that requires serialization (eg. cmd640) and another
858 * hwif using one of the same irqs is initialized beforehand.
860 * This routine detects and reports such situations, but does not fix them.
862 static void save_match(ide_hwif_t
*hwif
, ide_hwif_t
*new, ide_hwif_t
**match
)
864 ide_hwif_t
*m
= *match
;
866 if (m
&& m
->hwgroup
&& m
->hwgroup
!= new->hwgroup
) {
869 printk("%s: potential irq problem with %s and %s\n",
870 hwif
->name
, new->name
, m
->name
);
872 if (!m
|| m
->irq
!= hwif
->irq
) /* don't undo a prior perfect match */
875 #endif /* MAX_HWIFS > 1 */
880 static int ide_init_queue(ide_drive_t
*drive
)
882 struct request_queue
*q
;
883 ide_hwif_t
*hwif
= HWIF(drive
);
884 int max_sectors
= 256;
885 int max_sg_entries
= PRD_ENTRIES
;
888 * Our default set up assumes the normal IDE case,
889 * that is 64K segmenting, standard PRD setup
890 * and LBA28. Some drivers then impose their own
891 * limits and LBA48 we could raise it but as yet
895 q
= blk_init_queue_node(do_ide_request
, &ide_lock
, hwif_to_node(hwif
));
899 q
->queuedata
= drive
;
900 blk_queue_segment_boundary(q
, 0xffff);
903 if ((hwif
->host_flags
& IDE_HFLAG_NO_LBA48
) ||
904 (hwif
->host_flags
& IDE_HFLAG_NO_LBA48_DMA
))
907 hwif
->rqsize
= 65536;
909 if (hwif
->rqsize
< max_sectors
)
910 max_sectors
= hwif
->rqsize
;
911 blk_queue_max_sectors(q
, max_sectors
);
914 /* When we have an IOMMU, we may have a problem where pci_map_sg()
915 * creates segments that don't completely match our boundary
916 * requirements and thus need to be broken up again. Because it
917 * doesn't align properly either, we may actually have to break up
918 * to more segments than what was we got in the first place, a max
919 * worst case is twice as many.
920 * This will be fixed once we teach pci_map_sg() about our boundary
921 * requirements, hopefully soon. *FIXME*
923 if (!PCI_DMA_BUS_IS_PHYS
)
924 max_sg_entries
>>= 1;
925 #endif /* CONFIG_PCI */
927 blk_queue_max_hw_segments(q
, max_sg_entries
);
928 blk_queue_max_phys_segments(q
, max_sg_entries
);
930 /* assign drive queue */
933 /* needs drive->queue to be set */
934 ide_toggle_bounce(drive
, 1);
940 * This routine sets up the irq for an ide interface, and creates a new
941 * hwgroup for the irq/hwif if none was previously assigned.
943 * Much of the code is for correctly detecting/handling irq sharing
944 * and irq serialization situations. This is somewhat complex because
945 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
947 static int init_irq (ide_hwif_t
*hwif
)
950 ide_hwgroup_t
*hwgroup
;
951 ide_hwif_t
*match
= NULL
;
954 BUG_ON(in_interrupt());
955 BUG_ON(irqs_disabled());
956 BUG_ON(hwif
== NULL
);
958 mutex_lock(&ide_cfg_mtx
);
959 hwif
->hwgroup
= NULL
;
962 * Group up with any other hwifs that share our irq(s).
964 for (index
= 0; index
< MAX_HWIFS
; index
++) {
965 ide_hwif_t
*h
= &ide_hwifs
[index
];
966 if (h
->hwgroup
) { /* scan only initialized hwif's */
967 if (hwif
->irq
== h
->irq
) {
968 hwif
->sharing_irq
= h
->sharing_irq
= 1;
969 if (hwif
->chipset
!= ide_pci
||
970 h
->chipset
!= ide_pci
) {
971 save_match(hwif
, h
, &match
);
974 if (hwif
->serialized
) {
975 if (hwif
->mate
&& hwif
->mate
->irq
== h
->irq
)
976 save_match(hwif
, h
, &match
);
979 if (h
->mate
&& hwif
->irq
== h
->mate
->irq
)
980 save_match(hwif
, h
, &match
);
984 #endif /* MAX_HWIFS > 1 */
986 * If we are still without a hwgroup, then form a new one
989 hwgroup
= match
->hwgroup
;
990 hwif
->hwgroup
= hwgroup
;
992 * Link us into the hwgroup.
993 * This must be done early, do ensure that unexpected_intr
994 * can find the hwif and prevent irq storms.
995 * No drives are attached to the new hwif, choose_drive
996 * can't do anything stupid (yet).
997 * Add ourself as the 2nd entry to the hwgroup->hwif
998 * linked list, the first entry is the hwif that owns
999 * hwgroup->handler - do not change that.
1001 spin_lock_irq(&ide_lock
);
1002 hwif
->next
= hwgroup
->hwif
->next
;
1003 hwgroup
->hwif
->next
= hwif
;
1004 spin_unlock_irq(&ide_lock
);
1006 hwgroup
= kmalloc_node(sizeof(ide_hwgroup_t
),
1007 GFP_KERNEL
| __GFP_ZERO
,
1008 hwif_to_node(hwif
->drives
[0].hwif
));
1012 hwif
->hwgroup
= hwgroup
;
1014 hwgroup
->hwif
= hwif
->next
= hwif
;
1016 hwgroup
->handler
= NULL
;
1017 hwgroup
->drive
= NULL
;
1019 init_timer(&hwgroup
->timer
);
1020 hwgroup
->timer
.function
= &ide_timer_expiry
;
1021 hwgroup
->timer
.data
= (unsigned long) hwgroup
;
1025 * Allocate the irq, if not already obtained for another hwif
1027 if (!match
|| match
->irq
!= hwif
->irq
) {
1029 #if defined(__mc68000__) || defined(CONFIG_APUS)
1031 #endif /* __mc68000__ || CONFIG_APUS */
1033 if (IDE_CHIPSET_IS_PCI(hwif
->chipset
))
1036 if (hwif
->io_ports
[IDE_CONTROL_OFFSET
])
1038 hwif
->OUTB(0x08, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
1040 if (request_irq(hwif
->irq
,&ide_intr
,sa
,hwif
->name
,hwgroup
))
1045 * For any present drive:
1046 * - allocate the block device queue
1047 * - link drive into the hwgroup
1049 for (index
= 0; index
< MAX_DRIVES
; ++index
) {
1050 ide_drive_t
*drive
= &hwif
->drives
[index
];
1051 if (!drive
->present
)
1053 if (ide_init_queue(drive
)) {
1054 printk(KERN_ERR
"ide: failed to init %s\n",drive
->name
);
1057 spin_lock_irq(&ide_lock
);
1058 if (!hwgroup
->drive
) {
1059 /* first drive for hwgroup. */
1060 drive
->next
= drive
;
1061 hwgroup
->drive
= drive
;
1062 hwgroup
->hwif
= HWIF(hwgroup
->drive
);
1064 drive
->next
= hwgroup
->drive
->next
;
1065 hwgroup
->drive
->next
= drive
;
1067 spin_unlock_irq(&ide_lock
);
1070 #if !defined(__mc68000__) && !defined(CONFIG_APUS)
1071 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif
->name
,
1072 hwif
->io_ports
[IDE_DATA_OFFSET
],
1073 hwif
->io_ports
[IDE_DATA_OFFSET
]+7,
1074 hwif
->io_ports
[IDE_CONTROL_OFFSET
], hwif
->irq
);
1076 printk("%s at 0x%08lx on irq %d", hwif
->name
,
1077 hwif
->io_ports
[IDE_DATA_OFFSET
], hwif
->irq
);
1078 #endif /* __mc68000__ && CONFIG_APUS */
1080 printk(" (%sed with %s)",
1081 hwif
->sharing_irq
? "shar" : "serializ", match
->name
);
1083 mutex_unlock(&ide_cfg_mtx
);
1086 spin_lock_irq(&ide_lock
);
1087 if (hwif
->next
== hwif
) {
1089 BUG_ON(hwgroup
->hwif
!= hwif
);
1094 while (g
->next
!= hwif
)
1096 g
->next
= hwif
->next
;
1097 if (hwgroup
->hwif
== hwif
) {
1099 printk(KERN_ERR
"Duh. Uninitialized hwif listed as active hwif.\n");
1102 BUG_ON(hwgroup
->hwif
== hwif
);
1104 spin_unlock_irq(&ide_lock
);
1106 mutex_unlock(&ide_cfg_mtx
);
1110 static int ata_lock(dev_t dev
, void *data
)
1112 /* FIXME: we want to pin hwif down */
1116 static struct kobject
*ata_probe(dev_t dev
, int *part
, void *data
)
1118 ide_hwif_t
*hwif
= data
;
1119 int unit
= *part
>> PARTN_BITS
;
1120 ide_drive_t
*drive
= &hwif
->drives
[unit
];
1121 if (!drive
->present
)
1124 if (drive
->media
== ide_disk
)
1125 request_module("ide-disk");
1127 request_module("ide-scsi");
1128 if (drive
->media
== ide_cdrom
|| drive
->media
== ide_optical
)
1129 request_module("ide-cd");
1130 if (drive
->media
== ide_tape
)
1131 request_module("ide-tape");
1132 if (drive
->media
== ide_floppy
)
1133 request_module("ide-floppy");
1138 static struct kobject
*exact_match(dev_t dev
, int *part
, void *data
)
1140 struct gendisk
*p
= data
;
1141 *part
&= (1 << PARTN_BITS
) - 1;
1142 return &p
->dev
.kobj
;
1145 static int exact_lock(dev_t dev
, void *data
)
1147 struct gendisk
*p
= data
;
1154 void ide_register_region(struct gendisk
*disk
)
1156 blk_register_region(MKDEV(disk
->major
, disk
->first_minor
),
1157 disk
->minors
, NULL
, exact_match
, exact_lock
, disk
);
1160 EXPORT_SYMBOL_GPL(ide_register_region
);
1162 void ide_unregister_region(struct gendisk
*disk
)
1164 blk_unregister_region(MKDEV(disk
->major
, disk
->first_minor
),
1168 EXPORT_SYMBOL_GPL(ide_unregister_region
);
1170 void ide_init_disk(struct gendisk
*disk
, ide_drive_t
*drive
)
1172 ide_hwif_t
*hwif
= drive
->hwif
;
1173 unsigned int unit
= (drive
->select
.all
>> 4) & 1;
1175 disk
->major
= hwif
->major
;
1176 disk
->first_minor
= unit
<< PARTN_BITS
;
1177 sprintf(disk
->disk_name
, "hd%c", 'a' + hwif
->index
* MAX_DRIVES
+ unit
);
1178 disk
->queue
= drive
->queue
;
1181 EXPORT_SYMBOL_GPL(ide_init_disk
);
1183 static void ide_remove_drive_from_hwgroup(ide_drive_t
*drive
)
1185 ide_hwgroup_t
*hwgroup
= drive
->hwif
->hwgroup
;
1187 if (drive
== drive
->next
) {
1188 /* special case: last drive from hwgroup. */
1189 BUG_ON(hwgroup
->drive
!= drive
);
1190 hwgroup
->drive
= NULL
;
1194 walk
= hwgroup
->drive
;
1195 while (walk
->next
!= drive
)
1197 walk
->next
= drive
->next
;
1198 if (hwgroup
->drive
== drive
) {
1199 hwgroup
->drive
= drive
->next
;
1200 hwgroup
->hwif
= hwgroup
->drive
->hwif
;
1203 BUG_ON(hwgroup
->drive
== drive
);
1206 static void drive_release_dev (struct device
*dev
)
1208 ide_drive_t
*drive
= container_of(dev
, ide_drive_t
, gendev
);
1210 spin_lock_irq(&ide_lock
);
1211 ide_remove_drive_from_hwgroup(drive
);
1215 /* Messed up locking ... */
1216 spin_unlock_irq(&ide_lock
);
1217 blk_cleanup_queue(drive
->queue
);
1218 spin_lock_irq(&ide_lock
);
1219 drive
->queue
= NULL
;
1220 spin_unlock_irq(&ide_lock
);
1222 complete(&drive
->gendev_rel_comp
);
1226 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1227 * after probing for drives, to allocate partition tables and other data
1228 * structures needed for the routines in genhd.c. ide_geninit() gets called
1229 * somewhat later, during the partition check.
1231 static void init_gendisk (ide_hwif_t
*hwif
)
1235 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
1236 ide_drive_t
* drive
= &hwif
->drives
[unit
];
1237 ide_add_generic_settings(drive
);
1238 snprintf(drive
->gendev
.bus_id
,BUS_ID_SIZE
,"%u.%u",
1240 drive
->gendev
.parent
= &hwif
->gendev
;
1241 drive
->gendev
.bus
= &ide_bus_type
;
1242 drive
->gendev
.driver_data
= drive
;
1243 drive
->gendev
.release
= drive_release_dev
;
1245 blk_register_region(MKDEV(hwif
->major
, 0), MAX_DRIVES
<< PARTN_BITS
,
1246 THIS_MODULE
, ata_probe
, ata_lock
, hwif
);
1249 static int hwif_init(ide_hwif_t
*hwif
)
1253 /* Return success if no device is connected */
1258 if (!(hwif
->irq
= ide_default_irq(hwif
->io_ports
[IDE_DATA_OFFSET
])))
1260 printk("%s: DISABLED, NO IRQ\n", hwif
->name
);
1261 return (hwif
->present
= 0);
1264 #ifdef CONFIG_BLK_DEV_HD
1265 if (hwif
->irq
== HD_IRQ
&& hwif
->io_ports
[IDE_DATA_OFFSET
] != HD_DATA
) {
1266 printk("%s: CANNOT SHARE IRQ WITH OLD "
1267 "HARDDISK DRIVER (hd.c)\n", hwif
->name
);
1268 return (hwif
->present
= 0);
1270 #endif /* CONFIG_BLK_DEV_HD */
1272 /* we set it back to 1 if all is ok below */
1275 if (register_blkdev(hwif
->major
, hwif
->name
))
1278 if (!hwif
->sg_max_nents
)
1279 hwif
->sg_max_nents
= PRD_ENTRIES
;
1281 hwif
->sg_table
= kmalloc(sizeof(struct scatterlist
)*hwif
->sg_max_nents
,
1283 if (!hwif
->sg_table
) {
1284 printk(KERN_ERR
"%s: unable to allocate SG table.\n", hwif
->name
);
1288 sg_init_table(hwif
->sg_table
, hwif
->sg_max_nents
);
1290 if (init_irq(hwif
) == 0)
1293 old_irq
= hwif
->irq
;
1295 * It failed to initialise. Find the default IRQ for
1296 * this port and try that.
1298 if (!(hwif
->irq
= ide_default_irq(hwif
->io_ports
[IDE_DATA_OFFSET
]))) {
1299 printk("%s: Disabled unable to get IRQ %d.\n",
1300 hwif
->name
, old_irq
);
1303 if (init_irq(hwif
)) {
1304 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1305 hwif
->name
, old_irq
, hwif
->irq
);
1308 printk("%s: probed IRQ %d failed, using default.\n",
1309 hwif
->name
, hwif
->irq
);
1314 ide_acpi_init(hwif
);
1316 hwif
->present
= 1; /* success */
1320 unregister_blkdev(hwif
->major
, hwif
->name
);
1324 static void hwif_register_devices(ide_hwif_t
*hwif
)
1328 for (i
= 0; i
< MAX_DRIVES
; i
++) {
1329 ide_drive_t
*drive
= &hwif
->drives
[i
];
1331 if (drive
->present
) {
1332 int ret
= device_register(&drive
->gendev
);
1335 printk(KERN_WARNING
"IDE: %s: "
1336 "device_register error: %d\n",
1342 int ide_device_add_all(u8
*idx
)
1347 for (i
= 0; i
< MAX_HWIFS
; i
++) {
1351 probe_hwif(&ide_hwifs
[idx
[i
]]);
1354 for (i
= 0; i
< MAX_HWIFS
; i
++) {
1358 hwif
= &ide_hwifs
[idx
[i
]];
1360 if (hwif_init(hwif
) == 0) {
1361 printk(KERN_INFO
"%s: failed to initialize IDE "
1362 "interface\n", hwif
->name
);
1368 for (i
= 0; i
< MAX_HWIFS
; i
++) {
1372 hwif
= &ide_hwifs
[idx
[i
]];
1374 if (hwif
->present
) {
1375 if (hwif
->chipset
== ide_unknown
||
1376 hwif
->chipset
== ide_forced
)
1377 hwif
->chipset
= ide_generic
;
1378 hwif_register_devices(hwif
);
1382 for (i
= 0; i
< MAX_HWIFS
; i
++) {
1384 ide_proc_register_port(&ide_hwifs
[idx
[i
]]);
1389 EXPORT_SYMBOL_GPL(ide_device_add_all
);
1391 int ide_device_add(u8 idx
[4])
1393 u8 idx_all
[MAX_HWIFS
];
1396 for (i
= 0; i
< MAX_HWIFS
; i
++)
1397 idx_all
[i
] = (i
< 4) ? idx
[i
] : 0xff;
1399 return ide_device_add_all(idx_all
);
1401 EXPORT_SYMBOL_GPL(ide_device_add
);
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