2 * Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
3 * Copyright (C) 2005, 2007 Bartlomiej Zolnierkiewicz
7 * Mostly written by Mark Lord <mlord@pobox.com>
8 * and Gadi Oxman <gadio@netvision.net.il>
9 * and Andre Hedrick <andre@linux-ide.org>
11 * See linux/MAINTAINERS for address of current maintainer.
13 * This is the IDE probe module, as evolved from hd.c and ide.c.
15 * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
19 #include <linux/module.h>
20 #include <linux/types.h>
21 #include <linux/string.h>
22 #include <linux/kernel.h>
23 #include <linux/timer.h>
25 #include <linux/interrupt.h>
26 #include <linux/major.h>
27 #include <linux/errno.h>
28 #include <linux/genhd.h>
29 #include <linux/slab.h>
30 #include <linux/delay.h>
31 #include <linux/ide.h>
32 #include <linux/spinlock.h>
33 #include <linux/kmod.h>
34 #include <linux/pci.h>
35 #include <linux/scatterlist.h>
37 #include <asm/byteorder.h>
39 #include <asm/uaccess.h>
43 * generic_id - add a generic drive id
44 * @drive: drive to make an ID block for
46 * Add a fake id field to the drive we are passed. This allows
47 * use to skip a ton of NULL checks (which people always miss)
48 * and make drive properties unconditional outside of this file
51 static void generic_id(ide_drive_t
*drive
)
53 drive
->id
->cyls
= drive
->cyl
;
54 drive
->id
->heads
= drive
->head
;
55 drive
->id
->sectors
= drive
->sect
;
56 drive
->id
->cur_cyls
= drive
->cyl
;
57 drive
->id
->cur_heads
= drive
->head
;
58 drive
->id
->cur_sectors
= drive
->sect
;
61 static void ide_disk_init_chs(ide_drive_t
*drive
)
63 struct hd_driveid
*id
= drive
->id
;
65 /* Extract geometry if we did not already have one for the drive */
66 if (!drive
->cyl
|| !drive
->head
|| !drive
->sect
) {
67 drive
->cyl
= drive
->bios_cyl
= id
->cyls
;
68 drive
->head
= drive
->bios_head
= id
->heads
;
69 drive
->sect
= drive
->bios_sect
= id
->sectors
;
72 /* Handle logical geometry translation by the drive */
73 if ((id
->field_valid
& 1) && id
->cur_cyls
&&
74 id
->cur_heads
&& (id
->cur_heads
<= 16) && id
->cur_sectors
) {
75 drive
->cyl
= id
->cur_cyls
;
76 drive
->head
= id
->cur_heads
;
77 drive
->sect
= id
->cur_sectors
;
80 /* Use physical geometry if what we have still makes no sense */
81 if (drive
->head
> 16 && id
->heads
&& id
->heads
<= 16) {
82 drive
->cyl
= id
->cyls
;
83 drive
->head
= id
->heads
;
84 drive
->sect
= id
->sectors
;
88 static void ide_disk_init_mult_count(ide_drive_t
*drive
)
90 struct hd_driveid
*id
= drive
->id
;
92 drive
->mult_count
= 0;
93 if (id
->max_multsect
) {
94 #ifdef CONFIG_IDEDISK_MULTI_MODE
95 id
->multsect
= ((id
->max_multsect
/2) > 1) ? id
->max_multsect
: 0;
96 id
->multsect_valid
= id
->multsect
? 1 : 0;
97 drive
->mult_req
= id
->multsect_valid
? id
->max_multsect
: 0;
98 drive
->special
.b
.set_multmode
= drive
->mult_req
? 1 : 0;
99 #else /* original, pre IDE-NFG, per request of AC */
101 if (drive
->mult_req
> id
->max_multsect
)
102 drive
->mult_req
= id
->max_multsect
;
103 if (drive
->mult_req
|| ((id
->multsect_valid
& 1) && id
->multsect
))
104 drive
->special
.b
.set_multmode
= 1;
110 * do_identify - identify a drive
111 * @drive: drive to identify
114 * Called when we have issued a drive identify command to
115 * read and parse the results. This function is run with
116 * interrupts disabled.
119 static inline void do_identify (ide_drive_t
*drive
, u8 cmd
)
121 ide_hwif_t
*hwif
= HWIF(drive
);
123 struct hd_driveid
*id
;
126 /* read 512 bytes of id info */
127 hwif
->ata_input_data(drive
, id
, SECTOR_WORDS
);
132 printk(KERN_INFO
"%s: dumping identify data\n", drive
->name
);
133 ide_dump_identify((u8
*)id
);
137 #if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
139 * EATA SCSI controllers do a hardware ATA emulation:
140 * Ignore them if there is a driver for them available.
142 if ((id
->model
[0] == 'P' && id
->model
[1] == 'M') ||
143 (id
->model
[0] == 'S' && id
->model
[1] == 'K')) {
144 printk("%s: EATA SCSI HBA %.10s\n", drive
->name
, id
->model
);
147 #endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
150 * WIN_IDENTIFY returns little-endian info,
151 * WIN_PIDENTIFY *usually* returns little-endian info.
153 if (cmd
== WIN_PIDENTIFY
) {
154 if ((id
->model
[0] == 'N' && id
->model
[1] == 'E') /* NEC */
155 || (id
->model
[0] == 'F' && id
->model
[1] == 'X') /* Mitsumi */
156 || (id
->model
[0] == 'P' && id
->model
[1] == 'i'))/* Pioneer */
157 /* Vertos drives may still be weird */
160 ide_fixstring(id
->model
, sizeof(id
->model
), bswap
);
161 ide_fixstring(id
->fw_rev
, sizeof(id
->fw_rev
), bswap
);
162 ide_fixstring(id
->serial_no
, sizeof(id
->serial_no
), bswap
);
164 /* we depend on this a lot! */
165 id
->model
[sizeof(id
->model
)-1] = '\0';
167 if (strstr(id
->model
, "E X A B Y T E N E S T"))
170 printk("%s: %s, ", drive
->name
, id
->model
);
175 * Check for an ATAPI device
177 if (cmd
== WIN_PIDENTIFY
) {
178 u8 type
= (id
->config
>> 8) & 0x1f;
182 if (!strstr(id
->model
, "CD-ROM")) {
183 if (!strstr(id
->model
, "oppy") &&
184 !strstr(id
->model
, "poyp") &&
185 !strstr(id
->model
, "ZIP"))
186 printk("cdrom or floppy?, assuming ");
187 if (drive
->media
!= ide_cdrom
) {
189 drive
->removable
= 1;
193 /* Early cdrom models used zero */
196 drive
->removable
= 1;
198 /* kludge for Apple PowerBook internal zip */
199 if (!strstr(id
->model
, "CD-ROM") &&
200 strstr(id
->model
, "ZIP")) {
206 printk ("CD/DVD-ROM");
213 drive
->removable
= 1;
216 printk("UNKNOWN (type %d)", type
);
221 /* an ATAPI device ignores DRDY */
222 drive
->ready_stat
= 0;
227 * Not an ATAPI device: looks like a "regular" hard disk
231 * 0x848a = CompactFlash device
232 * These are *not* removable in Linux definition of the term
235 if ((id
->config
!= 0x848a) && (id
->config
& (1<<7)))
236 drive
->removable
= 1;
238 drive
->media
= ide_disk
;
239 printk("%s DISK drive\n", (id
->config
== 0x848a) ? "CFA" : "ATA" );
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
) {
358 cookie
= probe_irq_on();
360 ide_set_irq(drive
, autoprobe
);
363 retval
= actual_try_to_identify(drive
, cmd
);
368 ide_set_irq(drive
, 0);
369 /* clear drive IRQ */
370 (void) hwif
->INB(IDE_STATUS_REG
);
372 irq
= probe_irq_off(cookie
);
377 /* Mmmm.. multiple IRQs..
378 * don't know which was ours
380 printk("%s: IRQ probe failed (0x%lx)\n",
381 drive
->name
, cookie
);
388 static int ide_busy_sleep(ide_hwif_t
*hwif
)
390 unsigned long timeout
= jiffies
+ WAIT_WORSTCASE
;
395 stat
= hwif
->INB(hwif
->io_ports
[IDE_STATUS_OFFSET
]);
396 if ((stat
& BUSY_STAT
) == 0)
398 } while (time_before(jiffies
, timeout
));
404 * do_probe - probe an IDE device
405 * @drive: drive to probe
406 * @cmd: command to use
408 * do_probe() has the difficult job of finding a drive if it exists,
409 * without getting hung up if it doesn't exist, without trampling on
410 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
412 * If a drive is "known" to exist (from CMOS or kernel parameters),
413 * but does not respond right away, the probe will "hang in there"
414 * for the maximum wait time (about 30 seconds), otherwise it will
415 * exit much more quickly.
417 * Returns: 0 device was identified
418 * 1 device timed-out (no response to identify request)
419 * 2 device aborted the command (refused to identify itself)
420 * 3 bad status from device (possible for ATAPI drives)
421 * 4 probe was not attempted because failure was obvious
424 static int do_probe (ide_drive_t
*drive
, u8 cmd
)
427 ide_hwif_t
*hwif
= HWIF(drive
);
429 if (drive
->present
) {
430 /* avoid waiting for inappropriate probes */
431 if ((drive
->media
!= ide_disk
) && (cmd
== WIN_IDENTIFY
))
435 printk("probing for %s: present=%d, media=%d, probetype=%s\n",
436 drive
->name
, drive
->present
, drive
->media
,
437 (cmd
== WIN_IDENTIFY
) ? "ATA" : "ATAPI");
440 /* needed for some systems
441 * (e.g. crw9624 as drive0 with disk as slave)
446 if (hwif
->INB(IDE_SELECT_REG
) != drive
->select
.all
&& !drive
->present
) {
447 if (drive
->select
.b
.unit
!= 0) {
448 /* exit with drive0 selected */
449 SELECT_DRIVE(&hwif
->drives
[0]);
450 /* allow BUSY_STAT to assert & clear */
453 /* no i/f present: mmm.. this should be a 4 -ml */
457 if (OK_STAT((hwif
->INB(IDE_STATUS_REG
)), READY_STAT
, BUSY_STAT
) ||
458 drive
->present
|| cmd
== WIN_PIDENTIFY
) {
459 /* send cmd and wait */
460 if ((rc
= try_to_identify(drive
, cmd
))) {
461 /* failed: try again */
462 rc
= try_to_identify(drive
,cmd
);
464 if (hwif
->INB(IDE_STATUS_REG
) == (BUSY_STAT
|READY_STAT
))
467 if ((rc
== 1 && cmd
== WIN_PIDENTIFY
) &&
468 ((drive
->autotune
== IDE_TUNE_DEFAULT
) ||
469 (drive
->autotune
== IDE_TUNE_AUTO
))) {
470 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
);
477 (void)ide_busy_sleep(hwif
);
478 rc
= try_to_identify(drive
, cmd
);
481 printk("%s: no response (status = 0x%02x)\n",
482 drive
->name
, hwif
->INB(IDE_STATUS_REG
));
483 /* ensure drive irq is clear */
484 (void) hwif
->INB(IDE_STATUS_REG
);
486 /* not present or maybe ATAPI */
489 if (drive
->select
.b
.unit
!= 0) {
490 /* exit with drive0 selected */
491 SELECT_DRIVE(&hwif
->drives
[0]);
493 /* ensure drive irq is clear */
494 (void) hwif
->INB(IDE_STATUS_REG
);
502 static void enable_nest (ide_drive_t
*drive
)
504 ide_hwif_t
*hwif
= HWIF(drive
);
506 printk("%s: enabling %s -- ", hwif
->name
, drive
->id
->model
);
509 hwif
->OUTB(EXABYTE_ENABLE_NEST
, IDE_COMMAND_REG
);
511 if (ide_busy_sleep(hwif
)) {
512 printk(KERN_CONT
"failed (timeout)\n");
518 if (!OK_STAT((hwif
->INB(IDE_STATUS_REG
)), 0, BAD_STAT
)) {
519 printk("failed (status = 0x%02x)\n", hwif
->INB(IDE_STATUS_REG
));
524 /* if !(success||timed-out) */
525 if (do_probe(drive
, WIN_IDENTIFY
) >= 2) {
526 /* look for ATAPI device */
527 (void) do_probe(drive
, WIN_PIDENTIFY
);
532 * probe_for_drives - upper level drive probe
533 * @drive: drive to probe for
535 * probe_for_drive() tests for existence of a given drive using do_probe()
536 * and presents things to the user as needed.
538 * Returns: 0 no device was found
539 * 1 device was found (note: drive->present might
543 static inline u8
probe_for_drive (ide_drive_t
*drive
)
546 * In order to keep things simple we have an id
547 * block for all drives at all times. If the device
548 * is pre ATA or refuses ATA/ATAPI identify we
549 * will add faked data to this.
551 * Also note that 0 everywhere means "can't do X"
554 drive
->id
= kzalloc(SECTOR_WORDS
*4, GFP_KERNEL
);
556 if(drive
->id
== NULL
)
558 printk(KERN_ERR
"ide: out of memory for id data.\n");
561 strcpy(drive
->id
->model
, "UNKNOWN");
566 /* if !(success||timed-out) */
567 if (do_probe(drive
, WIN_IDENTIFY
) >= 2) {
568 /* look for ATAPI device */
569 (void) do_probe(drive
, WIN_PIDENTIFY
);
572 /* drive not found */
574 if (strstr(drive
->id
->model
, "E X A B Y T E N E S T"))
577 /* identification failed? */
578 if (!drive
->id_read
) {
579 if (drive
->media
== ide_disk
) {
580 printk(KERN_INFO
"%s: non-IDE drive, CHS=%d/%d/%d\n",
581 drive
->name
, drive
->cyl
,
582 drive
->head
, drive
->sect
);
583 } else if (drive
->media
== ide_cdrom
) {
584 printk(KERN_INFO
"%s: ATAPI cdrom (?)\n", drive
->name
);
587 printk(KERN_WARNING
"%s: Unknown device on bus refused identification. Ignoring.\n", drive
->name
);
591 /* drive was found */
595 /* The drive wasn't being helpful. Add generic info only */
596 if (drive
->id_read
== 0) {
601 if (drive
->media
== ide_disk
) {
602 ide_disk_init_chs(drive
);
603 ide_disk_init_mult_count(drive
);
606 return drive
->present
;
609 static void hwif_release_dev (struct device
*dev
)
611 ide_hwif_t
*hwif
= container_of(dev
, ide_hwif_t
, gendev
);
613 complete(&hwif
->gendev_rel_comp
);
616 static void ide_register_port(ide_hwif_t
*hwif
)
620 /* register with global device tree */
621 strlcpy(hwif
->gendev
.bus_id
,hwif
->name
,BUS_ID_SIZE
);
622 hwif
->gendev
.driver_data
= hwif
;
623 if (hwif
->gendev
.parent
== NULL
) {
625 hwif
->gendev
.parent
= hwif
->dev
;
627 /* Would like to do = &device_legacy */
628 hwif
->gendev
.parent
= NULL
;
630 hwif
->gendev
.release
= hwif_release_dev
;
631 ret
= device_register(&hwif
->gendev
);
633 printk(KERN_WARNING
"IDE: %s: device_register error: %d\n",
638 * ide_port_wait_ready - wait for port to become ready
641 * This is needed on some PPCs and a bunch of BIOS-less embedded
642 * platforms. Typical cases are:
644 * - The firmware hard reset the disk before booting the kernel,
645 * the drive is still doing it's poweron-reset sequence, that
646 * can take up to 30 seconds.
648 * - The firmware does nothing (or no firmware), the device is
649 * still in POST state (same as above actually).
651 * - Some CD/DVD/Writer combo drives tend to drive the bus during
652 * their reset sequence even when they are non-selected slave
653 * devices, thus preventing discovery of the main HD.
655 * Doing this wait-for-non-busy should not harm any existing
656 * configuration and fix some issues like the above.
660 * Returns 0 on success, error code (< 0) otherwise.
663 static int ide_port_wait_ready(ide_hwif_t
*hwif
)
667 printk(KERN_DEBUG
"Probing IDE interface %s...\n", hwif
->name
);
669 /* Let HW settle down a bit from whatever init state we
673 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
674 * I know of at least one disk who takes 31 seconds, I use 35
677 rc
= ide_wait_not_busy(hwif
, 35000);
681 /* Now make sure both master & slave are ready */
682 for (unit
= 0; unit
< MAX_DRIVES
; unit
++) {
683 ide_drive_t
*drive
= &hwif
->drives
[unit
];
685 /* Ignore disks that we will not probe for later. */
686 if (!drive
->noprobe
|| drive
->present
) {
688 ide_set_irq(drive
, 1);
690 rc
= ide_wait_not_busy(hwif
, 35000);
694 printk(KERN_DEBUG
"%s: ide_wait_not_busy() skipped\n",
698 /* Exit function with master reselected (let's be sane) */
700 SELECT_DRIVE(&hwif
->drives
[0]);
706 * ide_undecoded_slave - look for bad CF adapters
709 * Analyse the drives on the interface and attempt to decide if we
710 * have the same drive viewed twice. This occurs with crap CF adapters
711 * and PCMCIA sometimes.
714 void ide_undecoded_slave(ide_drive_t
*drive1
)
716 ide_drive_t
*drive0
= &drive1
->hwif
->drives
[0];
718 if ((drive1
->dn
& 1) == 0 || drive0
->present
== 0)
721 /* If the models don't match they are not the same product */
722 if (strcmp(drive0
->id
->model
, drive1
->id
->model
))
725 /* Serial numbers do not match */
726 if (strncmp(drive0
->id
->serial_no
, drive1
->id
->serial_no
, 20))
729 /* No serial number, thankfully very rare for CF */
730 if (drive0
->id
->serial_no
[0] == 0)
733 /* Appears to be an IDE flash adapter with decode bugs */
734 printk(KERN_WARNING
"ide-probe: ignoring undecoded slave\n");
739 EXPORT_SYMBOL_GPL(ide_undecoded_slave
);
741 static int ide_probe_port(ide_hwif_t
*hwif
)
745 int unit
, rc
= -ENODEV
;
747 BUG_ON(hwif
->present
);
753 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
754 * we'll install our IRQ driver much later...
758 disable_irq(hwif
->irq
);
760 local_irq_set(flags
);
762 if (ide_port_wait_ready(hwif
) == -EBUSY
)
763 printk(KERN_DEBUG
"%s: Wait for ready failed before probe !\n", hwif
->name
);
766 * Need to probe slave device first to make it release PDIAG-.
768 for (unit
= MAX_DRIVES
- 1; unit
>= 0; unit
--) {
769 ide_drive_t
*drive
= &hwif
->drives
[unit
];
770 drive
->dn
= (hwif
->channel
? 2 : 0) + unit
;
771 (void) probe_for_drive(drive
);
775 if (hwif
->io_ports
[IDE_CONTROL_OFFSET
] && hwif
->reset
) {
776 printk(KERN_WARNING
"%s: reset\n", hwif
->name
);
777 hwif
->OUTB(12, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
779 hwif
->OUTB(8, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
780 (void)ide_busy_sleep(hwif
);
782 local_irq_restore(flags
);
784 * Use cached IRQ number. It might be (and is...) changed by probe
793 static void ide_port_tune_devices(ide_hwif_t
*hwif
)
797 for (unit
= 0; unit
< MAX_DRIVES
; unit
++) {
798 ide_drive_t
*drive
= &hwif
->drives
[unit
];
800 if (drive
->present
&& hwif
->quirkproc
)
801 hwif
->quirkproc(drive
);
804 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
805 ide_drive_t
*drive
= &hwif
->drives
[unit
];
807 if (drive
->present
) {
808 if (drive
->autotune
== IDE_TUNE_AUTO
)
809 ide_set_max_pio(drive
);
811 if (drive
->autotune
!= IDE_TUNE_DEFAULT
&&
812 drive
->autotune
!= IDE_TUNE_AUTO
)
817 if (hwif
->dma_host_set
)
822 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
823 ide_drive_t
*drive
= &hwif
->drives
[unit
];
825 if (hwif
->host_flags
& IDE_HFLAG_NO_IO_32BIT
)
826 drive
->no_io_32bit
= 1;
828 drive
->no_io_32bit
= drive
->id
->dword_io
? 1 : 0;
834 * save_match() is used to simplify logic in init_irq() below.
836 * A loophole here is that we may not know about a particular
837 * hwif's irq until after that hwif is actually probed/initialized..
838 * This could be a problem for the case where an hwif is on a
839 * dual interface that requires serialization (eg. cmd640) and another
840 * hwif using one of the same irqs is initialized beforehand.
842 * This routine detects and reports such situations, but does not fix them.
844 static void save_match(ide_hwif_t
*hwif
, ide_hwif_t
*new, ide_hwif_t
**match
)
846 ide_hwif_t
*m
= *match
;
848 if (m
&& m
->hwgroup
&& m
->hwgroup
!= new->hwgroup
) {
851 printk("%s: potential irq problem with %s and %s\n",
852 hwif
->name
, new->name
, m
->name
);
854 if (!m
|| m
->irq
!= hwif
->irq
) /* don't undo a prior perfect match */
857 #endif /* MAX_HWIFS > 1 */
862 static int ide_init_queue(ide_drive_t
*drive
)
864 struct request_queue
*q
;
865 ide_hwif_t
*hwif
= HWIF(drive
);
866 int max_sectors
= 256;
867 int max_sg_entries
= PRD_ENTRIES
;
870 * Our default set up assumes the normal IDE case,
871 * that is 64K segmenting, standard PRD setup
872 * and LBA28. Some drivers then impose their own
873 * limits and LBA48 we could raise it but as yet
877 q
= blk_init_queue_node(do_ide_request
, &ide_lock
, hwif_to_node(hwif
));
881 q
->queuedata
= drive
;
882 blk_queue_segment_boundary(q
, 0xffff);
884 if (hwif
->rqsize
< max_sectors
)
885 max_sectors
= hwif
->rqsize
;
886 blk_queue_max_sectors(q
, max_sectors
);
889 /* When we have an IOMMU, we may have a problem where pci_map_sg()
890 * creates segments that don't completely match our boundary
891 * requirements and thus need to be broken up again. Because it
892 * doesn't align properly either, we may actually have to break up
893 * to more segments than what was we got in the first place, a max
894 * worst case is twice as many.
895 * This will be fixed once we teach pci_map_sg() about our boundary
896 * requirements, hopefully soon. *FIXME*
898 if (!PCI_DMA_BUS_IS_PHYS
)
899 max_sg_entries
>>= 1;
900 #endif /* CONFIG_PCI */
902 blk_queue_max_hw_segments(q
, max_sg_entries
);
903 blk_queue_max_phys_segments(q
, max_sg_entries
);
905 /* assign drive queue */
908 /* needs drive->queue to be set */
909 ide_toggle_bounce(drive
, 1);
914 static void ide_add_drive_to_hwgroup(ide_drive_t
*drive
)
916 ide_hwgroup_t
*hwgroup
= drive
->hwif
->hwgroup
;
918 spin_lock_irq(&ide_lock
);
919 if (!hwgroup
->drive
) {
920 /* first drive for hwgroup. */
922 hwgroup
->drive
= drive
;
923 hwgroup
->hwif
= HWIF(hwgroup
->drive
);
925 drive
->next
= hwgroup
->drive
->next
;
926 hwgroup
->drive
->next
= drive
;
928 spin_unlock_irq(&ide_lock
);
932 * This routine sets up the irq for an ide interface, and creates a new
933 * hwgroup for the irq/hwif if none was previously assigned.
935 * Much of the code is for correctly detecting/handling irq sharing
936 * and irq serialization situations. This is somewhat complex because
937 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
939 static int init_irq (ide_hwif_t
*hwif
)
942 ide_hwgroup_t
*hwgroup
;
943 ide_hwif_t
*match
= NULL
;
946 BUG_ON(in_interrupt());
947 BUG_ON(irqs_disabled());
948 BUG_ON(hwif
== NULL
);
950 mutex_lock(&ide_cfg_mtx
);
951 hwif
->hwgroup
= NULL
;
954 * Group up with any other hwifs that share our irq(s).
956 for (index
= 0; index
< MAX_HWIFS
; index
++) {
957 ide_hwif_t
*h
= &ide_hwifs
[index
];
958 if (h
->hwgroup
) { /* scan only initialized hwif's */
959 if (hwif
->irq
== h
->irq
) {
960 hwif
->sharing_irq
= h
->sharing_irq
= 1;
961 if (hwif
->chipset
!= ide_pci
||
962 h
->chipset
!= ide_pci
) {
963 save_match(hwif
, h
, &match
);
966 if (hwif
->serialized
) {
967 if (hwif
->mate
&& hwif
->mate
->irq
== h
->irq
)
968 save_match(hwif
, h
, &match
);
971 if (h
->mate
&& hwif
->irq
== h
->mate
->irq
)
972 save_match(hwif
, h
, &match
);
976 #endif /* MAX_HWIFS > 1 */
978 * If we are still without a hwgroup, then form a new one
981 hwgroup
= match
->hwgroup
;
982 hwif
->hwgroup
= hwgroup
;
984 * Link us into the hwgroup.
985 * This must be done early, do ensure that unexpected_intr
986 * can find the hwif and prevent irq storms.
987 * No drives are attached to the new hwif, choose_drive
988 * can't do anything stupid (yet).
989 * Add ourself as the 2nd entry to the hwgroup->hwif
990 * linked list, the first entry is the hwif that owns
991 * hwgroup->handler - do not change that.
993 spin_lock_irq(&ide_lock
);
994 hwif
->next
= hwgroup
->hwif
->next
;
995 hwgroup
->hwif
->next
= hwif
;
996 BUG_ON(hwif
->next
== hwif
);
997 spin_unlock_irq(&ide_lock
);
999 hwgroup
= kmalloc_node(sizeof(*hwgroup
), GFP_KERNEL
|__GFP_ZERO
,
1000 hwif_to_node(hwif
));
1001 if (hwgroup
== NULL
)
1004 hwif
->hwgroup
= hwgroup
;
1005 hwgroup
->hwif
= hwif
->next
= hwif
;
1007 init_timer(&hwgroup
->timer
);
1008 hwgroup
->timer
.function
= &ide_timer_expiry
;
1009 hwgroup
->timer
.data
= (unsigned long) hwgroup
;
1013 * Allocate the irq, if not already obtained for another hwif
1015 if (!match
|| match
->irq
!= hwif
->irq
) {
1017 #if defined(__mc68000__) || defined(CONFIG_APUS)
1019 #endif /* __mc68000__ || CONFIG_APUS */
1021 if (IDE_CHIPSET_IS_PCI(hwif
->chipset
))
1024 if (hwif
->io_ports
[IDE_CONTROL_OFFSET
])
1026 hwif
->OUTB(0x08, hwif
->io_ports
[IDE_CONTROL_OFFSET
]);
1028 if (request_irq(hwif
->irq
,&ide_intr
,sa
,hwif
->name
,hwgroup
))
1032 if (!hwif
->rqsize
) {
1033 if ((hwif
->host_flags
& IDE_HFLAG_NO_LBA48
) ||
1034 (hwif
->host_flags
& IDE_HFLAG_NO_LBA48_DMA
))
1037 hwif
->rqsize
= 65536;
1041 * For any present drive:
1042 * - allocate the block device queue
1043 * - link drive into the hwgroup
1045 for (index
= 0; index
< MAX_DRIVES
; ++index
) {
1046 ide_drive_t
*drive
= &hwif
->drives
[index
];
1047 if (!drive
->present
)
1049 if (ide_init_queue(drive
)) {
1050 printk(KERN_ERR
"ide: failed to init %s\n",drive
->name
);
1053 ide_add_drive_to_hwgroup(drive
);
1056 #if !defined(__mc68000__) && !defined(CONFIG_APUS)
1057 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif
->name
,
1058 hwif
->io_ports
[IDE_DATA_OFFSET
],
1059 hwif
->io_ports
[IDE_DATA_OFFSET
]+7,
1060 hwif
->io_ports
[IDE_CONTROL_OFFSET
], hwif
->irq
);
1062 printk("%s at 0x%08lx on irq %d", hwif
->name
,
1063 hwif
->io_ports
[IDE_DATA_OFFSET
], hwif
->irq
);
1064 #endif /* __mc68000__ && CONFIG_APUS */
1066 printk(" (%sed with %s)",
1067 hwif
->sharing_irq
? "shar" : "serializ", match
->name
);
1069 mutex_unlock(&ide_cfg_mtx
);
1072 ide_remove_port_from_hwgroup(hwif
);
1074 mutex_unlock(&ide_cfg_mtx
);
1078 static int ata_lock(dev_t dev
, void *data
)
1080 /* FIXME: we want to pin hwif down */
1084 static struct kobject
*ata_probe(dev_t dev
, int *part
, void *data
)
1086 ide_hwif_t
*hwif
= data
;
1087 int unit
= *part
>> PARTN_BITS
;
1088 ide_drive_t
*drive
= &hwif
->drives
[unit
];
1089 if (!drive
->present
)
1092 if (drive
->media
== ide_disk
)
1093 request_module("ide-disk");
1095 request_module("ide-scsi");
1096 if (drive
->media
== ide_cdrom
|| drive
->media
== ide_optical
)
1097 request_module("ide-cd");
1098 if (drive
->media
== ide_tape
)
1099 request_module("ide-tape");
1100 if (drive
->media
== ide_floppy
)
1101 request_module("ide-floppy");
1106 static struct kobject
*exact_match(dev_t dev
, int *part
, void *data
)
1108 struct gendisk
*p
= data
;
1109 *part
&= (1 << PARTN_BITS
) - 1;
1110 return &p
->dev
.kobj
;
1113 static int exact_lock(dev_t dev
, void *data
)
1115 struct gendisk
*p
= data
;
1122 void ide_register_region(struct gendisk
*disk
)
1124 blk_register_region(MKDEV(disk
->major
, disk
->first_minor
),
1125 disk
->minors
, NULL
, exact_match
, exact_lock
, disk
);
1128 EXPORT_SYMBOL_GPL(ide_register_region
);
1130 void ide_unregister_region(struct gendisk
*disk
)
1132 blk_unregister_region(MKDEV(disk
->major
, disk
->first_minor
),
1136 EXPORT_SYMBOL_GPL(ide_unregister_region
);
1138 void ide_init_disk(struct gendisk
*disk
, ide_drive_t
*drive
)
1140 ide_hwif_t
*hwif
= drive
->hwif
;
1141 unsigned int unit
= (drive
->select
.all
>> 4) & 1;
1143 disk
->major
= hwif
->major
;
1144 disk
->first_minor
= unit
<< PARTN_BITS
;
1145 sprintf(disk
->disk_name
, "hd%c", 'a' + hwif
->index
* MAX_DRIVES
+ unit
);
1146 disk
->queue
= drive
->queue
;
1149 EXPORT_SYMBOL_GPL(ide_init_disk
);
1151 static void ide_remove_drive_from_hwgroup(ide_drive_t
*drive
)
1153 ide_hwgroup_t
*hwgroup
= drive
->hwif
->hwgroup
;
1155 if (drive
== drive
->next
) {
1156 /* special case: last drive from hwgroup. */
1157 BUG_ON(hwgroup
->drive
!= drive
);
1158 hwgroup
->drive
= NULL
;
1162 walk
= hwgroup
->drive
;
1163 while (walk
->next
!= drive
)
1165 walk
->next
= drive
->next
;
1166 if (hwgroup
->drive
== drive
) {
1167 hwgroup
->drive
= drive
->next
;
1168 hwgroup
->hwif
= hwgroup
->drive
->hwif
;
1171 BUG_ON(hwgroup
->drive
== drive
);
1174 static void drive_release_dev (struct device
*dev
)
1176 ide_drive_t
*drive
= container_of(dev
, ide_drive_t
, gendev
);
1178 spin_lock_irq(&ide_lock
);
1179 ide_remove_drive_from_hwgroup(drive
);
1183 /* Messed up locking ... */
1184 spin_unlock_irq(&ide_lock
);
1185 blk_cleanup_queue(drive
->queue
);
1186 spin_lock_irq(&ide_lock
);
1187 drive
->queue
= NULL
;
1188 spin_unlock_irq(&ide_lock
);
1190 complete(&drive
->gendev_rel_comp
);
1193 static int hwif_init(ide_hwif_t
*hwif
)
1198 if (!(hwif
->irq
= ide_default_irq(hwif
->io_ports
[IDE_DATA_OFFSET
])))
1200 printk("%s: DISABLED, NO IRQ\n", hwif
->name
);
1204 #ifdef CONFIG_BLK_DEV_HD
1205 if (hwif
->irq
== HD_IRQ
&& hwif
->io_ports
[IDE_DATA_OFFSET
] != HD_DATA
) {
1206 printk("%s: CANNOT SHARE IRQ WITH OLD "
1207 "HARDDISK DRIVER (hd.c)\n", hwif
->name
);
1210 #endif /* CONFIG_BLK_DEV_HD */
1212 if (register_blkdev(hwif
->major
, hwif
->name
))
1215 if (!hwif
->sg_max_nents
)
1216 hwif
->sg_max_nents
= PRD_ENTRIES
;
1218 hwif
->sg_table
= kmalloc(sizeof(struct scatterlist
)*hwif
->sg_max_nents
,
1220 if (!hwif
->sg_table
) {
1221 printk(KERN_ERR
"%s: unable to allocate SG table.\n", hwif
->name
);
1225 sg_init_table(hwif
->sg_table
, hwif
->sg_max_nents
);
1227 if (init_irq(hwif
) == 0)
1230 old_irq
= hwif
->irq
;
1232 * It failed to initialise. Find the default IRQ for
1233 * this port and try that.
1235 if (!(hwif
->irq
= ide_default_irq(hwif
->io_ports
[IDE_DATA_OFFSET
]))) {
1236 printk("%s: Disabled unable to get IRQ %d.\n",
1237 hwif
->name
, old_irq
);
1240 if (init_irq(hwif
)) {
1241 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1242 hwif
->name
, old_irq
, hwif
->irq
);
1245 printk("%s: probed IRQ %d failed, using default.\n",
1246 hwif
->name
, hwif
->irq
);
1249 blk_register_region(MKDEV(hwif
->major
, 0), MAX_DRIVES
<< PARTN_BITS
,
1250 THIS_MODULE
, ata_probe
, ata_lock
, hwif
);
1251 ide_acpi_init(hwif
);
1255 unregister_blkdev(hwif
->major
, hwif
->name
);
1259 static void hwif_register_devices(ide_hwif_t
*hwif
)
1263 for (i
= 0; i
< MAX_DRIVES
; i
++) {
1264 ide_drive_t
*drive
= &hwif
->drives
[i
];
1265 struct device
*dev
= &drive
->gendev
;
1268 if (!drive
->present
)
1271 ide_add_generic_settings(drive
);
1273 snprintf(dev
->bus_id
, BUS_ID_SIZE
, "%u.%u", hwif
->index
, i
);
1274 dev
->parent
= &hwif
->gendev
;
1275 dev
->bus
= &ide_bus_type
;
1276 dev
->driver_data
= drive
;
1277 dev
->release
= drive_release_dev
;
1279 ret
= device_register(dev
);
1281 printk(KERN_WARNING
"IDE: %s: device_register error: "
1282 "%d\n", __func__
, ret
);
1286 static void ide_port_init_devices(ide_hwif_t
*hwif
)
1290 for (i
= 0; i
< MAX_DRIVES
; i
++) {
1291 ide_drive_t
*drive
= &hwif
->drives
[i
];
1293 if (hwif
->host_flags
& IDE_HFLAG_IO_32BIT
)
1294 drive
->io_32bit
= 1;
1295 if (hwif
->host_flags
& IDE_HFLAG_UNMASK_IRQS
)
1297 if (hwif
->host_flags
& IDE_HFLAG_NO_UNMASK_IRQS
)
1298 drive
->no_unmask
= 1;
1299 if ((hwif
->host_flags
& IDE_HFLAG_NO_AUTOTUNE
) == 0)
1300 drive
->autotune
= 1;
1303 if (hwif
->port_init_devs
)
1304 hwif
->port_init_devs(hwif
);
1307 static void ide_init_port(ide_hwif_t
*hwif
, unsigned int port
,
1308 const struct ide_port_info
*d
)
1310 if (d
->chipset
!= ide_etrax100
)
1311 hwif
->channel
= port
;
1314 hwif
->chipset
= d
->chipset
;
1319 if ((d
->host_flags
& IDE_HFLAG_NO_DMA
) == 0)
1320 ide_hwif_setup_dma(hwif
, d
);
1322 if ((!hwif
->irq
&& (d
->host_flags
& IDE_HFLAG_LEGACY_IRQS
)) ||
1323 (d
->host_flags
& IDE_HFLAG_FORCE_LEGACY_IRQS
))
1324 hwif
->irq
= port
? 15 : 14;
1326 hwif
->host_flags
= d
->host_flags
;
1327 hwif
->pio_mask
= d
->pio_mask
;
1329 if ((d
->host_flags
& IDE_HFLAG_SERIALIZE
) && hwif
->mate
)
1330 hwif
->mate
->serialized
= hwif
->serialized
= 1;
1332 hwif
->swdma_mask
= d
->swdma_mask
;
1333 hwif
->mwdma_mask
= d
->mwdma_mask
;
1334 hwif
->ultra_mask
= d
->udma_mask
;
1336 /* reset DMA masks only for SFF-style DMA controllers */
1337 if ((d
->host_flags
&& IDE_HFLAG_NO_DMA
) == 0 && hwif
->dma_base
== 0)
1338 hwif
->swdma_mask
= hwif
->mwdma_mask
= hwif
->ultra_mask
= 0;
1340 if (d
->host_flags
& IDE_HFLAG_RQSIZE_256
)
1343 /* call chipset specific routine for each enabled port */
1347 if (hwif
->cable_detect
&& (hwif
->ultra_mask
& 0x78)) {
1348 if (hwif
->cbl
!= ATA_CBL_PATA40_SHORT
)
1349 hwif
->cbl
= hwif
->cable_detect(hwif
);
1353 int ide_device_add_all(u8
*idx
, const struct ide_port_info
*d
)
1355 ide_hwif_t
*hwif
, *mate
= NULL
;
1358 for (i
= 0; i
< MAX_HWIFS
; i
++) {
1359 if (d
== NULL
|| idx
[i
] == 0xff) {
1364 hwif
= &ide_hwifs
[idx
[i
]];
1366 if (d
->chipset
!= ide_etrax100
&& (i
& 1) && mate
) {
1371 mate
= (i
& 1) ? NULL
: hwif
;
1373 ide_init_port(hwif
, i
& 1, d
);
1374 ide_port_init_devices(hwif
);
1377 for (i
= 0; i
< MAX_HWIFS
; i
++) {
1381 hwif
= &ide_hwifs
[idx
[i
]];
1383 if ((hwif
->chipset
!= ide_4drives
|| !hwif
->mate
||
1384 !hwif
->mate
->present
) && ide_hwif_request_regions(hwif
)) {
1385 printk(KERN_ERR
"%s: ports already in use, "
1386 "skipping probe\n", hwif
->name
);
1390 if (ide_probe_port(hwif
) < 0) {
1391 ide_hwif_release_regions(hwif
);
1397 if (hwif
->chipset
!= ide_4drives
|| !hwif
->mate
||
1398 !hwif
->mate
->present
)
1399 ide_register_port(hwif
);
1401 ide_port_tune_devices(hwif
);
1404 for (i
= 0; i
< MAX_HWIFS
; i
++) {
1408 hwif
= &ide_hwifs
[idx
[i
]];
1413 if (hwif_init(hwif
) == 0) {
1414 printk(KERN_INFO
"%s: failed to initialize IDE "
1415 "interface\n", hwif
->name
);
1422 for (i
= 0; i
< MAX_HWIFS
; i
++) {
1426 hwif
= &ide_hwifs
[idx
[i
]];
1428 if (hwif
->present
) {
1429 if (hwif
->chipset
== ide_unknown
||
1430 hwif
->chipset
== ide_forced
)
1431 hwif
->chipset
= ide_generic
;
1432 hwif_register_devices(hwif
);
1436 for (i
= 0; i
< MAX_HWIFS
; i
++) {
1438 ide_proc_register_port(&ide_hwifs
[idx
[i
]]);
1443 EXPORT_SYMBOL_GPL(ide_device_add_all
);
1445 int ide_device_add(u8 idx
[4], const struct ide_port_info
*d
)
1447 u8 idx_all
[MAX_HWIFS
];
1450 for (i
= 0; i
< MAX_HWIFS
; i
++)
1451 idx_all
[i
] = (i
< 4) ? idx
[i
] : 0xff;
1453 return ide_device_add_all(idx_all
, d
);
1455 EXPORT_SYMBOL_GPL(ide_device_add
);