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
)
55 id
[ATA_ID_CUR_CYLS
] = id
[ATA_ID_CYLS
] = drive
->cyl
;
56 id
[ATA_ID_CUR_HEADS
] = id
[ATA_ID_HEADS
] = drive
->head
;
57 id
[ATA_ID_CUR_SECTORS
] = id
[ATA_ID_SECTORS
] = drive
->sect
;
60 static void ide_disk_init_chs(ide_drive_t
*drive
)
64 /* Extract geometry if we did not already have one for the drive */
65 if (!drive
->cyl
|| !drive
->head
|| !drive
->sect
) {
66 drive
->cyl
= drive
->bios_cyl
= id
[ATA_ID_CYLS
];
67 drive
->head
= drive
->bios_head
= id
[ATA_ID_HEADS
];
68 drive
->sect
= drive
->bios_sect
= id
[ATA_ID_SECTORS
];
71 /* Handle logical geometry translation by the drive */
72 if (ata_id_current_chs_valid(id
)) {
73 drive
->cyl
= id
[ATA_ID_CUR_CYLS
];
74 drive
->head
= id
[ATA_ID_CUR_HEADS
];
75 drive
->sect
= id
[ATA_ID_CUR_SECTORS
];
78 /* Use physical geometry if what we have still makes no sense */
79 if (drive
->head
> 16 && id
[ATA_ID_HEADS
] && id
[ATA_ID_HEADS
] <= 16) {
80 drive
->cyl
= id
[ATA_ID_CYLS
];
81 drive
->head
= id
[ATA_ID_HEADS
];
82 drive
->sect
= id
[ATA_ID_SECTORS
];
86 static void ide_disk_init_mult_count(ide_drive_t
*drive
)
89 u8 max_multsect
= id
[ATA_ID_MAX_MULTSECT
] & 0xff;
92 if ((max_multsect
/ 2) > 1)
93 id
[ATA_ID_MULTSECT
] = max_multsect
| 0x100;
95 id
[ATA_ID_MULTSECT
] &= ~0x1ff;
97 drive
->mult_req
= id
[ATA_ID_MULTSECT
] & 0xff;
100 drive
->special
.b
.set_multmode
= 1;
104 static void ide_classify_ata_dev(ide_drive_t
*drive
)
107 char *m
= (char *)&id
[ATA_ID_PROD
];
108 int is_cfa
= ata_id_is_cfa(id
);
110 /* CF devices are *not* removable in Linux definition of the term */
111 if (is_cfa
== 0 && (id
[ATA_ID_CONFIG
] & (1 << 7)))
112 drive
->dev_flags
|= IDE_DFLAG_REMOVABLE
;
114 drive
->media
= ide_disk
;
116 if (!ata_id_has_unload(drive
->id
))
117 drive
->dev_flags
|= IDE_DFLAG_NO_UNLOAD
;
119 printk(KERN_INFO
"%s: %s, %s DISK drive\n", drive
->name
, m
,
120 is_cfa
? "CFA" : "ATA");
123 static void ide_classify_atapi_dev(ide_drive_t
*drive
)
126 char *m
= (char *)&id
[ATA_ID_PROD
];
127 u8 type
= (id
[ATA_ID_CONFIG
] >> 8) & 0x1f;
129 printk(KERN_INFO
"%s: %s, ATAPI ", drive
->name
, m
);
132 if (!strstr(m
, "CD-ROM")) {
133 if (!strstr(m
, "oppy") &&
134 !strstr(m
, "poyp") &&
136 printk(KERN_CONT
"cdrom or floppy?, assuming ");
137 if (drive
->media
!= ide_cdrom
) {
138 printk(KERN_CONT
"FLOPPY");
139 drive
->dev_flags
|= IDE_DFLAG_REMOVABLE
;
143 /* Early cdrom models used zero */
146 drive
->dev_flags
|= IDE_DFLAG_REMOVABLE
;
148 /* kludge for Apple PowerBook internal zip */
149 if (!strstr(m
, "CD-ROM") && strstr(m
, "ZIP")) {
150 printk(KERN_CONT
"FLOPPY");
155 printk(KERN_CONT
"CD/DVD-ROM");
158 printk(KERN_CONT
"TAPE");
161 printk(KERN_CONT
"OPTICAL");
162 drive
->dev_flags
|= IDE_DFLAG_REMOVABLE
;
165 printk(KERN_CONT
"UNKNOWN (type %d)", type
);
169 printk(KERN_CONT
" drive\n");
171 /* an ATAPI device ignores DRDY */
172 drive
->ready_stat
= 0;
173 if (ata_id_cdb_intr(id
))
174 drive
->atapi_flags
|= IDE_AFLAG_DRQ_INTERRUPT
;
175 drive
->dev_flags
|= IDE_DFLAG_DOORLOCKING
;
176 /* we don't do head unloading on ATAPI devices */
177 drive
->dev_flags
|= IDE_DFLAG_NO_UNLOAD
;
181 * do_identify - identify a drive
182 * @drive: drive to identify
185 * Called when we have issued a drive identify command to
186 * read and parse the results. This function is run with
187 * interrupts disabled.
190 static void do_identify(ide_drive_t
*drive
, u8 cmd
)
192 ide_hwif_t
*hwif
= drive
->hwif
;
194 char *m
= (char *)&id
[ATA_ID_PROD
];
198 /* local CPU only; some systems need this */
199 local_irq_save(flags
);
200 /* read 512 bytes of id info */
201 hwif
->tp_ops
->input_data(drive
, NULL
, id
, SECTOR_SIZE
);
202 local_irq_restore(flags
);
204 drive
->dev_flags
|= IDE_DFLAG_ID_READ
;
206 printk(KERN_INFO
"%s: dumping identify data\n", drive
->name
);
207 ide_dump_identify((u8
*)id
);
212 * ATA_CMD_ID_ATA returns little-endian info,
213 * ATA_CMD_ID_ATAPI *usually* returns little-endian info.
215 if (cmd
== ATA_CMD_ID_ATAPI
) {
216 if ((m
[0] == 'N' && m
[1] == 'E') || /* NEC */
217 (m
[0] == 'F' && m
[1] == 'X') || /* Mitsumi */
218 (m
[0] == 'P' && m
[1] == 'i')) /* Pioneer */
219 /* Vertos drives may still be weird */
223 ide_fixstring(m
, ATA_ID_PROD_LEN
, bswap
);
224 ide_fixstring((char *)&id
[ATA_ID_FW_REV
], ATA_ID_FW_REV_LEN
, bswap
);
225 ide_fixstring((char *)&id
[ATA_ID_SERNO
], ATA_ID_SERNO_LEN
, bswap
);
227 /* we depend on this a lot! */
228 m
[ATA_ID_PROD_LEN
- 1] = '\0';
230 if (strstr(m
, "E X A B Y T E N E S T"))
233 drive
->dev_flags
|= IDE_DFLAG_PRESENT
;
234 drive
->dev_flags
&= ~IDE_DFLAG_DEAD
;
239 drive
->dev_flags
&= ~IDE_DFLAG_PRESENT
;
243 * try_to_identify - send ATA/ATAPI identify
244 * @drive: drive to identify
245 * @cmd: command to use
247 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
248 * and waits for a response.
250 * Returns: 0 device was identified
251 * 1 device timed-out (no response to identify request)
252 * 2 device aborted the command (refused to identify itself)
255 static int try_to_identify(ide_drive_t
*drive
, u8 cmd
)
257 ide_hwif_t
*hwif
= drive
->hwif
;
258 struct ide_io_ports
*io_ports
= &hwif
->io_ports
;
259 const struct ide_tp_ops
*tp_ops
= hwif
->tp_ops
;
260 int use_altstatus
= 0, rc
;
261 unsigned long timeout
;
265 * Disable device IRQ. Otherwise we'll get spurious interrupts
266 * during the identify phase that the IRQ handler isn't expecting.
268 if (io_ports
->ctl_addr
)
269 tp_ops
->set_irq(hwif
, 0);
271 /* take a deep breath */
274 if (io_ports
->ctl_addr
&&
275 (hwif
->host_flags
& IDE_HFLAG_BROKEN_ALTSTATUS
) == 0) {
276 a
= tp_ops
->read_altstatus(hwif
);
277 s
= tp_ops
->read_status(hwif
);
278 if ((a
^ s
) & ~ATA_IDX
)
279 /* ancient Seagate drives, broken interfaces */
280 printk(KERN_INFO
"%s: probing with STATUS(0x%02x) "
281 "instead of ALTSTATUS(0x%02x)\n",
284 /* use non-intrusive polling */
288 /* set features register for atapi
289 * identify command to be sure of reply
291 if (cmd
== ATA_CMD_ID_ATAPI
) {
294 memset(&task
, 0, sizeof(task
));
295 /* disable DMA & overlap */
296 task
.tf_flags
= IDE_TFLAG_OUT_FEATURE
;
298 tp_ops
->tf_load(drive
, &task
);
301 /* ask drive for ID */
302 tp_ops
->exec_command(hwif
, cmd
);
304 timeout
= ((cmd
== ATA_CMD_ID_ATA
) ? WAIT_WORSTCASE
: WAIT_PIDENTIFY
) / 2;
306 if (ide_busy_sleep(hwif
, timeout
, use_altstatus
))
309 /* wait for IRQ and ATA_DRQ */
311 s
= tp_ops
->read_status(hwif
);
313 if (OK_STAT(s
, ATA_DRQ
, BAD_R_STAT
)) {
314 /* drive returned ID */
315 do_identify(drive
, cmd
);
316 /* drive responded with ID */
318 /* clear drive IRQ */
319 (void)tp_ops
->read_status(hwif
);
321 /* drive refused ID */
327 int ide_busy_sleep(ide_hwif_t
*hwif
, unsigned long timeout
, int altstatus
)
334 msleep(50); /* give drive a breather */
335 stat
= altstatus
? hwif
->tp_ops
->read_altstatus(hwif
)
336 : hwif
->tp_ops
->read_status(hwif
);
337 if ((stat
& ATA_BUSY
) == 0)
339 } while (time_before(jiffies
, timeout
));
341 return 1; /* drive timed-out */
344 static u8
ide_read_device(ide_drive_t
*drive
)
348 memset(&task
, 0, sizeof(task
));
349 task
.tf_flags
= IDE_TFLAG_IN_DEVICE
;
351 drive
->hwif
->tp_ops
->tf_read(drive
, &task
);
353 return task
.tf
.device
;
357 * do_probe - probe an IDE device
358 * @drive: drive to probe
359 * @cmd: command to use
361 * do_probe() has the difficult job of finding a drive if it exists,
362 * without getting hung up if it doesn't exist, without trampling on
363 * ethernet cards, and without leaving any IRQs dangling to haunt us later.
365 * If a drive is "known" to exist (from CMOS or kernel parameters),
366 * but does not respond right away, the probe will "hang in there"
367 * for the maximum wait time (about 30 seconds), otherwise it will
368 * exit much more quickly.
370 * Returns: 0 device was identified
371 * 1 device timed-out (no response to identify request)
372 * 2 device aborted the command (refused to identify itself)
373 * 3 bad status from device (possible for ATAPI drives)
374 * 4 probe was not attempted because failure was obvious
377 static int do_probe (ide_drive_t
*drive
, u8 cmd
)
379 ide_hwif_t
*hwif
= drive
->hwif
;
380 const struct ide_tp_ops
*tp_ops
= hwif
->tp_ops
;
382 u8 present
= !!(drive
->dev_flags
& IDE_DFLAG_PRESENT
), stat
;
384 /* avoid waiting for inappropriate probes */
385 if (present
&& drive
->media
!= ide_disk
&& cmd
== ATA_CMD_ID_ATA
)
389 printk(KERN_INFO
"probing for %s: present=%d, media=%d, probetype=%s\n",
390 drive
->name
, present
, drive
->media
,
391 (cmd
== ATA_CMD_ID_ATA
) ? "ATA" : "ATAPI");
394 /* needed for some systems
395 * (e.g. crw9624 as drive0 with disk as slave)
401 if (ide_read_device(drive
) != drive
->select
&& present
== 0) {
403 /* exit with drive0 selected */
404 SELECT_DRIVE(hwif
->devices
[0]);
405 /* allow ATA_BUSY to assert & clear */
408 /* no i/f present: mmm.. this should be a 4 -ml */
412 stat
= tp_ops
->read_status(hwif
);
414 if (OK_STAT(stat
, ATA_DRDY
, ATA_BUSY
) ||
415 present
|| cmd
== ATA_CMD_ID_ATAPI
) {
416 /* send cmd and wait */
417 if ((rc
= try_to_identify(drive
, cmd
))) {
418 /* failed: try again */
419 rc
= try_to_identify(drive
,cmd
);
422 stat
= tp_ops
->read_status(hwif
);
424 if (stat
== (ATA_BUSY
| ATA_DRDY
))
427 if (rc
== 1 && cmd
== ATA_CMD_ID_ATAPI
) {
428 printk(KERN_ERR
"%s: no response (status = 0x%02x), "
429 "resetting drive\n", drive
->name
, stat
);
433 tp_ops
->exec_command(hwif
, ATA_CMD_DEV_RESET
);
434 (void)ide_busy_sleep(hwif
, WAIT_WORSTCASE
, 0);
435 rc
= try_to_identify(drive
, cmd
);
438 /* ensure drive IRQ is clear */
439 stat
= tp_ops
->read_status(hwif
);
442 printk(KERN_ERR
"%s: no response (status = 0x%02x)\n",
445 /* not present or maybe ATAPI */
449 /* exit with drive0 selected */
450 SELECT_DRIVE(hwif
->devices
[0]);
452 /* ensure drive irq is clear */
453 (void)tp_ops
->read_status(hwif
);
459 * probe_for_drives - upper level drive probe
460 * @drive: drive to probe for
462 * probe_for_drive() tests for existence of a given drive using do_probe()
463 * and presents things to the user as needed.
465 * Returns: 0 no device was found
467 * (note: IDE_DFLAG_PRESENT might still be not set)
470 static u8
probe_for_drive(ide_drive_t
*drive
)
477 * In order to keep things simple we have an id
478 * block for all drives at all times. If the device
479 * is pre ATA or refuses ATA/ATAPI identify we
480 * will add faked data to this.
482 * Also note that 0 everywhere means "can't do X"
485 drive
->dev_flags
&= ~IDE_DFLAG_ID_READ
;
487 drive
->id
= kzalloc(SECTOR_SIZE
, GFP_KERNEL
);
488 if (drive
->id
== NULL
) {
489 printk(KERN_ERR
"ide: out of memory for id data.\n");
493 m
= (char *)&drive
->id
[ATA_ID_PROD
];
494 strcpy(m
, "UNKNOWN");
497 if ((drive
->dev_flags
& IDE_DFLAG_NOPROBE
) == 0) {
498 /* if !(success||timed-out) */
499 cmd
= ATA_CMD_ID_ATA
;
500 rc
= do_probe(drive
, cmd
);
502 /* look for ATAPI device */
503 cmd
= ATA_CMD_ID_ATAPI
;
504 rc
= do_probe(drive
, cmd
);
507 if ((drive
->dev_flags
& IDE_DFLAG_PRESENT
) == 0)
508 /* drive not found */
511 /* identification failed? */
512 if ((drive
->dev_flags
& IDE_DFLAG_ID_READ
) == 0) {
513 if (drive
->media
== ide_disk
) {
514 printk(KERN_INFO
"%s: non-IDE drive, CHS=%d/%d/%d\n",
515 drive
->name
, drive
->cyl
,
516 drive
->head
, drive
->sect
);
517 } else if (drive
->media
== ide_cdrom
) {
518 printk(KERN_INFO
"%s: ATAPI cdrom (?)\n", drive
->name
);
521 printk(KERN_WARNING
"%s: Unknown device on bus refused identification. Ignoring.\n", drive
->name
);
522 drive
->dev_flags
&= ~IDE_DFLAG_PRESENT
;
525 if (cmd
== ATA_CMD_ID_ATAPI
)
526 ide_classify_atapi_dev(drive
);
528 ide_classify_ata_dev(drive
);
532 if ((drive
->dev_flags
& IDE_DFLAG_PRESENT
) == 0)
535 /* The drive wasn't being helpful. Add generic info only */
536 if ((drive
->dev_flags
& IDE_DFLAG_ID_READ
) == 0) {
541 if (drive
->media
== ide_disk
) {
542 ide_disk_init_chs(drive
);
543 ide_disk_init_mult_count(drive
);
546 return !!(drive
->dev_flags
& IDE_DFLAG_PRESENT
);
549 static void hwif_release_dev(struct device
*dev
)
551 ide_hwif_t
*hwif
= container_of(dev
, ide_hwif_t
, gendev
);
553 complete(&hwif
->gendev_rel_comp
);
556 static int ide_register_port(ide_hwif_t
*hwif
)
560 /* register with global device tree */
561 dev_set_name(&hwif
->gendev
, hwif
->name
);
562 hwif
->gendev
.driver_data
= hwif
;
563 if (hwif
->gendev
.parent
== NULL
)
564 hwif
->gendev
.parent
= hwif
->dev
;
565 hwif
->gendev
.release
= hwif_release_dev
;
567 ret
= device_register(&hwif
->gendev
);
569 printk(KERN_WARNING
"IDE: %s: device_register error: %d\n",
574 hwif
->portdev
= device_create(ide_port_class
, &hwif
->gendev
,
575 MKDEV(0, 0), hwif
, hwif
->name
);
576 if (IS_ERR(hwif
->portdev
)) {
577 ret
= PTR_ERR(hwif
->portdev
);
578 device_unregister(&hwif
->gendev
);
585 * ide_port_wait_ready - wait for port to become ready
588 * This is needed on some PPCs and a bunch of BIOS-less embedded
589 * platforms. Typical cases are:
591 * - The firmware hard reset the disk before booting the kernel,
592 * the drive is still doing it's poweron-reset sequence, that
593 * can take up to 30 seconds.
595 * - The firmware does nothing (or no firmware), the device is
596 * still in POST state (same as above actually).
598 * - Some CD/DVD/Writer combo drives tend to drive the bus during
599 * their reset sequence even when they are non-selected slave
600 * devices, thus preventing discovery of the main HD.
602 * Doing this wait-for-non-busy should not harm any existing
603 * configuration and fix some issues like the above.
607 * Returns 0 on success, error code (< 0) otherwise.
610 static int ide_port_wait_ready(ide_hwif_t
*hwif
)
615 printk(KERN_DEBUG
"Probing IDE interface %s...\n", hwif
->name
);
617 /* Let HW settle down a bit from whatever init state we
621 /* Wait for BSY bit to go away, spec timeout is 30 seconds,
622 * I know of at least one disk who takes 31 seconds, I use 35
625 rc
= ide_wait_not_busy(hwif
, 35000);
629 /* Now make sure both master & slave are ready */
630 ide_port_for_each_dev(i
, drive
, hwif
) {
631 /* Ignore disks that we will not probe for later. */
632 if ((drive
->dev_flags
& IDE_DFLAG_NOPROBE
) == 0 ||
633 (drive
->dev_flags
& IDE_DFLAG_PRESENT
)) {
635 hwif
->tp_ops
->set_irq(hwif
, 1);
637 rc
= ide_wait_not_busy(hwif
, 35000);
641 printk(KERN_DEBUG
"%s: ide_wait_not_busy() skipped\n",
645 /* Exit function with master reselected (let's be sane) */
647 SELECT_DRIVE(hwif
->devices
[0]);
653 * ide_undecoded_slave - look for bad CF adapters
654 * @dev1: slave device
656 * Analyse the drives on the interface and attempt to decide if we
657 * have the same drive viewed twice. This occurs with crap CF adapters
658 * and PCMCIA sometimes.
661 void ide_undecoded_slave(ide_drive_t
*dev1
)
663 ide_drive_t
*dev0
= dev1
->hwif
->devices
[0];
665 if ((dev1
->dn
& 1) == 0 || (dev0
->dev_flags
& IDE_DFLAG_PRESENT
) == 0)
668 /* If the models don't match they are not the same product */
669 if (strcmp((char *)&dev0
->id
[ATA_ID_PROD
],
670 (char *)&dev1
->id
[ATA_ID_PROD
]))
673 /* Serial numbers do not match */
674 if (strncmp((char *)&dev0
->id
[ATA_ID_SERNO
],
675 (char *)&dev1
->id
[ATA_ID_SERNO
], ATA_ID_SERNO_LEN
))
678 /* No serial number, thankfully very rare for CF */
679 if (*(char *)&dev0
->id
[ATA_ID_SERNO
] == 0)
682 /* Appears to be an IDE flash adapter with decode bugs */
683 printk(KERN_WARNING
"ide-probe: ignoring undecoded slave\n");
685 dev1
->dev_flags
&= ~IDE_DFLAG_PRESENT
;
688 EXPORT_SYMBOL_GPL(ide_undecoded_slave
);
690 static int ide_probe_port(ide_hwif_t
*hwif
)
696 BUG_ON(hwif
->present
);
698 if ((hwif
->devices
[0]->dev_flags
& IDE_DFLAG_NOPROBE
) &&
699 (hwif
->devices
[1]->dev_flags
& IDE_DFLAG_NOPROBE
))
703 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
704 * we'll install our IRQ driver much later...
708 disable_irq(hwif
->irq
);
710 if (ide_port_wait_ready(hwif
) == -EBUSY
)
711 printk(KERN_DEBUG
"%s: Wait for ready failed before probe !\n", hwif
->name
);
714 * Second drive should only exist if first drive was found,
715 * but a lot of cdrom drives are configured as single slaves.
717 ide_port_for_each_dev(i
, drive
, hwif
) {
718 (void) probe_for_drive(drive
);
719 if (drive
->dev_flags
& IDE_DFLAG_PRESENT
)
724 * Use cached IRQ number. It might be (and is...) changed by probe
733 static void ide_port_tune_devices(ide_hwif_t
*hwif
)
735 const struct ide_port_ops
*port_ops
= hwif
->port_ops
;
739 ide_port_for_each_present_dev(i
, drive
, hwif
) {
740 if (port_ops
&& port_ops
->quirkproc
)
741 port_ops
->quirkproc(drive
);
744 ide_port_for_each_present_dev(i
, drive
, hwif
) {
745 ide_set_max_pio(drive
);
747 drive
->dev_flags
|= IDE_DFLAG_NICE1
;
757 static int ide_init_queue(ide_drive_t
*drive
)
759 struct request_queue
*q
;
760 ide_hwif_t
*hwif
= drive
->hwif
;
761 int max_sectors
= 256;
762 int max_sg_entries
= PRD_ENTRIES
;
765 * Our default set up assumes the normal IDE case,
766 * that is 64K segmenting, standard PRD setup
767 * and LBA28. Some drivers then impose their own
768 * limits and LBA48 we could raise it but as yet
772 q
= blk_init_queue_node(do_ide_request
, NULL
, hwif_to_node(hwif
));
776 q
->queuedata
= drive
;
777 blk_queue_segment_boundary(q
, 0xffff);
779 if (hwif
->rqsize
< max_sectors
)
780 max_sectors
= hwif
->rqsize
;
781 blk_queue_max_sectors(q
, max_sectors
);
784 /* When we have an IOMMU, we may have a problem where pci_map_sg()
785 * creates segments that don't completely match our boundary
786 * requirements and thus need to be broken up again. Because it
787 * doesn't align properly either, we may actually have to break up
788 * to more segments than what was we got in the first place, a max
789 * worst case is twice as many.
790 * This will be fixed once we teach pci_map_sg() about our boundary
791 * requirements, hopefully soon. *FIXME*
793 if (!PCI_DMA_BUS_IS_PHYS
)
794 max_sg_entries
>>= 1;
795 #endif /* CONFIG_PCI */
797 blk_queue_max_hw_segments(q
, max_sg_entries
);
798 blk_queue_max_phys_segments(q
, max_sg_entries
);
800 /* assign drive queue */
803 /* needs drive->queue to be set */
804 ide_toggle_bounce(drive
, 1);
809 static DEFINE_MUTEX(ide_cfg_mtx
);
812 * For any present drive:
813 * - allocate the block device queue
815 static int ide_port_setup_devices(ide_hwif_t
*hwif
)
820 mutex_lock(&ide_cfg_mtx
);
821 ide_port_for_each_present_dev(i
, drive
, hwif
) {
822 if (ide_init_queue(drive
)) {
823 printk(KERN_ERR
"ide: failed to init %s\n",
827 drive
->dev_flags
&= ~IDE_DFLAG_PRESENT
;
833 mutex_unlock(&ide_cfg_mtx
);
839 * This routine sets up the IRQ for an IDE interface.
841 static int init_irq (ide_hwif_t
*hwif
)
843 struct ide_io_ports
*io_ports
= &hwif
->io_ports
;
844 irq_handler_t irq_handler
;
847 irq_handler
= hwif
->host
->irq_handler
;
848 if (irq_handler
== NULL
)
849 irq_handler
= ide_intr
;
851 #if defined(__mc68000__)
853 #endif /* __mc68000__ */
855 if (hwif
->chipset
== ide_pci
)
858 if (io_ports
->ctl_addr
)
859 hwif
->tp_ops
->set_irq(hwif
, 1);
861 if (request_irq(hwif
->irq
, irq_handler
, sa
, hwif
->name
, hwif
))
865 if ((hwif
->host_flags
& IDE_HFLAG_NO_LBA48
) ||
866 (hwif
->host_flags
& IDE_HFLAG_NO_LBA48_DMA
))
869 hwif
->rqsize
= 65536;
872 #if !defined(__mc68000__)
873 printk(KERN_INFO
"%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif
->name
,
874 io_ports
->data_addr
, io_ports
->status_addr
,
875 io_ports
->ctl_addr
, hwif
->irq
);
877 printk(KERN_INFO
"%s at 0x%08lx on irq %d", hwif
->name
,
878 io_ports
->data_addr
, hwif
->irq
);
879 #endif /* __mc68000__ */
880 if (hwif
->host
->host_flags
& IDE_HFLAG_SERIALIZE
)
881 printk(KERN_CONT
" (serialized)");
882 printk(KERN_CONT
"\n");
889 static int ata_lock(dev_t dev
, void *data
)
891 /* FIXME: we want to pin hwif down */
895 static struct kobject
*ata_probe(dev_t dev
, int *part
, void *data
)
897 ide_hwif_t
*hwif
= data
;
898 int unit
= *part
>> PARTN_BITS
;
899 ide_drive_t
*drive
= hwif
->devices
[unit
];
901 if ((drive
->dev_flags
& IDE_DFLAG_PRESENT
) == 0)
904 if (drive
->media
== ide_disk
)
905 request_module("ide-disk");
906 if (drive
->media
== ide_cdrom
|| drive
->media
== ide_optical
)
907 request_module("ide-cd");
908 if (drive
->media
== ide_tape
)
909 request_module("ide-tape");
910 if (drive
->media
== ide_floppy
)
911 request_module("ide-floppy");
916 static struct kobject
*exact_match(dev_t dev
, int *part
, void *data
)
918 struct gendisk
*p
= data
;
919 *part
&= (1 << PARTN_BITS
) - 1;
920 return &disk_to_dev(p
)->kobj
;
923 static int exact_lock(dev_t dev
, void *data
)
925 struct gendisk
*p
= data
;
932 void ide_register_region(struct gendisk
*disk
)
934 blk_register_region(MKDEV(disk
->major
, disk
->first_minor
),
935 disk
->minors
, NULL
, exact_match
, exact_lock
, disk
);
938 EXPORT_SYMBOL_GPL(ide_register_region
);
940 void ide_unregister_region(struct gendisk
*disk
)
942 blk_unregister_region(MKDEV(disk
->major
, disk
->first_minor
),
946 EXPORT_SYMBOL_GPL(ide_unregister_region
);
948 void ide_init_disk(struct gendisk
*disk
, ide_drive_t
*drive
)
950 ide_hwif_t
*hwif
= drive
->hwif
;
951 unsigned int unit
= drive
->dn
& 1;
953 disk
->major
= hwif
->major
;
954 disk
->first_minor
= unit
<< PARTN_BITS
;
955 sprintf(disk
->disk_name
, "hd%c", 'a' + hwif
->index
* MAX_DRIVES
+ unit
);
956 disk
->queue
= drive
->queue
;
959 EXPORT_SYMBOL_GPL(ide_init_disk
);
961 static void drive_release_dev (struct device
*dev
)
963 ide_drive_t
*drive
= container_of(dev
, ide_drive_t
, gendev
);
964 ide_hwif_t
*hwif
= drive
->hwif
;
966 ide_proc_unregister_device(drive
);
968 spin_lock_irq(&hwif
->lock
);
971 drive
->dev_flags
&= ~IDE_DFLAG_PRESENT
;
972 /* Messed up locking ... */
973 spin_unlock_irq(&hwif
->lock
);
974 blk_cleanup_queue(drive
->queue
);
975 spin_lock_irq(&hwif
->lock
);
977 spin_unlock_irq(&hwif
->lock
);
979 complete(&drive
->gendev_rel_comp
);
982 static int hwif_init(ide_hwif_t
*hwif
)
985 printk(KERN_ERR
"%s: disabled, no IRQ\n", hwif
->name
);
989 if (register_blkdev(hwif
->major
, hwif
->name
))
992 if (!hwif
->sg_max_nents
)
993 hwif
->sg_max_nents
= PRD_ENTRIES
;
995 hwif
->sg_table
= kmalloc(sizeof(struct scatterlist
)*hwif
->sg_max_nents
,
997 if (!hwif
->sg_table
) {
998 printk(KERN_ERR
"%s: unable to allocate SG table.\n", hwif
->name
);
1002 sg_init_table(hwif
->sg_table
, hwif
->sg_max_nents
);
1004 if (init_irq(hwif
)) {
1005 printk(KERN_ERR
"%s: disabled, unable to get IRQ %d\n",
1006 hwif
->name
, hwif
->irq
);
1010 blk_register_region(MKDEV(hwif
->major
, 0), MAX_DRIVES
<< PARTN_BITS
,
1011 THIS_MODULE
, ata_probe
, ata_lock
, hwif
);
1015 unregister_blkdev(hwif
->major
, hwif
->name
);
1019 static void hwif_register_devices(ide_hwif_t
*hwif
)
1024 ide_port_for_each_present_dev(i
, drive
, hwif
) {
1025 struct device
*dev
= &drive
->gendev
;
1028 dev_set_name(dev
, "%u.%u", hwif
->index
, i
);
1029 dev
->parent
= &hwif
->gendev
;
1030 dev
->bus
= &ide_bus_type
;
1031 dev
->driver_data
= drive
;
1032 dev
->release
= drive_release_dev
;
1034 ret
= device_register(dev
);
1036 printk(KERN_WARNING
"IDE: %s: device_register error: "
1037 "%d\n", __func__
, ret
);
1041 static void ide_port_init_devices(ide_hwif_t
*hwif
)
1043 const struct ide_port_ops
*port_ops
= hwif
->port_ops
;
1047 ide_port_for_each_dev(i
, drive
, hwif
) {
1048 drive
->dn
= i
+ hwif
->channel
* 2;
1050 if (hwif
->host_flags
& IDE_HFLAG_IO_32BIT
)
1051 drive
->io_32bit
= 1;
1052 if (hwif
->host_flags
& IDE_HFLAG_NO_IO_32BIT
)
1053 drive
->dev_flags
|= IDE_DFLAG_NO_IO_32BIT
;
1054 if (hwif
->host_flags
& IDE_HFLAG_UNMASK_IRQS
)
1055 drive
->dev_flags
|= IDE_DFLAG_UNMASK
;
1056 if (hwif
->host_flags
& IDE_HFLAG_NO_UNMASK_IRQS
)
1057 drive
->dev_flags
|= IDE_DFLAG_NO_UNMASK
;
1059 if (port_ops
&& port_ops
->init_dev
)
1060 port_ops
->init_dev(drive
);
1064 static void ide_init_port(ide_hwif_t
*hwif
, unsigned int port
,
1065 const struct ide_port_info
*d
)
1067 hwif
->channel
= port
;
1070 hwif
->chipset
= d
->chipset
;
1075 /* ->host_flags may be set by ->init_iops (or even earlier...) */
1076 hwif
->host_flags
|= d
->host_flags
;
1077 hwif
->pio_mask
= d
->pio_mask
;
1080 hwif
->tp_ops
= d
->tp_ops
;
1082 /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1083 if (hwif
->chipset
!= ide_dtc2278
|| hwif
->channel
== 0)
1084 hwif
->port_ops
= d
->port_ops
;
1086 hwif
->swdma_mask
= d
->swdma_mask
;
1087 hwif
->mwdma_mask
= d
->mwdma_mask
;
1088 hwif
->ultra_mask
= d
->udma_mask
;
1090 if ((d
->host_flags
& IDE_HFLAG_NO_DMA
) == 0) {
1093 hwif
->dma_ops
= d
->dma_ops
;
1096 rc
= d
->init_dma(hwif
, d
);
1098 rc
= ide_hwif_setup_dma(hwif
, d
);
1101 printk(KERN_INFO
"%s: DMA disabled\n", hwif
->name
);
1103 hwif
->dma_ops
= NULL
;
1105 hwif
->swdma_mask
= 0;
1106 hwif
->mwdma_mask
= 0;
1107 hwif
->ultra_mask
= 0;
1111 if ((d
->host_flags
& IDE_HFLAG_SERIALIZE
) ||
1112 ((d
->host_flags
& IDE_HFLAG_SERIALIZE_DMA
) && hwif
->dma_base
))
1113 hwif
->host
->host_flags
|= IDE_HFLAG_SERIALIZE
;
1116 hwif
->rqsize
= d
->max_sectors
;
1118 /* call chipset specific routine for each enabled port */
1123 static void ide_port_cable_detect(ide_hwif_t
*hwif
)
1125 const struct ide_port_ops
*port_ops
= hwif
->port_ops
;
1127 if (port_ops
&& port_ops
->cable_detect
&& (hwif
->ultra_mask
& 0x78)) {
1128 if (hwif
->cbl
!= ATA_CBL_PATA40_SHORT
)
1129 hwif
->cbl
= port_ops
->cable_detect(hwif
);
1133 static const u8 ide_hwif_to_major
[] =
1134 { IDE0_MAJOR
, IDE1_MAJOR
, IDE2_MAJOR
, IDE3_MAJOR
, IDE4_MAJOR
,
1135 IDE5_MAJOR
, IDE6_MAJOR
, IDE7_MAJOR
, IDE8_MAJOR
, IDE9_MAJOR
};
1137 static void ide_port_init_devices_data(ide_hwif_t
*hwif
)
1142 ide_port_for_each_dev(i
, drive
, hwif
) {
1143 u8 j
= (hwif
->index
* MAX_DRIVES
) + i
;
1145 memset(drive
, 0, sizeof(*drive
));
1147 drive
->media
= ide_disk
;
1148 drive
->select
= (i
<< 4) | ATA_DEVICE_OBS
;
1150 drive
->ready_stat
= ATA_DRDY
;
1151 drive
->bad_wstat
= BAD_W_STAT
;
1152 drive
->special
.b
.recalibrate
= 1;
1153 drive
->special
.b
.set_geometry
= 1;
1154 drive
->name
[0] = 'h';
1155 drive
->name
[1] = 'd';
1156 drive
->name
[2] = 'a' + j
;
1157 drive
->max_failures
= IDE_DEFAULT_MAX_FAILURES
;
1159 INIT_LIST_HEAD(&drive
->list
);
1160 init_completion(&drive
->gendev_rel_comp
);
1164 static void ide_init_port_data(ide_hwif_t
*hwif
, unsigned int index
)
1166 /* fill in any non-zero initial values */
1167 hwif
->index
= index
;
1168 hwif
->major
= ide_hwif_to_major
[index
];
1170 hwif
->name
[0] = 'i';
1171 hwif
->name
[1] = 'd';
1172 hwif
->name
[2] = 'e';
1173 hwif
->name
[3] = '0' + index
;
1175 spin_lock_init(&hwif
->lock
);
1177 init_timer(&hwif
->timer
);
1178 hwif
->timer
.function
= &ide_timer_expiry
;
1179 hwif
->timer
.data
= (unsigned long)hwif
;
1181 init_completion(&hwif
->gendev_rel_comp
);
1183 hwif
->tp_ops
= &default_tp_ops
;
1185 ide_port_init_devices_data(hwif
);
1188 static void ide_init_port_hw(ide_hwif_t
*hwif
, hw_regs_t
*hw
)
1190 memcpy(&hwif
->io_ports
, &hw
->io_ports
, sizeof(hwif
->io_ports
));
1191 hwif
->irq
= hw
->irq
;
1192 hwif
->chipset
= hw
->chipset
;
1193 hwif
->dev
= hw
->dev
;
1194 hwif
->gendev
.parent
= hw
->parent
? hw
->parent
: hw
->dev
;
1195 hwif
->ack_intr
= hw
->ack_intr
;
1196 hwif
->config_data
= hw
->config
;
1199 static unsigned int ide_indexes
;
1202 * ide_find_port_slot - find free port slot
1205 * Return the new port slot index or -ENOENT if we are out of free slots.
1208 static int ide_find_port_slot(const struct ide_port_info
*d
)
1211 u8 bootable
= (d
&& (d
->host_flags
& IDE_HFLAG_NON_BOOTABLE
)) ? 0 : 1;
1212 u8 i
= (d
&& (d
->host_flags
& IDE_HFLAG_QD_2ND_PORT
)) ? 1 : 0;;
1215 * Claim an unassigned slot.
1217 * Give preference to claiming other slots before claiming ide0/ide1,
1218 * just in case there's another interface yet-to-be-scanned
1219 * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1221 * Unless there is a bootable card that does not use the standard
1222 * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1224 mutex_lock(&ide_cfg_mtx
);
1226 if ((ide_indexes
| i
) != (1 << MAX_HWIFS
) - 1)
1227 idx
= ffz(ide_indexes
| i
);
1229 if ((ide_indexes
| 3) != (1 << MAX_HWIFS
) - 1)
1230 idx
= ffz(ide_indexes
| 3);
1231 else if ((ide_indexes
& 3) != 3)
1232 idx
= ffz(ide_indexes
);
1235 ide_indexes
|= (1 << idx
);
1236 mutex_unlock(&ide_cfg_mtx
);
1241 static void ide_free_port_slot(int idx
)
1243 mutex_lock(&ide_cfg_mtx
);
1244 ide_indexes
&= ~(1 << idx
);
1245 mutex_unlock(&ide_cfg_mtx
);
1248 static void ide_port_free_devices(ide_hwif_t
*hwif
)
1253 ide_port_for_each_dev(i
, drive
, hwif
)
1257 static int ide_port_alloc_devices(ide_hwif_t
*hwif
, int node
)
1261 for (i
= 0; i
< MAX_DRIVES
; i
++) {
1264 drive
= kzalloc_node(sizeof(*drive
), GFP_KERNEL
, node
);
1268 hwif
->devices
[i
] = drive
;
1273 ide_port_free_devices(hwif
);
1277 struct ide_host
*ide_host_alloc(const struct ide_port_info
*d
, hw_regs_t
**hws
)
1279 struct ide_host
*host
;
1280 struct device
*dev
= hws
[0] ? hws
[0]->dev
: NULL
;
1281 int node
= dev
? dev_to_node(dev
) : -1;
1284 host
= kzalloc_node(sizeof(*host
), GFP_KERNEL
, node
);
1288 for (i
= 0; i
< MAX_HOST_PORTS
; i
++) {
1295 hwif
= kzalloc_node(sizeof(*hwif
), GFP_KERNEL
, node
);
1299 if (ide_port_alloc_devices(hwif
, node
) < 0) {
1304 idx
= ide_find_port_slot(d
);
1306 printk(KERN_ERR
"%s: no free slot for interface\n",
1307 d
? d
->name
: "ide");
1312 ide_init_port_data(hwif
, idx
);
1316 host
->ports
[i
] = hwif
;
1320 if (host
->n_ports
== 0) {
1328 host
->init_chipset
= d
->init_chipset
;
1329 host
->host_flags
= d
->host_flags
;
1334 EXPORT_SYMBOL_GPL(ide_host_alloc
);
1336 static void ide_port_free(ide_hwif_t
*hwif
)
1338 ide_port_free_devices(hwif
);
1339 ide_free_port_slot(hwif
->index
);
1343 static void ide_disable_port(ide_hwif_t
*hwif
)
1345 struct ide_host
*host
= hwif
->host
;
1348 printk(KERN_INFO
"%s: disabling port\n", hwif
->name
);
1350 for (i
= 0; i
< MAX_HOST_PORTS
; i
++) {
1351 if (host
->ports
[i
] == hwif
) {
1352 host
->ports
[i
] = NULL
;
1357 ide_port_free(hwif
);
1360 int ide_host_register(struct ide_host
*host
, const struct ide_port_info
*d
,
1363 ide_hwif_t
*hwif
, *mate
= NULL
;
1366 ide_host_for_each_port(i
, hwif
, host
) {
1372 ide_init_port_hw(hwif
, hws
[i
]);
1373 ide_port_apply_params(hwif
);
1378 if ((i
& 1) && mate
) {
1383 mate
= (i
& 1) ? NULL
: hwif
;
1385 ide_init_port(hwif
, i
& 1, d
);
1386 ide_port_cable_detect(hwif
);
1389 ide_port_init_devices(hwif
);
1392 ide_host_for_each_port(i
, hwif
, host
) {
1396 if (ide_probe_port(hwif
) == 0)
1399 if (hwif
->chipset
!= ide_4drives
|| !hwif
->mate
||
1400 !hwif
->mate
->present
) {
1401 if (ide_register_port(hwif
)) {
1402 ide_disable_port(hwif
);
1408 ide_port_tune_devices(hwif
);
1411 ide_host_for_each_port(i
, hwif
, host
) {
1415 if (hwif_init(hwif
) == 0) {
1416 printk(KERN_INFO
"%s: failed to initialize IDE "
1417 "interface\n", hwif
->name
);
1418 device_unregister(&hwif
->gendev
);
1419 ide_disable_port(hwif
);
1424 if (ide_port_setup_devices(hwif
) == 0) {
1431 ide_acpi_init_port(hwif
);
1434 ide_acpi_port_init_devices(hwif
);
1437 ide_host_for_each_port(i
, hwif
, host
) {
1442 hwif_register_devices(hwif
);
1445 ide_host_for_each_port(i
, hwif
, host
) {
1449 ide_sysfs_register_port(hwif
);
1450 ide_proc_register_port(hwif
);
1453 ide_proc_port_register_devices(hwif
);
1458 EXPORT_SYMBOL_GPL(ide_host_register
);
1460 int ide_host_add(const struct ide_port_info
*d
, hw_regs_t
**hws
,
1461 struct ide_host
**hostp
)
1463 struct ide_host
*host
;
1466 host
= ide_host_alloc(d
, hws
);
1470 rc
= ide_host_register(host
, d
, hws
);
1472 ide_host_free(host
);
1481 EXPORT_SYMBOL_GPL(ide_host_add
);
1483 static void __ide_port_unregister_devices(ide_hwif_t
*hwif
)
1488 ide_port_for_each_present_dev(i
, drive
, hwif
) {
1489 device_unregister(&drive
->gendev
);
1490 wait_for_completion(&drive
->gendev_rel_comp
);
1494 void ide_port_unregister_devices(ide_hwif_t
*hwif
)
1496 mutex_lock(&ide_cfg_mtx
);
1497 __ide_port_unregister_devices(hwif
);
1499 ide_port_init_devices_data(hwif
);
1500 mutex_unlock(&ide_cfg_mtx
);
1502 EXPORT_SYMBOL_GPL(ide_port_unregister_devices
);
1505 * ide_unregister - free an IDE interface
1506 * @hwif: IDE interface
1508 * Perform the final unregister of an IDE interface.
1511 * The caller must not hold the IDE locks.
1513 * It is up to the caller to be sure there is no pending I/O here,
1514 * and that the interface will not be reopened (present/vanishing
1515 * locking isn't yet done BTW).
1518 static void ide_unregister(ide_hwif_t
*hwif
)
1520 BUG_ON(in_interrupt());
1521 BUG_ON(irqs_disabled());
1523 mutex_lock(&ide_cfg_mtx
);
1525 if (hwif
->present
) {
1526 __ide_port_unregister_devices(hwif
);
1530 ide_proc_unregister_port(hwif
);
1532 free_irq(hwif
->irq
, hwif
);
1534 device_unregister(hwif
->portdev
);
1535 device_unregister(&hwif
->gendev
);
1536 wait_for_completion(&hwif
->gendev_rel_comp
);
1539 * Remove us from the kernel's knowledge
1541 blk_unregister_region(MKDEV(hwif
->major
, 0), MAX_DRIVES
<<PARTN_BITS
);
1542 kfree(hwif
->sg_table
);
1543 unregister_blkdev(hwif
->major
, hwif
->name
);
1545 ide_release_dma_engine(hwif
);
1547 mutex_unlock(&ide_cfg_mtx
);
1550 void ide_host_free(struct ide_host
*host
)
1555 ide_host_for_each_port(i
, hwif
, host
) {
1557 ide_port_free(hwif
);
1562 EXPORT_SYMBOL_GPL(ide_host_free
);
1564 void ide_host_remove(struct ide_host
*host
)
1569 ide_host_for_each_port(i
, hwif
, host
) {
1571 ide_unregister(hwif
);
1574 ide_host_free(host
);
1576 EXPORT_SYMBOL_GPL(ide_host_remove
);
1578 void ide_port_scan(ide_hwif_t
*hwif
)
1580 ide_port_apply_params(hwif
);
1581 ide_port_cable_detect(hwif
);
1582 ide_port_init_devices(hwif
);
1584 if (ide_probe_port(hwif
) < 0)
1589 ide_port_tune_devices(hwif
);
1590 ide_port_setup_devices(hwif
);
1591 ide_acpi_port_init_devices(hwif
);
1592 hwif_register_devices(hwif
);
1593 ide_proc_port_register_devices(hwif
);
1595 EXPORT_SYMBOL_GPL(ide_port_scan
);