2 * Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
3 * Copyright (C) 2003-2005, 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 multiple IDE interface driver, as evolved from hd.c.
14 * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
16 * There can be up to two drives per interface, as per the ATA-2 spec.
22 * | It traverses the request-list, using interrupts to jump between functions.
23 * | As nearly all functions can be called within interrupts, we may not sleep.
24 * | Special care is recommended. Have Fun!
26 * | modified by Drew Eckhardt to check nr of hd's from the CMOS.
28 * | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
29 * | in the early extended-partition checks and added DM partitions.
31 * | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
33 * | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
34 * | and general streamlining by Mark Lord (mlord@pobox.com).
36 * October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
38 * Mark Lord (mlord@pobox.com) (IDE Perf.Pkg)
39 * Delman Lee (delman@ieee.org) ("Mr. atdisk2")
40 * Scott Snyder (snyder@fnald0.fnal.gov) (ATAPI IDE cd-rom)
42 * This was a rewrite of just about everything from hd.c, though some original
43 * code is still sprinkled about. Think of it as a major evolution, with
44 * inspiration from lots of linux users, esp. hamish@zot.apana.org.au
47 #include <linux/module.h>
48 #include <linux/types.h>
49 #include <linux/string.h>
50 #include <linux/kernel.h>
51 #include <linux/interrupt.h>
52 #include <linux/major.h>
53 #include <linux/errno.h>
54 #include <linux/genhd.h>
55 #include <linux/slab.h>
56 #include <linux/init.h>
57 #include <linux/pci.h>
58 #include <linux/ide.h>
59 #include <linux/hdreg.h>
60 #include <linux/completion.h>
61 #include <linux/device.h>
64 /* default maximum number of failures */
65 #define IDE_DEFAULT_MAX_FAILURES 1
67 struct class *ide_port_class
;
69 static const u8 ide_hwif_to_major
[] = { IDE0_MAJOR
, IDE1_MAJOR
,
70 IDE2_MAJOR
, IDE3_MAJOR
,
71 IDE4_MAJOR
, IDE5_MAJOR
,
72 IDE6_MAJOR
, IDE7_MAJOR
,
73 IDE8_MAJOR
, IDE9_MAJOR
};
75 DEFINE_MUTEX(ide_cfg_mtx
);
77 static void ide_port_init_devices_data(ide_hwif_t
*);
80 * Do not even *think* about calling this!
82 void ide_init_port_data(ide_hwif_t
*hwif
, unsigned int index
)
84 /* bulk initialize hwif & drive info with zeros */
85 memset(hwif
, 0, sizeof(ide_hwif_t
));
87 /* fill in any non-zero initial values */
89 hwif
->major
= ide_hwif_to_major
[index
];
94 hwif
->name
[3] = '0' + index
;
96 init_completion(&hwif
->gendev_rel_comp
);
98 hwif
->tp_ops
= &default_tp_ops
;
100 ide_port_init_devices_data(hwif
);
103 static void ide_port_init_devices_data(ide_hwif_t
*hwif
)
107 for (unit
= 0; unit
< MAX_DRIVES
; ++unit
) {
108 ide_drive_t
*drive
= &hwif
->drives
[unit
];
109 u8 j
= (hwif
->index
* MAX_DRIVES
) + unit
;
111 memset(drive
, 0, sizeof(*drive
));
113 drive
->media
= ide_disk
;
114 drive
->select
= (unit
<< 4) | ATA_DEVICE_OBS
;
116 drive
->ready_stat
= ATA_DRDY
;
117 drive
->bad_wstat
= BAD_W_STAT
;
118 drive
->special
.b
.recalibrate
= 1;
119 drive
->special
.b
.set_geometry
= 1;
120 drive
->name
[0] = 'h';
121 drive
->name
[1] = 'd';
122 drive
->name
[2] = 'a' + j
;
123 drive
->max_failures
= IDE_DEFAULT_MAX_FAILURES
;
125 INIT_LIST_HEAD(&drive
->list
);
126 init_completion(&drive
->gendev_rel_comp
);
130 static void __ide_port_unregister_devices(ide_hwif_t
*hwif
)
134 for (i
= 0; i
< MAX_DRIVES
; i
++) {
135 ide_drive_t
*drive
= &hwif
->drives
[i
];
137 if (drive
->dev_flags
& IDE_DFLAG_PRESENT
) {
138 device_unregister(&drive
->gendev
);
139 wait_for_completion(&drive
->gendev_rel_comp
);
144 void ide_port_unregister_devices(ide_hwif_t
*hwif
)
146 mutex_lock(&ide_cfg_mtx
);
147 __ide_port_unregister_devices(hwif
);
149 ide_port_init_devices_data(hwif
);
150 mutex_unlock(&ide_cfg_mtx
);
152 EXPORT_SYMBOL_GPL(ide_port_unregister_devices
);
155 * ide_unregister - free an IDE interface
156 * @hwif: IDE interface
158 * Perform the final unregister of an IDE interface. At the moment
159 * we don't refcount interfaces so this will also get split up.
162 * The caller must not hold the IDE locks
163 * The drive present/vanishing is not yet properly locked
164 * Take care with the callbacks. These have been split to avoid
165 * deadlocking the IDE layer. The shutdown callback is called
166 * before we take the lock and free resources. It is up to the
167 * caller to be sure there is no pending I/O here, and that
168 * the interface will not be reopened (present/vanishing locking
169 * isn't yet done BTW). After we commit to the final kill we
170 * call the cleanup callback with the ide locks held.
172 * Unregister restores the hwif structures to the default state.
173 * This is raving bonkers.
176 void ide_unregister(ide_hwif_t
*hwif
)
178 BUG_ON(in_interrupt());
179 BUG_ON(irqs_disabled());
181 mutex_lock(&ide_cfg_mtx
);
184 __ide_port_unregister_devices(hwif
);
188 ide_proc_unregister_port(hwif
);
190 free_irq(hwif
->irq
, hwif
);
192 device_unregister(hwif
->portdev
);
193 device_unregister(&hwif
->gendev
);
194 wait_for_completion(&hwif
->gendev_rel_comp
);
197 * Remove us from the kernel's knowledge
199 blk_unregister_region(MKDEV(hwif
->major
, 0), MAX_DRIVES
<<PARTN_BITS
);
200 kfree(hwif
->sg_table
);
201 unregister_blkdev(hwif
->major
, hwif
->name
);
203 ide_release_dma_engine(hwif
);
205 mutex_unlock(&ide_cfg_mtx
);
208 void ide_init_port_hw(ide_hwif_t
*hwif
, hw_regs_t
*hw
)
210 memcpy(&hwif
->io_ports
, &hw
->io_ports
, sizeof(hwif
->io_ports
));
212 hwif
->chipset
= hw
->chipset
;
214 hwif
->gendev
.parent
= hw
->parent
? hw
->parent
: hw
->dev
;
215 hwif
->ack_intr
= hw
->ack_intr
;
216 hwif
->config_data
= hw
->config
;
220 * Locks for IDE setting functionality
223 DEFINE_MUTEX(ide_setting_mtx
);
225 ide_devset_get(io_32bit
, io_32bit
);
227 static int set_io_32bit(ide_drive_t
*drive
, int arg
)
229 if (drive
->dev_flags
& IDE_DFLAG_NO_IO_32BIT
)
232 if (arg
< 0 || arg
> 1 + (SUPPORT_VLB_SYNC
<< 1))
235 drive
->io_32bit
= arg
;
240 ide_devset_get_flag(ksettings
, IDE_DFLAG_KEEP_SETTINGS
);
242 static int set_ksettings(ide_drive_t
*drive
, int arg
)
244 if (arg
< 0 || arg
> 1)
248 drive
->dev_flags
|= IDE_DFLAG_KEEP_SETTINGS
;
250 drive
->dev_flags
&= ~IDE_DFLAG_KEEP_SETTINGS
;
255 ide_devset_get_flag(using_dma
, IDE_DFLAG_USING_DMA
);
257 static int set_using_dma(ide_drive_t
*drive
, int arg
)
259 #ifdef CONFIG_BLK_DEV_IDEDMA
262 if (arg
< 0 || arg
> 1)
265 if (ata_id_has_dma(drive
->id
) == 0)
268 if (drive
->hwif
->dma_ops
== NULL
)
274 if (ide_set_dma(drive
))
282 if (arg
< 0 || arg
> 1)
290 * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away
292 static int set_pio_mode_abuse(ide_hwif_t
*hwif
, u8 req_pio
)
301 return (hwif
->host_flags
& IDE_HFLAG_ABUSE_DMA_MODES
) ? 1 : 0;
304 return (hwif
->host_flags
& IDE_HFLAG_ABUSE_PREFETCH
) ? 1 : 0;
307 return (hwif
->host_flags
& IDE_HFLAG_ABUSE_FAST_DEVSEL
) ? 1 : 0;
313 static int set_pio_mode(ide_drive_t
*drive
, int arg
)
315 ide_hwif_t
*hwif
= drive
->hwif
;
316 const struct ide_port_ops
*port_ops
= hwif
->port_ops
;
318 if (arg
< 0 || arg
> 255)
321 if (port_ops
== NULL
|| port_ops
->set_pio_mode
== NULL
||
322 (hwif
->host_flags
& IDE_HFLAG_NO_SET_MODE
))
325 if (set_pio_mode_abuse(drive
->hwif
, arg
)) {
326 if (arg
== 8 || arg
== 9) {
329 /* take lock for IDE_DFLAG_[NO_]UNMASK/[NO_]IO_32BIT */
330 spin_lock_irqsave(&hwif
->lock
, flags
);
331 port_ops
->set_pio_mode(drive
, arg
);
332 spin_unlock_irqrestore(&hwif
->lock
, flags
);
334 port_ops
->set_pio_mode(drive
, arg
);
336 int keep_dma
= !!(drive
->dev_flags
& IDE_DFLAG_USING_DMA
);
338 ide_set_pio(drive
, arg
);
340 if (hwif
->host_flags
& IDE_HFLAG_SET_PIO_MODE_KEEP_DMA
) {
349 ide_devset_get_flag(unmaskirq
, IDE_DFLAG_UNMASK
);
351 static int set_unmaskirq(ide_drive_t
*drive
, int arg
)
353 if (drive
->dev_flags
& IDE_DFLAG_NO_UNMASK
)
356 if (arg
< 0 || arg
> 1)
360 drive
->dev_flags
|= IDE_DFLAG_UNMASK
;
362 drive
->dev_flags
&= ~IDE_DFLAG_UNMASK
;
367 ide_ext_devset_rw_sync(io_32bit
, io_32bit
);
368 ide_ext_devset_rw_sync(keepsettings
, ksettings
);
369 ide_ext_devset_rw_sync(unmaskirq
, unmaskirq
);
370 ide_ext_devset_rw_sync(using_dma
, using_dma
);
371 __IDE_DEVSET(pio_mode
, DS_SYNC
, NULL
, set_pio_mode
);
374 * ide_device_get - get an additional reference to a ide_drive_t
375 * @drive: device to get a reference to
377 * Gets a reference to the ide_drive_t and increments the use count of the
378 * underlying LLDD module.
380 int ide_device_get(ide_drive_t
*drive
)
382 struct device
*host_dev
;
383 struct module
*module
;
385 if (!get_device(&drive
->gendev
))
388 host_dev
= drive
->hwif
->host
->dev
[0];
389 module
= host_dev
? host_dev
->driver
->owner
: NULL
;
391 if (module
&& !try_module_get(module
)) {
392 put_device(&drive
->gendev
);
398 EXPORT_SYMBOL_GPL(ide_device_get
);
401 * ide_device_put - release a reference to a ide_drive_t
402 * @drive: device to release a reference on
404 * Release a reference to the ide_drive_t and decrements the use count of
405 * the underlying LLDD module.
407 void ide_device_put(ide_drive_t
*drive
)
409 #ifdef CONFIG_MODULE_UNLOAD
410 struct device
*host_dev
= drive
->hwif
->host
->dev
[0];
411 struct module
*module
= host_dev
? host_dev
->driver
->owner
: NULL
;
416 put_device(&drive
->gendev
);
418 EXPORT_SYMBOL_GPL(ide_device_put
);
420 static int ide_bus_match(struct device
*dev
, struct device_driver
*drv
)
425 static int ide_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
427 ide_drive_t
*drive
= to_ide_device(dev
);
429 add_uevent_var(env
, "MEDIA=%s", ide_media_string(drive
));
430 add_uevent_var(env
, "DRIVENAME=%s", drive
->name
);
431 add_uevent_var(env
, "MODALIAS=ide:m-%s", ide_media_string(drive
));
435 static int generic_ide_probe(struct device
*dev
)
437 ide_drive_t
*drive
= to_ide_device(dev
);
438 ide_driver_t
*drv
= to_ide_driver(dev
->driver
);
440 return drv
->probe
? drv
->probe(drive
) : -ENODEV
;
443 static int generic_ide_remove(struct device
*dev
)
445 ide_drive_t
*drive
= to_ide_device(dev
);
446 ide_driver_t
*drv
= to_ide_driver(dev
->driver
);
454 static void generic_ide_shutdown(struct device
*dev
)
456 ide_drive_t
*drive
= to_ide_device(dev
);
457 ide_driver_t
*drv
= to_ide_driver(dev
->driver
);
459 if (dev
->driver
&& drv
->shutdown
)
460 drv
->shutdown(drive
);
463 struct bus_type ide_bus_type
= {
465 .match
= ide_bus_match
,
466 .uevent
= ide_uevent
,
467 .probe
= generic_ide_probe
,
468 .remove
= generic_ide_remove
,
469 .shutdown
= generic_ide_shutdown
,
470 .dev_attrs
= ide_dev_attrs
,
471 .suspend
= generic_ide_suspend
,
472 .resume
= generic_ide_resume
,
475 EXPORT_SYMBOL_GPL(ide_bus_type
);
478 EXPORT_SYMBOL_GPL(ide_vlb_clk
);
480 module_param_named(vlb_clock
, ide_vlb_clk
, int, 0);
481 MODULE_PARM_DESC(vlb_clock
, "VLB clock frequency (in MHz)");
484 EXPORT_SYMBOL_GPL(ide_pci_clk
);
486 module_param_named(pci_clock
, ide_pci_clk
, int, 0);
487 MODULE_PARM_DESC(pci_clock
, "PCI bus clock frequency (in MHz)");
489 static int ide_set_dev_param_mask(const char *s
, struct kernel_param
*kp
)
492 unsigned int *dev_param_mask
= (unsigned int *)kp
->arg
;
494 if (sscanf(s
, "%d.%d:%d", &a
, &b
, &j
) != 3 &&
495 sscanf(s
, "%d.%d", &a
, &b
) != 2)
498 i
= a
* MAX_DRIVES
+ b
;
500 if (i
>= MAX_HWIFS
* MAX_DRIVES
|| j
< 0 || j
> 1)
504 *dev_param_mask
|= (1 << i
);
506 *dev_param_mask
&= (1 << i
);
511 static unsigned int ide_nodma
;
513 module_param_call(nodma
, ide_set_dev_param_mask
, NULL
, &ide_nodma
, 0);
514 MODULE_PARM_DESC(nodma
, "disallow DMA for a device");
516 static unsigned int ide_noflush
;
518 module_param_call(noflush
, ide_set_dev_param_mask
, NULL
, &ide_noflush
, 0);
519 MODULE_PARM_DESC(noflush
, "disable flush requests for a device");
521 static unsigned int ide_noprobe
;
523 module_param_call(noprobe
, ide_set_dev_param_mask
, NULL
, &ide_noprobe
, 0);
524 MODULE_PARM_DESC(noprobe
, "skip probing for a device");
526 static unsigned int ide_nowerr
;
528 module_param_call(nowerr
, ide_set_dev_param_mask
, NULL
, &ide_nowerr
, 0);
529 MODULE_PARM_DESC(nowerr
, "ignore the ATA_DF bit for a device");
531 static unsigned int ide_cdroms
;
533 module_param_call(cdrom
, ide_set_dev_param_mask
, NULL
, &ide_cdroms
, 0);
534 MODULE_PARM_DESC(cdrom
, "force device as a CD-ROM");
542 static unsigned int ide_disks
;
543 static struct chs_geom ide_disks_chs
[MAX_HWIFS
* MAX_DRIVES
];
545 static int ide_set_disk_chs(const char *str
, struct kernel_param
*kp
)
547 int a
, b
, c
= 0, h
= 0, s
= 0, i
, j
= 1;
549 if (sscanf(str
, "%d.%d:%d,%d,%d", &a
, &b
, &c
, &h
, &s
) != 5 &&
550 sscanf(str
, "%d.%d:%d", &a
, &b
, &j
) != 3)
553 i
= a
* MAX_DRIVES
+ b
;
555 if (i
>= MAX_HWIFS
* MAX_DRIVES
|| j
< 0 || j
> 1)
558 if (c
> INT_MAX
|| h
> 255 || s
> 255)
562 ide_disks
|= (1 << i
);
564 ide_disks
&= (1 << i
);
566 ide_disks_chs
[i
].cyl
= c
;
567 ide_disks_chs
[i
].head
= h
;
568 ide_disks_chs
[i
].sect
= s
;
573 module_param_call(chs
, ide_set_disk_chs
, NULL
, NULL
, 0);
574 MODULE_PARM_DESC(chs
, "force device as a disk (using CHS)");
576 static void ide_dev_apply_params(ide_drive_t
*drive
, u8 unit
)
578 int i
= drive
->hwif
->index
* MAX_DRIVES
+ unit
;
580 if (ide_nodma
& (1 << i
)) {
581 printk(KERN_INFO
"ide: disallowing DMA for %s\n", drive
->name
);
582 drive
->dev_flags
|= IDE_DFLAG_NODMA
;
584 if (ide_noflush
& (1 << i
)) {
585 printk(KERN_INFO
"ide: disabling flush requests for %s\n",
587 drive
->dev_flags
|= IDE_DFLAG_NOFLUSH
;
589 if (ide_noprobe
& (1 << i
)) {
590 printk(KERN_INFO
"ide: skipping probe for %s\n", drive
->name
);
591 drive
->dev_flags
|= IDE_DFLAG_NOPROBE
;
593 if (ide_nowerr
& (1 << i
)) {
594 printk(KERN_INFO
"ide: ignoring the ATA_DF bit for %s\n",
596 drive
->bad_wstat
= BAD_R_STAT
;
598 if (ide_cdroms
& (1 << i
)) {
599 printk(KERN_INFO
"ide: forcing %s as a CD-ROM\n", drive
->name
);
600 drive
->dev_flags
|= IDE_DFLAG_PRESENT
;
601 drive
->media
= ide_cdrom
;
602 /* an ATAPI device ignores DRDY */
603 drive
->ready_stat
= 0;
605 if (ide_disks
& (1 << i
)) {
606 drive
->cyl
= drive
->bios_cyl
= ide_disks_chs
[i
].cyl
;
607 drive
->head
= drive
->bios_head
= ide_disks_chs
[i
].head
;
608 drive
->sect
= drive
->bios_sect
= ide_disks_chs
[i
].sect
;
610 printk(KERN_INFO
"ide: forcing %s as a disk (%d/%d/%d)\n",
612 drive
->cyl
, drive
->head
, drive
->sect
);
614 drive
->dev_flags
|= IDE_DFLAG_FORCED_GEOM
| IDE_DFLAG_PRESENT
;
615 drive
->media
= ide_disk
;
616 drive
->ready_stat
= ATA_DRDY
;
620 static unsigned int ide_ignore_cable
;
622 static int ide_set_ignore_cable(const char *s
, struct kernel_param
*kp
)
626 if (sscanf(s
, "%d:%d", &i
, &j
) != 2 && sscanf(s
, "%d", &i
) != 1)
629 if (i
>= MAX_HWIFS
|| j
< 0 || j
> 1)
633 ide_ignore_cable
|= (1 << i
);
635 ide_ignore_cable
&= (1 << i
);
640 module_param_call(ignore_cable
, ide_set_ignore_cable
, NULL
, NULL
, 0);
641 MODULE_PARM_DESC(ignore_cable
, "ignore cable detection");
643 void ide_port_apply_params(ide_hwif_t
*hwif
)
647 if (ide_ignore_cable
& (1 << hwif
->index
)) {
648 printk(KERN_INFO
"ide: ignoring cable detection for %s\n",
650 hwif
->cbl
= ATA_CBL_PATA40_SHORT
;
653 for (i
= 0; i
< MAX_DRIVES
; i
++)
654 ide_dev_apply_params(&hwif
->drives
[i
], i
);
658 * This is gets invoked once during initialization, to set *everything* up
660 static int __init
ide_init(void)
664 printk(KERN_INFO
"Uniform Multi-Platform E-IDE driver\n");
666 ret
= bus_register(&ide_bus_type
);
668 printk(KERN_WARNING
"IDE: bus_register error: %d\n", ret
);
672 ide_port_class
= class_create(THIS_MODULE
, "ide_port");
673 if (IS_ERR(ide_port_class
)) {
674 ret
= PTR_ERR(ide_port_class
);
683 bus_unregister(&ide_bus_type
);
688 static void __exit
ide_exit(void)
692 class_destroy(ide_port_class
);
694 bus_unregister(&ide_bus_type
);
697 module_init(ide_init
);
698 module_exit(ide_exit
);
700 MODULE_LICENSE("GPL");