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ide: add ide-4drives host driver (take 3)

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CONFIG_BLK_DEV_4DRIVES deserves its own host driver:

* Add drivers/ide/legacy/ide-4drives.c and move "4drives" support there.

* Add ide-4drives.o in the link order after all other legacy host
  drivers enabled by "ide0=" options (they all are mutually exclusive).

* Make ide-4drives host driver probe itself for IDE devices instead of
  indirectly depending on ide_generic host driver.

* Add "probe" module parameter to ide-4drives and update documentation.

v2:
* s/paramater/parameter/ in ide.txt. (Noticed by Randy Dunlap)

v3:
* s/ide_4drives.probe/ide-4drives.probe/ in help entry.
  (Noticed by Sergei Shtylyov)

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2008-04-18 00:46:34 +02:00
parent 26d799b729
commit ffd4f6f0ee
5 changed files with 55 additions and 16 deletions
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5
Documentation/ide/ide.txt
View file

@ -222,8 +222,6 @@ Summary of ide driver parameters for kernel command line
both the respective primary and secondary channel
to take effect.
"idex=four" : four drives on idex and ide(x^1) share same ports
"idex=reset" : reset interface after probe
"idex=ata66" : informs the interface that it has an 80c cable
@ -250,6 +248,9 @@ Also for legacy CMD640 host driver (cmd640) you need to use "probe_vlb"
kernel paremeter to enable probing for VLB version of the chipset (PCI ones
are detected automatically).
You also need to use "probe" kernel parameter for ide-4drives driver
(support for IDE generic chipset with four drives on one port).
================================================================================
Some Terminology

4
drivers/ide/Kconfig
View file

@ -1035,8 +1035,8 @@ config BLK_DEV_4DRIVES
Certain older chipsets, including the Tekram 690CD, use a single set
of I/O ports at 0x1f0 to control up to four drives, instead of the
customary two drives per port. Support for this can be enabled at
runtime using the "ide0=four" kernel boot parameter if you say Y
here.
runtime using the "ide-4drives.probe" kernel boot parameter if you
say Y here.
config BLK_DEV_ALI14XX
tristate "ALI M14xx support"

15
drivers/ide/ide.c
View file

@ -976,6 +976,7 @@ extern int probe_dtc2278;
extern int probe_ht6560b;
extern int probe_qd65xx;
extern int cmd640_vlb;
extern int probe_4drives;
static int __initdata is_chipset_set;
@ -1187,19 +1188,9 @@ static int __init ide_setup(char *s)
#endif
#ifdef CONFIG_BLK_DEV_4DRIVES
case -11: /* "four" drives on one set of ports */
{
ide_hwif_t *mate = &ide_hwifs[hw^1];
mate->drives[0].select.all ^= 0x20;
mate->drives[1].select.all ^= 0x20;
hwif->chipset = mate->chipset = ide_4drives;
mate->irq = hwif->irq;
memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
hwif->mate = mate;
mate->mate = hwif;
hwif->serialized = mate->serialized = 1;
probe_4drives = 1;
goto obsolete_option;
}
#endif /* CONFIG_BLK_DEV_4DRIVES */
#endif
case -10: /* minus10 */
case -9: /* minus9 */
case -8: /* minus8 */

1
drivers/ide/legacy/Makefile
View file

@ -6,6 +6,7 @@ obj-$(CONFIG_BLK_DEV_UMC8672) += umc8672.o
obj-$(CONFIG_BLK_DEV_DTC2278) += dtc2278.o
obj-$(CONFIG_BLK_DEV_HT6560B) += ht6560b.o
obj-$(CONFIG_BLK_DEV_QD65XX) += qd65xx.o
obj-$(CONFIG_BLK_DEV_4DRIVES) += ide-4drives.o
obj-$(CONFIG_BLK_DEV_GAYLE) += gayle.o
obj-$(CONFIG_BLK_DEV_FALCON_IDE) += falconide.o

46
drivers/ide/legacy/ide-4drives.c Normal file
View file

@ -0,0 +1,46 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/ide.h>
int probe_4drives = 0;
module_param_named(probe, probe_4drives, bool, 0);
MODULE_PARM_DESC(probe, "probe for generic IDE chipset with 4 drives/port");
static int __init ide_4drives_init(void)
{
ide_hwif_t *hwif, *mate;
u8 idx[4] = { 0, 1, 0xff, 0xff };
if (probe_4drives == 0)
return -ENODEV;
hwif = &ide_hwifs[0];
mate = &ide_hwifs[1];
memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
mate->irq = hwif->irq;
mate->chipset = hwif->chipset = ide_4drives;
mate->drives[0].select.all ^= 0x20;
mate->drives[1].select.all ^= 0x20;
hwif->mate = mate;
mate->mate = hwif;
hwif->serialized = mate->serialized = 1;
ide_device_add(idx, NULL);
return 0;
}
module_init(ide_4drives_init);
MODULE_AUTHOR("Bartlomiej Zolnierkiewicz");
MODULE_DESCRIPTION("generic IDE chipset with 4 drives/port support");
MODULE_LICENSE("GPL");