ide: add "ignore_cable" parameter (take 2)

Add "ignore_cable" parameter:

* "ide_core.ignore_cable=[interface_number]" boot option if IDE is built-in
  (i.e. "ide_core.ignore_cable=1" to force ignoring cable for "ide1")

* "ignore_cable=[interface_number]" module parameter (for ide_core module)
  if IDE is compiled as module

v2:
* Add ide_port_apply_params() helper
  - use it in ide_device_add_all() and ide_scan_port().

* Make it possible to later disable ignoring cable detection by passing
  "[interface_number]:0" to /sys/module/ide_core/parameters/ignore_cable
  (however sysfs interface is not enabled yet since it needs some other
   IDE changes to make it work reliable).

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2008-04-27 15:38:23 +02:00
parent 9c391bae6a
commit 9fd91d959f
4 changed files with 53 additions and 6 deletions

View File

@ -224,11 +224,6 @@ Summary of ide driver parameters for kernel command line
"idex=reset" : reset interface after probe
"idex=ata66" : informs the interface that it has an 80c cable
for chipsets that are ATA-66 capable, but the
ability to bit test for detection is currently
unknown.
"ide=doubler" : probe/support IDE doublers on Amiga
There may be more options than shown -- use the source, Luke!
@ -251,6 +246,16 @@ 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).
To force ignoring cable detection (this should be needed only if you're using
short 40-wires cable which cannot be automatically detected - if this is not
a case please report it as a bug instead) use "ignore_cable" kernel parameter:
* "ide_core.ignore_cable=[interface_number]" boot option if IDE is built-in
(i.e. "ide_core.ignore_cable=1" to force ignoring cable for "ide1")
* "ignore_cable=[interface_number]" module parameter (for ide_core module)
if IDE is compiled as module
================================================================================
Some Terminology

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@ -1518,13 +1518,20 @@ int ide_device_add_all(u8 *idx, const struct ide_port_info *d)
int i, rc = 0;
for (i = 0; i < MAX_HWIFS; i++) {
if (d == NULL || idx[i] == 0xff) {
if (idx[i] == 0xff) {
mate = NULL;
continue;
}
hwif = &ide_hwifs[idx[i]];
ide_port_apply_params(hwif);
if (d == NULL) {
mate = NULL;
continue;
}
if (d->chipset != ide_etrax100 && (i & 1) && mate) {
hwif->mate = mate;
mate->mate = hwif;
@ -1621,6 +1628,7 @@ EXPORT_SYMBOL_GPL(ide_device_add);
void ide_port_scan(ide_hwif_t *hwif)
{
ide_port_apply_params(hwif);
ide_port_cable_detect(hwif);
ide_port_init_devices(hwif);

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@ -1239,6 +1239,38 @@ static void ide_port_class_release(struct device *portdev)
put_device(&hwif->gendev);
}
static unsigned int ide_ignore_cable;
static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
{
int i, j = 1;
if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
return -EINVAL;
if (i >= MAX_HWIFS || j < 0 || j > 1)
return -EINVAL;
if (j)
ide_ignore_cable |= (1 << i);
else
ide_ignore_cable &= (1 << i);
return 0;
}
module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
void ide_port_apply_params(ide_hwif_t *hwif)
{
if (ide_ignore_cable & (1 << hwif->index)) {
printk(KERN_INFO "ide: ignoring cable detection for %s\n",
hwif->name);
hwif->cbl = ATA_CBL_PATA40_SHORT;
}
}
/*
* This is gets invoked once during initialization, to set *everything* up
*/

View File

@ -1222,6 +1222,8 @@ void ide_unregister_region(struct gendisk *);
void ide_undecoded_slave(ide_drive_t *);
void ide_port_apply_params(ide_hwif_t *);
int ide_device_add_all(u8 *idx, const struct ide_port_info *);
int ide_device_add(u8 idx[4], const struct ide_port_info *);
int ide_legacy_device_add(const struct ide_port_info *, unsigned long);