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[PATCH] VIA 82C586B IRQ routing fix

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According to the VIA 82C586B datasheet (still available from
http://gkernel.sourceforge.net/specs/via/586b.pdf.bz2) this chip need a
special PIRQ mapping.

Signed-off-by: Karsten Keil <kkeil@suse.de>
Signed-off-by: Aleksey Gorelov <aleksey_gorelov@phoenix.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Aleksey Gorelov 2005-06-23 00:08:29 -07:00 committed by Linus Torvalds
parent c434b7a6ae
commit 80bb82afea
1 changed files with 22 additions and 0 deletions
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22
arch/i386/pci/irq.c
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@ -226,6 +226,24 @@ static int pirq_via_set(struct pci_dev *router, struct pci_dev *dev, int pirq, i
return 1;
}
/*
* The VIA pirq rules are nibble-based, like ALI,
* but without the ugly irq number munging.
* However, for 82C586, nibble map is different .
*/
static int pirq_via586_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
{
static unsigned int pirqmap[4] = { 3, 2, 5, 1 };
return read_config_nybble(router, 0x55, pirqmap[pirq-1]);
}
static int pirq_via586_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
{
static unsigned int pirqmap[4] = { 3, 2, 5, 1 };
write_config_nybble(router, 0x55, pirqmap[pirq-1], irq);
return 1;
}
/*
* ITE 8330G pirq rules are nibble-based
* FIXME: pirqmap may be { 1, 0, 3, 2 },
@ -512,6 +530,10 @@ static __init int via_router_probe(struct irq_router *r, struct pci_dev *router,
switch(device)
{
case PCI_DEVICE_ID_VIA_82C586_0:
r->name = "VIA";
r->get = pirq_via586_get;
r->set = pirq_via586_set;
return 1;
case PCI_DEVICE_ID_VIA_82C596:
case PCI_DEVICE_ID_VIA_82C686:
case PCI_DEVICE_ID_VIA_8231: