[PATCH] VIA 82C586B IRQ routing fix
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>
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@ -226,6 +226,24 @@ static int pirq_via_set(struct pci_dev *router, struct pci_dev *dev, int pirq, i
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return 1;
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}
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/*
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* The VIA pirq rules are nibble-based, like ALI,
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* but without the ugly irq number munging.
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* However, for 82C586, nibble map is different .
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*/
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static int pirq_via586_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
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{
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static unsigned int pirqmap[4] = { 3, 2, 5, 1 };
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return read_config_nybble(router, 0x55, pirqmap[pirq-1]);
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}
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static int pirq_via586_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
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{
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static unsigned int pirqmap[4] = { 3, 2, 5, 1 };
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write_config_nybble(router, 0x55, pirqmap[pirq-1], irq);
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return 1;
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}
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/*
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* ITE 8330G pirq rules are nibble-based
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* FIXME: pirqmap may be { 1, 0, 3, 2 },
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@ -512,6 +530,10 @@ static __init int via_router_probe(struct irq_router *r, struct pci_dev *router,
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switch(device)
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{
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case PCI_DEVICE_ID_VIA_82C586_0:
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r->name = "VIA";
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r->get = pirq_via586_get;
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r->set = pirq_via586_set;
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return 1;
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case PCI_DEVICE_ID_VIA_82C596:
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case PCI_DEVICE_ID_VIA_82C686:
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case PCI_DEVICE_ID_VIA_8231:
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