From: "Aleksey Gorelov" 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 Signed-off-by: Aleksey Gorelov Signed-off-by: Andrew Morton --- arch/i386/pci/irq.c | 22 ++++++++++++++++++++++ 1 files changed, 22 insertions(+) diff -puN arch/i386/pci/irq.c~via-82c586b-irq-routing-fix arch/i386/pci/irq.c --- 25/arch/i386/pci/irq.c~via-82c586b-irq-routing-fix 2005-05-24 23:52:14.000000000 -0700 +++ 25-akpm/arch/i386/pci/irq.c 2005-05-24 23:52:14.000000000 -0700 @@ -250,6 +250,24 @@ static int pirq_via_set(struct pci_dev * } /* + * 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 }, * 2+3 are both mapped to irq 9 on my system @@ -535,6 +553,10 @@ static __init int via_router_probe(struc 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: _