From 80bb82afea9eeb94ae3bfed418d079930da5d3b3 Mon Sep 17 00:00:00 2001 From: Aleksey Gorelov Date: Thu, 23 Jun 2005 00:08:29 -0700 Subject: [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 Signed-off-by: Aleksey Gorelov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/i386/pci/irq.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'arch/i386') diff --git a/arch/i386/pci/irq.c b/arch/i386/pci/irq.c index da21b1d07c15..83458f81e661 100644 --- a/arch/i386/pci/irq.c +++ b/arch/i386/pci/irq.c @@ -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: -- cgit v1.2.3