diff options
| author | Aleksey Gorelov <Aleksey_Gorelov@Phoenix.com> | 2005-06-23 09:08:29 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-23 18:45:11 +0200 |
| commit | 80bb82afea9eeb94ae3bfed418d079930da5d3b3 (patch) | |
| tree | bc02d1f85c2c3c227b9cfbef51d708f988b71156 /arch/i386/pci | |
| parent | [PATCH] x86: avoid wasting IRQs for PCI devices (diff) | |
| download | linux-80bb82afea9eeb94ae3bfed418d079930da5d3b3.tar.xz linux-80bb82afea9eeb94ae3bfed418d079930da5d3b3.zip | |
[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>
Diffstat (limited to 'arch/i386/pci')
| -rw-r--r-- | arch/i386/pci/irq.c | 22 |
1 files changed, 22 insertions, 0 deletions
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 @@ -227,6 +227,24 @@ static int pirq_via_set(struct pci_dev *router, struct pci_dev *dev, int pirq, i } /* + * 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 @@ -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: |