Hi Marcelo, Attached comes appropriate patch for 2.4 Signed-off-by: Aleksey Gorelov <[email protected]> Previously posted patch for 2.6 had been verified by Karsten Keil <[email protected]>. According to the VIA 82C586B datasheet (still available from http://gkernel.sourceforge.net/specs/via/586b.pdf.bz2) this chip needs a special PIRQ mapping. Again, according to appropriate datasheets, 82C596, 82C686 & 8231 should continue utilize old scheme. >-----Original Message----- >From: Karsten Keil [mailto:[email protected]] >Sent: Tuesday, May 24, 2005 12:29 AM >To: Aleksey Gorelov >Cc: Ondrej Zary; [email protected]; Andrew Morton; >[email protected] >Subject: Re: [PATCH] bug in VIA PCI IRQ routing > >Hi, > >On Mon, May 23, 2005 at 12:53:41PM -0700, Aleksey Gorelov wrote: >> >> Karsten, >> >> could you please verify if attached patch works for you ? > >Works and seems to be OK, according to the specs. So this >patch should go into the kernel, also into 2.4 I think. >These chipset is still used on small special purpose systems. > >--- linux-2.6.11.10/arch/i386/pci/irq.c 2005-05-16 >10:50:30.000000000 -0700 >+++ new/arch/i386/pci/irq.c 2005-05-23 12:47:19.000000000 -0700 >@@ -227,6 +227,24 @@ > } > > /* >+ * 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 >@@ -509,6 +527,10 @@ > 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: > >-- >Karsten Keil >SuSE Labs >ISDN development >
Attachment:
via24.patch
Description: via24.patch
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