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Date:	Tue, 24 May 2005 09:29:29 +0200

From: Karsten Keil <kkeil@suse.de>
To: Aleksey Gorelov <Aleksey_Gorelov@Phoenix.com>
Cc: Ondrej Zary <linux@rainbow-software.org>,
	linux-kernel@vger.kernel.org, Andrew Morton <akpm@osdl.org>,
	jgarzik@pobox.com
Subject: Re: [PATCH] bug in VIA PCI IRQ routing

Message-ID: <20050524072929.GD22182@pingi3.kke.suse.de>

Mail-Followup-To: Aleksey Gorelov <Aleksey_Gorelov@Phoenix.com>,
	Ondrej Zary <linux@rainbow-software.org>,
	linux-kernel@vger.kernel.org, Andrew Morton <akpm@osdl.org>,
	jgarzik@pobox.com
References: <0EF82802ABAA22479BC1CE8E2F60E8C31B4902@scl-exch2k3.phoenix.com>

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Organization: SuSE Linux AG

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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
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