[patch] VIA VT8235 PCI quirk

[Ivan Kokshaysky]

Like many other southbridges from different manufacturers, VIA VT8235
chip has two non-standard BARs for power management and SMBus
registers (see the datasheet at http://www.via.com.tw).
This new quirk routine fixes boot problem with 2.6.13-rc2/rc6 kernels
on Targa Visionary 811 Athlon64 laptop, as reported by
Mikael Pettersson <mikpe@xxxxxxxxx>.

Signed-off-by: Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx>

--- 2.6.13-rc6/drivers/pci/quirks.c	Sun Aug  7 12:07:40 2005
+++ linux/drivers/pci/quirks.c	Sun Aug  7 14:37:14 2005
@@ -373,6 +373,25 @@ static void __devinit quirk_vt82c686_acp
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_82C686_4,	quirk_vt82c686_acpi );
 
+/*
+ * VIA VT8235 ISA Bridge: Two IO regions pointed to by words at
+ *	0x88 (128 bytes of power management registers)
+ *	0xd0 (16 bytes of SMB registers)
+ */
+static void __devinit quirk_vt8235_acpi(struct pci_dev *dev)
+{
+	u16 pm, smb;
+
+	pci_read_config_word(dev, 0x88, &pm);
+	pm &= PCI_BASE_ADDRESS_IO_MASK;
+	quirk_io_region(dev, pm, 128, PCI_BRIDGE_RESOURCES);
+
+	pci_read_config_word(dev, 0xd0, &smb);
+	smb &= PCI_BASE_ADDRESS_IO_MASK;
+	quirk_io_region(dev, smb, 16, PCI_BRIDGE_RESOURCES + 1);
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA,	PCI_DEVICE_ID_VIA_8235,	quirk_vt8235_acpi);
+
 
 #ifdef CONFIG_X86_IO_APIC 
 
-
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