x86, hpet: SB600 - remove HPET resources from PCI device

Prevent the HPET resources from appearing in PCI device 14.0 which
confuses the PCI resource engine.

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 28 insertions, 0 deletions

diff --git a/arch/x86/pci/fixup.c b/arch/x86/pci/fixup.c
index 4bdaa590375d..3c27a809393b 100644
--- a/arch/x86/pci/fixup.c
+++ b/arch/x86/pci/fixup.c
@@ -511,3 +511,31 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, 0x1201, fam10h_pci_cfg_space_size);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, 0x1202, fam10h_pci_cfg_space_size);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, 0x1203, fam10h_pci_cfg_space_size);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_AMD, 0x1204, fam10h_pci_cfg_space_size);
+
+/*
+ * SB600: Disable BAR1 on device 14.0 to avoid HPET resources from
+ * confusing the PCI engine:
+ */
+static void sb600_disable_hpet_bar(struct pci_dev *dev)
+{
+        u8 val;
+
+        /*
+         * The SB600 and SB700 both share the same device
+         * ID, but the PM register 0x55 does something different
+         * for the SB700, so make sure we are dealing with the
+         * SB600 before touching the bit:
+         */
+
+        pci_read_config_byte(dev, 0x08, &val);
+
+        if (val < 0x2F) {
+                outb(0x55, 0xCD6);
+                val = inb(0xCD7);
+
+                /* Set bit 7 in PM register 0x55 */
+                outb(0x55, 0xCD6);
+                outb(val | 0x80, 0xCD7);
+        }
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_ATI, 0x4385, sb600_disable_hpet_bar);