1 files changed, 22 insertions, 0 deletions

diff --git a/arch/x86/kernel/geode_32.c b/arch/x86/kernel/geode_32.c
index 9dad6ca6cd70..9b08e852fd1a 100644
--- a/arch/x86/kernel/geode_32.c
+++ b/arch/x86/kernel/geode_32.c
@@ -161,6 +161,28 @@ void geode_gpio_setup_event(unsigned int gpio, int pair, int pme)
 }
 EXPORT_SYMBOL_GPL(geode_gpio_setup_event);
 
+int geode_has_vsa2(void)
+{
+        static int has_vsa2 = -1;
+
+        if (has_vsa2 == -1) {
+                u16 val;
+
+                /*
+                 * The VSA has virtual registers that we can query for a
+                 * signature.
+                 */
+                outw(VSA_VR_UNLOCK, VSA_VRC_INDEX);
+                outw(VSA_VR_SIGNATURE, VSA_VRC_INDEX);
+
+                val = inw(VSA_VRC_DATA);
+                has_vsa2 = (val == AMD_VSA_SIG || val == GSW_VSA_SIG);
+        }
+
+        return has_vsa2;
+}
+EXPORT_SYMBOL_GPL(geode_has_vsa2);
+
 static int __init geode_southbridge_init(void)
 {
         if (!is_geode())