summaryrefslogtreecommitdiff
path: root/arch/x86/kernel/geode_32.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/kernel/geode_32.c')
-rw-r--r--arch/x86/kernel/geode_32.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/x86/kernel/geode_32.c b/arch/x86/kernel/geode_32.c
index 9dad6ca6cd7..e8edd63ab00 100644
--- a/arch/x86/kernel/geode_32.c
+++ b/arch/x86/kernel/geode_32.c
@@ -161,6 +161,25 @@ 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) {
+ /*
+ * 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);
+
+ has_vsa2 = (inw(VSA_VRC_DATA) == VSA_SIG);
+ }
+
+ return has_vsa2;
+}
+EXPORT_SYMBOL_GPL(geode_has_vsa2);
+
static int __init geode_southbridge_init(void)
{
if (!is_geode())