1 files changed, 19 insertions, 0 deletions

diff --git a/include/asm-x86/geode.h b/include/asm-x86/geode.h
index b1bdf6378563..3978200f126c 100644
--- a/include/asm-x86/geode.h
+++ b/include/asm-x86/geode.h
@@ -103,6 +103,14 @@ extern int geode_get_dev_base(unsigned int dev);
 #define PM_AWKD                 0x50
 #define PM_SSC                  0x54
 
+/* VSA2 magic values */
+
+#define VSA_VRC_INDEX           0xAC1C
+#define VSA_VRC_DATA            0xAC1E
+#define VSA_VR_UNLOCK           0xFC53  /* unlock virtual register */
+#define VSA_VR_SIGNATURE        0x0003
+#define VSA_SIG                 0x4132  /* signature is ascii 'VSA2' */
+
 /* GPIO */
 
 #define GPIO_OUTPUT_VAL         0x00
@@ -174,6 +182,17 @@ static inline int is_geode(void)
         return (is_geode_gx() || is_geode_lx());
 }
 
+/*
+ * The VSA has virtual registers that we can query for a signature.
+ */
+static inline int geode_has_vsa2(void)
+{
+        outw(VSA_VR_UNLOCK, VSA_VRC_INDEX);
+        outw(VSA_VR_SIGNATURE, VSA_VRC_INDEX);
+
+        return (inw(VSA_VRC_DATA) == VSA_SIG);
+}
+
 /* MFGPTs */
 
 #define MFGPT_MAX_TIMERS        8