diff --git a/src/soc/intel/tigerlake/include/soc/tcss.h b/src/soc/intel/tigerlake/include/soc/tcss.h
index 713528bdbb..014e3076e6 100644
--- a/src/soc/intel/tigerlake/include/soc/tcss.h
+++ b/src/soc/intel/tigerlake/include/soc/tcss.h
@@ -3,6 +3,10 @@
 #ifndef _SOC_TCSS_H_
 #define _SOC_TCSS_H_
 
+/* Thunderbolt firmware IMR status */
+#define IOM_CSME_IMR_TBT_STATUS			0x14
+#define TBT_VALID_AUTHENTICATION		(1 << 30)
+
 /* IOM aux bias control registers in REGBAR MMIO space */
 #define IOM_AUX_BIAS_CTRL_PULLUP_OFFSET_0	0x1070
 #define IOM_AUX_BIAS_CTRL_PULLUP_OFFSET(x)	(IOM_AUX_BIAS_CTRL_PULLUP_OFFSET_0 + (x) * 4)