Add DEBUG_TPM option to Debugging menu

instead of having to edit the source code of tpm.c

Change-Id: I519d9ada14dd383e668a2da4219e5373a24c7c3d
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/757
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/Kconfig

@@ -862,6 +862,13 @@ config X86EMU_DEBUG_IO
 
 	  If unsure, say N.
 
+config DEBUG_TPM
+	bool "Output verbose TPM debug messages"
+	default n
+	depends on TPM
+	help
+	  This option enables additional TPM related debug messages.
+
 config LLSHELL
 	bool "Built-in low-level shell"
 	default n

src/pc80/tpm.c

@@ -27,7 +27,6 @@
  * Infineon slb9635), so this driver provides access to locality 0 only.
  */
 
-/* #define DEBUG */
 #include <stdlib.h>
 #include <string.h>
 #include <delay.h>
@@ -37,17 +36,11 @@
 #include <pc80/tpm.h>
 #include <cpu/x86/car.h>
 
-#ifdef DEBUG
-#define TPM_DEBUG_ON	1
-#else
-#define TPM_DEBUG_ON	0
-#endif
-
 #define PREFIX "lpc_tpm: "
 
 /* coreboot wrapper for TPM driver (start) */
 #define	TPM_DEBUG(fmt, args...)		\
-	if (TPM_DEBUG_ON) {		\
+	if (CONFIG_DEBUG_TPM) {		\
 		printk(BIOS_DEBUG, PREFIX);		\
 		printk(BIOS_DEBUG, fmt , ##args);	\
 	}