soc/intel/tigerlake: Send End-of-Post message to CSE

This is done to ensure the CSE will not execute any pre-boot commands
after it receives this command. Verified EOP and error recovery sequence
from Intel doc#612229

Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Change-Id: Iae6b2eac11c065749e57c5337d81ed20044fc903
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55632
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/intel/tigerlake/Kconfig

@@ -72,6 +72,7 @@ config CPU_SPECIFIC_OPTIONS
 	select SOC_INTEL_COMMON_PCH_BASE
 	select SOC_INTEL_COMMON_RESET
 	select SOC_INTEL_COMMON_BLOCK_POWER_LIMIT
+	select SOC_INTEL_CSE_SET_EOP
 	select SSE2
 	select SUPPORT_CPU_UCODE_IN_CBFS
 	select TSC_MONOTONIC_TIMER

src/soc/intel/tigerlake/fsp_params.c

@@ -43,10 +43,10 @@
  * 2 - Send in DXE (Not applicable for FSP in API mode)
  */
 enum {
-	EOP_DISABLE,
-	EOP_PEI,
-	EOP_DXE,
-} EndOfPost;
+	EOP_DISABLE = 0,
+	EOP_PEI = 1,
+	EOP_DXE = 2,
+};
 
 /*
  * Chip config parameter PcieRpL1Substates uses (UPD value + 1)
@@ -403,8 +403,8 @@ void platform_fsp_silicon_init_params_cb(FSPS_UPD *supd)
 		params->RtcMemoryLock = 1;
 	}
 
-	/* Enable End of Post in PEI phase */
-	params->EndOfPostMessage = EOP_PEI;
+	/* coreboot will send EOP before loading payload */
+	params->EndOfPostMessage = EOP_DISABLE;
 
 	/* USB */
 	for (i = 0; i < ARRAY_SIZE(config->usb2_ports); i++) {