From 15109603c6fdd3b4a9c2668c4f6d81bef71ccdd8 Mon Sep 17 00:00:00 2001
From: Patrick Rudolph <patrick.rudolph@9elements.com>
Date: Thu, 5 Dec 2024 10:01:55 +0100
Subject: [PATCH] mainboard/ocp/tiogapass: Enable TPM

Add support for the optional TPM. When GPP_A22 is low a TPM is
installed.

TEST: Found a working TPM 2.0 SLB9670 on ocp/tiogapass.

Change-Id: I970033981a265eb0094bc91fc070487b34972a5a
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85510
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
---
 src/mainboard/ocp/tiogapass/Kconfig       |  2 ++
 src/mainboard/ocp/tiogapass/devicetree.cb |  3 +++
 src/mainboard/ocp/tiogapass/ramstage.c    | 12 ++++++++++++
 3 files changed, 17 insertions(+)

diff --git a/src/mainboard/ocp/tiogapass/Kconfig b/src/mainboard/ocp/tiogapass/Kconfig
index 8bf7e799b0..a1ff82f79a 100644
--- a/src/mainboard/ocp/tiogapass/Kconfig
+++ b/src/mainboard/ocp/tiogapass/Kconfig
@@ -14,6 +14,8 @@ config BOARD_SPECIFIC_OPTIONS
 	select SOC_INTEL_SKYLAKE_SP
 	select SUPERIO_ASPEED_AST2400
 	select UART_OVERRIDE_BAUDRATE
+	select MEMORY_MAPPED_TPM
+	select MAINBOARD_HAS_TPM2
 	select MAINBOARD_USES_IFD_GBE_REGION
 	select MAINBOARD_USES_IFD_10GBE_0_REGION
 	select VPD
diff --git a/src/mainboard/ocp/tiogapass/devicetree.cb b/src/mainboard/ocp/tiogapass/devicetree.cb
index 37e740a4c0..427694a149 100644
--- a/src/mainboard/ocp/tiogapass/devicetree.cb
+++ b/src/mainboard/ocp/tiogapass/devicetree.cb
@@ -82,6 +82,9 @@ chip soc/intel/xeon_sp/skx
 			chip drivers/ipmi/ocp # OCP specific IPMI porting
 				device pnp ca2.1 on end
 			end
+			chip drivers/pc80/tpm	# TPM
+				device pnp 0c31.0 alias tpm on end
+			end
 		end # Intel Corporation C621 Series Chipset LPC/eSPI Controller
 		device pci 1f.1 hidden end # p2sb
 		device pci 1f.2 on end # Intel Corporation C620 Series Chipset Family Power Management Controller
diff --git a/src/mainboard/ocp/tiogapass/ramstage.c b/src/mainboard/ocp/tiogapass/ramstage.c
index a07edb80e8..fbc5e92913 100644
--- a/src/mainboard/ocp/tiogapass/ramstage.c
+++ b/src/mainboard/ocp/tiogapass/ramstage.c
@@ -3,8 +3,10 @@
 #include <cpu/x86/smm.h>
 #include <drivers/ipmi/ipmi_ops.h>
 #include <drivers/ocp/dmi/ocp_dmi.h>
+#include <gpio.h>
 #include <soc/ramstage.h>
 #include <soc/smmrelocate.h>
+#include <static.h>
 
 extern struct fru_info_str fru_strings;
 
@@ -165,8 +167,18 @@ static void tp_oem_smbios_strings(struct device *dev, struct smbios_type11 *t)
 		t->count = smbios_add_oem_string(t->eos, TBF);
 }
 
+WEAK_DEV_PTR(tpm);
+
 static void mainboard_enable(struct device *dev)
 {
+	struct device *tpm = DEV_PTR(tpm);
+
+	gpio_input(GPP_A22);
+	if (tpm)
+		tpm->enabled = !gpio_get(GPP_A22);
+
+	printk(BIOS_DEBUG, "TPM present: %d\n", !gpio_get(GPP_A22));
+
 	dev->ops->get_smbios_strings = tp_oem_smbios_strings;
 	read_fru_areas(CONFIG_BMC_KCS_BASE, CONFIG_FRU_DEVICE_ID, 0, &fru_strings);
 #if CONFIG(GENERATE_SMBIOS_TABLES)