4 files changed, 48 insertions, 0 deletions
diff --git a/src/soc/amd/common/block/include/amdblocks/psp.h b/src/soc/amd/common/block/include/amdblocks/psp.h
index c9986cae00..abdb762af8 100644
--- a/src/soc/amd/common/block/include/amdblocks/psp.h
+++ b/src/soc/amd/common/block/include/amdblocks/psp.h
@@ -75,4 +75,7 @@ void psp_notify_sx_info(u8 sleep_type);
 
 int psp_load_named_blob(enum psp_blob_type type, const char *name);
 
+/* Sets the GPIO used for the TPM IRQ */
+void psp_set_tpm_irq_gpio(unsigned int gpio);
+
 #endif /* AMD_BLOCK_PSP_H */
diff --git a/src/soc/amd/common/block/psp/Makefile.inc b/src/soc/amd/common/block/psp/Makefile.inc
index 5dd7fdd941..c3b0161514 100644
--- a/src/soc/amd/common/block/psp/Makefile.inc
+++ b/src/soc/amd/common/block/psp/Makefile.inc
@@ -23,6 +23,7 @@ ifeq ($(CONFIG_SOC_AMD_COMMON_BLOCK_PSP_GEN2),y)
 romstage-y += psp_gen2.c
 ramstage-y += psp_gen2.c
 ramstage-$(CONFIG_PSP_PLATFORM_SECURE_BOOT) += psb.c
+ramstage-$(CONFIG_SOC_AMD_COMMON_BLOCK_I2C3_TPM_SHARED_WITH_PSP) += tpm.c
 
 smm-y += psp_gen2.c
 smm-y += psp_smm_gen2.c
diff --git a/src/soc/amd/common/block/psp/psp_def.h b/src/soc/amd/common/block/psp/psp_def.h
index 6dcf5b48dc..1d87878c03 100644
--- a/src/soc/amd/common/block/psp/psp_def.h
+++ b/src/soc/amd/common/block/psp/psp_def.h
@@ -20,6 +20,7 @@
 #define MBOX_BIOS_CMD_PSB_AUTO_FUSING		0x21
 #define MBOX_BIOS_CMD_SET_SPL_FUSE		0x2d
 #define MBOX_BIOS_CMD_QUERY_SPL_FUSE		0x47
+#define MBOX_BIOS_CMD_I2C_TPM_ARBITRATION	0x64
 #define MBOX_BIOS_CMD_ABORT			0xfe
 
 /* x86 to PSP commands, v1-only */
@@ -81,6 +82,23 @@ struct mbox_cmd_late_spl_buffer {
 	uint32_t	spl_value;
 } __attribute__((packed, aligned(32)));
 
+struct dtpm_config {
+	uint32_t gpio;
+} __packed;
+
+enum dtpm_request_type {
+	DTPM_REQUEST_ACQUIRE,	/* Acquire I2C bus */
+	DTPM_REQUEST_RELEASE,	/* Release I2C bus */
+	DTPM_REQUEST_CONFIG,	/* Provide DTPM info */
+	DTPM_REQUEST_MAX,
+};
+
+struct mbox_cmd_dtpm_config_buffer {
+	struct mbox_buffer_header header;
+	uint32_t request_type;
+	struct dtpm_config config;
+} __packed __aligned(32);
+
 #define PSP_INIT_TIMEOUT 10000 /* 10 seconds */
 #define PSP_CMD_TIMEOUT 1000 /* 1 second */
 
diff --git a/src/soc/amd/common/block/psp/tpm.c b/src/soc/amd/common/block/psp/tpm.c
new file mode 100644
index 0000000000..3fd50ea6be
--- /dev/null
+++ b/src/soc/amd/common/block/psp/tpm.c
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <amdblocks/psp.h>
+#include <console/console.h>
+#include <types.h>
+#include "psp_def.h"
+
+void psp_set_tpm_irq_gpio(unsigned int gpio)
+{
+	int cmd_status;
+	struct mbox_cmd_dtpm_config_buffer buffer = {
+		.header = {
+			.size = sizeof(buffer)
+		},
+		.request_type = DTPM_REQUEST_CONFIG,
+		.config = {
+			.gpio = gpio
+		}
+	};
+
+	printk(BIOS_DEBUG, "PSP: Setting TPM GPIO to %u...", gpio);
+
+	cmd_status = send_psp_command(MBOX_BIOS_CMD_I2C_TPM_ARBITRATION, &buffer);
+
+	psp_print_cmd_status(cmd_status, &buffer.header);
+}