4 files changed, 58 insertions, 0 deletions
diff --git a/src/soc/amd/common/block/psp/Makefile.mk b/src/soc/amd/common/block/psp/Makefile.mk
index c16a73b698..b72343c365 100644
--- a/src/soc/amd/common/block/psp/Makefile.mk
+++ b/src/soc/amd/common/block/psp/Makefile.mk
@@ -5,6 +5,7 @@ romstage-y += psp.c
 ramstage-y += psp.c
 smm-y += psp.c
 smm-$(CONFIG_SOC_AMD_COMMON_BLOCK_PSP_SMI) += psp_smi.c
+smm-$(CONFIG_SOC_AMD_COMMON_BLOCK_PSP_SMI) += psp_smi_flash.c
 smm-y += psp_smm.c
 
 bootblock-y += psp_efs.c
diff --git a/src/soc/amd/common/block/psp/psp_def.h b/src/soc/amd/common/block/psp/psp_def.h
index d58aa0b82e..c2b2fca8d8 100644
--- a/src/soc/amd/common/block/psp/psp_def.h
+++ b/src/soc/amd/common/block/psp/psp_def.h
@@ -133,4 +133,9 @@ enum cb_err soc_read_c2p38(uint32_t *msg_38_value);
 
 void enable_psp_smi(void);
 
+enum mbox_p2c_status psp_smi_spi_get_info(struct mbox_default_buffer *buffer);
+enum mbox_p2c_status psp_smi_spi_read(struct mbox_default_buffer *buffer);
+enum mbox_p2c_status psp_smi_spi_write(struct mbox_default_buffer *buffer);
+enum mbox_p2c_status psp_smi_spi_erase(struct mbox_default_buffer *buffer);
+
 #endif /* __AMD_PSP_DEF_H__ */
diff --git a/src/soc/amd/common/block/psp/psp_smi.c b/src/soc/amd/common/block/psp/psp_smi.c
index e6cc1dc96c..66e84d13a6 100644
--- a/src/soc/amd/common/block/psp/psp_smi.c
+++ b/src/soc/amd/common/block/psp/psp_smi.c
@@ -8,6 +8,12 @@
 #include <types.h>
 #include "psp_def.h"
 
+/* PSP to x86 commands */
+#define MBOX_PSP_CMD_SPI_INFO		0x83
+#define MBOX_PSP_CMD_SPI_READ		0x84
+#define MBOX_PSP_CMD_SPI_WRITE		0x85
+#define MBOX_PSP_CMD_SPI_ERASE		0x86
+
 extern struct {
 	u8 buffer[P2C_BUFFER_MAXSIZE];
 }  __aligned(32) p2c_buffer;
@@ -126,6 +132,7 @@ static void handle_psp_command(void)
 {
 	enum mbox_p2c_status status;
 	u32 cmd;
+	struct mbox_default_buffer *const buffer = get_psp_command_buffer();
 
 	status = check_psp_command();
 	if (status != MBOX_PSP_SUCCESS)
@@ -134,6 +141,18 @@ static void handle_psp_command(void)
 	cmd = get_psp_command();
 
 	switch (cmd) {
+	case MBOX_PSP_CMD_SPI_INFO:
+		status = psp_smi_spi_get_info(buffer);
+		break;
+	case MBOX_PSP_CMD_SPI_READ:
+		status = psp_smi_spi_read(buffer);
+		break;
+	case MBOX_PSP_CMD_SPI_WRITE:
+		status = psp_smi_spi_write(buffer);
+		break;
+	case MBOX_PSP_CMD_SPI_ERASE:
+		status = psp_smi_spi_erase(buffer);
+		break;
 	default:
 		printk(BIOS_ERR, "PSP: Unknown command %d\n", cmd);
 		status = MBOX_PSP_UNSUPPORTED;
diff --git a/src/soc/amd/common/block/psp/psp_smi_flash.c b/src/soc/amd/common/block/psp/psp_smi_flash.c
new file mode 100644
index 0000000000..54edf1446b
--- /dev/null
+++ b/src/soc/amd/common/block/psp/psp_smi_flash.c
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <types.h>
+#include "psp_def.h"
+
+enum mbox_p2c_status psp_smi_spi_get_info(struct mbox_default_buffer *buffer)
+{
+	printk(BIOS_SPEW, "PSP: SPI info request\n");
+
+	return MBOX_PSP_UNSUPPORTED;
+}
+
+enum mbox_p2c_status psp_smi_spi_read(struct mbox_default_buffer *buffer)
+{
+	printk(BIOS_SPEW, "PSP: SPI read request\n");
+
+	return MBOX_PSP_UNSUPPORTED;
+}
+
+enum mbox_p2c_status psp_smi_spi_write(struct mbox_default_buffer *buffer)
+{
+	printk(BIOS_SPEW, "PSP: SPI write request\n");
+
+	return MBOX_PSP_UNSUPPORTED;
+}
+
+enum mbox_p2c_status psp_smi_spi_erase(struct mbox_default_buffer *buffer)
+{
+	printk(BIOS_SPEW, "PSP: SPI erase request\n");
+
+	return MBOX_PSP_UNSUPPORTED;
+}