diff --git a/drivers/firmware/stratix10-svc.c b/drivers/firmware/stratix10-svc.c
index 2d674126160f..430e8bf0bca9 100644
--- a/drivers/firmware/stratix10-svc.c
+++ b/drivers/firmware/stratix10-svc.c
@@ -37,6 +37,7 @@
 #define SVC_NUM_CHANNEL				3
 #define FPGA_CONFIG_DATA_CLAIM_TIMEOUT_MS	200
 #define FPGA_CONFIG_STATUS_TIMEOUT_SEC		30
+#define BYTE_TO_WORD_SIZE              4
 
 /* stratix10 service layer clients */
 #define STRATIX10_RSU				"stratix10-rsu"
@@ -361,6 +362,13 @@ static void svc_thread_recv_status_ok(struct stratix10_svc_data *p_data,
 		cb_data->kaddr2 = svc_pa_to_va(res.a2);
 		cb_data->kaddr3 = &res.a3;
 		break;
+	case COMMAND_MBOX_SEND_CMD:
+		cb_data->status = BIT(SVC_STATUS_OK);
+		cb_data->kaddr1 = &res.a1;
+		/* SDM return size in u32 word. Convert size to u8 */
+		res.a2 = res.a2 * BYTE_TO_WORD_SIZE;
+		cb_data->kaddr2 = &res.a2;
+		break;
 	default:
 		pr_warn("it shouldn't happen\n");
 		break;
@@ -534,6 +542,15 @@ static int svc_normal_to_secure_thread(void *data)
 			a1 = 0;
 			a2 = 0;
 			break;
+		case COMMAND_MBOX_SEND_CMD:
+			a0 = INTEL_SIP_SMC_MBOX_SEND_CMD;
+			a1 = pdata->arg[0];
+			a2 = (unsigned long)pdata->paddr;
+			a3 = (unsigned long)pdata->size / BYTE_TO_WORD_SIZE;
+			a4 = pdata->arg[1];
+			a5 = (unsigned long)pdata->paddr_output;
+			a6 = (unsigned long)pdata->size_output / BYTE_TO_WORD_SIZE;
+			break;
 		default:
 			pr_warn("it shouldn't happen\n");
 			break;
@@ -597,6 +614,7 @@ static int svc_normal_to_secure_thread(void *data)
 			case COMMAND_FCS_DATA_ENCRYPTION:
 			case COMMAND_FCS_DATA_DECRYPTION:
 			case COMMAND_FCS_RANDOM_NUMBER_GEN:
+			case COMMAND_MBOX_SEND_CMD:
 				cbdata->status = BIT(SVC_STATUS_INVALID_PARAM);
 				cbdata->kaddr1 = NULL;
 				cbdata->kaddr2 = NULL;
diff --git a/include/linux/firmware/intel/stratix10-smc.h b/include/linux/firmware/intel/stratix10-smc.h
index a718f853d457..ee80ca4bb0d0 100644
--- a/include/linux/firmware/intel/stratix10-smc.h
+++ b/include/linux/firmware/intel/stratix10-smc.h
@@ -466,6 +466,31 @@ INTEL_SIP_SMC_FAST_CALL_VAL(INTEL_SIP_SMC_FUNCID_FPGA_CONFIG_COMPLETED_WRITE)
 #define INTEL_SIP_SMC_FIRMWARE_VERSION \
         INTEL_SIP_SMC_FAST_CALL_VAL(INTEL_SIP_SMC_FUNCID_FIRMWARE_VERSION)
 
+/**
+ * SMC call protocol for Mailbox, starting FUNCID from 60
+ *
+ * Call register usage:
+ * a0 INTEL_SIP_SMC_MBOX_SEND_CMD
+ * a1 mailbox command code
+ * a2 physical address that contain mailbox command data (not include header)
+ * a3 mailbox command data size in word
+ * a4 set to 0 for CASUAL, set to 1 for URGENT
+ * a5 physical address for secure firmware to put response data
+ *    (not include header)
+ * a6 maximum size in word of physical address to store response data
+ * a7 not used
+ *
+ * Return status
+ * a0 INTEL_SIP_SMC_STATUS_OK, INTEL_SIP_SMC_STATUS_REJECTED or
+ *    INTEL_SIP_SMC_STATUS_ERROR
+ * a1 mailbox error code
+ * a2 response data length in word
+ * a3 not used
+ */
+#define INTEL_SIP_SMC_FUNCID_MBOX_SEND_CMD 60
+	#define INTEL_SIP_SMC_MBOX_SEND_CMD \
+	INTEL_SIP_SMC_FAST_CALL_VAL(INTEL_SIP_SMC_FUNCID_MBOX_SEND_CMD)
+
 /**
  * Request INTEL_SIP_SMC_SVC_VERSION
  *
diff --git a/include/linux/firmware/intel/stratix10-svc-client.h b/include/linux/firmware/intel/stratix10-svc-client.h
index 0c16037fd08d..60ed82112680 100644
--- a/include/linux/firmware/intel/stratix10-svc-client.h
+++ b/include/linux/firmware/intel/stratix10-svc-client.h
@@ -118,6 +118,9 @@ struct stratix10_svc_chan;
  * @COMMAND_SMC_SVC_VERSION: Non-mailbox SMC SVC API Version,
  * return status is SVC_STATUS_OK
  *
+ * @COMMAND_MBOX_SEND_CMD: send generic mailbox command, return status is
+ * SVC_STATUS_OK or SVC_STATUS_ERROR
+ *
  * @COMMAND_RSU_DCMF_STATUS: query firmware for the DCMF status
  * return status is SVC_STATUS_OK or SVC_STATUS_ERROR
  *
@@ -164,6 +167,8 @@ enum stratix10_svc_command_code {
 	COMMAND_FCS_RANDOM_NUMBER_GEN,
 	/* for general status poll */
 	COMMAND_POLL_SERVICE_STATUS = 40,
+	/* for generic mailbox send command */
+	COMMAND_MBOX_SEND_CMD = 100,
 	/* Non-mailbox SMC Call */
 	COMMAND_SMC_SVC_VERSION = 200,
 };
