Add MCU MBOX Tests and Fix MBOX Lock Clearing Detection (#181)

* -Fix mailbox release detection to be based on valid SW write and data being 0 (instead of value edge detect).
-Update MBOX clearing to explicitly call out writing 0 to EXECUTE register.

* -Add MCU MBOX smoke test with MCU and Caliptra both acquiring and reading/writing MBOX.
-Add MCU MBOX lock return one during zeroize test.
-Update MCU MBOX zeroize smoke test for new infra.
-Add MCU MBOX tests to L0.

* -Add MBOX CSRs are zero after lock release test.
-Fix mbox_status CSR to reset on MBOX lock release.

Author: kedjenks

src/integration/test_suites/smoke_test_mcu_mbox/smoke_test_mcu_mbox.c

@@ -157,27 +157,29 @@ void main (void) {
     char *argv[1];
     enum boot_fsm_state_e boot_fsm_ps;
     const uint32_t mbox_dlen = 16*4;
-    uint32_t mbox_num = 0;
     uint32_t mbox_resp_dlen;
     uint32_t mbox_resp_data;
     uint32_t mci_boot_fsm_go;
     uint32_t sram_data;
 
 
-    VPRINTF(LOW, "=================\nMCU Configure MCI mailboxes\n=================\n\n");
+    VPRINTF(LOW, "=================\nMCU Configure MCI mailboxes\n=================\n\n")
+    // MBOX: Setup valid AXI
+    lsu_write_32(SOC_MCI_TOP_MCI_REG_MBOX0_VALID_AXI_USER_0, 0x32);
+    lsu_write_32(SOC_MCI_TOP_MCI_REG_MBOX0_VALID_AXI_USER_1, 0x33);
+
+    lsu_write_32(SOC_MCI_TOP_MCI_REG_MBOX0_AXI_USER_LOCK_0, MCI_REG_MBOX0_AXI_USER_LOCK_0_LOCK_MASK);
+    lsu_write_32(SOC_MCI_TOP_MCI_REG_MBOX0_AXI_USER_LOCK_1, MCI_REG_MBOX0_AXI_USER_LOCK_1_LOCK_MASK);
 
     VPRINTF(LOW, "MCU: Configured MBOX Valid AXI USER\n");
 
     mcu_mci_boot_go();
 
-    VPRINTF(LOW, "MCU: Caliptra bringup\n");
-
+    VPRINTF(LOW, "MCU: Caliptra bringup\n")
 
-    // Setting Caliptra to DEFAULT user
-    mcu_cptra_fuse_init_axi_user(0xFFFFFFFF);
+    mcu_cptra_fuse_init();
 
-
-    mcu_mbox_clear_lock_out_of_reset(mbox_num);
+    mcu_mbox_clear_lock_out_of_reset();
 
     ////////////////////////////////////
     // Mailbox command test
@@ -192,6 +194,9 @@ void main (void) {
     // Set execute
     mcu_mbox0_send_data_no_wait_status();
 
+    // Wait for status complete    
+    mcu_mbox0_wait_status_complete();
+
     mcu_mbox0_clear_execute();
 
     VPRINTF(LOW, "MCU: Sequence complete\n");