RSE: Initialise UART ATU when logging disabled

Ensure that BL1 always initialises the ATU region for the UART, even
when logging in BL1 is disabled. This is required as later components
might enabled logging and therefore use the UART via the ATU.

This patch therefore adds the ATU region initialisation in BL1_2 using
the same ifdefs as initialising the ATU window to device memory.

Change-Id: I324d24234866cd080c291a22aaf4309ef71e9f82
Signed-off-by: Jackson Cooper-Driver <jackson.cooper-driver@arm.com>

Author: jaccoo01

platform/ext/target/arm/rse/common/bl1/boot_hal_bl1_2.c

@@ -129,6 +129,24 @@ static int32_t init_mpu_region_for_atu(void)
 
     return mpu_armv8m_enable(&dev_mpu_s, PRIVILEGED_DEFAULT_ENABLE, HARDFAULT_NMI_ENABLE);
 }
+
+#if defined(RSE_USE_HOST_UART)
+static enum tfm_plat_err_t init_atu_region_for_uart(void)
+{
+    enum atu_error_t atu_err;
+
+    /* Initialize UART region */
+    atu_err = atu_initialize_region(&ATU_DEV_S,
+                                    get_supported_region_count(&ATU_DEV_S) - 1,
+                                    HOST_UART0_BASE_NS, HOST_UART_BASE,
+                                    HOST_UART_SIZE);
+    if (atu_err != ATU_ERR_NONE) {
+        return (enum tfm_plat_err_t)atu_err;
+    }
+
+    return TFM_PLAT_ERR_SUCCESS;
+}
+#endif /* defined(RSE_USE_HOST_UART) */
 #endif /* !(defined(LOGGING_ENABLED) && defined(RSE_USE_HOST_UART)) */
 
 #ifdef RSE_SUPPORT_ROM_LIB_RELOCATION
@@ -257,6 +275,18 @@ int32_t boot_platform_init(void)
     if (result != 0) {
         return result;
     }
+
+#if defined(RSE_USE_HOST_UART)
+    /**
+     * Add the ATU region for the UART even though logging is disabled
+     * in BL1_2 as later components might enable logging and try and use
+     * it
+     */
+    plat_err = init_atu_region_for_uart();
+    if (plat_err != TFM_PLAT_ERR_SUCCESS) {
+        return plat_err;
+    }
+#endif /* defined(RSE_USE_HOST_UART) */
 #endif /* !(defined(LOGGING_ENABLED) && defined(RSE_USE_HOST_UART)) */
 
 #ifdef LOGGING_ENABLED