boards: emsk: add initial support of normal/non-secure application

* Non-secure/normal application: em_starterkit_em7d_normal
* secure application: em_starterkit_em7d

Signed-off-by: Wayne Ren <wei.ren@synopsys.com>

boards/arc/em_starterkit/Kconfig

@@ -20,4 +20,4 @@ choice
 
 endchoice
 
-endif
+endif

boards/arc/em_starterkit/arc_mpu_regions.c

@@ -9,6 +9,10 @@
 #include <arch/arc/v2/mpu/arc_mpu.h>
 #include <linker/linker-defs.h>
 
+/*
+ * for secure firmware, MPU entries are only set up for secure world.
+ * All regions not listed here are shared by secure world and normal world.
+ */
 static struct arc_mpu_region mpu_regions[] = {
 #if DT_ICCM_SIZE > 0
 	/* Region ICCM */
@@ -33,11 +37,19 @@ static struct arc_mpu_region mpu_regions[] = {
 			AUX_MPU_ATTR_KW | AUX_MPU_ATTR_KR | AUX_MPU_ATTR_UR |
 			AUX_MPU_ATTR_KE | AUX_MPU_ATTR_UE | REGION_DYNAMIC),
 #endif
+
+/*
+ * Region peripheral is shared by secure world and normal world by default,
+ * no need a static mpu entry. If some peripherals belong to secure world,
+ * add it here.
+ */
+#ifndef CONFIG_ARC_SECURE_FIRMWARE
 	/* Region Peripheral */
 	MPU_REGION_ENTRY("PERIPHERAL",
 			 0xF0000000,
 			 64 * 1024,
-			 REGION_KERNEL_RAM_ATTR),
+			 REGION_KERNEL_RAM_ATTR)
+#endif
 };
 
 struct arc_mpu_config mpu_config = {

boards/arc/em_starterkit/em_starterkit_em7d_defconfig

@@ -17,3 +17,5 @@ CONFIG_SERIAL=y
 CONFIG_UART_INTERRUPT_DRIVEN=y
 CONFIG_GPIO=y
 CONFIG_ARC_MPU_ENABLE=y
+CONFIG_ARC_HAS_SECURE=y
+CONFIG_TRUSTED_EXECUTION_SECURE=y

boards/arc/em_starterkit/em_starterkit_em7d_normal.dts

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2018, Synopsys, Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+
+#include <mem.h>
+#include <emsk.dtsi>
+#include "em_starterkit_r23.dtsi"
+#include "board.dtsi"
+
+/ {
+	model = "em_starterkit_em7d_normal";
+	compatible = "snps,em_starterkit_em7d_normal", "snps,em_starterkit";
+
+	aliases {
+		uart-0 = &uart0;
+		uart-1 = &uart1;
+		uart-2 = &uart2;
+	};
+
+	chosen {
+		zephyr,sram = &ddr0;
+		zephyr,console = &uart1;
+		zephyr,shell-uart = &uart1;
+	};
+
+	iccm@0 {
+		reg = <0x20000 DT_SIZE_K(128)>;
+	};
+
+	dccm@80000000 {
+		reg = <0x80010000 DT_SIZE_K(64)>;
+	};
+};
+
+&uart1 {
+	status = "okay";
+	current-speed = <115200>;
+};

boards/arc/em_starterkit/em_starterkit_em7d_normal.yaml

@@ -0,0 +1,18 @@
+identifier: em_starterkit_em7d_normal
+name: EM Starterkit EM7D normal world
+type: mcu
+arch: arc
+toolchain:
+  - zephyr
+  - xtools
+supported:
+  - i2c
+  - spi
+  - gpio
+ram: 64
+flash: 128
+testing:
+  default: true
+  ignore_tags:
+    - net
+    - bluetooth

boards/arc/em_starterkit/em_starterkit_em7d_normal_defconfig

@@ -0,0 +1,18 @@
+CONFIG_ARC=y
+CONFIG_SOC_EMSK=y
+CONFIG_SOC_EMSK_EM7D=y
+CONFIG_BOARD_EM_STARTERKIT=y
+CONFIG_BOARD_EM_STARTERKIT_R23=y
+CONFIG_SYS_CLOCK_TICKS_PER_SEC=100
+CONFIG_XIP=n
+CONFIG_BUILD_OUTPUT_BIN=n
+CONFIG_PRINTK=y
+CONFIG_ARCV2_INTERRUPT_UNIT=y
+CONFIG_ARCV2_TIMER=y
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+CONFIG_SERIAL=y
+CONFIG_UART_INTERRUPT_DRIVEN=y
+CONFIG_GPIO=y
+CONFIG_ARC_MPU_ENABLE=y
+CONFIG_TRUSTED_EXECUTION_NONSECURE=y

soc/arc/snps_emsk/Kconfig

@@ -14,7 +14,6 @@ default SOC_EMSK_EM7D
 config SOC_EMSK_EM7D
 	bool "Synopsys ARC EM7D of EMSK"
 	select CPU_HAS_MPU
-	select ARC_HAS_SECURE if BOARD_EM_STARTERKIT_R23
 
 config SOC_EMSK_EM11D
 	bool "Synopsys ARC EM11D of EMSK"

soc/arc/snps_emsk/Kconfig.soc

@@ -7,5 +7,5 @@
 
 config SOC_EMSK
 	bool "Synopsys ARC EM Starter Kit SoC"
-	select HAS_I2C_DW
-	select HAS_SPI_DW
+	select HAS_I2C_DW if I2C
+	select HAS_SPI_DW if SPI