tests: flash_simulator: reboot: added

Add a test for the flash simulator preserving memory across a
`sys_reboot` through the use of memory regions.

Signed-off-by: Jordan Yates <jordan@embeint.com>

tests/drivers/flash_simulator/flash_sim_reboot/CMakeLists.txt

@@ -0,0 +1,12 @@
+#
+# Copyright (c) 2018 Nordic Semiconductor ASA.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(flash_simulator_reboot)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

tests/drivers/flash_simulator/flash_sim_reboot/boards/mps2_an385.overlay

@@ -0,0 +1,27 @@
+#include <mem.h>
+
+/ {
+	sram_203F0000:sram@203F0000 {
+		compatible = "zephyr,memory-region", "mmio-sram";
+		reg = <0x203F0000 0x10000>;
+		zephyr,memory-region = "FlashSim";
+		status = "okay";
+	};
+
+	sim_flash_controller: sim_flash_controller {
+		compatible = "zephyr,sim-flash";
+
+		#address-cells = <1>;
+		#size-cells = <1>;
+		erase-value = <0xff>;
+		memory-region = <&sram_203F0000>;
+
+		flash_sim0: flash_sim@0 {
+			compatible = "soc-nv-flash";
+			reg = <0x00000000 0x10000>;
+
+			erase-block-size = <1024>;
+			write-block-size = <4>;
+		};
+	};
+};

tests/drivers/flash_simulator/flash_sim_reboot/prj.conf

@@ -0,0 +1,4 @@
+CONFIG_ZTEST=y
+CONFIG_FLASH=y
+CONFIG_FLASH_SIMULATOR=y
+CONFIG_REBOOT=y

tests/drivers/flash_simulator/flash_sim_reboot/src/main.c

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2018 Nordic Semiconductor ASA.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/ztest.h>
+#include <zephyr/drivers/flash.h>
+#include <zephyr/device.h>
+#include <zephyr/sys/reboot.h>
+#include <zephyr/toolchain.h>
+
+#define MAGIC_WORD 0xABDE2134
+
+#define SOC_NV_FLASH_NODE          DT_CHILD(DT_INST(0, zephyr_sim_flash), flash_sim_0)
+#define FLASH_SIMULATOR_FLASH_SIZE DT_REG_SIZE(SOC_NV_FLASH_NODE)
+
+static const struct device *const flash_dev = DEVICE_DT_GET(DT_NODELABEL(sim_flash_controller));
+static uint32_t boot_count __noinit;
+
+ZTEST(flash_sim_reboot, test_preserve_over_reboot)
+{
+	uint32_t word = MAGIC_WORD;
+	int rc;
+
+	if (boot_count == 0) {
+		printk("First boot, erasing flash\n");
+		rc = flash_erase(flash_dev, 0, FLASH_SIMULATOR_FLASH_SIZE);
+		zassert_equal(0, rc, "Failed to erase flash");
+		printk("Writing magic word to offset 0\n");
+		rc = flash_write(flash_dev, 0, &word, sizeof(word));
+		zassert_equal(0, rc, "Failed to write flash");
+		printk("Rebooting device...\n");
+		boot_count += 1;
+		sys_reboot(SYS_REBOOT_WARM);
+		zassert_unreachable("Failed to reboot");
+	} else if (boot_count == 1) {
+		printk("Second boot, reading magic word\n");
+		rc = flash_read(flash_dev, 0, &word, sizeof(word));
+		zassert_equal(0, rc, "Failed to read flash");
+		zassert_equal(MAGIC_WORD, word, "Magic word not preserved");
+	} else {
+		zassert_unreachable("Unexpected boot_count value %d", boot_count);
+	}
+}
+
+void *flash_sim_setup(void)
+{
+	zassert_true(device_is_ready(flash_dev), "Simulated flash device not ready");
+
+	return NULL;
+}
+
+ZTEST_SUITE(flash_sim_reboot, NULL, flash_sim_setup, NULL, NULL, NULL);

tests/drivers/flash_simulator/flash_sim_reboot/testcase.yaml

@@ -0,0 +1,10 @@
+common:
+  tags:
+    - drivers
+    - flash
+tests:
+  drivers.flash.flash_simulator.boot_no_erase:
+    timeout: 5
+    platform_allow: mps2/an385
+    integration_platforms:
+      - mps2/an385