zephyr: test: drivers: add eSPI test using host command

Verify that we can call host commands from driver tests by adding a test
that calls the EC_CMD_GET_PROTOCOL_INFO host command. Add a few
convenience functions to host_command.h when building with CONFIG_ZTEST
enabled. Also, add eSPI emulator to support the test.

Coverage:
- lines     17.4% -> 17.8%
- functions 21.4% -> 22.0%

BRANCH=none
BUG=b:189954415
TEST=zmake configure --test zephyr/test/drivers

Signed-off-by: Yuval Peress <peress@chromium.org>
Change-Id: Ib9e750eeab555ea629a560cbf3beed28e346c460
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3031842
Reviewed-by: Jeremy Bettis <jbettis@chromium.org>

4 files changed, 60 insertions, 1 deletions

diff --git a/zephyr/test/drivers/overlay.dts b/zephyr/test/drivers/overlay.dts
index f0413746d3..4d650551fa 100644
--- a/zephyr/test/drivers/overlay.dts
+++ b/zephyr/test/drivers/overlay.dts
@@ -39,6 +39,11 @@
 			enum-name = "GPIO_PG_EC_DSW_PWROK";
 			label = "PG_EC_DSW_PWROK";
 		};
+		ec_pch_wake_odl {
+			gpios = <&gpio0 5 GPIO_OUT_HIGH>;
+			enum-name = "GPIO_EC_PCH_WAKE_ODL";
+			label = "EC_PCH_WAKE_ODL";
+		};
 	};
 	named-i2c-ports {
 		compatible = "named-i2c-ports";
@@ -392,8 +397,17 @@
 	};
 };
 
+&espi0 {
+	espi-host@0 {
+		status = "okay";
+		compatible = "zephyr,espi-emul-espi-host";
+		reg = <0x0>;
+		label = "ESPI_HOST";
+	};
+};
+
 &gpio0 {
-	ngpios = <5>;
+	ngpios = <6>;
 };
 
 &i2c0 {
diff --git a/zephyr/test/drivers/prj.conf b/zephyr/test/drivers/prj.conf
index 3fd3636946..4ba0efc2a0 100644
--- a/zephyr/test/drivers/prj.conf
+++ b/zephyr/test/drivers/prj.conf
@@ -61,6 +61,14 @@ CONFIG_PLATFORM_EC_ACCEL_FIFO=y
 CONFIG_PLATFORM_EC_SENSOR_TIGHT_TIMESTAMPS=y
 CONFIG_PLATFORM_EC_ALS_TCS3400=y
 
+CONFIG_ESPI=y
+CONFIG_ESPI_EMUL=y
+CONFIG_EMUL_ESPI_HOST=y
+CONFIG_PLATFORM_EC_ESPI=y
+CONFIG_ESPI_PERIPHERAL_ACPI_SHM_REGION=y
+CONFIG_ESPI_PERIPHERAL_CUSTOM_OPCODE=y
+CONFIG_ESPI_PERIPHERAL_EC_HOST_CMD=y
+
 # Things that default to on, but aren't working yet
 CONFIG_PLATFORM_EC_BACKLIGHT_LID=n
 CONFIG_PLATFORM_EC_SWITCH=n
diff --git a/zephyr/test/drivers/src/espi.c b/zephyr/test/drivers/src/espi.c
new file mode 100644
index 0000000000..c852f1b771
--- /dev/null
+++ b/zephyr/test/drivers/src/espi.c
@@ -0,0 +1,35 @@
+/* Copyright 2021 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include <zephyr.h>
+#include <ztest.h>
+
+#include "ec_commands.h"
+#include "host_command.h"
+
+static void test_host_command_get_protocol_info(void)
+{
+	struct ec_response_get_protocol_info response;
+	struct host_cmd_handler_args args =
+		BUILD_HOST_COMMAND(EC_CMD_GET_PROTOCOL_INFO, 0, response);
+
+	zassert_ok(host_command_process(&args), NULL);
+	zassert_ok(args.result, NULL);
+	zassert_equal(args.response_size, sizeof(response), NULL);
+	zassert_equal(response.protocol_versions, BIT(3), NULL);
+	zassert_equal(response.max_request_packet_size, EC_LPC_HOST_PACKET_SIZE,
+		      NULL);
+	zassert_equal(response.max_response_packet_size,
+		      EC_LPC_HOST_PACKET_SIZE, NULL);
+	zassert_equal(response.flags, 0, NULL);
+}
+
+void test_suite_espi(void)
+{
+	ztest_test_suite(espi,
+			 ztest_user_unit_test(
+				 test_host_command_get_protocol_info));
+	ztest_run_test_suite(espi);
+}
diff --git a/zephyr/test/drivers/src/main.c b/zephyr/test/drivers/src/main.c
index ca573b98fd..46fd462283 100644
--- a/zephyr/test/drivers/src/main.c
+++ b/zephyr/test/drivers/src/main.c
@@ -18,6 +18,7 @@ extern void test_suite_ppc(void);
 extern void test_suite_bmi260(void);
 extern void test_suite_bmi160(void);
 extern void test_suite_tcs3400(void);
+extern void test_suite_espi(void);
 
 void test_main(void)
 {
@@ -37,4 +38,5 @@ void test_main(void)
 	test_suite_bmi260();
 	test_suite_bmi160();
 	test_suite_tcs3400();
+	test_suite_espi();
 }