sandbox: Add serial test

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/serial/sandbox.c

@@ -143,6 +143,19 @@ static int sandbox_serial_getc(struct udevice *dev)
 	return result;
 }
 
+static int sandbox_serial_setconfig(struct udevice *dev, uint serial_config)
+{
+	u8 parity = SERIAL_GET_PARITY(serial_config);
+	u8 bits = SERIAL_GET_BITS(serial_config);
+	u8 stop = SERIAL_GET_STOP(serial_config);
+
+	if (bits != SERIAL_8_BITS || stop != SERIAL_ONE_STOP ||
+	    parity != SERIAL_PAR_NONE)
+		return -ENOTSUPP; /* not supported in driver*/
+
+	return 0;
+}
+
 static const char * const ansi_colour[] = {
 	"black", "red", "green", "yellow", "blue", "megenta", "cyan",
 	"white",
@@ -173,6 +186,7 @@ static const struct dm_serial_ops sandbox_serial_ops = {
 	.putc = sandbox_serial_putc,
 	.pending = sandbox_serial_pending,
 	.getc = sandbox_serial_getc,
+	.setconfig = sandbox_serial_setconfig,
 };
 
 static const struct udevice_id sandbox_serial_ids[] = {

include/common.h

@@ -359,6 +359,7 @@ void	serial_putc_raw(const char);
 void	serial_puts   (const char *);
 int	serial_getc   (void);
 int	serial_tstc   (void);
+int	serial_setconfig(uint config);
 
 /* $(CPU)/speed.c */
 int	get_clocks (void);

include/serial.h

@@ -102,6 +102,11 @@ enum serial_stop {
 #define SERIAL_GET_STOP(config) \
 	((config & SERIAL_STOP_MASK) >> SERIAL_STOP_SHIFT)
 
+#define SERIAL_CONFIG(par, bits, stop) \
+		     (par << SERIAL_PAR_SHIFT | \
+		      bits << SERIAL_BITS_SHIFT | \
+		      stop << SERIAL_STOP_SHIFT)
+
 #define SERIAL_DEFAULT_CONFIG	SERIAL_PAR_NONE << SERIAL_PAR_SHIFT | \
 				SERIAL_8_BITS << SERIAL_BITS_SHIFT | \
 				SERIAL_ONE_STOP << SERIAL_STOP_SHIFT

test/dm/Makefile

@@ -46,4 +46,5 @@ obj-$(CONFIG_SPMI) += spmi.o
 obj-$(CONFIG_WDT) += wdt.o
 obj-$(CONFIG_AXI) += axi.o
 obj-$(CONFIG_MISC) += misc.o
+obj-$(CONFIG_DM_SERIAL) += serial.o
 endif

test/dm/serial.c

@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018, STMicroelectronics
+ */
+
+#include <common.h>
+#include <serial.h>
+#include <dm.h>
+#include <dm/test.h>
+#include <test/ut.h>
+
+static int dm_test_serial(struct unit_test_state *uts)
+{
+	struct udevice *dev_serial;
+
+	ut_assertok(uclass_get_device_by_name(UCLASS_SERIAL, "serial",
+					      &dev_serial));
+
+	ut_assertok(serial_tstc());
+	/*
+	 * test with default config which is the only one supported by
+	 * sandbox_serial driver
+	 */
+	ut_assertok(serial_setconfig(SERIAL_DEFAULT_CONFIG));
+	/*
+	 * test with a serial config which is not supported by
+	 * sandbox_serial driver: test with wrong parity
+	 */
+	ut_asserteq(-ENOTSUPP,
+		    serial_setconfig(SERIAL_CONFIG(SERIAL_PAR_ODD,
+						   SERIAL_8_BITS,
+						   SERIAL_ONE_STOP)));
+	/*
+	 * test with a serial config which is not supported by
+	 * sandbox_serial driver: test with wrong bits number
+	 */
+	ut_asserteq(-ENOTSUPP,
+		    serial_setconfig(SERIAL_CONFIG(SERIAL_PAR_NONE,
+						   SERIAL_6_BITS,
+						   SERIAL_ONE_STOP)));
+
+	/*
+	 * test with a serial config which is not supported by
+	 * sandbox_serial driver: test with wrong stop bits number
+	 */
+	ut_asserteq(-ENOTSUPP,
+		    serial_setconfig(SERIAL_CONFIG(SERIAL_PAR_NONE,
+						   SERIAL_8_BITS,
+						   SERIAL_TWO_STOP)));
+
+	return 0;
+}
+
+DM_TEST(dm_test_serial, DM_TESTF_SCAN_FDT);