dm: spi: Add tests

These tests use SPI flash (and the sandbox emulation) to operate.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>

test/dm/Makefile

@@ -18,4 +18,5 @@ obj-$(CONFIG_DM_TEST) += core.o
 obj-$(CONFIG_DM_TEST) += ut.o
 ifneq ($(CONFIG_SANDBOX),)
 obj-$(CONFIG_DM_GPIO) += gpio.o
+obj-$(CONFIG_DM_SPI) += spi.o
 endif

test/dm/spi.c

@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2013 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <spi.h>
+#include <spi_flash.h>
+#include <dm/device-internal.h>
+#include <dm/test.h>
+#include <dm/uclass-internal.h>
+#include <dm/ut.h>
+#include <dm/util.h>
+#include <asm/state.h>
+
+/* Test that we can find buses and chip-selects */
+static int dm_test_spi_find(struct dm_test_state *dms)
+{
+	struct sandbox_state *state = state_get_current();
+	struct spi_slave *slave;
+	struct udevice *bus, *dev;
+	const int busnum = 0, cs = 0, mode = 0, speed = 1000000, cs_b = 1;
+	struct spi_cs_info info;
+	int of_offset;
+
+	ut_asserteq(-ENODEV, uclass_find_device_by_seq(UCLASS_SPI, busnum,
+						       false, &bus));
+
+	/*
+	 * spi_post_bind() will bind devices to chip selects. Check this then
+	 * remove the emulation and the slave device.
+	 */
+	ut_asserteq(0, uclass_get_device_by_seq(UCLASS_SPI, busnum, &bus));
+	ut_assertok(spi_cs_info(bus, cs, &info));
+	of_offset = info.dev->of_offset;
+	sandbox_sf_unbind_emul(state_get_current(), busnum, cs);
+	device_remove(info.dev);
+	device_unbind(info.dev);
+
+	/*
+	 * Even though the device is gone, the sandbox SPI drivers always
+	 * reports that CS 0 is present
+	 */
+	ut_assertok(spi_cs_info(bus, cs, &info));
+	ut_asserteq_ptr(info.dev, NULL);
+
+	/* This finds nothing because we removed the device */
+	ut_asserteq(-ENODEV, spi_find_bus_and_cs(busnum, cs, &bus, &dev));
+	ut_asserteq(-ENODEV, spi_get_bus_and_cs(busnum, cs, speed, mode,
+						NULL, 0, &bus, &slave));
+
+	/*
+	 * This forces the device to be re-added, but there is no emulation
+	 * connected so the probe will fail. We require that bus is left
+	 * alone on failure, and that the spi_get_bus_and_cs() does not add
+	 * a 'partially-inited' device.
+	 */
+	ut_asserteq(-ENODEV, spi_find_bus_and_cs(busnum, cs, &bus, &dev));
+	ut_asserteq(-ENOENT, spi_get_bus_and_cs(busnum, cs, speed, mode,
+						"spi_flash_std", "name", &bus,
+						&slave));
+	ut_assertok(spi_cs_info(bus, cs, &info));
+	ut_asserteq_ptr(info.dev, NULL);
+
+	/* Add the emulation and try again */
+	ut_assertok(sandbox_sf_bind_emul(state, busnum, cs, bus, of_offset,
+					 "name"));
+	ut_assertok(spi_find_bus_and_cs(busnum, cs, &bus, &dev));
+	ut_assertok(spi_get_bus_and_cs(busnum, cs, speed, mode,
+				       "spi_flash_std", "name", &bus, &slave));
+
+	ut_assertok(spi_cs_info(bus, cs, &info));
+	ut_asserteq_ptr(info.dev, slave->dev);
+
+	/* We should be able to add something to another chip select */
+	ut_assertok(sandbox_sf_bind_emul(state, busnum, cs_b, bus, of_offset,
+					 "name"));
+	ut_assertok(spi_get_bus_and_cs(busnum, cs_b, speed, mode,
+				       "spi_flash_std", "name", &bus, &slave));
+	ut_assertok(spi_cs_info(bus, cs_b, &info));
+	ut_asserteq_ptr(info.dev, slave->dev);
+
+	/*
+	 * Since we are about to destroy all devices, we must tell sandbox
+	 * to forget the emulation device
+	 */
+	sandbox_sf_unbind_emul(state_get_current(), busnum, cs);
+	sandbox_sf_unbind_emul(state_get_current(), busnum, cs_b);
+
+	return 0;
+}
+DM_TEST(dm_test_spi_find, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+
+/* Test that sandbox SPI works correctly */
+static int dm_test_spi_xfer(struct dm_test_state *dms)
+{
+	struct spi_slave *slave;
+	struct udevice *bus;
+	const int busnum = 0, cs = 0, mode = 0;
+	const char dout[5] = {0x9f};
+	unsigned char din[5];
+
+	ut_assertok(spi_get_bus_and_cs(busnum, cs, 1000000, mode, NULL, 0,
+				       &bus, &slave));
+	ut_assertok(spi_claim_bus(slave));
+	ut_assertok(spi_xfer(slave, 40, dout, din,
+			     SPI_XFER_BEGIN | SPI_XFER_END));
+	ut_asserteq(0xff, din[0]);
+	ut_asserteq(0x20, din[1]);
+	ut_asserteq(0x20, din[2]);
+	ut_asserteq(0x15, din[3]);
+	spi_release_bus(slave);
+
+	/*
+	 * Since we are about to destroy all devices, we must tell sandbox
+	 * to forget the emulation device
+	 */
+#ifdef CONFIG_DM_SPI_FLASH
+	sandbox_sf_unbind_emul(state_get_current(), busnum, cs);
+#endif
+
+	return 0;
+}
+DM_TEST(dm_test_spi_xfer, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);

test/dm/test-dm.sh

@@ -4,4 +4,6 @@ NUM_CPUS=$(cat /proc/cpuinfo |grep -c processor)
 dtc -I dts -O dtb test/dm/test.dts -o test/dm/test.dtb
 make O=sandbox sandbox_config
 make O=sandbox -s -j${NUM_CPUS}
+dd if=/dev/zero of=spi.bin bs=1M count=2
 ./sandbox/u-boot -d test/dm/test.dtb -c "dm test"
+rm spi.bin