test/dm/wdt.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2017 Google, Inc
 */

#include <cyclic.h>
#include <dm.h>
#include <time.h>
#include <wdt.h>
#include <asm/gpio.h>
#include <asm/state.h>
#include <asm/test.h>
#include <dm/test.h>
#include <test/test.h>
#include <test/ut.h>
#include <linux/delay.h>
#include <watchdog.h>

/* Test that watchdog driver functions are called */
static int dm_test_wdt_base(struct unit_test_state *uts)
{
	struct sandbox_state *state = state_get_current();
	struct udevice *dev;
	const u64 timeout = 42;

	ut_assertok(uclass_get_device_by_driver(UCLASS_WDT,
						DM_DRIVER_GET(wdt_sandbox), &dev));
	ut_assertnonnull(dev);
	ut_asserteq(0, state->wdt.counter);
	ut_asserteq(false, state->wdt.running);

	ut_assertok(wdt_start(dev, timeout, 0));
	ut_asserteq(timeout, state->wdt.counter);
	ut_asserteq(true, state->wdt.running);

	uint reset_count = state->wdt.reset_count;
	ut_assertok(wdt_reset(dev));
	ut_asserteq(reset_count + 1, state->wdt.reset_count);
	ut_asserteq(true, state->wdt.running);

	ut_assertok(wdt_stop(dev));
	ut_asserteq(false, state->wdt.running);

	return 0;
}
DM_TEST(dm_test_wdt_base, UTF_SCAN_PDATA | UTF_SCAN_FDT);

static int dm_test_wdt_gpio_toggle(struct unit_test_state *uts)
{
	/*
	 * The sandbox wdt gpio is "connected" to gpio bank a, offset
	 * 7. Use the sandbox back door to verify that the gpio-wdt
	 * driver behaves as expected when using the 'toggle' algorithm.
	 */
	struct udevice *wdt, *gpio;
	const u64 timeout = 42;
	const int offset = 8;
	int val;

	ut_assertok(uclass_get_device_by_name(UCLASS_WDT,
					      "wdt-gpio-toggle", &wdt));
	ut_assertnonnull(wdt);

	ut_assertok(uclass_get_device_by_name(UCLASS_GPIO, "base-gpios", &gpio));
	ut_assertnonnull(gpio);
	ut_assertok(wdt_start(wdt, timeout, 0));

	val = sandbox_gpio_get_value(gpio, offset);
	ut_assertok(wdt_reset(wdt));
	ut_asserteq(!val, sandbox_gpio_get_value(gpio, offset));
	ut_assertok(wdt_reset(wdt));
	ut_asserteq(val, sandbox_gpio_get_value(gpio, offset));

	ut_asserteq(-ENOSYS, wdt_stop(wdt));

	return 0;
}
DM_TEST(dm_test_wdt_gpio_toggle, UTF_SCAN_FDT);

static int dm_test_wdt_gpio_level(struct unit_test_state *uts)
{
	/*
	 * The sandbox wdt gpio is "connected" to gpio bank a, offset
	 * 7. Use the sandbox back door to verify that the gpio-wdt
	 * driver behaves as expected when using the 'level' algorithm.
	 */
	struct udevice *wdt, *gpio;
	const u64 timeout = 42;
	const int offset = 7;
	int val;

	ut_assertok(uclass_get_device_by_name(UCLASS_WDT,
					      "wdt-gpio-level", &wdt));
	ut_assertnonnull(wdt);

	ut_assertok(uclass_get_device_by_name(UCLASS_GPIO, "base-gpios", &gpio));
	ut_assertnonnull(gpio);
	ut_assertok(wdt_start(wdt, timeout, 0));

	val = sandbox_gpio_get_value(gpio, offset);
	ut_assertok(wdt_reset(wdt));
	ut_asserteq(val, sandbox_gpio_get_value(gpio, offset));
	ut_assertok(wdt_reset(wdt));
	ut_asserteq(val, sandbox_gpio_get_value(gpio, offset));

	ut_asserteq(-ENOSYS, wdt_stop(wdt));

	return 0;
}
DM_TEST(dm_test_wdt_gpio_level, UTF_SCAN_FDT);

static int dm_test_wdt_watchdog_reset(struct unit_test_state *uts)
{
	struct sandbox_state *state = state_get_current();
	struct udevice *gpio_wdt, *sandbox_wdt;
	struct udevice *gpio;
	const u64 timeout = 42;
	const int offset = 8;
	uint reset_count;
	int val;

	ut_assertok(uclass_get_device_by_name(UCLASS_WDT,
					      "wdt-gpio-toggle", &gpio_wdt));
	ut_assertnonnull(gpio_wdt);
	ut_assertok(uclass_get_device_by_driver(UCLASS_WDT,
						DM_DRIVER_GET(wdt_sandbox), &sandbox_wdt));
	ut_assertnonnull(sandbox_wdt);
	ut_assertok(uclass_get_device_by_name(UCLASS_GPIO, "base-gpios", &gpio));
	ut_assertnonnull(gpio);

	/* Neither device should be "started", so watchdog_reset() should be a no-op. */
	reset_count = state->wdt.reset_count;
	val = sandbox_gpio_get_value(gpio, offset);
	cyclic_run();
	ut_asserteq(reset_count, state->wdt.reset_count);
	ut_asserteq(val, sandbox_gpio_get_value(gpio, offset));

	/* Start both devices. */
	ut_assertok(wdt_start(gpio_wdt, timeout, 0));
	ut_assertok(wdt_start(sandbox_wdt, timeout, 0));

	/* Make sure both devices have just been pinged. */
	timer_test_add_offset(100);
	cyclic_run();
	reset_count = state->wdt.reset_count;
	val = sandbox_gpio_get_value(gpio, offset);

	/* The gpio watchdog should be pinged, the sandbox one not. */
	timer_test_add_offset(30);
	cyclic_run();
	ut_asserteq(reset_count, state->wdt.reset_count);
	ut_asserteq(!val, sandbox_gpio_get_value(gpio, offset));

	/* After another ~30ms, both devices should get pinged. */
	timer_test_add_offset(30);
	cyclic_run();
	ut_asserteq(reset_count + 1, state->wdt.reset_count);
	ut_asserteq(val, sandbox_gpio_get_value(gpio, offset));

	return 0;
}
DM_TEST(dm_test_wdt_watchdog_reset, UTF_SCAN_FDT);