Re: [PATCH 04/25] tests: Add a simple test of the CMSDK APB watchdog

[Luc Michel <luc@lmichel.fr>]

On 19:06 Thu 21 Jan     , Peter Maydell wrote:
> Add a simple test of the CMSDK watchdog, since we're about to do some
> refactoring of how it is clocked.
> 
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Reviewed-by: Luc Michel <luc@lmichel.fr>

> ---
>  tests/qtest/cmsdk-apb-watchdog-test.c | 80 +++++++++++++++++++++++++++
>  MAINTAINERS                           |  1 +
>  tests/qtest/meson.build               |  1 +
>  3 files changed, 82 insertions(+)
>  create mode 100644 tests/qtest/cmsdk-apb-watchdog-test.c
> 
> diff --git a/tests/qtest/cmsdk-apb-watchdog-test.c b/tests/qtest/cmsdk-apb-watchdog-test.c
> new file mode 100644
> index 00000000000..c6add1fee85
> --- /dev/null
> +++ b/tests/qtest/cmsdk-apb-watchdog-test.c
> @@ -0,0 +1,80 @@
> +/*
> + * QTest testcase for the CMSDK APB watchdog device
> + *
> + * Copyright (c) 2021 Linaro Limited
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
> + * for more details.
> + */
> +
> +#include "qemu/osdep.h"
> +#include "libqtest-single.h"
> +
> +/*
> + * lm3s811evb watchdog; at board startup this runs at 200MHz / 16 == 12.5MHz,
> + * which is 80ns per tick.
> + */
> +#define WDOG_BASE 0x40000000
> +
> +#define WDOGLOAD 0
> +#define WDOGVALUE 4
> +#define WDOGCONTROL 8
> +#define WDOGINTCLR 0xc
> +#define WDOGRIS 0x10
> +#define WDOGMIS 0x14
> +#define WDOGLOCK 0xc00
> +
> +static void test_watchdog(void)
> +{
> +    g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 0);
> +
> +    writel(WDOG_BASE + WDOGCONTROL, 1);
> +    writel(WDOG_BASE + WDOGLOAD, 1000);
> +
> +    /* Step to just past the 500th tick */
> +    clock_step(500 * 80 + 1);
> +    g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 0);
> +    g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 500);
> +
> +    /* Just past the 1000th tick: timer should have fired */
> +    clock_step(500 * 80);
> +    g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 1);
> +    g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 0);
> +
> +    /* VALUE reloads at following tick */
> +    clock_step(80);
> +    g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 1000);
> +
> +    /* Writing any value to WDOGINTCLR clears the interrupt and reloads */
> +    clock_step(500 * 80);
> +    g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 500);
> +    g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 1);
> +    writel(WDOG_BASE + WDOGINTCLR, 0);
> +    g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 1000);
> +    g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 0);
> +}
> +
> +int main(int argc, char **argv)
> +{
> +    QTestState *s;
> +    int r;
> +
> +    g_test_init(&argc, &argv, NULL);
> +
> +    s = qtest_start("-machine lm3s811evb");
> +
> +    qtest_add_func("/cmsdk-apb-watchdog/watchdog", test_watchdog);
> +
> +    r = g_test_run();
> +
> +    qtest_end();
> +
> +    return r;
> +}
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 010405b0884..58956497888 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -588,6 +588,7 @@ F: hw/char/cmsdk-apb-uart.c
>  F: include/hw/char/cmsdk-apb-uart.h
>  F: hw/watchdog/cmsdk-apb-watchdog.c
>  F: include/hw/watchdog/cmsdk-apb-watchdog.h
> +F: tests/qtest/cmsdk-apb-watchdog-test.c
>  F: hw/misc/tz-ppc.c
>  F: include/hw/misc/tz-ppc.h
>  F: hw/misc/tz-mpc.c
> diff --git a/tests/qtest/meson.build b/tests/qtest/meson.build
> index 74addd74868..9e2ebc47041 100644
> --- a/tests/qtest/meson.build
> +++ b/tests/qtest/meson.build
> @@ -142,6 +142,7 @@ qtests_npcm7xx = \
>     'npcm7xx_watchdog_timer-test']
>  qtests_arm = \
>    (config_all_devices.has_key('CONFIG_CMSDK_APB_TIMER') ? ['cmsdk-apb-timer-test'] : []) + \
> +  (config_all_devices.has_key('CONFIG_CMSDK_APB_WATCHDOG') ? ['cmsdk-apb-watchdog-test'] : []) + \
>    (config_all_devices.has_key('CONFIG_PFLASH_CFI02') ? ['pflash-cfi02-test'] : []) +         \
>    (config_all_devices.has_key('CONFIG_NPCM7XX') ? qtests_npcm7xx : []) + \
>    ['arm-cpu-features',
> -- 
> 2.20.1
> 

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