Re: [PATCH v2 05/25] tests: Add a simple test of the CMSDK APB dual timer

[Luc Michel]

On 11:41 Thu 28 Jan     , Peter Maydell wrote:
> Add a simple test of the CMSDK dual timer, since we're about to do
> some refactoring of how it is clocked.
> 
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> Message-id: 20210121190622.22000-6-peter.maydell@linaro.org

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

> ---
> v1->v2 changes:
>  - phrase various clock_step() arguments as calculations
>    based on tick counts and the ns-per-tick value rather
>    than just the final numbers
>  - remove set-but-not-used QTestState *s variable
>    that gcc warns about but clang does not
>  - use 40 * 256 in test_prescale() as suggested by Luc
> ---
>  tests/qtest/cmsdk-apb-dualtimer-test.c | 130 +++++++++++++++++++++++++
>  MAINTAINERS                            |   1 +
>  tests/qtest/meson.build                |   1 +
>  3 files changed, 132 insertions(+)
>  create mode 100644 tests/qtest/cmsdk-apb-dualtimer-test.c
> 
> diff --git a/tests/qtest/cmsdk-apb-dualtimer-test.c 
> b/tests/qtest/cmsdk-apb-dualtimer-test.c
> new file mode 100644
> index 00000000000..ad6a758289c
> --- /dev/null
> +++ b/tests/qtest/cmsdk-apb-dualtimer-test.c
> @@ -0,0 +1,130 @@
> +/*
> + * QTest testcase for the CMSDK APB dualtimer 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"
> +
> +/* IoTKit/ARMSSE dualtimer; driven at 25MHz in mps2-an385, so 40ns per tick 
> */
> +#define TIMER_BASE 0x40002000
> +
> +#define TIMER1LOAD 0
> +#define TIMER1VALUE 4
> +#define TIMER1CONTROL 8
> +#define TIMER1INTCLR 0xc
> +#define TIMER1RIS 0x10
> +#define TIMER1MIS 0x14
> +#define TIMER1BGLOAD 0x18
> +
> +#define TIMER2LOAD 0x20
> +#define TIMER2VALUE 0x24
> +#define TIMER2CONTROL 0x28
> +#define TIMER2INTCLR 0x2c
> +#define TIMER2RIS 0x30
> +#define TIMER2MIS 0x34
> +#define TIMER2BGLOAD 0x38
> +
> +#define CTRL_ENABLE (1 << 7)
> +#define CTRL_PERIODIC (1 << 6)
> +#define CTRL_INTEN (1 << 5)
> +#define CTRL_PRESCALE_1 (0 << 2)
> +#define CTRL_PRESCALE_16 (1 << 2)
> +#define CTRL_PRESCALE_256 (2 << 2)
> +#define CTRL_32BIT (1 << 1)
> +#define CTRL_ONESHOT (1 << 0)
> +
> +static void test_dualtimer(void)
> +{
> +    g_assert_true(readl(TIMER_BASE + TIMER1RIS) == 0);
> +
> +    /* Start timer: will fire after 40000 ns */
> +    writel(TIMER_BASE + TIMER1LOAD, 1000);
> +    /* enable in free-running, wrapping, interrupt mode */
> +    writel(TIMER_BASE + TIMER1CONTROL, CTRL_ENABLE | CTRL_INTEN);
> +
> +    /* Step to just past the 500th tick and check VALUE */
> +    clock_step(500 * 40 + 1);
> +    g_assert_cmpuint(readl(TIMER_BASE + TIMER1RIS), ==, 0);
> +    g_assert_cmpuint(readl(TIMER_BASE + TIMER1VALUE), ==, 500);
> +
> +    /* Just past the 1000th tick: timer should have fired */
> +    clock_step(500 * 40);
> +    g_assert_cmpuint(readl(TIMER_BASE + TIMER1RIS), ==, 1);
> +    g_assert_cmpuint(readl(TIMER_BASE + TIMER1VALUE), ==, 0);
> +
> +    /*
> +     * We are in free-running wrapping 16-bit mode, so on the following
> +     * tick VALUE should have wrapped round to 0xffff.
> +     */
> +    clock_step(40);
> +    g_assert_cmpuint(readl(TIMER_BASE + TIMER1VALUE), ==, 0xffff);
> +
> +    /* Check that any write to INTCLR clears interrupt */
> +    writel(TIMER_BASE + TIMER1INTCLR, 1);
> +    g_assert_cmpuint(readl(TIMER_BASE + TIMER1RIS), ==, 0);
> +
> +    /* Turn off the timer */
> +    writel(TIMER_BASE + TIMER1CONTROL, 0);
> +}
> +
> +static void test_prescale(void)
> +{
> +    g_assert_true(readl(TIMER_BASE + TIMER2RIS) == 0);
> +
> +    /* Start timer: will fire after 40 * 256 * 1000 == 1024000 ns */
> +    writel(TIMER_BASE + TIMER2LOAD, 1000);
> +    /* enable in periodic, wrapping, interrupt mode, prescale 256 */
> +    writel(TIMER_BASE + TIMER2CONTROL,
> +           CTRL_ENABLE | CTRL_INTEN | CTRL_PERIODIC | CTRL_PRESCALE_256);
> +
> +    /* Step to just past the 500th tick and check VALUE */
> +    clock_step(40 * 256 * 501);
> +    g_assert_cmpuint(readl(TIMER_BASE + TIMER2RIS), ==, 0);
> +    g_assert_cmpuint(readl(TIMER_BASE + TIMER2VALUE), ==, 500);
> +
> +    /* Just past the 1000th tick: timer should have fired */
> +    clock_step(40 * 256 * 500);
> +    g_assert_cmpuint(readl(TIMER_BASE + TIMER2RIS), ==, 1);
> +    g_assert_cmpuint(readl(TIMER_BASE + TIMER2VALUE), ==, 0);
> +
> +    /* In periodic mode the tick VALUE now reloads */
> +    clock_step(40 * 256);
> +    g_assert_cmpuint(readl(TIMER_BASE + TIMER2VALUE), ==, 1000);
> +
> +    /* Check that any write to INTCLR clears interrupt */
> +    writel(TIMER_BASE + TIMER2INTCLR, 1);
> +    g_assert_cmpuint(readl(TIMER_BASE + TIMER2RIS), ==, 0);
> +
> +    /* Turn off the timer */
> +    writel(TIMER_BASE + TIMER2CONTROL, 0);
> +}
> +
> +int main(int argc, char **argv)
> +{
> +    int r;
> +
> +    g_test_init(&argc, &argv, NULL);
> +
> +    qtest_start("-machine mps2-an385");
> +
> +    qtest_add_func("/cmsdk-apb-dualtimer/dualtimer", test_dualtimer);
> +    qtest_add_func("/cmsdk-apb-dualtimer/prescale", test_prescale);
> +
> +    r = g_test_run();
> +
> +    qtest_end();
> +
> +    return r;
> +}
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 3729b89f359..154a91d12e5 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -584,6 +584,7 @@ F: include/hw/timer/cmsdk-apb-timer.h
>  F: tests/qtest/cmsdk-apb-timer-test.c
>  F: hw/timer/cmsdk-apb-dualtimer.c
>  F: include/hw/timer/cmsdk-apb-dualtimer.h
> +F: tests/qtest/cmsdk-apb-dualtimer-test.c
>  F: hw/char/cmsdk-apb-uart.c
>  F: include/hw/char/cmsdk-apb-uart.h
>  F: hw/watchdog/cmsdk-apb-watchdog.c
> diff --git a/tests/qtest/meson.build b/tests/qtest/meson.build
> index 9e2ebc47041..69dd4a8547c 100644
> --- a/tests/qtest/meson.build
> +++ b/tests/qtest/meson.build
> @@ -141,6 +141,7 @@ qtests_npcm7xx = \
>     'npcm7xx_timer-test',
>     'npcm7xx_watchdog_timer-test']
>  qtests_arm = \
> +  (config_all_devices.has_key('CONFIG_CMSDK_APB_DUALTIMER') ? 
> ['cmsdk-apb-dualtimer-test'] : []) + \
>    (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'] 
> : []) +         \
> -- 
> 2.20.1
> 

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