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7bbb12f305
Now that the CMSDK APB watchdog uses its Clock input, it will correctly respond when the system clock frequency is changed using the RCC register on in the Stellaris board system registers. Test that when the RCC register is written it causes the watchdog timer to change speed. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Luc Michel <luc@lmichel.fr> Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-id: 20210128114145.20536-22-peter.maydell@linaro.org Message-id: 20210121190622.22000-22-peter.maydell@linaro.org
131 lines
4 KiB
C
131 lines
4 KiB
C
/*
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* QTest testcase for the CMSDK APB watchdog device
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*
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* Copyright (c) 2021 Linaro Limited
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "qemu/osdep.h"
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#include "qemu/bitops.h"
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#include "libqtest-single.h"
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/*
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* lm3s811evb watchdog; at board startup this runs at 200MHz / 16 == 12.5MHz,
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* which is 80ns per tick.
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*/
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#define WDOG_BASE 0x40000000
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#define WDOGLOAD 0
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#define WDOGVALUE 4
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#define WDOGCONTROL 8
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#define WDOGINTCLR 0xc
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#define WDOGRIS 0x10
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#define WDOGMIS 0x14
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#define WDOGLOCK 0xc00
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#define SSYS_BASE 0x400fe000
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#define RCC 0x60
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#define SYSDIV_SHIFT 23
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#define SYSDIV_LENGTH 4
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static void test_watchdog(void)
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{
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g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 0);
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writel(WDOG_BASE + WDOGCONTROL, 1);
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writel(WDOG_BASE + WDOGLOAD, 1000);
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/* Step to just past the 500th tick */
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clock_step(500 * 80 + 1);
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g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 0);
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g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 500);
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/* Just past the 1000th tick: timer should have fired */
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clock_step(500 * 80);
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g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 1);
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g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 0);
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/* VALUE reloads at following tick */
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clock_step(80);
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g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 1000);
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/* Writing any value to WDOGINTCLR clears the interrupt and reloads */
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clock_step(500 * 80);
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g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 500);
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g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 1);
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writel(WDOG_BASE + WDOGINTCLR, 0);
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g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 1000);
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g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 0);
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}
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static void test_clock_change(void)
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{
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uint32_t rcc;
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/*
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* Test that writing to the stellaris board's RCC register to
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* change the system clock frequency causes the watchdog
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* to change the speed it counts at.
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*/
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g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 0);
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writel(WDOG_BASE + WDOGCONTROL, 1);
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writel(WDOG_BASE + WDOGLOAD, 1000);
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/* Step to just past the 500th tick */
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clock_step(80 * 500 + 1);
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g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 0);
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g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 500);
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/* Rewrite RCC.SYSDIV from 16 to 8, so the clock is now 40ns per tick */
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rcc = readl(SSYS_BASE + RCC);
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g_assert_cmpuint(extract32(rcc, SYSDIV_SHIFT, SYSDIV_LENGTH), ==, 0xf);
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rcc = deposit32(rcc, SYSDIV_SHIFT, SYSDIV_LENGTH, 7);
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writel(SSYS_BASE + RCC, rcc);
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/* Just past the 1000th tick: timer should have fired */
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clock_step(40 * 500);
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g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 1);
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g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 0);
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/* VALUE reloads at following tick */
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clock_step(41);
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g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 1000);
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/* Writing any value to WDOGINTCLR clears the interrupt and reloads */
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clock_step(40 * 500);
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g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 500);
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g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 1);
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writel(WDOG_BASE + WDOGINTCLR, 0);
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g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 1000);
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g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 0);
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}
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int main(int argc, char **argv)
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{
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int r;
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g_test_init(&argc, &argv, NULL);
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qtest_start("-machine lm3s811evb");
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qtest_add_func("/cmsdk-apb-watchdog/watchdog", test_watchdog);
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qtest_add_func("/cmsdk-apb-watchdog/watchdog_clock_change",
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test_clock_change);
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r = g_test_run();
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qtest_end();
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return r;
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}
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