131 lines
4 KiB
C
131 lines
4 KiB
C
/*
|
|
* 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 "qemu/bitops.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
|
|
|
|
#define SSYS_BASE 0x400fe000
|
|
#define RCC 0x60
|
|
#define SYSDIV_SHIFT 23
|
|
#define SYSDIV_LENGTH 4
|
|
|
|
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);
|
|
}
|
|
|
|
static void test_clock_change(void)
|
|
{
|
|
uint32_t rcc;
|
|
|
|
/*
|
|
* Test that writing to the stellaris board's RCC register to
|
|
* change the system clock frequency causes the watchdog
|
|
* to change the speed it counts at.
|
|
*/
|
|
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(80 * 500 + 1);
|
|
g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 0);
|
|
g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 500);
|
|
|
|
/* Rewrite RCC.SYSDIV from 16 to 8, so the clock is now 40ns per tick */
|
|
rcc = readl(SSYS_BASE + RCC);
|
|
g_assert_cmpuint(extract32(rcc, SYSDIV_SHIFT, SYSDIV_LENGTH), ==, 0xf);
|
|
rcc = deposit32(rcc, SYSDIV_SHIFT, SYSDIV_LENGTH, 7);
|
|
writel(SSYS_BASE + RCC, rcc);
|
|
|
|
/* Just past the 1000th tick: timer should have fired */
|
|
clock_step(40 * 500);
|
|
g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 1);
|
|
|
|
g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 0);
|
|
|
|
/* VALUE reloads at following tick */
|
|
clock_step(41);
|
|
g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 1000);
|
|
|
|
/* Writing any value to WDOGINTCLR clears the interrupt and reloads */
|
|
clock_step(40 * 500);
|
|
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)
|
|
{
|
|
int r;
|
|
|
|
g_test_init(&argc, &argv, NULL);
|
|
|
|
qtest_start("-machine lm3s811evb");
|
|
|
|
qtest_add_func("/cmsdk-apb-watchdog/watchdog", test_watchdog);
|
|
qtest_add_func("/cmsdk-apb-watchdog/watchdog_clock_change",
|
|
test_clock_change);
|
|
|
|
r = g_test_run();
|
|
|
|
qtest_end();
|
|
|
|
return r;
|
|
}
|