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/*
* 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 "exec/hwaddr.h"
#include "qemu/bitops.h"
#include "libqtest-single.h"
#define WDOG_BASE 0x40000000
#define WDOG_BASE_MPS2 0x40008000
#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
#define WDOGLOAD_DEFAULT 0xFFFFFFFF
#define WDOGVALUE_DEFAULT 0xFFFFFFFF
typedef struct CMSDKAPBWatchdogTestArgs {
int64_t tick;
hwaddr wdog_base;
const char *machine;
} CMSDKAPBWatchdogTestArgs;
enum {
MACHINE_LM3S811EVB,
MACHINE_MPS2_AN385,
};
/*
* lm3s811evb watchdog; at board startup this runs at 200MHz / 16 == 12.5MHz,
* which is 80ns per tick.
*
* IoTKit/ARMSSE dualtimer; driven at 25MHz in mps2-an385, so 40ns per tick
*/
static const CMSDKAPBWatchdogTestArgs machine_info[] = {
[MACHINE_LM3S811EVB] = {
.tick = 80,
.wdog_base = WDOG_BASE,
.machine = "lm3s811evb",
},
[MACHINE_MPS2_AN385] = {
.tick = 40,
.wdog_base = WDOG_BASE_MPS2,
.machine = "mps2-an385",
},
};
static void test_watchdog(const void *ptr)
{
const CMSDKAPBWatchdogTestArgs *args = ptr;
hwaddr wdog_base = args->wdog_base;
int64_t tick = args->tick;
g_autofree gchar *cmdline = g_strdup_printf("-machine %s", args->machine);
qtest_start(cmdline);
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 * tick + 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 * tick);
g_assert_cmpuint(readl(wdog_base + WDOGRIS), ==, 1);
g_assert_cmpuint(readl(wdog_base + WDOGVALUE), ==, 0);
/* VALUE reloads at following tick */
clock_step(tick);
g_assert_cmpuint(readl(wdog_base + WDOGVALUE), ==, 1000);
/* Writing any value to WDOGINTCLR clears the interrupt and reloads */
clock_step(500 * tick);
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);
qtest_end();
}
/*
* This test can only be executed in the stellaris board since it relies on a
* component of the board to change the clocking parameters of the watchdog.
*/
static void test_clock_change(const void *ptr)
{
uint32_t rcc;
const CMSDKAPBWatchdogTestArgs *args = ptr;
g_autofree gchar *cmdline = g_strdup_printf("-machine %s", args->machine);
qtest_start(cmdline);
/*
* 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_cmphex(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);
qtest_end();
}
int main(int argc, char **argv)
{
int r;
g_test_init(&argc, &argv, NULL);
if (qtest_has_machine(machine_info[MACHINE_LM3S811EVB].machine)) {
qtest_add_data_func("/cmsdk-apb-watchdog/watchdog",
&machine_info[MACHINE_LM3S811EVB], test_watchdog);
qtest_add_data_func("/cmsdk-apb-watchdog/watchdog_clock_change",
&machine_info[MACHINE_LM3S811EVB],
test_clock_change);
}
if (qtest_has_machine(machine_info[MACHINE_MPS2_AN385].machine)) {
qtest_add_data_func("/cmsdk-apb-watchdog/watchdog_mps2",
&machine_info[MACHINE_MPS2_AN385], test_watchdog);
}
r = g_test_run();
return r;
}
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