1 /* 2 * QTest testcase for the CMSDK APB watchdog device 3 * 4 * Copyright (c) 2021 Linaro Limited 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * for more details. 15 */ 16 17 #include "qemu/osdep.h" 18 #include "libqtest-single.h" 19 20 /* 21 * lm3s811evb watchdog; at board startup this runs at 200MHz / 16 == 12.5MHz, 22 * which is 80ns per tick. 23 */ 24 #define WDOG_BASE 0x40000000 25 26 #define WDOGLOAD 0 27 #define WDOGVALUE 4 28 #define WDOGCONTROL 8 29 #define WDOGINTCLR 0xc 30 #define WDOGRIS 0x10 31 #define WDOGMIS 0x14 32 #define WDOGLOCK 0xc00 33 34 static void test_watchdog(void) 35 { 36 g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 0); 37 38 writel(WDOG_BASE + WDOGCONTROL, 1); 39 writel(WDOG_BASE + WDOGLOAD, 1000); 40 41 /* Step to just past the 500th tick */ 42 clock_step(500 * 80 + 1); 43 g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 0); 44 g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 500); 45 46 /* Just past the 1000th tick: timer should have fired */ 47 clock_step(500 * 80); 48 g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 1); 49 g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 0); 50 51 /* VALUE reloads at following tick */ 52 clock_step(80); 53 g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 1000); 54 55 /* Writing any value to WDOGINTCLR clears the interrupt and reloads */ 56 clock_step(500 * 80); 57 g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 500); 58 g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 1); 59 writel(WDOG_BASE + WDOGINTCLR, 0); 60 g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 1000); 61 g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 0); 62 } 63 64 int main(int argc, char **argv) 65 { 66 int r; 67 68 g_test_init(&argc, &argv, NULL); 69 70 qtest_start("-machine lm3s811evb"); 71 72 qtest_add_func("/cmsdk-apb-watchdog/watchdog", test_watchdog); 73 74 r = g_test_run(); 75 76 qtest_end(); 77 78 return r; 79 } 80