1 /* 2 * QTest testcase for the CMSDK APB timer 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 /* IoTKit/ARMSSE-200 timer0; driven at 25MHz in mps2-an385, so 40ns per tick */ 21 #define TIMER_BASE 0x40000000 22 23 #define CTRL 0 24 #define VALUE 4 25 #define RELOAD 8 26 #define INTSTATUS 0xc 27 28 static void test_timer(void) 29 { 30 g_assert_true(readl(TIMER_BASE + INTSTATUS) == 0); 31 32 /* Start timer: will fire after 40 * 1000 == 40000 ns */ 33 writel(TIMER_BASE + RELOAD, 1000); 34 writel(TIMER_BASE + CTRL, 9); 35 36 /* Step to just past the 500th tick and check VALUE */ 37 clock_step(40 * 500 + 1); 38 g_assert_cmpuint(readl(TIMER_BASE + INTSTATUS), ==, 0); 39 g_assert_cmpuint(readl(TIMER_BASE + VALUE), ==, 500); 40 41 /* Just past the 1000th tick: timer should have fired */ 42 clock_step(40 * 500); 43 g_assert_cmpuint(readl(TIMER_BASE + INTSTATUS), ==, 1); 44 g_assert_cmpuint(readl(TIMER_BASE + VALUE), ==, 0); 45 46 /* VALUE reloads at the following tick */ 47 clock_step(40); 48 g_assert_cmpuint(readl(TIMER_BASE + VALUE), ==, 1000); 49 50 /* Check write-1-to-clear behaviour of INTSTATUS */ 51 writel(TIMER_BASE + INTSTATUS, 0); 52 g_assert_cmpuint(readl(TIMER_BASE + INTSTATUS), ==, 1); 53 writel(TIMER_BASE + INTSTATUS, 1); 54 g_assert_cmpuint(readl(TIMER_BASE + INTSTATUS), ==, 0); 55 56 /* Turn off the timer */ 57 writel(TIMER_BASE + CTRL, 0); 58 } 59 60 int main(int argc, char **argv) 61 { 62 int r; 63 64 g_test_init(&argc, &argv, NULL); 65 66 qtest_start("-machine mps2-an385"); 67 68 qtest_add_func("/cmsdk-apb-timer/timer", test_timer); 69 70 r = g_test_run(); 71 72 qtest_end(); 73 74 return r; 75 } 76