| 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 | } |