tests/qtest/cmsdk-apb-timer-test.c

   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 }