LXR qemu/tests/qtest/cmsdk-apb-dualtimer-test.c

   1/*
   2 * QTest testcase for the CMSDK APB dualtimer 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 dualtimer; driven at 25MHz in mps2-an385, so 40ns per tick */
  21#define TIMER_BASE 0x40002000
  22
  23#define TIMER1LOAD 0
  24#define TIMER1VALUE 4
  25#define TIMER1CONTROL 8
  26#define TIMER1INTCLR 0xc
  27#define TIMER1RIS 0x10
  28#define TIMER1MIS 0x14
  29#define TIMER1BGLOAD 0x18
  30
  31#define TIMER2LOAD 0x20
  32#define TIMER2VALUE 0x24
  33#define TIMER2CONTROL 0x28
  34#define TIMER2INTCLR 0x2c
  35#define TIMER2RIS 0x30
  36#define TIMER2MIS 0x34
  37#define TIMER2BGLOAD 0x38
  38
  39#define CTRL_ENABLE (1 << 7)
  40#define CTRL_PERIODIC (1 << 6)
  41#define CTRL_INTEN (1 << 5)
  42#define CTRL_PRESCALE_1 (0 << 2)
  43#define CTRL_PRESCALE_16 (1 << 2)
  44#define CTRL_PRESCALE_256 (2 << 2)
  45#define CTRL_32BIT (1 << 1)
  46#define CTRL_ONESHOT (1 << 0)
  47
  48static void test_dualtimer(void)
  49{
  50    g_assert_true(readl(TIMER_BASE + TIMER1RIS) == 0);
  51
  52    /* Start timer: will fire after 40000 ns */
  53    writel(TIMER_BASE + TIMER1LOAD, 1000);
  54    /* enable in free-running, wrapping, interrupt mode */
  55    writel(TIMER_BASE + TIMER1CONTROL, CTRL_ENABLE | CTRL_INTEN);
  56
  57    /* Step to just past the 500th tick and check VALUE */
  58    clock_step(500 * 40 + 1);
  59    g_assert_cmpuint(readl(TIMER_BASE + TIMER1RIS), ==, 0);
  60    g_assert_cmpuint(readl(TIMER_BASE + TIMER1VALUE), ==, 500);
  61
  62    /* Just past the 1000th tick: timer should have fired */
  63    clock_step(500 * 40);
  64    g_assert_cmpuint(readl(TIMER_BASE + TIMER1RIS), ==, 1);
  65    g_assert_cmpuint(readl(TIMER_BASE + TIMER1VALUE), ==, 0);
  66
  67    /*
  68     * We are in free-running wrapping 16-bit mode, so on the following
  69     * tick VALUE should have wrapped round to 0xffff.
  70     */
  71    clock_step(40);
  72    g_assert_cmpuint(readl(TIMER_BASE + TIMER1VALUE), ==, 0xffff);
  73
  74    /* Check that any write to INTCLR clears interrupt */
  75    writel(TIMER_BASE + TIMER1INTCLR, 1);
  76    g_assert_cmpuint(readl(TIMER_BASE + TIMER1RIS), ==, 0);
  77
  78    /* Turn off the timer */
  79    writel(TIMER_BASE + TIMER1CONTROL, 0);
  80}
  81
  82static void test_prescale(void)
  83{
  84    g_assert_true(readl(TIMER_BASE + TIMER2RIS) == 0);
  85
  86    /* Start timer: will fire after 40 * 256 * 1000 == 1024000 ns */
  87    writel(TIMER_BASE + TIMER2LOAD, 1000);
  88    /* enable in periodic, wrapping, interrupt mode, prescale 256 */
  89    writel(TIMER_BASE + TIMER2CONTROL,
  90           CTRL_ENABLE | CTRL_INTEN | CTRL_PERIODIC | CTRL_PRESCALE_256);
  91
  92    /* Step to just past the 500th tick and check VALUE */
  93    clock_step(40 * 256 * 501);
  94    g_assert_cmpuint(readl(TIMER_BASE + TIMER2RIS), ==, 0);
  95    g_assert_cmpuint(readl(TIMER_BASE + TIMER2VALUE), ==, 500);
  96
  97    /* Just past the 1000th tick: timer should have fired */
  98    clock_step(40 * 256 * 500);
  99    g_assert_cmpuint(readl(TIMER_BASE + TIMER2RIS), ==, 1);
 100    g_assert_cmpuint(readl(TIMER_BASE + TIMER2VALUE), ==, 0);
 101
 102    /* In periodic mode the tick VALUE now reloads */
 103    clock_step(40 * 256);
 104    g_assert_cmpuint(readl(TIMER_BASE + TIMER2VALUE), ==, 1000);
 105
 106    /* Check that any write to INTCLR clears interrupt */
 107    writel(TIMER_BASE + TIMER2INTCLR, 1);
 108    g_assert_cmpuint(readl(TIMER_BASE + TIMER2RIS), ==, 0);
 109
 110    /* Turn off the timer */
 111    writel(TIMER_BASE + TIMER2CONTROL, 0);
 112}
 113
 114int main(int argc, char **argv)
 115{
 116    int r;
 117
 118    g_test_init(&argc, &argv, NULL);
 119
 120    qtest_start("-machine mps2-an385");
 121
 122    qtest_add_func("/cmsdk-apb-dualtimer/dualtimer", test_dualtimer);
 123    qtest_add_func("/cmsdk-apb-dualtimer/prescale", test_prescale);
 124
 125    r = g_test_run();
 126
 127    qtest_end();
 128
 129    return r;
 130}
 131