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 "qemu/bitops.h" 19 #include "libqtest-single.h" 20 21 /* 22 * lm3s811evb watchdog; at board startup this runs at 200MHz / 16 == 12.5MHz, 23 * which is 80ns per tick. 24 */ 25 #define WDOG_BASE 0x40000000 26 27 #define WDOGLOAD 0 28 #define WDOGVALUE 4 29 #define WDOGCONTROL 8 30 #define WDOGINTCLR 0xc 31 #define WDOGRIS 0x10 32 #define WDOGMIS 0x14 33 #define WDOGLOCK 0xc00 34 35 #define SSYS_BASE 0x400fe000 36 #define RCC 0x60 37 #define SYSDIV_SHIFT 23 38 #define SYSDIV_LENGTH 4 39 40 static void test_watchdog(void) 41 { 42 g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 0); 43 44 writel(WDOG_BASE + WDOGCONTROL, 1); 45 writel(WDOG_BASE + WDOGLOAD, 1000); 46 47 /* Step to just past the 500th tick */ 48 clock_step(500 * 80 + 1); 49 g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 0); 50 g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 500); 51 52 /* Just past the 1000th tick: timer should have fired */ 53 clock_step(500 * 80); 54 g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 1); 55 g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 0); 56 57 /* VALUE reloads at following tick */ 58 clock_step(80); 59 g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 1000); 60 61 /* Writing any value to WDOGINTCLR clears the interrupt and reloads */ 62 clock_step(500 * 80); 63 g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 500); 64 g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 1); 65 writel(WDOG_BASE + WDOGINTCLR, 0); 66 g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 1000); 67 g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 0); 68 } 69 70 static void test_clock_change(void) 71 { 72 uint32_t rcc; 73 74 /* 75 * Test that writing to the stellaris board's RCC register to 76 * change the system clock frequency causes the watchdog 77 * to change the speed it counts at. 78 */ 79 g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 0); 80 81 writel(WDOG_BASE + WDOGCONTROL, 1); 82 writel(WDOG_BASE + WDOGLOAD, 1000); 83 84 /* Step to just past the 500th tick */ 85 clock_step(80 * 500 + 1); 86 g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 0); 87 g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 500); 88 89 /* Rewrite RCC.SYSDIV from 16 to 8, so the clock is now 40ns per tick */ 90 rcc = readl(SSYS_BASE + RCC); 91 g_assert_cmpuint(extract32(rcc, SYSDIV_SHIFT, SYSDIV_LENGTH), ==, 0xf); 92 rcc = deposit32(rcc, SYSDIV_SHIFT, SYSDIV_LENGTH, 7); 93 writel(SSYS_BASE + RCC, rcc); 94 95 /* Just past the 1000th tick: timer should have fired */ 96 clock_step(40 * 500); 97 g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 1); 98 99 g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 0); 100 101 /* VALUE reloads at following tick */ 102 clock_step(41); 103 g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 1000); 104 105 /* Writing any value to WDOGINTCLR clears the interrupt and reloads */ 106 clock_step(40 * 500); 107 g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 500); 108 g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 1); 109 writel(WDOG_BASE + WDOGINTCLR, 0); 110 g_assert_cmpuint(readl(WDOG_BASE + WDOGVALUE), ==, 1000); 111 g_assert_cmpuint(readl(WDOG_BASE + WDOGRIS), ==, 0); 112 } 113 114 int main(int argc, char **argv) 115 { 116 int r; 117 118 g_test_init(&argc, &argv, NULL); 119 120 qtest_start("-machine lm3s811evb"); 121 122 qtest_add_func("/cmsdk-apb-watchdog/watchdog", test_watchdog); 123 qtest_add_func("/cmsdk-apb-watchdog/watchdog_clock_change", 124 test_clock_change); 125 126 r = g_test_run(); 127 128 qtest_end(); 129 130 return r; 131 } 132