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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
48 static 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_cmphex(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
82 static 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
114 int 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 }