xref: /openbmc/qemu/tests/qtest/m48t59-test.c (revision f0984d40) 
1 /*
2  * QTest testcase for the M48T59 and M48T08 real-time clocks
3  *
4  * Based on MC146818 RTC test:
5  * Copyright IBM, Corp. 2012
6  *
7  * Authors:
8  *  Anthony Liguori   <aliguori@us.ibm.com>
9  *
10  * This work is licensed under the terms of the GNU GPL, version 2 or later.
11  * See the COPYING file in the top-level directory.
12  *
13  */
14 
15 #include "qemu/osdep.h"
16 
17 #include "libqtest.h"
18 
19 #define RTC_SECONDS             0x9
20 #define RTC_MINUTES             0xa
21 #define RTC_HOURS               0xb
22 
23 #define RTC_DAY_OF_WEEK         0xc
24 #define RTC_DAY_OF_MONTH        0xd
25 #define RTC_MONTH               0xe
26 #define RTC_YEAR                0xf
27 
28 static uint32_t base;
29 static uint16_t reg_base = 0x1ff0; /* 0x7f0 for m48t02 */
30 static int base_year;
31 static const char *base_machine;
32 static bool use_mmio;
33 
34 static uint8_t cmos_read_mmio(QTestState *s, uint8_t reg)
35 {
36     return qtest_readb(s, base + (uint32_t)reg_base + (uint32_t)reg);
37 }
38 
39 static void cmos_write_mmio(QTestState *s, uint8_t reg, uint8_t val)
40 {
41     uint8_t data = val;
42 
43     qtest_writeb(s, base + (uint32_t)reg_base + (uint32_t)reg, data);
44 }
45 
46 static uint8_t cmos_read_ioio(QTestState *s, uint8_t reg)
47 {
48     qtest_outw(s, base + 0, reg_base + (uint16_t)reg);
49     return qtest_inb(s, base + 3);
50 }
51 
52 static void cmos_write_ioio(QTestState *s, uint8_t reg, uint8_t val)
53 {
54     qtest_outw(s, base + 0, reg_base + (uint16_t)reg);
55     qtest_outb(s, base + 3, val);
56 }
57 
58 static uint8_t cmos_read(QTestState *s, uint8_t reg)
59 {
60     if (use_mmio) {
61         return cmos_read_mmio(s, reg);
62     } else {
63         return cmos_read_ioio(s, reg);
64     }
65 }
66 
67 static void cmos_write(QTestState *s, uint8_t reg, uint8_t val)
68 {
69     if (use_mmio) {
70         cmos_write_mmio(s, reg, val);
71     } else {
72         cmos_write_ioio(s, reg, val);
73     }
74 }
75 
76 static int bcd2dec(int value)
77 {
78     return (((value >> 4) & 0x0F) * 10) + (value & 0x0F);
79 }
80 
81 static int tm_cmp(struct tm *lhs, struct tm *rhs)
82 {
83     time_t a, b;
84     struct tm d1, d2;
85 
86     memcpy(&d1, lhs, sizeof(d1));
87     memcpy(&d2, rhs, sizeof(d2));
88 
89     a = mktime(&d1);
90     b = mktime(&d2);
91 
92     if (a < b) {
93         return -1;
94     } else if (a > b) {
95         return 1;
96     }
97 
98     return 0;
99 }
100 
101 #if 0
102 static void print_tm(struct tm *tm)
103 {
104     printf("%04d-%02d-%02d %02d:%02d:%02d %+02ld\n",
105            tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
106            tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_gmtoff);
107 }
108 #endif
109 
110 static void cmos_get_date_time(QTestState *s, struct tm *date)
111 {
112     int sec, min, hour, mday, mon, year;
113     time_t ts;
114     struct tm dummy;
115 
116     sec = cmos_read(s, RTC_SECONDS);
117     min = cmos_read(s, RTC_MINUTES);
118     hour = cmos_read(s, RTC_HOURS);
119     mday = cmos_read(s, RTC_DAY_OF_MONTH);
120     mon = cmos_read(s, RTC_MONTH);
121     year = cmos_read(s, RTC_YEAR);
122 
123     sec = bcd2dec(sec);
124     min = bcd2dec(min);
125     hour = bcd2dec(hour);
126     mday = bcd2dec(mday);
127     mon = bcd2dec(mon);
128     year = bcd2dec(year);
129 
130     ts = time(NULL);
131     localtime_r(&ts, &dummy);
132 
133     date->tm_isdst = dummy.tm_isdst;
134     date->tm_sec = sec;
135     date->tm_min = min;
136     date->tm_hour = hour;
137     date->tm_mday = mday;
138     date->tm_mon = mon - 1;
139     date->tm_year = base_year + year - 1900;
140 #if !defined(__sun__) && !defined(_WIN32)
141     date->tm_gmtoff = 0;
142 #endif
143 
144     ts = mktime(date);
145 }
146 
147 static QTestState *m48t59_qtest_start(void)
148 {
149     return qtest_initf("-M %s -rtc clock=vm", base_machine);
150 }
151 
152 static void bcd_check_time(void)
153 {
154     struct tm start, date[4], end;
155     struct tm *datep;
156     time_t ts;
157     const int wiggle = 2;
158     QTestState *s = m48t59_qtest_start();
159 
160     /*
161      * This check assumes a few things.  First, we cannot guarantee that we get
162      * a consistent reading from the wall clock because we may hit an edge of
163      * the clock while reading.  To work around this, we read four clock readings
164      * such that at least two of them should match.  We need to assume that one
165      * reading is corrupt so we need four readings to ensure that we have at
166      * least two consecutive identical readings
167      *
168      * It's also possible that we'll cross an edge reading the host clock so
169      * simply check to make sure that the clock reading is within the period of
170      * when we expect it to be.
171      */
172 
173     ts = time(NULL);
174     gmtime_r(&ts, &start);
175 
176     cmos_get_date_time(s, &date[0]);
177     cmos_get_date_time(s, &date[1]);
178     cmos_get_date_time(s, &date[2]);
179     cmos_get_date_time(s, &date[3]);
180 
181     ts = time(NULL);
182     gmtime_r(&ts, &end);
183 
184     if (tm_cmp(&date[0], &date[1]) == 0) {
185         datep = &date[0];
186     } else if (tm_cmp(&date[1], &date[2]) == 0) {
187         datep = &date[1];
188     } else if (tm_cmp(&date[2], &date[3]) == 0) {
189         datep = &date[2];
190     } else {
191         g_assert_not_reached();
192     }
193 
194     if (!(tm_cmp(&start, datep) <= 0 && tm_cmp(datep, &end) <= 0)) {
195         long t, s;
196 
197         start.tm_isdst = datep->tm_isdst;
198 
199         t = (long)mktime(datep);
200         s = (long)mktime(&start);
201         if (t < s) {
202             g_test_message("RTC is %ld second(s) behind wall-clock", (s - t));
203         } else {
204             g_test_message("RTC is %ld second(s) ahead of wall-clock", (t - s));
205         }
206 
207         g_assert_cmpint(ABS(t - s), <=, wiggle);
208     }
209 
210     qtest_quit(s);
211 }
212 
213 /* success if no crash or abort */
214 static void fuzz_registers(void)
215 {
216     unsigned int i;
217     QTestState *s = m48t59_qtest_start();
218 
219     for (i = 0; i < 1000; i++) {
220         uint8_t reg, val;
221 
222         reg = (uint8_t)g_test_rand_int_range(0, 16);
223         val = (uint8_t)g_test_rand_int_range(0, 256);
224 
225         if (reg == 7) {
226             /* watchdog setup register, may trigger system reset, skip */
227             continue;
228         }
229 
230         cmos_write(s, reg, val);
231         cmos_read(s, reg);
232     }
233 
234     qtest_quit(s);
235 }
236 
237 static void base_setup(void)
238 {
239     const char *arch = qtest_get_arch();
240 
241     if (g_str_equal(arch, "sparc")) {
242         /* Note: For sparc64, we'd need to map-in the PCI bridge memory first */
243         base = 0x71200000;
244         base_year = 1968;
245         base_machine = "SS-5";
246         use_mmio = true;
247     } else if (g_str_equal(arch, "ppc") || g_str_equal(arch, "ppc64")) {
248         base = 0xF0000000;
249         base_year = 1968;
250         base_machine = "ref405ep";
251         use_mmio = true;
252     } else {
253         g_assert_not_reached();
254     }
255 }
256 
257 int main(int argc, char **argv)
258 {
259     base_setup();
260 
261     g_test_init(&argc, &argv, NULL);
262 
263     if (g_test_slow()) {
264         /* Do not run this in timing-sensitive environments */
265         qtest_add_func("/rtc/bcd-check-time", bcd_check_time);
266     }
267     qtest_add_func("/rtc/fuzz-registers", fuzz_registers);
268     return g_test_run();
269 }
270