tests/m48t59-test.c

   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 #include "libqtest.h"
  15
  16 #include <glib.h>
  17 #include <stdio.h>
  18 #include <string.h>
  19 #include <stdlib.h>
  20 #include <unistd.h>
  21
  22 #define RTC_SECONDS             0x9
  23 #define RTC_MINUTES             0xa
  24 #define RTC_HOURS               0xb
  25
  26 #define RTC_DAY_OF_WEEK         0xc
  27 #define RTC_DAY_OF_MONTH        0xd
  28 #define RTC_MONTH               0xe
  29 #define RTC_YEAR                0xf
  30
  31 static uint32_t base;
  32 static uint16_t reg_base = 0x1ff0; /* 0x7f0 for m48t02 */
  33 static int base_year;
  34 static bool use_mmio;
  35
  36 static uint8_t cmos_read_mmio(uint8_t reg)
  37 {
  38     return readb(base + (uint32_t)reg_base + (uint32_t)reg);
  39 }
  40
  41 static void cmos_write_mmio(uint8_t reg, uint8_t val)
  42 {
  43     uint8_t data = val;
  44
  45     writeb(base + (uint32_t)reg_base + (uint32_t)reg, data);
  46 }
  47
  48 static uint8_t cmos_read_ioio(uint8_t reg)
  49 {
  50     outw(base + 0, reg_base + (uint16_t)reg);
  51     return inb(base + 3);
  52 }
  53
  54 static void cmos_write_ioio(uint8_t reg, uint8_t val)
  55 {
  56     outw(base + 0, reg_base + (uint16_t)reg);
  57     outb(base + 3, val);
  58 }
  59
  60 static uint8_t cmos_read(uint8_t reg)
  61 {
  62     if (use_mmio) {
  63         return cmos_read_mmio(reg);
  64     } else {
  65         return cmos_read_ioio(reg);
  66     }
  67 }
  68
  69 static void cmos_write(uint8_t reg, uint8_t val)
  70 {
  71     if (use_mmio) {
  72         cmos_write_mmio(reg, val);
  73     } else {
  74         cmos_write_ioio(reg, val);
  75     }
  76 }
  77
  78 static int bcd2dec(int value)
  79 {
  80     return (((value >> 4) & 0x0F) * 10) + (value & 0x0F);
  81 }
  82
  83 static int tm_cmp(struct tm *lhs, struct tm *rhs)
  84 {
  85     time_t a, b;
  86     struct tm d1, d2;
  87
  88     memcpy(&d1, lhs, sizeof(d1));
  89     memcpy(&d2, rhs, sizeof(d2));
  90
  91     a = mktime(&d1);
  92     b = mktime(&d2);
  93
  94     if (a < b) {
  95         return -1;
  96     } else if (a > b) {
  97         return 1;
  98     }
  99
 100     return 0;
 101 }
 102
 103 #if 0
 104 static void print_tm(struct tm *tm)
 105 {
 106     printf("%04d-%02d-%02d %02d:%02d:%02d %+02ld\n",
 107            tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
 108            tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_gmtoff);
 109 }
 110 #endif
 111
 112 static void cmos_get_date_time(struct tm *date)
 113 {
 114     int sec, min, hour, mday, mon, year;
 115     time_t ts;
 116     struct tm dummy;
 117
 118     sec = cmos_read(RTC_SECONDS);
 119     min = cmos_read(RTC_MINUTES);
 120     hour = cmos_read(RTC_HOURS);
 121     mday = cmos_read(RTC_DAY_OF_MONTH);
 122     mon = cmos_read(RTC_MONTH);
 123     year = cmos_read(RTC_YEAR);
 124
 125     sec = bcd2dec(sec);
 126     min = bcd2dec(min);
 127     hour = bcd2dec(hour);
 128     mday = bcd2dec(mday);
 129     mon = bcd2dec(mon);
 130     year = bcd2dec(year);
 131
 132     ts = time(NULL);
 133     localtime_r(&ts, &dummy);
 134
 135     date->tm_isdst = dummy.tm_isdst;
 136     date->tm_sec = sec;
 137     date->tm_min = min;
 138     date->tm_hour = hour;
 139     date->tm_mday = mday;
 140     date->tm_mon = mon - 1;
 141     date->tm_year = base_year + year - 1900;
 142 #ifndef __sun__
 143     date->tm_gmtoff = 0;
 144 #endif
 145
 146     ts = mktime(date);
 147 }
 148
 149 static void check_time(int wiggle)
 150 {
 151     struct tm start, date[4], end;
 152     struct tm *datep;
 153     time_t ts;
 154
 155     /*
 156      * This check assumes a few things.  First, we cannot guarantee that we get
 157      * a consistent reading from the wall clock because we may hit an edge of
 158      * the clock while reading.  To work around this, we read four clock readings
 159      * such that at least two of them should match.  We need to assume that one
 160      * reading is corrupt so we need four readings to ensure that we have at
 161      * least two consecutive identical readings
 162      *
 163      * It's also possible that we'll cross an edge reading the host clock so
 164      * simply check to make sure that the clock reading is within the period of
 165      * when we expect it to be.
 166      */
 167
 168     ts = time(NULL);
 169     gmtime_r(&ts, &start);
 170
 171     cmos_get_date_time(&date[0]);
 172     cmos_get_date_time(&date[1]);
 173     cmos_get_date_time(&date[2]);
 174     cmos_get_date_time(&date[3]);
 175
 176     ts = time(NULL);
 177     gmtime_r(&ts, &end);
 178
 179     if (tm_cmp(&date[0], &date[1]) == 0) {
 180         datep = &date[0];
 181     } else if (tm_cmp(&date[1], &date[2]) == 0) {
 182         datep = &date[1];
 183     } else if (tm_cmp(&date[2], &date[3]) == 0) {
 184         datep = &date[2];
 185     } else {
 186         g_assert_not_reached();
 187     }
 188
 189     if (!(tm_cmp(&start, datep) <= 0 && tm_cmp(datep, &end) <= 0)) {
 190         long t, s;
 191
 192         start.tm_isdst = datep->tm_isdst;
 193
 194         t = (long)mktime(datep);
 195         s = (long)mktime(&start);
 196         if (t < s) {
 197             g_test_message("RTC is %ld second(s) behind wall-clock\n", (s - t));
 198         } else {
 199             g_test_message("RTC is %ld second(s) ahead of wall-clock\n", (t - s));
 200         }
 201
 202         g_assert_cmpint(ABS(t - s), <=, wiggle);
 203     }
 204 }
 205
 206 static int wiggle = 2;
 207
 208 static void bcd_check_time(void)
 209 {
 210     if (strcmp(qtest_get_arch(), "sparc64") == 0) {
 211         base = 0x74;
 212         base_year = 1900;
 213         use_mmio = false;
 214     } else if (strcmp(qtest_get_arch(), "sparc") == 0) {
 215         base = 0x71200000;
 216         base_year = 1968;
 217         use_mmio = true;
 218     } else { /* PPC: need to map macio in PCI */
 219         g_assert_not_reached();
 220     }
 221     check_time(wiggle);
 222 }
 223
 224 /* success if no crash or abort */
 225 static void fuzz_registers(void)
 226 {
 227     unsigned int i;
 228
 229     for (i = 0; i < 1000; i++) {
 230         uint8_t reg, val;
 231
 232         reg = (uint8_t)g_test_rand_int_range(0, 16);
 233         val = (uint8_t)g_test_rand_int_range(0, 256);
 234
 235         if (reg == 7) {
 236             /* watchdog setup register, may trigger system reset, skip */
 237             continue;
 238         }
 239
 240         cmos_write(reg, val);
 241         cmos_read(reg);
 242     }
 243 }
 244
 245 int main(int argc, char **argv)
 246 {
 247     QTestState *s = NULL;
 248     int ret;
 249
 250     g_test_init(&argc, &argv, NULL);
 251
 252     s = qtest_start("-rtc clock=vm");
 253
 254     qtest_add_func("/rtc/bcd/check-time", bcd_check_time);
 255     qtest_add_func("/rtc/fuzz-registers", fuzz_registers);
 256     ret = g_test_run();
 257
 258     if (s) {
 259         qtest_quit(s);
 260     }
 261
 262     return ret;
 263 }