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
  15 #include <glib.h>
  16 #include <stdio.h>
  17 #include <string.h>
  18 #include <stdlib.h>
  19 #include <unistd.h>
  20
  21 #include "libqtest.h"
  22
  23 #define RTC_SECONDS             0x9
  24 #define RTC_MINUTES             0xa
  25 #define RTC_HOURS               0xb
  26
  27 #define RTC_DAY_OF_WEEK         0xc
  28 #define RTC_DAY_OF_MONTH        0xd
  29 #define RTC_MONTH               0xe
  30 #define RTC_YEAR                0xf
  31
  32 static uint32_t base;
  33 static uint16_t reg_base = 0x1ff0; /* 0x7f0 for m48t02 */
  34 static int base_year;
  35 static bool use_mmio;
  36
  37 static uint8_t cmos_read_mmio(uint8_t reg)
  38 {
  39     return readb(base + (uint32_t)reg_base + (uint32_t)reg);
  40 }
  41
  42 static void cmos_write_mmio(uint8_t reg, uint8_t val)
  43 {
  44     uint8_t data = val;
  45
  46     writeb(base + (uint32_t)reg_base + (uint32_t)reg, data);
  47 }
  48
  49 static uint8_t cmos_read_ioio(uint8_t reg)
  50 {
  51     outw(base + 0, reg_base + (uint16_t)reg);
  52     return inb(base + 3);
  53 }
  54
  55 static void cmos_write_ioio(uint8_t reg, uint8_t val)
  56 {
  57     outw(base + 0, reg_base + (uint16_t)reg);
  58     outb(base + 3, val);
  59 }
  60
  61 static uint8_t cmos_read(uint8_t reg)
  62 {
  63     if (use_mmio) {
  64         return cmos_read_mmio(reg);
  65     } else {
  66         return cmos_read_ioio(reg);
  67     }
  68 }
  69
  70 static void cmos_write(uint8_t reg, uint8_t val)
  71 {
  72     if (use_mmio) {
  73         cmos_write_mmio(reg, val);
  74     } else {
  75         cmos_write_ioio(reg, val);
  76     }
  77 }
  78
  79 static int bcd2dec(int value)
  80 {
  81     return (((value >> 4) & 0x0F) * 10) + (value & 0x0F);
  82 }
  83
  84 static int tm_cmp(struct tm *lhs, struct tm *rhs)
  85 {
  86     time_t a, b;
  87     struct tm d1, d2;
  88
  89     memcpy(&d1, lhs, sizeof(d1));
  90     memcpy(&d2, rhs, sizeof(d2));
  91
  92     a = mktime(&d1);
  93     b = mktime(&d2);
  94
  95     if (a < b) {
  96         return -1;
  97     } else if (a > b) {
  98         return 1;
  99     }
 100
 101     return 0;
 102 }
 103
 104 #if 0
 105 static void print_tm(struct tm *tm)
 106 {
 107     printf("%04d-%02d-%02d %02d:%02d:%02d %+02ld\n",
 108            tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
 109            tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_gmtoff);
 110 }
 111 #endif
 112
 113 static void cmos_get_date_time(struct tm *date)
 114 {
 115     int sec, min, hour, mday, mon, year;
 116     time_t ts;
 117     struct tm dummy;
 118
 119     sec = cmos_read(RTC_SECONDS);
 120     min = cmos_read(RTC_MINUTES);
 121     hour = cmos_read(RTC_HOURS);
 122     mday = cmos_read(RTC_DAY_OF_MONTH);
 123     mon = cmos_read(RTC_MONTH);
 124     year = cmos_read(RTC_YEAR);
 125
 126     sec = bcd2dec(sec);
 127     min = bcd2dec(min);
 128     hour = bcd2dec(hour);
 129     mday = bcd2dec(mday);
 130     mon = bcd2dec(mon);
 131     year = bcd2dec(year);
 132
 133     ts = time(NULL);
 134     localtime_r(&ts, &dummy);
 135
 136     date->tm_isdst = dummy.tm_isdst;
 137     date->tm_sec = sec;
 138     date->tm_min = min;
 139     date->tm_hour = hour;
 140     date->tm_mday = mday;
 141     date->tm_mon = mon - 1;
 142     date->tm_year = base_year + year - 1900;
 143 #ifndef __sun__
 144     date->tm_gmtoff = 0;
 145 #endif
 146
 147     ts = mktime(date);
 148 }
 149
 150 static void check_time(int wiggle)
 151 {
 152     struct tm start, date[4], end;
 153     struct tm *datep;
 154     time_t ts;
 155
 156     /*
 157      * This check assumes a few things.  First, we cannot guarantee that we get
 158      * a consistent reading from the wall clock because we may hit an edge of
 159      * the clock while reading.  To work around this, we read four clock readings
 160      * such that at least two of them should match.  We need to assume that one
 161      * reading is corrupt so we need four readings to ensure that we have at
 162      * least two consecutive identical readings
 163      *
 164      * It's also possible that we'll cross an edge reading the host clock so
 165      * simply check to make sure that the clock reading is within the period of
 166      * when we expect it to be.
 167      */
 168
 169     ts = time(NULL);
 170     gmtime_r(&ts, &start);
 171
 172     cmos_get_date_time(&date[0]);
 173     cmos_get_date_time(&date[1]);
 174     cmos_get_date_time(&date[2]);
 175     cmos_get_date_time(&date[3]);
 176
 177     ts = time(NULL);
 178     gmtime_r(&ts, &end);
 179
 180     if (tm_cmp(&date[0], &date[1]) == 0) {
 181         datep = &date[0];
 182     } else if (tm_cmp(&date[1], &date[2]) == 0) {
 183         datep = &date[1];
 184     } else if (tm_cmp(&date[2], &date[3]) == 0) {
 185         datep = &date[2];
 186     } else {
 187         g_assert_not_reached();
 188     }
 189
 190     if (!(tm_cmp(&start, datep) <= 0 && tm_cmp(datep, &end) <= 0)) {
 191         long t, s;
 192
 193         start.tm_isdst = datep->tm_isdst;
 194
 195         t = (long)mktime(datep);
 196         s = (long)mktime(&start);
 197         if (t < s) {
 198             g_test_message("RTC is %ld second(s) behind wall-clock\n", (s - t));
 199         } else {
 200             g_test_message("RTC is %ld second(s) ahead of wall-clock\n", (t - s));
 201         }
 202
 203         g_assert_cmpint(ABS(t - s), <=, wiggle);
 204     }
 205 }
 206
 207 static int wiggle = 2;
 208
 209 static void bcd_check_time(void)
 210 {
 211     if (strcmp(qtest_get_arch(), "sparc64") == 0) {
 212         base = 0x74;
 213         base_year = 1900;
 214         use_mmio = false;
 215     } else if (strcmp(qtest_get_arch(), "sparc") == 0) {
 216         base = 0x71200000;
 217         base_year = 1968;
 218         use_mmio = true;
 219     } else { /* PPC: need to map macio in PCI */
 220         g_assert_not_reached();
 221     }
 222     check_time(wiggle);
 223 }
 224
 225 /* success if no crash or abort */
 226 static void fuzz_registers(void)
 227 {
 228     unsigned int i;
 229
 230     for (i = 0; i < 1000; i++) {
 231         uint8_t reg, val;
 232
 233         reg = (uint8_t)g_test_rand_int_range(0, 16);
 234         val = (uint8_t)g_test_rand_int_range(0, 256);
 235
 236         if (reg == 7) {
 237             /* watchdog setup register, may trigger system reset, skip */
 238             continue;
 239         }
 240
 241         cmos_write(reg, val);
 242         cmos_read(reg);
 243     }
 244 }
 245
 246 int main(int argc, char **argv)
 247 {
 248     QTestState *s = NULL;
 249     int ret;
 250
 251     g_test_init(&argc, &argv, NULL);
 252
 253     s = qtest_start("-rtc clock=vm");
 254
 255     qtest_add_func("/rtc/bcd/check-time", bcd_check_time);
 256     qtest_add_func("/rtc/fuzz-registers", fuzz_registers);
 257     ret = g_test_run();
 258
 259     if (s) {
 260         qtest_quit(s);
 261     }
 262
 263     return ret;
 264 }