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     uint8_t data;
  39
  40     memread(base + (uint32_t)reg_base + (uint32_t)reg, &data, 1);
  41     return data;
  42 }
  43
  44 static void cmos_write_mmio(uint8_t reg, uint8_t val)
  45 {
  46     uint8_t data = val;
  47
  48     memwrite(base + (uint32_t)reg_base + (uint32_t)reg, &data, 1);
  49 }
  50
  51 static uint8_t cmos_read_ioio(uint8_t reg)
  52 {
  53     outw(base + 0, reg_base + (uint16_t)reg);
  54     return inb(base + 3);
  55 }
  56
  57 static void cmos_write_ioio(uint8_t reg, uint8_t val)
  58 {
  59     outw(base + 0, reg_base + (uint16_t)reg);
  60     outb(base + 3, val);
  61 }
  62
  63 static uint8_t cmos_read(uint8_t reg)
  64 {
  65     if (use_mmio) {
  66         return cmos_read_mmio(reg);
  67     } else {
  68         return cmos_read_ioio(reg);
  69     }
  70 }
  71
  72 static void cmos_write(uint8_t reg, uint8_t val)
  73 {
  74     if (use_mmio) {
  75         cmos_write_mmio(reg, val);
  76     } else {
  77         cmos_write_ioio(reg, val);
  78     }
  79 }
  80
  81 static int bcd2dec(int value)
  82 {
  83     return (((value >> 4) & 0x0F) * 10) + (value & 0x0F);
  84 }
  85
  86 static int tm_cmp(struct tm *lhs, struct tm *rhs)
  87 {
  88     time_t a, b;
  89     struct tm d1, d2;
  90
  91     memcpy(&d1, lhs, sizeof(d1));
  92     memcpy(&d2, rhs, sizeof(d2));
  93
  94     a = mktime(&d1);
  95     b = mktime(&d2);
  96
  97     if (a < b) {
  98         return -1;
  99     } else if (a > b) {
 100         return 1;
 101     }
 102
 103     return 0;
 104 }
 105
 106 #if 0
 107 static void print_tm(struct tm *tm)
 108 {
 109     printf("%04d-%02d-%02d %02d:%02d:%02d %+02ld\n",
 110            tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
 111            tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_gmtoff);
 112 }
 113 #endif
 114
 115 static void cmos_get_date_time(struct tm *date)
 116 {
 117     int sec, min, hour, mday, mon, year;
 118     time_t ts;
 119     struct tm dummy;
 120
 121     sec = cmos_read(RTC_SECONDS);
 122     min = cmos_read(RTC_MINUTES);
 123     hour = cmos_read(RTC_HOURS);
 124     mday = cmos_read(RTC_DAY_OF_MONTH);
 125     mon = cmos_read(RTC_MONTH);
 126     year = cmos_read(RTC_YEAR);
 127
 128     sec = bcd2dec(sec);
 129     min = bcd2dec(min);
 130     hour = bcd2dec(hour);
 131     mday = bcd2dec(mday);
 132     mon = bcd2dec(mon);
 133     year = bcd2dec(year);
 134
 135     ts = time(NULL);
 136     localtime_r(&ts, &dummy);
 137
 138     date->tm_isdst = dummy.tm_isdst;
 139     date->tm_sec = sec;
 140     date->tm_min = min;
 141     date->tm_hour = hour;
 142     date->tm_mday = mday;
 143     date->tm_mon = mon - 1;
 144     date->tm_year = base_year + year - 1900;
 145     date->tm_gmtoff = 0;
 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         cmos_write(reg, val);
 237         cmos_read(reg);
 238     }
 239 }
 240
 241 int main(int argc, char **argv)
 242 {
 243     QTestState *s = NULL;
 244     int ret;
 245
 246     g_test_init(&argc, &argv, NULL);
 247
 248     s = qtest_start("-display none -rtc clock=vm");
 249
 250     qtest_add_func("/rtc/bcd/check-time", bcd_check_time);
 251     qtest_add_func("/rtc/fuzz-registers", fuzz_registers);
 252     ret = g_test_run();
 253
 254     if (s) {
 255         qtest_quit(s);
 256     }
 257
 258     return ret;
 259 }