post/drivers/rtc.c

   1 /*
   2  * (C) Copyright 2002
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25
  26 /*
  27  * RTC test
  28  *
  29  * The Real Time Clock (RTC) operation is verified by this test.
  30  * The following features are verified:
  31  *   o) Time uniformity
  32  *      This is verified by reading RTC in polling within
  33  *      a short period of time.
  34  *   o) Passing month boundaries
  35  *      This is checked by setting RTC to a second before
  36  *      a month boundary and reading it after its passing the
  37  *      boundary. The test is performed for both leap- and
  38  *      nonleap-years.
  39  */
  40
  41 #include <post.h>
  42 #include <rtc.h>
  43
  44 #if CONFIG_POST & CFG_POST_RTC
  45
  46 static int rtc_post_skip (ulong * diff)
  47 {
  48         struct rtc_time tm1;
  49         struct rtc_time tm2;
  50         ulong start1;
  51         ulong start2;
  52
  53         rtc_get (&tm1);
  54         start1 = get_timer (0);
  55
  56         while (1) {
  57                 rtc_get (&tm2);
  58                 start2 = get_timer (0);
  59                 if (tm1.tm_sec != tm2.tm_sec)
  60                         break;
  61                 if (start2 - start1 > 1500)
  62                         break;
  63         }
  64
  65         if (tm1.tm_sec != tm2.tm_sec) {
  66                 *diff = start2 - start1;
  67
  68                 return 0;
  69         } else {
  70                 return -1;
  71         }
  72 }
  73
  74 static void rtc_post_restore (struct rtc_time *tm, unsigned int sec)
  75 {
  76         time_t t = mktime (tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour,
  77                                            tm->tm_min, tm->tm_sec) + sec;
  78         struct rtc_time ntm;
  79
  80         to_tm (t, &ntm);
  81
  82         rtc_set (&ntm);
  83 }
  84
  85 int rtc_post_test (int flags)
  86 {
  87         ulong diff;
  88         unsigned int i;
  89         struct rtc_time svtm;
  90         static unsigned int daysnl[] =
  91                         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
  92         static unsigned int daysl[] =
  93                         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
  94         unsigned int ynl = 1999;
  95         unsigned int yl = 2000;
  96         unsigned int skipped = 0;
  97
  98         /* Time uniformity */
  99         if (rtc_post_skip (&diff) != 0) {
 100                 post_log ("Timeout while waiting for a new second !\n");
 101
 102                 return -1;
 103         }
 104
 105         for (i = 0; i < 5; i++) {
 106                 if (rtc_post_skip (&diff) != 0) {
 107                         post_log ("Timeout while waiting for a new second !\n");
 108
 109                         return -1;
 110                 }
 111
 112                 if (diff < 950 || diff > 1050) {
 113                         post_log ("Invalid second duration !\n");
 114
 115                         return -1;
 116                 }
 117         }
 118
 119         /* Passing month boundaries */
 120
 121         if (rtc_post_skip (&diff) != 0) {
 122                 post_log ("Timeout while waiting for a new second !\n");
 123
 124                 return -1;
 125         }
 126         rtc_get (&svtm);
 127
 128         for (i = 0; i < 12; i++) {
 129                 time_t t = mktime (ynl, i + 1, daysnl[i], 23, 59, 59);
 130                 struct rtc_time tm;
 131
 132                 to_tm (t, &tm);
 133                 rtc_set (&tm);
 134
 135                 skipped++;
 136                 if (rtc_post_skip (&diff) != 0) {
 137                         rtc_post_restore (&svtm, skipped);
 138                         post_log ("Timeout while waiting for a new second !\n");
 139
 140                         return -1;
 141                 }
 142
 143                 rtc_get (&tm);
 144                 if (tm.tm_mon == i + 1) {
 145                         rtc_post_restore (&svtm, skipped);
 146                         post_log ("Month %d boundary is not passed !\n", i + 1);
 147
 148                         return -1;
 149                 }
 150         }
 151
 152         for (i = 0; i < 12; i++) {
 153                 time_t t = mktime (yl, i + 1, daysl[i], 23, 59, 59);
 154                 struct rtc_time tm;
 155
 156                 to_tm (t, &tm);
 157                 rtc_set (&tm);
 158
 159                 skipped++;
 160                 if (rtc_post_skip (&diff) != 0) {
 161                         rtc_post_restore (&svtm, skipped);
 162                         post_log ("Timeout while waiting for a new second !\n");
 163
 164                         return -1;
 165                 }
 166
 167                 rtc_get (&tm);
 168                 if (tm.tm_mon == i + 1) {
 169                         rtc_post_restore (&svtm, skipped);
 170                         post_log ("Month %d boundary is not passed !\n", i + 1);
 171
 172                         return -1;
 173                 }
 174         }
 175         rtc_post_restore (&svtm, skipped);
 176
 177         return 0;
 178 }
 179
 180 #endif /* CONFIG_POST & CFG_POST_RTC */