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 #ifdef CONFIG_POST
  42
  43 #include <post.h>
  44 #include <rtc.h>
  45
  46 #if CONFIG_POST & CFG_POST_RTC
  47
  48 static int rtc_post_skip (ulong * diff)
  49 {
  50         struct rtc_time tm1;
  51         struct rtc_time tm2;
  52         ulong start1;
  53         ulong start2;
  54
  55         rtc_get (&tm1);
  56         start1 = get_timer (0);
  57
  58         while (1) {
  59                 rtc_get (&tm2);
  60                 start2 = get_timer (0);
  61                 if (tm1.tm_sec != tm2.tm_sec)
  62                         break;
  63                 if (start2 - start1 > 1500)
  64                         break;
  65         }
  66
  67         if (tm1.tm_sec != tm2.tm_sec) {
  68                 *diff = start2 - start1;
  69
  70                 return 0;
  71         } else {
  72                 return -1;
  73         }
  74 }
  75
  76 static void rtc_post_restore (struct rtc_time *tm, unsigned int sec)
  77 {
  78         time_t t = mktime (tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour,
  79                                            tm->tm_min, tm->tm_sec) + sec;
  80         struct rtc_time ntm;
  81
  82         to_tm (t, &ntm);
  83
  84         rtc_set (&ntm);
  85 }
  86
  87 int rtc_post_test (int flags)
  88 {
  89         ulong diff;
  90         unsigned int i;
  91         struct rtc_time svtm;
  92         static unsigned int daysnl[] =
  93                         { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
  94         static unsigned int daysl[] =
  95                         { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
  96         unsigned int ynl = 1999;
  97         unsigned int yl = 2000;
  98         unsigned int skipped = 0;
  99
 100         /* Time uniformity */
 101         if (rtc_post_skip (&diff) != 0) {
 102                 post_log ("Timeout while waiting for a new second !\n");
 103
 104                 return -1;
 105         }
 106
 107         for (i = 0; i < 5; i++) {
 108                 if (rtc_post_skip (&diff) != 0) {
 109                         post_log ("Timeout while waiting for a new second !\n");
 110
 111                         return -1;
 112                 }
 113
 114                 if (diff < 950 || diff > 1050) {
 115                         post_log ("Invalid second duration !\n");
 116
 117                         return -1;
 118                 }
 119         }
 120
 121         /* Passing month boundaries */
 122
 123         if (rtc_post_skip (&diff) != 0) {
 124                 post_log ("Timeout while waiting for a new second !\n");
 125
 126                 return -1;
 127         }
 128         rtc_get (&svtm);
 129
 130         for (i = 0; i < 12; i++) {
 131                 time_t t = mktime (ynl, i + 1, daysnl[i], 23, 59, 59);
 132                 struct rtc_time tm;
 133
 134                 to_tm (t, &tm);
 135                 rtc_set (&tm);
 136
 137                 skipped++;
 138                 if (rtc_post_skip (&diff) != 0) {
 139                         rtc_post_restore (&svtm, skipped);
 140                         post_log ("Timeout while waiting for a new second !\n");
 141
 142                         return -1;
 143                 }
 144
 145                 rtc_get (&tm);
 146                 if (tm.tm_mon == i + 1) {
 147                         rtc_post_restore (&svtm, skipped);
 148                         post_log ("Month %d boundary is not passed !\n", i + 1);
 149
 150                         return -1;
 151                 }
 152         }
 153
 154         for (i = 0; i < 12; i++) {
 155                 time_t t = mktime (yl, i + 1, daysl[i], 23, 59, 59);
 156                 struct rtc_time tm;
 157
 158                 to_tm (t, &tm);
 159                 rtc_set (&tm);
 160
 161                 skipped++;
 162                 if (rtc_post_skip (&diff) != 0) {
 163                         rtc_post_restore (&svtm, skipped);
 164                         post_log ("Timeout while waiting for a new second !\n");
 165
 166                         return -1;
 167                 }
 168
 169                 rtc_get (&tm);
 170                 if (tm.tm_mon == i + 1) {
 171                         rtc_post_restore (&svtm, skipped);
 172                         post_log ("Month %d boundary is not passed !\n", i + 1);
 173
 174                         return -1;
 175                 }
 176         }
 177         rtc_post_restore (&svtm, skipped);
 178
 179         return 0;
 180 }
 181
 182 #endif /* CONFIG_POST & CFG_POST_RTC */
 183 #endif /* CONFIG_POST */