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) RTC Power Fault
  32  *      This is verified by analyzing the rtc_get() return status.
  33  *   o) Time uniformity
  34  *      This is verified by reading RTC in polling within
  35  *      a short period of time.
  36  *   o) Passing month boundaries
  37  *      This is checked by setting RTC to a second before
  38  *      a month boundary and reading it after its passing the
  39  *      boundary. The test is performed for both leap- and
  40  *      nonleap-years.
  41  */
  42
  43 #include <post.h>
  44 #include <rtc.h>
  45
  46 #if CONFIG_POST & CONFIG_SYS_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         int reliable;
 100
 101         /* Time reliability */
 102         reliable = rtc_get (&svtm);
 103
 104         /* Time uniformity */
 105         if (rtc_post_skip (&diff) != 0) {
 106                 post_log ("Timeout while waiting for a new second !\n");
 107
 108                 return -1;
 109         }
 110
 111         for (i = 0; i < 5; i++) {
 112                 if (rtc_post_skip (&diff) != 0) {
 113                         post_log ("Timeout while waiting for a new second !\n");
 114
 115                         return -1;
 116                 }
 117
 118                 if (diff < 950 || diff > 1050) {
 119                         post_log ("Invalid second duration !\n");
 120
 121                         return -1;
 122                 }
 123         }
 124
 125         /* Passing month boundaries */
 126
 127         if (rtc_post_skip (&diff) != 0) {
 128                 post_log ("Timeout while waiting for a new second !\n");
 129
 130                 return -1;
 131         }
 132         rtc_get (&svtm);
 133
 134         for (i = 0; i < 12; i++) {
 135                 time_t t = mktime (ynl, i + 1, daysnl[i], 23, 59, 59);
 136                 struct rtc_time tm;
 137
 138                 to_tm (t, &tm);
 139                 rtc_set (&tm);
 140
 141                 skipped++;
 142                 if (rtc_post_skip (&diff) != 0) {
 143                         rtc_post_restore (&svtm, skipped);
 144                         post_log ("Timeout while waiting for a new second !\n");
 145
 146                         return -1;
 147                 }
 148
 149                 rtc_get (&tm);
 150                 if (tm.tm_mon == i + 1) {
 151                         rtc_post_restore (&svtm, skipped);
 152                         post_log ("Month %d boundary is not passed !\n", i + 1);
 153
 154                         return -1;
 155                 }
 156         }
 157
 158         for (i = 0; i < 12; i++) {
 159                 time_t t = mktime (yl, i + 1, daysl[i], 23, 59, 59);
 160                 struct rtc_time tm;
 161
 162                 to_tm (t, &tm);
 163                 rtc_set (&tm);
 164
 165                 skipped++;
 166                 if (rtc_post_skip (&diff) != 0) {
 167                         rtc_post_restore (&svtm, skipped);
 168                         post_log ("Timeout while waiting for a new second !\n");
 169
 170                         return -1;
 171                 }
 172
 173                 rtc_get (&tm);
 174                 if (tm.tm_mon == i + 1) {
 175                         rtc_post_restore (&svtm, skipped);
 176                         post_log ("Month %d boundary is not passed !\n", i + 1);
 177
 178                         return -1;
 179                 }
 180         }
 181         rtc_post_restore (&svtm, skipped);
 182
 183         /* If come here, then RTC operates correcty, check the correctness
 184          * of the time it reports.
 185          */
 186         if (reliable < 0) {
 187                 post_log ("RTC Time is not reliable! Power fault? \n");
 188
 189                 return -1;
 190         }
 191
 192         return 0;
 193 }
 194
 195 #endif /* CONFIG_POST & CONFIG_SYS_POST_RTC */