firmware/drivers/rtc/rtc_rx5x348ab.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2007 by Jonathan Gordon
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include "config.h"
  23 #include "spi.h"
  24 #include "rtc.h"
  25
  26 /* Choose one of: */
  27 #define ADDR_READ       0x04
  28 #define ADDR_WRITE      0x00
  29 /* and one of: */
  30 #define ADDR_ONE        0x08
  31 #define ADDR_BURST      0x00
  32
  33 void rtc_init(void)
  34 {
  35 }
  36
  37 int rtc_read_datetime(struct tm *tm)
  38 {
  39     unsigned int i;
  40     unsigned char buf[7];
  41     char command = ADDR_READ|ADDR_BURST; /* burst read from the start of the time/date reg */
  42
  43     spi_block_transfer(SPI_target_RX5X348AB, &command, 1, buf, sizeof(buf));
  44
  45     for (i = 0; i < sizeof(buf); i++)
  46         buf[i] = BCD2DEC(buf[i]);
  47
  48     tm->tm_sec = buf[0];
  49     tm->tm_min = buf[1];
  50     tm->tm_hour = buf[2];
  51     tm->tm_wday = buf[3];
  52     tm->tm_mday = buf[4];
  53     tm->tm_mon = buf[5] - 1;
  54     tm->tm_year = buf[6] + 100;
  55
  56     return 1;
  57 }
  58
  59 int rtc_write_datetime(const struct tm *tm)
  60 {
  61     unsigned int i;
  62     char command = ADDR_WRITE|ADDR_BURST; /* burst read from the start of the time/date reg */
  63     unsigned char buf[8];
  64
  65     buf[0] = command;
  66     buf[1] = tm->tm_sec;
  67     buf[2] = tm->tm_min;
  68     buf[3] = tm->tm_hour;
  69     buf[4] = tm->tm_wday;
  70     buf[5] = tm->tm_mday;
  71     buf[6] = tm->tm_mon + 1;
  72     buf[7] = tm->tm_year - 100;
  73
  74     /* don't encode the comand byte */
  75     for (i = 1; i < sizeof(buf); i++)
  76         buf[i] = DEC2BCD(buf[i]);
  77
  78     spi_block_transfer(SPI_target_RX5X348AB, buf, sizeof(buf), NULL, 0);
  79     return 1;
  80 }
  81