LXR uboot/drivers/rtc/pcf8563.c

   1/*
   2 * (C) Copyright 2001
   3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4 *
   5 * SPDX-License-Identifier:     GPL-2.0+
   6 */
   7
   8/*
   9 * Date & Time support for Philips PCF8563 RTC
  10 */
  11
  12/* #define      DEBUG   */
  13
  14#include <common.h>
  15#include <command.h>
  16#include <rtc.h>
  17#include <i2c.h>
  18
  19#if defined(CONFIG_CMD_DATE)
  20
  21static uchar rtc_read  (uchar reg);
  22static void  rtc_write (uchar reg, uchar val);
  23
  24/* ------------------------------------------------------------------------- */
  25
  26int rtc_get (struct rtc_time *tmp)
  27{
  28        int rel = 0;
  29        uchar sec, min, hour, mday, wday, mon_cent, year;
  30
  31        sec     = rtc_read (0x02);
  32        min     = rtc_read (0x03);
  33        hour    = rtc_read (0x04);
  34        mday    = rtc_read (0x05);
  35        wday    = rtc_read (0x06);
  36        mon_cent= rtc_read (0x07);
  37        year    = rtc_read (0x08);
  38
  39        debug ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
  40                "hr: %02x min: %02x sec: %02x\n",
  41                year, mon_cent, mday, wday,
  42                hour, min, sec );
  43        debug ( "Alarms: wday: %02x day: %02x hour: %02x min: %02x\n",
  44                rtc_read (0x0C),
  45                rtc_read (0x0B),
  46                rtc_read (0x0A),
  47                rtc_read (0x09) );
  48
  49        if (sec & 0x80) {
  50                puts ("### Warning: RTC Low Voltage - date/time not reliable\n");
  51                rel = -1;
  52        }
  53
  54        tmp->tm_sec  = bcd2bin (sec  & 0x7F);
  55        tmp->tm_min  = bcd2bin (min  & 0x7F);
  56        tmp->tm_hour = bcd2bin (hour & 0x3F);
  57        tmp->tm_mday = bcd2bin (mday & 0x3F);
  58        tmp->tm_mon  = bcd2bin (mon_cent & 0x1F);
  59        tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 1900 : 2000);
  60        tmp->tm_wday = bcd2bin (wday & 0x07);
  61        tmp->tm_yday = 0;
  62        tmp->tm_isdst= 0;
  63
  64        debug ( "Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
  65                tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
  66                tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
  67
  68        return rel;
  69}
  70
  71int rtc_set (struct rtc_time *tmp)
  72{
  73        uchar century;
  74
  75        debug ( "Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
  76                tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
  77                tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
  78
  79        rtc_write (0x08, bin2bcd(tmp->tm_year % 100));
  80
  81        century = (tmp->tm_year >= 2000) ? 0 : 0x80;
  82        rtc_write (0x07, bin2bcd(tmp->tm_mon) | century);
  83
  84        rtc_write (0x06, bin2bcd(tmp->tm_wday));
  85        rtc_write (0x05, bin2bcd(tmp->tm_mday));
  86        rtc_write (0x04, bin2bcd(tmp->tm_hour));
  87        rtc_write (0x03, bin2bcd(tmp->tm_min ));
  88        rtc_write (0x02, bin2bcd(tmp->tm_sec ));
  89
  90        return 0;
  91}
  92
  93void rtc_reset (void)
  94{
  95        /* clear all control & status registers */
  96        rtc_write (0x00, 0x00);
  97        rtc_write (0x01, 0x00);
  98        rtc_write (0x0D, 0x00);
  99
 100        /* clear Voltage Low bit */
 101        rtc_write (0x02, rtc_read (0x02) & 0x7F);
 102
 103        /* reset all alarms */
 104        rtc_write (0x09, 0x00);
 105        rtc_write (0x0A, 0x00);
 106        rtc_write (0x0B, 0x00);
 107        rtc_write (0x0C, 0x00);
 108}
 109
 110/* ------------------------------------------------------------------------- */
 111
 112static uchar rtc_read (uchar reg)
 113{
 114        return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg));
 115}
 116
 117static void rtc_write (uchar reg, uchar val)
 118{
 119        i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
 120}
 121
 122#endif
 123