drivers/rtc/mc13xxx-rtc.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2008, Guennadi Liakhovetski <[email protected]>
   4  */
   5
   6 #include <rtc.h>
   7 #include <spi.h>
   8 #include <power/pmic.h>
   9 #include <fsl_pmic.h>
  10
  11 int rtc_get(struct rtc_time *rtc)
  12 {
  13         u32 day1, day2, time;
  14         int tim, i = 0;
  15         struct pmic *p = pmic_get("FSL_PMIC");
  16         int ret;
  17
  18         if (!p)
  19                 return -1;
  20         do {
  21                 ret = pmic_reg_read(p, REG_RTC_DAY, &day1);
  22                 if (ret < 0)
  23                         return -1;
  24
  25                 ret = pmic_reg_read(p, REG_RTC_TIME, &time);
  26                 if (ret < 0)
  27                         return -1;
  28
  29                 ret = pmic_reg_read(p, REG_RTC_DAY, &day2);
  30                 if (ret < 0)
  31                         return -1;
  32
  33         } while (day1 != day2 && i++ < 3);
  34
  35         tim = day1 * 86400 + time;
  36
  37         rtc_to_tm(tim, rtc);
  38
  39         rtc->tm_yday = 0;
  40         rtc->tm_isdst = 0;
  41
  42         return 0;
  43 }
  44
  45 int rtc_set(struct rtc_time *rtc)
  46 {
  47         u32 time, day;
  48         struct pmic *p = pmic_get("FSL_PMIC");
  49         if (!p)
  50                 return -1;
  51
  52         time = rtc_mktime(rtc);
  53         day = time / 86400;
  54         time %= 86400;
  55
  56         pmic_reg_write(p, REG_RTC_DAY, day);
  57         pmic_reg_write(p, REG_RTC_TIME, time);
  58
  59         return 0;
  60 }
  61
  62 void rtc_reset(void)
  63 {
  64 }