drivers/rtc/davinci.c

   1 /*
   2  * (C) Copyright 2011 DENX Software Engineering GmbH
   3  * Heiko Schocher <hs@denx.de>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7 #include <common.h>
   8 #include <command.h>
   9 #include <rtc.h>
  10 #include <asm/io.h>
  11 #include <asm/arch/hardware.h>
  12
  13 #if defined(CONFIG_CMD_DATE)
  14 int rtc_get(struct rtc_time *tmp)
  15 {
  16         struct davinci_rtc *rtc = davinci_rtc_base;
  17         unsigned long sec, min, hour, mday, wday, mon_cent, year;
  18         unsigned long status;
  19
  20         status = readl(&rtc->status);
  21         if ((status & RTC_STATE_RUN) != RTC_STATE_RUN) {
  22                 printf("RTC doesn't run\n");
  23                 return -1;
  24         }
  25         if ((status & RTC_STATE_BUSY) == RTC_STATE_BUSY)
  26                 udelay(20);
  27
  28         sec     = readl(&rtc->second);
  29         min     = readl(&rtc->minutes);
  30         hour    = readl(&rtc->hours);
  31         mday    = readl(&rtc->day);
  32         wday    = readl(&rtc->dotw);
  33         mon_cent = readl(&rtc->month);
  34         year    = readl(&rtc->year);
  35
  36         debug("Get RTC year: %02lx mon/cent: %02lx mday: %02lx wday: %02lx "
  37                 "hr: %02lx min: %02lx sec: %02lx\n",
  38                 year, mon_cent, mday, wday,
  39                 hour, min, sec);
  40
  41         tmp->tm_sec  = bcd2bin(sec  & 0x7F);
  42         tmp->tm_min  = bcd2bin(min  & 0x7F);
  43         tmp->tm_hour = bcd2bin(hour & 0x3F);
  44         tmp->tm_mday = bcd2bin(mday & 0x3F);
  45         tmp->tm_mon  = bcd2bin(mon_cent & 0x1F);
  46         tmp->tm_year = bcd2bin(year) + 2000;
  47         tmp->tm_wday = bcd2bin(wday & 0x07);
  48         tmp->tm_yday = 0;
  49         tmp->tm_isdst = 0;
  50
  51         debug("Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
  52                 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
  53                 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
  54
  55         return 0;
  56 }
  57
  58 int rtc_set(struct rtc_time *tmp)
  59 {
  60         struct davinci_rtc *rtc = davinci_rtc_base;
  61
  62         debug("Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
  63                 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
  64                 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
  65         writel(bin2bcd(tmp->tm_year % 100), &rtc->year);
  66         writel(bin2bcd(tmp->tm_mon), &rtc->month);
  67
  68         writel(bin2bcd(tmp->tm_wday), &rtc->dotw);
  69         writel(bin2bcd(tmp->tm_mday), &rtc->day);
  70         writel(bin2bcd(tmp->tm_hour), &rtc->hours);
  71         writel(bin2bcd(tmp->tm_min), &rtc->minutes);
  72         writel(bin2bcd(tmp->tm_sec), &rtc->second);
  73         return 0;
  74 }
  75
  76 void rtc_reset(void)
  77 {
  78         struct davinci_rtc *rtc = davinci_rtc_base;
  79
  80         /* run RTC counter */
  81         writel(0x01, &rtc->ctrl);
  82 }
  83 #endif