drivers/rtc/mx27rtc.c

   1 /*
   2  * Freescale i.MX27 RTC Driver
   3  *
   4  * Copyright (C) 2012 Philippe Reynes <tremyfr@yahoo.fr>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <rtc.h>
  11 #include <asm/io.h>
  12 #include <asm/arch/imx-regs.h>
  13
  14 #define HOUR_SHIFT 8
  15 #define HOUR_MASK  0x1f
  16 #define MIN_SHIFT  0
  17 #define MIN_MASK   0x3f
  18
  19 int rtc_get(struct rtc_time *time)
  20 {
  21         struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
  22         uint32_t day, hour, min, sec;
  23
  24         day  = readl(&rtc_regs->dayr);
  25         hour = readl(&rtc_regs->hourmin);
  26         sec  = readl(&rtc_regs->seconds);
  27
  28         min  = (hour >> MIN_SHIFT) & MIN_MASK;
  29         hour = (hour >> HOUR_SHIFT) & HOUR_MASK;
  30
  31         sec += min * 60 + hour * 3600 + day * 24 * 3600;
  32
  33         rtc_to_tm(sec, time);
  34
  35         return 0;
  36 }
  37
  38 int rtc_set(struct rtc_time *time)
  39 {
  40         struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
  41         uint32_t day, hour, min, sec;
  42
  43         sec = mktime(time->tm_year, time->tm_mon, time->tm_mday,
  44                 time->tm_hour, time->tm_min, time->tm_sec);
  45
  46         day  = sec / (24 * 3600);
  47         sec  = sec % (24 * 3600);
  48         hour = sec / 3600;
  49         sec  = sec % 3600;
  50         min  = sec / 60;
  51         sec  = sec % 60;
  52
  53         hour  = (hour & HOUR_MASK) << HOUR_SHIFT;
  54         hour |= (min & MIN_MASK) << MIN_SHIFT;
  55
  56         writel(day, &rtc_regs->dayr);
  57         writel(hour, &rtc_regs->hourmin);
  58         writel(sec, &rtc_regs->seconds);
  59
  60         return 0;
  61 }
  62
  63 void rtc_reset(void)
  64 {
  65         struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
  66
  67         writel(0, &rtc_regs->dayr);
  68         writel(0, &rtc_regs->hourmin);
  69         writel(0, &rtc_regs->seconds);
  70 }