LXR uboot/drivers/rtc/mx27rtc.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Freescale i.MX27 RTC Driver
   4 *
   5 * Copyright (C) 2012 Philippe Reynes <tremyfr@yahoo.fr>
   6 */
   7
   8#include <common.h>
   9#include <rtc.h>
  10#include <asm/io.h>
  11#include <asm/arch/imx-regs.h>
  12
  13#define HOUR_SHIFT 8
  14#define HOUR_MASK  0x1f
  15#define MIN_SHIFT  0
  16#define MIN_MASK   0x3f
  17
  18int rtc_get(struct rtc_time *time)
  19{
  20        struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
  21        uint32_t day, hour, min, sec;
  22
  23        day  = readl(&rtc_regs->dayr);
  24        hour = readl(&rtc_regs->hourmin);
  25        sec  = readl(&rtc_regs->seconds);
  26
  27        min  = (hour >> MIN_SHIFT) & MIN_MASK;
  28        hour = (hour >> HOUR_SHIFT) & HOUR_MASK;
  29
  30        sec += min * 60 + hour * 3600 + day * 24 * 3600;
  31
  32        rtc_to_tm(sec, time);
  33
  34        return 0;
  35}
  36
  37int rtc_set(struct rtc_time *time)
  38{
  39        struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
  40        uint32_t day, hour, min, sec;
  41
  42        sec = rtc_mktime(time);
  43
  44        day  = sec / (24 * 3600);
  45        sec  = sec % (24 * 3600);
  46        hour = sec / 3600;
  47        sec  = sec % 3600;
  48        min  = sec / 60;
  49        sec  = sec % 60;
  50
  51        hour  = (hour & HOUR_MASK) << HOUR_SHIFT;
  52        hour |= (min & MIN_MASK) << MIN_SHIFT;
  53
  54        writel(day, &rtc_regs->dayr);
  55        writel(hour, &rtc_regs->hourmin);
  56        writel(sec, &rtc_regs->seconds);
  57
  58        return 0;
  59}
  60
  61void rtc_reset(void)
  62{
  63        /* nothing to do */
  64}
  65