mx27rtc.c
1.43 KB
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/*
* Freescale i.MX27 RTC Driver
*
* Copyright (C) 2012 Philippe Reynes <tremyfr@yahoo.fr>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <rtc.h>
#include <asm/io.h>
#include <asm/arch/imx-regs.h>
#define HOUR_SHIFT 8
#define HOUR_MASK 0x1f
#define MIN_SHIFT 0
#define MIN_MASK 0x3f
int rtc_get(struct rtc_time *time)
{
struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
uint32_t day, hour, min, sec;
day = readl(&rtc_regs->dayr);
hour = readl(&rtc_regs->hourmin);
sec = readl(&rtc_regs->seconds);
min = (hour >> MIN_SHIFT) & MIN_MASK;
hour = (hour >> HOUR_SHIFT) & HOUR_MASK;
sec += min * 60 + hour * 3600 + day * 24 * 3600;
to_tm(sec, time);
return 0;
}
int rtc_set(struct rtc_time *time)
{
struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
uint32_t day, hour, min, sec;
sec = mktime(time->tm_year, time->tm_mon, time->tm_mday,
time->tm_hour, time->tm_min, time->tm_sec);
day = sec / (24 * 3600);
sec = sec % (24 * 3600);
hour = sec / 3600;
sec = sec % 3600;
min = sec / 60;
sec = sec % 60;
hour = (hour & HOUR_MASK) << HOUR_SHIFT;
hour |= (min & MIN_MASK) << MIN_SHIFT;
writel(day, &rtc_regs->dayr);
writel(hour, &rtc_regs->hourmin);
writel(sec, &rtc_regs->seconds);
return 0;
}
void rtc_reset(void)
{
struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
writel(0, &rtc_regs->dayr);
writel(0, &rtc_regs->hourmin);
writel(0, &rtc_regs->seconds);
}