73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
/*
|
|
* Freescale i.MX28 RTC Driver
|
|
*
|
|
* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
|
|
* on behalf of DENX Software Engineering GmbH
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <rtc.h>
|
|
#include <asm/io.h>
|
|
#include <asm/arch/imx-regs.h>
|
|
#include <asm/arch/sys_proto.h>
|
|
|
|
#define MXS_RTC_MAX_TIMEOUT 1000000
|
|
|
|
/* Set time in seconds since 1970-01-01 */
|
|
int mxs_rtc_set_time(uint32_t secs)
|
|
{
|
|
struct mxs_rtc_regs *rtc_regs = (struct mxs_rtc_regs *)MXS_RTC_BASE;
|
|
int ret;
|
|
|
|
writel(secs, &rtc_regs->hw_rtc_seconds);
|
|
|
|
/*
|
|
* The 0x80 here means seconds were copied to analog. This information
|
|
* is taken from the linux kernel driver for the STMP37xx RTC since
|
|
* documentation doesn't mention it.
|
|
*/
|
|
ret = mxs_wait_mask_clr(&rtc_regs->hw_rtc_stat_reg,
|
|
0x80 << RTC_STAT_STALE_REGS_OFFSET, MXS_RTC_MAX_TIMEOUT);
|
|
|
|
if (ret)
|
|
printf("MXS RTC: Timeout waiting for update\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
int rtc_get(struct rtc_time *time)
|
|
{
|
|
struct mxs_rtc_regs *rtc_regs = (struct mxs_rtc_regs *)MXS_RTC_BASE;
|
|
uint32_t secs;
|
|
|
|
secs = readl(&rtc_regs->hw_rtc_seconds);
|
|
rtc_to_tm(secs, time);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int rtc_set(struct rtc_time *time)
|
|
{
|
|
uint32_t secs;
|
|
|
|
secs = rtc_mktime(time);
|
|
|
|
return mxs_rtc_set_time(secs);
|
|
}
|
|
|
|
void rtc_reset(void)
|
|
{
|
|
struct mxs_rtc_regs *rtc_regs = (struct mxs_rtc_regs *)MXS_RTC_BASE;
|
|
int ret;
|
|
|
|
/* Set time to 1970-01-01 */
|
|
mxs_rtc_set_time(0);
|
|
|
|
/* Reset the RTC block */
|
|
ret = mxs_reset_block(&rtc_regs->hw_rtc_ctrl_reg);
|
|
if (ret)
|
|
printf("MXS RTC: Block reset timeout\n");
|
|
}
|