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