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9f9276c34c
Rename this function so that it is clear that it is provided by the RTC. Also return an error when it cannot function as expected. This is unlikely to occur since it works for dates since 1752 and many RTCs do not support such old dates. Still it is better to be accurate. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Heiko Schocher <hs@denx.de>
74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
/*
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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 = mktime(time->tm_year, time->tm_mon, time->tm_mday,
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time->tm_hour, time->tm_min, time->tm_sec);
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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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