87 lines
2.2 KiB
C
87 lines
2.2 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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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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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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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