/* * Freescale i.MX28 RTC Driver * * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com> * on behalf of DENX Software Engineering GmbH * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #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 mx28_rtc_regs *rtc_regs = (struct mx28_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 = mx28_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 mx28_rtc_regs *rtc_regs = (struct mx28_rtc_regs *)MXS_RTC_BASE; uint32_t secs; secs = readl(&rtc_regs->hw_rtc_seconds); to_tm(secs, time); return 0; } int rtc_set(struct rtc_time *time) { uint32_t secs; secs = mktime(time->tm_year, time->tm_mon, time->tm_mday, time->tm_hour, time->tm_min, time->tm_sec); return mxs_rtc_set_time(secs); } void rtc_reset(void) { struct mx28_rtc_regs *rtc_regs = (struct mx28_rtc_regs *)MXS_RTC_BASE; int ret; /* Set time to 1970-01-01 */ mxs_rtc_set_time(0); /* Reset the RTC block */ ret = mx28_reset_block(&rtc_regs->hw_rtc_ctrl_reg); if (ret) printf("MXS RTC: Block reset timeout\n"); }