1aa711b11SMarek Vasut /* 2aa711b11SMarek Vasut * Freescale i.MX28 RTC Driver 3aa711b11SMarek Vasut * 4aa711b11SMarek Vasut * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com> 5aa711b11SMarek Vasut * on behalf of DENX Software Engineering GmbH 6aa711b11SMarek Vasut * 7aa711b11SMarek Vasut * This program is free software; you can redistribute it and/or modify 8aa711b11SMarek Vasut * it under the terms of the GNU General Public License as published by 9aa711b11SMarek Vasut * the Free Software Foundation; either version 2 of the License, or 10aa711b11SMarek Vasut * (at your option) any later version. 11aa711b11SMarek Vasut * 12aa711b11SMarek Vasut * This program is distributed in the hope that it will be useful, 13aa711b11SMarek Vasut * but WITHOUT ANY WARRANTY; without even the implied warranty of 14aa711b11SMarek Vasut * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15aa711b11SMarek Vasut * GNU General Public License for more details. 16aa711b11SMarek Vasut * 17aa711b11SMarek Vasut * You should have received a copy of the GNU General Public License 18aa711b11SMarek Vasut * along with this program; if not, write to the Free Software 19aa711b11SMarek Vasut * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20aa711b11SMarek Vasut * 21aa711b11SMarek Vasut */ 22aa711b11SMarek Vasut 23aa711b11SMarek Vasut #include <common.h> 24aa711b11SMarek Vasut #include <rtc.h> 25aa711b11SMarek Vasut #include <asm/io.h> 26aa711b11SMarek Vasut #include <asm/arch/imx-regs.h> 27aa711b11SMarek Vasut #include <asm/arch/sys_proto.h> 28aa711b11SMarek Vasut 29aa711b11SMarek Vasut #define MXS_RTC_MAX_TIMEOUT 1000000 30aa711b11SMarek Vasut 31aa711b11SMarek Vasut /* Set time in seconds since 1970-01-01 */ 32aa711b11SMarek Vasut int mxs_rtc_set_time(uint32_t secs) 33aa711b11SMarek Vasut { 349c471142SOtavio Salvador struct mxs_rtc_regs *rtc_regs = (struct mxs_rtc_regs *)MXS_RTC_BASE; 35aa711b11SMarek Vasut int ret; 36aa711b11SMarek Vasut 37aa711b11SMarek Vasut writel(secs, &rtc_regs->hw_rtc_seconds); 38aa711b11SMarek Vasut 39aa711b11SMarek Vasut /* 40aa711b11SMarek Vasut * The 0x80 here means seconds were copied to analog. This information 41aa711b11SMarek Vasut * is taken from the linux kernel driver for the STMP37xx RTC since 42aa711b11SMarek Vasut * documentation doesn't mention it. 43aa711b11SMarek Vasut */ 44*fa7a51cbSOtavio Salvador ret = mxs_wait_mask_clr(&rtc_regs->hw_rtc_stat_reg, 45aa711b11SMarek Vasut 0x80 << RTC_STAT_STALE_REGS_OFFSET, MXS_RTC_MAX_TIMEOUT); 46aa711b11SMarek Vasut 47aa711b11SMarek Vasut if (ret) 48aa711b11SMarek Vasut printf("MXS RTC: Timeout waiting for update\n"); 49aa711b11SMarek Vasut 50aa711b11SMarek Vasut return ret; 51aa711b11SMarek Vasut } 52aa711b11SMarek Vasut 53aa711b11SMarek Vasut int rtc_get(struct rtc_time *time) 54aa711b11SMarek Vasut { 559c471142SOtavio Salvador struct mxs_rtc_regs *rtc_regs = (struct mxs_rtc_regs *)MXS_RTC_BASE; 56aa711b11SMarek Vasut uint32_t secs; 57aa711b11SMarek Vasut 58aa711b11SMarek Vasut secs = readl(&rtc_regs->hw_rtc_seconds); 59aa711b11SMarek Vasut to_tm(secs, time); 60aa711b11SMarek Vasut 61aa711b11SMarek Vasut return 0; 62aa711b11SMarek Vasut } 63aa711b11SMarek Vasut 64aa711b11SMarek Vasut int rtc_set(struct rtc_time *time) 65aa711b11SMarek Vasut { 66aa711b11SMarek Vasut uint32_t secs; 67aa711b11SMarek Vasut 68aa711b11SMarek Vasut secs = mktime(time->tm_year, time->tm_mon, time->tm_mday, 69aa711b11SMarek Vasut time->tm_hour, time->tm_min, time->tm_sec); 70aa711b11SMarek Vasut 71aa711b11SMarek Vasut return mxs_rtc_set_time(secs); 72aa711b11SMarek Vasut } 73aa711b11SMarek Vasut 74aa711b11SMarek Vasut void rtc_reset(void) 75aa711b11SMarek Vasut { 769c471142SOtavio Salvador struct mxs_rtc_regs *rtc_regs = (struct mxs_rtc_regs *)MXS_RTC_BASE; 77aa711b11SMarek Vasut int ret; 78aa711b11SMarek Vasut 79aa711b11SMarek Vasut /* Set time to 1970-01-01 */ 80aa711b11SMarek Vasut mxs_rtc_set_time(0); 81aa711b11SMarek Vasut 82aa711b11SMarek Vasut /* Reset the RTC block */ 83*fa7a51cbSOtavio Salvador ret = mxs_reset_block(&rtc_regs->hw_rtc_ctrl_reg); 84aa711b11SMarek Vasut if (ret) 85aa711b11SMarek Vasut printf("MXS RTC: Block reset timeout\n"); 86aa711b11SMarek Vasut } 87