1*aa711b11SMarek Vasut /* 2*aa711b11SMarek Vasut * Freescale i.MX28 RTC Driver 3*aa711b11SMarek Vasut * 4*aa711b11SMarek Vasut * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com> 5*aa711b11SMarek Vasut * on behalf of DENX Software Engineering GmbH 6*aa711b11SMarek Vasut * 7*aa711b11SMarek Vasut * This program is free software; you can redistribute it and/or modify 8*aa711b11SMarek Vasut * it under the terms of the GNU General Public License as published by 9*aa711b11SMarek Vasut * the Free Software Foundation; either version 2 of the License, or 10*aa711b11SMarek Vasut * (at your option) any later version. 11*aa711b11SMarek Vasut * 12*aa711b11SMarek Vasut * This program is distributed in the hope that it will be useful, 13*aa711b11SMarek Vasut * but WITHOUT ANY WARRANTY; without even the implied warranty of 14*aa711b11SMarek Vasut * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15*aa711b11SMarek Vasut * GNU General Public License for more details. 16*aa711b11SMarek Vasut * 17*aa711b11SMarek Vasut * You should have received a copy of the GNU General Public License 18*aa711b11SMarek Vasut * along with this program; if not, write to the Free Software 19*aa711b11SMarek Vasut * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20*aa711b11SMarek Vasut * 21*aa711b11SMarek Vasut */ 22*aa711b11SMarek Vasut 23*aa711b11SMarek Vasut #include <common.h> 24*aa711b11SMarek Vasut #include <rtc.h> 25*aa711b11SMarek Vasut #include <asm/io.h> 26*aa711b11SMarek Vasut #include <asm/arch/imx-regs.h> 27*aa711b11SMarek Vasut #include <asm/arch/sys_proto.h> 28*aa711b11SMarek Vasut 29*aa711b11SMarek Vasut #define MXS_RTC_MAX_TIMEOUT 1000000 30*aa711b11SMarek Vasut 31*aa711b11SMarek Vasut /* Set time in seconds since 1970-01-01 */ 32*aa711b11SMarek Vasut int mxs_rtc_set_time(uint32_t secs) 33*aa711b11SMarek Vasut { 34*aa711b11SMarek Vasut struct mx28_rtc_regs *rtc_regs = (struct mx28_rtc_regs *)MXS_RTC_BASE; 35*aa711b11SMarek Vasut int ret; 36*aa711b11SMarek Vasut 37*aa711b11SMarek Vasut writel(secs, &rtc_regs->hw_rtc_seconds); 38*aa711b11SMarek Vasut 39*aa711b11SMarek Vasut /* 40*aa711b11SMarek Vasut * The 0x80 here means seconds were copied to analog. This information 41*aa711b11SMarek Vasut * is taken from the linux kernel driver for the STMP37xx RTC since 42*aa711b11SMarek Vasut * documentation doesn't mention it. 43*aa711b11SMarek Vasut */ 44*aa711b11SMarek Vasut ret = mx28_wait_mask_clr(&rtc_regs->hw_rtc_stat_reg, 45*aa711b11SMarek Vasut 0x80 << RTC_STAT_STALE_REGS_OFFSET, MXS_RTC_MAX_TIMEOUT); 46*aa711b11SMarek Vasut 47*aa711b11SMarek Vasut if (ret) 48*aa711b11SMarek Vasut printf("MXS RTC: Timeout waiting for update\n"); 49*aa711b11SMarek Vasut 50*aa711b11SMarek Vasut return ret; 51*aa711b11SMarek Vasut } 52*aa711b11SMarek Vasut 53*aa711b11SMarek Vasut int rtc_get(struct rtc_time *time) 54*aa711b11SMarek Vasut { 55*aa711b11SMarek Vasut struct mx28_rtc_regs *rtc_regs = (struct mx28_rtc_regs *)MXS_RTC_BASE; 56*aa711b11SMarek Vasut uint32_t secs; 57*aa711b11SMarek Vasut 58*aa711b11SMarek Vasut secs = readl(&rtc_regs->hw_rtc_seconds); 59*aa711b11SMarek Vasut to_tm(secs, time); 60*aa711b11SMarek Vasut 61*aa711b11SMarek Vasut return 0; 62*aa711b11SMarek Vasut } 63*aa711b11SMarek Vasut 64*aa711b11SMarek Vasut int rtc_set(struct rtc_time *time) 65*aa711b11SMarek Vasut { 66*aa711b11SMarek Vasut uint32_t secs; 67*aa711b11SMarek Vasut 68*aa711b11SMarek Vasut secs = mktime(time->tm_year, time->tm_mon, time->tm_mday, 69*aa711b11SMarek Vasut time->tm_hour, time->tm_min, time->tm_sec); 70*aa711b11SMarek Vasut 71*aa711b11SMarek Vasut return mxs_rtc_set_time(secs); 72*aa711b11SMarek Vasut } 73*aa711b11SMarek Vasut 74*aa711b11SMarek Vasut void rtc_reset(void) 75*aa711b11SMarek Vasut { 76*aa711b11SMarek Vasut struct mx28_rtc_regs *rtc_regs = (struct mx28_rtc_regs *)MXS_RTC_BASE; 77*aa711b11SMarek Vasut int ret; 78*aa711b11SMarek Vasut 79*aa711b11SMarek Vasut /* Set time to 1970-01-01 */ 80*aa711b11SMarek Vasut mxs_rtc_set_time(0); 81*aa711b11SMarek Vasut 82*aa711b11SMarek Vasut /* Reset the RTC block */ 83*aa711b11SMarek Vasut ret = mx28_reset_block(&rtc_regs->hw_rtc_ctrl_reg); 84*aa711b11SMarek Vasut if (ret) 85*aa711b11SMarek Vasut printf("MXS RTC: Block reset timeout\n"); 86*aa711b11SMarek Vasut } 87