1*78befb69Strem /* 2*78befb69Strem * Freescale i.MX27 RTC Driver 3*78befb69Strem * 4*78befb69Strem * Copyright (C) 2012 Philippe Reynes <tremyfr@yahoo.fr> 5*78befb69Strem * 6*78befb69Strem * This program is free software; you can redistribute it and/or modify 7*78befb69Strem * it under the terms of the GNU General Public License as published by 8*78befb69Strem * the Free Software Foundation; either version 2 of the License, or 9*78befb69Strem * (at your option) any later version. 10*78befb69Strem * 11*78befb69Strem * This program is distributed in the hope that it will be useful, 12*78befb69Strem * but WITHOUT ANY WARRANTY; without even the implied warranty of 13*78befb69Strem * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14*78befb69Strem * GNU General Public License for more details. 15*78befb69Strem * 16*78befb69Strem * You should have received a copy of the GNU General Public License 17*78befb69Strem * along with this program; if not, write to the Free Software 18*78befb69Strem * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19*78befb69Strem * 20*78befb69Strem */ 21*78befb69Strem 22*78befb69Strem #include <common.h> 23*78befb69Strem #include <rtc.h> 24*78befb69Strem #include <asm/io.h> 25*78befb69Strem #include <asm/arch/imx-regs.h> 26*78befb69Strem 27*78befb69Strem #define HOUR_SHIFT 8 28*78befb69Strem #define HOUR_MASK 0x1f 29*78befb69Strem #define MIN_SHIFT 0 30*78befb69Strem #define MIN_MASK 0x3f 31*78befb69Strem 32*78befb69Strem int rtc_get(struct rtc_time *time) 33*78befb69Strem { 34*78befb69Strem struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE; 35*78befb69Strem uint32_t day, hour, min, sec; 36*78befb69Strem 37*78befb69Strem day = readl(&rtc_regs->dayr); 38*78befb69Strem hour = readl(&rtc_regs->hourmin); 39*78befb69Strem sec = readl(&rtc_regs->seconds); 40*78befb69Strem 41*78befb69Strem min = (hour >> MIN_SHIFT) & MIN_MASK; 42*78befb69Strem hour = (hour >> HOUR_SHIFT) & HOUR_MASK; 43*78befb69Strem 44*78befb69Strem sec += min * 60 + hour * 3600 + day * 24 * 3600; 45*78befb69Strem 46*78befb69Strem to_tm(sec, time); 47*78befb69Strem 48*78befb69Strem return 0; 49*78befb69Strem } 50*78befb69Strem 51*78befb69Strem int rtc_set(struct rtc_time *time) 52*78befb69Strem { 53*78befb69Strem struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE; 54*78befb69Strem uint32_t day, hour, min, sec; 55*78befb69Strem 56*78befb69Strem sec = mktime(time->tm_year, time->tm_mon, time->tm_mday, 57*78befb69Strem time->tm_hour, time->tm_min, time->tm_sec); 58*78befb69Strem 59*78befb69Strem day = sec / (24 * 3600); 60*78befb69Strem sec = sec % (24 * 3600); 61*78befb69Strem hour = sec / 3600; 62*78befb69Strem sec = sec % 3600; 63*78befb69Strem min = sec / 60; 64*78befb69Strem sec = sec % 60; 65*78befb69Strem 66*78befb69Strem hour = (hour & HOUR_MASK) << HOUR_SHIFT; 67*78befb69Strem hour |= (min & MIN_MASK) << MIN_SHIFT; 68*78befb69Strem 69*78befb69Strem writel(day, &rtc_regs->dayr); 70*78befb69Strem writel(hour, &rtc_regs->hourmin); 71*78befb69Strem writel(sec, &rtc_regs->seconds); 72*78befb69Strem 73*78befb69Strem return 0; 74*78befb69Strem } 75*78befb69Strem 76*78befb69Strem void rtc_reset(void) 77*78befb69Strem { 78*78befb69Strem struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE; 79*78befb69Strem 80*78befb69Strem writel(0, &rtc_regs->dayr); 81*78befb69Strem writel(0, &rtc_regs->hourmin); 82*78befb69Strem writel(0, &rtc_regs->seconds); 83*78befb69Strem } 84