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