1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Freescale i.MX27 RTC Driver 4 * 5 * Copyright (C) 2012 Philippe Reynes <tremyfr@yahoo.fr> 6 */ 7 8 #include <common.h> 9 #include <rtc.h> 10 #include <asm/io.h> 11 #include <asm/arch/imx-regs.h> 12 13 #define HOUR_SHIFT 8 14 #define HOUR_MASK 0x1f 15 #define MIN_SHIFT 0 16 #define MIN_MASK 0x3f 17 18 int rtc_get(struct rtc_time *time) 19 { 20 struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE; 21 uint32_t day, hour, min, sec; 22 23 day = readl(&rtc_regs->dayr); 24 hour = readl(&rtc_regs->hourmin); 25 sec = readl(&rtc_regs->seconds); 26 27 min = (hour >> MIN_SHIFT) & MIN_MASK; 28 hour = (hour >> HOUR_SHIFT) & HOUR_MASK; 29 30 sec += min * 60 + hour * 3600 + day * 24 * 3600; 31 32 rtc_to_tm(sec, time); 33 34 return 0; 35 } 36 37 int rtc_set(struct rtc_time *time) 38 { 39 struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE; 40 uint32_t day, hour, min, sec; 41 42 sec = rtc_mktime(time); 43 44 day = sec / (24 * 3600); 45 sec = sec % (24 * 3600); 46 hour = sec / 3600; 47 sec = sec % 3600; 48 min = sec / 60; 49 sec = sec % 60; 50 51 hour = (hour & HOUR_MASK) << HOUR_SHIFT; 52 hour |= (min & MIN_MASK) << MIN_SHIFT; 53 54 writel(day, &rtc_regs->dayr); 55 writel(hour, &rtc_regs->hourmin); 56 writel(sec, &rtc_regs->seconds); 57 58 return 0; 59 } 60 61 void rtc_reset(void) 62 { 63 /* nothing to do */ 64 } 65