1 /* 2 * Freescale i.MX27 RTC Driver 3 * 4 * Copyright (C) 2012 Philippe Reynes <tremyfr@yahoo.fr> 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <common.h> 10 #include <rtc.h> 11 #include <asm/io.h> 12 #include <asm/arch/imx-regs.h> 13 14 #define HOUR_SHIFT 8 15 #define HOUR_MASK 0x1f 16 #define MIN_SHIFT 0 17 #define MIN_MASK 0x3f 18 19 int rtc_get(struct rtc_time *time) 20 { 21 struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE; 22 uint32_t day, hour, min, sec; 23 24 day = readl(&rtc_regs->dayr); 25 hour = readl(&rtc_regs->hourmin); 26 sec = readl(&rtc_regs->seconds); 27 28 min = (hour >> MIN_SHIFT) & MIN_MASK; 29 hour = (hour >> HOUR_SHIFT) & HOUR_MASK; 30 31 sec += min * 60 + hour * 3600 + day * 24 * 3600; 32 33 rtc_to_tm(sec, time); 34 35 return 0; 36 } 37 38 int rtc_set(struct rtc_time *time) 39 { 40 struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE; 41 uint32_t day, hour, min, sec; 42 43 sec = rtc_mktime(time); 44 45 day = sec / (24 * 3600); 46 sec = sec % (24 * 3600); 47 hour = sec / 3600; 48 sec = sec % 3600; 49 min = sec / 60; 50 sec = sec % 60; 51 52 hour = (hour & HOUR_MASK) << HOUR_SHIFT; 53 hour |= (min & MIN_MASK) << MIN_SHIFT; 54 55 writel(day, &rtc_regs->dayr); 56 writel(hour, &rtc_regs->hourmin); 57 writel(sec, &rtc_regs->seconds); 58 59 return 0; 60 } 61 62 void rtc_reset(void) 63 { 64 struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE; 65 66 writel(0, &rtc_regs->dayr); 67 writel(0, &rtc_regs->hourmin); 68 writel(0, &rtc_regs->seconds); 69 } 70