178befb69Strem /* 278befb69Strem * Freescale i.MX27 RTC Driver 378befb69Strem * 478befb69Strem * Copyright (C) 2012 Philippe Reynes <tremyfr@yahoo.fr> 578befb69Strem * 6*1a459660SWolfgang Denk * SPDX-License-Identifier: GPL-2.0+ 778befb69Strem */ 878befb69Strem 978befb69Strem #include <common.h> 1078befb69Strem #include <rtc.h> 1178befb69Strem #include <asm/io.h> 1278befb69Strem #include <asm/arch/imx-regs.h> 1378befb69Strem 1478befb69Strem #define HOUR_SHIFT 8 1578befb69Strem #define HOUR_MASK 0x1f 1678befb69Strem #define MIN_SHIFT 0 1778befb69Strem #define MIN_MASK 0x3f 1878befb69Strem 1978befb69Strem int rtc_get(struct rtc_time *time) 2078befb69Strem { 2178befb69Strem struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE; 2278befb69Strem uint32_t day, hour, min, sec; 2378befb69Strem 2478befb69Strem day = readl(&rtc_regs->dayr); 2578befb69Strem hour = readl(&rtc_regs->hourmin); 2678befb69Strem sec = readl(&rtc_regs->seconds); 2778befb69Strem 2878befb69Strem min = (hour >> MIN_SHIFT) & MIN_MASK; 2978befb69Strem hour = (hour >> HOUR_SHIFT) & HOUR_MASK; 3078befb69Strem 3178befb69Strem sec += min * 60 + hour * 3600 + day * 24 * 3600; 3278befb69Strem 3378befb69Strem to_tm(sec, time); 3478befb69Strem 3578befb69Strem return 0; 3678befb69Strem } 3778befb69Strem 3878befb69Strem int rtc_set(struct rtc_time *time) 3978befb69Strem { 4078befb69Strem struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE; 4178befb69Strem uint32_t day, hour, min, sec; 4278befb69Strem 4378befb69Strem sec = mktime(time->tm_year, time->tm_mon, time->tm_mday, 4478befb69Strem time->tm_hour, time->tm_min, time->tm_sec); 4578befb69Strem 4678befb69Strem day = sec / (24 * 3600); 4778befb69Strem sec = sec % (24 * 3600); 4878befb69Strem hour = sec / 3600; 4978befb69Strem sec = sec % 3600; 5078befb69Strem min = sec / 60; 5178befb69Strem sec = sec % 60; 5278befb69Strem 5378befb69Strem hour = (hour & HOUR_MASK) << HOUR_SHIFT; 5478befb69Strem hour |= (min & MIN_MASK) << MIN_SHIFT; 5578befb69Strem 5678befb69Strem writel(day, &rtc_regs->dayr); 5778befb69Strem writel(hour, &rtc_regs->hourmin); 5878befb69Strem writel(sec, &rtc_regs->seconds); 5978befb69Strem 6078befb69Strem return 0; 6178befb69Strem } 6278befb69Strem 6378befb69Strem void rtc_reset(void) 6478befb69Strem { 6578befb69Strem struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE; 6678befb69Strem 6778befb69Strem writel(0, &rtc_regs->dayr); 6878befb69Strem writel(0, &rtc_regs->hourmin); 6978befb69Strem writel(0, &rtc_regs->seconds); 7078befb69Strem } 71