1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * Freescale i.MX28 RTC Driver 3*4882a593Smuzhiyun * 4*4882a593Smuzhiyun * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com> 5*4882a593Smuzhiyun * on behalf of DENX Software Engineering GmbH 6*4882a593Smuzhiyun * 7*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+ 8*4882a593Smuzhiyun */ 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun #include <common.h> 11*4882a593Smuzhiyun #include <rtc.h> 12*4882a593Smuzhiyun #include <asm/io.h> 13*4882a593Smuzhiyun #include <asm/arch/imx-regs.h> 14*4882a593Smuzhiyun #include <asm/arch/sys_proto.h> 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun #define MXS_RTC_MAX_TIMEOUT 1000000 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun /* Set time in seconds since 1970-01-01 */ mxs_rtc_set_time(uint32_t secs)19*4882a593Smuzhiyunint mxs_rtc_set_time(uint32_t secs) 20*4882a593Smuzhiyun { 21*4882a593Smuzhiyun struct mxs_rtc_regs *rtc_regs = (struct mxs_rtc_regs *)MXS_RTC_BASE; 22*4882a593Smuzhiyun int ret; 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun writel(secs, &rtc_regs->hw_rtc_seconds); 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun /* 27*4882a593Smuzhiyun * The 0x80 here means seconds were copied to analog. This information 28*4882a593Smuzhiyun * is taken from the linux kernel driver for the STMP37xx RTC since 29*4882a593Smuzhiyun * documentation doesn't mention it. 30*4882a593Smuzhiyun */ 31*4882a593Smuzhiyun ret = mxs_wait_mask_clr(&rtc_regs->hw_rtc_stat_reg, 32*4882a593Smuzhiyun 0x80 << RTC_STAT_STALE_REGS_OFFSET, MXS_RTC_MAX_TIMEOUT); 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun if (ret) 35*4882a593Smuzhiyun printf("MXS RTC: Timeout waiting for update\n"); 36*4882a593Smuzhiyun 37*4882a593Smuzhiyun return ret; 38*4882a593Smuzhiyun } 39*4882a593Smuzhiyun rtc_get(struct rtc_time * time)40*4882a593Smuzhiyunint rtc_get(struct rtc_time *time) 41*4882a593Smuzhiyun { 42*4882a593Smuzhiyun struct mxs_rtc_regs *rtc_regs = (struct mxs_rtc_regs *)MXS_RTC_BASE; 43*4882a593Smuzhiyun uint32_t secs; 44*4882a593Smuzhiyun 45*4882a593Smuzhiyun secs = readl(&rtc_regs->hw_rtc_seconds); 46*4882a593Smuzhiyun rtc_to_tm(secs, time); 47*4882a593Smuzhiyun 48*4882a593Smuzhiyun return 0; 49*4882a593Smuzhiyun } 50*4882a593Smuzhiyun rtc_set(struct rtc_time * time)51*4882a593Smuzhiyunint rtc_set(struct rtc_time *time) 52*4882a593Smuzhiyun { 53*4882a593Smuzhiyun uint32_t secs; 54*4882a593Smuzhiyun 55*4882a593Smuzhiyun secs = rtc_mktime(time); 56*4882a593Smuzhiyun 57*4882a593Smuzhiyun return mxs_rtc_set_time(secs); 58*4882a593Smuzhiyun } 59*4882a593Smuzhiyun rtc_reset(void)60*4882a593Smuzhiyunvoid rtc_reset(void) 61*4882a593Smuzhiyun { 62*4882a593Smuzhiyun struct mxs_rtc_regs *rtc_regs = (struct mxs_rtc_regs *)MXS_RTC_BASE; 63*4882a593Smuzhiyun int ret; 64*4882a593Smuzhiyun 65*4882a593Smuzhiyun /* Set time to 1970-01-01 */ 66*4882a593Smuzhiyun mxs_rtc_set_time(0); 67*4882a593Smuzhiyun 68*4882a593Smuzhiyun /* Reset the RTC block */ 69*4882a593Smuzhiyun ret = mxs_reset_block(&rtc_regs->hw_rtc_ctrl_reg); 70*4882a593Smuzhiyun if (ret) 71*4882a593Smuzhiyun printf("MXS RTC: Block reset timeout\n"); 72*4882a593Smuzhiyun } 73