/* * (C) Copyright 2003 * * SPDX-License-Identifier: GPL-2.0+ */ /* * Date & Time support for the DS12887 RTC */ #undef RTC_DEBUG #include <common.h> #include <command.h> #include <config.h> #include <rtc.h> #if defined(CONFIG_CMD_DATE) #define RTC_SECONDS 0x00 #define RTC_SECONDS_ALARM 0x01 #define RTC_MINUTES 0x02 #define RTC_MINUTES_ALARM 0x03 #define RTC_HOURS 0x04 #define RTC_HOURS_ALARM 0x05 #define RTC_DAY_OF_WEEK 0x06 #define RTC_DATE_OF_MONTH 0x07 #define RTC_MONTH 0x08 #define RTC_YEAR 0x09 #define RTC_CONTROL_A 0x0A #define RTC_CONTROL_B 0x0B #define RTC_CONTROL_C 0x0C #define RTC_CONTROL_D 0x0D #define RTC_CA_UIP 0x80 #define RTC_CB_DM 0x04 #define RTC_CB_24_12 0x02 #define RTC_CB_SET 0x80 #if defined(CONFIG_ATC) static uchar rtc_read (uchar reg) { uchar val; *(volatile unsigned char*)(RTC_PORT_ADDR) = reg; __asm__ __volatile__ ("sync"); val = *(volatile unsigned char*)(RTC_PORT_DATA); return (val); } static void rtc_write (uchar reg, uchar val) { *(volatile unsigned char*)(RTC_PORT_ADDR) = reg; __asm__ __volatile__ ("sync"); *(volatile unsigned char*)(RTC_PORT_DATA) = val; __asm__ __volatile__ ("sync"); } #else # error Board specific rtc access functions should be supplied #endif int rtc_get (struct rtc_time *tmp) { uchar sec, min, hour, mday, wday, mon, year; /* check if rtc is available for access */ while( rtc_read(RTC_CONTROL_A) & RTC_CA_UIP) ; sec = rtc_read(RTC_SECONDS); min = rtc_read(RTC_MINUTES); hour = rtc_read(RTC_HOURS); mday = rtc_read(RTC_DATE_OF_MONTH); wday = rtc_read(RTC_DAY_OF_WEEK); mon = rtc_read(RTC_MONTH); year = rtc_read(RTC_YEAR); #ifdef RTC_DEBUG printf( "Get RTC year: %d; mon: %d; mday: %d; wday: %d; " "hr: %d; min: %d; sec: %d\n", year, mon, mday, wday, hour, min, sec ); printf ( "Alarms: hour: %02x min: %02x sec: %02x\n", rtc_read (RTC_HOURS_ALARM), rtc_read (RTC_MINUTES_ALARM), rtc_read (RTC_SECONDS_ALARM) ); #endif if( !(rtc_read(RTC_CONTROL_B) & RTC_CB_DM)) { /* Information is in BCD format */ printf(" Get: Convert BSD to BIN\n"); tmp->tm_sec = bcd2bin (sec & 0x7F); tmp->tm_min = bcd2bin (min & 0x7F); tmp->tm_hour = bcd2bin (hour & 0x3F); tmp->tm_mday = bcd2bin (mday & 0x3F); tmp->tm_mon = bcd2bin (mon & 0x1F); tmp->tm_year = bcd2bin (year); tmp->tm_wday = bcd2bin (wday & 0x07); } else { tmp->tm_sec = sec & 0x7F; tmp->tm_min = min & 0x7F; tmp->tm_hour = hour & 0x3F; tmp->tm_mday = mday & 0x3F; tmp->tm_mon = mon & 0x1F; tmp->tm_year = year; tmp->tm_wday = wday & 0x07; } if(tmp->tm_year<70) tmp->tm_year+=2000; else tmp->tm_year+=1900; tmp->tm_yday = 0; tmp->tm_isdst= 0; #ifdef RTC_DEBUG printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, tmp->tm_hour, tmp->tm_min, tmp->tm_sec); #endif return 0; } int rtc_set (struct rtc_time *tmp) { uchar save_ctrl_b; uchar sec, min, hour, mday, wday, mon, year; #ifdef RTC_DEBUG printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, tmp->tm_hour, tmp->tm_min, tmp->tm_sec); #endif if( !(rtc_read(RTC_CONTROL_B) & RTC_CB_DM)) { /* Information is in BCD format */ year = bin2bcd(tmp->tm_year % 100); mon = bin2bcd(tmp->tm_mon); wday = bin2bcd(tmp->tm_wday); mday = bin2bcd(tmp->tm_mday); hour = bin2bcd(tmp->tm_hour); min = bin2bcd(tmp->tm_min); sec = bin2bcd(tmp->tm_sec); } else { year = tmp->tm_year % 100; mon = tmp->tm_mon; wday = tmp->tm_wday; mday = tmp->tm_mday; hour = tmp->tm_hour; min = tmp->tm_min; sec = tmp->tm_sec; } /* disables the RTC to update the regs */ save_ctrl_b = rtc_read(RTC_CONTROL_B); save_ctrl_b |= RTC_CB_SET; rtc_write(RTC_CONTROL_B, save_ctrl_b); rtc_write (RTC_YEAR, year); rtc_write (RTC_MONTH, mon); rtc_write (RTC_DAY_OF_WEEK, wday); rtc_write (RTC_DATE_OF_MONTH, mday); rtc_write (RTC_HOURS, hour); rtc_write (RTC_MINUTES, min); rtc_write (RTC_SECONDS, sec); /* enables the RTC to update the regs */ save_ctrl_b &= ~RTC_CB_SET; rtc_write(RTC_CONTROL_B, save_ctrl_b); return 0; } void rtc_reset (void) { struct rtc_time tmp; uchar ctrl_rg; ctrl_rg = RTC_CB_SET; rtc_write(RTC_CONTROL_B,ctrl_rg); tmp.tm_year = 1970 % 100; tmp.tm_mon = 1; tmp.tm_mday= 1; tmp.tm_hour = 0; tmp.tm_min = 0; tmp.tm_sec = 0; #ifdef RTC_DEBUG printf ( "RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n", tmp.tm_year, tmp.tm_mon, tmp.tm_mday, tmp.tm_hour, tmp.tm_min, tmp.tm_sec); #endif ctrl_rg = RTC_CB_SET | RTC_CB_24_12 | RTC_CB_DM; rtc_write(RTC_CONTROL_B,ctrl_rg); rtc_set(&tmp); rtc_write(RTC_HOURS_ALARM, 0), rtc_write(RTC_MINUTES_ALARM, 0), rtc_write(RTC_SECONDS_ALARM, 0); ctrl_rg = RTC_CB_24_12 | RTC_CB_DM; rtc_write(RTC_CONTROL_B,ctrl_rg); } #endif