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135 lines
3.2 KiB
135 lines
3.2 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* (C) Copyright 2001 |
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* Erik Theisen, Wave 7 Optics, [email protected]. |
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*/ |
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/* |
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* Date & Time support for ST Electronics M48T35Ax RTC |
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*/ |
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/*#define DEBUG */ |
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#include <common.h> |
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#include <command.h> |
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#include <rtc.h> |
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#include <config.h> |
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static uchar rtc_read (uchar reg); |
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static void rtc_write (uchar reg, uchar val); |
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/* ------------------------------------------------------------------------- */ |
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int rtc_get (struct rtc_time *tmp) |
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{ |
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uchar sec, min, hour, cent_day, date, month, year; |
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uchar ccr; /* Clock control register */ |
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/* Lock RTC for read using clock control register */ |
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ccr = rtc_read(0); |
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ccr = ccr | 0x40; |
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rtc_write(0, ccr); |
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sec = rtc_read (0x1); |
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min = rtc_read (0x2); |
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hour = rtc_read (0x3); |
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cent_day= rtc_read (0x4); |
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date = rtc_read (0x5); |
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month = rtc_read (0x6); |
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year = rtc_read (0x7); |
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/* UNLock RTC */ |
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ccr = rtc_read(0); |
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ccr = ccr & 0xBF; |
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rtc_write(0, ccr); |
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debug ( "Get RTC year: %02x month: %02x date: %02x cent_day: %02x " |
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"hr: %02x min: %02x sec: %02x\n", |
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year, month, date, cent_day, |
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hour, min, sec ); |
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tmp->tm_sec = bcd2bin (sec & 0x7F); |
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tmp->tm_min = bcd2bin (min & 0x7F); |
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tmp->tm_hour = bcd2bin (hour & 0x3F); |
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tmp->tm_mday = bcd2bin (date & 0x3F); |
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tmp->tm_mon = bcd2bin (month & 0x1F); |
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tmp->tm_year = bcd2bin (year) + ((cent_day & 0x10) ? 2000 : 1900); |
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tmp->tm_wday = bcd2bin (cent_day & 0x07); |
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tmp->tm_yday = 0; |
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tmp->tm_isdst= 0; |
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debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", |
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tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, |
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec); |
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return 0; |
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} |
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int rtc_set (struct rtc_time *tmp) |
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{ |
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uchar ccr; /* Clock control register */ |
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uchar century; |
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debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", |
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tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, |
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec); |
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/* Lock RTC for write using clock control register */ |
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ccr = rtc_read(0); |
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ccr = ccr | 0x80; |
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rtc_write(0, ccr); |
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rtc_write (0x07, bin2bcd(tmp->tm_year % 100)); |
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rtc_write (0x06, bin2bcd(tmp->tm_mon)); |
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rtc_write (0x05, bin2bcd(tmp->tm_mday)); |
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century = ((tmp->tm_year >= 2000) ? 0x10 : 0) | 0x20; |
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rtc_write (0x04, bin2bcd(tmp->tm_wday) | century); |
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rtc_write (0x03, bin2bcd(tmp->tm_hour)); |
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rtc_write (0x02, bin2bcd(tmp->tm_min )); |
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rtc_write (0x01, bin2bcd(tmp->tm_sec )); |
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/* UNLock RTC */ |
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ccr = rtc_read(0); |
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ccr = ccr & 0x7F; |
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rtc_write(0, ccr); |
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return 0; |
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} |
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void rtc_reset (void) |
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{ |
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uchar val; |
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/* Clear all clock control registers */ |
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rtc_write (0x0, 0x80); /* No Read Lock or calibration */ |
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/* Clear stop bit */ |
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val = rtc_read (0x1); |
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val &= 0x7f; |
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rtc_write(0x1, val); |
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/* Enable century / disable frequency test */ |
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val = rtc_read (0x4); |
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val = (val & 0xBF) | 0x20; |
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rtc_write(0x4, val); |
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/* Clear write lock */ |
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rtc_write(0x0, 0); |
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} |
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/* ------------------------------------------------------------------------- */ |
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static uchar rtc_read (uchar reg) |
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{ |
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return *(unsigned char *) |
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((CONFIG_SYS_NVRAM_BASE_ADDR + CONFIG_SYS_NVRAM_SIZE - 8) + reg); |
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} |
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static void rtc_write (uchar reg, uchar val) |
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{ |
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*(unsigned char *) |
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((CONFIG_SYS_NVRAM_BASE_ADDR + CONFIG_SYS_NVRAM_SIZE - 8) + reg) = val; |
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}
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