mirror of
https://github.com/AsahiLinux/u-boot
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314 lines
7.2 KiB
C
314 lines
7.2 KiB
C
/*
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* board/eva/phantom.c
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*
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* Phantom RTC device driver for EVA
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*
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* Author: Sangmoon Kim
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* dogoil@etinsys.com
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*
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* Copyright 2002 Etinsys Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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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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#if defined(CONFIG_CMD_DATE)
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#define RTC_BASE (CONFIG_SYS_NVRAM_BASE_ADDR + 0x7fff8)
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#define RTC_YEAR ( RTC_BASE + 7 )
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#define RTC_MONTH ( RTC_BASE + 6 )
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#define RTC_DAY_OF_MONTH ( RTC_BASE + 5 )
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#define RTC_DAY_OF_WEEK ( RTC_BASE + 4 )
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#define RTC_HOURS ( RTC_BASE + 3 )
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#define RTC_MINUTES ( RTC_BASE + 2 )
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#define RTC_SECONDS ( RTC_BASE + 1 )
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#define RTC_CENTURY ( RTC_BASE + 0 )
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#define RTC_CONTROLA RTC_CENTURY
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#define RTC_CONTROLB RTC_SECONDS
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#define RTC_CONTROLC RTC_DAY_OF_WEEK
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#define RTC_CA_WRITE 0x80
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#define RTC_CA_READ 0x40
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#define RTC_CB_OSC_DISABLE 0x80
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#define RTC_CC_BATTERY_FLAG 0x80
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#define RTC_CC_FREQ_TEST 0x40
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static int phantom_flag = -1;
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static int century_flag = -1;
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static uchar rtc_read(unsigned int addr)
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{
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return *(volatile unsigned char *)(addr);
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}
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static void rtc_write(unsigned int addr, uchar val)
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{
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*(volatile unsigned char *)(addr) = val;
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}
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static unsigned char phantom_rtc_sequence[] = {
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0xc5, 0x3a, 0xa3, 0x5c, 0xc5, 0x3a, 0xa3, 0x5c
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};
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static unsigned char* phantom_rtc_read(int addr, unsigned char rtc[8])
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{
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int i, j;
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unsigned char v;
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unsigned char save = rtc_read(addr);
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for (j = 0; j < 8; j++) {
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v = phantom_rtc_sequence[j];
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for (i = 0; i < 8; i++) {
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rtc_write(addr, v & 1);
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v >>= 1;
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}
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}
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for (j = 0; j < 8; j++) {
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v = 0;
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for (i = 0; i < 8; i++) {
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if(rtc_read(addr) & 1)
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v |= 1 << i;
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}
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rtc[j] = v;
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}
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rtc_write(addr, save);
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return rtc;
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}
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static void phantom_rtc_write(int addr, unsigned char rtc[8])
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{
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int i, j;
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unsigned char v;
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unsigned char save = rtc_read(addr);
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for (j = 0; j < 8; j++) {
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v = phantom_rtc_sequence[j];
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for (i = 0; i < 8; i++) {
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rtc_write(addr, v & 1);
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v >>= 1;
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}
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}
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for (j = 0; j < 8; j++) {
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v = rtc[j];
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for (i = 0; i < 8; i++) {
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rtc_write(addr, v & 1);
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v >>= 1;
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}
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}
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rtc_write(addr, save);
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}
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static int get_phantom_flag(void)
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{
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int i;
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unsigned char rtc[8];
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phantom_rtc_read(RTC_BASE, rtc);
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for(i = 1; i < 8; i++) {
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if (rtc[i] != rtc[0])
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return 1;
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}
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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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if (phantom_flag < 0)
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phantom_flag = get_phantom_flag();
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if (phantom_flag) {
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unsigned char rtc[8];
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phantom_rtc_read(RTC_BASE, rtc);
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if(rtc[4] & 0x30) {
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printf( "real-time-clock was stopped. Now starting...\n" );
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rtc[4] &= 0x07;
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phantom_rtc_write(RTC_BASE, rtc);
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}
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} else {
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uchar reg_a, reg_b, reg_c;
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reg_a = rtc_read( RTC_CONTROLA );
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reg_b = rtc_read( RTC_CONTROLB );
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if ( reg_b & RTC_CB_OSC_DISABLE )
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{
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printf( "real-time-clock was stopped. Now starting...\n" );
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reg_a |= RTC_CA_WRITE;
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reg_b &= ~RTC_CB_OSC_DISABLE;
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rtc_write( RTC_CONTROLA, reg_a );
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rtc_write( RTC_CONTROLB, reg_b );
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}
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/* make sure read/write clock register bits are cleared */
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reg_a &= ~( RTC_CA_WRITE | RTC_CA_READ );
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rtc_write( RTC_CONTROLA, reg_a );
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reg_c = rtc_read( RTC_CONTROLC );
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if (( reg_c & RTC_CC_BATTERY_FLAG ) == 0 )
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printf( "RTC battery low. Clock setting may not be reliable.\n");
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}
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}
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inline unsigned bcd2bin (uchar n)
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{
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return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
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}
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inline unsigned char bin2bcd (unsigned int n)
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{
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return (((n / 10) << 4) | (n % 10));
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}
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static int get_century_flag(void)
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{
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int flag = 0;
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int bcd, century;
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bcd = rtc_read( RTC_CENTURY );
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century = bcd2bin( bcd & 0x3F );
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rtc_write( RTC_CENTURY, bin2bcd(century+1));
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if (bcd == rtc_read( RTC_CENTURY ))
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flag = 1;
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rtc_write( RTC_CENTURY, bcd);
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return flag;
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}
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int rtc_get( struct rtc_time *tmp)
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{
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if (phantom_flag < 0)
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phantom_flag = get_phantom_flag();
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if (phantom_flag)
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{
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unsigned char rtc[8];
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phantom_rtc_read(RTC_BASE, rtc);
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tmp->tm_sec = bcd2bin(rtc[1] & 0x7f);
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tmp->tm_min = bcd2bin(rtc[2] & 0x7f);
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tmp->tm_hour = bcd2bin(rtc[3] & 0x1f);
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tmp->tm_wday = bcd2bin(rtc[4] & 0x7);
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tmp->tm_mday = bcd2bin(rtc[5] & 0x3f);
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tmp->tm_mon = bcd2bin(rtc[6] & 0x1f);
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tmp->tm_year = bcd2bin(rtc[7]) + 1900;
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tmp->tm_yday = 0;
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tmp->tm_isdst = 0;
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if( (rtc[3] & 0x80) && (rtc[3] & 0x40) ) tmp->tm_hour += 12;
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if (tmp->tm_year < 1970) tmp->tm_year += 100;
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} else {
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uchar sec, min, hour;
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uchar mday, wday, mon, year;
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int century;
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uchar reg_a;
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if (century_flag < 0)
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century_flag = get_century_flag();
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reg_a = rtc_read( RTC_CONTROLA );
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/* lock clock registers for read */
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rtc_write( RTC_CONTROLA, ( reg_a | RTC_CA_READ ));
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sec = rtc_read( RTC_SECONDS );
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min = rtc_read( RTC_MINUTES );
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hour = rtc_read( RTC_HOURS );
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mday = rtc_read( RTC_DAY_OF_MONTH );
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wday = rtc_read( RTC_DAY_OF_WEEK );
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mon = rtc_read( RTC_MONTH );
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year = rtc_read( RTC_YEAR );
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century = rtc_read( RTC_CENTURY );
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/* unlock clock registers after read */
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rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_READ ));
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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( mday & 0x3F );
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tmp->tm_mon = bcd2bin( mon & 0x1F );
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tmp->tm_wday = bcd2bin( wday & 0x07 );
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if (century_flag) {
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tmp->tm_year = bcd2bin( year ) +
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( bcd2bin( century & 0x3F ) * 100 );
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} else {
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tmp->tm_year = bcd2bin( year ) + 1900;
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if (tmp->tm_year < 1970) tmp->tm_year += 100;
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}
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tmp->tm_yday = 0;
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tmp->tm_isdst= 0;
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}
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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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if (phantom_flag < 0)
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phantom_flag = get_phantom_flag();
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if (phantom_flag) {
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uint year;
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unsigned char rtc[8];
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year = tmp->tm_year;
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year -= (year < 2000) ? 1900 : 2000;
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rtc[0] = bin2bcd(0);
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rtc[1] = bin2bcd(tmp->tm_sec);
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rtc[2] = bin2bcd(tmp->tm_min);
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rtc[3] = bin2bcd(tmp->tm_hour);
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rtc[4] = bin2bcd(tmp->tm_wday);
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rtc[5] = bin2bcd(tmp->tm_mday);
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rtc[6] = bin2bcd(tmp->tm_mon);
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rtc[7] = bin2bcd(year);
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phantom_rtc_write(RTC_BASE, rtc);
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} else {
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uchar reg_a;
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if (century_flag < 0)
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century_flag = get_century_flag();
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/* lock clock registers for write */
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reg_a = rtc_read( RTC_CONTROLA );
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rtc_write( RTC_CONTROLA, ( reg_a | RTC_CA_WRITE ));
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rtc_write( RTC_MONTH, bin2bcd( tmp->tm_mon ));
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rtc_write( RTC_DAY_OF_WEEK, bin2bcd( tmp->tm_wday ));
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rtc_write( RTC_DAY_OF_MONTH, bin2bcd( tmp->tm_mday ));
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rtc_write( RTC_HOURS, bin2bcd( tmp->tm_hour ));
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rtc_write( RTC_MINUTES, bin2bcd( tmp->tm_min ));
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rtc_write( RTC_SECONDS, bin2bcd( tmp->tm_sec ));
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/* break year up into century and year in century */
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if (century_flag) {
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rtc_write( RTC_YEAR, bin2bcd( tmp->tm_year % 100 ));
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rtc_write( RTC_CENTURY, bin2bcd( tmp->tm_year / 100 ));
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reg_a &= 0xc0;
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reg_a |= bin2bcd( tmp->tm_year / 100 );
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} else {
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rtc_write(RTC_YEAR, bin2bcd(tmp->tm_year -
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((tmp->tm_year < 2000) ? 1900 : 2000)));
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}
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/* unlock clock registers after read */
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rtc_write( RTC_CONTROLA, ( reg_a & ~RTC_CA_WRITE ));
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}
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return 0;
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}
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#endif
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