/* * (C) Copyright 2008, 2009 * Andreas Pfefferle, DENX Software Engineering, ap@denx.de. * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ #include <asm/io.h> #include <common.h> #include <command.h> #include <config.h> #include <rtc.h> #include <tws.h> #if defined(CONFIG_CMD_DATE) /* * Note: The acrobatics below is due to the hideously ingenius idea of * the chip designers. As the chip does not allow register * addressing, all values need to be read and written in one go. Sure * enough, the 'wday' field (0-6) is transferred using the economic * number of 4 bits right in the middle of the packet..... */ int rtc_get(struct rtc_time *tm) { int rel = 0; uchar buffer[7]; memset(buffer, 0, 7); /* Read 52 bits into our buffer */ tws_read(buffer, 52); tm->tm_sec = bcd2bin( buffer[0] & 0x7F); tm->tm_min = bcd2bin( buffer[1] & 0x7F); tm->tm_hour = bcd2bin( buffer[2] & 0x3F); tm->tm_wday = bcd2bin( buffer[3] & 0x07); tm->tm_mday = bcd2bin((buffer[3] & 0xF0) >> 4 | (buffer[4] & 0x0F) << 4); tm->tm_mon = bcd2bin((buffer[4] & 0x30) >> 4 | (buffer[5] & 0x0F) << 4); tm->tm_year = bcd2bin((buffer[5] & 0xF0) >> 4 | (buffer[6] & 0x0F) << 4) + 2000; tm->tm_yday = 0; tm->tm_isdst = 0; if (tm->tm_sec & 0x80) { puts("### Warning: RTC Low Voltage - date/time not reliable\n"); rel = -1; } debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec); return rel; } int rtc_set(struct rtc_time *tm) { uchar buffer[7]; uchar tmp; debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec); memset(buffer, 0, 7); buffer[0] = bin2bcd(tm->tm_sec); buffer[1] = bin2bcd(tm->tm_min); buffer[2] = bin2bcd(tm->tm_hour); buffer[3] = bin2bcd(tm->tm_wday); tmp = bin2bcd(tm->tm_mday); buffer[3] |= (tmp & 0x0F) << 4; buffer[4] = (tmp & 0xF0) >> 4; tmp = bin2bcd(tm->tm_mon); buffer[4] |= (tmp & 0x0F) << 4; buffer[5] = (tmp & 0xF0) >> 4; tmp = bin2bcd(tm->tm_year % 100); buffer[5] |= (tmp & 0x0F) << 4; buffer[6] = (tmp & 0xF0) >> 4; /* Write the resulting 52 bits to device */ tws_write(buffer, 52); return 0; } void rtc_reset(void) { struct rtc_time tmp; tmp.tm_sec = 0; tmp.tm_min = 0; tmp.tm_hour = 0; tmp.tm_wday = 4; tmp.tm_mday = 1; tmp.tm_mon = 1; tmp.tm_year = 2000; rtc_set(&tmp); } #endif