| /* |
| * (C) Copyright 2004 |
| * Wolfgang Denk, DENX Software Engineering, wd@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 |
| */ |
| |
| /* |
| * Date & Time support for MAXIM MAX6900 RTC |
| */ |
| |
| /* #define DEBUG */ |
| |
| #include <common.h> |
| #include <command.h> |
| #include <rtc.h> |
| #include <i2c.h> |
| |
| #if defined(CONFIG_RTC_MAX6900) && defined(CONFIG_CMD_DATE) |
| |
| #ifndef CFG_I2C_RTC_ADDR |
| #define CFG_I2C_RTC_ADDR 0x50 |
| #endif |
| |
| /* ------------------------------------------------------------------------- */ |
| |
| static uchar rtc_read (uchar reg) |
| { |
| return (i2c_reg_read (CFG_I2C_RTC_ADDR, reg)); |
| } |
| |
| static void rtc_write (uchar reg, uchar val) |
| { |
| i2c_reg_write (CFG_I2C_RTC_ADDR, reg, val); |
| udelay(2500); |
| } |
| |
| static unsigned bcd2bin (uchar n) |
| { |
| return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F)); |
| } |
| |
| static unsigned char bin2bcd (unsigned int n) |
| { |
| return (((n / 10) << 4) | (n % 10)); |
| } |
| |
| /* ------------------------------------------------------------------------- */ |
| |
| void rtc_get (struct rtc_time *tmp) |
| { |
| uchar sec, min, hour, mday, wday, mon, cent, year; |
| int retry = 1; |
| |
| do { |
| sec = rtc_read (0x80); |
| min = rtc_read (0x82); |
| hour = rtc_read (0x84); |
| mday = rtc_read (0x86); |
| mon = rtc_read (0x88); |
| wday = rtc_read (0x8a); |
| year = rtc_read (0x8c); |
| cent = rtc_read (0x92); |
| /* |
| * Check for seconds rollover |
| */ |
| if ((sec != 59) || (rtc_read(0x80) == sec)){ |
| retry = 0; |
| } |
| } while (retry); |
| |
| debug ( "Get RTC year: %02x mon: %02x cent: %02x mday: %02x wday: %02x " |
| "hr: %02x min: %02x sec: %02x\n", |
| year, mon, cent, mday, wday, |
| hour, min, sec ); |
| |
| 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) + bcd2bin(cent) * 100; |
| tmp->tm_wday = bcd2bin (wday & 0x07); |
| tmp->tm_yday = 0; |
| tmp->tm_isdst= 0; |
| |
| debug ( "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); |
| } |
| |
| void rtc_set (struct rtc_time *tmp) |
| { |
| |
| debug ( "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); |
| |
| rtc_write (0x9E, 0x00); |
| rtc_write (0x80, 0); /* Clear seconds to ensure no rollover */ |
| rtc_write (0x92, bin2bcd(tmp->tm_year / 100)); |
| rtc_write (0x8c, bin2bcd(tmp->tm_year % 100)); |
| rtc_write (0x8a, bin2bcd(tmp->tm_wday)); |
| rtc_write (0x88, bin2bcd(tmp->tm_mon)); |
| rtc_write (0x86, bin2bcd(tmp->tm_mday)); |
| rtc_write (0x84, bin2bcd(tmp->tm_hour)); |
| rtc_write (0x82, bin2bcd(tmp->tm_min )); |
| rtc_write (0x80, bin2bcd(tmp->tm_sec )); |
| } |
| |
| void rtc_reset (void) |
| { |
| } |
| |
| #endif |