/* * rs5c372.c * * Device driver for Ricoh's Real Time Controller RS5C372A. * * Copyright (C) 2004 Gary Jennejohn garyj@denx.de * * Based in part in ds1307.c - * (C) Copyright 2001, 2002, 2003 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * Keith Outwater, keith_outwater@mvis.com` * Steven Scholz, steven.scholz@imc-berlin.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 version 2 as * published by the Free Software Foundation. * * 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 <common.h> #include <command.h> #include <rtc.h> #include <i2c.h> #if defined(CONFIG_RTC_RS5C372A) && defined(CONFIG_CMD_DATE) /* * Reads are always done starting with register 15, which requires some * jumping-through-hoops to access the data correctly. * * Writes are always done starting with register 0. */ #define DEBUG 0 #if DEBUG static unsigned int rtc_debug = DEBUG; #else #define rtc_debug 0 /* gcc will remove all the debug code for us */ #endif #ifndef CFG_I2C_RTC_ADDR #define CFG_I2C_RTC_ADDR 0x32 #endif #define RS5C372_RAM_SIZE 0x10 #define RATE_32000HZ 0x80 /* Rate Select 32.000KHz */ #define RATE_32768HZ 0x00 /* Rate Select 32.768KHz */ #define STATUS_XPT 0x10 /* data invalid because voltage was 0 */ #define USE_24HOUR_MODE 0x20 #define TWELVE_HOUR_MODE(n) ((((n) >> 5) & 1) == 0) #define HOURS_AP(n) (((n) >> 5) & 1) #define HOURS_12(n) bcd2bin((n) & 0x1F) #define HOURS_24(n) bcd2bin((n) & 0x3F) static uchar bin2bcd (unsigned int n); static unsigned bcd2bin (uchar c); static int setup_done = 0; static int rs5c372_readram(unsigned char *buf, int len) { int ret; ret = i2c_read(CFG_I2C_RTC_ADDR, 0, 0, buf, len); if (ret != 0) { printf("%s: failed to read\n", __FUNCTION__); return ret; } if (buf[0] & STATUS_XPT) printf("### Warning: RTC lost power\n"); return ret; } static void rs5c372_enable(void) { unsigned char buf[RS5C372_RAM_SIZE + 1]; int ret; /* note that this returns reg. 15 in buf[1] */ ret = rs5c372_readram(&buf[1], RS5C372_RAM_SIZE); if (ret != 0) { printf("%s: failed\n", __FUNCTION__); return; } buf[0] = 0; /* we want to start writing at register 0 so we have to copy the */ /* register contents up one slot */ for (ret = 2; ret < 9; ret++) buf[ret - 1] = buf[ret]; /* registers 0 to 6 (time values) are not touched */ buf[8] = RATE_32768HZ; /* reg. 7 */ buf[9] = 0; /* reg. 8 */ buf[10] = 0; /* reg. 9 */ buf[11] = 0; /* reg. 10 */ buf[12] = 0; /* reg. 11 */ buf[13] = 0; /* reg. 12 */ buf[14] = 0; /* reg. 13 */ buf[15] = 0; /* reg. 14 */ buf[16] = USE_24HOUR_MODE; /* reg. 15 */ ret = i2c_write(CFG_I2C_RTC_ADDR, 0, 0, buf, RS5C372_RAM_SIZE+1); if (ret != 0) { printf("%s: failed\n", __FUNCTION__); return; } setup_done = 1; return; } static void rs5c372_convert_to_time(struct rtc_time *dt, unsigned char *buf) { /* buf[0] is register 15 */ dt->tm_sec = bcd2bin(buf[1]); dt->tm_min = bcd2bin(buf[2]); if (TWELVE_HOUR_MODE(buf[0])) { dt->tm_hour = HOURS_12(buf[3]); if (HOURS_AP(buf[3])) /* PM */ dt->tm_hour += 12; } else /* 24-hour-mode */ dt->tm_hour = HOURS_24(buf[3]); dt->tm_mday = bcd2bin(buf[5]); dt->tm_mon = bcd2bin(buf[6]); dt->tm_year = bcd2bin(buf[7]); if (dt->tm_year >= 70) dt->tm_year += 1900; else dt->tm_year += 2000; /* 0 is Sunday */ dt->tm_wday = bcd2bin(buf[4] & 0x07); dt->tm_yday = 0; dt->tm_isdst= 0; if(rtc_debug > 2) { printf("rs5c372_convert_to_time: year = %d\n", dt->tm_year); printf("rs5c372_convert_to_time: mon = %d\n", dt->tm_mon); printf("rs5c372_convert_to_time: mday = %d\n", dt->tm_mday); printf("rs5c372_convert_to_time: hour = %d\n", dt->tm_hour); printf("rs5c372_convert_to_time: min = %d\n", dt->tm_min); printf("rs5c372_convert_to_time: sec = %d\n", dt->tm_sec); } } /* * Get the current time from the RTC */ void rtc_get (struct rtc_time *tmp) { unsigned char buf[RS5C372_RAM_SIZE]; int ret; if (!setup_done) rs5c372_enable(); if (!setup_done) return; memset(buf, 0, sizeof(buf)); /* note that this returns reg. 15 in buf[0] */ ret = rs5c372_readram(buf, RS5C372_RAM_SIZE); if (ret != 0) { printf("%s: failed\n", __FUNCTION__); return; } rs5c372_convert_to_time(tmp, buf); return; } /* * Set the RTC */ void rtc_set (struct rtc_time *tmp) { unsigned char buf[8], reg15; int ret; if (!setup_done) rs5c372_enable(); if (!setup_done) return; if(rtc_debug > 2) { printf("rtc_set: tm_year = %d\n", tmp->tm_year); printf("rtc_set: tm_mon = %d\n", tmp->tm_mon); printf("rtc_set: tm_mday = %d\n", tmp->tm_mday); printf("rtc_set: tm_hour = %d\n", tmp->tm_hour); printf("rtc_set: tm_min = %d\n", tmp->tm_min); printf("rtc_set: tm_sec = %d\n", tmp->tm_sec); } memset(buf, 0, sizeof(buf)); /* only read register 15 */ ret = i2c_read(CFG_I2C_RTC_ADDR, 0, 0, buf, 1); if (ret == 0) { /* need to save register 15 */ reg15 = buf[0]; buf[0] = 0; /* register address on RS5C372 */ buf[1] = bin2bcd(tmp->tm_sec); buf[2] = bin2bcd(tmp->tm_min); /* need to handle 12 hour mode */ if (TWELVE_HOUR_MODE(reg15)) { if (tmp->tm_hour >= 12) { /* PM */ /* 12 PM is a special case */ if (tmp->tm_hour == 12) buf[3] = bin2bcd(tmp->tm_hour); else buf[3] = bin2bcd(tmp->tm_hour - 12); buf[3] |= 0x20; } } else { buf[3] = bin2bcd(tmp->tm_hour); } buf[4] = bin2bcd(tmp->tm_wday); buf[5] = bin2bcd(tmp->tm_mday); buf[6] = bin2bcd(tmp->tm_mon); if (tmp->tm_year < 1970 || tmp->tm_year > 2069) printf("WARNING: year should be between 1970 and 2069!\n"); buf[7] = bin2bcd(tmp->tm_year % 100); ret = i2c_write(CFG_I2C_RTC_ADDR, 0, 0, buf, 8); if (ret != 0) printf("rs5c372_set_datetime(), i2c_master_send() returned %d\n",ret); } return; } /* * Reset the RTC. We set the date back to 1970-01-01. */ void rtc_reset (void) { struct rtc_time tmp; if (!setup_done) rs5c372_enable(); if (!setup_done) return; tmp.tm_year = 1970; tmp.tm_mon = 1; /* Jan. 1, 1970 was a Thursday */ tmp.tm_wday= 4; tmp.tm_mday= 1; tmp.tm_hour = 0; tmp.tm_min = 0; tmp.tm_sec = 0; rtc_set(&tmp); 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); return; } static unsigned int bcd2bin (unsigned char n) { return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F)); } static unsigned char bin2bcd (unsigned int n) { return (((n / 10) << 4) | (n % 10)); } #endif