303 lines
6.9 KiB
C
303 lines
6.9 KiB
C
/*
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* rs5c372.c
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*
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* Device driver for Ricoh's Real Time Controller RS5C372A.
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*
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* Copyright (C) 2004 Gary Jennejohn garyj@denx.de
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*
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* Based in part in ds1307.c -
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* (C) Copyright 2001, 2002, 2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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* Keith Outwater, keith_outwater@mvis.com`
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* Steven Scholz, steven.scholz@imc-berlin.de
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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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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#include <i2c.h>
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#if defined(CONFIG_RTC_RS5C372A) && defined(CONFIG_CMD_DATE)
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/*
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* Reads are always done starting with register 15, which requires some
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* jumping-through-hoops to access the data correctly.
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*
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* Writes are always done starting with register 0.
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*/
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#define DEBUG 0
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#if DEBUG
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static unsigned int rtc_debug = DEBUG;
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#else
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#define rtc_debug 0 /* gcc will remove all the debug code for us */
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#endif
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#ifndef CFG_I2C_RTC_ADDR
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#define CFG_I2C_RTC_ADDR 0x32
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#endif
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#define RS5C372_RAM_SIZE 0x10
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#define RATE_32000HZ 0x80 /* Rate Select 32.000KHz */
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#define RATE_32768HZ 0x00 /* Rate Select 32.768KHz */
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#define STATUS_XPT 0x10 /* data invalid because voltage was 0 */
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#define USE_24HOUR_MODE 0x20
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#define TWELVE_HOUR_MODE(n) ((((n) >> 5) & 1) == 0)
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#define HOURS_AP(n) (((n) >> 5) & 1)
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#define HOURS_12(n) bcd2bin((n) & 0x1F)
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#define HOURS_24(n) bcd2bin((n) & 0x3F)
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static uchar bin2bcd (unsigned int n);
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static unsigned bcd2bin (uchar c);
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static int setup_done = 0;
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static int
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rs5c372_readram(unsigned char *buf, int len)
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{
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int ret;
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ret = i2c_read(CFG_I2C_RTC_ADDR, 0, 0, buf, len);
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if (ret != 0) {
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printf("%s: failed to read\n", __FUNCTION__);
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return ret;
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}
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if (buf[0] & STATUS_XPT)
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printf("### Warning: RTC lost power\n");
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return ret;
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}
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static void
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rs5c372_enable(void)
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{
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unsigned char buf[RS5C372_RAM_SIZE + 1];
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int ret;
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/* note that this returns reg. 15 in buf[1] */
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ret = rs5c372_readram(&buf[1], RS5C372_RAM_SIZE);
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if (ret != 0) {
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printf("%s: failed\n", __FUNCTION__);
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return;
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}
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buf[0] = 0;
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/* we want to start writing at register 0 so we have to copy the */
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/* register contents up one slot */
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for (ret = 2; ret < 9; ret++)
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buf[ret - 1] = buf[ret];
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/* registers 0 to 6 (time values) are not touched */
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buf[8] = RATE_32768HZ; /* reg. 7 */
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buf[9] = 0; /* reg. 8 */
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buf[10] = 0; /* reg. 9 */
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buf[11] = 0; /* reg. 10 */
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buf[12] = 0; /* reg. 11 */
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buf[13] = 0; /* reg. 12 */
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buf[14] = 0; /* reg. 13 */
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buf[15] = 0; /* reg. 14 */
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buf[16] = USE_24HOUR_MODE; /* reg. 15 */
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ret = i2c_write(CFG_I2C_RTC_ADDR, 0, 0, buf, RS5C372_RAM_SIZE+1);
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if (ret != 0) {
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printf("%s: failed\n", __FUNCTION__);
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return;
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}
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setup_done = 1;
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return;
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}
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static void
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rs5c372_convert_to_time(struct rtc_time *dt, unsigned char *buf)
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{
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/* buf[0] is register 15 */
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dt->tm_sec = bcd2bin(buf[1]);
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dt->tm_min = bcd2bin(buf[2]);
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if (TWELVE_HOUR_MODE(buf[0])) {
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dt->tm_hour = HOURS_12(buf[3]);
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if (HOURS_AP(buf[3])) /* PM */
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dt->tm_hour += 12;
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} else /* 24-hour-mode */
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dt->tm_hour = HOURS_24(buf[3]);
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dt->tm_mday = bcd2bin(buf[5]);
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dt->tm_mon = bcd2bin(buf[6]);
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dt->tm_year = bcd2bin(buf[7]);
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if (dt->tm_year >= 70)
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dt->tm_year += 1900;
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else
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dt->tm_year += 2000;
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/* 0 is Sunday */
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dt->tm_wday = bcd2bin(buf[4] & 0x07);
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dt->tm_yday = 0;
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dt->tm_isdst= 0;
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if(rtc_debug > 2) {
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printf("rs5c372_convert_to_time: year = %d\n", dt->tm_year);
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printf("rs5c372_convert_to_time: mon = %d\n", dt->tm_mon);
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printf("rs5c372_convert_to_time: mday = %d\n", dt->tm_mday);
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printf("rs5c372_convert_to_time: hour = %d\n", dt->tm_hour);
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printf("rs5c372_convert_to_time: min = %d\n", dt->tm_min);
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printf("rs5c372_convert_to_time: sec = %d\n", dt->tm_sec);
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}
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}
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/*
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* Get the current time from the RTC
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*/
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void
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rtc_get (struct rtc_time *tmp)
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{
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unsigned char buf[RS5C372_RAM_SIZE];
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int ret;
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if (!setup_done)
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rs5c372_enable();
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if (!setup_done)
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return;
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memset(buf, 0, sizeof(buf));
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/* note that this returns reg. 15 in buf[0] */
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ret = rs5c372_readram(buf, RS5C372_RAM_SIZE);
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if (ret != 0) {
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printf("%s: failed\n", __FUNCTION__);
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return;
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}
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rs5c372_convert_to_time(tmp, buf);
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return;
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}
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/*
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* Set the RTC
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*/
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void
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rtc_set (struct rtc_time *tmp)
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{
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unsigned char buf[8], reg15;
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int ret;
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if (!setup_done)
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rs5c372_enable();
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if (!setup_done)
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return;
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if(rtc_debug > 2) {
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printf("rtc_set: tm_year = %d\n", tmp->tm_year);
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printf("rtc_set: tm_mon = %d\n", tmp->tm_mon);
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printf("rtc_set: tm_mday = %d\n", tmp->tm_mday);
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printf("rtc_set: tm_hour = %d\n", tmp->tm_hour);
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printf("rtc_set: tm_min = %d\n", tmp->tm_min);
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printf("rtc_set: tm_sec = %d\n", tmp->tm_sec);
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}
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memset(buf, 0, sizeof(buf));
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/* only read register 15 */
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ret = i2c_read(CFG_I2C_RTC_ADDR, 0, 0, buf, 1);
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if (ret == 0) {
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/* need to save register 15 */
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reg15 = buf[0];
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buf[0] = 0; /* register address on RS5C372 */
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buf[1] = bin2bcd(tmp->tm_sec);
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buf[2] = bin2bcd(tmp->tm_min);
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/* need to handle 12 hour mode */
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if (TWELVE_HOUR_MODE(reg15)) {
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if (tmp->tm_hour >= 12) { /* PM */
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/* 12 PM is a special case */
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if (tmp->tm_hour == 12)
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buf[3] = bin2bcd(tmp->tm_hour);
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else
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buf[3] = bin2bcd(tmp->tm_hour - 12);
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buf[3] |= 0x20;
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}
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} else {
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buf[3] = bin2bcd(tmp->tm_hour);
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}
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buf[4] = bin2bcd(tmp->tm_wday);
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buf[5] = bin2bcd(tmp->tm_mday);
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buf[6] = bin2bcd(tmp->tm_mon);
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if (tmp->tm_year < 1970 || tmp->tm_year > 2069)
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printf("WARNING: year should be between 1970 and 2069!\n");
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buf[7] = bin2bcd(tmp->tm_year % 100);
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ret = i2c_write(CFG_I2C_RTC_ADDR, 0, 0, buf, 8);
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if (ret != 0)
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printf("rs5c372_set_datetime(), i2c_master_send() returned %d\n",ret);
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}
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return;
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}
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/*
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* Reset the RTC. We set the date back to 1970-01-01.
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*/
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void
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rtc_reset (void)
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{
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struct rtc_time tmp;
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if (!setup_done)
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rs5c372_enable();
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if (!setup_done)
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return;
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tmp.tm_year = 1970;
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tmp.tm_mon = 1;
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/* Jan. 1, 1970 was a Thursday */
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tmp.tm_wday= 4;
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tmp.tm_mday= 1;
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tmp.tm_hour = 0;
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tmp.tm_min = 0;
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tmp.tm_sec = 0;
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rtc_set(&tmp);
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printf ("RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n",
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tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
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tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
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return;
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}
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static unsigned int
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bcd2bin (unsigned char n)
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{
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return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
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}
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static unsigned char
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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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#endif
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