+++ /dev/null
-/*
- * 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
projects / karo-tx-uboot.git / blobdiff