diff options
Diffstat (limited to 'rtc/ds1374.c')
| -rw-r--r-- | rtc/ds1374.c | 253 |
1 files changed, 0 insertions, 253 deletions
diff --git a/rtc/ds1374.c b/rtc/ds1374.c deleted file mode 100644 index e773dd9..0000000 --- a/rtc/ds1374.c +++ /dev/null @@ -1,253 +0,0 @@ -/* - * (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 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 (no alarms) for Dallas Semiconductor (now Maxim) - * DS1374 Real Time Clock (RTC). - * - * based on ds1337.c - */ - -#include <common.h> -#include <command.h> -#include <rtc.h> -#include <i2c.h> - -#if (defined(CONFIG_RTC_DS1374)) && defined(CONFIG_CMD_DATE) - -/*---------------------------------------------------------------------*/ -#undef DEBUG_RTC -#define DEBUG_RTC - -#ifdef DEBUG_RTC -#define DEBUGR(fmt,args...) printf(fmt ,##args) -#else -#define DEBUGR(fmt,args...) -#endif -/*---------------------------------------------------------------------*/ - -#ifndef CFG_I2C_RTC_ADDR -# define CFG_I2C_RTC_ADDR 0x68 -#endif - -#if defined(CONFIG_RTC_DS1374) && (CFG_I2C_SPEED > 400000) -# error The DS1374 is specified up to 400kHz in fast mode! -#endif - -/* - * RTC register addresses - */ -#define RTC_TOD_CNT_BYTE0_ADDR 0x00 /* TimeOfDay */ -#define RTC_TOD_CNT_BYTE1_ADDR 0x01 -#define RTC_TOD_CNT_BYTE2_ADDR 0x02 -#define RTC_TOD_CNT_BYTE3_ADDR 0x03 - -#define RTC_WD_ALM_CNT_BYTE0_ADDR 0x04 -#define RTC_WD_ALM_CNT_BYTE1_ADDR 0x05 -#define RTC_WD_ALM_CNT_BYTE2_ADDR 0x06 - -#define RTC_CTL_ADDR 0x07 /* RTC-CoNTrol-register */ -#define RTC_SR_ADDR 0x08 /* RTC-StatusRegister */ -#define RTC_TCS_DS_ADDR 0x09 /* RTC-TrickleChargeSelect DiodeSelect-register */ - -#define RTC_CTL_BIT_AIE (1<<0) /* Bit 0 - Alarm Interrupt enable */ -#define RTC_CTL_BIT_RS1 (1<<1) /* Bit 1/2 - Rate Select square wave output */ -#define RTC_CTL_BIT_RS2 (1<<2) /* Bit 2/2 - Rate Select square wave output */ -#define RTC_CTL_BIT_WDSTR (1<<3) /* Bit 3 - Watchdog Reset Steering */ -#define RTC_CTL_BIT_BBSQW (1<<4) /* Bit 4 - Battery-Backed Square-Wave */ -#define RTC_CTL_BIT_WD_ALM (1<<5) /* Bit 5 - Watchdoc/Alarm Counter Select */ -#define RTC_CTL_BIT_WACE (1<<6) /* Bit 6 - Watchdog/Alarm Counter Enable WACE*/ -#define RTC_CTL_BIT_EN_OSC (1<<7) /* Bit 7 - Enable Oscilator */ - -#define RTC_SR_BIT_AF 0x01 /* Bit 0 = Alarm Flag */ -#define RTC_SR_BIT_OSF 0x80 /* Bit 7 - Osc Stop Flag */ - -typedef unsigned char boolean_t; - -#ifndef TRUE -#define TRUE ((boolean_t)(0==0)) -#endif -#ifndef FALSE -#define FALSE (!TRUE) -#endif - -const char RtcTodAddr[] = { - RTC_TOD_CNT_BYTE0_ADDR, - RTC_TOD_CNT_BYTE1_ADDR, - RTC_TOD_CNT_BYTE2_ADDR, - RTC_TOD_CNT_BYTE3_ADDR -}; - -static uchar rtc_read (uchar reg); -static void rtc_write (uchar reg, uchar val, boolean_t set); -static void rtc_write_raw (uchar reg, uchar val); - -/* - * Get the current time from the RTC - */ -void rtc_get (struct rtc_time *tm){ - - unsigned long time1, time2; - unsigned int limit; - unsigned char tmp; - unsigned int i; - - /* - * Since the reads are being performed one byte at a time, - * there is a chance that a carry will occur during the read. - * To detect this, 2 reads are performed and compared. - */ - limit = 10; - do { - i = 4; - time1 = 0; - while (i--) { - tmp = rtc_read(RtcTodAddr[i]); - time1 = (time1 << 8) | (tmp & 0xff); - } - - i = 4; - time2 = 0; - while (i--) { - tmp = rtc_read(RtcTodAddr[i]); - time2 = (time2 << 8) | (tmp & 0xff); - } - } while ((time1 != time2) && limit--); - - if (time1 != time2) { - printf("can't get consistent time from rtc chip\n"); - } - - DEBUGR ("Get RTC s since 1.1.1970: %d\n", time1); - - to_tm(time1, tm); /* To Gregorian Date */ - - if (rtc_read(RTC_SR_ADDR) & RTC_SR_BIT_OSF) - printf ("### Warning: RTC oscillator has stopped\n"); - - DEBUGR ("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); -} - -/* - * Set the RTC - */ -void rtc_set (struct rtc_time *tmp){ - - unsigned long time; - unsigned i; - - DEBUGR ("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); - - if (tmp->tm_year < 1970 || tmp->tm_year > 2069) - printf("WARNING: year should be between 1970 and 2069!\n"); - - time = mktime(tmp->tm_year, tmp->tm_mon, - tmp->tm_mday, tmp->tm_hour, - tmp->tm_min, tmp->tm_sec); - - DEBUGR ("Set RTC s since 1.1.1970: %d (0x%02x)\n", time, time); - - /* write to RTC_TOD_CNT_BYTEn_ADDR */ - for (i = 0; i <= 3; i++) { - rtc_write_raw(RtcTodAddr[i], (unsigned char)(time & 0xff)); - time = time >> 8; - } - - /* Start clock */ - rtc_write(RTC_CTL_ADDR, RTC_CTL_BIT_EN_OSC, FALSE); -} - -/* - * Reset the RTC. We setting the date back to 1970-01-01. - * We also enable the oscillator output on the SQW/OUT pin and program - * it for 32,768 Hz output. Note that according to the datasheet, turning - * on the square wave output increases the current drain on the backup - * battery to something between 480nA and 800nA. - */ -void rtc_reset (void){ - - struct rtc_time tmp; - - /* clear status flags */ - rtc_write (RTC_SR_ADDR, (RTC_SR_BIT_AF|RTC_SR_BIT_OSF), FALSE); /* clearing OSF and AF */ - - /* Initialise DS1374 oriented to MPC8349E-ADS */ - rtc_write (RTC_CTL_ADDR, (RTC_CTL_BIT_EN_OSC - |RTC_CTL_BIT_WACE - |RTC_CTL_BIT_AIE), FALSE);/* start osc, disable WACE, clear AIE - - set to 0 */ - rtc_write (RTC_CTL_ADDR, (RTC_CTL_BIT_WD_ALM - |RTC_CTL_BIT_WDSTR - |RTC_CTL_BIT_RS1 - |RTC_CTL_BIT_RS2 - |RTC_CTL_BIT_BBSQW), TRUE);/* disable WD/ALM, WDSTR set to INT-pin, - set BBSQW and SQW to 32k - - set to 1 */ - tmp.tm_year = 1970; - tmp.tm_mon = 1; - 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); - - rtc_write(RTC_WD_ALM_CNT_BYTE2_ADDR,0xAC, TRUE); - rtc_write(RTC_WD_ALM_CNT_BYTE1_ADDR,0xDE, TRUE); - rtc_write(RTC_WD_ALM_CNT_BYTE2_ADDR,0xAD, TRUE); -} - -/* - * Helper functions - */ -static uchar rtc_read (uchar reg) -{ - return (i2c_reg_read (CFG_I2C_RTC_ADDR, reg)); -} - -static void rtc_write (uchar reg, uchar val, boolean_t set) -{ - if (set == TRUE) { - val |= i2c_reg_read (CFG_I2C_RTC_ADDR, reg); - i2c_reg_write (CFG_I2C_RTC_ADDR, reg, val); - } else { - val = i2c_reg_read (CFG_I2C_RTC_ADDR, reg) & ~val; - i2c_reg_write (CFG_I2C_RTC_ADDR, reg, val); - } -} - -static void rtc_write_raw (uchar reg, uchar val) -{ - i2c_reg_write (CFG_I2C_RTC_ADDR, reg, val); -} -#endif |