diff options
Diffstat (limited to 'drivers/rtc/x1205.c')
| -rw-r--r-- | drivers/rtc/x1205.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/drivers/rtc/x1205.c b/drivers/rtc/x1205.c new file mode 100644 index 0000000..319f051 --- /dev/null +++ b/drivers/rtc/x1205.c @@ -0,0 +1,178 @@ +/* + * (C) Copyright 2007 + * Stefan Roese, DENX Software Engineering, sr@denx.de. + * + * based on a the Linux rtc-x1207.c driver which is: + * Copyright 2004 Karen Spearel + * Copyright 2005 Alessandro Zummo + * + * Information and datasheet: + * http://www.intersil.com/cda/deviceinfo/0,1477,X1205,00.html + * + * 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 Xicor/Intersil X1205 RTC + */ + +/* #define DEBUG */ + +#include <common.h> +#include <command.h> +#include <rtc.h> +#include <i2c.h> +#include <bcd.h> + +#if defined(CONFIG_RTC_X1205) && defined(CONFIG_CMD_DATE) + +#define CCR_SEC 0 +#define CCR_MIN 1 +#define CCR_HOUR 2 +#define CCR_MDAY 3 +#define CCR_MONTH 4 +#define CCR_YEAR 5 +#define CCR_WDAY 6 +#define CCR_Y2K 7 + +#define X1205_REG_SR 0x3F /* status register */ +#define X1205_REG_Y2K 0x37 +#define X1205_REG_DW 0x36 +#define X1205_REG_YR 0x35 +#define X1205_REG_MO 0x34 +#define X1205_REG_DT 0x33 +#define X1205_REG_HR 0x32 +#define X1205_REG_MN 0x31 +#define X1205_REG_SC 0x30 +#define X1205_REG_DTR 0x13 +#define X1205_REG_ATR 0x12 +#define X1205_REG_INT 0x11 +#define X1205_REG_0 0x10 +#define X1205_REG_Y2K1 0x0F +#define X1205_REG_DWA1 0x0E +#define X1205_REG_YRA1 0x0D +#define X1205_REG_MOA1 0x0C +#define X1205_REG_DTA1 0x0B +#define X1205_REG_HRA1 0x0A +#define X1205_REG_MNA1 0x09 +#define X1205_REG_SCA1 0x08 +#define X1205_REG_Y2K0 0x07 +#define X1205_REG_DWA0 0x06 +#define X1205_REG_YRA0 0x05 +#define X1205_REG_MOA0 0x04 +#define X1205_REG_DTA0 0x03 +#define X1205_REG_HRA0 0x02 +#define X1205_REG_MNA0 0x01 +#define X1205_REG_SCA0 0x00 + +#define X1205_CCR_BASE 0x30 /* Base address of CCR */ +#define X1205_ALM0_BASE 0x00 /* Base address of ALARM0 */ + +#define X1205_SR_RTCF 0x01 /* Clock failure */ +#define X1205_SR_WEL 0x02 /* Write Enable Latch */ +#define X1205_SR_RWEL 0x04 /* Register Write Enable */ + +#define X1205_DTR_DTR0 0x01 +#define X1205_DTR_DTR1 0x02 +#define X1205_DTR_DTR2 0x04 + +#define X1205_HR_MIL 0x80 /* Set in ccr.hour for 24 hr mode */ + +static void rtc_write(int reg, u8 val) +{ + i2c_write(CFG_I2C_RTC_ADDR, reg, 2, &val, 1); +} + +/* + * In the routines that deal directly with the x1205 hardware, we use + * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch + * Epoch is initialized as 2000. Time is set to UTC. + */ +void rtc_get(struct rtc_time *tm) +{ + u8 buf[8]; + + i2c_read(CFG_I2C_RTC_ADDR, X1205_CCR_BASE, 2, buf, 8); + + debug("%s: raw read data - sec=%02x, min=%02x, hr=%02x, " + "mday=%02x, mon=%02x, year=%02x, wday=%02x, y2k=%02x\n", + __FUNCTION__, + buf[0], buf[1], buf[2], buf[3], + buf[4], buf[5], buf[6], buf[7]); + + tm->tm_sec = BCD2BIN(buf[CCR_SEC]); + tm->tm_min = BCD2BIN(buf[CCR_MIN]); + tm->tm_hour = BCD2BIN(buf[CCR_HOUR] & 0x3F); /* hr is 0-23 */ + tm->tm_mday = BCD2BIN(buf[CCR_MDAY]); + tm->tm_mon = BCD2BIN(buf[CCR_MONTH]); /* mon is 0-11 */ + tm->tm_year = BCD2BIN(buf[CCR_YEAR]) + + (BCD2BIN(buf[CCR_Y2K]) * 100); + tm->tm_wday = buf[CCR_WDAY]; + + debug("%s: tm is secs=%d, mins=%d, hours=%d, " + "mday=%d, mon=%d, year=%d, wday=%d\n", + __FUNCTION__, + tm->tm_sec, tm->tm_min, tm->tm_hour, + tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); +} + +void rtc_set(struct rtc_time *tm) +{ + int i; + u8 buf[8]; + + debug("Set 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); + + buf[CCR_SEC] = BIN2BCD(tm->tm_sec); + buf[CCR_MIN] = BIN2BCD(tm->tm_min); + + /* set hour and 24hr bit */ + buf[CCR_HOUR] = BIN2BCD(tm->tm_hour) | X1205_HR_MIL; + + buf[CCR_MDAY] = BIN2BCD(tm->tm_mday); + + /* month, 1 - 12 */ + buf[CCR_MONTH] = BIN2BCD(tm->tm_mon); + + /* year, since the rtc epoch*/ + buf[CCR_YEAR] = BIN2BCD(tm->tm_year % 100); + buf[CCR_WDAY] = tm->tm_wday & 0x07; + buf[CCR_Y2K] = BIN2BCD(tm->tm_year / 100); + + /* this sequence is required to unlock the chip */ + rtc_write(X1205_REG_SR, X1205_SR_WEL); + rtc_write(X1205_REG_SR, X1205_SR_WEL | X1205_SR_RWEL); + + /* write register's data */ + for (i = 0; i < 8; i++) + rtc_write(X1205_CCR_BASE + i, buf[i]); + + rtc_write(X1205_REG_SR, 0); +} + +void rtc_reset(void) +{ + /* + * Nothing to do + */ +} + +#endif |