forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
130 lines
3.8 KiB
130 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0+ |
|
/* |
|
* (C) Copyright 2008 |
|
* Stefan Roese, DENX Software Engineering, [email protected]. |
|
* |
|
* based on a the Linux rtc-m41t80.c driver which is: |
|
* Alexander Bigga <[email protected]>, 2006 (c) mycable GmbH |
|
*/ |
|
|
|
/* |
|
* Date & Time support for STMicroelectronics M41T62 |
|
*/ |
|
|
|
/* #define DEBUG */ |
|
|
|
#include <common.h> |
|
#include <command.h> |
|
#include <rtc.h> |
|
#include <i2c.h> |
|
|
|
#define M41T62_REG_SSEC 0 |
|
#define M41T62_REG_SEC 1 |
|
#define M41T62_REG_MIN 2 |
|
#define M41T62_REG_HOUR 3 |
|
#define M41T62_REG_WDAY 4 |
|
#define M41T62_REG_DAY 5 |
|
#define M41T62_REG_MON 6 |
|
#define M41T62_REG_YEAR 7 |
|
#define M41T62_REG_ALARM_MON 0xa |
|
#define M41T62_REG_ALARM_DAY 0xb |
|
#define M41T62_REG_ALARM_HOUR 0xc |
|
#define M41T62_REG_ALARM_MIN 0xd |
|
#define M41T62_REG_ALARM_SEC 0xe |
|
#define M41T62_REG_FLAGS 0xf |
|
|
|
#define M41T62_DATETIME_REG_SIZE (M41T62_REG_YEAR + 1) |
|
#define M41T62_ALARM_REG_SIZE \ |
|
(M41T62_REG_ALARM_SEC + 1 - M41T62_REG_ALARM_MON) |
|
|
|
#define M41T62_SEC_ST (1 << 7) /* ST: Stop Bit */ |
|
#define M41T62_ALMON_AFE (1 << 7) /* AFE: AF Enable Bit */ |
|
#define M41T62_ALMON_SQWE (1 << 6) /* SQWE: SQW Enable Bit */ |
|
#define M41T62_ALHOUR_HT (1 << 6) /* HT: Halt Update Bit */ |
|
#define M41T62_FLAGS_AF (1 << 6) /* AF: Alarm Flag Bit */ |
|
#define M41T62_FLAGS_BATT_LOW (1 << 4) /* BL: Battery Low Bit */ |
|
|
|
#define M41T62_FEATURE_HT (1 << 0) |
|
#define M41T62_FEATURE_BL (1 << 1) |
|
|
|
#define M41T80_ALHOUR_HT (1 << 6) /* HT: Halt Update Bit */ |
|
|
|
int rtc_get(struct rtc_time *tm) |
|
{ |
|
u8 buf[M41T62_DATETIME_REG_SIZE]; |
|
|
|
i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE); |
|
|
|
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[M41T62_REG_SEC] & 0x7f); |
|
tm->tm_min = bcd2bin(buf[M41T62_REG_MIN] & 0x7f); |
|
tm->tm_hour = bcd2bin(buf[M41T62_REG_HOUR] & 0x3f); |
|
tm->tm_mday = bcd2bin(buf[M41T62_REG_DAY] & 0x3f); |
|
tm->tm_wday = buf[M41T62_REG_WDAY] & 0x07; |
|
tm->tm_mon = bcd2bin(buf[M41T62_REG_MON] & 0x1f); |
|
|
|
/* assume 20YY not 19YY, and ignore the Century Bit */ |
|
/* U-Boot needs to add 1900 here */ |
|
tm->tm_year = bcd2bin(buf[M41T62_REG_YEAR]) + 100 + 1900; |
|
|
|
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); |
|
|
|
return 0; |
|
} |
|
|
|
int rtc_set(struct rtc_time *tm) |
|
{ |
|
u8 buf[M41T62_DATETIME_REG_SIZE]; |
|
|
|
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); |
|
|
|
i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE); |
|
|
|
/* Merge time-data and register flags into buf[0..7] */ |
|
buf[M41T62_REG_SSEC] = 0; |
|
buf[M41T62_REG_SEC] = |
|
bin2bcd(tm->tm_sec) | (buf[M41T62_REG_SEC] & ~0x7f); |
|
buf[M41T62_REG_MIN] = |
|
bin2bcd(tm->tm_min) | (buf[M41T62_REG_MIN] & ~0x7f); |
|
buf[M41T62_REG_HOUR] = |
|
bin2bcd(tm->tm_hour) | (buf[M41T62_REG_HOUR] & ~0x3f) ; |
|
buf[M41T62_REG_WDAY] = |
|
(tm->tm_wday & 0x07) | (buf[M41T62_REG_WDAY] & ~0x07); |
|
buf[M41T62_REG_DAY] = |
|
bin2bcd(tm->tm_mday) | (buf[M41T62_REG_DAY] & ~0x3f); |
|
buf[M41T62_REG_MON] = |
|
bin2bcd(tm->tm_mon) | (buf[M41T62_REG_MON] & ~0x1f); |
|
/* assume 20YY not 19YY */ |
|
buf[M41T62_REG_YEAR] = bin2bcd(tm->tm_year % 100); |
|
|
|
if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE)) { |
|
printf("I2C write failed in %s()\n", __func__); |
|
return -1; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
void rtc_reset(void) |
|
{ |
|
u8 val; |
|
|
|
/* |
|
* M41T82: Make sure HT (Halt Update) bit is cleared. |
|
* This bit is 0 in M41T62 so its save to clear it always. |
|
*/ |
|
i2c_read(CONFIG_SYS_I2C_RTC_ADDR, M41T62_REG_ALARM_HOUR, 1, &val, 1); |
|
val &= ~M41T80_ALHOUR_HT; |
|
i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T62_REG_ALARM_HOUR, 1, &val, 1); |
|
}
|
|
|