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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
134 lines
3.9 KiB
C
134 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2008
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* Stefan Roese, DENX Software Engineering, sr@denx.de.
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*
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* based on a the Linux rtc-m41t80.c driver which is:
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* Alexander Bigga <ab@mycable.de>, 2006 (c) mycable GmbH
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*/
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/*
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* Date & Time support for STMicroelectronics M41T62
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*/
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/* #define DEBUG */
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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_CMD_DATE)
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#define M41T62_REG_SSEC 0
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#define M41T62_REG_SEC 1
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#define M41T62_REG_MIN 2
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#define M41T62_REG_HOUR 3
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#define M41T62_REG_WDAY 4
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#define M41T62_REG_DAY 5
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#define M41T62_REG_MON 6
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#define M41T62_REG_YEAR 7
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#define M41T62_REG_ALARM_MON 0xa
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#define M41T62_REG_ALARM_DAY 0xb
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#define M41T62_REG_ALARM_HOUR 0xc
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#define M41T62_REG_ALARM_MIN 0xd
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#define M41T62_REG_ALARM_SEC 0xe
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#define M41T62_REG_FLAGS 0xf
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#define M41T62_DATETIME_REG_SIZE (M41T62_REG_YEAR + 1)
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#define M41T62_ALARM_REG_SIZE \
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(M41T62_REG_ALARM_SEC + 1 - M41T62_REG_ALARM_MON)
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#define M41T62_SEC_ST (1 << 7) /* ST: Stop Bit */
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#define M41T62_ALMON_AFE (1 << 7) /* AFE: AF Enable Bit */
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#define M41T62_ALMON_SQWE (1 << 6) /* SQWE: SQW Enable Bit */
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#define M41T62_ALHOUR_HT (1 << 6) /* HT: Halt Update Bit */
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#define M41T62_FLAGS_AF (1 << 6) /* AF: Alarm Flag Bit */
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#define M41T62_FLAGS_BATT_LOW (1 << 4) /* BL: Battery Low Bit */
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#define M41T62_FEATURE_HT (1 << 0)
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#define M41T62_FEATURE_BL (1 << 1)
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#define M41T80_ALHOUR_HT (1 << 6) /* HT: Halt Update Bit */
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int rtc_get(struct rtc_time *tm)
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{
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u8 buf[M41T62_DATETIME_REG_SIZE];
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i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE);
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debug("%s: raw read data - sec=%02x, min=%02x, hr=%02x, "
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"mday=%02x, mon=%02x, year=%02x, wday=%02x, y2k=%02x\n",
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__FUNCTION__,
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buf[0], buf[1], buf[2], buf[3],
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buf[4], buf[5], buf[6], buf[7]);
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tm->tm_sec = bcd2bin(buf[M41T62_REG_SEC] & 0x7f);
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tm->tm_min = bcd2bin(buf[M41T62_REG_MIN] & 0x7f);
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tm->tm_hour = bcd2bin(buf[M41T62_REG_HOUR] & 0x3f);
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tm->tm_mday = bcd2bin(buf[M41T62_REG_DAY] & 0x3f);
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tm->tm_wday = buf[M41T62_REG_WDAY] & 0x07;
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tm->tm_mon = bcd2bin(buf[M41T62_REG_MON] & 0x1f);
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/* assume 20YY not 19YY, and ignore the Century Bit */
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/* U-Boot needs to add 1900 here */
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tm->tm_year = bcd2bin(buf[M41T62_REG_YEAR]) + 100 + 1900;
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debug("%s: tm is secs=%d, mins=%d, hours=%d, "
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"mday=%d, mon=%d, year=%d, wday=%d\n",
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__FUNCTION__,
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tm->tm_sec, tm->tm_min, tm->tm_hour,
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tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
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return 0;
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}
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int rtc_set(struct rtc_time *tm)
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{
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u8 buf[M41T62_DATETIME_REG_SIZE];
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debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
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tm->tm_hour, tm->tm_min, tm->tm_sec);
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i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE);
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/* Merge time-data and register flags into buf[0..7] */
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buf[M41T62_REG_SSEC] = 0;
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buf[M41T62_REG_SEC] =
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bin2bcd(tm->tm_sec) | (buf[M41T62_REG_SEC] & ~0x7f);
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buf[M41T62_REG_MIN] =
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bin2bcd(tm->tm_min) | (buf[M41T62_REG_MIN] & ~0x7f);
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buf[M41T62_REG_HOUR] =
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bin2bcd(tm->tm_hour) | (buf[M41T62_REG_HOUR] & ~0x3f) ;
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buf[M41T62_REG_WDAY] =
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(tm->tm_wday & 0x07) | (buf[M41T62_REG_WDAY] & ~0x07);
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buf[M41T62_REG_DAY] =
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bin2bcd(tm->tm_mday) | (buf[M41T62_REG_DAY] & ~0x3f);
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buf[M41T62_REG_MON] =
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bin2bcd(tm->tm_mon) | (buf[M41T62_REG_MON] & ~0x1f);
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/* assume 20YY not 19YY */
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buf[M41T62_REG_YEAR] = bin2bcd(tm->tm_year % 100);
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if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE)) {
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printf("I2C write failed in %s()\n", __func__);
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return -1;
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}
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return 0;
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}
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void rtc_reset(void)
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{
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u8 val;
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/*
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* M41T82: Make sure HT (Halt Update) bit is cleared.
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* This bit is 0 in M41T62 so its save to clear it always.
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*/
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i2c_read(CONFIG_SYS_I2C_RTC_ADDR, M41T62_REG_ALARM_HOUR, 1, &val, 1);
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val &= ~M41T80_ALHOUR_HT;
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i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T62_REG_ALARM_HOUR, 1, &val, 1);
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}
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#endif
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