mirror of
https://github.com/AsahiLinux/u-boot
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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>
139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2001
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* Erik Theisen, Wave 7 Optics, etheisen@mindspring.com.
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*/
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/*
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* Date & Time support for ST Electronics M48T35Ax RTC
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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 <config.h>
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#if defined(CONFIG_CMD_DATE)
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static uchar rtc_read (uchar reg);
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static void rtc_write (uchar reg, uchar val);
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/* ------------------------------------------------------------------------- */
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int rtc_get (struct rtc_time *tmp)
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{
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uchar sec, min, hour, cent_day, date, month, year;
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uchar ccr; /* Clock control register */
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/* Lock RTC for read using clock control register */
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ccr = rtc_read(0);
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ccr = ccr | 0x40;
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rtc_write(0, ccr);
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sec = rtc_read (0x1);
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min = rtc_read (0x2);
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hour = rtc_read (0x3);
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cent_day= rtc_read (0x4);
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date = rtc_read (0x5);
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month = rtc_read (0x6);
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year = rtc_read (0x7);
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/* UNLock RTC */
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ccr = rtc_read(0);
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ccr = ccr & 0xBF;
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rtc_write(0, ccr);
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debug ( "Get RTC year: %02x month: %02x date: %02x cent_day: %02x "
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"hr: %02x min: %02x sec: %02x\n",
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year, month, date, cent_day,
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hour, min, sec );
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tmp->tm_sec = bcd2bin (sec & 0x7F);
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tmp->tm_min = bcd2bin (min & 0x7F);
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tmp->tm_hour = bcd2bin (hour & 0x3F);
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tmp->tm_mday = bcd2bin (date & 0x3F);
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tmp->tm_mon = bcd2bin (month & 0x1F);
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tmp->tm_year = bcd2bin (year) + ((cent_day & 0x10) ? 2000 : 1900);
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tmp->tm_wday = bcd2bin (cent_day & 0x07);
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tmp->tm_yday = 0;
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tmp->tm_isdst= 0;
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debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
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return 0;
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}
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int rtc_set (struct rtc_time *tmp)
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{
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uchar ccr; /* Clock control register */
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uchar century;
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debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
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/* Lock RTC for write using clock control register */
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ccr = rtc_read(0);
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ccr = ccr | 0x80;
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rtc_write(0, ccr);
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rtc_write (0x07, bin2bcd(tmp->tm_year % 100));
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rtc_write (0x06, bin2bcd(tmp->tm_mon));
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rtc_write (0x05, bin2bcd(tmp->tm_mday));
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century = ((tmp->tm_year >= 2000) ? 0x10 : 0) | 0x20;
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rtc_write (0x04, bin2bcd(tmp->tm_wday) | century);
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rtc_write (0x03, bin2bcd(tmp->tm_hour));
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rtc_write (0x02, bin2bcd(tmp->tm_min ));
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rtc_write (0x01, bin2bcd(tmp->tm_sec ));
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/* UNLock RTC */
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ccr = rtc_read(0);
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ccr = ccr & 0x7F;
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rtc_write(0, ccr);
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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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uchar val;
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/* Clear all clock control registers */
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rtc_write (0x0, 0x80); /* No Read Lock or calibration */
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/* Clear stop bit */
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val = rtc_read (0x1);
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val &= 0x7f;
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rtc_write(0x1, val);
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/* Enable century / disable frequency test */
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val = rtc_read (0x4);
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val = (val & 0xBF) | 0x20;
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rtc_write(0x4, val);
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/* Clear write lock */
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rtc_write(0x0, 0);
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}
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/* ------------------------------------------------------------------------- */
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static uchar rtc_read (uchar reg)
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{
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return *(unsigned char *)
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((CONFIG_SYS_NVRAM_BASE_ADDR + CONFIG_SYS_NVRAM_SIZE - 8) + reg);
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}
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static void rtc_write (uchar reg, uchar val)
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{
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*(unsigned char *)
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((CONFIG_SYS_NVRAM_BASE_ADDR + CONFIG_SYS_NVRAM_SIZE - 8) + reg) = val;
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}
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#endif
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