mirror of
https://github.com/brain-hackers/u-boot-brain
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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>
128 lines
3.8 KiB
C
128 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2010 Freescale Semiconductor, Inc.
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*
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* Author: Priyanka Jain <Priyanka.Jain@freescale.com>
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*/
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/*
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* This file provides Date & Time support (no alarms) for PT7C4338 chip.
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*
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* This file is based on drivers/rtc/ds1337.c
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*
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* PT7C4338 chip is manufactured by Pericom Technology Inc.
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* It is a serial real-time clock which provides
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* 1)Low-power clock/calendar.
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* 2)Programmable square-wave output.
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* It has 56 bytes of nonvolatile RAM.
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*/
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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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/* RTC register addresses */
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#define RTC_SEC_REG_ADDR 0x0
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#define RTC_MIN_REG_ADDR 0x1
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#define RTC_HR_REG_ADDR 0x2
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#define RTC_DAY_REG_ADDR 0x3
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#define RTC_DATE_REG_ADDR 0x4
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#define RTC_MON_REG_ADDR 0x5
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#define RTC_YR_REG_ADDR 0x6
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#define RTC_CTL_STAT_REG_ADDR 0x7
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/* RTC second register address bit */
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#define RTC_SEC_BIT_CH 0x80 /* Clock Halt (in Register 0) */
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/* RTC control and status register bits */
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#define RTC_CTL_STAT_BIT_RS0 0x1 /* Rate select 0 */
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#define RTC_CTL_STAT_BIT_RS1 0x2 /* Rate select 1 */
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#define RTC_CTL_STAT_BIT_SQWE 0x10 /* Square Wave Enable */
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#define RTC_CTL_STAT_BIT_OSF 0x20 /* Oscillator Stop Flag */
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#define RTC_CTL_STAT_BIT_OUT 0x80 /* Output Level Control */
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/* RTC reset value */
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#define RTC_PT7C4338_RESET_VAL \
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(RTC_CTL_STAT_BIT_RS0 | RTC_CTL_STAT_BIT_RS1 | RTC_CTL_STAT_BIT_OUT)
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/****** Helper functions ****************************************/
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static u8 rtc_read(u8 reg)
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{
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return i2c_reg_read(CONFIG_SYS_I2C_RTC_ADDR, reg);
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}
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static void rtc_write(u8 reg, u8 val)
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{
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i2c_reg_write(CONFIG_SYS_I2C_RTC_ADDR, reg, val);
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}
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/****************************************************************/
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/* Get the current time from the RTC */
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int rtc_get(struct rtc_time *tmp)
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{
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int ret = 0;
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u8 sec, min, hour, mday, wday, mon, year, ctl_stat;
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ctl_stat = rtc_read(RTC_CTL_STAT_REG_ADDR);
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sec = rtc_read(RTC_SEC_REG_ADDR);
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min = rtc_read(RTC_MIN_REG_ADDR);
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hour = rtc_read(RTC_HR_REG_ADDR);
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wday = rtc_read(RTC_DAY_REG_ADDR);
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mday = rtc_read(RTC_DATE_REG_ADDR);
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mon = rtc_read(RTC_MON_REG_ADDR);
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year = rtc_read(RTC_YR_REG_ADDR);
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debug("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
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"hr: %02x min: %02x sec: %02x control_status: %02x\n",
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year, mon, mday, wday, hour, min, sec, ctl_stat);
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if (ctl_stat & RTC_CTL_STAT_BIT_OSF) {
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printf("### Warning: RTC oscillator has stopped\n");
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/* clear the OSF flag */
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rtc_write(RTC_CTL_STAT_REG_ADDR,
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rtc_read(RTC_CTL_STAT_REG_ADDR)\
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& ~RTC_CTL_STAT_BIT_OSF);
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ret = -1;
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}
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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(mday & 0x3F);
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tmp->tm_mon = bcd2bin(mon & 0x1F);
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tmp->tm_year = bcd2bin(year) + 2000;
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tmp->tm_wday = bcd2bin((wday - 1) & 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 ret;
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}
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/* Set the RTC */
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int rtc_set(struct rtc_time *tmp)
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{
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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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rtc_write(RTC_YR_REG_ADDR, bin2bcd(tmp->tm_year % 100));
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rtc_write(RTC_MON_REG_ADDR, bin2bcd(tmp->tm_mon));
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rtc_write(RTC_DAY_REG_ADDR, bin2bcd(tmp->tm_wday + 1));
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rtc_write(RTC_DATE_REG_ADDR, bin2bcd(tmp->tm_mday));
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rtc_write(RTC_HR_REG_ADDR, bin2bcd(tmp->tm_hour));
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rtc_write(RTC_MIN_REG_ADDR, bin2bcd(tmp->tm_min));
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rtc_write(RTC_SEC_REG_ADDR, bin2bcd(tmp->tm_sec));
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return 0;
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}
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/* Reset the RTC */
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void rtc_reset(void)
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{
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rtc_write(RTC_SEC_REG_ADDR, 0x00); /* clearing Clock Halt */
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rtc_write(RTC_CTL_STAT_REG_ADDR, RTC_PT7C4338_RESET_VAL);
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}
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