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>
177 lines
4.3 KiB
C
177 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2008
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* Tor Krill, Excito Elektronik i Skåne , tor@excito.com
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*
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* Modelled after the ds1337 driver
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*/
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/*
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* Date & Time support (no alarms) for Intersil
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* ISL1208 Real Time Clock (RTC).
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*/
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#include <common.h>
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#include <command.h>
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#include <dm.h>
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#include <rtc.h>
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#include <i2c.h>
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/*---------------------------------------------------------------------*/
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#ifdef DEBUG_RTC
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#define DEBUGR(fmt,args...) printf(fmt ,##args)
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#else
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#define DEBUGR(fmt,args...)
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#endif
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/*---------------------------------------------------------------------*/
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/*
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* RTC register addresses
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*/
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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_DATE_REG_ADDR 0x3
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#define RTC_MON_REG_ADDR 0x4
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#define RTC_YR_REG_ADDR 0x5
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#define RTC_DAY_REG_ADDR 0x6
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#define RTC_STAT_REG_ADDR 0x7
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/*
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* RTC control register bits
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*/
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/*
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* RTC status register bits
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*/
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#define RTC_STAT_BIT_ARST 0x80 /* AUTO RESET ENABLE BIT */
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#define RTC_STAT_BIT_XTOSCB 0x40 /* CRYSTAL OSCILLATOR ENABLE BIT */
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#define RTC_STAT_BIT_WRTC 0x10 /* WRITE RTC ENABLE BIT */
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#define RTC_STAT_BIT_ALM 0x04 /* ALARM BIT */
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#define RTC_STAT_BIT_BAT 0x02 /* BATTERY BIT */
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#define RTC_STAT_BIT_RTCF 0x01 /* REAL TIME CLOCK FAIL BIT */
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/*
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* Get the current time from the RTC
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*/
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static int isl1208_rtc_get(struct udevice *dev, struct rtc_time *tmp)
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{
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int ret;
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uchar buf[8], val;
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ret = dm_i2c_read(dev, 0, buf, sizeof(buf));
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if (ret < 0)
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return ret;
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if (buf[RTC_STAT_REG_ADDR] & RTC_STAT_BIT_RTCF) {
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printf ("### Warning: RTC oscillator has stopped\n");
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ret = dm_i2c_read(dev, RTC_STAT_REG_ADDR, &val, sizeof(val));
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if (ret < 0)
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return ret;
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val = val & ~(RTC_STAT_BIT_BAT | RTC_STAT_BIT_RTCF);
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ret = dm_i2c_write(dev, RTC_STAT_REG_ADDR, &val, sizeof(val));
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if (ret < 0)
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return ret;
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}
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tmp->tm_sec = bcd2bin(buf[RTC_SEC_REG_ADDR] & 0x7F);
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tmp->tm_min = bcd2bin(buf[RTC_MIN_REG_ADDR] & 0x7F);
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tmp->tm_hour = bcd2bin(buf[RTC_HR_REG_ADDR] & 0x3F);
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tmp->tm_mday = bcd2bin(buf[RTC_DATE_REG_ADDR] & 0x3F);
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tmp->tm_mon = bcd2bin(buf[RTC_MON_REG_ADDR] & 0x1F);
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tmp->tm_year = bcd2bin(buf[RTC_YR_REG_ADDR]) + 2000;
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tmp->tm_wday = bcd2bin(buf[RTC_DAY_REG_ADDR] & 0x07);
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tmp->tm_yday = 0;
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tmp->tm_isdst= 0;
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DEBUGR ("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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/*
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* Set the RTC
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*/
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static int isl1208_rtc_set(struct udevice *dev, const struct rtc_time *tmp)
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{
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int ret;
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uchar val, buf[7];
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DEBUGR ("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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if (tmp->tm_year < 2000 || tmp->tm_year > 2099)
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printf("WARNING: year should be between 2000 and 2099!\n");
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/* enable write */
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ret = dm_i2c_read(dev, RTC_STAT_REG_ADDR, &val, sizeof(val));
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if (ret < 0)
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return ret;
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val = val | RTC_STAT_BIT_WRTC;
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ret = dm_i2c_write(dev, RTC_STAT_REG_ADDR, &val, sizeof(val));
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if (ret < 0)
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return ret;
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buf[RTC_YR_REG_ADDR] = bin2bcd(tmp->tm_year % 100);
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buf[RTC_MON_REG_ADDR] = bin2bcd(tmp->tm_mon);
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buf[RTC_DAY_REG_ADDR] = bin2bcd(tmp->tm_wday);
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buf[RTC_DATE_REG_ADDR] = bin2bcd(tmp->tm_mday);
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buf[RTC_HR_REG_ADDR] = bin2bcd(tmp->tm_hour) | 0x80; /* 24h clock */
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buf[RTC_MIN_REG_ADDR] = bin2bcd(tmp->tm_min);
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buf[RTC_SEC_REG_ADDR] = bin2bcd(tmp->tm_sec);
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ret = dm_i2c_write(dev, 0, buf, sizeof(buf));
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if (ret < 0)
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return ret;
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/* disable write */
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ret = dm_i2c_read(dev, RTC_STAT_REG_ADDR, &val, sizeof(val));
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if (ret < 0)
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return ret;
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val = val & ~RTC_STAT_BIT_WRTC;
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ret = dm_i2c_write(dev, RTC_STAT_REG_ADDR, &val, sizeof(val));
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if (ret < 0)
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return ret;
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return 0;
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}
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static int isl1208_rtc_reset(struct udevice *dev)
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{
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return 0;
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}
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static int isl1208_probe(struct udevice *dev)
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{
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i2c_set_chip_flags(dev, DM_I2C_CHIP_RD_ADDRESS |
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DM_I2C_CHIP_WR_ADDRESS);
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return 0;
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}
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static const struct rtc_ops isl1208_rtc_ops = {
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.get = isl1208_rtc_get,
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.set = isl1208_rtc_set,
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.reset = isl1208_rtc_reset,
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};
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static const struct udevice_id isl1208_rtc_ids[] = {
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{ .compatible = "isil,isl1208" },
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{ }
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};
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U_BOOT_DRIVER(rtc_isl1208) = {
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.name = "rtc-isl1208",
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.id = UCLASS_RTC,
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.probe = isl1208_probe,
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.of_match = isl1208_rtc_ids,
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.ops = &isl1208_rtc_ops,
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};
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