ef6c26d338
The previous pcf2127 RTC chip could not read and set the correct time. When reading the data of internal registers, the read address was the value of register plus 1. This is because this chip requires the host to send a stop signal after setting the register address and before reading the register data. This patch sets the register address using dm_i2c_write and reads the register data using the original dm_i2c_xfer in order to generate a stop signal after the register address is set, and fixes the bug of the original read and write time. Signed-off-by: Biwen Li <biwen.li@nxp.com> Signed-off-by: Chuanhua Han <chuanhua.han@nxp.com> Reviewed-by: Lukasz Majewski <lukma@denx.de> Reviewed-by: Heiko Schocher <hs@denx.de>
125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
/*
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* Copyright (C) 2016 by NXP Semiconductors Inc.
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* Date & Time support for PCF2127 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 <dm.h>
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#include <i2c.h>
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#include <rtc.h>
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#define PCF2127_REG_CTRL1 0x00
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#define PCF2127_REG_CTRL2 0x01
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#define PCF2127_REG_CTRL3 0x02
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#define PCF2127_REG_SC 0x03
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#define PCF2127_REG_MN 0x04
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#define PCF2127_REG_HR 0x05
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#define PCF2127_REG_DM 0x06
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#define PCF2127_REG_DW 0x07
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#define PCF2127_REG_MO 0x08
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#define PCF2127_REG_YR 0x09
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static int pcf2127_read_reg(struct udevice *dev, uint offset,
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u8 *buffer, int len)
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{
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struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
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struct i2c_msg msg;
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int ret;
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/* Set the address of the start register to be read */
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ret = dm_i2c_write(dev, offset, NULL, 0);
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if (ret < 0)
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return ret;
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/* Read register's data */
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msg.addr = chip->chip_addr;
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msg.flags |= I2C_M_RD;
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msg.len = len;
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msg.buf = buffer;
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return dm_i2c_xfer(dev, &msg, 1);
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}
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static int pcf2127_rtc_set(struct udevice *dev, const struct rtc_time *tm)
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{
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uchar buf[7] = {0};
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int i = 0, ret;
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/* hours, minutes and seconds */
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buf[i++] = bin2bcd(tm->tm_sec);
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buf[i++] = bin2bcd(tm->tm_min);
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buf[i++] = bin2bcd(tm->tm_hour);
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buf[i++] = bin2bcd(tm->tm_mday);
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buf[i++] = tm->tm_wday & 0x07;
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/* month, 1 - 12 */
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buf[i++] = bin2bcd(tm->tm_mon + 1);
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/* year */
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buf[i++] = bin2bcd(tm->tm_year % 100);
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/* write register's data */
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ret = dm_i2c_write(dev, PCF2127_REG_SC, buf, i);
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return ret;
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}
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static int pcf2127_rtc_get(struct udevice *dev, struct rtc_time *tm)
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{
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int ret = 0;
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uchar buf[10] = { PCF2127_REG_CTRL1 };
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ret = pcf2127_read_reg(dev, PCF2127_REG_CTRL1, buf, sizeof(buf));
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if (ret < 0)
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return ret;
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if (buf[PCF2127_REG_CTRL3] & 0x04)
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puts("### Warning: RTC Low Voltage - date/time not reliable\n");
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tm->tm_sec = bcd2bin(buf[PCF2127_REG_SC] & 0x7F);
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tm->tm_min = bcd2bin(buf[PCF2127_REG_MN] & 0x7F);
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tm->tm_hour = bcd2bin(buf[PCF2127_REG_HR] & 0x3F);
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tm->tm_mday = bcd2bin(buf[PCF2127_REG_DM] & 0x3F);
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tm->tm_mon = bcd2bin(buf[PCF2127_REG_MO] & 0x1F) - 1;
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tm->tm_year = bcd2bin(buf[PCF2127_REG_YR]) + 1900;
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if (tm->tm_year < 1970)
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tm->tm_year += 100; /* assume we are in 1970...2069 */
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tm->tm_wday = buf[PCF2127_REG_DW] & 0x07;
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tm->tm_yday = 0;
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tm->tm_isdst = 0;
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debug("Get 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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return ret;
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}
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static int pcf2127_rtc_reset(struct udevice *dev)
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{
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/*Doing nothing here*/
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return 0;
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}
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static const struct rtc_ops pcf2127_rtc_ops = {
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.get = pcf2127_rtc_get,
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.set = pcf2127_rtc_set,
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.reset = pcf2127_rtc_reset,
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};
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static const struct udevice_id pcf2127_rtc_ids[] = {
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{ .compatible = "pcf2127-rtc" },
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{ }
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};
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U_BOOT_DRIVER(rtc_pcf2127) = {
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.name = "rtc-pcf2127",
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.id = UCLASS_RTC,
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.of_match = pcf2127_rtc_ids,
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.ops = &pcf2127_rtc_ops,
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};
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