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- /*
- * Copyright (C) 2016 by NXP Semiconductors Inc.
- * Date & Time support for PCF2127 RTC
- */
- /* #define DEBUG */
- #include <common.h>
- #include <command.h>
- #include <dm.h>
- #include <i2c.h>
- #include <log.h>
- #include <rtc.h>
- #define PCF2127_REG_CTRL1 0x00
- #define PCF2127_REG_CTRL2 0x01
- #define PCF2127_REG_CTRL3 0x02
- #define PCF2127_REG_SC 0x03
- #define PCF2127_REG_MN 0x04
- #define PCF2127_REG_HR 0x05
- #define PCF2127_REG_DM 0x06
- #define PCF2127_REG_DW 0x07
- #define PCF2127_REG_MO 0x08
- #define PCF2127_REG_YR 0x09
- static int pcf2127_rtc_read(struct udevice *dev, uint offset, u8 *buffer, uint len)
- {
- struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
- struct i2c_msg msg;
- int ret;
- /* Set the address of the start register to be read */
- ret = dm_i2c_write(dev, offset, NULL, 0);
- if (ret < 0)
- return ret;
- /* Read register's data */
- msg.addr = chip->chip_addr;
- msg.flags |= I2C_M_RD;
- msg.len = len;
- msg.buf = buffer;
- return dm_i2c_xfer(dev, &msg, 1);
- }
- static int pcf2127_rtc_write(struct udevice *dev, uint offset,
- const u8 *buffer, uint len)
- {
- return dm_i2c_write(dev, offset, buffer, len);
- }
- static int pcf2127_rtc_set(struct udevice *dev, const struct rtc_time *tm)
- {
- uchar buf[7] = {0};
- int i = 0, ret;
- /* hours, minutes and seconds */
- buf[i++] = bin2bcd(tm->tm_sec);
- buf[i++] = bin2bcd(tm->tm_min);
- buf[i++] = bin2bcd(tm->tm_hour);
- buf[i++] = bin2bcd(tm->tm_mday);
- buf[i++] = tm->tm_wday & 0x07;
- /* month, 1 - 12 */
- buf[i++] = bin2bcd(tm->tm_mon);
- /* year */
- buf[i++] = bin2bcd(tm->tm_year % 100);
- /* write register's data */
- ret = dm_i2c_write(dev, PCF2127_REG_SC, buf, i);
- return ret;
- }
- static int pcf2127_rtc_get(struct udevice *dev, struct rtc_time *tm)
- {
- int ret = 0;
- uchar buf[10] = { PCF2127_REG_CTRL1 };
- ret = pcf2127_rtc_read(dev, PCF2127_REG_CTRL1, buf, sizeof(buf));
- if (ret < 0)
- return ret;
- if (buf[PCF2127_REG_CTRL3] & 0x04)
- puts("### Warning: RTC Low Voltage - date/time not reliable\n");
- tm->tm_sec = bcd2bin(buf[PCF2127_REG_SC] & 0x7F);
- tm->tm_min = bcd2bin(buf[PCF2127_REG_MN] & 0x7F);
- tm->tm_hour = bcd2bin(buf[PCF2127_REG_HR] & 0x3F);
- tm->tm_mday = bcd2bin(buf[PCF2127_REG_DM] & 0x3F);
- tm->tm_mon = bcd2bin(buf[PCF2127_REG_MO] & 0x1F);
- tm->tm_year = bcd2bin(buf[PCF2127_REG_YR]) + 1900;
- if (tm->tm_year < 1970)
- tm->tm_year += 100; /* assume we are in 1970...2069 */
- tm->tm_wday = buf[PCF2127_REG_DW] & 0x07;
- tm->tm_yday = 0;
- tm->tm_isdst = 0;
- debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
- tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
- tm->tm_hour, tm->tm_min, tm->tm_sec);
- return ret;
- }
- static int pcf2127_rtc_reset(struct udevice *dev)
- {
- /*Doing nothing here*/
- return 0;
- }
- static const struct rtc_ops pcf2127_rtc_ops = {
- .get = pcf2127_rtc_get,
- .set = pcf2127_rtc_set,
- .reset = pcf2127_rtc_reset,
- .read = pcf2127_rtc_read,
- .write = pcf2127_rtc_write,
- };
- static const struct udevice_id pcf2127_rtc_ids[] = {
- { .compatible = "pcf2127-rtc" },
- { }
- };
- U_BOOT_DRIVER(rtc_pcf2127) = {
- .name = "rtc-pcf2127",
- .id = UCLASS_RTC,
- .of_match = pcf2127_rtc_ids,
- .ops = &pcf2127_rtc_ops,
- };
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