diff options
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/Kconfig | 6 | ||||
| -rw-r--r-- | drivers/rtc/m41t62.c | 112 |
2 files changed, 105 insertions, 13 deletions
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 6038b43230..fd0009b2e2 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -104,4 +104,10 @@ config RTC_MC146818 clock with a wide array of features and 50 bytes of general-purpose, battery-backed RAM. The driver supports access to the clock and RAM. +config RTC_M41T62 + bool "Enable M41T62 driver" + help + Enable driver for ST's M41T62 compatible RTC devices (like RV-4162). + It is a serial (I2C) real-time clock (RTC) with alarm. + endmenu diff --git a/drivers/rtc/m41t62.c b/drivers/rtc/m41t62.c index 137438389d..2ee7e00b02 100644 --- a/drivers/rtc/m41t62.c +++ b/drivers/rtc/m41t62.c @@ -1,5 +1,8 @@ // SPDX-License-Identifier: GPL-2.0+ /* + * (C) Copyright 2018 + * Lukasz Majewski, DENX Software Engineering, lukma@denx.de. + * * (C) Copyright 2008 * Stefan Roese, DENX Software Engineering, sr@denx.de. * @@ -15,6 +18,7 @@ #include <common.h> #include <command.h> +#include <dm.h> #include <rtc.h> #include <i2c.h> @@ -49,12 +53,8 @@ #define M41T80_ALHOUR_HT (1 << 6) /* HT: Halt Update Bit */ -int rtc_get(struct rtc_time *tm) +static void m41t62_update_rtc_time(struct rtc_time *tm, u8 *buf) { - u8 buf[M41T62_DATETIME_REG_SIZE]; - - i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE); - debug("%s: raw read data - sec=%02x, min=%02x, hr=%02x, " "mday=%02x, mon=%02x, year=%02x, wday=%02x, y2k=%02x\n", __FUNCTION__, @@ -77,20 +77,14 @@ int rtc_get(struct rtc_time *tm) __FUNCTION__, tm->tm_sec, tm->tm_min, tm->tm_hour, tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); - - return 0; } -int rtc_set(struct rtc_time *tm) +static void m41t62_set_rtc_buf(const struct rtc_time *tm, u8 *buf) { - u8 buf[M41T62_DATETIME_REG_SIZE]; - debug("Set 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); - i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE); - /* Merge time-data and register flags into buf[0..7] */ buf[M41T62_REG_SSEC] = 0; buf[M41T62_REG_SEC] = @@ -107,8 +101,99 @@ int rtc_set(struct rtc_time *tm) bin2bcd(tm->tm_mon) | (buf[M41T62_REG_MON] & ~0x1f); /* assume 20YY not 19YY */ buf[M41T62_REG_YEAR] = bin2bcd(tm->tm_year % 100); +} + +#ifdef CONFIG_DM_RTC +static int m41t62_rtc_get(struct udevice *dev, struct rtc_time *tm) +{ + u8 buf[M41T62_DATETIME_REG_SIZE]; + int ret; + + ret = dm_i2c_read(dev, 0, buf, sizeof(buf)); + if (ret) + return ret; + + m41t62_update_rtc_time(tm, buf); + + return 0; +} + +static int m41t62_rtc_set(struct udevice *dev, const struct rtc_time *tm) +{ + u8 buf[M41T62_DATETIME_REG_SIZE]; + int ret; + + ret = dm_i2c_read(dev, 0, buf, sizeof(buf)); + if (ret) + return ret; + + m41t62_set_rtc_buf(tm, buf); + + ret = dm_i2c_write(dev, 0, buf, sizeof(buf)); + if (ret) { + printf("I2C write failed in %s()\n", __func__); + return ret; + } + + return 0; +} + +static int m41t62_rtc_reset(struct udevice *dev) +{ + u8 val; + + /* + * M41T82: Make sure HT (Halt Update) bit is cleared. + * This bit is 0 in M41T62 so its save to clear it always. + */ + + int ret = dm_i2c_read(dev, M41T62_REG_ALARM_HOUR, &val, sizeof(val)); + + val &= ~M41T80_ALHOUR_HT; + ret |= dm_i2c_write(dev, M41T62_REG_ALARM_HOUR, &val, sizeof(val)); + + return ret; +} + +static const struct rtc_ops m41t62_rtc_ops = { + .get = m41t62_rtc_get, + .set = m41t62_rtc_set, + .reset = m41t62_rtc_reset, +}; + +static const struct udevice_id m41t62_rtc_ids[] = { + { .compatible = "st,m41t62" }, + { .compatible = "microcrystal,rv4162" }, + { } +}; + +U_BOOT_DRIVER(rtc_m41t62) = { + .name = "rtc-m41t62", + .id = UCLASS_RTC, + .of_match = m41t62_rtc_ids, + .ops = &m41t62_rtc_ops, +}; + +#else /* NON DM RTC code - will be removed */ +int rtc_get(struct rtc_time *tm) +{ + u8 buf[M41T62_DATETIME_REG_SIZE]; + + i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE); + m41t62_update_rtc_time(tm, buf); + + return 0; +} + +int rtc_set(struct rtc_time *tm) +{ + u8 buf[M41T62_DATETIME_REG_SIZE]; + + i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE); + m41t62_set_rtc_buf(tm, buf); - if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE)) { + if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, + M41T62_DATETIME_REG_SIZE)) { printf("I2C write failed in %s()\n", __func__); return -1; } @@ -128,3 +213,4 @@ void rtc_reset(void) val &= ~M41T80_ALHOUR_HT; i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T62_REG_ALARM_HOUR, 1, &val, 1); } +#endif /* CONFIG_DM_RTC */ |