diff options
| -rw-r--r-- | drivers/rtc/ds1337.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/drivers/rtc/ds1337.c b/drivers/rtc/ds1337.c index 9b31048e97..af94bcfdf4 100644 --- a/drivers/rtc/ds1337.c +++ b/drivers/rtc/ds1337.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0+ /* * (C) Copyright 2001-2008 + * Copyright 2020 NXP * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * Keith Outwater, keith_outwater@mvis.com` */ @@ -12,6 +13,7 @@ #include <common.h> #include <command.h> +#include <dm.h> #include <rtc.h> #include <i2c.h> @@ -60,6 +62,7 @@ #define RTC_STAT_BIT_OSF 0x80 /* Oscillator stop flag */ +#if !CONFIG_IS_ENABLED(DM_RTC) static uchar rtc_read (uchar reg); static void rtc_write (uchar reg, uchar val); @@ -188,3 +191,128 @@ static void rtc_write (uchar reg, uchar val) { i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val); } +#else +static uchar rtc_read(struct udevice *dev, uchar reg) +{ + return dm_i2c_reg_read(dev, reg); +} + +static void rtc_write(struct udevice *dev, uchar reg, uchar val) +{ + dm_i2c_reg_write(dev, reg, val); +} + +static int ds1337_rtc_get(struct udevice *dev, struct rtc_time *tmp) +{ + int rel = 0; + uchar sec, min, hour, mday, wday, mon_cent, year, control, status; + + control = rtc_read(dev, RTC_CTL_REG_ADDR); + status = rtc_read(dev, RTC_STAT_REG_ADDR); + sec = rtc_read(dev, RTC_SEC_REG_ADDR); + min = rtc_read(dev, RTC_MIN_REG_ADDR); + hour = rtc_read(dev, RTC_HR_REG_ADDR); + wday = rtc_read(dev, RTC_DAY_REG_ADDR); + mday = rtc_read(dev, RTC_DATE_REG_ADDR); + mon_cent = rtc_read(dev, RTC_MON_REG_ADDR); + year = rtc_read(dev, RTC_YR_REG_ADDR); + + /* No century bit, assume year 2000 */ +#ifdef CONFIG_RTC_DS1388 + mon_cent |= 0x80; +#endif + + debug("Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x\n", + year, mon_cent, mday, wday); + debug("hr: %02x min: %02x sec: %02x control: %02x status: %02x\n", + hour, min, sec, control, status); + + if (status & RTC_STAT_BIT_OSF) { + printf("### Warning: RTC oscillator has stopped\n"); + /* clear the OSF flag */ + rtc_write(dev, RTC_STAT_REG_ADDR, + rtc_read(dev, RTC_STAT_REG_ADDR) & ~RTC_STAT_BIT_OSF); + rel = -1; + } + + tmp->tm_sec = bcd2bin(sec & 0x7F); + tmp->tm_min = bcd2bin(min & 0x7F); + tmp->tm_hour = bcd2bin(hour & 0x3F); + tmp->tm_mday = bcd2bin(mday & 0x3F); + tmp->tm_mon = bcd2bin(mon_cent & 0x1F); + tmp->tm_year = bcd2bin(year) + ((mon_cent & 0x80) ? 2000 : 1900); + tmp->tm_wday = bcd2bin((wday - 1) & 0x07); + tmp->tm_yday = 0; + tmp->tm_isdst = 0; + + debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", + tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, + tmp->tm_hour, tmp->tm_min, tmp->tm_sec); + + return rel; +} + +static int ds1337_rtc_set(struct udevice *dev, const struct rtc_time *tmp) +{ + uchar century; + + debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", + tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, + tmp->tm_hour, tmp->tm_min, tmp->tm_sec); + + rtc_write(dev, RTC_YR_REG_ADDR, bin2bcd(tmp->tm_year % 100)); + + century = (tmp->tm_year >= 2000) ? 0x80 : 0; + rtc_write(dev, RTC_MON_REG_ADDR, bin2bcd(tmp->tm_mon) | century); + + rtc_write(dev, RTC_DAY_REG_ADDR, bin2bcd(tmp->tm_wday + 1)); + rtc_write(dev, RTC_DATE_REG_ADDR, bin2bcd(tmp->tm_mday)); + rtc_write(dev, RTC_HR_REG_ADDR, bin2bcd(tmp->tm_hour)); + rtc_write(dev, RTC_MIN_REG_ADDR, bin2bcd(tmp->tm_min)); + rtc_write(dev, RTC_SEC_REG_ADDR, bin2bcd(tmp->tm_sec)); + + return 0; +} + +#ifdef CONFIG_RTC_DS1337_NOOSC + #define RTC_DS1337_RESET_VAL \ + (RTC_CTL_BIT_INTCN | RTC_CTL_BIT_RS1 | RTC_CTL_BIT_RS2) +#else + #define RTC_DS1337_RESET_VAL (RTC_CTL_BIT_RS1 | RTC_CTL_BIT_RS2) +#endif +static int ds1337_rtc_reset(struct udevice *dev) +{ +#ifdef CONFIG_RTC_DS1337 + rtc_write(dev, RTC_CTL_REG_ADDR, RTC_DS1337_RESET_VAL); +#elif defined CONFIG_RTC_DS1388 + rtc_write(dev, RTC_CTL_REG_ADDR, 0x0); /* hw default */ +#endif +#ifdef CONFIG_RTC_DS1339_TCR_VAL + rtc_write(dev, RTC_TC_REG_ADDR, CONFIG_RTC_DS1339_TCR_VAL); +#endif +#ifdef CONFIG_RTC_DS1388_TCR_VAL + rtc_write(dev, RTC_TC_REG_ADDR, CONFIG_RTC_DS1388_TCR_VAL); +#endif + return 0; +} + +static const struct rtc_ops ds1337_rtc_ops = { + .get = ds1337_rtc_get, + .set = ds1337_rtc_set, + .reset = ds1337_rtc_reset, +}; + +static const struct udevice_id ds1337_rtc_ids[] = { + { .compatible = "ds1337" }, + { .compatible = "ds1338" }, + { .compatible = "ds1338" }, + { } +}; + +U_BOOT_DRIVER(rtc_ds1337) = { + .name = "rtc-ds1337", + .id = UCLASS_RTC, + .of_match = ds1337_rtc_ids, + .ops = &ds1337_rtc_ops, +}; +#endif |