With this driver, mainline Linux can keep its time and date in sync with the vendor kernel.
Advanced functionality like alarm and automatic power-on is not yet supported. Signed-off-by: Jonathan Neuschäfer <[email protected]> --- drivers/rtc/Kconfig | 4 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-ntxec.c | 115 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 120 insertions(+) create mode 100644 drivers/rtc/rtc-ntxec.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index b54d87d45c89b..2310d08933f9c 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -1300,6 +1300,10 @@ config RTC_DRV_CROS_EC This driver can also be built as a module. If so, the module will be called rtc-cros-ec. +config RTC_DRV_NTXEC + tristate "Netronix embedded controller RTC driver" + depends on MFD_NTXEC + comment "on-CPU RTC drivers" config RTC_DRV_ASM9260 diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 0721752c6ed4c..8653d04aefa99 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -111,6 +111,7 @@ obj-$(CONFIG_RTC_DRV_MT7622) += rtc-mt7622.o obj-$(CONFIG_RTC_DRV_MV) += rtc-mv.o obj-$(CONFIG_RTC_DRV_MXC) += rtc-mxc.o obj-$(CONFIG_RTC_DRV_MXC_V2) += rtc-mxc_v2.o +obj-$(CONFIG_RTC_DRV_NTXEC) += rtc-ntxec.o obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o obj-$(CONFIG_RTC_DRV_OPAL) += rtc-opal.o obj-$(CONFIG_RTC_DRV_PALMAS) += rtc-palmas.o diff --git a/drivers/rtc/rtc-ntxec.c b/drivers/rtc/rtc-ntxec.c new file mode 100644 index 0000000000000..44d5a5eedb597 --- /dev/null +++ b/drivers/rtc/rtc-ntxec.c @@ -0,0 +1,115 @@ +// SPDX-License-Identifier: GPL-2.0-only +// Copyright 2020 Jonathan Neuschäfer + +#include <linux/rtc.h> +#include <linux/mfd/ntxec.h> +#include <linux/platform_device.h> +#include <linux/types.h> +#include <linux/module.h> +#include <linux/of_device.h> + +struct ntxec_rtc { + struct device *dev; + struct ntxec *ec; +}; + +#define NTXEC_WRITE_YEAR 0x10 +#define NTXEC_WRITE_MONTH 0x11 +#define NTXEC_WRITE_DAY 0x12 +#define NTXEC_WRITE_HOUR 0x13 +#define NTXEC_WRITE_MINUTE 0x14 +#define NTXEC_WRITE_SECOND 0x15 + +#define NTXEC_READ_YM 0x20 +#define NTXEC_READ_DH 0x21 +#define NTXEC_READ_MS 0x22 + + +static int ntxec_read_time(struct device *dev, struct rtc_time *tm) +{ + struct ntxec_rtc *rtc = dev_get_drvdata(dev); + int res; + + res = ntxec_read16(rtc->ec, NTXEC_READ_YM); + if (res < 0) + return res; + + tm->tm_year = (res >> 8) + 100; + tm->tm_mon = (res & 0xff) - 1; + + res = ntxec_read16(rtc->ec, NTXEC_READ_DH); + if (res < 0) + return res; + + tm->tm_mday = res >> 8; + tm->tm_hour = res & 0xff; + + res = ntxec_read16(rtc->ec, NTXEC_READ_MS); + if (res < 0) + return res; + + tm->tm_min = res >> 8; + tm->tm_sec = res & 0xff; + + return 0; +} + +static int ntxec_set_time(struct device *dev, struct rtc_time *tm) +{ + struct ntxec_rtc *rtc = dev_get_drvdata(dev); + int res = 0; + + res |= ntxec_write8(rtc->ec, NTXEC_WRITE_YEAR, tm->tm_year - 100); + res |= ntxec_write8(rtc->ec, NTXEC_WRITE_MONTH, tm->tm_mon + 1); + res |= ntxec_write8(rtc->ec, NTXEC_WRITE_DAY, tm->tm_mday); + res |= ntxec_write8(rtc->ec, NTXEC_WRITE_HOUR, tm->tm_hour); + res |= ntxec_write8(rtc->ec, NTXEC_WRITE_MINUTE, tm->tm_min); + res |= ntxec_write8(rtc->ec, NTXEC_WRITE_SECOND, tm->tm_sec); + + return (res < 0)? -EIO : 0; +} + +static const struct rtc_class_ops ntxec_rtc_ops = { + .read_time = ntxec_read_time, + .set_time = ntxec_set_time, +}; + +static int ntxec_rtc_probe(struct platform_device *pdev) +{ + struct rtc_device *rtcdev; + struct ntxec_rtc *rtc; + + rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); + if (!rtc) + return -ENOMEM; + + rtc->dev = &pdev->dev; + rtc->ec = dev_get_drvdata(pdev->dev.parent); + platform_set_drvdata(pdev, rtc); + + rtcdev = devm_rtc_device_register(&pdev->dev, "ntxec-rtc", + &ntxec_rtc_ops, THIS_MODULE); + if (IS_ERR(rtcdev)) + return PTR_ERR(rtc); + + return 0; +} + +static const struct of_device_id ntxec_rtc_of_match[] = { + { .compatible = "netronix,ntxec-rtc" }, + { }, +}; +MODULE_DEVICE_TABLE(of, ntxec_rtc_of_match); + +static struct platform_driver ntxec_rtc_driver = { + .driver = { + .name = "ntxec-rtc", + .of_match_table = ntxec_rtc_of_match, + }, + .probe = ntxec_rtc_probe, +}; +module_platform_driver(ntxec_rtc_driver); + +MODULE_AUTHOR("Jonathan Neuschäfer <[email protected]>"); +MODULE_DESCRIPTION("RTC driver for Netronix EC"); +MODULE_LICENSE("GPL"); -- 2.27.0
