Read and writes the time to the non-battery backed RTC in the ASPEED BMC system on chip families. Signed-off-by: Joel Stanley <joel@xxxxxxxxx> --- v2: Address review from Alexandre - Use devm_rtc_allocate_device - Fill in range_min - Direcly fill in tm struct - Return EINVAL when RTC is not enabled v1: https://lore.kernel.org/linux-arm-kernel/20181003133155.27494-2-joel@xxxxxxxxx/ Signed-off-by: Joel Stanley <joel@xxxxxxxxx> --- drivers/rtc/Kconfig | 10 +++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-aspeed.c | 152 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 163 insertions(+) create mode 100644 drivers/rtc/rtc-aspeed.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index dc0d66e80038..2d0482bc468b 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -1841,6 +1841,16 @@ config RTC_DRV_RTD119X If you say yes here, you get support for the RTD1295 SoC Real Time Clock. +config RTC_DRV_ASPEED + tristate "Aspeed RTC" + depends on ARCH_ASPEED || COMPILE_TEST + help + If you say yes here you get support for the ASPEED AST2400 and + AST2500 SoC real time clocks. + + This driver can also be built as a module, if so, the module + will be called "rtc-aspeed". + comment "HID Sensor RTC drivers" config RTC_DRV_HID_SENSOR_TIME diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index fe3962496685..9d997faa2c26 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -34,6 +34,7 @@ obj-$(CONFIG_RTC_DRV_AC100) += rtc-ac100.o obj-$(CONFIG_RTC_DRV_ARMADA38X) += rtc-armada38x.o obj-$(CONFIG_RTC_DRV_AS3722) += rtc-as3722.o obj-$(CONFIG_RTC_DRV_ASM9260) += rtc-asm9260.o +obj-$(CONFIG_RTC_DRV_ASPEED) += rtc-aspeed.o obj-$(CONFIG_RTC_DRV_AT91RM9200)+= rtc-at91rm9200.o obj-$(CONFIG_RTC_DRV_AT91SAM9) += rtc-at91sam9.o obj-$(CONFIG_RTC_DRV_AU1XXX) += rtc-au1xxx.o diff --git a/drivers/rtc/rtc-aspeed.c b/drivers/rtc/rtc-aspeed.c new file mode 100644 index 000000000000..9ddb3121b30d --- /dev/null +++ b/drivers/rtc/rtc-aspeed.c @@ -0,0 +1,152 @@ +// SPDX-License-Identifier: GPL-2.0+ +// Copyright 2015 IBM Corp. + +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/rtc.h> +#include <linux/io.h> + +struct aspeed_rtc { + struct rtc_device *rtc_dev; + void __iomem *base; + spinlock_t lock; +}; + +#define RTC_TIME 0x00 +#define RTC_YEAR 0x04 +#define RTC_CTRL 0x10 + +#define RTC_UNLOCK BIT(1) +#define RTC_ENABLE BIT(0) + +static int aspeed_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct aspeed_rtc *rtc = dev_get_drvdata(dev); + unsigned int cent, year; + unsigned long flags; + u32 reg1, reg2; + + spin_lock_irqsave(&rtc->lock, flags); + + if (!(readl(rtc->base + RTC_CTRL) & RTC_ENABLE)) { + spin_unlock_irqrestore(&rtc->lock, flags); + dev_dbg(dev, "%s failing as rtc disabled\n", __func__); + return -EINVAL; + } + + do { + reg2 = readl(rtc->base + RTC_YEAR); + reg1 = readl(rtc->base + RTC_TIME); + } while (reg2 != readl(rtc->base + RTC_YEAR)); + + tm->tm_mday = (reg1 >> 24) & 0x1f; + tm->tm_hour = (reg1 >> 16) & 0x1f; + tm->tm_min = (reg1 >> 8) & 0x3f; + tm->tm_sec = (reg1 >> 0) & 0x3f; + + cent = (reg2 >> 16) & 0x1f; + year = (reg2 >> 8) & 0x7f; + tm->tm_mon = ((reg2 >> 0) & 0x0f) - 1; + tm->tm_year = year + (cent * 100) - 1900; + + dev_dbg(dev, "%s: %4d-%02d-%02d %02d:%02d:%02d\n", __func__, + 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday, + tm->tm_hour, tm->tm_min, tm->tm_sec); + + spin_unlock_irqrestore(&rtc->lock, flags); + + return 0; +} + +static int aspeed_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct aspeed_rtc *rtc = dev_get_drvdata(dev); + unsigned long flags; + u32 reg1, reg2, ctrl; + int year, cent; + + cent = (tm->tm_year + 1900) / 100; + year = tm->tm_year % 100; + + reg1 = (tm->tm_mday << 24) | (tm->tm_hour << 16) | (tm->tm_min << 8) | + tm->tm_sec; + + reg2 = ((cent & 0x1f) << 16) | ((year & 0x7f) << 8) | + ((tm->tm_mon + 1) & 0xf); + + spin_lock_irqsave(&rtc->lock, flags); + + ctrl = readl(rtc->base + RTC_CTRL); + writel(ctrl | RTC_UNLOCK, rtc->base + RTC_CTRL); + + writel(reg1, rtc->base + RTC_TIME); + writel(reg2, rtc->base + RTC_YEAR); + + /* Re-lock and ensure enable is set now that a time is programmed */ + writel(ctrl | RTC_ENABLE, rtc->base + RTC_CTRL); + + spin_unlock_irqrestore(&rtc->lock, flags); + + return 0; +} + +static const struct rtc_class_ops aspeed_rtc_ops = { + .read_time = aspeed_rtc_read_time, + .set_time = aspeed_rtc_set_time, +}; + +static int aspeed_rtc_probe(struct platform_device *pdev) +{ + struct aspeed_rtc *rtc; + struct resource *res; + int ret; + + rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); + if (!rtc) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + rtc->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(rtc->base)) + return PTR_ERR(rtc->base); + + rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev); + if (IS_ERR(rtc->rtc_dev)) + return PTR_ERR(rtc->rtc_dev); + + platform_set_drvdata(pdev, rtc); + + rtc->rtc_dev->ops = &aspeed_rtc_ops; + rtc->rtc_dev->range_min = RTC_TIMESTAMP_BEGIN_1900; + rtc->rtc_dev->range_max = 38814989399LL; /* 3199-12-31 23:59:59 */ + + ret = rtc_register_device(rtc->rtc_dev); + if (ret) + return ret; + + spin_lock_init(&rtc->lock); + + return 0; +} + +static const struct of_device_id aspeed_rtc_match[] = { + { .compatible = "aspeed,ast2400-rtc", }, + { .compatible = "aspeed,ast2500-rtc", }, + { .compatible = "aspeed,ast2600-rtc", }, + {} +}; +MODULE_DEVICE_TABLE(of, aspeed_rtc_match); + +static struct platform_driver aspeed_rtc_driver = { + .driver = { + .name = "aspeed-rtc", + .of_match_table = of_match_ptr(aspeed_rtc_match), + }, +}; + +module_platform_driver_probe(aspeed_rtc_driver, aspeed_rtc_probe); + +MODULE_DESCRIPTION("ASPEED RTC driver"); +MODULE_AUTHOR("Joel Stanley <joel@xxxxxxxxx>"); +MODULE_LICENSE("GPL"); -- 2.20.1
