Read and writes the time to the non-battery backed RTC in the ASPEED
AST2400 and AST2500 system on chip.
Signed-off-by: Joel Stanley <joel@xxxxxxxxx>
---
drivers/rtc/Kconfig | 10 +++
drivers/rtc/Makefile | 1 +
drivers/rtc/rtc-aspeed.c | 142 +++++++++++++++++++++++++++++++++++++++
3 files changed, 153 insertions(+)
create mode 100644 drivers/rtc/rtc-aspeed.c
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index a819ef07b7ec..372944b59b69 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1783,6 +1783,16 @@ 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 290c1730fb0a..7d924577d133 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -33,6 +33,7 @@ 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..dce00e594910
--- /dev/null
+++ b/drivers/rtc/rtc-aspeed.c
@@ -0,0 +1,142 @@
+// 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 0x02
+#define RTC_ENABLE 0x01
+
+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, mon, day, hour, min, sec;
+ unsigned long flags;
+ u32 reg1, reg2;
+
+ spin_lock_irqsave(&rtc->lock, flags);
+
+ do {
+ reg2 = readl(rtc->base + RTC_YEAR);
+ reg1 = readl(rtc->base + RTC_TIME);
+ } while (reg2 != readl(rtc->base + RTC_YEAR));
+
+ day = (reg1 >> 24) & 0x1f;
+ hour = (reg1 >> 16) & 0x1f;
+ min = (reg1 >> 8) & 0x3f;
+ sec = (reg1 >> 0) & 0x3f;
+ cent = (reg2 >> 16) & 0x1f;
+ year = (reg2 >> 8) & 0x7f;
+ /*
+ * Month is 1-12 in hardware, and 0-11 in struct rtc_time, however we
+ * are using mktime64 which is 1-12, so no adjustment is necessary
+ */
+ mon = (reg2 >> 0) & 0x0f;
+
+ rtc_time64_to_tm(mktime64(cent * 100 + year, mon, day, hour, min, sec),
+ tm);
+
+ 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;
+
+ spin_lock_irqsave(&rtc->lock, flags);
+
+ 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;
+
+ /* Hardware is 1-12, convert to 0-11 */
+ reg2 = ((cent & 0x1f) << 16) | ((year & 0x7f) << 8) |
+ ((tm->tm_mon & 0xf) + 1);
+
+ 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);
+
+ writel(ctrl, 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 resource *res;
+ struct aspeed_rtc *rtc;
+
+ 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);
+
+ platform_set_drvdata(pdev, rtc);
+
+ rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, pdev->name,
+ &aspeed_rtc_ops, THIS_MODULE);
+
+ if (IS_ERR(rtc->rtc_dev))
+ return PTR_ERR(rtc->rtc_dev);
+
+ spin_lock_init(&rtc->lock);
+
+ /* Enable RTC and clear the unlock bit */
+ writel(RTC_ENABLE, rtc->base + RTC_CTRL);
+
+ return 0;
+}
+
+static const struct of_device_id aspeed_rtc_match[] = {
+ { .compatible = "aspeed,ast2400-rtc", },
+ { .compatible = "aspeed,ast2500-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");
--
2.17.1
