rtc: Add Sun4V hypervisor RTC driver.
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
---
drivers/rtc/Kconfig | 7 ++
drivers/rtc/Makefile | 1 +
drivers/rtc/rtc-sun4v.c | 163 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 171 insertions(+), 0 deletions(-)
create mode 100644 drivers/rtc/rtc-sun4v.c
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 5d600ff..23403fa 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -592,4 +592,11 @@ config RTC_DRV_PPC
the RTC. This exposes that functionality through the generic RTC
class.
+config RTC_DRV_SUN4V
+ bool "SUN4V Hypervisor RTC"
+ depends on SPARC64
+ help
+ If you say Y here you will get support for the Hypervisor
+ based RTC on SUN4V systems.
+
endif # RTC_CLASS
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index fed42c2..6850b04 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_RTC_DRV_M41T94) += rtc-m41t94.o
obj-$(CONFIG_RTC_DRV_M48T59) += rtc-m48t59.o
obj-$(CONFIG_RTC_DRV_M48T86) += rtc-m48t86.o
obj-$(CONFIG_RTC_DRV_BQ4802) += rtc-bq4802.o
+obj-$(CONFIG_RTC_DRV_SUN4V) += rtc-sun4v.o
obj-$(CONFIG_RTC_DRV_MAX6900) += rtc-max6900.o
obj-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o
obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o
diff --git a/drivers/rtc/rtc-sun4v.c b/drivers/rtc/rtc-sun4v.c
new file mode 100644
index 0000000..3877bd4
--- /dev/null
+++ b/drivers/rtc/rtc-sun4v.c
@@ -0,0 +1,163 @@
+/* rtc-sun4c.c: Hypervisor based RTC for SUN4V systems.
+ *
+ * Copyright (C) 2008 David S. Miller <davem@xxxxxxxxxxxxx>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/time.h>
+#include <linux/rtc.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+#include <asm/hypervisor.h>
+
+MODULE_AUTHOR("David S. Miller <davem@xxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("SUN4V RTC driver");
+MODULE_LICENSE("GPL");
+
+struct sun4v_rtc {
+ struct rtc_device *rtc;
+ spinlock_t lock;
+};
+
+static unsigned long hypervisor_get_time(void)
+{
+ unsigned long ret, time;
+ int retries = 10000;
+
+retry:
+ ret = sun4v_tod_get(&time);
+ if (ret == HV_EOK)
+ return time;
+ if (ret == HV_EWOULDBLOCK) {
+ if (--retries > 0) {
+ udelay(100);
+ goto retry;
+ }
+ printk(KERN_WARNING "SUN4V: tod_get() timed out.\n");
+ return 0;
+ }
+ printk(KERN_WARNING "SUN4V: tod_get() not supported.\n");
+ return 0;
+}
+
+static int sun4v_read_time(struct device *dev, struct rtc_time *tm)
+{
+ struct sun4v_rtc *p = dev_get_drvdata(dev);
+ unsigned long flags, secs;
+
+ spin_lock_irqsave(&p->lock, flags);
+ secs = hypervisor_get_time();
+ spin_unlock_irqrestore(&p->lock, flags);
+
+ rtc_time_to_tm(secs, tm);
+
+ return 0;
+}
+
+static int hypervisor_set_time(unsigned long secs)
+{
+ unsigned long ret;
+ int retries = 10000;
+
+retry:
+ ret = sun4v_tod_set(secs);
+ if (ret == HV_EOK)
+ return 0;
+ if (ret == HV_EWOULDBLOCK) {
+ if (--retries > 0) {
+ udelay(100);
+ goto retry;
+ }
+ printk(KERN_WARNING "SUN4V: tod_set() timed out.\n");
+ return -EAGAIN;
+ }
+ printk(KERN_WARNING "SUN4V: tod_set() not supported.\n");
+ return -EOPNOTSUPP;
+}
+
+static int sun4v_set_time(struct device *dev, struct rtc_time *tm)
+{
+ struct sun4v_rtc *p = dev_get_drvdata(dev);
+ unsigned long flags, secs;
+ int err;
+
+ err = rtc_tm_to_time(tm, &secs);
+ if (err)
+ return err;
+
+ spin_lock_irqsave(&p->lock, flags);
+ err = hypervisor_set_time(secs);
+ spin_unlock_irqrestore(&p->lock, flags);
+
+ return err;
+}
+
+static const struct rtc_class_ops sun4v_rtc_ops = {
+ .read_time = sun4v_read_time,
+ .set_time = sun4v_set_time,
+};
+
+
+static int __devinit sun4v_rtc_probe(struct of_device *op,
+ const struct of_device_id *match)
+{
+ struct sun4v_rtc *p = kzalloc(sizeof(*p), GFP_KERNEL);
+
+ if (!p)
+ return -ENOMEM;
+
+ spin_lock_init(&p->lock);
+
+ p->rtc = rtc_device_register("sun4v", &op->dev,
+ &sun4v_rtc_ops, THIS_MODULE);
+ if (IS_ERR(p->rtc)) {
+ int err = PTR_ERR(p->rtc);
+ kfree(p);
+ return err;
+ }
+ dev_set_drvdata(&op->dev, p);
+ return 0;
+}
+
+static int __devexit sun4v_rtc_remove(struct of_device *op)
+{
+ struct sun4v_rtc *p = dev_get_drvdata(&op->dev);
+
+ rtc_device_unregister(p->rtc);
+ kfree(p);
+
+ return 0;
+}
+
+static struct of_device_id sun4v_rtc_match[] = {
+ {
+ .name = "rtc",
+ .compatible = "SUNW,sun4v-tod",
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, sun4v_rtc_match);
+
+static struct of_platform_driver sun4v_rtc_driver = {
+ .name = "rtc-sun4v",
+ .match_table = sun4v_rtc_match,
+ .probe = sun4v_rtc_probe,
+ .remove = __devexit_p(sun4v_rtc_remove),
+};
+
+static int __init sun4v_rtc_init(void)
+{
+ return of_register_driver(&sun4v_rtc_driver, &of_bus_type);
+}
+
+static void __exit sun4v_rtc_exit(void)
+{
+ of_unregister_driver(&sun4v_rtc_driver);
+}
+
+module_init(sun4v_rtc_init);
+module_exit(sun4v_rtc_exit);
--
1.5.6.5.GIT
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