rtc: Add Starfire platform RTC driver.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 23403fae45a74505123bed763b2694a57c723f50..ecdff2002476eaf170c31402a7edaf30e3f84dd8 100644 (file)
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -599,4 +599,11 @@ config RTC_DRV_SUN4V
          If you say Y here you will get support for the Hypervisor
          based RTC on SUN4V systems.
 
+config RTC_DRV_STARFIRE
+       bool "Starfire RTC"
+       depends on SPARC64
+       help
+         If you say Y here you will get support for the RTC found on
+         Starfire systems.
+
 endif # RTC_CLASS

diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 6850b04a9dd8878caf2f6538c1835fb1661e80a5..10f41f85c38a0fbbea375e7d38b5ef1ea3a805a1 100644 (file)
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -40,6 +40,7 @@ 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-$(CONFIG_RTC_DRV_STARFIRE) += rtc-starfire.o
 obj-$(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-starfire.c b/drivers/rtc/rtc-starfire.c
new file mode 100644 (file)
index 0000000..7ccb0dd
--- /dev/null
+++ b/drivers/rtc/rtc-starfire.c
@@ -0,0 +1,120 @@
+/* rtc-starfire.c: Starfire platform RTC driver.
+ *
+ * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/time.h>
+#include <linux/rtc.h>
+#include <linux/platform_device.h>
+
+#include <asm/oplib.h>
+
+MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
+MODULE_DESCRIPTION("Starfire RTC driver");
+MODULE_LICENSE("GPL");
+
+struct starfire_rtc {
+       struct rtc_device       *rtc;
+       spinlock_t              lock;
+};
+
+static u32 starfire_get_time(void)
+{
+       static char obp_gettod[32];
+       static u32 unix_tod;
+
+       sprintf(obp_gettod, "h# %08x unix-gettod",
+               (unsigned int) (long) &unix_tod);
+       prom_feval(obp_gettod);
+
+       return unix_tod;
+}
+
+static int starfire_read_time(struct device *dev, struct rtc_time *tm)
+{
+       struct starfire_rtc *p = dev_get_drvdata(dev);
+       unsigned long flags, secs;
+
+       spin_lock_irqsave(&p->lock, flags);
+       secs = starfire_get_time();
+       spin_unlock_irqrestore(&p->lock, flags);
+
+       rtc_time_to_tm(secs, tm);
+
+       return 0;
+}
+
+static int starfire_set_time(struct device *dev, struct rtc_time *tm)
+{
+       unsigned long secs;
+       int err;
+
+       err = rtc_tm_to_time(tm, &secs);
+       if (err)
+               return err;
+
+       /* Do nothing, time is set using the service processor
+        * console on this platform.
+        */
+       return 0;
+}
+
+static const struct rtc_class_ops starfire_rtc_ops = {
+       .read_time      = starfire_read_time,
+       .set_time       = starfire_set_time,
+};
+
+static int __devinit starfire_rtc_probe(struct platform_device *pdev)
+{
+       struct starfire_rtc *p = kzalloc(sizeof(*p), GFP_KERNEL);
+
+       if (!p)
+               return -ENOMEM;
+
+       spin_lock_init(&p->lock);
+
+       p->rtc = rtc_device_register("starfire", &pdev->dev,
+                                    &starfire_rtc_ops, THIS_MODULE);
+       if (IS_ERR(p->rtc)) {
+               int err = PTR_ERR(p->rtc);
+               kfree(p);
+               return err;
+       }
+       platform_set_drvdata(pdev, p);
+       return 0;
+}
+
+static int __devexit starfire_rtc_remove(struct platform_device *pdev)
+{
+       struct starfire_rtc *p = platform_get_drvdata(pdev);
+
+       rtc_device_unregister(p->rtc);
+       kfree(p);
+
+       return 0;
+}
+
+static struct platform_driver starfire_rtc_driver = {
+       .driver         = {
+               .name   = "rtc-starfire",
+               .owner  = THIS_MODULE,
+       },
+       .probe          = starfire_rtc_probe,
+       .remove         = __devexit_p(starfire_rtc_remove),
+};
+
+static int __init starfire_rtc_init(void)
+{
+       return platform_driver_register(&starfire_rtc_driver);
+}
+
+static void __exit starfire_rtc_exit(void)
+{
+       platform_driver_unregister(&starfire_rtc_driver);
+}
+
+module_init(starfire_rtc_init);
+module_exit(starfire_rtc_exit);