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path: root/drivers/rtc/rtc-starfire.c
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Diffstat (limited to 'drivers/rtc/rtc-starfire.c')
-rw-r--r--drivers/rtc/rtc-starfire.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-starfire.c b/drivers/rtc/rtc-starfire.c
new file mode 100644
index 000000000..fbd1ed41c
--- /dev/null
+++ b/drivers/rtc/rtc-starfire.c
@@ -0,0 +1,60 @@
+/* rtc-starfire.c: Starfire platform RTC driver.
+ *
+ * Author: David S. Miller
+ * License: GPL
+ *
+ * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/rtc.h>
+#include <linux/platform_device.h>
+
+#include <asm/oplib.h>
+
+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)
+{
+ rtc_time64_to_tm(starfire_get_time(), tm);
+ return 0;
+}
+
+static const struct rtc_class_ops starfire_rtc_ops = {
+ .read_time = starfire_read_time,
+};
+
+static int __init starfire_rtc_probe(struct platform_device *pdev)
+{
+ struct rtc_device *rtc;
+
+ rtc = devm_rtc_allocate_device(&pdev->dev);
+ if (IS_ERR(rtc))
+ return PTR_ERR(rtc);
+
+ rtc->ops = &starfire_rtc_ops;
+ rtc->range_max = U32_MAX;
+
+ platform_set_drvdata(pdev, rtc);
+
+ return devm_rtc_register_device(rtc);
+}
+
+static struct platform_driver starfire_rtc_driver = {
+ .driver = {
+ .name = "rtc-starfire",
+ },
+};
+
+builtin_platform_driver_probe(starfire_rtc_driver, starfire_rtc_probe);