[POWERPC] Add powerpc get/set_rtc_time interface to new generic rtc class

Add powerpc get/set_rtc_time interface to new generic rtc class. This
abstracts rtc chip specific code from the platform code for rtc-over-i2c
platforms.  Specific RTC chip support is now configured under
Device Drivers -> Real Time Clock. Setting time of day from the RTC
on startup is also configurable.

this time without the potentially platform breaking initcall.

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

2 files changed, 47 insertions, 1 deletions

diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 7a3c3f791ade..b4ed362c457a 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -1048,6 +1048,48 @@ void __init time_init(void)
         set_dec(tb_ticks_per_jiffy);
 }
 
+#ifdef CONFIG_RTC_CLASS
+static int set_rtc_class_time(struct rtc_time *tm)
+{
+        int err;
+        struct class_device *class_dev =
+                rtc_class_open(CONFIG_RTC_HCTOSYS_DEVICE);
+
+        if (class_dev == NULL)
+                return -ENODEV;
+
+        err = rtc_set_time(class_dev, tm);
+
+        rtc_class_close(class_dev);
+
+        return 0;
+}
+
+static void get_rtc_class_time(struct rtc_time *tm)
+{
+        int err;
+        struct class_device *class_dev =
+                rtc_class_open(CONFIG_RTC_HCTOSYS_DEVICE);
+
+        if (class_dev == NULL)
+                return;
+
+        err = rtc_read_time(class_dev, tm);
+
+        rtc_class_close(class_dev);
+
+        return;
+}
+
+int __init rtc_class_hookup(void)
+{
+        ppc_md.get_rtc_time = get_rtc_class_time;
+        ppc_md.set_rtc_time = set_rtc_class_time;
+
+        return 0;
+}
+#endif /* CONFIG_RTC_CLASS */
+
 
 #define FEBRUARY        2
 #define STARTOFTIME     1970
diff --git a/include/asm-powerpc/time.h b/include/asm-powerpc/time.h
index 5785ac4737b5..b051d4c88c3b 100644
--- a/include/asm-powerpc/time.h
+++ b/include/asm-powerpc/time.h
@@ -39,6 +39,10 @@ extern void generic_calibrate_decr(void);
 extern void wakeup_decrementer(void);
 extern void snapshot_timebase(void);
 
+#ifdef CONFIG_RTC_CLASS
+extern int __init rtc_class_hookup(void);
+#endif
+
 /* Some sane defaults: 125 MHz timebase, 1GHz processor */
 extern unsigned long ppc_proc_freq;
 #define DEFAULT_PROC_FREQ       (DEFAULT_TB_FREQ * 8)
@@ -234,4 +238,4 @@ extern void snapshot_timebases(void);
 #endif
 
 #endif /* __KERNEL__ */
-#endif /* __PPC64_TIME_H */
+#endif /* __POWERPC_TIME_H */