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authorThomas Gleixner <tglx@linutronix.de>2008-01-30 13:30:26 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:30:26 +0100
commit6ce60b07e670e800c4c5cfe984ed5188e7a64135 (patch)
tree108c493c98bc8afa42e246c9494d59543556c8c4 /arch/x86/kernel/time_64.c
parent4ec08da02f0fda16fbc8dfa040568facaa576790 (diff)
x86: unify mc146818rtc.h - prepare for sharing rtc code
Unify mc146818rtc.h by adding the rtc_cmos_read/write functions to time_64.c. This is a preparatory patch to finaly share the rtc code, which is unsurprisingly similar. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/time_64.c')
-rw-r--r--arch/x86/kernel/time_64.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/x86/kernel/time_64.c b/arch/x86/kernel/time_64.c
index 368b1942b39..0a01504586a 100644
--- a/arch/x86/kernel/time_64.c
+++ b/arch/x86/kernel/time_64.c
@@ -69,6 +69,27 @@ unsigned long profile_pc(struct pt_regs *regs)
}
EXPORT_SYMBOL(profile_pc);
+/* Routines for accessing the CMOS RAM/RTC. */
+unsigned char rtc_cmos_read(unsigned char addr)
+{
+ unsigned char val;
+ lock_cmos_prefix(addr);
+ outb_p(addr, RTC_PORT(0));
+ val = inb_p(RTC_PORT(1));
+ lock_cmos_suffix(addr);
+ return val;
+}
+EXPORT_SYMBOL(rtc_cmos_read);
+
+void rtc_cmos_write(unsigned char val, unsigned char addr)
+{
+ lock_cmos_prefix(addr);
+ outb_p(addr, RTC_PORT(0));
+ outb_p(val, RTC_PORT(1));
+ lock_cmos_suffix(addr);
+}
+EXPORT_SYMBOL(rtc_cmos_write);
+
/*
* In order to set the CMOS clock precisely, set_rtc_mmss has to be called 500
* ms after the second nowtime has started, because when nowtime is written