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Diffstat (limited to 'include/asm-alpha/mc146818rtc.h')
-rw-r--r--include/asm-alpha/mc146818rtc.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/include/asm-alpha/mc146818rtc.h b/include/asm-alpha/mc146818rtc.h
new file mode 100644
index 000000000000..097703f1c8cb
--- /dev/null
+++ b/include/asm-alpha/mc146818rtc.h
@@ -0,0 +1,27 @@
+/*
+ * Machine dependent access functions for RTC registers.
+ */
+#ifndef __ASM_ALPHA_MC146818RTC_H
+#define __ASM_ALPHA_MC146818RTC_H
+
+#include <asm/io.h>
+
+#ifndef RTC_PORT
+#define RTC_PORT(x) (0x70 + (x))
+#define RTC_ALWAYS_BCD 1 /* RTC operates in binary mode */
+#endif
+
+/*
+ * The yet supported machines all access the RTC index register via
+ * an ISA port access but the way to access the date register differs ...
+ */
+#define CMOS_READ(addr) ({ \
+outb_p((addr),RTC_PORT(0)); \
+inb_p(RTC_PORT(1)); \
+})
+#define CMOS_WRITE(val, addr) ({ \
+outb_p((addr),RTC_PORT(0)); \
+outb_p((val),RTC_PORT(1)); \
+})
+
+#endif /* __ASM_ALPHA_MC146818RTC_H */