[PATCH] char/rtc: Handle memory-mapped chips properly

Handle memory-mapped chips properly, needed for example on DECstations.
This support was in Linux 2.4 but for some reason got lost in 2.6.  This
patch is taken directly from the linux-mips repository.

[akpm@osdl.org: cleanup]
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Martin Michlmayr <tbm@cyrius.com>
Cc: Paul Gortmaker <penguin@muskoka.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/include/asm-mips/mach-dec/mc146818rtc.h b/include/asm-mips/mach-dec/mc146818rtc.h
index 6d37a56..6724e99 100644
--- a/include/asm-mips/mach-dec/mc146818rtc.h
+++ b/include/asm-mips/mach-dec/mc146818rtc.h
@@ -19,6 +19,8 @@
 
 extern volatile u8 *dec_rtc_base;
 
+#define ARCH_RTC_LOCATION
+
 #define RTC_PORT(x)	CPHYSADDR((long)dec_rtc_base)
 #define RTC_IO_EXTENT	dec_kn_slot_size
 #define RTC_IOMAPPED	0
diff --git a/include/linux/mc146818rtc.h b/include/linux/mc146818rtc.h
index bbc93ae..432b2fa 100644
--- a/include/linux/mc146818rtc.h
+++ b/include/linux/mc146818rtc.h
@@ -89,4 +89,11 @@
 # define RTC_VRT 0x80		/* valid RAM and time */
 /**********************************************************************/
 
+#ifndef ARCH_RTC_LOCATION	/* Override by <asm/mc146818rtc.h>? */
+
+#define RTC_IO_EXTENT	0x8
+#define RTC_IOMAPPED	1	/* Default to I/O mapping. */
+
+#endif /* ARCH_RTC_LOCATION */
+
 #endif /* _MC146818RTC_H */