2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1998, 2001, 03 by Ralf Baechle
8 * RTC routines for PC style attached Dallas chip.
10 #ifndef __ASM_MACH_GENERIC_MC146818RTC_H
11 #define __ASM_MACH_GENERIC_MC146818RTC_H
15 #define RTC_PORT(x) (0x70 + (x))
18 static inline unsigned char CMOS_READ(unsigned long addr)
20 outb_p(addr, RTC_PORT(0));
21 return inb_p(RTC_PORT(1));
24 static inline void CMOS_WRITE(unsigned char data, unsigned long addr)
26 outb_p(addr, RTC_PORT(0));
27 outb_p(data, RTC_PORT(1));
30 #define RTC_ALWAYS_BCD 1
32 #ifndef mc146818_decode_year
33 #define mc146818_decode_year(year) ((year) < 70 ? (year) + 2000 : (year) + 1900)
36 #endif /* __ASM_MACH_GENERIC_MC146818RTC_H */