2 * Machine dependent access functions for RTC registers.
4 #ifndef _ASM_MC146818RTC_H
5 #define _ASM_MC146818RTC_H
7 #include <asm/arch/irqs.h>
11 #define RTC_PORT(x) (0x70 + (x))
12 #define RTC_ALWAYS_BCD 1 /* RTC operates in binary mode */
16 * The yet supported machines all access the RTC index register via
17 * an ISA port access but the way to access the date register differs ...
21 #define CMOS_READ(addr) ({ \
22 outb_p((addr),RTC_PORT(0)); \
25 #define CMOS_WRITE(val, addr) ({ \
26 outb_p((addr),RTC_PORT(0)); \
27 outb_p((val),RTC_PORT(1)); \
30 #ifdef CONFIG_ARCH_RISCSTATION
32 /* RiscStation hardware has a lock to ensure random read/writes can't
33 * do anything nasty to it
39 #define CMOS_READ(addr) ({ \
40 outb_p((addr),RTC_PORT(0)); \
41 outb_p((addr),RTC_PORT(3)); \
44 #define CMOS_WRITE(val, addr) ({ \
45 outb_p((addr),RTC_PORT(0)); \
46 outb_p((addr),RTC_PORT(3)); \
47 outb_p((val),RTC_PORT(1)); \
49 #endif /* CONFIG_ARCH_RISCSTATION */
51 #endif /* _ASM_MC146818RTC_H */