1 /* 2 * Machine dependent access functions for RTC registers. 3 */ 4 #ifndef _ASM_MC146818RTC_H 5 #define _ASM_MC146818RTC_H 6 7 #include <linux/io.h> 8 #include <linux/kernel.h> 9 10 #define RTC_IRQ BUILD_BUG_ON(1) 11 12 #ifndef RTC_PORT 13 #define RTC_PORT(x) (0x70 + (x)) 14 #define RTC_ALWAYS_BCD 1 /* RTC operates in binary mode */ 15 #endif 16 17 /* 18 * The yet supported machines all access the RTC index register via 19 * an ISA port access but the way to access the date register differs ... 20 */ 21 #define CMOS_READ(addr) ({ \ 22 outb_p((addr),RTC_PORT(0)); \ 23 inb_p(RTC_PORT(1)); \ 24 }) 25 #define CMOS_WRITE(val, addr) ({ \ 26 outb_p((addr),RTC_PORT(0)); \ 27 outb_p((val),RTC_PORT(1)); \ 28 }) 29 30 #endif /* _ASM_MC146818RTC_H */ 31