arch/alpha/include/asm/mc146818rtc.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Machine dependent access functions for RTC registers.
   4  */
   5 #ifndef __ASM_ALPHA_MC146818RTC_H
   6 #define __ASM_ALPHA_MC146818RTC_H
   7
   8 #include <asm/io.h>
   9
  10 #ifndef RTC_PORT
  11 #define RTC_PORT(x)     (0x70 + (x))
  12 #define RTC_ALWAYS_BCD  1       /* RTC operates in binary mode */
  13 #endif
  14
  15 /*
  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 ...
  18  */
  19 #define CMOS_READ(addr) ({ \
  20 outb_p((addr),RTC_PORT(0)); \
  21 inb_p(RTC_PORT(1)); \
  22 })
  23 #define CMOS_WRITE(val, addr) ({ \
  24 outb_p((addr),RTC_PORT(0)); \
  25 outb_p((val),RTC_PORT(1)); \
  26 })
  27
  28 #endif /* __ASM_ALPHA_MC146818RTC_H */