arch/arm/include/asm/mc146818rtc.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Machine dependent access functions for RTC registers.
   4  */
   5 #ifndef _ASM_MC146818RTC_H
   6 #define _ASM_MC146818RTC_H
   7
   8 #include <linux/io.h>
   9 #include <linux/kernel.h>
  10
  11 #define RTC_IRQ BUILD_BUG_ON(1)
  12
  13 #ifndef RTC_PORT
  14 #define RTC_PORT(x)     (0x70 + (x))
  15 #define RTC_ALWAYS_BCD  1       /* RTC operates in binary mode */
  16 #endif
  17
  18 /*
  19  * The yet supported machines all access the RTC index register via
  20  * an ISA port access but the way to access the date register differs ...
  21  */
  22 #define CMOS_READ(addr) ({ \
  23 outb_p((addr),RTC_PORT(0)); \
  24 inb_p(RTC_PORT(1)); \
  25 })
  26 #define CMOS_WRITE(val, addr) ({ \
  27 outb_p((addr),RTC_PORT(0)); \
  28 outb_p((val),RTC_PORT(1)); \
  29 })
  30
  31 #endif /* _ASM_MC146818RTC_H */