include/asm-mips/mc146818rtc.h

   1 /* $Id: mc146818rtc.h,v 1.3 1998/06/25 20:19:26 ralf Exp $
   2  *
   3  * This file is subject to the terms and conditions of the GNU General Public
   4  * License.  See the file "COPYING" in the main directory of this archive
   5  * for more details.
   6  *
   7  * Machine dependent access functions for RTC registers.
   8  *
   9  * Copyright (C) 1996, 1997, 1998 Ralf Baechle
  10  */
  11 #ifndef __ASM_MIPS_MC146818RTC_H
  12 #define __ASM_MIPS_MC146818RTC_H
  13
  14 #include <asm/io.h>
  15
  16 #ifndef RTC_PORT
  17 #define RTC_PORT(x)     (0x70 + (x))
  18 #endif
  19
  20 /*
  21  * The yet supported machines all access the RTC index register via
  22  * an ISA port access but the way to access the date register differs ...
  23  */
  24 #define CMOS_READ(addr) ({ \
  25 rtc_ops->rtc_read_data(addr); \
  26 })
  27 #define CMOS_WRITE(val, addr) ({ \
  28 rtc_ops->rtc_write_data(val, addr); \
  29 })
  30 #define RTC_ALWAYS_BCD \
  31 rtc_ops->rtc_bcd_mode()
  32
  33 /*
  34  * This structure defines how to access various features of
  35  * different machine types and how to access them.
  36  */
  37 struct rtc_ops {
  38         /* How to access the RTC register in a DS1287.  */
  39         unsigned char (*rtc_read_data)(unsigned long addr);
  40         void (*rtc_write_data)(unsigned char data, unsigned long addr);
  41         int (*rtc_bcd_mode)(void);
  42 };
  43
  44 extern struct rtc_ops *rtc_ops;
  45
  46 #endif /* __ASM_MIPS_MC146818RTC_H */