arch/mips/include/asm/mach-dec/mc146818rtc.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * RTC definitions for DECstation style attached Dallas DS1287 chip.
   4  *
   5  * Copyright (C) 1998, 2001 by Ralf Baechle
   6  * Copyright (C) 1998 by Harald Koerfgen
   7  * Copyright (C) 2002, 2005  Maciej W. Rozycki
   8  */
   9 #ifndef __ASM_MIPS_DEC_RTC_DEC_H
  10 #define __ASM_MIPS_DEC_RTC_DEC_H
  11
  12 #include <linux/types.h>
  13 #include <asm/addrspace.h>
  14 #include <asm/dec/system.h>
  15
  16 extern volatile u8 *dec_rtc_base;
  17
  18 #define ARCH_RTC_LOCATION
  19
  20 #define RTC_PORT(x)     CPHYSADDR((long)dec_rtc_base)
  21 #define RTC_IO_EXTENT   dec_kn_slot_size
  22 #define RTC_IOMAPPED    0
  23 #undef RTC_IRQ
  24
  25 #define RTC_DEC_YEAR    0x3f    /* Where we store the real year on DECs.  */
  26
  27 static inline unsigned char CMOS_READ(unsigned long addr)
  28 {
  29         return dec_rtc_base[addr * 4];
  30 }
  31
  32 static inline void CMOS_WRITE(unsigned char data, unsigned long addr)
  33 {
  34         dec_rtc_base[addr * 4] = data;
  35 }
  36
  37 #define RTC_ALWAYS_BCD  0
  38
  39 #endif /* __ASM_MIPS_DEC_RTC_DEC_H */