1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Machine dependent access functions for RTC registers. 7 * 8 * Copyright (C) 1996, 1997, 1998 Ralf Baechle 9 * Copyright (C) 2002 Maciej W. Rozycki 10 */ 11 #ifndef _ASM_MC146818RTC_H 12 #define _ASM_MC146818RTC_H 13 14 #include <linux/config.h> 15 16 #include <asm/io.h> 17 18 19 /* 20 * This structure defines how to access various features of 21 * different machine types and how to access them. 22 */ 23 struct rtc_ops { 24 /* How to access the RTC register in a DS1287. */ 25 unsigned char (*rtc_read_data)(unsigned long addr); 26 void (*rtc_write_data)(unsigned char data, unsigned long addr); 27 int (*rtc_bcd_mode)(void); 28 }; 29 30 extern struct rtc_ops *rtc_ops; 31 32 /* 33 * Most supported machines access the RTC index register via an ISA 34 * port access but the way to access the date register differs ... 35 * The DECstation directly maps the RTC memory in the CPU's address 36 * space with the chipset generating necessary index write/data access 37 * cycles automagically. 38 */ 39 #define CMOS_READ(addr) ({ \ 40 rtc_ops->rtc_read_data(addr); \ 41 }) 42 #define CMOS_WRITE(val, addr) ({ \ 43 rtc_ops->rtc_write_data(val, addr); \ 44 }) 45 #define RTC_ALWAYS_BCD \ 46 rtc_ops->rtc_bcd_mode() 47 48 49 #ifdef CONFIG_DECSTATION 50 51 #include <asm/dec/rtc-dec.h> 52 53 #else 54 55 #define RTC_PORT(x) (0x70 + (x)) 56 #define RTC_IRQ 8 57 58 #endif 59 60 #endif /* _ASM_MC146818RTC_H */ 61