mc146818rtc.h
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上传日期:2013-04-10
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- /*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Machine dependent access functions for RTC registers.
- *
- * Copyright (C) 1996, 1997, 1998, 2000 Ralf Baechle
- * Copyright (C) 2002 Maciej W. Rozycki
- */
- #ifndef _ASM_MC146818RTC_H
- #define _ASM_MC146818RTC_H
- #include <linux/config.h>
- #include <asm/io.h>
- /*
- * This structure defines how to access various features of
- * different machine types and how to access them.
- */
- struct rtc_ops {
- /* How to access the RTC register in a DS1287. */
- unsigned char (*rtc_read_data)(unsigned long addr);
- void (*rtc_write_data)(unsigned char data, unsigned long addr);
- int (*rtc_bcd_mode)(void);
- };
- extern struct rtc_ops *rtc_ops;
- /*
- * Most supported machines access the RTC index register via an ISA
- * port access but the way to access the date register differs ...
- * The DECstation directly maps the RTC memory in the CPU's address
- * space with the chipset generating necessary index write/data access
- * cycles automagically.
- */
- #define CMOS_READ(addr) ({
- rtc_ops->rtc_read_data(addr);
- })
- #define CMOS_WRITE(val, addr) ({
- rtc_ops->rtc_write_data(val, addr);
- })
- #define RTC_ALWAYS_BCD
- rtc_ops->rtc_bcd_mode()
- #ifdef CONFIG_DECSTATION
- #include <asm/dec/rtc-dec.h>
- #elif defined(CONFIG_MIPS_ITE8172) || defined(CONFIG_MIPS_IVR)
- #include <asm/it8172/it8172_int.h>
- #define RTC_PORT(x) (0x14014800 + (x))
- #define RTC_IOMAPPED 0
- #define RTC_IRQ IT8172_RTC_IRQ
- #elif defined(CONFIG_MIPS_PB1500) || defined(CONFIG_MIPS_PB1100)
- #define RTC_PORT(x) (0x0c000000 + (x))
- #define RTC_IOMAPPED 0
- #define RTC_IRQ 0
- #else
- #define RTC_PORT(x) (0x70 + (x))
- #define RTC_IRQ 8
- #endif
- #endif /* _ASM_MC146818RTC_H */