From a1f514f197932b3e5fcb5e32a197ce1df836576a Mon Sep 17 00:00:00 2001 From: Joel Sherrill Date: Tue, 28 Jul 1998 23:03:40 +0000 Subject: First cut implementation of real-time clock support in libchip. This version compiles cleanly but there is not a BSP with a configuration table to utilize it. --- c/src/libchip/rtc/Makefile.in | 4 +- c/src/libchip/rtc/m48t08.c | 152 ++++++++++++++++++++++++++++++++++++++++++ c/src/libchip/rtc/m48t08.h | 36 ++++++++++ c/src/libchip/rtc/rtc.h | 11 +-- c/src/libchip/rtc/rtcprobe.c | 24 +++++++ 5 files changed, 221 insertions(+), 6 deletions(-) create mode 100644 c/src/libchip/rtc/m48t08.c create mode 100644 c/src/libchip/rtc/m48t08.h create mode 100644 c/src/libchip/rtc/rtcprobe.c (limited to 'c/src/libchip') diff --git a/c/src/libchip/rtc/Makefile.in b/c/src/libchip/rtc/Makefile.in index c7dc34db1a..06b1389473 100644 --- a/c/src/libchip/rtc/Makefile.in +++ b/c/src/libchip/rtc/Makefile.in @@ -12,11 +12,13 @@ LIBNAME=librtcio.a LIB=${ARCH}/${LIBNAME} C_PIECES=\ + rtcprobe m48t08 C_FILES=$(C_PIECES:%=%.c) C_O_FILES=$(C_PIECES:%=${ARCH}/%.o) -INSTALLED_H_FILES=$(srcdir)/rtc.h +INSTALLED_H_FILES=$(srcdir)/rtc.h $(srcdir)/m48t08.h + SRCS=$(C_FILES) $(H_FILES) $(SYS_H_FILES) $(RTEMS_H_FILES) $(PRIVATE_H_FILES) OBJS=$(C_O_FILES) diff --git a/c/src/libchip/rtc/m48t08.c b/c/src/libchip/rtc/m48t08.c new file mode 100644 index 0000000000..5cfd317257 --- /dev/null +++ b/c/src/libchip/rtc/m48t08.c @@ -0,0 +1,152 @@ +/* + * This file interfaces with the real-time clock found in + * a Mostek M48T08 or M48T18 or compatibles. + * + * Year 2K Notes: + * + * This chip only uses a two digit field to store the year. This + * code uses the RTEMS Epoch as a pivot year. This lets us map the + * two digit year field as follows: + * + * + two digit years 0-87 are mapped to 2000-2087. + * + two digit years 88-99 are mapped to 1988-1999. + * + * This is less than the time span supported by RTEMS. + * + * COPYRIGHT (c) 1989-1998. + * On-Line Applications Research Corporation (OAR). + * Copyright assigned to U.S. Government, 1994. + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + * $Id$ + */ + +#include +#include +#include + +/* + * Control register bits + */ + +#define MK48T08_CONTROL_WRITE 0x80 +#define MK48T08_CONTROL_READ 0x40 +#define MK48T08_CONTROL_SIGN 0x20 + +/* + * m48t08_initialize + */ + +void m48t08_initialize( + int minor +) +{ +} + +/* + * m48t08_get_time + */ + +#define From_BCD( _x ) ((((_x) >> 4) * 10) + ((_x) & 0x0F)) +#define To_BCD( _x ) ((((_x) / 10) << 4) + ((_x) % 10)) + +int m48t08_get_time( + int minor, + rtems_time_of_day *time +) +{ + unsigned32 m48t08; + getRegister_f getReg; + setRegister_f setReg; + unsigned8 controlReg; + unsigned32 value1; + unsigned32 value2; + + m48t08 = RTC_Port_Tbl[ minor ].ulCtrlPort1; + getReg = RTC_Port_Tbl[ minor ].getRegister; + setReg = RTC_Port_Tbl[ minor ].setRegister; + + /* + * Put the RTC into read mode + */ + + controlReg = (*getReg)( m48t08, M48T08_CONTROL ); + (*setReg)( m48t08, M48T08_CONTROL, controlReg | MK48T08_CONTROL_READ ); + + value1 = (*getReg)( m48t08, M48T08_YEAR ); + value2 = From_BCD( value1 ); + if ( value2 < 88 ) + time->year = 2000 + value2; + else + time->year = 1900 + value2; + + value1 = (*getReg)( m48t08, M48T08_MONTH ); + time->month = From_BCD( value1 ); + + value1 = (*getReg)( m48t08, M48T08_DATE ); + time->day = From_BCD( value1 ); + + value1 = (*getReg)( m48t08, M48T08_HOUR ); + time->hour = From_BCD( value1 ); + + value1 = (*getReg)( m48t08, M48T08_MINUTE ); + time->minute = From_BCD( value1 ); + + value1 = (*getReg)( m48t08, M48T08_SECOND ); + time->second = From_BCD( value1 ); + + /* + * Put the RTC back into normal mode. + */ + + (*setReg)( m48t08, M48T08_CONTROL, controlReg ); + + return 0; +} + +/* + * m48t08_set_time + */ + +int m48t08_set_time( + int minor, + rtems_time_of_day *time +) +{ + unsigned32 m48t08; + getRegister_f getReg; + setRegister_f setReg; + unsigned8 controlReg; + + m48t08 = RTC_Port_Tbl[ minor ].ulCtrlPort1; + getReg = RTC_Port_Tbl[ minor ].getRegister; + setReg = RTC_Port_Tbl[ minor ].setRegister; + + /* + * Put the RTC into read mode + */ + + controlReg = (*getReg)( m48t08, M48T08_CONTROL ); + (*setReg)( m48t08, M48T08_CONTROL, controlReg | MK48T08_CONTROL_WRITE ); + + if ( time->year >= 2088 ) + rtems_fatal_error_occurred( RTEMS_INVALID_NUMBER ); + + (*setReg)( m48t08, M48T08_YEAR, To_BCD(time->year % 100) ); + (*setReg)( m48t08, M48T08_MONTH, To_BCD(time->month) ); + (*setReg)( m48t08, M48T08_DATE, To_BCD(time->day) ); + (*setReg)( m48t08, M48T08_HOUR, To_BCD(time->hour) ); + (*setReg)( m48t08, M48T08_MINUTE, To_BCD(time->minute) ); + (*setReg)( m48t08, M48T08_SECOND, To_BCD(time->second) ); + + /* + * Put the RTC back into normal mode. + */ + + (*setReg)( m48t08, M48T08_CONTROL, controlReg ); + + return 0; +} diff --git a/c/src/libchip/rtc/m48t08.h b/c/src/libchip/rtc/m48t08.h new file mode 100644 index 0000000000..cd2812cae5 --- /dev/null +++ b/c/src/libchip/rtc/m48t08.h @@ -0,0 +1,36 @@ +/* + * This file contains the definitions for the following real-time clocks: + * + * + Mostek M48T08 + * + Mostek M48T18 + * + Dallas Semiconductor DS1643 + * + * COPYRIGHT (c) 1989-1998. + * On-Line Applications Research Corporation (OAR). + * Copyright assigned to U.S. Government, 1994. + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + * $Id$ + */ + +#ifndef __LIBCHIP_M48T08_h +#define __LIBCHIP_M48T08_h + +/* + * Register indices + */ + +#define M48T08_CONTROL 0 +#define M48T08_SECOND 1 +#define M48T08_MINUTE 2 +#define M48T08_HOUR 3 +#define M48T08_DAY_OF_WEEK 4 +#define M48T08_DATE 5 +#define M48T08_MONTH 6 +#define M48T08_YEAR 7 + +#endif +/* end of include file */ diff --git a/c/src/libchip/rtc/rtc.h b/c/src/libchip/rtc/rtc.h index b517424b3c..05814b35be 100644 --- a/c/src/libchip/rtc/rtc.h +++ b/c/src/libchip/rtc/rtc.h @@ -20,11 +20,9 @@ * Types for get and set register routines */ -typedef unsigned8 (*getRegister_f)(unsigned32 port, unsigned8 register); -typedef void (*setRegister_f)( - unsigned32 port, unsigned8 reg, unsigned8 value); -typedef unsigned8 (*getData_f)(unsigned32 port); -typedef void (*setData_f)(unsigned32 port, unsigned8 value); +typedef unsigned32 (*getRegister_f)(unsigned32 port, unsigned8 register); +typedef void (*setRegister_f)( + unsigned32 port, unsigned8 reg, unsigned32 value); typedef struct _rtc_fns { boolean (*deviceProbe)(int minor); @@ -79,5 +77,8 @@ typedef struct _rtc_tbl { extern rtc_tbl RTC_Port_Tbl[]; extern unsigned long RTC_Port_Count; + +boolean rtc_probe( int minor ); + #endif /* end of include file */ diff --git a/c/src/libchip/rtc/rtcprobe.c b/c/src/libchip/rtc/rtcprobe.c new file mode 100644 index 0000000000..6aaad89486 --- /dev/null +++ b/c/src/libchip/rtc/rtcprobe.c @@ -0,0 +1,24 @@ +/* + * This file contains the default Real-Time Clock probe routine. + * + * COPYRIGHT (c) 1989-1998. + * On-Line Applications Research Corporation (OAR). + * Copyright assigned to U.S. Government, 1994. + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + * $Id$ + */ + +#include +#include + + +boolean rtc_probe( + int minor +) +{ + return TRUE; +} -- cgit v1.2.3