//#pragma comment(exestr, "$Header: /usr4/winnt/SOURCES/halpcims/src/hal/halsnipm/mips/RCS/jxtime.c,v 1.2 1995/11/02 11:04:33 flo Exp $")
/*++
Copyright (c) 1993 SNI
Module Name:
SNItime.c
Abstract:
This module implements the HAL set/query realtime clock routines for
a MIPS R4000 SNI system.
Environment:
Kernel mode
--*/
#include "halp.h"
#define NVINDEX_STATE 0x6
#define NVSTATE_TODVALID 0x1
#define bcd_to_dec(x) ( ((((x) >> 4 ) & 0xf ) * 10 ) + ((x) & 0xf) )
#define dec_to_bcd(x) ( (((x) / 10) << 4) | ((x) % 10) )
#define RTC_NVRAM_SIZE 0x7ff // NVRAM size on this chip
// definitions for rtc 146818
#define RTC_SECS 0
#define RTC_SECA 1
#define RTC_MINS 2
#define RTC_MINA 3
#define RTC_HOURS 4
#define RTC_HOURA 5
#define RTC_DAYW 6
#define RTC_DAYM 7
#define RTC_MONTH 8
#define RTC_YEAR 9
#define RTC_REGA 10
#define RTC_REGB 11
#define RTC_REGC 12
#define RTC_REGD 13
#define RTC_MEM1 14
#define RTC_MEM2 128
/*
* Register B bit definitions
*/
#define RTCB_SET 0x80 /* inhibit date update */
#define RTCB_PIE 0x40 /* enable periodic interrupt */
#define RTCB_AIE 0x20 /* enable alarm interrupt */
#define RTCB_UIE 0x10 /* enable update-ended interrupt */
#define RTCB_SQWE 0x08 /* square wave enable */
#define RTCB_DMBINARY 0x04 /* binary data (0 => bcd data) */
#define RTCB_24HR 0x02 /* 24 hour mode (0 => 12 hour) */
#define RTCB_DSE 0x01 /* daylight savings mode enable */
/* Time of Day Clock */
struct todc {
short htenths;
short hsecs;
short hmins;
short hhours;
short hdays;
short hweekday;
short hmonth;
short hyear;
};
/* masks to get valid information */
#define MASK_CENT_SECS 0xFF
#define MASK_SECS 0x7F
#define MASK_MINS 0x7F
#define MASK_HOURS 0x3F
#define MASK_DAY_W 0x07
#define MASK_DAY_M 0x3F
#define MASK_MONTH 0x1F
#define MASK_YEAR 0xFF
//
// the reference year (we have only two digits for the year on the chip)
//
#define YRREF 1900
//
// Define forward referenced procedure prototypes.
//
BOOLEAN
HalQueryRealTimeClock (
OUT PTIME_FIELDS TimeFields
);
BOOLEAN
HalSetRealTimeClock (
IN PTIME_FIELDS TimeFields
);
VOID
HalpWrite146818(struct todc *todp, PUCHAR index, PUCHAR data);
VOID
HalpRead146818(struct todc *todp, PUCHAR index, PUCHAR data);
VOID
HalpPciReadTodc(struct todc *todp);
VOID
HalpPciWriteTodc(struct todc *todp);
UCHAR
HalpReadRegister146818(PUCHAR index, PUCHAR data, int reg);
VOID HalpWriteRegister146818(PUCHAR index, PUCHAR data, int reg, UCHAR val);
/* Calendar clock : For PCI Minitower and Desktop systems, the RTC is part of
* --------------- the SUPER_IO pc87323.
* It is software compatible with rtc146818.
*/
BOOLEAN
HalQueryRealTimeClock (
OUT PTIME_FIELDS TimeFields
)
/*++
Routine Description:
This routine queries the realtime clock.
N.B. this comment stand in jxtime.c:
This routine is required to provide any synchronization necessary
to query the realtime clock information.
Arguments:
TimeFields - Supplies a pointer to a time structure that receives
the realtime clock information.
Return Value:
If the power to the realtime clock has not failed, then the time
values are read from the realtime clock and a value of TRUE is
returned. Otherwise, a value of FALSE is returned.
--*/
{
register CSHORT month, dayweek, daymonth, year, hours, mins, secs, msecs;
struct todc ltodc;
KIRQL oldIrql;
KeRaiseIrql(HIGH_LEVEL, &oldIrql);
HalpPciReadTodc(<odc);
KeLowerIrql(oldIrql);
msecs = 0;
secs = ltodc.hsecs;
mins = ltodc.hmins;
hours = ltodc.hhours;
daymonth = ltodc.hdays;
dayweek = ltodc.hweekday;
month = ltodc.hmonth;
year = ltodc.hyear;
if (TimeFields)
{
TimeFields->Year = year+YRREF;
TimeFields->Month = month;
TimeFields->Day = daymonth;
TimeFields->Weekday = dayweek;
TimeFields->Hour = hours;
TimeFields->Minute = mins;
TimeFields->Second = secs;
TimeFields->Milliseconds = msecs;
}
return TRUE;
}
BOOLEAN
HalSetRealTimeClock (
IN PTIME_FIELDS TimeFields
)
/*++
Routine Description:
This routine sets the realtime clock.
N.B. this comment stand in jxtime.c:
This routine is required to provide anq synchronization necessary
to set the realtime clock information.
Arguments:
TimeFields - Supplies a pointer to a time structure that specifies the
realtime clock information.
Return Value:
If the power to the realtime clock has not failed, then the time
values are written to the realtime clock and a value of TRUE is
returned. Otherwise, a value of FALSE is returned.
--*/
{
struct todc ltodc;
KIRQL oldIrql;
UCHAR year, month, daymonth, dayweek, hours, mins, secs, msecs;
//
// If the realtime clock battery is still functioning, then write
// the realtime clock values, and return a function value of TRUE.
// Otherwise, return a function value of FALSE.
//
// this part has to be written
// if (...) return FALSE;
year = (UCHAR) ( (TimeFields->Year - YRREF) % 100 );
month = (UCHAR) TimeFields->Month;
daymonth = (UCHAR) TimeFields->Day;
dayweek = (UCHAR) TimeFields->Weekday;
hours = (UCHAR) TimeFields->Hour;
mins = (UCHAR) TimeFields->Minute;
secs = (UCHAR) TimeFields->Second;
msecs = (UCHAR) TimeFields->Milliseconds;
ltodc.htenths = 0;
ltodc.hsecs = secs;
ltodc.hmins = mins;
ltodc.hhours = hours;
ltodc.hdays = daymonth;
ltodc.hweekday = dayweek;
ltodc.hmonth = month;
ltodc.hyear = year;
KeRaiseIrql(HIGH_LEVEL, &oldIrql);
HalpPciWriteTodc(<odc);
KeLowerIrql(oldIrql);
return TRUE;
}
/* HAL_RTODC() */
VOID
HalpPciReadTodc(struct todc *todp)
{
PUCHAR rtc_index = (PUCHAR) RTC_ADDR_PCIMT;
PUCHAR rtc_data = (PUCHAR) RTC_DATA_PCIMT;
HalpRead146818(todp,rtc_index,rtc_data);
}
/* HAL_WTODC() */
VOID
HalpPciWriteTodc(struct todc *todp)
{
PUCHAR rtc_index = (PUCHAR) RTC_ADDR_PCIMT;
PUCHAR rtc_data = (PUCHAR)RTC_DATA_PCIMT;
HalpWrite146818(todp, rtc_index, rtc_data);
}
VOID
HalpWrite146818(struct todc *todp, PUCHAR index, PUCHAR data)
{
UCHAR temp;
/*
* Write information to rtc146818 chip
*/
HalpWriteRegister146818(index,data,RTC_REGB,temp=(HalpReadRegister146818(index,data,RTC_REGB)|RTCB_SET));
HalpWriteRegister146818(index,data,RTC_SECS,dec_to_bcd(todp->hsecs)&MASK_SECS);
HalpWriteRegister146818(index,data,RTC_MINS,dec_to_bcd(todp->hmins)&MASK_MINS);
HalpWriteRegister146818(index,data,RTC_HOURS,dec_to_bcd(todp->hhours)&MASK_HOURS);
HalpWriteRegister146818(index,data,RTC_DAYM,dec_to_bcd(todp->hdays)&MASK_DAY_M);
HalpWriteRegister146818(index,data,RTC_DAYW,dec_to_bcd(todp->hweekday)&MASK_DAY_W);
HalpWriteRegister146818(index,data,RTC_MONTH,dec_to_bcd(todp->hmonth)&MASK_MONTH);
HalpWriteRegister146818(index,data,RTC_YEAR,dec_to_bcd(todp->hyear)&MASK_YEAR);
HalpWriteRegister146818(index,data,RTC_REGB, temp &= ~RTCB_SET);
}
VOID
HalpRead146818(struct todc *todp, PUCHAR index, PUCHAR data)
{
UCHAR temp;
HalpWriteRegister146818(index,data,RTC_REGB,temp=(HalpReadRegister146818(index,data,RTC_REGB)|RTCB_SET));
todp->htenths = 0;
todp->hsecs=bcd_to_dec(HalpReadRegister146818(index,data,RTC_SECS)&MASK_SECS);
todp->hmins=bcd_to_dec(HalpReadRegister146818(index,data,RTC_MINS)&MASK_MINS);
todp->hhours=bcd_to_dec(HalpReadRegister146818(index,data,RTC_HOURS)&MASK_HOURS);
todp->hdays=bcd_to_dec(HalpReadRegister146818(index,data,RTC_DAYM)&MASK_DAY_M);
todp->hweekday=bcd_to_dec(HalpReadRegister146818(index,data,RTC_DAYW)&MASK_DAY_W);
todp->hmonth=bcd_to_dec(HalpReadRegister146818(index,data,RTC_MONTH)&MASK_MONTH);
todp->hyear=bcd_to_dec(HalpReadRegister146818(index,data,RTC_YEAR)&MASK_YEAR);
HalpWriteRegister146818(index,data,RTC_REGB, temp &= ~RTCB_SET);
}
UCHAR
HalpReadRegister146818(PUCHAR index, PUCHAR data, int reg)
{
WRITE_REGISTER_UCHAR(index,reg);
// *index = reg;
// wbflush();
// return(*data)
return(READ_REGISTER_UCHAR(data));
}
VOID HalpWriteRegister146818(PUCHAR index, PUCHAR data, int reg, UCHAR val)
{
WRITE_REGISTER_UCHAR(index,reg);
// *index = reg;
// wbflush();
WRITE_REGISTER_UCHAR(data, val);
// *data = val;
// wbflush();
}
