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