132 строки
3.1 KiB
C
132 строки
3.1 KiB
C
/*
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* include/asm-parisc/rtc.h
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*
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* Copyright 2002 Randolph CHung <tausq@debian.org>
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*
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* Based on: include/asm-ppc/rtc.h and the genrtc driver in the
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* 2.4 parisc linux tree
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*/
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#ifndef __ASM_RTC_H__
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#define __ASM_RTC_H__
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#ifdef __KERNEL__
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#include <linux/rtc.h>
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#include <asm/pdc.h>
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#define SECS_PER_HOUR (60 * 60)
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#define SECS_PER_DAY (SECS_PER_HOUR * 24)
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#define RTC_PIE 0x40 /* periodic interrupt enable */
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#define RTC_AIE 0x20 /* alarm interrupt enable */
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#define RTC_UIE 0x10 /* update-finished interrupt enable */
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#define RTC_BATT_BAD 0x100 /* battery bad */
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/* some dummy definitions */
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#define RTC_SQWE 0x08 /* enable square-wave output */
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#define RTC_DM_BINARY 0x04 /* all time/date values are BCD if clear */
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#define RTC_24H 0x02 /* 24 hour mode - else hours bit 7 means pm */
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#define RTC_DST_EN 0x01 /* auto switch DST - works f. USA only */
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# define __isleap(year) \
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((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
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/* How many days come before each month (0-12). */
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static const unsigned short int __mon_yday[2][13] =
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{
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/* Normal years. */
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{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
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/* Leap years. */
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{ 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
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};
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static inline unsigned int get_rtc_time(struct rtc_time *wtime)
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{
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struct pdc_tod tod_data;
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long int days, rem, y;
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const unsigned short int *ip;
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if(pdc_tod_read(&tod_data) < 0)
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return RTC_24H | RTC_BATT_BAD;
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// most of the remainder of this function is:
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// Copyright (C) 1991, 1993, 1997, 1998 Free Software Foundation, Inc.
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// This was originally a part of the GNU C Library.
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// It is distributed under the GPL, and was swiped from offtime.c
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days = tod_data.tod_sec / SECS_PER_DAY;
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rem = tod_data.tod_sec % SECS_PER_DAY;
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wtime->tm_hour = rem / SECS_PER_HOUR;
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rem %= SECS_PER_HOUR;
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wtime->tm_min = rem / 60;
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wtime->tm_sec = rem % 60;
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y = 1970;
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#define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))
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#define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))
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while (days < 0 || days >= (__isleap (y) ? 366 : 365))
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{
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/* Guess a corrected year, assuming 365 days per year. */
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long int yg = y + days / 365 - (days % 365 < 0);
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/* Adjust DAYS and Y to match the guessed year. */
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days -= ((yg - y) * 365
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+ LEAPS_THRU_END_OF (yg - 1)
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- LEAPS_THRU_END_OF (y - 1));
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y = yg;
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}
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wtime->tm_year = y - 1900;
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ip = __mon_yday[__isleap(y)];
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for (y = 11; days < (long int) ip[y]; --y)
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continue;
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days -= ip[y];
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wtime->tm_mon = y;
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wtime->tm_mday = days + 1;
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return RTC_24H;
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}
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static int set_rtc_time(struct rtc_time *wtime)
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{
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u_int32_t secs;
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secs = mktime(wtime->tm_year + 1900, wtime->tm_mon + 1, wtime->tm_mday,
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wtime->tm_hour, wtime->tm_min, wtime->tm_sec);
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if(pdc_tod_set(secs, 0) < 0)
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return -1;
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else
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return 0;
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}
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static inline unsigned int get_rtc_ss(void)
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{
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struct rtc_time h;
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get_rtc_time(&h);
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return h.tm_sec;
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}
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static inline int get_rtc_pll(struct rtc_pll_info *pll)
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{
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return -EINVAL;
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}
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static inline int set_rtc_pll(struct rtc_pll_info *pll)
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{
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return -EINVAL;
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}
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#endif /* __KERNEL__ */
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#endif /* __ASM_RTC_H__ */
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