/*
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/*
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* linux/arch/arm/kernel/time.c
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* linux/arch/arm/kernel/time.c
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*
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*
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* Copyright (C) 1991, 1992, 1995 Linus Torvalds
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* Copyright (C) 1991, 1992, 1995 Linus Torvalds
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* Modifications for ARM (C) 1994, 1995, 1996,1997 Russell King
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* Modifications for ARM (C) 1994, 1995, 1996,1997 Russell King
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*
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*
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* This file contains the ARM-specific time handling details:
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* This file contains the ARM-specific time handling details:
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* reading the RTC at bootup, etc...
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* reading the RTC at bootup, etc...
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*
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*
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* 1994-07-02 Alan Modra
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* 1994-07-02 Alan Modra
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* fixed set_rtc_mmss, fixed time.year for >= 2000, new mktime
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* fixed set_rtc_mmss, fixed time.year for >= 2000, new mktime
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* 1997-09-10 Updated NTP code according to technical memorandum Jan '96
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* 1997-09-10 Updated NTP code according to technical memorandum Jan '96
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* "A Kernel Model for Precision Timekeeping" by Dave Mills
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* "A Kernel Model for Precision Timekeeping" by Dave Mills
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*/
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*/
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#include <linux/errno.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/kernel.h>
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#include <linux/param.h>
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#include <linux/param.h>
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#include <linux/string.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/interrupt.h>
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#include <asm/segment.h>
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#include <asm/segment.h>
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#include <asm/io.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/irq.h>
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#include <linux/timex.h>
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#include <linux/timex.h>
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#include <asm/hardware.h>
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#include <asm/hardware.h>
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#ifndef BCD_TO_BIN
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#ifndef BCD_TO_BIN
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#define BCD_TO_BIN(val) ((val)=((val)&15) + ((val)>>4)*10)
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#define BCD_TO_BIN(val) ((val)=((val)&15) + ((val)>>4)*10)
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#endif
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#endif
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#ifndef BIN_TO_BCD
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#ifndef BIN_TO_BCD
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#define BIN_TO_BCD(val) ((val)=(((val)/10)<<4) + (val)%10)
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#define BIN_TO_BCD(val) ((val)=(((val)/10)<<4) + (val)%10)
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#endif
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#endif
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#define DEBUG 1
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#define DEBUG 1
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/* Converts Gregorian date to seconds since 1970-01-01 00:00:00.
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/* Converts Gregorian date to seconds since 1970-01-01 00:00:00.
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* Assumes input in normal date format, i.e. 1980-12-31 23:59:59
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* Assumes input in normal date format, i.e. 1980-12-31 23:59:59
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* => year=1980, mon=12, day=31, hour=23, min=59, sec=59.
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* => year=1980, mon=12, day=31, hour=23, min=59, sec=59.
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*
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*
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* [For the Julian calendar (which was used in Russia before 1917,
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* [For the Julian calendar (which was used in Russia before 1917,
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* Britain & colonies before 1752, anywhere else before 1582,
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* Britain & colonies before 1752, anywhere else before 1582,
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* and is still in use by some communities) leave out the
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* and is still in use by some communities) leave out the
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* -year/100+year/400 terms, and add 10.]
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* -year/100+year/400 terms, and add 10.]
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*
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*
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* This algorithm was first published by Gauss (I think).
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* This algorithm was first published by Gauss (I think).
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*
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*
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* WARNING: this function will overflow on 2106-02-07 06:28:16 on
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* WARNING: this function will overflow on 2106-02-07 06:28:16 on
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* machines were long is 32-bit! (However, as time_t is signed, we
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* machines were long is 32-bit! (However, as time_t is signed, we
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* will already get problems at other places on 2038-01-19 03:14:08)
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* will already get problems at other places on 2038-01-19 03:14:08)
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*/
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*/
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static inline unsigned long mktime(unsigned int year, unsigned int mon,
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static inline unsigned long mktime(unsigned int year, unsigned int mon,
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unsigned int day, unsigned int hour,
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unsigned int day, unsigned int hour,
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unsigned int min, unsigned int sec)
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unsigned int min, unsigned int sec)
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{
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{
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if (0 >= (int) (mon -= 2)) { /* 1..12 -> 11,12,1..10 */
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if (0 >= (int) (mon -= 2)) { /* 1..12 -> 11,12,1..10 */
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mon += 12; /* Puts Feb last since it has leap day */
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mon += 12; /* Puts Feb last since it has leap day */
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year -= 1;
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year -= 1;
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}
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}
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return (((
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return (((
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(unsigned long)(year/4 - year/100 + year/400 + 367*mon/12 + day) +
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(unsigned long)(year/4 - year/100 + year/400 + 367*mon/12 + day) +
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year*365 - 719499
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year*365 - 719499
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)*24 + hour /* now have hours */
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)*24 + hour /* now have hours */
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)*60 + min /* now have minutes */
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)*60 + min /* now have minutes */
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)*60 + sec; /* finally seconds */
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)*60 + sec; /* finally seconds */
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}
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}
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#include <asm/arch/time.h>
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#include <asm/arch/time.h>
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static unsigned long do_gettimeoffset(void)
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static unsigned long do_gettimeoffset(void)
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{
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{
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return gettimeoffset ();
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return gettimeoffset ();
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}
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}
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void do_gettimeofday(struct timeval *tv)
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void do_gettimeofday(struct timeval *tv)
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{
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{
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unsigned long flags;
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unsigned long flags;
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save_flags_cli (flags);
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save_flags_cli (flags);
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*tv = xtime;
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*tv = xtime;
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tv->tv_usec += do_gettimeoffset();
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tv->tv_usec += do_gettimeoffset();
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if (tv->tv_usec >= 1000000) {
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if (tv->tv_usec >= 1000000) {
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tv->tv_usec -= 1000000;
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tv->tv_usec -= 1000000;
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tv->tv_sec++;
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tv->tv_sec++;
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}
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}
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restore_flags(flags);
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restore_flags(flags);
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}
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}
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void do_settimeofday(struct timeval *tv)
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void do_settimeofday(struct timeval *tv)
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{
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{
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cli ();
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cli ();
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/* This is revolting. We need to set the xtime.tv_usec
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/* This is revolting. We need to set the xtime.tv_usec
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* correctly. However, the value in this location is
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* correctly. However, the value in this location is
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* is value at the last tick.
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* is value at the last tick.
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* Discover what correction gettimeofday
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* Discover what correction gettimeofday
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* would have done, and then undo it!
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* would have done, and then undo it!
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*/
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*/
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tv->tv_usec -= do_gettimeoffset();
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tv->tv_usec -= do_gettimeoffset();
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if (tv->tv_usec < 0) {
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if (tv->tv_usec < 0) {
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tv->tv_usec += 1000000;
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tv->tv_usec += 1000000;
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tv->tv_sec--;
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tv->tv_sec--;
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}
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}
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xtime = *tv;
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xtime = *tv;
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time_adjust = 0; /* stop active adjtime() */
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time_adjust = 0; /* stop active adjtime() */
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time_status |= STA_UNSYNC;
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time_status |= STA_UNSYNC;
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time_state = TIME_ERROR; /* p. 24, (a) */
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time_state = TIME_ERROR; /* p. 24, (a) */
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time_maxerror = NTP_PHASE_LIMIT;
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time_maxerror = NTP_PHASE_LIMIT;
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time_esterror = NTP_PHASE_LIMIT;
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time_esterror = NTP_PHASE_LIMIT;
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sti ();
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sti ();
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}
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}
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/*
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/*
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* timer_interrupt() needs to keep up the real-time clock,
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* timer_interrupt() needs to keep up the real-time clock,
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* as well as call the "do_timer()" routine every clocktick.
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* as well as call the "do_timer()" routine every clocktick.
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*/
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*/
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static void timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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static void timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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{
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{
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if (reset_timer ())
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if (reset_timer ())
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do_timer(regs);
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do_timer(regs);
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update_rtc ();
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update_rtc ();
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}
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}
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static struct irqaction irqtimer1 = { timer_interrupt, 0, 0, "timer", NULL, NULL};
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static struct irqaction irqtimer1 = { timer_interrupt, 0, 0, "timer", NULL, NULL};
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extern int setup_arm_irq(int, struct irqaction *);
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extern int setup_arm_irq(int, struct irqaction *);
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#ifdef DEBUG
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#ifdef DEBUG
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unsigned long arch_setup_timer (void)
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unsigned long arch_setup_timer (void)
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{
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{
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register volatile struct trio_timers* tt = (struct trio_timers*) (PERIPH_BASE+TC_OFFSET);
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register volatile struct trio_timers* tt = (struct trio_timers*) (PERIPH_BASE+TC_OFFSET);
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register volatile struct trio_timer_channel* tc = &tt->chans[1].ch;
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register volatile struct trio_timer_channel* tc = &tt->chans[1].ch;
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unsigned long v;
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unsigned long v;
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/* program NO signal on XC1 */
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/* program NO signal on XC1 */
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v = tt->bcr;
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v = tt->bcr;
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v = (v & ~(3 << 2)) | (1 << 2);
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v = (v & ~(3 << 2)) | (1 << 2);
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tt->bcr = v;
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tt->bcr = v;
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tc->ccr = 0x20; /* disable the channel */
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tc->ccr = 0x20; /* disable the channel */
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/* select ACLK/128 as inupt frequensy for TC1 and enable CPCTRG */
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/* select ACLK/128 as inupt frequensy for TC1 and enable CPCTRG */
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tc->cmr = 3 | (1 << 14);
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tc->cmr = 3 | (1 << 14);
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tc->idr = ~0ul; /* disable all interrupt */
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tc->idr = ~0ul; /* disable all interrupt */
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tc->rc = ((ARM_CLK/128)/HZ - 1); /* load the count limit into the CR register */
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tc->rc = ((ARM_CLK/128)/HZ - 1); /* load the count limit into the CR register */
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tc->ier = TC_CPCS; /* enable CPCS interrupt */
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tc->ier = TC_CPCS; /* enable CPCS interrupt */
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/* enable the channel */
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/* enable the channel */
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tc->ccr = TC_SWTRG|TC_CLKEN;
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tc->ccr = TC_SWTRG|TC_CLKEN;
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return mktime(1999, 11, 1, 0, 0, 0);
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return mktime(1999, 11, 1, 0, 0, 0);
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}
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}
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#define setup_timer arch_setup_timer
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#define setup_timer arch_setup_timer
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#endif
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#endif
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void time_init(void)
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void time_init(void)
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{
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{
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xtime.tv_sec = setup_timer();
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xtime.tv_sec = setup_timer();
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xtime.tv_usec = 0;
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xtime.tv_usec = 0;
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setup_arm_irq(IRQ_TC1, &irqtimer1);
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setup_arm_irq(IRQ_TC1, &irqtimer1);
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}
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}
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