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m32r: Convert m32r to use read/update_peristent_clock
This patch converts the m32r architecture to use the generic read_persistent_clock and update_persistent_clock interfaces, reducing the amount of arch specific code we have to maintain, and allowing for further cleanups in the future. I have not built or tested this patch, so help from arch maintainers would be appreciated. Signed-off-by: John Stultz <johnstul@us.ibm.com> Cc: Hirokazu Takata <takata@linux-m32r.org> Cc: Andrew Morton <akpm@linux-foundation.org> LKML-Reference: <1267675049-12337-11-git-send-email-johnstul@us.ibm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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1 changed files with 7 additions and 40 deletions
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@ -105,24 +105,6 @@ u32 arch_gettimeoffset(void)
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return elapsed_time * 1000;
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}
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/*
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* In order to set the CMOS clock precisely, set_rtc_mmss has to be
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* called 500 ms after the second nowtime has started, because when
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* nowtime is written into the registers of the CMOS clock, it will
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* jump to the next second precisely 500 ms later. Check the Motorola
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* MC146818A or Dallas DS12887 data sheet for details.
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*
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* BUG: This routine does not handle hour overflow properly; it just
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* sets the minutes. Usually you won't notice until after reboot!
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*/
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static inline int set_rtc_mmss(unsigned long nowtime)
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{
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return 0;
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}
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/* last time the cmos clock got updated */
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static long last_rtc_update = 0;
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/*
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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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@ -138,23 +120,6 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
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#ifndef CONFIG_SMP
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update_process_times(user_mode(get_irq_regs()));
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#endif
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/*
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* If we have an externally synchronized Linux clock, then update
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* CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be
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* called as close as possible to 500 ms before the new second starts.
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*/
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write_seqlock(&xtime_lock);
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if (ntp_synced()
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&& xtime.tv_sec > last_rtc_update + 660
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&& (xtime.tv_nsec / 1000) >= 500000 - ((unsigned)TICK_SIZE) / 2
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&& (xtime.tv_nsec / 1000) <= 500000 + ((unsigned)TICK_SIZE) / 2)
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{
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if (set_rtc_mmss(xtime.tv_sec) == 0)
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last_rtc_update = xtime.tv_sec;
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else /* do it again in 60 s */
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last_rtc_update = xtime.tv_sec - 600;
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}
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write_sequnlock(&xtime_lock);
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/* As we return to user mode fire off the other CPU schedulers..
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this is basically because we don't yet share IRQ's around.
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This message is rigged to be safe on the 386 - basically it's
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@ -174,7 +139,7 @@ static struct irqaction irq0 = {
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.name = "MFT2",
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};
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void __init time_init(void)
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void read_persistent_clock(struct timespec *ts)
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{
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unsigned int epoch, year, mon, day, hour, min, sec;
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@ -194,11 +159,13 @@ void __init time_init(void)
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epoch = 1952;
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year += epoch;
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xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
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xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
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set_normalized_timespec(&wall_to_monotonic,
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-xtime.tv_sec, -xtime.tv_nsec);
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ts->tv_sec = mktime(year, mon, day, hour, min, sec);
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ts->tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
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}
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void __init time_init(void)
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{
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#if defined(CONFIG_CHIP_M32102) || defined(CONFIG_CHIP_XNUX2) \
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|| defined(CONFIG_CHIP_VDEC2) || defined(CONFIG_CHIP_M32700) \
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|| defined(CONFIG_CHIP_OPSP) || defined(CONFIG_CHIP_M32104)
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