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alpha: Convert alpha to use read/update_persistent_clock

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This patch converts the alpha 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.

igned-off-by: John Stultz <johnstul@us.ibm.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <1267675049-12337-2-git-send-email-johnstul@us.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
John Stultz 2010-03-03 19:57:16 -08:00 committed by Thomas Gleixner
parent 104f9c471f
commit 1e871be1aa
2 changed files with 50 additions and 54 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/alpha/Kconfig
View File

@ -54,6 +54,9 @@ config ARCH_USES_GETTIMEOFFSET
bool
default y
config GENERIC_CMOS_UPDATE
def_bool y
config ZONE_DMA
bool
default y

101
arch/alpha/kernel/time.c
View File

@ -75,8 +75,6 @@ static struct {
__u32 last_time;
/* ticks/cycle * 2^48 */
unsigned long scaled_ticks_per_cycle;
/* last time the CMOS clock got updated */
time_t last_rtc_update;
/* partial unused tick */
unsigned long partial_tick;
} state;
@ -91,6 +89,52 @@ static inline __u32 rpcc(void)
return result;
}
int update_persistent_clock(struct timespec now)
{
return set_rtc_mmss(now.tv_sec);
}
void read_persistent_clock(struct timespec *ts)
{
unsigned int year, mon, day, hour, min, sec, epoch;
sec = CMOS_READ(RTC_SECONDS);
min = CMOS_READ(RTC_MINUTES);
hour = CMOS_READ(RTC_HOURS);
day = CMOS_READ(RTC_DAY_OF_MONTH);
mon = CMOS_READ(RTC_MONTH);
year = CMOS_READ(RTC_YEAR);
if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
sec = bcd2bin(sec);
min = bcd2bin(min);
hour = bcd2bin(hour);
day = bcd2bin(day);
mon = bcd2bin(mon);
year = bcd2bin(year);
}
/* PC-like is standard; used for year >= 70 */
epoch = 1900;
if (year < 20)
epoch = 2000;
else if (year >= 20 && year < 48)
/* NT epoch */
epoch = 1980;
else if (year >= 48 && year < 70)
/* Digital UNIX epoch */
epoch = 1952;
printk(KERN_INFO "Using epoch = %d\n", epoch);
if ((year += epoch) < 1970)
year += 100;
ts->tv_sec = mktime(year, mon, day, hour, min, sec);
}
/*
* timer_interrupt() needs to keep up the real-time clock,
* as well as call the "do_timer()" routine every clocktick
@ -123,19 +167,6 @@ irqreturn_t timer_interrupt(int irq, void *dev)
if (nticks)
do_timer(nticks);
/*
* If we have an externally synchronized Linux clock, then update
* CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be
* called as close as possible to 500 ms before the new second starts.
*/
if (ntp_synced()
&& xtime.tv_sec > state.last_rtc_update + 660
&& xtime.tv_nsec >= 500000 - ((unsigned) TICK_SIZE) / 2
&& xtime.tv_nsec <= 500000 + ((unsigned) TICK_SIZE) / 2) {
int tmp = set_rtc_mmss(xtime.tv_sec);
state.last_rtc_update = xtime.tv_sec - (tmp ? 600 : 0);
}
write_sequnlock(&xtime_lock);
#ifndef CONFIG_SMP
@ -304,7 +335,7 @@ rpcc_after_update_in_progress(void)
void __init
time_init(void)
{
unsigned int year, mon, day, hour, min, sec, cc1, cc2, epoch;
unsigned int cc1, cc2;
unsigned long cycle_freq, tolerance;
long diff;
@ -348,43 +379,6 @@ time_init(void)
bogomips yet, but this is close on a 500Mhz box. */
__delay(1000000);
sec = CMOS_READ(RTC_SECONDS);
min = CMOS_READ(RTC_MINUTES);
hour = CMOS_READ(RTC_HOURS);
day = CMOS_READ(RTC_DAY_OF_MONTH);
mon = CMOS_READ(RTC_MONTH);
year = CMOS_READ(RTC_YEAR);
if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
sec = bcd2bin(sec);
min = bcd2bin(min);
hour = bcd2bin(hour);
day = bcd2bin(day);
mon = bcd2bin(mon);
year = bcd2bin(year);
}
/* PC-like is standard; used for year >= 70 */
epoch = 1900;
if (year < 20)
epoch = 2000;
else if (year >= 20 && year < 48)
/* NT epoch */
epoch = 1980;
else if (year >= 48 && year < 70)
/* Digital UNIX epoch */
epoch = 1952;
printk(KERN_INFO "Using epoch = %d\n", epoch);
if ((year += epoch) < 1970)
year += 100;
xtime.tv_sec = mktime(year, mon, day, hour, min, sec);
xtime.tv_nsec = 0;
wall_to_monotonic.tv_sec -= xtime.tv_sec;
wall_to_monotonic.tv_nsec = 0;
if (HZ > (1<<16)) {
extern void __you_loose (void);
@ -394,7 +388,6 @@ time_init(void)
state.last_time = cc1;
state.scaled_ticks_per_cycle
= ((unsigned long) HZ << FIX_SHIFT) / cycle_freq;
state.last_rtc_update = 0;
state.partial_tick = 0L;
/* Startup the timer source. */