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cris: convert to use arch_gettimeoffset()

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Convert cris to use GENERIC_TIME via the arch_getoffset() infrastructure,
reducing the amount of arch specific code we need to maintain.

Signed-off-by: John Stultz <johnstul@us.ibm.com>
Cc: Mikael Starvik <starvik@axis.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
john stultz 2010-03-05 13:42:31 -08:00 committed by Linus Torvalds
parent 56e6943b41
commit ba875ba6b7
2 changed files with 8 additions and 66 deletions
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6
arch/cris/Kconfig
View File

@ -20,6 +20,12 @@ config RWSEM_GENERIC_SPINLOCK
config RWSEM_XCHGADD_ALGORITHM
bool
config GENERIC_TIME
def_bool y
config ARCH_USES_GETTIMEOFFSET
def_bool y
config GENERIC_IOMAP
bool
default y

68
arch/cris/kernel/time.c
View File

@ -42,75 +42,11 @@ unsigned long loops_per_usec;
extern unsigned long do_slow_gettimeoffset(void);
static unsigned long (*do_gettimeoffset)(void) = do_slow_gettimeoffset;
/*
* This version of gettimeofday has near microsecond resolution.
*
* Note: Division is quite slow on CRIS and do_gettimeofday is called
* rather often. Maybe we should do some kind of approximation here
* (a naive approximation would be to divide by 1024).
*/
void do_gettimeofday(struct timeval *tv)
u32 arch_gettimeoffset(void)
{
unsigned long flags;
signed long usec, sec;
local_irq_save(flags);
usec = do_gettimeoffset();
/*
* If time_adjust is negative then NTP is slowing the clock
* so make sure not to go into next possible interval.
* Better to lose some accuracy than have time go backwards..
*/
if (unlikely(time_adjust < 0) && usec > tickadj)
usec = tickadj;
sec = xtime.tv_sec;
usec += xtime.tv_nsec / 1000;
local_irq_restore(flags);
while (usec >= 1000000) {
usec -= 1000000;
sec++;
}
tv->tv_sec = sec;
tv->tv_usec = usec;
return do_gettimeoffset() * 1000;
}
EXPORT_SYMBOL(do_gettimeofday);
int do_settimeofday(struct timespec *tv)
{
time_t wtm_sec, sec = tv->tv_sec;
long wtm_nsec, nsec = tv->tv_nsec;
if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
return -EINVAL;
write_seqlock_irq(&xtime_lock);
/*
* This is revolting. We need to set "xtime" correctly. However, the
* value in this location is the value at the most recent update of
* wall time. Discover what correction gettimeofday() would have
* made, and then undo it!
*/
nsec -= do_gettimeoffset() * NSEC_PER_USEC;
wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
set_normalized_timespec(&xtime, sec, nsec);
set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
ntp_clear();
write_sequnlock_irq(&xtime_lock);
clock_was_set();
return 0;
}
EXPORT_SYMBOL(do_settimeofday);
/*
* BUG: This routine does not handle hour overflow properly; it just
* sets the minutes. Usually you'll only notice that after reboot!