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v850: generic timekeeping conversion 

Convert an arch that does not currently implement sub-jiffy timekeeping to
use the generic timekeeping code.

v850 looks like it has some intent to implement sub-jiffy timekeeping, so
it may not yet be appropriate to try to convert, but I figured I'd get the
maintainer's input and submit the patch for comment.

Signed-off-by: John Stultz <johnstul@us.ibm.com>
Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp>
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 2007-05-06 14:51:53 -07:00 committed by Linus Torvalds
parent c2f239d93e
commit ee17b36fd0
2 changed files with 4 additions and 75 deletions
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4
arch/v850/Kconfig
View File

@ -37,6 +37,10 @@ config GENERIC_IRQ_PROBE
bool bool
default y default y
config GENERIC_TIME
bool
default y
config TIME_LOW_RES config TIME_LOW_RES
bool bool
default y default y

75
arch/v850/kernel/time.c
View File

@ -90,81 +90,6 @@ static irqreturn_t timer_interrupt (int irq, void *dummy, struct pt_regs *regs)
return IRQ_HANDLED; return IRQ_HANDLED;
} }
/*
* This version of gettimeofday has near microsecond resolution.
*/
void do_gettimeofday (struct timeval *tv)
{
#if 0 /* DAVIDM later if possible */
extern volatile unsigned long lost_ticks;
unsigned long lost;
#endif
unsigned long flags;
unsigned long usec, sec;
unsigned long seq;
do {
seq = read_seqbegin_irqsave(&xtime_lock, flags);
#if 0
usec = mach_gettimeoffset ? mach_gettimeoffset () : 0;
#else
usec = 0;
#endif
#if 0 /* DAVIDM later if possible */
lost = lost_ticks;
if (lost)
usec += lost * (1000000/HZ);
#endif
sec = xtime.tv_sec;
usec += xtime.tv_nsec / 1000;
} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
while (usec >= 1000000) {
usec -= 1000000;
sec++;
}
tv->tv_sec = sec;
tv->tv_usec = usec;
}
EXPORT_SYMBOL(do_gettimeofday);
int do_settimeofday(struct timespec *tv)
{
if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
return -EINVAL;
write_seqlock_irq (&xtime_lock);
/* This is revolting. We need to set the xtime.tv_nsec
* correctly. However, the value in this location is
* is value at the last tick.
* Discover what correction gettimeofday
* would have done, and then undo it!
*/
#if 0
tv->tv_nsec -= mach_gettimeoffset() * 1000;
#endif
while (tv->tv_nsec < 0) {
tv->tv_nsec += NSEC_PER_SEC;
tv->tv_sec--;
}
xtime.tv_sec = tv->tv_sec;
xtime.tv_nsec = tv->tv_nsec;
ntp_clear();
write_sequnlock_irq (&xtime_lock);
clock_was_set();
return 0;
}
EXPORT_SYMBOL(do_settimeofday);
static int timer_dev_id; static int timer_dev_id;
static struct irqaction timer_irqaction = { static struct irqaction timer_irqaction = {
timer_interrupt, timer_interrupt,