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PXA: timer use do_div and simplify it

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Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD 2009-02-24 06:13:10 +01:00
parent 014c595f12
commit a922fdb87a
1 changed files with 21 additions and 19 deletions
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40
cpu/pxa/interrupts.c
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@ -28,6 +28,7 @@
#include <common.h> #include <common.h>
#include <asm/arch/pxa-regs.h> #include <asm/arch/pxa-regs.h>
#include <div64.h>
#ifdef CONFIG_USE_IRQ #ifdef CONFIG_USE_IRQ
#error: interrupts not implemented yet #error: interrupts not implemented yet
@ -41,6 +42,20 @@
#error "Timer frequency unknown - please config PXA CPU type" #error "Timer frequency unknown - please config PXA CPU type"
#endif #endif
static inline unsigned long long tick_to_time(unsigned long long tick)
{
tick *= CONFIG_SYS_HZ;
do_div(tick, TIMER_FREQ_HZ);
return tick;
}
static inline unsigned long long us_to_tick(unsigned long long us)
{
us = us * TIMER_FREQ_HZ + 999999;
do_div(us, 1000000);
return us;
}
int interrupt_init (void) int interrupt_init (void)
{ {
/* nothing happens here - we don't setup any IRQs */ /* nothing happens here - we don't setup any IRQs */
@ -75,33 +90,20 @@ void reset_timer_masked (void)
ulong get_timer_masked (void) ulong get_timer_masked (void)
{ {
unsigned long long ticks = get_ticks(); return tick_to_time(get_ticks());
return (((ticks / TIMER_FREQ_HZ) * 1000) +
((ticks % TIMER_FREQ_HZ) * 1000) / TIMER_FREQ_HZ);
} }
void udelay_masked (unsigned long usec) void udelay_masked (unsigned long usec)
{ {
unsigned long long tmp;
ulong tmo; ulong tmo;
ulong endtime;
signed long diff;
if (usec >= 1000) { tmo = us_to_tick(usec);
tmo = usec / 1000; tmp = get_ticks() + tmo; /* get current timestamp */
tmo *= TIMER_FREQ_HZ;
tmo /= 1000;
} else {
tmo = usec * TIMER_FREQ_HZ;
tmo /= (1000*1000);
}
endtime = get_ticks() + tmo; while (get_ticks() < tmp) /* loop till event */
/*NOP*/;
do {
ulong now = get_ticks();
diff = endtime - now;
} while (diff >= 0);
} }
/* /*