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| author | Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> | 2009-02-24 06:13:10 +0100 |
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| committer | Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> | 2009-03-09 12:01:32 +0100 |
| commit | a922fdb87af25c25c032424908dcf60fbf3250ea (patch) | |
| tree | 2bfb26a67c32c4a336d0596e38785776faa9b08c | |
| parent | 014c595f12d4f7e14cb10188f856465b2d41718f (diff) | |
| download | u-boot-imx-a922fdb87af25c25c032424908dcf60fbf3250ea.zip u-boot-imx-a922fdb87af25c25c032424908dcf60fbf3250ea.tar.gz u-boot-imx-a922fdb87af25c25c032424908dcf60fbf3250ea.tar.bz2 | |
PXA: timer use do_div and simplify it
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
| -rw-r--r-- | cpu/pxa/interrupts.c | 46 |
1 files changed, 24 insertions, 22 deletions
diff --git a/cpu/pxa/interrupts.c b/cpu/pxa/interrupts.c index 40d8bf2..2bc5c50 100644 --- a/cpu/pxa/interrupts.c +++ b/cpu/pxa/interrupts.c @@ -28,6 +28,7 @@ #include <common.h> #include <asm/arch/pxa-regs.h> +#include <div64.h> #ifdef CONFIG_USE_IRQ #error: interrupts not implemented yet @@ -41,6 +42,20 @@ #error "Timer frequency unknown - please config PXA CPU type" #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) { /* nothing happens here - we don't setup any IRQs */ @@ -75,33 +90,20 @@ void reset_timer_masked (void) ulong get_timer_masked (void) { - unsigned long long ticks = get_ticks(); - - return (((ticks / TIMER_FREQ_HZ) * 1000) + - ((ticks % TIMER_FREQ_HZ) * 1000) / TIMER_FREQ_HZ); + return tick_to_time(get_ticks()); } void udelay_masked (unsigned long usec) { + unsigned long long tmp; ulong tmo; - ulong endtime; - signed long diff; - - if (usec >= 1000) { - tmo = usec / 1000; - tmo *= TIMER_FREQ_HZ; - tmo /= 1000; - } else { - tmo = usec * TIMER_FREQ_HZ; - tmo /= (1000*1000); - } - - endtime = get_ticks() + tmo; - - do { - ulong now = get_ticks(); - diff = endtime - now; - } while (diff >= 0); + + tmo = us_to_tick(usec); + tmp = get_ticks() + tmo; /* get current timestamp */ + + while (get_ticks() < tmp) /* loop till event */ + /*NOP*/; + } /* |