diff options
Diffstat (limited to 'cpu/at91rm9200/interrupts.c')
| -rw-r--r-- | cpu/at91rm9200/interrupts.c | 26 |
1 files changed, 19 insertions, 7 deletions
diff --git a/cpu/at91rm9200/interrupts.c b/cpu/at91rm9200/interrupts.c index d3adc43..1c071bb 100644 --- a/cpu/at91rm9200/interrupts.c +++ b/cpu/at91rm9200/interrupts.c @@ -37,8 +37,8 @@ extern void reset_cpu(ulong addr); -/* we always count down the max. */ -#define TIMER_LOAD_VAL 0xffff +/* the number of clocks per CFG_HZ */ +#define TIMER_LOAD_VAL (CFG_HZ_CLOCK/CFG_HZ) /* macro to read the 16 bit timer */ #define READ_TIMER (tmr->TC_CV & 0x0000ffff) @@ -165,11 +165,13 @@ int interrupt_init (void) *AT91C_TCB0_BCR = 0; *AT91C_TCB0_BMR = AT91C_TCB_TC0XC0S_NONE | AT91C_TCB_TC1XC1S_NONE | AT91C_TCB_TC2XC2S_NONE; tmr->TC_CCR = AT91C_TC_CLKDIS; - tmr->TC_CMR = AT91C_TC_TIMER_DIV1_CLOCK; /* set to MCLK/2 */ +#define AT91C_TC_CMR_CPCTRG (1 << 14) + /* set to MCLK/2 and restart the timer when the vlaue in TC_RC is reached */ + tmr->TC_CMR = AT91C_TC_TIMER_DIV1_CLOCK | AT91C_TC_CMR_CPCTRG; tmr->TC_IDR = ~0ul; tmr->TC_RC = TIMER_LOAD_VAL; - lastinc = TIMER_LOAD_VAL; + lastinc = 0; tmr->TC_CCR = AT91C_TC_SWTRG | AT91C_TC_CLKEN; timestamp = 0; @@ -207,7 +209,7 @@ void reset_timer_masked (void) timestamp = 0; } -ulong get_timer_masked (void) +ulong get_timer_raw (void) { ulong now = READ_TIMER; @@ -223,17 +225,27 @@ ulong get_timer_masked (void) return timestamp; } +ulong get_timer_masked (void) +{ + return get_timer_raw()/TIMER_LOAD_VAL; +} + void udelay_masked (unsigned long usec) { ulong tmo; +#if 0 /* doesn't work for usec < 1000 */ tmo = usec / 1000; - tmo *= CFG_HZ; + tmo *= CFG_HZ_CLOCK; +#else + tmo = CFG_HZ_CLOCK / 1000; + tmo *= usec; +#endif tmo /= 1000; reset_timer_masked (); - while (get_timer_masked () < tmo) + while (get_timer_raw () < tmo) /*NOP*/; } |