diff options
Diffstat (limited to 'cpu')
| -rw-r--r-- | cpu/arm1136/mx31/interrupts.c | 58 |
1 files changed, 45 insertions, 13 deletions
diff --git a/cpu/arm1136/mx31/interrupts.c b/cpu/arm1136/mx31/interrupts.c index b36c58c..ab7202f 100644 --- a/cpu/arm1136/mx31/interrupts.c +++ b/cpu/arm1136/mx31/interrupts.c @@ -23,6 +23,7 @@ #include <common.h> #include <asm/arch/mx31-regs.h> +#include <div64.h> #define TIMER_BASE 0x53f90000 /* General purpose timer 1 */ @@ -38,24 +39,55 @@ #define GPTCR_CLKSOURCE_32 (4 << 6) /* Clock source */ #define GPTCR_TEN 1 /* Timer enable */ +static ulong timestamp; +static ulong lastinc; + /* "time" is measured in 1 / CONFIG_SYS_HZ seconds, "tick" is internal timer period */ #ifdef CONFIG_MX31_TIMER_HIGH_PRECISION /* ~0.4% error - measured with stop-watch on 100s boot-delay */ -#define TICK_TO_TIME(t) ((t) * CONFIG_SYS_HZ / CONFIG_MX31_CLK32) -#define TIME_TO_TICK(t) ((unsigned long long)(t) * CONFIG_MX31_CLK32 / CONFIG_SYS_HZ) -#define US_TO_TICK(t) (((unsigned long long)(t) * CONFIG_MX31_CLK32 + \ - 999999) / 1000000) +static inline unsigned long long tick_to_time(unsigned long long tick) +{ + tick *= CONFIG_SYS_HZ; + do_div(tick, CONFIG_MX31_CLK32); + return tick; +} + +static inline unsigned long long time_to_tick(unsigned long long time) +{ + time *= CONFIG_MX31_CLK32; + do_div(time, CONFIG_SYS_HZ); + return time; +} + +static inline unsigned long long us_to_tick(unsigned long long us) +{ + us = us * CONFIG_MX31_CLK32 + 999999; + do_div(us, 1000000); + return us; +} #else /* ~2% error */ #define TICK_PER_TIME ((CONFIG_MX31_CLK32 + CONFIG_SYS_HZ / 2) / CONFIG_SYS_HZ) #define US_PER_TICK (1000000 / CONFIG_MX31_CLK32) -#define TICK_TO_TIME(t) ((t) / TICK_PER_TIME) -#define TIME_TO_TICK(t) ((unsigned long long)(t) * TICK_PER_TIME) -#define US_TO_TICK(t) (((t) + US_PER_TICK - 1) / US_PER_TICK) -#endif -static ulong timestamp; -static ulong lastinc; +static inline unsigned long long tick_to_time(unsigned long long tick) +{ + do_div(tick, TICK_PER_TIME); + return tick; +} + +static inline unsigned long long time_to_tick(unsigned long long time) +{ + return time * TICK_PER_TIME; +} + +static inline unsigned long long us_to_tick(unsigned long long us) +{ + us += US_PER_TICK - 1; + do_div(us, US_PER_TICK); + return us; +} +#endif /* nothing really to do with interrupts, just starts up a counter. */ /* The 32768Hz 32-bit timer overruns in 131072 seconds */ @@ -107,7 +139,7 @@ ulong get_timer_masked (void) * 5 * 10^9 days... and get_ticks() * CONFIG_SYS_HZ wraps in * 5 * 10^6 days - long enough. */ - return TICK_TO_TIME(get_ticks()); + return tick_to_time(get_ticks()); } ulong get_timer (ulong base) @@ -117,7 +149,7 @@ ulong get_timer (ulong base) void set_timer (ulong t) { - timestamp = TIME_TO_TICK(t); + timestamp = time_to_tick(t); } /* delay x useconds AND perserve advance timstamp value */ @@ -126,7 +158,7 @@ void udelay (unsigned long usec) unsigned long long tmp; ulong tmo; - tmo = US_TO_TICK(usec); + tmo = us_to_tick(usec); tmp = get_ticks() + tmo; /* get current timestamp */ while (get_ticks() < tmp) /* loop till event */ |