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Change to use "do_div" macro 

Signed-off-by: Tomohiro Masubuchi <tomohiro_masubuchi@tripeaks.co.jp>
This commit is contained in:
Tomohiro Masubuchi 2008-10-21 13:17:16 +09:00 committed by Jean-Christophe PLAGNIOL-VILLARD
parent e352495318
commit 26eecd24f9
1 changed files with 45 additions and 13 deletions
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58
cpu/arm1136/mx31/interrupts.c
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@ -23,6 +23,7 @@
#include <common.h> #include <common.h>
#include <asm/arch/mx31-regs.h> #include <asm/arch/mx31-regs.h>
#include <div64.h>
#define TIMER_BASE 0x53f90000 /* General purpose timer 1 */ #define TIMER_BASE 0x53f90000 /* General purpose timer 1 */
@ -38,24 +39,55 @@
#define GPTCR_CLKSOURCE_32 (4 << 6) /* Clock source */ #define GPTCR_CLKSOURCE_32 (4 << 6) /* Clock source */
#define GPTCR_TEN 1 /* Timer enable */ #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 */ /* "time" is measured in 1 / CONFIG_SYS_HZ seconds, "tick" is internal timer period */
#ifdef CONFIG_MX31_TIMER_HIGH_PRECISION #ifdef CONFIG_MX31_TIMER_HIGH_PRECISION
/* ~0.4% error - measured with stop-watch on 100s boot-delay */ /* ~0.4% error - measured with stop-watch on 100s boot-delay */
#define TICK_TO_TIME(t) ((t) * CONFIG_SYS_HZ / CONFIG_MX31_CLK32) static inline unsigned long long tick_to_time(unsigned long long tick)
#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 + \ tick *= CONFIG_SYS_HZ;
999999) / 1000000) 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 #else
/* ~2% error */ /* ~2% error */
#define TICK_PER_TIME ((CONFIG_MX31_CLK32 + CONFIG_SYS_HZ / 2) / CONFIG_SYS_HZ) #define TICK_PER_TIME ((CONFIG_MX31_CLK32 + CONFIG_SYS_HZ / 2) / CONFIG_SYS_HZ)
#define US_PER_TICK (1000000 / CONFIG_MX31_CLK32) #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 inline unsigned long long tick_to_time(unsigned long long tick)
static ulong lastinc; {
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. */ /* nothing really to do with interrupts, just starts up a counter. */
/* The 32768Hz 32-bit timer overruns in 131072 seconds */ /* 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 * 10^9 days... and get_ticks() * CONFIG_SYS_HZ wraps in
* 5 * 10^6 days - long enough. * 5 * 10^6 days - long enough.
*/ */
return TICK_TO_TIME(get_ticks()); return tick_to_time(get_ticks());
} }
ulong get_timer (ulong base) ulong get_timer (ulong base)
@ -117,7 +149,7 @@ ulong get_timer (ulong base)
void set_timer (ulong t) void set_timer (ulong t)
{ {
timestamp = TIME_TO_TICK(t); timestamp = time_to_tick(t);
} }
/* delay x useconds AND perserve advance timstamp value */ /* delay x useconds AND perserve advance timstamp value */
@ -126,7 +158,7 @@ void udelay (unsigned long usec)
unsigned long long tmp; unsigned long long tmp;
ulong tmo; ulong tmo;
tmo = US_TO_TICK(usec); tmo = us_to_tick(usec);
tmp = get_ticks() + tmo; /* get current timestamp */ tmp = get_ticks() + tmo; /* get current timestamp */
while (get_ticks() < tmp) /* loop till event */ while (get_ticks() < tmp) /* loop till event */