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ep93xx: Fix calculation of sys ticks in clk_to_systicks()

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ep93xx: Use unsigned long long for calculation of sys ticks in clk_to_systicks()
for proper handling of large intermediate values

Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>
This commit is contained in:
Matthias Kaehlcke 2010-02-24 00:22:00 +01:00 committed by Tom Rix
parent 041d42e789
commit d9f505e3cd
1 changed files with 4 additions and 2 deletions
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6
cpu/arm920t/ep93xx/timer.c
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@ -31,6 +31,7 @@
#include <linux/types.h> #include <linux/types.h>
#include <asm/arch/ep93xx.h> #include <asm/arch/ep93xx.h>
#include <asm/io.h> #include <asm/io.h>
#include <div64.h>
#define TIMER_CLKSEL (1 << 3) #define TIMER_CLKSEL (1 << 3)
#define TIMER_MODE (1 << 6) #define TIMER_MODE (1 << 6)
@ -44,9 +45,10 @@ static ulong lastdec;
static inline unsigned long clk_to_systicks(unsigned long clk_ticks) static inline unsigned long clk_to_systicks(unsigned long clk_ticks)
{ {
unsigned long sys_ticks = (clk_ticks * CONFIG_SYS_HZ) / TIMER_FREQ; unsigned long long sys_ticks = (clk_ticks * CONFIG_SYS_HZ);
do_div(sys_ticks, TIMER_FREQ);
return sys_ticks; return (unsigned long)sys_ticks;
} }
static inline unsigned long usecs_to_ticks(unsigned long usecs) static inline unsigned long usecs_to_ticks(unsigned long usecs)