Mirrors/u-boot
2
0
Fork 0
mirror of https://github.com/AsahiLinux/u-boot synced 2025-01-25 03:15:17 +00:00
Code Issues Projects Releases Packages Wiki Activity

ep93xx timer: Fix possible overflow in usecs_to_ticks()

Browse source 
ep93xx timer: Use 64-bit values in usecs_to_ticks() in order to avoid
overflows in intermediate values

Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>
This commit is contained in:
Matthias Kaehlcke 2010-03-09 22:13:20 +01:00 committed by trix
parent 8d9ba7507f
commit 39ecbfcce0
1 changed files with 4 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

16
cpu/arm920t/ep93xx/timer.c
View file

@ -36,7 +36,7 @@
#define TIMER_CLKSEL (1 << 3)
#define TIMER_ENABLE (1 << 7)
#define TIMER_FREQ 508469
#define TIMER_FREQ 508469 /* ticks / second */
#define TIMER_MAX_VAL 0xFFFFFFFF
static struct ep93xx_timer
@ -53,18 +53,10 @@ static inline unsigned long clk_to_systicks(unsigned long long clk_ticks)
return (unsigned long)sys_ticks;
}
static inline unsigned long usecs_to_ticks(unsigned long usecs)
static inline unsigned long long usecs_to_ticks(unsigned long usecs)
{
unsigned long ticks;
if (usecs >= 1000) {
ticks = usecs / 1000;
ticks *= TIMER_FREQ;
ticks /= 1000;
} else {
ticks = usecs * TIMER_FREQ;
ticks /= (1000 * 1000);
}
unsigned long long ticks = (unsigned long long)usecs * TIMER_FREQ;
do_div(ticks, 1000 * 1000);
return ticks;
}