tree fded2593c6d7e7a8e72728601573c6db7ceaa115
parent fd6480f27e38f86ddea78eb5b46db249dfd09f17
author Adam Brooks <[EMAIL PROTECTED]> Wed, 07 Sep 2005 17:24:36 +0100
committer Russell King <[EMAIL PROTECTED]> Wed, 07 Sep 2005 17:24:36 +0100
[ARM] 2871/1: Fixes an issue with gettimeofday not working correctly on Intel
IOP3xx processors
Patch from Adam Brooks
The current gettimeofday implementation for the IOP3xx processors reads the
contents of the timer interrupt register and does math on the value to figure
out exactly what time it is. To do this it multiplies the contents of the
timer register with a large constant. The result is then divided by a large
constant. Unfortunately the result of the first multiplication is often too
large for the register to hold. The solution is to combine the two large
constants to a single smaller constant at compile time. Then the timer value
can be divided by single smaller constant without any overflow issues.
Signed-off-by: Adam Brooks <[EMAIL PROTECTED]>
Signed-off-by: Deepak Saxena <[EMAIL PROTECTED]>
Signed-off-by: Russell King <[EMAIL PROTECTED]>
arch/arm/mach-iop3xx/iop321-time.c | 2 +-
arch/arm/mach-iop3xx/iop331-time.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-iop3xx/iop321-time.c
b/arch/arm/mach-iop3xx/iop321-time.c
--- a/arch/arm/mach-iop3xx/iop321-time.c
+++ b/arch/arm/mach-iop3xx/iop321-time.c
@@ -60,7 +60,7 @@ static unsigned long iop321_gettimeoffse
/*
* Now convert them to usec.
*/
- usec = (unsigned long)(elapsed * (tick_nsec / 1000)) / LATCH;
+ usec = (unsigned long)(elapsed / (CLOCK_TICK_RATE/1000000));
return usec;
}
diff --git a/arch/arm/mach-iop3xx/iop331-time.c
b/arch/arm/mach-iop3xx/iop331-time.c
--- a/arch/arm/mach-iop3xx/iop331-time.c
+++ b/arch/arm/mach-iop3xx/iop331-time.c
@@ -58,7 +58,7 @@ static unsigned long iop331_gettimeoffse
/*
* Now convert them to usec.
*/
- usec = (unsigned long)(elapsed * (tick_nsec / 1000)) / LATCH;
+ usec = (unsigned long)(elapsed / (CLOCK_TICK_RATE/1000000));
return usec;
}
-
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