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[PATCH] Fix IXP4xx CLOCK_TICK_RATE

As pointed out in the following thread, the CLOCK_TICK_RATE setting for
IXP4xx is incorrect b/c the HW ignores the lowest 2 bits of the LATCH
value.

http://lists.arm.linux.org.uk/pipermail/linux-arm-kernel/2005-August/030950.html

Tnx to George Anziger and Egil Hjelmeland for finding the issue.

Signed-off-by: Deepak Saxena <dsaxena@plexity.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

authored by

Deepak Saxena and committed by
Linus Torvalds 9138dccb d10689b6

+4 -2
+4 -2
include/asm-arm/arch-ixp4xx/timex.h
··· 7 7 8 8 /* 9 9 * We use IXP425 General purpose timer for our timer needs, it runs at 10 - * 66.66... MHz 10 + * 66.66... MHz. We do a convulted calculation of CLOCK_TICK_RATE b/c the 11 + * timer register ignores the bottom 2 bits of the LATCH value. 11 12 */ 12 - #define CLOCK_TICK_RATE (66666666) 13 + #define FREQ 66666666 14 + #define CLOCK_TICK_RATE (((FREQ / HZ & ~IXP4XX_OST_RELOAD_MASK) + 1) * HZ) 13 15