path: root/include
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authorAndrew Victor <linux@maxim.org.za>2008-04-16 20:43:49 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-04-17 15:55:54 +0100
commitad48ce74f70a201c4c1cf3b4e8f6b6203a2e4a8d (patch)
tree982ac3f881a9c09115ae9b9723c343ed00dcfc8d /include
parent[ARM] 4982/1: [AT91] Drop old-style UART initialization (Part 1) (diff)
[ARM] 4989/1: [AT91] SAM9 ClockSource / ClockEvents
Update AT91SAM9/CAP9 PIT driver to use generic time and clockevent infrastructure: - Clocksource gives sub-microsecond timestamp precision, assuming memory is clocked at over 16 MHz. It's less than a 32 bit counter, unless it's is also generating IRQs. - Clockevent device supports periodic mode only; no oneshot support from this hardware. No IRQs generated unless it's the active clocksource. Later, another timer (probably from a TC module) can provide a oneshot clockevent device to get NO_HZ and High-Res-Timer behavior. This also updates the timekeeping to use the actual master clock rate on the system, instead of compile-time <asm/arch/timex.h> constants matching what Atmel's EK boards use. (Product boards may well differ!) Plus cleanup: rename "*_timer*" symbols to "*_pit*" (there are other timers, but only one PIT); shorter lines; remove needless CPP stuff; make several symbols static; etc. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Victor <linux@maxim.org.za> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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