diff options
author | Andrew Victor <linux@maxim.org.za> | 2008-04-16 21:43:49 +0200 |
---|---|---|
committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-04-17 16:55:54 +0200 |
commit | ad48ce74f70a201c4c1cf3b4e8f6b6203a2e4a8d (patch) | |
tree | 982ac3f881a9c09115ae9b9723c343ed00dcfc8d /include/asm-mips/mach-pnx8550 | |
parent | [ARM] 4982/1: [AT91] Drop old-style UART initialization (Part 1) (diff) | |
download | linux-ad48ce74f70a201c4c1cf3b4e8f6b6203a2e4a8d.tar.xz linux-ad48ce74f70a201c4c1cf3b4e8f6b6203a2e4a8d.zip |
[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>
Diffstat (limited to 'include/asm-mips/mach-pnx8550')
0 files changed, 0 insertions, 0 deletions