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| author |   Andrew Victor <linux@maxim.org.za> | 2008-04-16 20:43:49 +0100 |
|---|---|---|
| committer |   Russell King <rmk+kernel@arm.linux.org.uk> | 2008-04-17 15:55:54 +0100 |
| commit | ad48ce74f70a201c4c1cf3b4e8f6b6203a2e4a8d (patch) | |
| tree | 982ac3f881a9c09115ae9b9723c343ed00dcfc8d /arch/arm/mach-at91/Kconfig | |
| parent | [ARM] 4982/1: [AT91] Drop old-style UART initialization (Part 1) (diff) | |
| download | linux-dev-ad48ce74f70a201c4c1cf3b4e8f6b6203a2e4a8d.tar.xz linux-dev-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 'arch/arm/mach-at91/Kconfig')
| -rw-r--r-- | arch/arm/mach-at91/Kconfig | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig index 8a9f67b62ec1..0fc07b6db749 100644 --- a/arch/arm/mach-at91/Kconfig +++ b/arch/arm/mach-at91/Kconfig @@ -12,18 +12,28 @@ config ARCH_AT91RM9200 config ARCH_AT91SAM9260 bool "AT91SAM9260 or AT91SAM9XE" + select GENERIC_TIME + select GENERIC_CLOCKEVENTS config ARCH_AT91SAM9261 bool "AT91SAM9261" + select GENERIC_TIME + select GENERIC_CLOCKEVENTS config ARCH_AT91SAM9263 bool "AT91SAM9263" + select GENERIC_TIME + select GENERIC_CLOCKEVENTS config ARCH_AT91SAM9RL bool "AT91SAM9RL" + select GENERIC_TIME + select GENERIC_CLOCKEVENTS config ARCH_AT91CAP9 bool "AT91CAP9" + select GENERIC_TIME + select GENERIC_CLOCKEVENTS config ARCH_AT91X40 bool "AT91x40" |