diff options
| author | David Brownell <david-b@pacbell.net> | 2007-07-31 01:41:26 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2007-10-12 23:43:15 +0100 |
| commit | 5e802dfab7bbbee1e63607a3e6d1ceb78ec4ceeb (patch) | |
| tree | eb85a0c5746afae2c6ca0959bb9c58caf83351eb /arch/arm/mach-at91/Kconfig | |
| parent | f2c10d6c669e5b792c48e86da37ec7fde0a2e302 (diff) | |
[ARM] 4539/1: clocksource and clockevents for at91rm9200
GENERIC_TIME and GENERIC_CLOCKEVENTS support for the at91rm9200.
- Oneshot mode (used for NO_HZ and high res timers) uses the
alarm to emulate a real oneshot timer; the trickiest bit is
how to avoid some lowlevel races. Thanks to Remy Bohmer for
various fixes to this code.
- Tighten up periodic mode support using the PIT.
- Streamline reads of the 32KHz counter. Thanks to Marc Pignat
for some testing results: the CRTR register has *very* odd
behavior. The reread appears to work around stranger glitches
than just getting an old clock value (which would quickly
self-correct).
- Remove the rounding-up of tick_usec to 10.009 msec (32KiHz/100),
since that no longer acts correct (time increases too fast).
Note that the at91sam9 and at91x40 chips need other solutions,
since they don't have the same system timer module.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Bill Gatliff <bgat@billgatliff.com>
Acked-by:Remy Bohmer <linux@bohmer.net>
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 | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig index fd956f1299d..05a9f8a1b45 100644 --- a/arch/arm/mach-at91/Kconfig +++ b/arch/arm/mach-at91/Kconfig @@ -7,6 +7,8 @@ choice config ARCH_AT91RM9200 bool "AT91RM9200" + select GENERIC_TIME + select GENERIC_CLOCKEVENTS config ARCH_AT91SAM9260 bool "AT91SAM9260 or AT91SAM9XE" |