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authorDavid Brownell <david-b@pacbell.net>2007-07-31 01:41:26 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2007-10-12 23:43:15 +0100
commit5e802dfab7bbbee1e63607a3e6d1ceb78ec4ceeb (patch)
treeeb85a0c5746afae2c6ca0959bb9c58caf83351eb /include/asm-um/unistd.h
parentf2c10d6c669e5b792c48e86da37ec7fde0a2e302 (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 'include/asm-um/unistd.h')
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