From: David Brownell Date: Tue, 31 Jul 2007 00:41:26 +0000 (+0100) Subject: [ARM] 4539/1: clocksource and clockevents for at91rm9200 X-Git-Tag: v2.6.24-rc1~1273^2~27 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5e802dfab7bbbee1e63607a3e6d1ceb78ec4ceeb;p=pandora-kernel.git [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 Acked-by: Bill Gatliff Acked-by:Remy Bohmer Signed-off-by: Russell King --- Reading git-diff-tree failed