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    • David Brownell's avatar
      [ARM] 4539/1: clocksource and clockevents for at91rm9200 · 5e802dfa
      David Brownell authored
      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: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
      Acked-by: default avatarBill Gatliff <bgat@billgatliff.com>
      Acked-by: default avatarRemy Bohmer <linux@bohmer.net>
      Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      5e802dfa
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