1. 02 May, 2009 2 commits
    • john stultz's avatar
      timekeeping: create arch_gettimeoffset infrastructure · 7d27558c
      john stultz authored
      Some arches don't supply their own clocksource. This is mainly the
      case in architectures that get their inter-tick times by reading the
      counter on their interval timer.  Since these timers wrap every tick,
      they're not really useful as clocksources.  Wrapping them to act like
      one is possible but not very efficient. So we provide a callout these
      arches can implement for use with the jiffies clocksource to provide
      finer then tick granular time.
      
      [ Impact: ease the migration to generic time keeping ]
      Signed-off-by: default avatarJohn Stultz <johnstul@us.ibm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      7d27558c
    • Magnus Damm's avatar
      clocksource: setup mult_orig in clocksource_enable() · a25cbd04
      Magnus Damm authored
      Setup clocksource mult_orig in clocksource_enable().
      
      Clocksource drivers can save power by using keeping the
      device clock disabled while the clocksource is unused.
      
      In practice this means that the enable() and disable()
      callbacks perform clk_enable() and clk_disable().
      
      The enable() callback may also use clk_get_rate() to get
      the clock rate from the clock framework. This information
      can then be used to calculate the shift and mult variables.
      
      Currently the mult_orig variable is setup from mult at
      registration time only. This is conflicting with the above
      case since the clock is disabled and the mult variable is
      not yet calculated at the time of registration.
      
      Moving the mult_orig setup code to clocksource_enable()
      allows us to both handle the common case with no enable()
      callback and the mult-changed-after-enable() case.
      
      [ Impact: allow dynamic clock source usage ]
      Signed-off-by: default avatarMagnus Damm <damm@igel.co.jp>
      LKML-Reference: <20090501054546.8193.10688.sendpatchset@rx1.opensource.se>
      Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      a25cbd04
  2. 30 Apr, 2009 3 commits
  3. 29 Apr, 2009 16 commits
  4. 28 Apr, 2009 19 commits