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  1. 11 Dec, 2010 3 commits
    • John Stultz's avatar
      RTC: Remove UIE emulation · 042620a0
      John Stultz authored 
      Since we provide UIE interrupts via a rtc_timer, the old
emulation code can be removed.
Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
LKML Reference: <1290136329-18291-5-git-send-email-john.stultz@linaro.org>
Acked-by: default avatarAlessandro Zummo <a.zummo@towertech.it>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
CC: Alessandro Zummo <a.zummo@towertech.it>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Richard Cochran <richardcochran@gmail.com>
      042620a0
    • John Stultz's avatar
      RTC: Rework RTC code to use timerqueue for events · 6610e089
      John Stultz authored 
      This patch reworks a large portion of the generic RTC code
to in-effect virtualize the rtc interrupt code.

The current RTC interface is very much a raw hardware interface.
Via the proc, /dev/, or sysfs interfaces, applciations can set
the hardware to trigger interrupts in one of three modes:

AIE: Alarm interrupt
UIE: Update interrupt (ie: once per second)
PIE: Periodic interrupt (sub-second irqs)

The problem with this interface is that it limits the RTC hardware
so it can only be used by one application at a time.

The purpose of this patch is to extend the RTC code so that we can
multiplex multiple applications event needs onto a single RTC device.
This is done by utilizing the timerqueue infrastructure to manage
a list of events, which cause the RTC hardware to be programmed
to fire an interrupt for the next event in the list.

In order to preserve the functionality of the exsting proc,/dev/ and
sysfs interfaces, we emulate the different interrupt modes as follows:

AIE: We create a rtc_timer dedicated to AIE mode interrupts. There is
only one per device, so we don't change existing interface semantics.

UIE: Again, a dedicated rtc_timer, set for periodic mode, is used
to emulate UIE interrupts. Again, only one per device.

PIE: Since PIE mode interrupts fire faster then the RTC's clock read
granularity, we emulate PIE mode interrupts using a hrtimer. Again,
one per device.

With this patch, the rtctest.c application in Documentation/rtc.txt
passes fine on x86 hardware. However, there may very well still be
bugs, so greatly I'd appreciate any feedback or testing!
Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
LKML Reference: <1290136329-18291-4-git-send-email-john.stultz@linaro.org>
Acked-by: default avatarAlessandro Zummo <a.zummo@towertech.it>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
CC: Alessandro Zummo <a.zummo@towertech.it>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Richard Cochran <richardcochran@gmail.com>
      6610e089
    • John Stultz's avatar
      hrtimer: fix timerqueue conversion flub · b007c389
      John Stultz authored 
      In converting the hrtimers to timerqueue, I missed
a spot in hrtimer_run_queues where we loop running
timers. We end up not pulling the new next value out
and instead just use the last next value, causing
boot time hangs in some cases.

The proper fix is to pull timerqueue_getnext each iteration
instead of using a local next value.
Reported-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
      b007c389
  3. 10 Dec, 2010 3 commits
  5. 03 Dec, 2010 1 commit
    • John Stultz's avatar
      timers: Introduce timerlist infrastructure. · 87de5ac7
      John Stultz authored 
      The timerlist infrastructure is a thin layer over the rbtree
code that implements a simple list of timers sorted by an
expires value, and a getnext function that provides a pointer
to the earliest timer.

This infrastructure allows drivers and other kernel infrastructure
to easily implement timers without duplicating code.
Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
LKML Reference: <1290136329-18291-2-git-send-email-john.stultz@linaro.org>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
CC: Alessandro Zummo <a.zummo@towertech.it>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Richard Cochran <richardcochran@gmail.com>
      87de5ac7
  7. 10 Nov, 2010 1 commit
  9. 22 Oct, 2010 3 commits
  11. 21 Oct, 2010 6 commits
  13. 09 Sep, 2010 1 commit
  15. 07 Sep, 2010 22 commits
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