[lkml]   [2004]   [Sep]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: device driver for the SGI system clock, mmtimer
    On Thursday, September 16, 2004 11:14 am, Vojtech Pavlik wrote:
    > On Thu, Sep 16, 2004 at 09:09:12AM -0700, Jesse Barnes wrote:
    > > On Thursday, September 16, 2004 9:03 am, Bjorn Helgaas wrote:
    > > > Christoph Lameter wrote:
    > > > > The timer hardware was designed around the multimedia timer
    > > > > specification by Intel but to my knowledge only SGI has implemented
    > > > > that standard. The driver was written by Jesse Barnes.
    > > >
    > > > As far as I can see, drivers/char/hpet.c talks to the same hardware.
    > > > HP sx1000 machines (and probably others) also implement the HPET.
    > >
    > > No, it's different hardware.
    > mmtimer and hpet are the same hardware actually, just a different
    > specification revision, hpet being the newer one.

    Well, the SHub RTC hardware (which mmtimer accesses) isn't really HPET or
    mmtimer hardware, but I tried to make the mmtimer *API* useful for HPET style
    hardware. The idea was to have several drivers supporting the mmtimer API
    with different hardware underneath.

    > HPET registers are MMIO so it's in theory possible, while not really
    > useful if you're using it as your system timer as well.

    I don't think anyone does this.

    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2005-03-22 14:06    [W:0.020 / U:4.292 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site