• Tkhai Kirill's avatar
    sparc32: generic clockevent support · 62f08283
    Tkhai Kirill authored
    The kernel uses l14 timers as clockevents. l10 timer is used
    as clocksource if platform master_l10_counter isn't constantly
    zero. The clocksource is continuous, so it's possible to use
    high resolution timers. l10 timer is also used as clockevent
    on UP configurations.
    This realization is for sun4m, sun4d, sun4c, microsparc-IIep
    and LEON platforms. The appropriate LEON changes was made by
    Konrad Eisele.
    In case of sun4m's oneshot mode, profile irq is zeroed in
    smp4m_percpu_timer_interrupt(). It is maybe
    needless (double, triple etc overflow does nothing).
    sun4d is able to have oneshot mode too, but I haven't
    any way to test it. So code of its percpu timer handler
    is made as much equal to the current code as possible.
    The patch is tested on sun4m box in SMP mode by me,
    and tested by Konrad on leon in up mode (leon smp
    is broken atm - due to other reasons).
    Signed-off-by: default avatarTkhai Kirill <tkhai@yandex.ru>
    Tested-by: Konrad Eisele <konrad@gaisler.com> [leon up]
    [sam: revised patch to provide generic support for leon]
    Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
leon_kernel.c 14.4 KB