• Andrew Bresticker's avatar
    irqchip: mips-gic: Support local interrupts · e9de688d
    Andrew Bresticker authored
    The MIPS GIC supports 7 local interrupts, 2 of which are the GIC
    local watchdog and count/compare timer.  The remainder are CPU
    interrupts which may optionally be re-routed through the GIC.
    GIC hardware IRQs 0-6 are now used for local interrupts while
    hardware IRQs 7+ are used for external (shared) interrupts.
    
    Note that the 5 CPU interrupts may not be re-routable through
    the GIC.  In that case mapping will fail and the vectors reported
    in C0_IntCtl should be used instead.  gic_get_c0_compare_int() and
    gic_get_c0_perfcount_int() will return the correct IRQ number to
    use for the C0 timer and perfcounter interrupts based on the
    routability of those interrupts through the GIC.
    
    A separate irq_chip, with callbacks that mask/unmask the local
    interrupt on all CPUs, is used for the C0 timer and performance
    counter interrupts since all other platforms do not use the percpu
    IRQ API for those interrupts.
    
    Malta, SEAD-3, and the GIC clockevent driver have been updated
    to use local interrupts and the R4K clockevent driver has been
    updated to poll for C0 timer interrupts through the GIC when
    the GIC is present.
    Signed-off-by: default avatarAndrew Bresticker <abrestic@chromium.org>
    Acked-by: default avatarJason Cooper <jason@lakedaemon.net>
    Reviewed-by: default avatarQais Yousef <qais.yousef@imgtec.com>
    Tested-by: default avatarQais Yousef <qais.yousef@imgtec.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Jeffrey Deans <jeffrey.deans@imgtec.com>
    Cc: Markos Chandras <markos.chandras@imgtec.com>
    Cc: Paul Burton <paul.burton@imgtec.com>
    Cc: Jonas Gorski <jogo@openwrt.org>
    Cc: John Crispin <blogic@openwrt.org>
    Cc: David Daney <ddaney.cavm@gmail.com>
    Cc: linux-mips@linux-mips.org
    Cc: linux-kernel@vger.kernel.org
    Patchwork: https://patchwork.linux-mips.org/patch/7819/Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
    e9de688d
cevt-r4k.c 4.84 KB