• Vineet Gupta's avatar
    ARCv2: intc: untangle SMP, MCIP and IDU · 3ce0fefc
    Vineet Gupta authored
    The IDU intc is technically part of MCIP (Multi-core IP) hence
    historically was only available in a SMP hardware build (and thus only
    in a SMP kernel build). Now that hardware restriction has been lifted,
    so a UP kernel needs to support it.
    
    This requires breaking mcip.c into parts which are strictly SMP
    (inter-core interrupts) and IDU which in reality is just another
    intc and thus has no bearing on SMP.
    
    This change allows IDU in UP builds and with a suitable device tree, we
    can have the cascaded intc system
    
        ARCv2 core intc <---> ARCv2 IDU intc <---> periperals
    Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
    3ce0fefc
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