• Gavin Shan's avatar
    PCI/hotplug: PowerPC PowerNV PCI hotplug driver · 66725152
    Gavin Shan authored
    This adds standalone driver to support PCI hotplug for PowerPC PowerNV
    platform that runs on top of skiboot firmware. The firmware identifies
    hotpluggable slots and marked their device tree node with proper
    "ibm,slot-pluggable" and "ibm,reset-by-firmware". The driver scans
    device tree nodes to create/register PCI hotplug slot accordingly.
    
    The PCI slots are organized in fashion of tree, which means one
    PCI slot might have parent PCI slot and parent PCI slot possibly
    contains multiple child PCI slots. At the plugging time, the parent
    PCI slot is populated before its children. The child PCI slots are
    removed before their parent PCI slot can be removed from the system.
    
    If the skiboot firmware doesn't support slot status retrieval, the PCI
    slot device node shouldn't have property "ibm,reset-by-firmware". In
    that case, none of valid PCI slots will be detected from device tree.
    The skiboot firmware doesn't export the capability to access attention
    LEDs yet and it's something for TBD.
    Signed-off-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
    Acked-by: default avatarBjorn Helgaas <bhelgaas@google.com>
    Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
    66725152
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