• Lennert Buytenhek's avatar
    [ARM] kirkwood: fix PCI I/O port assignment · 35f029e2
    Lennert Buytenhek authored
    Instead of allocating PCI devices I/O port bus addresses from the
    000xxxxx I/O port range as intended, due to a bus versus physical
    address mixup, the Kirkwood PCIe handling code inadvertently
    allocated I/O port bus addresses from the f20xxxxx address range
    (which is the physical address range of the PCIe I/O mapping window),
    but then direct all I/O port accesses to bus addresses 000xxxxx,
    which would then not be decoded at all.
    
    Fix this by setting the base address of the PCIe I/O space struct
    resource to KIRKWOOD_PCIE_IO_BUS_BASE instead of the incorrect
    KIRKWOOD_PCIE_IO_PHYS_BASE, and fix up __io() to expect addresses
    offsetted by the former instead of the latter.
    
    (The suggested fix of directing I/O port accesses from the host to
    bus addresses f20xxxxx instead has the problem that assigning full
    32bit I/O port bus addresses (f20xxxxx) doesn't work on all PCI
    devices, as not all PCI devices implement full 32 bit BAR registers
    for I/O ports.  We should really try to allocate I/O port bus
    addresses that fit in 16 bits.)
    Signed-off-by: default avatarLennert Buytenhek <buytenh@marvell.com>
    Signed-off-by: default avatarNicolas Pitre <nico@marvell.com>
    35f029e2
io.h 1.3 KB