pci: Fix ioport allocation size
The PCI Local Bus Specification, Rev. 3.0,
Section 6.2.5.1. "Address Maps" states:
"Devices that map control functions into I/O Space must not consume more
than 256 bytes per I/O Base Address register."
Yet all the PCI devices allocate IO ports of IOPORT_SIZE (= 1024 bytes).
Fix this by having PCI devices use 256 bytes ports for IO BARs.
There is no hard requirement on the size of the memory region described
by memory BARs. Since BAR 1 is supposed to offer the same functionality as
IO ports, let's make its size match BAR 0.
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Julien Thierry <julien.thierry@arm.com>
[Added rationale for changing BAR1 size to PCI_IO_SIZE]
Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
4 files changed
