Messages in this thread | | | Date | Sat, 19 Feb 2022 12:34:45 +0100 | From | Marek Behún <> | Subject | Re: [PATCH] arm64: dts: marvell: armada-37xx: Remap IO space to bus address 0x0 |
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On Fri, 18 Feb 2022 22:25:26 +0100 Pali Rohár <pali@kernel.org> wrote:
> Remap PCI I/O space to the bus address 0x0 in the Armada 37xx > device-tree in order to support legacy I/O port based cards which have > hardcoded I/O ports in low address space. > > Some legacy PCI I/O based cards do not support 32-bit I/O addressing. > > Since commit 64f160e19e92 ("PCI: aardvark: Configure PCIe resources from > 'ranges' DT property") this driver can work with I/O windows which have > a different address for CPU than for PCI bus (unless there is some > conflict with other A37xx mapping), without needing additional support > for this in the firmware. > > Note that DDR on A37xx is mapped to bus address 0x0 and that mapping of > I/O space can be set to address 0x0 too because MEM space and I/O space > are separate and so they do not conflict. > > Signed-off-by: Pali Rohár <pali@kernel.org> > Reported-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Marek Behún <kabel@kernel.org>
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