Messages in this thread | | | From | Arnd Bergmann <> | Date | Sat, 19 Feb 2022 22:00:23 +0100 | Subject | Re: [PATCH] arm64: dts: marvell: armada-37xx: Remap IO space to bus address 0x0 |
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On Sat, Feb 19, 2022 at 12:34 PM Marek Behún <kabel@kernel.org> wrote: > > 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>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
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