linux-kernel - Re: [PATCH v3] arm64: dts: marvell: armada-37xx: Remap IO space to bus address 0x0

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Message-ID: <CAK8P3a1jz1gJe-Xd08bWBByqpoPrVNDmfi5uK+t8XZTCBRCGxQ@mail.gmail.com>
Date:   Thu, 10 Mar 2022 12:51:00 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Pali Rohár <pali@...nel.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Marek Behún <kabel@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] arm64: dts: marvell: armada-37xx: Remap IO space to
 bus address 0x0

On Thu, Mar 10, 2022 at 11:39 AM Pali Rohár <pali@...nel.org> wrote:
>
> Legacy and old 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") kernel can set different PCIe address on CPU and
> different on the bus for the one A37xx address mapping without any firmware
> support in case the bus address does not conflict with other A37xx mapping.
>
> So remap I/O space to the bus address 0x0 to enable support for old legacy
> I/O port based cards which have hardcoded I/O ports in low address space.
>
> Note that DDR on A37xx is mapped to bus address 0x0. And mapping of I/O
> space can be set to address 0x0 too because MEM space and I/O space are
> separate and so do not conflict.
>
> Remapping IO space on Turris Mox to different address is not possible to
> due bootloader bug.
>
> Signed-off-by: Pali Rohár <pali@...nel.org>
> Reported-by: Arnd Bergmann <arnd@...db.de>
> Fixes: 76f6386b25cc ("arm64: dts: marvell: Add Aardvark PCIe support for Armada 3700")
> Cc: stable@...r.kernel.org # 64f160e19e92 ("PCI: aardvark: Configure PCIe resources from 'ranges' DT property")
> Cc: stable@...r.kernel.org # 514ef1e62d65 ("arm64: dts: marvell: armada-37xx: Extend PCIe MEM space")

Reviewed-by: Arnd Bergmann <arnd@...db.de>