From: Arnd Bergmann <arnd@arndb.de>
To: "Marek Behún" <kabel@kernel.org>
Cc: "Pali Rohár" <pali@kernel.org>, "Andrew Lunn" <andrew@lunn.ch>,
"Gregory Clement" <gregory.clement@bootlin.com>,
"Linux ARM" <linux-arm-kernel@lists.infradead.org>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] arm64: dts: marvell: armada-37xx: Remap IO space to bus address 0x0
Date: Sat, 19 Feb 2022 22:00:23 +0100 [thread overview]
Message-ID: <CAK8P3a2VW1zFAVqfBGucL2qpnQWsih457Dg8iFE3nR=Zrp+iSQ@mail.gmail.com> (raw)
In-Reply-To: <20220219123445.14940a12@thinkpad>
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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next prev parent reply other threads:[~2022-02-19 21:02 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-18 21:25 [PATCH] arm64: dts: marvell: armada-37xx: Remap IO space to bus address 0x0 Pali Rohár
2022-02-19 11:34 ` Marek Behún
2022-02-19 21:00 ` Arnd Bergmann [this message]
2022-02-28 15:41 ` Gregory CLEMENT
2022-02-28 16:42 ` Gregory CLEMENT
2022-03-01 9:25 ` Pali Rohár
2022-03-02 13:06 ` Andrew Lunn
2022-03-02 13:15 ` Marek Behún
2022-03-02 13:25 ` Marek Behún
2022-03-02 13:25 ` Pali Rohár
2022-03-04 12:44 ` Pali Rohár
2022-03-04 16:30 ` [PATCH v2] " Pali Rohár
2022-03-08 11:41 ` Pali Rohár
2022-03-10 10:05 ` Gregory CLEMENT
2022-03-10 10:09 ` Pali Rohár
2022-03-10 10:22 ` Arnd Bergmann
2022-03-10 10:41 ` Pali Rohár
2022-03-10 10:23 ` Gregory CLEMENT
2022-03-10 10:47 ` Pali Rohár
2022-03-10 10:39 ` [PATCH v3] " Pali Rohár
2022-03-10 11:51 ` Arnd Bergmann
2022-03-10 13:51 ` Gregory CLEMENT
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