linux-kernel - RE: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for special ISA

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Message-ID: <EE11001F9E5DDD47B7634E2F8A612F2E1F8F229A@lhreml507-mbx>
Date:   Wed, 9 Nov 2016 14:51:01 +0000
From:   Gabriele Paoloni <gabriele.paoloni@...wei.com>
To:     One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
        Arnd Bergmann <arnd@...db.de>
CC:     Mark Rutland <mark.rutland@....com>,
        Yuanzhichang <yuanzhichang@...ilicon.com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "olof@...om.net" <olof@...om.net>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linuxarm <linuxarm@...wei.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "minyard@....org" <minyard@....org>,
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        "zourongrong@...il.com" <zourongrong@...il.com>,
        John Garry <john.garry@...wei.com>,
        "zhichang.yuan02@...il.com" <zhichang.yuan02@...il.com>,
        "kantyzc@....com" <kantyzc@....com>,
        "xuwei (O)" <xuwei5@...ilicon.com>,
        "marc.zyngier@....com" <marc.zyngier@....com>
Subject: RE: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for
 special ISA

> -----Original Message-----
> From: One Thousand Gnomes [mailto:gnomes@...rguk.ukuu.org.uk]
> Sent: 09 November 2016 13:55
> To: Arnd Bergmann
> Cc: Mark Rutland; Yuanzhichang; catalin.marinas@....com;
> will.deacon@....com; robh+dt@...nel.org; bhelgaas@...gle.com;
> olof@...om.net; linux-arm-kernel@...ts.infradead.org;
> lorenzo.pieralisi@....com; linux-kernel@...r.kernel.org; Linuxarm;
> devicetree@...r.kernel.org; linux-pci@...r.kernel.org; linux-
> serial@...r.kernel.org; minyard@....org; benh@...nel.crashing.org;
> liviu.dudau@....com; zourongrong@...il.com; John Garry; Gabriele
> Paoloni; zhichang.yuan02@...il.com; kantyzc@....com; xuwei (O);
> marc.zyngier@....com
> Subject: Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for
> special ISA
> 
> > I think it is a relatively safe assumption that there is only one
> > ISA bridge. A lot of old drivers hardcode PIO or memory addresses
> 
> It's not a safe assumption for x86 at least. There are a few systems
> with
> multiple ISA busses particularly older laptops with a docking station.

Mmmm right...now the point is that this kind of special devices appearing
as a special ISA bus will probably never appear on x86 platforms (I guess).

So maybe it is a safe assumption because of this...?

Thanks

Gab

> 
> > when talking to an ISA device, so having multiple instances is
> > already problematic.
> 
> PCMCIA devices handle it themselves so are ok. I'm not clear how the
> dual
> PIIX4 configuration used in the older IBM laptop docks actually worked
> so
> I assume the transaction went out of both bridges and providing one of
> them responded the other kept silent as you simply stuffed the card
> into
> the dock and it worked.
> 
> Alan