From: Ralf Baechle <ralf@linux-mips.org>
To: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
linux-mips@linux-mips.org
Subject: Re: RFC: [MIPS] BCM1480/BCM1480HT remove io_offset
Date: Thu, 25 Feb 2010 15:05:22 +0100 [thread overview]
Message-ID: <20100225140522.GA467@linux-mips.org> (raw)
In-Reply-To: <1267069502.8811.7.camel@dc7800.home>
On Wed, Feb 24, 2010 at 08:45:02PM -0700, Bjorn Helgaas wrote:
> Actually, you should be able to make this work with CPU I/O resources of
> your choice even if you can't control the translation. It just requires
> a little more indirection, like most computer science problems :-) On
> ia64, we map multiple I/O port spaces with arbitrary translations into a
> 0xSPPPPPP scheme (S = space number, PPPPPP = port number).
>
> But my main concern is just making sure that my IORESOURCE_PCI_FIXED
> change didn't break BCM1480, and I don't think it will.
The whole IORESOURCE_PCI_FIXED thing was created for Cobalt only and is
needed due to the discontinuity of the port address space with legacy I/O
ports in the range of 0..0x1000 and the rest starting off from 0x10000000.
No other system has such a lobotomized system controller.
Ralf
prev parent reply other threads:[~2010-02-25 14:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-24 20:38 RFC: [MIPS] BCM1480/BCM1480HT remove io_offset Bjorn Helgaas
2010-02-24 22:10 ` Thomas Bogendoerfer
2010-02-24 23:30 ` Bjorn Helgaas
2010-02-25 3:45 ` Bjorn Helgaas
2010-02-25 14:05 ` Ralf Baechle [this message]
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