From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: "Steven J. Hill" <sjhill@realitydiluted.com>
Cc: linuxppc-dev list <linuxppc-dev@lists.linuxppc.org>
Subject: Re: 750 and Discovery II coherency with PCI....
Date: Wed, 04 Aug 2004 10:42:44 +1000 [thread overview]
Message-ID: <1091580163.1922.39.camel@gaston> (raw)
In-Reply-To: <410F05EC.1040405@realitydiluted.com>
On Tue, 2004-08-03 at 13:26, Steven J. Hill wrote:
> Greetings.
>
> I am writing a device driver for a PMC card that is nothing
> fancy. It is not a PCI-X card though. My Linux driver properly
> detects the device, 'ioremaps' the PCI IO and MEM regions then
> attempts to start writing the devices registers for setup
> and configuration. I am not getting valid reads and there
> appears to be some coherency issues. I have verified that no
> other drivers or resources in the system are utilizing the
> addresses that are returned to me from 'ioremap'. I have the
> following code snippet:
There is no coherency issues with non cacheable (ioremap'ed)
access of that kind... Note that if you are dealing with IO space,
then you should use inX/outX accessors and not ioremap.
Ben.
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
prev parent reply other threads:[~2004-08-04 0:42 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-03 3:26 750 and Discovery II coherency with PCI Steven J. Hill
2004-08-03 11:56 ` Brian Waite
2004-08-03 17:23 ` Mark A. Greer
2004-08-04 0:42 ` Benjamin Herrenschmidt [this message]
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