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Message-ID: <17255.13329.695936.607613@cargo.ozlabs.ibm.com>
Date: Tue, 1 Nov 2005 20:23:29 +1100
From: Paul Mackerras <paulus@samba.org>
To: Kylene Jo Hall <kjhall@us.ibm.com>
Cc: linux-kernel@vger.kernel.org, akpm@osdl.org, moilanen@austin.ibm.com
Subject: Re: [PATCH] tpm: support PPC64 hardware
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Kylene Jo Hall writes:

> The TPM is discovered differently on PPC64 because the device must be
> discovered through the device tree in order to open the proper holes in
> the io_page_mask for reading and writing in the low memory space.  This
> does not happen automatically like most devices because the tpm is not a
> normal pci device and lives under the root node.

Please just do an ioremap on the physical address and use
read[bwl]/write[bwl] or ioread{8,16,32}/iowrite{8,16,32}, or else
persuade the firmware developers to put the tpm in the right place in
the device tree.

Thanks,
Paul.
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