From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Michael Neuling <mikey@neuling.org>
Cc: mikey@neuling.org, linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
Subject: Re: powerpc/powernv: Fix XSCOM address mangling for form 1 indirect
Date: Fri, 31 Mar 2017 23:33:57 +1100 (AEDT) [thread overview]
Message-ID: <3vvgsd5YSDz9s03@ozlabs.org> (raw)
In-Reply-To: <1490319797.28113.46.camel@neuling.org>
On Fri, 2017-03-24 at 01:43:17 UTC, Michael Neuling wrote:
> POWER9 adds form 1 scoms. The form of the indirection is specified in
> the top nibble of the scom address.
>
> Currently we do some (ugly) bit mangling so that we can fit a 64 bit
> scom address into the debugfs interface. The current code only shifts
> the top bit (indirect bit).
>
> This patch changes it to shift the whole top nibble so that the form
> of the indirection is also shifted.
>
> This patch is backwards compatible with older scoms.
>
> (This change isn't required in the
> arch/powerpc/platformspowernv/opal-prd.c scom interface as it passes
> the whole 64bit scom address without any bit mangling)
>
> Signed-off-by: Michael Neuling <mikey@neuling.org>
Applied to powerpc next, thanks.
https://git.kernel.org/powerpc/c/517c27570cf38f182e7a688d50a9b9
cheers
prev parent reply other threads:[~2017-03-31 12:33 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-24 1:43 [PATCH] powerpc/powernv: Fix XSCOM address mangling for form 1 indirect Michael Neuling
2017-03-31 12:33 ` Michael Ellerman [this message]
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