From: Paul Mundt <lethal@linux-sh.org>
To: linux-sh@vger.kernel.org
Subject: Re: [PATCH] sh: P4 ioremap pass-through
Date: Tue, 25 Nov 2008 13:18:52 +0000 [thread overview]
Message-ID: <20081125131852.GC20883@linux-sh.org> (raw)
In-Reply-To: <20081125125729.8565.28530.sendpatchset@rx1.opensource.se>
On Tue, Nov 25, 2008 at 09:57:29PM +0900, Magnus Damm wrote:
> From: Magnus Damm <damm@igel.co.jp>
>
> This patch adds a pass-through case when ioremapping P4 addresses.
>
> Addresses passed to ioremap() should be physical addresses, so the
> best option is usually to convert the virtual address to a physical
> address before calling ioremap. This will give you a virtual address
> in P2 which matches the physical address and this works well for
> most internal hardware blocks on the SuperH architecture.
>
> However, some hardware blocks must be accessed through P4. Converting
> the P4 address to a physical and then back to a P2 does not work. One
> example of this is the sh7722 TMU block, it must be accessed through P4.
>
> Without this patch P4 addresses will be mapped using PTEs which
> requires the page allocator to be up and running.
>
> Signed-off-by: Magnus Damm <damm@igel.co.jp>
Applied, thanks.
prev parent reply other threads:[~2008-11-25 13:18 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-25 12:57 [PATCH] sh: P4 ioremap pass-through Magnus Damm
2008-11-25 13:18 ` Paul Mundt [this message]
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