From: Grant Likely <grant.likely@secretlab.ca>
To: Eddie Dawydiuk <eddie@embeddedarm.com>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: PowerPC iotable_init equivalent?
Date: Fri, 17 Apr 2009 23:42:55 -0600 [thread overview]
Message-ID: <fa686aa40904172242w378fd4c8n1a4f68d897af2859@mail.gmail.com> (raw)
In-Reply-To: <49E8F2D7.3050603@embeddedarm.com>
On Fri, Apr 17, 2009 at 3:21 PM, Eddie Dawydiuk <eddie@embeddedarm.com> wrote:
> Hello,
>
> In the past I've worked with ARM architectures where I could setup virtual /
> physical address mappings so I don't have to ioremap then pass around
> pointers. Does PowerPC have an equivalent abstraction? If not whats the
> recommended approach?
No. Predefining virt->phys mappings is fragile since it makes
assumptions about how the kernel is going to carve up the virtual
address space. Better to let the kernel allocate virtual ranges as it
needs them.
As Kumar says, do your ioremap() (or, even better: of_iomap()) in your
driver's probe function and store it in the driver's private data
structure.
g.
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
prev parent reply other threads:[~2009-04-18 5:43 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-17 21:21 PowerPC iotable_init equivalent? Eddie Dawydiuk
2009-04-17 21:31 ` Roderick Colenbrander
2009-04-17 21:32 ` Kumar Gala
2009-04-18 5:42 ` Grant Likely [this message]
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