From: Pete Popov <ppopov@embeddedalley.com>
To: Gilad Rom <gilad@romat.com>
Cc: "Maciej W. Rozycki" <macro@linux-mips.org>, linux-mips@linux-mips.org
Subject: Re: CP0 EntryLo
Date: Tue, 30 Nov 2004 10:01:26 -0800 [thread overview]
Message-ID: <41ACB576.6000501@embeddedalley.com> (raw)
In-Reply-To: <Pine.LNX.4.58L.0411301635590.31151@blysk.ds.pg.gda.pl>
Maciej W. Rozycki wrote:
> On Tue, 30 Nov 2004, Gilad Rom wrote:
>
>
>>So, what I need to do, if I understand correctly, is to create a fixed
>>mapping
>>>From a virtual address to a physical address on the tlb, and use this
>>Virtual address to change the values of EntryLo to 0xD in order to
>>Access the device on the address range I mapped Chip-select 1 to?
>>
>>(Excuse my poor phrasing, I've been googling all day...)
>>
>>Any idea on how I might accomplish that from a driver?
>>I've found a function called add_wired_entry(...), is this
>>What I should be using?
>
>
> ioremap()
Exactly. You program the CS with a physical address. Make sure that
address does not overlap with anything else. Then you call ioremap
from your driver and you get back a virtual address. You use that
virtual address to access the peripheral.
At this stage I would say that probably reading something like the
Linux Kernel book or Linux Device Drivers both by Oreilly will
really help you.
Pete
next prev parent reply other threads:[~2004-11-30 18:02 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-30 9:56 CP0 EntryLo Gilad Rom
2004-11-30 9:56 ` Gilad Rom
2004-11-30 10:24 ` Dominic Sweetman
2004-11-30 10:24 ` Dominic Sweetman
2004-11-30 16:26 ` Gilad Rom
2004-11-30 16:26 ` Gilad Rom
2004-11-30 16:37 ` Maciej W. Rozycki
2004-11-30 18:01 ` Pete Popov [this message]
2004-11-30 18:16 ` Gilad Rom
2004-11-30 18:16 ` Gilad Rom
2004-11-30 18:45 ` Pete Popov
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