From: Peter Korsgaard <jacmet@sunsite.dk>
To: linas@austin.ibm.com (Linas Vepstas)
Cc: linuxppc-dev@ozlabs.org, Paul Mackerras <paulus@samba.org>,
sfr@canb.auug.org.au
Subject: Re: Recently removed io accessors
Date: Mon, 16 Oct 2006 20:54:10 +0200 [thread overview]
Message-ID: <87vemk6qi5.fsf@sleipner.barco.com> (raw)
In-Reply-To: <20061016165140.GB6537@austin.ibm.com> (Linas Vepstas's message of "Mon, 16 Oct 2006 11:51:40 -0500")
>>>>> "LV" == Linas Vepstas <linas@austin.ibm.com> writes:
Hi,
>> It doesn't have to be readw (16bit accesses). Enabling the BE mode
>> and using _outsl/_insl (32bit access with byteswap) works fine.
LV> I think Paul was trrying to say that it might be easier just to
LV> 16-bit words. Are you trying to use 32-bit access due to
LV> performance concerns?
Yes, this is the hot path of the driver as I don't have DMA hardware
(copy to/from packet buffer).
Another reason is that the same driver is used for the entire 911x
series, some which have an 16bit interface and others with full 32bit.
--
Bye, Peter Korsgaard
prev parent reply other threads:[~2006-10-16 18:54 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-12 15:44 Recently removed io accessors Peter Korsgaard
2006-10-13 0:04 ` Benjamin Herrenschmidt
2006-10-13 6:56 ` Peter Korsgaard
2006-10-13 7:31 ` Benjamin Herrenschmidt
2006-10-13 8:43 ` Peter Korsgaard
2006-10-13 9:30 ` Benjamin Herrenschmidt
2006-10-13 9:55 ` Peter Korsgaard
2006-10-13 12:18 ` Benjamin Herrenschmidt
2006-10-13 12:38 ` Peter Korsgaard
2006-10-13 23:20 ` Paul Mackerras
2006-10-14 11:57 ` Peter Korsgaard
2006-10-16 16:51 ` Linas Vepstas
2006-10-16 18:54 ` Peter Korsgaard [this message]
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