From: Jeff Garzik <jeff@garzik.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Linux IDE <linux-ide@vger.kernel.org>
Subject: Re: [PATCH] libata: Add MMIO support to pata_sil680
Date: Thu, 24 May 2007 20:51:26 -0400 [thread overview]
Message-ID: <4656330E.2000604@garzik.org> (raw)
In-Reply-To: <20070525014027.3feabe50@the-village.bc.nu>
Alan Cox wrote:
>> #define DELAY400NS { pio_inbyte( CB_ASTAT ); pio_inbyte( CB_ASTAT ); \
>> pio_inbyte( CB_ASTAT ); pio_inbyte( CB_ASTAT ); }
>>
>>
>
> Totally unrelated. Hal is using the cycle time of the four I/O reads to
> do the 400nS delay. Its a neat way to do the delay on boxes without
> modern CPUs and nice timing features and perhaps one we should use on
> those boxes but its not relevant to the question of how you post an MMIO
> command write.
It illustrates (as well as our experience to date) that AltStatus use
for the delay is just fine.
Jeff
next prev parent reply other threads:[~2007-05-25 0:51 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-15 6:12 [PATCH] libata: Add MMIO support to pata_sil680 Benjamin Herrenschmidt
2007-05-15 6:14 ` Benjamin Herrenschmidt
2007-05-23 13:42 ` Alan Cox
2007-05-23 22:48 ` Benjamin Herrenschmidt
2007-05-23 23:31 ` Alan Cox
2007-05-23 23:43 ` Benjamin Herrenschmidt
2007-05-24 0:13 ` Alan Cox
2007-05-24 3:42 ` Benjamin Herrenschmidt
2007-05-24 9:54 ` Alan Cox
2007-05-24 10:52 ` Jeff Garzik
2007-05-24 11:09 ` Alan Cox
2007-05-24 11:09 ` Jeff Garzik
2007-05-25 0:29 ` Jeff Garzik
2007-05-25 0:40 ` Alan Cox
2007-05-25 0:51 ` Jeff Garzik [this message]
2007-05-25 14:20 ` Alan Cox
2007-05-28 2:21 ` Jeff Garzik
2007-05-24 6:02 ` Jeff Garzik
2007-05-24 9:33 ` Alan Cox
2007-05-24 9:55 ` Jeff Garzik
2007-05-24 10:08 ` Benjamin Herrenschmidt
2007-05-24 20:56 ` Mark Lord
2007-05-24 22:52 ` Benjamin Herrenschmidt
2007-05-25 11:32 ` Mark Lord
2007-05-24 10:06 ` Benjamin Herrenschmidt
-- strict thread matches above, loose matches on Subject: below --
2007-05-16 0:21 Benjamin Herrenschmidt
2007-05-16 12:05 ` Alan Cox
2007-05-16 12:12 ` Benjamin Herrenschmidt
2007-05-18 1:00 ` Jeff Garzik
2007-05-15 6:11 Benjamin Herrenschmidt
2007-05-15 6:14 ` Benjamin Herrenschmidt
2007-05-15 11:08 ` Alan Cox
2007-05-15 20:32 ` Benjamin Herrenschmidt
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