From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Jeff Garzik <jgarzik@mandrakesoft.com>
Cc: <linuxppc-dev@lists.linuxppc.org>, <linux-kernel@vger.kernel.org>
Subject: Re: The IO problem on multiple PCI busses
Date: Sat, 3 Mar 2001 18:28:08 +0100 [thread overview]
Message-ID: <19350126105952.7554@smtp.wanadoo.fr> (raw)
In-Reply-To: <3AA0CF0D.CB9D544C@mandrakesoft.com>
In-Reply-To: <3AA0CF0D.CB9D544C@mandrakesoft.com>
>I/O is not supposed to be fast, that's what MMIO is for. :) Just do
>
>void outb (u8 val, u16 addr)
>{
> void *addr = ioremap (ISA_IO_BASE + addr);
> if (addr) {
> writeb (val, addr);
> iounmap (addr);
> }
>}
>
>You can map and unmap for each call :) Ugly and slow, but hey, it's
>I/O...
Well, that would really suck ;) And I don't think it would be necessary
as we can probably limit each IO bus to 64k without much problem, and
have them permanently ioremap'ed.
Ben.
next prev parent reply other threads:[~2001-03-03 17:29 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-03-01 15:33 Benjamin Herrenschmidt
2001-03-01 15:41 ` Benjamin Herrenschmidt
2001-03-01 18:30 ` Alan Cox
2001-03-01 19:09 ` David S. Miller
2001-03-01 19:33 ` Dan Malek
2001-03-01 19:41 ` David S. Miller
2001-03-01 19:59 ` Dan Malek
2001-03-01 20:09 ` Benjamin Herrenschmidt
2001-03-01 20:22 ` David S. Miller
2001-03-01 20:27 ` David S. Miller
2001-03-02 11:25 ` Benjamin Herrenschmidt
2001-03-03 1:08 ` David S. Miller
2001-03-01 19:49 ` Benjamin Herrenschmidt
2001-03-01 20:21 ` David S. Miller
2001-03-01 22:26 ` Alan Cox
2001-03-02 11:20 ` Benjamin Herrenschmidt
2001-03-03 1:06 ` David S. Miller
2001-03-03 2:25 ` Benjamin Herrenschmidt
2001-03-03 11:01 ` Jeff Garzik
2001-03-03 17:28 ` Benjamin Herrenschmidt [this message]
2001-03-05 16:20 ` David Woodhouse
2001-03-06 23:01 ` Oliver Xymoron
2001-03-07 2:07 ` Tony Mantler
2001-03-05 23:21 ` Chris Wedgwood
2001-03-02 1:22 Grant Grundler
2001-03-02 2:19 ` David S. Miller
2001-03-02 17:46 ` Grant Grundler
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