From: Scott Wood <scottwood@freescale.com>
To: jumpingProgrammer <rabbitzp@163.com>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: a question of mpc8313, maybe simple
Date: Mon, 23 Jun 2008 12:09:56 -0500 [thread overview]
Message-ID: <20080623170956.GA6978@loki.buserror.net> (raw)
In-Reply-To: <18067094.post@talk.nabble.com>
On Mon, Jun 23, 2008 at 05:48:07AM -0700, jumpingProgrammer wrote:
> i am working with a board of mpc8313 using default mpc8313erdb.dts.
> But i do not know how can i correctly use DMA to transport data from memory
> to a PCI device.
> i tryed this
> {
> .....
> request_irq(IRQ,....);
> request_dma(.....);
> ....
> }
>
> In request_irq() , i do not know what is the parameter IRQ.
Use pci_dev->irq.
> And , i did not find any words about DMA in mpc8313erdb.dts .
PCI devices can do bus-mastering DMA themselves; request_dma() is for ISA
devices.
-Scott
next prev parent reply other threads:[~2008-06-23 17:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-23 12:48 a question of mpc8313, maybe simple jumpingProgrammer
2008-06-23 17:09 ` Scott Wood [this message]
2008-06-24 1:13 ` jumpingProgrammer
2008-06-24 17:58 ` Scott Wood
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