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Date: Mon, 23 Jun 2008 12:09:56 -0500
From: Scott Wood <scottwood@freescale.com>
To: jumpingProgrammer <rabbitzp@163.com>
Subject: Re: a question of mpc8313, maybe simple
Message-ID: <20080623170956.GA6978@loki.buserror.net>
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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