a question of mpc8313, maybe simple

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.
And , i did not find any words about DMA in mpc8313erdb.dts .
So 
1. please tell me what should be the parameter IRQ?
      Is it the irq requested when DMA initialized or another one?
2. If i want initialize DMA, how should i do with mpc8313erdb.dts?


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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

Thanks a lot for answer my question.
But i am newhand and not very clear about it.
Do you mean:
1. in this case i do not need to include DMA when i "make menuconfig" ?
        The path is Device Drivers->DMA.
2. in this case i do not need add any DMA information in mpc8313erdb.dts?

Now i am reading PCI driver in kernel 2.6.20 to catch your meaning.


Scott Wood-2 wrote:

On Mon, Jun 23, 2008 at 05:48:07AM -0700, jumpingProgrammer wrote:

quoted

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.

quoted

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
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On Mon, Jun 23, 2008 at 06:13:41PM -0700, jumpingProgrammer wrote:

Thanks a lot for answer my question.
But i am newhand and not very clear about it.
Do you mean:
1. in this case i do not need to include DMA when i "make menuconfig" ?
        The path is Device Drivers->DMA.

Right, that's for independent DMA engines, such as for offloading
memory-to-memory copies.

2. in this case i do not need add any DMA information in mpc8313erdb.dts?

Right.

-Scott