Re: PCI DMA concepts ??
From: Heeyong (heeyong.park_at_samsung.com)
Date: 10/14/04
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Date: 13 Oct 2004 17:58:04 -0700
Hi there,
I don't think normal PCI cards do the DMA instead of burst transfer.
Please check out the PCI book for burst transfer.
I recommend "PCI System Architecture" by mindShare, Inc.
Good luck,
Heeyong.
saravanan_sprt@rediffmail.com (Chanemou) wrote in message news:<d09cbbf7.0410070554.2507f6d5@posting.google.com>...
> Hi everybody.
>
> I am having some doubts with a driver for a PCI card.I learned
> how to read/write configuration and map memory to kernel space but
> confused in using how to do dma read & write.
>
> 1. The pci card has built in PCI & DMA controller.
> DMA controller registers (READ and WRITE registers) can be
> programmed by specifying (PCI_ADDRESS, LOCAL_SDRAM_ADDRESS,
> SIZE).(These registers are memory mapped via BAR3 and can be
> programmed by host system or by the Local card.)
>
> 2. on the host side I have done DMA alloc (say for 5MB )using
> HalAllocateCommonBuffer() and also created dummy ISR to perform
> Receive from the pci card.
>
> 3. for Transmitting data to the pci card , I think that I can program
> the DMA registers that are memory mapped into host side. so that the
> DMA controller does the Transfer. and generate interrupt ot host upon
> completion. Is this a correct way?
>
> 4. for Receiving from the Pci card, the card generate interrupt to the
> host after DMA transfer from pci to host memory by programming the DMA
> registers from the loca side.
>
> cld u explain for dma read and write sequence so that it wld
> be helpful for me in step a head.
>
> 5. I created a large DMA bufffer for DMA Xfer. how Read and Write use
> this buffer. or I have to allocate DMA buffer for Tx and Rx on the
> host side.
>
> 6. ReadFile and WriteFile API are meant for DMA or what? if so how
> this is performed? then whats the use of DMA controller registers on
> the pci card.?
>
> these are my few questions which really confuses me.cld u pls
> answer these questions so that it wld be helpful in proceeding
> furthur.
>
> thanks
>
> chanemou
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