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DMA transfer from IDE device (DVD-ROM)

Hi all,
 
I want to recieve data from a DVD-ROM via ATAPI - in DMA mode. The PIO mode is running perfectly, but I have no idea how to get data in DMA.
The only thing what I do is to set the Features register so, that the requested data comes in DMA mode. It is OK. But I have to poll the DMARQ pin, and read data until DMARQ is high. How can I do this? I don´t want to use the windows´driver, I want to do everything in LV.
 
regards
Mitulatbati
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