PCI DMA - Where to specify destination address (IO address)

[munees waran <munees40@xxxxxxxxxxx>]

Hi,

 

I am writing PCI device driver in linux, where I need to do DMA operation.

 

While transferring data from memory to IO or IO to memory, only source address is specified in API call. How destination address will be specified ?

 

int dad_dma_prepare(int channel, int mode, unsigned int buf,

unsigned int count)

{

unsigned long flags;

flags = claim_dma_lock( );

disable_dma(channel);

clear_dma_ff(channel);

set_dma_mode(channel, mode);

set_dma_addr(channel, virt_to_bus(buf));

set_dma_count(channel, count);

enable_dma(channel);

release_dma_lock(flags);

return 0;

}

 

Please help me.

 

Thanks & Regards,

Munees.

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