Hi guys, I have tried these calls to covert part of my DMA address to Virtual and it seems to work fine. I am curious to know more about these calls.
dma_map_single(NULL, dev->buf_addr, tx_cnt, DMA_TO_DEVICE)); dma_map_single(NULL, dev->buf_addr, tx_cnt, DMA_FROM_DEVICE)); The reason I am suspect these calls is: I allocated a single DMA memory of 4K bytes size. No I want to split and distribute the so allocated buffer between each device. in that case of my starting address is ADDR. the address I submit to the device would be something like ADDR + 32* device_num. But, I realize that it is not actually returning the Virtual address. Regards, Adams On Tue, Sep 16, 2008 at 3:37 PM, bhanu jampala <[EMAIL PROTECTED]> wrote: > Hi All, > > How do I convert a DMA buffer to virtual address on Linux PPC? > > I know there is some thing like dma_to_virt(), but I don't think if there > is one for PPC. > In this scenario where I have submitted some dma buffer form a chunk of > memory to Device. > Now at the end of successful receive, how do I convert it back to Virtual > address? > Any pointers? > > > >
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